Pau Espin Pedrol | 732131d | 2018-01-25 17:23:09 +0100 | [diff] [blame] | 1 | /* |
Harald Welte | 632e843 | 2017-09-05 18:12:14 +0200 | [diff] [blame] | 2 | * OsmoGGSN - Gateway GPRS Support Node |
jjako | 0fe0df0 | 2004-09-17 11:30:40 +0000 | [diff] [blame] | 3 | * Copyright (C) 2002, 2003, 2004 Mondru AB. |
Harald Welte | 632e843 | 2017-09-05 18:12:14 +0200 | [diff] [blame] | 4 | * Copyright (C) 2010-2011, 2016-2017 Harald Welte <laforge@gnumonks.org> |
| 5 | * Copyright (C) 2015-2017 sysmocom - s.f.m.c. GmbH |
Pau Espin Pedrol | 732131d | 2018-01-25 17:23:09 +0100 | [diff] [blame] | 6 | * |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 7 | * The contents of this file may be used under the terms of the GNU |
| 8 | * General Public License Version 2, provided that the above copyright |
| 9 | * notice and this permission notice is included in all copies or |
| 10 | * substantial portions of the software. |
Pau Espin Pedrol | 732131d | 2018-01-25 17:23:09 +0100 | [diff] [blame] | 11 | * |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 12 | */ |
| 13 | |
| 14 | /* |
| 15 | * gtp.c: Contains all GTP functionality. Should be able to handle multiple |
Pau Espin Pedrol | 732131d | 2018-01-25 17:23:09 +0100 | [diff] [blame] | 16 | * tunnels in the same program. |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 17 | * |
| 18 | * TODO: |
| 19 | * - Do we need to handle fragmentation? |
| 20 | */ |
| 21 | |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 22 | #ifdef __linux__ |
| 23 | #define _GNU_SOURCE 1 |
| 24 | #endif |
| 25 | |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 26 | #include <osmocom/core/logging.h> |
| 27 | #include <osmocom/core/utils.h> |
Daniel Willmann | 6536376 | 2024-01-26 16:36:20 +0100 | [diff] [blame] | 28 | #include <osmocom/gsm/gsm48.h> |
| 29 | #include <osmocom/gsm/gsm23003.h> |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 30 | |
Holger Hans Peter Freyther | 5816bcf | 2014-04-04 11:43:09 +0200 | [diff] [blame] | 31 | #if defined(__FreeBSD__) |
| 32 | #include <sys/endian.h> |
| 33 | #endif |
| 34 | |
jjako | 0fe0df0 | 2004-09-17 11:30:40 +0000 | [diff] [blame] | 35 | #include "../config.h" |
| 36 | #ifdef HAVE_STDINT_H |
| 37 | #include <stdint.h> |
| 38 | #endif |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 39 | |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 40 | #include <stdio.h> |
| 41 | #include <stdarg.h> |
| 42 | #include <stdlib.h> |
| 43 | #include <sys/time.h> |
| 44 | #include <sys/types.h> |
| 45 | #include <sys/socket.h> |
| 46 | #include <netinet/in.h> |
| 47 | #include <arpa/inet.h> |
| 48 | #include <sys/stat.h> |
| 49 | #include <time.h> |
| 50 | #include <unistd.h> |
| 51 | #include <string.h> |
| 52 | #include <errno.h> |
| 53 | #include <fcntl.h> |
Alexander Huemer | db852a1 | 2015-11-06 20:59:01 +0100 | [diff] [blame] | 54 | #include <inttypes.h> |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 55 | |
| 56 | #include <arpa/inet.h> |
| 57 | |
jjako | bae2cd4 | 2004-01-09 12:04:39 +0000 | [diff] [blame] | 58 | /* #include <stdint.h> ISO C99 types */ |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 59 | |
| 60 | #include "pdp.h" |
| 61 | #include "gtp.h" |
| 62 | #include "gtpie.h" |
| 63 | #include "queue.h" |
| 64 | |
jjako | 1db1c81 | 2003-07-06 20:53:57 +0000 | [diff] [blame] | 65 | /* Error reporting functions */ |
| 66 | |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 67 | #define GTP_LOGPKG(pri, peer, pack, len, fmt, args...) \ |
| 68 | logp2(DLGTP, pri, __FILE__, __LINE__, 0, \ |
| 69 | "Packet from %s:%u, length: %d content: %s: " fmt, \ |
| 70 | inet_ntoa((peer)->sin_addr), htons((peer)->sin_port), \ |
| 71 | len, osmo_hexdump((const uint8_t *) pack, len), \ |
| 72 | ##args); |
jjako | 1db1c81 | 2003-07-06 20:53:57 +0000 | [diff] [blame] | 73 | |
Neels Hofmeyr | 9b09738 | 2015-10-12 14:00:19 +0200 | [diff] [blame] | 74 | #define LOGP_WITH_ADDR(ss, level, addr, fmt, args...) \ |
| 75 | LOGP(ss, level, "addr(%s:%d) " fmt, \ |
| 76 | inet_ntoa((addr).sin_addr), htons((addr).sin_port), \ |
| 77 | ##args); |
| 78 | |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 79 | /* API Functions */ |
| 80 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 81 | const char *gtp_version() |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 82 | { |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 83 | return VERSION; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 84 | } |
| 85 | |
Max | e661277 | 2018-01-11 18:25:37 +0100 | [diff] [blame] | 86 | const struct value_string gtp_type_names[] = { |
| 87 | { GTP_ECHO_REQ, "Echo Request" }, |
| 88 | { GTP_ECHO_RSP, "Echo Response" }, |
| 89 | { GTP_NOT_SUPPORTED, "Version Not Supported" }, |
| 90 | { GTP_ALIVE_REQ, "Node Alive Request" }, |
| 91 | { GTP_ALIVE_RSP, "Node Alive Response" }, |
| 92 | { GTP_REDIR_REQ, "Redirection Request" }, |
| 93 | { GTP_REDIR_RSP, "Redirection Response" }, |
| 94 | { GTP_CREATE_PDP_REQ, "Create PDP Context Request" }, |
| 95 | { GTP_CREATE_PDP_RSP, "Create PDP Context Response" }, |
| 96 | { GTP_UPDATE_PDP_REQ, "Update PDP Context Request" }, |
| 97 | { GTP_UPDATE_PDP_RSP, "Update PDP Context Response" }, |
| 98 | { GTP_DELETE_PDP_REQ, "Delete PDP Context Request" }, |
| 99 | { GTP_DELETE_PDP_RSP, "Delete PDP Context Response" }, |
| 100 | { GTP_ERROR, "Error Indication" }, |
| 101 | { GTP_PDU_NOT_REQ, "PDU Notification Request" }, |
| 102 | { GTP_PDU_NOT_RSP, "PDU Notification Response" }, |
| 103 | { GTP_PDU_NOT_REJ_REQ, "PDU Notification Reject Request" }, |
| 104 | { GTP_PDU_NOT_REJ_RSP, "PDU Notification Reject Response" }, |
| 105 | { GTP_SUPP_EXT_HEADER, "Supported Extension Headers Notification" }, |
| 106 | { GTP_SND_ROUTE_REQ, "Send Routeing Information for GPRS Request" }, |
| 107 | { GTP_SND_ROUTE_RSP, "Send Routeing Information for GPRS Response" }, |
| 108 | { GTP_FAILURE_REQ, "Failure Report Request" }, |
| 109 | { GTP_FAILURE_RSP, "Failure Report Response" }, |
| 110 | { GTP_MS_PRESENT_REQ, "Note MS GPRS Present Request" }, |
| 111 | { GTP_MS_PRESENT_RSP, "Note MS GPRS Present Response" }, |
| 112 | { GTP_IDEN_REQ, "Identification Request" }, |
| 113 | { GTP_IDEN_RSP, "Identification Response" }, |
| 114 | { GTP_SGSN_CONTEXT_REQ,"SGSN Context Request" }, |
| 115 | { GTP_SGSN_CONTEXT_RSP,"SGSN Context Response" }, |
| 116 | { GTP_SGSN_CONTEXT_ACK,"SGSN Context Acknowledge" }, |
| 117 | { GTP_FWD_RELOC_REQ, "Forward Relocation Request" }, |
| 118 | { GTP_FWD_RELOC_RSP, "Forward Relocation Response" }, |
| 119 | { GTP_FWD_RELOC_COMPL, "Forward Relocation Complete" }, |
| 120 | { GTP_RELOC_CANCEL_REQ,"Relocation Cancel Request" }, |
| 121 | { GTP_RELOC_CANCEL_RSP,"Relocation Cancel Response" }, |
| 122 | { GTP_FWD_SRNS, "Forward SRNS Context" }, |
| 123 | { GTP_FWD_RELOC_ACK, "Forward Relocation Complete Acknowledge" }, |
| 124 | { GTP_FWD_SRNS_ACK, "Forward SRNS Context Acknowledge" }, |
| 125 | { GTP_DATA_TRAN_REQ, "Data Record Transfer Request" }, |
| 126 | { GTP_DATA_TRAN_RSP, "Data Record Transfer Response" }, |
| 127 | { GTP_GPDU, "G-PDU" }, |
| 128 | { 0, NULL } |
| 129 | }; |
| 130 | |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 131 | |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 132 | |
Pau Espin Pedrol | b5f9334 | 2018-07-23 11:24:07 +0200 | [diff] [blame] | 133 | static void emit_cb_recovery(struct gsn_t *gsn, struct sockaddr_in * peer, |
| 134 | struct pdp_t * pdp, uint8_t recovery) |
| 135 | { |
| 136 | if (gsn->cb_recovery) |
| 137 | gsn->cb_recovery(peer, recovery); |
| 138 | if (gsn->cb_recovery2) |
| 139 | gsn->cb_recovery2(peer, pdp, recovery); |
Pau Espin Pedrol | 5d8b226 | 2019-08-22 15:00:00 +0200 | [diff] [blame] | 140 | if (gsn->cb_recovery3) |
| 141 | gsn->cb_recovery3(gsn, peer, pdp, recovery); |
Pau Espin Pedrol | b5f9334 | 2018-07-23 11:24:07 +0200 | [diff] [blame] | 142 | } |
| 143 | |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 144 | /** |
| 145 | * get_default_gtp() |
| 146 | * Generate a GPRS Tunneling Protocol signalling packet header, depending |
| 147 | * on GTP version and message type. pdp is used for teid/flow label. |
| 148 | * *packet must be allocated by the calling function, and be large enough |
| 149 | * to hold the packet header. |
| 150 | * returns the length of the header. 0 on error. |
| 151 | **/ |
Pau Espin Pedrol | 07730bb | 2018-01-25 18:43:38 +0100 | [diff] [blame] | 152 | static unsigned int get_default_gtp(uint8_t version, uint8_t type, void *packet) |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 153 | { |
| 154 | struct gtp0_header *gtp0_default = (struct gtp0_header *)packet; |
| 155 | struct gtp1_header_long *gtp1_default = |
| 156 | (struct gtp1_header_long *)packet; |
| 157 | switch (version) { |
| 158 | case 0: |
| 159 | /* Initialise "standard" GTP0 header */ |
| 160 | memset(gtp0_default, 0, sizeof(struct gtp0_header)); |
| 161 | gtp0_default->flags = 0x1e; |
| 162 | gtp0_default->type = hton8(type); |
| 163 | gtp0_default->spare1 = 0xff; |
| 164 | gtp0_default->spare2 = 0xff; |
| 165 | gtp0_default->spare3 = 0xff; |
| 166 | gtp0_default->number = 0xff; |
| 167 | return GTP0_HEADER_SIZE; |
| 168 | case 1: |
| 169 | /* Initialise "standard" GTP1 header */ |
| 170 | /* 29.060: 8.2: S=1 and PN=0 */ |
| 171 | /* 29.060 9.3.1: For GTP-U messages Echo Request, Echo Response */ |
| 172 | /* and Supported Extension Headers Notification, the S field shall be */ |
| 173 | /* set to 1 */ |
| 174 | /* Currently extension headers are not supported */ |
| 175 | memset(gtp1_default, 0, sizeof(struct gtp1_header_long)); |
Harald Welte | fed598f | 2017-09-24 16:39:22 +0800 | [diff] [blame] | 176 | /* No extension, enable sequence, no N-PDU */ |
| 177 | gtp1_default->flags = GTPHDR_F_VER(1) | GTP1HDR_F_GTP1 | GTP1HDR_F_SEQ; |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 178 | gtp1_default->type = hton8(type); |
| 179 | return GTP1_HEADER_SIZE_LONG; |
| 180 | default: |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 181 | LOGP(DLGTP, LOGL_ERROR, |
Holger Hans Peter Freyther | 01b40d0 | 2014-12-04 15:01:53 +0100 | [diff] [blame] | 182 | "Unknown GTP packet version: %d\n", version); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 183 | return 0; |
| 184 | } |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 185 | } |
| 186 | |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 187 | /** |
| 188 | * get_seq() |
| 189 | * Get sequence number of a packet. |
| 190 | * Returns 0 on error |
| 191 | **/ |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 192 | static uint16_t get_seq(void *pack) |
| 193 | { |
| 194 | union gtp_packet *packet = (union gtp_packet *)pack; |
Harald Welte | fed598f | 2017-09-24 16:39:22 +0800 | [diff] [blame] | 195 | uint8_t ver = GTPHDR_F_GET_VER(packet->flags); |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 196 | |
Harald Welte | fed598f | 2017-09-24 16:39:22 +0800 | [diff] [blame] | 197 | if (ver == 0) { |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 198 | return ntoh16(packet->gtp0.h.seq); |
Harald Welte | fed598f | 2017-09-24 16:39:22 +0800 | [diff] [blame] | 199 | } else if (ver == 1 && (packet->flags & GTP1HDR_F_SEQ)) { /* Version 1 with seq */ |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 200 | return ntoh16(packet->gtp1l.h.seq); |
| 201 | } else { |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 202 | return 0; |
| 203 | } |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 204 | } |
| 205 | |
| 206 | /** |
| 207 | * get_tid() |
| 208 | * Get tunnel identifier of a packet. |
| 209 | * Returns 0 on error |
| 210 | **/ |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 211 | static uint64_t get_tid(void *pack) |
| 212 | { |
| 213 | union gtp_packet *packet = (union gtp_packet *)pack; |
| 214 | |
Harald Welte | fed598f | 2017-09-24 16:39:22 +0800 | [diff] [blame] | 215 | if (GTPHDR_F_GET_VER(packet->flags) == 0) { /* Version 0 */ |
Pablo Neira Ayuso | 1a1ba02 | 2014-03-20 12:35:26 +0100 | [diff] [blame] | 216 | return be64toh(packet->gtp0.h.tid); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 217 | } |
| 218 | return 0; |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 219 | } |
| 220 | |
| 221 | /** |
| 222 | * get_hlen() |
| 223 | * Get the header length of a packet. |
| 224 | * Returns 0 on error |
| 225 | **/ |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 226 | static uint16_t get_hlen(void *pack) |
| 227 | { |
| 228 | union gtp_packet *packet = (union gtp_packet *)pack; |
Harald Welte | fed598f | 2017-09-24 16:39:22 +0800 | [diff] [blame] | 229 | uint8_t ver = GTPHDR_F_GET_VER(packet->flags); |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 230 | |
Harald Welte | fed598f | 2017-09-24 16:39:22 +0800 | [diff] [blame] | 231 | if (ver == 0) { /* Version 0 */ |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 232 | return GTP0_HEADER_SIZE; |
Harald Welte | fed598f | 2017-09-24 16:39:22 +0800 | [diff] [blame] | 233 | } else if (ver == 1 && (packet->flags & 0x07) == 0) { /* Short version 1 */ |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 234 | return GTP1_HEADER_SIZE_SHORT; |
Harald Welte | fed598f | 2017-09-24 16:39:22 +0800 | [diff] [blame] | 235 | } else if (ver == 1) { /* Version 1 with seq/n-pdu/ext */ |
| 236 | return GTP1_HEADER_SIZE_LONG; |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 237 | } else { |
Harald Welte | d37b80a | 2016-12-15 18:33:15 +0100 | [diff] [blame] | 238 | LOGP(DLGTP, LOGL_ERROR, "Unknown packet flags: 0x%02x\n", packet->flags); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 239 | return 0; |
| 240 | } |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 241 | } |
| 242 | |
| 243 | /** |
| 244 | * get_tei() |
| 245 | * Get the tunnel endpoint identifier (flow label) of a packet. |
| 246 | * Returns 0xffffffff on error. |
| 247 | **/ |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 248 | static uint32_t get_tei(void *pack) |
| 249 | { |
| 250 | union gtp_packet *packet = (union gtp_packet *)pack; |
Harald Welte | fed598f | 2017-09-24 16:39:22 +0800 | [diff] [blame] | 251 | uint8_t ver = GTPHDR_F_GET_VER(packet->flags); |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 252 | |
Harald Welte | fed598f | 2017-09-24 16:39:22 +0800 | [diff] [blame] | 253 | if (ver == 0) { /* Version 0 */ |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 254 | return ntoh16(packet->gtp0.h.flow); |
Harald Welte | fed598f | 2017-09-24 16:39:22 +0800 | [diff] [blame] | 255 | } else if (ver == 1) { /* Version 1 */ |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 256 | return ntoh32(packet->gtp1l.h.tei); |
| 257 | } else { |
Harald Welte | d37b80a | 2016-12-15 18:33:15 +0100 | [diff] [blame] | 258 | LOGP(DLGTP, LOGL_ERROR, "Unknown packet flags: 0x%02x\n", packet->flags); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 259 | return 0xffffffff; |
| 260 | } |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 261 | } |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 262 | |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 263 | /* *********************************************************** |
| 264 | * Reliable delivery of signalling messages |
Pau Espin Pedrol | 732131d | 2018-01-25 17:23:09 +0100 | [diff] [blame] | 265 | * |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 266 | * Sequence numbers are used for both signalling messages and |
| 267 | * data messages. |
| 268 | * |
| 269 | * For data messages each tunnel maintains a sequence counter, |
| 270 | * which is incremented by one each time a new data message |
| 271 | * is sent. The sequence number starts at (0) zero at tunnel |
Pau Espin Pedrol | 732131d | 2018-01-25 17:23:09 +0100 | [diff] [blame] | 272 | * establishment, and wraps around at 65535 (29.060 9.3.1.1 |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 273 | * and 09.60 8.1.1.1). The sequence numbers are either ignored, |
| 274 | * or can be used to check the validity of the message in the |
| 275 | * receiver, or for reordering af packets. |
| 276 | * |
Pau Espin Pedrol | 732131d | 2018-01-25 17:23:09 +0100 | [diff] [blame] | 277 | * For signalling messages the sequence number is used by |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 278 | * signalling messages for which a response is defined. A response |
| 279 | * message should copy the sequence from the corresponding request |
| 280 | * message. The sequence number "unambiguously" identifies a request |
| 281 | * message within a given path, with a path being defined as a set of |
| 282 | * two endpoints (29.060 8.2, 29.060 7.6, 09.60 7.8). "All request |
| 283 | * messages shall be responded to, and all response messages associated |
| 284 | * with a certain request shall always include the same information" |
| 285 | * |
| 286 | * We take this to mean that the GSN transmitting a request is free to |
| 287 | * choose the sequence number, as long as it is unique within a given path. |
| 288 | * It means that we are allowed to count backwards, or roll over at 17 |
| 289 | * if we prefer that. It also means that we can use the same counter for |
| 290 | * all paths. This has the advantage that the transmitted request sequence |
| 291 | * numbers are unique within each GSN, and also we dont have to mess around |
| 292 | * with path setup and teardown. |
| 293 | * |
| 294 | * If a response message is lost, the request will be retransmitted, and |
Pau Espin Pedrol | 732131d | 2018-01-25 17:23:09 +0100 | [diff] [blame] | 295 | * the receiving GSN will receive a "duplicated" request. The standard |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 296 | * requires the receiving GSN to send a response, with the same information |
| 297 | * as in the original response. For most messages this happens automatically: |
| 298 | * |
Pau Espin Pedrol | de72d26 | 2019-05-29 18:17:05 +0200 | [diff] [blame] | 299 | * Echo: Automatically duplicates the original response |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 300 | * Create pdp context: The SGSN may send create context request even if |
| 301 | * a context allready exist (imsi+nsapi?). This means that the reply will |
Pau Espin Pedrol | de72d26 | 2019-05-29 18:17:05 +0200 | [diff] [blame] | 302 | automatically duplicate the original response. It might however have |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 303 | * side effects in the application which is asked twice to validate |
| 304 | * the login. |
Pau Espin Pedrol | de72d26 | 2019-05-29 18:17:05 +0200 | [diff] [blame] | 305 | * Update pdp context: Automatically duplicates the original response??? |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 306 | * Delete pdp context. Automatically in gtp0, but in gtp1 will generate |
| 307 | * a nonexist reply message. |
| 308 | * |
| 309 | * The correct solution will be to make a queue containing response messages. |
Pau Espin Pedrol | 732131d | 2018-01-25 17:23:09 +0100 | [diff] [blame] | 310 | * This queue should be checked whenever a request is received. If the |
Pau Espin Pedrol | 0d3bd34 | 2022-11-02 13:22:17 +0100 | [diff] [blame] | 311 | * response is already in the queue that response should be transmitted. |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 312 | * It should be possible to find messages in this queue on the basis of |
| 313 | * the sequence number and peer GSN IP address (The sequense number is unique |
| 314 | * within each path). This need to be implemented by a hash table. Furthermore |
| 315 | * it should be possibly to delete messages based on a timeout. This can be |
| 316 | * achieved by means of a linked list. The timeout value need to be larger |
Pau Espin Pedrol | 732131d | 2018-01-25 17:23:09 +0100 | [diff] [blame] | 317 | * than T3-RESPONSE * N3-REQUESTS (recommended value 5). These timers are |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 318 | * set in the peer GSN, so there is no way to know these parameters. On the |
| 319 | * other hand the timeout value need to be so small that we do not receive |
| 320 | * wraparound sequence numbere before the message is deleted. 60 seconds is |
| 321 | * probably not a bad choise. |
Pau Espin Pedrol | 732131d | 2018-01-25 17:23:09 +0100 | [diff] [blame] | 322 | * |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 323 | * This queue however is first really needed from gtp1. |
| 324 | * |
Pau Espin Pedrol | 732131d | 2018-01-25 17:23:09 +0100 | [diff] [blame] | 325 | * gtp_req: |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 326 | * Send off a signalling message with appropiate sequence |
| 327 | * number. Store packet in queue. |
| 328 | * gtp_conf: |
| 329 | * Remove an incoming confirmation from the queue |
| 330 | * gtp_resp: |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 331 | * Send off a response to a request. Use the same sequence |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 332 | * number in the response as in the request. |
jjako | 2c38133 | 2003-10-21 19:09:53 +0000 | [diff] [blame] | 333 | * gtp_notification: |
| 334 | * Send off a notification message. This is neither a request nor |
| 335 | * a response. Both TEI and SEQ are zero. |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 336 | * gtp_retrans: |
| 337 | * Retransmit any outstanding packets which have exceeded |
| 338 | * a predefined timeout. |
| 339 | *************************************************************/ |
| 340 | |
Pau Espin Pedrol | 07730bb | 2018-01-25 18:43:38 +0100 | [diff] [blame] | 341 | static int gtp_req(struct gsn_t *gsn, uint8_t version, struct pdp_t *pdp, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 342 | union gtp_packet *packet, int len, |
Daniel Willmann | cd970ed | 2024-01-03 15:03:24 +0100 | [diff] [blame] | 343 | const struct in_addr *inetaddr, void *cbp) |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 344 | { |
Harald Welte | fed598f | 2017-09-24 16:39:22 +0800 | [diff] [blame] | 345 | uint8_t ver = GTPHDR_F_GET_VER(packet->flags); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 346 | struct sockaddr_in addr; |
| 347 | struct qmsg_t *qmsg; |
| 348 | int fd; |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 349 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 350 | memset(&addr, 0, sizeof(addr)); |
| 351 | addr.sin_family = AF_INET; |
| 352 | addr.sin_addr = *inetaddr; |
jjako | 0fe0df0 | 2004-09-17 11:30:40 +0000 | [diff] [blame] | 353 | #if defined(__FreeBSD__) || defined(__APPLE__) |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 354 | addr.sin_len = sizeof(addr); |
jjako | 06e9f12 | 2004-01-19 18:37:58 +0000 | [diff] [blame] | 355 | #endif |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 356 | |
Harald Welte | fed598f | 2017-09-24 16:39:22 +0800 | [diff] [blame] | 357 | if (ver == 0) { /* Version 0 */ |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 358 | addr.sin_port = htons(GTP0_PORT); |
| 359 | packet->gtp0.h.length = hton16(len - GTP0_HEADER_SIZE); |
| 360 | packet->gtp0.h.seq = hton16(gsn->seq_next); |
Pablo Neira Ayuso | 1a1ba02 | 2014-03-20 12:35:26 +0100 | [diff] [blame] | 361 | if (pdp) { |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 362 | packet->gtp0.h.tid = |
Pablo Neira Ayuso | 746b944 | 2014-03-24 17:58:27 +0100 | [diff] [blame] | 363 | htobe64(pdp_gettid(pdp->imsi, pdp->nsapi)); |
Pablo Neira Ayuso | 1a1ba02 | 2014-03-20 12:35:26 +0100 | [diff] [blame] | 364 | } |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 365 | if (pdp && ((packet->gtp0.h.type == GTP_GPDU) |
| 366 | || (packet->gtp0.h.type == GTP_ERROR))) |
| 367 | packet->gtp0.h.flow = hton16(pdp->flru); |
| 368 | else if (pdp) |
| 369 | packet->gtp0.h.flow = hton16(pdp->flrc); |
| 370 | fd = gsn->fd0; |
Harald Welte | fed598f | 2017-09-24 16:39:22 +0800 | [diff] [blame] | 371 | } else if (ver == 1 && (packet->flags & GTP1HDR_F_SEQ)) { /* Version 1 with seq */ |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 372 | addr.sin_port = htons(GTP1C_PORT); |
| 373 | packet->gtp1l.h.length = hton16(len - GTP1_HEADER_SIZE_SHORT); |
| 374 | packet->gtp1l.h.seq = hton16(gsn->seq_next); |
| 375 | if (pdp && ((packet->gtp1l.h.type == GTP_GPDU) || |
| 376 | (packet->gtp1l.h.type == GTP_ERROR))) |
| 377 | packet->gtp1l.h.tei = hton32(pdp->teid_gn); |
| 378 | else if (pdp) |
| 379 | packet->gtp1l.h.tei = hton32(pdp->teic_gn); |
| 380 | fd = gsn->fd1c; |
| 381 | } else { |
Harald Welte | d37b80a | 2016-12-15 18:33:15 +0100 | [diff] [blame] | 382 | LOGP(DLGTP, LOGL_ERROR, "Unknown packet flags: 0x%02x\n", packet->flags); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 383 | return -1; |
| 384 | } |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 385 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 386 | if (sendto(fd, packet, len, 0, |
| 387 | (struct sockaddr *)&addr, sizeof(addr)) < 0) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 388 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_ERR_SENDTO); |
Max | 14b1b63 | 2017-08-21 20:14:59 +0200 | [diff] [blame] | 389 | LOGP(DLGTP, LOGL_ERROR, "Sendto(fd=%d, msg=%lx, len=%d, dst=%s) failed: Error = %s\n", fd, |
| 390 | (unsigned long)&packet, len, inet_ntoa(addr.sin_addr), strerror(errno)); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 391 | return -1; |
| 392 | } |
| 393 | |
| 394 | /* Use new queue structure */ |
| 395 | if (queue_newmsg(gsn->queue_req, &qmsg, &addr, gsn->seq_next)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 396 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_ERR_QUEUEFULL); |
Pau Espin Pedrol | bdf0697 | 2022-03-07 12:49:34 +0100 | [diff] [blame] | 397 | LOGP(DLGTP, LOGL_ERROR, "Retransmit req queue is full (seq=%" PRIu16 ")\n", |
| 398 | gsn->seq_next); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 399 | } else { |
Pau Espin Pedrol | 9f1f747 | 2022-11-02 19:52:19 +0100 | [diff] [blame] | 400 | unsigned int t3_response; |
Pau Espin Pedrol | f471800 | 2022-03-07 12:55:51 +0100 | [diff] [blame] | 401 | LOGP(DLGTP, LOGL_DEBUG, "Registering seq=%" PRIu16 |
| 402 | " in restransmit req queue\n", gsn->seq_next); |
Pau Espin Pedrol | 9f1f747 | 2022-11-02 19:52:19 +0100 | [diff] [blame] | 403 | t3_response = osmo_tdef_get(gsn->tdef, GTP_GSN_TIMER_T3_RESPONSE, OSMO_TDEF_S, -1); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 404 | memcpy(&qmsg->p, packet, sizeof(union gtp_packet)); |
| 405 | qmsg->l = len; |
Pau Espin Pedrol | 9f1f747 | 2022-11-02 19:52:19 +0100 | [diff] [blame] | 406 | qmsg->timeout = time(NULL) + t3_response; /* When to timeout */ |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 407 | qmsg->retrans = 0; /* No retransmissions so far */ |
| 408 | qmsg->cbp = cbp; |
| 409 | qmsg->type = ntoh8(packet->gtp0.h.type); |
| 410 | qmsg->fd = fd; |
Pau Espin Pedrol | 623c5b3 | 2019-08-16 13:20:09 +0200 | [diff] [blame] | 411 | if (pdp) /* echo requests are not pdp-bound */ |
| 412 | llist_add(&qmsg->entry, &pdp->qmsg_list_req); |
Pau Espin Pedrol | c94837c | 2019-08-28 19:44:20 +0200 | [diff] [blame] | 413 | |
| 414 | /* Rearm timer: Retrans time for qmsg just queued may be required |
| 415 | before an existing one (for instance a gtp echo req) */ |
Pau Espin Pedrol | 724ecc6 | 2022-11-02 14:57:24 +0100 | [diff] [blame] | 416 | gtp_queue_timer_start(gsn); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 417 | } |
| 418 | gsn->seq_next++; /* Count up this time */ |
| 419 | return 0; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 420 | } |
| 421 | |
| 422 | /* gtp_conf |
| 423 | * Remove signalling packet from retransmission queue. |
| 424 | * return 0 on success, EOF if packet was not found */ |
| 425 | |
Pau Espin Pedrol | 07730bb | 2018-01-25 18:43:38 +0100 | [diff] [blame] | 426 | static int gtp_conf(struct gsn_t *gsn, uint8_t version, struct sockaddr_in *peer, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 427 | union gtp_packet *packet, int len, uint8_t * type, void **cbp) |
| 428 | { |
Harald Welte | fed598f | 2017-09-24 16:39:22 +0800 | [diff] [blame] | 429 | uint8_t ver = GTPHDR_F_GET_VER(packet->flags); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 430 | uint16_t seq; |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 431 | |
Harald Welte | fed598f | 2017-09-24 16:39:22 +0800 | [diff] [blame] | 432 | if (ver == 0) |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 433 | seq = ntoh16(packet->gtp0.h.seq); |
Harald Welte | fed598f | 2017-09-24 16:39:22 +0800 | [diff] [blame] | 434 | else if (ver == 1 && (packet->gtp1l.h.flags & GTP1HDR_F_SEQ)) |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 435 | seq = ntoh16(packet->gtp1l.h.seq); |
| 436 | else { |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 437 | GTP_LOGPKG(LOGL_ERROR, peer, packet, len, |
| 438 | "Unknown GTP packet version\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 439 | return EOF; |
| 440 | } |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 441 | |
Pau Espin Pedrol | f471800 | 2022-03-07 12:55:51 +0100 | [diff] [blame] | 442 | GTP_LOGPKG(LOGL_DEBUG, peer, packet, len, |
| 443 | "Freeing seq=%" PRIu16 " from retransmit req queue\n", |
| 444 | seq); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 445 | if (queue_freemsg_seq(gsn->queue_req, peer, seq, type, cbp)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 446 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_ERR_SEQ); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 447 | GTP_LOGPKG(LOGL_ERROR, peer, packet, len, |
Pau Espin Pedrol | f471800 | 2022-03-07 12:55:51 +0100 | [diff] [blame] | 448 | "Confirmation packet not found in retransmit req queue (seq=%" |
| 449 | PRIu16 ")\n", seq); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 450 | return EOF; |
| 451 | } |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 452 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 453 | return 0; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 454 | } |
| 455 | |
Daniel Willmann | 6d85d2a | 2024-01-26 16:24:50 +0100 | [diff] [blame] | 456 | static int gtp_resp2(struct gsn_t *gsn, union gtp_packet *packet, int len, struct sockaddr_in *peer, int fd, uint16_t seq, uint64_t tid, uint16_t flow, uint32_t tei) |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 457 | { |
Harald Welte | fed598f | 2017-09-24 16:39:22 +0800 | [diff] [blame] | 458 | uint8_t ver = GTPHDR_F_GET_VER(packet->flags); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 459 | struct qmsg_t *qmsg; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 460 | |
Harald Welte | fed598f | 2017-09-24 16:39:22 +0800 | [diff] [blame] | 461 | if (ver == 0) { /* Version 0 */ |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 462 | packet->gtp0.h.length = hton16(len - GTP0_HEADER_SIZE); |
| 463 | packet->gtp0.h.seq = hton16(seq); |
Pablo Neira Ayuso | 1a1ba02 | 2014-03-20 12:35:26 +0100 | [diff] [blame] | 464 | packet->gtp0.h.tid = htobe64(tid); |
Daniel Willmann | 6d85d2a | 2024-01-26 16:24:50 +0100 | [diff] [blame] | 465 | packet->gtp0.h.flow = hton16(flow); |
Harald Welte | fed598f | 2017-09-24 16:39:22 +0800 | [diff] [blame] | 466 | } else if (ver == 1 && (packet->flags & GTP1HDR_F_SEQ)) { /* Version 1 with seq */ |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 467 | packet->gtp1l.h.length = hton16(len - GTP1_HEADER_SIZE_SHORT); |
| 468 | packet->gtp1l.h.seq = hton16(seq); |
Daniel Willmann | 6d85d2a | 2024-01-26 16:24:50 +0100 | [diff] [blame] | 469 | packet->gtp1l.h.tei = hton32(tei); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 470 | } else { |
Harald Welte | d37b80a | 2016-12-15 18:33:15 +0100 | [diff] [blame] | 471 | LOGP(DLGTP, LOGL_ERROR, "Unknown packet flags: 0x%02x\n", packet->flags); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 472 | return -1; |
| 473 | } |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 474 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 475 | if (fcntl(fd, F_SETFL, 0)) { |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 476 | LOGP(DLGTP, LOGL_ERROR, "fnctl()\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 477 | return -1; |
| 478 | } |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 479 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 480 | if (sendto(fd, packet, len, 0, |
Daniel Willmann | cd970ed | 2024-01-03 15:03:24 +0100 | [diff] [blame] | 481 | (const struct sockaddr *)peer, sizeof(struct sockaddr_in)) < 0) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 482 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_ERR_SENDTO); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 483 | LOGP(DLGTP, LOGL_ERROR, |
| 484 | "Sendto(fd=%d, msg=%lx, len=%d) failed: Error = %s\n", fd, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 485 | (unsigned long)&packet, len, strerror(errno)); |
| 486 | return -1; |
| 487 | } |
| 488 | |
| 489 | /* Use new queue structure */ |
| 490 | if (queue_newmsg(gsn->queue_resp, &qmsg, peer, seq)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 491 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_ERR_QUEUEFULL); |
Pau Espin Pedrol | bdf0697 | 2022-03-07 12:49:34 +0100 | [diff] [blame] | 492 | LOGP(DLGTP, LOGL_ERROR, "Retransmit resp queue is full (seq=%" PRIu16 ")\n", |
| 493 | seq); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 494 | } else { |
Pau Espin Pedrol | 3a55b89 | 2022-11-04 11:21:23 +0100 | [diff] [blame] | 495 | unsigned int t3_hold_resp; |
Pau Espin Pedrol | f471800 | 2022-03-07 12:55:51 +0100 | [diff] [blame] | 496 | LOGP(DLGTP, LOGL_DEBUG, "Registering seq=%" PRIu16 |
| 497 | " in restransmit resp queue\n", seq); |
Pau Espin Pedrol | 3a55b89 | 2022-11-04 11:21:23 +0100 | [diff] [blame] | 498 | t3_hold_resp = osmo_tdef_get(gsn->tdef, GTP_GSN_TIMER_T3_HOLD_RESPONSE, OSMO_TDEF_S, -1); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 499 | memcpy(&qmsg->p, packet, sizeof(union gtp_packet)); |
| 500 | qmsg->l = len; |
Pau Espin Pedrol | 3a55b89 | 2022-11-04 11:21:23 +0100 | [diff] [blame] | 501 | qmsg->timeout = time(NULL) + t3_hold_resp; /* When to timeout */ |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 502 | qmsg->retrans = 0; /* No retransmissions so far */ |
| 503 | qmsg->cbp = NULL; |
| 504 | qmsg->type = 0; |
| 505 | qmsg->fd = fd; |
Pau Espin Pedrol | 623c5b3 | 2019-08-16 13:20:09 +0200 | [diff] [blame] | 506 | /* No need to add to pdp list here, because even on pdp ctx free |
| 507 | we want to leave messages in queue_resp until timeout to |
| 508 | detect duplicates */ |
Pau Espin Pedrol | c94837c | 2019-08-28 19:44:20 +0200 | [diff] [blame] | 509 | |
| 510 | /* Rearm timer: Retrans time for qmsg just queued may be required |
| 511 | before an existing one (for instance a gtp echo req) */ |
Pau Espin Pedrol | 724ecc6 | 2022-11-02 14:57:24 +0100 | [diff] [blame] | 512 | gtp_queue_timer_start(gsn); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 513 | } |
| 514 | return 0; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 515 | } |
| 516 | |
Daniel Willmann | 6d85d2a | 2024-01-26 16:24:50 +0100 | [diff] [blame] | 517 | static int gtp_resp(uint8_t version, struct gsn_t *gsn, struct pdp_t *pdp, |
| 518 | union gtp_packet *packet, int len, |
| 519 | struct sockaddr_in *peer, int fd, uint16_t seq, uint64_t tid) |
| 520 | { |
| 521 | uint8_t ver = GTPHDR_F_GET_VER(packet->flags); |
| 522 | uint16_t flow = 0, tei = 0; |
| 523 | |
| 524 | if (ver == 0) { /* Version 0 */ |
| 525 | if (pdp && ((packet->gtp0.h.type == GTP_GPDU) || |
| 526 | (packet->gtp0.h.type == GTP_ERROR))) |
| 527 | flow = pdp->flru; |
| 528 | else if (pdp) |
| 529 | flow = pdp->flrc; |
| 530 | } else if (ver == 1 && (packet->flags & GTP1HDR_F_SEQ)) { /* Version 1 with seq */ |
| 531 | if (pdp && (fd == gsn->fd1u)) |
| 532 | tei = pdp->teid_gn; |
| 533 | else if (pdp) |
| 534 | tei = pdp->teic_gn; |
| 535 | } else { |
| 536 | LOGP(DLGTP, LOGL_ERROR, "Unknown packet flags: 0x%02x\n", packet->flags); |
| 537 | return -1; |
| 538 | } |
| 539 | |
Daniel Willmann | 54fcd64 | 2024-03-06 11:53:37 +0100 | [diff] [blame] | 540 | return gtp_resp2(gsn, packet, len, peer, fd, seq, tid, flow, tei); |
Daniel Willmann | 6d85d2a | 2024-01-26 16:24:50 +0100 | [diff] [blame] | 541 | } |
Daniel Willmann | 54fcd64 | 2024-03-06 11:53:37 +0100 | [diff] [blame] | 542 | |
Pau Espin Pedrol | 07730bb | 2018-01-25 18:43:38 +0100 | [diff] [blame] | 543 | static int gtp_notification(struct gsn_t *gsn, uint8_t version, |
jjako | 2c38133 | 2003-10-21 19:09:53 +0000 | [diff] [blame] | 544 | union gtp_packet *packet, int len, |
Pau Espin Pedrol | 2eed6ec | 2021-05-05 17:51:19 +0200 | [diff] [blame] | 545 | const struct sockaddr_in *peer, int fd, uint16_t seq) |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 546 | { |
jjako | 2c38133 | 2003-10-21 19:09:53 +0000 | [diff] [blame] | 547 | |
Harald Welte | fed598f | 2017-09-24 16:39:22 +0800 | [diff] [blame] | 548 | uint8_t ver = GTPHDR_F_GET_VER(packet->flags); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 549 | struct sockaddr_in addr; |
jjako | 2c38133 | 2003-10-21 19:09:53 +0000 | [diff] [blame] | 550 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 551 | memcpy(&addr, peer, sizeof(addr)); |
jjako | 2c38133 | 2003-10-21 19:09:53 +0000 | [diff] [blame] | 552 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 553 | /* In GTP0 notifications are treated as replies. In GTP1 they |
| 554 | are requests for which there is no reply */ |
jjako | 2c38133 | 2003-10-21 19:09:53 +0000 | [diff] [blame] | 555 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 556 | if (fd == gsn->fd1c) |
| 557 | addr.sin_port = htons(GTP1C_PORT); |
| 558 | else if (fd == gsn->fd1u) |
| 559 | addr.sin_port = htons(GTP1C_PORT); |
jjako | 2c38133 | 2003-10-21 19:09:53 +0000 | [diff] [blame] | 560 | |
Harald Welte | fed598f | 2017-09-24 16:39:22 +0800 | [diff] [blame] | 561 | if (ver == 0) { /* Version 0 */ |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 562 | packet->gtp0.h.length = hton16(len - GTP0_HEADER_SIZE); |
| 563 | packet->gtp0.h.seq = hton16(seq); |
Harald Welte | fed598f | 2017-09-24 16:39:22 +0800 | [diff] [blame] | 564 | } else if (ver == 1 && (packet->flags & GTP1HDR_F_SEQ)) { /* Version 1 with seq */ |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 565 | packet->gtp1l.h.length = hton16(len - GTP1_HEADER_SIZE_SHORT); |
| 566 | packet->gtp1l.h.seq = hton16(seq); |
| 567 | } else { |
Harald Welte | d37b80a | 2016-12-15 18:33:15 +0100 | [diff] [blame] | 568 | LOGP(DLGTP, LOGL_ERROR, "Unknown packet flags: 0x%02x\n", packet->flags); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 569 | return -1; |
| 570 | } |
| 571 | |
| 572 | if (fcntl(fd, F_SETFL, 0)) { |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 573 | LOGP(DLGTP, LOGL_ERROR, "fnctl()\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 574 | return -1; |
| 575 | } |
| 576 | |
| 577 | if (sendto(fd, packet, len, 0, |
| 578 | (struct sockaddr *)&addr, sizeof(struct sockaddr_in)) < 0) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 579 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_ERR_SENDTO); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 580 | LOGP(DLGTP, LOGL_ERROR, |
| 581 | "Sendto(fd=%d, msg=%lx, len=%d) failed: Error = %s\n", fd, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 582 | (unsigned long)&packet, len, strerror(errno)); |
| 583 | return -1; |
| 584 | } |
| 585 | return 0; |
jjako | 2c38133 | 2003-10-21 19:09:53 +0000 | [diff] [blame] | 586 | } |
| 587 | |
Pau Espin Pedrol | de72d26 | 2019-05-29 18:17:05 +0200 | [diff] [blame] | 588 | static int gtp_duplicate(struct gsn_t *gsn, uint8_t version, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 589 | struct sockaddr_in *peer, uint16_t seq) |
| 590 | { |
| 591 | struct qmsg_t *qmsg; |
Pau Espin Pedrol | 1bf3b3d | 2022-03-07 12:19:24 +0100 | [diff] [blame] | 592 | char buf[INET_ADDRSTRLEN]; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 593 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 594 | if (queue_seqget(gsn->queue_resp, &qmsg, peer, seq)) { |
| 595 | return EOF; /* Notfound */ |
| 596 | } |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 597 | |
Pau Espin Pedrol | 1bf3b3d | 2022-03-07 12:19:24 +0100 | [diff] [blame] | 598 | |
| 599 | buf[0] = '\0'; |
| 600 | inet_ntop(AF_INET, &peer->sin_addr, buf, sizeof(buf)); |
| 601 | LOGP(DLGTP, LOGL_INFO, |
| 602 | "Rx duplicate seq=%" PRIu16 " from %s, retrans resp\n", seq, buf); |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 603 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_DUPLICATE); |
Pau Espin Pedrol | 1bf3b3d | 2022-03-07 12:19:24 +0100 | [diff] [blame] | 604 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 605 | if (fcntl(qmsg->fd, F_SETFL, 0)) { |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 606 | LOGP(DLGTP, LOGL_ERROR, "fnctl()\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 607 | return -1; |
| 608 | } |
| 609 | |
| 610 | if (sendto(qmsg->fd, &qmsg->p, qmsg->l, 0, |
| 611 | (struct sockaddr *)peer, sizeof(struct sockaddr_in)) < 0) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 612 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_ERR_SENDTO); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 613 | LOGP(DLGTP, LOGL_ERROR, |
| 614 | "Sendto(fd=%d, msg=%lx, len=%d) failed: Error = %s\n", |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 615 | qmsg->fd, (unsigned long)&qmsg->p, qmsg->l, |
| 616 | strerror(errno)); |
| 617 | } |
| 618 | return 0; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 619 | } |
| 620 | |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 621 | /* *********************************************************** |
| 622 | * Path management messages |
| 623 | * Messages: echo and version not supported. |
| 624 | * A path is connection between two UDP/IP endpoints |
| 625 | * |
| 626 | * A path is either using GTP0 or GTP1. A path can be |
| 627 | * established by any kind of GTP message?? |
| 628 | |
| 629 | * Which source port to use? |
| 630 | * GTP-C request destination port is 2123/3386 |
| 631 | * GTP-U request destination port is 2152/3386 |
| 632 | * T-PDU destination port is 2152/3386. |
| 633 | * For the above messages the source port is locally allocated. |
| 634 | * For response messages src=rx-dst and dst=rx-src. |
| 635 | * For simplicity we should probably use 2123+2152/3386 as |
| 636 | * src port even for the cases where src can be locally |
| 637 | * allocated. This also means that we have to listen only to |
| 638 | * the same ports. |
| 639 | * For response messages we need to be able to respond to |
| 640 | * the relevant src port even if it is locally allocated by |
| 641 | * the peer. |
Pau Espin Pedrol | 732131d | 2018-01-25 17:23:09 +0100 | [diff] [blame] | 642 | * |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 643 | * The need for path management! |
| 644 | * We might need to keep a list of active paths. This might |
| 645 | * be in the form of remote IP address + UDP port numbers. |
| 646 | * (We will consider a path astablished if we have a context |
| 647 | * with the node in question) |
| 648 | *************************************************************/ |
| 649 | |
| 650 | /* Send off an echo request */ |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 651 | int gtp_echo_req(struct gsn_t *gsn, int version, void *cbp, |
| 652 | struct in_addr *inetaddr) |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 653 | { |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 654 | union gtp_packet packet; |
| 655 | unsigned int length = get_default_gtp(version, GTP_ECHO_REQ, &packet); |
| 656 | return gtp_req(gsn, version, NULL, &packet, length, inetaddr, cbp); |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 657 | } |
| 658 | |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 659 | /* Send off an echo reply */ |
| 660 | int gtp_echo_resp(struct gsn_t *gsn, int version, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 661 | struct sockaddr_in *peer, int fd, void *pack, unsigned len) |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 662 | { |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 663 | union gtp_packet packet; |
| 664 | unsigned int length = get_default_gtp(version, GTP_ECHO_RSP, &packet); |
| 665 | gtpie_tv1(&packet, &length, GTP_MAX, GTPIE_RECOVERY, |
| 666 | gsn->restart_counter); |
| 667 | return gtp_resp(version, gsn, NULL, &packet, length, peer, fd, |
| 668 | get_seq(pack), get_tid(pack)); |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 669 | } |
| 670 | |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 671 | /* Handle a received echo request */ |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 672 | int gtp_echo_ind(struct gsn_t *gsn, int version, struct sockaddr_in *peer, |
| 673 | int fd, void *pack, unsigned len) |
| 674 | { |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 675 | |
Pau Espin Pedrol | de72d26 | 2019-05-29 18:17:05 +0200 | [diff] [blame] | 676 | /* Check if it was a duplicate request */ |
| 677 | if (!gtp_duplicate(gsn, 0, peer, get_seq(pack))) |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 678 | return 0; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 679 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 680 | /* Send off reply to request */ |
| 681 | return gtp_echo_resp(gsn, version, peer, fd, pack, len); |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 682 | } |
| 683 | |
| 684 | /* Handle a received echo reply */ |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 685 | int gtp_echo_conf(struct gsn_t *gsn, int version, struct sockaddr_in *peer, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 686 | void *pack, unsigned len) |
| 687 | { |
| 688 | union gtpie_member *ie[GTPIE_SIZE]; |
| 689 | unsigned char recovery; |
| 690 | void *cbp = NULL; |
| 691 | uint8_t type = 0; |
| 692 | int hlen = get_hlen(pack); |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 693 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 694 | /* Remove packet from queue */ |
| 695 | if (gtp_conf(gsn, version, peer, pack, len, &type, &cbp)) |
| 696 | return EOF; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 697 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 698 | /* Extract information elements into a pointer array */ |
| 699 | if (gtpie_decaps(ie, version, pack + hlen, len - hlen)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 700 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_INVALID); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 701 | GTP_LOGPKG(LOGL_ERROR, peer, pack, len, |
| 702 | "Invalid message format\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 703 | if (gsn->cb_conf) |
| 704 | gsn->cb_conf(type, EOF, NULL, cbp); |
| 705 | return EOF; |
| 706 | } |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 707 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 708 | if (gtpie_gettv1(ie, GTPIE_RECOVERY, 0, &recovery)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 709 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_MISSING); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 710 | GTP_LOGPKG(LOGL_ERROR, peer, pack, len, |
| 711 | "Missing mandatory field\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 712 | if (gsn->cb_conf) |
| 713 | gsn->cb_conf(type, EOF, NULL, cbp); |
| 714 | return EOF; |
| 715 | } |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 716 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 717 | /* Echo reply packages does not have a cause information element */ |
| 718 | /* Instead we return the recovery number in the callback function */ |
| 719 | if (gsn->cb_conf) |
| 720 | gsn->cb_conf(type, recovery, NULL, cbp); |
Harald Welte | 629e986 | 2010-12-24 20:58:09 +0100 | [diff] [blame] | 721 | |
Pau Espin Pedrol | b5f9334 | 2018-07-23 11:24:07 +0200 | [diff] [blame] | 722 | emit_cb_recovery(gsn, peer, NULL, recovery); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 723 | |
| 724 | return 0; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 725 | } |
| 726 | |
| 727 | /* Send off a Version Not Supported message */ |
| 728 | /* This message is somewhat special in that it actually is a |
| 729 | * response to some other message with unsupported GTP version |
| 730 | * For this reason it has parameters like a response, and does |
Pau Espin Pedrol | 732131d | 2018-01-25 17:23:09 +0100 | [diff] [blame] | 731 | * its own message transmission. No signalling queue is used |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 732 | * The reply is sent to the peer IP and peer UDP. This means that |
Pau Espin Pedrol | 732131d | 2018-01-25 17:23:09 +0100 | [diff] [blame] | 733 | * the peer will be receiving a GTP0 message on a GTP1 port! |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 734 | * In practice however this will never happen as a GTP0 GSN will |
| 735 | * only listen to the GTP0 port, and therefore will never receive |
| 736 | * anything else than GTP0 */ |
| 737 | |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 738 | int gtp_unsup_req(struct gsn_t *gsn, int version, struct sockaddr_in *peer, |
| 739 | int fd, void *pack, unsigned len) |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 740 | { |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 741 | union gtp_packet packet; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 742 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 743 | /* GTP 1 is the highest supported protocol */ |
| 744 | unsigned int length = get_default_gtp(1, GTP_NOT_SUPPORTED, &packet); |
| 745 | return gtp_notification(gsn, version, &packet, length, peer, fd, 0); |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 746 | } |
| 747 | |
| 748 | /* Handle a Version Not Supported message */ |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 749 | int gtp_unsup_ind(struct gsn_t *gsn, struct sockaddr_in *peer, |
| 750 | void *pack, unsigned len) |
| 751 | { |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 752 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 753 | if (gsn->cb_unsup_ind) |
| 754 | gsn->cb_unsup_ind(peer); |
| 755 | |
| 756 | return 0; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 757 | } |
| 758 | |
jjako | 2c38133 | 2003-10-21 19:09:53 +0000 | [diff] [blame] | 759 | /* Send off an Supported Extension Headers Notification */ |
Pau Espin Pedrol | 07730bb | 2018-01-25 18:43:38 +0100 | [diff] [blame] | 760 | static int gtp_extheader_req(struct gsn_t *gsn, uint8_t version, struct sockaddr_in *peer, |
jjako | 2c38133 | 2003-10-21 19:09:53 +0000 | [diff] [blame] | 761 | int fd, void *pack, unsigned len) |
| 762 | { |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 763 | union gtp_packet packet; |
| 764 | unsigned int length = |
| 765 | get_default_gtp(version, GTP_SUPP_EXT_HEADER, &packet); |
jjako | 2c38133 | 2003-10-21 19:09:53 +0000 | [diff] [blame] | 766 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 767 | uint8_t pdcp_pdu = GTP_EXT_PDCP_PDU; |
jjako | 2c38133 | 2003-10-21 19:09:53 +0000 | [diff] [blame] | 768 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 769 | if (version < 1) |
| 770 | return 0; |
jjako | 2c38133 | 2003-10-21 19:09:53 +0000 | [diff] [blame] | 771 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 772 | /* We report back that we support only PDCP PDU headers */ |
| 773 | gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_EXT_HEADER_T, |
| 774 | sizeof(pdcp_pdu), &pdcp_pdu); |
jjako | 2c38133 | 2003-10-21 19:09:53 +0000 | [diff] [blame] | 775 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 776 | return gtp_notification(gsn, version, &packet, length, |
| 777 | peer, fd, get_seq(pack)); |
jjako | 2c38133 | 2003-10-21 19:09:53 +0000 | [diff] [blame] | 778 | } |
| 779 | |
| 780 | /* Handle a Supported Extension Headers Notification */ |
Pau Espin Pedrol | 7b38af5 | 2018-01-25 18:35:33 +0100 | [diff] [blame] | 781 | static int gtp_extheader_ind(struct gsn_t *gsn, struct sockaddr_in *peer, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 782 | void *pack, unsigned len) |
| 783 | { |
jjako | 2c38133 | 2003-10-21 19:09:53 +0000 | [diff] [blame] | 784 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 785 | if (gsn->cb_extheader_ind) |
| 786 | gsn->cb_extheader_ind(peer); |
| 787 | |
| 788 | return 0; |
jjako | 2c38133 | 2003-10-21 19:09:53 +0000 | [diff] [blame] | 789 | } |
| 790 | |
Pau Espin Pedrol | f32c6a9 | 2021-05-03 17:58:55 +0200 | [diff] [blame] | 791 | /* Handle a RAN Information Relay message */ |
| 792 | static int gtp_ran_info_relay_ind(struct gsn_t *gsn, int version, struct sockaddr_in *peer, |
| 793 | void *pack, unsigned len) |
| 794 | { |
| 795 | union gtpie_member *ie[GTPIE_SIZE]; |
| 796 | |
| 797 | if (version != 1) { |
| 798 | LOGP(DLGTP, LOGL_NOTICE, |
| 799 | "RAN Information Relay expected only on GTPCv1: %u\n", version); |
| 800 | return -EINVAL; |
| 801 | } |
| 802 | |
| 803 | int hlen = get_hlen(pack); |
| 804 | |
| 805 | /* Decode information elements */ |
| 806 | if (gtpie_decaps(ie, version, pack + hlen, len - hlen)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 807 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_INVALID); |
Pau Espin Pedrol | f32c6a9 | 2021-05-03 17:58:55 +0200 | [diff] [blame] | 808 | GTP_LOGPKG(LOGL_ERROR, peer, pack, len, |
| 809 | "Invalid message format (AN Information Relay)\n"); |
| 810 | return -EINVAL; |
| 811 | } |
| 812 | |
| 813 | if (gsn->cb_ran_info_relay_ind) |
| 814 | gsn->cb_ran_info_relay_ind(peer, ie); |
| 815 | |
| 816 | return 0; |
| 817 | } |
| 818 | |
| 819 | /* Send off a RAN Information Relay message */ |
| 820 | int gtp_ran_info_relay_req(struct gsn_t *gsn, const struct sockaddr_in *peer, |
| 821 | const uint8_t *ran_container, size_t ran_container_len, |
| 822 | const uint8_t *rim_route_addr, size_t rim_route_addr_len, |
| 823 | uint8_t rim_route_addr_discr) |
| 824 | { |
| 825 | union gtp_packet packet; |
| 826 | |
| 827 | /* GTP 1 is the highest supported protocol */ |
| 828 | unsigned int length = get_default_gtp(1, GTP_RAN_INFO_RELAY, &packet); |
| 829 | |
| 830 | gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_RAN_T_CONTAIN, ran_container_len, |
| 831 | ran_container); |
| 832 | if (rim_route_addr) { |
| 833 | gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_RIM_ROUT_ADDR, |
| 834 | rim_route_addr_len, rim_route_addr); |
| 835 | gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_RIM_RA_DISCR, 1, |
| 836 | &rim_route_addr_discr); |
| 837 | } |
| 838 | |
| 839 | return gtp_notification(gsn, 1, &packet, length, peer, gsn->fd1c, 0); |
| 840 | } |
| 841 | |
Daniel Willmann | 6536376 | 2024-01-26 16:36:20 +0100 | [diff] [blame] | 842 | #define GSM_MI_TYPE_TLLI 0x05 |
| 843 | |
Daniel Willmann | 54fcd64 | 2024-03-06 11:53:37 +0100 | [diff] [blame] | 844 | /* Send an SGSN Context Request for an MI */ |
Daniel Willmann | 6536376 | 2024-01-26 16:36:20 +0100 | [diff] [blame] | 845 | int gtp_sgsn_context_req(struct gsn_t *gsn, const struct in_addr *peer, |
Daniel Willmann | 54fcd64 | 2024-03-06 11:53:37 +0100 | [diff] [blame] | 846 | const struct osmo_mobile_identity *mi, uint16_t tlli, uint32_t teic, |
Daniel Willmann | 6536376 | 2024-01-26 16:36:20 +0100 | [diff] [blame] | 847 | const struct ul16_t *sgsn_addr, const struct ul255_t *rai, void *cbp) |
| 848 | { |
| 849 | union gtp_packet packet; |
| 850 | |
| 851 | /* GTP 1 is the highest supported protocol */ |
| 852 | unsigned int length = get_default_gtp(1, GTP_SGSN_CONTEXT_REQ, &packet); |
| 853 | |
| 854 | gtpie_tv0(&packet, &length, GTP_MAX, GTPIE_RAI, rai->l, rai->v); |
| 855 | gtpie_tv4(&packet, &length, GTP_MAX, GTPIE_TEI_C, teic); |
| 856 | gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_GSN_ADDR, sgsn_addr->l, sgsn_addr->v); |
| 857 | |
| 858 | switch (mi->type) { |
| 859 | case GSM_MI_TYPE_IMSI: |
Daniel Willmann | 54fcd64 | 2024-03-06 11:53:37 +0100 | [diff] [blame] | 860 | { |
| 861 | uint64_t imsi = gtp_imsi_str2gtp(mi->imsi); |
| 862 | imsi = ntoh64(imsi); |
| 863 | gtpie_tv8(&packet, &length, GTP_MAX, GTPIE_IMSI, imsi); |
Daniel Willmann | 6536376 | 2024-01-26 16:36:20 +0100 | [diff] [blame] | 864 | break; |
Daniel Willmann | 54fcd64 | 2024-03-06 11:53:37 +0100 | [diff] [blame] | 865 | } |
Daniel Willmann | 6536376 | 2024-01-26 16:36:20 +0100 | [diff] [blame] | 866 | case GSM_MI_TYPE_TLLI: |
| 867 | gtpie_tv4(&packet, &length, GTP_MAX, GTPIE_TLLI, mi->tmsi); |
| 868 | break; |
| 869 | case GSM_MI_TYPE_TMSI: |
| 870 | gtpie_tv4(&packet, &length, GTP_MAX, GTPIE_P_TMSI, mi->tmsi); |
| 871 | break; |
| 872 | default: |
Daniel Willmann | 54fcd64 | 2024-03-06 11:53:37 +0100 | [diff] [blame] | 873 | return -1; |
Daniel Willmann | 6536376 | 2024-01-26 16:36:20 +0100 | [diff] [blame] | 874 | /* TODO: Error */ |
| 875 | break; |
| 876 | } |
| 877 | |
| 878 | return gtp_req(gsn, 1, NULL, &packet, length, peer, cbp); |
| 879 | } |
| 880 | |
| 881 | /* Handle an SGSN Context Request */ |
| 882 | static int gtp_sgsn_context_ind(struct gsn_t *gsn, int version, struct sockaddr_in *peer, |
| 883 | void *pack, unsigned len) |
| 884 | { |
| 885 | /* Check if we have a context with TLLI/P-TMSI/IMSI in the RAI */ |
| 886 | struct osmo_mobile_identity mi = {0}; |
| 887 | uint64_t imsi; |
| 888 | |
| 889 | union gtpie_member *ie[GTPIE_SIZE]; |
| 890 | uint32_t teic; |
| 891 | uint8_t seq = get_seq(pack); |
| 892 | struct ul16_t sgsn_addr; |
| 893 | struct ul255_t rai = { .l = 6 }; |
| 894 | struct osmo_routing_area_id rai_parsed; |
| 895 | |
| 896 | if (version != 1) { |
| 897 | LOGP(DLGTP, LOGL_NOTICE, |
| 898 | "SGSN Context Request expected only on GTPCv1: %u\n", version); |
| 899 | return -EINVAL; |
| 900 | } |
| 901 | |
| 902 | int hlen = get_hlen(pack); |
| 903 | |
| 904 | /* Decode information elements */ |
| 905 | if (gtpie_decaps(ie, version, pack + hlen, len - hlen)) { |
| 906 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_INVALID); |
| 907 | GTP_LOGPKG(LOGL_ERROR, peer, pack, len, |
| 908 | "Invalid message format\n"); |
| 909 | return -EINVAL; |
| 910 | } |
| 911 | |
| 912 | /* RAI */ |
| 913 | if (gtpie_gettv0(ie, GTPIE_RAI, 0, &rai.v, 6)) { |
| 914 | GTP_LOGPKG(LOGL_ERROR, peer, pack, len, |
| 915 | "Missing RAI\n"); |
| 916 | goto missing_ie; |
| 917 | } |
| 918 | if (osmo_routing_area_id_decode(&rai_parsed, rai.v, 6) < 0) { |
| 919 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_INVALID); |
| 920 | GTP_LOGPKG(LOGL_ERROR, peer, pack, len, |
| 921 | "Invalid RAI\n"); |
| 922 | } |
| 923 | |
| 924 | /* TEI-C */ |
| 925 | if (gtpie_gettv4(ie, GTPIE_TEI_C, 0, &teic)) { |
| 926 | GTP_LOGPKG(LOGL_ERROR, peer, pack, len, |
| 927 | "Missing TEI-C\n"); |
| 928 | goto missing_ie; |
| 929 | } |
| 930 | |
| 931 | /* SGSN address for signalling (mandatory) */ |
| 932 | if (gtpie_gettlv(ie, GTPIE_GSN_ADDR, 0, &sgsn_addr.l, |
| 933 | &sgsn_addr.v, sizeof(sgsn_addr.v))) { |
| 934 | GTP_LOGPKG(LOGL_ERROR, peer, pack, len, |
| 935 | "Missing GSN Addr\n"); |
| 936 | goto missing_ie; |
| 937 | } |
| 938 | |
| 939 | /* Get PTMSI, TLLI or IMSI - only one IE allowed */ |
| 940 | if (!gtpie_gettv4(ie, GTPIE_TLLI, 0, &mi.tmsi)) { |
| 941 | mi.type = GSM_MI_TYPE_TLLI; |
| 942 | goto done; |
| 943 | } |
| 944 | |
| 945 | if (!gtpie_gettv4(ie, GTPIE_P_TMSI, 0, &mi.tmsi)) { |
| 946 | mi.type = GSM_MI_TYPE_TMSI; |
| 947 | goto done; |
| 948 | } |
| 949 | |
| 950 | if (!gtpie_gettv8(ie, GTPIE_IMSI, 0, &imsi)) { |
Daniel Willmann | 6536376 | 2024-01-26 16:36:20 +0100 | [diff] [blame] | 951 | mi.type = GSM_MI_TYPE_IMSI; |
Daniel Willmann | 54fcd64 | 2024-03-06 11:53:37 +0100 | [diff] [blame] | 952 | /* NOTE: gtpie_gettv8 already converts to host byte order, but imsi_gtp2str seems to prefer big endian */ |
| 953 | imsi = ntoh64(imsi); |
Daniel Willmann | 6536376 | 2024-01-26 16:36:20 +0100 | [diff] [blame] | 954 | const char *imsi_str = imsi_gtp2str(&imsi); |
| 955 | memcpy(mi.imsi, imsi_str, sizeof(mi.imsi)); |
| 956 | } else { |
| 957 | GTP_LOGPKG(LOGL_ERROR, peer, pack, len, |
| 958 | "Missing Identity information\n"); |
| 959 | goto missing_ie; |
| 960 | } |
| 961 | |
| 962 | done: |
| 963 | if (gsn->cb_sgsn_context_request_ind) |
Daniel Willmann | 54fcd64 | 2024-03-06 11:53:37 +0100 | [diff] [blame] | 964 | gsn->cb_sgsn_context_request_ind(gsn, peer, seq, &rai_parsed, teic, &mi, ie); |
Daniel Willmann | 6536376 | 2024-01-26 16:36:20 +0100 | [diff] [blame] | 965 | |
| 966 | return 0; |
| 967 | |
| 968 | missing_ie: |
| 969 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_MISSING); |
| 970 | GTP_LOGPKG(LOGL_ERROR, peer, pack, len, |
| 971 | "Missing mandatory IE\n"); |
| 972 | /* TODO: Send response with cause */ |
| 973 | return -EINVAL; |
| 974 | } |
| 975 | |
| 976 | static bool is_ext_ua(const struct pdp_t *pdp) |
| 977 | { |
| 978 | return pdp->eua.l > 0 && pdp->eua.v[0] == PDP_EUA_TYPE_v4v6; |
| 979 | } |
| 980 | |
| 981 | static int gtp_pdp_ctx(uint8_t *buf, unsigned int size, const struct pdp_t *pdp, uint16_t sapi) |
| 982 | { |
| 983 | uint32_t tmp32; |
| 984 | uint16_t tmp16; |
| 985 | uint8_t *ptr = buf; |
| 986 | #define CHECK_SPACE_ERR(bytes) \ |
| 987 | if ((ptr - buf) + (bytes) > size) { \ |
| 988 | printf("Failed size check: %lu + %lu > %lu\n", (ptr- buf), bytes, size); \ |
| 989 | return -1; \ |
| 990 | } |
| 991 | #define MEMCPY_CHK(dst, src, len) \ |
| 992 | CHECK_SPACE_ERR((len)) \ |
| 993 | memcpy((dst), (uint8_t *)(src), (len)); \ |
| 994 | (dst) += (len); |
| 995 | |
| 996 | // Flags - FIXME: No ASI |
| 997 | *ptr++ = (is_ext_ua(pdp) << 7) | ((!!pdp->vplmn_allow) << 6) | ((!!pdp->reorder) << 4) | (pdp->nsapi & 0x0f); |
| 998 | // SAPI |
| 999 | *ptr++ = sapi & 0x0f; |
| 1000 | |
| 1001 | // QoS Sub |
| 1002 | if (pdp->qos_sub.l < 4) { |
| 1003 | /* Work around qos_sub never being set */ |
| 1004 | *ptr++ = 4; |
| 1005 | *ptr++ = 0; |
| 1006 | *ptr++ = 0x23; |
| 1007 | *ptr++ = 0x02; |
| 1008 | *ptr++ = 0x00; |
| 1009 | } else { |
| 1010 | *ptr++ = pdp->qos_sub.l; |
| 1011 | MEMCPY_CHK(ptr, pdp->qos_sub.v, pdp->qos_sub.l); |
| 1012 | } |
| 1013 | // QoS Req |
| 1014 | *ptr++ = pdp->qos_req.l; |
| 1015 | MEMCPY_CHK(ptr, pdp->qos_req.v, pdp->qos_req.l); |
| 1016 | // QoS Neg |
| 1017 | *ptr++ = pdp->qos_neg.l; |
| 1018 | MEMCPY_CHK(ptr, pdp->qos_neg.v, pdp->qos_neg.l); |
| 1019 | |
| 1020 | // SND |
| 1021 | tmp16 = osmo_htons(pdp->pdcpsndd); |
| 1022 | MEMCPY_CHK(ptr, &tmp16, sizeof(tmp16)); |
| 1023 | // SNU |
| 1024 | tmp16 = osmo_htons(pdp->pdcpsndu); |
| 1025 | MEMCPY_CHK(ptr, &tmp16, sizeof(tmp16)); |
| 1026 | // Send N-PDU |
| 1027 | *ptr++ = pdp->gtpsntx; |
| 1028 | // Recv N-PDU |
| 1029 | *ptr++ = pdp->gtpsnrx; |
| 1030 | // Uplink TEIC |
| 1031 | tmp32 = osmo_htonl(pdp->teic_gn); |
| 1032 | MEMCPY_CHK(ptr, &tmp32, sizeof(tmp32)); |
| 1033 | // Uplink TEIDI |
| 1034 | tmp32 = osmo_htonl(pdp->teid_gn); |
| 1035 | MEMCPY_CHK(ptr, &tmp32, sizeof(tmp32)); |
| 1036 | // PDP Ctx Id |
| 1037 | *ptr++ = pdp->pdp_id; |
| 1038 | // PDP Type Org |
| 1039 | *ptr++ = PDP_EUA_ORG_IETF; |
Daniel Willmann | 54fcd64 | 2024-03-06 11:53:37 +0100 | [diff] [blame] | 1040 | |
Daniel Willmann | 6536376 | 2024-01-26 16:36:20 +0100 | [diff] [blame] | 1041 | // PDP Type No. |
| 1042 | // PDP Address |
Daniel Willmann | 6536376 | 2024-01-26 16:36:20 +0100 | [diff] [blame] | 1043 | switch (pdp->eua.v[1]) { |
| 1044 | case PDP_EUA_TYPE_v4: |
| 1045 | case PDP_EUA_TYPE_v4v6: |
| 1046 | /* v4v6 expects an IPv4 addr first followed by an IPv6 addr*/ |
| 1047 | *ptr++ = PDP_EUA_TYPE_v4; |
| 1048 | if (pdp->eua.l < 6) |
| 1049 | return -1; |
| 1050 | *ptr++ = 4; |
| 1051 | MEMCPY_CHK(ptr, &pdp->eua.v[2], 4); |
| 1052 | break; |
| 1053 | case PDP_EUA_TYPE_v6: |
| 1054 | *ptr++ = PDP_EUA_TYPE_v6; |
| 1055 | if (pdp->eua.l < 18) |
| 1056 | return -1; |
| 1057 | *ptr++ = 16; |
| 1058 | MEMCPY_CHK(ptr, &pdp->eua.v[2], 16); |
| 1059 | break; |
| 1060 | default: |
| 1061 | return -EINVAL; |
| 1062 | //Panic |
| 1063 | } |
| 1064 | // GGSN Address Ctrl |
| 1065 | *ptr++ = pdp->gsnrc.l; |
| 1066 | MEMCPY_CHK(ptr, pdp->gsnrc.v, pdp->gsnrc.l); |
| 1067 | // GGSN Address User |
| 1068 | *ptr++ = pdp->gsnru.l; |
| 1069 | MEMCPY_CHK(ptr, pdp->gsnru.v, pdp->gsnru.l); |
| 1070 | // APN |
| 1071 | *ptr++ = pdp->apn_use.l; |
| 1072 | MEMCPY_CHK(ptr, pdp->apn_use.v, pdp->apn_use.l); |
| 1073 | // TransId |
| 1074 | *ptr++ = (pdp->ti >> 8) & 0x0f; |
| 1075 | *ptr++ = pdp->ti & 0xff; |
| 1076 | |
| 1077 | if (is_ext_ua(pdp)) { |
| 1078 | *ptr++ = PDP_EUA_TYPE_v6; |
| 1079 | if (pdp->eua.l < 22) |
| 1080 | return -1; |
| 1081 | *ptr++ = 16; |
| 1082 | MEMCPY_CHK(ptr, &pdp->eua.v[6], 16); |
| 1083 | } |
| 1084 | return ptr - buf; |
| 1085 | #undef CHECK_SPACE_ERR |
| 1086 | #undef MEMCPY_CHK |
| 1087 | } |
| 1088 | |
| 1089 | int gtp_sgsn_context_conf(struct gsn_t *gsn, struct sockaddr_in *peer, uint16_t seq, |
Daniel Willmann | 54fcd64 | 2024-03-06 11:53:37 +0100 | [diff] [blame] | 1090 | uint32_t teic, uint8_t cause, uint64_t imsi, const struct in_addr *sgsn_addr, struct pdp_t *pdpctx, uint16_t sapi, uint8_t *mmctx, int mm_len, void *cbp) |
Daniel Willmann | 6536376 | 2024-01-26 16:36:20 +0100 | [diff] [blame] | 1091 | { |
| 1092 | union gtp_packet packet; |
| 1093 | struct ul255_t pdp; |
| 1094 | |
| 1095 | /* GTP 1 is the highest supported protocol */ |
| 1096 | unsigned int length = get_default_gtp(1, GTP_SGSN_CONTEXT_RSP, &packet); |
| 1097 | |
| 1098 | // Cause - TV1 |
| 1099 | gtpie_tv1(&packet, &length, GTP_MAX, GTPIE_CAUSE, cause); |
Daniel Willmann | 54fcd64 | 2024-03-06 11:53:37 +0100 | [diff] [blame] | 1100 | |
| 1101 | if (cause != GTPCAUSE_ACC_REQ) |
| 1102 | return gtp_resp2(gsn, &packet, length, peer, gsn->fd1c, seq, 0, 0, teic); |
| 1103 | |
Daniel Willmann | 6536376 | 2024-01-26 16:36:20 +0100 | [diff] [blame] | 1104 | // IMSI - TV8 |
Daniel Willmann | 54fcd64 | 2024-03-06 11:53:37 +0100 | [diff] [blame] | 1105 | gtpie_tv8(&packet, &length, GTP_MAX, GTPIE_IMSI, imsi); |
Daniel Willmann | 6536376 | 2024-01-26 16:36:20 +0100 | [diff] [blame] | 1106 | |
| 1107 | // TEIC - TV4 |
| 1108 | gtpie_tv4(&packet, &length, GTP_MAX, GTPIE_TEI_C, pdpctx->teic_own); |
| 1109 | |
| 1110 | // MM Ctx - TLV |
Daniel Willmann | 54fcd64 | 2024-03-06 11:53:37 +0100 | [diff] [blame] | 1111 | gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_MM_CONTEXT, mm_len, mmctx); |
Daniel Willmann | 6536376 | 2024-01-26 16:36:20 +0100 | [diff] [blame] | 1112 | |
| 1113 | // PDP Ctx - TLV |
| 1114 | if (pdpctx) { |
| 1115 | int rc = gtp_pdp_ctx(pdp.v, 255, pdpctx, sapi); |
| 1116 | if (rc > 0) |
| 1117 | gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_PDP_CONTEXT, rc, pdp.v); |
| 1118 | } |
| 1119 | |
| 1120 | // SGSN Addr Ctrl - TLV |
| 1121 | gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_GSN_ADDR, 4, &sgsn_addr->s_addr); |
| 1122 | |
| 1123 | // Alt GGSN Addr Ctrl (per PDP Ctx) |
| 1124 | // Alt GGSN Addr User (per PDP Ctx) |
| 1125 | /* The encoding for this is a bit insane */ |
| 1126 | |
| 1127 | return gtp_resp2(gsn, &packet, length, peer, gsn->fd1c, seq, 0, 0, teic); |
| 1128 | } |
| 1129 | |
| 1130 | /* Handle an SGSN Context Response */ |
| 1131 | static int gtp_sgsn_context_conf_ind(struct gsn_t *gsn, int version, struct sockaddr_in *peer, |
| 1132 | void *pack, unsigned len) |
| 1133 | { |
| 1134 | /** If cause is "Request accepted": Send ACK, |
| 1135 | else: Log and handle error */ |
| 1136 | |
| 1137 | /* Check if we have a context with TLLI/P-TMSI/IMSI in the RAI */ |
| 1138 | |
| 1139 | void *cbp = NULL; |
| 1140 | uint8_t type = 0; |
| 1141 | uint8_t cause; |
| 1142 | union gtpie_member *ie[GTPIE_SIZE]; |
| 1143 | struct pdp_t *pdp = NULL; |
Daniel Willmann | 6536376 | 2024-01-26 16:36:20 +0100 | [diff] [blame] | 1144 | uint32_t teic; |
| 1145 | struct ul16_t sgsn_addr; |
| 1146 | |
| 1147 | if (version != 1) { |
| 1148 | LOGP(DLGTP, LOGL_NOTICE, |
| 1149 | "SGSN Context Request expected only on GTPCv1: %u\n", version); |
| 1150 | return -EINVAL; |
| 1151 | } |
| 1152 | |
| 1153 | int hlen = get_hlen(pack); |
| 1154 | |
| 1155 | /* Remove packet from queue */ |
| 1156 | if (gtp_conf(gsn, version, peer, pack, len, &type, &cbp)) |
| 1157 | return EOF; |
| 1158 | |
| 1159 | /* Extract information elements into a pointer array */ |
| 1160 | if (gtpie_decaps(ie, version, pack + hlen, len - hlen)) { |
| 1161 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_INVALID); |
| 1162 | GTP_LOGPKG(LOGL_ERROR, peer, pack, len, |
| 1163 | "Invalid message format\n"); |
| 1164 | if (gsn->cb_conf) |
| 1165 | gsn->cb_conf(type, EOF, NULL, cbp); |
| 1166 | return EOF; |
| 1167 | } |
| 1168 | |
| 1169 | /* Extract cause value (mandatory) */ |
| 1170 | if (gtpie_gettv1(ie, GTPIE_CAUSE, 0, &cause)) { |
| 1171 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_MISSING); |
| 1172 | GTP_LOGPKG(LOGL_ERROR, peer, pack, len, |
| 1173 | "Missing mandatory information field\n"); |
| 1174 | if (gsn->cb_conf) |
| 1175 | gsn->cb_conf(type, EOF, NULL, cbp); |
| 1176 | return EOF; |
| 1177 | } |
| 1178 | |
| 1179 | /* Check all conditional information elements */ |
| 1180 | if (!gtp_cause_successful(cause)) { |
| 1181 | GTP_LOGPKG(LOGL_NOTICE, peer, pack, len, |
| 1182 | "SGSN Context response with cause (%u)\n", cause); |
| 1183 | if (gsn->cb_conf) |
| 1184 | gsn->cb_conf(type, cause, NULL, cbp); |
| 1185 | } |
| 1186 | |
| 1187 | /* Gather UE context and PDP data, create pdp context */ |
| 1188 | //gtp_pdp_newpdp(gsn, &pdp, imsi, nsapi, NULL) |
| 1189 | if (gsn->cb_conf) |
| 1190 | gsn->cb_conf(type, cause, pdp, cbp); |
| 1191 | |
| 1192 | return 0; |
| 1193 | } |
| 1194 | |
| 1195 | /* Handle an SGSN Context Acknowledge */ |
| 1196 | static int gtp_sgsn_context_ack(struct gsn_t *gsn, int version, struct sockaddr_in *peer, |
| 1197 | void *pack, unsigned len) |
| 1198 | { |
| 1199 | /* If cause is != Request accepted, log error */ |
| 1200 | return -ENOTSUP; |
| 1201 | } |
| 1202 | |
| 1203 | /* Handle an SGSN Context request */ |
| 1204 | int gtp_context_request(struct gsn_t *gsn, int version, struct sockaddr_in *peer, |
| 1205 | void *pack, unsigned len) |
| 1206 | { |
| 1207 | union gtpie_member *ie[GTPIE_SIZE]; |
| 1208 | |
| 1209 | if (version != 1) { |
| 1210 | LOGP(DLGTP, LOGL_NOTICE, |
| 1211 | "SGSN Context Request expected only on GTPCv1: %u\n", version); |
| 1212 | return -EINVAL; |
| 1213 | } |
| 1214 | |
| 1215 | int hlen = get_hlen(pack); |
| 1216 | |
| 1217 | /* Decode information elements */ |
| 1218 | if (gtpie_decaps(ie, version, pack + hlen, len - hlen)) { |
| 1219 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_INVALID); |
| 1220 | GTP_LOGPKG(LOGL_ERROR, peer, pack, len, |
| 1221 | "Invalid message format (AN Information Relay)\n"); |
| 1222 | return -EINVAL; |
| 1223 | } |
| 1224 | |
| 1225 | if (gsn->cb_ran_info_relay_ind) |
| 1226 | gsn->cb_ran_info_relay_ind(peer, ie); |
| 1227 | |
| 1228 | return 0; |
| 1229 | } |
| 1230 | |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 1231 | /* *********************************************************** |
| 1232 | * Session management messages |
| 1233 | * Messages: create, update and delete PDP context |
| 1234 | * |
| 1235 | * Information storage |
Pau Espin Pedrol | 732131d | 2018-01-25 17:23:09 +0100 | [diff] [blame] | 1236 | * Information storage for each PDP context is defined in |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 1237 | * 23.060 section 13.3. Includes IMSI, MSISDN, APN, PDP-type, |
| 1238 | * PDP-address (IP address), sequence numbers, charging ID. |
| 1239 | * For the SGSN it also includes radio related mobility |
| 1240 | * information. |
| 1241 | *************************************************************/ |
| 1242 | |
Harald Welte | 7b3347b | 2010-05-15 12:18:46 +0200 | [diff] [blame] | 1243 | /* API: Send Create PDP Context Request (7.3.1) */ |
Pau Espin Pedrol | 7b38af5 | 2018-01-25 18:35:33 +0100 | [diff] [blame] | 1244 | int gtp_create_context_req(struct gsn_t *gsn, struct pdp_t *pdp, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1245 | void *cbp) |
| 1246 | { |
| 1247 | union gtp_packet packet; |
| 1248 | unsigned int length = |
| 1249 | get_default_gtp(pdp->version, GTP_CREATE_PDP_REQ, &packet); |
| 1250 | struct pdp_t *linked_pdp = NULL; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 1251 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1252 | /* TODO: Secondary PDP Context Activation Procedure */ |
| 1253 | /* In secondary activation procedure the PDP context is identified |
| 1254 | by tei in the header. The following fields are omitted: Selection |
| 1255 | mode, IMSI, MSISDN, End User Address, Access Point Name and |
| 1256 | Protocol Configuration Options */ |
jjako | 2c38133 | 2003-10-21 19:09:53 +0000 | [diff] [blame] | 1257 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1258 | if (pdp->secondary) { |
Pau Espin Pedrol | 9fbcb10 | 2019-05-31 16:29:32 +0200 | [diff] [blame] | 1259 | if (gtp_pdp_getgtp1(gsn, &linked_pdp, pdp->teic_own)) { |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 1260 | LOGP(DLGTP, LOGL_ERROR, |
Holger Hans Peter Freyther | 01b40d0 | 2014-12-04 15:01:53 +0100 | [diff] [blame] | 1261 | "Unknown linked PDP context: %u\n", pdp->teic_own); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1262 | return EOF; |
| 1263 | } |
| 1264 | } |
jjako | 2c38133 | 2003-10-21 19:09:53 +0000 | [diff] [blame] | 1265 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1266 | if (pdp->version == 0) { |
| 1267 | gtpie_tv0(&packet, &length, GTP_MAX, GTPIE_QOS_PROFILE0, |
| 1268 | sizeof(pdp->qos_req0), pdp->qos_req0); |
| 1269 | } |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 1270 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1271 | /* Section 7.7.2 */ |
| 1272 | if (pdp->version == 1) { |
| 1273 | if (!pdp->secondary) /* Not Secondary PDP Context Activation Procedure */ |
| 1274 | gtpie_tv0(&packet, &length, GTP_MAX, GTPIE_IMSI, |
| 1275 | sizeof(pdp->imsi), (uint8_t *) & pdp->imsi); |
| 1276 | } |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 1277 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1278 | /* Section 7.7.3 Routing Area Information */ |
| 1279 | if (pdp->rai_given == 1) |
| 1280 | gtpie_tv0(&packet, &length, GTP_MAX, GTPIE_RAI, |
| 1281 | pdp->rai.l, (uint8_t *) & pdp->rai.v); |
Harald Welte | 41af569 | 2011-10-07 18:42:34 +0200 | [diff] [blame] | 1282 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1283 | /* Section 7.7.11 */ |
| 1284 | if (pdp->norecovery_given == 0) |
| 1285 | gtpie_tv1(&packet, &length, GTP_MAX, GTPIE_RECOVERY, |
| 1286 | gsn->restart_counter); |
Harald Welte | 41af569 | 2011-10-07 18:42:34 +0200 | [diff] [blame] | 1287 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1288 | /* Section 7.7.12 */ |
| 1289 | if (!pdp->secondary) /* Not Secondary PDP Context Activation Procedure */ |
| 1290 | gtpie_tv1(&packet, &length, GTP_MAX, GTPIE_SELECTION_MODE, |
| 1291 | pdp->selmode); |
jjako | 2c38133 | 2003-10-21 19:09:53 +0000 | [diff] [blame] | 1292 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1293 | if (pdp->version == 0) { |
| 1294 | gtpie_tv2(&packet, &length, GTP_MAX, GTPIE_FL_DI, pdp->fllu); |
| 1295 | gtpie_tv2(&packet, &length, GTP_MAX, GTPIE_FL_C, pdp->fllc); |
| 1296 | } |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 1297 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1298 | /* Section 7.7.13 */ |
| 1299 | if (pdp->version == 1) { |
| 1300 | gtpie_tv4(&packet, &length, GTP_MAX, GTPIE_TEI_DI, |
| 1301 | pdp->teid_own); |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 1302 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1303 | /* Section 7.7.14 */ |
| 1304 | if (!pdp->teic_confirmed) |
| 1305 | gtpie_tv4(&packet, &length, GTP_MAX, GTPIE_TEI_C, |
| 1306 | pdp->teic_own); |
jjako | 2c38133 | 2003-10-21 19:09:53 +0000 | [diff] [blame] | 1307 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1308 | /* Section 7.7.17 */ |
| 1309 | gtpie_tv1(&packet, &length, GTP_MAX, GTPIE_NSAPI, pdp->nsapi); |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 1310 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1311 | /* Section 7.7.17 */ |
| 1312 | if (pdp->secondary) /* Secondary PDP Context Activation Procedure */ |
| 1313 | gtpie_tv1(&packet, &length, GTP_MAX, GTPIE_NSAPI, |
| 1314 | linked_pdp->nsapi); |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 1315 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1316 | /* Section 7.7.23 */ |
| 1317 | if (pdp->cch_pdp) /* Only include charging if flags are set */ |
| 1318 | gtpie_tv2(&packet, &length, GTP_MAX, GTPIE_CHARGING_C, |
| 1319 | pdp->cch_pdp); |
| 1320 | } |
jjako | 9b4971d | 2004-05-27 20:30:19 +0000 | [diff] [blame] | 1321 | |
Pau Espin Pedrol | 732131d | 2018-01-25 17:23:09 +0100 | [diff] [blame] | 1322 | /* TODO |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1323 | gtpie_tv2(&packet, &length, GTP_MAX, GTPIE_TRACE_REF, |
| 1324 | pdp->traceref); |
| 1325 | gtpie_tv2(&packet, &length, GTP_MAX, GTPIE_TRACE_TYPE, |
| 1326 | pdp->tracetype); */ |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 1327 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1328 | /* Section 7.7.27 */ |
| 1329 | if (!pdp->secondary) /* Not Secondary PDP Context Activation Procedure */ |
| 1330 | gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_EUA, |
| 1331 | pdp->eua.l, pdp->eua.v); |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 1332 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1333 | /* Section 7.7.30 */ |
| 1334 | if (!pdp->secondary) /* Not Secondary PDP Context Activation Procedure */ |
| 1335 | gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_APN, |
| 1336 | pdp->apn_use.l, pdp->apn_use.v); |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 1337 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1338 | /* Section 7.7.31 */ |
| 1339 | if (!pdp->secondary) /* Not Secondary PDP Context Activation Procedure */ |
| 1340 | if (pdp->pco_req.l) |
| 1341 | gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_PCO, |
| 1342 | pdp->pco_req.l, pdp->pco_req.v); |
jjako | 2c38133 | 2003-10-21 19:09:53 +0000 | [diff] [blame] | 1343 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1344 | /* Section 7.7.32 */ |
| 1345 | gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_GSN_ADDR, |
| 1346 | pdp->gsnlc.l, pdp->gsnlc.v); |
| 1347 | /* Section 7.7.32 */ |
| 1348 | gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_GSN_ADDR, |
| 1349 | pdp->gsnlu.l, pdp->gsnlu.v); |
jjako | 2c38133 | 2003-10-21 19:09:53 +0000 | [diff] [blame] | 1350 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1351 | /* Section 7.7.33 */ |
| 1352 | if (!pdp->secondary) /* Not Secondary PDP Context Activation Procedure */ |
| 1353 | gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_MSISDN, |
| 1354 | pdp->msisdn.l, pdp->msisdn.v); |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 1355 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1356 | /* Section 7.7.34 */ |
| 1357 | if (pdp->version == 1) |
| 1358 | gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_QOS_PROFILE, |
| 1359 | pdp->qos_req.l, pdp->qos_req.v); |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 1360 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1361 | /* Section 7.7.36 */ |
| 1362 | if ((pdp->version == 1) && pdp->tft.l) |
| 1363 | gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_TFT, |
| 1364 | pdp->tft.l, pdp->tft.v); |
Yann BONNAMY | 944dce3 | 2010-10-29 17:07:44 +0200 | [diff] [blame] | 1365 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1366 | /* Section 7.7.41 */ |
| 1367 | if ((pdp->version == 1) && pdp->triggerid.l) |
| 1368 | gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_TRIGGER_ID, |
| 1369 | pdp->triggerid.l, pdp->triggerid.v); |
Yann BONNAMY | 944dce3 | 2010-10-29 17:07:44 +0200 | [diff] [blame] | 1370 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1371 | /* Section 7.7.42 */ |
| 1372 | if ((pdp->version == 1) && pdp->omcid.l) |
| 1373 | gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_OMC_ID, |
| 1374 | pdp->omcid.l, pdp->omcid.v); |
Yann BONNAMY | 944dce3 | 2010-10-29 17:07:44 +0200 | [diff] [blame] | 1375 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1376 | /* new R7 fields */ |
| 1377 | if (pdp->rattype_given == 1) |
| 1378 | gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_RAT_TYPE, |
| 1379 | pdp->rattype.l, pdp->rattype.v); |
Yann BONNAMY | 944dce3 | 2010-10-29 17:07:44 +0200 | [diff] [blame] | 1380 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1381 | if (pdp->userloc_given == 1) |
| 1382 | gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_USER_LOC, |
| 1383 | pdp->userloc.l, pdp->userloc.v); |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 1384 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1385 | if (pdp->mstz_given == 1) |
| 1386 | gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_MS_TZ, |
| 1387 | pdp->mstz.l, pdp->mstz.v); |
| 1388 | |
| 1389 | if (pdp->imeisv_given == 1) |
| 1390 | gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_IMEI_SV, |
| 1391 | pdp->imeisv.l, pdp->imeisv.v); |
| 1392 | |
| 1393 | /* TODO hisaddr0 */ |
| 1394 | gtp_req(gsn, pdp->version, pdp, &packet, length, &pdp->hisaddr0, cbp); |
| 1395 | |
| 1396 | return 0; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 1397 | } |
| 1398 | |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 1399 | /* API: Application response to context indication */ |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1400 | int gtp_create_context_resp(struct gsn_t *gsn, struct pdp_t *pdp, int cause) |
| 1401 | { |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 1402 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1403 | /* Now send off a reply to the peer */ |
| 1404 | gtp_create_pdp_resp(gsn, pdp->version, pdp, cause); |
| 1405 | |
Daniel Willmann | 6a2e825 | 2023-11-23 18:41:59 +0100 | [diff] [blame] | 1406 | if (!gtp_cause_successful(cause)) |
Pau Espin Pedrol | d950134 | 2019-08-21 15:24:29 +0200 | [diff] [blame] | 1407 | gtp_freepdp(gsn, pdp); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1408 | |
| 1409 | return 0; |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 1410 | } |
| 1411 | |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 1412 | /* Send Create PDP Context Response */ |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1413 | int gtp_create_pdp_resp(struct gsn_t *gsn, int version, struct pdp_t *pdp, |
| 1414 | uint8_t cause) |
| 1415 | { |
| 1416 | union gtp_packet packet; |
| 1417 | unsigned int length = |
| 1418 | get_default_gtp(version, GTP_CREATE_PDP_RSP, &packet); |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 1419 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1420 | gtpie_tv1(&packet, &length, GTP_MAX, GTPIE_CAUSE, cause); |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 1421 | |
Daniel Willmann | 6a2e825 | 2023-11-23 18:41:59 +0100 | [diff] [blame] | 1422 | if (gtp_cause_successful(cause)) { |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 1423 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1424 | if (version == 0) |
| 1425 | gtpie_tv0(&packet, &length, GTP_MAX, GTPIE_QOS_PROFILE0, |
| 1426 | sizeof(pdp->qos_neg0), pdp->qos_neg0); |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 1427 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1428 | gtpie_tv1(&packet, &length, GTP_MAX, GTPIE_REORDER, |
| 1429 | pdp->reorder); |
| 1430 | gtpie_tv1(&packet, &length, GTP_MAX, GTPIE_RECOVERY, |
| 1431 | gsn->restart_counter); |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 1432 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1433 | if (version == 0) { |
| 1434 | gtpie_tv2(&packet, &length, GTP_MAX, GTPIE_FL_DI, |
| 1435 | pdp->fllu); |
| 1436 | gtpie_tv2(&packet, &length, GTP_MAX, GTPIE_FL_C, |
| 1437 | pdp->fllc); |
| 1438 | } |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 1439 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1440 | if (version == 1) { |
| 1441 | gtpie_tv4(&packet, &length, GTP_MAX, GTPIE_TEI_DI, |
| 1442 | pdp->teid_own); |
| 1443 | gtpie_tv4(&packet, &length, GTP_MAX, GTPIE_TEI_C, |
| 1444 | pdp->teic_own); |
| 1445 | } |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 1446 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1447 | /* TODO: We use teic_own as charging ID */ |
| 1448 | gtpie_tv4(&packet, &length, GTP_MAX, GTPIE_CHARGING_ID, |
| 1449 | pdp->teic_own); |
jjako | 2c38133 | 2003-10-21 19:09:53 +0000 | [diff] [blame] | 1450 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1451 | gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_EUA, |
| 1452 | pdp->eua.l, pdp->eua.v); |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 1453 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1454 | if (pdp->pco_neg.l) { /* Optional PCO */ |
| 1455 | gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_PCO, |
| 1456 | pdp->pco_neg.l, pdp->pco_neg.v); |
| 1457 | } |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 1458 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1459 | gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_GSN_ADDR, |
| 1460 | pdp->gsnlc.l, pdp->gsnlc.v); |
| 1461 | gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_GSN_ADDR, |
| 1462 | pdp->gsnlu.l, pdp->gsnlu.v); |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 1463 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1464 | if (version == 1) |
| 1465 | gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_QOS_PROFILE, |
| 1466 | pdp->qos_neg.l, pdp->qos_neg.v); |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 1467 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1468 | /* TODO: Charging gateway address */ |
| 1469 | } |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 1470 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1471 | return gtp_resp(version, gsn, pdp, &packet, length, &pdp->sa_peer, |
| 1472 | pdp->fd, pdp->seq, pdp->tid); |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 1473 | } |
| 1474 | |
| 1475 | /* Handle Create PDP Context Request */ |
| 1476 | int gtp_create_pdp_ind(struct gsn_t *gsn, int version, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1477 | struct sockaddr_in *peer, int fd, |
| 1478 | void *pack, unsigned len) |
| 1479 | { |
| 1480 | struct pdp_t *pdp, *pdp_old; |
| 1481 | struct pdp_t pdp_buf; |
| 1482 | union gtpie_member *ie[GTPIE_SIZE]; |
| 1483 | uint8_t recovery; |
Pau Espin Pedrol | b5f9334 | 2018-07-23 11:24:07 +0200 | [diff] [blame] | 1484 | bool recovery_recvd = false; |
| 1485 | int rc; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 1486 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1487 | uint16_t seq = get_seq(pack); |
| 1488 | int hlen = get_hlen(pack); |
| 1489 | uint8_t linked_nsapi = 0; |
| 1490 | struct pdp_t *linked_pdp = NULL; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 1491 | |
Pau Espin Pedrol | de72d26 | 2019-05-29 18:17:05 +0200 | [diff] [blame] | 1492 | if (!gtp_duplicate(gsn, version, peer, seq)) |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1493 | return 0; |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 1494 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1495 | pdp = &pdp_buf; |
| 1496 | memset(pdp, 0, sizeof(struct pdp_t)); |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 1497 | |
Vadim Yanitskiy | 68c5a74 | 2019-08-30 21:04:19 +0200 | [diff] [blame] | 1498 | if (version == 0) |
| 1499 | pdp_set_imsi_nsapi(pdp, get_tid(pack)); |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 1500 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1501 | pdp->seq = seq; |
| 1502 | pdp->sa_peer = *peer; |
| 1503 | pdp->fd = fd; |
| 1504 | pdp->version = version; |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 1505 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1506 | /* Decode information elements */ |
| 1507 | if (gtpie_decaps(ie, version, pack + hlen, len - hlen)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 1508 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_INVALID); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 1509 | GTP_LOGPKG(LOGL_ERROR, peer, pack, len, |
| 1510 | "Invalid message format\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1511 | if (0 == version) |
| 1512 | return EOF; |
| 1513 | else |
| 1514 | return gtp_create_pdp_resp(gsn, version, pdp, |
| 1515 | GTPCAUSE_INVALID_MESSAGE); |
| 1516 | } |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 1517 | |
Pau Espin Pedrol | fb9303c | 2022-03-07 11:34:28 +0100 | [diff] [blame] | 1518 | switch (version) { |
| 1519 | case 1: |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1520 | /* Linked NSAPI (conditional) */ |
| 1521 | /* If included this is the Secondary PDP Context Activation Procedure */ |
| 1522 | /* In secondary activation IMSI is not included, so the context must be */ |
| 1523 | /* identified by the tei */ |
| 1524 | if (!gtpie_gettv1(ie, GTPIE_NSAPI, 1, &linked_nsapi)) { |
jjako | 2c38133 | 2003-10-21 19:09:53 +0000 | [diff] [blame] | 1525 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1526 | /* Find the primary PDP context */ |
Pau Espin Pedrol | 9fbcb10 | 2019-05-31 16:29:32 +0200 | [diff] [blame] | 1527 | if (gtp_pdp_getgtp1(gsn, &linked_pdp, get_tei(pack))) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 1528 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_INCORRECT); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 1529 | GTP_LOGPKG(LOGL_ERROR, peer, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1530 | pack, len, |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 1531 | "Incorrect optional information field\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1532 | return gtp_create_pdp_resp(gsn, version, pdp, |
| 1533 | GTPCAUSE_OPT_IE_INCORRECT); |
| 1534 | } |
jjako | 2c38133 | 2003-10-21 19:09:53 +0000 | [diff] [blame] | 1535 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1536 | /* Check that the primary PDP context matches linked nsapi */ |
| 1537 | if (linked_pdp->nsapi != linked_nsapi) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 1538 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_INCORRECT); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 1539 | GTP_LOGPKG(LOGL_ERROR, peer, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1540 | pack, len, |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 1541 | "Incorrect optional information field\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1542 | return gtp_create_pdp_resp(gsn, version, pdp, |
| 1543 | GTPCAUSE_OPT_IE_INCORRECT); |
| 1544 | } |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 1545 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1546 | /* Copy parameters from primary context */ |
| 1547 | pdp->selmode = linked_pdp->selmode; |
| 1548 | pdp->imsi = linked_pdp->imsi; |
| 1549 | pdp->msisdn = linked_pdp->msisdn; |
| 1550 | pdp->eua = linked_pdp->eua; |
| 1551 | pdp->pco_req = linked_pdp->pco_req; |
| 1552 | pdp->apn_req = linked_pdp->apn_req; |
| 1553 | pdp->teic_gn = linked_pdp->teic_gn; |
| 1554 | pdp->secondary = 1; |
Pau Espin Pedrol | aad77a0 | 2019-05-30 12:44:20 +0200 | [diff] [blame] | 1555 | } else { |
| 1556 | /* Not Secondary PDP Context Activation Procedure */ |
| 1557 | /* IMSI (conditional): If the MS is emergency attached |
| 1558 | and the MS is UICCless, the IMSI cannot be included |
| 1559 | in the message and therefore IMSI shall not be |
| 1560 | included in the message. */ |
| 1561 | if (gtpie_gettv0 |
| 1562 | (ie, GTPIE_IMSI, 0, &pdp->imsi, sizeof(pdp->imsi))) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 1563 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_MISSING); |
Pau Espin Pedrol | aad77a0 | 2019-05-30 12:44:20 +0200 | [diff] [blame] | 1564 | GTP_LOGPKG(LOGL_ERROR, peer, pack, |
| 1565 | len, "Missing IMSI not supported\n"); |
| 1566 | return gtp_create_pdp_resp(gsn, version, pdp, |
| 1567 | GTPCAUSE_MAN_IE_MISSING); |
| 1568 | } |
| 1569 | } |
| 1570 | |
| 1571 | /* TEID (mandatory) */ |
| 1572 | if (gtpie_gettv4(ie, GTPIE_TEI_DI, 0, &pdp->teid_gn)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 1573 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_MISSING); |
Pau Espin Pedrol | aad77a0 | 2019-05-30 12:44:20 +0200 | [diff] [blame] | 1574 | GTP_LOGPKG(LOGL_ERROR, peer, pack, |
| 1575 | len, "Missing mandatory information field\n"); |
| 1576 | return gtp_create_pdp_resp(gsn, version, pdp, |
| 1577 | GTPCAUSE_MAN_IE_MISSING); |
| 1578 | } |
| 1579 | /* TEIC (conditional) */ |
| 1580 | if (!linked_pdp) { /* Not Secondary PDP Context Activation Procedure */ |
| 1581 | if (gtpie_gettv4(ie, GTPIE_TEI_C, 0, &pdp->teic_gn)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 1582 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_MISSING); |
Pau Espin Pedrol | aad77a0 | 2019-05-30 12:44:20 +0200 | [diff] [blame] | 1583 | GTP_LOGPKG(LOGL_ERROR, peer, |
| 1584 | pack, len, |
| 1585 | "Missing mandatory information field\n"); |
| 1586 | return gtp_create_pdp_resp(gsn, version, pdp, |
| 1587 | GTPCAUSE_MAN_IE_MISSING); |
| 1588 | } |
| 1589 | } |
| 1590 | /* NSAPI (mandatory) */ |
| 1591 | if (gtpie_gettv1(ie, GTPIE_NSAPI, 0, &pdp->nsapi)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 1592 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_MISSING); |
Pau Espin Pedrol | aad77a0 | 2019-05-30 12:44:20 +0200 | [diff] [blame] | 1593 | GTP_LOGPKG(LOGL_ERROR, peer, pack, |
| 1594 | len, "Missing mandatory information field\n"); |
| 1595 | return gtp_create_pdp_resp(gsn, version, pdp, |
| 1596 | GTPCAUSE_MAN_IE_MISSING); |
| 1597 | } |
| 1598 | /* QoS (mandatory) */ |
| 1599 | if (gtpie_gettlv(ie, GTPIE_QOS_PROFILE, 0, &pdp->qos_req.l, |
| 1600 | &pdp->qos_req.v, sizeof(pdp->qos_req.v))) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 1601 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_MISSING); |
Pau Espin Pedrol | aad77a0 | 2019-05-30 12:44:20 +0200 | [diff] [blame] | 1602 | GTP_LOGPKG(LOGL_ERROR, peer, pack, |
| 1603 | len, "Missing mandatory information field\n"); |
| 1604 | return gtp_create_pdp_resp(gsn, version, pdp, |
| 1605 | GTPCAUSE_MAN_IE_MISSING); |
| 1606 | } |
| 1607 | /* TFT (conditional) */ |
| 1608 | if (gtpie_gettlv(ie, GTPIE_TFT, 0, &pdp->tft.l, |
| 1609 | &pdp->tft.v, sizeof(pdp->tft.v))) { |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1610 | } |
Pau Espin Pedrol | fb9303c | 2022-03-07 11:34:28 +0100 | [diff] [blame] | 1611 | break; /* version 1 */ |
| 1612 | |
| 1613 | case 0: |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1614 | if (gtpie_gettv0(ie, GTPIE_QOS_PROFILE0, 0, |
| 1615 | pdp->qos_req0, sizeof(pdp->qos_req0))) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 1616 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_MISSING); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 1617 | GTP_LOGPKG(LOGL_ERROR, peer, pack, |
| 1618 | len, "Missing mandatory information field\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1619 | return gtp_create_pdp_resp(gsn, version, pdp, |
| 1620 | GTPCAUSE_MAN_IE_MISSING); |
| 1621 | } |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1622 | if (gtpie_gettv2(ie, GTPIE_FL_DI, 0, &pdp->flru)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 1623 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_MISSING); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 1624 | GTP_LOGPKG(LOGL_ERROR, peer, pack, |
| 1625 | len, "Missing mandatory information field\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1626 | return gtp_create_pdp_resp(gsn, version, pdp, |
| 1627 | GTPCAUSE_MAN_IE_MISSING); |
| 1628 | } |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1629 | if (gtpie_gettv2(ie, GTPIE_FL_C, 0, &pdp->flrc)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 1630 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_MISSING); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 1631 | GTP_LOGPKG(LOGL_ERROR, peer, pack, |
| 1632 | len, "Missing mandatory information field\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1633 | return gtp_create_pdp_resp(gsn, version, pdp, |
| 1634 | GTPCAUSE_MAN_IE_MISSING); |
| 1635 | } |
Pau Espin Pedrol | fb9303c | 2022-03-07 11:34:28 +0100 | [diff] [blame] | 1636 | break; |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1637 | } |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 1638 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1639 | /* SGSN address for signalling (mandatory) */ |
| 1640 | if (gtpie_gettlv(ie, GTPIE_GSN_ADDR, 0, &pdp->gsnrc.l, |
| 1641 | &pdp->gsnrc.v, sizeof(pdp->gsnrc.v))) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 1642 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_MISSING); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 1643 | GTP_LOGPKG(LOGL_ERROR, peer, pack, len, |
| 1644 | "Missing mandatory information field\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1645 | return gtp_create_pdp_resp(gsn, version, pdp, |
| 1646 | GTPCAUSE_MAN_IE_MISSING); |
| 1647 | } |
jjako | 2e840a3 | 2003-01-28 16:05:18 +0000 | [diff] [blame] | 1648 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1649 | /* SGSN address for user traffic (mandatory) */ |
| 1650 | if (gtpie_gettlv(ie, GTPIE_GSN_ADDR, 1, &pdp->gsnru.l, |
| 1651 | &pdp->gsnru.v, sizeof(pdp->gsnru.v))) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 1652 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_MISSING); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 1653 | GTP_LOGPKG(LOGL_ERROR, peer, pack, len, |
| 1654 | "Missing mandatory information field\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1655 | return gtp_create_pdp_resp(gsn, version, pdp, |
| 1656 | GTPCAUSE_MAN_IE_MISSING); |
| 1657 | } |
Pau Espin Pedrol | aad77a0 | 2019-05-30 12:44:20 +0200 | [diff] [blame] | 1658 | /* Recovery (optional) */ |
| 1659 | if (!gtpie_gettv1(ie, GTPIE_RECOVERY, 0, &recovery)) { |
| 1660 | /* we use recovery futher down after announcing new pdp ctx to user */ |
| 1661 | recovery_recvd = true; |
| 1662 | } |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 1663 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1664 | if (!linked_pdp) { /* Not Secondary PDP Context Activation Procedure */ |
Pau Espin Pedrol | aad77a0 | 2019-05-30 12:44:20 +0200 | [diff] [blame] | 1665 | /* Selection mode (conditional) */ |
| 1666 | if (gtpie_gettv0(ie, GTPIE_SELECTION_MODE, 0, |
| 1667 | &pdp->selmode, sizeof(pdp->selmode))) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 1668 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_MISSING); |
Pau Espin Pedrol | aad77a0 | 2019-05-30 12:44:20 +0200 | [diff] [blame] | 1669 | GTP_LOGPKG(LOGL_ERROR, peer, pack, |
| 1670 | len, "Missing mandatory information field\n"); |
| 1671 | return gtp_create_pdp_resp(gsn, version, pdp, |
| 1672 | GTPCAUSE_MAN_IE_MISSING); |
| 1673 | } |
| 1674 | /* End User Address (conditional) */ |
| 1675 | if (gtpie_gettlv(ie, GTPIE_EUA, 0, &pdp->eua.l, |
| 1676 | &pdp->eua.v, sizeof(pdp->eua.v))) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 1677 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_MISSING); |
Pau Espin Pedrol | aad77a0 | 2019-05-30 12:44:20 +0200 | [diff] [blame] | 1678 | GTP_LOGPKG(LOGL_ERROR, peer, pack, |
| 1679 | len, "Missing mandatory information field\n"); |
| 1680 | return gtp_create_pdp_resp(gsn, version, pdp, |
| 1681 | GTPCAUSE_MAN_IE_MISSING); |
| 1682 | } |
| 1683 | /* APN */ |
| 1684 | if (gtpie_gettlv(ie, GTPIE_APN, 0, &pdp->apn_req.l, |
| 1685 | &pdp->apn_req.v, sizeof(pdp->apn_req.v))) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 1686 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_MISSING); |
Pau Espin Pedrol | aad77a0 | 2019-05-30 12:44:20 +0200 | [diff] [blame] | 1687 | GTP_LOGPKG(LOGL_ERROR, peer, pack, |
| 1688 | len, "Missing mandatory information field\n"); |
| 1689 | return gtp_create_pdp_resp(gsn, version, pdp, |
| 1690 | GTPCAUSE_MAN_IE_MISSING); |
| 1691 | } |
| 1692 | /* Extract protocol configuration options (optional) */ |
| 1693 | if (!gtpie_gettlv(ie, GTPIE_PCO, 0, &pdp->pco_req.l, |
| 1694 | &pdp->pco_req.v, sizeof(pdp->pco_req.v))) { |
| 1695 | } |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1696 | /* MSISDN (conditional) */ |
| 1697 | if (gtpie_gettlv(ie, GTPIE_MSISDN, 0, &pdp->msisdn.l, |
| 1698 | &pdp->msisdn.v, sizeof(pdp->msisdn.v))) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 1699 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_MISSING); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 1700 | GTP_LOGPKG(LOGL_ERROR, peer, pack, |
| 1701 | len, "Missing mandatory information field\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1702 | return gtp_create_pdp_resp(gsn, version, pdp, |
| 1703 | GTPCAUSE_MAN_IE_MISSING); |
| 1704 | } |
| 1705 | } |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 1706 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1707 | /* Initialize our own IP addresses */ |
Oliver Smith | 9bd2711 | 2024-02-22 16:02:37 +0100 | [diff] [blame] | 1708 | in_addr2gsna(&pdp->gsnlc, &gsn->gsnc); |
| 1709 | in_addr2gsna(&pdp->gsnlu, &gsn->gsnu); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1710 | |
Pau Espin Pedrol | 9fbcb10 | 2019-05-31 16:29:32 +0200 | [diff] [blame] | 1711 | if (!gtp_pdp_getimsi(gsn, &pdp_old, pdp->imsi, pdp->nsapi)) { |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1712 | /* Found old pdp with same tid. Now the voodoo begins! */ |
| 1713 | /* 09.60 / 29.060 allows create on existing context to "steal" */ |
| 1714 | /* the context which was allready established */ |
| 1715 | /* We check that the APN, selection mode and MSISDN is the same */ |
Holger Hans Peter Freyther | 01b40d0 | 2014-12-04 15:01:53 +0100 | [diff] [blame] | 1716 | DEBUGP(DLGTP, "gtp_create_pdp_ind: Old context found\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1717 | if ((pdp->apn_req.l == pdp_old->apn_req.l) |
| 1718 | && |
| 1719 | (!memcmp |
| 1720 | (pdp->apn_req.v, pdp_old->apn_req.v, pdp->apn_req.l)) |
| 1721 | && (pdp->selmode == pdp_old->selmode) |
| 1722 | && (pdp->msisdn.l == pdp_old->msisdn.l) |
| 1723 | && |
| 1724 | (!memcmp(pdp->msisdn.v, pdp_old->msisdn.v, pdp->msisdn.l))) |
| 1725 | { |
| 1726 | /* OK! We are dealing with the same APN. We will copy new |
Pau Espin Pedrol | 732131d | 2018-01-25 17:23:09 +0100 | [diff] [blame] | 1727 | * parameters to the old pdp and send off confirmation |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1728 | * We ignore the following information elements: |
| 1729 | * QoS: MS will get originally negotiated QoS. |
| 1730 | * End user address (EUA). MS will get old EUA anyway. |
| 1731 | * Protocol configuration option (PCO): Only application can verify */ |
Pau Espin Pedrol | 674a912 | 2022-03-07 12:44:11 +0100 | [diff] [blame] | 1732 | DEBUGP(DLGTP, "gtp_create_pdp_ind: Reusing old context\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1733 | |
| 1734 | /* Copy remote flow label */ |
| 1735 | pdp_old->flru = pdp->flru; |
| 1736 | pdp_old->flrc = pdp->flrc; |
| 1737 | |
| 1738 | /* Copy remote tei */ |
| 1739 | pdp_old->teid_gn = pdp->teid_gn; |
| 1740 | pdp_old->teic_gn = pdp->teic_gn; |
| 1741 | |
| 1742 | /* Copy peer GSN address */ |
| 1743 | pdp_old->gsnrc.l = pdp->gsnrc.l; |
| 1744 | memcpy(&pdp_old->gsnrc.v, &pdp->gsnrc.v, pdp->gsnrc.l); |
| 1745 | pdp_old->gsnru.l = pdp->gsnru.l; |
| 1746 | memcpy(&pdp_old->gsnru.v, &pdp->gsnru.v, pdp->gsnru.l); |
| 1747 | |
| 1748 | /* Copy request parameters */ |
| 1749 | pdp_old->seq = pdp->seq; |
| 1750 | pdp_old->sa_peer = pdp->sa_peer; |
| 1751 | pdp_old->fd = pdp->fd = fd; |
| 1752 | pdp_old->version = pdp->version = version; |
| 1753 | |
| 1754 | /* Switch to using the old pdp context */ |
| 1755 | pdp = pdp_old; |
| 1756 | |
Pau Espin Pedrol | b5f9334 | 2018-07-23 11:24:07 +0200 | [diff] [blame] | 1757 | if (recovery_recvd) |
| 1758 | emit_cb_recovery(gsn, peer, pdp, recovery); |
| 1759 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1760 | /* Confirm to peer that things were "successful" */ |
| 1761 | return gtp_create_pdp_resp(gsn, version, pdp, |
| 1762 | GTPCAUSE_ACC_REQ); |
| 1763 | } else { /* This is not the same PDP context. Delete the old one. */ |
| 1764 | |
Holger Hans Peter Freyther | 01b40d0 | 2014-12-04 15:01:53 +0100 | [diff] [blame] | 1765 | DEBUGP(DLGTP, "gtp_create_pdp_ind: Deleting old context\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1766 | |
Pau Espin Pedrol | 0d0b059 | 2019-05-29 20:42:09 +0200 | [diff] [blame] | 1767 | gtp_freepdp(gsn, pdp_old); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1768 | |
Holger Hans Peter Freyther | 01b40d0 | 2014-12-04 15:01:53 +0100 | [diff] [blame] | 1769 | DEBUGP(DLGTP, "gtp_create_pdp_ind: Deleted...\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1770 | } |
| 1771 | } |
| 1772 | |
Pau Espin Pedrol | 9b288b7 | 2022-02-28 13:58:51 +0100 | [diff] [blame] | 1773 | rc = gtp_pdp_newpdp(gsn, &pdp, pdp->imsi, pdp->nsapi, pdp); |
| 1774 | if (rc != 0) { |
| 1775 | GTP_LOGPKG(LOGL_ERROR, peer, pack, len, |
| 1776 | "Failed creating a new PDP context, array full (%u)\n", PDP_MAX); |
| 1777 | /* &pdp in gtp_pdp_newpdp is untouched if it failed: */ |
| 1778 | rc = gtp_create_pdp_resp(gsn, version, pdp, GTPCAUSE_NO_MEMORY); |
| 1779 | /* Don't pass it to emit_cb_recovery, since allocation failed and it was already rejected: */ |
| 1780 | pdp = NULL; |
| 1781 | goto recover_ret; |
| 1782 | } |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1783 | |
Pau Espin Pedrol | aad77a0 | 2019-05-30 12:44:20 +0200 | [diff] [blame] | 1784 | /* Callback function to validate login */ |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1785 | if (gsn->cb_create_context_ind != 0) |
Pau Espin Pedrol | b5f9334 | 2018-07-23 11:24:07 +0200 | [diff] [blame] | 1786 | rc = gsn->cb_create_context_ind(pdp); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1787 | else { |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 1788 | GTP_LOGPKG(LOGL_ERROR, peer, pack, len, |
| 1789 | "No create_context_ind callback defined\n"); |
Pau Espin Pedrol | b5f9334 | 2018-07-23 11:24:07 +0200 | [diff] [blame] | 1790 | rc = gtp_create_pdp_resp(gsn, version, pdp, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1791 | GTPCAUSE_NOT_SUPPORTED); |
| 1792 | } |
Pau Espin Pedrol | 9b288b7 | 2022-02-28 13:58:51 +0100 | [diff] [blame] | 1793 | |
| 1794 | recover_ret: |
Pau Espin Pedrol | b5f9334 | 2018-07-23 11:24:07 +0200 | [diff] [blame] | 1795 | if (recovery_recvd) |
| 1796 | emit_cb_recovery(gsn, peer, pdp, recovery); |
| 1797 | return rc; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 1798 | } |
| 1799 | |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 1800 | /* Handle Create PDP Context Response */ |
| 1801 | int gtp_create_pdp_conf(struct gsn_t *gsn, int version, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1802 | struct sockaddr_in *peer, void *pack, unsigned len) |
| 1803 | { |
| 1804 | struct pdp_t *pdp; |
| 1805 | union gtpie_member *ie[GTPIE_SIZE]; |
| 1806 | uint8_t cause, recovery; |
| 1807 | void *cbp = NULL; |
| 1808 | uint8_t type = 0; |
| 1809 | int hlen = get_hlen(pack); |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 1810 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1811 | /* Remove packet from queue */ |
| 1812 | if (gtp_conf(gsn, version, peer, pack, len, &type, &cbp)) |
| 1813 | return EOF; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 1814 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1815 | /* Find the context in question */ |
Pau Espin Pedrol | 9fbcb10 | 2019-05-31 16:29:32 +0200 | [diff] [blame] | 1816 | if (gtp_pdp_getgtp1(gsn, &pdp, get_tei(pack))) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 1817 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_ERR_UNKNOWN_PDP); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 1818 | GTP_LOGPKG(LOGL_ERROR, peer, pack, len, |
Holger Hans Peter Freyther | 01b40d0 | 2014-12-04 15:01:53 +0100 | [diff] [blame] | 1819 | "Unknown PDP context: %u\n", get_tei(pack)); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1820 | if (gsn->cb_conf) |
| 1821 | gsn->cb_conf(type, EOF, NULL, cbp); |
| 1822 | return EOF; |
| 1823 | } |
jjako | 2c38133 | 2003-10-21 19:09:53 +0000 | [diff] [blame] | 1824 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1825 | /* Decode information elements */ |
| 1826 | if (gtpie_decaps(ie, version, pack + hlen, len - hlen)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 1827 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_INVALID); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 1828 | GTP_LOGPKG(LOGL_ERROR, peer, pack, len, |
| 1829 | "Invalid message format\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1830 | if (gsn->cb_conf) |
| 1831 | gsn->cb_conf(type, EOF, pdp, cbp); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1832 | return EOF; |
| 1833 | } |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 1834 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1835 | /* Extract cause value (mandatory) */ |
| 1836 | if (gtpie_gettv1(ie, GTPIE_CAUSE, 0, &cause)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 1837 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_MISSING); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 1838 | GTP_LOGPKG(LOGL_ERROR, peer, pack, len, |
| 1839 | "Missing mandatory information field\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1840 | if (gsn->cb_conf) |
| 1841 | gsn->cb_conf(type, EOF, pdp, cbp); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1842 | return EOF; |
| 1843 | } |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 1844 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1845 | /* Extract recovery (optional) */ |
| 1846 | if (!gtpie_gettv1(ie, GTPIE_RECOVERY, 0, &recovery)) { |
Pau Espin Pedrol | b5f9334 | 2018-07-23 11:24:07 +0200 | [diff] [blame] | 1847 | emit_cb_recovery(gsn, peer, pdp, recovery); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1848 | } |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 1849 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1850 | /* Extract protocol configuration options (optional) */ |
| 1851 | if (!gtpie_gettlv(ie, GTPIE_PCO, 0, &pdp->pco_req.l, |
| 1852 | &pdp->pco_req.v, sizeof(pdp->pco_req.v))) { |
| 1853 | } |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 1854 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1855 | /* Check all conditional information elements */ |
Daniel Willmann | 6a2e825 | 2023-11-23 18:41:59 +0100 | [diff] [blame] | 1856 | if (gtp_cause_successful(cause)) { |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 1857 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1858 | if (version == 0) { |
| 1859 | if (gtpie_gettv0(ie, GTPIE_QOS_PROFILE0, 0, |
| 1860 | &pdp->qos_neg0, |
| 1861 | sizeof(pdp->qos_neg0))) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 1862 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_MISSING); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 1863 | GTP_LOGPKG(LOGL_ERROR, peer, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1864 | pack, len, |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 1865 | "Missing conditional information field\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1866 | if (gsn->cb_conf) |
| 1867 | gsn->cb_conf(type, EOF, pdp, cbp); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1868 | return EOF; |
| 1869 | } |
| 1870 | } |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 1871 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1872 | if (gtpie_gettv1(ie, GTPIE_REORDER, 0, &pdp->reorder)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 1873 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_MISSING); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 1874 | GTP_LOGPKG(LOGL_ERROR, peer, pack, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1875 | len, |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 1876 | "Missing conditional information field\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1877 | if (gsn->cb_conf) |
| 1878 | gsn->cb_conf(type, EOF, pdp, cbp); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1879 | return EOF; |
| 1880 | } |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 1881 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1882 | if (version == 0) { |
| 1883 | if (gtpie_gettv2(ie, GTPIE_FL_DI, 0, &pdp->flru)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 1884 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_MISSING); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 1885 | GTP_LOGPKG(LOGL_ERROR, peer, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1886 | pack, len, |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 1887 | "Missing conditional information field\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1888 | if (gsn->cb_conf) |
| 1889 | gsn->cb_conf(type, EOF, pdp, cbp); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1890 | return EOF; |
| 1891 | } |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 1892 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1893 | if (gtpie_gettv2(ie, GTPIE_FL_C, 0, &pdp->flrc)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 1894 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_MISSING); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 1895 | GTP_LOGPKG(LOGL_ERROR, peer, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1896 | pack, len, |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 1897 | "Missing conditional information field\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1898 | if (gsn->cb_conf) |
| 1899 | gsn->cb_conf(type, EOF, pdp, cbp); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1900 | return EOF; |
| 1901 | } |
| 1902 | } |
| 1903 | |
| 1904 | if (version == 1) { |
| 1905 | if (gtpie_gettv4(ie, GTPIE_TEI_DI, 0, &pdp->teid_gn)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 1906 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_MISSING); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 1907 | GTP_LOGPKG(LOGL_ERROR, peer, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1908 | pack, len, |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 1909 | "Missing conditional information field\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1910 | if (gsn->cb_conf) |
| 1911 | gsn->cb_conf(type, EOF, pdp, cbp); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1912 | return EOF; |
| 1913 | } |
| 1914 | |
| 1915 | if (gtpie_gettv4(ie, GTPIE_TEI_C, 0, &pdp->teic_gn)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 1916 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_MISSING); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 1917 | GTP_LOGPKG(LOGL_ERROR, peer, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1918 | pack, len, |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 1919 | "Missing conditional information field\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1920 | if (gsn->cb_conf) |
| 1921 | gsn->cb_conf(type, EOF, pdp, cbp); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1922 | return EOF; |
| 1923 | } |
Pau Espin Pedrol | 0b1d9db | 2021-04-21 19:45:23 +0200 | [diff] [blame] | 1924 | /* Register that we have received a valid teic from GGSN */ |
| 1925 | pdp->teic_confirmed = 1; |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1926 | } |
| 1927 | |
| 1928 | if (gtpie_gettv4(ie, GTPIE_CHARGING_ID, 0, &pdp->cid)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 1929 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_MISSING); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 1930 | GTP_LOGPKG(LOGL_ERROR, peer, pack, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1931 | len, |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 1932 | "Missing conditional information field\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1933 | if (gsn->cb_conf) |
| 1934 | gsn->cb_conf(type, EOF, pdp, cbp); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1935 | } |
| 1936 | |
| 1937 | if (gtpie_gettlv(ie, GTPIE_EUA, 0, &pdp->eua.l, |
| 1938 | &pdp->eua.v, sizeof(pdp->eua.v))) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 1939 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_MISSING); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 1940 | GTP_LOGPKG(LOGL_ERROR, peer, pack, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1941 | len, |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 1942 | "Missing conditional information field\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1943 | if (gsn->cb_conf) |
| 1944 | gsn->cb_conf(type, EOF, pdp, cbp); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1945 | return EOF; |
| 1946 | } |
| 1947 | |
| 1948 | if (gtpie_gettlv(ie, GTPIE_GSN_ADDR, 0, &pdp->gsnrc.l, |
| 1949 | &pdp->gsnrc.v, sizeof(pdp->gsnrc.v))) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 1950 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_MISSING); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 1951 | GTP_LOGPKG(LOGL_ERROR, peer, pack, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1952 | len, |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 1953 | "Missing conditional information field\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1954 | if (gsn->cb_conf) |
| 1955 | gsn->cb_conf(type, EOF, pdp, cbp); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1956 | return EOF; |
| 1957 | } |
| 1958 | |
| 1959 | if (gtpie_gettlv(ie, GTPIE_GSN_ADDR, 1, &pdp->gsnru.l, |
| 1960 | &pdp->gsnru.v, sizeof(pdp->gsnru.v))) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 1961 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_MISSING); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 1962 | GTP_LOGPKG(LOGL_ERROR, peer, pack, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1963 | len, |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 1964 | "Missing conditional information field\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1965 | if (gsn->cb_conf) |
| 1966 | gsn->cb_conf(type, EOF, pdp, cbp); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1967 | return EOF; |
| 1968 | } |
| 1969 | |
| 1970 | if (version == 1) { |
| 1971 | if (gtpie_gettlv |
| 1972 | (ie, GTPIE_QOS_PROFILE, 0, &pdp->qos_neg.l, |
| 1973 | &pdp->qos_neg.v, sizeof(pdp->qos_neg.v))) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 1974 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_MISSING); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 1975 | GTP_LOGPKG(LOGL_ERROR, peer, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1976 | pack, len, |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 1977 | "Missing conditional information field\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1978 | if (gsn->cb_conf) |
| 1979 | gsn->cb_conf(type, EOF, pdp, cbp); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1980 | return EOF; |
| 1981 | } |
| 1982 | } |
| 1983 | |
| 1984 | } |
| 1985 | |
| 1986 | if (gsn->cb_conf) |
| 1987 | gsn->cb_conf(type, cause, pdp, cbp); |
| 1988 | |
| 1989 | return 0; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 1990 | } |
| 1991 | |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 1992 | /* API: Send Update PDP Context Request */ |
| 1993 | int gtp_update_context(struct gsn_t *gsn, struct pdp_t *pdp, void *cbp, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 1994 | struct in_addr *inetaddr) |
| 1995 | { |
| 1996 | union gtp_packet packet; |
| 1997 | unsigned int length = |
| 1998 | get_default_gtp(pdp->version, GTP_UPDATE_PDP_REQ, &packet); |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 1999 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2000 | if (pdp->version == 0) |
| 2001 | gtpie_tv0(&packet, &length, GTP_MAX, GTPIE_QOS_PROFILE0, |
| 2002 | sizeof(pdp->qos_req0), pdp->qos_req0); |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 2003 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2004 | /* Include IMSI if updating with unknown teic_gn */ |
| 2005 | if ((pdp->version == 1) && (!pdp->teic_gn)) |
| 2006 | gtpie_tv0(&packet, &length, GTP_MAX, GTPIE_IMSI, |
| 2007 | sizeof(pdp->imsi), (uint8_t *) & pdp->imsi); |
| 2008 | |
| 2009 | gtpie_tv1(&packet, &length, GTP_MAX, GTPIE_RECOVERY, |
| 2010 | gsn->restart_counter); |
| 2011 | |
| 2012 | if (pdp->version == 0) { |
| 2013 | gtpie_tv2(&packet, &length, GTP_MAX, GTPIE_FL_DI, pdp->fllu); |
| 2014 | gtpie_tv2(&packet, &length, GTP_MAX, GTPIE_FL_C, pdp->fllc); |
| 2015 | } |
| 2016 | |
| 2017 | if (pdp->version == 1) { |
| 2018 | gtpie_tv4(&packet, &length, GTP_MAX, GTPIE_TEI_DI, |
| 2019 | pdp->teid_own); |
| 2020 | |
| 2021 | if (!pdp->teic_confirmed) |
| 2022 | gtpie_tv4(&packet, &length, GTP_MAX, GTPIE_TEI_C, |
| 2023 | pdp->teic_own); |
| 2024 | } |
| 2025 | |
| 2026 | gtpie_tv1(&packet, &length, GTP_MAX, GTPIE_NSAPI, pdp->nsapi); |
| 2027 | |
Pau Espin Pedrol | 732131d | 2018-01-25 17:23:09 +0100 | [diff] [blame] | 2028 | /* TODO |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2029 | gtpie_tv2(&packet, &length, GTP_MAX, GTPIE_TRACE_REF, |
| 2030 | pdp->traceref); |
| 2031 | gtpie_tv2(&packet, &length, GTP_MAX, GTPIE_TRACE_TYPE, |
| 2032 | pdp->tracetype); */ |
| 2033 | |
| 2034 | /* TODO if ggsn update message |
Pau Espin Pedrol | 732131d | 2018-01-25 17:23:09 +0100 | [diff] [blame] | 2035 | gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_EUA, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2036 | pdp->eua.l, pdp->eua.v); |
| 2037 | */ |
| 2038 | |
| 2039 | gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_GSN_ADDR, |
| 2040 | pdp->gsnlc.l, pdp->gsnlc.v); |
| 2041 | gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_GSN_ADDR, |
| 2042 | pdp->gsnlu.l, pdp->gsnlu.v); |
| 2043 | |
| 2044 | if (pdp->version == 1) |
| 2045 | gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_QOS_PROFILE, |
| 2046 | pdp->qos_req.l, pdp->qos_req.v); |
| 2047 | |
| 2048 | if ((pdp->version == 1) && pdp->tft.l) |
| 2049 | gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_TFT, |
| 2050 | pdp->tft.l, pdp->tft.v); |
| 2051 | |
| 2052 | if ((pdp->version == 1) && pdp->triggerid.l) |
| 2053 | gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_TRIGGER_ID, |
| 2054 | pdp->triggerid.l, pdp->triggerid.v); |
| 2055 | |
| 2056 | if ((pdp->version == 1) && pdp->omcid.l) |
| 2057 | gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_OMC_ID, |
| 2058 | pdp->omcid.l, pdp->omcid.v); |
| 2059 | |
Daniel Willmann | 134a775 | 2016-02-03 18:53:29 +0100 | [diff] [blame] | 2060 | gtp_req(gsn, pdp->version, pdp, &packet, length, inetaddr, cbp); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2061 | |
| 2062 | return 0; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 2063 | } |
| 2064 | |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 2065 | /* Send Update PDP Context Response */ |
Pau Espin Pedrol | 07730bb | 2018-01-25 18:43:38 +0100 | [diff] [blame] | 2066 | static int gtp_update_pdp_resp(struct gsn_t *gsn, uint8_t version, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2067 | struct sockaddr_in *peer, int fd, |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 2068 | void *pack, unsigned len, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2069 | struct pdp_t *pdp, uint8_t cause) |
| 2070 | { |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 2071 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2072 | union gtp_packet packet; |
| 2073 | unsigned int length = |
| 2074 | get_default_gtp(version, GTP_UPDATE_PDP_RSP, &packet); |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 2075 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2076 | gtpie_tv1(&packet, &length, GTP_MAX, GTPIE_CAUSE, cause); |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 2077 | |
Daniel Willmann | 6a2e825 | 2023-11-23 18:41:59 +0100 | [diff] [blame] | 2078 | if (gtp_cause_successful(cause)) { |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2079 | |
| 2080 | if (version == 0) |
| 2081 | gtpie_tv0(&packet, &length, GTP_MAX, GTPIE_QOS_PROFILE0, |
| 2082 | sizeof(pdp->qos_neg0), pdp->qos_neg0); |
| 2083 | |
| 2084 | gtpie_tv1(&packet, &length, GTP_MAX, GTPIE_RECOVERY, |
| 2085 | gsn->restart_counter); |
| 2086 | |
| 2087 | if (version == 0) { |
| 2088 | gtpie_tv2(&packet, &length, GTP_MAX, GTPIE_FL_DI, |
| 2089 | pdp->fllu); |
| 2090 | gtpie_tv2(&packet, &length, GTP_MAX, GTPIE_FL_C, |
| 2091 | pdp->fllc); |
| 2092 | } |
| 2093 | |
| 2094 | if (version == 1) { |
| 2095 | gtpie_tv4(&packet, &length, GTP_MAX, GTPIE_TEI_DI, |
| 2096 | pdp->teid_own); |
| 2097 | |
| 2098 | if (!pdp->teic_confirmed) |
| 2099 | gtpie_tv4(&packet, &length, GTP_MAX, |
| 2100 | GTPIE_TEI_C, pdp->teic_own); |
| 2101 | } |
| 2102 | |
| 2103 | /* TODO we use teid_own as charging ID address */ |
| 2104 | gtpie_tv4(&packet, &length, GTP_MAX, GTPIE_CHARGING_ID, |
| 2105 | pdp->teid_own); |
| 2106 | |
Pau Espin Pedrol | 732131d | 2018-01-25 17:23:09 +0100 | [diff] [blame] | 2107 | /* If ggsn |
| 2108 | gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_EUA, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2109 | pdp->eua.l, pdp->eua.v); */ |
| 2110 | |
| 2111 | gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_GSN_ADDR, |
| 2112 | pdp->gsnlc.l, pdp->gsnlc.v); |
| 2113 | gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_GSN_ADDR, |
| 2114 | pdp->gsnlu.l, pdp->gsnlu.v); |
| 2115 | |
| 2116 | if (version == 1) |
| 2117 | gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_QOS_PROFILE, |
| 2118 | pdp->qos_neg.l, pdp->qos_neg.v); |
| 2119 | |
| 2120 | /* TODO: Charging gateway address */ |
| 2121 | } |
| 2122 | |
| 2123 | return gtp_resp(version, gsn, pdp, &packet, length, peer, |
| 2124 | fd, get_seq(pack), get_tid(pack)); |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 2125 | } |
| 2126 | |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 2127 | /* Handle Update PDP Context Request */ |
Pau Espin Pedrol | 07730bb | 2018-01-25 18:43:38 +0100 | [diff] [blame] | 2128 | static int gtp_update_pdp_ind(struct gsn_t *gsn, uint8_t version, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2129 | struct sockaddr_in *peer, int fd, |
| 2130 | void *pack, unsigned len) |
| 2131 | { |
| 2132 | struct pdp_t *pdp; |
| 2133 | struct pdp_t pdp_backup; |
| 2134 | union gtpie_member *ie[GTPIE_SIZE]; |
| 2135 | uint8_t recovery; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 2136 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2137 | uint16_t seq = get_seq(pack); |
| 2138 | int hlen = get_hlen(pack); |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 2139 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2140 | uint64_t imsi; |
| 2141 | uint8_t nsapi; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 2142 | |
Pau Espin Pedrol | de72d26 | 2019-05-29 18:17:05 +0200 | [diff] [blame] | 2143 | /* Is this a duplicate ? */ |
| 2144 | if (!gtp_duplicate(gsn, version, peer, seq)) { |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2145 | return 0; /* We allready send of response once */ |
| 2146 | } |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 2147 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2148 | /* Decode information elements */ |
| 2149 | if (gtpie_decaps(ie, version, pack + hlen, len - hlen)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 2150 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_INVALID); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 2151 | GTP_LOGPKG(LOGL_ERROR, peer, pack, len, |
| 2152 | "Invalid message format\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2153 | if (0 == version) |
| 2154 | return EOF; |
| 2155 | else |
| 2156 | return gtp_update_pdp_resp(gsn, version, peer, fd, pack, |
| 2157 | len, NULL, |
| 2158 | GTPCAUSE_INVALID_MESSAGE); |
| 2159 | } |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 2160 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2161 | /* Finding PDP: */ |
| 2162 | /* For GTP0 we use the tunnel identifier to provide imsi and nsapi. */ |
| 2163 | /* For GTP1 we must use imsi and nsapi if imsi is present. Otherwise */ |
| 2164 | /* we have to use the tunnel endpoint identifier */ |
| 2165 | if (version == 0) { |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2166 | /* Find the context in question */ |
Vadim Yanitskiy | 00a6171 | 2019-08-30 21:00:22 +0200 | [diff] [blame] | 2167 | if (gtp_pdp_tidget(gsn, &pdp, get_tid(pack))) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 2168 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_ERR_UNKNOWN_PDP); |
Pau Espin Pedrol | bfd3119 | 2021-04-22 15:01:23 +0200 | [diff] [blame] | 2169 | GTP_LOGPKG(LOGL_ERROR, peer, pack, len, |
| 2170 | "Unknown PDP context: TID=0x%" PRIx64 "\n", |
| 2171 | get_tid(pack)); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2172 | return gtp_update_pdp_resp(gsn, version, peer, fd, pack, |
| 2173 | len, NULL, |
| 2174 | GTPCAUSE_NON_EXIST); |
| 2175 | } |
Vadim Yanitskiy | 00a6171 | 2019-08-30 21:00:22 +0200 | [diff] [blame] | 2176 | |
| 2177 | /* Update IMSI and NSAPI */ |
| 2178 | pdp_set_imsi_nsapi(pdp, get_tid(pack)); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2179 | } else if (version == 1) { |
| 2180 | /* NSAPI (mandatory) */ |
| 2181 | if (gtpie_gettv1(ie, GTPIE_NSAPI, 0, &nsapi)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 2182 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_MISSING); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 2183 | GTP_LOGPKG(LOGL_ERROR, peer, pack, |
| 2184 | len, "Missing mandatory information field\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2185 | return gtp_update_pdp_resp(gsn, version, peer, fd, pack, |
| 2186 | len, NULL, |
| 2187 | GTPCAUSE_MAN_IE_MISSING); |
| 2188 | } |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 2189 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2190 | /* IMSI (conditional) */ |
| 2191 | if (gtpie_gettv0(ie, GTPIE_IMSI, 0, &imsi, sizeof(imsi))) { |
| 2192 | /* Find the context in question */ |
Pau Espin Pedrol | 9fbcb10 | 2019-05-31 16:29:32 +0200 | [diff] [blame] | 2193 | if (gtp_pdp_getgtp1(gsn, &pdp, get_tei(pack))) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 2194 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_ERR_UNKNOWN_PDP); |
Pau Espin Pedrol | bfd3119 | 2021-04-22 15:01:23 +0200 | [diff] [blame] | 2195 | GTP_LOGPKG(LOGL_ERROR, peer, pack, len, |
| 2196 | "Unknown PDP context: TEI=0x%" PRIx32 "\n", |
| 2197 | get_tei(pack)); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2198 | return gtp_update_pdp_resp(gsn, version, peer, |
| 2199 | fd, pack, len, NULL, |
| 2200 | GTPCAUSE_NON_EXIST); |
| 2201 | } |
| 2202 | } else { |
| 2203 | /* Find the context in question */ |
Pau Espin Pedrol | 9fbcb10 | 2019-05-31 16:29:32 +0200 | [diff] [blame] | 2204 | if (gtp_pdp_getimsi(gsn, &pdp, imsi, nsapi)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 2205 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_ERR_UNKNOWN_PDP); |
Pau Espin Pedrol | bfd3119 | 2021-04-22 15:01:23 +0200 | [diff] [blame] | 2206 | GTP_LOGPKG(LOGL_ERROR, peer, pack, len, |
| 2207 | "Unknown PDP context: IMSI=0x%" PRIx64 |
| 2208 | " NSAPI=%" PRIu8 "\n", imsi, nsapi); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2209 | return gtp_update_pdp_resp(gsn, version, peer, |
| 2210 | fd, pack, len, NULL, |
| 2211 | GTPCAUSE_NON_EXIST); |
| 2212 | } |
| 2213 | } |
| 2214 | } else { |
Holger Hans Peter Freyther | 01b40d0 | 2014-12-04 15:01:53 +0100 | [diff] [blame] | 2215 | LOGP(DLGTP, LOGL_ERROR, "Unknown version: %d\n", version); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2216 | return EOF; |
| 2217 | } |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 2218 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2219 | /* Make a backup copy in case anything is wrong */ |
| 2220 | memcpy(&pdp_backup, pdp, sizeof(pdp_backup)); |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 2221 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2222 | if (version == 0) { |
| 2223 | if (gtpie_gettv0(ie, GTPIE_QOS_PROFILE0, 0, |
| 2224 | pdp->qos_req0, sizeof(pdp->qos_req0))) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 2225 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_MISSING); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 2226 | GTP_LOGPKG(LOGL_ERROR, peer, pack, |
| 2227 | len, "Missing mandatory information field\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2228 | memcpy(pdp, &pdp_backup, sizeof(pdp_backup)); |
| 2229 | return gtp_update_pdp_resp(gsn, version, peer, fd, pack, |
| 2230 | len, pdp, |
| 2231 | GTPCAUSE_MAN_IE_MISSING); |
| 2232 | } |
| 2233 | } |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 2234 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2235 | /* Recovery (optional) */ |
| 2236 | if (!gtpie_gettv1(ie, GTPIE_RECOVERY, 0, &recovery)) { |
Pau Espin Pedrol | b5f9334 | 2018-07-23 11:24:07 +0200 | [diff] [blame] | 2237 | emit_cb_recovery(gsn, peer, pdp, recovery); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2238 | } |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 2239 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2240 | if (version == 0) { |
| 2241 | if (gtpie_gettv2(ie, GTPIE_FL_DI, 0, &pdp->flru)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 2242 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_MISSING); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 2243 | GTP_LOGPKG(LOGL_ERROR, peer, pack, |
| 2244 | len, "Missing mandatory information field\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2245 | memcpy(pdp, &pdp_backup, sizeof(pdp_backup)); |
| 2246 | return gtp_update_pdp_resp(gsn, version, peer, fd, pack, |
| 2247 | len, pdp, |
| 2248 | GTPCAUSE_MAN_IE_MISSING); |
| 2249 | } |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 2250 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2251 | if (gtpie_gettv2(ie, GTPIE_FL_C, 0, &pdp->flrc)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 2252 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_MISSING); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 2253 | GTP_LOGPKG(LOGL_ERROR, peer, pack, |
| 2254 | len, "Missing mandatory information field\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2255 | memcpy(pdp, &pdp_backup, sizeof(pdp_backup)); |
| 2256 | return gtp_update_pdp_resp(gsn, version, peer, fd, pack, |
| 2257 | len, pdp, |
| 2258 | GTPCAUSE_MAN_IE_MISSING); |
| 2259 | } |
| 2260 | } |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 2261 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2262 | if (version == 1) { |
| 2263 | /* TEID (mandatory) */ |
| 2264 | if (gtpie_gettv4(ie, GTPIE_TEI_DI, 0, &pdp->teid_gn)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 2265 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_MISSING); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 2266 | GTP_LOGPKG(LOGL_ERROR, peer, pack, |
| 2267 | len, "Missing mandatory information field\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2268 | memcpy(pdp, &pdp_backup, sizeof(pdp_backup)); |
| 2269 | return gtp_update_pdp_resp(gsn, version, peer, fd, pack, |
| 2270 | len, pdp, |
| 2271 | GTPCAUSE_MAN_IE_MISSING); |
| 2272 | } |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 2273 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2274 | /* TEIC (conditional) */ |
| 2275 | /* If TEIC is not included it means that we have allready received it */ |
| 2276 | /* TODO: From 29.060 it is not clear if TEI_C MUST be included for */ |
| 2277 | /* all updated contexts, or only for one of the linked contexts */ |
| 2278 | gtpie_gettv4(ie, GTPIE_TEI_C, 0, &pdp->teic_gn); |
| 2279 | |
| 2280 | /* NSAPI (mandatory) */ |
| 2281 | if (gtpie_gettv1(ie, GTPIE_NSAPI, 0, &pdp->nsapi)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 2282 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_MISSING); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 2283 | GTP_LOGPKG(LOGL_ERROR, peer, pack, |
| 2284 | len, "Missing mandatory information field\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2285 | memcpy(pdp, &pdp_backup, sizeof(pdp_backup)); |
| 2286 | return gtp_update_pdp_resp(gsn, version, peer, fd, pack, |
| 2287 | len, pdp, |
| 2288 | GTPCAUSE_MAN_IE_MISSING); |
| 2289 | } |
| 2290 | } |
| 2291 | |
| 2292 | /* Trace reference (optional) */ |
| 2293 | /* Trace type (optional) */ |
| 2294 | |
| 2295 | /* End User Address (conditional) TODO: GGSN Initiated |
| 2296 | if (gtpie_gettlv(ie, GTPIE_EUA, 0, &pdp->eua.l, |
| 2297 | &pdp->eua.v, sizeof(pdp->eua.v))) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 2298 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_MISSING); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 2299 | GTP_LOGPKG(LOGL_ERROR, peer, pack, len, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2300 | "Missing mandatory information field"); |
| 2301 | memcpy(pdp, &pdp_backup, sizeof(pdp_backup)); |
Pau Espin Pedrol | 732131d | 2018-01-25 17:23:09 +0100 | [diff] [blame] | 2302 | return gtp_update_pdp_resp(gsn, version, pdp, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2303 | GTPCAUSE_MAN_IE_MISSING); |
| 2304 | } */ |
| 2305 | |
| 2306 | /* SGSN address for signalling (mandatory) */ |
| 2307 | /* It is weird that this is mandatory when TEIC is conditional */ |
| 2308 | if (gtpie_gettlv(ie, GTPIE_GSN_ADDR, 0, &pdp->gsnrc.l, |
| 2309 | &pdp->gsnrc.v, sizeof(pdp->gsnrc.v))) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 2310 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_MISSING); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 2311 | GTP_LOGPKG(LOGL_ERROR, peer, pack, len, |
| 2312 | "Missing mandatory information field\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2313 | memcpy(pdp, &pdp_backup, sizeof(pdp_backup)); |
| 2314 | return gtp_update_pdp_resp(gsn, version, peer, fd, pack, len, |
| 2315 | pdp, GTPCAUSE_MAN_IE_MISSING); |
| 2316 | } |
| 2317 | |
| 2318 | /* SGSN address for user traffic (mandatory) */ |
| 2319 | if (gtpie_gettlv(ie, GTPIE_GSN_ADDR, 1, &pdp->gsnru.l, |
| 2320 | &pdp->gsnru.v, sizeof(pdp->gsnru.v))) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 2321 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_MISSING); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 2322 | GTP_LOGPKG(LOGL_ERROR, peer, pack, len, |
| 2323 | "Missing mandatory information field\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2324 | memcpy(pdp, &pdp_backup, sizeof(pdp_backup)); |
| 2325 | return gtp_update_pdp_resp(gsn, version, peer, fd, pack, len, |
| 2326 | pdp, GTPCAUSE_MAN_IE_MISSING); |
| 2327 | } |
| 2328 | |
| 2329 | if (version == 1) { |
| 2330 | /* QoS (mandatory) */ |
| 2331 | if (gtpie_gettlv(ie, GTPIE_QOS_PROFILE, 0, &pdp->qos_req.l, |
| 2332 | &pdp->qos_req.v, sizeof(pdp->qos_req.v))) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 2333 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_MISSING); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 2334 | GTP_LOGPKG(LOGL_ERROR, peer, pack, |
| 2335 | len, "Missing mandatory information field\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2336 | memcpy(pdp, &pdp_backup, sizeof(pdp_backup)); |
| 2337 | return gtp_update_pdp_resp(gsn, version, peer, fd, pack, |
| 2338 | len, pdp, |
| 2339 | GTPCAUSE_MAN_IE_MISSING); |
| 2340 | } |
| 2341 | |
| 2342 | /* TFT (conditional) */ |
| 2343 | if (gtpie_gettlv(ie, GTPIE_TFT, 0, &pdp->tft.l, |
| 2344 | &pdp->tft.v, sizeof(pdp->tft.v))) { |
| 2345 | } |
| 2346 | |
| 2347 | /* OMC identity */ |
| 2348 | } |
| 2349 | |
| 2350 | /* Confirm to peer that things were "successful" */ |
| 2351 | return gtp_update_pdp_resp(gsn, version, peer, fd, pack, len, pdp, |
| 2352 | GTPCAUSE_ACC_REQ); |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 2353 | } |
| 2354 | |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 2355 | /* Handle Update PDP Context Response */ |
Pau Espin Pedrol | 07730bb | 2018-01-25 18:43:38 +0100 | [diff] [blame] | 2356 | static int gtp_update_pdp_conf(struct gsn_t *gsn, uint8_t version, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2357 | struct sockaddr_in *peer, void *pack, unsigned len) |
| 2358 | { |
Pau Espin Pedrol | 00e0559 | 2021-04-22 13:47:57 +0200 | [diff] [blame] | 2359 | struct pdp_t *pdp = NULL; |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2360 | union gtpie_member *ie[GTPIE_SIZE]; |
Pau Espin Pedrol | 00e0559 | 2021-04-22 13:47:57 +0200 | [diff] [blame] | 2361 | uint8_t cause = EOF; |
| 2362 | uint8_t recovery; |
| 2363 | int rc = 0; |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2364 | void *cbp = NULL; |
| 2365 | uint8_t type = 0; |
Pau Espin Pedrol | 00e0559 | 2021-04-22 13:47:57 +0200 | [diff] [blame] | 2366 | bool trigger_recovery = false; |
Daniel Willmann | 05f3ef3 | 2016-02-03 18:53:30 +0100 | [diff] [blame] | 2367 | int hlen = get_hlen(pack); |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 2368 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2369 | /* Remove packet from queue */ |
| 2370 | if (gtp_conf(gsn, 0, peer, pack, len, &type, &cbp)) |
| 2371 | return EOF; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 2372 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2373 | /* Decode information elements */ |
Daniel Willmann | 05f3ef3 | 2016-02-03 18:53:30 +0100 | [diff] [blame] | 2374 | if (gtpie_decaps(ie, version, pack + hlen, len - hlen)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 2375 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_INVALID); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 2376 | GTP_LOGPKG(LOGL_ERROR, peer, pack, len, |
| 2377 | "Invalid message format\n"); |
Daniel Willmann | d997552 | 2016-02-04 15:38:12 +0100 | [diff] [blame] | 2378 | goto err_out; |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2379 | } |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 2380 | |
Pau Espin Pedrol | 00e0559 | 2021-04-22 13:47:57 +0200 | [diff] [blame] | 2381 | /* Extract recovery (optional) */ |
| 2382 | if (!gtpie_gettv1(ie, GTPIE_RECOVERY, 0, &recovery)) |
| 2383 | trigger_recovery = true; |
| 2384 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2385 | /* Extract cause value (mandatory) */ |
| 2386 | if (gtpie_gettv1(ie, GTPIE_CAUSE, 0, &cause)) { |
Daniel Willmann | d997552 | 2016-02-04 15:38:12 +0100 | [diff] [blame] | 2387 | goto err_missing; |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2388 | } |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 2389 | |
Pau Espin Pedrol | 00e0559 | 2021-04-22 13:47:57 +0200 | [diff] [blame] | 2390 | /* 3GPP TS 29.060 sec 8.2: "Receiving node shall send back to the source |
| 2391 | * of the message, a response with the appropriate cause value (either |
| 2392 | * "Non-existent" or "Context not found"). The Tunnel Endpoint |
| 2393 | * Identifier used in the response message shall be set to all zeroes." |
| 2394 | * Hence, TEID=0 in this scenario, it makes no sense to infer PDP ctx |
| 2395 | * from it. User is responsible to infer it from cbp */ |
| 2396 | if (cause != GTPCAUSE_NON_EXIST && cause != GTPCAUSE_CONTEXT_NOT_FOUND) { |
| 2397 | /* Find the context in question */ |
| 2398 | if (gtp_pdp_getgtp1(gsn, &pdp, get_tei(pack))) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 2399 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_ERR_UNKNOWN_PDP); |
Pau Espin Pedrol | 00e0559 | 2021-04-22 13:47:57 +0200 | [diff] [blame] | 2400 | GTP_LOGPKG(LOGL_ERROR, peer, pack, len, |
Pau Espin Pedrol | bfd3119 | 2021-04-22 15:01:23 +0200 | [diff] [blame] | 2401 | "Unknown PDP context: TEI=0x%" PRIx32 "\n", get_tei(pack)); |
Pau Espin Pedrol | 00e0559 | 2021-04-22 13:47:57 +0200 | [diff] [blame] | 2402 | goto err_out; |
| 2403 | } |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2404 | } |
| 2405 | |
| 2406 | /* Check all conditional information elements */ |
Daniel Willmann | d997552 | 2016-02-04 15:38:12 +0100 | [diff] [blame] | 2407 | /* TODO: This does not handle GGSN-initiated update responses */ |
Daniel Willmann | 6a2e825 | 2023-11-23 18:41:59 +0100 | [diff] [blame] | 2408 | if (gtp_cause_successful(cause)) { |
Daniel Willmann | d997552 | 2016-02-04 15:38:12 +0100 | [diff] [blame] | 2409 | if (version == 0) { |
| 2410 | if (gtpie_gettv0(ie, GTPIE_QOS_PROFILE0, 0, |
| 2411 | &pdp->qos_neg0, |
| 2412 | sizeof(pdp->qos_neg0))) { |
| 2413 | goto err_missing; |
| 2414 | } |
| 2415 | |
| 2416 | if (gtpie_gettv2(ie, GTPIE_FL_DI, 0, &pdp->flru)) { |
| 2417 | goto err_missing; |
| 2418 | } |
| 2419 | |
| 2420 | if (gtpie_gettv2(ie, GTPIE_FL_C, 0, &pdp->flrc)) { |
| 2421 | goto err_missing; |
| 2422 | } |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2423 | } |
| 2424 | |
Daniel Willmann | d997552 | 2016-02-04 15:38:12 +0100 | [diff] [blame] | 2425 | if (version == 1) { |
| 2426 | if (gtpie_gettv4(ie, GTPIE_TEI_DI, 0, &pdp->teid_gn)) { |
| 2427 | goto err_missing; |
| 2428 | } |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2429 | |
Daniel Willmann | d997552 | 2016-02-04 15:38:12 +0100 | [diff] [blame] | 2430 | if (gtpie_gettv4(ie, GTPIE_TEI_C, 0, &pdp->teic_gn)) { |
| 2431 | goto err_missing; |
| 2432 | } |
Pau Espin Pedrol | 0b1d9db | 2021-04-21 19:45:23 +0200 | [diff] [blame] | 2433 | /* Register that we have received a valid teic from GGSN */ |
| 2434 | pdp->teic_confirmed = 1; |
Daniel Willmann | d997552 | 2016-02-04 15:38:12 +0100 | [diff] [blame] | 2435 | } |
| 2436 | |
| 2437 | if (gtpie_gettv4(ie, GTPIE_CHARGING_ID, 0, &pdp->cid)) { |
| 2438 | goto err_missing; |
| 2439 | } |
| 2440 | |
| 2441 | if (gtpie_gettlv(ie, GTPIE_GSN_ADDR, 0, &pdp->gsnrc.l, |
| 2442 | &pdp->gsnrc.v, sizeof(pdp->gsnrc.v))) { |
| 2443 | goto err_missing; |
| 2444 | } |
| 2445 | |
| 2446 | if (gtpie_gettlv(ie, GTPIE_GSN_ADDR, 1, &pdp->gsnru.l, |
| 2447 | &pdp->gsnru.v, sizeof(pdp->gsnru.v))) { |
| 2448 | goto err_missing; |
| 2449 | } |
| 2450 | |
| 2451 | if (version == 1) { |
| 2452 | if (gtpie_gettlv |
| 2453 | (ie, GTPIE_QOS_PROFILE, 0, &pdp->qos_neg.l, |
| 2454 | &pdp->qos_neg.v, sizeof(pdp->qos_neg.v))) { |
| 2455 | goto err_missing; |
| 2456 | } |
| 2457 | } |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2458 | } |
Daniel Willmann | d997552 | 2016-02-04 15:38:12 +0100 | [diff] [blame] | 2459 | |
Pau Espin Pedrol | 00e0559 | 2021-04-22 13:47:57 +0200 | [diff] [blame] | 2460 | generic_ret: |
| 2461 | if (trigger_recovery) |
| 2462 | emit_cb_recovery(gsn, peer, pdp, recovery); |
Daniel Willmann | d997552 | 2016-02-04 15:38:12 +0100 | [diff] [blame] | 2463 | if (gsn->cb_conf) |
| 2464 | gsn->cb_conf(type, cause, pdp, cbp); |
Pau Espin Pedrol | 00e0559 | 2021-04-22 13:47:57 +0200 | [diff] [blame] | 2465 | return rc; /* Succes */ |
Daniel Willmann | d997552 | 2016-02-04 15:38:12 +0100 | [diff] [blame] | 2466 | |
| 2467 | err_missing: |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 2468 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_MISSING); |
Daniel Willmann | d997552 | 2016-02-04 15:38:12 +0100 | [diff] [blame] | 2469 | GTP_LOGPKG(LOGL_ERROR, peer, pack, len, |
| 2470 | "Missing information field\n"); |
| 2471 | err_out: |
Pau Espin Pedrol | 00e0559 | 2021-04-22 13:47:57 +0200 | [diff] [blame] | 2472 | rc = EOF; |
| 2473 | goto generic_ret; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 2474 | } |
| 2475 | |
Pau Espin Pedrol | 8e8c7ef | 2018-07-16 16:47:12 +0200 | [diff] [blame] | 2476 | /* API: Deprecated. Send Delete PDP Context Request And free pdp ctx. */ |
jjako | 2c38133 | 2003-10-21 19:09:53 +0000 | [diff] [blame] | 2477 | int gtp_delete_context_req(struct gsn_t *gsn, struct pdp_t *pdp, void *cbp, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2478 | int teardown) |
| 2479 | { |
Pau Espin Pedrol | 8e8c7ef | 2018-07-16 16:47:12 +0200 | [diff] [blame] | 2480 | struct pdp_t *linked_pdp; |
Pau Espin Pedrol | 8e8c7ef | 2018-07-16 16:47:12 +0200 | [diff] [blame] | 2481 | |
Pau Espin Pedrol | 9fbcb10 | 2019-05-31 16:29:32 +0200 | [diff] [blame] | 2482 | if (gtp_pdp_getgtp1(gsn, &linked_pdp, pdp->teic_own)) { |
Pau Espin Pedrol | 8e8c7ef | 2018-07-16 16:47:12 +0200 | [diff] [blame] | 2483 | LOGP(DLGTP, LOGL_ERROR, |
| 2484 | "Unknown linked PDP context: %u\n", pdp->teic_own); |
| 2485 | return EOF; |
| 2486 | } |
| 2487 | |
| 2488 | if (gtp_delete_context_req2(gsn, pdp, cbp, teardown) == EOF) |
| 2489 | return EOF; |
| 2490 | |
| 2491 | if (teardown) { /* Remove all contexts */ |
Pau Espin Pedrol | 0d0b059 | 2019-05-29 20:42:09 +0200 | [diff] [blame] | 2492 | gtp_freepdp_teardown(gsn, linked_pdp); |
Pau Espin Pedrol | 8e8c7ef | 2018-07-16 16:47:12 +0200 | [diff] [blame] | 2493 | } else { |
Pau Espin Pedrol | 8651573 | 2019-05-31 16:40:37 +0200 | [diff] [blame] | 2494 | /* If we end up here (no teardown) it means we still |
| 2495 | have at least another pdp context active for this |
| 2496 | PDN connection (since last DeleteReq should come |
| 2497 | with teardown enabled). If the ctx to delete is a |
| 2498 | secondary ctx, simply free it. If it's the primary |
| 2499 | ctx, mark it as nodata but don't free it since we |
| 2500 | need it to hold data linked together and we'll |
| 2501 | require it later to tear down the entire tree. Still, |
| 2502 | we announce its deletion through cb_delete_context |
| 2503 | because we don't want user to release its related |
| 2504 | data and not use it anymore. |
| 2505 | */ |
Pau Espin Pedrol | 8e8c7ef | 2018-07-16 16:47:12 +0200 | [diff] [blame] | 2506 | if (pdp == linked_pdp) { |
Pau Espin Pedrol | 93dd798 | 2019-05-31 16:42:05 +0200 | [diff] [blame] | 2507 | if (gsn->cb_delete_context) |
| 2508 | gsn->cb_delete_context(pdp); |
| 2509 | pdp->secondary_tei[pdp->nsapi & 0xf0] = 0; |
| 2510 | pdp->nodata = 1; |
| 2511 | } else { |
| 2512 | gtp_freepdp(gsn, pdp); |
| 2513 | } |
Pau Espin Pedrol | 8e8c7ef | 2018-07-16 16:47:12 +0200 | [diff] [blame] | 2514 | } |
| 2515 | |
| 2516 | return 0; |
| 2517 | } |
| 2518 | |
Oliver Smith | 1cde2c1 | 2019-05-13 11:35:03 +0200 | [diff] [blame] | 2519 | /* API: Send Delete PDP Context Request. PDP CTX shall be free'd by user at any |
Pau Espin Pedrol | 4e605b3 | 2019-08-29 13:54:28 +0200 | [diff] [blame] | 2520 | point in time later than this function through a call to pdp_freepdp(pdp) (or |
| 2521 | through gtp_freepdp() if willing to receive cb_delete_context() callback), |
| 2522 | but it must be freed no later than during cb_conf(GTP_DELETE_PDP_REQ, pdp) */ |
Pau Espin Pedrol | 8e8c7ef | 2018-07-16 16:47:12 +0200 | [diff] [blame] | 2523 | int gtp_delete_context_req2(struct gsn_t *gsn, struct pdp_t *pdp, void *cbp, |
| 2524 | int teardown) |
| 2525 | { |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2526 | union gtp_packet packet; |
| 2527 | unsigned int length = |
| 2528 | get_default_gtp(pdp->version, GTP_DELETE_PDP_REQ, &packet); |
| 2529 | struct in_addr addr; |
| 2530 | struct pdp_t *linked_pdp; |
Pau Espin Pedrol | 9ee8d32 | 2019-05-30 14:11:22 +0200 | [diff] [blame] | 2531 | int count; |
jjako | 2c38133 | 2003-10-21 19:09:53 +0000 | [diff] [blame] | 2532 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2533 | if (gsna2in_addr(&addr, &pdp->gsnrc)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 2534 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_ERR_ADDRESS); |
Max | 14b1b63 | 2017-08-21 20:14:59 +0200 | [diff] [blame] | 2535 | LOGP(DLGTP, LOGL_ERROR, "GSN address (len=%u) conversion failed\n", pdp->gsnrc.l); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2536 | return EOF; |
jjako | 2c38133 | 2003-10-21 19:09:53 +0000 | [diff] [blame] | 2537 | } |
jjako | 2c38133 | 2003-10-21 19:09:53 +0000 | [diff] [blame] | 2538 | |
Pau Espin Pedrol | 9fbcb10 | 2019-05-31 16:29:32 +0200 | [diff] [blame] | 2539 | if (gtp_pdp_getgtp1(gsn, &linked_pdp, pdp->teic_own)) { |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 2540 | LOGP(DLGTP, LOGL_ERROR, |
Holger Hans Peter Freyther | 01b40d0 | 2014-12-04 15:01:53 +0100 | [diff] [blame] | 2541 | "Unknown linked PDP context: %u\n", pdp->teic_own); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2542 | return EOF; |
| 2543 | } |
| 2544 | |
| 2545 | if (!teardown) { |
Pau Espin Pedrol | 9ee8d32 | 2019-05-30 14:11:22 +0200 | [diff] [blame] | 2546 | count = pdp_count_secondary(linked_pdp); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2547 | if (count <= 1) { |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 2548 | LOGP(DLGTP, LOGL_ERROR, |
Holger Hans Peter Freyther | 01b40d0 | 2014-12-04 15:01:53 +0100 | [diff] [blame] | 2549 | "Must use teardown for last context: %d\n", count); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2550 | return EOF; |
| 2551 | } |
| 2552 | } |
| 2553 | |
| 2554 | if (pdp->version == 1) { |
| 2555 | if (teardown) |
| 2556 | gtpie_tv1(&packet, &length, GTP_MAX, GTPIE_TEARDOWN, |
| 2557 | 0xff); |
| 2558 | |
| 2559 | gtpie_tv1(&packet, &length, GTP_MAX, GTPIE_NSAPI, pdp->nsapi); |
| 2560 | } |
| 2561 | |
| 2562 | gtp_req(gsn, pdp->version, pdp, &packet, length, &addr, cbp); |
| 2563 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2564 | return 0; |
jjako | 2c38133 | 2003-10-21 19:09:53 +0000 | [diff] [blame] | 2565 | } |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 2566 | |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 2567 | /* Send Delete PDP Context Response */ |
| 2568 | int gtp_delete_pdp_resp(struct gsn_t *gsn, int version, |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 2569 | struct sockaddr_in *peer, int fd, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2570 | void *pack, unsigned len, |
| 2571 | struct pdp_t *pdp, struct pdp_t *linked_pdp, |
jjako | 2c38133 | 2003-10-21 19:09:53 +0000 | [diff] [blame] | 2572 | uint8_t cause, int teardown) |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 2573 | { |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2574 | union gtp_packet packet; |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2575 | unsigned int length = |
| 2576 | get_default_gtp(version, GTP_DELETE_PDP_RSP, &packet); |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 2577 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2578 | gtpie_tv1(&packet, &length, GTP_MAX, GTPIE_CAUSE, cause); |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 2579 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2580 | gtp_resp(version, gsn, pdp, &packet, length, peer, fd, |
| 2581 | get_seq(pack), get_tid(pack)); |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 2582 | |
Daniel Willmann | 6a2e825 | 2023-11-23 18:41:59 +0100 | [diff] [blame] | 2583 | if (gtp_cause_successful(cause)) { |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2584 | if ((teardown) || (version == 0)) { /* Remove all contexts */ |
Pau Espin Pedrol | 0d0b059 | 2019-05-29 20:42:09 +0200 | [diff] [blame] | 2585 | gtp_freepdp_teardown(gsn, linked_pdp); |
Pau Espin Pedrol | 8651573 | 2019-05-31 16:40:37 +0200 | [diff] [blame] | 2586 | } else { |
| 2587 | /* If we end up here (no teardown) it means we still |
| 2588 | have at least another pdp context active for this |
| 2589 | PDN connection (since last DeleteReq should come |
| 2590 | with teardown enabled). If the ctx to delete is a |
| 2591 | secondary ctx, simply free it. If it's the primary |
| 2592 | ctx, mark it as nodata but don't free it since we |
| 2593 | need it to hold data linked together and we'll |
| 2594 | require it later to tear down the entire tree. Still, |
| 2595 | we announce its deletion through cb_delete_context |
| 2596 | because we don't want user to release its related |
| 2597 | data and not use it anymore. |
| 2598 | */ |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2599 | if (pdp == linked_pdp) { |
Pau Espin Pedrol | 93dd798 | 2019-05-31 16:42:05 +0200 | [diff] [blame] | 2600 | if (gsn->cb_delete_context) |
| 2601 | gsn->cb_delete_context(pdp); |
| 2602 | pdp->secondary_tei[pdp->nsapi & 0xf0] = 0; |
| 2603 | pdp->nodata = 1; |
| 2604 | } else { |
| 2605 | gtp_freepdp(gsn, pdp); |
| 2606 | } |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2607 | } |
jjako | 2c38133 | 2003-10-21 19:09:53 +0000 | [diff] [blame] | 2608 | } |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2609 | return 0; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 2610 | } |
| 2611 | |
| 2612 | /* Handle Delete PDP Context Request */ |
| 2613 | int gtp_delete_pdp_ind(struct gsn_t *gsn, int version, |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 2614 | struct sockaddr_in *peer, int fd, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2615 | void *pack, unsigned len) |
| 2616 | { |
| 2617 | struct pdp_t *pdp = NULL; |
| 2618 | struct pdp_t *linked_pdp = NULL; |
| 2619 | union gtpie_member *ie[GTPIE_SIZE]; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 2620 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2621 | uint16_t seq = get_seq(pack); |
| 2622 | int hlen = get_hlen(pack); |
jjako | 2c38133 | 2003-10-21 19:09:53 +0000 | [diff] [blame] | 2623 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2624 | uint8_t nsapi; |
| 2625 | uint8_t teardown = 0; |
Pau Espin Pedrol | 9ee8d32 | 2019-05-30 14:11:22 +0200 | [diff] [blame] | 2626 | int count; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 2627 | |
Pau Espin Pedrol | de72d26 | 2019-05-29 18:17:05 +0200 | [diff] [blame] | 2628 | /* Is this a duplicate ? */ |
| 2629 | if (!gtp_duplicate(gsn, version, peer, seq)) { |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2630 | return 0; /* We allready send off response once */ |
| 2631 | } |
jjako | 2c38133 | 2003-10-21 19:09:53 +0000 | [diff] [blame] | 2632 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2633 | /* Find the linked context in question */ |
Pau Espin Pedrol | 9fbcb10 | 2019-05-31 16:29:32 +0200 | [diff] [blame] | 2634 | if (gtp_pdp_getgtp1(gsn, &linked_pdp, get_tei(pack))) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 2635 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_ERR_UNKNOWN_PDP); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 2636 | GTP_LOGPKG(LOGL_ERROR, peer, pack, len, |
Pau Espin Pedrol | bfd3119 | 2021-04-22 15:01:23 +0200 | [diff] [blame] | 2637 | "Unknown PDP context: TEI=0x%" PRIx32 "\n", get_tei(pack)); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2638 | return gtp_delete_pdp_resp(gsn, version, peer, fd, pack, len, |
| 2639 | NULL, NULL, GTPCAUSE_NON_EXIST, |
| 2640 | teardown); |
| 2641 | } |
jjako | 2c38133 | 2003-10-21 19:09:53 +0000 | [diff] [blame] | 2642 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2643 | /* If version 0 this is also the secondary context */ |
| 2644 | if (version == 0) |
| 2645 | pdp = linked_pdp; |
jjako | 2c38133 | 2003-10-21 19:09:53 +0000 | [diff] [blame] | 2646 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2647 | /* Decode information elements */ |
| 2648 | if (gtpie_decaps(ie, version, pack + hlen, len - hlen)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 2649 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_INVALID); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 2650 | GTP_LOGPKG(LOGL_ERROR, peer, pack, len, |
| 2651 | "Invalid message format\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2652 | if (0 == version) |
| 2653 | return EOF; |
| 2654 | else |
| 2655 | return gtp_delete_pdp_resp(gsn, version, peer, fd, pack, |
| 2656 | len, NULL, NULL, |
| 2657 | GTPCAUSE_INVALID_MESSAGE, |
| 2658 | teardown); |
| 2659 | } |
| 2660 | |
| 2661 | if (version == 1) { |
| 2662 | /* NSAPI (mandatory) */ |
| 2663 | if (gtpie_gettv1(ie, GTPIE_NSAPI, 0, &nsapi)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 2664 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_MISSING); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 2665 | GTP_LOGPKG(LOGL_ERROR, peer, pack, |
Pau Espin Pedrol | bfd3119 | 2021-04-22 15:01:23 +0200 | [diff] [blame] | 2666 | len, "Missing mandatory information field\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2667 | return gtp_delete_pdp_resp(gsn, version, peer, fd, pack, |
| 2668 | len, NULL, NULL, |
| 2669 | GTPCAUSE_MAN_IE_MISSING, |
| 2670 | teardown); |
| 2671 | } |
| 2672 | |
| 2673 | /* Find the context in question */ |
Pau Espin Pedrol | 9fbcb10 | 2019-05-31 16:29:32 +0200 | [diff] [blame] | 2674 | if (gtp_pdp_getgtp1(gsn, &pdp, linked_pdp->secondary_tei[nsapi & 0x0f])) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 2675 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_ERR_UNKNOWN_PDP); |
Pau Espin Pedrol | bfd3119 | 2021-04-22 15:01:23 +0200 | [diff] [blame] | 2676 | GTP_LOGPKG(LOGL_ERROR, peer, pack, len, |
| 2677 | "Unknown PDP context: Secondary TEI=0x%" PRIx32 "\n", |
| 2678 | linked_pdp->secondary_tei[nsapi & 0x0f]); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2679 | return gtp_delete_pdp_resp(gsn, version, peer, fd, pack, |
| 2680 | len, NULL, NULL, |
| 2681 | GTPCAUSE_NON_EXIST, |
| 2682 | teardown); |
| 2683 | } |
| 2684 | |
| 2685 | /* Teardown (conditional) */ |
| 2686 | gtpie_gettv1(ie, GTPIE_TEARDOWN, 0, &teardown); |
| 2687 | |
| 2688 | if (!teardown) { |
Pau Espin Pedrol | 742a6b5 | 2019-05-30 13:36:10 +0200 | [diff] [blame] | 2689 | /* TS 29.060 section 7.3.5: If a GSN receives a Delete PDP context |
| 2690 | * without a Teardown Indicator or with a Teardown Indicator with |
| 2691 | * value set to "0" and only that PDP context is active for a PDN |
| 2692 | * connection, then the GSN shall ignore the message. (Note: |
| 2693 | * This is symptom of a race condition. The reliable delivery of |
| 2694 | * signalling messages will eventually lead to a consistent |
| 2695 | * situation, allowing the teardown of the PDP context.) |
| 2696 | */ |
Pau Espin Pedrol | 9ee8d32 | 2019-05-30 14:11:22 +0200 | [diff] [blame] | 2697 | count = pdp_count_secondary(linked_pdp); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2698 | if (count <= 1) { |
Pau Espin Pedrol | d1bd6fc | 2018-07-13 19:11:45 +0200 | [diff] [blame] | 2699 | GTP_LOGPKG(LOGL_NOTICE, peer, pack, len, |
| 2700 | "Ignoring CTX DEL without teardown and count=%d\n", |
| 2701 | count); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2702 | return 0; /* 29.060 7.3.5 Ignore message */ |
| 2703 | } |
| 2704 | } |
| 2705 | } |
| 2706 | |
| 2707 | return gtp_delete_pdp_resp(gsn, version, peer, fd, pack, len, |
| 2708 | pdp, linked_pdp, GTPCAUSE_ACC_REQ, teardown); |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 2709 | } |
| 2710 | |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 2711 | /* Handle Delete PDP Context Response */ |
| 2712 | int gtp_delete_pdp_conf(struct gsn_t *gsn, int version, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2713 | struct sockaddr_in *peer, void *pack, unsigned len) |
| 2714 | { |
| 2715 | union gtpie_member *ie[GTPIE_SIZE]; |
| 2716 | uint8_t cause; |
| 2717 | void *cbp = NULL; |
| 2718 | uint8_t type = 0; |
Pau Espin Pedrol | 8e8c7ef | 2018-07-16 16:47:12 +0200 | [diff] [blame] | 2719 | struct pdp_t *pdp = NULL; |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2720 | int hlen = get_hlen(pack); |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 2721 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2722 | /* Remove packet from queue */ |
| 2723 | if (gtp_conf(gsn, version, peer, pack, len, &type, &cbp)) |
| 2724 | return EOF; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 2725 | |
Pau Espin Pedrol | 8e8c7ef | 2018-07-16 16:47:12 +0200 | [diff] [blame] | 2726 | /* Find the context in question. It may not be available if gtp_delete_context_req |
| 2727 | * was used and as a result the PDP ctx was already freed */ |
Pau Espin Pedrol | 9fbcb10 | 2019-05-31 16:29:32 +0200 | [diff] [blame] | 2728 | if (gtp_pdp_getgtp1(gsn, &pdp, get_tei(pack))) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 2729 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_ERR_UNKNOWN_PDP); |
Pau Espin Pedrol | 8e8c7ef | 2018-07-16 16:47:12 +0200 | [diff] [blame] | 2730 | GTP_LOGPKG(LOGL_NOTICE, peer, pack, len, |
Pau Espin Pedrol | bfd3119 | 2021-04-22 15:01:23 +0200 | [diff] [blame] | 2731 | "Unknown PDP context: TEI=0x%" PRIx32 " (expected if " |
| 2732 | "gtp_delete_context_req is used or pdp ctx was freed " |
| 2733 | "manually before response)\n", get_tei(pack)); |
Pau Espin Pedrol | 8e8c7ef | 2018-07-16 16:47:12 +0200 | [diff] [blame] | 2734 | if (gsn->cb_conf) |
| 2735 | gsn->cb_conf(type, EOF, NULL, cbp); |
| 2736 | return EOF; |
| 2737 | } |
| 2738 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2739 | /* Decode information elements */ |
| 2740 | if (gtpie_decaps(ie, version, pack + hlen, len - hlen)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 2741 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_INVALID); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 2742 | GTP_LOGPKG(LOGL_ERROR, peer, pack, len, |
| 2743 | "Invalid message format\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2744 | if (gsn->cb_conf) |
Pau Espin Pedrol | 8e8c7ef | 2018-07-16 16:47:12 +0200 | [diff] [blame] | 2745 | gsn->cb_conf(type, EOF, pdp, cbp); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2746 | return EOF; |
| 2747 | } |
| 2748 | |
| 2749 | /* Extract cause value (mandatory) */ |
| 2750 | if (gtpie_gettv1(ie, GTPIE_CAUSE, 0, &cause)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 2751 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_MISSING); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 2752 | GTP_LOGPKG(LOGL_ERROR, peer, pack, len, |
| 2753 | "Missing mandatory information field\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2754 | if (gsn->cb_conf) |
Pau Espin Pedrol | 8e8c7ef | 2018-07-16 16:47:12 +0200 | [diff] [blame] | 2755 | gsn->cb_conf(type, EOF, pdp, cbp); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2756 | return EOF; |
| 2757 | } |
| 2758 | |
| 2759 | /* Check the cause value (again) */ |
Daniel Willmann | 6a2e825 | 2023-11-23 18:41:59 +0100 | [diff] [blame] | 2760 | if (!gtp_cause_successful(cause) && (GTPCAUSE_NON_EXIST != cause)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 2761 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_ERR_UNEXPECTED_CAUSE); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 2762 | GTP_LOGPKG(LOGL_ERROR, peer, pack, len, |
| 2763 | "Unexpected cause value received: %d\n", cause); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2764 | if (gsn->cb_conf) |
Pau Espin Pedrol | 8e8c7ef | 2018-07-16 16:47:12 +0200 | [diff] [blame] | 2765 | gsn->cb_conf(type, cause, pdp, cbp); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2766 | return EOF; |
| 2767 | } |
| 2768 | |
| 2769 | /* Callback function to notify application */ |
| 2770 | if (gsn->cb_conf) |
Pau Espin Pedrol | 8e8c7ef | 2018-07-16 16:47:12 +0200 | [diff] [blame] | 2771 | gsn->cb_conf(type, cause, pdp, cbp); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2772 | |
| 2773 | return 0; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 2774 | } |
| 2775 | |
Harald Welte | 54d082e | 2017-08-12 22:43:21 +0200 | [diff] [blame] | 2776 | /* Send Error Indication (response to a GPDU message) - 3GPP TS 29.060 7.3.7 */ |
Pau Espin Pedrol | 07730bb | 2018-01-25 18:43:38 +0100 | [diff] [blame] | 2777 | static int gtp_error_ind_resp(struct gsn_t *gsn, uint8_t version, |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 2778 | struct sockaddr_in *peer, int fd, |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 2779 | void *pack, unsigned len) |
| 2780 | { |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2781 | union gtp_packet packet; |
| 2782 | unsigned int length = get_default_gtp(version, GTP_ERROR, &packet); |
| 2783 | |
Harald Welte | 54d082e | 2017-08-12 22:43:21 +0200 | [diff] [blame] | 2784 | if (version == 1) { |
| 2785 | /* Mandatory 7.7.13 TEI Data I */ |
| 2786 | gtpie_tv4(&packet, &length, GTP_MAX, GTPIE_TEI_DI, |
| 2787 | ntoh32(((union gtp_packet *)pack)->gtp1l.h.tei)); |
| 2788 | |
| 2789 | /* Mandatory 7.7.32 GSN Address */ |
| 2790 | gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_GSN_ADDR, |
| 2791 | sizeof(gsn->gsnu), &gsn->gsnu); |
| 2792 | } |
| 2793 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2794 | return gtp_resp(version, gsn, NULL, &packet, length, peer, fd, |
| 2795 | get_seq(pack), get_tid(pack)); |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 2796 | } |
| 2797 | |
| 2798 | /* Handle Error Indication */ |
Pau Espin Pedrol | 07730bb | 2018-01-25 18:43:38 +0100 | [diff] [blame] | 2799 | static int gtp_error_ind_conf(struct gsn_t *gsn, uint8_t version, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2800 | struct sockaddr_in *peer, void *pack, unsigned len) |
| 2801 | { |
Harald Welte | 37d5b15 | 2017-08-12 23:58:29 +0200 | [diff] [blame] | 2802 | union gtpie_member *ie[GTPIE_SIZE]; |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2803 | struct pdp_t *pdp; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 2804 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2805 | /* Find the context in question */ |
Harald Welte | 37d5b15 | 2017-08-12 23:58:29 +0200 | [diff] [blame] | 2806 | if (version == 0) { |
Vadim Yanitskiy | 68c5a74 | 2019-08-30 21:04:19 +0200 | [diff] [blame] | 2807 | if (gtp_pdp_tidget(gsn, &pdp, get_tid(pack))) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 2808 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_ERR_UNKNOWN_PDP); |
Harald Welte | 37d5b15 | 2017-08-12 23:58:29 +0200 | [diff] [blame] | 2809 | GTP_LOGPKG(LOGL_ERROR, peer, pack, len, |
Pau Espin Pedrol | bfd3119 | 2021-04-22 15:01:23 +0200 | [diff] [blame] | 2810 | "Unknown PDP context: TID=0x%" PRIx64 "\n", |
| 2811 | get_tid(pack)); |
Harald Welte | 37d5b15 | 2017-08-12 23:58:29 +0200 | [diff] [blame] | 2812 | return EOF; |
| 2813 | } |
| 2814 | } else if (version == 1) { |
| 2815 | /* we have to look-up based on the *peer* TEID */ |
| 2816 | int hlen = get_hlen(pack); |
| 2817 | uint32_t teid_gn; |
| 2818 | |
| 2819 | /* Decode information elements */ |
| 2820 | if (gtpie_decaps(ie, version, pack + hlen, len - hlen)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 2821 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_INVALID); |
Harald Welte | 37d5b15 | 2017-08-12 23:58:29 +0200 | [diff] [blame] | 2822 | GTP_LOGPKG(LOGL_ERROR, peer, pack, len, |
| 2823 | "Invalid message format\n"); |
| 2824 | return EOF; |
| 2825 | } |
| 2826 | |
| 2827 | if (gtpie_gettv4(ie, GTPIE_TEI_DI, 0, &teid_gn)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 2828 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_MISSING); |
Harald Welte | 37d5b15 | 2017-08-12 23:58:29 +0200 | [diff] [blame] | 2829 | GTP_LOGPKG(LOGL_ERROR, peer, pack, len, |
| 2830 | "Missing mandatory information field\n"); |
| 2831 | return EOF; |
| 2832 | } |
| 2833 | |
Pau Espin Pedrol | 9fbcb10 | 2019-05-31 16:29:32 +0200 | [diff] [blame] | 2834 | if (gtp_pdp_getgtp1_peer_d(gsn, &pdp, peer, teid_gn)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 2835 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_ERR_UNKNOWN_PDP); |
Pau Espin Pedrol | bfd3119 | 2021-04-22 15:01:23 +0200 | [diff] [blame] | 2836 | GTP_LOGPKG(LOGL_ERROR, peer, pack, len, |
| 2837 | "Unknown PDP context: Peer TEID=0x%" PRIx32 "\n", |
| 2838 | teid_gn); |
Harald Welte | 37d5b15 | 2017-08-12 23:58:29 +0200 | [diff] [blame] | 2839 | return EOF; |
| 2840 | } |
Vadim Yanitskiy | bdf2cf9 | 2019-08-30 21:23:11 +0200 | [diff] [blame] | 2841 | } else { |
| 2842 | LOGP(DLGTP, LOGL_ERROR, "Unknown version: %d\n", version); |
| 2843 | return EOF; |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2844 | } |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 2845 | |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 2846 | GTP_LOGPKG(LOGL_ERROR, peer, pack, len, |
| 2847 | "Received Error Indication\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2848 | |
Harald Welte | bd22824 | 2017-11-06 03:16:49 +0900 | [diff] [blame] | 2849 | /* This is obvious from above code, given the semantics of the |
| 2850 | * functions above, but Coverity doesn't figure this out, so |
| 2851 | * let's make it clear. It's good style anyway in case above |
| 2852 | * code should ever change. */ |
| 2853 | OSMO_ASSERT(pdp); |
| 2854 | |
Pau Espin Pedrol | 0d0b059 | 2019-05-29 20:42:09 +0200 | [diff] [blame] | 2855 | gtp_freepdp(gsn, pdp); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2856 | return 0; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 2857 | } |
| 2858 | |
Pau Espin Pedrol | 07730bb | 2018-01-25 18:43:38 +0100 | [diff] [blame] | 2859 | static int gtp_gpdu_ind(struct gsn_t *gsn, uint8_t version, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2860 | struct sockaddr_in *peer, int fd, void *pack, unsigned len) |
| 2861 | { |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 2862 | |
Pau Espin Pedrol | 282d4e3 | 2018-01-25 18:20:51 +0100 | [diff] [blame] | 2863 | int hlen; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 2864 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2865 | struct pdp_t *pdp; |
jjako | 1db1c81 | 2003-07-06 20:53:57 +0000 | [diff] [blame] | 2866 | |
Pau Espin Pedrol | 42d3250 | 2018-01-25 18:17:17 +0100 | [diff] [blame] | 2867 | switch (version) { |
| 2868 | case 0: |
Pau Espin Pedrol | bfd3119 | 2021-04-22 15:01:23 +0200 | [diff] [blame] | 2869 | if (gtp_pdp_getgtp0(gsn, &pdp, get_tei(pack))) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 2870 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_ERR_UNKNOWN_PDP); |
Pau Espin Pedrol | bfd3119 | 2021-04-22 15:01:23 +0200 | [diff] [blame] | 2871 | GTP_LOGPKG(LOGL_ERROR, peer, pack, len, |
| 2872 | "Unknown PDP context: TEI=0x%" PRIx32 "\n", |
| 2873 | get_tei(pack)); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2874 | return gtp_error_ind_resp(gsn, version, peer, fd, pack, |
| 2875 | len); |
| 2876 | } |
| 2877 | hlen = GTP0_HEADER_SIZE; |
Pau Espin Pedrol | 42d3250 | 2018-01-25 18:17:17 +0100 | [diff] [blame] | 2878 | break; |
| 2879 | case 1: |
Pau Espin Pedrol | bfd3119 | 2021-04-22 15:01:23 +0200 | [diff] [blame] | 2880 | if (gtp_pdp_getgtp1(gsn, &pdp, get_tei(pack))) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 2881 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_ERR_UNKNOWN_PDP); |
Pau Espin Pedrol | bfd3119 | 2021-04-22 15:01:23 +0200 | [diff] [blame] | 2882 | GTP_LOGPKG(LOGL_ERROR, peer, pack, len, |
| 2883 | "Unknown PDP context: TEI=0x%" PRIx32 "\n", |
| 2884 | get_tei(pack)); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2885 | return gtp_error_ind_resp(gsn, version, peer, fd, pack, |
| 2886 | len); |
| 2887 | } |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 2888 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2889 | /* Is this a long or a short header ? */ |
| 2890 | if (((union gtp_packet *)pack)->gtp1l.h.flags & 0x07) |
| 2891 | hlen = GTP1_HEADER_SIZE_LONG; |
| 2892 | else |
| 2893 | hlen = GTP1_HEADER_SIZE_SHORT; |
Pau Espin Pedrol | 42d3250 | 2018-01-25 18:17:17 +0100 | [diff] [blame] | 2894 | break; |
| 2895 | default: |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 2896 | GTP_LOGPKG(LOGL_ERROR, peer, pack, len, |
Holger Hans Peter Freyther | 01b40d0 | 2014-12-04 15:01:53 +0100 | [diff] [blame] | 2897 | "Unknown version: %d\n", version); |
Pau Espin Pedrol | 282d4e3 | 2018-01-25 18:20:51 +0100 | [diff] [blame] | 2898 | return EOF; |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2899 | } |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 2900 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2901 | /* If the GPDU was not from the peer GSN tell him to delete context */ |
| 2902 | if (memcmp(&peer->sin_addr, pdp->gsnru.v, pdp->gsnru.l)) { /* TODO Range? */ |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 2903 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_ERR_UNKNOWN_PDP); |
Max | 14b1b63 | 2017-08-21 20:14:59 +0200 | [diff] [blame] | 2904 | GTP_LOGPKG(LOGL_ERROR, peer, pack, len, "Unknown GSN peer %s\n", inet_ntoa(peer->sin_addr)); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2905 | return gtp_error_ind_resp(gsn, version, peer, fd, pack, len); |
| 2906 | } |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 2907 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2908 | /* Callback function */ |
| 2909 | if (gsn->cb_data_ind != 0) |
| 2910 | return gsn->cb_data_ind(pdp, pack + hlen, len - hlen); |
| 2911 | |
| 2912 | return 0; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 2913 | } |
| 2914 | |
Pau Espin Pedrol | 732131d | 2018-01-25 17:23:09 +0100 | [diff] [blame] | 2915 | /* Receives GTP packet and sends off for further processing |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 2916 | * Function will check the validity of the header. If the header |
Pau Espin Pedrol | 732131d | 2018-01-25 17:23:09 +0100 | [diff] [blame] | 2917 | * is not valid the packet is either dropped or a version not |
| 2918 | * supported is returned to the peer. |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 2919 | * TODO: Need to decide on return values! */ |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 2920 | int gtp_decaps0(struct gsn_t *gsn) |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 2921 | { |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2922 | unsigned char buffer[PACKET_MAX]; |
| 2923 | struct sockaddr_in peer; |
Harald Welte | d88e11d | 2011-11-02 13:09:43 +0100 | [diff] [blame] | 2924 | socklen_t peerlen; |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2925 | int status; |
| 2926 | struct gtp0_header *pheader; |
Pau Espin Pedrol | a4aada0 | 2018-01-25 17:24:38 +0100 | [diff] [blame] | 2927 | uint8_t version; |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2928 | int fd = gsn->fd0; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 2929 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2930 | /* TODO: Need strategy of userspace buffering and blocking */ |
| 2931 | /* Currently read is non-blocking and send is blocking. */ |
| 2932 | /* This means that the program have to wait for busy send calls... */ |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 2933 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2934 | while (1) { /* Loop until no more to read */ |
| 2935 | if (fcntl(gsn->fd0, F_SETFL, O_NONBLOCK)) { |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 2936 | LOGP(DLGTP, LOGL_ERROR, "fnctl()\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2937 | return -1; |
| 2938 | } |
| 2939 | peerlen = sizeof(peer); |
| 2940 | if ((status = |
| 2941 | recvfrom(gsn->fd0, buffer, sizeof(buffer), 0, |
| 2942 | (struct sockaddr *)&peer, &peerlen)) < 0) { |
| 2943 | if (errno == EAGAIN) |
| 2944 | return 0; |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 2945 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_ERR_READFROM); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 2946 | LOGP(DLGTP, LOGL_ERROR, |
Alexander Huemer | db852a1 | 2015-11-06 20:59:01 +0100 | [diff] [blame] | 2947 | "recvfrom(fd0=%d, buffer=%lx, len=%zu) failed: status = %d error = %s\n", |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2948 | gsn->fd0, (unsigned long)buffer, sizeof(buffer), |
| 2949 | status, status ? strerror(errno) : "No error"); |
| 2950 | return -1; |
| 2951 | } |
jjako | 1db1c81 | 2003-07-06 20:53:57 +0000 | [diff] [blame] | 2952 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2953 | /* Need at least 1 byte in order to check version */ |
| 2954 | if (status < (1)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 2955 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_EMPTY); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 2956 | GTP_LOGPKG(LOGL_ERROR, &peer, buffer, |
| 2957 | status, "Discarding packet - too small\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2958 | continue; |
| 2959 | } |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 2960 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2961 | pheader = (struct gtp0_header *)(buffer); |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 2962 | |
Pau Espin Pedrol | a4aada0 | 2018-01-25 17:24:38 +0100 | [diff] [blame] | 2963 | version = GTPHDR_F_GET_VER(pheader->flags); |
| 2964 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2965 | /* Version should be gtp0 (or earlier) */ |
| 2966 | /* 09.60 is somewhat unclear on this issue. On gsn->fd0 we expect only */ |
| 2967 | /* GTP 0 messages. If other version message is received we reply that we */ |
| 2968 | /* only support version 0, implying that this is the only version */ |
| 2969 | /* supported on this port */ |
Pau Espin Pedrol | a4aada0 | 2018-01-25 17:24:38 +0100 | [diff] [blame] | 2970 | if (version > 0) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 2971 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_UNSUP); |
Pau Espin Pedrol | a884a95 | 2018-01-25 17:28:11 +0100 | [diff] [blame] | 2972 | GTP_LOGPKG(LOGL_ERROR, &peer, buffer, status, |
| 2973 | "Unsupported GTP version %"PRIu8"\n", version); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2974 | gtp_unsup_req(gsn, 0, &peer, gsn->fd0, buffer, status); /* 29.60: 11.1.1 */ |
| 2975 | continue; |
| 2976 | } |
| 2977 | |
| 2978 | /* Check length of gtp0 packet */ |
| 2979 | if (status < GTP0_HEADER_SIZE) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 2980 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_TOOSHORT); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 2981 | GTP_LOGPKG(LOGL_ERROR, &peer, buffer, |
| 2982 | status, "GTP0 packet too short\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2983 | continue; /* Silently discard 29.60: 11.1.2 */ |
| 2984 | } |
| 2985 | |
| 2986 | /* Check packet length field versus length of packet */ |
| 2987 | if (status != (ntoh16(pheader->length) + GTP0_HEADER_SIZE)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 2988 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_TOOSHORT); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 2989 | GTP_LOGPKG(LOGL_ERROR, &peer, buffer, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2990 | status, |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 2991 | "GTP packet length field does not match actual length\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 2992 | continue; /* Silently discard */ |
| 2993 | } |
| 2994 | |
| 2995 | if ((gsn->mode == GTP_MODE_GGSN) && |
| 2996 | ((pheader->type == GTP_CREATE_PDP_RSP) || |
Pau Espin Pedrol | a32e4c4 | 2018-07-13 19:05:00 +0200 | [diff] [blame] | 2997 | (pheader->type == GTP_UPDATE_PDP_RSP))) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 2998 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_UNEXPECT); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 2999 | GTP_LOGPKG(LOGL_ERROR, &peer, buffer, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3000 | status, |
Pau Espin Pedrol | 3b84e92 | 2018-07-13 18:32:35 +0200 | [diff] [blame] | 3001 | "Unexpected GTPv0 Signalling Message '%s'\n", |
| 3002 | get_value_string(gtp_type_names, pheader->type)); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3003 | continue; /* Silently discard 29.60: 11.1.4 */ |
| 3004 | } |
| 3005 | |
| 3006 | if ((gsn->mode == GTP_MODE_SGSN) && |
| 3007 | ((pheader->type == GTP_CREATE_PDP_REQ) || |
Pau Espin Pedrol | a32e4c4 | 2018-07-13 19:05:00 +0200 | [diff] [blame] | 3008 | (pheader->type == GTP_UPDATE_PDP_REQ))) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 3009 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_UNEXPECT); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 3010 | GTP_LOGPKG(LOGL_ERROR, &peer, buffer, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3011 | status, |
Pau Espin Pedrol | 3b84e92 | 2018-07-13 18:32:35 +0200 | [diff] [blame] | 3012 | "Unexpected GTPv0 Signalling Message '%s'\n", |
| 3013 | get_value_string(gtp_type_names, pheader->type)); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3014 | continue; /* Silently discard 29.60: 11.1.4 */ |
| 3015 | } |
| 3016 | |
| 3017 | switch (pheader->type) { |
| 3018 | case GTP_ECHO_REQ: |
| 3019 | gtp_echo_ind(gsn, version, &peer, fd, buffer, status); |
| 3020 | break; |
| 3021 | case GTP_ECHO_RSP: |
| 3022 | gtp_echo_conf(gsn, version, &peer, buffer, status); |
| 3023 | break; |
| 3024 | case GTP_NOT_SUPPORTED: |
| 3025 | gtp_unsup_ind(gsn, &peer, buffer, status); |
| 3026 | break; |
| 3027 | case GTP_CREATE_PDP_REQ: |
| 3028 | gtp_create_pdp_ind(gsn, version, &peer, fd, buffer, |
| 3029 | status); |
| 3030 | break; |
| 3031 | case GTP_CREATE_PDP_RSP: |
| 3032 | gtp_create_pdp_conf(gsn, version, &peer, buffer, |
| 3033 | status); |
| 3034 | break; |
| 3035 | case GTP_UPDATE_PDP_REQ: |
| 3036 | gtp_update_pdp_ind(gsn, version, &peer, fd, buffer, |
| 3037 | status); |
| 3038 | break; |
| 3039 | case GTP_UPDATE_PDP_RSP: |
| 3040 | gtp_update_pdp_conf(gsn, version, &peer, buffer, |
| 3041 | status); |
| 3042 | break; |
| 3043 | case GTP_DELETE_PDP_REQ: |
| 3044 | gtp_delete_pdp_ind(gsn, version, &peer, fd, buffer, |
| 3045 | status); |
| 3046 | break; |
| 3047 | case GTP_DELETE_PDP_RSP: |
| 3048 | gtp_delete_pdp_conf(gsn, version, &peer, buffer, |
| 3049 | status); |
| 3050 | break; |
| 3051 | case GTP_ERROR: |
| 3052 | gtp_error_ind_conf(gsn, version, &peer, buffer, status); |
| 3053 | break; |
| 3054 | case GTP_GPDU: |
| 3055 | gtp_gpdu_ind(gsn, version, &peer, fd, buffer, status); |
| 3056 | break; |
| 3057 | default: |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 3058 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_UNKNOWN); |
Holger Hans Peter Freyther | 01b40d0 | 2014-12-04 15:01:53 +0100 | [diff] [blame] | 3059 | GTP_LOGPKG(LOGL_ERROR, &peer, buffer, status, |
| 3060 | "Unknown GTP message type received: %d\n", |
| 3061 | pheader->type); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3062 | break; |
| 3063 | } |
| 3064 | } |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 3065 | } |
| 3066 | |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 3067 | int gtp_decaps1c(struct gsn_t *gsn) |
| 3068 | { |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3069 | unsigned char buffer[PACKET_MAX]; |
| 3070 | struct sockaddr_in peer; |
Harald Welte | d88e11d | 2011-11-02 13:09:43 +0100 | [diff] [blame] | 3071 | socklen_t peerlen; |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3072 | int status; |
| 3073 | struct gtp1_header_short *pheader; |
Pau Espin Pedrol | a4aada0 | 2018-01-25 17:24:38 +0100 | [diff] [blame] | 3074 | uint8_t version; |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3075 | int fd = gsn->fd1c; |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 3076 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3077 | /* TODO: Need strategy of userspace buffering and blocking */ |
| 3078 | /* Currently read is non-blocking and send is blocking. */ |
| 3079 | /* This means that the program have to wait for busy send calls... */ |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 3080 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3081 | while (1) { /* Loop until no more to read */ |
| 3082 | if (fcntl(fd, F_SETFL, O_NONBLOCK)) { |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 3083 | LOGP(DLGTP, LOGL_ERROR, "fnctl()\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3084 | return -1; |
| 3085 | } |
| 3086 | peerlen = sizeof(peer); |
| 3087 | if ((status = |
| 3088 | recvfrom(fd, buffer, sizeof(buffer), 0, |
| 3089 | (struct sockaddr *)&peer, &peerlen)) < 0) { |
| 3090 | if (errno == EAGAIN) |
| 3091 | return 0; |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 3092 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_ERR_READFROM); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 3093 | LOGP(DLGTP, LOGL_ERROR, |
Alexander Huemer | db852a1 | 2015-11-06 20:59:01 +0100 | [diff] [blame] | 3094 | "recvfrom(fd=%d, buffer=%lx, len=%zu) failed: status = %d error = %s\n", |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3095 | fd, (unsigned long)buffer, sizeof(buffer), |
| 3096 | status, status ? strerror(errno) : "No error"); |
| 3097 | return -1; |
| 3098 | } |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 3099 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3100 | /* Need at least 1 byte in order to check version */ |
| 3101 | if (status < (1)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 3102 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_EMPTY); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 3103 | GTP_LOGPKG(LOGL_ERROR, &peer, buffer, |
| 3104 | status, "Discarding packet - too small\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3105 | continue; |
| 3106 | } |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 3107 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3108 | pheader = (struct gtp1_header_short *)(buffer); |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 3109 | |
Pau Espin Pedrol | a4aada0 | 2018-01-25 17:24:38 +0100 | [diff] [blame] | 3110 | version = GTPHDR_F_GET_VER(pheader->flags); |
| 3111 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3112 | /* Version must be no larger than GTP 1 */ |
Pau Espin Pedrol | a4aada0 | 2018-01-25 17:24:38 +0100 | [diff] [blame] | 3113 | if (version > 1) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 3114 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_UNSUP); |
Pau Espin Pedrol | a884a95 | 2018-01-25 17:28:11 +0100 | [diff] [blame] | 3115 | GTP_LOGPKG(LOGL_ERROR, &peer, buffer, status, |
| 3116 | "Unsupported GTP version %"PRIu8"\n", version); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3117 | gtp_unsup_req(gsn, version, &peer, fd, buffer, status); |
| 3118 | /*29.60: 11.1.1 */ |
| 3119 | continue; |
| 3120 | } |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 3121 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3122 | /* Version must be at least GTP 1 */ |
| 3123 | /* 29.060 is somewhat unclear on this issue. On gsn->fd1c we expect only */ |
| 3124 | /* GTP 1 messages. If GTP 0 message is received we silently discard */ |
| 3125 | /* the message */ |
Pau Espin Pedrol | a4aada0 | 2018-01-25 17:24:38 +0100 | [diff] [blame] | 3126 | if (version < 1) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 3127 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_UNSUP); |
Pau Espin Pedrol | a884a95 | 2018-01-25 17:28:11 +0100 | [diff] [blame] | 3128 | GTP_LOGPKG(LOGL_ERROR, &peer, buffer, status, |
| 3129 | "Unsupported GTP version %"PRIu8"\n", version); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3130 | continue; |
| 3131 | } |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 3132 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3133 | /* Check packet flag field */ |
| 3134 | if (((pheader->flags & 0xf7) != 0x32)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 3135 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_UNSUP); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 3136 | GTP_LOGPKG(LOGL_ERROR, &peer, buffer, |
Harald Welte | d37b80a | 2016-12-15 18:33:15 +0100 | [diff] [blame] | 3137 | status, "Unsupported packet flags: 0x%02x\n", pheader->flags); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3138 | continue; |
| 3139 | } |
jjako | 2c38133 | 2003-10-21 19:09:53 +0000 | [diff] [blame] | 3140 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3141 | /* Check length of packet */ |
| 3142 | if (status < GTP1_HEADER_SIZE_LONG) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 3143 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_TOOSHORT); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 3144 | GTP_LOGPKG(LOGL_ERROR, &peer, buffer, |
| 3145 | status, "GTP packet too short\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3146 | continue; /* Silently discard 29.60: 11.1.2 */ |
| 3147 | } |
jjako | 2c38133 | 2003-10-21 19:09:53 +0000 | [diff] [blame] | 3148 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3149 | /* Check packet length field versus length of packet */ |
| 3150 | if (status != |
| 3151 | (ntoh16(pheader->length) + GTP1_HEADER_SIZE_SHORT)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 3152 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_TOOSHORT); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 3153 | GTP_LOGPKG(LOGL_ERROR, &peer, buffer, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3154 | status, |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 3155 | "GTP packet length field does not match actual length\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3156 | continue; /* Silently discard */ |
| 3157 | } |
jjako | 1db1c81 | 2003-07-06 20:53:57 +0000 | [diff] [blame] | 3158 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3159 | /* Check for extension headers */ |
| 3160 | /* TODO: We really should cycle through the headers and determine */ |
| 3161 | /* if any have the comprehension required flag set */ |
Harald Welte | fed598f | 2017-09-24 16:39:22 +0800 | [diff] [blame] | 3162 | if (((pheader->flags & GTP1HDR_F_EXT) != 0x00)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 3163 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_UNSUP); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 3164 | GTP_LOGPKG(LOGL_ERROR, &peer, buffer, |
| 3165 | status, "Unsupported extension header\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3166 | gtp_extheader_req(gsn, version, &peer, fd, buffer, |
| 3167 | status); |
jjako | 1db1c81 | 2003-07-06 20:53:57 +0000 | [diff] [blame] | 3168 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3169 | continue; |
| 3170 | } |
| 3171 | |
| 3172 | if ((gsn->mode == GTP_MODE_GGSN) && |
| 3173 | ((pheader->type == GTP_CREATE_PDP_RSP) || |
Pau Espin Pedrol | a32e4c4 | 2018-07-13 19:05:00 +0200 | [diff] [blame] | 3174 | (pheader->type == GTP_UPDATE_PDP_RSP))) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 3175 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_UNEXPECT); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 3176 | GTP_LOGPKG(LOGL_ERROR, &peer, buffer, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3177 | status, |
Pau Espin Pedrol | 3b84e92 | 2018-07-13 18:32:35 +0200 | [diff] [blame] | 3178 | "Unexpected GTPv1 Signalling Message '%s'\n", |
| 3179 | get_value_string(gtp_type_names, pheader->type)); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3180 | continue; /* Silently discard 29.60: 11.1.4 */ |
| 3181 | } |
| 3182 | |
| 3183 | if ((gsn->mode == GTP_MODE_SGSN) && |
| 3184 | ((pheader->type == GTP_CREATE_PDP_REQ) || |
Pau Espin Pedrol | a32e4c4 | 2018-07-13 19:05:00 +0200 | [diff] [blame] | 3185 | (pheader->type == GTP_UPDATE_PDP_REQ))) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 3186 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_UNEXPECT); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 3187 | GTP_LOGPKG(LOGL_ERROR, &peer, buffer, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3188 | status, |
Pau Espin Pedrol | 3b84e92 | 2018-07-13 18:32:35 +0200 | [diff] [blame] | 3189 | "Unexpected GTPv1 Signalling Message '%s'\n", |
| 3190 | get_value_string(gtp_type_names, pheader->type)); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3191 | continue; /* Silently discard 29.60: 11.1.4 */ |
| 3192 | } |
| 3193 | |
| 3194 | switch (pheader->type) { |
| 3195 | case GTP_ECHO_REQ: |
| 3196 | gtp_echo_ind(gsn, version, &peer, fd, buffer, status); |
| 3197 | break; |
| 3198 | case GTP_ECHO_RSP: |
| 3199 | gtp_echo_conf(gsn, version, &peer, buffer, status); |
| 3200 | break; |
| 3201 | case GTP_NOT_SUPPORTED: |
| 3202 | gtp_unsup_ind(gsn, &peer, buffer, status); |
| 3203 | break; |
| 3204 | case GTP_SUPP_EXT_HEADER: |
| 3205 | gtp_extheader_ind(gsn, &peer, buffer, status); |
| 3206 | break; |
| 3207 | case GTP_CREATE_PDP_REQ: |
| 3208 | gtp_create_pdp_ind(gsn, version, &peer, fd, buffer, |
| 3209 | status); |
| 3210 | break; |
| 3211 | case GTP_CREATE_PDP_RSP: |
| 3212 | gtp_create_pdp_conf(gsn, version, &peer, buffer, |
| 3213 | status); |
| 3214 | break; |
| 3215 | case GTP_UPDATE_PDP_REQ: |
| 3216 | gtp_update_pdp_ind(gsn, version, &peer, fd, buffer, |
| 3217 | status); |
| 3218 | break; |
| 3219 | case GTP_UPDATE_PDP_RSP: |
| 3220 | gtp_update_pdp_conf(gsn, version, &peer, buffer, |
| 3221 | status); |
| 3222 | break; |
| 3223 | case GTP_DELETE_PDP_REQ: |
| 3224 | gtp_delete_pdp_ind(gsn, version, &peer, fd, buffer, |
| 3225 | status); |
| 3226 | break; |
| 3227 | case GTP_DELETE_PDP_RSP: |
| 3228 | gtp_delete_pdp_conf(gsn, version, &peer, buffer, |
| 3229 | status); |
| 3230 | break; |
| 3231 | case GTP_ERROR: |
| 3232 | gtp_error_ind_conf(gsn, version, &peer, buffer, status); |
| 3233 | break; |
Pau Espin Pedrol | f32c6a9 | 2021-05-03 17:58:55 +0200 | [diff] [blame] | 3234 | case GTP_RAN_INFO_RELAY: |
| 3235 | gtp_ran_info_relay_ind(gsn, version, &peer, buffer, status); |
| 3236 | break; |
Daniel Willmann | 6536376 | 2024-01-26 16:36:20 +0100 | [diff] [blame] | 3237 | case GTP_SGSN_CONTEXT_REQ: |
| 3238 | gtp_sgsn_context_ind(gsn, version, &peer, buffer, status); |
| 3239 | break; |
| 3240 | case GTP_SGSN_CONTEXT_RSP: |
| 3241 | gtp_sgsn_context_conf_ind(gsn, version, &peer, buffer, status); |
| 3242 | break; |
| 3243 | case GTP_SGSN_CONTEXT_ACK: |
| 3244 | gtp_sgsn_context_ack(gsn, version, &peer, buffer, status); |
| 3245 | break; |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3246 | default: |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 3247 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_UNKNOWN); |
Holger Hans Peter Freyther | 01b40d0 | 2014-12-04 15:01:53 +0100 | [diff] [blame] | 3248 | GTP_LOGPKG(LOGL_ERROR, &peer, buffer, status, |
| 3249 | "Unknown GTP message type received: %u\n", |
| 3250 | pheader->type); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3251 | break; |
| 3252 | } |
| 3253 | } |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 3254 | } |
| 3255 | |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 3256 | int gtp_decaps1u(struct gsn_t *gsn) |
| 3257 | { |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3258 | unsigned char buffer[PACKET_MAX]; |
| 3259 | struct sockaddr_in peer; |
Harald Welte | d88e11d | 2011-11-02 13:09:43 +0100 | [diff] [blame] | 3260 | socklen_t peerlen; |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3261 | int status; |
| 3262 | struct gtp1_header_short *pheader; |
Pau Espin Pedrol | a4aada0 | 2018-01-25 17:24:38 +0100 | [diff] [blame] | 3263 | uint8_t version; |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3264 | int fd = gsn->fd1u; |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 3265 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3266 | /* TODO: Need strategy of userspace buffering and blocking */ |
| 3267 | /* Currently read is non-blocking and send is blocking. */ |
| 3268 | /* This means that the program have to wait for busy send calls... */ |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 3269 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3270 | while (1) { /* Loop until no more to read */ |
| 3271 | if (fcntl(gsn->fd1u, F_SETFL, O_NONBLOCK)) { |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 3272 | LOGP(DLGTP, LOGL_ERROR, "fnctl()\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3273 | return -1; |
| 3274 | } |
| 3275 | peerlen = sizeof(peer); |
| 3276 | if ((status = |
| 3277 | recvfrom(gsn->fd1u, buffer, sizeof(buffer), 0, |
| 3278 | (struct sockaddr *)&peer, &peerlen)) < 0) { |
| 3279 | if (errno == EAGAIN) |
| 3280 | return 0; |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 3281 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_ERR_READFROM); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 3282 | LOGP(DLGTP, LOGL_ERROR, |
Alexander Huemer | db852a1 | 2015-11-06 20:59:01 +0100 | [diff] [blame] | 3283 | "recvfrom(fd1u=%d, buffer=%lx, len=%zu) failed: status = %d error = %s\n", |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3284 | gsn->fd1u, (unsigned long)buffer, |
| 3285 | sizeof(buffer), status, |
| 3286 | status ? strerror(errno) : "No error"); |
| 3287 | return -1; |
| 3288 | } |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 3289 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3290 | /* Need at least 1 byte in order to check version */ |
| 3291 | if (status < (1)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 3292 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_EMPTY); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 3293 | GTP_LOGPKG(LOGL_ERROR, &peer, buffer, |
| 3294 | status, "Discarding packet - too small\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3295 | continue; |
| 3296 | } |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 3297 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3298 | pheader = (struct gtp1_header_short *)(buffer); |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 3299 | |
Pau Espin Pedrol | a4aada0 | 2018-01-25 17:24:38 +0100 | [diff] [blame] | 3300 | version = GTPHDR_F_GET_VER(pheader->flags); |
| 3301 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3302 | /* Version must be no larger than GTP 1 */ |
Pau Espin Pedrol | a4aada0 | 2018-01-25 17:24:38 +0100 | [diff] [blame] | 3303 | if (version > 1) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 3304 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_UNSUP); |
Pau Espin Pedrol | a884a95 | 2018-01-25 17:28:11 +0100 | [diff] [blame] | 3305 | GTP_LOGPKG(LOGL_ERROR, &peer, buffer, status, |
| 3306 | "Unsupported GTP version %"PRIu8"\n", version); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3307 | gtp_unsup_req(gsn, 1, &peer, gsn->fd1c, buffer, status); /*29.60: 11.1.1 */ |
| 3308 | continue; |
| 3309 | } |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 3310 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3311 | /* Version must be at least GTP 1 */ |
| 3312 | /* 29.060 is somewhat unclear on this issue. On gsn->fd1c we expect only */ |
| 3313 | /* GTP 1 messages. If GTP 0 message is received we silently discard */ |
| 3314 | /* the message */ |
Pau Espin Pedrol | a4aada0 | 2018-01-25 17:24:38 +0100 | [diff] [blame] | 3315 | if (version < 1) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 3316 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_UNSUP); |
Pau Espin Pedrol | a884a95 | 2018-01-25 17:28:11 +0100 | [diff] [blame] | 3317 | GTP_LOGPKG(LOGL_ERROR, &peer, buffer, status, |
| 3318 | "Unsupported GTP version %"PRIu8"\n", version); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3319 | continue; |
| 3320 | } |
jjako | 2c38133 | 2003-10-21 19:09:53 +0000 | [diff] [blame] | 3321 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3322 | /* Check packet flag field (allow both with and without sequence number) */ |
| 3323 | if (((pheader->flags & 0xf5) != 0x30)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 3324 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_UNSUP); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 3325 | GTP_LOGPKG(LOGL_ERROR, &peer, buffer, |
Harald Welte | d37b80a | 2016-12-15 18:33:15 +0100 | [diff] [blame] | 3326 | status, "Unsupported packet flags 0x%02x\n", pheader->flags); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3327 | continue; |
| 3328 | } |
jjako | 2c38133 | 2003-10-21 19:09:53 +0000 | [diff] [blame] | 3329 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3330 | /* Check length of packet */ |
| 3331 | if (status < GTP1_HEADER_SIZE_SHORT) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 3332 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_TOOSHORT); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 3333 | GTP_LOGPKG(LOGL_ERROR, &peer, buffer, |
| 3334 | status, "GTP packet too short\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3335 | continue; /* Silently discard 29.60: 11.1.2 */ |
| 3336 | } |
| 3337 | |
| 3338 | /* Check packet length field versus length of packet */ |
| 3339 | if (status != |
| 3340 | (ntoh16(pheader->length) + GTP1_HEADER_SIZE_SHORT)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 3341 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_TOOSHORT); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 3342 | GTP_LOGPKG(LOGL_ERROR, &peer, buffer, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3343 | status, |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 3344 | "GTP packet length field does not match actual length\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3345 | continue; /* Silently discard */ |
| 3346 | } |
| 3347 | |
| 3348 | /* Check for extension headers */ |
| 3349 | /* TODO: We really should cycle through the headers and determine */ |
| 3350 | /* if any have the comprehension required flag set */ |
Harald Welte | fed598f | 2017-09-24 16:39:22 +0800 | [diff] [blame] | 3351 | if (((pheader->flags & GTP1HDR_F_EXT) != 0x00)) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 3352 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_UNSUP); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 3353 | GTP_LOGPKG(LOGL_ERROR, &peer, buffer, |
| 3354 | status, "Unsupported extension header\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3355 | gtp_extheader_req(gsn, version, &peer, fd, buffer, |
| 3356 | status); |
| 3357 | |
| 3358 | continue; |
| 3359 | } |
| 3360 | |
| 3361 | switch (pheader->type) { |
| 3362 | case GTP_ECHO_REQ: |
| 3363 | gtp_echo_ind(gsn, version, &peer, fd, buffer, status); |
| 3364 | break; |
| 3365 | case GTP_ECHO_RSP: |
| 3366 | gtp_echo_conf(gsn, version, &peer, buffer, status); |
| 3367 | break; |
| 3368 | case GTP_SUPP_EXT_HEADER: |
| 3369 | gtp_extheader_ind(gsn, &peer, buffer, status); |
| 3370 | break; |
| 3371 | case GTP_ERROR: |
| 3372 | gtp_error_ind_conf(gsn, version, &peer, buffer, status); |
| 3373 | break; |
| 3374 | /* Supported header extensions */ |
| 3375 | case GTP_GPDU: |
| 3376 | gtp_gpdu_ind(gsn, version, &peer, fd, buffer, status); |
| 3377 | break; |
| 3378 | default: |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 3379 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_PKT_UNKNOWN); |
Holger Hans Peter Freyther | 01b40d0 | 2014-12-04 15:01:53 +0100 | [diff] [blame] | 3380 | GTP_LOGPKG(LOGL_ERROR, &peer, buffer, status, |
| 3381 | "Unknown GTP message type received: %u\n", |
| 3382 | pheader->type); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3383 | break; |
| 3384 | } |
| 3385 | } |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 3386 | } |
| 3387 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3388 | int gtp_data_req(struct gsn_t *gsn, struct pdp_t *pdp, void *pack, unsigned len) |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 3389 | { |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3390 | union gtp_packet packet; |
| 3391 | struct sockaddr_in addr; |
Harald Welte | 471e349 | 2017-09-24 16:12:39 +0800 | [diff] [blame] | 3392 | struct msghdr msgh; |
| 3393 | struct iovec iov[2]; |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3394 | int fd; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 3395 | |
Harald Welte | 471e349 | 2017-09-24 16:12:39 +0800 | [diff] [blame] | 3396 | /* prepare destination address */ |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3397 | memset(&addr, 0, sizeof(addr)); |
| 3398 | addr.sin_family = AF_INET; |
jjako | 0fe0df0 | 2004-09-17 11:30:40 +0000 | [diff] [blame] | 3399 | #if defined(__FreeBSD__) || defined(__APPLE__) |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3400 | addr.sin_len = sizeof(addr); |
jjako | 06e9f12 | 2004-01-19 18:37:58 +0000 | [diff] [blame] | 3401 | #endif |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3402 | memcpy(&addr.sin_addr, pdp->gsnru.v, pdp->gsnru.l); /* TODO range check */ |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 3403 | |
Harald Welte | 471e349 | 2017-09-24 16:12:39 +0800 | [diff] [blame] | 3404 | /* prepare msghdr */ |
| 3405 | memset(&msgh, 0, sizeof(msgh)); |
| 3406 | msgh.msg_name = &addr; |
| 3407 | msgh.msg_namelen = sizeof(addr); |
| 3408 | msgh.msg_iov = iov; |
| 3409 | msgh.msg_iovlen = ARRAY_SIZE(iov); |
| 3410 | |
| 3411 | /* prepare iovectors */ |
| 3412 | iov[0].iov_base = &packet; |
| 3413 | /* iov[0].iov_len is not known here yet */ |
| 3414 | iov[1].iov_base = pack; |
| 3415 | iov[1].iov_len = len; |
| 3416 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3417 | if (pdp->version == 0) { |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 3418 | |
Harald Welte | 471e349 | 2017-09-24 16:12:39 +0800 | [diff] [blame] | 3419 | iov[0].iov_len = GTP0_HEADER_SIZE; |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3420 | addr.sin_port = htons(GTP0_PORT); |
| 3421 | fd = gsn->fd0; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 3422 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3423 | get_default_gtp(0, GTP_GPDU, &packet); |
| 3424 | packet.gtp0.h.length = hton16(len); |
Harald Welte | 3c1cce2 | 2017-09-24 16:40:12 +0800 | [diff] [blame] | 3425 | if (pdp->tx_gpdu_seq) |
| 3426 | packet.gtp0.h.seq = hton16(pdp->gtpsntx++); |
| 3427 | else |
| 3428 | packet.gtp0.h.seq = 0; |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3429 | packet.gtp0.h.flow = hton16(pdp->flru); |
Pablo Neira Ayuso | 746b944 | 2014-03-24 17:58:27 +0100 | [diff] [blame] | 3430 | packet.gtp0.h.tid = htobe64(pdp_gettid(pdp->imsi, pdp->nsapi)); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3431 | } else if (pdp->version == 1) { |
jjako | 08d331d | 2003-10-13 20:33:30 +0000 | [diff] [blame] | 3432 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3433 | addr.sin_port = htons(GTP1U_PORT); |
| 3434 | fd = gsn->fd1u; |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 3435 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3436 | get_default_gtp(1, GTP_GPDU, &packet); |
Harald Welte | 3c1cce2 | 2017-09-24 16:40:12 +0800 | [diff] [blame] | 3437 | if (pdp->tx_gpdu_seq) { |
| 3438 | packet.gtp1l.h.seq = hton16(pdp->gtpsntx++); |
| 3439 | packet.gtp1l.h.length = hton16(len - GTP1_HEADER_SIZE_SHORT + |
| 3440 | GTP1_HEADER_SIZE_LONG); |
| 3441 | packet.gtp1l.h.tei = hton32(pdp->teid_gn); |
| 3442 | iov[0].iov_len = GTP1_HEADER_SIZE_LONG; |
| 3443 | } else { |
| 3444 | packet.gtp1s.h.flags &= ~GTP1HDR_F_SEQ; |
| 3445 | packet.gtp1s.h.length = hton16(len); |
| 3446 | packet.gtp1s.h.tei = hton32(pdp->teid_gn); |
| 3447 | iov[0].iov_len = GTP1_HEADER_SIZE_SHORT; |
| 3448 | } |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3449 | } else { |
Holger Hans Peter Freyther | 01b40d0 | 2014-12-04 15:01:53 +0100 | [diff] [blame] | 3450 | LOGP(DLGTP, LOGL_ERROR, "Unknown version: %d\n", pdp->version); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3451 | return EOF; |
| 3452 | } |
| 3453 | |
| 3454 | if (fcntl(fd, F_SETFL, 0)) { |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 3455 | LOGP(DLGTP, LOGL_ERROR, "fnctl()\n"); |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3456 | return -1; |
| 3457 | } |
| 3458 | |
Harald Welte | 471e349 | 2017-09-24 16:12:39 +0800 | [diff] [blame] | 3459 | if (sendmsg(fd, &msgh, 0) < 0) { |
Pau Espin Pedrol | b9036af | 2022-11-02 18:17:56 +0100 | [diff] [blame] | 3460 | rate_ctr_inc2(gsn->ctrg, GSN_CTR_ERR_SENDTO); |
Holger Hans Peter Freyther | 42ca1d1 | 2014-12-03 20:18:43 +0100 | [diff] [blame] | 3461 | LOGP(DLGTP, LOGL_ERROR, |
Harald Welte | 471e349 | 2017-09-24 16:12:39 +0800 | [diff] [blame] | 3462 | "sendmsg(fd=%d, msg=%lx, len=%d) failed: Error = %s\n", fd, |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3463 | (unsigned long)&packet, GTP0_HEADER_SIZE + len, |
| 3464 | strerror(errno)); |
| 3465 | return EOF; |
| 3466 | } |
| 3467 | return 0; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 3468 | } |
| 3469 | |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 3470 | /* *********************************************************** |
| 3471 | * Conversion functions |
| 3472 | *************************************************************/ |
| 3473 | |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 3474 | /* *********************************************************** |
| 3475 | * IP address conversion functions |
| 3476 | * There exist several types of address representations: |
Pau Espin Pedrol | 732131d | 2018-01-25 17:23:09 +0100 | [diff] [blame] | 3477 | * - eua: End User Address. (29.060, 7.7.27, message type 128) |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 3478 | * Used for signalling address to mobile station. Supports IPv4 |
| 3479 | * IPv6 x.25 etc. etc. |
| 3480 | * - gsna: GSN Address. (29.060, 7.7.32, message type 133): IP address |
| 3481 | * of GSN. If length is 4 it is IPv4. If length is 16 it is IPv6. |
| 3482 | * - in_addr: IPv4 address struct. |
| 3483 | * - sockaddr_in: Socket API representation of IP address and |
| 3484 | * port number. |
| 3485 | *************************************************************/ |
| 3486 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3487 | int ipv42eua(struct ul66_t *eua, struct in_addr *src) |
| 3488 | { |
Harald Welte | cee7546 | 2017-09-24 17:45:05 +0800 | [diff] [blame] | 3489 | eua->v[0] = PDP_EUA_ORG_IETF; |
| 3490 | eua->v[1] = PDP_EUA_TYPE_v4; |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3491 | if (src) { |
| 3492 | eua->l = 6; |
| 3493 | memcpy(&eua->v[2], src, 4); |
| 3494 | } else { |
| 3495 | eua->l = 2; |
| 3496 | } |
| 3497 | return 0; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 3498 | } |
| 3499 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3500 | int eua2ipv4(struct in_addr *dst, struct ul66_t *eua) |
| 3501 | { |
Harald Welte | cee7546 | 2017-09-24 17:45:05 +0800 | [diff] [blame] | 3502 | if ((eua->l != 6) || (eua->v[0] != PDP_EUA_ORG_IETF) || (eua->v[1] != PDP_EUA_TYPE_v4)) |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3503 | return -1; /* Not IPv4 address */ |
| 3504 | memcpy(dst, &eua->v[2], 4); |
| 3505 | return 0; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 3506 | } |
| 3507 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3508 | int gsna2in_addr(struct in_addr *dst, struct ul16_t *gsna) |
| 3509 | { |
| 3510 | memset(dst, 0, sizeof(struct in_addr)); |
| 3511 | if (gsna->l != 4) |
| 3512 | return EOF; /* Return if not IPv4 */ |
| 3513 | memcpy(dst, gsna->v, gsna->l); |
| 3514 | return 0; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 3515 | } |
| 3516 | |
Harald Welte | bed35df | 2011-11-02 13:06:18 +0100 | [diff] [blame] | 3517 | int in_addr2gsna(struct ul16_t *gsna, struct in_addr *src) |
| 3518 | { |
| 3519 | memset(gsna, 0, sizeof(struct ul16_t)); |
| 3520 | gsna->l = 4; |
| 3521 | memcpy(gsna->v, src, gsna->l); |
| 3522 | return 0; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 3523 | } |
Harald Welte | b10ee08 | 2017-08-12 19:29:16 +0200 | [diff] [blame] | 3524 | |
| 3525 | /* TS 29.060 has yet again a different encoding for IMSIs than |
| 3526 | * what we have in other places, so we cannot use the gsm48 |
| 3527 | * decoding functions. Also, libgtp uses an uint64_t in |
| 3528 | * _network byte order_ to contain BCD digits ?!? */ |
| 3529 | const char *imsi_gtp2str(const uint64_t *imsi) |
| 3530 | { |
Harald Welte | a06120d | 2017-11-06 03:12:54 +0900 | [diff] [blame] | 3531 | static char buf[sizeof(*imsi)*2+1]; |
Harald Welte | b10ee08 | 2017-08-12 19:29:16 +0200 | [diff] [blame] | 3532 | const uint8_t *imsi8 = (const uint8_t *) imsi; |
| 3533 | unsigned int i, j = 0; |
| 3534 | |
| 3535 | for (i = 0; i < sizeof(*imsi); i++) { |
| 3536 | uint8_t nibble; |
| 3537 | |
| 3538 | nibble = imsi8[i] & 0xf; |
| 3539 | if (nibble == 0xf) |
| 3540 | break; |
| 3541 | buf[j++] = osmo_bcd2char(nibble); |
| 3542 | |
| 3543 | nibble = imsi8[i] >> 4; |
| 3544 | if (nibble == 0xf) |
| 3545 | break; |
| 3546 | buf[j++] = osmo_bcd2char(nibble); |
| 3547 | } |
| 3548 | |
| 3549 | buf[j++] = '\0'; |
| 3550 | return buf; |
| 3551 | } |
Keith | cbc07bd | 2020-10-10 12:17:26 +0200 | [diff] [blame] | 3552 | |
Keith | fb2a729 | 2020-10-12 15:32:07 +0200 | [diff] [blame] | 3553 | /* Generate the GTP IMSI IE according to 09.60 Section 7.9.2 */ |
| 3554 | uint64_t gtp_imsi_str2gtp(const char *str) |
Keith | cbc07bd | 2020-10-10 12:17:26 +0200 | [diff] [blame] | 3555 | { |
Keith | fb2a729 | 2020-10-12 15:32:07 +0200 | [diff] [blame] | 3556 | uint64_t imsi64 = 0; |
| 3557 | unsigned int n; |
| 3558 | unsigned int imsi_len = strlen(str); |
Keith | cbc07bd | 2020-10-10 12:17:26 +0200 | [diff] [blame] | 3559 | |
Keith | fb2a729 | 2020-10-12 15:32:07 +0200 | [diff] [blame] | 3560 | if (imsi_len > 16) { |
| 3561 | LOGP(DLGTP, LOGL_NOTICE, "IMSI length > 16 not supported!\n"); |
| 3562 | return 0; |
| 3563 | } |
| 3564 | |
| 3565 | for (n = 0; n < 16; n++) { |
| 3566 | uint64_t val; |
| 3567 | if (n < imsi_len) |
| 3568 | val = (str[n]-'0') & 0xf; |
| 3569 | else |
| 3570 | val = 0xf; |
| 3571 | imsi64 |= (val << (n*4)); |
| 3572 | } |
| 3573 | return imsi64; |
| 3574 | } |