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