Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1 | /*! \file gprs_ns2.c |
| 2 | * GPRS Networks Service (NS) messages on the Gb interface. |
| 3 | * 3GPP TS 08.16 version 8.0.1 Release 1999 / ETSI TS 101 299 V8.0.1 (2002-05) |
| 4 | * as well as its successor 3GPP TS 48.016 */ |
| 5 | |
| 6 | /* (C) 2009-2018 by Harald Welte <laforge@gnumonks.org> |
| 7 | * (C) 2016-2017,2020 sysmocom - s.f.m.c. GmbH |
| 8 | * Author: Alexander Couzens <lynxis@fe80.eu> |
| 9 | * |
| 10 | * |
| 11 | * All Rights Reserved |
| 12 | * |
| 13 | * SPDX-License-Identifier: GPL-2.0+ |
| 14 | * |
| 15 | * This program is free software; you can redistribute it and/or modify |
| 16 | * it under the terms of the GNU General Public License as published by |
| 17 | * the Free Software Foundation; either version 2 of the License, or |
| 18 | * (at your option) any later version. |
| 19 | * |
| 20 | * This program is distributed in the hope that it will be useful, |
| 21 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 22 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 23 | * GNU General Public License for more details. |
| 24 | * |
| 25 | * You should have received a copy of the GNU General Public License |
| 26 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 27 | * |
| 28 | */ |
| 29 | |
| 30 | /*! \addtogroup libgb |
| 31 | * @{ |
| 32 | * |
| 33 | * GPRS Networks Service (NS) messages on the Gb interface |
| 34 | * 3GPP TS 08.16 version 8.0.1 Release 1999 / ETSI TS 101 299 V8.0.1 (2002-05) |
| 35 | * |
| 36 | * Some introduction into NS: NS is used typically on top of frame relay, |
| 37 | * but in the ip.access world it is encapsulated in UDP packets. It serves |
| 38 | * as an intermediate shim betwen BSSGP and the underlying medium. It doesn't |
| 39 | * do much, apart from providing congestion notification and status indication. |
| 40 | * |
| 41 | * Terms: |
| 42 | * |
| 43 | * NS Network Service |
| 44 | * NSVC NS Virtual Connection |
| 45 | * NSEI NS Entity Identifier |
| 46 | * NSVL NS Virtual Link |
| 47 | * NSVLI NS Virtual Link Identifier |
| 48 | * BVC BSSGP Virtual Connection |
| 49 | * BVCI BSSGP Virtual Connection Identifier |
| 50 | * NSVCG NS Virtual Connection Goup |
| 51 | * Blocked NS-VC cannot be used for user traffic |
| 52 | * Alive Ability of a NS-VC to provide communication |
| 53 | * |
| 54 | * There can be multiple BSSGP virtual connections over one (group of) NSVC's. BSSGP will |
| 55 | * therefore identify the BSSGP virtual connection by a BVCI passed down to NS. |
| 56 | * NS then has to figure out which NSVC's are responsible for this BVCI. |
| 57 | * Those mappings are administratively configured. |
| 58 | * |
| 59 | * This implementation has the following limitations: |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 60 | * - NSVCI 65535 and 65534 are reserved for internal use |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 61 | * - There are no BLOCK and UNBLOCK timers (yet?) |
| 62 | * |
| 63 | * \file gprs_ns2.c */ |
| 64 | |
| 65 | #include <stdlib.h> |
| 66 | #include <unistd.h> |
| 67 | #include <errno.h> |
| 68 | #include <stdint.h> |
| 69 | |
| 70 | #include <sys/types.h> |
| 71 | #include <sys/socket.h> |
| 72 | #include <arpa/inet.h> |
| 73 | |
| 74 | #include <osmocom/core/fsm.h> |
Daniel Willmann | 751977b | 2020-12-02 18:59:44 +0100 | [diff] [blame] | 75 | #include <osmocom/core/logging.h> |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 76 | #include <osmocom/core/msgb.h> |
| 77 | #include <osmocom/core/rate_ctr.h> |
| 78 | #include <osmocom/core/socket.h> |
| 79 | #include <osmocom/core/sockaddr_str.h> |
| 80 | #include <osmocom/core/stats.h> |
| 81 | #include <osmocom/core/stat_item.h> |
| 82 | #include <osmocom/core/talloc.h> |
| 83 | #include <osmocom/gprs/gprs_msgb.h> |
| 84 | #include <osmocom/gsm/prim.h> |
| 85 | #include <osmocom/gsm/tlv.h> |
| 86 | |
| 87 | #include "gprs_ns2_internal.h" |
| 88 | |
| 89 | #define ns_set_state(ns_, st_) ns_set_state_with_log(ns_, st_, false, __FILE__, __LINE__) |
| 90 | #define ns_set_remote_state(ns_, st_) ns_set_state_with_log(ns_, st_, true, __FILE__, __LINE__) |
| 91 | #define ns_mark_blocked(ns_) ns_set_state(ns_, (ns_)->state | NSE_S_BLOCKED) |
| 92 | #define ns_mark_unblocked(ns_) ns_set_state(ns_, (ns_)->state & (~NSE_S_BLOCKED)); |
| 93 | #define ns_mark_alive(ns_) ns_set_state(ns_, (ns_)->state | NSE_S_ALIVE) |
| 94 | #define ns_mark_dead(ns_) ns_set_state(ns_, (ns_)->state & (~NSE_S_ALIVE)); |
| 95 | |
| 96 | /* HACK: The NS_IE_IP_ADDR does not follow any known TLV rules. |
| 97 | * Since it's a hard ABI break to implement 16 bit tag with fixed length entries to workaround it, |
| 98 | * the parser will be called with ns_att_tlvdef1 and if it's failed with ns_att_tlvdef2. |
| 99 | * The TLV parser depends on 8bit tag in many places. |
| 100 | * The NS_IE_IP_ADDR is only valid for SNS_ACK SNS_ADD and SNS_DELETE. |
| 101 | */ |
| 102 | static const struct tlv_definition ns_att_tlvdef1 = { |
| 103 | .def = { |
| 104 | [NS_IE_CAUSE] = { TLV_TYPE_TvLV, 0 }, |
| 105 | [NS_IE_VCI] = { TLV_TYPE_TvLV, 0 }, |
| 106 | [NS_IE_PDU] = { TLV_TYPE_TvLV, 0 }, |
| 107 | [NS_IE_BVCI] = { TLV_TYPE_TvLV, 0 }, |
| 108 | [NS_IE_NSEI] = { TLV_TYPE_TvLV, 0 }, |
| 109 | [NS_IE_IPv4_LIST] = { TLV_TYPE_TvLV, 0 }, |
| 110 | [NS_IE_IPv6_LIST] = { TLV_TYPE_TvLV, 0 }, |
| 111 | [NS_IE_MAX_NR_NSVC] = { TLV_TYPE_FIXED, 2 }, |
| 112 | [NS_IE_IPv4_EP_NR] = { TLV_TYPE_FIXED, 2 }, |
| 113 | [NS_IE_IPv6_EP_NR] = { TLV_TYPE_FIXED, 2 }, |
| 114 | [NS_IE_RESET_FLAG] = { TLV_TYPE_TV, 0 }, |
| 115 | /* NS_IE_IP_ADDR in the IPv4 version */ |
| 116 | [NS_IE_IP_ADDR] = { TLV_TYPE_FIXED, 5 }, |
| 117 | }, |
| 118 | }; |
| 119 | |
| 120 | static const struct tlv_definition ns_att_tlvdef2 = { |
| 121 | .def = { |
| 122 | [NS_IE_CAUSE] = { TLV_TYPE_TvLV, 0 }, |
| 123 | [NS_IE_VCI] = { TLV_TYPE_TvLV, 0 }, |
| 124 | [NS_IE_PDU] = { TLV_TYPE_TvLV, 0 }, |
| 125 | [NS_IE_BVCI] = { TLV_TYPE_TvLV, 0 }, |
| 126 | [NS_IE_NSEI] = { TLV_TYPE_TvLV, 0 }, |
| 127 | [NS_IE_IPv4_LIST] = { TLV_TYPE_TvLV, 0 }, |
| 128 | [NS_IE_IPv6_LIST] = { TLV_TYPE_TvLV, 0 }, |
| 129 | [NS_IE_MAX_NR_NSVC] = { TLV_TYPE_FIXED, 2 }, |
| 130 | [NS_IE_IPv4_EP_NR] = { TLV_TYPE_FIXED, 2 }, |
| 131 | [NS_IE_IPv6_EP_NR] = { TLV_TYPE_FIXED, 2 }, |
| 132 | [NS_IE_RESET_FLAG] = { TLV_TYPE_TV, 0 }, |
| 133 | /* NS_IE_IP_ADDR in the IPv6 version */ |
| 134 | [NS_IE_IP_ADDR] = { TLV_TYPE_FIXED, 17 }, |
| 135 | }, |
| 136 | }; |
| 137 | |
| 138 | |
| 139 | /* Section 10.3.2, Table 13 */ |
Alexander Couzens | b3b837c | 2020-10-27 15:12:25 +0100 | [diff] [blame] | 140 | const struct value_string gprs_ns2_cause_strs[] = { |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 141 | { NS_CAUSE_TRANSIT_FAIL, "Transit network failure" }, |
| 142 | { NS_CAUSE_OM_INTERVENTION, "O&M intervention" }, |
| 143 | { NS_CAUSE_EQUIP_FAIL, "Equipment failure" }, |
| 144 | { NS_CAUSE_NSVC_BLOCKED, "NS-VC blocked" }, |
| 145 | { NS_CAUSE_NSVC_UNKNOWN, "NS-VC unknown" }, |
| 146 | { NS_CAUSE_BVCI_UNKNOWN, "BVCI unknown" }, |
| 147 | { NS_CAUSE_SEM_INCORR_PDU, "Semantically incorrect PDU" }, |
| 148 | { NS_CAUSE_PDU_INCOMP_PSTATE, "PDU not compatible with protocol state" }, |
| 149 | { NS_CAUSE_PROTO_ERR_UNSPEC, "Protocol error, unspecified" }, |
| 150 | { NS_CAUSE_INVAL_ESSENT_IE, "Invalid essential IE" }, |
| 151 | { NS_CAUSE_MISSING_ESSENT_IE, "Missing essential IE" }, |
| 152 | { NS_CAUSE_INVAL_NR_IPv4_EP, "Invalid Number of IPv4 Endpoints" }, |
| 153 | { NS_CAUSE_INVAL_NR_IPv6_EP, "Invalid Number of IPv6 Endpoints" }, |
| 154 | { NS_CAUSE_INVAL_NR_NS_VC, "Invalid Number of NS-VCs" }, |
| 155 | { NS_CAUSE_INVAL_WEIGH, "Invalid Weights" }, |
| 156 | { NS_CAUSE_UNKN_IP_EP, "Unknown IP Endpoint" }, |
| 157 | { NS_CAUSE_UNKN_IP_ADDR, "Unknown IP Address" }, |
| 158 | { NS_CAUSE_UNKN_IP_TEST_FAILED, "IP Test Failed" }, |
| 159 | { 0, NULL } |
| 160 | }; |
| 161 | |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 162 | static const struct rate_ctr_desc nsvc_ctr_description[] = { |
Harald Welte | 3d5eaee | 2021-01-30 21:33:02 +0100 | [diff] [blame] | 163 | [NS_CTR_PKTS_IN] = { "packets:in", "Packets at NS Level ( In)" }, |
| 164 | [NS_CTR_PKTS_OUT] = { "packets:out", "Packets at NS Level (Out)" }, |
Harald Welte | f22ae5a | 2021-01-30 22:01:28 +0100 | [diff] [blame] | 165 | [NS_CTR_PKTS_OUT_DROP] = { "packets:out:drop", "Dropped Packets (Out)" }, |
Harald Welte | 3d5eaee | 2021-01-30 21:33:02 +0100 | [diff] [blame] | 166 | [NS_CTR_BYTES_IN] = { "bytes:in", "Bytes at NS Level ( In)" }, |
| 167 | [NS_CTR_BYTES_OUT] = { "bytes:out", "Bytes at NS Level (Out)" }, |
Harald Welte | f22ae5a | 2021-01-30 22:01:28 +0100 | [diff] [blame] | 168 | [NS_CTR_BYTES_OUT_DROP] = { "bytes:out:drop", "Dropped Bytes (Out)" }, |
Harald Welte | 3d5eaee | 2021-01-30 21:33:02 +0100 | [diff] [blame] | 169 | [NS_CTR_BLOCKED] = { "blocked", "NS-VC Block count " }, |
Harald Welte | b40bf8b | 2021-01-30 22:43:01 +0100 | [diff] [blame] | 170 | [NS_CTR_UNBLOCKED] = { "unblocked", "NS-VC Unblock count " }, |
Harald Welte | 3d5eaee | 2021-01-30 21:33:02 +0100 | [diff] [blame] | 171 | [NS_CTR_DEAD] = { "dead", "NS-VC gone dead count " }, |
| 172 | [NS_CTR_REPLACED] = { "replaced", "NS-VC replaced other count" }, |
| 173 | [NS_CTR_NSEI_CHG] = { "nsei-chg", "NS-VC changed NSEI count " }, |
| 174 | [NS_CTR_INV_VCI] = { "inv-nsvci", "NS-VCI was invalid count " }, |
| 175 | [NS_CTR_INV_NSEI] = { "inv-nsei", "NSEI was invalid count " }, |
| 176 | [NS_CTR_LOST_ALIVE] = { "lost:alive", "ALIVE ACK missing count " }, |
| 177 | [NS_CTR_LOST_RESET] = { "lost:reset", "RESET ACK missing count " }, |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 178 | }; |
| 179 | |
| 180 | static const struct rate_ctr_group_desc nsvc_ctrg_desc = { |
| 181 | .group_name_prefix = "ns:nsvc", |
| 182 | .group_description = "NSVC Peer Statistics", |
| 183 | .num_ctr = ARRAY_SIZE(nsvc_ctr_description), |
| 184 | .ctr_desc = nsvc_ctr_description, |
| 185 | .class_id = OSMO_STATS_CLASS_PEER, |
| 186 | }; |
| 187 | |
| 188 | |
| 189 | static const struct osmo_stat_item_desc nsvc_stat_description[] = { |
Harald Welte | 3d5eaee | 2021-01-30 21:33:02 +0100 | [diff] [blame] | 190 | [NS_STAT_ALIVE_DELAY] = { "alive.delay", "ALIVE response time ", "ms", 16, 0 }, |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 191 | }; |
| 192 | |
| 193 | static const struct osmo_stat_item_group_desc nsvc_statg_desc = { |
| 194 | .group_name_prefix = "ns.nsvc", |
| 195 | .group_description = "NSVC Peer Statistics", |
| 196 | .num_items = ARRAY_SIZE(nsvc_stat_description), |
| 197 | .item_desc = nsvc_stat_description, |
| 198 | .class_id = OSMO_STATS_CLASS_PEER, |
| 199 | }; |
| 200 | |
Harald Welte | 7634607 | 2021-01-31 11:54:02 +0100 | [diff] [blame] | 201 | const struct osmo_stat_item_desc nsbind_stat_description[] = { |
| 202 | [NS2_BIND_STAT_BACKLOG_LEN] = { "tx_backlog_length", "Transmit backlog length", "packets", 16, 0 }, |
| 203 | }; |
| 204 | |
| 205 | static const struct osmo_stat_item_group_desc nsbind_statg_desc = { |
| 206 | .group_name_prefix = "ns.bind", |
| 207 | .group_description = "NS Bind Statistics", |
| 208 | .num_items = ARRAY_SIZE(nsbind_stat_description), |
| 209 | .item_desc = nsbind_stat_description, |
| 210 | .class_id = OSMO_STATS_CLASS_PEER, |
| 211 | }; |
| 212 | |
Alexander Couzens | 2498f1d | 2020-10-27 01:09:01 +0100 | [diff] [blame] | 213 | const struct value_string gprs_ns2_aff_cause_prim_strs[] = { |
Alexander Couzens | 138b96f | 2021-01-25 16:23:29 +0100 | [diff] [blame] | 214 | { GPRS_NS2_AFF_CAUSE_VC_FAILURE, "NSVC failure" }, |
| 215 | { GPRS_NS2_AFF_CAUSE_VC_RECOVERY, "NSVC recovery" }, |
| 216 | { GPRS_NS2_AFF_CAUSE_FAILURE, "NSE failure" }, |
| 217 | { GPRS_NS2_AFF_CAUSE_RECOVERY, "NSE recovery" }, |
| 218 | { GPRS_NS2_AFF_CAUSE_SNS_CONFIGURED, "NSE SNS configured" }, |
| 219 | { GPRS_NS2_AFF_CAUSE_SNS_FAILURE, "NSE SNS failure" }, |
Alexander Couzens | 4f1128f | 2021-01-20 17:42:48 +0100 | [diff] [blame^] | 220 | { GPRS_NS2_AFF_CAUSE_MTU_CHANGE, "NSE MTU changed" }, |
Alexander Couzens | 2498f1d | 2020-10-27 01:09:01 +0100 | [diff] [blame] | 221 | { 0, NULL } |
| 222 | }; |
| 223 | |
Alexander Couzens | 0ab028c | 2020-11-04 02:41:44 +0100 | [diff] [blame] | 224 | const struct value_string gprs_ns2_prim_strs[] = { |
Alexander Couzens | 138b96f | 2021-01-25 16:23:29 +0100 | [diff] [blame] | 225 | { GPRS_NS2_PRIM_UNIT_DATA, "UNIT DATA" }, |
| 226 | { GPRS_NS2_PRIM_CONGESTION, "CONGESTION" }, |
| 227 | { GPRS_NS2_PRIM_STATUS, "STATUS" }, |
Alexander Couzens | 2498f1d | 2020-10-27 01:09:01 +0100 | [diff] [blame] | 228 | { 0, NULL } |
| 229 | }; |
| 230 | |
Harald Welte | a24e7ee | 2020-11-29 17:38:48 +0100 | [diff] [blame] | 231 | const struct value_string gprs_ns2_lltype_strs[] = { |
| 232 | { GPRS_NS2_LL_UDP, "UDP" }, |
| 233 | { GPRS_NS2_LL_FR_GRE, "FR_GRE" }, |
| 234 | { GPRS_NS2_LL_FR, "FR" }, |
| 235 | { 0, NULL } |
| 236 | }; |
| 237 | |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 238 | /*! string-format a given NS-VC into a user-supplied buffer. |
| 239 | * \param[in] buf user-allocated output buffer |
| 240 | * \param[in] buf_len size of user-allocated output buffer in bytes |
| 241 | * \param[in] nsvc NS-VC to be string-formatted |
| 242 | * \return pointer to buf on success; NULL on error */ |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 243 | char *gprs_ns2_ll_str_buf(char *buf, size_t buf_len, struct gprs_ns2_vc *nsvc) |
| 244 | { |
Alexander Couzens | 9a4cf27 | 2020-10-11 20:48:04 +0200 | [diff] [blame] | 245 | const struct osmo_sockaddr *local; |
| 246 | const struct osmo_sockaddr *remote; |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 247 | struct osmo_sockaddr_str local_str; |
| 248 | struct osmo_sockaddr_str remote_str; |
| 249 | |
| 250 | if (!buf_len) |
Harald Welte | 92ad029 | 2020-09-18 22:34:24 +0200 | [diff] [blame] | 251 | return NULL; |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 252 | |
Alexander Couzens | aac9016 | 2020-11-19 02:44:04 +0100 | [diff] [blame] | 253 | switch (nsvc->nse->ll) { |
Alexander Couzens | 24a14ac | 2020-11-19 02:34:49 +0100 | [diff] [blame] | 254 | case GPRS_NS2_LL_UDP: |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 255 | if (!gprs_ns2_is_ip_bind(nsvc->bind)) { |
| 256 | buf[0] = '\0'; |
| 257 | return buf; |
| 258 | } |
| 259 | |
| 260 | local = gprs_ns2_ip_bind_sockaddr(nsvc->bind); |
Alexander Couzens | c4229a4 | 2020-10-11 20:58:04 +0200 | [diff] [blame] | 261 | remote = gprs_ns2_ip_vc_remote(nsvc); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 262 | if (osmo_sockaddr_str_from_sockaddr(&local_str, &local->u.sas)) |
| 263 | strcpy(local_str.ip, "invalid"); |
| 264 | if (osmo_sockaddr_str_from_sockaddr(&remote_str, &remote->u.sas)) |
| 265 | strcpy(remote_str.ip, "invalid"); |
| 266 | |
| 267 | if (nsvc->nsvci_is_valid) |
| 268 | snprintf(buf, buf_len, "udp)[%s]:%u<%u>[%s]:%u", |
| 269 | local_str.ip, local_str.port, |
| 270 | nsvc->nsvci, |
| 271 | remote_str.ip, remote_str.port); |
| 272 | else |
| 273 | snprintf(buf, buf_len, "udp)[%s]:%u<>[%s]:%u", |
| 274 | local_str.ip, local_str.port, |
| 275 | remote_str.ip, remote_str.port); |
| 276 | break; |
Alexander Couzens | 24a14ac | 2020-11-19 02:34:49 +0100 | [diff] [blame] | 277 | case GPRS_NS2_LL_FR_GRE: |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 278 | snprintf(buf, buf_len, "frgre)"); |
| 279 | break; |
Alexander Couzens | 24a14ac | 2020-11-19 02:34:49 +0100 | [diff] [blame] | 280 | case GPRS_NS2_LL_FR: |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 281 | snprintf(buf, buf_len, "fr)netif: %s dlci: %u", gprs_ns2_fr_bind_netif(nsvc->bind), |
| 282 | gprs_ns2_fr_nsvc_dlci(nsvc)); |
| 283 | break; |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 284 | default: |
Harald Welte | 6188e00 | 2020-12-01 17:20:07 +0100 | [diff] [blame] | 285 | snprintf(buf, buf_len, "unknown)"); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 286 | break; |
| 287 | } |
| 288 | |
| 289 | buf[buf_len - 1] = '\0'; |
| 290 | |
| 291 | return buf; |
| 292 | } |
| 293 | |
| 294 | /* udp is the longest: udp)[IP6]:65536<65536>[IP6]:65536 */ |
| 295 | #define NS2_LL_MAX_STR 4+2*(INET6_ADDRSTRLEN+9)+8 |
| 296 | |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 297 | /*! string-format a given NS-VC to a thread-local static buffer. |
| 298 | * \param[in] nsvc NS-VC to be string-formatted |
| 299 | * \return pointer to the string on success; NULL on error */ |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 300 | const char *gprs_ns2_ll_str(struct gprs_ns2_vc *nsvc) |
| 301 | { |
| 302 | static __thread char buf[NS2_LL_MAX_STR]; |
| 303 | return gprs_ns2_ll_str_buf(buf, sizeof(buf), nsvc); |
| 304 | } |
| 305 | |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 306 | /*! string-format a given NS-VC to a dynamically allocated string. |
| 307 | * \param[in] ctx talloc context from which to allocate |
| 308 | * \param[in] nsvc NS-VC to be string-formatted |
| 309 | * \return pointer to the string on success; NULL on error */ |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 310 | char *gprs_ns2_ll_str_c(const void *ctx, struct gprs_ns2_vc *nsvc) |
| 311 | { |
| 312 | char *buf = talloc_size(ctx, NS2_LL_MAX_STR); |
| 313 | if (!buf) |
| 314 | return buf; |
| 315 | return gprs_ns2_ll_str_buf(buf, NS2_LL_MAX_STR, nsvc); |
| 316 | } |
| 317 | |
Daniel Willmann | f128654 | 2020-11-03 23:03:33 +0100 | [diff] [blame] | 318 | /*! Return the current state name of a given NS-VC to a thread-local static buffer. |
| 319 | * \param[in] nsvc NS-VC to return the state of |
| 320 | * \return pointer to the string on success; NULL on error */ |
| 321 | const char *gprs_ns2_nsvc_state_name(struct gprs_ns2_vc *nsvc) |
| 322 | { |
| 323 | return osmo_fsm_inst_state_name(nsvc->fi); |
| 324 | } |
| 325 | |
Alexander Couzens | fc3dd1f | 2020-11-19 00:41:47 +0100 | [diff] [blame] | 326 | /* select a signalling NSVC and respect sig_counter |
| 327 | * param[out] reset_counter - all counter has to be resetted to their signal weight |
| 328 | * return the chosen nsvc or NULL |
| 329 | */ |
| 330 | static struct gprs_ns2_vc *ns2_load_sharing_signal(struct gprs_ns2_nse *nse) |
| 331 | { |
| 332 | struct gprs_ns2_vc *nsvc = NULL, *last = NULL, *tmp; |
| 333 | |
| 334 | llist_for_each_entry(tmp, &nse->nsvc, list) { |
| 335 | if (tmp->sig_weight == 0) |
| 336 | continue; |
Alexander Couzens | 8dfc24c | 2021-01-25 16:09:23 +0100 | [diff] [blame] | 337 | if (!ns2_vc_is_unblocked(tmp)) |
Alexander Couzens | fc3dd1f | 2020-11-19 00:41:47 +0100 | [diff] [blame] | 338 | continue; |
| 339 | if (tmp->sig_counter == 0) { |
| 340 | last = tmp; |
| 341 | continue; |
| 342 | } |
| 343 | |
| 344 | tmp->sig_counter--; |
| 345 | nsvc = tmp; |
| 346 | break; |
| 347 | } |
| 348 | |
| 349 | /* all counter were zero, but there are valid nsvc */ |
| 350 | if (!nsvc && last) { |
| 351 | llist_for_each_entry(tmp, &nse->nsvc, list) { |
| 352 | tmp->sig_counter = tmp->sig_weight; |
| 353 | } |
| 354 | |
| 355 | last->sig_counter--; |
| 356 | return last; |
| 357 | } else { |
| 358 | return nsvc; |
| 359 | } |
| 360 | } |
| 361 | |
| 362 | /* 4.4.1 Load Sharing function for the Frame Relay Sub-Network */ |
| 363 | static struct gprs_ns2_vc *ns2_load_sharing_modulor( |
| 364 | struct gprs_ns2_nse *nse, |
| 365 | uint16_t bvci, |
| 366 | uint32_t load_selector) |
| 367 | { |
| 368 | struct gprs_ns2_vc *tmp; |
Alexander Couzens | 265a5eb | 2021-02-02 11:26:17 +0100 | [diff] [blame] | 369 | uint32_t mod; |
Alexander Couzens | fc3dd1f | 2020-11-19 00:41:47 +0100 | [diff] [blame] | 370 | uint32_t i = 0; |
| 371 | |
Alexander Couzens | 265a5eb | 2021-02-02 11:26:17 +0100 | [diff] [blame] | 372 | if (nse->nsvc_count == 0) |
| 373 | return NULL; |
| 374 | |
| 375 | mod = (bvci + load_selector) % nse->nsvc_count; |
Alexander Couzens | fc3dd1f | 2020-11-19 00:41:47 +0100 | [diff] [blame] | 376 | llist_for_each_entry(tmp, &nse->nsvc, list) { |
Alexander Couzens | 8dfc24c | 2021-01-25 16:09:23 +0100 | [diff] [blame] | 377 | if (!ns2_vc_is_unblocked(tmp)) |
Alexander Couzens | fc3dd1f | 2020-11-19 00:41:47 +0100 | [diff] [blame] | 378 | continue; |
Alexander Couzens | fc3dd1f | 2020-11-19 00:41:47 +0100 | [diff] [blame] | 379 | if (i == mod) |
| 380 | return tmp; |
| 381 | i++; |
| 382 | } |
| 383 | |
| 384 | return NULL; |
| 385 | } |
| 386 | |
| 387 | /* pick the first available data NSVC - no load sharing */ |
| 388 | struct gprs_ns2_vc *ns2_load_sharing_first(struct gprs_ns2_nse *nse) |
| 389 | { |
| 390 | struct gprs_ns2_vc *nsvc = NULL, *tmp; |
| 391 | |
| 392 | llist_for_each_entry(tmp, &nse->nsvc, list) { |
Alexander Couzens | 8dfc24c | 2021-01-25 16:09:23 +0100 | [diff] [blame] | 393 | if (!ns2_vc_is_unblocked(tmp)) |
Alexander Couzens | fc3dd1f | 2020-11-19 00:41:47 +0100 | [diff] [blame] | 394 | continue; |
| 395 | if (tmp->data_weight == 0) |
| 396 | continue; |
| 397 | |
| 398 | nsvc = tmp; |
| 399 | break; |
| 400 | } |
| 401 | |
| 402 | return nsvc; |
| 403 | } |
| 404 | |
| 405 | |
| 406 | static struct gprs_ns2_vc *ns2_load_sharing( |
| 407 | struct gprs_ns2_nse *nse, |
| 408 | uint16_t bvci, |
| 409 | uint32_t link_selector) |
| 410 | { |
| 411 | struct gprs_ns2_vc *nsvc = NULL; |
| 412 | |
Alexander Couzens | 8a2a1a4 | 2020-12-26 18:00:17 +0100 | [diff] [blame] | 413 | switch (nse->ll) { |
| 414 | case GPRS_NS2_LL_FR: |
| 415 | nsvc = ns2_load_sharing_modulor(nse, bvci, link_selector); |
| 416 | break; |
| 417 | case GPRS_NS2_LL_UDP: |
| 418 | default: |
| 419 | if (bvci == 0) { |
| 420 | /* signalling */ |
| 421 | nsvc = ns2_load_sharing_signal(nse); |
| 422 | } else { |
| 423 | /* data with load sharing parameter */ |
Alexander Couzens | fc3dd1f | 2020-11-19 00:41:47 +0100 | [diff] [blame] | 424 | nsvc = ns2_load_sharing_first(nse); |
Alexander Couzens | fc3dd1f | 2020-11-19 00:41:47 +0100 | [diff] [blame] | 425 | } |
Alexander Couzens | 8a2a1a4 | 2020-12-26 18:00:17 +0100 | [diff] [blame] | 426 | break; |
Alexander Couzens | fc3dd1f | 2020-11-19 00:41:47 +0100 | [diff] [blame] | 427 | } |
| 428 | |
| 429 | return nsvc; |
| 430 | } |
| 431 | |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 432 | /*! Receive a primitive from the NS User (Gb). |
| 433 | * \param[in] nsi NS instance to which the primitive is issued |
| 434 | * \param[in] oph The primitive |
| 435 | * \return 0 on success; negative on error */ |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 436 | int gprs_ns2_recv_prim(struct gprs_ns2_inst *nsi, struct osmo_prim_hdr *oph) |
| 437 | { |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 438 | /* TODO: implement resource distribution */ |
| 439 | /* TODO: check for empty PDUs which can be sent to Request/Confirm |
| 440 | * the IP endpoint */ |
| 441 | struct osmo_gprs_ns2_prim *nsp; |
| 442 | struct gprs_ns2_nse *nse = NULL; |
Alexander Couzens | fc3dd1f | 2020-11-19 00:41:47 +0100 | [diff] [blame] | 443 | struct gprs_ns2_vc *nsvc = NULL; |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 444 | uint16_t bvci, nsei; |
| 445 | uint8_t sducontrol = 0; |
| 446 | |
| 447 | if (oph->sap != SAP_NS) |
| 448 | return -EINVAL; |
| 449 | |
| 450 | nsp = container_of(oph, struct osmo_gprs_ns2_prim, oph); |
| 451 | |
Alexander Couzens | 138b96f | 2021-01-25 16:23:29 +0100 | [diff] [blame] | 452 | if (oph->operation != PRIM_OP_REQUEST || oph->primitive != GPRS_NS2_PRIM_UNIT_DATA) |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 453 | return -EINVAL; |
| 454 | |
| 455 | if (!oph->msg) |
| 456 | return -EINVAL; |
| 457 | |
| 458 | bvci = nsp->bvci; |
| 459 | nsei = nsp->nsei; |
| 460 | |
| 461 | nse = gprs_ns2_nse_by_nsei(nsi, nsei); |
| 462 | if (!nse) |
| 463 | return -EINVAL; |
| 464 | |
Alexander Couzens | 265a5eb | 2021-02-02 11:26:17 +0100 | [diff] [blame] | 465 | if (!nse->alive) |
| 466 | return 0; |
| 467 | |
Alexander Couzens | fc3dd1f | 2020-11-19 00:41:47 +0100 | [diff] [blame] | 468 | nsvc = ns2_load_sharing(nse, bvci, nsp->u.unitdata.link_selector); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 469 | |
| 470 | /* TODO: send a status primitive back */ |
| 471 | if (!nsvc) |
| 472 | return 0; |
| 473 | |
Alexander Couzens | 138b96f | 2021-01-25 16:23:29 +0100 | [diff] [blame] | 474 | if (nsp->u.unitdata.change == GPRS_NS2_ENDPOINT_REQUEST_CHANGE) |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 475 | sducontrol = 1; |
Alexander Couzens | 138b96f | 2021-01-25 16:23:29 +0100 | [diff] [blame] | 476 | else if (nsp->u.unitdata.change == GPRS_NS2_ENDPOINT_CONFIRM_CHANGE) |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 477 | sducontrol = 2; |
| 478 | |
| 479 | return ns2_tx_unit_data(nsvc, bvci, sducontrol, oph->msg); |
| 480 | } |
| 481 | |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 482 | /*! Send a STATUS.ind primitive to the specified NS instance user. |
| 483 | * \param[in] nsi NS instance on which we operate |
| 484 | * \param[in] nsei NSEI to which the statue relates |
| 485 | * \param[in] bvci BVCI to which the status relates |
| 486 | * \param[in] cause The cause of the status */ |
Alexander Couzens | bf95f0f | 2020-10-01 22:56:03 +0200 | [diff] [blame] | 487 | void ns2_prim_status_ind(struct gprs_ns2_nse *nse, |
Daniel Willmann | 15c09a8 | 2020-11-03 23:05:43 +0100 | [diff] [blame] | 488 | struct gprs_ns2_vc *nsvc, |
Alexander Couzens | bf95f0f | 2020-10-01 22:56:03 +0200 | [diff] [blame] | 489 | uint16_t bvci, |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 490 | enum gprs_ns2_affecting_cause cause) |
| 491 | { |
Daniel Willmann | 15c09a8 | 2020-11-03 23:05:43 +0100 | [diff] [blame] | 492 | char nsvc_str[NS2_LL_MAX_STR]; |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 493 | struct osmo_gprs_ns2_prim nsp = {}; |
Alexander Couzens | bf95f0f | 2020-10-01 22:56:03 +0200 | [diff] [blame] | 494 | nsp.nsei = nse->nsei; |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 495 | nsp.bvci = bvci; |
| 496 | nsp.u.status.cause = cause; |
Alexander Couzens | 1c8785d | 2020-12-17 06:58:53 +0100 | [diff] [blame] | 497 | nsp.u.status.transfer = ns2_count_transfer_cap(nse, bvci); |
Alexander Couzens | da0a285 | 2020-10-01 23:24:07 +0200 | [diff] [blame] | 498 | nsp.u.status.first = nse->first; |
| 499 | nsp.u.status.persistent = nse->persistent; |
Alexander Couzens | 4f1128f | 2021-01-20 17:42:48 +0100 | [diff] [blame^] | 500 | if (nse->mtu < 4) |
| 501 | nsp.u.status.mtu = 0; |
| 502 | else |
| 503 | nsp.u.status.mtu = nse->mtu - 4; /* 1 Byte NS PDU type, 1 Byte NS SDU control, 2 Byte BVCI */ |
| 504 | |
Harald Welte | 8669043 | 2021-01-31 16:09:19 +0100 | [diff] [blame] | 505 | if (nsvc) { |
Daniel Willmann | 15c09a8 | 2020-11-03 23:05:43 +0100 | [diff] [blame] | 506 | nsp.u.status.nsvc = gprs_ns2_ll_str_buf(nsvc_str, sizeof(nsvc_str), nsvc); |
Alexander Couzens | 4f1128f | 2021-01-20 17:42:48 +0100 | [diff] [blame^] | 507 | LOGNSVC(nsvc, LOGL_NOTICE, "NS-STATUS.ind(bvci=%05u): cause=%s, transfer=%d, first=%d, mtu=%d\n", |
Harald Welte | 8669043 | 2021-01-31 16:09:19 +0100 | [diff] [blame] | 508 | nsp.bvci, gprs_ns2_aff_cause_prim_str(nsp.u.status.cause), |
Alexander Couzens | 4f1128f | 2021-01-20 17:42:48 +0100 | [diff] [blame^] | 509 | nsp.u.status.transfer, nsp.u.status.first, nse->mtu); |
Harald Welte | 8669043 | 2021-01-31 16:09:19 +0100 | [diff] [blame] | 510 | } else { |
Alexander Couzens | 4f1128f | 2021-01-20 17:42:48 +0100 | [diff] [blame^] | 511 | LOGNSE(nse, LOGL_NOTICE, "NS-STATUS.ind(bvci=%05u): cause=%s, transfer=%d, first=%d, mtu=%d\n", |
Harald Welte | 8669043 | 2021-01-31 16:09:19 +0100 | [diff] [blame] | 512 | nsp.bvci, gprs_ns2_aff_cause_prim_str(nsp.u.status.cause), |
Alexander Couzens | 4f1128f | 2021-01-20 17:42:48 +0100 | [diff] [blame^] | 513 | nsp.u.status.transfer, nsp.u.status.first, nse->mtu); |
Harald Welte | 8669043 | 2021-01-31 16:09:19 +0100 | [diff] [blame] | 514 | } |
Daniel Willmann | 15c09a8 | 2020-11-03 23:05:43 +0100 | [diff] [blame] | 515 | |
Harald Welte | 8669043 | 2021-01-31 16:09:19 +0100 | [diff] [blame] | 516 | osmo_prim_init(&nsp.oph, SAP_NS, GPRS_NS2_PRIM_STATUS, PRIM_OP_INDICATION, NULL); |
Alexander Couzens | bf95f0f | 2020-10-01 22:56:03 +0200 | [diff] [blame] | 517 | nse->nsi->cb(&nsp.oph, nse->nsi->cb_data); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 518 | } |
| 519 | |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 520 | /*! Allocate a NS-VC within the given bind + NSE. |
| 521 | * \param[in] bind The 'bind' on which we operate |
| 522 | * \param[in] nse The NS Entity on which we operate |
| 523 | * \param[in] initiater - if this is an incoming remote (!initiater) or a local outgoing connection (initater) |
Harald Welte | 603f404 | 2020-11-29 17:39:19 +0100 | [diff] [blame] | 524 | * \param[in] id - human-readable identifier |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 525 | * \return newly allocated NS-VC on success; NULL on error */ |
Alexander Couzens | d923cff | 2020-12-01 01:03:52 +0100 | [diff] [blame] | 526 | struct gprs_ns2_vc *ns2_vc_alloc(struct gprs_ns2_vc_bind *bind, struct gprs_ns2_nse *nse, bool initiater, |
Harald Welte | 603f404 | 2020-11-29 17:39:19 +0100 | [diff] [blame] | 527 | enum gprs_ns2_vc_mode vc_mode, const char *id) |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 528 | { |
Daniel Willmann | bb89905 | 2021-01-16 14:02:45 +0100 | [diff] [blame] | 529 | /* Sanity check */ |
| 530 | OSMO_ASSERT(bind->ll == nse->ll); |
| 531 | |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 532 | struct gprs_ns2_vc *nsvc = talloc_zero(bind, struct gprs_ns2_vc); |
| 533 | |
| 534 | if (!nsvc) |
| 535 | return NULL; |
| 536 | |
| 537 | nsvc->bind = bind; |
| 538 | nsvc->nse = nse; |
Alexander Couzens | d923cff | 2020-12-01 01:03:52 +0100 | [diff] [blame] | 539 | nsvc->mode = vc_mode; |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 540 | nsvc->sig_weight = 1; |
| 541 | nsvc->data_weight = 1; |
| 542 | |
Harald Welte | 97ccbf7 | 2021-01-31 11:49:19 +0100 | [diff] [blame] | 543 | nsvc->ctrg = rate_ctr_group_alloc(nsvc, &nsvc_ctrg_desc, bind->nsi->nsvc_rate_ctr_idx); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 544 | if (!nsvc->ctrg) { |
| 545 | goto err; |
| 546 | } |
Harald Welte | 97ccbf7 | 2021-01-31 11:49:19 +0100 | [diff] [blame] | 547 | nsvc->statg = osmo_stat_item_group_alloc(nsvc, &nsvc_statg_desc, bind->nsi->nsvc_rate_ctr_idx); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 548 | if (!nsvc->statg) |
| 549 | goto err_group; |
Alexander Couzens | 8dfc24c | 2021-01-25 16:09:23 +0100 | [diff] [blame] | 550 | if (!ns2_vc_fsm_alloc(nsvc, id, initiater)) |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 551 | goto err_statg; |
| 552 | |
Harald Welte | 97ccbf7 | 2021-01-31 11:49:19 +0100 | [diff] [blame] | 553 | bind->nsi->nsvc_rate_ctr_idx++; |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 554 | |
| 555 | llist_add(&nsvc->list, &nse->nsvc); |
| 556 | llist_add(&nsvc->blist, &bind->nsvc); |
Alexander Couzens | 4f1128f | 2021-01-20 17:42:48 +0100 | [diff] [blame^] | 557 | ns2_nse_update_mtu(nse); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 558 | |
| 559 | return nsvc; |
| 560 | |
| 561 | err_statg: |
| 562 | osmo_stat_item_group_free(nsvc->statg); |
| 563 | err_group: |
| 564 | rate_ctr_group_free(nsvc->ctrg); |
| 565 | err: |
| 566 | talloc_free(nsvc); |
| 567 | |
| 568 | return NULL; |
| 569 | } |
| 570 | |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 571 | /*! Destroy/release given NS-VC. |
| 572 | * \param[in] nsvc NS-VC to destroy */ |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 573 | void gprs_ns2_free_nsvc(struct gprs_ns2_vc *nsvc) |
| 574 | { |
| 575 | if (!nsvc) |
| 576 | return; |
| 577 | |
Alexander Couzens | 138b96f | 2021-01-25 16:23:29 +0100 | [diff] [blame] | 578 | ns2_prim_status_ind(nsvc->nse, nsvc, 0, GPRS_NS2_AFF_CAUSE_VC_FAILURE); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 579 | |
| 580 | llist_del(&nsvc->list); |
| 581 | llist_del(&nsvc->blist); |
| 582 | |
| 583 | /* notify nse this nsvc is unavailable */ |
| 584 | ns2_nse_notify_unblocked(nsvc, false); |
| 585 | |
| 586 | /* check if sns is using this VC */ |
Alexander Couzens | be7cecc | 2021-02-03 18:25:27 +0100 | [diff] [blame] | 587 | ns2_sns_replace_nsvc(nsvc); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 588 | osmo_fsm_inst_term(nsvc->fi, OSMO_FSM_TERM_REQUEST, NULL); |
| 589 | |
| 590 | /* let the driver/bind clean up it's internal state */ |
| 591 | if (nsvc->priv && nsvc->bind->free_vc) |
| 592 | nsvc->bind->free_vc(nsvc); |
| 593 | |
| 594 | osmo_stat_item_group_free(nsvc->statg); |
| 595 | rate_ctr_group_free(nsvc->ctrg); |
| 596 | |
| 597 | talloc_free(nsvc); |
| 598 | } |
| 599 | |
Alexander Couzens | 4755879 | 2020-12-06 03:16:11 +0100 | [diff] [blame] | 600 | /*! Destroy/release all NS-VC of given NSE |
| 601 | * \param[in] nse NSE |
| 602 | */ |
| 603 | void gprs_ns2_free_nsvcs(struct gprs_ns2_nse *nse) |
| 604 | { |
| 605 | struct gprs_ns2_vc *nsvc, *tmp; |
| 606 | |
| 607 | if (!nse) |
| 608 | return; |
| 609 | |
| 610 | llist_for_each_entry_safe(nsvc, tmp, &nse->nsvc, list) { |
| 611 | gprs_ns2_free_nsvc(nsvc); |
| 612 | } |
| 613 | } |
| 614 | |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 615 | /*! Allocate a message buffer for use with the NS2 stack. */ |
Alexander Couzens | 8dfc24c | 2021-01-25 16:09:23 +0100 | [diff] [blame] | 616 | struct msgb *ns2_msgb_alloc(void) |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 617 | { |
| 618 | struct msgb *msg = msgb_alloc_headroom(NS_ALLOC_SIZE, NS_ALLOC_HEADROOM, |
| 619 | "GPRS/NS"); |
| 620 | if (!msg) { |
| 621 | LOGP(DLNS, LOGL_ERROR, "Failed to allocate NS message of size %d\n", |
| 622 | NS_ALLOC_SIZE); |
| 623 | } |
| 624 | return msg; |
| 625 | } |
| 626 | |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 627 | /*! Create a status message to be sent over a new connection. |
| 628 | * \param[in] orig_msg the original message |
| 629 | * \param[in] tp TLVP parsed of the original message |
| 630 | * \param[out] reject callee-allocated message buffer of the generated NS-STATUS |
| 631 | * \param[in] cause Cause for the rejection |
| 632 | * \return 0 on success */ |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 633 | static int reject_status_msg(struct msgb *orig_msg, struct tlv_parsed *tp, struct msgb **reject, enum ns_cause cause) |
| 634 | { |
Alexander Couzens | 8dfc24c | 2021-01-25 16:09:23 +0100 | [diff] [blame] | 635 | struct msgb *msg = ns2_msgb_alloc(); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 636 | struct gprs_ns_hdr *nsh; |
| 637 | bool have_vci = false; |
| 638 | uint8_t _cause = cause; |
| 639 | uint16_t nsei = 0; |
| 640 | |
| 641 | if (!msg) |
| 642 | return -ENOMEM; |
| 643 | |
Harald Welte | 798efea | 2020-12-03 16:01:02 +0100 | [diff] [blame] | 644 | if (TLVP_PRES_LEN(tp, NS_IE_NSEI, 2)) { |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 645 | nsei = tlvp_val16be(tp, NS_IE_NSEI); |
| 646 | |
| 647 | LOGP(DLNS, LOGL_NOTICE, "NSEI=%u Rejecting message without NSVCI. Tx NS STATUS (cause=%s)\n", |
| 648 | nsei, gprs_ns2_cause_str(cause)); |
| 649 | } |
| 650 | |
| 651 | msg->l2h = msgb_put(msg, sizeof(*nsh)); |
| 652 | nsh = (struct gprs_ns_hdr *) msg->l2h; |
| 653 | nsh->pdu_type = NS_PDUT_STATUS; |
| 654 | |
| 655 | msgb_tvlv_put(msg, NS_IE_CAUSE, 1, &_cause); |
Harald Welte | 798efea | 2020-12-03 16:01:02 +0100 | [diff] [blame] | 656 | have_vci = TLVP_PRES_LEN(tp, NS_IE_VCI, 2); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 657 | |
| 658 | /* Section 9.2.7.1: Static conditions for NS-VCI */ |
| 659 | if (cause == NS_CAUSE_NSVC_BLOCKED || |
| 660 | cause == NS_CAUSE_NSVC_UNKNOWN) { |
| 661 | if (!have_vci) { |
| 662 | msgb_free(msg); |
| 663 | return -EINVAL; |
| 664 | } |
| 665 | |
| 666 | msgb_tvlv_put(msg, NS_IE_VCI, 2, TLVP_VAL(tp, NS_IE_VCI)); |
| 667 | } |
| 668 | |
| 669 | /* Section 9.2.7.2: Static conditions for NS PDU */ |
| 670 | switch (cause) { |
| 671 | case NS_CAUSE_SEM_INCORR_PDU: |
| 672 | case NS_CAUSE_PDU_INCOMP_PSTATE: |
| 673 | case NS_CAUSE_PROTO_ERR_UNSPEC: |
| 674 | case NS_CAUSE_INVAL_ESSENT_IE: |
| 675 | case NS_CAUSE_MISSING_ESSENT_IE: |
| 676 | msgb_tvlv_put(msg, NS_IE_PDU, msgb_l2len(orig_msg), |
| 677 | orig_msg->l2h); |
| 678 | break; |
| 679 | default: |
| 680 | break; |
| 681 | } |
| 682 | |
| 683 | *reject = msg; |
| 684 | return 0; |
| 685 | } |
| 686 | |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 687 | /*! Resolve a NS Entity based on its NSEI. |
| 688 | * \param[in] nsi NS Instance in which we do the look-up |
| 689 | * \param[in] nsei NSEI to look up |
| 690 | * \return NS Entity in successful case; NULL if none found */ |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 691 | struct gprs_ns2_nse *gprs_ns2_nse_by_nsei(struct gprs_ns2_inst *nsi, uint16_t nsei) |
| 692 | { |
| 693 | struct gprs_ns2_nse *nse; |
| 694 | |
| 695 | llist_for_each_entry(nse, &nsi->nse, list) { |
| 696 | if (nse->nsei == nsei) |
| 697 | return nse; |
| 698 | } |
| 699 | |
| 700 | return NULL; |
| 701 | } |
| 702 | |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 703 | /*! Resolve a NS-VC Entity based on its NS-VCI. |
| 704 | * \param[in] nsi NS Instance in which we do the look-up |
| 705 | * \param[in] nsvci NS-VCI to look up |
| 706 | * \return NS-VC Entity in successful case; NULL if none found */ |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 707 | struct gprs_ns2_vc *gprs_ns2_nsvc_by_nsvci(struct gprs_ns2_inst *nsi, uint16_t nsvci) |
| 708 | { |
| 709 | struct gprs_ns2_nse *nse; |
| 710 | struct gprs_ns2_vc *nsvc; |
| 711 | |
| 712 | llist_for_each_entry(nse, &nsi->nse, list) { |
| 713 | llist_for_each_entry(nsvc, &nse->nsvc, list) { |
| 714 | if (nsvc->nsvci_is_valid && nsvc->nsvci == nsvci) |
| 715 | return nsvc; |
| 716 | } |
| 717 | } |
| 718 | |
| 719 | return NULL; |
| 720 | } |
| 721 | |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 722 | /*! Create a NS Entity within given NS instance. |
| 723 | * \param[in] nsi NS instance in which to create NS Entity |
| 724 | * \param[in] nsei NS Entity Identifier of to-be-created NSE |
| 725 | * \returns newly-allocated NS-E in successful case; NULL on error */ |
Alexander Couzens | d923cff | 2020-12-01 01:03:52 +0100 | [diff] [blame] | 726 | struct gprs_ns2_nse *gprs_ns2_create_nse(struct gprs_ns2_inst *nsi, uint16_t nsei, |
| 727 | enum gprs_ns2_ll linklayer, enum gprs_ns2_dialect dialect) |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 728 | { |
| 729 | struct gprs_ns2_nse *nse; |
Alexander Couzens | 93ad499 | 2020-12-06 03:03:03 +0100 | [diff] [blame] | 730 | char sns[16]; |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 731 | |
| 732 | nse = gprs_ns2_nse_by_nsei(nsi, nsei); |
| 733 | if (nse) { |
Harald Welte | f294974 | 2021-01-20 14:54:14 +0100 | [diff] [blame] | 734 | LOGNSE(nse, LOGL_ERROR, "Can not create a NSE with already taken NSEI\n"); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 735 | return nse; |
| 736 | } |
| 737 | |
| 738 | nse = talloc_zero(nsi, struct gprs_ns2_nse); |
| 739 | if (!nse) |
| 740 | return NULL; |
| 741 | |
Alexander Couzens | 138b96f | 2021-01-25 16:23:29 +0100 | [diff] [blame] | 742 | if (dialect == GPRS_NS2_DIALECT_SNS) { |
Alexander Couzens | 93ad499 | 2020-12-06 03:03:03 +0100 | [diff] [blame] | 743 | snprintf(sns, sizeof(sns), "NSE%05u-SNS", nsei); |
| 744 | nse->bss_sns_fi = ns2_sns_bss_fsm_alloc(nse, sns); |
| 745 | if (!nse->bss_sns_fi) { |
| 746 | talloc_free(nse); |
| 747 | return NULL; |
| 748 | } |
| 749 | } |
| 750 | |
Alexander Couzens | d923cff | 2020-12-01 01:03:52 +0100 | [diff] [blame] | 751 | nse->dialect = dialect; |
Alexander Couzens | aac9016 | 2020-11-19 02:44:04 +0100 | [diff] [blame] | 752 | nse->ll = linklayer; |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 753 | nse->nsei = nsei; |
| 754 | nse->nsi = nsi; |
Alexander Couzens | da0a285 | 2020-10-01 23:24:07 +0200 | [diff] [blame] | 755 | nse->first = true; |
Alexander Couzens | 4f1128f | 2021-01-20 17:42:48 +0100 | [diff] [blame^] | 756 | nse->mtu = 0; |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 757 | llist_add(&nse->list, &nsi->nse); |
| 758 | INIT_LLIST_HEAD(&nse->nsvc); |
| 759 | |
| 760 | return nse; |
| 761 | } |
| 762 | |
Alexander Couzens | 05e7f7d | 2020-10-11 19:51:46 +0200 | [diff] [blame] | 763 | /*! Return the NSEI |
| 764 | * \param[in] nse NS Entity |
| 765 | * \return the nsei. |
| 766 | */ |
| 767 | uint16_t gprs_ns2_nse_nsei(struct gprs_ns2_nse *nse) |
| 768 | { |
| 769 | return nse->nsei; |
| 770 | } |
| 771 | |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 772 | /*! Destroy given NS Entity. |
| 773 | * \param[in] nse NS Entity to destroy */ |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 774 | void gprs_ns2_free_nse(struct gprs_ns2_nse *nse) |
| 775 | { |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 776 | if (!nse) |
| 777 | return; |
| 778 | |
Alexander Couzens | d1cd650 | 2021-01-15 02:16:23 +0100 | [diff] [blame] | 779 | nse->alive = false; |
Alexander Couzens | 4755879 | 2020-12-06 03:16:11 +0100 | [diff] [blame] | 780 | gprs_ns2_free_nsvcs(nse); |
Alexander Couzens | 138b96f | 2021-01-25 16:23:29 +0100 | [diff] [blame] | 781 | ns2_prim_status_ind(nse, NULL, 0, GPRS_NS2_AFF_CAUSE_FAILURE); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 782 | |
| 783 | llist_del(&nse->list); |
| 784 | if (nse->bss_sns_fi) |
| 785 | osmo_fsm_inst_term(nse->bss_sns_fi, OSMO_FSM_TERM_REQUEST, NULL); |
| 786 | talloc_free(nse); |
| 787 | } |
| 788 | |
Alexander Couzens | 4b6c8af | 2020-10-11 20:15:25 +0200 | [diff] [blame] | 789 | void gprs_ns2_free_nses(struct gprs_ns2_inst *nsi) |
| 790 | { |
| 791 | struct gprs_ns2_nse *nse, *ntmp; |
| 792 | |
| 793 | llist_for_each_entry_safe(nse, ntmp, &nsi->nse, list) { |
| 794 | gprs_ns2_free_nse(nse); |
| 795 | } |
| 796 | } |
| 797 | |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 798 | static inline int ns2_tlv_parse(struct tlv_parsed *dec, |
| 799 | const uint8_t *buf, int buf_len, uint8_t lv_tag, |
| 800 | uint8_t lv_tag2) |
| 801 | { |
| 802 | /* workaround for NS_IE_IP_ADDR not following any known TLV rules. |
| 803 | * See comment of ns_att_tlvdef1. */ |
| 804 | int rc = tlv_parse(dec, &ns_att_tlvdef1, buf, buf_len, lv_tag, lv_tag2); |
| 805 | if (rc < 0) |
| 806 | return tlv_parse(dec, &ns_att_tlvdef2, buf, buf_len, lv_tag, lv_tag2); |
| 807 | return rc; |
| 808 | } |
| 809 | |
| 810 | |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 811 | /*! Create a new NS-VC based on a [received] message. Depending on the bind it might create a NSE. |
| 812 | * \param[in] bind the bind through which msg was received |
| 813 | * \param[in] msg the actual received message |
| 814 | * \param[in] logname A name to describe the VC. E.g. ip address pair |
| 815 | * \param[out] reject A message filled to be sent back. Only used in failure cases. |
| 816 | * \param[out] success A pointer which will be set to the new VC on success |
| 817 | * \return enum value indicating the status, e.g. GPRS_NS2_CS_CREATED */ |
Alexander Couzens | ba5a992 | 2021-01-25 16:03:23 +0100 | [diff] [blame] | 818 | enum ns2_cs ns2_create_vc(struct gprs_ns2_vc_bind *bind, |
| 819 | struct msgb *msg, |
| 820 | const char *logname, |
| 821 | struct msgb **reject, |
| 822 | struct gprs_ns2_vc **success) |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 823 | { |
| 824 | struct gprs_ns_hdr *nsh = (struct gprs_ns_hdr *)msg->l2h; |
| 825 | struct tlv_parsed tp; |
| 826 | struct gprs_ns2_vc *nsvc; |
| 827 | struct gprs_ns2_nse *nse; |
Alexander Couzens | d923cff | 2020-12-01 01:03:52 +0100 | [diff] [blame] | 828 | enum gprs_ns2_dialect dialect; |
| 829 | enum gprs_ns2_vc_mode vc_mode; |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 830 | uint16_t nsvci; |
| 831 | uint16_t nsei; |
Harald Welte | 603f404 | 2020-11-29 17:39:19 +0100 | [diff] [blame] | 832 | char idbuf[32]; |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 833 | |
Alexander Couzens | 12e5e6b | 2020-12-10 00:18:17 +0100 | [diff] [blame] | 834 | int rc, tlv; |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 835 | |
| 836 | if (msg->len < sizeof(struct gprs_ns_hdr)) |
Alexander Couzens | ba5a992 | 2021-01-25 16:03:23 +0100 | [diff] [blame] | 837 | return NS2_CS_ERROR; |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 838 | |
Alexander Couzens | 12e5e6b | 2020-12-10 00:18:17 +0100 | [diff] [blame] | 839 | /* parse the tlv early to allow reject status msg to |
| 840 | * work with valid tp. |
| 841 | * Ignore the return code until the pdu type is parsed because |
| 842 | * an unknown pdu type should be ignored */ |
| 843 | tlv = ns2_tlv_parse(&tp, nsh->data, |
Alexander Couzens | bac5b01 | 2020-12-09 23:32:22 +0100 | [diff] [blame] | 844 | msgb_l2len(msg) - sizeof(*nsh), 0, 0); |
Alexander Couzens | bac5b01 | 2020-12-09 23:32:22 +0100 | [diff] [blame] | 845 | |
Alexander Couzens | d87a2f1 | 2020-11-30 22:20:20 +0100 | [diff] [blame] | 846 | switch (nsh->pdu_type) { |
| 847 | case NS_PDUT_STATUS: |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 848 | /* Do not respond, see 3GPP TS 08.16, 7.5.1 */ |
| 849 | LOGP(DLNS, LOGL_INFO, "Ignoring NS STATUS from %s " |
| 850 | "for non-existing NS-VC\n", |
| 851 | logname); |
Alexander Couzens | ba5a992 | 2021-01-25 16:03:23 +0100 | [diff] [blame] | 852 | return NS2_CS_SKIPPED; |
Alexander Couzens | d87a2f1 | 2020-11-30 22:20:20 +0100 | [diff] [blame] | 853 | case NS_PDUT_ALIVE_ACK: |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 854 | /* Ignore this, see 3GPP TS 08.16, 7.4.1 */ |
| 855 | LOGP(DLNS, LOGL_INFO, "Ignoring NS ALIVE ACK from %s " |
| 856 | "for non-existing NS-VC\n", |
| 857 | logname); |
Alexander Couzens | ba5a992 | 2021-01-25 16:03:23 +0100 | [diff] [blame] | 858 | return NS2_CS_SKIPPED; |
Alexander Couzens | d87a2f1 | 2020-11-30 22:20:20 +0100 | [diff] [blame] | 859 | case NS_PDUT_RESET_ACK: |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 860 | /* Ignore this, see 3GPP TS 08.16, 7.3.1 */ |
| 861 | LOGP(DLNS, LOGL_INFO, "Ignoring NS RESET ACK from %s " |
| 862 | "for non-existing NS-VC\n", |
| 863 | logname); |
Alexander Couzens | ba5a992 | 2021-01-25 16:03:23 +0100 | [diff] [blame] | 864 | return NS2_CS_SKIPPED; |
Alexander Couzens | d87a2f1 | 2020-11-30 22:20:20 +0100 | [diff] [blame] | 865 | case NS_PDUT_RESET: |
| 866 | /* accept PDU RESET when vc_mode matches */ |
Alexander Couzens | d923cff | 2020-12-01 01:03:52 +0100 | [diff] [blame] | 867 | if (bind->accept_ipaccess) { |
Alexander Couzens | 138b96f | 2021-01-25 16:23:29 +0100 | [diff] [blame] | 868 | dialect = GPRS_NS2_DIALECT_IPACCESS; |
Alexander Couzens | d87a2f1 | 2020-11-30 22:20:20 +0100 | [diff] [blame] | 869 | break; |
Alexander Couzens | d923cff | 2020-12-01 01:03:52 +0100 | [diff] [blame] | 870 | } |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 871 | |
Alexander Couzens | d87a2f1 | 2020-11-30 22:20:20 +0100 | [diff] [blame] | 872 | rc = reject_status_msg(msg, &tp, reject, NS_CAUSE_PDU_INCOMP_PSTATE); |
Alexander Couzens | 3c22f91 | 2020-12-10 00:20:18 +0100 | [diff] [blame] | 873 | if (rc < 0) |
Alexander Couzens | d87a2f1 | 2020-11-30 22:20:20 +0100 | [diff] [blame] | 874 | LOGP(DLNS, LOGL_ERROR, "Failed to generate reject message (%d)\n", rc); |
Alexander Couzens | ba5a992 | 2021-01-25 16:03:23 +0100 | [diff] [blame] | 875 | return NS2_CS_REJECTED; |
Alexander Couzens | d87a2f1 | 2020-11-30 22:20:20 +0100 | [diff] [blame] | 876 | default: |
Alexander Couzens | 8ebc1ac | 2020-10-12 03:57:26 +0200 | [diff] [blame] | 877 | rc = reject_status_msg(msg, &tp, reject, NS_CAUSE_PDU_INCOMP_PSTATE); |
Alexander Couzens | 3c22f91 | 2020-12-10 00:20:18 +0100 | [diff] [blame] | 878 | if (rc < 0) |
Alexander Couzens | 8ebc1ac | 2020-10-12 03:57:26 +0200 | [diff] [blame] | 879 | LOGP(DLNS, LOGL_ERROR, "Failed to generate reject message (%d)\n", rc); |
Alexander Couzens | ba5a992 | 2021-01-25 16:03:23 +0100 | [diff] [blame] | 880 | return NS2_CS_REJECTED; |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 881 | } |
| 882 | |
Alexander Couzens | 12e5e6b | 2020-12-10 00:18:17 +0100 | [diff] [blame] | 883 | if (tlv < 0) { |
| 884 | /* TODO: correct behaviour would checking what's wrong. |
| 885 | * If it's an essential TLV for the PDU return NS_CAUSE_INVAL_ESSENT_IE. |
| 886 | * Otherwise ignore the non-essential TLV. */ |
| 887 | LOGP(DLNS, LOGL_ERROR, "Rx NS RESET Error %d during " |
| 888 | "TLV Parse\n", tlv); |
| 889 | rc = reject_status_msg(msg, &tp, reject, NS_CAUSE_PROTO_ERR_UNSPEC); |
Alexander Couzens | 3c22f91 | 2020-12-10 00:20:18 +0100 | [diff] [blame] | 890 | if (rc < 0) |
Alexander Couzens | 12e5e6b | 2020-12-10 00:18:17 +0100 | [diff] [blame] | 891 | LOGP(DLNS, LOGL_ERROR, "Failed to generate reject message (%d)\n", rc); |
Alexander Couzens | ba5a992 | 2021-01-25 16:03:23 +0100 | [diff] [blame] | 892 | return NS2_CS_REJECTED; |
Alexander Couzens | 12e5e6b | 2020-12-10 00:18:17 +0100 | [diff] [blame] | 893 | } |
| 894 | |
Harald Welte | 798efea | 2020-12-03 16:01:02 +0100 | [diff] [blame] | 895 | if (!TLVP_PRES_LEN(&tp, NS_IE_CAUSE, 1) || |
| 896 | !TLVP_PRES_LEN(&tp, NS_IE_VCI, 2) || !TLVP_PRES_LEN(&tp, NS_IE_NSEI, 2)) { |
Alexander Couzens | 8ebc1ac | 2020-10-12 03:57:26 +0200 | [diff] [blame] | 897 | LOGP(DLNS, LOGL_ERROR, "NS RESET Missing mandatory IE\n"); |
| 898 | rc = reject_status_msg(msg, &tp, reject, NS_CAUSE_MISSING_ESSENT_IE); |
Alexander Couzens | 3c22f91 | 2020-12-10 00:20:18 +0100 | [diff] [blame] | 899 | if (rc < 0) |
| 900 | LOGP(DLNS, LOGL_ERROR, "Failed to generate reject message (%d)\n", rc); |
Alexander Couzens | ba5a992 | 2021-01-25 16:03:23 +0100 | [diff] [blame] | 901 | return NS2_CS_REJECTED; |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 902 | } |
| 903 | |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 904 | nsei = tlvp_val16be(&tp, NS_IE_NSEI); |
Alexander Couzens | 05ac4e5 | 2021-01-04 19:07:05 +0100 | [diff] [blame] | 905 | nsvci = tlvp_val16be(&tp, NS_IE_VCI); |
| 906 | |
| 907 | /* find or create NSE */ |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 908 | nse = gprs_ns2_nse_by_nsei(bind->nsi, nsei); |
| 909 | if (!nse) { |
Alexander Couzens | 05ac4e5 | 2021-01-04 19:07:05 +0100 | [diff] [blame] | 910 | /* only create nse for udp & ipaccess */ |
Alexander Couzens | 138b96f | 2021-01-25 16:23:29 +0100 | [diff] [blame] | 911 | if (bind->ll != GPRS_NS2_LL_UDP || dialect != GPRS_NS2_DIALECT_IPACCESS) |
Alexander Couzens | ba5a992 | 2021-01-25 16:03:23 +0100 | [diff] [blame] | 912 | return NS2_CS_SKIPPED; |
Alexander Couzens | 05ac4e5 | 2021-01-04 19:07:05 +0100 | [diff] [blame] | 913 | |
Alexander Couzens | 2e1a3a9 | 2021-01-27 20:44:41 +0100 | [diff] [blame] | 914 | if (!bind->accept_ipaccess) |
Alexander Couzens | ba5a992 | 2021-01-25 16:03:23 +0100 | [diff] [blame] | 915 | return NS2_CS_SKIPPED; |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 916 | |
Alexander Couzens | d923cff | 2020-12-01 01:03:52 +0100 | [diff] [blame] | 917 | nse = gprs_ns2_create_nse(bind->nsi, nsei, bind->ll, dialect); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 918 | if (!nse) { |
Alexander Couzens | 05ac4e5 | 2021-01-04 19:07:05 +0100 | [diff] [blame] | 919 | LOGP(DLNS, LOGL_ERROR, "Failed to create NSE(%05u)\n", nsei); |
Alexander Couzens | ba5a992 | 2021-01-25 16:03:23 +0100 | [diff] [blame] | 920 | return NS2_CS_ERROR; |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 921 | } |
Alexander Couzens | 05ac4e5 | 2021-01-04 19:07:05 +0100 | [diff] [blame] | 922 | } else { |
| 923 | /* nsei already known */ |
| 924 | if (nse->ll != bind->ll) { |
Harald Welte | f294974 | 2021-01-20 14:54:14 +0100 | [diff] [blame] | 925 | LOGNSE(nse, LOGL_ERROR, "Received NS-RESET NS-VCI(%05u) with wrong linklayer(%s)" |
| 926 | " for already known NSE(%s)\n", nsvci, gprs_ns2_lltype_str(bind->ll), |
| 927 | gprs_ns2_lltype_str(nse->ll)); |
Alexander Couzens | ba5a992 | 2021-01-25 16:03:23 +0100 | [diff] [blame] | 928 | return NS2_CS_SKIPPED; |
Alexander Couzens | 05ac4e5 | 2021-01-04 19:07:05 +0100 | [diff] [blame] | 929 | } |
| 930 | } |
| 931 | |
| 932 | nsvc = gprs_ns2_nsvc_by_nsvci(bind->nsi, nsvci); |
| 933 | if (nsvc) { |
| 934 | if (nsvc->persistent) { |
Harald Welte | f294974 | 2021-01-20 14:54:14 +0100 | [diff] [blame] | 935 | LOGNSVC(nsvc, LOGL_ERROR, "Received NS-RESET for a persistent NSE over wrong connection.\n"); |
Alexander Couzens | ba5a992 | 2021-01-25 16:03:23 +0100 | [diff] [blame] | 936 | return NS2_CS_SKIPPED; |
Alexander Couzens | 05ac4e5 | 2021-01-04 19:07:05 +0100 | [diff] [blame] | 937 | } |
| 938 | /* destroy old dynamic nsvc */ |
| 939 | gprs_ns2_free_nsvc(nsvc); |
| 940 | } |
| 941 | |
| 942 | /* do nse persistent check late to be more precise on the error message */ |
| 943 | if (nse->persistent) { |
Harald Welte | f294974 | 2021-01-20 14:54:14 +0100 | [diff] [blame] | 944 | LOGNSE(nse, LOGL_ERROR, "Received NS-RESET for a persistent NSE but the unknown " |
| 945 | "NS-VCI(%05u)\n", nsvci); |
Alexander Couzens | ba5a992 | 2021-01-25 16:03:23 +0100 | [diff] [blame] | 946 | return NS2_CS_SKIPPED; |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 947 | } |
| 948 | |
Harald Welte | 603f404 | 2020-11-29 17:39:19 +0100 | [diff] [blame] | 949 | nsvci = tlvp_val16be(&tp, NS_IE_VCI); |
Alexander Couzens | 8dfc24c | 2021-01-25 16:09:23 +0100 | [diff] [blame] | 950 | vc_mode = ns2_dialect_to_vc_mode(dialect); |
Harald Welte | 603f404 | 2020-11-29 17:39:19 +0100 | [diff] [blame] | 951 | snprintf(idbuf, sizeof(idbuf), "%s-NSE%05u-NSVC%05u", gprs_ns2_lltype_str(nse->ll), |
| 952 | nse->nsei, nsvci); |
| 953 | nsvc = ns2_vc_alloc(bind, nse, false, vc_mode, idbuf); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 954 | if (!nsvc) |
Alexander Couzens | ba5a992 | 2021-01-25 16:03:23 +0100 | [diff] [blame] | 955 | return NS2_CS_SKIPPED; |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 956 | |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 957 | nsvc->nsvci = nsvci; |
| 958 | nsvc->nsvci_is_valid = true; |
| 959 | |
| 960 | *success = nsvc; |
| 961 | |
Alexander Couzens | ba5a992 | 2021-01-25 16:03:23 +0100 | [diff] [blame] | 962 | return NS2_CS_CREATED; |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 963 | } |
| 964 | |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 965 | /*! Create, and connect an inactive, new IP-based NS-VC |
| 966 | * \param[in] bind bind in which the new NS-VC is to be created |
| 967 | * \param[in] remote remote address to which to connect |
| 968 | * \param[in] nse NS Entity in which the NS-VC is to be created |
| 969 | * \param[in] nsvci is only required when bind->vc_mode == NS2_VC_MODE_BLOCKRESET |
| 970 | * \return pointer to newly-allocated, connected and inactive NS-VC; NULL on error */ |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 971 | struct gprs_ns2_vc *gprs_ns2_ip_connect_inactive(struct gprs_ns2_vc_bind *bind, |
Vadim Yanitskiy | a07f25e | 2020-10-09 21:47:01 +0700 | [diff] [blame] | 972 | const struct osmo_sockaddr *remote, |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 973 | struct gprs_ns2_nse *nse, |
| 974 | uint16_t nsvci) |
| 975 | { |
| 976 | struct gprs_ns2_vc *nsvc; |
| 977 | |
Alexander Couzens | 8dfc24c | 2021-01-25 16:09:23 +0100 | [diff] [blame] | 978 | nsvc = ns2_ip_bind_connect(bind, nse, remote); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 979 | if (!nsvc) |
| 980 | return NULL; |
| 981 | |
Alexander Couzens | 138b96f | 2021-01-25 16:23:29 +0100 | [diff] [blame] | 982 | if (nsvc->mode == GPRS_NS2_VC_MODE_BLOCKRESET) { |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 983 | nsvc->nsvci = nsvci; |
| 984 | nsvc->nsvci_is_valid = true; |
| 985 | } |
| 986 | |
| 987 | return nsvc; |
| 988 | } |
| 989 | |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 990 | /*! Create, connect and activate a new IP-based NS-VC |
| 991 | * \param[in] bind bind in which the new NS-VC is to be created |
| 992 | * \param[in] remote remote address to which to connect |
| 993 | * \param[in] nse NS Entity in which the NS-VC is to be created |
| 994 | * \param[in] nsvci is only required when bind->vc_mode == NS2_VC_MODE_BLOCKRESET |
| 995 | * \return pointer to newly-allocated, connected and activated NS-VC; NULL on error */ |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 996 | struct gprs_ns2_vc *gprs_ns2_ip_connect(struct gprs_ns2_vc_bind *bind, |
Vadim Yanitskiy | a07f25e | 2020-10-09 21:47:01 +0700 | [diff] [blame] | 997 | const struct osmo_sockaddr *remote, |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 998 | struct gprs_ns2_nse *nse, |
| 999 | uint16_t nsvci) |
| 1000 | { |
| 1001 | struct gprs_ns2_vc *nsvc; |
| 1002 | nsvc = gprs_ns2_ip_connect_inactive(bind, remote, nse, nsvci); |
| 1003 | if (!nsvc) |
| 1004 | return NULL; |
| 1005 | |
Alexander Couzens | 8dfc24c | 2021-01-25 16:09:23 +0100 | [diff] [blame] | 1006 | ns2_vc_fsm_start(nsvc); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1007 | |
| 1008 | return nsvc; |
| 1009 | } |
| 1010 | |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 1011 | /*! Create, connect and activate a new IP-based NS-VC |
| 1012 | * \param[in] bind bind in which the new NS-VC is to be created |
| 1013 | * \param[in] remote remote address to which to connect |
| 1014 | * \param[in] nsei NSEI of the NS Entity in which the NS-VC is to be created |
| 1015 | * \param[in] nsvci is only required when bind->vc_mode == NS2_VC_MODE_BLOCKRESET |
| 1016 | * \return pointer to newly-allocated, connected and activated NS-VC; NULL on error */ |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1017 | struct gprs_ns2_vc *gprs_ns2_ip_connect2(struct gprs_ns2_vc_bind *bind, |
Vadim Yanitskiy | a07f25e | 2020-10-09 21:47:01 +0700 | [diff] [blame] | 1018 | const struct osmo_sockaddr *remote, |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1019 | uint16_t nsei, |
Alexander Couzens | d923cff | 2020-12-01 01:03:52 +0100 | [diff] [blame] | 1020 | uint16_t nsvci, |
| 1021 | enum gprs_ns2_dialect dialect) |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1022 | { |
| 1023 | struct gprs_ns2_nse *nse = gprs_ns2_nse_by_nsei(bind->nsi, nsei); |
| 1024 | |
| 1025 | if (!nse) { |
Alexander Couzens | d923cff | 2020-12-01 01:03:52 +0100 | [diff] [blame] | 1026 | nse = gprs_ns2_create_nse(bind->nsi, nsei, GPRS_NS2_LL_UDP, dialect); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1027 | if (!nse) |
| 1028 | return NULL; |
| 1029 | } |
| 1030 | |
| 1031 | return gprs_ns2_ip_connect(bind, remote, nse, nsvci); |
| 1032 | } |
| 1033 | |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 1034 | /*! Find NS-VC for given socket address. |
| 1035 | * \param[in] nse NS Entity in which to search |
| 1036 | * \param[in] sockaddr socket address to search for |
| 1037 | * \return NS-VC matching sockaddr; NULL if none found */ |
Alexander Couzens | 38b19e8 | 2020-09-23 23:56:37 +0200 | [diff] [blame] | 1038 | struct gprs_ns2_vc *gprs_ns2_nsvc_by_sockaddr_nse(struct gprs_ns2_nse *nse, |
Vadim Yanitskiy | a07f25e | 2020-10-09 21:47:01 +0700 | [diff] [blame] | 1039 | const struct osmo_sockaddr *sockaddr) |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1040 | { |
| 1041 | struct gprs_ns2_vc *nsvc; |
Alexander Couzens | 9a4cf27 | 2020-10-11 20:48:04 +0200 | [diff] [blame] | 1042 | const struct osmo_sockaddr *remote; |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1043 | |
| 1044 | OSMO_ASSERT(nse); |
| 1045 | OSMO_ASSERT(sockaddr); |
| 1046 | |
| 1047 | llist_for_each_entry(nsvc, &nse->nsvc, list) { |
Alexander Couzens | c4229a4 | 2020-10-11 20:58:04 +0200 | [diff] [blame] | 1048 | remote = gprs_ns2_ip_vc_remote(nsvc); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1049 | if (!osmo_sockaddr_cmp(sockaddr, remote)) |
| 1050 | return nsvc; |
| 1051 | } |
| 1052 | |
| 1053 | return NULL; |
| 1054 | } |
| 1055 | |
Alexander Couzens | 6cb5d5f | 2020-10-11 23:23:31 +0200 | [diff] [blame] | 1056 | /*! |
| 1057 | * Iterate over all nsvc of a NS Entity and call the callback. |
| 1058 | * If the callback returns < 0 it aborts the loop and returns the callback return code. |
| 1059 | * \param[in] nse NS Entity to iterate over all nsvcs |
| 1060 | * \param[in] cb the callback to call |
| 1061 | * \param[inout] cb_data the private data of the callback |
| 1062 | * \return 0 if the loop completes. If a callback returns < 0 it will returns this value. |
| 1063 | */ |
| 1064 | int gprs_ns2_nse_foreach_nsvc(struct gprs_ns2_nse *nse, gprs_ns2_foreach_nsvc_cb cb, void *cb_data) |
| 1065 | { |
| 1066 | struct gprs_ns2_vc *nsvc, *tmp; |
| 1067 | int rc = 0; |
| 1068 | llist_for_each_entry_safe(nsvc, tmp, &nse->nsvc, list) { |
| 1069 | rc = cb(nsvc, cb_data); |
| 1070 | if (rc < 0) |
| 1071 | return rc; |
| 1072 | } |
| 1073 | |
| 1074 | return 0; |
| 1075 | } |
| 1076 | |
| 1077 | |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1078 | |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 1079 | /*! Bottom-side entry-point for received NS PDU from the driver/bind |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 1080 | * \param[in] nsvc NS-VC for which the message was received |
| 1081 | * \param msg the received message. Ownership is trasnferred, caller must not free it! |
| 1082 | * \return 0 on success; negative on error */ |
Alexander Couzens | ffd49d0 | 2020-09-24 00:47:17 +0200 | [diff] [blame] | 1083 | int ns2_recv_vc(struct gprs_ns2_vc *nsvc, |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1084 | struct msgb *msg) |
| 1085 | { |
| 1086 | struct gprs_ns_hdr *nsh = (struct gprs_ns_hdr *) msg->l2h; |
Alexander Couzens | ba63453 | 2021-01-25 13:46:38 +0100 | [diff] [blame] | 1087 | struct tlv_parsed tp = { }; |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1088 | int rc = 0; |
| 1089 | |
Daniel Willmann | 751977b | 2020-12-02 18:59:44 +0100 | [diff] [blame] | 1090 | log_set_context(LOG_CTX_GB_NSE, nsvc->nse); |
| 1091 | log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| 1092 | |
Harald Welte | e5f55f7 | 2021-01-30 21:51:15 +0100 | [diff] [blame] | 1093 | rate_ctr_inc(&nsvc->ctrg->ctr[NS_CTR_PKTS_IN]); |
| 1094 | rate_ctr_add(&nsvc->ctrg->ctr[NS_CTR_BYTES_IN], msg->len); |
| 1095 | |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1096 | if (msg->len < sizeof(struct gprs_ns_hdr)) |
| 1097 | return -EINVAL; |
| 1098 | |
| 1099 | switch (nsh->pdu_type) { |
| 1100 | case SNS_PDUT_CONFIG: |
| 1101 | /* one additional byte ('end flag') before the TLV part starts */ |
| 1102 | rc = ns2_tlv_parse(&tp, nsh->data+1, |
| 1103 | msgb_l2len(msg) - sizeof(*nsh)-1, 0, 0); |
| 1104 | if (rc < 0) { |
Alexander Couzens | bb0a53b | 2020-10-12 04:18:03 +0200 | [diff] [blame] | 1105 | LOGP(DLNS, LOGL_NOTICE, "Error during TLV Parse in %s\n", msgb_hexdump(msg)); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1106 | return rc; |
| 1107 | } |
| 1108 | /* All sub-network service related message types */ |
Alexander Couzens | 8dfc24c | 2021-01-25 16:09:23 +0100 | [diff] [blame] | 1109 | rc = ns2_sns_rx(nsvc, msg, &tp); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1110 | break; |
| 1111 | case SNS_PDUT_ACK: |
| 1112 | case SNS_PDUT_ADD: |
| 1113 | case SNS_PDUT_CHANGE_WEIGHT: |
| 1114 | case SNS_PDUT_DELETE: |
| 1115 | /* weird layout: NSEI TLV, then value-only transaction IE, then TLV again */ |
Harald Welte | 36be9d8 | 2020-10-09 15:39:25 +0200 | [diff] [blame] | 1116 | rc = ns2_tlv_parse(&tp, nsh->data+5, |
| 1117 | msgb_l2len(msg) - sizeof(*nsh)-5, 0, 0); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1118 | if (rc < 0) { |
Alexander Couzens | bb0a53b | 2020-10-12 04:18:03 +0200 | [diff] [blame] | 1119 | LOGP(DLNS, LOGL_NOTICE, "Error during TLV Parse in %s\n", msgb_hexdump(msg)); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1120 | return rc; |
| 1121 | } |
| 1122 | tp.lv[NS_IE_NSEI].val = nsh->data+2; |
| 1123 | tp.lv[NS_IE_NSEI].len = 2; |
| 1124 | tp.lv[NS_IE_TRANS_ID].val = nsh->data+4; |
| 1125 | tp.lv[NS_IE_TRANS_ID].len = 1; |
Alexander Couzens | 8dfc24c | 2021-01-25 16:09:23 +0100 | [diff] [blame] | 1126 | rc = ns2_sns_rx(nsvc, msg, &tp); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1127 | break; |
| 1128 | case SNS_PDUT_CONFIG_ACK: |
| 1129 | case SNS_PDUT_SIZE: |
| 1130 | case SNS_PDUT_SIZE_ACK: |
| 1131 | rc = ns2_tlv_parse(&tp, nsh->data, |
| 1132 | msgb_l2len(msg) - sizeof(*nsh), 0, 0); |
| 1133 | if (rc < 0) { |
Alexander Couzens | bb0a53b | 2020-10-12 04:18:03 +0200 | [diff] [blame] | 1134 | LOGP(DLNS, LOGL_NOTICE, "Error during TLV Parse in %s\n", msgb_hexdump(msg)); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1135 | return rc; |
| 1136 | } |
| 1137 | /* All sub-network service related message types */ |
Alexander Couzens | 8dfc24c | 2021-01-25 16:09:23 +0100 | [diff] [blame] | 1138 | rc = ns2_sns_rx(nsvc, msg, &tp); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1139 | break; |
| 1140 | |
| 1141 | case NS_PDUT_UNITDATA: |
Alexander Couzens | 8dfc24c | 2021-01-25 16:09:23 +0100 | [diff] [blame] | 1142 | rc = ns2_vc_rx(nsvc, msg, &tp); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1143 | break; |
| 1144 | default: |
| 1145 | rc = ns2_tlv_parse(&tp, nsh->data, |
| 1146 | msgb_l2len(msg) - sizeof(*nsh), 0, 0); |
| 1147 | if (rc < 0) { |
Alexander Couzens | bb0a53b | 2020-10-12 04:18:03 +0200 | [diff] [blame] | 1148 | LOGP(DLNS, LOGL_NOTICE, "Error during TLV Parse\n"); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1149 | if (nsh->pdu_type != NS_PDUT_STATUS) |
| 1150 | ns2_tx_status(nsvc, NS_CAUSE_PROTO_ERR_UNSPEC, 0, msg); |
| 1151 | return rc; |
| 1152 | } |
Alexander Couzens | 8dfc24c | 2021-01-25 16:09:23 +0100 | [diff] [blame] | 1153 | rc = ns2_vc_rx(nsvc, msg, &tp); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1154 | break; |
| 1155 | } |
| 1156 | |
| 1157 | return rc; |
| 1158 | } |
| 1159 | |
Alexander Couzens | fc3dd1f | 2020-11-19 00:41:47 +0100 | [diff] [blame] | 1160 | /* summarize all active data nsvcs */ |
| 1161 | void ns2_nse_data_sum(struct gprs_ns2_nse *nse) |
| 1162 | { |
| 1163 | struct gprs_ns2_vc *nsvc; |
Harald Welte | 3221f87 | 2021-01-18 14:58:51 +0100 | [diff] [blame] | 1164 | |
Alexander Couzens | 8a2a1a4 | 2020-12-26 18:00:17 +0100 | [diff] [blame] | 1165 | nse->nsvc_count = 0; |
Harald Welte | 3221f87 | 2021-01-18 14:58:51 +0100 | [diff] [blame] | 1166 | nse->sum_data_weight = 0; |
| 1167 | nse->sum_sig_weight = 0; |
Alexander Couzens | fc3dd1f | 2020-11-19 00:41:47 +0100 | [diff] [blame] | 1168 | |
| 1169 | llist_for_each_entry(nsvc, &nse->nsvc, list) { |
Alexander Couzens | 8dfc24c | 2021-01-25 16:09:23 +0100 | [diff] [blame] | 1170 | if (!ns2_vc_is_unblocked(nsvc)) |
Alexander Couzens | fc3dd1f | 2020-11-19 00:41:47 +0100 | [diff] [blame] | 1171 | continue; |
Alexander Couzens | 8a2a1a4 | 2020-12-26 18:00:17 +0100 | [diff] [blame] | 1172 | |
| 1173 | nse->nsvc_count++; |
Harald Welte | 3221f87 | 2021-01-18 14:58:51 +0100 | [diff] [blame] | 1174 | nse->sum_data_weight += nsvc->data_weight; |
| 1175 | nse->sum_sig_weight += nsvc->sig_weight; |
Alexander Couzens | fc3dd1f | 2020-11-19 00:41:47 +0100 | [diff] [blame] | 1176 | } |
| 1177 | } |
| 1178 | |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 1179 | /*! Notify a nse about the change of a NS-VC. |
| 1180 | * \param[in] nsvc NS-VC which has detected the change (and shall not be notified). |
| 1181 | * \param[in] unblocked whether the NSE should be marked as unblocked (true) or blocked (false) */ |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1182 | void ns2_nse_notify_unblocked(struct gprs_ns2_vc *nsvc, bool unblocked) |
| 1183 | { |
| 1184 | struct gprs_ns2_nse *nse = nsvc->nse; |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1185 | |
Alexander Couzens | be7cecc | 2021-02-03 18:25:27 +0100 | [diff] [blame] | 1186 | ns2_sns_notify_alive(nse, nsvc, unblocked); |
Alexander Couzens | fc3dd1f | 2020-11-19 00:41:47 +0100 | [diff] [blame] | 1187 | ns2_nse_data_sum(nse); |
| 1188 | |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1189 | if (unblocked == nse->alive) |
| 1190 | return; |
| 1191 | |
Harald Welte | 3221f87 | 2021-01-18 14:58:51 +0100 | [diff] [blame] | 1192 | /* wait until both data_weight and sig_weight are != 0 before declaring NSE as alive */ |
| 1193 | if (unblocked && nse->sum_data_weight && nse->sum_sig_weight) { |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1194 | nse->alive = true; |
Alexander Couzens | 138b96f | 2021-01-25 16:23:29 +0100 | [diff] [blame] | 1195 | ns2_prim_status_ind(nse, NULL, 0, GPRS_NS2_AFF_CAUSE_RECOVERY); |
Alexander Couzens | da0a285 | 2020-10-01 23:24:07 +0200 | [diff] [blame] | 1196 | nse->first = false; |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1197 | return; |
| 1198 | } |
| 1199 | |
Harald Welte | 3221f87 | 2021-01-18 14:58:51 +0100 | [diff] [blame] | 1200 | if (nse->alive && (nse->sum_data_weight == 0 || nse->sum_sig_weight == 0)) { |
| 1201 | /* nse became unavailable */ |
| 1202 | nse->alive = false; |
Alexander Couzens | 138b96f | 2021-01-25 16:23:29 +0100 | [diff] [blame] | 1203 | ns2_prim_status_ind(nse, NULL, 0, GPRS_NS2_AFF_CAUSE_FAILURE); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1204 | } |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1205 | } |
| 1206 | |
| 1207 | /*! Create a new GPRS NS instance |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 1208 | * \param[in] ctx a talloc context to allocate NS instance from |
Alexander Couzens | cce8828 | 2020-10-26 00:25:50 +0100 | [diff] [blame] | 1209 | * \param[in] cb Call-back function for dispatching primitives to the user. The Call-back must free all msgb* given in the primitive. |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 1210 | * \param[in] cb_data transparent user data passed to Call-back |
| 1211 | * \returns dynamically allocated gprs_ns_inst; NULL on error */ |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1212 | struct gprs_ns2_inst *gprs_ns2_instantiate(void *ctx, osmo_prim_cb cb, void *cb_data) |
| 1213 | { |
| 1214 | struct gprs_ns2_inst *nsi; |
| 1215 | |
| 1216 | nsi = talloc_zero(ctx, struct gprs_ns2_inst); |
| 1217 | if (!nsi) |
| 1218 | return NULL; |
| 1219 | |
| 1220 | nsi->cb = cb; |
| 1221 | nsi->cb_data = cb_data; |
| 1222 | INIT_LLIST_HEAD(&nsi->binding); |
| 1223 | INIT_LLIST_HEAD(&nsi->nse); |
| 1224 | |
| 1225 | nsi->timeout[NS_TOUT_TNS_BLOCK] = 3; |
| 1226 | nsi->timeout[NS_TOUT_TNS_BLOCK_RETRIES] = 3; |
| 1227 | nsi->timeout[NS_TOUT_TNS_RESET] = 3; |
| 1228 | nsi->timeout[NS_TOUT_TNS_RESET_RETRIES] = 3; |
| 1229 | nsi->timeout[NS_TOUT_TNS_TEST] = 30; |
| 1230 | nsi->timeout[NS_TOUT_TNS_ALIVE] = 3; |
| 1231 | nsi->timeout[NS_TOUT_TNS_ALIVE_RETRIES] = 10; |
| 1232 | nsi->timeout[NS_TOUT_TSNS_PROV] = 3; /* 1..10 */ |
Alexander Couzens | 90ee963 | 2020-12-07 06:18:32 +0100 | [diff] [blame] | 1233 | nsi->timeout[NS_TOUT_TSNS_SIZE_RETRIES] = 3; |
| 1234 | nsi->timeout[NS_TOUT_TSNS_CONFIG_RETRIES] = 3; |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1235 | |
| 1236 | return nsi; |
| 1237 | } |
| 1238 | |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 1239 | /*! Destroy a NS Instance (including all its NSEs, binds, ...). |
| 1240 | * \param[in] nsi NS instance to destroy */ |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1241 | void gprs_ns2_free(struct gprs_ns2_inst *nsi) |
| 1242 | { |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1243 | if (!nsi) |
| 1244 | return; |
| 1245 | |
Alexander Couzens | 4b6c8af | 2020-10-11 20:15:25 +0200 | [diff] [blame] | 1246 | gprs_ns2_free_nses(nsi); |
Alexander Couzens | 896fcd5 | 2020-10-11 19:52:36 +0200 | [diff] [blame] | 1247 | gprs_ns2_free_binds(nsi); |
Alexander Couzens | 3531504 | 2020-10-10 03:28:17 +0200 | [diff] [blame] | 1248 | |
| 1249 | talloc_free(nsi); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1250 | } |
| 1251 | |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 1252 | /*! Start the NS-ALIVE FSM in all NS-VCs of given NSE. |
| 1253 | * \param[in] nse NS Entity in whihc to start NS-ALIVE FSMs */ |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1254 | void gprs_ns2_start_alive_all_nsvcs(struct gprs_ns2_nse *nse) |
| 1255 | { |
| 1256 | struct gprs_ns2_vc *nsvc; |
| 1257 | OSMO_ASSERT(nse); |
| 1258 | |
| 1259 | llist_for_each_entry(nsvc, &nse->nsvc, list) { |
| 1260 | if (nsvc->sns_only) |
| 1261 | continue; |
| 1262 | |
Alexander Couzens | 8dfc24c | 2021-01-25 16:09:23 +0100 | [diff] [blame] | 1263 | ns2_vc_fsm_start(nsvc); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1264 | } |
| 1265 | } |
| 1266 | |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 1267 | /*! Destroy a given bind. |
| 1268 | * \param[in] bind the bind we want to destroy */ |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1269 | void gprs_ns2_free_bind(struct gprs_ns2_vc_bind *bind) |
| 1270 | { |
| 1271 | struct gprs_ns2_vc *nsvc, *tmp; |
| 1272 | if (!bind) |
| 1273 | return; |
| 1274 | |
| 1275 | llist_for_each_entry_safe(nsvc, tmp, &bind->nsvc, blist) { |
| 1276 | gprs_ns2_free_nsvc(nsvc); |
| 1277 | } |
| 1278 | |
| 1279 | if (bind->driver->free_bind) |
| 1280 | bind->driver->free_bind(bind); |
| 1281 | |
| 1282 | llist_del(&bind->list); |
Harald Welte | 7634607 | 2021-01-31 11:54:02 +0100 | [diff] [blame] | 1283 | osmo_stat_item_group_free(bind->statg); |
Alexander Couzens | aaa55a6 | 2020-12-03 06:02:03 +0100 | [diff] [blame] | 1284 | talloc_free((char *)bind->name); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1285 | talloc_free(bind); |
| 1286 | } |
Alexander Couzens | 896fcd5 | 2020-10-11 19:52:36 +0200 | [diff] [blame] | 1287 | |
| 1288 | void gprs_ns2_free_binds(struct gprs_ns2_inst *nsi) |
| 1289 | { |
| 1290 | struct gprs_ns2_vc_bind *bind, *tbind; |
| 1291 | |
| 1292 | llist_for_each_entry_safe(bind, tbind, &nsi->binding, list) { |
| 1293 | gprs_ns2_free_bind(bind); |
| 1294 | } |
| 1295 | } |
Alexander Couzens | d923cff | 2020-12-01 01:03:52 +0100 | [diff] [blame] | 1296 | |
Alexander Couzens | aaa55a6 | 2020-12-03 06:02:03 +0100 | [diff] [blame] | 1297 | /*! Search for a bind with a unique name |
| 1298 | * \param[in] nsi NS instance on which we operate |
| 1299 | * \param[in] name The unique bind name to search for |
| 1300 | * \return the bind or NULL if not found |
| 1301 | */ |
Alexander Couzens | 8dfc24c | 2021-01-25 16:09:23 +0100 | [diff] [blame] | 1302 | struct gprs_ns2_vc_bind *gprs_ns2_bind_by_name(struct gprs_ns2_inst *nsi, const char *name) |
Alexander Couzens | aaa55a6 | 2020-12-03 06:02:03 +0100 | [diff] [blame] | 1303 | { |
| 1304 | struct gprs_ns2_vc_bind *bind; |
| 1305 | |
| 1306 | llist_for_each_entry(bind, &nsi->binding, list) { |
| 1307 | if (!strcmp(bind->name, name)) |
| 1308 | return bind; |
| 1309 | } |
| 1310 | |
| 1311 | return NULL; |
| 1312 | } |
| 1313 | |
Alexander Couzens | 8dfc24c | 2021-01-25 16:09:23 +0100 | [diff] [blame] | 1314 | enum gprs_ns2_vc_mode ns2_dialect_to_vc_mode(enum gprs_ns2_dialect dialect) |
Alexander Couzens | d923cff | 2020-12-01 01:03:52 +0100 | [diff] [blame] | 1315 | { |
| 1316 | switch (dialect) { |
Alexander Couzens | 138b96f | 2021-01-25 16:23:29 +0100 | [diff] [blame] | 1317 | case GPRS_NS2_DIALECT_SNS: |
| 1318 | case GPRS_NS2_DIALECT_STATIC_ALIVE: |
| 1319 | return GPRS_NS2_VC_MODE_ALIVE; |
| 1320 | case GPRS_NS2_DIALECT_STATIC_RESETBLOCK: |
| 1321 | case GPRS_NS2_DIALECT_IPACCESS: |
| 1322 | return GPRS_NS2_VC_MODE_BLOCKRESET; |
Alexander Couzens | d923cff | 2020-12-01 01:03:52 +0100 | [diff] [blame] | 1323 | default: |
| 1324 | return -1; |
| 1325 | } |
| 1326 | } |
| 1327 | |
Alexander Couzens | 1c8785d | 2020-12-17 06:58:53 +0100 | [diff] [blame] | 1328 | static void add_bind_array(struct gprs_ns2_vc_bind **array, |
| 1329 | struct gprs_ns2_vc_bind *bind, int size) |
| 1330 | { |
| 1331 | int i; |
| 1332 | for (i=0; i < size; i++) { |
| 1333 | if (array[i] == bind) |
| 1334 | return; |
| 1335 | if (!array[i]) |
| 1336 | break; |
| 1337 | } |
| 1338 | |
| 1339 | if (i == size) |
| 1340 | return; |
| 1341 | |
| 1342 | array[i] = bind; |
| 1343 | } |
| 1344 | |
Alexander Couzens | 4f1128f | 2021-01-20 17:42:48 +0100 | [diff] [blame^] | 1345 | void ns2_nse_update_mtu(struct gprs_ns2_nse *nse) |
| 1346 | { |
| 1347 | struct gprs_ns2_vc *nsvc; |
| 1348 | int mtu = 0; |
| 1349 | |
| 1350 | if (llist_empty(&nse->nsvc)) { |
| 1351 | nse->mtu = 0; |
| 1352 | return; |
| 1353 | } |
| 1354 | |
| 1355 | llist_for_each_entry(nsvc, &nse->nsvc, list) { |
| 1356 | if (mtu == 0) |
| 1357 | mtu = nsvc->bind->mtu; |
| 1358 | else if (mtu > nsvc->bind->mtu) |
| 1359 | mtu = nsvc->bind->mtu; |
| 1360 | } |
| 1361 | |
| 1362 | if (nse->mtu == mtu) |
| 1363 | return; |
| 1364 | |
| 1365 | nse->mtu = mtu; |
| 1366 | if (nse->alive) |
| 1367 | ns2_prim_status_ind(nsvc->nse, NULL, 0, GPRS_NS2_AFF_CAUSE_MTU_CHANGE); |
| 1368 | } |
| 1369 | |
Alexander Couzens | 1c8785d | 2020-12-17 06:58:53 +0100 | [diff] [blame] | 1370 | /*! calculate the transfer capabilities for a nse |
| 1371 | * \param nse the nse to count the transfer capability |
| 1372 | * \param bvci a bvci - unused |
| 1373 | * \return the transfer capability in mbit. On error < 0. |
| 1374 | */ |
| 1375 | int ns2_count_transfer_cap(struct gprs_ns2_nse *nse, |
| 1376 | uint16_t bvci) |
| 1377 | { |
| 1378 | struct gprs_ns2_vc *nsvc; |
| 1379 | struct gprs_ns2_vc_bind **active_binds; |
| 1380 | int i, active_nsvcs = 0, transfer_cap = 0; |
| 1381 | |
| 1382 | /* calculate the transfer capabilities based on the binds. |
| 1383 | * A bind has a transfer capability which is shared across all NSVCs. |
| 1384 | * Take care the bind cap is not counted twice within a NSE. |
| 1385 | * This should be accurate for FR and UDP but not for FR/GRE. */ |
| 1386 | |
| 1387 | if (!nse->alive) |
| 1388 | return 0; |
| 1389 | |
| 1390 | llist_for_each_entry(nsvc, &nse->nsvc, list) { |
Alexander Couzens | 8dfc24c | 2021-01-25 16:09:23 +0100 | [diff] [blame] | 1391 | if (ns2_vc_is_unblocked(nsvc)) |
Alexander Couzens | 1c8785d | 2020-12-17 06:58:53 +0100 | [diff] [blame] | 1392 | active_nsvcs++; |
| 1393 | } |
| 1394 | /* an alive nse should always have active_nsvcs */ |
| 1395 | OSMO_ASSERT(active_nsvcs); |
| 1396 | |
| 1397 | active_binds = talloc_zero_array(nse, struct gprs_ns2_vc_bind*, active_nsvcs); |
| 1398 | if (!active_binds) |
| 1399 | return -ENOMEM; |
| 1400 | |
| 1401 | llist_for_each_entry(nsvc, &nse->nsvc, list) { |
Alexander Couzens | 8dfc24c | 2021-01-25 16:09:23 +0100 | [diff] [blame] | 1402 | if (!ns2_vc_is_unblocked(nsvc)) |
Alexander Couzens | 1c8785d | 2020-12-17 06:58:53 +0100 | [diff] [blame] | 1403 | continue; |
| 1404 | add_bind_array(active_binds, nsvc->bind, active_nsvcs); |
| 1405 | } |
| 1406 | |
| 1407 | /* TODO: change calcuation for FR/GRE */ |
| 1408 | for (i = 0; i < active_nsvcs; i++) { |
| 1409 | if (active_binds[i]) |
| 1410 | transfer_cap += active_binds[i]->transfer_capability; |
| 1411 | } |
| 1412 | |
| 1413 | talloc_free(active_binds); |
| 1414 | return transfer_cap; |
| 1415 | } |
| 1416 | |
Harald Welte | c3aa8f9 | 2021-01-31 11:41:34 +0100 | [diff] [blame] | 1417 | /*! common allocation + low-level initialization of a bind. Called by vc-drivers */ |
| 1418 | int ns2_bind_alloc(struct gprs_ns2_inst *nsi, const char *name, |
| 1419 | struct gprs_ns2_vc_bind **result) |
| 1420 | { |
| 1421 | struct gprs_ns2_vc_bind *bind; |
| 1422 | |
| 1423 | if (!name) |
| 1424 | return -EINVAL; |
| 1425 | |
| 1426 | if (gprs_ns2_bind_by_name(nsi, name)) |
| 1427 | return -EALREADY; |
| 1428 | |
| 1429 | bind = talloc_zero(nsi, struct gprs_ns2_vc_bind); |
| 1430 | if (!bind) |
Harald Welte | bdfb8b9 | 2021-01-31 11:44:57 +0100 | [diff] [blame] | 1431 | return -ENOMEM; |
Harald Welte | c3aa8f9 | 2021-01-31 11:41:34 +0100 | [diff] [blame] | 1432 | |
| 1433 | bind->name = talloc_strdup(bind, name); |
| 1434 | if (!bind->name) { |
| 1435 | talloc_free(bind); |
Harald Welte | bdfb8b9 | 2021-01-31 11:44:57 +0100 | [diff] [blame] | 1436 | return -ENOMEM; |
Harald Welte | c3aa8f9 | 2021-01-31 11:41:34 +0100 | [diff] [blame] | 1437 | } |
| 1438 | |
Harald Welte | 7634607 | 2021-01-31 11:54:02 +0100 | [diff] [blame] | 1439 | bind->statg = osmo_stat_item_group_alloc(bind, &nsbind_statg_desc, nsi->bind_rate_ctr_idx); |
| 1440 | if (!bind->statg) { |
| 1441 | talloc_free(bind); |
| 1442 | return -ENOMEM; |
| 1443 | } |
| 1444 | |
Alexander Couzens | c470476 | 2021-02-08 23:13:12 +0100 | [diff] [blame] | 1445 | bind->sns_sig_weight = 1; |
| 1446 | bind->sns_data_weight = 1; |
Harald Welte | c3aa8f9 | 2021-01-31 11:41:34 +0100 | [diff] [blame] | 1447 | bind->nsi = nsi; |
| 1448 | INIT_LLIST_HEAD(&bind->nsvc); |
| 1449 | llist_add(&bind->list, &nsi->binding); |
| 1450 | |
Harald Welte | 7634607 | 2021-01-31 11:54:02 +0100 | [diff] [blame] | 1451 | nsi->bind_rate_ctr_idx++; |
| 1452 | |
Harald Welte | c3aa8f9 | 2021-01-31 11:41:34 +0100 | [diff] [blame] | 1453 | if (result) |
| 1454 | *result = bind; |
| 1455 | |
| 1456 | return 0; |
| 1457 | } |
| 1458 | |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1459 | /*! @} */ |