Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1 | /* NS-over-IP proxy */ |
| 2 | |
| 3 | /* (C) 2010 by Harald Welte <laforge@gnumonks.org> |
Holger Hans Peter Freyther | 2ea8812 | 2013-10-23 11:24:17 +0200 | [diff] [blame] | 4 | * (C) 2010-2013 by On-Waves |
| 5 | * (C) 2013 by Holger Hans Peter Freyther |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 6 | * All Rights Reserved |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
Harald Welte | 0e3e88e | 2011-01-01 15:25:50 +0100 | [diff] [blame] | 9 | * it under the terms of the GNU Affero General Public License as published by |
| 10 | * the Free Software Foundation; either version 3 of the License, or |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
Harald Welte | 0e3e88e | 2011-01-01 15:25:50 +0100 | [diff] [blame] | 16 | * GNU Affero General Public License for more details. |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 17 | * |
Harald Welte | 0e3e88e | 2011-01-01 15:25:50 +0100 | [diff] [blame] | 18 | * You should have received a copy of the GNU Affero General Public License |
| 19 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 20 | * |
| 21 | */ |
| 22 | |
| 23 | #include <unistd.h> |
| 24 | #include <stdio.h> |
| 25 | #include <stdlib.h> |
| 26 | #include <string.h> |
| 27 | #include <getopt.h> |
| 28 | #include <errno.h> |
| 29 | #include <sys/fcntl.h> |
| 30 | #include <sys/stat.h> |
Harald Welte | f2fdefe | 2010-05-11 10:15:42 +0200 | [diff] [blame] | 31 | #include <arpa/inet.h> |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 32 | #include <time.h> |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 33 | |
Pablo Neira Ayuso | dd5fff4 | 2011-03-22 16:47:59 +0100 | [diff] [blame] | 34 | #include <osmocom/core/talloc.h> |
| 35 | #include <osmocom/core/select.h> |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 36 | #include <osmocom/core/rate_ctr.h> |
| 37 | |
Harald Welte | cfb6b28 | 2012-06-16 14:59:56 +0800 | [diff] [blame] | 38 | #include <osmocom/gprs/gprs_ns.h> |
| 39 | #include <osmocom/gprs/gprs_bssgp.h> |
| 40 | |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 41 | #include <osmocom/gsm/gsm_utils.h> |
| 42 | |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 43 | #include <openbsc/signal.h> |
| 44 | #include <openbsc/debug.h> |
Harald Welte | f01709d | 2010-05-03 18:54:58 +0200 | [diff] [blame] | 45 | #include <openbsc/gb_proxy.h> |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 46 | |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 47 | #include <openbsc/gprs_llc.h> |
| 48 | #include <openbsc/gsm_04_08.h> |
| 49 | #include <openbsc/gsm_04_08_gprs.h> |
| 50 | |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 51 | enum gbprox_global_ctr { |
| 52 | GBPROX_GLOB_CTR_INV_BVCI, |
Jacob Erlbeck | 9d7268a | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 53 | GBPROX_GLOB_CTR_INV_LAI, |
| 54 | GBPROX_GLOB_CTR_INV_RAI, |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 55 | GBPROX_GLOB_CTR_INV_NSEI, |
| 56 | GBPROX_GLOB_CTR_PROTO_ERR_BSS, |
| 57 | GBPROX_GLOB_CTR_PROTO_ERR_SGSN, |
| 58 | GBPROX_GLOB_CTR_NOT_SUPPORTED_BSS, |
| 59 | GBPROX_GLOB_CTR_NOT_SUPPORTED_SGSN, |
| 60 | GBPROX_GLOB_CTR_RESTART_RESET_SGSN, |
| 61 | GBPROX_GLOB_CTR_TX_ERR_SGSN, |
| 62 | GBPROX_GLOB_CTR_OTHER_ERR, |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 63 | GBPROX_GLOB_CTR_PATCH_PEER_ERR, |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 64 | }; |
| 65 | |
| 66 | static const struct rate_ctr_desc global_ctr_description[] = { |
| 67 | { "inv-bvci", "Invalid BVC Identifier " }, |
Jacob Erlbeck | 9d7268a | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 68 | { "inv-lai", "Invalid Location Area Identifier" }, |
| 69 | { "inv-rai", "Invalid Routing Area Identifier " }, |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 70 | { "inv-nsei", "No BVC established for NSEI " }, |
| 71 | { "proto-err.bss", "BSSGP protocol error (BSS )" }, |
| 72 | { "proto-err.sgsn", "BSSGP protocol error (SGSN)" }, |
| 73 | { "not-supp.bss", "Feature not supported (BSS )" }, |
| 74 | { "not-supp.sgsn", "Feature not supported (SGSN)" }, |
| 75 | { "restart.sgsn", "Restarted RESET procedure (SGSN)" }, |
| 76 | { "tx-err.sgsn", "NS Transmission error (SGSN)" }, |
| 77 | { "error", "Other error " }, |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 78 | { "mod-peer-err", "Patch error: no peer " }, |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 79 | }; |
| 80 | |
| 81 | static const struct rate_ctr_group_desc global_ctrg_desc = { |
| 82 | .group_name_prefix = "gbproxy.global", |
| 83 | .group_description = "GBProxy Global Statistics", |
| 84 | .num_ctr = ARRAY_SIZE(global_ctr_description), |
| 85 | .ctr_desc = global_ctr_description, |
| 86 | }; |
| 87 | |
| 88 | static struct rate_ctr_group *global_ctrg = NULL; |
| 89 | |
Holger Hans Peter Freyther | 5eaf1a2 | 2014-08-04 11:10:09 +0200 | [diff] [blame^] | 90 | struct rate_ctr_group *get_global_ctrg(void) |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 91 | { |
| 92 | if (global_ctrg) |
| 93 | return global_ctrg; |
| 94 | |
| 95 | global_ctrg = rate_ctr_group_alloc(tall_bsc_ctx, &global_ctrg_desc, 0); |
| 96 | return global_ctrg; |
| 97 | } |
| 98 | |
| 99 | enum gbprox_peer_ctr { |
| 100 | GBPROX_PEER_CTR_BLOCKED, |
| 101 | GBPROX_PEER_CTR_UNBLOCKED, |
| 102 | GBPROX_PEER_CTR_DROPPED, |
| 103 | GBPROX_PEER_CTR_INV_NSEI, |
| 104 | GBPROX_PEER_CTR_TX_ERR, |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 105 | GBPROX_PEER_CTR_RAID_PATCHED_BSS, |
| 106 | GBPROX_PEER_CTR_RAID_PATCHED_SGSN, |
| 107 | GBPROX_PEER_CTR_APN_PATCHED, |
| 108 | GBPROX_PEER_CTR_PATCH_CRYPT_ERR, |
| 109 | GBPROX_PEER_CTR_PATCH_ERR, |
Jacob Erlbeck | 481da7c | 2014-06-27 10:44:46 +0200 | [diff] [blame] | 110 | GBPROX_PEER_CTR_ATTACH_REQS, |
| 111 | GBPROX_PEER_CTR_ATTACH_REJS, |
| 112 | GBPROX_PEER_CTR_TLLI_CACHE_SIZE, |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 113 | }; |
| 114 | |
| 115 | static const struct rate_ctr_desc peer_ctr_description[] = { |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 116 | { "blocked", "BVC Block " }, |
| 117 | { "unblocked", "BVC Unblock " }, |
| 118 | { "dropped", "BVC blocked, dropped packet " }, |
| 119 | { "inv-nsei", "NSEI mismatch " }, |
| 120 | { "tx-err", "NS Transmission error " }, |
| 121 | { "raid-mod.bss", "RAID patched (BSS )" }, |
| 122 | { "raid-mod.sgsn", "RAID patched (SGSN)" }, |
| 123 | { "apn-mod.sgsn", "APN patched " }, |
| 124 | { "mod-crypt-err", "Patch error: encrypted " }, |
| 125 | { "mod-err", "Patch error: other " }, |
Jacob Erlbeck | 481da7c | 2014-06-27 10:44:46 +0200 | [diff] [blame] | 126 | { "attach-reqs", "Attach Request count " }, |
| 127 | { "attach-rejs", "Attach Reject count " }, |
| 128 | { "tlli-cache", "TLLI cache size " }, |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 129 | }; |
| 130 | |
| 131 | static const struct rate_ctr_group_desc peer_ctrg_desc = { |
| 132 | .group_name_prefix = "gbproxy.peer", |
| 133 | .group_description = "GBProxy Peer Statistics", |
| 134 | .num_ctr = ARRAY_SIZE(peer_ctr_description), |
| 135 | .ctr_desc = peer_ctr_description, |
| 136 | }; |
| 137 | |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 138 | struct { |
| 139 | int check_imsi; |
| 140 | regex_t imsi_re_comp; |
| 141 | } gbprox_global_patch_state = {0,}; |
| 142 | |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 143 | |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 144 | static void gbprox_delete_tllis(struct gbprox_peer *peer); |
| 145 | |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 146 | /* Find the gbprox_peer by its BVCI */ |
| 147 | static struct gbprox_peer *peer_by_bvci(uint16_t bvci) |
| 148 | { |
| 149 | struct gbprox_peer *peer; |
Holger Hans Peter Freyther | 5eaf1a2 | 2014-08-04 11:10:09 +0200 | [diff] [blame^] | 150 | llist_for_each_entry(peer, &gbcfg.bts_peers, list) { |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 151 | if (peer->bvci == bvci) |
| 152 | return peer; |
| 153 | } |
| 154 | return NULL; |
| 155 | } |
| 156 | |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 157 | /* Find the gbprox_peer by its NSEI */ |
Holger Hans Peter Freyther | 5eaf1a2 | 2014-08-04 11:10:09 +0200 | [diff] [blame^] | 158 | struct gbprox_peer *peer_by_nsei(uint16_t nsei) |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 159 | { |
| 160 | struct gbprox_peer *peer; |
Holger Hans Peter Freyther | 5eaf1a2 | 2014-08-04 11:10:09 +0200 | [diff] [blame^] | 161 | llist_for_each_entry(peer, &gbcfg.bts_peers, list) { |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 162 | if (peer->nsei == nsei) |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 163 | return peer; |
| 164 | } |
| 165 | return NULL; |
| 166 | } |
| 167 | |
Jacob Erlbeck | 9d7268a | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 168 | /* look-up a peer by its Routeing Area Identification (RAI) */ |
| 169 | static struct gbprox_peer *peer_by_rai(const uint8_t *ra) |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 170 | { |
| 171 | struct gbprox_peer *peer; |
Holger Hans Peter Freyther | 5eaf1a2 | 2014-08-04 11:10:09 +0200 | [diff] [blame^] | 172 | llist_for_each_entry(peer, &gbcfg.bts_peers, list) { |
Harald Welte | 8ba9d2d | 2010-05-12 00:07:29 +0200 | [diff] [blame] | 173 | if (!memcmp(peer->ra, ra, 6)) |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 174 | return peer; |
| 175 | } |
| 176 | return NULL; |
| 177 | } |
| 178 | |
Jacob Erlbeck | 9d7268a | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 179 | /* look-up a peer by its Location Area Identification (LAI) */ |
| 180 | static struct gbprox_peer *peer_by_lai(const uint8_t *la) |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 181 | { |
| 182 | struct gbprox_peer *peer; |
Holger Hans Peter Freyther | 5eaf1a2 | 2014-08-04 11:10:09 +0200 | [diff] [blame^] | 183 | llist_for_each_entry(peer, &gbcfg.bts_peers, list) { |
Harald Welte | 8ba9d2d | 2010-05-12 00:07:29 +0200 | [diff] [blame] | 184 | if (!memcmp(peer->ra, la, 5)) |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 185 | return peer; |
| 186 | } |
| 187 | return NULL; |
| 188 | } |
| 189 | |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 190 | /* look-up a peer by its Location Area Code (LAC) */ |
| 191 | static struct gbprox_peer *peer_by_lac(const uint8_t *la) |
| 192 | { |
| 193 | struct gbprox_peer *peer; |
Holger Hans Peter Freyther | 5eaf1a2 | 2014-08-04 11:10:09 +0200 | [diff] [blame^] | 194 | llist_for_each_entry(peer, &gbcfg.bts_peers, list) { |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 195 | if (!memcmp(peer->ra + 3, la + 3, 2)) |
| 196 | return peer; |
| 197 | } |
| 198 | return NULL; |
| 199 | } |
| 200 | |
| 201 | |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 202 | static int check_peer_nsei(struct gbprox_peer *peer, uint16_t nsei) |
| 203 | { |
| 204 | if (peer->nsei != nsei) { |
| 205 | LOGP(DGPRS, LOGL_NOTICE, "Peer entry doesn't match current NSEI " |
| 206 | "BVCI=%u via NSEI=%u (expected NSEI=%u)\n", |
| 207 | peer->bvci, nsei, peer->nsei); |
| 208 | rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_INV_NSEI]); |
Jacob Erlbeck | d0a9b50 | 2013-10-24 12:48:56 +0200 | [diff] [blame] | 209 | return 0; |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 210 | } |
| 211 | |
Jacob Erlbeck | d0a9b50 | 2013-10-24 12:48:56 +0200 | [diff] [blame] | 212 | return 1; |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 213 | } |
| 214 | |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 215 | static struct gbprox_peer *peer_alloc(uint16_t bvci) |
| 216 | { |
| 217 | struct gbprox_peer *peer; |
| 218 | |
| 219 | peer = talloc_zero(tall_bsc_ctx, struct gbprox_peer); |
| 220 | if (!peer) |
| 221 | return NULL; |
| 222 | |
| 223 | peer->bvci = bvci; |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 224 | peer->ctrg = rate_ctr_group_alloc(peer, &peer_ctrg_desc, bvci); |
| 225 | |
Holger Hans Peter Freyther | 5eaf1a2 | 2014-08-04 11:10:09 +0200 | [diff] [blame^] | 226 | llist_add(&peer->list, &gbcfg.bts_peers); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 227 | |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 228 | INIT_LLIST_HEAD(&peer->patch_state.enabled_tllis); |
| 229 | |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 230 | return peer; |
| 231 | } |
| 232 | |
| 233 | static void peer_free(struct gbprox_peer *peer) |
| 234 | { |
Jacob Erlbeck | b44b873 | 2013-10-23 11:24:16 +0200 | [diff] [blame] | 235 | rate_ctr_group_free(peer->ctrg); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 236 | llist_del(&peer->list); |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 237 | |
| 238 | gbprox_delete_tllis(peer); |
| 239 | |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 240 | talloc_free(peer); |
| 241 | } |
| 242 | |
Harald Welte | 3fb22d6 | 2010-05-12 18:10:25 +0000 | [diff] [blame] | 243 | /* FIXME: this needs to go to libosmocore/msgb.c */ |
| 244 | static struct msgb *msgb_copy(const struct msgb *msg, const char *name) |
| 245 | { |
Harald Welte | 14f112a | 2012-06-16 16:09:52 +0800 | [diff] [blame] | 246 | struct libgb_msgb_cb *old_cb, *new_cb; |
Harald Welte | 3fb22d6 | 2010-05-12 18:10:25 +0000 | [diff] [blame] | 247 | struct msgb *new_msg; |
| 248 | |
Holger Hans Peter Freyther | 337f4d5 | 2010-06-08 18:14:37 +0800 | [diff] [blame] | 249 | new_msg = msgb_alloc(msg->data_len, name); |
Harald Welte | 3fb22d6 | 2010-05-12 18:10:25 +0000 | [diff] [blame] | 250 | if (!new_msg) |
| 251 | return NULL; |
| 252 | |
Harald Welte | 3fb22d6 | 2010-05-12 18:10:25 +0000 | [diff] [blame] | 253 | /* copy data */ |
Holger Hans Peter Freyther | 337f4d5 | 2010-06-08 18:14:37 +0800 | [diff] [blame] | 254 | memcpy(new_msg->_data, msg->_data, new_msg->data_len); |
| 255 | |
| 256 | /* copy header */ |
| 257 | new_msg->len = msg->len; |
| 258 | new_msg->data += msg->data - msg->_data; |
| 259 | new_msg->head += msg->head - msg->_data; |
| 260 | new_msg->tail += msg->tail - msg->_data; |
| 261 | |
| 262 | new_msg->l1h = new_msg->_data + (msg->l1h - msg->_data); |
| 263 | new_msg->l2h = new_msg->_data + (msg->l2h - msg->_data); |
| 264 | new_msg->l3h = new_msg->_data + (msg->l3h - msg->_data); |
| 265 | new_msg->l4h = new_msg->_data + (msg->l4h - msg->_data); |
| 266 | |
| 267 | /* copy GB specific data */ |
Harald Welte | 14f112a | 2012-06-16 16:09:52 +0800 | [diff] [blame] | 268 | old_cb = LIBGB_MSGB_CB(msg); |
| 269 | new_cb = LIBGB_MSGB_CB(new_msg); |
Holger Hans Peter Freyther | 337f4d5 | 2010-06-08 18:14:37 +0800 | [diff] [blame] | 270 | |
| 271 | new_cb->bssgph = new_msg->_data + (old_cb->bssgph - msg->_data); |
| 272 | new_cb->llch = new_msg->_data + (old_cb->llch - msg->_data); |
| 273 | |
Harald Welte | 7b7eaa9 | 2011-02-06 17:17:05 +0100 | [diff] [blame] | 274 | /* bssgp_cell_id is a pointer into the old msgb, so we need to make |
| 275 | * it a pointer into the new msgb */ |
| 276 | new_cb->bssgp_cell_id = new_msg->_data + (old_cb->bssgp_cell_id - msg->_data); |
Holger Hans Peter Freyther | 337f4d5 | 2010-06-08 18:14:37 +0800 | [diff] [blame] | 277 | new_cb->nsei = old_cb->nsei; |
| 278 | new_cb->bvci = old_cb->bvci; |
| 279 | new_cb->tlli = old_cb->tlli; |
Harald Welte | 3fb22d6 | 2010-05-12 18:10:25 +0000 | [diff] [blame] | 280 | |
| 281 | return new_msg; |
| 282 | } |
| 283 | |
Harald Welte | 3ad3243 | 2010-05-03 19:05:10 +0200 | [diff] [blame] | 284 | /* strip off the NS header */ |
| 285 | static void strip_ns_hdr(struct msgb *msg) |
| 286 | { |
| 287 | int strip_len = msgb_bssgph(msg) - msg->data; |
| 288 | msgb_pull(msg, strip_len); |
| 289 | } |
| 290 | |
Jacob Erlbeck | 5620c6d | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 291 | /* TODO: Move this to libosmocore/msgb.c */ |
| 292 | static int msgb_resize_area(struct msgb *msg, uint8_t *area, |
| 293 | size_t old_size, size_t new_size) |
| 294 | { |
| 295 | int rc; |
| 296 | uint8_t *rest = area + old_size; |
| 297 | int rest_len = msg->len - old_size - (area - msg->data); |
| 298 | int delta_size = (int)new_size - (int)old_size; |
| 299 | |
| 300 | if (delta_size == 0) |
| 301 | return 0; |
| 302 | |
| 303 | if (delta_size > 0) { |
| 304 | rc = msgb_trim(msg, msg->len + delta_size); |
| 305 | if (rc < 0) |
| 306 | return rc; |
| 307 | } |
| 308 | |
| 309 | memmove(area + new_size, area + old_size, rest_len); |
| 310 | |
| 311 | if (msg->l1h >= rest) |
| 312 | msg->l1h += delta_size; |
| 313 | if (msg->l2h >= rest) |
| 314 | msg->l2h += delta_size; |
| 315 | if (msg->l3h >= rest) |
| 316 | msg->l3h += delta_size; |
| 317 | if (msg->l4h >= rest) |
| 318 | msg->l4h += delta_size; |
| 319 | |
| 320 | if (delta_size < 0) |
| 321 | msgb_trim(msg, msg->len + delta_size); |
| 322 | |
| 323 | return 0; |
| 324 | } |
| 325 | |
| 326 | /* TODO: Move these conversion functions to a utils file. */ |
| 327 | char * gbprox_apn_to_str(char *out_str, const uint8_t *apn_enc, size_t rest_chars) |
| 328 | { |
| 329 | char *str = out_str; |
| 330 | |
| 331 | while (rest_chars > 0 && apn_enc[0]) { |
| 332 | size_t label_size = apn_enc[0]; |
| 333 | if (label_size + 1 > rest_chars) |
| 334 | return NULL; |
| 335 | |
| 336 | memmove(str, apn_enc + 1, label_size); |
| 337 | str += label_size; |
| 338 | rest_chars -= label_size + 1; |
| 339 | apn_enc += label_size + 1; |
| 340 | |
| 341 | if (rest_chars) |
| 342 | *(str++) = '.'; |
| 343 | } |
| 344 | str[0] = '\0'; |
| 345 | |
| 346 | return out_str; |
| 347 | } |
| 348 | |
| 349 | int gbprox_str_to_apn(uint8_t *apn_enc, const char *str, size_t max_chars) |
| 350 | { |
| 351 | uint8_t *last_len_field = apn_enc; |
| 352 | int len = 1; |
| 353 | apn_enc += 1; |
| 354 | |
| 355 | while (str[0]) { |
| 356 | if (str[0] == '.') { |
| 357 | *last_len_field = (apn_enc - last_len_field) - 1; |
| 358 | last_len_field = apn_enc; |
| 359 | } else { |
| 360 | *apn_enc = str[0]; |
| 361 | } |
| 362 | apn_enc += 1; |
| 363 | str += 1; |
| 364 | len += 1; |
| 365 | if (len > max_chars) |
| 366 | return -1; |
| 367 | } |
| 368 | |
| 369 | *last_len_field = (apn_enc - last_len_field) - 1; |
| 370 | |
| 371 | return len; |
| 372 | } |
| 373 | |
Jacob Erlbeck | 077abce | 2014-07-01 12:41:13 +0200 | [diff] [blame] | 374 | /* TODO: Move shift functions to libosmocore */ |
| 375 | |
| 376 | int v_fixed_shift(uint8_t **data, size_t *data_len, |
| 377 | size_t len, uint8_t **value) |
| 378 | { |
| 379 | if (len > *data_len) |
| 380 | goto fail; |
| 381 | |
| 382 | if (value) |
| 383 | *value = *data; |
| 384 | |
| 385 | *data += len; |
| 386 | *data_len -= len; |
| 387 | |
| 388 | return len; |
| 389 | |
| 390 | fail: |
| 391 | *data += *data_len; |
| 392 | *data_len = 0; |
| 393 | return -1; |
| 394 | } |
| 395 | |
| 396 | int tv_fixed_match(uint8_t **data, size_t *data_len, |
| 397 | uint8_t tag, size_t len, |
| 398 | uint8_t **value) |
| 399 | { |
| 400 | size_t ie_len; |
| 401 | |
| 402 | if (*data_len == 0) |
| 403 | goto fail; |
| 404 | |
| 405 | if ((*data)[0] != tag) |
| 406 | return 0; |
| 407 | |
| 408 | if (len > *data_len - 1) |
| 409 | goto fail; |
| 410 | |
| 411 | if (value) |
| 412 | *value = *data + 1; |
| 413 | |
| 414 | ie_len = len + 1; |
| 415 | *data += ie_len; |
| 416 | *data_len -= ie_len; |
| 417 | |
| 418 | return ie_len; |
| 419 | |
| 420 | fail: |
| 421 | *data += *data_len; |
| 422 | *data_len = 0; |
| 423 | return -1; |
| 424 | } |
| 425 | |
| 426 | int tlv_match(uint8_t **data, size_t *data_len, |
| 427 | uint8_t tag, uint8_t **value, size_t *value_len) |
| 428 | { |
| 429 | size_t len; |
| 430 | size_t ie_len; |
| 431 | |
| 432 | if (*data_len < 2) |
| 433 | goto fail; |
| 434 | |
| 435 | if ((*data)[0] != tag) |
| 436 | return 0; |
| 437 | |
| 438 | len = (*data)[1]; |
| 439 | if (len > *data_len - 2) |
| 440 | goto fail; |
| 441 | |
| 442 | if (value) |
| 443 | *value = *data + 2; |
| 444 | if (value_len) |
| 445 | *value_len = len; |
| 446 | |
| 447 | ie_len = len + 2; |
| 448 | |
| 449 | *data += ie_len; |
| 450 | *data_len -= ie_len; |
| 451 | |
| 452 | return ie_len; |
| 453 | |
| 454 | fail: |
| 455 | *data += *data_len; |
| 456 | *data_len = 0; |
| 457 | return -1; |
| 458 | } |
| 459 | |
| 460 | int lv_shift(uint8_t **data, size_t *data_len, |
| 461 | uint8_t **value, size_t *value_len) |
| 462 | { |
| 463 | size_t len; |
| 464 | size_t ie_len; |
| 465 | |
| 466 | if (*data_len < 1) |
| 467 | goto fail; |
| 468 | |
| 469 | len = (*data)[0]; |
| 470 | if (len > *data_len - 1) |
| 471 | goto fail; |
| 472 | |
| 473 | if (value) |
| 474 | *value = *data + 1; |
| 475 | if (value_len) |
| 476 | *value_len = len; |
| 477 | |
| 478 | ie_len = len + 1; |
| 479 | *data += ie_len; |
| 480 | *data_len -= ie_len; |
| 481 | |
| 482 | return ie_len; |
| 483 | |
| 484 | fail: |
| 485 | *data += *data_len; |
| 486 | *data_len = 0; |
| 487 | return -1; |
| 488 | } |
| 489 | |
Jacob Erlbeck | f5b2085 | 2014-06-27 18:10:53 +0200 | [diff] [blame] | 490 | static int parse_mi_tmsi(uint8_t *value, size_t value_len, uint32_t *tmsi) |
| 491 | { |
| 492 | uint32_t tmsi_be; |
| 493 | |
| 494 | if (value_len != GSM48_TMSI_LEN) |
| 495 | return 0; |
| 496 | |
| 497 | if ((value[0] & 0x0f) != GSM_MI_TYPE_TMSI) |
| 498 | return 0; |
| 499 | |
| 500 | memcpy(&tmsi_be, value + 1, sizeof(tmsi_be)); |
| 501 | |
| 502 | *tmsi = ntohl(tmsi_be); |
| 503 | |
| 504 | return 1; |
| 505 | } |
| 506 | |
Jacob Erlbeck | f40a6c9 | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 507 | struct gbprox_parse_context { |
| 508 | /* Pointer to protocol specific parts */ |
| 509 | struct gsm48_hdr *g48_hdr; |
| 510 | struct gprs_llc_hdr_parsed *llc_hdr_parsed; |
| 511 | struct tlv_parsed *bssgp_tp; |
| 512 | struct bssgp_ud_hdr *bud_hdr; |
| 513 | |
| 514 | /* Extracted information */ |
| 515 | int to_bss; |
| 516 | uint32_t tlli; |
| 517 | const uint8_t *imsi; |
| 518 | size_t imsi_len; |
| 519 | uint32_t new_ptmsi; |
| 520 | }; |
| 521 | |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 522 | static struct gbprox_tlli_info *gbprox_find_tlli(struct gbprox_peer *peer, |
| 523 | uint32_t tlli) |
| 524 | { |
| 525 | struct gbprox_tlli_info *tlli_info; |
| 526 | struct gbprox_patch_state *state = &peer->patch_state; |
| 527 | |
| 528 | llist_for_each_entry(tlli_info, &state->enabled_tllis, list) |
| 529 | if (tlli_info->tlli == tlli) |
| 530 | return tlli_info; |
| 531 | |
| 532 | return NULL; |
| 533 | } |
| 534 | |
| 535 | static struct gbprox_tlli_info *gbprox_find_tlli_by_mi( |
| 536 | struct gbprox_peer *peer, |
| 537 | const uint8_t *mi_data, |
| 538 | size_t mi_data_len) |
| 539 | { |
| 540 | struct gbprox_tlli_info *tlli_info; |
| 541 | struct gbprox_patch_state *state = &peer->patch_state; |
| 542 | |
| 543 | llist_for_each_entry(tlli_info, &state->enabled_tllis, list) { |
| 544 | if (tlli_info->mi_data_len != mi_data_len) |
| 545 | continue; |
| 546 | if (memcmp(tlli_info->mi_data, mi_data, mi_data_len) != 0) |
| 547 | continue; |
| 548 | |
| 549 | return tlli_info; |
| 550 | } |
| 551 | |
| 552 | return NULL; |
| 553 | } |
| 554 | |
Holger Hans Peter Freyther | 5eaf1a2 | 2014-08-04 11:10:09 +0200 | [diff] [blame^] | 555 | void gbprox_delete_tlli(struct gbprox_peer *peer, |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 556 | struct gbprox_tlli_info *tlli_info) |
| 557 | { |
| 558 | struct gbprox_patch_state *state = &peer->patch_state; |
| 559 | |
| 560 | llist_del(&tlli_info->list); |
| 561 | talloc_free(tlli_info); |
| 562 | state->enabled_tllis_count -= 1; |
| 563 | } |
| 564 | |
| 565 | static void gbprox_delete_tllis(struct gbprox_peer *peer) |
| 566 | { |
| 567 | struct gbprox_tlli_info *tlli_info, *nxt; |
| 568 | struct gbprox_patch_state *state = &peer->patch_state; |
| 569 | |
| 570 | llist_for_each_entry_safe(tlli_info, nxt, &state->enabled_tllis, list) { |
| 571 | llist_del(&tlli_info->list); |
| 572 | talloc_free(tlli_info); |
| 573 | } |
Jacob Erlbeck | d77af10 | 2014-06-27 12:20:44 +0200 | [diff] [blame] | 574 | state->enabled_tllis_count = 0; |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 575 | |
| 576 | OSMO_ASSERT(llist_empty(&state->enabled_tllis)); |
| 577 | } |
| 578 | |
| 579 | int gbprox_set_patch_filter(const char *filter, const char **err_msg) |
| 580 | { |
| 581 | static char err_buf[300]; |
| 582 | int rc; |
| 583 | |
| 584 | if (gbprox_global_patch_state.check_imsi) { |
| 585 | regfree(&gbprox_global_patch_state.imsi_re_comp); |
| 586 | gbprox_global_patch_state.check_imsi = 0; |
| 587 | } |
| 588 | |
| 589 | if (!filter) |
| 590 | return 0; |
| 591 | |
| 592 | rc = regcomp(&gbprox_global_patch_state.imsi_re_comp, filter, |
| 593 | REG_EXTENDED | REG_NOSUB | REG_ICASE); |
| 594 | |
| 595 | if (rc == 0) { |
| 596 | gbprox_global_patch_state.check_imsi = 1; |
| 597 | return 0; |
| 598 | } |
| 599 | |
| 600 | if (err_msg) { |
| 601 | regerror(rc, &gbprox_global_patch_state.imsi_re_comp, |
| 602 | err_buf, sizeof(err_buf)); |
| 603 | *err_msg = err_buf; |
| 604 | } |
| 605 | |
| 606 | return -1; |
| 607 | } |
| 608 | |
| 609 | static int gbprox_check_imsi(struct gbprox_peer *peer, |
| 610 | const uint8_t *imsi, size_t imsi_len) |
| 611 | { |
| 612 | char mi_buf[200]; |
| 613 | int rc; |
| 614 | |
| 615 | if (!gbprox_global_patch_state.check_imsi) |
| 616 | return 1; |
| 617 | |
| 618 | rc = gsm48_mi_to_string(mi_buf, sizeof(mi_buf), imsi, imsi_len); |
| 619 | if (rc < 1) { |
| 620 | LOGP(DGPRS, LOGL_NOTICE, "Invalid IMSI %s\n", |
| 621 | osmo_hexdump(imsi, imsi_len)); |
| 622 | return -1; |
| 623 | } |
| 624 | |
| 625 | LOGP(DGPRS, LOGL_DEBUG, "Checking IMSI '%s' (%d)\n", mi_buf, rc); |
| 626 | |
| 627 | rc = regexec(&gbprox_global_patch_state.imsi_re_comp, mi_buf, 0, NULL, 0); |
| 628 | if (rc == REG_NOMATCH) { |
| 629 | LOGP(DGPRS, LOGL_INFO, |
| 630 | "IMSI '%s' doesn't match pattern '%s'\n", |
| 631 | mi_buf, gbcfg.match_re); |
| 632 | return 0; |
| 633 | } |
| 634 | |
| 635 | return 1; |
| 636 | } |
| 637 | |
Holger Hans Peter Freyther | 5eaf1a2 | 2014-08-04 11:10:09 +0200 | [diff] [blame^] | 638 | int gbprox_remove_stale_ttlis(struct gbprox_peer *peer, time_t now) |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 639 | { |
| 640 | struct gbprox_patch_state *state = &peer->patch_state; |
| 641 | struct gbprox_tlli_info *tlli_info = NULL, *nxt; |
| 642 | int count = 0; |
| 643 | int deleted_count = 0; |
| 644 | |
| 645 | llist_for_each_entry_safe(tlli_info, nxt, &state->enabled_tllis, list) { |
| 646 | int is_stale = 0; |
| 647 | time_t age = now - tlli_info->timestamp; |
| 648 | |
| 649 | count += 1; |
| 650 | |
| 651 | if (gbcfg.tlli_max_len > 0) |
| 652 | is_stale = is_stale || count > gbcfg.tlli_max_len; |
| 653 | |
| 654 | if (gbcfg.tlli_max_age > 0) |
| 655 | is_stale = is_stale || age > gbcfg.tlli_max_age; |
| 656 | |
| 657 | if (!is_stale) |
| 658 | continue; |
| 659 | |
| 660 | LOGP(DGPRS, LOGL_INFO, |
| 661 | "Removing TLLI %08x from list (stale)\n", |
| 662 | tlli_info->tlli); |
| 663 | |
| 664 | gbprox_delete_tlli(peer, tlli_info); |
| 665 | tlli_info = NULL; |
| 666 | |
| 667 | deleted_count += 1; |
| 668 | } |
| 669 | |
| 670 | return deleted_count; |
| 671 | } |
| 672 | |
| 673 | static void gbprox_register_tlli(struct gbprox_peer *peer, uint32_t tlli, |
| 674 | const uint8_t *imsi, size_t imsi_len) |
| 675 | { |
| 676 | struct gbprox_patch_state *state = &peer->patch_state; |
| 677 | struct gbprox_tlli_info *tlli_info; |
| 678 | int enable_patching; |
| 679 | time_t now = 0; |
| 680 | |
| 681 | if (gprs_tlli_type(tlli) != TLLI_LOCAL) |
| 682 | return; |
| 683 | |
| 684 | if (!imsi || (imsi[0] & GSM_MI_TYPE_MASK) != GSM_MI_TYPE_IMSI) |
| 685 | return; |
| 686 | |
| 687 | if (!gbprox_global_patch_state.check_imsi) |
| 688 | return; |
| 689 | |
| 690 | tlli_info = gbprox_find_tlli(peer, tlli); |
| 691 | |
| 692 | /* Check, whether the IMSI matches */ |
| 693 | enable_patching = gbprox_check_imsi(peer, imsi, imsi_len); |
| 694 | |
| 695 | if (enable_patching < 0) |
| 696 | return; |
| 697 | |
| 698 | if (!tlli_info) { |
| 699 | tlli_info = gbprox_find_tlli_by_mi(peer, imsi, imsi_len); |
| 700 | |
| 701 | if (tlli_info) { |
| 702 | /* TLLI has changed somehow, adjust it */ |
| 703 | LOGP(DGPRS, LOGL_INFO, |
| 704 | "The TLLI has changed from %08x to %08x\n", |
| 705 | tlli_info->tlli, tlli); |
| 706 | tlli_info->tlli = tlli; |
| 707 | } |
| 708 | } |
| 709 | |
| 710 | if (!tlli_info) { |
| 711 | if (!enable_patching) |
| 712 | return; |
| 713 | |
| 714 | LOGP(DGPRS, LOGL_INFO, "Adding TLLI %08x to list\n", tlli); |
| 715 | tlli_info = talloc_zero(peer, struct gbprox_tlli_info); |
| 716 | tlli_info->tlli = tlli; |
| 717 | } else { |
| 718 | llist_del(&tlli_info->list); |
| 719 | OSMO_ASSERT(state->enabled_tllis_count > 0); |
| 720 | state->enabled_tllis_count -= 1; |
| 721 | } |
| 722 | |
| 723 | OSMO_ASSERT(tlli_info != NULL); |
| 724 | |
| 725 | if (enable_patching) { |
| 726 | now = time(NULL); |
| 727 | |
| 728 | tlli_info->timestamp = now; |
| 729 | llist_add(&tlli_info->list, &state->enabled_tllis); |
| 730 | state->enabled_tllis_count += 1; |
| 731 | |
| 732 | gbprox_remove_stale_ttlis(peer, now); |
| 733 | |
| 734 | if (tlli_info != llist_entry(state->enabled_tllis.next, |
| 735 | struct gbprox_tlli_info, list)) { |
| 736 | LOGP(DGPRS, LOGL_ERROR, |
| 737 | "Unexpectedly removed new TLLI entry as stale, " |
| 738 | "TLLI %08x\n", tlli); |
| 739 | tlli_info = NULL; |
| 740 | } |
| 741 | } else { |
| 742 | LOGP(DGPRS, LOGL_INFO, |
| 743 | "Removing TLLI %08x from list (patching no longer enabled)\n", |
| 744 | tlli); |
| 745 | talloc_free(tlli_info); |
| 746 | tlli_info = NULL; |
| 747 | } |
| 748 | |
| 749 | if (tlli_info) { |
| 750 | tlli_info->mi_data_len = imsi_len; |
| 751 | tlli_info->mi_data = |
| 752 | talloc_realloc_size(tlli_info, tlli_info->mi_data, imsi_len); |
| 753 | OSMO_ASSERT(tlli_info->mi_data != NULL); |
| 754 | memcpy(tlli_info->mi_data, imsi, imsi_len); |
| 755 | } |
Jacob Erlbeck | 481da7c | 2014-06-27 10:44:46 +0200 | [diff] [blame] | 756 | |
Jacob Erlbeck | 481da7c | 2014-06-27 10:44:46 +0200 | [diff] [blame] | 757 | peer->ctrg->ctr[GBPROX_PEER_CTR_TLLI_CACHE_SIZE].current = |
| 758 | state->enabled_tllis_count; |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 759 | } |
| 760 | |
| 761 | static void gbprox_unregister_tlli(struct gbprox_peer *peer, uint32_t tlli) |
| 762 | { |
| 763 | struct gbprox_tlli_info *tlli_info; |
Jacob Erlbeck | d77af10 | 2014-06-27 12:20:44 +0200 | [diff] [blame] | 764 | struct gbprox_patch_state *state = &peer->patch_state; |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 765 | |
| 766 | tlli_info = gbprox_find_tlli(peer, tlli); |
| 767 | if (tlli_info) { |
| 768 | LOGP(DGPRS, LOGL_INFO, |
| 769 | "Removing TLLI %08x from list\n", |
| 770 | tlli); |
| 771 | llist_del(&tlli_info->list); |
| 772 | talloc_free(tlli_info); |
Jacob Erlbeck | d77af10 | 2014-06-27 12:20:44 +0200 | [diff] [blame] | 773 | state->enabled_tllis_count -= 1; |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 774 | } |
Jacob Erlbeck | d77af10 | 2014-06-27 12:20:44 +0200 | [diff] [blame] | 775 | |
| 776 | peer->ctrg->ctr[GBPROX_PEER_CTR_TLLI_CACHE_SIZE].current = |
| 777 | state->enabled_tllis_count; |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 778 | } |
| 779 | |
| 780 | static int gbprox_check_tlli(struct gbprox_peer *peer, uint32_t tlli) |
| 781 | { |
| 782 | LOGP(DGPRS, LOGL_INFO, "Checking TLLI %08x, class: %d\n", |
| 783 | tlli, gprs_tlli_type(tlli)); |
| 784 | if (gprs_tlli_type(tlli) != TLLI_LOCAL) |
| 785 | return 0; |
| 786 | |
| 787 | return !gbprox_global_patch_state.check_imsi || |
| 788 | gbprox_find_tlli(peer, tlli) != NULL; |
| 789 | } |
| 790 | |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 791 | /* check whether patching is enabled at this level */ |
| 792 | static int patching_is_enabled(enum gbproxy_patch_mode need_at_least) |
| 793 | { |
| 794 | enum gbproxy_patch_mode patch_mode = gbcfg.patch_mode; |
| 795 | if (patch_mode == GBPROX_PATCH_DEFAULT) |
| 796 | patch_mode = GBPROX_PATCH_LLC; |
| 797 | |
| 798 | return need_at_least <= patch_mode; |
| 799 | } |
| 800 | |
| 801 | /* check whether patching is enabled at this level */ |
| 802 | static int patching_is_required(enum gbproxy_patch_mode need_at_least) |
| 803 | { |
| 804 | return need_at_least <= gbcfg.patch_mode; |
| 805 | } |
| 806 | |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 807 | /* patch RA identifier in place, update peer accordingly */ |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 808 | static void gbprox_patch_raid(uint8_t *raid_enc, struct gbprox_peer *peer, |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 809 | int to_bss, const char *log_text) |
| 810 | { |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 811 | struct gbprox_patch_state *state = &peer->patch_state; |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 812 | const int old_local_mcc = state->local_mcc; |
| 813 | const int old_local_mnc = state->local_mnc; |
| 814 | int old_mcc; |
| 815 | int old_mnc; |
| 816 | struct gprs_ra_id raid; |
| 817 | |
| 818 | gsm48_parse_ra(&raid, raid_enc); |
| 819 | |
| 820 | old_mcc = raid.mcc; |
| 821 | old_mnc = raid.mnc; |
| 822 | |
| 823 | if (!to_bss) { |
| 824 | /* BSS -> SGSN */ |
| 825 | /* save BSS side MCC/MNC */ |
| 826 | if (!gbcfg.core_mcc || raid.mcc == gbcfg.core_mcc) { |
| 827 | state->local_mcc = 0; |
| 828 | } else { |
| 829 | state->local_mcc = raid.mcc; |
| 830 | raid.mcc = gbcfg.core_mcc; |
| 831 | } |
| 832 | |
| 833 | if (!gbcfg.core_mnc || raid.mnc == gbcfg.core_mnc) { |
| 834 | state->local_mnc = 0; |
| 835 | } else { |
| 836 | state->local_mnc = raid.mnc; |
| 837 | raid.mnc = gbcfg.core_mnc; |
| 838 | } |
| 839 | } else { |
| 840 | /* SGSN -> BSS */ |
| 841 | if (state->local_mcc) |
| 842 | raid.mcc = state->local_mcc; |
| 843 | |
| 844 | if (state->local_mnc) |
| 845 | raid.mnc = state->local_mnc; |
| 846 | } |
| 847 | |
| 848 | if (old_local_mcc != state->local_mcc || |
| 849 | old_local_mnc != state->local_mnc) |
| 850 | LOGP(DGPRS, LOGL_NOTICE, |
| 851 | "Patching RAID %sactivated, msg: %s, " |
| 852 | "local: %d-%d, core: %d-%d, to %s\n", |
| 853 | state->local_mcc || state->local_mnc ? |
| 854 | "" : "de", |
| 855 | log_text, |
| 856 | state->local_mcc, state->local_mnc, |
| 857 | gbcfg.core_mcc, gbcfg.core_mnc, |
| 858 | to_bss ? "BSS" : "SGSN"); |
| 859 | |
| 860 | if (state->local_mcc || state->local_mnc) { |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 861 | enum gbprox_peer_ctr counter = |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 862 | to_bss ? |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 863 | GBPROX_PEER_CTR_RAID_PATCHED_SGSN : |
| 864 | GBPROX_PEER_CTR_RAID_PATCHED_BSS; |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 865 | |
| 866 | LOGP(DGPRS, LOGL_DEBUG, |
| 867 | "Patching %s to %s: " |
| 868 | "%d-%d-%d-%d -> %d-%d-%d-%d\n", |
| 869 | log_text, |
| 870 | to_bss ? "BSS" : "SGSN", |
| 871 | old_mcc, old_mnc, raid.lac, raid.rac, |
| 872 | raid.mcc, raid.mnc, raid.lac, raid.rac); |
| 873 | |
| 874 | gsm48_construct_ra(raid_enc, &raid); |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 875 | rate_ctr_inc(&peer->ctrg->ctr[counter]); |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 876 | } |
| 877 | } |
| 878 | |
Jacob Erlbeck | 5620c6d | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 879 | static void gbprox_patch_apn_ie(struct msgb *msg, |
| 880 | uint8_t *apn_ie, size_t apn_ie_len, |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 881 | struct gbprox_peer *peer, |
Jacob Erlbeck | 5620c6d | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 882 | size_t *new_apn_ie_len, const char *log_text) |
| 883 | { |
| 884 | struct apn_ie_hdr { |
| 885 | uint8_t iei; |
| 886 | uint8_t apn_len; |
| 887 | uint8_t apn[0]; |
| 888 | } *hdr = (void *)apn_ie; |
| 889 | |
| 890 | size_t apn_len = hdr->apn_len; |
| 891 | uint8_t *apn = hdr->apn; |
| 892 | |
| 893 | OSMO_ASSERT(apn_ie_len == apn_len + sizeof(struct apn_ie_hdr)); |
| 894 | OSMO_ASSERT(apn_ie_len > 2 && apn_ie_len <= 102); |
| 895 | |
| 896 | if (gbcfg.core_apn_size == 0) { |
| 897 | char str1[110]; |
| 898 | /* Remove the IE */ |
| 899 | LOGP(DGPRS, LOGL_DEBUG, |
| 900 | "Patching %s to SGSN: Removing APN '%s'\n", |
| 901 | log_text, |
| 902 | gbprox_apn_to_str(str1, apn, apn_len)); |
| 903 | |
| 904 | *new_apn_ie_len = 0; |
| 905 | msgb_resize_area(msg, apn_ie, apn_ie_len, 0); |
| 906 | } else { |
| 907 | /* Resize the IE */ |
| 908 | char str1[110]; |
| 909 | char str2[110]; |
| 910 | |
| 911 | OSMO_ASSERT(gbcfg.core_apn_size <= 100); |
| 912 | |
| 913 | LOGP(DGPRS, LOGL_DEBUG, |
| 914 | "Patching %s to SGSN: " |
| 915 | "Replacing APN '%s' -> '%s'\n", |
| 916 | log_text, |
| 917 | gbprox_apn_to_str(str1, apn, apn_len), |
| 918 | gbprox_apn_to_str(str2, gbcfg.core_apn, |
| 919 | gbcfg.core_apn_size)); |
| 920 | |
| 921 | *new_apn_ie_len = gbcfg.core_apn_size + 2; |
| 922 | msgb_resize_area(msg, apn, apn_len, gbcfg.core_apn_size); |
| 923 | memcpy(apn, gbcfg.core_apn, gbcfg.core_apn_size); |
| 924 | hdr->apn_len = gbcfg.core_apn_size; |
| 925 | } |
| 926 | |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 927 | rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_APN_PATCHED]); |
Jacob Erlbeck | 5620c6d | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 928 | } |
| 929 | |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 930 | static int gbprox_patch_gmm_attach_req(struct msgb *msg, |
| 931 | uint8_t *data, size_t data_len, |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 932 | struct gbprox_peer *peer, |
Jacob Erlbeck | f40a6c9 | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 933 | int *len_change, |
| 934 | struct gbprox_parse_context *parse_ctx) |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 935 | { |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 936 | uint8_t *value; |
| 937 | size_t value_len; |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 938 | |
| 939 | /* Skip MS network capability */ |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 940 | if (lv_shift(&data, &data_len, NULL, &value_len) <= 0 || |
| 941 | value_len < 1 || value_len > 2) |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 942 | /* invalid */ |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 943 | return 0;; |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 944 | |
| 945 | /* Skip Attach type */ |
| 946 | /* Skip Ciphering key sequence number */ |
| 947 | /* Skip DRX parameter */ |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 948 | v_fixed_shift(&data, &data_len, 3, NULL); |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 949 | |
| 950 | /* Skip Mobile identity */ |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 951 | if (lv_shift(&data, &data_len, NULL, &value_len) <= 0 || |
| 952 | value_len < 5 || value_len > 8) |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 953 | /* invalid */ |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 954 | return 0;; |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 955 | |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 956 | if (v_fixed_shift(&data, &data_len, 6, &value) <= 0) |
| 957 | return 0; |
| 958 | |
Jacob Erlbeck | f40a6c9 | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 959 | gbprox_patch_raid(value, peer, parse_ctx->to_bss, "LLC/ATTACH_REQ"); |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 960 | |
| 961 | return 1; |
| 962 | } |
| 963 | |
| 964 | static int gbprox_patch_gmm_attach_ack(struct msgb *msg, |
| 965 | uint8_t *data, size_t data_len, |
Jacob Erlbeck | f40a6c9 | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 966 | struct gbprox_peer *peer, int *len_change, |
| 967 | struct gbprox_parse_context *parse_ctx) |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 968 | { |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 969 | uint8_t *value; |
Jacob Erlbeck | f5b2085 | 2014-06-27 18:10:53 +0200 | [diff] [blame] | 970 | size_t value_len; |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 971 | |
| 972 | /* Skip Attach result */ |
| 973 | /* Skip Force to standby */ |
| 974 | /* Skip Periodic RA update timer */ |
| 975 | /* Skip Radio priority for SMS */ |
| 976 | /* Skip Spare half octet */ |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 977 | v_fixed_shift(&data, &data_len, 3, NULL); |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 978 | |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 979 | if (v_fixed_shift(&data, &data_len, 6, &value) <= 0) |
| 980 | return 0; |
| 981 | |
Jacob Erlbeck | f40a6c9 | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 982 | gbprox_patch_raid(value, peer, parse_ctx->to_bss, "LLC/ATTACH_ACK"); |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 983 | |
Jacob Erlbeck | f5b2085 | 2014-06-27 18:10:53 +0200 | [diff] [blame] | 984 | /* Skip P-TMSI signature (P-TMSI signature, opt, TV, length 4) */ |
| 985 | tv_fixed_match(&data, &data_len, GSM48_IE_GMM_PTMSI_SIG, 3, NULL); |
| 986 | |
| 987 | /* Skip Negotiated READY timer value (GPRS timer, opt, TV, length 2) */ |
| 988 | tv_fixed_match(&data, &data_len, GSM48_IE_GMM_TIMER_READY, 1, NULL); |
| 989 | |
| 990 | /* Allocated P-TMSI (Mobile identity, opt, TLV, length 7) */ |
| 991 | if (tlv_match(&data, &data_len, GSM48_IE_GMM_ALLOC_PTMSI, |
| 992 | &value, &value_len) > 0) |
| 993 | parse_mi_tmsi(value, value_len, &parse_ctx->new_ptmsi); |
| 994 | |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 995 | return 1; |
| 996 | } |
| 997 | |
| 998 | static int gbprox_patch_gmm_ra_upd_req(struct msgb *msg, |
| 999 | uint8_t *data, size_t data_len, |
Jacob Erlbeck | f40a6c9 | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 1000 | struct gbprox_peer *peer, int *len_change, |
| 1001 | struct gbprox_parse_context *parse_ctx) |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1002 | { |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 1003 | uint8_t *value; |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1004 | |
| 1005 | /* Skip Update type */ |
| 1006 | /* Skip GPRS ciphering key sequence number */ |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 1007 | v_fixed_shift(&data, &data_len, 1, NULL); |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1008 | |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 1009 | if (v_fixed_shift(&data, &data_len, 6, &value) <= 0) |
| 1010 | return 0; |
| 1011 | |
Jacob Erlbeck | f40a6c9 | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 1012 | gbprox_patch_raid(value, peer, parse_ctx->to_bss, "LLC/RA_UPD_REQ"); |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1013 | |
| 1014 | return 1; |
| 1015 | } |
| 1016 | |
| 1017 | static int gbprox_patch_gmm_ra_upd_ack(struct msgb *msg, |
| 1018 | uint8_t *data, size_t data_len, |
Jacob Erlbeck | f40a6c9 | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 1019 | struct gbprox_peer *peer, int *len_change, |
| 1020 | struct gbprox_parse_context *parse_ctx) |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1021 | { |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 1022 | uint8_t *value; |
Jacob Erlbeck | f5b2085 | 2014-06-27 18:10:53 +0200 | [diff] [blame] | 1023 | size_t value_len; |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1024 | |
| 1025 | /* Skip Force to standby */ |
| 1026 | /* Skip Update result */ |
| 1027 | /* Skip Periodic RA update timer */ |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 1028 | v_fixed_shift(&data, &data_len, 2, NULL); |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1029 | |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 1030 | if (v_fixed_shift(&data, &data_len, 6, &value) <= 0) |
| 1031 | return 0; |
| 1032 | |
Jacob Erlbeck | f40a6c9 | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 1033 | gbprox_patch_raid(value, peer, parse_ctx->to_bss, "LLC/RA_UPD_ACK"); |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 1034 | |
Jacob Erlbeck | f5b2085 | 2014-06-27 18:10:53 +0200 | [diff] [blame] | 1035 | /* Skip P-TMSI signature (P-TMSI signature, opt, TV, length 4) */ |
| 1036 | tv_fixed_match(&data, &data_len, GSM48_IE_GMM_PTMSI_SIG, 3, NULL); |
| 1037 | |
| 1038 | /* Allocated P-TMSI (Mobile identity, opt, TLV, length 7) */ |
| 1039 | if (tlv_match(&data, &data_len, GSM48_IE_GMM_ALLOC_PTMSI, |
| 1040 | &value, &value_len) > 0) |
| 1041 | parse_mi_tmsi(value, value_len, &parse_ctx->new_ptmsi); |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1042 | |
| 1043 | return 1; |
| 1044 | } |
| 1045 | |
| 1046 | static int gbprox_patch_gmm_ptmsi_reall_cmd(struct msgb *msg, |
| 1047 | uint8_t *data, size_t data_len, |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 1048 | struct gbprox_peer *peer, |
Jacob Erlbeck | f40a6c9 | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 1049 | int *len_change, |
| 1050 | struct gbprox_parse_context *parse_ctx) |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1051 | { |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 1052 | uint8_t *value; |
| 1053 | size_t value_len; |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1054 | |
Jacob Erlbeck | f5b2085 | 2014-06-27 18:10:53 +0200 | [diff] [blame] | 1055 | LOGP(DLLC, LOGL_NOTICE, |
| 1056 | "Got P-TMSI Reallocation Command which is not covered by unit tests yet.\n"); |
| 1057 | |
| 1058 | /* Allocated P-TMSI */ |
| 1059 | if (lv_shift(&data, &data_len, &value, &value_len) > 0 && |
| 1060 | parse_mi_tmsi(value, value_len, &parse_ctx->new_ptmsi) < 0) |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1061 | /* invalid */ |
| 1062 | return 0; |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1063 | |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 1064 | if (v_fixed_shift(&data, &data_len, 6, &value) <= 0) |
| 1065 | return 0; |
| 1066 | |
Jacob Erlbeck | f40a6c9 | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 1067 | gbprox_patch_raid(value, peer, parse_ctx->to_bss, "LLC/PTMSI_REALL_CMD"); |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1068 | |
| 1069 | return 1; |
| 1070 | } |
| 1071 | |
Jacob Erlbeck | 5620c6d | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 1072 | static int gbprox_patch_gsm_act_pdp_req(struct msgb *msg, |
| 1073 | uint8_t *data, size_t data_len, |
Jacob Erlbeck | f40a6c9 | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 1074 | struct gbprox_peer *peer, int *len_change, |
| 1075 | struct gbprox_parse_context *parse_ctx) |
Jacob Erlbeck | 5620c6d | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 1076 | { |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 1077 | size_t new_len; |
| 1078 | ssize_t old_len; |
| 1079 | uint8_t *value; |
| 1080 | size_t value_len; |
| 1081 | int have_patched = 0; |
Jacob Erlbeck | 5620c6d | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 1082 | |
| 1083 | /* Skip Requested NSAPI */ |
| 1084 | /* Skip Requested LLC SAPI */ |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 1085 | v_fixed_shift(&data, &data_len, 2, NULL); |
Jacob Erlbeck | 5620c6d | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 1086 | |
| 1087 | /* Skip Requested QoS (support 04.08 and 24.008) */ |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 1088 | if (lv_shift(&data, &data_len, NULL, &value_len) <= 0 || |
| 1089 | value_len < 4 || value_len > 14) |
Jacob Erlbeck | 5620c6d | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 1090 | /* invalid */ |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 1091 | return 0;; |
Jacob Erlbeck | 5620c6d | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 1092 | |
| 1093 | /* Skip Requested PDP address */ |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 1094 | if (lv_shift(&data, &data_len, NULL, &value_len) <= 0 || |
| 1095 | value_len < 2 || value_len > 18) |
Jacob Erlbeck | 5620c6d | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 1096 | /* invalid */ |
| 1097 | return 0; |
Jacob Erlbeck | 5620c6d | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 1098 | |
| 1099 | /* Access point name */ |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 1100 | old_len = tlv_match(&data, &data_len, |
| 1101 | GSM48_IE_GSM_APN, &value, &value_len); |
Jacob Erlbeck | 5620c6d | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 1102 | |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 1103 | if (old_len > 0 && value_len >=1 && value_len <= 100) { |
| 1104 | gbprox_patch_apn_ie(msg, data - old_len, old_len, peer, |
| 1105 | &new_len, "LLC/ACT_PDP_REQ"); |
| 1106 | *len_change += (int)new_len - (int)old_len; |
| 1107 | data += *len_change; |
Jacob Erlbeck | 5620c6d | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 1108 | |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 1109 | have_patched = 1; |
| 1110 | } |
Jacob Erlbeck | 5620c6d | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 1111 | |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 1112 | return have_patched; |
Jacob Erlbeck | 5620c6d | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 1113 | } |
| 1114 | |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 1115 | struct gbprox_peer *peer_by_bssgp_tlv(struct tlv_parsed *tp) |
| 1116 | { |
| 1117 | if (TLVP_PRESENT(tp, BSSGP_IE_BVCI)) { |
| 1118 | uint16_t bvci; |
| 1119 | |
| 1120 | bvci = ntohs(tlvp_val16_unal(tp, BSSGP_IE_BVCI)); |
| 1121 | if (bvci >= 2) |
| 1122 | return peer_by_bvci(bvci); |
| 1123 | } |
| 1124 | |
| 1125 | if (TLVP_PRESENT(tp, BSSGP_IE_ROUTEING_AREA)) { |
| 1126 | uint8_t *rai = (uint8_t *)TLVP_VAL(tp, BSSGP_IE_ROUTEING_AREA); |
| 1127 | /* Only compare LAC part, since MCC/MNC are possibly patched. |
| 1128 | * Since the LAC of different BSS must be different when |
| 1129 | * MCC/MNC are patched, collisions shouldn't happen. */ |
| 1130 | return peer_by_lac(rai); |
| 1131 | } |
| 1132 | |
| 1133 | if (TLVP_PRESENT(tp, BSSGP_IE_LOCATION_AREA)) { |
| 1134 | uint8_t *lai = (uint8_t *)TLVP_VAL(tp, BSSGP_IE_LOCATION_AREA); |
| 1135 | return peer_by_lac(lai); |
| 1136 | } |
| 1137 | |
| 1138 | return NULL; |
| 1139 | } |
| 1140 | |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1141 | static int gbprox_patch_dtap(struct msgb *msg, uint8_t *data, size_t data_len, |
Jacob Erlbeck | f40a6c9 | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 1142 | struct gbprox_peer *peer, int *len_change, |
| 1143 | struct gbprox_parse_context *parse_ctx) |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1144 | { |
| 1145 | struct gsm48_hdr *g48h; |
| 1146 | |
| 1147 | *len_change = 0; |
| 1148 | |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 1149 | if (v_fixed_shift(&data, &data_len, sizeof(*g48h), (uint8_t **)&g48h) <= 0) |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1150 | return 0; |
| 1151 | |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1152 | if ((g48h->proto_discr & 0x0f) != GSM48_PDISC_MM_GPRS && |
| 1153 | (g48h->proto_discr & 0x0f) != GSM48_PDISC_SM_GPRS) |
| 1154 | return 0; |
| 1155 | |
| 1156 | switch (g48h->msg_type) { |
| 1157 | case GSM48_MT_GMM_ATTACH_REQ: |
Jacob Erlbeck | 481da7c | 2014-06-27 10:44:46 +0200 | [diff] [blame] | 1158 | rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_ATTACH_REQS]); |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1159 | return gbprox_patch_gmm_attach_req(msg, data, data_len, |
Jacob Erlbeck | f40a6c9 | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 1160 | peer, len_change, parse_ctx); |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1161 | |
| 1162 | case GSM48_MT_GMM_ATTACH_ACK: |
| 1163 | if (!patching_is_enabled(GBPROX_PATCH_LLC_ATTACH)) |
| 1164 | break; |
| 1165 | return gbprox_patch_gmm_attach_ack(msg, data, data_len, |
Jacob Erlbeck | f40a6c9 | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 1166 | peer, len_change, parse_ctx); |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1167 | |
Jacob Erlbeck | 481da7c | 2014-06-27 10:44:46 +0200 | [diff] [blame] | 1168 | case GSM48_MT_GMM_ATTACH_REJ: |
| 1169 | rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_ATTACH_REJS]); |
| 1170 | break; |
| 1171 | |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1172 | case GSM48_MT_GMM_RA_UPD_REQ: |
| 1173 | if (!patching_is_enabled(GBPROX_PATCH_LLC_GMM)) |
| 1174 | break; |
| 1175 | return gbprox_patch_gmm_ra_upd_req(msg, data, data_len, |
Jacob Erlbeck | f40a6c9 | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 1176 | peer, len_change, parse_ctx); |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1177 | |
| 1178 | case GSM48_MT_GMM_RA_UPD_ACK: |
| 1179 | if (!patching_is_enabled(GBPROX_PATCH_LLC_GMM)) |
| 1180 | break; |
| 1181 | return gbprox_patch_gmm_ra_upd_ack(msg, data, data_len, |
Jacob Erlbeck | f40a6c9 | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 1182 | peer, len_change, parse_ctx); |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1183 | |
| 1184 | case GSM48_MT_GMM_PTMSI_REALL_CMD: |
| 1185 | if (!patching_is_enabled(GBPROX_PATCH_LLC_GMM)) |
| 1186 | break; |
| 1187 | return gbprox_patch_gmm_ptmsi_reall_cmd(msg, data, data_len, |
Jacob Erlbeck | f40a6c9 | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 1188 | peer, len_change, |
| 1189 | parse_ctx); |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1190 | |
Jacob Erlbeck | 5620c6d | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 1191 | case GSM48_MT_GSM_ACT_PDP_REQ: |
| 1192 | if (!patching_is_enabled(GBPROX_PATCH_LLC_GSM)) |
| 1193 | break; |
| 1194 | if (gbcfg.core_apn == NULL) |
| 1195 | break; |
Jacob Erlbeck | f40a6c9 | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 1196 | if (!gbprox_check_tlli(peer, parse_ctx->tlli)) |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 1197 | break; |
Jacob Erlbeck | 5620c6d | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 1198 | return gbprox_patch_gsm_act_pdp_req(msg, data, data_len, |
Jacob Erlbeck | f40a6c9 | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 1199 | peer, len_change, parse_ctx); |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 1200 | |
| 1201 | case GSM48_MT_GMM_DETACH_ACK: |
| 1202 | case GSM48_MT_GMM_DETACH_REQ: |
Jacob Erlbeck | f40a6c9 | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 1203 | gbprox_unregister_tlli(peer, parse_ctx->tlli); |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 1204 | break; |
| 1205 | |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1206 | default: |
| 1207 | break; |
| 1208 | }; |
| 1209 | |
| 1210 | return 0; |
| 1211 | } |
| 1212 | |
| 1213 | static void gbprox_patch_llc(struct msgb *msg, uint8_t *llc, size_t llc_len, |
Jacob Erlbeck | f14bb91 | 2014-06-27 19:56:05 +0200 | [diff] [blame] | 1214 | struct gbprox_peer *peer, int *len_change, |
Jacob Erlbeck | f40a6c9 | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 1215 | struct gbprox_parse_context *parse_ctx) |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1216 | { |
| 1217 | struct gprs_llc_hdr_parsed ghp = {0}; |
| 1218 | int rc; |
| 1219 | uint8_t *data; |
| 1220 | size_t data_len; |
| 1221 | int fcs; |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1222 | const char *err_info = NULL; |
| 1223 | int err_ctr = -1; |
Jacob Erlbeck | f40a6c9 | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 1224 | uint32_t tlli = parse_ctx->tlli; |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1225 | |
| 1226 | /* parse LLC */ |
| 1227 | rc = gprs_llc_hdr_parse(&ghp, llc, llc_len); |
| 1228 | gprs_llc_hdr_dump(&ghp); |
| 1229 | if (rc != 0) { |
| 1230 | LOGP(DLLC, LOGL_NOTICE, "Error during LLC header parsing\n"); |
| 1231 | return; |
| 1232 | } |
| 1233 | |
| 1234 | fcs = gprs_llc_fcs(llc, ghp.crc_length); |
| 1235 | LOGP(DLLC, LOGL_DEBUG, "Got LLC message, CRC: %06x (computed %06x)\n", |
| 1236 | ghp.fcs, fcs); |
| 1237 | |
| 1238 | if (!ghp.data) |
| 1239 | return; |
| 1240 | |
| 1241 | if (ghp.sapi != GPRS_SAPI_GMM) |
| 1242 | return; |
| 1243 | |
Jacob Erlbeck | f40a6c9 | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 1244 | if (gbcfg.core_apn && parse_ctx->to_bss && tlli && parse_ctx->imsi) |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 1245 | gbprox_register_tlli(peer, tlli, |
Jacob Erlbeck | f40a6c9 | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 1246 | parse_ctx->imsi, parse_ctx->imsi_len); |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 1247 | |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1248 | if (ghp.cmd != GPRS_LLC_UI) |
| 1249 | return; |
| 1250 | |
| 1251 | if (ghp.is_encrypted) { |
| 1252 | if (patching_is_required(GBPROX_PATCH_LLC_ATTACH)) { |
| 1253 | /* Patching LLC messages has been requested explicitly, |
| 1254 | * but the message (including the type) is encrypted, |
| 1255 | * so we possibly fail to patch the LLC part of the |
| 1256 | * message. */ |
| 1257 | |
| 1258 | err_info = "GMM message is encrypted"; |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 1259 | err_ctr = GBPROX_PEER_CTR_PATCH_CRYPT_ERR; |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1260 | goto patch_error; |
| 1261 | } |
| 1262 | |
| 1263 | return; |
| 1264 | } |
| 1265 | |
| 1266 | /* fix DTAP GMM/GSM */ |
| 1267 | data = ghp.data; |
| 1268 | data_len = ghp.data_len; |
| 1269 | |
Jacob Erlbeck | f40a6c9 | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 1270 | parse_ctx->llc_hdr_parsed = &ghp; |
| 1271 | |
Jacob Erlbeck | f14bb91 | 2014-06-27 19:56:05 +0200 | [diff] [blame] | 1272 | rc = gbprox_patch_dtap(msg, data, data_len, peer, len_change, parse_ctx); |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1273 | |
Jacob Erlbeck | f5b2085 | 2014-06-27 18:10:53 +0200 | [diff] [blame] | 1274 | if (parse_ctx->new_ptmsi && |
| 1275 | (parse_ctx->new_ptmsi | 0xc000) != (tlli | 0xc000) && |
| 1276 | gbcfg.core_apn && parse_ctx->to_bss && parse_ctx->imsi) { |
| 1277 | /* A new TLLI (PTMSI) has been signaled in the message */ |
| 1278 | LOGP(DGPRS, LOGL_INFO, |
| 1279 | "Got new TLLI/PTMSI %08x (current is %08x)\n", |
| 1280 | parse_ctx->new_ptmsi, tlli); |
| 1281 | gbprox_register_tlli(peer, parse_ctx->new_ptmsi, |
| 1282 | parse_ctx->imsi, parse_ctx->imsi_len); |
| 1283 | } |
| 1284 | |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1285 | if (rc > 0) { |
Jacob Erlbeck | f14bb91 | 2014-06-27 19:56:05 +0200 | [diff] [blame] | 1286 | llc_len += *len_change; |
| 1287 | ghp.crc_length += *len_change; |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1288 | |
| 1289 | /* Fix FCS */ |
| 1290 | fcs = gprs_llc_fcs(llc, ghp.crc_length); |
| 1291 | LOGP(DLLC, LOGL_DEBUG, "Updated LLC message, CRC: %06x -> %06x\n", |
| 1292 | ghp.fcs, fcs); |
| 1293 | |
| 1294 | llc[llc_len - 3] = fcs & 0xff; |
| 1295 | llc[llc_len - 2] = (fcs >> 8) & 0xff; |
| 1296 | llc[llc_len - 1] = (fcs >> 16) & 0xff; |
| 1297 | } |
| 1298 | |
| 1299 | return; |
| 1300 | |
| 1301 | patch_error: |
| 1302 | OSMO_ASSERT(err_ctr >= 0); |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 1303 | rate_ctr_inc(&peer->ctrg->ctr[err_ctr]); |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1304 | LOGP(DGPRS, LOGL_ERROR, |
| 1305 | "Failed to patch BSSGP/GMM message as requested: %s.\n", err_info); |
| 1306 | |
| 1307 | return; |
| 1308 | } |
| 1309 | |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 1310 | /* patch BSSGP message to use core_mcc/mnc on the SGSN side */ |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 1311 | static void gbprox_patch_bssgp_message(struct msgb *msg, |
| 1312 | struct gbprox_peer *peer, int to_bss) |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 1313 | { |
| 1314 | struct bssgp_normal_hdr *bgph; |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 1315 | struct bssgp_ud_hdr *budh = NULL; |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 1316 | struct tlv_parsed tp; |
| 1317 | uint8_t pdu_type; |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 1318 | uint8_t *data; |
| 1319 | size_t data_len; |
Jacob Erlbeck | f14bb91 | 2014-06-27 19:56:05 +0200 | [diff] [blame] | 1320 | const char *err_info = NULL; |
| 1321 | int err_ctr = -1; |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 1322 | |
Jacob Erlbeck | 5620c6d | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 1323 | if (!gbcfg.core_mcc && !gbcfg.core_mnc && !gbcfg.core_apn) |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 1324 | return; |
| 1325 | |
| 1326 | bgph = (struct bssgp_normal_hdr *) msgb_bssgph(msg); |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 1327 | pdu_type = bgph->pdu_type; |
| 1328 | |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 1329 | if (pdu_type == BSSGP_PDUT_UL_UNITDATA || |
| 1330 | pdu_type == BSSGP_PDUT_DL_UNITDATA) { |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 1331 | budh = (struct bssgp_ud_hdr *) msgb_bssgph(msg); |
| 1332 | bgph = NULL; |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 1333 | data = budh->data; |
| 1334 | data_len = msgb_bssgp_len(msg) - sizeof(*budh); |
| 1335 | } else { |
| 1336 | data = bgph->data; |
| 1337 | data_len = msgb_bssgp_len(msg) - sizeof(*bgph); |
| 1338 | } |
| 1339 | |
| 1340 | bssgp_tlv_parse(&tp, data, data_len); |
| 1341 | |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 1342 | if (!peer && msgb_bvci(msg) >= 2) |
| 1343 | peer = peer_by_bvci(msgb_bvci(msg)); |
| 1344 | |
| 1345 | if (!peer && !to_bss) |
| 1346 | peer = peer_by_nsei(msgb_nsei(msg)); |
| 1347 | |
| 1348 | if (!peer) |
| 1349 | peer = peer_by_bssgp_tlv(&tp); |
| 1350 | |
| 1351 | if (!peer) { |
| 1352 | LOGP(DLLC, LOGL_INFO, |
| 1353 | "NSEI=%d(%s) patching: didn't find peer for message, " |
| 1354 | "PDU %d\n", |
| 1355 | msgb_nsei(msg), to_bss ? "SGSN" : "BSS", pdu_type); |
| 1356 | /* Increment counter */ |
| 1357 | rate_ctr_inc(&get_global_ctrg()->ctr[GBPROX_GLOB_CTR_PATCH_PEER_ERR]); |
| 1358 | return; |
| 1359 | } |
| 1360 | |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 1361 | if (TLVP_PRESENT(&tp, BSSGP_IE_ROUTEING_AREA)) { |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 1362 | gbprox_patch_raid((uint8_t *)TLVP_VAL(&tp, BSSGP_IE_ROUTEING_AREA), |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 1363 | peer, to_bss, "ROUTING_AREA"); |
| 1364 | } |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 1365 | |
| 1366 | if (TLVP_PRESENT(&tp, BSSGP_IE_CELL_ID)) |
| 1367 | gbprox_patch_raid((uint8_t *)TLVP_VAL(&tp, BSSGP_IE_CELL_ID), |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 1368 | peer, to_bss, "CELL_ID"); |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1369 | |
| 1370 | if (TLVP_PRESENT(&tp, BSSGP_IE_LLC_PDU) && |
| 1371 | patching_is_enabled(GBPROX_PATCH_LLC_ATTACH_REQ)) { |
| 1372 | uint8_t *llc = (uint8_t *)TLVP_VAL(&tp, BSSGP_IE_LLC_PDU); |
| 1373 | size_t llc_len = TLVP_LEN(&tp, BSSGP_IE_LLC_PDU); |
Jacob Erlbeck | f40a6c9 | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 1374 | struct gbprox_parse_context parse_ctx = {0}; |
Jacob Erlbeck | f14bb91 | 2014-06-27 19:56:05 +0200 | [diff] [blame] | 1375 | int len_change = 0; |
Jacob Erlbeck | f40a6c9 | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 1376 | parse_ctx.bssgp_tp = &tp; |
| 1377 | parse_ctx.bud_hdr = budh; |
| 1378 | parse_ctx.tlli = budh ? ntohl(budh->tlli) : 0; |
| 1379 | parse_ctx.to_bss = to_bss; |
| 1380 | |
| 1381 | if (TLVP_PRESENT(&tp, BSSGP_IE_IMSI)) { |
| 1382 | parse_ctx.imsi = TLVP_VAL(&tp, BSSGP_IE_IMSI); |
| 1383 | parse_ctx.imsi_len = TLVP_LEN(&tp, BSSGP_IE_IMSI); |
| 1384 | } |
| 1385 | |
Jacob Erlbeck | f14bb91 | 2014-06-27 19:56:05 +0200 | [diff] [blame] | 1386 | gbprox_patch_llc(msg, llc, llc_len, peer, &len_change, &parse_ctx); |
| 1387 | |
| 1388 | if (len_change) { |
| 1389 | llc_len += len_change; |
| 1390 | |
| 1391 | /* Fix LLC IE len */ |
| 1392 | /* TODO: This is a kludge, but the a pointer to the |
| 1393 | * start of the IE is not available here */ |
| 1394 | if (llc[-2] == BSSGP_IE_LLC_PDU && llc[-1] & 0x80) { |
| 1395 | /* most probably a one byte length */ |
| 1396 | if (llc_len > 127) { |
| 1397 | err_info = "Cannot increase size"; |
| 1398 | err_ctr = GBPROX_PEER_CTR_PATCH_ERR; |
| 1399 | goto patch_error; |
| 1400 | } |
| 1401 | llc[-1] = llc_len | 0x80; |
| 1402 | } else { |
| 1403 | llc[-2] = (llc_len >> 8) & 0x7f; |
| 1404 | llc[-1] = llc_len & 0xff; |
| 1405 | } |
| 1406 | } |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1407 | /* Note that the tp struct might contain invalid pointers here |
| 1408 | * if the LLC field has changed its size */ |
| 1409 | } |
Jacob Erlbeck | f14bb91 | 2014-06-27 19:56:05 +0200 | [diff] [blame] | 1410 | return; |
| 1411 | |
| 1412 | patch_error: |
| 1413 | OSMO_ASSERT(err_ctr >= 0); |
| 1414 | rate_ctr_inc(&peer->ctrg->ctr[err_ctr]); |
| 1415 | LOGP(DGPRS, LOGL_ERROR, |
| 1416 | "Failed to patch BSSGP message as requested: %s.\n", err_info); |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 1417 | } |
| 1418 | |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1419 | /* feed a message down the NS-VC associated with the specified peer */ |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 1420 | static int gbprox_relay2sgsn(struct msgb *old_msg, |
| 1421 | struct gbprox_peer *peer, uint16_t ns_bvci) |
Harald Welte | f01709d | 2010-05-03 18:54:58 +0200 | [diff] [blame] | 1422 | { |
Harald Welte | 3fb22d6 | 2010-05-12 18:10:25 +0000 | [diff] [blame] | 1423 | /* create a copy of the message so the old one can |
| 1424 | * be free()d safely when we return from gbprox_rcvmsg() */ |
| 1425 | struct msgb *msg = msgb_copy(old_msg, "msgb_relay2sgsn"); |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1426 | int rc; |
Harald Welte | 3fb22d6 | 2010-05-12 18:10:25 +0000 | [diff] [blame] | 1427 | |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 1428 | gbprox_patch_bssgp_message(msg, peer, 0); |
| 1429 | |
Harald Welte | b8da061 | 2010-05-11 20:20:13 +0200 | [diff] [blame] | 1430 | DEBUGP(DGPRS, "NSEI=%u proxying BTS->SGSN (NS_BVCI=%u, NSEI=%u)\n", |
Harald Welte | e661b27 | 2010-05-03 19:28:05 +0200 | [diff] [blame] | 1431 | msgb_nsei(msg), ns_bvci, gbcfg.nsip_sgsn_nsei); |
Harald Welte | 6aa24d1 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 1432 | |
Harald Welte | f01709d | 2010-05-03 18:54:58 +0200 | [diff] [blame] | 1433 | msgb_bvci(msg) = ns_bvci; |
| 1434 | msgb_nsei(msg) = gbcfg.nsip_sgsn_nsei; |
| 1435 | |
Harald Welte | 3ad3243 | 2010-05-03 19:05:10 +0200 | [diff] [blame] | 1436 | strip_ns_hdr(msg); |
| 1437 | |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1438 | rc = gprs_ns_sendmsg(bssgp_nsi, msg); |
| 1439 | if (rc < 0) |
| 1440 | rate_ctr_inc(&get_global_ctrg()->ctr[GBPROX_GLOB_CTR_TX_ERR_SGSN]); |
| 1441 | |
| 1442 | return rc; |
Harald Welte | f01709d | 2010-05-03 18:54:58 +0200 | [diff] [blame] | 1443 | } |
| 1444 | |
Harald Welte | f01709d | 2010-05-03 18:54:58 +0200 | [diff] [blame] | 1445 | /* feed a message down the NS-VC associated with the specified peer */ |
Harald Welte | 3fb22d6 | 2010-05-12 18:10:25 +0000 | [diff] [blame] | 1446 | static int gbprox_relay2peer(struct msgb *old_msg, struct gbprox_peer *peer, |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1447 | uint16_t ns_bvci) |
| 1448 | { |
Harald Welte | 3fb22d6 | 2010-05-12 18:10:25 +0000 | [diff] [blame] | 1449 | /* create a copy of the message so the old one can |
| 1450 | * be free()d safely when we return from gbprox_rcvmsg() */ |
| 1451 | struct msgb *msg = msgb_copy(old_msg, "msgb_relay2peer"); |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1452 | int rc; |
Harald Welte | 3fb22d6 | 2010-05-12 18:10:25 +0000 | [diff] [blame] | 1453 | |
Harald Welte | 0cc900d | 2010-05-13 10:34:56 +0200 | [diff] [blame] | 1454 | DEBUGP(DGPRS, "NSEI=%u proxying SGSN->BSS (NS_BVCI=%u, NSEI=%u)\n", |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1455 | msgb_nsei(msg), ns_bvci, peer->nsei); |
Harald Welte | 6aa24d1 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 1456 | |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1457 | msgb_bvci(msg) = ns_bvci; |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1458 | msgb_nsei(msg) = peer->nsei; |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1459 | |
Harald Welte | 0cc900d | 2010-05-13 10:34:56 +0200 | [diff] [blame] | 1460 | /* Strip the old NS header, it will be replaced with a new one */ |
Harald Welte | 3ad3243 | 2010-05-03 19:05:10 +0200 | [diff] [blame] | 1461 | strip_ns_hdr(msg); |
| 1462 | |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1463 | rc = gprs_ns_sendmsg(bssgp_nsi, msg); |
| 1464 | if (rc < 0) |
| 1465 | rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_TX_ERR]); |
| 1466 | |
| 1467 | return rc; |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1468 | } |
| 1469 | |
Harald Welte | 51b7d40 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 1470 | static int block_unblock_peer(uint16_t ptp_bvci, uint8_t pdu_type) |
| 1471 | { |
| 1472 | struct gbprox_peer *peer; |
| 1473 | |
| 1474 | peer = peer_by_bvci(ptp_bvci); |
| 1475 | if (!peer) { |
| 1476 | LOGP(DGPRS, LOGL_ERROR, "BVCI=%u: Cannot find BSS\n", |
| 1477 | ptp_bvci); |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1478 | rate_ctr_inc(&get_global_ctrg()->ctr[GBPROX_GLOB_CTR_INV_BVCI]); |
Harald Welte | 51b7d40 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 1479 | return -ENOENT; |
| 1480 | } |
| 1481 | |
| 1482 | switch (pdu_type) { |
| 1483 | case BSSGP_PDUT_BVC_BLOCK_ACK: |
| 1484 | peer->blocked = 1; |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1485 | rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_BLOCKED]); |
Harald Welte | 51b7d40 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 1486 | break; |
| 1487 | case BSSGP_PDUT_BVC_UNBLOCK_ACK: |
| 1488 | peer->blocked = 0; |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1489 | rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_UNBLOCKED]); |
Harald Welte | 51b7d40 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 1490 | break; |
| 1491 | default: |
| 1492 | break; |
| 1493 | } |
| 1494 | return 0; |
| 1495 | } |
| 1496 | |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1497 | /* Send a message to a peer identified by ptp_bvci but using ns_bvci |
| 1498 | * in the NS hdr */ |
Harald Welte | 3ad3243 | 2010-05-03 19:05:10 +0200 | [diff] [blame] | 1499 | static int gbprox_relay2bvci(struct msgb *msg, uint16_t ptp_bvci, |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1500 | uint16_t ns_bvci) |
| 1501 | { |
| 1502 | struct gbprox_peer *peer; |
| 1503 | |
| 1504 | peer = peer_by_bvci(ptp_bvci); |
Harald Welte | 0358aae | 2010-05-03 21:37:11 +0200 | [diff] [blame] | 1505 | if (!peer) { |
Harald Welte | 93048cf | 2010-05-13 14:14:56 +0200 | [diff] [blame] | 1506 | LOGP(DGPRS, LOGL_ERROR, "BVCI=%u: Cannot find BSS\n", |
Harald Welte | 0358aae | 2010-05-03 21:37:11 +0200 | [diff] [blame] | 1507 | ptp_bvci); |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1508 | rate_ctr_inc(&get_global_ctrg()->ctr[GBPROX_GLOB_CTR_INV_BVCI]); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1509 | return -ENOENT; |
Harald Welte | 0358aae | 2010-05-03 21:37:11 +0200 | [diff] [blame] | 1510 | } |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1511 | |
Harald Welte | 3ad3243 | 2010-05-03 19:05:10 +0200 | [diff] [blame] | 1512 | return gbprox_relay2peer(msg, peer, ns_bvci); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1513 | } |
| 1514 | |
Harald Welte | a62e9fe | 2012-06-17 12:16:31 +0800 | [diff] [blame] | 1515 | int bssgp_prim_cb(struct osmo_prim_hdr *oph, void *ctx) |
| 1516 | { |
| 1517 | return 0; |
| 1518 | } |
| 1519 | |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1520 | /* Receive an incoming signalling message from a BSS-side NS-VC */ |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1521 | static int gbprox_rx_sig_from_bss(struct msgb *msg, uint16_t nsei, |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1522 | uint16_t ns_bvci) |
| 1523 | { |
Harald Welte | 2ac2e91 | 2010-05-03 16:30:59 +0200 | [diff] [blame] | 1524 | struct bssgp_normal_hdr *bgph = (struct bssgp_normal_hdr *) msgb_bssgph(msg); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1525 | struct tlv_parsed tp; |
| 1526 | uint8_t pdu_type = bgph->pdu_type; |
Harald Welte | 2ac2e91 | 2010-05-03 16:30:59 +0200 | [diff] [blame] | 1527 | int data_len = msgb_bssgp_len(msg) - sizeof(*bgph); |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 1528 | struct gbprox_peer *from_peer = NULL; |
Harald Welte | e49c829 | 2010-05-01 12:10:57 +0200 | [diff] [blame] | 1529 | struct gprs_ra_id raid; |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1530 | |
Harald Welte | 4127072 | 2011-02-06 17:13:12 +0100 | [diff] [blame] | 1531 | if (ns_bvci != 0 && ns_bvci != 1) { |
Harald Welte | 93048cf | 2010-05-13 14:14:56 +0200 | [diff] [blame] | 1532 | LOGP(DGPRS, LOGL_NOTICE, "NSEI=%u BVCI=%u is not signalling\n", |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1533 | nsei, ns_bvci); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1534 | return -EINVAL; |
| 1535 | } |
| 1536 | |
| 1537 | /* we actually should never see those two for BVCI == 0, but double-check |
| 1538 | * just to make sure */ |
| 1539 | if (pdu_type == BSSGP_PDUT_UL_UNITDATA || |
| 1540 | pdu_type == BSSGP_PDUT_DL_UNITDATA) { |
Harald Welte | 6aa24d1 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 1541 | LOGP(DGPRS, LOGL_NOTICE, "NSEI=%u UNITDATA not allowed in " |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1542 | "signalling\n", nsei); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1543 | return -EINVAL; |
| 1544 | } |
| 1545 | |
| 1546 | bssgp_tlv_parse(&tp, bgph->data, data_len); |
| 1547 | |
| 1548 | switch (pdu_type) { |
| 1549 | case BSSGP_PDUT_SUSPEND: |
| 1550 | case BSSGP_PDUT_RESUME: |
Jacob Erlbeck | 9d7268a | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 1551 | /* We implement RAI snooping during SUSPEND/RESUME, since it |
| 1552 | * establishes a relationsip between BVCI/peer and the routeing |
| 1553 | * area identification. The snooped information is then used |
| 1554 | * for routing the {SUSPEND,RESUME}_[N]ACK back to the correct |
| 1555 | * BSSGP */ |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1556 | if (!TLVP_PRESENT(&tp, BSSGP_IE_ROUTEING_AREA)) |
| 1557 | goto err_mand_ie; |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1558 | from_peer = peer_by_nsei(nsei); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1559 | if (!from_peer) |
| 1560 | goto err_no_peer; |
Harald Welte | 8ba9d2d | 2010-05-12 00:07:29 +0200 | [diff] [blame] | 1561 | memcpy(from_peer->ra, TLVP_VAL(&tp, BSSGP_IE_ROUTEING_AREA), |
| 1562 | sizeof(from_peer->ra)); |
Harald Welte | f2fdefe | 2010-05-11 10:15:42 +0200 | [diff] [blame] | 1563 | gsm48_parse_ra(&raid, from_peer->ra); |
Harald Welte | 93048cf | 2010-05-13 14:14:56 +0200 | [diff] [blame] | 1564 | LOGP(DGPRS, LOGL_INFO, "NSEI=%u BSSGP SUSPEND/RESUME " |
Jacob Erlbeck | 9d7268a | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 1565 | "RAI snooping: RAI %u-%u-%u-%u behind BVCI=%u\n", |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1566 | nsei, raid.mcc, raid.mnc, raid.lac, |
| 1567 | raid.rac , from_peer->bvci); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1568 | /* FIXME: This only supports one BSS per RA */ |
| 1569 | break; |
Harald Welte | 6aa24d1 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 1570 | case BSSGP_PDUT_BVC_RESET: |
| 1571 | /* If we receive a BVC reset on the signalling endpoint, we |
| 1572 | * don't want the SGSN to reset, as the signalling endpoint |
| 1573 | * is common for all point-to-point BVCs (and thus all BTS) */ |
| 1574 | if (TLVP_PRESENT(&tp, BSSGP_IE_BVCI)) { |
Holger Hans Peter Freyther | 25eeaab | 2012-09-04 20:42:20 +0200 | [diff] [blame] | 1575 | uint16_t bvci = ntohs(tlvp_val16_unal(&tp, BSSGP_IE_BVCI)); |
Harald Welte | be6e25a | 2010-05-12 00:20:41 +0200 | [diff] [blame] | 1576 | LOGP(DGPRS, LOGL_INFO, "NSEI=%u Rx BVC RESET (BVCI=%u)\n", |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1577 | nsei, bvci); |
Harald Welte | 6aa24d1 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 1578 | if (bvci == 0) { |
| 1579 | /* FIXME: only do this if SGSN is alive! */ |
Harald Welte | b8da061 | 2010-05-11 20:20:13 +0200 | [diff] [blame] | 1580 | LOGP(DGPRS, LOGL_INFO, "NSEI=%u Tx fake " |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1581 | "BVC RESET ACK of BVCI=0\n", nsei); |
Harald Welte | 6aa24d1 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 1582 | return bssgp_tx_simple_bvci(BSSGP_PDUT_BVC_RESET_ACK, |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1583 | nsei, 0, ns_bvci); |
Harald Welte | 8ba9d2d | 2010-05-12 00:07:29 +0200 | [diff] [blame] | 1584 | } |
| 1585 | from_peer = peer_by_bvci(bvci); |
| 1586 | if (!from_peer) { |
Harald Welte | 0358aae | 2010-05-03 21:37:11 +0200 | [diff] [blame] | 1587 | /* if a PTP-BVC is reset, and we don't know that |
| 1588 | * PTP-BVCI yet, we should allocate a new peer */ |
| 1589 | LOGP(DGPRS, LOGL_INFO, "Allocationg new peer for " |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1590 | "BVCI=%u via NSEI=%u\n", bvci, nsei); |
Harald Welte | 0358aae | 2010-05-03 21:37:11 +0200 | [diff] [blame] | 1591 | from_peer = peer_alloc(bvci); |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1592 | from_peer->nsei = nsei; |
Harald Welte | 6aa24d1 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 1593 | } |
Jacob Erlbeck | d0a9b50 | 2013-10-24 12:48:56 +0200 | [diff] [blame] | 1594 | |
| 1595 | if (!check_peer_nsei(from_peer, nsei)) |
| 1596 | from_peer->nsei = nsei; |
| 1597 | |
Harald Welte | 8ba9d2d | 2010-05-12 00:07:29 +0200 | [diff] [blame] | 1598 | if (TLVP_PRESENT(&tp, BSSGP_IE_CELL_ID)) { |
| 1599 | struct gprs_ra_id raid; |
| 1600 | /* We have a Cell Identifier present in this |
| 1601 | * PDU, this means we can extend our local |
| 1602 | * state information about this particular cell |
| 1603 | * */ |
| 1604 | memcpy(from_peer->ra, |
| 1605 | TLVP_VAL(&tp, BSSGP_IE_CELL_ID), |
| 1606 | sizeof(from_peer->ra)); |
| 1607 | gsm48_parse_ra(&raid, from_peer->ra); |
| 1608 | LOGP(DGPRS, LOGL_INFO, "NSEI=%u/BVCI=%u " |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1609 | "Cell ID %u-%u-%u-%u\n", nsei, |
Harald Welte | 8ba9d2d | 2010-05-12 00:07:29 +0200 | [diff] [blame] | 1610 | bvci, raid.mcc, raid.mnc, raid.lac, |
| 1611 | raid.rac); |
| 1612 | } |
Harald Welte | 6aa24d1 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 1613 | } |
| 1614 | break; |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1615 | } |
| 1616 | |
Harald Welte | b8da061 | 2010-05-11 20:20:13 +0200 | [diff] [blame] | 1617 | /* Normally, we can simply pass on all signalling messages from BSS to |
| 1618 | * SGSN */ |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 1619 | return gbprox_relay2sgsn(msg, from_peer, ns_bvci); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1620 | err_no_peer: |
Jacob Erlbeck | 700b873 | 2013-10-18 13:04:48 +0200 | [diff] [blame] | 1621 | LOGP(DGPRS, LOGL_ERROR, "NSEI=%u(BSS) cannot find peer based on NSEI\n", |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1622 | nsei); |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1623 | rate_ctr_inc(&get_global_ctrg()->ctr[GBPROX_GLOB_CTR_INV_NSEI]); |
Harald Welte | 874acec | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1624 | return bssgp_tx_status(BSSGP_CAUSE_UNKNOWN_BVCI, NULL, msg); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1625 | err_mand_ie: |
Harald Welte | 874acec | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1626 | LOGP(DGPRS, LOGL_ERROR, "NSEI=%u(BSS) missing mandatory RA IE\n", |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1627 | nsei); |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1628 | rate_ctr_inc(&get_global_ctrg()->ctr[GBPROX_GLOB_CTR_PROTO_ERR_BSS]); |
Harald Welte | 874acec | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1629 | return bssgp_tx_status(BSSGP_CAUSE_MISSING_MAND_IE, NULL, msg); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1630 | } |
| 1631 | |
| 1632 | /* Receive paging request from SGSN, we need to relay to proper BSS */ |
| 1633 | static int gbprox_rx_paging(struct msgb *msg, struct tlv_parsed *tp, |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1634 | uint32_t nsei, uint16_t ns_bvci) |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1635 | { |
Harald Welte | 93048cf | 2010-05-13 14:14:56 +0200 | [diff] [blame] | 1636 | struct gbprox_peer *peer = NULL; |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1637 | int errctr = GBPROX_GLOB_CTR_PROTO_ERR_SGSN; |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1638 | |
Harald Welte | 93048cf | 2010-05-13 14:14:56 +0200 | [diff] [blame] | 1639 | LOGP(DGPRS, LOGL_INFO, "NSEI=%u(SGSN) BSSGP PAGING ", |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1640 | nsei); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1641 | if (TLVP_PRESENT(tp, BSSGP_IE_BVCI)) { |
Holger Hans Peter Freyther | 25eeaab | 2012-09-04 20:42:20 +0200 | [diff] [blame] | 1642 | uint16_t bvci = ntohs(tlvp_val16_unal(tp, BSSGP_IE_BVCI)); |
Harald Welte | 93048cf | 2010-05-13 14:14:56 +0200 | [diff] [blame] | 1643 | LOGPC(DGPRS, LOGL_INFO, "routing by BVCI to peer BVCI=%u\n", |
| 1644 | bvci); |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1645 | errctr = GBPROX_GLOB_CTR_OTHER_ERR; |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1646 | } else if (TLVP_PRESENT(tp, BSSGP_IE_ROUTEING_AREA)) { |
Jacob Erlbeck | 9d7268a | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 1647 | peer = peer_by_rai(TLVP_VAL(tp, BSSGP_IE_ROUTEING_AREA)); |
| 1648 | LOGPC(DGPRS, LOGL_INFO, "routing by RAI to peer BVCI=%u\n", |
Holger Hans Peter Freyther | 98b82c1 | 2010-06-08 16:30:24 +0800 | [diff] [blame] | 1649 | peer ? peer->bvci : -1); |
Jacob Erlbeck | 9d7268a | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 1650 | errctr = GBPROX_GLOB_CTR_INV_RAI; |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1651 | } else if (TLVP_PRESENT(tp, BSSGP_IE_LOCATION_AREA)) { |
Jacob Erlbeck | 9d7268a | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 1652 | peer = peer_by_lai(TLVP_VAL(tp, BSSGP_IE_LOCATION_AREA)); |
| 1653 | LOGPC(DGPRS, LOGL_INFO, "routing by LAI to peer BVCI=%u\n", |
Holger Hans Peter Freyther | 98b82c1 | 2010-06-08 16:30:24 +0800 | [diff] [blame] | 1654 | peer ? peer->bvci : -1); |
Jacob Erlbeck | 9d7268a | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 1655 | errctr = GBPROX_GLOB_CTR_INV_LAI; |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1656 | } else |
Harald Welte | 93048cf | 2010-05-13 14:14:56 +0200 | [diff] [blame] | 1657 | LOGPC(DGPRS, LOGL_INFO, "\n"); |
| 1658 | |
| 1659 | if (!peer) { |
| 1660 | LOGP(DGPRS, LOGL_ERROR, "NSEI=%u(SGSN) BSSGP PAGING: " |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1661 | "unable to route, missing IE\n", nsei); |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1662 | rate_ctr_inc(&get_global_ctrg()->ctr[errctr]); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1663 | return -EINVAL; |
Harald Welte | 93048cf | 2010-05-13 14:14:56 +0200 | [diff] [blame] | 1664 | } |
| 1665 | return gbprox_relay2peer(msg, peer, ns_bvci); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1666 | } |
| 1667 | |
Harald Welte | 874acec | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1668 | /* Receive an incoming BVC-RESET message from the SGSN */ |
| 1669 | static int rx_reset_from_sgsn(struct msgb *msg, struct tlv_parsed *tp, |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1670 | uint32_t nsei, uint16_t ns_bvci) |
Harald Welte | 874acec | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1671 | { |
| 1672 | struct gbprox_peer *peer; |
| 1673 | uint16_t ptp_bvci; |
| 1674 | |
| 1675 | if (!TLVP_PRESENT(tp, BSSGP_IE_BVCI)) { |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1676 | rate_ctr_inc(&get_global_ctrg()-> |
| 1677 | ctr[GBPROX_GLOB_CTR_PROTO_ERR_SGSN]); |
Harald Welte | 874acec | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1678 | return bssgp_tx_status(BSSGP_CAUSE_MISSING_MAND_IE, |
| 1679 | NULL, msg); |
| 1680 | } |
Holger Hans Peter Freyther | 25eeaab | 2012-09-04 20:42:20 +0200 | [diff] [blame] | 1681 | ptp_bvci = ntohs(tlvp_val16_unal(tp, BSSGP_IE_BVCI)); |
Harald Welte | 874acec | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1682 | |
| 1683 | if (ptp_bvci >= 2) { |
| 1684 | /* A reset for a PTP BVC was received, forward it to its |
| 1685 | * respective peer */ |
| 1686 | peer = peer_by_bvci(ptp_bvci); |
| 1687 | if (!peer) { |
Harald Welte | 93048cf | 2010-05-13 14:14:56 +0200 | [diff] [blame] | 1688 | LOGP(DGPRS, LOGL_ERROR, "NSEI=%u BVCI=%u: Cannot find BSS\n", |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1689 | nsei, ptp_bvci); |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1690 | rate_ctr_inc(&get_global_ctrg()-> |
| 1691 | ctr[GBPROX_GLOB_CTR_INV_BVCI]); |
Harald Welte | 874acec | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1692 | return bssgp_tx_status(BSSGP_CAUSE_UNKNOWN_BVCI, |
| 1693 | NULL, msg); |
| 1694 | } |
| 1695 | return gbprox_relay2peer(msg, peer, ns_bvci); |
| 1696 | } |
| 1697 | |
| 1698 | /* A reset for the Signalling entity has been received |
| 1699 | * from the SGSN. As the signalling BVCI is shared |
| 1700 | * among all the BSS's that we multiplex, it needs to |
| 1701 | * be relayed */ |
Holger Hans Peter Freyther | 5eaf1a2 | 2014-08-04 11:10:09 +0200 | [diff] [blame^] | 1702 | llist_for_each_entry(peer, &gbcfg.bts_peers, list) |
Harald Welte | 874acec | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1703 | gbprox_relay2peer(msg, peer, ns_bvci); |
| 1704 | |
| 1705 | return 0; |
| 1706 | } |
| 1707 | |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1708 | /* Receive an incoming signalling message from the SGSN-side NS-VC */ |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1709 | static int gbprox_rx_sig_from_sgsn(struct msgb *msg, uint32_t nsei, |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1710 | uint16_t ns_bvci) |
| 1711 | { |
Harald Welte | 2ac2e91 | 2010-05-03 16:30:59 +0200 | [diff] [blame] | 1712 | struct bssgp_normal_hdr *bgph = (struct bssgp_normal_hdr *) msgb_bssgph(msg); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1713 | struct tlv_parsed tp; |
| 1714 | uint8_t pdu_type = bgph->pdu_type; |
Harald Welte | 2ac2e91 | 2010-05-03 16:30:59 +0200 | [diff] [blame] | 1715 | int data_len = msgb_bssgp_len(msg) - sizeof(*bgph); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1716 | struct gbprox_peer *peer; |
| 1717 | uint16_t bvci; |
| 1718 | int rc = 0; |
| 1719 | |
Harald Welte | 4127072 | 2011-02-06 17:13:12 +0100 | [diff] [blame] | 1720 | if (ns_bvci != 0 && ns_bvci != 1) { |
Harald Welte | 93048cf | 2010-05-13 14:14:56 +0200 | [diff] [blame] | 1721 | LOGP(DGPRS, LOGL_NOTICE, "NSEI=%u(SGSN) BVCI=%u is not " |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1722 | "signalling\n", nsei, ns_bvci); |
Harald Welte | 874acec | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1723 | /* FIXME: Send proper error message */ |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1724 | return -EINVAL; |
| 1725 | } |
| 1726 | |
| 1727 | /* we actually should never see those two for BVCI == 0, but double-check |
| 1728 | * just to make sure */ |
| 1729 | if (pdu_type == BSSGP_PDUT_UL_UNITDATA || |
| 1730 | pdu_type == BSSGP_PDUT_DL_UNITDATA) { |
Harald Welte | 6aa24d1 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 1731 | LOGP(DGPRS, LOGL_NOTICE, "NSEI=%u(SGSN) UNITDATA not allowed in " |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1732 | "signalling\n", nsei); |
Harald Welte | 874acec | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1733 | return bssgp_tx_status(BSSGP_CAUSE_PROTO_ERR_UNSPEC, NULL, msg); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1734 | } |
| 1735 | |
| 1736 | rc = bssgp_tlv_parse(&tp, bgph->data, data_len); |
| 1737 | |
| 1738 | switch (pdu_type) { |
Harald Welte | 874acec | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1739 | case BSSGP_PDUT_BVC_RESET: |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1740 | rc = rx_reset_from_sgsn(msg, &tp, nsei, ns_bvci); |
Harald Welte | 874acec | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1741 | break; |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1742 | case BSSGP_PDUT_FLUSH_LL: |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1743 | case BSSGP_PDUT_BVC_RESET_ACK: |
| 1744 | /* simple case: BVCI IE is mandatory */ |
| 1745 | if (!TLVP_PRESENT(&tp, BSSGP_IE_BVCI)) |
| 1746 | goto err_mand_ie; |
Holger Hans Peter Freyther | 25eeaab | 2012-09-04 20:42:20 +0200 | [diff] [blame] | 1747 | bvci = ntohs(tlvp_val16_unal(&tp, BSSGP_IE_BVCI)); |
Harald Welte | 3ad3243 | 2010-05-03 19:05:10 +0200 | [diff] [blame] | 1748 | rc = gbprox_relay2bvci(msg, bvci, ns_bvci); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1749 | break; |
| 1750 | case BSSGP_PDUT_PAGING_PS: |
| 1751 | case BSSGP_PDUT_PAGING_CS: |
Jacob Erlbeck | 9d7268a | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 1752 | /* process the paging request (LAI/RAI lookup) */ |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1753 | rc = gbprox_rx_paging(msg, &tp, nsei, ns_bvci); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1754 | break; |
| 1755 | case BSSGP_PDUT_STATUS: |
Harald Welte | 874acec | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1756 | /* Some exception has occurred */ |
Harald Welte | 6aa24d1 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 1757 | LOGP(DGPRS, LOGL_NOTICE, |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1758 | "NSEI=%u(SGSN) BSSGP STATUS ", nsei); |
Harald Welte | 874acec | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1759 | if (!TLVP_PRESENT(&tp, BSSGP_IE_CAUSE)) { |
| 1760 | LOGPC(DGPRS, LOGL_NOTICE, "\n"); |
| 1761 | goto err_mand_ie; |
| 1762 | } |
| 1763 | LOGPC(DGPRS, LOGL_NOTICE, |
| 1764 | "cause=0x%02x(%s) ", *TLVP_VAL(&tp, BSSGP_IE_CAUSE), |
| 1765 | bssgp_cause_str(*TLVP_VAL(&tp, BSSGP_IE_CAUSE))); |
| 1766 | if (TLVP_PRESENT(&tp, BSSGP_IE_BVCI)) { |
Holger Hans Peter Freyther | 25eeaab | 2012-09-04 20:42:20 +0200 | [diff] [blame] | 1767 | uint16_t bvci = tlvp_val16_unal(&tp, BSSGP_IE_BVCI); |
Harald Welte | 874acec | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1768 | LOGPC(DGPRS, LOGL_NOTICE, |
Holger Hans Peter Freyther | 25eeaab | 2012-09-04 20:42:20 +0200 | [diff] [blame] | 1769 | "BVCI=%u\n", ntohs(bvci)); |
Harald Welte | 874acec | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1770 | } else |
| 1771 | LOGPC(DGPRS, LOGL_NOTICE, "\n"); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1772 | break; |
| 1773 | /* those only exist in the SGSN -> BSS direction */ |
| 1774 | case BSSGP_PDUT_SUSPEND_ACK: |
| 1775 | case BSSGP_PDUT_SUSPEND_NACK: |
| 1776 | case BSSGP_PDUT_RESUME_ACK: |
| 1777 | case BSSGP_PDUT_RESUME_NACK: |
Jacob Erlbeck | 9d7268a | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 1778 | /* RAI IE is mandatory */ |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1779 | if (!TLVP_PRESENT(&tp, BSSGP_IE_ROUTEING_AREA)) |
| 1780 | goto err_mand_ie; |
Jacob Erlbeck | 9d7268a | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 1781 | peer = peer_by_rai(TLVP_VAL(&tp, BSSGP_IE_ROUTEING_AREA)); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1782 | if (!peer) |
| 1783 | goto err_no_peer; |
Harald Welte | 3ad3243 | 2010-05-03 19:05:10 +0200 | [diff] [blame] | 1784 | rc = gbprox_relay2peer(msg, peer, ns_bvci); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1785 | break; |
Harald Welte | 51b7d40 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 1786 | case BSSGP_PDUT_BVC_BLOCK_ACK: |
| 1787 | case BSSGP_PDUT_BVC_UNBLOCK_ACK: |
| 1788 | if (!TLVP_PRESENT(&tp, BSSGP_IE_BVCI)) |
| 1789 | goto err_mand_ie; |
Holger Hans Peter Freyther | 25eeaab | 2012-09-04 20:42:20 +0200 | [diff] [blame] | 1790 | bvci = ntohs(tlvp_val16_unal(&tp, BSSGP_IE_BVCI)); |
Harald Welte | 51b7d40 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 1791 | if (bvci == 0) { |
| 1792 | LOGP(DGPRS, LOGL_NOTICE, "NSEI=%u(SGSN) BSSGP " |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1793 | "%sBLOCK_ACK for signalling BVCI ?!?\n", nsei, |
Harald Welte | 51b7d40 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 1794 | pdu_type == BSSGP_PDUT_BVC_UNBLOCK_ACK ? "UN":""); |
| 1795 | /* should we send STATUS ? */ |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1796 | rate_ctr_inc(&get_global_ctrg()-> |
| 1797 | ctr[GBPROX_GLOB_CTR_INV_BVCI]); |
Harald Welte | 51b7d40 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 1798 | } else { |
| 1799 | /* Mark BVC as (un)blocked */ |
| 1800 | block_unblock_peer(bvci, pdu_type); |
| 1801 | } |
| 1802 | rc = gbprox_relay2bvci(msg, bvci, ns_bvci); |
| 1803 | break; |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1804 | case BSSGP_PDUT_SGSN_INVOKE_TRACE: |
Harald Welte | 6aa24d1 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 1805 | LOGP(DGPRS, LOGL_ERROR, |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1806 | "NSEI=%u(SGSN) BSSGP INVOKE TRACE not supported\n",nsei); |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1807 | rate_ctr_inc(&get_global_ctrg()-> |
| 1808 | ctr[GBPROX_GLOB_CTR_NOT_SUPPORTED_SGSN]); |
Harald Welte | 874acec | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1809 | rc = bssgp_tx_status(BSSGP_CAUSE_PDU_INCOMP_FEAT, NULL, msg); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1810 | break; |
| 1811 | default: |
Harald Welte | be6e25a | 2010-05-12 00:20:41 +0200 | [diff] [blame] | 1812 | LOGP(DGPRS, LOGL_NOTICE, "BSSGP PDU type 0x%02x unknown\n", |
| 1813 | pdu_type); |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1814 | rate_ctr_inc(&get_global_ctrg()-> |
| 1815 | ctr[GBPROX_GLOB_CTR_PROTO_ERR_SGSN]); |
Harald Welte | 874acec | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1816 | rc = bssgp_tx_status(BSSGP_CAUSE_PROTO_ERR_UNSPEC, NULL, msg); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1817 | break; |
| 1818 | } |
| 1819 | |
| 1820 | return rc; |
| 1821 | err_mand_ie: |
Harald Welte | 0358aae | 2010-05-03 21:37:11 +0200 | [diff] [blame] | 1822 | LOGP(DGPRS, LOGL_ERROR, "NSEI=%u(SGSN) missing mandatory IE\n", |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1823 | nsei); |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1824 | rate_ctr_inc(&get_global_ctrg()-> |
| 1825 | ctr[GBPROX_GLOB_CTR_PROTO_ERR_SGSN]); |
Harald Welte | 874acec | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1826 | return bssgp_tx_status(BSSGP_CAUSE_MISSING_MAND_IE, NULL, msg); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1827 | err_no_peer: |
Jacob Erlbeck | 9d7268a | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 1828 | LOGP(DGPRS, LOGL_ERROR, "NSEI=%u(SGSN) cannot find peer based on RAI\n", |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1829 | nsei); |
Jacob Erlbeck | 9d7268a | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 1830 | rate_ctr_inc(&get_global_ctrg()-> ctr[GBPROX_GLOB_CTR_INV_RAI]); |
Harald Welte | 874acec | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1831 | return bssgp_tx_status(BSSGP_CAUSE_UNKNOWN_BVCI, NULL, msg); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1832 | } |
| 1833 | |
| 1834 | /* Main input function for Gb proxy */ |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1835 | int gbprox_rcvmsg(struct msgb *msg, uint16_t nsei, uint16_t ns_bvci, uint16_t nsvci) |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1836 | { |
Harald Welte | f01709d | 2010-05-03 18:54:58 +0200 | [diff] [blame] | 1837 | int rc; |
Harald Welte | 51b7d40 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 1838 | struct gbprox_peer *peer; |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1839 | int remote_end_is_sgsn = nsei == gbcfg.nsip_sgsn_nsei; |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1840 | |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 1841 | if (remote_end_is_sgsn) |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 1842 | gbprox_patch_bssgp_message(msg, NULL, 1); |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 1843 | |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1844 | /* Only BVCI=0 messages need special treatment */ |
| 1845 | if (ns_bvci == 0 || ns_bvci == 1) { |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1846 | if (remote_end_is_sgsn) |
| 1847 | rc = gbprox_rx_sig_from_sgsn(msg, nsei, ns_bvci); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1848 | else |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1849 | rc = gbprox_rx_sig_from_bss(msg, nsei, ns_bvci); |
Harald Welte | f01709d | 2010-05-03 18:54:58 +0200 | [diff] [blame] | 1850 | } else { |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1851 | peer = peer_by_bvci(ns_bvci); |
| 1852 | |
Harald Welte | f01709d | 2010-05-03 18:54:58 +0200 | [diff] [blame] | 1853 | /* All other BVCI are PTP and thus can be simply forwarded */ |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1854 | if (!remote_end_is_sgsn) { |
| 1855 | if (peer) |
| 1856 | check_peer_nsei(peer, nsei); |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 1857 | return gbprox_relay2sgsn(msg, peer, ns_bvci); |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1858 | } |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1859 | |
Harald Welte | 51b7d40 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 1860 | /* else: SGSN -> BSS direction */ |
Harald Welte | 51b7d40 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 1861 | if (!peer) { |
Jacob Erlbeck | 901b9a4 | 2013-10-18 22:12:17 +0200 | [diff] [blame] | 1862 | LOGP(DGPRS, LOGL_INFO, "Didn't find peer for " |
| 1863 | "BVCI=%u for message from NSVC=%u/NSEI=%u (SGSN)\n", |
| 1864 | ns_bvci, nsvci, nsei); |
| 1865 | rate_ctr_inc(&get_global_ctrg()-> |
| 1866 | ctr[GBPROX_GLOB_CTR_INV_BVCI]); |
| 1867 | return bssgp_tx_status(BSSGP_CAUSE_UNKNOWN_BVCI, |
| 1868 | &ns_bvci, msg); |
Harald Welte | 51b7d40 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 1869 | } |
| 1870 | if (peer->blocked) { |
| 1871 | LOGP(DGPRS, LOGL_NOTICE, "Dropping PDU for " |
| 1872 | "blocked BVCI=%u via NSVC=%u/NSEI=%u\n", |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1873 | ns_bvci, nsvci, nsei); |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1874 | rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_DROPPED]); |
Harald Welte | 51b7d40 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 1875 | return bssgp_tx_status(BSSGP_CAUSE_BVCI_BLOCKED, NULL, msg); |
| 1876 | } |
| 1877 | rc = gbprox_relay2peer(msg, peer, ns_bvci); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1878 | } |
| 1879 | |
Harald Welte | f01709d | 2010-05-03 18:54:58 +0200 | [diff] [blame] | 1880 | return rc; |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1881 | } |
Harald Welte | b34e2c1 | 2010-05-11 05:49:43 +0200 | [diff] [blame] | 1882 | |
Harald Welte | 9ee404a | 2010-05-14 11:53:08 +0000 | [diff] [blame] | 1883 | int gbprox_reset_persistent_nsvcs(struct gprs_ns_inst *nsi) |
| 1884 | { |
| 1885 | struct gprs_nsvc *nsvc; |
| 1886 | |
| 1887 | llist_for_each_entry(nsvc, &nsi->gprs_nsvcs, list) { |
| 1888 | if (!nsvc->persistent) |
| 1889 | continue; |
| 1890 | gprs_nsvc_reset(nsvc, NS_CAUSE_OM_INTERVENTION); |
| 1891 | } |
| 1892 | return 0; |
| 1893 | } |
| 1894 | |
Harald Welte | 5bb0d36 | 2010-05-11 06:34:24 +0200 | [diff] [blame] | 1895 | /* Signal handler for signals from NS layer */ |
| 1896 | int gbprox_signal(unsigned int subsys, unsigned int signal, |
| 1897 | void *handler_data, void *signal_data) |
| 1898 | { |
| 1899 | struct ns_signal_data *nssd = signal_data; |
| 1900 | struct gprs_nsvc *nsvc = nssd->nsvc; |
| 1901 | struct gbprox_peer *peer; |
| 1902 | |
Harald Welte | 7ed98e3 | 2012-06-16 16:40:42 +0800 | [diff] [blame] | 1903 | if (subsys != SS_L_NS) |
Harald Welte | 5bb0d36 | 2010-05-11 06:34:24 +0200 | [diff] [blame] | 1904 | return 0; |
| 1905 | |
Harald Welte | 15cbb0e | 2010-05-11 18:29:44 +0200 | [diff] [blame] | 1906 | if (signal == S_NS_RESET && nsvc->nsei == gbcfg.nsip_sgsn_nsei) { |
| 1907 | /* We have received a NS-RESET from the NSEI and NSVC |
| 1908 | * of the SGSN. This might happen with SGSN that start |
| 1909 | * their own NS-RESET procedure without waiting for our |
| 1910 | * NS-RESET */ |
| 1911 | nsvc->remote_end_is_sgsn = 1; |
| 1912 | } |
| 1913 | |
Harald Welte | fa41cb7 | 2010-05-12 13:28:25 +0000 | [diff] [blame] | 1914 | if (signal == S_NS_ALIVE_EXP && nsvc->remote_end_is_sgsn) { |
| 1915 | LOGP(DGPRS, LOGL_NOTICE, "Tns alive expired too often, " |
| 1916 | "re-starting RESET procedure\n"); |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1917 | rate_ctr_inc(&get_global_ctrg()-> |
| 1918 | ctr[GBPROX_GLOB_CTR_RESTART_RESET_SGSN]); |
Harald Welte | a529c07 | 2012-06-17 12:25:53 +0800 | [diff] [blame] | 1919 | gprs_ns_nsip_connect(nsvc->nsi, &nsvc->ip.bts_addr, |
| 1920 | nsvc->nsei, nsvc->nsvci); |
Harald Welte | fa41cb7 | 2010-05-12 13:28:25 +0000 | [diff] [blame] | 1921 | } |
| 1922 | |
Harald Welte | db2a2d5 | 2011-02-06 16:33:29 +0100 | [diff] [blame] | 1923 | if (!nsvc->remote_end_is_sgsn) { |
| 1924 | /* from BSS to SGSN */ |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1925 | peer = peer_by_nsei(nsvc->nsei); |
Harald Welte | db2a2d5 | 2011-02-06 16:33:29 +0100 | [diff] [blame] | 1926 | if (!peer) { |
| 1927 | LOGP(DGPRS, LOGL_NOTICE, "signal %u for unknown peer " |
| 1928 | "NSEI=%u/NSVCI=%u\n", signal, nsvc->nsei, |
| 1929 | nsvc->nsvci); |
| 1930 | return 0; |
| 1931 | } |
Harald Welte | 5bb0d36 | 2010-05-11 06:34:24 +0200 | [diff] [blame] | 1932 | switch (signal) { |
| 1933 | case S_NS_RESET: |
Harald Welte | 5bb0d36 | 2010-05-11 06:34:24 +0200 | [diff] [blame] | 1934 | case S_NS_BLOCK: |
Harald Welte | db2a2d5 | 2011-02-06 16:33:29 +0100 | [diff] [blame] | 1935 | if (!peer->blocked) |
| 1936 | break; |
| 1937 | LOGP(DGPRS, LOGL_NOTICE, "Converting NS_RESET from " |
| 1938 | "NSEI=%u/NSVCI=%u into BSSGP_BVC_BLOCK to SGSN\n", |
| 1939 | nsvc->nsei, nsvc->nsvci); |
| 1940 | bssgp_tx_simple_bvci(BSSGP_PDUT_BVC_BLOCK, nsvc->nsei, |
| 1941 | peer->bvci, 0); |
Harald Welte | 5bb0d36 | 2010-05-11 06:34:24 +0200 | [diff] [blame] | 1942 | break; |
Harald Welte | db2a2d5 | 2011-02-06 16:33:29 +0100 | [diff] [blame] | 1943 | } |
| 1944 | } else { |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1945 | /* Forward this message to all NS-VC to BSS */ |
| 1946 | struct gprs_ns_inst *nsi = gbcfg.nsi; |
| 1947 | struct gprs_nsvc *next_nsvc; |
| 1948 | |
| 1949 | llist_for_each_entry(next_nsvc, &nsi->gprs_nsvcs, list) { |
| 1950 | if (next_nsvc->remote_end_is_sgsn) |
| 1951 | continue; |
| 1952 | |
| 1953 | /* Note that the following does not start the full |
| 1954 | * procedures including timer based retransmissions. */ |
Harald Welte | db2a2d5 | 2011-02-06 16:33:29 +0100 | [diff] [blame] | 1955 | switch (signal) { |
| 1956 | case S_NS_RESET: |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1957 | gprs_ns_tx_reset(next_nsvc, nssd->cause); |
Harald Welte | db2a2d5 | 2011-02-06 16:33:29 +0100 | [diff] [blame] | 1958 | break; |
| 1959 | case S_NS_BLOCK: |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1960 | gprs_ns_tx_block(next_nsvc, nssd->cause); |
Harald Welte | db2a2d5 | 2011-02-06 16:33:29 +0100 | [diff] [blame] | 1961 | break; |
| 1962 | case S_NS_UNBLOCK: |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1963 | gprs_ns_tx_unblock(next_nsvc); |
Harald Welte | db2a2d5 | 2011-02-06 16:33:29 +0100 | [diff] [blame] | 1964 | break; |
| 1965 | } |
Harald Welte | 5bb0d36 | 2010-05-11 06:34:24 +0200 | [diff] [blame] | 1966 | } |
| 1967 | } |
| 1968 | return 0; |
| 1969 | } |
| 1970 | |
Jacob Erlbeck | eed33ef | 2014-07-07 10:45:59 +0200 | [diff] [blame] | 1971 | int gbprox_dump_global(FILE *stream, int indent) |
Jacob Erlbeck | cc4a2aa | 2013-10-18 22:12:16 +0200 | [diff] [blame] | 1972 | { |
| 1973 | unsigned int i; |
| 1974 | const struct rate_ctr_group_desc *desc; |
| 1975 | int rc; |
| 1976 | |
| 1977 | rc = fprintf(stream, "%*sGbproxy global:\n", indent, ""); |
| 1978 | if (rc < 0) |
| 1979 | return rc; |
| 1980 | |
Jacob Erlbeck | cc4a2aa | 2013-10-18 22:12:16 +0200 | [diff] [blame] | 1981 | desc = get_global_ctrg()->desc; |
| 1982 | |
| 1983 | for (i = 0; i < desc->num_ctr; i++) { |
| 1984 | struct rate_ctr *ctr = &get_global_ctrg()->ctr[i]; |
| 1985 | if (ctr->current) { |
| 1986 | rc = fprintf(stream, "%*s %s: %llu\n", |
| 1987 | indent, "", |
| 1988 | desc->ctr_desc[i].description, |
| 1989 | (long long)ctr->current); |
| 1990 | |
| 1991 | if (rc < 0) |
| 1992 | return rc; |
| 1993 | } |
| 1994 | } |
| 1995 | |
| 1996 | return 0; |
| 1997 | } |
| 1998 | |
Jacob Erlbeck | eed33ef | 2014-07-07 10:45:59 +0200 | [diff] [blame] | 1999 | int gbprox_dump_peers(FILE *stream, int indent) |
Jacob Erlbeck | 76fa57a | 2013-10-15 12:00:26 +0200 | [diff] [blame] | 2000 | { |
| 2001 | struct gbprox_peer *peer; |
| 2002 | struct gprs_ra_id raid; |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 2003 | unsigned int i; |
| 2004 | const struct rate_ctr_group_desc *desc; |
Jacob Erlbeck | 76fa57a | 2013-10-15 12:00:26 +0200 | [diff] [blame] | 2005 | int rc; |
Jacob Erlbeck | 386621c | 2014-06-27 11:55:04 +0200 | [diff] [blame] | 2006 | time_t now = time(NULL); |
Jacob Erlbeck | 76fa57a | 2013-10-15 12:00:26 +0200 | [diff] [blame] | 2007 | |
Jacob Erlbeck | cc4a2aa | 2013-10-18 22:12:16 +0200 | [diff] [blame] | 2008 | rc = fprintf(stream, "%*sPeers:\n", indent, ""); |
| 2009 | if (rc < 0) |
| 2010 | return rc; |
| 2011 | |
Holger Hans Peter Freyther | 5eaf1a2 | 2014-08-04 11:10:09 +0200 | [diff] [blame^] | 2012 | llist_for_each_entry(peer, &gbcfg.bts_peers, list) { |
Jacob Erlbeck | 386621c | 2014-06-27 11:55:04 +0200 | [diff] [blame] | 2013 | struct gbprox_tlli_info *tlli_info; |
| 2014 | struct gbprox_patch_state *state = &peer->patch_state; |
Jacob Erlbeck | 76fa57a | 2013-10-15 12:00:26 +0200 | [diff] [blame] | 2015 | gsm48_parse_ra(&raid, peer->ra); |
| 2016 | |
| 2017 | rc = fprintf(stream, "%*s NSEI %u, BVCI %u, %sblocked, " |
Jacob Erlbeck | 9d7268a | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 2018 | "RAI %u-%u-%u-%u\n", |
Jacob Erlbeck | 76fa57a | 2013-10-15 12:00:26 +0200 | [diff] [blame] | 2019 | indent, "", |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 2020 | peer->nsei, peer->bvci, |
Jacob Erlbeck | 76fa57a | 2013-10-15 12:00:26 +0200 | [diff] [blame] | 2021 | peer->blocked ? "" : "not ", |
| 2022 | raid.mcc, raid.mnc, raid.lac, raid.rac); |
| 2023 | |
| 2024 | if (rc < 0) |
| 2025 | return rc; |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 2026 | |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 2027 | desc = peer->ctrg->desc; |
| 2028 | |
| 2029 | for (i = 0; i < desc->num_ctr; i++) { |
| 2030 | struct rate_ctr *ctr = &peer->ctrg->ctr[i]; |
| 2031 | if (ctr->current) { |
| 2032 | rc = fprintf(stream, "%*s %s: %llu\n", |
| 2033 | indent, "", |
| 2034 | desc->ctr_desc[i].description, |
| 2035 | (long long)ctr->current); |
| 2036 | |
| 2037 | if (rc < 0) |
| 2038 | return rc; |
| 2039 | } |
| 2040 | } |
Jacob Erlbeck | 386621c | 2014-06-27 11:55:04 +0200 | [diff] [blame] | 2041 | |
| 2042 | fprintf(stream, "%*s TLLI-Cache: %d\n", |
| 2043 | indent, "", state->enabled_tllis_count); |
| 2044 | llist_for_each_entry(tlli_info, &state->enabled_tllis, list) { |
| 2045 | char mi_buf[200]; |
| 2046 | time_t age = now - tlli_info->timestamp; |
| 2047 | snprintf(mi_buf, sizeof(mi_buf), "(invalid)"); |
| 2048 | gsm48_mi_to_string(mi_buf, sizeof(mi_buf), |
| 2049 | tlli_info->mi_data, |
| 2050 | tlli_info->mi_data_len); |
| 2051 | rc = fprintf(stream, |
| 2052 | "%*s TLLI %08x, IMSI %s, AGE %d\n", |
| 2053 | indent, "", |
| 2054 | tlli_info->tlli, mi_buf, (int)age); |
| 2055 | if (rc < 0) |
| 2056 | return rc; |
| 2057 | } |
Jacob Erlbeck | 76fa57a | 2013-10-15 12:00:26 +0200 | [diff] [blame] | 2058 | } |
| 2059 | |
| 2060 | return 0; |
| 2061 | } |
Harald Welte | b34e2c1 | 2010-05-11 05:49:43 +0200 | [diff] [blame] | 2062 | |
Jacob Erlbeck | 67f03bd | 2013-10-24 12:48:55 +0200 | [diff] [blame] | 2063 | void gbprox_reset() |
| 2064 | { |
| 2065 | struct gbprox_peer *peer, *tmp; |
| 2066 | |
Holger Hans Peter Freyther | 5eaf1a2 | 2014-08-04 11:10:09 +0200 | [diff] [blame^] | 2067 | llist_for_each_entry_safe(peer, tmp, &gbcfg.bts_peers, list) |
Jacob Erlbeck | 67f03bd | 2013-10-24 12:48:55 +0200 | [diff] [blame] | 2068 | peer_free(peer); |
| 2069 | |
| 2070 | rate_ctr_group_free(global_ctrg); |
| 2071 | global_ctrg = NULL; |
| 2072 | } |
| 2073 | |
Holger Hans Peter Freyther | 5eaf1a2 | 2014-08-04 11:10:09 +0200 | [diff] [blame^] | 2074 | int gbprox_cleanup_peers(uint16_t nsei, uint16_t bvci) |
Jacob Erlbeck | 7fee972 | 2013-10-24 12:48:23 +0200 | [diff] [blame] | 2075 | { |
| 2076 | int counter = 0; |
| 2077 | struct gbprox_peer *peer, *tmp; |
| 2078 | |
Holger Hans Peter Freyther | 5eaf1a2 | 2014-08-04 11:10:09 +0200 | [diff] [blame^] | 2079 | llist_for_each_entry_safe(peer, tmp, &gbcfg.bts_peers, list) { |
Jacob Erlbeck | 7fee972 | 2013-10-24 12:48:23 +0200 | [diff] [blame] | 2080 | if (peer->nsei != nsei) |
| 2081 | continue; |
| 2082 | if (bvci && peer->bvci != bvci) |
| 2083 | continue; |
| 2084 | |
| 2085 | peer_free(peer); |
| 2086 | counter += 1; |
| 2087 | } |
| 2088 | |
| 2089 | return counter; |
| 2090 | } |
| 2091 | |
Holger Hans Peter Freyther | 5eaf1a2 | 2014-08-04 11:10:09 +0200 | [diff] [blame^] | 2092 | int gbproxy_init_config(struct gbproxy_config *cfg) |
Jacob Erlbeck | 7fee972 | 2013-10-24 12:48:23 +0200 | [diff] [blame] | 2093 | { |
Holger Hans Peter Freyther | 5eaf1a2 | 2014-08-04 11:10:09 +0200 | [diff] [blame^] | 2094 | INIT_LLIST_HEAD(&cfg->bts_peers); |
| 2095 | return 0; |
Jacob Erlbeck | 7fee972 | 2013-10-24 12:48:23 +0200 | [diff] [blame] | 2096 | } |