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> |
Holger Hans Peter Freyther | 8ac3a72 | 2014-08-04 11:52:52 +0200 | [diff] [blame] | 50 | #include <openbsc/gprs_utils.h> |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 51 | |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 52 | enum gbprox_global_ctr { |
| 53 | GBPROX_GLOB_CTR_INV_BVCI, |
Jacob Erlbeck | 9d7268a | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 54 | GBPROX_GLOB_CTR_INV_LAI, |
| 55 | GBPROX_GLOB_CTR_INV_RAI, |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 56 | GBPROX_GLOB_CTR_INV_NSEI, |
| 57 | GBPROX_GLOB_CTR_PROTO_ERR_BSS, |
| 58 | GBPROX_GLOB_CTR_PROTO_ERR_SGSN, |
| 59 | GBPROX_GLOB_CTR_NOT_SUPPORTED_BSS, |
| 60 | GBPROX_GLOB_CTR_NOT_SUPPORTED_SGSN, |
| 61 | GBPROX_GLOB_CTR_RESTART_RESET_SGSN, |
| 62 | GBPROX_GLOB_CTR_TX_ERR_SGSN, |
| 63 | GBPROX_GLOB_CTR_OTHER_ERR, |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 64 | GBPROX_GLOB_CTR_PATCH_PEER_ERR, |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 65 | }; |
| 66 | |
| 67 | static const struct rate_ctr_desc global_ctr_description[] = { |
| 68 | { "inv-bvci", "Invalid BVC Identifier " }, |
Jacob Erlbeck | 9d7268a | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 69 | { "inv-lai", "Invalid Location Area Identifier" }, |
| 70 | { "inv-rai", "Invalid Routing Area Identifier " }, |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 71 | { "inv-nsei", "No BVC established for NSEI " }, |
| 72 | { "proto-err.bss", "BSSGP protocol error (BSS )" }, |
| 73 | { "proto-err.sgsn", "BSSGP protocol error (SGSN)" }, |
| 74 | { "not-supp.bss", "Feature not supported (BSS )" }, |
| 75 | { "not-supp.sgsn", "Feature not supported (SGSN)" }, |
| 76 | { "restart.sgsn", "Restarted RESET procedure (SGSN)" }, |
| 77 | { "tx-err.sgsn", "NS Transmission error (SGSN)" }, |
| 78 | { "error", "Other error " }, |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 79 | { "mod-peer-err", "Patch error: no peer " }, |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 80 | }; |
| 81 | |
| 82 | static const struct rate_ctr_group_desc global_ctrg_desc = { |
| 83 | .group_name_prefix = "gbproxy.global", |
| 84 | .group_description = "GBProxy Global Statistics", |
| 85 | .num_ctr = ARRAY_SIZE(global_ctr_description), |
| 86 | .ctr_desc = global_ctr_description, |
| 87 | }; |
| 88 | |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 89 | enum gbprox_peer_ctr { |
| 90 | GBPROX_PEER_CTR_BLOCKED, |
| 91 | GBPROX_PEER_CTR_UNBLOCKED, |
| 92 | GBPROX_PEER_CTR_DROPPED, |
| 93 | GBPROX_PEER_CTR_INV_NSEI, |
| 94 | GBPROX_PEER_CTR_TX_ERR, |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 95 | GBPROX_PEER_CTR_RAID_PATCHED_BSS, |
| 96 | GBPROX_PEER_CTR_RAID_PATCHED_SGSN, |
| 97 | GBPROX_PEER_CTR_APN_PATCHED, |
| 98 | GBPROX_PEER_CTR_PATCH_CRYPT_ERR, |
| 99 | GBPROX_PEER_CTR_PATCH_ERR, |
Jacob Erlbeck | 481da7c | 2014-06-27 10:44:46 +0200 | [diff] [blame] | 100 | GBPROX_PEER_CTR_ATTACH_REQS, |
| 101 | GBPROX_PEER_CTR_ATTACH_REJS, |
| 102 | GBPROX_PEER_CTR_TLLI_CACHE_SIZE, |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 103 | }; |
| 104 | |
| 105 | static const struct rate_ctr_desc peer_ctr_description[] = { |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 106 | { "blocked", "BVC Block " }, |
| 107 | { "unblocked", "BVC Unblock " }, |
| 108 | { "dropped", "BVC blocked, dropped packet " }, |
| 109 | { "inv-nsei", "NSEI mismatch " }, |
| 110 | { "tx-err", "NS Transmission error " }, |
| 111 | { "raid-mod.bss", "RAID patched (BSS )" }, |
| 112 | { "raid-mod.sgsn", "RAID patched (SGSN)" }, |
| 113 | { "apn-mod.sgsn", "APN patched " }, |
| 114 | { "mod-crypt-err", "Patch error: encrypted " }, |
| 115 | { "mod-err", "Patch error: other " }, |
Jacob Erlbeck | 481da7c | 2014-06-27 10:44:46 +0200 | [diff] [blame] | 116 | { "attach-reqs", "Attach Request count " }, |
| 117 | { "attach-rejs", "Attach Reject count " }, |
| 118 | { "tlli-cache", "TLLI cache size " }, |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 119 | }; |
| 120 | |
| 121 | static const struct rate_ctr_group_desc peer_ctrg_desc = { |
| 122 | .group_name_prefix = "gbproxy.peer", |
| 123 | .group_description = "GBProxy Peer Statistics", |
| 124 | .num_ctr = ARRAY_SIZE(peer_ctr_description), |
| 125 | .ctr_desc = peer_ctr_description, |
| 126 | }; |
| 127 | |
Holger Hans Peter Freyther | d64bf22 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 128 | static void gbprox_delete_tllis(struct gbproxy_peer *peer); |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 129 | |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 130 | /* Find the gbprox_peer by its BVCI */ |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 131 | static struct gbproxy_peer *peer_by_bvci(struct gbproxy_config *cfg, uint16_t bvci) |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 132 | { |
Holger Hans Peter Freyther | d64bf22 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 133 | struct gbproxy_peer *peer; |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 134 | llist_for_each_entry(peer, &cfg->bts_peers, list) { |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 135 | if (peer->bvci == bvci) |
| 136 | return peer; |
| 137 | } |
| 138 | return NULL; |
| 139 | } |
| 140 | |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 141 | /* Find the gbprox_peer by its NSEI */ |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 142 | struct gbproxy_peer *gbprox_peer_by_nsei(struct gbproxy_config *cfg, uint16_t nsei) |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 143 | { |
Holger Hans Peter Freyther | d64bf22 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 144 | struct gbproxy_peer *peer; |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 145 | llist_for_each_entry(peer, &cfg->bts_peers, list) { |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 146 | if (peer->nsei == nsei) |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 147 | return peer; |
| 148 | } |
| 149 | return NULL; |
| 150 | } |
| 151 | |
Jacob Erlbeck | 9d7268a | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 152 | /* look-up a peer by its Routeing Area Identification (RAI) */ |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 153 | static struct gbproxy_peer *peer_by_rai(struct gbproxy_config *cfg, const uint8_t *ra) |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 154 | { |
Holger Hans Peter Freyther | d64bf22 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 155 | struct gbproxy_peer *peer; |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 156 | llist_for_each_entry(peer, &cfg->bts_peers, list) { |
Harald Welte | 8ba9d2d | 2010-05-12 00:07:29 +0200 | [diff] [blame] | 157 | if (!memcmp(peer->ra, ra, 6)) |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 158 | return peer; |
| 159 | } |
| 160 | return NULL; |
| 161 | } |
| 162 | |
Jacob Erlbeck | 9d7268a | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 163 | /* look-up a peer by its Location Area Identification (LAI) */ |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 164 | static struct gbproxy_peer *peer_by_lai(struct gbproxy_config *cfg, const uint8_t *la) |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 165 | { |
Holger Hans Peter Freyther | d64bf22 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 166 | struct gbproxy_peer *peer; |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 167 | llist_for_each_entry(peer, &cfg->bts_peers, list) { |
Harald Welte | 8ba9d2d | 2010-05-12 00:07:29 +0200 | [diff] [blame] | 168 | if (!memcmp(peer->ra, la, 5)) |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 169 | return peer; |
| 170 | } |
| 171 | return NULL; |
| 172 | } |
| 173 | |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 174 | /* look-up a peer by its Location Area Code (LAC) */ |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 175 | static struct gbproxy_peer *peer_by_lac(struct gbproxy_config *cfg, const uint8_t *la) |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 176 | { |
Holger Hans Peter Freyther | d64bf22 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 177 | struct gbproxy_peer *peer; |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 178 | llist_for_each_entry(peer, &cfg->bts_peers, list) { |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 179 | if (!memcmp(peer->ra + 3, la + 3, 2)) |
| 180 | return peer; |
| 181 | } |
| 182 | return NULL; |
| 183 | } |
| 184 | |
| 185 | |
Holger Hans Peter Freyther | d64bf22 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 186 | static int check_peer_nsei(struct gbproxy_peer *peer, uint16_t nsei) |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 187 | { |
| 188 | if (peer->nsei != nsei) { |
| 189 | LOGP(DGPRS, LOGL_NOTICE, "Peer entry doesn't match current NSEI " |
| 190 | "BVCI=%u via NSEI=%u (expected NSEI=%u)\n", |
| 191 | peer->bvci, nsei, peer->nsei); |
| 192 | rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_INV_NSEI]); |
Jacob Erlbeck | d0a9b50 | 2013-10-24 12:48:56 +0200 | [diff] [blame] | 193 | return 0; |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 194 | } |
| 195 | |
Jacob Erlbeck | d0a9b50 | 2013-10-24 12:48:56 +0200 | [diff] [blame] | 196 | return 1; |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 197 | } |
| 198 | |
Holger Hans Peter Freyther | 60fa5b9 | 2014-08-04 17:10:08 +0200 | [diff] [blame] | 199 | struct gbproxy_peer *gbproxy_peer_alloc(struct gbproxy_config *cfg, uint16_t bvci) |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 200 | { |
Holger Hans Peter Freyther | d64bf22 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 201 | struct gbproxy_peer *peer; |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 202 | |
Holger Hans Peter Freyther | d64bf22 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 203 | peer = talloc_zero(tall_bsc_ctx, struct gbproxy_peer); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 204 | if (!peer) |
| 205 | return NULL; |
| 206 | |
| 207 | peer->bvci = bvci; |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 208 | peer->ctrg = rate_ctr_group_alloc(peer, &peer_ctrg_desc, bvci); |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 209 | peer->cfg = cfg; |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 210 | |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 211 | llist_add(&peer->list, &cfg->bts_peers); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 212 | |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 213 | INIT_LLIST_HEAD(&peer->patch_state.enabled_tllis); |
| 214 | |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 215 | return peer; |
| 216 | } |
| 217 | |
Holger Hans Peter Freyther | 60fa5b9 | 2014-08-04 17:10:08 +0200 | [diff] [blame] | 218 | void gbproxy_peer_free(struct gbproxy_peer *peer) |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 219 | { |
| 220 | llist_del(&peer->list); |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 221 | |
| 222 | gbprox_delete_tllis(peer); |
| 223 | |
Jacob Erlbeck | 985b46e | 2014-08-07 17:23:00 +0200 | [diff] [blame] | 224 | rate_ctr_group_free(peer->ctrg); |
| 225 | peer->ctrg = NULL; |
| 226 | |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 227 | talloc_free(peer); |
| 228 | } |
| 229 | |
Harald Welte | 3ad3243 | 2010-05-03 19:05:10 +0200 | [diff] [blame] | 230 | /* strip off the NS header */ |
| 231 | static void strip_ns_hdr(struct msgb *msg) |
| 232 | { |
| 233 | int strip_len = msgb_bssgph(msg) - msg->data; |
| 234 | msgb_pull(msg, strip_len); |
| 235 | } |
| 236 | |
Jacob Erlbeck | 077abce | 2014-07-01 12:41:13 +0200 | [diff] [blame] | 237 | /* TODO: Move shift functions to libosmocore */ |
| 238 | |
| 239 | int v_fixed_shift(uint8_t **data, size_t *data_len, |
| 240 | size_t len, uint8_t **value) |
| 241 | { |
| 242 | if (len > *data_len) |
| 243 | goto fail; |
| 244 | |
| 245 | if (value) |
| 246 | *value = *data; |
| 247 | |
| 248 | *data += len; |
| 249 | *data_len -= len; |
| 250 | |
| 251 | return len; |
| 252 | |
| 253 | fail: |
| 254 | *data += *data_len; |
| 255 | *data_len = 0; |
| 256 | return -1; |
| 257 | } |
| 258 | |
| 259 | int tv_fixed_match(uint8_t **data, size_t *data_len, |
| 260 | uint8_t tag, size_t len, |
| 261 | uint8_t **value) |
| 262 | { |
| 263 | size_t ie_len; |
| 264 | |
| 265 | if (*data_len == 0) |
| 266 | goto fail; |
| 267 | |
| 268 | if ((*data)[0] != tag) |
| 269 | return 0; |
| 270 | |
| 271 | if (len > *data_len - 1) |
| 272 | goto fail; |
| 273 | |
| 274 | if (value) |
| 275 | *value = *data + 1; |
| 276 | |
| 277 | ie_len = len + 1; |
| 278 | *data += ie_len; |
| 279 | *data_len -= ie_len; |
| 280 | |
| 281 | return ie_len; |
| 282 | |
| 283 | fail: |
| 284 | *data += *data_len; |
| 285 | *data_len = 0; |
| 286 | return -1; |
| 287 | } |
| 288 | |
| 289 | int tlv_match(uint8_t **data, size_t *data_len, |
| 290 | uint8_t tag, uint8_t **value, size_t *value_len) |
| 291 | { |
| 292 | size_t len; |
| 293 | size_t ie_len; |
| 294 | |
| 295 | if (*data_len < 2) |
| 296 | goto fail; |
| 297 | |
| 298 | if ((*data)[0] != tag) |
| 299 | return 0; |
| 300 | |
| 301 | len = (*data)[1]; |
| 302 | if (len > *data_len - 2) |
| 303 | goto fail; |
| 304 | |
| 305 | if (value) |
| 306 | *value = *data + 2; |
| 307 | if (value_len) |
| 308 | *value_len = len; |
| 309 | |
| 310 | ie_len = len + 2; |
| 311 | |
| 312 | *data += ie_len; |
| 313 | *data_len -= ie_len; |
| 314 | |
| 315 | return ie_len; |
| 316 | |
| 317 | fail: |
| 318 | *data += *data_len; |
| 319 | *data_len = 0; |
| 320 | return -1; |
| 321 | } |
| 322 | |
| 323 | int lv_shift(uint8_t **data, size_t *data_len, |
| 324 | uint8_t **value, size_t *value_len) |
| 325 | { |
| 326 | size_t len; |
| 327 | size_t ie_len; |
| 328 | |
| 329 | if (*data_len < 1) |
| 330 | goto fail; |
| 331 | |
| 332 | len = (*data)[0]; |
| 333 | if (len > *data_len - 1) |
| 334 | goto fail; |
| 335 | |
| 336 | if (value) |
| 337 | *value = *data + 1; |
| 338 | if (value_len) |
| 339 | *value_len = len; |
| 340 | |
| 341 | ie_len = len + 1; |
| 342 | *data += ie_len; |
| 343 | *data_len -= ie_len; |
| 344 | |
| 345 | return ie_len; |
| 346 | |
| 347 | fail: |
| 348 | *data += *data_len; |
| 349 | *data_len = 0; |
| 350 | return -1; |
| 351 | } |
| 352 | |
Jacob Erlbeck | e39a1c9 | 2014-08-07 13:11:34 +0200 | [diff] [blame] | 353 | /* GSM 04.08, 10.5.1.4 */ |
| 354 | static int is_mi_tmsi(const uint8_t *value, size_t value_len) |
Jacob Erlbeck | 3b66d85 | 2014-08-05 15:53:43 +0200 | [diff] [blame] | 355 | { |
| 356 | if (value_len != GSM48_TMSI_LEN) |
| 357 | return 0; |
| 358 | |
Jacob Erlbeck | b679977 | 2014-08-07 10:46:29 +0200 | [diff] [blame] | 359 | if (!value || (value[0] & GSM_MI_TYPE_MASK) != GSM_MI_TYPE_TMSI) |
Jacob Erlbeck | 3b66d85 | 2014-08-05 15:53:43 +0200 | [diff] [blame] | 360 | return 0; |
| 361 | |
| 362 | return 1; |
| 363 | } |
| 364 | |
Jacob Erlbeck | e39a1c9 | 2014-08-07 13:11:34 +0200 | [diff] [blame] | 365 | /* GSM 04.08, 10.5.1.4 */ |
| 366 | static int is_mi_imsi(const uint8_t *value, size_t value_len) |
Jacob Erlbeck | dc6dcdf | 2014-08-06 15:16:45 +0200 | [diff] [blame] | 367 | { |
| 368 | if (value_len == 0) |
| 369 | return 0; |
| 370 | |
Jacob Erlbeck | b679977 | 2014-08-07 10:46:29 +0200 | [diff] [blame] | 371 | if (!value || (value[0] & GSM_MI_TYPE_MASK) != GSM_MI_TYPE_IMSI) |
Jacob Erlbeck | dc6dcdf | 2014-08-06 15:16:45 +0200 | [diff] [blame] | 372 | return 0; |
| 373 | |
| 374 | return 1; |
| 375 | } |
| 376 | |
Jacob Erlbeck | e39a1c9 | 2014-08-07 13:11:34 +0200 | [diff] [blame] | 377 | static int parse_mi_tmsi(const uint8_t *value, size_t value_len, uint32_t *tmsi) |
Jacob Erlbeck | f5b2085 | 2014-06-27 18:10:53 +0200 | [diff] [blame] | 378 | { |
| 379 | uint32_t tmsi_be; |
| 380 | |
Jacob Erlbeck | 3b66d85 | 2014-08-05 15:53:43 +0200 | [diff] [blame] | 381 | if (!is_mi_tmsi(value, value_len)) |
Jacob Erlbeck | f5b2085 | 2014-06-27 18:10:53 +0200 | [diff] [blame] | 382 | return 0; |
| 383 | |
| 384 | memcpy(&tmsi_be, value + 1, sizeof(tmsi_be)); |
| 385 | |
| 386 | *tmsi = ntohl(tmsi_be); |
Jacob Erlbeck | f5b2085 | 2014-06-27 18:10:53 +0200 | [diff] [blame] | 387 | return 1; |
| 388 | } |
| 389 | |
Holger Hans Peter Freyther | d64bf22 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 390 | struct gbproxy_parse_context { |
Jacob Erlbeck | f40a6c9 | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 391 | /* Pointer to protocol specific parts */ |
| 392 | struct gsm48_hdr *g48_hdr; |
Jacob Erlbeck | 4dc663f | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 393 | struct bssgp_normal_hdr *bgp_hdr; |
Jacob Erlbeck | f40a6c9 | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 394 | struct bssgp_ud_hdr *bud_hdr; |
Jacob Erlbeck | 4dc663f | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 395 | uint8_t *bssgp_data; |
| 396 | size_t bssgp_data_len; |
| 397 | uint8_t *llc; |
| 398 | size_t llc_len; |
Jacob Erlbeck | f40a6c9 | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 399 | |
| 400 | /* Extracted information */ |
Jacob Erlbeck | 4dc663f | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 401 | struct gprs_llc_hdr_parsed llc_hdr_parsed; |
| 402 | struct tlv_parsed bssgp_tp; |
Jacob Erlbeck | f40a6c9 | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 403 | int to_bss; |
Jacob Erlbeck | 4dc663f | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 404 | uint8_t *tlli_enc; |
| 405 | uint8_t *imsi; |
Jacob Erlbeck | f40a6c9 | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 406 | size_t imsi_len; |
Jacob Erlbeck | 3b66d85 | 2014-08-05 15:53:43 +0200 | [diff] [blame] | 407 | uint8_t *apn_ie; |
| 408 | size_t apn_ie_len; |
| 409 | uint8_t *ptmsi_enc; |
Jacob Erlbeck | dc6dcdf | 2014-08-06 15:16:45 +0200 | [diff] [blame] | 410 | uint8_t *new_ptmsi_enc; |
Jacob Erlbeck | 3b66d85 | 2014-08-05 15:53:43 +0200 | [diff] [blame] | 411 | uint8_t *raid_enc; |
Jacob Erlbeck | 4dc663f | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 412 | uint8_t *bssgp_raid_enc; |
| 413 | uint8_t *bssgp_ptimsi; |
Jacob Erlbeck | 3b66d85 | 2014-08-05 15:53:43 +0200 | [diff] [blame] | 414 | |
| 415 | /* General info */ |
| 416 | const char *llc_msg_name; |
| 417 | int invalidate_tlli; |
Jacob Erlbeck | 4dc663f | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 418 | int need_decryption; |
| 419 | uint32_t tlli; |
| 420 | int pdu_type; |
Jacob Erlbeck | f40a6c9 | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 421 | }; |
| 422 | |
Holger Hans Peter Freyther | d64bf22 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 423 | static struct gbproxy_tlli_info *gbprox_find_tlli(struct gbproxy_peer *peer, |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 424 | uint32_t tlli) |
| 425 | { |
Holger Hans Peter Freyther | d64bf22 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 426 | struct gbproxy_tlli_info *tlli_info; |
| 427 | struct gbproxy_patch_state *state = &peer->patch_state; |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 428 | |
| 429 | llist_for_each_entry(tlli_info, &state->enabled_tllis, list) |
| 430 | if (tlli_info->tlli == tlli) |
| 431 | return tlli_info; |
| 432 | |
| 433 | return NULL; |
| 434 | } |
| 435 | |
Holger Hans Peter Freyther | 60fa5b9 | 2014-08-04 17:10:08 +0200 | [diff] [blame] | 436 | struct gbproxy_tlli_info *gbprox_find_tlli_by_mi( |
Holger Hans Peter Freyther | d64bf22 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 437 | struct gbproxy_peer *peer, |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 438 | const uint8_t *mi_data, |
| 439 | size_t mi_data_len) |
| 440 | { |
Holger Hans Peter Freyther | d64bf22 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 441 | struct gbproxy_tlli_info *tlli_info; |
| 442 | struct gbproxy_patch_state *state = &peer->patch_state; |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 443 | |
Jacob Erlbeck | 9ac42ba | 2014-08-06 18:55:15 +0200 | [diff] [blame] | 444 | if (!is_mi_imsi(mi_data, mi_data_len)) |
| 445 | return NULL; |
| 446 | |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 447 | llist_for_each_entry(tlli_info, &state->enabled_tllis, list) { |
| 448 | if (tlli_info->mi_data_len != mi_data_len) |
| 449 | continue; |
| 450 | if (memcmp(tlli_info->mi_data, mi_data, mi_data_len) != 0) |
| 451 | continue; |
| 452 | |
| 453 | return tlli_info; |
| 454 | } |
| 455 | |
| 456 | return NULL; |
| 457 | } |
| 458 | |
Holger Hans Peter Freyther | d64bf22 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 459 | void gbprox_delete_tlli(struct gbproxy_peer *peer, |
| 460 | struct gbproxy_tlli_info *tlli_info) |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 461 | { |
Holger Hans Peter Freyther | d64bf22 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 462 | struct gbproxy_patch_state *state = &peer->patch_state; |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 463 | |
| 464 | llist_del(&tlli_info->list); |
| 465 | talloc_free(tlli_info); |
| 466 | state->enabled_tllis_count -= 1; |
Jacob Erlbeck | 985b46e | 2014-08-07 17:23:00 +0200 | [diff] [blame] | 467 | |
| 468 | peer->ctrg->ctr[GBPROX_PEER_CTR_TLLI_CACHE_SIZE].current = |
| 469 | state->enabled_tllis_count; |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 470 | } |
| 471 | |
Holger Hans Peter Freyther | d64bf22 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 472 | static void gbprox_delete_tllis(struct gbproxy_peer *peer) |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 473 | { |
Holger Hans Peter Freyther | d64bf22 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 474 | struct gbproxy_tlli_info *tlli_info, *nxt; |
| 475 | struct gbproxy_patch_state *state = &peer->patch_state; |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 476 | |
Holger Hans Peter Freyther | c120d11 | 2014-08-04 12:18:07 +0200 | [diff] [blame] | 477 | llist_for_each_entry_safe(tlli_info, nxt, &state->enabled_tllis, list) |
| 478 | gbprox_delete_tlli(peer, tlli_info); |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 479 | |
Holger Hans Peter Freyther | c120d11 | 2014-08-04 12:18:07 +0200 | [diff] [blame] | 480 | OSMO_ASSERT(state->enabled_tllis_count == 0); |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 481 | OSMO_ASSERT(llist_empty(&state->enabled_tllis)); |
| 482 | } |
| 483 | |
Holger Hans Peter Freyther | 5e94f7f | 2014-08-04 16:27:11 +0200 | [diff] [blame] | 484 | int gbprox_set_patch_filter(struct gbproxy_config *cfg, const char *filter, |
| 485 | const char **err_msg) |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 486 | { |
| 487 | static char err_buf[300]; |
| 488 | int rc; |
| 489 | |
Holger Hans Peter Freyther | 5e94f7f | 2014-08-04 16:27:11 +0200 | [diff] [blame] | 490 | if (cfg->check_imsi) { |
| 491 | regfree(&cfg->imsi_re_comp); |
| 492 | cfg->check_imsi = 0; |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 493 | } |
| 494 | |
| 495 | if (!filter) |
| 496 | return 0; |
| 497 | |
Holger Hans Peter Freyther | 5e94f7f | 2014-08-04 16:27:11 +0200 | [diff] [blame] | 498 | rc = regcomp(&cfg->imsi_re_comp, filter, |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 499 | REG_EXTENDED | REG_NOSUB | REG_ICASE); |
| 500 | |
| 501 | if (rc == 0) { |
Holger Hans Peter Freyther | 5e94f7f | 2014-08-04 16:27:11 +0200 | [diff] [blame] | 502 | cfg->check_imsi = 1; |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 503 | return 0; |
| 504 | } |
| 505 | |
| 506 | if (err_msg) { |
Holger Hans Peter Freyther | 5e94f7f | 2014-08-04 16:27:11 +0200 | [diff] [blame] | 507 | regerror(rc, &cfg->imsi_re_comp, |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 508 | err_buf, sizeof(err_buf)); |
| 509 | *err_msg = err_buf; |
| 510 | } |
| 511 | |
| 512 | return -1; |
| 513 | } |
| 514 | |
Jacob Erlbeck | b679977 | 2014-08-07 10:46:29 +0200 | [diff] [blame] | 515 | int gbprox_check_imsi(struct gbproxy_peer *peer, |
| 516 | const uint8_t *imsi, size_t imsi_len) |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 517 | { |
| 518 | char mi_buf[200]; |
| 519 | int rc; |
| 520 | |
Holger Hans Peter Freyther | 5e94f7f | 2014-08-04 16:27:11 +0200 | [diff] [blame] | 521 | if (!peer->cfg->check_imsi) |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 522 | return 1; |
| 523 | |
Jacob Erlbeck | b679977 | 2014-08-07 10:46:29 +0200 | [diff] [blame] | 524 | rc = is_mi_imsi(imsi, imsi_len); |
| 525 | if (rc > 0) |
| 526 | rc = gsm48_mi_to_string(mi_buf, sizeof(mi_buf), imsi, imsi_len); |
| 527 | if (rc <= 0) { |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 528 | LOGP(DGPRS, LOGL_NOTICE, "Invalid IMSI %s\n", |
| 529 | osmo_hexdump(imsi, imsi_len)); |
| 530 | return -1; |
| 531 | } |
| 532 | |
| 533 | LOGP(DGPRS, LOGL_DEBUG, "Checking IMSI '%s' (%d)\n", mi_buf, rc); |
| 534 | |
Holger Hans Peter Freyther | 5e94f7f | 2014-08-04 16:27:11 +0200 | [diff] [blame] | 535 | rc = regexec(&peer->cfg->imsi_re_comp, mi_buf, 0, NULL, 0); |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 536 | if (rc == REG_NOMATCH) { |
| 537 | LOGP(DGPRS, LOGL_INFO, |
| 538 | "IMSI '%s' doesn't match pattern '%s'\n", |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 539 | mi_buf, peer->cfg->match_re); |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 540 | return 0; |
| 541 | } |
| 542 | |
| 543 | return 1; |
| 544 | } |
| 545 | |
Jacob Erlbeck | 6d9118f | 2014-07-03 15:52:49 +0200 | [diff] [blame] | 546 | static void gbprox_attach_tlli_info(struct gbproxy_peer *peer, time_t now, |
| 547 | struct gbproxy_tlli_info *tlli_info) |
| 548 | { |
| 549 | struct gbproxy_patch_state *state = &peer->patch_state; |
| 550 | |
| 551 | tlli_info->timestamp = now; |
| 552 | llist_add(&tlli_info->list, &state->enabled_tllis); |
| 553 | state->enabled_tllis_count += 1; |
Jacob Erlbeck | 985b46e | 2014-08-07 17:23:00 +0200 | [diff] [blame] | 554 | |
| 555 | peer->ctrg->ctr[GBPROX_PEER_CTR_TLLI_CACHE_SIZE].current = |
| 556 | state->enabled_tllis_count; |
Jacob Erlbeck | 6d9118f | 2014-07-03 15:52:49 +0200 | [diff] [blame] | 557 | } |
| 558 | |
Holger Hans Peter Freyther | d64bf22 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 559 | int gbprox_remove_stale_tllis(struct gbproxy_peer *peer, time_t now) |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 560 | { |
Holger Hans Peter Freyther | d64bf22 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 561 | struct gbproxy_patch_state *state = &peer->patch_state; |
Jacob Erlbeck | cefe85c | 2014-08-07 18:35:30 +0200 | [diff] [blame] | 562 | int exceeded_max_len = 0; |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 563 | int deleted_count = 0; |
Jacob Erlbeck | cefe85c | 2014-08-07 18:35:30 +0200 | [diff] [blame] | 564 | int check_for_age; |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 565 | |
Jacob Erlbeck | cefe85c | 2014-08-07 18:35:30 +0200 | [diff] [blame] | 566 | if (peer->cfg->tlli_max_len > 0) |
| 567 | exceeded_max_len = |
| 568 | state->enabled_tllis_count - peer->cfg->tlli_max_len; |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 569 | |
Jacob Erlbeck | cefe85c | 2014-08-07 18:35:30 +0200 | [diff] [blame] | 570 | check_for_age = peer->cfg->tlli_max_age > 0; |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 571 | |
Jacob Erlbeck | cefe85c | 2014-08-07 18:35:30 +0200 | [diff] [blame] | 572 | for (; exceeded_max_len > 0; exceeded_max_len--) { |
| 573 | struct gbproxy_tlli_info *tlli_info; |
| 574 | OSMO_ASSERT(!llist_empty(&state->enabled_tllis)); |
| 575 | tlli_info = llist_entry(state->enabled_tllis.prev, |
| 576 | struct gbproxy_tlli_info, |
| 577 | list); |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 578 | LOGP(DGPRS, LOGL_INFO, |
Jacob Erlbeck | cefe85c | 2014-08-07 18:35:30 +0200 | [diff] [blame] | 579 | "Removing TLLI %08x from list " |
| 580 | "(stale, length %d, max_len exceeded)\n", |
| 581 | tlli_info->tlli, state->enabled_tllis_count); |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 582 | |
| 583 | gbprox_delete_tlli(peer, tlli_info); |
Jacob Erlbeck | cefe85c | 2014-08-07 18:35:30 +0200 | [diff] [blame] | 584 | deleted_count += 1; |
| 585 | } |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 586 | |
Jacob Erlbeck | cefe85c | 2014-08-07 18:35:30 +0200 | [diff] [blame] | 587 | while (check_for_age && !llist_empty(&state->enabled_tllis)) { |
| 588 | time_t age; |
| 589 | struct gbproxy_tlli_info *tlli_info; |
| 590 | tlli_info = llist_entry(state->enabled_tllis.prev, |
| 591 | struct gbproxy_tlli_info, |
| 592 | list); |
| 593 | age = now - tlli_info->timestamp; |
| 594 | /* age < 0 only happens after system time jumps, discard entry */ |
| 595 | if (age <= peer->cfg->tlli_max_age && age >= 0) { |
| 596 | check_for_age = 0; |
| 597 | continue; |
| 598 | } |
| 599 | |
| 600 | LOGP(DGPRS, LOGL_INFO, |
| 601 | "Removing TLLI %08x from list " |
| 602 | "(stale, age %d, max_age exceeded)\n", |
| 603 | tlli_info->tlli, (int)age); |
| 604 | |
| 605 | gbprox_delete_tlli(peer, tlli_info); |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 606 | deleted_count += 1; |
| 607 | } |
| 608 | |
| 609 | return deleted_count; |
| 610 | } |
| 611 | |
Jacob Erlbeck | 6d9118f | 2014-07-03 15:52:49 +0200 | [diff] [blame] | 612 | static struct gbproxy_tlli_info *gbprox_get_detached_tlli_info( |
| 613 | struct gbproxy_peer *peer, |
| 614 | struct gbproxy_tlli_info *tlli_info, |
| 615 | uint32_t tlli) |
| 616 | { |
| 617 | struct gbproxy_patch_state *state = &peer->patch_state; |
| 618 | |
| 619 | if (!tlli_info) { |
| 620 | tlli_info = talloc_zero(peer, struct gbproxy_tlli_info); |
| 621 | tlli_info->tlli = tlli; |
| 622 | } else { |
| 623 | llist_del(&tlli_info->list); |
| 624 | OSMO_ASSERT(state->enabled_tllis_count > 0); |
| 625 | state->enabled_tllis_count -= 1; |
Jacob Erlbeck | 985b46e | 2014-08-07 17:23:00 +0200 | [diff] [blame] | 626 | |
| 627 | peer->ctrg->ctr[GBPROX_PEER_CTR_TLLI_CACHE_SIZE].current = |
| 628 | state->enabled_tllis_count; |
Jacob Erlbeck | 6d9118f | 2014-07-03 15:52:49 +0200 | [diff] [blame] | 629 | } |
| 630 | |
| 631 | return tlli_info; |
| 632 | } |
| 633 | |
| 634 | static void gbprox_update_tlli_info(struct gbproxy_tlli_info *tlli_info, |
| 635 | const uint8_t *imsi, size_t imsi_len) |
| 636 | { |
Jacob Erlbeck | 9ac42ba | 2014-08-06 18:55:15 +0200 | [diff] [blame] | 637 | if (!is_mi_imsi(imsi, imsi_len)) |
| 638 | return; |
| 639 | |
Jacob Erlbeck | 6d9118f | 2014-07-03 15:52:49 +0200 | [diff] [blame] | 640 | tlli_info->mi_data_len = imsi_len; |
| 641 | tlli_info->mi_data = |
| 642 | talloc_realloc_size(tlli_info, tlli_info->mi_data, imsi_len); |
| 643 | OSMO_ASSERT(tlli_info->mi_data != NULL); |
| 644 | memcpy(tlli_info->mi_data, imsi, imsi_len); |
| 645 | } |
| 646 | |
Jacob Erlbeck | 9ac42ba | 2014-08-06 18:55:15 +0200 | [diff] [blame] | 647 | void gbprox_reassign_tlli(struct gbproxy_tlli_info *tlli_info, |
| 648 | struct gbproxy_peer *peer, uint32_t new_tlli) |
| 649 | { |
| 650 | if (new_tlli == tlli_info->tlli) |
| 651 | return; |
| 652 | |
| 653 | LOGP(DGPRS, LOGL_INFO, |
| 654 | "The TLLI has been reassigned from %08x to %08x\n", |
| 655 | tlli_info->tlli, new_tlli); |
| 656 | |
| 657 | /* TODO: Save old TLLI */ |
| 658 | tlli_info->tlli = new_tlli; |
| 659 | } |
| 660 | |
Jacob Erlbeck | ccc5970 | 2014-08-07 20:18:47 +0200 | [diff] [blame^] | 661 | void gbprox_touch_tlli(struct gbproxy_peer *peer, |
| 662 | struct gbproxy_tlli_info *tlli_info, time_t now) |
| 663 | { |
| 664 | gbprox_get_detached_tlli_info(peer, tlli_info, tlli_info->tlli); |
| 665 | gbprox_attach_tlli_info(peer, now, tlli_info); |
| 666 | } |
| 667 | |
| 668 | struct gbproxy_tlli_info *gbprox_register_tlli( |
| 669 | struct gbproxy_peer *peer, uint32_t tlli, |
| 670 | const uint8_t *imsi, size_t imsi_len, time_t now) |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 671 | { |
Holger Hans Peter Freyther | d64bf22 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 672 | struct gbproxy_tlli_info *tlli_info; |
Jacob Erlbeck | 9ac42ba | 2014-08-06 18:55:15 +0200 | [diff] [blame] | 673 | int enable_patching = -1; |
Jacob Erlbeck | 6d9118f | 2014-07-03 15:52:49 +0200 | [diff] [blame] | 674 | int tlli_already_known; |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 675 | |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 676 | /* Check, whether the IMSI matches */ |
Jacob Erlbeck | 9ac42ba | 2014-08-06 18:55:15 +0200 | [diff] [blame] | 677 | if (is_mi_imsi(imsi, imsi_len)) { |
| 678 | enable_patching = gbprox_check_imsi(peer, imsi, imsi_len); |
| 679 | if (enable_patching < 0) |
Jacob Erlbeck | ccc5970 | 2014-08-07 20:18:47 +0200 | [diff] [blame^] | 680 | return NULL; |
Jacob Erlbeck | 9ac42ba | 2014-08-06 18:55:15 +0200 | [diff] [blame] | 681 | } |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 682 | |
Jacob Erlbeck | 6d9118f | 2014-07-03 15:52:49 +0200 | [diff] [blame] | 683 | tlli_info = gbprox_find_tlli(peer, tlli); |
| 684 | |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 685 | if (!tlli_info) { |
| 686 | tlli_info = gbprox_find_tlli_by_mi(peer, imsi, imsi_len); |
| 687 | |
| 688 | if (tlli_info) { |
| 689 | /* TLLI has changed somehow, adjust it */ |
| 690 | LOGP(DGPRS, LOGL_INFO, |
| 691 | "The TLLI has changed from %08x to %08x\n", |
| 692 | tlli_info->tlli, tlli); |
| 693 | tlli_info->tlli = tlli; |
| 694 | } |
| 695 | } |
| 696 | |
Jacob Erlbeck | 6d9118f | 2014-07-03 15:52:49 +0200 | [diff] [blame] | 697 | tlli_already_known = tlli_info != NULL; |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 698 | |
Jacob Erlbeck | 6d9118f | 2014-07-03 15:52:49 +0200 | [diff] [blame] | 699 | tlli_info = gbprox_get_detached_tlli_info(peer, tlli_info, tlli); |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 700 | OSMO_ASSERT(tlli_info != NULL); |
| 701 | |
Jacob Erlbeck | 9ac42ba | 2014-08-06 18:55:15 +0200 | [diff] [blame] | 702 | if (!tlli_already_known) |
| 703 | LOGP(DGPRS, LOGL_INFO, "Adding TLLI %08x to list\n", tlli); |
Jacob Erlbeck | 6d9118f | 2014-07-03 15:52:49 +0200 | [diff] [blame] | 704 | |
Jacob Erlbeck | 9ac42ba | 2014-08-06 18:55:15 +0200 | [diff] [blame] | 705 | gbprox_attach_tlli_info(peer, now, tlli_info); |
| 706 | gbprox_update_tlli_info(tlli_info, imsi, imsi_len); |
Jacob Erlbeck | ccc5970 | 2014-08-07 20:18:47 +0200 | [diff] [blame^] | 707 | |
Jacob Erlbeck | 9ac42ba | 2014-08-06 18:55:15 +0200 | [diff] [blame] | 708 | if (enable_patching >= 0) |
| 709 | tlli_info->enable_patching = enable_patching; |
Jacob Erlbeck | ccc5970 | 2014-08-07 20:18:47 +0200 | [diff] [blame^] | 710 | |
| 711 | return tlli_info; |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 712 | } |
| 713 | |
Holger Hans Peter Freyther | d64bf22 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 714 | static void gbprox_unregister_tlli(struct gbproxy_peer *peer, uint32_t tlli) |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 715 | { |
Holger Hans Peter Freyther | d64bf22 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 716 | struct gbproxy_tlli_info *tlli_info; |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 717 | |
| 718 | tlli_info = gbprox_find_tlli(peer, tlli); |
| 719 | if (tlli_info) { |
| 720 | LOGP(DGPRS, LOGL_INFO, |
| 721 | "Removing TLLI %08x from list\n", |
| 722 | tlli); |
Holger Hans Peter Freyther | c120d11 | 2014-08-04 12:18:07 +0200 | [diff] [blame] | 723 | gbprox_delete_tlli(peer, tlli_info); |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 724 | } |
| 725 | } |
| 726 | |
Holger Hans Peter Freyther | d64bf22 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 727 | static int gbprox_check_tlli(struct gbproxy_peer *peer, uint32_t tlli) |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 728 | { |
Jacob Erlbeck | 9ac42ba | 2014-08-06 18:55:15 +0200 | [diff] [blame] | 729 | struct gbproxy_tlli_info *tlli_info; |
| 730 | |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 731 | LOGP(DGPRS, LOGL_INFO, "Checking TLLI %08x, class: %d\n", |
| 732 | tlli, gprs_tlli_type(tlli)); |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 733 | |
Jacob Erlbeck | 9ac42ba | 2014-08-06 18:55:15 +0200 | [diff] [blame] | 734 | if (!peer->cfg->check_imsi) |
| 735 | return 1; |
| 736 | |
| 737 | tlli_info = gbprox_find_tlli(peer, tlli); |
| 738 | |
| 739 | return tlli_info != NULL && tlli_info->enable_patching; |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 740 | } |
| 741 | |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 742 | /* check whether patching is enabled at this level */ |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 743 | static int patching_is_enabled(struct gbproxy_peer *peer, |
| 744 | enum gbproxy_patch_mode need_at_least) |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 745 | { |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 746 | enum gbproxy_patch_mode patch_mode = peer->cfg->patch_mode; |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 747 | if (patch_mode == GBPROX_PATCH_DEFAULT) |
| 748 | patch_mode = GBPROX_PATCH_LLC; |
| 749 | |
| 750 | return need_at_least <= patch_mode; |
| 751 | } |
| 752 | |
| 753 | /* check whether patching is enabled at this level */ |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 754 | static int patching_is_required(struct gbproxy_peer *peer, |
| 755 | enum gbproxy_patch_mode need_at_least) |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 756 | { |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 757 | return need_at_least <= peer->cfg->patch_mode; |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 758 | } |
| 759 | |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 760 | /* patch RA identifier in place, update peer accordingly */ |
Holger Hans Peter Freyther | d64bf22 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 761 | static void gbprox_patch_raid(uint8_t *raid_enc, struct gbproxy_peer *peer, |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 762 | int to_bss, const char *log_text) |
| 763 | { |
Holger Hans Peter Freyther | d64bf22 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 764 | struct gbproxy_patch_state *state = &peer->patch_state; |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 765 | const int old_local_mcc = state->local_mcc; |
| 766 | const int old_local_mnc = state->local_mnc; |
| 767 | int old_mcc; |
| 768 | int old_mnc; |
| 769 | struct gprs_ra_id raid; |
| 770 | |
| 771 | gsm48_parse_ra(&raid, raid_enc); |
| 772 | |
| 773 | old_mcc = raid.mcc; |
| 774 | old_mnc = raid.mnc; |
| 775 | |
| 776 | if (!to_bss) { |
| 777 | /* BSS -> SGSN */ |
| 778 | /* save BSS side MCC/MNC */ |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 779 | if (!peer->cfg->core_mcc || raid.mcc == peer->cfg->core_mcc) { |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 780 | state->local_mcc = 0; |
| 781 | } else { |
| 782 | state->local_mcc = raid.mcc; |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 783 | raid.mcc = peer->cfg->core_mcc; |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 784 | } |
| 785 | |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 786 | if (!peer->cfg->core_mnc || raid.mnc == peer->cfg->core_mnc) { |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 787 | state->local_mnc = 0; |
| 788 | } else { |
| 789 | state->local_mnc = raid.mnc; |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 790 | raid.mnc = peer->cfg->core_mnc; |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 791 | } |
| 792 | } else { |
| 793 | /* SGSN -> BSS */ |
| 794 | if (state->local_mcc) |
| 795 | raid.mcc = state->local_mcc; |
| 796 | |
| 797 | if (state->local_mnc) |
| 798 | raid.mnc = state->local_mnc; |
| 799 | } |
| 800 | |
| 801 | if (old_local_mcc != state->local_mcc || |
| 802 | old_local_mnc != state->local_mnc) |
| 803 | LOGP(DGPRS, LOGL_NOTICE, |
| 804 | "Patching RAID %sactivated, msg: %s, " |
| 805 | "local: %d-%d, core: %d-%d, to %s\n", |
| 806 | state->local_mcc || state->local_mnc ? |
| 807 | "" : "de", |
| 808 | log_text, |
| 809 | state->local_mcc, state->local_mnc, |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 810 | peer->cfg->core_mcc, peer->cfg->core_mnc, |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 811 | to_bss ? "BSS" : "SGSN"); |
| 812 | |
| 813 | if (state->local_mcc || state->local_mnc) { |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 814 | enum gbprox_peer_ctr counter = |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 815 | to_bss ? |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 816 | GBPROX_PEER_CTR_RAID_PATCHED_SGSN : |
| 817 | GBPROX_PEER_CTR_RAID_PATCHED_BSS; |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 818 | |
| 819 | LOGP(DGPRS, LOGL_DEBUG, |
| 820 | "Patching %s to %s: " |
| 821 | "%d-%d-%d-%d -> %d-%d-%d-%d\n", |
| 822 | log_text, |
| 823 | to_bss ? "BSS" : "SGSN", |
| 824 | old_mcc, old_mnc, raid.lac, raid.rac, |
| 825 | raid.mcc, raid.mnc, raid.lac, raid.rac); |
| 826 | |
| 827 | gsm48_construct_ra(raid_enc, &raid); |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 828 | rate_ctr_inc(&peer->ctrg->ctr[counter]); |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 829 | } |
| 830 | } |
| 831 | |
Jacob Erlbeck | 5620c6d | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 832 | static void gbprox_patch_apn_ie(struct msgb *msg, |
| 833 | uint8_t *apn_ie, size_t apn_ie_len, |
Holger Hans Peter Freyther | d64bf22 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 834 | struct gbproxy_peer *peer, |
Jacob Erlbeck | 5620c6d | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 835 | size_t *new_apn_ie_len, const char *log_text) |
| 836 | { |
| 837 | struct apn_ie_hdr { |
| 838 | uint8_t iei; |
| 839 | uint8_t apn_len; |
| 840 | uint8_t apn[0]; |
| 841 | } *hdr = (void *)apn_ie; |
| 842 | |
| 843 | size_t apn_len = hdr->apn_len; |
| 844 | uint8_t *apn = hdr->apn; |
| 845 | |
| 846 | OSMO_ASSERT(apn_ie_len == apn_len + sizeof(struct apn_ie_hdr)); |
| 847 | OSMO_ASSERT(apn_ie_len > 2 && apn_ie_len <= 102); |
| 848 | |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 849 | if (peer->cfg->core_apn_size == 0) { |
Jacob Erlbeck | 5620c6d | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 850 | char str1[110]; |
| 851 | /* Remove the IE */ |
| 852 | LOGP(DGPRS, LOGL_DEBUG, |
| 853 | "Patching %s to SGSN: Removing APN '%s'\n", |
| 854 | log_text, |
Holger Hans Peter Freyther | 8ac3a72 | 2014-08-04 11:52:52 +0200 | [diff] [blame] | 855 | gprs_apn_to_str(str1, apn, apn_len)); |
Jacob Erlbeck | 5620c6d | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 856 | |
| 857 | *new_apn_ie_len = 0; |
Holger Hans Peter Freyther | 8ac3a72 | 2014-08-04 11:52:52 +0200 | [diff] [blame] | 858 | gprs_msgb_resize_area(msg, apn_ie, apn_ie_len, 0); |
Jacob Erlbeck | 5620c6d | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 859 | } else { |
| 860 | /* Resize the IE */ |
| 861 | char str1[110]; |
| 862 | char str2[110]; |
| 863 | |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 864 | OSMO_ASSERT(peer->cfg->core_apn_size <= 100); |
Jacob Erlbeck | 5620c6d | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 865 | |
| 866 | LOGP(DGPRS, LOGL_DEBUG, |
| 867 | "Patching %s to SGSN: " |
| 868 | "Replacing APN '%s' -> '%s'\n", |
| 869 | log_text, |
Holger Hans Peter Freyther | 8ac3a72 | 2014-08-04 11:52:52 +0200 | [diff] [blame] | 870 | gprs_apn_to_str(str1, apn, apn_len), |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 871 | gprs_apn_to_str(str2, peer->cfg->core_apn, |
| 872 | peer->cfg->core_apn_size)); |
Jacob Erlbeck | 5620c6d | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 873 | |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 874 | *new_apn_ie_len = peer->cfg->core_apn_size + 2; |
| 875 | gprs_msgb_resize_area(msg, apn, apn_len, peer->cfg->core_apn_size); |
| 876 | memcpy(apn, peer->cfg->core_apn, peer->cfg->core_apn_size); |
| 877 | hdr->apn_len = peer->cfg->core_apn_size; |
Jacob Erlbeck | 5620c6d | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 878 | } |
| 879 | |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 880 | rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_APN_PATCHED]); |
Jacob Erlbeck | 5620c6d | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 881 | } |
| 882 | |
Jacob Erlbeck | 3b66d85 | 2014-08-05 15:53:43 +0200 | [diff] [blame] | 883 | static int gbprox_parse_gmm_attach_req(uint8_t *data, size_t data_len, |
Holger Hans Peter Freyther | d64bf22 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 884 | struct gbproxy_parse_context *parse_ctx) |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 885 | { |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 886 | uint8_t *value; |
| 887 | size_t value_len; |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 888 | |
Jacob Erlbeck | 3b66d85 | 2014-08-05 15:53:43 +0200 | [diff] [blame] | 889 | parse_ctx->llc_msg_name = "ATTACH_REQ"; |
| 890 | |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 891 | /* Skip MS network capability */ |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 892 | if (lv_shift(&data, &data_len, NULL, &value_len) <= 0 || |
| 893 | value_len < 1 || value_len > 2) |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 894 | /* invalid */ |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 895 | return 0;; |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 896 | |
| 897 | /* Skip Attach type */ |
| 898 | /* Skip Ciphering key sequence number */ |
| 899 | /* Skip DRX parameter */ |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 900 | v_fixed_shift(&data, &data_len, 3, NULL); |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 901 | |
Jacob Erlbeck | dc6dcdf | 2014-08-06 15:16:45 +0200 | [diff] [blame] | 902 | /* Get Mobile identity */ |
| 903 | if (lv_shift(&data, &data_len, &value, &value_len) <= 0 || |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 904 | value_len < 5 || value_len > 8) |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 905 | /* invalid */ |
Jacob Erlbeck | dc6dcdf | 2014-08-06 15:16:45 +0200 | [diff] [blame] | 906 | return 0; |
| 907 | |
| 908 | if (is_mi_tmsi(value, value_len)) { |
| 909 | parse_ctx->ptmsi_enc = value; |
| 910 | } else if (is_mi_imsi(value, value_len)) { |
| 911 | parse_ctx->imsi = value; |
| 912 | parse_ctx->imsi_len = value_len; |
| 913 | } |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 914 | |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 915 | if (v_fixed_shift(&data, &data_len, 6, &value) <= 0) |
| 916 | return 0; |
| 917 | |
Jacob Erlbeck | 3b66d85 | 2014-08-05 15:53:43 +0200 | [diff] [blame] | 918 | parse_ctx->raid_enc = value; |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 919 | |
| 920 | return 1; |
| 921 | } |
| 922 | |
Jacob Erlbeck | 3b66d85 | 2014-08-05 15:53:43 +0200 | [diff] [blame] | 923 | static int gbprox_parse_gmm_attach_ack(uint8_t *data, size_t data_len, |
Holger Hans Peter Freyther | d64bf22 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 924 | struct gbproxy_parse_context *parse_ctx) |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 925 | { |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 926 | uint8_t *value; |
Jacob Erlbeck | f5b2085 | 2014-06-27 18:10:53 +0200 | [diff] [blame] | 927 | size_t value_len; |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 928 | |
Jacob Erlbeck | 3b66d85 | 2014-08-05 15:53:43 +0200 | [diff] [blame] | 929 | parse_ctx->llc_msg_name = "ATTACH_ACK"; |
| 930 | |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 931 | /* Skip Attach result */ |
| 932 | /* Skip Force to standby */ |
| 933 | /* Skip Periodic RA update timer */ |
| 934 | /* Skip Radio priority for SMS */ |
| 935 | /* Skip Spare half octet */ |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 936 | v_fixed_shift(&data, &data_len, 3, NULL); |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 937 | |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 938 | if (v_fixed_shift(&data, &data_len, 6, &value) <= 0) |
| 939 | return 0; |
| 940 | |
Jacob Erlbeck | 3b66d85 | 2014-08-05 15:53:43 +0200 | [diff] [blame] | 941 | parse_ctx->raid_enc = value; |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 942 | |
Jacob Erlbeck | f5b2085 | 2014-06-27 18:10:53 +0200 | [diff] [blame] | 943 | /* Skip P-TMSI signature (P-TMSI signature, opt, TV, length 4) */ |
| 944 | tv_fixed_match(&data, &data_len, GSM48_IE_GMM_PTMSI_SIG, 3, NULL); |
| 945 | |
| 946 | /* Skip Negotiated READY timer value (GPRS timer, opt, TV, length 2) */ |
| 947 | tv_fixed_match(&data, &data_len, GSM48_IE_GMM_TIMER_READY, 1, NULL); |
| 948 | |
| 949 | /* Allocated P-TMSI (Mobile identity, opt, TLV, length 7) */ |
| 950 | if (tlv_match(&data, &data_len, GSM48_IE_GMM_ALLOC_PTMSI, |
Jacob Erlbeck | 3b66d85 | 2014-08-05 15:53:43 +0200 | [diff] [blame] | 951 | &value, &value_len) > 0 && |
| 952 | is_mi_tmsi(value, value_len)) |
Jacob Erlbeck | dc6dcdf | 2014-08-06 15:16:45 +0200 | [diff] [blame] | 953 | parse_ctx->new_ptmsi_enc = value; |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 954 | return 1; |
| 955 | } |
| 956 | |
Jacob Erlbeck | 3b66d85 | 2014-08-05 15:53:43 +0200 | [diff] [blame] | 957 | static int gbprox_parse_gmm_ra_upd_req(uint8_t *data, size_t data_len, |
Holger Hans Peter Freyther | d64bf22 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 958 | struct gbproxy_parse_context *parse_ctx) |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 959 | { |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 960 | uint8_t *value; |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 961 | |
Jacob Erlbeck | 3b66d85 | 2014-08-05 15:53:43 +0200 | [diff] [blame] | 962 | parse_ctx->llc_msg_name = "RA_UPD_REQ"; |
| 963 | |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 964 | /* Skip Update type */ |
| 965 | /* Skip GPRS ciphering key sequence number */ |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 966 | v_fixed_shift(&data, &data_len, 1, NULL); |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 967 | |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 968 | if (v_fixed_shift(&data, &data_len, 6, &value) <= 0) |
| 969 | return 0; |
| 970 | |
Jacob Erlbeck | 3b66d85 | 2014-08-05 15:53:43 +0200 | [diff] [blame] | 971 | parse_ctx->raid_enc = value; |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 972 | |
| 973 | return 1; |
| 974 | } |
| 975 | |
Jacob Erlbeck | 3b66d85 | 2014-08-05 15:53:43 +0200 | [diff] [blame] | 976 | static int gbprox_parse_gmm_ra_upd_ack(uint8_t *data, size_t data_len, |
Holger Hans Peter Freyther | d64bf22 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 977 | struct gbproxy_parse_context *parse_ctx) |
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 | uint8_t *value; |
Jacob Erlbeck | f5b2085 | 2014-06-27 18:10:53 +0200 | [diff] [blame] | 980 | size_t value_len; |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 981 | |
Jacob Erlbeck | 3b66d85 | 2014-08-05 15:53:43 +0200 | [diff] [blame] | 982 | parse_ctx->llc_msg_name = "RA_UPD_ACK"; |
| 983 | |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 984 | /* Skip Force to standby */ |
| 985 | /* Skip Update result */ |
| 986 | /* Skip Periodic RA update timer */ |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 987 | v_fixed_shift(&data, &data_len, 2, NULL); |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 988 | |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 989 | if (v_fixed_shift(&data, &data_len, 6, &value) <= 0) |
| 990 | return 0; |
| 991 | |
Jacob Erlbeck | 3b66d85 | 2014-08-05 15:53:43 +0200 | [diff] [blame] | 992 | parse_ctx->raid_enc = value; |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 993 | |
Jacob Erlbeck | f5b2085 | 2014-06-27 18:10:53 +0200 | [diff] [blame] | 994 | /* Skip P-TMSI signature (P-TMSI signature, opt, TV, length 4) */ |
| 995 | tv_fixed_match(&data, &data_len, GSM48_IE_GMM_PTMSI_SIG, 3, NULL); |
| 996 | |
| 997 | /* Allocated P-TMSI (Mobile identity, opt, TLV, length 7) */ |
| 998 | if (tlv_match(&data, &data_len, GSM48_IE_GMM_ALLOC_PTMSI, |
Jacob Erlbeck | 3b66d85 | 2014-08-05 15:53:43 +0200 | [diff] [blame] | 999 | &value, &value_len) > 0 && |
| 1000 | is_mi_tmsi(value, value_len)) |
Jacob Erlbeck | dc6dcdf | 2014-08-06 15:16:45 +0200 | [diff] [blame] | 1001 | parse_ctx->new_ptmsi_enc = value; |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1002 | |
| 1003 | return 1; |
| 1004 | } |
| 1005 | |
Jacob Erlbeck | 3b66d85 | 2014-08-05 15:53:43 +0200 | [diff] [blame] | 1006 | static int gbprox_parse_gmm_ptmsi_reall_cmd(uint8_t *data, size_t data_len, |
Holger Hans Peter Freyther | d64bf22 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 1007 | struct gbproxy_parse_context *parse_ctx) |
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 | uint8_t *value; |
| 1010 | size_t value_len; |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1011 | |
Jacob Erlbeck | 3b66d85 | 2014-08-05 15:53:43 +0200 | [diff] [blame] | 1012 | parse_ctx->llc_msg_name = "PTMSI_REALL_CMD"; |
| 1013 | |
Jacob Erlbeck | f5b2085 | 2014-06-27 18:10:53 +0200 | [diff] [blame] | 1014 | LOGP(DLLC, LOGL_NOTICE, |
| 1015 | "Got P-TMSI Reallocation Command which is not covered by unit tests yet.\n"); |
| 1016 | |
| 1017 | /* Allocated P-TMSI */ |
| 1018 | if (lv_shift(&data, &data_len, &value, &value_len) > 0 && |
Jacob Erlbeck | 3b66d85 | 2014-08-05 15:53:43 +0200 | [diff] [blame] | 1019 | is_mi_tmsi(value, value_len)) |
Jacob Erlbeck | dc6dcdf | 2014-08-06 15:16:45 +0200 | [diff] [blame] | 1020 | parse_ctx->new_ptmsi_enc = value; |
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 | if (v_fixed_shift(&data, &data_len, 6, &value) <= 0) |
| 1023 | return 0; |
| 1024 | |
Jacob Erlbeck | 3b66d85 | 2014-08-05 15:53:43 +0200 | [diff] [blame] | 1025 | parse_ctx->raid_enc = value; |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1026 | |
| 1027 | return 1; |
| 1028 | } |
| 1029 | |
Jacob Erlbeck | dc6dcdf | 2014-08-06 15:16:45 +0200 | [diff] [blame] | 1030 | static int gbprox_parse_gmm_id_resp(uint8_t *data, size_t data_len, |
| 1031 | struct gbproxy_parse_context *parse_ctx) |
| 1032 | { |
| 1033 | uint8_t *value; |
| 1034 | size_t value_len; |
| 1035 | |
| 1036 | parse_ctx->llc_msg_name = "ID_RESP"; |
| 1037 | |
| 1038 | /* Mobile identity, Mobile identity 10.5.1.4, M LV 2-10 */ |
| 1039 | if (lv_shift(&data, &data_len, &value, &value_len) <= 0 || |
| 1040 | value_len < 1 || value_len > 9) |
| 1041 | /* invalid */ |
| 1042 | return 0; |
| 1043 | |
| 1044 | if (is_mi_tmsi(value, value_len)) { |
| 1045 | parse_ctx->ptmsi_enc = value; |
| 1046 | } else if (is_mi_imsi(value, value_len)) { |
| 1047 | parse_ctx->imsi = value; |
| 1048 | parse_ctx->imsi_len = value_len; |
| 1049 | } |
| 1050 | |
| 1051 | return 1; |
| 1052 | } |
| 1053 | |
Jacob Erlbeck | 3b66d85 | 2014-08-05 15:53:43 +0200 | [diff] [blame] | 1054 | static int gbprox_parse_gsm_act_pdp_req(uint8_t *data, size_t data_len, |
Holger Hans Peter Freyther | d64bf22 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 1055 | struct gbproxy_parse_context *parse_ctx) |
Jacob Erlbeck | 5620c6d | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 1056 | { |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 1057 | ssize_t old_len; |
| 1058 | uint8_t *value; |
| 1059 | size_t value_len; |
Jacob Erlbeck | 3b66d85 | 2014-08-05 15:53:43 +0200 | [diff] [blame] | 1060 | |
| 1061 | parse_ctx->llc_msg_name = "ACT_PDP_REQ"; |
Jacob Erlbeck | 5620c6d | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 1062 | |
| 1063 | /* Skip Requested NSAPI */ |
| 1064 | /* Skip Requested LLC SAPI */ |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 1065 | v_fixed_shift(&data, &data_len, 2, NULL); |
Jacob Erlbeck | 5620c6d | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 1066 | |
| 1067 | /* Skip Requested QoS (support 04.08 and 24.008) */ |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 1068 | if (lv_shift(&data, &data_len, NULL, &value_len) <= 0 || |
| 1069 | value_len < 4 || value_len > 14) |
Jacob Erlbeck | 5620c6d | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 1070 | /* invalid */ |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 1071 | return 0;; |
Jacob Erlbeck | 5620c6d | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 1072 | |
| 1073 | /* Skip Requested PDP address */ |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 1074 | if (lv_shift(&data, &data_len, NULL, &value_len) <= 0 || |
| 1075 | value_len < 2 || value_len > 18) |
Jacob Erlbeck | 5620c6d | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 1076 | /* invalid */ |
| 1077 | return 0; |
Jacob Erlbeck | 5620c6d | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 1078 | |
| 1079 | /* Access point name */ |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 1080 | old_len = tlv_match(&data, &data_len, |
| 1081 | GSM48_IE_GSM_APN, &value, &value_len); |
Jacob Erlbeck | 5620c6d | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 1082 | |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 1083 | if (old_len > 0 && value_len >=1 && value_len <= 100) { |
Jacob Erlbeck | 3b66d85 | 2014-08-05 15:53:43 +0200 | [diff] [blame] | 1084 | parse_ctx->apn_ie = data - old_len; |
| 1085 | parse_ctx->apn_ie_len = old_len; |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 1086 | } |
Jacob Erlbeck | 5620c6d | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 1087 | |
Jacob Erlbeck | 3b66d85 | 2014-08-05 15:53:43 +0200 | [diff] [blame] | 1088 | return 1; |
Jacob Erlbeck | 5620c6d | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 1089 | } |
| 1090 | |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1091 | struct gbproxy_peer *peer_by_bssgp_tlv(struct gbproxy_config *cfg, struct tlv_parsed *tp) |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 1092 | { |
| 1093 | if (TLVP_PRESENT(tp, BSSGP_IE_BVCI)) { |
| 1094 | uint16_t bvci; |
| 1095 | |
| 1096 | bvci = ntohs(tlvp_val16_unal(tp, BSSGP_IE_BVCI)); |
| 1097 | if (bvci >= 2) |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1098 | return peer_by_bvci(cfg, bvci); |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 1099 | } |
| 1100 | |
| 1101 | if (TLVP_PRESENT(tp, BSSGP_IE_ROUTEING_AREA)) { |
| 1102 | uint8_t *rai = (uint8_t *)TLVP_VAL(tp, BSSGP_IE_ROUTEING_AREA); |
| 1103 | /* Only compare LAC part, since MCC/MNC are possibly patched. |
| 1104 | * Since the LAC of different BSS must be different when |
| 1105 | * MCC/MNC are patched, collisions shouldn't happen. */ |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1106 | return peer_by_lac(cfg, rai); |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 1107 | } |
| 1108 | |
| 1109 | if (TLVP_PRESENT(tp, BSSGP_IE_LOCATION_AREA)) { |
| 1110 | uint8_t *lai = (uint8_t *)TLVP_VAL(tp, BSSGP_IE_LOCATION_AREA); |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1111 | return peer_by_lac(cfg, lai); |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 1112 | } |
| 1113 | |
| 1114 | return NULL; |
| 1115 | } |
| 1116 | |
Jacob Erlbeck | 3b66d85 | 2014-08-05 15:53:43 +0200 | [diff] [blame] | 1117 | static int gbprox_parse_dtap(uint8_t *data, size_t data_len, |
Holger Hans Peter Freyther | 9f9bd13 | 2014-08-04 16:06:20 +0200 | [diff] [blame] | 1118 | struct gbproxy_parse_context *parse_ctx) __attribute__((nonnull)); |
| 1119 | |
Jacob Erlbeck | 3b66d85 | 2014-08-05 15:53:43 +0200 | [diff] [blame] | 1120 | static int gbprox_parse_dtap(uint8_t *data, size_t data_len, |
Holger Hans Peter Freyther | d64bf22 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 1121 | struct gbproxy_parse_context *parse_ctx) |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1122 | { |
| 1123 | struct gsm48_hdr *g48h; |
| 1124 | |
Jacob Erlbeck | 4b3d038 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 1125 | 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] | 1126 | return 0; |
| 1127 | |
Jacob Erlbeck | 3b66d85 | 2014-08-05 15:53:43 +0200 | [diff] [blame] | 1128 | parse_ctx->g48_hdr = g48h; |
| 1129 | |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1130 | if ((g48h->proto_discr & 0x0f) != GSM48_PDISC_MM_GPRS && |
| 1131 | (g48h->proto_discr & 0x0f) != GSM48_PDISC_SM_GPRS) |
Jacob Erlbeck | 3b66d85 | 2014-08-05 15:53:43 +0200 | [diff] [blame] | 1132 | return 1; |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1133 | |
| 1134 | switch (g48h->msg_type) { |
| 1135 | case GSM48_MT_GMM_ATTACH_REQ: |
Jacob Erlbeck | 3b66d85 | 2014-08-05 15:53:43 +0200 | [diff] [blame] | 1136 | return gbprox_parse_gmm_attach_req(data, data_len, parse_ctx); |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1137 | |
| 1138 | case GSM48_MT_GMM_ATTACH_ACK: |
Jacob Erlbeck | 3b66d85 | 2014-08-05 15:53:43 +0200 | [diff] [blame] | 1139 | return gbprox_parse_gmm_attach_ack(data, data_len, parse_ctx); |
Jacob Erlbeck | 481da7c | 2014-06-27 10:44:46 +0200 | [diff] [blame] | 1140 | |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1141 | case GSM48_MT_GMM_RA_UPD_REQ: |
Jacob Erlbeck | 3b66d85 | 2014-08-05 15:53:43 +0200 | [diff] [blame] | 1142 | return gbprox_parse_gmm_ra_upd_req(data, data_len, parse_ctx); |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1143 | |
| 1144 | case GSM48_MT_GMM_RA_UPD_ACK: |
Jacob Erlbeck | 3b66d85 | 2014-08-05 15:53:43 +0200 | [diff] [blame] | 1145 | return gbprox_parse_gmm_ra_upd_ack(data, data_len, parse_ctx); |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1146 | |
| 1147 | case GSM48_MT_GMM_PTMSI_REALL_CMD: |
Jacob Erlbeck | 3b66d85 | 2014-08-05 15:53:43 +0200 | [diff] [blame] | 1148 | return gbprox_parse_gmm_ptmsi_reall_cmd(data, data_len, parse_ctx); |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1149 | |
Jacob Erlbeck | 5620c6d | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 1150 | case GSM48_MT_GSM_ACT_PDP_REQ: |
Jacob Erlbeck | 3b66d85 | 2014-08-05 15:53:43 +0200 | [diff] [blame] | 1151 | return gbprox_parse_gsm_act_pdp_req(data, data_len, parse_ctx); |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 1152 | |
Jacob Erlbeck | dc6dcdf | 2014-08-06 15:16:45 +0200 | [diff] [blame] | 1153 | case GSM48_MT_GMM_ID_RESP: |
| 1154 | return gbprox_parse_gmm_id_resp(data, data_len, parse_ctx); |
| 1155 | break; |
| 1156 | |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 1157 | case GSM48_MT_GMM_DETACH_REQ: |
Jacob Erlbeck | 2f2aa2e | 2014-08-05 18:28:51 +0200 | [diff] [blame] | 1158 | /* TODO: Check power off if !to_bss, if yes invalidate */ |
| 1159 | parse_ctx->llc_msg_name = "DETACH_REQ"; |
| 1160 | break; |
| 1161 | |
| 1162 | case GSM48_MT_GMM_DETACH_ACK: |
| 1163 | parse_ctx->llc_msg_name = "DETACH_ACK"; |
Jacob Erlbeck | 3b66d85 | 2014-08-05 15:53:43 +0200 | [diff] [blame] | 1164 | parse_ctx->invalidate_tlli = 1; |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 1165 | break; |
| 1166 | |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1167 | default: |
| 1168 | break; |
| 1169 | }; |
| 1170 | |
Jacob Erlbeck | 3b66d85 | 2014-08-05 15:53:43 +0200 | [diff] [blame] | 1171 | return 1; |
| 1172 | } |
| 1173 | |
| 1174 | static int allow_message_patching(struct gbproxy_peer *peer, int msg_type) |
| 1175 | { |
| 1176 | if (msg_type >= GSM48_MT_GSM_ACT_PDP_REQ) { |
| 1177 | return patching_is_enabled(peer, GBPROX_PATCH_LLC_GSM); |
| 1178 | } else if (msg_type > GSM48_MT_GMM_ATTACH_REJ) { |
| 1179 | return patching_is_enabled(peer, GBPROX_PATCH_LLC); |
| 1180 | } else if (msg_type > GSM48_MT_GMM_ATTACH_REQ) { |
| 1181 | return patching_is_enabled(peer, GBPROX_PATCH_LLC_ATTACH); |
| 1182 | } else { |
| 1183 | return patching_is_enabled(peer, GBPROX_PATCH_LLC_ATTACH_REQ); |
| 1184 | } |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1185 | } |
| 1186 | |
Jacob Erlbeck | 4dc663f | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 1187 | static int gbprox_parse_llc(uint8_t *llc, size_t llc_len, |
| 1188 | struct gbproxy_parse_context *parse_ctx) __attribute__((nonnull)); |
Jacob Erlbeck | 2f2aa2e | 2014-08-05 18:28:51 +0200 | [diff] [blame] | 1189 | |
Jacob Erlbeck | 4dc663f | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 1190 | static int gbprox_parse_llc(uint8_t *llc, size_t llc_len, |
| 1191 | struct gbproxy_parse_context *parse_ctx) |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1192 | { |
Jacob Erlbeck | 4dc663f | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 1193 | struct gprs_llc_hdr_parsed *ghp = &parse_ctx->llc_hdr_parsed; |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1194 | int rc; |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1195 | int fcs; |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1196 | |
| 1197 | /* parse LLC */ |
Jacob Erlbeck | 4dc663f | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 1198 | rc = gprs_llc_hdr_parse(ghp, llc, llc_len); |
| 1199 | gprs_llc_hdr_dump(ghp); |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1200 | if (rc != 0) { |
| 1201 | LOGP(DLLC, LOGL_NOTICE, "Error during LLC header parsing\n"); |
Jacob Erlbeck | 4dc663f | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 1202 | return 0; |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1203 | } |
| 1204 | |
Jacob Erlbeck | 4dc663f | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 1205 | fcs = gprs_llc_fcs(llc, ghp->crc_length); |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1206 | LOGP(DLLC, LOGL_DEBUG, "Got LLC message, CRC: %06x (computed %06x)\n", |
Jacob Erlbeck | 4dc663f | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 1207 | ghp->fcs, fcs); |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1208 | |
Jacob Erlbeck | 4dc663f | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 1209 | if (!ghp->data) |
| 1210 | return 0; |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1211 | |
Jacob Erlbeck | 4dc663f | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 1212 | if (ghp->sapi != GPRS_SAPI_GMM) |
| 1213 | return 0; |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1214 | |
Jacob Erlbeck | 4dc663f | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 1215 | if (ghp->cmd != GPRS_LLC_UI) |
| 1216 | return 0; |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1217 | |
Jacob Erlbeck | 4dc663f | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 1218 | if (ghp->is_encrypted) { |
| 1219 | parse_ctx->need_decryption = 1; |
| 1220 | return 0; |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1221 | } |
| 1222 | |
Jacob Erlbeck | 4dc663f | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 1223 | return gbprox_parse_dtap(ghp->data, ghp->data_len, parse_ctx); |
| 1224 | } |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1225 | |
Jacob Erlbeck | 4dc663f | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 1226 | static int gbprox_patch_llc(struct msgb *msg, uint8_t *llc, size_t llc_len, |
Jacob Erlbeck | ccc5970 | 2014-08-07 20:18:47 +0200 | [diff] [blame^] | 1227 | struct gbproxy_peer *peer, |
| 1228 | struct gbproxy_tlli_info *tlli_info, int *len_change, |
Jacob Erlbeck | 4dc663f | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 1229 | struct gbproxy_parse_context *parse_ctx) __attribute__((nonnull)); |
Jacob Erlbeck | f40a6c9 | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 1230 | |
Jacob Erlbeck | 4dc663f | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 1231 | static int gbprox_patch_llc(struct msgb *msg, uint8_t *llc, size_t llc_len, |
Jacob Erlbeck | ccc5970 | 2014-08-07 20:18:47 +0200 | [diff] [blame^] | 1232 | struct gbproxy_peer *peer, |
| 1233 | struct gbproxy_tlli_info *tlli_info, int *len_change, |
Jacob Erlbeck | 4dc663f | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 1234 | struct gbproxy_parse_context *parse_ctx) |
| 1235 | { |
| 1236 | struct gprs_llc_hdr_parsed *ghp = &parse_ctx->llc_hdr_parsed; |
| 1237 | int have_patched = 0; |
| 1238 | int fcs; |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1239 | |
Jacob Erlbeck | 4dc663f | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 1240 | if (!allow_message_patching(peer, parse_ctx->g48_hdr->msg_type)) |
| 1241 | return have_patched; |
Jacob Erlbeck | 3b66d85 | 2014-08-05 15:53:43 +0200 | [diff] [blame] | 1242 | |
Jacob Erlbeck | 4dc663f | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 1243 | if (parse_ctx->raid_enc) { |
| 1244 | gbprox_patch_raid(parse_ctx->raid_enc, peer, parse_ctx->to_bss, |
| 1245 | parse_ctx->llc_msg_name); |
| 1246 | have_patched = 1; |
Jacob Erlbeck | f5b2085 | 2014-06-27 18:10:53 +0200 | [diff] [blame] | 1247 | } |
| 1248 | |
Jacob Erlbeck | 4dc663f | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 1249 | if (parse_ctx->apn_ie && |
| 1250 | peer->cfg->core_apn && |
| 1251 | !parse_ctx->to_bss && |
| 1252 | gbprox_check_tlli(peer, parse_ctx->tlli)) { |
| 1253 | size_t new_len; |
| 1254 | gbprox_patch_apn_ie(msg, |
| 1255 | parse_ctx->apn_ie, parse_ctx->apn_ie_len, |
| 1256 | peer, &new_len, parse_ctx->llc_msg_name); |
| 1257 | *len_change += (int)new_len - (int)parse_ctx->apn_ie_len; |
Jacob Erlbeck | 2f2aa2e | 2014-08-05 18:28:51 +0200 | [diff] [blame] | 1258 | |
Jacob Erlbeck | 4dc663f | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 1259 | have_patched = 1; |
| 1260 | } |
| 1261 | |
| 1262 | if (have_patched) { |
| 1263 | llc_len += *len_change; |
| 1264 | ghp->crc_length += *len_change; |
| 1265 | |
| 1266 | /* Fix FCS */ |
| 1267 | fcs = gprs_llc_fcs(llc, ghp->crc_length); |
| 1268 | LOGP(DLLC, LOGL_DEBUG, "Updated LLC message, CRC: %06x -> %06x\n", |
| 1269 | ghp->fcs, fcs); |
| 1270 | |
| 1271 | llc[llc_len - 3] = fcs & 0xff; |
| 1272 | llc[llc_len - 2] = (fcs >> 8) & 0xff; |
| 1273 | llc[llc_len - 1] = (fcs >> 16) & 0xff; |
| 1274 | } |
| 1275 | |
| 1276 | return have_patched; |
Jacob Erlbeck | 2f2aa2e | 2014-08-05 18:28:51 +0200 | [diff] [blame] | 1277 | } |
| 1278 | |
Jacob Erlbeck | cae8b0c | 2014-08-07 16:42:51 +0200 | [diff] [blame] | 1279 | static void gbprox_log_parse_context(struct gbproxy_parse_context *parse_ctx, |
| 1280 | const char *default_msg_name) |
| 1281 | { |
| 1282 | const char *msg_name = default_msg_name; |
| 1283 | const char *sep = ""; |
| 1284 | |
| 1285 | if (!parse_ctx->tlli_enc && |
| 1286 | !parse_ctx->ptmsi_enc && |
| 1287 | !parse_ctx->new_ptmsi_enc && |
| 1288 | !parse_ctx->imsi) |
| 1289 | return; |
| 1290 | |
| 1291 | if (parse_ctx->llc_msg_name) |
| 1292 | msg_name = parse_ctx->llc_msg_name; |
| 1293 | |
| 1294 | LOGP(DGPRS, LOGL_DEBUG, "%s: Got", msg_name); |
| 1295 | |
| 1296 | if (parse_ctx->tlli_enc) { |
| 1297 | LOGP(DGPRS, LOGL_DEBUG, "%s TLLI %08x", sep, parse_ctx->tlli); |
| 1298 | sep = ","; |
| 1299 | } |
| 1300 | |
| 1301 | if (parse_ctx->ptmsi_enc) { |
| 1302 | uint32_t ptmsi = GSM_RESERVED_TMSI; |
| 1303 | int ok; |
| 1304 | ok = parse_mi_tmsi(parse_ctx->ptmsi_enc, GSM48_TMSI_LEN, &ptmsi); |
| 1305 | LOGP(DGPRS, LOGL_DEBUG, "%s PTMSI %08x%s", |
| 1306 | sep, ptmsi, ok ? "" : " (parse error)"); |
| 1307 | sep = ","; |
| 1308 | } |
| 1309 | |
| 1310 | if (parse_ctx->new_ptmsi_enc) { |
| 1311 | uint32_t new_ptmsi = GSM_RESERVED_TMSI; |
| 1312 | int ok; |
| 1313 | ok = parse_mi_tmsi(parse_ctx->new_ptmsi_enc, GSM48_TMSI_LEN, |
| 1314 | &new_ptmsi); |
| 1315 | LOGP(DGPRS, LOGL_DEBUG, "%s new PTMSI %08x%s", |
| 1316 | sep, new_ptmsi, ok ? "" : " (parse error)"); |
| 1317 | sep = ","; |
| 1318 | } |
| 1319 | |
| 1320 | if (parse_ctx->imsi) { |
| 1321 | char mi_buf[200]; |
| 1322 | mi_buf[0] = '\0'; |
| 1323 | gsm48_mi_to_string(mi_buf, sizeof(mi_buf), |
| 1324 | parse_ctx->imsi, parse_ctx->imsi_len); |
| 1325 | LOGP(DGPRS, LOGL_DEBUG, "%s IMSI %s", |
| 1326 | sep, mi_buf); |
| 1327 | sep = ","; |
| 1328 | } |
| 1329 | LOGP(DGPRS, LOGL_DEBUG, "\n"); |
| 1330 | } |
| 1331 | |
Jacob Erlbeck | ccc5970 | 2014-08-07 20:18:47 +0200 | [diff] [blame^] | 1332 | static struct gbproxy_tlli_info *gbprox_update_state( |
| 1333 | struct gbproxy_peer *peer, time_t now, |
| 1334 | struct gbproxy_parse_context *parse_ctx) |
Jacob Erlbeck | 2f2aa2e | 2014-08-05 18:28:51 +0200 | [diff] [blame] | 1335 | { |
Jacob Erlbeck | 9ac42ba | 2014-08-06 18:55:15 +0200 | [diff] [blame] | 1336 | struct gbproxy_tlli_info *tlli_info = NULL; |
| 1337 | |
| 1338 | if (!peer->cfg->check_imsi) |
Jacob Erlbeck | ccc5970 | 2014-08-07 20:18:47 +0200 | [diff] [blame^] | 1339 | return NULL; |
Jacob Erlbeck | 9ac42ba | 2014-08-06 18:55:15 +0200 | [diff] [blame] | 1340 | |
| 1341 | if (parse_ctx->tlli_enc) |
| 1342 | tlli_info = gbprox_find_tlli(peer, parse_ctx->tlli); |
Jacob Erlbeck | 2f2aa2e | 2014-08-05 18:28:51 +0200 | [diff] [blame] | 1343 | |
Jacob Erlbeck | 2f2aa2e | 2014-08-05 18:28:51 +0200 | [diff] [blame] | 1344 | if (parse_ctx->g48_hdr) { |
| 1345 | switch (parse_ctx->g48_hdr->msg_type) { |
| 1346 | case GSM48_MT_GMM_ATTACH_REQ: |
| 1347 | rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_ATTACH_REQS]); |
| 1348 | break; |
| 1349 | |
| 1350 | case GSM48_MT_GMM_ATTACH_REJ: |
| 1351 | rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_ATTACH_REJS]); |
| 1352 | break; |
| 1353 | |
| 1354 | default: |
| 1355 | break; |
| 1356 | } |
| 1357 | } |
| 1358 | |
Jacob Erlbeck | cae8b0c | 2014-08-07 16:42:51 +0200 | [diff] [blame] | 1359 | gbprox_log_parse_context(parse_ctx, "BSSGP"); |
Jacob Erlbeck | 2f2aa2e | 2014-08-05 18:28:51 +0200 | [diff] [blame] | 1360 | |
Jacob Erlbeck | 9ac42ba | 2014-08-06 18:55:15 +0200 | [diff] [blame] | 1361 | if (parse_ctx->tlli_enc && parse_ctx->new_ptmsi_enc && |
| 1362 | parse_ctx->to_bss) { |
Jacob Erlbeck | fe7e670 | 2014-08-06 18:50:05 +0200 | [diff] [blame] | 1363 | /* A new PTMSI has been signaled in the message, |
| 1364 | * register new TLLI */ |
Jacob Erlbeck | 3b66d85 | 2014-08-05 15:53:43 +0200 | [diff] [blame] | 1365 | uint32_t new_ptmsi; |
Jacob Erlbeck | fe7e670 | 2014-08-06 18:50:05 +0200 | [diff] [blame] | 1366 | uint32_t new_tlli; |
Jacob Erlbeck | dc6dcdf | 2014-08-06 15:16:45 +0200 | [diff] [blame] | 1367 | if (!parse_mi_tmsi(parse_ctx->new_ptmsi_enc, GSM48_TMSI_LEN, |
Jacob Erlbeck | 3b66d85 | 2014-08-05 15:53:43 +0200 | [diff] [blame] | 1368 | &new_ptmsi)) { |
Jacob Erlbeck | 2f2aa2e | 2014-08-05 18:28:51 +0200 | [diff] [blame] | 1369 | LOGP(DGPRS, LOGL_ERROR, |
| 1370 | "Failed to parse new TLLI/PTMSI (current is %08x)\n", |
| 1371 | parse_ctx->tlli); |
Jacob Erlbeck | ccc5970 | 2014-08-07 20:18:47 +0200 | [diff] [blame^] | 1372 | return tlli_info; |
Jacob Erlbeck | 3b66d85 | 2014-08-05 15:53:43 +0200 | [diff] [blame] | 1373 | } |
Jacob Erlbeck | fe7e670 | 2014-08-06 18:50:05 +0200 | [diff] [blame] | 1374 | new_tlli = gprs_tmsi2tlli(new_ptmsi, TLLI_LOCAL); |
Jacob Erlbeck | 3b66d85 | 2014-08-05 15:53:43 +0200 | [diff] [blame] | 1375 | LOGP(DGPRS, LOGL_INFO, |
Jacob Erlbeck | fe7e670 | 2014-08-06 18:50:05 +0200 | [diff] [blame] | 1376 | "Got new TLLI/PTMSI %08x/%08x (current is %08x)\n", |
| 1377 | new_tlli, new_ptmsi, parse_ctx->tlli); |
Jacob Erlbeck | ccc5970 | 2014-08-07 20:18:47 +0200 | [diff] [blame^] | 1378 | if (tlli_info) { |
Jacob Erlbeck | 9ac42ba | 2014-08-06 18:55:15 +0200 | [diff] [blame] | 1379 | gbprox_reassign_tlli(tlli_info, peer, new_tlli); |
Jacob Erlbeck | ccc5970 | 2014-08-07 20:18:47 +0200 | [diff] [blame^] | 1380 | gbprox_touch_tlli(peer, tlli_info, now); |
| 1381 | } else { |
| 1382 | tlli_info = |
| 1383 | gbprox_register_tlli(peer, new_tlli, |
| 1384 | parse_ctx->imsi, |
| 1385 | parse_ctx->imsi_len, now); |
| 1386 | } |
Jacob Erlbeck | 9ac42ba | 2014-08-06 18:55:15 +0200 | [diff] [blame] | 1387 | } else if (parse_ctx->tlli_enc && parse_ctx->llc) { |
Jacob Erlbeck | ccc5970 | 2014-08-07 20:18:47 +0200 | [diff] [blame^] | 1388 | tlli_info = |
| 1389 | gbprox_register_tlli(peer, parse_ctx->tlli, |
| 1390 | parse_ctx->imsi, |
| 1391 | parse_ctx->imsi_len, now); |
| 1392 | } else if (tlli_info) { |
| 1393 | gbprox_touch_tlli(peer, tlli_info, now); |
Jacob Erlbeck | 2f2aa2e | 2014-08-05 18:28:51 +0200 | [diff] [blame] | 1394 | } |
| 1395 | |
Jacob Erlbeck | ccc5970 | 2014-08-07 20:18:47 +0200 | [diff] [blame^] | 1396 | if (parse_ctx->imsi && tlli_info && tlli_info->mi_data_len == 0) |
| 1397 | gbprox_update_tlli_info(tlli_info, |
| 1398 | parse_ctx->imsi, parse_ctx->imsi_len); |
| 1399 | |
| 1400 | return tlli_info; |
Jacob Erlbeck | 2f2aa2e | 2014-08-05 18:28:51 +0200 | [diff] [blame] | 1401 | } |
| 1402 | |
Jacob Erlbeck | ccc5970 | 2014-08-07 20:18:47 +0200 | [diff] [blame^] | 1403 | static void gbprox_update_state_after(struct gbproxy_peer *peer, |
| 1404 | struct gbproxy_tlli_info *tlli_info, |
| 1405 | time_t now, |
Jacob Erlbeck | 2f2aa2e | 2014-08-05 18:28:51 +0200 | [diff] [blame] | 1406 | struct gbproxy_parse_context *parse_ctx) |
| 1407 | { |
| 1408 | if (parse_ctx->invalidate_tlli) |
Jacob Erlbeck | 3b66d85 | 2014-08-05 15:53:43 +0200 | [diff] [blame] | 1409 | gbprox_unregister_tlli(peer, parse_ctx->tlli); |
Jacob Erlbeck | 985b46e | 2014-08-07 17:23:00 +0200 | [diff] [blame] | 1410 | |
| 1411 | gbprox_remove_stale_tllis(peer, now); |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1412 | } |
| 1413 | |
Jacob Erlbeck | 0f9273b | 2014-08-07 16:07:24 +0200 | [diff] [blame] | 1414 | static int gbprox_parse_bssgp(uint8_t *bssgp, size_t bssgp_len, |
| 1415 | struct gbproxy_parse_context *parse_ctx) |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 1416 | { |
| 1417 | struct bssgp_normal_hdr *bgph; |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 1418 | struct bssgp_ud_hdr *budh = NULL; |
Jacob Erlbeck | 4dc663f | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 1419 | struct tlv_parsed *tp = &parse_ctx->bssgp_tp; |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 1420 | uint8_t pdu_type; |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 1421 | uint8_t *data; |
| 1422 | size_t data_len; |
Jacob Erlbeck | 4dc663f | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 1423 | int rc; |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 1424 | |
Jacob Erlbeck | 4dc663f | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 1425 | if (bssgp_len < sizeof(struct bssgp_normal_hdr)) |
| 1426 | return 0; |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 1427 | |
Jacob Erlbeck | 4dc663f | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 1428 | bgph = (struct bssgp_normal_hdr *)bssgp; |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 1429 | pdu_type = bgph->pdu_type; |
| 1430 | |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 1431 | if (pdu_type == BSSGP_PDUT_UL_UNITDATA || |
| 1432 | pdu_type == BSSGP_PDUT_DL_UNITDATA) { |
Jacob Erlbeck | 4dc663f | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 1433 | if (bssgp_len < sizeof(struct bssgp_ud_hdr)) |
| 1434 | return 0; |
| 1435 | budh = (struct bssgp_ud_hdr *)bssgp; |
Jacob Erlbeck | 4303763 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 1436 | bgph = NULL; |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 1437 | data = budh->data; |
Jacob Erlbeck | 4dc663f | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 1438 | data_len = bssgp_len - sizeof(*budh); |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 1439 | } else { |
| 1440 | data = bgph->data; |
Jacob Erlbeck | 4dc663f | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 1441 | data_len = bssgp_len - sizeof(*bgph); |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 1442 | } |
| 1443 | |
Jacob Erlbeck | 4dc663f | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 1444 | if (bssgp_tlv_parse(tp, data, data_len) < 0) |
| 1445 | return 0; |
| 1446 | |
| 1447 | parse_ctx->pdu_type = pdu_type; |
| 1448 | parse_ctx->bud_hdr = budh; |
| 1449 | parse_ctx->bgp_hdr = bgph; |
| 1450 | parse_ctx->bssgp_data = data; |
| 1451 | parse_ctx->bssgp_data_len = data_len; |
| 1452 | |
| 1453 | if (budh) |
| 1454 | parse_ctx->tlli_enc = (uint8_t *)&budh->tlli; |
| 1455 | |
| 1456 | if (TLVP_PRESENT(tp, BSSGP_IE_ROUTEING_AREA)) |
| 1457 | parse_ctx->bssgp_raid_enc = (uint8_t *)TLVP_VAL(tp, BSSGP_IE_ROUTEING_AREA); |
| 1458 | |
| 1459 | if (TLVP_PRESENT(tp, BSSGP_IE_CELL_ID)) |
| 1460 | parse_ctx->bssgp_raid_enc = (uint8_t *)TLVP_VAL(tp, BSSGP_IE_CELL_ID); |
| 1461 | |
| 1462 | if (TLVP_PRESENT(tp, BSSGP_IE_IMSI)) { |
| 1463 | parse_ctx->imsi = (uint8_t *)TLVP_VAL(tp, BSSGP_IE_IMSI); |
| 1464 | parse_ctx->imsi_len = TLVP_LEN(tp, BSSGP_IE_IMSI); |
| 1465 | } |
| 1466 | |
Jacob Erlbeck | dc6dcdf | 2014-08-06 15:16:45 +0200 | [diff] [blame] | 1467 | if (TLVP_PRESENT(tp, BSSGP_IE_TLLI)) |
| 1468 | parse_ctx->tlli_enc = (uint8_t *)TLVP_VAL(tp, BSSGP_IE_TLLI); |
| 1469 | |
| 1470 | if (TLVP_PRESENT(tp, BSSGP_IE_TMSI) && pdu_type == BSSGP_PDUT_PAGING_PS) |
| 1471 | parse_ctx->ptmsi_enc = (uint8_t *)TLVP_VAL(tp, BSSGP_IE_TMSI); |
| 1472 | |
Jacob Erlbeck | 4dc663f | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 1473 | if (TLVP_PRESENT(tp, BSSGP_IE_LLC_PDU)) { |
| 1474 | uint8_t *llc = (uint8_t *)TLVP_VAL(tp, BSSGP_IE_LLC_PDU); |
| 1475 | size_t llc_len = TLVP_LEN(tp, BSSGP_IE_LLC_PDU); |
| 1476 | |
| 1477 | rc = gbprox_parse_llc(llc, llc_len, parse_ctx); |
| 1478 | if (!rc) |
| 1479 | return 0; |
| 1480 | |
| 1481 | parse_ctx->llc = llc; |
| 1482 | parse_ctx->llc_len = llc_len; |
| 1483 | } |
| 1484 | |
| 1485 | if (parse_ctx->tlli_enc) { |
| 1486 | uint32_t tmp_tlli; |
| 1487 | memcpy(&tmp_tlli, parse_ctx->tlli_enc, sizeof(tmp_tlli)); |
| 1488 | parse_ctx->tlli = ntohl(tmp_tlli); |
| 1489 | } |
| 1490 | |
| 1491 | return 1; |
| 1492 | } |
| 1493 | |
| 1494 | /* patch BSSGP message to use core_mcc/mnc on the SGSN side */ |
Jacob Erlbeck | 0f9273b | 2014-08-07 16:07:24 +0200 | [diff] [blame] | 1495 | static void gbprox_patch_bssgp(struct msgb *msg, uint8_t *bssgp, size_t bssgp_len, |
Jacob Erlbeck | ccc5970 | 2014-08-07 20:18:47 +0200 | [diff] [blame^] | 1496 | struct gbproxy_peer *peer, |
| 1497 | struct gbproxy_tlli_info *tlli_info, int *len_change, |
Jacob Erlbeck | 0f9273b | 2014-08-07 16:07:24 +0200 | [diff] [blame] | 1498 | struct gbproxy_parse_context *parse_ctx) |
| 1499 | __attribute__((nonnull)); |
| 1500 | static void gbprox_patch_bssgp(struct msgb *msg, uint8_t *bssgp, size_t bssgp_len, |
Jacob Erlbeck | ccc5970 | 2014-08-07 20:18:47 +0200 | [diff] [blame^] | 1501 | struct gbproxy_peer *peer, |
| 1502 | struct gbproxy_tlli_info *tlli_info, int *len_change, |
Jacob Erlbeck | 0f9273b | 2014-08-07 16:07:24 +0200 | [diff] [blame] | 1503 | struct gbproxy_parse_context *parse_ctx) |
Jacob Erlbeck | 4dc663f | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 1504 | { |
Jacob Erlbeck | 4dc663f | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 1505 | const char *err_info = NULL; |
| 1506 | int err_ctr = -1; |
Jacob Erlbeck | 0f9273b | 2014-08-07 16:07:24 +0200 | [diff] [blame] | 1507 | |
| 1508 | if (!patching_is_enabled(peer, GBPROX_PATCH_BSSGP)) |
| 1509 | return; |
| 1510 | |
| 1511 | if (parse_ctx->bssgp_raid_enc) |
| 1512 | gbprox_patch_raid(parse_ctx->bssgp_raid_enc, peer, |
| 1513 | parse_ctx->to_bss, "BSSGP"); |
| 1514 | |
| 1515 | if (!patching_is_enabled(peer, GBPROX_PATCH_LLC_ATTACH_REQ)) |
| 1516 | return; |
| 1517 | |
| 1518 | if (parse_ctx->need_decryption && |
| 1519 | patching_is_required(peer, GBPROX_PATCH_LLC_ATTACH)) { |
| 1520 | /* Patching LLC messages has been requested |
| 1521 | * explicitly, but the message (including the |
| 1522 | * type) is encrypted, so we possibly fail to |
| 1523 | * patch the LLC part of the message. */ |
| 1524 | err_ctr = GBPROX_PEER_CTR_PATCH_CRYPT_ERR; |
| 1525 | err_info = "GMM message is encrypted"; |
| 1526 | goto patch_error; |
| 1527 | } |
| 1528 | |
| 1529 | if (parse_ctx->llc) { |
| 1530 | uint8_t *llc = parse_ctx->llc; |
| 1531 | size_t llc_len = parse_ctx->llc_len; |
| 1532 | int llc_len_change = 0; |
| 1533 | |
Jacob Erlbeck | ccc5970 | 2014-08-07 20:18:47 +0200 | [diff] [blame^] | 1534 | gbprox_patch_llc(msg, llc, llc_len, peer, tlli_info, |
| 1535 | &llc_len_change, parse_ctx); |
Jacob Erlbeck | 0f9273b | 2014-08-07 16:07:24 +0200 | [diff] [blame] | 1536 | /* Note that the APN might have been resized here, but no |
| 1537 | * pointer int the parse_ctx will refer to an adress after the |
| 1538 | * APN. So it's possible to patch first and do the TLLI |
| 1539 | * handling afterwards. */ |
| 1540 | |
| 1541 | if (llc_len_change) { |
| 1542 | llc_len += llc_len_change; |
| 1543 | |
| 1544 | /* Fix LLC IE len */ |
| 1545 | /* TODO: This is a kludge, but the a pointer to the |
| 1546 | * start of the IE is not available here */ |
| 1547 | if (llc[-2] == BSSGP_IE_LLC_PDU && llc[-1] & 0x80) { |
| 1548 | /* most probably a one byte length */ |
| 1549 | if (llc_len > 127) { |
| 1550 | err_info = "Cannot increase size"; |
| 1551 | err_ctr = GBPROX_PEER_CTR_PATCH_ERR; |
| 1552 | goto patch_error; |
| 1553 | } |
| 1554 | llc[-1] = llc_len | 0x80; |
| 1555 | } else { |
| 1556 | llc[-2] = (llc_len >> 8) & 0x7f; |
| 1557 | llc[-1] = llc_len & 0xff; |
| 1558 | } |
| 1559 | *len_change += llc_len_change; |
| 1560 | } |
| 1561 | /* Note that the tp struct might contain invalid pointers here |
| 1562 | * if the LLC field has changed its size */ |
| 1563 | parse_ctx->llc_len = llc_len; |
| 1564 | } |
| 1565 | return; |
| 1566 | |
| 1567 | patch_error: |
| 1568 | OSMO_ASSERT(err_ctr >= 0); |
| 1569 | rate_ctr_inc(&peer->ctrg->ctr[err_ctr]); |
| 1570 | LOGP(DGPRS, LOGL_ERROR, |
| 1571 | "Failed to patch BSSGP message as requested: %s.\n", err_info); |
| 1572 | } |
| 1573 | |
| 1574 | /* patch BSSGP message to use core_mcc/mnc on the SGSN side */ |
| 1575 | static void gbprox_process_bssgp_message(struct gbproxy_config *cfg, |
| 1576 | struct msgb *msg, |
| 1577 | struct gbproxy_peer *peer, int to_bss) |
| 1578 | { |
| 1579 | struct gbproxy_parse_context parse_ctx = {0}; |
Jacob Erlbeck | 4dc663f | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 1580 | int rc; |
Jacob Erlbeck | 0f9273b | 2014-08-07 16:07:24 +0200 | [diff] [blame] | 1581 | int len_change = 0; |
Jacob Erlbeck | c404c08 | 2014-08-08 08:37:37 +0200 | [diff] [blame] | 1582 | time_t now; |
Jacob Erlbeck | ccc5970 | 2014-08-07 20:18:47 +0200 | [diff] [blame^] | 1583 | struct gbproxy_tlli_info *tlli_info; |
Jacob Erlbeck | 4dc663f | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 1584 | |
| 1585 | if (!cfg->core_mcc && !cfg->core_mnc && !cfg->core_apn) |
| 1586 | return; |
| 1587 | |
| 1588 | parse_ctx.to_bss = to_bss; |
| 1589 | |
Jacob Erlbeck | 0f9273b | 2014-08-07 16:07:24 +0200 | [diff] [blame] | 1590 | rc = gbprox_parse_bssgp(msgb_bssgph(msg), msgb_bssgp_len(msg), |
| 1591 | &parse_ctx); |
Jacob Erlbeck | 4dc663f | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 1592 | |
| 1593 | if (!rc) { |
| 1594 | if (!parse_ctx.need_decryption) { |
| 1595 | LOGP(DGPRS, LOGL_ERROR, |
| 1596 | "Failed to parse BSSGP/GMM message\n"); |
| 1597 | return; |
| 1598 | } |
| 1599 | } |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 1600 | |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 1601 | if (!peer && msgb_bvci(msg) >= 2) |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1602 | peer = peer_by_bvci(cfg, msgb_bvci(msg)); |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 1603 | |
| 1604 | if (!peer && !to_bss) |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1605 | peer = gbprox_peer_by_nsei(cfg, msgb_nsei(msg)); |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 1606 | |
| 1607 | if (!peer) |
Jacob Erlbeck | 4dc663f | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 1608 | peer = peer_by_bssgp_tlv(cfg, &parse_ctx.bssgp_tp); |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 1609 | |
| 1610 | if (!peer) { |
| 1611 | LOGP(DLLC, LOGL_INFO, |
| 1612 | "NSEI=%d(%s) patching: didn't find peer for message, " |
| 1613 | "PDU %d\n", |
Jacob Erlbeck | 4dc663f | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 1614 | msgb_nsei(msg), to_bss ? "SGSN" : "BSS", parse_ctx.pdu_type); |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 1615 | /* Increment counter */ |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1616 | rate_ctr_inc(&cfg->ctrg->ctr[GBPROX_GLOB_CTR_PATCH_PEER_ERR]); |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 1617 | return; |
| 1618 | } |
| 1619 | |
Jacob Erlbeck | c404c08 | 2014-08-08 08:37:37 +0200 | [diff] [blame] | 1620 | now = time(NULL); |
| 1621 | |
Jacob Erlbeck | ccc5970 | 2014-08-07 20:18:47 +0200 | [diff] [blame^] | 1622 | tlli_info = gbprox_update_state(peer, now, &parse_ctx); |
Jacob Erlbeck | 0727f9a | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1623 | |
Jacob Erlbeck | 0f9273b | 2014-08-07 16:07:24 +0200 | [diff] [blame] | 1624 | gbprox_patch_bssgp(msg, msgb_bssgph(msg), msgb_bssgp_len(msg), |
Jacob Erlbeck | ccc5970 | 2014-08-07 20:18:47 +0200 | [diff] [blame^] | 1625 | peer, tlli_info, &len_change, &parse_ctx); |
Jacob Erlbeck | 4dc663f | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 1626 | |
Jacob Erlbeck | ccc5970 | 2014-08-07 20:18:47 +0200 | [diff] [blame^] | 1627 | gbprox_update_state_after(peer, tlli_info, now, &parse_ctx); |
Jacob Erlbeck | 4dc663f | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 1628 | |
Jacob Erlbeck | f14bb91 | 2014-06-27 19:56:05 +0200 | [diff] [blame] | 1629 | return; |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 1630 | } |
| 1631 | |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1632 | /* feed a message down the NS-VC associated with the specified peer */ |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1633 | static int gbprox_relay2sgsn(struct gbproxy_config *cfg, struct msgb *old_msg, |
Holger Hans Peter Freyther | d64bf22 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 1634 | struct gbproxy_peer *peer, uint16_t ns_bvci) |
Harald Welte | f01709d | 2010-05-03 18:54:58 +0200 | [diff] [blame] | 1635 | { |
Harald Welte | 3fb22d6 | 2010-05-12 18:10:25 +0000 | [diff] [blame] | 1636 | /* create a copy of the message so the old one can |
| 1637 | * be free()d safely when we return from gbprox_rcvmsg() */ |
Holger Hans Peter Freyther | 8ac3a72 | 2014-08-04 11:52:52 +0200 | [diff] [blame] | 1638 | struct msgb *msg = gprs_msgb_copy(old_msg, "msgb_relay2sgsn"); |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1639 | int rc; |
Harald Welte | 3fb22d6 | 2010-05-12 18:10:25 +0000 | [diff] [blame] | 1640 | |
Jacob Erlbeck | 0f9273b | 2014-08-07 16:07:24 +0200 | [diff] [blame] | 1641 | gbprox_process_bssgp_message(cfg, msg, peer, 0); |
Jacob Erlbeck | 90a1fd1 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 1642 | |
Harald Welte | b8da061 | 2010-05-11 20:20:13 +0200 | [diff] [blame] | 1643 | DEBUGP(DGPRS, "NSEI=%u proxying BTS->SGSN (NS_BVCI=%u, NSEI=%u)\n", |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1644 | msgb_nsei(msg), ns_bvci, cfg->nsip_sgsn_nsei); |
Harald Welte | 6aa24d1 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 1645 | |
Harald Welte | f01709d | 2010-05-03 18:54:58 +0200 | [diff] [blame] | 1646 | msgb_bvci(msg) = ns_bvci; |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1647 | msgb_nsei(msg) = cfg->nsip_sgsn_nsei; |
Harald Welte | f01709d | 2010-05-03 18:54:58 +0200 | [diff] [blame] | 1648 | |
Harald Welte | 3ad3243 | 2010-05-03 19:05:10 +0200 | [diff] [blame] | 1649 | strip_ns_hdr(msg); |
| 1650 | |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1651 | rc = gprs_ns_sendmsg(bssgp_nsi, msg); |
| 1652 | if (rc < 0) |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1653 | rate_ctr_inc(&cfg->ctrg->ctr[GBPROX_GLOB_CTR_TX_ERR_SGSN]); |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1654 | |
| 1655 | return rc; |
Harald Welte | f01709d | 2010-05-03 18:54:58 +0200 | [diff] [blame] | 1656 | } |
| 1657 | |
Harald Welte | f01709d | 2010-05-03 18:54:58 +0200 | [diff] [blame] | 1658 | /* feed a message down the NS-VC associated with the specified peer */ |
Holger Hans Peter Freyther | d64bf22 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 1659 | static int gbprox_relay2peer(struct msgb *old_msg, struct gbproxy_peer *peer, |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1660 | uint16_t ns_bvci) |
| 1661 | { |
Harald Welte | 3fb22d6 | 2010-05-12 18:10:25 +0000 | [diff] [blame] | 1662 | /* create a copy of the message so the old one can |
| 1663 | * be free()d safely when we return from gbprox_rcvmsg() */ |
Holger Hans Peter Freyther | 8ac3a72 | 2014-08-04 11:52:52 +0200 | [diff] [blame] | 1664 | struct msgb *msg = gprs_msgb_copy(old_msg, "msgb_relay2peer"); |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1665 | int rc; |
Harald Welte | 3fb22d6 | 2010-05-12 18:10:25 +0000 | [diff] [blame] | 1666 | |
Harald Welte | 0cc900d | 2010-05-13 10:34:56 +0200 | [diff] [blame] | 1667 | 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] | 1668 | msgb_nsei(msg), ns_bvci, peer->nsei); |
Harald Welte | 6aa24d1 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 1669 | |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1670 | msgb_bvci(msg) = ns_bvci; |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1671 | msgb_nsei(msg) = peer->nsei; |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1672 | |
Harald Welte | 0cc900d | 2010-05-13 10:34:56 +0200 | [diff] [blame] | 1673 | /* 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] | 1674 | strip_ns_hdr(msg); |
| 1675 | |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1676 | rc = gprs_ns_sendmsg(bssgp_nsi, msg); |
| 1677 | if (rc < 0) |
| 1678 | rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_TX_ERR]); |
| 1679 | |
| 1680 | return rc; |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1681 | } |
| 1682 | |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1683 | static int block_unblock_peer(struct gbproxy_config *cfg, uint16_t ptp_bvci, uint8_t pdu_type) |
Harald Welte | 51b7d40 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 1684 | { |
Holger Hans Peter Freyther | d64bf22 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 1685 | struct gbproxy_peer *peer; |
Harald Welte | 51b7d40 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 1686 | |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1687 | peer = peer_by_bvci(cfg, ptp_bvci); |
Harald Welte | 51b7d40 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 1688 | if (!peer) { |
| 1689 | LOGP(DGPRS, LOGL_ERROR, "BVCI=%u: Cannot find BSS\n", |
| 1690 | ptp_bvci); |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1691 | rate_ctr_inc(&cfg->ctrg->ctr[GBPROX_GLOB_CTR_INV_BVCI]); |
Harald Welte | 51b7d40 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 1692 | return -ENOENT; |
| 1693 | } |
| 1694 | |
| 1695 | switch (pdu_type) { |
| 1696 | case BSSGP_PDUT_BVC_BLOCK_ACK: |
| 1697 | peer->blocked = 1; |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1698 | rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_BLOCKED]); |
Harald Welte | 51b7d40 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 1699 | break; |
| 1700 | case BSSGP_PDUT_BVC_UNBLOCK_ACK: |
| 1701 | peer->blocked = 0; |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1702 | rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_UNBLOCKED]); |
Harald Welte | 51b7d40 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 1703 | break; |
| 1704 | default: |
| 1705 | break; |
| 1706 | } |
| 1707 | return 0; |
| 1708 | } |
| 1709 | |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1710 | /* Send a message to a peer identified by ptp_bvci but using ns_bvci |
| 1711 | * in the NS hdr */ |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1712 | static int gbprox_relay2bvci(struct gbproxy_config *cfg, struct msgb *msg, uint16_t ptp_bvci, |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1713 | uint16_t ns_bvci) |
| 1714 | { |
Holger Hans Peter Freyther | d64bf22 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 1715 | struct gbproxy_peer *peer; |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1716 | |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1717 | peer = peer_by_bvci(cfg, ptp_bvci); |
Harald Welte | 0358aae | 2010-05-03 21:37:11 +0200 | [diff] [blame] | 1718 | if (!peer) { |
Harald Welte | 93048cf | 2010-05-13 14:14:56 +0200 | [diff] [blame] | 1719 | LOGP(DGPRS, LOGL_ERROR, "BVCI=%u: Cannot find BSS\n", |
Harald Welte | 0358aae | 2010-05-03 21:37:11 +0200 | [diff] [blame] | 1720 | ptp_bvci); |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1721 | rate_ctr_inc(&cfg->ctrg->ctr[GBPROX_GLOB_CTR_INV_BVCI]); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1722 | return -ENOENT; |
Harald Welte | 0358aae | 2010-05-03 21:37:11 +0200 | [diff] [blame] | 1723 | } |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1724 | |
Harald Welte | 3ad3243 | 2010-05-03 19:05:10 +0200 | [diff] [blame] | 1725 | return gbprox_relay2peer(msg, peer, ns_bvci); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1726 | } |
| 1727 | |
Harald Welte | a62e9fe | 2012-06-17 12:16:31 +0800 | [diff] [blame] | 1728 | int bssgp_prim_cb(struct osmo_prim_hdr *oph, void *ctx) |
| 1729 | { |
| 1730 | return 0; |
| 1731 | } |
| 1732 | |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1733 | /* Receive an incoming signalling message from a BSS-side NS-VC */ |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1734 | static int gbprox_rx_sig_from_bss(struct gbproxy_config *cfg, |
| 1735 | struct msgb *msg, uint16_t nsei, |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1736 | uint16_t ns_bvci) |
| 1737 | { |
Harald Welte | 2ac2e91 | 2010-05-03 16:30:59 +0200 | [diff] [blame] | 1738 | struct bssgp_normal_hdr *bgph = (struct bssgp_normal_hdr *) msgb_bssgph(msg); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1739 | struct tlv_parsed tp; |
| 1740 | uint8_t pdu_type = bgph->pdu_type; |
Harald Welte | 2ac2e91 | 2010-05-03 16:30:59 +0200 | [diff] [blame] | 1741 | int data_len = msgb_bssgp_len(msg) - sizeof(*bgph); |
Holger Hans Peter Freyther | d64bf22 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 1742 | struct gbproxy_peer *from_peer = NULL; |
Harald Welte | e49c829 | 2010-05-01 12:10:57 +0200 | [diff] [blame] | 1743 | struct gprs_ra_id raid; |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1744 | |
Harald Welte | 4127072 | 2011-02-06 17:13:12 +0100 | [diff] [blame] | 1745 | if (ns_bvci != 0 && ns_bvci != 1) { |
Harald Welte | 93048cf | 2010-05-13 14:14:56 +0200 | [diff] [blame] | 1746 | LOGP(DGPRS, LOGL_NOTICE, "NSEI=%u BVCI=%u is not signalling\n", |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1747 | nsei, ns_bvci); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1748 | return -EINVAL; |
| 1749 | } |
| 1750 | |
| 1751 | /* we actually should never see those two for BVCI == 0, but double-check |
| 1752 | * just to make sure */ |
| 1753 | if (pdu_type == BSSGP_PDUT_UL_UNITDATA || |
| 1754 | pdu_type == BSSGP_PDUT_DL_UNITDATA) { |
Harald Welte | 6aa24d1 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 1755 | LOGP(DGPRS, LOGL_NOTICE, "NSEI=%u UNITDATA not allowed in " |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1756 | "signalling\n", nsei); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1757 | return -EINVAL; |
| 1758 | } |
| 1759 | |
| 1760 | bssgp_tlv_parse(&tp, bgph->data, data_len); |
| 1761 | |
| 1762 | switch (pdu_type) { |
| 1763 | case BSSGP_PDUT_SUSPEND: |
| 1764 | case BSSGP_PDUT_RESUME: |
Jacob Erlbeck | 9d7268a | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 1765 | /* We implement RAI snooping during SUSPEND/RESUME, since it |
| 1766 | * establishes a relationsip between BVCI/peer and the routeing |
| 1767 | * area identification. The snooped information is then used |
| 1768 | * for routing the {SUSPEND,RESUME}_[N]ACK back to the correct |
| 1769 | * BSSGP */ |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1770 | if (!TLVP_PRESENT(&tp, BSSGP_IE_ROUTEING_AREA)) |
| 1771 | goto err_mand_ie; |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1772 | from_peer = gbprox_peer_by_nsei(cfg, nsei); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1773 | if (!from_peer) |
| 1774 | goto err_no_peer; |
Harald Welte | 8ba9d2d | 2010-05-12 00:07:29 +0200 | [diff] [blame] | 1775 | memcpy(from_peer->ra, TLVP_VAL(&tp, BSSGP_IE_ROUTEING_AREA), |
| 1776 | sizeof(from_peer->ra)); |
Harald Welte | f2fdefe | 2010-05-11 10:15:42 +0200 | [diff] [blame] | 1777 | gsm48_parse_ra(&raid, from_peer->ra); |
Harald Welte | 93048cf | 2010-05-13 14:14:56 +0200 | [diff] [blame] | 1778 | LOGP(DGPRS, LOGL_INFO, "NSEI=%u BSSGP SUSPEND/RESUME " |
Jacob Erlbeck | 9d7268a | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 1779 | "RAI snooping: RAI %u-%u-%u-%u behind BVCI=%u\n", |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1780 | nsei, raid.mcc, raid.mnc, raid.lac, |
| 1781 | raid.rac , from_peer->bvci); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1782 | /* FIXME: This only supports one BSS per RA */ |
| 1783 | break; |
Harald Welte | 6aa24d1 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 1784 | case BSSGP_PDUT_BVC_RESET: |
| 1785 | /* If we receive a BVC reset on the signalling endpoint, we |
| 1786 | * don't want the SGSN to reset, as the signalling endpoint |
| 1787 | * is common for all point-to-point BVCs (and thus all BTS) */ |
| 1788 | if (TLVP_PRESENT(&tp, BSSGP_IE_BVCI)) { |
Holger Hans Peter Freyther | 25eeaab | 2012-09-04 20:42:20 +0200 | [diff] [blame] | 1789 | uint16_t bvci = ntohs(tlvp_val16_unal(&tp, BSSGP_IE_BVCI)); |
Harald Welte | be6e25a | 2010-05-12 00:20:41 +0200 | [diff] [blame] | 1790 | LOGP(DGPRS, LOGL_INFO, "NSEI=%u Rx BVC RESET (BVCI=%u)\n", |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1791 | nsei, bvci); |
Harald Welte | 6aa24d1 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 1792 | if (bvci == 0) { |
| 1793 | /* FIXME: only do this if SGSN is alive! */ |
Harald Welte | b8da061 | 2010-05-11 20:20:13 +0200 | [diff] [blame] | 1794 | LOGP(DGPRS, LOGL_INFO, "NSEI=%u Tx fake " |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1795 | "BVC RESET ACK of BVCI=0\n", nsei); |
Harald Welte | 6aa24d1 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 1796 | return bssgp_tx_simple_bvci(BSSGP_PDUT_BVC_RESET_ACK, |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1797 | nsei, 0, ns_bvci); |
Harald Welte | 8ba9d2d | 2010-05-12 00:07:29 +0200 | [diff] [blame] | 1798 | } |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1799 | from_peer = peer_by_bvci(cfg, bvci); |
Harald Welte | 8ba9d2d | 2010-05-12 00:07:29 +0200 | [diff] [blame] | 1800 | if (!from_peer) { |
Harald Welte | 0358aae | 2010-05-03 21:37:11 +0200 | [diff] [blame] | 1801 | /* if a PTP-BVC is reset, and we don't know that |
| 1802 | * PTP-BVCI yet, we should allocate a new peer */ |
| 1803 | LOGP(DGPRS, LOGL_INFO, "Allocationg new peer for " |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1804 | "BVCI=%u via NSEI=%u\n", bvci, nsei); |
Holger Hans Peter Freyther | 60fa5b9 | 2014-08-04 17:10:08 +0200 | [diff] [blame] | 1805 | from_peer = gbproxy_peer_alloc(cfg, bvci); |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1806 | from_peer->nsei = nsei; |
Harald Welte | 6aa24d1 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 1807 | } |
Jacob Erlbeck | d0a9b50 | 2013-10-24 12:48:56 +0200 | [diff] [blame] | 1808 | |
| 1809 | if (!check_peer_nsei(from_peer, nsei)) |
| 1810 | from_peer->nsei = nsei; |
| 1811 | |
Harald Welte | 8ba9d2d | 2010-05-12 00:07:29 +0200 | [diff] [blame] | 1812 | if (TLVP_PRESENT(&tp, BSSGP_IE_CELL_ID)) { |
| 1813 | struct gprs_ra_id raid; |
| 1814 | /* We have a Cell Identifier present in this |
| 1815 | * PDU, this means we can extend our local |
| 1816 | * state information about this particular cell |
| 1817 | * */ |
| 1818 | memcpy(from_peer->ra, |
| 1819 | TLVP_VAL(&tp, BSSGP_IE_CELL_ID), |
| 1820 | sizeof(from_peer->ra)); |
| 1821 | gsm48_parse_ra(&raid, from_peer->ra); |
| 1822 | LOGP(DGPRS, LOGL_INFO, "NSEI=%u/BVCI=%u " |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1823 | "Cell ID %u-%u-%u-%u\n", nsei, |
Harald Welte | 8ba9d2d | 2010-05-12 00:07:29 +0200 | [diff] [blame] | 1824 | bvci, raid.mcc, raid.mnc, raid.lac, |
| 1825 | raid.rac); |
| 1826 | } |
Harald Welte | 6aa24d1 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 1827 | } |
| 1828 | break; |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1829 | } |
| 1830 | |
Harald Welte | b8da061 | 2010-05-11 20:20:13 +0200 | [diff] [blame] | 1831 | /* Normally, we can simply pass on all signalling messages from BSS to |
| 1832 | * SGSN */ |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1833 | return gbprox_relay2sgsn(cfg, msg, from_peer, ns_bvci); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1834 | err_no_peer: |
Jacob Erlbeck | 700b873 | 2013-10-18 13:04:48 +0200 | [diff] [blame] | 1835 | 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] | 1836 | nsei); |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1837 | rate_ctr_inc(&cfg->ctrg->ctr[GBPROX_GLOB_CTR_INV_NSEI]); |
Harald Welte | 874acec | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1838 | return bssgp_tx_status(BSSGP_CAUSE_UNKNOWN_BVCI, NULL, msg); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1839 | err_mand_ie: |
Harald Welte | 874acec | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1840 | LOGP(DGPRS, LOGL_ERROR, "NSEI=%u(BSS) missing mandatory RA IE\n", |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1841 | nsei); |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1842 | rate_ctr_inc(&cfg->ctrg->ctr[GBPROX_GLOB_CTR_PROTO_ERR_BSS]); |
Harald Welte | 874acec | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1843 | return bssgp_tx_status(BSSGP_CAUSE_MISSING_MAND_IE, NULL, msg); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1844 | } |
| 1845 | |
| 1846 | /* Receive paging request from SGSN, we need to relay to proper BSS */ |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1847 | static int gbprox_rx_paging(struct gbproxy_config *cfg, struct msgb *msg, struct tlv_parsed *tp, |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1848 | uint32_t nsei, uint16_t ns_bvci) |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1849 | { |
Holger Hans Peter Freyther | d64bf22 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 1850 | struct gbproxy_peer *peer = NULL; |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1851 | int errctr = GBPROX_GLOB_CTR_PROTO_ERR_SGSN; |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1852 | |
Harald Welte | 93048cf | 2010-05-13 14:14:56 +0200 | [diff] [blame] | 1853 | LOGP(DGPRS, LOGL_INFO, "NSEI=%u(SGSN) BSSGP PAGING ", |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1854 | nsei); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1855 | if (TLVP_PRESENT(tp, BSSGP_IE_BVCI)) { |
Holger Hans Peter Freyther | 25eeaab | 2012-09-04 20:42:20 +0200 | [diff] [blame] | 1856 | uint16_t bvci = ntohs(tlvp_val16_unal(tp, BSSGP_IE_BVCI)); |
Harald Welte | 93048cf | 2010-05-13 14:14:56 +0200 | [diff] [blame] | 1857 | LOGPC(DGPRS, LOGL_INFO, "routing by BVCI to peer BVCI=%u\n", |
| 1858 | bvci); |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1859 | errctr = GBPROX_GLOB_CTR_OTHER_ERR; |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1860 | } else if (TLVP_PRESENT(tp, BSSGP_IE_ROUTEING_AREA)) { |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1861 | peer = peer_by_rai(cfg, TLVP_VAL(tp, BSSGP_IE_ROUTEING_AREA)); |
Jacob Erlbeck | 9d7268a | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 1862 | 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] | 1863 | peer ? peer->bvci : -1); |
Jacob Erlbeck | 9d7268a | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 1864 | errctr = GBPROX_GLOB_CTR_INV_RAI; |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1865 | } else if (TLVP_PRESENT(tp, BSSGP_IE_LOCATION_AREA)) { |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1866 | peer = peer_by_lai(cfg, TLVP_VAL(tp, BSSGP_IE_LOCATION_AREA)); |
Jacob Erlbeck | 9d7268a | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 1867 | 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] | 1868 | peer ? peer->bvci : -1); |
Jacob Erlbeck | 9d7268a | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 1869 | errctr = GBPROX_GLOB_CTR_INV_LAI; |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1870 | } else |
Harald Welte | 93048cf | 2010-05-13 14:14:56 +0200 | [diff] [blame] | 1871 | LOGPC(DGPRS, LOGL_INFO, "\n"); |
| 1872 | |
| 1873 | if (!peer) { |
| 1874 | LOGP(DGPRS, LOGL_ERROR, "NSEI=%u(SGSN) BSSGP PAGING: " |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1875 | "unable to route, missing IE\n", nsei); |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1876 | rate_ctr_inc(&cfg->ctrg->ctr[errctr]); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1877 | return -EINVAL; |
Harald Welte | 93048cf | 2010-05-13 14:14:56 +0200 | [diff] [blame] | 1878 | } |
| 1879 | return gbprox_relay2peer(msg, peer, ns_bvci); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1880 | } |
| 1881 | |
Harald Welte | 874acec | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1882 | /* Receive an incoming BVC-RESET message from the SGSN */ |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1883 | static int rx_reset_from_sgsn(struct gbproxy_config *cfg, |
| 1884 | struct msgb *msg, struct tlv_parsed *tp, |
| 1885 | uint32_t nsei, uint16_t ns_bvci) |
Harald Welte | 874acec | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1886 | { |
Holger Hans Peter Freyther | d64bf22 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 1887 | struct gbproxy_peer *peer; |
Harald Welte | 874acec | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1888 | uint16_t ptp_bvci; |
| 1889 | |
| 1890 | if (!TLVP_PRESENT(tp, BSSGP_IE_BVCI)) { |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1891 | rate_ctr_inc(&cfg->ctrg-> |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1892 | ctr[GBPROX_GLOB_CTR_PROTO_ERR_SGSN]); |
Harald Welte | 874acec | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1893 | return bssgp_tx_status(BSSGP_CAUSE_MISSING_MAND_IE, |
| 1894 | NULL, msg); |
| 1895 | } |
Holger Hans Peter Freyther | 25eeaab | 2012-09-04 20:42:20 +0200 | [diff] [blame] | 1896 | ptp_bvci = ntohs(tlvp_val16_unal(tp, BSSGP_IE_BVCI)); |
Harald Welte | 874acec | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1897 | |
| 1898 | if (ptp_bvci >= 2) { |
| 1899 | /* A reset for a PTP BVC was received, forward it to its |
| 1900 | * respective peer */ |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1901 | peer = peer_by_bvci(cfg, ptp_bvci); |
Harald Welte | 874acec | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1902 | if (!peer) { |
Harald Welte | 93048cf | 2010-05-13 14:14:56 +0200 | [diff] [blame] | 1903 | LOGP(DGPRS, LOGL_ERROR, "NSEI=%u BVCI=%u: Cannot find BSS\n", |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1904 | nsei, ptp_bvci); |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1905 | rate_ctr_inc(&cfg->ctrg-> |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1906 | ctr[GBPROX_GLOB_CTR_INV_BVCI]); |
Harald Welte | 874acec | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1907 | return bssgp_tx_status(BSSGP_CAUSE_UNKNOWN_BVCI, |
| 1908 | NULL, msg); |
| 1909 | } |
| 1910 | return gbprox_relay2peer(msg, peer, ns_bvci); |
| 1911 | } |
| 1912 | |
| 1913 | /* A reset for the Signalling entity has been received |
| 1914 | * from the SGSN. As the signalling BVCI is shared |
| 1915 | * among all the BSS's that we multiplex, it needs to |
| 1916 | * be relayed */ |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1917 | llist_for_each_entry(peer, &cfg->bts_peers, list) |
Harald Welte | 874acec | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1918 | gbprox_relay2peer(msg, peer, ns_bvci); |
| 1919 | |
| 1920 | return 0; |
| 1921 | } |
| 1922 | |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1923 | /* Receive an incoming signalling message from the SGSN-side NS-VC */ |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1924 | static int gbprox_rx_sig_from_sgsn(struct gbproxy_config *cfg, |
| 1925 | struct msgb *msg, uint32_t nsei, |
| 1926 | uint16_t ns_bvci) |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1927 | { |
Harald Welte | 2ac2e91 | 2010-05-03 16:30:59 +0200 | [diff] [blame] | 1928 | struct bssgp_normal_hdr *bgph = (struct bssgp_normal_hdr *) msgb_bssgph(msg); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1929 | struct tlv_parsed tp; |
| 1930 | uint8_t pdu_type = bgph->pdu_type; |
Harald Welte | 2ac2e91 | 2010-05-03 16:30:59 +0200 | [diff] [blame] | 1931 | int data_len = msgb_bssgp_len(msg) - sizeof(*bgph); |
Holger Hans Peter Freyther | d64bf22 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 1932 | struct gbproxy_peer *peer; |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1933 | uint16_t bvci; |
| 1934 | int rc = 0; |
| 1935 | |
Harald Welte | 4127072 | 2011-02-06 17:13:12 +0100 | [diff] [blame] | 1936 | if (ns_bvci != 0 && ns_bvci != 1) { |
Harald Welte | 93048cf | 2010-05-13 14:14:56 +0200 | [diff] [blame] | 1937 | LOGP(DGPRS, LOGL_NOTICE, "NSEI=%u(SGSN) BVCI=%u is not " |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1938 | "signalling\n", nsei, ns_bvci); |
Harald Welte | 874acec | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1939 | /* FIXME: Send proper error message */ |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1940 | return -EINVAL; |
| 1941 | } |
| 1942 | |
| 1943 | /* we actually should never see those two for BVCI == 0, but double-check |
| 1944 | * just to make sure */ |
| 1945 | if (pdu_type == BSSGP_PDUT_UL_UNITDATA || |
| 1946 | pdu_type == BSSGP_PDUT_DL_UNITDATA) { |
Harald Welte | 6aa24d1 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 1947 | LOGP(DGPRS, LOGL_NOTICE, "NSEI=%u(SGSN) UNITDATA not allowed in " |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1948 | "signalling\n", nsei); |
Harald Welte | 874acec | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1949 | return bssgp_tx_status(BSSGP_CAUSE_PROTO_ERR_UNSPEC, NULL, msg); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1950 | } |
| 1951 | |
| 1952 | rc = bssgp_tlv_parse(&tp, bgph->data, data_len); |
| 1953 | |
| 1954 | switch (pdu_type) { |
Harald Welte | 874acec | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1955 | case BSSGP_PDUT_BVC_RESET: |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1956 | rc = rx_reset_from_sgsn(cfg, msg, &tp, nsei, ns_bvci); |
Harald Welte | 874acec | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1957 | break; |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1958 | case BSSGP_PDUT_FLUSH_LL: |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1959 | case BSSGP_PDUT_BVC_RESET_ACK: |
| 1960 | /* simple case: BVCI IE is mandatory */ |
| 1961 | if (!TLVP_PRESENT(&tp, BSSGP_IE_BVCI)) |
| 1962 | goto err_mand_ie; |
Holger Hans Peter Freyther | 25eeaab | 2012-09-04 20:42:20 +0200 | [diff] [blame] | 1963 | bvci = ntohs(tlvp_val16_unal(&tp, BSSGP_IE_BVCI)); |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1964 | rc = gbprox_relay2bvci(cfg, msg, bvci, ns_bvci); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1965 | break; |
| 1966 | case BSSGP_PDUT_PAGING_PS: |
| 1967 | case BSSGP_PDUT_PAGING_CS: |
Jacob Erlbeck | 9d7268a | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 1968 | /* process the paging request (LAI/RAI lookup) */ |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1969 | rc = gbprox_rx_paging(cfg, msg, &tp, nsei, ns_bvci); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1970 | break; |
| 1971 | case BSSGP_PDUT_STATUS: |
Harald Welte | 874acec | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1972 | /* Some exception has occurred */ |
Harald Welte | 6aa24d1 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 1973 | LOGP(DGPRS, LOGL_NOTICE, |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1974 | "NSEI=%u(SGSN) BSSGP STATUS ", nsei); |
Harald Welte | 874acec | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1975 | if (!TLVP_PRESENT(&tp, BSSGP_IE_CAUSE)) { |
| 1976 | LOGPC(DGPRS, LOGL_NOTICE, "\n"); |
| 1977 | goto err_mand_ie; |
| 1978 | } |
| 1979 | LOGPC(DGPRS, LOGL_NOTICE, |
| 1980 | "cause=0x%02x(%s) ", *TLVP_VAL(&tp, BSSGP_IE_CAUSE), |
| 1981 | bssgp_cause_str(*TLVP_VAL(&tp, BSSGP_IE_CAUSE))); |
| 1982 | if (TLVP_PRESENT(&tp, BSSGP_IE_BVCI)) { |
Holger Hans Peter Freyther | 25eeaab | 2012-09-04 20:42:20 +0200 | [diff] [blame] | 1983 | uint16_t bvci = tlvp_val16_unal(&tp, BSSGP_IE_BVCI); |
Harald Welte | 874acec | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1984 | LOGPC(DGPRS, LOGL_NOTICE, |
Holger Hans Peter Freyther | 25eeaab | 2012-09-04 20:42:20 +0200 | [diff] [blame] | 1985 | "BVCI=%u\n", ntohs(bvci)); |
Harald Welte | 874acec | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1986 | } else |
| 1987 | LOGPC(DGPRS, LOGL_NOTICE, "\n"); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1988 | break; |
| 1989 | /* those only exist in the SGSN -> BSS direction */ |
| 1990 | case BSSGP_PDUT_SUSPEND_ACK: |
| 1991 | case BSSGP_PDUT_SUSPEND_NACK: |
| 1992 | case BSSGP_PDUT_RESUME_ACK: |
| 1993 | case BSSGP_PDUT_RESUME_NACK: |
Jacob Erlbeck | 9d7268a | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 1994 | /* RAI IE is mandatory */ |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1995 | if (!TLVP_PRESENT(&tp, BSSGP_IE_ROUTEING_AREA)) |
| 1996 | goto err_mand_ie; |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1997 | peer = peer_by_rai(cfg, TLVP_VAL(&tp, BSSGP_IE_ROUTEING_AREA)); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1998 | if (!peer) |
| 1999 | goto err_no_peer; |
Harald Welte | 3ad3243 | 2010-05-03 19:05:10 +0200 | [diff] [blame] | 2000 | rc = gbprox_relay2peer(msg, peer, ns_bvci); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 2001 | break; |
Harald Welte | 51b7d40 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 2002 | case BSSGP_PDUT_BVC_BLOCK_ACK: |
| 2003 | case BSSGP_PDUT_BVC_UNBLOCK_ACK: |
| 2004 | if (!TLVP_PRESENT(&tp, BSSGP_IE_BVCI)) |
| 2005 | goto err_mand_ie; |
Holger Hans Peter Freyther | 25eeaab | 2012-09-04 20:42:20 +0200 | [diff] [blame] | 2006 | bvci = ntohs(tlvp_val16_unal(&tp, BSSGP_IE_BVCI)); |
Harald Welte | 51b7d40 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 2007 | if (bvci == 0) { |
| 2008 | LOGP(DGPRS, LOGL_NOTICE, "NSEI=%u(SGSN) BSSGP " |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 2009 | "%sBLOCK_ACK for signalling BVCI ?!?\n", nsei, |
Harald Welte | 51b7d40 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 2010 | pdu_type == BSSGP_PDUT_BVC_UNBLOCK_ACK ? "UN":""); |
| 2011 | /* should we send STATUS ? */ |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 2012 | rate_ctr_inc(&cfg->ctrg-> |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 2013 | ctr[GBPROX_GLOB_CTR_INV_BVCI]); |
Harald Welte | 51b7d40 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 2014 | } else { |
| 2015 | /* Mark BVC as (un)blocked */ |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 2016 | block_unblock_peer(cfg, bvci, pdu_type); |
Harald Welte | 51b7d40 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 2017 | } |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 2018 | rc = gbprox_relay2bvci(cfg, msg, bvci, ns_bvci); |
Harald Welte | 51b7d40 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 2019 | break; |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 2020 | case BSSGP_PDUT_SGSN_INVOKE_TRACE: |
Harald Welte | 6aa24d1 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 2021 | LOGP(DGPRS, LOGL_ERROR, |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 2022 | "NSEI=%u(SGSN) BSSGP INVOKE TRACE not supported\n",nsei); |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 2023 | rate_ctr_inc(&cfg->ctrg-> |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 2024 | ctr[GBPROX_GLOB_CTR_NOT_SUPPORTED_SGSN]); |
Harald Welte | 874acec | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 2025 | rc = bssgp_tx_status(BSSGP_CAUSE_PDU_INCOMP_FEAT, NULL, msg); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 2026 | break; |
| 2027 | default: |
Harald Welte | be6e25a | 2010-05-12 00:20:41 +0200 | [diff] [blame] | 2028 | LOGP(DGPRS, LOGL_NOTICE, "BSSGP PDU type 0x%02x unknown\n", |
| 2029 | pdu_type); |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 2030 | rate_ctr_inc(&cfg->ctrg-> |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 2031 | ctr[GBPROX_GLOB_CTR_PROTO_ERR_SGSN]); |
Harald Welte | 874acec | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 2032 | rc = bssgp_tx_status(BSSGP_CAUSE_PROTO_ERR_UNSPEC, NULL, msg); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 2033 | break; |
| 2034 | } |
| 2035 | |
| 2036 | return rc; |
| 2037 | err_mand_ie: |
Harald Welte | 0358aae | 2010-05-03 21:37:11 +0200 | [diff] [blame] | 2038 | LOGP(DGPRS, LOGL_ERROR, "NSEI=%u(SGSN) missing mandatory IE\n", |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 2039 | nsei); |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 2040 | rate_ctr_inc(&cfg->ctrg-> |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 2041 | ctr[GBPROX_GLOB_CTR_PROTO_ERR_SGSN]); |
Harald Welte | 874acec | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 2042 | return bssgp_tx_status(BSSGP_CAUSE_MISSING_MAND_IE, NULL, msg); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 2043 | err_no_peer: |
Jacob Erlbeck | 9d7268a | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 2044 | 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] | 2045 | nsei); |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 2046 | rate_ctr_inc(&cfg->ctrg-> ctr[GBPROX_GLOB_CTR_INV_RAI]); |
Harald Welte | 874acec | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 2047 | return bssgp_tx_status(BSSGP_CAUSE_UNKNOWN_BVCI, NULL, msg); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 2048 | } |
| 2049 | |
| 2050 | /* Main input function for Gb proxy */ |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 2051 | int gbprox_rcvmsg(struct gbproxy_config *cfg, struct msgb *msg, uint16_t nsei, |
| 2052 | uint16_t ns_bvci, uint16_t nsvci) |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 2053 | { |
Harald Welte | f01709d | 2010-05-03 18:54:58 +0200 | [diff] [blame] | 2054 | int rc; |
Holger Hans Peter Freyther | d64bf22 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 2055 | struct gbproxy_peer *peer; |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 2056 | int remote_end_is_sgsn = nsei == cfg->nsip_sgsn_nsei; |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 2057 | |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 2058 | if (remote_end_is_sgsn) |
Jacob Erlbeck | 0f9273b | 2014-08-07 16:07:24 +0200 | [diff] [blame] | 2059 | gbprox_process_bssgp_message(cfg, msg, NULL, 1); |
Jacob Erlbeck | 2504bc4 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 2060 | |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 2061 | /* Only BVCI=0 messages need special treatment */ |
| 2062 | if (ns_bvci == 0 || ns_bvci == 1) { |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 2063 | if (remote_end_is_sgsn) |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 2064 | rc = gbprox_rx_sig_from_sgsn(cfg, msg, nsei, ns_bvci); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 2065 | else |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 2066 | rc = gbprox_rx_sig_from_bss(cfg, msg, nsei, ns_bvci); |
Harald Welte | f01709d | 2010-05-03 18:54:58 +0200 | [diff] [blame] | 2067 | } else { |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 2068 | peer = peer_by_bvci(cfg, ns_bvci); |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 2069 | |
Harald Welte | f01709d | 2010-05-03 18:54:58 +0200 | [diff] [blame] | 2070 | /* All other BVCI are PTP and thus can be simply forwarded */ |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 2071 | if (!remote_end_is_sgsn) { |
| 2072 | if (peer) |
| 2073 | check_peer_nsei(peer, nsei); |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 2074 | return gbprox_relay2sgsn(cfg, msg, peer, ns_bvci); |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 2075 | } |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 2076 | |
Harald Welte | 51b7d40 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 2077 | /* else: SGSN -> BSS direction */ |
Harald Welte | 51b7d40 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 2078 | if (!peer) { |
Jacob Erlbeck | 901b9a4 | 2013-10-18 22:12:17 +0200 | [diff] [blame] | 2079 | LOGP(DGPRS, LOGL_INFO, "Didn't find peer for " |
| 2080 | "BVCI=%u for message from NSVC=%u/NSEI=%u (SGSN)\n", |
| 2081 | ns_bvci, nsvci, nsei); |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 2082 | rate_ctr_inc(&cfg->ctrg-> |
Jacob Erlbeck | 901b9a4 | 2013-10-18 22:12:17 +0200 | [diff] [blame] | 2083 | ctr[GBPROX_GLOB_CTR_INV_BVCI]); |
| 2084 | return bssgp_tx_status(BSSGP_CAUSE_UNKNOWN_BVCI, |
| 2085 | &ns_bvci, msg); |
Harald Welte | 51b7d40 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 2086 | } |
| 2087 | if (peer->blocked) { |
| 2088 | LOGP(DGPRS, LOGL_NOTICE, "Dropping PDU for " |
| 2089 | "blocked BVCI=%u via NSVC=%u/NSEI=%u\n", |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 2090 | ns_bvci, nsvci, nsei); |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 2091 | rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_DROPPED]); |
Harald Welte | 51b7d40 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 2092 | return bssgp_tx_status(BSSGP_CAUSE_BVCI_BLOCKED, NULL, msg); |
| 2093 | } |
| 2094 | rc = gbprox_relay2peer(msg, peer, ns_bvci); |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 2095 | } |
| 2096 | |
Harald Welte | f01709d | 2010-05-03 18:54:58 +0200 | [diff] [blame] | 2097 | return rc; |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 2098 | } |
Harald Welte | b34e2c1 | 2010-05-11 05:49:43 +0200 | [diff] [blame] | 2099 | |
Harald Welte | 9ee404a | 2010-05-14 11:53:08 +0000 | [diff] [blame] | 2100 | int gbprox_reset_persistent_nsvcs(struct gprs_ns_inst *nsi) |
| 2101 | { |
| 2102 | struct gprs_nsvc *nsvc; |
| 2103 | |
| 2104 | llist_for_each_entry(nsvc, &nsi->gprs_nsvcs, list) { |
| 2105 | if (!nsvc->persistent) |
| 2106 | continue; |
| 2107 | gprs_nsvc_reset(nsvc, NS_CAUSE_OM_INTERVENTION); |
| 2108 | } |
| 2109 | return 0; |
| 2110 | } |
| 2111 | |
Harald Welte | 5bb0d36 | 2010-05-11 06:34:24 +0200 | [diff] [blame] | 2112 | /* Signal handler for signals from NS layer */ |
| 2113 | int gbprox_signal(unsigned int subsys, unsigned int signal, |
| 2114 | void *handler_data, void *signal_data) |
| 2115 | { |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 2116 | struct gbproxy_config *cfg = handler_data; |
Harald Welte | 5bb0d36 | 2010-05-11 06:34:24 +0200 | [diff] [blame] | 2117 | struct ns_signal_data *nssd = signal_data; |
| 2118 | struct gprs_nsvc *nsvc = nssd->nsvc; |
Holger Hans Peter Freyther | d64bf22 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 2119 | struct gbproxy_peer *peer; |
Harald Welte | 5bb0d36 | 2010-05-11 06:34:24 +0200 | [diff] [blame] | 2120 | |
Harald Welte | 7ed98e3 | 2012-06-16 16:40:42 +0800 | [diff] [blame] | 2121 | if (subsys != SS_L_NS) |
Harald Welte | 5bb0d36 | 2010-05-11 06:34:24 +0200 | [diff] [blame] | 2122 | return 0; |
| 2123 | |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 2124 | if (signal == S_NS_RESET && nsvc->nsei == cfg->nsip_sgsn_nsei) { |
Harald Welte | 15cbb0e | 2010-05-11 18:29:44 +0200 | [diff] [blame] | 2125 | /* We have received a NS-RESET from the NSEI and NSVC |
| 2126 | * of the SGSN. This might happen with SGSN that start |
| 2127 | * their own NS-RESET procedure without waiting for our |
| 2128 | * NS-RESET */ |
| 2129 | nsvc->remote_end_is_sgsn = 1; |
| 2130 | } |
| 2131 | |
Harald Welte | fa41cb7 | 2010-05-12 13:28:25 +0000 | [diff] [blame] | 2132 | if (signal == S_NS_ALIVE_EXP && nsvc->remote_end_is_sgsn) { |
| 2133 | LOGP(DGPRS, LOGL_NOTICE, "Tns alive expired too often, " |
| 2134 | "re-starting RESET procedure\n"); |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 2135 | rate_ctr_inc(&cfg->ctrg-> |
Jacob Erlbeck | 174bad4 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 2136 | ctr[GBPROX_GLOB_CTR_RESTART_RESET_SGSN]); |
Harald Welte | a529c07 | 2012-06-17 12:25:53 +0800 | [diff] [blame] | 2137 | gprs_ns_nsip_connect(nsvc->nsi, &nsvc->ip.bts_addr, |
| 2138 | nsvc->nsei, nsvc->nsvci); |
Harald Welte | fa41cb7 | 2010-05-12 13:28:25 +0000 | [diff] [blame] | 2139 | } |
| 2140 | |
Harald Welte | db2a2d5 | 2011-02-06 16:33:29 +0100 | [diff] [blame] | 2141 | if (!nsvc->remote_end_is_sgsn) { |
| 2142 | /* from BSS to SGSN */ |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 2143 | peer = gbprox_peer_by_nsei(cfg, nsvc->nsei); |
Harald Welte | db2a2d5 | 2011-02-06 16:33:29 +0100 | [diff] [blame] | 2144 | if (!peer) { |
| 2145 | LOGP(DGPRS, LOGL_NOTICE, "signal %u for unknown peer " |
| 2146 | "NSEI=%u/NSVCI=%u\n", signal, nsvc->nsei, |
| 2147 | nsvc->nsvci); |
| 2148 | return 0; |
| 2149 | } |
Harald Welte | 5bb0d36 | 2010-05-11 06:34:24 +0200 | [diff] [blame] | 2150 | switch (signal) { |
| 2151 | case S_NS_RESET: |
Harald Welte | 5bb0d36 | 2010-05-11 06:34:24 +0200 | [diff] [blame] | 2152 | case S_NS_BLOCK: |
Harald Welte | db2a2d5 | 2011-02-06 16:33:29 +0100 | [diff] [blame] | 2153 | if (!peer->blocked) |
| 2154 | break; |
| 2155 | LOGP(DGPRS, LOGL_NOTICE, "Converting NS_RESET from " |
| 2156 | "NSEI=%u/NSVCI=%u into BSSGP_BVC_BLOCK to SGSN\n", |
| 2157 | nsvc->nsei, nsvc->nsvci); |
| 2158 | bssgp_tx_simple_bvci(BSSGP_PDUT_BVC_BLOCK, nsvc->nsei, |
| 2159 | peer->bvci, 0); |
Harald Welte | 5bb0d36 | 2010-05-11 06:34:24 +0200 | [diff] [blame] | 2160 | break; |
Harald Welte | db2a2d5 | 2011-02-06 16:33:29 +0100 | [diff] [blame] | 2161 | } |
| 2162 | } else { |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 2163 | /* Forward this message to all NS-VC to BSS */ |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 2164 | struct gprs_ns_inst *nsi = cfg->nsi; |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 2165 | struct gprs_nsvc *next_nsvc; |
| 2166 | |
| 2167 | llist_for_each_entry(next_nsvc, &nsi->gprs_nsvcs, list) { |
| 2168 | if (next_nsvc->remote_end_is_sgsn) |
| 2169 | continue; |
| 2170 | |
| 2171 | /* Note that the following does not start the full |
| 2172 | * procedures including timer based retransmissions. */ |
Harald Welte | db2a2d5 | 2011-02-06 16:33:29 +0100 | [diff] [blame] | 2173 | switch (signal) { |
| 2174 | case S_NS_RESET: |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 2175 | gprs_ns_tx_reset(next_nsvc, nssd->cause); |
Harald Welte | db2a2d5 | 2011-02-06 16:33:29 +0100 | [diff] [blame] | 2176 | break; |
| 2177 | case S_NS_BLOCK: |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 2178 | gprs_ns_tx_block(next_nsvc, nssd->cause); |
Harald Welte | db2a2d5 | 2011-02-06 16:33:29 +0100 | [diff] [blame] | 2179 | break; |
| 2180 | case S_NS_UNBLOCK: |
Jacob Erlbeck | e48c347 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 2181 | gprs_ns_tx_unblock(next_nsvc); |
Harald Welte | db2a2d5 | 2011-02-06 16:33:29 +0100 | [diff] [blame] | 2182 | break; |
| 2183 | } |
Harald Welte | 5bb0d36 | 2010-05-11 06:34:24 +0200 | [diff] [blame] | 2184 | } |
| 2185 | } |
| 2186 | return 0; |
| 2187 | } |
| 2188 | |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 2189 | void gbprox_reset(struct gbproxy_config *cfg) |
Jacob Erlbeck | 67f03bd | 2013-10-24 12:48:55 +0200 | [diff] [blame] | 2190 | { |
Holger Hans Peter Freyther | d64bf22 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 2191 | struct gbproxy_peer *peer, *tmp; |
Jacob Erlbeck | 67f03bd | 2013-10-24 12:48:55 +0200 | [diff] [blame] | 2192 | |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 2193 | llist_for_each_entry_safe(peer, tmp, &cfg->bts_peers, list) |
Holger Hans Peter Freyther | 60fa5b9 | 2014-08-04 17:10:08 +0200 | [diff] [blame] | 2194 | gbproxy_peer_free(peer); |
Jacob Erlbeck | 67f03bd | 2013-10-24 12:48:55 +0200 | [diff] [blame] | 2195 | |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 2196 | rate_ctr_group_free(cfg->ctrg); |
| 2197 | gbproxy_init_config(cfg); |
Jacob Erlbeck | 67f03bd | 2013-10-24 12:48:55 +0200 | [diff] [blame] | 2198 | } |
| 2199 | |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 2200 | int gbprox_cleanup_peers(struct gbproxy_config *cfg, uint16_t nsei, uint16_t bvci) |
Jacob Erlbeck | 7fee972 | 2013-10-24 12:48:23 +0200 | [diff] [blame] | 2201 | { |
| 2202 | int counter = 0; |
Holger Hans Peter Freyther | d64bf22 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 2203 | struct gbproxy_peer *peer, *tmp; |
Jacob Erlbeck | 7fee972 | 2013-10-24 12:48:23 +0200 | [diff] [blame] | 2204 | |
Holger Hans Peter Freyther | 7d9c1df | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 2205 | llist_for_each_entry_safe(peer, tmp, &cfg->bts_peers, list) { |
Jacob Erlbeck | 7fee972 | 2013-10-24 12:48:23 +0200 | [diff] [blame] | 2206 | if (peer->nsei != nsei) |
| 2207 | continue; |
| 2208 | if (bvci && peer->bvci != bvci) |
| 2209 | continue; |
| 2210 | |
Holger Hans Peter Freyther | 60fa5b9 | 2014-08-04 17:10:08 +0200 | [diff] [blame] | 2211 | gbproxy_peer_free(peer); |
Jacob Erlbeck | 7fee972 | 2013-10-24 12:48:23 +0200 | [diff] [blame] | 2212 | counter += 1; |
| 2213 | } |
| 2214 | |
| 2215 | return counter; |
| 2216 | } |
| 2217 | |
Holger Hans Peter Freyther | 5eaf1a2 | 2014-08-04 11:10:09 +0200 | [diff] [blame] | 2218 | int gbproxy_init_config(struct gbproxy_config *cfg) |
Jacob Erlbeck | 7fee972 | 2013-10-24 12:48:23 +0200 | [diff] [blame] | 2219 | { |
Holger Hans Peter Freyther | 5eaf1a2 | 2014-08-04 11:10:09 +0200 | [diff] [blame] | 2220 | INIT_LLIST_HEAD(&cfg->bts_peers); |
Holger Hans Peter Freyther | 98e753f | 2014-08-04 11:19:56 +0200 | [diff] [blame] | 2221 | cfg->ctrg = rate_ctr_group_alloc(tall_bsc_ctx, &global_ctrg_desc, 0); |
Holger Hans Peter Freyther | 5eaf1a2 | 2014-08-04 11:10:09 +0200 | [diff] [blame] | 2222 | return 0; |
Jacob Erlbeck | 7fee972 | 2013-10-24 12:48:23 +0200 | [diff] [blame] | 2223 | } |