Harald Welte | 9f75c35 | 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 | 90267a9 | 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 | 9f75c35 | 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 | 9af6ddf | 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 | 9f75c35 | 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 | 9af6ddf | 2011-01-01 15:25:50 +0100 | [diff] [blame] | 16 | * GNU Affero General Public License for more details. |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 17 | * |
Harald Welte | 9af6ddf | 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 | 9f75c35 | 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 | 7fc9822 | 2010-05-11 10:15:42 +0200 | [diff] [blame] | 31 | #include <arpa/inet.h> |
Jacob Erlbeck | 7c101d9 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 32 | #include <time.h> |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 33 | |
Pablo Neira Ayuso | 136f453 | 2011-03-22 16:47:59 +0100 | [diff] [blame] | 34 | #include <osmocom/core/talloc.h> |
| 35 | #include <osmocom/core/select.h> |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 36 | #include <osmocom/core/rate_ctr.h> |
| 37 | |
Harald Welte | ea34a4e | 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 | 7c101d9 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 41 | #include <osmocom/gsm/gsm_utils.h> |
| 42 | |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 43 | #include <openbsc/signal.h> |
| 44 | #include <openbsc/debug.h> |
Harald Welte | 672f5c4 | 2010-05-03 18:54:58 +0200 | [diff] [blame] | 45 | #include <openbsc/gb_proxy.h> |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 46 | |
Jacob Erlbeck | 67a4445 | 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 | 7127b02 | 2014-08-04 11:52:52 +0200 | [diff] [blame^] | 50 | #include <openbsc/gprs_utils.h> |
Jacob Erlbeck | 67a4445 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 51 | |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 52 | enum gbprox_global_ctr { |
| 53 | GBPROX_GLOB_CTR_INV_BVCI, |
Jacob Erlbeck | 8f50359 | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 54 | GBPROX_GLOB_CTR_INV_LAI, |
| 55 | GBPROX_GLOB_CTR_INV_RAI, |
Jacob Erlbeck | bc55574 | 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 | 006c038 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 64 | GBPROX_GLOB_CTR_PATCH_PEER_ERR, |
Jacob Erlbeck | bc55574 | 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 | 8f50359 | 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 | bc55574 | 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 | 006c038 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 79 | { "mod-peer-err", "Patch error: no peer " }, |
Jacob Erlbeck | bc55574 | 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 | bc55574 | 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 | 006c038 | 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 | 25049b9 | 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 | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 103 | }; |
| 104 | |
| 105 | static const struct rate_ctr_desc peer_ctr_description[] = { |
Jacob Erlbeck | 006c038 | 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 | 25049b9 | 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 | bc55574 | 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 | |
Jacob Erlbeck | 7c101d9 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 128 | struct { |
| 129 | int check_imsi; |
| 130 | regex_t imsi_re_comp; |
| 131 | } gbprox_global_patch_state = {0,}; |
| 132 | |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 133 | |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 134 | static void gbprox_delete_tllis(struct gbproxy_peer *peer); |
Jacob Erlbeck | 7c101d9 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 135 | |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 136 | /* Find the gbprox_peer by its BVCI */ |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 137 | static struct gbproxy_peer *peer_by_bvci(uint16_t bvci) |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 138 | { |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 139 | struct gbproxy_peer *peer; |
Holger Hans Peter Freyther | 18739ea | 2014-08-04 11:10:09 +0200 | [diff] [blame] | 140 | llist_for_each_entry(peer, &gbcfg.bts_peers, list) { |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 141 | if (peer->bvci == bvci) |
| 142 | return peer; |
| 143 | } |
| 144 | return NULL; |
| 145 | } |
| 146 | |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 147 | /* Find the gbprox_peer by its NSEI */ |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 148 | struct gbproxy_peer *gbprox_peer_by_nsei(uint16_t nsei) |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 149 | { |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 150 | struct gbproxy_peer *peer; |
Holger Hans Peter Freyther | 18739ea | 2014-08-04 11:10:09 +0200 | [diff] [blame] | 151 | llist_for_each_entry(peer, &gbcfg.bts_peers, list) { |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 152 | if (peer->nsei == nsei) |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 153 | return peer; |
| 154 | } |
| 155 | return NULL; |
| 156 | } |
| 157 | |
Jacob Erlbeck | 8f50359 | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 158 | /* look-up a peer by its Routeing Area Identification (RAI) */ |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 159 | static struct gbproxy_peer *peer_by_rai(const uint8_t *ra) |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 160 | { |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 161 | struct gbproxy_peer *peer; |
Holger Hans Peter Freyther | 18739ea | 2014-08-04 11:10:09 +0200 | [diff] [blame] | 162 | llist_for_each_entry(peer, &gbcfg.bts_peers, list) { |
Harald Welte | 1174c08 | 2010-05-12 00:07:29 +0200 | [diff] [blame] | 163 | if (!memcmp(peer->ra, ra, 6)) |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 164 | return peer; |
| 165 | } |
| 166 | return NULL; |
| 167 | } |
| 168 | |
Jacob Erlbeck | 8f50359 | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 169 | /* look-up a peer by its Location Area Identification (LAI) */ |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 170 | static struct gbproxy_peer *peer_by_lai(const uint8_t *la) |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 171 | { |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 172 | struct gbproxy_peer *peer; |
Holger Hans Peter Freyther | 18739ea | 2014-08-04 11:10:09 +0200 | [diff] [blame] | 173 | llist_for_each_entry(peer, &gbcfg.bts_peers, list) { |
Harald Welte | 1174c08 | 2010-05-12 00:07:29 +0200 | [diff] [blame] | 174 | if (!memcmp(peer->ra, la, 5)) |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 175 | return peer; |
| 176 | } |
| 177 | return NULL; |
| 178 | } |
| 179 | |
Jacob Erlbeck | 006c038 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 180 | /* look-up a peer by its Location Area Code (LAC) */ |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 181 | static struct gbproxy_peer *peer_by_lac(const uint8_t *la) |
Jacob Erlbeck | 006c038 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 182 | { |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 183 | struct gbproxy_peer *peer; |
Holger Hans Peter Freyther | 18739ea | 2014-08-04 11:10:09 +0200 | [diff] [blame] | 184 | llist_for_each_entry(peer, &gbcfg.bts_peers, list) { |
Jacob Erlbeck | 006c038 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 185 | if (!memcmp(peer->ra + 3, la + 3, 2)) |
| 186 | return peer; |
| 187 | } |
| 188 | return NULL; |
| 189 | } |
| 190 | |
| 191 | |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 192 | static int check_peer_nsei(struct gbproxy_peer *peer, uint16_t nsei) |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 193 | { |
| 194 | if (peer->nsei != nsei) { |
| 195 | LOGP(DGPRS, LOGL_NOTICE, "Peer entry doesn't match current NSEI " |
| 196 | "BVCI=%u via NSEI=%u (expected NSEI=%u)\n", |
| 197 | peer->bvci, nsei, peer->nsei); |
| 198 | rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_INV_NSEI]); |
Jacob Erlbeck | 64cb924 | 2013-10-24 12:48:56 +0200 | [diff] [blame] | 199 | return 0; |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 200 | } |
| 201 | |
Jacob Erlbeck | 64cb924 | 2013-10-24 12:48:56 +0200 | [diff] [blame] | 202 | return 1; |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 203 | } |
| 204 | |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 205 | static struct gbproxy_peer *peer_alloc(uint16_t bvci) |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 206 | { |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 207 | struct gbproxy_peer *peer; |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 208 | |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 209 | peer = talloc_zero(tall_bsc_ctx, struct gbproxy_peer); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 210 | if (!peer) |
| 211 | return NULL; |
| 212 | |
| 213 | peer->bvci = bvci; |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 214 | peer->ctrg = rate_ctr_group_alloc(peer, &peer_ctrg_desc, bvci); |
| 215 | |
Holger Hans Peter Freyther | 18739ea | 2014-08-04 11:10:09 +0200 | [diff] [blame] | 216 | llist_add(&peer->list, &gbcfg.bts_peers); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 217 | |
Jacob Erlbeck | 7c101d9 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 218 | INIT_LLIST_HEAD(&peer->patch_state.enabled_tllis); |
| 219 | |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 220 | return peer; |
| 221 | } |
| 222 | |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 223 | static void peer_free(struct gbproxy_peer *peer) |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 224 | { |
Jacob Erlbeck | 02ca778 | 2013-10-23 11:24:16 +0200 | [diff] [blame] | 225 | rate_ctr_group_free(peer->ctrg); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 226 | llist_del(&peer->list); |
Jacob Erlbeck | 7c101d9 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 227 | |
| 228 | gbprox_delete_tllis(peer); |
| 229 | |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 230 | talloc_free(peer); |
| 231 | } |
| 232 | |
Harald Welte | 69619e3 | 2010-05-03 19:05:10 +0200 | [diff] [blame] | 233 | /* strip off the NS header */ |
| 234 | static void strip_ns_hdr(struct msgb *msg) |
| 235 | { |
| 236 | int strip_len = msgb_bssgph(msg) - msg->data; |
| 237 | msgb_pull(msg, strip_len); |
| 238 | } |
| 239 | |
Jacob Erlbeck | b138106 | 2014-07-01 12:41:13 +0200 | [diff] [blame] | 240 | /* TODO: Move shift functions to libosmocore */ |
| 241 | |
| 242 | int v_fixed_shift(uint8_t **data, size_t *data_len, |
| 243 | size_t len, uint8_t **value) |
| 244 | { |
| 245 | if (len > *data_len) |
| 246 | goto fail; |
| 247 | |
| 248 | if (value) |
| 249 | *value = *data; |
| 250 | |
| 251 | *data += len; |
| 252 | *data_len -= len; |
| 253 | |
| 254 | return len; |
| 255 | |
| 256 | fail: |
| 257 | *data += *data_len; |
| 258 | *data_len = 0; |
| 259 | return -1; |
| 260 | } |
| 261 | |
| 262 | int tv_fixed_match(uint8_t **data, size_t *data_len, |
| 263 | uint8_t tag, size_t len, |
| 264 | uint8_t **value) |
| 265 | { |
| 266 | size_t ie_len; |
| 267 | |
| 268 | if (*data_len == 0) |
| 269 | goto fail; |
| 270 | |
| 271 | if ((*data)[0] != tag) |
| 272 | return 0; |
| 273 | |
| 274 | if (len > *data_len - 1) |
| 275 | goto fail; |
| 276 | |
| 277 | if (value) |
| 278 | *value = *data + 1; |
| 279 | |
| 280 | ie_len = len + 1; |
| 281 | *data += ie_len; |
| 282 | *data_len -= ie_len; |
| 283 | |
| 284 | return ie_len; |
| 285 | |
| 286 | fail: |
| 287 | *data += *data_len; |
| 288 | *data_len = 0; |
| 289 | return -1; |
| 290 | } |
| 291 | |
| 292 | int tlv_match(uint8_t **data, size_t *data_len, |
| 293 | uint8_t tag, uint8_t **value, size_t *value_len) |
| 294 | { |
| 295 | size_t len; |
| 296 | size_t ie_len; |
| 297 | |
| 298 | if (*data_len < 2) |
| 299 | goto fail; |
| 300 | |
| 301 | if ((*data)[0] != tag) |
| 302 | return 0; |
| 303 | |
| 304 | len = (*data)[1]; |
| 305 | if (len > *data_len - 2) |
| 306 | goto fail; |
| 307 | |
| 308 | if (value) |
| 309 | *value = *data + 2; |
| 310 | if (value_len) |
| 311 | *value_len = len; |
| 312 | |
| 313 | ie_len = len + 2; |
| 314 | |
| 315 | *data += ie_len; |
| 316 | *data_len -= ie_len; |
| 317 | |
| 318 | return ie_len; |
| 319 | |
| 320 | fail: |
| 321 | *data += *data_len; |
| 322 | *data_len = 0; |
| 323 | return -1; |
| 324 | } |
| 325 | |
| 326 | int lv_shift(uint8_t **data, size_t *data_len, |
| 327 | uint8_t **value, size_t *value_len) |
| 328 | { |
| 329 | size_t len; |
| 330 | size_t ie_len; |
| 331 | |
| 332 | if (*data_len < 1) |
| 333 | goto fail; |
| 334 | |
| 335 | len = (*data)[0]; |
| 336 | if (len > *data_len - 1) |
| 337 | goto fail; |
| 338 | |
| 339 | if (value) |
| 340 | *value = *data + 1; |
| 341 | if (value_len) |
| 342 | *value_len = len; |
| 343 | |
| 344 | ie_len = len + 1; |
| 345 | *data += ie_len; |
| 346 | *data_len -= ie_len; |
| 347 | |
| 348 | return ie_len; |
| 349 | |
| 350 | fail: |
| 351 | *data += *data_len; |
| 352 | *data_len = 0; |
| 353 | return -1; |
| 354 | } |
| 355 | |
Jacob Erlbeck | 2e2650f | 2014-06-27 18:10:53 +0200 | [diff] [blame] | 356 | static int parse_mi_tmsi(uint8_t *value, size_t value_len, uint32_t *tmsi) |
| 357 | { |
| 358 | uint32_t tmsi_be; |
| 359 | |
| 360 | if (value_len != GSM48_TMSI_LEN) |
| 361 | return 0; |
| 362 | |
| 363 | if ((value[0] & 0x0f) != GSM_MI_TYPE_TMSI) |
| 364 | return 0; |
| 365 | |
| 366 | memcpy(&tmsi_be, value + 1, sizeof(tmsi_be)); |
| 367 | |
| 368 | *tmsi = ntohl(tmsi_be); |
| 369 | |
| 370 | return 1; |
| 371 | } |
| 372 | |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 373 | struct gbproxy_parse_context { |
Jacob Erlbeck | 35cc03f | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 374 | /* Pointer to protocol specific parts */ |
| 375 | struct gsm48_hdr *g48_hdr; |
| 376 | struct gprs_llc_hdr_parsed *llc_hdr_parsed; |
| 377 | struct tlv_parsed *bssgp_tp; |
| 378 | struct bssgp_ud_hdr *bud_hdr; |
| 379 | |
| 380 | /* Extracted information */ |
| 381 | int to_bss; |
| 382 | uint32_t tlli; |
| 383 | const uint8_t *imsi; |
| 384 | size_t imsi_len; |
| 385 | uint32_t new_ptmsi; |
| 386 | }; |
| 387 | |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 388 | static struct gbproxy_tlli_info *gbprox_find_tlli(struct gbproxy_peer *peer, |
Jacob Erlbeck | 7c101d9 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 389 | uint32_t tlli) |
| 390 | { |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 391 | struct gbproxy_tlli_info *tlli_info; |
| 392 | struct gbproxy_patch_state *state = &peer->patch_state; |
Jacob Erlbeck | 7c101d9 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 393 | |
| 394 | llist_for_each_entry(tlli_info, &state->enabled_tllis, list) |
| 395 | if (tlli_info->tlli == tlli) |
| 396 | return tlli_info; |
| 397 | |
| 398 | return NULL; |
| 399 | } |
| 400 | |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 401 | static struct gbproxy_tlli_info *gbprox_find_tlli_by_mi( |
| 402 | struct gbproxy_peer *peer, |
Jacob Erlbeck | 7c101d9 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 403 | const uint8_t *mi_data, |
| 404 | size_t mi_data_len) |
| 405 | { |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 406 | struct gbproxy_tlli_info *tlli_info; |
| 407 | struct gbproxy_patch_state *state = &peer->patch_state; |
Jacob Erlbeck | 7c101d9 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 408 | |
| 409 | llist_for_each_entry(tlli_info, &state->enabled_tllis, list) { |
| 410 | if (tlli_info->mi_data_len != mi_data_len) |
| 411 | continue; |
| 412 | if (memcmp(tlli_info->mi_data, mi_data, mi_data_len) != 0) |
| 413 | continue; |
| 414 | |
| 415 | return tlli_info; |
| 416 | } |
| 417 | |
| 418 | return NULL; |
| 419 | } |
| 420 | |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 421 | void gbprox_delete_tlli(struct gbproxy_peer *peer, |
| 422 | struct gbproxy_tlli_info *tlli_info) |
Jacob Erlbeck | 7c101d9 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 423 | { |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 424 | struct gbproxy_patch_state *state = &peer->patch_state; |
Jacob Erlbeck | 7c101d9 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 425 | |
| 426 | llist_del(&tlli_info->list); |
| 427 | talloc_free(tlli_info); |
| 428 | state->enabled_tllis_count -= 1; |
| 429 | } |
| 430 | |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 431 | static void gbprox_delete_tllis(struct gbproxy_peer *peer) |
Jacob Erlbeck | 7c101d9 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 432 | { |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 433 | struct gbproxy_tlli_info *tlli_info, *nxt; |
| 434 | struct gbproxy_patch_state *state = &peer->patch_state; |
Jacob Erlbeck | 7c101d9 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 435 | |
| 436 | llist_for_each_entry_safe(tlli_info, nxt, &state->enabled_tllis, list) { |
| 437 | llist_del(&tlli_info->list); |
| 438 | talloc_free(tlli_info); |
| 439 | } |
Jacob Erlbeck | 040b401 | 2014-06-27 12:20:44 +0200 | [diff] [blame] | 440 | state->enabled_tllis_count = 0; |
Jacob Erlbeck | 7c101d9 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 441 | |
| 442 | OSMO_ASSERT(llist_empty(&state->enabled_tllis)); |
| 443 | } |
| 444 | |
| 445 | int gbprox_set_patch_filter(const char *filter, const char **err_msg) |
| 446 | { |
| 447 | static char err_buf[300]; |
| 448 | int rc; |
| 449 | |
| 450 | if (gbprox_global_patch_state.check_imsi) { |
| 451 | regfree(&gbprox_global_patch_state.imsi_re_comp); |
| 452 | gbprox_global_patch_state.check_imsi = 0; |
| 453 | } |
| 454 | |
| 455 | if (!filter) |
| 456 | return 0; |
| 457 | |
| 458 | rc = regcomp(&gbprox_global_patch_state.imsi_re_comp, filter, |
| 459 | REG_EXTENDED | REG_NOSUB | REG_ICASE); |
| 460 | |
| 461 | if (rc == 0) { |
| 462 | gbprox_global_patch_state.check_imsi = 1; |
| 463 | return 0; |
| 464 | } |
| 465 | |
| 466 | if (err_msg) { |
| 467 | regerror(rc, &gbprox_global_patch_state.imsi_re_comp, |
| 468 | err_buf, sizeof(err_buf)); |
| 469 | *err_msg = err_buf; |
| 470 | } |
| 471 | |
| 472 | return -1; |
| 473 | } |
| 474 | |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 475 | static int gbprox_check_imsi(struct gbproxy_peer *peer, |
Jacob Erlbeck | 7c101d9 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 476 | const uint8_t *imsi, size_t imsi_len) |
| 477 | { |
| 478 | char mi_buf[200]; |
| 479 | int rc; |
| 480 | |
| 481 | if (!gbprox_global_patch_state.check_imsi) |
| 482 | return 1; |
| 483 | |
| 484 | rc = gsm48_mi_to_string(mi_buf, sizeof(mi_buf), imsi, imsi_len); |
| 485 | if (rc < 1) { |
| 486 | LOGP(DGPRS, LOGL_NOTICE, "Invalid IMSI %s\n", |
| 487 | osmo_hexdump(imsi, imsi_len)); |
| 488 | return -1; |
| 489 | } |
| 490 | |
| 491 | LOGP(DGPRS, LOGL_DEBUG, "Checking IMSI '%s' (%d)\n", mi_buf, rc); |
| 492 | |
| 493 | rc = regexec(&gbprox_global_patch_state.imsi_re_comp, mi_buf, 0, NULL, 0); |
| 494 | if (rc == REG_NOMATCH) { |
| 495 | LOGP(DGPRS, LOGL_INFO, |
| 496 | "IMSI '%s' doesn't match pattern '%s'\n", |
| 497 | mi_buf, gbcfg.match_re); |
| 498 | return 0; |
| 499 | } |
| 500 | |
| 501 | return 1; |
| 502 | } |
| 503 | |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 504 | int gbprox_remove_stale_tllis(struct gbproxy_peer *peer, time_t now) |
Jacob Erlbeck | 7c101d9 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 505 | { |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 506 | struct gbproxy_patch_state *state = &peer->patch_state; |
| 507 | struct gbproxy_tlli_info *tlli_info = NULL, *nxt; |
Jacob Erlbeck | 7c101d9 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 508 | int count = 0; |
| 509 | int deleted_count = 0; |
| 510 | |
| 511 | llist_for_each_entry_safe(tlli_info, nxt, &state->enabled_tllis, list) { |
| 512 | int is_stale = 0; |
| 513 | time_t age = now - tlli_info->timestamp; |
| 514 | |
| 515 | count += 1; |
| 516 | |
| 517 | if (gbcfg.tlli_max_len > 0) |
| 518 | is_stale = is_stale || count > gbcfg.tlli_max_len; |
| 519 | |
| 520 | if (gbcfg.tlli_max_age > 0) |
| 521 | is_stale = is_stale || age > gbcfg.tlli_max_age; |
| 522 | |
| 523 | if (!is_stale) |
| 524 | continue; |
| 525 | |
| 526 | LOGP(DGPRS, LOGL_INFO, |
| 527 | "Removing TLLI %08x from list (stale)\n", |
| 528 | tlli_info->tlli); |
| 529 | |
| 530 | gbprox_delete_tlli(peer, tlli_info); |
| 531 | tlli_info = NULL; |
| 532 | |
| 533 | deleted_count += 1; |
| 534 | } |
| 535 | |
| 536 | return deleted_count; |
| 537 | } |
| 538 | |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 539 | static void gbprox_register_tlli(struct gbproxy_peer *peer, uint32_t tlli, |
Jacob Erlbeck | 7c101d9 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 540 | const uint8_t *imsi, size_t imsi_len) |
| 541 | { |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 542 | struct gbproxy_patch_state *state = &peer->patch_state; |
| 543 | struct gbproxy_tlli_info *tlli_info; |
Jacob Erlbeck | 7c101d9 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 544 | int enable_patching; |
| 545 | time_t now = 0; |
| 546 | |
| 547 | if (gprs_tlli_type(tlli) != TLLI_LOCAL) |
| 548 | return; |
| 549 | |
| 550 | if (!imsi || (imsi[0] & GSM_MI_TYPE_MASK) != GSM_MI_TYPE_IMSI) |
| 551 | return; |
| 552 | |
| 553 | if (!gbprox_global_patch_state.check_imsi) |
| 554 | return; |
| 555 | |
| 556 | tlli_info = gbprox_find_tlli(peer, tlli); |
| 557 | |
| 558 | /* Check, whether the IMSI matches */ |
| 559 | enable_patching = gbprox_check_imsi(peer, imsi, imsi_len); |
| 560 | |
| 561 | if (enable_patching < 0) |
| 562 | return; |
| 563 | |
| 564 | if (!tlli_info) { |
| 565 | tlli_info = gbprox_find_tlli_by_mi(peer, imsi, imsi_len); |
| 566 | |
| 567 | if (tlli_info) { |
| 568 | /* TLLI has changed somehow, adjust it */ |
| 569 | LOGP(DGPRS, LOGL_INFO, |
| 570 | "The TLLI has changed from %08x to %08x\n", |
| 571 | tlli_info->tlli, tlli); |
| 572 | tlli_info->tlli = tlli; |
| 573 | } |
| 574 | } |
| 575 | |
| 576 | if (!tlli_info) { |
| 577 | if (!enable_patching) |
| 578 | return; |
| 579 | |
| 580 | LOGP(DGPRS, LOGL_INFO, "Adding TLLI %08x to list\n", tlli); |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 581 | tlli_info = talloc_zero(peer, struct gbproxy_tlli_info); |
Jacob Erlbeck | 7c101d9 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 582 | tlli_info->tlli = tlli; |
| 583 | } else { |
| 584 | llist_del(&tlli_info->list); |
| 585 | OSMO_ASSERT(state->enabled_tllis_count > 0); |
| 586 | state->enabled_tllis_count -= 1; |
| 587 | } |
| 588 | |
| 589 | OSMO_ASSERT(tlli_info != NULL); |
| 590 | |
| 591 | if (enable_patching) { |
| 592 | now = time(NULL); |
| 593 | |
| 594 | tlli_info->timestamp = now; |
| 595 | llist_add(&tlli_info->list, &state->enabled_tllis); |
| 596 | state->enabled_tllis_count += 1; |
| 597 | |
Holger Hans Peter Freyther | d4d36f2 | 2014-08-04 11:14:54 +0200 | [diff] [blame] | 598 | gbprox_remove_stale_tllis(peer, now); |
Jacob Erlbeck | 7c101d9 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 599 | |
| 600 | if (tlli_info != llist_entry(state->enabled_tllis.next, |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 601 | struct gbproxy_tlli_info, list)) { |
Jacob Erlbeck | 7c101d9 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 602 | LOGP(DGPRS, LOGL_ERROR, |
| 603 | "Unexpectedly removed new TLLI entry as stale, " |
| 604 | "TLLI %08x\n", tlli); |
| 605 | tlli_info = NULL; |
| 606 | } |
| 607 | } else { |
| 608 | LOGP(DGPRS, LOGL_INFO, |
| 609 | "Removing TLLI %08x from list (patching no longer enabled)\n", |
| 610 | tlli); |
| 611 | talloc_free(tlli_info); |
| 612 | tlli_info = NULL; |
| 613 | } |
| 614 | |
| 615 | if (tlli_info) { |
| 616 | tlli_info->mi_data_len = imsi_len; |
| 617 | tlli_info->mi_data = |
| 618 | talloc_realloc_size(tlli_info, tlli_info->mi_data, imsi_len); |
| 619 | OSMO_ASSERT(tlli_info->mi_data != NULL); |
| 620 | memcpy(tlli_info->mi_data, imsi, imsi_len); |
| 621 | } |
Jacob Erlbeck | 25049b9 | 2014-06-27 10:44:46 +0200 | [diff] [blame] | 622 | |
Jacob Erlbeck | 25049b9 | 2014-06-27 10:44:46 +0200 | [diff] [blame] | 623 | peer->ctrg->ctr[GBPROX_PEER_CTR_TLLI_CACHE_SIZE].current = |
| 624 | state->enabled_tllis_count; |
Jacob Erlbeck | 7c101d9 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 625 | } |
| 626 | |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 627 | static void gbprox_unregister_tlli(struct gbproxy_peer *peer, uint32_t tlli) |
Jacob Erlbeck | 7c101d9 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 628 | { |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 629 | struct gbproxy_tlli_info *tlli_info; |
| 630 | struct gbproxy_patch_state *state = &peer->patch_state; |
Jacob Erlbeck | 7c101d9 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 631 | |
| 632 | tlli_info = gbprox_find_tlli(peer, tlli); |
| 633 | if (tlli_info) { |
| 634 | LOGP(DGPRS, LOGL_INFO, |
| 635 | "Removing TLLI %08x from list\n", |
| 636 | tlli); |
| 637 | llist_del(&tlli_info->list); |
| 638 | talloc_free(tlli_info); |
Jacob Erlbeck | 040b401 | 2014-06-27 12:20:44 +0200 | [diff] [blame] | 639 | state->enabled_tllis_count -= 1; |
Jacob Erlbeck | 7c101d9 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 640 | } |
Jacob Erlbeck | 040b401 | 2014-06-27 12:20:44 +0200 | [diff] [blame] | 641 | |
| 642 | peer->ctrg->ctr[GBPROX_PEER_CTR_TLLI_CACHE_SIZE].current = |
| 643 | state->enabled_tllis_count; |
Jacob Erlbeck | 7c101d9 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 644 | } |
| 645 | |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 646 | static int gbprox_check_tlli(struct gbproxy_peer *peer, uint32_t tlli) |
Jacob Erlbeck | 7c101d9 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 647 | { |
| 648 | LOGP(DGPRS, LOGL_INFO, "Checking TLLI %08x, class: %d\n", |
| 649 | tlli, gprs_tlli_type(tlli)); |
| 650 | if (gprs_tlli_type(tlli) != TLLI_LOCAL) |
| 651 | return 0; |
| 652 | |
| 653 | return !gbprox_global_patch_state.check_imsi || |
| 654 | gbprox_find_tlli(peer, tlli) != NULL; |
| 655 | } |
| 656 | |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 657 | /* check whether patching is enabled at this level */ |
| 658 | static int patching_is_enabled(enum gbproxy_patch_mode need_at_least) |
| 659 | { |
| 660 | enum gbproxy_patch_mode patch_mode = gbcfg.patch_mode; |
| 661 | if (patch_mode == GBPROX_PATCH_DEFAULT) |
| 662 | patch_mode = GBPROX_PATCH_LLC; |
| 663 | |
| 664 | return need_at_least <= patch_mode; |
| 665 | } |
| 666 | |
| 667 | /* check whether patching is enabled at this level */ |
| 668 | static int patching_is_required(enum gbproxy_patch_mode need_at_least) |
| 669 | { |
| 670 | return need_at_least <= gbcfg.patch_mode; |
| 671 | } |
| 672 | |
Jacob Erlbeck | 67a4445 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 673 | /* patch RA identifier in place, update peer accordingly */ |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 674 | static void gbprox_patch_raid(uint8_t *raid_enc, struct gbproxy_peer *peer, |
Jacob Erlbeck | 67a4445 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 675 | int to_bss, const char *log_text) |
| 676 | { |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 677 | struct gbproxy_patch_state *state = &peer->patch_state; |
Jacob Erlbeck | 67a4445 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 678 | const int old_local_mcc = state->local_mcc; |
| 679 | const int old_local_mnc = state->local_mnc; |
| 680 | int old_mcc; |
| 681 | int old_mnc; |
| 682 | struct gprs_ra_id raid; |
| 683 | |
| 684 | gsm48_parse_ra(&raid, raid_enc); |
| 685 | |
| 686 | old_mcc = raid.mcc; |
| 687 | old_mnc = raid.mnc; |
| 688 | |
| 689 | if (!to_bss) { |
| 690 | /* BSS -> SGSN */ |
| 691 | /* save BSS side MCC/MNC */ |
| 692 | if (!gbcfg.core_mcc || raid.mcc == gbcfg.core_mcc) { |
| 693 | state->local_mcc = 0; |
| 694 | } else { |
| 695 | state->local_mcc = raid.mcc; |
| 696 | raid.mcc = gbcfg.core_mcc; |
| 697 | } |
| 698 | |
| 699 | if (!gbcfg.core_mnc || raid.mnc == gbcfg.core_mnc) { |
| 700 | state->local_mnc = 0; |
| 701 | } else { |
| 702 | state->local_mnc = raid.mnc; |
| 703 | raid.mnc = gbcfg.core_mnc; |
| 704 | } |
| 705 | } else { |
| 706 | /* SGSN -> BSS */ |
| 707 | if (state->local_mcc) |
| 708 | raid.mcc = state->local_mcc; |
| 709 | |
| 710 | if (state->local_mnc) |
| 711 | raid.mnc = state->local_mnc; |
| 712 | } |
| 713 | |
| 714 | if (old_local_mcc != state->local_mcc || |
| 715 | old_local_mnc != state->local_mnc) |
| 716 | LOGP(DGPRS, LOGL_NOTICE, |
| 717 | "Patching RAID %sactivated, msg: %s, " |
| 718 | "local: %d-%d, core: %d-%d, to %s\n", |
| 719 | state->local_mcc || state->local_mnc ? |
| 720 | "" : "de", |
| 721 | log_text, |
| 722 | state->local_mcc, state->local_mnc, |
| 723 | gbcfg.core_mcc, gbcfg.core_mnc, |
| 724 | to_bss ? "BSS" : "SGSN"); |
| 725 | |
| 726 | if (state->local_mcc || state->local_mnc) { |
Jacob Erlbeck | 006c038 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 727 | enum gbprox_peer_ctr counter = |
Jacob Erlbeck | 67a4445 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 728 | to_bss ? |
Jacob Erlbeck | 006c038 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 729 | GBPROX_PEER_CTR_RAID_PATCHED_SGSN : |
| 730 | GBPROX_PEER_CTR_RAID_PATCHED_BSS; |
Jacob Erlbeck | 67a4445 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 731 | |
| 732 | LOGP(DGPRS, LOGL_DEBUG, |
| 733 | "Patching %s to %s: " |
| 734 | "%d-%d-%d-%d -> %d-%d-%d-%d\n", |
| 735 | log_text, |
| 736 | to_bss ? "BSS" : "SGSN", |
| 737 | old_mcc, old_mnc, raid.lac, raid.rac, |
| 738 | raid.mcc, raid.mnc, raid.lac, raid.rac); |
| 739 | |
| 740 | gsm48_construct_ra(raid_enc, &raid); |
Jacob Erlbeck | 006c038 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 741 | rate_ctr_inc(&peer->ctrg->ctr[counter]); |
Jacob Erlbeck | 67a4445 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 742 | } |
| 743 | } |
| 744 | |
Jacob Erlbeck | 7368528 | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 745 | static void gbprox_patch_apn_ie(struct msgb *msg, |
| 746 | uint8_t *apn_ie, size_t apn_ie_len, |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 747 | struct gbproxy_peer *peer, |
Jacob Erlbeck | 7368528 | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 748 | size_t *new_apn_ie_len, const char *log_text) |
| 749 | { |
| 750 | struct apn_ie_hdr { |
| 751 | uint8_t iei; |
| 752 | uint8_t apn_len; |
| 753 | uint8_t apn[0]; |
| 754 | } *hdr = (void *)apn_ie; |
| 755 | |
| 756 | size_t apn_len = hdr->apn_len; |
| 757 | uint8_t *apn = hdr->apn; |
| 758 | |
| 759 | OSMO_ASSERT(apn_ie_len == apn_len + sizeof(struct apn_ie_hdr)); |
| 760 | OSMO_ASSERT(apn_ie_len > 2 && apn_ie_len <= 102); |
| 761 | |
| 762 | if (gbcfg.core_apn_size == 0) { |
| 763 | char str1[110]; |
| 764 | /* Remove the IE */ |
| 765 | LOGP(DGPRS, LOGL_DEBUG, |
| 766 | "Patching %s to SGSN: Removing APN '%s'\n", |
| 767 | log_text, |
Holger Hans Peter Freyther | 7127b02 | 2014-08-04 11:52:52 +0200 | [diff] [blame^] | 768 | gprs_apn_to_str(str1, apn, apn_len)); |
Jacob Erlbeck | 7368528 | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 769 | |
| 770 | *new_apn_ie_len = 0; |
Holger Hans Peter Freyther | 7127b02 | 2014-08-04 11:52:52 +0200 | [diff] [blame^] | 771 | gprs_msgb_resize_area(msg, apn_ie, apn_ie_len, 0); |
Jacob Erlbeck | 7368528 | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 772 | } else { |
| 773 | /* Resize the IE */ |
| 774 | char str1[110]; |
| 775 | char str2[110]; |
| 776 | |
| 777 | OSMO_ASSERT(gbcfg.core_apn_size <= 100); |
| 778 | |
| 779 | LOGP(DGPRS, LOGL_DEBUG, |
| 780 | "Patching %s to SGSN: " |
| 781 | "Replacing APN '%s' -> '%s'\n", |
| 782 | log_text, |
Holger Hans Peter Freyther | 7127b02 | 2014-08-04 11:52:52 +0200 | [diff] [blame^] | 783 | gprs_apn_to_str(str1, apn, apn_len), |
| 784 | gprs_apn_to_str(str2, gbcfg.core_apn, |
Jacob Erlbeck | 7368528 | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 785 | gbcfg.core_apn_size)); |
| 786 | |
| 787 | *new_apn_ie_len = gbcfg.core_apn_size + 2; |
Holger Hans Peter Freyther | 7127b02 | 2014-08-04 11:52:52 +0200 | [diff] [blame^] | 788 | gprs_msgb_resize_area(msg, apn, apn_len, gbcfg.core_apn_size); |
Jacob Erlbeck | 7368528 | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 789 | memcpy(apn, gbcfg.core_apn, gbcfg.core_apn_size); |
| 790 | hdr->apn_len = gbcfg.core_apn_size; |
| 791 | } |
| 792 | |
Jacob Erlbeck | 006c038 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 793 | rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_APN_PATCHED]); |
Jacob Erlbeck | 7368528 | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 794 | } |
| 795 | |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 796 | static int gbprox_patch_gmm_attach_req(struct msgb *msg, |
| 797 | uint8_t *data, size_t data_len, |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 798 | struct gbproxy_peer *peer, |
Jacob Erlbeck | 35cc03f | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 799 | int *len_change, |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 800 | struct gbproxy_parse_context *parse_ctx) |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 801 | { |
Jacob Erlbeck | aefaf92 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 802 | uint8_t *value; |
| 803 | size_t value_len; |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 804 | |
| 805 | /* Skip MS network capability */ |
Jacob Erlbeck | aefaf92 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 806 | if (lv_shift(&data, &data_len, NULL, &value_len) <= 0 || |
| 807 | value_len < 1 || value_len > 2) |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 808 | /* invalid */ |
Jacob Erlbeck | aefaf92 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 809 | return 0;; |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 810 | |
| 811 | /* Skip Attach type */ |
| 812 | /* Skip Ciphering key sequence number */ |
| 813 | /* Skip DRX parameter */ |
Jacob Erlbeck | aefaf92 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 814 | v_fixed_shift(&data, &data_len, 3, NULL); |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 815 | |
| 816 | /* Skip Mobile identity */ |
Jacob Erlbeck | aefaf92 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 817 | if (lv_shift(&data, &data_len, NULL, &value_len) <= 0 || |
| 818 | value_len < 5 || value_len > 8) |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 819 | /* invalid */ |
Jacob Erlbeck | aefaf92 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 820 | return 0;; |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 821 | |
Jacob Erlbeck | aefaf92 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 822 | if (v_fixed_shift(&data, &data_len, 6, &value) <= 0) |
| 823 | return 0; |
| 824 | |
Jacob Erlbeck | 35cc03f | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 825 | gbprox_patch_raid(value, peer, parse_ctx->to_bss, "LLC/ATTACH_REQ"); |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 826 | |
| 827 | return 1; |
| 828 | } |
| 829 | |
| 830 | static int gbprox_patch_gmm_attach_ack(struct msgb *msg, |
| 831 | uint8_t *data, size_t data_len, |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 832 | struct gbproxy_peer *peer, int *len_change, |
| 833 | struct gbproxy_parse_context *parse_ctx) |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 834 | { |
Jacob Erlbeck | aefaf92 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 835 | uint8_t *value; |
Jacob Erlbeck | 2e2650f | 2014-06-27 18:10:53 +0200 | [diff] [blame] | 836 | size_t value_len; |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 837 | |
| 838 | /* Skip Attach result */ |
| 839 | /* Skip Force to standby */ |
| 840 | /* Skip Periodic RA update timer */ |
| 841 | /* Skip Radio priority for SMS */ |
| 842 | /* Skip Spare half octet */ |
Jacob Erlbeck | aefaf92 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 843 | v_fixed_shift(&data, &data_len, 3, NULL); |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 844 | |
Jacob Erlbeck | aefaf92 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 845 | if (v_fixed_shift(&data, &data_len, 6, &value) <= 0) |
| 846 | return 0; |
| 847 | |
Jacob Erlbeck | 35cc03f | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 848 | gbprox_patch_raid(value, peer, parse_ctx->to_bss, "LLC/ATTACH_ACK"); |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 849 | |
Jacob Erlbeck | 2e2650f | 2014-06-27 18:10:53 +0200 | [diff] [blame] | 850 | /* Skip P-TMSI signature (P-TMSI signature, opt, TV, length 4) */ |
| 851 | tv_fixed_match(&data, &data_len, GSM48_IE_GMM_PTMSI_SIG, 3, NULL); |
| 852 | |
| 853 | /* Skip Negotiated READY timer value (GPRS timer, opt, TV, length 2) */ |
| 854 | tv_fixed_match(&data, &data_len, GSM48_IE_GMM_TIMER_READY, 1, NULL); |
| 855 | |
| 856 | /* Allocated P-TMSI (Mobile identity, opt, TLV, length 7) */ |
| 857 | if (tlv_match(&data, &data_len, GSM48_IE_GMM_ALLOC_PTMSI, |
| 858 | &value, &value_len) > 0) |
| 859 | parse_mi_tmsi(value, value_len, &parse_ctx->new_ptmsi); |
| 860 | |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 861 | return 1; |
| 862 | } |
| 863 | |
| 864 | static int gbprox_patch_gmm_ra_upd_req(struct msgb *msg, |
| 865 | uint8_t *data, size_t data_len, |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 866 | struct gbproxy_peer *peer, int *len_change, |
| 867 | struct gbproxy_parse_context *parse_ctx) |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 868 | { |
Jacob Erlbeck | aefaf92 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 869 | uint8_t *value; |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 870 | |
| 871 | /* Skip Update type */ |
| 872 | /* Skip GPRS ciphering key sequence number */ |
Jacob Erlbeck | aefaf92 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 873 | v_fixed_shift(&data, &data_len, 1, NULL); |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 874 | |
Jacob Erlbeck | aefaf92 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 875 | if (v_fixed_shift(&data, &data_len, 6, &value) <= 0) |
| 876 | return 0; |
| 877 | |
Jacob Erlbeck | 35cc03f | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 878 | gbprox_patch_raid(value, peer, parse_ctx->to_bss, "LLC/RA_UPD_REQ"); |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 879 | |
| 880 | return 1; |
| 881 | } |
| 882 | |
| 883 | static int gbprox_patch_gmm_ra_upd_ack(struct msgb *msg, |
| 884 | uint8_t *data, size_t data_len, |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 885 | struct gbproxy_peer *peer, int *len_change, |
| 886 | struct gbproxy_parse_context *parse_ctx) |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 887 | { |
Jacob Erlbeck | aefaf92 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 888 | uint8_t *value; |
Jacob Erlbeck | 2e2650f | 2014-06-27 18:10:53 +0200 | [diff] [blame] | 889 | size_t value_len; |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 890 | |
| 891 | /* Skip Force to standby */ |
| 892 | /* Skip Update result */ |
| 893 | /* Skip Periodic RA update timer */ |
Jacob Erlbeck | aefaf92 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 894 | v_fixed_shift(&data, &data_len, 2, NULL); |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 895 | |
Jacob Erlbeck | aefaf92 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 896 | if (v_fixed_shift(&data, &data_len, 6, &value) <= 0) |
| 897 | return 0; |
| 898 | |
Jacob Erlbeck | 35cc03f | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 899 | gbprox_patch_raid(value, peer, parse_ctx->to_bss, "LLC/RA_UPD_ACK"); |
Jacob Erlbeck | aefaf92 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 900 | |
Jacob Erlbeck | 2e2650f | 2014-06-27 18:10:53 +0200 | [diff] [blame] | 901 | /* Skip P-TMSI signature (P-TMSI signature, opt, TV, length 4) */ |
| 902 | tv_fixed_match(&data, &data_len, GSM48_IE_GMM_PTMSI_SIG, 3, NULL); |
| 903 | |
| 904 | /* Allocated P-TMSI (Mobile identity, opt, TLV, length 7) */ |
| 905 | if (tlv_match(&data, &data_len, GSM48_IE_GMM_ALLOC_PTMSI, |
| 906 | &value, &value_len) > 0) |
| 907 | parse_mi_tmsi(value, value_len, &parse_ctx->new_ptmsi); |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 908 | |
| 909 | return 1; |
| 910 | } |
| 911 | |
| 912 | static int gbprox_patch_gmm_ptmsi_reall_cmd(struct msgb *msg, |
| 913 | uint8_t *data, size_t data_len, |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 914 | struct gbproxy_peer *peer, |
Jacob Erlbeck | 35cc03f | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 915 | int *len_change, |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 916 | struct gbproxy_parse_context *parse_ctx) |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 917 | { |
Jacob Erlbeck | aefaf92 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 918 | uint8_t *value; |
| 919 | size_t value_len; |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 920 | |
Jacob Erlbeck | 2e2650f | 2014-06-27 18:10:53 +0200 | [diff] [blame] | 921 | LOGP(DLLC, LOGL_NOTICE, |
| 922 | "Got P-TMSI Reallocation Command which is not covered by unit tests yet.\n"); |
| 923 | |
| 924 | /* Allocated P-TMSI */ |
| 925 | if (lv_shift(&data, &data_len, &value, &value_len) > 0 && |
| 926 | parse_mi_tmsi(value, value_len, &parse_ctx->new_ptmsi) < 0) |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 927 | /* invalid */ |
| 928 | return 0; |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 929 | |
Jacob Erlbeck | aefaf92 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 930 | if (v_fixed_shift(&data, &data_len, 6, &value) <= 0) |
| 931 | return 0; |
| 932 | |
Jacob Erlbeck | 35cc03f | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 933 | gbprox_patch_raid(value, peer, parse_ctx->to_bss, "LLC/PTMSI_REALL_CMD"); |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 934 | |
| 935 | return 1; |
| 936 | } |
| 937 | |
Jacob Erlbeck | 7368528 | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 938 | static int gbprox_patch_gsm_act_pdp_req(struct msgb *msg, |
| 939 | uint8_t *data, size_t data_len, |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 940 | struct gbproxy_peer *peer, int *len_change, |
| 941 | struct gbproxy_parse_context *parse_ctx) |
Jacob Erlbeck | 7368528 | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 942 | { |
Jacob Erlbeck | aefaf92 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 943 | size_t new_len; |
| 944 | ssize_t old_len; |
| 945 | uint8_t *value; |
| 946 | size_t value_len; |
| 947 | int have_patched = 0; |
Jacob Erlbeck | 7368528 | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 948 | |
| 949 | /* Skip Requested NSAPI */ |
| 950 | /* Skip Requested LLC SAPI */ |
Jacob Erlbeck | aefaf92 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 951 | v_fixed_shift(&data, &data_len, 2, NULL); |
Jacob Erlbeck | 7368528 | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 952 | |
| 953 | /* Skip Requested QoS (support 04.08 and 24.008) */ |
Jacob Erlbeck | aefaf92 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 954 | if (lv_shift(&data, &data_len, NULL, &value_len) <= 0 || |
| 955 | value_len < 4 || value_len > 14) |
Jacob Erlbeck | 7368528 | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 956 | /* invalid */ |
Jacob Erlbeck | aefaf92 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 957 | return 0;; |
Jacob Erlbeck | 7368528 | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 958 | |
| 959 | /* Skip Requested PDP address */ |
Jacob Erlbeck | aefaf92 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 960 | if (lv_shift(&data, &data_len, NULL, &value_len) <= 0 || |
| 961 | value_len < 2 || value_len > 18) |
Jacob Erlbeck | 7368528 | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 962 | /* invalid */ |
| 963 | return 0; |
Jacob Erlbeck | 7368528 | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 964 | |
| 965 | /* Access point name */ |
Jacob Erlbeck | aefaf92 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 966 | old_len = tlv_match(&data, &data_len, |
| 967 | GSM48_IE_GSM_APN, &value, &value_len); |
Jacob Erlbeck | 7368528 | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 968 | |
Jacob Erlbeck | aefaf92 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 969 | if (old_len > 0 && value_len >=1 && value_len <= 100) { |
| 970 | gbprox_patch_apn_ie(msg, data - old_len, old_len, peer, |
| 971 | &new_len, "LLC/ACT_PDP_REQ"); |
| 972 | *len_change += (int)new_len - (int)old_len; |
| 973 | data += *len_change; |
Jacob Erlbeck | 7368528 | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 974 | |
Jacob Erlbeck | aefaf92 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 975 | have_patched = 1; |
| 976 | } |
Jacob Erlbeck | 7368528 | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 977 | |
Jacob Erlbeck | aefaf92 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 978 | return have_patched; |
Jacob Erlbeck | 7368528 | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 979 | } |
| 980 | |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 981 | struct gbproxy_peer *peer_by_bssgp_tlv(struct tlv_parsed *tp) |
Jacob Erlbeck | 006c038 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 982 | { |
| 983 | if (TLVP_PRESENT(tp, BSSGP_IE_BVCI)) { |
| 984 | uint16_t bvci; |
| 985 | |
| 986 | bvci = ntohs(tlvp_val16_unal(tp, BSSGP_IE_BVCI)); |
| 987 | if (bvci >= 2) |
| 988 | return peer_by_bvci(bvci); |
| 989 | } |
| 990 | |
| 991 | if (TLVP_PRESENT(tp, BSSGP_IE_ROUTEING_AREA)) { |
| 992 | uint8_t *rai = (uint8_t *)TLVP_VAL(tp, BSSGP_IE_ROUTEING_AREA); |
| 993 | /* Only compare LAC part, since MCC/MNC are possibly patched. |
| 994 | * Since the LAC of different BSS must be different when |
| 995 | * MCC/MNC are patched, collisions shouldn't happen. */ |
| 996 | return peer_by_lac(rai); |
| 997 | } |
| 998 | |
| 999 | if (TLVP_PRESENT(tp, BSSGP_IE_LOCATION_AREA)) { |
| 1000 | uint8_t *lai = (uint8_t *)TLVP_VAL(tp, BSSGP_IE_LOCATION_AREA); |
| 1001 | return peer_by_lac(lai); |
| 1002 | } |
| 1003 | |
| 1004 | return NULL; |
| 1005 | } |
| 1006 | |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1007 | static int gbprox_patch_dtap(struct msgb *msg, uint8_t *data, size_t data_len, |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 1008 | struct gbproxy_peer *peer, int *len_change, |
| 1009 | struct gbproxy_parse_context *parse_ctx) |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1010 | { |
| 1011 | struct gsm48_hdr *g48h; |
| 1012 | |
| 1013 | *len_change = 0; |
| 1014 | |
Jacob Erlbeck | aefaf92 | 2014-06-27 18:25:53 +0200 | [diff] [blame] | 1015 | if (v_fixed_shift(&data, &data_len, sizeof(*g48h), (uint8_t **)&g48h) <= 0) |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1016 | return 0; |
| 1017 | |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1018 | if ((g48h->proto_discr & 0x0f) != GSM48_PDISC_MM_GPRS && |
| 1019 | (g48h->proto_discr & 0x0f) != GSM48_PDISC_SM_GPRS) |
| 1020 | return 0; |
| 1021 | |
| 1022 | switch (g48h->msg_type) { |
| 1023 | case GSM48_MT_GMM_ATTACH_REQ: |
Jacob Erlbeck | 25049b9 | 2014-06-27 10:44:46 +0200 | [diff] [blame] | 1024 | rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_ATTACH_REQS]); |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1025 | return gbprox_patch_gmm_attach_req(msg, data, data_len, |
Jacob Erlbeck | 35cc03f | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 1026 | peer, len_change, parse_ctx); |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1027 | |
| 1028 | case GSM48_MT_GMM_ATTACH_ACK: |
| 1029 | if (!patching_is_enabled(GBPROX_PATCH_LLC_ATTACH)) |
| 1030 | break; |
| 1031 | return gbprox_patch_gmm_attach_ack(msg, data, data_len, |
Jacob Erlbeck | 35cc03f | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 1032 | peer, len_change, parse_ctx); |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1033 | |
Jacob Erlbeck | 25049b9 | 2014-06-27 10:44:46 +0200 | [diff] [blame] | 1034 | case GSM48_MT_GMM_ATTACH_REJ: |
| 1035 | rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_ATTACH_REJS]); |
| 1036 | break; |
| 1037 | |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1038 | case GSM48_MT_GMM_RA_UPD_REQ: |
| 1039 | if (!patching_is_enabled(GBPROX_PATCH_LLC_GMM)) |
| 1040 | break; |
| 1041 | return gbprox_patch_gmm_ra_upd_req(msg, data, data_len, |
Jacob Erlbeck | 35cc03f | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 1042 | peer, len_change, parse_ctx); |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1043 | |
| 1044 | case GSM48_MT_GMM_RA_UPD_ACK: |
| 1045 | if (!patching_is_enabled(GBPROX_PATCH_LLC_GMM)) |
| 1046 | break; |
| 1047 | return gbprox_patch_gmm_ra_upd_ack(msg, data, data_len, |
Jacob Erlbeck | 35cc03f | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 1048 | peer, len_change, parse_ctx); |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1049 | |
| 1050 | case GSM48_MT_GMM_PTMSI_REALL_CMD: |
| 1051 | if (!patching_is_enabled(GBPROX_PATCH_LLC_GMM)) |
| 1052 | break; |
| 1053 | return gbprox_patch_gmm_ptmsi_reall_cmd(msg, data, data_len, |
Jacob Erlbeck | 35cc03f | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 1054 | peer, len_change, |
| 1055 | parse_ctx); |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1056 | |
Jacob Erlbeck | 7368528 | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 1057 | case GSM48_MT_GSM_ACT_PDP_REQ: |
| 1058 | if (!patching_is_enabled(GBPROX_PATCH_LLC_GSM)) |
| 1059 | break; |
| 1060 | if (gbcfg.core_apn == NULL) |
| 1061 | break; |
Jacob Erlbeck | 35cc03f | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 1062 | if (!gbprox_check_tlli(peer, parse_ctx->tlli)) |
Jacob Erlbeck | 7c101d9 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 1063 | break; |
Jacob Erlbeck | 7368528 | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 1064 | return gbprox_patch_gsm_act_pdp_req(msg, data, data_len, |
Jacob Erlbeck | 35cc03f | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 1065 | peer, len_change, parse_ctx); |
Jacob Erlbeck | 7c101d9 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 1066 | |
| 1067 | case GSM48_MT_GMM_DETACH_ACK: |
| 1068 | case GSM48_MT_GMM_DETACH_REQ: |
Jacob Erlbeck | 35cc03f | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 1069 | gbprox_unregister_tlli(peer, parse_ctx->tlli); |
Jacob Erlbeck | 7c101d9 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 1070 | break; |
| 1071 | |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1072 | default: |
| 1073 | break; |
| 1074 | }; |
| 1075 | |
| 1076 | return 0; |
| 1077 | } |
| 1078 | |
| 1079 | static void gbprox_patch_llc(struct msgb *msg, uint8_t *llc, size_t llc_len, |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 1080 | struct gbproxy_peer *peer, int *len_change, |
| 1081 | struct gbproxy_parse_context *parse_ctx) |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1082 | { |
| 1083 | struct gprs_llc_hdr_parsed ghp = {0}; |
| 1084 | int rc; |
| 1085 | uint8_t *data; |
| 1086 | size_t data_len; |
| 1087 | int fcs; |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1088 | const char *err_info = NULL; |
| 1089 | int err_ctr = -1; |
Jacob Erlbeck | 35cc03f | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 1090 | uint32_t tlli = parse_ctx->tlli; |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1091 | |
| 1092 | /* parse LLC */ |
| 1093 | rc = gprs_llc_hdr_parse(&ghp, llc, llc_len); |
| 1094 | gprs_llc_hdr_dump(&ghp); |
| 1095 | if (rc != 0) { |
| 1096 | LOGP(DLLC, LOGL_NOTICE, "Error during LLC header parsing\n"); |
| 1097 | return; |
| 1098 | } |
| 1099 | |
| 1100 | fcs = gprs_llc_fcs(llc, ghp.crc_length); |
| 1101 | LOGP(DLLC, LOGL_DEBUG, "Got LLC message, CRC: %06x (computed %06x)\n", |
| 1102 | ghp.fcs, fcs); |
| 1103 | |
| 1104 | if (!ghp.data) |
| 1105 | return; |
| 1106 | |
| 1107 | if (ghp.sapi != GPRS_SAPI_GMM) |
| 1108 | return; |
| 1109 | |
Jacob Erlbeck | 35cc03f | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 1110 | if (gbcfg.core_apn && parse_ctx->to_bss && tlli && parse_ctx->imsi) |
Jacob Erlbeck | 7c101d9 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 1111 | gbprox_register_tlli(peer, tlli, |
Jacob Erlbeck | 35cc03f | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 1112 | parse_ctx->imsi, parse_ctx->imsi_len); |
Jacob Erlbeck | 7c101d9 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 1113 | |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1114 | if (ghp.cmd != GPRS_LLC_UI) |
| 1115 | return; |
| 1116 | |
| 1117 | if (ghp.is_encrypted) { |
| 1118 | if (patching_is_required(GBPROX_PATCH_LLC_ATTACH)) { |
| 1119 | /* Patching LLC messages has been requested explicitly, |
| 1120 | * but the message (including the type) is encrypted, |
| 1121 | * so we possibly fail to patch the LLC part of the |
| 1122 | * message. */ |
| 1123 | |
| 1124 | err_info = "GMM message is encrypted"; |
Jacob Erlbeck | 006c038 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 1125 | err_ctr = GBPROX_PEER_CTR_PATCH_CRYPT_ERR; |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1126 | goto patch_error; |
| 1127 | } |
| 1128 | |
| 1129 | return; |
| 1130 | } |
| 1131 | |
| 1132 | /* fix DTAP GMM/GSM */ |
| 1133 | data = ghp.data; |
| 1134 | data_len = ghp.data_len; |
| 1135 | |
Jacob Erlbeck | 35cc03f | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 1136 | parse_ctx->llc_hdr_parsed = &ghp; |
| 1137 | |
Jacob Erlbeck | 03551e5 | 2014-06-27 19:56:05 +0200 | [diff] [blame] | 1138 | rc = gbprox_patch_dtap(msg, data, data_len, peer, len_change, parse_ctx); |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1139 | |
Jacob Erlbeck | 2e2650f | 2014-06-27 18:10:53 +0200 | [diff] [blame] | 1140 | if (parse_ctx->new_ptmsi && |
| 1141 | (parse_ctx->new_ptmsi | 0xc000) != (tlli | 0xc000) && |
| 1142 | gbcfg.core_apn && parse_ctx->to_bss && parse_ctx->imsi) { |
| 1143 | /* A new TLLI (PTMSI) has been signaled in the message */ |
| 1144 | LOGP(DGPRS, LOGL_INFO, |
| 1145 | "Got new TLLI/PTMSI %08x (current is %08x)\n", |
| 1146 | parse_ctx->new_ptmsi, tlli); |
| 1147 | gbprox_register_tlli(peer, parse_ctx->new_ptmsi, |
| 1148 | parse_ctx->imsi, parse_ctx->imsi_len); |
| 1149 | } |
| 1150 | |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1151 | if (rc > 0) { |
Jacob Erlbeck | 03551e5 | 2014-06-27 19:56:05 +0200 | [diff] [blame] | 1152 | llc_len += *len_change; |
| 1153 | ghp.crc_length += *len_change; |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1154 | |
| 1155 | /* Fix FCS */ |
| 1156 | fcs = gprs_llc_fcs(llc, ghp.crc_length); |
| 1157 | LOGP(DLLC, LOGL_DEBUG, "Updated LLC message, CRC: %06x -> %06x\n", |
| 1158 | ghp.fcs, fcs); |
| 1159 | |
| 1160 | llc[llc_len - 3] = fcs & 0xff; |
| 1161 | llc[llc_len - 2] = (fcs >> 8) & 0xff; |
| 1162 | llc[llc_len - 1] = (fcs >> 16) & 0xff; |
| 1163 | } |
| 1164 | |
| 1165 | return; |
| 1166 | |
| 1167 | patch_error: |
| 1168 | OSMO_ASSERT(err_ctr >= 0); |
Jacob Erlbeck | 006c038 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 1169 | rate_ctr_inc(&peer->ctrg->ctr[err_ctr]); |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1170 | LOGP(DGPRS, LOGL_ERROR, |
| 1171 | "Failed to patch BSSGP/GMM message as requested: %s.\n", err_info); |
| 1172 | |
| 1173 | return; |
| 1174 | } |
| 1175 | |
Jacob Erlbeck | 67a4445 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 1176 | /* patch BSSGP message to use core_mcc/mnc on the SGSN side */ |
Jacob Erlbeck | 006c038 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 1177 | static void gbprox_patch_bssgp_message(struct msgb *msg, |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 1178 | struct gbproxy_peer *peer, int to_bss) |
Jacob Erlbeck | 67a4445 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 1179 | { |
| 1180 | struct bssgp_normal_hdr *bgph; |
Jacob Erlbeck | 7c101d9 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 1181 | struct bssgp_ud_hdr *budh = NULL; |
Jacob Erlbeck | 67a4445 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 1182 | struct tlv_parsed tp; |
| 1183 | uint8_t pdu_type; |
Jacob Erlbeck | 67a4445 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 1184 | uint8_t *data; |
| 1185 | size_t data_len; |
Jacob Erlbeck | 03551e5 | 2014-06-27 19:56:05 +0200 | [diff] [blame] | 1186 | const char *err_info = NULL; |
| 1187 | int err_ctr = -1; |
Jacob Erlbeck | 67a4445 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 1188 | |
Jacob Erlbeck | 7368528 | 2014-05-23 20:48:07 +0200 | [diff] [blame] | 1189 | if (!gbcfg.core_mcc && !gbcfg.core_mnc && !gbcfg.core_apn) |
Jacob Erlbeck | 67a4445 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 1190 | return; |
| 1191 | |
| 1192 | bgph = (struct bssgp_normal_hdr *) msgb_bssgph(msg); |
Jacob Erlbeck | 67a4445 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 1193 | pdu_type = bgph->pdu_type; |
| 1194 | |
Jacob Erlbeck | 67a4445 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 1195 | if (pdu_type == BSSGP_PDUT_UL_UNITDATA || |
| 1196 | pdu_type == BSSGP_PDUT_DL_UNITDATA) { |
Jacob Erlbeck | 7c101d9 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 1197 | budh = (struct bssgp_ud_hdr *) msgb_bssgph(msg); |
| 1198 | bgph = NULL; |
Jacob Erlbeck | 67a4445 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 1199 | data = budh->data; |
| 1200 | data_len = msgb_bssgp_len(msg) - sizeof(*budh); |
| 1201 | } else { |
| 1202 | data = bgph->data; |
| 1203 | data_len = msgb_bssgp_len(msg) - sizeof(*bgph); |
| 1204 | } |
| 1205 | |
| 1206 | bssgp_tlv_parse(&tp, data, data_len); |
| 1207 | |
Jacob Erlbeck | 006c038 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 1208 | if (!peer && msgb_bvci(msg) >= 2) |
| 1209 | peer = peer_by_bvci(msgb_bvci(msg)); |
| 1210 | |
| 1211 | if (!peer && !to_bss) |
Holger Hans Peter Freyther | 16f30b5 | 2014-08-04 11:24:25 +0200 | [diff] [blame] | 1212 | peer = gbprox_peer_by_nsei(msgb_nsei(msg)); |
Jacob Erlbeck | 006c038 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 1213 | |
| 1214 | if (!peer) |
| 1215 | peer = peer_by_bssgp_tlv(&tp); |
| 1216 | |
| 1217 | if (!peer) { |
| 1218 | LOGP(DLLC, LOGL_INFO, |
| 1219 | "NSEI=%d(%s) patching: didn't find peer for message, " |
| 1220 | "PDU %d\n", |
| 1221 | msgb_nsei(msg), to_bss ? "SGSN" : "BSS", pdu_type); |
| 1222 | /* Increment counter */ |
Holger Hans Peter Freyther | a7027a0 | 2014-08-04 11:19:56 +0200 | [diff] [blame] | 1223 | rate_ctr_inc(&gbcfg.ctrg->ctr[GBPROX_GLOB_CTR_PATCH_PEER_ERR]); |
Jacob Erlbeck | 006c038 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 1224 | return; |
| 1225 | } |
| 1226 | |
Jacob Erlbeck | 006c038 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 1227 | if (TLVP_PRESENT(&tp, BSSGP_IE_ROUTEING_AREA)) { |
Jacob Erlbeck | 67a4445 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 1228 | gbprox_patch_raid((uint8_t *)TLVP_VAL(&tp, BSSGP_IE_ROUTEING_AREA), |
Jacob Erlbeck | 006c038 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 1229 | peer, to_bss, "ROUTING_AREA"); |
| 1230 | } |
Jacob Erlbeck | 67a4445 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 1231 | |
| 1232 | if (TLVP_PRESENT(&tp, BSSGP_IE_CELL_ID)) |
| 1233 | gbprox_patch_raid((uint8_t *)TLVP_VAL(&tp, BSSGP_IE_CELL_ID), |
Jacob Erlbeck | 006c038 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 1234 | peer, to_bss, "CELL_ID"); |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1235 | |
| 1236 | if (TLVP_PRESENT(&tp, BSSGP_IE_LLC_PDU) && |
| 1237 | patching_is_enabled(GBPROX_PATCH_LLC_ATTACH_REQ)) { |
| 1238 | uint8_t *llc = (uint8_t *)TLVP_VAL(&tp, BSSGP_IE_LLC_PDU); |
| 1239 | size_t llc_len = TLVP_LEN(&tp, BSSGP_IE_LLC_PDU); |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 1240 | struct gbproxy_parse_context parse_ctx = {0}; |
Jacob Erlbeck | 03551e5 | 2014-06-27 19:56:05 +0200 | [diff] [blame] | 1241 | int len_change = 0; |
Jacob Erlbeck | 35cc03f | 2014-06-27 19:00:45 +0200 | [diff] [blame] | 1242 | parse_ctx.bssgp_tp = &tp; |
| 1243 | parse_ctx.bud_hdr = budh; |
| 1244 | parse_ctx.tlli = budh ? ntohl(budh->tlli) : 0; |
| 1245 | parse_ctx.to_bss = to_bss; |
| 1246 | |
| 1247 | if (TLVP_PRESENT(&tp, BSSGP_IE_IMSI)) { |
| 1248 | parse_ctx.imsi = TLVP_VAL(&tp, BSSGP_IE_IMSI); |
| 1249 | parse_ctx.imsi_len = TLVP_LEN(&tp, BSSGP_IE_IMSI); |
| 1250 | } |
| 1251 | |
Jacob Erlbeck | 03551e5 | 2014-06-27 19:56:05 +0200 | [diff] [blame] | 1252 | gbprox_patch_llc(msg, llc, llc_len, peer, &len_change, &parse_ctx); |
| 1253 | |
| 1254 | if (len_change) { |
| 1255 | llc_len += len_change; |
| 1256 | |
| 1257 | /* Fix LLC IE len */ |
| 1258 | /* TODO: This is a kludge, but the a pointer to the |
| 1259 | * start of the IE is not available here */ |
| 1260 | if (llc[-2] == BSSGP_IE_LLC_PDU && llc[-1] & 0x80) { |
| 1261 | /* most probably a one byte length */ |
| 1262 | if (llc_len > 127) { |
| 1263 | err_info = "Cannot increase size"; |
| 1264 | err_ctr = GBPROX_PEER_CTR_PATCH_ERR; |
| 1265 | goto patch_error; |
| 1266 | } |
| 1267 | llc[-1] = llc_len | 0x80; |
| 1268 | } else { |
| 1269 | llc[-2] = (llc_len >> 8) & 0x7f; |
| 1270 | llc[-1] = llc_len & 0xff; |
| 1271 | } |
| 1272 | } |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 1273 | /* Note that the tp struct might contain invalid pointers here |
| 1274 | * if the LLC field has changed its size */ |
| 1275 | } |
Jacob Erlbeck | 03551e5 | 2014-06-27 19:56:05 +0200 | [diff] [blame] | 1276 | return; |
| 1277 | |
| 1278 | patch_error: |
| 1279 | OSMO_ASSERT(err_ctr >= 0); |
| 1280 | rate_ctr_inc(&peer->ctrg->ctr[err_ctr]); |
| 1281 | LOGP(DGPRS, LOGL_ERROR, |
| 1282 | "Failed to patch BSSGP message as requested: %s.\n", err_info); |
Jacob Erlbeck | 67a4445 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 1283 | } |
| 1284 | |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1285 | /* feed a message down the NS-VC associated with the specified peer */ |
Jacob Erlbeck | 006c038 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 1286 | static int gbprox_relay2sgsn(struct msgb *old_msg, |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 1287 | struct gbproxy_peer *peer, uint16_t ns_bvci) |
Harald Welte | 672f5c4 | 2010-05-03 18:54:58 +0200 | [diff] [blame] | 1288 | { |
Harald Welte | 39d0bb5 | 2010-05-12 18:10:25 +0000 | [diff] [blame] | 1289 | /* create a copy of the message so the old one can |
| 1290 | * be free()d safely when we return from gbprox_rcvmsg() */ |
Holger Hans Peter Freyther | 7127b02 | 2014-08-04 11:52:52 +0200 | [diff] [blame^] | 1291 | struct msgb *msg = gprs_msgb_copy(old_msg, "msgb_relay2sgsn"); |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1292 | int rc; |
Harald Welte | 39d0bb5 | 2010-05-12 18:10:25 +0000 | [diff] [blame] | 1293 | |
Jacob Erlbeck | 006c038 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 1294 | gbprox_patch_bssgp_message(msg, peer, 0); |
| 1295 | |
Harald Welte | e9ea269 | 2010-05-11 20:20:13 +0200 | [diff] [blame] | 1296 | DEBUGP(DGPRS, "NSEI=%u proxying BTS->SGSN (NS_BVCI=%u, NSEI=%u)\n", |
Harald Welte | 96f71f2 | 2010-05-03 19:28:05 +0200 | [diff] [blame] | 1297 | msgb_nsei(msg), ns_bvci, gbcfg.nsip_sgsn_nsei); |
Harald Welte | 44c4830 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 1298 | |
Harald Welte | 672f5c4 | 2010-05-03 18:54:58 +0200 | [diff] [blame] | 1299 | msgb_bvci(msg) = ns_bvci; |
| 1300 | msgb_nsei(msg) = gbcfg.nsip_sgsn_nsei; |
| 1301 | |
Harald Welte | 69619e3 | 2010-05-03 19:05:10 +0200 | [diff] [blame] | 1302 | strip_ns_hdr(msg); |
| 1303 | |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1304 | rc = gprs_ns_sendmsg(bssgp_nsi, msg); |
| 1305 | if (rc < 0) |
Holger Hans Peter Freyther | a7027a0 | 2014-08-04 11:19:56 +0200 | [diff] [blame] | 1306 | rate_ctr_inc(&gbcfg.ctrg->ctr[GBPROX_GLOB_CTR_TX_ERR_SGSN]); |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1307 | |
| 1308 | return rc; |
Harald Welte | 672f5c4 | 2010-05-03 18:54:58 +0200 | [diff] [blame] | 1309 | } |
| 1310 | |
Harald Welte | 672f5c4 | 2010-05-03 18:54:58 +0200 | [diff] [blame] | 1311 | /* feed a message down the NS-VC associated with the specified peer */ |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 1312 | static int gbprox_relay2peer(struct msgb *old_msg, struct gbproxy_peer *peer, |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1313 | uint16_t ns_bvci) |
| 1314 | { |
Harald Welte | 39d0bb5 | 2010-05-12 18:10:25 +0000 | [diff] [blame] | 1315 | /* create a copy of the message so the old one can |
| 1316 | * be free()d safely when we return from gbprox_rcvmsg() */ |
Holger Hans Peter Freyther | 7127b02 | 2014-08-04 11:52:52 +0200 | [diff] [blame^] | 1317 | struct msgb *msg = gprs_msgb_copy(old_msg, "msgb_relay2peer"); |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1318 | int rc; |
Harald Welte | 39d0bb5 | 2010-05-12 18:10:25 +0000 | [diff] [blame] | 1319 | |
Harald Welte | 0ab535b | 2010-05-13 10:34:56 +0200 | [diff] [blame] | 1320 | DEBUGP(DGPRS, "NSEI=%u proxying SGSN->BSS (NS_BVCI=%u, NSEI=%u)\n", |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1321 | msgb_nsei(msg), ns_bvci, peer->nsei); |
Harald Welte | 44c4830 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 1322 | |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1323 | msgb_bvci(msg) = ns_bvci; |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1324 | msgb_nsei(msg) = peer->nsei; |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1325 | |
Harald Welte | 0ab535b | 2010-05-13 10:34:56 +0200 | [diff] [blame] | 1326 | /* Strip the old NS header, it will be replaced with a new one */ |
Harald Welte | 69619e3 | 2010-05-03 19:05:10 +0200 | [diff] [blame] | 1327 | strip_ns_hdr(msg); |
| 1328 | |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1329 | rc = gprs_ns_sendmsg(bssgp_nsi, msg); |
| 1330 | if (rc < 0) |
| 1331 | rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_TX_ERR]); |
| 1332 | |
| 1333 | return rc; |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1334 | } |
| 1335 | |
Harald Welte | 36f98d9 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 1336 | static int block_unblock_peer(uint16_t ptp_bvci, uint8_t pdu_type) |
| 1337 | { |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 1338 | struct gbproxy_peer *peer; |
Harald Welte | 36f98d9 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 1339 | |
| 1340 | peer = peer_by_bvci(ptp_bvci); |
| 1341 | if (!peer) { |
| 1342 | LOGP(DGPRS, LOGL_ERROR, "BVCI=%u: Cannot find BSS\n", |
| 1343 | ptp_bvci); |
Holger Hans Peter Freyther | a7027a0 | 2014-08-04 11:19:56 +0200 | [diff] [blame] | 1344 | rate_ctr_inc(&gbcfg.ctrg->ctr[GBPROX_GLOB_CTR_INV_BVCI]); |
Harald Welte | 36f98d9 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 1345 | return -ENOENT; |
| 1346 | } |
| 1347 | |
| 1348 | switch (pdu_type) { |
| 1349 | case BSSGP_PDUT_BVC_BLOCK_ACK: |
| 1350 | peer->blocked = 1; |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1351 | rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_BLOCKED]); |
Harald Welte | 36f98d9 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 1352 | break; |
| 1353 | case BSSGP_PDUT_BVC_UNBLOCK_ACK: |
| 1354 | peer->blocked = 0; |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1355 | rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_UNBLOCKED]); |
Harald Welte | 36f98d9 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 1356 | break; |
| 1357 | default: |
| 1358 | break; |
| 1359 | } |
| 1360 | return 0; |
| 1361 | } |
| 1362 | |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1363 | /* Send a message to a peer identified by ptp_bvci but using ns_bvci |
| 1364 | * in the NS hdr */ |
Harald Welte | 69619e3 | 2010-05-03 19:05:10 +0200 | [diff] [blame] | 1365 | static int gbprox_relay2bvci(struct msgb *msg, uint16_t ptp_bvci, |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1366 | uint16_t ns_bvci) |
| 1367 | { |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 1368 | struct gbproxy_peer *peer; |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1369 | |
| 1370 | peer = peer_by_bvci(ptp_bvci); |
Harald Welte | 1c77c6e | 2010-05-03 21:37:11 +0200 | [diff] [blame] | 1371 | if (!peer) { |
Harald Welte | 4cf12e9 | 2010-05-13 14:14:56 +0200 | [diff] [blame] | 1372 | LOGP(DGPRS, LOGL_ERROR, "BVCI=%u: Cannot find BSS\n", |
Harald Welte | 1c77c6e | 2010-05-03 21:37:11 +0200 | [diff] [blame] | 1373 | ptp_bvci); |
Holger Hans Peter Freyther | a7027a0 | 2014-08-04 11:19:56 +0200 | [diff] [blame] | 1374 | rate_ctr_inc(&gbcfg.ctrg->ctr[GBPROX_GLOB_CTR_INV_BVCI]); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1375 | return -ENOENT; |
Harald Welte | 1c77c6e | 2010-05-03 21:37:11 +0200 | [diff] [blame] | 1376 | } |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1377 | |
Harald Welte | 69619e3 | 2010-05-03 19:05:10 +0200 | [diff] [blame] | 1378 | return gbprox_relay2peer(msg, peer, ns_bvci); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1379 | } |
| 1380 | |
Harald Welte | b1fd902 | 2012-06-17 12:16:31 +0800 | [diff] [blame] | 1381 | int bssgp_prim_cb(struct osmo_prim_hdr *oph, void *ctx) |
| 1382 | { |
| 1383 | return 0; |
| 1384 | } |
| 1385 | |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1386 | /* Receive an incoming signalling message from a BSS-side NS-VC */ |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1387 | static int gbprox_rx_sig_from_bss(struct msgb *msg, uint16_t nsei, |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1388 | uint16_t ns_bvci) |
| 1389 | { |
Harald Welte | ca3620a | 2010-05-03 16:30:59 +0200 | [diff] [blame] | 1390 | struct bssgp_normal_hdr *bgph = (struct bssgp_normal_hdr *) msgb_bssgph(msg); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1391 | struct tlv_parsed tp; |
| 1392 | uint8_t pdu_type = bgph->pdu_type; |
Harald Welte | ca3620a | 2010-05-03 16:30:59 +0200 | [diff] [blame] | 1393 | int data_len = msgb_bssgp_len(msg) - sizeof(*bgph); |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 1394 | struct gbproxy_peer *from_peer = NULL; |
Harald Welte | 70f38d2 | 2010-05-01 12:10:57 +0200 | [diff] [blame] | 1395 | struct gprs_ra_id raid; |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1396 | |
Harald Welte | c471d3d | 2011-02-06 17:13:12 +0100 | [diff] [blame] | 1397 | if (ns_bvci != 0 && ns_bvci != 1) { |
Harald Welte | 4cf12e9 | 2010-05-13 14:14:56 +0200 | [diff] [blame] | 1398 | LOGP(DGPRS, LOGL_NOTICE, "NSEI=%u BVCI=%u is not signalling\n", |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1399 | nsei, ns_bvci); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1400 | return -EINVAL; |
| 1401 | } |
| 1402 | |
| 1403 | /* we actually should never see those two for BVCI == 0, but double-check |
| 1404 | * just to make sure */ |
| 1405 | if (pdu_type == BSSGP_PDUT_UL_UNITDATA || |
| 1406 | pdu_type == BSSGP_PDUT_DL_UNITDATA) { |
Harald Welte | 44c4830 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 1407 | LOGP(DGPRS, LOGL_NOTICE, "NSEI=%u UNITDATA not allowed in " |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1408 | "signalling\n", nsei); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1409 | return -EINVAL; |
| 1410 | } |
| 1411 | |
| 1412 | bssgp_tlv_parse(&tp, bgph->data, data_len); |
| 1413 | |
| 1414 | switch (pdu_type) { |
| 1415 | case BSSGP_PDUT_SUSPEND: |
| 1416 | case BSSGP_PDUT_RESUME: |
Jacob Erlbeck | 8f50359 | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 1417 | /* We implement RAI snooping during SUSPEND/RESUME, since it |
| 1418 | * establishes a relationsip between BVCI/peer and the routeing |
| 1419 | * area identification. The snooped information is then used |
| 1420 | * for routing the {SUSPEND,RESUME}_[N]ACK back to the correct |
| 1421 | * BSSGP */ |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1422 | if (!TLVP_PRESENT(&tp, BSSGP_IE_ROUTEING_AREA)) |
| 1423 | goto err_mand_ie; |
Holger Hans Peter Freyther | 16f30b5 | 2014-08-04 11:24:25 +0200 | [diff] [blame] | 1424 | from_peer = gbprox_peer_by_nsei(nsei); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1425 | if (!from_peer) |
| 1426 | goto err_no_peer; |
Harald Welte | 1174c08 | 2010-05-12 00:07:29 +0200 | [diff] [blame] | 1427 | memcpy(from_peer->ra, TLVP_VAL(&tp, BSSGP_IE_ROUTEING_AREA), |
| 1428 | sizeof(from_peer->ra)); |
Harald Welte | 7fc9822 | 2010-05-11 10:15:42 +0200 | [diff] [blame] | 1429 | gsm48_parse_ra(&raid, from_peer->ra); |
Harald Welte | 4cf12e9 | 2010-05-13 14:14:56 +0200 | [diff] [blame] | 1430 | LOGP(DGPRS, LOGL_INFO, "NSEI=%u BSSGP SUSPEND/RESUME " |
Jacob Erlbeck | 8f50359 | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 1431 | "RAI snooping: RAI %u-%u-%u-%u behind BVCI=%u\n", |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1432 | nsei, raid.mcc, raid.mnc, raid.lac, |
| 1433 | raid.rac , from_peer->bvci); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1434 | /* FIXME: This only supports one BSS per RA */ |
| 1435 | break; |
Harald Welte | 44c4830 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 1436 | case BSSGP_PDUT_BVC_RESET: |
| 1437 | /* If we receive a BVC reset on the signalling endpoint, we |
| 1438 | * don't want the SGSN to reset, as the signalling endpoint |
| 1439 | * is common for all point-to-point BVCs (and thus all BTS) */ |
| 1440 | if (TLVP_PRESENT(&tp, BSSGP_IE_BVCI)) { |
Holger Hans Peter Freyther | ffd6856 | 2012-09-04 20:42:20 +0200 | [diff] [blame] | 1441 | uint16_t bvci = ntohs(tlvp_val16_unal(&tp, BSSGP_IE_BVCI)); |
Harald Welte | 72953b8 | 2010-05-12 00:20:41 +0200 | [diff] [blame] | 1442 | LOGP(DGPRS, LOGL_INFO, "NSEI=%u Rx BVC RESET (BVCI=%u)\n", |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1443 | nsei, bvci); |
Harald Welte | 44c4830 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 1444 | if (bvci == 0) { |
| 1445 | /* FIXME: only do this if SGSN is alive! */ |
Harald Welte | e9ea269 | 2010-05-11 20:20:13 +0200 | [diff] [blame] | 1446 | LOGP(DGPRS, LOGL_INFO, "NSEI=%u Tx fake " |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1447 | "BVC RESET ACK of BVCI=0\n", nsei); |
Harald Welte | 44c4830 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 1448 | return bssgp_tx_simple_bvci(BSSGP_PDUT_BVC_RESET_ACK, |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1449 | nsei, 0, ns_bvci); |
Harald Welte | 1174c08 | 2010-05-12 00:07:29 +0200 | [diff] [blame] | 1450 | } |
| 1451 | from_peer = peer_by_bvci(bvci); |
| 1452 | if (!from_peer) { |
Harald Welte | 1c77c6e | 2010-05-03 21:37:11 +0200 | [diff] [blame] | 1453 | /* if a PTP-BVC is reset, and we don't know that |
| 1454 | * PTP-BVCI yet, we should allocate a new peer */ |
| 1455 | LOGP(DGPRS, LOGL_INFO, "Allocationg new peer for " |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1456 | "BVCI=%u via NSEI=%u\n", bvci, nsei); |
Harald Welte | 1c77c6e | 2010-05-03 21:37:11 +0200 | [diff] [blame] | 1457 | from_peer = peer_alloc(bvci); |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1458 | from_peer->nsei = nsei; |
Harald Welte | 44c4830 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 1459 | } |
Jacob Erlbeck | 64cb924 | 2013-10-24 12:48:56 +0200 | [diff] [blame] | 1460 | |
| 1461 | if (!check_peer_nsei(from_peer, nsei)) |
| 1462 | from_peer->nsei = nsei; |
| 1463 | |
Harald Welte | 1174c08 | 2010-05-12 00:07:29 +0200 | [diff] [blame] | 1464 | if (TLVP_PRESENT(&tp, BSSGP_IE_CELL_ID)) { |
| 1465 | struct gprs_ra_id raid; |
| 1466 | /* We have a Cell Identifier present in this |
| 1467 | * PDU, this means we can extend our local |
| 1468 | * state information about this particular cell |
| 1469 | * */ |
| 1470 | memcpy(from_peer->ra, |
| 1471 | TLVP_VAL(&tp, BSSGP_IE_CELL_ID), |
| 1472 | sizeof(from_peer->ra)); |
| 1473 | gsm48_parse_ra(&raid, from_peer->ra); |
| 1474 | LOGP(DGPRS, LOGL_INFO, "NSEI=%u/BVCI=%u " |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1475 | "Cell ID %u-%u-%u-%u\n", nsei, |
Harald Welte | 1174c08 | 2010-05-12 00:07:29 +0200 | [diff] [blame] | 1476 | bvci, raid.mcc, raid.mnc, raid.lac, |
| 1477 | raid.rac); |
| 1478 | } |
Harald Welte | 44c4830 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 1479 | } |
| 1480 | break; |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1481 | } |
| 1482 | |
Harald Welte | e9ea269 | 2010-05-11 20:20:13 +0200 | [diff] [blame] | 1483 | /* Normally, we can simply pass on all signalling messages from BSS to |
| 1484 | * SGSN */ |
Jacob Erlbeck | 006c038 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 1485 | return gbprox_relay2sgsn(msg, from_peer, ns_bvci); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1486 | err_no_peer: |
Jacob Erlbeck | c5085f9 | 2013-10-18 13:04:48 +0200 | [diff] [blame] | 1487 | LOGP(DGPRS, LOGL_ERROR, "NSEI=%u(BSS) cannot find peer based on NSEI\n", |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1488 | nsei); |
Holger Hans Peter Freyther | a7027a0 | 2014-08-04 11:19:56 +0200 | [diff] [blame] | 1489 | rate_ctr_inc(&gbcfg.ctrg->ctr[GBPROX_GLOB_CTR_INV_NSEI]); |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1490 | return bssgp_tx_status(BSSGP_CAUSE_UNKNOWN_BVCI, NULL, msg); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1491 | err_mand_ie: |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1492 | LOGP(DGPRS, LOGL_ERROR, "NSEI=%u(BSS) missing mandatory RA IE\n", |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1493 | nsei); |
Holger Hans Peter Freyther | a7027a0 | 2014-08-04 11:19:56 +0200 | [diff] [blame] | 1494 | rate_ctr_inc(&gbcfg.ctrg->ctr[GBPROX_GLOB_CTR_PROTO_ERR_BSS]); |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1495 | return bssgp_tx_status(BSSGP_CAUSE_MISSING_MAND_IE, NULL, msg); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1496 | } |
| 1497 | |
| 1498 | /* Receive paging request from SGSN, we need to relay to proper BSS */ |
| 1499 | static int gbprox_rx_paging(struct msgb *msg, struct tlv_parsed *tp, |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1500 | uint32_t nsei, uint16_t ns_bvci) |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1501 | { |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 1502 | struct gbproxy_peer *peer = NULL; |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1503 | int errctr = GBPROX_GLOB_CTR_PROTO_ERR_SGSN; |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1504 | |
Harald Welte | 4cf12e9 | 2010-05-13 14:14:56 +0200 | [diff] [blame] | 1505 | LOGP(DGPRS, LOGL_INFO, "NSEI=%u(SGSN) BSSGP PAGING ", |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1506 | nsei); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1507 | if (TLVP_PRESENT(tp, BSSGP_IE_BVCI)) { |
Holger Hans Peter Freyther | ffd6856 | 2012-09-04 20:42:20 +0200 | [diff] [blame] | 1508 | uint16_t bvci = ntohs(tlvp_val16_unal(tp, BSSGP_IE_BVCI)); |
Harald Welte | 4cf12e9 | 2010-05-13 14:14:56 +0200 | [diff] [blame] | 1509 | LOGPC(DGPRS, LOGL_INFO, "routing by BVCI to peer BVCI=%u\n", |
| 1510 | bvci); |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1511 | errctr = GBPROX_GLOB_CTR_OTHER_ERR; |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1512 | } else if (TLVP_PRESENT(tp, BSSGP_IE_ROUTEING_AREA)) { |
Jacob Erlbeck | 8f50359 | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 1513 | peer = peer_by_rai(TLVP_VAL(tp, BSSGP_IE_ROUTEING_AREA)); |
| 1514 | LOGPC(DGPRS, LOGL_INFO, "routing by RAI to peer BVCI=%u\n", |
Holger Hans Peter Freyther | 62eaf54 | 2010-06-08 16:30:24 +0800 | [diff] [blame] | 1515 | peer ? peer->bvci : -1); |
Jacob Erlbeck | 8f50359 | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 1516 | errctr = GBPROX_GLOB_CTR_INV_RAI; |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1517 | } else if (TLVP_PRESENT(tp, BSSGP_IE_LOCATION_AREA)) { |
Jacob Erlbeck | 8f50359 | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 1518 | peer = peer_by_lai(TLVP_VAL(tp, BSSGP_IE_LOCATION_AREA)); |
| 1519 | LOGPC(DGPRS, LOGL_INFO, "routing by LAI to peer BVCI=%u\n", |
Holger Hans Peter Freyther | 62eaf54 | 2010-06-08 16:30:24 +0800 | [diff] [blame] | 1520 | peer ? peer->bvci : -1); |
Jacob Erlbeck | 8f50359 | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 1521 | errctr = GBPROX_GLOB_CTR_INV_LAI; |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1522 | } else |
Harald Welte | 4cf12e9 | 2010-05-13 14:14:56 +0200 | [diff] [blame] | 1523 | LOGPC(DGPRS, LOGL_INFO, "\n"); |
| 1524 | |
| 1525 | if (!peer) { |
| 1526 | LOGP(DGPRS, LOGL_ERROR, "NSEI=%u(SGSN) BSSGP PAGING: " |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1527 | "unable to route, missing IE\n", nsei); |
Holger Hans Peter Freyther | a7027a0 | 2014-08-04 11:19:56 +0200 | [diff] [blame] | 1528 | rate_ctr_inc(&gbcfg.ctrg->ctr[errctr]); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1529 | return -EINVAL; |
Harald Welte | 4cf12e9 | 2010-05-13 14:14:56 +0200 | [diff] [blame] | 1530 | } |
| 1531 | return gbprox_relay2peer(msg, peer, ns_bvci); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1532 | } |
| 1533 | |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1534 | /* Receive an incoming BVC-RESET message from the SGSN */ |
| 1535 | static int rx_reset_from_sgsn(struct msgb *msg, struct tlv_parsed *tp, |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1536 | uint32_t nsei, uint16_t ns_bvci) |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1537 | { |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 1538 | struct gbproxy_peer *peer; |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1539 | uint16_t ptp_bvci; |
| 1540 | |
| 1541 | if (!TLVP_PRESENT(tp, BSSGP_IE_BVCI)) { |
Holger Hans Peter Freyther | a7027a0 | 2014-08-04 11:19:56 +0200 | [diff] [blame] | 1542 | rate_ctr_inc(&gbcfg.ctrg-> |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1543 | ctr[GBPROX_GLOB_CTR_PROTO_ERR_SGSN]); |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1544 | return bssgp_tx_status(BSSGP_CAUSE_MISSING_MAND_IE, |
| 1545 | NULL, msg); |
| 1546 | } |
Holger Hans Peter Freyther | ffd6856 | 2012-09-04 20:42:20 +0200 | [diff] [blame] | 1547 | ptp_bvci = ntohs(tlvp_val16_unal(tp, BSSGP_IE_BVCI)); |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1548 | |
| 1549 | if (ptp_bvci >= 2) { |
| 1550 | /* A reset for a PTP BVC was received, forward it to its |
| 1551 | * respective peer */ |
| 1552 | peer = peer_by_bvci(ptp_bvci); |
| 1553 | if (!peer) { |
Harald Welte | 4cf12e9 | 2010-05-13 14:14:56 +0200 | [diff] [blame] | 1554 | LOGP(DGPRS, LOGL_ERROR, "NSEI=%u BVCI=%u: Cannot find BSS\n", |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1555 | nsei, ptp_bvci); |
Holger Hans Peter Freyther | a7027a0 | 2014-08-04 11:19:56 +0200 | [diff] [blame] | 1556 | rate_ctr_inc(&gbcfg.ctrg-> |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1557 | ctr[GBPROX_GLOB_CTR_INV_BVCI]); |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1558 | return bssgp_tx_status(BSSGP_CAUSE_UNKNOWN_BVCI, |
| 1559 | NULL, msg); |
| 1560 | } |
| 1561 | return gbprox_relay2peer(msg, peer, ns_bvci); |
| 1562 | } |
| 1563 | |
| 1564 | /* A reset for the Signalling entity has been received |
| 1565 | * from the SGSN. As the signalling BVCI is shared |
| 1566 | * among all the BSS's that we multiplex, it needs to |
| 1567 | * be relayed */ |
Holger Hans Peter Freyther | 18739ea | 2014-08-04 11:10:09 +0200 | [diff] [blame] | 1568 | llist_for_each_entry(peer, &gbcfg.bts_peers, list) |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1569 | gbprox_relay2peer(msg, peer, ns_bvci); |
| 1570 | |
| 1571 | return 0; |
| 1572 | } |
| 1573 | |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1574 | /* Receive an incoming signalling message from the SGSN-side NS-VC */ |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1575 | static int gbprox_rx_sig_from_sgsn(struct msgb *msg, uint32_t nsei, |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1576 | uint16_t ns_bvci) |
| 1577 | { |
Harald Welte | ca3620a | 2010-05-03 16:30:59 +0200 | [diff] [blame] | 1578 | struct bssgp_normal_hdr *bgph = (struct bssgp_normal_hdr *) msgb_bssgph(msg); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1579 | struct tlv_parsed tp; |
| 1580 | uint8_t pdu_type = bgph->pdu_type; |
Harald Welte | ca3620a | 2010-05-03 16:30:59 +0200 | [diff] [blame] | 1581 | int data_len = msgb_bssgp_len(msg) - sizeof(*bgph); |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 1582 | struct gbproxy_peer *peer; |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1583 | uint16_t bvci; |
| 1584 | int rc = 0; |
| 1585 | |
Harald Welte | c471d3d | 2011-02-06 17:13:12 +0100 | [diff] [blame] | 1586 | if (ns_bvci != 0 && ns_bvci != 1) { |
Harald Welte | 4cf12e9 | 2010-05-13 14:14:56 +0200 | [diff] [blame] | 1587 | LOGP(DGPRS, LOGL_NOTICE, "NSEI=%u(SGSN) BVCI=%u is not " |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1588 | "signalling\n", nsei, ns_bvci); |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1589 | /* FIXME: Send proper error message */ |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1590 | return -EINVAL; |
| 1591 | } |
| 1592 | |
| 1593 | /* we actually should never see those two for BVCI == 0, but double-check |
| 1594 | * just to make sure */ |
| 1595 | if (pdu_type == BSSGP_PDUT_UL_UNITDATA || |
| 1596 | pdu_type == BSSGP_PDUT_DL_UNITDATA) { |
Harald Welte | 44c4830 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 1597 | LOGP(DGPRS, LOGL_NOTICE, "NSEI=%u(SGSN) UNITDATA not allowed in " |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1598 | "signalling\n", nsei); |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1599 | return bssgp_tx_status(BSSGP_CAUSE_PROTO_ERR_UNSPEC, NULL, msg); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1600 | } |
| 1601 | |
| 1602 | rc = bssgp_tlv_parse(&tp, bgph->data, data_len); |
| 1603 | |
| 1604 | switch (pdu_type) { |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1605 | case BSSGP_PDUT_BVC_RESET: |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1606 | rc = rx_reset_from_sgsn(msg, &tp, nsei, ns_bvci); |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1607 | break; |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1608 | case BSSGP_PDUT_FLUSH_LL: |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1609 | case BSSGP_PDUT_BVC_RESET_ACK: |
| 1610 | /* simple case: BVCI IE is mandatory */ |
| 1611 | if (!TLVP_PRESENT(&tp, BSSGP_IE_BVCI)) |
| 1612 | goto err_mand_ie; |
Holger Hans Peter Freyther | ffd6856 | 2012-09-04 20:42:20 +0200 | [diff] [blame] | 1613 | bvci = ntohs(tlvp_val16_unal(&tp, BSSGP_IE_BVCI)); |
Harald Welte | 69619e3 | 2010-05-03 19:05:10 +0200 | [diff] [blame] | 1614 | rc = gbprox_relay2bvci(msg, bvci, ns_bvci); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1615 | break; |
| 1616 | case BSSGP_PDUT_PAGING_PS: |
| 1617 | case BSSGP_PDUT_PAGING_CS: |
Jacob Erlbeck | 8f50359 | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 1618 | /* process the paging request (LAI/RAI lookup) */ |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1619 | rc = gbprox_rx_paging(msg, &tp, nsei, ns_bvci); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1620 | break; |
| 1621 | case BSSGP_PDUT_STATUS: |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1622 | /* Some exception has occurred */ |
Harald Welte | 44c4830 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 1623 | LOGP(DGPRS, LOGL_NOTICE, |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1624 | "NSEI=%u(SGSN) BSSGP STATUS ", nsei); |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1625 | if (!TLVP_PRESENT(&tp, BSSGP_IE_CAUSE)) { |
| 1626 | LOGPC(DGPRS, LOGL_NOTICE, "\n"); |
| 1627 | goto err_mand_ie; |
| 1628 | } |
| 1629 | LOGPC(DGPRS, LOGL_NOTICE, |
| 1630 | "cause=0x%02x(%s) ", *TLVP_VAL(&tp, BSSGP_IE_CAUSE), |
| 1631 | bssgp_cause_str(*TLVP_VAL(&tp, BSSGP_IE_CAUSE))); |
| 1632 | if (TLVP_PRESENT(&tp, BSSGP_IE_BVCI)) { |
Holger Hans Peter Freyther | ffd6856 | 2012-09-04 20:42:20 +0200 | [diff] [blame] | 1633 | uint16_t bvci = tlvp_val16_unal(&tp, BSSGP_IE_BVCI); |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1634 | LOGPC(DGPRS, LOGL_NOTICE, |
Holger Hans Peter Freyther | ffd6856 | 2012-09-04 20:42:20 +0200 | [diff] [blame] | 1635 | "BVCI=%u\n", ntohs(bvci)); |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1636 | } else |
| 1637 | LOGPC(DGPRS, LOGL_NOTICE, "\n"); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1638 | break; |
| 1639 | /* those only exist in the SGSN -> BSS direction */ |
| 1640 | case BSSGP_PDUT_SUSPEND_ACK: |
| 1641 | case BSSGP_PDUT_SUSPEND_NACK: |
| 1642 | case BSSGP_PDUT_RESUME_ACK: |
| 1643 | case BSSGP_PDUT_RESUME_NACK: |
Jacob Erlbeck | 8f50359 | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 1644 | /* RAI IE is mandatory */ |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1645 | if (!TLVP_PRESENT(&tp, BSSGP_IE_ROUTEING_AREA)) |
| 1646 | goto err_mand_ie; |
Jacob Erlbeck | 8f50359 | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 1647 | peer = peer_by_rai(TLVP_VAL(&tp, BSSGP_IE_ROUTEING_AREA)); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1648 | if (!peer) |
| 1649 | goto err_no_peer; |
Harald Welte | 69619e3 | 2010-05-03 19:05:10 +0200 | [diff] [blame] | 1650 | rc = gbprox_relay2peer(msg, peer, ns_bvci); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1651 | break; |
Harald Welte | 36f98d9 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 1652 | case BSSGP_PDUT_BVC_BLOCK_ACK: |
| 1653 | case BSSGP_PDUT_BVC_UNBLOCK_ACK: |
| 1654 | if (!TLVP_PRESENT(&tp, BSSGP_IE_BVCI)) |
| 1655 | goto err_mand_ie; |
Holger Hans Peter Freyther | ffd6856 | 2012-09-04 20:42:20 +0200 | [diff] [blame] | 1656 | bvci = ntohs(tlvp_val16_unal(&tp, BSSGP_IE_BVCI)); |
Harald Welte | 36f98d9 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 1657 | if (bvci == 0) { |
| 1658 | LOGP(DGPRS, LOGL_NOTICE, "NSEI=%u(SGSN) BSSGP " |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1659 | "%sBLOCK_ACK for signalling BVCI ?!?\n", nsei, |
Harald Welte | 36f98d9 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 1660 | pdu_type == BSSGP_PDUT_BVC_UNBLOCK_ACK ? "UN":""); |
| 1661 | /* should we send STATUS ? */ |
Holger Hans Peter Freyther | a7027a0 | 2014-08-04 11:19:56 +0200 | [diff] [blame] | 1662 | rate_ctr_inc(&gbcfg.ctrg-> |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1663 | ctr[GBPROX_GLOB_CTR_INV_BVCI]); |
Harald Welte | 36f98d9 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 1664 | } else { |
| 1665 | /* Mark BVC as (un)blocked */ |
| 1666 | block_unblock_peer(bvci, pdu_type); |
| 1667 | } |
| 1668 | rc = gbprox_relay2bvci(msg, bvci, ns_bvci); |
| 1669 | break; |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1670 | case BSSGP_PDUT_SGSN_INVOKE_TRACE: |
Harald Welte | 44c4830 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 1671 | LOGP(DGPRS, LOGL_ERROR, |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1672 | "NSEI=%u(SGSN) BSSGP INVOKE TRACE not supported\n",nsei); |
Holger Hans Peter Freyther | a7027a0 | 2014-08-04 11:19:56 +0200 | [diff] [blame] | 1673 | rate_ctr_inc(&gbcfg.ctrg-> |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1674 | ctr[GBPROX_GLOB_CTR_NOT_SUPPORTED_SGSN]); |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1675 | rc = bssgp_tx_status(BSSGP_CAUSE_PDU_INCOMP_FEAT, NULL, msg); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1676 | break; |
| 1677 | default: |
Harald Welte | 72953b8 | 2010-05-12 00:20:41 +0200 | [diff] [blame] | 1678 | LOGP(DGPRS, LOGL_NOTICE, "BSSGP PDU type 0x%02x unknown\n", |
| 1679 | pdu_type); |
Holger Hans Peter Freyther | a7027a0 | 2014-08-04 11:19:56 +0200 | [diff] [blame] | 1680 | rate_ctr_inc(&gbcfg.ctrg-> |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1681 | ctr[GBPROX_GLOB_CTR_PROTO_ERR_SGSN]); |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1682 | rc = bssgp_tx_status(BSSGP_CAUSE_PROTO_ERR_UNSPEC, NULL, msg); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1683 | break; |
| 1684 | } |
| 1685 | |
| 1686 | return rc; |
| 1687 | err_mand_ie: |
Harald Welte | 1c77c6e | 2010-05-03 21:37:11 +0200 | [diff] [blame] | 1688 | LOGP(DGPRS, LOGL_ERROR, "NSEI=%u(SGSN) missing mandatory IE\n", |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1689 | nsei); |
Holger Hans Peter Freyther | a7027a0 | 2014-08-04 11:19:56 +0200 | [diff] [blame] | 1690 | rate_ctr_inc(&gbcfg.ctrg-> |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1691 | ctr[GBPROX_GLOB_CTR_PROTO_ERR_SGSN]); |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1692 | return bssgp_tx_status(BSSGP_CAUSE_MISSING_MAND_IE, NULL, msg); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1693 | err_no_peer: |
Jacob Erlbeck | 8f50359 | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 1694 | LOGP(DGPRS, LOGL_ERROR, "NSEI=%u(SGSN) cannot find peer based on RAI\n", |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1695 | nsei); |
Holger Hans Peter Freyther | a7027a0 | 2014-08-04 11:19:56 +0200 | [diff] [blame] | 1696 | rate_ctr_inc(&gbcfg.ctrg-> ctr[GBPROX_GLOB_CTR_INV_RAI]); |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1697 | return bssgp_tx_status(BSSGP_CAUSE_UNKNOWN_BVCI, NULL, msg); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1698 | } |
| 1699 | |
| 1700 | /* Main input function for Gb proxy */ |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1701 | int gbprox_rcvmsg(struct msgb *msg, uint16_t nsei, uint16_t ns_bvci, uint16_t nsvci) |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1702 | { |
Harald Welte | 672f5c4 | 2010-05-03 18:54:58 +0200 | [diff] [blame] | 1703 | int rc; |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 1704 | struct gbproxy_peer *peer; |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1705 | int remote_end_is_sgsn = nsei == gbcfg.nsip_sgsn_nsei; |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1706 | |
Jacob Erlbeck | 67a4445 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 1707 | if (remote_end_is_sgsn) |
Jacob Erlbeck | 006c038 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 1708 | gbprox_patch_bssgp_message(msg, NULL, 1); |
Jacob Erlbeck | 67a4445 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 1709 | |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1710 | /* Only BVCI=0 messages need special treatment */ |
| 1711 | if (ns_bvci == 0 || ns_bvci == 1) { |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1712 | if (remote_end_is_sgsn) |
| 1713 | rc = gbprox_rx_sig_from_sgsn(msg, nsei, ns_bvci); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1714 | else |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1715 | rc = gbprox_rx_sig_from_bss(msg, nsei, ns_bvci); |
Harald Welte | 672f5c4 | 2010-05-03 18:54:58 +0200 | [diff] [blame] | 1716 | } else { |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1717 | peer = peer_by_bvci(ns_bvci); |
| 1718 | |
Harald Welte | 672f5c4 | 2010-05-03 18:54:58 +0200 | [diff] [blame] | 1719 | /* All other BVCI are PTP and thus can be simply forwarded */ |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1720 | if (!remote_end_is_sgsn) { |
| 1721 | if (peer) |
| 1722 | check_peer_nsei(peer, nsei); |
Jacob Erlbeck | 006c038 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 1723 | return gbprox_relay2sgsn(msg, peer, ns_bvci); |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1724 | } |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1725 | |
Harald Welte | 36f98d9 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 1726 | /* else: SGSN -> BSS direction */ |
Harald Welte | 36f98d9 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 1727 | if (!peer) { |
Jacob Erlbeck | f0f63a4 | 2013-10-18 22:12:17 +0200 | [diff] [blame] | 1728 | LOGP(DGPRS, LOGL_INFO, "Didn't find peer for " |
| 1729 | "BVCI=%u for message from NSVC=%u/NSEI=%u (SGSN)\n", |
| 1730 | ns_bvci, nsvci, nsei); |
Holger Hans Peter Freyther | a7027a0 | 2014-08-04 11:19:56 +0200 | [diff] [blame] | 1731 | rate_ctr_inc(&gbcfg.ctrg-> |
Jacob Erlbeck | f0f63a4 | 2013-10-18 22:12:17 +0200 | [diff] [blame] | 1732 | ctr[GBPROX_GLOB_CTR_INV_BVCI]); |
| 1733 | return bssgp_tx_status(BSSGP_CAUSE_UNKNOWN_BVCI, |
| 1734 | &ns_bvci, msg); |
Harald Welte | 36f98d9 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 1735 | } |
| 1736 | if (peer->blocked) { |
| 1737 | LOGP(DGPRS, LOGL_NOTICE, "Dropping PDU for " |
| 1738 | "blocked BVCI=%u via NSVC=%u/NSEI=%u\n", |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1739 | ns_bvci, nsvci, nsei); |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1740 | rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_DROPPED]); |
Harald Welte | 36f98d9 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 1741 | return bssgp_tx_status(BSSGP_CAUSE_BVCI_BLOCKED, NULL, msg); |
| 1742 | } |
| 1743 | rc = gbprox_relay2peer(msg, peer, ns_bvci); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1744 | } |
| 1745 | |
Harald Welte | 672f5c4 | 2010-05-03 18:54:58 +0200 | [diff] [blame] | 1746 | return rc; |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1747 | } |
Harald Welte | 85801d0 | 2010-05-11 05:49:43 +0200 | [diff] [blame] | 1748 | |
Harald Welte | 1ccbf44 | 2010-05-14 11:53:08 +0000 | [diff] [blame] | 1749 | int gbprox_reset_persistent_nsvcs(struct gprs_ns_inst *nsi) |
| 1750 | { |
| 1751 | struct gprs_nsvc *nsvc; |
| 1752 | |
| 1753 | llist_for_each_entry(nsvc, &nsi->gprs_nsvcs, list) { |
| 1754 | if (!nsvc->persistent) |
| 1755 | continue; |
| 1756 | gprs_nsvc_reset(nsvc, NS_CAUSE_OM_INTERVENTION); |
| 1757 | } |
| 1758 | return 0; |
| 1759 | } |
| 1760 | |
Harald Welte | c1c1dd2 | 2010-05-11 06:34:24 +0200 | [diff] [blame] | 1761 | /* Signal handler for signals from NS layer */ |
| 1762 | int gbprox_signal(unsigned int subsys, unsigned int signal, |
| 1763 | void *handler_data, void *signal_data) |
| 1764 | { |
| 1765 | struct ns_signal_data *nssd = signal_data; |
| 1766 | struct gprs_nsvc *nsvc = nssd->nsvc; |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 1767 | struct gbproxy_peer *peer; |
Harald Welte | c1c1dd2 | 2010-05-11 06:34:24 +0200 | [diff] [blame] | 1768 | |
Harald Welte | a6a20b4 | 2012-06-16 16:40:42 +0800 | [diff] [blame] | 1769 | if (subsys != SS_L_NS) |
Harald Welte | c1c1dd2 | 2010-05-11 06:34:24 +0200 | [diff] [blame] | 1770 | return 0; |
| 1771 | |
Harald Welte | f69c059 | 2010-05-11 18:29:44 +0200 | [diff] [blame] | 1772 | if (signal == S_NS_RESET && nsvc->nsei == gbcfg.nsip_sgsn_nsei) { |
| 1773 | /* We have received a NS-RESET from the NSEI and NSVC |
| 1774 | * of the SGSN. This might happen with SGSN that start |
| 1775 | * their own NS-RESET procedure without waiting for our |
| 1776 | * NS-RESET */ |
| 1777 | nsvc->remote_end_is_sgsn = 1; |
| 1778 | } |
| 1779 | |
Harald Welte | b778d2c | 2010-05-12 13:28:25 +0000 | [diff] [blame] | 1780 | if (signal == S_NS_ALIVE_EXP && nsvc->remote_end_is_sgsn) { |
| 1781 | LOGP(DGPRS, LOGL_NOTICE, "Tns alive expired too often, " |
| 1782 | "re-starting RESET procedure\n"); |
Holger Hans Peter Freyther | a7027a0 | 2014-08-04 11:19:56 +0200 | [diff] [blame] | 1783 | rate_ctr_inc(&gbcfg.ctrg-> |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1784 | ctr[GBPROX_GLOB_CTR_RESTART_RESET_SGSN]); |
Harald Welte | e6599ee | 2012-06-17 12:25:53 +0800 | [diff] [blame] | 1785 | gprs_ns_nsip_connect(nsvc->nsi, &nsvc->ip.bts_addr, |
| 1786 | nsvc->nsei, nsvc->nsvci); |
Harald Welte | b778d2c | 2010-05-12 13:28:25 +0000 | [diff] [blame] | 1787 | } |
| 1788 | |
Harald Welte | 5e106d7 | 2011-02-06 16:33:29 +0100 | [diff] [blame] | 1789 | if (!nsvc->remote_end_is_sgsn) { |
| 1790 | /* from BSS to SGSN */ |
Holger Hans Peter Freyther | 16f30b5 | 2014-08-04 11:24:25 +0200 | [diff] [blame] | 1791 | peer = gbprox_peer_by_nsei(nsvc->nsei); |
Harald Welte | 5e106d7 | 2011-02-06 16:33:29 +0100 | [diff] [blame] | 1792 | if (!peer) { |
| 1793 | LOGP(DGPRS, LOGL_NOTICE, "signal %u for unknown peer " |
| 1794 | "NSEI=%u/NSVCI=%u\n", signal, nsvc->nsei, |
| 1795 | nsvc->nsvci); |
| 1796 | return 0; |
| 1797 | } |
Harald Welte | c1c1dd2 | 2010-05-11 06:34:24 +0200 | [diff] [blame] | 1798 | switch (signal) { |
| 1799 | case S_NS_RESET: |
Harald Welte | c1c1dd2 | 2010-05-11 06:34:24 +0200 | [diff] [blame] | 1800 | case S_NS_BLOCK: |
Harald Welte | 5e106d7 | 2011-02-06 16:33:29 +0100 | [diff] [blame] | 1801 | if (!peer->blocked) |
| 1802 | break; |
| 1803 | LOGP(DGPRS, LOGL_NOTICE, "Converting NS_RESET from " |
| 1804 | "NSEI=%u/NSVCI=%u into BSSGP_BVC_BLOCK to SGSN\n", |
| 1805 | nsvc->nsei, nsvc->nsvci); |
| 1806 | bssgp_tx_simple_bvci(BSSGP_PDUT_BVC_BLOCK, nsvc->nsei, |
| 1807 | peer->bvci, 0); |
Harald Welte | c1c1dd2 | 2010-05-11 06:34:24 +0200 | [diff] [blame] | 1808 | break; |
Harald Welte | 5e106d7 | 2011-02-06 16:33:29 +0100 | [diff] [blame] | 1809 | } |
| 1810 | } else { |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1811 | /* Forward this message to all NS-VC to BSS */ |
| 1812 | struct gprs_ns_inst *nsi = gbcfg.nsi; |
| 1813 | struct gprs_nsvc *next_nsvc; |
| 1814 | |
| 1815 | llist_for_each_entry(next_nsvc, &nsi->gprs_nsvcs, list) { |
| 1816 | if (next_nsvc->remote_end_is_sgsn) |
| 1817 | continue; |
| 1818 | |
| 1819 | /* Note that the following does not start the full |
| 1820 | * procedures including timer based retransmissions. */ |
Harald Welte | 5e106d7 | 2011-02-06 16:33:29 +0100 | [diff] [blame] | 1821 | switch (signal) { |
| 1822 | case S_NS_RESET: |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1823 | gprs_ns_tx_reset(next_nsvc, nssd->cause); |
Harald Welte | 5e106d7 | 2011-02-06 16:33:29 +0100 | [diff] [blame] | 1824 | break; |
| 1825 | case S_NS_BLOCK: |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1826 | gprs_ns_tx_block(next_nsvc, nssd->cause); |
Harald Welte | 5e106d7 | 2011-02-06 16:33:29 +0100 | [diff] [blame] | 1827 | break; |
| 1828 | case S_NS_UNBLOCK: |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1829 | gprs_ns_tx_unblock(next_nsvc); |
Harald Welte | 5e106d7 | 2011-02-06 16:33:29 +0100 | [diff] [blame] | 1830 | break; |
| 1831 | } |
Harald Welte | c1c1dd2 | 2010-05-11 06:34:24 +0200 | [diff] [blame] | 1832 | } |
| 1833 | } |
| 1834 | return 0; |
| 1835 | } |
| 1836 | |
Jacob Erlbeck | 72b401f | 2013-10-24 12:48:55 +0200 | [diff] [blame] | 1837 | void gbprox_reset() |
| 1838 | { |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 1839 | struct gbproxy_peer *peer, *tmp; |
Jacob Erlbeck | 72b401f | 2013-10-24 12:48:55 +0200 | [diff] [blame] | 1840 | |
Holger Hans Peter Freyther | 18739ea | 2014-08-04 11:10:09 +0200 | [diff] [blame] | 1841 | llist_for_each_entry_safe(peer, tmp, &gbcfg.bts_peers, list) |
Jacob Erlbeck | 72b401f | 2013-10-24 12:48:55 +0200 | [diff] [blame] | 1842 | peer_free(peer); |
| 1843 | |
Holger Hans Peter Freyther | a7027a0 | 2014-08-04 11:19:56 +0200 | [diff] [blame] | 1844 | rate_ctr_group_free(gbcfg.ctrg); |
| 1845 | gbproxy_init_config(&gbcfg); |
Jacob Erlbeck | 72b401f | 2013-10-24 12:48:55 +0200 | [diff] [blame] | 1846 | } |
| 1847 | |
Holger Hans Peter Freyther | 18739ea | 2014-08-04 11:10:09 +0200 | [diff] [blame] | 1848 | int gbprox_cleanup_peers(uint16_t nsei, uint16_t bvci) |
Jacob Erlbeck | 4211d79 | 2013-10-24 12:48:23 +0200 | [diff] [blame] | 1849 | { |
| 1850 | int counter = 0; |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 1851 | struct gbproxy_peer *peer, *tmp; |
Jacob Erlbeck | 4211d79 | 2013-10-24 12:48:23 +0200 | [diff] [blame] | 1852 | |
Holger Hans Peter Freyther | 18739ea | 2014-08-04 11:10:09 +0200 | [diff] [blame] | 1853 | llist_for_each_entry_safe(peer, tmp, &gbcfg.bts_peers, list) { |
Jacob Erlbeck | 4211d79 | 2013-10-24 12:48:23 +0200 | [diff] [blame] | 1854 | if (peer->nsei != nsei) |
| 1855 | continue; |
| 1856 | if (bvci && peer->bvci != bvci) |
| 1857 | continue; |
| 1858 | |
| 1859 | peer_free(peer); |
| 1860 | counter += 1; |
| 1861 | } |
| 1862 | |
| 1863 | return counter; |
| 1864 | } |
| 1865 | |
Holger Hans Peter Freyther | 18739ea | 2014-08-04 11:10:09 +0200 | [diff] [blame] | 1866 | int gbproxy_init_config(struct gbproxy_config *cfg) |
Jacob Erlbeck | 4211d79 | 2013-10-24 12:48:23 +0200 | [diff] [blame] | 1867 | { |
Holger Hans Peter Freyther | 18739ea | 2014-08-04 11:10:09 +0200 | [diff] [blame] | 1868 | INIT_LLIST_HEAD(&cfg->bts_peers); |
Holger Hans Peter Freyther | a7027a0 | 2014-08-04 11:19:56 +0200 | [diff] [blame] | 1869 | cfg->ctrg = rate_ctr_group_alloc(tall_bsc_ctx, &global_ctrg_desc, 0); |
Holger Hans Peter Freyther | 18739ea | 2014-08-04 11:10:09 +0200 | [diff] [blame] | 1870 | return 0; |
Jacob Erlbeck | 4211d79 | 2013-10-24 12:48:23 +0200 | [diff] [blame] | 1871 | } |