Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 1 | /* MTP layer3 main handling code */ |
| 2 | /* |
| 3 | * (C) 2010 by Holger Hans Peter Freyther <zecke@selfish.org> |
| 4 | * (C) 2010 by On-Waves |
| 5 | * All Rights Reserved |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License along |
| 18 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 19 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | */ |
| 22 | #include <mtp_data.h> |
| 23 | #include <mtp_level3.h> |
Holger Hans Peter Freyther | cbf7d18 | 2010-07-31 05:25:35 +0800 | [diff] [blame] | 24 | #include <cellmgr_debug.h> |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 25 | |
Holger Hans Peter Freyther | cbf7d18 | 2010-07-31 05:25:35 +0800 | [diff] [blame] | 26 | #include <osmocore/talloc.h> |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 27 | |
Holger Hans Peter Freyther | cf381e2 | 2010-08-04 18:39:26 +0800 | [diff] [blame] | 28 | #include <osmocom/sccp/sccp.h> |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 29 | |
| 30 | #include <arpa/inet.h> |
| 31 | |
| 32 | #include <string.h> |
| 33 | |
| 34 | static void *tall_mtp_ctx = NULL; |
| 35 | |
| 36 | static struct msgb *mtp_msg_alloc(struct mtp_link *link) |
| 37 | { |
| 38 | struct mtp_level_3_hdr *hdr; |
| 39 | struct msgb *msg = msgb_alloc_headroom(4096, 128, "mtp-msg"); |
| 40 | if (!msg) { |
| 41 | LOGP(DINP, LOGL_ERROR, "Failed to allocate mtp msg\n"); |
| 42 | return NULL; |
| 43 | } |
| 44 | |
| 45 | msg->l2h = msgb_put(msg, sizeof(*hdr)); |
| 46 | hdr = (struct mtp_level_3_hdr *) msg->l2h; |
| 47 | hdr->addr = MTP_ADDR(0x0, link->dpc, link->opc); |
Holger Hans Peter Freyther | 4e3e28e | 2010-11-26 21:05:39 +0100 | [diff] [blame] | 48 | hdr->ni = link->ni; |
Holger Hans Peter Freyther | e976df1 | 2010-11-26 21:07:11 +0100 | [diff] [blame] | 49 | hdr->spare = link->spare; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 50 | return msg; |
| 51 | } |
| 52 | |
| 53 | static struct msgb *mtp_create_sltm(struct mtp_link *link) |
| 54 | { |
Holger Hans Peter Freyther | 5aa1701 | 2010-07-31 04:37:26 +0800 | [diff] [blame] | 55 | const uint8_t test_ptrn[14] = { 'G', 'S', 'M', 'M', 'M', 'S', }; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 56 | struct mtp_level_3_hdr *hdr; |
| 57 | struct mtp_level_3_mng *mng; |
| 58 | struct msgb *msg = mtp_msg_alloc(link); |
Holger Hans Peter Freyther | 5aa1701 | 2010-07-31 04:37:26 +0800 | [diff] [blame] | 59 | uint8_t *data; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 60 | if (!msg) |
| 61 | return NULL; |
| 62 | |
| 63 | hdr = (struct mtp_level_3_hdr *) msg->l2h; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 64 | hdr->ser_ind = MTP_SI_MNT_REG_MSG; |
| 65 | |
| 66 | mng = (struct mtp_level_3_mng *) msgb_put(msg, sizeof(*mng)); |
| 67 | mng->cmn.h0 = MTP_TST_MSG_GRP; |
| 68 | mng->cmn.h1 = MTP_TST_MSG_SLTM; |
| 69 | mng->length = ARRAY_SIZE(test_ptrn); |
| 70 | |
| 71 | data = msgb_put(msg, ARRAY_SIZE(test_ptrn)); |
| 72 | memcpy(data, test_ptrn, ARRAY_SIZE(test_ptrn)); |
| 73 | |
| 74 | /* remember the last tst ptrn... once we have some */ |
| 75 | memcpy(link->test_ptrn, test_ptrn, ARRAY_SIZE(test_ptrn)); |
| 76 | |
| 77 | return msg; |
| 78 | } |
| 79 | |
| 80 | static struct msgb *mtp_create_slta(struct mtp_link *link, struct mtp_level_3_mng *in_mng, int l3_len) |
| 81 | { |
| 82 | struct mtp_level_3_hdr *hdr; |
| 83 | struct mtp_level_3_mng *mng; |
| 84 | struct msgb *out = mtp_msg_alloc(link); |
| 85 | |
| 86 | if (!out) |
| 87 | return NULL; |
| 88 | |
| 89 | hdr = (struct mtp_level_3_hdr *) out->l2h; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 90 | hdr->ser_ind = MTP_SI_MNT_REG_MSG; |
| 91 | mng = (struct mtp_level_3_mng *) msgb_put(out, sizeof(*mng)); |
| 92 | mng->cmn.h0 = MTP_TST_MSG_GRP; |
| 93 | mng->cmn.h1 = MTP_TST_MSG_SLTA; |
| 94 | mng->length = l3_len - 2; |
| 95 | msgb_put(out, mng->length); |
| 96 | memcpy(mng->data, in_mng->data, mng->length); |
| 97 | |
| 98 | return out; |
| 99 | } |
| 100 | |
| 101 | static struct msgb *mtp_tfp_alloc(struct mtp_link *link, int apoc) |
| 102 | { |
| 103 | struct mtp_level_3_hdr *hdr; |
| 104 | struct mtp_level_3_prohib *prb; |
| 105 | struct msgb *out = mtp_msg_alloc(link); |
| 106 | |
| 107 | if (!out) |
| 108 | return NULL; |
| 109 | |
| 110 | hdr = (struct mtp_level_3_hdr *) out->l2h; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 111 | hdr->ser_ind = MTP_SI_MNT_SNM_MSG; |
| 112 | prb = (struct mtp_level_3_prohib *) msgb_put(out, sizeof(*prb)); |
| 113 | prb->cmn.h0 = MTP_PROHIBIT_MSG_GRP; |
| 114 | prb->cmn.h1 = MTP_PROHIBIT_MSG_SIG; |
| 115 | prb->apoc = MTP_MAKE_APOC(apoc); |
| 116 | return out; |
| 117 | } |
| 118 | |
| 119 | static struct msgb *mtp_tra_alloc(struct mtp_link *link) |
| 120 | { |
| 121 | struct mtp_level_3_hdr *hdr; |
| 122 | struct mtp_level_3_cmn *cmn; |
| 123 | struct msgb *out = mtp_msg_alloc(link); |
| 124 | |
| 125 | if (!out) |
| 126 | return NULL; |
| 127 | |
| 128 | hdr = (struct mtp_level_3_hdr *) out->l2h; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 129 | hdr->ser_ind = MTP_SI_MNT_SNM_MSG; |
| 130 | cmn = (struct mtp_level_3_cmn *) msgb_put(out, sizeof(*cmn)); |
| 131 | cmn->h0 = MTP_TRF_RESTR_MSG_GRP; |
| 132 | cmn->h1 = MTP_RESTR_MSG_ALLWED; |
| 133 | return out; |
| 134 | } |
| 135 | |
| 136 | static struct msgb *mtp_sccp_alloc_ssa(struct mtp_link *link, int sls) |
| 137 | { |
| 138 | struct sccp_data_unitdata *udt; |
| 139 | struct sccp_con_ctrl_prt_mgt *prt; |
| 140 | struct mtp_level_3_hdr *hdr; |
Holger Hans Peter Freyther | 5aa1701 | 2010-07-31 04:37:26 +0800 | [diff] [blame] | 141 | uint8_t *data; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 142 | |
| 143 | |
| 144 | struct msgb *out = mtp_msg_alloc(link); |
| 145 | |
| 146 | if (!out) |
| 147 | return NULL; |
| 148 | |
| 149 | hdr = (struct mtp_level_3_hdr *) out->l2h; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 150 | hdr->ser_ind = MTP_SI_MNT_SCCP; |
| 151 | |
| 152 | /* this appears to be round robin or such.. */ |
| 153 | hdr->addr = MTP_ADDR(sls % 16, link->dpc, link->opc); |
| 154 | |
| 155 | /* generate the UDT message... libsccp does not offer formating yet */ |
| 156 | udt = (struct sccp_data_unitdata *) msgb_put(out, sizeof(*udt)); |
| 157 | udt->type = SCCP_MSG_TYPE_UDT; |
| 158 | udt->proto_class = SCCP_PROTOCOL_CLASS_0; |
| 159 | udt->variable_called = 3; |
| 160 | udt->variable_calling = 5; |
| 161 | udt->variable_data = 7; |
| 162 | |
| 163 | /* put the called and calling address. It is LV */ |
| 164 | data = msgb_put(out, 2 + 1); |
| 165 | data[0] = 2; |
| 166 | data[1] = 0x42; |
| 167 | data[2] = 0x1; |
| 168 | |
| 169 | data = msgb_put(out, 2 + 1); |
| 170 | data[0] = 2; |
| 171 | data[1] = 0x42; |
| 172 | data[2] = 0x1; |
| 173 | |
| 174 | data = msgb_put(out, 1); |
| 175 | data[0] = sizeof(*prt); |
| 176 | |
| 177 | prt = (struct sccp_con_ctrl_prt_mgt *) msgb_put(out, sizeof(*prt)); |
| 178 | prt->sst = SCCP_SSA; |
| 179 | prt->assn = 254; |
| 180 | prt->apoc = MTP_MAKE_APOC(link->opc); |
| 181 | prt->mul_ind = 0; |
| 182 | |
| 183 | return out; |
| 184 | } |
| 185 | |
| 186 | void mtp_link_init(void) |
| 187 | { |
| 188 | tall_mtp_ctx = talloc_named_const(NULL, 1, "mtp-link"); |
| 189 | } |
| 190 | |
| 191 | static void mtp_send_sltm(struct mtp_link *link) |
| 192 | { |
| 193 | struct msgb *msg; |
| 194 | |
| 195 | link->sltm_pending = 1; |
| 196 | msg = mtp_create_sltm(link); |
| 197 | if (!msg) { |
| 198 | LOGP(DINP, LOGL_ERROR, "Failed to allocate SLTM.\n"); |
| 199 | return; |
| 200 | } |
| 201 | |
| 202 | mtp_link_submit(link, msg); |
| 203 | } |
| 204 | |
| 205 | static void mtp_sltm_t1_timeout(void *_link) |
| 206 | { |
| 207 | struct mtp_link *link = (struct mtp_link *) _link; |
| 208 | |
| 209 | if (link->slta_misses == 0) { |
| 210 | LOGP(DINP, LOGL_ERROR, "No SLTM response. Retrying. Link: %p\n", link); |
| 211 | ++link->slta_misses; |
| 212 | mtp_send_sltm(link); |
| 213 | bsc_schedule_timer(&link->t1_timer, MTP_T1); |
| 214 | } else { |
| 215 | LOGP(DINP, LOGL_ERROR, "Two missing SLTAs. Restart link: %p\n", link); |
| 216 | link->sccp_up = 0; |
| 217 | link->running = 0; |
| 218 | bsc_del_timer(&link->t2_timer); |
| 219 | mtp_link_sccp_down(link); |
| 220 | mtp_link_restart(link); |
| 221 | } |
| 222 | } |
| 223 | |
| 224 | static void mtp_sltm_t2_timeout(void *_link) |
| 225 | { |
| 226 | struct mtp_link *link = (struct mtp_link *) _link; |
| 227 | |
| 228 | if (!link->running) { |
| 229 | LOGP(DINP, LOGL_INFO, "Not restarting SLTM timer on link: %p\n", link); |
| 230 | return; |
| 231 | } |
| 232 | |
| 233 | link->slta_misses = 0; |
| 234 | mtp_send_sltm(link); |
| 235 | |
| 236 | bsc_schedule_timer(&link->t1_timer, MTP_T1); |
| 237 | |
| 238 | if (link->sltm_once && link->was_up) |
| 239 | LOGP(DINP, LOGL_INFO, "Not sending SLTM again as configured.\n"); |
| 240 | else |
| 241 | bsc_schedule_timer(&link->t2_timer, MTP_T2); |
| 242 | } |
| 243 | |
| 244 | static void mtp_delayed_start(void *link) |
| 245 | { |
| 246 | mtp_sltm_t2_timeout(link); |
| 247 | } |
| 248 | |
| 249 | struct mtp_link *mtp_link_alloc(void) |
| 250 | { |
| 251 | struct mtp_link *link; |
| 252 | |
| 253 | link = talloc_zero(tall_mtp_ctx, struct mtp_link); |
| 254 | if (!link) |
| 255 | return NULL; |
| 256 | |
Holger Hans Peter Freyther | 4e3e28e | 2010-11-26 21:05:39 +0100 | [diff] [blame] | 257 | link->ni = MTP_NI_NATION_NET; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 258 | link->t1_timer.data = link; |
| 259 | link->t1_timer.cb = mtp_sltm_t1_timeout; |
| 260 | link->t2_timer.data = link; |
| 261 | link->t2_timer.cb = mtp_sltm_t2_timeout; |
| 262 | link->delay_timer.data = link; |
| 263 | link->delay_timer.cb = mtp_delayed_start; |
| 264 | INIT_LLIST_HEAD(&link->pending_msgs); |
| 265 | return link; |
| 266 | } |
| 267 | |
| 268 | void mtp_link_stop(struct mtp_link *link) |
| 269 | { |
| 270 | bsc_del_timer(&link->t1_timer); |
| 271 | bsc_del_timer(&link->t2_timer); |
| 272 | bsc_del_timer(&link->delay_timer); |
| 273 | link->sccp_up = 0; |
| 274 | link->running = 0; |
| 275 | link->sltm_pending = 0; |
| 276 | |
| 277 | mtp_link_sccp_down(link); |
| 278 | } |
| 279 | |
| 280 | void mtp_link_reset(struct mtp_link *link) |
| 281 | { |
| 282 | mtp_link_stop(link); |
| 283 | link->running = 1; |
| 284 | bsc_schedule_timer(&link->delay_timer, START_DELAY); |
| 285 | } |
| 286 | |
| 287 | static int mtp_link_sign_msg(struct mtp_link *link, struct mtp_level_3_hdr *hdr, int l3_len) |
| 288 | { |
| 289 | struct msgb *msg; |
| 290 | struct mtp_level_3_cmn *cmn; |
Holger Hans Peter Freyther | ae74181 | 2010-12-08 11:28:12 +0100 | [diff] [blame] | 291 | uint16_t *apc; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 292 | |
Holger Hans Peter Freyther | 4e3e28e | 2010-11-26 21:05:39 +0100 | [diff] [blame] | 293 | if (hdr->ni != link->ni || l3_len < 1) { |
Holger Hans Peter Freyther | dedb7ce | 2010-10-08 17:49:24 +0800 | [diff] [blame] | 294 | LOGP(DINP, LOGL_ERROR, "Unhandled data (ni: %d len: %d)\n", |
| 295 | hdr->ni, l3_len); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 296 | return -1; |
| 297 | } |
| 298 | |
| 299 | cmn = (struct mtp_level_3_cmn *) &hdr->data[0]; |
| 300 | LOGP(DINP, LOGL_DEBUG, "reg msg: h0: 0x%x h1: 0x%x\n", |
| 301 | cmn->h0, cmn->h1); |
| 302 | |
| 303 | switch (cmn->h0) { |
| 304 | case MTP_TRF_RESTR_MSG_GRP: |
| 305 | switch (cmn->h1) { |
| 306 | case MTP_RESTR_MSG_ALLWED: |
| 307 | LOGP(DINP, LOGL_INFO, "Received Restart Allowed. SST should be next: %p\n", link); |
| 308 | link->sccp_up = 0; |
| 309 | mtp_link_sccp_down(link); |
| 310 | |
| 311 | msg = mtp_tfp_alloc(link, 0); |
| 312 | if (!msg) |
| 313 | return -1; |
| 314 | mtp_link_submit(link, msg); |
| 315 | |
| 316 | msg = mtp_tra_alloc(link); |
| 317 | if (!msg) |
| 318 | return -1; |
| 319 | |
| 320 | mtp_link_submit(link, msg); |
| 321 | return 0; |
| 322 | break; |
| 323 | } |
| 324 | break; |
Holger Hans Peter Freyther | ae74181 | 2010-12-08 11:28:12 +0100 | [diff] [blame] | 325 | case MTP_PROHIBIT_MSG_GRP: |
| 326 | switch (cmn->h1) { |
| 327 | case MTP_PROHIBIT_MSG_SIG: |
| 328 | if (l3_len < 3) { |
| 329 | LOGP(DINP, LOGL_ERROR, "TFP is too short.\n"); |
| 330 | return -1; |
| 331 | } |
| 332 | |
| 333 | apc = (uint16_t *) &hdr->data[1]; |
| 334 | LOGP(DINP, LOGL_INFO, |
| 335 | "TFP for the affected point code: %d\n", *apc); |
| 336 | return 0; |
| 337 | break; |
| 338 | } |
| 339 | break; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 340 | } |
| 341 | |
Holger Hans Peter Freyther | 1291ce5 | 2010-12-08 11:10:34 +0100 | [diff] [blame] | 342 | LOGP(DINP, LOGL_ERROR, "Unknown message:%d/%d %s\n", cmn->h0, cmn->h1, hexdump(&hdr->data[0], l3_len)); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 343 | return -1; |
| 344 | } |
| 345 | |
| 346 | static int mtp_link_regular_msg(struct mtp_link *link, struct mtp_level_3_hdr *hdr, int l3_len) |
| 347 | { |
| 348 | struct msgb *out; |
| 349 | struct mtp_level_3_mng *mng; |
| 350 | |
Holger Hans Peter Freyther | 4e3e28e | 2010-11-26 21:05:39 +0100 | [diff] [blame] | 351 | if (hdr->ni != link->ni || l3_len < 1) { |
Holger Hans Peter Freyther | dedb7ce | 2010-10-08 17:49:24 +0800 | [diff] [blame] | 352 | LOGP(DINP, LOGL_ERROR, "Unhandled data (ni: %d len: %d)\n", |
| 353 | hdr->ni, l3_len); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 354 | return -1; |
| 355 | } |
| 356 | |
| 357 | mng = (struct mtp_level_3_mng *) &hdr->data[0]; |
| 358 | LOGP(DINP, LOGL_DEBUG, "reg msg: h0: 0x%x h1: 0x%x\n", |
| 359 | mng->cmn.h0, mng->cmn.h1); |
| 360 | |
| 361 | switch (mng->cmn.h0) { |
| 362 | case MTP_TST_MSG_GRP: |
| 363 | switch (mng->cmn.h1) { |
| 364 | case MTP_TST_MSG_SLTM: |
| 365 | /* simply respond to the request... */ |
| 366 | out = mtp_create_slta(link, mng, l3_len); |
| 367 | if (!out) |
| 368 | return -1; |
| 369 | mtp_link_submit(link, out); |
| 370 | return 0; |
| 371 | break; |
| 372 | case MTP_TST_MSG_SLTA: |
| 373 | if (mng->length != 14) { |
| 374 | LOGP(DINP, LOGL_ERROR, "Wrongly sized SLTA: %u\n", mng->length); |
| 375 | return -1; |
| 376 | } |
| 377 | |
| 378 | if (l3_len != 16) { |
| 379 | LOGP(DINP, LOGL_ERROR, "Wrongly sized SLTA: %u\n", mng->length); |
| 380 | return -1; |
| 381 | } |
| 382 | |
| 383 | if (memcmp(mng->data, link->test_ptrn, sizeof(link->test_ptrn)) != 0) { |
| 384 | LOGP(DINP, LOGL_ERROR, "Wrong test pattern SLTA\n"); |
| 385 | return -1; |
| 386 | } |
| 387 | |
| 388 | /* we had a matching slta */ |
| 389 | bsc_del_timer(&link->t1_timer); |
| 390 | link->sltm_pending = 0; |
| 391 | mtp_link_slta_recv(link); |
| 392 | return 0; |
| 393 | break; |
| 394 | } |
| 395 | break; |
| 396 | } |
| 397 | |
| 398 | return -1; |
| 399 | } |
| 400 | |
| 401 | static int mtp_link_sccp_data(struct mtp_link *link, struct mtp_level_3_hdr *hdr, struct msgb *msg, int l3_len) |
| 402 | { |
| 403 | struct msgb *out; |
| 404 | struct sccp_con_ctrl_prt_mgt *prt; |
| 405 | |
| 406 | msg->l2h = &hdr->data[0]; |
| 407 | if (msgb_l2len(msg) != l3_len) { |
| 408 | LOGP(DINP, LOGL_ERROR, "Size is wrong after playing with the l2h header.\n"); |
| 409 | return -1; |
| 410 | } |
| 411 | |
| 412 | |
| 413 | if (link->sccp_up) { |
| 414 | mtp_link_forward_sccp(link, msg, MTP_LINK_SLS(hdr->addr)); |
| 415 | return 0; |
| 416 | } else { |
| 417 | struct sccp_parse_result sccp; |
| 418 | memset(&sccp, 0, sizeof(sccp)); |
| 419 | if (sccp_parse_header(msg, &sccp) != 0) { |
| 420 | LOGP(DINP, LOGL_ERROR, "Failed to parsed SCCP header.\n"); |
| 421 | return -1; |
| 422 | } |
| 423 | |
| 424 | if (sccp_determine_msg_type(msg) != SCCP_MSG_TYPE_UDT) { |
| 425 | LOGP(DINP, LOGL_ERROR, "Dropping sccp data: 0x%x\n", |
| 426 | sccp_determine_msg_type(msg)); |
| 427 | return -1; |
| 428 | } |
| 429 | |
| 430 | if (msgb_l3len(msg) != 5) { |
| 431 | LOGP(DINP, LOGL_ERROR, "SCCP UDT msg of unexpected size: %u\n", |
| 432 | msgb_l3len(msg)); |
| 433 | return -1; |
| 434 | } |
| 435 | |
| 436 | if (msg->l3h[0] != SCCP_SST) { |
| 437 | LOGP(DINP, LOGL_ERROR, "Expected SCCP SST but got 0x%x\n", |
| 438 | msg->l3h[0]); |
| 439 | return -1; |
| 440 | } |
| 441 | |
| 442 | prt = (struct sccp_con_ctrl_prt_mgt *) &msg->l3h[0]; |
| 443 | if (prt->assn != 254 || prt->apoc != MTP_MAKE_APOC(link->opc)) { |
| 444 | LOGP(DINP, LOGL_ERROR, "Unknown SSN/APOC assn: %u, apoc: %u/%u\n", |
| 445 | prt->assn, ntohs(prt->apoc), prt->apoc); |
| 446 | return -1; |
| 447 | } |
| 448 | |
| 449 | out = mtp_sccp_alloc_ssa(link, MTP_LINK_SLS(hdr->addr)); |
| 450 | if (!out) |
| 451 | return -1; |
| 452 | |
| 453 | link->sccp_up = 1; |
| 454 | link->was_up = 1; |
| 455 | LOGP(DINP, LOGL_INFO, "SCCP is established. %p\n", link); |
| 456 | mtp_link_submit(link, out); |
| 457 | } |
| 458 | return 0; |
| 459 | } |
| 460 | |
| 461 | int mtp_link_data(struct mtp_link *link, struct msgb *msg) |
| 462 | { |
| 463 | int rc = -1; |
| 464 | struct mtp_level_3_hdr *hdr; |
| 465 | int l3_len; |
| 466 | |
| 467 | if (!msg->l2h || msgb_l2len(msg) < sizeof(*hdr)) |
| 468 | return -1; |
| 469 | |
| 470 | if (!link->running) { |
| 471 | LOGP(DINP, LOGL_ERROR, "Link is not running. Call mtp_link_reset first: %p\n", link); |
| 472 | return -1; |
| 473 | } |
| 474 | |
| 475 | hdr = (struct mtp_level_3_hdr *) msg->l2h; |
| 476 | l3_len = msgb_l2len(msg) - sizeof(*hdr); |
| 477 | |
| 478 | switch (hdr->ser_ind) { |
| 479 | case MTP_SI_MNT_SNM_MSG: |
| 480 | rc = mtp_link_sign_msg(link, hdr, l3_len); |
| 481 | break; |
| 482 | case MTP_SI_MNT_REG_MSG: |
| 483 | rc = mtp_link_regular_msg(link, hdr, l3_len); |
| 484 | break; |
| 485 | case MTP_SI_MNT_SCCP: |
| 486 | rc = mtp_link_sccp_data(link, hdr, msg, l3_len); |
| 487 | break; |
Holger Hans Peter Freyther | 3a80cb2 | 2010-12-08 11:12:46 +0100 | [diff] [blame] | 488 | case MTP_SI_MNT_ISUP: |
| 489 | LOGP(DINP, LOGL_ERROR, "ISUP handling not implemented.\n"); |
| 490 | break; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 491 | default: |
| 492 | fprintf(stderr, "Unhandled: %u\n", hdr->ser_ind); |
| 493 | break; |
| 494 | } |
| 495 | |
| 496 | return rc; |
| 497 | } |
| 498 | |
Holger Hans Peter Freyther | 5aa1701 | 2010-07-31 04:37:26 +0800 | [diff] [blame] | 499 | int mtp_link_submit_sccp_data(struct mtp_link *link, int sls, const uint8_t *data, unsigned int length) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 500 | { |
Holger Hans Peter Freyther | 5aa1701 | 2010-07-31 04:37:26 +0800 | [diff] [blame] | 501 | uint8_t *put_ptr; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 502 | struct mtp_level_3_hdr *hdr; |
| 503 | struct msgb *msg; |
| 504 | |
| 505 | if (!link->sccp_up) { |
| 506 | LOGP(DINP, LOGL_ERROR, "SCCP msg after TRA and before SSA. Dropping it.\n"); |
| 507 | return -1; |
| 508 | } |
| 509 | |
| 510 | msg = mtp_msg_alloc(link); |
| 511 | if (!msg) |
| 512 | return -1; |
| 513 | |
| 514 | hdr = (struct mtp_level_3_hdr *) msg->l2h; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 515 | hdr->ser_ind = MTP_SI_MNT_SCCP; |
| 516 | |
| 517 | hdr->addr = MTP_ADDR(sls % 16, link->dpc, link->opc); |
| 518 | |
| 519 | /* copy the raw sccp data */ |
| 520 | put_ptr = msgb_put(msg, length); |
| 521 | memcpy(put_ptr, data, length); |
| 522 | |
| 523 | mtp_link_submit(link, msg); |
| 524 | return 0; |
| 525 | } |