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); |
| 48 | return msg; |
| 49 | } |
| 50 | |
| 51 | static struct msgb *mtp_create_sltm(struct mtp_link *link) |
| 52 | { |
Holger Hans Peter Freyther | 5aa1701 | 2010-07-31 04:37:26 +0800 | [diff] [blame] | 53 | 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] | 54 | struct mtp_level_3_hdr *hdr; |
| 55 | struct mtp_level_3_mng *mng; |
| 56 | struct msgb *msg = mtp_msg_alloc(link); |
Holger Hans Peter Freyther | 5aa1701 | 2010-07-31 04:37:26 +0800 | [diff] [blame] | 57 | uint8_t *data; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 58 | if (!msg) |
| 59 | return NULL; |
| 60 | |
| 61 | hdr = (struct mtp_level_3_hdr *) msg->l2h; |
| 62 | hdr->ni = MTP_NI_NATION_NET; |
| 63 | hdr->ser_ind = MTP_SI_MNT_REG_MSG; |
| 64 | |
| 65 | mng = (struct mtp_level_3_mng *) msgb_put(msg, sizeof(*mng)); |
| 66 | mng->cmn.h0 = MTP_TST_MSG_GRP; |
| 67 | mng->cmn.h1 = MTP_TST_MSG_SLTM; |
| 68 | mng->length = ARRAY_SIZE(test_ptrn); |
| 69 | |
| 70 | data = msgb_put(msg, ARRAY_SIZE(test_ptrn)); |
| 71 | memcpy(data, test_ptrn, ARRAY_SIZE(test_ptrn)); |
| 72 | |
| 73 | /* remember the last tst ptrn... once we have some */ |
| 74 | memcpy(link->test_ptrn, test_ptrn, ARRAY_SIZE(test_ptrn)); |
| 75 | |
| 76 | return msg; |
| 77 | } |
| 78 | |
| 79 | static struct msgb *mtp_create_slta(struct mtp_link *link, struct mtp_level_3_mng *in_mng, int l3_len) |
| 80 | { |
| 81 | struct mtp_level_3_hdr *hdr; |
| 82 | struct mtp_level_3_mng *mng; |
| 83 | struct msgb *out = mtp_msg_alloc(link); |
| 84 | |
| 85 | if (!out) |
| 86 | return NULL; |
| 87 | |
| 88 | hdr = (struct mtp_level_3_hdr *) out->l2h; |
| 89 | hdr->ni = MTP_NI_NATION_NET; |
| 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; |
| 111 | hdr->ni = MTP_NI_NATION_NET; |
| 112 | hdr->ser_ind = MTP_SI_MNT_SNM_MSG; |
| 113 | prb = (struct mtp_level_3_prohib *) msgb_put(out, sizeof(*prb)); |
| 114 | prb->cmn.h0 = MTP_PROHIBIT_MSG_GRP; |
| 115 | prb->cmn.h1 = MTP_PROHIBIT_MSG_SIG; |
| 116 | prb->apoc = MTP_MAKE_APOC(apoc); |
| 117 | return out; |
| 118 | } |
| 119 | |
| 120 | static struct msgb *mtp_tra_alloc(struct mtp_link *link) |
| 121 | { |
| 122 | struct mtp_level_3_hdr *hdr; |
| 123 | struct mtp_level_3_cmn *cmn; |
| 124 | struct msgb *out = mtp_msg_alloc(link); |
| 125 | |
| 126 | if (!out) |
| 127 | return NULL; |
| 128 | |
| 129 | hdr = (struct mtp_level_3_hdr *) out->l2h; |
| 130 | hdr->ni = MTP_NI_NATION_NET; |
| 131 | hdr->ser_ind = MTP_SI_MNT_SNM_MSG; |
| 132 | cmn = (struct mtp_level_3_cmn *) msgb_put(out, sizeof(*cmn)); |
| 133 | cmn->h0 = MTP_TRF_RESTR_MSG_GRP; |
| 134 | cmn->h1 = MTP_RESTR_MSG_ALLWED; |
| 135 | return out; |
| 136 | } |
| 137 | |
| 138 | static struct msgb *mtp_sccp_alloc_ssa(struct mtp_link *link, int sls) |
| 139 | { |
| 140 | struct sccp_data_unitdata *udt; |
| 141 | struct sccp_con_ctrl_prt_mgt *prt; |
| 142 | struct mtp_level_3_hdr *hdr; |
Holger Hans Peter Freyther | 5aa1701 | 2010-07-31 04:37:26 +0800 | [diff] [blame] | 143 | uint8_t *data; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 144 | |
| 145 | |
| 146 | struct msgb *out = mtp_msg_alloc(link); |
| 147 | |
| 148 | if (!out) |
| 149 | return NULL; |
| 150 | |
| 151 | hdr = (struct mtp_level_3_hdr *) out->l2h; |
| 152 | hdr->ni = MTP_NI_NATION_NET; |
| 153 | hdr->ser_ind = MTP_SI_MNT_SCCP; |
| 154 | |
| 155 | /* this appears to be round robin or such.. */ |
| 156 | hdr->addr = MTP_ADDR(sls % 16, link->dpc, link->opc); |
| 157 | |
| 158 | /* generate the UDT message... libsccp does not offer formating yet */ |
| 159 | udt = (struct sccp_data_unitdata *) msgb_put(out, sizeof(*udt)); |
| 160 | udt->type = SCCP_MSG_TYPE_UDT; |
| 161 | udt->proto_class = SCCP_PROTOCOL_CLASS_0; |
| 162 | udt->variable_called = 3; |
| 163 | udt->variable_calling = 5; |
| 164 | udt->variable_data = 7; |
| 165 | |
| 166 | /* put the called and calling address. It is LV */ |
| 167 | data = msgb_put(out, 2 + 1); |
| 168 | data[0] = 2; |
| 169 | data[1] = 0x42; |
| 170 | data[2] = 0x1; |
| 171 | |
| 172 | data = msgb_put(out, 2 + 1); |
| 173 | data[0] = 2; |
| 174 | data[1] = 0x42; |
| 175 | data[2] = 0x1; |
| 176 | |
| 177 | data = msgb_put(out, 1); |
| 178 | data[0] = sizeof(*prt); |
| 179 | |
| 180 | prt = (struct sccp_con_ctrl_prt_mgt *) msgb_put(out, sizeof(*prt)); |
| 181 | prt->sst = SCCP_SSA; |
| 182 | prt->assn = 254; |
| 183 | prt->apoc = MTP_MAKE_APOC(link->opc); |
| 184 | prt->mul_ind = 0; |
| 185 | |
| 186 | return out; |
| 187 | } |
| 188 | |
| 189 | void mtp_link_init(void) |
| 190 | { |
| 191 | tall_mtp_ctx = talloc_named_const(NULL, 1, "mtp-link"); |
| 192 | } |
| 193 | |
| 194 | static void mtp_send_sltm(struct mtp_link *link) |
| 195 | { |
| 196 | struct msgb *msg; |
| 197 | |
| 198 | link->sltm_pending = 1; |
| 199 | msg = mtp_create_sltm(link); |
| 200 | if (!msg) { |
| 201 | LOGP(DINP, LOGL_ERROR, "Failed to allocate SLTM.\n"); |
| 202 | return; |
| 203 | } |
| 204 | |
| 205 | mtp_link_submit(link, msg); |
| 206 | } |
| 207 | |
| 208 | static void mtp_sltm_t1_timeout(void *_link) |
| 209 | { |
| 210 | struct mtp_link *link = (struct mtp_link *) _link; |
| 211 | |
| 212 | if (link->slta_misses == 0) { |
| 213 | LOGP(DINP, LOGL_ERROR, "No SLTM response. Retrying. Link: %p\n", link); |
| 214 | ++link->slta_misses; |
| 215 | mtp_send_sltm(link); |
| 216 | bsc_schedule_timer(&link->t1_timer, MTP_T1); |
| 217 | } else { |
| 218 | LOGP(DINP, LOGL_ERROR, "Two missing SLTAs. Restart link: %p\n", link); |
| 219 | link->sccp_up = 0; |
| 220 | link->running = 0; |
| 221 | bsc_del_timer(&link->t2_timer); |
| 222 | mtp_link_sccp_down(link); |
| 223 | mtp_link_restart(link); |
| 224 | } |
| 225 | } |
| 226 | |
| 227 | static void mtp_sltm_t2_timeout(void *_link) |
| 228 | { |
| 229 | struct mtp_link *link = (struct mtp_link *) _link; |
| 230 | |
| 231 | if (!link->running) { |
| 232 | LOGP(DINP, LOGL_INFO, "Not restarting SLTM timer on link: %p\n", link); |
| 233 | return; |
| 234 | } |
| 235 | |
| 236 | link->slta_misses = 0; |
| 237 | mtp_send_sltm(link); |
| 238 | |
| 239 | bsc_schedule_timer(&link->t1_timer, MTP_T1); |
| 240 | |
| 241 | if (link->sltm_once && link->was_up) |
| 242 | LOGP(DINP, LOGL_INFO, "Not sending SLTM again as configured.\n"); |
| 243 | else |
| 244 | bsc_schedule_timer(&link->t2_timer, MTP_T2); |
| 245 | } |
| 246 | |
| 247 | static void mtp_delayed_start(void *link) |
| 248 | { |
| 249 | mtp_sltm_t2_timeout(link); |
| 250 | } |
| 251 | |
| 252 | struct mtp_link *mtp_link_alloc(void) |
| 253 | { |
| 254 | struct mtp_link *link; |
| 255 | |
| 256 | link = talloc_zero(tall_mtp_ctx, struct mtp_link); |
| 257 | if (!link) |
| 258 | return NULL; |
| 259 | |
| 260 | link->t1_timer.data = link; |
| 261 | link->t1_timer.cb = mtp_sltm_t1_timeout; |
| 262 | link->t2_timer.data = link; |
| 263 | link->t2_timer.cb = mtp_sltm_t2_timeout; |
| 264 | link->delay_timer.data = link; |
| 265 | link->delay_timer.cb = mtp_delayed_start; |
| 266 | INIT_LLIST_HEAD(&link->pending_msgs); |
| 267 | return link; |
| 268 | } |
| 269 | |
| 270 | void mtp_link_stop(struct mtp_link *link) |
| 271 | { |
| 272 | bsc_del_timer(&link->t1_timer); |
| 273 | bsc_del_timer(&link->t2_timer); |
| 274 | bsc_del_timer(&link->delay_timer); |
| 275 | link->sccp_up = 0; |
| 276 | link->running = 0; |
| 277 | link->sltm_pending = 0; |
| 278 | |
| 279 | mtp_link_sccp_down(link); |
| 280 | } |
| 281 | |
| 282 | void mtp_link_reset(struct mtp_link *link) |
| 283 | { |
| 284 | mtp_link_stop(link); |
| 285 | link->running = 1; |
| 286 | bsc_schedule_timer(&link->delay_timer, START_DELAY); |
| 287 | } |
| 288 | |
| 289 | static int mtp_link_sign_msg(struct mtp_link *link, struct mtp_level_3_hdr *hdr, int l3_len) |
| 290 | { |
| 291 | struct msgb *msg; |
| 292 | struct mtp_level_3_cmn *cmn; |
| 293 | |
| 294 | if (hdr->spare != 0 || hdr->ni != MTP_NI_NATION_NET || l3_len < 1) { |
| 295 | LOGP(DINP, LOGL_ERROR, "Unhandled data (%d, %d, %d)\n", |
| 296 | hdr->spare, hdr->ni, l3_len); |
| 297 | return -1; |
| 298 | } |
| 299 | |
| 300 | cmn = (struct mtp_level_3_cmn *) &hdr->data[0]; |
| 301 | LOGP(DINP, LOGL_DEBUG, "reg msg: h0: 0x%x h1: 0x%x\n", |
| 302 | cmn->h0, cmn->h1); |
| 303 | |
| 304 | switch (cmn->h0) { |
| 305 | case MTP_TRF_RESTR_MSG_GRP: |
| 306 | switch (cmn->h1) { |
| 307 | case MTP_RESTR_MSG_ALLWED: |
| 308 | LOGP(DINP, LOGL_INFO, "Received Restart Allowed. SST should be next: %p\n", link); |
| 309 | link->sccp_up = 0; |
| 310 | mtp_link_sccp_down(link); |
| 311 | |
| 312 | msg = mtp_tfp_alloc(link, 0); |
| 313 | if (!msg) |
| 314 | return -1; |
| 315 | mtp_link_submit(link, msg); |
| 316 | |
| 317 | msg = mtp_tra_alloc(link); |
| 318 | if (!msg) |
| 319 | return -1; |
| 320 | |
| 321 | mtp_link_submit(link, msg); |
| 322 | return 0; |
| 323 | break; |
| 324 | } |
| 325 | break; |
| 326 | } |
| 327 | |
| 328 | abort(); |
| 329 | return -1; |
| 330 | } |
| 331 | |
| 332 | static int mtp_link_regular_msg(struct mtp_link *link, struct mtp_level_3_hdr *hdr, int l3_len) |
| 333 | { |
| 334 | struct msgb *out; |
| 335 | struct mtp_level_3_mng *mng; |
| 336 | |
| 337 | if (hdr->spare != 0 || hdr->ni != MTP_NI_NATION_NET || l3_len < 2) { |
| 338 | LOGP(DINP, LOGL_ERROR, "Unhandled data (%d, %d, %d)\n", |
| 339 | hdr->spare, hdr->ni, l3_len); |
| 340 | return -1; |
| 341 | } |
| 342 | |
| 343 | mng = (struct mtp_level_3_mng *) &hdr->data[0]; |
| 344 | LOGP(DINP, LOGL_DEBUG, "reg msg: h0: 0x%x h1: 0x%x\n", |
| 345 | mng->cmn.h0, mng->cmn.h1); |
| 346 | |
| 347 | switch (mng->cmn.h0) { |
| 348 | case MTP_TST_MSG_GRP: |
| 349 | switch (mng->cmn.h1) { |
| 350 | case MTP_TST_MSG_SLTM: |
| 351 | /* simply respond to the request... */ |
| 352 | out = mtp_create_slta(link, mng, l3_len); |
| 353 | if (!out) |
| 354 | return -1; |
| 355 | mtp_link_submit(link, out); |
| 356 | return 0; |
| 357 | break; |
| 358 | case MTP_TST_MSG_SLTA: |
| 359 | if (mng->length != 14) { |
| 360 | LOGP(DINP, LOGL_ERROR, "Wrongly sized SLTA: %u\n", mng->length); |
| 361 | return -1; |
| 362 | } |
| 363 | |
| 364 | if (l3_len != 16) { |
| 365 | LOGP(DINP, LOGL_ERROR, "Wrongly sized SLTA: %u\n", mng->length); |
| 366 | return -1; |
| 367 | } |
| 368 | |
| 369 | if (memcmp(mng->data, link->test_ptrn, sizeof(link->test_ptrn)) != 0) { |
| 370 | LOGP(DINP, LOGL_ERROR, "Wrong test pattern SLTA\n"); |
| 371 | return -1; |
| 372 | } |
| 373 | |
| 374 | /* we had a matching slta */ |
| 375 | bsc_del_timer(&link->t1_timer); |
| 376 | link->sltm_pending = 0; |
| 377 | mtp_link_slta_recv(link); |
| 378 | return 0; |
| 379 | break; |
| 380 | } |
| 381 | break; |
| 382 | } |
| 383 | |
| 384 | return -1; |
| 385 | } |
| 386 | |
| 387 | static int mtp_link_sccp_data(struct mtp_link *link, struct mtp_level_3_hdr *hdr, struct msgb *msg, int l3_len) |
| 388 | { |
| 389 | struct msgb *out; |
| 390 | struct sccp_con_ctrl_prt_mgt *prt; |
| 391 | |
| 392 | msg->l2h = &hdr->data[0]; |
| 393 | if (msgb_l2len(msg) != l3_len) { |
| 394 | LOGP(DINP, LOGL_ERROR, "Size is wrong after playing with the l2h header.\n"); |
| 395 | return -1; |
| 396 | } |
| 397 | |
| 398 | |
| 399 | if (link->sccp_up) { |
| 400 | mtp_link_forward_sccp(link, msg, MTP_LINK_SLS(hdr->addr)); |
| 401 | return 0; |
| 402 | } else { |
| 403 | struct sccp_parse_result sccp; |
| 404 | memset(&sccp, 0, sizeof(sccp)); |
| 405 | if (sccp_parse_header(msg, &sccp) != 0) { |
| 406 | LOGP(DINP, LOGL_ERROR, "Failed to parsed SCCP header.\n"); |
| 407 | return -1; |
| 408 | } |
| 409 | |
| 410 | if (sccp_determine_msg_type(msg) != SCCP_MSG_TYPE_UDT) { |
| 411 | LOGP(DINP, LOGL_ERROR, "Dropping sccp data: 0x%x\n", |
| 412 | sccp_determine_msg_type(msg)); |
| 413 | return -1; |
| 414 | } |
| 415 | |
| 416 | if (msgb_l3len(msg) != 5) { |
| 417 | LOGP(DINP, LOGL_ERROR, "SCCP UDT msg of unexpected size: %u\n", |
| 418 | msgb_l3len(msg)); |
| 419 | return -1; |
| 420 | } |
| 421 | |
| 422 | if (msg->l3h[0] != SCCP_SST) { |
| 423 | LOGP(DINP, LOGL_ERROR, "Expected SCCP SST but got 0x%x\n", |
| 424 | msg->l3h[0]); |
| 425 | return -1; |
| 426 | } |
| 427 | |
| 428 | prt = (struct sccp_con_ctrl_prt_mgt *) &msg->l3h[0]; |
| 429 | if (prt->assn != 254 || prt->apoc != MTP_MAKE_APOC(link->opc)) { |
| 430 | LOGP(DINP, LOGL_ERROR, "Unknown SSN/APOC assn: %u, apoc: %u/%u\n", |
| 431 | prt->assn, ntohs(prt->apoc), prt->apoc); |
| 432 | return -1; |
| 433 | } |
| 434 | |
| 435 | out = mtp_sccp_alloc_ssa(link, MTP_LINK_SLS(hdr->addr)); |
| 436 | if (!out) |
| 437 | return -1; |
| 438 | |
| 439 | link->sccp_up = 1; |
| 440 | link->was_up = 1; |
| 441 | LOGP(DINP, LOGL_INFO, "SCCP is established. %p\n", link); |
| 442 | mtp_link_submit(link, out); |
| 443 | } |
| 444 | return 0; |
| 445 | } |
| 446 | |
| 447 | int mtp_link_data(struct mtp_link *link, struct msgb *msg) |
| 448 | { |
| 449 | int rc = -1; |
| 450 | struct mtp_level_3_hdr *hdr; |
| 451 | int l3_len; |
| 452 | |
| 453 | if (!msg->l2h || msgb_l2len(msg) < sizeof(*hdr)) |
| 454 | return -1; |
| 455 | |
| 456 | if (!link->running) { |
| 457 | LOGP(DINP, LOGL_ERROR, "Link is not running. Call mtp_link_reset first: %p\n", link); |
| 458 | return -1; |
| 459 | } |
| 460 | |
| 461 | hdr = (struct mtp_level_3_hdr *) msg->l2h; |
| 462 | l3_len = msgb_l2len(msg) - sizeof(*hdr); |
| 463 | |
| 464 | switch (hdr->ser_ind) { |
| 465 | case MTP_SI_MNT_SNM_MSG: |
| 466 | rc = mtp_link_sign_msg(link, hdr, l3_len); |
| 467 | break; |
| 468 | case MTP_SI_MNT_REG_MSG: |
| 469 | rc = mtp_link_regular_msg(link, hdr, l3_len); |
| 470 | break; |
| 471 | case MTP_SI_MNT_SCCP: |
| 472 | rc = mtp_link_sccp_data(link, hdr, msg, l3_len); |
| 473 | break; |
| 474 | default: |
| 475 | fprintf(stderr, "Unhandled: %u\n", hdr->ser_ind); |
| 476 | break; |
| 477 | } |
| 478 | |
| 479 | return rc; |
| 480 | } |
| 481 | |
Holger Hans Peter Freyther | 5aa1701 | 2010-07-31 04:37:26 +0800 | [diff] [blame] | 482 | 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] | 483 | { |
Holger Hans Peter Freyther | 5aa1701 | 2010-07-31 04:37:26 +0800 | [diff] [blame] | 484 | uint8_t *put_ptr; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 485 | struct mtp_level_3_hdr *hdr; |
| 486 | struct msgb *msg; |
| 487 | |
| 488 | if (!link->sccp_up) { |
| 489 | LOGP(DINP, LOGL_ERROR, "SCCP msg after TRA and before SSA. Dropping it.\n"); |
| 490 | return -1; |
| 491 | } |
| 492 | |
| 493 | msg = mtp_msg_alloc(link); |
| 494 | if (!msg) |
| 495 | return -1; |
| 496 | |
| 497 | hdr = (struct mtp_level_3_hdr *) msg->l2h; |
| 498 | hdr->ni = MTP_NI_NATION_NET; |
| 499 | hdr->ser_ind = MTP_SI_MNT_SCCP; |
| 500 | |
| 501 | hdr->addr = MTP_ADDR(sls % 16, link->dpc, link->opc); |
| 502 | |
| 503 | /* copy the raw sccp data */ |
| 504 | put_ptr = msgb_put(msg, length); |
| 505 | memcpy(put_ptr, data, length); |
| 506 | |
| 507 | mtp_link_submit(link, msg); |
| 508 | return 0; |
| 509 | } |