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 | * |
Holger Hans Peter Freyther | de56c22 | 2011-01-16 17:45:14 +0100 | [diff] [blame] | 7 | * This program is free software: you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU Affero General Public License as published by |
| 9 | * the Free Software Foundation, either version 3 of the License, or |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 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 |
Holger Hans Peter Freyther | de56c22 | 2011-01-16 17:45:14 +0100 | [diff] [blame] | 15 | * GNU Affero General Public License for more details. |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 16 | * |
Holger Hans Peter Freyther | de56c22 | 2011-01-16 17:45:14 +0100 | [diff] [blame] | 17 | * You should have received a copy of the GNU Affero General Public License |
| 18 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 19 | * |
| 20 | */ |
| 21 | #include <mtp_data.h> |
| 22 | #include <mtp_level3.h> |
Holger Hans Peter Freyther | fe72c16 | 2011-01-04 13:21:52 +0100 | [diff] [blame] | 23 | #include <bsc_data.h> |
Holger Hans Peter Freyther | cbf7d18 | 2010-07-31 05:25:35 +0800 | [diff] [blame] | 24 | #include <cellmgr_debug.h> |
Holger Hans Peter Freyther | 433ea2f | 2010-12-10 07:34:01 +0100 | [diff] [blame] | 25 | #include <isup_types.h> |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 26 | |
Holger Hans Peter Freyther | cbf7d18 | 2010-07-31 05:25:35 +0800 | [diff] [blame] | 27 | #include <osmocore/talloc.h> |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 28 | |
Holger Hans Peter Freyther | cf381e2 | 2010-08-04 18:39:26 +0800 | [diff] [blame] | 29 | #include <osmocom/sccp/sccp.h> |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 30 | |
| 31 | #include <arpa/inet.h> |
| 32 | |
| 33 | #include <string.h> |
| 34 | |
| 35 | static void *tall_mtp_ctx = NULL; |
| 36 | |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 37 | static int mtp_int_submit(struct mtp_link_set *link, int pc, int sls, int type, const uint8_t *data, unsigned int length); |
Holger Hans Peter Freyther | 3aad776 | 2010-12-10 12:18:57 +0100 | [diff] [blame] | 38 | |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 39 | static struct msgb *mtp_msg_alloc(struct mtp_link_set *link) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 40 | { |
| 41 | struct mtp_level_3_hdr *hdr; |
| 42 | struct msgb *msg = msgb_alloc_headroom(4096, 128, "mtp-msg"); |
| 43 | if (!msg) { |
| 44 | LOGP(DINP, LOGL_ERROR, "Failed to allocate mtp msg\n"); |
| 45 | return NULL; |
| 46 | } |
| 47 | |
| 48 | msg->l2h = msgb_put(msg, sizeof(*hdr)); |
| 49 | hdr = (struct mtp_level_3_hdr *) msg->l2h; |
| 50 | hdr->addr = MTP_ADDR(0x0, link->dpc, link->opc); |
Holger Hans Peter Freyther | 4e3e28e | 2010-11-26 21:05:39 +0100 | [diff] [blame] | 51 | hdr->ni = link->ni; |
Holger Hans Peter Freyther | e976df1 | 2010-11-26 21:07:11 +0100 | [diff] [blame] | 52 | hdr->spare = link->spare; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 53 | return msg; |
| 54 | } |
| 55 | |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 56 | static struct msgb *mtp_create_sltm(struct mtp_link_set *link) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 57 | { |
Holger Hans Peter Freyther | 5aa1701 | 2010-07-31 04:37:26 +0800 | [diff] [blame] | 58 | 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] | 59 | struct mtp_level_3_hdr *hdr; |
| 60 | struct mtp_level_3_mng *mng; |
| 61 | struct msgb *msg = mtp_msg_alloc(link); |
Holger Hans Peter Freyther | 5aa1701 | 2010-07-31 04:37:26 +0800 | [diff] [blame] | 62 | uint8_t *data; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 63 | if (!msg) |
| 64 | return NULL; |
| 65 | |
| 66 | hdr = (struct mtp_level_3_hdr *) msg->l2h; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 67 | hdr->ser_ind = MTP_SI_MNT_REG_MSG; |
| 68 | |
| 69 | mng = (struct mtp_level_3_mng *) msgb_put(msg, sizeof(*mng)); |
| 70 | mng->cmn.h0 = MTP_TST_MSG_GRP; |
| 71 | mng->cmn.h1 = MTP_TST_MSG_SLTM; |
| 72 | mng->length = ARRAY_SIZE(test_ptrn); |
| 73 | |
| 74 | data = msgb_put(msg, ARRAY_SIZE(test_ptrn)); |
| 75 | memcpy(data, test_ptrn, ARRAY_SIZE(test_ptrn)); |
| 76 | |
| 77 | /* remember the last tst ptrn... once we have some */ |
| 78 | memcpy(link->test_ptrn, test_ptrn, ARRAY_SIZE(test_ptrn)); |
| 79 | |
| 80 | return msg; |
| 81 | } |
| 82 | |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 83 | static struct msgb *mtp_create_slta(struct mtp_link_set *link, struct mtp_level_3_mng *in_mng, int l3_len) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 84 | { |
| 85 | struct mtp_level_3_hdr *hdr; |
| 86 | struct mtp_level_3_mng *mng; |
| 87 | struct msgb *out = mtp_msg_alloc(link); |
| 88 | |
| 89 | if (!out) |
| 90 | return NULL; |
| 91 | |
| 92 | hdr = (struct mtp_level_3_hdr *) out->l2h; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 93 | hdr->ser_ind = MTP_SI_MNT_REG_MSG; |
| 94 | mng = (struct mtp_level_3_mng *) msgb_put(out, sizeof(*mng)); |
| 95 | mng->cmn.h0 = MTP_TST_MSG_GRP; |
| 96 | mng->cmn.h1 = MTP_TST_MSG_SLTA; |
| 97 | mng->length = l3_len - 2; |
| 98 | msgb_put(out, mng->length); |
| 99 | memcpy(mng->data, in_mng->data, mng->length); |
| 100 | |
| 101 | return out; |
| 102 | } |
| 103 | |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 104 | static struct msgb *mtp_tfp_alloc(struct mtp_link_set *link, int apoc) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 105 | { |
| 106 | struct mtp_level_3_hdr *hdr; |
| 107 | struct mtp_level_3_prohib *prb; |
| 108 | struct msgb *out = mtp_msg_alloc(link); |
| 109 | |
| 110 | if (!out) |
| 111 | return NULL; |
| 112 | |
| 113 | hdr = (struct mtp_level_3_hdr *) out->l2h; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 114 | hdr->ser_ind = MTP_SI_MNT_SNM_MSG; |
| 115 | prb = (struct mtp_level_3_prohib *) msgb_put(out, sizeof(*prb)); |
| 116 | prb->cmn.h0 = MTP_PROHIBIT_MSG_GRP; |
| 117 | prb->cmn.h1 = MTP_PROHIBIT_MSG_SIG; |
| 118 | prb->apoc = MTP_MAKE_APOC(apoc); |
| 119 | return out; |
| 120 | } |
| 121 | |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 122 | static struct msgb *mtp_tra_alloc(struct mtp_link_set *link) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 123 | { |
| 124 | struct mtp_level_3_hdr *hdr; |
| 125 | struct mtp_level_3_cmn *cmn; |
| 126 | struct msgb *out = mtp_msg_alloc(link); |
| 127 | |
| 128 | if (!out) |
| 129 | return NULL; |
| 130 | |
| 131 | hdr = (struct mtp_level_3_hdr *) out->l2h; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 132 | hdr->ser_ind = MTP_SI_MNT_SNM_MSG; |
| 133 | cmn = (struct mtp_level_3_cmn *) msgb_put(out, sizeof(*cmn)); |
| 134 | cmn->h0 = MTP_TRF_RESTR_MSG_GRP; |
| 135 | cmn->h1 = MTP_RESTR_MSG_ALLWED; |
| 136 | return out; |
| 137 | } |
| 138 | |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 139 | static struct msgb *mtp_sccp_alloc_scmg(struct mtp_link_set *link, |
Holger Hans Peter Freyther | 101cd0b | 2011-01-19 10:51:44 +0100 | [diff] [blame^] | 140 | int type, int assn, int apoc, int sls) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 141 | { |
| 142 | struct sccp_data_unitdata *udt; |
| 143 | struct sccp_con_ctrl_prt_mgt *prt; |
| 144 | struct mtp_level_3_hdr *hdr; |
Holger Hans Peter Freyther | 5aa1701 | 2010-07-31 04:37:26 +0800 | [diff] [blame] | 145 | uint8_t *data; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 146 | |
| 147 | |
| 148 | struct msgb *out = mtp_msg_alloc(link); |
| 149 | |
| 150 | if (!out) |
| 151 | return NULL; |
| 152 | |
| 153 | hdr = (struct mtp_level_3_hdr *) out->l2h; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 154 | hdr->ser_ind = MTP_SI_MNT_SCCP; |
| 155 | |
| 156 | /* this appears to be round robin or such.. */ |
Holger Hans Peter Freyther | 7a72556 | 2011-01-01 13:34:58 +0100 | [diff] [blame] | 157 | hdr->addr = MTP_ADDR(sls % 16, link->dpc, link->sccp_opc); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 158 | |
| 159 | /* generate the UDT message... libsccp does not offer formating yet */ |
| 160 | udt = (struct sccp_data_unitdata *) msgb_put(out, sizeof(*udt)); |
| 161 | udt->type = SCCP_MSG_TYPE_UDT; |
| 162 | udt->proto_class = SCCP_PROTOCOL_CLASS_0; |
| 163 | udt->variable_called = 3; |
| 164 | udt->variable_calling = 5; |
| 165 | udt->variable_data = 7; |
| 166 | |
| 167 | /* put the called and calling address. It is LV */ |
| 168 | data = msgb_put(out, 2 + 1); |
| 169 | data[0] = 2; |
| 170 | data[1] = 0x42; |
| 171 | data[2] = 0x1; |
| 172 | |
| 173 | data = msgb_put(out, 2 + 1); |
| 174 | data[0] = 2; |
| 175 | data[1] = 0x42; |
| 176 | data[2] = 0x1; |
| 177 | |
| 178 | data = msgb_put(out, 1); |
| 179 | data[0] = sizeof(*prt); |
| 180 | |
| 181 | prt = (struct sccp_con_ctrl_prt_mgt *) msgb_put(out, sizeof(*prt)); |
Holger Hans Peter Freyther | 80ab4c6 | 2010-12-31 13:40:19 +0100 | [diff] [blame] | 182 | prt->sst = type; |
| 183 | prt->assn = assn; |
Holger Hans Peter Freyther | 101cd0b | 2011-01-19 10:51:44 +0100 | [diff] [blame^] | 184 | prt->apoc = apoc; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 185 | prt->mul_ind = 0; |
| 186 | |
| 187 | return out; |
| 188 | } |
| 189 | |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 190 | void mtp_link_set_init(void) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 191 | { |
| 192 | tall_mtp_ctx = talloc_named_const(NULL, 1, "mtp-link"); |
| 193 | } |
| 194 | |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 195 | static void mtp_send_sltm(struct mtp_link_set *link) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 196 | { |
| 197 | struct msgb *msg; |
| 198 | |
| 199 | link->sltm_pending = 1; |
| 200 | msg = mtp_create_sltm(link); |
| 201 | if (!msg) { |
| 202 | LOGP(DINP, LOGL_ERROR, "Failed to allocate SLTM.\n"); |
| 203 | return; |
| 204 | } |
| 205 | |
Holger Hans Peter Freyther | 069e635 | 2011-01-04 13:01:23 +0100 | [diff] [blame] | 206 | mtp_link_set_submit(link->slc[0], msg); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 207 | } |
| 208 | |
| 209 | static void mtp_sltm_t1_timeout(void *_link) |
| 210 | { |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 211 | struct mtp_link_set *link = (struct mtp_link_set *) _link; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 212 | |
| 213 | if (link->slta_misses == 0) { |
| 214 | LOGP(DINP, LOGL_ERROR, "No SLTM response. Retrying. Link: %p\n", link); |
| 215 | ++link->slta_misses; |
| 216 | mtp_send_sltm(link); |
| 217 | bsc_schedule_timer(&link->t1_timer, MTP_T1); |
| 218 | } else { |
| 219 | LOGP(DINP, LOGL_ERROR, "Two missing SLTAs. Restart link: %p\n", link); |
| 220 | link->sccp_up = 0; |
| 221 | link->running = 0; |
| 222 | bsc_del_timer(&link->t2_timer); |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 223 | mtp_link_set_sccp_down(link); |
Holger Hans Peter Freyther | fe72c16 | 2011-01-04 13:21:52 +0100 | [diff] [blame] | 224 | mtp_link_restart(link->slc[0]); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 225 | } |
| 226 | } |
| 227 | |
| 228 | static void mtp_sltm_t2_timeout(void *_link) |
| 229 | { |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 230 | struct mtp_link_set *link = (struct mtp_link_set *) _link; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 231 | |
| 232 | if (!link->running) { |
| 233 | LOGP(DINP, LOGL_INFO, "Not restarting SLTM timer on link: %p\n", link); |
| 234 | return; |
| 235 | } |
| 236 | |
| 237 | link->slta_misses = 0; |
| 238 | mtp_send_sltm(link); |
| 239 | |
| 240 | bsc_schedule_timer(&link->t1_timer, MTP_T1); |
| 241 | |
| 242 | if (link->sltm_once && link->was_up) |
| 243 | LOGP(DINP, LOGL_INFO, "Not sending SLTM again as configured.\n"); |
| 244 | else |
| 245 | bsc_schedule_timer(&link->t2_timer, MTP_T2); |
| 246 | } |
| 247 | |
| 248 | static void mtp_delayed_start(void *link) |
| 249 | { |
| 250 | mtp_sltm_t2_timeout(link); |
| 251 | } |
| 252 | |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 253 | struct mtp_link_set *mtp_link_set_alloc(void) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 254 | { |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 255 | struct mtp_link_set *link; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 256 | |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 257 | link = talloc_zero(tall_mtp_ctx, struct mtp_link_set); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 258 | if (!link) |
| 259 | return NULL; |
| 260 | |
Holger Hans Peter Freyther | 4e3e28e | 2010-11-26 21:05:39 +0100 | [diff] [blame] | 261 | link->ni = MTP_NI_NATION_NET; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 262 | link->t1_timer.data = link; |
| 263 | link->t1_timer.cb = mtp_sltm_t1_timeout; |
| 264 | link->t2_timer.data = link; |
| 265 | link->t2_timer.cb = mtp_sltm_t2_timeout; |
| 266 | link->delay_timer.data = link; |
| 267 | link->delay_timer.cb = mtp_delayed_start; |
Holger Hans Peter Freyther | fe72c16 | 2011-01-04 13:21:52 +0100 | [diff] [blame] | 268 | INIT_LLIST_HEAD(&link->links); |
| 269 | |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 270 | return link; |
| 271 | } |
| 272 | |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 273 | void mtp_link_set_stop(struct mtp_link_set *link) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 274 | { |
| 275 | bsc_del_timer(&link->t1_timer); |
| 276 | bsc_del_timer(&link->t2_timer); |
| 277 | bsc_del_timer(&link->delay_timer); |
| 278 | link->sccp_up = 0; |
| 279 | link->running = 0; |
| 280 | link->sltm_pending = 0; |
| 281 | |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 282 | mtp_link_set_sccp_down(link); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 283 | } |
| 284 | |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 285 | void mtp_link_set_reset(struct mtp_link_set *link) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 286 | { |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 287 | mtp_link_set_stop(link); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 288 | link->running = 1; |
| 289 | bsc_schedule_timer(&link->delay_timer, START_DELAY); |
| 290 | } |
| 291 | |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 292 | static int mtp_link_sign_msg(struct mtp_link_set *link, struct mtp_level_3_hdr *hdr, int l3_len) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 293 | { |
| 294 | struct msgb *msg; |
| 295 | struct mtp_level_3_cmn *cmn; |
Holger Hans Peter Freyther | ae74181 | 2010-12-08 11:28:12 +0100 | [diff] [blame] | 296 | uint16_t *apc; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 297 | |
Holger Hans Peter Freyther | 4e3e28e | 2010-11-26 21:05:39 +0100 | [diff] [blame] | 298 | if (hdr->ni != link->ni || l3_len < 1) { |
Holger Hans Peter Freyther | dedb7ce | 2010-10-08 17:49:24 +0800 | [diff] [blame] | 299 | LOGP(DINP, LOGL_ERROR, "Unhandled data (ni: %d len: %d)\n", |
| 300 | hdr->ni, l3_len); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 301 | return -1; |
| 302 | } |
| 303 | |
| 304 | cmn = (struct mtp_level_3_cmn *) &hdr->data[0]; |
| 305 | LOGP(DINP, LOGL_DEBUG, "reg msg: h0: 0x%x h1: 0x%x\n", |
| 306 | cmn->h0, cmn->h1); |
| 307 | |
| 308 | switch (cmn->h0) { |
| 309 | case MTP_TRF_RESTR_MSG_GRP: |
| 310 | switch (cmn->h1) { |
| 311 | case MTP_RESTR_MSG_ALLWED: |
Holger Hans Peter Freyther | ff9cd6f | 2010-12-31 21:47:14 +0100 | [diff] [blame] | 312 | LOGP(DINP, LOGL_INFO, "Received Restart Allowed. SST could be next: %p\n", link); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 313 | link->sccp_up = 0; |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 314 | mtp_link_set_sccp_down(link); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 315 | |
| 316 | msg = mtp_tfp_alloc(link, 0); |
| 317 | if (!msg) |
| 318 | return -1; |
Holger Hans Peter Freyther | 069e635 | 2011-01-04 13:01:23 +0100 | [diff] [blame] | 319 | mtp_link_set_submit(link->slc[0], msg); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 320 | |
| 321 | msg = mtp_tra_alloc(link); |
| 322 | if (!msg) |
| 323 | return -1; |
| 324 | |
Holger Hans Peter Freyther | 069e635 | 2011-01-04 13:01:23 +0100 | [diff] [blame] | 325 | mtp_link_set_submit(link->slc[0], msg); |
Holger Hans Peter Freyther | d10a3c1 | 2010-12-10 12:27:00 +0100 | [diff] [blame] | 326 | link->sccp_up = 1; |
| 327 | link->was_up = 1; |
| 328 | LOGP(DINP, LOGL_INFO, "SCCP traffic allowed. %p\n", link); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 329 | return 0; |
| 330 | break; |
| 331 | } |
| 332 | break; |
Holger Hans Peter Freyther | ae74181 | 2010-12-08 11:28:12 +0100 | [diff] [blame] | 333 | case MTP_PROHIBIT_MSG_GRP: |
| 334 | switch (cmn->h1) { |
| 335 | case MTP_PROHIBIT_MSG_SIG: |
| 336 | if (l3_len < 3) { |
| 337 | LOGP(DINP, LOGL_ERROR, "TFP is too short.\n"); |
| 338 | return -1; |
| 339 | } |
| 340 | |
| 341 | apc = (uint16_t *) &hdr->data[1]; |
| 342 | LOGP(DINP, LOGL_INFO, |
| 343 | "TFP for the affected point code: %d\n", *apc); |
| 344 | return 0; |
| 345 | break; |
| 346 | } |
| 347 | break; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 348 | } |
| 349 | |
Holger Hans Peter Freyther | 1291ce5 | 2010-12-08 11:10:34 +0100 | [diff] [blame] | 350 | 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] | 351 | return -1; |
| 352 | } |
| 353 | |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 354 | static int mtp_link_regular_msg(struct mtp_link_set *link, struct mtp_level_3_hdr *hdr, int l3_len) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 355 | { |
| 356 | struct msgb *out; |
| 357 | struct mtp_level_3_mng *mng; |
| 358 | |
Holger Hans Peter Freyther | 4e3e28e | 2010-11-26 21:05:39 +0100 | [diff] [blame] | 359 | if (hdr->ni != link->ni || l3_len < 1) { |
Holger Hans Peter Freyther | dedb7ce | 2010-10-08 17:49:24 +0800 | [diff] [blame] | 360 | LOGP(DINP, LOGL_ERROR, "Unhandled data (ni: %d len: %d)\n", |
| 361 | hdr->ni, l3_len); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 362 | return -1; |
| 363 | } |
| 364 | |
| 365 | mng = (struct mtp_level_3_mng *) &hdr->data[0]; |
| 366 | LOGP(DINP, LOGL_DEBUG, "reg msg: h0: 0x%x h1: 0x%x\n", |
| 367 | mng->cmn.h0, mng->cmn.h1); |
| 368 | |
| 369 | switch (mng->cmn.h0) { |
| 370 | case MTP_TST_MSG_GRP: |
| 371 | switch (mng->cmn.h1) { |
| 372 | case MTP_TST_MSG_SLTM: |
| 373 | /* simply respond to the request... */ |
| 374 | out = mtp_create_slta(link, mng, l3_len); |
| 375 | if (!out) |
| 376 | return -1; |
Holger Hans Peter Freyther | 069e635 | 2011-01-04 13:01:23 +0100 | [diff] [blame] | 377 | mtp_link_set_submit(link->slc[0], out); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 378 | return 0; |
| 379 | break; |
| 380 | case MTP_TST_MSG_SLTA: |
| 381 | if (mng->length != 14) { |
| 382 | LOGP(DINP, LOGL_ERROR, "Wrongly sized SLTA: %u\n", mng->length); |
| 383 | return -1; |
| 384 | } |
| 385 | |
| 386 | if (l3_len != 16) { |
| 387 | LOGP(DINP, LOGL_ERROR, "Wrongly sized SLTA: %u\n", mng->length); |
| 388 | return -1; |
| 389 | } |
| 390 | |
| 391 | if (memcmp(mng->data, link->test_ptrn, sizeof(link->test_ptrn)) != 0) { |
| 392 | LOGP(DINP, LOGL_ERROR, "Wrong test pattern SLTA\n"); |
| 393 | return -1; |
| 394 | } |
| 395 | |
| 396 | /* we had a matching slta */ |
| 397 | bsc_del_timer(&link->t1_timer); |
| 398 | link->sltm_pending = 0; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 399 | return 0; |
| 400 | break; |
| 401 | } |
| 402 | break; |
| 403 | } |
| 404 | |
| 405 | return -1; |
| 406 | } |
| 407 | |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 408 | static int mtp_link_sccp_data(struct mtp_link_set *link, struct mtp_level_3_hdr *hdr, struct msgb *msg, int l3_len) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 409 | { |
| 410 | struct msgb *out; |
| 411 | struct sccp_con_ctrl_prt_mgt *prt; |
Holger Hans Peter Freyther | d10a3c1 | 2010-12-10 12:27:00 +0100 | [diff] [blame] | 412 | struct sccp_parse_result sccp; |
Holger Hans Peter Freyther | 80ab4c6 | 2010-12-31 13:40:19 +0100 | [diff] [blame] | 413 | int type; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 414 | |
| 415 | msg->l2h = &hdr->data[0]; |
| 416 | if (msgb_l2len(msg) != l3_len) { |
| 417 | LOGP(DINP, LOGL_ERROR, "Size is wrong after playing with the l2h header.\n"); |
| 418 | return -1; |
| 419 | } |
| 420 | |
Holger Hans Peter Freyther | d10a3c1 | 2010-12-10 12:27:00 +0100 | [diff] [blame] | 421 | if (!link->sccp_up) { |
| 422 | LOGP(DINP, LOGL_ERROR, "SCCP traffic is not allowed.\n"); |
| 423 | return -1; |
| 424 | } |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 425 | |
Holger Hans Peter Freyther | d10a3c1 | 2010-12-10 12:27:00 +0100 | [diff] [blame] | 426 | memset(&sccp, 0, sizeof(sccp)); |
| 427 | if (sccp_parse_header(msg, &sccp) != 0) { |
| 428 | LOGP(DINP, LOGL_ERROR, "Failed to parsed SCCP header.\n"); |
| 429 | return -1; |
| 430 | } |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 431 | |
Holger Hans Peter Freyther | d10a3c1 | 2010-12-10 12:27:00 +0100 | [diff] [blame] | 432 | /* check if it is a SST */ |
| 433 | if (sccp_determine_msg_type(msg) == SCCP_MSG_TYPE_UDT |
| 434 | && msg->l3h[0] == SCCP_SST) { |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 435 | if (msgb_l3len(msg) != 5) { |
Holger Hans Peter Freyther | d10a3c1 | 2010-12-10 12:27:00 +0100 | [diff] [blame] | 436 | LOGP(DINP, LOGL_ERROR, |
| 437 | "SCCP UDT msg of unexpected size: %u\n", |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 438 | msgb_l3len(msg)); |
| 439 | return -1; |
| 440 | } |
| 441 | |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 442 | prt = (struct sccp_con_ctrl_prt_mgt *) &msg->l3h[0]; |
Holger Hans Peter Freyther | 7a72556 | 2011-01-01 13:34:58 +0100 | [diff] [blame] | 443 | if (prt->apoc != MTP_MAKE_APOC(link->sccp_opc)) { |
Holger Hans Peter Freyther | 0945961 | 2010-12-31 16:53:40 +0100 | [diff] [blame] | 444 | LOGP(DINP, LOGL_ERROR, "Unknown APOC: %u/%u\n", |
| 445 | ntohs(prt->apoc), prt->apoc); |
| 446 | type = SCCP_SSP; |
| 447 | } else if (prt->assn != 1 && prt->assn != 254 && |
| 448 | prt->assn != 7 && prt->assn != 8 && prt->assn != 146) { |
| 449 | LOGP(DINP, LOGL_ERROR, "Unknown affected SSN assn: %u\n", |
| 450 | prt->assn); |
Holger Hans Peter Freyther | 80ab4c6 | 2010-12-31 13:40:19 +0100 | [diff] [blame] | 451 | type = SCCP_SSP; |
| 452 | } else { |
| 453 | type = SCCP_SSA; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 454 | } |
| 455 | |
Holger Hans Peter Freyther | 101cd0b | 2011-01-19 10:51:44 +0100 | [diff] [blame^] | 456 | out = mtp_sccp_alloc_scmg(link, type, prt->assn, prt->apoc, |
Holger Hans Peter Freyther | 80ab4c6 | 2010-12-31 13:40:19 +0100 | [diff] [blame] | 457 | MTP_LINK_SLS(hdr->addr)); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 458 | if (!out) |
| 459 | return -1; |
| 460 | |
Holger Hans Peter Freyther | 069e635 | 2011-01-04 13:01:23 +0100 | [diff] [blame] | 461 | mtp_link_set_submit(link->slc[MTP_LINK_SLS(hdr->addr)], out); |
Holger Hans Peter Freyther | d10a3c1 | 2010-12-10 12:27:00 +0100 | [diff] [blame] | 462 | return 0; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 463 | } |
Holger Hans Peter Freyther | d10a3c1 | 2010-12-10 12:27:00 +0100 | [diff] [blame] | 464 | |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 465 | mtp_link_set_forward_sccp(link, msg, MTP_LINK_SLS(hdr->addr)); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 466 | return 0; |
| 467 | } |
| 468 | |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 469 | int mtp_link_set_data(struct mtp_link_set *link, struct msgb *msg) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 470 | { |
| 471 | int rc = -1; |
| 472 | struct mtp_level_3_hdr *hdr; |
| 473 | int l3_len; |
| 474 | |
| 475 | if (!msg->l2h || msgb_l2len(msg) < sizeof(*hdr)) |
| 476 | return -1; |
| 477 | |
| 478 | if (!link->running) { |
| 479 | LOGP(DINP, LOGL_ERROR, "Link is not running. Call mtp_link_reset first: %p\n", link); |
| 480 | return -1; |
| 481 | } |
| 482 | |
| 483 | hdr = (struct mtp_level_3_hdr *) msg->l2h; |
| 484 | l3_len = msgb_l2len(msg) - sizeof(*hdr); |
| 485 | |
| 486 | switch (hdr->ser_ind) { |
| 487 | case MTP_SI_MNT_SNM_MSG: |
| 488 | rc = mtp_link_sign_msg(link, hdr, l3_len); |
| 489 | break; |
| 490 | case MTP_SI_MNT_REG_MSG: |
| 491 | rc = mtp_link_regular_msg(link, hdr, l3_len); |
| 492 | break; |
| 493 | case MTP_SI_MNT_SCCP: |
| 494 | rc = mtp_link_sccp_data(link, hdr, msg, l3_len); |
| 495 | break; |
Holger Hans Peter Freyther | 3a80cb2 | 2010-12-08 11:12:46 +0100 | [diff] [blame] | 496 | case MTP_SI_MNT_ISUP: |
Holger Hans Peter Freyther | 433ea2f | 2010-12-10 07:34:01 +0100 | [diff] [blame] | 497 | msg->l3h = &hdr->data[0]; |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 498 | rc = mtp_link_set_forward_isup(link, msg, MTP_LINK_SLS(hdr->addr)); |
Holger Hans Peter Freyther | 3a80cb2 | 2010-12-08 11:12:46 +0100 | [diff] [blame] | 499 | break; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 500 | default: |
| 501 | fprintf(stderr, "Unhandled: %u\n", hdr->ser_ind); |
| 502 | break; |
| 503 | } |
| 504 | |
| 505 | return rc; |
| 506 | } |
| 507 | |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 508 | int mtp_link_set_submit_sccp_data(struct mtp_link_set *link, int sls, const uint8_t *data, unsigned int length) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 509 | { |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 510 | |
| 511 | if (!link->sccp_up) { |
| 512 | LOGP(DINP, LOGL_ERROR, "SCCP msg after TRA and before SSA. Dropping it.\n"); |
| 513 | return -1; |
| 514 | } |
| 515 | |
Holger Hans Peter Freyther | 346e1c4 | 2011-01-02 18:11:37 +0100 | [diff] [blame] | 516 | if (sls == -1) { |
| 517 | sls = link->last_sls; |
| 518 | link->last_sls = (link->last_sls + 1) % 16; |
| 519 | } |
| 520 | |
Holger Hans Peter Freyther | 7a72556 | 2011-01-01 13:34:58 +0100 | [diff] [blame] | 521 | return mtp_int_submit(link, link->sccp_opc, sls, MTP_SI_MNT_SCCP, data, length); |
Holger Hans Peter Freyther | 3aad776 | 2010-12-10 12:18:57 +0100 | [diff] [blame] | 522 | } |
| 523 | |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 524 | int mtp_link_set_submit_isup_data(struct mtp_link_set *link, int sls, |
Holger Hans Peter Freyther | 3aad776 | 2010-12-10 12:18:57 +0100 | [diff] [blame] | 525 | const uint8_t *data, unsigned int length) |
| 526 | { |
Holger Hans Peter Freyther | 7a72556 | 2011-01-01 13:34:58 +0100 | [diff] [blame] | 527 | return mtp_int_submit(link, link->opc, sls, MTP_SI_MNT_ISUP, data, length); |
Holger Hans Peter Freyther | 3aad776 | 2010-12-10 12:18:57 +0100 | [diff] [blame] | 528 | } |
| 529 | |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 530 | static int mtp_int_submit(struct mtp_link_set *link, int pc, int sls, int type, |
Holger Hans Peter Freyther | 3aad776 | 2010-12-10 12:18:57 +0100 | [diff] [blame] | 531 | const uint8_t *data, unsigned int length) |
| 532 | { |
| 533 | uint8_t *put_ptr; |
| 534 | struct mtp_level_3_hdr *hdr; |
| 535 | struct msgb *msg; |
| 536 | |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 537 | msg = mtp_msg_alloc(link); |
| 538 | if (!msg) |
| 539 | return -1; |
| 540 | |
| 541 | hdr = (struct mtp_level_3_hdr *) msg->l2h; |
Holger Hans Peter Freyther | 3aad776 | 2010-12-10 12:18:57 +0100 | [diff] [blame] | 542 | hdr->ser_ind = type; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 543 | |
Holger Hans Peter Freyther | 7a72556 | 2011-01-01 13:34:58 +0100 | [diff] [blame] | 544 | hdr->addr = MTP_ADDR(sls % 16, link->dpc, pc); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 545 | |
| 546 | /* copy the raw sccp data */ |
| 547 | put_ptr = msgb_put(msg, length); |
| 548 | memcpy(put_ptr, data, length); |
| 549 | |
Holger Hans Peter Freyther | 069e635 | 2011-01-04 13:01:23 +0100 | [diff] [blame] | 550 | mtp_link_set_submit(link->slc[sls % 16], msg); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 551 | return 0; |
| 552 | } |
Holger Hans Peter Freyther | 069e635 | 2011-01-04 13:01:23 +0100 | [diff] [blame] | 553 | |
Holger Hans Peter Freyther | 0e2f911 | 2011-01-17 11:54:39 +0100 | [diff] [blame] | 554 | static struct mtp_link *find_next_link(struct mtp_link_set *set, |
| 555 | struct mtp_link *data) |
Holger Hans Peter Freyther | d91f940 | 2011-01-16 11:56:05 +0100 | [diff] [blame] | 556 | { |
| 557 | int found = 0; |
Holger Hans Peter Freyther | 0e2f911 | 2011-01-17 11:54:39 +0100 | [diff] [blame] | 558 | struct mtp_link *next; |
Holger Hans Peter Freyther | d91f940 | 2011-01-16 11:56:05 +0100 | [diff] [blame] | 559 | |
| 560 | if (llist_empty(&set->links)) |
| 561 | return NULL; |
| 562 | |
| 563 | if (data == NULL) |
| 564 | found = 1; |
| 565 | |
| 566 | /* try to find the next one */ |
| 567 | llist_for_each_entry(next, &set->links, entry) { |
| 568 | if (found && next->available) |
| 569 | return next; |
| 570 | if (next == data) |
| 571 | found = 1; |
| 572 | } |
| 573 | |
| 574 | /* try to find any one */ |
| 575 | llist_for_each_entry(next, &set->links, entry) |
| 576 | if (next->available) |
| 577 | return next; |
| 578 | |
| 579 | return NULL; |
| 580 | } |
| 581 | |
Holger Hans Peter Freyther | 069e635 | 2011-01-04 13:01:23 +0100 | [diff] [blame] | 582 | void mtp_link_set_init_slc(struct mtp_link_set *set) |
| 583 | { |
Holger Hans Peter Freyther | 0e2f911 | 2011-01-17 11:54:39 +0100 | [diff] [blame] | 584 | struct mtp_link *link = NULL; |
Holger Hans Peter Freyther | 069e635 | 2011-01-04 13:01:23 +0100 | [diff] [blame] | 585 | int i; |
Holger Hans Peter Freyther | d91f940 | 2011-01-16 11:56:05 +0100 | [diff] [blame] | 586 | |
| 587 | |
| 588 | for (i = 0; i < ARRAY_SIZE(set->slc); ++i) { |
| 589 | link = find_next_link(set, link); |
| 590 | set->slc[i] = link; |
| 591 | } |
Holger Hans Peter Freyther | fe72c16 | 2011-01-04 13:21:52 +0100 | [diff] [blame] | 592 | } |
| 593 | |
Holger Hans Peter Freyther | 0e2f911 | 2011-01-17 11:54:39 +0100 | [diff] [blame] | 594 | void mtp_link_set_add_link(struct mtp_link_set *set, struct mtp_link *lnk) |
Holger Hans Peter Freyther | fe72c16 | 2011-01-04 13:21:52 +0100 | [diff] [blame] | 595 | { |
| 596 | llist_add_tail(&lnk->entry, &set->links); |
| 597 | mtp_link_set_init_slc(set); |
Holger Hans Peter Freyther | 069e635 | 2011-01-04 13:01:23 +0100 | [diff] [blame] | 598 | } |