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 | c5d897e | 2011-01-21 20:54:55 +0100 | [diff] [blame] | 26 | #include <counter.h> |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 27 | |
Holger Hans Peter Freyther | cbf7d18 | 2010-07-31 05:25:35 +0800 | [diff] [blame] | 28 | #include <osmocore/talloc.h> |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 29 | |
Holger Hans Peter Freyther | cf381e2 | 2010-08-04 18:39:26 +0800 | [diff] [blame] | 30 | #include <osmocom/sccp/sccp.h> |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 31 | |
| 32 | #include <arpa/inet.h> |
| 33 | |
| 34 | #include <string.h> |
| 35 | |
| 36 | static void *tall_mtp_ctx = NULL; |
| 37 | |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 38 | 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] | 39 | |
Holger Hans Peter Freyther | 9543f4a | 2011-01-24 20:49:58 +0100 | [diff] [blame^] | 40 | void mtp_link_submit(struct mtp_link *link, struct msgb *msg) |
Holger Hans Peter Freyther | c5d897e | 2011-01-21 20:54:55 +0100 | [diff] [blame] | 41 | { |
Holger Hans Peter Freyther | 4c1eb0e | 2011-01-22 15:52:07 +0100 | [diff] [blame] | 42 | rate_ctr_inc(&link->ctrg->ctr[MTP_LNK_OUT]); |
Holger Hans Peter Freyther | c5d897e | 2011-01-21 20:54:55 +0100 | [diff] [blame] | 43 | rate_ctr_inc(&link->set->ctrg->ctr[MTP_LSET_TOTA_OUT_MSG]); |
| 44 | link->write(link, msg); |
| 45 | } |
| 46 | |
| 47 | |
Holger Hans Peter Freyther | a8ce061 | 2011-01-20 16:30:24 +0100 | [diff] [blame] | 48 | struct msgb *mtp_msg_alloc(struct mtp_link_set *link) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 49 | { |
| 50 | struct mtp_level_3_hdr *hdr; |
| 51 | struct msgb *msg = msgb_alloc_headroom(4096, 128, "mtp-msg"); |
| 52 | if (!msg) { |
| 53 | LOGP(DINP, LOGL_ERROR, "Failed to allocate mtp msg\n"); |
| 54 | return NULL; |
| 55 | } |
| 56 | |
| 57 | msg->l2h = msgb_put(msg, sizeof(*hdr)); |
| 58 | hdr = (struct mtp_level_3_hdr *) msg->l2h; |
| 59 | hdr->addr = MTP_ADDR(0x0, link->dpc, link->opc); |
Holger Hans Peter Freyther | 4e3e28e | 2010-11-26 21:05:39 +0100 | [diff] [blame] | 60 | hdr->ni = link->ni; |
Holger Hans Peter Freyther | e976df1 | 2010-11-26 21:07:11 +0100 | [diff] [blame] | 61 | hdr->spare = link->spare; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 62 | return msg; |
| 63 | } |
| 64 | |
Holger Hans Peter Freyther | 050577a | 2011-01-20 19:28:15 +0100 | [diff] [blame] | 65 | static struct msgb *mtp_create_slta(struct mtp_link_set *link, int sls, |
| 66 | struct mtp_level_3_mng *in_mng, int l3_len) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 67 | { |
| 68 | struct mtp_level_3_hdr *hdr; |
| 69 | struct mtp_level_3_mng *mng; |
| 70 | struct msgb *out = mtp_msg_alloc(link); |
| 71 | |
| 72 | if (!out) |
| 73 | return NULL; |
| 74 | |
| 75 | hdr = (struct mtp_level_3_hdr *) out->l2h; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 76 | hdr->ser_ind = MTP_SI_MNT_REG_MSG; |
Holger Hans Peter Freyther | 050577a | 2011-01-20 19:28:15 +0100 | [diff] [blame] | 77 | hdr->addr = MTP_ADDR(sls, link->dpc, link->opc); |
| 78 | |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 79 | mng = (struct mtp_level_3_mng *) msgb_put(out, sizeof(*mng)); |
| 80 | mng->cmn.h0 = MTP_TST_MSG_GRP; |
| 81 | mng->cmn.h1 = MTP_TST_MSG_SLTA; |
| 82 | mng->length = l3_len - 2; |
| 83 | msgb_put(out, mng->length); |
| 84 | memcpy(mng->data, in_mng->data, mng->length); |
| 85 | |
| 86 | return out; |
| 87 | } |
| 88 | |
Holger Hans Peter Freyther | a8ce061 | 2011-01-20 16:30:24 +0100 | [diff] [blame] | 89 | |
Holger Hans Peter Freyther | cfbe80f | 2011-01-18 20:35:11 +0100 | [diff] [blame] | 90 | static struct msgb *mtp_base_alloc(struct mtp_link_set *link, int msg, int apoc) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 91 | { |
| 92 | struct mtp_level_3_hdr *hdr; |
| 93 | struct mtp_level_3_prohib *prb; |
| 94 | struct msgb *out = mtp_msg_alloc(link); |
| 95 | |
| 96 | if (!out) |
| 97 | return NULL; |
| 98 | |
| 99 | hdr = (struct mtp_level_3_hdr *) out->l2h; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 100 | hdr->ser_ind = MTP_SI_MNT_SNM_MSG; |
| 101 | prb = (struct mtp_level_3_prohib *) msgb_put(out, sizeof(*prb)); |
| 102 | prb->cmn.h0 = MTP_PROHIBIT_MSG_GRP; |
Holger Hans Peter Freyther | cfbe80f | 2011-01-18 20:35:11 +0100 | [diff] [blame] | 103 | prb->cmn.h1 = msg; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 104 | prb->apoc = MTP_MAKE_APOC(apoc); |
| 105 | return out; |
| 106 | } |
| 107 | |
Holger Hans Peter Freyther | cfbe80f | 2011-01-18 20:35:11 +0100 | [diff] [blame] | 108 | static struct msgb *mtp_tfp_alloc(struct mtp_link_set *link, int apoc) |
| 109 | { |
| 110 | return mtp_base_alloc(link, MTP_PROHIBIT_MSG_SIG, apoc); |
| 111 | } |
| 112 | |
| 113 | static struct msgb *mtp_tfa_alloc(struct mtp_link_set *link, int apoc) |
| 114 | { |
| 115 | return mtp_base_alloc(link, MTP_PROHIBIT_MSG_TFA, apoc); |
| 116 | } |
| 117 | |
Holger Hans Peter Freyther | adf7692 | 2011-01-18 19:01:43 +0100 | [diff] [blame] | 118 | static struct msgb *mtp_tra_alloc(struct mtp_link_set *link, int opc) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 119 | { |
| 120 | struct mtp_level_3_hdr *hdr; |
| 121 | struct mtp_level_3_cmn *cmn; |
| 122 | struct msgb *out = mtp_msg_alloc(link); |
| 123 | |
| 124 | if (!out) |
| 125 | return NULL; |
| 126 | |
| 127 | hdr = (struct mtp_level_3_hdr *) out->l2h; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 128 | hdr->ser_ind = MTP_SI_MNT_SNM_MSG; |
Holger Hans Peter Freyther | adf7692 | 2011-01-18 19:01:43 +0100 | [diff] [blame] | 129 | hdr->addr = MTP_ADDR(0x0, link->dpc, opc); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 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 | |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 136 | 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] | 137 | int type, int assn, int apoc, int sls) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 138 | { |
| 139 | struct sccp_data_unitdata *udt; |
| 140 | struct sccp_con_ctrl_prt_mgt *prt; |
| 141 | struct mtp_level_3_hdr *hdr; |
Holger Hans Peter Freyther | 5aa1701 | 2010-07-31 04:37:26 +0800 | [diff] [blame] | 142 | uint8_t *data; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 143 | |
| 144 | |
| 145 | struct msgb *out = mtp_msg_alloc(link); |
| 146 | |
| 147 | if (!out) |
| 148 | return NULL; |
| 149 | |
| 150 | hdr = (struct mtp_level_3_hdr *) out->l2h; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 151 | hdr->ser_ind = MTP_SI_MNT_SCCP; |
| 152 | |
| 153 | /* this appears to be round robin or such.. */ |
Holger Hans Peter Freyther | 7a72556 | 2011-01-01 13:34:58 +0100 | [diff] [blame] | 154 | 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] | 155 | |
| 156 | /* generate the UDT message... libsccp does not offer formating yet */ |
| 157 | udt = (struct sccp_data_unitdata *) msgb_put(out, sizeof(*udt)); |
| 158 | udt->type = SCCP_MSG_TYPE_UDT; |
| 159 | udt->proto_class = SCCP_PROTOCOL_CLASS_0; |
| 160 | udt->variable_called = 3; |
| 161 | udt->variable_calling = 5; |
| 162 | udt->variable_data = 7; |
| 163 | |
| 164 | /* put the called and calling address. It is LV */ |
| 165 | data = msgb_put(out, 2 + 1); |
| 166 | data[0] = 2; |
| 167 | data[1] = 0x42; |
| 168 | data[2] = 0x1; |
| 169 | |
| 170 | data = msgb_put(out, 2 + 1); |
| 171 | data[0] = 2; |
| 172 | data[1] = 0x42; |
| 173 | data[2] = 0x1; |
| 174 | |
| 175 | data = msgb_put(out, 1); |
| 176 | data[0] = sizeof(*prt); |
| 177 | |
| 178 | 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] | 179 | prt->sst = type; |
| 180 | prt->assn = assn; |
Holger Hans Peter Freyther | 101cd0b | 2011-01-19 10:51:44 +0100 | [diff] [blame] | 181 | prt->apoc = apoc; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 182 | prt->mul_ind = 0; |
| 183 | |
| 184 | return out; |
| 185 | } |
| 186 | |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 187 | void mtp_link_set_init(void) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 188 | { |
| 189 | tall_mtp_ctx = talloc_named_const(NULL, 1, "mtp-link"); |
| 190 | } |
| 191 | |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 192 | struct mtp_link_set *mtp_link_set_alloc(void) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 193 | { |
Holger Hans Peter Freyther | c5d897e | 2011-01-21 20:54:55 +0100 | [diff] [blame] | 194 | static int linkset_no = 0; |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 195 | struct mtp_link_set *link; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 196 | |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 197 | link = talloc_zero(tall_mtp_ctx, struct mtp_link_set); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 198 | if (!link) |
| 199 | return NULL; |
| 200 | |
Holger Hans Peter Freyther | c5d897e | 2011-01-21 20:54:55 +0100 | [diff] [blame] | 201 | link->ctrg = rate_ctr_group_alloc(link, |
| 202 | mtp_link_set_rate_ctr_desc(), |
| 203 | linkset_no++); |
| 204 | if (!link->ctrg) { |
| 205 | LOGP(DINP, LOGL_ERROR, "Failed to allocate counter.\n"); |
| 206 | return NULL; |
| 207 | } |
| 208 | |
| 209 | |
Holger Hans Peter Freyther | 4e3e28e | 2010-11-26 21:05:39 +0100 | [diff] [blame] | 210 | link->ni = MTP_NI_NATION_NET; |
Holger Hans Peter Freyther | fe72c16 | 2011-01-04 13:21:52 +0100 | [diff] [blame] | 211 | INIT_LLIST_HEAD(&link->links); |
| 212 | |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 213 | return link; |
| 214 | } |
| 215 | |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 216 | void mtp_link_set_stop(struct mtp_link_set *link) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 217 | { |
Holger Hans Peter Freyther | a8ce061 | 2011-01-20 16:30:24 +0100 | [diff] [blame] | 218 | struct mtp_link *lnk; |
| 219 | llist_for_each_entry(lnk, &link->links, entry) |
| 220 | mtp_link_stop_link_test(lnk); |
| 221 | |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 222 | link->sccp_up = 0; |
| 223 | link->running = 0; |
Holger Hans Peter Freyther | 606eae8 | 2011-01-20 14:23:10 +0100 | [diff] [blame] | 224 | link->linkset_up = 0; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 225 | } |
| 226 | |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 227 | void mtp_link_set_reset(struct mtp_link_set *link) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 228 | { |
Holger Hans Peter Freyther | a8ce061 | 2011-01-20 16:30:24 +0100 | [diff] [blame] | 229 | struct mtp_link *lnk; |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 230 | mtp_link_set_stop(link); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 231 | link->running = 1; |
Holger Hans Peter Freyther | a8ce061 | 2011-01-20 16:30:24 +0100 | [diff] [blame] | 232 | |
| 233 | llist_for_each_entry(lnk, &link->links, entry) |
| 234 | mtp_link_start_link_test(lnk); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 235 | } |
| 236 | |
Holger Hans Peter Freyther | 27c5e23 | 2011-01-18 18:52:34 +0100 | [diff] [blame] | 237 | static int send_tfp(struct mtp_link_set *link, int apoc) |
| 238 | { |
| 239 | struct msgb *msg; |
| 240 | msg = mtp_tfp_alloc(link, apoc); |
| 241 | if (!msg) |
| 242 | return -1; |
| 243 | |
Holger Hans Peter Freyther | 9543f4a | 2011-01-24 20:49:58 +0100 | [diff] [blame^] | 244 | mtp_link_submit(link->slc[0], msg); |
Holger Hans Peter Freyther | 27c5e23 | 2011-01-18 18:52:34 +0100 | [diff] [blame] | 245 | return 0; |
| 246 | } |
| 247 | |
Holger Hans Peter Freyther | adf7692 | 2011-01-18 19:01:43 +0100 | [diff] [blame] | 248 | static int send_tra(struct mtp_link_set *link, int opc) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 249 | { |
| 250 | struct msgb *msg; |
Holger Hans Peter Freyther | adf7692 | 2011-01-18 19:01:43 +0100 | [diff] [blame] | 251 | msg = mtp_tra_alloc(link, opc); |
| 252 | if (!msg) |
| 253 | return -1; |
Holger Hans Peter Freyther | 9543f4a | 2011-01-24 20:49:58 +0100 | [diff] [blame^] | 254 | mtp_link_submit(link->slc[0], msg); |
Holger Hans Peter Freyther | adf7692 | 2011-01-18 19:01:43 +0100 | [diff] [blame] | 255 | return 0; |
| 256 | } |
| 257 | |
Holger Hans Peter Freyther | cfbe80f | 2011-01-18 20:35:11 +0100 | [diff] [blame] | 258 | static int send_tfa(struct mtp_link_set *link, int opc) |
| 259 | { |
| 260 | struct msgb *msg; |
| 261 | msg = mtp_tfa_alloc(link, opc); |
| 262 | if (!msg) |
| 263 | return -1; |
Holger Hans Peter Freyther | 9543f4a | 2011-01-24 20:49:58 +0100 | [diff] [blame^] | 264 | mtp_link_submit(link->slc[0], msg); |
Holger Hans Peter Freyther | cfbe80f | 2011-01-18 20:35:11 +0100 | [diff] [blame] | 265 | return 0; |
| 266 | } |
| 267 | |
Holger Hans Peter Freyther | 606eae8 | 2011-01-20 14:23:10 +0100 | [diff] [blame] | 268 | static int linkset_up(struct mtp_link_set *set) |
| 269 | { |
| 270 | /* the link set is already up */ |
| 271 | if (set->linkset_up) |
| 272 | return 0; |
| 273 | |
| 274 | if (send_tfp(set, 0) != 0) |
| 275 | return -1; |
| 276 | if (send_tfp(set, set->opc) != 0) |
| 277 | return -1; |
| 278 | if (set->sccp_opc != set->opc && |
| 279 | send_tfp(set, set->sccp_opc) != 0) |
| 280 | return -1; |
| 281 | if (set->isup_opc != set->opc && |
| 282 | send_tfp(set, set->isup_opc) != 0) |
| 283 | return -1; |
| 284 | |
| 285 | /* Send the TRA for all PCs */ |
| 286 | if (send_tra(set, set->opc) != 0) |
| 287 | return -1; |
| 288 | if (set->sccp_opc != set->opc && |
| 289 | send_tfa(set, set->sccp_opc) != 0) |
| 290 | return -1; |
| 291 | if (set->isup_opc != set->opc && |
| 292 | send_tfa(set, set->isup_opc) != 0) |
| 293 | return -1; |
| 294 | |
| 295 | set->linkset_up = 1; |
| 296 | LOGP(DINP, LOGL_NOTICE, |
| 297 | "The linkset %p is considered running.\n", set); |
| 298 | return 0; |
| 299 | } |
| 300 | |
Holger Hans Peter Freyther | adf7692 | 2011-01-18 19:01:43 +0100 | [diff] [blame] | 301 | static int mtp_link_sign_msg(struct mtp_link_set *link, struct mtp_level_3_hdr *hdr, int l3_len) |
| 302 | { |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 303 | struct mtp_level_3_cmn *cmn; |
Holger Hans Peter Freyther | ae74181 | 2010-12-08 11:28:12 +0100 | [diff] [blame] | 304 | uint16_t *apc; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 305 | |
Holger Hans Peter Freyther | 4e3e28e | 2010-11-26 21:05:39 +0100 | [diff] [blame] | 306 | if (hdr->ni != link->ni || l3_len < 1) { |
Holger Hans Peter Freyther | dedb7ce | 2010-10-08 17:49:24 +0800 | [diff] [blame] | 307 | LOGP(DINP, LOGL_ERROR, "Unhandled data (ni: %d len: %d)\n", |
| 308 | hdr->ni, l3_len); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 309 | return -1; |
| 310 | } |
| 311 | |
| 312 | cmn = (struct mtp_level_3_cmn *) &hdr->data[0]; |
| 313 | LOGP(DINP, LOGL_DEBUG, "reg msg: h0: 0x%x h1: 0x%x\n", |
| 314 | cmn->h0, cmn->h1); |
| 315 | |
| 316 | switch (cmn->h0) { |
| 317 | case MTP_TRF_RESTR_MSG_GRP: |
| 318 | switch (cmn->h1) { |
| 319 | case MTP_RESTR_MSG_ALLWED: |
Holger Hans Peter Freyther | ff9cd6f | 2010-12-31 21:47:14 +0100 | [diff] [blame] | 320 | LOGP(DINP, LOGL_INFO, "Received Restart Allowed. SST could be next: %p\n", link); |
Holger Hans Peter Freyther | d10a3c1 | 2010-12-10 12:27:00 +0100 | [diff] [blame] | 321 | link->sccp_up = 1; |
Holger Hans Peter Freyther | d10a3c1 | 2010-12-10 12:27:00 +0100 | [diff] [blame] | 322 | LOGP(DINP, LOGL_INFO, "SCCP traffic allowed. %p\n", link); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 323 | return 0; |
| 324 | break; |
| 325 | } |
| 326 | break; |
Holger Hans Peter Freyther | ae74181 | 2010-12-08 11:28:12 +0100 | [diff] [blame] | 327 | case MTP_PROHIBIT_MSG_GRP: |
| 328 | switch (cmn->h1) { |
| 329 | case MTP_PROHIBIT_MSG_SIG: |
| 330 | if (l3_len < 3) { |
| 331 | LOGP(DINP, LOGL_ERROR, "TFP is too short.\n"); |
| 332 | return -1; |
| 333 | } |
| 334 | |
| 335 | apc = (uint16_t *) &hdr->data[1]; |
| 336 | LOGP(DINP, LOGL_INFO, |
| 337 | "TFP for the affected point code: %d\n", *apc); |
| 338 | return 0; |
| 339 | break; |
| 340 | } |
| 341 | break; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 342 | } |
| 343 | |
Holger Hans Peter Freyther | 1291ce5 | 2010-12-08 11:10:34 +0100 | [diff] [blame] | 344 | 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] | 345 | return -1; |
| 346 | } |
| 347 | |
Holger Hans Peter Freyther | a8ce061 | 2011-01-20 16:30:24 +0100 | [diff] [blame] | 348 | static int mtp_link_regular_msg(struct mtp_link *link, struct mtp_level_3_hdr *hdr, int l3_len) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 349 | { |
| 350 | struct msgb *out; |
| 351 | struct mtp_level_3_mng *mng; |
| 352 | |
Holger Hans Peter Freyther | a8ce061 | 2011-01-20 16:30:24 +0100 | [diff] [blame] | 353 | if (hdr->ni != link->set->ni || l3_len < 1) { |
Holger Hans Peter Freyther | dedb7ce | 2010-10-08 17:49:24 +0800 | [diff] [blame] | 354 | LOGP(DINP, LOGL_ERROR, "Unhandled data (ni: %d len: %d)\n", |
| 355 | hdr->ni, l3_len); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 356 | return -1; |
| 357 | } |
| 358 | |
Holger Hans Peter Freyther | a8ce061 | 2011-01-20 16:30:24 +0100 | [diff] [blame] | 359 | if (MTP_ADDR_DPC(hdr->addr) != link->set->opc) { |
Holger Hans Peter Freyther | 157de2a | 2011-01-20 13:05:54 +0100 | [diff] [blame] | 360 | LOGP(DINP, LOGL_ERROR, "MSG for 0x%x not handled by 0x%x\n", |
Holger Hans Peter Freyther | a8ce061 | 2011-01-20 16:30:24 +0100 | [diff] [blame] | 361 | MTP_ADDR_DPC(hdr->addr), link->set->opc); |
Holger Hans Peter Freyther | 157de2a | 2011-01-20 13:05:54 +0100 | [diff] [blame] | 362 | return -1; |
| 363 | } |
| 364 | |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 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... */ |
Holger Hans Peter Freyther | 050577a | 2011-01-20 19:28:15 +0100 | [diff] [blame] | 374 | out = mtp_create_slta(link->set, |
| 375 | MTP_LINK_SLS(hdr->addr), |
| 376 | mng, l3_len); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 377 | if (!out) |
| 378 | return -1; |
Holger Hans Peter Freyther | 9543f4a | 2011-01-24 20:49:58 +0100 | [diff] [blame^] | 379 | mtp_link_submit(link, out); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 380 | return 0; |
| 381 | break; |
| 382 | case MTP_TST_MSG_SLTA: |
Holger Hans Peter Freyther | a8ce061 | 2011-01-20 16:30:24 +0100 | [diff] [blame] | 383 | /* If this link is proven set it up */ |
| 384 | if (mtp_link_slta(link, l3_len, mng) == 0) |
| 385 | linkset_up(link->set); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 386 | break; |
| 387 | } |
| 388 | break; |
| 389 | } |
| 390 | |
| 391 | return -1; |
| 392 | } |
| 393 | |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 394 | 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] | 395 | { |
| 396 | struct msgb *out; |
| 397 | struct sccp_con_ctrl_prt_mgt *prt; |
Holger Hans Peter Freyther | d10a3c1 | 2010-12-10 12:27:00 +0100 | [diff] [blame] | 398 | struct sccp_parse_result sccp; |
Holger Hans Peter Freyther | 80ab4c6 | 2010-12-31 13:40:19 +0100 | [diff] [blame] | 399 | int type; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 400 | |
| 401 | msg->l2h = &hdr->data[0]; |
| 402 | if (msgb_l2len(msg) != l3_len) { |
| 403 | LOGP(DINP, LOGL_ERROR, "Size is wrong after playing with the l2h header.\n"); |
| 404 | return -1; |
| 405 | } |
| 406 | |
Holger Hans Peter Freyther | d10a3c1 | 2010-12-10 12:27:00 +0100 | [diff] [blame] | 407 | if (!link->sccp_up) { |
| 408 | LOGP(DINP, LOGL_ERROR, "SCCP traffic is not allowed.\n"); |
| 409 | return -1; |
| 410 | } |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 411 | |
Holger Hans Peter Freyther | d10a3c1 | 2010-12-10 12:27:00 +0100 | [diff] [blame] | 412 | memset(&sccp, 0, sizeof(sccp)); |
| 413 | if (sccp_parse_header(msg, &sccp) != 0) { |
| 414 | LOGP(DINP, LOGL_ERROR, "Failed to parsed SCCP header.\n"); |
| 415 | return -1; |
| 416 | } |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 417 | |
Holger Hans Peter Freyther | d10a3c1 | 2010-12-10 12:27:00 +0100 | [diff] [blame] | 418 | /* check if it is a SST */ |
| 419 | if (sccp_determine_msg_type(msg) == SCCP_MSG_TYPE_UDT |
| 420 | && msg->l3h[0] == SCCP_SST) { |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 421 | if (msgb_l3len(msg) != 5) { |
Holger Hans Peter Freyther | d10a3c1 | 2010-12-10 12:27:00 +0100 | [diff] [blame] | 422 | LOGP(DINP, LOGL_ERROR, |
| 423 | "SCCP UDT msg of unexpected size: %u\n", |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 424 | msgb_l3len(msg)); |
| 425 | return -1; |
| 426 | } |
| 427 | |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 428 | prt = (struct sccp_con_ctrl_prt_mgt *) &msg->l3h[0]; |
Holger Hans Peter Freyther | 7a72556 | 2011-01-01 13:34:58 +0100 | [diff] [blame] | 429 | if (prt->apoc != MTP_MAKE_APOC(link->sccp_opc)) { |
Holger Hans Peter Freyther | 0945961 | 2010-12-31 16:53:40 +0100 | [diff] [blame] | 430 | LOGP(DINP, LOGL_ERROR, "Unknown APOC: %u/%u\n", |
| 431 | ntohs(prt->apoc), prt->apoc); |
| 432 | type = SCCP_SSP; |
| 433 | } else if (prt->assn != 1 && prt->assn != 254 && |
| 434 | prt->assn != 7 && prt->assn != 8 && prt->assn != 146) { |
| 435 | LOGP(DINP, LOGL_ERROR, "Unknown affected SSN assn: %u\n", |
| 436 | prt->assn); |
Holger Hans Peter Freyther | 80ab4c6 | 2010-12-31 13:40:19 +0100 | [diff] [blame] | 437 | type = SCCP_SSP; |
| 438 | } else { |
| 439 | type = SCCP_SSA; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 440 | } |
| 441 | |
Holger Hans Peter Freyther | 101cd0b | 2011-01-19 10:51:44 +0100 | [diff] [blame] | 442 | 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] | 443 | MTP_LINK_SLS(hdr->addr)); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 444 | if (!out) |
| 445 | return -1; |
| 446 | |
Holger Hans Peter Freyther | 9543f4a | 2011-01-24 20:49:58 +0100 | [diff] [blame^] | 447 | mtp_link_submit(link->slc[MTP_LINK_SLS(hdr->addr)], out); |
Holger Hans Peter Freyther | d10a3c1 | 2010-12-10 12:27:00 +0100 | [diff] [blame] | 448 | return 0; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 449 | } |
Holger Hans Peter Freyther | d10a3c1 | 2010-12-10 12:27:00 +0100 | [diff] [blame] | 450 | |
Holger Hans Peter Freyther | c5d897e | 2011-01-21 20:54:55 +0100 | [diff] [blame] | 451 | rate_ctr_inc(&link->ctrg->ctr[MTP_LSET_SCCP_IN_MSG]); |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 452 | 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] | 453 | return 0; |
| 454 | } |
| 455 | |
Holger Hans Peter Freyther | bee2ed1 | 2011-01-18 13:29:42 +0100 | [diff] [blame] | 456 | int mtp_link_set_data(struct mtp_link *link, struct msgb *msg) |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 457 | { |
| 458 | int rc = -1; |
| 459 | struct mtp_level_3_hdr *hdr; |
| 460 | int l3_len; |
| 461 | |
| 462 | if (!msg->l2h || msgb_l2len(msg) < sizeof(*hdr)) |
| 463 | return -1; |
| 464 | |
Holger Hans Peter Freyther | 2d845fc | 2011-01-20 15:42:13 +0100 | [diff] [blame] | 465 | if (!link->set->running) { |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 466 | LOGP(DINP, LOGL_ERROR, "Link is not running. Call mtp_link_reset first: %p\n", link); |
| 467 | return -1; |
| 468 | } |
| 469 | |
| 470 | hdr = (struct mtp_level_3_hdr *) msg->l2h; |
| 471 | l3_len = msgb_l2len(msg) - sizeof(*hdr); |
| 472 | |
Holger Hans Peter Freyther | c5d897e | 2011-01-21 20:54:55 +0100 | [diff] [blame] | 473 | rate_ctr_inc(&link->set->ctrg->ctr[MTP_LSET_TOTA_IN_MSG]); |
| 474 | |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 475 | switch (hdr->ser_ind) { |
| 476 | case MTP_SI_MNT_SNM_MSG: |
Holger Hans Peter Freyther | 2d845fc | 2011-01-20 15:42:13 +0100 | [diff] [blame] | 477 | rc = mtp_link_sign_msg(link->set, hdr, l3_len); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 478 | break; |
| 479 | case MTP_SI_MNT_REG_MSG: |
Holger Hans Peter Freyther | a8ce061 | 2011-01-20 16:30:24 +0100 | [diff] [blame] | 480 | rc = mtp_link_regular_msg(link, hdr, l3_len); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 481 | break; |
| 482 | case MTP_SI_MNT_SCCP: |
Holger Hans Peter Freyther | 2d845fc | 2011-01-20 15:42:13 +0100 | [diff] [blame] | 483 | rc = mtp_link_sccp_data(link->set, hdr, msg, l3_len); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 484 | break; |
Holger Hans Peter Freyther | 3a80cb2 | 2010-12-08 11:12:46 +0100 | [diff] [blame] | 485 | case MTP_SI_MNT_ISUP: |
Holger Hans Peter Freyther | 433ea2f | 2010-12-10 07:34:01 +0100 | [diff] [blame] | 486 | msg->l3h = &hdr->data[0]; |
Holger Hans Peter Freyther | c5d897e | 2011-01-21 20:54:55 +0100 | [diff] [blame] | 487 | rate_ctr_inc(&link->set->ctrg->ctr[MTP_LSET_IUSP_IN_MSG]); |
Holger Hans Peter Freyther | 2d845fc | 2011-01-20 15:42:13 +0100 | [diff] [blame] | 488 | rc = mtp_link_set_isup(link->set, msg, MTP_LINK_SLS(hdr->addr)); |
Holger Hans Peter Freyther | 3a80cb2 | 2010-12-08 11:12:46 +0100 | [diff] [blame] | 489 | break; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 490 | default: |
| 491 | fprintf(stderr, "Unhandled: %u\n", hdr->ser_ind); |
| 492 | break; |
| 493 | } |
| 494 | |
| 495 | return rc; |
| 496 | } |
| 497 | |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 498 | 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] | 499 | { |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 500 | |
| 501 | if (!link->sccp_up) { |
| 502 | LOGP(DINP, LOGL_ERROR, "SCCP msg after TRA and before SSA. Dropping it.\n"); |
| 503 | return -1; |
| 504 | } |
| 505 | |
Holger Hans Peter Freyther | 346e1c4 | 2011-01-02 18:11:37 +0100 | [diff] [blame] | 506 | if (sls == -1) { |
| 507 | sls = link->last_sls; |
| 508 | link->last_sls = (link->last_sls + 1) % 16; |
| 509 | } |
| 510 | |
Holger Hans Peter Freyther | c5d897e | 2011-01-21 20:54:55 +0100 | [diff] [blame] | 511 | rate_ctr_inc(&link->ctrg->ctr[MTP_LSET_SCCP_OUT_MSG]); |
Holger Hans Peter Freyther | 7a72556 | 2011-01-01 13:34:58 +0100 | [diff] [blame] | 512 | 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] | 513 | } |
| 514 | |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 515 | 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] | 516 | const uint8_t *data, unsigned int length) |
| 517 | { |
Holger Hans Peter Freyther | c5d897e | 2011-01-21 20:54:55 +0100 | [diff] [blame] | 518 | rate_ctr_inc(&link->ctrg->ctr[MTP_LSET_ISUP_OUT_MSG]); |
Holger Hans Peter Freyther | d8a73e2 | 2011-01-17 22:37:11 +0100 | [diff] [blame] | 519 | return mtp_int_submit(link, link->isup_opc, sls, MTP_SI_MNT_ISUP, data, length); |
Holger Hans Peter Freyther | 3aad776 | 2010-12-10 12:18:57 +0100 | [diff] [blame] | 520 | } |
| 521 | |
Holger Hans Peter Freyther | 569f1e1 | 2011-01-02 18:47:49 +0100 | [diff] [blame] | 522 | 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] | 523 | const uint8_t *data, unsigned int length) |
| 524 | { |
| 525 | uint8_t *put_ptr; |
| 526 | struct mtp_level_3_hdr *hdr; |
| 527 | struct msgb *msg; |
| 528 | |
Holger Hans Peter Freyther | 92affda | 2011-01-17 20:12:32 +0100 | [diff] [blame] | 529 | if (!link->slc[sls % 16]) |
| 530 | return -1; |
| 531 | |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 532 | msg = mtp_msg_alloc(link); |
| 533 | if (!msg) |
| 534 | return -1; |
| 535 | |
| 536 | hdr = (struct mtp_level_3_hdr *) msg->l2h; |
Holger Hans Peter Freyther | 3aad776 | 2010-12-10 12:18:57 +0100 | [diff] [blame] | 537 | hdr->ser_ind = type; |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 538 | |
Holger Hans Peter Freyther | 7a72556 | 2011-01-01 13:34:58 +0100 | [diff] [blame] | 539 | hdr->addr = MTP_ADDR(sls % 16, link->dpc, pc); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 540 | |
| 541 | /* copy the raw sccp data */ |
| 542 | put_ptr = msgb_put(msg, length); |
| 543 | memcpy(put_ptr, data, length); |
| 544 | |
Holger Hans Peter Freyther | 9543f4a | 2011-01-24 20:49:58 +0100 | [diff] [blame^] | 545 | mtp_link_submit(link->slc[sls % 16], msg); |
Holger Hans Peter Freyther | 97f66e2 | 2010-07-28 03:32:52 +0800 | [diff] [blame] | 546 | return 0; |
| 547 | } |
Holger Hans Peter Freyther | 069e635 | 2011-01-04 13:01:23 +0100 | [diff] [blame] | 548 | |
Holger Hans Peter Freyther | 0e2f911 | 2011-01-17 11:54:39 +0100 | [diff] [blame] | 549 | static struct mtp_link *find_next_link(struct mtp_link_set *set, |
| 550 | struct mtp_link *data) |
Holger Hans Peter Freyther | d91f940 | 2011-01-16 11:56:05 +0100 | [diff] [blame] | 551 | { |
| 552 | int found = 0; |
Holger Hans Peter Freyther | 0e2f911 | 2011-01-17 11:54:39 +0100 | [diff] [blame] | 553 | struct mtp_link *next; |
Holger Hans Peter Freyther | d91f940 | 2011-01-16 11:56:05 +0100 | [diff] [blame] | 554 | |
| 555 | if (llist_empty(&set->links)) |
| 556 | return NULL; |
| 557 | |
| 558 | if (data == NULL) |
| 559 | found = 1; |
| 560 | |
| 561 | /* try to find the next one */ |
| 562 | llist_for_each_entry(next, &set->links, entry) { |
| 563 | if (found && next->available) |
| 564 | return next; |
| 565 | if (next == data) |
| 566 | found = 1; |
| 567 | } |
| 568 | |
| 569 | /* try to find any one */ |
| 570 | llist_for_each_entry(next, &set->links, entry) |
| 571 | if (next->available) |
| 572 | return next; |
| 573 | |
| 574 | return NULL; |
| 575 | } |
| 576 | |
Holger Hans Peter Freyther | 069e635 | 2011-01-04 13:01:23 +0100 | [diff] [blame] | 577 | void mtp_link_set_init_slc(struct mtp_link_set *set) |
| 578 | { |
Holger Hans Peter Freyther | 0e2f911 | 2011-01-17 11:54:39 +0100 | [diff] [blame] | 579 | struct mtp_link *link = NULL; |
Holger Hans Peter Freyther | 069e635 | 2011-01-04 13:01:23 +0100 | [diff] [blame] | 580 | int i; |
Holger Hans Peter Freyther | d91f940 | 2011-01-16 11:56:05 +0100 | [diff] [blame] | 581 | |
| 582 | |
| 583 | for (i = 0; i < ARRAY_SIZE(set->slc); ++i) { |
| 584 | link = find_next_link(set, link); |
| 585 | set->slc[i] = link; |
| 586 | } |
Holger Hans Peter Freyther | fe72c16 | 2011-01-04 13:21:52 +0100 | [diff] [blame] | 587 | } |
| 588 | |
Holger Hans Peter Freyther | 4c1eb0e | 2011-01-22 15:52:07 +0100 | [diff] [blame] | 589 | int 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] | 590 | { |
Holger Hans Peter Freyther | 2d845fc | 2011-01-20 15:42:13 +0100 | [diff] [blame] | 591 | lnk->set = set; |
Holger Hans Peter Freyther | 1cc2456 | 2011-01-20 18:26:18 +0100 | [diff] [blame] | 592 | lnk->link_no = set->nr_links++; |
Holger Hans Peter Freyther | 4c1eb0e | 2011-01-22 15:52:07 +0100 | [diff] [blame] | 593 | if (mtp_link_init(lnk) != 0) |
| 594 | return -1; |
Holger Hans Peter Freyther | a8ce061 | 2011-01-20 16:30:24 +0100 | [diff] [blame] | 595 | |
| 596 | llist_add_tail(&lnk->entry, &set->links); |
Holger Hans Peter Freyther | fe72c16 | 2011-01-04 13:21:52 +0100 | [diff] [blame] | 597 | mtp_link_set_init_slc(set); |
Holger Hans Peter Freyther | 4c1eb0e | 2011-01-22 15:52:07 +0100 | [diff] [blame] | 598 | return 0; |
Holger Hans Peter Freyther | 069e635 | 2011-01-04 13:01:23 +0100 | [diff] [blame] | 599 | } |