Harald Welte | 8f77f19 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 1 | /* GPRS SGSN integration with libgtp of OpenGGSN */ |
| 2 | |
| 3 | /* (C) 2010 by Harald Welte <laforge@gnumonks.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 | |
| 23 | #include <unistd.h> |
| 24 | #include <stdio.h> |
| 25 | #include <stdlib.h> |
| 26 | #include <string.h> |
| 27 | #include <getopt.h> |
| 28 | #include <errno.h> |
| 29 | #include <signal.h> |
| 30 | #include <sys/fcntl.h> |
| 31 | #include <sys/stat.h> |
| 32 | #include <sys/types.h> |
| 33 | #include <sys/socket.h> |
| 34 | #include <netinet/in.h> |
| 35 | #include <arpa/inet.h> |
| 36 | |
| 37 | #include <osmocore/talloc.h> |
| 38 | #include <osmocore/select.h> |
| 39 | #include <osmocore/rate_ctr.h> |
Harald Welte | 29d838e | 2010-05-18 10:35:06 +0200 | [diff] [blame] | 40 | #include <openbsc/gsm_04_08_gprs.h> |
Harald Welte | 8f77f19 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 41 | |
| 42 | #include <openbsc/signal.h> |
| 43 | #include <openbsc/debug.h> |
| 44 | #include <openbsc/sgsn.h> |
Harald Welte | 8f77f19 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 45 | #include <openbsc/gprs_sgsn.h> |
Harald Welte | 29d838e | 2010-05-18 10:35:06 +0200 | [diff] [blame] | 46 | #include <openbsc/gprs_gmm.h> |
Harald Welte | 8f77f19 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 47 | |
| 48 | #include <gtp.h> |
| 49 | #include <pdp.h> |
| 50 | |
Harald Welte | 8f77f19 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 51 | const struct value_string gtp_cause_strs[] = { |
| 52 | { GTPCAUSE_REQ_IMSI, "Request IMSI" }, |
| 53 | { GTPCAUSE_REQ_IMEI, "Request IMEI" }, |
| 54 | { GTPCAUSE_REQ_IMSI_IMEI, "Request IMSI and IMEI" }, |
| 55 | { GTPCAUSE_NO_ID_NEEDED, "No identity needed" }, |
| 56 | { GTPCAUSE_MS_REFUSES_X, "MS refuses" }, |
| 57 | { GTPCAUSE_MS_NOT_RESP_X, "MS is not GPRS responding" }, |
| 58 | { GTPCAUSE_ACC_REQ, "Request accepted" }, |
| 59 | { GTPCAUSE_NON_EXIST, "Non-existent" }, |
| 60 | { GTPCAUSE_INVALID_MESSAGE, "Invalid message format" }, |
| 61 | { GTPCAUSE_IMSI_NOT_KNOWN, "IMSI not known" }, |
| 62 | { GTPCAUSE_MS_DETACHED, "MS is GPRS detached" }, |
| 63 | { GTPCAUSE_MS_NOT_RESP, "MS is not GPRS responding" }, |
| 64 | { GTPCAUSE_MS_REFUSES, "MS refuses" }, |
| 65 | { GTPCAUSE_NO_RESOURCES, "No resources available" }, |
| 66 | { GTPCAUSE_NOT_SUPPORTED, "Service not supported" }, |
| 67 | { GTPCAUSE_MAN_IE_INCORRECT, "Mandatory IE incorrect" }, |
| 68 | { GTPCAUSE_MAN_IE_MISSING, "Mandatory IE missing" }, |
| 69 | { GTPCAUSE_OPT_IE_INCORRECT, "Optional IE incorrect" }, |
| 70 | { GTPCAUSE_SYS_FAIL, "System failure" }, |
| 71 | { GTPCAUSE_ROAMING_REST, "Roaming restrictions" }, |
| 72 | { GTPCAUSE_PTIMSI_MISMATCH, "P-TMSI Signature mismatch" }, |
| 73 | { GTPCAUSE_CONN_SUSP, "GPRS connection suspended" }, |
| 74 | { GTPCAUSE_AUTH_FAIL, "Authentication failure" }, |
| 75 | { GTPCAUSE_USER_AUTH_FAIL, "User authentication failed" }, |
| 76 | { GTPCAUSE_CONTEXT_NOT_FOUND, "Context not found" }, |
| 77 | { GTPCAUSE_ADDR_OCCUPIED, "All dynamic PDP addresses occupied" }, |
| 78 | { GTPCAUSE_NO_MEMORY, "No memory is available" }, |
| 79 | { GTPCAUSE_RELOC_FAIL, "Relocation failure" }, |
| 80 | { GTPCAUSE_UNKNOWN_MAN_EXTHEADER, "Unknown mandatory ext. header" }, |
| 81 | { GTPCAUSE_SEM_ERR_TFT, "Semantic error in TFT operation" }, |
| 82 | { GTPCAUSE_SYN_ERR_TFT, "Syntactic error in TFT operation" }, |
| 83 | { GTPCAUSE_SEM_ERR_FILTER, "Semantic errors in packet filter" }, |
| 84 | { GTPCAUSE_SYN_ERR_FILTER, "Syntactic errors in packet filter" }, |
| 85 | { GTPCAUSE_MISSING_APN, "Missing or unknown APN" }, |
| 86 | { GTPCAUSE_UNKNOWN_PDP, "Unknown PDP address or PDP type" }, |
| 87 | { 0, NULL } |
| 88 | }; |
| 89 | |
| 90 | /* generate a PDP context based on the IE's from the 04.08 message, |
| 91 | * and send the GTP create pdp context request to the GGSN */ |
Harald Welte | c1f6bfe | 2010-05-17 22:58:03 +0200 | [diff] [blame] | 92 | struct sgsn_pdp_ctx *sgsn_create_pdp_ctx(struct ggsn_ctx *ggsn, |
| 93 | struct sgsn_mm_ctx *mmctx, |
| 94 | uint16_t nsapi, |
| 95 | struct tlv_parsed *tp) |
Harald Welte | 8f77f19 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 96 | { |
Harald Welte | c1f6bfe | 2010-05-17 22:58:03 +0200 | [diff] [blame] | 97 | struct sgsn_pdp_ctx *pctx; |
Harald Welte | 8f77f19 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 98 | struct pdp_t *pdp; |
| 99 | uint64_t imsi_ui64; |
| 100 | int rc; |
| 101 | |
Harald Welte | c1f6bfe | 2010-05-17 22:58:03 +0200 | [diff] [blame] | 102 | pctx = sgsn_pdp_ctx_alloc(mmctx, nsapi); |
| 103 | if (!pctx) { |
| 104 | LOGP(DGPRS, LOGL_ERROR, "Couldn't allocate PDP Ctx\n"); |
| 105 | return NULL; |
| 106 | } |
| 107 | |
Harald Welte | 8f77f19 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 108 | rc = pdp_newpdp(&pdp, imsi_ui64, nsapi, NULL); |
| 109 | if (rc) { |
Harald Welte | c1f6bfe | 2010-05-17 22:58:03 +0200 | [diff] [blame] | 110 | LOGP(DGPRS, LOGL_ERROR, "Out of libgtp PDP Contexts\n"); |
| 111 | return NULL; |
Harald Welte | 8f77f19 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 112 | } |
Harald Welte | c1f6bfe | 2010-05-17 22:58:03 +0200 | [diff] [blame] | 113 | pctx->lib = pdp; |
| 114 | pctx->ggsn = ggsn; |
| 115 | |
Harald Welte | 8f77f19 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 116 | //pdp->peer = /* sockaddr_in of GGSN (receive) */ |
| 117 | //pdp->ipif = /* not used by library */ |
| 118 | pdp->version = ggsn->gtp_version; |
| 119 | pdp->hisaddr0 = ggsn->remote_addr; |
| 120 | pdp->hisaddr1 = ggsn->remote_addr; |
| 121 | //pdp->cch_pdp = 512; /* Charging Flat Rate */ |
| 122 | |
| 123 | /* MS provided APN, subscription not verified */ |
| 124 | pdp->selmode = 0x01; |
| 125 | |
| 126 | /* IMSI, TEID/TEIC, FLLU/FLLC, TID, NSAPI set in pdp_newpdp */ |
| 127 | |
| 128 | /* FIXME: MSISDN in BCD format from mmctx */ |
| 129 | //pdp->msisdn.l/.v |
| 130 | |
| 131 | /* End User Address from GMM requested PDP address */ |
| 132 | pdp->eua.l = TLVP_LEN(tp, OSMO_IE_GSM_REQ_PDP_ADDR); |
| 133 | if (pdp->eua.l > sizeof(pdp->eua.v)) |
| 134 | pdp->eua.l = sizeof(pdp->eua.v); |
| 135 | memcpy(pdp->eua.v, TLVP_VAL(tp, OSMO_IE_GSM_REQ_PDP_ADDR), |
| 136 | pdp->eua.l); |
| 137 | /* Highest 4 bits of first byte need to be set to 1, otherwise |
| 138 | * the IE is identical with the 04.08 PDP Address IE */ |
| 139 | pdp->eua.v[0] |= 0xf0; |
| 140 | |
| 141 | /* APN name from GMM */ |
| 142 | pdp->apn_use.l = TLVP_LEN(tp, GSM48_IE_GSM_APN); |
| 143 | if (pdp->apn_use.l > sizeof(pdp->apn_use.v)) |
| 144 | pdp->apn_use.l = sizeof(pdp->apn_use.v); |
| 145 | memcpy(pdp->apn_use.v, TLVP_VAL(tp, GSM48_IE_GSM_APN), |
| 146 | pdp->apn_use.l); |
| 147 | |
| 148 | /* Protocol Configuration Options from GMM */ |
| 149 | pdp->pco_req.l = TLVP_LEN(tp, GSM48_IE_GSM_PROTO_CONF_OPT); |
| 150 | if (pdp->pco_req.l > sizeof(pdp->pco_req.v)) |
| 151 | pdp->pco_req.l = sizeof(pdp->pco_req.v); |
| 152 | memcpy(pdp->pco_req.v, TLVP_VAL(tp, GSM48_IE_GSM_PROTO_CONF_OPT), |
| 153 | pdp->pco_req.l); |
| 154 | |
| 155 | /* QoS options from GMM */ |
| 156 | pdp->qos_req.l = TLVP_LEN(tp, OSMO_IE_GSM_REQ_QOS); |
| 157 | if (pdp->qos_req.l > sizeof(pdp->qos_req.v)) |
| 158 | pdp->qos_req.l = sizeof(pdp->qos_req.v); |
| 159 | memcpy(pdp->qos_req.v, TLVP_VAL(tp, OSMO_IE_GSM_REQ_QOS), |
| 160 | pdp->qos_req.l); |
| 161 | |
| 162 | /* SGSN address for control plane */ |
| 163 | pdp->gsnlc.l = sizeof(sgsn->cfg.gtp_listenaddr); |
| 164 | memcpy(pdp->gsnlc.v, &sgsn->cfg.gtp_listenaddr, |
| 165 | sizeof(sgsn->cfg.gtp_listenaddr)); |
| 166 | |
| 167 | /* SGSN address for user plane */ |
| 168 | pdp->gsnlu.l = sizeof(sgsn->cfg.gtp_listenaddr); |
| 169 | memcpy(pdp->gsnlu.v, &sgsn->cfg.gtp_listenaddr, |
| 170 | sizeof(sgsn->cfg.gtp_listenaddr)); |
| 171 | |
Harald Welte | 29d838e | 2010-05-18 10:35:06 +0200 | [diff] [blame] | 172 | /* change pdp state to 'requested' */ |
| 173 | pctx->state = PDP_STATE_CR_REQ; |
Harald Welte | 8f77f19 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 174 | |
Harald Welte | c1f6bfe | 2010-05-17 22:58:03 +0200 | [diff] [blame] | 175 | rc = gtp_create_context_req(ggsn->gsn, pdp, pctx); |
| 176 | /* FIXME */ |
| 177 | |
| 178 | return pctx; |
Harald Welte | 8f77f19 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 179 | } |
| 180 | |
Harald Welte | 29d838e | 2010-05-18 10:35:06 +0200 | [diff] [blame] | 181 | |
| 182 | struct cause_map { |
| 183 | uint8_t cause_in; |
| 184 | uint8_t cause_out; |
| 185 | }; |
| 186 | |
| 187 | static uint8_t cause_map(const struct cause_map *map, uint8_t in, uint8_t deflt) |
| 188 | { |
| 189 | const struct cause_map *m; |
| 190 | |
| 191 | for (m = map; m->cause_in && m->cause_out; m++) { |
| 192 | if (m->cause_in == in) |
| 193 | return m->cause_out; |
| 194 | } |
| 195 | return deflt; |
| 196 | } |
| 197 | |
| 198 | /* how do we map from gtp cause to SM cause */ |
| 199 | static const struct cause_map gtp2sm_cause_map[] = { |
| 200 | { GTPCAUSE_NO_RESOURCES, GSM_CAUSE_INSUFF_RSRC }, |
| 201 | { GTPCAUSE_NOT_SUPPORTED, GSM_CAUSE_SERV_OPT_NOTSUPP }, |
| 202 | { GTPCAUSE_MAN_IE_INCORRECT, GSM_CAUSE_INV_MAND_INFO }, |
| 203 | { GTPCAUSE_MAN_IE_MISSING, GSM_CAUSE_INV_MAND_INFO }, |
| 204 | { GTPCAUSE_OPT_IE_INCORRECT, GSM_CAUSE_PROTO_ERR_UNSPEC }, |
| 205 | { GTPCAUSE_SYS_FAIL, GSM_CAUSE_NET_FAIL }, |
| 206 | { GTPCAUSE_ROAMING_REST, GSM_CAUSE_REQ_SERV_OPT_NOTSUB }, |
| 207 | { GTPCAUSE_PTIMSI_MISMATCH, GSM_CAUSE_PROTO_ERR_UNSPEC }, |
| 208 | { GTPCAUSE_CONN_SUSP, GSM_CAUSE_PROTO_ERR_UNSPEC }, |
| 209 | { GTPCAUSE_AUTH_FAIL, GSM_CAUSE_AUTH_FAILED }, |
| 210 | { GTPCAUSE_USER_AUTH_FAIL, GSM_CAUSE_ACT_REJ_GGSN }, |
| 211 | { GTPCAUSE_CONTEXT_NOT_FOUND, GSM_CAUSE_PROTO_ERR_UNSPEC }, |
| 212 | { GTPCAUSE_ADDR_OCCUPIED, GSM_CAUSE_INSUFF_RSRC }, |
| 213 | { GTPCAUSE_NO_MEMORY, GSM_CAUSE_INSUFF_RSRC }, |
| 214 | { GTPCAUSE_RELOC_FAIL, GSM_CAUSE_PROTO_ERR_UNSPEC }, |
| 215 | { GTPCAUSE_UNKNOWN_MAN_EXTHEADER, GSM_CAUSE_PROTO_ERR_UNSPEC }, |
| 216 | { GTPCAUSE_MISSING_APN, GSM_CAUSE_MISSING_APN }, |
| 217 | { GTPCAUSE_UNKNOWN_PDP, GSM_CAUSE_UNKNOWN_PDP }, |
| 218 | { 0, 0 } |
| 219 | }; |
| 220 | |
Harald Welte | 8f77f19 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 221 | /* The GGSN has confirmed the creation of a PDP Context */ |
| 222 | static int create_pdp_conf(struct pdp_t *pdp, void *cbp, int cause) |
| 223 | { |
Harald Welte | c1f6bfe | 2010-05-17 22:58:03 +0200 | [diff] [blame] | 224 | struct sgsn_pdp_ctx *pctx = cbp; |
Harald Welte | 29d838e | 2010-05-18 10:35:06 +0200 | [diff] [blame] | 225 | uint8_t reject_cause; |
Harald Welte | 8f77f19 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 226 | |
| 227 | DEBUGP(DGPRS, "Received CREATE PDP CTX CONF, cause=%d(%s)\n", |
| 228 | cause, get_value_string(gtp_cause_strs, cause)); |
| 229 | |
| 230 | /* Check for cause value if it was really successful */ |
| 231 | if (cause < 0) { |
| 232 | LOGP(DGPRS, LOGL_NOTICE, "Create PDP ctx req timed out\n"); |
| 233 | if (pdp->version == 1) { |
| 234 | pdp->version = 0; |
Harald Welte | 17072d1 | 2010-05-17 00:53:10 +0200 | [diff] [blame] | 235 | gtp_create_context_req(sgsn->gsn, pdp, cbp); |
Harald Welte | 8f77f19 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 236 | return 0; |
| 237 | } else { |
Harald Welte | 29d838e | 2010-05-18 10:35:06 +0200 | [diff] [blame] | 238 | reject_cause = GSM_CAUSE_NET_FAIL; |
| 239 | goto reject; |
Harald Welte | 8f77f19 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 240 | } |
| 241 | } |
| 242 | |
| 243 | /* Check for cause value if it was really successful */ |
| 244 | if (cause != GTPCAUSE_ACC_REQ) { |
Harald Welte | 29d838e | 2010-05-18 10:35:06 +0200 | [diff] [blame] | 245 | reject_cause = cause_map(gtp2sm_cause_map, cause, |
| 246 | GSM_CAUSE_ACT_REJ_GGSN); |
| 247 | goto reject; |
Harald Welte | 8f77f19 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 248 | } |
| 249 | |
Harald Welte | 29d838e | 2010-05-18 10:35:06 +0200 | [diff] [blame] | 250 | /* Send PDP CTX ACT to MS */ |
| 251 | return gsm48_tx_gsm_act_pdp_acc(pctx); |
| 252 | |
| 253 | reject: |
| 254 | pctx->state = PDP_STATE_NONE; |
| 255 | pdp_freepdp(pdp); |
| 256 | sgsn_pdp_ctx_free(pctx); |
| 257 | /* Send PDP CTX ACT REJ to MS */ |
| 258 | return gsm48_tx_gsm_act_pdp_rej(pctx->mm, pdp->ti, reject_cause, |
| 259 | 0, NULL); |
| 260 | |
| 261 | return EOF; |
Harald Welte | 8f77f19 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 262 | } |
| 263 | |
| 264 | /* If we receive a 04.08 DEACT PDP CTX REQ or GPRS DETACH, we need to |
| 265 | * look-up the PDP context and request its deletion from the SGSN */ |
| 266 | int sgsn_delete_pdp_ctx(struct ggsn_ctx *ggsn, struct sgsn_mm_ctx *mmctx, |
| 267 | struct tlv_parsed *tp) |
| 268 | { |
| 269 | //return gtp_delete_context_req(gsn, pdp, cbp, teardown); |
| 270 | } |
| 271 | |
| 272 | /* Confirmation of a PDP Context Delete */ |
| 273 | static int delete_pdp_conf(struct pdp_t *pdp, int cause) |
| 274 | { |
| 275 | DEBUGP(DGPRS, "Received DELETE PDP CTX CONF, cause=%d(%s)\n", |
| 276 | cause, get_value_string(gtp_cause_strs, cause)); |
| 277 | return 0; |
| 278 | } |
| 279 | |
| 280 | /* Confirmation of an GTP ECHO request */ |
| 281 | static int echo_conf(int recovery) |
| 282 | { |
| 283 | if (recovery < 0) { |
| 284 | DEBUGP(DGPRS, "GTP Echo Request timed out\n"); |
| 285 | /* FIXME: if version == 1, retry with version 0 */ |
| 286 | } else { |
| 287 | DEBUGP(DGPRS, "GTP Rx Echo Response\n"); |
| 288 | } |
| 289 | return 0; |
| 290 | } |
| 291 | |
| 292 | /* libgtp callback for confirmations */ |
| 293 | static int cb_conf(int type, int cause, struct pdp_t *pdp, void *cbp) |
| 294 | { |
| 295 | DEBUGP(DGPRS, "libgtp cb_conf(type=%d, cause=%d, pdp=%p, cbp=%p)\n", |
| 296 | type, cause, pdp, cbp); |
| 297 | |
| 298 | if (cause == EOF) |
| 299 | LOGP(DGPRS, LOGL_ERROR, "libgtp EOF (type=%u, pdp=%p, cbp=%p)\n", |
| 300 | type, pdp, cbp); |
| 301 | |
| 302 | switch (type) { |
| 303 | case GTP_ECHO_REQ: |
| 304 | return echo_conf(cause); |
| 305 | case GTP_CREATE_PDP_REQ: |
| 306 | return create_pdp_conf(pdp, cbp, cause); |
| 307 | case GTP_DELETE_PDP_REQ: |
| 308 | return delete_pdp_conf(pdp, cause); |
| 309 | default: |
| 310 | break; |
| 311 | } |
| 312 | return 0; |
| 313 | } |
| 314 | |
| 315 | /* Called whenever a PDP context is deleted for any reason */ |
| 316 | static int cb_delete_context(struct pdp_t *pdp) |
| 317 | { |
| 318 | LOGP(DGPRS, LOGL_INFO, "PDP Context was deleted\n"); |
| 319 | return 0; |
| 320 | } |
| 321 | |
| 322 | /* Called when we receive a Version Not Supported message */ |
| 323 | static int cb_unsup_ind(struct sockaddr_in *peer) |
| 324 | { |
| 325 | LOGP(DGPRS, LOGL_INFO, "GTP Version not supported Indication " |
| 326 | "from %s:%u\n", inet_ntoa(peer->sin_addr), |
| 327 | ntohs(peer->sin_port)); |
| 328 | return 0; |
| 329 | } |
| 330 | |
| 331 | /* Called when we receive a Supported Ext Headers Notification */ |
| 332 | static int cb_extheader_ind(struct sockaddr_in *peer) |
| 333 | { |
| 334 | LOGP(DGPRS, LOGL_INFO, "GTP Supported Ext Headers Noficiation " |
| 335 | "from %s:%u\n", inet_ntoa(peer->sin_addr), |
| 336 | ntohs(peer->sin_port)); |
| 337 | return 0; |
| 338 | } |
| 339 | |
| 340 | /* Called whenever we recive a DATA packet */ |
| 341 | static int cb_data_ind(struct pdp_t *pdp, void *packet, unsigned int len) |
| 342 | { |
| 343 | DEBUGP(DGPRS, "GTP DATA IND from GGSN, length=%u\n", len); |
Harald Welte | 29d838e | 2010-05-18 10:35:06 +0200 | [diff] [blame] | 344 | /* FIXME: resolve PDP/MM context, forward to SNDCP layer */ |
Harald Welte | 8f77f19 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 345 | |
| 346 | return 0; |
| 347 | } |
| 348 | |
| 349 | /* libgtp select loop integration */ |
| 350 | static int sgsn_gtp_fd_cb(struct bsc_fd *fd, unsigned int what) |
| 351 | { |
| 352 | struct sgsn_instance *sgi = fd->data; |
| 353 | int rc; |
| 354 | |
| 355 | if (!(what & BSC_FD_READ)) |
| 356 | return 0; |
| 357 | |
| 358 | switch (fd->priv_nr) { |
| 359 | case 0: |
| 360 | rc = gtp_decaps0(sgi->gsn); |
| 361 | break; |
| 362 | case 1: |
| 363 | rc = gtp_decaps1c(sgi->gsn); |
| 364 | break; |
| 365 | case 2: |
| 366 | rc = gtp_decaps1u(sgi->gsn); |
| 367 | break; |
| 368 | } |
| 369 | return rc; |
| 370 | } |
| 371 | |
| 372 | static void timeval_normalize(struct timeval *tv) |
| 373 | { |
| 374 | unsigned int sec = tv->tv_usec / 1000000; |
| 375 | tv->tv_sec += sec; |
| 376 | tv->tv_usec -= sec * 1000000; |
| 377 | } |
| 378 | |
| 379 | /* diff = a - b */ |
| 380 | static int timeval_diff(struct timeval *diff, |
| 381 | struct timeval *a, |
| 382 | struct timeval *b) |
| 383 | { |
| 384 | /* Step 1: normalize input values */ |
| 385 | timeval_normalize(a); |
| 386 | timeval_normalize(b); |
| 387 | |
| 388 | if (b->tv_sec > a->tv_sec || |
| 389 | b->tv_sec == a->tv_sec && b->tv_usec > a->tv_usec) { |
| 390 | b->tv_sec = b->tv_usec = 0; |
| 391 | return -ERANGE; |
| 392 | } |
| 393 | |
| 394 | if (b->tv_usec > a->tv_usec) { |
| 395 | a->tv_sec -= 1; |
| 396 | a->tv_usec += 1000000; |
| 397 | } |
| 398 | |
| 399 | diff->tv_usec = a->tv_usec - b->tv_usec; |
| 400 | diff->tv_sec = a->tv_sec - b->tv_sec; |
| 401 | |
| 402 | return 0; |
| 403 | } |
| 404 | |
| 405 | static void sgsn_gtp_tmr_start(struct sgsn_instance *sgi) |
| 406 | { |
| 407 | struct timeval now, next, diff; |
| 408 | |
| 409 | /* Retrieve next retransmission as struct timeval */ |
| 410 | gtp_retranstimeout(sgi->gsn, &next); |
| 411 | |
| 412 | /* Calculate the difference to now */ |
| 413 | gettimeofday(&now, NULL); |
| 414 | timeval_diff(&diff, &next, &now); |
| 415 | |
| 416 | /* re-schedule the timer */ |
| 417 | bsc_schedule_timer(&sgi->gtp_timer, diff.tv_sec, diff.tv_usec/1000); |
| 418 | } |
| 419 | |
| 420 | /* timer callback for libgtp retransmissions and ping */ |
| 421 | static void sgsn_gtp_tmr_cb(void *data) |
| 422 | { |
| 423 | struct sgsn_instance *sgi = data; |
| 424 | |
| 425 | /* Do all the retransmissions as needed */ |
| 426 | gtp_retrans(sgi->gsn); |
| 427 | |
| 428 | sgsn_gtp_tmr_start(sgi); |
| 429 | } |
| 430 | |
| 431 | int sgsn_gtp_init(struct sgsn_instance *sgi) |
| 432 | { |
| 433 | int rc; |
| 434 | struct gsn_t *gsn; |
| 435 | |
| 436 | rc = gtp_new(&sgi->gsn, sgi->cfg.gtp_statedir, |
| 437 | &sgi->cfg.gtp_listenaddr.sin_addr, GTP_MODE_SGSN); |
| 438 | if (rc) { |
| 439 | LOGP(DGPRS, LOGL_ERROR, "Failed to create GTP: %d\n", rc); |
| 440 | return rc; |
| 441 | } |
| 442 | gsn = sgi->gsn; |
| 443 | |
| 444 | sgi->gtp_fd0.fd = gsn->fd0; |
| 445 | sgi->gtp_fd0.priv_nr = 0; |
| 446 | sgi->gtp_fd0.data = sgi; |
Harald Welte | 15bd924 | 2010-05-18 13:13:11 +0200 | [diff] [blame] | 447 | sgi->gtp_fd0.when = BSC_FD_READ; |
Harald Welte | 8f77f19 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 448 | sgi->gtp_fd0.cb = sgsn_gtp_fd_cb; |
| 449 | rc = bsc_register_fd(&sgi->gtp_fd0); |
| 450 | if (rc < 0) |
| 451 | return rc; |
| 452 | |
| 453 | sgi->gtp_fd1c.fd = gsn->fd1c; |
| 454 | sgi->gtp_fd1c.priv_nr = 1; |
| 455 | sgi->gtp_fd1c.data = sgi; |
Harald Welte | 15bd924 | 2010-05-18 13:13:11 +0200 | [diff] [blame] | 456 | sgi->gtp_fd1c.when = BSC_FD_READ; |
Harald Welte | 8f77f19 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 457 | sgi->gtp_fd1c.cb = sgsn_gtp_fd_cb; |
| 458 | bsc_register_fd(&sgi->gtp_fd1c); |
| 459 | if (rc < 0) |
| 460 | return rc; |
| 461 | |
| 462 | sgi->gtp_fd1u.fd = gsn->fd1u; |
| 463 | sgi->gtp_fd1u.priv_nr = 2; |
| 464 | sgi->gtp_fd1u.data = sgi; |
Harald Welte | 15bd924 | 2010-05-18 13:13:11 +0200 | [diff] [blame] | 465 | sgi->gtp_fd1u.when = BSC_FD_READ; |
Harald Welte | 8f77f19 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 466 | sgi->gtp_fd1u.cb = sgsn_gtp_fd_cb; |
| 467 | bsc_register_fd(&sgi->gtp_fd1u); |
| 468 | if (rc < 0) |
| 469 | return rc; |
| 470 | |
| 471 | /* Start GTP re-transmission timer */ |
| 472 | sgi->gtp_timer.cb = sgsn_gtp_tmr_cb; |
| 473 | sgsn_gtp_tmr_start(sgi); |
| 474 | |
| 475 | /* Register callbackcs with libgtp */ |
| 476 | gtp_set_cb_delete_context(gsn, cb_delete_context); |
| 477 | gtp_set_cb_conf(gsn, cb_conf); |
| 478 | gtp_set_cb_data_ind(gsn, cb_data_ind); |
| 479 | gtp_set_cb_unsup_ind(gsn, cb_unsup_ind); |
| 480 | gtp_set_cb_extheader_ind(gsn, cb_extheader_ind); |
| 481 | |
| 482 | return 0; |
| 483 | } |