/* GPRS SGSN integration with libgtp of OpenGGSN */ /* libgtp implements the GPRS Tunelling Protocol GTP per TS 09.60 / 29.060 */ /* (C) 2010 by Harald Welte * (C) 2010 by On-Waves * (C) 2015 by Holger Hans Peter Freyther * All Rights Reserved * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU Affero General Public License as published by * the Free Software Foundation; either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Affero General Public License for more details. * * You should have received a copy of the GNU Affero General Public License * along with this program. If not, see . * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include const struct value_string gtp_cause_strs[] = { { GTPCAUSE_REQ_IMSI, "Request IMSI" }, { GTPCAUSE_REQ_IMEI, "Request IMEI" }, { GTPCAUSE_REQ_IMSI_IMEI, "Request IMSI and IMEI" }, { GTPCAUSE_NO_ID_NEEDED, "No identity needed" }, { GTPCAUSE_MS_REFUSES_X, "MS refuses" }, { GTPCAUSE_MS_NOT_RESP_X, "MS is not GPRS responding" }, { GTPCAUSE_ACC_REQ, "Request accepted" }, { GTPCAUSE_NON_EXIST, "Non-existent" }, { GTPCAUSE_INVALID_MESSAGE, "Invalid message format" }, { GTPCAUSE_IMSI_NOT_KNOWN, "IMSI not known" }, { GTPCAUSE_MS_DETACHED, "MS is GPRS detached" }, { GTPCAUSE_MS_NOT_RESP, "MS is not GPRS responding" }, { GTPCAUSE_MS_REFUSES, "MS refuses" }, { GTPCAUSE_NO_RESOURCES, "No resources available" }, { GTPCAUSE_NOT_SUPPORTED, "Service not supported" }, { GTPCAUSE_MAN_IE_INCORRECT, "Mandatory IE incorrect" }, { GTPCAUSE_MAN_IE_MISSING, "Mandatory IE missing" }, { GTPCAUSE_OPT_IE_INCORRECT, "Optional IE incorrect" }, { GTPCAUSE_SYS_FAIL, "System failure" }, { GTPCAUSE_ROAMING_REST, "Roaming restrictions" }, { GTPCAUSE_PTIMSI_MISMATCH, "P-TMSI Signature mismatch" }, { GTPCAUSE_CONN_SUSP, "GPRS connection suspended" }, { GTPCAUSE_AUTH_FAIL, "Authentication failure" }, { GTPCAUSE_USER_AUTH_FAIL, "User authentication failed" }, { GTPCAUSE_CONTEXT_NOT_FOUND, "Context not found" }, { GTPCAUSE_ADDR_OCCUPIED, "All dynamic PDP addresses occupied" }, { GTPCAUSE_NO_MEMORY, "No memory is available" }, { GTPCAUSE_RELOC_FAIL, "Relocation failure" }, { GTPCAUSE_UNKNOWN_MAN_EXTHEADER, "Unknown mandatory ext. header" }, { GTPCAUSE_SEM_ERR_TFT, "Semantic error in TFT operation" }, { GTPCAUSE_SYN_ERR_TFT, "Syntactic error in TFT operation" }, { GTPCAUSE_SEM_ERR_FILTER, "Semantic errors in packet filter" }, { GTPCAUSE_SYN_ERR_FILTER, "Syntactic errors in packet filter" }, { GTPCAUSE_MISSING_APN, "Missing or unknown APN" }, { GTPCAUSE_UNKNOWN_PDP, "Unknown PDP address or PDP type" }, { 0, NULL } }; /* Generate the GTP IMSI IE according to 09.60 Section 7.9.2 */ static uint64_t imsi_str2gtp(char *str) { uint64_t imsi64 = 0; unsigned int n; unsigned int imsi_len = strlen(str); if (imsi_len > 16) { LOGP(DGPRS, LOGL_NOTICE, "IMSI length > 16 not supported!\n"); return 0; } for (n = 0; n < 16; n++) { uint64_t val; if (n < imsi_len) val = (str[n]-'0') & 0xf; else val = 0xf; imsi64 |= (val << (n*4)); } return imsi64; } /* generate a PDP context based on the IE's from the 04.08 message, * and send the GTP create pdp context request to the GGSN */ struct sgsn_pdp_ctx *sgsn_create_pdp_ctx(struct sgsn_ggsn_ctx *ggsn, struct sgsn_mm_ctx *mmctx, uint16_t nsapi, struct tlv_parsed *tp) { struct gprs_ra_id raid; struct sgsn_pdp_ctx *pctx; struct pdp_t *pdp; uint64_t imsi_ui64; size_t qos_len; const uint8_t *qos; int rc; LOGP(DGPRS, LOGL_ERROR, "Create PDP Context\n"); pctx = sgsn_pdp_ctx_alloc(mmctx, nsapi); if (!pctx) { LOGP(DGPRS, LOGL_ERROR, "Couldn't allocate PDP Ctx\n"); return NULL; } imsi_ui64 = imsi_str2gtp(mmctx->imsi); rc = pdp_newpdp(&pdp, imsi_ui64, nsapi, NULL); if (rc) { LOGP(DGPRS, LOGL_ERROR, "Out of libgtp PDP Contexts\n"); return NULL; } pdp->priv = pctx; pctx->lib = pdp; pctx->ggsn = ggsn; //pdp->peer = /* sockaddr_in of GGSN (receive) */ //pdp->ipif = /* not used by library */ pdp->version = ggsn->gtp_version; pdp->hisaddr0 = ggsn->remote_addr; pdp->hisaddr1 = ggsn->remote_addr; //pdp->cch_pdp = 512; /* Charging Flat Rate */ /* MS provided APN, subscription was verified by the caller */ pdp->selmode = 0xFC | 0x00; /* IMSI, TEID/TEIC, FLLU/FLLC, TID, NSAPI set in pdp_newpdp */ /* Put the MSISDN in case we have it */ if (mmctx->subscr) { pdp->msisdn.l = mmctx->subscr->sgsn_data->msisdn_len; if (pdp->msisdn.l > sizeof(pdp->msisdn.v)) pdp->msisdn.l = sizeof(pdp->msisdn.v); memcpy(pdp->msisdn.v, mmctx->subscr->sgsn_data->msisdn, pdp->msisdn.l); } /* End User Address from GMM requested PDP address */ pdp->eua.l = TLVP_LEN(tp, OSMO_IE_GSM_REQ_PDP_ADDR); if (pdp->eua.l > sizeof(pdp->eua.v)) pdp->eua.l = sizeof(pdp->eua.v); memcpy(pdp->eua.v, TLVP_VAL(tp, OSMO_IE_GSM_REQ_PDP_ADDR), pdp->eua.l); /* Highest 4 bits of first byte need to be set to 1, otherwise * the IE is identical with the 04.08 PDP Address IE */ pdp->eua.v[0] |= 0xf0; /* APN name from GMM */ pdp->apn_use.l = TLVP_LEN(tp, GSM48_IE_GSM_APN); if (pdp->apn_use.l > sizeof(pdp->apn_use.v)) pdp->apn_use.l = sizeof(pdp->apn_use.v); memcpy(pdp->apn_use.v, TLVP_VAL(tp, GSM48_IE_GSM_APN), pdp->apn_use.l); /* Protocol Configuration Options from GMM */ pdp->pco_req.l = TLVP_LEN(tp, GSM48_IE_GSM_PROTO_CONF_OPT); if (pdp->pco_req.l > sizeof(pdp->pco_req.v)) pdp->pco_req.l = sizeof(pdp->pco_req.v); memcpy(pdp->pco_req.v, TLVP_VAL(tp, GSM48_IE_GSM_PROTO_CONF_OPT), pdp->pco_req.l); /* QoS options from GMM or remote */ if (TLVP_LEN(tp, OSMO_IE_GSM_SUB_QOS) > 0) { qos_len = TLVP_LEN(tp, OSMO_IE_GSM_SUB_QOS); qos = TLVP_VAL(tp, OSMO_IE_GSM_SUB_QOS); } else { qos_len = TLVP_LEN(tp, OSMO_IE_GSM_REQ_QOS); qos = TLVP_VAL(tp, OSMO_IE_GSM_REQ_QOS); } if (qos_len <= 3) { pdp->qos_req.l = qos_len + 1; if (pdp->qos_req.l > sizeof(pdp->qos_req.v)) pdp->qos_req.l = sizeof(pdp->qos_req.v); pdp->qos_req.v[0] = 0; /* Allocation/Retention policy */ memcpy(&pdp->qos_req.v[1], qos, pdp->qos_req.l - 1); } else { pdp->qos_req.l = qos_len; if (pdp->qos_req.l > sizeof(pdp->qos_req.v)) pdp->qos_req.l = sizeof(pdp->qos_req.v); memcpy(pdp->qos_req.v, qos, pdp->qos_req.l); } /* SGSN address for control plane */ pdp->gsnlc.l = sizeof(sgsn->cfg.gtp_listenaddr.sin_addr); memcpy(pdp->gsnlc.v, &sgsn->cfg.gtp_listenaddr.sin_addr, sizeof(sgsn->cfg.gtp_listenaddr.sin_addr)); /* SGSN address for user plane */ pdp->gsnlu.l = sizeof(sgsn->cfg.gtp_listenaddr.sin_addr); memcpy(pdp->gsnlu.v, &sgsn->cfg.gtp_listenaddr.sin_addr, sizeof(sgsn->cfg.gtp_listenaddr.sin_addr)); /* Assume we are a GERAN system */ pdp->rattype.l = 1; pdp->rattype.v[0] = 2; pdp->rattype_given = 1; /* Include RAI and ULI all the time */ pdp->rai_given = 1; pdp->rai.l = 6; raid = mmctx->ra; raid.lac = 0xFFFE; raid.rac = 0xFF; gsm48_construct_ra(pdp->rai.v, &raid); pdp->userloc_given = 1; pdp->userloc.l = 8; pdp->userloc.v[0] = 0; /* CGI for GERAN */ bssgp_create_cell_id(&pdp->userloc.v[1], &mmctx->ra, mmctx->cell_id); /* include the IMEI(SV) */ pdp->imeisv_given = 1; gsm48_encode_bcd_number(&pdp->imeisv.v[0], 8, 0, mmctx->imei); pdp->imeisv.l = pdp->imeisv.v[0]; memmove(&pdp->imeisv.v[0], &pdp->imeisv.v[1], 8); /* change pdp state to 'requested' */ pctx->state = PDP_STATE_CR_REQ; rc = gtp_create_context_req(ggsn->gsn, pdp, pctx); /* FIXME */ return pctx; } /* SGSN wants to delete a PDP context */ int sgsn_delete_pdp_ctx(struct sgsn_pdp_ctx *pctx) { LOGPDPCTXP(LOGL_ERROR, pctx, "Delete PDP Context\n"); /* FIXME: decide if we need teardown or not ! */ return gtp_delete_context_req(pctx->ggsn->gsn, pctx->lib, pctx, 1); } struct cause_map { uint8_t cause_in; uint8_t cause_out; }; static uint8_t cause_map(const struct cause_map *map, uint8_t in, uint8_t deflt) { const struct cause_map *m; for (m = map; m->cause_in && m->cause_out; m++) { if (m->cause_in == in) return m->cause_out; } return deflt; } /* how do we map from gtp cause to SM cause */ static const struct cause_map gtp2sm_cause_map[] = { { GTPCAUSE_NO_RESOURCES, GSM_CAUSE_INSUFF_RSRC }, { GTPCAUSE_NOT_SUPPORTED, GSM_CAUSE_SERV_OPT_NOTSUPP }, { GTPCAUSE_MAN_IE_INCORRECT, GSM_CAUSE_INV_MAND_INFO }, { GTPCAUSE_MAN_IE_MISSING, GSM_CAUSE_INV_MAND_INFO }, { GTPCAUSE_OPT_IE_INCORRECT, GSM_CAUSE_PROTO_ERR_UNSPEC }, { GTPCAUSE_SYS_FAIL, GSM_CAUSE_NET_FAIL }, { GTPCAUSE_ROAMING_REST, GSM_CAUSE_REQ_SERV_OPT_NOTSUB }, { GTPCAUSE_PTIMSI_MISMATCH, GSM_CAUSE_PROTO_ERR_UNSPEC }, { GTPCAUSE_CONN_SUSP, GSM_CAUSE_PROTO_ERR_UNSPEC }, { GTPCAUSE_AUTH_FAIL, GSM_CAUSE_AUTH_FAILED }, { GTPCAUSE_USER_AUTH_FAIL, GSM_CAUSE_ACT_REJ_GGSN }, { GTPCAUSE_CONTEXT_NOT_FOUND, GSM_CAUSE_PROTO_ERR_UNSPEC }, { GTPCAUSE_ADDR_OCCUPIED, GSM_CAUSE_INSUFF_RSRC }, { GTPCAUSE_NO_MEMORY, GSM_CAUSE_INSUFF_RSRC }, { GTPCAUSE_RELOC_FAIL, GSM_CAUSE_PROTO_ERR_UNSPEC }, { GTPCAUSE_UNKNOWN_MAN_EXTHEADER, GSM_CAUSE_PROTO_ERR_UNSPEC }, { GTPCAUSE_MISSING_APN, GSM_CAUSE_MISSING_APN }, { GTPCAUSE_UNKNOWN_PDP, GSM_CAUSE_UNKNOWN_PDP }, { 0, 0 } }; /* The GGSN has confirmed the creation of a PDP Context */ static int create_pdp_conf(struct pdp_t *pdp, void *cbp, int cause) { struct sgsn_signal_data sig_data; struct sgsn_pdp_ctx *pctx = cbp; uint8_t reject_cause; LOGPDPCTXP(LOGL_INFO, pctx, "Received CREATE PDP CTX CONF, cause=%d(%s)\n", cause, get_value_string(gtp_cause_strs, cause)); if (!pctx->mm) { LOGP(DGPRS, LOGL_INFO, "No MM context, aborting CREATE PDP CTX CONF\n"); return -EIO; } /* Check for cause value if it was really successful */ if (cause < 0) { LOGP(DGPRS, LOGL_NOTICE, "Create PDP ctx req timed out\n"); if (pdp && pdp->version == 1) { pdp->version = 0; gtp_create_context_req(sgsn->gsn, pdp, cbp); return 0; } else { reject_cause = GSM_CAUSE_NET_FAIL; goto reject; } } /* Check for cause value if it was really successful */ if (cause != GTPCAUSE_ACC_REQ) { reject_cause = cause_map(gtp2sm_cause_map, cause, GSM_CAUSE_ACT_REJ_GGSN); goto reject; } /* Activate the SNDCP layer */ sndcp_sm_activate_ind(&pctx->mm->llme->lle[pctx->sapi], pctx->nsapi); /* Inform others about it */ memset(&sig_data, 0, sizeof(sig_data)); sig_data.pdp = pctx; osmo_signal_dispatch(SS_SGSN, S_SGSN_PDP_ACT, &sig_data); /* Send PDP CTX ACT to MS */ return gsm48_tx_gsm_act_pdp_acc(pctx); reject: /* * In case of a timeout pdp will be NULL but we have a valid pointer * in pctx->lib. For other rejects pctx->lib and pdp might be the * same. */ pctx->state = PDP_STATE_NONE; if (pctx->lib && pctx->lib != pdp) pdp_freepdp(pctx->lib); pctx->lib = NULL; if (pdp) pdp_freepdp(pdp); /* Send PDP CTX ACT REJ to MS */ gsm48_tx_gsm_act_pdp_rej(pctx->mm, pctx->ti, reject_cause, 0, NULL); sgsn_pdp_ctx_free(pctx); return EOF; } /* Confirmation of a PDP Context Delete */ static int delete_pdp_conf(struct pdp_t *pdp, void *cbp, int cause) { struct sgsn_signal_data sig_data; struct sgsn_pdp_ctx *pctx = cbp; int rc = 0; LOGPDPCTXP(LOGL_INFO, pctx, "Received DELETE PDP CTX CONF, cause=%d(%s)\n", cause, get_value_string(gtp_cause_strs, cause)); memset(&sig_data, 0, sizeof(sig_data)); sig_data.pdp = pctx; osmo_signal_dispatch(SS_SGSN, S_SGSN_PDP_DEACT, &sig_data); if (pctx->mm) { /* Deactivate the SNDCP layer */ sndcp_sm_deactivate_ind(&pctx->mm->llme->lle[pctx->sapi], pctx->nsapi); /* Confirm deactivation of PDP context to MS */ rc = gsm48_tx_gsm_deact_pdp_acc(pctx); } else { LOGPDPCTXP(LOGL_NOTICE, pctx, "Not deactivating SNDCP layer since the MM context " "is not available\n"); } /* unlink the now non-existing library handle from the pdp * context */ pctx->lib = NULL; sgsn_pdp_ctx_free(pctx); return rc; } /* Confirmation of an GTP ECHO request */ static int echo_conf(struct pdp_t *pdp, void *cbp, int recovery) { if (recovery < 0) { LOGP(DGPRS, LOGL_NOTICE, "GTP Echo Request timed out\n"); /* FIXME: if version == 1, retry with version 0 */ } else { DEBUGP(DGPRS, "GTP Rx Echo Response\n"); } return 0; } /* Any message received by GGSN contains a recovery IE */ static int cb_recovery(struct sockaddr_in *peer, uint8_t recovery) { struct sgsn_ggsn_ctx *ggsn; ggsn = sgsn_ggsn_ctx_by_addr(&peer->sin_addr); if (!ggsn) { LOGP(DGPRS, LOGL_NOTICE, "Received Recovery IE for unknown GGSN\n"); return -EINVAL; } if (ggsn->remote_restart_ctr == -1) { /* First received ECHO RESPONSE, note the restart ctr */ ggsn->remote_restart_ctr = recovery; } else if (ggsn->remote_restart_ctr != recovery) { /* counter has changed (GGSN restart): release all PDP */ LOGP(DGPRS, LOGL_NOTICE, "GGSN recovery (%u->%u), " "releasing all PDP contexts\n", ggsn->remote_restart_ctr, recovery); ggsn->remote_restart_ctr = recovery; drop_all_pdp_for_ggsn(ggsn); } return 0; } /* libgtp callback for confirmations */ static int cb_conf(int type, int cause, struct pdp_t *pdp, void *cbp) { DEBUGP(DGPRS, "libgtp cb_conf(type=%d, cause=%d, pdp=%p, cbp=%p)\n", type, cause, pdp, cbp); if (cause == EOF) LOGP(DGPRS, LOGL_ERROR, "libgtp EOF (type=%u, pdp=%p, cbp=%p)\n", type, pdp, cbp); switch (type) { case GTP_ECHO_REQ: /* libgtp hands us the RECOVERY number instead of a cause */ return echo_conf(pdp, cbp, cause); case GTP_CREATE_PDP_REQ: return create_pdp_conf(pdp, cbp, cause); case GTP_DELETE_PDP_REQ: return delete_pdp_conf(pdp, cbp, cause); default: break; } return 0; } /* Called whenever a PDP context is deleted for any reason */ static int cb_delete_context(struct pdp_t *pdp) { LOGP(DGPRS, LOGL_INFO, "PDP Context was deleted\n"); return 0; } /* Called when we receive a Version Not Supported message */ static int cb_unsup_ind(struct sockaddr_in *peer) { LOGP(DGPRS, LOGL_INFO, "GTP Version not supported Indication " "from %s:%u\n", inet_ntoa(peer->sin_addr), ntohs(peer->sin_port)); return 0; } /* Called when we receive a Supported Ext Headers Notification */ static int cb_extheader_ind(struct sockaddr_in *peer) { LOGP(DGPRS, LOGL_INFO, "GTP Supported Ext Headers Noficiation " "from %s:%u\n", inet_ntoa(peer->sin_addr), ntohs(peer->sin_port)); return 0; } /* Called whenever we recive a DATA packet */ static int cb_data_ind(struct pdp_t *lib, void *packet, unsigned int len) { struct bssgp_paging_info pinfo; struct sgsn_pdp_ctx *pdp; struct sgsn_mm_ctx *mm; struct msgb *msg; uint8_t *ud; DEBUGP(DGPRS, "GTP DATA IND from GGSN, length=%u\n", len); pdp = lib->priv; if (!pdp) { LOGP(DGPRS, LOGL_NOTICE, "GTP DATA IND from GGSN for unknown PDP\n"); return -EIO; } mm = pdp->mm; if (!mm) { LOGP(DGPRS, LOGL_ERROR, "PDP context (imsi=%s) without MM context!\n", mm->imsi); return -EIO; } msg = msgb_alloc_headroom(len+256, 128, "GTP->SNDCP"); ud = msgb_put(msg, len); memcpy(ud, packet, len); msgb_tlli(msg) = mm->tlli; msgb_bvci(msg) = mm->bvci; msgb_nsei(msg) = mm->nsei; switch (mm->mm_state) { case GMM_REGISTERED_SUSPENDED: /* initiate PS PAGING procedure */ memset(&pinfo, 0, sizeof(pinfo)); pinfo.mode = BSSGP_PAGING_PS; pinfo.scope = BSSGP_PAGING_BVCI; pinfo.bvci = mm->bvci; pinfo.imsi = mm->imsi; pinfo.ptmsi = &mm->p_tmsi; pinfo.drx_params = mm->drx_parms; pinfo.qos[0] = 0; // FIXME bssgp_tx_paging(mm->nsei, 0, &pinfo); rate_ctr_inc(&mm->ctrg->ctr[GMM_CTR_PAGING_PS]); /* FIXME: queue the packet we received from GTP */ break; case GMM_REGISTERED_NORMAL: break; default: LOGP(DGPRS, LOGL_ERROR, "GTP DATA IND for TLLI %08X in state " "%u\n", mm->tlli, mm->mm_state); msgb_free(msg); return -1; } rate_ctr_inc(&pdp->ctrg->ctr[PDP_CTR_PKTS_UDATA_OUT]); rate_ctr_add(&pdp->ctrg->ctr[PDP_CTR_BYTES_UDATA_OUT], len); rate_ctr_inc(&mm->ctrg->ctr[GMM_CTR_PKTS_UDATA_OUT]); rate_ctr_add(&mm->ctrg->ctr[GMM_CTR_BYTES_UDATA_OUT], len); /* It is easier to have a global count */ pdp->cdr_bytes_out += len; return sndcp_unitdata_req(msg, &mm->llme->lle[pdp->sapi], pdp->nsapi, mm); } /* Called by SNDCP when it has received/re-assembled a N-PDU */ int sgsn_rx_sndcp_ud_ind(struct gprs_ra_id *ra_id, int32_t tlli, uint8_t nsapi, struct msgb *msg, uint32_t npdu_len, uint8_t *npdu) { struct sgsn_mm_ctx *mmctx; struct sgsn_pdp_ctx *pdp; /* look-up the MM context for this message */ mmctx = sgsn_mm_ctx_by_tlli(tlli, ra_id); if (!mmctx) { LOGP(DGPRS, LOGL_ERROR, "Cannot find MM CTX for TLLI %08x\n", tlli); return -EIO; } /* look-up the PDP context for this message */ pdp = sgsn_pdp_ctx_by_nsapi(mmctx, nsapi); if (!pdp) { LOGP(DGPRS, LOGL_ERROR, "Cannot find PDP CTX for " "TLLI=%08x, NSAPI=%u\n", tlli, nsapi); return -EIO; } if (!pdp->lib) { LOGP(DGPRS, LOGL_ERROR, "PDP CTX without libgtp\n"); return -EIO; } rate_ctr_inc(&pdp->ctrg->ctr[PDP_CTR_PKTS_UDATA_IN]); rate_ctr_add(&pdp->ctrg->ctr[PDP_CTR_BYTES_UDATA_IN], npdu_len); rate_ctr_inc(&mmctx->ctrg->ctr[GMM_CTR_PKTS_UDATA_IN]); rate_ctr_add(&mmctx->ctrg->ctr[GMM_CTR_BYTES_UDATA_IN], npdu_len); /* It is easier to have a global count */ pdp->cdr_bytes_in += npdu_len; return gtp_data_req(pdp->ggsn->gsn, pdp->lib, npdu, npdu_len); } /* libgtp select loop integration */ static int sgsn_gtp_fd_cb(struct osmo_fd *fd, unsigned int what) { struct sgsn_instance *sgi = fd->data; int rc; if (!(what & BSC_FD_READ)) return 0; switch (fd->priv_nr) { case 0: rc = gtp_decaps0(sgi->gsn); break; case 1: rc = gtp_decaps1c(sgi->gsn); break; case 2: rc = gtp_decaps1u(sgi->gsn); break; default: rc = -EINVAL; break; } return rc; } static void sgsn_gtp_tmr_start(struct sgsn_instance *sgi) { struct timeval next; /* Retrieve next retransmission as struct timeval */ gtp_retranstimeout(sgi->gsn, &next); /* re-schedule the timer */ osmo_timer_schedule(&sgi->gtp_timer, next.tv_sec, next.tv_usec/1000); } /* timer callback for libgtp retransmissions and ping */ static void sgsn_gtp_tmr_cb(void *data) { struct sgsn_instance *sgi = data; /* Do all the retransmissions as needed */ gtp_retrans(sgi->gsn); sgsn_gtp_tmr_start(sgi); } int sgsn_gtp_init(struct sgsn_instance *sgi) { int rc; struct gsn_t *gsn; rc = gtp_new(&sgi->gsn, sgi->cfg.gtp_statedir, &sgi->cfg.gtp_listenaddr.sin_addr, GTP_MODE_SGSN); if (rc) { LOGP(DGPRS, LOGL_ERROR, "Failed to create GTP: %d\n", rc); return rc; } gsn = sgi->gsn; sgi->gtp_fd0.fd = gsn->fd0; sgi->gtp_fd0.priv_nr = 0; sgi->gtp_fd0.data = sgi; sgi->gtp_fd0.when = BSC_FD_READ; sgi->gtp_fd0.cb = sgsn_gtp_fd_cb; rc = osmo_fd_register(&sgi->gtp_fd0); if (rc < 0) return rc; sgi->gtp_fd1c.fd = gsn->fd1c; sgi->gtp_fd1c.priv_nr = 1; sgi->gtp_fd1c.data = sgi; sgi->gtp_fd1c.when = BSC_FD_READ; sgi->gtp_fd1c.cb = sgsn_gtp_fd_cb; rc = osmo_fd_register(&sgi->gtp_fd1c); if (rc < 0) { osmo_fd_unregister(&sgi->gtp_fd0); return rc; } sgi->gtp_fd1u.fd = gsn->fd1u; sgi->gtp_fd1u.priv_nr = 2; sgi->gtp_fd1u.data = sgi; sgi->gtp_fd1u.when = BSC_FD_READ; sgi->gtp_fd1u.cb = sgsn_gtp_fd_cb; rc = osmo_fd_register(&sgi->gtp_fd1u); if (rc < 0) { osmo_fd_unregister(&sgi->gtp_fd0); osmo_fd_unregister(&sgi->gtp_fd1c); return rc; } /* Start GTP re-transmission timer */ sgi->gtp_timer.cb = sgsn_gtp_tmr_cb; sgi->gtp_timer.data = sgi; sgsn_gtp_tmr_start(sgi); /* Register callbackcs with libgtp */ gtp_set_cb_delete_context(gsn, cb_delete_context); gtp_set_cb_conf(gsn, cb_conf); gtp_set_cb_recovery(gsn, cb_recovery); gtp_set_cb_data_ind(gsn, cb_data_ind); gtp_set_cb_unsup_ind(gsn, cb_unsup_ind); gtp_set_cb_extheader_ind(gsn, cb_extheader_ind); return 0; }