| /* 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 <laforge@gnumonks.org> |
| * (C) 2010 by On-Waves |
| * 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 <http://www.gnu.org/licenses/>. |
| * |
| */ |
| |
| #include <unistd.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <getopt.h> |
| #include <errno.h> |
| #include <signal.h> |
| #include <sys/fcntl.h> |
| #include <sys/stat.h> |
| #include <sys/socket.h> |
| #include <netinet/in.h> |
| #include <arpa/inet.h> |
| |
| #include <osmocom/core/talloc.h> |
| #include <osmocom/core/select.h> |
| #include <osmocom/core/rate_ctr.h> |
| #include <osmocom/gprs/gprs_bssgp.h> |
| |
| #include <openbsc/gsm_04_08_gprs.h> |
| #include <openbsc/signal.h> |
| #include <openbsc/debug.h> |
| #include <openbsc/sgsn.h> |
| #include <openbsc/gprs_llc.h> |
| #include <openbsc/gprs_sgsn.h> |
| #include <openbsc/gprs_gmm.h> |
| |
| #include <gtp.h> |
| #include <pdp.h> |
| |
| 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 sgsn_pdp_ctx *pctx; |
| struct pdp_t *pdp; |
| uint64_t imsi_ui64; |
| 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 not verified */ |
| pdp->selmode = 0x01; |
| |
| /* IMSI, TEID/TEIC, FLLU/FLLC, TID, NSAPI set in pdp_newpdp */ |
| |
| /* FIXME: MSISDN in BCD format from mmctx */ |
| //pdp->msisdn.l/.v |
| |
| /* 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 */ |
| pdp->qos_req.l = TLVP_LEN(tp, OSMO_IE_GSM_REQ_QOS); |
| if (pdp->qos_req.l > sizeof(pdp->qos_req.v)) |
| pdp->qos_req.l = sizeof(pdp->qos_req.v); |
| memcpy(pdp->qos_req.v, TLVP_VAL(tp, OSMO_IE_GSM_REQ_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)); |
| |
| /* 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) |
| { |
| LOGP(DGPRS, LOGL_ERROR, "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_pdp_ctx *pctx = cbp; |
| uint8_t reject_cause; |
| int rc; |
| |
| DEBUGP(DGPRS, "Received CREATE PDP CTX CONF, cause=%d(%s)\n", |
| cause, get_value_string(gtp_cause_strs, cause)); |
| |
| /* 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); |
| |
| /* 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 */ |
| rc = 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_pdp_ctx *pctx = cbp; |
| int rc; |
| |
| DEBUGP(DGPRS, "Received DELETE PDP CTX CONF, cause=%d(%s)\n", |
| cause, get_value_string(gtp_cause_strs, cause)); |
| |
| /* 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); |
| |
| /* 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) { |
| DEBUGP(DGPRS, "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) { |
| DEBUGP(DGPRS, "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; |
| int rc; |
| |
| 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 |
| rc = 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); |
| |
| 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); |
| |
| 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; |
| } |