diff options
Diffstat (limited to 'openbsc/src/gprs/gprs_gmm.c')
| -rw-r--r-- | openbsc/src/gprs/gprs_gmm.c | 151 |
1 files changed, 141 insertions, 10 deletions
diff --git a/openbsc/src/gprs/gprs_gmm.c b/openbsc/src/gprs/gprs_gmm.c index d7ba5b4f5..07fd1dcfd 100644 --- a/openbsc/src/gprs/gprs_gmm.c +++ b/openbsc/src/gprs/gprs_gmm.c @@ -29,6 +29,7 @@ #include <netinet/in.h> #include <arpa/inet.h> +#include <netdb.h> #include <openbsc/db.h> #include <osmocom/core/msgb.h> @@ -37,6 +38,7 @@ #include <osmocom/core/signal.h> #include <osmocom/core/talloc.h> #include <osmocom/core/rate_ctr.h> +#include <osmocom/gsm/apn.h> #include <osmocom/gprs/gprs_bssgp.h> @@ -1633,7 +1635,7 @@ int gsm48_tx_gsm_deact_pdp_acc(struct sgsn_pdp_ctx *pdp) static int activate_ggsn(struct sgsn_mm_ctx *mmctx, struct sgsn_ggsn_ctx *ggsn, const uint8_t transaction_id, const uint8_t req_nsapi, const uint8_t req_llc_sapi, - struct tlv_parsed *tp) + struct tlv_parsed *tp, int destroy_ggsn) { struct sgsn_pdp_ctx *pdp; @@ -1646,10 +1648,94 @@ static int activate_ggsn(struct sgsn_mm_ctx *mmctx, /* Store SAPI and Transaction Identifier */ pdp->sapi = req_llc_sapi; pdp->ti = transaction_id; + pdp->destroy_ggsn = destroy_ggsn; return 0; } +static void ggsn_lookup_cb(void *arg, int status, int timeouts, struct hostent *hostent) +{ + struct sgsn_ggsn_ctx *ggsn; + struct sgsn_ggsn_lookup *lookup = arg; + struct in_addr *addr = NULL; + int i; + + /* The context is gone while we made a request */ + if (!lookup->mmctx) { + talloc_free(lookup); + return; + } + + if (status != ARES_SUCCESS) { + struct sgsn_mm_ctx *mmctx = lookup->mmctx; + + LOGMMCTXP(LOGL_ERROR, mmctx, "DNS query failed.\n"); + + /* Need to try with three digits now */ + if (lookup->state == SGSN_GGSN_2DIGIT) { + char *hostname; + int rc; + + lookup->state = SGSN_GGSN_3DIGIT; + hostname = osmo_apn_qualify_from_imsi(mmctx->imsi, + lookup->apn_str, 1); + LOGMMCTXP(LOGL_DEBUG, mmctx, + "Going to query %s\n", hostname); + rc = sgsn_ares_query(sgsn, hostname, + ggsn_lookup_cb, lookup); + if (rc != 0) { + LOGP(DGPRS, LOGL_ERROR, "Couldn't start GGSN\n"); + goto reject_due_failure; + } + return; + } + + LOGMMCTXP(LOGL_ERROR, mmctx, "Couldn't resolve GGSN\n"); + goto reject_due_failure; + } + + if (hostent->h_length != sizeof(struct in_addr)) { + LOGMMCTXP(LOGL_ERROR, lookup->mmctx, + "Wrong addr size(%d)\n", sizeof(struct in_addr)); + goto reject_due_failure; + } + + /* get the address */ + for (i = 0, addr = (struct in_addr *) hostent->h_addr_list[i]; addr; + i++, addr = (struct in_addr *) hostent->h_addr_list[i]) { + break; + } + + if (!addr) { + LOGMMCTXP(LOGL_ERROR, lookup->mmctx, "No host address.\n"); + goto reject_due_failure; + } + + ggsn = sgsn_ggsn_ctx_alloc(UINT32_MAX); + if (!ggsn) { + LOGMMCTXP(LOGL_ERROR, lookup->mmctx, "Failed to create ggsn.\n"); + goto reject_due_failure; + } + ggsn->remote_addr = *addr; + LOGMMCTXP(LOGL_NOTICE, lookup->mmctx, + "Selected %s as GGSN.\n", inet_ntoa(*addr)); + + /* forget about the ggsn look-up */ + lookup->mmctx->ggsn_lookup = NULL; + + activate_ggsn(lookup->mmctx, ggsn, lookup->ti, lookup->nsapi, + lookup->sapi, &lookup->tp, 1); + + /* Now free it */ + talloc_free(lookup); + return; + +reject_due_failure: + gsm48_tx_gsm_act_pdp_rej(lookup->mmctx, lookup->ti, + GMM_CAUSE_NET_FAIL, 0, NULL); + lookup->mmctx->ggsn_lookup = NULL; + talloc_free(lookup); +} static int do_act_pdp_req(struct sgsn_mm_ctx *mmctx, struct msgb *msg) { @@ -1662,6 +1748,9 @@ static int do_act_pdp_req(struct sgsn_mm_ctx *mmctx, struct msgb *msg) struct sgsn_ggsn_ctx *ggsn; struct sgsn_pdp_ctx *pdp; enum gsm48_gsm_cause gsm_cause; + char apn_str[GSM_APN_LENGTH] = { 0, }; + char *hostname; + int rc; LOGMMCTXP(LOGL_INFO, mmctx, "-> ACTIVATE PDP CONTEXT REQ: SAPI=%u NSAPI=%u ", act_req->req_llc_sapi, act_req->req_nsapi); @@ -1746,22 +1835,64 @@ static int do_act_pdp_req(struct sgsn_mm_ctx *mmctx, struct msgb *msg) 0, NULL); } + if (mmctx->ggsn_lookup) { + if (mmctx->ggsn_lookup->sapi == act_req->req_llc_sapi && + mmctx->ggsn_lookup->ti == transaction_id) { + LOGMMCTXP(LOGL_NOTICE, mmctx, + "Re-transmission while doing look-up. Ignoring.\n"); + return 0; + } + } + /* Only increment counter for a real activation, after we checked * for re-transmissions */ rate_ctr_inc(&mmctx->ctrg->ctr[GMM_CTR_PDP_CTX_ACT]); /* Determine GGSN based on APN and subscription options */ - ggsn = sgsn_mm_ctx_find_ggsn_ctx(mmctx, &tp, &gsm_cause); - if (!ggsn) { - LOGP(DGPRS, LOGL_ERROR, "No GGSN context found!\n"); - return gsm48_tx_gsm_act_pdp_rej(mmctx, transaction_id, - gsm_cause, 0, NULL); + ggsn = sgsn_mm_ctx_find_ggsn_ctx(mmctx, &tp, &gsm_cause, apn_str); + if (ggsn) + return activate_ggsn(mmctx, ggsn, transaction_id, + act_req->req_nsapi, act_req->req_llc_sapi, + &tp, 0); + + if (strlen(apn_str) == 0) + goto no_context; + if (!sgsn->cfg.dynamic_lookup) + goto no_context; + + /* schedule a dynamic look-up */ + mmctx->ggsn_lookup = talloc_zero(tall_bsc_ctx, struct sgsn_ggsn_lookup); + if (!mmctx->ggsn_lookup) + goto no_context; + + mmctx->ggsn_lookup->state = SGSN_GGSN_2DIGIT; + mmctx->ggsn_lookup->mmctx = mmctx; + strcpy(mmctx->ggsn_lookup->apn_str, apn_str); + + mmctx->ggsn_lookup->orig_msg = msg; + mmctx->ggsn_lookup->tp = tp; + + mmctx->ggsn_lookup->ti = transaction_id; + mmctx->ggsn_lookup->nsapi = act_req->req_nsapi; + mmctx->ggsn_lookup->sapi = act_req->req_llc_sapi; + + hostname = osmo_apn_qualify_from_imsi(mmctx->imsi, + mmctx->ggsn_lookup->apn_str, 0); + + LOGMMCTXP(LOGL_DEBUG, mmctx, "Going to query %s\n", hostname); + rc = sgsn_ares_query(sgsn, hostname, + ggsn_lookup_cb, mmctx->ggsn_lookup); + if (rc != 0) { + LOGMMCTXP(LOGL_ERROR, mmctx, "Failed to start ares query.\n"); + goto no_context; } - /* Now activate the GGSN */ - return activate_ggsn(mmctx, ggsn, transaction_id, - act_req->req_nsapi, act_req->req_llc_sapi, - &tp); + return 0; + +no_context: + LOGP(DGPRS, LOGL_ERROR, "No GGSN context found!\n"); + return gsm48_tx_gsm_act_pdp_rej(mmctx, transaction_id, + gsm_cause, 0, NULL); } /* Section 9.5.1: Activate PDP Context Request */ |