| /* NS-over-IP proxy */ |
| |
| /* (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 <sys/fcntl.h> |
| #include <sys/stat.h> |
| #include <arpa/inet.h> |
| |
| #include <osmocom/core/talloc.h> |
| #include <osmocom/core/select.h> |
| |
| #include <osmocom/gprs/gprs_ns.h> |
| #include <osmocom/gprs/gprs_bssgp.h> |
| |
| #include <openbsc/signal.h> |
| #include <openbsc/debug.h> |
| #include <openbsc/gb_proxy.h> |
| |
| struct gbprox_peer { |
| struct llist_head list; |
| |
| /* NS-VC over which we send/receive data to this BVC */ |
| struct gprs_nsvc *nsvc; |
| |
| /* BVCI used for Point-to-Point to this peer */ |
| uint16_t bvci; |
| int blocked; |
| |
| /* Routeing Area that this peer is part of (raw 04.08 encoding) */ |
| uint8_t ra[6]; |
| }; |
| |
| /* Linked list of all Gb peers (except SGSN) */ |
| static LLIST_HEAD(gbprox_bts_peers); |
| |
| /* Find the gbprox_peer by its BVCI */ |
| static struct gbprox_peer *peer_by_bvci(uint16_t bvci) |
| { |
| struct gbprox_peer *peer; |
| llist_for_each_entry(peer, &gbprox_bts_peers, list) { |
| if (peer->bvci == bvci) |
| return peer; |
| } |
| return NULL; |
| } |
| |
| static struct gbprox_peer *peer_by_nsvc(struct gprs_nsvc *nsvc) |
| { |
| struct gbprox_peer *peer; |
| llist_for_each_entry(peer, &gbprox_bts_peers, list) { |
| if (peer->nsvc == nsvc) |
| return peer; |
| } |
| return NULL; |
| } |
| |
| /* look-up a peer by its Routeing Area Code (RAC) */ |
| static struct gbprox_peer *peer_by_rac(const uint8_t *ra) |
| { |
| struct gbprox_peer *peer; |
| llist_for_each_entry(peer, &gbprox_bts_peers, list) { |
| if (!memcmp(peer->ra, ra, 6)) |
| return peer; |
| } |
| return NULL; |
| } |
| |
| /* look-up a peer by its Location Area Code (LAC) */ |
| static struct gbprox_peer *peer_by_lac(const uint8_t *la) |
| { |
| struct gbprox_peer *peer; |
| llist_for_each_entry(peer, &gbprox_bts_peers, list) { |
| if (!memcmp(peer->ra, la, 5)) |
| return peer; |
| } |
| return NULL; |
| } |
| |
| static struct gbprox_peer *peer_alloc(uint16_t bvci) |
| { |
| struct gbprox_peer *peer; |
| |
| peer = talloc_zero(tall_bsc_ctx, struct gbprox_peer); |
| if (!peer) |
| return NULL; |
| |
| peer->bvci = bvci; |
| llist_add(&peer->list, &gbprox_bts_peers); |
| |
| return peer; |
| } |
| |
| static void peer_free(struct gbprox_peer *peer) |
| { |
| llist_del(&peer->list); |
| talloc_free(peer); |
| } |
| |
| /* FIXME: this needs to go to libosmocore/msgb.c */ |
| static struct msgb *msgb_copy(const struct msgb *msg, const char *name) |
| { |
| struct libgb_msgb_cb *old_cb, *new_cb; |
| struct msgb *new_msg; |
| |
| new_msg = msgb_alloc(msg->data_len, name); |
| if (!new_msg) |
| return NULL; |
| |
| /* copy data */ |
| memcpy(new_msg->_data, msg->_data, new_msg->data_len); |
| |
| /* copy header */ |
| new_msg->len = msg->len; |
| new_msg->data += msg->data - msg->_data; |
| new_msg->head += msg->head - msg->_data; |
| new_msg->tail += msg->tail - msg->_data; |
| |
| new_msg->l1h = new_msg->_data + (msg->l1h - msg->_data); |
| new_msg->l2h = new_msg->_data + (msg->l2h - msg->_data); |
| new_msg->l3h = new_msg->_data + (msg->l3h - msg->_data); |
| new_msg->l4h = new_msg->_data + (msg->l4h - msg->_data); |
| |
| /* copy GB specific data */ |
| old_cb = LIBGB_MSGB_CB(msg); |
| new_cb = LIBGB_MSGB_CB(new_msg); |
| |
| new_cb->bssgph = new_msg->_data + (old_cb->bssgph - msg->_data); |
| new_cb->llch = new_msg->_data + (old_cb->llch - msg->_data); |
| |
| /* bssgp_cell_id is a pointer into the old msgb, so we need to make |
| * it a pointer into the new msgb */ |
| new_cb->bssgp_cell_id = new_msg->_data + (old_cb->bssgp_cell_id - msg->_data); |
| new_cb->nsei = old_cb->nsei; |
| new_cb->bvci = old_cb->bvci; |
| new_cb->tlli = old_cb->tlli; |
| |
| return new_msg; |
| } |
| |
| /* strip off the NS header */ |
| static void strip_ns_hdr(struct msgb *msg) |
| { |
| int strip_len = msgb_bssgph(msg) - msg->data; |
| msgb_pull(msg, strip_len); |
| } |
| |
| /* feed a message down the NS-VC associated with the specified peer */ |
| static int gbprox_relay2sgsn(struct msgb *old_msg, uint16_t ns_bvci) |
| { |
| /* create a copy of the message so the old one can |
| * be free()d safely when we return from gbprox_rcvmsg() */ |
| struct msgb *msg = msgb_copy(old_msg, "msgb_relay2sgsn"); |
| |
| DEBUGP(DGPRS, "NSEI=%u proxying BTS->SGSN (NS_BVCI=%u, NSEI=%u)\n", |
| msgb_nsei(msg), ns_bvci, gbcfg.nsip_sgsn_nsei); |
| |
| msgb_bvci(msg) = ns_bvci; |
| msgb_nsei(msg) = gbcfg.nsip_sgsn_nsei; |
| |
| strip_ns_hdr(msg); |
| |
| return gprs_ns_sendmsg(bssgp_nsi, msg); |
| } |
| |
| /* feed a message down the NS-VC associated with the specified peer */ |
| static int gbprox_relay2peer(struct msgb *old_msg, struct gbprox_peer *peer, |
| uint16_t ns_bvci) |
| { |
| /* create a copy of the message so the old one can |
| * be free()d safely when we return from gbprox_rcvmsg() */ |
| struct msgb *msg = msgb_copy(old_msg, "msgb_relay2peer"); |
| |
| DEBUGP(DGPRS, "NSEI=%u proxying SGSN->BSS (NS_BVCI=%u, NSEI=%u)\n", |
| msgb_nsei(msg), ns_bvci, peer->nsvc->nsei); |
| |
| msgb_bvci(msg) = ns_bvci; |
| msgb_nsei(msg) = peer->nsvc->nsei; |
| |
| /* Strip the old NS header, it will be replaced with a new one */ |
| strip_ns_hdr(msg); |
| |
| return gprs_ns_sendmsg(bssgp_nsi, msg); |
| } |
| |
| static int block_unblock_peer(uint16_t ptp_bvci, uint8_t pdu_type) |
| { |
| struct gbprox_peer *peer; |
| |
| peer = peer_by_bvci(ptp_bvci); |
| if (!peer) { |
| LOGP(DGPRS, LOGL_ERROR, "BVCI=%u: Cannot find BSS\n", |
| ptp_bvci); |
| return -ENOENT; |
| } |
| |
| switch (pdu_type) { |
| case BSSGP_PDUT_BVC_BLOCK_ACK: |
| peer->blocked = 1; |
| break; |
| case BSSGP_PDUT_BVC_UNBLOCK_ACK: |
| peer->blocked = 0; |
| break; |
| default: |
| break; |
| } |
| return 0; |
| } |
| |
| /* Send a message to a peer identified by ptp_bvci but using ns_bvci |
| * in the NS hdr */ |
| static int gbprox_relay2bvci(struct msgb *msg, uint16_t ptp_bvci, |
| uint16_t ns_bvci) |
| { |
| struct gbprox_peer *peer; |
| |
| peer = peer_by_bvci(ptp_bvci); |
| if (!peer) { |
| LOGP(DGPRS, LOGL_ERROR, "BVCI=%u: Cannot find BSS\n", |
| ptp_bvci); |
| return -ENOENT; |
| } |
| |
| return gbprox_relay2peer(msg, peer, ns_bvci); |
| } |
| |
| int bssgp_prim_cb(struct osmo_prim_hdr *oph, void *ctx) |
| { |
| return 0; |
| } |
| |
| /* Receive an incoming signalling message from a BSS-side NS-VC */ |
| static int gbprox_rx_sig_from_bss(struct msgb *msg, struct gprs_nsvc *nsvc, |
| uint16_t ns_bvci) |
| { |
| struct bssgp_normal_hdr *bgph = (struct bssgp_normal_hdr *) msgb_bssgph(msg); |
| struct tlv_parsed tp; |
| uint8_t pdu_type = bgph->pdu_type; |
| int data_len = msgb_bssgp_len(msg) - sizeof(*bgph); |
| struct gbprox_peer *from_peer; |
| struct gprs_ra_id raid; |
| |
| if (ns_bvci != 0 && ns_bvci != 1) { |
| LOGP(DGPRS, LOGL_NOTICE, "NSEI=%u BVCI=%u is not signalling\n", |
| nsvc->nsei, ns_bvci); |
| return -EINVAL; |
| } |
| |
| /* we actually should never see those two for BVCI == 0, but double-check |
| * just to make sure */ |
| if (pdu_type == BSSGP_PDUT_UL_UNITDATA || |
| pdu_type == BSSGP_PDUT_DL_UNITDATA) { |
| LOGP(DGPRS, LOGL_NOTICE, "NSEI=%u UNITDATA not allowed in " |
| "signalling\n", nsvc->nsei); |
| return -EINVAL; |
| } |
| |
| bssgp_tlv_parse(&tp, bgph->data, data_len); |
| |
| switch (pdu_type) { |
| case BSSGP_PDUT_SUSPEND: |
| case BSSGP_PDUT_RESUME: |
| /* We implement RAC snooping during SUSPEND/RESUME, since |
| * it establishes a relationsip between BVCI/peer and the |
| * routeing area code. The snooped information is then |
| * used for routing the {SUSPEND,RESUME}_[N]ACK back to |
| * the correct BSSGP */ |
| if (!TLVP_PRESENT(&tp, BSSGP_IE_ROUTEING_AREA)) |
| goto err_mand_ie; |
| from_peer = peer_by_nsvc(nsvc); |
| if (!from_peer) |
| goto err_no_peer; |
| memcpy(from_peer->ra, TLVP_VAL(&tp, BSSGP_IE_ROUTEING_AREA), |
| sizeof(from_peer->ra)); |
| gsm48_parse_ra(&raid, from_peer->ra); |
| LOGP(DGPRS, LOGL_INFO, "NSEI=%u BSSGP SUSPEND/RESUME " |
| "RAC snooping: RAC %u-%u-%u-%u behind BVCI=%u, " |
| "NSVCI=%u\n",nsvc->nsei, raid.mcc, raid.mnc, raid.lac, |
| raid.rac , from_peer->bvci, nsvc->nsvci); |
| /* FIXME: This only supports one BSS per RA */ |
| break; |
| case BSSGP_PDUT_BVC_RESET: |
| /* If we receive a BVC reset on the signalling endpoint, we |
| * don't want the SGSN to reset, as the signalling endpoint |
| * is common for all point-to-point BVCs (and thus all BTS) */ |
| if (TLVP_PRESENT(&tp, BSSGP_IE_BVCI)) { |
| uint16_t bvci = ntohs(tlvp_val16_unal(&tp, BSSGP_IE_BVCI)); |
| LOGP(DGPRS, LOGL_INFO, "NSEI=%u Rx BVC RESET (BVCI=%u)\n", |
| nsvc->nsei, bvci); |
| if (bvci == 0) { |
| /* FIXME: only do this if SGSN is alive! */ |
| LOGP(DGPRS, LOGL_INFO, "NSEI=%u Tx fake " |
| "BVC RESET ACK of BVCI=0\n", nsvc->nsei); |
| return bssgp_tx_simple_bvci(BSSGP_PDUT_BVC_RESET_ACK, |
| nsvc->nsei, 0, ns_bvci); |
| } |
| from_peer = peer_by_bvci(bvci); |
| if (!from_peer) { |
| /* if a PTP-BVC is reset, and we don't know that |
| * PTP-BVCI yet, we should allocate a new peer */ |
| LOGP(DGPRS, LOGL_INFO, "Allocationg new peer for " |
| "BVCI=%u via NSVCI=%u/NSEI=%u\n", bvci, |
| nsvc->nsvci, nsvc->nsei); |
| from_peer = peer_alloc(bvci); |
| from_peer->nsvc = nsvc; |
| } |
| if (TLVP_PRESENT(&tp, BSSGP_IE_CELL_ID)) { |
| struct gprs_ra_id raid; |
| /* We have a Cell Identifier present in this |
| * PDU, this means we can extend our local |
| * state information about this particular cell |
| * */ |
| memcpy(from_peer->ra, |
| TLVP_VAL(&tp, BSSGP_IE_CELL_ID), |
| sizeof(from_peer->ra)); |
| gsm48_parse_ra(&raid, from_peer->ra); |
| LOGP(DGPRS, LOGL_INFO, "NSEI=%u/BVCI=%u " |
| "Cell ID %u-%u-%u-%u\n", nsvc->nsei, |
| bvci, raid.mcc, raid.mnc, raid.lac, |
| raid.rac); |
| } |
| } |
| break; |
| } |
| |
| /* Normally, we can simply pass on all signalling messages from BSS to |
| * SGSN */ |
| return gbprox_relay2sgsn(msg, ns_bvci); |
| err_no_peer: |
| LOGP(DGPRS, LOGL_ERROR, "NSEI=%u(BSS) cannot find peer based on RAC\n", |
| nsvc->nsei); |
| return bssgp_tx_status(BSSGP_CAUSE_UNKNOWN_BVCI, NULL, msg); |
| err_mand_ie: |
| LOGP(DGPRS, LOGL_ERROR, "NSEI=%u(BSS) missing mandatory RA IE\n", |
| nsvc->nsei); |
| return bssgp_tx_status(BSSGP_CAUSE_MISSING_MAND_IE, NULL, msg); |
| } |
| |
| /* Receive paging request from SGSN, we need to relay to proper BSS */ |
| static int gbprox_rx_paging(struct msgb *msg, struct tlv_parsed *tp, |
| struct gprs_nsvc *nsvc, uint16_t ns_bvci) |
| { |
| struct gbprox_peer *peer = NULL; |
| |
| LOGP(DGPRS, LOGL_INFO, "NSEI=%u(SGSN) BSSGP PAGING ", |
| nsvc->nsei); |
| if (TLVP_PRESENT(tp, BSSGP_IE_BVCI)) { |
| uint16_t bvci = ntohs(tlvp_val16_unal(tp, BSSGP_IE_BVCI)); |
| LOGPC(DGPRS, LOGL_INFO, "routing by BVCI to peer BVCI=%u\n", |
| bvci); |
| } else if (TLVP_PRESENT(tp, BSSGP_IE_ROUTEING_AREA)) { |
| peer = peer_by_rac(TLVP_VAL(tp, BSSGP_IE_ROUTEING_AREA)); |
| LOGPC(DGPRS, LOGL_INFO, "routing by RAC to peer BVCI=%u\n", |
| peer ? peer->bvci : -1); |
| } else if (TLVP_PRESENT(tp, BSSGP_IE_LOCATION_AREA)) { |
| peer = peer_by_lac(TLVP_VAL(tp, BSSGP_IE_LOCATION_AREA)); |
| LOGPC(DGPRS, LOGL_INFO, "routing by LAC to peer BVCI=%u\n", |
| peer ? peer->bvci : -1); |
| } else |
| LOGPC(DGPRS, LOGL_INFO, "\n"); |
| |
| if (!peer) { |
| LOGP(DGPRS, LOGL_ERROR, "NSEI=%u(SGSN) BSSGP PAGING: " |
| "unable to route, missing IE\n", nsvc->nsei); |
| return -EINVAL; |
| } |
| return gbprox_relay2peer(msg, peer, ns_bvci); |
| } |
| |
| /* Receive an incoming BVC-RESET message from the SGSN */ |
| static int rx_reset_from_sgsn(struct msgb *msg, struct tlv_parsed *tp, |
| struct gprs_nsvc *nsvc, uint16_t ns_bvci) |
| { |
| struct gbprox_peer *peer; |
| uint16_t ptp_bvci; |
| |
| if (!TLVP_PRESENT(tp, BSSGP_IE_BVCI)) { |
| return bssgp_tx_status(BSSGP_CAUSE_MISSING_MAND_IE, |
| NULL, msg); |
| } |
| ptp_bvci = ntohs(tlvp_val16_unal(tp, BSSGP_IE_BVCI)); |
| |
| if (ptp_bvci >= 2) { |
| /* A reset for a PTP BVC was received, forward it to its |
| * respective peer */ |
| peer = peer_by_bvci(ptp_bvci); |
| if (!peer) { |
| LOGP(DGPRS, LOGL_ERROR, "NSEI=%u BVCI=%u: Cannot find BSS\n", |
| nsvc->nsei, ptp_bvci); |
| return bssgp_tx_status(BSSGP_CAUSE_UNKNOWN_BVCI, |
| NULL, msg); |
| } |
| return gbprox_relay2peer(msg, peer, ns_bvci); |
| } |
| |
| /* A reset for the Signalling entity has been received |
| * from the SGSN. As the signalling BVCI is shared |
| * among all the BSS's that we multiplex, it needs to |
| * be relayed */ |
| llist_for_each_entry(peer, &gbprox_bts_peers, list) |
| gbprox_relay2peer(msg, peer, ns_bvci); |
| |
| return 0; |
| } |
| |
| /* Receive an incoming signalling message from the SGSN-side NS-VC */ |
| static int gbprox_rx_sig_from_sgsn(struct msgb *msg, struct gprs_nsvc *nsvc, |
| uint16_t ns_bvci) |
| { |
| struct bssgp_normal_hdr *bgph = (struct bssgp_normal_hdr *) msgb_bssgph(msg); |
| struct tlv_parsed tp; |
| uint8_t pdu_type = bgph->pdu_type; |
| int data_len = msgb_bssgp_len(msg) - sizeof(*bgph); |
| struct gbprox_peer *peer; |
| uint16_t bvci; |
| int rc = 0; |
| |
| if (ns_bvci != 0 && ns_bvci != 1) { |
| LOGP(DGPRS, LOGL_NOTICE, "NSEI=%u(SGSN) BVCI=%u is not " |
| "signalling\n", nsvc->nsei, ns_bvci); |
| /* FIXME: Send proper error message */ |
| return -EINVAL; |
| } |
| |
| /* we actually should never see those two for BVCI == 0, but double-check |
| * just to make sure */ |
| if (pdu_type == BSSGP_PDUT_UL_UNITDATA || |
| pdu_type == BSSGP_PDUT_DL_UNITDATA) { |
| LOGP(DGPRS, LOGL_NOTICE, "NSEI=%u(SGSN) UNITDATA not allowed in " |
| "signalling\n", nsvc->nsei); |
| return bssgp_tx_status(BSSGP_CAUSE_PROTO_ERR_UNSPEC, NULL, msg); |
| } |
| |
| rc = bssgp_tlv_parse(&tp, bgph->data, data_len); |
| |
| switch (pdu_type) { |
| case BSSGP_PDUT_BVC_RESET: |
| rc = rx_reset_from_sgsn(msg, &tp, nsvc, ns_bvci); |
| break; |
| case BSSGP_PDUT_FLUSH_LL: |
| case BSSGP_PDUT_BVC_RESET_ACK: |
| /* simple case: BVCI IE is mandatory */ |
| if (!TLVP_PRESENT(&tp, BSSGP_IE_BVCI)) |
| goto err_mand_ie; |
| bvci = ntohs(tlvp_val16_unal(&tp, BSSGP_IE_BVCI)); |
| rc = gbprox_relay2bvci(msg, bvci, ns_bvci); |
| break; |
| case BSSGP_PDUT_PAGING_PS: |
| case BSSGP_PDUT_PAGING_CS: |
| /* process the paging request (LAC/RAC lookup) */ |
| rc = gbprox_rx_paging(msg, &tp, nsvc, ns_bvci); |
| break; |
| case BSSGP_PDUT_STATUS: |
| /* Some exception has occurred */ |
| LOGP(DGPRS, LOGL_NOTICE, |
| "NSEI=%u(SGSN) BSSGP STATUS ", nsvc->nsei); |
| if (!TLVP_PRESENT(&tp, BSSGP_IE_CAUSE)) { |
| LOGPC(DGPRS, LOGL_NOTICE, "\n"); |
| goto err_mand_ie; |
| } |
| LOGPC(DGPRS, LOGL_NOTICE, |
| "cause=0x%02x(%s) ", *TLVP_VAL(&tp, BSSGP_IE_CAUSE), |
| bssgp_cause_str(*TLVP_VAL(&tp, BSSGP_IE_CAUSE))); |
| if (TLVP_PRESENT(&tp, BSSGP_IE_BVCI)) { |
| uint16_t bvci = tlvp_val16_unal(&tp, BSSGP_IE_BVCI); |
| LOGPC(DGPRS, LOGL_NOTICE, |
| "BVCI=%u\n", ntohs(bvci)); |
| } else |
| LOGPC(DGPRS, LOGL_NOTICE, "\n"); |
| break; |
| /* those only exist in the SGSN -> BSS direction */ |
| case BSSGP_PDUT_SUSPEND_ACK: |
| case BSSGP_PDUT_SUSPEND_NACK: |
| case BSSGP_PDUT_RESUME_ACK: |
| case BSSGP_PDUT_RESUME_NACK: |
| /* RAC IE is mandatory */ |
| if (!TLVP_PRESENT(&tp, BSSGP_IE_ROUTEING_AREA)) |
| goto err_mand_ie; |
| peer = peer_by_rac(TLVP_VAL(&tp, BSSGP_IE_ROUTEING_AREA)); |
| if (!peer) |
| goto err_no_peer; |
| rc = gbprox_relay2peer(msg, peer, ns_bvci); |
| break; |
| case BSSGP_PDUT_BVC_BLOCK_ACK: |
| case BSSGP_PDUT_BVC_UNBLOCK_ACK: |
| if (!TLVP_PRESENT(&tp, BSSGP_IE_BVCI)) |
| goto err_mand_ie; |
| bvci = ntohs(tlvp_val16_unal(&tp, BSSGP_IE_BVCI)); |
| if (bvci == 0) { |
| LOGP(DGPRS, LOGL_NOTICE, "NSEI=%u(SGSN) BSSGP " |
| "%sBLOCK_ACK for signalling BVCI ?!?\n", nsvc->nsei, |
| pdu_type == BSSGP_PDUT_BVC_UNBLOCK_ACK ? "UN":""); |
| /* should we send STATUS ? */ |
| } else { |
| /* Mark BVC as (un)blocked */ |
| block_unblock_peer(bvci, pdu_type); |
| } |
| rc = gbprox_relay2bvci(msg, bvci, ns_bvci); |
| break; |
| case BSSGP_PDUT_SGSN_INVOKE_TRACE: |
| LOGP(DGPRS, LOGL_ERROR, |
| "NSEI=%u(SGSN) BSSGP INVOKE TRACE not supported\n",nsvc->nsei); |
| rc = bssgp_tx_status(BSSGP_CAUSE_PDU_INCOMP_FEAT, NULL, msg); |
| break; |
| default: |
| LOGP(DGPRS, LOGL_NOTICE, "BSSGP PDU type 0x%02x unknown\n", |
| pdu_type); |
| rc = bssgp_tx_status(BSSGP_CAUSE_PROTO_ERR_UNSPEC, NULL, msg); |
| break; |
| } |
| |
| return rc; |
| err_mand_ie: |
| LOGP(DGPRS, LOGL_ERROR, "NSEI=%u(SGSN) missing mandatory IE\n", |
| nsvc->nsei); |
| return bssgp_tx_status(BSSGP_CAUSE_MISSING_MAND_IE, NULL, msg); |
| err_no_peer: |
| LOGP(DGPRS, LOGL_ERROR, "NSEI=%u(SGSN) cannot find peer based on RAC\n", |
| nsvc->nsei); |
| return bssgp_tx_status(BSSGP_CAUSE_UNKNOWN_BVCI, NULL, msg); |
| } |
| |
| /* Main input function for Gb proxy */ |
| int gbprox_rcvmsg(struct msgb *msg, struct gprs_nsvc *nsvc, uint16_t ns_bvci) |
| { |
| int rc; |
| struct gbprox_peer *peer; |
| |
| /* Only BVCI=0 messages need special treatment */ |
| if (ns_bvci == 0 || ns_bvci == 1) { |
| if (nsvc->remote_end_is_sgsn) |
| rc = gbprox_rx_sig_from_sgsn(msg, nsvc, ns_bvci); |
| else |
| rc = gbprox_rx_sig_from_bss(msg, nsvc, ns_bvci); |
| } else { |
| /* All other BVCI are PTP and thus can be simply forwarded */ |
| if (!nsvc->remote_end_is_sgsn) { |
| return gbprox_relay2sgsn(msg, ns_bvci); |
| } |
| /* else: SGSN -> BSS direction */ |
| peer = peer_by_bvci(ns_bvci); |
| if (!peer) { |
| LOGP(DGPRS, LOGL_INFO, "Allocationg new peer for " |
| "BVCI=%u via NSVC=%u/NSEI=%u\n", ns_bvci, |
| nsvc->nsvci, nsvc->nsei); |
| peer = peer_alloc(ns_bvci); |
| peer->nsvc = nsvc; |
| } |
| if (peer->blocked) { |
| LOGP(DGPRS, LOGL_NOTICE, "Dropping PDU for " |
| "blocked BVCI=%u via NSVC=%u/NSEI=%u\n", |
| ns_bvci, nsvc->nsvci, nsvc->nsei); |
| return bssgp_tx_status(BSSGP_CAUSE_BVCI_BLOCKED, NULL, msg); |
| } |
| rc = gbprox_relay2peer(msg, peer, ns_bvci); |
| } |
| |
| return rc; |
| } |
| |
| int gbprox_reset_persistent_nsvcs(struct gprs_ns_inst *nsi) |
| { |
| struct gprs_nsvc *nsvc; |
| |
| llist_for_each_entry(nsvc, &nsi->gprs_nsvcs, list) { |
| if (!nsvc->persistent) |
| continue; |
| gprs_nsvc_reset(nsvc, NS_CAUSE_OM_INTERVENTION); |
| } |
| return 0; |
| } |
| |
| /* Signal handler for signals from NS layer */ |
| int gbprox_signal(unsigned int subsys, unsigned int signal, |
| void *handler_data, void *signal_data) |
| { |
| struct ns_signal_data *nssd = signal_data; |
| struct gprs_nsvc *nsvc = nssd->nsvc; |
| struct gbprox_peer *peer; |
| |
| if (subsys != SS_L_NS) |
| return 0; |
| |
| if (signal == S_NS_RESET && nsvc->nsei == gbcfg.nsip_sgsn_nsei) { |
| /* We have received a NS-RESET from the NSEI and NSVC |
| * of the SGSN. This might happen with SGSN that start |
| * their own NS-RESET procedure without waiting for our |
| * NS-RESET */ |
| nsvc->remote_end_is_sgsn = 1; |
| } |
| |
| if (signal == S_NS_ALIVE_EXP && nsvc->remote_end_is_sgsn) { |
| LOGP(DGPRS, LOGL_NOTICE, "Tns alive expired too often, " |
| "re-starting RESET procedure\n"); |
| gprs_ns_nsip_connect(nsvc->nsi, &nsvc->ip.bts_addr, |
| nsvc->nsei, nsvc->nsvci); |
| } |
| |
| if (!nsvc->remote_end_is_sgsn) { |
| /* from BSS to SGSN */ |
| peer = peer_by_nsvc(nsvc); |
| if (!peer) { |
| LOGP(DGPRS, LOGL_NOTICE, "signal %u for unknown peer " |
| "NSEI=%u/NSVCI=%u\n", signal, nsvc->nsei, |
| nsvc->nsvci); |
| return 0; |
| } |
| switch (signal) { |
| case S_NS_RESET: |
| case S_NS_BLOCK: |
| if (!peer->blocked) |
| break; |
| LOGP(DGPRS, LOGL_NOTICE, "Converting NS_RESET from " |
| "NSEI=%u/NSVCI=%u into BSSGP_BVC_BLOCK to SGSN\n", |
| nsvc->nsei, nsvc->nsvci); |
| bssgp_tx_simple_bvci(BSSGP_PDUT_BVC_BLOCK, nsvc->nsei, |
| peer->bvci, 0); |
| break; |
| } |
| } else { |
| /* iterate over all BTS peers and send the respective PDU */ |
| llist_for_each_entry(peer, &gbprox_bts_peers, list) { |
| switch (signal) { |
| case S_NS_RESET: |
| gprs_ns_tx_reset(peer->nsvc, nssd->cause); |
| break; |
| case S_NS_BLOCK: |
| gprs_ns_tx_block(peer->nsvc, nssd->cause); |
| break; |
| case S_NS_UNBLOCK: |
| gprs_ns_tx_unblock(peer->nsvc); |
| break; |
| } |
| } |
| } |
| return 0; |
| } |
| |
| |
| #include <osmocom/vty/command.h> |
| |
| gDEFUN(show_gbproxy, show_gbproxy_cmd, "show gbproxy", |
| SHOW_STR "Display information about the Gb proxy") |
| { |
| struct gbprox_peer *peer; |
| |
| llist_for_each_entry(peer, &gbprox_bts_peers, list) { |
| struct gprs_nsvc *nsvc = peer->nsvc; |
| struct gprs_ra_id raid; |
| gsm48_parse_ra(&raid, peer->ra); |
| |
| vty_out(vty, "NSEI %5u, NS-VC %5u, PTP-BVCI %5u, " |
| "RAC %u-%u-%u-%u", |
| nsvc->nsei, nsvc->nsvci, peer->bvci, |
| raid.mcc, raid.mnc, raid.lac, raid.rac); |
| if (nsvc->ll == GPRS_NS_LL_UDP || nsvc->ll == GPRS_NS_LL_FR_GRE) |
| vty_out(vty, " %s:%u", |
| inet_ntoa(nsvc->ip.bts_addr.sin_addr), |
| ntohs(nsvc->ip.bts_addr.sin_port)); |
| if (peer->blocked) |
| vty_out(vty, " [BVC-BLOCKED]"); |
| |
| vty_out(vty, "%s", VTY_NEWLINE); |
| } |
| return CMD_SUCCESS; |
| } |