diff options
author | Jonathan Santos <jrsantos@jonathanrsantos.com> | 2011-05-25 13:54:02 -0400 |
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committer | Jonathan Santos <jrsantos@jonathanrsantos.com> | 2011-05-25 13:54:02 -0400 |
commit | 03fd8d014f9871896a86534432c8757d65a576fe (patch) | |
tree | bad087cacfb6b106f6ca542bf92ef2e2ecea5dd3 /src/gprs/gb_proxy.c | |
parent | e7dae79f5839029279c9fd4543804882c019bf42 (diff) |
Import upstream version 0.9.13upstream/0.9.13
Diffstat (limited to 'src/gprs/gb_proxy.c')
-rw-r--r-- | src/gprs/gb_proxy.c | 684 |
1 files changed, 684 insertions, 0 deletions
diff --git a/src/gprs/gb_proxy.c b/src/gprs/gb_proxy.c new file mode 100644 index 000000000..8df93a9ce --- /dev/null +++ b/src/gprs/gb_proxy.c @@ -0,0 +1,684 @@ +/* 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 <sys/types.h> +#include <arpa/inet.h> + +#include <osmocore/talloc.h> +#include <osmocore/select.h> + +#include <openbsc/signal.h> +#include <openbsc/debug.h> +#include <openbsc/gprs_ns.h> +#include <openbsc/gprs_bssgp.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 openbsc_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 = OBSC_MSGB_CB(msg); + new_cb = OBSC_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); +} + +/* 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(*(uint16_t *)TLVP_VAL(&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(*(uint16_t *)TLVP_VAL(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(*(uint16_t *)TLVP_VAL(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(*(uint16_t *)TLVP_VAL(&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 = (uint16_t *) + TLVP_VAL(&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(*(uint16_t *)TLVP_VAL(&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_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"); + 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; +} |