diff options
Diffstat (limited to 'openbsc/src/gprs/gprs_ns.c')
-rw-r--r-- | openbsc/src/gprs/gprs_ns.c | 644 |
1 files changed, 644 insertions, 0 deletions
diff --git a/openbsc/src/gprs/gprs_ns.c b/openbsc/src/gprs/gprs_ns.c new file mode 100644 index 00000000..3d9bb896 --- /dev/null +++ b/openbsc/src/gprs/gprs_ns.c @@ -0,0 +1,644 @@ +/* GPRS Networks Service (NS) messages on the Gb interfacebvci = msgb_bvci(msg); + * 3GPP TS 08.16 version 8.0.1 Release 1999 / ETSI TS 101 299 V8.0.1 (2002-05) */ + +/* (C) 2009-2010 by Harald Welte <laforge@gnumonks.org> + * + * All Rights Reserved + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + * + */ + +/* Some introduction into NS: NS is used typically on top of frame relay, + * but in the ip.access world it is encapsulated in UDP packets. It serves + * as an intermediate shim betwen BSSGP and the underlying medium. It doesn't + * do much, apart from providing congestion notification and status indication. + * + * Terms: + * NS Network Service + * NSVC NS Virtual Connection + * NSEI NS Entity Identifier + * NSVL NS Virtual Link + * NSVLI NS Virtual Link Identifier + * BVC BSSGP Virtual Connection + * BVCI BSSGP Virtual Connection Identifier + * NSVCG NS Virtual Connection Goup + * Blocked NS-VC cannot be used for user traffic + * Alive Ability of a NS-VC to provide communication + * + * There can be multiple BSSGP virtual connections over one (group of) NSVC's. BSSGP will + * therefore identify the BSSGP virtual connection by a BVCI passed down to NS. + * NS then has to firgure out which NSVC's are responsible for this BVCI. + * Those mappings are administratively configured. + */ + +#include <stdlib.h> +#include <unistd.h> +#include <errno.h> +#include <stdint.h> + +#include <arpa/inet.h> + +#include <openbsc/gsm_data.h> +#include <osmocore/msgb.h> +#include <osmocore/tlv.h> +#include <osmocore/talloc.h> +#include <osmocore/select.h> +#include <openbsc/debug.h> +#include <openbsc/gprs_ns.h> +#include <openbsc/gprs_bssgp.h> + +#define NS_ALLOC_SIZE 1024 + +static const struct tlv_definition ns_att_tlvdef = { + .def = { + [NS_IE_CAUSE] = { TLV_TYPE_TvLV, 0 }, + [NS_IE_VCI] = { TLV_TYPE_TvLV, 0 }, + [NS_IE_PDU] = { TLV_TYPE_TvLV, 0 }, + [NS_IE_BVCI] = { TLV_TYPE_TvLV, 0 }, + [NS_IE_NSEI] = { TLV_TYPE_TvLV, 0 }, + }, +}; + +/* Lookup struct gprs_nsvc based on NSVCI */ +static struct gprs_nsvc *nsvc_by_nsvci(struct gprs_ns_inst *nsi, + uint16_t nsvci) +{ + struct gprs_nsvc *nsvc; + llist_for_each_entry(nsvc, &nsi->gprs_nsvcs, list) { + if (nsvc->nsvci == nsvci) + return nsvc; + } + return NULL; +} + +/* Lookup struct gprs_nsvc based on NSVCI */ +static struct gprs_nsvc *nsvc_by_nsei(struct gprs_ns_inst *nsi, + uint16_t nsei) +{ + struct gprs_nsvc *nsvc; + llist_for_each_entry(nsvc, &nsi->gprs_nsvcs, list) { + if (nsvc->nsei == nsei) + return nsvc; + } + return NULL; +} + + +/* Lookup struct gprs_nsvc based on remote peer socket addr */ +static struct gprs_nsvc *nsvc_by_rem_addr(struct gprs_ns_inst *nsi, + struct sockaddr_in *sin) +{ + struct gprs_nsvc *nsvc; + llist_for_each_entry(nsvc, &nsi->gprs_nsvcs, list) { + if (!memcmp(&nsvc->ip.bts_addr, sin, sizeof(*sin))) + return nsvc; + } + return NULL; +} + +static void gprs_ns_timer_cb(void *data); + +static struct gprs_nsvc *nsvc_create(struct gprs_ns_inst *nsi, uint16_t nsvci) +{ + struct gprs_nsvc *nsvc; + + nsvc = talloc_zero(nsi, struct gprs_nsvc); + nsvc->nsvci = nsvci; + /* before RESET procedure: BLOCKED and DEAD */ + nsvc->state = NSE_S_BLOCKED; + nsvc->nsi = nsi; + nsvc->timer.cb = gprs_ns_timer_cb; + nsvc->timer.data = nsvc; + + llist_add(&nsvc->list, &nsi->gprs_nsvcs); + + return nsvc; +} + +/* Section 10.3.2, Table 13 */ +static const struct value_string ns_cause_str[] = { + { NS_CAUSE_TRANSIT_FAIL, "Transit network failure" }, + { NS_CAUSE_OM_INTERVENTION, "O&M intervention" }, + { NS_CAUSE_EQUIP_FAIL, "Equipment failure" }, + { NS_CAUSE_NSVC_BLOCKED, "NS-VC blocked" }, + { NS_CAUSE_NSVC_UNKNOWN, "NS-VC unknown" }, + { NS_CAUSE_BVCI_UNKNOWN, "BVCI unknown" }, + { NS_CAUSE_SEM_INCORR_PDU, "Semantically incorrect PDU" }, + { NS_CAUSE_PDU_INCOMP_PSTATE, "PDU not compatible with protocol state" }, + { NS_CAUSE_PROTO_ERR_UNSPEC, "Protocol error, unspecified" }, + { NS_CAUSE_INVAL_ESSENT_IE, "Invalid essential IE" }, + { NS_CAUSE_MISSING_ESSENT_IE, "Missing essential IE" }, + { 0, NULL } +}; + +const char *gprs_ns_cause_str(enum ns_cause cause) +{ + return get_value_string(ns_cause_str, cause); +} + +static int nsip_sendmsg(struct gprs_nsvc *nsvc, struct msgb *msg); + +static int gprs_ns_tx(struct gprs_nsvc *nsvc, struct msgb *msg) +{ + int ret; + + switch (nsvc->nsi->ll) { + case GPRS_NS_LL_UDP: + ret = nsip_sendmsg(nsvc, msg); + break; + default: + LOGP(DGPRS, LOGL_ERROR, "unsupported NS linklayer %u\n", nsvc->nsi->ll); + msgb_free(msg); + ret = -EIO; + break; + } + return ret; +} + +static int gprs_ns_tx_simple(struct gprs_nsvc *nsvc, uint8_t pdu_type) +{ + struct msgb *msg = msgb_alloc(NS_ALLOC_SIZE, "GPRS/NS"); + struct gprs_ns_hdr *nsh; + + if (!msg) + return -ENOMEM; + + nsh = (struct gprs_ns_hdr *) msgb_put(msg, sizeof(*nsh)); + + nsh->pdu_type = pdu_type; + + return gprs_ns_tx(nsvc, msg); +} + +static int gprs_ns_tx_reset(struct gprs_nsvc *nsvc, uint8_t cause) +{ + struct msgb *msg = msgb_alloc(NS_ALLOC_SIZE, "GPRS/NS"); + struct gprs_ns_hdr *nsh; + uint16_t nsvci = htons(nsvc->nsvci); + uint16_t nsei = htons(nsvc->nsei); + + if (!msg) + return -ENOMEM; + + nsh = (struct gprs_ns_hdr *) msgb_put(msg, sizeof(*nsh)); + nsh->pdu_type = NS_PDUT_RESET; + + msgb_tvlv_put(msg, NS_IE_CAUSE, 1, &cause); + msgb_tvlv_put(msg, NS_IE_VCI, 2, (uint8_t *) &nsvci); + msgb_tvlv_put(msg, NS_IE_NSEI, 2, (uint8_t *) &nsei); + + return gprs_ns_tx(nsvc, msg); + +} + +#define NS_ALIVE_RETRIES 10 /* after 3 failed retransmit we declare BTS as dead */ + +static const uint8_t timer_mode_tout[_NSVC_TIMER_NR] = { + [NSVC_TIMER_TNS_RESET] = 60, + [NSVC_TIMER_TNS_ALIVE] = 3, + [NSVC_TIMER_TNS_TEST] = 30, +}; + +static void nsvc_start_timer(struct gprs_nsvc *nsvc, enum nsvc_timer_mode mode) +{ + nsvc->alive_retries = 0; + + if (bsc_timer_pending(&nsvc->timer)) + bsc_del_timer(&nsvc->timer); + + nsvc->timer_mode = mode; + bsc_schedule_timer(&nsvc->timer, timer_mode_tout[mode], 0); +} + +static void gprs_ns_timer_cb(void *data) +{ + struct gprs_nsvc *nsvc = data; + + switch (nsvc->timer_mode) { + case NSVC_TIMER_TNS_ALIVE: + /* Tns-alive case: we expired without response ! */ + nsvc->alive_retries++; + if (nsvc->alive_retries > NS_ALIVE_RETRIES) { + /* mark as dead and blocked */ + nsvc->state = NSE_S_BLOCKED; + DEBUGP(DGPRS, "NSEI=%u Tns-alive expired more then " + "%u times, blocking NS-VC\n", nsvc->nsei, + NS_ALIVE_RETRIES); + /* FIXME: inform higher layers */ + return; + } + nsvc_start_timer(nsvc, NSVC_TIMER_TNS_ALIVE); + break; + case NSVC_TIMER_TNS_TEST: + /* Tns-test case: send NS-ALIVE PDU */ + gprs_ns_tx_simple(nsvc, NS_PDUT_ALIVE); + /* start Tns-alive timer */ + nsvc_start_timer(nsvc, NSVC_TIMER_TNS_ALIVE); + break; + case NSVC_TIMER_TNS_RESET: + /* Chapter 7.3: Re-send the RESET */ + gprs_ns_tx_reset(nsvc, NS_CAUSE_OM_INTERVENTION); + nsvc_start_timer(nsvc, NSVC_TIMER_TNS_RESET); + break; + } +} + +/* Section 9.2.6 */ +static int gprs_ns_tx_reset_ack(struct gprs_nsvc *nsvc) +{ + struct msgb *msg = msgb_alloc(NS_ALLOC_SIZE, "GPRS/NS"); + struct gprs_ns_hdr *nsh; + uint16_t nsvci, nsei; + + if (!msg) + return -ENOMEM; + + nsvci = htons(nsvc->nsvci); + nsei = htons(nsvc->nsei); + + nsh = (struct gprs_ns_hdr *) msgb_put(msg, sizeof(*nsh)); + + nsh->pdu_type = NS_PDUT_RESET_ACK; + + DEBUGP(DGPRS, "NSEI=%u Tx NS RESET ACK (NSVCI=%u)\n", + nsvc->nsei, nsvc->nsvci); + + msgb_tvlv_put(msg, NS_IE_VCI, 2, (uint8_t *)&nsvci); + msgb_tvlv_put(msg, NS_IE_NSEI, 2, (uint8_t *)&nsei); + + return gprs_ns_tx(nsvc, msg); +} + +/* Section 9.2.10: transmit side / NS-UNITDATA-REQUEST primitive */ +int gprs_ns_sendmsg(struct gprs_ns_inst *nsi, struct msgb *msg) +{ + struct gprs_nsvc *nsvc; + struct gprs_ns_hdr *nsh; + uint16_t bvci = msgb_bvci(msg); + + nsvc = nsvc_by_nsei(nsi, msgb_nsei(msg)); + if (!nsvc) { + LOGP(DGPRS, LOGL_ERROR, "Unable to resolve NSEI %u " + "to NS-VC!\n", msgb_nsei(msg)); + return -EINVAL; + } + + if (!(nsvc->state & NSE_S_ALIVE)) { + LOGP(DGPRS, LOGL_ERROR, "NSEI=%u is not alive, cannot send\n", + nsvc->nsei); + return -EBUSY; + } + if (nsvc->state & NSE_S_BLOCKED) { + LOGP(DGPRS, LOGL_ERROR, "NSEI=%u is blocked, cannot send\n", + nsvc->nsei); + return -EBUSY; + } + + nsh = (struct gprs_ns_hdr *) msgb_push(msg, sizeof(*nsh) + 3); + if (!nsh) { + LOGP(DGPRS, LOGL_ERROR, "Not enough headroom for NS header\n"); + return -EIO; + } + + nsh->pdu_type = NS_PDUT_UNITDATA; + /* spare octet in data[0] */ + nsh->data[1] = bvci >> 8; + nsh->data[2] = bvci & 0xff; + + return gprs_ns_tx(nsvc, msg); +} + +/* Section 9.2.10: receive side */ +static int gprs_ns_rx_unitdata(struct gprs_nsvc *nsvc, struct msgb *msg) +{ + struct gprs_ns_hdr *nsh = (struct gprs_ns_hdr *)msg->l2h; + uint16_t bvci; + + /* spare octet in data[0] */ + bvci = nsh->data[1] << 8 | nsh->data[2]; + msgb_bssgph(msg) = &nsh->data[3]; + msgb_bvci(msg) = bvci; + + /* call upper layer (BSSGP) */ + return nsvc->nsi->cb(GPRS_NS_EVT_UNIT_DATA, nsvc, msg, bvci); +} + +/* Section 9.2.7 */ +static int gprs_ns_rx_status(struct gprs_nsvc *nsvc, struct msgb *msg) +{ + struct gprs_ns_hdr *nsh = (struct gprs_ns_hdr *) msg->l2h; + struct tlv_parsed tp; + uint8_t cause; + int rc; + + DEBUGP(DGPRS, "NSEI=%u NS STATUS ", nsvc->nsei); + + rc = tlv_parse(&tp, &ns_att_tlvdef, nsh->data, msgb_l2len(msg), 0, 0); + + if (!TLVP_PRESENT(&tp, NS_IE_CAUSE)) { + DEBUGPC(DGPRS, "missing cause IE\n"); + return -EINVAL; + } + + cause = *TLVP_VAL(&tp, NS_IE_CAUSE); + DEBUGPC(DGPRS, "cause=%s\n", gprs_ns_cause_str(cause)); + + return 0; +} + +/* Section 7.3 */ +static int gprs_ns_rx_reset(struct gprs_nsvc *nsvc, struct msgb *msg) +{ + struct gprs_ns_hdr *nsh = (struct gprs_ns_hdr *) msg->l2h; + struct tlv_parsed tp; + uint8_t *cause; + uint16_t *nsvci, *nsei; + int rc; + + rc = tlv_parse(&tp, &ns_att_tlvdef, nsh->data, msgb_l2len(msg), 0, 0); + + if (!TLVP_PRESENT(&tp, NS_IE_CAUSE) || + !TLVP_PRESENT(&tp, NS_IE_VCI) || + !TLVP_PRESENT(&tp, NS_IE_NSEI)) { + /* FIXME: respond with NS_CAUSE_MISSING_ESSENT_IE */ + LOGP(DGPRS, LOGL_ERROR, "NS RESET Missing mandatory IE\n"); + return -EINVAL; + } + + cause = (uint8_t *) TLVP_VAL(&tp, NS_IE_CAUSE); + nsvci = (uint16_t *) TLVP_VAL(&tp, NS_IE_VCI); + nsei = (uint16_t *) TLVP_VAL(&tp, NS_IE_NSEI); + + DEBUGP(DGPRS, "NSEI=%u NS RESET (NSVCI=%u, cause=%s)\n", + nsvc->nsvci, nsvc->nsei, gprs_ns_cause_str(*cause)); + + nsvc->state = NSE_S_BLOCKED | NSE_S_ALIVE; + nsvc->nsei = ntohs(*nsei); + nsvc->nsvci = ntohs(*nsvci); + + /* mark the NS-VC as blocked and alive */ + /* start the test procedure */ + nsvc_start_timer(nsvc, NSVC_TIMER_TNS_ALIVE); + + return gprs_ns_tx_reset_ack(nsvc); +} + +/* main entry point, here incoming NS frames enter */ +int gprs_ns_rcvmsg(struct gprs_ns_inst *nsi, struct msgb *msg, + struct sockaddr_in *saddr) +{ + struct gprs_ns_hdr *nsh = (struct gprs_ns_hdr *) msg->l2h; + struct gprs_nsvc *nsvc; + int rc = 0; + + /* look up the NSVC based on source address */ + nsvc = nsvc_by_rem_addr(nsi, saddr); + if (!nsvc) { + /* Only the RESET procedure creates a new NSVC */ + if (nsh->pdu_type != NS_PDUT_RESET) { + LOGP(DGPRS, LOGL_INFO, "Ignoring NS PDU type 0x%0x " + "from %s for non-existing NS-VC\n", + nsh->pdu_type, inet_ntoa(saddr->sin_addr)); + //gprs_ns_tx_reset(nsvc, NS_CAUSE_NSVC_UNKNOWN); + return -EIO; + } + LOGP(DGPRS, LOGL_INFO, "Creating NS-VC for BSS at %s:%u\n", + inet_ntoa(saddr->sin_addr), ntohs(saddr->sin_port)); + nsvc = nsvc_create(nsi, 0xffff); + nsvc->ip.bts_addr = *saddr; + } else + msgb_nsei(msg) = nsvc->nsei; + + switch (nsh->pdu_type) { + case NS_PDUT_ALIVE: + /* remote end inquires whether we're still alive, + * we need to respond with ALIVE_ACK */ + rc = gprs_ns_tx_simple(nsvc, NS_PDUT_ALIVE_ACK); + break; + case NS_PDUT_ALIVE_ACK: + /* stop Tns-alive */ + bsc_del_timer(&nsvc->timer); + /* start Tns-test */ + nsvc_start_timer(nsvc, NSVC_TIMER_TNS_TEST); + if (nsvc->remote_end_is_sgsn) { + /* FIXME: this should be one level higher */ + if (nsvc->state & NSE_S_BLOCKED) + rc = gprs_ns_tx_simple(nsvc, NS_PDUT_UNBLOCK); + } + break; + case NS_PDUT_UNITDATA: + /* actual user data */ + rc = gprs_ns_rx_unitdata(nsvc, msg); + break; + case NS_PDUT_STATUS: + rc = gprs_ns_rx_status(nsvc, msg); + break; + case NS_PDUT_RESET: + rc = gprs_ns_rx_reset(nsvc, msg); + break; + case NS_PDUT_RESET_ACK: + DEBUGP(DGPRS, "NSEI=%u Rx NS RESET ACK\n", nsvc->nsei); + /* mark remote NS-VC as blocked + active */ + nsvc->remote_state = NSE_S_BLOCKED | NSE_S_ALIVE; + if (nsvc->remote_end_is_sgsn) { + /* stop RESET timer */ + bsc_del_timer(&nsvc->timer); + /* send ALIVE PDU */ + rc = gprs_ns_tx_simple(nsvc, NS_PDUT_ALIVE); + nsvc_start_timer(nsvc, NSVC_TIMER_TNS_ALIVE); + /* mark local state as BLOCKED + ALIVE */ + nsvc->state = NSE_S_BLOCKED | NSE_S_ALIVE; + } + break; + case NS_PDUT_UNBLOCK: + /* Section 7.2: unblocking procedure */ + DEBUGP(DGPRS, "NSEI=%u Rx NS UNBLOCK\n", nsvc->nsei); + nsvc->state &= ~NSE_S_BLOCKED; + rc = gprs_ns_tx_simple(nsvc, NS_PDUT_UNBLOCK_ACK); + break; + case NS_PDUT_UNBLOCK_ACK: + DEBUGP(DGPRS, "NSEI=%u Rx NS UNBLOCK ACK\n", nsvc->nsei); + /* mark remote NS-VC as unblocked + active */ + nsvc->remote_state = NSE_S_ALIVE; + if (nsvc->remote_end_is_sgsn) + nsvc->state = NSE_S_ALIVE; + break; + case NS_PDUT_BLOCK: + DEBUGP(DGPRS, "NSEI=%u Rx NS BLOCK\n", nsvc->nsei); + nsvc->state |= NSE_S_BLOCKED; + rc = gprs_ns_tx_simple(nsvc, NS_PDUT_UNBLOCK_ACK); + break; + case NS_PDUT_BLOCK_ACK: + DEBUGP(DGPRS, "NSEI=%u Rx NS BLOCK ACK\n", nsvc->nsei); + /* mark remote NS-VC as blocked + active */ + nsvc->remote_state = NSE_S_BLOCKED | NSE_S_ALIVE; + break; + default: + DEBUGP(DGPRS, "NSEI=%u Rx Unknown NS PDU type 0x%02x\n", + nsvc->nsei, nsh->pdu_type); + rc = -EINVAL; + break; + } + return rc; +} + +struct gprs_ns_inst *gprs_ns_instantiate(gprs_ns_cb_t *cb) +{ + struct gprs_ns_inst *nsi = talloc_zero(tall_bsc_ctx, struct gprs_ns_inst); + + nsi->cb = cb; + INIT_LLIST_HEAD(&nsi->gprs_nsvcs); + + return nsi; +} + +void gprs_ns_destroy(struct gprs_ns_inst *nsi) +{ + /* FIXME: clear all timers */ + + /* recursively free the NSI and all its NSVCs */ + talloc_free(nsi); +} + + +/* NS-over-IP code, according to 3GPP TS 48.016 Chapter 6.2 + * We don't support Size Procedure, Configuration Procedure, ChangeWeight Procedure */ + +/* Read a single NS-over-IP message */ +static struct msgb *read_nsip_msg(struct bsc_fd *bfd, int *error, + struct sockaddr_in *saddr) +{ + struct msgb *msg = msgb_alloc(NS_ALLOC_SIZE, "Abis/IP/GPRS-NS"); + int ret = 0; + socklen_t saddr_len = sizeof(*saddr); + + if (!msg) { + *error = -ENOMEM; + return NULL; + } + + ret = recvfrom(bfd->fd, msg->data, NS_ALLOC_SIZE, 0, + (struct sockaddr *)saddr, &saddr_len); + if (ret < 0) { + LOGP(DGPRS, LOGL_ERROR, "recv error %s during NSIP recv\n", + strerror(errno)); + msgb_free(msg); + *error = ret; + return NULL; + } else if (ret == 0) { + msgb_free(msg); + *error = ret; + return NULL; + } + + msg->l2h = msg->data; + msgb_put(msg, ret); + + return msg; +} + +static int handle_nsip_read(struct bsc_fd *bfd) +{ + int error; + struct sockaddr_in saddr; + struct gprs_ns_inst *nsi = bfd->data; + struct msgb *msg = read_nsip_msg(bfd, &error, &saddr); + + if (!msg) + return error; + + return gprs_ns_rcvmsg(nsi, msg, &saddr); +} + +static int handle_nsip_write(struct bsc_fd *bfd) +{ + /* FIXME: actually send the data here instead of nsip_sendmsg() */ + return -EIO; +} + +int nsip_sendmsg(struct gprs_nsvc *nsvc, struct msgb *msg) +{ + int rc; + struct gprs_ns_inst *nsi = nsvc->nsi; + struct sockaddr_in *daddr = &nsvc->ip.bts_addr; + + rc = sendto(nsi->nsip.fd.fd, msg->data, msg->len, 0, + (struct sockaddr *)daddr, sizeof(*daddr)); + + talloc_free(msg); + + return rc; +} + +/* UDP Port 23000 carries the LLC-in-BSSGP-in-NS protocol stack */ +static int nsip_fd_cb(struct bsc_fd *bfd, unsigned int what) +{ + int rc = 0; + + if (what & BSC_FD_READ) + rc = handle_nsip_read(bfd); + if (what & BSC_FD_WRITE) + rc = handle_nsip_write(bfd); + + return rc; +} + + +/* FIXME: this is currently in input/ipaccess.c */ +extern int make_sock(struct bsc_fd *bfd, int proto, uint16_t port, + int (*cb)(struct bsc_fd *fd, unsigned int what)); + +/* Listen for incoming GPRS packets */ +int nsip_listen(struct gprs_ns_inst *nsi, uint16_t udp_port) +{ + int ret; + + ret = make_sock(&nsi->nsip.fd, IPPROTO_UDP, udp_port, nsip_fd_cb); + if (ret < 0) + return ret; + + nsi->ll = GPRS_NS_LL_UDP; + nsi->nsip.fd.data = nsi; + + return ret; +} + +/* Establish a connection (from the BSS) to the SGSN */ +struct gprs_nsvc *nsip_connect(struct gprs_ns_inst *nsi, + struct sockaddr_in *dest, uint16_t nsei, + uint16_t nsvci) +{ + struct gprs_nsvc *nsvc; + + nsvc = nsvc_by_rem_addr(nsi, dest); + if (!nsvc) { + nsvc = nsvc_create(nsi, nsvci); + nsvc->ip.bts_addr = *dest; + } + nsvc->nsei = nsei; + nsvc->nsvci = nsvci; + nsvc->remote_end_is_sgsn = 1; + + /* Initiate a RESET procedure */ + if (gprs_ns_tx_reset(nsvc, NS_CAUSE_OM_INTERVENTION) < 0) { + LOGP(DGPRS, LOGL_ERROR, "NSEI=%u, error resetting NS-VC\n", + nsei); + } + /* run a timer and re-transmit the reset request? */ + nsvc_start_timer(nsvc, NSVC_TIMER_TNS_RESET); + + return nsvc; +} |