2010-04-30 17:54:29 +00:00
|
|
|
/* GPRS Networks Service (NS) messages on the Gb interfacebvci = msgb_bvci(msg);
|
2010-03-14 07:45:01 +00:00
|
|
|
* 3GPP TS 08.16 version 8.0.1 Release 1999 / ETSI TS 101 299 V8.0.1 (2002-05) */
|
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|
|
|
2010-04-26 17:18:54 +00:00
|
|
|
/* (C) 2009-2010 by Harald Welte <laforge@gnumonks.org>
|
2010-03-14 07:45:01 +00:00
|
|
|
*
|
|
|
|
* All Rights Reserved
|
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|
|
*
|
|
|
|
* 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
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|
|
* (at your option) any later version.
|
|
|
|
*
|
|
|
|
* This program is distributed in the hope that it will be useful,
|
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|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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|
|
|
* GNU General Public License for more details.
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|
|
|
*
|
|
|
|
* 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.,
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|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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|
|
*
|
|
|
|
*/
|
|
|
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|
|
|
/* 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
|
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|
|
* as an intermediate shim betwen BSSGP and the underlying medium. It doesn't
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|
|
|
* do much, apart from providing congestion notification and status indication.
|
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|
|
*
|
|
|
|
* Terms:
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|
|
* NS Network Service
|
|
|
|
* NSVC NS Virtual Connection
|
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|
|
* NSEI NS Entity Identifier
|
|
|
|
* NSVL NS Virtual Link
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|
|
* NSVLI NS Virtual Link Identifier
|
|
|
|
* BVC BSSGP Virtual Connection
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|
|
|
* BVCI BSSGP Virtual Connection Identifier
|
|
|
|
* NSVCG NS Virtual Connection Goup
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|
|
|
* 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.
|
|
|
|
*/
|
|
|
|
|
2010-05-13 11:58:08 +00:00
|
|
|
/* This implementation has the following limitations:
|
|
|
|
* o Only one NS-VC for each NSE: No load-sharing function
|
|
|
|
* o NSVCI 65535 and 65534 are reserved for internal use
|
|
|
|
* o Only UDP is supported as of now, no frame relay support
|
|
|
|
* o The IP Sub-Network-Service (SNS) as specified in 48.016 is not implemented
|
|
|
|
* o There are no BLOCK and UNBLOCK timers (yet?)
|
|
|
|
*/
|
|
|
|
|
2010-03-14 07:45:01 +00:00
|
|
|
#include <stdlib.h>
|
|
|
|
#include <unistd.h>
|
|
|
|
#include <errno.h>
|
2010-05-02 09:26:34 +00:00
|
|
|
#include <stdint.h>
|
2010-03-14 07:45:01 +00:00
|
|
|
|
|
|
|
#include <arpa/inet.h>
|
|
|
|
|
|
|
|
#include <openbsc/gsm_data.h>
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|
|
|
#include <osmocore/msgb.h>
|
|
|
|
#include <osmocore/tlv.h>
|
|
|
|
#include <osmocore/talloc.h>
|
2010-04-26 17:18:54 +00:00
|
|
|
#include <osmocore/select.h>
|
2010-05-13 09:45:07 +00:00
|
|
|
#include <osmocore/rate_ctr.h>
|
2010-03-14 07:45:01 +00:00
|
|
|
#include <openbsc/debug.h>
|
2010-05-11 04:20:54 +00:00
|
|
|
#include <openbsc/signal.h>
|
2010-03-14 07:45:01 +00:00
|
|
|
#include <openbsc/gprs_ns.h>
|
|
|
|
#include <openbsc/gprs_bssgp.h>
|
|
|
|
|
|
|
|
#define NS_ALLOC_SIZE 1024
|
|
|
|
|
|
|
|
static const struct tlv_definition ns_att_tlvdef = {
|
|
|
|
.def = {
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|
|
|
[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 },
|
|
|
|
},
|
|
|
|
};
|
|
|
|
|
2010-05-13 10:55:20 +00:00
|
|
|
enum ns_ctr {
|
|
|
|
NS_CTR_PKTS_IN,
|
|
|
|
NS_CTR_PKTS_OUT,
|
|
|
|
NS_CTR_BYTES_IN,
|
|
|
|
NS_CTR_BYTES_OUT,
|
|
|
|
NS_CTR_BLOCKED,
|
|
|
|
NS_CTR_DEAD,
|
|
|
|
};
|
|
|
|
|
2010-05-13 09:45:07 +00:00
|
|
|
static const struct rate_ctr_desc nsvc_ctr_description[] = {
|
|
|
|
{ "packets.in", "Packets at NS Level ( In)" },
|
2010-05-13 10:55:20 +00:00
|
|
|
{ "packets.out","Packets at NS Level (Out)" },
|
|
|
|
{ "bytes.in", "Bytes at NS Level ( In)" },
|
|
|
|
{ "bytes.out", "Bytes at NS Level (Out)" },
|
|
|
|
{ "blocked", "NS-VC Block count " },
|
|
|
|
{ "dead", "NS-VC gone dead count " },
|
2010-05-13 09:45:07 +00:00
|
|
|
};
|
|
|
|
|
|
|
|
static const struct rate_ctr_group_desc nsvc_ctrg_desc = {
|
2010-05-13 10:55:20 +00:00
|
|
|
.group_name_prefix = "ns.nsvc",
|
2010-05-13 09:45:07 +00:00
|
|
|
.group_description = "NSVC Peer Statistics",
|
|
|
|
.num_ctr = ARRAY_SIZE(nsvc_ctr_description),
|
|
|
|
.ctr_desc = nsvc_ctr_description,
|
|
|
|
};
|
|
|
|
|
2010-04-26 17:18:54 +00:00
|
|
|
/* Lookup struct gprs_nsvc based on NSVCI */
|
2010-05-15 21:02:24 +00:00
|
|
|
struct gprs_nsvc *nsvc_by_nsvci(struct gprs_ns_inst *nsi, uint16_t nsvci)
|
2010-04-26 17:18:54 +00:00
|
|
|
{
|
|
|
|
struct gprs_nsvc *nsvc;
|
|
|
|
llist_for_each_entry(nsvc, &nsi->gprs_nsvcs, list) {
|
|
|
|
if (nsvc->nsvci == nsvci)
|
|
|
|
return nsvc;
|
|
|
|
}
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
2010-04-30 17:54:29 +00:00
|
|
|
/* Lookup struct gprs_nsvc based on NSVCI */
|
2010-05-13 09:45:07 +00:00
|
|
|
struct gprs_nsvc *nsvc_by_nsei(struct gprs_ns_inst *nsi, uint16_t nsei)
|
2010-04-30 17:54:29 +00:00
|
|
|
{
|
|
|
|
struct gprs_nsvc *nsvc;
|
|
|
|
llist_for_each_entry(nsvc, &nsi->gprs_nsvcs, list) {
|
|
|
|
if (nsvc->nsei == nsei)
|
|
|
|
return nsvc;
|
|
|
|
}
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
2010-04-26 17:18:54 +00:00
|
|
|
/* 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) {
|
2010-05-12 11:56:39 +00:00
|
|
|
if (nsvc->ip.bts_addr.sin_addr.s_addr ==
|
|
|
|
sin->sin_addr.s_addr &&
|
|
|
|
nsvc->ip.bts_addr.sin_port == sin->sin_port)
|
2010-04-26 17:18:54 +00:00
|
|
|
return nsvc;
|
|
|
|
}
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
2010-05-03 18:55:10 +00:00
|
|
|
static void gprs_ns_timer_cb(void *data);
|
|
|
|
|
2010-05-13 09:45:07 +00:00
|
|
|
struct gprs_nsvc *nsvc_create(struct gprs_ns_inst *nsi, uint16_t nsvci)
|
2010-04-26 17:18:54 +00:00
|
|
|
{
|
|
|
|
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;
|
2010-05-03 18:55:10 +00:00
|
|
|
nsvc->timer.cb = gprs_ns_timer_cb;
|
|
|
|
nsvc->timer.data = nsvc;
|
2010-05-13 09:45:07 +00:00
|
|
|
nsvc->ctrg = rate_ctr_group_alloc(nsvc, &nsvc_ctrg_desc, nsvci);
|
2010-05-03 18:55:10 +00:00
|
|
|
|
2010-04-26 17:18:54 +00:00
|
|
|
llist_add(&nsvc->list, &nsi->gprs_nsvcs);
|
|
|
|
|
|
|
|
return nsvc;
|
|
|
|
}
|
2010-03-14 07:45:01 +00:00
|
|
|
|
2010-05-13 09:45:07 +00:00
|
|
|
void nsvc_delete(struct gprs_nsvc *nsvc)
|
2010-05-12 15:55:23 +00:00
|
|
|
{
|
|
|
|
if (bsc_timer_pending(&nsvc->timer))
|
|
|
|
bsc_del_timer(&nsvc->timer);
|
|
|
|
llist_del(&nsvc->list);
|
|
|
|
talloc_free(nsvc);
|
|
|
|
}
|
|
|
|
|
2010-05-11 08:15:26 +00:00
|
|
|
static void ns_dispatch_signal(struct gprs_nsvc *nsvc, unsigned int signal,
|
2010-05-11 04:20:54 +00:00
|
|
|
uint8_t cause)
|
|
|
|
{
|
|
|
|
struct ns_signal_data nssd;
|
|
|
|
|
|
|
|
nssd.nsvc = nsvc;
|
|
|
|
nssd.cause = cause;
|
|
|
|
|
|
|
|
dispatch_signal(SS_NS, signal, &nssd);
|
|
|
|
}
|
|
|
|
|
2010-03-14 07:45:01 +00:00
|
|
|
/* Section 10.3.2, Table 13 */
|
2010-05-02 07:37:45 +00:00
|
|
|
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" },
|
2010-05-03 18:55:10 +00:00
|
|
|
{ NS_CAUSE_PROTO_ERR_UNSPEC, "Protocol error, unspecified" },
|
2010-05-02 07:37:45 +00:00
|
|
|
{ NS_CAUSE_INVAL_ESSENT_IE, "Invalid essential IE" },
|
|
|
|
{ NS_CAUSE_MISSING_ESSENT_IE, "Missing essential IE" },
|
|
|
|
{ 0, NULL }
|
2010-03-14 07:45:01 +00:00
|
|
|
};
|
|
|
|
|
2010-05-02 07:37:45 +00:00
|
|
|
const char *gprs_ns_cause_str(enum ns_cause cause)
|
2010-03-14 07:45:01 +00:00
|
|
|
{
|
2010-05-02 07:37:45 +00:00
|
|
|
return get_value_string(ns_cause_str, cause);
|
2010-03-14 07:45:01 +00:00
|
|
|
}
|
|
|
|
|
2010-04-30 17:54:29 +00:00
|
|
|
static int nsip_sendmsg(struct gprs_nsvc *nsvc, struct msgb *msg);
|
2010-04-26 17:18:54 +00:00
|
|
|
|
2010-04-30 17:54:29 +00:00
|
|
|
static int gprs_ns_tx(struct gprs_nsvc *nsvc, struct msgb *msg)
|
2010-03-14 07:45:01 +00:00
|
|
|
{
|
2010-04-26 17:18:54 +00:00
|
|
|
int ret;
|
|
|
|
|
2010-05-13 09:45:07 +00:00
|
|
|
/* Increment number of Uplink bytes */
|
2010-05-13 10:55:20 +00:00
|
|
|
rate_ctr_inc(&nsvc->ctrg->ctr[NS_CTR_PKTS_OUT]);
|
|
|
|
rate_ctr_add(&nsvc->ctrg->ctr[NS_CTR_BYTES_OUT], msgb_l2len(msg));
|
2010-05-13 09:45:07 +00:00
|
|
|
|
2010-04-26 17:18:54 +00:00
|
|
|
switch (nsvc->nsi->ll) {
|
|
|
|
case GPRS_NS_LL_UDP:
|
2010-04-30 17:54:29 +00:00
|
|
|
ret = nsip_sendmsg(nsvc, msg);
|
2010-04-26 17:18:54 +00:00
|
|
|
break;
|
|
|
|
default:
|
2010-05-11 03:54:22 +00:00
|
|
|
LOGP(DNS, LOGL_ERROR, "unsupported NS linklayer %u\n", nsvc->nsi->ll);
|
2010-04-26 17:18:54 +00:00
|
|
|
msgb_free(msg);
|
|
|
|
ret = -EIO;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
return ret;
|
2010-03-14 07:45:01 +00:00
|
|
|
}
|
|
|
|
|
2010-05-02 09:26:34 +00:00
|
|
|
static int gprs_ns_tx_simple(struct gprs_nsvc *nsvc, uint8_t pdu_type)
|
2010-03-14 07:45:01 +00:00
|
|
|
{
|
|
|
|
struct msgb *msg = msgb_alloc(NS_ALLOC_SIZE, "GPRS/NS");
|
|
|
|
struct gprs_ns_hdr *nsh;
|
|
|
|
|
|
|
|
if (!msg)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
2010-05-13 09:45:07 +00:00
|
|
|
msg->l2h = msgb_put(msg, sizeof(*nsh));
|
|
|
|
nsh = (struct gprs_ns_hdr *) msg->l2h;
|
2010-03-14 07:45:01 +00:00
|
|
|
|
|
|
|
nsh->pdu_type = pdu_type;
|
|
|
|
|
2010-04-30 17:54:29 +00:00
|
|
|
return gprs_ns_tx(nsvc, msg);
|
2010-03-14 07:45:01 +00:00
|
|
|
}
|
|
|
|
|
2010-05-11 04:20:54 +00:00
|
|
|
int gprs_ns_tx_reset(struct gprs_nsvc *nsvc, uint8_t cause)
|
2010-05-03 18:55:10 +00:00
|
|
|
{
|
|
|
|
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;
|
|
|
|
|
2010-05-12 12:01:33 +00:00
|
|
|
LOGP(DNS, LOGL_INFO, "NSEI=%u Tx NS RESET (NSVCI=%u, cause=%s)\n",
|
|
|
|
nsvc->nsei, nsvc->nsvci, gprs_ns_cause_str(cause));
|
|
|
|
|
2010-05-13 09:45:07 +00:00
|
|
|
msg->l2h = msgb_put(msg, sizeof(*nsh));
|
|
|
|
nsh = (struct gprs_ns_hdr *) msg->l2h;
|
2010-05-03 18:55:10 +00:00
|
|
|
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);
|
|
|
|
|
|
|
|
}
|
|
|
|
|
2010-05-12 09:48:44 +00:00
|
|
|
int gprs_ns_tx_status(struct gprs_nsvc *nsvc, uint8_t cause,
|
|
|
|
uint16_t bvci, struct msgb *orig_msg)
|
|
|
|
{
|
|
|
|
struct msgb *msg = msgb_alloc(NS_ALLOC_SIZE, "GPRS/NS");
|
|
|
|
struct gprs_ns_hdr *nsh;
|
|
|
|
uint16_t nsvci = htons(nsvc->nsvci);
|
|
|
|
|
|
|
|
bvci = htons(bvci);
|
|
|
|
|
|
|
|
if (!msg)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
2010-05-15 21:02:24 +00:00
|
|
|
LOGP(DNS, LOGL_NOTICE, "NSEI=%u Tx NS STATUS (NSVCI=%u, cause=%s)\n",
|
2010-05-12 12:01:33 +00:00
|
|
|
nsvc->nsei, nsvc->nsvci, gprs_ns_cause_str(cause));
|
|
|
|
|
2010-05-13 09:45:07 +00:00
|
|
|
msg->l2h = msgb_put(msg, sizeof(*nsh));
|
|
|
|
nsh = (struct gprs_ns_hdr *) msg->l2h;
|
2010-05-12 09:48:44 +00:00
|
|
|
nsh->pdu_type = NS_PDUT_STATUS;
|
|
|
|
|
|
|
|
msgb_tvlv_put(msg, NS_IE_CAUSE, 1, &cause);
|
|
|
|
|
|
|
|
/* Section 9.2.7.1: Static conditions for NS-VCI */
|
|
|
|
if (cause == NS_CAUSE_NSVC_BLOCKED ||
|
|
|
|
cause == NS_CAUSE_NSVC_UNKNOWN)
|
|
|
|
msgb_tvlv_put(msg, NS_IE_VCI, 2, (uint8_t *)&nsvci);
|
|
|
|
|
|
|
|
/* Section 9.2.7.2: Static conditions for NS PDU */
|
|
|
|
switch (cause) {
|
|
|
|
case NS_CAUSE_SEM_INCORR_PDU:
|
|
|
|
case NS_CAUSE_PDU_INCOMP_PSTATE:
|
|
|
|
case NS_CAUSE_PROTO_ERR_UNSPEC:
|
|
|
|
case NS_CAUSE_INVAL_ESSENT_IE:
|
|
|
|
case NS_CAUSE_MISSING_ESSENT_IE:
|
|
|
|
msgb_tvlv_put(msg, NS_IE_PDU, msgb_l2len(orig_msg),
|
|
|
|
orig_msg->l2h);
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Section 9.2.7.3: Static conditions for BVCI */
|
|
|
|
if (cause == NS_CAUSE_BVCI_UNKNOWN)
|
|
|
|
msgb_tvlv_put(msg, NS_IE_VCI, 2, (uint8_t *)&bvci);
|
|
|
|
|
|
|
|
return gprs_ns_tx(nsvc, msg);
|
|
|
|
}
|
|
|
|
|
2010-05-11 04:20:54 +00:00
|
|
|
int gprs_ns_tx_block(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);
|
|
|
|
|
|
|
|
if (!msg)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
2010-05-12 12:01:33 +00:00
|
|
|
LOGP(DNS, LOGL_INFO, "NSEI=%u Tx NS BLOCK (NSVCI=%u, cause=%s)\n",
|
|
|
|
nsvc->nsei, nsvc->nsvci, gprs_ns_cause_str(cause));
|
|
|
|
|
2010-05-11 04:20:54 +00:00
|
|
|
/* be conservative and mark it as blocked even now! */
|
|
|
|
nsvc->state |= NSE_S_BLOCKED;
|
2010-05-13 10:55:20 +00:00
|
|
|
rate_ctr_inc(&nsvc->ctrg->ctr[NS_CTR_BLOCKED]);
|
2010-05-11 04:20:54 +00:00
|
|
|
|
2010-05-13 09:45:07 +00:00
|
|
|
msg->l2h = msgb_put(msg, sizeof(*nsh));
|
|
|
|
nsh = (struct gprs_ns_hdr *) msg->l2h;
|
2010-05-11 04:20:54 +00:00
|
|
|
nsh->pdu_type = NS_PDUT_BLOCK;
|
|
|
|
|
|
|
|
msgb_tvlv_put(msg, NS_IE_CAUSE, 1, &cause);
|
|
|
|
msgb_tvlv_put(msg, NS_IE_VCI, 2, (uint8_t *) &nsvci);
|
|
|
|
|
|
|
|
return gprs_ns_tx(nsvc, msg);
|
|
|
|
}
|
|
|
|
|
|
|
|
int gprs_ns_tx_unblock(struct gprs_nsvc *nsvc)
|
|
|
|
{
|
2010-05-12 12:01:33 +00:00
|
|
|
LOGP(DNS, LOGL_INFO, "NSEI=%u Tx NS UNBLOCK (NSVCI=%u)\n",
|
|
|
|
nsvc->nsei, nsvc->nsvci);
|
|
|
|
|
2010-05-11 04:20:54 +00:00
|
|
|
return gprs_ns_tx_simple(nsvc, NS_PDUT_UNBLOCK);
|
|
|
|
}
|
|
|
|
|
2010-05-12 12:11:45 +00:00
|
|
|
int gprs_ns_tx_alive(struct gprs_nsvc *nsvc)
|
|
|
|
{
|
|
|
|
LOGP(DNS, LOGL_DEBUG, "NSEI=%u Tx NS ALIVE (NSVCI=%u)\n",
|
|
|
|
nsvc->nsei, nsvc->nsvci);
|
|
|
|
|
|
|
|
return gprs_ns_tx_simple(nsvc, NS_PDUT_ALIVE);
|
|
|
|
}
|
|
|
|
|
|
|
|
int gprs_ns_tx_alive_ack(struct gprs_nsvc *nsvc)
|
|
|
|
{
|
|
|
|
LOGP(DNS, LOGL_DEBUG, "NSEI=%u Tx NS ALIVE_ACK (NSVCI=%u)\n",
|
|
|
|
nsvc->nsei, nsvc->nsvci);
|
|
|
|
|
|
|
|
return gprs_ns_tx_simple(nsvc, NS_PDUT_ALIVE_ACK);
|
|
|
|
}
|
|
|
|
|
2010-05-12 17:19:53 +00:00
|
|
|
static const enum ns_timeout timer_mode_tout[_NSVC_TIMER_NR] = {
|
|
|
|
[NSVC_TIMER_TNS_RESET] = NS_TOUT_TNS_RESET,
|
|
|
|
[NSVC_TIMER_TNS_ALIVE] = NS_TOUT_TNS_ALIVE,
|
|
|
|
[NSVC_TIMER_TNS_TEST] = NS_TOUT_TNS_TEST,
|
2010-05-03 18:55:10 +00:00
|
|
|
};
|
|
|
|
|
2010-05-12 12:21:52 +00:00
|
|
|
static const struct value_string timer_mode_strs[] = {
|
|
|
|
{ NSVC_TIMER_TNS_RESET, "tns-reset" },
|
|
|
|
{ NSVC_TIMER_TNS_ALIVE, "tns-alive" },
|
|
|
|
{ NSVC_TIMER_TNS_TEST, "tns-test" },
|
|
|
|
{ 0, NULL }
|
|
|
|
};
|
|
|
|
|
2010-05-03 18:55:10 +00:00
|
|
|
static void nsvc_start_timer(struct gprs_nsvc *nsvc, enum nsvc_timer_mode mode)
|
|
|
|
{
|
2010-05-12 17:19:53 +00:00
|
|
|
enum ns_timeout tout = timer_mode_tout[mode];
|
|
|
|
unsigned int seconds = nsvc->nsi->timeout[tout];
|
|
|
|
|
2010-05-12 13:55:36 +00:00
|
|
|
DEBUGP(DNS, "NSEI=%u Starting timer in mode %s (%u seconds)\n",
|
|
|
|
nsvc->nsei, get_value_string(timer_mode_strs, mode),
|
2010-05-12 17:19:53 +00:00
|
|
|
seconds);
|
2010-05-12 12:21:52 +00:00
|
|
|
|
2010-05-03 18:55:10 +00:00
|
|
|
if (bsc_timer_pending(&nsvc->timer))
|
|
|
|
bsc_del_timer(&nsvc->timer);
|
|
|
|
|
|
|
|
nsvc->timer_mode = mode;
|
2010-05-12 17:19:53 +00:00
|
|
|
bsc_schedule_timer(&nsvc->timer, seconds, 0);
|
2010-05-03 18:55:10 +00:00
|
|
|
}
|
|
|
|
|
2010-05-03 18:16:13 +00:00
|
|
|
static void gprs_ns_timer_cb(void *data)
|
2010-03-14 07:45:01 +00:00
|
|
|
{
|
|
|
|
struct gprs_nsvc *nsvc = data;
|
2010-05-12 17:19:53 +00:00
|
|
|
enum ns_timeout tout = timer_mode_tout[nsvc->timer_mode];
|
|
|
|
unsigned int seconds = nsvc->nsi->timeout[tout];
|
2010-03-14 07:45:01 +00:00
|
|
|
|
2010-05-12 13:55:36 +00:00
|
|
|
DEBUGP(DNS, "NSEI=%u Timer expired in mode %s (%u seconds)\n",
|
|
|
|
nsvc->nsei, get_value_string(timer_mode_strs, nsvc->timer_mode),
|
2010-05-12 17:19:53 +00:00
|
|
|
seconds);
|
2010-05-12 12:21:52 +00:00
|
|
|
|
2010-05-03 18:16:13 +00:00
|
|
|
switch (nsvc->timer_mode) {
|
|
|
|
case NSVC_TIMER_TNS_ALIVE:
|
2010-03-14 07:45:01 +00:00
|
|
|
/* Tns-alive case: we expired without response ! */
|
|
|
|
nsvc->alive_retries++;
|
2010-05-12 17:19:53 +00:00
|
|
|
if (nsvc->alive_retries >
|
|
|
|
nsvc->nsi->timeout[NS_TOUT_TNS_ALIVE_RETRIES]) {
|
2010-03-14 07:45:01 +00:00
|
|
|
/* mark as dead and blocked */
|
|
|
|
nsvc->state = NSE_S_BLOCKED;
|
2010-05-13 10:55:20 +00:00
|
|
|
rate_ctr_inc(&nsvc->ctrg->ctr[NS_CTR_BLOCKED]);
|
|
|
|
rate_ctr_inc(&nsvc->ctrg->ctr[NS_CTR_DEAD]);
|
2010-05-11 22:16:57 +00:00
|
|
|
LOGP(DNS, LOGL_NOTICE,
|
|
|
|
"NSEI=%u Tns-alive expired more then "
|
2010-05-03 18:55:10 +00:00
|
|
|
"%u times, blocking NS-VC\n", nsvc->nsei,
|
2010-05-12 17:19:53 +00:00
|
|
|
nsvc->nsi->timeout[NS_TOUT_TNS_ALIVE_RETRIES]);
|
2010-05-12 13:28:25 +00:00
|
|
|
ns_dispatch_signal(nsvc, S_NS_ALIVE_EXP, 0);
|
2010-05-11 22:16:57 +00:00
|
|
|
ns_dispatch_signal(nsvc, S_NS_BLOCK, NS_CAUSE_NSVC_BLOCKED);
|
2010-03-14 07:45:01 +00:00
|
|
|
return;
|
|
|
|
}
|
2010-05-12 12:11:45 +00:00
|
|
|
/* Tns-test case: send NS-ALIVE PDU */
|
|
|
|
gprs_ns_tx_alive(nsvc);
|
|
|
|
/* start Tns-alive timer */
|
2010-05-03 18:55:10 +00:00
|
|
|
nsvc_start_timer(nsvc, NSVC_TIMER_TNS_ALIVE);
|
2010-05-03 18:16:13 +00:00
|
|
|
break;
|
|
|
|
case NSVC_TIMER_TNS_TEST:
|
2010-03-14 07:45:01 +00:00
|
|
|
/* Tns-test case: send NS-ALIVE PDU */
|
2010-05-12 12:11:45 +00:00
|
|
|
gprs_ns_tx_alive(nsvc);
|
|
|
|
/* start Tns-alive timer (transition into faster
|
|
|
|
* alive retransmissions) */
|
2010-05-12 12:21:52 +00:00
|
|
|
nsvc->alive_retries = 0;
|
2010-05-03 18:55:10 +00:00
|
|
|
nsvc_start_timer(nsvc, NSVC_TIMER_TNS_ALIVE);
|
|
|
|
break;
|
|
|
|
case NSVC_TIMER_TNS_RESET:
|
|
|
|
/* Chapter 7.3: Re-send the RESET */
|
2010-05-03 19:05:24 +00:00
|
|
|
gprs_ns_tx_reset(nsvc, NS_CAUSE_OM_INTERVENTION);
|
2010-05-12 09:48:44 +00:00
|
|
|
/* Re-start Tns-reset timer */
|
2010-05-03 18:55:10 +00:00
|
|
|
nsvc_start_timer(nsvc, NSVC_TIMER_TNS_RESET);
|
2010-05-03 18:16:13 +00:00
|
|
|
break;
|
2010-05-11 08:15:26 +00:00
|
|
|
case _NSVC_TIMER_NR:
|
|
|
|
break;
|
2010-03-14 07:45:01 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Section 9.2.6 */
|
2010-03-17 16:01:43 +00:00
|
|
|
static int gprs_ns_tx_reset_ack(struct gprs_nsvc *nsvc)
|
2010-03-14 07:45:01 +00:00
|
|
|
{
|
|
|
|
struct msgb *msg = msgb_alloc(NS_ALLOC_SIZE, "GPRS/NS");
|
|
|
|
struct gprs_ns_hdr *nsh;
|
2010-05-02 09:26:34 +00:00
|
|
|
uint16_t nsvci, nsei;
|
2010-03-14 07:45:01 +00:00
|
|
|
|
|
|
|
if (!msg)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
2010-03-17 16:01:43 +00:00
|
|
|
nsvci = htons(nsvc->nsvci);
|
|
|
|
nsei = htons(nsvc->nsei);
|
2010-03-14 07:45:01 +00:00
|
|
|
|
2010-05-13 09:45:07 +00:00
|
|
|
msg->l2h = msgb_put(msg, sizeof(*nsh));
|
|
|
|
nsh = (struct gprs_ns_hdr *) msg->l2h;
|
2010-03-14 07:45:01 +00:00
|
|
|
|
|
|
|
nsh->pdu_type = NS_PDUT_RESET_ACK;
|
|
|
|
|
2010-05-11 22:16:57 +00:00
|
|
|
LOGP(DNS, LOGL_INFO, "NSEI=%u Tx NS RESET ACK (NSVCI=%u)\n",
|
2010-05-03 16:54:12 +00:00
|
|
|
nsvc->nsei, nsvc->nsvci);
|
2010-03-17 16:01:43 +00:00
|
|
|
|
2010-05-02 09:26:34 +00:00
|
|
|
msgb_tvlv_put(msg, NS_IE_VCI, 2, (uint8_t *)&nsvci);
|
|
|
|
msgb_tvlv_put(msg, NS_IE_NSEI, 2, (uint8_t *)&nsei);
|
2010-03-14 07:45:01 +00:00
|
|
|
|
2010-04-30 17:54:29 +00:00
|
|
|
return gprs_ns_tx(nsvc, msg);
|
2010-03-14 07:45:01 +00:00
|
|
|
}
|
|
|
|
|
2010-04-30 17:54:29 +00:00
|
|
|
/* Section 9.2.10: transmit side / NS-UNITDATA-REQUEST primitive */
|
|
|
|
int gprs_ns_sendmsg(struct gprs_ns_inst *nsi, struct msgb *msg)
|
2010-03-14 07:45:01 +00:00
|
|
|
{
|
2010-04-30 17:54:29 +00:00
|
|
|
struct gprs_nsvc *nsvc;
|
2010-03-14 07:45:01 +00:00
|
|
|
struct gprs_ns_hdr *nsh;
|
2010-05-02 09:26:34 +00:00
|
|
|
uint16_t bvci = msgb_bvci(msg);
|
2010-04-30 17:54:29 +00:00
|
|
|
|
|
|
|
nsvc = nsvc_by_nsei(nsi, msgb_nsei(msg));
|
|
|
|
if (!nsvc) {
|
2010-05-11 03:54:22 +00:00
|
|
|
LOGP(DNS, LOGL_ERROR, "Unable to resolve NSEI %u "
|
2010-05-03 16:54:12 +00:00
|
|
|
"to NS-VC!\n", msgb_nsei(msg));
|
2010-04-30 17:54:29 +00:00
|
|
|
return -EINVAL;
|
|
|
|
}
|
2010-03-14 07:45:01 +00:00
|
|
|
|
2010-05-03 18:55:10 +00:00
|
|
|
if (!(nsvc->state & NSE_S_ALIVE)) {
|
2010-05-11 03:54:22 +00:00
|
|
|
LOGP(DNS, LOGL_ERROR, "NSEI=%u is not alive, cannot send\n",
|
2010-05-03 18:55:10 +00:00
|
|
|
nsvc->nsei);
|
|
|
|
return -EBUSY;
|
|
|
|
}
|
|
|
|
if (nsvc->state & NSE_S_BLOCKED) {
|
2010-05-11 03:54:22 +00:00
|
|
|
LOGP(DNS, LOGL_ERROR, "NSEI=%u is blocked, cannot send\n",
|
2010-05-03 18:55:10 +00:00
|
|
|
nsvc->nsei);
|
|
|
|
return -EBUSY;
|
|
|
|
}
|
|
|
|
|
2010-05-13 10:18:49 +00:00
|
|
|
msg->l2h = msgb_push(msg, sizeof(*nsh) + 3);
|
|
|
|
nsh = (struct gprs_ns_hdr *) msg->l2h;
|
2010-03-14 07:45:01 +00:00
|
|
|
if (!nsh) {
|
2010-05-11 03:54:22 +00:00
|
|
|
LOGP(DNS, LOGL_ERROR, "Not enough headroom for NS header\n");
|
2010-03-14 07:45:01 +00:00
|
|
|
return -EIO;
|
|
|
|
}
|
|
|
|
|
|
|
|
nsh->pdu_type = NS_PDUT_UNITDATA;
|
|
|
|
/* spare octet in data[0] */
|
|
|
|
nsh->data[1] = bvci >> 8;
|
|
|
|
nsh->data[2] = bvci & 0xff;
|
|
|
|
|
2010-04-30 17:54:29 +00:00
|
|
|
return gprs_ns_tx(nsvc, msg);
|
2010-03-14 07:45:01 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/* Section 9.2.10: receive side */
|
2010-04-30 17:54:29 +00:00
|
|
|
static int gprs_ns_rx_unitdata(struct gprs_nsvc *nsvc, struct msgb *msg)
|
2010-03-14 07:45:01 +00:00
|
|
|
{
|
|
|
|
struct gprs_ns_hdr *nsh = (struct gprs_ns_hdr *)msg->l2h;
|
2010-05-02 09:26:34 +00:00
|
|
|
uint16_t bvci;
|
2010-03-14 07:45:01 +00:00
|
|
|
|
2010-05-12 09:48:44 +00:00
|
|
|
if (nsvc->state & NSE_S_BLOCKED)
|
|
|
|
return gprs_ns_tx_status(nsvc, NS_CAUSE_NSVC_BLOCKED,
|
|
|
|
0, msg);
|
|
|
|
|
2010-03-14 07:45:01 +00:00
|
|
|
/* spare octet in data[0] */
|
|
|
|
bvci = nsh->data[1] << 8 | nsh->data[2];
|
2010-05-02 07:50:42 +00:00
|
|
|
msgb_bssgph(msg) = &nsh->data[3];
|
2010-05-02 09:19:37 +00:00
|
|
|
msgb_bvci(msg) = bvci;
|
2010-03-14 07:45:01 +00:00
|
|
|
|
|
|
|
/* call upper layer (BSSGP) */
|
2010-04-26 17:18:54 +00:00
|
|
|
return nsvc->nsi->cb(GPRS_NS_EVT_UNIT_DATA, nsvc, msg, bvci);
|
2010-03-14 07:45:01 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/* Section 9.2.7 */
|
2010-04-30 17:54:29 +00:00
|
|
|
static int gprs_ns_rx_status(struct gprs_nsvc *nsvc, struct msgb *msg)
|
2010-03-14 07:45:01 +00:00
|
|
|
{
|
2010-04-26 17:18:54 +00:00
|
|
|
struct gprs_ns_hdr *nsh = (struct gprs_ns_hdr *) msg->l2h;
|
2010-03-14 07:45:01 +00:00
|
|
|
struct tlv_parsed tp;
|
2010-05-02 09:26:34 +00:00
|
|
|
uint8_t cause;
|
2010-03-14 07:45:01 +00:00
|
|
|
int rc;
|
|
|
|
|
2010-05-11 22:16:57 +00:00
|
|
|
LOGP(DNS, LOGL_INFO, "NSEI=%u NS STATUS ", nsvc->nsei);
|
2010-03-14 07:45:01 +00:00
|
|
|
|
|
|
|
rc = tlv_parse(&tp, &ns_att_tlvdef, nsh->data, msgb_l2len(msg), 0, 0);
|
|
|
|
|
|
|
|
if (!TLVP_PRESENT(&tp, NS_IE_CAUSE)) {
|
2010-05-11 22:16:57 +00:00
|
|
|
LOGPC(DNS, LOGL_INFO, "missing cause IE\n");
|
2010-03-14 07:45:01 +00:00
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
cause = *TLVP_VAL(&tp, NS_IE_CAUSE);
|
2010-05-11 22:16:57 +00:00
|
|
|
LOGPC(DNS, LOGL_INFO, "cause=%s\n", gprs_ns_cause_str(cause));
|
2010-03-14 07:45:01 +00:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Section 7.3 */
|
2010-04-30 17:54:29 +00:00
|
|
|
static int gprs_ns_rx_reset(struct gprs_nsvc *nsvc, struct msgb *msg)
|
2010-03-14 07:45:01 +00:00
|
|
|
{
|
|
|
|
struct gprs_ns_hdr *nsh = (struct gprs_ns_hdr *) msg->l2h;
|
|
|
|
struct tlv_parsed tp;
|
2010-05-02 09:26:34 +00:00
|
|
|
uint8_t *cause;
|
|
|
|
uint16_t *nsvci, *nsei;
|
2010-03-14 07:45:01 +00:00
|
|
|
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)) {
|
2010-05-11 03:54:22 +00:00
|
|
|
LOGP(DNS, LOGL_ERROR, "NS RESET Missing mandatory IE\n");
|
2010-05-12 09:48:44 +00:00
|
|
|
gprs_ns_tx_status(nsvc, NS_CAUSE_MISSING_ESSENT_IE, 0, msg);
|
2010-03-14 07:45:01 +00:00
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
2010-05-02 09:26:34 +00:00
|
|
|
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);
|
2010-03-14 07:45:01 +00:00
|
|
|
|
2010-05-11 22:16:57 +00:00
|
|
|
LOGP(DNS, LOGL_INFO, "NSEI=%u Rx NS RESET (NSVCI=%u, cause=%s)\n",
|
2010-05-03 16:54:12 +00:00
|
|
|
nsvc->nsvci, nsvc->nsei, gprs_ns_cause_str(*cause));
|
|
|
|
|
2010-05-12 09:48:44 +00:00
|
|
|
/* Mark NS-VC as blocked and alive */
|
2010-03-17 16:01:43 +00:00
|
|
|
nsvc->state = NSE_S_BLOCKED | NSE_S_ALIVE;
|
2010-05-11 16:18:31 +00:00
|
|
|
|
2010-03-17 16:01:43 +00:00
|
|
|
nsvc->nsei = ntohs(*nsei);
|
|
|
|
nsvc->nsvci = ntohs(*nsvci);
|
2010-03-14 07:45:01 +00:00
|
|
|
|
|
|
|
/* start the test procedure */
|
2010-05-03 18:55:10 +00:00
|
|
|
nsvc_start_timer(nsvc, NSVC_TIMER_TNS_ALIVE);
|
2010-03-14 07:45:01 +00:00
|
|
|
|
2010-05-11 04:20:54 +00:00
|
|
|
/* inform interested parties about the fact that this NSVC
|
|
|
|
* has received RESET */
|
2010-05-11 08:15:26 +00:00
|
|
|
ns_dispatch_signal(nsvc, S_NS_RESET, *cause);
|
2010-05-11 04:20:54 +00:00
|
|
|
|
2010-03-17 16:01:43 +00:00
|
|
|
return gprs_ns_tx_reset_ack(nsvc);
|
2010-03-14 07:45:01 +00:00
|
|
|
}
|
|
|
|
|
2010-05-11 04:20:54 +00:00
|
|
|
static int gprs_ns_rx_block(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;
|
|
|
|
|
2010-05-11 22:16:57 +00:00
|
|
|
LOGP(DNS, LOGL_INFO, "NSEI=%u Rx NS BLOCK\n", nsvc->nsei);
|
2010-05-11 04:20:54 +00:00
|
|
|
|
|
|
|
nsvc->state |= NSE_S_BLOCKED;
|
|
|
|
|
|
|
|
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)) {
|
|
|
|
LOGP(DNS, LOGL_ERROR, "NS RESET Missing mandatory IE\n");
|
2010-05-12 09:48:44 +00:00
|
|
|
gprs_ns_tx_status(nsvc, NS_CAUSE_MISSING_ESSENT_IE, 0, msg);
|
2010-05-11 04:20:54 +00:00
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
cause = (uint8_t *) TLVP_VAL(&tp, NS_IE_CAUSE);
|
|
|
|
//nsvci = (uint16_t *) TLVP_VAL(&tp, NS_IE_VCI);
|
|
|
|
|
2010-05-11 08:15:26 +00:00
|
|
|
ns_dispatch_signal(nsvc, S_NS_BLOCK, *cause);
|
2010-05-13 10:55:20 +00:00
|
|
|
rate_ctr_inc(&nsvc->ctrg->ctr[NS_CTR_BLOCKED]);
|
2010-05-11 04:20:54 +00:00
|
|
|
|
|
|
|
return gprs_ns_tx_simple(nsvc, NS_PDUT_BLOCK_ACK);
|
|
|
|
}
|
|
|
|
|
2010-03-14 07:45:01 +00:00
|
|
|
/* main entry point, here incoming NS frames enter */
|
2010-04-26 17:18:54 +00:00
|
|
|
int gprs_ns_rcvmsg(struct gprs_ns_inst *nsi, struct msgb *msg,
|
|
|
|
struct sockaddr_in *saddr)
|
2010-03-14 07:45:01 +00:00
|
|
|
{
|
|
|
|
struct gprs_ns_hdr *nsh = (struct gprs_ns_hdr *) msg->l2h;
|
2010-04-26 17:18:54 +00:00
|
|
|
struct gprs_nsvc *nsvc;
|
2010-03-14 07:45:01 +00:00
|
|
|
int rc = 0;
|
|
|
|
|
2010-04-26 17:18:54 +00:00
|
|
|
/* look up the NSVC based on source address */
|
|
|
|
nsvc = nsvc_by_rem_addr(nsi, saddr);
|
|
|
|
if (!nsvc) {
|
2010-05-11 16:30:37 +00:00
|
|
|
struct tlv_parsed tp;
|
|
|
|
uint16_t nsei;
|
2010-04-26 17:18:54 +00:00
|
|
|
/* Only the RESET procedure creates a new NSVC */
|
2010-05-03 16:54:12 +00:00
|
|
|
if (nsh->pdu_type != NS_PDUT_RESET) {
|
2010-05-13 11:58:08 +00:00
|
|
|
/* Since we have no NSVC, we have to use a fake */
|
|
|
|
nsvc = nsi->unknown_nsvc;
|
|
|
|
LOGP(DNS, LOGL_INFO, "Rejecting NS PDU type 0x%0x "
|
2010-05-11 16:38:36 +00:00
|
|
|
"from %s:%u for non-existing NS-VC\n",
|
|
|
|
nsh->pdu_type, inet_ntoa(saddr->sin_addr),
|
|
|
|
ntohs(saddr->sin_port));
|
2010-05-13 11:58:08 +00:00
|
|
|
nsvc->nsvci = nsvc->nsei = 0xfffe;
|
|
|
|
nsvc->ip.bts_addr = *saddr;
|
|
|
|
nsvc->state = NSE_S_ALIVE;
|
|
|
|
return gprs_ns_tx_status(nsvc,
|
2010-05-12 13:51:08 +00:00
|
|
|
NS_CAUSE_PDU_INCOMP_PSTATE, 0,
|
|
|
|
msg);
|
2010-05-03 16:54:12 +00:00
|
|
|
}
|
2010-05-11 16:30:37 +00:00
|
|
|
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)) {
|
|
|
|
LOGP(DNS, LOGL_ERROR, "NS RESET Missing mandatory IE\n");
|
2010-05-12 09:48:44 +00:00
|
|
|
gprs_ns_tx_status(nsvc, NS_CAUSE_MISSING_ESSENT_IE, 0,
|
|
|
|
msg);
|
2010-05-11 16:30:37 +00:00
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
nsei = ntohs(*(uint16_t *)TLVP_VAL(&tp, NS_IE_NSEI));
|
|
|
|
/* Check if we already know this NSEI, the remote end might
|
|
|
|
* simply have changed addresses, or it is a SGSN */
|
|
|
|
nsvc = nsvc_by_nsei(nsi, nsei);
|
|
|
|
if (!nsvc) {
|
|
|
|
LOGP(DNS, 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);
|
|
|
|
}
|
2010-05-11 16:40:45 +00:00
|
|
|
/* Update the remote peer IP address/port */
|
|
|
|
nsvc->ip.bts_addr = *saddr;
|
2010-05-03 16:54:12 +00:00
|
|
|
} else
|
|
|
|
msgb_nsei(msg) = nsvc->nsei;
|
2010-03-17 16:01:43 +00:00
|
|
|
|
2010-05-13 09:45:07 +00:00
|
|
|
/* Increment number of Incoming bytes */
|
2010-05-13 10:55:20 +00:00
|
|
|
rate_ctr_inc(&nsvc->ctrg->ctr[NS_CTR_PKTS_IN]);
|
|
|
|
rate_ctr_add(&nsvc->ctrg->ctr[NS_CTR_BYTES_IN], msgb_l2len(msg));
|
2010-05-13 09:45:07 +00:00
|
|
|
|
2010-03-14 07:45:01 +00:00
|
|
|
switch (nsh->pdu_type) {
|
|
|
|
case NS_PDUT_ALIVE:
|
2010-05-12 15:55:23 +00:00
|
|
|
/* If we're dead and blocked and suddenly receive a
|
|
|
|
* NS-ALIVE out of the blue, we might have been re-started
|
|
|
|
* and should send a NS-RESET to make sure everything recovers
|
|
|
|
* fine. */
|
|
|
|
if (nsvc->state == NSE_S_BLOCKED)
|
|
|
|
rc = gprs_ns_tx_reset(nsvc, NS_CAUSE_PDU_INCOMP_PSTATE);
|
|
|
|
else
|
|
|
|
rc = gprs_ns_tx_alive_ack(nsvc);
|
2010-03-14 07:45:01 +00:00
|
|
|
break;
|
|
|
|
case NS_PDUT_ALIVE_ACK:
|
2010-05-15 21:02:24 +00:00
|
|
|
/* stop Tns-alive and start Tns-test */
|
2010-05-03 18:55:10 +00:00
|
|
|
nsvc_start_timer(nsvc, NSVC_TIMER_TNS_TEST);
|
2010-05-03 19:11:22 +00:00
|
|
|
if (nsvc->remote_end_is_sgsn) {
|
|
|
|
/* FIXME: this should be one level higher */
|
|
|
|
if (nsvc->state & NSE_S_BLOCKED)
|
2010-05-12 09:48:44 +00:00
|
|
|
rc = gprs_ns_tx_unblock(nsvc);
|
2010-05-03 19:11:22 +00:00
|
|
|
}
|
2010-03-14 07:45:01 +00:00
|
|
|
break;
|
|
|
|
case NS_PDUT_UNITDATA:
|
|
|
|
/* actual user data */
|
2010-04-30 17:54:29 +00:00
|
|
|
rc = gprs_ns_rx_unitdata(nsvc, msg);
|
2010-03-14 07:45:01 +00:00
|
|
|
break;
|
|
|
|
case NS_PDUT_STATUS:
|
2010-04-30 17:54:29 +00:00
|
|
|
rc = gprs_ns_rx_status(nsvc, msg);
|
2010-03-14 07:45:01 +00:00
|
|
|
break;
|
|
|
|
case NS_PDUT_RESET:
|
2010-04-30 17:54:29 +00:00
|
|
|
rc = gprs_ns_rx_reset(nsvc, msg);
|
2010-03-14 07:45:01 +00:00
|
|
|
break;
|
|
|
|
case NS_PDUT_RESET_ACK:
|
2010-05-11 22:16:57 +00:00
|
|
|
LOGP(DNS, LOGL_INFO, "NSEI=%u Rx NS RESET ACK\n", nsvc->nsei);
|
2010-05-12 09:48:44 +00:00
|
|
|
/* mark NS-VC as blocked + active */
|
|
|
|
nsvc->state = NSE_S_BLOCKED | NSE_S_ALIVE;
|
2010-04-26 17:18:54 +00:00
|
|
|
nsvc->remote_state = NSE_S_BLOCKED | NSE_S_ALIVE;
|
2010-05-13 10:55:20 +00:00
|
|
|
rate_ctr_inc(&nsvc->ctrg->ctr[NS_CTR_BLOCKED]);
|
2010-05-14 11:53:08 +00:00
|
|
|
if (nsvc->persistent || nsvc->remote_end_is_sgsn) {
|
2010-05-03 18:55:10 +00:00
|
|
|
/* stop RESET timer */
|
|
|
|
bsc_del_timer(&nsvc->timer);
|
|
|
|
}
|
2010-05-15 21:02:24 +00:00
|
|
|
/* Initiate TEST proc.: Send ALIVE and start timer */
|
|
|
|
rc = gprs_ns_tx_simple(nsvc, NS_PDUT_ALIVE);
|
|
|
|
nsvc_start_timer(nsvc, NSVC_TIMER_TNS_ALIVE);
|
2010-03-14 07:45:01 +00:00
|
|
|
break;
|
|
|
|
case NS_PDUT_UNBLOCK:
|
|
|
|
/* Section 7.2: unblocking procedure */
|
2010-05-11 22:16:57 +00:00
|
|
|
LOGP(DNS, LOGL_INFO, "NSEI=%u Rx NS UNBLOCK\n", nsvc->nsei);
|
2010-03-14 07:45:01 +00:00
|
|
|
nsvc->state &= ~NSE_S_BLOCKED;
|
2010-05-11 04:20:54 +00:00
|
|
|
ns_dispatch_signal(nsvc, S_NS_UNBLOCK, 0);
|
2010-03-17 16:01:43 +00:00
|
|
|
rc = gprs_ns_tx_simple(nsvc, NS_PDUT_UNBLOCK_ACK);
|
2010-03-14 07:45:01 +00:00
|
|
|
break;
|
|
|
|
case NS_PDUT_UNBLOCK_ACK:
|
2010-05-11 22:16:57 +00:00
|
|
|
LOGP(DNS, LOGL_INFO, "NSEI=%u Rx NS UNBLOCK ACK\n", nsvc->nsei);
|
2010-05-12 09:48:44 +00:00
|
|
|
/* mark NS-VC as unblocked + active */
|
|
|
|
nsvc->state = NSE_S_ALIVE;
|
2010-04-26 17:18:54 +00:00
|
|
|
nsvc->remote_state = NSE_S_ALIVE;
|
2010-05-12 14:18:46 +00:00
|
|
|
ns_dispatch_signal(nsvc, S_NS_UNBLOCK, 0);
|
2010-03-14 07:45:01 +00:00
|
|
|
break;
|
|
|
|
case NS_PDUT_BLOCK:
|
2010-05-11 04:20:54 +00:00
|
|
|
rc = gprs_ns_rx_block(nsvc, msg);
|
2010-03-14 07:45:01 +00:00
|
|
|
break;
|
|
|
|
case NS_PDUT_BLOCK_ACK:
|
2010-05-11 22:16:57 +00:00
|
|
|
LOGP(DNS, LOGL_INFO, "NSEI=%u Rx NS BLOCK ACK\n", nsvc->nsei);
|
2010-04-26 17:18:54 +00:00
|
|
|
/* mark remote NS-VC as blocked + active */
|
|
|
|
nsvc->remote_state = NSE_S_BLOCKED | NSE_S_ALIVE;
|
2010-03-14 07:45:01 +00:00
|
|
|
break;
|
|
|
|
default:
|
2010-05-11 22:16:57 +00:00
|
|
|
LOGP(DNS, LOGL_NOTICE, "NSEI=%u Rx Unknown NS PDU type 0x%02x\n",
|
2010-05-03 16:54:12 +00:00
|
|
|
nsvc->nsei, nsh->pdu_type);
|
2010-03-14 07:45:01 +00:00
|
|
|
rc = -EINVAL;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
2010-04-26 17:18:54 +00:00
|
|
|
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);
|
2010-05-12 17:19:53 +00:00
|
|
|
nsi->timeout[NS_TOUT_TNS_BLOCK] = 3;
|
|
|
|
nsi->timeout[NS_TOUT_TNS_BLOCK_RETRIES] = 3;
|
|
|
|
nsi->timeout[NS_TOUT_TNS_RESET] = 3;
|
|
|
|
nsi->timeout[NS_TOUT_TNS_RESET_RETRIES] = 3;
|
|
|
|
nsi->timeout[NS_TOUT_TNS_TEST] = 30;
|
|
|
|
nsi->timeout[NS_TOUT_TNS_ALIVE] = 3;
|
|
|
|
nsi->timeout[NS_TOUT_TNS_ALIVE_RETRIES] = 10;
|
2010-04-26 17:18:54 +00:00
|
|
|
|
2010-05-13 12:20:56 +00:00
|
|
|
/* Create the dummy NSVC that we use for sending
|
|
|
|
* messages to non-existant/unknown NS-VC's */
|
2010-05-13 11:58:08 +00:00
|
|
|
nsi->unknown_nsvc = nsvc_create(nsi, 0xfffe);
|
2010-05-13 12:20:56 +00:00
|
|
|
llist_del(&nsi->unknown_nsvc->list);
|
2010-05-13 11:58:08 +00:00
|
|
|
|
2010-04-30 18:26:32 +00:00
|
|
|
return nsi;
|
2010-04-26 17:18:54 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
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) {
|
2010-05-11 03:54:22 +00:00
|
|
|
LOGP(DNS, LOGL_ERROR, "recv error %s during NSIP recv\n",
|
2010-05-03 16:54:12 +00:00
|
|
|
strerror(errno));
|
2010-04-26 17:18:54 +00:00
|
|
|
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;
|
|
|
|
|
2010-05-12 18:38:45 +00:00
|
|
|
error = gprs_ns_rcvmsg(nsi, msg, &saddr);
|
|
|
|
|
|
|
|
msgb_free(msg);
|
|
|
|
|
|
|
|
return error;
|
2010-04-26 17:18:54 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static int handle_nsip_write(struct bsc_fd *bfd)
|
|
|
|
{
|
|
|
|
/* FIXME: actually send the data here instead of nsip_sendmsg() */
|
|
|
|
return -EIO;
|
|
|
|
}
|
|
|
|
|
2010-04-30 17:54:29 +00:00
|
|
|
int nsip_sendmsg(struct gprs_nsvc *nsvc, struct msgb *msg)
|
2010-04-26 17:18:54 +00:00
|
|
|
{
|
|
|
|
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;
|
|
|
|
}
|
|
|
|
|
2010-05-02 09:26:34 +00:00
|
|
|
extern int make_sock(struct bsc_fd *bfd, int proto, uint16_t port,
|
2010-04-26 17:18:54 +00:00
|
|
|
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;
|
|
|
|
}
|
2010-04-30 18:26:32 +00:00
|
|
|
|
2010-05-14 11:53:08 +00:00
|
|
|
/* Initiate a RESET procedure */
|
|
|
|
int gprs_nsvc_reset(struct gprs_nsvc *nsvc, uint8_t cause)
|
|
|
|
{
|
|
|
|
/* Mark NS-VC locally as blocked and dead */
|
|
|
|
nsvc->state = NSE_S_BLOCKED;
|
|
|
|
/* Send NS-RESET PDU */
|
|
|
|
if (gprs_ns_tx_reset(nsvc, cause) < 0) {
|
|
|
|
LOGP(DNS, LOGL_ERROR, "NSEI=%u, error resetting NS-VC\n",
|
|
|
|
nsvc->nsei);
|
|
|
|
}
|
|
|
|
/* Start Tns-reset */
|
|
|
|
nsvc_start_timer(nsvc, NSVC_TIMER_TNS_RESET);
|
|
|
|
|
|
|
|
return nsvc;
|
|
|
|
}
|
|
|
|
|
2010-04-30 18:26:32 +00:00
|
|
|
/* Establish a connection (from the BSS) to the SGSN */
|
|
|
|
struct gprs_nsvc *nsip_connect(struct gprs_ns_inst *nsi,
|
2010-05-01 09:28:43 +00:00
|
|
|
struct sockaddr_in *dest, uint16_t nsei,
|
|
|
|
uint16_t nsvci)
|
2010-04-30 18:26:32 +00:00
|
|
|
{
|
|
|
|
struct gprs_nsvc *nsvc;
|
|
|
|
|
|
|
|
nsvc = nsvc_by_rem_addr(nsi, dest);
|
2010-05-12 11:56:39 +00:00
|
|
|
if (!nsvc)
|
2010-04-30 18:26:32 +00:00
|
|
|
nsvc = nsvc_create(nsi, nsvci);
|
2010-05-12 11:56:39 +00:00
|
|
|
nsvc->ip.bts_addr = *dest;
|
2010-05-01 09:28:43 +00:00
|
|
|
nsvc->nsei = nsei;
|
|
|
|
nsvc->nsvci = nsvci;
|
2010-04-30 18:26:32 +00:00
|
|
|
nsvc->remote_end_is_sgsn = 1;
|
|
|
|
|
2010-05-14 11:53:08 +00:00
|
|
|
return gprs_nsvc_reset(nsvc, NS_CAUSE_OM_INTERVENTION);
|
2010-04-30 18:26:32 +00:00
|
|
|
}
|