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Add protection for SS7 channel allocation and better glare handling.

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* Added a CLI "ss7 show channels" command that might prove useful for
future debugging.

* Made the incoming SS7 channel event check and gripe message uniform.

* Made sure that the DNID string for an incoming call is always
initialized.

(issue ASTERISK-17966)
Reported by: Kenneth Van Velthoven
Patches:
      jira_asterisk_17966_v1.8_glare.patch (license #5621) patch uploaded by rmudgett
........

Merged revisions 340365 from http://svn.asterisk.org/svn/asterisk/branches/1.8
........

Merged revisions 340366 from http://svn.asterisk.org/svn/asterisk/branches/10


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@340367 65c4cc65-6c06-0410-ace0-fbb531ad65f3
certified/11.2
Richard Mudgett 14 years ago
parent b63c1cc545
commit 9abab10b66
3 changed files with 340 additions and 110 deletions
Show Stats Download Patch File Download Diff File

32
channels/chan_dahdi.c
Unescape View File

@ -16248,9 +16248,11 @@ static char *handle_ss7_debug(struct ast_cli_entry *e, int cmd, struct ast_cli_a
ast_cli(a->fd, "No SS7 running on linkset %d\n", span);
} else {
if (!strcasecmp(a->argv[3], "on")) {
linksets[span - 1].ss7.debug = 1;
ss7_set_debug(linksets[span-1].ss7.ss7, SIG_SS7_DEBUG);
ast_cli(a->fd, "Enabled debugging on linkset %d\n", span);
} else {
linksets[span - 1].ss7.debug = 0;
ss7_set_debug(linksets[span-1].ss7.ss7, 0);
ast_cli(a->fd, "Disabled debugging on linkset %d\n", span);
}
@ -16508,6 +16510,35 @@ static char *handle_ss7_show_linkset(struct ast_cli_entry *e, int cmd, struct as
}
#endif /* defined(HAVE_SS7) */
#if defined(HAVE_SS7)
static char *handle_ss7_show_channels(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
int linkset;
switch (cmd) {
case CLI_INIT:
e->command = "ss7 show channels";
e->usage =
"Usage: ss7 show channels\n"
" Displays SS7 channel information at a glance.\n";
return NULL;
case CLI_GENERATE:
return NULL;
}
if (a->argc != 3)
return CLI_SHOWUSAGE;
sig_ss7_cli_show_channels_header(a->fd);
for (linkset = 0; linkset < NUM_SPANS; ++linkset) {
if (linksets[linkset].ss7.ss7) {
sig_ss7_cli_show_channels(a->fd, &linksets[linkset].ss7);
}
}
return CLI_SUCCESS;
}
#endif /* defined(HAVE_SS7) */
#if defined(HAVE_SS7)
static char *handle_ss7_version(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
@ -16536,6 +16567,7 @@ static struct ast_cli_entry dahdi_ss7_cli[] = {
AST_CLI_DEFINE(handle_ss7_block_linkset, "Blocks all CICs on a linkset"),
AST_CLI_DEFINE(handle_ss7_unblock_linkset, "Unblocks all CICs on a linkset"),
AST_CLI_DEFINE(handle_ss7_show_linkset, "Shows the status of a linkset"),
AST_CLI_DEFINE(handle_ss7_show_channels, "Displays SS7 channel information"),
AST_CLI_DEFINE(handle_ss7_version, "Displays libss7 version"),
};
#endif /* defined(HAVE_SS7) */

382
channels/sig_ss7.c
Unescape View File

@ -37,12 +37,36 @@
#include "asterisk/pbx.h"
#include "asterisk/causes.h"
#include "asterisk/musiconhold.h"
#include "asterisk/cli.h"
#include "asterisk/transcap.h"
#include "sig_ss7.h"
/* ------------------------------------------------------------------- */
static const char *sig_ss7_call_level2str(enum sig_ss7_call_level level)
{
switch (level) {
case SIG_SS7_CALL_LEVEL_IDLE:
return "Idle";
case SIG_SS7_CALL_LEVEL_ALLOCATED:
return "Allocated";
case SIG_SS7_CALL_LEVEL_CONTINUITY:
return "Continuity";
case SIG_SS7_CALL_LEVEL_SETUP:
return "Setup";
case SIG_SS7_CALL_LEVEL_PROCEEDING:
return "Proceeding";
case SIG_SS7_CALL_LEVEL_ALERTING:
return "Alerting";
case SIG_SS7_CALL_LEVEL_CONNECT:
return "Connect";
case SIG_SS7_CALL_LEVEL_GLARE:
return "Glare";
}
return "Unknown";
}
#define SIG_SS7_DEADLOCK_AVOIDANCE(p) \
do { \
sig_ss7_unlock_private(p); \
@ -247,7 +271,7 @@ static void sig_ss7_handle_link_exception(struct sig_ss7_linkset *linkset, int w
* \brief Obtain the sig_ss7 owner channel lock if the owner exists.
* \since 1.8
*
* \param ss7 sig_ss7 SS7 control structure.
* \param ss7 SS7 linkset control structure.
* \param chanpos Channel position in the span.
*
* \note Assumes the ss7->lock is already obtained.
@ -278,7 +302,7 @@ static void sig_ss7_lock_owner(struct sig_ss7_linkset *ss7, int chanpos)
* \brief Queue the given frame onto the owner channel.
* \since 1.8
*
* \param ss7 sig_ss7 SS7 control structure.
* \param ss7 SS7 linkset control structure.
* \param chanpos Channel position in the span.
* \param frame Frame to queue onto the owner channel.
*
@ -301,7 +325,7 @@ static void sig_ss7_queue_frame(struct sig_ss7_linkset *ss7, int chanpos, struct
* \brief Queue a control frame of the specified subclass onto the owner channel.
* \since 1.8
*
* \param ss7 sig_ss7 SS7 control structure.
* \param ss7 SS7 linkset control structure.
* \param chanpos Channel position in the span.
* \param subclass Control frame subclass to queue onto the owner channel.
*
@ -323,6 +347,17 @@ static void sig_ss7_queue_control(struct sig_ss7_linkset *ss7, int chanpos, int
sig_ss7_queue_frame(ss7, chanpos, &f);
}
/*!
* \internal
* \brief Find the channel position by CIC/DPC.
*
* \param linkset SS7 linkset control structure.
* \param cic Circuit Identification Code
* \param dpc Destination Point Code
*
* \retval chanpos on success.
* \retval -1 on error.
*/
static int ss7_find_cic(struct sig_ss7_linkset *linkset, int cic, unsigned int dpc)
{
int i;
@ -336,6 +371,31 @@ static int ss7_find_cic(struct sig_ss7_linkset *linkset, int cic, unsigned int d
return winner;
}
/*!
* \internal
* \brief Find the channel position by CIC/DPC and gripe if not found.
*
* \param linkset SS7 linkset control structure.
* \param cic Circuit Identification Code
* \param dpc Destination Point Code
* \param msg_name Message type name that failed.
*
* \retval chanpos on success.
* \retval -1 on error.
*/
static int ss7_find_cic_gripe(struct sig_ss7_linkset *linkset, int cic, unsigned int dpc, const char *msg_name)
{
int chanpos;
chanpos = ss7_find_cic(linkset, cic, dpc);
if (chanpos < 0) {
ast_log(LOG_WARNING, "Linkset %d: SS7 %s requested unconfigured CIC/DPC %d/%d.\n",
linkset->span, msg_name, cic, dpc);
return -1;
}
return chanpos;
}
static void ss7_handle_cqm(struct sig_ss7_linkset *linkset, int startcic, int endcic, unsigned int dpc)
{
unsigned char status[32];
@ -386,6 +446,7 @@ static inline void ss7_block_cics(struct sig_ss7_linkset *linkset, int startcic,
{
int i;
/* XXX the use of state here seems questionable about matching up with the linkset channels */
for (i = 0; i < linkset->numchans; i++) {
if (linkset->pvts[i] && (linkset->pvts[i]->dpc == dpc && ((linkset->pvts[i]->cic >= startcic) && (linkset->pvts[i]->cic <= endcic)))) {
if (state) {
@ -617,8 +678,6 @@ void *ss7_linkset(void *data)
struct sig_ss7_chan *p;
int chanpos;
struct pollfd pollers[SIG_SS7_NUM_DCHANS];
int cic;
unsigned int dpc;
int nextms = 0;
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
@ -685,6 +744,11 @@ void *ss7_linkset(void *data)
}
while ((e = ss7_check_event(ss7))) {
if (linkset->debug) {
ast_verbose("Linkset %d: Processing event: %s\n",
linkset->span, ss7_event2str(e->e));
}
switch (e->e) {
case SS7_EVENT_UP:
if (linkset->state != LINKSET_STATE_UP) {
@ -710,9 +774,8 @@ void *ss7_linkset(void *data)
ast_log(LOG_WARNING, "MTP2 link down (SLC %d)\n", e->gen.data);
break;
case ISUP_EVENT_CPG:
chanpos = ss7_find_cic(linkset, e->cpg.cic, e->cpg.opc);
chanpos = ss7_find_cic_gripe(linkset, e->cpg.cic, e->cpg.opc, "CPG");
if (chanpos < 0) {
ast_log(LOG_WARNING, "CPG on unconfigured CIC %d\n", e->cpg.cic);
break;
}
p = linkset->pvts[chanpos];
@ -753,17 +816,15 @@ void *ss7_linkset(void *data)
break;
case ISUP_EVENT_RSC:
ast_verbose("Resetting CIC %d\n", e->rsc.cic);
chanpos = ss7_find_cic(linkset, e->rsc.cic, e->rsc.opc);
chanpos = ss7_find_cic_gripe(linkset, e->rsc.cic, e->rsc.opc, "RSC");
if (chanpos < 0) {
ast_log(LOG_WARNING, "RSC on unconfigured CIC %d\n", e->rsc.cic);
break;
}
p = linkset->pvts[chanpos];
sig_ss7_lock_private(p);
sig_ss7_set_inservice(p, 1);
sig_ss7_set_remotelyblocked(p, 0);
dpc = p->dpc;
isup_set_call_dpc(e->rsc.call, dpc);
isup_set_call_dpc(e->rsc.call, p->dpc);
sig_ss7_lock_owner(linkset, chanpos);
p->ss7call = NULL;
if (p->owner) {
@ -775,9 +836,8 @@ void *ss7_linkset(void *data)
break;
case ISUP_EVENT_GRS:
ast_debug(1, "Got Reset for CICs %d to %d: Acknowledging\n", e->grs.startcic, e->grs.endcic);
chanpos = ss7_find_cic(linkset, e->grs.startcic, e->grs.opc);
chanpos = ss7_find_cic_gripe(linkset, e->grs.startcic, e->grs.opc, "GRS");
if (chanpos < 0) {
ast_log(LOG_WARNING, "GRS on unconfigured CIC %d\n", e->grs.startcic);
break;
}
p = linkset->pvts[chanpos];
@ -796,29 +856,53 @@ void *ss7_linkset(void *data)
break;
case ISUP_EVENT_IAM:
ast_debug(1, "Got IAM for CIC %d and called number %s, calling number %s\n", e->iam.cic, e->iam.called_party_num, e->iam.calling_party_num);
chanpos = ss7_find_cic(linkset, e->iam.cic, e->iam.opc);
chanpos = ss7_find_cic_gripe(linkset, e->iam.cic, e->iam.opc, "IAM");
if (chanpos < 0) {
ast_log(LOG_WARNING, "IAM on unconfigured CIC %d\n", e->iam.cic);
isup_rel(ss7, e->iam.call, -1);
break;
}
p = linkset->pvts[chanpos];
sig_ss7_lock_private(p);
if (p->owner) {
if (p->ss7call == e->iam.call) {
sig_ss7_unlock_private(p);
ast_log(LOG_WARNING, "Duplicate IAM requested on CIC %d\n", e->iam.cic);
break;
} else {
sig_ss7_unlock_private(p);
ast_log(LOG_WARNING, "Ring requested on CIC %d already in use!\n", e->iam.cic);
break;
sig_ss7_lock_owner(linkset, chanpos);
if (p->call_level != SIG_SS7_CALL_LEVEL_IDLE) {
/*
* Detected glare/dual-seizure
*
* Always abort both calls since we can't implement the dual
* seizure procedures due to our channel assignment architecture
* and the fact that we cannot tell libss7 to discard its call
* structure to ignore the incoming IAM.
*/
ast_debug(1,
"Linkset %d: SS7 IAM glare on CIC/DPC %d/%d. Dropping both calls.\n",
linkset->span, e->iam.cic, e->iam.opc);
if (p->call_level == SIG_SS7_CALL_LEVEL_ALLOCATED) {
/*
* We have not sent our IAM yet and we never will at this point.
*/
p->alreadyhungup = 1;
isup_rel(ss7, e->iam.call, -1);
}
p->call_level = SIG_SS7_CALL_LEVEL_GLARE;
if (p->owner) {
p->owner->hangupcause = AST_CAUSE_NORMAL_CLEARING;
ast_softhangup_nolock(p->owner, AST_SOFTHANGUP_DEV);
ast_channel_unlock(p->owner);
}
sig_ss7_unlock_private(p);
break;
}
dpc = p->dpc;
/*
* The channel should not have an owner at this point since we
* are in the process of creating an owner for it.
*/
ast_assert(!p->owner);
/* Mark channel as in use so no outgoing call will steal it. */
p->call_level = SIG_SS7_CALL_LEVEL_ALLOCATED;
p->ss7call = e->iam.call;
isup_set_call_dpc(p->ss7call, dpc);
isup_set_call_dpc(p->ss7call, p->dpc);
if ((p->use_callerid) && (!ast_strlen_zero(e->iam.calling_party_num))) {
ss7_apply_plan_to_number(p->cid_num, sizeof(p->cid_num), linkset, e->iam.calling_party_num, e->iam.calling_nai);
@ -830,8 +914,10 @@ void *ss7_linkset(void *data)
if (!ast_strlen_zero(e->iam.called_party_num)) {
ss7_apply_plan_to_number(p->exten, sizeof(p->exten), linkset,
e->iam.called_party_num, e->iam.called_nai);
sig_ss7_set_dnid(p, p->exten);
} else {
p->exten[0] = '\0';
}
sig_ss7_set_dnid(p, p->exten);
if (p->immediate) {
p->exten[0] = 's';
@ -874,9 +960,11 @@ void *ss7_linkset(void *data)
if (ast_exists_extension(NULL, p->context, p->exten, 1, p->cid_num)) {
if (e->iam.cot_check_required) {
p->call_level = SIG_SS7_CALL_LEVEL_CONTINUITY;
sig_ss7_loopback(p, 1);
} else
} else {
ss7_start_call(p, linkset);
}
} else {
ast_debug(1, "Call on CIC for unconfigured extension %s\n", p->exten);
p->alreadyhungup = 1;
@ -885,9 +973,8 @@ void *ss7_linkset(void *data)
sig_ss7_unlock_private(p);
break;
case ISUP_EVENT_COT:
chanpos = ss7_find_cic(linkset, e->cot.cic, e->cot.opc);
chanpos = ss7_find_cic_gripe(linkset, e->cot.cic, e->cot.opc, "COT");
if (chanpos < 0) {
ast_log(LOG_WARNING, "COT on unconfigured CIC %d\n", e->cot.cic);
isup_rel(ss7, e->cot.call, -1);
break;
}
@ -902,9 +989,8 @@ void *ss7_linkset(void *data)
break;
case ISUP_EVENT_CCR:
ast_debug(1, "Got CCR request on CIC %d\n", e->ccr.cic);
chanpos = ss7_find_cic(linkset, e->ccr.cic, e->ccr.opc);
chanpos = ss7_find_cic_gripe(linkset, e->ccr.cic, e->ccr.opc, "CCR");
if (chanpos < 0) {
ast_log(LOG_WARNING, "CCR on unconfigured CIC %d\n", e->ccr.cic);
break;
}
@ -918,9 +1004,8 @@ void *ss7_linkset(void *data)
break;
case ISUP_EVENT_CVT:
ast_debug(1, "Got CVT request on CIC %d\n", e->cvt.cic);
chanpos = ss7_find_cic(linkset, e->cvt.cic, e->cvt.opc);
chanpos = ss7_find_cic_gripe(linkset, e->cvt.cic, e->cvt.opc, "CVT");
if (chanpos < 0) {
ast_log(LOG_WARNING, "CVT on unconfigured CIC %d\n", e->cvt.cic);
break;
}
@ -933,9 +1018,10 @@ void *ss7_linkset(void *data)
isup_cvr(linkset->ss7, e->cvt.cic, p->dpc);
break;
case ISUP_EVENT_REL:
chanpos = ss7_find_cic(linkset, e->rel.cic, e->rel.opc);
chanpos = ss7_find_cic_gripe(linkset, e->rel.cic, e->rel.opc, "REL");
if (chanpos < 0) {
ast_log(LOG_WARNING, "REL on unconfigured CIC %d\n", e->rel.cic);
/* Continue hanging up the call anyway. */
isup_rlc(ss7, e->rel.call);
break;
}
p = linkset->pvts[chanpos];
@ -945,8 +1031,6 @@ void *ss7_linkset(void *data)
p->owner->hangupcause = e->rel.cause;
ast_softhangup_nolock(p->owner, AST_SOFTHANGUP_DEV);
ast_channel_unlock(p->owner);
} else {
ast_log(LOG_WARNING, "REL on channel (CIC %d) without owner!\n", p->cic);
}
/* End the loopback if we have one */
@ -958,12 +1042,12 @@ void *ss7_linkset(void *data)
sig_ss7_unlock_private(p);
break;
case ISUP_EVENT_ACM:
chanpos = ss7_find_cic(linkset, e->acm.cic, e->acm.opc);
chanpos = ss7_find_cic_gripe(linkset, e->acm.cic, e->acm.opc, "ACM");
if (chanpos < 0) {
ast_log(LOG_WARNING, "ACM on unconfigured CIC %d\n", e->acm.cic);
isup_rel(ss7, e->acm.call, -1);
break;
} else {
}
{
p = linkset->pvts[chanpos];
ast_debug(1, "Queueing frame from SS7_EVENT_ACM on CIC %d\n", p->cic);
@ -994,9 +1078,8 @@ void *ss7_linkset(void *data)
}
break;
case ISUP_EVENT_CGB:
chanpos = ss7_find_cic(linkset, e->cgb.startcic, e->cgb.opc);
chanpos = ss7_find_cic_gripe(linkset, e->cgb.startcic, e->cgb.opc, "CGB");
if (chanpos < 0) {
ast_log(LOG_WARNING, "CGB on unconfigured CIC %d\n", e->cgb.startcic);
break;
}
p = linkset->pvts[chanpos];
@ -1004,9 +1087,8 @@ void *ss7_linkset(void *data)
isup_cgba(linkset->ss7, e->cgb.startcic, e->cgb.endcic, e->cgb.opc, e->cgb.status, e->cgb.type);
break;
case ISUP_EVENT_CGU:
chanpos = ss7_find_cic(linkset, e->cgu.startcic, e->cgu.opc);
chanpos = ss7_find_cic_gripe(linkset, e->cgu.startcic, e->cgu.opc, "CGU");
if (chanpos < 0) {
ast_log(LOG_WARNING, "CGU on unconfigured CIC %d\n", e->cgu.startcic);
break;
}
p = linkset->pvts[chanpos];
@ -1014,9 +1096,8 @@ void *ss7_linkset(void *data)
isup_cgua(linkset->ss7, e->cgu.startcic, e->cgu.endcic, e->cgu.opc, e->cgu.status, e->cgu.type);
break;
case ISUP_EVENT_UCIC:
chanpos = ss7_find_cic(linkset, e->ucic.cic, e->ucic.opc);
chanpos = ss7_find_cic_gripe(linkset, e->ucic.cic, e->ucic.opc, "UCIC");
if (chanpos < 0) {
ast_log(LOG_WARNING, "UCIC on unconfigured CIC %d\n", e->ucic.cic);
break;
}
p = linkset->pvts[chanpos];
@ -1027,9 +1108,8 @@ void *ss7_linkset(void *data)
sig_ss7_unlock_private(p);/* doesn't require a SS7 acknowledgement */
break;
case ISUP_EVENT_BLO:
chanpos = ss7_find_cic(linkset, e->blo.cic, e->blo.opc);
chanpos = ss7_find_cic_gripe(linkset, e->blo.cic, e->blo.opc, "BLO");
if (chanpos < 0) {
ast_log(LOG_WARNING, "BLO on unconfigured CIC %d\n", e->blo.cic);
break;
}
p = linkset->pvts[chanpos];
@ -1040,9 +1120,8 @@ void *ss7_linkset(void *data)
isup_bla(linkset->ss7, e->blo.cic, p->dpc);
break;
case ISUP_EVENT_BLA:
chanpos = ss7_find_cic(linkset, e->bla.cic, e->bla.opc);
chanpos = ss7_find_cic_gripe(linkset, e->bla.cic, e->bla.opc, "BLA");
if (chanpos < 0) {
ast_log(LOG_WARNING, "BLA on unconfigured CIC %d\n", e->bla.cic);
break;
}
ast_debug(1, "Blocking CIC %d\n", e->bla.cic);
@ -1052,9 +1131,8 @@ void *ss7_linkset(void *data)
sig_ss7_unlock_private(p);
break;
case ISUP_EVENT_UBL:
chanpos = ss7_find_cic(linkset, e->ubl.cic, e->ubl.opc);
chanpos = ss7_find_cic_gripe(linkset, e->ubl.cic, e->ubl.opc, "UBL");
if (chanpos < 0) {
ast_log(LOG_WARNING, "UBL on unconfigured CIC %d\n", e->ubl.cic);
break;
}
p = linkset->pvts[chanpos];
@ -1065,9 +1143,8 @@ void *ss7_linkset(void *data)
isup_uba(linkset->ss7, e->ubl.cic, p->dpc);
break;
case ISUP_EVENT_UBA:
chanpos = ss7_find_cic(linkset, e->uba.cic, e->uba.opc);
chanpos = ss7_find_cic_gripe(linkset, e->uba.cic, e->uba.opc, "UBA");
if (chanpos < 0) {
ast_log(LOG_WARNING, "UBA on unconfigured CIC %d\n", e->uba.cic);
break;
}
p = linkset->pvts[chanpos];
@ -1078,17 +1155,21 @@ void *ss7_linkset(void *data)
break;
case ISUP_EVENT_CON:
case ISUP_EVENT_ANM:
if (e->e == ISUP_EVENT_CON)
cic = e->con.cic;
else
cic = e->anm.cic;
chanpos = ss7_find_cic(linkset, cic, (e->e == ISUP_EVENT_ANM) ? e->anm.opc : e->con.opc);
if (chanpos < 0) {
ast_log(LOG_WARNING, "ANM/CON on unconfigured CIC %d\n", cic);
isup_rel(ss7, (e->e == ISUP_EVENT_ANM) ? e->anm.call : e->con.call, -1);
break;
if (e->e == ISUP_EVENT_CON) {
chanpos = ss7_find_cic_gripe(linkset, e->con.cic, e->con.opc, "CON");
if (chanpos < 0) {
isup_rel(ss7, e->con.call, -1);
break;
}
} else {
chanpos = ss7_find_cic_gripe(linkset, e->anm.cic, e->anm.opc, "ANM");
if (chanpos < 0) {
isup_rel(ss7, e->anm.call, -1);
break;
}
}
{
p = linkset->pvts[chanpos];
sig_ss7_lock_private(p);
if (p->call_level < SIG_SS7_CALL_LEVEL_CONNECT) {
@ -1106,30 +1187,43 @@ void *ss7_linkset(void *data)
}
break;
case ISUP_EVENT_RLC:
chanpos = ss7_find_cic(linkset, e->rlc.cic, e->rlc.opc);
/* XXX Call ptr should be passed up from libss7! */
chanpos = ss7_find_cic_gripe(linkset, e->rlc.cic, e->rlc.opc, "RLC");
if (chanpos < 0) {
ast_log(LOG_WARNING, "RLC on unconfigured CIC %d\n", e->rlc.cic);
break;
} else {
}
{
p = linkset->pvts[chanpos];
sig_ss7_lock_private(p);
if (p->alreadyhungup)
if (p->alreadyhungup) {
if (!p->owner) {
p->call_level = SIG_SS7_CALL_LEVEL_IDLE;
}
p->ss7call = NULL;
else
ast_log(LOG_NOTICE, "Received RLC out and we haven't sent REL. Ignoring.\n");
}
sig_ss7_unlock_private(p);
}
break;
case ISUP_EVENT_FAA:
chanpos = ss7_find_cic(linkset, e->faa.cic, e->faa.opc);
/*!
* \todo The handling of the SS7 FAA message is not good and I
* don't know enough to handle it correctly.
*/
chanpos = ss7_find_cic_gripe(linkset, e->faa.cic, e->faa.opc, "FAA");
if (chanpos < 0) {
ast_log(LOG_WARNING, "FAA on unconfigured CIC %d\n", e->faa.cic);
isup_rel(linkset->ss7, e->faa.call, -1);
break;
} else {
}
{
/* XXX FAR and FAA used for something dealing with transfers? */
p = linkset->pvts[chanpos];
ast_debug(1, "FAA received on CIC %d\n", e->faa.cic);
sig_ss7_lock_private(p);
if (p->alreadyhungup){
if (!p->owner) {
p->call_level = SIG_SS7_CALL_LEVEL_IDLE;
}
/* XXX We seem to be leaking the isup call structure here. */
p->ss7call = NULL;
ast_log(LOG_NOTICE, "Received FAA and we haven't sent FAR. Ignoring.\n");
}
@ -1246,6 +1340,24 @@ int sig_ss7_add_sigchan(struct sig_ss7_linkset *linkset, int which, int ss7type,
return 0;
}
/*!
* \internal
* \brief Determine if a private channel structure is available.
*
* \param pvt Channel to determine if available.
*
* \return TRUE if the channel is available.
*/
static int sig_ss7_is_chan_available(struct sig_ss7_chan *pvt)
{
if (!pvt->inalarm && !pvt->owner && !pvt->ss7call
&& pvt->call_level == SIG_SS7_CALL_LEVEL_IDLE
&& !pvt->locallyblocked && !pvt->remotelyblocked) {
return 1;
}
return 0;
}
/*!
* \brief Determine if the specified channel is available for an outgoing call.
* \since 1.8
@ -1256,17 +1368,22 @@ int sig_ss7_add_sigchan(struct sig_ss7_linkset *linkset, int which, int ss7type,
*/
int sig_ss7_available(struct sig_ss7_chan *p)
{
int available;
if (!p->ss7) {
/* Something is wrong here. A SS7 channel without the ss7 pointer? */
return 0;
}
if (!p->inalarm && !p->owner && !p->ss7call
&& !p->locallyblocked && !p->remotelyblocked) {
return 1;
/* Only have to deal with the linkset lock. */
ast_mutex_lock(&p->ss7->lock);
available = sig_ss7_is_chan_available(p);
if (available) {
p->call_level = SIG_SS7_CALL_LEVEL_ALLOCATED;
}
ast_mutex_unlock(&p->ss7->lock);
return 0;
return available;
}
static unsigned char cid_pres2ss7pres(int cid_pres)
@ -1333,6 +1450,12 @@ int sig_ss7_call(struct sig_ss7_chan *p, struct ast_channel *ast, char *rdest)
ss7_grab(p, p->ss7);
if (p->call_level != SIG_SS7_CALL_LEVEL_ALLOCATED) {
/* Call collision before sending IAM. Abort call. */
ss7_rel(p->ss7);
return -1;
}
p->ss7call = isup_new_call(p->ss7->ss7);
if (!p->ss7call) {
ss7_rel(p->ss7);
@ -1447,14 +1570,14 @@ int sig_ss7_hangup(struct sig_ss7_chan *p, struct ast_channel *ast)
p->owner = NULL;
sig_ss7_set_dialing(p, 0);
p->call_level = SIG_SS7_CALL_LEVEL_IDLE;
p->outgoing = 0;
p->progress = 0;
p->rlt = 0;
p->exten[0] = '\0';
/* Perform low level hangup if no owner left */
ss7_grab(p, p->ss7);
p->call_level = SIG_SS7_CALL_LEVEL_IDLE;
if (p->ss7call) {
ss7_grab(p, p->ss7);
if (!p->alreadyhungup) {
const char *cause = pbx_builtin_getvar_helper(ast,"SS7_CAUSE");
int icause = ast->hangupcause ? ast->hangupcause : -1;
@ -1466,11 +1589,9 @@ int sig_ss7_hangup(struct sig_ss7_chan *p, struct ast_channel *ast)
}
isup_rel(p->ss7->ss7, p->ss7call, icause);
p->alreadyhungup = 1;
} else {
ast_log(LOG_WARNING, "Trying to hangup twice!\n");
}
ss7_rel(p->ss7);
}
ss7_rel(p->ss7);
return res;
}
@ -1537,17 +1658,19 @@ int sig_ss7_indicate(struct sig_ss7_chan *p, struct ast_channel *chan, int condi
res = sig_ss7_play_tone(p, SIG_SS7_TONE_BUSY);
break;
case AST_CONTROL_RINGING:
ss7_grab(p, p->ss7);
if (p->call_level < SIG_SS7_CALL_LEVEL_ALERTING && !p->outgoing) {
p->call_level = SIG_SS7_CALL_LEVEL_ALERTING;
if (p->ss7 && p->ss7->ss7) {
ss7_grab(p, p->ss7);
if ((isup_far(p->ss7->ss7, p->ss7call)) != -1)
p->rlt = 1;
if (p->rlt != 1) /* No need to send CPG if call will be RELEASE */
isup_cpg(p->ss7->ss7, p->ss7call, CPG_EVENT_ALERTING);
ss7_rel(p->ss7);
if ((isup_far(p->ss7->ss7, p->ss7call)) != -1) {
p->rlt = 1;
}
/* No need to send CPG if call will be RELEASE */
if (p->rlt != 1) {
isup_cpg(p->ss7->ss7, p->ss7call, CPG_EVENT_ALERTING);
}
}
ss7_rel(p->ss7);
res = sig_ss7_play_tone(p, SIG_SS7_TONE_RINGTONE);
@ -1557,37 +1680,34 @@ int sig_ss7_indicate(struct sig_ss7_chan *p, struct ast_channel *chan, int condi
break;
case AST_CONTROL_PROCEEDING:
ast_debug(1,"Received AST_CONTROL_PROCEEDING on %s\n",chan->name);
ss7_grab(p, p->ss7);
/* This IF sends the FAR for an answered ALEG call */
if (chan->_state == AST_STATE_UP && (p->rlt != 1)){
ss7_grab(p, p->ss7);
if ((isup_far(p->ss7->ss7, p->ss7call)) != -1) {
p->rlt = 1;
}
ss7_rel(p->ss7);
}
if (p->call_level < SIG_SS7_CALL_LEVEL_PROCEEDING && !p->outgoing) {
p->call_level = SIG_SS7_CALL_LEVEL_PROCEEDING;
if (p->ss7 && p->ss7->ss7) {
ss7_grab(p, p->ss7);
isup_acm(p->ss7->ss7, p->ss7call);
ss7_rel(p->ss7);
}
isup_acm(p->ss7->ss7, p->ss7call);
}
ss7_rel(p->ss7);
/* don't continue in ast_indicate */
res = 0;
break;
case AST_CONTROL_PROGRESS:
ast_debug(1,"Received AST_CONTROL_PROGRESS on %s\n",chan->name);
ss7_grab(p, p->ss7);
if (!p->progress && p->call_level < SIG_SS7_CALL_LEVEL_ALERTING && !p->outgoing) {
p->progress = 1;/* No need to send inband-information progress again. */
if (p->ss7 && p->ss7->ss7) {
ss7_grab(p, p->ss7);
isup_cpg(p->ss7->ss7, p->ss7call, CPG_EVENT_INBANDINFO);
ss7_rel(p->ss7);
/* enable echo canceler here on SS7 calls */
sig_ss7_set_echocanceller(p, 1);
}
isup_cpg(p->ss7->ss7, p->ss7call, CPG_EVENT_INBANDINFO);
ss7_rel(p->ss7);
/* enable echo canceler here on SS7 calls */
sig_ss7_set_echocanceller(p, 1);
} else {
ss7_rel(p->ss7);
}
/* don't continue in ast_indicate */
res = 0;
@ -1639,6 +1759,11 @@ struct ast_channel *sig_ss7_request(struct sig_ss7_chan *p, enum sig_ss7_law law
ast = sig_ss7_new_ast_channel(p, AST_STATE_RESERVED, law, transfercapability, p->exten, requestor);
if (!ast) {
p->outgoing = 0;
/* Release the allocated channel. Only have to deal with the linkset lock. */
ast_mutex_lock(&p->ss7->lock);
p->call_level = SIG_SS7_CALL_LEVEL_IDLE;
ast_mutex_unlock(&p->ss7->lock);
}
return ast;
}
@ -1656,6 +1781,51 @@ void sig_ss7_chan_delete(struct sig_ss7_chan *doomed)
ast_free(doomed);
}
#define SIG_SS7_SC_HEADER "%-4s %4s %-4s %-3s %-3s %-10s %-4s %s\n"
#define SIG_SS7_SC_LINE "%4d %4d %-4s %-3s %-3s %-10s %-4s %s"
void sig_ss7_cli_show_channels_header(int fd)
{
ast_cli(fd, SIG_SS7_SC_HEADER, "link", "", "Chan", "Lcl", "Rem", "Call", "SS7", "Channel");
ast_cli(fd, SIG_SS7_SC_HEADER, "set", "Chan", "Idle", "Blk", "Blk", "Level", "Call", "Name");
}
void sig_ss7_cli_show_channels(int fd, struct sig_ss7_linkset *linkset)
{
char line[256];
int idx;
struct sig_ss7_chan *pvt;
ast_mutex_lock(&linkset->lock);
for (idx = 0; idx < linkset->numchans; ++idx) {
if (!linkset->pvts[idx]) {
continue;
}
pvt = linkset->pvts[idx];
sig_ss7_lock_private(pvt);
sig_ss7_lock_owner(linkset, idx);
snprintf(line, sizeof(line), SIG_SS7_SC_LINE,
linkset->span,
pvt->channel,
sig_ss7_is_chan_available(pvt) ? "Yes" : "No",
pvt->locallyblocked ? "Yes" : "No",
pvt->remotelyblocked ? "Yes" : "No",
sig_ss7_call_level2str(pvt->call_level),
pvt->ss7call ? "Yes" : "No",
pvt->owner ? pvt->owner->name : "");
if (pvt->owner) {
ast_channel_unlock(pvt->owner);
}
sig_ss7_unlock_private(pvt);
ast_mutex_unlock(&linkset->lock);
ast_cli(fd, "%s\n", line);
ast_mutex_lock(&linkset->lock);
}
ast_mutex_unlock(&linkset->lock);
}
/*!
* \brief Create a new sig_ss7 private channel structure.
* \since 1.8
@ -1687,7 +1857,7 @@ struct sig_ss7_chan *sig_ss7_chan_new(void *pvt_data, struct sig_ss7_callback *c
* \brief Initialize the SS7 linkset control.
* \since 1.8
*
* \param ss7 sig_ss7 SS7 control structure.
* \param ss7 SS7 linkset control structure.
*
* \return Nothing
*/

36
channels/sig_ss7.h
Unescape View File

@ -88,14 +88,38 @@ enum sig_ss7_law {
enum sig_ss7_call_level {
/*! Call does not exist. */
SIG_SS7_CALL_LEVEL_IDLE,
/*! Call is present but has no response yet. (SETUP) */
/*!
* Call is allocated to the channel.
* We have not sent or responded to IAM yet.
*/
SIG_SS7_CALL_LEVEL_ALLOCATED,
/*!
* Call is performing continuity check after receiving IAM.
* We are waiting for COT to proceed further.
*/
SIG_SS7_CALL_LEVEL_CONTINUITY,
/*!
* Call is present.
* We have not seen a response or sent further call progress to an IAM yet.
*/
SIG_SS7_CALL_LEVEL_SETUP,
/*! Call routing is happening. (PROCEEDING) */
/*!
* Call routing is happening.
* We have sent or received ACM.
*/
SIG_SS7_CALL_LEVEL_PROCEEDING,
/*! Called party is being alerted of the call. (ALERTING) */
/*!
* Called party is being alerted of the call.
* We have sent or received CPG(ALERTING)/ACM(ALERTING).
*/
SIG_SS7_CALL_LEVEL_ALERTING,
/*! Call is connected/answered. (CONNECT) */
/*!
* Call is connected/answered.
* We have sent or received CON/ANM.
*/
SIG_SS7_CALL_LEVEL_CONNECT,
/*! Call has collided with incoming call. */
SIG_SS7_CALL_LEVEL_GLARE,
};
struct sig_ss7_linkset;
@ -232,6 +256,7 @@ struct sig_ss7_linkset {
int linkstate[SIG_SS7_NUM_DCHANS];
int numchans;
int span; /*!< span number put into user output messages */
int debug; /*!< set to true if to dump SS7 event info */
enum {
LINKSET_STATE_DOWN = 0,
LINKSET_STATE_UP
@ -267,6 +292,9 @@ void sig_ss7_chan_delete(struct sig_ss7_chan *doomed);
struct sig_ss7_chan *sig_ss7_chan_new(void *pvt_data, struct sig_ss7_callback *callback, struct sig_ss7_linkset *ss7);
void sig_ss7_init_linkset(struct sig_ss7_linkset *ss7);
void sig_ss7_cli_show_channels_header(int fd);
void sig_ss7_cli_show_channels(int fd, struct sig_ss7_linkset *linkset);
/* ------------------------------------------------------------------- */

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