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mtp3.c
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/*
* libss7: An implementation of Signalling System 7
*
* Written by Matthew Fredrickson <[email protected]>
*
* scheduling routines taken from libpri by Mark Spencer <[email protected]>
*
* Copyright (C) 2006-2008, Digium, Inc
* All Rights Reserved.
*/
/*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2 as published by the
* Free Software Foundation. See the LICENSE file included with
* this program for more details.
*
* In addition, when this program is distributed with Asterisk in
* any form that would qualify as a 'combined work' or as a
* 'derivative work' (but not mere aggregation), you can redistribute
* and/or modify the combination under the terms of the license
* provided with that copy of Asterisk, instead of the license
* terms granted here.
*/
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "libss7.h"
#include "ss7_internal.h"
#include "mtp2.h"
#include "mtp3.h"
#include "isup.h"
char testmessage[] = "2564286288";
#define mtp3_size(ss7) (((ss7)->switchtype == SS7_ITU) ? 5 : 8)
/* Routing label size */
#define rl_size(ss7) (((ss7)->switchtype == SS7_ITU) ? 4 : 7)
static struct mtp2 * slc_to_mtp2(struct ss7 *ss7, unsigned int slc);
static char * userpart2str(unsigned char userpart)
{
switch (userpart) {
case SIG_NET_MNG:
return "NET_MNG";
case SIG_STD_TEST:
return "STD_TEST";
case SIG_SPEC_TEST:
return "SPEC_TEST";
case SIG_SCCP:
return "SCCP";
case SIG_ISUP:
return "ISUP";
default:
return "Unknown";
}
}
static char * ss7_ni2str(unsigned char ni)
{
switch (ni) {
case SS7_NI_INT:
return "international";
case SS7_NI_INT_SPARE:
return "international_spare";
case SS7_NI_NAT:
return "national";
case SS7_NI_NAT_SPARE:
return "national_spare";
default:
return "Unknown";
}
}
static int get_routinglabel(unsigned int switchtype, unsigned char *sif, struct routing_label *rl)
{
unsigned char *buf = sif;
rl->type = switchtype;
if (switchtype == SS7_ANSI) {
rl->dpc = buf[0] | (buf[1] << 8) | (buf[2] << 16);
rl->opc = buf[3] | (buf[4] << 8) | (buf[5] << 16);
rl->sls = buf[6];
return 7;
} else { /* ITU style */
/* more complicated. Stupid ITU with their programmer unfriendly point codes. */
rl->dpc = (buf[0] | (buf[1] << 8)) & 0x3fff; /* 14 bits long */
rl->opc = ((buf[1] >> 6) | (buf[2] << 2) | (buf[3] << 10)) & 0x3fff;
rl->sls = buf[3] >> 4;
return 4;
}
}
unsigned char ansi_sls_next(struct ss7 *ss7)
{
unsigned char res = ss7->sls;
ss7->sls = (ss7->sls + 1) % 256;
return res;
}
static unsigned char get_userpart(unsigned char sio)
{
return sio & 0xf;
}
static inline unsigned char get_ni(unsigned char sio)
{
return (sio >> 6) & 0x3;
}
static inline unsigned char get_priority(unsigned char sio)
{
return (sio >> 4) & 0x3;
}
int set_routinglabel(unsigned char *sif, struct routing_label *rl)
{
unsigned char *buf = sif;
switch (rl->type) {
case SS7_ANSI: /* Cake */
buf[0] = rl->dpc & 0xff;
buf[1] = (rl->dpc >> 8) & 0xff;
buf[2] = (rl->dpc >> 16) & 0xff;
buf[3] = rl->opc & 0xff;
buf[4] = (rl->opc >> 8) & 0xff;
buf[5] = (rl->opc >> 16) & 0xff;
buf[6] = rl->sls & 0xff;
return 7;
case SS7_ITU:
/* Stupid ITU point codes. This would be a lot easier
if compilers could come up with a standard for doing bit
field packing within data structures. But alas, they all
have their differences. So bit shifting it is. */
buf[0] = rl->dpc & 0xff;
buf[1] = ((rl->dpc >> 8) & 0x3f) | ((rl->opc << 6) & 0xc0);
buf[2] = (rl->opc >> 2) & 0xff;
buf[3] = ((rl->opc >> 10) & 0x0f) | ((rl->sls << 4) & 0xf0);
return 4;
default:
return -1;
}
}
/* Hopefully it'll be the bottom 4 bits */
static inline void set_h0(unsigned char *h0, unsigned char val)
{
(*h0) |= (val & 0xf);
}
static inline unsigned char get_h0(unsigned char *byte)
{
return (*byte) & 0xf;
}
static inline void set_h1(unsigned char *h1, unsigned char val)
{
(*h1) |= ((val << 4) & 0xf0);
}
static inline unsigned char get_h1(unsigned char *byte)
{
return (((*byte) & 0xf0) >> 4);
}
static inline int link_available(struct ss7 *ss7, int linkid, struct ss7_msg ***buffer, struct routing_label rl)
{
if ((ss7->mtp2_linkstate[linkid] == MTP2_LINKSTATE_UP &&
ss7->links[linkid]->adj_sp->state == MTP3_UP &&
ss7->links[linkid]->changeover != CHANGEOVER_COMPLETED) ||
(ss7->links[linkid]->changeover == CHANGEOVER_IN_PROGRESS) ||
ss7->links[linkid]->changeover == CHANGEBACK_INITIATED) {
struct mtp3_route *route = ss7->links[linkid]->adj_sp->routes;
while (route) {
if (route->dpc == rl.dpc) {
if (route->t6 > -1) {
/* T6 is running, buffering */
*buffer = &route->q;
return 1;
}
if (route->state == TFR_NON_ACTIVE || route->state == TFA) {
break;
} else {
*buffer = NULL;
return 0;
}
}
route = route->next;
}
switch (ss7->links[linkid]->changeover) {
case CHANGEOVER_IN_PROGRESS:
case CHANGEOVER_INITIATED:
*buffer = &ss7->links[linkid]->co_buf;
return 1;
case CHANGEBACK_INITIATED:
case CHANGEBACK:
*buffer = &ss7->links[linkid]->cb_buf;
return 1;
default:
*buffer = NULL;
return 1;
}
} else {
*buffer = NULL;
return 0;
}
}
static inline struct mtp2 * rl_to_link(struct ss7 *ss7, struct routing_label rl, struct ss7_msg ***buffer)
{
int linkid;
linkid = (rl.sls >> ss7->sls_shift) % ss7->numlinks;
if (link_available(ss7, linkid, buffer, rl)) {
return ss7->links[linkid];
} else {
struct mtp2 *winner = NULL;
int i;
for (i = 0; i < ss7->numlinks; i++) {
if (link_available(ss7, i, buffer, rl)) {
winner = ss7->links[i];
break;
}
}
return winner;
}
}
struct net_mng_message net_mng_messages[] = {
{ 1, 1, "COO"},
{ 1, 2, "COA"},
{ 1, 5, "CBD"},
{ 1, 6, "CBA"},
{ 2, 1, "ECO"},
{ 2, 2, "ECA"},
{ 3, 1, "RCT"},
{ 3, 2, "TFC"},
{ 4, 1, "TFP"},
{ 4, 2, "TCP"},
{ 4, 3, "TFR"},
{ 4, 4, "TCR"},
{ 4, 5, "TFA"},
{ 4, 6, "TCA"},
{ 5, 1, "RST/RSP"},
{ 5, 2, "RSR"},
{ 5, 3, "RCP"},
{ 5, 4, "RCR"},
{ 6, 1, "LIN"},
{ 6, 2, "LUN"},
{ 6, 3, "LIA"},
{ 6, 4, "LUA"},
{ 6, 5, "LID"},
{ 6, 6, "LFU"},
{ 6, 7, "LLT/LLI"},
{ 6, 8, "LRT/LRI"},
{ 7, 1, "TRA"},
{ 7, 2, "TRW"},
{ 8, 1, "DLC"},
{ 8, 2, "CSS"},
{ 8, 3, "CNS"},
{ 8, 4, "CNP"},
{ 0xa, 1, "UPU"},
};
static void mtp3_setstate_mtp2link(struct ss7 *ss7, struct mtp2 *link, int newstate)
{
int i;
for (i = 0; i < ss7->numlinks; i++) {
if (ss7->links[i] == link) {
ss7->mtp2_linkstate[i] = newstate;
}
}
}
static char * net_mng_message2str(int h0, int h1)
{
int i;
for (i = 0; i < (sizeof(net_mng_messages) / sizeof(struct net_mng_message)); i++) {
if ((net_mng_messages[i].h0 == h0) && (net_mng_messages[i].h1 == h1)) {
return net_mng_messages[i].name;
}
}
return "Unknown";
}
static int net_mng_dump(struct ss7 *ss7, struct mtp2 *mtp2, unsigned char userpart, unsigned char *buf, int len)
{
unsigned char *headerptr = buf + rl_size(ss7);
unsigned char h1, h0;
h1 = h0 = *headerptr;
h1 = get_h1(headerptr);
h0 = get_h0(headerptr);
ss7_message(ss7, "\tH0: %x H1: %x\n", h0, h1);
if (userpart == SIG_NET_MNG) {
ss7_message(ss7, "\tMessage type: %s\n", net_mng_message2str(h0, h1));
}
ss7_dump_buf(ss7, 1, headerptr, len - rl_size(ss7));
return 0;
}
static void q707_t1_expiry(void *data);
static void std_test_send(struct mtp2 *link)
{
struct ss7_msg *m;
unsigned char *layer4;
struct routing_label rl;
struct ss7 *ss7 = link->master;
int rllen = 0;
unsigned char testlen = strlen(testmessage);
m = ss7_msg_new();
if (!m) {
ss7_error(link->master, "Malloc failed on ss7_msg!. Unable to transmit STD_TEST\n");
return;
}
layer4 = ss7_msg_userpart(m);
rl.type = ss7->switchtype;
rl.opc = ss7->pc;
rl.dpc = link->dpc;
rl.sls = link->net_mng_sls;
rllen = set_routinglabel(layer4, &rl);
layer4 += rllen;
set_h0(layer4, 1);
set_h1(layer4, 1);
if (ss7->switchtype == SS7_ANSI) {
layer4[1] = (testlen << 4) | (link->slc & 0xf);
} else {
layer4[1] = (testlen << 4);
}
memcpy(&layer4[2], testmessage, testlen);
ss7_msg_userpart_len(m, rllen + testlen + 2);
if (mtp3_transmit(link->master, (ss7->switchtype == SS7_ITU) ? SIG_STD_TEST : SIG_SPEC_TEST, rl, 3, m, link) > -1 &&
link->master->mtp3_timers[MTP3_TIMER_Q707_T1] > 0) {
if (link->mtp3_timer[MTP3_TIMER_Q707_T1] > -1) {
ss7_schedule_del(ss7, &link->mtp3_timer[MTP3_TIMER_Q707_T1]);
}
link->mtp3_timer[MTP3_TIMER_Q707_T1] = ss7_schedule_event(ss7, link->master->mtp3_timers[MTP3_TIMER_Q707_T1], q707_t1_expiry, link);
}
}
static void mtp3_event_link_down(struct mtp2 *link);
static void q707_t1_expiry(void *data)
{
struct mtp2 *link = data;
link->q707_t1_failed++;
link->mtp3_timer[MTP3_TIMER_Q707_T1] = -1;
if (link->q707_t1_failed > 1) {
ss7_error(link->master, "Q707 T1 timer expired 2nd time on link SLC: %i PC: %i\n", link->slc, link->dpc);
link->q707_t1_failed = 0;
if (link->mtp3_timer[MTP3_TIMER_Q707_T2] > -1) {
ss7_schedule_del(link->master, &link->mtp3_timer[MTP3_TIMER_Q707_T2]);
}
mtp3_event_link_down(link);
}
std_test_send(link);
}
static inline void ss7_linkset_up_event(struct ss7 *ss7)
{
ss7_event *e = ss7_next_empty_event(ss7);
if (!e) {
return;
}
e->e = SS7_STATE_UP;
}
static void linkset_up_expired(void *data)
{
struct ss7 *ss7 = data;
ss7->linkset_up_timer = -1;
ss7_linkset_up_event(ss7);
}
static int available_links(struct ss7 *ss7, int dpc, int ignore_inhibit)
{
int res = 0, i;
struct mtp3_route *route;
for (i = 0; i < ss7->numlinks; i++) {
if (ss7->links[i]->std_test_passed &&
((ignore_inhibit && ss7->links[i]->inhibit) ? 1 :
(ss7->links[i]->changeover == NO_CHANGEOVER || ss7->links[i]->changeover == CHANGEBACK))) {
if (dpc == -1) {
res++;
} else {
route = ss7->links[i]->adj_sp->routes;
while (route) {
if (route->dpc == dpc ) {
if (route->state == TFA || route->state == TFR_NON_ACTIVE) {
res++;
}
break;
}
route = route->next;
}
}
}
}
return res;
}
static int ss7_check(struct ss7 *ss7)
{
int i, j, mtp3_up = 0;
int av_links = available_links(ss7, -1, 0);
for (i = 0; i < ss7->numsps; i++) {
if (ss7->adj_sps[i]->state == MTP3_UP) {
mtp3_up = 1;
break;
}
}
if (!av_links && mtp3_up) {
/* find a locally inhibited link */
for (i = 0; i < ss7->numlinks; i++) {
if (ss7->links[i]->inhibit & INHIBITED_LOCALLY) {
if (!(ss7->links[i]->got_sent_netmsg & SENT_LUN)) {
AUTORL(rl, ss7->links[i]);
net_mng_send(ss7->links[i], NET_MNG_LUN, rl, 0);
ss7_message(ss7, "Uninhibiting locally inhibited link (no more signalling links are in service) SLC: %i ADJPC: %i\n", ss7->links[i]->slc, ss7->links[i]->dpc);
}
if (ss7->links[i]->inhibit & INHIBITED_REMOTELY) {
i = ss7->numlinks; /* in this case force remote uninhibit too ! */
}
break;
}
}
/* try force uninhibit */
if (i == ss7->numlinks) {
for (i = 0; i < ss7->numlinks; i++) {
if (ss7->links[i]->inhibit & INHIBITED_REMOTELY) {
if (!(ss7->links[i]->got_sent_netmsg & SENT_LFU)) {
AUTORL(rl, ss7->links[i]);
net_mng_send(ss7->links[i], NET_MNG_LFU, rl, 0);
ss7_message(ss7, "Forced uninhibiting remotely inhibited link (no more signalling links are in service) SLC: %i ADJPC: %i\n", ss7->links[i]->slc, ss7->links[i]->dpc);
}
break;
}
}
}
}
if (ss7->state != SS7_STATE_UP && mtp3_up) {
ss7->state = SS7_STATE_UP;
if (LINKSET_UP_DELAY > -1) {
if (ss7->linkset_up_timer > -1) {
ss7_schedule_del(ss7, &ss7->linkset_up_timer);
}
ss7->linkset_up_timer = ss7_schedule_event(ss7, LINKSET_UP_DELAY, &linkset_up_expired, ss7);
ss7_message(ss7, "LINKSET UP DELAYING RESETTING\n");
} else {
ss7_linkset_up_event(ss7);
}
/* Set links to changeover state which are not came up yet */
for (i = 0; i < ss7->numlinks; i++) {
if (!ss7->links[i]->std_test_passed) {
ss7->links[i]->changeover = CHANGEOVER_COMPLETED;
}
}
}
if (ss7->state != SS7_STATE_DOWN && !mtp3_up) {
ss7->state = SS7_STATE_DOWN;
if (ss7->linkset_up_timer == -1) {
struct mtp2 *link;
ss7_event *e = ss7_next_empty_event(ss7);
if (!e) {
return -1;
}
e->e = SS7_EVENT_DOWN;
isup_free_all_calls(ss7);
for (i = 0; i < ss7->numlinks; i++) {
link = ss7->links[i];
if (link->inhibit & INHIBITED_LOCALLY) {
link->changeover = CHANGEOVER_COMPLETED; /* because will be stopped all of the timers and flushed the buffers */
} else {
link->changeover = NO_CHANGEOVER;
}
mtp3_free_co(link);
for (j = 0; j < MTP3_MAX_TIMERS; j++) {
if (link->mtp3_timer[j] > -1) {
ss7_schedule_del(ss7, &link->mtp3_timer[j]);
}
}
}
} else {
ss7_schedule_del(ss7, &ss7->linkset_up_timer);
}
}
return 0;
}
static void mtp3_stop_all_timers_except_cocb(struct mtp2 *link)
{
int x;
for (x = 0; x < MTP3_MAX_TIMERS; x++) {
if (link->mtp3_timer[x] > -1 && x != MTP3_TIMER_T1 && x != MTP3_TIMER_T3 &&
x != MTP3_TIMER_T2 && x != MTP3_TIMER_T4 && x != MTP3_TIMER_T5 &&
x != MTP3_TIMER_T22 && x != MTP3_TIMER_T23) {
ss7_schedule_del(link->master, &link->mtp3_timer[x]);
ss7_debug_msg(link->master, SS7_DEBUG_MTP3, "Stopped MTP3 timer %s on link SLC: %i PC: %i\n", mtp3_timer2str(x), link->slc, link->dpc);
}
}
}
static void mtp3_timer_q707_t2_expiry(void *data)
{
struct mtp2 *link = data;
std_test_send(link);
link->mtp3_timer[MTP3_TIMER_Q707_T2] = ss7_schedule_event(link->master, link->master->mtp3_timers[MTP3_TIMER_Q707_T2], mtp3_timer_q707_t2_expiry, link);
}
static void mtp3_event_link_up(struct mtp2 * link)
{
std_test_send(link);
if (link->master->mtp3_timers[MTP3_TIMER_Q707_T2] > 0) {
if (link->mtp3_timer[MTP3_TIMER_Q707_T2] > -1) {
ss7_schedule_del(link->master, &link->mtp3_timer[MTP3_TIMER_Q707_T2]);
}
link->mtp3_timer[MTP3_TIMER_Q707_T2] = ss7_schedule_event(link->master, link->master->mtp3_timers[MTP3_TIMER_Q707_T2], mtp3_timer_q707_t2_expiry, link);
}
}
static void mtp3_move_buffer(struct ss7 *ss7, struct mtp2 *link, struct ss7_msg **from, struct ss7_msg **to, int dpc, int fsn)
{
struct ss7_msg *cur, *prev, *next, *dst;
unsigned char *buf;
unsigned char userpart;
struct routing_label rl;
if (fsn != -1) {
update_txbuf(NULL, from, fsn);
}
prev = NULL;
cur = *from;
if (to && *to) {
for (dst = *to; dst->next; dst = dst->next);
} else {
dst = NULL;
}
while (cur) {
buf = cur->buf;
userpart = get_userpart(buf[MTP2_SIZE]);
get_routinglabel(ss7->switchtype, buf + MTP2_SIZE + 1, &rl);
next = cur->next;
if (userpart > 3 && (dpc == -1 || rl.dpc == dpc)) {
if (cur == link->retransmit_pos) {
link->retransmit_pos = cur->next;
}
if (*from == link->tx_buf || *from == link->tx_q ||
*from == link->co_tx_buf || *from == link->co_tx_q) {
cur->size -= 2; /* mtp2_msu increased it before!!! */
}
if (prev) {
prev->next = cur->next;
} else {
*from = cur->next;
}
if (to) {
if (dst) {
dst->next = cur;
dst = dst->next;
} else {
*to = cur;
dst = cur;
}
dst->next = NULL;
} else {
free (cur);
}
} else {
prev = cur;
}
cur = next;
}
}
static void mtp3_transmit_buffer(struct ss7 *ss7, struct ss7_msg **buf)
{
unsigned char userpart;
struct routing_label rl;
struct ss7_msg *cur = *buf, *next;
int priority = -1;
while (cur) {
next = cur->next;
userpart = get_userpart(cur->buf[MTP2_SIZE]);
priority = get_priority(cur->buf[MTP2_SIZE]);
get_routinglabel(ss7->switchtype, cur->buf + MTP2_SIZE + 1, &rl);
mtp3_transmit(ss7, userpart, rl, priority, cur, NULL);
cur = next;
}
*buf = NULL;
}
void mtp3_free_co(struct mtp2 *link)
{
struct ss7_msg *cur;
while (link->co_tx_buf) {
cur = link->co_tx_buf;
link->co_tx_buf = link->co_tx_buf->next;
free(cur);
}
while (link->co_tx_q) {
cur = link->co_tx_q;
link->co_tx_q = link->co_tx_q->next;
free(cur);
}
}
static void mtp3_cancel_changeover(struct mtp2 *link)
{
if (link->mtp3_timer[MTP3_TIMER_T1] > -1) {
ss7_schedule_del(link->master, &link->mtp3_timer[MTP3_TIMER_T1]);
}
if (link->mtp3_timer[MTP3_TIMER_T2] > -1) {
ss7_schedule_del(link->master, &link->mtp3_timer[MTP3_TIMER_T2]);
}
link->got_sent_netmsg &= ~(SENT_COO | SENT_ECO);
mtp3_move_buffer(link->master, link, &link->co_tx_q, &link->cb_buf, -1, -1);
mtp3_move_buffer(link->master, link, &link->co_buf, &link->cb_buf, -1, -1);
link->changeover = NO_CHANGEOVER;
mtp3_free_co(link);
ss7_message(link->master, "Changeover cancelled on link SLC %i PC %i\n", link->slc, link->dpc);
}
static void mtp3_check(struct adjacent_sp *adj_sp)
{
if (!adj_sp) {
return;
}
struct ss7 *ss7 = adj_sp->master;
int i, count = 0;
for (i = 0; i < adj_sp->numlinks; i++) {
if (adj_sp->links[i]->std_test_passed) {
count++;
}
}
if (!count && adj_sp->state != MTP3_DOWN) {
adj_sp->state = MTP3_DOWN;
adj_sp->tra = 0;
if (adj_sp->timer_t19 > -1) {
ss7_schedule_del(ss7, &adj_sp->timer_t19);
ss7_debug_msg(ss7, SS7_DEBUG_MTP3, "MTP3 T19 timer stopped PC: %i\n", adj_sp->adjpc);
}
if (adj_sp->timer_t21 > -1) {
ss7_schedule_del(ss7, &adj_sp->timer_t21);
ss7_debug_msg(ss7, SS7_DEBUG_MTP3, "MTP3 T21 timer stopped PC: %i\n", adj_sp->adjpc);
}
for (i = 0; i < adj_sp->numlinks; i++) {
adj_sp->links[i]->got_sent_netmsg = 0;
mtp3_stop_all_timers_except_cocb(adj_sp->links[i]);
adj_sp->links[i]->inhibit &= ~INHIBITED_REMOTELY;
}
mtp3_destroy_all_routes(adj_sp);
ss7_error(ss7, "Adjacent SP PC: %i DOWN!!!\n", adj_sp->adjpc);
ss7_check(ss7);
return;
}
if (count && adj_sp->state != MTP3_UP && adj_sp->tra & GOT && adj_sp->tra & SENT) {
adj_sp->state = MTP3_UP;
ss7_message(ss7, "Adjacent SP PC: %i UP!!!\n", adj_sp->adjpc);
ss7_check(ss7);
}
}
static int mtp3_init(struct mtp2 *link)
{
int res;
struct adjacent_sp *adj_sp = link->adj_sp;
if (adj_sp->state == MTP3_DOWN) {
AUTORL(rl, link);
if (link->inhibit & INHIBITED_LOCALLY) {
return net_mng_send(link, NET_MNG_LIN, rl, 0);
} else if (!(adj_sp->tra & SENT)) {
res = net_mng_send(link, NET_MNG_TRA, rl, 0);
mtp3_check(adj_sp);
return res;
}
}
return 0;
}
static void mtp3_restart(struct mtp2 *link)
{
struct adjacent_sp *adj_sp = link->adj_sp;
int i;
adj_sp->state = MTP3_DOWN;
adj_sp->tra = 0;
for (i = 0; i < adj_sp->numlinks; i++) {
adj_sp->links[i]->inhibit &= ~INHIBITED_REMOTELY ;
adj_sp->links[i]->got_sent_netmsg = 0;
mtp3_stop_all_timers_except_cocb(adj_sp->links[i]);
}
mtp3_destroy_all_routes(adj_sp);
for (i = 0; i < adj_sp->numlinks; i++) {
if (!mtp3_init(adj_sp->links[i])) {
break;
}
}
ss7_check(link->master);
}
void mtp3_init_restart(struct ss7 *ss7, int slc)
{
struct mtp2 *link = slc_to_mtp2(ss7, slc);
if (!link) {
ss7_error(ss7, "signalling link does not exist\n");
return;
}
{
struct adjacent_sp *adj_sp = link->adj_sp;
if (adj_sp->timer_t19 > -1) {
ss7_schedule_del(ss7, &adj_sp->timer_t19);
}
if (adj_sp->timer_t21 > -1) {
ss7_schedule_del(ss7, &adj_sp->timer_t21);
}
}
mtp3_restart(link);
}
static void mtp3_t3_expired(void *data)
{
struct mtp2 *link = data;
link->mtp3_timer[MTP3_TIMER_T3] = -1;
link->changeover = NO_CHANGEOVER;
mtp3_transmit_buffer(link->master, &link->cb_buf);
ss7_check(link->master);
ss7_message(link->master, "Changeback completed on link SLC: %i PC: %i\n", link->slc, link->dpc);
mtp3_free_co(link);
}
static void mtp3_changeback(struct mtp2 *link)
{
if (link->inhibit) {
ss7_message(link->master, "Change back requested inhibited link, ignore SLC: %i PC: %i\n", link->slc, link->dpc);
return;
}
if (link->changeover == CHANGEOVER_IN_PROGRESS ||
link->changeover == CHANGEOVER_INITIATED) {
mtp3_cancel_changeover(link);
} else if (link->changeover != CHANGEBACK && link->changeover != NO_CHANGEOVER) {
mtp3_move_buffer(link->master, link, &link->tx_q, &link->cb_buf, -1, -1);
link->changeover = CHANGEBACK;
link->mtp3_timer[MTP3_TIMER_T3] = ss7_schedule_event(link->master, link->master->mtp3_timers[MTP3_TIMER_T3], &mtp3_t3_expired, link);
ss7_message(link->master, "Changeback started on link SLC %i PC %i\n", link->slc, link->dpc);
}
mtp3_check(link->adj_sp);
}
static void mtp3_cancel_changeback(struct mtp2 *link)
{
mtp3_move_buffer(link->master, link, &link->cb_buf, &link->co_buf, -1, -1);
link->changeover = NO_CHANGEOVER;
if (link->mtp3_timer[MTP3_TIMER_T3] > -1) {
ss7_schedule_del(link->master, &link->mtp3_timer[MTP3_TIMER_T3]);
}
if (link->mtp3_timer[MTP3_TIMER_T4] > -1) {
ss7_schedule_del(link->master, &link->mtp3_timer[MTP3_TIMER_T4]);
}
if (link->mtp3_timer[MTP3_TIMER_T5] > -1) {
ss7_schedule_del(link->master, &link->mtp3_timer[MTP3_TIMER_T5]);
}
ss7_message(link->master, "Changeback cancelled on link SLC %i PC %i\n", link->slc, link->dpc);
mtp3_check(link->adj_sp);
}
static void mtp3_t1_expired(void *data)
{
struct mtp2 *link = data;
link->mtp3_timer[MTP3_TIMER_T1] = -1;
link->changeover = CHANGEOVER_COMPLETED;
mtp3_transmit_buffer(link->master, &link->co_buf);
ss7_message(link->master, "Changeover completed on link SLC: %i PC: %i\n", link->slc, link->dpc);
mtp3_free_co(link);
}
static void mtp3_timed_changeover(struct mtp2 *link)
{
if (link->changeover == CHANGEBACK || link->changeover == CHANGEBACK_INITIATED) {
mtp3_cancel_changeback(link);
}
if (link->changeover == NO_CHANGEOVER) {
link->changeover = CHANGEOVER_IN_PROGRESS;
mtp3_move_buffer(link->master, link, &link->tx_q, &link->co_buf, -1, -1);
ss7_message(link->master, "Time controlled changeover initiated on link SLC: %i PC: %i\n", link->slc, link->dpc);
link->changeover = CHANGEOVER_IN_PROGRESS;
if (link->mtp3_timer[MTP3_TIMER_T1] > -1) {
ss7_schedule_del(link->master, &link->mtp3_timer[MTP3_TIMER_T1]);
}
link->mtp3_timer[MTP3_TIMER_T1] = ss7_schedule_event(link->master, link->master->mtp3_timers[MTP3_TIMER_T1], &mtp3_t1_expired, link);
mtp3_free_co(link);
}
}
static void mtp3_changeover(struct mtp2 *link, unsigned char fsn)
{
struct ss7_msg *tmp = NULL;
if (link->changeover == CHANGEBACK || link->changeover == CHANGEBACK_INITIATED) {
mtp3_cancel_changeback(link);
}
if (link->changeover == NO_CHANGEOVER ||
link->changeover == CHANGEOVER_INITIATED) {
mtp3_move_buffer(link->master, link, &link->co_tx_buf, &tmp, -1, fsn);
mtp3_move_buffer(link->master, link, &link->co_tx_q, &tmp, -1, -1);
mtp3_move_buffer(link->master, link, &link->co_buf, &tmp, -1, -1);
mtp3_transmit_buffer(link->master, &tmp);
link->changeover = CHANGEOVER_COMPLETED;
ss7_message (link->master, "Changeover completed on link SLC: %i PC: %i FSN: %i\n", link->slc, link->dpc, fsn);
mtp3_free_co(link);
mtp3_check(link->adj_sp);
}
}
static void mtp3_prepare_changeover(struct mtp2 *link)
{
if (link->changeover == CHANGEBACK || link->changeover == CHANGEBACK_INITIATED) {
mtp3_cancel_changeback(link);
}
if (link->changeover != CHANGEOVER_INITIATED) {
link->changeover = CHANGEOVER_INITIATED;
link->co_lastfsnacked = link->lastfsnacked;
link->co_tx_buf = link->tx_buf;
link->tx_buf = NULL;
link->co_tx_q = link->tx_q;
link->tx_q = NULL;
link->retransmit_pos = NULL;
}
#if 0
ss7_message(link->master, "Prepare changeover co_tx_buf:%i (%i) co_buf:%i (%i) %i\n",
link->co_tx_buf, len_buf(link->co_tx_buf), link->co_buf, len_buf(link->co_buf), link->co_tx_q);
#endif
}
static void mtp3_t19_expiry(void * data)
{
struct adjacent_sp *adj_sp = data;
adj_sp->timer_t19 = -1;
ss7_debug_msg(adj_sp->master, SS7_DEBUG_MTP3, "MTP3 T19 timer expired PC:%i\n", adj_sp->adjpc);
}
static void mtp3_t21_expiry(void * data)
{
struct adjacent_sp *adj_sp = data;
adj_sp->timer_t21 = -1;
adj_sp->tra |= GOT;
ss7_debug_msg(adj_sp->master, SS7_DEBUG_MTP3,
"MTP3 T21 timer expired on PC:%i. Started accepting traffic.\n", adj_sp->adjpc);
mtp3_check(adj_sp);
}
static void mtp3_t22_expired(void *data)
{
struct mtp2 *link = data;
struct ss7 *ss7 = link->master;
if (link->inhibit & INHIBITED_LOCALLY) {
AUTORL(rl, link);
net_mng_send(link, NET_MNG_LLT, rl, 0);
link->mtp3_timer[MTP3_TIMER_T22] = ss7_schedule_event(ss7, ss7->mtp3_timers[MTP3_TIMER_T22], &mtp3_t22_expired, link);
} else {
link->mtp3_timer[MTP3_TIMER_T22] = -1;
}
}
static void mtp3_t23_expired(void *data)
{
struct mtp2 *link = data;
struct ss7 *ss7 = link->master;
if (link->inhibit & INHIBITED_REMOTELY) {
AUTORL(rl, link);
net_mng_send(link, NET_MNG_LRT, rl, 0);
link->mtp3_timer[MTP3_TIMER_T23] = ss7_schedule_event(ss7, ss7->mtp3_timers[MTP3_TIMER_T23], &mtp3_t23_expired, link);
} else {
link->mtp3_timer[MTP3_TIMER_T23] = -1;
}
}
static inline unsigned int pc2int(unsigned int switchtype, unsigned char *p)
{
/* from get_routinglabel() */
if (switchtype == SS7_ANSI) {
return p[0] | (p[1] << 8) | (p[2] << 16);
} else {
return (p[0] | (p[1] << 8)) & 0x3fff;
}
}
static void mtp3_t10_expired(void *data)
{
struct mtp3_route *route = data;
struct adjacent_sp *adj_sp = route->owner;
struct ss7 *ss7 = adj_sp->master;
struct routing_label rl;
rl.dpc = adj_sp->adjpc;
rl.opc = ss7->pc;
rl.sls = adj_sp->links[0]->net_mng_sls;
net_mng_send(adj_sp->links[0], NET_MNG_RST, rl, route->dpc);
route->t10 = ss7_schedule_event(ss7, ss7->mtp3_timers[MTP3_TIMER_T10], &mtp3_t10_expired, route);
}
static void mtp3_forced_reroute(struct adjacent_sp *adj_sp, struct mtp3_route *route)
{
int i = 0;
struct ss7 *ss7 = adj_sp->master;
struct mtp2 *link;
for (i = 0; i < adj_sp->numlinks; i++) {
link = adj_sp->links[i];
mtp3_move_buffer(ss7, link, &link->tx_q, &route->q, route->dpc, -1);
mtp3_move_buffer(ss7, link, &link->co_tx_q, &route->q, route->dpc, -1);
mtp3_move_buffer(ss7, link, &link->co_buf, &route->q, route->dpc, -1);
mtp3_move_buffer(ss7, link, &link->cb_buf, &route->q, route->dpc, -1);
mtp3_move_buffer(ss7, link, &link->tx_buf, NULL, route->dpc, -1);
mtp3_move_buffer(ss7, link, &link->co_tx_buf, NULL, route->dpc, -1);
}
if (route->t6 > -1) {
ss7_schedule_del(ss7, &route->t6);
}