void sig_handler(int sig)
{
int ret;
if (sig == SIGUSR1) {
mld_query_send();
return;
}
if (sig == SIGUSR2) {
ret = iface_map_get();
if (ret < 0)
goto exit;
ret = iface_info_glue();
if (ret < 0)
goto exit;
pim_hello_send(NULL);
return;
}
exit:
running = 0;
signals(SIG_IGN);
pim_hello_send(NULL);
}
/*
RFC 4601: 4.3.1. Sending Hello Messages
Thus, if a router needs to send a Join/Prune or Assert message on an
interface on which it has not yet sent a Hello message with the
currently configured IP address, then it MUST immediately send the
relevant Hello message without waiting for the Hello Timer to
expire, followed by the Join/Prune or Assert message.
*/
void pim_hello_restart_now(struct interface *ifp)
{
struct pim_interface *pim_ifp;
zassert(ifp);
pim_ifp = ifp->info;
zassert(pim_ifp);
/*
* Reset next hello timer
*/
hello_resched(ifp);
/*
* Immediately send hello
*/
pim_hello_send(ifp, PIM_IF_DEFAULT_HOLDTIME(pim_ifp));
}
/*
Periodic hello timer
*/
static int on_pim_hello_send(struct thread *t)
{
struct pim_interface *pim_ifp;
struct interface *ifp;
zassert(t);
ifp = THREAD_ARG(t);
zassert(ifp);
pim_ifp = ifp->info;
/*
* Schedule next hello
*/
pim_ifp->t_pim_hello_timer = 0;
hello_resched(ifp);
/*
* Send hello
*/
return pim_hello_send(ifp, PIM_IF_DEFAULT_HOLDTIME(pim_ifp));
}
void pim_sock_delete(struct interface *ifp, const char *delete_message)
{
zlog_info("PIM INTERFACE DOWN: on interface %s: %s",
ifp->name, delete_message);
if (!ifp->info) {
zlog_err("%s: %s: but PIM not enabled on interface %s (!)",
__PRETTY_FUNCTION__, delete_message, ifp->name);
return;
}
/*
RFC 4601: 4.3.1. Sending Hello Messages
Before an interface goes down or changes primary IP address, a Hello
message with a zero HoldTime should be sent immediately (with the
old IP address if the IP address changed).
*/
pim_hello_send(ifp, 0 /* zero-sec holdtime */);
pim_neighbor_delete_all(ifp, delete_message);
sock_close(ifp);
}
