static void pim_addr_change(struct interface *ifp)
{
struct pim_interface *pim_ifp;
pim_ifp = ifp->info;
zassert(pim_ifp);
pim_if_dr_election(ifp); /* router's own DR Priority (addr) changes -- Done TODO T30 */
pim_if_update_join_desired(pim_ifp); /* depends on DR */
pim_if_update_could_assert(ifp); /* depends on DR */
pim_if_update_my_assert_metric(ifp); /* depends on could_assert */
pim_if_update_assert_tracking_desired(ifp); /* depends on DR, join_desired */
/*
RFC 4601: 4.3.1. Sending Hello Messages
1) 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).
-- FIXME See CAVEAT C13
2) After an interface has changed its IP address, it MUST send a
Hello message with its new IP address.
-- DONE below
3) If an interface changes one of its secondary IP addresses, a
Hello message with an updated Address_List option and a non-zero
HoldTime should be sent immediately.
-- FIXME See TODO T31
*/
pim_ifp->pim_ifstat_hello_sent = 0; /* reset hello counter */
if (pim_ifp->pim_sock_fd < 0)
return;
pim_hello_restart_now(ifp); /* send hello and restart timer */
}
/*
RFC 4601: 4.3.2. DR Election
A router's idea of the current DR on an interface can change when a
PIM Hello message is received, when a neighbor times out, or when a
router's own DR Priority changes.
*/
int pim_if_dr_election(struct interface *ifp)
{
struct pim_interface *pim_ifp = ifp->info;
struct in_addr old_dr_addr;
++pim_ifp->pim_dr_election_count;
old_dr_addr = pim_ifp->pim_dr_addr;
if (pim_ifp->pim_dr_num_nondrpri_neighbors) {
dr_election_by_addr(ifp);
}
else {
dr_election_by_pri(ifp);
}
/* DR changed ? */
if (old_dr_addr.s_addr != pim_ifp->pim_dr_addr.s_addr) {
if (PIM_DEBUG_PIM_EVENTS) {
char dr_old_str[100];
char dr_new_str[100];
pim_inet4_dump("<old_dr?>", old_dr_addr, dr_old_str, sizeof(dr_old_str));
pim_inet4_dump("<new_dr?>", pim_ifp->pim_dr_addr, dr_new_str, sizeof(dr_new_str));
zlog_debug("%s: DR was %s now is %s on interface %s",
__PRETTY_FUNCTION__,
dr_old_str, dr_new_str, ifp->name);
}
pim_ifp->pim_dr_election_last = pim_time_monotonic_sec(); /* timestamp */
++pim_ifp->pim_dr_election_changes;
pim_if_update_join_desired(pim_ifp);
pim_if_update_could_assert(ifp);
pim_if_update_assert_tracking_desired(ifp);
return 1;
}
return 0;
}