/* Leave from the all rip routers multicast group. */
static int
ripng_multicast_leave (struct interface *ifp)
{
int ret;
struct ipv6_mreq mreq;
if (if_is_up (ifp) && if_is_multicast (ifp)) {
memset (&mreq, 0, sizeof (mreq));
inet_pton(AF_INET6, RIPNG_GROUP, &mreq.ipv6mr_multiaddr);
mreq.ipv6mr_interface = ifp->ifindex;
ret = setsockopt (ripng->sock, IPPROTO_IPV6, IPV6_LEAVE_GROUP,
(char *) &mreq, sizeof (mreq));
if (ret < 0)
zlog_warn ("can't setsockopt IPV6_LEAVE_GROUP: %s\n", safe_strerror (errno));
if (IS_RIPNG_DEBUG_EVENT)
zlog_debug ("RIPng %s leave from all-rip-routers multicast group",
ifp->name);
if (ret < 0)
return -1;
}
return 0;
}
/* Multicast packet receive socket. */
static int
rip_multicast_join (struct interface *ifp, int sock)
{
struct listnode *cnode;
struct connected *ifc;
if (if_is_operative (ifp) && if_is_multicast (ifp))
{
if (IS_RIP_DEBUG_EVENT)
zlog_debug ("multicast join at %s", ifp->name);
for (ALL_LIST_ELEMENTS_RO (ifp->connected, cnode, ifc))
{
struct prefix_ipv4 *p;
struct in_addr group;
p = (struct prefix_ipv4 *) ifc->address;
if (p->family != AF_INET)
continue;
group.s_addr = htonl (INADDR_RIP_GROUP);
if (ipv4_multicast_join (sock, group, p->prefix, ifp->ifindex) < 0)
return -1;
else
return 0;
}
}
return 0;
}
/* Leave from multicast group. */
static void
rip_multicast_leave (struct interface *ifp, int sock)
{
struct listnode *cnode;
struct connected *connected;
if (if_is_up (ifp) && if_is_multicast (ifp))
{
if (IS_RIP_DEBUG_EVENT)
zlog_debug ("multicast leave from %s", ifp->name);
for (ALL_LIST_ELEMENTS_RO (ifp->connected, cnode, connected))
{
struct prefix_ipv4 *p;
struct in_addr group;
p = (struct prefix_ipv4 *) connected->address;
if (p->family != AF_INET)
continue;
group.s_addr = htonl (INADDR_RIP_GROUP);
if (ipv4_multicast_leave (sock, group, p->prefix, ifp->ifindex) == 0)
return;
}
}
}
/* Send RIP request packet to specified interface. */
static void
rip_request_interface_send (struct interface *ifp, u_char version)
{
struct sockaddr_in to;
/* RIPv2 support multicast. */
if (version == RIPv2 && if_is_multicast (ifp))
{
if (IS_RIP_DEBUG_EVENT)
zlog_debug ("multicast request on %s", ifp->name);
rip_request_send (NULL, ifp, version, NULL);
return;
}
/* RIPv1 and non multicast interface. */
if (if_is_pointopoint (ifp) || if_is_broadcast (ifp))
{
struct listnode *cnode, *cnnode;
struct connected *connected;
if (IS_RIP_DEBUG_EVENT)
zlog_debug ("broadcast request to %s", ifp->name);
for (ALL_LIST_ELEMENTS (ifp->connected, cnode, cnnode, connected))
{
if (connected->address->family == AF_INET)
{
memset (&to, 0, sizeof (struct sockaddr_in));
to.sin_port = htons (RIP_PORT_DEFAULT);
if (connected->destination)
/* use specified broadcast or peer destination addr */
to.sin_addr = connected->destination->u.prefix4;
else if (connected->address->prefixlen < IPV4_MAX_PREFIXLEN)
/* calculate the appropriate broadcast address */
to.sin_addr.s_addr =
ipv4_broadcast_addr(connected->address->u.prefix4.s_addr,
connected->address->prefixlen);
else
/* do not know where to send the packet */
continue;
if (IS_RIP_DEBUG_EVENT)
zlog_debug ("SEND request to %s", inet_ntoa (to.sin_addr));
rip_request_send (&to, ifp, version, connected);
}
}
}
}
/* Join to the all rip routers multicast group. */
static int
ripng_multicast_join (struct interface *ifp)
{
int ret;
struct ipv6_mreq mreq;
int save_errno;
if (if_is_up (ifp) && if_is_multicast (ifp)) {
memset (&mreq, 0, sizeof (mreq));
inet_pton(AF_INET6, RIPNG_GROUP, &mreq.ipv6mr_multiaddr);
mreq.ipv6mr_interface = ifp->ifindex;
/*
* NetBSD 1.6.2 requires root to join groups on gif(4).
* While this is bogus, privs are available and easy to use
* for this call as a workaround.
*/
if (ripngd_privs.change (ZPRIVS_RAISE))
zlog_err ("ripng_multicast_join: could not raise privs");
ret = setsockopt (ripng->sock, IPPROTO_IPV6, IPV6_JOIN_GROUP,
(char *) &mreq, sizeof (mreq));
save_errno = errno;
if (ripngd_privs.change (ZPRIVS_LOWER))
zlog_err ("ripng_multicast_join: could not lower privs");
if (ret < 0 && save_errno == EADDRINUSE)
{
/*
* Group is already joined. This occurs due to sloppy group
* management, in particular declining to leave the group on
* an interface that has just gone down.
*/
zlog_warn ("ripng join on %s EADDRINUSE (ignoring)\n", ifp->name);
return 0; /* not an error */
}
if (ret < 0)
zlog_warn ("can't setsockopt IPV6_JOIN_GROUP: %s",
safe_strerror (save_errno));
if (IS_RIPNG_DEBUG_EVENT)
zlog_debug ("RIPng %s join to all-rip-routers multicast group", ifp->name);
if (ret < 0)
return -1;
}
return 0;
}
