int
ospf_if_ipmulticast (struct ospf *top, struct prefix *p, unsigned int ifindex)
{
u_char val;
int ret, len;
val = 0;
len = sizeof (val);
/* Prevent receiving self-origined multicast packets. */
ret = setsockopt (top->fd, IPPROTO_IP, IP_MULTICAST_LOOP, (void *)&val, len);
if (ret < 0)
zlog_warn ("can't setsockopt IP_MULTICAST_LOOP(0): %s", strerror (errno));
/* Explicitly set multicast ttl to 1 -- endo. */
val = 1;
ret = setsockopt (top->fd, IPPROTO_IP, IP_MULTICAST_TTL, (void *)&val, len);
if (ret < 0)
zlog_warn ("can't setsockopt IP_MULTICAST_TTL(1): %s", strerror (errno));
ret = setsockopt_multicast_ipv4 (top->fd, IP_MULTICAST_IF,
p->u.prefix4, 0, ifindex);
if (ret < 0)
zlog_warn ("can't setsockopt IP_MULTICAST_IF: %s", strerror (errno));
return ret;
}
int
ospf_if_add_allspfrouters_oisock (struct ospf *top, struct prefix *p,
unsigned int ifindex,struct ospf_interface *oi)
{
int ret;
ret = setsockopt_multicast_ipv4 (oi->packet_fd, IP_ADD_MEMBERSHIP,
p->u.prefix4, htonl (OSPF_ALLSPFROUTERS),ifindex);
return ret;
}
int set_mcast_if(struct sockaddr *int_addr)
{
struct in_addr if_addr;
if_addr.s_addr = satosin(*int_addr)->sin_addr.s_addr;
return setsockopt_multicast_ipv4(sock,
IP_MULTICAST_IF,
if_addr,
0xE0000009,
0);
}
int mcast_leave(struct sockaddr *int_addr)
{
struct in_addr if_addr;
if_addr.s_addr = satosin(*int_addr)->sin_addr.s_addr;
return setsockopt_multicast_ipv4(sock,
IP_DROP_MEMBERSHIP,
if_addr,
0xE0000009,
0);
}
/* Join to the OSPF ALL Designated ROUTERS multicast group. */
int
ospf_if_add_alldrouters (struct ospf *top, struct prefix *p, unsigned int
ifindex)
{
int ret;
ret = setsockopt_multicast_ipv4 (top->fd, IP_ADD_MEMBERSHIP,
p->u.prefix4, htonl (OSPF_ALLDROUTERS),
ifindex);
if (ret < 0)
zlog_warn ("can't setsockopt IP_ADD_MEMBERSHIP (AllDRouters): %s",
strerror (errno));
else
zlog_info ("interface %s join AllDRouters Multicast group.",
inet_ntoa (p->u.prefix4));
return ret;
}
int
ospf_if_drop_allspfrouters (struct ospf *top, struct prefix *p,
unsigned int ifindex)
{
int ret;
ret = setsockopt_multicast_ipv4 (top->fd, IP_DROP_MEMBERSHIP,
p->u.prefix4, htonl (OSPF_ALLSPFROUTERS),
ifindex);
if (ret < 0)
zlog_warn ("can't setsockopt IP_DROP_MEMBERSHIP (fd %d, addr %s, "
"ifindex %u, AllSPFRouters): %s",
top->fd, inet_ntoa(p->u.prefix4), ifindex, safe_strerror(errno));
else
zlog_info ("interface %s [%u] leave AllSPFRouters Multicast group.",
inet_ntoa (p->u.prefix4), ifindex);
return ret;
}
int
ospf_if_ipmulticast_hello (struct ospf *top, struct prefix *p, unsigned int ifindex)
{
u_char val;
int ret, len;
val = 0;
len = sizeof (val);
/* Prevent receiving self-origined multicast packets. */
ret = setsockopt (top->fd_hello, IPPROTO_IP, IP_MULTICAST_LOOP, (void *)&val, len);
/* Explicitly set multicast ttl to 1 -- endo. */
val = 1;
ret = setsockopt (top->fd_hello, IPPROTO_IP, IP_MULTICAST_TTL, (void *)&val, len);
ret = setsockopt_multicast_ipv4 (top->fd_hello, IP_MULTICAST_IF,
p->u.prefix4, 0, ifindex);
return ret;
}
/* Join to the OSPF ALL SPF ROUTERS multicast group. */
int
ospf_if_add_allspfrouters (struct ospf *top, struct prefix *p,
unsigned int ifindex)
{
int ret;
ret = setsockopt_multicast_ipv4 (top->fd, IP_ADD_MEMBERSHIP,
p->u.prefix4, htonl (OSPF_ALLSPFROUTERS),
ifindex);
if (ret < 0)
zlog_warn ("can't setsockopt IP_ADD_MEMBERSHIP (fd %d, addr %s, "
"ifindex %u, AllSPFRouters): %s; perhaps a kernel limit "
"on # of multicast group memberships has been exceeded?",
top->fd, inet_ntoa(p->u.prefix4), ifindex, safe_strerror(errno));
else
zlog_info ("interface %s [%u] join AllSPFRouters Multicast group.",
inet_ntoa (p->u.prefix4), ifindex);
return ret;
}
