No longer prevent TCP connections to IPv6 anycast addresses.
RFC 4291 dropped this requirement from RFC 3513:
o An anycast address must not be used as the source address of an
IPv6 packet.
And from that requirement draft-itojun-ipv6-tcp-to-anycast rightly
concluded that TCP connections must be prevented.
The draft also states:
The proposed method MUST be removed when one of the following events
happens in the future:
o Restriction imposed on IPv6 anycast address is loosened, so that
anycast address can be placed into source address field of the IPv6
header[...]
OK?
diff --git share/man/man9/mbuf.9 share/man/man9/mbuf.9
index 6f798945437..ab02c36798f 100644
--- share/man/man9/mbuf.9
+++ share/man/man9/mbuf.9
@@ -306,8 +306,6 @@ protocol-specific.
variable is valid.
.It Dv M_LOOP
packet has been sent from local machine.
-.It Dv M_ACAST
-received as IPv6 anycast.
.It Dv M_BCAST
packet sent/received as link-level broadcast.
.It Dv M_MCAST
diff --git sys/netinet/ip_input.c sys/netinet/ip_input.c
index 1b511d14a4b..40c2f675959 100644
--- sys/netinet/ip_input.c
+++ sys/netinet/ip_input.c
@@ -619,20 +619,6 @@ ip_deliver(struct mbuf **mp, int *offp, int nxt, int af)
goto bad;
}
-#ifdef INET6
- /* draft-itojun-ipv6-tcp-to-anycast */
- if (af == AF_INET6 &&
- ISSET((*mp)->m_flags, M_ACAST) && (nxt == IPPROTO_TCP)) {
- if ((*mp)->m_len >= sizeof(struct ip6_hdr)) {
- icmp6_error(*mp, ICMP6_DST_UNREACH,
- ICMP6_DST_UNREACH_ADDR,
- offsetof(struct ip6_hdr, ip6_dst));
- *mp = NULL;
- }
- goto bad;
- }
-#endif /* INET6 */
-
#ifdef IPSEC
if (ipsec_in_use) {
if (ipsec_local_check(*mp, *offp, nxt, af) != 0) {
diff --git sys/netinet6/ip6_input.c sys/netinet6/ip6_input.c
index 64489f53b48..6c1beb6866c 100644
--- sys/netinet6/ip6_input.c
+++ sys/netinet6/ip6_input.c
@@ -424,8 +424,6 @@ ip6_input_if(struct mbuf **mp, int *offp, int nxt, int af,
struct ifnet *ifp)
*/
if (rtisvalid(rt) && ISSET(rt->rt_flags, RTF_LOCAL)) {
struct in6_ifaddr *ia6 = ifatoia6(rt->rt_ifa);
- if (ia6->ia6_flags & IN6_IFF_ANYCAST)
- m->m_flags |= M_ACAST;
if (ip6_forwarding == 0 && rt->rt_ifidx != ifp->if_index &&
!((ifp->if_flags & IFF_LOOPBACK) ||
--
I'm not entirely sure you are real.
