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In regular forwarding path, reject packets destined for 169.254.0.0/16

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link-local addresses. See RFC 3927 section 2.7.
This commit is contained in:
bms 2007-02-03 06:45:51 +00:00
parent 6443ab2e87
commit b6b883252e
2 changed files with 7 additions and 1 deletions
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2
sys/netinet/in.c
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@ -141,7 +141,7 @@ in_canforward(in)
register u_long i = ntohl(in.s_addr);
register u_long net;
if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i))
if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i) || IN_LINKLOCAL(i))
return (0);
if (IN_CLASSA(i)) {
net = i & IN_CLASSA_NET;

6
sys/netinet/ip_input.c
View File

@ -528,6 +528,12 @@ ip_input(struct mbuf *m)
#endif
}
}
/* RFC 3927 2.7: Do not forward datagrams for 169.254.0.0/16. */
if (IN_LINKLOCAL(ntohl(ip->ip_dst.s_addr))) {
ipstat.ips_cantforward++;
m_freem(m);
return;
}
if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
struct in_multi *inm;
if (ip_mrouter) {