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authorMasahide NAKAMURA <nakam@linux-ipv6.org>2007-02-12 11:16:17 -0800
committerDavid S. Miller <davem@davemloft.net>2007-02-12 11:16:17 -0800
commit138939e0662ccb0e805aefe400bcf9cfcbece8e7 (patch)
tree9c3ec935238bc2850435230b099c12dfc216f1dc
parent[NETFILTER]: Fix whitespace errors (diff)
downloadlinux-dev-138939e0662ccb0e805aefe400bcf9cfcbece8e7.tar.xz
linux-dev-138939e0662ccb0e805aefe400bcf9cfcbece8e7.zip
[NETFILTER]: ip6t_mh: drop piggyback payload packet on MH packets
Regarding RFC3775, MH payload proto field should be IPPROTO_NONE. Otherwise it must be discarded (and the receiver should send ICMP error). We assume filter should drop such piggyback everytime to disallow slipping through firewall rules, even the final receiver will discard it. Signed-off-by: Masahide NAKAMURA <nakam@linux-ipv6.org> Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to '')
-rw-r--r--net/ipv6/netfilter/ip6t_mh.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/net/ipv6/netfilter/ip6t_mh.c b/net/ipv6/netfilter/ip6t_mh.c
index 2c7efc6a506d..c2a909893a64 100644
--- a/net/ipv6/netfilter/ip6t_mh.c
+++ b/net/ipv6/netfilter/ip6t_mh.c
@@ -66,6 +66,13 @@ match(const struct sk_buff *skb,
return 0;
}
+ if (mh->ip6mh_proto != IPPROTO_NONE) {
+ duprintf("Dropping invalid MH Payload Proto: %u\n",
+ mh->ip6mh_proto);
+ *hotdrop = 1;
+ return 0;
+ }
+
return type_match(mhinfo->types[0], mhinfo->types[1], mh->ip6mh_type,
!!(mhinfo->invflags & IP6T_MH_INV_TYPE));
}