From 138939e0662ccb0e805aefe400bcf9cfcbece8e7 Mon Sep 17 00:00:00 2001 From: Masahide NAKAMURA Date: Mon, 12 Feb 2007 11:16:17 -0800 Subject: [PATCH] [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 Signed-off-by: Patrick McHardy Signed-off-by: David S. Miller --- net/ipv6/netfilter/ip6t_mh.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/net/ipv6/netfilter/ip6t_mh.c b/net/ipv6/netfilter/ip6t_mh.c index 2c7efc6a50..c2a909893a 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)); } -- 2.39.5