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[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>
This commit is contained in:
Masahide NAKAMURA 2007-02-12 11:16:17 -08:00 committed by David S. Miller
parent 601e68e100
commit 138939e066
1 changed files with 7 additions and 0 deletions
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7
net/ipv6/netfilter/ip6t_mh.c
View File

@ -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));
}