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netfilter: conntrack: fix CT target for UNSPEC helpers 

Thomas reports its not possible to attach the H.245 helper:

iptables -t raw -A PREROUTING -p udp -j CT --helper H.245
iptables: No chain/target/match by that name.
xt_CT: No such helper "H.245"

This is because H.245 registers as NFPROTO_UNSPEC, but the CT target
passes NFPROTO_IPV4/IPV6 to nf_conntrack_helper_try_module_get.

We should treat UNSPEC as wildcard and ignore the l3num instead.

Reported-by: Thomas Woerner <twoerner@redhat.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2016-11-03 14:44:42 +01:00 committed by Pablo Neira Ayuso
parent fb9c9649a1
commit 6114cc516d
1 changed files with 8 additions and 3 deletions
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11
net/netfilter/nf_conntrack_helper.c
View File

@ -138,9 +138,14 @@ __nf_conntrack_helper_find(const char *name, u16 l3num, u8 protonum)
for (i = 0; i < nf_ct_helper_hsize; i++) {
hlist_for_each_entry_rcu(h, &nf_ct_helper_hash[i], hnode) {
if (!strcmp(h->name, name) &&
h->tuple.src.l3num == l3num &&
h->tuple.dst.protonum == protonum)
if (strcmp(h->name, name))
continue;
if (h->tuple.src.l3num != NFPROTO_UNSPEC &&
h->tuple.src.l3num != l3num)
continue;
if (h->tuple.dst.protonum == protonum)
return h;
}
}