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netfilter: nf_conntrack_sip: allow duplicate SDP expectations 

Callum Sinclair reported SIP IP Phone errors that he tracked down to
such phones sending session descriptions for different media types but
with same port numbers.

The expect core will only 'refresh' existing expectation if it is
from same master AND same expectation class (media type).
As expectation class is different, we get an error.

The SIP connection tracking code will then

1). drop the SDP packet
2). if an rtp expectation was already installed successfully,
    error on rtcp expectation will cancel the rtp one.

Make the expect core report back to caller when the conflict is due
to different expectation class and have SIP tracker ignore soft-error.

Reported-by: Callum Sinclair <Callum.Sinclair@alliedtelesis.co.nz>
Tested-by: Callum Sinclair <Callum.Sinclair@alliedtelesis.co.nz>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2018-04-03 12:10:09 +02:00 committed by Pablo Neira Ayuso
parent a2ac99905f
commit 876c27314c
2 changed files with 16 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
net/netfilter/nf_conntrack_expect.c
View File

@ -252,7 +252,7 @@ static inline int expect_clash(const struct nf_conntrack_expect *a,
static inline int expect_matches(const struct nf_conntrack_expect *a,
const struct nf_conntrack_expect *b)
{
return a->master == b->master && a->class == b->class &&
return a->master == b->master &&
nf_ct_tuple_equal(&a->tuple, &b->tuple) &&
nf_ct_tuple_mask_equal(&a->mask, &b->mask) &&
net_eq(nf_ct_net(a->master), nf_ct_net(b->master)) &&
@ -421,6 +421,9 @@ static inline int __nf_ct_expect_check(struct nf_conntrack_expect *expect)
h = nf_ct_expect_dst_hash(net, &expect->tuple);
hlist_for_each_entry_safe(i, next, &nf_ct_expect_hash[h], hnode) {
if (expect_matches(i, expect)) {
if (i->class != expect->class)
return -EALREADY;
if (nf_ct_remove_expect(i))
break;
} else if (expect_clash(i, expect)) {

16
net/netfilter/nf_conntrack_sip.c
View File

@ -938,11 +938,19 @@ static int set_expected_rtp_rtcp(struct sk_buff *skb, unsigned int protoff,
datalen, rtp_exp, rtcp_exp,
mediaoff, medialen, daddr);
else {
if (nf_ct_expect_related(rtp_exp) == 0) {
if (nf_ct_expect_related(rtcp_exp) != 0)
nf_ct_unexpect_related(rtp_exp);
else
/* -EALREADY handling works around end-points that send
* SDP messages with identical port but different media type,
* we pretend expectation was set up.
*/
int errp = nf_ct_expect_related(rtp_exp);
if (errp == 0 || errp == -EALREADY) {
int errcp = nf_ct_expect_related(rtcp_exp);
if (errcp == 0 || errcp == -EALREADY)
ret = NF_ACCEPT;
else if (errp == 0)
nf_ct_unexpect_related(rtp_exp);
}
}
nf_ct_expect_put(rtcp_exp);