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netfilter: nf_conntrack_sip: remove direct dependency on IPv6 

Previous implementation was not usable with CONFIG_IPV6=m.

Fixes: a3419ce335 ("netfilter: nf_conntrack_sip: add sip_external_media logic")
Signed-off-by: Alin Nastac <alin.nastac@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Alin Nastac 2019-03-11 17:18:42 +01:00 committed by Pablo Neira Ayuso
parent 4ec850e5df
commit 29b0b5d565
1 changed files with 16 additions and 21 deletions
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37
net/netfilter/nf_conntrack_sip.c
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@ -20,9 +20,9 @@
#include <linux/udp.h>
#include <linux/tcp.h>
#include <linux/netfilter.h>
#include <linux/netfilter_ipv4.h>
#include <linux/netfilter_ipv6.h>
#include <net/route.h>
#include <net/ip6_route.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_core.h>
#include <net/netfilter/nf_conntrack_expect.h>
@ -871,38 +871,33 @@ static int set_expected_rtp_rtcp(struct sk_buff *skb, unsigned int protoff,
} else if (sip_external_media) {
struct net_device *dev = skb_dst(skb)->dev;
struct net *net = dev_net(dev);
struct rtable *rt;
struct flowi4 fl4 = {};
#if IS_ENABLED(CONFIG_IPV6)
struct flowi6 fl6 = {};
#endif
struct flowi fl;
struct dst_entry *dst = NULL;
memset(&fl, 0, sizeof(fl));
switch (nf_ct_l3num(ct)) {
case NFPROTO_IPV4:
fl4.daddr = daddr->ip;
rt = ip_route_output_key(net, &fl4);
if (!IS_ERR(rt))
dst = &rt->dst;
fl.u.ip4.daddr = daddr->ip;
nf_ip_route(net, &dst, &fl, false);
break;
#if IS_ENABLED(CONFIG_IPV6)
case NFPROTO_IPV6:
fl6.daddr = daddr->in6;
dst = ip6_route_output(net, NULL, &fl6);
if (dst->error) {
dst_release(dst);
dst = NULL;
}
fl.u.ip6.daddr = daddr->in6;
nf_ip6_route(net, &dst, &fl, false);
break;
#endif
}
/* Don't predict any conntracks when media endpoint is reachable
* through the same interface as the signalling peer.
*/
if (dst && dst->dev == dev)
return NF_ACCEPT;
if (dst) {
bool external_media = (dst->dev == dev);
dst_release(dst);
if (external_media)
return NF_ACCEPT;
}
}
/* We need to check whether the registration exists before attempting