netfilter: restore lost ifdef guarding defrag exception

netfilter: restore lost #ifdef guarding defrag exception

Upstream commit 38f7ac3eb:

Nir Tzachar <nir.tzachar@gmail.com> reported a warning when sending
fragments over loopback with NAT:

[ 6658.338121] WARNING: at net/ipv4/netfilter/nf_nat_standalone.c:89 nf_nat_fn+0x33/0x155()

The reason is that defragmentation is skipped for already tracked connections.
This is wrong in combination with NAT and ip_conntrack actually had some ifdefs
to avoid this behaviour when NAT is compiled in.

The entire "optimization" may seem a bit silly, for now simply restoring the
lost #ifdef is the easiest solution until we can come up with something better.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
index 5a955c440364728d3002a09213790273bb924339..7eb0b6176d7f344c102cd35e6ac58241bb39887a 100644 (file)
--- a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
+++ b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
@@ -150,10 +150,12 @@ static unsigned int ipv4_conntrack_defrag(unsigned int hooknum,
                                          const struct net_device *out,
                                          int (*okfn)(struct sk_buff *))
 {
+#if !defined(CONFIG_NF_NAT) && !defined(CONFIG_NF_NAT_MODULE)
        /* Previously seen (loopback)?  Ignore.  Do this before
           fragment check. */
        if (skb->nfct)
                return NF_ACCEPT;
+#endif
 
        /* Gather fragments. */
        if (ip_hdr(skb)->frag_off & htons(IP_MF | IP_OFFSET)) {