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authorEric Dumazet <edumazet@google.com>2013-11-07 18:32:06 -0800
committerDavid S. Miller <davem@davemloft.net>2013-11-08 02:07:59 -0500
commitdcd607718385d02ce3741de225927a57f528f93b (patch)
tree48dcb0b8e4a43c92d9ca90bfb4fdcb4482af159f /net/ipv4
parent0b2e2d36d152a94082f05ad226a290d765ffb7d2 (diff)
inet: fix a UFO regression
While testing virtio_net and skb_segment() changes, Hannes reported that UFO was sending wrong frames. It appears this was introduced by a recent commit : 8c3a897bfab1 ("inet: restore gso for vxlan") The old condition to perform IP frag was : tunnel = !!skb->encapsulation; ... if (!tunnel && proto == IPPROTO_UDP) { So the new one should be : udpfrag = !skb->encapsulation && proto == IPPROTO_UDP; ... if (udpfrag) { Initialization of udpfrag must be done before call to ops->callbacks.gso_segment(skb, features), as skb_udp_tunnel_segment() clears skb->encapsulation (We want udpfrag to be true for UFO, false for VXLAN) With help from Alexei Starovoitov Reported-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Alexei Starovoitov <ast@plumgrid.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/af_inet.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index 09d78d4a3cf..68af9aac91d 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -1299,6 +1299,9 @@ static struct sk_buff *inet_gso_segment(struct sk_buff *skb,
segs = ERR_PTR(-EPROTONOSUPPORT);
+ /* Note : following gso_segment() might change skb->encapsulation */
+ udpfrag = !skb->encapsulation && proto == IPPROTO_UDP;
+
ops = rcu_dereference(inet_offloads[proto]);
if (likely(ops && ops->callbacks.gso_segment))
segs = ops->callbacks.gso_segment(skb, features);
@@ -1306,7 +1309,6 @@ static struct sk_buff *inet_gso_segment(struct sk_buff *skb,
if (IS_ERR_OR_NULL(segs))
goto out;
- udpfrag = !!skb->encapsulation && proto == IPPROTO_UDP;
skb = segs;
do {
iph = (struct iphdr *)(skb_mac_header(skb) + nhoff);