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udp: Fix bogus UFO packet generation

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It has been reported that the new UFO software fallback path
fails under certain conditions with NFS.  I tracked the problem
down to the generation of UFO packets that are smaller than the
MTU.  The software fallback path simply discards these packets.

This patch fixes the problem by not generating such packets on
the UFO path.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2010-06-15 01:52:25 +00:00 committed by David S. Miller
parent 13fea6d4f7
commit 26cde9f7e2
1 changed files with 6 additions and 3 deletions
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9
net/ipv4/ip_output.c
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@ -873,8 +873,10 @@ int ip_append_data(struct sock *sk,
!exthdrlen)
csummode = CHECKSUM_PARTIAL;
skb = skb_peek_tail(&sk->sk_write_queue);
inet->cork.length += length;
if (((length> mtu) || !skb_queue_empty(&sk->sk_write_queue)) &&
if (((length > mtu) || (skb && skb_is_gso(skb))) &&
(sk->sk_protocol == IPPROTO_UDP) &&
(rt->u.dst.dev->features & NETIF_F_UFO)) {
err = ip_ufo_append_data(sk, getfrag, from, length, hh_len,
@ -892,7 +894,7 @@ int ip_append_data(struct sock *sk,
* adding appropriate IP header.
*/
if ((skb = skb_peek_tail(&sk->sk_write_queue)) == NULL)
if (!skb)
goto alloc_new_skb;
while (length > 0) {
@ -1121,7 +1123,8 @@ ssize_t ip_append_page(struct sock *sk, struct page *page,
return -EINVAL;
inet->cork.length += size;
if ((sk->sk_protocol == IPPROTO_UDP) &&
if ((size + skb->len > mtu) &&
(sk->sk_protocol == IPPROTO_UDP) &&
(rt->u.dst.dev->features & NETIF_F_UFO)) {
skb_shinfo(skb)->gso_size = mtu - fragheaderlen;
skb_shinfo(skb)->gso_type = SKB_GSO_UDP;