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net: core: don't account for udp header size when computing seglen

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[ Upstream commit 6d39d589bb ]

In case of tcp, gso_size contains the tcpmss.

For UFO (udp fragmentation offloading) skbs, gso_size is the fragment
payload size, i.e. we must not account for udp header size.

Otherwise, when using virtio drivers, a to-be-forwarded UFO GSO packet
will be needlessly fragmented in the forward path, because we think its
individual segments are too large for the outgoing link.

Fixes: fe6cc55f3a ("net: ip, ipv6: handle gso skbs in forwarding path")
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Reported-by: Tobias Brunner <tobias@strongswan.org>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Florian Westphal
2014-04-09 10:28:50 +02:00
committed by Greg Kroah-Hartman
parent 6ea4dd539a
commit b8362bf431
1 changed files with 7 additions and 5 deletions
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12
net/core/skbuff.c
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@@ -3487,12 +3487,14 @@ EXPORT_SYMBOL(skb_try_coalesce);
unsigned int skb_gso_transport_seglen(const struct sk_buff *skb)
{
const struct skb_shared_info *shinfo = skb_shinfo(skb);
unsigned int hdr_len;
if (likely(shinfo->gso_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6)))
hdr_len = tcp_hdrlen(skb);
else
hdr_len = sizeof(struct udphdr);
return hdr_len + shinfo->gso_size;
return tcp_hdrlen(skb) + shinfo->gso_size;
/* UFO sets gso_size to the size of the fragmentation
* payload, i.e. the size of the L4 (UDP) header is already
* accounted for.
*/
return shinfo->gso_size;
}
EXPORT_SYMBOL_GPL(skb_gso_transport_seglen);