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net: core: handle encapsulation offloads when computing segment lengths 

if ->encapsulation is set we have to use inner_tcp_hdrlen and add the
size of the inner network headers too.

This is 'mostly harmless'; tbf might send skb that is slightly over
quota or drop skb even if it would have fit.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Westphal 2014-10-20 13:49:18 +02:00 committed by David S. Miller
parent 330966e501
commit f993bc25e5
1 changed files with 10 additions and 3 deletions
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13
net/core/skbuff.c
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@ -4070,15 +4070,22 @@ EXPORT_SYMBOL_GPL(skb_scrub_packet);
unsigned int skb_gso_transport_seglen(const struct sk_buff *skb)
{
const struct skb_shared_info *shinfo = skb_shinfo(skb);
unsigned int thlen = 0;
if (likely(shinfo->gso_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6)))
return tcp_hdrlen(skb) + shinfo->gso_size;
if (skb->encapsulation) {
thlen = skb_inner_transport_header(skb) -
skb_transport_header(skb);
if (likely(shinfo->gso_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6)))
thlen += inner_tcp_hdrlen(skb);
} else if (likely(shinfo->gso_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6))) {
thlen = tcp_hdrlen(skb);
}
/* 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;
return thlen + shinfo->gso_size;
}
EXPORT_SYMBOL_GPL(skb_gso_transport_seglen);