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gro: Fix frag_list merging on imprecisely split packets 

The previous fix ad0f990444 (gro:
Fix handling of imprecisely split packets) only fixed the case
of frags merging, frag_list merging in the same circumstances
were still broken.

In particular, the packet headers end up in the data stream.

This patch fixes this plus another issue where an imprecisely
split packet header may be read incorrectly (this is mostly
harmless since it'll simply cause the packet to not match and
be rejected for GRO).

Thanks to Emil Tantilov and Jeff Kirsher for helping to track
this down.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2009-02-05 21:26:52 -08:00 committed by David S. Miller
parent fe2918b098
commit 56035022d8
2 changed files with 13 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
net/core/dev.c
View File

@ -2391,7 +2391,8 @@ void *skb_gro_header(struct sk_buff *skb, unsigned int hlen)
return pskb_may_pull(skb, hlen) ? skb->data + offset : NULL;
return page_address(skb_shinfo(skb)->frags[0].page) +
skb_shinfo(skb)->frags[0].page_offset + offset;
skb_shinfo(skb)->frags[0].page_offset +
offset - skb_headlen(skb);
}
EXPORT_SYMBOL(skb_gro_header);

11
net/core/skbuff.c
View File

@ -2678,6 +2678,17 @@ int skb_gro_receive(struct sk_buff **head, struct sk_buff *skb)
p = nskb;
merge:
if (skb_gro_offset(skb) > skb_headlen(skb)) {
skb_shinfo(skb)->frags[0].page_offset +=
skb_gro_offset(skb) - skb_headlen(skb);
skb_shinfo(skb)->frags[0].size -=
skb_gro_offset(skb) - skb_headlen(skb);
skb_gro_reset_offset(skb);
skb_gro_pull(skb, skb_headlen(skb));
}
__skb_pull(skb, skb_gro_offset(skb));
p->prev->next = skb;
p->prev = skb;
skb_header_release(skb);