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net: Discard and warn about LRO'd skbs received for forwarding

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Add skb_warn_if_lro() to test whether an skb was received with LRO and
warn if so.

Change br_forward(), ip_forward() and ip6_forward() to call it) and
discard the skb if it returns true.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ben Hutchings
2008-06-19 16:22:28 -07:00
committed by David S. Miller
parent 0187bdfb05
commit 4497b0763c
5 changed files with 29 additions and 1 deletions
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8
net/core/skbuff.c
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@@ -2583,6 +2583,13 @@ bool skb_partial_csum_set(struct sk_buff *skb, u16 start, u16 off)
return true;
}
void __skb_warn_lro_forwarding(const struct sk_buff *skb)
{
if (net_ratelimit())
pr_warning("%s: received packets cannot be forwarded"
" while LRO is enabled\n", skb->dev->name);
}
EXPORT_SYMBOL(___pskb_trim);
EXPORT_SYMBOL(__kfree_skb);
EXPORT_SYMBOL(kfree_skb);
@@ -2616,6 +2623,7 @@ EXPORT_SYMBOL(skb_seq_read);
EXPORT_SYMBOL(skb_abort_seq_read);
EXPORT_SYMBOL(skb_find_text);
EXPORT_SYMBOL(skb_append_datato_frags);
EXPORT_SYMBOL(__skb_warn_lro_forwarding);
EXPORT_SYMBOL_GPL(skb_to_sgvec);
EXPORT_SYMBOL_GPL(skb_cow_data);