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skbuff: introduce skb_gso_validate_mtu

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skb_gso_network_seglen is not enough for checking fragment sizes if
skb is using GSO_BY_FRAGS as we have to check frag per frag.

This patch introduces skb_gso_validate_mtu, based on the former, which
will wrap the use case inside it as all calls to skb_gso_network_seglen
were to validate if it fits on a given TMU, and improve the check.

Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Tested-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Marcelo Ricardo Leitner
2016-06-02 15:05:41 -03:00
committed by David S. Miller
parent 3953c46c3a
commit ae7ef81ef0
6 changed files with 36 additions and 4 deletions
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2
net/ipv4/ip_forward.c
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@@ -54,7 +54,7 @@ static bool ip_exceeds_mtu(const struct sk_buff *skb, unsigned int mtu)
if (skb->ignore_df)
return false;
if (skb_is_gso(skb) && skb_gso_network_seglen(skb) <= mtu)
if (skb_is_gso(skb) && skb_gso_validate_mtu(skb, mtu))
return false;
return true;

2
net/ipv4/ip_output.c
View File

@@ -225,7 +225,7 @@ static int ip_finish_output_gso(struct net *net, struct sock *sk,
/* common case: locally created skb or seglen is <= mtu */
if (((IPCB(skb)->flags & IPSKB_FORWARDED) == 0) ||
skb_gso_network_seglen(skb) <= mtu)
skb_gso_validate_mtu(skb, mtu))
return ip_finish_output2(net, sk, skb);
/* Slowpath - GSO segment length is exceeding the dst MTU.