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ipv4: Should use consistent conditional judgement for ip fragment in __ip_append_data and ip_finish_output 

There is an inconsistent conditional judgement in __ip_append_data and
ip_finish_output functions, the variable length in __ip_append_data just
include the length of application's payload and udp header, don't include
the length of ip header, but in ip_finish_output use
(skb->len > ip_skb_dst_mtu(skb)) as judgement, and skb->len include the
length of ip header.

That causes some particular application's udp payload whose length is
between (MTU - IP Header) and MTU were fragmented by ip_fragment even
though the rst->dev support UFO feature.

Add the length of ip header to length in __ip_append_data to keep
consistent conditional judgement as ip_finish_output for ip fragment.

Signed-off-by: Zheng Li <james.z.li@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
zheng li 2016-12-12 09:56:05 +08:00 committed by David S. Miller
parent ad688cdbb0
commit 0a28cfd51e
1 changed files with 1 additions and 1 deletions
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2
net/ipv4/ip_output.c
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@ -958,7 +958,7 @@ static int __ip_append_data(struct sock *sk,
csummode = CHECKSUM_PARTIAL; csummode = CHECKSUM_PARTIAL;
cork->length += length; cork->length += length;
if (((length > mtu) || (skb && skb_is_gso(skb))) && if ((((length + fragheaderlen) > mtu) || (skb && skb_is_gso(skb))) &&
(sk->sk_protocol == IPPROTO_UDP) && (sk->sk_protocol == IPPROTO_UDP) &&
(rt->dst.dev->features & NETIF_F_UFO) && !rt->dst.header_len && (rt->dst.dev->features & NETIF_F_UFO) && !rt->dst.header_len &&
(sk->sk_type == SOCK_DGRAM) && !sk->sk_no_check_tx) { (sk->sk_type == SOCK_DGRAM) && !sk->sk_no_check_tx) {