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ipv6: Should use consistent conditional judgement for ip6 fragment between __ip6_append_data and ip6_finish_output 

There is an inconsistent conditional judgement between __ip6_append_data
and ip6_finish_output functions, the variable length in __ip6_append_data
just include the length of application's payload and udp6 header, don't
include the length of ipv6 header, but in ip6_finish_output use
(skb->len > ip6_skb_dst_mtu(skb)) as judgement, and skb->len include the
length of ipv6 header.

That causes some particular application's udp6 payloads whose length are
between (MTU - IPv6 Header) and MTU were fragmented by ip6_fragment even
though the rst->dev support UFO feature.

Add the length of ipv6 header to length in __ip6_append_data to keep
consistent conditional judgement as ip6_finish_output for ip6 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 2016-12-28 23:23:46 +08:00 committed by David S. Miller
parent 60133867f1
commit e4c5e13aa4
1 changed files with 1 additions and 1 deletions
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2
net/ipv6/ip6_output.c
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@ -1373,7 +1373,7 @@ static int __ip6_append_data(struct sock *sk,
*/
cork->length += length;
if (((length > mtu) ||
if ((((length + fragheaderlen) > mtu) ||
(skb && skb_is_gso(skb))) &&
(sk->sk_protocol == IPPROTO_UDP) &&
(rt->dst.dev->features & NETIF_F_UFO) && !rt->dst.header_len &&