diff options
author | zheng li <james.z.li@ericsson.com> | 2016-12-12 09:56:05 +0800 |
---|---|---|
committer | Sasha Levin <alexander.levin@verizon.com> | 2017-09-10 16:36:08 -0400 |
commit | 24fd79571a01bbfd7716bac228974a1f4944f48e (patch) | |
tree | 7ced5c87608c70ad753708cf3cfabb97ca8918b1 | |
parent | a9f545181d53bc636d64bdbfcf1cee6a699d6f08 (diff) |
ipv4: Should use consistent conditional judgement for ip fragment in __ip_append_data and ip_finish_output
[ Upstream commit 0a28cfd51e17f4f0a056bcf66bfbe492c3b99f38 ]
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>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
-rw-r--r-- | net/ipv4/ip_output.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c index 51573f8a39bc..adbb28b39413 100644 --- a/net/ipv4/ip_output.c +++ b/net/ipv4/ip_output.c @@ -891,7 +891,7 @@ static int __ip_append_data(struct sock *sk, csummode = CHECKSUM_PARTIAL; 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) && (rt->dst.dev->features & NETIF_F_UFO) && !rt->dst.header_len && (sk->sk_type == SOCK_DGRAM) && !sk->sk_no_check_tx) { |