• zheng li's avatar
    ipv4: Should use consistent conditional judgement for ip fragment in... · 24fd7957
    zheng li authored
    ipv4: Should use consistent conditional judgement for ip fragment in __ip_append_data and ip_finish_output
    
    [ Upstream commit 0a28cfd5 ]
    
    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: default avatarZheng Li <james.z.li@ericsson.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    Signed-off-by: default avatarSasha Levin <alexander.levin@verizon.com>
    24fd7957
ip_output.c 38.9 KB