diff options
| author | Toke Høiland-Jørgensen <toke@toke.dk> | 2018-09-13 17:43:07 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-10-13 10:09:23 +0300 |
| commit | 0aced03a0e2527b92241b3cc4994458759d021c0 (patch) | |
| tree | 8afff7789ee8b691deb16e72395c1ed49353a779 /net/ipv4 | |
| parent | b4570618fa02bcd9eec7d249c22f16ed503f8ec6 (diff) | |
| download | linux-0aced03a0e2527b92241b3cc4994458759d021c0.tar.xz | |
gso_segment: Reset skb->mac_len after modifying network header
[ Upstream commit c56cae23c6b167acc68043c683c4573b80cbcc2c ]
When splitting a GSO segment that consists of encapsulated packets, the
skb->mac_len of the segments can end up being set wrong, causing packet
drops in particular when using act_mirred and ifb interfaces in
combination with a qdisc that splits GSO packets.
This happens because at the time skb_segment() is called, network_header
will point to the inner header, throwing off the calculation in
skb_reset_mac_len(). The network_header is subsequently adjust by the
outer IP gso_segment handlers, but they don't set the mac_len.
Fix this by adding skb_reset_mac_len() calls to both the IPv4 and IPv6
gso_segment handlers, after they modify the network_header.
Many thanks to Eric Dumazet for his help in identifying the cause of
the bug.
Acked-by: Dave Taht <dave.taht@gmail.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Toke Høiland-Jørgensen <toke@toke.dk>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/af_inet.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c index d2f8184fc8f4..08f73e0207dd 100644 --- a/net/ipv4/af_inet.c +++ b/net/ipv4/af_inet.c @@ -1288,6 +1288,7 @@ static struct sk_buff *inet_gso_segment(struct sk_buff *skb, if (encap) skb_reset_inner_headers(skb); skb->network_header = (u8 *)iph - skb->head; + skb_reset_mac_len(skb); } while ((skb = skb->next)); out: |