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| 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/ipv6 | |
| 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/ipv6')
| -rw-r--r-- | net/ipv6/ip6_offload.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/net/ipv6/ip6_offload.c b/net/ipv6/ip6_offload.c index 0ee8ef32320a..61ed9f99139f 100644 --- a/net/ipv6/ip6_offload.c +++ b/net/ipv6/ip6_offload.c @@ -118,6 +118,7 @@ static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, ipv6h = (struct ipv6hdr *)(skb_mac_header(skb) + nhoff); ipv6h->payload_len = htons(skb->len - nhoff - sizeof(*ipv6h)); skb->network_header = (u8 *)ipv6h - skb->head; + skb_reset_mac_len(skb); if (udpfrag) { int err = ip6_find_1stfragopt(skb, &prevhdr); |