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packet: always probe for transport header 

We concluded that the skb_probe_transport_header() should better be
called unconditionally. Avoiding the call into the flow dissector has
also not really much to do with the direct xmit mode.

While it seems that only virtio_net code makes use of GSO from non
RX/TX ring packet socket paths, we should probe for a transport header
nevertheless before they hit devices.

Reference: http://thread.gmane.org/gmane.linux.network/386173/
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Borkmann 2015-11-11 23:25:41 +01:00 committed by David S. Miller
parent efdfa2f784
commit 8fd6c80d9d
1 changed files with 3 additions and 4 deletions
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7
net/packet/af_packet.c
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@ -2447,8 +2447,7 @@ static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
len = ((to_write > len_max) ? len_max : to_write);
}
if (!packet_use_direct_xmit(po))
skb_probe_transport_header(skb, 0);
skb_probe_transport_header(skb, 0);
return tp_len;
}
@ -2808,8 +2807,8 @@ static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len)
len += vnet_hdr_len;
}
if (!packet_use_direct_xmit(po))
skb_probe_transport_header(skb, reserve);
skb_probe_transport_header(skb, reserve);
if (unlikely(extra_len == 4))
skb->no_fcs = 1;