diff options
| author | Daniel Borkmann <daniel@iogearbox.net> | 2015-11-11 23:25:40 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-01-22 20:34:46 -0800 |
| commit | 0fd58003ee7a7841646cdf01b0e4d30be1b3429f (patch) | |
| tree | 9ca28d1329716f8ffeafdfe37e1c0786c7aefabf /net | |
| parent | 4db32ea3a819bc70aef2084288461b951d5079e4 (diff) | |
| download | lwn-0fd58003ee7a7841646cdf01b0e4d30be1b3429f.tar.gz lwn-0fd58003ee7a7841646cdf01b0e4d30be1b3429f.zip | |
packet: do skb_probe_transport_header when we actually have data
[ Upstream commit efdfa2f7848f64517008136fb41f53c4a1faf93a ]
In tpacket_fill_skb() commit c1aad275b029 ("packet: set transport
header before doing xmit") and later on 40893fd0fd4e ("net: switch
to use skb_probe_transport_header()") was probing for a transport
header on the skb from a ring buffer slot, but at a time, where
the skb has _not even_ been filled with data yet. So that call into
the flow dissector is pretty useless. Lets do it after we've set
up the skb frags.
Fixes: c1aad275b029 ("packet: set transport header before doing xmit")
Reported-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/packet/af_packet.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index c53684eeddb3..b36cf006b054 100644 --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -2127,8 +2127,6 @@ static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb, skb_reserve(skb, hlen); skb_reset_network_header(skb); - if (!packet_use_direct_xmit(po)) - skb_probe_transport_header(skb, 0); if (unlikely(po->tp_tx_has_off)) { int off_min, off_max, off; off_min = po->tp_hdrlen - sizeof(struct sockaddr_ll); @@ -2212,6 +2210,9 @@ 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); + return tp_len; } |