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authorDaniel Borkmann <daniel@iogearbox.net>2015-11-11 23:25:40 +0100
committerDavid S. Miller <davem@davemloft.net>2015-11-15 18:00:35 -0500
commitefdfa2f7848f64517008136fb41f53c4a1faf93a (patch)
tree98233d2dcaba736b5362b21cac3e40695715fe47
parentd7475de58575c904818efa369c82e88c6648ce2e (diff)
packet: do skb_probe_transport_header when we actually have data
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>
-rw-r--r--net/packet/af_packet.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index af399cac5205..80c36c0867d3 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -2368,8 +2368,6 @@ 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);
@@ -2449,6 +2447,9 @@ 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;
}