Commit efdfa2f7 authored by Daniel Borkmann's avatar Daniel Borkmann Committed by David S. Miller

packet: do skb_probe_transport_header when we actually have data

In tpacket_fill_skb() commit c1aad275 ("packet: set transport
header before doing xmit") and later on 40893fd0 ("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: c1aad275 ("packet: set transport header before doing xmit")
Reported-by: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
Acked-by: default avatarJason Wang <jasowang@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent d7475de5
......@@ -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;
}
......
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