This is a note to let you know that I've just added the patch titled
packet: do skb_probe_transport_header when we actually have data
to the 4.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
packet-do-skb_probe_transport_header-when-we-actually-have-data.patch
and it can be found in the queue-4.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From foo@baz Fri Dec 11 11:39:13 EST 2015
From: Daniel Borkmann <[email protected]>
Date: Wed, 11 Nov 2015 23:25:40 +0100
Subject: packet: do skb_probe_transport_header when we actually have data
From: Daniel Borkmann <[email protected]>
[ 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 <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
Acked-by: Jason Wang <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
net/packet/af_packet.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -2151,8 +2151,6 @@ static int tpacket_fill_skb(struct packe
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);
@@ -2232,6 +2230,9 @@ static int tpacket_fill_skb(struct packe
len = ((to_write > len_max) ? len_max : to_write);
}
+ if (!packet_use_direct_xmit(po))
+ skb_probe_transport_header(skb, 0);
+
return tp_len;
}
Patches currently in stable-queue which might be from [email protected] are
queue-4.1/packet-infer-protocol-from-ethernet-header-if-unset.patch
queue-4.1/bpf-array-fix-heap-out-of-bounds-access-when-updating-elements.patch
queue-4.1/ipv6-sctp-implement-sctp_v6_destroy_sock.patch
queue-4.1/packet-only-allow-extra-vlan-len-on-ethernet-devices.patch
queue-4.1/net-scm-fix-pax-detected-msg_controllen-overflow-in-scm_detach_fds.patch
queue-4.1/packet-fix-tpacket_snd-max-frame-len.patch
queue-4.1/packet-always-probe-for-transport-header.patch
queue-4.1/packet-do-skb_probe_transport_header-when-we-actually-have-data.patch
queue-4.1/tools-net-use-include-uapi-with-__exported_headers__.patch
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