ipv[4|6]: correct dropwatch false positive in local_deliver_finish
authorNeil Horman <nhorman@tuxdriver.com>
Fri, 1 Mar 2013 07:44:08 +0000 (07:44 +0000)
committerDavid S. Miller <davem@davemloft.net>
Fri, 1 Mar 2013 20:56:29 +0000 (15:56 -0500)
commitd8c6f4b9b7848bca8babfc0ae43a50c8ab22fbb9
treec354b5edc7c4c335bea3d9dcf4e977646ed012a0
parent9e0aab86496295efdf6c2f57eaac3497e1c721a2
ipv[4|6]: correct dropwatch false positive in local_deliver_finish

I had a report recently of a user trying to use dropwatch to localise some frame
loss, and they were getting false positives.  Turned out they were using a user
space SCTP stack that used raw sockets to grab frames.  When we don't have a
registered protocol for a given packet, we record it as a drop, even if a raw
socket receieves the frame.  We should only record the drop in the event a raw
socket doesnt exist to receive the frames

Tested by the reported successfully

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Reported-by: William Reich <reich@ulticom.com>
Tested-by: William Reich <reich@ulticom.com>
CC: "David S. Miller" <davem@davemloft.net>
CC: William Reich <reich@ulticom.com>
CC: eric.dumazet@gmail.com
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/ipv4/ip_input.c
net/ipv6/ip6_input.c