diff options
| author | Neil Horman <nhorman@tuxdriver.com> | 2013-03-01 07:44:08 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-03-01 15:56:29 -0500 |
| commit | d8c6f4b9b7848bca8babfc0ae43a50c8ab22fbb9 (patch) | |
| tree | c354b5edc7c4c335bea3d9dcf4e977646ed012a0 | |
| parent | 9e0aab86496295efdf6c2f57eaac3497e1c721a2 (diff) | |
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>
| -rw-r--r-- | net/ipv4/ip_input.c | 6 | ||||
| -rw-r--r-- | net/ipv6/ip6_input.c | 6 |
2 files changed, 8 insertions, 4 deletions
diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c index 87abd3e2bd3..2bdf802e28e 100644 --- a/net/ipv4/ip_input.c +++ b/net/ipv4/ip_input.c @@ -228,9 +228,11 @@ static int ip_local_deliver_finish(struct sk_buff *skb) icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PROT_UNREACH, 0); } - } else + kfree_skb(skb); + } else { IP_INC_STATS_BH(net, IPSTATS_MIB_INDELIVERS); - kfree_skb(skb); + consume_skb(skb); + } } } out: diff --git a/net/ipv6/ip6_input.c b/net/ipv6/ip6_input.c index 5b10414e619..b1876e52091 100644 --- a/net/ipv6/ip6_input.c +++ b/net/ipv6/ip6_input.c @@ -241,9 +241,11 @@ resubmit: icmpv6_send(skb, ICMPV6_PARAMPROB, ICMPV6_UNK_NEXTHDR, nhoff); } - } else + kfree_skb(skb); + } else { IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INDELIVERS); - kfree_skb(skb); + consume_skb(skb); + } } rcu_read_unlock(); return 0; |