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[PATCH] icmp: Fixed bug in raw sockets causing incorrect ICMP SNMP counter values

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Sending ICMP packets with raw sockets ends up in the SNMP counters
logging the type as the first byte of the IPv4 header rather than
the ICMP header (in nearly all cases this is seen as "OutType69".
This is fixed by adding the IP Header Length to the casting into
a icmphdr struct.

Signed-off-by: Ben Cartwright-Cox <ben@benjojo.co.uk>
---
 net/ipv4/raw.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index 561cd4b..1ad8bae 100644
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c
@@ -409,7 +409,7 @@ static int raw_send_hdrinc(struct sock *sk, struct flowi4 *fl4,
 	}
 	if (iph->protocol == IPPROTO_ICMP)
 		icmp_out_count(net, ((struct icmphdr *)
-			skb_transport_header(skb))->type);
+			skb_transport_header(skb) + iphlen)->type);
 
 	err = NF_HOOK(NFPROTO_IPV4, NF_INET_LOCAL_OUT, sk, skb,
 		      NULL, rt->dst.dev, dst_output_sk);
-- 
1.9.1

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[PATCH] icmp: Fixed bug in raw sockets causing incorrect ICMP SNMP  counter values Ben Cartwright-Cox <ben@benjojo.co.uk> - 2015-10-11 23:40 +0200
  Re: [PATCH] icmp: Fixed bug in raw sockets causing incorrect ICMP  SNMP counter values Eric Dumazet <eric.dumazet@gmail.com> - 2015-10-12 00:20 +0200
    Re: [PATCH] icmp: Fixed bug in raw sockets causing incorrect ICMP  SNMP counter values Ben Cox <ben@benjojo.co.uk> - 2015-10-12 00:20 +0200
      Re: [PATCH] icmp: Fixed bug in raw sockets causing incorrect ICMP  SNMP counter values Eric Dumazet <eric.dumazet@gmail.com> - 2015-10-12 00:50 +0200
        Re: [PATCH] icmp: Fixed bug in raw sockets causing incorrect ICMP  SNMP counter values Eric Dumazet <eric.dumazet@gmail.com> - 2015-10-12 00:50 +0200
          Re: [PATCH] icmp: Fixed bug in raw sockets causing incorrect ICMP  SNMP counter values Eric Dumazet <eric.dumazet@gmail.com> - 2015-10-12 01:20 +0200
            Re: [PATCH] icmp: Fixed bug in raw sockets causing incorrect ICMP  SNMP counter values Ben Cox <ben@benjojo.co.uk> - 2015-10-12 01:20 +0200
              Re: [PATCH] icmp: Fixed bug in raw sockets causing incorrect ICMP  SNMP counter values Eric Dumazet <eric.dumazet@gmail.com> - 2015-10-12 01:40 +0200

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