[PATCH v2 net] raw: increment correct SNMP counters for ICMP messages
From: Ben Cartwright-Cox <hidden>
Date: 2015-11-14 15:14:01
Also in:
lkml
Subsystem:
networking [general], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
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. This is fixed by adding the IP Header Length to the casting into a icmphdr struct. Signed-off-by: Ben Cartwright-Cox <redacted> Acked-by: Eric Dumazet <redacted> --- net/ipv4/raw.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index 561cd4b..ef3c9ba 100644
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c@@ -406,10 +406,12 @@ static int raw_send_hdrinc(struct sock *sk, struct flowi4 *fl4, ip_select_ident(net, skb, NULL); iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); + skb->transport_header += iphlen; + if (iph->protocol == IPPROTO_ICMP && + length >= iphlen + sizeof(struct icmphdr)) + icmp_out_count(net, ((struct icmphdr *) + skb_transport_header(skb))->type); } - if (iph->protocol == IPPROTO_ICMP) - icmp_out_count(net, ((struct icmphdr *) - skb_transport_header(skb))->type); err = NF_HOOK(NFPROTO_IPV4, NF_INET_LOCAL_OUT, sk, skb, NULL, rt->dst.dev, dst_output_sk);
--
1.9.1