From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eric Dumazet Subject: [PATCH net-next] tcp: md5: add LINUX_MIB_TCPMD5FAILURE counter Date: Wed, 24 Aug 2016 09:01:23 -0700 Message-ID: <1472054483.14381.86.camel@edumazet-glaptop3.roam.corp.google.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Cc: netdev , Neal Cardwell , Yuchung Cheng , Julien Goodwin , Eric Dumazet To: David Miller Return-path: Received: from mail-pf0-f196.google.com ([209.85.192.196]:36573 "EHLO mail-pf0-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756561AbcHXQPY (ORCPT ); Wed, 24 Aug 2016 12:15:24 -0400 Received: by mail-pf0-f196.google.com with SMTP id y134so1475993pfg.3 for ; Wed, 24 Aug 2016 09:15:23 -0700 (PDT) Sender: netdev-owner@vger.kernel.org List-ID: From: Eric Dumazet Adds SNMP counter for drops caused by MD5 mismatches. The current syslog might help, but a counter is more precise and helps monitoring. Signed-off-by: Eric Dumazet --- include/uapi/linux/snmp.h | 1 + net/ipv4/proc.c | 1 + net/ipv4/tcp_ipv4.c | 1 + net/ipv6/tcp_ipv6.c | 1 + 4 files changed, 4 insertions(+) diff --git a/include/uapi/linux/snmp.h b/include/uapi/linux/snmp.h index 25a9ad8bcef1240915f2553a8acade447186d869..e7a31f8306903f53bc5881ae4c271f85cad2e361 100644 --- a/include/uapi/linux/snmp.h +++ b/include/uapi/linux/snmp.h @@ -235,6 +235,7 @@ enum LINUX_MIB_TCPSPURIOUSRTOS, /* TCPSpuriousRTOs */ LINUX_MIB_TCPMD5NOTFOUND, /* TCPMD5NotFound */ LINUX_MIB_TCPMD5UNEXPECTED, /* TCPMD5Unexpected */ + LINUX_MIB_TCPMD5FAILURE, /* TCPMD5Failure */ LINUX_MIB_SACKSHIFTED, LINUX_MIB_SACKMERGED, LINUX_MIB_SACKSHIFTFALLBACK, diff --git a/net/ipv4/proc.c b/net/ipv4/proc.c index 9f665b63a927202b9aaf2b6b3d42205058a2ae59..1ed015e4bc792acdd520a5df95ffac33ebefc4db 100644 --- a/net/ipv4/proc.c +++ b/net/ipv4/proc.c @@ -257,6 +257,7 @@ static const struct snmp_mib snmp4_net_list[] = { SNMP_MIB_ITEM("TCPSpuriousRTOs", LINUX_MIB_TCPSPURIOUSRTOS), SNMP_MIB_ITEM("TCPMD5NotFound", LINUX_MIB_TCPMD5NOTFOUND), SNMP_MIB_ITEM("TCPMD5Unexpected", LINUX_MIB_TCPMD5UNEXPECTED), + SNMP_MIB_ITEM("TCPMD5Failure", LINUX_MIB_TCPMD5FAILURE), SNMP_MIB_ITEM("TCPSackShifted", LINUX_MIB_SACKSHIFTED), SNMP_MIB_ITEM("TCPSackMerged", LINUX_MIB_SACKMERGED), SNMP_MIB_ITEM("TCPSackShiftFallback", LINUX_MIB_SACKSHIFTFALLBACK), diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index 32b048e524d6773538918eca175b3f422f9c2aa7..45aac7ada13592c6f1c9f28aea4426b40520e0c8 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -1169,6 +1169,7 @@ static bool tcp_v4_inbound_md5_hash(const struct sock *sk, NULL, skb); if (genhash || memcmp(hash_location, newhash, 16) != 0) { + NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5FAILURE); net_info_ratelimited("MD5 Hash failed for (%pI4, %d)->(%pI4, %d)%s\n", &iph->saddr, ntohs(th->source), &iph->daddr, ntohs(th->dest), diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c index e0f46439e391f2a8b2fac2e13b6f61a11c082715..60a65d058349c93fb66275434f6fe162a621782e 100644 --- a/net/ipv6/tcp_ipv6.c +++ b/net/ipv6/tcp_ipv6.c @@ -671,6 +671,7 @@ static bool tcp_v6_inbound_md5_hash(const struct sock *sk, NULL, skb); if (genhash || memcmp(hash_location, newhash, 16) != 0) { + NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5FAILURE); net_info_ratelimited("MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n", genhash ? "failed" : "mismatch", &ip6h->saddr, ntohs(th->source),