[src/trunk]: src/sys/netinet Print the IPv6 or IPv4 source addresses of packe...

[is <is%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/ef3a39d43c97
branches:  trunk
changeset: 346629:ef3a39d43c97
user:      is <is%NetBSD.org@localhost>
date:      Sat Jul 23 13:37:10 2016 +0000

description:
Print the IPv6 or IPv4 source addresses of packets with wrong hash, to
help debugging.

diffstat:

 sys/netinet/ip_carp.c |  27 ++++++++++++++++++++++++---
 1 files changed, 24 insertions(+), 3 deletions(-)

diffs (57 lines):

diff -r ba62ff17f85c -r ef3a39d43c97 sys/netinet/ip_carp.c
--- a/sys/netinet/ip_carp.c     Sat Jul 23 12:19:07 2016 +0000
+++ b/sys/netinet/ip_carp.c     Sat Jul 23 13:37:10 2016 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: ip_carp.c,v 1.75 2016/07/23 12:19:07 is Exp $  */
+/*     $NetBSD: ip_carp.c,v 1.76 2016/07/23 13:37:10 is Exp $  */
 /*     $OpenBSD: ip_carp.c,v 1.113 2005/11/04 08:11:54 mcbride Exp $   */
 
 /*
@@ -33,7 +33,7 @@
 #endif
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: ip_carp.c,v 1.75 2016/07/23 12:19:07 is Exp $");
+__KERNEL_RCSID(0, "$NetBSD: ip_carp.c,v 1.76 2016/07/23 13:37:10 is Exp $");
 
 /*
  * TODO:
@@ -94,6 +94,7 @@
 #include <netinet6/ip6_var.h>
 #include <netinet6/nd6.h>
 #include <netinet6/scope6_var.h>
+#include <netinet6/in6_var.h>
 #endif
 
 #include <net/bpf.h>
@@ -682,9 +683,29 @@
 
        /* verify the hash */
        if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) {
+               struct ip *ip;
+               struct ip6_hdr *ip6;
+
                CARP_STATINC(CARP_STAT_BADAUTH);
                sc->sc_if.if_ierrors++;
-               CARP_LOG(sc, ("incorrect hash"));
+
+               switch(af) {
+               
+               case AF_INET:
+                       ip = mtod(m, struct ip *);
+                       CARP_LOG(sc, ("incorrect hash from %s", 
+                           in_fmtaddr(ip->ip_src)));
+                       break;
+
+               case AF_INET6:
+                       ip6 = mtod(m, struct ip6_hdr *);
+                       CARP_LOG(sc, ("incorrect hash from %s",
+                               ip6_sprintf(&ip6->ip6_src)));
+                       break;
+
+               default: CARP_LOG(sc, ("incorrect hash"));
+                       break;
+               }
                m_freem(m);
                return;
        }