Merge quagga mainline into the google ISIS code.

The steps were:

  $ git checkout google-is-is
  $ git merge quagga
  $ git checkout google-is-is -- isisd

  # Resolve conflicts in the following:
  lib/md5.h
  zebra/rt_netlink.c
  zebra/zebra_rib.c
  zebra/zserv.c

Note that the content in the isisd directory is left unchanged in the
merge. As a result, changes made to isisd as part of the following
commits on the quagga mainline are dropped.

  # 8ced4e82 is the merge base, e96b3121 is the current quagga master
  $ git log --oneline --reverse 8ced4e82..e96b3121 -- isisd
  5574999 isisd: fix crash on "no router isis" (BZ#536)
  8998075 isisd: raise hello rate for DIS (BZ#539)
  306ca83 isisd: include hash.h, not hash.c
  b82cdeb delete CVS keywords
  2f65867 isisd: indent longopts array
  b511468 quagga: option "-z" ("--socket <path>") added
  05e54ee build: delete .cvsignore files
  b4e45f6 fix zebra protocol after MP-BGP changes
  7fd6cd8 isisd: fix circuit state machine
  907fd95 isisd: send proper LSP after DIS election
  d034aa0 isisd: fix wrong next-hops from SPF
  c25eaff isisd: unexpected kernel routing table (BZ#544)
  e6b03b7 isisd: implement MD5 circuit authentication

1 files changed, 35 insertions, 12 deletions

diff --git a/lib/sockunion.c b/lib/sockunion.c
index a5382a72..59770529 100644
--- a/lib/sockunion.c
+++ b/lib/sockunion.c
@@ -297,27 +297,24 @@ sockunion_sizeof (union sockunion *su)
 }
 
 /* return sockunion structure : this function should be revised. */
-static char *
-sockunion_log (union sockunion *su)
+static const char *
+sockunion_log (union sockunion *su, char *buf, size_t len)
 {
-  static char buf[SU_ADDRSTRLEN];
-
   switch (su->sa.sa_family) 
     {
     case AF_INET:
-      snprintf (buf, SU_ADDRSTRLEN, "%s", inet_ntoa (su->sin.sin_addr));
-      break;
+      return inet_ntop(AF_INET, &su->sin.sin_addr, buf, len);
+
 #ifdef HAVE_IPV6
     case AF_INET6:
-      snprintf (buf, SU_ADDRSTRLEN, "%s",
-		inet_ntop (AF_INET6, &(su->sin6.sin6_addr), buf, SU_ADDRSTRLEN));
+      return inet_ntop(AF_INET6, &(su->sin6.sin6_addr), buf, len);
       break;
 #endif /* HAVE_IPV6 */
+
     default:
-      snprintf (buf, SU_ADDRSTRLEN, "af_unknown %d ", su->sa.sa_family);
-      break;
+      snprintf (buf, len, "af_unknown %d ", su->sa.sa_family);
+      return buf;
     }
-  return (XSTRDUP (MTYPE_TMP, buf));
 }
 
 /* sockunion_connect returns
@@ -379,8 +376,10 @@ sockunion_connect (int fd, union sockunion *peersu, unsigned short port,
     {
       if (errno != EINPROGRESS)
 	{
+	  char str[SU_ADDRSTRLEN];
 	  zlog_info ("can't connect to %s fd %d : %s",
-		     sockunion_log (&su), fd, safe_strerror (errno));
+		     sockunion_log (&su, str, sizeof str),
+		     fd, safe_strerror (errno));
 	  return connect_error;
 	}
     }
@@ -567,6 +566,30 @@ sockopt_minttl (int family, int sock, int minttl)
   return -1;
 }
 
+int
+sockopt_v6only (int family, int sock)
+{
+  int ret, on = 1;
+
+#ifdef HAVE_IPV6
+#ifdef IPV6_V6ONLY
+  if (family == AF_INET6)
+    {
+      ret = setsockopt (sock, IPPROTO_IPV6, IPV6_V6ONLY,
+			(void *) &on, sizeof (int));
+      if (ret < 0)
+	{
+	  zlog (NULL, LOG_WARNING, "can't set sockopt IPV6_V6ONLY "
+		    "to socket %d", sock);
+	  return -1;
+	}
+      return 0;
+    }
+#endif /* IPV6_V6ONLY */
+#endif /* HAVE_IPV6 */
+  return 0;
+}
+
 /* If same family and same prefix return 1. */
 int
 sockunion_same (union sockunion *su1, union sockunion *su2)