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, 9 insertions, 5 deletions

diff --git a/lib/zclient.h b/lib/zclient.h
index 21786ab8..a7d7b548 100644
--- a/lib/zclient.h
+++ b/lib/zclient.h
@@ -22,6 +22,9 @@
 #ifndef _ZEBRA_ZCLIENT_H
 #define _ZEBRA_ZCLIENT_H
 
+/* For struct zapi_ipv{4,6}. */
+#include "prefix.h"
+
 /* For struct interface and struct connected. */
 #include "if.h"
 
@@ -108,6 +111,8 @@ struct zapi_ipv4
 
   u_char message;
 
+  safi_t safi;
+
   u_char nexthop_num;
   struct in_addr **nexthop;
 
@@ -127,11 +132,8 @@ extern void zclient_stop (struct zclient *);
 extern void zclient_reset (struct zclient *);
 extern void zclient_free (struct zclient *);
 
-/* Get TCP socket connection to zebra daemon at loopback address. */
-extern int zclient_socket (void);
-
-/* Get unix stream socket connection to zebra daemon at given path. */
-extern int zclient_socket_un (const char *);
+extern int  zclient_socket_connect (struct zclient *);
+extern void zclient_serv_path_set  (char *path);
 
 /* Send redistribute command to zebra daemon. Do not update zclient state. */
 extern int zebra_redistribute_send (int command, struct zclient *, int type);
@@ -168,6 +170,8 @@ struct zapi_ipv6
 
   u_char message;
 
+  safi_t safi;
+
   u_char nexthop_num;
   struct in6_addr **nexthop;