gluster: IPv6 single stack support

Summary:
- This diff changes all locations in the code to prefer inet6 family
  instead of inet.  This will allow change GlusterFS to operate
  via IPv6 instead of IPv4 for all internal operations while still
  being able to serve (FUSE or NFS) clients via IPv4.
- The changes apply to NFS as well.
- This diff ports D1892990, D1897341 & D1896522 to the 3.8 branch.

Test Plan: Prove tests!

Reviewers: dph, rwareing

Signed-off-by: Shreyas Siravara <sshreyas@fb.com>

Change-Id: I34fdaaeb33c194782255625e00616faf75d60c33
BUG: 1406898
Reviewed-on-3.8-fb: http://review.gluster.org/16059
Reviewed-by: Shreyas Siravara <sshreyas@fb.com>
Tested-by: Shreyas Siravara <sshreyas@fb.com>

1 files changed, 88 insertions, 0 deletions

diff --git a/rpc/rpc-lib/src/rpcsvc.c b/rpc/rpc-lib/src/rpcsvc.c
index 68e27ab9e3f..82202dbb013 100644
--- a/rpc/rpc-lib/src/rpcsvc.c
+++ b/rpc/rpc-lib/src/rpcsvc.c
@@ -37,6 +37,10 @@
 #include <stdarg.h>
 #include <stdio.h>
 
+#ifdef IPV6_DEFAULT
+#include <netconfig.h>
+#endif
+
 #include "xdr-rpcclnt.h"
 #include "glusterfs-acl.h"
 
@@ -1402,6 +1406,82 @@ rpcsvc_error_reply (rpcsvc_request_t *req)
         return rpcsvc_submit_generic (req, &dummyvec, 0, NULL, 0, NULL);
 }
 
+#ifdef IPV6_DEFAULT
+int
+rpcsvc_program_register_rpcbind6 (rpcsvc_program_t *newprog, uint32_t port)
+{
+        const int IP_BUF_LEN = 64;
+        char addr_buf[IP_BUF_LEN];
+
+        int err = 0;
+        bool_t success = 0;
+        struct netconfig *nc;
+        struct netbuf *nb;
+
+        if (!newprog) {
+                goto out;
+        }
+
+        nc = getnetconfigent ("tcp6");
+        if (!nc) {
+                err = -1;
+                goto out;
+        }
+
+
+        err = sprintf (addr_buf, "::.%d.%d", port >> 8 & 0xff,
+                       port & 0xff);
+        if (err < 0) {
+                err = -1;
+                goto out;
+        }
+
+        nb = uaddr2taddr (nc, addr_buf);
+        if (!nb) {
+                err = -1;
+                goto out;
+        }
+
+        success = rpcb_set (newprog->prognum, newprog->progver, nc, nb);
+        if (!success) {
+                gf_log (GF_RPCSVC, GF_LOG_ERROR, "Could not register the IPv6"
+                                                 " service with rpcbind");
+        }
+
+        err = 0;
+
+out:
+        return err;
+}
+
+int
+rpcsvc_program_unregister_rpcbind6 (rpcsvc_program_t *newprog)
+{
+        int err = 0;
+        bool_t success = 0;
+        struct netconfig *nc;
+
+        if (!newprog) {
+                goto out;
+        }
+
+        nc = getnetconfigent ("tcp6");
+        if (!nc) {
+                err = -1;
+                goto out;
+        }
+
+        success = rpcb_unset (newprog->prognum, newprog->progver, nc);
+        if (!success) {
+                gf_log (GF_RPCSVC, GF_LOG_ERROR, "Could not unregister the IPv6"
+                                                 " service with rpcbind");
+        }
+
+        err = 0;
+out:
+        return err;
+}
+#endif
 
 /* Register the program with the local portmapper service. */
 int
@@ -1566,6 +1646,14 @@ rpcsvc_program_unregister (rpcsvc_t *svc, rpcsvc_program_t *program)
                         " program failed");
                 goto out;
         }
+#ifdef IPV6_DEFAULT
+        ret = rpcsvc_program_unregister_rpcbind6 (program);
+        if (ret == -1) {
+                gf_log (GF_RPCSVC, GF_LOG_ERROR, "rpcbind (ipv6)"
+                        " unregistration of program failed");
+                goto out;
+        }
+#endif
         pthread_mutex_lock (&svc->rpclock);
         {
                 list_for_each_entry (prog, &svc->programs, program) {