rpc: define client port range

Problem:
when bind-insecure is 'off', all the clients bind to secure ports,
if incase all the secure ports exhaust the client will no more bind
to secure ports and tries gets a random port which is obviously insecure.

we have seen the client obtaining a port number in the range 49152-65535
which are actually reserved as part of glusterd's pmap_registry for bricks,
hence this will lead to port clashes between client and brick processes.

Solution:
If we can define different port ranges for clients incase where secure ports
exhaust, we can avoid the maximum port clashes with in gluster processes.

Still we are prone to have clashes with other non-gluster processes, but
the chances being very low, but that's a different story on its own,
which will be handled in upcoming patches.

Backportof:
> Change-Id: Ib5ce05991aa1290ccb17f6f04ffd65caf411feaf
> BUG: 1322805
> Signed-off-by: Prasanna Kumar Kalever <prasanna.kalever@redhat.com>
> Reviewed-on: http://review.gluster.org/13998
> Smoke: Gluster Build System <jenkins@build.gluster.com>
> NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
> CentOS-regression: Gluster Build System <jenkins@build.gluster.com>
> Reviewed-by: Atin Mukherjee <amukherj@redhat.com>
> Reviewed-by: Raghavendra G <rgowdapp@redhat.com>

Change-Id: I2ab9608ddbefcdf5987d817c23dd066010148e19
BUG: 1333711
Signed-off-by: Prasanna Kumar Kalever <prasanna.kalever@redhat.com>
Reviewed-on: http://review.gluster.org/14234
Tested-by: Prasanna Kumar Kalever <pkalever@redhat.com>
Smoke: Gluster Build System <jenkins@build.gluster.com>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Atin Mukherjee <amukherj@redhat.com>

4 files changed, 42 insertions, 4 deletions

diff --git a/libglusterfs/src/common-utils.h b/libglusterfs/src/common-utils.h
index edd198cadc0..b7d4845b138 100644
--- a/libglusterfs/src/common-utils.h
+++ b/libglusterfs/src/common-utils.h
@@ -82,7 +82,10 @@ void trap (void);
  * nfs port in volume status.
  */
 #define GF_NFS3_PORT    2049
+
 #define GF_CLIENT_PORT_CEILING 1024
+#define GF_IANA_PRIV_PORTS_START 49152 /* RFC 6335 */
+#define GF_CLNT_INSECURE_PORT_CEILING (GF_IANA_PRIV_PORTS_START - 1)
 #define GF_PORT_MAX 65535
 
 #define GF_MINUTE_IN_SECONDS 60
diff --git a/rpc/rpc-transport/rdma/src/name.c b/rpc/rpc-transport/rdma/src/name.c
index d4502e766bf..d5de6f8f5bc 100644
--- a/rpc/rpc-transport/rdma/src/name.c
+++ b/rpc/rpc-transport/rdma/src/name.c
@@ -57,10 +57,17 @@ af_inet_bind_to_port_lt_ceiling (struct rdma_cm_id *cm_id,
         int32_t        ret        = -1;
         uint16_t      port        = ceiling - 1;
         gf_boolean_t  ports[GF_PORT_MAX];
+        int           i           = 0;
 
+loop:
         ret = gf_process_reserved_ports (ports, ceiling);
 
         while (port) {
+                if (port == GF_CLIENT_PORT_CEILING) {
+                        ret = -1;
+                        break;
+                }
+
                 /* ignore the reserved ports */
                 if (ports[port] == _gf_true) {
                         port--;
@@ -80,6 +87,18 @@ af_inet_bind_to_port_lt_ceiling (struct rdma_cm_id *cm_id,
                 port--;
         }
 
+        /* Incase if all the secure ports are exhausted, we are no more
+         * binding to secure ports, hence instead of getting a random
+         * port, lets define the range to restrict it from getting from
+         * ports reserved for bricks i.e from range of 49152 - 65535
+         * which further may lead to port clash */
+        if (!port) {
+                ceiling = port = GF_CLNT_INSECURE_PORT_CEILING;
+                for (i = 0; i <= ceiling; i++)
+                        ports[i] = _gf_false;
+                goto loop;
+        }
+
         return ret;
 }
 
diff --git a/rpc/rpc-transport/socket/src/name.c b/rpc/rpc-transport/socket/src/name.c
index 12887a72ff1..79e1dfde778 100644
--- a/rpc/rpc-transport/socket/src/name.c
+++ b/rpc/rpc-transport/socket/src/name.c
@@ -45,11 +45,17 @@ af_inet_bind_to_port_lt_ceiling (int fd, struct sockaddr *sockaddr,
         int32_t        ret        = -1;
         uint16_t      port        = ceiling - 1;
         gf_boolean_t  ports[GF_PORT_MAX];
+        int           i           = 0;
 
+loop:
         ret = gf_process_reserved_ports (ports, ceiling);
 
-        while (port)
-        {
+        while (port) {
+                if (port == GF_CLIENT_PORT_CEILING) {
+                        ret = -1;
+                        break;
+                }
+
                 /* ignore the reserved ports */
                 if (ports[port] == _gf_true) {
                         port--;
@@ -69,6 +75,18 @@ af_inet_bind_to_port_lt_ceiling (int fd, struct sockaddr *sockaddr,
                 port--;
         }
 
+        /* Incase if all the secure ports are exhausted, we are no more
+         * binding to secure ports, hence instead of getting a random
+         * port, lets define the range to restrict it from getting from
+         * ports reserved for bricks i.e from range of 49152 - 65535
+         * which further may lead to port clash */
+        if (!port) {
+                ceiling = port = GF_CLNT_INSECURE_PORT_CEILING;
+                for (i = 0; i <= ceiling; i++)
+                        ports[i] = _gf_false;
+                goto loop;
+        }
+
         return ret;
 }
 
diff --git a/xlators/mgmt/glusterd/src/glusterd-pmap.h b/xlators/mgmt/glusterd/src/glusterd-pmap.h
index dc80c41c35b..95ded04208d 100644
--- a/xlators/mgmt/glusterd/src/glusterd-pmap.h
+++ b/xlators/mgmt/glusterd/src/glusterd-pmap.h
@@ -23,8 +23,6 @@
 #include "rpcsvc.h"
 
 
-#define GF_IANA_PRIV_PORTS_START 49152 /* RFC 6335 */
-
 struct pmap_port_status {
         gf_pmap_port_type_t type;
         char  *brickname;