When checking incoming connections, also care about aliased interfaces.

Re #1206

This commit was SVN r17331.

ompi/mca/btl/tcp/btl_tcp_proc.c

@@ -329,31 +329,61 @@ bool mca_btl_tcp_proc_accept(mca_btl_tcp_proc_t* btl_proc, struct sockaddr* addr
     OPAL_THREAD_LOCK(&btl_proc->proc_lock);
     for( i = 0; i < btl_proc->proc_endpoint_count; i++ ) {
         mca_btl_base_endpoint_t* btl_endpoint = btl_proc->proc_endpoints[i];
+        uint16_t remote_kernel_index;
+        bool matched = false;
+        uint16_t j;
+
         /* Check all conditions before going to try to accept the connection. */
         if( btl_endpoint->endpoint_addr->addr_family != addr->sa_family ) {
             continue;
         }
 
+        /* Check for alias addresses: aliases share the same remote
+         * kernel_index, so if the addresses don't match, it can still be
+         * an alias of one we want to accept.
+         */
+        remote_kernel_index = btl_endpoint->endpoint_addr->addr_ifkindex;
+
+        for (j=0; j < btl_proc->proc_addr_count; j++) {
+            mca_btl_tcp_addr_t* exported_address = btl_proc->proc_addrs + j;
+
+            if (remote_kernel_index != exported_address->addr_ifkindex) {
+                /* kernel_index doesn't match, so that's not a possible
+                 * alias
+                 */
+                continue;
+            }
+
             switch (addr->sa_family) {
                 case AF_INET:
-            if( memcmp( &btl_endpoint->endpoint_addr->addr_inet,
+                    /* if (aliases) addresses match, accept it */
+                    if(!memcmp( &exported_address->addr_inet,
                                 &(((struct sockaddr_in*)addr)->sin_addr),
                                 sizeof(struct in_addr) ) ) {
-                continue;
+                        matched = true;
                     }
                     break;
 #if OPAL_WANT_IPV6
                 case AF_INET6:
-            if( memcmp( &btl_endpoint->endpoint_addr->addr_inet,
+                    if(!IN6_ARE_ADDR_EQUAL(
-                        &(((struct sockaddr_in6*)addr)->sin6_addr),
+                                &btl_endpoint->endpoint_addr->addr_inet,
-                        sizeof(struct in6_addr) ) ) {
+                                &(((struct sockaddr_in6*)addr)->sin6_addr))) {
-                continue;
+                        matched = true;
                     }
                     break;
 #endif
                 default:
                     ;
             }
+        }
+
+        /* do we have a match for the incoming address? Read: is there a
+         * btl_endpoint with an address configured for the same remote
+         * NIC? If not, check the next btl_endpoint
+         */
+        if (false == matched) {
+            continue;
+        }
 
         if(mca_btl_tcp_endpoint_accept(btl_endpoint, addr, sd)) {
             OPAL_THREAD_UNLOCK(&btl_proc->proc_lock);