1 files changed, 41 insertions, 6 deletions

diff --git a/net/tipc/server.c b/net/tipc/server.c
index eadd4ed45905..ab6183cdb121 100644
--- a/net/tipc/server.c
+++ b/net/tipc/server.c
@@ -37,11 +37,13 @@
 #include "core.h"
 #include "socket.h"
 #include <net/sock.h>
+#include <linux/module.h>
 
 /* Number of messages to send before rescheduling */
 #define MAX_SEND_MSG_COUNT      25
 #define MAX_RECV_MSG_COUNT      25
 #define CF_CONNECTED            1
+#define CF_SERVER               2
 
 #define sock2con(x) ((struct tipc_conn *)(x)->sk_user_data)
 
@@ -88,9 +90,19 @@ static void tipc_clean_outqueues(struct tipc_conn *con);
 static void tipc_conn_kref_release(struct kref *kref)
 {
         struct tipc_conn *con = container_of(kref, struct tipc_conn, kref);
+        struct sockaddr_tipc *saddr = con->server->saddr;
+        struct socket *sock = con->sock;
+        struct sock *sk;
 
-        if (con->sock) {
-                tipc_sock_release_local(con->sock);
+        if (sock) {
+                sk = sock->sk;
+                if (test_bit(CF_SERVER, &con->flags)) {
+                        __module_get(sock->ops->owner);
+                        __module_get(sk->sk_prot_creator->owner);
+                }
+                saddr->scope = -TIPC_NODE_SCOPE;
+                kernel_bind(sock, (struct sockaddr *)saddr, sizeof(*saddr));
+                sk_release_kernel(sk);
                 con->sock = NULL;
         }
 
@@ -281,7 +293,7 @@ static int tipc_accept_from_sock(struct tipc_conn *con)
         struct tipc_conn *newcon;
         int ret;
 
-        ret = tipc_sock_accept_local(sock, &newsock, O_NONBLOCK);
+        ret = kernel_accept(sock, &newsock, O_NONBLOCK);
         if (ret < 0)
                 return ret;
 
@@ -309,9 +321,12 @@ static struct socket *tipc_create_listen_sock(struct tipc_conn *con)
         struct socket *sock = NULL;
         int ret;
 
-        ret = tipc_sock_create_local(s->net, s->type, &sock);
+        ret = sock_create_kern(AF_TIPC, SOCK_SEQPACKET, 0, &sock);
         if (ret < 0)
                 return NULL;
+
+        sk_change_net(sock->sk, s->net);
+
         ret = kernel_setsockopt(sock, SOL_TIPC, TIPC_IMPORTANCE,
                                 (char *)&s->imp, sizeof(s->imp));
         if (ret < 0)
@@ -337,11 +352,31 @@ static struct socket *tipc_create_listen_sock(struct tipc_conn *con)
                 pr_err("Unknown socket type %d\n", s->type);
                 goto create_err;
         }
+
+        /* As server's listening socket owner and creator is the same module,
+         * we have to decrease TIPC module reference count to guarantee that
+         * it remains zero after the server socket is created, otherwise,
+         * executing "rmmod" command is unable to make TIPC module deleted
+         * after TIPC module is inserted successfully.
+         *
+         * However, the reference count is ever increased twice in
+         * sock_create_kern(): one is to increase the reference count of owner
+         * of TIPC socket's proto_ops struct; another is to increment the
+         * reference count of owner of TIPC proto struct. Therefore, we must
+         * decrement the module reference count twice to ensure that it keeps
+         * zero after server's listening socket is created. Of course, we
+         * must bump the module reference count twice as well before the socket
+         * is closed.
+         */
+        module_put(sock->ops->owner);
+        module_put(sock->sk->sk_prot_creator->owner);
+        set_bit(CF_SERVER, &con->flags);
+
         return sock;
 
 create_err:
-        sock_release(sock);
-        con->sock = NULL;
+        kernel_sock_shutdown(sock, SHUT_RDWR);
+        sk_release_kernel(sock->sk);
         return NULL;
 }