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-rw-r--r--net/tipc/socket.c99
1 files changed, 92 insertions, 7 deletions
diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index d5fa708f..bd8e2cd 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -2,7 +2,7 @@
* net/tipc/socket.c: TIPC socket API
*
* Copyright (c) 2001-2007, 2012 Ericsson AB
- * Copyright (c) 2004-2008, 2010-2012, Wind River Systems
+ * Copyright (c) 2004-2008, 2010-2013, Wind River Systems
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@@ -63,12 +63,15 @@ static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf);
static void wakeupdispatch(struct tipc_port *tport);
static void tipc_data_ready(struct sock *sk, int len);
static void tipc_write_space(struct sock *sk);
+static int release(struct socket *sock);
+static int accept(struct socket *sock, struct socket *new_sock, int flags);
static const struct proto_ops packet_ops;
static const struct proto_ops stream_ops;
static const struct proto_ops msg_ops;
static struct proto tipc_proto;
+static struct proto tipc_proto_kern;
static int sockets_enabled;
@@ -141,7 +144,7 @@ static void reject_rx_queue(struct sock *sk)
}
/**
- * tipc_create - create a TIPC socket
+ * tipc_sk_create - create a TIPC socket
* @net: network namespace (must be default network)
* @sock: pre-allocated socket structure
* @protocol: protocol indicator (must be 0)
@@ -152,8 +155,8 @@ static void reject_rx_queue(struct sock *sk)
*
* Returns 0 on success, errno otherwise
*/
-static int tipc_create(struct net *net, struct socket *sock, int protocol,
- int kern)
+static int tipc_sk_create(struct net *net, struct socket *sock, int protocol,
+ int kern)
{
const struct proto_ops *ops;
socket_state state;
@@ -183,7 +186,11 @@ static int tipc_create(struct net *net, struct socket *sock, int protocol,
}
/* Allocate socket's protocol area */
- sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto);
+ if (!kern)
+ sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto);
+ else
+ sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto_kern);
+
if (sk == NULL)
return -ENOMEM;
@@ -219,6 +226,78 @@ static int tipc_create(struct net *net, struct socket *sock, int protocol,
}
/**
+ * tipc_sock_create_local - create TIPC socket from inside TIPC module
+ * @type: socket type - SOCK_RDM or SOCK_SEQPACKET
+ *
+ * We cannot use sock_creat_kern here because it bumps module user count.
+ * Since socket owner and creator is the same module we must make sure
+ * that module count remains zero for module local sockets, otherwise
+ * we cannot do rmmod.
+ *
+ * Returns 0 on success, errno otherwise
+ */
+int tipc_sock_create_local(int type, struct socket **res)
+{
+ int rc;
+ struct sock *sk;
+
+ rc = sock_create_lite(AF_TIPC, type, 0, res);
+ if (rc < 0) {
+ pr_err("Failed to create kernel socket\n");
+ return rc;
+ }
+ tipc_sk_create(&init_net, *res, 0, 1);
+
+ sk = (*res)->sk;
+
+ return 0;
+}
+
+/**
+ * tipc_sock_release_local - release socket created by tipc_sock_create_local
+ * @sock: the socket to be released.
+ *
+ * Module reference count is not incremented when such sockets are created,
+ * so we must keep it from being decremented when they are released.
+ */
+void tipc_sock_release_local(struct socket *sock)
+{
+ release(sock);
+ sock->ops = NULL;
+ sock_release(sock);
+}
+
+/**
+ * tipc_sock_accept_local - accept a connection on a socket created
+ * with tipc_sock_create_local. Use this function to avoid that
+ * module reference count is inadvertently incremented.
+ *
+ * @sock: the accepting socket
+ * @newsock: reference to the new socket to be created
+ * @flags: socket flags
+ */
+
+int tipc_sock_accept_local(struct socket *sock, struct socket **newsock,
+ int flags)
+{
+ struct sock *sk = sock->sk;
+ int ret;
+
+ ret = sock_create_lite(sk->sk_family, sk->sk_type,
+ sk->sk_protocol, newsock);
+ if (ret < 0)
+ return ret;
+
+ ret = accept(sock, *newsock, flags);
+ if (ret < 0) {
+ sock_release(*newsock);
+ return ret;
+ }
+ (*newsock)->ops = sock->ops;
+ return ret;
+}
+
+/**
* release - destroy a TIPC socket
* @sock: socket to destroy
*
@@ -1529,7 +1608,7 @@ static int accept(struct socket *sock, struct socket *new_sock, int flags)
buf = skb_peek(&sk->sk_receive_queue);
- res = tipc_create(sock_net(sock->sk), new_sock, 0, 0);
+ res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, 1);
if (res)
goto exit;
@@ -1839,7 +1918,7 @@ static const struct proto_ops stream_ops = {
static const struct net_proto_family tipc_family_ops = {
.owner = THIS_MODULE,
.family = AF_TIPC,
- .create = tipc_create
+ .create = tipc_sk_create
};
static struct proto tipc_proto = {
@@ -1849,6 +1928,12 @@ static struct proto tipc_proto = {
.sysctl_rmem = sysctl_tipc_rmem
};
+static struct proto tipc_proto_kern = {
+ .name = "TIPC",
+ .obj_size = sizeof(struct tipc_sock),
+ .sysctl_rmem = sysctl_tipc_rmem
+};
+
/**
* tipc_socket_init - initialize TIPC socket interface
*
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