1 files changed, 0 insertions, 710 deletions

diff --git a/net/tipc/server.c b/net/tipc/server.c
deleted file mode 100644
index df0c563c90cd..000000000000
--- a/net/tipc/server.c
+++ /dev/null
@@ -1,710 +0,0 @@
-/*
- * net/tipc/server.c: TIPC server infrastructure
- *
- * Copyright (c) 2012-2013, Wind River Systems
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. Neither the names of the copyright holders nor the names of its
- *    contributors may be used to endorse or promote products derived from
- *    this software without specific prior written permission.
- *
- * Alternatively, this software may be distributed under the terms of the
- * GNU General Public License ("GPL") version 2 as published by the Free
- * Software Foundation.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
- * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "server.h"
-#include "core.h"
-#include "socket.h"
-#include "addr.h"
-#include "msg.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)
-
-/**
- * struct tipc_conn - TIPC connection structure
- * @kref: reference counter to connection object
- * @conid: connection identifier
- * @sock: socket handler associated with connection
- * @flags: indicates connection state
- * @server: pointer to connected server
- * @rwork: receive work item
- * @usr_data: user-specified field
- * @rx_action: what to do when connection socket is active
- * @outqueue: pointer to first outbound message in queue
- * @outqueue_lock: control access to the outqueue
- * @outqueue: list of connection objects for its server
- * @swork: send work item
- */
-struct tipc_conn {
-	struct kref kref;
-	int conid;
-	struct socket *sock;
-	unsigned long flags;
-	struct tipc_server *server;
-	struct work_struct rwork;
-	int (*rx_action) (struct tipc_conn *con);
-	void *usr_data;
-	struct list_head outqueue;
-	spinlock_t outqueue_lock;
-	struct work_struct swork;
-};
-
-/* An entry waiting to be sent */
-struct outqueue_entry {
-	struct list_head list;
-	struct kvec iov;
-	struct sockaddr_tipc dest;
-};
-
-static void tipc_recv_work(struct work_struct *work);
-static void tipc_send_work(struct work_struct *work);
-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 tipc_server *s = con->server;
-	struct sockaddr_tipc *saddr = s->saddr;
-	struct socket *sock = con->sock;
-	struct sock *sk;
-
-	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));
-		sock_release(sock);
-		con->sock = NULL;
-	}
-	spin_lock_bh(&s->idr_lock);
-	idr_remove(&s->conn_idr, con->conid);
-	s->idr_in_use--;
-	spin_unlock_bh(&s->idr_lock);
-	tipc_clean_outqueues(con);
-	kfree(con);
-}
-
-static void conn_put(struct tipc_conn *con)
-{
-	kref_put(&con->kref, tipc_conn_kref_release);
-}
-
-static void conn_get(struct tipc_conn *con)
-{
-	kref_get(&con->kref);
-}
-
-static struct tipc_conn *tipc_conn_lookup(struct tipc_server *s, int conid)
-{
-	struct tipc_conn *con;
-
-	spin_lock_bh(&s->idr_lock);
-	con = idr_find(&s->conn_idr, conid);
-	if (con) {
-		if (!test_bit(CF_CONNECTED, &con->flags) ||
-		    !kref_get_unless_zero(&con->kref))
-			con = NULL;
-	}
-	spin_unlock_bh(&s->idr_lock);
-	return con;
-}
-
-static void sock_data_ready(struct sock *sk)
-{
-	struct tipc_conn *con;
-
-	read_lock_bh(&sk->sk_callback_lock);
-	con = sock2con(sk);
-	if (con && test_bit(CF_CONNECTED, &con->flags)) {
-		conn_get(con);
-		if (!queue_work(con->server->rcv_wq, &con->rwork))
-			conn_put(con);
-	}
-	read_unlock_bh(&sk->sk_callback_lock);
-}
-
-static void sock_write_space(struct sock *sk)
-{
-	struct tipc_conn *con;
-
-	read_lock_bh(&sk->sk_callback_lock);
-	con = sock2con(sk);
-	if (con && test_bit(CF_CONNECTED, &con->flags)) {
-		conn_get(con);
-		if (!queue_work(con->server->send_wq, &con->swork))
-			conn_put(con);
-	}
-	read_unlock_bh(&sk->sk_callback_lock);
-}
-
-static void tipc_register_callbacks(struct socket *sock, struct tipc_conn *con)
-{
-	struct sock *sk = sock->sk;
-
-	write_lock_bh(&sk->sk_callback_lock);
-
-	sk->sk_data_ready = sock_data_ready;
-	sk->sk_write_space = sock_write_space;
-	sk->sk_user_data = con;
-
-	con->sock = sock;
-
-	write_unlock_bh(&sk->sk_callback_lock);
-}
-
-static void tipc_close_conn(struct tipc_conn *con)
-{
-	struct tipc_server *s = con->server;
-	struct sock *sk = con->sock->sk;
-	bool disconnect = false;
-
-	write_lock_bh(&sk->sk_callback_lock);
-	disconnect = test_and_clear_bit(CF_CONNECTED, &con->flags);
-	if (disconnect) {
-		sk->sk_user_data = NULL;
-		if (con->conid)
-			s->tipc_conn_release(con->conid, con->usr_data);
-	}
-	write_unlock_bh(&sk->sk_callback_lock);
-
-	/* Handle concurrent calls from sending and receiving threads */
-	if (!disconnect)
-		return;
-
-	/* Don't flush pending works, -just let them expire */
-	kernel_sock_shutdown(con->sock, SHUT_RDWR);
-	conn_put(con);
-}
-
-static struct tipc_conn *tipc_alloc_conn(struct tipc_server *s)
-{
-	struct tipc_conn *con;
-	int ret;
-
-	con = kzalloc(sizeof(struct tipc_conn), GFP_ATOMIC);
-	if (!con)
-		return ERR_PTR(-ENOMEM);
-
-	kref_init(&con->kref);
-	INIT_LIST_HEAD(&con->outqueue);
-	spin_lock_init(&con->outqueue_lock);
-	INIT_WORK(&con->swork, tipc_send_work);
-	INIT_WORK(&con->rwork, tipc_recv_work);
-
-	spin_lock_bh(&s->idr_lock);
-	ret = idr_alloc(&s->conn_idr, con, 0, 0, GFP_ATOMIC);
-	if (ret < 0) {
-		kfree(con);
-		spin_unlock_bh(&s->idr_lock);
-		return ERR_PTR(-ENOMEM);
-	}
-	con->conid = ret;
-	s->idr_in_use++;
-	spin_unlock_bh(&s->idr_lock);
-
-	set_bit(CF_CONNECTED, &con->flags);
-	con->server = s;
-
-	return con;
-}
-
-static int tipc_receive_from_sock(struct tipc_conn *con)
-{
-	struct tipc_server *s = con->server;
-	struct sock *sk = con->sock->sk;
-	struct sockaddr_tipc addr;
-	struct msghdr msg = {};
-	struct kvec iov;
-	void *buf;
-	int ret;
-
-	buf = kmem_cache_alloc(s->rcvbuf_cache, GFP_ATOMIC);
-	if (!buf) {
-		ret = -ENOMEM;
-		goto out_close;
-	}
-
-	iov.iov_base = buf;
-	iov.iov_len = s->max_rcvbuf_size;
-	msg.msg_name = &addr;
-	iov_iter_kvec(&msg.msg_iter, READ | ITER_KVEC, &iov, 1, iov.iov_len);
-	ret = sock_recvmsg(con->sock, &msg, MSG_DONTWAIT);
-	if (ret <= 0) {
-		kmem_cache_free(s->rcvbuf_cache, buf);
-		goto out_close;
-	}
-
-	read_lock_bh(&sk->sk_callback_lock);
-	if (test_bit(CF_CONNECTED, &con->flags))
-		ret = s->tipc_conn_recvmsg(sock_net(con->sock->sk), con->conid,
-					   &addr, con->usr_data, buf, ret);
-	read_unlock_bh(&sk->sk_callback_lock);
-	kmem_cache_free(s->rcvbuf_cache, buf);
-	if (ret < 0)
-		tipc_conn_terminate(s, con->conid);
-	return ret;
-
-out_close:
-	if (ret != -EWOULDBLOCK)
-		tipc_close_conn(con);
-	else if (ret == 0)
-		/* Don't return success if we really got EOF */
-		ret = -EAGAIN;
-
-	return ret;
-}
-
-static int tipc_accept_from_sock(struct tipc_conn *con)
-{
-	struct tipc_server *s = con->server;
-	struct socket *sock = con->sock;
-	struct socket *newsock;
-	struct tipc_conn *newcon;
-	int ret;
-
-	ret = kernel_accept(sock, &newsock, O_NONBLOCK);
-	if (ret < 0)
-		return ret;
-
-	newcon = tipc_alloc_conn(con->server);
-	if (IS_ERR(newcon)) {
-		ret = PTR_ERR(newcon);
-		sock_release(newsock);
-		return ret;
-	}
-
-	newcon->rx_action = tipc_receive_from_sock;
-	tipc_register_callbacks(newsock, newcon);
-
-	/* Notify that new connection is incoming */
-	newcon->usr_data = s->tipc_conn_new(newcon->conid);
-	if (!newcon->usr_data) {
-		sock_release(newsock);
-		conn_put(newcon);
-		return -ENOMEM;
-	}
-
-	/* Wake up receive process in case of 'SYN+' message */
-	newsock->sk->sk_data_ready(newsock->sk);
-	return ret;
-}
-
-static struct socket *tipc_create_listen_sock(struct tipc_conn *con)
-{
-	struct tipc_server *s = con->server;
-	struct socket *sock = NULL;
-	int ret;
-
-	ret = sock_create_kern(s->net, AF_TIPC, SOCK_SEQPACKET, 0, &sock);
-	if (ret < 0)
-		return NULL;
-	ret = kernel_setsockopt(sock, SOL_TIPC, TIPC_IMPORTANCE,
-				(char *)&s->imp, sizeof(s->imp));
-	if (ret < 0)
-		goto create_err;
-	ret = kernel_bind(sock, (struct sockaddr *)s->saddr, sizeof(*s->saddr));
-	if (ret < 0)
-		goto create_err;
-
-	switch (s->type) {
-	case SOCK_STREAM:
-	case SOCK_SEQPACKET:
-		con->rx_action = tipc_accept_from_sock;
-
-		ret = kernel_listen(sock, 0);
-		if (ret < 0)
-			goto create_err;
-		break;
-	case SOCK_DGRAM:
-	case SOCK_RDM:
-		con->rx_action = tipc_receive_from_sock;
-		break;
-	default:
-		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:
-	kernel_sock_shutdown(sock, SHUT_RDWR);
-	sock_release(sock);
-	return NULL;
-}
-
-static int tipc_open_listening_sock(struct tipc_server *s)
-{
-	struct socket *sock;
-	struct tipc_conn *con;
-
-	con = tipc_alloc_conn(s);
-	if (IS_ERR(con))
-		return PTR_ERR(con);
-
-	sock = tipc_create_listen_sock(con);
-	if (!sock) {
-		idr_remove(&s->conn_idr, con->conid);
-		s->idr_in_use--;
-		kfree(con);
-		return -EINVAL;
-	}
-
-	tipc_register_callbacks(sock, con);
-	return 0;
-}
-
-static struct outqueue_entry *tipc_alloc_entry(void *data, int len)
-{
-	struct outqueue_entry *entry;
-	void *buf;
-
-	entry = kmalloc(sizeof(struct outqueue_entry), GFP_ATOMIC);
-	if (!entry)
-		return NULL;
-
-	buf = kmemdup(data, len, GFP_ATOMIC);
-	if (!buf) {
-		kfree(entry);
-		return NULL;
-	}
-
-	entry->iov.iov_base = buf;
-	entry->iov.iov_len = len;
-
-	return entry;
-}
-
-static void tipc_free_entry(struct outqueue_entry *e)
-{
-	kfree(e->iov.iov_base);
-	kfree(e);
-}
-
-static void tipc_clean_outqueues(struct tipc_conn *con)
-{
-	struct outqueue_entry *e, *safe;
-
-	spin_lock_bh(&con->outqueue_lock);
-	list_for_each_entry_safe(e, safe, &con->outqueue, list) {
-		list_del(&e->list);
-		tipc_free_entry(e);
-	}
-	spin_unlock_bh(&con->outqueue_lock);
-}
-
-int tipc_conn_sendmsg(struct tipc_server *s, int conid,
-		      struct sockaddr_tipc *addr, void *data, size_t len)
-{
-	struct outqueue_entry *e;
-	struct tipc_conn *con;
-
-	con = tipc_conn_lookup(s, conid);
-	if (!con)
-		return -EINVAL;
-
-	if (!test_bit(CF_CONNECTED, &con->flags)) {
-		conn_put(con);
-		return 0;
-	}
-
-	e = tipc_alloc_entry(data, len);
-	if (!e) {
-		conn_put(con);
-		return -ENOMEM;
-	}
-
-	if (addr)
-		memcpy(&e->dest, addr, sizeof(struct sockaddr_tipc));
-
-	spin_lock_bh(&con->outqueue_lock);
-	list_add_tail(&e->list, &con->outqueue);
-	spin_unlock_bh(&con->outqueue_lock);
-
-	if (!queue_work(s->send_wq, &con->swork))
-		conn_put(con);
-	return 0;
-}
-
-void tipc_conn_terminate(struct tipc_server *s, int conid)
-{
-	struct tipc_conn *con;
-
-	con = tipc_conn_lookup(s, conid);
-	if (con) {
-		tipc_close_conn(con);
-		conn_put(con);
-	}
-}
-
-bool tipc_topsrv_kern_subscr(struct net *net, u32 port, u32 type, u32 lower,
-			     u32 upper, u32 filter, int *conid)
-{
-	struct tipc_subscriber *scbr;
-	struct tipc_subscr sub;
-	struct tipc_server *s;
-	struct tipc_conn *con;
-
-	sub.seq.type = type;
-	sub.seq.lower = lower;
-	sub.seq.upper = upper;
-	sub.timeout = TIPC_WAIT_FOREVER;
-	sub.filter = filter;
-	*(u32 *)&sub.usr_handle = port;
-
-	con = tipc_alloc_conn(tipc_topsrv(net));
-	if (IS_ERR(con))
-		return false;
-
-	*conid = con->conid;
-	s = con->server;
-	scbr = s->tipc_conn_new(*conid);
-	if (!scbr) {
-		conn_put(con);
-		return false;
-	}
-
-	con->usr_data = scbr;
-	con->sock = NULL;
-	s->tipc_conn_recvmsg(net, *conid, NULL, scbr, &sub, sizeof(sub));
-	return true;
-}
-
-void tipc_topsrv_kern_unsubscr(struct net *net, int conid)
-{
-	struct tipc_conn *con;
-	struct tipc_server *srv;
-
-	con = tipc_conn_lookup(tipc_topsrv(net), conid);
-	if (!con)
-		return;
-
-	test_and_clear_bit(CF_CONNECTED, &con->flags);
-	srv = con->server;
-	if (con->conid)
-		srv->tipc_conn_release(con->conid, con->usr_data);
-	conn_put(con);
-	conn_put(con);
-}
-
-static void tipc_send_kern_top_evt(struct net *net, struct tipc_event *evt)
-{
-	u32 port = *(u32 *)&evt->s.usr_handle;
-	u32 self = tipc_own_addr(net);
-	struct sk_buff_head evtq;
-	struct sk_buff *skb;
-
-	skb = tipc_msg_create(TOP_SRV, 0, INT_H_SIZE, sizeof(*evt),
-			      self, self, port, port, 0);
-	if (!skb)
-		return;
-	msg_set_dest_droppable(buf_msg(skb), true);
-	memcpy(msg_data(buf_msg(skb)), evt, sizeof(*evt));
-	skb_queue_head_init(&evtq);
-	__skb_queue_tail(&evtq, skb);
-	tipc_sk_rcv(net, &evtq);
-}
-
-static void tipc_send_to_sock(struct tipc_conn *con)
-{
-	struct tipc_server *s = con->server;
-	struct outqueue_entry *e;
-	struct tipc_event *evt;
-	struct msghdr msg;
-	int count = 0;
-	int ret;
-
-	spin_lock_bh(&con->outqueue_lock);
-	while (test_bit(CF_CONNECTED, &con->flags)) {
-		e = list_entry(con->outqueue.next, struct outqueue_entry, list);
-		if ((struct list_head *) e == &con->outqueue)
-			break;
-
-		spin_unlock_bh(&con->outqueue_lock);
-
-		if (con->sock) {
-			memset(&msg, 0, sizeof(msg));
-			msg.msg_flags = MSG_DONTWAIT;
-			if (s->type == SOCK_DGRAM || s->type == SOCK_RDM) {
-				msg.msg_name = &e->dest;
-				msg.msg_namelen = sizeof(struct sockaddr_tipc);
-			}
-			ret = kernel_sendmsg(con->sock, &msg, &e->iov, 1,
-					     e->iov.iov_len);
-			if (ret == -EWOULDBLOCK || ret == 0) {
-				cond_resched();
-				goto out;
-			} else if (ret < 0) {
-				goto send_err;
-			}
-		} else {
-			evt = e->iov.iov_base;
-			tipc_send_kern_top_evt(s->net, evt);
-		}
-		/* Don't starve users filling buffers */
-		if (++count >= MAX_SEND_MSG_COUNT) {
-			cond_resched();
-			count = 0;
-		}
-
-		spin_lock_bh(&con->outqueue_lock);
-		list_del(&e->list);
-		tipc_free_entry(e);
-	}
-	spin_unlock_bh(&con->outqueue_lock);
-out:
-	return;
-
-send_err:
-	tipc_close_conn(con);
-}
-
-static void tipc_recv_work(struct work_struct *work)
-{
-	struct tipc_conn *con = container_of(work, struct tipc_conn, rwork);
-	int count = 0;
-
-	while (test_bit(CF_CONNECTED, &con->flags)) {
-		if (con->rx_action(con))
-			break;
-
-		/* Don't flood Rx machine */
-		if (++count >= MAX_RECV_MSG_COUNT) {
-			cond_resched();
-			count = 0;
-		}
-	}
-	conn_put(con);
-}
-
-static void tipc_send_work(struct work_struct *work)
-{
-	struct tipc_conn *con = container_of(work, struct tipc_conn, swork);
-
-	if (test_bit(CF_CONNECTED, &con->flags))
-		tipc_send_to_sock(con);
-
-	conn_put(con);
-}
-
-static void tipc_work_stop(struct tipc_server *s)
-{
-	destroy_workqueue(s->rcv_wq);
-	destroy_workqueue(s->send_wq);
-}
-
-static int tipc_work_start(struct tipc_server *s)
-{
-	s->rcv_wq = alloc_ordered_workqueue("tipc_rcv", 0);
-	if (!s->rcv_wq) {
-		pr_err("can't start tipc receive workqueue\n");
-		return -ENOMEM;
-	}
-
-	s->send_wq = alloc_ordered_workqueue("tipc_send", 0);
-	if (!s->send_wq) {
-		pr_err("can't start tipc send workqueue\n");
-		destroy_workqueue(s->rcv_wq);
-		return -ENOMEM;
-	}
-
-	return 0;
-}
-
-int tipc_server_start(struct tipc_server *s)
-{
-	int ret;
-
-	spin_lock_init(&s->idr_lock);
-	idr_init(&s->conn_idr);
-	s->idr_in_use = 0;
-
-	s->rcvbuf_cache = kmem_cache_create(s->name, s->max_rcvbuf_size,
-					    0, SLAB_HWCACHE_ALIGN, NULL);
-	if (!s->rcvbuf_cache)
-		return -ENOMEM;
-
-	ret = tipc_work_start(s);
-	if (ret < 0) {
-		kmem_cache_destroy(s->rcvbuf_cache);
-		return ret;
-	}
-	ret = tipc_open_listening_sock(s);
-	if (ret < 0) {
-		tipc_work_stop(s);
-		kmem_cache_destroy(s->rcvbuf_cache);
-		return ret;
-	}
-	return ret;
-}
-
-void tipc_server_stop(struct tipc_server *s)
-{
-	struct tipc_conn *con;
-	int id;
-
-	spin_lock_bh(&s->idr_lock);
-	for (id = 0; s->idr_in_use; id++) {
-		con = idr_find(&s->conn_idr, id);
-		if (con) {
-			spin_unlock_bh(&s->idr_lock);
-			tipc_close_conn(con);
-			spin_lock_bh(&s->idr_lock);
-		}
-	}
-	spin_unlock_bh(&s->idr_lock);
-
-	tipc_work_stop(s);
-	kmem_cache_destroy(s->rcvbuf_cache);
-	idr_destroy(&s->conn_idr);
-}