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@@ -0,0 +1,702 @@
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+/*
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+ * net/tipc/server.c: TIPC server infrastructure
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+ *
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+ * Copyright (c) 2012-2013, Wind River Systems
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+ * Copyright (c) 2017-2018, Ericsson AB
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+ * All rights reserved.
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+ *
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+ * Redistribution and use in source and binary forms, with or without
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+ * modification, are permitted provided that the following conditions are met:
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+ *
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+ * 1. Redistributions of source code must retain the above copyright
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+ * notice, this list of conditions and the following disclaimer.
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+ * 2. Redistributions in binary form must reproduce the above copyright
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+ * notice, this list of conditions and the following disclaimer in the
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+ * documentation and/or other materials provided with the distribution.
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+ * 3. Neither the names of the copyright holders nor the names of its
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+ * contributors may be used to endorse or promote products derived from
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+ * this software without specific prior written permission.
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+ *
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+ * Alternatively, this software may be distributed under the terms of the
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+ * GNU General Public License ("GPL") version 2 as published by the Free
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+ * Software Foundation.
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+ *
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+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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+ * POSSIBILITY OF SUCH DAMAGE.
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+ */
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+
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+#include "subscr.h"
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+#include "topsrv.h"
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+#include "core.h"
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+#include "socket.h"
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+#include "addr.h"
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+#include "msg.h"
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+#include <net/sock.h>
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+#include <linux/module.h>
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+
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+/* Number of messages to send before rescheduling */
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+#define MAX_SEND_MSG_COUNT 25
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+#define MAX_RECV_MSG_COUNT 25
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+#define CF_CONNECTED 1
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+#define CF_SERVER 2
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+
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+#define TIPC_SERVER_NAME_LEN 32
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+
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+/**
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+ * struct tipc_topsrv - TIPC server structure
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+ * @conn_idr: identifier set of connection
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+ * @idr_lock: protect the connection identifier set
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+ * @idr_in_use: amount of allocated identifier entry
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+ * @net: network namspace instance
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+ * @rcvbuf_cache: memory cache of server receive buffer
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+ * @rcv_wq: receive workqueue
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+ * @send_wq: send workqueue
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+ * @max_rcvbuf_size: maximum permitted receive message length
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+ * @tipc_conn_new: callback will be called when new connection is incoming
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+ * @tipc_conn_release: callback will be called before releasing the connection
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+ * @tipc_conn_recvmsg: callback will be called when message arrives
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+ * @name: server name
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+ * @imp: message importance
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+ * @type: socket type
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+ */
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+struct tipc_topsrv {
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+ struct idr conn_idr;
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+ spinlock_t idr_lock; /* for idr list */
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+ int idr_in_use;
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+ struct net *net;
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+ struct work_struct awork;
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+ struct workqueue_struct *rcv_wq;
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+ struct workqueue_struct *send_wq;
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+ int max_rcvbuf_size;
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+ struct socket *listener;
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+ char name[TIPC_SERVER_NAME_LEN];
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+};
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+
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+/**
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+ * struct tipc_conn - TIPC connection structure
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+ * @kref: reference counter to connection object
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+ * @conid: connection identifier
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+ * @sock: socket handler associated with connection
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+ * @flags: indicates connection state
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+ * @server: pointer to connected server
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+ * @sub_list: lsit to all pertaing subscriptions
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+ * @sub_lock: lock protecting the subscription list
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+ * @outqueue_lock: control access to the outqueue
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+ * @rwork: receive work item
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+ * @rx_action: what to do when connection socket is active
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+ * @outqueue: pointer to first outbound message in queue
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+ * @outqueue_lock: control access to the outqueue
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+ * @swork: send work item
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+ */
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+struct tipc_conn {
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+ struct kref kref;
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+ int conid;
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+ struct socket *sock;
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+ unsigned long flags;
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+ struct tipc_topsrv *server;
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+ struct list_head sub_list;
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+ spinlock_t sub_lock; /* for subscription list */
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+ struct work_struct rwork;
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+ struct list_head outqueue;
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+ spinlock_t outqueue_lock; /* for outqueue */
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+ struct work_struct swork;
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+};
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+
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+/* An entry waiting to be sent */
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+struct outqueue_entry {
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+ bool inactive;
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+ struct tipc_event evt;
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+ struct list_head list;
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+};
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+
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+static void tipc_conn_recv_work(struct work_struct *work);
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+static void tipc_conn_send_work(struct work_struct *work);
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+static void tipc_topsrv_kern_evt(struct net *net, struct tipc_event *evt);
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+static void tipc_conn_delete_sub(struct tipc_conn *con, struct tipc_subscr *s);
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+
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+static bool connected(struct tipc_conn *con)
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+{
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+ return con && test_bit(CF_CONNECTED, &con->flags);
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+}
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+
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+static void tipc_conn_kref_release(struct kref *kref)
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+{
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+ struct tipc_conn *con = container_of(kref, struct tipc_conn, kref);
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+ struct tipc_topsrv *s = con->server;
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+ struct outqueue_entry *e, *safe;
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+
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+ spin_lock_bh(&s->idr_lock);
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+ idr_remove(&s->conn_idr, con->conid);
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+ s->idr_in_use--;
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+ spin_unlock_bh(&s->idr_lock);
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+ if (con->sock)
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+ sock_release(con->sock);
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+
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+ spin_lock_bh(&con->outqueue_lock);
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+ list_for_each_entry_safe(e, safe, &con->outqueue, list) {
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+ list_del(&e->list);
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+ kfree(e);
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+ }
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+ spin_unlock_bh(&con->outqueue_lock);
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+ kfree(con);
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+}
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+
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+static void conn_put(struct tipc_conn *con)
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+{
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+ kref_put(&con->kref, tipc_conn_kref_release);
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+}
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+
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+static void conn_get(struct tipc_conn *con)
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+{
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+ kref_get(&con->kref);
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+}
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+
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+static void tipc_conn_close(struct tipc_conn *con)
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+{
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+ struct sock *sk = con->sock->sk;
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+ bool disconnect = false;
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+
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+ write_lock_bh(&sk->sk_callback_lock);
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+ disconnect = test_and_clear_bit(CF_CONNECTED, &con->flags);
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+
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+ if (disconnect) {
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+ sk->sk_user_data = NULL;
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+ tipc_conn_delete_sub(con, NULL);
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+ }
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+ write_unlock_bh(&sk->sk_callback_lock);
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+
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+ /* Handle concurrent calls from sending and receiving threads */
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+ if (!disconnect)
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+ return;
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+
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+ /* Don't flush pending works, -just let them expire */
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+ kernel_sock_shutdown(con->sock, SHUT_RDWR);
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+
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+ conn_put(con);
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+}
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+
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+static struct tipc_conn *tipc_conn_alloc(struct tipc_topsrv *s)
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+{
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+ struct tipc_conn *con;
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+ int ret;
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+
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+ con = kzalloc(sizeof(*con), GFP_ATOMIC);
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+ if (!con)
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+ return ERR_PTR(-ENOMEM);
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+
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+ kref_init(&con->kref);
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+ INIT_LIST_HEAD(&con->outqueue);
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+ INIT_LIST_HEAD(&con->sub_list);
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+ spin_lock_init(&con->outqueue_lock);
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+ spin_lock_init(&con->sub_lock);
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+ INIT_WORK(&con->swork, tipc_conn_send_work);
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+ INIT_WORK(&con->rwork, tipc_conn_recv_work);
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+
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+ spin_lock_bh(&s->idr_lock);
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+ ret = idr_alloc(&s->conn_idr, con, 0, 0, GFP_ATOMIC);
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+ if (ret < 0) {
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+ kfree(con);
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+ spin_unlock_bh(&s->idr_lock);
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+ return ERR_PTR(-ENOMEM);
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+ }
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+ con->conid = ret;
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+ s->idr_in_use++;
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+ spin_unlock_bh(&s->idr_lock);
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+
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+ set_bit(CF_CONNECTED, &con->flags);
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+ con->server = s;
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+
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+ return con;
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+}
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+
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+static struct tipc_conn *tipc_conn_lookup(struct tipc_topsrv *s, int conid)
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+{
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+ struct tipc_conn *con;
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+
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+ spin_lock_bh(&s->idr_lock);
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+ con = idr_find(&s->conn_idr, conid);
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+ if (!connected(con) || !kref_get_unless_zero(&con->kref))
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+ con = NULL;
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+ spin_unlock_bh(&s->idr_lock);
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+ return con;
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+}
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+
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+/* tipc_conn_delete_sub - delete a specific or all subscriptions
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+ * for a given subscriber
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+ */
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+static void tipc_conn_delete_sub(struct tipc_conn *con, struct tipc_subscr *s)
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+{
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+ struct tipc_net *tn = tipc_net(con->server->net);
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+ struct list_head *sub_list = &con->sub_list;
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+ struct tipc_subscription *sub, *tmp;
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+
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+ spin_lock_bh(&con->sub_lock);
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+ list_for_each_entry_safe(sub, tmp, sub_list, sub_list) {
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+ if (!s || !memcmp(s, &sub->evt.s, sizeof(*s))) {
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+ tipc_sub_unsubscribe(sub);
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+ atomic_dec(&tn->subscription_count);
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+ } else if (s) {
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+ break;
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+ }
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+ }
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+ spin_unlock_bh(&con->sub_lock);
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+}
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+
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+static void tipc_conn_send_to_sock(struct tipc_conn *con)
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+{
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+ struct list_head *queue = &con->outqueue;
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+ struct tipc_topsrv *srv = con->server;
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+ struct outqueue_entry *e;
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+ struct tipc_event *evt;
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+ struct msghdr msg;
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+ struct kvec iov;
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+ int count = 0;
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+ int ret;
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+
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+ spin_lock_bh(&con->outqueue_lock);
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+
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+ while (!list_empty(queue)) {
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+ e = list_first_entry(queue, struct outqueue_entry, list);
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+ evt = &e->evt;
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+ spin_unlock_bh(&con->outqueue_lock);
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+
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+ if (e->inactive)
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+ tipc_conn_delete_sub(con, &evt->s);
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+
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+ memset(&msg, 0, sizeof(msg));
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+ msg.msg_flags = MSG_DONTWAIT;
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+ iov.iov_base = evt;
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+ iov.iov_len = sizeof(*evt);
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+ msg.msg_name = NULL;
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+
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+ if (con->sock) {
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+ ret = kernel_sendmsg(con->sock, &msg, &iov,
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+ 1, sizeof(*evt));
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+ if (ret == -EWOULDBLOCK || ret == 0) {
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+ cond_resched();
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+ return;
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+ } else if (ret < 0) {
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+ return tipc_conn_close(con);
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+ }
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+ } else {
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+ tipc_topsrv_kern_evt(srv->net, evt);
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+ }
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+
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+ /* Don't starve users filling buffers */
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+ if (++count >= MAX_SEND_MSG_COUNT) {
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+ cond_resched();
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+ count = 0;
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+ }
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+ spin_lock_bh(&con->outqueue_lock);
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+ list_del(&e->list);
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+ kfree(e);
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+ }
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+ spin_unlock_bh(&con->outqueue_lock);
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+}
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+
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+static void tipc_conn_send_work(struct work_struct *work)
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+{
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+ struct tipc_conn *con = container_of(work, struct tipc_conn, swork);
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+
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+ if (connected(con))
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+ tipc_conn_send_to_sock(con);
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+
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+ conn_put(con);
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+}
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+
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+/* tipc_conn_queue_evt() - interrupt level call from a subscription instance
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+ * The queued work is launched into tipc_send_work()->tipc_send_to_sock()
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+ */
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+void tipc_topsrv_queue_evt(struct net *net, int conid,
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+ u32 event, struct tipc_event *evt)
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+{
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+ struct tipc_topsrv *srv = tipc_topsrv(net);
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+ struct outqueue_entry *e;
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+ struct tipc_conn *con;
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+
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+ con = tipc_conn_lookup(srv, conid);
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+ if (!con)
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+ return;
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+
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+ if (!connected(con))
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+ goto err;
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+
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+ e = kmalloc(sizeof(*e), GFP_ATOMIC);
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+ if (!e)
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+ goto err;
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+ e->inactive = (event == TIPC_SUBSCR_TIMEOUT);
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+ memcpy(&e->evt, evt, sizeof(*evt));
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+ spin_lock_bh(&con->outqueue_lock);
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+ list_add_tail(&e->list, &con->outqueue);
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+ spin_unlock_bh(&con->outqueue_lock);
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+
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+ if (queue_work(srv->send_wq, &con->swork))
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+ return;
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+err:
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+ conn_put(con);
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+}
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+
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+/* tipc_conn_write_space - interrupt callback after a sendmsg EAGAIN
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+ * Indicates that there now is more space in the send buffer
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+ * The queued work is launched into tipc_send_work()->tipc_conn_send_to_sock()
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+ */
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+static void tipc_conn_write_space(struct sock *sk)
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+{
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+ struct tipc_conn *con;
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+
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+ read_lock_bh(&sk->sk_callback_lock);
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+ con = sk->sk_user_data;
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+ if (connected(con)) {
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+ conn_get(con);
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+ if (!queue_work(con->server->send_wq, &con->swork))
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+ conn_put(con);
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+ }
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+ read_unlock_bh(&sk->sk_callback_lock);
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+}
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+
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+static int tipc_conn_rcv_sub(struct tipc_topsrv *srv,
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+ struct tipc_conn *con,
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+ struct tipc_subscr *s)
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+{
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+ struct tipc_net *tn = tipc_net(srv->net);
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+ struct tipc_subscription *sub;
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+
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+ if (tipc_sub_read(s, filter) & TIPC_SUB_CANCEL) {
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+ tipc_conn_delete_sub(con, s);
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+ return 0;
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+ }
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+ if (atomic_read(&tn->subscription_count) >= TIPC_MAX_SUBSCR) {
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+ pr_warn("Subscription rejected, max (%u)\n", TIPC_MAX_SUBSCR);
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+ return -1;
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+ }
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+ sub = tipc_sub_subscribe(srv->net, s, con->conid);
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+ if (!sub)
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+ return -1;
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+ atomic_inc(&tn->subscription_count);
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+ spin_lock_bh(&con->sub_lock);
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+ list_add(&sub->sub_list, &con->sub_list);
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+ spin_unlock_bh(&con->sub_lock);
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+ return 0;
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+}
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+
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+static int tipc_conn_rcv_from_sock(struct tipc_conn *con)
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+{
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+ struct tipc_topsrv *srv = con->server;
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+ struct sock *sk = con->sock->sk;
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+ struct msghdr msg = {};
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+ struct tipc_subscr s;
|
|
|
+ struct kvec iov;
|
|
|
+ int ret;
|
|
|
+
|
|
|
+ iov.iov_base = &s;
|
|
|
+ iov.iov_len = sizeof(s);
|
|
|
+ msg.msg_name = NULL;
|
|
|
+ iov_iter_kvec(&msg.msg_iter, READ | ITER_KVEC, &iov, 1, iov.iov_len);
|
|
|
+ ret = sock_recvmsg(con->sock, &msg, MSG_DONTWAIT);
|
|
|
+ if (ret == -EWOULDBLOCK)
|
|
|
+ return -EWOULDBLOCK;
|
|
|
+ if (ret > 0) {
|
|
|
+ read_lock_bh(&sk->sk_callback_lock);
|
|
|
+ ret = tipc_conn_rcv_sub(srv, con, &s);
|
|
|
+ read_unlock_bh(&sk->sk_callback_lock);
|
|
|
+ }
|
|
|
+ if (ret < 0)
|
|
|
+ tipc_conn_close(con);
|
|
|
+
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+static void tipc_conn_recv_work(struct work_struct *work)
|
|
|
+{
|
|
|
+ struct tipc_conn *con = container_of(work, struct tipc_conn, rwork);
|
|
|
+ int count = 0;
|
|
|
+
|
|
|
+ while (connected(con)) {
|
|
|
+ if (tipc_conn_rcv_from_sock(con))
|
|
|
+ break;
|
|
|
+
|
|
|
+ /* Don't flood Rx machine */
|
|
|
+ if (++count >= MAX_RECV_MSG_COUNT) {
|
|
|
+ cond_resched();
|
|
|
+ count = 0;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ conn_put(con);
|
|
|
+}
|
|
|
+
|
|
|
+/* tipc_conn_data_ready - interrupt callback indicating the socket has data
|
|
|
+ * The queued work is launched into tipc_recv_work()->tipc_conn_rcv_from_sock()
|
|
|
+ */
|
|
|
+static void tipc_conn_data_ready(struct sock *sk)
|
|
|
+{
|
|
|
+ struct tipc_conn *con;
|
|
|
+
|
|
|
+ read_lock_bh(&sk->sk_callback_lock);
|
|
|
+ con = sk->sk_user_data;
|
|
|
+ if (connected(con)) {
|
|
|
+ conn_get(con);
|
|
|
+ if (!queue_work(con->server->rcv_wq, &con->rwork))
|
|
|
+ conn_put(con);
|
|
|
+ }
|
|
|
+ read_unlock_bh(&sk->sk_callback_lock);
|
|
|
+}
|
|
|
+
|
|
|
+static void tipc_topsrv_accept(struct work_struct *work)
|
|
|
+{
|
|
|
+ struct tipc_topsrv *srv = container_of(work, struct tipc_topsrv, awork);
|
|
|
+ struct socket *lsock = srv->listener;
|
|
|
+ struct socket *newsock;
|
|
|
+ struct tipc_conn *con;
|
|
|
+ struct sock *newsk;
|
|
|
+ int ret;
|
|
|
+
|
|
|
+ while (1) {
|
|
|
+ ret = kernel_accept(lsock, &newsock, O_NONBLOCK);
|
|
|
+ if (ret < 0)
|
|
|
+ return;
|
|
|
+ con = tipc_conn_alloc(srv);
|
|
|
+ if (IS_ERR(con)) {
|
|
|
+ ret = PTR_ERR(con);
|
|
|
+ sock_release(newsock);
|
|
|
+ return;
|
|
|
+ }
|
|
|
+ /* Register callbacks */
|
|
|
+ newsk = newsock->sk;
|
|
|
+ write_lock_bh(&newsk->sk_callback_lock);
|
|
|
+ newsk->sk_data_ready = tipc_conn_data_ready;
|
|
|
+ newsk->sk_write_space = tipc_conn_write_space;
|
|
|
+ newsk->sk_user_data = con;
|
|
|
+ con->sock = newsock;
|
|
|
+ write_unlock_bh(&newsk->sk_callback_lock);
|
|
|
+
|
|
|
+ /* Wake up receive process in case of 'SYN+' message */
|
|
|
+ newsk->sk_data_ready(newsk);
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+/* tipc_toprsv_listener_data_ready - interrupt callback with connection request
|
|
|
+ * The queued job is launched into tipc_topsrv_accept()
|
|
|
+ */
|
|
|
+static void tipc_topsrv_listener_data_ready(struct sock *sk)
|
|
|
+{
|
|
|
+ struct tipc_topsrv *srv;
|
|
|
+
|
|
|
+ read_lock_bh(&sk->sk_callback_lock);
|
|
|
+ srv = sk->sk_user_data;
|
|
|
+ if (srv->listener)
|
|
|
+ queue_work(srv->rcv_wq, &srv->awork);
|
|
|
+ read_unlock_bh(&sk->sk_callback_lock);
|
|
|
+}
|
|
|
+
|
|
|
+static int tipc_topsrv_create_listener(struct tipc_topsrv *srv)
|
|
|
+{
|
|
|
+ int imp = TIPC_CRITICAL_IMPORTANCE;
|
|
|
+ struct socket *lsock = NULL;
|
|
|
+ struct sockaddr_tipc saddr;
|
|
|
+ struct sock *sk;
|
|
|
+ int rc;
|
|
|
+
|
|
|
+ rc = sock_create_kern(srv->net, AF_TIPC, SOCK_SEQPACKET, 0, &lsock);
|
|
|
+ if (rc < 0)
|
|
|
+ return rc;
|
|
|
+
|
|
|
+ srv->listener = lsock;
|
|
|
+ sk = lsock->sk;
|
|
|
+ write_lock_bh(&sk->sk_callback_lock);
|
|
|
+ sk->sk_data_ready = tipc_topsrv_listener_data_ready;
|
|
|
+ sk->sk_user_data = srv;
|
|
|
+ write_unlock_bh(&sk->sk_callback_lock);
|
|
|
+
|
|
|
+ rc = kernel_setsockopt(lsock, SOL_TIPC, TIPC_IMPORTANCE,
|
|
|
+ (char *)&imp, sizeof(imp));
|
|
|
+ if (rc < 0)
|
|
|
+ goto err;
|
|
|
+
|
|
|
+ saddr.family = AF_TIPC;
|
|
|
+ saddr.addrtype = TIPC_ADDR_NAMESEQ;
|
|
|
+ saddr.addr.nameseq.type = TIPC_TOP_SRV;
|
|
|
+ saddr.addr.nameseq.lower = TIPC_TOP_SRV;
|
|
|
+ saddr.addr.nameseq.upper = TIPC_TOP_SRV;
|
|
|
+ saddr.scope = TIPC_NODE_SCOPE;
|
|
|
+
|
|
|
+ rc = kernel_bind(lsock, (struct sockaddr *)&saddr, sizeof(saddr));
|
|
|
+ if (rc < 0)
|
|
|
+ goto err;
|
|
|
+ rc = kernel_listen(lsock, 0);
|
|
|
+ if (rc < 0)
|
|
|
+ goto 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(lsock->ops->owner);
|
|
|
+ module_put(sk->sk_prot_creator->owner);
|
|
|
+
|
|
|
+ return 0;
|
|
|
+err:
|
|
|
+ sock_release(lsock);
|
|
|
+ return -EINVAL;
|
|
|
+}
|
|
|
+
|
|
|
+bool tipc_topsrv_kern_subscr(struct net *net, u32 port, u32 type, u32 lower,
|
|
|
+ u32 upper, u32 filter, int *conid)
|
|
|
+{
|
|
|
+ struct tipc_subscr sub;
|
|
|
+ struct tipc_conn *con;
|
|
|
+ int rc;
|
|
|
+
|
|
|
+ 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_conn_alloc(tipc_topsrv(net));
|
|
|
+ if (IS_ERR(con))
|
|
|
+ return false;
|
|
|
+
|
|
|
+ *conid = con->conid;
|
|
|
+ con->sock = NULL;
|
|
|
+ rc = tipc_conn_rcv_sub(tipc_topsrv(net), con, &sub);
|
|
|
+ if (rc < 0)
|
|
|
+ tipc_conn_close(con);
|
|
|
+ return !rc;
|
|
|
+}
|
|
|
+
|
|
|
+void tipc_topsrv_kern_unsubscr(struct net *net, int conid)
|
|
|
+{
|
|
|
+ struct tipc_conn *con;
|
|
|
+
|
|
|
+ con = tipc_conn_lookup(tipc_topsrv(net), conid);
|
|
|
+ if (!con)
|
|
|
+ return;
|
|
|
+
|
|
|
+ test_and_clear_bit(CF_CONNECTED, &con->flags);
|
|
|
+ tipc_conn_delete_sub(con, NULL);
|
|
|
+ conn_put(con);
|
|
|
+ conn_put(con);
|
|
|
+}
|
|
|
+
|
|
|
+static void tipc_topsrv_kern_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 int tipc_topsrv_work_start(struct tipc_topsrv *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;
|
|
|
+}
|
|
|
+
|
|
|
+static void tipc_topsrv_work_stop(struct tipc_topsrv *s)
|
|
|
+{
|
|
|
+ destroy_workqueue(s->rcv_wq);
|
|
|
+ destroy_workqueue(s->send_wq);
|
|
|
+}
|
|
|
+
|
|
|
+int tipc_topsrv_start(struct net *net)
|
|
|
+{
|
|
|
+ struct tipc_net *tn = tipc_net(net);
|
|
|
+ const char name[] = "topology_server";
|
|
|
+ struct tipc_topsrv *srv;
|
|
|
+ int ret;
|
|
|
+
|
|
|
+ srv = kzalloc(sizeof(*srv), GFP_ATOMIC);
|
|
|
+ if (!srv)
|
|
|
+ return -ENOMEM;
|
|
|
+
|
|
|
+ srv->net = net;
|
|
|
+ srv->max_rcvbuf_size = sizeof(struct tipc_subscr);
|
|
|
+ INIT_WORK(&srv->awork, tipc_topsrv_accept);
|
|
|
+
|
|
|
+ strncpy(srv->name, name, strlen(name) + 1);
|
|
|
+ tn->topsrv = srv;
|
|
|
+ atomic_set(&tn->subscription_count, 0);
|
|
|
+
|
|
|
+ spin_lock_init(&srv->idr_lock);
|
|
|
+ idr_init(&srv->conn_idr);
|
|
|
+ srv->idr_in_use = 0;
|
|
|
+
|
|
|
+ ret = tipc_topsrv_work_start(srv);
|
|
|
+ if (ret < 0)
|
|
|
+ return ret;
|
|
|
+
|
|
|
+ ret = tipc_topsrv_create_listener(srv);
|
|
|
+ if (ret < 0)
|
|
|
+ tipc_topsrv_work_stop(srv);
|
|
|
+
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+void tipc_topsrv_stop(struct net *net)
|
|
|
+{
|
|
|
+ struct tipc_topsrv *srv = tipc_topsrv(net);
|
|
|
+ struct socket *lsock = srv->listener;
|
|
|
+ struct tipc_conn *con;
|
|
|
+ int id;
|
|
|
+
|
|
|
+ spin_lock_bh(&srv->idr_lock);
|
|
|
+ for (id = 0; srv->idr_in_use; id++) {
|
|
|
+ con = idr_find(&srv->conn_idr, id);
|
|
|
+ if (con) {
|
|
|
+ spin_unlock_bh(&srv->idr_lock);
|
|
|
+ tipc_conn_close(con);
|
|
|
+ spin_lock_bh(&srv->idr_lock);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ __module_get(lsock->ops->owner);
|
|
|
+ __module_get(lsock->sk->sk_prot_creator->owner);
|
|
|
+ sock_release(lsock);
|
|
|
+ srv->listener = NULL;
|
|
|
+ spin_unlock_bh(&srv->idr_lock);
|
|
|
+ tipc_topsrv_work_stop(srv);
|
|
|
+ idr_destroy(&srv->conn_idr);
|
|
|
+ kfree(srv);
|
|
|
+}
|
David S. Miller