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![Paolo Abeni](/assets/img/avatar_default.png)
syzbot reported a scheduling while atomic issue at netns
destruction time:
BUG: sleeping function called from invalid context at net/core/sock.c:2769
in_atomic(): 1, irqs_disabled(): 0, pid: 85, name: kworker/u4:3
5 locks held by kworker/u4:3/85:
#0: ((wq_completion)"%s""netns"){+.+.}, at: [<00000000c9792deb>]
process_one_work+0xaaf/0x1af0 kernel/workqueue.c:2084
#1: (net_cleanup_work){+.+.}, at: [<00000000adc12e2a>]
process_one_work+0xb01/0x1af0 kernel/workqueue.c:2088
#2: (net_sem){++++}, at: [<000000009ccb5669>] cleanup_net+0x23f/0xd20
net/core/net_namespace.c:494
#3: (net_mutex){+.+.}, at: [<00000000a92767d9>] cleanup_net+0xa7d/0xd20
net/core/net_namespace.c:496
#4: (&(&srv->idr_lock)->rlock){+...}, at: [<000000001343e568>]
spin_lock_bh include/linux/spinlock.h:315 [inline]
#4: (&(&srv->idr_lock)->rlock){+...}, at: [<000000001343e568>]
tipc_topsrv_stop+0x231/0x610 net/tipc/topsrv.c:685
CPU: 0 PID: 85 Comm: kworker/u4:3 Not tainted 4.16.0-rc1+ #230
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Workqueue: netns cleanup_net
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x194/0x257 lib/dump_stack.c:53
___might_sleep+0x2b2/0x470 kernel/sched/core.c:6128
__might_sleep+0x95/0x190 kernel/sched/core.c:6081
lock_sock_nested+0x37/0x110 net/core/sock.c:2769
lock_sock include/net/sock.h:1463 [inline]
tipc_release+0x103/0xff0 net/tipc/socket.c:572
sock_release+0x8d/0x1e0 net/socket.c:594
tipc_topsrv_stop+0x3c0/0x610 net/tipc/topsrv.c:696
tipc_exit_net+0x15/0x40 net/tipc/core.c:96
ops_exit_list.isra.6+0xae/0x150 net/core/net_namespace.c:148
cleanup_net+0x6ba/0xd20 net/core/net_namespace.c:529
process_one_work+0xbbf/0x1af0 kernel/workqueue.c:2113
worker_thread+0x223/0x1990 kernel/workqueue.c:2247
kthread+0x33c/0x400 kernel/kthread.c:238
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:429
This is caused by tipc_topsrv_stop() releasing the listener socket
with the idr lock held. This changeset addresses the issue moving
the release operation outside such lock.
Reported-and-tested-by: syzbot+749d9d87c294c00ca856@syzkaller.appspotmail.com
Fixes: 0ef897be12
("tipc: separate topology server listener socket from subcsriber sockets")
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Acked-by: ///jon
Signed-off-by: David S. Miller <davem@davemloft.net>
703 lines
18 KiB
C
703 lines
18 KiB
C
/*
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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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#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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/* 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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#define TIPC_SERVER_NAME_LEN 32
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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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* 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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/* 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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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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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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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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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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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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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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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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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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write_lock_bh(&sk->sk_callback_lock);
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disconnect = test_and_clear_bit(CF_CONNECTED, &con->flags);
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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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/* Handle concurrent calls from sending and receiving threads */
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if (!disconnect)
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return;
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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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conn_put(con);
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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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con = kzalloc(sizeof(*con), GFP_ATOMIC);
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if (!con)
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return ERR_PTR(-ENOMEM);
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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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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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set_bit(CF_CONNECTED, &con->flags);
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con->server = s;
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return con;
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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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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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/* 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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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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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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spin_lock_bh(&con->outqueue_lock);
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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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if (e->inactive)
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tipc_conn_delete_sub(con, &evt->s);
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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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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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/* 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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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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if (connected(con))
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tipc_conn_send_to_sock(con);
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conn_put(con);
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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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con = tipc_conn_lookup(srv, conid);
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if (!con)
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return;
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if (!connected(con))
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goto err;
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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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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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/* 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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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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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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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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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;
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struct kvec iov;
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int ret;
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iov.iov_base = &s;
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iov.iov_len = sizeof(s);
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msg.msg_name = NULL;
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iov_iter_kvec(&msg.msg_iter, READ | ITER_KVEC, &iov, 1, iov.iov_len);
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ret = sock_recvmsg(con->sock, &msg, MSG_DONTWAIT);
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if (ret == -EWOULDBLOCK)
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return -EWOULDBLOCK;
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if (ret > 0) {
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read_lock_bh(&sk->sk_callback_lock);
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ret = tipc_conn_rcv_sub(srv, con, &s);
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read_unlock_bh(&sk->sk_callback_lock);
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}
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if (ret < 0)
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tipc_conn_close(con);
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return ret;
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}
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static void tipc_conn_recv_work(struct work_struct *work)
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{
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struct tipc_conn *con = container_of(work, struct tipc_conn, rwork);
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int count = 0;
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while (connected(con)) {
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if (tipc_conn_rcv_from_sock(con))
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break;
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/* Don't flood Rx machine */
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if (++count >= MAX_RECV_MSG_COUNT) {
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cond_resched();
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count = 0;
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}
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}
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|
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)
|
|
return true;
|
|
conn_put(con);
|
|
return false;
|
|
}
|
|
|
|
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);
|
|
srv->listener = NULL;
|
|
spin_unlock_bh(&srv->idr_lock);
|
|
sock_release(lsock);
|
|
tipc_topsrv_work_stop(srv);
|
|
idr_destroy(&srv->conn_idr);
|
|
kfree(srv);
|
|
}
|