| /* |
| * net/tipc/server.c: TIPC server infrastructure |
| * |
| * Copyright (c) 2012-2013, Wind River Systems |
| * Copyright (c) 2017-2018, Ericsson AB |
| * 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 "subscr.h" |
| #include "topsrv.h" |
| #include "core.h" |
| #include "socket.h" |
| #include "addr.h" |
| #include "msg.h" |
| #include "bearer.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 TIPC_SERVER_NAME_LEN 32 |
| |
| /** |
| * struct tipc_topsrv - TIPC server structure |
| * @conn_idr: identifier set of connection |
| * @idr_lock: protect the connection identifier set |
| * @idr_in_use: amount of allocated identifier entry |
| * @net: network namspace instance |
| * @awork: accept work item |
| * @rcv_wq: receive workqueue |
| * @send_wq: send workqueue |
| * @listener: topsrv listener socket |
| * @name: server name |
| */ |
| struct tipc_topsrv { |
| struct idr conn_idr; |
| spinlock_t idr_lock; /* for idr list */ |
| int idr_in_use; |
| struct net *net; |
| struct work_struct awork; |
| struct workqueue_struct *rcv_wq; |
| struct workqueue_struct *send_wq; |
| struct socket *listener; |
| char name[TIPC_SERVER_NAME_LEN]; |
| }; |
| |
| /** |
| * 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 |
| * @sub_list: lsit to all pertaing subscriptions |
| * @sub_lock: lock protecting the subscription list |
| * @rwork: receive work item |
| * @outqueue: pointer to first outbound message in queue |
| * @outqueue_lock: control access to the outqueue |
| * @swork: send work item |
| */ |
| struct tipc_conn { |
| struct kref kref; |
| int conid; |
| struct socket *sock; |
| unsigned long flags; |
| struct tipc_topsrv *server; |
| struct list_head sub_list; |
| spinlock_t sub_lock; /* for subscription list */ |
| struct work_struct rwork; |
| struct list_head outqueue; |
| spinlock_t outqueue_lock; /* for outqueue */ |
| struct work_struct swork; |
| }; |
| |
| /* An entry waiting to be sent */ |
| struct outqueue_entry { |
| bool inactive; |
| struct tipc_event evt; |
| struct list_head list; |
| }; |
| |
| static void tipc_conn_recv_work(struct work_struct *work); |
| static void tipc_conn_send_work(struct work_struct *work); |
| static void tipc_topsrv_kern_evt(struct net *net, struct tipc_event *evt); |
| static void tipc_conn_delete_sub(struct tipc_conn *con, struct tipc_subscr *s); |
| |
| static bool connected(struct tipc_conn *con) |
| { |
| return con && test_bit(CF_CONNECTED, &con->flags); |
| } |
| |
| static void tipc_conn_kref_release(struct kref *kref) |
| { |
| struct tipc_conn *con = container_of(kref, struct tipc_conn, kref); |
| struct tipc_topsrv *s = con->server; |
| struct outqueue_entry *e, *safe; |
| |
| spin_lock_bh(&s->idr_lock); |
| idr_remove(&s->conn_idr, con->conid); |
| s->idr_in_use--; |
| spin_unlock_bh(&s->idr_lock); |
| if (con->sock) |
| sock_release(con->sock); |
| |
| spin_lock_bh(&con->outqueue_lock); |
| list_for_each_entry_safe(e, safe, &con->outqueue, list) { |
| list_del(&e->list); |
| kfree(e); |
| } |
| spin_unlock_bh(&con->outqueue_lock); |
| 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 void tipc_conn_close(struct tipc_conn *con) |
| { |
| 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; |
| tipc_conn_delete_sub(con, NULL); |
| } |
| 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_conn_alloc(struct tipc_topsrv *s) |
| { |
| struct tipc_conn *con; |
| int ret; |
| |
| con = kzalloc(sizeof(*con), GFP_ATOMIC); |
| if (!con) |
| return ERR_PTR(-ENOMEM); |
| |
| kref_init(&con->kref); |
| INIT_LIST_HEAD(&con->outqueue); |
| INIT_LIST_HEAD(&con->sub_list); |
| spin_lock_init(&con->outqueue_lock); |
| spin_lock_init(&con->sub_lock); |
| INIT_WORK(&con->swork, tipc_conn_send_work); |
| INIT_WORK(&con->rwork, tipc_conn_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 struct tipc_conn *tipc_conn_lookup(struct tipc_topsrv *s, int conid) |
| { |
| struct tipc_conn *con; |
| |
| spin_lock_bh(&s->idr_lock); |
| con = idr_find(&s->conn_idr, conid); |
| if (!connected(con) || !kref_get_unless_zero(&con->kref)) |
| con = NULL; |
| spin_unlock_bh(&s->idr_lock); |
| return con; |
| } |
| |
| /* tipc_conn_delete_sub - delete a specific or all subscriptions |
| * for a given subscriber |
| */ |
| static void tipc_conn_delete_sub(struct tipc_conn *con, struct tipc_subscr *s) |
| { |
| struct tipc_net *tn = tipc_net(con->server->net); |
| struct list_head *sub_list = &con->sub_list; |
| struct tipc_subscription *sub, *tmp; |
| |
| spin_lock_bh(&con->sub_lock); |
| list_for_each_entry_safe(sub, tmp, sub_list, sub_list) { |
| if (!s || !memcmp(s, &sub->evt.s, sizeof(*s))) { |
| tipc_sub_unsubscribe(sub); |
| atomic_dec(&tn->subscription_count); |
| } else if (s) { |
| break; |
| } |
| } |
| spin_unlock_bh(&con->sub_lock); |
| } |
| |
| static void tipc_conn_send_to_sock(struct tipc_conn *con) |
| { |
| struct list_head *queue = &con->outqueue; |
| struct tipc_topsrv *srv = con->server; |
| struct outqueue_entry *e; |
| struct tipc_event *evt; |
| struct msghdr msg; |
| struct kvec iov; |
| int count = 0; |
| int ret; |
| |
| spin_lock_bh(&con->outqueue_lock); |
| |
| while (!list_empty(queue)) { |
| e = list_first_entry(queue, struct outqueue_entry, list); |
| evt = &e->evt; |
| spin_unlock_bh(&con->outqueue_lock); |
| |
| if (e->inactive) |
| tipc_conn_delete_sub(con, &evt->s); |
| |
| memset(&msg, 0, sizeof(msg)); |
| msg.msg_flags = MSG_DONTWAIT; |
| iov.iov_base = evt; |
| iov.iov_len = sizeof(*evt); |
| msg.msg_name = NULL; |
| |
| if (con->sock) { |
| ret = kernel_sendmsg(con->sock, &msg, &iov, |
| 1, sizeof(*evt)); |
| if (ret == -EWOULDBLOCK || ret == 0) { |
| cond_resched(); |
| return; |
| } else if (ret < 0) { |
| return tipc_conn_close(con); |
| } |
| } else { |
| tipc_topsrv_kern_evt(srv->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); |
| kfree(e); |
| } |
| spin_unlock_bh(&con->outqueue_lock); |
| } |
| |
| static void tipc_conn_send_work(struct work_struct *work) |
| { |
| struct tipc_conn *con = container_of(work, struct tipc_conn, swork); |
| |
| if (connected(con)) |
| tipc_conn_send_to_sock(con); |
| |
| conn_put(con); |
| } |
| |
| /* tipc_topsrv_queue_evt() - interrupt level call from a subscription instance |
| * The queued work is launched into tipc_conn_send_work()->tipc_conn_send_to_sock() |
| */ |
| void tipc_topsrv_queue_evt(struct net *net, int conid, |
| u32 event, struct tipc_event *evt) |
| { |
| struct tipc_topsrv *srv = tipc_topsrv(net); |
| struct outqueue_entry *e; |
| struct tipc_conn *con; |
| |
| con = tipc_conn_lookup(srv, conid); |
| if (!con) |
| return; |
| |
| if (!connected(con)) |
| goto err; |
| |
| e = kmalloc(sizeof(*e), GFP_ATOMIC); |
| if (!e) |
| goto err; |
| e->inactive = (event == TIPC_SUBSCR_TIMEOUT); |
| memcpy(&e->evt, evt, sizeof(*evt)); |
| spin_lock_bh(&con->outqueue_lock); |
| list_add_tail(&e->list, &con->outqueue); |
| spin_unlock_bh(&con->outqueue_lock); |
| |
| if (queue_work(srv->send_wq, &con->swork)) |
| return; |
| err: |
| conn_put(con); |
| } |
| |
| /* tipc_conn_write_space - interrupt callback after a sendmsg EAGAIN |
| * Indicates that there now is more space in the send buffer |
| * The queued work is launched into tipc_send_work()->tipc_conn_send_to_sock() |
| */ |
| static void tipc_conn_write_space(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->send_wq, &con->swork)) |
| conn_put(con); |
| } |
| read_unlock_bh(&sk->sk_callback_lock); |
| } |
| |
| static int tipc_conn_rcv_sub(struct tipc_topsrv *srv, |
| struct tipc_conn *con, |
| struct tipc_subscr *s) |
| { |
| struct tipc_net *tn = tipc_net(srv->net); |
| struct tipc_subscription *sub; |
| |
| if (tipc_sub_read(s, filter) & TIPC_SUB_CANCEL) { |
| s->filter &= __constant_ntohl(~TIPC_SUB_CANCEL); |
| tipc_conn_delete_sub(con, s); |
| return 0; |
| } |
| if (atomic_read(&tn->subscription_count) >= TIPC_MAX_SUBSCR) { |
| pr_warn("Subscription rejected, max (%u)\n", TIPC_MAX_SUBSCR); |
| return -1; |
| } |
| sub = tipc_sub_subscribe(srv->net, s, con->conid); |
| if (!sub) |
| return -1; |
| atomic_inc(&tn->subscription_count); |
| spin_lock_bh(&con->sub_lock); |
| list_add(&sub->sub_list, &con->sub_list); |
| spin_unlock_bh(&con->sub_lock); |
| return 0; |
| } |
| |
| static int tipc_conn_rcv_from_sock(struct tipc_conn *con) |
| { |
| struct tipc_topsrv *srv = con->server; |
| struct sock *sk = con->sock->sk; |
| struct msghdr msg = {}; |
| 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, &iov, 1, iov.iov_len); |
| ret = sock_recvmsg(con->sock, &msg, MSG_DONTWAIT); |
| if (ret == -EWOULDBLOCK) |
| return -EWOULDBLOCK; |
| if (ret == sizeof(s)) { |
| read_lock_bh(&sk->sk_callback_lock); |
| /* RACE: the connection can be closed in the meantime */ |
| if (likely(connected(con))) |
| ret = tipc_conn_rcv_sub(srv, con, &s); |
| read_unlock_bh(&sk->sk_callback_lock); |
| if (!ret) |
| return 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_topsrv_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_loopback_trace(net, &evtq); |
| 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); |
| } |
| |
| static 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; |
| INIT_WORK(&srv->awork, tipc_topsrv_accept); |
| |
| strscpy(srv->name, name, sizeof(srv->name)); |
| 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) |
| goto err_start; |
| |
| ret = tipc_topsrv_create_listener(srv); |
| if (ret < 0) |
| goto err_create; |
| |
| return 0; |
| |
| err_create: |
| tipc_topsrv_work_stop(srv); |
| err_start: |
| kfree(srv); |
| return ret; |
| } |
| |
| static 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); |
| } |
| |
| int __net_init tipc_topsrv_init_net(struct net *net) |
| { |
| return tipc_topsrv_start(net); |
| } |
| |
| void __net_exit tipc_topsrv_exit_net(struct net *net) |
| { |
| tipc_topsrv_stop(net); |
| } |