net/tipc/core.c

   1 /*
   2  * net/tipc/core.c: TIPC module code
   3  *
   4  * Copyright (c) 2003-2006, 2013, Ericsson AB
   5  * Copyright (c) 2005-2006, 2010-2013, Wind River Systems
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the names of the copyright holders nor the names of its
  17  *    contributors may be used to endorse or promote products derived from
  18  *    this software without specific prior written permission.
  19  *
  20  * Alternatively, this software may be distributed under the terms of the
  21  * GNU General Public License ("GPL") version 2 as published by the Free
  22  * Software Foundation.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  25  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  28  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  29  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  30  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  31  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  32  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  33  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  34  * POSSIBILITY OF SUCH DAMAGE.
  35  */
  36
  37 #include "core.h"
  38 #include "name_table.h"
  39 #include "subscr.h"
  40 #include "bearer.h"
  41 #include "net.h"
  42 #include "socket.h"
  43 #include "bcast.h"
  44 #include "node.h"
  45 #include "crypto.h"
  46
  47 #include <linux/module.h>
  48
  49 /* configurable TIPC parameters */
  50 unsigned int tipc_net_id __read_mostly;
  51 int sysctl_tipc_rmem[3] __read_mostly;  /* min/default/max */
  52
  53 static int __net_init tipc_init_net(struct net *net)
  54 {
  55         struct tipc_net *tn = net_generic(net, tipc_net_id);
  56         int err;
  57
  58         tn->net_id = 4711;
  59         tn->node_addr = 0;
  60         tn->trial_addr = 0;
  61         tn->addr_trial_end = 0;
  62         tn->capabilities = TIPC_NODE_CAPABILITIES;
  63         INIT_WORK(&tn->work, tipc_net_finalize_work);
  64         memset(tn->node_id, 0, sizeof(tn->node_id));
  65         memset(tn->node_id_string, 0, sizeof(tn->node_id_string));
  66         tn->mon_threshold = TIPC_DEF_MON_THRESHOLD;
  67         get_random_bytes(&tn->random, sizeof(int));
  68         INIT_LIST_HEAD(&tn->node_list);
  69         spin_lock_init(&tn->node_list_lock);
  70
  71 #ifdef CONFIG_TIPC_CRYPTO
  72         err = tipc_crypto_start(&tn->crypto_tx, net, NULL);
  73         if (err)
  74                 goto out_crypto;
  75 #endif
  76         err = tipc_sk_rht_init(net);
  77         if (err)
  78                 goto out_sk_rht;
  79
  80         err = tipc_nametbl_init(net);
  81         if (err)
  82                 goto out_nametbl;
  83
  84         err = tipc_bcast_init(net);
  85         if (err)
  86                 goto out_bclink;
  87
  88         err = tipc_attach_loopback(net);
  89         if (err)
  90                 goto out_bclink;
  91
  92         return 0;
  93
  94 out_bclink:
  95         tipc_nametbl_stop(net);
  96 out_nametbl:
  97         tipc_sk_rht_destroy(net);
  98 out_sk_rht:
  99
 100 #ifdef CONFIG_TIPC_CRYPTO
 101         tipc_crypto_stop(&tn->crypto_tx);
 102 out_crypto:
 103 #endif
 104         return err;
 105 }
 106
 107 static void __net_exit tipc_exit_net(struct net *net)
 108 {
 109         struct tipc_net *tn = tipc_net(net);
 110
 111         tipc_detach_loopback(net);
 112         /* Make sure the tipc_net_finalize_work() finished */
 113         cancel_work_sync(&tn->work);
 114         tipc_net_stop(net);
 115
 116         tipc_bcast_stop(net);
 117         tipc_nametbl_stop(net);
 118         tipc_sk_rht_destroy(net);
 119 #ifdef CONFIG_TIPC_CRYPTO
 120         tipc_crypto_stop(&tipc_net(net)->crypto_tx);
 121 #endif
 122         while (atomic_read(&tn->wq_count))
 123                 cond_resched();
 124 }
 125
 126 static void __net_exit tipc_pernet_pre_exit(struct net *net)
 127 {
 128         tipc_node_pre_cleanup_net(net);
 129 }
 130
 131 static struct pernet_operations tipc_pernet_pre_exit_ops = {
 132         .pre_exit = tipc_pernet_pre_exit,
 133 };
 134
 135 static struct pernet_operations tipc_net_ops = {
 136         .init = tipc_init_net,
 137         .exit = tipc_exit_net,
 138         .id   = &tipc_net_id,
 139         .size = sizeof(struct tipc_net),
 140 };
 141
 142 static struct pernet_operations tipc_topsrv_net_ops = {
 143         .init = tipc_topsrv_init_net,
 144         .exit = tipc_topsrv_exit_net,
 145 };
 146
 147 static int __init tipc_init(void)
 148 {
 149         int err;
 150
 151         pr_info("Activated (version " TIPC_MOD_VER ")\n");
 152
 153         sysctl_tipc_rmem[0] = RCVBUF_MIN;
 154         sysctl_tipc_rmem[1] = RCVBUF_DEF;
 155         sysctl_tipc_rmem[2] = RCVBUF_MAX;
 156
 157         err = tipc_register_sysctl();
 158         if (err)
 159                 goto out_sysctl;
 160
 161         err = register_pernet_device(&tipc_net_ops);
 162         if (err)
 163                 goto out_pernet;
 164
 165         err = tipc_socket_init();
 166         if (err)
 167                 goto out_socket;
 168
 169         err = register_pernet_device(&tipc_topsrv_net_ops);
 170         if (err)
 171                 goto out_pernet_topsrv;
 172
 173         err = register_pernet_subsys(&tipc_pernet_pre_exit_ops);
 174         if (err)
 175                 goto out_register_pernet_subsys;
 176
 177         err = tipc_bearer_setup();
 178         if (err)
 179                 goto out_bearer;
 180
 181         err = tipc_netlink_start();
 182         if (err)
 183                 goto out_netlink;
 184
 185         err = tipc_netlink_compat_start();
 186         if (err)
 187                 goto out_netlink_compat;
 188
 189         pr_info("Started in single node mode\n");
 190         return 0;
 191
 192 out_netlink_compat:
 193         tipc_netlink_stop();
 194 out_netlink:
 195         tipc_bearer_cleanup();
 196 out_bearer:
 197         unregister_pernet_subsys(&tipc_pernet_pre_exit_ops);
 198 out_register_pernet_subsys:
 199         unregister_pernet_device(&tipc_topsrv_net_ops);
 200 out_pernet_topsrv:
 201         tipc_socket_stop();
 202 out_socket:
 203         unregister_pernet_device(&tipc_net_ops);
 204 out_pernet:
 205         tipc_unregister_sysctl();
 206 out_sysctl:
 207         pr_err("Unable to start in single node mode\n");
 208         return err;
 209 }
 210
 211 static void __exit tipc_exit(void)
 212 {
 213         tipc_netlink_compat_stop();
 214         tipc_netlink_stop();
 215         tipc_bearer_cleanup();
 216         unregister_pernet_subsys(&tipc_pernet_pre_exit_ops);
 217         unregister_pernet_device(&tipc_topsrv_net_ops);
 218         tipc_socket_stop();
 219         unregister_pernet_device(&tipc_net_ops);
 220         tipc_unregister_sysctl();
 221
 222         pr_info("Deactivated\n");
 223 }
 224
 225 module_init(tipc_init);
 226 module_exit(tipc_exit);
 227
 228 MODULE_DESCRIPTION("TIPC: Transparent Inter Process Communication");
 229 MODULE_LICENSE("Dual BSD/GPL");
 230 MODULE_VERSION(TIPC_MOD_VER);