LXR linux/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 */
  50unsigned int tipc_net_id __read_mostly;
  51int sysctl_tipc_rmem[3] __read_mostly;  /* min/default/max */
  52
  53static 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
  94out_bclink:
  95        tipc_nametbl_stop(net);
  96out_nametbl:
  97        tipc_sk_rht_destroy(net);
  98out_sk_rht:
  99
 100#ifdef CONFIG_TIPC_CRYPTO
 101        tipc_crypto_stop(&tn->crypto_tx);
 102out_crypto:
 103#endif
 104        return err;
 105}
 106
 107static 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
 126static void __net_exit tipc_pernet_pre_exit(struct net *net)
 127{
 128        tipc_node_pre_cleanup_net(net);
 129}
 130
 131static struct pernet_operations tipc_pernet_pre_exit_ops = {
 132        .pre_exit = tipc_pernet_pre_exit,
 133};
 134
 135static 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
 142static struct pernet_operations tipc_topsrv_net_ops = {
 143        .init = tipc_topsrv_init_net,
 144        .exit = tipc_topsrv_exit_net,
 145};
 146
 147static 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
 192out_netlink_compat:
 193        tipc_netlink_stop();
 194out_netlink:
 195        tipc_bearer_cleanup();
 196out_bearer:
 197        unregister_pernet_subsys(&tipc_pernet_pre_exit_ops);
 198out_register_pernet_subsys:
 199        unregister_pernet_device(&tipc_topsrv_net_ops);
 200out_pernet_topsrv:
 201        tipc_socket_stop();
 202out_socket:
 203        unregister_pernet_device(&tipc_net_ops);
 204out_pernet:
 205        tipc_unregister_sysctl();
 206out_sysctl:
 207        pr_err("Unable to start in single node mode\n");
 208        return err;
 209}
 210
 211static 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
 225module_init(tipc_init);
 226module_exit(tipc_exit);
 227
 228MODULE_DESCRIPTION("TIPC: Transparent Inter Process Communication");
 229MODULE_LICENSE("Dual BSD/GPL");
 230MODULE_VERSION(TIPC_MOD_VER);
 231