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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  38
  39#include "core.h"
  40#include "name_table.h"
  41#include "subscr.h"
  42#include "bearer.h"
  43#include "net.h"
  44#include "socket.h"
  45#include "bcast.h"
  46
  47#include <linux/module.h>
  48
  49/* configurable TIPC parameters */
  50int 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->own_addr = 0;
  60        get_random_bytes(&tn->random, sizeof(int));
  61        INIT_LIST_HEAD(&tn->node_list);
  62        spin_lock_init(&tn->node_list_lock);
  63
  64        err = tipc_sk_rht_init(net);
  65        if (err)
  66                goto out_sk_rht;
  67
  68        err = tipc_nametbl_init(net);
  69        if (err)
  70                goto out_nametbl;
  71
  72        err = tipc_topsrv_start(net);
  73        if (err)
  74                goto out_subscr;
  75
  76        err = tipc_bcast_init(net);
  77        if (err)
  78                goto out_bclink;
  79
  80        return 0;
  81
  82out_bclink:
  83        tipc_bcast_stop(net);
  84out_subscr:
  85        tipc_nametbl_stop(net);
  86out_nametbl:
  87        tipc_sk_rht_destroy(net);
  88out_sk_rht:
  89        return err;
  90}
  91
  92static void __net_exit tipc_exit_net(struct net *net)
  93{
  94        tipc_topsrv_stop(net);
  95        tipc_net_stop(net);
  96        tipc_bcast_stop(net);
  97        tipc_nametbl_stop(net);
  98        tipc_sk_rht_destroy(net);
  99}
 100
 101static struct pernet_operations tipc_net_ops = {
 102        .init = tipc_init_net,
 103        .exit = tipc_exit_net,
 104        .id   = &tipc_net_id,
 105        .size = sizeof(struct tipc_net),
 106};
 107
 108static int __init tipc_init(void)
 109{
 110        int err;
 111
 112        pr_info("Activated (version " TIPC_MOD_VER ")\n");
 113
 114        sysctl_tipc_rmem[0] = TIPC_CONN_OVERLOAD_LIMIT >> 4 <<
 115                              TIPC_LOW_IMPORTANCE;
 116        sysctl_tipc_rmem[1] = TIPC_CONN_OVERLOAD_LIMIT >> 4 <<
 117                              TIPC_CRITICAL_IMPORTANCE;
 118        sysctl_tipc_rmem[2] = TIPC_CONN_OVERLOAD_LIMIT;
 119
 120        err = tipc_netlink_start();
 121        if (err)
 122                goto out_netlink;
 123
 124        err = tipc_netlink_compat_start();
 125        if (err)
 126                goto out_netlink_compat;
 127
 128        err = tipc_socket_init();
 129        if (err)
 130                goto out_socket;
 131
 132        err = tipc_register_sysctl();
 133        if (err)
 134                goto out_sysctl;
 135
 136        err = register_pernet_subsys(&tipc_net_ops);
 137        if (err)
 138                goto out_pernet;
 139
 140        err = tipc_bearer_setup();
 141        if (err)
 142                goto out_bearer;
 143
 144        pr_info("Started in single node mode\n");
 145        return 0;
 146out_bearer:
 147        unregister_pernet_subsys(&tipc_net_ops);
 148out_pernet:
 149        tipc_unregister_sysctl();
 150out_sysctl:
 151        tipc_socket_stop();
 152out_socket:
 153        tipc_netlink_compat_stop();
 154out_netlink_compat:
 155        tipc_netlink_stop();
 156out_netlink:
 157        pr_err("Unable to start in single node mode\n");
 158        return err;
 159}
 160
 161static void __exit tipc_exit(void)
 162{
 163        tipc_bearer_cleanup();
 164        unregister_pernet_subsys(&tipc_net_ops);
 165        tipc_netlink_stop();
 166        tipc_netlink_compat_stop();
 167        tipc_socket_stop();
 168        tipc_unregister_sysctl();
 169
 170        pr_info("Deactivated\n");
 171}
 172
 173module_init(tipc_init);
 174module_exit(tipc_exit);
 175
 176MODULE_DESCRIPTION("TIPC: Transparent Inter Process Communication");
 177MODULE_LICENSE("Dual BSD/GPL");
 178MODULE_VERSION(TIPC_MOD_VER);
 179