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 */
  50 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->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
  82 out_bclink:
  83         tipc_bcast_stop(net);
  84 out_subscr:
  85         tipc_nametbl_stop(net);
  86 out_nametbl:
  87         tipc_sk_rht_destroy(net);
  88 out_sk_rht:
  89         return err;
  90 }
  91
  92 static 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
 101 static 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
 108 static 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;
 146 out_bearer:
 147         unregister_pernet_subsys(&tipc_net_ops);
 148 out_pernet:
 149         tipc_unregister_sysctl();
 150 out_sysctl:
 151         tipc_socket_stop();
 152 out_socket:
 153         tipc_netlink_compat_stop();
 154 out_netlink_compat:
 155         tipc_netlink_stop();
 156 out_netlink:
 157         pr_err("Unable to start in single node mode\n");
 158         return err;
 159 }
 160
 161 static 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
 173 module_init(tipc_init);
 174 module_exit(tipc_exit);
 175
 176 MODULE_DESCRIPTION("TIPC: Transparent Inter Process Communication");
 177 MODULE_LICENSE("Dual BSD/GPL");
 178 MODULE_VERSION(TIPC_MOD_VER);