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 "config.h"
  43 #include "socket.h"
  44
  45 #include <linux/module.h>
  46
  47 /* configurable TIPC parameters */
  48 int tipc_net_id __read_mostly;
  49 int sysctl_tipc_rmem[3] __read_mostly;  /* min/default/max */
  50
  51 static int __net_init tipc_init_net(struct net *net)
  52 {
  53         struct tipc_net *tn = net_generic(net, tipc_net_id);
  54         int err;
  55
  56         tn->net_id = 4711;
  57         tn->own_addr = 0;
  58         get_random_bytes(&tn->random, sizeof(int));
  59         INIT_LIST_HEAD(&tn->node_list);
  60         spin_lock_init(&tn->node_list_lock);
  61
  62         err = tipc_sk_rht_init(net);
  63         if (err)
  64                 goto out_sk_rht;
  65
  66         err = tipc_nametbl_init(net);
  67         if (err)
  68                 goto out_nametbl;
  69
  70         err = tipc_subscr_start(net);
  71         if (err)
  72                 goto out_subscr;
  73         return 0;
  74
  75 out_subscr:
  76         tipc_nametbl_stop(net);
  77 out_nametbl:
  78         tipc_sk_rht_destroy(net);
  79 out_sk_rht:
  80         return err;
  81 }
  82
  83 static void __net_exit tipc_exit_net(struct net *net)
  84 {
  85         tipc_subscr_stop(net);
  86         tipc_net_stop(net);
  87         tipc_nametbl_stop(net);
  88         tipc_sk_rht_destroy(net);
  89 }
  90
  91 static struct pernet_operations tipc_net_ops = {
  92         .init = tipc_init_net,
  93         .exit = tipc_exit_net,
  94         .id   = &tipc_net_id,
  95         .size = sizeof(struct tipc_net),
  96 };
  97
  98 static int __init tipc_init(void)
  99 {
 100         int err;
 101
 102         pr_info("Activated (version " TIPC_MOD_VER ")\n");
 103
 104         sysctl_tipc_rmem[0] = TIPC_CONN_OVERLOAD_LIMIT >> 4 <<
 105                               TIPC_LOW_IMPORTANCE;
 106         sysctl_tipc_rmem[1] = TIPC_CONN_OVERLOAD_LIMIT >> 4 <<
 107                               TIPC_CRITICAL_IMPORTANCE;
 108         sysctl_tipc_rmem[2] = TIPC_CONN_OVERLOAD_LIMIT;
 109
 110         err = tipc_netlink_start();
 111         if (err)
 112                 goto out_netlink;
 113
 114         err = tipc_netlink_compat_start();
 115         if (err)
 116                 goto out_netlink_compat;
 117
 118         err = tipc_socket_init();
 119         if (err)
 120                 goto out_socket;
 121
 122         err = tipc_register_sysctl();
 123         if (err)
 124                 goto out_sysctl;
 125
 126         err = register_pernet_subsys(&tipc_net_ops);
 127         if (err)
 128                 goto out_pernet;
 129
 130         err = tipc_bearer_setup();
 131         if (err)
 132                 goto out_bearer;
 133
 134         pr_info("Started in single node mode\n");
 135         return 0;
 136 out_bearer:
 137         unregister_pernet_subsys(&tipc_net_ops);
 138 out_pernet:
 139         tipc_unregister_sysctl();
 140 out_sysctl:
 141         tipc_socket_stop();
 142 out_socket:
 143         tipc_netlink_compat_stop();
 144 out_netlink_compat:
 145         tipc_netlink_stop();
 146 out_netlink:
 147         pr_err("Unable to start in single node mode\n");
 148         return err;
 149 }
 150
 151 static void __exit tipc_exit(void)
 152 {
 153         tipc_bearer_cleanup();
 154         tipc_netlink_stop();
 155         tipc_netlink_compat_stop();
 156         tipc_socket_stop();
 157         tipc_unregister_sysctl();
 158         unregister_pernet_subsys(&tipc_net_ops);
 159
 160         pr_info("Deactivated\n");
 161 }
 162
 163 module_init(tipc_init);
 164 module_exit(tipc_exit);
 165
 166 MODULE_DESCRIPTION("TIPC: Transparent Inter Process Communication");
 167 MODULE_LICENSE("Dual BSD/GPL");
 168 MODULE_VERSION(TIPC_MOD_VER);