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 "config.h"
  41 #include "socket.h"
  42
  43 #include <linux/module.h>
  44
  45 /* global variables used by multiple sub-systems within TIPC */
  46 int tipc_random __read_mostly;
  47
  48 /* configurable TIPC parameters */
  49 u32 tipc_own_addr __read_mostly;
  50 int tipc_max_ports __read_mostly;
  51 int tipc_net_id __read_mostly;
  52 int sysctl_tipc_rmem[3] __read_mostly;  /* min/default/max */
  53
  54 /**
  55  * tipc_buf_acquire - creates a TIPC message buffer
  56  * @size: message size (including TIPC header)
  57  *
  58  * Returns a new buffer with data pointers set to the specified size.
  59  *
  60  * NOTE: Headroom is reserved to allow prepending of a data link header.
  61  *       There may also be unrequested tailroom present at the buffer's end.
  62  */
  63 struct sk_buff *tipc_buf_acquire(u32 size)
  64 {
  65         struct sk_buff *skb;
  66         unsigned int buf_size = (BUF_HEADROOM + size + 3) & ~3u;
  67
  68         skb = alloc_skb_fclone(buf_size, GFP_ATOMIC);
  69         if (skb) {
  70                 skb_reserve(skb, BUF_HEADROOM);
  71                 skb_put(skb, size);
  72                 skb->next = NULL;
  73         }
  74         return skb;
  75 }
  76
  77 /**
  78  * tipc_core_stop - switch TIPC from SINGLE NODE to NOT RUNNING mode
  79  */
  80 static void tipc_core_stop(void)
  81 {
  82         tipc_net_stop();
  83         tipc_bearer_cleanup();
  84         tipc_netlink_stop();
  85         tipc_subscr_stop();
  86         tipc_nametbl_stop();
  87         tipc_sk_ref_table_stop();
  88         tipc_socket_stop();
  89         tipc_unregister_sysctl();
  90 }
  91
  92 /**
  93  * tipc_core_start - switch TIPC from NOT RUNNING to SINGLE NODE mode
  94  */
  95 static int tipc_core_start(void)
  96 {
  97         int err;
  98
  99         get_random_bytes(&tipc_random, sizeof(tipc_random));
 100
 101         err = tipc_sk_ref_table_init(tipc_max_ports, tipc_random);
 102         if (err)
 103                 goto out_reftbl;
 104
 105         err = tipc_nametbl_init();
 106         if (err)
 107                 goto out_nametbl;
 108
 109         err = tipc_netlink_start();
 110         if (err)
 111                 goto out_netlink;
 112
 113         err = tipc_socket_init();
 114         if (err)
 115                 goto out_socket;
 116
 117         err = tipc_register_sysctl();
 118         if (err)
 119                 goto out_sysctl;
 120
 121         err = tipc_subscr_start();
 122         if (err)
 123                 goto out_subscr;
 124
 125         err = tipc_bearer_setup();
 126         if (err)
 127                 goto out_bearer;
 128
 129         return 0;
 130 out_bearer:
 131         tipc_subscr_stop();
 132 out_subscr:
 133         tipc_unregister_sysctl();
 134 out_sysctl:
 135         tipc_socket_stop();
 136 out_socket:
 137         tipc_netlink_stop();
 138 out_netlink:
 139         tipc_nametbl_stop();
 140 out_nametbl:
 141         tipc_sk_ref_table_stop();
 142 out_reftbl:
 143         return err;
 144 }
 145
 146 static int __init tipc_init(void)
 147 {
 148         int res;
 149
 150         pr_info("Activated (version " TIPC_MOD_VER ")\n");
 151
 152         tipc_own_addr = 0;
 153         tipc_max_ports = CONFIG_TIPC_PORTS;
 154         tipc_net_id = 4711;
 155
 156         sysctl_tipc_rmem[0] = TIPC_CONN_OVERLOAD_LIMIT >> 4 <<
 157                               TIPC_LOW_IMPORTANCE;
 158         sysctl_tipc_rmem[1] = TIPC_CONN_OVERLOAD_LIMIT >> 4 <<
 159                               TIPC_CRITICAL_IMPORTANCE;
 160         sysctl_tipc_rmem[2] = TIPC_CONN_OVERLOAD_LIMIT;
 161
 162         res = tipc_core_start();
 163         if (res)
 164                 pr_err("Unable to start in single node mode\n");
 165         else
 166                 pr_info("Started in single node mode\n");
 167         return res;
 168 }
 169
 170 static void __exit tipc_exit(void)
 171 {
 172         tipc_core_stop();
 173         pr_info("Deactivated\n");
 174 }
 175
 176 module_init(tipc_init);
 177 module_exit(tipc_exit);
 178
 179 MODULE_DESCRIPTION("TIPC: Transparent Inter Process Communication");
 180 MODULE_LICENSE("Dual BSD/GPL");
 181 MODULE_VERSION(TIPC_MOD_VER);