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