net/tipc/core.h

   1 /*
   2  * net/tipc/core.h: Include file for TIPC global declarations
   3  *
   4  * Copyright (c) 2005-2006, 2013 Ericsson AB
   5  * Copyright (c) 2005-2007, 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 #ifndef _TIPC_CORE_H
  38 #define _TIPC_CORE_H
  39
  40 #include <linux/tipc.h>
  41 #include <linux/tipc_config.h>
  42 #include <linux/tipc_netlink.h>
  43 #include <linux/types.h>
  44 #include <linux/kernel.h>
  45 #include <linux/errno.h>
  46 #include <linux/mm.h>
  47 #include <linux/timer.h>
  48 #include <linux/string.h>
  49 #include <linux/uaccess.h>
  50 #include <linux/interrupt.h>
  51 #include <linux/atomic.h>
  52 #include <asm/hardirq.h>
  53 #include <linux/netdevice.h>
  54 #include <linux/in.h>
  55 #include <linux/list.h>
  56 #include <linux/slab.h>
  57 #include <linux/vmalloc.h>
  58 #include <linux/rtnetlink.h>
  59 #include <linux/etherdevice.h>
  60 #include <net/netns/generic.h>
  61 #include <linux/rhashtable.h>
  62
  63 struct tipc_node;
  64 struct tipc_bearer;
  65 struct tipc_bcbearer;
  66 struct tipc_bclink;
  67 struct tipc_link;
  68 struct tipc_name_table;
  69 struct tipc_server;
  70
  71 #define TIPC_MOD_VER "2.0.0"
  72
  73 #define NODE_HTABLE_SIZE   512
  74 #define MAX_BEARERS        3
  75
  76 extern int tipc_net_id __read_mostly;
  77 extern int sysctl_tipc_rmem[3] __read_mostly;
  78 extern int sysctl_tipc_named_timeout __read_mostly;
  79
  80 struct tipc_net {
  81         u32 own_addr;
  82         int net_id;
  83         int random;
  84
  85         /* Node table and node list */
  86         spinlock_t node_list_lock;
  87         struct hlist_head node_htable[NODE_HTABLE_SIZE];
  88         struct list_head node_list;
  89         u32 num_nodes;
  90         u32 num_links;
  91
  92         /* Bearer list */
  93         struct tipc_bearer __rcu *bearer_list[MAX_BEARERS + 1];
  94
  95         /* Broadcast link */
  96         struct tipc_bcbearer *bcbearer;
  97         struct tipc_bclink *bclink;
  98         struct tipc_link *bcl;
  99
 100         /* Socket hash table */
 101         struct rhashtable sk_rht;
 102
 103         /* Name table */
 104         spinlock_t nametbl_lock;
 105         struct name_table *nametbl;
 106
 107         /* Topology subscription server */
 108         struct tipc_server *topsrv;
 109         atomic_t subscription_count;
 110 };
 111
 112 static inline u16 mod(u16 x)
 113 {
 114         return x & 0xffffu;
 115 }
 116
 117 static inline int less_eq(u16 left, u16 right)
 118 {
 119         return mod(right - left) < 32768u;
 120 }
 121
 122 static inline int more(u16 left, u16 right)
 123 {
 124         return !less_eq(left, right);
 125 }
 126
 127 static inline int less(u16 left, u16 right)
 128 {
 129         return less_eq(left, right) && (mod(right) != mod(left));
 130 }
 131
 132 #ifdef CONFIG_SYSCTL
 133 int tipc_register_sysctl(void);
 134 void tipc_unregister_sysctl(void);
 135 #else
 136 #define tipc_register_sysctl() 0
 137 #define tipc_unregister_sysctl()
 138 #endif
 139 #endif