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_bc_base;
  66 struct tipc_link;
  67 struct tipc_name_table;
  68 struct tipc_server;
  69
  70 #define TIPC_MOD_VER "2.0.0"
  71
  72 #define NODE_HTABLE_SIZE   512
  73 #define MAX_BEARERS        3
  74
  75 extern int tipc_net_id __read_mostly;
  76 extern int sysctl_tipc_rmem[3] __read_mostly;
  77 extern int sysctl_tipc_named_timeout __read_mostly;
  78
  79 struct tipc_net {
  80         u32 own_addr;
  81         int net_id;
  82         int random;
  83
  84         /* Node table and node list */
  85         spinlock_t node_list_lock;
  86         struct hlist_head node_htable[NODE_HTABLE_SIZE];
  87         struct list_head node_list;
  88         u32 num_nodes;
  89         u32 num_links;
  90
  91         /* Bearer list */
  92         struct tipc_bearer __rcu *bearer_list[MAX_BEARERS + 1];
  93
  94         /* Broadcast link */
  95         spinlock_t bclock;
  96         struct tipc_bc_base *bcbase;
  97         struct tipc_link *bcl;
  98
  99         /* Socket hash table */
 100         struct rhashtable sk_rht;
 101
 102         /* Name table */
 103         spinlock_t nametbl_lock;
 104         struct name_table *nametbl;
 105
 106         /* Topology subscription server */
 107         struct tipc_server *topsrv;
 108         atomic_t subscription_count;
 109 };
 110
 111 static inline struct tipc_net *tipc_net(struct net *net)
 112 {
 113         return net_generic(net, tipc_net_id);
 114 }
 115
 116 static inline int tipc_netid(struct net *net)
 117 {
 118         return tipc_net(net)->net_id;
 119 }
 120
 121 static inline struct list_head *tipc_nodes(struct net *net)
 122 {
 123         return &tipc_net(net)->node_list;
 124 }
 125
 126 static inline u16 mod(u16 x)
 127 {
 128         return x & 0xffffu;
 129 }
 130
 131 static inline int less_eq(u16 left, u16 right)
 132 {
 133         return mod(right - left) < 32768u;
 134 }
 135
 136 static inline int more(u16 left, u16 right)
 137 {
 138         return !less_eq(left, right);
 139 }
 140
 141 static inline int less(u16 left, u16 right)
 142 {
 143         return less_eq(left, right) && (mod(right) != mod(left));
 144 }
 145
 146 static inline int in_range(u16 val, u16 min, u16 max)
 147 {
 148         return !less(val, min) && !more(val, max);
 149 }
 150
 151 #ifdef CONFIG_SYSCTL
 152 int tipc_register_sysctl(void);
 153 void tipc_unregister_sysctl(void);
 154 #else
 155 #define tipc_register_sysctl() 0
 156 #define tipc_unregister_sysctl()
 157 #endif
 158 #endif