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
63struct tipc_node;
64struct tipc_bearer;
65struct tipc_bc_base;
66struct tipc_link;
67struct tipc_name_table;
68struct tipc_server;
69
70#define TIPC_MOD_VER "2.0.0"
71
72#define NODE_HTABLE_SIZE   512
73#define MAX_BEARERS	   3
74
75extern int tipc_net_id __read_mostly;
76extern int sysctl_tipc_rmem[3] __read_mostly;
77extern int sysctl_tipc_named_timeout __read_mostly;
78
79struct 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
111static inline struct tipc_net *tipc_net(struct net *net)
112{
113	return net_generic(net, tipc_net_id);
114}
115
116static inline int tipc_netid(struct net *net)
117{
118	return tipc_net(net)->net_id;
119}
120
121static inline u16 mod(u16 x)
122{
123	return x & 0xffffu;
124}
125
126static inline int less_eq(u16 left, u16 right)
127{
128	return mod(right - left) < 32768u;
129}
130
131static inline int more(u16 left, u16 right)
132{
133	return !less_eq(left, right);
134}
135
136static inline int less(u16 left, u16 right)
137{
138	return less_eq(left, right) && (mod(right) != mod(left));
139}
140
141static inline int in_range(u16 val, u16 min, u16 max)
142{
143	return !less(val, min) && !more(val, max);
144}
145
146#ifdef CONFIG_SYSCTL
147int tipc_register_sysctl(void);
148void tipc_unregister_sysctl(void);
149#else
150#define tipc_register_sysctl() 0
151#define tipc_unregister_sysctl()
152#endif
153#endif
154