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1/*
2 * net/tipc/core.h: Include file for TIPC global declarations
3 *
4 * Copyright (c) 2005-2006, 2013-2018 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 <linux/netdevice.h>
53#include <linux/in.h>
54#include <linux/list.h>
55#include <linux/slab.h>
56#include <linux/vmalloc.h>
57#include <linux/rtnetlink.h>
58#include <linux/etherdevice.h>
59#include <net/netns/generic.h>
60#include <linux/rhashtable.h>
61#include <net/genetlink.h>
62
63struct tipc_node;
64struct tipc_bearer;
65struct tipc_bc_base;
66struct tipc_link;
67struct tipc_name_table;
68struct tipc_topsrv;
69struct tipc_monitor;
70
71#define TIPC_MOD_VER "2.0.0"
72
73#define NODE_HTABLE_SIZE 512
74#define MAX_BEARERS 3
75#define TIPC_DEF_MON_THRESHOLD 32
76#define NODE_ID_LEN 16
77#define NODE_ID_STR_LEN (NODE_ID_LEN * 2 + 1)
78
79extern unsigned int tipc_net_id __read_mostly;
80extern int sysctl_tipc_rmem[3] __read_mostly;
81extern int sysctl_tipc_named_timeout __read_mostly;
82
83struct tipc_net {
84 u8 node_id[NODE_ID_LEN];
85 u32 node_addr;
86 u32 trial_addr;
87 unsigned long addr_trial_end;
88 char node_id_string[NODE_ID_STR_LEN];
89 int net_id;
90 int random;
91 bool legacy_addr_format;
92
93 /* Node table and node list */
94 spinlock_t node_list_lock;
95 struct hlist_head node_htable[NODE_HTABLE_SIZE];
96 struct list_head node_list;
97 u32 num_nodes;
98 u32 num_links;
99
100 /* Neighbor monitoring list */
101 struct tipc_monitor *monitors[MAX_BEARERS];
102 int mon_threshold;
103
104 /* Bearer list */
105 struct tipc_bearer __rcu *bearer_list[MAX_BEARERS + 1];
106
107 /* Broadcast link */
108 spinlock_t bclock;
109 struct tipc_bc_base *bcbase;
110 struct tipc_link *bcl;
111
112 /* Socket hash table */
113 struct rhashtable sk_rht;
114
115 /* Name table */
116 spinlock_t nametbl_lock;
117 struct name_table *nametbl;
118
119 /* Name dist queue */
120 struct list_head dist_queue;
121
122 /* Topology subscription server */
123 struct tipc_topsrv *topsrv;
124 atomic_t subscription_count;
125
126 /* Cluster capabilities */
127 u16 capabilities;
128
129 /* Tracing of node internal messages */
130 struct packet_type loopback_pt;
131};
132
133static inline struct tipc_net *tipc_net(struct net *net)
134{
135 return net_generic(net, tipc_net_id);
136}
137
138static inline int tipc_netid(struct net *net)
139{
140 return tipc_net(net)->net_id;
141}
142
143static inline struct list_head *tipc_nodes(struct net *net)
144{
145 return &tipc_net(net)->node_list;
146}
147
148static inline struct name_table *tipc_name_table(struct net *net)
149{
150 return tipc_net(net)->nametbl;
151}
152
153static inline struct tipc_topsrv *tipc_topsrv(struct net *net)
154{
155 return tipc_net(net)->topsrv;
156}
157
158static inline unsigned int tipc_hashfn(u32 addr)
159{
160 return addr & (NODE_HTABLE_SIZE - 1);
161}
162
163static inline u16 mod(u16 x)
164{
165 return x & 0xffffu;
166}
167
168static inline int less_eq(u16 left, u16 right)
169{
170 return mod(right - left) < 32768u;
171}
172
173static inline int more(u16 left, u16 right)
174{
175 return !less_eq(left, right);
176}
177
178static inline int less(u16 left, u16 right)
179{
180 return less_eq(left, right) && (mod(right) != mod(left));
181}
182
183static inline int in_range(u16 val, u16 min, u16 max)
184{
185 return !less(val, min) && !more(val, max);
186}
187
188#ifdef CONFIG_SYSCTL
189int tipc_register_sysctl(void);
190void tipc_unregister_sysctl(void);
191#else
192#define tipc_register_sysctl() 0
193#define tipc_unregister_sysctl()
194#endif
195#endif