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 * Copyright (c) 2020, Red Hat Inc
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the names of the copyright holders nor the names of its
18 * contributors may be used to endorse or promote products derived from
19 * this software without specific prior written permission.
20 *
21 * Alternatively, this software may be distributed under the terms of the
22 * GNU General Public License ("GPL") version 2 as published by the Free
23 * Software Foundation.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
26 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
29 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35 * POSSIBILITY OF SUCH DAMAGE.
36 */
37
38 #ifndef _TIPC_CORE_H
39 #define _TIPC_CORE_H
40
41 #include <linux/tipc.h>
42 #include <linux/tipc_config.h>
43 #include <linux/tipc_netlink.h>
44 #include <linux/types.h>
45 #include <linux/kernel.h>
46 #include <linux/errno.h>
47 #include <linux/mm.h>
48 #include <linux/timer.h>
49 #include <linux/string.h>
50 #include <linux/uaccess.h>
51 #include <linux/interrupt.h>
52 #include <linux/atomic.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 #include <net/genetlink.h>
63 #include <net/netns/hash.h>
64
65 #ifdef pr_fmt
66 #undef pr_fmt
67 #endif
68
69 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
70
71 struct tipc_node;
72 struct tipc_bearer;
73 struct tipc_bc_base;
74 struct tipc_link;
75 struct tipc_name_table;
76 struct tipc_topsrv;
77 struct tipc_monitor;
78 #ifdef CONFIG_TIPC_CRYPTO
79 struct tipc_crypto;
80 #endif
81
82 #define TIPC_MOD_VER "2.0.0"
83
84 #define NODE_HTABLE_SIZE 512
85 #define MAX_BEARERS 3
86 #define TIPC_DEF_MON_THRESHOLD 32
87 #define NODE_ID_LEN 16
88 #define NODE_ID_STR_LEN (NODE_ID_LEN * 2 + 1)
89
90 extern unsigned int tipc_net_id __read_mostly;
91 extern int sysctl_tipc_rmem[3] __read_mostly;
92 extern int sysctl_tipc_named_timeout __read_mostly;
93
94 struct tipc_net {
95 u8 node_id[NODE_ID_LEN];
96 u32 node_addr;
97 u32 trial_addr;
98 unsigned long addr_trial_end;
99 char node_id_string[NODE_ID_STR_LEN];
100 int net_id;
101 int random;
102 bool legacy_addr_format;
103
104 /* Node table and node list */
105 spinlock_t node_list_lock;
106 struct hlist_head node_htable[NODE_HTABLE_SIZE];
107 struct list_head node_list;
108 u32 num_nodes;
109 u32 num_links;
110
111 /* Neighbor monitoring list */
112 struct tipc_monitor *monitors[MAX_BEARERS];
113 int mon_threshold;
114
115 /* Bearer list */
116 struct tipc_bearer __rcu *bearer_list[MAX_BEARERS + 1];
117
118 /* Broadcast link */
119 spinlock_t bclock;
120 struct tipc_bc_base *bcbase;
121 struct tipc_link *bcl;
122
123 /* Socket hash table */
124 struct rhashtable sk_rht;
125
126 /* Name table */
127 spinlock_t nametbl_lock;
128 struct name_table *nametbl;
129
130 /* Topology subscription server */
131 struct tipc_topsrv *topsrv;
132 atomic_t subscription_count;
133
134 /* Cluster capabilities */
135 u16 capabilities;
136
137 /* Tracing of node internal messages */
138 struct packet_type loopback_pt;
139
140 #ifdef CONFIG_TIPC_CRYPTO
141 /* TX crypto handler */
142 struct tipc_crypto *crypto_tx;
143 #endif
144 /* Work item for net finalize */
145 struct work_struct work;
146 /* The numbers of work queues in schedule */
147 atomic_t wq_count;
148 };
149
tipc_net(struct net * net)150 static inline struct tipc_net *tipc_net(struct net *net)
151 {
152 return net_generic(net, tipc_net_id);
153 }
154
tipc_netid(struct net * net)155 static inline int tipc_netid(struct net *net)
156 {
157 return tipc_net(net)->net_id;
158 }
159
tipc_nodes(struct net * net)160 static inline struct list_head *tipc_nodes(struct net *net)
161 {
162 return &tipc_net(net)->node_list;
163 }
164
tipc_name_table(struct net * net)165 static inline struct name_table *tipc_name_table(struct net *net)
166 {
167 return tipc_net(net)->nametbl;
168 }
169
tipc_topsrv(struct net * net)170 static inline struct tipc_topsrv *tipc_topsrv(struct net *net)
171 {
172 return tipc_net(net)->topsrv;
173 }
174
tipc_hashfn(u32 addr)175 static inline unsigned int tipc_hashfn(u32 addr)
176 {
177 return addr & (NODE_HTABLE_SIZE - 1);
178 }
179
mod(u16 x)180 static inline u16 mod(u16 x)
181 {
182 return x & 0xffffu;
183 }
184
less_eq(u16 left,u16 right)185 static inline int less_eq(u16 left, u16 right)
186 {
187 return mod(right - left) < 32768u;
188 }
189
more(u16 left,u16 right)190 static inline int more(u16 left, u16 right)
191 {
192 return !less_eq(left, right);
193 }
194
less(u16 left,u16 right)195 static inline int less(u16 left, u16 right)
196 {
197 return less_eq(left, right) && (mod(right) != mod(left));
198 }
199
tipc_in_range(u16 val,u16 min,u16 max)200 static inline int tipc_in_range(u16 val, u16 min, u16 max)
201 {
202 return !less(val, min) && !more(val, max);
203 }
204
tipc_net_hash_mixes(struct net * net,int tn_rand)205 static inline u32 tipc_net_hash_mixes(struct net *net, int tn_rand)
206 {
207 return net_hash_mix(&init_net) ^ net_hash_mix(net) ^ tn_rand;
208 }
209
hash128to32(char * bytes)210 static inline u32 hash128to32(char *bytes)
211 {
212 __be32 *tmp = (__be32 *)bytes;
213 u32 res;
214
215 res = ntohl(tmp[0] ^ tmp[1] ^ tmp[2] ^ tmp[3]);
216 if (likely(res))
217 return res;
218 return ntohl(tmp[0] | tmp[1] | tmp[2] | tmp[3]);
219 }
220
221 #ifdef CONFIG_SYSCTL
222 int tipc_register_sysctl(void);
223 void tipc_unregister_sysctl(void);
224 #else
225 #define tipc_register_sysctl() 0
226 #define tipc_unregister_sysctl()
227 #endif
228 #endif
229