xref: /openbmc/linux/net/tipc/core.h (revision dfe94d40)
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_work {
95 	struct work_struct work;
96 	struct net *net;
97 	u32 addr;
98 };
99 
100 struct tipc_net {
101 	u8  node_id[NODE_ID_LEN];
102 	u32 node_addr;
103 	u32 trial_addr;
104 	unsigned long addr_trial_end;
105 	char node_id_string[NODE_ID_STR_LEN];
106 	int net_id;
107 	int random;
108 	bool legacy_addr_format;
109 
110 	/* Node table and node list */
111 	spinlock_t node_list_lock;
112 	struct hlist_head node_htable[NODE_HTABLE_SIZE];
113 	struct list_head node_list;
114 	u32 num_nodes;
115 	u32 num_links;
116 
117 	/* Neighbor monitoring list */
118 	struct tipc_monitor *monitors[MAX_BEARERS];
119 	int mon_threshold;
120 
121 	/* Bearer list */
122 	struct tipc_bearer __rcu *bearer_list[MAX_BEARERS + 1];
123 
124 	/* Broadcast link */
125 	spinlock_t bclock;
126 	struct tipc_bc_base *bcbase;
127 	struct tipc_link *bcl;
128 
129 	/* Socket hash table */
130 	struct rhashtable sk_rht;
131 
132 	/* Name table */
133 	spinlock_t nametbl_lock;
134 	struct name_table *nametbl;
135 
136 	/* Topology subscription server */
137 	struct tipc_topsrv *topsrv;
138 	atomic_t subscription_count;
139 
140 	/* Cluster capabilities */
141 	u16 capabilities;
142 
143 	/* Tracing of node internal messages */
144 	struct packet_type loopback_pt;
145 
146 #ifdef CONFIG_TIPC_CRYPTO
147 	/* TX crypto handler */
148 	struct tipc_crypto *crypto_tx;
149 #endif
150 	/* Work item for net finalize */
151 	struct tipc_net_work final_work;
152 };
153 
154 static inline struct tipc_net *tipc_net(struct net *net)
155 {
156 	return net_generic(net, tipc_net_id);
157 }
158 
159 static inline int tipc_netid(struct net *net)
160 {
161 	return tipc_net(net)->net_id;
162 }
163 
164 static inline struct list_head *tipc_nodes(struct net *net)
165 {
166 	return &tipc_net(net)->node_list;
167 }
168 
169 static inline struct name_table *tipc_name_table(struct net *net)
170 {
171 	return tipc_net(net)->nametbl;
172 }
173 
174 static inline struct tipc_topsrv *tipc_topsrv(struct net *net)
175 {
176 	return tipc_net(net)->topsrv;
177 }
178 
179 static inline unsigned int tipc_hashfn(u32 addr)
180 {
181 	return addr & (NODE_HTABLE_SIZE - 1);
182 }
183 
184 static inline u16 mod(u16 x)
185 {
186 	return x & 0xffffu;
187 }
188 
189 static inline int less_eq(u16 left, u16 right)
190 {
191 	return mod(right - left) < 32768u;
192 }
193 
194 static inline int more(u16 left, u16 right)
195 {
196 	return !less_eq(left, right);
197 }
198 
199 static inline int less(u16 left, u16 right)
200 {
201 	return less_eq(left, right) && (mod(right) != mod(left));
202 }
203 
204 static inline int in_range(u16 val, u16 min, u16 max)
205 {
206 	return !less(val, min) && !more(val, max);
207 }
208 
209 static inline u32 tipc_net_hash_mixes(struct net *net, int tn_rand)
210 {
211 	return net_hash_mix(&init_net) ^ net_hash_mix(net) ^ tn_rand;
212 }
213 
214 static inline u32 hash128to32(char *bytes)
215 {
216 	__be32 *tmp = (__be32 *)bytes;
217 	u32 res;
218 
219 	res = ntohl(tmp[0] ^ tmp[1] ^ tmp[2] ^ tmp[3]);
220 	if (likely(res))
221 		return res;
222 	return  ntohl(tmp[0] | tmp[1] | tmp[2] | tmp[3]);
223 }
224 
225 #ifdef CONFIG_SYSCTL
226 int tipc_register_sysctl(void);
227 void tipc_unregister_sysctl(void);
228 #else
229 #define tipc_register_sysctl() 0
230 #define tipc_unregister_sysctl()
231 #endif
232 #endif
233