net/tipc/core.h

   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 #include <net/netns/hash.h>
  63
  64 #ifdef pr_fmt
  65 #undef pr_fmt
  66 #endif
  67
  68 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  69
  70 struct tipc_node;
  71 struct tipc_bearer;
  72 struct tipc_bc_base;
  73 struct tipc_link;
  74 struct tipc_name_table;
  75 struct tipc_topsrv;
  76 struct tipc_monitor;
  77 #ifdef CONFIG_TIPC_CRYPTO
  78 struct tipc_crypto;
  79 #endif
  80
  81 #define TIPC_MOD_VER "2.0.0"
  82
  83 #define NODE_HTABLE_SIZE       512
  84 #define MAX_BEARERS              3
  85 #define TIPC_DEF_MON_THRESHOLD  32
  86 #define NODE_ID_LEN             16
  87 #define NODE_ID_STR_LEN        (NODE_ID_LEN * 2 + 1)
  88
  89 extern unsigned int tipc_net_id __read_mostly;
  90 extern int sysctl_tipc_rmem[3] __read_mostly;
  91 extern int sysctl_tipc_named_timeout __read_mostly;
  92
  93 struct tipc_net {
  94         u8  node_id[NODE_ID_LEN];
  95         u32 node_addr;
  96         u32 trial_addr;
  97         unsigned long addr_trial_end;
  98         char node_id_string[NODE_ID_STR_LEN];
  99         int net_id;
 100         int random;
 101         bool legacy_addr_format;
 102
 103         /* Node table and node list */
 104         spinlock_t node_list_lock;
 105         struct hlist_head node_htable[NODE_HTABLE_SIZE];
 106         struct list_head node_list;
 107         u32 num_nodes;
 108         u32 num_links;
 109
 110         /* Neighbor monitoring list */
 111         struct tipc_monitor *monitors[MAX_BEARERS];
 112         int mon_threshold;
 113
 114         /* Bearer list */
 115         struct tipc_bearer __rcu *bearer_list[MAX_BEARERS + 1];
 116
 117         /* Broadcast link */
 118         spinlock_t bclock;
 119         struct tipc_bc_base *bcbase;
 120         struct tipc_link *bcl;
 121
 122         /* Socket hash table */
 123         struct rhashtable sk_rht;
 124
 125         /* Name table */
 126         spinlock_t nametbl_lock;
 127         struct name_table *nametbl;
 128
 129         /* Name dist queue */
 130         struct list_head dist_queue;
 131
 132         /* Topology subscription server */
 133         struct tipc_topsrv *topsrv;
 134         atomic_t subscription_count;
 135
 136         /* Cluster capabilities */
 137         u16 capabilities;
 138
 139         /* Tracing of node internal messages */
 140         struct packet_type loopback_pt;
 141
 142 #ifdef CONFIG_TIPC_CRYPTO
 143         /* TX crypto handler */
 144         struct tipc_crypto *crypto_tx;
 145 #endif
 146 };
 147
 148 static inline struct tipc_net *tipc_net(struct net *net)
 149 {
 150         return net_generic(net, tipc_net_id);
 151 }
 152
 153 static inline int tipc_netid(struct net *net)
 154 {
 155         return tipc_net(net)->net_id;
 156 }
 157
 158 static inline struct list_head *tipc_nodes(struct net *net)
 159 {
 160         return &tipc_net(net)->node_list;
 161 }
 162
 163 static inline struct name_table *tipc_name_table(struct net *net)
 164 {
 165         return tipc_net(net)->nametbl;
 166 }
 167
 168 static inline struct tipc_topsrv *tipc_topsrv(struct net *net)
 169 {
 170         return tipc_net(net)->topsrv;
 171 }
 172
 173 static inline unsigned int tipc_hashfn(u32 addr)
 174 {
 175         return addr & (NODE_HTABLE_SIZE - 1);
 176 }
 177
 178 static inline u16 mod(u16 x)
 179 {
 180         return x & 0xffffu;
 181 }
 182
 183 static inline int less_eq(u16 left, u16 right)
 184 {
 185         return mod(right - left) < 32768u;
 186 }
 187
 188 static inline int more(u16 left, u16 right)
 189 {
 190         return !less_eq(left, right);
 191 }
 192
 193 static inline int less(u16 left, u16 right)
 194 {
 195         return less_eq(left, right) && (mod(right) != mod(left));
 196 }
 197
 198 static inline int in_range(u16 val, u16 min, u16 max)
 199 {
 200         return !less(val, min) && !more(val, max);
 201 }
 202
 203 static inline u32 tipc_net_hash_mixes(struct net *net, int tn_rand)
 204 {
 205         return net_hash_mix(&init_net) ^ net_hash_mix(net) ^ tn_rand;
 206 }
 207
 208 #ifdef CONFIG_SYSCTL
 209 int tipc_register_sysctl(void);
 210 void tipc_unregister_sysctl(void);
 211 #else
 212 #define tipc_register_sysctl() 0
 213 #define tipc_unregister_sysctl()
 214 #endif
 215 #endif