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  * 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