net/tipc/core.h

   1 /*
   2  * net/tipc/core.h: Include file for TIPC global declarations
   3  *
   4  * Copyright (c) 2005-2006, Ericsson AB
   5  * Copyright (c) 2005-2007, 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 <net/tipc/tipc_msg.h>
  43 #include <net/tipc/tipc_port.h>
  44 #include <net/tipc/tipc_bearer.h>
  45 #include <net/tipc/tipc.h>
  46 #include <linux/types.h>
  47 #include <linux/kernel.h>
  48 #include <linux/errno.h>
  49 #include <linux/mm.h>
  50 #include <linux/timer.h>
  51 #include <linux/string.h>
  52 #include <asm/uaccess.h>
  53 #include <linux/interrupt.h>
  54 #include <asm/atomic.h>
  55 #include <asm/hardirq.h>
  56 #include <linux/netdevice.h>
  57 #include <linux/in.h>
  58 #include <linux/list.h>
  59 #include <linux/slab.h>
  60 #include <linux/vmalloc.h>
  61
  62
  63 #define TIPC_MOD_VER "2.0.0"
  64
  65 /*
  66  * TIPC sanity test macros
  67  */
  68
  69 #define assert(i)  BUG_ON(!(i))
  70
  71 /*
  72  * TIPC system monitoring code
  73  */
  74
  75 /*
  76  * TIPC's print buffer subsystem supports the following print buffers:
  77  *
  78  * TIPC_NULL : null buffer (i.e. print nowhere)
  79  * TIPC_CONS : system console
  80  * TIPC_LOG  : TIPC log buffer
  81  * &buf      : user-defined buffer (struct print_buf *)
  82  *
  83  * Note: TIPC_LOG is configured to echo its output to the system console;
  84  *       user-defined buffers can be configured to do the same thing.
  85  */
  86 extern struct print_buf *const TIPC_NULL;
  87 extern struct print_buf *const TIPC_LOG;
  88
  89 void tipc_printf(struct print_buf *, const char *fmt, ...);
  90
  91 /*
  92  * TIPC_OUTPUT is the destination print buffer for system messages.
  93  */
  94
  95 #ifndef TIPC_OUTPUT
  96 #define TIPC_OUTPUT TIPC_LOG
  97 #endif
  98
  99 /*
 100  * TIPC can be configured to send system messages to TIPC_OUTPUT
 101  * or to the system console only.
 102  */
 103
 104 #ifdef CONFIG_TIPC_DEBUG
 105
 106 #define err(fmt, arg...)  tipc_printf(TIPC_OUTPUT, \
 107                                         KERN_ERR "TIPC: " fmt, ## arg)
 108 #define warn(fmt, arg...) tipc_printf(TIPC_OUTPUT, \
 109                                         KERN_WARNING "TIPC: " fmt, ## arg)
 110 #define info(fmt, arg...) tipc_printf(TIPC_OUTPUT, \
 111                                         KERN_NOTICE "TIPC: " fmt, ## arg)
 112
 113 #else
 114
 115 #define err(fmt, arg...)  printk(KERN_ERR "TIPC: " fmt , ## arg)
 116 #define info(fmt, arg...) printk(KERN_INFO "TIPC: " fmt , ## arg)
 117 #define warn(fmt, arg...) printk(KERN_WARNING "TIPC: " fmt , ## arg)
 118
 119 #endif
 120
 121 /*
 122  * DBG_OUTPUT is the destination print buffer for debug messages.
 123  * It defaults to the the null print buffer, but can be redefined
 124  * (typically in the individual .c files being debugged) to allow
 125  * selected debug messages to be generated where needed.
 126  */
 127
 128 #ifndef DBG_OUTPUT
 129 #define DBG_OUTPUT TIPC_NULL
 130 #endif
 131
 132 /*
 133  * TIPC can be configured to send debug messages to the specified print buffer
 134  * (typically DBG_OUTPUT) or to suppress them entirely.
 135  */
 136
 137 #ifdef CONFIG_TIPC_DEBUG
 138
 139 #define dbg(fmt, arg...)  \
 140         do { \
 141                 if (DBG_OUTPUT != TIPC_NULL) \
 142                         tipc_printf(DBG_OUTPUT, fmt, ## arg); \
 143         } while (0)
 144 #define msg_dbg(msg, txt) \
 145         do { \
 146                 if (DBG_OUTPUT != TIPC_NULL) \
 147                         tipc_msg_dbg(DBG_OUTPUT, msg, txt); \
 148         } while (0)
 149 #define dump(fmt, arg...) \
 150         do { \
 151                 if (DBG_OUTPUT != TIPC_NULL) \
 152                         tipc_dump_dbg(DBG_OUTPUT, fmt, ##arg); \
 153         } while (0)
 154
 155 void tipc_msg_dbg(struct print_buf *, struct tipc_msg *, const char *);
 156 void tipc_dump_dbg(struct print_buf *, const char *fmt, ...);
 157
 158 #else
 159
 160 #define dbg(fmt, arg...)        do {} while (0)
 161 #define msg_dbg(msg, txt)       do {} while (0)
 162 #define dump(fmt, arg...)       do {} while (0)
 163
 164 #define tipc_msg_dbg(...)       do {} while (0)
 165 #define tipc_dump_dbg(...)      do {} while (0)
 166
 167 #endif
 168
 169
 170 /*
 171  * TIPC-specific error codes
 172  */
 173
 174 #define ELINKCONG EAGAIN        /* link congestion <=> resource unavailable */
 175
 176 /*
 177  * Global configuration variables
 178  */
 179
 180 extern u32 tipc_own_addr;
 181 extern int tipc_max_zones;
 182 extern int tipc_max_clusters;
 183 extern int tipc_max_nodes;
 184 extern int tipc_max_slaves;
 185 extern int tipc_max_ports;
 186 extern int tipc_max_subscriptions;
 187 extern int tipc_max_publications;
 188 extern int tipc_net_id;
 189 extern int tipc_remote_management;
 190
 191 /*
 192  * Other global variables
 193  */
 194
 195 extern int tipc_mode;
 196 extern int tipc_random;
 197 extern const char tipc_alphabet[];
 198 extern atomic_t tipc_user_count;
 199
 200
 201 /*
 202  * Routines available to privileged subsystems
 203  */
 204
 205 extern int tipc_core_start_net(unsigned long);
 206 extern int  tipc_handler_start(void);
 207 extern void tipc_handler_stop(void);
 208 extern int  tipc_netlink_start(void);
 209 extern void tipc_netlink_stop(void);
 210 extern int  tipc_socket_init(void);
 211 extern void tipc_socket_stop(void);
 212
 213 static inline int delimit(int val, int min, int max)
 214 {
 215         if (val > max)
 216                 return max;
 217         if (val < min)
 218                 return min;
 219         return val;
 220 }
 221
 222
 223 /*
 224  * TIPC timer and signal code
 225  */
 226
 227 typedef void (*Handler) (unsigned long);
 228
 229 u32 tipc_k_signal(Handler routine, unsigned long argument);
 230
 231 /**
 232  * k_init_timer - initialize a timer
 233  * @timer: pointer to timer structure
 234  * @routine: pointer to routine to invoke when timer expires
 235  * @argument: value to pass to routine when timer expires
 236  *
 237  * Timer must be initialized before use (and terminated when no longer needed).
 238  */
 239
 240 static inline void k_init_timer(struct timer_list *timer, Handler routine,
 241                                 unsigned long argument)
 242 {
 243         dbg("initializing timer %p\n", timer);
 244         setup_timer(timer, routine, argument);
 245 }
 246
 247 /**
 248  * k_start_timer - start a timer
 249  * @timer: pointer to timer structure
 250  * @msec: time to delay (in ms)
 251  *
 252  * Schedules a previously initialized timer for later execution.
 253  * If timer is already running, the new timeout overrides the previous request.
 254  *
 255  * To ensure the timer doesn't expire before the specified delay elapses,
 256  * the amount of delay is rounded up when converting to the jiffies
 257  * then an additional jiffy is added to account for the fact that
 258  * the starting time may be in the middle of the current jiffy.
 259  */
 260
 261 static inline void k_start_timer(struct timer_list *timer, unsigned long msec)
 262 {
 263         dbg("starting timer %p for %u\n", timer, msec);
 264         mod_timer(timer, jiffies + msecs_to_jiffies(msec) + 1);
 265 }
 266
 267 /**
 268  * k_cancel_timer - cancel a timer
 269  * @timer: pointer to timer structure
 270  *
 271  * Cancels a previously initialized timer.
 272  * Can be called safely even if the timer is already inactive.
 273  *
 274  * WARNING: Must not be called when holding locks required by the timer's
 275  *          timeout routine, otherwise deadlock can occur on SMP systems!
 276  */
 277
 278 static inline void k_cancel_timer(struct timer_list *timer)
 279 {
 280         dbg("cancelling timer %p\n", timer);
 281         del_timer_sync(timer);
 282 }
 283
 284 /**
 285  * k_term_timer - terminate a timer
 286  * @timer: pointer to timer structure
 287  *
 288  * Prevents further use of a previously initialized timer.
 289  *
 290  * WARNING: Caller must ensure timer isn't currently running.
 291  *
 292  * (Do not "enhance" this routine to automatically cancel an active timer,
 293  * otherwise deadlock can arise when a timeout routine calls k_term_timer.)
 294  */
 295
 296 static inline void k_term_timer(struct timer_list *timer)
 297 {
 298         dbg("terminating timer %p\n", timer);
 299 }
 300
 301
 302 /*
 303  * TIPC message buffer code
 304  *
 305  * TIPC message buffer headroom reserves space for the worst-case
 306  * link-level device header (in case the message is sent off-node).
 307  *
 308  * Note: Headroom should be a multiple of 4 to ensure the TIPC header fields
 309  *       are word aligned for quicker access
 310  */
 311
 312 #define BUF_HEADROOM LL_MAX_HEADER
 313
 314 struct tipc_skb_cb {
 315         void *handle;
 316 };
 317
 318 #define TIPC_SKB_CB(__skb) ((struct tipc_skb_cb *)&((__skb)->cb[0]))
 319
 320
 321 static inline struct tipc_msg *buf_msg(struct sk_buff *skb)
 322 {
 323         return (struct tipc_msg *)skb->data;
 324 }
 325
 326 extern struct sk_buff *tipc_buf_acquire(u32 size);
 327
 328 /**
 329  * buf_discard - frees a TIPC message buffer
 330  * @skb: message buffer
 331  *
 332  * Frees a message buffer.  If passed NULL, just returns.
 333  */
 334
 335 static inline void buf_discard(struct sk_buff *skb)
 336 {
 337         kfree_skb(skb);
 338 }
 339
 340 /**
 341  * buf_linearize - convert a TIPC message buffer into a single contiguous piece
 342  * @skb: message buffer
 343  *
 344  * Returns 0 on success.
 345  */
 346
 347 static inline int buf_linearize(struct sk_buff *skb)
 348 {
 349         return skb_linearize(skb);
 350 }
 351
 352 #endif