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