aboutsummaryrefslogtreecommitdiff
path: root/net/tipc/core.h
blob: 4638947c2326e0ea534f490b02abc767270d2c1a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
/*
 * net/tipc/core.h: Include file for TIPC global declarations
 * 
 * Copyright (c) 2005-2006, Ericsson AB
 * Copyright (c) 2005-2006, Wind River Systems
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the names of the copyright holders nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _TIPC_CORE_H
#define _TIPC_CORE_H

#include <linux/tipc.h>
#include <linux/tipc_config.h>
#include <net/tipc/tipc_msg.h>
#include <net/tipc/tipc_port.h>
#include <net/tipc/tipc_bearer.h>
#include <net/tipc/tipc.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/mm.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <asm/uaccess.h>
#include <linux/interrupt.h>
#include <asm/atomic.h>
#include <asm/hardirq.h>
#include <linux/netdevice.h>
#include <linux/in.h>	
#include <linux/list.h>
#include <linux/vmalloc.h>

/*
 * TIPC debugging code
 */

#define assert(i)  BUG_ON(!(i))

struct tipc_msg;
extern struct print_buf *TIPC_NULL, *TIPC_CONS, *TIPC_LOG;
extern struct print_buf *TIPC_TEE(struct print_buf *, struct print_buf *);
void tipc_msg_print(struct print_buf*,struct tipc_msg *,const char*);
void tipc_printf(struct print_buf *, const char *fmt, ...);
void tipc_dump(struct print_buf*,const char *fmt, ...);

#ifdef CONFIG_TIPC_DEBUG

/*
 * TIPC debug support included:
 * - system messages are printed to TIPC_OUTPUT print buffer
 * - debug messages are printed to DBG_OUTPUT print buffer
 */

#define err(fmt, arg...)  tipc_printf(TIPC_OUTPUT, KERN_ERR "TIPC: " fmt, ## arg)
#define warn(fmt, arg...) tipc_printf(TIPC_OUTPUT, KERN_WARNING "TIPC: " fmt, ## arg)
#define info(fmt, arg...) tipc_printf(TIPC_OUTPUT, KERN_NOTICE "TIPC: " fmt, ## arg)

#define dbg(fmt, arg...)  do {if (DBG_OUTPUT != TIPC_NULL) tipc_printf(DBG_OUTPUT, fmt, ## arg);} while(0)
#define msg_dbg(msg, txt) do {if (DBG_OUTPUT != TIPC_NULL) tipc_msg_print(DBG_OUTPUT, msg, txt);} while(0)
#define dump(fmt, arg...) do {if (DBG_OUTPUT != TIPC_NULL) tipc_dump(DBG_OUTPUT, fmt, ##arg);} while(0)


/*	
 * By default, TIPC_OUTPUT is defined to be system console and TIPC log buffer,
 * while DBG_OUTPUT is the null print buffer.  These defaults can be changed
 * here, or on a per .c file basis, by redefining these symbols.  The following
 * print buffer options are available:
 *
 * TIPC_NULL		   : null buffer (i.e. print nowhere)
 * TIPC_CONS		   : system console
 * TIPC_LOG		   : TIPC log buffer
 * &buf			   : user-defined buffer (struct print_buf *)
 * TIPC_TEE(&buf_a,&buf_b) : list of buffers (eg. TIPC_TEE(TIPC_CONS,TIPC_LOG))
 */

#ifndef TIPC_OUTPUT
#define TIPC_OUTPUT TIPC_TEE(TIPC_CONS,TIPC_LOG)
#endif

#ifndef DBG_OUTPUT
#define DBG_OUTPUT TIPC_NULL
#endif

#else

/*
 * TIPC debug support not included:
 * - system messages are printed to system console
 * - debug messages are not printed
 */

#define err(fmt, arg...)  printk(KERN_ERR "TIPC: " fmt , ## arg)
#define info(fmt, arg...) printk(KERN_INFO "TIPC: " fmt , ## arg)
#define warn(fmt, arg...) printk(KERN_WARNING "TIPC: " fmt , ## arg)

#define dbg(fmt, arg...) do {} while (0)
#define msg_dbg(msg,txt) do {} while (0)
#define dump(fmt,arg...) do {} while (0)


/*	
 * TIPC_OUTPUT is defined to be the system console, while DBG_OUTPUT is
 * the null print buffer.  Thes ensures that any system or debug messages 
 * that are generated without using the above macros are handled correctly.
 */

#undef  TIPC_OUTPUT
#define TIPC_OUTPUT TIPC_CONS

#undef  DBG_OUTPUT
#define DBG_OUTPUT TIPC_NULL

#endif			  


/* 
 * TIPC-specific error codes
 */

#define ELINKCONG EAGAIN	/* link congestion <=> resource unavailable */

/*
 * Global configuration variables
 */

extern u32 tipc_own_addr;
extern int tipc_max_zones;
extern int tipc_max_clusters;
extern int tipc_max_nodes;
extern int tipc_max_slaves;
extern int tipc_max_ports;
extern int tipc_max_subscriptions;
extern int tipc_max_publications;
extern int tipc_net_id;
extern int tipc_remote_management;

/*
 * Other global variables
 */

extern int tipc_mode;
extern int tipc_random;
extern const char tipc_alphabet[];
extern atomic_t tipc_user_count;


/*
 * Routines available to privileged subsystems
 */

extern int  tipc_core_start(void);
extern void tipc_core_stop(void);
extern int  tipc_core_start_net(void);
extern void tipc_core_stop_net(void);

static inline int delimit(int val, int min, int max)
{
	if (val > max)
		return max;
	if (val < min)
		return min;
	return val;
}


/*
 * TIPC timer and signal code
 */

typedef void (*Handler) (unsigned long);

u32 tipc_k_signal(Handler routine, unsigned long argument);

/**
 * k_init_timer - initialize a timer
 * @timer: pointer to timer structure
 * @routine: pointer to routine to invoke when timer expires
 * @argument: value to pass to routine when timer expires
 * 
 * Timer must be initialized before use (and terminated when no longer needed).
 */

static inline void k_init_timer(struct timer_list *timer, Handler routine, 
				unsigned long argument)
{
	dbg("initializing timer %p\n", timer);
	init_timer(timer);
	timer->function = routine;
	timer->data = argument;
}

/**
 * k_start_timer - start a timer
 * @timer: pointer to timer structure
 * @msec: time to delay (in ms)
 * 
 * Schedules a previously initialized timer for later execution.
 * If timer is already running, the new timeout overrides the previous request.
 * 
 * To ensure the timer doesn't expire before the specified delay elapses,
 * the amount of delay is rounded up when converting to the jiffies
 * then an additional jiffy is added to account for the fact that 
 * the starting time may be in the middle of the current jiffy.
 */

static inline void k_start_timer(struct timer_list *timer, unsigned long msec)
{
	dbg("starting timer %p for %u\n", timer, msec);
	mod_timer(timer, jiffies + msecs_to_jiffies(msec) + 1);
}

/**
 * k_cancel_timer - cancel a timer
 * @timer: pointer to timer structure
 * 
 * Cancels a previously initialized timer.  
 * Can be called safely even if the timer is already inactive.
 * 
 * WARNING: Must not be called when holding locks required by the timer's
 *          timeout routine, otherwise deadlock can occur on SMP systems!
 */

static inline void k_cancel_timer(struct timer_list *timer)
{
	dbg("cancelling timer %p\n", timer);
	del_timer_sync(timer);
}

/**
 * k_term_timer - terminate a timer
 * @timer: pointer to timer structure
 * 
 * Prevents further use of a previously initialized timer.
 * 
 * WARNING: Caller must ensure timer isn't currently running.
 * 
 * (Do not "enhance" this routine to automatically cancel an active timer,
 * otherwise deadlock can arise when a timeout routine calls k_term_timer.)
 */

static inline void k_term_timer(struct timer_list *timer)
{
	dbg("terminating timer %p\n", timer);
}


/*
 * TIPC message buffer code
 *
 * TIPC message buffer headroom reserves space for a link-level header
 * (in case the message is sent off-node),
 * while ensuring TIPC header is word aligned for quicker access
 *
 * The largest header currently supported is 18 bytes, which is used when
 * the standard 14 byte Ethernet header has 4 added bytes for VLAN info
 */

#define BUF_HEADROOM 20u

struct tipc_skb_cb {
	void *handle;
};

#define TIPC_SKB_CB(__skb) ((struct tipc_skb_cb *)&((__skb)->cb[0]))


static inline struct tipc_msg *buf_msg(struct sk_buff *skb)
{
	return (struct tipc_msg *)skb->data;
}

/**
 * buf_acquire - creates a TIPC message buffer
 * @size: message size (including TIPC header)
 *
 * Returns a new buffer with data pointers set to the specified size.
 * 
 * NOTE: Headroom is reserved to allow prepending of a data link header.
 *       There may also be unrequested tailroom present at the buffer's end.
 */

static inline struct sk_buff *buf_acquire(u32 size)
{
	struct sk_buff *skb;
	unsigned int buf_size = (BUF_HEADROOM + size + 3) & ~3u;

	skb = alloc_skb(buf_size, GFP_ATOMIC);
	if (skb) {
		skb_reserve(skb, BUF_HEADROOM);
		skb_put(skb, size);
		skb->next = NULL;
	}
	return skb;
}

/**
 * buf_discard - frees a TIPC message buffer
 * @skb: message buffer
 *
 * Frees a message buffer.  If passed NULL, just returns.
 */

static inline void buf_discard(struct sk_buff *skb)
{
	if (likely(skb != NULL))
		kfree_skb(skb);
}

#endif