summaryrefslogtreecommitdiffstats
path: root/net/batman-adv/main.h
blob: 8a10619ae9162fcbd38b83ba7d2c41829e0b5531 (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
/* Copyright (C) 2007-2013 B.A.T.M.A.N. contributors:
 *
 * Marek Lindner, Simon Wunderlich
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA
 */

#ifndef _NET_BATMAN_ADV_MAIN_H_
#define _NET_BATMAN_ADV_MAIN_H_

#define BATADV_DRIVER_AUTHOR "Marek Lindner <lindner_marek@yahoo.de>, " \
			     "Simon Wunderlich <siwu@hrz.tu-chemnitz.de>"
#define BATADV_DRIVER_DESC   "B.A.T.M.A.N. advanced"
#define BATADV_DRIVER_DEVICE "batman-adv"

#ifndef BATADV_SOURCE_VERSION
#define BATADV_SOURCE_VERSION "2013.1.0"
#endif

/* B.A.T.M.A.N. parameters */

#define BATADV_TQ_MAX_VALUE 255
#define BATADV_JITTER 20

/* Time To Live of broadcast messages */
#define BATADV_TTL 50

/* purge originators after time in seconds if no valid packet comes in
 * -> TODO: check influence on BATADV_TQ_LOCAL_WINDOW_SIZE
 */
#define BATADV_PURGE_TIMEOUT 200000 /* 200 seconds */
#define BATADV_TT_LOCAL_TIMEOUT 600000 /* in milliseconds */
#define BATADV_TT_CLIENT_ROAM_TIMEOUT 600000 /* in milliseconds */
#define BATADV_TT_CLIENT_TEMP_TIMEOUT 600000 /* in milliseconds */
#define BATADV_TT_WORK_PERIOD 5000 /* 5 seconds */
#define BATADV_ORIG_WORK_PERIOD 1000 /* 1 second */
#define BATADV_DAT_ENTRY_TIMEOUT (5*60000) /* 5 mins in milliseconds */
/* sliding packet range of received originator messages in sequence numbers
 * (should be a multiple of our word size)
 */
#define BATADV_TQ_LOCAL_WINDOW_SIZE 64
/* milliseconds we have to keep pending tt_req */
#define BATADV_TT_REQUEST_TIMEOUT 3000

#define BATADV_TQ_GLOBAL_WINDOW_SIZE 5
#define BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM 1
#define BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM 1
#define BATADV_TQ_TOTAL_BIDRECT_LIMIT 1

/* number of OGMs sent with the last tt diff */
#define BATADV_TT_OGM_APPEND_MAX 3

/* Time in which a client can roam at most ROAMING_MAX_COUNT times in
 * milliseconds
 */
#define BATADV_ROAMING_MAX_TIME 20000
#define BATADV_ROAMING_MAX_COUNT 5

#define BATADV_NO_FLAGS 0

#define BATADV_NULL_IFINDEX 0 /* dummy ifindex used to avoid iface checks */

#define BATADV_NUM_WORDS BITS_TO_LONGS(BATADV_TQ_LOCAL_WINDOW_SIZE)

#define BATADV_LOG_BUF_LEN 8192	  /* has to be a power of 2 */

/* msecs after which an ARP_REQUEST is sent in broadcast as fallback */
#define ARP_REQ_DELAY 250
/* numbers of originator to contact for any PUT/GET DHT operation */
#define BATADV_DAT_CANDIDATES_NUM 3

#define BATADV_VIS_INTERVAL 5000	/* 5 seconds */

/* how much worse secondary interfaces may be to be considered as bonding
 * candidates
 */
#define BATADV_BONDING_TQ_THRESHOLD	50

/* should not be bigger than 512 bytes or change the size of
 * forw_packet->direct_link_flags
 */
#define BATADV_MAX_AGGREGATION_BYTES 512
#define BATADV_MAX_AGGREGATION_MS 100

#define BATADV_BLA_PERIOD_LENGTH	10000	/* 10 seconds */
#define BATADV_BLA_BACKBONE_TIMEOUT	(BATADV_BLA_PERIOD_LENGTH * 3)
#define BATADV_BLA_CLAIM_TIMEOUT	(BATADV_BLA_PERIOD_LENGTH * 10)
#define BATADV_BLA_WAIT_PERIODS		3

#define BATADV_DUPLIST_SIZE		16
#define BATADV_DUPLIST_TIMEOUT		500	/* 500 ms */
/* don't reset again within 30 seconds */
#define BATADV_RESET_PROTECTION_MS 30000
#define BATADV_EXPECTED_SEQNO_RANGE	65536

#define BATADV_NC_NODE_TIMEOUT 10000 /* Milliseconds */

enum batadv_mesh_state {
	BATADV_MESH_INACTIVE,
	BATADV_MESH_ACTIVE,
	BATADV_MESH_DEACTIVATING,
};

#define BATADV_BCAST_QUEUE_LEN		256
#define BATADV_BATMAN_QUEUE_LEN	256

enum batadv_uev_action {
	BATADV_UEV_ADD = 0,
	BATADV_UEV_DEL,
	BATADV_UEV_CHANGE,
};

enum batadv_uev_type {
	BATADV_UEV_GW = 0,
};

#define BATADV_GW_THRESHOLD	50

#define BATADV_DAT_CANDIDATE_NOT_FOUND	0
#define BATADV_DAT_CANDIDATE_ORIG	1

/* Debug Messages */
#ifdef pr_fmt
#undef pr_fmt
#endif
/* Append 'batman-adv: ' before kernel messages */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

/* Kernel headers */

#include <linux/mutex.h>	/* mutex */
#include <linux/module.h>	/* needed by all modules */
#include <linux/netdevice.h>	/* netdevice */
#include <linux/etherdevice.h>  /* ethernet address classification */
#include <linux/if_ether.h>	/* ethernet header */
#include <linux/poll.h>		/* poll_table */
#include <linux/kthread.h>	/* kernel threads */
#include <linux/pkt_sched.h>	/* schedule types */
#include <linux/workqueue.h>	/* workqueue */
#include <linux/percpu.h>
#include <linux/slab.h>
#include <net/sock.h>		/* struct sock */
#include <linux/jiffies.h>
#include <linux/seq_file.h>
#include "types.h"

extern char batadv_routing_algo[];
extern struct list_head batadv_hardif_list;

extern unsigned char batadv_broadcast_addr[];
extern struct workqueue_struct *batadv_event_workqueue;

int batadv_mesh_init(struct net_device *soft_iface);
void batadv_mesh_free(struct net_device *soft_iface);
int batadv_is_my_mac(const uint8_t *addr);
struct batadv_hard_iface *
batadv_seq_print_text_primary_if_get(struct seq_file *seq);
int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
			   struct packet_type *ptype,
			   struct net_device *orig_dev);
int
batadv_recv_handler_register(uint8_t packet_type,
			     int (*recv_handler)(struct sk_buff *,
						 struct batadv_hard_iface *));
void batadv_recv_handler_unregister(uint8_t packet_type);
int batadv_algo_register(struct batadv_algo_ops *bat_algo_ops);
int batadv_algo_select(struct batadv_priv *bat_priv, char *name);
int batadv_algo_seq_print_text(struct seq_file *seq, void *offset);
__be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr);

/**
 * enum batadv_dbg_level - available log levels
 * @BATADV_DBG_BATMAN: OGM and TQ computations related messages
 * @BATADV_DBG_ROUTES: route added / changed / deleted
 * @BATADV_DBG_TT: translation table messages
 * @BATADV_DBG_BLA: bridge loop avoidance messages
 * @BATADV_DBG_DAT: ARP snooping and DAT related messages
 * @BATADV_DBG_NC: network coding related messages
 * @BATADV_DBG_ALL: the union of all the above log levels
 */
enum batadv_dbg_level {
	BATADV_DBG_BATMAN = BIT(0),
	BATADV_DBG_ROUTES = BIT(1),
	BATADV_DBG_TT	  = BIT(2),
	BATADV_DBG_BLA    = BIT(3),
	BATADV_DBG_DAT    = BIT(4),
	BATADV_DBG_NC	  = BIT(5),
	BATADV_DBG_ALL    = 63,
};

#ifdef CONFIG_BATMAN_ADV_DEBUG
int batadv_debug_log(struct batadv_priv *bat_priv, const char *fmt, ...)
__printf(2, 3);

#define batadv_dbg(type, bat_priv, fmt, arg...)			\
	do {							\
		if (atomic_read(&bat_priv->log_level) & type)	\
			batadv_debug_log(bat_priv, fmt, ## arg);\
	}							\
	while (0)
#else /* !CONFIG_BATMAN_ADV_DEBUG */
__printf(3, 4)
static inline void batadv_dbg(int type __always_unused,
			      struct batadv_priv *bat_priv __always_unused,
			      const char *fmt __always_unused, ...)
{
}
#endif

#define batadv_info(net_dev, fmt, arg...)				\
	do {								\
		struct net_device *_netdev = (net_dev);                 \
		struct batadv_priv *_batpriv = netdev_priv(_netdev);    \
		batadv_dbg(BATADV_DBG_ALL, _batpriv, fmt, ## arg);	\
		pr_info("%s: " fmt, _netdev->name, ## arg);		\
	} while (0)
#define batadv_err(net_dev, fmt, arg...)				\
	do {								\
		struct net_device *_netdev = (net_dev);                 \
		struct batadv_priv *_batpriv = netdev_priv(_netdev);    \
		batadv_dbg(BATADV_DBG_ALL, _batpriv, fmt, ## arg);	\
		pr_err("%s: " fmt, _netdev->name, ## arg);		\
	} while (0)

/* returns 1 if they are the same ethernet addr
 *
 * note: can't use compare_ether_addr() as it requires aligned memory
 */
static inline int batadv_compare_eth(const void *data1, const void *data2)
{
	return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
}

/**
 * has_timed_out - compares current time (jiffies) and timestamp + timeout
 * @timestamp:		base value to compare with (in jiffies)
 * @timeout:		added to base value before comparing (in milliseconds)
 *
 * Returns true if current time is after timestamp + timeout
 */
static inline bool batadv_has_timed_out(unsigned long timestamp,
					unsigned int timeout)
{
	return time_is_before_jiffies(timestamp + msecs_to_jiffies(timeout));
}

#define batadv_atomic_dec_not_zero(v)	atomic_add_unless((v), -1, 0)

/* Returns the smallest signed integer in two's complement with the sizeof x */
#define batadv_smallest_signed_int(x) (1u << (7u + 8u * (sizeof(x) - 1u)))

/* Checks if a sequence number x is a predecessor/successor of y.
 * they handle overflows/underflows and can correctly check for a
 * predecessor/successor unless the variable sequence number has grown by
 * more then 2**(bitwidth(x)-1)-1.
 * This means that for a uint8_t with the maximum value 255, it would think:
 *  - when adding nothing - it is neither a predecessor nor a successor
 *  - before adding more than 127 to the starting value - it is a predecessor,
 *  - when adding 128 - it is neither a predecessor nor a successor,
 *  - after adding more than 127 to the starting value - it is a successor
 */
#define batadv_seq_before(x, y) ({typeof(x) _d1 = (x); \
				 typeof(y) _d2 = (y); \
				 typeof(x) _dummy = (_d1 - _d2); \
				 (void) (&_d1 == &_d2); \
				 _dummy > batadv_smallest_signed_int(_dummy); })
#define batadv_seq_after(x, y) batadv_seq_before(y, x)

/* Stop preemption on local cpu while incrementing the counter */
static inline void batadv_add_counter(struct batadv_priv *bat_priv, size_t idx,
				      size_t count)
{
	this_cpu_add(bat_priv->bat_counters[idx], count);
}

#define batadv_inc_counter(b, i) batadv_add_counter(b, i, 1)

/* Sum and return the cpu-local counters for index 'idx' */
static inline uint64_t batadv_sum_counter(struct batadv_priv *bat_priv,
					  size_t idx)
{
	uint64_t *counters, sum = 0;
	int cpu;

	for_each_possible_cpu(cpu) {
		counters = per_cpu_ptr(bat_priv->bat_counters, cpu);
		sum += counters[idx];
	}

	return sum;
}

#endif /* _NET_BATMAN_ADV_MAIN_H_ */
OpenPOWER on IntegriCloud