1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* Copyright (C) B.A.T.M.A.N. contributors:
3 *
4 * Marek Lindner, Simon Wunderlich
5 */
6
7 #ifndef _NET_BATMAN_ADV_MAIN_H_
8 #define _NET_BATMAN_ADV_MAIN_H_
9
10 #define BATADV_DRIVER_AUTHOR "Marek Lindner <mareklindner@neomailbox.ch>, " \
11 "Simon Wunderlich <sw@simonwunderlich.de>"
12 #define BATADV_DRIVER_DESC "B.A.T.M.A.N. advanced"
13 #define BATADV_DRIVER_DEVICE "batman-adv"
14
15 #ifndef BATADV_SOURCE_VERSION
16 #define BATADV_SOURCE_VERSION "2021.3"
17 #endif
18
19 /* B.A.T.M.A.N. parameters */
20
21 #define BATADV_TQ_MAX_VALUE 255
22 #define BATADV_THROUGHPUT_MAX_VALUE 0xFFFFFFFF
23 #define BATADV_JITTER 20
24
25 /* Time To Live of broadcast messages */
26 #define BATADV_TTL 50
27
28 /* maximum sequence number age of broadcast messages */
29 #define BATADV_BCAST_MAX_AGE 64
30
31 /* purge originators after time in seconds if no valid packet comes in
32 * -> TODO: check influence on BATADV_TQ_LOCAL_WINDOW_SIZE
33 */
34 #define BATADV_PURGE_TIMEOUT 200000 /* 200 seconds */
35 #define BATADV_TT_LOCAL_TIMEOUT 600000 /* in milliseconds */
36 #define BATADV_TT_CLIENT_ROAM_TIMEOUT 600000 /* in milliseconds */
37 #define BATADV_TT_CLIENT_TEMP_TIMEOUT 600000 /* in milliseconds */
38 #define BATADV_TT_WORK_PERIOD 5000 /* 5 seconds */
39 #define BATADV_ORIG_WORK_PERIOD 1000 /* 1 second */
40 #define BATADV_MCAST_WORK_PERIOD 500 /* 0.5 seconds */
41 #define BATADV_DAT_ENTRY_TIMEOUT (5 * 60000) /* 5 mins in milliseconds */
42 /* sliding packet range of received originator messages in sequence numbers
43 * (should be a multiple of our word size)
44 */
45 #define BATADV_TQ_LOCAL_WINDOW_SIZE 64
46 /* milliseconds we have to keep pending tt_req */
47 #define BATADV_TT_REQUEST_TIMEOUT 3000
48
49 #define BATADV_TQ_GLOBAL_WINDOW_SIZE 5
50 #define BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM 1
51 #define BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM 1
52 #define BATADV_TQ_TOTAL_BIDRECT_LIMIT 1
53
54 /* B.A.T.M.A.N. V */
55 #define BATADV_THROUGHPUT_DEFAULT_VALUE 10 /* 1 Mbps */
56 #define BATADV_ELP_PROBES_PER_NODE 2
57 #define BATADV_ELP_MIN_PROBE_SIZE 200 /* bytes */
58 #define BATADV_ELP_PROBE_MAX_TX_DIFF 100 /* milliseconds */
59 #define BATADV_ELP_MAX_AGE 64
60 #define BATADV_OGM_MAX_ORIGDIFF 5
61 #define BATADV_OGM_MAX_AGE 64
62
63 /* number of OGMs sent with the last tt diff */
64 #define BATADV_TT_OGM_APPEND_MAX 3
65
66 /* Time in which a client can roam at most ROAMING_MAX_COUNT times in
67 * milliseconds
68 */
69 #define BATADV_ROAMING_MAX_TIME 20000
70 #define BATADV_ROAMING_MAX_COUNT 5
71
72 #define BATADV_NO_FLAGS 0
73
74 #define BATADV_NULL_IFINDEX 0 /* dummy ifindex used to avoid iface checks */
75
76 #define BATADV_NO_MARK 0
77
78 /* default interface for multi interface operation. The default interface is
79 * used for communication which originated locally (i.e. is not forwarded)
80 * or where special forwarding is not desired/necessary.
81 */
82 #define BATADV_IF_DEFAULT ((struct batadv_hard_iface *)NULL)
83
84 #define BATADV_NUM_WORDS BITS_TO_LONGS(BATADV_TQ_LOCAL_WINDOW_SIZE)
85
86 #define BATADV_LOG_BUF_LEN 8192 /* has to be a power of 2 */
87
88 /* number of packets to send for broadcasts on different interface types */
89 #define BATADV_NUM_BCASTS_DEFAULT 1
90 #define BATADV_NUM_BCASTS_WIRELESS 3
91
92 /* length of the single packet used by the TP meter */
93 #define BATADV_TP_PACKET_LEN ETH_DATA_LEN
94
95 /* msecs after which an ARP_REQUEST is sent in broadcast as fallback */
96 #define ARP_REQ_DELAY 250
97 /* numbers of originator to contact for any PUT/GET DHT operation */
98 #define BATADV_DAT_CANDIDATES_NUM 3
99
100 /* BATADV_TQ_SIMILARITY_THRESHOLD - TQ points that a secondary metric can differ
101 * at most from the primary one in order to be still considered acceptable
102 */
103 #define BATADV_TQ_SIMILARITY_THRESHOLD 50
104
105 /* should not be bigger than 512 bytes or change the size of
106 * forw_packet->direct_link_flags
107 */
108 #define BATADV_MAX_AGGREGATION_BYTES 512
109 #define BATADV_MAX_AGGREGATION_MS 100
110
111 #define BATADV_BLA_PERIOD_LENGTH 10000 /* 10 seconds */
112 #define BATADV_BLA_BACKBONE_TIMEOUT (BATADV_BLA_PERIOD_LENGTH * 6)
113 #define BATADV_BLA_CLAIM_TIMEOUT (BATADV_BLA_PERIOD_LENGTH * 10)
114 #define BATADV_BLA_WAIT_PERIODS 3
115 #define BATADV_BLA_LOOPDETECT_PERIODS 6
116 #define BATADV_BLA_LOOPDETECT_TIMEOUT 3000 /* 3 seconds */
117
118 #define BATADV_DUPLIST_SIZE 16
119 #define BATADV_DUPLIST_TIMEOUT 500 /* 500 ms */
120 /* don't reset again within 30 seconds */
121 #define BATADV_RESET_PROTECTION_MS 30000
122 #define BATADV_EXPECTED_SEQNO_RANGE 65536
123
124 #define BATADV_NC_NODE_TIMEOUT 10000 /* Milliseconds */
125
126 /**
127 * BATADV_TP_MAX_NUM - maximum number of simultaneously active tp sessions
128 */
129 #define BATADV_TP_MAX_NUM 5
130
131 /**
132 * enum batadv_mesh_state - State of a soft interface
133 */
134 enum batadv_mesh_state {
135 /** @BATADV_MESH_INACTIVE: soft interface is not yet running */
136 BATADV_MESH_INACTIVE,
137
138 /** @BATADV_MESH_ACTIVE: interface is up and running */
139 BATADV_MESH_ACTIVE,
140
141 /** @BATADV_MESH_DEACTIVATING: interface is getting shut down */
142 BATADV_MESH_DEACTIVATING,
143 };
144
145 #define BATADV_BCAST_QUEUE_LEN 256
146 #define BATADV_BATMAN_QUEUE_LEN 256
147
148 /**
149 * enum batadv_uev_action - action type of uevent
150 */
151 enum batadv_uev_action {
152 /** @BATADV_UEV_ADD: gateway was selected (after none was selected) */
153 BATADV_UEV_ADD = 0,
154
155 /**
156 * @BATADV_UEV_DEL: selected gateway was removed and none is selected
157 * anymore
158 */
159 BATADV_UEV_DEL,
160
161 /**
162 * @BATADV_UEV_CHANGE: a different gateway was selected as based gateway
163 */
164 BATADV_UEV_CHANGE,
165
166 /**
167 * @BATADV_UEV_LOOPDETECT: loop was detected which cannot be handled by
168 * bridge loop avoidance
169 */
170 BATADV_UEV_LOOPDETECT,
171 };
172
173 /**
174 * enum batadv_uev_type - Type of uevent
175 */
176 enum batadv_uev_type {
177 /** @BATADV_UEV_GW: selected gateway was modified */
178 BATADV_UEV_GW = 0,
179
180 /** @BATADV_UEV_BLA: bridge loop avoidance event */
181 BATADV_UEV_BLA,
182 };
183
184 #define BATADV_GW_THRESHOLD 50
185
186 /* Number of fragment chains for each orig_node */
187 #define BATADV_FRAG_BUFFER_COUNT 8
188 /* Maximum number of fragments for one packet */
189 #define BATADV_FRAG_MAX_FRAGMENTS 16
190 /* Maxumim size of each fragment */
191 #define BATADV_FRAG_MAX_FRAG_SIZE 1280
192 /* Time to keep fragments while waiting for rest of the fragments */
193 #define BATADV_FRAG_TIMEOUT 10000
194
195 #define BATADV_DAT_CANDIDATE_NOT_FOUND 0
196 #define BATADV_DAT_CANDIDATE_ORIG 1
197
198 /* Debug Messages */
199 #ifdef pr_fmt
200 #undef pr_fmt
201 #endif
202 /* Append 'batman-adv: ' before kernel messages */
203 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
204
205 /* Kernel headers */
206
207 #include <linux/atomic.h>
208 #include <linux/compiler.h>
209 #include <linux/etherdevice.h>
210 #include <linux/if_vlan.h>
211 #include <linux/jiffies.h>
212 #include <linux/netdevice.h>
213 #include <linux/percpu.h>
214 #include <linux/skbuff.h>
215 #include <linux/types.h>
216 #include <uapi/linux/batadv_packet.h>
217
218 #include "types.h"
219 #include "main.h"
220
221 /**
222 * batadv_print_vid() - return printable version of vid information
223 * @vid: the VLAN identifier
224 *
225 * Return: -1 when no VLAN is used, VLAN id otherwise
226 */
batadv_print_vid(unsigned short vid)227 static inline int batadv_print_vid(unsigned short vid)
228 {
229 if (vid & BATADV_VLAN_HAS_TAG)
230 return (int)(vid & VLAN_VID_MASK);
231 else
232 return -1;
233 }
234
235 extern struct list_head batadv_hardif_list;
236 extern unsigned int batadv_hardif_generation;
237
238 extern unsigned char batadv_broadcast_addr[];
239 extern struct workqueue_struct *batadv_event_workqueue;
240
241 int batadv_mesh_init(struct net_device *soft_iface);
242 void batadv_mesh_free(struct net_device *soft_iface);
243 bool batadv_is_my_mac(struct batadv_priv *bat_priv, const u8 *addr);
244 int batadv_max_header_len(void);
245 void batadv_skb_set_priority(struct sk_buff *skb, int offset);
246 int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
247 struct packet_type *ptype,
248 struct net_device *orig_dev);
249 int
250 batadv_recv_handler_register(u8 packet_type,
251 int (*recv_handler)(struct sk_buff *,
252 struct batadv_hard_iface *));
253 void batadv_recv_handler_unregister(u8 packet_type);
254 __be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr);
255
256 /**
257 * batadv_compare_eth() - Compare two not u16 aligned Ethernet addresses
258 * @data1: Pointer to a six-byte array containing the Ethernet address
259 * @data2: Pointer other six-byte array containing the Ethernet address
260 *
261 * note: can't use ether_addr_equal() as it requires aligned memory
262 *
263 * Return: true if they are the same ethernet addr
264 */
batadv_compare_eth(const void * data1,const void * data2)265 static inline bool batadv_compare_eth(const void *data1, const void *data2)
266 {
267 return ether_addr_equal_unaligned(data1, data2);
268 }
269
270 /**
271 * batadv_has_timed_out() - compares current time (jiffies) and timestamp +
272 * timeout
273 * @timestamp: base value to compare with (in jiffies)
274 * @timeout: added to base value before comparing (in milliseconds)
275 *
276 * Return: true if current time is after timestamp + timeout
277 */
batadv_has_timed_out(unsigned long timestamp,unsigned int timeout)278 static inline bool batadv_has_timed_out(unsigned long timestamp,
279 unsigned int timeout)
280 {
281 return time_is_before_jiffies(timestamp + msecs_to_jiffies(timeout));
282 }
283
284 /**
285 * batadv_atomic_dec_not_zero() - Decrease unless the number is 0
286 * @v: pointer of type atomic_t
287 *
288 * Return: non-zero if v was not 0, and zero otherwise.
289 */
290 #define batadv_atomic_dec_not_zero(v) atomic_add_unless((v), -1, 0)
291
292 /**
293 * batadv_smallest_signed_int() - Returns the smallest signed integer in two's
294 * complement with the sizeof x
295 * @x: type of integer
296 *
297 * Return: smallest signed integer of type
298 */
299 #define batadv_smallest_signed_int(x) (1u << (7u + 8u * (sizeof(x) - 1u)))
300
301 /**
302 * batadv_seq_before() - Checks if a sequence number x is a predecessor of y
303 * @x: potential predecessor of @y
304 * @y: value to compare @x against
305 *
306 * It handles overflows/underflows and can correctly check for a predecessor
307 * unless the variable sequence number has grown by more than
308 * 2**(bitwidth(x)-1)-1.
309 *
310 * This means that for a u8 with the maximum value 255, it would think:
311 *
312 * * when adding nothing - it is neither a predecessor nor a successor
313 * * before adding more than 127 to the starting value - it is a predecessor,
314 * * when adding 128 - it is neither a predecessor nor a successor,
315 * * after adding more than 127 to the starting value - it is a successor
316 *
317 * Return: true when x is a predecessor of y, false otherwise
318 */
319 #define batadv_seq_before(x, y) ({ \
320 typeof(x)_d1 = (x); \
321 typeof(y)_d2 = (y); \
322 typeof(x)_dummy = (_d1 - _d2); \
323 (void)(&_d1 == &_d2); \
324 _dummy > batadv_smallest_signed_int(_dummy); \
325 })
326
327 /**
328 * batadv_seq_after() - Checks if a sequence number x is a successor of y
329 * @x: potential successor of @y
330 * @y: value to compare @x against
331 *
332 * It handles overflows/underflows and can correctly check for a successor
333 * unless the variable sequence number has grown by more than
334 * 2**(bitwidth(x)-1)-1.
335 *
336 * This means that for a u8 with the maximum value 255, it would think:
337 *
338 * * when adding nothing - it is neither a predecessor nor a successor
339 * * before adding more than 127 to the starting value - it is a predecessor,
340 * * when adding 128 - it is neither a predecessor nor a successor,
341 * * after adding more than 127 to the starting value - it is a successor
342 *
343 * Return: true when x is a successor of y, false otherwise
344 */
345 #define batadv_seq_after(x, y) batadv_seq_before(y, x)
346
347 /**
348 * batadv_add_counter() - Add to per cpu statistics counter of soft interface
349 * @bat_priv: the bat priv with all the soft interface information
350 * @idx: counter index which should be modified
351 * @count: value to increase counter by
352 *
353 * Stop preemption on local cpu while incrementing the counter
354 */
batadv_add_counter(struct batadv_priv * bat_priv,size_t idx,size_t count)355 static inline void batadv_add_counter(struct batadv_priv *bat_priv, size_t idx,
356 size_t count)
357 {
358 this_cpu_add(bat_priv->bat_counters[idx], count);
359 }
360
361 /**
362 * batadv_inc_counter() - Increase per cpu statistics counter of soft interface
363 * @b: the bat priv with all the soft interface information
364 * @i: counter index which should be modified
365 */
366 #define batadv_inc_counter(b, i) batadv_add_counter(b, i, 1)
367
368 /**
369 * BATADV_SKB_CB() - Get batadv_skb_cb from skb control buffer
370 * @__skb: skb holding the control buffer
371 *
372 * The members of the control buffer are defined in struct batadv_skb_cb in
373 * types.h. The macro is inspired by the similar macro TCP_SKB_CB() in tcp.h.
374 *
375 * Return: pointer to the batadv_skb_cb of the skb
376 */
377 #define BATADV_SKB_CB(__skb) ((struct batadv_skb_cb *)&((__skb)->cb[0]))
378
379 unsigned short batadv_get_vid(struct sk_buff *skb, size_t header_len);
380 bool batadv_vlan_ap_isola_get(struct batadv_priv *bat_priv, unsigned short vid);
381 int batadv_throw_uevent(struct batadv_priv *bat_priv, enum batadv_uev_type type,
382 enum batadv_uev_action action, const char *data);
383
384 #endif /* _NET_BATMAN_ADV_MAIN_H_ */
385