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1 | /* Copyright (C) 2007-2013 B.A.T.M.A.N. contributors: |
2 | * |
3 | * Marek Lindner, Simon Wunderlich |
4 | * |
5 | * This program is free software; you can redistribute it and/or |
6 | * modify it under the terms of version 2 of the GNU General Public |
7 | * License as published by the Free Software Foundation. |
8 | * |
9 | * This program is distributed in the hope that it will be useful, but |
10 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
12 | * General Public License for more details. |
13 | * |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, write to the Free Software |
16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
17 | * 02110-1301, USA |
18 | */ |
19 | |
20 | #ifndef _NET_BATMAN_ADV_MAIN_H_ |
21 | #define _NET_BATMAN_ADV_MAIN_H_ |
22 | |
23 | #define BATADV_DRIVER_AUTHOR "Marek Lindner <mareklindner@neomailbox.ch>, " \ |
24 | "Simon Wunderlich <sw@simonwunderlich.de>" |
25 | #define BATADV_DRIVER_DESC "B.A.T.M.A.N. advanced" |
26 | #define BATADV_DRIVER_DEVICE "batman-adv" |
27 | |
28 | #ifndef BATADV_SOURCE_VERSION |
29 | #define BATADV_SOURCE_VERSION "2013.5.0" |
30 | #endif |
31 | |
32 | /* B.A.T.M.A.N. parameters */ |
33 | |
34 | #define BATADV_TQ_MAX_VALUE 255 |
35 | #define BATADV_JITTER 20 |
36 | |
37 | /* Time To Live of broadcast messages */ |
38 | #define BATADV_TTL 50 |
39 | |
40 | /* purge originators after time in seconds if no valid packet comes in |
41 | * -> TODO: check influence on BATADV_TQ_LOCAL_WINDOW_SIZE |
42 | */ |
43 | #define BATADV_PURGE_TIMEOUT 200000 /* 200 seconds */ |
44 | #define BATADV_TT_LOCAL_TIMEOUT 600000 /* in milliseconds */ |
45 | #define BATADV_TT_CLIENT_ROAM_TIMEOUT 600000 /* in milliseconds */ |
46 | #define BATADV_TT_CLIENT_TEMP_TIMEOUT 600000 /* in milliseconds */ |
47 | #define BATADV_TT_WORK_PERIOD 5000 /* 5 seconds */ |
48 | #define BATADV_ORIG_WORK_PERIOD 1000 /* 1 second */ |
49 | #define BATADV_DAT_ENTRY_TIMEOUT (5*60000) /* 5 mins in milliseconds */ |
50 | /* sliding packet range of received originator messages in sequence numbers |
51 | * (should be a multiple of our word size) |
52 | */ |
53 | #define BATADV_TQ_LOCAL_WINDOW_SIZE 64 |
54 | /* milliseconds we have to keep pending tt_req */ |
55 | #define BATADV_TT_REQUEST_TIMEOUT 3000 |
56 | |
57 | #define BATADV_TQ_GLOBAL_WINDOW_SIZE 5 |
58 | #define BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM 1 |
59 | #define BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM 1 |
60 | #define BATADV_TQ_TOTAL_BIDRECT_LIMIT 1 |
61 | |
62 | /* number of OGMs sent with the last tt diff */ |
63 | #define BATADV_TT_OGM_APPEND_MAX 3 |
64 | |
65 | /* Time in which a client can roam at most ROAMING_MAX_COUNT times in |
66 | * milliseconds |
67 | */ |
68 | #define BATADV_ROAMING_MAX_TIME 20000 |
69 | #define BATADV_ROAMING_MAX_COUNT 5 |
70 | |
71 | #define BATADV_NO_FLAGS 0 |
72 | |
73 | #define BATADV_NULL_IFINDEX 0 /* dummy ifindex used to avoid iface checks */ |
74 | |
75 | #define BATADV_NUM_WORDS BITS_TO_LONGS(BATADV_TQ_LOCAL_WINDOW_SIZE) |
76 | |
77 | #define BATADV_LOG_BUF_LEN 8192 /* has to be a power of 2 */ |
78 | |
79 | /* number of packets to send for broadcasts on different interface types */ |
80 | #define BATADV_NUM_BCASTS_DEFAULT 1 |
81 | #define BATADV_NUM_BCASTS_WIRELESS 3 |
82 | #define BATADV_NUM_BCASTS_MAX 3 |
83 | |
84 | /* msecs after which an ARP_REQUEST is sent in broadcast as fallback */ |
85 | #define ARP_REQ_DELAY 250 |
86 | /* numbers of originator to contact for any PUT/GET DHT operation */ |
87 | #define BATADV_DAT_CANDIDATES_NUM 3 |
88 | |
89 | /** |
90 | * BATADV_TQ_SIMILARITY_THRESHOLD - TQ points that a secondary metric can differ |
91 | * at most from the primary one in order to be still considered acceptable |
92 | */ |
93 | #define BATADV_TQ_SIMILARITY_THRESHOLD 50 |
94 | |
95 | /* how much worse secondary interfaces may be to be considered as bonding |
96 | * candidates |
97 | */ |
98 | #define BATADV_BONDING_TQ_THRESHOLD 50 |
99 | |
100 | /* should not be bigger than 512 bytes or change the size of |
101 | * forw_packet->direct_link_flags |
102 | */ |
103 | #define BATADV_MAX_AGGREGATION_BYTES 512 |
104 | #define BATADV_MAX_AGGREGATION_MS 100 |
105 | |
106 | #define BATADV_BLA_PERIOD_LENGTH 10000 /* 10 seconds */ |
107 | #define BATADV_BLA_BACKBONE_TIMEOUT (BATADV_BLA_PERIOD_LENGTH * 3) |
108 | #define BATADV_BLA_CLAIM_TIMEOUT (BATADV_BLA_PERIOD_LENGTH * 10) |
109 | #define BATADV_BLA_WAIT_PERIODS 3 |
110 | |
111 | #define BATADV_DUPLIST_SIZE 16 |
112 | #define BATADV_DUPLIST_TIMEOUT 500 /* 500 ms */ |
113 | /* don't reset again within 30 seconds */ |
114 | #define BATADV_RESET_PROTECTION_MS 30000 |
115 | #define BATADV_EXPECTED_SEQNO_RANGE 65536 |
116 | |
117 | #define BATADV_NC_NODE_TIMEOUT 10000 /* Milliseconds */ |
118 | |
119 | enum batadv_mesh_state { |
120 | BATADV_MESH_INACTIVE, |
121 | BATADV_MESH_ACTIVE, |
122 | BATADV_MESH_DEACTIVATING, |
123 | }; |
124 | |
125 | #define BATADV_BCAST_QUEUE_LEN 256 |
126 | #define BATADV_BATMAN_QUEUE_LEN 256 |
127 | |
128 | enum batadv_uev_action { |
129 | BATADV_UEV_ADD = 0, |
130 | BATADV_UEV_DEL, |
131 | BATADV_UEV_CHANGE, |
132 | }; |
133 | |
134 | enum batadv_uev_type { |
135 | BATADV_UEV_GW = 0, |
136 | }; |
137 | |
138 | #define BATADV_GW_THRESHOLD 50 |
139 | |
140 | /* Number of fragment chains for each orig_node */ |
141 | #define BATADV_FRAG_BUFFER_COUNT 8 |
142 | /* Maximum number of fragments for one packet */ |
143 | #define BATADV_FRAG_MAX_FRAGMENTS 16 |
144 | /* Maxumim size of each fragment */ |
145 | #define BATADV_FRAG_MAX_FRAG_SIZE 1400 |
146 | /* Time to keep fragments while waiting for rest of the fragments */ |
147 | #define BATADV_FRAG_TIMEOUT 10000 |
148 | |
149 | #define BATADV_DAT_CANDIDATE_NOT_FOUND 0 |
150 | #define BATADV_DAT_CANDIDATE_ORIG 1 |
151 | |
152 | /* Debug Messages */ |
153 | #ifdef pr_fmt |
154 | #undef pr_fmt |
155 | #endif |
156 | /* Append 'batman-adv: ' before kernel messages */ |
157 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
158 | |
159 | /* Kernel headers */ |
160 | |
161 | #include <linux/mutex.h> /* mutex */ |
162 | #include <linux/module.h> /* needed by all modules */ |
163 | #include <linux/netdevice.h> /* netdevice */ |
164 | #include <linux/etherdevice.h> /* ethernet address classification */ |
165 | #include <linux/if_ether.h> /* ethernet header */ |
166 | #include <linux/poll.h> /* poll_table */ |
167 | #include <linux/kthread.h> /* kernel threads */ |
168 | #include <linux/pkt_sched.h> /* schedule types */ |
169 | #include <linux/workqueue.h> /* workqueue */ |
170 | #include <linux/percpu.h> |
171 | #include <linux/slab.h> |
172 | #include <net/sock.h> /* struct sock */ |
173 | #include <net/rtnetlink.h> |
174 | #include <linux/jiffies.h> |
175 | #include <linux/seq_file.h> |
176 | #include <linux/if_vlan.h> |
177 | |
178 | #include "types.h" |
179 | |
180 | #define BATADV_PRINT_VID(vid) (vid & BATADV_VLAN_HAS_TAG ? \ |
181 | (int)(vid & VLAN_VID_MASK) : -1) |
182 | |
183 | extern char batadv_routing_algo[]; |
184 | extern struct list_head batadv_hardif_list; |
185 | |
186 | extern unsigned char batadv_broadcast_addr[]; |
187 | extern struct workqueue_struct *batadv_event_workqueue; |
188 | |
189 | int batadv_mesh_init(struct net_device *soft_iface); |
190 | void batadv_mesh_free(struct net_device *soft_iface); |
191 | int batadv_is_my_mac(struct batadv_priv *bat_priv, const uint8_t *addr); |
192 | struct batadv_hard_iface * |
193 | batadv_seq_print_text_primary_if_get(struct seq_file *seq); |
194 | int batadv_max_header_len(void); |
195 | void batadv_skb_set_priority(struct sk_buff *skb, int offset); |
196 | int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev, |
197 | struct packet_type *ptype, |
198 | struct net_device *orig_dev); |
199 | int |
200 | batadv_recv_handler_register(uint8_t packet_type, |
201 | int (*recv_handler)(struct sk_buff *, |
202 | struct batadv_hard_iface *)); |
203 | void batadv_recv_handler_unregister(uint8_t packet_type); |
204 | int batadv_algo_register(struct batadv_algo_ops *bat_algo_ops); |
205 | int batadv_algo_select(struct batadv_priv *bat_priv, char *name); |
206 | int batadv_algo_seq_print_text(struct seq_file *seq, void *offset); |
207 | __be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr); |
208 | |
209 | /** |
210 | * enum batadv_dbg_level - available log levels |
211 | * @BATADV_DBG_BATMAN: OGM and TQ computations related messages |
212 | * @BATADV_DBG_ROUTES: route added / changed / deleted |
213 | * @BATADV_DBG_TT: translation table messages |
214 | * @BATADV_DBG_BLA: bridge loop avoidance messages |
215 | * @BATADV_DBG_DAT: ARP snooping and DAT related messages |
216 | * @BATADV_DBG_NC: network coding related messages |
217 | * @BATADV_DBG_ALL: the union of all the above log levels |
218 | */ |
219 | enum batadv_dbg_level { |
220 | BATADV_DBG_BATMAN = BIT(0), |
221 | BATADV_DBG_ROUTES = BIT(1), |
222 | BATADV_DBG_TT = BIT(2), |
223 | BATADV_DBG_BLA = BIT(3), |
224 | BATADV_DBG_DAT = BIT(4), |
225 | BATADV_DBG_NC = BIT(5), |
226 | BATADV_DBG_ALL = 63, |
227 | }; |
228 | |
229 | #ifdef CONFIG_BATMAN_ADV_DEBUG |
230 | int batadv_debug_log(struct batadv_priv *bat_priv, const char *fmt, ...) |
231 | __printf(2, 3); |
232 | |
233 | #define batadv_dbg(type, bat_priv, fmt, arg...) \ |
234 | do { \ |
235 | if (atomic_read(&bat_priv->log_level) & type) \ |
236 | batadv_debug_log(bat_priv, fmt, ## arg);\ |
237 | } \ |
238 | while (0) |
239 | #else /* !CONFIG_BATMAN_ADV_DEBUG */ |
240 | __printf(3, 4) |
241 | static inline void batadv_dbg(int type __always_unused, |
242 | struct batadv_priv *bat_priv __always_unused, |
243 | const char *fmt __always_unused, ...) |
244 | { |
245 | } |
246 | #endif |
247 | |
248 | #define batadv_info(net_dev, fmt, arg...) \ |
249 | do { \ |
250 | struct net_device *_netdev = (net_dev); \ |
251 | struct batadv_priv *_batpriv = netdev_priv(_netdev); \ |
252 | batadv_dbg(BATADV_DBG_ALL, _batpriv, fmt, ## arg); \ |
253 | pr_info("%s: " fmt, _netdev->name, ## arg); \ |
254 | } while (0) |
255 | #define batadv_err(net_dev, fmt, arg...) \ |
256 | do { \ |
257 | struct net_device *_netdev = (net_dev); \ |
258 | struct batadv_priv *_batpriv = netdev_priv(_netdev); \ |
259 | batadv_dbg(BATADV_DBG_ALL, _batpriv, fmt, ## arg); \ |
260 | pr_err("%s: " fmt, _netdev->name, ## arg); \ |
261 | } while (0) |
262 | |
263 | /* returns 1 if they are the same ethernet addr |
264 | * |
265 | * note: can't use ether_addr_equal() as it requires aligned memory |
266 | */ |
267 | static inline int batadv_compare_eth(const void *data1, const void *data2) |
268 | { |
269 | return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0); |
270 | } |
271 | |
272 | /** |
273 | * has_timed_out - compares current time (jiffies) and timestamp + timeout |
274 | * @timestamp: base value to compare with (in jiffies) |
275 | * @timeout: added to base value before comparing (in milliseconds) |
276 | * |
277 | * Returns true if current time is after timestamp + timeout |
278 | */ |
279 | static inline bool batadv_has_timed_out(unsigned long timestamp, |
280 | unsigned int timeout) |
281 | { |
282 | return time_is_before_jiffies(timestamp + msecs_to_jiffies(timeout)); |
283 | } |
284 | |
285 | #define batadv_atomic_dec_not_zero(v) atomic_add_unless((v), -1, 0) |
286 | |
287 | /* Returns the smallest signed integer in two's complement with the sizeof x */ |
288 | #define batadv_smallest_signed_int(x) (1u << (7u + 8u * (sizeof(x) - 1u))) |
289 | |
290 | /* Checks if a sequence number x is a predecessor/successor of y. |
291 | * they handle overflows/underflows and can correctly check for a |
292 | * predecessor/successor unless the variable sequence number has grown by |
293 | * more then 2**(bitwidth(x)-1)-1. |
294 | * This means that for a uint8_t with the maximum value 255, it would think: |
295 | * - when adding nothing - it is neither a predecessor nor a successor |
296 | * - before adding more than 127 to the starting value - it is a predecessor, |
297 | * - when adding 128 - it is neither a predecessor nor a successor, |
298 | * - after adding more than 127 to the starting value - it is a successor |
299 | */ |
300 | #define batadv_seq_before(x, y) ({typeof(x) _d1 = (x); \ |
301 | typeof(y) _d2 = (y); \ |
302 | typeof(x) _dummy = (_d1 - _d2); \ |
303 | (void) (&_d1 == &_d2); \ |
304 | _dummy > batadv_smallest_signed_int(_dummy); }) |
305 | #define batadv_seq_after(x, y) batadv_seq_before(y, x) |
306 | |
307 | /* Stop preemption on local cpu while incrementing the counter */ |
308 | static inline void batadv_add_counter(struct batadv_priv *bat_priv, size_t idx, |
309 | size_t count) |
310 | { |
311 | this_cpu_add(bat_priv->bat_counters[idx], count); |
312 | } |
313 | |
314 | #define batadv_inc_counter(b, i) batadv_add_counter(b, i, 1) |
315 | |
316 | /* Sum and return the cpu-local counters for index 'idx' */ |
317 | static inline uint64_t batadv_sum_counter(struct batadv_priv *bat_priv, |
318 | size_t idx) |
319 | { |
320 | uint64_t *counters, sum = 0; |
321 | int cpu; |
322 | |
323 | for_each_possible_cpu(cpu) { |
324 | counters = per_cpu_ptr(bat_priv->bat_counters, cpu); |
325 | sum += counters[idx]; |
326 | } |
327 | |
328 | return sum; |
329 | } |
330 | |
331 | /* Define a macro to reach the control buffer of the skb. The members of the |
332 | * control buffer are defined in struct batadv_skb_cb in types.h. |
333 | * The macro is inspired by the similar macro TCP_SKB_CB() in tcp.h. |
334 | */ |
335 | #define BATADV_SKB_CB(__skb) ((struct batadv_skb_cb *)&((__skb)->cb[0])) |
336 | |
337 | void batadv_tvlv_container_register(struct batadv_priv *bat_priv, |
338 | uint8_t type, uint8_t version, |
339 | void *tvlv_value, uint16_t tvlv_value_len); |
340 | uint16_t batadv_tvlv_container_ogm_append(struct batadv_priv *bat_priv, |
341 | unsigned char **packet_buff, |
342 | int *packet_buff_len, |
343 | int packet_min_len); |
344 | void batadv_tvlv_ogm_receive(struct batadv_priv *bat_priv, |
345 | struct batadv_ogm_packet *batadv_ogm_packet, |
346 | struct batadv_orig_node *orig_node); |
347 | void batadv_tvlv_container_unregister(struct batadv_priv *bat_priv, |
348 | uint8_t type, uint8_t version); |
349 | |
350 | void batadv_tvlv_handler_register(struct batadv_priv *bat_priv, |
351 | void (*optr)(struct batadv_priv *bat_priv, |
352 | struct batadv_orig_node *orig, |
353 | uint8_t flags, |
354 | void *tvlv_value, |
355 | uint16_t tvlv_value_len), |
356 | int (*uptr)(struct batadv_priv *bat_priv, |
357 | uint8_t *src, uint8_t *dst, |
358 | void *tvlv_value, |
359 | uint16_t tvlv_value_len), |
360 | uint8_t type, uint8_t version, uint8_t flags); |
361 | void batadv_tvlv_handler_unregister(struct batadv_priv *bat_priv, |
362 | uint8_t type, uint8_t version); |
363 | int batadv_tvlv_containers_process(struct batadv_priv *bat_priv, |
364 | bool ogm_source, |
365 | struct batadv_orig_node *orig_node, |
366 | uint8_t *src, uint8_t *dst, |
367 | void *tvlv_buff, uint16_t tvlv_buff_len); |
368 | void batadv_tvlv_unicast_send(struct batadv_priv *bat_priv, uint8_t *src, |
369 | uint8_t *dst, uint8_t type, uint8_t version, |
370 | void *tvlv_value, uint16_t tvlv_value_len); |
371 | unsigned short batadv_get_vid(struct sk_buff *skb, size_t header_len); |
372 | |
373 | #endif /* _NET_BATMAN_ADV_MAIN_H_ */ |
374 |
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