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Commit | Line | Data |
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7db7d9f3 | 1 | // SPDX-License-Identifier: GPL-2.0 |
cfa55c6d | 2 | /* Copyright (C) B.A.T.M.A.N. contributors: |
0da00359 AQ |
3 | * |
4 | * Antonio Quartulli | |
0da00359 AQ |
5 | */ |
6 | ||
7 | #include "bat_v_ogm.h" | |
8 | #include "main.h" | |
9 | ||
10 | #include <linux/atomic.h> | |
11 | #include <linux/byteorder/generic.h> | |
12 | #include <linux/errno.h> | |
13 | #include <linux/etherdevice.h> | |
b92b94ac | 14 | #include <linux/gfp.h> |
0da00359 AQ |
15 | #include <linux/if_ether.h> |
16 | #include <linux/jiffies.h> | |
17 | #include <linux/kernel.h> | |
27353446 | 18 | #include <linux/kref.h> |
9323158e | 19 | #include <linux/list.h> |
f89255a0 | 20 | #include <linux/lockdep.h> |
fcd193e1 | 21 | #include <linux/minmax.h> |
a8d23cbb | 22 | #include <linux/mutex.h> |
0da00359 | 23 | #include <linux/netdevice.h> |
0093870a | 24 | #include <linux/prandom.h> |
0da00359 AQ |
25 | #include <linux/random.h> |
26 | #include <linux/rculist.h> | |
27 | #include <linux/rcupdate.h> | |
28 | #include <linux/skbuff.h> | |
29 | #include <linux/slab.h> | |
f89255a0 | 30 | #include <linux/spinlock.h> |
0da00359 AQ |
31 | #include <linux/stddef.h> |
32 | #include <linux/string.h> | |
33 | #include <linux/types.h> | |
34 | #include <linux/workqueue.h> | |
fec149f5 | 35 | #include <uapi/linux/batadv_packet.h> |
0da00359 | 36 | |
01d350d1 | 37 | #include "bat_algo.h" |
0da00359 | 38 | #include "hard-interface.h" |
9323158e | 39 | #include "hash.h" |
ba412080 | 40 | #include "log.h" |
9323158e | 41 | #include "originator.h" |
0da00359 AQ |
42 | #include "routing.h" |
43 | #include "send.h" | |
44 | #include "translation-table.h" | |
1f8dce49 | 45 | #include "tvlv.h" |
0da00359 | 46 | |
9323158e | 47 | /** |
7e9a8c2c | 48 | * batadv_v_ogm_orig_get() - retrieve and possibly create an originator node |
9323158e AQ |
49 | * @bat_priv: the bat priv with all the soft interface information |
50 | * @addr: the address of the originator | |
51 | * | |
bccb48c8 SE |
52 | * Return: the orig_node corresponding to the specified address. If such an |
53 | * object does not exist, it is allocated here. In case of allocation failure | |
54 | * returns NULL. | |
9323158e AQ |
55 | */ |
56 | struct batadv_orig_node *batadv_v_ogm_orig_get(struct batadv_priv *bat_priv, | |
57 | const u8 *addr) | |
58 | { | |
59 | struct batadv_orig_node *orig_node; | |
60 | int hash_added; | |
61 | ||
62 | orig_node = batadv_orig_hash_find(bat_priv, addr); | |
63 | if (orig_node) | |
64 | return orig_node; | |
65 | ||
66 | orig_node = batadv_orig_node_new(bat_priv, addr); | |
67 | if (!orig_node) | |
68 | return NULL; | |
69 | ||
55db2d59 | 70 | kref_get(&orig_node->refcount); |
9323158e AQ |
71 | hash_added = batadv_hash_add(bat_priv->orig_hash, batadv_compare_orig, |
72 | batadv_choose_orig, orig_node, | |
73 | &orig_node->hash_entry); | |
74 | if (hash_added != 0) { | |
55db2d59 | 75 | /* remove refcnt for newly created orig_node and hash entry */ |
9323158e AQ |
76 | batadv_orig_node_put(orig_node); |
77 | batadv_orig_node_put(orig_node); | |
78 | orig_node = NULL; | |
79 | } | |
80 | ||
81 | return orig_node; | |
82 | } | |
83 | ||
f89255a0 LL |
84 | /** |
85 | * batadv_v_ogm_start_queue_timer() - restart the OGM aggregation timer | |
86 | * @hard_iface: the interface to use to send the OGM | |
87 | */ | |
88 | static void batadv_v_ogm_start_queue_timer(struct batadv_hard_iface *hard_iface) | |
89 | { | |
90 | unsigned int msecs = BATADV_MAX_AGGREGATION_MS * 1000; | |
91 | ||
92 | /* msecs * [0.9, 1.1] */ | |
26893e7e | 93 | msecs += prandom_u32_max(msecs / 5) - (msecs / 10); |
f89255a0 LL |
94 | queue_delayed_work(batadv_event_workqueue, &hard_iface->bat_v.aggr_wq, |
95 | msecs_to_jiffies(msecs / 1000)); | |
96 | } | |
97 | ||
0da00359 | 98 | /** |
7e9a8c2c | 99 | * batadv_v_ogm_start_timer() - restart the OGM sending timer |
0da00359 AQ |
100 | * @bat_priv: the bat priv with all the soft interface information |
101 | */ | |
102 | static void batadv_v_ogm_start_timer(struct batadv_priv *bat_priv) | |
103 | { | |
104 | unsigned long msecs; | |
105 | /* this function may be invoked in different contexts (ogm rescheduling | |
106 | * or hard_iface activation), but the work timer should not be reset | |
107 | */ | |
108 | if (delayed_work_pending(&bat_priv->bat_v.ogm_wq)) | |
109 | return; | |
110 | ||
111 | msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER; | |
26893e7e | 112 | msecs += prandom_u32_max(2 * BATADV_JITTER); |
0da00359 AQ |
113 | queue_delayed_work(batadv_event_workqueue, &bat_priv->bat_v.ogm_wq, |
114 | msecs_to_jiffies(msecs)); | |
115 | } | |
116 | ||
117 | /** | |
7e9a8c2c | 118 | * batadv_v_ogm_send_to_if() - send a batman ogm using a given interface |
0da00359 AQ |
119 | * @skb: the OGM to send |
120 | * @hard_iface: the interface to use to send the OGM | |
121 | */ | |
122 | static void batadv_v_ogm_send_to_if(struct sk_buff *skb, | |
123 | struct batadv_hard_iface *hard_iface) | |
124 | { | |
125 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); | |
126 | ||
127 | if (hard_iface->if_status != BATADV_IF_ACTIVE) | |
128 | return; | |
129 | ||
130 | batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX); | |
131 | batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES, | |
132 | skb->len + ETH_HLEN); | |
133 | ||
95d39278 | 134 | batadv_send_broadcast_skb(skb, hard_iface); |
0da00359 AQ |
135 | } |
136 | ||
f89255a0 LL |
137 | /** |
138 | * batadv_v_ogm_len() - OGMv2 packet length | |
139 | * @skb: the OGM to check | |
140 | * | |
141 | * Return: Length of the given OGMv2 packet, including tvlv length, excluding | |
142 | * ethernet header length. | |
143 | */ | |
144 | static unsigned int batadv_v_ogm_len(struct sk_buff *skb) | |
145 | { | |
146 | struct batadv_ogm2_packet *ogm_packet; | |
147 | ||
148 | ogm_packet = (struct batadv_ogm2_packet *)skb->data; | |
149 | return BATADV_OGM2_HLEN + ntohs(ogm_packet->tvlv_len); | |
150 | } | |
151 | ||
152 | /** | |
153 | * batadv_v_ogm_queue_left() - check if given OGM still fits aggregation queue | |
154 | * @skb: the OGM to check | |
155 | * @hard_iface: the interface to use to send the OGM | |
156 | * | |
baa1e8a0 | 157 | * Caller needs to hold the hard_iface->bat_v.aggr_list.lock. |
f89255a0 LL |
158 | * |
159 | * Return: True, if the given OGMv2 packet still fits, false otherwise. | |
160 | */ | |
161 | static bool batadv_v_ogm_queue_left(struct sk_buff *skb, | |
162 | struct batadv_hard_iface *hard_iface) | |
163 | { | |
164 | unsigned int max = min_t(unsigned int, hard_iface->net_dev->mtu, | |
165 | BATADV_MAX_AGGREGATION_BYTES); | |
166 | unsigned int ogm_len = batadv_v_ogm_len(skb); | |
167 | ||
baa1e8a0 | 168 | lockdep_assert_held(&hard_iface->bat_v.aggr_list.lock); |
f89255a0 LL |
169 | |
170 | return hard_iface->bat_v.aggr_len + ogm_len <= max; | |
171 | } | |
172 | ||
173 | /** | |
174 | * batadv_v_ogm_aggr_list_free - free all elements in an aggregation queue | |
175 | * @hard_iface: the interface holding the aggregation queue | |
176 | * | |
bccb48c8 | 177 | * Empties the OGMv2 aggregation queue and frees all the skbs it contains. |
f89255a0 | 178 | * |
baa1e8a0 | 179 | * Caller needs to hold the hard_iface->bat_v.aggr_list.lock. |
f89255a0 LL |
180 | */ |
181 | static void batadv_v_ogm_aggr_list_free(struct batadv_hard_iface *hard_iface) | |
182 | { | |
baa1e8a0 | 183 | lockdep_assert_held(&hard_iface->bat_v.aggr_list.lock); |
f89255a0 | 184 | |
baa1e8a0 | 185 | __skb_queue_purge(&hard_iface->bat_v.aggr_list); |
f89255a0 LL |
186 | hard_iface->bat_v.aggr_len = 0; |
187 | } | |
188 | ||
189 | /** | |
190 | * batadv_v_ogm_aggr_send() - flush & send aggregation queue | |
191 | * @hard_iface: the interface with the aggregation queue to flush | |
192 | * | |
9cb9a178 LL |
193 | * Aggregates all OGMv2 packets currently in the aggregation queue into a |
194 | * single OGMv2 packet and transmits this aggregate. | |
195 | * | |
196 | * The aggregation queue is empty after this call. | |
197 | * | |
baa1e8a0 | 198 | * Caller needs to hold the hard_iface->bat_v.aggr_list.lock. |
f89255a0 LL |
199 | */ |
200 | static void batadv_v_ogm_aggr_send(struct batadv_hard_iface *hard_iface) | |
201 | { | |
9cb9a178 LL |
202 | unsigned int aggr_len = hard_iface->bat_v.aggr_len; |
203 | struct sk_buff *skb_aggr; | |
204 | unsigned int ogm_len; | |
f89255a0 LL |
205 | struct sk_buff *skb; |
206 | ||
baa1e8a0 | 207 | lockdep_assert_held(&hard_iface->bat_v.aggr_list.lock); |
f89255a0 | 208 | |
9cb9a178 LL |
209 | if (!aggr_len) |
210 | return; | |
211 | ||
212 | skb_aggr = dev_alloc_skb(aggr_len + ETH_HLEN + NET_IP_ALIGN); | |
213 | if (!skb_aggr) { | |
214 | batadv_v_ogm_aggr_list_free(hard_iface); | |
215 | return; | |
216 | } | |
217 | ||
218 | skb_reserve(skb_aggr, ETH_HLEN + NET_IP_ALIGN); | |
219 | skb_reset_network_header(skb_aggr); | |
220 | ||
baa1e8a0 | 221 | while ((skb = __skb_dequeue(&hard_iface->bat_v.aggr_list))) { |
f89255a0 | 222 | hard_iface->bat_v.aggr_len -= batadv_v_ogm_len(skb); |
9cb9a178 LL |
223 | |
224 | ogm_len = batadv_v_ogm_len(skb); | |
225 | skb_put_data(skb_aggr, skb->data, ogm_len); | |
226 | ||
227 | consume_skb(skb); | |
f89255a0 | 228 | } |
9cb9a178 LL |
229 | |
230 | batadv_v_ogm_send_to_if(skb_aggr, hard_iface); | |
f89255a0 LL |
231 | } |
232 | ||
233 | /** | |
234 | * batadv_v_ogm_queue_on_if() - queue a batman ogm on a given interface | |
235 | * @skb: the OGM to queue | |
236 | * @hard_iface: the interface to queue the OGM on | |
237 | */ | |
238 | static void batadv_v_ogm_queue_on_if(struct sk_buff *skb, | |
239 | struct batadv_hard_iface *hard_iface) | |
240 | { | |
241 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); | |
242 | ||
243 | if (!atomic_read(&bat_priv->aggregated_ogms)) { | |
244 | batadv_v_ogm_send_to_if(skb, hard_iface); | |
245 | return; | |
246 | } | |
247 | ||
baa1e8a0 | 248 | spin_lock_bh(&hard_iface->bat_v.aggr_list.lock); |
f89255a0 LL |
249 | if (!batadv_v_ogm_queue_left(skb, hard_iface)) |
250 | batadv_v_ogm_aggr_send(hard_iface); | |
251 | ||
252 | hard_iface->bat_v.aggr_len += batadv_v_ogm_len(skb); | |
baa1e8a0 CJ |
253 | __skb_queue_tail(&hard_iface->bat_v.aggr_list, skb); |
254 | spin_unlock_bh(&hard_iface->bat_v.aggr_list.lock); | |
f89255a0 LL |
255 | } |
256 | ||
0da00359 | 257 | /** |
a8d23cbb SE |
258 | * batadv_v_ogm_send_softif() - periodic worker broadcasting the own OGM |
259 | * @bat_priv: the bat priv with all the soft interface information | |
0da00359 | 260 | */ |
a8d23cbb | 261 | static void batadv_v_ogm_send_softif(struct batadv_priv *bat_priv) |
0da00359 AQ |
262 | { |
263 | struct batadv_hard_iface *hard_iface; | |
0da00359 AQ |
264 | struct batadv_ogm2_packet *ogm_packet; |
265 | struct sk_buff *skb, *skb_tmp; | |
e04de486 | 266 | unsigned char *ogm_buff; |
0da00359 AQ |
267 | int ogm_buff_len; |
268 | u16 tvlv_len = 0; | |
3111beed | 269 | int ret; |
0da00359 | 270 | |
a8d23cbb | 271 | lockdep_assert_held(&bat_priv->bat_v.ogm_buff_mutex); |
0da00359 AQ |
272 | |
273 | if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING) | |
274 | goto out; | |
275 | ||
276 | ogm_buff = bat_priv->bat_v.ogm_buff; | |
277 | ogm_buff_len = bat_priv->bat_v.ogm_buff_len; | |
278 | /* tt changes have to be committed before the tvlv data is | |
279 | * appended as it may alter the tt tvlv container | |
280 | */ | |
281 | batadv_tt_local_commit_changes(bat_priv); | |
282 | tvlv_len = batadv_tvlv_container_ogm_append(bat_priv, &ogm_buff, | |
283 | &ogm_buff_len, | |
284 | BATADV_OGM2_HLEN); | |
285 | ||
286 | bat_priv->bat_v.ogm_buff = ogm_buff; | |
287 | bat_priv->bat_v.ogm_buff_len = ogm_buff_len; | |
288 | ||
289 | skb = netdev_alloc_skb_ip_align(NULL, ETH_HLEN + ogm_buff_len); | |
290 | if (!skb) | |
291 | goto reschedule; | |
292 | ||
293 | skb_reserve(skb, ETH_HLEN); | |
e04de486 | 294 | skb_put_data(skb, ogm_buff, ogm_buff_len); |
0da00359 AQ |
295 | |
296 | ogm_packet = (struct batadv_ogm2_packet *)skb->data; | |
297 | ogm_packet->seqno = htonl(atomic_read(&bat_priv->bat_v.ogm_seqno)); | |
298 | atomic_inc(&bat_priv->bat_v.ogm_seqno); | |
299 | ogm_packet->tvlv_len = htons(tvlv_len); | |
300 | ||
301 | /* broadcast on every interface */ | |
302 | rcu_read_lock(); | |
303 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { | |
304 | if (hard_iface->soft_iface != bat_priv->soft_iface) | |
305 | continue; | |
306 | ||
27353446 SE |
307 | if (!kref_get_unless_zero(&hard_iface->refcount)) |
308 | continue; | |
309 | ||
3111beed LL |
310 | ret = batadv_hardif_no_broadcast(hard_iface, NULL, NULL); |
311 | if (ret) { | |
312 | char *type; | |
313 | ||
314 | switch (ret) { | |
315 | case BATADV_HARDIF_BCAST_NORECIPIENT: | |
316 | type = "no neighbor"; | |
317 | break; | |
318 | case BATADV_HARDIF_BCAST_DUPFWD: | |
319 | type = "single neighbor is source"; | |
320 | break; | |
321 | case BATADV_HARDIF_BCAST_DUPORIG: | |
322 | type = "single neighbor is originator"; | |
323 | break; | |
324 | default: | |
325 | type = "unknown"; | |
326 | } | |
327 | ||
f25cbb2a | 328 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "OGM2 from ourselves on %s suppressed: %s\n", |
3111beed LL |
329 | hard_iface->net_dev->name, type); |
330 | ||
331 | batadv_hardif_put(hard_iface); | |
332 | continue; | |
333 | } | |
334 | ||
0da00359 AQ |
335 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
336 | "Sending own OGM2 packet (originator %pM, seqno %u, throughput %u, TTL %d) on interface %s [%pM]\n", | |
337 | ogm_packet->orig, ntohl(ogm_packet->seqno), | |
338 | ntohl(ogm_packet->throughput), ogm_packet->ttl, | |
339 | hard_iface->net_dev->name, | |
340 | hard_iface->net_dev->dev_addr); | |
341 | ||
342 | /* this skb gets consumed by batadv_v_ogm_send_to_if() */ | |
343 | skb_tmp = skb_clone(skb, GFP_ATOMIC); | |
27353446 SE |
344 | if (!skb_tmp) { |
345 | batadv_hardif_put(hard_iface); | |
0da00359 | 346 | break; |
27353446 | 347 | } |
0da00359 | 348 | |
f89255a0 | 349 | batadv_v_ogm_queue_on_if(skb_tmp, hard_iface); |
27353446 | 350 | batadv_hardif_put(hard_iface); |
0da00359 AQ |
351 | } |
352 | rcu_read_unlock(); | |
353 | ||
354 | consume_skb(skb); | |
355 | ||
356 | reschedule: | |
357 | batadv_v_ogm_start_timer(bat_priv); | |
358 | out: | |
359 | return; | |
360 | } | |
361 | ||
a8d23cbb SE |
362 | /** |
363 | * batadv_v_ogm_send() - periodic worker broadcasting the own OGM | |
364 | * @work: work queue item | |
365 | */ | |
366 | static void batadv_v_ogm_send(struct work_struct *work) | |
367 | { | |
368 | struct batadv_priv_bat_v *bat_v; | |
369 | struct batadv_priv *bat_priv; | |
370 | ||
371 | bat_v = container_of(work, struct batadv_priv_bat_v, ogm_wq.work); | |
372 | bat_priv = container_of(bat_v, struct batadv_priv, bat_v); | |
373 | ||
374 | mutex_lock(&bat_priv->bat_v.ogm_buff_mutex); | |
375 | batadv_v_ogm_send_softif(bat_priv); | |
376 | mutex_unlock(&bat_priv->bat_v.ogm_buff_mutex); | |
377 | } | |
378 | ||
f89255a0 LL |
379 | /** |
380 | * batadv_v_ogm_aggr_work() - OGM queue periodic task per interface | |
381 | * @work: work queue item | |
382 | * | |
bccb48c8 | 383 | * Emits aggregated OGM messages in regular intervals. |
f89255a0 LL |
384 | */ |
385 | void batadv_v_ogm_aggr_work(struct work_struct *work) | |
386 | { | |
387 | struct batadv_hard_iface_bat_v *batv; | |
388 | struct batadv_hard_iface *hard_iface; | |
389 | ||
390 | batv = container_of(work, struct batadv_hard_iface_bat_v, aggr_wq.work); | |
391 | hard_iface = container_of(batv, struct batadv_hard_iface, bat_v); | |
392 | ||
baa1e8a0 | 393 | spin_lock_bh(&hard_iface->bat_v.aggr_list.lock); |
f89255a0 | 394 | batadv_v_ogm_aggr_send(hard_iface); |
baa1e8a0 | 395 | spin_unlock_bh(&hard_iface->bat_v.aggr_list.lock); |
f89255a0 LL |
396 | |
397 | batadv_v_ogm_start_queue_timer(hard_iface); | |
398 | } | |
399 | ||
0da00359 | 400 | /** |
7e9a8c2c | 401 | * batadv_v_ogm_iface_enable() - prepare an interface for B.A.T.M.A.N. V |
0da00359 AQ |
402 | * @hard_iface: the interface to prepare |
403 | * | |
bccb48c8 | 404 | * Takes care of scheduling its own OGM sending routine for this interface. |
0da00359 AQ |
405 | * |
406 | * Return: 0 on success or a negative error code otherwise | |
407 | */ | |
408 | int batadv_v_ogm_iface_enable(struct batadv_hard_iface *hard_iface) | |
409 | { | |
410 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); | |
411 | ||
f89255a0 | 412 | batadv_v_ogm_start_queue_timer(hard_iface); |
0da00359 AQ |
413 | batadv_v_ogm_start_timer(bat_priv); |
414 | ||
415 | return 0; | |
416 | } | |
417 | ||
f89255a0 LL |
418 | /** |
419 | * batadv_v_ogm_iface_disable() - release OGM interface private resources | |
420 | * @hard_iface: interface for which the resources have to be released | |
421 | */ | |
422 | void batadv_v_ogm_iface_disable(struct batadv_hard_iface *hard_iface) | |
423 | { | |
424 | cancel_delayed_work_sync(&hard_iface->bat_v.aggr_wq); | |
425 | ||
baa1e8a0 | 426 | spin_lock_bh(&hard_iface->bat_v.aggr_list.lock); |
f89255a0 | 427 | batadv_v_ogm_aggr_list_free(hard_iface); |
baa1e8a0 | 428 | spin_unlock_bh(&hard_iface->bat_v.aggr_list.lock); |
f89255a0 LL |
429 | } |
430 | ||
0da00359 | 431 | /** |
7e9a8c2c | 432 | * batadv_v_ogm_primary_iface_set() - set a new primary interface |
0da00359 AQ |
433 | * @primary_iface: the new primary interface |
434 | */ | |
435 | void batadv_v_ogm_primary_iface_set(struct batadv_hard_iface *primary_iface) | |
436 | { | |
437 | struct batadv_priv *bat_priv = netdev_priv(primary_iface->soft_iface); | |
438 | struct batadv_ogm2_packet *ogm_packet; | |
439 | ||
a8d23cbb | 440 | mutex_lock(&bat_priv->bat_v.ogm_buff_mutex); |
0da00359 | 441 | if (!bat_priv->bat_v.ogm_buff) |
a8d23cbb | 442 | goto unlock; |
0da00359 AQ |
443 | |
444 | ogm_packet = (struct batadv_ogm2_packet *)bat_priv->bat_v.ogm_buff; | |
445 | ether_addr_copy(ogm_packet->orig, primary_iface->net_dev->dev_addr); | |
a8d23cbb SE |
446 | |
447 | unlock: | |
448 | mutex_unlock(&bat_priv->bat_v.ogm_buff_mutex); | |
0da00359 AQ |
449 | } |
450 | ||
9323158e | 451 | /** |
7e9a8c2c SE |
452 | * batadv_v_forward_penalty() - apply a penalty to the throughput metric |
453 | * forwarded with B.A.T.M.A.N. V OGMs | |
9323158e AQ |
454 | * @bat_priv: the bat priv with all the soft interface information |
455 | * @if_incoming: the interface where the OGM has been received | |
456 | * @if_outgoing: the interface where the OGM has to be forwarded to | |
457 | * @throughput: the current throughput | |
458 | * | |
459 | * Apply a penalty on the current throughput metric value based on the | |
3bda14d0 LL |
460 | * characteristic of the interface where the OGM has been received. |
461 | * | |
462 | * Initially the per hardif hop penalty is applied to the throughput. After | |
463 | * that the return value is then computed as follows: | |
9323158e AQ |
464 | * - throughput * 50% if the incoming and outgoing interface are the |
465 | * same WiFi interface and the throughput is above | |
466 | * 1MBit/s | |
467 | * - throughput if the outgoing interface is the default | |
468 | * interface (i.e. this OGM is processed for the | |
469 | * internal table and not forwarded) | |
3bda14d0 | 470 | * - throughput * node hop penalty otherwise |
9323158e AQ |
471 | * |
472 | * Return: the penalised throughput metric. | |
473 | */ | |
474 | static u32 batadv_v_forward_penalty(struct batadv_priv *bat_priv, | |
475 | struct batadv_hard_iface *if_incoming, | |
476 | struct batadv_hard_iface *if_outgoing, | |
477 | u32 throughput) | |
478 | { | |
3bda14d0 | 479 | int if_hop_penalty = atomic_read(&if_incoming->hop_penalty); |
9323158e AQ |
480 | int hop_penalty = atomic_read(&bat_priv->hop_penalty); |
481 | int hop_penalty_max = BATADV_TQ_MAX_VALUE; | |
482 | ||
3bda14d0 LL |
483 | /* Apply per hardif hop penalty */ |
484 | throughput = throughput * (hop_penalty_max - if_hop_penalty) / | |
485 | hop_penalty_max; | |
486 | ||
9323158e AQ |
487 | /* Don't apply hop penalty in default originator table. */ |
488 | if (if_outgoing == BATADV_IF_DEFAULT) | |
489 | return throughput; | |
490 | ||
491 | /* Forwarding on the same WiFi interface cuts the throughput in half | |
492 | * due to the store & forward characteristics of WIFI. | |
493 | * Very low throughput values are the exception. | |
494 | */ | |
825ffe1f SE |
495 | if (throughput > 10 && |
496 | if_incoming == if_outgoing && | |
c833484e | 497 | !(if_incoming->bat_v.flags & BATADV_FULL_DUPLEX)) |
9323158e AQ |
498 | return throughput / 2; |
499 | ||
500 | /* hop penalty of 255 equals 100% */ | |
501 | return throughput * (hop_penalty_max - hop_penalty) / hop_penalty_max; | |
502 | } | |
503 | ||
504 | /** | |
7e9a8c2c | 505 | * batadv_v_ogm_forward() - check conditions and forward an OGM to the given |
efcc9d30 | 506 | * outgoing interface |
9323158e AQ |
507 | * @bat_priv: the bat priv with all the soft interface information |
508 | * @ogm_received: previously received OGM to be forwarded | |
efcc9d30 SW |
509 | * @orig_node: the originator which has been updated |
510 | * @neigh_node: the neigh_node through with the OGM has been received | |
9323158e AQ |
511 | * @if_incoming: the interface on which this OGM was received on |
512 | * @if_outgoing: the interface to which the OGM has to be forwarded to | |
513 | * | |
514 | * Forward an OGM to an interface after having altered the throughput metric and | |
515 | * the TTL value contained in it. The original OGM isn't modified. | |
516 | */ | |
517 | static void batadv_v_ogm_forward(struct batadv_priv *bat_priv, | |
518 | const struct batadv_ogm2_packet *ogm_received, | |
efcc9d30 SW |
519 | struct batadv_orig_node *orig_node, |
520 | struct batadv_neigh_node *neigh_node, | |
9323158e AQ |
521 | struct batadv_hard_iface *if_incoming, |
522 | struct batadv_hard_iface *if_outgoing) | |
523 | { | |
efcc9d30 SW |
524 | struct batadv_neigh_ifinfo *neigh_ifinfo = NULL; |
525 | struct batadv_orig_ifinfo *orig_ifinfo = NULL; | |
526 | struct batadv_neigh_node *router = NULL; | |
9323158e AQ |
527 | struct batadv_ogm2_packet *ogm_forward; |
528 | unsigned char *skb_buff; | |
529 | struct sk_buff *skb; | |
530 | size_t packet_len; | |
531 | u16 tvlv_len; | |
532 | ||
efcc9d30 SW |
533 | /* only forward for specific interfaces, not for the default one. */ |
534 | if (if_outgoing == BATADV_IF_DEFAULT) | |
535 | goto out; | |
536 | ||
537 | orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing); | |
538 | if (!orig_ifinfo) | |
539 | goto out; | |
540 | ||
541 | /* acquire possibly updated router */ | |
542 | router = batadv_orig_router_get(orig_node, if_outgoing); | |
543 | ||
544 | /* strict rule: forward packets coming from the best next hop only */ | |
545 | if (neigh_node != router) | |
546 | goto out; | |
547 | ||
548 | /* don't forward the same seqno twice on one interface */ | |
549 | if (orig_ifinfo->last_seqno_forwarded == ntohl(ogm_received->seqno)) | |
550 | goto out; | |
551 | ||
552 | orig_ifinfo->last_seqno_forwarded = ntohl(ogm_received->seqno); | |
553 | ||
9323158e AQ |
554 | if (ogm_received->ttl <= 1) { |
555 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n"); | |
efcc9d30 | 556 | goto out; |
9323158e AQ |
557 | } |
558 | ||
efcc9d30 SW |
559 | neigh_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing); |
560 | if (!neigh_ifinfo) | |
561 | goto out; | |
562 | ||
9323158e AQ |
563 | tvlv_len = ntohs(ogm_received->tvlv_len); |
564 | ||
565 | packet_len = BATADV_OGM2_HLEN + tvlv_len; | |
566 | skb = netdev_alloc_skb_ip_align(if_outgoing->net_dev, | |
567 | ETH_HLEN + packet_len); | |
568 | if (!skb) | |
efcc9d30 | 569 | goto out; |
9323158e AQ |
570 | |
571 | skb_reserve(skb, ETH_HLEN); | |
59ae1d12 | 572 | skb_buff = skb_put_data(skb, ogm_received, packet_len); |
9323158e AQ |
573 | |
574 | /* apply forward penalty */ | |
575 | ogm_forward = (struct batadv_ogm2_packet *)skb_buff; | |
efcc9d30 | 576 | ogm_forward->throughput = htonl(neigh_ifinfo->bat_v.throughput); |
9323158e AQ |
577 | ogm_forward->ttl--; |
578 | ||
579 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
580 | "Forwarding OGM2 packet on %s: throughput %u, ttl %u, received via %s\n", | |
efcc9d30 SW |
581 | if_outgoing->net_dev->name, ntohl(ogm_forward->throughput), |
582 | ogm_forward->ttl, if_incoming->net_dev->name); | |
9323158e | 583 | |
f89255a0 | 584 | batadv_v_ogm_queue_on_if(skb, if_outgoing); |
efcc9d30 SW |
585 | |
586 | out: | |
79a0bffb SE |
587 | batadv_orig_ifinfo_put(orig_ifinfo); |
588 | batadv_neigh_node_put(router); | |
589 | batadv_neigh_ifinfo_put(neigh_ifinfo); | |
9323158e AQ |
590 | } |
591 | ||
592 | /** | |
7e9a8c2c | 593 | * batadv_v_ogm_metric_update() - update route metric based on OGM |
9323158e AQ |
594 | * @bat_priv: the bat priv with all the soft interface information |
595 | * @ogm2: OGM2 structure | |
596 | * @orig_node: Originator structure for which the OGM has been received | |
597 | * @neigh_node: the neigh_node through with the OGM has been received | |
598 | * @if_incoming: the interface where this packet was received | |
599 | * @if_outgoing: the interface for which the packet should be considered | |
600 | * | |
601 | * Return: | |
602 | * 1 if the OGM is new, | |
603 | * 0 if it is not new but valid, | |
604 | * <0 on error (e.g. old OGM) | |
605 | */ | |
606 | static int batadv_v_ogm_metric_update(struct batadv_priv *bat_priv, | |
607 | const struct batadv_ogm2_packet *ogm2, | |
608 | struct batadv_orig_node *orig_node, | |
609 | struct batadv_neigh_node *neigh_node, | |
610 | struct batadv_hard_iface *if_incoming, | |
611 | struct batadv_hard_iface *if_outgoing) | |
612 | { | |
422d2f77 | 613 | struct batadv_orig_ifinfo *orig_ifinfo; |
9323158e AQ |
614 | struct batadv_neigh_ifinfo *neigh_ifinfo = NULL; |
615 | bool protection_started = false; | |
616 | int ret = -EINVAL; | |
617 | u32 path_throughput; | |
618 | s32 seq_diff; | |
619 | ||
620 | orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing); | |
621 | if (!orig_ifinfo) | |
622 | goto out; | |
623 | ||
624 | seq_diff = ntohl(ogm2->seqno) - orig_ifinfo->last_real_seqno; | |
625 | ||
626 | if (!hlist_empty(&orig_node->neigh_list) && | |
627 | batadv_window_protected(bat_priv, seq_diff, | |
628 | BATADV_OGM_MAX_AGE, | |
629 | &orig_ifinfo->batman_seqno_reset, | |
630 | &protection_started)) { | |
631 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
632 | "Drop packet: packet within window protection time from %pM\n", | |
633 | ogm2->orig); | |
634 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
635 | "Last reset: %ld, %ld\n", | |
636 | orig_ifinfo->batman_seqno_reset, jiffies); | |
637 | goto out; | |
638 | } | |
639 | ||
640 | /* drop packets with old seqnos, however accept the first packet after | |
641 | * a host has been rebooted. | |
642 | */ | |
825ffe1f | 643 | if (seq_diff < 0 && !protection_started) |
9323158e AQ |
644 | goto out; |
645 | ||
646 | neigh_node->last_seen = jiffies; | |
647 | ||
648 | orig_node->last_seen = jiffies; | |
649 | ||
650 | orig_ifinfo->last_real_seqno = ntohl(ogm2->seqno); | |
651 | orig_ifinfo->last_ttl = ogm2->ttl; | |
652 | ||
653 | neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing); | |
654 | if (!neigh_ifinfo) | |
655 | goto out; | |
656 | ||
657 | path_throughput = batadv_v_forward_penalty(bat_priv, if_incoming, | |
658 | if_outgoing, | |
659 | ntohl(ogm2->throughput)); | |
660 | neigh_ifinfo->bat_v.throughput = path_throughput; | |
661 | neigh_ifinfo->bat_v.last_seqno = ntohl(ogm2->seqno); | |
662 | neigh_ifinfo->last_ttl = ogm2->ttl; | |
663 | ||
664 | if (seq_diff > 0 || protection_started) | |
665 | ret = 1; | |
666 | else | |
667 | ret = 0; | |
668 | out: | |
79a0bffb SE |
669 | batadv_orig_ifinfo_put(orig_ifinfo); |
670 | batadv_neigh_ifinfo_put(neigh_ifinfo); | |
9323158e AQ |
671 | |
672 | return ret; | |
673 | } | |
674 | ||
675 | /** | |
7e9a8c2c | 676 | * batadv_v_ogm_route_update() - update routes based on OGM |
9323158e AQ |
677 | * @bat_priv: the bat priv with all the soft interface information |
678 | * @ethhdr: the Ethernet header of the OGM2 | |
679 | * @ogm2: OGM2 structure | |
680 | * @orig_node: Originator structure for which the OGM has been received | |
681 | * @neigh_node: the neigh_node through with the OGM has been received | |
682 | * @if_incoming: the interface where this packet was received | |
683 | * @if_outgoing: the interface for which the packet should be considered | |
efcc9d30 SW |
684 | * |
685 | * Return: true if the packet should be forwarded, false otherwise | |
9323158e | 686 | */ |
efcc9d30 | 687 | static bool batadv_v_ogm_route_update(struct batadv_priv *bat_priv, |
9323158e AQ |
688 | const struct ethhdr *ethhdr, |
689 | const struct batadv_ogm2_packet *ogm2, | |
690 | struct batadv_orig_node *orig_node, | |
691 | struct batadv_neigh_node *neigh_node, | |
692 | struct batadv_hard_iface *if_incoming, | |
693 | struct batadv_hard_iface *if_outgoing) | |
694 | { | |
695 | struct batadv_neigh_node *router = NULL; | |
422d2f77 | 696 | struct batadv_orig_node *orig_neigh_node; |
9323158e | 697 | struct batadv_neigh_node *orig_neigh_router = NULL; |
86de37c1 SW |
698 | struct batadv_neigh_ifinfo *router_ifinfo = NULL, *neigh_ifinfo = NULL; |
699 | u32 router_throughput, neigh_throughput; | |
700 | u32 router_last_seqno; | |
701 | u32 neigh_last_seqno; | |
702 | s32 neigh_seq_diff; | |
efcc9d30 | 703 | bool forward = false; |
9323158e AQ |
704 | |
705 | orig_neigh_node = batadv_v_ogm_orig_get(bat_priv, ethhdr->h_source); | |
706 | if (!orig_neigh_node) | |
707 | goto out; | |
708 | ||
709 | orig_neigh_router = batadv_orig_router_get(orig_neigh_node, | |
710 | if_outgoing); | |
711 | ||
712 | /* drop packet if sender is not a direct neighbor and if we | |
713 | * don't route towards it | |
714 | */ | |
715 | router = batadv_orig_router_get(orig_node, if_outgoing); | |
716 | if (router && router->orig_node != orig_node && !orig_neigh_router) { | |
717 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
718 | "Drop packet: OGM via unknown neighbor!\n"); | |
719 | goto out; | |
720 | } | |
721 | ||
86de37c1 SW |
722 | /* Mark the OGM to be considered for forwarding, and update routes |
723 | * if needed. | |
724 | */ | |
efcc9d30 | 725 | forward = true; |
86de37c1 SW |
726 | |
727 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
728 | "Searching and updating originator entry of received packet\n"); | |
729 | ||
730 | /* if this neighbor already is our next hop there is nothing | |
731 | * to change | |
732 | */ | |
733 | if (router == neigh_node) | |
734 | goto out; | |
735 | ||
736 | /* don't consider neighbours with worse throughput. | |
737 | * also switch route if this seqno is BATADV_V_MAX_ORIGDIFF newer than | |
738 | * the last received seqno from our best next hop. | |
739 | */ | |
740 | if (router) { | |
741 | router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing); | |
742 | neigh_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing); | |
743 | ||
744 | /* if these are not allocated, something is wrong. */ | |
745 | if (!router_ifinfo || !neigh_ifinfo) | |
746 | goto out; | |
747 | ||
748 | neigh_last_seqno = neigh_ifinfo->bat_v.last_seqno; | |
749 | router_last_seqno = router_ifinfo->bat_v.last_seqno; | |
750 | neigh_seq_diff = neigh_last_seqno - router_last_seqno; | |
751 | router_throughput = router_ifinfo->bat_v.throughput; | |
752 | neigh_throughput = neigh_ifinfo->bat_v.throughput; | |
753 | ||
825ffe1f SE |
754 | if (neigh_seq_diff < BATADV_OGM_MAX_ORIGDIFF && |
755 | router_throughput >= neigh_throughput) | |
86de37c1 SW |
756 | goto out; |
757 | } | |
758 | ||
759 | batadv_update_route(bat_priv, orig_node, if_outgoing, neigh_node); | |
9323158e | 760 | out: |
79a0bffb SE |
761 | batadv_neigh_node_put(router); |
762 | batadv_neigh_node_put(orig_neigh_router); | |
763 | batadv_orig_node_put(orig_neigh_node); | |
764 | batadv_neigh_ifinfo_put(router_ifinfo); | |
765 | batadv_neigh_ifinfo_put(neigh_ifinfo); | |
efcc9d30 SW |
766 | |
767 | return forward; | |
9323158e AQ |
768 | } |
769 | ||
770 | /** | |
7e9a8c2c | 771 | * batadv_v_ogm_process_per_outif() - process a batman v OGM for an outgoing if |
9323158e AQ |
772 | * @bat_priv: the bat priv with all the soft interface information |
773 | * @ethhdr: the Ethernet header of the OGM2 | |
774 | * @ogm2: OGM2 structure | |
775 | * @orig_node: Originator structure for which the OGM has been received | |
776 | * @neigh_node: the neigh_node through with the OGM has been received | |
777 | * @if_incoming: the interface where this packet was received | |
778 | * @if_outgoing: the interface for which the packet should be considered | |
779 | */ | |
780 | static void | |
781 | batadv_v_ogm_process_per_outif(struct batadv_priv *bat_priv, | |
782 | const struct ethhdr *ethhdr, | |
783 | const struct batadv_ogm2_packet *ogm2, | |
784 | struct batadv_orig_node *orig_node, | |
785 | struct batadv_neigh_node *neigh_node, | |
786 | struct batadv_hard_iface *if_incoming, | |
787 | struct batadv_hard_iface *if_outgoing) | |
788 | { | |
789 | int seqno_age; | |
efcc9d30 | 790 | bool forward; |
9323158e AQ |
791 | |
792 | /* first, update the metric with according sanity checks */ | |
793 | seqno_age = batadv_v_ogm_metric_update(bat_priv, ogm2, orig_node, | |
794 | neigh_node, if_incoming, | |
795 | if_outgoing); | |
796 | ||
797 | /* outdated sequence numbers are to be discarded */ | |
798 | if (seqno_age < 0) | |
799 | return; | |
800 | ||
801 | /* only unknown & newer OGMs contain TVLVs we are interested in */ | |
825ffe1f | 802 | if (seqno_age > 0 && if_outgoing == BATADV_IF_DEFAULT) |
9323158e AQ |
803 | batadv_tvlv_containers_process(bat_priv, true, orig_node, |
804 | NULL, NULL, | |
805 | (unsigned char *)(ogm2 + 1), | |
806 | ntohs(ogm2->tvlv_len)); | |
807 | ||
808 | /* if the metric update went through, update routes if needed */ | |
efcc9d30 SW |
809 | forward = batadv_v_ogm_route_update(bat_priv, ethhdr, ogm2, orig_node, |
810 | neigh_node, if_incoming, | |
811 | if_outgoing); | |
812 | ||
813 | /* if the routes have been processed correctly, check and forward */ | |
814 | if (forward) | |
815 | batadv_v_ogm_forward(bat_priv, ogm2, orig_node, neigh_node, | |
816 | if_incoming, if_outgoing); | |
9323158e AQ |
817 | } |
818 | ||
819 | /** | |
7e9a8c2c | 820 | * batadv_v_ogm_aggr_packet() - checks if there is another OGM aggregated |
9323158e AQ |
821 | * @buff_pos: current position in the skb |
822 | * @packet_len: total length of the skb | |
0ff0f15a | 823 | * @ogm2_packet: potential OGM2 in buffer |
9323158e AQ |
824 | * |
825 | * Return: true if there is enough space for another OGM, false otherwise. | |
826 | */ | |
0ff0f15a SE |
827 | static bool |
828 | batadv_v_ogm_aggr_packet(int buff_pos, int packet_len, | |
829 | const struct batadv_ogm2_packet *ogm2_packet) | |
9323158e AQ |
830 | { |
831 | int next_buff_pos = 0; | |
832 | ||
0ff0f15a SE |
833 | /* check if there is enough space for the header */ |
834 | next_buff_pos += buff_pos + sizeof(*ogm2_packet); | |
835 | if (next_buff_pos > packet_len) | |
836 | return false; | |
837 | ||
838 | /* check if there is enough space for the optional TVLV */ | |
839 | next_buff_pos += ntohs(ogm2_packet->tvlv_len); | |
9323158e AQ |
840 | |
841 | return (next_buff_pos <= packet_len) && | |
842 | (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES); | |
843 | } | |
844 | ||
845 | /** | |
7e9a8c2c | 846 | * batadv_v_ogm_process() - process an incoming batman v OGM |
9323158e AQ |
847 | * @skb: the skb containing the OGM |
848 | * @ogm_offset: offset to the OGM which should be processed (for aggregates) | |
bccb48c8 | 849 | * @if_incoming: the interface where this packet was received |
9323158e AQ |
850 | */ |
851 | static void batadv_v_ogm_process(const struct sk_buff *skb, int ogm_offset, | |
852 | struct batadv_hard_iface *if_incoming) | |
853 | { | |
854 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); | |
855 | struct ethhdr *ethhdr; | |
856 | struct batadv_orig_node *orig_node = NULL; | |
857 | struct batadv_hardif_neigh_node *hardif_neigh = NULL; | |
858 | struct batadv_neigh_node *neigh_node = NULL; | |
859 | struct batadv_hard_iface *hard_iface; | |
860 | struct batadv_ogm2_packet *ogm_packet; | |
861 | u32 ogm_throughput, link_throughput, path_throughput; | |
3111beed | 862 | int ret; |
9323158e AQ |
863 | |
864 | ethhdr = eth_hdr(skb); | |
865 | ogm_packet = (struct batadv_ogm2_packet *)(skb->data + ogm_offset); | |
866 | ||
867 | ogm_throughput = ntohl(ogm_packet->throughput); | |
868 | ||
869 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
f25cbb2a | 870 | "Received OGM2 packet via NB: %pM, IF: %s [%pM] (from OG: %pM, seqno %u, throughput %u, TTL %u, V %u, tvlv_len %u)\n", |
9323158e AQ |
871 | ethhdr->h_source, if_incoming->net_dev->name, |
872 | if_incoming->net_dev->dev_addr, ogm_packet->orig, | |
873 | ntohl(ogm_packet->seqno), ogm_throughput, ogm_packet->ttl, | |
874 | ogm_packet->version, ntohs(ogm_packet->tvlv_len)); | |
875 | ||
d8bf0c01 LL |
876 | if (batadv_is_my_mac(bat_priv, ogm_packet->orig)) { |
877 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
878 | "Drop packet: originator packet from ourself\n"); | |
879 | return; | |
880 | } | |
881 | ||
f25cbb2a CIK |
882 | /* If the throughput metric is 0, immediately drop the packet. No need |
883 | * to create orig_node / neigh_node for an unusable route. | |
9323158e AQ |
884 | */ |
885 | if (ogm_throughput == 0) { | |
886 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
f25cbb2a | 887 | "Drop packet: originator packet with throughput metric of 0\n"); |
9323158e AQ |
888 | return; |
889 | } | |
890 | ||
891 | /* require ELP packets be to received from this neighbor first */ | |
892 | hardif_neigh = batadv_hardif_neigh_get(if_incoming, ethhdr->h_source); | |
893 | if (!hardif_neigh) { | |
894 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
895 | "Drop packet: OGM via unknown neighbor!\n"); | |
896 | goto out; | |
897 | } | |
898 | ||
899 | orig_node = batadv_v_ogm_orig_get(bat_priv, ogm_packet->orig); | |
900 | if (!orig_node) | |
6f91a3f7 | 901 | goto out; |
9323158e | 902 | |
6f0a6b5e ML |
903 | neigh_node = batadv_neigh_node_get_or_create(orig_node, if_incoming, |
904 | ethhdr->h_source); | |
9323158e AQ |
905 | if (!neigh_node) |
906 | goto out; | |
907 | ||
908 | /* Update the received throughput metric to match the link | |
909 | * characteristic: | |
910 | * - If this OGM traveled one hop so far (emitted by single hop | |
911 | * neighbor) the path throughput metric equals the link throughput. | |
912 | * - For OGMs traversing more than hop the path throughput metric is | |
913 | * the smaller of the path throughput and the link throughput. | |
914 | */ | |
915 | link_throughput = ewma_throughput_read(&hardif_neigh->bat_v.throughput); | |
916 | path_throughput = min_t(u32, link_throughput, ogm_throughput); | |
917 | ogm_packet->throughput = htonl(path_throughput); | |
918 | ||
919 | batadv_v_ogm_process_per_outif(bat_priv, ethhdr, ogm_packet, orig_node, | |
920 | neigh_node, if_incoming, | |
921 | BATADV_IF_DEFAULT); | |
922 | ||
923 | rcu_read_lock(); | |
924 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { | |
925 | if (hard_iface->if_status != BATADV_IF_ACTIVE) | |
926 | continue; | |
927 | ||
928 | if (hard_iface->soft_iface != bat_priv->soft_iface) | |
929 | continue; | |
930 | ||
27353446 SE |
931 | if (!kref_get_unless_zero(&hard_iface->refcount)) |
932 | continue; | |
933 | ||
3111beed LL |
934 | ret = batadv_hardif_no_broadcast(hard_iface, |
935 | ogm_packet->orig, | |
936 | hardif_neigh->orig); | |
937 | ||
938 | if (ret) { | |
939 | char *type; | |
940 | ||
941 | switch (ret) { | |
942 | case BATADV_HARDIF_BCAST_NORECIPIENT: | |
943 | type = "no neighbor"; | |
944 | break; | |
945 | case BATADV_HARDIF_BCAST_DUPFWD: | |
946 | type = "single neighbor is source"; | |
947 | break; | |
948 | case BATADV_HARDIF_BCAST_DUPORIG: | |
949 | type = "single neighbor is originator"; | |
950 | break; | |
951 | default: | |
952 | type = "unknown"; | |
953 | } | |
954 | ||
f25cbb2a | 955 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "OGM2 packet from %pM on %s suppressed: %s\n", |
3111beed LL |
956 | ogm_packet->orig, hard_iface->net_dev->name, |
957 | type); | |
958 | ||
959 | batadv_hardif_put(hard_iface); | |
960 | continue; | |
961 | } | |
962 | ||
9323158e AQ |
963 | batadv_v_ogm_process_per_outif(bat_priv, ethhdr, ogm_packet, |
964 | orig_node, neigh_node, | |
965 | if_incoming, hard_iface); | |
27353446 SE |
966 | |
967 | batadv_hardif_put(hard_iface); | |
9323158e AQ |
968 | } |
969 | rcu_read_unlock(); | |
970 | out: | |
79a0bffb SE |
971 | batadv_orig_node_put(orig_node); |
972 | batadv_neigh_node_put(neigh_node); | |
973 | batadv_hardif_neigh_put(hardif_neigh); | |
9323158e AQ |
974 | } |
975 | ||
0da00359 | 976 | /** |
7e9a8c2c | 977 | * batadv_v_ogm_packet_recv() - OGM2 receiving handler |
0da00359 AQ |
978 | * @skb: the received OGM |
979 | * @if_incoming: the interface where this OGM has been received | |
980 | * | |
981 | * Return: NET_RX_SUCCESS and consume the skb on success or returns NET_RX_DROP | |
982 | * (without freeing the skb) on failure | |
983 | */ | |
984 | int batadv_v_ogm_packet_recv(struct sk_buff *skb, | |
985 | struct batadv_hard_iface *if_incoming) | |
986 | { | |
987 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); | |
988 | struct batadv_ogm2_packet *ogm_packet; | |
989 | struct ethhdr *ethhdr = eth_hdr(skb); | |
9323158e AQ |
990 | int ogm_offset; |
991 | u8 *packet_pos; | |
992 | int ret = NET_RX_DROP; | |
0da00359 AQ |
993 | |
994 | /* did we receive a OGM2 packet on an interface that does not have | |
995 | * B.A.T.M.A.N. V enabled ? | |
996 | */ | |
29824a55 | 997 | if (strcmp(bat_priv->algo_ops->name, "BATMAN_V") != 0) |
b91a2543 | 998 | goto free_skb; |
0da00359 AQ |
999 | |
1000 | if (!batadv_check_management_packet(skb, if_incoming, BATADV_OGM2_HLEN)) | |
b91a2543 | 1001 | goto free_skb; |
0da00359 AQ |
1002 | |
1003 | if (batadv_is_my_mac(bat_priv, ethhdr->h_source)) | |
b91a2543 | 1004 | goto free_skb; |
0da00359 | 1005 | |
0da00359 AQ |
1006 | batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX); |
1007 | batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES, | |
1008 | skb->len + ETH_HLEN); | |
1009 | ||
9323158e AQ |
1010 | ogm_offset = 0; |
1011 | ogm_packet = (struct batadv_ogm2_packet *)skb->data; | |
1012 | ||
1013 | while (batadv_v_ogm_aggr_packet(ogm_offset, skb_headlen(skb), | |
0ff0f15a | 1014 | ogm_packet)) { |
9323158e AQ |
1015 | batadv_v_ogm_process(skb, ogm_offset, if_incoming); |
1016 | ||
1017 | ogm_offset += BATADV_OGM2_HLEN; | |
1018 | ogm_offset += ntohs(ogm_packet->tvlv_len); | |
1019 | ||
1020 | packet_pos = skb->data + ogm_offset; | |
1021 | ogm_packet = (struct batadv_ogm2_packet *)packet_pos; | |
1022 | } | |
1023 | ||
1024 | ret = NET_RX_SUCCESS; | |
b91a2543 SE |
1025 | |
1026 | free_skb: | |
1027 | if (ret == NET_RX_SUCCESS) | |
1028 | consume_skb(skb); | |
1029 | else | |
1030 | kfree_skb(skb); | |
9323158e AQ |
1031 | |
1032 | return ret; | |
0da00359 AQ |
1033 | } |
1034 | ||
1035 | /** | |
7e9a8c2c | 1036 | * batadv_v_ogm_init() - initialise the OGM2 engine |
0da00359 AQ |
1037 | * @bat_priv: the bat priv with all the soft interface information |
1038 | * | |
1039 | * Return: 0 on success or a negative error code in case of failure | |
1040 | */ | |
1041 | int batadv_v_ogm_init(struct batadv_priv *bat_priv) | |
1042 | { | |
1043 | struct batadv_ogm2_packet *ogm_packet; | |
1044 | unsigned char *ogm_buff; | |
1045 | u32 random_seqno; | |
1046 | ||
1047 | bat_priv->bat_v.ogm_buff_len = BATADV_OGM2_HLEN; | |
1048 | ogm_buff = kzalloc(bat_priv->bat_v.ogm_buff_len, GFP_ATOMIC); | |
1049 | if (!ogm_buff) | |
1050 | return -ENOMEM; | |
1051 | ||
1052 | bat_priv->bat_v.ogm_buff = ogm_buff; | |
1053 | ogm_packet = (struct batadv_ogm2_packet *)ogm_buff; | |
1054 | ogm_packet->packet_type = BATADV_OGM2; | |
1055 | ogm_packet->version = BATADV_COMPAT_VERSION; | |
1056 | ogm_packet->ttl = BATADV_TTL; | |
1057 | ogm_packet->flags = BATADV_NO_FLAGS; | |
1058 | ogm_packet->throughput = htonl(BATADV_THROUGHPUT_MAX_VALUE); | |
1059 | ||
1060 | /* randomize initial seqno to avoid collision */ | |
1061 | get_random_bytes(&random_seqno, sizeof(random_seqno)); | |
1062 | atomic_set(&bat_priv->bat_v.ogm_seqno, random_seqno); | |
1063 | INIT_DELAYED_WORK(&bat_priv->bat_v.ogm_wq, batadv_v_ogm_send); | |
1064 | ||
a8d23cbb SE |
1065 | mutex_init(&bat_priv->bat_v.ogm_buff_mutex); |
1066 | ||
0da00359 AQ |
1067 | return 0; |
1068 | } | |
1069 | ||
1070 | /** | |
7e9a8c2c | 1071 | * batadv_v_ogm_free() - free OGM private resources |
0da00359 AQ |
1072 | * @bat_priv: the bat priv with all the soft interface information |
1073 | */ | |
1074 | void batadv_v_ogm_free(struct batadv_priv *bat_priv) | |
1075 | { | |
1076 | cancel_delayed_work_sync(&bat_priv->bat_v.ogm_wq); | |
1077 | ||
a8d23cbb SE |
1078 | mutex_lock(&bat_priv->bat_v.ogm_buff_mutex); |
1079 | ||
0da00359 AQ |
1080 | kfree(bat_priv->bat_v.ogm_buff); |
1081 | bat_priv->bat_v.ogm_buff = NULL; | |
1082 | bat_priv->bat_v.ogm_buff_len = 0; | |
a8d23cbb SE |
1083 | |
1084 | mutex_unlock(&bat_priv->bat_v.ogm_buff_mutex); | |
0da00359 | 1085 | } |