Commit | Line | Data |
---|---|---|
7db7d9f3 | 1 | // SPDX-License-Identifier: GPL-2.0 |
7a79d717 | 2 | /* Copyright (C) 2013-2019 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> |
0da00359 AQ |
21 | #include <linux/netdevice.h> |
22 | #include <linux/random.h> | |
23 | #include <linux/rculist.h> | |
24 | #include <linux/rcupdate.h> | |
25 | #include <linux/skbuff.h> | |
26 | #include <linux/slab.h> | |
f89255a0 | 27 | #include <linux/spinlock.h> |
0da00359 AQ |
28 | #include <linux/stddef.h> |
29 | #include <linux/string.h> | |
30 | #include <linux/types.h> | |
31 | #include <linux/workqueue.h> | |
fec149f5 | 32 | #include <uapi/linux/batadv_packet.h> |
0da00359 | 33 | |
01d350d1 | 34 | #include "bat_algo.h" |
0da00359 | 35 | #include "hard-interface.h" |
9323158e | 36 | #include "hash.h" |
ba412080 | 37 | #include "log.h" |
9323158e | 38 | #include "originator.h" |
0da00359 AQ |
39 | #include "routing.h" |
40 | #include "send.h" | |
41 | #include "translation-table.h" | |
1f8dce49 | 42 | #include "tvlv.h" |
0da00359 | 43 | |
9323158e | 44 | /** |
7e9a8c2c | 45 | * batadv_v_ogm_orig_get() - retrieve and possibly create an originator node |
9323158e AQ |
46 | * @bat_priv: the bat priv with all the soft interface information |
47 | * @addr: the address of the originator | |
48 | * | |
49 | * Return: the orig_node corresponding to the specified address. If such object | |
50 | * does not exist it is allocated here. In case of allocation failure returns | |
51 | * NULL. | |
52 | */ | |
53 | struct batadv_orig_node *batadv_v_ogm_orig_get(struct batadv_priv *bat_priv, | |
54 | const u8 *addr) | |
55 | { | |
56 | struct batadv_orig_node *orig_node; | |
57 | int hash_added; | |
58 | ||
59 | orig_node = batadv_orig_hash_find(bat_priv, addr); | |
60 | if (orig_node) | |
61 | return orig_node; | |
62 | ||
63 | orig_node = batadv_orig_node_new(bat_priv, addr); | |
64 | if (!orig_node) | |
65 | return NULL; | |
66 | ||
55db2d59 | 67 | kref_get(&orig_node->refcount); |
9323158e AQ |
68 | hash_added = batadv_hash_add(bat_priv->orig_hash, batadv_compare_orig, |
69 | batadv_choose_orig, orig_node, | |
70 | &orig_node->hash_entry); | |
71 | if (hash_added != 0) { | |
55db2d59 | 72 | /* remove refcnt for newly created orig_node and hash entry */ |
9323158e AQ |
73 | batadv_orig_node_put(orig_node); |
74 | batadv_orig_node_put(orig_node); | |
75 | orig_node = NULL; | |
76 | } | |
77 | ||
78 | return orig_node; | |
79 | } | |
80 | ||
f89255a0 LL |
81 | /** |
82 | * batadv_v_ogm_start_queue_timer() - restart the OGM aggregation timer | |
83 | * @hard_iface: the interface to use to send the OGM | |
84 | */ | |
85 | static void batadv_v_ogm_start_queue_timer(struct batadv_hard_iface *hard_iface) | |
86 | { | |
87 | unsigned int msecs = BATADV_MAX_AGGREGATION_MS * 1000; | |
88 | ||
89 | /* msecs * [0.9, 1.1] */ | |
90 | msecs += prandom_u32() % (msecs / 5) - (msecs / 10); | |
91 | queue_delayed_work(batadv_event_workqueue, &hard_iface->bat_v.aggr_wq, | |
92 | msecs_to_jiffies(msecs / 1000)); | |
93 | } | |
94 | ||
0da00359 | 95 | /** |
7e9a8c2c | 96 | * batadv_v_ogm_start_timer() - restart the OGM sending timer |
0da00359 AQ |
97 | * @bat_priv: the bat priv with all the soft interface information |
98 | */ | |
99 | static void batadv_v_ogm_start_timer(struct batadv_priv *bat_priv) | |
100 | { | |
101 | unsigned long msecs; | |
102 | /* this function may be invoked in different contexts (ogm rescheduling | |
103 | * or hard_iface activation), but the work timer should not be reset | |
104 | */ | |
105 | if (delayed_work_pending(&bat_priv->bat_v.ogm_wq)) | |
106 | return; | |
107 | ||
108 | msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER; | |
109 | msecs += prandom_u32() % (2 * BATADV_JITTER); | |
110 | queue_delayed_work(batadv_event_workqueue, &bat_priv->bat_v.ogm_wq, | |
111 | msecs_to_jiffies(msecs)); | |
112 | } | |
113 | ||
114 | /** | |
7e9a8c2c | 115 | * batadv_v_ogm_send_to_if() - send a batman ogm using a given interface |
0da00359 AQ |
116 | * @skb: the OGM to send |
117 | * @hard_iface: the interface to use to send the OGM | |
118 | */ | |
119 | static void batadv_v_ogm_send_to_if(struct sk_buff *skb, | |
120 | struct batadv_hard_iface *hard_iface) | |
121 | { | |
122 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); | |
123 | ||
124 | if (hard_iface->if_status != BATADV_IF_ACTIVE) | |
125 | return; | |
126 | ||
127 | batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX); | |
128 | batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES, | |
129 | skb->len + ETH_HLEN); | |
130 | ||
95d39278 | 131 | batadv_send_broadcast_skb(skb, hard_iface); |
0da00359 AQ |
132 | } |
133 | ||
f89255a0 LL |
134 | /** |
135 | * batadv_v_ogm_len() - OGMv2 packet length | |
136 | * @skb: the OGM to check | |
137 | * | |
138 | * Return: Length of the given OGMv2 packet, including tvlv length, excluding | |
139 | * ethernet header length. | |
140 | */ | |
141 | static unsigned int batadv_v_ogm_len(struct sk_buff *skb) | |
142 | { | |
143 | struct batadv_ogm2_packet *ogm_packet; | |
144 | ||
145 | ogm_packet = (struct batadv_ogm2_packet *)skb->data; | |
146 | return BATADV_OGM2_HLEN + ntohs(ogm_packet->tvlv_len); | |
147 | } | |
148 | ||
149 | /** | |
150 | * batadv_v_ogm_queue_left() - check if given OGM still fits aggregation queue | |
151 | * @skb: the OGM to check | |
152 | * @hard_iface: the interface to use to send the OGM | |
153 | * | |
154 | * Caller needs to hold the hard_iface->bat_v.aggr_list_lock. | |
155 | * | |
156 | * Return: True, if the given OGMv2 packet still fits, false otherwise. | |
157 | */ | |
158 | static bool batadv_v_ogm_queue_left(struct sk_buff *skb, | |
159 | struct batadv_hard_iface *hard_iface) | |
160 | { | |
161 | unsigned int max = min_t(unsigned int, hard_iface->net_dev->mtu, | |
162 | BATADV_MAX_AGGREGATION_BYTES); | |
163 | unsigned int ogm_len = batadv_v_ogm_len(skb); | |
164 | ||
165 | lockdep_assert_held(&hard_iface->bat_v.aggr_list_lock); | |
166 | ||
167 | return hard_iface->bat_v.aggr_len + ogm_len <= max; | |
168 | } | |
169 | ||
170 | /** | |
171 | * batadv_v_ogm_aggr_list_free - free all elements in an aggregation queue | |
172 | * @hard_iface: the interface holding the aggregation queue | |
173 | * | |
174 | * Empties the OGMv2 aggregation queue and frees all the skbs it contained. | |
175 | * | |
176 | * Caller needs to hold the hard_iface->bat_v.aggr_list_lock. | |
177 | */ | |
178 | static void batadv_v_ogm_aggr_list_free(struct batadv_hard_iface *hard_iface) | |
179 | { | |
180 | struct sk_buff *skb; | |
181 | ||
182 | lockdep_assert_held(&hard_iface->bat_v.aggr_list_lock); | |
183 | ||
184 | while ((skb = skb_dequeue(&hard_iface->bat_v.aggr_list))) | |
185 | kfree_skb(skb); | |
186 | ||
187 | hard_iface->bat_v.aggr_len = 0; | |
188 | } | |
189 | ||
190 | /** | |
191 | * batadv_v_ogm_aggr_send() - flush & send aggregation queue | |
192 | * @hard_iface: the interface with the aggregation queue to flush | |
193 | * | |
9cb9a178 LL |
194 | * Aggregates all OGMv2 packets currently in the aggregation queue into a |
195 | * single OGMv2 packet and transmits this aggregate. | |
196 | * | |
197 | * The aggregation queue is empty after this call. | |
198 | * | |
f89255a0 LL |
199 | * Caller needs to hold the hard_iface->bat_v.aggr_list_lock. |
200 | */ | |
201 | static void batadv_v_ogm_aggr_send(struct batadv_hard_iface *hard_iface) | |
202 | { | |
9cb9a178 LL |
203 | unsigned int aggr_len = hard_iface->bat_v.aggr_len; |
204 | struct sk_buff *skb_aggr; | |
205 | unsigned int ogm_len; | |
f89255a0 LL |
206 | struct sk_buff *skb; |
207 | ||
208 | lockdep_assert_held(&hard_iface->bat_v.aggr_list_lock); | |
209 | ||
9cb9a178 LL |
210 | if (!aggr_len) |
211 | return; | |
212 | ||
213 | skb_aggr = dev_alloc_skb(aggr_len + ETH_HLEN + NET_IP_ALIGN); | |
214 | if (!skb_aggr) { | |
215 | batadv_v_ogm_aggr_list_free(hard_iface); | |
216 | return; | |
217 | } | |
218 | ||
219 | skb_reserve(skb_aggr, ETH_HLEN + NET_IP_ALIGN); | |
220 | skb_reset_network_header(skb_aggr); | |
221 | ||
f89255a0 LL |
222 | while ((skb = skb_dequeue(&hard_iface->bat_v.aggr_list))) { |
223 | hard_iface->bat_v.aggr_len -= batadv_v_ogm_len(skb); | |
9cb9a178 LL |
224 | |
225 | ogm_len = batadv_v_ogm_len(skb); | |
226 | skb_put_data(skb_aggr, skb->data, ogm_len); | |
227 | ||
228 | consume_skb(skb); | |
f89255a0 | 229 | } |
9cb9a178 LL |
230 | |
231 | batadv_v_ogm_send_to_if(skb_aggr, hard_iface); | |
f89255a0 LL |
232 | } |
233 | ||
234 | /** | |
235 | * batadv_v_ogm_queue_on_if() - queue a batman ogm on a given interface | |
236 | * @skb: the OGM to queue | |
237 | * @hard_iface: the interface to queue the OGM on | |
238 | */ | |
239 | static void batadv_v_ogm_queue_on_if(struct sk_buff *skb, | |
240 | struct batadv_hard_iface *hard_iface) | |
241 | { | |
242 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); | |
243 | ||
244 | if (!atomic_read(&bat_priv->aggregated_ogms)) { | |
245 | batadv_v_ogm_send_to_if(skb, hard_iface); | |
246 | return; | |
247 | } | |
248 | ||
249 | spin_lock_bh(&hard_iface->bat_v.aggr_list_lock); | |
250 | if (!batadv_v_ogm_queue_left(skb, hard_iface)) | |
251 | batadv_v_ogm_aggr_send(hard_iface); | |
252 | ||
253 | hard_iface->bat_v.aggr_len += batadv_v_ogm_len(skb); | |
254 | skb_queue_tail(&hard_iface->bat_v.aggr_list, skb); | |
255 | spin_unlock_bh(&hard_iface->bat_v.aggr_list_lock); | |
256 | } | |
257 | ||
0da00359 | 258 | /** |
7e9a8c2c | 259 | * batadv_v_ogm_send() - periodic worker broadcasting the own OGM |
0da00359 AQ |
260 | * @work: work queue item |
261 | */ | |
262 | static void batadv_v_ogm_send(struct work_struct *work) | |
263 | { | |
264 | struct batadv_hard_iface *hard_iface; | |
265 | struct batadv_priv_bat_v *bat_v; | |
266 | struct batadv_priv *bat_priv; | |
267 | struct batadv_ogm2_packet *ogm_packet; | |
268 | struct sk_buff *skb, *skb_tmp; | |
e04de486 | 269 | unsigned char *ogm_buff; |
0da00359 AQ |
270 | int ogm_buff_len; |
271 | u16 tvlv_len = 0; | |
3111beed | 272 | int ret; |
0da00359 AQ |
273 | |
274 | bat_v = container_of(work, struct batadv_priv_bat_v, ogm_wq.work); | |
275 | bat_priv = container_of(bat_v, struct batadv_priv, bat_v); | |
276 | ||
277 | if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING) | |
278 | goto out; | |
279 | ||
280 | ogm_buff = bat_priv->bat_v.ogm_buff; | |
281 | ogm_buff_len = bat_priv->bat_v.ogm_buff_len; | |
282 | /* tt changes have to be committed before the tvlv data is | |
283 | * appended as it may alter the tt tvlv container | |
284 | */ | |
285 | batadv_tt_local_commit_changes(bat_priv); | |
286 | tvlv_len = batadv_tvlv_container_ogm_append(bat_priv, &ogm_buff, | |
287 | &ogm_buff_len, | |
288 | BATADV_OGM2_HLEN); | |
289 | ||
290 | bat_priv->bat_v.ogm_buff = ogm_buff; | |
291 | bat_priv->bat_v.ogm_buff_len = ogm_buff_len; | |
292 | ||
293 | skb = netdev_alloc_skb_ip_align(NULL, ETH_HLEN + ogm_buff_len); | |
294 | if (!skb) | |
295 | goto reschedule; | |
296 | ||
297 | skb_reserve(skb, ETH_HLEN); | |
e04de486 | 298 | skb_put_data(skb, ogm_buff, ogm_buff_len); |
0da00359 AQ |
299 | |
300 | ogm_packet = (struct batadv_ogm2_packet *)skb->data; | |
301 | ogm_packet->seqno = htonl(atomic_read(&bat_priv->bat_v.ogm_seqno)); | |
302 | atomic_inc(&bat_priv->bat_v.ogm_seqno); | |
303 | ogm_packet->tvlv_len = htons(tvlv_len); | |
304 | ||
305 | /* broadcast on every interface */ | |
306 | rcu_read_lock(); | |
307 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { | |
308 | if (hard_iface->soft_iface != bat_priv->soft_iface) | |
309 | continue; | |
310 | ||
27353446 SE |
311 | if (!kref_get_unless_zero(&hard_iface->refcount)) |
312 | continue; | |
313 | ||
3111beed LL |
314 | ret = batadv_hardif_no_broadcast(hard_iface, NULL, NULL); |
315 | if (ret) { | |
316 | char *type; | |
317 | ||
318 | switch (ret) { | |
319 | case BATADV_HARDIF_BCAST_NORECIPIENT: | |
320 | type = "no neighbor"; | |
321 | break; | |
322 | case BATADV_HARDIF_BCAST_DUPFWD: | |
323 | type = "single neighbor is source"; | |
324 | break; | |
325 | case BATADV_HARDIF_BCAST_DUPORIG: | |
326 | type = "single neighbor is originator"; | |
327 | break; | |
328 | default: | |
329 | type = "unknown"; | |
330 | } | |
331 | ||
f25cbb2a | 332 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "OGM2 from ourselves on %s suppressed: %s\n", |
3111beed LL |
333 | hard_iface->net_dev->name, type); |
334 | ||
335 | batadv_hardif_put(hard_iface); | |
336 | continue; | |
337 | } | |
338 | ||
0da00359 AQ |
339 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
340 | "Sending own OGM2 packet (originator %pM, seqno %u, throughput %u, TTL %d) on interface %s [%pM]\n", | |
341 | ogm_packet->orig, ntohl(ogm_packet->seqno), | |
342 | ntohl(ogm_packet->throughput), ogm_packet->ttl, | |
343 | hard_iface->net_dev->name, | |
344 | hard_iface->net_dev->dev_addr); | |
345 | ||
346 | /* this skb gets consumed by batadv_v_ogm_send_to_if() */ | |
347 | skb_tmp = skb_clone(skb, GFP_ATOMIC); | |
27353446 SE |
348 | if (!skb_tmp) { |
349 | batadv_hardif_put(hard_iface); | |
0da00359 | 350 | break; |
27353446 | 351 | } |
0da00359 | 352 | |
f89255a0 | 353 | batadv_v_ogm_queue_on_if(skb_tmp, hard_iface); |
27353446 | 354 | batadv_hardif_put(hard_iface); |
0da00359 AQ |
355 | } |
356 | rcu_read_unlock(); | |
357 | ||
358 | consume_skb(skb); | |
359 | ||
360 | reschedule: | |
361 | batadv_v_ogm_start_timer(bat_priv); | |
362 | out: | |
363 | return; | |
364 | } | |
365 | ||
f89255a0 LL |
366 | /** |
367 | * batadv_v_ogm_aggr_work() - OGM queue periodic task per interface | |
368 | * @work: work queue item | |
369 | * | |
370 | * Emits aggregated OGM message in regular intervals. | |
371 | */ | |
372 | void batadv_v_ogm_aggr_work(struct work_struct *work) | |
373 | { | |
374 | struct batadv_hard_iface_bat_v *batv; | |
375 | struct batadv_hard_iface *hard_iface; | |
376 | ||
377 | batv = container_of(work, struct batadv_hard_iface_bat_v, aggr_wq.work); | |
378 | hard_iface = container_of(batv, struct batadv_hard_iface, bat_v); | |
379 | ||
380 | spin_lock_bh(&hard_iface->bat_v.aggr_list_lock); | |
381 | batadv_v_ogm_aggr_send(hard_iface); | |
382 | spin_unlock_bh(&hard_iface->bat_v.aggr_list_lock); | |
383 | ||
384 | batadv_v_ogm_start_queue_timer(hard_iface); | |
385 | } | |
386 | ||
0da00359 | 387 | /** |
7e9a8c2c | 388 | * batadv_v_ogm_iface_enable() - prepare an interface for B.A.T.M.A.N. V |
0da00359 AQ |
389 | * @hard_iface: the interface to prepare |
390 | * | |
391 | * Takes care of scheduling own OGM sending routine for this interface. | |
392 | * | |
393 | * Return: 0 on success or a negative error code otherwise | |
394 | */ | |
395 | int batadv_v_ogm_iface_enable(struct batadv_hard_iface *hard_iface) | |
396 | { | |
397 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); | |
398 | ||
f89255a0 | 399 | batadv_v_ogm_start_queue_timer(hard_iface); |
0da00359 AQ |
400 | batadv_v_ogm_start_timer(bat_priv); |
401 | ||
402 | return 0; | |
403 | } | |
404 | ||
f89255a0 LL |
405 | /** |
406 | * batadv_v_ogm_iface_disable() - release OGM interface private resources | |
407 | * @hard_iface: interface for which the resources have to be released | |
408 | */ | |
409 | void batadv_v_ogm_iface_disable(struct batadv_hard_iface *hard_iface) | |
410 | { | |
411 | cancel_delayed_work_sync(&hard_iface->bat_v.aggr_wq); | |
412 | ||
413 | spin_lock_bh(&hard_iface->bat_v.aggr_list_lock); | |
414 | batadv_v_ogm_aggr_list_free(hard_iface); | |
415 | spin_unlock_bh(&hard_iface->bat_v.aggr_list_lock); | |
416 | } | |
417 | ||
0da00359 | 418 | /** |
7e9a8c2c | 419 | * batadv_v_ogm_primary_iface_set() - set a new primary interface |
0da00359 AQ |
420 | * @primary_iface: the new primary interface |
421 | */ | |
422 | void batadv_v_ogm_primary_iface_set(struct batadv_hard_iface *primary_iface) | |
423 | { | |
424 | struct batadv_priv *bat_priv = netdev_priv(primary_iface->soft_iface); | |
425 | struct batadv_ogm2_packet *ogm_packet; | |
426 | ||
427 | if (!bat_priv->bat_v.ogm_buff) | |
428 | return; | |
429 | ||
430 | ogm_packet = (struct batadv_ogm2_packet *)bat_priv->bat_v.ogm_buff; | |
431 | ether_addr_copy(ogm_packet->orig, primary_iface->net_dev->dev_addr); | |
432 | } | |
433 | ||
9323158e | 434 | /** |
7e9a8c2c SE |
435 | * batadv_v_forward_penalty() - apply a penalty to the throughput metric |
436 | * forwarded with B.A.T.M.A.N. V OGMs | |
9323158e AQ |
437 | * @bat_priv: the bat priv with all the soft interface information |
438 | * @if_incoming: the interface where the OGM has been received | |
439 | * @if_outgoing: the interface where the OGM has to be forwarded to | |
440 | * @throughput: the current throughput | |
441 | * | |
442 | * Apply a penalty on the current throughput metric value based on the | |
443 | * characteristic of the interface where the OGM has been received. The return | |
444 | * value is computed as follows: | |
445 | * - throughput * 50% if the incoming and outgoing interface are the | |
446 | * same WiFi interface and the throughput is above | |
447 | * 1MBit/s | |
448 | * - throughput if the outgoing interface is the default | |
449 | * interface (i.e. this OGM is processed for the | |
450 | * internal table and not forwarded) | |
451 | * - throughput * hop penalty otherwise | |
452 | * | |
453 | * Return: the penalised throughput metric. | |
454 | */ | |
455 | static u32 batadv_v_forward_penalty(struct batadv_priv *bat_priv, | |
456 | struct batadv_hard_iface *if_incoming, | |
457 | struct batadv_hard_iface *if_outgoing, | |
458 | u32 throughput) | |
459 | { | |
460 | int hop_penalty = atomic_read(&bat_priv->hop_penalty); | |
461 | int hop_penalty_max = BATADV_TQ_MAX_VALUE; | |
462 | ||
463 | /* Don't apply hop penalty in default originator table. */ | |
464 | if (if_outgoing == BATADV_IF_DEFAULT) | |
465 | return throughput; | |
466 | ||
467 | /* Forwarding on the same WiFi interface cuts the throughput in half | |
468 | * due to the store & forward characteristics of WIFI. | |
469 | * Very low throughput values are the exception. | |
470 | */ | |
825ffe1f SE |
471 | if (throughput > 10 && |
472 | if_incoming == if_outgoing && | |
c833484e | 473 | !(if_incoming->bat_v.flags & BATADV_FULL_DUPLEX)) |
9323158e AQ |
474 | return throughput / 2; |
475 | ||
476 | /* hop penalty of 255 equals 100% */ | |
477 | return throughput * (hop_penalty_max - hop_penalty) / hop_penalty_max; | |
478 | } | |
479 | ||
480 | /** | |
7e9a8c2c | 481 | * batadv_v_ogm_forward() - check conditions and forward an OGM to the given |
efcc9d30 | 482 | * outgoing interface |
9323158e AQ |
483 | * @bat_priv: the bat priv with all the soft interface information |
484 | * @ogm_received: previously received OGM to be forwarded | |
efcc9d30 SW |
485 | * @orig_node: the originator which has been updated |
486 | * @neigh_node: the neigh_node through with the OGM has been received | |
9323158e AQ |
487 | * @if_incoming: the interface on which this OGM was received on |
488 | * @if_outgoing: the interface to which the OGM has to be forwarded to | |
489 | * | |
490 | * Forward an OGM to an interface after having altered the throughput metric and | |
491 | * the TTL value contained in it. The original OGM isn't modified. | |
492 | */ | |
493 | static void batadv_v_ogm_forward(struct batadv_priv *bat_priv, | |
494 | const struct batadv_ogm2_packet *ogm_received, | |
efcc9d30 SW |
495 | struct batadv_orig_node *orig_node, |
496 | struct batadv_neigh_node *neigh_node, | |
9323158e AQ |
497 | struct batadv_hard_iface *if_incoming, |
498 | struct batadv_hard_iface *if_outgoing) | |
499 | { | |
efcc9d30 SW |
500 | struct batadv_neigh_ifinfo *neigh_ifinfo = NULL; |
501 | struct batadv_orig_ifinfo *orig_ifinfo = NULL; | |
502 | struct batadv_neigh_node *router = NULL; | |
9323158e AQ |
503 | struct batadv_ogm2_packet *ogm_forward; |
504 | unsigned char *skb_buff; | |
505 | struct sk_buff *skb; | |
506 | size_t packet_len; | |
507 | u16 tvlv_len; | |
508 | ||
efcc9d30 SW |
509 | /* only forward for specific interfaces, not for the default one. */ |
510 | if (if_outgoing == BATADV_IF_DEFAULT) | |
511 | goto out; | |
512 | ||
513 | orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing); | |
514 | if (!orig_ifinfo) | |
515 | goto out; | |
516 | ||
517 | /* acquire possibly updated router */ | |
518 | router = batadv_orig_router_get(orig_node, if_outgoing); | |
519 | ||
520 | /* strict rule: forward packets coming from the best next hop only */ | |
521 | if (neigh_node != router) | |
522 | goto out; | |
523 | ||
524 | /* don't forward the same seqno twice on one interface */ | |
525 | if (orig_ifinfo->last_seqno_forwarded == ntohl(ogm_received->seqno)) | |
526 | goto out; | |
527 | ||
528 | orig_ifinfo->last_seqno_forwarded = ntohl(ogm_received->seqno); | |
529 | ||
9323158e AQ |
530 | if (ogm_received->ttl <= 1) { |
531 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n"); | |
efcc9d30 | 532 | goto out; |
9323158e AQ |
533 | } |
534 | ||
efcc9d30 SW |
535 | neigh_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing); |
536 | if (!neigh_ifinfo) | |
537 | goto out; | |
538 | ||
9323158e AQ |
539 | tvlv_len = ntohs(ogm_received->tvlv_len); |
540 | ||
541 | packet_len = BATADV_OGM2_HLEN + tvlv_len; | |
542 | skb = netdev_alloc_skb_ip_align(if_outgoing->net_dev, | |
543 | ETH_HLEN + packet_len); | |
544 | if (!skb) | |
efcc9d30 | 545 | goto out; |
9323158e AQ |
546 | |
547 | skb_reserve(skb, ETH_HLEN); | |
59ae1d12 | 548 | skb_buff = skb_put_data(skb, ogm_received, packet_len); |
9323158e AQ |
549 | |
550 | /* apply forward penalty */ | |
551 | ogm_forward = (struct batadv_ogm2_packet *)skb_buff; | |
efcc9d30 | 552 | ogm_forward->throughput = htonl(neigh_ifinfo->bat_v.throughput); |
9323158e AQ |
553 | ogm_forward->ttl--; |
554 | ||
555 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
556 | "Forwarding OGM2 packet on %s: throughput %u, ttl %u, received via %s\n", | |
efcc9d30 SW |
557 | if_outgoing->net_dev->name, ntohl(ogm_forward->throughput), |
558 | ogm_forward->ttl, if_incoming->net_dev->name); | |
9323158e | 559 | |
f89255a0 | 560 | batadv_v_ogm_queue_on_if(skb, if_outgoing); |
efcc9d30 SW |
561 | |
562 | out: | |
563 | if (orig_ifinfo) | |
564 | batadv_orig_ifinfo_put(orig_ifinfo); | |
565 | if (router) | |
566 | batadv_neigh_node_put(router); | |
567 | if (neigh_ifinfo) | |
568 | batadv_neigh_ifinfo_put(neigh_ifinfo); | |
9323158e AQ |
569 | } |
570 | ||
571 | /** | |
7e9a8c2c | 572 | * batadv_v_ogm_metric_update() - update route metric based on OGM |
9323158e AQ |
573 | * @bat_priv: the bat priv with all the soft interface information |
574 | * @ogm2: OGM2 structure | |
575 | * @orig_node: Originator structure for which the OGM has been received | |
576 | * @neigh_node: the neigh_node through with the OGM has been received | |
577 | * @if_incoming: the interface where this packet was received | |
578 | * @if_outgoing: the interface for which the packet should be considered | |
579 | * | |
580 | * Return: | |
581 | * 1 if the OGM is new, | |
582 | * 0 if it is not new but valid, | |
583 | * <0 on error (e.g. old OGM) | |
584 | */ | |
585 | static int batadv_v_ogm_metric_update(struct batadv_priv *bat_priv, | |
586 | const struct batadv_ogm2_packet *ogm2, | |
587 | struct batadv_orig_node *orig_node, | |
588 | struct batadv_neigh_node *neigh_node, | |
589 | struct batadv_hard_iface *if_incoming, | |
590 | struct batadv_hard_iface *if_outgoing) | |
591 | { | |
422d2f77 | 592 | struct batadv_orig_ifinfo *orig_ifinfo; |
9323158e AQ |
593 | struct batadv_neigh_ifinfo *neigh_ifinfo = NULL; |
594 | bool protection_started = false; | |
595 | int ret = -EINVAL; | |
596 | u32 path_throughput; | |
597 | s32 seq_diff; | |
598 | ||
599 | orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing); | |
600 | if (!orig_ifinfo) | |
601 | goto out; | |
602 | ||
603 | seq_diff = ntohl(ogm2->seqno) - orig_ifinfo->last_real_seqno; | |
604 | ||
605 | if (!hlist_empty(&orig_node->neigh_list) && | |
606 | batadv_window_protected(bat_priv, seq_diff, | |
607 | BATADV_OGM_MAX_AGE, | |
608 | &orig_ifinfo->batman_seqno_reset, | |
609 | &protection_started)) { | |
610 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
611 | "Drop packet: packet within window protection time from %pM\n", | |
612 | ogm2->orig); | |
613 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
614 | "Last reset: %ld, %ld\n", | |
615 | orig_ifinfo->batman_seqno_reset, jiffies); | |
616 | goto out; | |
617 | } | |
618 | ||
619 | /* drop packets with old seqnos, however accept the first packet after | |
620 | * a host has been rebooted. | |
621 | */ | |
825ffe1f | 622 | if (seq_diff < 0 && !protection_started) |
9323158e AQ |
623 | goto out; |
624 | ||
625 | neigh_node->last_seen = jiffies; | |
626 | ||
627 | orig_node->last_seen = jiffies; | |
628 | ||
629 | orig_ifinfo->last_real_seqno = ntohl(ogm2->seqno); | |
630 | orig_ifinfo->last_ttl = ogm2->ttl; | |
631 | ||
632 | neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing); | |
633 | if (!neigh_ifinfo) | |
634 | goto out; | |
635 | ||
636 | path_throughput = batadv_v_forward_penalty(bat_priv, if_incoming, | |
637 | if_outgoing, | |
638 | ntohl(ogm2->throughput)); | |
639 | neigh_ifinfo->bat_v.throughput = path_throughput; | |
640 | neigh_ifinfo->bat_v.last_seqno = ntohl(ogm2->seqno); | |
641 | neigh_ifinfo->last_ttl = ogm2->ttl; | |
642 | ||
643 | if (seq_diff > 0 || protection_started) | |
644 | ret = 1; | |
645 | else | |
646 | ret = 0; | |
647 | out: | |
648 | if (orig_ifinfo) | |
649 | batadv_orig_ifinfo_put(orig_ifinfo); | |
650 | if (neigh_ifinfo) | |
651 | batadv_neigh_ifinfo_put(neigh_ifinfo); | |
652 | ||
653 | return ret; | |
654 | } | |
655 | ||
656 | /** | |
7e9a8c2c | 657 | * batadv_v_ogm_route_update() - update routes based on OGM |
9323158e AQ |
658 | * @bat_priv: the bat priv with all the soft interface information |
659 | * @ethhdr: the Ethernet header of the OGM2 | |
660 | * @ogm2: OGM2 structure | |
661 | * @orig_node: Originator structure for which the OGM has been received | |
662 | * @neigh_node: the neigh_node through with the OGM has been received | |
663 | * @if_incoming: the interface where this packet was received | |
664 | * @if_outgoing: the interface for which the packet should be considered | |
efcc9d30 SW |
665 | * |
666 | * Return: true if the packet should be forwarded, false otherwise | |
9323158e | 667 | */ |
efcc9d30 | 668 | static bool batadv_v_ogm_route_update(struct batadv_priv *bat_priv, |
9323158e AQ |
669 | const struct ethhdr *ethhdr, |
670 | const struct batadv_ogm2_packet *ogm2, | |
671 | struct batadv_orig_node *orig_node, | |
672 | struct batadv_neigh_node *neigh_node, | |
673 | struct batadv_hard_iface *if_incoming, | |
674 | struct batadv_hard_iface *if_outgoing) | |
675 | { | |
676 | struct batadv_neigh_node *router = NULL; | |
422d2f77 | 677 | struct batadv_orig_node *orig_neigh_node; |
9323158e | 678 | struct batadv_neigh_node *orig_neigh_router = NULL; |
86de37c1 SW |
679 | struct batadv_neigh_ifinfo *router_ifinfo = NULL, *neigh_ifinfo = NULL; |
680 | u32 router_throughput, neigh_throughput; | |
681 | u32 router_last_seqno; | |
682 | u32 neigh_last_seqno; | |
683 | s32 neigh_seq_diff; | |
efcc9d30 | 684 | bool forward = false; |
9323158e AQ |
685 | |
686 | orig_neigh_node = batadv_v_ogm_orig_get(bat_priv, ethhdr->h_source); | |
687 | if (!orig_neigh_node) | |
688 | goto out; | |
689 | ||
690 | orig_neigh_router = batadv_orig_router_get(orig_neigh_node, | |
691 | if_outgoing); | |
692 | ||
693 | /* drop packet if sender is not a direct neighbor and if we | |
694 | * don't route towards it | |
695 | */ | |
696 | router = batadv_orig_router_get(orig_node, if_outgoing); | |
697 | if (router && router->orig_node != orig_node && !orig_neigh_router) { | |
698 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
699 | "Drop packet: OGM via unknown neighbor!\n"); | |
700 | goto out; | |
701 | } | |
702 | ||
86de37c1 SW |
703 | /* Mark the OGM to be considered for forwarding, and update routes |
704 | * if needed. | |
705 | */ | |
efcc9d30 | 706 | forward = true; |
86de37c1 SW |
707 | |
708 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
709 | "Searching and updating originator entry of received packet\n"); | |
710 | ||
711 | /* if this neighbor already is our next hop there is nothing | |
712 | * to change | |
713 | */ | |
714 | if (router == neigh_node) | |
715 | goto out; | |
716 | ||
717 | /* don't consider neighbours with worse throughput. | |
718 | * also switch route if this seqno is BATADV_V_MAX_ORIGDIFF newer than | |
719 | * the last received seqno from our best next hop. | |
720 | */ | |
721 | if (router) { | |
722 | router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing); | |
723 | neigh_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing); | |
724 | ||
725 | /* if these are not allocated, something is wrong. */ | |
726 | if (!router_ifinfo || !neigh_ifinfo) | |
727 | goto out; | |
728 | ||
729 | neigh_last_seqno = neigh_ifinfo->bat_v.last_seqno; | |
730 | router_last_seqno = router_ifinfo->bat_v.last_seqno; | |
731 | neigh_seq_diff = neigh_last_seqno - router_last_seqno; | |
732 | router_throughput = router_ifinfo->bat_v.throughput; | |
733 | neigh_throughput = neigh_ifinfo->bat_v.throughput; | |
734 | ||
825ffe1f SE |
735 | if (neigh_seq_diff < BATADV_OGM_MAX_ORIGDIFF && |
736 | router_throughput >= neigh_throughput) | |
86de37c1 SW |
737 | goto out; |
738 | } | |
739 | ||
740 | batadv_update_route(bat_priv, orig_node, if_outgoing, neigh_node); | |
9323158e | 741 | out: |
9323158e AQ |
742 | if (router) |
743 | batadv_neigh_node_put(router); | |
744 | if (orig_neigh_router) | |
745 | batadv_neigh_node_put(orig_neigh_router); | |
746 | if (orig_neigh_node) | |
747 | batadv_orig_node_put(orig_neigh_node); | |
86de37c1 SW |
748 | if (router_ifinfo) |
749 | batadv_neigh_ifinfo_put(router_ifinfo); | |
750 | if (neigh_ifinfo) | |
751 | batadv_neigh_ifinfo_put(neigh_ifinfo); | |
efcc9d30 SW |
752 | |
753 | return forward; | |
9323158e AQ |
754 | } |
755 | ||
756 | /** | |
7e9a8c2c | 757 | * batadv_v_ogm_process_per_outif() - process a batman v OGM for an outgoing if |
9323158e AQ |
758 | * @bat_priv: the bat priv with all the soft interface information |
759 | * @ethhdr: the Ethernet header of the OGM2 | |
760 | * @ogm2: OGM2 structure | |
761 | * @orig_node: Originator structure for which the OGM has been received | |
762 | * @neigh_node: the neigh_node through with the OGM has been received | |
763 | * @if_incoming: the interface where this packet was received | |
764 | * @if_outgoing: the interface for which the packet should be considered | |
765 | */ | |
766 | static void | |
767 | batadv_v_ogm_process_per_outif(struct batadv_priv *bat_priv, | |
768 | const struct ethhdr *ethhdr, | |
769 | const struct batadv_ogm2_packet *ogm2, | |
770 | struct batadv_orig_node *orig_node, | |
771 | struct batadv_neigh_node *neigh_node, | |
772 | struct batadv_hard_iface *if_incoming, | |
773 | struct batadv_hard_iface *if_outgoing) | |
774 | { | |
775 | int seqno_age; | |
efcc9d30 | 776 | bool forward; |
9323158e AQ |
777 | |
778 | /* first, update the metric with according sanity checks */ | |
779 | seqno_age = batadv_v_ogm_metric_update(bat_priv, ogm2, orig_node, | |
780 | neigh_node, if_incoming, | |
781 | if_outgoing); | |
782 | ||
783 | /* outdated sequence numbers are to be discarded */ | |
784 | if (seqno_age < 0) | |
785 | return; | |
786 | ||
787 | /* only unknown & newer OGMs contain TVLVs we are interested in */ | |
825ffe1f | 788 | if (seqno_age > 0 && if_outgoing == BATADV_IF_DEFAULT) |
9323158e AQ |
789 | batadv_tvlv_containers_process(bat_priv, true, orig_node, |
790 | NULL, NULL, | |
791 | (unsigned char *)(ogm2 + 1), | |
792 | ntohs(ogm2->tvlv_len)); | |
793 | ||
794 | /* if the metric update went through, update routes if needed */ | |
efcc9d30 SW |
795 | forward = batadv_v_ogm_route_update(bat_priv, ethhdr, ogm2, orig_node, |
796 | neigh_node, if_incoming, | |
797 | if_outgoing); | |
798 | ||
799 | /* if the routes have been processed correctly, check and forward */ | |
800 | if (forward) | |
801 | batadv_v_ogm_forward(bat_priv, ogm2, orig_node, neigh_node, | |
802 | if_incoming, if_outgoing); | |
9323158e AQ |
803 | } |
804 | ||
805 | /** | |
7e9a8c2c | 806 | * batadv_v_ogm_aggr_packet() - checks if there is another OGM aggregated |
9323158e AQ |
807 | * @buff_pos: current position in the skb |
808 | * @packet_len: total length of the skb | |
0ff0f15a | 809 | * @ogm2_packet: potential OGM2 in buffer |
9323158e AQ |
810 | * |
811 | * Return: true if there is enough space for another OGM, false otherwise. | |
812 | */ | |
0ff0f15a SE |
813 | static bool |
814 | batadv_v_ogm_aggr_packet(int buff_pos, int packet_len, | |
815 | const struct batadv_ogm2_packet *ogm2_packet) | |
9323158e AQ |
816 | { |
817 | int next_buff_pos = 0; | |
818 | ||
0ff0f15a SE |
819 | /* check if there is enough space for the header */ |
820 | next_buff_pos += buff_pos + sizeof(*ogm2_packet); | |
821 | if (next_buff_pos > packet_len) | |
822 | return false; | |
823 | ||
824 | /* check if there is enough space for the optional TVLV */ | |
825 | next_buff_pos += ntohs(ogm2_packet->tvlv_len); | |
9323158e AQ |
826 | |
827 | return (next_buff_pos <= packet_len) && | |
828 | (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES); | |
829 | } | |
830 | ||
831 | /** | |
7e9a8c2c | 832 | * batadv_v_ogm_process() - process an incoming batman v OGM |
9323158e AQ |
833 | * @skb: the skb containing the OGM |
834 | * @ogm_offset: offset to the OGM which should be processed (for aggregates) | |
835 | * @if_incoming: the interface where this packet was receved | |
836 | */ | |
837 | static void batadv_v_ogm_process(const struct sk_buff *skb, int ogm_offset, | |
838 | struct batadv_hard_iface *if_incoming) | |
839 | { | |
840 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); | |
841 | struct ethhdr *ethhdr; | |
842 | struct batadv_orig_node *orig_node = NULL; | |
843 | struct batadv_hardif_neigh_node *hardif_neigh = NULL; | |
844 | struct batadv_neigh_node *neigh_node = NULL; | |
845 | struct batadv_hard_iface *hard_iface; | |
846 | struct batadv_ogm2_packet *ogm_packet; | |
847 | u32 ogm_throughput, link_throughput, path_throughput; | |
3111beed | 848 | int ret; |
9323158e AQ |
849 | |
850 | ethhdr = eth_hdr(skb); | |
851 | ogm_packet = (struct batadv_ogm2_packet *)(skb->data + ogm_offset); | |
852 | ||
853 | ogm_throughput = ntohl(ogm_packet->throughput); | |
854 | ||
855 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
f25cbb2a | 856 | "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 |
857 | ethhdr->h_source, if_incoming->net_dev->name, |
858 | if_incoming->net_dev->dev_addr, ogm_packet->orig, | |
859 | ntohl(ogm_packet->seqno), ogm_throughput, ogm_packet->ttl, | |
860 | ogm_packet->version, ntohs(ogm_packet->tvlv_len)); | |
861 | ||
f25cbb2a CIK |
862 | /* If the throughput metric is 0, immediately drop the packet. No need |
863 | * to create orig_node / neigh_node for an unusable route. | |
9323158e AQ |
864 | */ |
865 | if (ogm_throughput == 0) { | |
866 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
f25cbb2a | 867 | "Drop packet: originator packet with throughput metric of 0\n"); |
9323158e AQ |
868 | return; |
869 | } | |
870 | ||
871 | /* require ELP packets be to received from this neighbor first */ | |
872 | hardif_neigh = batadv_hardif_neigh_get(if_incoming, ethhdr->h_source); | |
873 | if (!hardif_neigh) { | |
874 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
875 | "Drop packet: OGM via unknown neighbor!\n"); | |
876 | goto out; | |
877 | } | |
878 | ||
879 | orig_node = batadv_v_ogm_orig_get(bat_priv, ogm_packet->orig); | |
880 | if (!orig_node) | |
881 | return; | |
882 | ||
6f0a6b5e ML |
883 | neigh_node = batadv_neigh_node_get_or_create(orig_node, if_incoming, |
884 | ethhdr->h_source); | |
9323158e AQ |
885 | if (!neigh_node) |
886 | goto out; | |
887 | ||
888 | /* Update the received throughput metric to match the link | |
889 | * characteristic: | |
890 | * - If this OGM traveled one hop so far (emitted by single hop | |
891 | * neighbor) the path throughput metric equals the link throughput. | |
892 | * - For OGMs traversing more than hop the path throughput metric is | |
893 | * the smaller of the path throughput and the link throughput. | |
894 | */ | |
895 | link_throughput = ewma_throughput_read(&hardif_neigh->bat_v.throughput); | |
896 | path_throughput = min_t(u32, link_throughput, ogm_throughput); | |
897 | ogm_packet->throughput = htonl(path_throughput); | |
898 | ||
899 | batadv_v_ogm_process_per_outif(bat_priv, ethhdr, ogm_packet, orig_node, | |
900 | neigh_node, if_incoming, | |
901 | BATADV_IF_DEFAULT); | |
902 | ||
903 | rcu_read_lock(); | |
904 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { | |
905 | if (hard_iface->if_status != BATADV_IF_ACTIVE) | |
906 | continue; | |
907 | ||
908 | if (hard_iface->soft_iface != bat_priv->soft_iface) | |
909 | continue; | |
910 | ||
27353446 SE |
911 | if (!kref_get_unless_zero(&hard_iface->refcount)) |
912 | continue; | |
913 | ||
3111beed LL |
914 | ret = batadv_hardif_no_broadcast(hard_iface, |
915 | ogm_packet->orig, | |
916 | hardif_neigh->orig); | |
917 | ||
918 | if (ret) { | |
919 | char *type; | |
920 | ||
921 | switch (ret) { | |
922 | case BATADV_HARDIF_BCAST_NORECIPIENT: | |
923 | type = "no neighbor"; | |
924 | break; | |
925 | case BATADV_HARDIF_BCAST_DUPFWD: | |
926 | type = "single neighbor is source"; | |
927 | break; | |
928 | case BATADV_HARDIF_BCAST_DUPORIG: | |
929 | type = "single neighbor is originator"; | |
930 | break; | |
931 | default: | |
932 | type = "unknown"; | |
933 | } | |
934 | ||
f25cbb2a | 935 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "OGM2 packet from %pM on %s suppressed: %s\n", |
3111beed LL |
936 | ogm_packet->orig, hard_iface->net_dev->name, |
937 | type); | |
938 | ||
939 | batadv_hardif_put(hard_iface); | |
940 | continue; | |
941 | } | |
942 | ||
9323158e AQ |
943 | batadv_v_ogm_process_per_outif(bat_priv, ethhdr, ogm_packet, |
944 | orig_node, neigh_node, | |
945 | if_incoming, hard_iface); | |
27353446 SE |
946 | |
947 | batadv_hardif_put(hard_iface); | |
9323158e AQ |
948 | } |
949 | rcu_read_unlock(); | |
950 | out: | |
951 | if (orig_node) | |
952 | batadv_orig_node_put(orig_node); | |
953 | if (neigh_node) | |
954 | batadv_neigh_node_put(neigh_node); | |
955 | if (hardif_neigh) | |
956 | batadv_hardif_neigh_put(hardif_neigh); | |
957 | } | |
958 | ||
0da00359 | 959 | /** |
7e9a8c2c | 960 | * batadv_v_ogm_packet_recv() - OGM2 receiving handler |
0da00359 AQ |
961 | * @skb: the received OGM |
962 | * @if_incoming: the interface where this OGM has been received | |
963 | * | |
964 | * Return: NET_RX_SUCCESS and consume the skb on success or returns NET_RX_DROP | |
965 | * (without freeing the skb) on failure | |
966 | */ | |
967 | int batadv_v_ogm_packet_recv(struct sk_buff *skb, | |
968 | struct batadv_hard_iface *if_incoming) | |
969 | { | |
970 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); | |
971 | struct batadv_ogm2_packet *ogm_packet; | |
972 | struct ethhdr *ethhdr = eth_hdr(skb); | |
9323158e AQ |
973 | int ogm_offset; |
974 | u8 *packet_pos; | |
975 | int ret = NET_RX_DROP; | |
0da00359 AQ |
976 | |
977 | /* did we receive a OGM2 packet on an interface that does not have | |
978 | * B.A.T.M.A.N. V enabled ? | |
979 | */ | |
29824a55 | 980 | if (strcmp(bat_priv->algo_ops->name, "BATMAN_V") != 0) |
b91a2543 | 981 | goto free_skb; |
0da00359 AQ |
982 | |
983 | if (!batadv_check_management_packet(skb, if_incoming, BATADV_OGM2_HLEN)) | |
b91a2543 | 984 | goto free_skb; |
0da00359 AQ |
985 | |
986 | if (batadv_is_my_mac(bat_priv, ethhdr->h_source)) | |
b91a2543 | 987 | goto free_skb; |
0da00359 AQ |
988 | |
989 | ogm_packet = (struct batadv_ogm2_packet *)skb->data; | |
990 | ||
991 | if (batadv_is_my_mac(bat_priv, ogm_packet->orig)) | |
b91a2543 | 992 | goto free_skb; |
0da00359 AQ |
993 | |
994 | batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX); | |
995 | batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES, | |
996 | skb->len + ETH_HLEN); | |
997 | ||
9323158e AQ |
998 | ogm_offset = 0; |
999 | ogm_packet = (struct batadv_ogm2_packet *)skb->data; | |
1000 | ||
1001 | while (batadv_v_ogm_aggr_packet(ogm_offset, skb_headlen(skb), | |
0ff0f15a | 1002 | ogm_packet)) { |
9323158e AQ |
1003 | batadv_v_ogm_process(skb, ogm_offset, if_incoming); |
1004 | ||
1005 | ogm_offset += BATADV_OGM2_HLEN; | |
1006 | ogm_offset += ntohs(ogm_packet->tvlv_len); | |
1007 | ||
1008 | packet_pos = skb->data + ogm_offset; | |
1009 | ogm_packet = (struct batadv_ogm2_packet *)packet_pos; | |
1010 | } | |
1011 | ||
1012 | ret = NET_RX_SUCCESS; | |
b91a2543 SE |
1013 | |
1014 | free_skb: | |
1015 | if (ret == NET_RX_SUCCESS) | |
1016 | consume_skb(skb); | |
1017 | else | |
1018 | kfree_skb(skb); | |
9323158e AQ |
1019 | |
1020 | return ret; | |
0da00359 AQ |
1021 | } |
1022 | ||
1023 | /** | |
7e9a8c2c | 1024 | * batadv_v_ogm_init() - initialise the OGM2 engine |
0da00359 AQ |
1025 | * @bat_priv: the bat priv with all the soft interface information |
1026 | * | |
1027 | * Return: 0 on success or a negative error code in case of failure | |
1028 | */ | |
1029 | int batadv_v_ogm_init(struct batadv_priv *bat_priv) | |
1030 | { | |
1031 | struct batadv_ogm2_packet *ogm_packet; | |
1032 | unsigned char *ogm_buff; | |
1033 | u32 random_seqno; | |
1034 | ||
1035 | bat_priv->bat_v.ogm_buff_len = BATADV_OGM2_HLEN; | |
1036 | ogm_buff = kzalloc(bat_priv->bat_v.ogm_buff_len, GFP_ATOMIC); | |
1037 | if (!ogm_buff) | |
1038 | return -ENOMEM; | |
1039 | ||
1040 | bat_priv->bat_v.ogm_buff = ogm_buff; | |
1041 | ogm_packet = (struct batadv_ogm2_packet *)ogm_buff; | |
1042 | ogm_packet->packet_type = BATADV_OGM2; | |
1043 | ogm_packet->version = BATADV_COMPAT_VERSION; | |
1044 | ogm_packet->ttl = BATADV_TTL; | |
1045 | ogm_packet->flags = BATADV_NO_FLAGS; | |
1046 | ogm_packet->throughput = htonl(BATADV_THROUGHPUT_MAX_VALUE); | |
1047 | ||
1048 | /* randomize initial seqno to avoid collision */ | |
1049 | get_random_bytes(&random_seqno, sizeof(random_seqno)); | |
1050 | atomic_set(&bat_priv->bat_v.ogm_seqno, random_seqno); | |
1051 | INIT_DELAYED_WORK(&bat_priv->bat_v.ogm_wq, batadv_v_ogm_send); | |
1052 | ||
1053 | return 0; | |
1054 | } | |
1055 | ||
1056 | /** | |
7e9a8c2c | 1057 | * batadv_v_ogm_free() - free OGM private resources |
0da00359 AQ |
1058 | * @bat_priv: the bat priv with all the soft interface information |
1059 | */ | |
1060 | void batadv_v_ogm_free(struct batadv_priv *bat_priv) | |
1061 | { | |
1062 | cancel_delayed_work_sync(&bat_priv->bat_v.ogm_wq); | |
1063 | ||
1064 | kfree(bat_priv->bat_v.ogm_buff); | |
1065 | bat_priv->bat_v.ogm_buff = NULL; | |
1066 | bat_priv->bat_v.ogm_buff_len = 0; | |
1067 | } |