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> | |
eb7da4f1 | 12 | #include <linux/container_of.h> |
0da00359 AQ |
13 | #include <linux/errno.h> |
14 | #include <linux/etherdevice.h> | |
b92b94ac | 15 | #include <linux/gfp.h> |
0da00359 AQ |
16 | #include <linux/if_ether.h> |
17 | #include <linux/jiffies.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 AQ |
23 | #include <linux/netdevice.h> |
24 | #include <linux/random.h> | |
25 | #include <linux/rculist.h> | |
26 | #include <linux/rcupdate.h> | |
27 | #include <linux/skbuff.h> | |
28 | #include <linux/slab.h> | |
f89255a0 | 29 | #include <linux/spinlock.h> |
0da00359 AQ |
30 | #include <linux/stddef.h> |
31 | #include <linux/string.h> | |
32 | #include <linux/types.h> | |
33 | #include <linux/workqueue.h> | |
fec149f5 | 34 | #include <uapi/linux/batadv_packet.h> |
0da00359 | 35 | |
01d350d1 | 36 | #include "bat_algo.h" |
0da00359 | 37 | #include "hard-interface.h" |
9323158e | 38 | #include "hash.h" |
ba412080 | 39 | #include "log.h" |
9323158e | 40 | #include "originator.h" |
0da00359 AQ |
41 | #include "routing.h" |
42 | #include "send.h" | |
43 | #include "translation-table.h" | |
1f8dce49 | 44 | #include "tvlv.h" |
0da00359 | 45 | |
9323158e | 46 | /** |
7e9a8c2c | 47 | * batadv_v_ogm_orig_get() - retrieve and possibly create an originator node |
9323158e AQ |
48 | * @bat_priv: the bat priv with all the soft interface information |
49 | * @addr: the address of the originator | |
50 | * | |
bccb48c8 SE |
51 | * Return: the orig_node corresponding to the specified address. If such an |
52 | * object does not exist, it is allocated here. In case of allocation failure | |
53 | * returns NULL. | |
9323158e AQ |
54 | */ |
55 | struct batadv_orig_node *batadv_v_ogm_orig_get(struct batadv_priv *bat_priv, | |
56 | const u8 *addr) | |
57 | { | |
58 | struct batadv_orig_node *orig_node; | |
59 | int hash_added; | |
60 | ||
61 | orig_node = batadv_orig_hash_find(bat_priv, addr); | |
62 | if (orig_node) | |
63 | return orig_node; | |
64 | ||
65 | orig_node = batadv_orig_node_new(bat_priv, addr); | |
66 | if (!orig_node) | |
67 | return NULL; | |
68 | ||
55db2d59 | 69 | kref_get(&orig_node->refcount); |
9323158e AQ |
70 | hash_added = batadv_hash_add(bat_priv->orig_hash, batadv_compare_orig, |
71 | batadv_choose_orig, orig_node, | |
72 | &orig_node->hash_entry); | |
73 | if (hash_added != 0) { | |
55db2d59 | 74 | /* remove refcnt for newly created orig_node and hash entry */ |
9323158e AQ |
75 | batadv_orig_node_put(orig_node); |
76 | batadv_orig_node_put(orig_node); | |
77 | orig_node = NULL; | |
78 | } | |
79 | ||
80 | return orig_node; | |
81 | } | |
82 | ||
f89255a0 LL |
83 | /** |
84 | * batadv_v_ogm_start_queue_timer() - restart the OGM aggregation timer | |
85 | * @hard_iface: the interface to use to send the OGM | |
86 | */ | |
87 | static void batadv_v_ogm_start_queue_timer(struct batadv_hard_iface *hard_iface) | |
88 | { | |
89 | unsigned int msecs = BATADV_MAX_AGGREGATION_MS * 1000; | |
90 | ||
91 | /* msecs * [0.9, 1.1] */ | |
8032bf12 | 92 | msecs += get_random_u32_below(msecs / 5) - (msecs / 10); |
f89255a0 LL |
93 | queue_delayed_work(batadv_event_workqueue, &hard_iface->bat_v.aggr_wq, |
94 | msecs_to_jiffies(msecs / 1000)); | |
95 | } | |
96 | ||
0da00359 | 97 | /** |
7e9a8c2c | 98 | * batadv_v_ogm_start_timer() - restart the OGM sending timer |
0da00359 AQ |
99 | * @bat_priv: the bat priv with all the soft interface information |
100 | */ | |
101 | static void batadv_v_ogm_start_timer(struct batadv_priv *bat_priv) | |
102 | { | |
103 | unsigned long msecs; | |
104 | /* this function may be invoked in different contexts (ogm rescheduling | |
105 | * or hard_iface activation), but the work timer should not be reset | |
106 | */ | |
107 | if (delayed_work_pending(&bat_priv->bat_v.ogm_wq)) | |
108 | return; | |
109 | ||
110 | msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER; | |
8032bf12 | 111 | msecs += get_random_u32_below(2 * BATADV_JITTER); |
0da00359 AQ |
112 | queue_delayed_work(batadv_event_workqueue, &bat_priv->bat_v.ogm_wq, |
113 | msecs_to_jiffies(msecs)); | |
114 | } | |
115 | ||
116 | /** | |
7e9a8c2c | 117 | * batadv_v_ogm_send_to_if() - send a batman ogm using a given interface |
0da00359 AQ |
118 | * @skb: the OGM to send |
119 | * @hard_iface: the interface to use to send the OGM | |
120 | */ | |
121 | static void batadv_v_ogm_send_to_if(struct sk_buff *skb, | |
122 | struct batadv_hard_iface *hard_iface) | |
123 | { | |
124 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); | |
125 | ||
126 | if (hard_iface->if_status != BATADV_IF_ACTIVE) | |
127 | return; | |
128 | ||
129 | batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX); | |
130 | batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES, | |
131 | skb->len + ETH_HLEN); | |
132 | ||
95d39278 | 133 | batadv_send_broadcast_skb(skb, hard_iface); |
0da00359 AQ |
134 | } |
135 | ||
f89255a0 LL |
136 | /** |
137 | * batadv_v_ogm_len() - OGMv2 packet length | |
138 | * @skb: the OGM to check | |
139 | * | |
140 | * Return: Length of the given OGMv2 packet, including tvlv length, excluding | |
141 | * ethernet header length. | |
142 | */ | |
143 | static unsigned int batadv_v_ogm_len(struct sk_buff *skb) | |
144 | { | |
145 | struct batadv_ogm2_packet *ogm_packet; | |
146 | ||
147 | ogm_packet = (struct batadv_ogm2_packet *)skb->data; | |
148 | return BATADV_OGM2_HLEN + ntohs(ogm_packet->tvlv_len); | |
149 | } | |
150 | ||
151 | /** | |
152 | * batadv_v_ogm_queue_left() - check if given OGM still fits aggregation queue | |
153 | * @skb: the OGM to check | |
154 | * @hard_iface: the interface to use to send the OGM | |
155 | * | |
baa1e8a0 | 156 | * Caller needs to hold the hard_iface->bat_v.aggr_list.lock. |
f89255a0 LL |
157 | * |
158 | * Return: True, if the given OGMv2 packet still fits, false otherwise. | |
159 | */ | |
160 | static bool batadv_v_ogm_queue_left(struct sk_buff *skb, | |
161 | struct batadv_hard_iface *hard_iface) | |
162 | { | |
163 | unsigned int max = min_t(unsigned int, hard_iface->net_dev->mtu, | |
164 | BATADV_MAX_AGGREGATION_BYTES); | |
165 | unsigned int ogm_len = batadv_v_ogm_len(skb); | |
166 | ||
baa1e8a0 | 167 | lockdep_assert_held(&hard_iface->bat_v.aggr_list.lock); |
f89255a0 LL |
168 | |
169 | return hard_iface->bat_v.aggr_len + ogm_len <= max; | |
170 | } | |
171 | ||
172 | /** | |
173 | * batadv_v_ogm_aggr_list_free - free all elements in an aggregation queue | |
174 | * @hard_iface: the interface holding the aggregation queue | |
175 | * | |
bccb48c8 | 176 | * Empties the OGMv2 aggregation queue and frees all the skbs it contains. |
f89255a0 | 177 | * |
baa1e8a0 | 178 | * Caller needs to hold the hard_iface->bat_v.aggr_list.lock. |
f89255a0 LL |
179 | */ |
180 | static void batadv_v_ogm_aggr_list_free(struct batadv_hard_iface *hard_iface) | |
181 | { | |
baa1e8a0 | 182 | lockdep_assert_held(&hard_iface->bat_v.aggr_list.lock); |
f89255a0 | 183 | |
baa1e8a0 | 184 | __skb_queue_purge(&hard_iface->bat_v.aggr_list); |
f89255a0 LL |
185 | hard_iface->bat_v.aggr_len = 0; |
186 | } | |
187 | ||
188 | /** | |
189 | * batadv_v_ogm_aggr_send() - flush & send aggregation queue | |
190 | * @hard_iface: the interface with the aggregation queue to flush | |
191 | * | |
9cb9a178 LL |
192 | * Aggregates all OGMv2 packets currently in the aggregation queue into a |
193 | * single OGMv2 packet and transmits this aggregate. | |
194 | * | |
195 | * The aggregation queue is empty after this call. | |
196 | * | |
baa1e8a0 | 197 | * Caller needs to hold the hard_iface->bat_v.aggr_list.lock. |
f89255a0 LL |
198 | */ |
199 | static void batadv_v_ogm_aggr_send(struct batadv_hard_iface *hard_iface) | |
200 | { | |
9cb9a178 LL |
201 | unsigned int aggr_len = hard_iface->bat_v.aggr_len; |
202 | struct sk_buff *skb_aggr; | |
203 | unsigned int ogm_len; | |
f89255a0 LL |
204 | struct sk_buff *skb; |
205 | ||
baa1e8a0 | 206 | lockdep_assert_held(&hard_iface->bat_v.aggr_list.lock); |
f89255a0 | 207 | |
9cb9a178 LL |
208 | if (!aggr_len) |
209 | return; | |
210 | ||
211 | skb_aggr = dev_alloc_skb(aggr_len + ETH_HLEN + NET_IP_ALIGN); | |
212 | if (!skb_aggr) { | |
213 | batadv_v_ogm_aggr_list_free(hard_iface); | |
214 | return; | |
215 | } | |
216 | ||
217 | skb_reserve(skb_aggr, ETH_HLEN + NET_IP_ALIGN); | |
218 | skb_reset_network_header(skb_aggr); | |
219 | ||
baa1e8a0 | 220 | while ((skb = __skb_dequeue(&hard_iface->bat_v.aggr_list))) { |
f89255a0 | 221 | hard_iface->bat_v.aggr_len -= batadv_v_ogm_len(skb); |
9cb9a178 LL |
222 | |
223 | ogm_len = batadv_v_ogm_len(skb); | |
224 | skb_put_data(skb_aggr, skb->data, ogm_len); | |
225 | ||
226 | consume_skb(skb); | |
f89255a0 | 227 | } |
9cb9a178 LL |
228 | |
229 | batadv_v_ogm_send_to_if(skb_aggr, hard_iface); | |
f89255a0 LL |
230 | } |
231 | ||
232 | /** | |
233 | * batadv_v_ogm_queue_on_if() - queue a batman ogm on a given interface | |
234 | * @skb: the OGM to queue | |
235 | * @hard_iface: the interface to queue the OGM on | |
236 | */ | |
237 | static void batadv_v_ogm_queue_on_if(struct sk_buff *skb, | |
238 | struct batadv_hard_iface *hard_iface) | |
239 | { | |
240 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); | |
241 | ||
242 | if (!atomic_read(&bat_priv->aggregated_ogms)) { | |
243 | batadv_v_ogm_send_to_if(skb, hard_iface); | |
244 | return; | |
245 | } | |
246 | ||
baa1e8a0 | 247 | spin_lock_bh(&hard_iface->bat_v.aggr_list.lock); |
f89255a0 LL |
248 | if (!batadv_v_ogm_queue_left(skb, hard_iface)) |
249 | batadv_v_ogm_aggr_send(hard_iface); | |
250 | ||
251 | hard_iface->bat_v.aggr_len += batadv_v_ogm_len(skb); | |
baa1e8a0 CJ |
252 | __skb_queue_tail(&hard_iface->bat_v.aggr_list, skb); |
253 | spin_unlock_bh(&hard_iface->bat_v.aggr_list.lock); | |
f89255a0 LL |
254 | } |
255 | ||
0da00359 | 256 | /** |
a8d23cbb SE |
257 | * batadv_v_ogm_send_softif() - periodic worker broadcasting the own OGM |
258 | * @bat_priv: the bat priv with all the soft interface information | |
0da00359 | 259 | */ |
a8d23cbb | 260 | static void batadv_v_ogm_send_softif(struct batadv_priv *bat_priv) |
0da00359 AQ |
261 | { |
262 | struct batadv_hard_iface *hard_iface; | |
0da00359 AQ |
263 | struct batadv_ogm2_packet *ogm_packet; |
264 | struct sk_buff *skb, *skb_tmp; | |
e04de486 | 265 | unsigned char *ogm_buff; |
0da00359 AQ |
266 | int ogm_buff_len; |
267 | u16 tvlv_len = 0; | |
3111beed | 268 | int ret; |
0da00359 | 269 | |
a8d23cbb | 270 | lockdep_assert_held(&bat_priv->bat_v.ogm_buff_mutex); |
0da00359 AQ |
271 | |
272 | if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING) | |
273 | goto out; | |
274 | ||
275 | ogm_buff = bat_priv->bat_v.ogm_buff; | |
276 | ogm_buff_len = bat_priv->bat_v.ogm_buff_len; | |
277 | /* tt changes have to be committed before the tvlv data is | |
278 | * appended as it may alter the tt tvlv container | |
279 | */ | |
280 | batadv_tt_local_commit_changes(bat_priv); | |
281 | tvlv_len = batadv_tvlv_container_ogm_append(bat_priv, &ogm_buff, | |
282 | &ogm_buff_len, | |
283 | BATADV_OGM2_HLEN); | |
284 | ||
285 | bat_priv->bat_v.ogm_buff = ogm_buff; | |
286 | bat_priv->bat_v.ogm_buff_len = ogm_buff_len; | |
287 | ||
288 | skb = netdev_alloc_skb_ip_align(NULL, ETH_HLEN + ogm_buff_len); | |
289 | if (!skb) | |
290 | goto reschedule; | |
291 | ||
292 | skb_reserve(skb, ETH_HLEN); | |
e04de486 | 293 | skb_put_data(skb, ogm_buff, ogm_buff_len); |
0da00359 AQ |
294 | |
295 | ogm_packet = (struct batadv_ogm2_packet *)skb->data; | |
296 | ogm_packet->seqno = htonl(atomic_read(&bat_priv->bat_v.ogm_seqno)); | |
297 | atomic_inc(&bat_priv->bat_v.ogm_seqno); | |
298 | ogm_packet->tvlv_len = htons(tvlv_len); | |
299 | ||
300 | /* broadcast on every interface */ | |
301 | rcu_read_lock(); | |
302 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { | |
303 | if (hard_iface->soft_iface != bat_priv->soft_iface) | |
304 | continue; | |
305 | ||
27353446 SE |
306 | if (!kref_get_unless_zero(&hard_iface->refcount)) |
307 | continue; | |
308 | ||
3111beed LL |
309 | ret = batadv_hardif_no_broadcast(hard_iface, NULL, NULL); |
310 | if (ret) { | |
311 | char *type; | |
312 | ||
313 | switch (ret) { | |
314 | case BATADV_HARDIF_BCAST_NORECIPIENT: | |
315 | type = "no neighbor"; | |
316 | break; | |
317 | case BATADV_HARDIF_BCAST_DUPFWD: | |
318 | type = "single neighbor is source"; | |
319 | break; | |
320 | case BATADV_HARDIF_BCAST_DUPORIG: | |
321 | type = "single neighbor is originator"; | |
322 | break; | |
323 | default: | |
324 | type = "unknown"; | |
325 | } | |
326 | ||
f25cbb2a | 327 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "OGM2 from ourselves on %s suppressed: %s\n", |
3111beed LL |
328 | hard_iface->net_dev->name, type); |
329 | ||
330 | batadv_hardif_put(hard_iface); | |
331 | continue; | |
332 | } | |
333 | ||
0da00359 AQ |
334 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
335 | "Sending own OGM2 packet (originator %pM, seqno %u, throughput %u, TTL %d) on interface %s [%pM]\n", | |
336 | ogm_packet->orig, ntohl(ogm_packet->seqno), | |
337 | ntohl(ogm_packet->throughput), ogm_packet->ttl, | |
338 | hard_iface->net_dev->name, | |
339 | hard_iface->net_dev->dev_addr); | |
340 | ||
341 | /* this skb gets consumed by batadv_v_ogm_send_to_if() */ | |
342 | skb_tmp = skb_clone(skb, GFP_ATOMIC); | |
27353446 SE |
343 | if (!skb_tmp) { |
344 | batadv_hardif_put(hard_iface); | |
0da00359 | 345 | break; |
27353446 | 346 | } |
0da00359 | 347 | |
f89255a0 | 348 | batadv_v_ogm_queue_on_if(skb_tmp, hard_iface); |
27353446 | 349 | batadv_hardif_put(hard_iface); |
0da00359 AQ |
350 | } |
351 | rcu_read_unlock(); | |
352 | ||
353 | consume_skb(skb); | |
354 | ||
355 | reschedule: | |
356 | batadv_v_ogm_start_timer(bat_priv); | |
357 | out: | |
358 | return; | |
359 | } | |
360 | ||
a8d23cbb SE |
361 | /** |
362 | * batadv_v_ogm_send() - periodic worker broadcasting the own OGM | |
363 | * @work: work queue item | |
364 | */ | |
365 | static void batadv_v_ogm_send(struct work_struct *work) | |
366 | { | |
367 | struct batadv_priv_bat_v *bat_v; | |
368 | struct batadv_priv *bat_priv; | |
369 | ||
370 | bat_v = container_of(work, struct batadv_priv_bat_v, ogm_wq.work); | |
371 | bat_priv = container_of(bat_v, struct batadv_priv, bat_v); | |
372 | ||
373 | mutex_lock(&bat_priv->bat_v.ogm_buff_mutex); | |
374 | batadv_v_ogm_send_softif(bat_priv); | |
375 | mutex_unlock(&bat_priv->bat_v.ogm_buff_mutex); | |
376 | } | |
377 | ||
f89255a0 LL |
378 | /** |
379 | * batadv_v_ogm_aggr_work() - OGM queue periodic task per interface | |
380 | * @work: work queue item | |
381 | * | |
bccb48c8 | 382 | * Emits aggregated OGM messages in regular intervals. |
f89255a0 LL |
383 | */ |
384 | void batadv_v_ogm_aggr_work(struct work_struct *work) | |
385 | { | |
386 | struct batadv_hard_iface_bat_v *batv; | |
387 | struct batadv_hard_iface *hard_iface; | |
388 | ||
389 | batv = container_of(work, struct batadv_hard_iface_bat_v, aggr_wq.work); | |
390 | hard_iface = container_of(batv, struct batadv_hard_iface, bat_v); | |
391 | ||
baa1e8a0 | 392 | spin_lock_bh(&hard_iface->bat_v.aggr_list.lock); |
f89255a0 | 393 | batadv_v_ogm_aggr_send(hard_iface); |
baa1e8a0 | 394 | spin_unlock_bh(&hard_iface->bat_v.aggr_list.lock); |
f89255a0 LL |
395 | |
396 | batadv_v_ogm_start_queue_timer(hard_iface); | |
397 | } | |
398 | ||
0da00359 | 399 | /** |
7e9a8c2c | 400 | * batadv_v_ogm_iface_enable() - prepare an interface for B.A.T.M.A.N. V |
0da00359 AQ |
401 | * @hard_iface: the interface to prepare |
402 | * | |
bccb48c8 | 403 | * Takes care of scheduling its own OGM sending routine for this interface. |
0da00359 AQ |
404 | * |
405 | * Return: 0 on success or a negative error code otherwise | |
406 | */ | |
407 | int batadv_v_ogm_iface_enable(struct batadv_hard_iface *hard_iface) | |
408 | { | |
409 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); | |
410 | ||
f89255a0 | 411 | batadv_v_ogm_start_queue_timer(hard_iface); |
0da00359 AQ |
412 | batadv_v_ogm_start_timer(bat_priv); |
413 | ||
414 | return 0; | |
415 | } | |
416 | ||
f89255a0 LL |
417 | /** |
418 | * batadv_v_ogm_iface_disable() - release OGM interface private resources | |
419 | * @hard_iface: interface for which the resources have to be released | |
420 | */ | |
421 | void batadv_v_ogm_iface_disable(struct batadv_hard_iface *hard_iface) | |
422 | { | |
423 | cancel_delayed_work_sync(&hard_iface->bat_v.aggr_wq); | |
424 | ||
baa1e8a0 | 425 | spin_lock_bh(&hard_iface->bat_v.aggr_list.lock); |
f89255a0 | 426 | batadv_v_ogm_aggr_list_free(hard_iface); |
baa1e8a0 | 427 | spin_unlock_bh(&hard_iface->bat_v.aggr_list.lock); |
f89255a0 LL |
428 | } |
429 | ||
0da00359 | 430 | /** |
7e9a8c2c | 431 | * batadv_v_ogm_primary_iface_set() - set a new primary interface |
0da00359 AQ |
432 | * @primary_iface: the new primary interface |
433 | */ | |
434 | void batadv_v_ogm_primary_iface_set(struct batadv_hard_iface *primary_iface) | |
435 | { | |
436 | struct batadv_priv *bat_priv = netdev_priv(primary_iface->soft_iface); | |
437 | struct batadv_ogm2_packet *ogm_packet; | |
438 | ||
a8d23cbb | 439 | mutex_lock(&bat_priv->bat_v.ogm_buff_mutex); |
0da00359 | 440 | if (!bat_priv->bat_v.ogm_buff) |
a8d23cbb | 441 | goto unlock; |
0da00359 AQ |
442 | |
443 | ogm_packet = (struct batadv_ogm2_packet *)bat_priv->bat_v.ogm_buff; | |
444 | ether_addr_copy(ogm_packet->orig, primary_iface->net_dev->dev_addr); | |
a8d23cbb SE |
445 | |
446 | unlock: | |
447 | mutex_unlock(&bat_priv->bat_v.ogm_buff_mutex); | |
0da00359 AQ |
448 | } |
449 | ||
9323158e | 450 | /** |
7e9a8c2c SE |
451 | * batadv_v_forward_penalty() - apply a penalty to the throughput metric |
452 | * forwarded with B.A.T.M.A.N. V OGMs | |
9323158e AQ |
453 | * @bat_priv: the bat priv with all the soft interface information |
454 | * @if_incoming: the interface where the OGM has been received | |
455 | * @if_outgoing: the interface where the OGM has to be forwarded to | |
456 | * @throughput: the current throughput | |
457 | * | |
458 | * Apply a penalty on the current throughput metric value based on the | |
3bda14d0 LL |
459 | * characteristic of the interface where the OGM has been received. |
460 | * | |
461 | * Initially the per hardif hop penalty is applied to the throughput. After | |
462 | * that the return value is then computed as follows: | |
9323158e AQ |
463 | * - throughput * 50% if the incoming and outgoing interface are the |
464 | * same WiFi interface and the throughput is above | |
465 | * 1MBit/s | |
466 | * - throughput if the outgoing interface is the default | |
467 | * interface (i.e. this OGM is processed for the | |
468 | * internal table and not forwarded) | |
3bda14d0 | 469 | * - throughput * node hop penalty otherwise |
9323158e AQ |
470 | * |
471 | * Return: the penalised throughput metric. | |
472 | */ | |
473 | static u32 batadv_v_forward_penalty(struct batadv_priv *bat_priv, | |
474 | struct batadv_hard_iface *if_incoming, | |
475 | struct batadv_hard_iface *if_outgoing, | |
476 | u32 throughput) | |
477 | { | |
3bda14d0 | 478 | int if_hop_penalty = atomic_read(&if_incoming->hop_penalty); |
9323158e AQ |
479 | int hop_penalty = atomic_read(&bat_priv->hop_penalty); |
480 | int hop_penalty_max = BATADV_TQ_MAX_VALUE; | |
481 | ||
3bda14d0 LL |
482 | /* Apply per hardif hop penalty */ |
483 | throughput = throughput * (hop_penalty_max - if_hop_penalty) / | |
484 | hop_penalty_max; | |
485 | ||
9323158e AQ |
486 | /* Don't apply hop penalty in default originator table. */ |
487 | if (if_outgoing == BATADV_IF_DEFAULT) | |
488 | return throughput; | |
489 | ||
490 | /* Forwarding on the same WiFi interface cuts the throughput in half | |
491 | * due to the store & forward characteristics of WIFI. | |
492 | * Very low throughput values are the exception. | |
493 | */ | |
825ffe1f SE |
494 | if (throughput > 10 && |
495 | if_incoming == if_outgoing && | |
c833484e | 496 | !(if_incoming->bat_v.flags & BATADV_FULL_DUPLEX)) |
9323158e AQ |
497 | return throughput / 2; |
498 | ||
499 | /* hop penalty of 255 equals 100% */ | |
500 | return throughput * (hop_penalty_max - hop_penalty) / hop_penalty_max; | |
501 | } | |
502 | ||
503 | /** | |
7e9a8c2c | 504 | * batadv_v_ogm_forward() - check conditions and forward an OGM to the given |
efcc9d30 | 505 | * outgoing interface |
9323158e AQ |
506 | * @bat_priv: the bat priv with all the soft interface information |
507 | * @ogm_received: previously received OGM to be forwarded | |
efcc9d30 SW |
508 | * @orig_node: the originator which has been updated |
509 | * @neigh_node: the neigh_node through with the OGM has been received | |
9323158e AQ |
510 | * @if_incoming: the interface on which this OGM was received on |
511 | * @if_outgoing: the interface to which the OGM has to be forwarded to | |
512 | * | |
513 | * Forward an OGM to an interface after having altered the throughput metric and | |
514 | * the TTL value contained in it. The original OGM isn't modified. | |
515 | */ | |
516 | static void batadv_v_ogm_forward(struct batadv_priv *bat_priv, | |
517 | const struct batadv_ogm2_packet *ogm_received, | |
efcc9d30 SW |
518 | struct batadv_orig_node *orig_node, |
519 | struct batadv_neigh_node *neigh_node, | |
9323158e AQ |
520 | struct batadv_hard_iface *if_incoming, |
521 | struct batadv_hard_iface *if_outgoing) | |
522 | { | |
efcc9d30 SW |
523 | struct batadv_neigh_ifinfo *neigh_ifinfo = NULL; |
524 | struct batadv_orig_ifinfo *orig_ifinfo = NULL; | |
525 | struct batadv_neigh_node *router = NULL; | |
9323158e AQ |
526 | struct batadv_ogm2_packet *ogm_forward; |
527 | unsigned char *skb_buff; | |
528 | struct sk_buff *skb; | |
529 | size_t packet_len; | |
530 | u16 tvlv_len; | |
531 | ||
efcc9d30 SW |
532 | /* only forward for specific interfaces, not for the default one. */ |
533 | if (if_outgoing == BATADV_IF_DEFAULT) | |
534 | goto out; | |
535 | ||
536 | orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing); | |
537 | if (!orig_ifinfo) | |
538 | goto out; | |
539 | ||
540 | /* acquire possibly updated router */ | |
541 | router = batadv_orig_router_get(orig_node, if_outgoing); | |
542 | ||
543 | /* strict rule: forward packets coming from the best next hop only */ | |
544 | if (neigh_node != router) | |
545 | goto out; | |
546 | ||
547 | /* don't forward the same seqno twice on one interface */ | |
548 | if (orig_ifinfo->last_seqno_forwarded == ntohl(ogm_received->seqno)) | |
549 | goto out; | |
550 | ||
551 | orig_ifinfo->last_seqno_forwarded = ntohl(ogm_received->seqno); | |
552 | ||
9323158e AQ |
553 | if (ogm_received->ttl <= 1) { |
554 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n"); | |
efcc9d30 | 555 | goto out; |
9323158e AQ |
556 | } |
557 | ||
efcc9d30 SW |
558 | neigh_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing); |
559 | if (!neigh_ifinfo) | |
560 | goto out; | |
561 | ||
9323158e AQ |
562 | tvlv_len = ntohs(ogm_received->tvlv_len); |
563 | ||
564 | packet_len = BATADV_OGM2_HLEN + tvlv_len; | |
565 | skb = netdev_alloc_skb_ip_align(if_outgoing->net_dev, | |
566 | ETH_HLEN + packet_len); | |
567 | if (!skb) | |
efcc9d30 | 568 | goto out; |
9323158e AQ |
569 | |
570 | skb_reserve(skb, ETH_HLEN); | |
59ae1d12 | 571 | skb_buff = skb_put_data(skb, ogm_received, packet_len); |
9323158e AQ |
572 | |
573 | /* apply forward penalty */ | |
574 | ogm_forward = (struct batadv_ogm2_packet *)skb_buff; | |
efcc9d30 | 575 | ogm_forward->throughput = htonl(neigh_ifinfo->bat_v.throughput); |
9323158e AQ |
576 | ogm_forward->ttl--; |
577 | ||
578 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
579 | "Forwarding OGM2 packet on %s: throughput %u, ttl %u, received via %s\n", | |
efcc9d30 SW |
580 | if_outgoing->net_dev->name, ntohl(ogm_forward->throughput), |
581 | ogm_forward->ttl, if_incoming->net_dev->name); | |
9323158e | 582 | |
f89255a0 | 583 | batadv_v_ogm_queue_on_if(skb, if_outgoing); |
efcc9d30 SW |
584 | |
585 | out: | |
79a0bffb SE |
586 | batadv_orig_ifinfo_put(orig_ifinfo); |
587 | batadv_neigh_node_put(router); | |
588 | batadv_neigh_ifinfo_put(neigh_ifinfo); | |
9323158e AQ |
589 | } |
590 | ||
591 | /** | |
7e9a8c2c | 592 | * batadv_v_ogm_metric_update() - update route metric based on OGM |
9323158e AQ |
593 | * @bat_priv: the bat priv with all the soft interface information |
594 | * @ogm2: OGM2 structure | |
595 | * @orig_node: Originator structure for which the OGM has been received | |
596 | * @neigh_node: the neigh_node through with the OGM has been received | |
597 | * @if_incoming: the interface where this packet was received | |
598 | * @if_outgoing: the interface for which the packet should be considered | |
599 | * | |
600 | * Return: | |
601 | * 1 if the OGM is new, | |
602 | * 0 if it is not new but valid, | |
603 | * <0 on error (e.g. old OGM) | |
604 | */ | |
605 | static int batadv_v_ogm_metric_update(struct batadv_priv *bat_priv, | |
606 | const struct batadv_ogm2_packet *ogm2, | |
607 | struct batadv_orig_node *orig_node, | |
608 | struct batadv_neigh_node *neigh_node, | |
609 | struct batadv_hard_iface *if_incoming, | |
610 | struct batadv_hard_iface *if_outgoing) | |
611 | { | |
422d2f77 | 612 | struct batadv_orig_ifinfo *orig_ifinfo; |
9323158e AQ |
613 | struct batadv_neigh_ifinfo *neigh_ifinfo = NULL; |
614 | bool protection_started = false; | |
615 | int ret = -EINVAL; | |
616 | u32 path_throughput; | |
617 | s32 seq_diff; | |
618 | ||
619 | orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing); | |
620 | if (!orig_ifinfo) | |
621 | goto out; | |
622 | ||
623 | seq_diff = ntohl(ogm2->seqno) - orig_ifinfo->last_real_seqno; | |
624 | ||
625 | if (!hlist_empty(&orig_node->neigh_list) && | |
626 | batadv_window_protected(bat_priv, seq_diff, | |
627 | BATADV_OGM_MAX_AGE, | |
628 | &orig_ifinfo->batman_seqno_reset, | |
629 | &protection_started)) { | |
630 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
631 | "Drop packet: packet within window protection time from %pM\n", | |
632 | ogm2->orig); | |
633 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
634 | "Last reset: %ld, %ld\n", | |
635 | orig_ifinfo->batman_seqno_reset, jiffies); | |
636 | goto out; | |
637 | } | |
638 | ||
639 | /* drop packets with old seqnos, however accept the first packet after | |
640 | * a host has been rebooted. | |
641 | */ | |
825ffe1f | 642 | if (seq_diff < 0 && !protection_started) |
9323158e AQ |
643 | goto out; |
644 | ||
645 | neigh_node->last_seen = jiffies; | |
646 | ||
647 | orig_node->last_seen = jiffies; | |
648 | ||
649 | orig_ifinfo->last_real_seqno = ntohl(ogm2->seqno); | |
650 | orig_ifinfo->last_ttl = ogm2->ttl; | |
651 | ||
652 | neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing); | |
653 | if (!neigh_ifinfo) | |
654 | goto out; | |
655 | ||
656 | path_throughput = batadv_v_forward_penalty(bat_priv, if_incoming, | |
657 | if_outgoing, | |
658 | ntohl(ogm2->throughput)); | |
659 | neigh_ifinfo->bat_v.throughput = path_throughput; | |
660 | neigh_ifinfo->bat_v.last_seqno = ntohl(ogm2->seqno); | |
661 | neigh_ifinfo->last_ttl = ogm2->ttl; | |
662 | ||
663 | if (seq_diff > 0 || protection_started) | |
664 | ret = 1; | |
665 | else | |
666 | ret = 0; | |
667 | out: | |
79a0bffb SE |
668 | batadv_orig_ifinfo_put(orig_ifinfo); |
669 | batadv_neigh_ifinfo_put(neigh_ifinfo); | |
9323158e AQ |
670 | |
671 | return ret; | |
672 | } | |
673 | ||
674 | /** | |
7e9a8c2c | 675 | * batadv_v_ogm_route_update() - update routes based on OGM |
9323158e AQ |
676 | * @bat_priv: the bat priv with all the soft interface information |
677 | * @ethhdr: the Ethernet header of the OGM2 | |
678 | * @ogm2: OGM2 structure | |
679 | * @orig_node: Originator structure for which the OGM has been received | |
680 | * @neigh_node: the neigh_node through with the OGM has been received | |
681 | * @if_incoming: the interface where this packet was received | |
682 | * @if_outgoing: the interface for which the packet should be considered | |
efcc9d30 SW |
683 | * |
684 | * Return: true if the packet should be forwarded, false otherwise | |
9323158e | 685 | */ |
efcc9d30 | 686 | static bool batadv_v_ogm_route_update(struct batadv_priv *bat_priv, |
9323158e AQ |
687 | const struct ethhdr *ethhdr, |
688 | const struct batadv_ogm2_packet *ogm2, | |
689 | struct batadv_orig_node *orig_node, | |
690 | struct batadv_neigh_node *neigh_node, | |
691 | struct batadv_hard_iface *if_incoming, | |
692 | struct batadv_hard_iface *if_outgoing) | |
693 | { | |
694 | struct batadv_neigh_node *router = NULL; | |
422d2f77 | 695 | struct batadv_orig_node *orig_neigh_node; |
9323158e | 696 | struct batadv_neigh_node *orig_neigh_router = NULL; |
86de37c1 SW |
697 | struct batadv_neigh_ifinfo *router_ifinfo = NULL, *neigh_ifinfo = NULL; |
698 | u32 router_throughput, neigh_throughput; | |
699 | u32 router_last_seqno; | |
700 | u32 neigh_last_seqno; | |
701 | s32 neigh_seq_diff; | |
efcc9d30 | 702 | bool forward = false; |
9323158e AQ |
703 | |
704 | orig_neigh_node = batadv_v_ogm_orig_get(bat_priv, ethhdr->h_source); | |
705 | if (!orig_neigh_node) | |
706 | goto out; | |
707 | ||
708 | orig_neigh_router = batadv_orig_router_get(orig_neigh_node, | |
709 | if_outgoing); | |
710 | ||
711 | /* drop packet if sender is not a direct neighbor and if we | |
712 | * don't route towards it | |
713 | */ | |
714 | router = batadv_orig_router_get(orig_node, if_outgoing); | |
715 | if (router && router->orig_node != orig_node && !orig_neigh_router) { | |
716 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
717 | "Drop packet: OGM via unknown neighbor!\n"); | |
718 | goto out; | |
719 | } | |
720 | ||
86de37c1 SW |
721 | /* Mark the OGM to be considered for forwarding, and update routes |
722 | * if needed. | |
723 | */ | |
efcc9d30 | 724 | forward = true; |
86de37c1 SW |
725 | |
726 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
727 | "Searching and updating originator entry of received packet\n"); | |
728 | ||
729 | /* if this neighbor already is our next hop there is nothing | |
730 | * to change | |
731 | */ | |
732 | if (router == neigh_node) | |
733 | goto out; | |
734 | ||
735 | /* don't consider neighbours with worse throughput. | |
736 | * also switch route if this seqno is BATADV_V_MAX_ORIGDIFF newer than | |
737 | * the last received seqno from our best next hop. | |
738 | */ | |
739 | if (router) { | |
740 | router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing); | |
741 | neigh_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing); | |
742 | ||
743 | /* if these are not allocated, something is wrong. */ | |
744 | if (!router_ifinfo || !neigh_ifinfo) | |
745 | goto out; | |
746 | ||
747 | neigh_last_seqno = neigh_ifinfo->bat_v.last_seqno; | |
748 | router_last_seqno = router_ifinfo->bat_v.last_seqno; | |
749 | neigh_seq_diff = neigh_last_seqno - router_last_seqno; | |
750 | router_throughput = router_ifinfo->bat_v.throughput; | |
751 | neigh_throughput = neigh_ifinfo->bat_v.throughput; | |
752 | ||
825ffe1f SE |
753 | if (neigh_seq_diff < BATADV_OGM_MAX_ORIGDIFF && |
754 | router_throughput >= neigh_throughput) | |
86de37c1 SW |
755 | goto out; |
756 | } | |
757 | ||
758 | batadv_update_route(bat_priv, orig_node, if_outgoing, neigh_node); | |
9323158e | 759 | out: |
79a0bffb SE |
760 | batadv_neigh_node_put(router); |
761 | batadv_neigh_node_put(orig_neigh_router); | |
762 | batadv_orig_node_put(orig_neigh_node); | |
763 | batadv_neigh_ifinfo_put(router_ifinfo); | |
764 | batadv_neigh_ifinfo_put(neigh_ifinfo); | |
efcc9d30 SW |
765 | |
766 | return forward; | |
9323158e AQ |
767 | } |
768 | ||
769 | /** | |
7e9a8c2c | 770 | * batadv_v_ogm_process_per_outif() - process a batman v OGM for an outgoing if |
9323158e AQ |
771 | * @bat_priv: the bat priv with all the soft interface information |
772 | * @ethhdr: the Ethernet header of the OGM2 | |
773 | * @ogm2: OGM2 structure | |
774 | * @orig_node: Originator structure for which the OGM has been received | |
775 | * @neigh_node: the neigh_node through with the OGM has been received | |
776 | * @if_incoming: the interface where this packet was received | |
777 | * @if_outgoing: the interface for which the packet should be considered | |
778 | */ | |
779 | static void | |
780 | batadv_v_ogm_process_per_outif(struct batadv_priv *bat_priv, | |
781 | const struct ethhdr *ethhdr, | |
782 | const struct batadv_ogm2_packet *ogm2, | |
783 | struct batadv_orig_node *orig_node, | |
784 | struct batadv_neigh_node *neigh_node, | |
785 | struct batadv_hard_iface *if_incoming, | |
786 | struct batadv_hard_iface *if_outgoing) | |
787 | { | |
788 | int seqno_age; | |
efcc9d30 | 789 | bool forward; |
9323158e AQ |
790 | |
791 | /* first, update the metric with according sanity checks */ | |
792 | seqno_age = batadv_v_ogm_metric_update(bat_priv, ogm2, orig_node, | |
793 | neigh_node, if_incoming, | |
794 | if_outgoing); | |
795 | ||
796 | /* outdated sequence numbers are to be discarded */ | |
797 | if (seqno_age < 0) | |
798 | return; | |
799 | ||
800 | /* only unknown & newer OGMs contain TVLVs we are interested in */ | |
825ffe1f | 801 | if (seqno_age > 0 && if_outgoing == BATADV_IF_DEFAULT) |
0c4061c0 LL |
802 | batadv_tvlv_containers_process(bat_priv, BATADV_OGM2, orig_node, |
803 | NULL, | |
9323158e AQ |
804 | (unsigned char *)(ogm2 + 1), |
805 | ntohs(ogm2->tvlv_len)); | |
806 | ||
807 | /* if the metric update went through, update routes if needed */ | |
efcc9d30 SW |
808 | forward = batadv_v_ogm_route_update(bat_priv, ethhdr, ogm2, orig_node, |
809 | neigh_node, if_incoming, | |
810 | if_outgoing); | |
811 | ||
812 | /* if the routes have been processed correctly, check and forward */ | |
813 | if (forward) | |
814 | batadv_v_ogm_forward(bat_priv, ogm2, orig_node, neigh_node, | |
815 | if_incoming, if_outgoing); | |
9323158e AQ |
816 | } |
817 | ||
818 | /** | |
7e9a8c2c | 819 | * batadv_v_ogm_aggr_packet() - checks if there is another OGM aggregated |
9323158e AQ |
820 | * @buff_pos: current position in the skb |
821 | * @packet_len: total length of the skb | |
0ff0f15a | 822 | * @ogm2_packet: potential OGM2 in buffer |
9323158e AQ |
823 | * |
824 | * Return: true if there is enough space for another OGM, false otherwise. | |
825 | */ | |
0ff0f15a SE |
826 | static bool |
827 | batadv_v_ogm_aggr_packet(int buff_pos, int packet_len, | |
828 | const struct batadv_ogm2_packet *ogm2_packet) | |
9323158e AQ |
829 | { |
830 | int next_buff_pos = 0; | |
831 | ||
0ff0f15a SE |
832 | /* check if there is enough space for the header */ |
833 | next_buff_pos += buff_pos + sizeof(*ogm2_packet); | |
834 | if (next_buff_pos > packet_len) | |
835 | return false; | |
836 | ||
837 | /* check if there is enough space for the optional TVLV */ | |
838 | next_buff_pos += ntohs(ogm2_packet->tvlv_len); | |
9323158e AQ |
839 | |
840 | return (next_buff_pos <= packet_len) && | |
841 | (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES); | |
842 | } | |
843 | ||
844 | /** | |
7e9a8c2c | 845 | * batadv_v_ogm_process() - process an incoming batman v OGM |
9323158e AQ |
846 | * @skb: the skb containing the OGM |
847 | * @ogm_offset: offset to the OGM which should be processed (for aggregates) | |
bccb48c8 | 848 | * @if_incoming: the interface where this packet was received |
9323158e AQ |
849 | */ |
850 | static void batadv_v_ogm_process(const struct sk_buff *skb, int ogm_offset, | |
851 | struct batadv_hard_iface *if_incoming) | |
852 | { | |
853 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); | |
854 | struct ethhdr *ethhdr; | |
855 | struct batadv_orig_node *orig_node = NULL; | |
856 | struct batadv_hardif_neigh_node *hardif_neigh = NULL; | |
857 | struct batadv_neigh_node *neigh_node = NULL; | |
858 | struct batadv_hard_iface *hard_iface; | |
859 | struct batadv_ogm2_packet *ogm_packet; | |
860 | u32 ogm_throughput, link_throughput, path_throughput; | |
3111beed | 861 | int ret; |
9323158e AQ |
862 | |
863 | ethhdr = eth_hdr(skb); | |
864 | ogm_packet = (struct batadv_ogm2_packet *)(skb->data + ogm_offset); | |
865 | ||
866 | ogm_throughput = ntohl(ogm_packet->throughput); | |
867 | ||
868 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
f25cbb2a | 869 | "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 |
870 | ethhdr->h_source, if_incoming->net_dev->name, |
871 | if_incoming->net_dev->dev_addr, ogm_packet->orig, | |
872 | ntohl(ogm_packet->seqno), ogm_throughput, ogm_packet->ttl, | |
873 | ogm_packet->version, ntohs(ogm_packet->tvlv_len)); | |
874 | ||
d8bf0c01 LL |
875 | if (batadv_is_my_mac(bat_priv, ogm_packet->orig)) { |
876 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
877 | "Drop packet: originator packet from ourself\n"); | |
878 | return; | |
879 | } | |
880 | ||
f25cbb2a CIK |
881 | /* If the throughput metric is 0, immediately drop the packet. No need |
882 | * to create orig_node / neigh_node for an unusable route. | |
9323158e AQ |
883 | */ |
884 | if (ogm_throughput == 0) { | |
885 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
f25cbb2a | 886 | "Drop packet: originator packet with throughput metric of 0\n"); |
9323158e AQ |
887 | return; |
888 | } | |
889 | ||
890 | /* require ELP packets be to received from this neighbor first */ | |
891 | hardif_neigh = batadv_hardif_neigh_get(if_incoming, ethhdr->h_source); | |
892 | if (!hardif_neigh) { | |
893 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
894 | "Drop packet: OGM via unknown neighbor!\n"); | |
895 | goto out; | |
896 | } | |
897 | ||
898 | orig_node = batadv_v_ogm_orig_get(bat_priv, ogm_packet->orig); | |
899 | if (!orig_node) | |
6f91a3f7 | 900 | goto out; |
9323158e | 901 | |
6f0a6b5e ML |
902 | neigh_node = batadv_neigh_node_get_or_create(orig_node, if_incoming, |
903 | ethhdr->h_source); | |
9323158e AQ |
904 | if (!neigh_node) |
905 | goto out; | |
906 | ||
907 | /* Update the received throughput metric to match the link | |
908 | * characteristic: | |
909 | * - If this OGM traveled one hop so far (emitted by single hop | |
910 | * neighbor) the path throughput metric equals the link throughput. | |
911 | * - For OGMs traversing more than hop the path throughput metric is | |
912 | * the smaller of the path throughput and the link throughput. | |
913 | */ | |
914 | link_throughput = ewma_throughput_read(&hardif_neigh->bat_v.throughput); | |
915 | path_throughput = min_t(u32, link_throughput, ogm_throughput); | |
916 | ogm_packet->throughput = htonl(path_throughput); | |
917 | ||
918 | batadv_v_ogm_process_per_outif(bat_priv, ethhdr, ogm_packet, orig_node, | |
919 | neigh_node, if_incoming, | |
920 | BATADV_IF_DEFAULT); | |
921 | ||
922 | rcu_read_lock(); | |
923 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { | |
924 | if (hard_iface->if_status != BATADV_IF_ACTIVE) | |
925 | continue; | |
926 | ||
927 | if (hard_iface->soft_iface != bat_priv->soft_iface) | |
928 | continue; | |
929 | ||
27353446 SE |
930 | if (!kref_get_unless_zero(&hard_iface->refcount)) |
931 | continue; | |
932 | ||
3111beed LL |
933 | ret = batadv_hardif_no_broadcast(hard_iface, |
934 | ogm_packet->orig, | |
935 | hardif_neigh->orig); | |
936 | ||
937 | if (ret) { | |
938 | char *type; | |
939 | ||
940 | switch (ret) { | |
941 | case BATADV_HARDIF_BCAST_NORECIPIENT: | |
942 | type = "no neighbor"; | |
943 | break; | |
944 | case BATADV_HARDIF_BCAST_DUPFWD: | |
945 | type = "single neighbor is source"; | |
946 | break; | |
947 | case BATADV_HARDIF_BCAST_DUPORIG: | |
948 | type = "single neighbor is originator"; | |
949 | break; | |
950 | default: | |
951 | type = "unknown"; | |
952 | } | |
953 | ||
f25cbb2a | 954 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "OGM2 packet from %pM on %s suppressed: %s\n", |
3111beed LL |
955 | ogm_packet->orig, hard_iface->net_dev->name, |
956 | type); | |
957 | ||
958 | batadv_hardif_put(hard_iface); | |
959 | continue; | |
960 | } | |
961 | ||
9323158e AQ |
962 | batadv_v_ogm_process_per_outif(bat_priv, ethhdr, ogm_packet, |
963 | orig_node, neigh_node, | |
964 | if_incoming, hard_iface); | |
27353446 SE |
965 | |
966 | batadv_hardif_put(hard_iface); | |
9323158e AQ |
967 | } |
968 | rcu_read_unlock(); | |
969 | out: | |
79a0bffb SE |
970 | batadv_orig_node_put(orig_node); |
971 | batadv_neigh_node_put(neigh_node); | |
972 | batadv_hardif_neigh_put(hardif_neigh); | |
9323158e AQ |
973 | } |
974 | ||
0da00359 | 975 | /** |
7e9a8c2c | 976 | * batadv_v_ogm_packet_recv() - OGM2 receiving handler |
0da00359 AQ |
977 | * @skb: the received OGM |
978 | * @if_incoming: the interface where this OGM has been received | |
979 | * | |
980 | * Return: NET_RX_SUCCESS and consume the skb on success or returns NET_RX_DROP | |
981 | * (without freeing the skb) on failure | |
982 | */ | |
983 | int batadv_v_ogm_packet_recv(struct sk_buff *skb, | |
984 | struct batadv_hard_iface *if_incoming) | |
985 | { | |
986 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); | |
987 | struct batadv_ogm2_packet *ogm_packet; | |
988 | struct ethhdr *ethhdr = eth_hdr(skb); | |
9323158e AQ |
989 | int ogm_offset; |
990 | u8 *packet_pos; | |
991 | int ret = NET_RX_DROP; | |
0da00359 AQ |
992 | |
993 | /* did we receive a OGM2 packet on an interface that does not have | |
994 | * B.A.T.M.A.N. V enabled ? | |
995 | */ | |
29824a55 | 996 | if (strcmp(bat_priv->algo_ops->name, "BATMAN_V") != 0) |
b91a2543 | 997 | goto free_skb; |
0da00359 AQ |
998 | |
999 | if (!batadv_check_management_packet(skb, if_incoming, BATADV_OGM2_HLEN)) | |
b91a2543 | 1000 | goto free_skb; |
0da00359 AQ |
1001 | |
1002 | if (batadv_is_my_mac(bat_priv, ethhdr->h_source)) | |
b91a2543 | 1003 | goto free_skb; |
0da00359 | 1004 | |
0da00359 AQ |
1005 | batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX); |
1006 | batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES, | |
1007 | skb->len + ETH_HLEN); | |
1008 | ||
9323158e AQ |
1009 | ogm_offset = 0; |
1010 | ogm_packet = (struct batadv_ogm2_packet *)skb->data; | |
1011 | ||
1012 | while (batadv_v_ogm_aggr_packet(ogm_offset, skb_headlen(skb), | |
0ff0f15a | 1013 | ogm_packet)) { |
9323158e AQ |
1014 | batadv_v_ogm_process(skb, ogm_offset, if_incoming); |
1015 | ||
1016 | ogm_offset += BATADV_OGM2_HLEN; | |
1017 | ogm_offset += ntohs(ogm_packet->tvlv_len); | |
1018 | ||
1019 | packet_pos = skb->data + ogm_offset; | |
1020 | ogm_packet = (struct batadv_ogm2_packet *)packet_pos; | |
1021 | } | |
1022 | ||
1023 | ret = NET_RX_SUCCESS; | |
b91a2543 SE |
1024 | |
1025 | free_skb: | |
1026 | if (ret == NET_RX_SUCCESS) | |
1027 | consume_skb(skb); | |
1028 | else | |
1029 | kfree_skb(skb); | |
9323158e AQ |
1030 | |
1031 | return ret; | |
0da00359 AQ |
1032 | } |
1033 | ||
1034 | /** | |
7e9a8c2c | 1035 | * batadv_v_ogm_init() - initialise the OGM2 engine |
0da00359 AQ |
1036 | * @bat_priv: the bat priv with all the soft interface information |
1037 | * | |
1038 | * Return: 0 on success or a negative error code in case of failure | |
1039 | */ | |
1040 | int batadv_v_ogm_init(struct batadv_priv *bat_priv) | |
1041 | { | |
1042 | struct batadv_ogm2_packet *ogm_packet; | |
1043 | unsigned char *ogm_buff; | |
1044 | u32 random_seqno; | |
1045 | ||
1046 | bat_priv->bat_v.ogm_buff_len = BATADV_OGM2_HLEN; | |
1047 | ogm_buff = kzalloc(bat_priv->bat_v.ogm_buff_len, GFP_ATOMIC); | |
1048 | if (!ogm_buff) | |
1049 | return -ENOMEM; | |
1050 | ||
1051 | bat_priv->bat_v.ogm_buff = ogm_buff; | |
1052 | ogm_packet = (struct batadv_ogm2_packet *)ogm_buff; | |
1053 | ogm_packet->packet_type = BATADV_OGM2; | |
1054 | ogm_packet->version = BATADV_COMPAT_VERSION; | |
1055 | ogm_packet->ttl = BATADV_TTL; | |
1056 | ogm_packet->flags = BATADV_NO_FLAGS; | |
1057 | ogm_packet->throughput = htonl(BATADV_THROUGHPUT_MAX_VALUE); | |
1058 | ||
1059 | /* randomize initial seqno to avoid collision */ | |
1060 | get_random_bytes(&random_seqno, sizeof(random_seqno)); | |
1061 | atomic_set(&bat_priv->bat_v.ogm_seqno, random_seqno); | |
1062 | INIT_DELAYED_WORK(&bat_priv->bat_v.ogm_wq, batadv_v_ogm_send); | |
1063 | ||
a8d23cbb SE |
1064 | mutex_init(&bat_priv->bat_v.ogm_buff_mutex); |
1065 | ||
0da00359 AQ |
1066 | return 0; |
1067 | } | |
1068 | ||
1069 | /** | |
7e9a8c2c | 1070 | * batadv_v_ogm_free() - free OGM private resources |
0da00359 AQ |
1071 | * @bat_priv: the bat priv with all the soft interface information |
1072 | */ | |
1073 | void batadv_v_ogm_free(struct batadv_priv *bat_priv) | |
1074 | { | |
1075 | cancel_delayed_work_sync(&bat_priv->bat_v.ogm_wq); | |
1076 | ||
a8d23cbb SE |
1077 | mutex_lock(&bat_priv->bat_v.ogm_buff_mutex); |
1078 | ||
0da00359 AQ |
1079 | kfree(bat_priv->bat_v.ogm_buff); |
1080 | bat_priv->bat_v.ogm_buff = NULL; | |
1081 | bat_priv->bat_v.ogm_buff_len = 0; | |
a8d23cbb SE |
1082 | |
1083 | mutex_unlock(&bat_priv->bat_v.ogm_buff_mutex); | |
0da00359 | 1084 | } |