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ac79cbb9 | 1 | /* Copyright (C) 2011-2017 B.A.T.M.A.N. contributors: |
d6f94d91 LL |
2 | * |
3 | * Linus Lüssing, Marek Lindner | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of version 2 of the GNU General Public | |
7 | * License as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but | |
10 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | * General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, see <http://www.gnu.org/licenses/>. | |
16 | */ | |
17 | ||
18 | #include "bat_v_elp.h" | |
19 | #include "main.h" | |
20 | ||
21 | #include <linux/atomic.h> | |
d6289088 | 22 | #include <linux/bitops.h> |
d6f94d91 LL |
23 | #include <linux/byteorder/generic.h> |
24 | #include <linux/errno.h> | |
25 | #include <linux/etherdevice.h> | |
c833484e | 26 | #include <linux/ethtool.h> |
d6f94d91 LL |
27 | #include <linux/fs.h> |
28 | #include <linux/if_ether.h> | |
29 | #include <linux/jiffies.h> | |
30 | #include <linux/kernel.h> | |
c833484e | 31 | #include <linux/kref.h> |
d6f94d91 | 32 | #include <linux/netdevice.h> |
d6289088 | 33 | #include <linux/nl80211.h> |
d6f94d91 LL |
34 | #include <linux/random.h> |
35 | #include <linux/rculist.h> | |
36 | #include <linux/rcupdate.h> | |
c833484e | 37 | #include <linux/rtnetlink.h> |
d6f94d91 LL |
38 | #include <linux/skbuff.h> |
39 | #include <linux/stddef.h> | |
40 | #include <linux/string.h> | |
41 | #include <linux/types.h> | |
42 | #include <linux/workqueue.h> | |
c833484e | 43 | #include <net/cfg80211.h> |
d6f94d91 LL |
44 | |
45 | #include "bat_algo.h" | |
9323158e | 46 | #include "bat_v_ogm.h" |
d6f94d91 | 47 | #include "hard-interface.h" |
ba412080 | 48 | #include "log.h" |
162bd64c | 49 | #include "originator.h" |
d6f94d91 | 50 | #include "packet.h" |
162bd64c | 51 | #include "routing.h" |
d6f94d91 LL |
52 | #include "send.h" |
53 | ||
54 | /** | |
55 | * batadv_v_elp_start_timer - restart timer for ELP periodic work | |
56 | * @hard_iface: the interface for which the timer has to be reset | |
57 | */ | |
58 | static void batadv_v_elp_start_timer(struct batadv_hard_iface *hard_iface) | |
59 | { | |
60 | unsigned int msecs; | |
61 | ||
62 | msecs = atomic_read(&hard_iface->bat_v.elp_interval) - BATADV_JITTER; | |
63 | msecs += prandom_u32() % (2 * BATADV_JITTER); | |
64 | ||
65 | queue_delayed_work(batadv_event_workqueue, &hard_iface->bat_v.elp_wq, | |
66 | msecs_to_jiffies(msecs)); | |
67 | } | |
68 | ||
c833484e AQ |
69 | /** |
70 | * batadv_v_elp_get_throughput - get the throughput towards a neighbour | |
71 | * @neigh: the neighbour for which the throughput has to be obtained | |
72 | * | |
73 | * Return: The throughput towards the given neighbour in multiples of 100kpbs | |
74 | * (a value of '1' equals to 0.1Mbps, '10' equals 1Mbps, etc). | |
75 | */ | |
76 | static u32 batadv_v_elp_get_throughput(struct batadv_hardif_neigh_node *neigh) | |
77 | { | |
78 | struct batadv_hard_iface *hard_iface = neigh->if_incoming; | |
79 | struct ethtool_link_ksettings link_settings; | |
1942de1b | 80 | struct net_device *real_netdev; |
c833484e AQ |
81 | struct station_info sinfo; |
82 | u32 throughput; | |
83 | int ret; | |
84 | ||
85 | /* if the user specified a customised value for this interface, then | |
86 | * return it directly | |
87 | */ | |
88 | throughput = atomic_read(&hard_iface->bat_v.throughput_override); | |
89 | if (throughput != 0) | |
90 | return throughput; | |
91 | ||
92 | /* if this is a wireless device, then ask its throughput through | |
93 | * cfg80211 API | |
94 | */ | |
10b1bbb4 SE |
95 | if (batadv_is_wifi_hardif(hard_iface)) { |
96 | if (!batadv_is_cfg80211_hardif(hard_iface)) | |
f44a3ae9 ML |
97 | /* unsupported WiFi driver version */ |
98 | goto default_throughput; | |
c833484e | 99 | |
1942de1b ML |
100 | real_netdev = batadv_get_real_netdev(hard_iface->net_dev); |
101 | if (!real_netdev) | |
102 | goto default_throughput; | |
103 | ||
104 | ret = cfg80211_get_station(real_netdev, neigh->addr, &sinfo); | |
105 | ||
106 | dev_put(real_netdev); | |
f44a3ae9 ML |
107 | if (ret == -ENOENT) { |
108 | /* Node is not associated anymore! It would be | |
109 | * possible to delete this neighbor. For now set | |
110 | * the throughput metric to 0. | |
111 | */ | |
112 | return 0; | |
113 | } | |
3f3f8732 SE |
114 | if (ret) |
115 | goto default_throughput; | |
d6289088 SE |
116 | if (!(sinfo.filled & BIT(NL80211_STA_INFO_EXPECTED_THROUGHPUT))) |
117 | goto default_throughput; | |
3f3f8732 SE |
118 | |
119 | return sinfo.expected_throughput / 100; | |
c833484e AQ |
120 | } |
121 | ||
122 | /* if not a wifi interface, check if this device provides data via | |
123 | * ethtool (e.g. an Ethernet adapter) | |
124 | */ | |
125 | memset(&link_settings, 0, sizeof(link_settings)); | |
126 | rtnl_lock(); | |
127 | ret = __ethtool_get_link_ksettings(hard_iface->net_dev, &link_settings); | |
128 | rtnl_unlock(); | |
129 | if (ret == 0) { | |
130 | /* link characteristics might change over time */ | |
131 | if (link_settings.base.duplex == DUPLEX_FULL) | |
132 | hard_iface->bat_v.flags |= BATADV_FULL_DUPLEX; | |
133 | else | |
134 | hard_iface->bat_v.flags &= ~BATADV_FULL_DUPLEX; | |
135 | ||
136 | throughput = link_settings.base.speed; | |
137 | if (throughput && (throughput != SPEED_UNKNOWN)) | |
138 | return throughput * 10; | |
139 | } | |
140 | ||
141 | default_throughput: | |
142 | if (!(hard_iface->bat_v.flags & BATADV_WARNING_DEFAULT)) { | |
143 | batadv_info(hard_iface->soft_iface, | |
144 | "WiFi driver or ethtool info does not provide information about link speeds on interface %s, therefore defaulting to hardcoded throughput values of %u.%1u Mbps. Consider overriding the throughput manually or checking your driver.\n", | |
145 | hard_iface->net_dev->name, | |
146 | BATADV_THROUGHPUT_DEFAULT_VALUE / 10, | |
147 | BATADV_THROUGHPUT_DEFAULT_VALUE % 10); | |
148 | hard_iface->bat_v.flags |= BATADV_WARNING_DEFAULT; | |
149 | } | |
150 | ||
151 | /* if none of the above cases apply, return the base_throughput */ | |
152 | return BATADV_THROUGHPUT_DEFAULT_VALUE; | |
153 | } | |
154 | ||
155 | /** | |
156 | * batadv_v_elp_throughput_metric_update - worker updating the throughput metric | |
157 | * of a single hop neighbour | |
158 | * @work: the work queue item | |
159 | */ | |
160 | void batadv_v_elp_throughput_metric_update(struct work_struct *work) | |
161 | { | |
162 | struct batadv_hardif_neigh_node_bat_v *neigh_bat_v; | |
163 | struct batadv_hardif_neigh_node *neigh; | |
164 | ||
165 | neigh_bat_v = container_of(work, struct batadv_hardif_neigh_node_bat_v, | |
166 | metric_work); | |
167 | neigh = container_of(neigh_bat_v, struct batadv_hardif_neigh_node, | |
168 | bat_v); | |
169 | ||
170 | ewma_throughput_add(&neigh->bat_v.throughput, | |
171 | batadv_v_elp_get_throughput(neigh)); | |
172 | ||
173 | /* decrement refcounter to balance increment performed before scheduling | |
174 | * this task | |
175 | */ | |
176 | batadv_hardif_neigh_put(neigh); | |
177 | } | |
178 | ||
8d2d499e AQ |
179 | /** |
180 | * batadv_v_elp_wifi_neigh_probe - send link probing packets to a neighbour | |
181 | * @neigh: the neighbour to probe | |
182 | * | |
183 | * Sends a predefined number of unicast wifi packets to a given neighbour in | |
184 | * order to trigger the throughput estimation on this link by the RC algorithm. | |
185 | * Packets are sent only if there there is not enough payload unicast traffic | |
186 | * towards this neighbour.. | |
187 | * | |
188 | * Return: True on success and false in case of error during skb preparation. | |
189 | */ | |
190 | static bool | |
191 | batadv_v_elp_wifi_neigh_probe(struct batadv_hardif_neigh_node *neigh) | |
192 | { | |
193 | struct batadv_hard_iface *hard_iface = neigh->if_incoming; | |
194 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); | |
195 | unsigned long last_tx_diff; | |
196 | struct sk_buff *skb; | |
197 | int probe_len, i; | |
198 | int elp_skb_len; | |
199 | ||
200 | /* this probing routine is for Wifi neighbours only */ | |
10b1bbb4 | 201 | if (!batadv_is_wifi_hardif(hard_iface)) |
8d2d499e AQ |
202 | return true; |
203 | ||
204 | /* probe the neighbor only if no unicast packets have been sent | |
205 | * to it in the last 100 milliseconds: this is the rate control | |
206 | * algorithm sampling interval (minstrel). In this way, if not | |
207 | * enough traffic has been sent to the neighbor, batman-adv can | |
208 | * generate 2 probe packets and push the RC algorithm to perform | |
209 | * the sampling | |
210 | */ | |
211 | last_tx_diff = jiffies_to_msecs(jiffies - neigh->bat_v.last_unicast_tx); | |
212 | if (last_tx_diff <= BATADV_ELP_PROBE_MAX_TX_DIFF) | |
213 | return true; | |
214 | ||
215 | probe_len = max_t(int, sizeof(struct batadv_elp_packet), | |
216 | BATADV_ELP_MIN_PROBE_SIZE); | |
217 | ||
218 | for (i = 0; i < BATADV_ELP_PROBES_PER_NODE; i++) { | |
219 | elp_skb_len = hard_iface->bat_v.elp_skb->len; | |
220 | skb = skb_copy_expand(hard_iface->bat_v.elp_skb, 0, | |
221 | probe_len - elp_skb_len, | |
222 | GFP_ATOMIC); | |
223 | if (!skb) | |
224 | return false; | |
225 | ||
226 | /* Tell the skb to get as big as the allocated space (we want | |
227 | * the packet to be exactly of that size to make the link | |
228 | * throughput estimation effective. | |
229 | */ | |
230 | skb_put(skb, probe_len - hard_iface->bat_v.elp_skb->len); | |
231 | ||
232 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
233 | "Sending unicast (probe) ELP packet on interface %s to %pM\n", | |
234 | hard_iface->net_dev->name, neigh->addr); | |
235 | ||
236 | batadv_send_skb_packet(skb, hard_iface, neigh->addr); | |
237 | } | |
238 | ||
239 | return true; | |
240 | } | |
241 | ||
d6f94d91 LL |
242 | /** |
243 | * batadv_v_elp_periodic_work - ELP periodic task per interface | |
244 | * @work: work queue item | |
245 | * | |
246 | * Emits broadcast ELP message in regular intervals. | |
247 | */ | |
248 | static void batadv_v_elp_periodic_work(struct work_struct *work) | |
249 | { | |
c833484e | 250 | struct batadv_hardif_neigh_node *hardif_neigh; |
d6f94d91 LL |
251 | struct batadv_hard_iface *hard_iface; |
252 | struct batadv_hard_iface_bat_v *bat_v; | |
253 | struct batadv_elp_packet *elp_packet; | |
254 | struct batadv_priv *bat_priv; | |
255 | struct sk_buff *skb; | |
256 | u32 elp_interval; | |
257 | ||
258 | bat_v = container_of(work, struct batadv_hard_iface_bat_v, elp_wq.work); | |
259 | hard_iface = container_of(bat_v, struct batadv_hard_iface, bat_v); | |
260 | bat_priv = netdev_priv(hard_iface->soft_iface); | |
261 | ||
262 | if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING) | |
263 | goto out; | |
264 | ||
265 | /* we are in the process of shutting this interface down */ | |
266 | if ((hard_iface->if_status == BATADV_IF_NOT_IN_USE) || | |
267 | (hard_iface->if_status == BATADV_IF_TO_BE_REMOVED)) | |
268 | goto out; | |
269 | ||
270 | /* the interface was enabled but may not be ready yet */ | |
271 | if (hard_iface->if_status != BATADV_IF_ACTIVE) | |
272 | goto restart_timer; | |
273 | ||
274 | skb = skb_copy(hard_iface->bat_v.elp_skb, GFP_ATOMIC); | |
275 | if (!skb) | |
276 | goto restart_timer; | |
277 | ||
278 | elp_packet = (struct batadv_elp_packet *)skb->data; | |
279 | elp_packet->seqno = htonl(atomic_read(&hard_iface->bat_v.elp_seqno)); | |
280 | elp_interval = atomic_read(&hard_iface->bat_v.elp_interval); | |
281 | elp_packet->elp_interval = htonl(elp_interval); | |
282 | ||
283 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
284 | "Sending broadcast ELP packet on interface %s, seqno %u\n", | |
285 | hard_iface->net_dev->name, | |
286 | atomic_read(&hard_iface->bat_v.elp_seqno)); | |
287 | ||
95d39278 | 288 | batadv_send_broadcast_skb(skb, hard_iface); |
d6f94d91 LL |
289 | |
290 | atomic_inc(&hard_iface->bat_v.elp_seqno); | |
291 | ||
c833484e AQ |
292 | /* The throughput metric is updated on each sent packet. This way, if a |
293 | * node is dead and no longer sends packets, batman-adv is still able to | |
294 | * react timely to its death. | |
295 | * | |
296 | * The throughput metric is updated by following these steps: | |
297 | * 1) if the hard_iface is wifi => send a number of unicast ELPs for | |
298 | * probing/sampling to each neighbor | |
299 | * 2) update the throughput metric value of each neighbor (note that the | |
300 | * value retrieved in this step might be 100ms old because the | |
301 | * probing packets at point 1) could still be in the HW queue) | |
302 | */ | |
303 | rcu_read_lock(); | |
304 | hlist_for_each_entry_rcu(hardif_neigh, &hard_iface->neigh_list, list) { | |
8d2d499e AQ |
305 | if (!batadv_v_elp_wifi_neigh_probe(hardif_neigh)) |
306 | /* if something goes wrong while probing, better to stop | |
307 | * sending packets immediately and reschedule the task | |
308 | */ | |
309 | break; | |
310 | ||
c833484e AQ |
311 | if (!kref_get_unless_zero(&hardif_neigh->refcount)) |
312 | continue; | |
313 | ||
314 | /* Reading the estimated throughput from cfg80211 is a task that | |
315 | * may sleep and that is not allowed in an rcu protected | |
316 | * context. Therefore schedule a task for that. | |
317 | */ | |
318 | queue_work(batadv_event_workqueue, | |
319 | &hardif_neigh->bat_v.metric_work); | |
320 | } | |
321 | rcu_read_unlock(); | |
322 | ||
d6f94d91 LL |
323 | restart_timer: |
324 | batadv_v_elp_start_timer(hard_iface); | |
325 | out: | |
326 | return; | |
327 | } | |
328 | ||
329 | /** | |
330 | * batadv_v_elp_iface_enable - setup the ELP interface private resources | |
331 | * @hard_iface: interface for which the data has to be prepared | |
332 | * | |
333 | * Return: 0 on success or a -ENOMEM in case of failure. | |
334 | */ | |
335 | int batadv_v_elp_iface_enable(struct batadv_hard_iface *hard_iface) | |
336 | { | |
337 | struct batadv_elp_packet *elp_packet; | |
338 | unsigned char *elp_buff; | |
339 | u32 random_seqno; | |
340 | size_t size; | |
341 | int res = -ENOMEM; | |
342 | ||
343 | size = ETH_HLEN + NET_IP_ALIGN + BATADV_ELP_HLEN; | |
344 | hard_iface->bat_v.elp_skb = dev_alloc_skb(size); | |
345 | if (!hard_iface->bat_v.elp_skb) | |
346 | goto out; | |
347 | ||
348 | skb_reserve(hard_iface->bat_v.elp_skb, ETH_HLEN + NET_IP_ALIGN); | |
b080db58 | 349 | elp_buff = skb_put_zero(hard_iface->bat_v.elp_skb, BATADV_ELP_HLEN); |
d6f94d91 | 350 | elp_packet = (struct batadv_elp_packet *)elp_buff; |
d6f94d91 LL |
351 | |
352 | elp_packet->packet_type = BATADV_ELP; | |
353 | elp_packet->version = BATADV_COMPAT_VERSION; | |
354 | ||
355 | /* randomize initial seqno to avoid collision */ | |
356 | get_random_bytes(&random_seqno, sizeof(random_seqno)); | |
357 | atomic_set(&hard_iface->bat_v.elp_seqno, random_seqno); | |
d6f94d91 | 358 | |
c833484e AQ |
359 | /* assume full-duplex by default */ |
360 | hard_iface->bat_v.flags |= BATADV_FULL_DUPLEX; | |
361 | ||
362 | /* warn the user (again) if there is no throughput data is available */ | |
363 | hard_iface->bat_v.flags &= ~BATADV_WARNING_DEFAULT; | |
364 | ||
10b1bbb4 | 365 | if (batadv_is_wifi_hardif(hard_iface)) |
c833484e AQ |
366 | hard_iface->bat_v.flags &= ~BATADV_FULL_DUPLEX; |
367 | ||
d6f94d91 LL |
368 | INIT_DELAYED_WORK(&hard_iface->bat_v.elp_wq, |
369 | batadv_v_elp_periodic_work); | |
370 | batadv_v_elp_start_timer(hard_iface); | |
371 | res = 0; | |
372 | ||
373 | out: | |
374 | return res; | |
375 | } | |
376 | ||
377 | /** | |
378 | * batadv_v_elp_iface_disable - release ELP interface private resources | |
379 | * @hard_iface: interface for which the resources have to be released | |
380 | */ | |
381 | void batadv_v_elp_iface_disable(struct batadv_hard_iface *hard_iface) | |
382 | { | |
383 | cancel_delayed_work_sync(&hard_iface->bat_v.elp_wq); | |
384 | ||
385 | dev_kfree_skb(hard_iface->bat_v.elp_skb); | |
386 | hard_iface->bat_v.elp_skb = NULL; | |
387 | } | |
388 | ||
ebe24cea ML |
389 | /** |
390 | * batadv_v_elp_iface_activate - update the ELP buffer belonging to the given | |
391 | * hard-interface | |
392 | * @primary_iface: the new primary interface | |
393 | * @hard_iface: interface holding the to-be-updated buffer | |
394 | */ | |
395 | void batadv_v_elp_iface_activate(struct batadv_hard_iface *primary_iface, | |
396 | struct batadv_hard_iface *hard_iface) | |
397 | { | |
398 | struct batadv_elp_packet *elp_packet; | |
399 | struct sk_buff *skb; | |
400 | ||
401 | if (!hard_iface->bat_v.elp_skb) | |
402 | return; | |
403 | ||
404 | skb = hard_iface->bat_v.elp_skb; | |
405 | elp_packet = (struct batadv_elp_packet *)skb->data; | |
406 | ether_addr_copy(elp_packet->orig, | |
407 | primary_iface->net_dev->dev_addr); | |
408 | } | |
409 | ||
d6f94d91 LL |
410 | /** |
411 | * batadv_v_elp_primary_iface_set - change internal data to reflect the new | |
412 | * primary interface | |
413 | * @primary_iface: the new primary interface | |
414 | */ | |
415 | void batadv_v_elp_primary_iface_set(struct batadv_hard_iface *primary_iface) | |
416 | { | |
417 | struct batadv_hard_iface *hard_iface; | |
d6f94d91 LL |
418 | |
419 | /* update orig field of every elp iface belonging to this mesh */ | |
420 | rcu_read_lock(); | |
421 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { | |
422 | if (primary_iface->soft_iface != hard_iface->soft_iface) | |
423 | continue; | |
424 | ||
ebe24cea | 425 | batadv_v_elp_iface_activate(primary_iface, hard_iface); |
d6f94d91 LL |
426 | } |
427 | rcu_read_unlock(); | |
428 | } | |
162bd64c | 429 | |
162bd64c LL |
430 | /** |
431 | * batadv_v_elp_neigh_update - update an ELP neighbour node | |
432 | * @bat_priv: the bat priv with all the soft interface information | |
433 | * @neigh_addr: the neighbour interface address | |
434 | * @if_incoming: the interface the packet was received through | |
435 | * @elp_packet: the received ELP packet | |
436 | * | |
437 | * Updates the ELP neighbour node state with the data received within the new | |
438 | * ELP packet. | |
439 | */ | |
440 | static void batadv_v_elp_neigh_update(struct batadv_priv *bat_priv, | |
441 | u8 *neigh_addr, | |
442 | struct batadv_hard_iface *if_incoming, | |
443 | struct batadv_elp_packet *elp_packet) | |
444 | ||
445 | { | |
446 | struct batadv_neigh_node *neigh; | |
447 | struct batadv_orig_node *orig_neigh; | |
448 | struct batadv_hardif_neigh_node *hardif_neigh; | |
449 | s32 seqno_diff; | |
450 | s32 elp_latest_seqno; | |
451 | ||
452 | orig_neigh = batadv_v_ogm_orig_get(bat_priv, elp_packet->orig); | |
453 | if (!orig_neigh) | |
454 | return; | |
455 | ||
6f0a6b5e ML |
456 | neigh = batadv_neigh_node_get_or_create(orig_neigh, |
457 | if_incoming, neigh_addr); | |
162bd64c LL |
458 | if (!neigh) |
459 | goto orig_free; | |
460 | ||
461 | hardif_neigh = batadv_hardif_neigh_get(if_incoming, neigh_addr); | |
462 | if (!hardif_neigh) | |
463 | goto neigh_free; | |
464 | ||
465 | elp_latest_seqno = hardif_neigh->bat_v.elp_latest_seqno; | |
466 | seqno_diff = ntohl(elp_packet->seqno) - elp_latest_seqno; | |
467 | ||
468 | /* known or older sequence numbers are ignored. However always adopt | |
469 | * if the router seems to have been restarted. | |
470 | */ | |
471 | if (seqno_diff < 1 && seqno_diff > -BATADV_ELP_MAX_AGE) | |
472 | goto hardif_free; | |
473 | ||
474 | neigh->last_seen = jiffies; | |
475 | hardif_neigh->last_seen = jiffies; | |
476 | hardif_neigh->bat_v.elp_latest_seqno = ntohl(elp_packet->seqno); | |
477 | hardif_neigh->bat_v.elp_interval = ntohl(elp_packet->elp_interval); | |
478 | ||
479 | hardif_free: | |
480 | if (hardif_neigh) | |
481 | batadv_hardif_neigh_put(hardif_neigh); | |
482 | neigh_free: | |
483 | if (neigh) | |
484 | batadv_neigh_node_put(neigh); | |
485 | orig_free: | |
486 | if (orig_neigh) | |
487 | batadv_orig_node_put(orig_neigh); | |
488 | } | |
489 | ||
490 | /** | |
491 | * batadv_v_elp_packet_recv - main ELP packet handler | |
492 | * @skb: the received packet | |
493 | * @if_incoming: the interface this packet was received through | |
494 | * | |
495 | * Return: NET_RX_SUCCESS and consumes the skb if the packet was peoperly | |
496 | * processed or NET_RX_DROP in case of failure. | |
497 | */ | |
498 | int batadv_v_elp_packet_recv(struct sk_buff *skb, | |
499 | struct batadv_hard_iface *if_incoming) | |
500 | { | |
501 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); | |
502 | struct batadv_elp_packet *elp_packet; | |
503 | struct batadv_hard_iface *primary_if; | |
504 | struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
b91a2543 SE |
505 | bool res; |
506 | int ret = NET_RX_DROP; | |
162bd64c | 507 | |
b91a2543 SE |
508 | res = batadv_check_management_packet(skb, if_incoming, BATADV_ELP_HLEN); |
509 | if (!res) | |
510 | goto free_skb; | |
162bd64c LL |
511 | |
512 | if (batadv_is_my_mac(bat_priv, ethhdr->h_source)) | |
b91a2543 | 513 | goto free_skb; |
162bd64c LL |
514 | |
515 | /* did we receive a B.A.T.M.A.N. V ELP packet on an interface | |
516 | * that does not have B.A.T.M.A.N. V ELP enabled ? | |
517 | */ | |
29824a55 | 518 | if (strcmp(bat_priv->algo_ops->name, "BATMAN_V") != 0) |
b91a2543 | 519 | goto free_skb; |
162bd64c LL |
520 | |
521 | elp_packet = (struct batadv_elp_packet *)skb->data; | |
522 | ||
523 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
524 | "Received ELP packet from %pM seqno %u ORIG: %pM\n", | |
525 | ethhdr->h_source, ntohl(elp_packet->seqno), | |
526 | elp_packet->orig); | |
527 | ||
528 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
529 | if (!primary_if) | |
b91a2543 | 530 | goto free_skb; |
162bd64c LL |
531 | |
532 | batadv_v_elp_neigh_update(bat_priv, ethhdr->h_source, if_incoming, | |
533 | elp_packet); | |
534 | ||
b91a2543 SE |
535 | ret = NET_RX_SUCCESS; |
536 | batadv_hardif_put(primary_if); | |
537 | ||
538 | free_skb: | |
539 | if (ret == NET_RX_SUCCESS) | |
540 | consume_skb(skb); | |
541 | else | |
542 | kfree_skb(skb); | |
543 | ||
544 | return ret; | |
162bd64c | 545 | } |