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7db7d9f3 | 1 | // SPDX-License-Identifier: GPL-2.0 |
6b1aea8c | 2 | /* Copyright (C) 2011-2018 B.A.T.M.A.N. contributors: |
d6f94d91 LL |
3 | * |
4 | * Linus Lüssing, Marek Lindner | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of version 2 of the GNU General Public | |
8 | * License as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, see <http://www.gnu.org/licenses/>. | |
17 | */ | |
18 | ||
19 | #include "bat_v_elp.h" | |
20 | #include "main.h" | |
21 | ||
22 | #include <linux/atomic.h> | |
d6289088 | 23 | #include <linux/bitops.h> |
d6f94d91 LL |
24 | #include <linux/byteorder/generic.h> |
25 | #include <linux/errno.h> | |
26 | #include <linux/etherdevice.h> | |
c833484e | 27 | #include <linux/ethtool.h> |
b92b94ac | 28 | #include <linux/gfp.h> |
d6f94d91 LL |
29 | #include <linux/if_ether.h> |
30 | #include <linux/jiffies.h> | |
31 | #include <linux/kernel.h> | |
c833484e | 32 | #include <linux/kref.h> |
d6f94d91 | 33 | #include <linux/netdevice.h> |
d6289088 | 34 | #include <linux/nl80211.h> |
d6f94d91 LL |
35 | #include <linux/random.h> |
36 | #include <linux/rculist.h> | |
37 | #include <linux/rcupdate.h> | |
c833484e | 38 | #include <linux/rtnetlink.h> |
d6f94d91 LL |
39 | #include <linux/skbuff.h> |
40 | #include <linux/stddef.h> | |
41 | #include <linux/string.h> | |
42 | #include <linux/types.h> | |
43 | #include <linux/workqueue.h> | |
c833484e | 44 | #include <net/cfg80211.h> |
fec149f5 | 45 | #include <uapi/linux/batadv_packet.h> |
d6f94d91 LL |
46 | |
47 | #include "bat_algo.h" | |
9323158e | 48 | #include "bat_v_ogm.h" |
d6f94d91 | 49 | #include "hard-interface.h" |
ba412080 | 50 | #include "log.h" |
162bd64c | 51 | #include "originator.h" |
162bd64c | 52 | #include "routing.h" |
d6f94d91 LL |
53 | #include "send.h" |
54 | ||
55 | /** | |
7e9a8c2c | 56 | * batadv_v_elp_start_timer() - restart timer for ELP periodic work |
d6f94d91 LL |
57 | * @hard_iface: the interface for which the timer has to be reset |
58 | */ | |
59 | static void batadv_v_elp_start_timer(struct batadv_hard_iface *hard_iface) | |
60 | { | |
61 | unsigned int msecs; | |
62 | ||
63 | msecs = atomic_read(&hard_iface->bat_v.elp_interval) - BATADV_JITTER; | |
64 | msecs += prandom_u32() % (2 * BATADV_JITTER); | |
65 | ||
66 | queue_delayed_work(batadv_event_workqueue, &hard_iface->bat_v.elp_wq, | |
67 | msecs_to_jiffies(msecs)); | |
68 | } | |
69 | ||
c833484e | 70 | /** |
7e9a8c2c | 71 | * batadv_v_elp_get_throughput() - get the throughput towards a neighbour |
c833484e AQ |
72 | * @neigh: the neighbour for which the throughput has to be obtained |
73 | * | |
74 | * Return: The throughput towards the given neighbour in multiples of 100kpbs | |
75 | * (a value of '1' equals to 0.1Mbps, '10' equals 1Mbps, etc). | |
76 | */ | |
77 | static u32 batadv_v_elp_get_throughput(struct batadv_hardif_neigh_node *neigh) | |
78 | { | |
79 | struct batadv_hard_iface *hard_iface = neigh->if_incoming; | |
80 | struct ethtool_link_ksettings link_settings; | |
1942de1b | 81 | struct net_device *real_netdev; |
c833484e AQ |
82 | struct station_info sinfo; |
83 | u32 throughput; | |
84 | int ret; | |
85 | ||
86 | /* if the user specified a customised value for this interface, then | |
87 | * return it directly | |
88 | */ | |
89 | throughput = atomic_read(&hard_iface->bat_v.throughput_override); | |
90 | if (throughput != 0) | |
91 | return throughput; | |
92 | ||
93 | /* if this is a wireless device, then ask its throughput through | |
94 | * cfg80211 API | |
95 | */ | |
10b1bbb4 SE |
96 | if (batadv_is_wifi_hardif(hard_iface)) { |
97 | if (!batadv_is_cfg80211_hardif(hard_iface)) | |
f44a3ae9 ML |
98 | /* unsupported WiFi driver version */ |
99 | goto default_throughput; | |
c833484e | 100 | |
1942de1b ML |
101 | real_netdev = batadv_get_real_netdev(hard_iface->net_dev); |
102 | if (!real_netdev) | |
103 | goto default_throughput; | |
104 | ||
105 | ret = cfg80211_get_station(real_netdev, neigh->addr, &sinfo); | |
106 | ||
107 | dev_put(real_netdev); | |
f44a3ae9 ML |
108 | if (ret == -ENOENT) { |
109 | /* Node is not associated anymore! It would be | |
110 | * possible to delete this neighbor. For now set | |
111 | * the throughput metric to 0. | |
112 | */ | |
113 | return 0; | |
114 | } | |
3f3f8732 SE |
115 | if (ret) |
116 | goto default_throughput; | |
d6289088 SE |
117 | if (!(sinfo.filled & BIT(NL80211_STA_INFO_EXPECTED_THROUGHPUT))) |
118 | goto default_throughput; | |
3f3f8732 SE |
119 | |
120 | return sinfo.expected_throughput / 100; | |
c833484e AQ |
121 | } |
122 | ||
123 | /* if not a wifi interface, check if this device provides data via | |
124 | * ethtool (e.g. an Ethernet adapter) | |
125 | */ | |
126 | memset(&link_settings, 0, sizeof(link_settings)); | |
127 | rtnl_lock(); | |
128 | ret = __ethtool_get_link_ksettings(hard_iface->net_dev, &link_settings); | |
129 | rtnl_unlock(); | |
8c46fcd7 ML |
130 | |
131 | /* Virtual interface drivers such as tun / tap interfaces, VLAN, etc | |
132 | * tend to initialize the interface throughput with some value for the | |
133 | * sake of having a throughput number to export via ethtool. This | |
134 | * exported throughput leaves batman-adv to conclude the interface | |
135 | * throughput is genuine (reflecting reality), thus no measurements | |
136 | * are necessary. | |
137 | * | |
138 | * Based on the observation that those interface types also tend to set | |
139 | * the link auto-negotiation to 'off', batman-adv shall check this | |
140 | * setting to differentiate between genuine link throughput information | |
141 | * and placeholders installed by virtual interfaces. | |
142 | */ | |
143 | if (ret == 0 && link_settings.base.autoneg == AUTONEG_ENABLE) { | |
c833484e AQ |
144 | /* link characteristics might change over time */ |
145 | if (link_settings.base.duplex == DUPLEX_FULL) | |
146 | hard_iface->bat_v.flags |= BATADV_FULL_DUPLEX; | |
147 | else | |
148 | hard_iface->bat_v.flags &= ~BATADV_FULL_DUPLEX; | |
149 | ||
150 | throughput = link_settings.base.speed; | |
825ffe1f | 151 | if (throughput && throughput != SPEED_UNKNOWN) |
c833484e AQ |
152 | return throughput * 10; |
153 | } | |
154 | ||
155 | default_throughput: | |
156 | if (!(hard_iface->bat_v.flags & BATADV_WARNING_DEFAULT)) { | |
157 | batadv_info(hard_iface->soft_iface, | |
158 | "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", | |
159 | hard_iface->net_dev->name, | |
160 | BATADV_THROUGHPUT_DEFAULT_VALUE / 10, | |
161 | BATADV_THROUGHPUT_DEFAULT_VALUE % 10); | |
162 | hard_iface->bat_v.flags |= BATADV_WARNING_DEFAULT; | |
163 | } | |
164 | ||
165 | /* if none of the above cases apply, return the base_throughput */ | |
166 | return BATADV_THROUGHPUT_DEFAULT_VALUE; | |
167 | } | |
168 | ||
169 | /** | |
7e9a8c2c SE |
170 | * batadv_v_elp_throughput_metric_update() - worker updating the throughput |
171 | * metric of a single hop neighbour | |
c833484e AQ |
172 | * @work: the work queue item |
173 | */ | |
174 | void batadv_v_elp_throughput_metric_update(struct work_struct *work) | |
175 | { | |
176 | struct batadv_hardif_neigh_node_bat_v *neigh_bat_v; | |
177 | struct batadv_hardif_neigh_node *neigh; | |
178 | ||
179 | neigh_bat_v = container_of(work, struct batadv_hardif_neigh_node_bat_v, | |
180 | metric_work); | |
181 | neigh = container_of(neigh_bat_v, struct batadv_hardif_neigh_node, | |
182 | bat_v); | |
183 | ||
184 | ewma_throughput_add(&neigh->bat_v.throughput, | |
185 | batadv_v_elp_get_throughput(neigh)); | |
186 | ||
187 | /* decrement refcounter to balance increment performed before scheduling | |
188 | * this task | |
189 | */ | |
190 | batadv_hardif_neigh_put(neigh); | |
191 | } | |
192 | ||
8d2d499e | 193 | /** |
7e9a8c2c | 194 | * batadv_v_elp_wifi_neigh_probe() - send link probing packets to a neighbour |
8d2d499e AQ |
195 | * @neigh: the neighbour to probe |
196 | * | |
197 | * Sends a predefined number of unicast wifi packets to a given neighbour in | |
198 | * order to trigger the throughput estimation on this link by the RC algorithm. | |
199 | * Packets are sent only if there there is not enough payload unicast traffic | |
200 | * towards this neighbour.. | |
201 | * | |
202 | * Return: True on success and false in case of error during skb preparation. | |
203 | */ | |
204 | static bool | |
205 | batadv_v_elp_wifi_neigh_probe(struct batadv_hardif_neigh_node *neigh) | |
206 | { | |
207 | struct batadv_hard_iface *hard_iface = neigh->if_incoming; | |
208 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); | |
209 | unsigned long last_tx_diff; | |
210 | struct sk_buff *skb; | |
211 | int probe_len, i; | |
212 | int elp_skb_len; | |
213 | ||
214 | /* this probing routine is for Wifi neighbours only */ | |
10b1bbb4 | 215 | if (!batadv_is_wifi_hardif(hard_iface)) |
8d2d499e AQ |
216 | return true; |
217 | ||
218 | /* probe the neighbor only if no unicast packets have been sent | |
219 | * to it in the last 100 milliseconds: this is the rate control | |
220 | * algorithm sampling interval (minstrel). In this way, if not | |
221 | * enough traffic has been sent to the neighbor, batman-adv can | |
222 | * generate 2 probe packets and push the RC algorithm to perform | |
223 | * the sampling | |
224 | */ | |
225 | last_tx_diff = jiffies_to_msecs(jiffies - neigh->bat_v.last_unicast_tx); | |
226 | if (last_tx_diff <= BATADV_ELP_PROBE_MAX_TX_DIFF) | |
227 | return true; | |
228 | ||
229 | probe_len = max_t(int, sizeof(struct batadv_elp_packet), | |
230 | BATADV_ELP_MIN_PROBE_SIZE); | |
231 | ||
232 | for (i = 0; i < BATADV_ELP_PROBES_PER_NODE; i++) { | |
233 | elp_skb_len = hard_iface->bat_v.elp_skb->len; | |
234 | skb = skb_copy_expand(hard_iface->bat_v.elp_skb, 0, | |
235 | probe_len - elp_skb_len, | |
236 | GFP_ATOMIC); | |
237 | if (!skb) | |
238 | return false; | |
239 | ||
240 | /* Tell the skb to get as big as the allocated space (we want | |
241 | * the packet to be exactly of that size to make the link | |
242 | * throughput estimation effective. | |
243 | */ | |
244 | skb_put(skb, probe_len - hard_iface->bat_v.elp_skb->len); | |
245 | ||
246 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
247 | "Sending unicast (probe) ELP packet on interface %s to %pM\n", | |
248 | hard_iface->net_dev->name, neigh->addr); | |
249 | ||
250 | batadv_send_skb_packet(skb, hard_iface, neigh->addr); | |
251 | } | |
252 | ||
253 | return true; | |
254 | } | |
255 | ||
d6f94d91 | 256 | /** |
7e9a8c2c | 257 | * batadv_v_elp_periodic_work() - ELP periodic task per interface |
d6f94d91 LL |
258 | * @work: work queue item |
259 | * | |
260 | * Emits broadcast ELP message in regular intervals. | |
261 | */ | |
262 | static void batadv_v_elp_periodic_work(struct work_struct *work) | |
263 | { | |
c833484e | 264 | struct batadv_hardif_neigh_node *hardif_neigh; |
d6f94d91 LL |
265 | struct batadv_hard_iface *hard_iface; |
266 | struct batadv_hard_iface_bat_v *bat_v; | |
267 | struct batadv_elp_packet *elp_packet; | |
268 | struct batadv_priv *bat_priv; | |
269 | struct sk_buff *skb; | |
270 | u32 elp_interval; | |
271 | ||
272 | bat_v = container_of(work, struct batadv_hard_iface_bat_v, elp_wq.work); | |
273 | hard_iface = container_of(bat_v, struct batadv_hard_iface, bat_v); | |
274 | bat_priv = netdev_priv(hard_iface->soft_iface); | |
275 | ||
276 | if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING) | |
277 | goto out; | |
278 | ||
279 | /* we are in the process of shutting this interface down */ | |
825ffe1f SE |
280 | if (hard_iface->if_status == BATADV_IF_NOT_IN_USE || |
281 | hard_iface->if_status == BATADV_IF_TO_BE_REMOVED) | |
d6f94d91 LL |
282 | goto out; |
283 | ||
284 | /* the interface was enabled but may not be ready yet */ | |
285 | if (hard_iface->if_status != BATADV_IF_ACTIVE) | |
286 | goto restart_timer; | |
287 | ||
288 | skb = skb_copy(hard_iface->bat_v.elp_skb, GFP_ATOMIC); | |
289 | if (!skb) | |
290 | goto restart_timer; | |
291 | ||
292 | elp_packet = (struct batadv_elp_packet *)skb->data; | |
293 | elp_packet->seqno = htonl(atomic_read(&hard_iface->bat_v.elp_seqno)); | |
294 | elp_interval = atomic_read(&hard_iface->bat_v.elp_interval); | |
295 | elp_packet->elp_interval = htonl(elp_interval); | |
296 | ||
297 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
298 | "Sending broadcast ELP packet on interface %s, seqno %u\n", | |
299 | hard_iface->net_dev->name, | |
300 | atomic_read(&hard_iface->bat_v.elp_seqno)); | |
301 | ||
95d39278 | 302 | batadv_send_broadcast_skb(skb, hard_iface); |
d6f94d91 LL |
303 | |
304 | atomic_inc(&hard_iface->bat_v.elp_seqno); | |
305 | ||
c833484e AQ |
306 | /* The throughput metric is updated on each sent packet. This way, if a |
307 | * node is dead and no longer sends packets, batman-adv is still able to | |
308 | * react timely to its death. | |
309 | * | |
310 | * The throughput metric is updated by following these steps: | |
311 | * 1) if the hard_iface is wifi => send a number of unicast ELPs for | |
312 | * probing/sampling to each neighbor | |
313 | * 2) update the throughput metric value of each neighbor (note that the | |
314 | * value retrieved in this step might be 100ms old because the | |
315 | * probing packets at point 1) could still be in the HW queue) | |
316 | */ | |
317 | rcu_read_lock(); | |
318 | hlist_for_each_entry_rcu(hardif_neigh, &hard_iface->neigh_list, list) { | |
8d2d499e AQ |
319 | if (!batadv_v_elp_wifi_neigh_probe(hardif_neigh)) |
320 | /* if something goes wrong while probing, better to stop | |
321 | * sending packets immediately and reschedule the task | |
322 | */ | |
323 | break; | |
324 | ||
c833484e AQ |
325 | if (!kref_get_unless_zero(&hardif_neigh->refcount)) |
326 | continue; | |
327 | ||
328 | /* Reading the estimated throughput from cfg80211 is a task that | |
329 | * may sleep and that is not allowed in an rcu protected | |
330 | * context. Therefore schedule a task for that. | |
331 | */ | |
332 | queue_work(batadv_event_workqueue, | |
333 | &hardif_neigh->bat_v.metric_work); | |
334 | } | |
335 | rcu_read_unlock(); | |
336 | ||
d6f94d91 LL |
337 | restart_timer: |
338 | batadv_v_elp_start_timer(hard_iface); | |
339 | out: | |
340 | return; | |
341 | } | |
342 | ||
343 | /** | |
7e9a8c2c | 344 | * batadv_v_elp_iface_enable() - setup the ELP interface private resources |
d6f94d91 LL |
345 | * @hard_iface: interface for which the data has to be prepared |
346 | * | |
347 | * Return: 0 on success or a -ENOMEM in case of failure. | |
348 | */ | |
349 | int batadv_v_elp_iface_enable(struct batadv_hard_iface *hard_iface) | |
350 | { | |
351 | struct batadv_elp_packet *elp_packet; | |
352 | unsigned char *elp_buff; | |
353 | u32 random_seqno; | |
354 | size_t size; | |
355 | int res = -ENOMEM; | |
356 | ||
357 | size = ETH_HLEN + NET_IP_ALIGN + BATADV_ELP_HLEN; | |
358 | hard_iface->bat_v.elp_skb = dev_alloc_skb(size); | |
359 | if (!hard_iface->bat_v.elp_skb) | |
360 | goto out; | |
361 | ||
362 | skb_reserve(hard_iface->bat_v.elp_skb, ETH_HLEN + NET_IP_ALIGN); | |
b080db58 | 363 | elp_buff = skb_put_zero(hard_iface->bat_v.elp_skb, BATADV_ELP_HLEN); |
d6f94d91 | 364 | elp_packet = (struct batadv_elp_packet *)elp_buff; |
d6f94d91 LL |
365 | |
366 | elp_packet->packet_type = BATADV_ELP; | |
367 | elp_packet->version = BATADV_COMPAT_VERSION; | |
368 | ||
369 | /* randomize initial seqno to avoid collision */ | |
370 | get_random_bytes(&random_seqno, sizeof(random_seqno)); | |
371 | atomic_set(&hard_iface->bat_v.elp_seqno, random_seqno); | |
d6f94d91 | 372 | |
c833484e AQ |
373 | /* assume full-duplex by default */ |
374 | hard_iface->bat_v.flags |= BATADV_FULL_DUPLEX; | |
375 | ||
376 | /* warn the user (again) if there is no throughput data is available */ | |
377 | hard_iface->bat_v.flags &= ~BATADV_WARNING_DEFAULT; | |
378 | ||
10b1bbb4 | 379 | if (batadv_is_wifi_hardif(hard_iface)) |
c833484e AQ |
380 | hard_iface->bat_v.flags &= ~BATADV_FULL_DUPLEX; |
381 | ||
d6f94d91 LL |
382 | INIT_DELAYED_WORK(&hard_iface->bat_v.elp_wq, |
383 | batadv_v_elp_periodic_work); | |
384 | batadv_v_elp_start_timer(hard_iface); | |
385 | res = 0; | |
386 | ||
387 | out: | |
388 | return res; | |
389 | } | |
390 | ||
391 | /** | |
7e9a8c2c | 392 | * batadv_v_elp_iface_disable() - release ELP interface private resources |
d6f94d91 LL |
393 | * @hard_iface: interface for which the resources have to be released |
394 | */ | |
395 | void batadv_v_elp_iface_disable(struct batadv_hard_iface *hard_iface) | |
396 | { | |
397 | cancel_delayed_work_sync(&hard_iface->bat_v.elp_wq); | |
398 | ||
399 | dev_kfree_skb(hard_iface->bat_v.elp_skb); | |
400 | hard_iface->bat_v.elp_skb = NULL; | |
401 | } | |
402 | ||
ebe24cea | 403 | /** |
7e9a8c2c | 404 | * batadv_v_elp_iface_activate() - update the ELP buffer belonging to the given |
ebe24cea ML |
405 | * hard-interface |
406 | * @primary_iface: the new primary interface | |
407 | * @hard_iface: interface holding the to-be-updated buffer | |
408 | */ | |
409 | void batadv_v_elp_iface_activate(struct batadv_hard_iface *primary_iface, | |
410 | struct batadv_hard_iface *hard_iface) | |
411 | { | |
412 | struct batadv_elp_packet *elp_packet; | |
413 | struct sk_buff *skb; | |
414 | ||
415 | if (!hard_iface->bat_v.elp_skb) | |
416 | return; | |
417 | ||
418 | skb = hard_iface->bat_v.elp_skb; | |
419 | elp_packet = (struct batadv_elp_packet *)skb->data; | |
420 | ether_addr_copy(elp_packet->orig, | |
421 | primary_iface->net_dev->dev_addr); | |
422 | } | |
423 | ||
d6f94d91 | 424 | /** |
7e9a8c2c | 425 | * batadv_v_elp_primary_iface_set() - change internal data to reflect the new |
d6f94d91 LL |
426 | * primary interface |
427 | * @primary_iface: the new primary interface | |
428 | */ | |
429 | void batadv_v_elp_primary_iface_set(struct batadv_hard_iface *primary_iface) | |
430 | { | |
431 | struct batadv_hard_iface *hard_iface; | |
d6f94d91 LL |
432 | |
433 | /* update orig field of every elp iface belonging to this mesh */ | |
434 | rcu_read_lock(); | |
435 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { | |
436 | if (primary_iface->soft_iface != hard_iface->soft_iface) | |
437 | continue; | |
438 | ||
ebe24cea | 439 | batadv_v_elp_iface_activate(primary_iface, hard_iface); |
d6f94d91 LL |
440 | } |
441 | rcu_read_unlock(); | |
442 | } | |
162bd64c | 443 | |
162bd64c | 444 | /** |
7e9a8c2c | 445 | * batadv_v_elp_neigh_update() - update an ELP neighbour node |
162bd64c LL |
446 | * @bat_priv: the bat priv with all the soft interface information |
447 | * @neigh_addr: the neighbour interface address | |
448 | * @if_incoming: the interface the packet was received through | |
449 | * @elp_packet: the received ELP packet | |
450 | * | |
451 | * Updates the ELP neighbour node state with the data received within the new | |
452 | * ELP packet. | |
453 | */ | |
454 | static void batadv_v_elp_neigh_update(struct batadv_priv *bat_priv, | |
455 | u8 *neigh_addr, | |
456 | struct batadv_hard_iface *if_incoming, | |
457 | struct batadv_elp_packet *elp_packet) | |
458 | ||
459 | { | |
460 | struct batadv_neigh_node *neigh; | |
461 | struct batadv_orig_node *orig_neigh; | |
462 | struct batadv_hardif_neigh_node *hardif_neigh; | |
463 | s32 seqno_diff; | |
464 | s32 elp_latest_seqno; | |
465 | ||
466 | orig_neigh = batadv_v_ogm_orig_get(bat_priv, elp_packet->orig); | |
467 | if (!orig_neigh) | |
468 | return; | |
469 | ||
6f0a6b5e ML |
470 | neigh = batadv_neigh_node_get_or_create(orig_neigh, |
471 | if_incoming, neigh_addr); | |
162bd64c LL |
472 | if (!neigh) |
473 | goto orig_free; | |
474 | ||
475 | hardif_neigh = batadv_hardif_neigh_get(if_incoming, neigh_addr); | |
476 | if (!hardif_neigh) | |
477 | goto neigh_free; | |
478 | ||
479 | elp_latest_seqno = hardif_neigh->bat_v.elp_latest_seqno; | |
480 | seqno_diff = ntohl(elp_packet->seqno) - elp_latest_seqno; | |
481 | ||
482 | /* known or older sequence numbers are ignored. However always adopt | |
483 | * if the router seems to have been restarted. | |
484 | */ | |
485 | if (seqno_diff < 1 && seqno_diff > -BATADV_ELP_MAX_AGE) | |
486 | goto hardif_free; | |
487 | ||
488 | neigh->last_seen = jiffies; | |
489 | hardif_neigh->last_seen = jiffies; | |
490 | hardif_neigh->bat_v.elp_latest_seqno = ntohl(elp_packet->seqno); | |
491 | hardif_neigh->bat_v.elp_interval = ntohl(elp_packet->elp_interval); | |
492 | ||
493 | hardif_free: | |
494 | if (hardif_neigh) | |
495 | batadv_hardif_neigh_put(hardif_neigh); | |
496 | neigh_free: | |
497 | if (neigh) | |
498 | batadv_neigh_node_put(neigh); | |
499 | orig_free: | |
500 | if (orig_neigh) | |
501 | batadv_orig_node_put(orig_neigh); | |
502 | } | |
503 | ||
504 | /** | |
7e9a8c2c | 505 | * batadv_v_elp_packet_recv() - main ELP packet handler |
162bd64c LL |
506 | * @skb: the received packet |
507 | * @if_incoming: the interface this packet was received through | |
508 | * | |
509 | * Return: NET_RX_SUCCESS and consumes the skb if the packet was peoperly | |
510 | * processed or NET_RX_DROP in case of failure. | |
511 | */ | |
512 | int batadv_v_elp_packet_recv(struct sk_buff *skb, | |
513 | struct batadv_hard_iface *if_incoming) | |
514 | { | |
515 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); | |
516 | struct batadv_elp_packet *elp_packet; | |
517 | struct batadv_hard_iface *primary_if; | |
518 | struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
b91a2543 SE |
519 | bool res; |
520 | int ret = NET_RX_DROP; | |
162bd64c | 521 | |
b91a2543 SE |
522 | res = batadv_check_management_packet(skb, if_incoming, BATADV_ELP_HLEN); |
523 | if (!res) | |
524 | goto free_skb; | |
162bd64c LL |
525 | |
526 | if (batadv_is_my_mac(bat_priv, ethhdr->h_source)) | |
b91a2543 | 527 | goto free_skb; |
162bd64c LL |
528 | |
529 | /* did we receive a B.A.T.M.A.N. V ELP packet on an interface | |
530 | * that does not have B.A.T.M.A.N. V ELP enabled ? | |
531 | */ | |
29824a55 | 532 | if (strcmp(bat_priv->algo_ops->name, "BATMAN_V") != 0) |
b91a2543 | 533 | goto free_skb; |
162bd64c LL |
534 | |
535 | elp_packet = (struct batadv_elp_packet *)skb->data; | |
536 | ||
537 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
538 | "Received ELP packet from %pM seqno %u ORIG: %pM\n", | |
539 | ethhdr->h_source, ntohl(elp_packet->seqno), | |
540 | elp_packet->orig); | |
541 | ||
542 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
543 | if (!primary_if) | |
b91a2543 | 544 | goto free_skb; |
162bd64c LL |
545 | |
546 | batadv_v_elp_neigh_update(bat_priv, ethhdr->h_source, if_incoming, | |
547 | elp_packet); | |
548 | ||
b91a2543 SE |
549 | ret = NET_RX_SUCCESS; |
550 | batadv_hardif_put(primary_if); | |
551 | ||
552 | free_skb: | |
553 | if (ret == NET_RX_SUCCESS) | |
554 | consume_skb(skb); | |
555 | else | |
556 | kfree_skb(skb); | |
557 | ||
558 | return ret; | |
162bd64c | 559 | } |