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7db7d9f3 | 1 | // SPDX-License-Identifier: GPL-2.0 |
ac79cbb9 | 2 | /* Copyright (C) 2013-2017 B.A.T.M.A.N. contributors: |
0da00359 AQ |
3 | * |
4 | * Antonio Quartulli | |
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_ogm.h" | |
20 | #include "main.h" | |
21 | ||
22 | #include <linux/atomic.h> | |
23 | #include <linux/byteorder/generic.h> | |
24 | #include <linux/errno.h> | |
25 | #include <linux/etherdevice.h> | |
b92b94ac | 26 | #include <linux/gfp.h> |
0da00359 AQ |
27 | #include <linux/if_ether.h> |
28 | #include <linux/jiffies.h> | |
29 | #include <linux/kernel.h> | |
27353446 | 30 | #include <linux/kref.h> |
9323158e | 31 | #include <linux/list.h> |
0da00359 AQ |
32 | #include <linux/netdevice.h> |
33 | #include <linux/random.h> | |
34 | #include <linux/rculist.h> | |
35 | #include <linux/rcupdate.h> | |
36 | #include <linux/skbuff.h> | |
37 | #include <linux/slab.h> | |
38 | #include <linux/stddef.h> | |
39 | #include <linux/string.h> | |
40 | #include <linux/types.h> | |
41 | #include <linux/workqueue.h> | |
42 | ||
01d350d1 | 43 | #include "bat_algo.h" |
0da00359 | 44 | #include "hard-interface.h" |
9323158e | 45 | #include "hash.h" |
ba412080 | 46 | #include "log.h" |
9323158e | 47 | #include "originator.h" |
0da00359 AQ |
48 | #include "packet.h" |
49 | #include "routing.h" | |
50 | #include "send.h" | |
51 | #include "translation-table.h" | |
1f8dce49 | 52 | #include "tvlv.h" |
0da00359 | 53 | |
9323158e | 54 | /** |
7e9a8c2c | 55 | * batadv_v_ogm_orig_get() - retrieve and possibly create an originator node |
9323158e AQ |
56 | * @bat_priv: the bat priv with all the soft interface information |
57 | * @addr: the address of the originator | |
58 | * | |
59 | * Return: the orig_node corresponding to the specified address. If such object | |
60 | * does not exist it is allocated here. In case of allocation failure returns | |
61 | * NULL. | |
62 | */ | |
63 | struct batadv_orig_node *batadv_v_ogm_orig_get(struct batadv_priv *bat_priv, | |
64 | const u8 *addr) | |
65 | { | |
66 | struct batadv_orig_node *orig_node; | |
67 | int hash_added; | |
68 | ||
69 | orig_node = batadv_orig_hash_find(bat_priv, addr); | |
70 | if (orig_node) | |
71 | return orig_node; | |
72 | ||
73 | orig_node = batadv_orig_node_new(bat_priv, addr); | |
74 | if (!orig_node) | |
75 | return NULL; | |
76 | ||
55db2d59 | 77 | kref_get(&orig_node->refcount); |
9323158e AQ |
78 | hash_added = batadv_hash_add(bat_priv->orig_hash, batadv_compare_orig, |
79 | batadv_choose_orig, orig_node, | |
80 | &orig_node->hash_entry); | |
81 | if (hash_added != 0) { | |
55db2d59 | 82 | /* remove refcnt for newly created orig_node and hash entry */ |
9323158e AQ |
83 | batadv_orig_node_put(orig_node); |
84 | batadv_orig_node_put(orig_node); | |
85 | orig_node = NULL; | |
86 | } | |
87 | ||
88 | return orig_node; | |
89 | } | |
90 | ||
0da00359 | 91 | /** |
7e9a8c2c | 92 | * batadv_v_ogm_start_timer() - restart the OGM sending timer |
0da00359 AQ |
93 | * @bat_priv: the bat priv with all the soft interface information |
94 | */ | |
95 | static void batadv_v_ogm_start_timer(struct batadv_priv *bat_priv) | |
96 | { | |
97 | unsigned long msecs; | |
98 | /* this function may be invoked in different contexts (ogm rescheduling | |
99 | * or hard_iface activation), but the work timer should not be reset | |
100 | */ | |
101 | if (delayed_work_pending(&bat_priv->bat_v.ogm_wq)) | |
102 | return; | |
103 | ||
104 | msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER; | |
105 | msecs += prandom_u32() % (2 * BATADV_JITTER); | |
106 | queue_delayed_work(batadv_event_workqueue, &bat_priv->bat_v.ogm_wq, | |
107 | msecs_to_jiffies(msecs)); | |
108 | } | |
109 | ||
110 | /** | |
7e9a8c2c | 111 | * batadv_v_ogm_send_to_if() - send a batman ogm using a given interface |
0da00359 AQ |
112 | * @skb: the OGM to send |
113 | * @hard_iface: the interface to use to send the OGM | |
114 | */ | |
115 | static void batadv_v_ogm_send_to_if(struct sk_buff *skb, | |
116 | struct batadv_hard_iface *hard_iface) | |
117 | { | |
118 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); | |
119 | ||
120 | if (hard_iface->if_status != BATADV_IF_ACTIVE) | |
121 | return; | |
122 | ||
123 | batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX); | |
124 | batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES, | |
125 | skb->len + ETH_HLEN); | |
126 | ||
95d39278 | 127 | batadv_send_broadcast_skb(skb, hard_iface); |
0da00359 AQ |
128 | } |
129 | ||
130 | /** | |
7e9a8c2c | 131 | * batadv_v_ogm_send() - periodic worker broadcasting the own OGM |
0da00359 AQ |
132 | * @work: work queue item |
133 | */ | |
134 | static void batadv_v_ogm_send(struct work_struct *work) | |
135 | { | |
136 | struct batadv_hard_iface *hard_iface; | |
137 | struct batadv_priv_bat_v *bat_v; | |
138 | struct batadv_priv *bat_priv; | |
139 | struct batadv_ogm2_packet *ogm_packet; | |
140 | struct sk_buff *skb, *skb_tmp; | |
e04de486 | 141 | unsigned char *ogm_buff; |
0da00359 AQ |
142 | int ogm_buff_len; |
143 | u16 tvlv_len = 0; | |
3111beed | 144 | int ret; |
0da00359 AQ |
145 | |
146 | bat_v = container_of(work, struct batadv_priv_bat_v, ogm_wq.work); | |
147 | bat_priv = container_of(bat_v, struct batadv_priv, bat_v); | |
148 | ||
149 | if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING) | |
150 | goto out; | |
151 | ||
152 | ogm_buff = bat_priv->bat_v.ogm_buff; | |
153 | ogm_buff_len = bat_priv->bat_v.ogm_buff_len; | |
154 | /* tt changes have to be committed before the tvlv data is | |
155 | * appended as it may alter the tt tvlv container | |
156 | */ | |
157 | batadv_tt_local_commit_changes(bat_priv); | |
158 | tvlv_len = batadv_tvlv_container_ogm_append(bat_priv, &ogm_buff, | |
159 | &ogm_buff_len, | |
160 | BATADV_OGM2_HLEN); | |
161 | ||
162 | bat_priv->bat_v.ogm_buff = ogm_buff; | |
163 | bat_priv->bat_v.ogm_buff_len = ogm_buff_len; | |
164 | ||
165 | skb = netdev_alloc_skb_ip_align(NULL, ETH_HLEN + ogm_buff_len); | |
166 | if (!skb) | |
167 | goto reschedule; | |
168 | ||
169 | skb_reserve(skb, ETH_HLEN); | |
e04de486 | 170 | skb_put_data(skb, ogm_buff, ogm_buff_len); |
0da00359 AQ |
171 | |
172 | ogm_packet = (struct batadv_ogm2_packet *)skb->data; | |
173 | ogm_packet->seqno = htonl(atomic_read(&bat_priv->bat_v.ogm_seqno)); | |
174 | atomic_inc(&bat_priv->bat_v.ogm_seqno); | |
175 | ogm_packet->tvlv_len = htons(tvlv_len); | |
176 | ||
177 | /* broadcast on every interface */ | |
178 | rcu_read_lock(); | |
179 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { | |
180 | if (hard_iface->soft_iface != bat_priv->soft_iface) | |
181 | continue; | |
182 | ||
27353446 SE |
183 | if (!kref_get_unless_zero(&hard_iface->refcount)) |
184 | continue; | |
185 | ||
3111beed LL |
186 | ret = batadv_hardif_no_broadcast(hard_iface, NULL, NULL); |
187 | if (ret) { | |
188 | char *type; | |
189 | ||
190 | switch (ret) { | |
191 | case BATADV_HARDIF_BCAST_NORECIPIENT: | |
192 | type = "no neighbor"; | |
193 | break; | |
194 | case BATADV_HARDIF_BCAST_DUPFWD: | |
195 | type = "single neighbor is source"; | |
196 | break; | |
197 | case BATADV_HARDIF_BCAST_DUPORIG: | |
198 | type = "single neighbor is originator"; | |
199 | break; | |
200 | default: | |
201 | type = "unknown"; | |
202 | } | |
203 | ||
f25cbb2a | 204 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "OGM2 from ourselves on %s suppressed: %s\n", |
3111beed LL |
205 | hard_iface->net_dev->name, type); |
206 | ||
207 | batadv_hardif_put(hard_iface); | |
208 | continue; | |
209 | } | |
210 | ||
0da00359 AQ |
211 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
212 | "Sending own OGM2 packet (originator %pM, seqno %u, throughput %u, TTL %d) on interface %s [%pM]\n", | |
213 | ogm_packet->orig, ntohl(ogm_packet->seqno), | |
214 | ntohl(ogm_packet->throughput), ogm_packet->ttl, | |
215 | hard_iface->net_dev->name, | |
216 | hard_iface->net_dev->dev_addr); | |
217 | ||
218 | /* this skb gets consumed by batadv_v_ogm_send_to_if() */ | |
219 | skb_tmp = skb_clone(skb, GFP_ATOMIC); | |
27353446 SE |
220 | if (!skb_tmp) { |
221 | batadv_hardif_put(hard_iface); | |
0da00359 | 222 | break; |
27353446 | 223 | } |
0da00359 AQ |
224 | |
225 | batadv_v_ogm_send_to_if(skb_tmp, hard_iface); | |
27353446 | 226 | batadv_hardif_put(hard_iface); |
0da00359 AQ |
227 | } |
228 | rcu_read_unlock(); | |
229 | ||
230 | consume_skb(skb); | |
231 | ||
232 | reschedule: | |
233 | batadv_v_ogm_start_timer(bat_priv); | |
234 | out: | |
235 | return; | |
236 | } | |
237 | ||
238 | /** | |
7e9a8c2c | 239 | * batadv_v_ogm_iface_enable() - prepare an interface for B.A.T.M.A.N. V |
0da00359 AQ |
240 | * @hard_iface: the interface to prepare |
241 | * | |
242 | * Takes care of scheduling own OGM sending routine for this interface. | |
243 | * | |
244 | * Return: 0 on success or a negative error code otherwise | |
245 | */ | |
246 | int batadv_v_ogm_iface_enable(struct batadv_hard_iface *hard_iface) | |
247 | { | |
248 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); | |
249 | ||
250 | batadv_v_ogm_start_timer(bat_priv); | |
251 | ||
252 | return 0; | |
253 | } | |
254 | ||
255 | /** | |
7e9a8c2c | 256 | * batadv_v_ogm_primary_iface_set() - set a new primary interface |
0da00359 AQ |
257 | * @primary_iface: the new primary interface |
258 | */ | |
259 | void batadv_v_ogm_primary_iface_set(struct batadv_hard_iface *primary_iface) | |
260 | { | |
261 | struct batadv_priv *bat_priv = netdev_priv(primary_iface->soft_iface); | |
262 | struct batadv_ogm2_packet *ogm_packet; | |
263 | ||
264 | if (!bat_priv->bat_v.ogm_buff) | |
265 | return; | |
266 | ||
267 | ogm_packet = (struct batadv_ogm2_packet *)bat_priv->bat_v.ogm_buff; | |
268 | ether_addr_copy(ogm_packet->orig, primary_iface->net_dev->dev_addr); | |
269 | } | |
270 | ||
9323158e | 271 | /** |
7e9a8c2c SE |
272 | * batadv_v_forward_penalty() - apply a penalty to the throughput metric |
273 | * forwarded with B.A.T.M.A.N. V OGMs | |
9323158e AQ |
274 | * @bat_priv: the bat priv with all the soft interface information |
275 | * @if_incoming: the interface where the OGM has been received | |
276 | * @if_outgoing: the interface where the OGM has to be forwarded to | |
277 | * @throughput: the current throughput | |
278 | * | |
279 | * Apply a penalty on the current throughput metric value based on the | |
280 | * characteristic of the interface where the OGM has been received. The return | |
281 | * value is computed as follows: | |
282 | * - throughput * 50% if the incoming and outgoing interface are the | |
283 | * same WiFi interface and the throughput is above | |
284 | * 1MBit/s | |
285 | * - throughput if the outgoing interface is the default | |
286 | * interface (i.e. this OGM is processed for the | |
287 | * internal table and not forwarded) | |
288 | * - throughput * hop penalty otherwise | |
289 | * | |
290 | * Return: the penalised throughput metric. | |
291 | */ | |
292 | static u32 batadv_v_forward_penalty(struct batadv_priv *bat_priv, | |
293 | struct batadv_hard_iface *if_incoming, | |
294 | struct batadv_hard_iface *if_outgoing, | |
295 | u32 throughput) | |
296 | { | |
297 | int hop_penalty = atomic_read(&bat_priv->hop_penalty); | |
298 | int hop_penalty_max = BATADV_TQ_MAX_VALUE; | |
299 | ||
300 | /* Don't apply hop penalty in default originator table. */ | |
301 | if (if_outgoing == BATADV_IF_DEFAULT) | |
302 | return throughput; | |
303 | ||
304 | /* Forwarding on the same WiFi interface cuts the throughput in half | |
305 | * due to the store & forward characteristics of WIFI. | |
306 | * Very low throughput values are the exception. | |
307 | */ | |
825ffe1f SE |
308 | if (throughput > 10 && |
309 | if_incoming == if_outgoing && | |
c833484e | 310 | !(if_incoming->bat_v.flags & BATADV_FULL_DUPLEX)) |
9323158e AQ |
311 | return throughput / 2; |
312 | ||
313 | /* hop penalty of 255 equals 100% */ | |
314 | return throughput * (hop_penalty_max - hop_penalty) / hop_penalty_max; | |
315 | } | |
316 | ||
317 | /** | |
7e9a8c2c | 318 | * batadv_v_ogm_forward() - check conditions and forward an OGM to the given |
efcc9d30 | 319 | * outgoing interface |
9323158e AQ |
320 | * @bat_priv: the bat priv with all the soft interface information |
321 | * @ogm_received: previously received OGM to be forwarded | |
efcc9d30 SW |
322 | * @orig_node: the originator which has been updated |
323 | * @neigh_node: the neigh_node through with the OGM has been received | |
9323158e AQ |
324 | * @if_incoming: the interface on which this OGM was received on |
325 | * @if_outgoing: the interface to which the OGM has to be forwarded to | |
326 | * | |
327 | * Forward an OGM to an interface after having altered the throughput metric and | |
328 | * the TTL value contained in it. The original OGM isn't modified. | |
329 | */ | |
330 | static void batadv_v_ogm_forward(struct batadv_priv *bat_priv, | |
331 | const struct batadv_ogm2_packet *ogm_received, | |
efcc9d30 SW |
332 | struct batadv_orig_node *orig_node, |
333 | struct batadv_neigh_node *neigh_node, | |
9323158e AQ |
334 | struct batadv_hard_iface *if_incoming, |
335 | struct batadv_hard_iface *if_outgoing) | |
336 | { | |
efcc9d30 SW |
337 | struct batadv_neigh_ifinfo *neigh_ifinfo = NULL; |
338 | struct batadv_orig_ifinfo *orig_ifinfo = NULL; | |
339 | struct batadv_neigh_node *router = NULL; | |
9323158e AQ |
340 | struct batadv_ogm2_packet *ogm_forward; |
341 | unsigned char *skb_buff; | |
342 | struct sk_buff *skb; | |
343 | size_t packet_len; | |
344 | u16 tvlv_len; | |
345 | ||
efcc9d30 SW |
346 | /* only forward for specific interfaces, not for the default one. */ |
347 | if (if_outgoing == BATADV_IF_DEFAULT) | |
348 | goto out; | |
349 | ||
350 | orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing); | |
351 | if (!orig_ifinfo) | |
352 | goto out; | |
353 | ||
354 | /* acquire possibly updated router */ | |
355 | router = batadv_orig_router_get(orig_node, if_outgoing); | |
356 | ||
357 | /* strict rule: forward packets coming from the best next hop only */ | |
358 | if (neigh_node != router) | |
359 | goto out; | |
360 | ||
361 | /* don't forward the same seqno twice on one interface */ | |
362 | if (orig_ifinfo->last_seqno_forwarded == ntohl(ogm_received->seqno)) | |
363 | goto out; | |
364 | ||
365 | orig_ifinfo->last_seqno_forwarded = ntohl(ogm_received->seqno); | |
366 | ||
9323158e AQ |
367 | if (ogm_received->ttl <= 1) { |
368 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n"); | |
efcc9d30 | 369 | goto out; |
9323158e AQ |
370 | } |
371 | ||
efcc9d30 SW |
372 | neigh_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing); |
373 | if (!neigh_ifinfo) | |
374 | goto out; | |
375 | ||
9323158e AQ |
376 | tvlv_len = ntohs(ogm_received->tvlv_len); |
377 | ||
378 | packet_len = BATADV_OGM2_HLEN + tvlv_len; | |
379 | skb = netdev_alloc_skb_ip_align(if_outgoing->net_dev, | |
380 | ETH_HLEN + packet_len); | |
381 | if (!skb) | |
efcc9d30 | 382 | goto out; |
9323158e AQ |
383 | |
384 | skb_reserve(skb, ETH_HLEN); | |
59ae1d12 | 385 | skb_buff = skb_put_data(skb, ogm_received, packet_len); |
9323158e AQ |
386 | |
387 | /* apply forward penalty */ | |
388 | ogm_forward = (struct batadv_ogm2_packet *)skb_buff; | |
efcc9d30 | 389 | ogm_forward->throughput = htonl(neigh_ifinfo->bat_v.throughput); |
9323158e AQ |
390 | ogm_forward->ttl--; |
391 | ||
392 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
393 | "Forwarding OGM2 packet on %s: throughput %u, ttl %u, received via %s\n", | |
efcc9d30 SW |
394 | if_outgoing->net_dev->name, ntohl(ogm_forward->throughput), |
395 | ogm_forward->ttl, if_incoming->net_dev->name); | |
9323158e AQ |
396 | |
397 | batadv_v_ogm_send_to_if(skb, if_outgoing); | |
efcc9d30 SW |
398 | |
399 | out: | |
400 | if (orig_ifinfo) | |
401 | batadv_orig_ifinfo_put(orig_ifinfo); | |
402 | if (router) | |
403 | batadv_neigh_node_put(router); | |
404 | if (neigh_ifinfo) | |
405 | batadv_neigh_ifinfo_put(neigh_ifinfo); | |
9323158e AQ |
406 | } |
407 | ||
408 | /** | |
7e9a8c2c | 409 | * batadv_v_ogm_metric_update() - update route metric based on OGM |
9323158e AQ |
410 | * @bat_priv: the bat priv with all the soft interface information |
411 | * @ogm2: OGM2 structure | |
412 | * @orig_node: Originator structure for which the OGM has been received | |
413 | * @neigh_node: the neigh_node through with the OGM has been received | |
414 | * @if_incoming: the interface where this packet was received | |
415 | * @if_outgoing: the interface for which the packet should be considered | |
416 | * | |
417 | * Return: | |
418 | * 1 if the OGM is new, | |
419 | * 0 if it is not new but valid, | |
420 | * <0 on error (e.g. old OGM) | |
421 | */ | |
422 | static int batadv_v_ogm_metric_update(struct batadv_priv *bat_priv, | |
423 | const struct batadv_ogm2_packet *ogm2, | |
424 | struct batadv_orig_node *orig_node, | |
425 | struct batadv_neigh_node *neigh_node, | |
426 | struct batadv_hard_iface *if_incoming, | |
427 | struct batadv_hard_iface *if_outgoing) | |
428 | { | |
422d2f77 | 429 | struct batadv_orig_ifinfo *orig_ifinfo; |
9323158e AQ |
430 | struct batadv_neigh_ifinfo *neigh_ifinfo = NULL; |
431 | bool protection_started = false; | |
432 | int ret = -EINVAL; | |
433 | u32 path_throughput; | |
434 | s32 seq_diff; | |
435 | ||
436 | orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing); | |
437 | if (!orig_ifinfo) | |
438 | goto out; | |
439 | ||
440 | seq_diff = ntohl(ogm2->seqno) - orig_ifinfo->last_real_seqno; | |
441 | ||
442 | if (!hlist_empty(&orig_node->neigh_list) && | |
443 | batadv_window_protected(bat_priv, seq_diff, | |
444 | BATADV_OGM_MAX_AGE, | |
445 | &orig_ifinfo->batman_seqno_reset, | |
446 | &protection_started)) { | |
447 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
448 | "Drop packet: packet within window protection time from %pM\n", | |
449 | ogm2->orig); | |
450 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
451 | "Last reset: %ld, %ld\n", | |
452 | orig_ifinfo->batman_seqno_reset, jiffies); | |
453 | goto out; | |
454 | } | |
455 | ||
456 | /* drop packets with old seqnos, however accept the first packet after | |
457 | * a host has been rebooted. | |
458 | */ | |
825ffe1f | 459 | if (seq_diff < 0 && !protection_started) |
9323158e AQ |
460 | goto out; |
461 | ||
462 | neigh_node->last_seen = jiffies; | |
463 | ||
464 | orig_node->last_seen = jiffies; | |
465 | ||
466 | orig_ifinfo->last_real_seqno = ntohl(ogm2->seqno); | |
467 | orig_ifinfo->last_ttl = ogm2->ttl; | |
468 | ||
469 | neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing); | |
470 | if (!neigh_ifinfo) | |
471 | goto out; | |
472 | ||
473 | path_throughput = batadv_v_forward_penalty(bat_priv, if_incoming, | |
474 | if_outgoing, | |
475 | ntohl(ogm2->throughput)); | |
476 | neigh_ifinfo->bat_v.throughput = path_throughput; | |
477 | neigh_ifinfo->bat_v.last_seqno = ntohl(ogm2->seqno); | |
478 | neigh_ifinfo->last_ttl = ogm2->ttl; | |
479 | ||
480 | if (seq_diff > 0 || protection_started) | |
481 | ret = 1; | |
482 | else | |
483 | ret = 0; | |
484 | out: | |
485 | if (orig_ifinfo) | |
486 | batadv_orig_ifinfo_put(orig_ifinfo); | |
487 | if (neigh_ifinfo) | |
488 | batadv_neigh_ifinfo_put(neigh_ifinfo); | |
489 | ||
490 | return ret; | |
491 | } | |
492 | ||
493 | /** | |
7e9a8c2c | 494 | * batadv_v_ogm_route_update() - update routes based on OGM |
9323158e AQ |
495 | * @bat_priv: the bat priv with all the soft interface information |
496 | * @ethhdr: the Ethernet header of the OGM2 | |
497 | * @ogm2: OGM2 structure | |
498 | * @orig_node: Originator structure for which the OGM has been received | |
499 | * @neigh_node: the neigh_node through with the OGM has been received | |
500 | * @if_incoming: the interface where this packet was received | |
501 | * @if_outgoing: the interface for which the packet should be considered | |
efcc9d30 SW |
502 | * |
503 | * Return: true if the packet should be forwarded, false otherwise | |
9323158e | 504 | */ |
efcc9d30 | 505 | static bool batadv_v_ogm_route_update(struct batadv_priv *bat_priv, |
9323158e AQ |
506 | const struct ethhdr *ethhdr, |
507 | const struct batadv_ogm2_packet *ogm2, | |
508 | struct batadv_orig_node *orig_node, | |
509 | struct batadv_neigh_node *neigh_node, | |
510 | struct batadv_hard_iface *if_incoming, | |
511 | struct batadv_hard_iface *if_outgoing) | |
512 | { | |
513 | struct batadv_neigh_node *router = NULL; | |
422d2f77 | 514 | struct batadv_orig_node *orig_neigh_node; |
9323158e | 515 | struct batadv_neigh_node *orig_neigh_router = NULL; |
86de37c1 SW |
516 | struct batadv_neigh_ifinfo *router_ifinfo = NULL, *neigh_ifinfo = NULL; |
517 | u32 router_throughput, neigh_throughput; | |
518 | u32 router_last_seqno; | |
519 | u32 neigh_last_seqno; | |
520 | s32 neigh_seq_diff; | |
efcc9d30 | 521 | bool forward = false; |
9323158e AQ |
522 | |
523 | orig_neigh_node = batadv_v_ogm_orig_get(bat_priv, ethhdr->h_source); | |
524 | if (!orig_neigh_node) | |
525 | goto out; | |
526 | ||
527 | orig_neigh_router = batadv_orig_router_get(orig_neigh_node, | |
528 | if_outgoing); | |
529 | ||
530 | /* drop packet if sender is not a direct neighbor and if we | |
531 | * don't route towards it | |
532 | */ | |
533 | router = batadv_orig_router_get(orig_node, if_outgoing); | |
534 | if (router && router->orig_node != orig_node && !orig_neigh_router) { | |
535 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
536 | "Drop packet: OGM via unknown neighbor!\n"); | |
537 | goto out; | |
538 | } | |
539 | ||
86de37c1 SW |
540 | /* Mark the OGM to be considered for forwarding, and update routes |
541 | * if needed. | |
542 | */ | |
efcc9d30 | 543 | forward = true; |
86de37c1 SW |
544 | |
545 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
546 | "Searching and updating originator entry of received packet\n"); | |
547 | ||
548 | /* if this neighbor already is our next hop there is nothing | |
549 | * to change | |
550 | */ | |
551 | if (router == neigh_node) | |
552 | goto out; | |
553 | ||
554 | /* don't consider neighbours with worse throughput. | |
555 | * also switch route if this seqno is BATADV_V_MAX_ORIGDIFF newer than | |
556 | * the last received seqno from our best next hop. | |
557 | */ | |
558 | if (router) { | |
559 | router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing); | |
560 | neigh_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing); | |
561 | ||
562 | /* if these are not allocated, something is wrong. */ | |
563 | if (!router_ifinfo || !neigh_ifinfo) | |
564 | goto out; | |
565 | ||
566 | neigh_last_seqno = neigh_ifinfo->bat_v.last_seqno; | |
567 | router_last_seqno = router_ifinfo->bat_v.last_seqno; | |
568 | neigh_seq_diff = neigh_last_seqno - router_last_seqno; | |
569 | router_throughput = router_ifinfo->bat_v.throughput; | |
570 | neigh_throughput = neigh_ifinfo->bat_v.throughput; | |
571 | ||
825ffe1f SE |
572 | if (neigh_seq_diff < BATADV_OGM_MAX_ORIGDIFF && |
573 | router_throughput >= neigh_throughput) | |
86de37c1 SW |
574 | goto out; |
575 | } | |
576 | ||
577 | batadv_update_route(bat_priv, orig_node, if_outgoing, neigh_node); | |
9323158e | 578 | out: |
9323158e AQ |
579 | if (router) |
580 | batadv_neigh_node_put(router); | |
581 | if (orig_neigh_router) | |
582 | batadv_neigh_node_put(orig_neigh_router); | |
583 | if (orig_neigh_node) | |
584 | batadv_orig_node_put(orig_neigh_node); | |
86de37c1 SW |
585 | if (router_ifinfo) |
586 | batadv_neigh_ifinfo_put(router_ifinfo); | |
587 | if (neigh_ifinfo) | |
588 | batadv_neigh_ifinfo_put(neigh_ifinfo); | |
efcc9d30 SW |
589 | |
590 | return forward; | |
9323158e AQ |
591 | } |
592 | ||
593 | /** | |
7e9a8c2c | 594 | * batadv_v_ogm_process_per_outif() - process a batman v OGM for an outgoing if |
9323158e AQ |
595 | * @bat_priv: the bat priv with all the soft interface information |
596 | * @ethhdr: the Ethernet header of the OGM2 | |
597 | * @ogm2: OGM2 structure | |
598 | * @orig_node: Originator structure for which the OGM has been received | |
599 | * @neigh_node: the neigh_node through with the OGM has been received | |
600 | * @if_incoming: the interface where this packet was received | |
601 | * @if_outgoing: the interface for which the packet should be considered | |
602 | */ | |
603 | static void | |
604 | batadv_v_ogm_process_per_outif(struct batadv_priv *bat_priv, | |
605 | const struct ethhdr *ethhdr, | |
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 | { | |
612 | int seqno_age; | |
efcc9d30 | 613 | bool forward; |
9323158e AQ |
614 | |
615 | /* first, update the metric with according sanity checks */ | |
616 | seqno_age = batadv_v_ogm_metric_update(bat_priv, ogm2, orig_node, | |
617 | neigh_node, if_incoming, | |
618 | if_outgoing); | |
619 | ||
620 | /* outdated sequence numbers are to be discarded */ | |
621 | if (seqno_age < 0) | |
622 | return; | |
623 | ||
624 | /* only unknown & newer OGMs contain TVLVs we are interested in */ | |
825ffe1f | 625 | if (seqno_age > 0 && if_outgoing == BATADV_IF_DEFAULT) |
9323158e AQ |
626 | batadv_tvlv_containers_process(bat_priv, true, orig_node, |
627 | NULL, NULL, | |
628 | (unsigned char *)(ogm2 + 1), | |
629 | ntohs(ogm2->tvlv_len)); | |
630 | ||
631 | /* if the metric update went through, update routes if needed */ | |
efcc9d30 SW |
632 | forward = batadv_v_ogm_route_update(bat_priv, ethhdr, ogm2, orig_node, |
633 | neigh_node, if_incoming, | |
634 | if_outgoing); | |
635 | ||
636 | /* if the routes have been processed correctly, check and forward */ | |
637 | if (forward) | |
638 | batadv_v_ogm_forward(bat_priv, ogm2, orig_node, neigh_node, | |
639 | if_incoming, if_outgoing); | |
9323158e AQ |
640 | } |
641 | ||
642 | /** | |
7e9a8c2c | 643 | * batadv_v_ogm_aggr_packet() - checks if there is another OGM aggregated |
9323158e AQ |
644 | * @buff_pos: current position in the skb |
645 | * @packet_len: total length of the skb | |
646 | * @tvlv_len: tvlv length of the previously considered OGM | |
647 | * | |
648 | * Return: true if there is enough space for another OGM, false otherwise. | |
649 | */ | |
650 | static bool batadv_v_ogm_aggr_packet(int buff_pos, int packet_len, | |
651 | __be16 tvlv_len) | |
652 | { | |
653 | int next_buff_pos = 0; | |
654 | ||
655 | next_buff_pos += buff_pos + BATADV_OGM2_HLEN; | |
656 | next_buff_pos += ntohs(tvlv_len); | |
657 | ||
658 | return (next_buff_pos <= packet_len) && | |
659 | (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES); | |
660 | } | |
661 | ||
662 | /** | |
7e9a8c2c | 663 | * batadv_v_ogm_process() - process an incoming batman v OGM |
9323158e AQ |
664 | * @skb: the skb containing the OGM |
665 | * @ogm_offset: offset to the OGM which should be processed (for aggregates) | |
666 | * @if_incoming: the interface where this packet was receved | |
667 | */ | |
668 | static void batadv_v_ogm_process(const struct sk_buff *skb, int ogm_offset, | |
669 | struct batadv_hard_iface *if_incoming) | |
670 | { | |
671 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); | |
672 | struct ethhdr *ethhdr; | |
673 | struct batadv_orig_node *orig_node = NULL; | |
674 | struct batadv_hardif_neigh_node *hardif_neigh = NULL; | |
675 | struct batadv_neigh_node *neigh_node = NULL; | |
676 | struct batadv_hard_iface *hard_iface; | |
677 | struct batadv_ogm2_packet *ogm_packet; | |
678 | u32 ogm_throughput, link_throughput, path_throughput; | |
3111beed | 679 | int ret; |
9323158e AQ |
680 | |
681 | ethhdr = eth_hdr(skb); | |
682 | ogm_packet = (struct batadv_ogm2_packet *)(skb->data + ogm_offset); | |
683 | ||
684 | ogm_throughput = ntohl(ogm_packet->throughput); | |
685 | ||
686 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
f25cbb2a | 687 | "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 |
688 | ethhdr->h_source, if_incoming->net_dev->name, |
689 | if_incoming->net_dev->dev_addr, ogm_packet->orig, | |
690 | ntohl(ogm_packet->seqno), ogm_throughput, ogm_packet->ttl, | |
691 | ogm_packet->version, ntohs(ogm_packet->tvlv_len)); | |
692 | ||
f25cbb2a CIK |
693 | /* If the throughput metric is 0, immediately drop the packet. No need |
694 | * to create orig_node / neigh_node for an unusable route. | |
9323158e AQ |
695 | */ |
696 | if (ogm_throughput == 0) { | |
697 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
f25cbb2a | 698 | "Drop packet: originator packet with throughput metric of 0\n"); |
9323158e AQ |
699 | return; |
700 | } | |
701 | ||
702 | /* require ELP packets be to received from this neighbor first */ | |
703 | hardif_neigh = batadv_hardif_neigh_get(if_incoming, ethhdr->h_source); | |
704 | if (!hardif_neigh) { | |
705 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
706 | "Drop packet: OGM via unknown neighbor!\n"); | |
707 | goto out; | |
708 | } | |
709 | ||
710 | orig_node = batadv_v_ogm_orig_get(bat_priv, ogm_packet->orig); | |
711 | if (!orig_node) | |
712 | return; | |
713 | ||
6f0a6b5e ML |
714 | neigh_node = batadv_neigh_node_get_or_create(orig_node, if_incoming, |
715 | ethhdr->h_source); | |
9323158e AQ |
716 | if (!neigh_node) |
717 | goto out; | |
718 | ||
719 | /* Update the received throughput metric to match the link | |
720 | * characteristic: | |
721 | * - If this OGM traveled one hop so far (emitted by single hop | |
722 | * neighbor) the path throughput metric equals the link throughput. | |
723 | * - For OGMs traversing more than hop the path throughput metric is | |
724 | * the smaller of the path throughput and the link throughput. | |
725 | */ | |
726 | link_throughput = ewma_throughput_read(&hardif_neigh->bat_v.throughput); | |
727 | path_throughput = min_t(u32, link_throughput, ogm_throughput); | |
728 | ogm_packet->throughput = htonl(path_throughput); | |
729 | ||
730 | batadv_v_ogm_process_per_outif(bat_priv, ethhdr, ogm_packet, orig_node, | |
731 | neigh_node, if_incoming, | |
732 | BATADV_IF_DEFAULT); | |
733 | ||
734 | rcu_read_lock(); | |
735 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { | |
736 | if (hard_iface->if_status != BATADV_IF_ACTIVE) | |
737 | continue; | |
738 | ||
739 | if (hard_iface->soft_iface != bat_priv->soft_iface) | |
740 | continue; | |
741 | ||
27353446 SE |
742 | if (!kref_get_unless_zero(&hard_iface->refcount)) |
743 | continue; | |
744 | ||
3111beed LL |
745 | ret = batadv_hardif_no_broadcast(hard_iface, |
746 | ogm_packet->orig, | |
747 | hardif_neigh->orig); | |
748 | ||
749 | if (ret) { | |
750 | char *type; | |
751 | ||
752 | switch (ret) { | |
753 | case BATADV_HARDIF_BCAST_NORECIPIENT: | |
754 | type = "no neighbor"; | |
755 | break; | |
756 | case BATADV_HARDIF_BCAST_DUPFWD: | |
757 | type = "single neighbor is source"; | |
758 | break; | |
759 | case BATADV_HARDIF_BCAST_DUPORIG: | |
760 | type = "single neighbor is originator"; | |
761 | break; | |
762 | default: | |
763 | type = "unknown"; | |
764 | } | |
765 | ||
f25cbb2a | 766 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "OGM2 packet from %pM on %s suppressed: %s\n", |
3111beed LL |
767 | ogm_packet->orig, hard_iface->net_dev->name, |
768 | type); | |
769 | ||
770 | batadv_hardif_put(hard_iface); | |
771 | continue; | |
772 | } | |
773 | ||
9323158e AQ |
774 | batadv_v_ogm_process_per_outif(bat_priv, ethhdr, ogm_packet, |
775 | orig_node, neigh_node, | |
776 | if_incoming, hard_iface); | |
27353446 SE |
777 | |
778 | batadv_hardif_put(hard_iface); | |
9323158e AQ |
779 | } |
780 | rcu_read_unlock(); | |
781 | out: | |
782 | if (orig_node) | |
783 | batadv_orig_node_put(orig_node); | |
784 | if (neigh_node) | |
785 | batadv_neigh_node_put(neigh_node); | |
786 | if (hardif_neigh) | |
787 | batadv_hardif_neigh_put(hardif_neigh); | |
788 | } | |
789 | ||
0da00359 | 790 | /** |
7e9a8c2c | 791 | * batadv_v_ogm_packet_recv() - OGM2 receiving handler |
0da00359 AQ |
792 | * @skb: the received OGM |
793 | * @if_incoming: the interface where this OGM has been received | |
794 | * | |
795 | * Return: NET_RX_SUCCESS and consume the skb on success or returns NET_RX_DROP | |
796 | * (without freeing the skb) on failure | |
797 | */ | |
798 | int batadv_v_ogm_packet_recv(struct sk_buff *skb, | |
799 | struct batadv_hard_iface *if_incoming) | |
800 | { | |
801 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); | |
802 | struct batadv_ogm2_packet *ogm_packet; | |
803 | struct ethhdr *ethhdr = eth_hdr(skb); | |
9323158e AQ |
804 | int ogm_offset; |
805 | u8 *packet_pos; | |
806 | int ret = NET_RX_DROP; | |
0da00359 AQ |
807 | |
808 | /* did we receive a OGM2 packet on an interface that does not have | |
809 | * B.A.T.M.A.N. V enabled ? | |
810 | */ | |
29824a55 | 811 | if (strcmp(bat_priv->algo_ops->name, "BATMAN_V") != 0) |
b91a2543 | 812 | goto free_skb; |
0da00359 AQ |
813 | |
814 | if (!batadv_check_management_packet(skb, if_incoming, BATADV_OGM2_HLEN)) | |
b91a2543 | 815 | goto free_skb; |
0da00359 AQ |
816 | |
817 | if (batadv_is_my_mac(bat_priv, ethhdr->h_source)) | |
b91a2543 | 818 | goto free_skb; |
0da00359 AQ |
819 | |
820 | ogm_packet = (struct batadv_ogm2_packet *)skb->data; | |
821 | ||
822 | if (batadv_is_my_mac(bat_priv, ogm_packet->orig)) | |
b91a2543 | 823 | goto free_skb; |
0da00359 AQ |
824 | |
825 | batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX); | |
826 | batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES, | |
827 | skb->len + ETH_HLEN); | |
828 | ||
9323158e AQ |
829 | ogm_offset = 0; |
830 | ogm_packet = (struct batadv_ogm2_packet *)skb->data; | |
831 | ||
832 | while (batadv_v_ogm_aggr_packet(ogm_offset, skb_headlen(skb), | |
833 | ogm_packet->tvlv_len)) { | |
834 | batadv_v_ogm_process(skb, ogm_offset, if_incoming); | |
835 | ||
836 | ogm_offset += BATADV_OGM2_HLEN; | |
837 | ogm_offset += ntohs(ogm_packet->tvlv_len); | |
838 | ||
839 | packet_pos = skb->data + ogm_offset; | |
840 | ogm_packet = (struct batadv_ogm2_packet *)packet_pos; | |
841 | } | |
842 | ||
843 | ret = NET_RX_SUCCESS; | |
b91a2543 SE |
844 | |
845 | free_skb: | |
846 | if (ret == NET_RX_SUCCESS) | |
847 | consume_skb(skb); | |
848 | else | |
849 | kfree_skb(skb); | |
9323158e AQ |
850 | |
851 | return ret; | |
0da00359 AQ |
852 | } |
853 | ||
854 | /** | |
7e9a8c2c | 855 | * batadv_v_ogm_init() - initialise the OGM2 engine |
0da00359 AQ |
856 | * @bat_priv: the bat priv with all the soft interface information |
857 | * | |
858 | * Return: 0 on success or a negative error code in case of failure | |
859 | */ | |
860 | int batadv_v_ogm_init(struct batadv_priv *bat_priv) | |
861 | { | |
862 | struct batadv_ogm2_packet *ogm_packet; | |
863 | unsigned char *ogm_buff; | |
864 | u32 random_seqno; | |
865 | ||
866 | bat_priv->bat_v.ogm_buff_len = BATADV_OGM2_HLEN; | |
867 | ogm_buff = kzalloc(bat_priv->bat_v.ogm_buff_len, GFP_ATOMIC); | |
868 | if (!ogm_buff) | |
869 | return -ENOMEM; | |
870 | ||
871 | bat_priv->bat_v.ogm_buff = ogm_buff; | |
872 | ogm_packet = (struct batadv_ogm2_packet *)ogm_buff; | |
873 | ogm_packet->packet_type = BATADV_OGM2; | |
874 | ogm_packet->version = BATADV_COMPAT_VERSION; | |
875 | ogm_packet->ttl = BATADV_TTL; | |
876 | ogm_packet->flags = BATADV_NO_FLAGS; | |
877 | ogm_packet->throughput = htonl(BATADV_THROUGHPUT_MAX_VALUE); | |
878 | ||
879 | /* randomize initial seqno to avoid collision */ | |
880 | get_random_bytes(&random_seqno, sizeof(random_seqno)); | |
881 | atomic_set(&bat_priv->bat_v.ogm_seqno, random_seqno); | |
882 | INIT_DELAYED_WORK(&bat_priv->bat_v.ogm_wq, batadv_v_ogm_send); | |
883 | ||
884 | return 0; | |
885 | } | |
886 | ||
887 | /** | |
7e9a8c2c | 888 | * batadv_v_ogm_free() - free OGM private resources |
0da00359 AQ |
889 | * @bat_priv: the bat priv with all the soft interface information |
890 | */ | |
891 | void batadv_v_ogm_free(struct batadv_priv *bat_priv) | |
892 | { | |
893 | cancel_delayed_work_sync(&bat_priv->bat_v.ogm_wq); | |
894 | ||
895 | kfree(bat_priv->bat_v.ogm_buff); | |
896 | bat_priv->bat_v.ogm_buff = NULL; | |
897 | bat_priv->bat_v.ogm_buff_len = 0; | |
898 | } |