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ac79cbb9 | 1 | /* Copyright (C) 2013-2017 B.A.T.M.A.N. contributors: |
0da00359 AQ |
2 | * |
3 | * Antonio Quartulli | |
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_ogm.h" | |
19 | #include "main.h" | |
20 | ||
21 | #include <linux/atomic.h> | |
22 | #include <linux/byteorder/generic.h> | |
23 | #include <linux/errno.h> | |
24 | #include <linux/etherdevice.h> | |
25 | #include <linux/fs.h> | |
26 | #include <linux/if_ether.h> | |
27 | #include <linux/jiffies.h> | |
28 | #include <linux/kernel.h> | |
27353446 | 29 | #include <linux/kref.h> |
9323158e | 30 | #include <linux/list.h> |
0da00359 AQ |
31 | #include <linux/netdevice.h> |
32 | #include <linux/random.h> | |
33 | #include <linux/rculist.h> | |
34 | #include <linux/rcupdate.h> | |
35 | #include <linux/skbuff.h> | |
36 | #include <linux/slab.h> | |
37 | #include <linux/stddef.h> | |
38 | #include <linux/string.h> | |
39 | #include <linux/types.h> | |
40 | #include <linux/workqueue.h> | |
41 | ||
01d350d1 | 42 | #include "bat_algo.h" |
0da00359 | 43 | #include "hard-interface.h" |
9323158e | 44 | #include "hash.h" |
ba412080 | 45 | #include "log.h" |
9323158e | 46 | #include "originator.h" |
0da00359 AQ |
47 | #include "packet.h" |
48 | #include "routing.h" | |
49 | #include "send.h" | |
50 | #include "translation-table.h" | |
1f8dce49 | 51 | #include "tvlv.h" |
0da00359 | 52 | |
9323158e AQ |
53 | /** |
54 | * batadv_v_ogm_orig_get - retrieve and possibly create an originator node | |
55 | * @bat_priv: the bat priv with all the soft interface information | |
56 | * @addr: the address of the originator | |
57 | * | |
58 | * Return: the orig_node corresponding to the specified address. If such object | |
59 | * does not exist it is allocated here. In case of allocation failure returns | |
60 | * NULL. | |
61 | */ | |
62 | struct batadv_orig_node *batadv_v_ogm_orig_get(struct batadv_priv *bat_priv, | |
63 | const u8 *addr) | |
64 | { | |
65 | struct batadv_orig_node *orig_node; | |
66 | int hash_added; | |
67 | ||
68 | orig_node = batadv_orig_hash_find(bat_priv, addr); | |
69 | if (orig_node) | |
70 | return orig_node; | |
71 | ||
72 | orig_node = batadv_orig_node_new(bat_priv, addr); | |
73 | if (!orig_node) | |
74 | return NULL; | |
75 | ||
55db2d59 | 76 | kref_get(&orig_node->refcount); |
9323158e AQ |
77 | hash_added = batadv_hash_add(bat_priv->orig_hash, batadv_compare_orig, |
78 | batadv_choose_orig, orig_node, | |
79 | &orig_node->hash_entry); | |
80 | if (hash_added != 0) { | |
55db2d59 | 81 | /* remove refcnt for newly created orig_node and hash entry */ |
9323158e AQ |
82 | batadv_orig_node_put(orig_node); |
83 | batadv_orig_node_put(orig_node); | |
84 | orig_node = NULL; | |
85 | } | |
86 | ||
87 | return orig_node; | |
88 | } | |
89 | ||
0da00359 AQ |
90 | /** |
91 | * batadv_v_ogm_start_timer - restart the OGM sending timer | |
92 | * @bat_priv: the bat priv with all the soft interface information | |
93 | */ | |
94 | static void batadv_v_ogm_start_timer(struct batadv_priv *bat_priv) | |
95 | { | |
96 | unsigned long msecs; | |
97 | /* this function may be invoked in different contexts (ogm rescheduling | |
98 | * or hard_iface activation), but the work timer should not be reset | |
99 | */ | |
100 | if (delayed_work_pending(&bat_priv->bat_v.ogm_wq)) | |
101 | return; | |
102 | ||
103 | msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER; | |
104 | msecs += prandom_u32() % (2 * BATADV_JITTER); | |
105 | queue_delayed_work(batadv_event_workqueue, &bat_priv->bat_v.ogm_wq, | |
106 | msecs_to_jiffies(msecs)); | |
107 | } | |
108 | ||
109 | /** | |
110 | * batadv_v_ogm_send_to_if - send a batman ogm using a given interface | |
111 | * @skb: the OGM to send | |
112 | * @hard_iface: the interface to use to send the OGM | |
113 | */ | |
114 | static void batadv_v_ogm_send_to_if(struct sk_buff *skb, | |
115 | struct batadv_hard_iface *hard_iface) | |
116 | { | |
117 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); | |
118 | ||
119 | if (hard_iface->if_status != BATADV_IF_ACTIVE) | |
120 | return; | |
121 | ||
122 | batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX); | |
123 | batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES, | |
124 | skb->len + ETH_HLEN); | |
125 | ||
95d39278 | 126 | batadv_send_broadcast_skb(skb, hard_iface); |
0da00359 AQ |
127 | } |
128 | ||
129 | /** | |
130 | * batadv_v_ogm_send - periodic worker broadcasting the own OGM | |
131 | * @work: work queue item | |
132 | */ | |
133 | static void batadv_v_ogm_send(struct work_struct *work) | |
134 | { | |
135 | struct batadv_hard_iface *hard_iface; | |
136 | struct batadv_priv_bat_v *bat_v; | |
137 | struct batadv_priv *bat_priv; | |
138 | struct batadv_ogm2_packet *ogm_packet; | |
139 | struct sk_buff *skb, *skb_tmp; | |
e04de486 | 140 | unsigned char *ogm_buff; |
0da00359 AQ |
141 | int ogm_buff_len; |
142 | u16 tvlv_len = 0; | |
3111beed | 143 | int ret; |
0da00359 AQ |
144 | |
145 | bat_v = container_of(work, struct batadv_priv_bat_v, ogm_wq.work); | |
146 | bat_priv = container_of(bat_v, struct batadv_priv, bat_v); | |
147 | ||
148 | if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING) | |
149 | goto out; | |
150 | ||
151 | ogm_buff = bat_priv->bat_v.ogm_buff; | |
152 | ogm_buff_len = bat_priv->bat_v.ogm_buff_len; | |
153 | /* tt changes have to be committed before the tvlv data is | |
154 | * appended as it may alter the tt tvlv container | |
155 | */ | |
156 | batadv_tt_local_commit_changes(bat_priv); | |
157 | tvlv_len = batadv_tvlv_container_ogm_append(bat_priv, &ogm_buff, | |
158 | &ogm_buff_len, | |
159 | BATADV_OGM2_HLEN); | |
160 | ||
161 | bat_priv->bat_v.ogm_buff = ogm_buff; | |
162 | bat_priv->bat_v.ogm_buff_len = ogm_buff_len; | |
163 | ||
164 | skb = netdev_alloc_skb_ip_align(NULL, ETH_HLEN + ogm_buff_len); | |
165 | if (!skb) | |
166 | goto reschedule; | |
167 | ||
168 | skb_reserve(skb, ETH_HLEN); | |
e04de486 | 169 | skb_put_data(skb, ogm_buff, ogm_buff_len); |
0da00359 AQ |
170 | |
171 | ogm_packet = (struct batadv_ogm2_packet *)skb->data; | |
172 | ogm_packet->seqno = htonl(atomic_read(&bat_priv->bat_v.ogm_seqno)); | |
173 | atomic_inc(&bat_priv->bat_v.ogm_seqno); | |
174 | ogm_packet->tvlv_len = htons(tvlv_len); | |
175 | ||
176 | /* broadcast on every interface */ | |
177 | rcu_read_lock(); | |
178 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { | |
179 | if (hard_iface->soft_iface != bat_priv->soft_iface) | |
180 | continue; | |
181 | ||
27353446 SE |
182 | if (!kref_get_unless_zero(&hard_iface->refcount)) |
183 | continue; | |
184 | ||
3111beed LL |
185 | ret = batadv_hardif_no_broadcast(hard_iface, NULL, NULL); |
186 | if (ret) { | |
187 | char *type; | |
188 | ||
189 | switch (ret) { | |
190 | case BATADV_HARDIF_BCAST_NORECIPIENT: | |
191 | type = "no neighbor"; | |
192 | break; | |
193 | case BATADV_HARDIF_BCAST_DUPFWD: | |
194 | type = "single neighbor is source"; | |
195 | break; | |
196 | case BATADV_HARDIF_BCAST_DUPORIG: | |
197 | type = "single neighbor is originator"; | |
198 | break; | |
199 | default: | |
200 | type = "unknown"; | |
201 | } | |
202 | ||
f25cbb2a | 203 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "OGM2 from ourselves on %s suppressed: %s\n", |
3111beed LL |
204 | hard_iface->net_dev->name, type); |
205 | ||
206 | batadv_hardif_put(hard_iface); | |
207 | continue; | |
208 | } | |
209 | ||
0da00359 AQ |
210 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
211 | "Sending own OGM2 packet (originator %pM, seqno %u, throughput %u, TTL %d) on interface %s [%pM]\n", | |
212 | ogm_packet->orig, ntohl(ogm_packet->seqno), | |
213 | ntohl(ogm_packet->throughput), ogm_packet->ttl, | |
214 | hard_iface->net_dev->name, | |
215 | hard_iface->net_dev->dev_addr); | |
216 | ||
217 | /* this skb gets consumed by batadv_v_ogm_send_to_if() */ | |
218 | skb_tmp = skb_clone(skb, GFP_ATOMIC); | |
27353446 SE |
219 | if (!skb_tmp) { |
220 | batadv_hardif_put(hard_iface); | |
0da00359 | 221 | break; |
27353446 | 222 | } |
0da00359 AQ |
223 | |
224 | batadv_v_ogm_send_to_if(skb_tmp, hard_iface); | |
27353446 | 225 | batadv_hardif_put(hard_iface); |
0da00359 AQ |
226 | } |
227 | rcu_read_unlock(); | |
228 | ||
229 | consume_skb(skb); | |
230 | ||
231 | reschedule: | |
232 | batadv_v_ogm_start_timer(bat_priv); | |
233 | out: | |
234 | return; | |
235 | } | |
236 | ||
237 | /** | |
238 | * batadv_v_ogm_iface_enable - prepare an interface for B.A.T.M.A.N. V | |
239 | * @hard_iface: the interface to prepare | |
240 | * | |
241 | * Takes care of scheduling own OGM sending routine for this interface. | |
242 | * | |
243 | * Return: 0 on success or a negative error code otherwise | |
244 | */ | |
245 | int batadv_v_ogm_iface_enable(struct batadv_hard_iface *hard_iface) | |
246 | { | |
247 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); | |
248 | ||
249 | batadv_v_ogm_start_timer(bat_priv); | |
250 | ||
251 | return 0; | |
252 | } | |
253 | ||
254 | /** | |
255 | * batadv_v_ogm_primary_iface_set - set a new primary interface | |
256 | * @primary_iface: the new primary interface | |
257 | */ | |
258 | void batadv_v_ogm_primary_iface_set(struct batadv_hard_iface *primary_iface) | |
259 | { | |
260 | struct batadv_priv *bat_priv = netdev_priv(primary_iface->soft_iface); | |
261 | struct batadv_ogm2_packet *ogm_packet; | |
262 | ||
263 | if (!bat_priv->bat_v.ogm_buff) | |
264 | return; | |
265 | ||
266 | ogm_packet = (struct batadv_ogm2_packet *)bat_priv->bat_v.ogm_buff; | |
267 | ether_addr_copy(ogm_packet->orig, primary_iface->net_dev->dev_addr); | |
268 | } | |
269 | ||
9323158e AQ |
270 | /** |
271 | * batadv_v_forward_penalty - apply a penalty to the throughput metric forwarded | |
272 | * with B.A.T.M.A.N. V OGMs | |
273 | * @bat_priv: the bat priv with all the soft interface information | |
274 | * @if_incoming: the interface where the OGM has been received | |
275 | * @if_outgoing: the interface where the OGM has to be forwarded to | |
276 | * @throughput: the current throughput | |
277 | * | |
278 | * Apply a penalty on the current throughput metric value based on the | |
279 | * characteristic of the interface where the OGM has been received. The return | |
280 | * value is computed as follows: | |
281 | * - throughput * 50% if the incoming and outgoing interface are the | |
282 | * same WiFi interface and the throughput is above | |
283 | * 1MBit/s | |
284 | * - throughput if the outgoing interface is the default | |
285 | * interface (i.e. this OGM is processed for the | |
286 | * internal table and not forwarded) | |
287 | * - throughput * hop penalty otherwise | |
288 | * | |
289 | * Return: the penalised throughput metric. | |
290 | */ | |
291 | static u32 batadv_v_forward_penalty(struct batadv_priv *bat_priv, | |
292 | struct batadv_hard_iface *if_incoming, | |
293 | struct batadv_hard_iface *if_outgoing, | |
294 | u32 throughput) | |
295 | { | |
296 | int hop_penalty = atomic_read(&bat_priv->hop_penalty); | |
297 | int hop_penalty_max = BATADV_TQ_MAX_VALUE; | |
298 | ||
299 | /* Don't apply hop penalty in default originator table. */ | |
300 | if (if_outgoing == BATADV_IF_DEFAULT) | |
301 | return throughput; | |
302 | ||
303 | /* Forwarding on the same WiFi interface cuts the throughput in half | |
304 | * due to the store & forward characteristics of WIFI. | |
305 | * Very low throughput values are the exception. | |
306 | */ | |
307 | if ((throughput > 10) && | |
308 | (if_incoming == if_outgoing) && | |
c833484e | 309 | !(if_incoming->bat_v.flags & BATADV_FULL_DUPLEX)) |
9323158e AQ |
310 | return throughput / 2; |
311 | ||
312 | /* hop penalty of 255 equals 100% */ | |
313 | return throughput * (hop_penalty_max - hop_penalty) / hop_penalty_max; | |
314 | } | |
315 | ||
316 | /** | |
efcc9d30 SW |
317 | * batadv_v_ogm_forward - check conditions and forward an OGM to the given |
318 | * outgoing interface | |
9323158e AQ |
319 | * @bat_priv: the bat priv with all the soft interface information |
320 | * @ogm_received: previously received OGM to be forwarded | |
efcc9d30 SW |
321 | * @orig_node: the originator which has been updated |
322 | * @neigh_node: the neigh_node through with the OGM has been received | |
9323158e AQ |
323 | * @if_incoming: the interface on which this OGM was received on |
324 | * @if_outgoing: the interface to which the OGM has to be forwarded to | |
325 | * | |
326 | * Forward an OGM to an interface after having altered the throughput metric and | |
327 | * the TTL value contained in it. The original OGM isn't modified. | |
328 | */ | |
329 | static void batadv_v_ogm_forward(struct batadv_priv *bat_priv, | |
330 | const struct batadv_ogm2_packet *ogm_received, | |
efcc9d30 SW |
331 | struct batadv_orig_node *orig_node, |
332 | struct batadv_neigh_node *neigh_node, | |
9323158e AQ |
333 | struct batadv_hard_iface *if_incoming, |
334 | struct batadv_hard_iface *if_outgoing) | |
335 | { | |
efcc9d30 SW |
336 | struct batadv_neigh_ifinfo *neigh_ifinfo = NULL; |
337 | struct batadv_orig_ifinfo *orig_ifinfo = NULL; | |
338 | struct batadv_neigh_node *router = NULL; | |
9323158e AQ |
339 | struct batadv_ogm2_packet *ogm_forward; |
340 | unsigned char *skb_buff; | |
341 | struct sk_buff *skb; | |
342 | size_t packet_len; | |
343 | u16 tvlv_len; | |
344 | ||
efcc9d30 SW |
345 | /* only forward for specific interfaces, not for the default one. */ |
346 | if (if_outgoing == BATADV_IF_DEFAULT) | |
347 | goto out; | |
348 | ||
349 | orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing); | |
350 | if (!orig_ifinfo) | |
351 | goto out; | |
352 | ||
353 | /* acquire possibly updated router */ | |
354 | router = batadv_orig_router_get(orig_node, if_outgoing); | |
355 | ||
356 | /* strict rule: forward packets coming from the best next hop only */ | |
357 | if (neigh_node != router) | |
358 | goto out; | |
359 | ||
360 | /* don't forward the same seqno twice on one interface */ | |
361 | if (orig_ifinfo->last_seqno_forwarded == ntohl(ogm_received->seqno)) | |
362 | goto out; | |
363 | ||
364 | orig_ifinfo->last_seqno_forwarded = ntohl(ogm_received->seqno); | |
365 | ||
9323158e AQ |
366 | if (ogm_received->ttl <= 1) { |
367 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n"); | |
efcc9d30 | 368 | goto out; |
9323158e AQ |
369 | } |
370 | ||
efcc9d30 SW |
371 | neigh_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing); |
372 | if (!neigh_ifinfo) | |
373 | goto out; | |
374 | ||
9323158e AQ |
375 | tvlv_len = ntohs(ogm_received->tvlv_len); |
376 | ||
377 | packet_len = BATADV_OGM2_HLEN + tvlv_len; | |
378 | skb = netdev_alloc_skb_ip_align(if_outgoing->net_dev, | |
379 | ETH_HLEN + packet_len); | |
380 | if (!skb) | |
efcc9d30 | 381 | goto out; |
9323158e AQ |
382 | |
383 | skb_reserve(skb, ETH_HLEN); | |
59ae1d12 | 384 | skb_buff = skb_put_data(skb, ogm_received, packet_len); |
9323158e AQ |
385 | |
386 | /* apply forward penalty */ | |
387 | ogm_forward = (struct batadv_ogm2_packet *)skb_buff; | |
efcc9d30 | 388 | ogm_forward->throughput = htonl(neigh_ifinfo->bat_v.throughput); |
9323158e AQ |
389 | ogm_forward->ttl--; |
390 | ||
391 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
392 | "Forwarding OGM2 packet on %s: throughput %u, ttl %u, received via %s\n", | |
efcc9d30 SW |
393 | if_outgoing->net_dev->name, ntohl(ogm_forward->throughput), |
394 | ogm_forward->ttl, if_incoming->net_dev->name); | |
9323158e AQ |
395 | |
396 | batadv_v_ogm_send_to_if(skb, if_outgoing); | |
efcc9d30 SW |
397 | |
398 | out: | |
399 | if (orig_ifinfo) | |
400 | batadv_orig_ifinfo_put(orig_ifinfo); | |
401 | if (router) | |
402 | batadv_neigh_node_put(router); | |
403 | if (neigh_ifinfo) | |
404 | batadv_neigh_ifinfo_put(neigh_ifinfo); | |
9323158e AQ |
405 | } |
406 | ||
407 | /** | |
408 | * batadv_v_ogm_metric_update - update route metric based on OGM | |
409 | * @bat_priv: the bat priv with all the soft interface information | |
410 | * @ogm2: OGM2 structure | |
411 | * @orig_node: Originator structure for which the OGM has been received | |
412 | * @neigh_node: the neigh_node through with the OGM has been received | |
413 | * @if_incoming: the interface where this packet was received | |
414 | * @if_outgoing: the interface for which the packet should be considered | |
415 | * | |
416 | * Return: | |
417 | * 1 if the OGM is new, | |
418 | * 0 if it is not new but valid, | |
419 | * <0 on error (e.g. old OGM) | |
420 | */ | |
421 | static int batadv_v_ogm_metric_update(struct batadv_priv *bat_priv, | |
422 | const struct batadv_ogm2_packet *ogm2, | |
423 | struct batadv_orig_node *orig_node, | |
424 | struct batadv_neigh_node *neigh_node, | |
425 | struct batadv_hard_iface *if_incoming, | |
426 | struct batadv_hard_iface *if_outgoing) | |
427 | { | |
422d2f77 | 428 | struct batadv_orig_ifinfo *orig_ifinfo; |
9323158e AQ |
429 | struct batadv_neigh_ifinfo *neigh_ifinfo = NULL; |
430 | bool protection_started = false; | |
431 | int ret = -EINVAL; | |
432 | u32 path_throughput; | |
433 | s32 seq_diff; | |
434 | ||
435 | orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing); | |
436 | if (!orig_ifinfo) | |
437 | goto out; | |
438 | ||
439 | seq_diff = ntohl(ogm2->seqno) - orig_ifinfo->last_real_seqno; | |
440 | ||
441 | if (!hlist_empty(&orig_node->neigh_list) && | |
442 | batadv_window_protected(bat_priv, seq_diff, | |
443 | BATADV_OGM_MAX_AGE, | |
444 | &orig_ifinfo->batman_seqno_reset, | |
445 | &protection_started)) { | |
446 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
447 | "Drop packet: packet within window protection time from %pM\n", | |
448 | ogm2->orig); | |
449 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
450 | "Last reset: %ld, %ld\n", | |
451 | orig_ifinfo->batman_seqno_reset, jiffies); | |
452 | goto out; | |
453 | } | |
454 | ||
455 | /* drop packets with old seqnos, however accept the first packet after | |
456 | * a host has been rebooted. | |
457 | */ | |
458 | if ((seq_diff < 0) && !protection_started) | |
459 | goto out; | |
460 | ||
461 | neigh_node->last_seen = jiffies; | |
462 | ||
463 | orig_node->last_seen = jiffies; | |
464 | ||
465 | orig_ifinfo->last_real_seqno = ntohl(ogm2->seqno); | |
466 | orig_ifinfo->last_ttl = ogm2->ttl; | |
467 | ||
468 | neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing); | |
469 | if (!neigh_ifinfo) | |
470 | goto out; | |
471 | ||
472 | path_throughput = batadv_v_forward_penalty(bat_priv, if_incoming, | |
473 | if_outgoing, | |
474 | ntohl(ogm2->throughput)); | |
475 | neigh_ifinfo->bat_v.throughput = path_throughput; | |
476 | neigh_ifinfo->bat_v.last_seqno = ntohl(ogm2->seqno); | |
477 | neigh_ifinfo->last_ttl = ogm2->ttl; | |
478 | ||
479 | if (seq_diff > 0 || protection_started) | |
480 | ret = 1; | |
481 | else | |
482 | ret = 0; | |
483 | out: | |
484 | if (orig_ifinfo) | |
485 | batadv_orig_ifinfo_put(orig_ifinfo); | |
486 | if (neigh_ifinfo) | |
487 | batadv_neigh_ifinfo_put(neigh_ifinfo); | |
488 | ||
489 | return ret; | |
490 | } | |
491 | ||
492 | /** | |
493 | * batadv_v_ogm_route_update - update routes based on OGM | |
494 | * @bat_priv: the bat priv with all the soft interface information | |
495 | * @ethhdr: the Ethernet header of the OGM2 | |
496 | * @ogm2: OGM2 structure | |
497 | * @orig_node: Originator structure for which the OGM has been received | |
498 | * @neigh_node: the neigh_node through with the OGM has been received | |
499 | * @if_incoming: the interface where this packet was received | |
500 | * @if_outgoing: the interface for which the packet should be considered | |
efcc9d30 SW |
501 | * |
502 | * Return: true if the packet should be forwarded, false otherwise | |
9323158e | 503 | */ |
efcc9d30 | 504 | static bool batadv_v_ogm_route_update(struct batadv_priv *bat_priv, |
9323158e AQ |
505 | const struct ethhdr *ethhdr, |
506 | const struct batadv_ogm2_packet *ogm2, | |
507 | struct batadv_orig_node *orig_node, | |
508 | struct batadv_neigh_node *neigh_node, | |
509 | struct batadv_hard_iface *if_incoming, | |
510 | struct batadv_hard_iface *if_outgoing) | |
511 | { | |
512 | struct batadv_neigh_node *router = NULL; | |
422d2f77 | 513 | struct batadv_orig_node *orig_neigh_node; |
9323158e | 514 | struct batadv_neigh_node *orig_neigh_router = NULL; |
86de37c1 SW |
515 | struct batadv_neigh_ifinfo *router_ifinfo = NULL, *neigh_ifinfo = NULL; |
516 | u32 router_throughput, neigh_throughput; | |
517 | u32 router_last_seqno; | |
518 | u32 neigh_last_seqno; | |
519 | s32 neigh_seq_diff; | |
efcc9d30 | 520 | bool forward = false; |
9323158e AQ |
521 | |
522 | orig_neigh_node = batadv_v_ogm_orig_get(bat_priv, ethhdr->h_source); | |
523 | if (!orig_neigh_node) | |
524 | goto out; | |
525 | ||
526 | orig_neigh_router = batadv_orig_router_get(orig_neigh_node, | |
527 | if_outgoing); | |
528 | ||
529 | /* drop packet if sender is not a direct neighbor and if we | |
530 | * don't route towards it | |
531 | */ | |
532 | router = batadv_orig_router_get(orig_node, if_outgoing); | |
533 | if (router && router->orig_node != orig_node && !orig_neigh_router) { | |
534 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
535 | "Drop packet: OGM via unknown neighbor!\n"); | |
536 | goto out; | |
537 | } | |
538 | ||
86de37c1 SW |
539 | /* Mark the OGM to be considered for forwarding, and update routes |
540 | * if needed. | |
541 | */ | |
efcc9d30 | 542 | forward = true; |
86de37c1 SW |
543 | |
544 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
545 | "Searching and updating originator entry of received packet\n"); | |
546 | ||
547 | /* if this neighbor already is our next hop there is nothing | |
548 | * to change | |
549 | */ | |
550 | if (router == neigh_node) | |
551 | goto out; | |
552 | ||
553 | /* don't consider neighbours with worse throughput. | |
554 | * also switch route if this seqno is BATADV_V_MAX_ORIGDIFF newer than | |
555 | * the last received seqno from our best next hop. | |
556 | */ | |
557 | if (router) { | |
558 | router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing); | |
559 | neigh_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing); | |
560 | ||
561 | /* if these are not allocated, something is wrong. */ | |
562 | if (!router_ifinfo || !neigh_ifinfo) | |
563 | goto out; | |
564 | ||
565 | neigh_last_seqno = neigh_ifinfo->bat_v.last_seqno; | |
566 | router_last_seqno = router_ifinfo->bat_v.last_seqno; | |
567 | neigh_seq_diff = neigh_last_seqno - router_last_seqno; | |
568 | router_throughput = router_ifinfo->bat_v.throughput; | |
569 | neigh_throughput = neigh_ifinfo->bat_v.throughput; | |
570 | ||
571 | if ((neigh_seq_diff < BATADV_OGM_MAX_ORIGDIFF) && | |
572 | (router_throughput >= neigh_throughput)) | |
573 | goto out; | |
574 | } | |
575 | ||
576 | batadv_update_route(bat_priv, orig_node, if_outgoing, neigh_node); | |
9323158e | 577 | out: |
9323158e AQ |
578 | if (router) |
579 | batadv_neigh_node_put(router); | |
580 | if (orig_neigh_router) | |
581 | batadv_neigh_node_put(orig_neigh_router); | |
582 | if (orig_neigh_node) | |
583 | batadv_orig_node_put(orig_neigh_node); | |
86de37c1 SW |
584 | if (router_ifinfo) |
585 | batadv_neigh_ifinfo_put(router_ifinfo); | |
586 | if (neigh_ifinfo) | |
587 | batadv_neigh_ifinfo_put(neigh_ifinfo); | |
efcc9d30 SW |
588 | |
589 | return forward; | |
9323158e AQ |
590 | } |
591 | ||
592 | /** | |
593 | * batadv_v_ogm_process_per_outif - process a batman v OGM for an outgoing if | |
594 | * @bat_priv: the bat priv with all the soft interface information | |
595 | * @ethhdr: the Ethernet header of the OGM2 | |
596 | * @ogm2: OGM2 structure | |
597 | * @orig_node: Originator structure for which the OGM has been received | |
598 | * @neigh_node: the neigh_node through with the OGM has been received | |
599 | * @if_incoming: the interface where this packet was received | |
600 | * @if_outgoing: the interface for which the packet should be considered | |
601 | */ | |
602 | static void | |
603 | batadv_v_ogm_process_per_outif(struct batadv_priv *bat_priv, | |
604 | const struct ethhdr *ethhdr, | |
605 | const struct batadv_ogm2_packet *ogm2, | |
606 | struct batadv_orig_node *orig_node, | |
607 | struct batadv_neigh_node *neigh_node, | |
608 | struct batadv_hard_iface *if_incoming, | |
609 | struct batadv_hard_iface *if_outgoing) | |
610 | { | |
611 | int seqno_age; | |
efcc9d30 | 612 | bool forward; |
9323158e AQ |
613 | |
614 | /* first, update the metric with according sanity checks */ | |
615 | seqno_age = batadv_v_ogm_metric_update(bat_priv, ogm2, orig_node, | |
616 | neigh_node, if_incoming, | |
617 | if_outgoing); | |
618 | ||
619 | /* outdated sequence numbers are to be discarded */ | |
620 | if (seqno_age < 0) | |
621 | return; | |
622 | ||
623 | /* only unknown & newer OGMs contain TVLVs we are interested in */ | |
624 | if ((seqno_age > 0) && (if_outgoing == BATADV_IF_DEFAULT)) | |
625 | batadv_tvlv_containers_process(bat_priv, true, orig_node, | |
626 | NULL, NULL, | |
627 | (unsigned char *)(ogm2 + 1), | |
628 | ntohs(ogm2->tvlv_len)); | |
629 | ||
630 | /* if the metric update went through, update routes if needed */ | |
efcc9d30 SW |
631 | forward = batadv_v_ogm_route_update(bat_priv, ethhdr, ogm2, orig_node, |
632 | neigh_node, if_incoming, | |
633 | if_outgoing); | |
634 | ||
635 | /* if the routes have been processed correctly, check and forward */ | |
636 | if (forward) | |
637 | batadv_v_ogm_forward(bat_priv, ogm2, orig_node, neigh_node, | |
638 | if_incoming, if_outgoing); | |
9323158e AQ |
639 | } |
640 | ||
641 | /** | |
642 | * batadv_v_ogm_aggr_packet - checks if there is another OGM aggregated | |
643 | * @buff_pos: current position in the skb | |
644 | * @packet_len: total length of the skb | |
645 | * @tvlv_len: tvlv length of the previously considered OGM | |
646 | * | |
647 | * Return: true if there is enough space for another OGM, false otherwise. | |
648 | */ | |
649 | static bool batadv_v_ogm_aggr_packet(int buff_pos, int packet_len, | |
650 | __be16 tvlv_len) | |
651 | { | |
652 | int next_buff_pos = 0; | |
653 | ||
654 | next_buff_pos += buff_pos + BATADV_OGM2_HLEN; | |
655 | next_buff_pos += ntohs(tvlv_len); | |
656 | ||
657 | return (next_buff_pos <= packet_len) && | |
658 | (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES); | |
659 | } | |
660 | ||
661 | /** | |
662 | * batadv_v_ogm_process - process an incoming batman v OGM | |
663 | * @skb: the skb containing the OGM | |
664 | * @ogm_offset: offset to the OGM which should be processed (for aggregates) | |
665 | * @if_incoming: the interface where this packet was receved | |
666 | */ | |
667 | static void batadv_v_ogm_process(const struct sk_buff *skb, int ogm_offset, | |
668 | struct batadv_hard_iface *if_incoming) | |
669 | { | |
670 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); | |
671 | struct ethhdr *ethhdr; | |
672 | struct batadv_orig_node *orig_node = NULL; | |
673 | struct batadv_hardif_neigh_node *hardif_neigh = NULL; | |
674 | struct batadv_neigh_node *neigh_node = NULL; | |
675 | struct batadv_hard_iface *hard_iface; | |
676 | struct batadv_ogm2_packet *ogm_packet; | |
677 | u32 ogm_throughput, link_throughput, path_throughput; | |
3111beed | 678 | int ret; |
9323158e AQ |
679 | |
680 | ethhdr = eth_hdr(skb); | |
681 | ogm_packet = (struct batadv_ogm2_packet *)(skb->data + ogm_offset); | |
682 | ||
683 | ogm_throughput = ntohl(ogm_packet->throughput); | |
684 | ||
685 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
f25cbb2a | 686 | "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 |
687 | ethhdr->h_source, if_incoming->net_dev->name, |
688 | if_incoming->net_dev->dev_addr, ogm_packet->orig, | |
689 | ntohl(ogm_packet->seqno), ogm_throughput, ogm_packet->ttl, | |
690 | ogm_packet->version, ntohs(ogm_packet->tvlv_len)); | |
691 | ||
f25cbb2a CIK |
692 | /* If the throughput metric is 0, immediately drop the packet. No need |
693 | * to create orig_node / neigh_node for an unusable route. | |
9323158e AQ |
694 | */ |
695 | if (ogm_throughput == 0) { | |
696 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
f25cbb2a | 697 | "Drop packet: originator packet with throughput metric of 0\n"); |
9323158e AQ |
698 | return; |
699 | } | |
700 | ||
701 | /* require ELP packets be to received from this neighbor first */ | |
702 | hardif_neigh = batadv_hardif_neigh_get(if_incoming, ethhdr->h_source); | |
703 | if (!hardif_neigh) { | |
704 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
705 | "Drop packet: OGM via unknown neighbor!\n"); | |
706 | goto out; | |
707 | } | |
708 | ||
709 | orig_node = batadv_v_ogm_orig_get(bat_priv, ogm_packet->orig); | |
710 | if (!orig_node) | |
711 | return; | |
712 | ||
6f0a6b5e ML |
713 | neigh_node = batadv_neigh_node_get_or_create(orig_node, if_incoming, |
714 | ethhdr->h_source); | |
9323158e AQ |
715 | if (!neigh_node) |
716 | goto out; | |
717 | ||
718 | /* Update the received throughput metric to match the link | |
719 | * characteristic: | |
720 | * - If this OGM traveled one hop so far (emitted by single hop | |
721 | * neighbor) the path throughput metric equals the link throughput. | |
722 | * - For OGMs traversing more than hop the path throughput metric is | |
723 | * the smaller of the path throughput and the link throughput. | |
724 | */ | |
725 | link_throughput = ewma_throughput_read(&hardif_neigh->bat_v.throughput); | |
726 | path_throughput = min_t(u32, link_throughput, ogm_throughput); | |
727 | ogm_packet->throughput = htonl(path_throughput); | |
728 | ||
729 | batadv_v_ogm_process_per_outif(bat_priv, ethhdr, ogm_packet, orig_node, | |
730 | neigh_node, if_incoming, | |
731 | BATADV_IF_DEFAULT); | |
732 | ||
733 | rcu_read_lock(); | |
734 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { | |
735 | if (hard_iface->if_status != BATADV_IF_ACTIVE) | |
736 | continue; | |
737 | ||
738 | if (hard_iface->soft_iface != bat_priv->soft_iface) | |
739 | continue; | |
740 | ||
27353446 SE |
741 | if (!kref_get_unless_zero(&hard_iface->refcount)) |
742 | continue; | |
743 | ||
3111beed LL |
744 | ret = batadv_hardif_no_broadcast(hard_iface, |
745 | ogm_packet->orig, | |
746 | hardif_neigh->orig); | |
747 | ||
748 | if (ret) { | |
749 | char *type; | |
750 | ||
751 | switch (ret) { | |
752 | case BATADV_HARDIF_BCAST_NORECIPIENT: | |
753 | type = "no neighbor"; | |
754 | break; | |
755 | case BATADV_HARDIF_BCAST_DUPFWD: | |
756 | type = "single neighbor is source"; | |
757 | break; | |
758 | case BATADV_HARDIF_BCAST_DUPORIG: | |
759 | type = "single neighbor is originator"; | |
760 | break; | |
761 | default: | |
762 | type = "unknown"; | |
763 | } | |
764 | ||
f25cbb2a | 765 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "OGM2 packet from %pM on %s suppressed: %s\n", |
3111beed LL |
766 | ogm_packet->orig, hard_iface->net_dev->name, |
767 | type); | |
768 | ||
769 | batadv_hardif_put(hard_iface); | |
770 | continue; | |
771 | } | |
772 | ||
9323158e AQ |
773 | batadv_v_ogm_process_per_outif(bat_priv, ethhdr, ogm_packet, |
774 | orig_node, neigh_node, | |
775 | if_incoming, hard_iface); | |
27353446 SE |
776 | |
777 | batadv_hardif_put(hard_iface); | |
9323158e AQ |
778 | } |
779 | rcu_read_unlock(); | |
780 | out: | |
781 | if (orig_node) | |
782 | batadv_orig_node_put(orig_node); | |
783 | if (neigh_node) | |
784 | batadv_neigh_node_put(neigh_node); | |
785 | if (hardif_neigh) | |
786 | batadv_hardif_neigh_put(hardif_neigh); | |
787 | } | |
788 | ||
0da00359 AQ |
789 | /** |
790 | * batadv_v_ogm_packet_recv - OGM2 receiving handler | |
791 | * @skb: the received OGM | |
792 | * @if_incoming: the interface where this OGM has been received | |
793 | * | |
794 | * Return: NET_RX_SUCCESS and consume the skb on success or returns NET_RX_DROP | |
795 | * (without freeing the skb) on failure | |
796 | */ | |
797 | int batadv_v_ogm_packet_recv(struct sk_buff *skb, | |
798 | struct batadv_hard_iface *if_incoming) | |
799 | { | |
800 | struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); | |
801 | struct batadv_ogm2_packet *ogm_packet; | |
802 | struct ethhdr *ethhdr = eth_hdr(skb); | |
9323158e AQ |
803 | int ogm_offset; |
804 | u8 *packet_pos; | |
805 | int ret = NET_RX_DROP; | |
0da00359 AQ |
806 | |
807 | /* did we receive a OGM2 packet on an interface that does not have | |
808 | * B.A.T.M.A.N. V enabled ? | |
809 | */ | |
29824a55 | 810 | if (strcmp(bat_priv->algo_ops->name, "BATMAN_V") != 0) |
b91a2543 | 811 | goto free_skb; |
0da00359 AQ |
812 | |
813 | if (!batadv_check_management_packet(skb, if_incoming, BATADV_OGM2_HLEN)) | |
b91a2543 | 814 | goto free_skb; |
0da00359 AQ |
815 | |
816 | if (batadv_is_my_mac(bat_priv, ethhdr->h_source)) | |
b91a2543 | 817 | goto free_skb; |
0da00359 AQ |
818 | |
819 | ogm_packet = (struct batadv_ogm2_packet *)skb->data; | |
820 | ||
821 | if (batadv_is_my_mac(bat_priv, ogm_packet->orig)) | |
b91a2543 | 822 | goto free_skb; |
0da00359 AQ |
823 | |
824 | batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX); | |
825 | batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES, | |
826 | skb->len + ETH_HLEN); | |
827 | ||
9323158e AQ |
828 | ogm_offset = 0; |
829 | ogm_packet = (struct batadv_ogm2_packet *)skb->data; | |
830 | ||
831 | while (batadv_v_ogm_aggr_packet(ogm_offset, skb_headlen(skb), | |
832 | ogm_packet->tvlv_len)) { | |
833 | batadv_v_ogm_process(skb, ogm_offset, if_incoming); | |
834 | ||
835 | ogm_offset += BATADV_OGM2_HLEN; | |
836 | ogm_offset += ntohs(ogm_packet->tvlv_len); | |
837 | ||
838 | packet_pos = skb->data + ogm_offset; | |
839 | ogm_packet = (struct batadv_ogm2_packet *)packet_pos; | |
840 | } | |
841 | ||
842 | ret = NET_RX_SUCCESS; | |
b91a2543 SE |
843 | |
844 | free_skb: | |
845 | if (ret == NET_RX_SUCCESS) | |
846 | consume_skb(skb); | |
847 | else | |
848 | kfree_skb(skb); | |
9323158e AQ |
849 | |
850 | return ret; | |
0da00359 AQ |
851 | } |
852 | ||
853 | /** | |
854 | * batadv_v_ogm_init - initialise the OGM2 engine | |
855 | * @bat_priv: the bat priv with all the soft interface information | |
856 | * | |
857 | * Return: 0 on success or a negative error code in case of failure | |
858 | */ | |
859 | int batadv_v_ogm_init(struct batadv_priv *bat_priv) | |
860 | { | |
861 | struct batadv_ogm2_packet *ogm_packet; | |
862 | unsigned char *ogm_buff; | |
863 | u32 random_seqno; | |
864 | ||
865 | bat_priv->bat_v.ogm_buff_len = BATADV_OGM2_HLEN; | |
866 | ogm_buff = kzalloc(bat_priv->bat_v.ogm_buff_len, GFP_ATOMIC); | |
867 | if (!ogm_buff) | |
868 | return -ENOMEM; | |
869 | ||
870 | bat_priv->bat_v.ogm_buff = ogm_buff; | |
871 | ogm_packet = (struct batadv_ogm2_packet *)ogm_buff; | |
872 | ogm_packet->packet_type = BATADV_OGM2; | |
873 | ogm_packet->version = BATADV_COMPAT_VERSION; | |
874 | ogm_packet->ttl = BATADV_TTL; | |
875 | ogm_packet->flags = BATADV_NO_FLAGS; | |
876 | ogm_packet->throughput = htonl(BATADV_THROUGHPUT_MAX_VALUE); | |
877 | ||
878 | /* randomize initial seqno to avoid collision */ | |
879 | get_random_bytes(&random_seqno, sizeof(random_seqno)); | |
880 | atomic_set(&bat_priv->bat_v.ogm_seqno, random_seqno); | |
881 | INIT_DELAYED_WORK(&bat_priv->bat_v.ogm_wq, batadv_v_ogm_send); | |
882 | ||
883 | return 0; | |
884 | } | |
885 | ||
886 | /** | |
887 | * batadv_v_ogm_free - free OGM private resources | |
888 | * @bat_priv: the bat priv with all the soft interface information | |
889 | */ | |
890 | void batadv_v_ogm_free(struct batadv_priv *bat_priv) | |
891 | { | |
892 | cancel_delayed_work_sync(&bat_priv->bat_v.ogm_wq); | |
893 | ||
894 | kfree(bat_priv->bat_v.ogm_buff); | |
895 | bat_priv->bat_v.ogm_buff = NULL; | |
896 | bat_priv->bat_v.ogm_buff_len = 0; | |
897 | } |