blob: e79f6f01182eb6731927aea1bc0cba553fb600ff [file] [log] [blame]
Linus Luessingd6f94d92016-01-16 16:40:09 +08001/* Copyright (C) 2013-2016 B.A.T.M.A.N. contributors:
2 *
3 * Linus Lüssing, Marek Lindner
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of version 2 of the GNU General Public
7 * License as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, see <http://www.gnu.org/licenses/>.
16 */
17
Sven Eckelmanna2d08162016-05-15 11:07:46 +020018#include "bat_v.h"
Linus Luessingd6f94d92016-01-16 16:40:09 +080019#include "main.h"
20
Antonio Quartulli0b5ecc62016-01-16 16:40:14 +080021#include <linux/atomic.h>
Antonio Quartulli97869062016-01-16 16:40:17 +080022#include <linux/bug.h>
Linus Luessingd6f94d92016-01-16 16:40:09 +080023#include <linux/cache.h>
Antonio Quartulli08686942016-07-03 12:46:32 +020024#include <linux/errno.h>
Matthias Schifferf02a4782016-07-03 13:31:41 +020025#include <linux/if_ether.h>
Linus Luessingd6f94d92016-01-16 16:40:09 +080026#include <linux/init.h>
Antonio Quartulli261e2642016-01-16 16:40:18 +080027#include <linux/jiffies.h>
Antonio Quartulli08686942016-07-03 12:46:32 +020028#include <linux/kernel.h>
Antonio Quartulli50164d82016-07-03 12:46:34 +020029#include <linux/kref.h>
Antonio Quartulli261e2642016-01-16 16:40:18 +080030#include <linux/netdevice.h>
Matthias Schifferf02a4782016-07-03 13:31:41 +020031#include <linux/netlink.h>
Antonio Quartulli261e2642016-01-16 16:40:18 +080032#include <linux/rculist.h>
33#include <linux/rcupdate.h>
34#include <linux/seq_file.h>
Sven Eckelmanna45e9322016-05-06 11:43:38 +020035#include <linux/stddef.h>
Antonio Quartulli97869062016-01-16 16:40:17 +080036#include <linux/types.h>
Antonio Quartullic8334842015-11-10 18:50:51 +010037#include <linux/workqueue.h>
Matthias Schifferf02a4782016-07-03 13:31:41 +020038#include <net/genetlink.h>
39#include <net/netlink.h>
40#include <uapi/linux/batman_adv.h>
Linus Luessingd6f94d92016-01-16 16:40:09 +080041
Sven Eckelmanna2d08162016-05-15 11:07:46 +020042#include "bat_algo.h"
Linus Luessingd6f94d92016-01-16 16:40:09 +080043#include "bat_v_elp.h"
Antonio Quartulli0da00352016-01-16 16:40:12 +080044#include "bat_v_ogm.h"
Antonio Quartulli08686942016-07-03 12:46:32 +020045#include "gateway_client.h"
46#include "gateway_common.h"
Antonio Quartullib6cf5d42016-04-14 09:37:05 +080047#include "hard-interface.h"
Antonio Quartulli261e2642016-01-16 16:40:18 +080048#include "hash.h"
Antonio Quartulli50164d82016-07-03 12:46:34 +020049#include "log.h"
Matthias Schifferf02a4782016-07-03 13:31:41 +020050#include "netlink.h"
Antonio Quartulli97869062016-01-16 16:40:17 +080051#include "originator.h"
Linus Luessing162bd642016-01-16 16:40:10 +080052#include "packet.h"
Linus Luessingd6f94d92016-01-16 16:40:09 +080053
Matthias Schifferf02a4782016-07-03 13:31:41 +020054struct sk_buff;
55
Antonio Quartullib6cf5d42016-04-14 09:37:05 +080056static void batadv_v_iface_activate(struct batadv_hard_iface *hard_iface)
57{
Marek Lindnerebe24ce2016-05-07 19:54:17 +080058 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
59 struct batadv_hard_iface *primary_if;
60
61 primary_if = batadv_primary_if_get_selected(bat_priv);
62
63 if (primary_if) {
64 batadv_v_elp_iface_activate(primary_if, hard_iface);
65 batadv_hardif_put(primary_if);
66 }
67
Antonio Quartullib6cf5d42016-04-14 09:37:05 +080068 /* B.A.T.M.A.N. V does not use any queuing mechanism, therefore it can
69 * set the interface as ACTIVE right away, without any risk of race
70 * condition
71 */
72 if (hard_iface->if_status == BATADV_IF_TO_BE_ACTIVATED)
73 hard_iface->if_status = BATADV_IF_ACTIVE;
74}
75
Linus Luessingd6f94d92016-01-16 16:40:09 +080076static int batadv_v_iface_enable(struct batadv_hard_iface *hard_iface)
77{
Antonio Quartulli0da00352016-01-16 16:40:12 +080078 int ret;
79
80 ret = batadv_v_elp_iface_enable(hard_iface);
81 if (ret < 0)
82 return ret;
83
84 ret = batadv_v_ogm_iface_enable(hard_iface);
85 if (ret < 0)
86 batadv_v_elp_iface_disable(hard_iface);
87
88 return ret;
Linus Luessingd6f94d92016-01-16 16:40:09 +080089}
90
91static void batadv_v_iface_disable(struct batadv_hard_iface *hard_iface)
92{
93 batadv_v_elp_iface_disable(hard_iface);
94}
95
Linus Luessingd6f94d92016-01-16 16:40:09 +080096static void batadv_v_primary_iface_set(struct batadv_hard_iface *hard_iface)
97{
98 batadv_v_elp_primary_iface_set(hard_iface);
Antonio Quartulli0da00352016-01-16 16:40:12 +080099 batadv_v_ogm_primary_iface_set(hard_iface);
Linus Luessingd6f94d92016-01-16 16:40:09 +0800100}
101
Antonio Quartulli1653f612016-05-02 01:14:40 +0800102/**
103 * batadv_v_iface_update_mac - react to hard-interface MAC address change
104 * @hard_iface: the modified interface
105 *
106 * If the modified interface is the primary one, update the originator
107 * address in the ELP and OGM messages to reflect the new MAC address.
108 */
109static void batadv_v_iface_update_mac(struct batadv_hard_iface *hard_iface)
110{
111 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
112 struct batadv_hard_iface *primary_if;
113
114 primary_if = batadv_primary_if_get_selected(bat_priv);
115 if (primary_if != hard_iface)
116 goto out;
117
118 batadv_v_primary_iface_set(hard_iface);
119out:
120 if (primary_if)
121 batadv_hardif_put(primary_if);
122}
123
Linus Luessing162bd642016-01-16 16:40:10 +0800124static void
125batadv_v_hardif_neigh_init(struct batadv_hardif_neigh_node *hardif_neigh)
126{
127 ewma_throughput_init(&hardif_neigh->bat_v.throughput);
Antonio Quartullic8334842015-11-10 18:50:51 +0100128 INIT_WORK(&hardif_neigh->bat_v.metric_work,
129 batadv_v_elp_throughput_metric_update);
Linus Luessing162bd642016-01-16 16:40:10 +0800130}
131
Sven Eckelmanndc1cbd12016-07-16 09:31:20 +0200132#ifdef CONFIG_BATMAN_ADV_DEBUGFS
Antonio Quartulli261e2642016-01-16 16:40:18 +0800133/**
134 * batadv_v_orig_print_neigh - print neighbors for the originator table
135 * @orig_node: the orig_node for which the neighbors are printed
136 * @if_outgoing: outgoing interface for these entries
137 * @seq: debugfs table seq_file struct
138 *
139 * Must be called while holding an rcu lock.
140 */
141static void
142batadv_v_orig_print_neigh(struct batadv_orig_node *orig_node,
143 struct batadv_hard_iface *if_outgoing,
144 struct seq_file *seq)
145{
146 struct batadv_neigh_node *neigh_node;
147 struct batadv_neigh_ifinfo *n_ifinfo;
148
149 hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) {
150 n_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing);
151 if (!n_ifinfo)
152 continue;
153
154 seq_printf(seq, " %pM (%9u.%1u)",
155 neigh_node->addr,
156 n_ifinfo->bat_v.throughput / 10,
157 n_ifinfo->bat_v.throughput % 10);
158
159 batadv_neigh_ifinfo_put(n_ifinfo);
160 }
161}
162
163/**
Linus Luessing626d23e2016-01-16 16:40:19 +0800164 * batadv_v_hardif_neigh_print - print a single ELP neighbour node
165 * @seq: neighbour table seq_file struct
166 * @hardif_neigh: hardif neighbour information
167 */
168static void
169batadv_v_hardif_neigh_print(struct seq_file *seq,
170 struct batadv_hardif_neigh_node *hardif_neigh)
171{
172 int last_secs, last_msecs;
173 u32 throughput;
174
175 last_secs = jiffies_to_msecs(jiffies - hardif_neigh->last_seen) / 1000;
176 last_msecs = jiffies_to_msecs(jiffies - hardif_neigh->last_seen) % 1000;
177 throughput = ewma_throughput_read(&hardif_neigh->bat_v.throughput);
178
179 seq_printf(seq, "%pM %4i.%03is (%9u.%1u) [%10s]\n",
180 hardif_neigh->addr, last_secs, last_msecs, throughput / 10,
181 throughput % 10, hardif_neigh->if_incoming->net_dev->name);
182}
183
184/**
185 * batadv_v_neigh_print - print the single hop neighbour list
186 * @bat_priv: the bat priv with all the soft interface information
187 * @seq: neighbour table seq_file struct
188 */
189static void batadv_v_neigh_print(struct batadv_priv *bat_priv,
190 struct seq_file *seq)
191{
192 struct net_device *net_dev = (struct net_device *)seq->private;
193 struct batadv_hardif_neigh_node *hardif_neigh;
194 struct batadv_hard_iface *hard_iface;
195 int batman_count = 0;
196
Antonio Quartulli925a6f32016-03-12 10:30:18 +0100197 seq_puts(seq,
198 " Neighbor last-seen ( throughput) [ IF]\n");
Linus Luessing626d23e2016-01-16 16:40:19 +0800199
200 rcu_read_lock();
201 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
202 if (hard_iface->soft_iface != net_dev)
203 continue;
204
205 hlist_for_each_entry_rcu(hardif_neigh,
206 &hard_iface->neigh_list, list) {
207 batadv_v_hardif_neigh_print(seq, hardif_neigh);
208 batman_count++;
209 }
210 }
211 rcu_read_unlock();
212
213 if (batman_count == 0)
214 seq_puts(seq, "No batman nodes in range ...\n");
215}
Sven Eckelmanndc1cbd12016-07-16 09:31:20 +0200216#endif
Linus Luessing626d23e2016-01-16 16:40:19 +0800217
218/**
Matthias Schifferf02a4782016-07-03 13:31:41 +0200219 * batadv_v_neigh_dump_neigh - Dump a neighbour into a message
220 * @msg: Netlink message to dump into
221 * @portid: Port making netlink request
222 * @seq: Sequence number of netlink message
223 * @hardif_neigh: Neighbour to dump
224 *
225 * Return: Error code, or 0 on success
226 */
227static int
228batadv_v_neigh_dump_neigh(struct sk_buff *msg, u32 portid, u32 seq,
229 struct batadv_hardif_neigh_node *hardif_neigh)
230{
231 void *hdr;
232 unsigned int last_seen_msecs;
233 u32 throughput;
234
235 last_seen_msecs = jiffies_to_msecs(jiffies - hardif_neigh->last_seen);
236 throughput = ewma_throughput_read(&hardif_neigh->bat_v.throughput);
237 throughput = throughput * 100;
238
239 hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, NLM_F_MULTI,
240 BATADV_CMD_GET_NEIGHBORS);
241 if (!hdr)
242 return -ENOBUFS;
243
244 if (nla_put(msg, BATADV_ATTR_NEIGH_ADDRESS, ETH_ALEN,
245 hardif_neigh->addr) ||
246 nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX,
247 hardif_neigh->if_incoming->net_dev->ifindex) ||
248 nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS,
249 last_seen_msecs) ||
250 nla_put_u32(msg, BATADV_ATTR_THROUGHPUT, throughput))
251 goto nla_put_failure;
252
253 genlmsg_end(msg, hdr);
254 return 0;
255
256 nla_put_failure:
257 genlmsg_cancel(msg, hdr);
258 return -EMSGSIZE;
259}
260
261/**
262 * batadv_v_neigh_dump_hardif - Dump the neighbours of a hard interface into
263 * a message
264 * @msg: Netlink message to dump into
265 * @portid: Port making netlink request
266 * @seq: Sequence number of netlink message
267 * @bat_priv: The bat priv with all the soft interface information
268 * @hard_iface: The hard interface to be dumped
269 * @idx_s: Entries to be skipped
270 *
271 * This function assumes the caller holds rcu_read_lock().
272 *
273 * Return: Error code, or 0 on success
274 */
275static int
276batadv_v_neigh_dump_hardif(struct sk_buff *msg, u32 portid, u32 seq,
277 struct batadv_priv *bat_priv,
278 struct batadv_hard_iface *hard_iface,
279 int *idx_s)
280{
281 struct batadv_hardif_neigh_node *hardif_neigh;
282 int idx = 0;
283
284 hlist_for_each_entry_rcu(hardif_neigh,
285 &hard_iface->neigh_list, list) {
286 if (idx++ < *idx_s)
287 continue;
288
289 if (batadv_v_neigh_dump_neigh(msg, portid, seq, hardif_neigh)) {
290 *idx_s = idx - 1;
291 return -EMSGSIZE;
292 }
293 }
294
295 *idx_s = 0;
296 return 0;
297}
298
299/**
300 * batadv_v_neigh_dump - Dump the neighbours of a hard interface into a
301 * message
302 * @msg: Netlink message to dump into
303 * @cb: Control block containing additional options
304 * @bat_priv: The bat priv with all the soft interface information
305 * @single_hardif: Limit dumping to this hard interface
306 */
307static void
308batadv_v_neigh_dump(struct sk_buff *msg, struct netlink_callback *cb,
309 struct batadv_priv *bat_priv,
310 struct batadv_hard_iface *single_hardif)
311{
312 struct batadv_hard_iface *hard_iface;
313 int i_hardif = 0;
314 int i_hardif_s = cb->args[0];
315 int idx = cb->args[1];
316 int portid = NETLINK_CB(cb->skb).portid;
317
318 rcu_read_lock();
319 if (single_hardif) {
320 if (i_hardif_s == 0) {
321 if (batadv_v_neigh_dump_hardif(msg, portid,
322 cb->nlh->nlmsg_seq,
323 bat_priv, single_hardif,
324 &idx) == 0)
325 i_hardif++;
326 }
327 } else {
328 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
329 if (hard_iface->soft_iface != bat_priv->soft_iface)
330 continue;
331
332 if (i_hardif++ < i_hardif_s)
333 continue;
334
335 if (batadv_v_neigh_dump_hardif(msg, portid,
336 cb->nlh->nlmsg_seq,
337 bat_priv, hard_iface,
338 &idx)) {
339 i_hardif--;
340 break;
341 }
342 }
343 }
344 rcu_read_unlock();
345
346 cb->args[0] = i_hardif;
347 cb->args[1] = idx;
348}
349
Sven Eckelmanndc1cbd12016-07-16 09:31:20 +0200350#ifdef CONFIG_BATMAN_ADV_DEBUGFS
Matthias Schifferf02a4782016-07-03 13:31:41 +0200351/**
Antonio Quartulli261e2642016-01-16 16:40:18 +0800352 * batadv_v_orig_print - print the originator table
353 * @bat_priv: the bat priv with all the soft interface information
354 * @seq: debugfs table seq_file struct
355 * @if_outgoing: the outgoing interface for which this should be printed
356 */
357static void batadv_v_orig_print(struct batadv_priv *bat_priv,
358 struct seq_file *seq,
359 struct batadv_hard_iface *if_outgoing)
360{
361 struct batadv_neigh_node *neigh_node;
362 struct batadv_hashtable *hash = bat_priv->orig_hash;
363 int last_seen_msecs, last_seen_secs;
364 struct batadv_orig_node *orig_node;
365 struct batadv_neigh_ifinfo *n_ifinfo;
366 unsigned long last_seen_jiffies;
367 struct hlist_head *head;
368 int batman_count = 0;
369 u32 i;
370
Antonio Quartulli925a6f32016-03-12 10:30:18 +0100371 seq_puts(seq,
372 " Originator last-seen ( throughput) Nexthop [outgoingIF]: Potential nexthops ...\n");
Antonio Quartulli261e2642016-01-16 16:40:18 +0800373
374 for (i = 0; i < hash->size; i++) {
375 head = &hash->table[i];
376
377 rcu_read_lock();
378 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
379 neigh_node = batadv_orig_router_get(orig_node,
380 if_outgoing);
381 if (!neigh_node)
382 continue;
383
384 n_ifinfo = batadv_neigh_ifinfo_get(neigh_node,
385 if_outgoing);
386 if (!n_ifinfo)
387 goto next;
388
389 last_seen_jiffies = jiffies - orig_node->last_seen;
390 last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
391 last_seen_secs = last_seen_msecs / 1000;
392 last_seen_msecs = last_seen_msecs % 1000;
393
394 seq_printf(seq, "%pM %4i.%03is (%9u.%1u) %pM [%10s]:",
395 orig_node->orig, last_seen_secs,
396 last_seen_msecs,
397 n_ifinfo->bat_v.throughput / 10,
398 n_ifinfo->bat_v.throughput % 10,
399 neigh_node->addr,
400 neigh_node->if_incoming->net_dev->name);
401
402 batadv_v_orig_print_neigh(orig_node, if_outgoing, seq);
403 seq_puts(seq, "\n");
404 batman_count++;
405
406next:
407 batadv_neigh_node_put(neigh_node);
408 if (n_ifinfo)
409 batadv_neigh_ifinfo_put(n_ifinfo);
410 }
411 rcu_read_unlock();
412 }
413
414 if (batman_count == 0)
415 seq_puts(seq, "No batman nodes in range ...\n");
416}
Sven Eckelmanndc1cbd12016-07-16 09:31:20 +0200417#endif
Antonio Quartulli261e2642016-01-16 16:40:18 +0800418
Matthias Schifferf02a4782016-07-03 13:31:41 +0200419/**
420 * batadv_v_orig_dump_subentry - Dump an originator subentry into a
421 * message
422 * @msg: Netlink message to dump into
423 * @portid: Port making netlink request
424 * @seq: Sequence number of netlink message
425 * @bat_priv: The bat priv with all the soft interface information
426 * @if_outgoing: Limit dump to entries with this outgoing interface
427 * @orig_node: Originator to dump
428 * @neigh_node: Single hops neighbour
429 * @best: Is the best originator
430 *
431 * Return: Error code, or 0 on success
432 */
433static int
434batadv_v_orig_dump_subentry(struct sk_buff *msg, u32 portid, u32 seq,
435 struct batadv_priv *bat_priv,
436 struct batadv_hard_iface *if_outgoing,
437 struct batadv_orig_node *orig_node,
438 struct batadv_neigh_node *neigh_node,
439 bool best)
440{
441 struct batadv_neigh_ifinfo *n_ifinfo;
442 unsigned int last_seen_msecs;
443 u32 throughput;
444 void *hdr;
445
446 n_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing);
447 if (!n_ifinfo)
448 return 0;
449
450 throughput = n_ifinfo->bat_v.throughput * 100;
451
452 batadv_neigh_ifinfo_put(n_ifinfo);
453
454 last_seen_msecs = jiffies_to_msecs(jiffies - orig_node->last_seen);
455
456 if (if_outgoing != BATADV_IF_DEFAULT &&
457 if_outgoing != neigh_node->if_incoming)
458 return 0;
459
460 hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, NLM_F_MULTI,
461 BATADV_CMD_GET_ORIGINATORS);
462 if (!hdr)
463 return -ENOBUFS;
464
465 if (nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN, orig_node->orig) ||
466 nla_put(msg, BATADV_ATTR_NEIGH_ADDRESS, ETH_ALEN,
467 neigh_node->addr) ||
468 nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX,
469 neigh_node->if_incoming->net_dev->ifindex) ||
470 nla_put_u32(msg, BATADV_ATTR_THROUGHPUT, throughput) ||
471 nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS,
472 last_seen_msecs))
473 goto nla_put_failure;
474
475 if (best && nla_put_flag(msg, BATADV_ATTR_FLAG_BEST))
476 goto nla_put_failure;
477
478 genlmsg_end(msg, hdr);
479 return 0;
480
481 nla_put_failure:
482 genlmsg_cancel(msg, hdr);
483 return -EMSGSIZE;
484}
485
486/**
487 * batadv_v_orig_dump_entry - Dump an originator entry into a message
488 * @msg: Netlink message to dump into
489 * @portid: Port making netlink request
490 * @seq: Sequence number of netlink message
491 * @bat_priv: The bat priv with all the soft interface information
492 * @if_outgoing: Limit dump to entries with this outgoing interface
493 * @orig_node: Originator to dump
494 * @sub_s: Number of sub entries to skip
495 *
496 * This function assumes the caller holds rcu_read_lock().
497 *
498 * Return: Error code, or 0 on success
499 */
500static int
501batadv_v_orig_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
502 struct batadv_priv *bat_priv,
503 struct batadv_hard_iface *if_outgoing,
504 struct batadv_orig_node *orig_node, int *sub_s)
505{
506 struct batadv_neigh_node *neigh_node_best;
507 struct batadv_neigh_node *neigh_node;
508 int sub = 0;
509 bool best;
510
511 neigh_node_best = batadv_orig_router_get(orig_node, if_outgoing);
512 if (!neigh_node_best)
513 goto out;
514
515 hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) {
516 if (sub++ < *sub_s)
517 continue;
518
519 best = (neigh_node == neigh_node_best);
520
521 if (batadv_v_orig_dump_subentry(msg, portid, seq, bat_priv,
522 if_outgoing, orig_node,
523 neigh_node, best)) {
524 batadv_neigh_node_put(neigh_node_best);
525
526 *sub_s = sub - 1;
527 return -EMSGSIZE;
528 }
529 }
530
531 out:
532 if (neigh_node_best)
533 batadv_neigh_node_put(neigh_node_best);
534
535 *sub_s = 0;
536 return 0;
537}
538
539/**
540 * batadv_v_orig_dump_bucket - Dump an originator bucket into a
541 * message
542 * @msg: Netlink message to dump into
543 * @portid: Port making netlink request
544 * @seq: Sequence number of netlink message
545 * @bat_priv: The bat priv with all the soft interface information
546 * @if_outgoing: Limit dump to entries with this outgoing interface
547 * @head: Bucket to be dumped
548 * @idx_s: Number of entries to be skipped
549 * @sub: Number of sub entries to be skipped
550 *
551 * Return: Error code, or 0 on success
552 */
553static int
554batadv_v_orig_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq,
555 struct batadv_priv *bat_priv,
556 struct batadv_hard_iface *if_outgoing,
557 struct hlist_head *head, int *idx_s, int *sub)
558{
559 struct batadv_orig_node *orig_node;
560 int idx = 0;
561
562 rcu_read_lock();
563 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
564 if (idx++ < *idx_s)
565 continue;
566
567 if (batadv_v_orig_dump_entry(msg, portid, seq, bat_priv,
568 if_outgoing, orig_node, sub)) {
569 rcu_read_unlock();
570 *idx_s = idx - 1;
571 return -EMSGSIZE;
572 }
573 }
574 rcu_read_unlock();
575
576 *idx_s = 0;
577 *sub = 0;
578 return 0;
579}
580
581/**
582 * batadv_v_orig_dump - Dump the originators into a message
583 * @msg: Netlink message to dump into
584 * @cb: Control block containing additional options
585 * @bat_priv: The bat priv with all the soft interface information
586 * @if_outgoing: Limit dump to entries with this outgoing interface
587 */
588static void
589batadv_v_orig_dump(struct sk_buff *msg, struct netlink_callback *cb,
590 struct batadv_priv *bat_priv,
591 struct batadv_hard_iface *if_outgoing)
592{
593 struct batadv_hashtable *hash = bat_priv->orig_hash;
594 struct hlist_head *head;
595 int bucket = cb->args[0];
596 int idx = cb->args[1];
597 int sub = cb->args[2];
598 int portid = NETLINK_CB(cb->skb).portid;
599
600 while (bucket < hash->size) {
601 head = &hash->table[bucket];
602
603 if (batadv_v_orig_dump_bucket(msg, portid,
604 cb->nlh->nlmsg_seq,
605 bat_priv, if_outgoing, head, &idx,
606 &sub))
607 break;
608
609 bucket++;
610 }
611
612 cb->args[0] = bucket;
613 cb->args[1] = idx;
614 cb->args[2] = sub;
615}
616
Antonio Quartulli97869062016-01-16 16:40:17 +0800617static int batadv_v_neigh_cmp(struct batadv_neigh_node *neigh1,
618 struct batadv_hard_iface *if_outgoing1,
619 struct batadv_neigh_node *neigh2,
620 struct batadv_hard_iface *if_outgoing2)
621{
622 struct batadv_neigh_ifinfo *ifinfo1, *ifinfo2;
Sven Eckelmann71f9d272016-05-06 11:43:39 +0200623 int ret = 0;
Antonio Quartulli97869062016-01-16 16:40:17 +0800624
625 ifinfo1 = batadv_neigh_ifinfo_get(neigh1, if_outgoing1);
Sven Eckelmann71f9d272016-05-06 11:43:39 +0200626 if (WARN_ON(!ifinfo1))
627 goto err_ifinfo1;
628
Antonio Quartulli97869062016-01-16 16:40:17 +0800629 ifinfo2 = batadv_neigh_ifinfo_get(neigh2, if_outgoing2);
Sven Eckelmann71f9d272016-05-06 11:43:39 +0200630 if (WARN_ON(!ifinfo2))
631 goto err_ifinfo2;
Antonio Quartulli97869062016-01-16 16:40:17 +0800632
Sven Eckelmann71f9d272016-05-06 11:43:39 +0200633 ret = ifinfo1->bat_v.throughput - ifinfo2->bat_v.throughput;
Antonio Quartulli97869062016-01-16 16:40:17 +0800634
Sven Eckelmann71f9d272016-05-06 11:43:39 +0200635 batadv_neigh_ifinfo_put(ifinfo2);
636err_ifinfo2:
637 batadv_neigh_ifinfo_put(ifinfo1);
638err_ifinfo1:
639 return ret;
Antonio Quartulli97869062016-01-16 16:40:17 +0800640}
641
642static bool batadv_v_neigh_is_sob(struct batadv_neigh_node *neigh1,
643 struct batadv_hard_iface *if_outgoing1,
644 struct batadv_neigh_node *neigh2,
645 struct batadv_hard_iface *if_outgoing2)
646{
647 struct batadv_neigh_ifinfo *ifinfo1, *ifinfo2;
648 u32 threshold;
Sven Eckelmann71f9d272016-05-06 11:43:39 +0200649 bool ret = false;
Antonio Quartulli97869062016-01-16 16:40:17 +0800650
651 ifinfo1 = batadv_neigh_ifinfo_get(neigh1, if_outgoing1);
Sven Eckelmann71f9d272016-05-06 11:43:39 +0200652 if (WARN_ON(!ifinfo1))
653 goto err_ifinfo1;
Antonio Quartulli97869062016-01-16 16:40:17 +0800654
Sven Eckelmann71f9d272016-05-06 11:43:39 +0200655 ifinfo2 = batadv_neigh_ifinfo_get(neigh2, if_outgoing2);
656 if (WARN_ON(!ifinfo2))
657 goto err_ifinfo2;
Sven Eckelmanna45e9322016-05-06 11:43:38 +0200658
Antonio Quartulli97869062016-01-16 16:40:17 +0800659 threshold = ifinfo1->bat_v.throughput / 4;
660 threshold = ifinfo1->bat_v.throughput - threshold;
661
Sven Eckelmann71f9d272016-05-06 11:43:39 +0200662 ret = ifinfo2->bat_v.throughput > threshold;
663
664 batadv_neigh_ifinfo_put(ifinfo2);
665err_ifinfo2:
666 batadv_neigh_ifinfo_put(ifinfo1);
667err_ifinfo1:
668 return ret;
Antonio Quartulli97869062016-01-16 16:40:17 +0800669}
670
Antonio Quartulli08686942016-07-03 12:46:32 +0200671static ssize_t batadv_v_store_sel_class(struct batadv_priv *bat_priv,
672 char *buff, size_t count)
673{
674 u32 old_class, class;
675
676 if (!batadv_parse_throughput(bat_priv->soft_iface, buff,
677 "B.A.T.M.A.N. V GW selection class",
678 &class))
679 return -EINVAL;
680
681 old_class = atomic_read(&bat_priv->gw.sel_class);
682 atomic_set(&bat_priv->gw.sel_class, class);
683
684 if (old_class != class)
685 batadv_gw_reselect(bat_priv);
686
687 return count;
688}
689
690static ssize_t batadv_v_show_sel_class(struct batadv_priv *bat_priv, char *buff)
691{
692 u32 class = atomic_read(&bat_priv->gw.sel_class);
693
694 return sprintf(buff, "%u.%u MBit\n", class / 10, class % 10);
695}
696
Antonio Quartulli50164d82016-07-03 12:46:34 +0200697/**
698 * batadv_v_gw_throughput_get - retrieve the GW-bandwidth for a given GW
699 * @gw_node: the GW to retrieve the metric for
700 * @bw: the pointer where the metric will be stored. The metric is computed as
701 * the minimum between the GW advertised throughput and the path throughput to
702 * it in the mesh
703 *
704 * Return: 0 on success, -1 on failure
705 */
706static int batadv_v_gw_throughput_get(struct batadv_gw_node *gw_node, u32 *bw)
707{
708 struct batadv_neigh_ifinfo *router_ifinfo = NULL;
709 struct batadv_orig_node *orig_node;
710 struct batadv_neigh_node *router;
711 int ret = -1;
712
713 orig_node = gw_node->orig_node;
714 router = batadv_orig_router_get(orig_node, BATADV_IF_DEFAULT);
715 if (!router)
716 goto out;
717
718 router_ifinfo = batadv_neigh_ifinfo_get(router, BATADV_IF_DEFAULT);
719 if (!router_ifinfo)
720 goto out;
721
722 /* the GW metric is computed as the minimum between the path throughput
723 * to reach the GW itself and the advertised bandwidth.
724 * This gives us an approximation of the effective throughput that the
725 * client can expect via this particular GW node
726 */
727 *bw = router_ifinfo->bat_v.throughput;
728 *bw = min_t(u32, *bw, gw_node->bandwidth_down);
729
730 ret = 0;
731out:
732 if (router)
733 batadv_neigh_node_put(router);
734 if (router_ifinfo)
735 batadv_neigh_ifinfo_put(router_ifinfo);
736
737 return ret;
738}
739
740/**
741 * batadv_v_gw_get_best_gw_node - retrieve the best GW node
742 * @bat_priv: the bat priv with all the soft interface information
743 *
744 * Return: the GW node having the best GW-metric, NULL if no GW is known
745 */
746static struct batadv_gw_node *
747batadv_v_gw_get_best_gw_node(struct batadv_priv *bat_priv)
748{
749 struct batadv_gw_node *gw_node, *curr_gw = NULL;
750 u32 max_bw = 0, bw;
751
752 rcu_read_lock();
753 hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.list, list) {
754 if (!kref_get_unless_zero(&gw_node->refcount))
755 continue;
756
757 if (batadv_v_gw_throughput_get(gw_node, &bw) < 0)
758 goto next;
759
760 if (curr_gw && (bw <= max_bw))
761 goto next;
762
763 if (curr_gw)
764 batadv_gw_node_put(curr_gw);
765
766 curr_gw = gw_node;
767 kref_get(&curr_gw->refcount);
768 max_bw = bw;
769
770next:
771 batadv_gw_node_put(gw_node);
772 }
773 rcu_read_unlock();
774
775 return curr_gw;
776}
777
778/**
779 * batadv_v_gw_is_eligible - check if a originator would be selected as GW
780 * @bat_priv: the bat priv with all the soft interface information
781 * @curr_gw_orig: originator representing the currently selected GW
782 * @orig_node: the originator representing the new candidate
783 *
784 * Return: true if orig_node can be selected as current GW, false otherwise
785 */
786static bool batadv_v_gw_is_eligible(struct batadv_priv *bat_priv,
787 struct batadv_orig_node *curr_gw_orig,
788 struct batadv_orig_node *orig_node)
789{
790 struct batadv_gw_node *curr_gw = NULL, *orig_gw = NULL;
791 u32 gw_throughput, orig_throughput, threshold;
792 bool ret = false;
793
794 threshold = atomic_read(&bat_priv->gw.sel_class);
795
796 curr_gw = batadv_gw_node_get(bat_priv, curr_gw_orig);
797 if (!curr_gw) {
798 ret = true;
799 goto out;
800 }
801
802 if (batadv_v_gw_throughput_get(curr_gw, &gw_throughput) < 0) {
803 ret = true;
804 goto out;
805 }
806
807 orig_gw = batadv_gw_node_get(bat_priv, orig_node);
808 if (!orig_node)
809 goto out;
810
811 if (batadv_v_gw_throughput_get(orig_gw, &orig_throughput) < 0)
812 goto out;
813
814 if (orig_throughput < gw_throughput)
815 goto out;
816
817 if ((orig_throughput - gw_throughput) < threshold)
818 goto out;
819
820 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
821 "Restarting gateway selection: better gateway found (throughput curr: %u, throughput new: %u)\n",
822 gw_throughput, orig_throughput);
823
824 ret = true;
825out:
826 if (curr_gw)
827 batadv_gw_node_put(curr_gw);
828 if (orig_gw)
829 batadv_gw_node_put(orig_gw);
830
831 return ret;
832}
833
Sven Eckelmanndc1cbd12016-07-16 09:31:20 +0200834#ifdef CONFIG_BATMAN_ADV_DEBUGFS
Antonio Quartulli50164d82016-07-03 12:46:34 +0200835/* fails if orig_node has no router */
836static int batadv_v_gw_write_buffer_text(struct batadv_priv *bat_priv,
837 struct seq_file *seq,
838 const struct batadv_gw_node *gw_node)
839{
840 struct batadv_gw_node *curr_gw;
841 struct batadv_neigh_node *router;
842 struct batadv_neigh_ifinfo *router_ifinfo = NULL;
843 int ret = -1;
844
845 router = batadv_orig_router_get(gw_node->orig_node, BATADV_IF_DEFAULT);
846 if (!router)
847 goto out;
848
849 router_ifinfo = batadv_neigh_ifinfo_get(router, BATADV_IF_DEFAULT);
850 if (!router_ifinfo)
851 goto out;
852
853 curr_gw = batadv_gw_get_selected_gw_node(bat_priv);
854
855 seq_printf(seq, "%s %pM (%9u.%1u) %pM [%10s]: %u.%u/%u.%u MBit\n",
856 (curr_gw == gw_node ? "=>" : " "),
857 gw_node->orig_node->orig,
858 router_ifinfo->bat_v.throughput / 10,
859 router_ifinfo->bat_v.throughput % 10, router->addr,
860 router->if_incoming->net_dev->name,
861 gw_node->bandwidth_down / 10,
862 gw_node->bandwidth_down % 10,
863 gw_node->bandwidth_up / 10,
864 gw_node->bandwidth_up % 10);
865 ret = seq_has_overflowed(seq) ? -1 : 0;
866
867 if (curr_gw)
868 batadv_gw_node_put(curr_gw);
869out:
870 if (router_ifinfo)
871 batadv_neigh_ifinfo_put(router_ifinfo);
872 if (router)
873 batadv_neigh_node_put(router);
874 return ret;
875}
876
877/**
878 * batadv_v_gw_print - print the gateway list
879 * @bat_priv: the bat priv with all the soft interface information
880 * @seq: gateway table seq_file struct
881 */
882static void batadv_v_gw_print(struct batadv_priv *bat_priv,
883 struct seq_file *seq)
884{
885 struct batadv_gw_node *gw_node;
886 int gw_count = 0;
887
888 seq_puts(seq,
889 " Gateway ( throughput) Nexthop [outgoingIF]: advertised uplink bandwidth\n");
890
891 rcu_read_lock();
892 hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.list, list) {
893 /* fails if orig_node has no router */
894 if (batadv_v_gw_write_buffer_text(bat_priv, seq, gw_node) < 0)
895 continue;
896
897 gw_count++;
898 }
899 rcu_read_unlock();
900
901 if (gw_count == 0)
902 seq_puts(seq, "No gateways in range ...\n");
903}
Sven Eckelmanndc1cbd12016-07-16 09:31:20 +0200904#endif
Antonio Quartulli50164d82016-07-03 12:46:34 +0200905
Sven Eckelmannb71bb6f2016-07-03 13:31:44 +0200906/**
907 * batadv_v_gw_dump_entry - Dump a gateway into a message
908 * @msg: Netlink message to dump into
909 * @portid: Port making netlink request
910 * @seq: Sequence number of netlink message
911 * @bat_priv: The bat priv with all the soft interface information
912 * @gw_node: Gateway to be dumped
913 *
914 * Return: Error code, or 0 on success
915 */
916static int batadv_v_gw_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
917 struct batadv_priv *bat_priv,
918 struct batadv_gw_node *gw_node)
919{
920 struct batadv_neigh_ifinfo *router_ifinfo = NULL;
921 struct batadv_neigh_node *router;
922 struct batadv_gw_node *curr_gw;
923 int ret = -EINVAL;
924 void *hdr;
925
926 router = batadv_orig_router_get(gw_node->orig_node, BATADV_IF_DEFAULT);
927 if (!router)
928 goto out;
929
930 router_ifinfo = batadv_neigh_ifinfo_get(router, BATADV_IF_DEFAULT);
931 if (!router_ifinfo)
932 goto out;
933
934 curr_gw = batadv_gw_get_selected_gw_node(bat_priv);
935
936 hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
937 NLM_F_MULTI, BATADV_CMD_GET_GATEWAYS);
938 if (!hdr) {
939 ret = -ENOBUFS;
940 goto out;
941 }
942
943 ret = -EMSGSIZE;
944
945 if (curr_gw == gw_node) {
946 if (nla_put_flag(msg, BATADV_ATTR_FLAG_BEST)) {
947 genlmsg_cancel(msg, hdr);
948 goto out;
949 }
950 }
951
952 if (nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN,
953 gw_node->orig_node->orig)) {
954 genlmsg_cancel(msg, hdr);
955 goto out;
956 }
957
958 if (nla_put_u32(msg, BATADV_ATTR_THROUGHPUT,
959 router_ifinfo->bat_v.throughput)) {
960 genlmsg_cancel(msg, hdr);
961 goto out;
962 }
963
964 if (nla_put(msg, BATADV_ATTR_ROUTER, ETH_ALEN, router->addr)) {
965 genlmsg_cancel(msg, hdr);
966 goto out;
967 }
968
969 if (nla_put_string(msg, BATADV_ATTR_HARD_IFNAME,
970 router->if_incoming->net_dev->name)) {
971 genlmsg_cancel(msg, hdr);
972 goto out;
973 }
974
975 if (nla_put_u32(msg, BATADV_ATTR_BANDWIDTH_DOWN,
976 gw_node->bandwidth_down)) {
977 genlmsg_cancel(msg, hdr);
978 goto out;
979 }
980
981 if (nla_put_u32(msg, BATADV_ATTR_BANDWIDTH_UP, gw_node->bandwidth_up)) {
982 genlmsg_cancel(msg, hdr);
983 goto out;
984 }
985
986 genlmsg_end(msg, hdr);
987 ret = 0;
988
989out:
990 if (router_ifinfo)
991 batadv_neigh_ifinfo_put(router_ifinfo);
992 if (router)
993 batadv_neigh_node_put(router);
994 return ret;
995}
996
997/**
998 * batadv_v_gw_dump - Dump gateways into a message
999 * @msg: Netlink message to dump into
1000 * @cb: Control block containing additional options
1001 * @bat_priv: The bat priv with all the soft interface information
1002 */
1003static void batadv_v_gw_dump(struct sk_buff *msg, struct netlink_callback *cb,
1004 struct batadv_priv *bat_priv)
1005{
1006 int portid = NETLINK_CB(cb->skb).portid;
1007 struct batadv_gw_node *gw_node;
1008 int idx_skip = cb->args[0];
1009 int idx = 0;
1010
1011 rcu_read_lock();
1012 hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.list, list) {
1013 if (idx++ < idx_skip)
1014 continue;
1015
1016 if (batadv_v_gw_dump_entry(msg, portid, cb->nlh->nlmsg_seq,
1017 bat_priv, gw_node)) {
1018 idx_skip = idx - 1;
1019 goto unlock;
1020 }
1021 }
1022
1023 idx_skip = idx;
1024unlock:
1025 rcu_read_unlock();
1026
1027 cb->args[0] = idx_skip;
1028}
1029
Linus Luessingd6f94d92016-01-16 16:40:09 +08001030static struct batadv_algo_ops batadv_batman_v __read_mostly = {
1031 .name = "BATMAN_V",
Antonio Quartulli29824a52016-05-25 23:27:31 +08001032 .iface = {
1033 .activate = batadv_v_iface_activate,
1034 .enable = batadv_v_iface_enable,
1035 .disable = batadv_v_iface_disable,
1036 .update_mac = batadv_v_iface_update_mac,
1037 .primary_set = batadv_v_primary_iface_set,
1038 },
1039 .neigh = {
1040 .hardif_init = batadv_v_hardif_neigh_init,
1041 .cmp = batadv_v_neigh_cmp,
1042 .is_similar_or_better = batadv_v_neigh_is_sob,
Sven Eckelmanndc1cbd12016-07-16 09:31:20 +02001043#ifdef CONFIG_BATMAN_ADV_DEBUGFS
Antonio Quartulli29824a52016-05-25 23:27:31 +08001044 .print = batadv_v_neigh_print,
Sven Eckelmanndc1cbd12016-07-16 09:31:20 +02001045#endif
Matthias Schifferf02a4782016-07-03 13:31:41 +02001046 .dump = batadv_v_neigh_dump,
Antonio Quartulli29824a52016-05-25 23:27:31 +08001047 },
1048 .orig = {
Sven Eckelmanndc1cbd12016-07-16 09:31:20 +02001049#ifdef CONFIG_BATMAN_ADV_DEBUGFS
Antonio Quartulli29824a52016-05-25 23:27:31 +08001050 .print = batadv_v_orig_print,
Sven Eckelmanndc1cbd12016-07-16 09:31:20 +02001051#endif
Matthias Schifferf02a4782016-07-03 13:31:41 +02001052 .dump = batadv_v_orig_dump,
Antonio Quartulli29824a52016-05-25 23:27:31 +08001053 },
Antonio Quartulli08686942016-07-03 12:46:32 +02001054 .gw = {
1055 .store_sel_class = batadv_v_store_sel_class,
1056 .show_sel_class = batadv_v_show_sel_class,
Antonio Quartulli50164d82016-07-03 12:46:34 +02001057 .get_best_gw_node = batadv_v_gw_get_best_gw_node,
1058 .is_eligible = batadv_v_gw_is_eligible,
Sven Eckelmanndc1cbd12016-07-16 09:31:20 +02001059#ifdef CONFIG_BATMAN_ADV_DEBUGFS
Antonio Quartulli50164d82016-07-03 12:46:34 +02001060 .print = batadv_v_gw_print,
Sven Eckelmanndc1cbd12016-07-16 09:31:20 +02001061#endif
Sven Eckelmannb71bb6f2016-07-03 13:31:44 +02001062 .dump = batadv_v_gw_dump,
Antonio Quartulli08686942016-07-03 12:46:32 +02001063 },
Linus Luessingd6f94d92016-01-16 16:40:09 +08001064};
1065
1066/**
Marek Lindner7db682d2016-05-10 22:31:59 +08001067 * batadv_v_hardif_init - initialize the algorithm specific fields in the
1068 * hard-interface object
1069 * @hard_iface: the hard-interface to initialize
1070 */
1071void batadv_v_hardif_init(struct batadv_hard_iface *hard_iface)
1072{
1073 /* enable link throughput auto-detection by setting the throughput
1074 * override to zero
1075 */
1076 atomic_set(&hard_iface->bat_v.throughput_override, 0);
1077 atomic_set(&hard_iface->bat_v.elp_interval, 500);
1078}
1079
1080/**
Antonio Quartulli0da00352016-01-16 16:40:12 +08001081 * batadv_v_mesh_init - initialize the B.A.T.M.A.N. V private resources for a
1082 * mesh
1083 * @bat_priv: the object representing the mesh interface to initialise
1084 *
1085 * Return: 0 on success or a negative error code otherwise
1086 */
1087int batadv_v_mesh_init(struct batadv_priv *bat_priv)
1088{
Antonio Quartulli50164d82016-07-03 12:46:34 +02001089 int ret = 0;
1090
1091 ret = batadv_v_ogm_init(bat_priv);
1092 if (ret < 0)
1093 return ret;
1094
1095 /* set default throughput difference threshold to 5Mbps */
1096 atomic_set(&bat_priv->gw.sel_class, 50);
1097
1098 return 0;
Antonio Quartulli0da00352016-01-16 16:40:12 +08001099}
1100
1101/**
1102 * batadv_v_mesh_free - free the B.A.T.M.A.N. V private resources for a mesh
1103 * @bat_priv: the object representing the mesh interface to free
1104 */
1105void batadv_v_mesh_free(struct batadv_priv *bat_priv)
1106{
1107 batadv_v_ogm_free(bat_priv);
1108}
1109
1110/**
Linus Luessingd6f94d92016-01-16 16:40:09 +08001111 * batadv_v_init - B.A.T.M.A.N. V initialization function
1112 *
1113 * Description: Takes care of initializing all the subcomponents.
1114 * It is invoked upon module load only.
1115 *
1116 * Return: 0 on success or a negative error code otherwise
1117 */
1118int __init batadv_v_init(void)
1119{
Linus Luessing162bd642016-01-16 16:40:10 +08001120 int ret;
1121
1122 /* B.A.T.M.A.N. V echo location protocol packet */
1123 ret = batadv_recv_handler_register(BATADV_ELP,
1124 batadv_v_elp_packet_recv);
1125 if (ret < 0)
1126 return ret;
1127
Antonio Quartulli0da00352016-01-16 16:40:12 +08001128 ret = batadv_recv_handler_register(BATADV_OGM2,
1129 batadv_v_ogm_packet_recv);
Linus Luessing162bd642016-01-16 16:40:10 +08001130 if (ret < 0)
Antonio Quartulli0da00352016-01-16 16:40:12 +08001131 goto elp_unregister;
1132
1133 ret = batadv_algo_register(&batadv_batman_v);
1134 if (ret < 0)
1135 goto ogm_unregister;
1136
1137 return ret;
1138
1139ogm_unregister:
1140 batadv_recv_handler_unregister(BATADV_OGM2);
1141
1142elp_unregister:
1143 batadv_recv_handler_unregister(BATADV_ELP);
Linus Luessing162bd642016-01-16 16:40:10 +08001144
1145 return ret;
Linus Luessingd6f94d92016-01-16 16:40:09 +08001146}