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Linux/net/batman-adv/bat_v_elp.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /* Copyright (C) 2011-2019  B.A.T.M.A.N. contributors:
  3  *
  4  * Linus L├╝ssing, Marek Lindner
  5  *
  6  * This program is free software; you can redistribute it and/or
  7  * modify it under the terms of version 2 of the GNU General Public
  8  * License as published by the Free Software Foundation.
  9  *
 10  * This program is distributed in the hope that it will be useful, but
 11  * WITHOUT ANY WARRANTY; without even the implied warranty of
 12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 13  * General Public License for more details.
 14  *
 15  * You should have received a copy of the GNU General Public License
 16  * along with this program; if not, see <http://www.gnu.org/licenses/>.
 17  */
 18 
 19 #include "bat_v_elp.h"
 20 #include "main.h"
 21 
 22 #include <linux/atomic.h>
 23 #include <linux/bitops.h>
 24 #include <linux/byteorder/generic.h>
 25 #include <linux/errno.h>
 26 #include <linux/etherdevice.h>
 27 #include <linux/ethtool.h>
 28 #include <linux/gfp.h>
 29 #include <linux/if_ether.h>
 30 #include <linux/jiffies.h>
 31 #include <linux/kernel.h>
 32 #include <linux/kref.h>
 33 #include <linux/netdevice.h>
 34 #include <linux/nl80211.h>
 35 #include <linux/random.h>
 36 #include <linux/rculist.h>
 37 #include <linux/rcupdate.h>
 38 #include <linux/rtnetlink.h>
 39 #include <linux/skbuff.h>
 40 #include <linux/stddef.h>
 41 #include <linux/string.h>
 42 #include <linux/types.h>
 43 #include <linux/workqueue.h>
 44 #include <net/cfg80211.h>
 45 #include <uapi/linux/batadv_packet.h>
 46 
 47 #include "bat_algo.h"
 48 #include "bat_v_ogm.h"
 49 #include "hard-interface.h"
 50 #include "log.h"
 51 #include "originator.h"
 52 #include "routing.h"
 53 #include "send.h"
 54 
 55 /**
 56  * batadv_v_elp_start_timer() - restart timer for ELP periodic work
 57  * @hard_iface: the interface for which the timer has to be reset
 58  */
 59 static void batadv_v_elp_start_timer(struct batadv_hard_iface *hard_iface)
 60 {
 61         unsigned int msecs;
 62 
 63         msecs = atomic_read(&hard_iface->bat_v.elp_interval) - BATADV_JITTER;
 64         msecs += prandom_u32() % (2 * BATADV_JITTER);
 65 
 66         queue_delayed_work(batadv_event_workqueue, &hard_iface->bat_v.elp_wq,
 67                            msecs_to_jiffies(msecs));
 68 }
 69 
 70 /**
 71  * batadv_v_elp_get_throughput() - get the throughput towards a neighbour
 72  * @neigh: the neighbour for which the throughput has to be obtained
 73  *
 74  * Return: The throughput towards the given neighbour in multiples of 100kpbs
 75  *         (a value of '1' equals to 0.1Mbps, '10' equals 1Mbps, etc).
 76  */
 77 static u32 batadv_v_elp_get_throughput(struct batadv_hardif_neigh_node *neigh)
 78 {
 79         struct batadv_hard_iface *hard_iface = neigh->if_incoming;
 80         struct ethtool_link_ksettings link_settings;
 81         struct net_device *real_netdev;
 82         struct station_info sinfo;
 83         u32 throughput;
 84         int ret;
 85 
 86         /* if the user specified a customised value for this interface, then
 87          * return it directly
 88          */
 89         throughput =  atomic_read(&hard_iface->bat_v.throughput_override);
 90         if (throughput != 0)
 91                 return throughput;
 92 
 93         /* if this is a wireless device, then ask its throughput through
 94          * cfg80211 API
 95          */
 96         if (batadv_is_wifi_hardif(hard_iface)) {
 97                 if (!batadv_is_cfg80211_hardif(hard_iface))
 98                         /* unsupported WiFi driver version */
 99                         goto default_throughput;
100 
101                 real_netdev = batadv_get_real_netdev(hard_iface->net_dev);
102                 if (!real_netdev)
103                         goto default_throughput;
104 
105                 ret = cfg80211_get_station(real_netdev, neigh->addr, &sinfo);
106 
107                 if (!ret) {
108                         /* free the TID stats immediately */
109                         cfg80211_sinfo_release_content(&sinfo);
110                 }
111 
112                 dev_put(real_netdev);
113                 if (ret == -ENOENT) {
114                         /* Node is not associated anymore! It would be
115                          * possible to delete this neighbor. For now set
116                          * the throughput metric to 0.
117                          */
118                         return 0;
119                 }
120                 if (ret)
121                         goto default_throughput;
122                 if (!(sinfo.filled & BIT(NL80211_STA_INFO_EXPECTED_THROUGHPUT)))
123                         goto default_throughput;
124 
125                 return sinfo.expected_throughput / 100;
126         }
127 
128         /* if not a wifi interface, check if this device provides data via
129          * ethtool (e.g. an Ethernet adapter)
130          */
131         memset(&link_settings, 0, sizeof(link_settings));
132         rtnl_lock();
133         ret = __ethtool_get_link_ksettings(hard_iface->net_dev, &link_settings);
134         rtnl_unlock();
135 
136         /* Virtual interface drivers such as tun / tap interfaces, VLAN, etc
137          * tend to initialize the interface throughput with some value for the
138          * sake of having a throughput number to export via ethtool. This
139          * exported throughput leaves batman-adv to conclude the interface
140          * throughput is genuine (reflecting reality), thus no measurements
141          * are necessary.
142          *
143          * Based on the observation that those interface types also tend to set
144          * the link auto-negotiation to 'off', batman-adv shall check this
145          * setting to differentiate between genuine link throughput information
146          * and placeholders installed by virtual interfaces.
147          */
148         if (ret == 0 && link_settings.base.autoneg == AUTONEG_ENABLE) {
149                 /* link characteristics might change over time */
150                 if (link_settings.base.duplex == DUPLEX_FULL)
151                         hard_iface->bat_v.flags |= BATADV_FULL_DUPLEX;
152                 else
153                         hard_iface->bat_v.flags &= ~BATADV_FULL_DUPLEX;
154 
155                 throughput = link_settings.base.speed;
156                 if (throughput && throughput != SPEED_UNKNOWN)
157                         return throughput * 10;
158         }
159 
160 default_throughput:
161         if (!(hard_iface->bat_v.flags & BATADV_WARNING_DEFAULT)) {
162                 batadv_info(hard_iface->soft_iface,
163                             "WiFi driver or ethtool info does not provide information about link speeds on interface %s, therefore defaulting to hardcoded throughput values of %u.%1u Mbps. Consider overriding the throughput manually or checking your driver.\n",
164                             hard_iface->net_dev->name,
165                             BATADV_THROUGHPUT_DEFAULT_VALUE / 10,
166                             BATADV_THROUGHPUT_DEFAULT_VALUE % 10);
167                 hard_iface->bat_v.flags |= BATADV_WARNING_DEFAULT;
168         }
169 
170         /* if none of the above cases apply, return the base_throughput */
171         return BATADV_THROUGHPUT_DEFAULT_VALUE;
172 }
173 
174 /**
175  * batadv_v_elp_throughput_metric_update() - worker updating the throughput
176  *  metric of a single hop neighbour
177  * @work: the work queue item
178  */
179 void batadv_v_elp_throughput_metric_update(struct work_struct *work)
180 {
181         struct batadv_hardif_neigh_node_bat_v *neigh_bat_v;
182         struct batadv_hardif_neigh_node *neigh;
183 
184         neigh_bat_v = container_of(work, struct batadv_hardif_neigh_node_bat_v,
185                                    metric_work);
186         neigh = container_of(neigh_bat_v, struct batadv_hardif_neigh_node,
187                              bat_v);
188 
189         ewma_throughput_add(&neigh->bat_v.throughput,
190                             batadv_v_elp_get_throughput(neigh));
191 
192         /* decrement refcounter to balance increment performed before scheduling
193          * this task
194          */
195         batadv_hardif_neigh_put(neigh);
196 }
197 
198 /**
199  * batadv_v_elp_wifi_neigh_probe() - send link probing packets to a neighbour
200  * @neigh: the neighbour to probe
201  *
202  * Sends a predefined number of unicast wifi packets to a given neighbour in
203  * order to trigger the throughput estimation on this link by the RC algorithm.
204  * Packets are sent only if there there is not enough payload unicast traffic
205  * towards this neighbour..
206  *
207  * Return: True on success and false in case of error during skb preparation.
208  */
209 static bool
210 batadv_v_elp_wifi_neigh_probe(struct batadv_hardif_neigh_node *neigh)
211 {
212         struct batadv_hard_iface *hard_iface = neigh->if_incoming;
213         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
214         unsigned long last_tx_diff;
215         struct sk_buff *skb;
216         int probe_len, i;
217         int elp_skb_len;
218 
219         /* this probing routine is for Wifi neighbours only */
220         if (!batadv_is_wifi_hardif(hard_iface))
221                 return true;
222 
223         /* probe the neighbor only if no unicast packets have been sent
224          * to it in the last 100 milliseconds: this is the rate control
225          * algorithm sampling interval (minstrel). In this way, if not
226          * enough traffic has been sent to the neighbor, batman-adv can
227          * generate 2 probe packets and push the RC algorithm to perform
228          * the sampling
229          */
230         last_tx_diff = jiffies_to_msecs(jiffies - neigh->bat_v.last_unicast_tx);
231         if (last_tx_diff <= BATADV_ELP_PROBE_MAX_TX_DIFF)
232                 return true;
233 
234         probe_len = max_t(int, sizeof(struct batadv_elp_packet),
235                           BATADV_ELP_MIN_PROBE_SIZE);
236 
237         for (i = 0; i < BATADV_ELP_PROBES_PER_NODE; i++) {
238                 elp_skb_len = hard_iface->bat_v.elp_skb->len;
239                 skb = skb_copy_expand(hard_iface->bat_v.elp_skb, 0,
240                                       probe_len - elp_skb_len,
241                                       GFP_ATOMIC);
242                 if (!skb)
243                         return false;
244 
245                 /* Tell the skb to get as big as the allocated space (we want
246                  * the packet to be exactly of that size to make the link
247                  * throughput estimation effective.
248                  */
249                 skb_put_zero(skb, probe_len - hard_iface->bat_v.elp_skb->len);
250 
251                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
252                            "Sending unicast (probe) ELP packet on interface %s to %pM\n",
253                            hard_iface->net_dev->name, neigh->addr);
254 
255                 batadv_send_skb_packet(skb, hard_iface, neigh->addr);
256         }
257 
258         return true;
259 }
260 
261 /**
262  * batadv_v_elp_periodic_work() - ELP periodic task per interface
263  * @work: work queue item
264  *
265  * Emits broadcast ELP message in regular intervals.
266  */
267 static void batadv_v_elp_periodic_work(struct work_struct *work)
268 {
269         struct batadv_hardif_neigh_node *hardif_neigh;
270         struct batadv_hard_iface *hard_iface;
271         struct batadv_hard_iface_bat_v *bat_v;
272         struct batadv_elp_packet *elp_packet;
273         struct batadv_priv *bat_priv;
274         struct sk_buff *skb;
275         u32 elp_interval;
276         bool ret;
277 
278         bat_v = container_of(work, struct batadv_hard_iface_bat_v, elp_wq.work);
279         hard_iface = container_of(bat_v, struct batadv_hard_iface, bat_v);
280         bat_priv = netdev_priv(hard_iface->soft_iface);
281 
282         if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING)
283                 goto out;
284 
285         /* we are in the process of shutting this interface down */
286         if (hard_iface->if_status == BATADV_IF_NOT_IN_USE ||
287             hard_iface->if_status == BATADV_IF_TO_BE_REMOVED)
288                 goto out;
289 
290         /* the interface was enabled but may not be ready yet */
291         if (hard_iface->if_status != BATADV_IF_ACTIVE)
292                 goto restart_timer;
293 
294         skb = skb_copy(hard_iface->bat_v.elp_skb, GFP_ATOMIC);
295         if (!skb)
296                 goto restart_timer;
297 
298         elp_packet = (struct batadv_elp_packet *)skb->data;
299         elp_packet->seqno = htonl(atomic_read(&hard_iface->bat_v.elp_seqno));
300         elp_interval = atomic_read(&hard_iface->bat_v.elp_interval);
301         elp_packet->elp_interval = htonl(elp_interval);
302 
303         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
304                    "Sending broadcast ELP packet on interface %s, seqno %u\n",
305                    hard_iface->net_dev->name,
306                    atomic_read(&hard_iface->bat_v.elp_seqno));
307 
308         batadv_send_broadcast_skb(skb, hard_iface);
309 
310         atomic_inc(&hard_iface->bat_v.elp_seqno);
311 
312         /* The throughput metric is updated on each sent packet. This way, if a
313          * node is dead and no longer sends packets, batman-adv is still able to
314          * react timely to its death.
315          *
316          * The throughput metric is updated by following these steps:
317          * 1) if the hard_iface is wifi => send a number of unicast ELPs for
318          *    probing/sampling to each neighbor
319          * 2) update the throughput metric value of each neighbor (note that the
320          *    value retrieved in this step might be 100ms old because the
321          *    probing packets at point 1) could still be in the HW queue)
322          */
323         rcu_read_lock();
324         hlist_for_each_entry_rcu(hardif_neigh, &hard_iface->neigh_list, list) {
325                 if (!batadv_v_elp_wifi_neigh_probe(hardif_neigh))
326                         /* if something goes wrong while probing, better to stop
327                          * sending packets immediately and reschedule the task
328                          */
329                         break;
330 
331                 if (!kref_get_unless_zero(&hardif_neigh->refcount))
332                         continue;
333 
334                 /* Reading the estimated throughput from cfg80211 is a task that
335                  * may sleep and that is not allowed in an rcu protected
336                  * context. Therefore schedule a task for that.
337                  */
338                 ret = queue_work(batadv_event_workqueue,
339                                  &hardif_neigh->bat_v.metric_work);
340 
341                 if (!ret)
342                         batadv_hardif_neigh_put(hardif_neigh);
343         }
344         rcu_read_unlock();
345 
346 restart_timer:
347         batadv_v_elp_start_timer(hard_iface);
348 out:
349         return;
350 }
351 
352 /**
353  * batadv_v_elp_iface_enable() - setup the ELP interface private resources
354  * @hard_iface: interface for which the data has to be prepared
355  *
356  * Return: 0 on success or a -ENOMEM in case of failure.
357  */
358 int batadv_v_elp_iface_enable(struct batadv_hard_iface *hard_iface)
359 {
360         static const size_t tvlv_padding = sizeof(__be32);
361         struct batadv_elp_packet *elp_packet;
362         unsigned char *elp_buff;
363         u32 random_seqno;
364         size_t size;
365         int res = -ENOMEM;
366 
367         size = ETH_HLEN + NET_IP_ALIGN + BATADV_ELP_HLEN + tvlv_padding;
368         hard_iface->bat_v.elp_skb = dev_alloc_skb(size);
369         if (!hard_iface->bat_v.elp_skb)
370                 goto out;
371 
372         skb_reserve(hard_iface->bat_v.elp_skb, ETH_HLEN + NET_IP_ALIGN);
373         elp_buff = skb_put_zero(hard_iface->bat_v.elp_skb,
374                                 BATADV_ELP_HLEN + tvlv_padding);
375         elp_packet = (struct batadv_elp_packet *)elp_buff;
376 
377         elp_packet->packet_type = BATADV_ELP;
378         elp_packet->version = BATADV_COMPAT_VERSION;
379 
380         /* randomize initial seqno to avoid collision */
381         get_random_bytes(&random_seqno, sizeof(random_seqno));
382         atomic_set(&hard_iface->bat_v.elp_seqno, random_seqno);
383 
384         /* assume full-duplex by default */
385         hard_iface->bat_v.flags |= BATADV_FULL_DUPLEX;
386 
387         /* warn the user (again) if there is no throughput data is available */
388         hard_iface->bat_v.flags &= ~BATADV_WARNING_DEFAULT;
389 
390         if (batadv_is_wifi_hardif(hard_iface))
391                 hard_iface->bat_v.flags &= ~BATADV_FULL_DUPLEX;
392 
393         INIT_DELAYED_WORK(&hard_iface->bat_v.elp_wq,
394                           batadv_v_elp_periodic_work);
395         batadv_v_elp_start_timer(hard_iface);
396         res = 0;
397 
398 out:
399         return res;
400 }
401 
402 /**
403  * batadv_v_elp_iface_disable() - release ELP interface private resources
404  * @hard_iface: interface for which the resources have to be released
405  */
406 void batadv_v_elp_iface_disable(struct batadv_hard_iface *hard_iface)
407 {
408         cancel_delayed_work_sync(&hard_iface->bat_v.elp_wq);
409 
410         dev_kfree_skb(hard_iface->bat_v.elp_skb);
411         hard_iface->bat_v.elp_skb = NULL;
412 }
413 
414 /**
415  * batadv_v_elp_iface_activate() - update the ELP buffer belonging to the given
416  *  hard-interface
417  * @primary_iface: the new primary interface
418  * @hard_iface: interface holding the to-be-updated buffer
419  */
420 void batadv_v_elp_iface_activate(struct batadv_hard_iface *primary_iface,
421                                  struct batadv_hard_iface *hard_iface)
422 {
423         struct batadv_elp_packet *elp_packet;
424         struct sk_buff *skb;
425 
426         if (!hard_iface->bat_v.elp_skb)
427                 return;
428 
429         skb = hard_iface->bat_v.elp_skb;
430         elp_packet = (struct batadv_elp_packet *)skb->data;
431         ether_addr_copy(elp_packet->orig,
432                         primary_iface->net_dev->dev_addr);
433 }
434 
435 /**
436  * batadv_v_elp_primary_iface_set() - change internal data to reflect the new
437  *  primary interface
438  * @primary_iface: the new primary interface
439  */
440 void batadv_v_elp_primary_iface_set(struct batadv_hard_iface *primary_iface)
441 {
442         struct batadv_hard_iface *hard_iface;
443 
444         /* update orig field of every elp iface belonging to this mesh */
445         rcu_read_lock();
446         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
447                 if (primary_iface->soft_iface != hard_iface->soft_iface)
448                         continue;
449 
450                 batadv_v_elp_iface_activate(primary_iface, hard_iface);
451         }
452         rcu_read_unlock();
453 }
454 
455 /**
456  * batadv_v_elp_neigh_update() - update an ELP neighbour node
457  * @bat_priv: the bat priv with all the soft interface information
458  * @neigh_addr: the neighbour interface address
459  * @if_incoming: the interface the packet was received through
460  * @elp_packet: the received ELP packet
461  *
462  * Updates the ELP neighbour node state with the data received within the new
463  * ELP packet.
464  */
465 static void batadv_v_elp_neigh_update(struct batadv_priv *bat_priv,
466                                       u8 *neigh_addr,
467                                       struct batadv_hard_iface *if_incoming,
468                                       struct batadv_elp_packet *elp_packet)
469 
470 {
471         struct batadv_neigh_node *neigh;
472         struct batadv_orig_node *orig_neigh;
473         struct batadv_hardif_neigh_node *hardif_neigh;
474         s32 seqno_diff;
475         s32 elp_latest_seqno;
476 
477         orig_neigh = batadv_v_ogm_orig_get(bat_priv, elp_packet->orig);
478         if (!orig_neigh)
479                 return;
480 
481         neigh = batadv_neigh_node_get_or_create(orig_neigh,
482                                                 if_incoming, neigh_addr);
483         if (!neigh)
484                 goto orig_free;
485 
486         hardif_neigh = batadv_hardif_neigh_get(if_incoming, neigh_addr);
487         if (!hardif_neigh)
488                 goto neigh_free;
489 
490         elp_latest_seqno = hardif_neigh->bat_v.elp_latest_seqno;
491         seqno_diff = ntohl(elp_packet->seqno) - elp_latest_seqno;
492 
493         /* known or older sequence numbers are ignored. However always adopt
494          * if the router seems to have been restarted.
495          */
496         if (seqno_diff < 1 && seqno_diff > -BATADV_ELP_MAX_AGE)
497                 goto hardif_free;
498 
499         neigh->last_seen = jiffies;
500         hardif_neigh->last_seen = jiffies;
501         hardif_neigh->bat_v.elp_latest_seqno = ntohl(elp_packet->seqno);
502         hardif_neigh->bat_v.elp_interval = ntohl(elp_packet->elp_interval);
503 
504 hardif_free:
505         if (hardif_neigh)
506                 batadv_hardif_neigh_put(hardif_neigh);
507 neigh_free:
508         if (neigh)
509                 batadv_neigh_node_put(neigh);
510 orig_free:
511         if (orig_neigh)
512                 batadv_orig_node_put(orig_neigh);
513 }
514 
515 /**
516  * batadv_v_elp_packet_recv() - main ELP packet handler
517  * @skb: the received packet
518  * @if_incoming: the interface this packet was received through
519  *
520  * Return: NET_RX_SUCCESS and consumes the skb if the packet was peoperly
521  * processed or NET_RX_DROP in case of failure.
522  */
523 int batadv_v_elp_packet_recv(struct sk_buff *skb,
524                              struct batadv_hard_iface *if_incoming)
525 {
526         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
527         struct batadv_elp_packet *elp_packet;
528         struct batadv_hard_iface *primary_if;
529         struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb);
530         bool res;
531         int ret = NET_RX_DROP;
532 
533         res = batadv_check_management_packet(skb, if_incoming, BATADV_ELP_HLEN);
534         if (!res)
535                 goto free_skb;
536 
537         if (batadv_is_my_mac(bat_priv, ethhdr->h_source))
538                 goto free_skb;
539 
540         /* did we receive a B.A.T.M.A.N. V ELP packet on an interface
541          * that does not have B.A.T.M.A.N. V ELP enabled ?
542          */
543         if (strcmp(bat_priv->algo_ops->name, "BATMAN_V") != 0)
544                 goto free_skb;
545 
546         elp_packet = (struct batadv_elp_packet *)skb->data;
547 
548         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
549                    "Received ELP packet from %pM seqno %u ORIG: %pM\n",
550                    ethhdr->h_source, ntohl(elp_packet->seqno),
551                    elp_packet->orig);
552 
553         primary_if = batadv_primary_if_get_selected(bat_priv);
554         if (!primary_if)
555                 goto free_skb;
556 
557         batadv_v_elp_neigh_update(bat_priv, ethhdr->h_source, if_incoming,
558                                   elp_packet);
559 
560         ret = NET_RX_SUCCESS;
561         batadv_hardif_put(primary_if);
562 
563 free_skb:
564         if (ret == NET_RX_SUCCESS)
565                 consume_skb(skb);
566         else
567                 kfree_skb(skb);
568 
569         return ret;
570 }
571 

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