1 /* Copyright (C) 2013-2016 B.A.T.M.A.N. contributors:
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.
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.
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/>.
18 #include "bat_v_ogm.h"
21 #include <linux/atomic.h>
22 #include <linux/byteorder/generic.h>
23 #include <linux/errno.h>
24 #include <linux/etherdevice.h>
26 #include <linux/if_ether.h>
27 #include <linux/jiffies.h>
28 #include <linux/kernel.h>
29 #include <linux/kref.h>
30 #include <linux/list.h>
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>
42 #include "hard-interface.h"
44 #include "originator.h"
48 #include "translation-table.h"
51 * batadv_v_ogm_orig_get - retrieve and possibly create an originator node
52 * @bat_priv: the bat priv with all the soft interface information
53 * @addr: the address of the originator
55 * Return: the orig_node corresponding to the specified address. If such object
56 * does not exist it is allocated here. In case of allocation failure returns
59 struct batadv_orig_node *batadv_v_ogm_orig_get(struct batadv_priv *bat_priv,
62 struct batadv_orig_node *orig_node;
65 orig_node = batadv_orig_hash_find(bat_priv, addr);
69 orig_node = batadv_orig_node_new(bat_priv, addr);
73 hash_added = batadv_hash_add(bat_priv->orig_hash, batadv_compare_orig,
74 batadv_choose_orig, orig_node,
75 &orig_node->hash_entry);
76 if (hash_added != 0) {
77 /* orig_node->refcounter is initialised to 2 by
78 * batadv_orig_node_new()
80 batadv_orig_node_put(orig_node);
81 batadv_orig_node_put(orig_node);
89 * batadv_v_ogm_start_timer - restart the OGM sending timer
90 * @bat_priv: the bat priv with all the soft interface information
92 static void batadv_v_ogm_start_timer(struct batadv_priv *bat_priv)
95 /* this function may be invoked in different contexts (ogm rescheduling
96 * or hard_iface activation), but the work timer should not be reset
98 if (delayed_work_pending(&bat_priv->bat_v.ogm_wq))
101 msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER;
102 msecs += prandom_u32() % (2 * BATADV_JITTER);
103 queue_delayed_work(batadv_event_workqueue, &bat_priv->bat_v.ogm_wq,
104 msecs_to_jiffies(msecs));
108 * batadv_v_ogm_send_to_if - send a batman ogm using a given interface
109 * @skb: the OGM to send
110 * @hard_iface: the interface to use to send the OGM
112 static void batadv_v_ogm_send_to_if(struct sk_buff *skb,
113 struct batadv_hard_iface *hard_iface)
115 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
117 if (hard_iface->if_status != BATADV_IF_ACTIVE)
120 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX);
121 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES,
122 skb->len + ETH_HLEN);
124 batadv_send_broadcast_skb(skb, hard_iface);
128 * batadv_v_ogm_send - periodic worker broadcasting the own OGM
129 * @work: work queue item
131 static void batadv_v_ogm_send(struct work_struct *work)
133 struct batadv_hard_iface *hard_iface;
134 struct batadv_priv_bat_v *bat_v;
135 struct batadv_priv *bat_priv;
136 struct batadv_ogm2_packet *ogm_packet;
137 struct sk_buff *skb, *skb_tmp;
138 unsigned char *ogm_buff, *pkt_buff;
142 bat_v = container_of(work, struct batadv_priv_bat_v, ogm_wq.work);
143 bat_priv = container_of(bat_v, struct batadv_priv, bat_v);
145 if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING)
148 ogm_buff = bat_priv->bat_v.ogm_buff;
149 ogm_buff_len = bat_priv->bat_v.ogm_buff_len;
150 /* tt changes have to be committed before the tvlv data is
151 * appended as it may alter the tt tvlv container
153 batadv_tt_local_commit_changes(bat_priv);
154 tvlv_len = batadv_tvlv_container_ogm_append(bat_priv, &ogm_buff,
158 bat_priv->bat_v.ogm_buff = ogm_buff;
159 bat_priv->bat_v.ogm_buff_len = ogm_buff_len;
161 skb = netdev_alloc_skb_ip_align(NULL, ETH_HLEN + ogm_buff_len);
165 skb_reserve(skb, ETH_HLEN);
166 pkt_buff = skb_put(skb, ogm_buff_len);
167 memcpy(pkt_buff, ogm_buff, ogm_buff_len);
169 ogm_packet = (struct batadv_ogm2_packet *)skb->data;
170 ogm_packet->seqno = htonl(atomic_read(&bat_priv->bat_v.ogm_seqno));
171 atomic_inc(&bat_priv->bat_v.ogm_seqno);
172 ogm_packet->tvlv_len = htons(tvlv_len);
174 /* broadcast on every interface */
176 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
177 if (hard_iface->soft_iface != bat_priv->soft_iface)
180 if (!kref_get_unless_zero(&hard_iface->refcount))
183 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
184 "Sending own OGM2 packet (originator %pM, seqno %u, throughput %u, TTL %d) on interface %s [%pM]\n",
185 ogm_packet->orig, ntohl(ogm_packet->seqno),
186 ntohl(ogm_packet->throughput), ogm_packet->ttl,
187 hard_iface->net_dev->name,
188 hard_iface->net_dev->dev_addr);
190 /* this skb gets consumed by batadv_v_ogm_send_to_if() */
191 skb_tmp = skb_clone(skb, GFP_ATOMIC);
193 batadv_hardif_put(hard_iface);
197 batadv_v_ogm_send_to_if(skb_tmp, hard_iface);
198 batadv_hardif_put(hard_iface);
205 batadv_v_ogm_start_timer(bat_priv);
211 * batadv_v_ogm_iface_enable - prepare an interface for B.A.T.M.A.N. V
212 * @hard_iface: the interface to prepare
214 * Takes care of scheduling own OGM sending routine for this interface.
216 * Return: 0 on success or a negative error code otherwise
218 int batadv_v_ogm_iface_enable(struct batadv_hard_iface *hard_iface)
220 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
222 batadv_v_ogm_start_timer(bat_priv);
228 * batadv_v_ogm_primary_iface_set - set a new primary interface
229 * @primary_iface: the new primary interface
231 void batadv_v_ogm_primary_iface_set(struct batadv_hard_iface *primary_iface)
233 struct batadv_priv *bat_priv = netdev_priv(primary_iface->soft_iface);
234 struct batadv_ogm2_packet *ogm_packet;
236 if (!bat_priv->bat_v.ogm_buff)
239 ogm_packet = (struct batadv_ogm2_packet *)bat_priv->bat_v.ogm_buff;
240 ether_addr_copy(ogm_packet->orig, primary_iface->net_dev->dev_addr);
244 * batadv_v_forward_penalty - apply a penalty to the throughput metric forwarded
245 * with B.A.T.M.A.N. V OGMs
246 * @bat_priv: the bat priv with all the soft interface information
247 * @if_incoming: the interface where the OGM has been received
248 * @if_outgoing: the interface where the OGM has to be forwarded to
249 * @throughput: the current throughput
251 * Apply a penalty on the current throughput metric value based on the
252 * characteristic of the interface where the OGM has been received. The return
253 * value is computed as follows:
254 * - throughput * 50% if the incoming and outgoing interface are the
255 * same WiFi interface and the throughput is above
257 * - throughput if the outgoing interface is the default
258 * interface (i.e. this OGM is processed for the
259 * internal table and not forwarded)
260 * - throughput * hop penalty otherwise
262 * Return: the penalised throughput metric.
264 static u32 batadv_v_forward_penalty(struct batadv_priv *bat_priv,
265 struct batadv_hard_iface *if_incoming,
266 struct batadv_hard_iface *if_outgoing,
269 int hop_penalty = atomic_read(&bat_priv->hop_penalty);
270 int hop_penalty_max = BATADV_TQ_MAX_VALUE;
272 /* Don't apply hop penalty in default originator table. */
273 if (if_outgoing == BATADV_IF_DEFAULT)
276 /* Forwarding on the same WiFi interface cuts the throughput in half
277 * due to the store & forward characteristics of WIFI.
278 * Very low throughput values are the exception.
280 if ((throughput > 10) &&
281 (if_incoming == if_outgoing) &&
282 !(if_incoming->bat_v.flags & BATADV_FULL_DUPLEX))
283 return throughput / 2;
285 /* hop penalty of 255 equals 100% */
286 return throughput * (hop_penalty_max - hop_penalty) / hop_penalty_max;
290 * batadv_v_ogm_forward - check conditions and forward an OGM to the given
292 * @bat_priv: the bat priv with all the soft interface information
293 * @ogm_received: previously received OGM to be forwarded
294 * @orig_node: the originator which has been updated
295 * @neigh_node: the neigh_node through with the OGM has been received
296 * @if_incoming: the interface on which this OGM was received on
297 * @if_outgoing: the interface to which the OGM has to be forwarded to
299 * Forward an OGM to an interface after having altered the throughput metric and
300 * the TTL value contained in it. The original OGM isn't modified.
302 static void batadv_v_ogm_forward(struct batadv_priv *bat_priv,
303 const struct batadv_ogm2_packet *ogm_received,
304 struct batadv_orig_node *orig_node,
305 struct batadv_neigh_node *neigh_node,
306 struct batadv_hard_iface *if_incoming,
307 struct batadv_hard_iface *if_outgoing)
309 struct batadv_neigh_ifinfo *neigh_ifinfo = NULL;
310 struct batadv_orig_ifinfo *orig_ifinfo = NULL;
311 struct batadv_neigh_node *router = NULL;
312 struct batadv_ogm2_packet *ogm_forward;
313 unsigned char *skb_buff;
318 /* only forward for specific interfaces, not for the default one. */
319 if (if_outgoing == BATADV_IF_DEFAULT)
322 orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing);
326 /* acquire possibly updated router */
327 router = batadv_orig_router_get(orig_node, if_outgoing);
329 /* strict rule: forward packets coming from the best next hop only */
330 if (neigh_node != router)
333 /* don't forward the same seqno twice on one interface */
334 if (orig_ifinfo->last_seqno_forwarded == ntohl(ogm_received->seqno))
337 orig_ifinfo->last_seqno_forwarded = ntohl(ogm_received->seqno);
339 if (ogm_received->ttl <= 1) {
340 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n");
344 neigh_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing);
348 tvlv_len = ntohs(ogm_received->tvlv_len);
350 packet_len = BATADV_OGM2_HLEN + tvlv_len;
351 skb = netdev_alloc_skb_ip_align(if_outgoing->net_dev,
352 ETH_HLEN + packet_len);
356 skb_reserve(skb, ETH_HLEN);
357 skb_buff = skb_put(skb, packet_len);
358 memcpy(skb_buff, ogm_received, packet_len);
360 /* apply forward penalty */
361 ogm_forward = (struct batadv_ogm2_packet *)skb_buff;
362 ogm_forward->throughput = htonl(neigh_ifinfo->bat_v.throughput);
365 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
366 "Forwarding OGM2 packet on %s: throughput %u, ttl %u, received via %s\n",
367 if_outgoing->net_dev->name, ntohl(ogm_forward->throughput),
368 ogm_forward->ttl, if_incoming->net_dev->name);
370 batadv_v_ogm_send_to_if(skb, if_outgoing);
374 batadv_orig_ifinfo_put(orig_ifinfo);
376 batadv_neigh_node_put(router);
378 batadv_neigh_ifinfo_put(neigh_ifinfo);
382 * batadv_v_ogm_metric_update - update route metric based on OGM
383 * @bat_priv: the bat priv with all the soft interface information
384 * @ogm2: OGM2 structure
385 * @orig_node: Originator structure for which the OGM has been received
386 * @neigh_node: the neigh_node through with the OGM has been received
387 * @if_incoming: the interface where this packet was received
388 * @if_outgoing: the interface for which the packet should be considered
391 * 1 if the OGM is new,
392 * 0 if it is not new but valid,
393 * <0 on error (e.g. old OGM)
395 static int batadv_v_ogm_metric_update(struct batadv_priv *bat_priv,
396 const struct batadv_ogm2_packet *ogm2,
397 struct batadv_orig_node *orig_node,
398 struct batadv_neigh_node *neigh_node,
399 struct batadv_hard_iface *if_incoming,
400 struct batadv_hard_iface *if_outgoing)
402 struct batadv_orig_ifinfo *orig_ifinfo = NULL;
403 struct batadv_neigh_ifinfo *neigh_ifinfo = NULL;
404 bool protection_started = false;
409 orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing);
413 seq_diff = ntohl(ogm2->seqno) - orig_ifinfo->last_real_seqno;
415 if (!hlist_empty(&orig_node->neigh_list) &&
416 batadv_window_protected(bat_priv, seq_diff,
418 &orig_ifinfo->batman_seqno_reset,
419 &protection_started)) {
420 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
421 "Drop packet: packet within window protection time from %pM\n",
423 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
424 "Last reset: %ld, %ld\n",
425 orig_ifinfo->batman_seqno_reset, jiffies);
429 /* drop packets with old seqnos, however accept the first packet after
430 * a host has been rebooted.
432 if ((seq_diff < 0) && !protection_started)
435 neigh_node->last_seen = jiffies;
437 orig_node->last_seen = jiffies;
439 orig_ifinfo->last_real_seqno = ntohl(ogm2->seqno);
440 orig_ifinfo->last_ttl = ogm2->ttl;
442 neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing);
446 path_throughput = batadv_v_forward_penalty(bat_priv, if_incoming,
448 ntohl(ogm2->throughput));
449 neigh_ifinfo->bat_v.throughput = path_throughput;
450 neigh_ifinfo->bat_v.last_seqno = ntohl(ogm2->seqno);
451 neigh_ifinfo->last_ttl = ogm2->ttl;
453 if (seq_diff > 0 || protection_started)
459 batadv_orig_ifinfo_put(orig_ifinfo);
461 batadv_neigh_ifinfo_put(neigh_ifinfo);
467 * batadv_v_ogm_route_update - update routes based on OGM
468 * @bat_priv: the bat priv with all the soft interface information
469 * @ethhdr: the Ethernet header of the OGM2
470 * @ogm2: OGM2 structure
471 * @orig_node: Originator structure for which the OGM has been received
472 * @neigh_node: the neigh_node through with the OGM has been received
473 * @if_incoming: the interface where this packet was received
474 * @if_outgoing: the interface for which the packet should be considered
476 * Return: true if the packet should be forwarded, false otherwise
478 static bool batadv_v_ogm_route_update(struct batadv_priv *bat_priv,
479 const struct ethhdr *ethhdr,
480 const struct batadv_ogm2_packet *ogm2,
481 struct batadv_orig_node *orig_node,
482 struct batadv_neigh_node *neigh_node,
483 struct batadv_hard_iface *if_incoming,
484 struct batadv_hard_iface *if_outgoing)
486 struct batadv_neigh_node *router = NULL;
487 struct batadv_orig_node *orig_neigh_node = NULL;
488 struct batadv_neigh_node *orig_neigh_router = NULL;
489 struct batadv_neigh_ifinfo *router_ifinfo = NULL, *neigh_ifinfo = NULL;
490 u32 router_throughput, neigh_throughput;
491 u32 router_last_seqno;
492 u32 neigh_last_seqno;
494 bool forward = false;
496 orig_neigh_node = batadv_v_ogm_orig_get(bat_priv, ethhdr->h_source);
497 if (!orig_neigh_node)
500 orig_neigh_router = batadv_orig_router_get(orig_neigh_node,
503 /* drop packet if sender is not a direct neighbor and if we
504 * don't route towards it
506 router = batadv_orig_router_get(orig_node, if_outgoing);
507 if (router && router->orig_node != orig_node && !orig_neigh_router) {
508 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
509 "Drop packet: OGM via unknown neighbor!\n");
513 /* Mark the OGM to be considered for forwarding, and update routes
518 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
519 "Searching and updating originator entry of received packet\n");
521 /* if this neighbor already is our next hop there is nothing
524 if (router == neigh_node)
527 /* don't consider neighbours with worse throughput.
528 * also switch route if this seqno is BATADV_V_MAX_ORIGDIFF newer than
529 * the last received seqno from our best next hop.
532 router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing);
533 neigh_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing);
535 /* if these are not allocated, something is wrong. */
536 if (!router_ifinfo || !neigh_ifinfo)
539 neigh_last_seqno = neigh_ifinfo->bat_v.last_seqno;
540 router_last_seqno = router_ifinfo->bat_v.last_seqno;
541 neigh_seq_diff = neigh_last_seqno - router_last_seqno;
542 router_throughput = router_ifinfo->bat_v.throughput;
543 neigh_throughput = neigh_ifinfo->bat_v.throughput;
545 if ((neigh_seq_diff < BATADV_OGM_MAX_ORIGDIFF) &&
546 (router_throughput >= neigh_throughput))
550 batadv_update_route(bat_priv, orig_node, if_outgoing, neigh_node);
553 batadv_neigh_node_put(router);
554 if (orig_neigh_router)
555 batadv_neigh_node_put(orig_neigh_router);
557 batadv_orig_node_put(orig_neigh_node);
559 batadv_neigh_ifinfo_put(router_ifinfo);
561 batadv_neigh_ifinfo_put(neigh_ifinfo);
567 * batadv_v_ogm_process_per_outif - process a batman v OGM for an outgoing if
568 * @bat_priv: the bat priv with all the soft interface information
569 * @ethhdr: the Ethernet header of the OGM2
570 * @ogm2: OGM2 structure
571 * @orig_node: Originator structure for which the OGM has been received
572 * @neigh_node: the neigh_node through with the OGM has been received
573 * @if_incoming: the interface where this packet was received
574 * @if_outgoing: the interface for which the packet should be considered
577 batadv_v_ogm_process_per_outif(struct batadv_priv *bat_priv,
578 const struct ethhdr *ethhdr,
579 const struct batadv_ogm2_packet *ogm2,
580 struct batadv_orig_node *orig_node,
581 struct batadv_neigh_node *neigh_node,
582 struct batadv_hard_iface *if_incoming,
583 struct batadv_hard_iface *if_outgoing)
588 /* first, update the metric with according sanity checks */
589 seqno_age = batadv_v_ogm_metric_update(bat_priv, ogm2, orig_node,
590 neigh_node, if_incoming,
593 /* outdated sequence numbers are to be discarded */
597 /* only unknown & newer OGMs contain TVLVs we are interested in */
598 if ((seqno_age > 0) && (if_outgoing == BATADV_IF_DEFAULT))
599 batadv_tvlv_containers_process(bat_priv, true, orig_node,
601 (unsigned char *)(ogm2 + 1),
602 ntohs(ogm2->tvlv_len));
604 /* if the metric update went through, update routes if needed */
605 forward = batadv_v_ogm_route_update(bat_priv, ethhdr, ogm2, orig_node,
606 neigh_node, if_incoming,
609 /* if the routes have been processed correctly, check and forward */
611 batadv_v_ogm_forward(bat_priv, ogm2, orig_node, neigh_node,
612 if_incoming, if_outgoing);
616 * batadv_v_ogm_aggr_packet - checks if there is another OGM aggregated
617 * @buff_pos: current position in the skb
618 * @packet_len: total length of the skb
619 * @tvlv_len: tvlv length of the previously considered OGM
621 * Return: true if there is enough space for another OGM, false otherwise.
623 static bool batadv_v_ogm_aggr_packet(int buff_pos, int packet_len,
626 int next_buff_pos = 0;
628 next_buff_pos += buff_pos + BATADV_OGM2_HLEN;
629 next_buff_pos += ntohs(tvlv_len);
631 return (next_buff_pos <= packet_len) &&
632 (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES);
636 * batadv_v_ogm_process - process an incoming batman v OGM
637 * @skb: the skb containing the OGM
638 * @ogm_offset: offset to the OGM which should be processed (for aggregates)
639 * @if_incoming: the interface where this packet was receved
641 static void batadv_v_ogm_process(const struct sk_buff *skb, int ogm_offset,
642 struct batadv_hard_iface *if_incoming)
644 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
645 struct ethhdr *ethhdr;
646 struct batadv_orig_node *orig_node = NULL;
647 struct batadv_hardif_neigh_node *hardif_neigh = NULL;
648 struct batadv_neigh_node *neigh_node = NULL;
649 struct batadv_hard_iface *hard_iface;
650 struct batadv_ogm2_packet *ogm_packet;
651 u32 ogm_throughput, link_throughput, path_throughput;
653 ethhdr = eth_hdr(skb);
654 ogm_packet = (struct batadv_ogm2_packet *)(skb->data + ogm_offset);
656 ogm_throughput = ntohl(ogm_packet->throughput);
658 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
659 "Received OGM2 packet via NB: %pM, IF: %s [%pM] (from OG: %pM, seqno %u, troughput %u, TTL %u, V %u, tvlv_len %u)\n",
660 ethhdr->h_source, if_incoming->net_dev->name,
661 if_incoming->net_dev->dev_addr, ogm_packet->orig,
662 ntohl(ogm_packet->seqno), ogm_throughput, ogm_packet->ttl,
663 ogm_packet->version, ntohs(ogm_packet->tvlv_len));
665 /* If the troughput metric is 0, immediately drop the packet. No need to
666 * create orig_node / neigh_node for an unusable route.
668 if (ogm_throughput == 0) {
669 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
670 "Drop packet: originator packet with troughput metric of 0\n");
674 /* require ELP packets be to received from this neighbor first */
675 hardif_neigh = batadv_hardif_neigh_get(if_incoming, ethhdr->h_source);
677 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
678 "Drop packet: OGM via unknown neighbor!\n");
682 orig_node = batadv_v_ogm_orig_get(bat_priv, ogm_packet->orig);
686 neigh_node = batadv_neigh_node_new(orig_node, if_incoming,
691 /* Update the received throughput metric to match the link
693 * - If this OGM traveled one hop so far (emitted by single hop
694 * neighbor) the path throughput metric equals the link throughput.
695 * - For OGMs traversing more than hop the path throughput metric is
696 * the smaller of the path throughput and the link throughput.
698 link_throughput = ewma_throughput_read(&hardif_neigh->bat_v.throughput);
699 path_throughput = min_t(u32, link_throughput, ogm_throughput);
700 ogm_packet->throughput = htonl(path_throughput);
702 batadv_v_ogm_process_per_outif(bat_priv, ethhdr, ogm_packet, orig_node,
703 neigh_node, if_incoming,
707 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
708 if (hard_iface->if_status != BATADV_IF_ACTIVE)
711 if (hard_iface->soft_iface != bat_priv->soft_iface)
714 if (!kref_get_unless_zero(&hard_iface->refcount))
717 batadv_v_ogm_process_per_outif(bat_priv, ethhdr, ogm_packet,
718 orig_node, neigh_node,
719 if_incoming, hard_iface);
721 batadv_hardif_put(hard_iface);
726 batadv_orig_node_put(orig_node);
728 batadv_neigh_node_put(neigh_node);
730 batadv_hardif_neigh_put(hardif_neigh);
734 * batadv_v_ogm_packet_recv - OGM2 receiving handler
735 * @skb: the received OGM
736 * @if_incoming: the interface where this OGM has been received
738 * Return: NET_RX_SUCCESS and consume the skb on success or returns NET_RX_DROP
739 * (without freeing the skb) on failure
741 int batadv_v_ogm_packet_recv(struct sk_buff *skb,
742 struct batadv_hard_iface *if_incoming)
744 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
745 struct batadv_ogm2_packet *ogm_packet;
746 struct ethhdr *ethhdr = eth_hdr(skb);
749 int ret = NET_RX_DROP;
751 /* did we receive a OGM2 packet on an interface that does not have
752 * B.A.T.M.A.N. V enabled ?
754 if (strcmp(bat_priv->bat_algo_ops->name, "BATMAN_V") != 0)
757 if (!batadv_check_management_packet(skb, if_incoming, BATADV_OGM2_HLEN))
760 if (batadv_is_my_mac(bat_priv, ethhdr->h_source))
763 ogm_packet = (struct batadv_ogm2_packet *)skb->data;
765 if (batadv_is_my_mac(bat_priv, ogm_packet->orig))
768 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX);
769 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES,
770 skb->len + ETH_HLEN);
773 ogm_packet = (struct batadv_ogm2_packet *)skb->data;
775 while (batadv_v_ogm_aggr_packet(ogm_offset, skb_headlen(skb),
776 ogm_packet->tvlv_len)) {
777 batadv_v_ogm_process(skb, ogm_offset, if_incoming);
779 ogm_offset += BATADV_OGM2_HLEN;
780 ogm_offset += ntohs(ogm_packet->tvlv_len);
782 packet_pos = skb->data + ogm_offset;
783 ogm_packet = (struct batadv_ogm2_packet *)packet_pos;
786 ret = NET_RX_SUCCESS;
793 * batadv_v_ogm_init - initialise the OGM2 engine
794 * @bat_priv: the bat priv with all the soft interface information
796 * Return: 0 on success or a negative error code in case of failure
798 int batadv_v_ogm_init(struct batadv_priv *bat_priv)
800 struct batadv_ogm2_packet *ogm_packet;
801 unsigned char *ogm_buff;
804 bat_priv->bat_v.ogm_buff_len = BATADV_OGM2_HLEN;
805 ogm_buff = kzalloc(bat_priv->bat_v.ogm_buff_len, GFP_ATOMIC);
809 bat_priv->bat_v.ogm_buff = ogm_buff;
810 ogm_packet = (struct batadv_ogm2_packet *)ogm_buff;
811 ogm_packet->packet_type = BATADV_OGM2;
812 ogm_packet->version = BATADV_COMPAT_VERSION;
813 ogm_packet->ttl = BATADV_TTL;
814 ogm_packet->flags = BATADV_NO_FLAGS;
815 ogm_packet->throughput = htonl(BATADV_THROUGHPUT_MAX_VALUE);
817 /* randomize initial seqno to avoid collision */
818 get_random_bytes(&random_seqno, sizeof(random_seqno));
819 atomic_set(&bat_priv->bat_v.ogm_seqno, random_seqno);
820 INIT_DELAYED_WORK(&bat_priv->bat_v.ogm_wq, batadv_v_ogm_send);
826 * batadv_v_ogm_free - free OGM private resources
827 * @bat_priv: the bat priv with all the soft interface information
829 void batadv_v_ogm_free(struct batadv_priv *bat_priv)
831 cancel_delayed_work_sync(&bat_priv->bat_v.ogm_wq);
833 kfree(bat_priv->bat_v.ogm_buff);
834 bat_priv->bat_v.ogm_buff = NULL;
835 bat_priv->bat_v.ogm_buff_len = 0;