1 /* Copyright (C) 2009-2013 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/>.
20 #include "gateway_client.h"
21 #include "gateway_common.h"
22 #include "hard-interface.h"
23 #include "originator.h"
24 #include "translation-table.h"
27 #include <linux/ipv6.h>
28 #include <linux/udp.h>
29 #include <linux/if_vlan.h>
31 /* These are the offsets of the "hw type" and "hw address length" in the dhcp
32 * packet starting at the beginning of the dhcp header
34 #define BATADV_DHCP_HTYPE_OFFSET 1
35 #define BATADV_DHCP_HLEN_OFFSET 2
36 /* Value of htype representing Ethernet */
37 #define BATADV_DHCP_HTYPE_ETHERNET 0x01
38 /* This is the offset of the "chaddr" field in the dhcp packet starting at the
39 * beginning of the dhcp header
41 #define BATADV_DHCP_CHADDR_OFFSET 28
43 static void batadv_gw_node_free_ref(struct batadv_gw_node *gw_node)
45 if (atomic_dec_and_test(&gw_node->refcount))
46 kfree_rcu(gw_node, rcu);
49 static struct batadv_gw_node *
50 batadv_gw_get_selected_gw_node(struct batadv_priv *bat_priv)
52 struct batadv_gw_node *gw_node;
55 gw_node = rcu_dereference(bat_priv->gw.curr_gw);
59 if (!atomic_inc_not_zero(&gw_node->refcount))
67 struct batadv_orig_node *
68 batadv_gw_get_selected_orig(struct batadv_priv *bat_priv)
70 struct batadv_gw_node *gw_node;
71 struct batadv_orig_node *orig_node = NULL;
73 gw_node = batadv_gw_get_selected_gw_node(bat_priv);
78 orig_node = gw_node->orig_node;
82 if (!atomic_inc_not_zero(&orig_node->refcount))
89 batadv_gw_node_free_ref(gw_node);
93 static void batadv_gw_select(struct batadv_priv *bat_priv,
94 struct batadv_gw_node *new_gw_node)
96 struct batadv_gw_node *curr_gw_node;
98 spin_lock_bh(&bat_priv->gw.list_lock);
100 if (new_gw_node && !atomic_inc_not_zero(&new_gw_node->refcount))
103 curr_gw_node = rcu_dereference_protected(bat_priv->gw.curr_gw, 1);
104 rcu_assign_pointer(bat_priv->gw.curr_gw, new_gw_node);
107 batadv_gw_node_free_ref(curr_gw_node);
109 spin_unlock_bh(&bat_priv->gw.list_lock);
113 * batadv_gw_reselect - force a gateway reselection
114 * @bat_priv: the bat priv with all the soft interface information
116 * Set a flag to remind the GW component to perform a new gateway reselection.
117 * However this function does not ensure that the current gateway is going to be
118 * deselected. The reselection mechanism may elect the same gateway once again.
120 * This means that invoking batadv_gw_reselect() does not guarantee a gateway
121 * change and therefore a uevent is not necessarily expected.
123 void batadv_gw_reselect(struct batadv_priv *bat_priv)
125 atomic_set(&bat_priv->gw.reselect, 1);
128 static struct batadv_gw_node *
129 batadv_gw_get_best_gw_node(struct batadv_priv *bat_priv)
131 struct batadv_neigh_node *router;
132 struct batadv_gw_node *gw_node, *curr_gw = NULL;
133 uint32_t max_gw_factor = 0, tmp_gw_factor = 0;
137 struct batadv_orig_node *orig_node;
139 gw_divisor = BATADV_TQ_LOCAL_WINDOW_SIZE * BATADV_TQ_LOCAL_WINDOW_SIZE;
143 hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.list, list) {
144 if (gw_node->deleted)
147 orig_node = gw_node->orig_node;
148 router = batadv_orig_node_get_router(orig_node);
152 if (!atomic_inc_not_zero(&gw_node->refcount))
155 tq_avg = router->bat_iv.tq_avg;
157 switch (atomic_read(&bat_priv->gw_sel_class)) {
158 case 1: /* fast connection */
159 tmp_gw_factor = tq_avg * tq_avg;
160 tmp_gw_factor *= gw_node->bandwidth_down;
161 tmp_gw_factor *= 100 * 100;
162 tmp_gw_factor /= gw_divisor;
164 if ((tmp_gw_factor > max_gw_factor) ||
165 ((tmp_gw_factor == max_gw_factor) &&
166 (tq_avg > max_tq))) {
168 batadv_gw_node_free_ref(curr_gw);
170 atomic_inc(&curr_gw->refcount);
174 default: /* 2: stable connection (use best statistic)
175 * 3: fast-switch (use best statistic but change as
176 * soon as a better gateway appears)
177 * XX: late-switch (use best statistic but change as
178 * soon as a better gateway appears which has
179 * $routing_class more tq points)
181 if (tq_avg > max_tq) {
183 batadv_gw_node_free_ref(curr_gw);
185 atomic_inc(&curr_gw->refcount);
193 if (tmp_gw_factor > max_gw_factor)
194 max_gw_factor = tmp_gw_factor;
196 batadv_gw_node_free_ref(gw_node);
199 batadv_neigh_node_free_ref(router);
207 * batadv_gw_check_client_stop - check if client mode has been switched off
208 * @bat_priv: the bat priv with all the soft interface information
210 * This function assumes the caller has checked that the gw state *is actually
211 * changing*. This function is not supposed to be called when there is no state
214 void batadv_gw_check_client_stop(struct batadv_priv *bat_priv)
216 struct batadv_gw_node *curr_gw;
218 if (atomic_read(&bat_priv->gw_mode) != BATADV_GW_MODE_CLIENT)
221 curr_gw = batadv_gw_get_selected_gw_node(bat_priv);
225 /* deselect the current gateway so that next time that client mode is
226 * enabled a proper GW_ADD event can be sent
228 batadv_gw_select(bat_priv, NULL);
230 /* if batman-adv is switching the gw client mode off and a gateway was
231 * already selected, send a DEL uevent
233 batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL, NULL);
235 batadv_gw_node_free_ref(curr_gw);
238 void batadv_gw_election(struct batadv_priv *bat_priv)
240 struct batadv_gw_node *curr_gw = NULL, *next_gw = NULL;
241 struct batadv_neigh_node *router = NULL;
242 char gw_addr[18] = { '\0' };
244 if (atomic_read(&bat_priv->gw_mode) != BATADV_GW_MODE_CLIENT)
247 curr_gw = batadv_gw_get_selected_gw_node(bat_priv);
249 if (!batadv_atomic_dec_not_zero(&bat_priv->gw.reselect) && curr_gw)
252 next_gw = batadv_gw_get_best_gw_node(bat_priv);
254 if (curr_gw == next_gw)
258 sprintf(gw_addr, "%pM", next_gw->orig_node->orig);
260 router = batadv_orig_node_get_router(next_gw->orig_node);
262 batadv_gw_reselect(bat_priv);
267 if ((curr_gw) && (!next_gw)) {
268 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
269 "Removing selected gateway - no gateway in range\n");
270 batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL,
272 } else if ((!curr_gw) && (next_gw)) {
273 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
274 "Adding route to gateway %pM (bandwidth: %u.%u/%u.%u MBit, tq: %i)\n",
275 next_gw->orig_node->orig,
276 next_gw->bandwidth_down / 10,
277 next_gw->bandwidth_down % 10,
278 next_gw->bandwidth_up / 10,
279 next_gw->bandwidth_up % 10, router->bat_iv.tq_avg);
280 batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_ADD,
283 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
284 "Changing route to gateway %pM (bandwidth: %u.%u/%u.%u MBit, tq: %i)\n",
285 next_gw->orig_node->orig,
286 next_gw->bandwidth_down / 10,
287 next_gw->bandwidth_down % 10,
288 next_gw->bandwidth_up / 10,
289 next_gw->bandwidth_up % 10, router->bat_iv.tq_avg);
290 batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_CHANGE,
294 batadv_gw_select(bat_priv, next_gw);
298 batadv_gw_node_free_ref(curr_gw);
300 batadv_gw_node_free_ref(next_gw);
302 batadv_neigh_node_free_ref(router);
305 void batadv_gw_check_election(struct batadv_priv *bat_priv,
306 struct batadv_orig_node *orig_node)
308 struct batadv_orig_node *curr_gw_orig;
309 struct batadv_neigh_node *router_gw = NULL, *router_orig = NULL;
310 uint8_t gw_tq_avg, orig_tq_avg;
312 curr_gw_orig = batadv_gw_get_selected_orig(bat_priv);
316 router_gw = batadv_orig_node_get_router(curr_gw_orig);
320 /* this node already is the gateway */
321 if (curr_gw_orig == orig_node)
324 router_orig = batadv_orig_node_get_router(orig_node);
328 gw_tq_avg = router_gw->bat_iv.tq_avg;
329 orig_tq_avg = router_orig->bat_iv.tq_avg;
331 /* the TQ value has to be better */
332 if (orig_tq_avg < gw_tq_avg)
335 /* if the routing class is greater than 3 the value tells us how much
336 * greater the TQ value of the new gateway must be
338 if ((atomic_read(&bat_priv->gw_sel_class) > 3) &&
339 (orig_tq_avg - gw_tq_avg < atomic_read(&bat_priv->gw_sel_class)))
342 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
343 "Restarting gateway selection: better gateway found (tq curr: %i, tq new: %i)\n",
344 gw_tq_avg, orig_tq_avg);
347 batadv_gw_reselect(bat_priv);
350 batadv_orig_node_free_ref(curr_gw_orig);
352 batadv_neigh_node_free_ref(router_gw);
354 batadv_neigh_node_free_ref(router_orig);
360 * batadv_gw_node_add - add gateway node to list of available gateways
361 * @bat_priv: the bat priv with all the soft interface information
362 * @orig_node: originator announcing gateway capabilities
363 * @gateway: announced bandwidth information
365 static void batadv_gw_node_add(struct batadv_priv *bat_priv,
366 struct batadv_orig_node *orig_node,
367 struct batadv_tvlv_gateway_data *gateway)
369 struct batadv_gw_node *gw_node;
371 if (gateway->bandwidth_down == 0)
374 gw_node = kzalloc(sizeof(*gw_node), GFP_ATOMIC);
378 INIT_HLIST_NODE(&gw_node->list);
379 gw_node->orig_node = orig_node;
380 atomic_set(&gw_node->refcount, 1);
382 spin_lock_bh(&bat_priv->gw.list_lock);
383 hlist_add_head_rcu(&gw_node->list, &bat_priv->gw.list);
384 spin_unlock_bh(&bat_priv->gw.list_lock);
386 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
387 "Found new gateway %pM -> gw bandwidth: %u.%u/%u.%u MBit\n",
389 ntohl(gateway->bandwidth_down) / 10,
390 ntohl(gateway->bandwidth_down) % 10,
391 ntohl(gateway->bandwidth_up) / 10,
392 ntohl(gateway->bandwidth_up) % 10);
396 * batadv_gw_node_get - retrieve gateway node from list of available gateways
397 * @bat_priv: the bat priv with all the soft interface information
398 * @orig_node: originator announcing gateway capabilities
400 * Returns gateway node if found or NULL otherwise.
402 static struct batadv_gw_node *
403 batadv_gw_node_get(struct batadv_priv *bat_priv,
404 struct batadv_orig_node *orig_node)
406 struct batadv_gw_node *gw_node_tmp, *gw_node = NULL;
409 hlist_for_each_entry_rcu(gw_node_tmp, &bat_priv->gw.list, list) {
410 if (gw_node_tmp->orig_node != orig_node)
413 if (gw_node_tmp->deleted)
416 if (!atomic_inc_not_zero(&gw_node_tmp->refcount))
419 gw_node = gw_node_tmp;
428 * batadv_gw_node_update - update list of available gateways with changed
429 * bandwidth information
430 * @bat_priv: the bat priv with all the soft interface information
431 * @orig_node: originator announcing gateway capabilities
432 * @gateway: announced bandwidth information
434 void batadv_gw_node_update(struct batadv_priv *bat_priv,
435 struct batadv_orig_node *orig_node,
436 struct batadv_tvlv_gateway_data *gateway)
438 struct batadv_gw_node *gw_node, *curr_gw = NULL;
440 gw_node = batadv_gw_node_get(bat_priv, orig_node);
442 batadv_gw_node_add(bat_priv, orig_node, gateway);
446 if ((gw_node->bandwidth_down == ntohl(gateway->bandwidth_down)) &&
447 (gw_node->bandwidth_up == ntohl(gateway->bandwidth_up)))
450 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
451 "Gateway bandwidth of originator %pM changed from %u.%u/%u.%u MBit to %u.%u/%u.%u MBit\n",
453 gw_node->bandwidth_down / 10,
454 gw_node->bandwidth_down % 10,
455 gw_node->bandwidth_up / 10,
456 gw_node->bandwidth_up % 10,
457 ntohl(gateway->bandwidth_down) / 10,
458 ntohl(gateway->bandwidth_down) % 10,
459 ntohl(gateway->bandwidth_up) / 10,
460 ntohl(gateway->bandwidth_up) % 10);
462 gw_node->bandwidth_down = ntohl(gateway->bandwidth_down);
463 gw_node->bandwidth_up = ntohl(gateway->bandwidth_up);
465 gw_node->deleted = 0;
466 if (ntohl(gateway->bandwidth_down) == 0) {
467 gw_node->deleted = jiffies;
468 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
469 "Gateway %pM removed from gateway list\n",
472 /* Note: We don't need a NULL check here, since curr_gw never
475 curr_gw = batadv_gw_get_selected_gw_node(bat_priv);
476 if (gw_node == curr_gw)
477 batadv_gw_reselect(bat_priv);
482 batadv_gw_node_free_ref(curr_gw);
484 batadv_gw_node_free_ref(gw_node);
487 void batadv_gw_node_delete(struct batadv_priv *bat_priv,
488 struct batadv_orig_node *orig_node)
490 struct batadv_tvlv_gateway_data gateway;
492 gateway.bandwidth_down = 0;
493 gateway.bandwidth_up = 0;
495 batadv_gw_node_update(bat_priv, orig_node, &gateway);
498 void batadv_gw_node_purge(struct batadv_priv *bat_priv)
500 struct batadv_gw_node *gw_node, *curr_gw;
501 struct hlist_node *node_tmp;
502 unsigned long timeout = msecs_to_jiffies(2 * BATADV_PURGE_TIMEOUT);
505 curr_gw = batadv_gw_get_selected_gw_node(bat_priv);
507 spin_lock_bh(&bat_priv->gw.list_lock);
509 hlist_for_each_entry_safe(gw_node, node_tmp,
510 &bat_priv->gw.list, list) {
511 if (((!gw_node->deleted) ||
512 (time_before(jiffies, gw_node->deleted + timeout))) &&
513 atomic_read(&bat_priv->mesh_state) == BATADV_MESH_ACTIVE)
516 if (curr_gw == gw_node)
519 hlist_del_rcu(&gw_node->list);
520 batadv_gw_node_free_ref(gw_node);
523 spin_unlock_bh(&bat_priv->gw.list_lock);
525 /* gw_reselect() needs to acquire the gw_list_lock */
527 batadv_gw_reselect(bat_priv);
530 batadv_gw_node_free_ref(curr_gw);
533 /* fails if orig_node has no router */
534 static int batadv_write_buffer_text(struct batadv_priv *bat_priv,
535 struct seq_file *seq,
536 const struct batadv_gw_node *gw_node)
538 struct batadv_gw_node *curr_gw;
539 struct batadv_neigh_node *router;
542 router = batadv_orig_node_get_router(gw_node->orig_node);
546 curr_gw = batadv_gw_get_selected_gw_node(bat_priv);
548 ret = seq_printf(seq, "%s %pM (%3i) %pM [%10s]: %u.%u/%u.%u MBit\n",
549 (curr_gw == gw_node ? "=>" : " "),
550 gw_node->orig_node->orig,
551 router->bat_iv.tq_avg, router->addr,
552 router->if_incoming->net_dev->name,
553 gw_node->bandwidth_down / 10,
554 gw_node->bandwidth_down % 10,
555 gw_node->bandwidth_up / 10,
556 gw_node->bandwidth_up % 10);
558 batadv_neigh_node_free_ref(router);
560 batadv_gw_node_free_ref(curr_gw);
565 int batadv_gw_client_seq_print_text(struct seq_file *seq, void *offset)
567 struct net_device *net_dev = (struct net_device *)seq->private;
568 struct batadv_priv *bat_priv = netdev_priv(net_dev);
569 struct batadv_hard_iface *primary_if;
570 struct batadv_gw_node *gw_node;
573 primary_if = batadv_seq_print_text_primary_if_get(seq);
578 " %-12s (%s/%i) %17s [%10s]: advertised uplink bandwidth ... [B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s)]\n",
579 "Gateway", "#", BATADV_TQ_MAX_VALUE, "Nexthop", "outgoingIF",
580 BATADV_SOURCE_VERSION, primary_if->net_dev->name,
581 primary_if->net_dev->dev_addr, net_dev->name);
584 hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.list, list) {
585 if (gw_node->deleted)
588 /* fails if orig_node has no router */
589 if (batadv_write_buffer_text(bat_priv, seq, gw_node) < 0)
597 seq_puts(seq, "No gateways in range ...\n");
601 batadv_hardif_free_ref(primary_if);
606 * batadv_gw_dhcp_recipient_get - check if a packet is a DHCP message
607 * @skb: the packet to check
608 * @header_len: a pointer to the batman-adv header size
609 * @chaddr: buffer where the client address will be stored. Valid
610 * only if the function returns BATADV_DHCP_TO_CLIENT
613 * - BATADV_DHCP_NO if the packet is not a dhcp message or if there was an error
615 * - BATADV_DHCP_TO_SERVER if this is a message going to the DHCP server
616 * - BATADV_DHCP_TO_CLIENT if this is a message going to a DHCP client
618 * This function may re-allocate the data buffer of the skb passed as argument.
620 enum batadv_dhcp_recipient
621 batadv_gw_dhcp_recipient_get(struct sk_buff *skb, unsigned int *header_len,
624 enum batadv_dhcp_recipient ret = BATADV_DHCP_NO;
625 struct ethhdr *ethhdr;
627 struct ipv6hdr *ipv6hdr;
628 struct udphdr *udphdr;
629 struct vlan_ethhdr *vhdr;
634 /* check for ethernet header */
635 if (!pskb_may_pull(skb, *header_len + ETH_HLEN))
636 return BATADV_DHCP_NO;
638 ethhdr = (struct ethhdr *)skb->data;
639 proto = ethhdr->h_proto;
640 *header_len += ETH_HLEN;
642 /* check for initial vlan header */
643 if (proto == htons(ETH_P_8021Q)) {
644 if (!pskb_may_pull(skb, *header_len + VLAN_HLEN))
645 return BATADV_DHCP_NO;
647 vhdr = (struct vlan_ethhdr *)skb->data;
648 proto = vhdr->h_vlan_encapsulated_proto;
649 *header_len += VLAN_HLEN;
652 /* check for ip header */
654 case htons(ETH_P_IP):
655 if (!pskb_may_pull(skb, *header_len + sizeof(*iphdr)))
656 return BATADV_DHCP_NO;
658 iphdr = (struct iphdr *)(skb->data + *header_len);
659 *header_len += iphdr->ihl * 4;
661 /* check for udp header */
662 if (iphdr->protocol != IPPROTO_UDP)
663 return BATADV_DHCP_NO;
666 case htons(ETH_P_IPV6):
667 if (!pskb_may_pull(skb, *header_len + sizeof(*ipv6hdr)))
668 return BATADV_DHCP_NO;
670 ipv6hdr = (struct ipv6hdr *)(skb->data + *header_len);
671 *header_len += sizeof(*ipv6hdr);
673 /* check for udp header */
674 if (ipv6hdr->nexthdr != IPPROTO_UDP)
675 return BATADV_DHCP_NO;
679 return BATADV_DHCP_NO;
682 if (!pskb_may_pull(skb, *header_len + sizeof(*udphdr)))
683 return BATADV_DHCP_NO;
685 /* skb->data might have been reallocated by pskb_may_pull() */
686 ethhdr = (struct ethhdr *)skb->data;
687 if (ntohs(ethhdr->h_proto) == ETH_P_8021Q)
688 ethhdr = (struct ethhdr *)(skb->data + VLAN_HLEN);
690 udphdr = (struct udphdr *)(skb->data + *header_len);
691 *header_len += sizeof(*udphdr);
693 /* check for bootp port */
695 case htons(ETH_P_IP):
696 if (udphdr->dest == htons(67))
697 ret = BATADV_DHCP_TO_SERVER;
698 else if (udphdr->source == htons(67))
699 ret = BATADV_DHCP_TO_CLIENT;
701 case htons(ETH_P_IPV6):
702 if (udphdr->dest == htons(547))
703 ret = BATADV_DHCP_TO_SERVER;
704 else if (udphdr->source == htons(547))
705 ret = BATADV_DHCP_TO_CLIENT;
709 chaddr_offset = *header_len + BATADV_DHCP_CHADDR_OFFSET;
710 /* store the client address if the message is going to a client */
711 if (ret == BATADV_DHCP_TO_CLIENT &&
712 pskb_may_pull(skb, chaddr_offset + ETH_ALEN)) {
713 /* check if the DHCP packet carries an Ethernet DHCP */
714 p = skb->data + *header_len + BATADV_DHCP_HTYPE_OFFSET;
715 if (*p != BATADV_DHCP_HTYPE_ETHERNET)
716 return BATADV_DHCP_NO;
718 /* check if the DHCP packet carries a valid Ethernet address */
719 p = skb->data + *header_len + BATADV_DHCP_HLEN_OFFSET;
721 return BATADV_DHCP_NO;
723 memcpy(chaddr, skb->data + chaddr_offset, ETH_ALEN);
729 * batadv_gw_out_of_range - check if the dhcp request destination is the best gw
730 * @bat_priv: the bat priv with all the soft interface information
731 * @skb: the outgoing packet
733 * Check if the skb is a DHCP request and if it is sent to the current best GW
734 * server. Due to topology changes it may be the case that the GW server
735 * previously selected is not the best one anymore.
737 * Returns true if the packet destination is unicast and it is not the best gw,
740 * This call might reallocate skb data.
741 * Must be invoked only when the DHCP packet is going TO a DHCP SERVER.
743 bool batadv_gw_out_of_range(struct batadv_priv *bat_priv,
746 struct batadv_neigh_node *neigh_curr = NULL, *neigh_old = NULL;
747 struct batadv_orig_node *orig_dst_node = NULL;
748 struct batadv_gw_node *gw_node = NULL, *curr_gw = NULL;
749 struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
750 bool out_of_range = false;
754 vid = batadv_get_vid(skb, 0);
756 orig_dst_node = batadv_transtable_search(bat_priv, ethhdr->h_source,
757 ethhdr->h_dest, vid);
761 gw_node = batadv_gw_node_get(bat_priv, orig_dst_node);
762 if (!gw_node->bandwidth_down == 0)
765 switch (atomic_read(&bat_priv->gw_mode)) {
766 case BATADV_GW_MODE_SERVER:
767 /* If we are a GW then we are our best GW. We can artificially
768 * set the tq towards ourself as the maximum value
770 curr_tq_avg = BATADV_TQ_MAX_VALUE;
772 case BATADV_GW_MODE_CLIENT:
773 curr_gw = batadv_gw_get_selected_gw_node(bat_priv);
777 /* packet is going to our gateway */
778 if (curr_gw->orig_node == orig_dst_node)
781 /* If the dhcp packet has been sent to a different gw,
782 * we have to evaluate whether the old gw is still
785 neigh_curr = batadv_find_router(bat_priv, curr_gw->orig_node,
790 curr_tq_avg = neigh_curr->bat_iv.tq_avg;
792 case BATADV_GW_MODE_OFF:
797 neigh_old = batadv_find_router(bat_priv, orig_dst_node, NULL);
801 if (curr_tq_avg - neigh_old->bat_iv.tq_avg > BATADV_GW_THRESHOLD)
806 batadv_orig_node_free_ref(orig_dst_node);
808 batadv_gw_node_free_ref(curr_gw);
810 batadv_gw_node_free_ref(gw_node);
812 batadv_neigh_node_free_ref(neigh_old);
814 batadv_neigh_node_free_ref(neigh_curr);