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, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
22 #include "gateway_client.h"
23 #include "gateway_common.h"
24 #include "hard-interface.h"
25 #include "originator.h"
26 #include "translation-table.h"
29 #include <linux/ipv6.h>
30 #include <linux/udp.h>
31 #include <linux/if_vlan.h>
33 /* This is the offset of the options field in a dhcp packet starting at
34 * the beginning of the dhcp header
36 #define BATADV_DHCP_OPTIONS_OFFSET 240
37 #define BATADV_DHCP_REQUEST 3
39 static void batadv_gw_node_free_ref(struct batadv_gw_node
*gw_node
)
41 if (atomic_dec_and_test(&gw_node
->refcount
))
42 kfree_rcu(gw_node
, rcu
);
45 static struct batadv_gw_node
*
46 batadv_gw_get_selected_gw_node(struct batadv_priv
*bat_priv
)
48 struct batadv_gw_node
*gw_node
;
51 gw_node
= rcu_dereference(bat_priv
->gw
.curr_gw
);
55 if (!atomic_inc_not_zero(&gw_node
->refcount
))
63 struct batadv_orig_node
*
64 batadv_gw_get_selected_orig(struct batadv_priv
*bat_priv
)
66 struct batadv_gw_node
*gw_node
;
67 struct batadv_orig_node
*orig_node
= NULL
;
69 gw_node
= batadv_gw_get_selected_gw_node(bat_priv
);
74 orig_node
= gw_node
->orig_node
;
78 if (!atomic_inc_not_zero(&orig_node
->refcount
))
85 batadv_gw_node_free_ref(gw_node
);
89 static void batadv_gw_select(struct batadv_priv
*bat_priv
,
90 struct batadv_gw_node
*new_gw_node
)
92 struct batadv_gw_node
*curr_gw_node
;
94 spin_lock_bh(&bat_priv
->gw
.list_lock
);
96 if (new_gw_node
&& !atomic_inc_not_zero(&new_gw_node
->refcount
))
99 curr_gw_node
= rcu_dereference_protected(bat_priv
->gw
.curr_gw
, 1);
100 rcu_assign_pointer(bat_priv
->gw
.curr_gw
, new_gw_node
);
103 batadv_gw_node_free_ref(curr_gw_node
);
105 spin_unlock_bh(&bat_priv
->gw
.list_lock
);
108 void batadv_gw_deselect(struct batadv_priv
*bat_priv
)
110 atomic_set(&bat_priv
->gw
.reselect
, 1);
113 static struct batadv_gw_node
*
114 batadv_gw_get_best_gw_node(struct batadv_priv
*bat_priv
)
116 struct batadv_neigh_node
*router
;
117 struct batadv_gw_node
*gw_node
, *curr_gw
= NULL
;
118 uint32_t max_gw_factor
= 0, tmp_gw_factor
= 0;
122 struct batadv_orig_node
*orig_node
;
124 gw_divisor
= BATADV_TQ_LOCAL_WINDOW_SIZE
* BATADV_TQ_LOCAL_WINDOW_SIZE
;
128 hlist_for_each_entry_rcu(gw_node
, &bat_priv
->gw
.list
, list
) {
129 if (gw_node
->deleted
)
132 orig_node
= gw_node
->orig_node
;
133 router
= batadv_orig_node_get_router(orig_node
);
137 if (!atomic_inc_not_zero(&gw_node
->refcount
))
140 tq_avg
= router
->bat_iv
.tq_avg
;
142 switch (atomic_read(&bat_priv
->gw_sel_class
)) {
143 case 1: /* fast connection */
144 tmp_gw_factor
= tq_avg
* tq_avg
;
145 tmp_gw_factor
*= gw_node
->bandwidth_down
;
146 tmp_gw_factor
*= 100 * 100;
147 tmp_gw_factor
/= gw_divisor
;
149 if ((tmp_gw_factor
> max_gw_factor
) ||
150 ((tmp_gw_factor
== max_gw_factor
) &&
151 (tq_avg
> max_tq
))) {
153 batadv_gw_node_free_ref(curr_gw
);
155 atomic_inc(&curr_gw
->refcount
);
159 default: /* 2: stable connection (use best statistic)
160 * 3: fast-switch (use best statistic but change as
161 * soon as a better gateway appears)
162 * XX: late-switch (use best statistic but change as
163 * soon as a better gateway appears which has
164 * $routing_class more tq points)
166 if (tq_avg
> max_tq
) {
168 batadv_gw_node_free_ref(curr_gw
);
170 atomic_inc(&curr_gw
->refcount
);
178 if (tmp_gw_factor
> max_gw_factor
)
179 max_gw_factor
= tmp_gw_factor
;
181 batadv_gw_node_free_ref(gw_node
);
184 batadv_neigh_node_free_ref(router
);
192 * batadv_gw_check_client_stop - check if client mode has been switched off
193 * @bat_priv: the bat priv with all the soft interface information
195 * This function assumes the caller has checked that the gw state *is actually
196 * changing*. This function is not supposed to be called when there is no state
199 void batadv_gw_check_client_stop(struct batadv_priv
*bat_priv
)
201 struct batadv_gw_node
*curr_gw
;
203 if (atomic_read(&bat_priv
->gw_mode
) != BATADV_GW_MODE_CLIENT
)
206 curr_gw
= batadv_gw_get_selected_gw_node(bat_priv
);
210 /* if batman-adv is switching the gw client mode off and a gateway was
211 * already selected, send a DEL uevent
213 batadv_throw_uevent(bat_priv
, BATADV_UEV_GW
, BATADV_UEV_DEL
, NULL
);
215 batadv_gw_node_free_ref(curr_gw
);
218 void batadv_gw_election(struct batadv_priv
*bat_priv
)
220 struct batadv_gw_node
*curr_gw
= NULL
, *next_gw
= NULL
;
221 struct batadv_neigh_node
*router
= NULL
;
222 char gw_addr
[18] = { '\0' };
224 if (atomic_read(&bat_priv
->gw_mode
) != BATADV_GW_MODE_CLIENT
)
227 curr_gw
= batadv_gw_get_selected_gw_node(bat_priv
);
229 if (!batadv_atomic_dec_not_zero(&bat_priv
->gw
.reselect
) && curr_gw
)
232 next_gw
= batadv_gw_get_best_gw_node(bat_priv
);
234 if (curr_gw
== next_gw
)
238 sprintf(gw_addr
, "%pM", next_gw
->orig_node
->orig
);
240 router
= batadv_orig_node_get_router(next_gw
->orig_node
);
242 batadv_gw_deselect(bat_priv
);
247 if ((curr_gw
) && (!next_gw
)) {
248 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
249 "Removing selected gateway - no gateway in range\n");
250 batadv_throw_uevent(bat_priv
, BATADV_UEV_GW
, BATADV_UEV_DEL
,
252 } else if ((!curr_gw
) && (next_gw
)) {
253 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
254 "Adding route to gateway %pM (bandwidth: %u.%u/%u.%u MBit, tq: %i)\n",
255 next_gw
->orig_node
->orig
,
256 next_gw
->bandwidth_down
/ 10,
257 next_gw
->bandwidth_down
% 10,
258 next_gw
->bandwidth_up
/ 10,
259 next_gw
->bandwidth_up
% 10, router
->bat_iv
.tq_avg
);
260 batadv_throw_uevent(bat_priv
, BATADV_UEV_GW
, BATADV_UEV_ADD
,
263 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
264 "Changing route to gateway %pM (bandwidth: %u.%u/%u.%u MBit, tq: %i)\n",
265 next_gw
->orig_node
->orig
,
266 next_gw
->bandwidth_down
/ 10,
267 next_gw
->bandwidth_down
% 10,
268 next_gw
->bandwidth_up
/ 10,
269 next_gw
->bandwidth_up
% 10, router
->bat_iv
.tq_avg
);
270 batadv_throw_uevent(bat_priv
, BATADV_UEV_GW
, BATADV_UEV_CHANGE
,
274 batadv_gw_select(bat_priv
, next_gw
);
278 batadv_gw_node_free_ref(curr_gw
);
280 batadv_gw_node_free_ref(next_gw
);
282 batadv_neigh_node_free_ref(router
);
285 void batadv_gw_check_election(struct batadv_priv
*bat_priv
,
286 struct batadv_orig_node
*orig_node
)
288 struct batadv_orig_node
*curr_gw_orig
;
289 struct batadv_neigh_node
*router_gw
= NULL
, *router_orig
= NULL
;
290 uint8_t gw_tq_avg
, orig_tq_avg
;
292 curr_gw_orig
= batadv_gw_get_selected_orig(bat_priv
);
296 router_gw
= batadv_orig_node_get_router(curr_gw_orig
);
300 /* this node already is the gateway */
301 if (curr_gw_orig
== orig_node
)
304 router_orig
= batadv_orig_node_get_router(orig_node
);
308 gw_tq_avg
= router_gw
->bat_iv
.tq_avg
;
309 orig_tq_avg
= router_orig
->bat_iv
.tq_avg
;
311 /* the TQ value has to be better */
312 if (orig_tq_avg
< gw_tq_avg
)
315 /* if the routing class is greater than 3 the value tells us how much
316 * greater the TQ value of the new gateway must be
318 if ((atomic_read(&bat_priv
->gw_sel_class
) > 3) &&
319 (orig_tq_avg
- gw_tq_avg
< atomic_read(&bat_priv
->gw_sel_class
)))
322 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
323 "Restarting gateway selection: better gateway found (tq curr: %i, tq new: %i)\n",
324 gw_tq_avg
, orig_tq_avg
);
327 batadv_gw_deselect(bat_priv
);
330 batadv_orig_node_free_ref(curr_gw_orig
);
332 batadv_neigh_node_free_ref(router_gw
);
334 batadv_neigh_node_free_ref(router_orig
);
340 * batadv_gw_node_add - add gateway node to list of available gateways
341 * @bat_priv: the bat priv with all the soft interface information
342 * @orig_node: originator announcing gateway capabilities
343 * @gateway: announced bandwidth information
345 static void batadv_gw_node_add(struct batadv_priv
*bat_priv
,
346 struct batadv_orig_node
*orig_node
,
347 struct batadv_tvlv_gateway_data
*gateway
)
349 struct batadv_gw_node
*gw_node
;
351 if (gateway
->bandwidth_down
== 0)
354 gw_node
= kzalloc(sizeof(*gw_node
), GFP_ATOMIC
);
358 INIT_HLIST_NODE(&gw_node
->list
);
359 gw_node
->orig_node
= orig_node
;
360 atomic_set(&gw_node
->refcount
, 1);
362 spin_lock_bh(&bat_priv
->gw
.list_lock
);
363 hlist_add_head_rcu(&gw_node
->list
, &bat_priv
->gw
.list
);
364 spin_unlock_bh(&bat_priv
->gw
.list_lock
);
366 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
367 "Found new gateway %pM -> gw bandwidth: %u.%u/%u.%u MBit\n",
369 ntohl(gateway
->bandwidth_down
) / 10,
370 ntohl(gateway
->bandwidth_down
) % 10,
371 ntohl(gateway
->bandwidth_up
) / 10,
372 ntohl(gateway
->bandwidth_up
) % 10);
376 * batadv_gw_node_get - retrieve gateway node from list of available gateways
377 * @bat_priv: the bat priv with all the soft interface information
378 * @orig_node: originator announcing gateway capabilities
380 * Returns gateway node if found or NULL otherwise.
382 static struct batadv_gw_node
*
383 batadv_gw_node_get(struct batadv_priv
*bat_priv
,
384 struct batadv_orig_node
*orig_node
)
386 struct batadv_gw_node
*gw_node_tmp
, *gw_node
= NULL
;
389 hlist_for_each_entry_rcu(gw_node_tmp
, &bat_priv
->gw
.list
, list
) {
390 if (gw_node_tmp
->orig_node
!= orig_node
)
393 if (gw_node_tmp
->deleted
)
396 if (!atomic_inc_not_zero(&gw_node_tmp
->refcount
))
399 gw_node
= gw_node_tmp
;
408 * batadv_gw_node_update - update list of available gateways with changed
409 * bandwidth information
410 * @bat_priv: the bat priv with all the soft interface information
411 * @orig_node: originator announcing gateway capabilities
412 * @gateway: announced bandwidth information
414 void batadv_gw_node_update(struct batadv_priv
*bat_priv
,
415 struct batadv_orig_node
*orig_node
,
416 struct batadv_tvlv_gateway_data
*gateway
)
418 struct batadv_gw_node
*gw_node
, *curr_gw
= NULL
;
420 gw_node
= batadv_gw_node_get(bat_priv
, orig_node
);
422 batadv_gw_node_add(bat_priv
, orig_node
, gateway
);
426 if ((gw_node
->bandwidth_down
== ntohl(gateway
->bandwidth_down
)) &&
427 (gw_node
->bandwidth_up
== ntohl(gateway
->bandwidth_up
)))
430 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
431 "Gateway bandwidth of originator %pM changed from %u.%u/%u.%u MBit to %u.%u/%u.%u MBit\n",
433 gw_node
->bandwidth_down
/ 10,
434 gw_node
->bandwidth_down
% 10,
435 gw_node
->bandwidth_up
/ 10,
436 gw_node
->bandwidth_up
% 10,
437 ntohl(gateway
->bandwidth_down
) / 10,
438 ntohl(gateway
->bandwidth_down
) % 10,
439 ntohl(gateway
->bandwidth_up
) / 10,
440 ntohl(gateway
->bandwidth_up
) % 10);
442 gw_node
->bandwidth_down
= ntohl(gateway
->bandwidth_down
);
443 gw_node
->bandwidth_up
= ntohl(gateway
->bandwidth_up
);
445 gw_node
->deleted
= 0;
446 if (ntohl(gateway
->bandwidth_down
) == 0) {
447 gw_node
->deleted
= jiffies
;
448 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
449 "Gateway %pM removed from gateway list\n",
452 /* Note: We don't need a NULL check here, since curr_gw never
455 curr_gw
= batadv_gw_get_selected_gw_node(bat_priv
);
456 if (gw_node
== curr_gw
)
457 batadv_gw_deselect(bat_priv
);
462 batadv_gw_node_free_ref(curr_gw
);
464 batadv_gw_node_free_ref(gw_node
);
467 void batadv_gw_node_delete(struct batadv_priv
*bat_priv
,
468 struct batadv_orig_node
*orig_node
)
470 struct batadv_tvlv_gateway_data gateway
;
472 gateway
.bandwidth_down
= 0;
473 gateway
.bandwidth_up
= 0;
475 batadv_gw_node_update(bat_priv
, orig_node
, &gateway
);
478 void batadv_gw_node_purge(struct batadv_priv
*bat_priv
)
480 struct batadv_gw_node
*gw_node
, *curr_gw
;
481 struct hlist_node
*node_tmp
;
482 unsigned long timeout
= msecs_to_jiffies(2 * BATADV_PURGE_TIMEOUT
);
485 curr_gw
= batadv_gw_get_selected_gw_node(bat_priv
);
487 spin_lock_bh(&bat_priv
->gw
.list_lock
);
489 hlist_for_each_entry_safe(gw_node
, node_tmp
,
490 &bat_priv
->gw
.list
, list
) {
491 if (((!gw_node
->deleted
) ||
492 (time_before(jiffies
, gw_node
->deleted
+ timeout
))) &&
493 atomic_read(&bat_priv
->mesh_state
) == BATADV_MESH_ACTIVE
)
496 if (curr_gw
== gw_node
)
499 hlist_del_rcu(&gw_node
->list
);
500 batadv_gw_node_free_ref(gw_node
);
503 spin_unlock_bh(&bat_priv
->gw
.list_lock
);
505 /* gw_deselect() needs to acquire the gw_list_lock */
507 batadv_gw_deselect(bat_priv
);
510 batadv_gw_node_free_ref(curr_gw
);
513 /* fails if orig_node has no router */
514 static int batadv_write_buffer_text(struct batadv_priv
*bat_priv
,
515 struct seq_file
*seq
,
516 const struct batadv_gw_node
*gw_node
)
518 struct batadv_gw_node
*curr_gw
;
519 struct batadv_neigh_node
*router
;
522 router
= batadv_orig_node_get_router(gw_node
->orig_node
);
526 curr_gw
= batadv_gw_get_selected_gw_node(bat_priv
);
528 ret
= seq_printf(seq
, "%s %pM (%3i) %pM [%10s]: %u.%u/%u.%u MBit\n",
529 (curr_gw
== gw_node
? "=>" : " "),
530 gw_node
->orig_node
->orig
,
531 router
->bat_iv
.tq_avg
, router
->addr
,
532 router
->if_incoming
->net_dev
->name
,
533 gw_node
->bandwidth_down
/ 10,
534 gw_node
->bandwidth_down
% 10,
535 gw_node
->bandwidth_up
/ 10,
536 gw_node
->bandwidth_up
% 10);
538 batadv_neigh_node_free_ref(router
);
540 batadv_gw_node_free_ref(curr_gw
);
545 int batadv_gw_client_seq_print_text(struct seq_file
*seq
, void *offset
)
547 struct net_device
*net_dev
= (struct net_device
*)seq
->private;
548 struct batadv_priv
*bat_priv
= netdev_priv(net_dev
);
549 struct batadv_hard_iface
*primary_if
;
550 struct batadv_gw_node
*gw_node
;
553 primary_if
= batadv_seq_print_text_primary_if_get(seq
);
558 " %-12s (%s/%i) %17s [%10s]: advertised uplink bandwidth ... [B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s)]\n",
559 "Gateway", "#", BATADV_TQ_MAX_VALUE
, "Nexthop", "outgoingIF",
560 BATADV_SOURCE_VERSION
, primary_if
->net_dev
->name
,
561 primary_if
->net_dev
->dev_addr
, net_dev
->name
);
564 hlist_for_each_entry_rcu(gw_node
, &bat_priv
->gw
.list
, list
) {
565 if (gw_node
->deleted
)
568 /* fails if orig_node has no router */
569 if (batadv_write_buffer_text(bat_priv
, seq
, gw_node
) < 0)
577 seq_puts(seq
, "No gateways in range ...\n");
581 batadv_hardif_free_ref(primary_if
);
585 /* this call might reallocate skb data */
586 static bool batadv_is_type_dhcprequest(struct sk_buff
*skb
, int header_len
)
592 if (skb_linearize(skb
) < 0)
595 pkt_len
= skb_headlen(skb
);
597 if (pkt_len
< header_len
+ BATADV_DHCP_OPTIONS_OFFSET
+ 1)
600 p
= skb
->data
+ header_len
+ BATADV_DHCP_OPTIONS_OFFSET
;
601 pkt_len
-= header_len
+ BATADV_DHCP_OPTIONS_OFFSET
+ 1;
603 /* Access the dhcp option lists. Each entry is made up by:
604 * - octet 1: option type
605 * - octet 2: option data len (only if type != 255 and 0)
606 * - octet 3: option data
608 while (*p
!= 255 && !ret
) {
609 /* p now points to the first octet: option type */
611 /* type 53 is the message type option.
612 * Jump the len octet and go to the data octet
618 /* check if the message type is what we need */
619 if (*p
== BATADV_DHCP_REQUEST
)
622 } else if (*p
== 0) {
623 /* option type 0 (padding), just go forward */
629 /* This is any other option. So we get the length... */
635 /* ...and then we jump over the data */
636 if (pkt_len
< 1 + (*p
))
646 /* this call might reallocate skb data */
647 bool batadv_gw_is_dhcp_target(struct sk_buff
*skb
, unsigned int *header_len
)
649 struct ethhdr
*ethhdr
;
651 struct ipv6hdr
*ipv6hdr
;
652 struct udphdr
*udphdr
;
653 struct vlan_ethhdr
*vhdr
;
656 /* check for ethernet header */
657 if (!pskb_may_pull(skb
, *header_len
+ ETH_HLEN
))
659 ethhdr
= (struct ethhdr
*)skb
->data
;
660 proto
= ethhdr
->h_proto
;
661 *header_len
+= ETH_HLEN
;
663 /* check for initial vlan header */
664 if (proto
== htons(ETH_P_8021Q
)) {
665 if (!pskb_may_pull(skb
, *header_len
+ VLAN_HLEN
))
668 vhdr
= (struct vlan_ethhdr
*)skb
->data
;
669 proto
= vhdr
->h_vlan_encapsulated_proto
;
670 *header_len
+= VLAN_HLEN
;
673 /* check for ip header */
675 case htons(ETH_P_IP
):
676 if (!pskb_may_pull(skb
, *header_len
+ sizeof(*iphdr
)))
678 iphdr
= (struct iphdr
*)(skb
->data
+ *header_len
);
679 *header_len
+= iphdr
->ihl
* 4;
681 /* check for udp header */
682 if (iphdr
->protocol
!= IPPROTO_UDP
)
686 case htons(ETH_P_IPV6
):
687 if (!pskb_may_pull(skb
, *header_len
+ sizeof(*ipv6hdr
)))
689 ipv6hdr
= (struct ipv6hdr
*)(skb
->data
+ *header_len
);
690 *header_len
+= sizeof(*ipv6hdr
);
692 /* check for udp header */
693 if (ipv6hdr
->nexthdr
!= IPPROTO_UDP
)
701 if (!pskb_may_pull(skb
, *header_len
+ sizeof(*udphdr
)))
704 /* skb->data might have been reallocated by pskb_may_pull() */
705 ethhdr
= (struct ethhdr
*)skb
->data
;
706 if (ntohs(ethhdr
->h_proto
) == ETH_P_8021Q
)
707 ethhdr
= (struct ethhdr
*)(skb
->data
+ VLAN_HLEN
);
709 udphdr
= (struct udphdr
*)(skb
->data
+ *header_len
);
710 *header_len
+= sizeof(*udphdr
);
712 /* check for bootp port */
713 if ((proto
== htons(ETH_P_IP
)) &&
714 (udphdr
->dest
!= htons(67)))
717 if ((proto
== htons(ETH_P_IPV6
)) &&
718 (udphdr
->dest
!= htons(547)))
725 * batadv_gw_out_of_range - check if the dhcp request destination is the best gw
726 * @bat_priv: the bat priv with all the soft interface information
727 * @skb: the outgoing packet
729 * Check if the skb is a DHCP request and if it is sent to the current best GW
730 * server. Due to topology changes it may be the case that the GW server
731 * previously selected is not the best one anymore.
733 * Returns true if the packet destination is unicast and it is not the best gw,
736 * This call might reallocate skb data.
738 bool batadv_gw_out_of_range(struct batadv_priv
*bat_priv
,
741 struct batadv_neigh_node
*neigh_curr
= NULL
, *neigh_old
= NULL
;
742 struct batadv_orig_node
*orig_dst_node
= NULL
;
743 struct batadv_gw_node
*gw_node
= NULL
, *curr_gw
= NULL
;
744 struct ethhdr
*ethhdr
;
745 bool ret
, out_of_range
= false;
746 unsigned int header_len
= 0;
750 vid
= batadv_get_vid(skb
, 0);
752 ret
= batadv_gw_is_dhcp_target(skb
, &header_len
);
756 ethhdr
= (struct ethhdr
*)skb
->data
;
757 orig_dst_node
= batadv_transtable_search(bat_priv
, ethhdr
->h_source
,
758 ethhdr
->h_dest
, vid
);
762 gw_node
= batadv_gw_node_get(bat_priv
, orig_dst_node
);
763 if (!gw_node
->bandwidth_down
== 0)
766 ret
= batadv_is_type_dhcprequest(skb
, header_len
);
770 switch (atomic_read(&bat_priv
->gw_mode
)) {
771 case BATADV_GW_MODE_SERVER
:
772 /* If we are a GW then we are our best GW. We can artificially
773 * set the tq towards ourself as the maximum value
775 curr_tq_avg
= BATADV_TQ_MAX_VALUE
;
777 case BATADV_GW_MODE_CLIENT
:
778 curr_gw
= batadv_gw_get_selected_gw_node(bat_priv
);
782 /* packet is going to our gateway */
783 if (curr_gw
->orig_node
== orig_dst_node
)
786 /* If the dhcp packet has been sent to a different gw,
787 * we have to evaluate whether the old gw is still
790 neigh_curr
= batadv_find_router(bat_priv
, curr_gw
->orig_node
,
795 curr_tq_avg
= neigh_curr
->bat_iv
.tq_avg
;
797 case BATADV_GW_MODE_OFF
:
802 neigh_old
= batadv_find_router(bat_priv
, orig_dst_node
, NULL
);
806 if (curr_tq_avg
- neigh_old
->bat_iv
.tq_avg
> BATADV_GW_THRESHOLD
)
811 batadv_orig_node_free_ref(orig_dst_node
);
813 batadv_gw_node_free_ref(curr_gw
);
815 batadv_gw_node_free_ref(gw_node
);
817 batadv_neigh_node_free_ref(neigh_old
);
819 batadv_neigh_node_free_ref(neigh_curr
);