1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (C) 2009-2018 B.A.T.M.A.N. contributors:
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.
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.
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/>.
19 #include "gateway_client.h"
22 #include <linux/atomic.h>
23 #include <linux/byteorder/generic.h>
24 #include <linux/errno.h>
25 #include <linux/etherdevice.h>
26 #include <linux/gfp.h>
27 #include <linux/if_ether.h>
28 #include <linux/if_vlan.h>
31 #include <linux/ipv6.h>
32 #include <linux/kernel.h>
33 #include <linux/kref.h>
34 #include <linux/list.h>
35 #include <linux/lockdep.h>
36 #include <linux/netdevice.h>
37 #include <linux/netlink.h>
38 #include <linux/rculist.h>
39 #include <linux/rcupdate.h>
40 #include <linux/seq_file.h>
41 #include <linux/skbuff.h>
42 #include <linux/slab.h>
43 #include <linux/spinlock.h>
44 #include <linux/stddef.h>
45 #include <linux/udp.h>
47 #include <uapi/linux/batadv_packet.h>
48 #include <uapi/linux/batman_adv.h>
50 #include "gateway_common.h"
51 #include "hard-interface.h"
54 #include "originator.h"
56 #include "soft-interface.h"
58 #include "translation-table.h"
60 /* These are the offsets of the "hw type" and "hw address length" in the dhcp
61 * packet starting at the beginning of the dhcp header
63 #define BATADV_DHCP_HTYPE_OFFSET 1
64 #define BATADV_DHCP_HLEN_OFFSET 2
65 /* Value of htype representing Ethernet */
66 #define BATADV_DHCP_HTYPE_ETHERNET 0x01
67 /* This is the offset of the "chaddr" field in the dhcp packet starting at the
68 * beginning of the dhcp header
70 #define BATADV_DHCP_CHADDR_OFFSET 28
73 * batadv_gw_node_release() - release gw_node from lists and queue for free
74 * after rcu grace period
75 * @ref: kref pointer of the gw_node
77 static void batadv_gw_node_release(struct kref *ref)
79 struct batadv_gw_node *gw_node;
81 gw_node = container_of(ref, struct batadv_gw_node, refcount);
83 batadv_orig_node_put(gw_node->orig_node);
84 kfree_rcu(gw_node, rcu);
88 * batadv_gw_node_put() - decrement the gw_node refcounter and possibly release
90 * @gw_node: gateway node to free
92 void batadv_gw_node_put(struct batadv_gw_node *gw_node)
94 kref_put(&gw_node->refcount, batadv_gw_node_release);
98 * batadv_gw_get_selected_gw_node() - Get currently selected gateway
99 * @bat_priv: the bat priv with all the soft interface information
101 * Return: selected gateway (with increased refcnt), NULL on errors
103 struct batadv_gw_node *
104 batadv_gw_get_selected_gw_node(struct batadv_priv *bat_priv)
106 struct batadv_gw_node *gw_node;
109 gw_node = rcu_dereference(bat_priv->gw.curr_gw);
113 if (!kref_get_unless_zero(&gw_node->refcount))
122 * batadv_gw_get_selected_orig() - Get originator of currently selected gateway
123 * @bat_priv: the bat priv with all the soft interface information
125 * Return: orig_node of selected gateway (with increased refcnt), NULL on errors
127 struct batadv_orig_node *
128 batadv_gw_get_selected_orig(struct batadv_priv *bat_priv)
130 struct batadv_gw_node *gw_node;
131 struct batadv_orig_node *orig_node = NULL;
133 gw_node = batadv_gw_get_selected_gw_node(bat_priv);
138 orig_node = gw_node->orig_node;
142 if (!kref_get_unless_zero(&orig_node->refcount))
149 batadv_gw_node_put(gw_node);
153 static void batadv_gw_select(struct batadv_priv *bat_priv,
154 struct batadv_gw_node *new_gw_node)
156 struct batadv_gw_node *curr_gw_node;
158 spin_lock_bh(&bat_priv->gw.list_lock);
161 kref_get(&new_gw_node->refcount);
163 curr_gw_node = rcu_dereference_protected(bat_priv->gw.curr_gw, 1);
164 rcu_assign_pointer(bat_priv->gw.curr_gw, new_gw_node);
167 batadv_gw_node_put(curr_gw_node);
169 spin_unlock_bh(&bat_priv->gw.list_lock);
173 * batadv_gw_reselect() - force a gateway reselection
174 * @bat_priv: the bat priv with all the soft interface information
176 * Set a flag to remind the GW component to perform a new gateway reselection.
177 * However this function does not ensure that the current gateway is going to be
178 * deselected. The reselection mechanism may elect the same gateway once again.
180 * This means that invoking batadv_gw_reselect() does not guarantee a gateway
181 * change and therefore a uevent is not necessarily expected.
183 void batadv_gw_reselect(struct batadv_priv *bat_priv)
185 atomic_set(&bat_priv->gw.reselect, 1);
189 * batadv_gw_check_client_stop() - check if client mode has been switched off
190 * @bat_priv: the bat priv with all the soft interface information
192 * This function assumes the caller has checked that the gw state *is actually
193 * changing*. This function is not supposed to be called when there is no state
196 void batadv_gw_check_client_stop(struct batadv_priv *bat_priv)
198 struct batadv_gw_node *curr_gw;
200 if (atomic_read(&bat_priv->gw.mode) != BATADV_GW_MODE_CLIENT)
203 curr_gw = batadv_gw_get_selected_gw_node(bat_priv);
207 /* deselect the current gateway so that next time that client mode is
208 * enabled a proper GW_ADD event can be sent
210 batadv_gw_select(bat_priv, NULL);
212 /* if batman-adv is switching the gw client mode off and a gateway was
213 * already selected, send a DEL uevent
215 batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL, NULL);
217 batadv_gw_node_put(curr_gw);
221 * batadv_gw_election() - Elect the best gateway
222 * @bat_priv: the bat priv with all the soft interface information
224 void batadv_gw_election(struct batadv_priv *bat_priv)
226 struct batadv_gw_node *curr_gw = NULL;
227 struct batadv_gw_node *next_gw = NULL;
228 struct batadv_neigh_node *router = NULL;
229 struct batadv_neigh_ifinfo *router_ifinfo = NULL;
230 char gw_addr[18] = { '\0' };
232 if (atomic_read(&bat_priv->gw.mode) != BATADV_GW_MODE_CLIENT)
235 if (!bat_priv->algo_ops->gw.get_best_gw_node)
238 curr_gw = batadv_gw_get_selected_gw_node(bat_priv);
240 if (!batadv_atomic_dec_not_zero(&bat_priv->gw.reselect) && curr_gw)
243 /* if gw.reselect is set to 1 it means that a previous call to
244 * gw.is_eligible() said that we have a new best GW, therefore it can
245 * now be picked from the list and selected
247 next_gw = bat_priv->algo_ops->gw.get_best_gw_node(bat_priv);
249 if (curr_gw == next_gw)
253 sprintf(gw_addr, "%pM", next_gw->orig_node->orig);
255 router = batadv_orig_router_get(next_gw->orig_node,
258 batadv_gw_reselect(bat_priv);
262 router_ifinfo = batadv_neigh_ifinfo_get(router,
264 if (!router_ifinfo) {
265 batadv_gw_reselect(bat_priv);
270 if (curr_gw && !next_gw) {
271 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
272 "Removing selected gateway - no gateway in range\n");
273 batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL,
275 } else if (!curr_gw && next_gw) {
276 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
277 "Adding route to gateway %pM (bandwidth: %u.%u/%u.%u MBit, tq: %i)\n",
278 next_gw->orig_node->orig,
279 next_gw->bandwidth_down / 10,
280 next_gw->bandwidth_down % 10,
281 next_gw->bandwidth_up / 10,
282 next_gw->bandwidth_up % 10,
283 router_ifinfo->bat_iv.tq_avg);
284 batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_ADD,
287 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
288 "Changing route to gateway %pM (bandwidth: %u.%u/%u.%u MBit, tq: %i)\n",
289 next_gw->orig_node->orig,
290 next_gw->bandwidth_down / 10,
291 next_gw->bandwidth_down % 10,
292 next_gw->bandwidth_up / 10,
293 next_gw->bandwidth_up % 10,
294 router_ifinfo->bat_iv.tq_avg);
295 batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_CHANGE,
299 batadv_gw_select(bat_priv, next_gw);
303 batadv_gw_node_put(curr_gw);
305 batadv_gw_node_put(next_gw);
307 batadv_neigh_node_put(router);
309 batadv_neigh_ifinfo_put(router_ifinfo);
313 * batadv_gw_check_election() - Elect orig node as best gateway when eligible
314 * @bat_priv: the bat priv with all the soft interface information
315 * @orig_node: orig node which is to be checked
317 void batadv_gw_check_election(struct batadv_priv *bat_priv,
318 struct batadv_orig_node *orig_node)
320 struct batadv_orig_node *curr_gw_orig;
322 /* abort immediately if the routing algorithm does not support gateway
325 if (!bat_priv->algo_ops->gw.is_eligible)
328 curr_gw_orig = batadv_gw_get_selected_orig(bat_priv);
332 /* this node already is the gateway */
333 if (curr_gw_orig == orig_node)
336 if (!bat_priv->algo_ops->gw.is_eligible(bat_priv, curr_gw_orig,
341 batadv_gw_reselect(bat_priv);
344 batadv_orig_node_put(curr_gw_orig);
348 * batadv_gw_node_add() - add gateway node to list of available gateways
349 * @bat_priv: the bat priv with all the soft interface information
350 * @orig_node: originator announcing gateway capabilities
351 * @gateway: announced bandwidth information
353 * Has to be called with the appropriate locks being acquired
356 static void batadv_gw_node_add(struct batadv_priv *bat_priv,
357 struct batadv_orig_node *orig_node,
358 struct batadv_tvlv_gateway_data *gateway)
360 struct batadv_gw_node *gw_node;
362 lockdep_assert_held(&bat_priv->gw.list_lock);
364 if (gateway->bandwidth_down == 0)
367 gw_node = kzalloc(sizeof(*gw_node), GFP_ATOMIC);
371 kref_init(&gw_node->refcount);
372 INIT_HLIST_NODE(&gw_node->list);
373 kref_get(&orig_node->refcount);
374 gw_node->orig_node = orig_node;
375 gw_node->bandwidth_down = ntohl(gateway->bandwidth_down);
376 gw_node->bandwidth_up = ntohl(gateway->bandwidth_up);
378 kref_get(&gw_node->refcount);
379 hlist_add_head_rcu(&gw_node->list, &bat_priv->gw.gateway_list);
380 bat_priv->gw.generation++;
382 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
383 "Found new gateway %pM -> gw bandwidth: %u.%u/%u.%u MBit\n",
385 ntohl(gateway->bandwidth_down) / 10,
386 ntohl(gateway->bandwidth_down) % 10,
387 ntohl(gateway->bandwidth_up) / 10,
388 ntohl(gateway->bandwidth_up) % 10);
390 /* don't return reference to new gw_node */
391 batadv_gw_node_put(gw_node);
395 * batadv_gw_node_get() - retrieve gateway node from list of available gateways
396 * @bat_priv: the bat priv with all the soft interface information
397 * @orig_node: originator announcing gateway capabilities
399 * Return: gateway node if found or NULL otherwise.
401 struct batadv_gw_node *batadv_gw_node_get(struct batadv_priv *bat_priv,
402 struct batadv_orig_node *orig_node)
404 struct batadv_gw_node *gw_node_tmp, *gw_node = NULL;
407 hlist_for_each_entry_rcu(gw_node_tmp, &bat_priv->gw.gateway_list,
409 if (gw_node_tmp->orig_node != orig_node)
412 if (!kref_get_unless_zero(&gw_node_tmp->refcount))
415 gw_node = gw_node_tmp;
424 * batadv_gw_node_update() - update list of available gateways with changed
425 * bandwidth information
426 * @bat_priv: the bat priv with all the soft interface information
427 * @orig_node: originator announcing gateway capabilities
428 * @gateway: announced bandwidth information
430 void batadv_gw_node_update(struct batadv_priv *bat_priv,
431 struct batadv_orig_node *orig_node,
432 struct batadv_tvlv_gateway_data *gateway)
434 struct batadv_gw_node *gw_node, *curr_gw = NULL;
436 spin_lock_bh(&bat_priv->gw.list_lock);
437 gw_node = batadv_gw_node_get(bat_priv, orig_node);
439 batadv_gw_node_add(bat_priv, orig_node, gateway);
440 spin_unlock_bh(&bat_priv->gw.list_lock);
443 spin_unlock_bh(&bat_priv->gw.list_lock);
445 if (gw_node->bandwidth_down == ntohl(gateway->bandwidth_down) &&
446 gw_node->bandwidth_up == ntohl(gateway->bandwidth_up))
449 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
450 "Gateway bandwidth of originator %pM changed from %u.%u/%u.%u MBit to %u.%u/%u.%u MBit\n",
452 gw_node->bandwidth_down / 10,
453 gw_node->bandwidth_down % 10,
454 gw_node->bandwidth_up / 10,
455 gw_node->bandwidth_up % 10,
456 ntohl(gateway->bandwidth_down) / 10,
457 ntohl(gateway->bandwidth_down) % 10,
458 ntohl(gateway->bandwidth_up) / 10,
459 ntohl(gateway->bandwidth_up) % 10);
461 gw_node->bandwidth_down = ntohl(gateway->bandwidth_down);
462 gw_node->bandwidth_up = ntohl(gateway->bandwidth_up);
464 if (ntohl(gateway->bandwidth_down) == 0) {
465 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
466 "Gateway %pM removed from gateway list\n",
469 /* Note: We don't need a NULL check here, since curr_gw never
472 spin_lock_bh(&bat_priv->gw.list_lock);
473 if (!hlist_unhashed(&gw_node->list)) {
474 hlist_del_init_rcu(&gw_node->list);
475 batadv_gw_node_put(gw_node);
476 bat_priv->gw.generation++;
478 spin_unlock_bh(&bat_priv->gw.list_lock);
480 curr_gw = batadv_gw_get_selected_gw_node(bat_priv);
481 if (gw_node == curr_gw)
482 batadv_gw_reselect(bat_priv);
485 batadv_gw_node_put(curr_gw);
490 batadv_gw_node_put(gw_node);
494 * batadv_gw_node_delete() - Remove orig_node from gateway list
495 * @bat_priv: the bat priv with all the soft interface information
496 * @orig_node: orig node which is currently in process of being removed
498 void batadv_gw_node_delete(struct batadv_priv *bat_priv,
499 struct batadv_orig_node *orig_node)
501 struct batadv_tvlv_gateway_data gateway;
503 gateway.bandwidth_down = 0;
504 gateway.bandwidth_up = 0;
506 batadv_gw_node_update(bat_priv, orig_node, &gateway);
510 * batadv_gw_node_free() - Free gateway information from soft interface
511 * @bat_priv: the bat priv with all the soft interface information
513 void batadv_gw_node_free(struct batadv_priv *bat_priv)
515 struct batadv_gw_node *gw_node;
516 struct hlist_node *node_tmp;
518 spin_lock_bh(&bat_priv->gw.list_lock);
519 hlist_for_each_entry_safe(gw_node, node_tmp,
520 &bat_priv->gw.gateway_list, list) {
521 hlist_del_init_rcu(&gw_node->list);
522 batadv_gw_node_put(gw_node);
523 bat_priv->gw.generation++;
525 spin_unlock_bh(&bat_priv->gw.list_lock);
528 #ifdef CONFIG_BATMAN_ADV_DEBUGFS
531 * batadv_gw_client_seq_print_text() - Print the gateway table in a seq file
532 * @seq: seq file to print on
537 int batadv_gw_client_seq_print_text(struct seq_file *seq, void *offset)
539 struct net_device *net_dev = (struct net_device *)seq->private;
540 struct batadv_priv *bat_priv = netdev_priv(net_dev);
541 struct batadv_hard_iface *primary_if;
543 primary_if = batadv_seq_print_text_primary_if_get(seq);
547 seq_printf(seq, "[B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s %s)]\n",
548 BATADV_SOURCE_VERSION, primary_if->net_dev->name,
549 primary_if->net_dev->dev_addr, net_dev->name,
550 bat_priv->algo_ops->name);
552 batadv_hardif_put(primary_if);
554 if (!bat_priv->algo_ops->gw.print) {
556 "No printing function for this routing protocol\n");
560 bat_priv->algo_ops->gw.print(bat_priv, seq);
567 * batadv_gw_dump() - Dump gateways into a message
568 * @msg: Netlink message to dump into
569 * @cb: Control block containing additional options
571 * Return: Error code, or length of message
573 int batadv_gw_dump(struct sk_buff *msg, struct netlink_callback *cb)
575 struct batadv_hard_iface *primary_if = NULL;
576 struct net *net = sock_net(cb->skb->sk);
577 struct net_device *soft_iface;
578 struct batadv_priv *bat_priv;
582 ifindex = batadv_netlink_get_ifindex(cb->nlh,
583 BATADV_ATTR_MESH_IFINDEX);
587 soft_iface = dev_get_by_index(net, ifindex);
588 if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
593 bat_priv = netdev_priv(soft_iface);
595 primary_if = batadv_primary_if_get_selected(bat_priv);
596 if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) {
601 if (!bat_priv->algo_ops->gw.dump) {
606 bat_priv->algo_ops->gw.dump(msg, cb, bat_priv);
612 batadv_hardif_put(primary_if);
620 * batadv_gw_dhcp_recipient_get() - check if a packet is a DHCP message
621 * @skb: the packet to check
622 * @header_len: a pointer to the batman-adv header size
623 * @chaddr: buffer where the client address will be stored. Valid
624 * only if the function returns BATADV_DHCP_TO_CLIENT
626 * This function may re-allocate the data buffer of the skb passed as argument.
629 * - BATADV_DHCP_NO if the packet is not a dhcp message or if there was an error
631 * - BATADV_DHCP_TO_SERVER if this is a message going to the DHCP server
632 * - BATADV_DHCP_TO_CLIENT if this is a message going to a DHCP client
634 enum batadv_dhcp_recipient
635 batadv_gw_dhcp_recipient_get(struct sk_buff *skb, unsigned int *header_len,
638 enum batadv_dhcp_recipient ret = BATADV_DHCP_NO;
639 struct ethhdr *ethhdr;
641 struct ipv6hdr *ipv6hdr;
642 struct udphdr *udphdr;
643 struct vlan_ethhdr *vhdr;
648 /* check for ethernet header */
649 if (!pskb_may_pull(skb, *header_len + ETH_HLEN))
650 return BATADV_DHCP_NO;
652 ethhdr = eth_hdr(skb);
653 proto = ethhdr->h_proto;
654 *header_len += ETH_HLEN;
656 /* check for initial vlan header */
657 if (proto == htons(ETH_P_8021Q)) {
658 if (!pskb_may_pull(skb, *header_len + VLAN_HLEN))
659 return BATADV_DHCP_NO;
661 vhdr = vlan_eth_hdr(skb);
662 proto = vhdr->h_vlan_encapsulated_proto;
663 *header_len += VLAN_HLEN;
666 /* check for ip header */
668 case htons(ETH_P_IP):
669 if (!pskb_may_pull(skb, *header_len + sizeof(*iphdr)))
670 return BATADV_DHCP_NO;
672 iphdr = (struct iphdr *)(skb->data + *header_len);
673 *header_len += iphdr->ihl * 4;
675 /* check for udp header */
676 if (iphdr->protocol != IPPROTO_UDP)
677 return BATADV_DHCP_NO;
680 case htons(ETH_P_IPV6):
681 if (!pskb_may_pull(skb, *header_len + sizeof(*ipv6hdr)))
682 return BATADV_DHCP_NO;
684 ipv6hdr = (struct ipv6hdr *)(skb->data + *header_len);
685 *header_len += sizeof(*ipv6hdr);
687 /* check for udp header */
688 if (ipv6hdr->nexthdr != IPPROTO_UDP)
689 return BATADV_DHCP_NO;
693 return BATADV_DHCP_NO;
696 if (!pskb_may_pull(skb, *header_len + sizeof(*udphdr)))
697 return BATADV_DHCP_NO;
699 udphdr = (struct udphdr *)(skb->data + *header_len);
700 *header_len += sizeof(*udphdr);
702 /* check for bootp port */
704 case htons(ETH_P_IP):
705 if (udphdr->dest == htons(67))
706 ret = BATADV_DHCP_TO_SERVER;
707 else if (udphdr->source == htons(67))
708 ret = BATADV_DHCP_TO_CLIENT;
710 case htons(ETH_P_IPV6):
711 if (udphdr->dest == htons(547))
712 ret = BATADV_DHCP_TO_SERVER;
713 else if (udphdr->source == htons(547))
714 ret = BATADV_DHCP_TO_CLIENT;
718 chaddr_offset = *header_len + BATADV_DHCP_CHADDR_OFFSET;
719 /* store the client address if the message is going to a client */
720 if (ret == BATADV_DHCP_TO_CLIENT &&
721 pskb_may_pull(skb, chaddr_offset + ETH_ALEN)) {
722 /* check if the DHCP packet carries an Ethernet DHCP */
723 p = skb->data + *header_len + BATADV_DHCP_HTYPE_OFFSET;
724 if (*p != BATADV_DHCP_HTYPE_ETHERNET)
725 return BATADV_DHCP_NO;
727 /* check if the DHCP packet carries a valid Ethernet address */
728 p = skb->data + *header_len + BATADV_DHCP_HLEN_OFFSET;
730 return BATADV_DHCP_NO;
732 ether_addr_copy(chaddr, skb->data + chaddr_offset);
739 * batadv_gw_out_of_range() - check if the dhcp request destination is the best
741 * @bat_priv: the bat priv with all the soft interface information
742 * @skb: the outgoing packet
744 * Check if the skb is a DHCP request and if it is sent to the current best GW
745 * server. Due to topology changes it may be the case that the GW server
746 * previously selected is not the best one anymore.
748 * This call might reallocate skb data.
749 * Must be invoked only when the DHCP packet is going TO a DHCP SERVER.
751 * Return: true if the packet destination is unicast and it is not the best gw,
754 bool batadv_gw_out_of_range(struct batadv_priv *bat_priv,
757 struct batadv_neigh_node *neigh_curr = NULL;
758 struct batadv_neigh_node *neigh_old = NULL;
759 struct batadv_orig_node *orig_dst_node = NULL;
760 struct batadv_gw_node *gw_node = NULL;
761 struct batadv_gw_node *curr_gw = NULL;
762 struct batadv_neigh_ifinfo *curr_ifinfo, *old_ifinfo;
763 struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
764 bool out_of_range = false;
768 vid = batadv_get_vid(skb, 0);
770 if (is_multicast_ether_addr(ethhdr->h_dest))
773 orig_dst_node = batadv_transtable_search(bat_priv, ethhdr->h_source,
774 ethhdr->h_dest, vid);
778 gw_node = batadv_gw_node_get(bat_priv, orig_dst_node);
782 switch (atomic_read(&bat_priv->gw.mode)) {
783 case BATADV_GW_MODE_SERVER:
784 /* If we are a GW then we are our best GW. We can artificially
785 * set the tq towards ourself as the maximum value
787 curr_tq_avg = BATADV_TQ_MAX_VALUE;
789 case BATADV_GW_MODE_CLIENT:
790 curr_gw = batadv_gw_get_selected_gw_node(bat_priv);
794 /* packet is going to our gateway */
795 if (curr_gw->orig_node == orig_dst_node)
798 /* If the dhcp packet has been sent to a different gw,
799 * we have to evaluate whether the old gw is still
802 neigh_curr = batadv_find_router(bat_priv, curr_gw->orig_node,
807 curr_ifinfo = batadv_neigh_ifinfo_get(neigh_curr,
812 curr_tq_avg = curr_ifinfo->bat_iv.tq_avg;
813 batadv_neigh_ifinfo_put(curr_ifinfo);
816 case BATADV_GW_MODE_OFF:
821 neigh_old = batadv_find_router(bat_priv, orig_dst_node, NULL);
825 old_ifinfo = batadv_neigh_ifinfo_get(neigh_old, BATADV_IF_DEFAULT);
829 if ((curr_tq_avg - old_ifinfo->bat_iv.tq_avg) > BATADV_GW_THRESHOLD)
831 batadv_neigh_ifinfo_put(old_ifinfo);
835 batadv_orig_node_put(orig_dst_node);
837 batadv_gw_node_put(curr_gw);
839 batadv_gw_node_put(gw_node);
841 batadv_neigh_node_put(neigh_old);
843 batadv_neigh_node_put(neigh_curr);