1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (C) 2009-2019 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 "hard-interface.h"
53 #include "originator.h"
55 #include "soft-interface.h"
57 #include "translation-table.h"
59 /* These are the offsets of the "hw type" and "hw address length" in the dhcp
60 * packet starting at the beginning of the dhcp header
62 #define BATADV_DHCP_HTYPE_OFFSET 1
63 #define BATADV_DHCP_HLEN_OFFSET 2
64 /* Value of htype representing Ethernet */
65 #define BATADV_DHCP_HTYPE_ETHERNET 0x01
66 /* This is the offset of the "chaddr" field in the dhcp packet starting at the
67 * beginning of the dhcp header
69 #define BATADV_DHCP_CHADDR_OFFSET 28
72 * batadv_gw_node_release() - release gw_node from lists and queue for free
73 * after rcu grace period
74 * @ref: kref pointer of the gw_node
76 static void batadv_gw_node_release(struct kref *ref)
78 struct batadv_gw_node *gw_node;
80 gw_node = container_of(ref, struct batadv_gw_node, refcount);
82 batadv_orig_node_put(gw_node->orig_node);
83 kfree_rcu(gw_node, rcu);
87 * batadv_gw_node_put() - decrement the gw_node refcounter and possibly release
89 * @gw_node: gateway node to free
91 void batadv_gw_node_put(struct batadv_gw_node *gw_node)
93 kref_put(&gw_node->refcount, batadv_gw_node_release);
97 * batadv_gw_get_selected_gw_node() - Get currently selected gateway
98 * @bat_priv: the bat priv with all the soft interface information
100 * Return: selected gateway (with increased refcnt), NULL on errors
102 struct batadv_gw_node *
103 batadv_gw_get_selected_gw_node(struct batadv_priv *bat_priv)
105 struct batadv_gw_node *gw_node;
108 gw_node = rcu_dereference(bat_priv->gw.curr_gw);
112 if (!kref_get_unless_zero(&gw_node->refcount))
121 * batadv_gw_get_selected_orig() - Get originator of currently selected gateway
122 * @bat_priv: the bat priv with all the soft interface information
124 * Return: orig_node of selected gateway (with increased refcnt), NULL on errors
126 struct batadv_orig_node *
127 batadv_gw_get_selected_orig(struct batadv_priv *bat_priv)
129 struct batadv_gw_node *gw_node;
130 struct batadv_orig_node *orig_node = NULL;
132 gw_node = batadv_gw_get_selected_gw_node(bat_priv);
137 orig_node = gw_node->orig_node;
141 if (!kref_get_unless_zero(&orig_node->refcount))
148 batadv_gw_node_put(gw_node);
152 static void batadv_gw_select(struct batadv_priv *bat_priv,
153 struct batadv_gw_node *new_gw_node)
155 struct batadv_gw_node *curr_gw_node;
157 spin_lock_bh(&bat_priv->gw.list_lock);
160 kref_get(&new_gw_node->refcount);
162 curr_gw_node = rcu_dereference_protected(bat_priv->gw.curr_gw, 1);
163 rcu_assign_pointer(bat_priv->gw.curr_gw, new_gw_node);
166 batadv_gw_node_put(curr_gw_node);
168 spin_unlock_bh(&bat_priv->gw.list_lock);
172 * batadv_gw_reselect() - force a gateway reselection
173 * @bat_priv: the bat priv with all the soft interface information
175 * Set a flag to remind the GW component to perform a new gateway reselection.
176 * However this function does not ensure that the current gateway is going to be
177 * deselected. The reselection mechanism may elect the same gateway once again.
179 * This means that invoking batadv_gw_reselect() does not guarantee a gateway
180 * change and therefore a uevent is not necessarily expected.
182 void batadv_gw_reselect(struct batadv_priv *bat_priv)
184 atomic_set(&bat_priv->gw.reselect, 1);
188 * batadv_gw_check_client_stop() - check if client mode has been switched off
189 * @bat_priv: the bat priv with all the soft interface information
191 * This function assumes the caller has checked that the gw state *is actually
192 * changing*. This function is not supposed to be called when there is no state
195 void batadv_gw_check_client_stop(struct batadv_priv *bat_priv)
197 struct batadv_gw_node *curr_gw;
199 if (atomic_read(&bat_priv->gw.mode) != BATADV_GW_MODE_CLIENT)
202 curr_gw = batadv_gw_get_selected_gw_node(bat_priv);
206 /* deselect the current gateway so that next time that client mode is
207 * enabled a proper GW_ADD event can be sent
209 batadv_gw_select(bat_priv, NULL);
211 /* if batman-adv is switching the gw client mode off and a gateway was
212 * already selected, send a DEL uevent
214 batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL, NULL);
216 batadv_gw_node_put(curr_gw);
220 * batadv_gw_election() - Elect the best gateway
221 * @bat_priv: the bat priv with all the soft interface information
223 void batadv_gw_election(struct batadv_priv *bat_priv)
225 struct batadv_gw_node *curr_gw = NULL;
226 struct batadv_gw_node *next_gw = NULL;
227 struct batadv_neigh_node *router = NULL;
228 struct batadv_neigh_ifinfo *router_ifinfo = NULL;
229 char gw_addr[18] = { '\0' };
231 if (atomic_read(&bat_priv->gw.mode) != BATADV_GW_MODE_CLIENT)
234 if (!bat_priv->algo_ops->gw.get_best_gw_node)
237 curr_gw = batadv_gw_get_selected_gw_node(bat_priv);
239 if (!batadv_atomic_dec_not_zero(&bat_priv->gw.reselect) && curr_gw)
242 /* if gw.reselect is set to 1 it means that a previous call to
243 * gw.is_eligible() said that we have a new best GW, therefore it can
244 * now be picked from the list and selected
246 next_gw = bat_priv->algo_ops->gw.get_best_gw_node(bat_priv);
248 if (curr_gw == next_gw)
252 sprintf(gw_addr, "%pM", next_gw->orig_node->orig);
254 router = batadv_orig_router_get(next_gw->orig_node,
257 batadv_gw_reselect(bat_priv);
261 router_ifinfo = batadv_neigh_ifinfo_get(router,
263 if (!router_ifinfo) {
264 batadv_gw_reselect(bat_priv);
269 if (curr_gw && !next_gw) {
270 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
271 "Removing selected gateway - no gateway in range\n");
272 batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL,
274 } else if (!curr_gw && next_gw) {
275 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
276 "Adding route to gateway %pM (bandwidth: %u.%u/%u.%u MBit, tq: %i)\n",
277 next_gw->orig_node->orig,
278 next_gw->bandwidth_down / 10,
279 next_gw->bandwidth_down % 10,
280 next_gw->bandwidth_up / 10,
281 next_gw->bandwidth_up % 10,
282 router_ifinfo->bat_iv.tq_avg);
283 batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_ADD,
286 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
287 "Changing route to gateway %pM (bandwidth: %u.%u/%u.%u MBit, tq: %i)\n",
288 next_gw->orig_node->orig,
289 next_gw->bandwidth_down / 10,
290 next_gw->bandwidth_down % 10,
291 next_gw->bandwidth_up / 10,
292 next_gw->bandwidth_up % 10,
293 router_ifinfo->bat_iv.tq_avg);
294 batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_CHANGE,
298 batadv_gw_select(bat_priv, next_gw);
302 batadv_gw_node_put(curr_gw);
304 batadv_gw_node_put(next_gw);
306 batadv_neigh_node_put(router);
308 batadv_neigh_ifinfo_put(router_ifinfo);
312 * batadv_gw_check_election() - Elect orig node as best gateway when eligible
313 * @bat_priv: the bat priv with all the soft interface information
314 * @orig_node: orig node which is to be checked
316 void batadv_gw_check_election(struct batadv_priv *bat_priv,
317 struct batadv_orig_node *orig_node)
319 struct batadv_orig_node *curr_gw_orig;
321 /* abort immediately if the routing algorithm does not support gateway
324 if (!bat_priv->algo_ops->gw.is_eligible)
327 curr_gw_orig = batadv_gw_get_selected_orig(bat_priv);
331 /* this node already is the gateway */
332 if (curr_gw_orig == orig_node)
335 if (!bat_priv->algo_ops->gw.is_eligible(bat_priv, curr_gw_orig,
340 batadv_gw_reselect(bat_priv);
343 batadv_orig_node_put(curr_gw_orig);
347 * batadv_gw_node_add() - add gateway node to list of available gateways
348 * @bat_priv: the bat priv with all the soft interface information
349 * @orig_node: originator announcing gateway capabilities
350 * @gateway: announced bandwidth information
352 * Has to be called with the appropriate locks being acquired
355 static void batadv_gw_node_add(struct batadv_priv *bat_priv,
356 struct batadv_orig_node *orig_node,
357 struct batadv_tvlv_gateway_data *gateway)
359 struct batadv_gw_node *gw_node;
361 lockdep_assert_held(&bat_priv->gw.list_lock);
363 if (gateway->bandwidth_down == 0)
366 gw_node = kzalloc(sizeof(*gw_node), GFP_ATOMIC);
370 kref_init(&gw_node->refcount);
371 INIT_HLIST_NODE(&gw_node->list);
372 kref_get(&orig_node->refcount);
373 gw_node->orig_node = orig_node;
374 gw_node->bandwidth_down = ntohl(gateway->bandwidth_down);
375 gw_node->bandwidth_up = ntohl(gateway->bandwidth_up);
377 kref_get(&gw_node->refcount);
378 hlist_add_head_rcu(&gw_node->list, &bat_priv->gw.gateway_list);
379 bat_priv->gw.generation++;
381 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
382 "Found new gateway %pM -> gw bandwidth: %u.%u/%u.%u MBit\n",
384 ntohl(gateway->bandwidth_down) / 10,
385 ntohl(gateway->bandwidth_down) % 10,
386 ntohl(gateway->bandwidth_up) / 10,
387 ntohl(gateway->bandwidth_up) % 10);
389 /* don't return reference to new gw_node */
390 batadv_gw_node_put(gw_node);
394 * batadv_gw_node_get() - retrieve gateway node from list of available gateways
395 * @bat_priv: the bat priv with all the soft interface information
396 * @orig_node: originator announcing gateway capabilities
398 * Return: gateway node if found or NULL otherwise.
400 struct batadv_gw_node *batadv_gw_node_get(struct batadv_priv *bat_priv,
401 struct batadv_orig_node *orig_node)
403 struct batadv_gw_node *gw_node_tmp, *gw_node = NULL;
406 hlist_for_each_entry_rcu(gw_node_tmp, &bat_priv->gw.gateway_list,
408 if (gw_node_tmp->orig_node != orig_node)
411 if (!kref_get_unless_zero(&gw_node_tmp->refcount))
414 gw_node = gw_node_tmp;
423 * batadv_gw_node_update() - update list of available gateways with changed
424 * bandwidth information
425 * @bat_priv: the bat priv with all the soft interface information
426 * @orig_node: originator announcing gateway capabilities
427 * @gateway: announced bandwidth information
429 void batadv_gw_node_update(struct batadv_priv *bat_priv,
430 struct batadv_orig_node *orig_node,
431 struct batadv_tvlv_gateway_data *gateway)
433 struct batadv_gw_node *gw_node, *curr_gw = NULL;
435 spin_lock_bh(&bat_priv->gw.list_lock);
436 gw_node = batadv_gw_node_get(bat_priv, orig_node);
438 batadv_gw_node_add(bat_priv, orig_node, gateway);
439 spin_unlock_bh(&bat_priv->gw.list_lock);
442 spin_unlock_bh(&bat_priv->gw.list_lock);
444 if (gw_node->bandwidth_down == ntohl(gateway->bandwidth_down) &&
445 gw_node->bandwidth_up == ntohl(gateway->bandwidth_up))
448 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
449 "Gateway bandwidth of originator %pM changed from %u.%u/%u.%u MBit to %u.%u/%u.%u MBit\n",
451 gw_node->bandwidth_down / 10,
452 gw_node->bandwidth_down % 10,
453 gw_node->bandwidth_up / 10,
454 gw_node->bandwidth_up % 10,
455 ntohl(gateway->bandwidth_down) / 10,
456 ntohl(gateway->bandwidth_down) % 10,
457 ntohl(gateway->bandwidth_up) / 10,
458 ntohl(gateway->bandwidth_up) % 10);
460 gw_node->bandwidth_down = ntohl(gateway->bandwidth_down);
461 gw_node->bandwidth_up = ntohl(gateway->bandwidth_up);
463 if (ntohl(gateway->bandwidth_down) == 0) {
464 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
465 "Gateway %pM removed from gateway list\n",
468 /* Note: We don't need a NULL check here, since curr_gw never
471 spin_lock_bh(&bat_priv->gw.list_lock);
472 if (!hlist_unhashed(&gw_node->list)) {
473 hlist_del_init_rcu(&gw_node->list);
474 batadv_gw_node_put(gw_node);
475 bat_priv->gw.generation++;
477 spin_unlock_bh(&bat_priv->gw.list_lock);
479 curr_gw = batadv_gw_get_selected_gw_node(bat_priv);
480 if (gw_node == curr_gw)
481 batadv_gw_reselect(bat_priv);
484 batadv_gw_node_put(curr_gw);
489 batadv_gw_node_put(gw_node);
493 * batadv_gw_node_delete() - Remove orig_node from gateway list
494 * @bat_priv: the bat priv with all the soft interface information
495 * @orig_node: orig node which is currently in process of being removed
497 void batadv_gw_node_delete(struct batadv_priv *bat_priv,
498 struct batadv_orig_node *orig_node)
500 struct batadv_tvlv_gateway_data gateway;
502 gateway.bandwidth_down = 0;
503 gateway.bandwidth_up = 0;
505 batadv_gw_node_update(bat_priv, orig_node, &gateway);
509 * batadv_gw_node_free() - Free gateway information from soft interface
510 * @bat_priv: the bat priv with all the soft interface information
512 void batadv_gw_node_free(struct batadv_priv *bat_priv)
514 struct batadv_gw_node *gw_node;
515 struct hlist_node *node_tmp;
517 spin_lock_bh(&bat_priv->gw.list_lock);
518 hlist_for_each_entry_safe(gw_node, node_tmp,
519 &bat_priv->gw.gateway_list, list) {
520 hlist_del_init_rcu(&gw_node->list);
521 batadv_gw_node_put(gw_node);
522 bat_priv->gw.generation++;
524 spin_unlock_bh(&bat_priv->gw.list_lock);
527 #ifdef CONFIG_BATMAN_ADV_DEBUGFS
530 * batadv_gw_client_seq_print_text() - Print the gateway table in a seq file
531 * @seq: seq file to print on
536 int batadv_gw_client_seq_print_text(struct seq_file *seq, void *offset)
538 struct net_device *net_dev = (struct net_device *)seq->private;
539 struct batadv_priv *bat_priv = netdev_priv(net_dev);
540 struct batadv_hard_iface *primary_if;
542 primary_if = batadv_seq_print_text_primary_if_get(seq);
546 seq_printf(seq, "[B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s %s)]\n",
547 BATADV_SOURCE_VERSION, primary_if->net_dev->name,
548 primary_if->net_dev->dev_addr, net_dev->name,
549 bat_priv->algo_ops->name);
551 batadv_hardif_put(primary_if);
553 if (!bat_priv->algo_ops->gw.print) {
555 "No printing function for this routing protocol\n");
559 bat_priv->algo_ops->gw.print(bat_priv, seq);
566 * batadv_gw_dump() - Dump gateways into a message
567 * @msg: Netlink message to dump into
568 * @cb: Control block containing additional options
570 * Return: Error code, or length of message
572 int batadv_gw_dump(struct sk_buff *msg, struct netlink_callback *cb)
574 struct batadv_hard_iface *primary_if = NULL;
575 struct net *net = sock_net(cb->skb->sk);
576 struct net_device *soft_iface;
577 struct batadv_priv *bat_priv;
581 ifindex = batadv_netlink_get_ifindex(cb->nlh,
582 BATADV_ATTR_MESH_IFINDEX);
586 soft_iface = dev_get_by_index(net, ifindex);
587 if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
592 bat_priv = netdev_priv(soft_iface);
594 primary_if = batadv_primary_if_get_selected(bat_priv);
595 if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) {
600 if (!bat_priv->algo_ops->gw.dump) {
605 bat_priv->algo_ops->gw.dump(msg, cb, bat_priv);
611 batadv_hardif_put(primary_if);
619 * batadv_gw_dhcp_recipient_get() - check if a packet is a DHCP message
620 * @skb: the packet to check
621 * @header_len: a pointer to the batman-adv header size
622 * @chaddr: buffer where the client address will be stored. Valid
623 * only if the function returns BATADV_DHCP_TO_CLIENT
625 * This function may re-allocate the data buffer of the skb passed as argument.
628 * - BATADV_DHCP_NO if the packet is not a dhcp message or if there was an error
630 * - BATADV_DHCP_TO_SERVER if this is a message going to the DHCP server
631 * - BATADV_DHCP_TO_CLIENT if this is a message going to a DHCP client
633 enum batadv_dhcp_recipient
634 batadv_gw_dhcp_recipient_get(struct sk_buff *skb, unsigned int *header_len,
637 enum batadv_dhcp_recipient ret = BATADV_DHCP_NO;
638 struct ethhdr *ethhdr;
640 struct ipv6hdr *ipv6hdr;
641 struct udphdr *udphdr;
642 struct vlan_ethhdr *vhdr;
647 /* check for ethernet header */
648 if (!pskb_may_pull(skb, *header_len + ETH_HLEN))
649 return BATADV_DHCP_NO;
651 ethhdr = eth_hdr(skb);
652 proto = ethhdr->h_proto;
653 *header_len += ETH_HLEN;
655 /* check for initial vlan header */
656 if (proto == htons(ETH_P_8021Q)) {
657 if (!pskb_may_pull(skb, *header_len + VLAN_HLEN))
658 return BATADV_DHCP_NO;
660 vhdr = vlan_eth_hdr(skb);
661 proto = vhdr->h_vlan_encapsulated_proto;
662 *header_len += VLAN_HLEN;
665 /* check for ip header */
667 case htons(ETH_P_IP):
668 if (!pskb_may_pull(skb, *header_len + sizeof(*iphdr)))
669 return BATADV_DHCP_NO;
671 iphdr = (struct iphdr *)(skb->data + *header_len);
672 *header_len += iphdr->ihl * 4;
674 /* check for udp header */
675 if (iphdr->protocol != IPPROTO_UDP)
676 return BATADV_DHCP_NO;
679 case htons(ETH_P_IPV6):
680 if (!pskb_may_pull(skb, *header_len + sizeof(*ipv6hdr)))
681 return BATADV_DHCP_NO;
683 ipv6hdr = (struct ipv6hdr *)(skb->data + *header_len);
684 *header_len += sizeof(*ipv6hdr);
686 /* check for udp header */
687 if (ipv6hdr->nexthdr != IPPROTO_UDP)
688 return BATADV_DHCP_NO;
692 return BATADV_DHCP_NO;
695 if (!pskb_may_pull(skb, *header_len + sizeof(*udphdr)))
696 return BATADV_DHCP_NO;
698 udphdr = (struct udphdr *)(skb->data + *header_len);
699 *header_len += sizeof(*udphdr);
701 /* check for bootp port */
703 case htons(ETH_P_IP):
704 if (udphdr->dest == htons(67))
705 ret = BATADV_DHCP_TO_SERVER;
706 else if (udphdr->source == htons(67))
707 ret = BATADV_DHCP_TO_CLIENT;
709 case htons(ETH_P_IPV6):
710 if (udphdr->dest == htons(547))
711 ret = BATADV_DHCP_TO_SERVER;
712 else if (udphdr->source == htons(547))
713 ret = BATADV_DHCP_TO_CLIENT;
717 chaddr_offset = *header_len + BATADV_DHCP_CHADDR_OFFSET;
718 /* store the client address if the message is going to a client */
719 if (ret == BATADV_DHCP_TO_CLIENT &&
720 pskb_may_pull(skb, chaddr_offset + ETH_ALEN)) {
721 /* check if the DHCP packet carries an Ethernet DHCP */
722 p = skb->data + *header_len + BATADV_DHCP_HTYPE_OFFSET;
723 if (*p != BATADV_DHCP_HTYPE_ETHERNET)
724 return BATADV_DHCP_NO;
726 /* check if the DHCP packet carries a valid Ethernet address */
727 p = skb->data + *header_len + BATADV_DHCP_HLEN_OFFSET;
729 return BATADV_DHCP_NO;
731 ether_addr_copy(chaddr, skb->data + chaddr_offset);
738 * batadv_gw_out_of_range() - check if the dhcp request destination is the best
740 * @bat_priv: the bat priv with all the soft interface information
741 * @skb: the outgoing packet
743 * Check if the skb is a DHCP request and if it is sent to the current best GW
744 * server. Due to topology changes it may be the case that the GW server
745 * previously selected is not the best one anymore.
747 * This call might reallocate skb data.
748 * Must be invoked only when the DHCP packet is going TO a DHCP SERVER.
750 * Return: true if the packet destination is unicast and it is not the best gw,
753 bool batadv_gw_out_of_range(struct batadv_priv *bat_priv,
756 struct batadv_neigh_node *neigh_curr = NULL;
757 struct batadv_neigh_node *neigh_old = NULL;
758 struct batadv_orig_node *orig_dst_node = NULL;
759 struct batadv_gw_node *gw_node = NULL;
760 struct batadv_gw_node *curr_gw = NULL;
761 struct batadv_neigh_ifinfo *curr_ifinfo, *old_ifinfo;
762 struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
763 bool out_of_range = false;
767 vid = batadv_get_vid(skb, 0);
769 if (is_multicast_ether_addr(ethhdr->h_dest))
772 orig_dst_node = batadv_transtable_search(bat_priv, ethhdr->h_source,
773 ethhdr->h_dest, vid);
777 gw_node = batadv_gw_node_get(bat_priv, orig_dst_node);
781 switch (atomic_read(&bat_priv->gw.mode)) {
782 case BATADV_GW_MODE_SERVER:
783 /* If we are a GW then we are our best GW. We can artificially
784 * set the tq towards ourself as the maximum value
786 curr_tq_avg = BATADV_TQ_MAX_VALUE;
788 case BATADV_GW_MODE_CLIENT:
789 curr_gw = batadv_gw_get_selected_gw_node(bat_priv);
793 /* packet is going to our gateway */
794 if (curr_gw->orig_node == orig_dst_node)
797 /* If the dhcp packet has been sent to a different gw,
798 * we have to evaluate whether the old gw is still
801 neigh_curr = batadv_find_router(bat_priv, curr_gw->orig_node,
806 curr_ifinfo = batadv_neigh_ifinfo_get(neigh_curr,
811 curr_tq_avg = curr_ifinfo->bat_iv.tq_avg;
812 batadv_neigh_ifinfo_put(curr_ifinfo);
815 case BATADV_GW_MODE_OFF:
820 neigh_old = batadv_find_router(bat_priv, orig_dst_node, NULL);
824 old_ifinfo = batadv_neigh_ifinfo_get(neigh_old, BATADV_IF_DEFAULT);
828 if ((curr_tq_avg - old_ifinfo->bat_iv.tq_avg) > BATADV_GW_THRESHOLD)
830 batadv_neigh_ifinfo_put(old_ifinfo);
834 batadv_orig_node_put(orig_dst_node);
836 batadv_gw_node_put(curr_gw);
838 batadv_gw_node_put(gw_node);
840 batadv_neigh_node_put(neigh_old);
842 batadv_neigh_node_put(neigh_curr);