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0046b040 | 1 | /* Copyright (C) 2009-2016 B.A.T.M.A.N. contributors: |
c6c8fea2 SE |
2 | * |
3 | * Marek Lindner | |
4 | * | |
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. | |
8 | * | |
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. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
ebf38fb7 | 15 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
c6c8fea2 SE |
16 | */ |
17 | ||
c6c8fea2 | 18 | #include "gateway_client.h" |
1e2c2a4f SE |
19 | #include "main.h" |
20 | ||
21 | #include <linux/atomic.h> | |
22 | #include <linux/byteorder/generic.h> | |
23 | #include <linux/etherdevice.h> | |
24 | #include <linux/fs.h> | |
25 | #include <linux/if_ether.h> | |
26 | #include <linux/if_vlan.h> | |
27 | #include <linux/in.h> | |
28 | #include <linux/ip.h> | |
29 | #include <linux/ipv6.h> | |
1e2c2a4f | 30 | #include <linux/kernel.h> |
e7aed321 | 31 | #include <linux/kref.h> |
1e2c2a4f SE |
32 | #include <linux/list.h> |
33 | #include <linux/netdevice.h> | |
34 | #include <linux/rculist.h> | |
35 | #include <linux/rcupdate.h> | |
36 | #include <linux/seq_file.h> | |
37 | #include <linux/skbuff.h> | |
38 | #include <linux/slab.h> | |
39 | #include <linux/spinlock.h> | |
40 | #include <linux/stddef.h> | |
41 | #include <linux/udp.h> | |
42 | ||
c6c8fea2 SE |
43 | #include "gateway_common.h" |
44 | #include "hard-interface.h" | |
57f0c07c | 45 | #include "originator.h" |
1e2c2a4f | 46 | #include "packet.h" |
43676ab5 | 47 | #include "routing.h" |
1e2c2a4f SE |
48 | #include "sysfs.h" |
49 | #include "translation-table.h" | |
c6c8fea2 | 50 | |
6c413b1c AQ |
51 | /* These are the offsets of the "hw type" and "hw address length" in the dhcp |
52 | * packet starting at the beginning of the dhcp header | |
9cfc7bd6 | 53 | */ |
6c413b1c AQ |
54 | #define BATADV_DHCP_HTYPE_OFFSET 1 |
55 | #define BATADV_DHCP_HLEN_OFFSET 2 | |
56 | /* Value of htype representing Ethernet */ | |
57 | #define BATADV_DHCP_HTYPE_ETHERNET 0x01 | |
58 | /* This is the offset of the "chaddr" field in the dhcp packet starting at the | |
59 | * beginning of the dhcp header | |
60 | */ | |
61 | #define BATADV_DHCP_CHADDR_OFFSET 28 | |
43676ab5 | 62 | |
e7aed321 SE |
63 | /** |
64 | * batadv_gw_node_release - release gw_node from lists and queue for free after | |
65 | * rcu grace period | |
66 | * @ref: kref pointer of the gw_node | |
67 | */ | |
68 | static void batadv_gw_node_release(struct kref *ref) | |
69 | { | |
70 | struct batadv_gw_node *gw_node; | |
71 | ||
72 | gw_node = container_of(ref, struct batadv_gw_node, refcount); | |
73 | ||
5d967310 | 74 | batadv_orig_node_put(gw_node->orig_node); |
e7aed321 SE |
75 | kfree_rcu(gw_node, rcu); |
76 | } | |
77 | ||
78 | /** | |
3a01743d | 79 | * batadv_gw_node_put - decrement the gw_node refcounter and possibly release it |
e7aed321 SE |
80 | * @gw_node: gateway node to free |
81 | */ | |
3a01743d | 82 | static void batadv_gw_node_put(struct batadv_gw_node *gw_node) |
c6c8fea2 | 83 | { |
e7aed321 | 84 | kref_put(&gw_node->refcount, batadv_gw_node_release); |
c6c8fea2 SE |
85 | } |
86 | ||
56303d34 SE |
87 | static struct batadv_gw_node * |
88 | batadv_gw_get_selected_gw_node(struct batadv_priv *bat_priv) | |
c6c8fea2 | 89 | { |
56303d34 | 90 | struct batadv_gw_node *gw_node; |
c6c8fea2 | 91 | |
5d02b3cd | 92 | rcu_read_lock(); |
807736f6 | 93 | gw_node = rcu_dereference(bat_priv->gw.curr_gw); |
c4aac1ab | 94 | if (!gw_node) |
7b36e8ee | 95 | goto out; |
c6c8fea2 | 96 | |
e7aed321 | 97 | if (!kref_get_unless_zero(&gw_node->refcount)) |
c4aac1ab | 98 | gw_node = NULL; |
43c70ad5 | 99 | |
5d02b3cd LL |
100 | out: |
101 | rcu_read_unlock(); | |
c4aac1ab | 102 | return gw_node; |
c6c8fea2 SE |
103 | } |
104 | ||
56303d34 SE |
105 | struct batadv_orig_node * |
106 | batadv_gw_get_selected_orig(struct batadv_priv *bat_priv) | |
c6c8fea2 | 107 | { |
56303d34 SE |
108 | struct batadv_gw_node *gw_node; |
109 | struct batadv_orig_node *orig_node = NULL; | |
c6c8fea2 | 110 | |
1409a834 | 111 | gw_node = batadv_gw_get_selected_gw_node(bat_priv); |
c4aac1ab ML |
112 | if (!gw_node) |
113 | goto out; | |
114 | ||
115 | rcu_read_lock(); | |
116 | orig_node = gw_node->orig_node; | |
117 | if (!orig_node) | |
118 | goto unlock; | |
119 | ||
7c124391 | 120 | if (!kref_get_unless_zero(&orig_node->refcount)) |
c4aac1ab | 121 | orig_node = NULL; |
c6c8fea2 | 122 | |
c4aac1ab ML |
123 | unlock: |
124 | rcu_read_unlock(); | |
125 | out: | |
c6c8fea2 | 126 | if (gw_node) |
3a01743d | 127 | batadv_gw_node_put(gw_node); |
c4aac1ab | 128 | return orig_node; |
c6c8fea2 SE |
129 | } |
130 | ||
56303d34 SE |
131 | static void batadv_gw_select(struct batadv_priv *bat_priv, |
132 | struct batadv_gw_node *new_gw_node) | |
c6c8fea2 | 133 | { |
56303d34 | 134 | struct batadv_gw_node *curr_gw_node; |
c6c8fea2 | 135 | |
807736f6 | 136 | spin_lock_bh(&bat_priv->gw.list_lock); |
c4aac1ab | 137 | |
a08d497d SE |
138 | if (new_gw_node) |
139 | kref_get(&new_gw_node->refcount); | |
c6c8fea2 | 140 | |
807736f6 SE |
141 | curr_gw_node = rcu_dereference_protected(bat_priv->gw.curr_gw, 1); |
142 | rcu_assign_pointer(bat_priv->gw.curr_gw, new_gw_node); | |
25b6d3c1 ML |
143 | |
144 | if (curr_gw_node) | |
3a01743d | 145 | batadv_gw_node_put(curr_gw_node); |
c4aac1ab | 146 | |
807736f6 | 147 | spin_unlock_bh(&bat_priv->gw.list_lock); |
c4aac1ab ML |
148 | } |
149 | ||
4e820e72 AQ |
150 | /** |
151 | * batadv_gw_reselect - force a gateway reselection | |
152 | * @bat_priv: the bat priv with all the soft interface information | |
153 | * | |
154 | * Set a flag to remind the GW component to perform a new gateway reselection. | |
155 | * However this function does not ensure that the current gateway is going to be | |
156 | * deselected. The reselection mechanism may elect the same gateway once again. | |
157 | * | |
158 | * This means that invoking batadv_gw_reselect() does not guarantee a gateway | |
159 | * change and therefore a uevent is not necessarily expected. | |
160 | */ | |
161 | void batadv_gw_reselect(struct batadv_priv *bat_priv) | |
c4aac1ab | 162 | { |
807736f6 | 163 | atomic_set(&bat_priv->gw.reselect, 1); |
c6c8fea2 SE |
164 | } |
165 | ||
56303d34 SE |
166 | static struct batadv_gw_node * |
167 | batadv_gw_get_best_gw_node(struct batadv_priv *bat_priv) | |
c6c8fea2 | 168 | { |
56303d34 | 169 | struct batadv_neigh_node *router; |
89652331 | 170 | struct batadv_neigh_ifinfo *router_ifinfo; |
56303d34 | 171 | struct batadv_gw_node *gw_node, *curr_gw = NULL; |
4f248cff SE |
172 | u64 max_gw_factor = 0; |
173 | u64 tmp_gw_factor = 0; | |
6b5e971a SE |
174 | u8 max_tq = 0; |
175 | u8 tq_avg; | |
56303d34 | 176 | struct batadv_orig_node *orig_node; |
c6c8fea2 | 177 | |
c4aac1ab | 178 | rcu_read_lock(); |
b67bfe0d | 179 | hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.list, list) { |
84d5e5e0 | 180 | orig_node = gw_node->orig_node; |
7351a482 | 181 | router = batadv_orig_router_get(orig_node, BATADV_IF_DEFAULT); |
e1a5382f | 182 | if (!router) |
c6c8fea2 SE |
183 | continue; |
184 | ||
89652331 SW |
185 | router_ifinfo = batadv_neigh_ifinfo_get(router, |
186 | BATADV_IF_DEFAULT); | |
187 | if (!router_ifinfo) | |
188 | goto next; | |
189 | ||
e7aed321 | 190 | if (!kref_get_unless_zero(&gw_node->refcount)) |
2265c141 AQ |
191 | goto next; |
192 | ||
89652331 | 193 | tq_avg = router_ifinfo->bat_iv.tq_avg; |
c67893d1 | 194 | |
c6c8fea2 SE |
195 | switch (atomic_read(&bat_priv->gw_sel_class)) { |
196 | case 1: /* fast connection */ | |
414254e3 ML |
197 | tmp_gw_factor = tq_avg * tq_avg; |
198 | tmp_gw_factor *= gw_node->bandwidth_down; | |
199 | tmp_gw_factor *= 100 * 100; | |
e071d93e | 200 | tmp_gw_factor >>= 18; |
c6c8fea2 SE |
201 | |
202 | if ((tmp_gw_factor > max_gw_factor) || | |
203 | ((tmp_gw_factor == max_gw_factor) && | |
c67893d1 | 204 | (tq_avg > max_tq))) { |
2265c141 | 205 | if (curr_gw) |
3a01743d | 206 | batadv_gw_node_put(curr_gw); |
2265c141 | 207 | curr_gw = gw_node; |
e7aed321 | 208 | kref_get(&curr_gw->refcount); |
2265c141 | 209 | } |
c6c8fea2 SE |
210 | break; |
211 | ||
9cfc7bd6 | 212 | default: /* 2: stable connection (use best statistic) |
c6c8fea2 SE |
213 | * 3: fast-switch (use best statistic but change as |
214 | * soon as a better gateway appears) | |
215 | * XX: late-switch (use best statistic but change as | |
216 | * soon as a better gateway appears which has | |
217 | * $routing_class more tq points) | |
9cfc7bd6 | 218 | */ |
c67893d1 | 219 | if (tq_avg > max_tq) { |
2265c141 | 220 | if (curr_gw) |
3a01743d | 221 | batadv_gw_node_put(curr_gw); |
2265c141 | 222 | curr_gw = gw_node; |
e7aed321 | 223 | kref_get(&curr_gw->refcount); |
2265c141 | 224 | } |
c6c8fea2 SE |
225 | break; |
226 | } | |
227 | ||
c67893d1 SE |
228 | if (tq_avg > max_tq) |
229 | max_tq = tq_avg; | |
c6c8fea2 SE |
230 | |
231 | if (tmp_gw_factor > max_gw_factor) | |
232 | max_gw_factor = tmp_gw_factor; | |
e1a5382f | 233 | |
3a01743d | 234 | batadv_gw_node_put(gw_node); |
2265c141 AQ |
235 | |
236 | next: | |
25bb2509 | 237 | batadv_neigh_node_put(router); |
89652331 | 238 | if (router_ifinfo) |
044fa3ae | 239 | batadv_neigh_ifinfo_put(router_ifinfo); |
c6c8fea2 | 240 | } |
2265c141 | 241 | rcu_read_unlock(); |
c6c8fea2 | 242 | |
2265c141 AQ |
243 | return curr_gw; |
244 | } | |
c6c8fea2 | 245 | |
c6eaa3f0 AQ |
246 | /** |
247 | * batadv_gw_check_client_stop - check if client mode has been switched off | |
248 | * @bat_priv: the bat priv with all the soft interface information | |
249 | * | |
250 | * This function assumes the caller has checked that the gw state *is actually | |
251 | * changing*. This function is not supposed to be called when there is no state | |
252 | * change. | |
253 | */ | |
254 | void batadv_gw_check_client_stop(struct batadv_priv *bat_priv) | |
255 | { | |
256 | struct batadv_gw_node *curr_gw; | |
257 | ||
258 | if (atomic_read(&bat_priv->gw_mode) != BATADV_GW_MODE_CLIENT) | |
259 | return; | |
260 | ||
261 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); | |
262 | if (!curr_gw) | |
263 | return; | |
264 | ||
f3163181 AQ |
265 | /* deselect the current gateway so that next time that client mode is |
266 | * enabled a proper GW_ADD event can be sent | |
267 | */ | |
268 | batadv_gw_select(bat_priv, NULL); | |
269 | ||
c6eaa3f0 AQ |
270 | /* if batman-adv is switching the gw client mode off and a gateway was |
271 | * already selected, send a DEL uevent | |
272 | */ | |
273 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL, NULL); | |
274 | ||
3a01743d | 275 | batadv_gw_node_put(curr_gw); |
c6eaa3f0 AQ |
276 | } |
277 | ||
56303d34 | 278 | void batadv_gw_election(struct batadv_priv *bat_priv) |
2265c141 | 279 | { |
4f248cff SE |
280 | struct batadv_gw_node *curr_gw = NULL; |
281 | struct batadv_gw_node *next_gw = NULL; | |
56303d34 | 282 | struct batadv_neigh_node *router = NULL; |
89652331 | 283 | struct batadv_neigh_ifinfo *router_ifinfo = NULL; |
19595e05 | 284 | char gw_addr[18] = { '\0' }; |
2265c141 | 285 | |
cd646ab1 | 286 | if (atomic_read(&bat_priv->gw_mode) != BATADV_GW_MODE_CLIENT) |
2265c141 AQ |
287 | goto out; |
288 | ||
1409a834 | 289 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
2265c141 | 290 | |
807736f6 | 291 | if (!batadv_atomic_dec_not_zero(&bat_priv->gw.reselect) && curr_gw) |
caa0bf64 ML |
292 | goto out; |
293 | ||
1409a834 | 294 | next_gw = batadv_gw_get_best_gw_node(bat_priv); |
2265c141 AQ |
295 | |
296 | if (curr_gw == next_gw) | |
297 | goto out; | |
298 | ||
299 | if (next_gw) { | |
19595e05 AQ |
300 | sprintf(gw_addr, "%pM", next_gw->orig_node->orig); |
301 | ||
7351a482 SW |
302 | router = batadv_orig_router_get(next_gw->orig_node, |
303 | BATADV_IF_DEFAULT); | |
2265c141 | 304 | if (!router) { |
4e820e72 | 305 | batadv_gw_reselect(bat_priv); |
2265c141 AQ |
306 | goto out; |
307 | } | |
89652331 SW |
308 | |
309 | router_ifinfo = batadv_neigh_ifinfo_get(router, | |
310 | BATADV_IF_DEFAULT); | |
311 | if (!router_ifinfo) { | |
312 | batadv_gw_reselect(bat_priv); | |
313 | goto out; | |
314 | } | |
c6c8fea2 SE |
315 | } |
316 | ||
2265c141 | 317 | if ((curr_gw) && (!next_gw)) { |
39c75a51 | 318 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 319 | "Removing selected gateway - no gateway in range\n"); |
39c75a51 SE |
320 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL, |
321 | NULL); | |
2265c141 | 322 | } else if ((!curr_gw) && (next_gw)) { |
39c75a51 | 323 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
414254e3 | 324 | "Adding route to gateway %pM (bandwidth: %u.%u/%u.%u MBit, tq: %i)\n", |
1eda58bf | 325 | next_gw->orig_node->orig, |
414254e3 ML |
326 | next_gw->bandwidth_down / 10, |
327 | next_gw->bandwidth_down % 10, | |
328 | next_gw->bandwidth_up / 10, | |
89652331 SW |
329 | next_gw->bandwidth_up % 10, |
330 | router_ifinfo->bat_iv.tq_avg); | |
39c75a51 SE |
331 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_ADD, |
332 | gw_addr); | |
2265c141 | 333 | } else { |
39c75a51 | 334 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
414254e3 | 335 | "Changing route to gateway %pM (bandwidth: %u.%u/%u.%u MBit, tq: %i)\n", |
1eda58bf | 336 | next_gw->orig_node->orig, |
414254e3 ML |
337 | next_gw->bandwidth_down / 10, |
338 | next_gw->bandwidth_down % 10, | |
339 | next_gw->bandwidth_up / 10, | |
89652331 SW |
340 | next_gw->bandwidth_up % 10, |
341 | router_ifinfo->bat_iv.tq_avg); | |
39c75a51 SE |
342 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_CHANGE, |
343 | gw_addr); | |
2265c141 AQ |
344 | } |
345 | ||
1409a834 | 346 | batadv_gw_select(bat_priv, next_gw); |
2265c141 | 347 | |
c4aac1ab ML |
348 | out: |
349 | if (curr_gw) | |
3a01743d | 350 | batadv_gw_node_put(curr_gw); |
2265c141 | 351 | if (next_gw) |
3a01743d | 352 | batadv_gw_node_put(next_gw); |
2265c141 | 353 | if (router) |
25bb2509 | 354 | batadv_neigh_node_put(router); |
89652331 | 355 | if (router_ifinfo) |
044fa3ae | 356 | batadv_neigh_ifinfo_put(router_ifinfo); |
c6c8fea2 SE |
357 | } |
358 | ||
56303d34 SE |
359 | void batadv_gw_check_election(struct batadv_priv *bat_priv, |
360 | struct batadv_orig_node *orig_node) | |
c6c8fea2 | 361 | { |
89652331 SW |
362 | struct batadv_neigh_ifinfo *router_orig_tq = NULL; |
363 | struct batadv_neigh_ifinfo *router_gw_tq = NULL; | |
56303d34 | 364 | struct batadv_orig_node *curr_gw_orig; |
4f248cff SE |
365 | struct batadv_neigh_node *router_gw = NULL; |
366 | struct batadv_neigh_node *router_orig = NULL; | |
6b5e971a | 367 | u8 gw_tq_avg, orig_tq_avg; |
c6c8fea2 | 368 | |
7cf06bc6 | 369 | curr_gw_orig = batadv_gw_get_selected_orig(bat_priv); |
57f0c07c | 370 | if (!curr_gw_orig) |
4e820e72 | 371 | goto reselect; |
c6c8fea2 | 372 | |
7351a482 | 373 | router_gw = batadv_orig_router_get(curr_gw_orig, BATADV_IF_DEFAULT); |
e1a5382f | 374 | if (!router_gw) |
4e820e72 | 375 | goto reselect; |
c6c8fea2 | 376 | |
89652331 SW |
377 | router_gw_tq = batadv_neigh_ifinfo_get(router_gw, |
378 | BATADV_IF_DEFAULT); | |
379 | if (!router_gw_tq) | |
380 | goto reselect; | |
381 | ||
c6c8fea2 | 382 | /* this node already is the gateway */ |
57f0c07c | 383 | if (curr_gw_orig == orig_node) |
e1a5382f | 384 | goto out; |
c6c8fea2 | 385 | |
7351a482 | 386 | router_orig = batadv_orig_router_get(orig_node, BATADV_IF_DEFAULT); |
e1a5382f LL |
387 | if (!router_orig) |
388 | goto out; | |
5d02b3cd | 389 | |
89652331 SW |
390 | router_orig_tq = batadv_neigh_ifinfo_get(router_orig, |
391 | BATADV_IF_DEFAULT); | |
392 | if (!router_orig_tq) | |
393 | goto out; | |
394 | ||
395 | gw_tq_avg = router_gw_tq->bat_iv.tq_avg; | |
396 | orig_tq_avg = router_orig_tq->bat_iv.tq_avg; | |
c6c8fea2 SE |
397 | |
398 | /* the TQ value has to be better */ | |
399 | if (orig_tq_avg < gw_tq_avg) | |
5d02b3cd | 400 | goto out; |
c6c8fea2 | 401 | |
9cfc7bd6 | 402 | /* if the routing class is greater than 3 the value tells us how much |
c6c8fea2 | 403 | * greater the TQ value of the new gateway must be |
9cfc7bd6 | 404 | */ |
c6c8fea2 SE |
405 | if ((atomic_read(&bat_priv->gw_sel_class) > 3) && |
406 | (orig_tq_avg - gw_tq_avg < atomic_read(&bat_priv->gw_sel_class))) | |
5d02b3cd | 407 | goto out; |
c6c8fea2 | 408 | |
39c75a51 | 409 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
410 | "Restarting gateway selection: better gateway found (tq curr: %i, tq new: %i)\n", |
411 | gw_tq_avg, orig_tq_avg); | |
c6c8fea2 | 412 | |
4e820e72 AQ |
413 | reselect: |
414 | batadv_gw_reselect(bat_priv); | |
5d02b3cd | 415 | out: |
57f0c07c | 416 | if (curr_gw_orig) |
5d967310 | 417 | batadv_orig_node_put(curr_gw_orig); |
e1a5382f | 418 | if (router_gw) |
25bb2509 | 419 | batadv_neigh_node_put(router_gw); |
e1a5382f | 420 | if (router_orig) |
25bb2509 | 421 | batadv_neigh_node_put(router_orig); |
89652331 | 422 | if (router_gw_tq) |
044fa3ae | 423 | batadv_neigh_ifinfo_put(router_gw_tq); |
89652331 | 424 | if (router_orig_tq) |
044fa3ae | 425 | batadv_neigh_ifinfo_put(router_orig_tq); |
c6c8fea2 SE |
426 | } |
427 | ||
414254e3 ML |
428 | /** |
429 | * batadv_gw_node_add - add gateway node to list of available gateways | |
430 | * @bat_priv: the bat priv with all the soft interface information | |
431 | * @orig_node: originator announcing gateway capabilities | |
432 | * @gateway: announced bandwidth information | |
433 | */ | |
56303d34 SE |
434 | static void batadv_gw_node_add(struct batadv_priv *bat_priv, |
435 | struct batadv_orig_node *orig_node, | |
414254e3 | 436 | struct batadv_tvlv_gateway_data *gateway) |
c6c8fea2 | 437 | { |
56303d34 | 438 | struct batadv_gw_node *gw_node; |
414254e3 ML |
439 | |
440 | if (gateway->bandwidth_down == 0) | |
441 | return; | |
c6c8fea2 | 442 | |
704509b8 | 443 | gw_node = kzalloc(sizeof(*gw_node), GFP_ATOMIC); |
c3ba37a7 | 444 | if (!gw_node) |
c6c8fea2 SE |
445 | return; |
446 | ||
c3ba37a7 | 447 | kref_get(&orig_node->refcount); |
c6c8fea2 SE |
448 | INIT_HLIST_NODE(&gw_node->list); |
449 | gw_node->orig_node = orig_node; | |
27a4d5ef SW |
450 | gw_node->bandwidth_down = ntohl(gateway->bandwidth_down); |
451 | gw_node->bandwidth_up = ntohl(gateway->bandwidth_up); | |
e7aed321 | 452 | kref_init(&gw_node->refcount); |
c6c8fea2 | 453 | |
807736f6 SE |
454 | spin_lock_bh(&bat_priv->gw.list_lock); |
455 | hlist_add_head_rcu(&gw_node->list, &bat_priv->gw.list); | |
456 | spin_unlock_bh(&bat_priv->gw.list_lock); | |
c6c8fea2 | 457 | |
39c75a51 | 458 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
414254e3 ML |
459 | "Found new gateway %pM -> gw bandwidth: %u.%u/%u.%u MBit\n", |
460 | orig_node->orig, | |
461 | ntohl(gateway->bandwidth_down) / 10, | |
462 | ntohl(gateway->bandwidth_down) % 10, | |
463 | ntohl(gateway->bandwidth_up) / 10, | |
464 | ntohl(gateway->bandwidth_up) % 10); | |
c6c8fea2 SE |
465 | } |
466 | ||
414254e3 ML |
467 | /** |
468 | * batadv_gw_node_get - retrieve gateway node from list of available gateways | |
469 | * @bat_priv: the bat priv with all the soft interface information | |
470 | * @orig_node: originator announcing gateway capabilities | |
471 | * | |
62fe710f | 472 | * Return: gateway node if found or NULL otherwise. |
414254e3 ML |
473 | */ |
474 | static struct batadv_gw_node * | |
475 | batadv_gw_node_get(struct batadv_priv *bat_priv, | |
476 | struct batadv_orig_node *orig_node) | |
c6c8fea2 | 477 | { |
414254e3 | 478 | struct batadv_gw_node *gw_node_tmp, *gw_node = NULL; |
c6c8fea2 SE |
479 | |
480 | rcu_read_lock(); | |
414254e3 ML |
481 | hlist_for_each_entry_rcu(gw_node_tmp, &bat_priv->gw.list, list) { |
482 | if (gw_node_tmp->orig_node != orig_node) | |
c6c8fea2 SE |
483 | continue; |
484 | ||
e7aed321 | 485 | if (!kref_get_unless_zero(&gw_node_tmp->refcount)) |
414254e3 | 486 | continue; |
c6c8fea2 | 487 | |
414254e3 ML |
488 | gw_node = gw_node_tmp; |
489 | break; | |
490 | } | |
491 | rcu_read_unlock(); | |
c6c8fea2 | 492 | |
414254e3 ML |
493 | return gw_node; |
494 | } | |
c6c8fea2 | 495 | |
414254e3 ML |
496 | /** |
497 | * batadv_gw_node_update - update list of available gateways with changed | |
498 | * bandwidth information | |
499 | * @bat_priv: the bat priv with all the soft interface information | |
500 | * @orig_node: originator announcing gateway capabilities | |
501 | * @gateway: announced bandwidth information | |
502 | */ | |
503 | void batadv_gw_node_update(struct batadv_priv *bat_priv, | |
504 | struct batadv_orig_node *orig_node, | |
505 | struct batadv_tvlv_gateway_data *gateway) | |
506 | { | |
507 | struct batadv_gw_node *gw_node, *curr_gw = NULL; | |
508 | ||
509 | gw_node = batadv_gw_node_get(bat_priv, orig_node); | |
510 | if (!gw_node) { | |
511 | batadv_gw_node_add(bat_priv, orig_node, gateway); | |
512 | goto out; | |
c6c8fea2 | 513 | } |
c6c8fea2 | 514 | |
414254e3 ML |
515 | if ((gw_node->bandwidth_down == ntohl(gateway->bandwidth_down)) && |
516 | (gw_node->bandwidth_up == ntohl(gateway->bandwidth_up))) | |
517 | goto out; | |
c6c8fea2 | 518 | |
414254e3 ML |
519 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
520 | "Gateway bandwidth of originator %pM changed from %u.%u/%u.%u MBit to %u.%u/%u.%u MBit\n", | |
521 | orig_node->orig, | |
522 | gw_node->bandwidth_down / 10, | |
523 | gw_node->bandwidth_down % 10, | |
524 | gw_node->bandwidth_up / 10, | |
525 | gw_node->bandwidth_up % 10, | |
526 | ntohl(gateway->bandwidth_down) / 10, | |
527 | ntohl(gateway->bandwidth_down) % 10, | |
528 | ntohl(gateway->bandwidth_up) / 10, | |
529 | ntohl(gateway->bandwidth_up) % 10); | |
530 | ||
531 | gw_node->bandwidth_down = ntohl(gateway->bandwidth_down); | |
532 | gw_node->bandwidth_up = ntohl(gateway->bandwidth_up); | |
533 | ||
414254e3 | 534 | if (ntohl(gateway->bandwidth_down) == 0) { |
414254e3 ML |
535 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
536 | "Gateway %pM removed from gateway list\n", | |
537 | orig_node->orig); | |
c4aac1ab | 538 | |
414254e3 ML |
539 | /* Note: We don't need a NULL check here, since curr_gw never |
540 | * gets dereferenced. | |
541 | */ | |
bd3524c1 | 542 | spin_lock_bh(&bat_priv->gw.list_lock); |
c18bdd01 SE |
543 | if (!hlist_unhashed(&gw_node->list)) { |
544 | hlist_del_init_rcu(&gw_node->list); | |
3a01743d | 545 | batadv_gw_node_put(gw_node); |
c18bdd01 | 546 | } |
bd3524c1 SW |
547 | spin_unlock_bh(&bat_priv->gw.list_lock); |
548 | ||
414254e3 ML |
549 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
550 | if (gw_node == curr_gw) | |
4e820e72 | 551 | batadv_gw_reselect(bat_priv); |
bd3524c1 SW |
552 | |
553 | if (curr_gw) | |
3a01743d | 554 | batadv_gw_node_put(curr_gw); |
414254e3 | 555 | } |
71e4aa9c | 556 | |
414254e3 | 557 | out: |
414254e3 | 558 | if (gw_node) |
3a01743d | 559 | batadv_gw_node_put(gw_node); |
c6c8fea2 SE |
560 | } |
561 | ||
56303d34 SE |
562 | void batadv_gw_node_delete(struct batadv_priv *bat_priv, |
563 | struct batadv_orig_node *orig_node) | |
c6c8fea2 | 564 | { |
414254e3 ML |
565 | struct batadv_tvlv_gateway_data gateway; |
566 | ||
567 | gateway.bandwidth_down = 0; | |
568 | gateway.bandwidth_up = 0; | |
569 | ||
570 | batadv_gw_node_update(bat_priv, orig_node, &gateway); | |
c6c8fea2 SE |
571 | } |
572 | ||
bd3524c1 | 573 | void batadv_gw_node_free(struct batadv_priv *bat_priv) |
c6c8fea2 | 574 | { |
bd3524c1 | 575 | struct batadv_gw_node *gw_node; |
b67bfe0d | 576 | struct hlist_node *node_tmp; |
c6c8fea2 | 577 | |
807736f6 | 578 | spin_lock_bh(&bat_priv->gw.list_lock); |
b67bfe0d | 579 | hlist_for_each_entry_safe(gw_node, node_tmp, |
807736f6 | 580 | &bat_priv->gw.list, list) { |
bd3524c1 | 581 | hlist_del_init_rcu(&gw_node->list); |
3a01743d | 582 | batadv_gw_node_put(gw_node); |
c6c8fea2 | 583 | } |
807736f6 | 584 | spin_unlock_bh(&bat_priv->gw.list_lock); |
c6c8fea2 SE |
585 | } |
586 | ||
9cfc7bd6 | 587 | /* fails if orig_node has no router */ |
56303d34 SE |
588 | static int batadv_write_buffer_text(struct batadv_priv *bat_priv, |
589 | struct seq_file *seq, | |
590 | const struct batadv_gw_node *gw_node) | |
c6c8fea2 | 591 | { |
56303d34 SE |
592 | struct batadv_gw_node *curr_gw; |
593 | struct batadv_neigh_node *router; | |
89652331 | 594 | struct batadv_neigh_ifinfo *router_ifinfo = NULL; |
414254e3 | 595 | int ret = -1; |
c6c8fea2 | 596 | |
7351a482 | 597 | router = batadv_orig_router_get(gw_node->orig_node, BATADV_IF_DEFAULT); |
e1a5382f LL |
598 | if (!router) |
599 | goto out; | |
5d02b3cd | 600 | |
89652331 SW |
601 | router_ifinfo = batadv_neigh_ifinfo_get(router, BATADV_IF_DEFAULT); |
602 | if (!router_ifinfo) | |
603 | goto out; | |
604 | ||
1409a834 | 605 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
5d02b3cd | 606 | |
6d91147d JP |
607 | seq_printf(seq, "%s %pM (%3i) %pM [%10s]: %u.%u/%u.%u MBit\n", |
608 | (curr_gw == gw_node ? "=>" : " "), | |
609 | gw_node->orig_node->orig, | |
610 | router_ifinfo->bat_iv.tq_avg, router->addr, | |
611 | router->if_incoming->net_dev->name, | |
612 | gw_node->bandwidth_down / 10, | |
613 | gw_node->bandwidth_down % 10, | |
614 | gw_node->bandwidth_up / 10, | |
615 | gw_node->bandwidth_up % 10); | |
92b83917 | 616 | ret = seq_has_overflowed(seq) ? -1 : 0; |
5d02b3cd | 617 | |
c4aac1ab | 618 | if (curr_gw) |
3a01743d | 619 | batadv_gw_node_put(curr_gw); |
e1a5382f | 620 | out: |
89652331 | 621 | if (router_ifinfo) |
044fa3ae | 622 | batadv_neigh_ifinfo_put(router_ifinfo); |
89652331 | 623 | if (router) |
25bb2509 | 624 | batadv_neigh_node_put(router); |
5d02b3cd | 625 | return ret; |
c6c8fea2 SE |
626 | } |
627 | ||
7cf06bc6 | 628 | int batadv_gw_client_seq_print_text(struct seq_file *seq, void *offset) |
c6c8fea2 SE |
629 | { |
630 | struct net_device *net_dev = (struct net_device *)seq->private; | |
56303d34 SE |
631 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
632 | struct batadv_hard_iface *primary_if; | |
633 | struct batadv_gw_node *gw_node; | |
30da63a6 | 634 | int gw_count = 0; |
c6c8fea2 | 635 | |
30da63a6 ML |
636 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
637 | if (!primary_if) | |
32ae9b22 | 638 | goto out; |
c6c8fea2 | 639 | |
86ceb360 | 640 | seq_printf(seq, |
414254e3 | 641 | " %-12s (%s/%i) %17s [%10s]: advertised uplink bandwidth ... [B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s)]\n", |
42d0b044 SE |
642 | "Gateway", "#", BATADV_TQ_MAX_VALUE, "Nexthop", "outgoingIF", |
643 | BATADV_SOURCE_VERSION, primary_if->net_dev->name, | |
32ae9b22 | 644 | primary_if->net_dev->dev_addr, net_dev->name); |
c6c8fea2 SE |
645 | |
646 | rcu_read_lock(); | |
b67bfe0d | 647 | hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.list, list) { |
e1a5382f | 648 | /* fails if orig_node has no router */ |
1409a834 | 649 | if (batadv_write_buffer_text(bat_priv, seq, gw_node) < 0) |
c6c8fea2 SE |
650 | continue; |
651 | ||
c6c8fea2 SE |
652 | gw_count++; |
653 | } | |
654 | rcu_read_unlock(); | |
655 | ||
656 | if (gw_count == 0) | |
0c814653 | 657 | seq_puts(seq, "No gateways in range ...\n"); |
c6c8fea2 | 658 | |
32ae9b22 ML |
659 | out: |
660 | if (primary_if) | |
82047ad7 | 661 | batadv_hardif_put(primary_if); |
30da63a6 | 662 | return 0; |
c6c8fea2 SE |
663 | } |
664 | ||
6c413b1c AQ |
665 | /** |
666 | * batadv_gw_dhcp_recipient_get - check if a packet is a DHCP message | |
667 | * @skb: the packet to check | |
668 | * @header_len: a pointer to the batman-adv header size | |
669 | * @chaddr: buffer where the client address will be stored. Valid | |
670 | * only if the function returns BATADV_DHCP_TO_CLIENT | |
671 | * | |
62fe710f SE |
672 | * This function may re-allocate the data buffer of the skb passed as argument. |
673 | * | |
674 | * Return: | |
6c413b1c AQ |
675 | * - BATADV_DHCP_NO if the packet is not a dhcp message or if there was an error |
676 | * while parsing it | |
677 | * - BATADV_DHCP_TO_SERVER if this is a message going to the DHCP server | |
678 | * - BATADV_DHCP_TO_CLIENT if this is a message going to a DHCP client | |
6c413b1c AQ |
679 | */ |
680 | enum batadv_dhcp_recipient | |
681 | batadv_gw_dhcp_recipient_get(struct sk_buff *skb, unsigned int *header_len, | |
6b5e971a | 682 | u8 *chaddr) |
c6c8fea2 | 683 | { |
6c413b1c | 684 | enum batadv_dhcp_recipient ret = BATADV_DHCP_NO; |
c6c8fea2 SE |
685 | struct ethhdr *ethhdr; |
686 | struct iphdr *iphdr; | |
687 | struct ipv6hdr *ipv6hdr; | |
688 | struct udphdr *udphdr; | |
f7f8ed56 | 689 | struct vlan_ethhdr *vhdr; |
6c413b1c | 690 | int chaddr_offset; |
f7f8ed56 | 691 | __be16 proto; |
6b5e971a | 692 | u8 *p; |
c6c8fea2 SE |
693 | |
694 | /* check for ethernet header */ | |
be7af5cf | 695 | if (!pskb_may_pull(skb, *header_len + ETH_HLEN)) |
6c413b1c AQ |
696 | return BATADV_DHCP_NO; |
697 | ||
927c2ed7 | 698 | ethhdr = eth_hdr(skb); |
f7f8ed56 | 699 | proto = ethhdr->h_proto; |
be7af5cf | 700 | *header_len += ETH_HLEN; |
c6c8fea2 SE |
701 | |
702 | /* check for initial vlan header */ | |
f7f8ed56 | 703 | if (proto == htons(ETH_P_8021Q)) { |
be7af5cf | 704 | if (!pskb_may_pull(skb, *header_len + VLAN_HLEN)) |
6c413b1c | 705 | return BATADV_DHCP_NO; |
f7f8ed56 | 706 | |
927c2ed7 | 707 | vhdr = vlan_eth_hdr(skb); |
f7f8ed56 | 708 | proto = vhdr->h_vlan_encapsulated_proto; |
be7af5cf | 709 | *header_len += VLAN_HLEN; |
c6c8fea2 SE |
710 | } |
711 | ||
712 | /* check for ip header */ | |
f7f8ed56 AQ |
713 | switch (proto) { |
714 | case htons(ETH_P_IP): | |
be7af5cf | 715 | if (!pskb_may_pull(skb, *header_len + sizeof(*iphdr))) |
6c413b1c AQ |
716 | return BATADV_DHCP_NO; |
717 | ||
be7af5cf ML |
718 | iphdr = (struct iphdr *)(skb->data + *header_len); |
719 | *header_len += iphdr->ihl * 4; | |
c6c8fea2 SE |
720 | |
721 | /* check for udp header */ | |
722 | if (iphdr->protocol != IPPROTO_UDP) | |
6c413b1c | 723 | return BATADV_DHCP_NO; |
c6c8fea2 SE |
724 | |
725 | break; | |
f7f8ed56 | 726 | case htons(ETH_P_IPV6): |
be7af5cf | 727 | if (!pskb_may_pull(skb, *header_len + sizeof(*ipv6hdr))) |
6c413b1c AQ |
728 | return BATADV_DHCP_NO; |
729 | ||
be7af5cf ML |
730 | ipv6hdr = (struct ipv6hdr *)(skb->data + *header_len); |
731 | *header_len += sizeof(*ipv6hdr); | |
c6c8fea2 SE |
732 | |
733 | /* check for udp header */ | |
734 | if (ipv6hdr->nexthdr != IPPROTO_UDP) | |
6c413b1c | 735 | return BATADV_DHCP_NO; |
c6c8fea2 SE |
736 | |
737 | break; | |
738 | default: | |
6c413b1c | 739 | return BATADV_DHCP_NO; |
c6c8fea2 SE |
740 | } |
741 | ||
be7af5cf | 742 | if (!pskb_may_pull(skb, *header_len + sizeof(*udphdr))) |
6c413b1c | 743 | return BATADV_DHCP_NO; |
9d2c9488 | 744 | |
be7af5cf ML |
745 | udphdr = (struct udphdr *)(skb->data + *header_len); |
746 | *header_len += sizeof(*udphdr); | |
c6c8fea2 SE |
747 | |
748 | /* check for bootp port */ | |
6c413b1c AQ |
749 | switch (proto) { |
750 | case htons(ETH_P_IP): | |
751 | if (udphdr->dest == htons(67)) | |
752 | ret = BATADV_DHCP_TO_SERVER; | |
753 | else if (udphdr->source == htons(67)) | |
754 | ret = BATADV_DHCP_TO_CLIENT; | |
755 | break; | |
756 | case htons(ETH_P_IPV6): | |
757 | if (udphdr->dest == htons(547)) | |
758 | ret = BATADV_DHCP_TO_SERVER; | |
759 | else if (udphdr->source == htons(547)) | |
760 | ret = BATADV_DHCP_TO_CLIENT; | |
761 | break; | |
762 | } | |
c6c8fea2 | 763 | |
6c413b1c AQ |
764 | chaddr_offset = *header_len + BATADV_DHCP_CHADDR_OFFSET; |
765 | /* store the client address if the message is going to a client */ | |
766 | if (ret == BATADV_DHCP_TO_CLIENT && | |
767 | pskb_may_pull(skb, chaddr_offset + ETH_ALEN)) { | |
768 | /* check if the DHCP packet carries an Ethernet DHCP */ | |
769 | p = skb->data + *header_len + BATADV_DHCP_HTYPE_OFFSET; | |
770 | if (*p != BATADV_DHCP_HTYPE_ETHERNET) | |
771 | return BATADV_DHCP_NO; | |
772 | ||
773 | /* check if the DHCP packet carries a valid Ethernet address */ | |
774 | p = skb->data + *header_len + BATADV_DHCP_HLEN_OFFSET; | |
775 | if (*p != ETH_ALEN) | |
776 | return BATADV_DHCP_NO; | |
777 | ||
8fdd0153 | 778 | ether_addr_copy(chaddr, skb->data + chaddr_offset); |
6c413b1c | 779 | } |
c6c8fea2 | 780 | |
6c413b1c | 781 | return ret; |
be7af5cf | 782 | } |
aa143d28 | 783 | |
bbb877ed AQ |
784 | /** |
785 | * batadv_gw_out_of_range - check if the dhcp request destination is the best gw | |
786 | * @bat_priv: the bat priv with all the soft interface information | |
787 | * @skb: the outgoing packet | |
788 | * | |
789 | * Check if the skb is a DHCP request and if it is sent to the current best GW | |
790 | * server. Due to topology changes it may be the case that the GW server | |
791 | * previously selected is not the best one anymore. | |
792 | * | |
bbb877ed | 793 | * This call might reallocate skb data. |
6c413b1c | 794 | * Must be invoked only when the DHCP packet is going TO a DHCP SERVER. |
62fe710f SE |
795 | * |
796 | * Return: true if the packet destination is unicast and it is not the best gw, | |
797 | * false otherwise. | |
bbb877ed | 798 | */ |
56303d34 | 799 | bool batadv_gw_out_of_range(struct batadv_priv *bat_priv, |
9d2c9488 | 800 | struct sk_buff *skb) |
be7af5cf | 801 | { |
4f248cff SE |
802 | struct batadv_neigh_node *neigh_curr = NULL; |
803 | struct batadv_neigh_node *neigh_old = NULL; | |
56303d34 | 804 | struct batadv_orig_node *orig_dst_node = NULL; |
4f248cff SE |
805 | struct batadv_gw_node *gw_node = NULL; |
806 | struct batadv_gw_node *curr_gw = NULL; | |
89652331 | 807 | struct batadv_neigh_ifinfo *curr_ifinfo, *old_ifinfo; |
6c413b1c AQ |
808 | struct ethhdr *ethhdr = (struct ethhdr *)skb->data; |
809 | bool out_of_range = false; | |
6b5e971a | 810 | u8 curr_tq_avg; |
bbb877ed AQ |
811 | unsigned short vid; |
812 | ||
813 | vid = batadv_get_vid(skb, 0); | |
be7af5cf | 814 | |
08c36d3e | 815 | orig_dst_node = batadv_transtable_search(bat_priv, ethhdr->h_source, |
bbb877ed | 816 | ethhdr->h_dest, vid); |
be7af5cf ML |
817 | if (!orig_dst_node) |
818 | goto out; | |
819 | ||
414254e3 | 820 | gw_node = batadv_gw_node_get(bat_priv, orig_dst_node); |
0d164491 | 821 | if (!gw_node) |
be7af5cf ML |
822 | goto out; |
823 | ||
be7af5cf | 824 | switch (atomic_read(&bat_priv->gw_mode)) { |
cd646ab1 | 825 | case BATADV_GW_MODE_SERVER: |
be7af5cf | 826 | /* If we are a GW then we are our best GW. We can artificially |
9cfc7bd6 SE |
827 | * set the tq towards ourself as the maximum value |
828 | */ | |
42d0b044 | 829 | curr_tq_avg = BATADV_TQ_MAX_VALUE; |
be7af5cf | 830 | break; |
cd646ab1 | 831 | case BATADV_GW_MODE_CLIENT: |
1409a834 | 832 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
be7af5cf ML |
833 | if (!curr_gw) |
834 | goto out; | |
835 | ||
836 | /* packet is going to our gateway */ | |
837 | if (curr_gw->orig_node == orig_dst_node) | |
838 | goto out; | |
839 | ||
840 | /* If the dhcp packet has been sent to a different gw, | |
841 | * we have to evaluate whether the old gw is still | |
9cfc7bd6 SE |
842 | * reliable enough |
843 | */ | |
30d3c511 SE |
844 | neigh_curr = batadv_find_router(bat_priv, curr_gw->orig_node, |
845 | NULL); | |
be7af5cf ML |
846 | if (!neigh_curr) |
847 | goto out; | |
848 | ||
89652331 SW |
849 | curr_ifinfo = batadv_neigh_ifinfo_get(neigh_curr, |
850 | BATADV_IF_DEFAULT); | |
851 | if (!curr_ifinfo) | |
852 | goto out; | |
853 | ||
854 | curr_tq_avg = curr_ifinfo->bat_iv.tq_avg; | |
044fa3ae | 855 | batadv_neigh_ifinfo_put(curr_ifinfo); |
89652331 | 856 | |
be7af5cf | 857 | break; |
cd646ab1 | 858 | case BATADV_GW_MODE_OFF: |
be7af5cf ML |
859 | default: |
860 | goto out; | |
43676ab5 | 861 | } |
be7af5cf | 862 | |
30d3c511 | 863 | neigh_old = batadv_find_router(bat_priv, orig_dst_node, NULL); |
2ef04f47 | 864 | if (!neigh_old) |
be7af5cf ML |
865 | goto out; |
866 | ||
89652331 SW |
867 | old_ifinfo = batadv_neigh_ifinfo_get(neigh_old, BATADV_IF_DEFAULT); |
868 | if (!old_ifinfo) | |
869 | goto out; | |
870 | ||
871 | if ((curr_tq_avg - old_ifinfo->bat_iv.tq_avg) > BATADV_GW_THRESHOLD) | |
be7af5cf | 872 | out_of_range = true; |
044fa3ae | 873 | batadv_neigh_ifinfo_put(old_ifinfo); |
be7af5cf ML |
874 | |
875 | out: | |
876 | if (orig_dst_node) | |
5d967310 | 877 | batadv_orig_node_put(orig_dst_node); |
be7af5cf | 878 | if (curr_gw) |
3a01743d | 879 | batadv_gw_node_put(curr_gw); |
414254e3 | 880 | if (gw_node) |
3a01743d | 881 | batadv_gw_node_put(gw_node); |
43676ab5 | 882 | if (neigh_old) |
25bb2509 | 883 | batadv_neigh_node_put(neigh_old); |
43676ab5 | 884 | if (neigh_curr) |
25bb2509 | 885 | batadv_neigh_node_put(neigh_curr); |
be7af5cf | 886 | return out_of_range; |
c6c8fea2 | 887 | } |