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e19f9759 | 1 | /* Copyright (C) 2009-2014 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 | ||
18 | #include "main.h" | |
b706b13b | 19 | #include "sysfs.h" |
c6c8fea2 SE |
20 | #include "gateway_client.h" |
21 | #include "gateway_common.h" | |
22 | #include "hard-interface.h" | |
57f0c07c | 23 | #include "originator.h" |
be7af5cf | 24 | #include "translation-table.h" |
43676ab5 | 25 | #include "routing.h" |
c6c8fea2 SE |
26 | #include <linux/ip.h> |
27 | #include <linux/ipv6.h> | |
28 | #include <linux/udp.h> | |
29 | #include <linux/if_vlan.h> | |
30 | ||
6c413b1c AQ |
31 | /* These are the offsets of the "hw type" and "hw address length" in the dhcp |
32 | * packet starting at the beginning of the dhcp header | |
9cfc7bd6 | 33 | */ |
6c413b1c AQ |
34 | #define BATADV_DHCP_HTYPE_OFFSET 1 |
35 | #define BATADV_DHCP_HLEN_OFFSET 2 | |
36 | /* Value of htype representing Ethernet */ | |
37 | #define BATADV_DHCP_HTYPE_ETHERNET 0x01 | |
38 | /* This is the offset of the "chaddr" field in the dhcp packet starting at the | |
39 | * beginning of the dhcp header | |
40 | */ | |
41 | #define BATADV_DHCP_CHADDR_OFFSET 28 | |
43676ab5 | 42 | |
56303d34 | 43 | static void batadv_gw_node_free_ref(struct batadv_gw_node *gw_node) |
c6c8fea2 | 44 | { |
377fe0f9 AQ |
45 | if (atomic_dec_and_test(&gw_node->refcount)) { |
46 | batadv_orig_node_free_ref(gw_node->orig_node); | |
eb340b2f | 47 | kfree_rcu(gw_node, rcu); |
377fe0f9 | 48 | } |
c6c8fea2 SE |
49 | } |
50 | ||
56303d34 SE |
51 | static struct batadv_gw_node * |
52 | batadv_gw_get_selected_gw_node(struct batadv_priv *bat_priv) | |
c6c8fea2 | 53 | { |
56303d34 | 54 | struct batadv_gw_node *gw_node; |
c6c8fea2 | 55 | |
5d02b3cd | 56 | rcu_read_lock(); |
807736f6 | 57 | gw_node = rcu_dereference(bat_priv->gw.curr_gw); |
c4aac1ab | 58 | if (!gw_node) |
7b36e8ee | 59 | goto out; |
c6c8fea2 | 60 | |
c4aac1ab ML |
61 | if (!atomic_inc_not_zero(&gw_node->refcount)) |
62 | gw_node = NULL; | |
43c70ad5 | 63 | |
5d02b3cd LL |
64 | out: |
65 | rcu_read_unlock(); | |
c4aac1ab | 66 | return gw_node; |
c6c8fea2 SE |
67 | } |
68 | ||
56303d34 SE |
69 | struct batadv_orig_node * |
70 | batadv_gw_get_selected_orig(struct batadv_priv *bat_priv) | |
c6c8fea2 | 71 | { |
56303d34 SE |
72 | struct batadv_gw_node *gw_node; |
73 | struct batadv_orig_node *orig_node = NULL; | |
c6c8fea2 | 74 | |
1409a834 | 75 | gw_node = batadv_gw_get_selected_gw_node(bat_priv); |
c4aac1ab ML |
76 | if (!gw_node) |
77 | goto out; | |
78 | ||
79 | rcu_read_lock(); | |
80 | orig_node = gw_node->orig_node; | |
81 | if (!orig_node) | |
82 | goto unlock; | |
83 | ||
84 | if (!atomic_inc_not_zero(&orig_node->refcount)) | |
85 | orig_node = NULL; | |
c6c8fea2 | 86 | |
c4aac1ab ML |
87 | unlock: |
88 | rcu_read_unlock(); | |
89 | out: | |
c6c8fea2 | 90 | if (gw_node) |
1409a834 | 91 | batadv_gw_node_free_ref(gw_node); |
c4aac1ab | 92 | return orig_node; |
c6c8fea2 SE |
93 | } |
94 | ||
56303d34 SE |
95 | static void batadv_gw_select(struct batadv_priv *bat_priv, |
96 | struct batadv_gw_node *new_gw_node) | |
c6c8fea2 | 97 | { |
56303d34 | 98 | struct batadv_gw_node *curr_gw_node; |
c6c8fea2 | 99 | |
807736f6 | 100 | spin_lock_bh(&bat_priv->gw.list_lock); |
c4aac1ab | 101 | |
25b6d3c1 ML |
102 | if (new_gw_node && !atomic_inc_not_zero(&new_gw_node->refcount)) |
103 | new_gw_node = NULL; | |
c6c8fea2 | 104 | |
807736f6 SE |
105 | curr_gw_node = rcu_dereference_protected(bat_priv->gw.curr_gw, 1); |
106 | rcu_assign_pointer(bat_priv->gw.curr_gw, new_gw_node); | |
25b6d3c1 ML |
107 | |
108 | if (curr_gw_node) | |
1409a834 | 109 | batadv_gw_node_free_ref(curr_gw_node); |
c4aac1ab | 110 | |
807736f6 | 111 | spin_unlock_bh(&bat_priv->gw.list_lock); |
c4aac1ab ML |
112 | } |
113 | ||
4e820e72 AQ |
114 | /** |
115 | * batadv_gw_reselect - force a gateway reselection | |
116 | * @bat_priv: the bat priv with all the soft interface information | |
117 | * | |
118 | * Set a flag to remind the GW component to perform a new gateway reselection. | |
119 | * However this function does not ensure that the current gateway is going to be | |
120 | * deselected. The reselection mechanism may elect the same gateway once again. | |
121 | * | |
122 | * This means that invoking batadv_gw_reselect() does not guarantee a gateway | |
123 | * change and therefore a uevent is not necessarily expected. | |
124 | */ | |
125 | void batadv_gw_reselect(struct batadv_priv *bat_priv) | |
c4aac1ab | 126 | { |
807736f6 | 127 | atomic_set(&bat_priv->gw.reselect, 1); |
c6c8fea2 SE |
128 | } |
129 | ||
56303d34 SE |
130 | static struct batadv_gw_node * |
131 | batadv_gw_get_best_gw_node(struct batadv_priv *bat_priv) | |
c6c8fea2 | 132 | { |
56303d34 | 133 | struct batadv_neigh_node *router; |
89652331 | 134 | struct batadv_neigh_ifinfo *router_ifinfo; |
56303d34 | 135 | struct batadv_gw_node *gw_node, *curr_gw = NULL; |
c6c8fea2 | 136 | uint32_t max_gw_factor = 0, tmp_gw_factor = 0; |
c67893d1 | 137 | uint32_t gw_divisor; |
2265c141 | 138 | uint8_t max_tq = 0; |
c67893d1 | 139 | uint8_t tq_avg; |
56303d34 | 140 | struct batadv_orig_node *orig_node; |
c6c8fea2 | 141 | |
c67893d1 SE |
142 | gw_divisor = BATADV_TQ_LOCAL_WINDOW_SIZE * BATADV_TQ_LOCAL_WINDOW_SIZE; |
143 | gw_divisor *= 64; | |
144 | ||
c4aac1ab | 145 | rcu_read_lock(); |
b67bfe0d | 146 | hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.list, list) { |
e1a5382f | 147 | if (gw_node->deleted) |
c6c8fea2 SE |
148 | continue; |
149 | ||
84d5e5e0 | 150 | orig_node = gw_node->orig_node; |
7351a482 | 151 | router = batadv_orig_router_get(orig_node, BATADV_IF_DEFAULT); |
e1a5382f | 152 | if (!router) |
c6c8fea2 SE |
153 | continue; |
154 | ||
89652331 SW |
155 | router_ifinfo = batadv_neigh_ifinfo_get(router, |
156 | BATADV_IF_DEFAULT); | |
157 | if (!router_ifinfo) | |
158 | goto next; | |
159 | ||
2265c141 AQ |
160 | if (!atomic_inc_not_zero(&gw_node->refcount)) |
161 | goto next; | |
162 | ||
89652331 | 163 | tq_avg = router_ifinfo->bat_iv.tq_avg; |
c67893d1 | 164 | |
c6c8fea2 SE |
165 | switch (atomic_read(&bat_priv->gw_sel_class)) { |
166 | case 1: /* fast connection */ | |
414254e3 ML |
167 | tmp_gw_factor = tq_avg * tq_avg; |
168 | tmp_gw_factor *= gw_node->bandwidth_down; | |
169 | tmp_gw_factor *= 100 * 100; | |
c67893d1 | 170 | tmp_gw_factor /= gw_divisor; |
c6c8fea2 SE |
171 | |
172 | if ((tmp_gw_factor > max_gw_factor) || | |
173 | ((tmp_gw_factor == max_gw_factor) && | |
c67893d1 | 174 | (tq_avg > max_tq))) { |
2265c141 | 175 | if (curr_gw) |
1409a834 | 176 | batadv_gw_node_free_ref(curr_gw); |
2265c141 AQ |
177 | curr_gw = gw_node; |
178 | atomic_inc(&curr_gw->refcount); | |
179 | } | |
c6c8fea2 SE |
180 | break; |
181 | ||
9cfc7bd6 | 182 | default: /* 2: stable connection (use best statistic) |
c6c8fea2 SE |
183 | * 3: fast-switch (use best statistic but change as |
184 | * soon as a better gateway appears) | |
185 | * XX: late-switch (use best statistic but change as | |
186 | * soon as a better gateway appears which has | |
187 | * $routing_class more tq points) | |
9cfc7bd6 | 188 | */ |
c67893d1 | 189 | if (tq_avg > max_tq) { |
2265c141 | 190 | if (curr_gw) |
1409a834 | 191 | batadv_gw_node_free_ref(curr_gw); |
2265c141 AQ |
192 | curr_gw = gw_node; |
193 | atomic_inc(&curr_gw->refcount); | |
194 | } | |
c6c8fea2 SE |
195 | break; |
196 | } | |
197 | ||
c67893d1 SE |
198 | if (tq_avg > max_tq) |
199 | max_tq = tq_avg; | |
c6c8fea2 SE |
200 | |
201 | if (tmp_gw_factor > max_gw_factor) | |
202 | max_gw_factor = tmp_gw_factor; | |
e1a5382f | 203 | |
1409a834 | 204 | batadv_gw_node_free_ref(gw_node); |
2265c141 AQ |
205 | |
206 | next: | |
7d211efc | 207 | batadv_neigh_node_free_ref(router); |
89652331 SW |
208 | if (router_ifinfo) |
209 | batadv_neigh_ifinfo_free_ref(router_ifinfo); | |
c6c8fea2 | 210 | } |
2265c141 | 211 | rcu_read_unlock(); |
c6c8fea2 | 212 | |
2265c141 AQ |
213 | return curr_gw; |
214 | } | |
c6c8fea2 | 215 | |
c6eaa3f0 AQ |
216 | /** |
217 | * batadv_gw_check_client_stop - check if client mode has been switched off | |
218 | * @bat_priv: the bat priv with all the soft interface information | |
219 | * | |
220 | * This function assumes the caller has checked that the gw state *is actually | |
221 | * changing*. This function is not supposed to be called when there is no state | |
222 | * change. | |
223 | */ | |
224 | void batadv_gw_check_client_stop(struct batadv_priv *bat_priv) | |
225 | { | |
226 | struct batadv_gw_node *curr_gw; | |
227 | ||
228 | if (atomic_read(&bat_priv->gw_mode) != BATADV_GW_MODE_CLIENT) | |
229 | return; | |
230 | ||
231 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); | |
232 | if (!curr_gw) | |
233 | return; | |
234 | ||
f3163181 AQ |
235 | /* deselect the current gateway so that next time that client mode is |
236 | * enabled a proper GW_ADD event can be sent | |
237 | */ | |
238 | batadv_gw_select(bat_priv, NULL); | |
239 | ||
c6eaa3f0 AQ |
240 | /* if batman-adv is switching the gw client mode off and a gateway was |
241 | * already selected, send a DEL uevent | |
242 | */ | |
243 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL, NULL); | |
244 | ||
245 | batadv_gw_node_free_ref(curr_gw); | |
246 | } | |
247 | ||
56303d34 | 248 | void batadv_gw_election(struct batadv_priv *bat_priv) |
2265c141 | 249 | { |
56303d34 SE |
250 | struct batadv_gw_node *curr_gw = NULL, *next_gw = NULL; |
251 | struct batadv_neigh_node *router = NULL; | |
89652331 | 252 | struct batadv_neigh_ifinfo *router_ifinfo = NULL; |
19595e05 | 253 | char gw_addr[18] = { '\0' }; |
2265c141 | 254 | |
cd646ab1 | 255 | if (atomic_read(&bat_priv->gw_mode) != BATADV_GW_MODE_CLIENT) |
2265c141 AQ |
256 | goto out; |
257 | ||
1409a834 | 258 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
2265c141 | 259 | |
807736f6 | 260 | if (!batadv_atomic_dec_not_zero(&bat_priv->gw.reselect) && curr_gw) |
caa0bf64 ML |
261 | goto out; |
262 | ||
1409a834 | 263 | next_gw = batadv_gw_get_best_gw_node(bat_priv); |
2265c141 AQ |
264 | |
265 | if (curr_gw == next_gw) | |
266 | goto out; | |
267 | ||
268 | if (next_gw) { | |
19595e05 AQ |
269 | sprintf(gw_addr, "%pM", next_gw->orig_node->orig); |
270 | ||
7351a482 SW |
271 | router = batadv_orig_router_get(next_gw->orig_node, |
272 | BATADV_IF_DEFAULT); | |
2265c141 | 273 | if (!router) { |
4e820e72 | 274 | batadv_gw_reselect(bat_priv); |
2265c141 AQ |
275 | goto out; |
276 | } | |
89652331 SW |
277 | |
278 | router_ifinfo = batadv_neigh_ifinfo_get(router, | |
279 | BATADV_IF_DEFAULT); | |
280 | if (!router_ifinfo) { | |
281 | batadv_gw_reselect(bat_priv); | |
282 | goto out; | |
283 | } | |
c6c8fea2 SE |
284 | } |
285 | ||
2265c141 | 286 | if ((curr_gw) && (!next_gw)) { |
39c75a51 | 287 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 288 | "Removing selected gateway - no gateway in range\n"); |
39c75a51 SE |
289 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL, |
290 | NULL); | |
2265c141 | 291 | } else if ((!curr_gw) && (next_gw)) { |
39c75a51 | 292 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
414254e3 | 293 | "Adding route to gateway %pM (bandwidth: %u.%u/%u.%u MBit, tq: %i)\n", |
1eda58bf | 294 | next_gw->orig_node->orig, |
414254e3 ML |
295 | next_gw->bandwidth_down / 10, |
296 | next_gw->bandwidth_down % 10, | |
297 | next_gw->bandwidth_up / 10, | |
89652331 SW |
298 | next_gw->bandwidth_up % 10, |
299 | router_ifinfo->bat_iv.tq_avg); | |
39c75a51 SE |
300 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_ADD, |
301 | gw_addr); | |
2265c141 | 302 | } else { |
39c75a51 | 303 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
414254e3 | 304 | "Changing route to gateway %pM (bandwidth: %u.%u/%u.%u MBit, tq: %i)\n", |
1eda58bf | 305 | next_gw->orig_node->orig, |
414254e3 ML |
306 | next_gw->bandwidth_down / 10, |
307 | next_gw->bandwidth_down % 10, | |
308 | next_gw->bandwidth_up / 10, | |
89652331 SW |
309 | next_gw->bandwidth_up % 10, |
310 | router_ifinfo->bat_iv.tq_avg); | |
39c75a51 SE |
311 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_CHANGE, |
312 | gw_addr); | |
2265c141 AQ |
313 | } |
314 | ||
1409a834 | 315 | batadv_gw_select(bat_priv, next_gw); |
2265c141 | 316 | |
c4aac1ab ML |
317 | out: |
318 | if (curr_gw) | |
1409a834 | 319 | batadv_gw_node_free_ref(curr_gw); |
2265c141 | 320 | if (next_gw) |
1409a834 | 321 | batadv_gw_node_free_ref(next_gw); |
2265c141 | 322 | if (router) |
7d211efc | 323 | batadv_neigh_node_free_ref(router); |
89652331 SW |
324 | if (router_ifinfo) |
325 | batadv_neigh_ifinfo_free_ref(router_ifinfo); | |
c6c8fea2 SE |
326 | } |
327 | ||
56303d34 SE |
328 | void batadv_gw_check_election(struct batadv_priv *bat_priv, |
329 | struct batadv_orig_node *orig_node) | |
c6c8fea2 | 330 | { |
89652331 SW |
331 | struct batadv_neigh_ifinfo *router_orig_tq = NULL; |
332 | struct batadv_neigh_ifinfo *router_gw_tq = NULL; | |
56303d34 SE |
333 | struct batadv_orig_node *curr_gw_orig; |
334 | struct batadv_neigh_node *router_gw = NULL, *router_orig = NULL; | |
c6c8fea2 SE |
335 | uint8_t gw_tq_avg, orig_tq_avg; |
336 | ||
7cf06bc6 | 337 | curr_gw_orig = batadv_gw_get_selected_orig(bat_priv); |
57f0c07c | 338 | if (!curr_gw_orig) |
4e820e72 | 339 | goto reselect; |
c6c8fea2 | 340 | |
7351a482 | 341 | router_gw = batadv_orig_router_get(curr_gw_orig, BATADV_IF_DEFAULT); |
e1a5382f | 342 | if (!router_gw) |
4e820e72 | 343 | goto reselect; |
c6c8fea2 | 344 | |
89652331 SW |
345 | router_gw_tq = batadv_neigh_ifinfo_get(router_gw, |
346 | BATADV_IF_DEFAULT); | |
347 | if (!router_gw_tq) | |
348 | goto reselect; | |
349 | ||
c6c8fea2 | 350 | /* this node already is the gateway */ |
57f0c07c | 351 | if (curr_gw_orig == orig_node) |
e1a5382f | 352 | goto out; |
c6c8fea2 | 353 | |
7351a482 | 354 | router_orig = batadv_orig_router_get(orig_node, BATADV_IF_DEFAULT); |
e1a5382f LL |
355 | if (!router_orig) |
356 | goto out; | |
5d02b3cd | 357 | |
89652331 SW |
358 | router_orig_tq = batadv_neigh_ifinfo_get(router_orig, |
359 | BATADV_IF_DEFAULT); | |
360 | if (!router_orig_tq) | |
361 | goto out; | |
362 | ||
363 | gw_tq_avg = router_gw_tq->bat_iv.tq_avg; | |
364 | orig_tq_avg = router_orig_tq->bat_iv.tq_avg; | |
c6c8fea2 SE |
365 | |
366 | /* the TQ value has to be better */ | |
367 | if (orig_tq_avg < gw_tq_avg) | |
5d02b3cd | 368 | goto out; |
c6c8fea2 | 369 | |
9cfc7bd6 | 370 | /* if the routing class is greater than 3 the value tells us how much |
c6c8fea2 | 371 | * greater the TQ value of the new gateway must be |
9cfc7bd6 | 372 | */ |
c6c8fea2 SE |
373 | if ((atomic_read(&bat_priv->gw_sel_class) > 3) && |
374 | (orig_tq_avg - gw_tq_avg < atomic_read(&bat_priv->gw_sel_class))) | |
5d02b3cd | 375 | goto out; |
c6c8fea2 | 376 | |
39c75a51 | 377 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
378 | "Restarting gateway selection: better gateway found (tq curr: %i, tq new: %i)\n", |
379 | gw_tq_avg, orig_tq_avg); | |
c6c8fea2 | 380 | |
4e820e72 AQ |
381 | reselect: |
382 | batadv_gw_reselect(bat_priv); | |
5d02b3cd | 383 | out: |
57f0c07c | 384 | if (curr_gw_orig) |
7d211efc | 385 | batadv_orig_node_free_ref(curr_gw_orig); |
e1a5382f | 386 | if (router_gw) |
7d211efc | 387 | batadv_neigh_node_free_ref(router_gw); |
e1a5382f | 388 | if (router_orig) |
7d211efc | 389 | batadv_neigh_node_free_ref(router_orig); |
89652331 SW |
390 | if (router_gw_tq) |
391 | batadv_neigh_ifinfo_free_ref(router_gw_tq); | |
392 | if (router_orig_tq) | |
393 | batadv_neigh_ifinfo_free_ref(router_orig_tq); | |
c6c8fea2 SE |
394 | } |
395 | ||
414254e3 ML |
396 | /** |
397 | * batadv_gw_node_add - add gateway node to list of available gateways | |
398 | * @bat_priv: the bat priv with all the soft interface information | |
399 | * @orig_node: originator announcing gateway capabilities | |
400 | * @gateway: announced bandwidth information | |
401 | */ | |
56303d34 SE |
402 | static void batadv_gw_node_add(struct batadv_priv *bat_priv, |
403 | struct batadv_orig_node *orig_node, | |
414254e3 | 404 | struct batadv_tvlv_gateway_data *gateway) |
c6c8fea2 | 405 | { |
56303d34 | 406 | struct batadv_gw_node *gw_node; |
414254e3 ML |
407 | |
408 | if (gateway->bandwidth_down == 0) | |
409 | return; | |
c6c8fea2 | 410 | |
377fe0f9 AQ |
411 | if (!atomic_inc_not_zero(&orig_node->refcount)) |
412 | return; | |
413 | ||
704509b8 | 414 | gw_node = kzalloc(sizeof(*gw_node), GFP_ATOMIC); |
377fe0f9 AQ |
415 | if (!gw_node) { |
416 | batadv_orig_node_free_ref(orig_node); | |
c6c8fea2 | 417 | return; |
377fe0f9 | 418 | } |
c6c8fea2 | 419 | |
c6c8fea2 SE |
420 | INIT_HLIST_NODE(&gw_node->list); |
421 | gw_node->orig_node = orig_node; | |
25b6d3c1 | 422 | atomic_set(&gw_node->refcount, 1); |
c6c8fea2 | 423 | |
807736f6 SE |
424 | spin_lock_bh(&bat_priv->gw.list_lock); |
425 | hlist_add_head_rcu(&gw_node->list, &bat_priv->gw.list); | |
426 | spin_unlock_bh(&bat_priv->gw.list_lock); | |
c6c8fea2 | 427 | |
39c75a51 | 428 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
414254e3 ML |
429 | "Found new gateway %pM -> gw bandwidth: %u.%u/%u.%u MBit\n", |
430 | orig_node->orig, | |
431 | ntohl(gateway->bandwidth_down) / 10, | |
432 | ntohl(gateway->bandwidth_down) % 10, | |
433 | ntohl(gateway->bandwidth_up) / 10, | |
434 | ntohl(gateway->bandwidth_up) % 10); | |
c6c8fea2 SE |
435 | } |
436 | ||
414254e3 ML |
437 | /** |
438 | * batadv_gw_node_get - retrieve gateway node from list of available gateways | |
439 | * @bat_priv: the bat priv with all the soft interface information | |
440 | * @orig_node: originator announcing gateway capabilities | |
441 | * | |
442 | * Returns gateway node if found or NULL otherwise. | |
443 | */ | |
444 | static struct batadv_gw_node * | |
445 | batadv_gw_node_get(struct batadv_priv *bat_priv, | |
446 | struct batadv_orig_node *orig_node) | |
c6c8fea2 | 447 | { |
414254e3 | 448 | struct batadv_gw_node *gw_node_tmp, *gw_node = NULL; |
c6c8fea2 SE |
449 | |
450 | rcu_read_lock(); | |
414254e3 ML |
451 | hlist_for_each_entry_rcu(gw_node_tmp, &bat_priv->gw.list, list) { |
452 | if (gw_node_tmp->orig_node != orig_node) | |
c6c8fea2 SE |
453 | continue; |
454 | ||
414254e3 ML |
455 | if (gw_node_tmp->deleted) |
456 | continue; | |
c6c8fea2 | 457 | |
414254e3 ML |
458 | if (!atomic_inc_not_zero(&gw_node_tmp->refcount)) |
459 | continue; | |
c6c8fea2 | 460 | |
414254e3 ML |
461 | gw_node = gw_node_tmp; |
462 | break; | |
463 | } | |
464 | rcu_read_unlock(); | |
c6c8fea2 | 465 | |
414254e3 ML |
466 | return gw_node; |
467 | } | |
c6c8fea2 | 468 | |
414254e3 ML |
469 | /** |
470 | * batadv_gw_node_update - update list of available gateways with changed | |
471 | * bandwidth information | |
472 | * @bat_priv: the bat priv with all the soft interface information | |
473 | * @orig_node: originator announcing gateway capabilities | |
474 | * @gateway: announced bandwidth information | |
475 | */ | |
476 | void batadv_gw_node_update(struct batadv_priv *bat_priv, | |
477 | struct batadv_orig_node *orig_node, | |
478 | struct batadv_tvlv_gateway_data *gateway) | |
479 | { | |
480 | struct batadv_gw_node *gw_node, *curr_gw = NULL; | |
481 | ||
482 | gw_node = batadv_gw_node_get(bat_priv, orig_node); | |
483 | if (!gw_node) { | |
484 | batadv_gw_node_add(bat_priv, orig_node, gateway); | |
485 | goto out; | |
c6c8fea2 | 486 | } |
c6c8fea2 | 487 | |
414254e3 ML |
488 | if ((gw_node->bandwidth_down == ntohl(gateway->bandwidth_down)) && |
489 | (gw_node->bandwidth_up == ntohl(gateway->bandwidth_up))) | |
490 | goto out; | |
c6c8fea2 | 491 | |
414254e3 ML |
492 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
493 | "Gateway bandwidth of originator %pM changed from %u.%u/%u.%u MBit to %u.%u/%u.%u MBit\n", | |
494 | orig_node->orig, | |
495 | gw_node->bandwidth_down / 10, | |
496 | gw_node->bandwidth_down % 10, | |
497 | gw_node->bandwidth_up / 10, | |
498 | gw_node->bandwidth_up % 10, | |
499 | ntohl(gateway->bandwidth_down) / 10, | |
500 | ntohl(gateway->bandwidth_down) % 10, | |
501 | ntohl(gateway->bandwidth_up) / 10, | |
502 | ntohl(gateway->bandwidth_up) % 10); | |
503 | ||
504 | gw_node->bandwidth_down = ntohl(gateway->bandwidth_down); | |
505 | gw_node->bandwidth_up = ntohl(gateway->bandwidth_up); | |
506 | ||
507 | gw_node->deleted = 0; | |
508 | if (ntohl(gateway->bandwidth_down) == 0) { | |
509 | gw_node->deleted = jiffies; | |
510 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
511 | "Gateway %pM removed from gateway list\n", | |
512 | orig_node->orig); | |
c4aac1ab | 513 | |
414254e3 ML |
514 | /* Note: We don't need a NULL check here, since curr_gw never |
515 | * gets dereferenced. | |
516 | */ | |
517 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); | |
518 | if (gw_node == curr_gw) | |
4e820e72 | 519 | batadv_gw_reselect(bat_priv); |
414254e3 | 520 | } |
71e4aa9c | 521 | |
414254e3 | 522 | out: |
c4aac1ab | 523 | if (curr_gw) |
1409a834 | 524 | batadv_gw_node_free_ref(curr_gw); |
414254e3 ML |
525 | if (gw_node) |
526 | batadv_gw_node_free_ref(gw_node); | |
c6c8fea2 SE |
527 | } |
528 | ||
56303d34 SE |
529 | void batadv_gw_node_delete(struct batadv_priv *bat_priv, |
530 | struct batadv_orig_node *orig_node) | |
c6c8fea2 | 531 | { |
414254e3 ML |
532 | struct batadv_tvlv_gateway_data gateway; |
533 | ||
534 | gateway.bandwidth_down = 0; | |
535 | gateway.bandwidth_up = 0; | |
536 | ||
537 | batadv_gw_node_update(bat_priv, orig_node, &gateway); | |
c6c8fea2 SE |
538 | } |
539 | ||
56303d34 | 540 | void batadv_gw_node_purge(struct batadv_priv *bat_priv) |
c6c8fea2 | 541 | { |
56303d34 | 542 | struct batadv_gw_node *gw_node, *curr_gw; |
b67bfe0d | 543 | struct hlist_node *node_tmp; |
42d0b044 | 544 | unsigned long timeout = msecs_to_jiffies(2 * BATADV_PURGE_TIMEOUT); |
4e820e72 | 545 | int do_reselect = 0; |
c4aac1ab | 546 | |
1409a834 | 547 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
c6c8fea2 | 548 | |
807736f6 | 549 | spin_lock_bh(&bat_priv->gw.list_lock); |
c6c8fea2 | 550 | |
b67bfe0d | 551 | hlist_for_each_entry_safe(gw_node, node_tmp, |
807736f6 | 552 | &bat_priv->gw.list, list) { |
c6c8fea2 SE |
553 | if (((!gw_node->deleted) || |
554 | (time_before(jiffies, gw_node->deleted + timeout))) && | |
39c75a51 | 555 | atomic_read(&bat_priv->mesh_state) == BATADV_MESH_ACTIVE) |
c6c8fea2 SE |
556 | continue; |
557 | ||
c4aac1ab | 558 | if (curr_gw == gw_node) |
4e820e72 | 559 | do_reselect = 1; |
c6c8fea2 SE |
560 | |
561 | hlist_del_rcu(&gw_node->list); | |
1409a834 | 562 | batadv_gw_node_free_ref(gw_node); |
c6c8fea2 SE |
563 | } |
564 | ||
807736f6 | 565 | spin_unlock_bh(&bat_priv->gw.list_lock); |
c4aac1ab | 566 | |
4e820e72 AQ |
567 | /* gw_reselect() needs to acquire the gw_list_lock */ |
568 | if (do_reselect) | |
569 | batadv_gw_reselect(bat_priv); | |
c4aac1ab ML |
570 | |
571 | if (curr_gw) | |
1409a834 | 572 | batadv_gw_node_free_ref(curr_gw); |
c6c8fea2 SE |
573 | } |
574 | ||
9cfc7bd6 | 575 | /* fails if orig_node has no router */ |
56303d34 SE |
576 | static int batadv_write_buffer_text(struct batadv_priv *bat_priv, |
577 | struct seq_file *seq, | |
578 | const struct batadv_gw_node *gw_node) | |
c6c8fea2 | 579 | { |
56303d34 SE |
580 | struct batadv_gw_node *curr_gw; |
581 | struct batadv_neigh_node *router; | |
89652331 | 582 | struct batadv_neigh_ifinfo *router_ifinfo = NULL; |
414254e3 | 583 | int ret = -1; |
c6c8fea2 | 584 | |
7351a482 | 585 | router = batadv_orig_router_get(gw_node->orig_node, BATADV_IF_DEFAULT); |
e1a5382f LL |
586 | if (!router) |
587 | goto out; | |
5d02b3cd | 588 | |
89652331 SW |
589 | router_ifinfo = batadv_neigh_ifinfo_get(router, BATADV_IF_DEFAULT); |
590 | if (!router_ifinfo) | |
591 | goto out; | |
592 | ||
1409a834 | 593 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
5d02b3cd | 594 | |
414254e3 | 595 | ret = seq_printf(seq, "%s %pM (%3i) %pM [%10s]: %u.%u/%u.%u MBit\n", |
c4aac1ab ML |
596 | (curr_gw == gw_node ? "=>" : " "), |
597 | gw_node->orig_node->orig, | |
89652331 | 598 | router_ifinfo->bat_iv.tq_avg, router->addr, |
c4aac1ab | 599 | router->if_incoming->net_dev->name, |
414254e3 ML |
600 | gw_node->bandwidth_down / 10, |
601 | gw_node->bandwidth_down % 10, | |
602 | gw_node->bandwidth_up / 10, | |
603 | gw_node->bandwidth_up % 10); | |
5d02b3cd | 604 | |
c4aac1ab | 605 | if (curr_gw) |
1409a834 | 606 | batadv_gw_node_free_ref(curr_gw); |
e1a5382f | 607 | out: |
89652331 SW |
608 | if (router_ifinfo) |
609 | batadv_neigh_ifinfo_free_ref(router_ifinfo); | |
610 | if (router) | |
611 | batadv_neigh_node_free_ref(router); | |
5d02b3cd | 612 | return ret; |
c6c8fea2 SE |
613 | } |
614 | ||
7cf06bc6 | 615 | int batadv_gw_client_seq_print_text(struct seq_file *seq, void *offset) |
c6c8fea2 SE |
616 | { |
617 | struct net_device *net_dev = (struct net_device *)seq->private; | |
56303d34 SE |
618 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
619 | struct batadv_hard_iface *primary_if; | |
620 | struct batadv_gw_node *gw_node; | |
30da63a6 | 621 | int gw_count = 0; |
c6c8fea2 | 622 | |
30da63a6 ML |
623 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
624 | if (!primary_if) | |
32ae9b22 | 625 | goto out; |
c6c8fea2 | 626 | |
86ceb360 | 627 | seq_printf(seq, |
414254e3 | 628 | " %-12s (%s/%i) %17s [%10s]: advertised uplink bandwidth ... [B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s)]\n", |
42d0b044 SE |
629 | "Gateway", "#", BATADV_TQ_MAX_VALUE, "Nexthop", "outgoingIF", |
630 | BATADV_SOURCE_VERSION, primary_if->net_dev->name, | |
32ae9b22 | 631 | primary_if->net_dev->dev_addr, net_dev->name); |
c6c8fea2 SE |
632 | |
633 | rcu_read_lock(); | |
b67bfe0d | 634 | hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.list, list) { |
c6c8fea2 SE |
635 | if (gw_node->deleted) |
636 | continue; | |
637 | ||
e1a5382f | 638 | /* fails if orig_node has no router */ |
1409a834 | 639 | if (batadv_write_buffer_text(bat_priv, seq, gw_node) < 0) |
c6c8fea2 SE |
640 | continue; |
641 | ||
c6c8fea2 SE |
642 | gw_count++; |
643 | } | |
644 | rcu_read_unlock(); | |
645 | ||
646 | if (gw_count == 0) | |
0c814653 | 647 | seq_puts(seq, "No gateways in range ...\n"); |
c6c8fea2 | 648 | |
32ae9b22 ML |
649 | out: |
650 | if (primary_if) | |
e5d89254 | 651 | batadv_hardif_free_ref(primary_if); |
30da63a6 | 652 | return 0; |
c6c8fea2 SE |
653 | } |
654 | ||
6c413b1c AQ |
655 | /** |
656 | * batadv_gw_dhcp_recipient_get - check if a packet is a DHCP message | |
657 | * @skb: the packet to check | |
658 | * @header_len: a pointer to the batman-adv header size | |
659 | * @chaddr: buffer where the client address will be stored. Valid | |
660 | * only if the function returns BATADV_DHCP_TO_CLIENT | |
661 | * | |
662 | * Returns: | |
663 | * - BATADV_DHCP_NO if the packet is not a dhcp message or if there was an error | |
664 | * while parsing it | |
665 | * - BATADV_DHCP_TO_SERVER if this is a message going to the DHCP server | |
666 | * - BATADV_DHCP_TO_CLIENT if this is a message going to a DHCP client | |
667 | * | |
668 | * This function may re-allocate the data buffer of the skb passed as argument. | |
669 | */ | |
670 | enum batadv_dhcp_recipient | |
671 | batadv_gw_dhcp_recipient_get(struct sk_buff *skb, unsigned int *header_len, | |
672 | uint8_t *chaddr) | |
c6c8fea2 | 673 | { |
6c413b1c | 674 | enum batadv_dhcp_recipient ret = BATADV_DHCP_NO; |
c6c8fea2 SE |
675 | struct ethhdr *ethhdr; |
676 | struct iphdr *iphdr; | |
677 | struct ipv6hdr *ipv6hdr; | |
678 | struct udphdr *udphdr; | |
f7f8ed56 | 679 | struct vlan_ethhdr *vhdr; |
6c413b1c | 680 | int chaddr_offset; |
f7f8ed56 | 681 | __be16 proto; |
6c413b1c | 682 | uint8_t *p; |
c6c8fea2 SE |
683 | |
684 | /* check for ethernet header */ | |
be7af5cf | 685 | if (!pskb_may_pull(skb, *header_len + ETH_HLEN)) |
6c413b1c AQ |
686 | return BATADV_DHCP_NO; |
687 | ||
927c2ed7 | 688 | ethhdr = eth_hdr(skb); |
f7f8ed56 | 689 | proto = ethhdr->h_proto; |
be7af5cf | 690 | *header_len += ETH_HLEN; |
c6c8fea2 SE |
691 | |
692 | /* check for initial vlan header */ | |
f7f8ed56 | 693 | if (proto == htons(ETH_P_8021Q)) { |
be7af5cf | 694 | if (!pskb_may_pull(skb, *header_len + VLAN_HLEN)) |
6c413b1c | 695 | return BATADV_DHCP_NO; |
f7f8ed56 | 696 | |
927c2ed7 | 697 | vhdr = vlan_eth_hdr(skb); |
f7f8ed56 | 698 | proto = vhdr->h_vlan_encapsulated_proto; |
be7af5cf | 699 | *header_len += VLAN_HLEN; |
c6c8fea2 SE |
700 | } |
701 | ||
702 | /* check for ip header */ | |
f7f8ed56 AQ |
703 | switch (proto) { |
704 | case htons(ETH_P_IP): | |
be7af5cf | 705 | if (!pskb_may_pull(skb, *header_len + sizeof(*iphdr))) |
6c413b1c AQ |
706 | return BATADV_DHCP_NO; |
707 | ||
be7af5cf ML |
708 | iphdr = (struct iphdr *)(skb->data + *header_len); |
709 | *header_len += iphdr->ihl * 4; | |
c6c8fea2 SE |
710 | |
711 | /* check for udp header */ | |
712 | if (iphdr->protocol != IPPROTO_UDP) | |
6c413b1c | 713 | return BATADV_DHCP_NO; |
c6c8fea2 SE |
714 | |
715 | break; | |
f7f8ed56 | 716 | case htons(ETH_P_IPV6): |
be7af5cf | 717 | if (!pskb_may_pull(skb, *header_len + sizeof(*ipv6hdr))) |
6c413b1c AQ |
718 | return BATADV_DHCP_NO; |
719 | ||
be7af5cf ML |
720 | ipv6hdr = (struct ipv6hdr *)(skb->data + *header_len); |
721 | *header_len += sizeof(*ipv6hdr); | |
c6c8fea2 SE |
722 | |
723 | /* check for udp header */ | |
724 | if (ipv6hdr->nexthdr != IPPROTO_UDP) | |
6c413b1c | 725 | return BATADV_DHCP_NO; |
c6c8fea2 SE |
726 | |
727 | break; | |
728 | default: | |
6c413b1c | 729 | return BATADV_DHCP_NO; |
c6c8fea2 SE |
730 | } |
731 | ||
be7af5cf | 732 | if (!pskb_may_pull(skb, *header_len + sizeof(*udphdr))) |
6c413b1c | 733 | return BATADV_DHCP_NO; |
9d2c9488 LL |
734 | |
735 | /* skb->data might have been reallocated by pskb_may_pull() */ | |
927c2ed7 | 736 | ethhdr = eth_hdr(skb); |
9d2c9488 LL |
737 | if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) |
738 | ethhdr = (struct ethhdr *)(skb->data + VLAN_HLEN); | |
739 | ||
be7af5cf ML |
740 | udphdr = (struct udphdr *)(skb->data + *header_len); |
741 | *header_len += sizeof(*udphdr); | |
c6c8fea2 SE |
742 | |
743 | /* check for bootp port */ | |
6c413b1c AQ |
744 | switch (proto) { |
745 | case htons(ETH_P_IP): | |
746 | if (udphdr->dest == htons(67)) | |
747 | ret = BATADV_DHCP_TO_SERVER; | |
748 | else if (udphdr->source == htons(67)) | |
749 | ret = BATADV_DHCP_TO_CLIENT; | |
750 | break; | |
751 | case htons(ETH_P_IPV6): | |
752 | if (udphdr->dest == htons(547)) | |
753 | ret = BATADV_DHCP_TO_SERVER; | |
754 | else if (udphdr->source == htons(547)) | |
755 | ret = BATADV_DHCP_TO_CLIENT; | |
756 | break; | |
757 | } | |
c6c8fea2 | 758 | |
6c413b1c AQ |
759 | chaddr_offset = *header_len + BATADV_DHCP_CHADDR_OFFSET; |
760 | /* store the client address if the message is going to a client */ | |
761 | if (ret == BATADV_DHCP_TO_CLIENT && | |
762 | pskb_may_pull(skb, chaddr_offset + ETH_ALEN)) { | |
763 | /* check if the DHCP packet carries an Ethernet DHCP */ | |
764 | p = skb->data + *header_len + BATADV_DHCP_HTYPE_OFFSET; | |
765 | if (*p != BATADV_DHCP_HTYPE_ETHERNET) | |
766 | return BATADV_DHCP_NO; | |
767 | ||
768 | /* check if the DHCP packet carries a valid Ethernet address */ | |
769 | p = skb->data + *header_len + BATADV_DHCP_HLEN_OFFSET; | |
770 | if (*p != ETH_ALEN) | |
771 | return BATADV_DHCP_NO; | |
772 | ||
8fdd0153 | 773 | ether_addr_copy(chaddr, skb->data + chaddr_offset); |
6c413b1c | 774 | } |
c6c8fea2 | 775 | |
6c413b1c | 776 | return ret; |
be7af5cf | 777 | } |
bbb877ed AQ |
778 | /** |
779 | * batadv_gw_out_of_range - check if the dhcp request destination is the best gw | |
780 | * @bat_priv: the bat priv with all the soft interface information | |
781 | * @skb: the outgoing packet | |
782 | * | |
783 | * Check if the skb is a DHCP request and if it is sent to the current best GW | |
784 | * server. Due to topology changes it may be the case that the GW server | |
785 | * previously selected is not the best one anymore. | |
786 | * | |
787 | * Returns true if the packet destination is unicast and it is not the best gw, | |
788 | * false otherwise. | |
789 | * | |
790 | * This call might reallocate skb data. | |
6c413b1c | 791 | * Must be invoked only when the DHCP packet is going TO a DHCP SERVER. |
bbb877ed | 792 | */ |
56303d34 | 793 | bool batadv_gw_out_of_range(struct batadv_priv *bat_priv, |
9d2c9488 | 794 | struct sk_buff *skb) |
be7af5cf | 795 | { |
56303d34 SE |
796 | struct batadv_neigh_node *neigh_curr = NULL, *neigh_old = NULL; |
797 | struct batadv_orig_node *orig_dst_node = NULL; | |
414254e3 | 798 | struct batadv_gw_node *gw_node = NULL, *curr_gw = NULL; |
89652331 | 799 | struct batadv_neigh_ifinfo *curr_ifinfo, *old_ifinfo; |
6c413b1c AQ |
800 | struct ethhdr *ethhdr = (struct ethhdr *)skb->data; |
801 | bool out_of_range = false; | |
be7af5cf | 802 | uint8_t curr_tq_avg; |
bbb877ed AQ |
803 | unsigned short vid; |
804 | ||
805 | vid = batadv_get_vid(skb, 0); | |
be7af5cf | 806 | |
08c36d3e | 807 | orig_dst_node = batadv_transtable_search(bat_priv, ethhdr->h_source, |
bbb877ed | 808 | ethhdr->h_dest, vid); |
be7af5cf ML |
809 | if (!orig_dst_node) |
810 | goto out; | |
811 | ||
414254e3 ML |
812 | gw_node = batadv_gw_node_get(bat_priv, orig_dst_node); |
813 | if (!gw_node->bandwidth_down == 0) | |
be7af5cf ML |
814 | goto out; |
815 | ||
be7af5cf | 816 | switch (atomic_read(&bat_priv->gw_mode)) { |
cd646ab1 | 817 | case BATADV_GW_MODE_SERVER: |
be7af5cf | 818 | /* If we are a GW then we are our best GW. We can artificially |
9cfc7bd6 SE |
819 | * set the tq towards ourself as the maximum value |
820 | */ | |
42d0b044 | 821 | curr_tq_avg = BATADV_TQ_MAX_VALUE; |
be7af5cf | 822 | break; |
cd646ab1 | 823 | case BATADV_GW_MODE_CLIENT: |
1409a834 | 824 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
be7af5cf ML |
825 | if (!curr_gw) |
826 | goto out; | |
827 | ||
828 | /* packet is going to our gateway */ | |
829 | if (curr_gw->orig_node == orig_dst_node) | |
830 | goto out; | |
831 | ||
832 | /* If the dhcp packet has been sent to a different gw, | |
833 | * we have to evaluate whether the old gw is still | |
9cfc7bd6 SE |
834 | * reliable enough |
835 | */ | |
30d3c511 SE |
836 | neigh_curr = batadv_find_router(bat_priv, curr_gw->orig_node, |
837 | NULL); | |
be7af5cf ML |
838 | if (!neigh_curr) |
839 | goto out; | |
840 | ||
89652331 SW |
841 | curr_ifinfo = batadv_neigh_ifinfo_get(neigh_curr, |
842 | BATADV_IF_DEFAULT); | |
843 | if (!curr_ifinfo) | |
844 | goto out; | |
845 | ||
846 | curr_tq_avg = curr_ifinfo->bat_iv.tq_avg; | |
847 | batadv_neigh_ifinfo_free_ref(curr_ifinfo); | |
848 | ||
be7af5cf | 849 | break; |
cd646ab1 | 850 | case BATADV_GW_MODE_OFF: |
be7af5cf ML |
851 | default: |
852 | goto out; | |
43676ab5 | 853 | } |
be7af5cf | 854 | |
30d3c511 | 855 | neigh_old = batadv_find_router(bat_priv, orig_dst_node, NULL); |
2ef04f47 | 856 | if (!neigh_old) |
be7af5cf ML |
857 | goto out; |
858 | ||
89652331 SW |
859 | old_ifinfo = batadv_neigh_ifinfo_get(neigh_old, BATADV_IF_DEFAULT); |
860 | if (!old_ifinfo) | |
861 | goto out; | |
862 | ||
863 | if ((curr_tq_avg - old_ifinfo->bat_iv.tq_avg) > BATADV_GW_THRESHOLD) | |
be7af5cf | 864 | out_of_range = true; |
89652331 | 865 | batadv_neigh_ifinfo_free_ref(old_ifinfo); |
be7af5cf ML |
866 | |
867 | out: | |
868 | if (orig_dst_node) | |
7d211efc | 869 | batadv_orig_node_free_ref(orig_dst_node); |
be7af5cf | 870 | if (curr_gw) |
1409a834 | 871 | batadv_gw_node_free_ref(curr_gw); |
414254e3 ML |
872 | if (gw_node) |
873 | batadv_gw_node_free_ref(gw_node); | |
43676ab5 | 874 | if (neigh_old) |
7d211efc | 875 | batadv_neigh_node_free_ref(neigh_old); |
43676ab5 | 876 | if (neigh_curr) |
7d211efc | 877 | batadv_neigh_node_free_ref(neigh_curr); |
be7af5cf | 878 | return out_of_range; |
c6c8fea2 | 879 | } |