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Commit | Line | Data |
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7db7d9f3 | 1 | // SPDX-License-Identifier: GPL-2.0 |
cfa55c6d | 2 | /* Copyright (C) B.A.T.M.A.N. contributors: |
c6c8fea2 SE |
3 | * |
4 | * Marek Lindner | |
c6c8fea2 SE |
5 | */ |
6 | ||
c6c8fea2 | 7 | #include "gateway_client.h" |
1e2c2a4f SE |
8 | #include "main.h" |
9 | ||
10 | #include <linux/atomic.h> | |
11 | #include <linux/byteorder/generic.h> | |
d7129daf | 12 | #include <linux/errno.h> |
1e2c2a4f | 13 | #include <linux/etherdevice.h> |
b92b94ac | 14 | #include <linux/gfp.h> |
1e2c2a4f SE |
15 | #include <linux/if_ether.h> |
16 | #include <linux/if_vlan.h> | |
17 | #include <linux/in.h> | |
18 | #include <linux/ip.h> | |
19 | #include <linux/ipv6.h> | |
1e2c2a4f | 20 | #include <linux/kernel.h> |
e7aed321 | 21 | #include <linux/kref.h> |
1e2c2a4f | 22 | #include <linux/list.h> |
dff9bc42 | 23 | #include <linux/lockdep.h> |
1e2c2a4f | 24 | #include <linux/netdevice.h> |
d7129daf | 25 | #include <linux/netlink.h> |
1e2c2a4f SE |
26 | #include <linux/rculist.h> |
27 | #include <linux/rcupdate.h> | |
1e2c2a4f SE |
28 | #include <linux/skbuff.h> |
29 | #include <linux/slab.h> | |
30 | #include <linux/spinlock.h> | |
31 | #include <linux/stddef.h> | |
32 | #include <linux/udp.h> | |
d7129daf | 33 | #include <net/sock.h> |
fec149f5 | 34 | #include <uapi/linux/batadv_packet.h> |
d7129daf | 35 | #include <uapi/linux/batman_adv.h> |
1e2c2a4f | 36 | |
c6c8fea2 | 37 | #include "hard-interface.h" |
ba412080 | 38 | #include "log.h" |
d7129daf | 39 | #include "netlink.h" |
57f0c07c | 40 | #include "originator.h" |
43676ab5 | 41 | #include "routing.h" |
d7129daf | 42 | #include "soft-interface.h" |
1e2c2a4f | 43 | #include "translation-table.h" |
c6c8fea2 | 44 | |
6c413b1c AQ |
45 | /* These are the offsets of the "hw type" and "hw address length" in the dhcp |
46 | * packet starting at the beginning of the dhcp header | |
9cfc7bd6 | 47 | */ |
6c413b1c AQ |
48 | #define BATADV_DHCP_HTYPE_OFFSET 1 |
49 | #define BATADV_DHCP_HLEN_OFFSET 2 | |
50 | /* Value of htype representing Ethernet */ | |
51 | #define BATADV_DHCP_HTYPE_ETHERNET 0x01 | |
52 | /* This is the offset of the "chaddr" field in the dhcp packet starting at the | |
53 | * beginning of the dhcp header | |
54 | */ | |
55 | #define BATADV_DHCP_CHADDR_OFFSET 28 | |
43676ab5 | 56 | |
e7aed321 | 57 | /** |
7e9a8c2c SE |
58 | * batadv_gw_node_release() - release gw_node from lists and queue for free |
59 | * after rcu grace period | |
e7aed321 SE |
60 | * @ref: kref pointer of the gw_node |
61 | */ | |
6340dcbd | 62 | void batadv_gw_node_release(struct kref *ref) |
e7aed321 SE |
63 | { |
64 | struct batadv_gw_node *gw_node; | |
65 | ||
66 | gw_node = container_of(ref, struct batadv_gw_node, refcount); | |
67 | ||
5d967310 | 68 | batadv_orig_node_put(gw_node->orig_node); |
e7aed321 SE |
69 | kfree_rcu(gw_node, rcu); |
70 | } | |
71 | ||
ff15c27c SE |
72 | /** |
73 | * batadv_gw_get_selected_gw_node() - Get currently selected gateway | |
74 | * @bat_priv: the bat priv with all the soft interface information | |
75 | * | |
76 | * Return: selected gateway (with increased refcnt), NULL on errors | |
77 | */ | |
34d99cfe | 78 | struct batadv_gw_node * |
56303d34 | 79 | batadv_gw_get_selected_gw_node(struct batadv_priv *bat_priv) |
c6c8fea2 | 80 | { |
56303d34 | 81 | struct batadv_gw_node *gw_node; |
c6c8fea2 | 82 | |
5d02b3cd | 83 | rcu_read_lock(); |
807736f6 | 84 | gw_node = rcu_dereference(bat_priv->gw.curr_gw); |
c4aac1ab | 85 | if (!gw_node) |
7b36e8ee | 86 | goto out; |
c6c8fea2 | 87 | |
e7aed321 | 88 | if (!kref_get_unless_zero(&gw_node->refcount)) |
c4aac1ab | 89 | gw_node = NULL; |
43c70ad5 | 90 | |
5d02b3cd LL |
91 | out: |
92 | rcu_read_unlock(); | |
c4aac1ab | 93 | return gw_node; |
c6c8fea2 SE |
94 | } |
95 | ||
ff15c27c SE |
96 | /** |
97 | * batadv_gw_get_selected_orig() - Get originator of currently selected gateway | |
98 | * @bat_priv: the bat priv with all the soft interface information | |
99 | * | |
100 | * Return: orig_node of selected gateway (with increased refcnt), NULL on errors | |
101 | */ | |
56303d34 SE |
102 | struct batadv_orig_node * |
103 | batadv_gw_get_selected_orig(struct batadv_priv *bat_priv) | |
c6c8fea2 | 104 | { |
56303d34 SE |
105 | struct batadv_gw_node *gw_node; |
106 | struct batadv_orig_node *orig_node = NULL; | |
c6c8fea2 | 107 | |
1409a834 | 108 | gw_node = batadv_gw_get_selected_gw_node(bat_priv); |
c4aac1ab ML |
109 | if (!gw_node) |
110 | goto out; | |
111 | ||
112 | rcu_read_lock(); | |
113 | orig_node = gw_node->orig_node; | |
114 | if (!orig_node) | |
115 | goto unlock; | |
116 | ||
7c124391 | 117 | if (!kref_get_unless_zero(&orig_node->refcount)) |
c4aac1ab | 118 | orig_node = NULL; |
c6c8fea2 | 119 | |
c4aac1ab ML |
120 | unlock: |
121 | rcu_read_unlock(); | |
122 | out: | |
79a0bffb | 123 | batadv_gw_node_put(gw_node); |
c4aac1ab | 124 | return orig_node; |
c6c8fea2 SE |
125 | } |
126 | ||
56303d34 SE |
127 | static void batadv_gw_select(struct batadv_priv *bat_priv, |
128 | struct batadv_gw_node *new_gw_node) | |
c6c8fea2 | 129 | { |
56303d34 | 130 | struct batadv_gw_node *curr_gw_node; |
c6c8fea2 | 131 | |
807736f6 | 132 | spin_lock_bh(&bat_priv->gw.list_lock); |
c4aac1ab | 133 | |
a08d497d SE |
134 | if (new_gw_node) |
135 | kref_get(&new_gw_node->refcount); | |
c6c8fea2 | 136 | |
cf78bb0b AQ |
137 | curr_gw_node = rcu_replace_pointer(bat_priv->gw.curr_gw, new_gw_node, |
138 | true); | |
25b6d3c1 | 139 | |
79a0bffb | 140 | batadv_gw_node_put(curr_gw_node); |
c4aac1ab | 141 | |
807736f6 | 142 | spin_unlock_bh(&bat_priv->gw.list_lock); |
c4aac1ab ML |
143 | } |
144 | ||
4e820e72 | 145 | /** |
7e9a8c2c | 146 | * batadv_gw_reselect() - force a gateway reselection |
4e820e72 AQ |
147 | * @bat_priv: the bat priv with all the soft interface information |
148 | * | |
149 | * Set a flag to remind the GW component to perform a new gateway reselection. | |
150 | * However this function does not ensure that the current gateway is going to be | |
151 | * deselected. The reselection mechanism may elect the same gateway once again. | |
152 | * | |
153 | * This means that invoking batadv_gw_reselect() does not guarantee a gateway | |
154 | * change and therefore a uevent is not necessarily expected. | |
155 | */ | |
156 | void batadv_gw_reselect(struct batadv_priv *bat_priv) | |
c4aac1ab | 157 | { |
807736f6 | 158 | atomic_set(&bat_priv->gw.reselect, 1); |
c6c8fea2 SE |
159 | } |
160 | ||
c6eaa3f0 | 161 | /** |
7e9a8c2c | 162 | * batadv_gw_check_client_stop() - check if client mode has been switched off |
c6eaa3f0 AQ |
163 | * @bat_priv: the bat priv with all the soft interface information |
164 | * | |
165 | * This function assumes the caller has checked that the gw state *is actually | |
166 | * changing*. This function is not supposed to be called when there is no state | |
167 | * change. | |
168 | */ | |
169 | void batadv_gw_check_client_stop(struct batadv_priv *bat_priv) | |
170 | { | |
171 | struct batadv_gw_node *curr_gw; | |
172 | ||
3a24a63e | 173 | if (atomic_read(&bat_priv->gw.mode) != BATADV_GW_MODE_CLIENT) |
c6eaa3f0 AQ |
174 | return; |
175 | ||
176 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); | |
177 | if (!curr_gw) | |
178 | return; | |
179 | ||
f3163181 AQ |
180 | /* deselect the current gateway so that next time that client mode is |
181 | * enabled a proper GW_ADD event can be sent | |
182 | */ | |
183 | batadv_gw_select(bat_priv, NULL); | |
184 | ||
c6eaa3f0 AQ |
185 | /* if batman-adv is switching the gw client mode off and a gateway was |
186 | * already selected, send a DEL uevent | |
187 | */ | |
188 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL, NULL); | |
189 | ||
3a01743d | 190 | batadv_gw_node_put(curr_gw); |
c6eaa3f0 AQ |
191 | } |
192 | ||
ff15c27c SE |
193 | /** |
194 | * batadv_gw_election() - Elect the best gateway | |
195 | * @bat_priv: the bat priv with all the soft interface information | |
196 | */ | |
56303d34 | 197 | void batadv_gw_election(struct batadv_priv *bat_priv) |
2265c141 | 198 | { |
4f248cff SE |
199 | struct batadv_gw_node *curr_gw = NULL; |
200 | struct batadv_gw_node *next_gw = NULL; | |
56303d34 | 201 | struct batadv_neigh_node *router = NULL; |
89652331 | 202 | struct batadv_neigh_ifinfo *router_ifinfo = NULL; |
19595e05 | 203 | char gw_addr[18] = { '\0' }; |
2265c141 | 204 | |
3a24a63e | 205 | if (atomic_read(&bat_priv->gw.mode) != BATADV_GW_MODE_CLIENT) |
2265c141 AQ |
206 | goto out; |
207 | ||
34d99cfe AQ |
208 | if (!bat_priv->algo_ops->gw.get_best_gw_node) |
209 | goto out; | |
210 | ||
1409a834 | 211 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
2265c141 | 212 | |
807736f6 | 213 | if (!batadv_atomic_dec_not_zero(&bat_priv->gw.reselect) && curr_gw) |
caa0bf64 ML |
214 | goto out; |
215 | ||
34d99cfe AQ |
216 | /* if gw.reselect is set to 1 it means that a previous call to |
217 | * gw.is_eligible() said that we have a new best GW, therefore it can | |
218 | * now be picked from the list and selected | |
219 | */ | |
220 | next_gw = bat_priv->algo_ops->gw.get_best_gw_node(bat_priv); | |
2265c141 AQ |
221 | |
222 | if (curr_gw == next_gw) | |
223 | goto out; | |
224 | ||
225 | if (next_gw) { | |
19595e05 AQ |
226 | sprintf(gw_addr, "%pM", next_gw->orig_node->orig); |
227 | ||
7351a482 SW |
228 | router = batadv_orig_router_get(next_gw->orig_node, |
229 | BATADV_IF_DEFAULT); | |
2265c141 | 230 | if (!router) { |
4e820e72 | 231 | batadv_gw_reselect(bat_priv); |
2265c141 AQ |
232 | goto out; |
233 | } | |
89652331 SW |
234 | |
235 | router_ifinfo = batadv_neigh_ifinfo_get(router, | |
236 | BATADV_IF_DEFAULT); | |
237 | if (!router_ifinfo) { | |
238 | batadv_gw_reselect(bat_priv); | |
239 | goto out; | |
240 | } | |
c6c8fea2 SE |
241 | } |
242 | ||
825ffe1f | 243 | if (curr_gw && !next_gw) { |
39c75a51 | 244 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 245 | "Removing selected gateway - no gateway in range\n"); |
39c75a51 SE |
246 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL, |
247 | NULL); | |
825ffe1f | 248 | } else if (!curr_gw && next_gw) { |
39c75a51 | 249 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
414254e3 | 250 | "Adding route to gateway %pM (bandwidth: %u.%u/%u.%u MBit, tq: %i)\n", |
1eda58bf | 251 | next_gw->orig_node->orig, |
414254e3 ML |
252 | next_gw->bandwidth_down / 10, |
253 | next_gw->bandwidth_down % 10, | |
254 | next_gw->bandwidth_up / 10, | |
89652331 SW |
255 | next_gw->bandwidth_up % 10, |
256 | router_ifinfo->bat_iv.tq_avg); | |
39c75a51 SE |
257 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_ADD, |
258 | gw_addr); | |
2265c141 | 259 | } else { |
39c75a51 | 260 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
414254e3 | 261 | "Changing route to gateway %pM (bandwidth: %u.%u/%u.%u MBit, tq: %i)\n", |
1eda58bf | 262 | next_gw->orig_node->orig, |
414254e3 ML |
263 | next_gw->bandwidth_down / 10, |
264 | next_gw->bandwidth_down % 10, | |
265 | next_gw->bandwidth_up / 10, | |
89652331 SW |
266 | next_gw->bandwidth_up % 10, |
267 | router_ifinfo->bat_iv.tq_avg); | |
39c75a51 SE |
268 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_CHANGE, |
269 | gw_addr); | |
2265c141 AQ |
270 | } |
271 | ||
1409a834 | 272 | batadv_gw_select(bat_priv, next_gw); |
2265c141 | 273 | |
c4aac1ab | 274 | out: |
79a0bffb SE |
275 | batadv_gw_node_put(curr_gw); |
276 | batadv_gw_node_put(next_gw); | |
277 | batadv_neigh_node_put(router); | |
278 | batadv_neigh_ifinfo_put(router_ifinfo); | |
c6c8fea2 SE |
279 | } |
280 | ||
ff15c27c SE |
281 | /** |
282 | * batadv_gw_check_election() - Elect orig node as best gateway when eligible | |
283 | * @bat_priv: the bat priv with all the soft interface information | |
284 | * @orig_node: orig node which is to be checked | |
285 | */ | |
56303d34 SE |
286 | void batadv_gw_check_election(struct batadv_priv *bat_priv, |
287 | struct batadv_orig_node *orig_node) | |
c6c8fea2 | 288 | { |
56303d34 | 289 | struct batadv_orig_node *curr_gw_orig; |
34d99cfe AQ |
290 | |
291 | /* abort immediately if the routing algorithm does not support gateway | |
292 | * election | |
293 | */ | |
294 | if (!bat_priv->algo_ops->gw.is_eligible) | |
295 | return; | |
c6c8fea2 | 296 | |
7cf06bc6 | 297 | curr_gw_orig = batadv_gw_get_selected_orig(bat_priv); |
57f0c07c | 298 | if (!curr_gw_orig) |
4e820e72 | 299 | goto reselect; |
c6c8fea2 | 300 | |
c6c8fea2 | 301 | /* this node already is the gateway */ |
57f0c07c | 302 | if (curr_gw_orig == orig_node) |
e1a5382f | 303 | goto out; |
c6c8fea2 | 304 | |
34d99cfe AQ |
305 | if (!bat_priv->algo_ops->gw.is_eligible(bat_priv, curr_gw_orig, |
306 | orig_node)) | |
e1a5382f | 307 | goto out; |
5d02b3cd | 308 | |
4e820e72 AQ |
309 | reselect: |
310 | batadv_gw_reselect(bat_priv); | |
5d02b3cd | 311 | out: |
79a0bffb | 312 | batadv_orig_node_put(curr_gw_orig); |
c6c8fea2 SE |
313 | } |
314 | ||
414254e3 | 315 | /** |
7e9a8c2c | 316 | * batadv_gw_node_add() - add gateway node to list of available gateways |
414254e3 ML |
317 | * @bat_priv: the bat priv with all the soft interface information |
318 | * @orig_node: originator announcing gateway capabilities | |
319 | * @gateway: announced bandwidth information | |
dff9bc42 SE |
320 | * |
321 | * Has to be called with the appropriate locks being acquired | |
322 | * (gw.list_lock). | |
414254e3 | 323 | */ |
56303d34 SE |
324 | static void batadv_gw_node_add(struct batadv_priv *bat_priv, |
325 | struct batadv_orig_node *orig_node, | |
414254e3 | 326 | struct batadv_tvlv_gateway_data *gateway) |
c6c8fea2 | 327 | { |
56303d34 | 328 | struct batadv_gw_node *gw_node; |
414254e3 | 329 | |
dff9bc42 SE |
330 | lockdep_assert_held(&bat_priv->gw.list_lock); |
331 | ||
414254e3 ML |
332 | if (gateway->bandwidth_down == 0) |
333 | return; | |
c6c8fea2 | 334 | |
704509b8 | 335 | gw_node = kzalloc(sizeof(*gw_node), GFP_ATOMIC); |
c3ba37a7 | 336 | if (!gw_node) |
c6c8fea2 SE |
337 | return; |
338 | ||
f665fa7e | 339 | kref_init(&gw_node->refcount); |
c6c8fea2 | 340 | INIT_HLIST_NODE(&gw_node->list); |
55db2d59 | 341 | kref_get(&orig_node->refcount); |
c6c8fea2 | 342 | gw_node->orig_node = orig_node; |
27a4d5ef SW |
343 | gw_node->bandwidth_down = ntohl(gateway->bandwidth_down); |
344 | gw_node->bandwidth_up = ntohl(gateway->bandwidth_up); | |
c6c8fea2 | 345 | |
f665fa7e | 346 | kref_get(&gw_node->refcount); |
70ea5cee | 347 | hlist_add_head_rcu(&gw_node->list, &bat_priv->gw.gateway_list); |
9264c85c | 348 | bat_priv->gw.generation++; |
c6c8fea2 | 349 | |
39c75a51 | 350 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
414254e3 ML |
351 | "Found new gateway %pM -> gw bandwidth: %u.%u/%u.%u MBit\n", |
352 | orig_node->orig, | |
353 | ntohl(gateway->bandwidth_down) / 10, | |
354 | ntohl(gateway->bandwidth_down) % 10, | |
355 | ntohl(gateway->bandwidth_up) / 10, | |
356 | ntohl(gateway->bandwidth_up) % 10); | |
f665fa7e SE |
357 | |
358 | /* don't return reference to new gw_node */ | |
359 | batadv_gw_node_put(gw_node); | |
c6c8fea2 SE |
360 | } |
361 | ||
414254e3 | 362 | /** |
7e9a8c2c | 363 | * batadv_gw_node_get() - retrieve gateway node from list of available gateways |
414254e3 ML |
364 | * @bat_priv: the bat priv with all the soft interface information |
365 | * @orig_node: originator announcing gateway capabilities | |
366 | * | |
62fe710f | 367 | * Return: gateway node if found or NULL otherwise. |
414254e3 | 368 | */ |
50164d8f AQ |
369 | struct batadv_gw_node *batadv_gw_node_get(struct batadv_priv *bat_priv, |
370 | struct batadv_orig_node *orig_node) | |
c6c8fea2 | 371 | { |
414254e3 | 372 | struct batadv_gw_node *gw_node_tmp, *gw_node = NULL; |
c6c8fea2 SE |
373 | |
374 | rcu_read_lock(); | |
70ea5cee SE |
375 | hlist_for_each_entry_rcu(gw_node_tmp, &bat_priv->gw.gateway_list, |
376 | list) { | |
414254e3 | 377 | if (gw_node_tmp->orig_node != orig_node) |
c6c8fea2 SE |
378 | continue; |
379 | ||
e7aed321 | 380 | if (!kref_get_unless_zero(&gw_node_tmp->refcount)) |
414254e3 | 381 | continue; |
c6c8fea2 | 382 | |
414254e3 ML |
383 | gw_node = gw_node_tmp; |
384 | break; | |
385 | } | |
386 | rcu_read_unlock(); | |
c6c8fea2 | 387 | |
414254e3 ML |
388 | return gw_node; |
389 | } | |
c6c8fea2 | 390 | |
414254e3 | 391 | /** |
7e9a8c2c | 392 | * batadv_gw_node_update() - update list of available gateways with changed |
414254e3 ML |
393 | * bandwidth information |
394 | * @bat_priv: the bat priv with all the soft interface information | |
395 | * @orig_node: originator announcing gateway capabilities | |
396 | * @gateway: announced bandwidth information | |
397 | */ | |
398 | void batadv_gw_node_update(struct batadv_priv *bat_priv, | |
399 | struct batadv_orig_node *orig_node, | |
400 | struct batadv_tvlv_gateway_data *gateway) | |
401 | { | |
402 | struct batadv_gw_node *gw_node, *curr_gw = NULL; | |
403 | ||
dff9bc42 | 404 | spin_lock_bh(&bat_priv->gw.list_lock); |
414254e3 ML |
405 | gw_node = batadv_gw_node_get(bat_priv, orig_node); |
406 | if (!gw_node) { | |
407 | batadv_gw_node_add(bat_priv, orig_node, gateway); | |
dff9bc42 | 408 | spin_unlock_bh(&bat_priv->gw.list_lock); |
414254e3 | 409 | goto out; |
c6c8fea2 | 410 | } |
dff9bc42 | 411 | spin_unlock_bh(&bat_priv->gw.list_lock); |
c6c8fea2 | 412 | |
825ffe1f SE |
413 | if (gw_node->bandwidth_down == ntohl(gateway->bandwidth_down) && |
414 | gw_node->bandwidth_up == ntohl(gateway->bandwidth_up)) | |
414254e3 | 415 | goto out; |
c6c8fea2 | 416 | |
414254e3 ML |
417 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
418 | "Gateway bandwidth of originator %pM changed from %u.%u/%u.%u MBit to %u.%u/%u.%u MBit\n", | |
419 | orig_node->orig, | |
420 | gw_node->bandwidth_down / 10, | |
421 | gw_node->bandwidth_down % 10, | |
422 | gw_node->bandwidth_up / 10, | |
423 | gw_node->bandwidth_up % 10, | |
424 | ntohl(gateway->bandwidth_down) / 10, | |
425 | ntohl(gateway->bandwidth_down) % 10, | |
426 | ntohl(gateway->bandwidth_up) / 10, | |
427 | ntohl(gateway->bandwidth_up) % 10); | |
428 | ||
429 | gw_node->bandwidth_down = ntohl(gateway->bandwidth_down); | |
430 | gw_node->bandwidth_up = ntohl(gateway->bandwidth_up); | |
431 | ||
414254e3 | 432 | if (ntohl(gateway->bandwidth_down) == 0) { |
414254e3 ML |
433 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
434 | "Gateway %pM removed from gateway list\n", | |
435 | orig_node->orig); | |
c4aac1ab | 436 | |
414254e3 ML |
437 | /* Note: We don't need a NULL check here, since curr_gw never |
438 | * gets dereferenced. | |
439 | */ | |
bd3524c1 | 440 | spin_lock_bh(&bat_priv->gw.list_lock); |
c18bdd01 SE |
441 | if (!hlist_unhashed(&gw_node->list)) { |
442 | hlist_del_init_rcu(&gw_node->list); | |
3a01743d | 443 | batadv_gw_node_put(gw_node); |
9264c85c | 444 | bat_priv->gw.generation++; |
c18bdd01 | 445 | } |
bd3524c1 SW |
446 | spin_unlock_bh(&bat_priv->gw.list_lock); |
447 | ||
414254e3 ML |
448 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
449 | if (gw_node == curr_gw) | |
4e820e72 | 450 | batadv_gw_reselect(bat_priv); |
bd3524c1 | 451 | |
79a0bffb | 452 | batadv_gw_node_put(curr_gw); |
414254e3 | 453 | } |
71e4aa9c | 454 | |
414254e3 | 455 | out: |
79a0bffb | 456 | batadv_gw_node_put(gw_node); |
c6c8fea2 SE |
457 | } |
458 | ||
ff15c27c SE |
459 | /** |
460 | * batadv_gw_node_delete() - Remove orig_node from gateway list | |
461 | * @bat_priv: the bat priv with all the soft interface information | |
462 | * @orig_node: orig node which is currently in process of being removed | |
463 | */ | |
56303d34 SE |
464 | void batadv_gw_node_delete(struct batadv_priv *bat_priv, |
465 | struct batadv_orig_node *orig_node) | |
c6c8fea2 | 466 | { |
414254e3 ML |
467 | struct batadv_tvlv_gateway_data gateway; |
468 | ||
469 | gateway.bandwidth_down = 0; | |
470 | gateway.bandwidth_up = 0; | |
471 | ||
472 | batadv_gw_node_update(bat_priv, orig_node, &gateway); | |
c6c8fea2 SE |
473 | } |
474 | ||
ff15c27c SE |
475 | /** |
476 | * batadv_gw_node_free() - Free gateway information from soft interface | |
477 | * @bat_priv: the bat priv with all the soft interface information | |
478 | */ | |
bd3524c1 | 479 | void batadv_gw_node_free(struct batadv_priv *bat_priv) |
c6c8fea2 | 480 | { |
bd3524c1 | 481 | struct batadv_gw_node *gw_node; |
b67bfe0d | 482 | struct hlist_node *node_tmp; |
c6c8fea2 | 483 | |
807736f6 | 484 | spin_lock_bh(&bat_priv->gw.list_lock); |
b67bfe0d | 485 | hlist_for_each_entry_safe(gw_node, node_tmp, |
70ea5cee | 486 | &bat_priv->gw.gateway_list, list) { |
bd3524c1 | 487 | hlist_del_init_rcu(&gw_node->list); |
3a01743d | 488 | batadv_gw_node_put(gw_node); |
9264c85c | 489 | bat_priv->gw.generation++; |
c6c8fea2 | 490 | } |
807736f6 | 491 | spin_unlock_bh(&bat_priv->gw.list_lock); |
c6c8fea2 SE |
492 | } |
493 | ||
d7129daf | 494 | /** |
7e9a8c2c | 495 | * batadv_gw_dump() - Dump gateways into a message |
d7129daf SE |
496 | * @msg: Netlink message to dump into |
497 | * @cb: Control block containing additional options | |
498 | * | |
499 | * Return: Error code, or length of message | |
500 | */ | |
501 | int batadv_gw_dump(struct sk_buff *msg, struct netlink_callback *cb) | |
502 | { | |
503 | struct batadv_hard_iface *primary_if = NULL; | |
504 | struct net *net = sock_net(cb->skb->sk); | |
505 | struct net_device *soft_iface; | |
506 | struct batadv_priv *bat_priv; | |
507 | int ifindex; | |
508 | int ret; | |
509 | ||
510 | ifindex = batadv_netlink_get_ifindex(cb->nlh, | |
511 | BATADV_ATTR_MESH_IFINDEX); | |
512 | if (!ifindex) | |
513 | return -EINVAL; | |
514 | ||
515 | soft_iface = dev_get_by_index(net, ifindex); | |
516 | if (!soft_iface || !batadv_softif_is_valid(soft_iface)) { | |
517 | ret = -ENODEV; | |
518 | goto out; | |
519 | } | |
520 | ||
521 | bat_priv = netdev_priv(soft_iface); | |
522 | ||
523 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
524 | if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) { | |
525 | ret = -ENOENT; | |
526 | goto out; | |
527 | } | |
528 | ||
529 | if (!bat_priv->algo_ops->gw.dump) { | |
530 | ret = -EOPNOTSUPP; | |
531 | goto out; | |
532 | } | |
533 | ||
534 | bat_priv->algo_ops->gw.dump(msg, cb, bat_priv); | |
535 | ||
536 | ret = msg->len; | |
537 | ||
538 | out: | |
79a0bffb | 539 | batadv_hardif_put(primary_if); |
1160dfa1 | 540 | dev_put(soft_iface); |
d7129daf SE |
541 | |
542 | return ret; | |
543 | } | |
544 | ||
6c413b1c | 545 | /** |
7e9a8c2c | 546 | * batadv_gw_dhcp_recipient_get() - check if a packet is a DHCP message |
6c413b1c AQ |
547 | * @skb: the packet to check |
548 | * @header_len: a pointer to the batman-adv header size | |
549 | * @chaddr: buffer where the client address will be stored. Valid | |
550 | * only if the function returns BATADV_DHCP_TO_CLIENT | |
551 | * | |
62fe710f SE |
552 | * This function may re-allocate the data buffer of the skb passed as argument. |
553 | * | |
554 | * Return: | |
6c413b1c AQ |
555 | * - BATADV_DHCP_NO if the packet is not a dhcp message or if there was an error |
556 | * while parsing it | |
557 | * - BATADV_DHCP_TO_SERVER if this is a message going to the DHCP server | |
558 | * - BATADV_DHCP_TO_CLIENT if this is a message going to a DHCP client | |
6c413b1c AQ |
559 | */ |
560 | enum batadv_dhcp_recipient | |
561 | batadv_gw_dhcp_recipient_get(struct sk_buff *skb, unsigned int *header_len, | |
6b5e971a | 562 | u8 *chaddr) |
c6c8fea2 | 563 | { |
6c413b1c | 564 | enum batadv_dhcp_recipient ret = BATADV_DHCP_NO; |
c6c8fea2 SE |
565 | struct ethhdr *ethhdr; |
566 | struct iphdr *iphdr; | |
567 | struct ipv6hdr *ipv6hdr; | |
568 | struct udphdr *udphdr; | |
f7f8ed56 | 569 | struct vlan_ethhdr *vhdr; |
6c413b1c | 570 | int chaddr_offset; |
f7f8ed56 | 571 | __be16 proto; |
6b5e971a | 572 | u8 *p; |
c6c8fea2 SE |
573 | |
574 | /* check for ethernet header */ | |
be7af5cf | 575 | if (!pskb_may_pull(skb, *header_len + ETH_HLEN)) |
6c413b1c AQ |
576 | return BATADV_DHCP_NO; |
577 | ||
927c2ed7 | 578 | ethhdr = eth_hdr(skb); |
f7f8ed56 | 579 | proto = ethhdr->h_proto; |
be7af5cf | 580 | *header_len += ETH_HLEN; |
c6c8fea2 SE |
581 | |
582 | /* check for initial vlan header */ | |
f7f8ed56 | 583 | if (proto == htons(ETH_P_8021Q)) { |
be7af5cf | 584 | if (!pskb_may_pull(skb, *header_len + VLAN_HLEN)) |
6c413b1c | 585 | return BATADV_DHCP_NO; |
f7f8ed56 | 586 | |
927c2ed7 | 587 | vhdr = vlan_eth_hdr(skb); |
f7f8ed56 | 588 | proto = vhdr->h_vlan_encapsulated_proto; |
be7af5cf | 589 | *header_len += VLAN_HLEN; |
c6c8fea2 SE |
590 | } |
591 | ||
592 | /* check for ip header */ | |
f7f8ed56 AQ |
593 | switch (proto) { |
594 | case htons(ETH_P_IP): | |
be7af5cf | 595 | if (!pskb_may_pull(skb, *header_len + sizeof(*iphdr))) |
6c413b1c AQ |
596 | return BATADV_DHCP_NO; |
597 | ||
be7af5cf ML |
598 | iphdr = (struct iphdr *)(skb->data + *header_len); |
599 | *header_len += iphdr->ihl * 4; | |
c6c8fea2 SE |
600 | |
601 | /* check for udp header */ | |
602 | if (iphdr->protocol != IPPROTO_UDP) | |
6c413b1c | 603 | return BATADV_DHCP_NO; |
c6c8fea2 SE |
604 | |
605 | break; | |
f7f8ed56 | 606 | case htons(ETH_P_IPV6): |
be7af5cf | 607 | if (!pskb_may_pull(skb, *header_len + sizeof(*ipv6hdr))) |
6c413b1c AQ |
608 | return BATADV_DHCP_NO; |
609 | ||
be7af5cf ML |
610 | ipv6hdr = (struct ipv6hdr *)(skb->data + *header_len); |
611 | *header_len += sizeof(*ipv6hdr); | |
c6c8fea2 SE |
612 | |
613 | /* check for udp header */ | |
614 | if (ipv6hdr->nexthdr != IPPROTO_UDP) | |
6c413b1c | 615 | return BATADV_DHCP_NO; |
c6c8fea2 SE |
616 | |
617 | break; | |
618 | default: | |
6c413b1c | 619 | return BATADV_DHCP_NO; |
c6c8fea2 SE |
620 | } |
621 | ||
be7af5cf | 622 | if (!pskb_may_pull(skb, *header_len + sizeof(*udphdr))) |
6c413b1c | 623 | return BATADV_DHCP_NO; |
9d2c9488 | 624 | |
be7af5cf ML |
625 | udphdr = (struct udphdr *)(skb->data + *header_len); |
626 | *header_len += sizeof(*udphdr); | |
c6c8fea2 SE |
627 | |
628 | /* check for bootp port */ | |
6c413b1c AQ |
629 | switch (proto) { |
630 | case htons(ETH_P_IP): | |
631 | if (udphdr->dest == htons(67)) | |
632 | ret = BATADV_DHCP_TO_SERVER; | |
633 | else if (udphdr->source == htons(67)) | |
634 | ret = BATADV_DHCP_TO_CLIENT; | |
635 | break; | |
636 | case htons(ETH_P_IPV6): | |
637 | if (udphdr->dest == htons(547)) | |
638 | ret = BATADV_DHCP_TO_SERVER; | |
639 | else if (udphdr->source == htons(547)) | |
640 | ret = BATADV_DHCP_TO_CLIENT; | |
641 | break; | |
642 | } | |
c6c8fea2 | 643 | |
6c413b1c AQ |
644 | chaddr_offset = *header_len + BATADV_DHCP_CHADDR_OFFSET; |
645 | /* store the client address if the message is going to a client */ | |
303216e7 SE |
646 | if (ret == BATADV_DHCP_TO_CLIENT) { |
647 | if (!pskb_may_pull(skb, chaddr_offset + ETH_ALEN)) | |
648 | return BATADV_DHCP_NO; | |
649 | ||
6c413b1c AQ |
650 | /* check if the DHCP packet carries an Ethernet DHCP */ |
651 | p = skb->data + *header_len + BATADV_DHCP_HTYPE_OFFSET; | |
652 | if (*p != BATADV_DHCP_HTYPE_ETHERNET) | |
653 | return BATADV_DHCP_NO; | |
654 | ||
655 | /* check if the DHCP packet carries a valid Ethernet address */ | |
656 | p = skb->data + *header_len + BATADV_DHCP_HLEN_OFFSET; | |
657 | if (*p != ETH_ALEN) | |
658 | return BATADV_DHCP_NO; | |
659 | ||
8fdd0153 | 660 | ether_addr_copy(chaddr, skb->data + chaddr_offset); |
6c413b1c | 661 | } |
c6c8fea2 | 662 | |
6c413b1c | 663 | return ret; |
be7af5cf | 664 | } |
aa143d28 | 665 | |
bbb877ed | 666 | /** |
7e9a8c2c SE |
667 | * batadv_gw_out_of_range() - check if the dhcp request destination is the best |
668 | * gateway | |
bbb877ed AQ |
669 | * @bat_priv: the bat priv with all the soft interface information |
670 | * @skb: the outgoing packet | |
671 | * | |
672 | * Check if the skb is a DHCP request and if it is sent to the current best GW | |
673 | * server. Due to topology changes it may be the case that the GW server | |
674 | * previously selected is not the best one anymore. | |
675 | * | |
bbb877ed | 676 | * This call might reallocate skb data. |
6c413b1c | 677 | * Must be invoked only when the DHCP packet is going TO a DHCP SERVER. |
62fe710f SE |
678 | * |
679 | * Return: true if the packet destination is unicast and it is not the best gw, | |
680 | * false otherwise. | |
bbb877ed | 681 | */ |
56303d34 | 682 | bool batadv_gw_out_of_range(struct batadv_priv *bat_priv, |
9d2c9488 | 683 | struct sk_buff *skb) |
be7af5cf | 684 | { |
4f248cff SE |
685 | struct batadv_neigh_node *neigh_curr = NULL; |
686 | struct batadv_neigh_node *neigh_old = NULL; | |
a752c0a4 | 687 | struct batadv_orig_node *orig_dst_node = NULL; |
4f248cff SE |
688 | struct batadv_gw_node *gw_node = NULL; |
689 | struct batadv_gw_node *curr_gw = NULL; | |
89652331 | 690 | struct batadv_neigh_ifinfo *curr_ifinfo, *old_ifinfo; |
6c413b1c AQ |
691 | struct ethhdr *ethhdr = (struct ethhdr *)skb->data; |
692 | bool out_of_range = false; | |
6b5e971a | 693 | u8 curr_tq_avg; |
bbb877ed AQ |
694 | unsigned short vid; |
695 | ||
696 | vid = batadv_get_vid(skb, 0); | |
be7af5cf | 697 | |
a752c0a4 LL |
698 | if (is_multicast_ether_addr(ethhdr->h_dest)) |
699 | goto out; | |
700 | ||
08c36d3e | 701 | orig_dst_node = batadv_transtable_search(bat_priv, ethhdr->h_source, |
bbb877ed | 702 | ethhdr->h_dest, vid); |
be7af5cf ML |
703 | if (!orig_dst_node) |
704 | goto out; | |
705 | ||
414254e3 | 706 | gw_node = batadv_gw_node_get(bat_priv, orig_dst_node); |
0d164491 | 707 | if (!gw_node) |
be7af5cf ML |
708 | goto out; |
709 | ||
3a24a63e | 710 | switch (atomic_read(&bat_priv->gw.mode)) { |
cd646ab1 | 711 | case BATADV_GW_MODE_SERVER: |
be7af5cf | 712 | /* If we are a GW then we are our best GW. We can artificially |
9cfc7bd6 SE |
713 | * set the tq towards ourself as the maximum value |
714 | */ | |
42d0b044 | 715 | curr_tq_avg = BATADV_TQ_MAX_VALUE; |
be7af5cf | 716 | break; |
cd646ab1 | 717 | case BATADV_GW_MODE_CLIENT: |
1409a834 | 718 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
be7af5cf ML |
719 | if (!curr_gw) |
720 | goto out; | |
721 | ||
722 | /* packet is going to our gateway */ | |
723 | if (curr_gw->orig_node == orig_dst_node) | |
724 | goto out; | |
725 | ||
726 | /* If the dhcp packet has been sent to a different gw, | |
727 | * we have to evaluate whether the old gw is still | |
9cfc7bd6 SE |
728 | * reliable enough |
729 | */ | |
30d3c511 SE |
730 | neigh_curr = batadv_find_router(bat_priv, curr_gw->orig_node, |
731 | NULL); | |
be7af5cf ML |
732 | if (!neigh_curr) |
733 | goto out; | |
734 | ||
89652331 SW |
735 | curr_ifinfo = batadv_neigh_ifinfo_get(neigh_curr, |
736 | BATADV_IF_DEFAULT); | |
737 | if (!curr_ifinfo) | |
738 | goto out; | |
739 | ||
740 | curr_tq_avg = curr_ifinfo->bat_iv.tq_avg; | |
044fa3ae | 741 | batadv_neigh_ifinfo_put(curr_ifinfo); |
89652331 | 742 | |
be7af5cf | 743 | break; |
cd646ab1 | 744 | case BATADV_GW_MODE_OFF: |
be7af5cf ML |
745 | default: |
746 | goto out; | |
43676ab5 | 747 | } |
be7af5cf | 748 | |
30d3c511 | 749 | neigh_old = batadv_find_router(bat_priv, orig_dst_node, NULL); |
2ef04f47 | 750 | if (!neigh_old) |
be7af5cf ML |
751 | goto out; |
752 | ||
89652331 SW |
753 | old_ifinfo = batadv_neigh_ifinfo_get(neigh_old, BATADV_IF_DEFAULT); |
754 | if (!old_ifinfo) | |
755 | goto out; | |
756 | ||
757 | if ((curr_tq_avg - old_ifinfo->bat_iv.tq_avg) > BATADV_GW_THRESHOLD) | |
be7af5cf | 758 | out_of_range = true; |
044fa3ae | 759 | batadv_neigh_ifinfo_put(old_ifinfo); |
be7af5cf ML |
760 | |
761 | out: | |
79a0bffb SE |
762 | batadv_orig_node_put(orig_dst_node); |
763 | batadv_gw_node_put(curr_gw); | |
764 | batadv_gw_node_put(gw_node); | |
765 | batadv_neigh_node_put(neigh_old); | |
766 | batadv_neigh_node_put(neigh_curr); | |
be7af5cf | 767 | return out_of_range; |
c6c8fea2 | 768 | } |