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ac79cbb9 | 1 | /* Copyright (C) 2009-2017 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> | |
d7129daf | 23 | #include <linux/errno.h> |
1e2c2a4f SE |
24 | #include <linux/etherdevice.h> |
25 | #include <linux/fs.h> | |
26 | #include <linux/if_ether.h> | |
27 | #include <linux/if_vlan.h> | |
28 | #include <linux/in.h> | |
29 | #include <linux/ip.h> | |
30 | #include <linux/ipv6.h> | |
1e2c2a4f | 31 | #include <linux/kernel.h> |
e7aed321 | 32 | #include <linux/kref.h> |
1e2c2a4f | 33 | #include <linux/list.h> |
90abeff5 | 34 | #include <linux/lockdep.h> |
1e2c2a4f | 35 | #include <linux/netdevice.h> |
d7129daf | 36 | #include <linux/netlink.h> |
1e2c2a4f SE |
37 | #include <linux/rculist.h> |
38 | #include <linux/rcupdate.h> | |
39 | #include <linux/seq_file.h> | |
40 | #include <linux/skbuff.h> | |
41 | #include <linux/slab.h> | |
42 | #include <linux/spinlock.h> | |
43 | #include <linux/stddef.h> | |
44 | #include <linux/udp.h> | |
d7129daf SE |
45 | #include <net/sock.h> |
46 | #include <uapi/linux/batman_adv.h> | |
1e2c2a4f | 47 | |
c6c8fea2 SE |
48 | #include "gateway_common.h" |
49 | #include "hard-interface.h" | |
ba412080 | 50 | #include "log.h" |
d7129daf | 51 | #include "netlink.h" |
57f0c07c | 52 | #include "originator.h" |
1e2c2a4f | 53 | #include "packet.h" |
43676ab5 | 54 | #include "routing.h" |
d7129daf | 55 | #include "soft-interface.h" |
1e2c2a4f SE |
56 | #include "sysfs.h" |
57 | #include "translation-table.h" | |
c6c8fea2 | 58 | |
6c413b1c AQ |
59 | /* These are the offsets of the "hw type" and "hw address length" in the dhcp |
60 | * packet starting at the beginning of the dhcp header | |
9cfc7bd6 | 61 | */ |
6c413b1c AQ |
62 | #define BATADV_DHCP_HTYPE_OFFSET 1 |
63 | #define BATADV_DHCP_HLEN_OFFSET 2 | |
64 | /* Value of htype representing Ethernet */ | |
65 | #define BATADV_DHCP_HTYPE_ETHERNET 0x01 | |
66 | /* This is the offset of the "chaddr" field in the dhcp packet starting at the | |
67 | * beginning of the dhcp header | |
68 | */ | |
69 | #define BATADV_DHCP_CHADDR_OFFSET 28 | |
43676ab5 | 70 | |
e7aed321 SE |
71 | /** |
72 | * batadv_gw_node_release - release gw_node from lists and queue for free after | |
73 | * rcu grace period | |
74 | * @ref: kref pointer of the gw_node | |
75 | */ | |
76 | static void batadv_gw_node_release(struct kref *ref) | |
77 | { | |
78 | struct batadv_gw_node *gw_node; | |
79 | ||
80 | gw_node = container_of(ref, struct batadv_gw_node, refcount); | |
81 | ||
5d967310 | 82 | batadv_orig_node_put(gw_node->orig_node); |
e7aed321 SE |
83 | kfree_rcu(gw_node, rcu); |
84 | } | |
85 | ||
86 | /** | |
3a01743d | 87 | * batadv_gw_node_put - decrement the gw_node refcounter and possibly release it |
e7aed321 SE |
88 | * @gw_node: gateway node to free |
89 | */ | |
34d99cfe | 90 | void batadv_gw_node_put(struct batadv_gw_node *gw_node) |
c6c8fea2 | 91 | { |
e7aed321 | 92 | kref_put(&gw_node->refcount, batadv_gw_node_release); |
c6c8fea2 SE |
93 | } |
94 | ||
34d99cfe | 95 | struct batadv_gw_node * |
56303d34 | 96 | batadv_gw_get_selected_gw_node(struct batadv_priv *bat_priv) |
c6c8fea2 | 97 | { |
56303d34 | 98 | struct batadv_gw_node *gw_node; |
c6c8fea2 | 99 | |
5d02b3cd | 100 | rcu_read_lock(); |
807736f6 | 101 | gw_node = rcu_dereference(bat_priv->gw.curr_gw); |
c4aac1ab | 102 | if (!gw_node) |
7b36e8ee | 103 | goto out; |
c6c8fea2 | 104 | |
e7aed321 | 105 | if (!kref_get_unless_zero(&gw_node->refcount)) |
c4aac1ab | 106 | gw_node = NULL; |
43c70ad5 | 107 | |
5d02b3cd LL |
108 | out: |
109 | rcu_read_unlock(); | |
c4aac1ab | 110 | return gw_node; |
c6c8fea2 SE |
111 | } |
112 | ||
56303d34 SE |
113 | struct batadv_orig_node * |
114 | batadv_gw_get_selected_orig(struct batadv_priv *bat_priv) | |
c6c8fea2 | 115 | { |
56303d34 SE |
116 | struct batadv_gw_node *gw_node; |
117 | struct batadv_orig_node *orig_node = NULL; | |
c6c8fea2 | 118 | |
1409a834 | 119 | gw_node = batadv_gw_get_selected_gw_node(bat_priv); |
c4aac1ab ML |
120 | if (!gw_node) |
121 | goto out; | |
122 | ||
123 | rcu_read_lock(); | |
124 | orig_node = gw_node->orig_node; | |
125 | if (!orig_node) | |
126 | goto unlock; | |
127 | ||
7c124391 | 128 | if (!kref_get_unless_zero(&orig_node->refcount)) |
c4aac1ab | 129 | orig_node = NULL; |
c6c8fea2 | 130 | |
c4aac1ab ML |
131 | unlock: |
132 | rcu_read_unlock(); | |
133 | out: | |
c6c8fea2 | 134 | if (gw_node) |
3a01743d | 135 | batadv_gw_node_put(gw_node); |
c4aac1ab | 136 | return orig_node; |
c6c8fea2 SE |
137 | } |
138 | ||
56303d34 SE |
139 | static void batadv_gw_select(struct batadv_priv *bat_priv, |
140 | struct batadv_gw_node *new_gw_node) | |
c6c8fea2 | 141 | { |
56303d34 | 142 | struct batadv_gw_node *curr_gw_node; |
c6c8fea2 | 143 | |
807736f6 | 144 | spin_lock_bh(&bat_priv->gw.list_lock); |
c4aac1ab | 145 | |
a08d497d SE |
146 | if (new_gw_node) |
147 | kref_get(&new_gw_node->refcount); | |
c6c8fea2 | 148 | |
807736f6 SE |
149 | curr_gw_node = rcu_dereference_protected(bat_priv->gw.curr_gw, 1); |
150 | rcu_assign_pointer(bat_priv->gw.curr_gw, new_gw_node); | |
25b6d3c1 ML |
151 | |
152 | if (curr_gw_node) | |
3a01743d | 153 | batadv_gw_node_put(curr_gw_node); |
c4aac1ab | 154 | |
807736f6 | 155 | spin_unlock_bh(&bat_priv->gw.list_lock); |
c4aac1ab ML |
156 | } |
157 | ||
4e820e72 AQ |
158 | /** |
159 | * batadv_gw_reselect - force a gateway reselection | |
160 | * @bat_priv: the bat priv with all the soft interface information | |
161 | * | |
162 | * Set a flag to remind the GW component to perform a new gateway reselection. | |
163 | * However this function does not ensure that the current gateway is going to be | |
164 | * deselected. The reselection mechanism may elect the same gateway once again. | |
165 | * | |
166 | * This means that invoking batadv_gw_reselect() does not guarantee a gateway | |
167 | * change and therefore a uevent is not necessarily expected. | |
168 | */ | |
169 | void batadv_gw_reselect(struct batadv_priv *bat_priv) | |
c4aac1ab | 170 | { |
807736f6 | 171 | atomic_set(&bat_priv->gw.reselect, 1); |
c6c8fea2 SE |
172 | } |
173 | ||
c6eaa3f0 AQ |
174 | /** |
175 | * batadv_gw_check_client_stop - check if client mode has been switched off | |
176 | * @bat_priv: the bat priv with all the soft interface information | |
177 | * | |
178 | * This function assumes the caller has checked that the gw state *is actually | |
179 | * changing*. This function is not supposed to be called when there is no state | |
180 | * change. | |
181 | */ | |
182 | void batadv_gw_check_client_stop(struct batadv_priv *bat_priv) | |
183 | { | |
184 | struct batadv_gw_node *curr_gw; | |
185 | ||
3a24a63e | 186 | if (atomic_read(&bat_priv->gw.mode) != BATADV_GW_MODE_CLIENT) |
c6eaa3f0 AQ |
187 | return; |
188 | ||
189 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); | |
190 | if (!curr_gw) | |
191 | return; | |
192 | ||
f3163181 AQ |
193 | /* deselect the current gateway so that next time that client mode is |
194 | * enabled a proper GW_ADD event can be sent | |
195 | */ | |
196 | batadv_gw_select(bat_priv, NULL); | |
197 | ||
c6eaa3f0 AQ |
198 | /* if batman-adv is switching the gw client mode off and a gateway was |
199 | * already selected, send a DEL uevent | |
200 | */ | |
201 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL, NULL); | |
202 | ||
3a01743d | 203 | batadv_gw_node_put(curr_gw); |
c6eaa3f0 AQ |
204 | } |
205 | ||
56303d34 | 206 | void batadv_gw_election(struct batadv_priv *bat_priv) |
2265c141 | 207 | { |
4f248cff SE |
208 | struct batadv_gw_node *curr_gw = NULL; |
209 | struct batadv_gw_node *next_gw = NULL; | |
56303d34 | 210 | struct batadv_neigh_node *router = NULL; |
89652331 | 211 | struct batadv_neigh_ifinfo *router_ifinfo = NULL; |
19595e05 | 212 | char gw_addr[18] = { '\0' }; |
2265c141 | 213 | |
3a24a63e | 214 | if (atomic_read(&bat_priv->gw.mode) != BATADV_GW_MODE_CLIENT) |
2265c141 AQ |
215 | goto out; |
216 | ||
34d99cfe AQ |
217 | if (!bat_priv->algo_ops->gw.get_best_gw_node) |
218 | goto out; | |
219 | ||
1409a834 | 220 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
2265c141 | 221 | |
807736f6 | 222 | if (!batadv_atomic_dec_not_zero(&bat_priv->gw.reselect) && curr_gw) |
caa0bf64 ML |
223 | goto out; |
224 | ||
34d99cfe AQ |
225 | /* if gw.reselect is set to 1 it means that a previous call to |
226 | * gw.is_eligible() said that we have a new best GW, therefore it can | |
227 | * now be picked from the list and selected | |
228 | */ | |
229 | next_gw = bat_priv->algo_ops->gw.get_best_gw_node(bat_priv); | |
2265c141 AQ |
230 | |
231 | if (curr_gw == next_gw) | |
232 | goto out; | |
233 | ||
234 | if (next_gw) { | |
19595e05 AQ |
235 | sprintf(gw_addr, "%pM", next_gw->orig_node->orig); |
236 | ||
7351a482 SW |
237 | router = batadv_orig_router_get(next_gw->orig_node, |
238 | BATADV_IF_DEFAULT); | |
2265c141 | 239 | if (!router) { |
4e820e72 | 240 | batadv_gw_reselect(bat_priv); |
2265c141 AQ |
241 | goto out; |
242 | } | |
89652331 SW |
243 | |
244 | router_ifinfo = batadv_neigh_ifinfo_get(router, | |
245 | BATADV_IF_DEFAULT); | |
246 | if (!router_ifinfo) { | |
247 | batadv_gw_reselect(bat_priv); | |
248 | goto out; | |
249 | } | |
c6c8fea2 SE |
250 | } |
251 | ||
825ffe1f | 252 | if (curr_gw && !next_gw) { |
39c75a51 | 253 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 254 | "Removing selected gateway - no gateway in range\n"); |
39c75a51 SE |
255 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL, |
256 | NULL); | |
825ffe1f | 257 | } else if (!curr_gw && next_gw) { |
39c75a51 | 258 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
414254e3 | 259 | "Adding route to gateway %pM (bandwidth: %u.%u/%u.%u MBit, tq: %i)\n", |
1eda58bf | 260 | next_gw->orig_node->orig, |
414254e3 ML |
261 | next_gw->bandwidth_down / 10, |
262 | next_gw->bandwidth_down % 10, | |
263 | next_gw->bandwidth_up / 10, | |
89652331 SW |
264 | next_gw->bandwidth_up % 10, |
265 | router_ifinfo->bat_iv.tq_avg); | |
39c75a51 SE |
266 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_ADD, |
267 | gw_addr); | |
2265c141 | 268 | } else { |
39c75a51 | 269 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
414254e3 | 270 | "Changing route to gateway %pM (bandwidth: %u.%u/%u.%u MBit, tq: %i)\n", |
1eda58bf | 271 | next_gw->orig_node->orig, |
414254e3 ML |
272 | next_gw->bandwidth_down / 10, |
273 | next_gw->bandwidth_down % 10, | |
274 | next_gw->bandwidth_up / 10, | |
89652331 SW |
275 | next_gw->bandwidth_up % 10, |
276 | router_ifinfo->bat_iv.tq_avg); | |
39c75a51 SE |
277 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_CHANGE, |
278 | gw_addr); | |
2265c141 AQ |
279 | } |
280 | ||
1409a834 | 281 | batadv_gw_select(bat_priv, next_gw); |
2265c141 | 282 | |
c4aac1ab ML |
283 | out: |
284 | if (curr_gw) | |
3a01743d | 285 | batadv_gw_node_put(curr_gw); |
2265c141 | 286 | if (next_gw) |
3a01743d | 287 | batadv_gw_node_put(next_gw); |
2265c141 | 288 | if (router) |
25bb2509 | 289 | batadv_neigh_node_put(router); |
89652331 | 290 | if (router_ifinfo) |
044fa3ae | 291 | batadv_neigh_ifinfo_put(router_ifinfo); |
c6c8fea2 SE |
292 | } |
293 | ||
56303d34 SE |
294 | void batadv_gw_check_election(struct batadv_priv *bat_priv, |
295 | struct batadv_orig_node *orig_node) | |
c6c8fea2 | 296 | { |
56303d34 | 297 | struct batadv_orig_node *curr_gw_orig; |
34d99cfe AQ |
298 | |
299 | /* abort immediately if the routing algorithm does not support gateway | |
300 | * election | |
301 | */ | |
302 | if (!bat_priv->algo_ops->gw.is_eligible) | |
303 | return; | |
c6c8fea2 | 304 | |
7cf06bc6 | 305 | curr_gw_orig = batadv_gw_get_selected_orig(bat_priv); |
57f0c07c | 306 | if (!curr_gw_orig) |
4e820e72 | 307 | goto reselect; |
c6c8fea2 | 308 | |
c6c8fea2 | 309 | /* this node already is the gateway */ |
57f0c07c | 310 | if (curr_gw_orig == orig_node) |
e1a5382f | 311 | goto out; |
c6c8fea2 | 312 | |
34d99cfe AQ |
313 | if (!bat_priv->algo_ops->gw.is_eligible(bat_priv, curr_gw_orig, |
314 | orig_node)) | |
e1a5382f | 315 | goto out; |
5d02b3cd | 316 | |
4e820e72 AQ |
317 | reselect: |
318 | batadv_gw_reselect(bat_priv); | |
5d02b3cd | 319 | out: |
57f0c07c | 320 | if (curr_gw_orig) |
5d967310 | 321 | batadv_orig_node_put(curr_gw_orig); |
c6c8fea2 SE |
322 | } |
323 | ||
414254e3 ML |
324 | /** |
325 | * batadv_gw_node_add - add gateway node to list of available gateways | |
326 | * @bat_priv: the bat priv with all the soft interface information | |
327 | * @orig_node: originator announcing gateway capabilities | |
328 | * @gateway: announced bandwidth information | |
90abeff5 SE |
329 | * |
330 | * Has to be called with the appropriate locks being acquired | |
331 | * (gw.list_lock). | |
414254e3 | 332 | */ |
56303d34 SE |
333 | static void batadv_gw_node_add(struct batadv_priv *bat_priv, |
334 | struct batadv_orig_node *orig_node, | |
414254e3 | 335 | struct batadv_tvlv_gateway_data *gateway) |
c6c8fea2 | 336 | { |
56303d34 | 337 | struct batadv_gw_node *gw_node; |
414254e3 | 338 | |
90abeff5 SE |
339 | lockdep_assert_held(&bat_priv->gw.list_lock); |
340 | ||
414254e3 ML |
341 | if (gateway->bandwidth_down == 0) |
342 | return; | |
c6c8fea2 | 343 | |
704509b8 | 344 | gw_node = kzalloc(sizeof(*gw_node), GFP_ATOMIC); |
c3ba37a7 | 345 | if (!gw_node) |
c6c8fea2 SE |
346 | return; |
347 | ||
f665fa7e | 348 | kref_init(&gw_node->refcount); |
c6c8fea2 | 349 | INIT_HLIST_NODE(&gw_node->list); |
55db2d59 | 350 | kref_get(&orig_node->refcount); |
c6c8fea2 | 351 | gw_node->orig_node = orig_node; |
27a4d5ef SW |
352 | gw_node->bandwidth_down = ntohl(gateway->bandwidth_down); |
353 | gw_node->bandwidth_up = ntohl(gateway->bandwidth_up); | |
c6c8fea2 | 354 | |
f665fa7e | 355 | kref_get(&gw_node->refcount); |
70ea5cee | 356 | hlist_add_head_rcu(&gw_node->list, &bat_priv->gw.gateway_list); |
c6c8fea2 | 357 | |
39c75a51 | 358 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
414254e3 ML |
359 | "Found new gateway %pM -> gw bandwidth: %u.%u/%u.%u MBit\n", |
360 | orig_node->orig, | |
361 | ntohl(gateway->bandwidth_down) / 10, | |
362 | ntohl(gateway->bandwidth_down) % 10, | |
363 | ntohl(gateway->bandwidth_up) / 10, | |
364 | ntohl(gateway->bandwidth_up) % 10); | |
f665fa7e SE |
365 | |
366 | /* don't return reference to new gw_node */ | |
367 | batadv_gw_node_put(gw_node); | |
c6c8fea2 SE |
368 | } |
369 | ||
414254e3 ML |
370 | /** |
371 | * batadv_gw_node_get - retrieve gateway node from list of available gateways | |
372 | * @bat_priv: the bat priv with all the soft interface information | |
373 | * @orig_node: originator announcing gateway capabilities | |
374 | * | |
62fe710f | 375 | * Return: gateway node if found or NULL otherwise. |
414254e3 | 376 | */ |
50164d8f AQ |
377 | struct batadv_gw_node *batadv_gw_node_get(struct batadv_priv *bat_priv, |
378 | struct batadv_orig_node *orig_node) | |
c6c8fea2 | 379 | { |
414254e3 | 380 | struct batadv_gw_node *gw_node_tmp, *gw_node = NULL; |
c6c8fea2 SE |
381 | |
382 | rcu_read_lock(); | |
70ea5cee SE |
383 | hlist_for_each_entry_rcu(gw_node_tmp, &bat_priv->gw.gateway_list, |
384 | list) { | |
414254e3 | 385 | if (gw_node_tmp->orig_node != orig_node) |
c6c8fea2 SE |
386 | continue; |
387 | ||
e7aed321 | 388 | if (!kref_get_unless_zero(&gw_node_tmp->refcount)) |
414254e3 | 389 | continue; |
c6c8fea2 | 390 | |
414254e3 ML |
391 | gw_node = gw_node_tmp; |
392 | break; | |
393 | } | |
394 | rcu_read_unlock(); | |
c6c8fea2 | 395 | |
414254e3 ML |
396 | return gw_node; |
397 | } | |
c6c8fea2 | 398 | |
414254e3 ML |
399 | /** |
400 | * batadv_gw_node_update - update list of available gateways with changed | |
401 | * bandwidth information | |
402 | * @bat_priv: the bat priv with all the soft interface information | |
403 | * @orig_node: originator announcing gateway capabilities | |
404 | * @gateway: announced bandwidth information | |
405 | */ | |
406 | void batadv_gw_node_update(struct batadv_priv *bat_priv, | |
407 | struct batadv_orig_node *orig_node, | |
408 | struct batadv_tvlv_gateway_data *gateway) | |
409 | { | |
410 | struct batadv_gw_node *gw_node, *curr_gw = NULL; | |
411 | ||
90abeff5 | 412 | spin_lock_bh(&bat_priv->gw.list_lock); |
414254e3 ML |
413 | gw_node = batadv_gw_node_get(bat_priv, orig_node); |
414 | if (!gw_node) { | |
415 | batadv_gw_node_add(bat_priv, orig_node, gateway); | |
90abeff5 | 416 | spin_unlock_bh(&bat_priv->gw.list_lock); |
414254e3 | 417 | goto out; |
c6c8fea2 | 418 | } |
90abeff5 | 419 | spin_unlock_bh(&bat_priv->gw.list_lock); |
c6c8fea2 | 420 | |
825ffe1f SE |
421 | if (gw_node->bandwidth_down == ntohl(gateway->bandwidth_down) && |
422 | gw_node->bandwidth_up == ntohl(gateway->bandwidth_up)) | |
414254e3 | 423 | goto out; |
c6c8fea2 | 424 | |
414254e3 ML |
425 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
426 | "Gateway bandwidth of originator %pM changed from %u.%u/%u.%u MBit to %u.%u/%u.%u MBit\n", | |
427 | orig_node->orig, | |
428 | gw_node->bandwidth_down / 10, | |
429 | gw_node->bandwidth_down % 10, | |
430 | gw_node->bandwidth_up / 10, | |
431 | gw_node->bandwidth_up % 10, | |
432 | ntohl(gateway->bandwidth_down) / 10, | |
433 | ntohl(gateway->bandwidth_down) % 10, | |
434 | ntohl(gateway->bandwidth_up) / 10, | |
435 | ntohl(gateway->bandwidth_up) % 10); | |
436 | ||
437 | gw_node->bandwidth_down = ntohl(gateway->bandwidth_down); | |
438 | gw_node->bandwidth_up = ntohl(gateway->bandwidth_up); | |
439 | ||
414254e3 | 440 | if (ntohl(gateway->bandwidth_down) == 0) { |
414254e3 ML |
441 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
442 | "Gateway %pM removed from gateway list\n", | |
443 | orig_node->orig); | |
c4aac1ab | 444 | |
414254e3 ML |
445 | /* Note: We don't need a NULL check here, since curr_gw never |
446 | * gets dereferenced. | |
447 | */ | |
bd3524c1 | 448 | spin_lock_bh(&bat_priv->gw.list_lock); |
c18bdd01 SE |
449 | if (!hlist_unhashed(&gw_node->list)) { |
450 | hlist_del_init_rcu(&gw_node->list); | |
3a01743d | 451 | batadv_gw_node_put(gw_node); |
c18bdd01 | 452 | } |
bd3524c1 SW |
453 | spin_unlock_bh(&bat_priv->gw.list_lock); |
454 | ||
414254e3 ML |
455 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
456 | if (gw_node == curr_gw) | |
4e820e72 | 457 | batadv_gw_reselect(bat_priv); |
bd3524c1 SW |
458 | |
459 | if (curr_gw) | |
3a01743d | 460 | batadv_gw_node_put(curr_gw); |
414254e3 | 461 | } |
71e4aa9c | 462 | |
414254e3 | 463 | out: |
414254e3 | 464 | if (gw_node) |
3a01743d | 465 | batadv_gw_node_put(gw_node); |
c6c8fea2 SE |
466 | } |
467 | ||
56303d34 SE |
468 | void batadv_gw_node_delete(struct batadv_priv *bat_priv, |
469 | struct batadv_orig_node *orig_node) | |
c6c8fea2 | 470 | { |
414254e3 ML |
471 | struct batadv_tvlv_gateway_data gateway; |
472 | ||
473 | gateway.bandwidth_down = 0; | |
474 | gateway.bandwidth_up = 0; | |
475 | ||
476 | batadv_gw_node_update(bat_priv, orig_node, &gateway); | |
c6c8fea2 SE |
477 | } |
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); |
c6c8fea2 | 489 | } |
807736f6 | 490 | spin_unlock_bh(&bat_priv->gw.list_lock); |
c6c8fea2 SE |
491 | } |
492 | ||
dc1cbd14 | 493 | #ifdef CONFIG_BATMAN_ADV_DEBUGFS |
7cf06bc6 | 494 | int batadv_gw_client_seq_print_text(struct seq_file *seq, void *offset) |
c6c8fea2 SE |
495 | { |
496 | struct net_device *net_dev = (struct net_device *)seq->private; | |
56303d34 SE |
497 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
498 | struct batadv_hard_iface *primary_if; | |
c6c8fea2 | 499 | |
30da63a6 ML |
500 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
501 | if (!primary_if) | |
34d99cfe | 502 | return 0; |
c6c8fea2 | 503 | |
34d99cfe | 504 | seq_printf(seq, "[B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s %s)]\n", |
42d0b044 | 505 | BATADV_SOURCE_VERSION, primary_if->net_dev->name, |
34d99cfe AQ |
506 | primary_if->net_dev->dev_addr, net_dev->name, |
507 | bat_priv->algo_ops->name); | |
c6c8fea2 | 508 | |
34d99cfe | 509 | batadv_hardif_put(primary_if); |
c6c8fea2 | 510 | |
34d99cfe AQ |
511 | if (!bat_priv->algo_ops->gw.print) { |
512 | seq_puts(seq, | |
513 | "No printing function for this routing protocol\n"); | |
514 | return 0; | |
c6c8fea2 | 515 | } |
c6c8fea2 | 516 | |
34d99cfe | 517 | bat_priv->algo_ops->gw.print(bat_priv, seq); |
c6c8fea2 | 518 | |
30da63a6 | 519 | return 0; |
c6c8fea2 | 520 | } |
dc1cbd14 | 521 | #endif |
c6c8fea2 | 522 | |
d7129daf SE |
523 | /** |
524 | * batadv_gw_dump - Dump gateways into a message | |
525 | * @msg: Netlink message to dump into | |
526 | * @cb: Control block containing additional options | |
527 | * | |
528 | * Return: Error code, or length of message | |
529 | */ | |
530 | int batadv_gw_dump(struct sk_buff *msg, struct netlink_callback *cb) | |
531 | { | |
532 | struct batadv_hard_iface *primary_if = NULL; | |
533 | struct net *net = sock_net(cb->skb->sk); | |
534 | struct net_device *soft_iface; | |
535 | struct batadv_priv *bat_priv; | |
536 | int ifindex; | |
537 | int ret; | |
538 | ||
539 | ifindex = batadv_netlink_get_ifindex(cb->nlh, | |
540 | BATADV_ATTR_MESH_IFINDEX); | |
541 | if (!ifindex) | |
542 | return -EINVAL; | |
543 | ||
544 | soft_iface = dev_get_by_index(net, ifindex); | |
545 | if (!soft_iface || !batadv_softif_is_valid(soft_iface)) { | |
546 | ret = -ENODEV; | |
547 | goto out; | |
548 | } | |
549 | ||
550 | bat_priv = netdev_priv(soft_iface); | |
551 | ||
552 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
553 | if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) { | |
554 | ret = -ENOENT; | |
555 | goto out; | |
556 | } | |
557 | ||
558 | if (!bat_priv->algo_ops->gw.dump) { | |
559 | ret = -EOPNOTSUPP; | |
560 | goto out; | |
561 | } | |
562 | ||
563 | bat_priv->algo_ops->gw.dump(msg, cb, bat_priv); | |
564 | ||
565 | ret = msg->len; | |
566 | ||
567 | out: | |
568 | if (primary_if) | |
569 | batadv_hardif_put(primary_if); | |
570 | if (soft_iface) | |
571 | dev_put(soft_iface); | |
572 | ||
573 | return ret; | |
574 | } | |
575 | ||
6c413b1c AQ |
576 | /** |
577 | * batadv_gw_dhcp_recipient_get - check if a packet is a DHCP message | |
578 | * @skb: the packet to check | |
579 | * @header_len: a pointer to the batman-adv header size | |
580 | * @chaddr: buffer where the client address will be stored. Valid | |
581 | * only if the function returns BATADV_DHCP_TO_CLIENT | |
582 | * | |
62fe710f SE |
583 | * This function may re-allocate the data buffer of the skb passed as argument. |
584 | * | |
585 | * Return: | |
6c413b1c AQ |
586 | * - BATADV_DHCP_NO if the packet is not a dhcp message or if there was an error |
587 | * while parsing it | |
588 | * - BATADV_DHCP_TO_SERVER if this is a message going to the DHCP server | |
589 | * - BATADV_DHCP_TO_CLIENT if this is a message going to a DHCP client | |
6c413b1c AQ |
590 | */ |
591 | enum batadv_dhcp_recipient | |
592 | batadv_gw_dhcp_recipient_get(struct sk_buff *skb, unsigned int *header_len, | |
6b5e971a | 593 | u8 *chaddr) |
c6c8fea2 | 594 | { |
6c413b1c | 595 | enum batadv_dhcp_recipient ret = BATADV_DHCP_NO; |
c6c8fea2 SE |
596 | struct ethhdr *ethhdr; |
597 | struct iphdr *iphdr; | |
598 | struct ipv6hdr *ipv6hdr; | |
599 | struct udphdr *udphdr; | |
f7f8ed56 | 600 | struct vlan_ethhdr *vhdr; |
6c413b1c | 601 | int chaddr_offset; |
f7f8ed56 | 602 | __be16 proto; |
6b5e971a | 603 | u8 *p; |
c6c8fea2 SE |
604 | |
605 | /* check for ethernet header */ | |
be7af5cf | 606 | if (!pskb_may_pull(skb, *header_len + ETH_HLEN)) |
6c413b1c AQ |
607 | return BATADV_DHCP_NO; |
608 | ||
927c2ed7 | 609 | ethhdr = eth_hdr(skb); |
f7f8ed56 | 610 | proto = ethhdr->h_proto; |
be7af5cf | 611 | *header_len += ETH_HLEN; |
c6c8fea2 SE |
612 | |
613 | /* check for initial vlan header */ | |
f7f8ed56 | 614 | if (proto == htons(ETH_P_8021Q)) { |
be7af5cf | 615 | if (!pskb_may_pull(skb, *header_len + VLAN_HLEN)) |
6c413b1c | 616 | return BATADV_DHCP_NO; |
f7f8ed56 | 617 | |
927c2ed7 | 618 | vhdr = vlan_eth_hdr(skb); |
f7f8ed56 | 619 | proto = vhdr->h_vlan_encapsulated_proto; |
be7af5cf | 620 | *header_len += VLAN_HLEN; |
c6c8fea2 SE |
621 | } |
622 | ||
623 | /* check for ip header */ | |
f7f8ed56 AQ |
624 | switch (proto) { |
625 | case htons(ETH_P_IP): | |
be7af5cf | 626 | if (!pskb_may_pull(skb, *header_len + sizeof(*iphdr))) |
6c413b1c AQ |
627 | return BATADV_DHCP_NO; |
628 | ||
be7af5cf ML |
629 | iphdr = (struct iphdr *)(skb->data + *header_len); |
630 | *header_len += iphdr->ihl * 4; | |
c6c8fea2 SE |
631 | |
632 | /* check for udp header */ | |
633 | if (iphdr->protocol != IPPROTO_UDP) | |
6c413b1c | 634 | return BATADV_DHCP_NO; |
c6c8fea2 SE |
635 | |
636 | break; | |
f7f8ed56 | 637 | case htons(ETH_P_IPV6): |
be7af5cf | 638 | if (!pskb_may_pull(skb, *header_len + sizeof(*ipv6hdr))) |
6c413b1c AQ |
639 | return BATADV_DHCP_NO; |
640 | ||
be7af5cf ML |
641 | ipv6hdr = (struct ipv6hdr *)(skb->data + *header_len); |
642 | *header_len += sizeof(*ipv6hdr); | |
c6c8fea2 SE |
643 | |
644 | /* check for udp header */ | |
645 | if (ipv6hdr->nexthdr != IPPROTO_UDP) | |
6c413b1c | 646 | return BATADV_DHCP_NO; |
c6c8fea2 SE |
647 | |
648 | break; | |
649 | default: | |
6c413b1c | 650 | return BATADV_DHCP_NO; |
c6c8fea2 SE |
651 | } |
652 | ||
be7af5cf | 653 | if (!pskb_may_pull(skb, *header_len + sizeof(*udphdr))) |
6c413b1c | 654 | return BATADV_DHCP_NO; |
9d2c9488 | 655 | |
be7af5cf ML |
656 | udphdr = (struct udphdr *)(skb->data + *header_len); |
657 | *header_len += sizeof(*udphdr); | |
c6c8fea2 SE |
658 | |
659 | /* check for bootp port */ | |
6c413b1c AQ |
660 | switch (proto) { |
661 | case htons(ETH_P_IP): | |
662 | if (udphdr->dest == htons(67)) | |
663 | ret = BATADV_DHCP_TO_SERVER; | |
664 | else if (udphdr->source == htons(67)) | |
665 | ret = BATADV_DHCP_TO_CLIENT; | |
666 | break; | |
667 | case htons(ETH_P_IPV6): | |
668 | if (udphdr->dest == htons(547)) | |
669 | ret = BATADV_DHCP_TO_SERVER; | |
670 | else if (udphdr->source == htons(547)) | |
671 | ret = BATADV_DHCP_TO_CLIENT; | |
672 | break; | |
673 | } | |
c6c8fea2 | 674 | |
6c413b1c AQ |
675 | chaddr_offset = *header_len + BATADV_DHCP_CHADDR_OFFSET; |
676 | /* store the client address if the message is going to a client */ | |
677 | if (ret == BATADV_DHCP_TO_CLIENT && | |
678 | pskb_may_pull(skb, chaddr_offset + ETH_ALEN)) { | |
679 | /* check if the DHCP packet carries an Ethernet DHCP */ | |
680 | p = skb->data + *header_len + BATADV_DHCP_HTYPE_OFFSET; | |
681 | if (*p != BATADV_DHCP_HTYPE_ETHERNET) | |
682 | return BATADV_DHCP_NO; | |
683 | ||
684 | /* check if the DHCP packet carries a valid Ethernet address */ | |
685 | p = skb->data + *header_len + BATADV_DHCP_HLEN_OFFSET; | |
686 | if (*p != ETH_ALEN) | |
687 | return BATADV_DHCP_NO; | |
688 | ||
8fdd0153 | 689 | ether_addr_copy(chaddr, skb->data + chaddr_offset); |
6c413b1c | 690 | } |
c6c8fea2 | 691 | |
6c413b1c | 692 | return ret; |
be7af5cf | 693 | } |
aa143d28 | 694 | |
bbb877ed AQ |
695 | /** |
696 | * batadv_gw_out_of_range - check if the dhcp request destination is the best gw | |
697 | * @bat_priv: the bat priv with all the soft interface information | |
698 | * @skb: the outgoing packet | |
699 | * | |
700 | * Check if the skb is a DHCP request and if it is sent to the current best GW | |
701 | * server. Due to topology changes it may be the case that the GW server | |
702 | * previously selected is not the best one anymore. | |
703 | * | |
bbb877ed | 704 | * This call might reallocate skb data. |
6c413b1c | 705 | * Must be invoked only when the DHCP packet is going TO a DHCP SERVER. |
62fe710f SE |
706 | * |
707 | * Return: true if the packet destination is unicast and it is not the best gw, | |
708 | * false otherwise. | |
bbb877ed | 709 | */ |
56303d34 | 710 | bool batadv_gw_out_of_range(struct batadv_priv *bat_priv, |
9d2c9488 | 711 | struct sk_buff *skb) |
be7af5cf | 712 | { |
4f248cff SE |
713 | struct batadv_neigh_node *neigh_curr = NULL; |
714 | struct batadv_neigh_node *neigh_old = NULL; | |
c74f6913 | 715 | struct batadv_orig_node *orig_dst_node = NULL; |
4f248cff SE |
716 | struct batadv_gw_node *gw_node = NULL; |
717 | struct batadv_gw_node *curr_gw = NULL; | |
89652331 | 718 | struct batadv_neigh_ifinfo *curr_ifinfo, *old_ifinfo; |
6c413b1c AQ |
719 | struct ethhdr *ethhdr = (struct ethhdr *)skb->data; |
720 | bool out_of_range = false; | |
6b5e971a | 721 | u8 curr_tq_avg; |
bbb877ed AQ |
722 | unsigned short vid; |
723 | ||
724 | vid = batadv_get_vid(skb, 0); | |
be7af5cf | 725 | |
c74f6913 LL |
726 | if (is_multicast_ether_addr(ethhdr->h_dest)) |
727 | goto out; | |
728 | ||
08c36d3e | 729 | orig_dst_node = batadv_transtable_search(bat_priv, ethhdr->h_source, |
bbb877ed | 730 | ethhdr->h_dest, vid); |
be7af5cf ML |
731 | if (!orig_dst_node) |
732 | goto out; | |
733 | ||
414254e3 | 734 | gw_node = batadv_gw_node_get(bat_priv, orig_dst_node); |
0d164491 | 735 | if (!gw_node) |
be7af5cf ML |
736 | goto out; |
737 | ||
3a24a63e | 738 | switch (atomic_read(&bat_priv->gw.mode)) { |
cd646ab1 | 739 | case BATADV_GW_MODE_SERVER: |
be7af5cf | 740 | /* If we are a GW then we are our best GW. We can artificially |
9cfc7bd6 SE |
741 | * set the tq towards ourself as the maximum value |
742 | */ | |
42d0b044 | 743 | curr_tq_avg = BATADV_TQ_MAX_VALUE; |
be7af5cf | 744 | break; |
cd646ab1 | 745 | case BATADV_GW_MODE_CLIENT: |
1409a834 | 746 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
be7af5cf ML |
747 | if (!curr_gw) |
748 | goto out; | |
749 | ||
750 | /* packet is going to our gateway */ | |
751 | if (curr_gw->orig_node == orig_dst_node) | |
752 | goto out; | |
753 | ||
754 | /* If the dhcp packet has been sent to a different gw, | |
755 | * we have to evaluate whether the old gw is still | |
9cfc7bd6 SE |
756 | * reliable enough |
757 | */ | |
30d3c511 SE |
758 | neigh_curr = batadv_find_router(bat_priv, curr_gw->orig_node, |
759 | NULL); | |
be7af5cf ML |
760 | if (!neigh_curr) |
761 | goto out; | |
762 | ||
89652331 SW |
763 | curr_ifinfo = batadv_neigh_ifinfo_get(neigh_curr, |
764 | BATADV_IF_DEFAULT); | |
765 | if (!curr_ifinfo) | |
766 | goto out; | |
767 | ||
768 | curr_tq_avg = curr_ifinfo->bat_iv.tq_avg; | |
044fa3ae | 769 | batadv_neigh_ifinfo_put(curr_ifinfo); |
89652331 | 770 | |
be7af5cf | 771 | break; |
cd646ab1 | 772 | case BATADV_GW_MODE_OFF: |
be7af5cf ML |
773 | default: |
774 | goto out; | |
43676ab5 | 775 | } |
be7af5cf | 776 | |
30d3c511 | 777 | neigh_old = batadv_find_router(bat_priv, orig_dst_node, NULL); |
2ef04f47 | 778 | if (!neigh_old) |
be7af5cf ML |
779 | goto out; |
780 | ||
89652331 SW |
781 | old_ifinfo = batadv_neigh_ifinfo_get(neigh_old, BATADV_IF_DEFAULT); |
782 | if (!old_ifinfo) | |
783 | goto out; | |
784 | ||
785 | if ((curr_tq_avg - old_ifinfo->bat_iv.tq_avg) > BATADV_GW_THRESHOLD) | |
be7af5cf | 786 | out_of_range = true; |
044fa3ae | 787 | batadv_neigh_ifinfo_put(old_ifinfo); |
be7af5cf ML |
788 | |
789 | out: | |
790 | if (orig_dst_node) | |
5d967310 | 791 | batadv_orig_node_put(orig_dst_node); |
be7af5cf | 792 | if (curr_gw) |
3a01743d | 793 | batadv_gw_node_put(curr_gw); |
414254e3 | 794 | if (gw_node) |
3a01743d | 795 | batadv_gw_node_put(gw_node); |
43676ab5 | 796 | if (neigh_old) |
25bb2509 | 797 | batadv_neigh_node_put(neigh_old); |
43676ab5 | 798 | if (neigh_curr) |
25bb2509 | 799 | batadv_neigh_node_put(neigh_curr); |
be7af5cf | 800 | return out_of_range; |
c6c8fea2 | 801 | } |