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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 SE |
33 | #include <linux/list.h> |
34 | #include <linux/netdevice.h> | |
d7129daf | 35 | #include <linux/netlink.h> |
1e2c2a4f SE |
36 | #include <linux/rculist.h> |
37 | #include <linux/rcupdate.h> | |
38 | #include <linux/seq_file.h> | |
39 | #include <linux/skbuff.h> | |
40 | #include <linux/slab.h> | |
41 | #include <linux/spinlock.h> | |
42 | #include <linux/stddef.h> | |
43 | #include <linux/udp.h> | |
d7129daf SE |
44 | #include <net/sock.h> |
45 | #include <uapi/linux/batman_adv.h> | |
1e2c2a4f | 46 | |
c6c8fea2 SE |
47 | #include "gateway_common.h" |
48 | #include "hard-interface.h" | |
ba412080 | 49 | #include "log.h" |
d7129daf | 50 | #include "netlink.h" |
57f0c07c | 51 | #include "originator.h" |
1e2c2a4f | 52 | #include "packet.h" |
43676ab5 | 53 | #include "routing.h" |
d7129daf | 54 | #include "soft-interface.h" |
1e2c2a4f SE |
55 | #include "sysfs.h" |
56 | #include "translation-table.h" | |
c6c8fea2 | 57 | |
6c413b1c AQ |
58 | /* These are the offsets of the "hw type" and "hw address length" in the dhcp |
59 | * packet starting at the beginning of the dhcp header | |
9cfc7bd6 | 60 | */ |
6c413b1c AQ |
61 | #define BATADV_DHCP_HTYPE_OFFSET 1 |
62 | #define BATADV_DHCP_HLEN_OFFSET 2 | |
63 | /* Value of htype representing Ethernet */ | |
64 | #define BATADV_DHCP_HTYPE_ETHERNET 0x01 | |
65 | /* This is the offset of the "chaddr" field in the dhcp packet starting at the | |
66 | * beginning of the dhcp header | |
67 | */ | |
68 | #define BATADV_DHCP_CHADDR_OFFSET 28 | |
43676ab5 | 69 | |
e7aed321 SE |
70 | /** |
71 | * batadv_gw_node_release - release gw_node from lists and queue for free after | |
72 | * rcu grace period | |
73 | * @ref: kref pointer of the gw_node | |
74 | */ | |
75 | static void batadv_gw_node_release(struct kref *ref) | |
76 | { | |
77 | struct batadv_gw_node *gw_node; | |
78 | ||
79 | gw_node = container_of(ref, struct batadv_gw_node, refcount); | |
80 | ||
5d967310 | 81 | batadv_orig_node_put(gw_node->orig_node); |
e7aed321 SE |
82 | kfree_rcu(gw_node, rcu); |
83 | } | |
84 | ||
85 | /** | |
3a01743d | 86 | * batadv_gw_node_put - decrement the gw_node refcounter and possibly release it |
e7aed321 SE |
87 | * @gw_node: gateway node to free |
88 | */ | |
34d99cfe | 89 | void batadv_gw_node_put(struct batadv_gw_node *gw_node) |
c6c8fea2 | 90 | { |
e7aed321 | 91 | kref_put(&gw_node->refcount, batadv_gw_node_release); |
c6c8fea2 SE |
92 | } |
93 | ||
34d99cfe | 94 | struct batadv_gw_node * |
56303d34 | 95 | batadv_gw_get_selected_gw_node(struct batadv_priv *bat_priv) |
c6c8fea2 | 96 | { |
56303d34 | 97 | struct batadv_gw_node *gw_node; |
c6c8fea2 | 98 | |
5d02b3cd | 99 | rcu_read_lock(); |
807736f6 | 100 | gw_node = rcu_dereference(bat_priv->gw.curr_gw); |
c4aac1ab | 101 | if (!gw_node) |
7b36e8ee | 102 | goto out; |
c6c8fea2 | 103 | |
e7aed321 | 104 | if (!kref_get_unless_zero(&gw_node->refcount)) |
c4aac1ab | 105 | gw_node = NULL; |
43c70ad5 | 106 | |
5d02b3cd LL |
107 | out: |
108 | rcu_read_unlock(); | |
c4aac1ab | 109 | return gw_node; |
c6c8fea2 SE |
110 | } |
111 | ||
56303d34 SE |
112 | struct batadv_orig_node * |
113 | batadv_gw_get_selected_orig(struct batadv_priv *bat_priv) | |
c6c8fea2 | 114 | { |
56303d34 SE |
115 | struct batadv_gw_node *gw_node; |
116 | struct batadv_orig_node *orig_node = NULL; | |
c6c8fea2 | 117 | |
1409a834 | 118 | gw_node = batadv_gw_get_selected_gw_node(bat_priv); |
c4aac1ab ML |
119 | if (!gw_node) |
120 | goto out; | |
121 | ||
122 | rcu_read_lock(); | |
123 | orig_node = gw_node->orig_node; | |
124 | if (!orig_node) | |
125 | goto unlock; | |
126 | ||
7c124391 | 127 | if (!kref_get_unless_zero(&orig_node->refcount)) |
c4aac1ab | 128 | orig_node = NULL; |
c6c8fea2 | 129 | |
c4aac1ab ML |
130 | unlock: |
131 | rcu_read_unlock(); | |
132 | out: | |
c6c8fea2 | 133 | if (gw_node) |
3a01743d | 134 | batadv_gw_node_put(gw_node); |
c4aac1ab | 135 | return orig_node; |
c6c8fea2 SE |
136 | } |
137 | ||
56303d34 SE |
138 | static void batadv_gw_select(struct batadv_priv *bat_priv, |
139 | struct batadv_gw_node *new_gw_node) | |
c6c8fea2 | 140 | { |
56303d34 | 141 | struct batadv_gw_node *curr_gw_node; |
c6c8fea2 | 142 | |
807736f6 | 143 | spin_lock_bh(&bat_priv->gw.list_lock); |
c4aac1ab | 144 | |
a08d497d SE |
145 | if (new_gw_node) |
146 | kref_get(&new_gw_node->refcount); | |
c6c8fea2 | 147 | |
807736f6 SE |
148 | curr_gw_node = rcu_dereference_protected(bat_priv->gw.curr_gw, 1); |
149 | rcu_assign_pointer(bat_priv->gw.curr_gw, new_gw_node); | |
25b6d3c1 ML |
150 | |
151 | if (curr_gw_node) | |
3a01743d | 152 | batadv_gw_node_put(curr_gw_node); |
c4aac1ab | 153 | |
807736f6 | 154 | spin_unlock_bh(&bat_priv->gw.list_lock); |
c4aac1ab ML |
155 | } |
156 | ||
4e820e72 AQ |
157 | /** |
158 | * batadv_gw_reselect - force a gateway reselection | |
159 | * @bat_priv: the bat priv with all the soft interface information | |
160 | * | |
161 | * Set a flag to remind the GW component to perform a new gateway reselection. | |
162 | * However this function does not ensure that the current gateway is going to be | |
163 | * deselected. The reselection mechanism may elect the same gateway once again. | |
164 | * | |
165 | * This means that invoking batadv_gw_reselect() does not guarantee a gateway | |
166 | * change and therefore a uevent is not necessarily expected. | |
167 | */ | |
168 | void batadv_gw_reselect(struct batadv_priv *bat_priv) | |
c4aac1ab | 169 | { |
807736f6 | 170 | atomic_set(&bat_priv->gw.reselect, 1); |
c6c8fea2 SE |
171 | } |
172 | ||
c6eaa3f0 AQ |
173 | /** |
174 | * batadv_gw_check_client_stop - check if client mode has been switched off | |
175 | * @bat_priv: the bat priv with all the soft interface information | |
176 | * | |
177 | * This function assumes the caller has checked that the gw state *is actually | |
178 | * changing*. This function is not supposed to be called when there is no state | |
179 | * change. | |
180 | */ | |
181 | void batadv_gw_check_client_stop(struct batadv_priv *bat_priv) | |
182 | { | |
183 | struct batadv_gw_node *curr_gw; | |
184 | ||
3a24a63e | 185 | if (atomic_read(&bat_priv->gw.mode) != BATADV_GW_MODE_CLIENT) |
c6eaa3f0 AQ |
186 | return; |
187 | ||
188 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); | |
189 | if (!curr_gw) | |
190 | return; | |
191 | ||
f3163181 AQ |
192 | /* deselect the current gateway so that next time that client mode is |
193 | * enabled a proper GW_ADD event can be sent | |
194 | */ | |
195 | batadv_gw_select(bat_priv, NULL); | |
196 | ||
c6eaa3f0 AQ |
197 | /* if batman-adv is switching the gw client mode off and a gateway was |
198 | * already selected, send a DEL uevent | |
199 | */ | |
200 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL, NULL); | |
201 | ||
3a01743d | 202 | batadv_gw_node_put(curr_gw); |
c6eaa3f0 AQ |
203 | } |
204 | ||
56303d34 | 205 | void batadv_gw_election(struct batadv_priv *bat_priv) |
2265c141 | 206 | { |
4f248cff SE |
207 | struct batadv_gw_node *curr_gw = NULL; |
208 | struct batadv_gw_node *next_gw = NULL; | |
56303d34 | 209 | struct batadv_neigh_node *router = NULL; |
89652331 | 210 | struct batadv_neigh_ifinfo *router_ifinfo = NULL; |
19595e05 | 211 | char gw_addr[18] = { '\0' }; |
2265c141 | 212 | |
3a24a63e | 213 | if (atomic_read(&bat_priv->gw.mode) != BATADV_GW_MODE_CLIENT) |
2265c141 AQ |
214 | goto out; |
215 | ||
34d99cfe AQ |
216 | if (!bat_priv->algo_ops->gw.get_best_gw_node) |
217 | goto out; | |
218 | ||
1409a834 | 219 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
2265c141 | 220 | |
807736f6 | 221 | if (!batadv_atomic_dec_not_zero(&bat_priv->gw.reselect) && curr_gw) |
caa0bf64 ML |
222 | goto out; |
223 | ||
34d99cfe AQ |
224 | /* if gw.reselect is set to 1 it means that a previous call to |
225 | * gw.is_eligible() said that we have a new best GW, therefore it can | |
226 | * now be picked from the list and selected | |
227 | */ | |
228 | next_gw = bat_priv->algo_ops->gw.get_best_gw_node(bat_priv); | |
2265c141 AQ |
229 | |
230 | if (curr_gw == next_gw) | |
231 | goto out; | |
232 | ||
233 | if (next_gw) { | |
19595e05 AQ |
234 | sprintf(gw_addr, "%pM", next_gw->orig_node->orig); |
235 | ||
7351a482 SW |
236 | router = batadv_orig_router_get(next_gw->orig_node, |
237 | BATADV_IF_DEFAULT); | |
2265c141 | 238 | if (!router) { |
4e820e72 | 239 | batadv_gw_reselect(bat_priv); |
2265c141 AQ |
240 | goto out; |
241 | } | |
89652331 SW |
242 | |
243 | router_ifinfo = batadv_neigh_ifinfo_get(router, | |
244 | BATADV_IF_DEFAULT); | |
245 | if (!router_ifinfo) { | |
246 | batadv_gw_reselect(bat_priv); | |
247 | goto out; | |
248 | } | |
c6c8fea2 SE |
249 | } |
250 | ||
2265c141 | 251 | if ((curr_gw) && (!next_gw)) { |
39c75a51 | 252 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 253 | "Removing selected gateway - no gateway in range\n"); |
39c75a51 SE |
254 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL, |
255 | NULL); | |
2265c141 | 256 | } else if ((!curr_gw) && (next_gw)) { |
39c75a51 | 257 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
414254e3 | 258 | "Adding route to gateway %pM (bandwidth: %u.%u/%u.%u MBit, tq: %i)\n", |
1eda58bf | 259 | next_gw->orig_node->orig, |
414254e3 ML |
260 | next_gw->bandwidth_down / 10, |
261 | next_gw->bandwidth_down % 10, | |
262 | next_gw->bandwidth_up / 10, | |
89652331 SW |
263 | next_gw->bandwidth_up % 10, |
264 | router_ifinfo->bat_iv.tq_avg); | |
39c75a51 SE |
265 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_ADD, |
266 | gw_addr); | |
2265c141 | 267 | } else { |
39c75a51 | 268 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
414254e3 | 269 | "Changing route to gateway %pM (bandwidth: %u.%u/%u.%u MBit, tq: %i)\n", |
1eda58bf | 270 | next_gw->orig_node->orig, |
414254e3 ML |
271 | next_gw->bandwidth_down / 10, |
272 | next_gw->bandwidth_down % 10, | |
273 | next_gw->bandwidth_up / 10, | |
89652331 SW |
274 | next_gw->bandwidth_up % 10, |
275 | router_ifinfo->bat_iv.tq_avg); | |
39c75a51 SE |
276 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_CHANGE, |
277 | gw_addr); | |
2265c141 AQ |
278 | } |
279 | ||
1409a834 | 280 | batadv_gw_select(bat_priv, next_gw); |
2265c141 | 281 | |
c4aac1ab ML |
282 | out: |
283 | if (curr_gw) | |
3a01743d | 284 | batadv_gw_node_put(curr_gw); |
2265c141 | 285 | if (next_gw) |
3a01743d | 286 | batadv_gw_node_put(next_gw); |
2265c141 | 287 | if (router) |
25bb2509 | 288 | batadv_neigh_node_put(router); |
89652331 | 289 | if (router_ifinfo) |
044fa3ae | 290 | batadv_neigh_ifinfo_put(router_ifinfo); |
c6c8fea2 SE |
291 | } |
292 | ||
56303d34 SE |
293 | void batadv_gw_check_election(struct batadv_priv *bat_priv, |
294 | struct batadv_orig_node *orig_node) | |
c6c8fea2 | 295 | { |
56303d34 | 296 | struct batadv_orig_node *curr_gw_orig; |
34d99cfe AQ |
297 | |
298 | /* abort immediately if the routing algorithm does not support gateway | |
299 | * election | |
300 | */ | |
301 | if (!bat_priv->algo_ops->gw.is_eligible) | |
302 | return; | |
c6c8fea2 | 303 | |
7cf06bc6 | 304 | curr_gw_orig = batadv_gw_get_selected_orig(bat_priv); |
57f0c07c | 305 | if (!curr_gw_orig) |
4e820e72 | 306 | goto reselect; |
c6c8fea2 | 307 | |
c6c8fea2 | 308 | /* this node already is the gateway */ |
57f0c07c | 309 | if (curr_gw_orig == orig_node) |
e1a5382f | 310 | goto out; |
c6c8fea2 | 311 | |
34d99cfe AQ |
312 | if (!bat_priv->algo_ops->gw.is_eligible(bat_priv, curr_gw_orig, |
313 | orig_node)) | |
e1a5382f | 314 | goto out; |
5d02b3cd | 315 | |
4e820e72 AQ |
316 | reselect: |
317 | batadv_gw_reselect(bat_priv); | |
5d02b3cd | 318 | out: |
57f0c07c | 319 | if (curr_gw_orig) |
5d967310 | 320 | batadv_orig_node_put(curr_gw_orig); |
c6c8fea2 SE |
321 | } |
322 | ||
414254e3 ML |
323 | /** |
324 | * batadv_gw_node_add - add gateway node to list of available gateways | |
325 | * @bat_priv: the bat priv with all the soft interface information | |
326 | * @orig_node: originator announcing gateway capabilities | |
327 | * @gateway: announced bandwidth information | |
328 | */ | |
56303d34 SE |
329 | static void batadv_gw_node_add(struct batadv_priv *bat_priv, |
330 | struct batadv_orig_node *orig_node, | |
414254e3 | 331 | struct batadv_tvlv_gateway_data *gateway) |
c6c8fea2 | 332 | { |
56303d34 | 333 | struct batadv_gw_node *gw_node; |
414254e3 ML |
334 | |
335 | if (gateway->bandwidth_down == 0) | |
336 | return; | |
c6c8fea2 | 337 | |
704509b8 | 338 | gw_node = kzalloc(sizeof(*gw_node), GFP_ATOMIC); |
c3ba37a7 | 339 | if (!gw_node) |
c6c8fea2 SE |
340 | return; |
341 | ||
f665fa7e | 342 | kref_init(&gw_node->refcount); |
c6c8fea2 | 343 | INIT_HLIST_NODE(&gw_node->list); |
55db2d59 | 344 | kref_get(&orig_node->refcount); |
c6c8fea2 | 345 | gw_node->orig_node = orig_node; |
27a4d5ef SW |
346 | gw_node->bandwidth_down = ntohl(gateway->bandwidth_down); |
347 | gw_node->bandwidth_up = ntohl(gateway->bandwidth_up); | |
c6c8fea2 | 348 | |
807736f6 | 349 | spin_lock_bh(&bat_priv->gw.list_lock); |
f665fa7e | 350 | kref_get(&gw_node->refcount); |
70ea5cee | 351 | hlist_add_head_rcu(&gw_node->list, &bat_priv->gw.gateway_list); |
807736f6 | 352 | spin_unlock_bh(&bat_priv->gw.list_lock); |
c6c8fea2 | 353 | |
39c75a51 | 354 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
414254e3 ML |
355 | "Found new gateway %pM -> gw bandwidth: %u.%u/%u.%u MBit\n", |
356 | orig_node->orig, | |
357 | ntohl(gateway->bandwidth_down) / 10, | |
358 | ntohl(gateway->bandwidth_down) % 10, | |
359 | ntohl(gateway->bandwidth_up) / 10, | |
360 | ntohl(gateway->bandwidth_up) % 10); | |
f665fa7e SE |
361 | |
362 | /* don't return reference to new gw_node */ | |
363 | batadv_gw_node_put(gw_node); | |
c6c8fea2 SE |
364 | } |
365 | ||
414254e3 ML |
366 | /** |
367 | * batadv_gw_node_get - retrieve gateway node from list of available gateways | |
368 | * @bat_priv: the bat priv with all the soft interface information | |
369 | * @orig_node: originator announcing gateway capabilities | |
370 | * | |
62fe710f | 371 | * Return: gateway node if found or NULL otherwise. |
414254e3 | 372 | */ |
50164d8f AQ |
373 | struct batadv_gw_node *batadv_gw_node_get(struct batadv_priv *bat_priv, |
374 | struct batadv_orig_node *orig_node) | |
c6c8fea2 | 375 | { |
414254e3 | 376 | struct batadv_gw_node *gw_node_tmp, *gw_node = NULL; |
c6c8fea2 SE |
377 | |
378 | rcu_read_lock(); | |
70ea5cee SE |
379 | hlist_for_each_entry_rcu(gw_node_tmp, &bat_priv->gw.gateway_list, |
380 | list) { | |
414254e3 | 381 | if (gw_node_tmp->orig_node != orig_node) |
c6c8fea2 SE |
382 | continue; |
383 | ||
e7aed321 | 384 | if (!kref_get_unless_zero(&gw_node_tmp->refcount)) |
414254e3 | 385 | continue; |
c6c8fea2 | 386 | |
414254e3 ML |
387 | gw_node = gw_node_tmp; |
388 | break; | |
389 | } | |
390 | rcu_read_unlock(); | |
c6c8fea2 | 391 | |
414254e3 ML |
392 | return gw_node; |
393 | } | |
c6c8fea2 | 394 | |
414254e3 ML |
395 | /** |
396 | * batadv_gw_node_update - update list of available gateways with changed | |
397 | * bandwidth information | |
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 | */ | |
402 | void batadv_gw_node_update(struct batadv_priv *bat_priv, | |
403 | struct batadv_orig_node *orig_node, | |
404 | struct batadv_tvlv_gateway_data *gateway) | |
405 | { | |
406 | struct batadv_gw_node *gw_node, *curr_gw = NULL; | |
407 | ||
408 | gw_node = batadv_gw_node_get(bat_priv, orig_node); | |
409 | if (!gw_node) { | |
410 | batadv_gw_node_add(bat_priv, orig_node, gateway); | |
411 | goto out; | |
c6c8fea2 | 412 | } |
c6c8fea2 | 413 | |
414254e3 ML |
414 | if ((gw_node->bandwidth_down == ntohl(gateway->bandwidth_down)) && |
415 | (gw_node->bandwidth_up == ntohl(gateway->bandwidth_up))) | |
416 | goto out; | |
c6c8fea2 | 417 | |
414254e3 ML |
418 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
419 | "Gateway bandwidth of originator %pM changed from %u.%u/%u.%u MBit to %u.%u/%u.%u MBit\n", | |
420 | orig_node->orig, | |
421 | gw_node->bandwidth_down / 10, | |
422 | gw_node->bandwidth_down % 10, | |
423 | gw_node->bandwidth_up / 10, | |
424 | gw_node->bandwidth_up % 10, | |
425 | ntohl(gateway->bandwidth_down) / 10, | |
426 | ntohl(gateway->bandwidth_down) % 10, | |
427 | ntohl(gateway->bandwidth_up) / 10, | |
428 | ntohl(gateway->bandwidth_up) % 10); | |
429 | ||
430 | gw_node->bandwidth_down = ntohl(gateway->bandwidth_down); | |
431 | gw_node->bandwidth_up = ntohl(gateway->bandwidth_up); | |
432 | ||
414254e3 | 433 | if (ntohl(gateway->bandwidth_down) == 0) { |
414254e3 ML |
434 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
435 | "Gateway %pM removed from gateway list\n", | |
436 | orig_node->orig); | |
c4aac1ab | 437 | |
414254e3 ML |
438 | /* Note: We don't need a NULL check here, since curr_gw never |
439 | * gets dereferenced. | |
440 | */ | |
bd3524c1 | 441 | spin_lock_bh(&bat_priv->gw.list_lock); |
c18bdd01 SE |
442 | if (!hlist_unhashed(&gw_node->list)) { |
443 | hlist_del_init_rcu(&gw_node->list); | |
3a01743d | 444 | batadv_gw_node_put(gw_node); |
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 SW |
451 | |
452 | if (curr_gw) | |
3a01743d | 453 | batadv_gw_node_put(curr_gw); |
414254e3 | 454 | } |
71e4aa9c | 455 | |
414254e3 | 456 | out: |
414254e3 | 457 | if (gw_node) |
3a01743d | 458 | batadv_gw_node_put(gw_node); |
c6c8fea2 SE |
459 | } |
460 | ||
56303d34 SE |
461 | void batadv_gw_node_delete(struct batadv_priv *bat_priv, |
462 | struct batadv_orig_node *orig_node) | |
c6c8fea2 | 463 | { |
414254e3 ML |
464 | struct batadv_tvlv_gateway_data gateway; |
465 | ||
466 | gateway.bandwidth_down = 0; | |
467 | gateway.bandwidth_up = 0; | |
468 | ||
469 | batadv_gw_node_update(bat_priv, orig_node, &gateway); | |
c6c8fea2 SE |
470 | } |
471 | ||
bd3524c1 | 472 | void batadv_gw_node_free(struct batadv_priv *bat_priv) |
c6c8fea2 | 473 | { |
bd3524c1 | 474 | struct batadv_gw_node *gw_node; |
b67bfe0d | 475 | struct hlist_node *node_tmp; |
c6c8fea2 | 476 | |
807736f6 | 477 | spin_lock_bh(&bat_priv->gw.list_lock); |
b67bfe0d | 478 | hlist_for_each_entry_safe(gw_node, node_tmp, |
70ea5cee | 479 | &bat_priv->gw.gateway_list, list) { |
bd3524c1 | 480 | hlist_del_init_rcu(&gw_node->list); |
3a01743d | 481 | batadv_gw_node_put(gw_node); |
c6c8fea2 | 482 | } |
807736f6 | 483 | spin_unlock_bh(&bat_priv->gw.list_lock); |
c6c8fea2 SE |
484 | } |
485 | ||
dc1cbd14 | 486 | #ifdef CONFIG_BATMAN_ADV_DEBUGFS |
7cf06bc6 | 487 | int batadv_gw_client_seq_print_text(struct seq_file *seq, void *offset) |
c6c8fea2 SE |
488 | { |
489 | struct net_device *net_dev = (struct net_device *)seq->private; | |
56303d34 SE |
490 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
491 | struct batadv_hard_iface *primary_if; | |
c6c8fea2 | 492 | |
30da63a6 ML |
493 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
494 | if (!primary_if) | |
34d99cfe | 495 | return 0; |
c6c8fea2 | 496 | |
34d99cfe | 497 | seq_printf(seq, "[B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s %s)]\n", |
42d0b044 | 498 | BATADV_SOURCE_VERSION, primary_if->net_dev->name, |
34d99cfe AQ |
499 | primary_if->net_dev->dev_addr, net_dev->name, |
500 | bat_priv->algo_ops->name); | |
c6c8fea2 | 501 | |
34d99cfe | 502 | batadv_hardif_put(primary_if); |
c6c8fea2 | 503 | |
34d99cfe AQ |
504 | if (!bat_priv->algo_ops->gw.print) { |
505 | seq_puts(seq, | |
506 | "No printing function for this routing protocol\n"); | |
507 | return 0; | |
c6c8fea2 | 508 | } |
c6c8fea2 | 509 | |
34d99cfe | 510 | bat_priv->algo_ops->gw.print(bat_priv, seq); |
c6c8fea2 | 511 | |
30da63a6 | 512 | return 0; |
c6c8fea2 | 513 | } |
dc1cbd14 | 514 | #endif |
c6c8fea2 | 515 | |
d7129daf SE |
516 | /** |
517 | * batadv_gw_dump - Dump gateways into a message | |
518 | * @msg: Netlink message to dump into | |
519 | * @cb: Control block containing additional options | |
520 | * | |
521 | * Return: Error code, or length of message | |
522 | */ | |
523 | int batadv_gw_dump(struct sk_buff *msg, struct netlink_callback *cb) | |
524 | { | |
525 | struct batadv_hard_iface *primary_if = NULL; | |
526 | struct net *net = sock_net(cb->skb->sk); | |
527 | struct net_device *soft_iface; | |
528 | struct batadv_priv *bat_priv; | |
529 | int ifindex; | |
530 | int ret; | |
531 | ||
532 | ifindex = batadv_netlink_get_ifindex(cb->nlh, | |
533 | BATADV_ATTR_MESH_IFINDEX); | |
534 | if (!ifindex) | |
535 | return -EINVAL; | |
536 | ||
537 | soft_iface = dev_get_by_index(net, ifindex); | |
538 | if (!soft_iface || !batadv_softif_is_valid(soft_iface)) { | |
539 | ret = -ENODEV; | |
540 | goto out; | |
541 | } | |
542 | ||
543 | bat_priv = netdev_priv(soft_iface); | |
544 | ||
545 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
546 | if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) { | |
547 | ret = -ENOENT; | |
548 | goto out; | |
549 | } | |
550 | ||
551 | if (!bat_priv->algo_ops->gw.dump) { | |
552 | ret = -EOPNOTSUPP; | |
553 | goto out; | |
554 | } | |
555 | ||
556 | bat_priv->algo_ops->gw.dump(msg, cb, bat_priv); | |
557 | ||
558 | ret = msg->len; | |
559 | ||
560 | out: | |
561 | if (primary_if) | |
562 | batadv_hardif_put(primary_if); | |
563 | if (soft_iface) | |
564 | dev_put(soft_iface); | |
565 | ||
566 | return ret; | |
567 | } | |
568 | ||
6c413b1c AQ |
569 | /** |
570 | * batadv_gw_dhcp_recipient_get - check if a packet is a DHCP message | |
571 | * @skb: the packet to check | |
572 | * @header_len: a pointer to the batman-adv header size | |
573 | * @chaddr: buffer where the client address will be stored. Valid | |
574 | * only if the function returns BATADV_DHCP_TO_CLIENT | |
575 | * | |
62fe710f SE |
576 | * This function may re-allocate the data buffer of the skb passed as argument. |
577 | * | |
578 | * Return: | |
6c413b1c AQ |
579 | * - BATADV_DHCP_NO if the packet is not a dhcp message or if there was an error |
580 | * while parsing it | |
581 | * - BATADV_DHCP_TO_SERVER if this is a message going to the DHCP server | |
582 | * - BATADV_DHCP_TO_CLIENT if this is a message going to a DHCP client | |
6c413b1c AQ |
583 | */ |
584 | enum batadv_dhcp_recipient | |
585 | batadv_gw_dhcp_recipient_get(struct sk_buff *skb, unsigned int *header_len, | |
6b5e971a | 586 | u8 *chaddr) |
c6c8fea2 | 587 | { |
6c413b1c | 588 | enum batadv_dhcp_recipient ret = BATADV_DHCP_NO; |
c6c8fea2 SE |
589 | struct ethhdr *ethhdr; |
590 | struct iphdr *iphdr; | |
591 | struct ipv6hdr *ipv6hdr; | |
592 | struct udphdr *udphdr; | |
f7f8ed56 | 593 | struct vlan_ethhdr *vhdr; |
6c413b1c | 594 | int chaddr_offset; |
f7f8ed56 | 595 | __be16 proto; |
6b5e971a | 596 | u8 *p; |
c6c8fea2 SE |
597 | |
598 | /* check for ethernet header */ | |
be7af5cf | 599 | if (!pskb_may_pull(skb, *header_len + ETH_HLEN)) |
6c413b1c AQ |
600 | return BATADV_DHCP_NO; |
601 | ||
927c2ed7 | 602 | ethhdr = eth_hdr(skb); |
f7f8ed56 | 603 | proto = ethhdr->h_proto; |
be7af5cf | 604 | *header_len += ETH_HLEN; |
c6c8fea2 SE |
605 | |
606 | /* check for initial vlan header */ | |
f7f8ed56 | 607 | if (proto == htons(ETH_P_8021Q)) { |
be7af5cf | 608 | if (!pskb_may_pull(skb, *header_len + VLAN_HLEN)) |
6c413b1c | 609 | return BATADV_DHCP_NO; |
f7f8ed56 | 610 | |
927c2ed7 | 611 | vhdr = vlan_eth_hdr(skb); |
f7f8ed56 | 612 | proto = vhdr->h_vlan_encapsulated_proto; |
be7af5cf | 613 | *header_len += VLAN_HLEN; |
c6c8fea2 SE |
614 | } |
615 | ||
616 | /* check for ip header */ | |
f7f8ed56 AQ |
617 | switch (proto) { |
618 | case htons(ETH_P_IP): | |
be7af5cf | 619 | if (!pskb_may_pull(skb, *header_len + sizeof(*iphdr))) |
6c413b1c AQ |
620 | return BATADV_DHCP_NO; |
621 | ||
be7af5cf ML |
622 | iphdr = (struct iphdr *)(skb->data + *header_len); |
623 | *header_len += iphdr->ihl * 4; | |
c6c8fea2 SE |
624 | |
625 | /* check for udp header */ | |
626 | if (iphdr->protocol != IPPROTO_UDP) | |
6c413b1c | 627 | return BATADV_DHCP_NO; |
c6c8fea2 SE |
628 | |
629 | break; | |
f7f8ed56 | 630 | case htons(ETH_P_IPV6): |
be7af5cf | 631 | if (!pskb_may_pull(skb, *header_len + sizeof(*ipv6hdr))) |
6c413b1c AQ |
632 | return BATADV_DHCP_NO; |
633 | ||
be7af5cf ML |
634 | ipv6hdr = (struct ipv6hdr *)(skb->data + *header_len); |
635 | *header_len += sizeof(*ipv6hdr); | |
c6c8fea2 SE |
636 | |
637 | /* check for udp header */ | |
638 | if (ipv6hdr->nexthdr != IPPROTO_UDP) | |
6c413b1c | 639 | return BATADV_DHCP_NO; |
c6c8fea2 SE |
640 | |
641 | break; | |
642 | default: | |
6c413b1c | 643 | return BATADV_DHCP_NO; |
c6c8fea2 SE |
644 | } |
645 | ||
be7af5cf | 646 | if (!pskb_may_pull(skb, *header_len + sizeof(*udphdr))) |
6c413b1c | 647 | return BATADV_DHCP_NO; |
9d2c9488 | 648 | |
be7af5cf ML |
649 | udphdr = (struct udphdr *)(skb->data + *header_len); |
650 | *header_len += sizeof(*udphdr); | |
c6c8fea2 SE |
651 | |
652 | /* check for bootp port */ | |
6c413b1c AQ |
653 | switch (proto) { |
654 | case htons(ETH_P_IP): | |
655 | if (udphdr->dest == htons(67)) | |
656 | ret = BATADV_DHCP_TO_SERVER; | |
657 | else if (udphdr->source == htons(67)) | |
658 | ret = BATADV_DHCP_TO_CLIENT; | |
659 | break; | |
660 | case htons(ETH_P_IPV6): | |
661 | if (udphdr->dest == htons(547)) | |
662 | ret = BATADV_DHCP_TO_SERVER; | |
663 | else if (udphdr->source == htons(547)) | |
664 | ret = BATADV_DHCP_TO_CLIENT; | |
665 | break; | |
666 | } | |
c6c8fea2 | 667 | |
6c413b1c AQ |
668 | chaddr_offset = *header_len + BATADV_DHCP_CHADDR_OFFSET; |
669 | /* store the client address if the message is going to a client */ | |
670 | if (ret == BATADV_DHCP_TO_CLIENT && | |
671 | pskb_may_pull(skb, chaddr_offset + ETH_ALEN)) { | |
672 | /* check if the DHCP packet carries an Ethernet DHCP */ | |
673 | p = skb->data + *header_len + BATADV_DHCP_HTYPE_OFFSET; | |
674 | if (*p != BATADV_DHCP_HTYPE_ETHERNET) | |
675 | return BATADV_DHCP_NO; | |
676 | ||
677 | /* check if the DHCP packet carries a valid Ethernet address */ | |
678 | p = skb->data + *header_len + BATADV_DHCP_HLEN_OFFSET; | |
679 | if (*p != ETH_ALEN) | |
680 | return BATADV_DHCP_NO; | |
681 | ||
8fdd0153 | 682 | ether_addr_copy(chaddr, skb->data + chaddr_offset); |
6c413b1c | 683 | } |
c6c8fea2 | 684 | |
6c413b1c | 685 | return ret; |
be7af5cf | 686 | } |
aa143d28 | 687 | |
bbb877ed AQ |
688 | /** |
689 | * batadv_gw_out_of_range - check if the dhcp request destination is the best gw | |
690 | * @bat_priv: the bat priv with all the soft interface information | |
691 | * @skb: the outgoing packet | |
692 | * | |
693 | * Check if the skb is a DHCP request and if it is sent to the current best GW | |
694 | * server. Due to topology changes it may be the case that the GW server | |
695 | * previously selected is not the best one anymore. | |
696 | * | |
bbb877ed | 697 | * This call might reallocate skb data. |
6c413b1c | 698 | * Must be invoked only when the DHCP packet is going TO a DHCP SERVER. |
62fe710f SE |
699 | * |
700 | * Return: true if the packet destination is unicast and it is not the best gw, | |
701 | * false otherwise. | |
bbb877ed | 702 | */ |
56303d34 | 703 | bool batadv_gw_out_of_range(struct batadv_priv *bat_priv, |
9d2c9488 | 704 | struct sk_buff *skb) |
be7af5cf | 705 | { |
4f248cff SE |
706 | struct batadv_neigh_node *neigh_curr = NULL; |
707 | struct batadv_neigh_node *neigh_old = NULL; | |
422d2f77 | 708 | struct batadv_orig_node *orig_dst_node; |
4f248cff SE |
709 | struct batadv_gw_node *gw_node = NULL; |
710 | struct batadv_gw_node *curr_gw = NULL; | |
89652331 | 711 | struct batadv_neigh_ifinfo *curr_ifinfo, *old_ifinfo; |
6c413b1c AQ |
712 | struct ethhdr *ethhdr = (struct ethhdr *)skb->data; |
713 | bool out_of_range = false; | |
6b5e971a | 714 | u8 curr_tq_avg; |
bbb877ed AQ |
715 | unsigned short vid; |
716 | ||
717 | vid = batadv_get_vid(skb, 0); | |
be7af5cf | 718 | |
08c36d3e | 719 | orig_dst_node = batadv_transtable_search(bat_priv, ethhdr->h_source, |
bbb877ed | 720 | ethhdr->h_dest, vid); |
be7af5cf ML |
721 | if (!orig_dst_node) |
722 | goto out; | |
723 | ||
414254e3 | 724 | gw_node = batadv_gw_node_get(bat_priv, orig_dst_node); |
0d164491 | 725 | if (!gw_node) |
be7af5cf ML |
726 | goto out; |
727 | ||
3a24a63e | 728 | switch (atomic_read(&bat_priv->gw.mode)) { |
cd646ab1 | 729 | case BATADV_GW_MODE_SERVER: |
be7af5cf | 730 | /* If we are a GW then we are our best GW. We can artificially |
9cfc7bd6 SE |
731 | * set the tq towards ourself as the maximum value |
732 | */ | |
42d0b044 | 733 | curr_tq_avg = BATADV_TQ_MAX_VALUE; |
be7af5cf | 734 | break; |
cd646ab1 | 735 | case BATADV_GW_MODE_CLIENT: |
1409a834 | 736 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
be7af5cf ML |
737 | if (!curr_gw) |
738 | goto out; | |
739 | ||
740 | /* packet is going to our gateway */ | |
741 | if (curr_gw->orig_node == orig_dst_node) | |
742 | goto out; | |
743 | ||
744 | /* If the dhcp packet has been sent to a different gw, | |
745 | * we have to evaluate whether the old gw is still | |
9cfc7bd6 SE |
746 | * reliable enough |
747 | */ | |
30d3c511 SE |
748 | neigh_curr = batadv_find_router(bat_priv, curr_gw->orig_node, |
749 | NULL); | |
be7af5cf ML |
750 | if (!neigh_curr) |
751 | goto out; | |
752 | ||
89652331 SW |
753 | curr_ifinfo = batadv_neigh_ifinfo_get(neigh_curr, |
754 | BATADV_IF_DEFAULT); | |
755 | if (!curr_ifinfo) | |
756 | goto out; | |
757 | ||
758 | curr_tq_avg = curr_ifinfo->bat_iv.tq_avg; | |
044fa3ae | 759 | batadv_neigh_ifinfo_put(curr_ifinfo); |
89652331 | 760 | |
be7af5cf | 761 | break; |
cd646ab1 | 762 | case BATADV_GW_MODE_OFF: |
be7af5cf ML |
763 | default: |
764 | goto out; | |
43676ab5 | 765 | } |
be7af5cf | 766 | |
30d3c511 | 767 | neigh_old = batadv_find_router(bat_priv, orig_dst_node, NULL); |
2ef04f47 | 768 | if (!neigh_old) |
be7af5cf ML |
769 | goto out; |
770 | ||
89652331 SW |
771 | old_ifinfo = batadv_neigh_ifinfo_get(neigh_old, BATADV_IF_DEFAULT); |
772 | if (!old_ifinfo) | |
773 | goto out; | |
774 | ||
775 | if ((curr_tq_avg - old_ifinfo->bat_iv.tq_avg) > BATADV_GW_THRESHOLD) | |
be7af5cf | 776 | out_of_range = true; |
044fa3ae | 777 | batadv_neigh_ifinfo_put(old_ifinfo); |
be7af5cf ML |
778 | |
779 | out: | |
780 | if (orig_dst_node) | |
5d967310 | 781 | batadv_orig_node_put(orig_dst_node); |
be7af5cf | 782 | if (curr_gw) |
3a01743d | 783 | batadv_gw_node_put(curr_gw); |
414254e3 | 784 | if (gw_node) |
3a01743d | 785 | batadv_gw_node_put(gw_node); |
43676ab5 | 786 | if (neigh_old) |
25bb2509 | 787 | batadv_neigh_node_put(neigh_old); |
43676ab5 | 788 | if (neigh_curr) |
25bb2509 | 789 | batadv_neigh_node_put(neigh_curr); |
be7af5cf | 790 | return out_of_range; |
c6c8fea2 | 791 | } |