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1 | /* Copyright (C) 2009-2014 B.A.T.M.A.N. contributors: |
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 |
15 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
16 | */ |
17 | |
18 | #include "main.h" |
19 | #include "sysfs.h" |
20 | #include "gateway_client.h" |
21 | #include "gateway_common.h" |
22 | #include "hard-interface.h" |
23 | #include "originator.h" |
24 | #include "translation-table.h" |
25 | #include "routing.h" |
26 | #include <linux/ip.h> |
27 | #include <linux/ipv6.h> |
28 | #include <linux/udp.h> |
29 | #include <linux/if_vlan.h> |
30 | |
31 | /* These are the offsets of the "hw type" and "hw address length" in the dhcp |
32 | * packet starting at the beginning of the dhcp header |
33 | */ |
34 | #define BATADV_DHCP_HTYPE_OFFSET 1 |
35 | #define BATADV_DHCP_HLEN_OFFSET 2 |
36 | /* Value of htype representing Ethernet */ |
37 | #define BATADV_DHCP_HTYPE_ETHERNET 0x01 |
38 | /* This is the offset of the "chaddr" field in the dhcp packet starting at the |
39 | * beginning of the dhcp header |
40 | */ |
41 | #define BATADV_DHCP_CHADDR_OFFSET 28 |
42 | |
43 | static void batadv_gw_node_free_ref(struct batadv_gw_node *gw_node) |
44 | { |
45 | if (atomic_dec_and_test(&gw_node->refcount)) { |
46 | batadv_orig_node_free_ref(gw_node->orig_node); |
47 | kfree_rcu(gw_node, rcu); |
48 | } |
49 | } |
50 | |
51 | static struct batadv_gw_node * |
52 | batadv_gw_get_selected_gw_node(struct batadv_priv *bat_priv) |
53 | { |
54 | struct batadv_gw_node *gw_node; |
55 | |
56 | rcu_read_lock(); |
57 | gw_node = rcu_dereference(bat_priv->gw.curr_gw); |
58 | if (!gw_node) |
59 | goto out; |
60 | |
61 | if (!atomic_inc_not_zero(&gw_node->refcount)) |
62 | gw_node = NULL; |
63 | |
64 | out: |
65 | rcu_read_unlock(); |
66 | return gw_node; |
67 | } |
68 | |
69 | struct batadv_orig_node * |
70 | batadv_gw_get_selected_orig(struct batadv_priv *bat_priv) |
71 | { |
72 | struct batadv_gw_node *gw_node; |
73 | struct batadv_orig_node *orig_node = NULL; |
74 | |
75 | gw_node = batadv_gw_get_selected_gw_node(bat_priv); |
76 | if (!gw_node) |
77 | goto out; |
78 | |
79 | rcu_read_lock(); |
80 | orig_node = gw_node->orig_node; |
81 | if (!orig_node) |
82 | goto unlock; |
83 | |
84 | if (!atomic_inc_not_zero(&orig_node->refcount)) |
85 | orig_node = NULL; |
86 | |
87 | unlock: |
88 | rcu_read_unlock(); |
89 | out: |
90 | if (gw_node) |
91 | batadv_gw_node_free_ref(gw_node); |
92 | return orig_node; |
93 | } |
94 | |
95 | static void batadv_gw_select(struct batadv_priv *bat_priv, |
96 | struct batadv_gw_node *new_gw_node) |
97 | { |
98 | struct batadv_gw_node *curr_gw_node; |
99 | |
100 | spin_lock_bh(&bat_priv->gw.list_lock); |
101 | |
102 | if (new_gw_node && !atomic_inc_not_zero(&new_gw_node->refcount)) |
103 | new_gw_node = NULL; |
104 | |
105 | curr_gw_node = rcu_dereference_protected(bat_priv->gw.curr_gw, 1); |
106 | rcu_assign_pointer(bat_priv->gw.curr_gw, new_gw_node); |
107 | |
108 | if (curr_gw_node) |
109 | batadv_gw_node_free_ref(curr_gw_node); |
110 | |
111 | spin_unlock_bh(&bat_priv->gw.list_lock); |
112 | } |
113 | |
114 | /** |
115 | * batadv_gw_reselect - force a gateway reselection |
116 | * @bat_priv: the bat priv with all the soft interface information |
117 | * |
118 | * Set a flag to remind the GW component to perform a new gateway reselection. |
119 | * However this function does not ensure that the current gateway is going to be |
120 | * deselected. The reselection mechanism may elect the same gateway once again. |
121 | * |
122 | * This means that invoking batadv_gw_reselect() does not guarantee a gateway |
123 | * change and therefore a uevent is not necessarily expected. |
124 | */ |
125 | void batadv_gw_reselect(struct batadv_priv *bat_priv) |
126 | { |
127 | atomic_set(&bat_priv->gw.reselect, 1); |
128 | } |
129 | |
130 | static struct batadv_gw_node * |
131 | batadv_gw_get_best_gw_node(struct batadv_priv *bat_priv) |
132 | { |
133 | struct batadv_neigh_node *router; |
134 | struct batadv_neigh_ifinfo *router_ifinfo; |
135 | struct batadv_gw_node *gw_node, *curr_gw = NULL; |
136 | uint32_t max_gw_factor = 0, tmp_gw_factor = 0; |
137 | uint32_t gw_divisor; |
138 | uint8_t max_tq = 0; |
139 | uint8_t tq_avg; |
140 | struct batadv_orig_node *orig_node; |
141 | |
142 | gw_divisor = BATADV_TQ_LOCAL_WINDOW_SIZE * BATADV_TQ_LOCAL_WINDOW_SIZE; |
143 | gw_divisor *= 64; |
144 | |
145 | rcu_read_lock(); |
146 | hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.list, list) { |
147 | if (gw_node->deleted) |
148 | continue; |
149 | |
150 | orig_node = gw_node->orig_node; |
151 | router = batadv_orig_router_get(orig_node, BATADV_IF_DEFAULT); |
152 | if (!router) |
153 | continue; |
154 | |
155 | router_ifinfo = batadv_neigh_ifinfo_get(router, |
156 | BATADV_IF_DEFAULT); |
157 | if (!router_ifinfo) |
158 | goto next; |
159 | |
160 | if (!atomic_inc_not_zero(&gw_node->refcount)) |
161 | goto next; |
162 | |
163 | tq_avg = router_ifinfo->bat_iv.tq_avg; |
164 | |
165 | switch (atomic_read(&bat_priv->gw_sel_class)) { |
166 | case 1: /* fast connection */ |
167 | tmp_gw_factor = tq_avg * tq_avg; |
168 | tmp_gw_factor *= gw_node->bandwidth_down; |
169 | tmp_gw_factor *= 100 * 100; |
170 | tmp_gw_factor /= gw_divisor; |
171 | |
172 | if ((tmp_gw_factor > max_gw_factor) || |
173 | ((tmp_gw_factor == max_gw_factor) && |
174 | (tq_avg > max_tq))) { |
175 | if (curr_gw) |
176 | batadv_gw_node_free_ref(curr_gw); |
177 | curr_gw = gw_node; |
178 | atomic_inc(&curr_gw->refcount); |
179 | } |
180 | break; |
181 | |
182 | default: /* 2: stable connection (use best statistic) |
183 | * 3: fast-switch (use best statistic but change as |
184 | * soon as a better gateway appears) |
185 | * XX: late-switch (use best statistic but change as |
186 | * soon as a better gateway appears which has |
187 | * $routing_class more tq points) |
188 | */ |
189 | if (tq_avg > max_tq) { |
190 | if (curr_gw) |
191 | batadv_gw_node_free_ref(curr_gw); |
192 | curr_gw = gw_node; |
193 | atomic_inc(&curr_gw->refcount); |
194 | } |
195 | break; |
196 | } |
197 | |
198 | if (tq_avg > max_tq) |
199 | max_tq = tq_avg; |
200 | |
201 | if (tmp_gw_factor > max_gw_factor) |
202 | max_gw_factor = tmp_gw_factor; |
203 | |
204 | batadv_gw_node_free_ref(gw_node); |
205 | |
206 | next: |
207 | batadv_neigh_node_free_ref(router); |
208 | if (router_ifinfo) |
209 | batadv_neigh_ifinfo_free_ref(router_ifinfo); |
210 | } |
211 | rcu_read_unlock(); |
212 | |
213 | return curr_gw; |
214 | } |
215 | |
216 | /** |
217 | * batadv_gw_check_client_stop - check if client mode has been switched off |
218 | * @bat_priv: the bat priv with all the soft interface information |
219 | * |
220 | * This function assumes the caller has checked that the gw state *is actually |
221 | * changing*. This function is not supposed to be called when there is no state |
222 | * change. |
223 | */ |
224 | void batadv_gw_check_client_stop(struct batadv_priv *bat_priv) |
225 | { |
226 | struct batadv_gw_node *curr_gw; |
227 | |
228 | if (atomic_read(&bat_priv->gw_mode) != BATADV_GW_MODE_CLIENT) |
229 | return; |
230 | |
231 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
232 | if (!curr_gw) |
233 | return; |
234 | |
235 | /* deselect the current gateway so that next time that client mode is |
236 | * enabled a proper GW_ADD event can be sent |
237 | */ |
238 | batadv_gw_select(bat_priv, NULL); |
239 | |
240 | /* if batman-adv is switching the gw client mode off and a gateway was |
241 | * already selected, send a DEL uevent |
242 | */ |
243 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL, NULL); |
244 | |
245 | batadv_gw_node_free_ref(curr_gw); |
246 | } |
247 | |
248 | void batadv_gw_election(struct batadv_priv *bat_priv) |
249 | { |
250 | struct batadv_gw_node *curr_gw = NULL, *next_gw = NULL; |
251 | struct batadv_neigh_node *router = NULL; |
252 | struct batadv_neigh_ifinfo *router_ifinfo = NULL; |
253 | char gw_addr[18] = { '\0' }; |
254 | |
255 | if (atomic_read(&bat_priv->gw_mode) != BATADV_GW_MODE_CLIENT) |
256 | goto out; |
257 | |
258 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
259 | |
260 | if (!batadv_atomic_dec_not_zero(&bat_priv->gw.reselect) && curr_gw) |
261 | goto out; |
262 | |
263 | next_gw = batadv_gw_get_best_gw_node(bat_priv); |
264 | |
265 | if (curr_gw == next_gw) |
266 | goto out; |
267 | |
268 | if (next_gw) { |
269 | sprintf(gw_addr, "%pM", next_gw->orig_node->orig); |
270 | |
271 | router = batadv_orig_router_get(next_gw->orig_node, |
272 | BATADV_IF_DEFAULT); |
273 | if (!router) { |
274 | batadv_gw_reselect(bat_priv); |
275 | goto out; |
276 | } |
277 | |
278 | router_ifinfo = batadv_neigh_ifinfo_get(router, |
279 | BATADV_IF_DEFAULT); |
280 | if (!router_ifinfo) { |
281 | batadv_gw_reselect(bat_priv); |
282 | goto out; |
283 | } |
284 | } |
285 | |
286 | if ((curr_gw) && (!next_gw)) { |
287 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
288 | "Removing selected gateway - no gateway in range\n"); |
289 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL, |
290 | NULL); |
291 | } else if ((!curr_gw) && (next_gw)) { |
292 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
293 | "Adding route to gateway %pM (bandwidth: %u.%u/%u.%u MBit, tq: %i)\n", |
294 | next_gw->orig_node->orig, |
295 | next_gw->bandwidth_down / 10, |
296 | next_gw->bandwidth_down % 10, |
297 | next_gw->bandwidth_up / 10, |
298 | next_gw->bandwidth_up % 10, |
299 | router_ifinfo->bat_iv.tq_avg); |
300 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_ADD, |
301 | gw_addr); |
302 | } else { |
303 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
304 | "Changing route to gateway %pM (bandwidth: %u.%u/%u.%u MBit, tq: %i)\n", |
305 | next_gw->orig_node->orig, |
306 | next_gw->bandwidth_down / 10, |
307 | next_gw->bandwidth_down % 10, |
308 | next_gw->bandwidth_up / 10, |
309 | next_gw->bandwidth_up % 10, |
310 | router_ifinfo->bat_iv.tq_avg); |
311 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_CHANGE, |
312 | gw_addr); |
313 | } |
314 | |
315 | batadv_gw_select(bat_priv, next_gw); |
316 | |
317 | out: |
318 | if (curr_gw) |
319 | batadv_gw_node_free_ref(curr_gw); |
320 | if (next_gw) |
321 | batadv_gw_node_free_ref(next_gw); |
322 | if (router) |
323 | batadv_neigh_node_free_ref(router); |
324 | if (router_ifinfo) |
325 | batadv_neigh_ifinfo_free_ref(router_ifinfo); |
326 | } |
327 | |
328 | void batadv_gw_check_election(struct batadv_priv *bat_priv, |
329 | struct batadv_orig_node *orig_node) |
330 | { |
331 | struct batadv_neigh_ifinfo *router_orig_tq = NULL; |
332 | struct batadv_neigh_ifinfo *router_gw_tq = NULL; |
333 | struct batadv_orig_node *curr_gw_orig; |
334 | struct batadv_neigh_node *router_gw = NULL, *router_orig = NULL; |
335 | uint8_t gw_tq_avg, orig_tq_avg; |
336 | |
337 | curr_gw_orig = batadv_gw_get_selected_orig(bat_priv); |
338 | if (!curr_gw_orig) |
339 | goto reselect; |
340 | |
341 | router_gw = batadv_orig_router_get(curr_gw_orig, BATADV_IF_DEFAULT); |
342 | if (!router_gw) |
343 | goto reselect; |
344 | |
345 | router_gw_tq = batadv_neigh_ifinfo_get(router_gw, |
346 | BATADV_IF_DEFAULT); |
347 | if (!router_gw_tq) |
348 | goto reselect; |
349 | |
350 | /* this node already is the gateway */ |
351 | if (curr_gw_orig == orig_node) |
352 | goto out; |
353 | |
354 | router_orig = batadv_orig_router_get(orig_node, BATADV_IF_DEFAULT); |
355 | if (!router_orig) |
356 | goto out; |
357 | |
358 | router_orig_tq = batadv_neigh_ifinfo_get(router_orig, |
359 | BATADV_IF_DEFAULT); |
360 | if (!router_orig_tq) |
361 | goto out; |
362 | |
363 | gw_tq_avg = router_gw_tq->bat_iv.tq_avg; |
364 | orig_tq_avg = router_orig_tq->bat_iv.tq_avg; |
365 | |
366 | /* the TQ value has to be better */ |
367 | if (orig_tq_avg < gw_tq_avg) |
368 | goto out; |
369 | |
370 | /* if the routing class is greater than 3 the value tells us how much |
371 | * greater the TQ value of the new gateway must be |
372 | */ |
373 | if ((atomic_read(&bat_priv->gw_sel_class) > 3) && |
374 | (orig_tq_avg - gw_tq_avg < atomic_read(&bat_priv->gw_sel_class))) |
375 | goto out; |
376 | |
377 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
378 | "Restarting gateway selection: better gateway found (tq curr: %i, tq new: %i)\n", |
379 | gw_tq_avg, orig_tq_avg); |
380 | |
381 | reselect: |
382 | batadv_gw_reselect(bat_priv); |
383 | out: |
384 | if (curr_gw_orig) |
385 | batadv_orig_node_free_ref(curr_gw_orig); |
386 | if (router_gw) |
387 | batadv_neigh_node_free_ref(router_gw); |
388 | if (router_orig) |
389 | batadv_neigh_node_free_ref(router_orig); |
390 | if (router_gw_tq) |
391 | batadv_neigh_ifinfo_free_ref(router_gw_tq); |
392 | if (router_orig_tq) |
393 | batadv_neigh_ifinfo_free_ref(router_orig_tq); |
394 | } |
395 | |
396 | /** |
397 | * batadv_gw_node_add - add gateway node to list of available gateways |
398 | * @bat_priv: the bat priv with all the soft interface information |
399 | * @orig_node: originator announcing gateway capabilities |
400 | * @gateway: announced bandwidth information |
401 | */ |
402 | static void batadv_gw_node_add(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; |
407 | |
408 | if (gateway->bandwidth_down == 0) |
409 | return; |
410 | |
411 | if (!atomic_inc_not_zero(&orig_node->refcount)) |
412 | return; |
413 | |
414 | gw_node = kzalloc(sizeof(*gw_node), GFP_ATOMIC); |
415 | if (!gw_node) { |
416 | batadv_orig_node_free_ref(orig_node); |
417 | return; |
418 | } |
419 | |
420 | INIT_HLIST_NODE(&gw_node->list); |
421 | gw_node->orig_node = orig_node; |
422 | atomic_set(&gw_node->refcount, 1); |
423 | |
424 | spin_lock_bh(&bat_priv->gw.list_lock); |
425 | hlist_add_head_rcu(&gw_node->list, &bat_priv->gw.list); |
426 | spin_unlock_bh(&bat_priv->gw.list_lock); |
427 | |
428 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
429 | "Found new gateway %pM -> gw bandwidth: %u.%u/%u.%u MBit\n", |
430 | orig_node->orig, |
431 | ntohl(gateway->bandwidth_down) / 10, |
432 | ntohl(gateway->bandwidth_down) % 10, |
433 | ntohl(gateway->bandwidth_up) / 10, |
434 | ntohl(gateway->bandwidth_up) % 10); |
435 | } |
436 | |
437 | /** |
438 | * batadv_gw_node_get - retrieve gateway node from list of available gateways |
439 | * @bat_priv: the bat priv with all the soft interface information |
440 | * @orig_node: originator announcing gateway capabilities |
441 | * |
442 | * Returns gateway node if found or NULL otherwise. |
443 | */ |
444 | static struct batadv_gw_node * |
445 | batadv_gw_node_get(struct batadv_priv *bat_priv, |
446 | struct batadv_orig_node *orig_node) |
447 | { |
448 | struct batadv_gw_node *gw_node_tmp, *gw_node = NULL; |
449 | |
450 | rcu_read_lock(); |
451 | hlist_for_each_entry_rcu(gw_node_tmp, &bat_priv->gw.list, list) { |
452 | if (gw_node_tmp->orig_node != orig_node) |
453 | continue; |
454 | |
455 | if (gw_node_tmp->deleted) |
456 | continue; |
457 | |
458 | if (!atomic_inc_not_zero(&gw_node_tmp->refcount)) |
459 | continue; |
460 | |
461 | gw_node = gw_node_tmp; |
462 | break; |
463 | } |
464 | rcu_read_unlock(); |
465 | |
466 | return gw_node; |
467 | } |
468 | |
469 | /** |
470 | * batadv_gw_node_update - update list of available gateways with changed |
471 | * bandwidth information |
472 | * @bat_priv: the bat priv with all the soft interface information |
473 | * @orig_node: originator announcing gateway capabilities |
474 | * @gateway: announced bandwidth information |
475 | */ |
476 | void batadv_gw_node_update(struct batadv_priv *bat_priv, |
477 | struct batadv_orig_node *orig_node, |
478 | struct batadv_tvlv_gateway_data *gateway) |
479 | { |
480 | struct batadv_gw_node *gw_node, *curr_gw = NULL; |
481 | |
482 | gw_node = batadv_gw_node_get(bat_priv, orig_node); |
483 | if (!gw_node) { |
484 | batadv_gw_node_add(bat_priv, orig_node, gateway); |
485 | goto out; |
486 | } |
487 | |
488 | if ((gw_node->bandwidth_down == ntohl(gateway->bandwidth_down)) && |
489 | (gw_node->bandwidth_up == ntohl(gateway->bandwidth_up))) |
490 | goto out; |
491 | |
492 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
493 | "Gateway bandwidth of originator %pM changed from %u.%u/%u.%u MBit to %u.%u/%u.%u MBit\n", |
494 | orig_node->orig, |
495 | gw_node->bandwidth_down / 10, |
496 | gw_node->bandwidth_down % 10, |
497 | gw_node->bandwidth_up / 10, |
498 | gw_node->bandwidth_up % 10, |
499 | ntohl(gateway->bandwidth_down) / 10, |
500 | ntohl(gateway->bandwidth_down) % 10, |
501 | ntohl(gateway->bandwidth_up) / 10, |
502 | ntohl(gateway->bandwidth_up) % 10); |
503 | |
504 | gw_node->bandwidth_down = ntohl(gateway->bandwidth_down); |
505 | gw_node->bandwidth_up = ntohl(gateway->bandwidth_up); |
506 | |
507 | gw_node->deleted = 0; |
508 | if (ntohl(gateway->bandwidth_down) == 0) { |
509 | gw_node->deleted = jiffies; |
510 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
511 | "Gateway %pM removed from gateway list\n", |
512 | orig_node->orig); |
513 | |
514 | /* Note: We don't need a NULL check here, since curr_gw never |
515 | * gets dereferenced. |
516 | */ |
517 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
518 | if (gw_node == curr_gw) |
519 | batadv_gw_reselect(bat_priv); |
520 | } |
521 | |
522 | out: |
523 | if (curr_gw) |
524 | batadv_gw_node_free_ref(curr_gw); |
525 | if (gw_node) |
526 | batadv_gw_node_free_ref(gw_node); |
527 | } |
528 | |
529 | void batadv_gw_node_delete(struct batadv_priv *bat_priv, |
530 | struct batadv_orig_node *orig_node) |
531 | { |
532 | struct batadv_tvlv_gateway_data gateway; |
533 | |
534 | gateway.bandwidth_down = 0; |
535 | gateway.bandwidth_up = 0; |
536 | |
537 | batadv_gw_node_update(bat_priv, orig_node, &gateway); |
538 | } |
539 | |
540 | void batadv_gw_node_purge(struct batadv_priv *bat_priv) |
541 | { |
542 | struct batadv_gw_node *gw_node, *curr_gw; |
543 | struct hlist_node *node_tmp; |
544 | unsigned long timeout = msecs_to_jiffies(2 * BATADV_PURGE_TIMEOUT); |
545 | int do_reselect = 0; |
546 | |
547 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
548 | |
549 | spin_lock_bh(&bat_priv->gw.list_lock); |
550 | |
551 | hlist_for_each_entry_safe(gw_node, node_tmp, |
552 | &bat_priv->gw.list, list) { |
553 | if (((!gw_node->deleted) || |
554 | (time_before(jiffies, gw_node->deleted + timeout))) && |
555 | atomic_read(&bat_priv->mesh_state) == BATADV_MESH_ACTIVE) |
556 | continue; |
557 | |
558 | if (curr_gw == gw_node) |
559 | do_reselect = 1; |
560 | |
561 | hlist_del_rcu(&gw_node->list); |
562 | batadv_gw_node_free_ref(gw_node); |
563 | } |
564 | |
565 | spin_unlock_bh(&bat_priv->gw.list_lock); |
566 | |
567 | /* gw_reselect() needs to acquire the gw_list_lock */ |
568 | if (do_reselect) |
569 | batadv_gw_reselect(bat_priv); |
570 | |
571 | if (curr_gw) |
572 | batadv_gw_node_free_ref(curr_gw); |
573 | } |
574 | |
575 | /* fails if orig_node has no router */ |
576 | static int batadv_write_buffer_text(struct batadv_priv *bat_priv, |
577 | struct seq_file *seq, |
578 | const struct batadv_gw_node *gw_node) |
579 | { |
580 | struct batadv_gw_node *curr_gw; |
581 | struct batadv_neigh_node *router; |
582 | struct batadv_neigh_ifinfo *router_ifinfo = NULL; |
583 | int ret = -1; |
584 | |
585 | router = batadv_orig_router_get(gw_node->orig_node, BATADV_IF_DEFAULT); |
586 | if (!router) |
587 | goto out; |
588 | |
589 | router_ifinfo = batadv_neigh_ifinfo_get(router, BATADV_IF_DEFAULT); |
590 | if (!router_ifinfo) |
591 | goto out; |
592 | |
593 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
594 | |
595 | ret = seq_printf(seq, "%s %pM (%3i) %pM [%10s]: %u.%u/%u.%u MBit\n", |
596 | (curr_gw == gw_node ? "=>" : " "), |
597 | gw_node->orig_node->orig, |
598 | router_ifinfo->bat_iv.tq_avg, router->addr, |
599 | router->if_incoming->net_dev->name, |
600 | gw_node->bandwidth_down / 10, |
601 | gw_node->bandwidth_down % 10, |
602 | gw_node->bandwidth_up / 10, |
603 | gw_node->bandwidth_up % 10); |
604 | |
605 | if (curr_gw) |
606 | batadv_gw_node_free_ref(curr_gw); |
607 | out: |
608 | if (router_ifinfo) |
609 | batadv_neigh_ifinfo_free_ref(router_ifinfo); |
610 | if (router) |
611 | batadv_neigh_node_free_ref(router); |
612 | return ret; |
613 | } |
614 | |
615 | int batadv_gw_client_seq_print_text(struct seq_file *seq, void *offset) |
616 | { |
617 | struct net_device *net_dev = (struct net_device *)seq->private; |
618 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
619 | struct batadv_hard_iface *primary_if; |
620 | struct batadv_gw_node *gw_node; |
621 | int gw_count = 0; |
622 | |
623 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
624 | if (!primary_if) |
625 | goto out; |
626 | |
627 | seq_printf(seq, |
628 | " %-12s (%s/%i) %17s [%10s]: advertised uplink bandwidth ... [B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s)]\n", |
629 | "Gateway", "#", BATADV_TQ_MAX_VALUE, "Nexthop", "outgoingIF", |
630 | BATADV_SOURCE_VERSION, primary_if->net_dev->name, |
631 | primary_if->net_dev->dev_addr, net_dev->name); |
632 | |
633 | rcu_read_lock(); |
634 | hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.list, list) { |
635 | if (gw_node->deleted) |
636 | continue; |
637 | |
638 | /* fails if orig_node has no router */ |
639 | if (batadv_write_buffer_text(bat_priv, seq, gw_node) < 0) |
640 | continue; |
641 | |
642 | gw_count++; |
643 | } |
644 | rcu_read_unlock(); |
645 | |
646 | if (gw_count == 0) |
647 | seq_puts(seq, "No gateways in range ...\n"); |
648 | |
649 | out: |
650 | if (primary_if) |
651 | batadv_hardif_free_ref(primary_if); |
652 | return 0; |
653 | } |
654 | |
655 | /** |
656 | * batadv_gw_dhcp_recipient_get - check if a packet is a DHCP message |
657 | * @skb: the packet to check |
658 | * @header_len: a pointer to the batman-adv header size |
659 | * @chaddr: buffer where the client address will be stored. Valid |
660 | * only if the function returns BATADV_DHCP_TO_CLIENT |
661 | * |
662 | * Returns: |
663 | * - BATADV_DHCP_NO if the packet is not a dhcp message or if there was an error |
664 | * while parsing it |
665 | * - BATADV_DHCP_TO_SERVER if this is a message going to the DHCP server |
666 | * - BATADV_DHCP_TO_CLIENT if this is a message going to a DHCP client |
667 | * |
668 | * This function may re-allocate the data buffer of the skb passed as argument. |
669 | */ |
670 | enum batadv_dhcp_recipient |
671 | batadv_gw_dhcp_recipient_get(struct sk_buff *skb, unsigned int *header_len, |
672 | uint8_t *chaddr) |
673 | { |
674 | enum batadv_dhcp_recipient ret = BATADV_DHCP_NO; |
675 | struct ethhdr *ethhdr; |
676 | struct iphdr *iphdr; |
677 | struct ipv6hdr *ipv6hdr; |
678 | struct udphdr *udphdr; |
679 | struct vlan_ethhdr *vhdr; |
680 | int chaddr_offset; |
681 | __be16 proto; |
682 | uint8_t *p; |
683 | |
684 | /* check for ethernet header */ |
685 | if (!pskb_may_pull(skb, *header_len + ETH_HLEN)) |
686 | return BATADV_DHCP_NO; |
687 | |
688 | ethhdr = eth_hdr(skb); |
689 | proto = ethhdr->h_proto; |
690 | *header_len += ETH_HLEN; |
691 | |
692 | /* check for initial vlan header */ |
693 | if (proto == htons(ETH_P_8021Q)) { |
694 | if (!pskb_may_pull(skb, *header_len + VLAN_HLEN)) |
695 | return BATADV_DHCP_NO; |
696 | |
697 | vhdr = vlan_eth_hdr(skb); |
698 | proto = vhdr->h_vlan_encapsulated_proto; |
699 | *header_len += VLAN_HLEN; |
700 | } |
701 | |
702 | /* check for ip header */ |
703 | switch (proto) { |
704 | case htons(ETH_P_IP): |
705 | if (!pskb_may_pull(skb, *header_len + sizeof(*iphdr))) |
706 | return BATADV_DHCP_NO; |
707 | |
708 | iphdr = (struct iphdr *)(skb->data + *header_len); |
709 | *header_len += iphdr->ihl * 4; |
710 | |
711 | /* check for udp header */ |
712 | if (iphdr->protocol != IPPROTO_UDP) |
713 | return BATADV_DHCP_NO; |
714 | |
715 | break; |
716 | case htons(ETH_P_IPV6): |
717 | if (!pskb_may_pull(skb, *header_len + sizeof(*ipv6hdr))) |
718 | return BATADV_DHCP_NO; |
719 | |
720 | ipv6hdr = (struct ipv6hdr *)(skb->data + *header_len); |
721 | *header_len += sizeof(*ipv6hdr); |
722 | |
723 | /* check for udp header */ |
724 | if (ipv6hdr->nexthdr != IPPROTO_UDP) |
725 | return BATADV_DHCP_NO; |
726 | |
727 | break; |
728 | default: |
729 | return BATADV_DHCP_NO; |
730 | } |
731 | |
732 | if (!pskb_may_pull(skb, *header_len + sizeof(*udphdr))) |
733 | return BATADV_DHCP_NO; |
734 | |
735 | /* skb->data might have been reallocated by pskb_may_pull() */ |
736 | ethhdr = eth_hdr(skb); |
737 | if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) |
738 | ethhdr = (struct ethhdr *)(skb->data + VLAN_HLEN); |
739 | |
740 | udphdr = (struct udphdr *)(skb->data + *header_len); |
741 | *header_len += sizeof(*udphdr); |
742 | |
743 | /* check for bootp port */ |
744 | switch (proto) { |
745 | case htons(ETH_P_IP): |
746 | if (udphdr->dest == htons(67)) |
747 | ret = BATADV_DHCP_TO_SERVER; |
748 | else if (udphdr->source == htons(67)) |
749 | ret = BATADV_DHCP_TO_CLIENT; |
750 | break; |
751 | case htons(ETH_P_IPV6): |
752 | if (udphdr->dest == htons(547)) |
753 | ret = BATADV_DHCP_TO_SERVER; |
754 | else if (udphdr->source == htons(547)) |
755 | ret = BATADV_DHCP_TO_CLIENT; |
756 | break; |
757 | } |
758 | |
759 | chaddr_offset = *header_len + BATADV_DHCP_CHADDR_OFFSET; |
760 | /* store the client address if the message is going to a client */ |
761 | if (ret == BATADV_DHCP_TO_CLIENT && |
762 | pskb_may_pull(skb, chaddr_offset + ETH_ALEN)) { |
763 | /* check if the DHCP packet carries an Ethernet DHCP */ |
764 | p = skb->data + *header_len + BATADV_DHCP_HTYPE_OFFSET; |
765 | if (*p != BATADV_DHCP_HTYPE_ETHERNET) |
766 | return BATADV_DHCP_NO; |
767 | |
768 | /* check if the DHCP packet carries a valid Ethernet address */ |
769 | p = skb->data + *header_len + BATADV_DHCP_HLEN_OFFSET; |
770 | if (*p != ETH_ALEN) |
771 | return BATADV_DHCP_NO; |
772 | |
773 | ether_addr_copy(chaddr, skb->data + chaddr_offset); |
774 | } |
775 | |
776 | return ret; |
777 | } |
778 | /** |
779 | * batadv_gw_out_of_range - check if the dhcp request destination is the best gw |
780 | * @bat_priv: the bat priv with all the soft interface information |
781 | * @skb: the outgoing packet |
782 | * |
783 | * Check if the skb is a DHCP request and if it is sent to the current best GW |
784 | * server. Due to topology changes it may be the case that the GW server |
785 | * previously selected is not the best one anymore. |
786 | * |
787 | * Returns true if the packet destination is unicast and it is not the best gw, |
788 | * false otherwise. |
789 | * |
790 | * This call might reallocate skb data. |
791 | * Must be invoked only when the DHCP packet is going TO a DHCP SERVER. |
792 | */ |
793 | bool batadv_gw_out_of_range(struct batadv_priv *bat_priv, |
794 | struct sk_buff *skb) |
795 | { |
796 | struct batadv_neigh_node *neigh_curr = NULL, *neigh_old = NULL; |
797 | struct batadv_orig_node *orig_dst_node = NULL; |
798 | struct batadv_gw_node *gw_node = NULL, *curr_gw = NULL; |
799 | struct batadv_neigh_ifinfo *curr_ifinfo, *old_ifinfo; |
800 | struct ethhdr *ethhdr = (struct ethhdr *)skb->data; |
801 | bool out_of_range = false; |
802 | uint8_t curr_tq_avg; |
803 | unsigned short vid; |
804 | |
805 | vid = batadv_get_vid(skb, 0); |
806 | |
807 | orig_dst_node = batadv_transtable_search(bat_priv, ethhdr->h_source, |
808 | ethhdr->h_dest, vid); |
809 | if (!orig_dst_node) |
810 | goto out; |
811 | |
812 | gw_node = batadv_gw_node_get(bat_priv, orig_dst_node); |
813 | if (!gw_node->bandwidth_down == 0) |
814 | goto out; |
815 | |
816 | switch (atomic_read(&bat_priv->gw_mode)) { |
817 | case BATADV_GW_MODE_SERVER: |
818 | /* If we are a GW then we are our best GW. We can artificially |
819 | * set the tq towards ourself as the maximum value |
820 | */ |
821 | curr_tq_avg = BATADV_TQ_MAX_VALUE; |
822 | break; |
823 | case BATADV_GW_MODE_CLIENT: |
824 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
825 | if (!curr_gw) |
826 | goto out; |
827 | |
828 | /* packet is going to our gateway */ |
829 | if (curr_gw->orig_node == orig_dst_node) |
830 | goto out; |
831 | |
832 | /* If the dhcp packet has been sent to a different gw, |
833 | * we have to evaluate whether the old gw is still |
834 | * reliable enough |
835 | */ |
836 | neigh_curr = batadv_find_router(bat_priv, curr_gw->orig_node, |
837 | NULL); |
838 | if (!neigh_curr) |
839 | goto out; |
840 | |
841 | curr_ifinfo = batadv_neigh_ifinfo_get(neigh_curr, |
842 | BATADV_IF_DEFAULT); |
843 | if (!curr_ifinfo) |
844 | goto out; |
845 | |
846 | curr_tq_avg = curr_ifinfo->bat_iv.tq_avg; |
847 | batadv_neigh_ifinfo_free_ref(curr_ifinfo); |
848 | |
849 | break; |
850 | case BATADV_GW_MODE_OFF: |
851 | default: |
852 | goto out; |
853 | } |
854 | |
855 | neigh_old = batadv_find_router(bat_priv, orig_dst_node, NULL); |
856 | if (!neigh_old) |
857 | goto out; |
858 | |
859 | old_ifinfo = batadv_neigh_ifinfo_get(neigh_old, BATADV_IF_DEFAULT); |
860 | if (!old_ifinfo) |
861 | goto out; |
862 | |
863 | if ((curr_tq_avg - old_ifinfo->bat_iv.tq_avg) > BATADV_GW_THRESHOLD) |
864 | out_of_range = true; |
865 | batadv_neigh_ifinfo_free_ref(old_ifinfo); |
866 | |
867 | out: |
868 | if (orig_dst_node) |
869 | batadv_orig_node_free_ref(orig_dst_node); |
870 | if (curr_gw) |
871 | batadv_gw_node_free_ref(curr_gw); |
872 | if (gw_node) |
873 | batadv_gw_node_free_ref(gw_node); |
874 | if (neigh_old) |
875 | batadv_neigh_node_free_ref(neigh_old); |
876 | if (neigh_curr) |
877 | batadv_neigh_node_free_ref(neigh_curr); |
878 | return out_of_range; |
879 | } |
880 |
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