Commit | Line | Data |
---|---|---|
c6c8fea2 | 1 | /* |
567db7b0 | 2 | * Copyright (C) 2009-2012 B.A.T.M.A.N. contributors: |
c6c8fea2 SE |
3 | * |
4 | * Marek Lindner | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of version 2 of the GNU General Public | |
8 | * License as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
18 | * 02110-1301, USA | |
19 | * | |
20 | */ | |
21 | ||
22 | #include "main.h" | |
2265c141 | 23 | #include "bat_sysfs.h" |
c6c8fea2 SE |
24 | #include "gateway_client.h" |
25 | #include "gateway_common.h" | |
26 | #include "hard-interface.h" | |
57f0c07c | 27 | #include "originator.h" |
be7af5cf | 28 | #include "translation-table.h" |
43676ab5 | 29 | #include "routing.h" |
c6c8fea2 SE |
30 | #include <linux/ip.h> |
31 | #include <linux/ipv6.h> | |
32 | #include <linux/udp.h> | |
33 | #include <linux/if_vlan.h> | |
34 | ||
43676ab5 AQ |
35 | /* This is the offset of the options field in a dhcp packet starting at |
36 | * the beginning of the dhcp header */ | |
37 | #define DHCP_OPTIONS_OFFSET 240 | |
38 | #define DHCP_REQUEST 3 | |
39 | ||
25b6d3c1 | 40 | static void gw_node_free_ref(struct gw_node *gw_node) |
c6c8fea2 | 41 | { |
25b6d3c1 | 42 | if (atomic_dec_and_test(&gw_node->refcount)) |
eb340b2f | 43 | kfree_rcu(gw_node, rcu); |
c6c8fea2 SE |
44 | } |
45 | ||
c4aac1ab | 46 | static struct gw_node *gw_get_selected_gw_node(struct bat_priv *bat_priv) |
c6c8fea2 | 47 | { |
c4aac1ab | 48 | struct gw_node *gw_node; |
c6c8fea2 | 49 | |
5d02b3cd | 50 | rcu_read_lock(); |
c4aac1ab ML |
51 | gw_node = rcu_dereference(bat_priv->curr_gw); |
52 | if (!gw_node) | |
7b36e8ee | 53 | goto out; |
c6c8fea2 | 54 | |
c4aac1ab ML |
55 | if (!atomic_inc_not_zero(&gw_node->refcount)) |
56 | gw_node = NULL; | |
43c70ad5 | 57 | |
5d02b3cd LL |
58 | out: |
59 | rcu_read_unlock(); | |
c4aac1ab | 60 | return gw_node; |
c6c8fea2 SE |
61 | } |
62 | ||
c4aac1ab | 63 | struct orig_node *gw_get_selected_orig(struct bat_priv *bat_priv) |
c6c8fea2 | 64 | { |
5d02b3cd | 65 | struct gw_node *gw_node; |
c4aac1ab | 66 | struct orig_node *orig_node = NULL; |
c6c8fea2 | 67 | |
c4aac1ab ML |
68 | gw_node = gw_get_selected_gw_node(bat_priv); |
69 | if (!gw_node) | |
70 | goto out; | |
71 | ||
72 | rcu_read_lock(); | |
73 | orig_node = gw_node->orig_node; | |
74 | if (!orig_node) | |
75 | goto unlock; | |
76 | ||
77 | if (!atomic_inc_not_zero(&orig_node->refcount)) | |
78 | orig_node = NULL; | |
c6c8fea2 | 79 | |
c4aac1ab ML |
80 | unlock: |
81 | rcu_read_unlock(); | |
82 | out: | |
c6c8fea2 | 83 | if (gw_node) |
25b6d3c1 | 84 | gw_node_free_ref(gw_node); |
c4aac1ab | 85 | return orig_node; |
c6c8fea2 SE |
86 | } |
87 | ||
25b6d3c1 | 88 | static void gw_select(struct bat_priv *bat_priv, struct gw_node *new_gw_node) |
c6c8fea2 | 89 | { |
5d02b3cd | 90 | struct gw_node *curr_gw_node; |
c6c8fea2 | 91 | |
c4aac1ab ML |
92 | spin_lock_bh(&bat_priv->gw_list_lock); |
93 | ||
25b6d3c1 ML |
94 | if (new_gw_node && !atomic_inc_not_zero(&new_gw_node->refcount)) |
95 | new_gw_node = NULL; | |
c6c8fea2 | 96 | |
728cbc6a | 97 | curr_gw_node = rcu_dereference_protected(bat_priv->curr_gw, 1); |
5d02b3cd | 98 | rcu_assign_pointer(bat_priv->curr_gw, new_gw_node); |
25b6d3c1 ML |
99 | |
100 | if (curr_gw_node) | |
101 | gw_node_free_ref(curr_gw_node); | |
c4aac1ab ML |
102 | |
103 | spin_unlock_bh(&bat_priv->gw_list_lock); | |
104 | } | |
105 | ||
106 | void gw_deselect(struct bat_priv *bat_priv) | |
107 | { | |
2265c141 | 108 | atomic_set(&bat_priv->gw_reselect, 1); |
c6c8fea2 SE |
109 | } |
110 | ||
2265c141 | 111 | static struct gw_node *gw_get_best_gw_node(struct bat_priv *bat_priv) |
c6c8fea2 | 112 | { |
e1a5382f | 113 | struct neigh_node *router; |
2265c141 AQ |
114 | struct hlist_node *node; |
115 | struct gw_node *gw_node, *curr_gw = NULL; | |
c6c8fea2 | 116 | uint32_t max_gw_factor = 0, tmp_gw_factor = 0; |
2265c141 | 117 | uint8_t max_tq = 0; |
c6c8fea2 SE |
118 | int down, up; |
119 | ||
c4aac1ab | 120 | rcu_read_lock(); |
c6c8fea2 | 121 | hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) { |
e1a5382f | 122 | if (gw_node->deleted) |
c6c8fea2 SE |
123 | continue; |
124 | ||
e1a5382f LL |
125 | router = orig_node_get_router(gw_node->orig_node); |
126 | if (!router) | |
c6c8fea2 SE |
127 | continue; |
128 | ||
2265c141 AQ |
129 | if (!atomic_inc_not_zero(&gw_node->refcount)) |
130 | goto next; | |
131 | ||
c6c8fea2 SE |
132 | switch (atomic_read(&bat_priv->gw_sel_class)) { |
133 | case 1: /* fast connection */ | |
134 | gw_bandwidth_to_kbit(gw_node->orig_node->gw_flags, | |
135 | &down, &up); | |
136 | ||
e1a5382f | 137 | tmp_gw_factor = (router->tq_avg * router->tq_avg * |
c6c8fea2 SE |
138 | down * 100 * 100) / |
139 | (TQ_LOCAL_WINDOW_SIZE * | |
140 | TQ_LOCAL_WINDOW_SIZE * 64); | |
141 | ||
142 | if ((tmp_gw_factor > max_gw_factor) || | |
143 | ((tmp_gw_factor == max_gw_factor) && | |
2265c141 AQ |
144 | (router->tq_avg > max_tq))) { |
145 | if (curr_gw) | |
146 | gw_node_free_ref(curr_gw); | |
147 | curr_gw = gw_node; | |
148 | atomic_inc(&curr_gw->refcount); | |
149 | } | |
c6c8fea2 SE |
150 | break; |
151 | ||
152 | default: /** | |
153 | * 2: stable connection (use best statistic) | |
154 | * 3: fast-switch (use best statistic but change as | |
155 | * soon as a better gateway appears) | |
156 | * XX: late-switch (use best statistic but change as | |
157 | * soon as a better gateway appears which has | |
158 | * $routing_class more tq points) | |
159 | **/ | |
2265c141 AQ |
160 | if (router->tq_avg > max_tq) { |
161 | if (curr_gw) | |
162 | gw_node_free_ref(curr_gw); | |
163 | curr_gw = gw_node; | |
164 | atomic_inc(&curr_gw->refcount); | |
165 | } | |
c6c8fea2 SE |
166 | break; |
167 | } | |
168 | ||
e1a5382f LL |
169 | if (router->tq_avg > max_tq) |
170 | max_tq = router->tq_avg; | |
c6c8fea2 SE |
171 | |
172 | if (tmp_gw_factor > max_gw_factor) | |
173 | max_gw_factor = tmp_gw_factor; | |
e1a5382f | 174 | |
2265c141 AQ |
175 | gw_node_free_ref(gw_node); |
176 | ||
177 | next: | |
e1a5382f | 178 | neigh_node_free_ref(router); |
c6c8fea2 | 179 | } |
2265c141 | 180 | rcu_read_unlock(); |
c6c8fea2 | 181 | |
2265c141 AQ |
182 | return curr_gw; |
183 | } | |
c6c8fea2 | 184 | |
2265c141 AQ |
185 | void gw_election(struct bat_priv *bat_priv) |
186 | { | |
187 | struct gw_node *curr_gw = NULL, *next_gw = NULL; | |
188 | struct neigh_node *router = NULL; | |
19595e05 | 189 | char gw_addr[18] = { '\0' }; |
2265c141 AQ |
190 | |
191 | /** | |
192 | * The batman daemon checks here if we already passed a full originator | |
193 | * cycle in order to make sure we don't choose the first gateway we | |
194 | * hear about. This check is based on the daemon's uptime which we | |
195 | * don't have. | |
196 | **/ | |
197 | if (atomic_read(&bat_priv->gw_mode) != GW_MODE_CLIENT) | |
198 | goto out; | |
199 | ||
200 | if (!atomic_dec_not_zero(&bat_priv->gw_reselect)) | |
201 | goto out; | |
202 | ||
203 | curr_gw = gw_get_selected_gw_node(bat_priv); | |
204 | ||
205 | next_gw = gw_get_best_gw_node(bat_priv); | |
206 | ||
207 | if (curr_gw == next_gw) | |
208 | goto out; | |
209 | ||
210 | if (next_gw) { | |
19595e05 AQ |
211 | sprintf(gw_addr, "%pM", next_gw->orig_node->orig); |
212 | ||
2265c141 AQ |
213 | router = orig_node_get_router(next_gw->orig_node); |
214 | if (!router) { | |
215 | gw_deselect(bat_priv); | |
216 | goto out; | |
217 | } | |
c6c8fea2 SE |
218 | } |
219 | ||
2265c141 AQ |
220 | if ((curr_gw) && (!next_gw)) { |
221 | bat_dbg(DBG_BATMAN, bat_priv, | |
222 | "Removing selected gateway - no gateway in range\n"); | |
19595e05 | 223 | throw_uevent(bat_priv, UEV_GW, UEV_DEL, NULL); |
2265c141 AQ |
224 | } else if ((!curr_gw) && (next_gw)) { |
225 | bat_dbg(DBG_BATMAN, bat_priv, | |
226 | "Adding route to gateway %pM (gw_flags: %i, tq: %i)\n", | |
86ceb360 | 227 | next_gw->orig_node->orig, next_gw->orig_node->gw_flags, |
2265c141 | 228 | router->tq_avg); |
19595e05 | 229 | throw_uevent(bat_priv, UEV_GW, UEV_ADD, gw_addr); |
2265c141 AQ |
230 | } else { |
231 | bat_dbg(DBG_BATMAN, bat_priv, | |
86ceb360 SE |
232 | "Changing route to gateway %pM (gw_flags: %i, tq: %i)\n", |
233 | next_gw->orig_node->orig, next_gw->orig_node->gw_flags, | |
2265c141 | 234 | router->tq_avg); |
19595e05 | 235 | throw_uevent(bat_priv, UEV_GW, UEV_CHANGE, gw_addr); |
2265c141 AQ |
236 | } |
237 | ||
238 | gw_select(bat_priv, next_gw); | |
239 | ||
c4aac1ab ML |
240 | out: |
241 | if (curr_gw) | |
242 | gw_node_free_ref(curr_gw); | |
2265c141 AQ |
243 | if (next_gw) |
244 | gw_node_free_ref(next_gw); | |
245 | if (router) | |
246 | neigh_node_free_ref(router); | |
c6c8fea2 SE |
247 | } |
248 | ||
249 | void gw_check_election(struct bat_priv *bat_priv, struct orig_node *orig_node) | |
250 | { | |
57f0c07c | 251 | struct orig_node *curr_gw_orig; |
e1a5382f | 252 | struct neigh_node *router_gw = NULL, *router_orig = NULL; |
c6c8fea2 SE |
253 | uint8_t gw_tq_avg, orig_tq_avg; |
254 | ||
c4aac1ab | 255 | curr_gw_orig = gw_get_selected_orig(bat_priv); |
57f0c07c LL |
256 | if (!curr_gw_orig) |
257 | goto deselect; | |
c6c8fea2 | 258 | |
e1a5382f LL |
259 | router_gw = orig_node_get_router(curr_gw_orig); |
260 | if (!router_gw) | |
261 | goto deselect; | |
c6c8fea2 SE |
262 | |
263 | /* this node already is the gateway */ | |
57f0c07c | 264 | if (curr_gw_orig == orig_node) |
e1a5382f | 265 | goto out; |
c6c8fea2 | 266 | |
e1a5382f LL |
267 | router_orig = orig_node_get_router(orig_node); |
268 | if (!router_orig) | |
269 | goto out; | |
5d02b3cd | 270 | |
e1a5382f LL |
271 | gw_tq_avg = router_gw->tq_avg; |
272 | orig_tq_avg = router_orig->tq_avg; | |
c6c8fea2 SE |
273 | |
274 | /* the TQ value has to be better */ | |
275 | if (orig_tq_avg < gw_tq_avg) | |
5d02b3cd | 276 | goto out; |
c6c8fea2 SE |
277 | |
278 | /** | |
279 | * if the routing class is greater than 3 the value tells us how much | |
280 | * greater the TQ value of the new gateway must be | |
281 | **/ | |
282 | if ((atomic_read(&bat_priv->gw_sel_class) > 3) && | |
283 | (orig_tq_avg - gw_tq_avg < atomic_read(&bat_priv->gw_sel_class))) | |
5d02b3cd | 284 | goto out; |
c6c8fea2 SE |
285 | |
286 | bat_dbg(DBG_BATMAN, bat_priv, | |
86ceb360 | 287 | "Restarting gateway selection: better gateway found (tq curr: %i, tq new: %i)\n", |
c6c8fea2 SE |
288 | gw_tq_avg, orig_tq_avg); |
289 | ||
290 | deselect: | |
291 | gw_deselect(bat_priv); | |
5d02b3cd | 292 | out: |
57f0c07c LL |
293 | if (curr_gw_orig) |
294 | orig_node_free_ref(curr_gw_orig); | |
e1a5382f LL |
295 | if (router_gw) |
296 | neigh_node_free_ref(router_gw); | |
297 | if (router_orig) | |
298 | neigh_node_free_ref(router_orig); | |
57f0c07c | 299 | |
5d02b3cd | 300 | return; |
c6c8fea2 SE |
301 | } |
302 | ||
303 | static void gw_node_add(struct bat_priv *bat_priv, | |
304 | struct orig_node *orig_node, uint8_t new_gwflags) | |
305 | { | |
306 | struct gw_node *gw_node; | |
307 | int down, up; | |
308 | ||
704509b8 | 309 | gw_node = kzalloc(sizeof(*gw_node), GFP_ATOMIC); |
c6c8fea2 SE |
310 | if (!gw_node) |
311 | return; | |
312 | ||
c6c8fea2 SE |
313 | INIT_HLIST_NODE(&gw_node->list); |
314 | gw_node->orig_node = orig_node; | |
25b6d3c1 | 315 | atomic_set(&gw_node->refcount, 1); |
c6c8fea2 SE |
316 | |
317 | spin_lock_bh(&bat_priv->gw_list_lock); | |
318 | hlist_add_head_rcu(&gw_node->list, &bat_priv->gw_list); | |
319 | spin_unlock_bh(&bat_priv->gw_list_lock); | |
320 | ||
321 | gw_bandwidth_to_kbit(new_gwflags, &down, &up); | |
322 | bat_dbg(DBG_BATMAN, bat_priv, | |
323 | "Found new gateway %pM -> gw_class: %i - %i%s/%i%s\n", | |
324 | orig_node->orig, new_gwflags, | |
325 | (down > 2048 ? down / 1024 : down), | |
326 | (down > 2048 ? "MBit" : "KBit"), | |
327 | (up > 2048 ? up / 1024 : up), | |
328 | (up > 2048 ? "MBit" : "KBit")); | |
329 | } | |
330 | ||
331 | void gw_node_update(struct bat_priv *bat_priv, | |
332 | struct orig_node *orig_node, uint8_t new_gwflags) | |
333 | { | |
334 | struct hlist_node *node; | |
c4aac1ab ML |
335 | struct gw_node *gw_node, *curr_gw; |
336 | ||
71e4aa9c AQ |
337 | /** |
338 | * Note: We don't need a NULL check here, since curr_gw never gets | |
339 | * dereferenced. If curr_gw is NULL we also should not exit as we may | |
340 | * have this gateway in our list (duplication check!) even though we | |
341 | * have no currently selected gateway. | |
342 | */ | |
c4aac1ab | 343 | curr_gw = gw_get_selected_gw_node(bat_priv); |
c6c8fea2 SE |
344 | |
345 | rcu_read_lock(); | |
346 | hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) { | |
347 | if (gw_node->orig_node != orig_node) | |
348 | continue; | |
349 | ||
350 | bat_dbg(DBG_BATMAN, bat_priv, | |
86ceb360 | 351 | "Gateway class of originator %pM changed from %i to %i\n", |
c6c8fea2 SE |
352 | orig_node->orig, gw_node->orig_node->gw_flags, |
353 | new_gwflags); | |
354 | ||
355 | gw_node->deleted = 0; | |
356 | ||
ecbd5321 | 357 | if (new_gwflags == NO_FLAGS) { |
c6c8fea2 SE |
358 | gw_node->deleted = jiffies; |
359 | bat_dbg(DBG_BATMAN, bat_priv, | |
360 | "Gateway %pM removed from gateway list\n", | |
361 | orig_node->orig); | |
362 | ||
c4aac1ab ML |
363 | if (gw_node == curr_gw) |
364 | goto deselect; | |
c6c8fea2 SE |
365 | } |
366 | ||
c4aac1ab | 367 | goto unlock; |
c6c8fea2 | 368 | } |
c6c8fea2 | 369 | |
ecbd5321 | 370 | if (new_gwflags == NO_FLAGS) |
c4aac1ab | 371 | goto unlock; |
c6c8fea2 SE |
372 | |
373 | gw_node_add(bat_priv, orig_node, new_gwflags); | |
c4aac1ab ML |
374 | goto unlock; |
375 | ||
376 | deselect: | |
377 | gw_deselect(bat_priv); | |
378 | unlock: | |
379 | rcu_read_unlock(); | |
71e4aa9c | 380 | |
c4aac1ab ML |
381 | if (curr_gw) |
382 | gw_node_free_ref(curr_gw); | |
c6c8fea2 SE |
383 | } |
384 | ||
385 | void gw_node_delete(struct bat_priv *bat_priv, struct orig_node *orig_node) | |
386 | { | |
6b9aadfa | 387 | gw_node_update(bat_priv, orig_node, 0); |
c6c8fea2 SE |
388 | } |
389 | ||
390 | void gw_node_purge(struct bat_priv *bat_priv) | |
391 | { | |
c4aac1ab | 392 | struct gw_node *gw_node, *curr_gw; |
c6c8fea2 | 393 | struct hlist_node *node, *node_tmp; |
032b7969 | 394 | unsigned long timeout = msecs_to_jiffies(2 * PURGE_TIMEOUT); |
b4e17054 | 395 | int do_deselect = 0; |
c4aac1ab ML |
396 | |
397 | curr_gw = gw_get_selected_gw_node(bat_priv); | |
c6c8fea2 SE |
398 | |
399 | spin_lock_bh(&bat_priv->gw_list_lock); | |
400 | ||
401 | hlist_for_each_entry_safe(gw_node, node, node_tmp, | |
402 | &bat_priv->gw_list, list) { | |
403 | if (((!gw_node->deleted) || | |
404 | (time_before(jiffies, gw_node->deleted + timeout))) && | |
405 | atomic_read(&bat_priv->mesh_state) == MESH_ACTIVE) | |
406 | continue; | |
407 | ||
c4aac1ab ML |
408 | if (curr_gw == gw_node) |
409 | do_deselect = 1; | |
c6c8fea2 SE |
410 | |
411 | hlist_del_rcu(&gw_node->list); | |
25b6d3c1 | 412 | gw_node_free_ref(gw_node); |
c6c8fea2 SE |
413 | } |
414 | ||
c6c8fea2 | 415 | spin_unlock_bh(&bat_priv->gw_list_lock); |
c4aac1ab ML |
416 | |
417 | /* gw_deselect() needs to acquire the gw_list_lock */ | |
418 | if (do_deselect) | |
419 | gw_deselect(bat_priv); | |
420 | ||
421 | if (curr_gw) | |
422 | gw_node_free_ref(curr_gw); | |
c6c8fea2 SE |
423 | } |
424 | ||
e1a5382f LL |
425 | /** |
426 | * fails if orig_node has no router | |
427 | */ | |
747e4221 SE |
428 | static int _write_buffer_text(struct bat_priv *bat_priv, struct seq_file *seq, |
429 | const struct gw_node *gw_node) | |
c6c8fea2 | 430 | { |
5d02b3cd | 431 | struct gw_node *curr_gw; |
e1a5382f LL |
432 | struct neigh_node *router; |
433 | int down, up, ret = -1; | |
c6c8fea2 SE |
434 | |
435 | gw_bandwidth_to_kbit(gw_node->orig_node->gw_flags, &down, &up); | |
436 | ||
e1a5382f LL |
437 | router = orig_node_get_router(gw_node->orig_node); |
438 | if (!router) | |
439 | goto out; | |
5d02b3cd | 440 | |
c4aac1ab | 441 | curr_gw = gw_get_selected_gw_node(bat_priv); |
5d02b3cd | 442 | |
5d02b3cd | 443 | ret = seq_printf(seq, "%s %pM (%3i) %pM [%10s]: %3i - %i%s/%i%s\n", |
c4aac1ab ML |
444 | (curr_gw == gw_node ? "=>" : " "), |
445 | gw_node->orig_node->orig, | |
446 | router->tq_avg, router->addr, | |
447 | router->if_incoming->net_dev->name, | |
448 | gw_node->orig_node->gw_flags, | |
449 | (down > 2048 ? down / 1024 : down), | |
450 | (down > 2048 ? "MBit" : "KBit"), | |
451 | (up > 2048 ? up / 1024 : up), | |
452 | (up > 2048 ? "MBit" : "KBit")); | |
5d02b3cd | 453 | |
e1a5382f | 454 | neigh_node_free_ref(router); |
c4aac1ab ML |
455 | if (curr_gw) |
456 | gw_node_free_ref(curr_gw); | |
e1a5382f | 457 | out: |
5d02b3cd | 458 | return ret; |
c6c8fea2 SE |
459 | } |
460 | ||
461 | int gw_client_seq_print_text(struct seq_file *seq, void *offset) | |
462 | { | |
463 | struct net_device *net_dev = (struct net_device *)seq->private; | |
464 | struct bat_priv *bat_priv = netdev_priv(net_dev); | |
32ae9b22 | 465 | struct hard_iface *primary_if; |
c6c8fea2 SE |
466 | struct gw_node *gw_node; |
467 | struct hlist_node *node; | |
32ae9b22 | 468 | int gw_count = 0, ret = 0; |
c6c8fea2 | 469 | |
32ae9b22 ML |
470 | primary_if = primary_if_get_selected(bat_priv); |
471 | if (!primary_if) { | |
86ceb360 SE |
472 | ret = seq_printf(seq, |
473 | "BATMAN mesh %s disabled - please specify interfaces to enable it\n", | |
32ae9b22 ML |
474 | net_dev->name); |
475 | goto out; | |
c6c8fea2 SE |
476 | } |
477 | ||
32ae9b22 | 478 | if (primary_if->if_status != IF_ACTIVE) { |
86ceb360 SE |
479 | ret = seq_printf(seq, |
480 | "BATMAN mesh %s disabled - primary interface not active\n", | |
32ae9b22 ML |
481 | net_dev->name); |
482 | goto out; | |
c6c8fea2 SE |
483 | } |
484 | ||
86ceb360 SE |
485 | seq_printf(seq, |
486 | " %-12s (%s/%i) %17s [%10s]: gw_class ... [B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s)]\n", | |
487 | "Gateway", "#", TQ_MAX_VALUE, "Nexthop", "outgoingIF", | |
488 | SOURCE_VERSION, primary_if->net_dev->name, | |
32ae9b22 | 489 | primary_if->net_dev->dev_addr, net_dev->name); |
c6c8fea2 SE |
490 | |
491 | rcu_read_lock(); | |
492 | hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) { | |
493 | if (gw_node->deleted) | |
494 | continue; | |
495 | ||
e1a5382f LL |
496 | /* fails if orig_node has no router */ |
497 | if (_write_buffer_text(bat_priv, seq, gw_node) < 0) | |
c6c8fea2 SE |
498 | continue; |
499 | ||
c6c8fea2 SE |
500 | gw_count++; |
501 | } | |
502 | rcu_read_unlock(); | |
503 | ||
504 | if (gw_count == 0) | |
505 | seq_printf(seq, "No gateways in range ...\n"); | |
506 | ||
32ae9b22 ML |
507 | out: |
508 | if (primary_if) | |
509 | hardif_free_ref(primary_if); | |
510 | return ret; | |
c6c8fea2 SE |
511 | } |
512 | ||
43676ab5 AQ |
513 | static bool is_type_dhcprequest(struct sk_buff *skb, int header_len) |
514 | { | |
515 | int ret = false; | |
516 | unsigned char *p; | |
517 | int pkt_len; | |
518 | ||
519 | if (skb_linearize(skb) < 0) | |
520 | goto out; | |
521 | ||
522 | pkt_len = skb_headlen(skb); | |
523 | ||
524 | if (pkt_len < header_len + DHCP_OPTIONS_OFFSET + 1) | |
525 | goto out; | |
526 | ||
527 | p = skb->data + header_len + DHCP_OPTIONS_OFFSET; | |
528 | pkt_len -= header_len + DHCP_OPTIONS_OFFSET + 1; | |
529 | ||
530 | /* Access the dhcp option lists. Each entry is made up by: | |
015758d0 AQ |
531 | * - octet 1: option type |
532 | * - octet 2: option data len (only if type != 255 and 0) | |
533 | * - octet 3: option data */ | |
43676ab5 | 534 | while (*p != 255 && !ret) { |
015758d0 | 535 | /* p now points to the first octet: option type */ |
43676ab5 AQ |
536 | if (*p == 53) { |
537 | /* type 53 is the message type option. | |
015758d0 | 538 | * Jump the len octet and go to the data octet */ |
43676ab5 AQ |
539 | if (pkt_len < 2) |
540 | goto out; | |
541 | p += 2; | |
542 | ||
543 | /* check if the message type is what we need */ | |
544 | if (*p == DHCP_REQUEST) | |
545 | ret = true; | |
546 | break; | |
547 | } else if (*p == 0) { | |
548 | /* option type 0 (padding), just go forward */ | |
549 | if (pkt_len < 1) | |
550 | goto out; | |
551 | pkt_len--; | |
552 | p++; | |
553 | } else { | |
554 | /* This is any other option. So we get the length... */ | |
555 | if (pkt_len < 1) | |
556 | goto out; | |
557 | pkt_len--; | |
558 | p++; | |
559 | ||
560 | /* ...and then we jump over the data */ | |
561 | if (pkt_len < *p) | |
562 | goto out; | |
563 | pkt_len -= *p; | |
564 | p += (*p); | |
565 | } | |
566 | } | |
567 | out: | |
568 | return ret; | |
569 | } | |
570 | ||
be7af5cf | 571 | bool gw_is_dhcp_target(struct sk_buff *skb, unsigned int *header_len) |
c6c8fea2 SE |
572 | { |
573 | struct ethhdr *ethhdr; | |
574 | struct iphdr *iphdr; | |
575 | struct ipv6hdr *ipv6hdr; | |
576 | struct udphdr *udphdr; | |
c6c8fea2 SE |
577 | |
578 | /* check for ethernet header */ | |
be7af5cf ML |
579 | if (!pskb_may_pull(skb, *header_len + ETH_HLEN)) |
580 | return false; | |
c6c8fea2 | 581 | ethhdr = (struct ethhdr *)skb->data; |
be7af5cf | 582 | *header_len += ETH_HLEN; |
c6c8fea2 SE |
583 | |
584 | /* check for initial vlan header */ | |
585 | if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) { | |
be7af5cf ML |
586 | if (!pskb_may_pull(skb, *header_len + VLAN_HLEN)) |
587 | return false; | |
c6c8fea2 | 588 | ethhdr = (struct ethhdr *)(skb->data + VLAN_HLEN); |
be7af5cf | 589 | *header_len += VLAN_HLEN; |
c6c8fea2 SE |
590 | } |
591 | ||
592 | /* check for ip header */ | |
593 | switch (ntohs(ethhdr->h_proto)) { | |
594 | case ETH_P_IP: | |
be7af5cf ML |
595 | if (!pskb_may_pull(skb, *header_len + sizeof(*iphdr))) |
596 | return false; | |
597 | iphdr = (struct iphdr *)(skb->data + *header_len); | |
598 | *header_len += iphdr->ihl * 4; | |
c6c8fea2 SE |
599 | |
600 | /* check for udp header */ | |
601 | if (iphdr->protocol != IPPROTO_UDP) | |
be7af5cf | 602 | return false; |
c6c8fea2 SE |
603 | |
604 | break; | |
605 | case ETH_P_IPV6: | |
be7af5cf ML |
606 | if (!pskb_may_pull(skb, *header_len + sizeof(*ipv6hdr))) |
607 | return false; | |
608 | ipv6hdr = (struct ipv6hdr *)(skb->data + *header_len); | |
609 | *header_len += sizeof(*ipv6hdr); | |
c6c8fea2 SE |
610 | |
611 | /* check for udp header */ | |
612 | if (ipv6hdr->nexthdr != IPPROTO_UDP) | |
be7af5cf | 613 | return false; |
c6c8fea2 SE |
614 | |
615 | break; | |
616 | default: | |
be7af5cf | 617 | return false; |
c6c8fea2 SE |
618 | } |
619 | ||
be7af5cf ML |
620 | if (!pskb_may_pull(skb, *header_len + sizeof(*udphdr))) |
621 | return false; | |
622 | udphdr = (struct udphdr *)(skb->data + *header_len); | |
623 | *header_len += sizeof(*udphdr); | |
c6c8fea2 SE |
624 | |
625 | /* check for bootp port */ | |
626 | if ((ntohs(ethhdr->h_proto) == ETH_P_IP) && | |
7c64fd98 | 627 | (ntohs(udphdr->dest) != 67)) |
be7af5cf | 628 | return false; |
c6c8fea2 SE |
629 | |
630 | if ((ntohs(ethhdr->h_proto) == ETH_P_IPV6) && | |
631 | (ntohs(udphdr->dest) != 547)) | |
be7af5cf | 632 | return false; |
c6c8fea2 | 633 | |
be7af5cf ML |
634 | return true; |
635 | } | |
c6c8fea2 | 636 | |
be7af5cf ML |
637 | bool gw_out_of_range(struct bat_priv *bat_priv, |
638 | struct sk_buff *skb, struct ethhdr *ethhdr) | |
639 | { | |
640 | struct neigh_node *neigh_curr = NULL, *neigh_old = NULL; | |
641 | struct orig_node *orig_dst_node = NULL; | |
642 | struct gw_node *curr_gw = NULL; | |
643 | bool ret, out_of_range = false; | |
644 | unsigned int header_len = 0; | |
645 | uint8_t curr_tq_avg; | |
646 | ||
647 | ret = gw_is_dhcp_target(skb, &header_len); | |
648 | if (!ret) | |
649 | goto out; | |
650 | ||
651 | orig_dst_node = transtable_search(bat_priv, ethhdr->h_source, | |
652 | ethhdr->h_dest); | |
653 | if (!orig_dst_node) | |
654 | goto out; | |
655 | ||
656 | if (!orig_dst_node->gw_flags) | |
657 | goto out; | |
658 | ||
659 | ret = is_type_dhcprequest(skb, header_len); | |
660 | if (!ret) | |
661 | goto out; | |
662 | ||
663 | switch (atomic_read(&bat_priv->gw_mode)) { | |
664 | case GW_MODE_SERVER: | |
665 | /* If we are a GW then we are our best GW. We can artificially | |
666 | * set the tq towards ourself as the maximum value */ | |
667 | curr_tq_avg = TQ_MAX_VALUE; | |
668 | break; | |
669 | case GW_MODE_CLIENT: | |
670 | curr_gw = gw_get_selected_gw_node(bat_priv); | |
671 | if (!curr_gw) | |
672 | goto out; | |
673 | ||
674 | /* packet is going to our gateway */ | |
675 | if (curr_gw->orig_node == orig_dst_node) | |
676 | goto out; | |
677 | ||
678 | /* If the dhcp packet has been sent to a different gw, | |
679 | * we have to evaluate whether the old gw is still | |
680 | * reliable enough */ | |
681 | neigh_curr = find_router(bat_priv, curr_gw->orig_node, NULL); | |
682 | if (!neigh_curr) | |
683 | goto out; | |
684 | ||
685 | curr_tq_avg = neigh_curr->tq_avg; | |
686 | break; | |
687 | case GW_MODE_OFF: | |
688 | default: | |
689 | goto out; | |
43676ab5 | 690 | } |
be7af5cf ML |
691 | |
692 | neigh_old = find_router(bat_priv, orig_dst_node, NULL); | |
2ef04f47 | 693 | if (!neigh_old) |
be7af5cf ML |
694 | goto out; |
695 | ||
696 | if (curr_tq_avg - neigh_old->tq_avg > GW_THRESHOLD) | |
697 | out_of_range = true; | |
698 | ||
699 | out: | |
700 | if (orig_dst_node) | |
701 | orig_node_free_ref(orig_dst_node); | |
702 | if (curr_gw) | |
703 | gw_node_free_ref(curr_gw); | |
43676ab5 AQ |
704 | if (neigh_old) |
705 | neigh_node_free_ref(neigh_old); | |
706 | if (neigh_curr) | |
707 | neigh_node_free_ref(neigh_curr); | |
be7af5cf | 708 | return out_of_range; |
c6c8fea2 | 709 | } |