Commit | Line | Data |
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c6c8fea2 | 1 | /* |
64afe353 | 2 | * Copyright (C) 2009-2011 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", | |
227 | next_gw->orig_node->orig, | |
228 | next_gw->orig_node->gw_flags, | |
229 | router->tq_avg); | |
19595e05 | 230 | throw_uevent(bat_priv, UEV_GW, UEV_ADD, gw_addr); |
2265c141 AQ |
231 | } else { |
232 | bat_dbg(DBG_BATMAN, bat_priv, | |
233 | "Changing route to gateway %pM " | |
234 | "(gw_flags: %i, tq: %i)\n", | |
235 | next_gw->orig_node->orig, | |
236 | next_gw->orig_node->gw_flags, | |
237 | router->tq_avg); | |
19595e05 | 238 | throw_uevent(bat_priv, UEV_GW, UEV_CHANGE, gw_addr); |
2265c141 AQ |
239 | } |
240 | ||
241 | gw_select(bat_priv, next_gw); | |
242 | ||
c4aac1ab ML |
243 | out: |
244 | if (curr_gw) | |
245 | gw_node_free_ref(curr_gw); | |
2265c141 AQ |
246 | if (next_gw) |
247 | gw_node_free_ref(next_gw); | |
248 | if (router) | |
249 | neigh_node_free_ref(router); | |
c6c8fea2 SE |
250 | } |
251 | ||
252 | void gw_check_election(struct bat_priv *bat_priv, struct orig_node *orig_node) | |
253 | { | |
57f0c07c | 254 | struct orig_node *curr_gw_orig; |
e1a5382f | 255 | struct neigh_node *router_gw = NULL, *router_orig = NULL; |
c6c8fea2 SE |
256 | uint8_t gw_tq_avg, orig_tq_avg; |
257 | ||
c4aac1ab | 258 | curr_gw_orig = gw_get_selected_orig(bat_priv); |
57f0c07c LL |
259 | if (!curr_gw_orig) |
260 | goto deselect; | |
c6c8fea2 | 261 | |
e1a5382f LL |
262 | router_gw = orig_node_get_router(curr_gw_orig); |
263 | if (!router_gw) | |
264 | goto deselect; | |
c6c8fea2 SE |
265 | |
266 | /* this node already is the gateway */ | |
57f0c07c | 267 | if (curr_gw_orig == orig_node) |
e1a5382f | 268 | goto out; |
c6c8fea2 | 269 | |
e1a5382f LL |
270 | router_orig = orig_node_get_router(orig_node); |
271 | if (!router_orig) | |
272 | goto out; | |
5d02b3cd | 273 | |
e1a5382f LL |
274 | gw_tq_avg = router_gw->tq_avg; |
275 | orig_tq_avg = router_orig->tq_avg; | |
c6c8fea2 SE |
276 | |
277 | /* the TQ value has to be better */ | |
278 | if (orig_tq_avg < gw_tq_avg) | |
5d02b3cd | 279 | goto out; |
c6c8fea2 SE |
280 | |
281 | /** | |
282 | * if the routing class is greater than 3 the value tells us how much | |
283 | * greater the TQ value of the new gateway must be | |
284 | **/ | |
285 | if ((atomic_read(&bat_priv->gw_sel_class) > 3) && | |
286 | (orig_tq_avg - gw_tq_avg < atomic_read(&bat_priv->gw_sel_class))) | |
5d02b3cd | 287 | goto out; |
c6c8fea2 SE |
288 | |
289 | bat_dbg(DBG_BATMAN, bat_priv, | |
290 | "Restarting gateway selection: better gateway found (tq curr: " | |
291 | "%i, tq new: %i)\n", | |
292 | gw_tq_avg, orig_tq_avg); | |
293 | ||
294 | deselect: | |
295 | gw_deselect(bat_priv); | |
5d02b3cd | 296 | out: |
57f0c07c LL |
297 | if (curr_gw_orig) |
298 | orig_node_free_ref(curr_gw_orig); | |
e1a5382f LL |
299 | if (router_gw) |
300 | neigh_node_free_ref(router_gw); | |
301 | if (router_orig) | |
302 | neigh_node_free_ref(router_orig); | |
57f0c07c | 303 | |
5d02b3cd | 304 | return; |
c6c8fea2 SE |
305 | } |
306 | ||
307 | static void gw_node_add(struct bat_priv *bat_priv, | |
308 | struct orig_node *orig_node, uint8_t new_gwflags) | |
309 | { | |
310 | struct gw_node *gw_node; | |
311 | int down, up; | |
312 | ||
704509b8 | 313 | gw_node = kzalloc(sizeof(*gw_node), GFP_ATOMIC); |
c6c8fea2 SE |
314 | if (!gw_node) |
315 | return; | |
316 | ||
c6c8fea2 SE |
317 | INIT_HLIST_NODE(&gw_node->list); |
318 | gw_node->orig_node = orig_node; | |
25b6d3c1 | 319 | atomic_set(&gw_node->refcount, 1); |
c6c8fea2 SE |
320 | |
321 | spin_lock_bh(&bat_priv->gw_list_lock); | |
322 | hlist_add_head_rcu(&gw_node->list, &bat_priv->gw_list); | |
323 | spin_unlock_bh(&bat_priv->gw_list_lock); | |
324 | ||
325 | gw_bandwidth_to_kbit(new_gwflags, &down, &up); | |
326 | bat_dbg(DBG_BATMAN, bat_priv, | |
327 | "Found new gateway %pM -> gw_class: %i - %i%s/%i%s\n", | |
328 | orig_node->orig, new_gwflags, | |
329 | (down > 2048 ? down / 1024 : down), | |
330 | (down > 2048 ? "MBit" : "KBit"), | |
331 | (up > 2048 ? up / 1024 : up), | |
332 | (up > 2048 ? "MBit" : "KBit")); | |
333 | } | |
334 | ||
335 | void gw_node_update(struct bat_priv *bat_priv, | |
336 | struct orig_node *orig_node, uint8_t new_gwflags) | |
337 | { | |
338 | struct hlist_node *node; | |
c4aac1ab ML |
339 | struct gw_node *gw_node, *curr_gw; |
340 | ||
71e4aa9c AQ |
341 | /** |
342 | * Note: We don't need a NULL check here, since curr_gw never gets | |
343 | * dereferenced. If curr_gw is NULL we also should not exit as we may | |
344 | * have this gateway in our list (duplication check!) even though we | |
345 | * have no currently selected gateway. | |
346 | */ | |
c4aac1ab | 347 | curr_gw = gw_get_selected_gw_node(bat_priv); |
c6c8fea2 SE |
348 | |
349 | rcu_read_lock(); | |
350 | hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) { | |
351 | if (gw_node->orig_node != orig_node) | |
352 | continue; | |
353 | ||
354 | bat_dbg(DBG_BATMAN, bat_priv, | |
355 | "Gateway class of originator %pM changed from " | |
356 | "%i to %i\n", | |
357 | orig_node->orig, gw_node->orig_node->gw_flags, | |
358 | new_gwflags); | |
359 | ||
360 | gw_node->deleted = 0; | |
361 | ||
ecbd5321 | 362 | if (new_gwflags == NO_FLAGS) { |
c6c8fea2 SE |
363 | gw_node->deleted = jiffies; |
364 | bat_dbg(DBG_BATMAN, bat_priv, | |
365 | "Gateway %pM removed from gateway list\n", | |
366 | orig_node->orig); | |
367 | ||
c4aac1ab ML |
368 | if (gw_node == curr_gw) |
369 | goto deselect; | |
c6c8fea2 SE |
370 | } |
371 | ||
c4aac1ab | 372 | goto unlock; |
c6c8fea2 | 373 | } |
c6c8fea2 | 374 | |
ecbd5321 | 375 | if (new_gwflags == NO_FLAGS) |
c4aac1ab | 376 | goto unlock; |
c6c8fea2 SE |
377 | |
378 | gw_node_add(bat_priv, orig_node, new_gwflags); | |
c4aac1ab ML |
379 | goto unlock; |
380 | ||
381 | deselect: | |
382 | gw_deselect(bat_priv); | |
383 | unlock: | |
384 | rcu_read_unlock(); | |
71e4aa9c | 385 | |
c4aac1ab ML |
386 | if (curr_gw) |
387 | gw_node_free_ref(curr_gw); | |
c6c8fea2 SE |
388 | } |
389 | ||
390 | void gw_node_delete(struct bat_priv *bat_priv, struct orig_node *orig_node) | |
391 | { | |
6b9aadfa | 392 | gw_node_update(bat_priv, orig_node, 0); |
c6c8fea2 SE |
393 | } |
394 | ||
395 | void gw_node_purge(struct bat_priv *bat_priv) | |
396 | { | |
c4aac1ab | 397 | struct gw_node *gw_node, *curr_gw; |
c6c8fea2 SE |
398 | struct hlist_node *node, *node_tmp; |
399 | unsigned long timeout = 2 * PURGE_TIMEOUT * HZ; | |
b4e17054 | 400 | int do_deselect = 0; |
c4aac1ab ML |
401 | |
402 | curr_gw = gw_get_selected_gw_node(bat_priv); | |
c6c8fea2 SE |
403 | |
404 | spin_lock_bh(&bat_priv->gw_list_lock); | |
405 | ||
406 | hlist_for_each_entry_safe(gw_node, node, node_tmp, | |
407 | &bat_priv->gw_list, list) { | |
408 | if (((!gw_node->deleted) || | |
409 | (time_before(jiffies, gw_node->deleted + timeout))) && | |
410 | atomic_read(&bat_priv->mesh_state) == MESH_ACTIVE) | |
411 | continue; | |
412 | ||
c4aac1ab ML |
413 | if (curr_gw == gw_node) |
414 | do_deselect = 1; | |
c6c8fea2 SE |
415 | |
416 | hlist_del_rcu(&gw_node->list); | |
25b6d3c1 | 417 | gw_node_free_ref(gw_node); |
c6c8fea2 SE |
418 | } |
419 | ||
c6c8fea2 | 420 | spin_unlock_bh(&bat_priv->gw_list_lock); |
c4aac1ab ML |
421 | |
422 | /* gw_deselect() needs to acquire the gw_list_lock */ | |
423 | if (do_deselect) | |
424 | gw_deselect(bat_priv); | |
425 | ||
426 | if (curr_gw) | |
427 | gw_node_free_ref(curr_gw); | |
c6c8fea2 SE |
428 | } |
429 | ||
e1a5382f LL |
430 | /** |
431 | * fails if orig_node has no router | |
432 | */ | |
747e4221 SE |
433 | static int _write_buffer_text(struct bat_priv *bat_priv, struct seq_file *seq, |
434 | const struct gw_node *gw_node) | |
c6c8fea2 | 435 | { |
5d02b3cd | 436 | struct gw_node *curr_gw; |
e1a5382f LL |
437 | struct neigh_node *router; |
438 | int down, up, ret = -1; | |
c6c8fea2 SE |
439 | |
440 | gw_bandwidth_to_kbit(gw_node->orig_node->gw_flags, &down, &up); | |
441 | ||
e1a5382f LL |
442 | router = orig_node_get_router(gw_node->orig_node); |
443 | if (!router) | |
444 | goto out; | |
5d02b3cd | 445 | |
c4aac1ab | 446 | curr_gw = gw_get_selected_gw_node(bat_priv); |
5d02b3cd | 447 | |
5d02b3cd | 448 | ret = seq_printf(seq, "%s %pM (%3i) %pM [%10s]: %3i - %i%s/%i%s\n", |
c4aac1ab ML |
449 | (curr_gw == gw_node ? "=>" : " "), |
450 | gw_node->orig_node->orig, | |
451 | router->tq_avg, router->addr, | |
452 | router->if_incoming->net_dev->name, | |
453 | gw_node->orig_node->gw_flags, | |
454 | (down > 2048 ? down / 1024 : down), | |
455 | (down > 2048 ? "MBit" : "KBit"), | |
456 | (up > 2048 ? up / 1024 : up), | |
457 | (up > 2048 ? "MBit" : "KBit")); | |
5d02b3cd | 458 | |
e1a5382f | 459 | neigh_node_free_ref(router); |
c4aac1ab ML |
460 | if (curr_gw) |
461 | gw_node_free_ref(curr_gw); | |
e1a5382f | 462 | out: |
5d02b3cd | 463 | return ret; |
c6c8fea2 SE |
464 | } |
465 | ||
466 | int gw_client_seq_print_text(struct seq_file *seq, void *offset) | |
467 | { | |
468 | struct net_device *net_dev = (struct net_device *)seq->private; | |
469 | struct bat_priv *bat_priv = netdev_priv(net_dev); | |
32ae9b22 | 470 | struct hard_iface *primary_if; |
c6c8fea2 SE |
471 | struct gw_node *gw_node; |
472 | struct hlist_node *node; | |
32ae9b22 | 473 | int gw_count = 0, ret = 0; |
c6c8fea2 | 474 | |
32ae9b22 ML |
475 | primary_if = primary_if_get_selected(bat_priv); |
476 | if (!primary_if) { | |
477 | ret = seq_printf(seq, "BATMAN mesh %s disabled - please " | |
478 | "specify interfaces to enable it\n", | |
479 | net_dev->name); | |
480 | goto out; | |
c6c8fea2 SE |
481 | } |
482 | ||
32ae9b22 ML |
483 | if (primary_if->if_status != IF_ACTIVE) { |
484 | ret = seq_printf(seq, "BATMAN mesh %s disabled - " | |
485 | "primary interface not active\n", | |
486 | net_dev->name); | |
487 | goto out; | |
c6c8fea2 SE |
488 | } |
489 | ||
490 | seq_printf(seq, " %-12s (%s/%i) %17s [%10s]: gw_class ... " | |
44c4349a | 491 | "[B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s)]\n", |
c6c8fea2 | 492 | "Gateway", "#", TQ_MAX_VALUE, "Nexthop", |
44c4349a | 493 | "outgoingIF", SOURCE_VERSION, primary_if->net_dev->name, |
32ae9b22 | 494 | primary_if->net_dev->dev_addr, net_dev->name); |
c6c8fea2 SE |
495 | |
496 | rcu_read_lock(); | |
497 | hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) { | |
498 | if (gw_node->deleted) | |
499 | continue; | |
500 | ||
e1a5382f LL |
501 | /* fails if orig_node has no router */ |
502 | if (_write_buffer_text(bat_priv, seq, gw_node) < 0) | |
c6c8fea2 SE |
503 | continue; |
504 | ||
c6c8fea2 SE |
505 | gw_count++; |
506 | } | |
507 | rcu_read_unlock(); | |
508 | ||
509 | if (gw_count == 0) | |
510 | seq_printf(seq, "No gateways in range ...\n"); | |
511 | ||
32ae9b22 ML |
512 | out: |
513 | if (primary_if) | |
514 | hardif_free_ref(primary_if); | |
515 | return ret; | |
c6c8fea2 SE |
516 | } |
517 | ||
43676ab5 AQ |
518 | static bool is_type_dhcprequest(struct sk_buff *skb, int header_len) |
519 | { | |
520 | int ret = false; | |
521 | unsigned char *p; | |
522 | int pkt_len; | |
523 | ||
524 | if (skb_linearize(skb) < 0) | |
525 | goto out; | |
526 | ||
527 | pkt_len = skb_headlen(skb); | |
528 | ||
529 | if (pkt_len < header_len + DHCP_OPTIONS_OFFSET + 1) | |
530 | goto out; | |
531 | ||
532 | p = skb->data + header_len + DHCP_OPTIONS_OFFSET; | |
533 | pkt_len -= header_len + DHCP_OPTIONS_OFFSET + 1; | |
534 | ||
535 | /* Access the dhcp option lists. Each entry is made up by: | |
015758d0 AQ |
536 | * - octet 1: option type |
537 | * - octet 2: option data len (only if type != 255 and 0) | |
538 | * - octet 3: option data */ | |
43676ab5 | 539 | while (*p != 255 && !ret) { |
015758d0 | 540 | /* p now points to the first octet: option type */ |
43676ab5 AQ |
541 | if (*p == 53) { |
542 | /* type 53 is the message type option. | |
015758d0 | 543 | * Jump the len octet and go to the data octet */ |
43676ab5 AQ |
544 | if (pkt_len < 2) |
545 | goto out; | |
546 | p += 2; | |
547 | ||
548 | /* check if the message type is what we need */ | |
549 | if (*p == DHCP_REQUEST) | |
550 | ret = true; | |
551 | break; | |
552 | } else if (*p == 0) { | |
553 | /* option type 0 (padding), just go forward */ | |
554 | if (pkt_len < 1) | |
555 | goto out; | |
556 | pkt_len--; | |
557 | p++; | |
558 | } else { | |
559 | /* This is any other option. So we get the length... */ | |
560 | if (pkt_len < 1) | |
561 | goto out; | |
562 | pkt_len--; | |
563 | p++; | |
564 | ||
565 | /* ...and then we jump over the data */ | |
566 | if (pkt_len < *p) | |
567 | goto out; | |
568 | pkt_len -= *p; | |
569 | p += (*p); | |
570 | } | |
571 | } | |
572 | out: | |
573 | return ret; | |
574 | } | |
575 | ||
be7af5cf | 576 | bool gw_is_dhcp_target(struct sk_buff *skb, unsigned int *header_len) |
c6c8fea2 SE |
577 | { |
578 | struct ethhdr *ethhdr; | |
579 | struct iphdr *iphdr; | |
580 | struct ipv6hdr *ipv6hdr; | |
581 | struct udphdr *udphdr; | |
c6c8fea2 SE |
582 | |
583 | /* check for ethernet header */ | |
be7af5cf ML |
584 | if (!pskb_may_pull(skb, *header_len + ETH_HLEN)) |
585 | return false; | |
c6c8fea2 | 586 | ethhdr = (struct ethhdr *)skb->data; |
be7af5cf | 587 | *header_len += ETH_HLEN; |
c6c8fea2 SE |
588 | |
589 | /* check for initial vlan header */ | |
590 | if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) { | |
be7af5cf ML |
591 | if (!pskb_may_pull(skb, *header_len + VLAN_HLEN)) |
592 | return false; | |
c6c8fea2 | 593 | ethhdr = (struct ethhdr *)(skb->data + VLAN_HLEN); |
be7af5cf | 594 | *header_len += VLAN_HLEN; |
c6c8fea2 SE |
595 | } |
596 | ||
597 | /* check for ip header */ | |
598 | switch (ntohs(ethhdr->h_proto)) { | |
599 | case ETH_P_IP: | |
be7af5cf ML |
600 | if (!pskb_may_pull(skb, *header_len + sizeof(*iphdr))) |
601 | return false; | |
602 | iphdr = (struct iphdr *)(skb->data + *header_len); | |
603 | *header_len += iphdr->ihl * 4; | |
c6c8fea2 SE |
604 | |
605 | /* check for udp header */ | |
606 | if (iphdr->protocol != IPPROTO_UDP) | |
be7af5cf | 607 | return false; |
c6c8fea2 SE |
608 | |
609 | break; | |
610 | case ETH_P_IPV6: | |
be7af5cf ML |
611 | if (!pskb_may_pull(skb, *header_len + sizeof(*ipv6hdr))) |
612 | return false; | |
613 | ipv6hdr = (struct ipv6hdr *)(skb->data + *header_len); | |
614 | *header_len += sizeof(*ipv6hdr); | |
c6c8fea2 SE |
615 | |
616 | /* check for udp header */ | |
617 | if (ipv6hdr->nexthdr != IPPROTO_UDP) | |
be7af5cf | 618 | return false; |
c6c8fea2 SE |
619 | |
620 | break; | |
621 | default: | |
be7af5cf | 622 | return false; |
c6c8fea2 SE |
623 | } |
624 | ||
be7af5cf ML |
625 | if (!pskb_may_pull(skb, *header_len + sizeof(*udphdr))) |
626 | return false; | |
627 | udphdr = (struct udphdr *)(skb->data + *header_len); | |
628 | *header_len += sizeof(*udphdr); | |
c6c8fea2 SE |
629 | |
630 | /* check for bootp port */ | |
631 | if ((ntohs(ethhdr->h_proto) == ETH_P_IP) && | |
632 | (ntohs(udphdr->dest) != 67)) | |
be7af5cf | 633 | return false; |
c6c8fea2 SE |
634 | |
635 | if ((ntohs(ethhdr->h_proto) == ETH_P_IPV6) && | |
636 | (ntohs(udphdr->dest) != 547)) | |
be7af5cf | 637 | return false; |
c6c8fea2 | 638 | |
be7af5cf ML |
639 | return true; |
640 | } | |
c6c8fea2 | 641 | |
be7af5cf ML |
642 | bool gw_out_of_range(struct bat_priv *bat_priv, |
643 | struct sk_buff *skb, struct ethhdr *ethhdr) | |
644 | { | |
645 | struct neigh_node *neigh_curr = NULL, *neigh_old = NULL; | |
646 | struct orig_node *orig_dst_node = NULL; | |
647 | struct gw_node *curr_gw = NULL; | |
648 | bool ret, out_of_range = false; | |
649 | unsigned int header_len = 0; | |
650 | uint8_t curr_tq_avg; | |
651 | ||
652 | ret = gw_is_dhcp_target(skb, &header_len); | |
653 | if (!ret) | |
654 | goto out; | |
655 | ||
656 | orig_dst_node = transtable_search(bat_priv, ethhdr->h_source, | |
657 | ethhdr->h_dest); | |
658 | if (!orig_dst_node) | |
659 | goto out; | |
660 | ||
661 | if (!orig_dst_node->gw_flags) | |
662 | goto out; | |
663 | ||
664 | ret = is_type_dhcprequest(skb, header_len); | |
665 | if (!ret) | |
666 | goto out; | |
667 | ||
668 | switch (atomic_read(&bat_priv->gw_mode)) { | |
669 | case GW_MODE_SERVER: | |
670 | /* If we are a GW then we are our best GW. We can artificially | |
671 | * set the tq towards ourself as the maximum value */ | |
672 | curr_tq_avg = TQ_MAX_VALUE; | |
673 | break; | |
674 | case GW_MODE_CLIENT: | |
675 | curr_gw = gw_get_selected_gw_node(bat_priv); | |
676 | if (!curr_gw) | |
677 | goto out; | |
678 | ||
679 | /* packet is going to our gateway */ | |
680 | if (curr_gw->orig_node == orig_dst_node) | |
681 | goto out; | |
682 | ||
683 | /* If the dhcp packet has been sent to a different gw, | |
684 | * we have to evaluate whether the old gw is still | |
685 | * reliable enough */ | |
686 | neigh_curr = find_router(bat_priv, curr_gw->orig_node, NULL); | |
687 | if (!neigh_curr) | |
688 | goto out; | |
689 | ||
690 | curr_tq_avg = neigh_curr->tq_avg; | |
691 | break; | |
692 | case GW_MODE_OFF: | |
693 | default: | |
694 | goto out; | |
43676ab5 | 695 | } |
be7af5cf ML |
696 | |
697 | neigh_old = find_router(bat_priv, orig_dst_node, NULL); | |
698 | if (!!neigh_old) | |
699 | goto out; | |
700 | ||
701 | if (curr_tq_avg - neigh_old->tq_avg > GW_THRESHOLD) | |
702 | out_of_range = true; | |
703 | ||
704 | out: | |
705 | if (orig_dst_node) | |
706 | orig_node_free_ref(orig_dst_node); | |
707 | if (curr_gw) | |
708 | gw_node_free_ref(curr_gw); | |
43676ab5 AQ |
709 | if (neigh_old) |
710 | neigh_node_free_ref(neigh_old); | |
711 | if (neigh_curr) | |
712 | neigh_node_free_ref(neigh_curr); | |
be7af5cf | 713 | return out_of_range; |
c6c8fea2 | 714 | } |