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 | ||
7cf06bc6 | 63 | struct orig_node *batadv_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 | ||
7cf06bc6 | 106 | void batadv_gw_deselect(struct bat_priv *bat_priv) |
c4aac1ab | 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 | 118 | int down, up; |
84d5e5e0 | 119 | struct orig_node *orig_node; |
c6c8fea2 | 120 | |
c4aac1ab | 121 | rcu_read_lock(); |
c6c8fea2 | 122 | hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) { |
e1a5382f | 123 | if (gw_node->deleted) |
c6c8fea2 SE |
124 | continue; |
125 | ||
84d5e5e0 | 126 | orig_node = gw_node->orig_node; |
7d211efc | 127 | router = batadv_orig_node_get_router(orig_node); |
e1a5382f | 128 | if (!router) |
c6c8fea2 SE |
129 | continue; |
130 | ||
2265c141 AQ |
131 | if (!atomic_inc_not_zero(&gw_node->refcount)) |
132 | goto next; | |
133 | ||
c6c8fea2 SE |
134 | switch (atomic_read(&bat_priv->gw_sel_class)) { |
135 | case 1: /* fast connection */ | |
84d5e5e0 SE |
136 | batadv_gw_bandwidth_to_kbit(orig_node->gw_flags, |
137 | &down, &up); | |
c6c8fea2 | 138 | |
e1a5382f | 139 | tmp_gw_factor = (router->tq_avg * router->tq_avg * |
c6c8fea2 SE |
140 | down * 100 * 100) / |
141 | (TQ_LOCAL_WINDOW_SIZE * | |
142 | TQ_LOCAL_WINDOW_SIZE * 64); | |
143 | ||
144 | if ((tmp_gw_factor > max_gw_factor) || | |
145 | ((tmp_gw_factor == max_gw_factor) && | |
2265c141 AQ |
146 | (router->tq_avg > max_tq))) { |
147 | if (curr_gw) | |
148 | gw_node_free_ref(curr_gw); | |
149 | curr_gw = gw_node; | |
150 | atomic_inc(&curr_gw->refcount); | |
151 | } | |
c6c8fea2 SE |
152 | break; |
153 | ||
154 | default: /** | |
155 | * 2: stable connection (use best statistic) | |
156 | * 3: fast-switch (use best statistic but change as | |
157 | * soon as a better gateway appears) | |
158 | * XX: late-switch (use best statistic but change as | |
159 | * soon as a better gateway appears which has | |
160 | * $routing_class more tq points) | |
161 | **/ | |
2265c141 AQ |
162 | if (router->tq_avg > max_tq) { |
163 | if (curr_gw) | |
164 | gw_node_free_ref(curr_gw); | |
165 | curr_gw = gw_node; | |
166 | atomic_inc(&curr_gw->refcount); | |
167 | } | |
c6c8fea2 SE |
168 | break; |
169 | } | |
170 | ||
e1a5382f LL |
171 | if (router->tq_avg > max_tq) |
172 | max_tq = router->tq_avg; | |
c6c8fea2 SE |
173 | |
174 | if (tmp_gw_factor > max_gw_factor) | |
175 | max_gw_factor = tmp_gw_factor; | |
e1a5382f | 176 | |
2265c141 AQ |
177 | gw_node_free_ref(gw_node); |
178 | ||
179 | next: | |
7d211efc | 180 | batadv_neigh_node_free_ref(router); |
c6c8fea2 | 181 | } |
2265c141 | 182 | rcu_read_unlock(); |
c6c8fea2 | 183 | |
2265c141 AQ |
184 | return curr_gw; |
185 | } | |
c6c8fea2 | 186 | |
7cf06bc6 | 187 | void batadv_gw_election(struct bat_priv *bat_priv) |
2265c141 AQ |
188 | { |
189 | struct gw_node *curr_gw = NULL, *next_gw = NULL; | |
190 | struct neigh_node *router = NULL; | |
19595e05 | 191 | char gw_addr[18] = { '\0' }; |
2265c141 AQ |
192 | |
193 | /** | |
194 | * The batman daemon checks here if we already passed a full originator | |
195 | * cycle in order to make sure we don't choose the first gateway we | |
196 | * hear about. This check is based on the daemon's uptime which we | |
197 | * don't have. | |
198 | **/ | |
199 | if (atomic_read(&bat_priv->gw_mode) != GW_MODE_CLIENT) | |
200 | goto out; | |
201 | ||
202 | if (!atomic_dec_not_zero(&bat_priv->gw_reselect)) | |
203 | goto out; | |
204 | ||
205 | curr_gw = gw_get_selected_gw_node(bat_priv); | |
206 | ||
207 | next_gw = gw_get_best_gw_node(bat_priv); | |
208 | ||
209 | if (curr_gw == next_gw) | |
210 | goto out; | |
211 | ||
212 | if (next_gw) { | |
19595e05 AQ |
213 | sprintf(gw_addr, "%pM", next_gw->orig_node->orig); |
214 | ||
7d211efc | 215 | router = batadv_orig_node_get_router(next_gw->orig_node); |
2265c141 | 216 | if (!router) { |
7cf06bc6 | 217 | batadv_gw_deselect(bat_priv); |
2265c141 AQ |
218 | goto out; |
219 | } | |
c6c8fea2 SE |
220 | } |
221 | ||
2265c141 AQ |
222 | if ((curr_gw) && (!next_gw)) { |
223 | bat_dbg(DBG_BATMAN, bat_priv, | |
224 | "Removing selected gateway - no gateway in range\n"); | |
5853e22c | 225 | batadv_throw_uevent(bat_priv, UEV_GW, UEV_DEL, NULL); |
2265c141 AQ |
226 | } else if ((!curr_gw) && (next_gw)) { |
227 | bat_dbg(DBG_BATMAN, bat_priv, | |
228 | "Adding route to gateway %pM (gw_flags: %i, tq: %i)\n", | |
86ceb360 | 229 | next_gw->orig_node->orig, next_gw->orig_node->gw_flags, |
2265c141 | 230 | router->tq_avg); |
5853e22c | 231 | batadv_throw_uevent(bat_priv, UEV_GW, UEV_ADD, gw_addr); |
2265c141 AQ |
232 | } else { |
233 | bat_dbg(DBG_BATMAN, bat_priv, | |
86ceb360 SE |
234 | "Changing route to gateway %pM (gw_flags: %i, tq: %i)\n", |
235 | next_gw->orig_node->orig, next_gw->orig_node->gw_flags, | |
2265c141 | 236 | router->tq_avg); |
5853e22c | 237 | batadv_throw_uevent(bat_priv, UEV_GW, UEV_CHANGE, gw_addr); |
2265c141 AQ |
238 | } |
239 | ||
240 | gw_select(bat_priv, next_gw); | |
241 | ||
c4aac1ab ML |
242 | out: |
243 | if (curr_gw) | |
244 | gw_node_free_ref(curr_gw); | |
2265c141 AQ |
245 | if (next_gw) |
246 | gw_node_free_ref(next_gw); | |
247 | if (router) | |
7d211efc | 248 | batadv_neigh_node_free_ref(router); |
c6c8fea2 SE |
249 | } |
250 | ||
7cf06bc6 SE |
251 | void batadv_gw_check_election(struct bat_priv *bat_priv, |
252 | struct orig_node *orig_node) | |
c6c8fea2 | 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 | ||
7cf06bc6 | 258 | curr_gw_orig = batadv_gw_get_selected_orig(bat_priv); |
57f0c07c LL |
259 | if (!curr_gw_orig) |
260 | goto deselect; | |
c6c8fea2 | 261 | |
7d211efc | 262 | router_gw = batadv_orig_node_get_router(curr_gw_orig); |
e1a5382f LL |
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 | |
7d211efc | 270 | router_orig = batadv_orig_node_get_router(orig_node); |
e1a5382f LL |
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, | |
86ceb360 | 290 | "Restarting gateway selection: better gateway found (tq curr: %i, tq new: %i)\n", |
c6c8fea2 SE |
291 | gw_tq_avg, orig_tq_avg); |
292 | ||
293 | deselect: | |
7cf06bc6 | 294 | batadv_gw_deselect(bat_priv); |
5d02b3cd | 295 | out: |
57f0c07c | 296 | if (curr_gw_orig) |
7d211efc | 297 | batadv_orig_node_free_ref(curr_gw_orig); |
e1a5382f | 298 | if (router_gw) |
7d211efc | 299 | batadv_neigh_node_free_ref(router_gw); |
e1a5382f | 300 | if (router_orig) |
7d211efc | 301 | batadv_neigh_node_free_ref(router_orig); |
57f0c07c | 302 | |
5d02b3cd | 303 | return; |
c6c8fea2 SE |
304 | } |
305 | ||
306 | static void gw_node_add(struct bat_priv *bat_priv, | |
307 | struct orig_node *orig_node, uint8_t new_gwflags) | |
308 | { | |
309 | struct gw_node *gw_node; | |
310 | int down, up; | |
311 | ||
704509b8 | 312 | gw_node = kzalloc(sizeof(*gw_node), GFP_ATOMIC); |
c6c8fea2 SE |
313 | if (!gw_node) |
314 | return; | |
315 | ||
c6c8fea2 SE |
316 | INIT_HLIST_NODE(&gw_node->list); |
317 | gw_node->orig_node = orig_node; | |
25b6d3c1 | 318 | atomic_set(&gw_node->refcount, 1); |
c6c8fea2 SE |
319 | |
320 | spin_lock_bh(&bat_priv->gw_list_lock); | |
321 | hlist_add_head_rcu(&gw_node->list, &bat_priv->gw_list); | |
322 | spin_unlock_bh(&bat_priv->gw_list_lock); | |
323 | ||
84d5e5e0 | 324 | batadv_gw_bandwidth_to_kbit(new_gwflags, &down, &up); |
c6c8fea2 SE |
325 | bat_dbg(DBG_BATMAN, bat_priv, |
326 | "Found new gateway %pM -> gw_class: %i - %i%s/%i%s\n", | |
327 | orig_node->orig, new_gwflags, | |
328 | (down > 2048 ? down / 1024 : down), | |
329 | (down > 2048 ? "MBit" : "KBit"), | |
330 | (up > 2048 ? up / 1024 : up), | |
331 | (up > 2048 ? "MBit" : "KBit")); | |
332 | } | |
333 | ||
7cf06bc6 SE |
334 | void batadv_gw_node_update(struct bat_priv *bat_priv, |
335 | struct orig_node *orig_node, uint8_t new_gwflags) | |
c6c8fea2 SE |
336 | { |
337 | struct hlist_node *node; | |
c4aac1ab ML |
338 | struct gw_node *gw_node, *curr_gw; |
339 | ||
71e4aa9c AQ |
340 | /** |
341 | * Note: We don't need a NULL check here, since curr_gw never gets | |
342 | * dereferenced. If curr_gw is NULL we also should not exit as we may | |
343 | * have this gateway in our list (duplication check!) even though we | |
344 | * have no currently selected gateway. | |
345 | */ | |
c4aac1ab | 346 | curr_gw = gw_get_selected_gw_node(bat_priv); |
c6c8fea2 SE |
347 | |
348 | rcu_read_lock(); | |
349 | hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) { | |
350 | if (gw_node->orig_node != orig_node) | |
351 | continue; | |
352 | ||
353 | bat_dbg(DBG_BATMAN, bat_priv, | |
86ceb360 | 354 | "Gateway class of originator %pM changed from %i to %i\n", |
c6c8fea2 SE |
355 | orig_node->orig, gw_node->orig_node->gw_flags, |
356 | new_gwflags); | |
357 | ||
358 | gw_node->deleted = 0; | |
359 | ||
ecbd5321 | 360 | if (new_gwflags == NO_FLAGS) { |
c6c8fea2 SE |
361 | gw_node->deleted = jiffies; |
362 | bat_dbg(DBG_BATMAN, bat_priv, | |
363 | "Gateway %pM removed from gateway list\n", | |
364 | orig_node->orig); | |
365 | ||
c4aac1ab ML |
366 | if (gw_node == curr_gw) |
367 | goto deselect; | |
c6c8fea2 SE |
368 | } |
369 | ||
c4aac1ab | 370 | goto unlock; |
c6c8fea2 | 371 | } |
c6c8fea2 | 372 | |
ecbd5321 | 373 | if (new_gwflags == NO_FLAGS) |
c4aac1ab | 374 | goto unlock; |
c6c8fea2 SE |
375 | |
376 | gw_node_add(bat_priv, orig_node, new_gwflags); | |
c4aac1ab ML |
377 | goto unlock; |
378 | ||
379 | deselect: | |
7cf06bc6 | 380 | batadv_gw_deselect(bat_priv); |
c4aac1ab ML |
381 | unlock: |
382 | rcu_read_unlock(); | |
71e4aa9c | 383 | |
c4aac1ab ML |
384 | if (curr_gw) |
385 | gw_node_free_ref(curr_gw); | |
c6c8fea2 SE |
386 | } |
387 | ||
7cf06bc6 SE |
388 | void batadv_gw_node_delete(struct bat_priv *bat_priv, |
389 | struct orig_node *orig_node) | |
c6c8fea2 | 390 | { |
7cf06bc6 | 391 | batadv_gw_node_update(bat_priv, orig_node, 0); |
c6c8fea2 SE |
392 | } |
393 | ||
7cf06bc6 | 394 | void batadv_gw_node_purge(struct bat_priv *bat_priv) |
c6c8fea2 | 395 | { |
c4aac1ab | 396 | struct gw_node *gw_node, *curr_gw; |
c6c8fea2 | 397 | struct hlist_node *node, *node_tmp; |
032b7969 | 398 | unsigned long timeout = msecs_to_jiffies(2 * PURGE_TIMEOUT); |
b4e17054 | 399 | int do_deselect = 0; |
c4aac1ab ML |
400 | |
401 | curr_gw = gw_get_selected_gw_node(bat_priv); | |
c6c8fea2 SE |
402 | |
403 | spin_lock_bh(&bat_priv->gw_list_lock); | |
404 | ||
405 | hlist_for_each_entry_safe(gw_node, node, node_tmp, | |
406 | &bat_priv->gw_list, list) { | |
407 | if (((!gw_node->deleted) || | |
408 | (time_before(jiffies, gw_node->deleted + timeout))) && | |
409 | atomic_read(&bat_priv->mesh_state) == MESH_ACTIVE) | |
410 | continue; | |
411 | ||
c4aac1ab ML |
412 | if (curr_gw == gw_node) |
413 | do_deselect = 1; | |
c6c8fea2 SE |
414 | |
415 | hlist_del_rcu(&gw_node->list); | |
25b6d3c1 | 416 | gw_node_free_ref(gw_node); |
c6c8fea2 SE |
417 | } |
418 | ||
c6c8fea2 | 419 | spin_unlock_bh(&bat_priv->gw_list_lock); |
c4aac1ab ML |
420 | |
421 | /* gw_deselect() needs to acquire the gw_list_lock */ | |
422 | if (do_deselect) | |
7cf06bc6 | 423 | batadv_gw_deselect(bat_priv); |
c4aac1ab ML |
424 | |
425 | if (curr_gw) | |
426 | gw_node_free_ref(curr_gw); | |
c6c8fea2 SE |
427 | } |
428 | ||
e1a5382f LL |
429 | /** |
430 | * fails if orig_node has no router | |
431 | */ | |
747e4221 SE |
432 | static int _write_buffer_text(struct bat_priv *bat_priv, struct seq_file *seq, |
433 | const struct gw_node *gw_node) | |
c6c8fea2 | 434 | { |
5d02b3cd | 435 | struct gw_node *curr_gw; |
e1a5382f LL |
436 | struct neigh_node *router; |
437 | int down, up, ret = -1; | |
c6c8fea2 | 438 | |
84d5e5e0 | 439 | batadv_gw_bandwidth_to_kbit(gw_node->orig_node->gw_flags, &down, &up); |
c6c8fea2 | 440 | |
7d211efc | 441 | router = batadv_orig_node_get_router(gw_node->orig_node); |
e1a5382f LL |
442 | if (!router) |
443 | goto out; | |
5d02b3cd | 444 | |
c4aac1ab | 445 | curr_gw = gw_get_selected_gw_node(bat_priv); |
5d02b3cd | 446 | |
5d02b3cd | 447 | ret = seq_printf(seq, "%s %pM (%3i) %pM [%10s]: %3i - %i%s/%i%s\n", |
c4aac1ab ML |
448 | (curr_gw == gw_node ? "=>" : " "), |
449 | gw_node->orig_node->orig, | |
450 | router->tq_avg, router->addr, | |
451 | router->if_incoming->net_dev->name, | |
452 | gw_node->orig_node->gw_flags, | |
453 | (down > 2048 ? down / 1024 : down), | |
454 | (down > 2048 ? "MBit" : "KBit"), | |
455 | (up > 2048 ? up / 1024 : up), | |
456 | (up > 2048 ? "MBit" : "KBit")); | |
5d02b3cd | 457 | |
7d211efc | 458 | batadv_neigh_node_free_ref(router); |
c4aac1ab ML |
459 | if (curr_gw) |
460 | gw_node_free_ref(curr_gw); | |
e1a5382f | 461 | out: |
5d02b3cd | 462 | return ret; |
c6c8fea2 SE |
463 | } |
464 | ||
7cf06bc6 | 465 | int batadv_gw_client_seq_print_text(struct seq_file *seq, void *offset) |
c6c8fea2 SE |
466 | { |
467 | struct net_device *net_dev = (struct net_device *)seq->private; | |
468 | struct bat_priv *bat_priv = netdev_priv(net_dev); | |
32ae9b22 | 469 | struct hard_iface *primary_if; |
c6c8fea2 SE |
470 | struct gw_node *gw_node; |
471 | struct hlist_node *node; | |
32ae9b22 | 472 | int gw_count = 0, ret = 0; |
c6c8fea2 | 473 | |
32ae9b22 ML |
474 | primary_if = primary_if_get_selected(bat_priv); |
475 | if (!primary_if) { | |
86ceb360 SE |
476 | ret = seq_printf(seq, |
477 | "BATMAN mesh %s disabled - please specify interfaces to enable it\n", | |
32ae9b22 ML |
478 | net_dev->name); |
479 | goto out; | |
c6c8fea2 SE |
480 | } |
481 | ||
32ae9b22 | 482 | if (primary_if->if_status != IF_ACTIVE) { |
86ceb360 SE |
483 | ret = seq_printf(seq, |
484 | "BATMAN mesh %s disabled - primary interface not active\n", | |
32ae9b22 ML |
485 | net_dev->name); |
486 | goto out; | |
c6c8fea2 SE |
487 | } |
488 | ||
86ceb360 SE |
489 | seq_printf(seq, |
490 | " %-12s (%s/%i) %17s [%10s]: gw_class ... [B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s)]\n", | |
491 | "Gateway", "#", TQ_MAX_VALUE, "Nexthop", "outgoingIF", | |
492 | SOURCE_VERSION, primary_if->net_dev->name, | |
32ae9b22 | 493 | primary_if->net_dev->dev_addr, net_dev->name); |
c6c8fea2 SE |
494 | |
495 | rcu_read_lock(); | |
496 | hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) { | |
497 | if (gw_node->deleted) | |
498 | continue; | |
499 | ||
e1a5382f LL |
500 | /* fails if orig_node has no router */ |
501 | if (_write_buffer_text(bat_priv, seq, gw_node) < 0) | |
c6c8fea2 SE |
502 | continue; |
503 | ||
c6c8fea2 SE |
504 | gw_count++; |
505 | } | |
506 | rcu_read_unlock(); | |
507 | ||
508 | if (gw_count == 0) | |
509 | seq_printf(seq, "No gateways in range ...\n"); | |
510 | ||
32ae9b22 ML |
511 | out: |
512 | if (primary_if) | |
513 | hardif_free_ref(primary_if); | |
514 | return ret; | |
c6c8fea2 SE |
515 | } |
516 | ||
43676ab5 AQ |
517 | static bool is_type_dhcprequest(struct sk_buff *skb, int header_len) |
518 | { | |
519 | int ret = false; | |
520 | unsigned char *p; | |
521 | int pkt_len; | |
522 | ||
523 | if (skb_linearize(skb) < 0) | |
524 | goto out; | |
525 | ||
526 | pkt_len = skb_headlen(skb); | |
527 | ||
528 | if (pkt_len < header_len + DHCP_OPTIONS_OFFSET + 1) | |
529 | goto out; | |
530 | ||
531 | p = skb->data + header_len + DHCP_OPTIONS_OFFSET; | |
532 | pkt_len -= header_len + DHCP_OPTIONS_OFFSET + 1; | |
533 | ||
534 | /* Access the dhcp option lists. Each entry is made up by: | |
015758d0 AQ |
535 | * - octet 1: option type |
536 | * - octet 2: option data len (only if type != 255 and 0) | |
537 | * - octet 3: option data */ | |
43676ab5 | 538 | while (*p != 255 && !ret) { |
015758d0 | 539 | /* p now points to the first octet: option type */ |
43676ab5 AQ |
540 | if (*p == 53) { |
541 | /* type 53 is the message type option. | |
015758d0 | 542 | * Jump the len octet and go to the data octet */ |
43676ab5 AQ |
543 | if (pkt_len < 2) |
544 | goto out; | |
545 | p += 2; | |
546 | ||
547 | /* check if the message type is what we need */ | |
548 | if (*p == DHCP_REQUEST) | |
549 | ret = true; | |
550 | break; | |
551 | } else if (*p == 0) { | |
552 | /* option type 0 (padding), just go forward */ | |
553 | if (pkt_len < 1) | |
554 | goto out; | |
555 | pkt_len--; | |
556 | p++; | |
557 | } else { | |
558 | /* This is any other option. So we get the length... */ | |
559 | if (pkt_len < 1) | |
560 | goto out; | |
561 | pkt_len--; | |
562 | p++; | |
563 | ||
564 | /* ...and then we jump over the data */ | |
9205cc52 | 565 | if (pkt_len < 1 + (*p)) |
43676ab5 | 566 | goto out; |
9205cc52 AQ |
567 | pkt_len -= 1 + (*p); |
568 | p += 1 + (*p); | |
43676ab5 AQ |
569 | } |
570 | } | |
571 | out: | |
572 | return ret; | |
573 | } | |
574 | ||
7cf06bc6 | 575 | bool batadv_gw_is_dhcp_target(struct sk_buff *skb, unsigned int *header_len) |
c6c8fea2 SE |
576 | { |
577 | struct ethhdr *ethhdr; | |
578 | struct iphdr *iphdr; | |
579 | struct ipv6hdr *ipv6hdr; | |
580 | struct udphdr *udphdr; | |
c6c8fea2 SE |
581 | |
582 | /* check for ethernet header */ | |
be7af5cf ML |
583 | if (!pskb_may_pull(skb, *header_len + ETH_HLEN)) |
584 | return false; | |
c6c8fea2 | 585 | ethhdr = (struct ethhdr *)skb->data; |
be7af5cf | 586 | *header_len += ETH_HLEN; |
c6c8fea2 SE |
587 | |
588 | /* check for initial vlan header */ | |
589 | if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) { | |
be7af5cf ML |
590 | if (!pskb_may_pull(skb, *header_len + VLAN_HLEN)) |
591 | return false; | |
c6c8fea2 | 592 | ethhdr = (struct ethhdr *)(skb->data + VLAN_HLEN); |
be7af5cf | 593 | *header_len += VLAN_HLEN; |
c6c8fea2 SE |
594 | } |
595 | ||
596 | /* check for ip header */ | |
597 | switch (ntohs(ethhdr->h_proto)) { | |
598 | case ETH_P_IP: | |
be7af5cf ML |
599 | if (!pskb_may_pull(skb, *header_len + sizeof(*iphdr))) |
600 | return false; | |
601 | iphdr = (struct iphdr *)(skb->data + *header_len); | |
602 | *header_len += iphdr->ihl * 4; | |
c6c8fea2 SE |
603 | |
604 | /* check for udp header */ | |
605 | if (iphdr->protocol != IPPROTO_UDP) | |
be7af5cf | 606 | return false; |
c6c8fea2 SE |
607 | |
608 | break; | |
609 | case ETH_P_IPV6: | |
be7af5cf ML |
610 | if (!pskb_may_pull(skb, *header_len + sizeof(*ipv6hdr))) |
611 | return false; | |
612 | ipv6hdr = (struct ipv6hdr *)(skb->data + *header_len); | |
613 | *header_len += sizeof(*ipv6hdr); | |
c6c8fea2 SE |
614 | |
615 | /* check for udp header */ | |
616 | if (ipv6hdr->nexthdr != IPPROTO_UDP) | |
be7af5cf | 617 | return false; |
c6c8fea2 SE |
618 | |
619 | break; | |
620 | default: | |
be7af5cf | 621 | return false; |
c6c8fea2 SE |
622 | } |
623 | ||
be7af5cf ML |
624 | if (!pskb_may_pull(skb, *header_len + sizeof(*udphdr))) |
625 | return false; | |
626 | udphdr = (struct udphdr *)(skb->data + *header_len); | |
627 | *header_len += sizeof(*udphdr); | |
c6c8fea2 SE |
628 | |
629 | /* check for bootp port */ | |
630 | if ((ntohs(ethhdr->h_proto) == ETH_P_IP) && | |
7c64fd98 | 631 | (ntohs(udphdr->dest) != 67)) |
be7af5cf | 632 | return false; |
c6c8fea2 SE |
633 | |
634 | if ((ntohs(ethhdr->h_proto) == ETH_P_IPV6) && | |
635 | (ntohs(udphdr->dest) != 547)) | |
be7af5cf | 636 | return false; |
c6c8fea2 | 637 | |
be7af5cf ML |
638 | return true; |
639 | } | |
c6c8fea2 | 640 | |
7cf06bc6 SE |
641 | bool batadv_gw_out_of_range(struct bat_priv *bat_priv, |
642 | struct sk_buff *skb, struct ethhdr *ethhdr) | |
be7af5cf ML |
643 | { |
644 | struct neigh_node *neigh_curr = NULL, *neigh_old = NULL; | |
645 | struct orig_node *orig_dst_node = NULL; | |
646 | struct gw_node *curr_gw = NULL; | |
647 | bool ret, out_of_range = false; | |
648 | unsigned int header_len = 0; | |
649 | uint8_t curr_tq_avg; | |
650 | ||
7cf06bc6 | 651 | ret = batadv_gw_is_dhcp_target(skb, &header_len); |
be7af5cf ML |
652 | if (!ret) |
653 | goto out; | |
654 | ||
655 | orig_dst_node = transtable_search(bat_priv, ethhdr->h_source, | |
656 | ethhdr->h_dest); | |
657 | if (!orig_dst_node) | |
658 | goto out; | |
659 | ||
660 | if (!orig_dst_node->gw_flags) | |
661 | goto out; | |
662 | ||
663 | ret = is_type_dhcprequest(skb, header_len); | |
664 | if (!ret) | |
665 | goto out; | |
666 | ||
667 | switch (atomic_read(&bat_priv->gw_mode)) { | |
668 | case GW_MODE_SERVER: | |
669 | /* If we are a GW then we are our best GW. We can artificially | |
670 | * set the tq towards ourself as the maximum value */ | |
671 | curr_tq_avg = TQ_MAX_VALUE; | |
672 | break; | |
673 | case GW_MODE_CLIENT: | |
674 | curr_gw = gw_get_selected_gw_node(bat_priv); | |
675 | if (!curr_gw) | |
676 | goto out; | |
677 | ||
678 | /* packet is going to our gateway */ | |
679 | if (curr_gw->orig_node == orig_dst_node) | |
680 | goto out; | |
681 | ||
682 | /* If the dhcp packet has been sent to a different gw, | |
683 | * we have to evaluate whether the old gw is still | |
684 | * reliable enough */ | |
685 | neigh_curr = find_router(bat_priv, curr_gw->orig_node, NULL); | |
686 | if (!neigh_curr) | |
687 | goto out; | |
688 | ||
689 | curr_tq_avg = neigh_curr->tq_avg; | |
690 | break; | |
691 | case GW_MODE_OFF: | |
692 | default: | |
693 | goto out; | |
43676ab5 | 694 | } |
be7af5cf ML |
695 | |
696 | neigh_old = find_router(bat_priv, orig_dst_node, NULL); | |
2ef04f47 | 697 | if (!neigh_old) |
be7af5cf ML |
698 | goto out; |
699 | ||
700 | if (curr_tq_avg - neigh_old->tq_avg > GW_THRESHOLD) | |
701 | out_of_range = true; | |
702 | ||
703 | out: | |
704 | if (orig_dst_node) | |
7d211efc | 705 | batadv_orig_node_free_ref(orig_dst_node); |
be7af5cf ML |
706 | if (curr_gw) |
707 | gw_node_free_ref(curr_gw); | |
43676ab5 | 708 | if (neigh_old) |
7d211efc | 709 | batadv_neigh_node_free_ref(neigh_old); |
43676ab5 | 710 | if (neigh_curr) |
7d211efc | 711 | batadv_neigh_node_free_ref(neigh_curr); |
be7af5cf | 712 | return out_of_range; |
c6c8fea2 | 713 | } |