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9cfc7bd6 | 1 | /* Copyright (C) 2009-2012 B.A.T.M.A.N. contributors: |
c6c8fea2 SE |
2 | * |
3 | * Marek Lindner | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of version 2 of the GNU General Public | |
7 | * License as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but | |
10 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | * General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
17 | * 02110-1301, USA | |
c6c8fea2 SE |
18 | */ |
19 | ||
20 | #include "main.h" | |
2265c141 | 21 | #include "bat_sysfs.h" |
c6c8fea2 SE |
22 | #include "gateway_client.h" |
23 | #include "gateway_common.h" | |
24 | #include "hard-interface.h" | |
57f0c07c | 25 | #include "originator.h" |
be7af5cf | 26 | #include "translation-table.h" |
43676ab5 | 27 | #include "routing.h" |
c6c8fea2 SE |
28 | #include <linux/ip.h> |
29 | #include <linux/ipv6.h> | |
30 | #include <linux/udp.h> | |
31 | #include <linux/if_vlan.h> | |
32 | ||
43676ab5 | 33 | /* This is the offset of the options field in a dhcp packet starting at |
9cfc7bd6 SE |
34 | * the beginning of the dhcp header |
35 | */ | |
43676ab5 AQ |
36 | #define DHCP_OPTIONS_OFFSET 240 |
37 | #define DHCP_REQUEST 3 | |
38 | ||
25b6d3c1 | 39 | static void gw_node_free_ref(struct gw_node *gw_node) |
c6c8fea2 | 40 | { |
25b6d3c1 | 41 | if (atomic_dec_and_test(&gw_node->refcount)) |
eb340b2f | 42 | kfree_rcu(gw_node, rcu); |
c6c8fea2 SE |
43 | } |
44 | ||
c4aac1ab | 45 | static struct gw_node *gw_get_selected_gw_node(struct bat_priv *bat_priv) |
c6c8fea2 | 46 | { |
c4aac1ab | 47 | struct gw_node *gw_node; |
c6c8fea2 | 48 | |
5d02b3cd | 49 | rcu_read_lock(); |
c4aac1ab ML |
50 | gw_node = rcu_dereference(bat_priv->curr_gw); |
51 | if (!gw_node) | |
7b36e8ee | 52 | goto out; |
c6c8fea2 | 53 | |
c4aac1ab ML |
54 | if (!atomic_inc_not_zero(&gw_node->refcount)) |
55 | gw_node = NULL; | |
43c70ad5 | 56 | |
5d02b3cd LL |
57 | out: |
58 | rcu_read_unlock(); | |
c4aac1ab | 59 | return gw_node; |
c6c8fea2 SE |
60 | } |
61 | ||
7cf06bc6 | 62 | struct orig_node *batadv_gw_get_selected_orig(struct bat_priv *bat_priv) |
c6c8fea2 | 63 | { |
5d02b3cd | 64 | struct gw_node *gw_node; |
c4aac1ab | 65 | struct orig_node *orig_node = NULL; |
c6c8fea2 | 66 | |
c4aac1ab ML |
67 | gw_node = gw_get_selected_gw_node(bat_priv); |
68 | if (!gw_node) | |
69 | goto out; | |
70 | ||
71 | rcu_read_lock(); | |
72 | orig_node = gw_node->orig_node; | |
73 | if (!orig_node) | |
74 | goto unlock; | |
75 | ||
76 | if (!atomic_inc_not_zero(&orig_node->refcount)) | |
77 | orig_node = NULL; | |
c6c8fea2 | 78 | |
c4aac1ab ML |
79 | unlock: |
80 | rcu_read_unlock(); | |
81 | out: | |
c6c8fea2 | 82 | if (gw_node) |
25b6d3c1 | 83 | gw_node_free_ref(gw_node); |
c4aac1ab | 84 | return orig_node; |
c6c8fea2 SE |
85 | } |
86 | ||
25b6d3c1 | 87 | static void gw_select(struct bat_priv *bat_priv, struct gw_node *new_gw_node) |
c6c8fea2 | 88 | { |
5d02b3cd | 89 | struct gw_node *curr_gw_node; |
c6c8fea2 | 90 | |
c4aac1ab ML |
91 | spin_lock_bh(&bat_priv->gw_list_lock); |
92 | ||
25b6d3c1 ML |
93 | if (new_gw_node && !atomic_inc_not_zero(&new_gw_node->refcount)) |
94 | new_gw_node = NULL; | |
c6c8fea2 | 95 | |
728cbc6a | 96 | curr_gw_node = rcu_dereference_protected(bat_priv->curr_gw, 1); |
5d02b3cd | 97 | rcu_assign_pointer(bat_priv->curr_gw, new_gw_node); |
25b6d3c1 ML |
98 | |
99 | if (curr_gw_node) | |
100 | gw_node_free_ref(curr_gw_node); | |
c4aac1ab ML |
101 | |
102 | spin_unlock_bh(&bat_priv->gw_list_lock); | |
103 | } | |
104 | ||
7cf06bc6 | 105 | void batadv_gw_deselect(struct bat_priv *bat_priv) |
c4aac1ab | 106 | { |
2265c141 | 107 | atomic_set(&bat_priv->gw_reselect, 1); |
c6c8fea2 SE |
108 | } |
109 | ||
2265c141 | 110 | static struct gw_node *gw_get_best_gw_node(struct bat_priv *bat_priv) |
c6c8fea2 | 111 | { |
e1a5382f | 112 | struct neigh_node *router; |
2265c141 AQ |
113 | struct hlist_node *node; |
114 | struct gw_node *gw_node, *curr_gw = NULL; | |
c6c8fea2 | 115 | uint32_t max_gw_factor = 0, tmp_gw_factor = 0; |
2265c141 | 116 | uint8_t max_tq = 0; |
c6c8fea2 | 117 | int down, up; |
84d5e5e0 | 118 | struct orig_node *orig_node; |
c6c8fea2 | 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 | ||
84d5e5e0 | 125 | orig_node = gw_node->orig_node; |
7d211efc | 126 | router = batadv_orig_node_get_router(orig_node); |
e1a5382f | 127 | if (!router) |
c6c8fea2 SE |
128 | continue; |
129 | ||
2265c141 AQ |
130 | if (!atomic_inc_not_zero(&gw_node->refcount)) |
131 | goto next; | |
132 | ||
c6c8fea2 SE |
133 | switch (atomic_read(&bat_priv->gw_sel_class)) { |
134 | case 1: /* fast connection */ | |
84d5e5e0 SE |
135 | batadv_gw_bandwidth_to_kbit(orig_node->gw_flags, |
136 | &down, &up); | |
c6c8fea2 | 137 | |
e1a5382f | 138 | tmp_gw_factor = (router->tq_avg * router->tq_avg * |
c6c8fea2 SE |
139 | down * 100 * 100) / |
140 | (TQ_LOCAL_WINDOW_SIZE * | |
141 | TQ_LOCAL_WINDOW_SIZE * 64); | |
142 | ||
143 | if ((tmp_gw_factor > max_gw_factor) || | |
144 | ((tmp_gw_factor == max_gw_factor) && | |
2265c141 AQ |
145 | (router->tq_avg > max_tq))) { |
146 | if (curr_gw) | |
147 | gw_node_free_ref(curr_gw); | |
148 | curr_gw = gw_node; | |
149 | atomic_inc(&curr_gw->refcount); | |
150 | } | |
c6c8fea2 SE |
151 | break; |
152 | ||
9cfc7bd6 | 153 | default: /* 2: stable connection (use best statistic) |
c6c8fea2 SE |
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) | |
9cfc7bd6 | 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: | |
7d211efc | 178 | batadv_neigh_node_free_ref(router); |
c6c8fea2 | 179 | } |
2265c141 | 180 | rcu_read_unlock(); |
c6c8fea2 | 181 | |
2265c141 AQ |
182 | return curr_gw; |
183 | } | |
c6c8fea2 | 184 | |
7cf06bc6 | 185 | void batadv_gw_election(struct bat_priv *bat_priv) |
2265c141 AQ |
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 | 190 | |
9cfc7bd6 | 191 | /* The batman daemon checks here if we already passed a full originator |
2265c141 AQ |
192 | * cycle in order to make sure we don't choose the first gateway we |
193 | * hear about. This check is based on the daemon's uptime which we | |
194 | * don't have. | |
9cfc7bd6 | 195 | */ |
2265c141 AQ |
196 | if (atomic_read(&bat_priv->gw_mode) != GW_MODE_CLIENT) |
197 | goto out; | |
198 | ||
199 | if (!atomic_dec_not_zero(&bat_priv->gw_reselect)) | |
200 | goto out; | |
201 | ||
202 | curr_gw = gw_get_selected_gw_node(bat_priv); | |
203 | ||
204 | next_gw = gw_get_best_gw_node(bat_priv); | |
205 | ||
206 | if (curr_gw == next_gw) | |
207 | goto out; | |
208 | ||
209 | if (next_gw) { | |
19595e05 AQ |
210 | sprintf(gw_addr, "%pM", next_gw->orig_node->orig); |
211 | ||
7d211efc | 212 | router = batadv_orig_node_get_router(next_gw->orig_node); |
2265c141 | 213 | if (!router) { |
7cf06bc6 | 214 | batadv_gw_deselect(bat_priv); |
2265c141 AQ |
215 | goto out; |
216 | } | |
c6c8fea2 SE |
217 | } |
218 | ||
2265c141 AQ |
219 | if ((curr_gw) && (!next_gw)) { |
220 | bat_dbg(DBG_BATMAN, bat_priv, | |
221 | "Removing selected gateway - no gateway in range\n"); | |
5853e22c | 222 | batadv_throw_uevent(bat_priv, UEV_GW, UEV_DEL, NULL); |
2265c141 AQ |
223 | } else if ((!curr_gw) && (next_gw)) { |
224 | bat_dbg(DBG_BATMAN, bat_priv, | |
225 | "Adding route to gateway %pM (gw_flags: %i, tq: %i)\n", | |
86ceb360 | 226 | next_gw->orig_node->orig, next_gw->orig_node->gw_flags, |
2265c141 | 227 | router->tq_avg); |
5853e22c | 228 | batadv_throw_uevent(bat_priv, UEV_GW, UEV_ADD, gw_addr); |
2265c141 AQ |
229 | } else { |
230 | bat_dbg(DBG_BATMAN, bat_priv, | |
86ceb360 SE |
231 | "Changing route to gateway %pM (gw_flags: %i, tq: %i)\n", |
232 | next_gw->orig_node->orig, next_gw->orig_node->gw_flags, | |
2265c141 | 233 | router->tq_avg); |
5853e22c | 234 | batadv_throw_uevent(bat_priv, UEV_GW, UEV_CHANGE, gw_addr); |
2265c141 AQ |
235 | } |
236 | ||
237 | gw_select(bat_priv, next_gw); | |
238 | ||
c4aac1ab ML |
239 | out: |
240 | if (curr_gw) | |
241 | gw_node_free_ref(curr_gw); | |
2265c141 AQ |
242 | if (next_gw) |
243 | gw_node_free_ref(next_gw); | |
244 | if (router) | |
7d211efc | 245 | batadv_neigh_node_free_ref(router); |
c6c8fea2 SE |
246 | } |
247 | ||
7cf06bc6 SE |
248 | void batadv_gw_check_election(struct bat_priv *bat_priv, |
249 | struct orig_node *orig_node) | |
c6c8fea2 | 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 | ||
7cf06bc6 | 255 | curr_gw_orig = batadv_gw_get_selected_orig(bat_priv); |
57f0c07c LL |
256 | if (!curr_gw_orig) |
257 | goto deselect; | |
c6c8fea2 | 258 | |
7d211efc | 259 | router_gw = batadv_orig_node_get_router(curr_gw_orig); |
e1a5382f LL |
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 | |
7d211efc | 267 | router_orig = batadv_orig_node_get_router(orig_node); |
e1a5382f LL |
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 | 277 | |
9cfc7bd6 | 278 | /* if the routing class is greater than 3 the value tells us how much |
c6c8fea2 | 279 | * greater the TQ value of the new gateway must be |
9cfc7bd6 | 280 | */ |
c6c8fea2 SE |
281 | if ((atomic_read(&bat_priv->gw_sel_class) > 3) && |
282 | (orig_tq_avg - gw_tq_avg < atomic_read(&bat_priv->gw_sel_class))) | |
5d02b3cd | 283 | goto out; |
c6c8fea2 SE |
284 | |
285 | bat_dbg(DBG_BATMAN, bat_priv, | |
86ceb360 | 286 | "Restarting gateway selection: better gateway found (tq curr: %i, tq new: %i)\n", |
c6c8fea2 SE |
287 | gw_tq_avg, orig_tq_avg); |
288 | ||
289 | deselect: | |
7cf06bc6 | 290 | batadv_gw_deselect(bat_priv); |
5d02b3cd | 291 | out: |
57f0c07c | 292 | if (curr_gw_orig) |
7d211efc | 293 | batadv_orig_node_free_ref(curr_gw_orig); |
e1a5382f | 294 | if (router_gw) |
7d211efc | 295 | batadv_neigh_node_free_ref(router_gw); |
e1a5382f | 296 | if (router_orig) |
7d211efc | 297 | batadv_neigh_node_free_ref(router_orig); |
57f0c07c | 298 | |
5d02b3cd | 299 | return; |
c6c8fea2 SE |
300 | } |
301 | ||
302 | static void gw_node_add(struct bat_priv *bat_priv, | |
303 | struct orig_node *orig_node, uint8_t new_gwflags) | |
304 | { | |
305 | struct gw_node *gw_node; | |
306 | int down, up; | |
307 | ||
704509b8 | 308 | gw_node = kzalloc(sizeof(*gw_node), GFP_ATOMIC); |
c6c8fea2 SE |
309 | if (!gw_node) |
310 | return; | |
311 | ||
c6c8fea2 SE |
312 | INIT_HLIST_NODE(&gw_node->list); |
313 | gw_node->orig_node = orig_node; | |
25b6d3c1 | 314 | atomic_set(&gw_node->refcount, 1); |
c6c8fea2 SE |
315 | |
316 | spin_lock_bh(&bat_priv->gw_list_lock); | |
317 | hlist_add_head_rcu(&gw_node->list, &bat_priv->gw_list); | |
318 | spin_unlock_bh(&bat_priv->gw_list_lock); | |
319 | ||
84d5e5e0 | 320 | batadv_gw_bandwidth_to_kbit(new_gwflags, &down, &up); |
c6c8fea2 SE |
321 | bat_dbg(DBG_BATMAN, bat_priv, |
322 | "Found new gateway %pM -> gw_class: %i - %i%s/%i%s\n", | |
323 | orig_node->orig, new_gwflags, | |
324 | (down > 2048 ? down / 1024 : down), | |
325 | (down > 2048 ? "MBit" : "KBit"), | |
326 | (up > 2048 ? up / 1024 : up), | |
327 | (up > 2048 ? "MBit" : "KBit")); | |
328 | } | |
329 | ||
7cf06bc6 SE |
330 | void batadv_gw_node_update(struct bat_priv *bat_priv, |
331 | struct orig_node *orig_node, uint8_t new_gwflags) | |
c6c8fea2 SE |
332 | { |
333 | struct hlist_node *node; | |
c4aac1ab ML |
334 | struct gw_node *gw_node, *curr_gw; |
335 | ||
9cfc7bd6 | 336 | /* Note: We don't need a NULL check here, since curr_gw never gets |
71e4aa9c AQ |
337 | * dereferenced. If curr_gw is NULL we also should not exit as we may |
338 | * have this gateway in our list (duplication check!) even though we | |
339 | * have no currently selected gateway. | |
340 | */ | |
c4aac1ab | 341 | curr_gw = gw_get_selected_gw_node(bat_priv); |
c6c8fea2 SE |
342 | |
343 | rcu_read_lock(); | |
344 | hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) { | |
345 | if (gw_node->orig_node != orig_node) | |
346 | continue; | |
347 | ||
348 | bat_dbg(DBG_BATMAN, bat_priv, | |
86ceb360 | 349 | "Gateway class of originator %pM changed from %i to %i\n", |
c6c8fea2 SE |
350 | orig_node->orig, gw_node->orig_node->gw_flags, |
351 | new_gwflags); | |
352 | ||
353 | gw_node->deleted = 0; | |
354 | ||
ecbd5321 | 355 | if (new_gwflags == NO_FLAGS) { |
c6c8fea2 SE |
356 | gw_node->deleted = jiffies; |
357 | bat_dbg(DBG_BATMAN, bat_priv, | |
358 | "Gateway %pM removed from gateway list\n", | |
359 | orig_node->orig); | |
360 | ||
c4aac1ab ML |
361 | if (gw_node == curr_gw) |
362 | goto deselect; | |
c6c8fea2 SE |
363 | } |
364 | ||
c4aac1ab | 365 | goto unlock; |
c6c8fea2 | 366 | } |
c6c8fea2 | 367 | |
ecbd5321 | 368 | if (new_gwflags == NO_FLAGS) |
c4aac1ab | 369 | goto unlock; |
c6c8fea2 SE |
370 | |
371 | gw_node_add(bat_priv, orig_node, new_gwflags); | |
c4aac1ab ML |
372 | goto unlock; |
373 | ||
374 | deselect: | |
7cf06bc6 | 375 | batadv_gw_deselect(bat_priv); |
c4aac1ab ML |
376 | unlock: |
377 | rcu_read_unlock(); | |
71e4aa9c | 378 | |
c4aac1ab ML |
379 | if (curr_gw) |
380 | gw_node_free_ref(curr_gw); | |
c6c8fea2 SE |
381 | } |
382 | ||
7cf06bc6 SE |
383 | void batadv_gw_node_delete(struct bat_priv *bat_priv, |
384 | struct orig_node *orig_node) | |
c6c8fea2 | 385 | { |
7cf06bc6 | 386 | batadv_gw_node_update(bat_priv, orig_node, 0); |
c6c8fea2 SE |
387 | } |
388 | ||
7cf06bc6 | 389 | void batadv_gw_node_purge(struct bat_priv *bat_priv) |
c6c8fea2 | 390 | { |
c4aac1ab | 391 | struct gw_node *gw_node, *curr_gw; |
c6c8fea2 | 392 | struct hlist_node *node, *node_tmp; |
032b7969 | 393 | unsigned long timeout = msecs_to_jiffies(2 * PURGE_TIMEOUT); |
b4e17054 | 394 | int do_deselect = 0; |
c4aac1ab ML |
395 | |
396 | curr_gw = gw_get_selected_gw_node(bat_priv); | |
c6c8fea2 SE |
397 | |
398 | spin_lock_bh(&bat_priv->gw_list_lock); | |
399 | ||
400 | hlist_for_each_entry_safe(gw_node, node, node_tmp, | |
401 | &bat_priv->gw_list, list) { | |
402 | if (((!gw_node->deleted) || | |
403 | (time_before(jiffies, gw_node->deleted + timeout))) && | |
404 | atomic_read(&bat_priv->mesh_state) == MESH_ACTIVE) | |
405 | continue; | |
406 | ||
c4aac1ab ML |
407 | if (curr_gw == gw_node) |
408 | do_deselect = 1; | |
c6c8fea2 SE |
409 | |
410 | hlist_del_rcu(&gw_node->list); | |
25b6d3c1 | 411 | gw_node_free_ref(gw_node); |
c6c8fea2 SE |
412 | } |
413 | ||
c6c8fea2 | 414 | spin_unlock_bh(&bat_priv->gw_list_lock); |
c4aac1ab ML |
415 | |
416 | /* gw_deselect() needs to acquire the gw_list_lock */ | |
417 | if (do_deselect) | |
7cf06bc6 | 418 | batadv_gw_deselect(bat_priv); |
c4aac1ab ML |
419 | |
420 | if (curr_gw) | |
421 | gw_node_free_ref(curr_gw); | |
c6c8fea2 SE |
422 | } |
423 | ||
9cfc7bd6 | 424 | /* fails if orig_node has no router */ |
747e4221 SE |
425 | static int _write_buffer_text(struct bat_priv *bat_priv, struct seq_file *seq, |
426 | const struct gw_node *gw_node) | |
c6c8fea2 | 427 | { |
5d02b3cd | 428 | struct gw_node *curr_gw; |
e1a5382f LL |
429 | struct neigh_node *router; |
430 | int down, up, ret = -1; | |
c6c8fea2 | 431 | |
84d5e5e0 | 432 | batadv_gw_bandwidth_to_kbit(gw_node->orig_node->gw_flags, &down, &up); |
c6c8fea2 | 433 | |
7d211efc | 434 | router = batadv_orig_node_get_router(gw_node->orig_node); |
e1a5382f LL |
435 | if (!router) |
436 | goto out; | |
5d02b3cd | 437 | |
c4aac1ab | 438 | curr_gw = gw_get_selected_gw_node(bat_priv); |
5d02b3cd | 439 | |
5d02b3cd | 440 | ret = seq_printf(seq, "%s %pM (%3i) %pM [%10s]: %3i - %i%s/%i%s\n", |
c4aac1ab ML |
441 | (curr_gw == gw_node ? "=>" : " "), |
442 | gw_node->orig_node->orig, | |
443 | router->tq_avg, router->addr, | |
444 | router->if_incoming->net_dev->name, | |
445 | gw_node->orig_node->gw_flags, | |
446 | (down > 2048 ? down / 1024 : down), | |
447 | (down > 2048 ? "MBit" : "KBit"), | |
448 | (up > 2048 ? up / 1024 : up), | |
449 | (up > 2048 ? "MBit" : "KBit")); | |
5d02b3cd | 450 | |
7d211efc | 451 | batadv_neigh_node_free_ref(router); |
c4aac1ab ML |
452 | if (curr_gw) |
453 | gw_node_free_ref(curr_gw); | |
e1a5382f | 454 | out: |
5d02b3cd | 455 | return ret; |
c6c8fea2 SE |
456 | } |
457 | ||
7cf06bc6 | 458 | int batadv_gw_client_seq_print_text(struct seq_file *seq, void *offset) |
c6c8fea2 SE |
459 | { |
460 | struct net_device *net_dev = (struct net_device *)seq->private; | |
461 | struct bat_priv *bat_priv = netdev_priv(net_dev); | |
32ae9b22 | 462 | struct hard_iface *primary_if; |
c6c8fea2 SE |
463 | struct gw_node *gw_node; |
464 | struct hlist_node *node; | |
32ae9b22 | 465 | int gw_count = 0, ret = 0; |
c6c8fea2 | 466 | |
32ae9b22 ML |
467 | primary_if = primary_if_get_selected(bat_priv); |
468 | if (!primary_if) { | |
86ceb360 SE |
469 | ret = seq_printf(seq, |
470 | "BATMAN mesh %s disabled - please specify interfaces to enable it\n", | |
32ae9b22 ML |
471 | net_dev->name); |
472 | goto out; | |
c6c8fea2 SE |
473 | } |
474 | ||
32ae9b22 | 475 | if (primary_if->if_status != IF_ACTIVE) { |
86ceb360 SE |
476 | ret = seq_printf(seq, |
477 | "BATMAN mesh %s disabled - primary interface not active\n", | |
32ae9b22 ML |
478 | net_dev->name); |
479 | goto out; | |
c6c8fea2 SE |
480 | } |
481 | ||
86ceb360 SE |
482 | seq_printf(seq, |
483 | " %-12s (%s/%i) %17s [%10s]: gw_class ... [B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s)]\n", | |
484 | "Gateway", "#", TQ_MAX_VALUE, "Nexthop", "outgoingIF", | |
485 | SOURCE_VERSION, primary_if->net_dev->name, | |
32ae9b22 | 486 | primary_if->net_dev->dev_addr, net_dev->name); |
c6c8fea2 SE |
487 | |
488 | rcu_read_lock(); | |
489 | hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) { | |
490 | if (gw_node->deleted) | |
491 | continue; | |
492 | ||
e1a5382f LL |
493 | /* fails if orig_node has no router */ |
494 | if (_write_buffer_text(bat_priv, seq, gw_node) < 0) | |
c6c8fea2 SE |
495 | continue; |
496 | ||
c6c8fea2 SE |
497 | gw_count++; |
498 | } | |
499 | rcu_read_unlock(); | |
500 | ||
501 | if (gw_count == 0) | |
502 | seq_printf(seq, "No gateways in range ...\n"); | |
503 | ||
32ae9b22 ML |
504 | out: |
505 | if (primary_if) | |
506 | hardif_free_ref(primary_if); | |
507 | return ret; | |
c6c8fea2 SE |
508 | } |
509 | ||
43676ab5 AQ |
510 | static bool is_type_dhcprequest(struct sk_buff *skb, int header_len) |
511 | { | |
512 | int ret = false; | |
513 | unsigned char *p; | |
514 | int pkt_len; | |
515 | ||
516 | if (skb_linearize(skb) < 0) | |
517 | goto out; | |
518 | ||
519 | pkt_len = skb_headlen(skb); | |
520 | ||
521 | if (pkt_len < header_len + DHCP_OPTIONS_OFFSET + 1) | |
522 | goto out; | |
523 | ||
524 | p = skb->data + header_len + DHCP_OPTIONS_OFFSET; | |
525 | pkt_len -= header_len + DHCP_OPTIONS_OFFSET + 1; | |
526 | ||
527 | /* Access the dhcp option lists. Each entry is made up by: | |
015758d0 AQ |
528 | * - octet 1: option type |
529 | * - octet 2: option data len (only if type != 255 and 0) | |
9cfc7bd6 SE |
530 | * - octet 3: option data |
531 | */ | |
43676ab5 | 532 | while (*p != 255 && !ret) { |
015758d0 | 533 | /* p now points to the first octet: option type */ |
43676ab5 AQ |
534 | if (*p == 53) { |
535 | /* type 53 is the message type option. | |
9cfc7bd6 SE |
536 | * Jump the len octet and go to the data octet |
537 | */ | |
43676ab5 AQ |
538 | if (pkt_len < 2) |
539 | goto out; | |
540 | p += 2; | |
541 | ||
542 | /* check if the message type is what we need */ | |
543 | if (*p == DHCP_REQUEST) | |
544 | ret = true; | |
545 | break; | |
546 | } else if (*p == 0) { | |
547 | /* option type 0 (padding), just go forward */ | |
548 | if (pkt_len < 1) | |
549 | goto out; | |
550 | pkt_len--; | |
551 | p++; | |
552 | } else { | |
553 | /* This is any other option. So we get the length... */ | |
554 | if (pkt_len < 1) | |
555 | goto out; | |
556 | pkt_len--; | |
557 | p++; | |
558 | ||
559 | /* ...and then we jump over the data */ | |
9205cc52 | 560 | if (pkt_len < 1 + (*p)) |
43676ab5 | 561 | goto out; |
9205cc52 AQ |
562 | pkt_len -= 1 + (*p); |
563 | p += 1 + (*p); | |
43676ab5 AQ |
564 | } |
565 | } | |
566 | out: | |
567 | return ret; | |
568 | } | |
569 | ||
7cf06bc6 | 570 | bool batadv_gw_is_dhcp_target(struct sk_buff *skb, unsigned int *header_len) |
c6c8fea2 SE |
571 | { |
572 | struct ethhdr *ethhdr; | |
573 | struct iphdr *iphdr; | |
574 | struct ipv6hdr *ipv6hdr; | |
575 | struct udphdr *udphdr; | |
c6c8fea2 SE |
576 | |
577 | /* check for ethernet header */ | |
be7af5cf ML |
578 | if (!pskb_may_pull(skb, *header_len + ETH_HLEN)) |
579 | return false; | |
c6c8fea2 | 580 | ethhdr = (struct ethhdr *)skb->data; |
be7af5cf | 581 | *header_len += ETH_HLEN; |
c6c8fea2 SE |
582 | |
583 | /* check for initial vlan header */ | |
584 | if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) { | |
be7af5cf ML |
585 | if (!pskb_may_pull(skb, *header_len + VLAN_HLEN)) |
586 | return false; | |
c6c8fea2 | 587 | ethhdr = (struct ethhdr *)(skb->data + VLAN_HLEN); |
be7af5cf | 588 | *header_len += VLAN_HLEN; |
c6c8fea2 SE |
589 | } |
590 | ||
591 | /* check for ip header */ | |
592 | switch (ntohs(ethhdr->h_proto)) { | |
593 | case ETH_P_IP: | |
be7af5cf ML |
594 | if (!pskb_may_pull(skb, *header_len + sizeof(*iphdr))) |
595 | return false; | |
596 | iphdr = (struct iphdr *)(skb->data + *header_len); | |
597 | *header_len += iphdr->ihl * 4; | |
c6c8fea2 SE |
598 | |
599 | /* check for udp header */ | |
600 | if (iphdr->protocol != IPPROTO_UDP) | |
be7af5cf | 601 | return false; |
c6c8fea2 SE |
602 | |
603 | break; | |
604 | case ETH_P_IPV6: | |
be7af5cf ML |
605 | if (!pskb_may_pull(skb, *header_len + sizeof(*ipv6hdr))) |
606 | return false; | |
607 | ipv6hdr = (struct ipv6hdr *)(skb->data + *header_len); | |
608 | *header_len += sizeof(*ipv6hdr); | |
c6c8fea2 SE |
609 | |
610 | /* check for udp header */ | |
611 | if (ipv6hdr->nexthdr != IPPROTO_UDP) | |
be7af5cf | 612 | return false; |
c6c8fea2 SE |
613 | |
614 | break; | |
615 | default: | |
be7af5cf | 616 | return false; |
c6c8fea2 SE |
617 | } |
618 | ||
be7af5cf ML |
619 | if (!pskb_may_pull(skb, *header_len + sizeof(*udphdr))) |
620 | return false; | |
621 | udphdr = (struct udphdr *)(skb->data + *header_len); | |
622 | *header_len += sizeof(*udphdr); | |
c6c8fea2 SE |
623 | |
624 | /* check for bootp port */ | |
625 | if ((ntohs(ethhdr->h_proto) == ETH_P_IP) && | |
7c64fd98 | 626 | (ntohs(udphdr->dest) != 67)) |
be7af5cf | 627 | return false; |
c6c8fea2 SE |
628 | |
629 | if ((ntohs(ethhdr->h_proto) == ETH_P_IPV6) && | |
630 | (ntohs(udphdr->dest) != 547)) | |
be7af5cf | 631 | return false; |
c6c8fea2 | 632 | |
be7af5cf ML |
633 | return true; |
634 | } | |
c6c8fea2 | 635 | |
7cf06bc6 SE |
636 | bool batadv_gw_out_of_range(struct bat_priv *bat_priv, |
637 | struct sk_buff *skb, struct ethhdr *ethhdr) | |
be7af5cf ML |
638 | { |
639 | struct neigh_node *neigh_curr = NULL, *neigh_old = NULL; | |
640 | struct orig_node *orig_dst_node = NULL; | |
641 | struct gw_node *curr_gw = NULL; | |
642 | bool ret, out_of_range = false; | |
643 | unsigned int header_len = 0; | |
644 | uint8_t curr_tq_avg; | |
645 | ||
7cf06bc6 | 646 | ret = batadv_gw_is_dhcp_target(skb, &header_len); |
be7af5cf ML |
647 | if (!ret) |
648 | goto out; | |
649 | ||
08c36d3e SE |
650 | orig_dst_node = batadv_transtable_search(bat_priv, ethhdr->h_source, |
651 | ethhdr->h_dest); | |
be7af5cf ML |
652 | if (!orig_dst_node) |
653 | goto out; | |
654 | ||
655 | if (!orig_dst_node->gw_flags) | |
656 | goto out; | |
657 | ||
658 | ret = is_type_dhcprequest(skb, header_len); | |
659 | if (!ret) | |
660 | goto out; | |
661 | ||
662 | switch (atomic_read(&bat_priv->gw_mode)) { | |
663 | case GW_MODE_SERVER: | |
664 | /* If we are a GW then we are our best GW. We can artificially | |
9cfc7bd6 SE |
665 | * set the tq towards ourself as the maximum value |
666 | */ | |
be7af5cf ML |
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 | |
9cfc7bd6 SE |
680 | * reliable enough |
681 | */ | |
30d3c511 SE |
682 | neigh_curr = batadv_find_router(bat_priv, curr_gw->orig_node, |
683 | NULL); | |
be7af5cf ML |
684 | if (!neigh_curr) |
685 | goto out; | |
686 | ||
687 | curr_tq_avg = neigh_curr->tq_avg; | |
688 | break; | |
689 | case GW_MODE_OFF: | |
690 | default: | |
691 | goto out; | |
43676ab5 | 692 | } |
be7af5cf | 693 | |
30d3c511 | 694 | neigh_old = batadv_find_router(bat_priv, orig_dst_node, NULL); |
2ef04f47 | 695 | if (!neigh_old) |
be7af5cf ML |
696 | goto out; |
697 | ||
698 | if (curr_tq_avg - neigh_old->tq_avg > GW_THRESHOLD) | |
699 | out_of_range = true; | |
700 | ||
701 | out: | |
702 | if (orig_dst_node) | |
7d211efc | 703 | batadv_orig_node_free_ref(orig_dst_node); |
be7af5cf ML |
704 | if (curr_gw) |
705 | gw_node_free_ref(curr_gw); | |
43676ab5 | 706 | if (neigh_old) |
7d211efc | 707 | batadv_neigh_node_free_ref(neigh_old); |
43676ab5 | 708 | if (neigh_curr) |
7d211efc | 709 | batadv_neigh_node_free_ref(neigh_curr); |
be7af5cf | 710 | return out_of_range; |
c6c8fea2 | 711 | } |