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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 | */ | |
347c80f0 SE |
36 | #define BATADV_DHCP_OPTIONS_OFFSET 240 |
37 | #define BATADV_DHCP_REQUEST 3 | |
43676ab5 | 38 | |
1409a834 | 39 | static void batadv_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 | ||
1409a834 | 45 | static struct gw_node *batadv_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 | |
1409a834 | 67 | gw_node = batadv_gw_get_selected_gw_node(bat_priv); |
c4aac1ab ML |
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) |
1409a834 | 83 | batadv_gw_node_free_ref(gw_node); |
c4aac1ab | 84 | return orig_node; |
c6c8fea2 SE |
85 | } |
86 | ||
1409a834 SE |
87 | static void batadv_gw_select(struct bat_priv *bat_priv, |
88 | 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) | |
1409a834 | 101 | batadv_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 | ||
1409a834 | 111 | static struct gw_node *batadv_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 | 140 | down * 100 * 100) / |
42d0b044 SE |
141 | (BATADV_TQ_LOCAL_WINDOW_SIZE * |
142 | BATADV_TQ_LOCAL_WINDOW_SIZE * 64); | |
c6c8fea2 SE |
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) | |
1409a834 | 148 | batadv_gw_node_free_ref(curr_gw); |
2265c141 AQ |
149 | curr_gw = gw_node; |
150 | atomic_inc(&curr_gw->refcount); | |
151 | } | |
c6c8fea2 SE |
152 | break; |
153 | ||
9cfc7bd6 | 154 | default: /* 2: stable connection (use best statistic) |
c6c8fea2 SE |
155 | * 3: fast-switch (use best statistic but change as |
156 | * soon as a better gateway appears) | |
157 | * XX: late-switch (use best statistic but change as | |
158 | * soon as a better gateway appears which has | |
159 | * $routing_class more tq points) | |
9cfc7bd6 | 160 | */ |
2265c141 AQ |
161 | if (router->tq_avg > max_tq) { |
162 | if (curr_gw) | |
1409a834 | 163 | batadv_gw_node_free_ref(curr_gw); |
2265c141 AQ |
164 | curr_gw = gw_node; |
165 | atomic_inc(&curr_gw->refcount); | |
166 | } | |
c6c8fea2 SE |
167 | break; |
168 | } | |
169 | ||
e1a5382f LL |
170 | if (router->tq_avg > max_tq) |
171 | max_tq = router->tq_avg; | |
c6c8fea2 SE |
172 | |
173 | if (tmp_gw_factor > max_gw_factor) | |
174 | max_gw_factor = tmp_gw_factor; | |
e1a5382f | 175 | |
1409a834 | 176 | batadv_gw_node_free_ref(gw_node); |
2265c141 AQ |
177 | |
178 | next: | |
7d211efc | 179 | batadv_neigh_node_free_ref(router); |
c6c8fea2 | 180 | } |
2265c141 | 181 | rcu_read_unlock(); |
c6c8fea2 | 182 | |
2265c141 AQ |
183 | return curr_gw; |
184 | } | |
c6c8fea2 | 185 | |
7cf06bc6 | 186 | void batadv_gw_election(struct bat_priv *bat_priv) |
2265c141 AQ |
187 | { |
188 | struct gw_node *curr_gw = NULL, *next_gw = NULL; | |
189 | struct neigh_node *router = NULL; | |
19595e05 | 190 | char gw_addr[18] = { '\0' }; |
2265c141 | 191 | |
9cfc7bd6 | 192 | /* The batman daemon checks here if we already passed a full originator |
2265c141 AQ |
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. | |
9cfc7bd6 | 196 | */ |
2265c141 AQ |
197 | if (atomic_read(&bat_priv->gw_mode) != GW_MODE_CLIENT) |
198 | goto out; | |
199 | ||
3e34819e | 200 | if (!batadv_atomic_dec_not_zero(&bat_priv->gw_reselect)) |
2265c141 AQ |
201 | goto out; |
202 | ||
1409a834 | 203 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
2265c141 | 204 | |
1409a834 | 205 | next_gw = batadv_gw_get_best_gw_node(bat_priv); |
2265c141 AQ |
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 | ||
7d211efc | 213 | router = batadv_orig_node_get_router(next_gw->orig_node); |
2265c141 | 214 | if (!router) { |
7cf06bc6 | 215 | batadv_gw_deselect(bat_priv); |
2265c141 AQ |
216 | goto out; |
217 | } | |
c6c8fea2 SE |
218 | } |
219 | ||
2265c141 | 220 | if ((curr_gw) && (!next_gw)) { |
1eda58bf SE |
221 | batadv_dbg(DBG_BATMAN, bat_priv, |
222 | "Removing selected gateway - no gateway in range\n"); | |
5853e22c | 223 | batadv_throw_uevent(bat_priv, UEV_GW, UEV_DEL, NULL); |
2265c141 | 224 | } else if ((!curr_gw) && (next_gw)) { |
1eda58bf SE |
225 | batadv_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, router->tq_avg); | |
5853e22c | 229 | batadv_throw_uevent(bat_priv, UEV_GW, UEV_ADD, gw_addr); |
2265c141 | 230 | } else { |
1eda58bf SE |
231 | batadv_dbg(DBG_BATMAN, bat_priv, |
232 | "Changing route to gateway %pM (gw_flags: %i, tq: %i)\n", | |
233 | next_gw->orig_node->orig, | |
234 | next_gw->orig_node->gw_flags, router->tq_avg); | |
5853e22c | 235 | batadv_throw_uevent(bat_priv, UEV_GW, UEV_CHANGE, gw_addr); |
2265c141 AQ |
236 | } |
237 | ||
1409a834 | 238 | batadv_gw_select(bat_priv, next_gw); |
2265c141 | 239 | |
c4aac1ab ML |
240 | out: |
241 | if (curr_gw) | |
1409a834 | 242 | batadv_gw_node_free_ref(curr_gw); |
2265c141 | 243 | if (next_gw) |
1409a834 | 244 | batadv_gw_node_free_ref(next_gw); |
2265c141 | 245 | if (router) |
7d211efc | 246 | batadv_neigh_node_free_ref(router); |
c6c8fea2 SE |
247 | } |
248 | ||
7cf06bc6 SE |
249 | void batadv_gw_check_election(struct bat_priv *bat_priv, |
250 | struct orig_node *orig_node) | |
c6c8fea2 | 251 | { |
57f0c07c | 252 | struct orig_node *curr_gw_orig; |
e1a5382f | 253 | struct neigh_node *router_gw = NULL, *router_orig = NULL; |
c6c8fea2 SE |
254 | uint8_t gw_tq_avg, orig_tq_avg; |
255 | ||
7cf06bc6 | 256 | curr_gw_orig = batadv_gw_get_selected_orig(bat_priv); |
57f0c07c LL |
257 | if (!curr_gw_orig) |
258 | goto deselect; | |
c6c8fea2 | 259 | |
7d211efc | 260 | router_gw = batadv_orig_node_get_router(curr_gw_orig); |
e1a5382f LL |
261 | if (!router_gw) |
262 | goto deselect; | |
c6c8fea2 SE |
263 | |
264 | /* this node already is the gateway */ | |
57f0c07c | 265 | if (curr_gw_orig == orig_node) |
e1a5382f | 266 | goto out; |
c6c8fea2 | 267 | |
7d211efc | 268 | router_orig = batadv_orig_node_get_router(orig_node); |
e1a5382f LL |
269 | if (!router_orig) |
270 | goto out; | |
5d02b3cd | 271 | |
e1a5382f LL |
272 | gw_tq_avg = router_gw->tq_avg; |
273 | orig_tq_avg = router_orig->tq_avg; | |
c6c8fea2 SE |
274 | |
275 | /* the TQ value has to be better */ | |
276 | if (orig_tq_avg < gw_tq_avg) | |
5d02b3cd | 277 | goto out; |
c6c8fea2 | 278 | |
9cfc7bd6 | 279 | /* if the routing class is greater than 3 the value tells us how much |
c6c8fea2 | 280 | * greater the TQ value of the new gateway must be |
9cfc7bd6 | 281 | */ |
c6c8fea2 SE |
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 | 285 | |
1eda58bf SE |
286 | batadv_dbg(DBG_BATMAN, bat_priv, |
287 | "Restarting gateway selection: better gateway found (tq curr: %i, tq new: %i)\n", | |
288 | gw_tq_avg, orig_tq_avg); | |
c6c8fea2 SE |
289 | |
290 | deselect: | |
7cf06bc6 | 291 | batadv_gw_deselect(bat_priv); |
5d02b3cd | 292 | out: |
57f0c07c | 293 | if (curr_gw_orig) |
7d211efc | 294 | batadv_orig_node_free_ref(curr_gw_orig); |
e1a5382f | 295 | if (router_gw) |
7d211efc | 296 | batadv_neigh_node_free_ref(router_gw); |
e1a5382f | 297 | if (router_orig) |
7d211efc | 298 | batadv_neigh_node_free_ref(router_orig); |
57f0c07c | 299 | |
5d02b3cd | 300 | return; |
c6c8fea2 SE |
301 | } |
302 | ||
1409a834 SE |
303 | static void batadv_gw_node_add(struct bat_priv *bat_priv, |
304 | struct orig_node *orig_node, | |
305 | uint8_t new_gwflags) | |
c6c8fea2 SE |
306 | { |
307 | struct gw_node *gw_node; | |
308 | int down, up; | |
309 | ||
704509b8 | 310 | gw_node = kzalloc(sizeof(*gw_node), GFP_ATOMIC); |
c6c8fea2 SE |
311 | if (!gw_node) |
312 | return; | |
313 | ||
c6c8fea2 SE |
314 | INIT_HLIST_NODE(&gw_node->list); |
315 | gw_node->orig_node = orig_node; | |
25b6d3c1 | 316 | atomic_set(&gw_node->refcount, 1); |
c6c8fea2 SE |
317 | |
318 | spin_lock_bh(&bat_priv->gw_list_lock); | |
319 | hlist_add_head_rcu(&gw_node->list, &bat_priv->gw_list); | |
320 | spin_unlock_bh(&bat_priv->gw_list_lock); | |
321 | ||
84d5e5e0 | 322 | batadv_gw_bandwidth_to_kbit(new_gwflags, &down, &up); |
1eda58bf SE |
323 | batadv_dbg(DBG_BATMAN, bat_priv, |
324 | "Found new gateway %pM -> gw_class: %i - %i%s/%i%s\n", | |
325 | orig_node->orig, new_gwflags, | |
326 | (down > 2048 ? down / 1024 : down), | |
327 | (down > 2048 ? "MBit" : "KBit"), | |
328 | (up > 2048 ? up / 1024 : up), | |
329 | (up > 2048 ? "MBit" : "KBit")); | |
c6c8fea2 SE |
330 | } |
331 | ||
7cf06bc6 SE |
332 | void batadv_gw_node_update(struct bat_priv *bat_priv, |
333 | struct orig_node *orig_node, uint8_t new_gwflags) | |
c6c8fea2 SE |
334 | { |
335 | struct hlist_node *node; | |
c4aac1ab ML |
336 | struct gw_node *gw_node, *curr_gw; |
337 | ||
9cfc7bd6 | 338 | /* Note: We don't need a NULL check here, since curr_gw never gets |
71e4aa9c AQ |
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 | */ | |
1409a834 | 343 | curr_gw = batadv_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 | ||
1eda58bf SE |
350 | batadv_dbg(DBG_BATMAN, bat_priv, |
351 | "Gateway class of originator %pM changed from %i to %i\n", | |
352 | orig_node->orig, gw_node->orig_node->gw_flags, | |
353 | new_gwflags); | |
c6c8fea2 SE |
354 | |
355 | gw_node->deleted = 0; | |
356 | ||
42d0b044 | 357 | if (new_gwflags == BATADV_NO_FLAGS) { |
c6c8fea2 | 358 | gw_node->deleted = jiffies; |
1eda58bf SE |
359 | batadv_dbg(DBG_BATMAN, bat_priv, |
360 | "Gateway %pM removed from gateway list\n", | |
361 | orig_node->orig); | |
c6c8fea2 | 362 | |
c4aac1ab ML |
363 | if (gw_node == curr_gw) |
364 | goto deselect; | |
c6c8fea2 SE |
365 | } |
366 | ||
c4aac1ab | 367 | goto unlock; |
c6c8fea2 | 368 | } |
c6c8fea2 | 369 | |
42d0b044 | 370 | if (new_gwflags == BATADV_NO_FLAGS) |
c4aac1ab | 371 | goto unlock; |
c6c8fea2 | 372 | |
1409a834 | 373 | batadv_gw_node_add(bat_priv, orig_node, new_gwflags); |
c4aac1ab ML |
374 | goto unlock; |
375 | ||
376 | deselect: | |
7cf06bc6 | 377 | batadv_gw_deselect(bat_priv); |
c4aac1ab ML |
378 | unlock: |
379 | rcu_read_unlock(); | |
71e4aa9c | 380 | |
c4aac1ab | 381 | if (curr_gw) |
1409a834 | 382 | batadv_gw_node_free_ref(curr_gw); |
c6c8fea2 SE |
383 | } |
384 | ||
7cf06bc6 SE |
385 | void batadv_gw_node_delete(struct bat_priv *bat_priv, |
386 | struct orig_node *orig_node) | |
c6c8fea2 | 387 | { |
7cf06bc6 | 388 | batadv_gw_node_update(bat_priv, orig_node, 0); |
c6c8fea2 SE |
389 | } |
390 | ||
7cf06bc6 | 391 | void batadv_gw_node_purge(struct bat_priv *bat_priv) |
c6c8fea2 | 392 | { |
c4aac1ab | 393 | struct gw_node *gw_node, *curr_gw; |
c6c8fea2 | 394 | struct hlist_node *node, *node_tmp; |
42d0b044 | 395 | unsigned long timeout = msecs_to_jiffies(2 * BATADV_PURGE_TIMEOUT); |
b4e17054 | 396 | int do_deselect = 0; |
c4aac1ab | 397 | |
1409a834 | 398 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
c6c8fea2 SE |
399 | |
400 | spin_lock_bh(&bat_priv->gw_list_lock); | |
401 | ||
402 | hlist_for_each_entry_safe(gw_node, node, node_tmp, | |
403 | &bat_priv->gw_list, list) { | |
404 | if (((!gw_node->deleted) || | |
405 | (time_before(jiffies, gw_node->deleted + timeout))) && | |
406 | atomic_read(&bat_priv->mesh_state) == MESH_ACTIVE) | |
407 | continue; | |
408 | ||
c4aac1ab ML |
409 | if (curr_gw == gw_node) |
410 | do_deselect = 1; | |
c6c8fea2 SE |
411 | |
412 | hlist_del_rcu(&gw_node->list); | |
1409a834 | 413 | batadv_gw_node_free_ref(gw_node); |
c6c8fea2 SE |
414 | } |
415 | ||
c6c8fea2 | 416 | spin_unlock_bh(&bat_priv->gw_list_lock); |
c4aac1ab ML |
417 | |
418 | /* gw_deselect() needs to acquire the gw_list_lock */ | |
419 | if (do_deselect) | |
7cf06bc6 | 420 | batadv_gw_deselect(bat_priv); |
c4aac1ab ML |
421 | |
422 | if (curr_gw) | |
1409a834 | 423 | batadv_gw_node_free_ref(curr_gw); |
c6c8fea2 SE |
424 | } |
425 | ||
9cfc7bd6 | 426 | /* fails if orig_node has no router */ |
1409a834 SE |
427 | static int batadv_write_buffer_text(struct bat_priv *bat_priv, |
428 | 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 | 434 | |
84d5e5e0 | 435 | batadv_gw_bandwidth_to_kbit(gw_node->orig_node->gw_flags, &down, &up); |
c6c8fea2 | 436 | |
7d211efc | 437 | router = batadv_orig_node_get_router(gw_node->orig_node); |
e1a5382f LL |
438 | if (!router) |
439 | goto out; | |
5d02b3cd | 440 | |
1409a834 | 441 | curr_gw = batadv_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 | |
7d211efc | 454 | batadv_neigh_node_free_ref(router); |
c4aac1ab | 455 | if (curr_gw) |
1409a834 | 456 | batadv_gw_node_free_ref(curr_gw); |
e1a5382f | 457 | out: |
5d02b3cd | 458 | return ret; |
c6c8fea2 SE |
459 | } |
460 | ||
7cf06bc6 | 461 | int batadv_gw_client_seq_print_text(struct seq_file *seq, void *offset) |
c6c8fea2 SE |
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 | |
e5d89254 | 470 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 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", | |
42d0b044 SE |
487 | "Gateway", "#", BATADV_TQ_MAX_VALUE, "Nexthop", "outgoingIF", |
488 | BATADV_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 | 496 | /* fails if orig_node has no router */ |
1409a834 | 497 | if (batadv_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) | |
e5d89254 | 509 | batadv_hardif_free_ref(primary_if); |
32ae9b22 | 510 | return ret; |
c6c8fea2 SE |
511 | } |
512 | ||
1409a834 | 513 | static bool batadv_is_type_dhcprequest(struct sk_buff *skb, int header_len) |
43676ab5 AQ |
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 | ||
347c80f0 | 524 | if (pkt_len < header_len + BATADV_DHCP_OPTIONS_OFFSET + 1) |
43676ab5 AQ |
525 | goto out; |
526 | ||
347c80f0 SE |
527 | p = skb->data + header_len + BATADV_DHCP_OPTIONS_OFFSET; |
528 | pkt_len -= header_len + BATADV_DHCP_OPTIONS_OFFSET + 1; | |
43676ab5 AQ |
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) | |
9cfc7bd6 SE |
533 | * - octet 3: option data |
534 | */ | |
43676ab5 | 535 | while (*p != 255 && !ret) { |
015758d0 | 536 | /* p now points to the first octet: option type */ |
43676ab5 AQ |
537 | if (*p == 53) { |
538 | /* type 53 is the message type option. | |
9cfc7bd6 SE |
539 | * Jump the len octet and go to the data octet |
540 | */ | |
43676ab5 AQ |
541 | if (pkt_len < 2) |
542 | goto out; | |
543 | p += 2; | |
544 | ||
545 | /* check if the message type is what we need */ | |
347c80f0 | 546 | if (*p == BATADV_DHCP_REQUEST) |
43676ab5 AQ |
547 | ret = true; |
548 | break; | |
549 | } else if (*p == 0) { | |
550 | /* option type 0 (padding), just go forward */ | |
551 | if (pkt_len < 1) | |
552 | goto out; | |
553 | pkt_len--; | |
554 | p++; | |
555 | } else { | |
556 | /* This is any other option. So we get the length... */ | |
557 | if (pkt_len < 1) | |
558 | goto out; | |
559 | pkt_len--; | |
560 | p++; | |
561 | ||
562 | /* ...and then we jump over the data */ | |
9205cc52 | 563 | if (pkt_len < 1 + (*p)) |
43676ab5 | 564 | goto out; |
9205cc52 AQ |
565 | pkt_len -= 1 + (*p); |
566 | p += 1 + (*p); | |
43676ab5 AQ |
567 | } |
568 | } | |
569 | out: | |
570 | return ret; | |
571 | } | |
572 | ||
7cf06bc6 | 573 | bool batadv_gw_is_dhcp_target(struct sk_buff *skb, unsigned int *header_len) |
c6c8fea2 SE |
574 | { |
575 | struct ethhdr *ethhdr; | |
576 | struct iphdr *iphdr; | |
577 | struct ipv6hdr *ipv6hdr; | |
578 | struct udphdr *udphdr; | |
c6c8fea2 SE |
579 | |
580 | /* check for ethernet header */ | |
be7af5cf ML |
581 | if (!pskb_may_pull(skb, *header_len + ETH_HLEN)) |
582 | return false; | |
c6c8fea2 | 583 | ethhdr = (struct ethhdr *)skb->data; |
be7af5cf | 584 | *header_len += ETH_HLEN; |
c6c8fea2 SE |
585 | |
586 | /* check for initial vlan header */ | |
587 | if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) { | |
be7af5cf ML |
588 | if (!pskb_may_pull(skb, *header_len + VLAN_HLEN)) |
589 | return false; | |
c6c8fea2 | 590 | ethhdr = (struct ethhdr *)(skb->data + VLAN_HLEN); |
be7af5cf | 591 | *header_len += VLAN_HLEN; |
c6c8fea2 SE |
592 | } |
593 | ||
594 | /* check for ip header */ | |
595 | switch (ntohs(ethhdr->h_proto)) { | |
596 | case ETH_P_IP: | |
be7af5cf ML |
597 | if (!pskb_may_pull(skb, *header_len + sizeof(*iphdr))) |
598 | return false; | |
599 | iphdr = (struct iphdr *)(skb->data + *header_len); | |
600 | *header_len += iphdr->ihl * 4; | |
c6c8fea2 SE |
601 | |
602 | /* check for udp header */ | |
603 | if (iphdr->protocol != IPPROTO_UDP) | |
be7af5cf | 604 | return false; |
c6c8fea2 SE |
605 | |
606 | break; | |
607 | case ETH_P_IPV6: | |
be7af5cf ML |
608 | if (!pskb_may_pull(skb, *header_len + sizeof(*ipv6hdr))) |
609 | return false; | |
610 | ipv6hdr = (struct ipv6hdr *)(skb->data + *header_len); | |
611 | *header_len += sizeof(*ipv6hdr); | |
c6c8fea2 SE |
612 | |
613 | /* check for udp header */ | |
614 | if (ipv6hdr->nexthdr != IPPROTO_UDP) | |
be7af5cf | 615 | return false; |
c6c8fea2 SE |
616 | |
617 | break; | |
618 | default: | |
be7af5cf | 619 | return false; |
c6c8fea2 SE |
620 | } |
621 | ||
be7af5cf ML |
622 | if (!pskb_may_pull(skb, *header_len + sizeof(*udphdr))) |
623 | return false; | |
624 | udphdr = (struct udphdr *)(skb->data + *header_len); | |
625 | *header_len += sizeof(*udphdr); | |
c6c8fea2 SE |
626 | |
627 | /* check for bootp port */ | |
628 | if ((ntohs(ethhdr->h_proto) == ETH_P_IP) && | |
7c64fd98 | 629 | (ntohs(udphdr->dest) != 67)) |
be7af5cf | 630 | return false; |
c6c8fea2 SE |
631 | |
632 | if ((ntohs(ethhdr->h_proto) == ETH_P_IPV6) && | |
633 | (ntohs(udphdr->dest) != 547)) | |
be7af5cf | 634 | return false; |
c6c8fea2 | 635 | |
be7af5cf ML |
636 | return true; |
637 | } | |
c6c8fea2 | 638 | |
7cf06bc6 SE |
639 | bool batadv_gw_out_of_range(struct bat_priv *bat_priv, |
640 | struct sk_buff *skb, struct ethhdr *ethhdr) | |
be7af5cf ML |
641 | { |
642 | struct neigh_node *neigh_curr = NULL, *neigh_old = NULL; | |
643 | struct orig_node *orig_dst_node = NULL; | |
644 | struct gw_node *curr_gw = NULL; | |
645 | bool ret, out_of_range = false; | |
646 | unsigned int header_len = 0; | |
647 | uint8_t curr_tq_avg; | |
648 | ||
7cf06bc6 | 649 | ret = batadv_gw_is_dhcp_target(skb, &header_len); |
be7af5cf ML |
650 | if (!ret) |
651 | goto out; | |
652 | ||
08c36d3e SE |
653 | orig_dst_node = batadv_transtable_search(bat_priv, ethhdr->h_source, |
654 | ethhdr->h_dest); | |
be7af5cf ML |
655 | if (!orig_dst_node) |
656 | goto out; | |
657 | ||
658 | if (!orig_dst_node->gw_flags) | |
659 | goto out; | |
660 | ||
1409a834 | 661 | ret = batadv_is_type_dhcprequest(skb, header_len); |
be7af5cf ML |
662 | if (!ret) |
663 | goto out; | |
664 | ||
665 | switch (atomic_read(&bat_priv->gw_mode)) { | |
666 | case GW_MODE_SERVER: | |
667 | /* If we are a GW then we are our best GW. We can artificially | |
9cfc7bd6 SE |
668 | * set the tq towards ourself as the maximum value |
669 | */ | |
42d0b044 | 670 | curr_tq_avg = BATADV_TQ_MAX_VALUE; |
be7af5cf ML |
671 | break; |
672 | case GW_MODE_CLIENT: | |
1409a834 | 673 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
be7af5cf ML |
674 | if (!curr_gw) |
675 | goto out; | |
676 | ||
677 | /* packet is going to our gateway */ | |
678 | if (curr_gw->orig_node == orig_dst_node) | |
679 | goto out; | |
680 | ||
681 | /* If the dhcp packet has been sent to a different gw, | |
682 | * we have to evaluate whether the old gw is still | |
9cfc7bd6 SE |
683 | * reliable enough |
684 | */ | |
30d3c511 SE |
685 | neigh_curr = batadv_find_router(bat_priv, curr_gw->orig_node, |
686 | NULL); | |
be7af5cf ML |
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 | 696 | |
30d3c511 | 697 | neigh_old = batadv_find_router(bat_priv, orig_dst_node, NULL); |
2ef04f47 | 698 | if (!neigh_old) |
be7af5cf ML |
699 | goto out; |
700 | ||
42d0b044 | 701 | if (curr_tq_avg - neigh_old->tq_avg > BATADV_GW_THRESHOLD) |
be7af5cf ML |
702 | out_of_range = true; |
703 | ||
704 | out: | |
705 | if (orig_dst_node) | |
7d211efc | 706 | batadv_orig_node_free_ref(orig_dst_node); |
be7af5cf | 707 | if (curr_gw) |
1409a834 | 708 | batadv_gw_node_free_ref(curr_gw); |
43676ab5 | 709 | if (neigh_old) |
7d211efc | 710 | batadv_neigh_node_free_ref(neigh_old); |
43676ab5 | 711 | if (neigh_curr) |
7d211efc | 712 | batadv_neigh_node_free_ref(neigh_curr); |
be7af5cf | 713 | return out_of_range; |
c6c8fea2 | 714 | } |