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0b873931 | 1 | /* Copyright (C) 2009-2013 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" | |
b706b13b | 21 | #include "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 | |
56303d34 | 39 | static void batadv_gw_node_free_ref(struct batadv_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 | ||
56303d34 SE |
45 | static struct batadv_gw_node * |
46 | batadv_gw_get_selected_gw_node(struct batadv_priv *bat_priv) | |
c6c8fea2 | 47 | { |
56303d34 | 48 | struct batadv_gw_node *gw_node; |
c6c8fea2 | 49 | |
5d02b3cd | 50 | rcu_read_lock(); |
807736f6 | 51 | gw_node = rcu_dereference(bat_priv->gw.curr_gw); |
c4aac1ab | 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 | ||
56303d34 SE |
63 | struct batadv_orig_node * |
64 | batadv_gw_get_selected_orig(struct batadv_priv *bat_priv) | |
c6c8fea2 | 65 | { |
56303d34 SE |
66 | struct batadv_gw_node *gw_node; |
67 | struct batadv_orig_node *orig_node = NULL; | |
c6c8fea2 | 68 | |
1409a834 | 69 | gw_node = batadv_gw_get_selected_gw_node(bat_priv); |
c4aac1ab ML |
70 | if (!gw_node) |
71 | goto out; | |
72 | ||
73 | rcu_read_lock(); | |
74 | orig_node = gw_node->orig_node; | |
75 | if (!orig_node) | |
76 | goto unlock; | |
77 | ||
78 | if (!atomic_inc_not_zero(&orig_node->refcount)) | |
79 | orig_node = NULL; | |
c6c8fea2 | 80 | |
c4aac1ab ML |
81 | unlock: |
82 | rcu_read_unlock(); | |
83 | out: | |
c6c8fea2 | 84 | if (gw_node) |
1409a834 | 85 | batadv_gw_node_free_ref(gw_node); |
c4aac1ab | 86 | return orig_node; |
c6c8fea2 SE |
87 | } |
88 | ||
56303d34 SE |
89 | static void batadv_gw_select(struct batadv_priv *bat_priv, |
90 | struct batadv_gw_node *new_gw_node) | |
c6c8fea2 | 91 | { |
56303d34 | 92 | struct batadv_gw_node *curr_gw_node; |
c6c8fea2 | 93 | |
807736f6 | 94 | spin_lock_bh(&bat_priv->gw.list_lock); |
c4aac1ab | 95 | |
25b6d3c1 ML |
96 | if (new_gw_node && !atomic_inc_not_zero(&new_gw_node->refcount)) |
97 | new_gw_node = NULL; | |
c6c8fea2 | 98 | |
807736f6 SE |
99 | curr_gw_node = rcu_dereference_protected(bat_priv->gw.curr_gw, 1); |
100 | rcu_assign_pointer(bat_priv->gw.curr_gw, new_gw_node); | |
25b6d3c1 ML |
101 | |
102 | if (curr_gw_node) | |
1409a834 | 103 | batadv_gw_node_free_ref(curr_gw_node); |
c4aac1ab | 104 | |
807736f6 | 105 | spin_unlock_bh(&bat_priv->gw.list_lock); |
c4aac1ab ML |
106 | } |
107 | ||
56303d34 | 108 | void batadv_gw_deselect(struct batadv_priv *bat_priv) |
c4aac1ab | 109 | { |
807736f6 | 110 | atomic_set(&bat_priv->gw.reselect, 1); |
c6c8fea2 SE |
111 | } |
112 | ||
56303d34 SE |
113 | static struct batadv_gw_node * |
114 | batadv_gw_get_best_gw_node(struct batadv_priv *bat_priv) | |
c6c8fea2 | 115 | { |
56303d34 | 116 | struct batadv_neigh_node *router; |
56303d34 | 117 | struct batadv_gw_node *gw_node, *curr_gw = NULL; |
c6c8fea2 | 118 | uint32_t max_gw_factor = 0, tmp_gw_factor = 0; |
c67893d1 | 119 | uint32_t gw_divisor; |
2265c141 | 120 | uint8_t max_tq = 0; |
c67893d1 | 121 | uint8_t tq_avg; |
56303d34 | 122 | struct batadv_orig_node *orig_node; |
c6c8fea2 | 123 | |
c67893d1 SE |
124 | gw_divisor = BATADV_TQ_LOCAL_WINDOW_SIZE * BATADV_TQ_LOCAL_WINDOW_SIZE; |
125 | gw_divisor *= 64; | |
126 | ||
c4aac1ab | 127 | rcu_read_lock(); |
b67bfe0d | 128 | hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.list, list) { |
e1a5382f | 129 | if (gw_node->deleted) |
c6c8fea2 SE |
130 | continue; |
131 | ||
84d5e5e0 | 132 | orig_node = gw_node->orig_node; |
7d211efc | 133 | router = batadv_orig_node_get_router(orig_node); |
e1a5382f | 134 | if (!router) |
c6c8fea2 SE |
135 | continue; |
136 | ||
2265c141 AQ |
137 | if (!atomic_inc_not_zero(&gw_node->refcount)) |
138 | goto next; | |
139 | ||
c67893d1 SE |
140 | tq_avg = router->tq_avg; |
141 | ||
c6c8fea2 SE |
142 | switch (atomic_read(&bat_priv->gw_sel_class)) { |
143 | case 1: /* fast connection */ | |
414254e3 ML |
144 | tmp_gw_factor = tq_avg * tq_avg; |
145 | tmp_gw_factor *= gw_node->bandwidth_down; | |
146 | tmp_gw_factor *= 100 * 100; | |
c67893d1 | 147 | tmp_gw_factor /= gw_divisor; |
c6c8fea2 SE |
148 | |
149 | if ((tmp_gw_factor > max_gw_factor) || | |
150 | ((tmp_gw_factor == max_gw_factor) && | |
c67893d1 | 151 | (tq_avg > max_tq))) { |
2265c141 | 152 | if (curr_gw) |
1409a834 | 153 | batadv_gw_node_free_ref(curr_gw); |
2265c141 AQ |
154 | curr_gw = gw_node; |
155 | atomic_inc(&curr_gw->refcount); | |
156 | } | |
c6c8fea2 SE |
157 | break; |
158 | ||
9cfc7bd6 | 159 | default: /* 2: stable connection (use best statistic) |
c6c8fea2 SE |
160 | * 3: fast-switch (use best statistic but change as |
161 | * soon as a better gateway appears) | |
162 | * XX: late-switch (use best statistic but change as | |
163 | * soon as a better gateway appears which has | |
164 | * $routing_class more tq points) | |
9cfc7bd6 | 165 | */ |
c67893d1 | 166 | if (tq_avg > max_tq) { |
2265c141 | 167 | if (curr_gw) |
1409a834 | 168 | batadv_gw_node_free_ref(curr_gw); |
2265c141 AQ |
169 | curr_gw = gw_node; |
170 | atomic_inc(&curr_gw->refcount); | |
171 | } | |
c6c8fea2 SE |
172 | break; |
173 | } | |
174 | ||
c67893d1 SE |
175 | if (tq_avg > max_tq) |
176 | max_tq = tq_avg; | |
c6c8fea2 SE |
177 | |
178 | if (tmp_gw_factor > max_gw_factor) | |
179 | max_gw_factor = tmp_gw_factor; | |
e1a5382f | 180 | |
1409a834 | 181 | batadv_gw_node_free_ref(gw_node); |
2265c141 AQ |
182 | |
183 | next: | |
7d211efc | 184 | batadv_neigh_node_free_ref(router); |
c6c8fea2 | 185 | } |
2265c141 | 186 | rcu_read_unlock(); |
c6c8fea2 | 187 | |
2265c141 AQ |
188 | return curr_gw; |
189 | } | |
c6c8fea2 | 190 | |
c6eaa3f0 AQ |
191 | /** |
192 | * batadv_gw_check_client_stop - check if client mode has been switched off | |
193 | * @bat_priv: the bat priv with all the soft interface information | |
194 | * | |
195 | * This function assumes the caller has checked that the gw state *is actually | |
196 | * changing*. This function is not supposed to be called when there is no state | |
197 | * change. | |
198 | */ | |
199 | void batadv_gw_check_client_stop(struct batadv_priv *bat_priv) | |
200 | { | |
201 | struct batadv_gw_node *curr_gw; | |
202 | ||
203 | if (atomic_read(&bat_priv->gw_mode) != BATADV_GW_MODE_CLIENT) | |
204 | return; | |
205 | ||
206 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); | |
207 | if (!curr_gw) | |
208 | return; | |
209 | ||
210 | /* if batman-adv is switching the gw client mode off and a gateway was | |
211 | * already selected, send a DEL uevent | |
212 | */ | |
213 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL, NULL); | |
214 | ||
215 | batadv_gw_node_free_ref(curr_gw); | |
216 | } | |
217 | ||
56303d34 | 218 | void batadv_gw_election(struct batadv_priv *bat_priv) |
2265c141 | 219 | { |
56303d34 SE |
220 | struct batadv_gw_node *curr_gw = NULL, *next_gw = NULL; |
221 | struct batadv_neigh_node *router = NULL; | |
19595e05 | 222 | char gw_addr[18] = { '\0' }; |
2265c141 | 223 | |
9cfc7bd6 | 224 | /* The batman daemon checks here if we already passed a full originator |
2265c141 AQ |
225 | * cycle in order to make sure we don't choose the first gateway we |
226 | * hear about. This check is based on the daemon's uptime which we | |
227 | * don't have. | |
9cfc7bd6 | 228 | */ |
cd646ab1 | 229 | if (atomic_read(&bat_priv->gw_mode) != BATADV_GW_MODE_CLIENT) |
2265c141 AQ |
230 | goto out; |
231 | ||
1409a834 | 232 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
2265c141 | 233 | |
807736f6 | 234 | if (!batadv_atomic_dec_not_zero(&bat_priv->gw.reselect) && curr_gw) |
caa0bf64 ML |
235 | goto out; |
236 | ||
1409a834 | 237 | next_gw = batadv_gw_get_best_gw_node(bat_priv); |
2265c141 AQ |
238 | |
239 | if (curr_gw == next_gw) | |
240 | goto out; | |
241 | ||
242 | if (next_gw) { | |
19595e05 AQ |
243 | sprintf(gw_addr, "%pM", next_gw->orig_node->orig); |
244 | ||
7d211efc | 245 | router = batadv_orig_node_get_router(next_gw->orig_node); |
2265c141 | 246 | if (!router) { |
7cf06bc6 | 247 | batadv_gw_deselect(bat_priv); |
2265c141 AQ |
248 | goto out; |
249 | } | |
c6c8fea2 SE |
250 | } |
251 | ||
2265c141 | 252 | if ((curr_gw) && (!next_gw)) { |
39c75a51 | 253 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 254 | "Removing selected gateway - no gateway in range\n"); |
39c75a51 SE |
255 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL, |
256 | NULL); | |
2265c141 | 257 | } else if ((!curr_gw) && (next_gw)) { |
39c75a51 | 258 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
414254e3 | 259 | "Adding route to gateway %pM (bandwidth: %u.%u/%u.%u MBit, tq: %i)\n", |
1eda58bf | 260 | next_gw->orig_node->orig, |
414254e3 ML |
261 | next_gw->bandwidth_down / 10, |
262 | next_gw->bandwidth_down % 10, | |
263 | next_gw->bandwidth_up / 10, | |
264 | next_gw->bandwidth_up % 10, router->tq_avg); | |
39c75a51 SE |
265 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_ADD, |
266 | gw_addr); | |
2265c141 | 267 | } else { |
39c75a51 | 268 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
414254e3 | 269 | "Changing route to gateway %pM (bandwidth: %u.%u/%u.%u MBit, tq: %i)\n", |
1eda58bf | 270 | next_gw->orig_node->orig, |
414254e3 ML |
271 | next_gw->bandwidth_down / 10, |
272 | next_gw->bandwidth_down % 10, | |
273 | next_gw->bandwidth_up / 10, | |
274 | next_gw->bandwidth_up % 10, router->tq_avg); | |
39c75a51 SE |
275 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_CHANGE, |
276 | gw_addr); | |
2265c141 AQ |
277 | } |
278 | ||
1409a834 | 279 | batadv_gw_select(bat_priv, next_gw); |
2265c141 | 280 | |
c4aac1ab ML |
281 | out: |
282 | if (curr_gw) | |
1409a834 | 283 | batadv_gw_node_free_ref(curr_gw); |
2265c141 | 284 | if (next_gw) |
1409a834 | 285 | batadv_gw_node_free_ref(next_gw); |
2265c141 | 286 | if (router) |
7d211efc | 287 | batadv_neigh_node_free_ref(router); |
c6c8fea2 SE |
288 | } |
289 | ||
56303d34 SE |
290 | void batadv_gw_check_election(struct batadv_priv *bat_priv, |
291 | struct batadv_orig_node *orig_node) | |
c6c8fea2 | 292 | { |
56303d34 SE |
293 | struct batadv_orig_node *curr_gw_orig; |
294 | struct batadv_neigh_node *router_gw = NULL, *router_orig = NULL; | |
c6c8fea2 SE |
295 | uint8_t gw_tq_avg, orig_tq_avg; |
296 | ||
7cf06bc6 | 297 | curr_gw_orig = batadv_gw_get_selected_orig(bat_priv); |
57f0c07c LL |
298 | if (!curr_gw_orig) |
299 | goto deselect; | |
c6c8fea2 | 300 | |
7d211efc | 301 | router_gw = batadv_orig_node_get_router(curr_gw_orig); |
e1a5382f LL |
302 | if (!router_gw) |
303 | goto deselect; | |
c6c8fea2 SE |
304 | |
305 | /* this node already is the gateway */ | |
57f0c07c | 306 | if (curr_gw_orig == orig_node) |
e1a5382f | 307 | goto out; |
c6c8fea2 | 308 | |
7d211efc | 309 | router_orig = batadv_orig_node_get_router(orig_node); |
e1a5382f LL |
310 | if (!router_orig) |
311 | goto out; | |
5d02b3cd | 312 | |
e1a5382f LL |
313 | gw_tq_avg = router_gw->tq_avg; |
314 | orig_tq_avg = router_orig->tq_avg; | |
c6c8fea2 SE |
315 | |
316 | /* the TQ value has to be better */ | |
317 | if (orig_tq_avg < gw_tq_avg) | |
5d02b3cd | 318 | goto out; |
c6c8fea2 | 319 | |
9cfc7bd6 | 320 | /* if the routing class is greater than 3 the value tells us how much |
c6c8fea2 | 321 | * greater the TQ value of the new gateway must be |
9cfc7bd6 | 322 | */ |
c6c8fea2 SE |
323 | if ((atomic_read(&bat_priv->gw_sel_class) > 3) && |
324 | (orig_tq_avg - gw_tq_avg < atomic_read(&bat_priv->gw_sel_class))) | |
5d02b3cd | 325 | goto out; |
c6c8fea2 | 326 | |
39c75a51 | 327 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
328 | "Restarting gateway selection: better gateway found (tq curr: %i, tq new: %i)\n", |
329 | gw_tq_avg, orig_tq_avg); | |
c6c8fea2 SE |
330 | |
331 | deselect: | |
7cf06bc6 | 332 | batadv_gw_deselect(bat_priv); |
5d02b3cd | 333 | out: |
57f0c07c | 334 | if (curr_gw_orig) |
7d211efc | 335 | batadv_orig_node_free_ref(curr_gw_orig); |
e1a5382f | 336 | if (router_gw) |
7d211efc | 337 | batadv_neigh_node_free_ref(router_gw); |
e1a5382f | 338 | if (router_orig) |
7d211efc | 339 | batadv_neigh_node_free_ref(router_orig); |
57f0c07c | 340 | |
5d02b3cd | 341 | return; |
c6c8fea2 SE |
342 | } |
343 | ||
414254e3 ML |
344 | /** |
345 | * batadv_gw_node_add - add gateway node to list of available gateways | |
346 | * @bat_priv: the bat priv with all the soft interface information | |
347 | * @orig_node: originator announcing gateway capabilities | |
348 | * @gateway: announced bandwidth information | |
349 | */ | |
56303d34 SE |
350 | static void batadv_gw_node_add(struct batadv_priv *bat_priv, |
351 | struct batadv_orig_node *orig_node, | |
414254e3 | 352 | struct batadv_tvlv_gateway_data *gateway) |
c6c8fea2 | 353 | { |
56303d34 | 354 | struct batadv_gw_node *gw_node; |
414254e3 ML |
355 | |
356 | if (gateway->bandwidth_down == 0) | |
357 | return; | |
c6c8fea2 | 358 | |
704509b8 | 359 | gw_node = kzalloc(sizeof(*gw_node), GFP_ATOMIC); |
c6c8fea2 SE |
360 | if (!gw_node) |
361 | return; | |
362 | ||
c6c8fea2 SE |
363 | INIT_HLIST_NODE(&gw_node->list); |
364 | gw_node->orig_node = orig_node; | |
25b6d3c1 | 365 | atomic_set(&gw_node->refcount, 1); |
c6c8fea2 | 366 | |
807736f6 SE |
367 | spin_lock_bh(&bat_priv->gw.list_lock); |
368 | hlist_add_head_rcu(&gw_node->list, &bat_priv->gw.list); | |
369 | spin_unlock_bh(&bat_priv->gw.list_lock); | |
c6c8fea2 | 370 | |
39c75a51 | 371 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
414254e3 ML |
372 | "Found new gateway %pM -> gw bandwidth: %u.%u/%u.%u MBit\n", |
373 | orig_node->orig, | |
374 | ntohl(gateway->bandwidth_down) / 10, | |
375 | ntohl(gateway->bandwidth_down) % 10, | |
376 | ntohl(gateway->bandwidth_up) / 10, | |
377 | ntohl(gateway->bandwidth_up) % 10); | |
c6c8fea2 SE |
378 | } |
379 | ||
414254e3 ML |
380 | /** |
381 | * batadv_gw_node_get - retrieve gateway node from list of available gateways | |
382 | * @bat_priv: the bat priv with all the soft interface information | |
383 | * @orig_node: originator announcing gateway capabilities | |
384 | * | |
385 | * Returns gateway node if found or NULL otherwise. | |
386 | */ | |
387 | static struct batadv_gw_node * | |
388 | batadv_gw_node_get(struct batadv_priv *bat_priv, | |
389 | struct batadv_orig_node *orig_node) | |
c6c8fea2 | 390 | { |
414254e3 | 391 | struct batadv_gw_node *gw_node_tmp, *gw_node = NULL; |
c6c8fea2 SE |
392 | |
393 | rcu_read_lock(); | |
414254e3 ML |
394 | hlist_for_each_entry_rcu(gw_node_tmp, &bat_priv->gw.list, list) { |
395 | if (gw_node_tmp->orig_node != orig_node) | |
c6c8fea2 SE |
396 | continue; |
397 | ||
414254e3 ML |
398 | if (gw_node_tmp->deleted) |
399 | continue; | |
c6c8fea2 | 400 | |
414254e3 ML |
401 | if (!atomic_inc_not_zero(&gw_node_tmp->refcount)) |
402 | continue; | |
c6c8fea2 | 403 | |
414254e3 ML |
404 | gw_node = gw_node_tmp; |
405 | break; | |
406 | } | |
407 | rcu_read_unlock(); | |
c6c8fea2 | 408 | |
414254e3 ML |
409 | return gw_node; |
410 | } | |
c6c8fea2 | 411 | |
414254e3 ML |
412 | /** |
413 | * batadv_gw_node_update - update list of available gateways with changed | |
414 | * bandwidth information | |
415 | * @bat_priv: the bat priv with all the soft interface information | |
416 | * @orig_node: originator announcing gateway capabilities | |
417 | * @gateway: announced bandwidth information | |
418 | */ | |
419 | void batadv_gw_node_update(struct batadv_priv *bat_priv, | |
420 | struct batadv_orig_node *orig_node, | |
421 | struct batadv_tvlv_gateway_data *gateway) | |
422 | { | |
423 | struct batadv_gw_node *gw_node, *curr_gw = NULL; | |
424 | ||
425 | gw_node = batadv_gw_node_get(bat_priv, orig_node); | |
426 | if (!gw_node) { | |
427 | batadv_gw_node_add(bat_priv, orig_node, gateway); | |
428 | goto out; | |
c6c8fea2 | 429 | } |
c6c8fea2 | 430 | |
414254e3 ML |
431 | if ((gw_node->bandwidth_down == ntohl(gateway->bandwidth_down)) && |
432 | (gw_node->bandwidth_up == ntohl(gateway->bandwidth_up))) | |
433 | goto out; | |
c6c8fea2 | 434 | |
414254e3 ML |
435 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
436 | "Gateway bandwidth of originator %pM changed from %u.%u/%u.%u MBit to %u.%u/%u.%u MBit\n", | |
437 | orig_node->orig, | |
438 | gw_node->bandwidth_down / 10, | |
439 | gw_node->bandwidth_down % 10, | |
440 | gw_node->bandwidth_up / 10, | |
441 | gw_node->bandwidth_up % 10, | |
442 | ntohl(gateway->bandwidth_down) / 10, | |
443 | ntohl(gateway->bandwidth_down) % 10, | |
444 | ntohl(gateway->bandwidth_up) / 10, | |
445 | ntohl(gateway->bandwidth_up) % 10); | |
446 | ||
447 | gw_node->bandwidth_down = ntohl(gateway->bandwidth_down); | |
448 | gw_node->bandwidth_up = ntohl(gateway->bandwidth_up); | |
449 | ||
450 | gw_node->deleted = 0; | |
451 | if (ntohl(gateway->bandwidth_down) == 0) { | |
452 | gw_node->deleted = jiffies; | |
453 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
454 | "Gateway %pM removed from gateway list\n", | |
455 | orig_node->orig); | |
c4aac1ab | 456 | |
414254e3 ML |
457 | /* Note: We don't need a NULL check here, since curr_gw never |
458 | * gets dereferenced. | |
459 | */ | |
460 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); | |
461 | if (gw_node == curr_gw) | |
462 | batadv_gw_deselect(bat_priv); | |
463 | } | |
71e4aa9c | 464 | |
414254e3 | 465 | out: |
c4aac1ab | 466 | if (curr_gw) |
1409a834 | 467 | batadv_gw_node_free_ref(curr_gw); |
414254e3 ML |
468 | if (gw_node) |
469 | batadv_gw_node_free_ref(gw_node); | |
c6c8fea2 SE |
470 | } |
471 | ||
56303d34 SE |
472 | void batadv_gw_node_delete(struct batadv_priv *bat_priv, |
473 | struct batadv_orig_node *orig_node) | |
c6c8fea2 | 474 | { |
414254e3 ML |
475 | struct batadv_tvlv_gateway_data gateway; |
476 | ||
477 | gateway.bandwidth_down = 0; | |
478 | gateway.bandwidth_up = 0; | |
479 | ||
480 | batadv_gw_node_update(bat_priv, orig_node, &gateway); | |
c6c8fea2 SE |
481 | } |
482 | ||
56303d34 | 483 | void batadv_gw_node_purge(struct batadv_priv *bat_priv) |
c6c8fea2 | 484 | { |
56303d34 | 485 | struct batadv_gw_node *gw_node, *curr_gw; |
b67bfe0d | 486 | struct hlist_node *node_tmp; |
42d0b044 | 487 | unsigned long timeout = msecs_to_jiffies(2 * BATADV_PURGE_TIMEOUT); |
b4e17054 | 488 | int do_deselect = 0; |
c4aac1ab | 489 | |
1409a834 | 490 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
c6c8fea2 | 491 | |
807736f6 | 492 | spin_lock_bh(&bat_priv->gw.list_lock); |
c6c8fea2 | 493 | |
b67bfe0d | 494 | hlist_for_each_entry_safe(gw_node, node_tmp, |
807736f6 | 495 | &bat_priv->gw.list, list) { |
c6c8fea2 SE |
496 | if (((!gw_node->deleted) || |
497 | (time_before(jiffies, gw_node->deleted + timeout))) && | |
39c75a51 | 498 | atomic_read(&bat_priv->mesh_state) == BATADV_MESH_ACTIVE) |
c6c8fea2 SE |
499 | continue; |
500 | ||
c4aac1ab ML |
501 | if (curr_gw == gw_node) |
502 | do_deselect = 1; | |
c6c8fea2 SE |
503 | |
504 | hlist_del_rcu(&gw_node->list); | |
1409a834 | 505 | batadv_gw_node_free_ref(gw_node); |
c6c8fea2 SE |
506 | } |
507 | ||
807736f6 | 508 | spin_unlock_bh(&bat_priv->gw.list_lock); |
c4aac1ab ML |
509 | |
510 | /* gw_deselect() needs to acquire the gw_list_lock */ | |
511 | if (do_deselect) | |
7cf06bc6 | 512 | batadv_gw_deselect(bat_priv); |
c4aac1ab ML |
513 | |
514 | if (curr_gw) | |
1409a834 | 515 | batadv_gw_node_free_ref(curr_gw); |
c6c8fea2 SE |
516 | } |
517 | ||
9cfc7bd6 | 518 | /* fails if orig_node has no router */ |
56303d34 SE |
519 | static int batadv_write_buffer_text(struct batadv_priv *bat_priv, |
520 | struct seq_file *seq, | |
521 | const struct batadv_gw_node *gw_node) | |
c6c8fea2 | 522 | { |
56303d34 SE |
523 | struct batadv_gw_node *curr_gw; |
524 | struct batadv_neigh_node *router; | |
414254e3 | 525 | int ret = -1; |
c6c8fea2 | 526 | |
7d211efc | 527 | router = batadv_orig_node_get_router(gw_node->orig_node); |
e1a5382f LL |
528 | if (!router) |
529 | goto out; | |
5d02b3cd | 530 | |
1409a834 | 531 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
5d02b3cd | 532 | |
414254e3 | 533 | ret = seq_printf(seq, "%s %pM (%3i) %pM [%10s]: %u.%u/%u.%u MBit\n", |
c4aac1ab ML |
534 | (curr_gw == gw_node ? "=>" : " "), |
535 | gw_node->orig_node->orig, | |
536 | router->tq_avg, router->addr, | |
537 | router->if_incoming->net_dev->name, | |
414254e3 ML |
538 | gw_node->bandwidth_down / 10, |
539 | gw_node->bandwidth_down % 10, | |
540 | gw_node->bandwidth_up / 10, | |
541 | gw_node->bandwidth_up % 10); | |
5d02b3cd | 542 | |
7d211efc | 543 | batadv_neigh_node_free_ref(router); |
c4aac1ab | 544 | if (curr_gw) |
1409a834 | 545 | batadv_gw_node_free_ref(curr_gw); |
e1a5382f | 546 | out: |
5d02b3cd | 547 | return ret; |
c6c8fea2 SE |
548 | } |
549 | ||
7cf06bc6 | 550 | int batadv_gw_client_seq_print_text(struct seq_file *seq, void *offset) |
c6c8fea2 SE |
551 | { |
552 | struct net_device *net_dev = (struct net_device *)seq->private; | |
56303d34 SE |
553 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
554 | struct batadv_hard_iface *primary_if; | |
555 | struct batadv_gw_node *gw_node; | |
30da63a6 | 556 | int gw_count = 0; |
c6c8fea2 | 557 | |
30da63a6 ML |
558 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
559 | if (!primary_if) | |
32ae9b22 | 560 | goto out; |
c6c8fea2 | 561 | |
86ceb360 | 562 | seq_printf(seq, |
414254e3 | 563 | " %-12s (%s/%i) %17s [%10s]: advertised uplink bandwidth ... [B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s)]\n", |
42d0b044 SE |
564 | "Gateway", "#", BATADV_TQ_MAX_VALUE, "Nexthop", "outgoingIF", |
565 | BATADV_SOURCE_VERSION, primary_if->net_dev->name, | |
32ae9b22 | 566 | primary_if->net_dev->dev_addr, net_dev->name); |
c6c8fea2 SE |
567 | |
568 | rcu_read_lock(); | |
b67bfe0d | 569 | hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.list, list) { |
c6c8fea2 SE |
570 | if (gw_node->deleted) |
571 | continue; | |
572 | ||
e1a5382f | 573 | /* fails if orig_node has no router */ |
1409a834 | 574 | if (batadv_write_buffer_text(bat_priv, seq, gw_node) < 0) |
c6c8fea2 SE |
575 | continue; |
576 | ||
c6c8fea2 SE |
577 | gw_count++; |
578 | } | |
579 | rcu_read_unlock(); | |
580 | ||
581 | if (gw_count == 0) | |
0c814653 | 582 | seq_puts(seq, "No gateways in range ...\n"); |
c6c8fea2 | 583 | |
32ae9b22 ML |
584 | out: |
585 | if (primary_if) | |
e5d89254 | 586 | batadv_hardif_free_ref(primary_if); |
30da63a6 | 587 | return 0; |
c6c8fea2 SE |
588 | } |
589 | ||
9d2c9488 | 590 | /* this call might reallocate skb data */ |
1409a834 | 591 | static bool batadv_is_type_dhcprequest(struct sk_buff *skb, int header_len) |
43676ab5 AQ |
592 | { |
593 | int ret = false; | |
594 | unsigned char *p; | |
595 | int pkt_len; | |
596 | ||
597 | if (skb_linearize(skb) < 0) | |
598 | goto out; | |
599 | ||
600 | pkt_len = skb_headlen(skb); | |
601 | ||
347c80f0 | 602 | if (pkt_len < header_len + BATADV_DHCP_OPTIONS_OFFSET + 1) |
43676ab5 AQ |
603 | goto out; |
604 | ||
347c80f0 SE |
605 | p = skb->data + header_len + BATADV_DHCP_OPTIONS_OFFSET; |
606 | pkt_len -= header_len + BATADV_DHCP_OPTIONS_OFFSET + 1; | |
43676ab5 AQ |
607 | |
608 | /* Access the dhcp option lists. Each entry is made up by: | |
015758d0 AQ |
609 | * - octet 1: option type |
610 | * - octet 2: option data len (only if type != 255 and 0) | |
9cfc7bd6 SE |
611 | * - octet 3: option data |
612 | */ | |
43676ab5 | 613 | while (*p != 255 && !ret) { |
015758d0 | 614 | /* p now points to the first octet: option type */ |
43676ab5 AQ |
615 | if (*p == 53) { |
616 | /* type 53 is the message type option. | |
9cfc7bd6 SE |
617 | * Jump the len octet and go to the data octet |
618 | */ | |
43676ab5 AQ |
619 | if (pkt_len < 2) |
620 | goto out; | |
621 | p += 2; | |
622 | ||
623 | /* check if the message type is what we need */ | |
347c80f0 | 624 | if (*p == BATADV_DHCP_REQUEST) |
43676ab5 AQ |
625 | ret = true; |
626 | break; | |
627 | } else if (*p == 0) { | |
628 | /* option type 0 (padding), just go forward */ | |
629 | if (pkt_len < 1) | |
630 | goto out; | |
631 | pkt_len--; | |
632 | p++; | |
633 | } else { | |
634 | /* This is any other option. So we get the length... */ | |
635 | if (pkt_len < 1) | |
636 | goto out; | |
637 | pkt_len--; | |
638 | p++; | |
639 | ||
640 | /* ...and then we jump over the data */ | |
9205cc52 | 641 | if (pkt_len < 1 + (*p)) |
43676ab5 | 642 | goto out; |
9205cc52 AQ |
643 | pkt_len -= 1 + (*p); |
644 | p += 1 + (*p); | |
43676ab5 AQ |
645 | } |
646 | } | |
647 | out: | |
648 | return ret; | |
649 | } | |
650 | ||
9d2c9488 | 651 | /* this call might reallocate skb data */ |
7cf06bc6 | 652 | bool batadv_gw_is_dhcp_target(struct sk_buff *skb, unsigned int *header_len) |
c6c8fea2 SE |
653 | { |
654 | struct ethhdr *ethhdr; | |
655 | struct iphdr *iphdr; | |
656 | struct ipv6hdr *ipv6hdr; | |
657 | struct udphdr *udphdr; | |
f7f8ed56 AQ |
658 | struct vlan_ethhdr *vhdr; |
659 | __be16 proto; | |
c6c8fea2 SE |
660 | |
661 | /* check for ethernet header */ | |
be7af5cf ML |
662 | if (!pskb_may_pull(skb, *header_len + ETH_HLEN)) |
663 | return false; | |
c6c8fea2 | 664 | ethhdr = (struct ethhdr *)skb->data; |
f7f8ed56 | 665 | proto = ethhdr->h_proto; |
be7af5cf | 666 | *header_len += ETH_HLEN; |
c6c8fea2 SE |
667 | |
668 | /* check for initial vlan header */ | |
f7f8ed56 | 669 | if (proto == htons(ETH_P_8021Q)) { |
be7af5cf ML |
670 | if (!pskb_may_pull(skb, *header_len + VLAN_HLEN)) |
671 | return false; | |
f7f8ed56 AQ |
672 | |
673 | vhdr = (struct vlan_ethhdr *)skb->data; | |
674 | proto = vhdr->h_vlan_encapsulated_proto; | |
be7af5cf | 675 | *header_len += VLAN_HLEN; |
c6c8fea2 SE |
676 | } |
677 | ||
678 | /* check for ip header */ | |
f7f8ed56 AQ |
679 | switch (proto) { |
680 | case htons(ETH_P_IP): | |
be7af5cf ML |
681 | if (!pskb_may_pull(skb, *header_len + sizeof(*iphdr))) |
682 | return false; | |
683 | iphdr = (struct iphdr *)(skb->data + *header_len); | |
684 | *header_len += iphdr->ihl * 4; | |
c6c8fea2 SE |
685 | |
686 | /* check for udp header */ | |
687 | if (iphdr->protocol != IPPROTO_UDP) | |
be7af5cf | 688 | return false; |
c6c8fea2 SE |
689 | |
690 | break; | |
f7f8ed56 | 691 | case htons(ETH_P_IPV6): |
be7af5cf ML |
692 | if (!pskb_may_pull(skb, *header_len + sizeof(*ipv6hdr))) |
693 | return false; | |
694 | ipv6hdr = (struct ipv6hdr *)(skb->data + *header_len); | |
695 | *header_len += sizeof(*ipv6hdr); | |
c6c8fea2 SE |
696 | |
697 | /* check for udp header */ | |
698 | if (ipv6hdr->nexthdr != IPPROTO_UDP) | |
be7af5cf | 699 | return false; |
c6c8fea2 SE |
700 | |
701 | break; | |
702 | default: | |
be7af5cf | 703 | return false; |
c6c8fea2 SE |
704 | } |
705 | ||
be7af5cf ML |
706 | if (!pskb_may_pull(skb, *header_len + sizeof(*udphdr))) |
707 | return false; | |
9d2c9488 LL |
708 | |
709 | /* skb->data might have been reallocated by pskb_may_pull() */ | |
710 | ethhdr = (struct ethhdr *)skb->data; | |
711 | if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) | |
712 | ethhdr = (struct ethhdr *)(skb->data + VLAN_HLEN); | |
713 | ||
be7af5cf ML |
714 | udphdr = (struct udphdr *)(skb->data + *header_len); |
715 | *header_len += sizeof(*udphdr); | |
c6c8fea2 SE |
716 | |
717 | /* check for bootp port */ | |
f7f8ed56 | 718 | if ((proto == htons(ETH_P_IP)) && |
293e9338 | 719 | (udphdr->dest != htons(67))) |
be7af5cf | 720 | return false; |
c6c8fea2 | 721 | |
f7f8ed56 | 722 | if ((proto == htons(ETH_P_IPV6)) && |
293e9338 | 723 | (udphdr->dest != htons(547))) |
be7af5cf | 724 | return false; |
c6c8fea2 | 725 | |
be7af5cf ML |
726 | return true; |
727 | } | |
c6c8fea2 | 728 | |
9d2c9488 | 729 | /* this call might reallocate skb data */ |
56303d34 | 730 | bool batadv_gw_out_of_range(struct batadv_priv *bat_priv, |
9d2c9488 | 731 | struct sk_buff *skb) |
be7af5cf | 732 | { |
56303d34 SE |
733 | struct batadv_neigh_node *neigh_curr = NULL, *neigh_old = NULL; |
734 | struct batadv_orig_node *orig_dst_node = NULL; | |
414254e3 | 735 | struct batadv_gw_node *gw_node = NULL, *curr_gw = NULL; |
9d2c9488 | 736 | struct ethhdr *ethhdr; |
be7af5cf ML |
737 | bool ret, out_of_range = false; |
738 | unsigned int header_len = 0; | |
739 | uint8_t curr_tq_avg; | |
740 | ||
7cf06bc6 | 741 | ret = batadv_gw_is_dhcp_target(skb, &header_len); |
be7af5cf ML |
742 | if (!ret) |
743 | goto out; | |
744 | ||
9d2c9488 | 745 | ethhdr = (struct ethhdr *)skb->data; |
08c36d3e | 746 | orig_dst_node = batadv_transtable_search(bat_priv, ethhdr->h_source, |
c018ad3d AQ |
747 | ethhdr->h_dest, |
748 | BATADV_NO_FLAGS); | |
be7af5cf ML |
749 | if (!orig_dst_node) |
750 | goto out; | |
751 | ||
414254e3 ML |
752 | gw_node = batadv_gw_node_get(bat_priv, orig_dst_node); |
753 | if (!gw_node->bandwidth_down == 0) | |
be7af5cf ML |
754 | goto out; |
755 | ||
1409a834 | 756 | ret = batadv_is_type_dhcprequest(skb, header_len); |
be7af5cf ML |
757 | if (!ret) |
758 | goto out; | |
759 | ||
760 | switch (atomic_read(&bat_priv->gw_mode)) { | |
cd646ab1 | 761 | case BATADV_GW_MODE_SERVER: |
be7af5cf | 762 | /* If we are a GW then we are our best GW. We can artificially |
9cfc7bd6 SE |
763 | * set the tq towards ourself as the maximum value |
764 | */ | |
42d0b044 | 765 | curr_tq_avg = BATADV_TQ_MAX_VALUE; |
be7af5cf | 766 | break; |
cd646ab1 | 767 | case BATADV_GW_MODE_CLIENT: |
1409a834 | 768 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
be7af5cf ML |
769 | if (!curr_gw) |
770 | goto out; | |
771 | ||
772 | /* packet is going to our gateway */ | |
773 | if (curr_gw->orig_node == orig_dst_node) | |
774 | goto out; | |
775 | ||
776 | /* If the dhcp packet has been sent to a different gw, | |
777 | * we have to evaluate whether the old gw is still | |
9cfc7bd6 SE |
778 | * reliable enough |
779 | */ | |
30d3c511 SE |
780 | neigh_curr = batadv_find_router(bat_priv, curr_gw->orig_node, |
781 | NULL); | |
be7af5cf ML |
782 | if (!neigh_curr) |
783 | goto out; | |
784 | ||
785 | curr_tq_avg = neigh_curr->tq_avg; | |
786 | break; | |
cd646ab1 | 787 | case BATADV_GW_MODE_OFF: |
be7af5cf ML |
788 | default: |
789 | goto out; | |
43676ab5 | 790 | } |
be7af5cf | 791 | |
30d3c511 | 792 | neigh_old = batadv_find_router(bat_priv, orig_dst_node, NULL); |
2ef04f47 | 793 | if (!neigh_old) |
be7af5cf ML |
794 | goto out; |
795 | ||
42d0b044 | 796 | if (curr_tq_avg - neigh_old->tq_avg > BATADV_GW_THRESHOLD) |
be7af5cf ML |
797 | out_of_range = true; |
798 | ||
799 | out: | |
800 | if (orig_dst_node) | |
7d211efc | 801 | batadv_orig_node_free_ref(orig_dst_node); |
be7af5cf | 802 | if (curr_gw) |
1409a834 | 803 | batadv_gw_node_free_ref(curr_gw); |
414254e3 ML |
804 | if (gw_node) |
805 | batadv_gw_node_free_ref(gw_node); | |
43676ab5 | 806 | if (neigh_old) |
7d211efc | 807 | batadv_neigh_node_free_ref(neigh_old); |
43676ab5 | 808 | if (neigh_curr) |
7d211efc | 809 | batadv_neigh_node_free_ref(neigh_curr); |
be7af5cf | 810 | return out_of_range; |
c6c8fea2 | 811 | } |