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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 | |
cd646ab1 | 224 | if (atomic_read(&bat_priv->gw_mode) != BATADV_GW_MODE_CLIENT) |
2265c141 AQ |
225 | goto out; |
226 | ||
1409a834 | 227 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
2265c141 | 228 | |
807736f6 | 229 | if (!batadv_atomic_dec_not_zero(&bat_priv->gw.reselect) && curr_gw) |
caa0bf64 ML |
230 | goto out; |
231 | ||
1409a834 | 232 | next_gw = batadv_gw_get_best_gw_node(bat_priv); |
2265c141 AQ |
233 | |
234 | if (curr_gw == next_gw) | |
235 | goto out; | |
236 | ||
237 | if (next_gw) { | |
19595e05 AQ |
238 | sprintf(gw_addr, "%pM", next_gw->orig_node->orig); |
239 | ||
7d211efc | 240 | router = batadv_orig_node_get_router(next_gw->orig_node); |
2265c141 | 241 | if (!router) { |
7cf06bc6 | 242 | batadv_gw_deselect(bat_priv); |
2265c141 AQ |
243 | goto out; |
244 | } | |
c6c8fea2 SE |
245 | } |
246 | ||
2265c141 | 247 | if ((curr_gw) && (!next_gw)) { |
39c75a51 | 248 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 249 | "Removing selected gateway - no gateway in range\n"); |
39c75a51 SE |
250 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL, |
251 | NULL); | |
2265c141 | 252 | } else if ((!curr_gw) && (next_gw)) { |
39c75a51 | 253 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
414254e3 | 254 | "Adding route to gateway %pM (bandwidth: %u.%u/%u.%u MBit, tq: %i)\n", |
1eda58bf | 255 | next_gw->orig_node->orig, |
414254e3 ML |
256 | next_gw->bandwidth_down / 10, |
257 | next_gw->bandwidth_down % 10, | |
258 | next_gw->bandwidth_up / 10, | |
259 | next_gw->bandwidth_up % 10, router->tq_avg); | |
39c75a51 SE |
260 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_ADD, |
261 | gw_addr); | |
2265c141 | 262 | } else { |
39c75a51 | 263 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
414254e3 | 264 | "Changing route to gateway %pM (bandwidth: %u.%u/%u.%u MBit, tq: %i)\n", |
1eda58bf | 265 | next_gw->orig_node->orig, |
414254e3 ML |
266 | next_gw->bandwidth_down / 10, |
267 | next_gw->bandwidth_down % 10, | |
268 | next_gw->bandwidth_up / 10, | |
269 | next_gw->bandwidth_up % 10, router->tq_avg); | |
39c75a51 SE |
270 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_CHANGE, |
271 | gw_addr); | |
2265c141 AQ |
272 | } |
273 | ||
1409a834 | 274 | batadv_gw_select(bat_priv, next_gw); |
2265c141 | 275 | |
c4aac1ab ML |
276 | out: |
277 | if (curr_gw) | |
1409a834 | 278 | batadv_gw_node_free_ref(curr_gw); |
2265c141 | 279 | if (next_gw) |
1409a834 | 280 | batadv_gw_node_free_ref(next_gw); |
2265c141 | 281 | if (router) |
7d211efc | 282 | batadv_neigh_node_free_ref(router); |
c6c8fea2 SE |
283 | } |
284 | ||
56303d34 SE |
285 | void batadv_gw_check_election(struct batadv_priv *bat_priv, |
286 | struct batadv_orig_node *orig_node) | |
c6c8fea2 | 287 | { |
56303d34 SE |
288 | struct batadv_orig_node *curr_gw_orig; |
289 | struct batadv_neigh_node *router_gw = NULL, *router_orig = NULL; | |
c6c8fea2 SE |
290 | uint8_t gw_tq_avg, orig_tq_avg; |
291 | ||
7cf06bc6 | 292 | curr_gw_orig = batadv_gw_get_selected_orig(bat_priv); |
57f0c07c LL |
293 | if (!curr_gw_orig) |
294 | goto deselect; | |
c6c8fea2 | 295 | |
7d211efc | 296 | router_gw = batadv_orig_node_get_router(curr_gw_orig); |
e1a5382f LL |
297 | if (!router_gw) |
298 | goto deselect; | |
c6c8fea2 SE |
299 | |
300 | /* this node already is the gateway */ | |
57f0c07c | 301 | if (curr_gw_orig == orig_node) |
e1a5382f | 302 | goto out; |
c6c8fea2 | 303 | |
7d211efc | 304 | router_orig = batadv_orig_node_get_router(orig_node); |
e1a5382f LL |
305 | if (!router_orig) |
306 | goto out; | |
5d02b3cd | 307 | |
e1a5382f LL |
308 | gw_tq_avg = router_gw->tq_avg; |
309 | orig_tq_avg = router_orig->tq_avg; | |
c6c8fea2 SE |
310 | |
311 | /* the TQ value has to be better */ | |
312 | if (orig_tq_avg < gw_tq_avg) | |
5d02b3cd | 313 | goto out; |
c6c8fea2 | 314 | |
9cfc7bd6 | 315 | /* if the routing class is greater than 3 the value tells us how much |
c6c8fea2 | 316 | * greater the TQ value of the new gateway must be |
9cfc7bd6 | 317 | */ |
c6c8fea2 SE |
318 | if ((atomic_read(&bat_priv->gw_sel_class) > 3) && |
319 | (orig_tq_avg - gw_tq_avg < atomic_read(&bat_priv->gw_sel_class))) | |
5d02b3cd | 320 | goto out; |
c6c8fea2 | 321 | |
39c75a51 | 322 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
323 | "Restarting gateway selection: better gateway found (tq curr: %i, tq new: %i)\n", |
324 | gw_tq_avg, orig_tq_avg); | |
c6c8fea2 SE |
325 | |
326 | deselect: | |
7cf06bc6 | 327 | batadv_gw_deselect(bat_priv); |
5d02b3cd | 328 | out: |
57f0c07c | 329 | if (curr_gw_orig) |
7d211efc | 330 | batadv_orig_node_free_ref(curr_gw_orig); |
e1a5382f | 331 | if (router_gw) |
7d211efc | 332 | batadv_neigh_node_free_ref(router_gw); |
e1a5382f | 333 | if (router_orig) |
7d211efc | 334 | batadv_neigh_node_free_ref(router_orig); |
57f0c07c | 335 | |
5d02b3cd | 336 | return; |
c6c8fea2 SE |
337 | } |
338 | ||
414254e3 ML |
339 | /** |
340 | * batadv_gw_node_add - add gateway node to list of available gateways | |
341 | * @bat_priv: the bat priv with all the soft interface information | |
342 | * @orig_node: originator announcing gateway capabilities | |
343 | * @gateway: announced bandwidth information | |
344 | */ | |
56303d34 SE |
345 | static void batadv_gw_node_add(struct batadv_priv *bat_priv, |
346 | struct batadv_orig_node *orig_node, | |
414254e3 | 347 | struct batadv_tvlv_gateway_data *gateway) |
c6c8fea2 | 348 | { |
56303d34 | 349 | struct batadv_gw_node *gw_node; |
414254e3 ML |
350 | |
351 | if (gateway->bandwidth_down == 0) | |
352 | return; | |
c6c8fea2 | 353 | |
704509b8 | 354 | gw_node = kzalloc(sizeof(*gw_node), GFP_ATOMIC); |
c6c8fea2 SE |
355 | if (!gw_node) |
356 | return; | |
357 | ||
c6c8fea2 SE |
358 | INIT_HLIST_NODE(&gw_node->list); |
359 | gw_node->orig_node = orig_node; | |
25b6d3c1 | 360 | atomic_set(&gw_node->refcount, 1); |
c6c8fea2 | 361 | |
807736f6 SE |
362 | spin_lock_bh(&bat_priv->gw.list_lock); |
363 | hlist_add_head_rcu(&gw_node->list, &bat_priv->gw.list); | |
364 | spin_unlock_bh(&bat_priv->gw.list_lock); | |
c6c8fea2 | 365 | |
39c75a51 | 366 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
414254e3 ML |
367 | "Found new gateway %pM -> gw bandwidth: %u.%u/%u.%u MBit\n", |
368 | orig_node->orig, | |
369 | ntohl(gateway->bandwidth_down) / 10, | |
370 | ntohl(gateway->bandwidth_down) % 10, | |
371 | ntohl(gateway->bandwidth_up) / 10, | |
372 | ntohl(gateway->bandwidth_up) % 10); | |
c6c8fea2 SE |
373 | } |
374 | ||
414254e3 ML |
375 | /** |
376 | * batadv_gw_node_get - retrieve gateway node from list of available gateways | |
377 | * @bat_priv: the bat priv with all the soft interface information | |
378 | * @orig_node: originator announcing gateway capabilities | |
379 | * | |
380 | * Returns gateway node if found or NULL otherwise. | |
381 | */ | |
382 | static struct batadv_gw_node * | |
383 | batadv_gw_node_get(struct batadv_priv *bat_priv, | |
384 | struct batadv_orig_node *orig_node) | |
c6c8fea2 | 385 | { |
414254e3 | 386 | struct batadv_gw_node *gw_node_tmp, *gw_node = NULL; |
c6c8fea2 SE |
387 | |
388 | rcu_read_lock(); | |
414254e3 ML |
389 | hlist_for_each_entry_rcu(gw_node_tmp, &bat_priv->gw.list, list) { |
390 | if (gw_node_tmp->orig_node != orig_node) | |
c6c8fea2 SE |
391 | continue; |
392 | ||
414254e3 ML |
393 | if (gw_node_tmp->deleted) |
394 | continue; | |
c6c8fea2 | 395 | |
414254e3 ML |
396 | if (!atomic_inc_not_zero(&gw_node_tmp->refcount)) |
397 | continue; | |
c6c8fea2 | 398 | |
414254e3 ML |
399 | gw_node = gw_node_tmp; |
400 | break; | |
401 | } | |
402 | rcu_read_unlock(); | |
c6c8fea2 | 403 | |
414254e3 ML |
404 | return gw_node; |
405 | } | |
c6c8fea2 | 406 | |
414254e3 ML |
407 | /** |
408 | * batadv_gw_node_update - update list of available gateways with changed | |
409 | * bandwidth information | |
410 | * @bat_priv: the bat priv with all the soft interface information | |
411 | * @orig_node: originator announcing gateway capabilities | |
412 | * @gateway: announced bandwidth information | |
413 | */ | |
414 | void batadv_gw_node_update(struct batadv_priv *bat_priv, | |
415 | struct batadv_orig_node *orig_node, | |
416 | struct batadv_tvlv_gateway_data *gateway) | |
417 | { | |
418 | struct batadv_gw_node *gw_node, *curr_gw = NULL; | |
419 | ||
420 | gw_node = batadv_gw_node_get(bat_priv, orig_node); | |
421 | if (!gw_node) { | |
422 | batadv_gw_node_add(bat_priv, orig_node, gateway); | |
423 | goto out; | |
c6c8fea2 | 424 | } |
c6c8fea2 | 425 | |
414254e3 ML |
426 | if ((gw_node->bandwidth_down == ntohl(gateway->bandwidth_down)) && |
427 | (gw_node->bandwidth_up == ntohl(gateway->bandwidth_up))) | |
428 | goto out; | |
c6c8fea2 | 429 | |
414254e3 ML |
430 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
431 | "Gateway bandwidth of originator %pM changed from %u.%u/%u.%u MBit to %u.%u/%u.%u MBit\n", | |
432 | orig_node->orig, | |
433 | gw_node->bandwidth_down / 10, | |
434 | gw_node->bandwidth_down % 10, | |
435 | gw_node->bandwidth_up / 10, | |
436 | gw_node->bandwidth_up % 10, | |
437 | ntohl(gateway->bandwidth_down) / 10, | |
438 | ntohl(gateway->bandwidth_down) % 10, | |
439 | ntohl(gateway->bandwidth_up) / 10, | |
440 | ntohl(gateway->bandwidth_up) % 10); | |
441 | ||
442 | gw_node->bandwidth_down = ntohl(gateway->bandwidth_down); | |
443 | gw_node->bandwidth_up = ntohl(gateway->bandwidth_up); | |
444 | ||
445 | gw_node->deleted = 0; | |
446 | if (ntohl(gateway->bandwidth_down) == 0) { | |
447 | gw_node->deleted = jiffies; | |
448 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
449 | "Gateway %pM removed from gateway list\n", | |
450 | orig_node->orig); | |
c4aac1ab | 451 | |
414254e3 ML |
452 | /* Note: We don't need a NULL check here, since curr_gw never |
453 | * gets dereferenced. | |
454 | */ | |
455 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); | |
456 | if (gw_node == curr_gw) | |
457 | batadv_gw_deselect(bat_priv); | |
458 | } | |
71e4aa9c | 459 | |
414254e3 | 460 | out: |
c4aac1ab | 461 | if (curr_gw) |
1409a834 | 462 | batadv_gw_node_free_ref(curr_gw); |
414254e3 ML |
463 | if (gw_node) |
464 | batadv_gw_node_free_ref(gw_node); | |
c6c8fea2 SE |
465 | } |
466 | ||
56303d34 SE |
467 | void batadv_gw_node_delete(struct batadv_priv *bat_priv, |
468 | struct batadv_orig_node *orig_node) | |
c6c8fea2 | 469 | { |
414254e3 ML |
470 | struct batadv_tvlv_gateway_data gateway; |
471 | ||
472 | gateway.bandwidth_down = 0; | |
473 | gateway.bandwidth_up = 0; | |
474 | ||
475 | batadv_gw_node_update(bat_priv, orig_node, &gateway); | |
c6c8fea2 SE |
476 | } |
477 | ||
56303d34 | 478 | void batadv_gw_node_purge(struct batadv_priv *bat_priv) |
c6c8fea2 | 479 | { |
56303d34 | 480 | struct batadv_gw_node *gw_node, *curr_gw; |
b67bfe0d | 481 | struct hlist_node *node_tmp; |
42d0b044 | 482 | unsigned long timeout = msecs_to_jiffies(2 * BATADV_PURGE_TIMEOUT); |
b4e17054 | 483 | int do_deselect = 0; |
c4aac1ab | 484 | |
1409a834 | 485 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
c6c8fea2 | 486 | |
807736f6 | 487 | spin_lock_bh(&bat_priv->gw.list_lock); |
c6c8fea2 | 488 | |
b67bfe0d | 489 | hlist_for_each_entry_safe(gw_node, node_tmp, |
807736f6 | 490 | &bat_priv->gw.list, list) { |
c6c8fea2 SE |
491 | if (((!gw_node->deleted) || |
492 | (time_before(jiffies, gw_node->deleted + timeout))) && | |
39c75a51 | 493 | atomic_read(&bat_priv->mesh_state) == BATADV_MESH_ACTIVE) |
c6c8fea2 SE |
494 | continue; |
495 | ||
c4aac1ab ML |
496 | if (curr_gw == gw_node) |
497 | do_deselect = 1; | |
c6c8fea2 SE |
498 | |
499 | hlist_del_rcu(&gw_node->list); | |
1409a834 | 500 | batadv_gw_node_free_ref(gw_node); |
c6c8fea2 SE |
501 | } |
502 | ||
807736f6 | 503 | spin_unlock_bh(&bat_priv->gw.list_lock); |
c4aac1ab ML |
504 | |
505 | /* gw_deselect() needs to acquire the gw_list_lock */ | |
506 | if (do_deselect) | |
7cf06bc6 | 507 | batadv_gw_deselect(bat_priv); |
c4aac1ab ML |
508 | |
509 | if (curr_gw) | |
1409a834 | 510 | batadv_gw_node_free_ref(curr_gw); |
c6c8fea2 SE |
511 | } |
512 | ||
9cfc7bd6 | 513 | /* fails if orig_node has no router */ |
56303d34 SE |
514 | static int batadv_write_buffer_text(struct batadv_priv *bat_priv, |
515 | struct seq_file *seq, | |
516 | const struct batadv_gw_node *gw_node) | |
c6c8fea2 | 517 | { |
56303d34 SE |
518 | struct batadv_gw_node *curr_gw; |
519 | struct batadv_neigh_node *router; | |
414254e3 | 520 | int ret = -1; |
c6c8fea2 | 521 | |
7d211efc | 522 | router = batadv_orig_node_get_router(gw_node->orig_node); |
e1a5382f LL |
523 | if (!router) |
524 | goto out; | |
5d02b3cd | 525 | |
1409a834 | 526 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
5d02b3cd | 527 | |
414254e3 | 528 | ret = seq_printf(seq, "%s %pM (%3i) %pM [%10s]: %u.%u/%u.%u MBit\n", |
c4aac1ab ML |
529 | (curr_gw == gw_node ? "=>" : " "), |
530 | gw_node->orig_node->orig, | |
531 | router->tq_avg, router->addr, | |
532 | router->if_incoming->net_dev->name, | |
414254e3 ML |
533 | gw_node->bandwidth_down / 10, |
534 | gw_node->bandwidth_down % 10, | |
535 | gw_node->bandwidth_up / 10, | |
536 | gw_node->bandwidth_up % 10); | |
5d02b3cd | 537 | |
7d211efc | 538 | batadv_neigh_node_free_ref(router); |
c4aac1ab | 539 | if (curr_gw) |
1409a834 | 540 | batadv_gw_node_free_ref(curr_gw); |
e1a5382f | 541 | out: |
5d02b3cd | 542 | return ret; |
c6c8fea2 SE |
543 | } |
544 | ||
7cf06bc6 | 545 | int batadv_gw_client_seq_print_text(struct seq_file *seq, void *offset) |
c6c8fea2 SE |
546 | { |
547 | struct net_device *net_dev = (struct net_device *)seq->private; | |
56303d34 SE |
548 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
549 | struct batadv_hard_iface *primary_if; | |
550 | struct batadv_gw_node *gw_node; | |
30da63a6 | 551 | int gw_count = 0; |
c6c8fea2 | 552 | |
30da63a6 ML |
553 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
554 | if (!primary_if) | |
32ae9b22 | 555 | goto out; |
c6c8fea2 | 556 | |
86ceb360 | 557 | seq_printf(seq, |
414254e3 | 558 | " %-12s (%s/%i) %17s [%10s]: advertised uplink bandwidth ... [B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s)]\n", |
42d0b044 SE |
559 | "Gateway", "#", BATADV_TQ_MAX_VALUE, "Nexthop", "outgoingIF", |
560 | BATADV_SOURCE_VERSION, primary_if->net_dev->name, | |
32ae9b22 | 561 | primary_if->net_dev->dev_addr, net_dev->name); |
c6c8fea2 SE |
562 | |
563 | rcu_read_lock(); | |
b67bfe0d | 564 | hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.list, list) { |
c6c8fea2 SE |
565 | if (gw_node->deleted) |
566 | continue; | |
567 | ||
e1a5382f | 568 | /* fails if orig_node has no router */ |
1409a834 | 569 | if (batadv_write_buffer_text(bat_priv, seq, gw_node) < 0) |
c6c8fea2 SE |
570 | continue; |
571 | ||
c6c8fea2 SE |
572 | gw_count++; |
573 | } | |
574 | rcu_read_unlock(); | |
575 | ||
576 | if (gw_count == 0) | |
0c814653 | 577 | seq_puts(seq, "No gateways in range ...\n"); |
c6c8fea2 | 578 | |
32ae9b22 ML |
579 | out: |
580 | if (primary_if) | |
e5d89254 | 581 | batadv_hardif_free_ref(primary_if); |
30da63a6 | 582 | return 0; |
c6c8fea2 SE |
583 | } |
584 | ||
9d2c9488 | 585 | /* this call might reallocate skb data */ |
1409a834 | 586 | static bool batadv_is_type_dhcprequest(struct sk_buff *skb, int header_len) |
43676ab5 AQ |
587 | { |
588 | int ret = false; | |
589 | unsigned char *p; | |
590 | int pkt_len; | |
591 | ||
592 | if (skb_linearize(skb) < 0) | |
593 | goto out; | |
594 | ||
595 | pkt_len = skb_headlen(skb); | |
596 | ||
347c80f0 | 597 | if (pkt_len < header_len + BATADV_DHCP_OPTIONS_OFFSET + 1) |
43676ab5 AQ |
598 | goto out; |
599 | ||
347c80f0 SE |
600 | p = skb->data + header_len + BATADV_DHCP_OPTIONS_OFFSET; |
601 | pkt_len -= header_len + BATADV_DHCP_OPTIONS_OFFSET + 1; | |
43676ab5 AQ |
602 | |
603 | /* Access the dhcp option lists. Each entry is made up by: | |
015758d0 AQ |
604 | * - octet 1: option type |
605 | * - octet 2: option data len (only if type != 255 and 0) | |
9cfc7bd6 SE |
606 | * - octet 3: option data |
607 | */ | |
43676ab5 | 608 | while (*p != 255 && !ret) { |
015758d0 | 609 | /* p now points to the first octet: option type */ |
43676ab5 AQ |
610 | if (*p == 53) { |
611 | /* type 53 is the message type option. | |
9cfc7bd6 SE |
612 | * Jump the len octet and go to the data octet |
613 | */ | |
43676ab5 AQ |
614 | if (pkt_len < 2) |
615 | goto out; | |
616 | p += 2; | |
617 | ||
618 | /* check if the message type is what we need */ | |
347c80f0 | 619 | if (*p == BATADV_DHCP_REQUEST) |
43676ab5 AQ |
620 | ret = true; |
621 | break; | |
622 | } else if (*p == 0) { | |
623 | /* option type 0 (padding), just go forward */ | |
624 | if (pkt_len < 1) | |
625 | goto out; | |
626 | pkt_len--; | |
627 | p++; | |
628 | } else { | |
629 | /* This is any other option. So we get the length... */ | |
630 | if (pkt_len < 1) | |
631 | goto out; | |
632 | pkt_len--; | |
633 | p++; | |
634 | ||
635 | /* ...and then we jump over the data */ | |
9205cc52 | 636 | if (pkt_len < 1 + (*p)) |
43676ab5 | 637 | goto out; |
9205cc52 AQ |
638 | pkt_len -= 1 + (*p); |
639 | p += 1 + (*p); | |
43676ab5 AQ |
640 | } |
641 | } | |
642 | out: | |
643 | return ret; | |
644 | } | |
645 | ||
9d2c9488 | 646 | /* this call might reallocate skb data */ |
7cf06bc6 | 647 | bool batadv_gw_is_dhcp_target(struct sk_buff *skb, unsigned int *header_len) |
c6c8fea2 SE |
648 | { |
649 | struct ethhdr *ethhdr; | |
650 | struct iphdr *iphdr; | |
651 | struct ipv6hdr *ipv6hdr; | |
652 | struct udphdr *udphdr; | |
f7f8ed56 AQ |
653 | struct vlan_ethhdr *vhdr; |
654 | __be16 proto; | |
c6c8fea2 SE |
655 | |
656 | /* check for ethernet header */ | |
be7af5cf ML |
657 | if (!pskb_may_pull(skb, *header_len + ETH_HLEN)) |
658 | return false; | |
c6c8fea2 | 659 | ethhdr = (struct ethhdr *)skb->data; |
f7f8ed56 | 660 | proto = ethhdr->h_proto; |
be7af5cf | 661 | *header_len += ETH_HLEN; |
c6c8fea2 SE |
662 | |
663 | /* check for initial vlan header */ | |
f7f8ed56 | 664 | if (proto == htons(ETH_P_8021Q)) { |
be7af5cf ML |
665 | if (!pskb_may_pull(skb, *header_len + VLAN_HLEN)) |
666 | return false; | |
f7f8ed56 AQ |
667 | |
668 | vhdr = (struct vlan_ethhdr *)skb->data; | |
669 | proto = vhdr->h_vlan_encapsulated_proto; | |
be7af5cf | 670 | *header_len += VLAN_HLEN; |
c6c8fea2 SE |
671 | } |
672 | ||
673 | /* check for ip header */ | |
f7f8ed56 AQ |
674 | switch (proto) { |
675 | case htons(ETH_P_IP): | |
be7af5cf ML |
676 | if (!pskb_may_pull(skb, *header_len + sizeof(*iphdr))) |
677 | return false; | |
678 | iphdr = (struct iphdr *)(skb->data + *header_len); | |
679 | *header_len += iphdr->ihl * 4; | |
c6c8fea2 SE |
680 | |
681 | /* check for udp header */ | |
682 | if (iphdr->protocol != IPPROTO_UDP) | |
be7af5cf | 683 | return false; |
c6c8fea2 SE |
684 | |
685 | break; | |
f7f8ed56 | 686 | case htons(ETH_P_IPV6): |
be7af5cf ML |
687 | if (!pskb_may_pull(skb, *header_len + sizeof(*ipv6hdr))) |
688 | return false; | |
689 | ipv6hdr = (struct ipv6hdr *)(skb->data + *header_len); | |
690 | *header_len += sizeof(*ipv6hdr); | |
c6c8fea2 SE |
691 | |
692 | /* check for udp header */ | |
693 | if (ipv6hdr->nexthdr != IPPROTO_UDP) | |
be7af5cf | 694 | return false; |
c6c8fea2 SE |
695 | |
696 | break; | |
697 | default: | |
be7af5cf | 698 | return false; |
c6c8fea2 SE |
699 | } |
700 | ||
be7af5cf ML |
701 | if (!pskb_may_pull(skb, *header_len + sizeof(*udphdr))) |
702 | return false; | |
9d2c9488 LL |
703 | |
704 | /* skb->data might have been reallocated by pskb_may_pull() */ | |
705 | ethhdr = (struct ethhdr *)skb->data; | |
706 | if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) | |
707 | ethhdr = (struct ethhdr *)(skb->data + VLAN_HLEN); | |
708 | ||
be7af5cf ML |
709 | udphdr = (struct udphdr *)(skb->data + *header_len); |
710 | *header_len += sizeof(*udphdr); | |
c6c8fea2 SE |
711 | |
712 | /* check for bootp port */ | |
f7f8ed56 | 713 | if ((proto == htons(ETH_P_IP)) && |
293e9338 | 714 | (udphdr->dest != htons(67))) |
be7af5cf | 715 | return false; |
c6c8fea2 | 716 | |
f7f8ed56 | 717 | if ((proto == htons(ETH_P_IPV6)) && |
293e9338 | 718 | (udphdr->dest != htons(547))) |
be7af5cf | 719 | return false; |
c6c8fea2 | 720 | |
be7af5cf ML |
721 | return true; |
722 | } | |
c6c8fea2 | 723 | |
bbb877ed AQ |
724 | /** |
725 | * batadv_gw_out_of_range - check if the dhcp request destination is the best gw | |
726 | * @bat_priv: the bat priv with all the soft interface information | |
727 | * @skb: the outgoing packet | |
728 | * | |
729 | * Check if the skb is a DHCP request and if it is sent to the current best GW | |
730 | * server. Due to topology changes it may be the case that the GW server | |
731 | * previously selected is not the best one anymore. | |
732 | * | |
733 | * Returns true if the packet destination is unicast and it is not the best gw, | |
734 | * false otherwise. | |
735 | * | |
736 | * This call might reallocate skb data. | |
737 | */ | |
56303d34 | 738 | bool batadv_gw_out_of_range(struct batadv_priv *bat_priv, |
9d2c9488 | 739 | struct sk_buff *skb) |
be7af5cf | 740 | { |
56303d34 SE |
741 | struct batadv_neigh_node *neigh_curr = NULL, *neigh_old = NULL; |
742 | struct batadv_orig_node *orig_dst_node = NULL; | |
414254e3 | 743 | struct batadv_gw_node *gw_node = NULL, *curr_gw = NULL; |
9d2c9488 | 744 | struct ethhdr *ethhdr; |
be7af5cf ML |
745 | bool ret, out_of_range = false; |
746 | unsigned int header_len = 0; | |
747 | uint8_t curr_tq_avg; | |
bbb877ed AQ |
748 | unsigned short vid; |
749 | ||
750 | vid = batadv_get_vid(skb, 0); | |
be7af5cf | 751 | |
7cf06bc6 | 752 | ret = batadv_gw_is_dhcp_target(skb, &header_len); |
be7af5cf ML |
753 | if (!ret) |
754 | goto out; | |
755 | ||
9d2c9488 | 756 | ethhdr = (struct ethhdr *)skb->data; |
08c36d3e | 757 | orig_dst_node = batadv_transtable_search(bat_priv, ethhdr->h_source, |
bbb877ed | 758 | ethhdr->h_dest, vid); |
be7af5cf ML |
759 | if (!orig_dst_node) |
760 | goto out; | |
761 | ||
414254e3 ML |
762 | gw_node = batadv_gw_node_get(bat_priv, orig_dst_node); |
763 | if (!gw_node->bandwidth_down == 0) | |
be7af5cf ML |
764 | goto out; |
765 | ||
1409a834 | 766 | ret = batadv_is_type_dhcprequest(skb, header_len); |
be7af5cf ML |
767 | if (!ret) |
768 | goto out; | |
769 | ||
770 | switch (atomic_read(&bat_priv->gw_mode)) { | |
cd646ab1 | 771 | case BATADV_GW_MODE_SERVER: |
be7af5cf | 772 | /* If we are a GW then we are our best GW. We can artificially |
9cfc7bd6 SE |
773 | * set the tq towards ourself as the maximum value |
774 | */ | |
42d0b044 | 775 | curr_tq_avg = BATADV_TQ_MAX_VALUE; |
be7af5cf | 776 | break; |
cd646ab1 | 777 | case BATADV_GW_MODE_CLIENT: |
1409a834 | 778 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
be7af5cf ML |
779 | if (!curr_gw) |
780 | goto out; | |
781 | ||
782 | /* packet is going to our gateway */ | |
783 | if (curr_gw->orig_node == orig_dst_node) | |
784 | goto out; | |
785 | ||
786 | /* If the dhcp packet has been sent to a different gw, | |
787 | * we have to evaluate whether the old gw is still | |
9cfc7bd6 SE |
788 | * reliable enough |
789 | */ | |
30d3c511 SE |
790 | neigh_curr = batadv_find_router(bat_priv, curr_gw->orig_node, |
791 | NULL); | |
be7af5cf ML |
792 | if (!neigh_curr) |
793 | goto out; | |
794 | ||
795 | curr_tq_avg = neigh_curr->tq_avg; | |
796 | break; | |
cd646ab1 | 797 | case BATADV_GW_MODE_OFF: |
be7af5cf ML |
798 | default: |
799 | goto out; | |
43676ab5 | 800 | } |
be7af5cf | 801 | |
30d3c511 | 802 | neigh_old = batadv_find_router(bat_priv, orig_dst_node, NULL); |
2ef04f47 | 803 | if (!neigh_old) |
be7af5cf ML |
804 | goto out; |
805 | ||
42d0b044 | 806 | if (curr_tq_avg - neigh_old->tq_avg > BATADV_GW_THRESHOLD) |
be7af5cf ML |
807 | out_of_range = true; |
808 | ||
809 | out: | |
810 | if (orig_dst_node) | |
7d211efc | 811 | batadv_orig_node_free_ref(orig_dst_node); |
be7af5cf | 812 | if (curr_gw) |
1409a834 | 813 | batadv_gw_node_free_ref(curr_gw); |
414254e3 ML |
814 | if (gw_node) |
815 | batadv_gw_node_free_ref(gw_node); | |
43676ab5 | 816 | if (neigh_old) |
7d211efc | 817 | batadv_neigh_node_free_ref(neigh_old); |
43676ab5 | 818 | if (neigh_curr) |
7d211efc | 819 | batadv_neigh_node_free_ref(neigh_curr); |
be7af5cf | 820 | return out_of_range; |
c6c8fea2 | 821 | } |