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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" | |
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(); |
c4aac1ab ML |
51 | gw_node = rcu_dereference(bat_priv->curr_gw); |
52 | if (!gw_node) | |
7b36e8ee | 53 | goto out; |
c6c8fea2 | 54 | |
c4aac1ab ML |
55 | if (!atomic_inc_not_zero(&gw_node->refcount)) |
56 | gw_node = NULL; | |
43c70ad5 | 57 | |
5d02b3cd LL |
58 | out: |
59 | rcu_read_unlock(); | |
c4aac1ab | 60 | return gw_node; |
c6c8fea2 SE |
61 | } |
62 | ||
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 | |
c4aac1ab ML |
94 | spin_lock_bh(&bat_priv->gw_list_lock); |
95 | ||
25b6d3c1 ML |
96 | if (new_gw_node && !atomic_inc_not_zero(&new_gw_node->refcount)) |
97 | new_gw_node = NULL; | |
c6c8fea2 | 98 | |
728cbc6a | 99 | curr_gw_node = rcu_dereference_protected(bat_priv->curr_gw, 1); |
5d02b3cd | 100 | rcu_assign_pointer(bat_priv->curr_gw, new_gw_node); |
25b6d3c1 ML |
101 | |
102 | if (curr_gw_node) | |
1409a834 | 103 | batadv_gw_node_free_ref(curr_gw_node); |
c4aac1ab ML |
104 | |
105 | spin_unlock_bh(&bat_priv->gw_list_lock); | |
106 | } | |
107 | ||
56303d34 | 108 | void batadv_gw_deselect(struct batadv_priv *bat_priv) |
c4aac1ab | 109 | { |
2265c141 | 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; |
2265c141 | 117 | struct hlist_node *node; |
56303d34 | 118 | struct batadv_gw_node *gw_node, *curr_gw = NULL; |
c6c8fea2 | 119 | uint32_t max_gw_factor = 0, tmp_gw_factor = 0; |
2265c141 | 120 | uint8_t max_tq = 0; |
c6c8fea2 | 121 | int down, up; |
56303d34 | 122 | struct batadv_orig_node *orig_node; |
c6c8fea2 | 123 | |
c4aac1ab | 124 | rcu_read_lock(); |
c6c8fea2 | 125 | hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) { |
e1a5382f | 126 | if (gw_node->deleted) |
c6c8fea2 SE |
127 | continue; |
128 | ||
84d5e5e0 | 129 | orig_node = gw_node->orig_node; |
7d211efc | 130 | router = batadv_orig_node_get_router(orig_node); |
e1a5382f | 131 | if (!router) |
c6c8fea2 SE |
132 | continue; |
133 | ||
2265c141 AQ |
134 | if (!atomic_inc_not_zero(&gw_node->refcount)) |
135 | goto next; | |
136 | ||
c6c8fea2 SE |
137 | switch (atomic_read(&bat_priv->gw_sel_class)) { |
138 | case 1: /* fast connection */ | |
84d5e5e0 SE |
139 | batadv_gw_bandwidth_to_kbit(orig_node->gw_flags, |
140 | &down, &up); | |
c6c8fea2 | 141 | |
e1a5382f | 142 | tmp_gw_factor = (router->tq_avg * router->tq_avg * |
c6c8fea2 | 143 | down * 100 * 100) / |
42d0b044 SE |
144 | (BATADV_TQ_LOCAL_WINDOW_SIZE * |
145 | BATADV_TQ_LOCAL_WINDOW_SIZE * 64); | |
c6c8fea2 SE |
146 | |
147 | if ((tmp_gw_factor > max_gw_factor) || | |
148 | ((tmp_gw_factor == max_gw_factor) && | |
2265c141 AQ |
149 | (router->tq_avg > max_tq))) { |
150 | if (curr_gw) | |
1409a834 | 151 | batadv_gw_node_free_ref(curr_gw); |
2265c141 AQ |
152 | curr_gw = gw_node; |
153 | atomic_inc(&curr_gw->refcount); | |
154 | } | |
c6c8fea2 SE |
155 | break; |
156 | ||
9cfc7bd6 | 157 | default: /* 2: stable connection (use best statistic) |
c6c8fea2 SE |
158 | * 3: fast-switch (use best statistic but change as |
159 | * soon as a better gateway appears) | |
160 | * XX: late-switch (use best statistic but change as | |
161 | * soon as a better gateway appears which has | |
162 | * $routing_class more tq points) | |
9cfc7bd6 | 163 | */ |
2265c141 AQ |
164 | if (router->tq_avg > max_tq) { |
165 | if (curr_gw) | |
1409a834 | 166 | batadv_gw_node_free_ref(curr_gw); |
2265c141 AQ |
167 | curr_gw = gw_node; |
168 | atomic_inc(&curr_gw->refcount); | |
169 | } | |
c6c8fea2 SE |
170 | break; |
171 | } | |
172 | ||
e1a5382f LL |
173 | if (router->tq_avg > max_tq) |
174 | max_tq = router->tq_avg; | |
c6c8fea2 SE |
175 | |
176 | if (tmp_gw_factor > max_gw_factor) | |
177 | max_gw_factor = tmp_gw_factor; | |
e1a5382f | 178 | |
1409a834 | 179 | batadv_gw_node_free_ref(gw_node); |
2265c141 AQ |
180 | |
181 | next: | |
7d211efc | 182 | batadv_neigh_node_free_ref(router); |
c6c8fea2 | 183 | } |
2265c141 | 184 | rcu_read_unlock(); |
c6c8fea2 | 185 | |
2265c141 AQ |
186 | return curr_gw; |
187 | } | |
c6c8fea2 | 188 | |
56303d34 | 189 | void batadv_gw_election(struct batadv_priv *bat_priv) |
2265c141 | 190 | { |
56303d34 SE |
191 | struct batadv_gw_node *curr_gw = NULL, *next_gw = NULL; |
192 | struct batadv_neigh_node *router = NULL; | |
19595e05 | 193 | char gw_addr[18] = { '\0' }; |
2265c141 | 194 | |
9cfc7bd6 | 195 | /* The batman daemon checks here if we already passed a full originator |
2265c141 AQ |
196 | * cycle in order to make sure we don't choose the first gateway we |
197 | * hear about. This check is based on the daemon's uptime which we | |
198 | * don't have. | |
9cfc7bd6 | 199 | */ |
cd646ab1 | 200 | if (atomic_read(&bat_priv->gw_mode) != BATADV_GW_MODE_CLIENT) |
2265c141 AQ |
201 | goto out; |
202 | ||
3e34819e | 203 | if (!batadv_atomic_dec_not_zero(&bat_priv->gw_reselect)) |
2265c141 AQ |
204 | goto out; |
205 | ||
1409a834 | 206 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
2265c141 | 207 | |
1409a834 | 208 | next_gw = batadv_gw_get_best_gw_node(bat_priv); |
2265c141 AQ |
209 | |
210 | if (curr_gw == next_gw) | |
211 | goto out; | |
212 | ||
213 | if (next_gw) { | |
19595e05 AQ |
214 | sprintf(gw_addr, "%pM", next_gw->orig_node->orig); |
215 | ||
7d211efc | 216 | router = batadv_orig_node_get_router(next_gw->orig_node); |
2265c141 | 217 | if (!router) { |
7cf06bc6 | 218 | batadv_gw_deselect(bat_priv); |
2265c141 AQ |
219 | goto out; |
220 | } | |
c6c8fea2 SE |
221 | } |
222 | ||
2265c141 | 223 | if ((curr_gw) && (!next_gw)) { |
39c75a51 | 224 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 225 | "Removing selected gateway - no gateway in range\n"); |
39c75a51 SE |
226 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL, |
227 | NULL); | |
2265c141 | 228 | } else if ((!curr_gw) && (next_gw)) { |
39c75a51 | 229 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
230 | "Adding route to gateway %pM (gw_flags: %i, tq: %i)\n", |
231 | next_gw->orig_node->orig, | |
232 | next_gw->orig_node->gw_flags, router->tq_avg); | |
39c75a51 SE |
233 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_ADD, |
234 | gw_addr); | |
2265c141 | 235 | } else { |
39c75a51 | 236 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
237 | "Changing route to gateway %pM (gw_flags: %i, tq: %i)\n", |
238 | next_gw->orig_node->orig, | |
239 | next_gw->orig_node->gw_flags, router->tq_avg); | |
39c75a51 SE |
240 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_CHANGE, |
241 | gw_addr); | |
2265c141 AQ |
242 | } |
243 | ||
1409a834 | 244 | batadv_gw_select(bat_priv, next_gw); |
2265c141 | 245 | |
c4aac1ab ML |
246 | out: |
247 | if (curr_gw) | |
1409a834 | 248 | batadv_gw_node_free_ref(curr_gw); |
2265c141 | 249 | if (next_gw) |
1409a834 | 250 | batadv_gw_node_free_ref(next_gw); |
2265c141 | 251 | if (router) |
7d211efc | 252 | batadv_neigh_node_free_ref(router); |
c6c8fea2 SE |
253 | } |
254 | ||
56303d34 SE |
255 | void batadv_gw_check_election(struct batadv_priv *bat_priv, |
256 | struct batadv_orig_node *orig_node) | |
c6c8fea2 | 257 | { |
56303d34 SE |
258 | struct batadv_orig_node *curr_gw_orig; |
259 | struct batadv_neigh_node *router_gw = NULL, *router_orig = NULL; | |
c6c8fea2 SE |
260 | uint8_t gw_tq_avg, orig_tq_avg; |
261 | ||
7cf06bc6 | 262 | curr_gw_orig = batadv_gw_get_selected_orig(bat_priv); |
57f0c07c LL |
263 | if (!curr_gw_orig) |
264 | goto deselect; | |
c6c8fea2 | 265 | |
7d211efc | 266 | router_gw = batadv_orig_node_get_router(curr_gw_orig); |
e1a5382f LL |
267 | if (!router_gw) |
268 | goto deselect; | |
c6c8fea2 SE |
269 | |
270 | /* this node already is the gateway */ | |
57f0c07c | 271 | if (curr_gw_orig == orig_node) |
e1a5382f | 272 | goto out; |
c6c8fea2 | 273 | |
7d211efc | 274 | router_orig = batadv_orig_node_get_router(orig_node); |
e1a5382f LL |
275 | if (!router_orig) |
276 | goto out; | |
5d02b3cd | 277 | |
e1a5382f LL |
278 | gw_tq_avg = router_gw->tq_avg; |
279 | orig_tq_avg = router_orig->tq_avg; | |
c6c8fea2 SE |
280 | |
281 | /* the TQ value has to be better */ | |
282 | if (orig_tq_avg < gw_tq_avg) | |
5d02b3cd | 283 | goto out; |
c6c8fea2 | 284 | |
9cfc7bd6 | 285 | /* if the routing class is greater than 3 the value tells us how much |
c6c8fea2 | 286 | * greater the TQ value of the new gateway must be |
9cfc7bd6 | 287 | */ |
c6c8fea2 SE |
288 | if ((atomic_read(&bat_priv->gw_sel_class) > 3) && |
289 | (orig_tq_avg - gw_tq_avg < atomic_read(&bat_priv->gw_sel_class))) | |
5d02b3cd | 290 | goto out; |
c6c8fea2 | 291 | |
39c75a51 | 292 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
293 | "Restarting gateway selection: better gateway found (tq curr: %i, tq new: %i)\n", |
294 | gw_tq_avg, orig_tq_avg); | |
c6c8fea2 SE |
295 | |
296 | deselect: | |
7cf06bc6 | 297 | batadv_gw_deselect(bat_priv); |
5d02b3cd | 298 | out: |
57f0c07c | 299 | if (curr_gw_orig) |
7d211efc | 300 | batadv_orig_node_free_ref(curr_gw_orig); |
e1a5382f | 301 | if (router_gw) |
7d211efc | 302 | batadv_neigh_node_free_ref(router_gw); |
e1a5382f | 303 | if (router_orig) |
7d211efc | 304 | batadv_neigh_node_free_ref(router_orig); |
57f0c07c | 305 | |
5d02b3cd | 306 | return; |
c6c8fea2 SE |
307 | } |
308 | ||
56303d34 SE |
309 | static void batadv_gw_node_add(struct batadv_priv *bat_priv, |
310 | struct batadv_orig_node *orig_node, | |
1409a834 | 311 | uint8_t new_gwflags) |
c6c8fea2 | 312 | { |
56303d34 | 313 | struct batadv_gw_node *gw_node; |
c6c8fea2 SE |
314 | int down, up; |
315 | ||
704509b8 | 316 | gw_node = kzalloc(sizeof(*gw_node), GFP_ATOMIC); |
c6c8fea2 SE |
317 | if (!gw_node) |
318 | return; | |
319 | ||
c6c8fea2 SE |
320 | INIT_HLIST_NODE(&gw_node->list); |
321 | gw_node->orig_node = orig_node; | |
25b6d3c1 | 322 | atomic_set(&gw_node->refcount, 1); |
c6c8fea2 SE |
323 | |
324 | spin_lock_bh(&bat_priv->gw_list_lock); | |
325 | hlist_add_head_rcu(&gw_node->list, &bat_priv->gw_list); | |
326 | spin_unlock_bh(&bat_priv->gw_list_lock); | |
327 | ||
84d5e5e0 | 328 | batadv_gw_bandwidth_to_kbit(new_gwflags, &down, &up); |
39c75a51 | 329 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
330 | "Found new gateway %pM -> gw_class: %i - %i%s/%i%s\n", |
331 | orig_node->orig, new_gwflags, | |
332 | (down > 2048 ? down / 1024 : down), | |
333 | (down > 2048 ? "MBit" : "KBit"), | |
334 | (up > 2048 ? up / 1024 : up), | |
335 | (up > 2048 ? "MBit" : "KBit")); | |
c6c8fea2 SE |
336 | } |
337 | ||
56303d34 SE |
338 | void batadv_gw_node_update(struct batadv_priv *bat_priv, |
339 | struct batadv_orig_node *orig_node, | |
340 | uint8_t new_gwflags) | |
c6c8fea2 SE |
341 | { |
342 | struct hlist_node *node; | |
56303d34 | 343 | struct batadv_gw_node *gw_node, *curr_gw; |
c4aac1ab | 344 | |
9cfc7bd6 | 345 | /* Note: We don't need a NULL check here, since curr_gw never gets |
71e4aa9c AQ |
346 | * dereferenced. If curr_gw is NULL we also should not exit as we may |
347 | * have this gateway in our list (duplication check!) even though we | |
348 | * have no currently selected gateway. | |
349 | */ | |
1409a834 | 350 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
c6c8fea2 SE |
351 | |
352 | rcu_read_lock(); | |
353 | hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) { | |
354 | if (gw_node->orig_node != orig_node) | |
355 | continue; | |
356 | ||
39c75a51 | 357 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
358 | "Gateway class of originator %pM changed from %i to %i\n", |
359 | orig_node->orig, gw_node->orig_node->gw_flags, | |
360 | new_gwflags); | |
c6c8fea2 SE |
361 | |
362 | gw_node->deleted = 0; | |
363 | ||
42d0b044 | 364 | if (new_gwflags == BATADV_NO_FLAGS) { |
c6c8fea2 | 365 | gw_node->deleted = jiffies; |
39c75a51 | 366 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
367 | "Gateway %pM removed from gateway list\n", |
368 | orig_node->orig); | |
c6c8fea2 | 369 | |
c4aac1ab ML |
370 | if (gw_node == curr_gw) |
371 | goto deselect; | |
c6c8fea2 SE |
372 | } |
373 | ||
c4aac1ab | 374 | goto unlock; |
c6c8fea2 | 375 | } |
c6c8fea2 | 376 | |
42d0b044 | 377 | if (new_gwflags == BATADV_NO_FLAGS) |
c4aac1ab | 378 | goto unlock; |
c6c8fea2 | 379 | |
1409a834 | 380 | batadv_gw_node_add(bat_priv, orig_node, new_gwflags); |
c4aac1ab ML |
381 | goto unlock; |
382 | ||
383 | deselect: | |
7cf06bc6 | 384 | batadv_gw_deselect(bat_priv); |
c4aac1ab ML |
385 | unlock: |
386 | rcu_read_unlock(); | |
71e4aa9c | 387 | |
c4aac1ab | 388 | if (curr_gw) |
1409a834 | 389 | batadv_gw_node_free_ref(curr_gw); |
c6c8fea2 SE |
390 | } |
391 | ||
56303d34 SE |
392 | void batadv_gw_node_delete(struct batadv_priv *bat_priv, |
393 | struct batadv_orig_node *orig_node) | |
c6c8fea2 | 394 | { |
7cf06bc6 | 395 | batadv_gw_node_update(bat_priv, orig_node, 0); |
c6c8fea2 SE |
396 | } |
397 | ||
56303d34 | 398 | void batadv_gw_node_purge(struct batadv_priv *bat_priv) |
c6c8fea2 | 399 | { |
56303d34 | 400 | struct batadv_gw_node *gw_node, *curr_gw; |
c6c8fea2 | 401 | struct hlist_node *node, *node_tmp; |
42d0b044 | 402 | unsigned long timeout = msecs_to_jiffies(2 * BATADV_PURGE_TIMEOUT); |
b4e17054 | 403 | int do_deselect = 0; |
c4aac1ab | 404 | |
1409a834 | 405 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
c6c8fea2 SE |
406 | |
407 | spin_lock_bh(&bat_priv->gw_list_lock); | |
408 | ||
409 | hlist_for_each_entry_safe(gw_node, node, node_tmp, | |
410 | &bat_priv->gw_list, list) { | |
411 | if (((!gw_node->deleted) || | |
412 | (time_before(jiffies, gw_node->deleted + timeout))) && | |
39c75a51 | 413 | atomic_read(&bat_priv->mesh_state) == BATADV_MESH_ACTIVE) |
c6c8fea2 SE |
414 | continue; |
415 | ||
c4aac1ab ML |
416 | if (curr_gw == gw_node) |
417 | do_deselect = 1; | |
c6c8fea2 SE |
418 | |
419 | hlist_del_rcu(&gw_node->list); | |
1409a834 | 420 | batadv_gw_node_free_ref(gw_node); |
c6c8fea2 SE |
421 | } |
422 | ||
c6c8fea2 | 423 | spin_unlock_bh(&bat_priv->gw_list_lock); |
c4aac1ab ML |
424 | |
425 | /* gw_deselect() needs to acquire the gw_list_lock */ | |
426 | if (do_deselect) | |
7cf06bc6 | 427 | batadv_gw_deselect(bat_priv); |
c4aac1ab ML |
428 | |
429 | if (curr_gw) | |
1409a834 | 430 | batadv_gw_node_free_ref(curr_gw); |
c6c8fea2 SE |
431 | } |
432 | ||
9cfc7bd6 | 433 | /* fails if orig_node has no router */ |
56303d34 SE |
434 | static int batadv_write_buffer_text(struct batadv_priv *bat_priv, |
435 | struct seq_file *seq, | |
436 | const struct batadv_gw_node *gw_node) | |
c6c8fea2 | 437 | { |
56303d34 SE |
438 | struct batadv_gw_node *curr_gw; |
439 | struct batadv_neigh_node *router; | |
e1a5382f | 440 | int down, up, ret = -1; |
c6c8fea2 | 441 | |
84d5e5e0 | 442 | batadv_gw_bandwidth_to_kbit(gw_node->orig_node->gw_flags, &down, &up); |
c6c8fea2 | 443 | |
7d211efc | 444 | router = batadv_orig_node_get_router(gw_node->orig_node); |
e1a5382f LL |
445 | if (!router) |
446 | goto out; | |
5d02b3cd | 447 | |
1409a834 | 448 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
5d02b3cd | 449 | |
5d02b3cd | 450 | ret = seq_printf(seq, "%s %pM (%3i) %pM [%10s]: %3i - %i%s/%i%s\n", |
c4aac1ab ML |
451 | (curr_gw == gw_node ? "=>" : " "), |
452 | gw_node->orig_node->orig, | |
453 | router->tq_avg, router->addr, | |
454 | router->if_incoming->net_dev->name, | |
455 | gw_node->orig_node->gw_flags, | |
456 | (down > 2048 ? down / 1024 : down), | |
457 | (down > 2048 ? "MBit" : "KBit"), | |
458 | (up > 2048 ? up / 1024 : up), | |
459 | (up > 2048 ? "MBit" : "KBit")); | |
5d02b3cd | 460 | |
7d211efc | 461 | batadv_neigh_node_free_ref(router); |
c4aac1ab | 462 | if (curr_gw) |
1409a834 | 463 | batadv_gw_node_free_ref(curr_gw); |
e1a5382f | 464 | out: |
5d02b3cd | 465 | return ret; |
c6c8fea2 SE |
466 | } |
467 | ||
7cf06bc6 | 468 | int batadv_gw_client_seq_print_text(struct seq_file *seq, void *offset) |
c6c8fea2 SE |
469 | { |
470 | struct net_device *net_dev = (struct net_device *)seq->private; | |
56303d34 SE |
471 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
472 | struct batadv_hard_iface *primary_if; | |
473 | struct batadv_gw_node *gw_node; | |
c6c8fea2 | 474 | struct hlist_node *node; |
32ae9b22 | 475 | int gw_count = 0, ret = 0; |
c6c8fea2 | 476 | |
e5d89254 | 477 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 478 | if (!primary_if) { |
86ceb360 SE |
479 | ret = seq_printf(seq, |
480 | "BATMAN mesh %s disabled - please specify interfaces to enable it\n", | |
32ae9b22 ML |
481 | net_dev->name); |
482 | goto out; | |
c6c8fea2 SE |
483 | } |
484 | ||
e9a4f295 | 485 | if (primary_if->if_status != BATADV_IF_ACTIVE) { |
86ceb360 SE |
486 | ret = seq_printf(seq, |
487 | "BATMAN mesh %s disabled - primary interface not active\n", | |
32ae9b22 ML |
488 | net_dev->name); |
489 | goto out; | |
c6c8fea2 SE |
490 | } |
491 | ||
86ceb360 SE |
492 | seq_printf(seq, |
493 | " %-12s (%s/%i) %17s [%10s]: gw_class ... [B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s)]\n", | |
42d0b044 SE |
494 | "Gateway", "#", BATADV_TQ_MAX_VALUE, "Nexthop", "outgoingIF", |
495 | BATADV_SOURCE_VERSION, primary_if->net_dev->name, | |
32ae9b22 | 496 | primary_if->net_dev->dev_addr, net_dev->name); |
c6c8fea2 SE |
497 | |
498 | rcu_read_lock(); | |
499 | hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) { | |
500 | if (gw_node->deleted) | |
501 | continue; | |
502 | ||
e1a5382f | 503 | /* fails if orig_node has no router */ |
1409a834 | 504 | if (batadv_write_buffer_text(bat_priv, seq, gw_node) < 0) |
c6c8fea2 SE |
505 | continue; |
506 | ||
c6c8fea2 SE |
507 | gw_count++; |
508 | } | |
509 | rcu_read_unlock(); | |
510 | ||
511 | if (gw_count == 0) | |
512 | seq_printf(seq, "No gateways in range ...\n"); | |
513 | ||
32ae9b22 ML |
514 | out: |
515 | if (primary_if) | |
e5d89254 | 516 | batadv_hardif_free_ref(primary_if); |
32ae9b22 | 517 | return ret; |
c6c8fea2 SE |
518 | } |
519 | ||
1409a834 | 520 | static bool batadv_is_type_dhcprequest(struct sk_buff *skb, int header_len) |
43676ab5 AQ |
521 | { |
522 | int ret = false; | |
523 | unsigned char *p; | |
524 | int pkt_len; | |
525 | ||
526 | if (skb_linearize(skb) < 0) | |
527 | goto out; | |
528 | ||
529 | pkt_len = skb_headlen(skb); | |
530 | ||
347c80f0 | 531 | if (pkt_len < header_len + BATADV_DHCP_OPTIONS_OFFSET + 1) |
43676ab5 AQ |
532 | goto out; |
533 | ||
347c80f0 SE |
534 | p = skb->data + header_len + BATADV_DHCP_OPTIONS_OFFSET; |
535 | pkt_len -= header_len + BATADV_DHCP_OPTIONS_OFFSET + 1; | |
43676ab5 AQ |
536 | |
537 | /* Access the dhcp option lists. Each entry is made up by: | |
015758d0 AQ |
538 | * - octet 1: option type |
539 | * - octet 2: option data len (only if type != 255 and 0) | |
9cfc7bd6 SE |
540 | * - octet 3: option data |
541 | */ | |
43676ab5 | 542 | while (*p != 255 && !ret) { |
015758d0 | 543 | /* p now points to the first octet: option type */ |
43676ab5 AQ |
544 | if (*p == 53) { |
545 | /* type 53 is the message type option. | |
9cfc7bd6 SE |
546 | * Jump the len octet and go to the data octet |
547 | */ | |
43676ab5 AQ |
548 | if (pkt_len < 2) |
549 | goto out; | |
550 | p += 2; | |
551 | ||
552 | /* check if the message type is what we need */ | |
347c80f0 | 553 | if (*p == BATADV_DHCP_REQUEST) |
43676ab5 AQ |
554 | ret = true; |
555 | break; | |
556 | } else if (*p == 0) { | |
557 | /* option type 0 (padding), just go forward */ | |
558 | if (pkt_len < 1) | |
559 | goto out; | |
560 | pkt_len--; | |
561 | p++; | |
562 | } else { | |
563 | /* This is any other option. So we get the length... */ | |
564 | if (pkt_len < 1) | |
565 | goto out; | |
566 | pkt_len--; | |
567 | p++; | |
568 | ||
569 | /* ...and then we jump over the data */ | |
9205cc52 | 570 | if (pkt_len < 1 + (*p)) |
43676ab5 | 571 | goto out; |
9205cc52 AQ |
572 | pkt_len -= 1 + (*p); |
573 | p += 1 + (*p); | |
43676ab5 AQ |
574 | } |
575 | } | |
576 | out: | |
577 | return ret; | |
578 | } | |
579 | ||
7cf06bc6 | 580 | bool batadv_gw_is_dhcp_target(struct sk_buff *skb, unsigned int *header_len) |
c6c8fea2 SE |
581 | { |
582 | struct ethhdr *ethhdr; | |
583 | struct iphdr *iphdr; | |
584 | struct ipv6hdr *ipv6hdr; | |
585 | struct udphdr *udphdr; | |
c6c8fea2 SE |
586 | |
587 | /* check for ethernet header */ | |
be7af5cf ML |
588 | if (!pskb_may_pull(skb, *header_len + ETH_HLEN)) |
589 | return false; | |
c6c8fea2 | 590 | ethhdr = (struct ethhdr *)skb->data; |
be7af5cf | 591 | *header_len += ETH_HLEN; |
c6c8fea2 SE |
592 | |
593 | /* check for initial vlan header */ | |
594 | if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) { | |
be7af5cf ML |
595 | if (!pskb_may_pull(skb, *header_len + VLAN_HLEN)) |
596 | return false; | |
c6c8fea2 | 597 | ethhdr = (struct ethhdr *)(skb->data + VLAN_HLEN); |
be7af5cf | 598 | *header_len += VLAN_HLEN; |
c6c8fea2 SE |
599 | } |
600 | ||
601 | /* check for ip header */ | |
602 | switch (ntohs(ethhdr->h_proto)) { | |
603 | case ETH_P_IP: | |
be7af5cf ML |
604 | if (!pskb_may_pull(skb, *header_len + sizeof(*iphdr))) |
605 | return false; | |
606 | iphdr = (struct iphdr *)(skb->data + *header_len); | |
607 | *header_len += iphdr->ihl * 4; | |
c6c8fea2 SE |
608 | |
609 | /* check for udp header */ | |
610 | if (iphdr->protocol != IPPROTO_UDP) | |
be7af5cf | 611 | return false; |
c6c8fea2 SE |
612 | |
613 | break; | |
614 | case ETH_P_IPV6: | |
be7af5cf ML |
615 | if (!pskb_may_pull(skb, *header_len + sizeof(*ipv6hdr))) |
616 | return false; | |
617 | ipv6hdr = (struct ipv6hdr *)(skb->data + *header_len); | |
618 | *header_len += sizeof(*ipv6hdr); | |
c6c8fea2 SE |
619 | |
620 | /* check for udp header */ | |
621 | if (ipv6hdr->nexthdr != IPPROTO_UDP) | |
be7af5cf | 622 | return false; |
c6c8fea2 SE |
623 | |
624 | break; | |
625 | default: | |
be7af5cf | 626 | return false; |
c6c8fea2 SE |
627 | } |
628 | ||
be7af5cf ML |
629 | if (!pskb_may_pull(skb, *header_len + sizeof(*udphdr))) |
630 | return false; | |
631 | udphdr = (struct udphdr *)(skb->data + *header_len); | |
632 | *header_len += sizeof(*udphdr); | |
c6c8fea2 SE |
633 | |
634 | /* check for bootp port */ | |
635 | if ((ntohs(ethhdr->h_proto) == ETH_P_IP) && | |
7c64fd98 | 636 | (ntohs(udphdr->dest) != 67)) |
be7af5cf | 637 | return false; |
c6c8fea2 SE |
638 | |
639 | if ((ntohs(ethhdr->h_proto) == ETH_P_IPV6) && | |
640 | (ntohs(udphdr->dest) != 547)) | |
be7af5cf | 641 | return false; |
c6c8fea2 | 642 | |
be7af5cf ML |
643 | return true; |
644 | } | |
c6c8fea2 | 645 | |
56303d34 | 646 | bool batadv_gw_out_of_range(struct batadv_priv *bat_priv, |
7cf06bc6 | 647 | struct sk_buff *skb, struct ethhdr *ethhdr) |
be7af5cf | 648 | { |
56303d34 SE |
649 | struct batadv_neigh_node *neigh_curr = NULL, *neigh_old = NULL; |
650 | struct batadv_orig_node *orig_dst_node = NULL; | |
651 | struct batadv_gw_node *curr_gw = NULL; | |
be7af5cf ML |
652 | bool ret, out_of_range = false; |
653 | unsigned int header_len = 0; | |
654 | uint8_t curr_tq_avg; | |
655 | ||
7cf06bc6 | 656 | ret = batadv_gw_is_dhcp_target(skb, &header_len); |
be7af5cf ML |
657 | if (!ret) |
658 | goto out; | |
659 | ||
08c36d3e SE |
660 | orig_dst_node = batadv_transtable_search(bat_priv, ethhdr->h_source, |
661 | ethhdr->h_dest); | |
be7af5cf ML |
662 | if (!orig_dst_node) |
663 | goto out; | |
664 | ||
665 | if (!orig_dst_node->gw_flags) | |
666 | goto out; | |
667 | ||
1409a834 | 668 | ret = batadv_is_type_dhcprequest(skb, header_len); |
be7af5cf ML |
669 | if (!ret) |
670 | goto out; | |
671 | ||
672 | switch (atomic_read(&bat_priv->gw_mode)) { | |
cd646ab1 | 673 | case BATADV_GW_MODE_SERVER: |
be7af5cf | 674 | /* If we are a GW then we are our best GW. We can artificially |
9cfc7bd6 SE |
675 | * set the tq towards ourself as the maximum value |
676 | */ | |
42d0b044 | 677 | curr_tq_avg = BATADV_TQ_MAX_VALUE; |
be7af5cf | 678 | break; |
cd646ab1 | 679 | case BATADV_GW_MODE_CLIENT: |
1409a834 | 680 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
be7af5cf ML |
681 | if (!curr_gw) |
682 | goto out; | |
683 | ||
684 | /* packet is going to our gateway */ | |
685 | if (curr_gw->orig_node == orig_dst_node) | |
686 | goto out; | |
687 | ||
688 | /* If the dhcp packet has been sent to a different gw, | |
689 | * we have to evaluate whether the old gw is still | |
9cfc7bd6 SE |
690 | * reliable enough |
691 | */ | |
30d3c511 SE |
692 | neigh_curr = batadv_find_router(bat_priv, curr_gw->orig_node, |
693 | NULL); | |
be7af5cf ML |
694 | if (!neigh_curr) |
695 | goto out; | |
696 | ||
697 | curr_tq_avg = neigh_curr->tq_avg; | |
698 | break; | |
cd646ab1 | 699 | case BATADV_GW_MODE_OFF: |
be7af5cf ML |
700 | default: |
701 | goto out; | |
43676ab5 | 702 | } |
be7af5cf | 703 | |
30d3c511 | 704 | neigh_old = batadv_find_router(bat_priv, orig_dst_node, NULL); |
2ef04f47 | 705 | if (!neigh_old) |
be7af5cf ML |
706 | goto out; |
707 | ||
42d0b044 | 708 | if (curr_tq_avg - neigh_old->tq_avg > BATADV_GW_THRESHOLD) |
be7af5cf ML |
709 | out_of_range = true; |
710 | ||
711 | out: | |
712 | if (orig_dst_node) | |
7d211efc | 713 | batadv_orig_node_free_ref(orig_dst_node); |
be7af5cf | 714 | if (curr_gw) |
1409a834 | 715 | batadv_gw_node_free_ref(curr_gw); |
43676ab5 | 716 | if (neigh_old) |
7d211efc | 717 | batadv_neigh_node_free_ref(neigh_old); |
43676ab5 | 718 | if (neigh_curr) |
7d211efc | 719 | batadv_neigh_node_free_ref(neigh_curr); |
be7af5cf | 720 | return out_of_range; |
c6c8fea2 | 721 | } |