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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(); |
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; |
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; |
c67893d1 | 120 | uint32_t gw_divisor; |
2265c141 | 121 | uint8_t max_tq = 0; |
c6c8fea2 | 122 | int down, up; |
c67893d1 | 123 | uint8_t tq_avg; |
56303d34 | 124 | struct batadv_orig_node *orig_node; |
c6c8fea2 | 125 | |
c67893d1 SE |
126 | gw_divisor = BATADV_TQ_LOCAL_WINDOW_SIZE * BATADV_TQ_LOCAL_WINDOW_SIZE; |
127 | gw_divisor *= 64; | |
128 | ||
c4aac1ab | 129 | rcu_read_lock(); |
807736f6 | 130 | hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw.list, list) { |
e1a5382f | 131 | if (gw_node->deleted) |
c6c8fea2 SE |
132 | continue; |
133 | ||
84d5e5e0 | 134 | orig_node = gw_node->orig_node; |
7d211efc | 135 | router = batadv_orig_node_get_router(orig_node); |
e1a5382f | 136 | if (!router) |
c6c8fea2 SE |
137 | continue; |
138 | ||
2265c141 AQ |
139 | if (!atomic_inc_not_zero(&gw_node->refcount)) |
140 | goto next; | |
141 | ||
c67893d1 SE |
142 | tq_avg = router->tq_avg; |
143 | ||
c6c8fea2 SE |
144 | switch (atomic_read(&bat_priv->gw_sel_class)) { |
145 | case 1: /* fast connection */ | |
84d5e5e0 SE |
146 | batadv_gw_bandwidth_to_kbit(orig_node->gw_flags, |
147 | &down, &up); | |
c6c8fea2 | 148 | |
c67893d1 SE |
149 | tmp_gw_factor = tq_avg * tq_avg * down * 100 * 100; |
150 | tmp_gw_factor /= gw_divisor; | |
c6c8fea2 SE |
151 | |
152 | if ((tmp_gw_factor > max_gw_factor) || | |
153 | ((tmp_gw_factor == max_gw_factor) && | |
c67893d1 | 154 | (tq_avg > max_tq))) { |
2265c141 | 155 | if (curr_gw) |
1409a834 | 156 | batadv_gw_node_free_ref(curr_gw); |
2265c141 AQ |
157 | curr_gw = gw_node; |
158 | atomic_inc(&curr_gw->refcount); | |
159 | } | |
c6c8fea2 SE |
160 | break; |
161 | ||
9cfc7bd6 | 162 | default: /* 2: stable connection (use best statistic) |
c6c8fea2 SE |
163 | * 3: fast-switch (use best statistic but change as |
164 | * soon as a better gateway appears) | |
165 | * XX: late-switch (use best statistic but change as | |
166 | * soon as a better gateway appears which has | |
167 | * $routing_class more tq points) | |
9cfc7bd6 | 168 | */ |
c67893d1 | 169 | if (tq_avg > max_tq) { |
2265c141 | 170 | if (curr_gw) |
1409a834 | 171 | batadv_gw_node_free_ref(curr_gw); |
2265c141 AQ |
172 | curr_gw = gw_node; |
173 | atomic_inc(&curr_gw->refcount); | |
174 | } | |
c6c8fea2 SE |
175 | break; |
176 | } | |
177 | ||
c67893d1 SE |
178 | if (tq_avg > max_tq) |
179 | max_tq = tq_avg; | |
c6c8fea2 SE |
180 | |
181 | if (tmp_gw_factor > max_gw_factor) | |
182 | max_gw_factor = tmp_gw_factor; | |
e1a5382f | 183 | |
1409a834 | 184 | batadv_gw_node_free_ref(gw_node); |
2265c141 AQ |
185 | |
186 | next: | |
7d211efc | 187 | batadv_neigh_node_free_ref(router); |
c6c8fea2 | 188 | } |
2265c141 | 189 | rcu_read_unlock(); |
c6c8fea2 | 190 | |
2265c141 AQ |
191 | return curr_gw; |
192 | } | |
c6c8fea2 | 193 | |
56303d34 | 194 | void batadv_gw_election(struct batadv_priv *bat_priv) |
2265c141 | 195 | { |
56303d34 SE |
196 | struct batadv_gw_node *curr_gw = NULL, *next_gw = NULL; |
197 | struct batadv_neigh_node *router = NULL; | |
19595e05 | 198 | char gw_addr[18] = { '\0' }; |
2265c141 | 199 | |
9cfc7bd6 | 200 | /* The batman daemon checks here if we already passed a full originator |
2265c141 AQ |
201 | * cycle in order to make sure we don't choose the first gateway we |
202 | * hear about. This check is based on the daemon's uptime which we | |
203 | * don't have. | |
9cfc7bd6 | 204 | */ |
cd646ab1 | 205 | if (atomic_read(&bat_priv->gw_mode) != BATADV_GW_MODE_CLIENT) |
2265c141 AQ |
206 | goto out; |
207 | ||
1409a834 | 208 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
2265c141 | 209 | |
807736f6 | 210 | if (!batadv_atomic_dec_not_zero(&bat_priv->gw.reselect) && curr_gw) |
caa0bf64 ML |
211 | goto out; |
212 | ||
1409a834 | 213 | next_gw = batadv_gw_get_best_gw_node(bat_priv); |
2265c141 AQ |
214 | |
215 | if (curr_gw == next_gw) | |
216 | goto out; | |
217 | ||
218 | if (next_gw) { | |
19595e05 AQ |
219 | sprintf(gw_addr, "%pM", next_gw->orig_node->orig); |
220 | ||
7d211efc | 221 | router = batadv_orig_node_get_router(next_gw->orig_node); |
2265c141 | 222 | if (!router) { |
7cf06bc6 | 223 | batadv_gw_deselect(bat_priv); |
2265c141 AQ |
224 | goto out; |
225 | } | |
c6c8fea2 SE |
226 | } |
227 | ||
2265c141 | 228 | if ((curr_gw) && (!next_gw)) { |
39c75a51 | 229 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 230 | "Removing selected gateway - no gateway in range\n"); |
39c75a51 SE |
231 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL, |
232 | NULL); | |
2265c141 | 233 | } else if ((!curr_gw) && (next_gw)) { |
39c75a51 | 234 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
235 | "Adding route to gateway %pM (gw_flags: %i, tq: %i)\n", |
236 | next_gw->orig_node->orig, | |
237 | next_gw->orig_node->gw_flags, router->tq_avg); | |
39c75a51 SE |
238 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_ADD, |
239 | gw_addr); | |
2265c141 | 240 | } else { |
39c75a51 | 241 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
242 | "Changing route to gateway %pM (gw_flags: %i, tq: %i)\n", |
243 | next_gw->orig_node->orig, | |
244 | next_gw->orig_node->gw_flags, router->tq_avg); | |
39c75a51 SE |
245 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_CHANGE, |
246 | gw_addr); | |
2265c141 AQ |
247 | } |
248 | ||
1409a834 | 249 | batadv_gw_select(bat_priv, next_gw); |
2265c141 | 250 | |
c4aac1ab ML |
251 | out: |
252 | if (curr_gw) | |
1409a834 | 253 | batadv_gw_node_free_ref(curr_gw); |
2265c141 | 254 | if (next_gw) |
1409a834 | 255 | batadv_gw_node_free_ref(next_gw); |
2265c141 | 256 | if (router) |
7d211efc | 257 | batadv_neigh_node_free_ref(router); |
c6c8fea2 SE |
258 | } |
259 | ||
56303d34 SE |
260 | void batadv_gw_check_election(struct batadv_priv *bat_priv, |
261 | struct batadv_orig_node *orig_node) | |
c6c8fea2 | 262 | { |
56303d34 SE |
263 | struct batadv_orig_node *curr_gw_orig; |
264 | struct batadv_neigh_node *router_gw = NULL, *router_orig = NULL; | |
c6c8fea2 SE |
265 | uint8_t gw_tq_avg, orig_tq_avg; |
266 | ||
7cf06bc6 | 267 | curr_gw_orig = batadv_gw_get_selected_orig(bat_priv); |
57f0c07c LL |
268 | if (!curr_gw_orig) |
269 | goto deselect; | |
c6c8fea2 | 270 | |
7d211efc | 271 | router_gw = batadv_orig_node_get_router(curr_gw_orig); |
e1a5382f LL |
272 | if (!router_gw) |
273 | goto deselect; | |
c6c8fea2 SE |
274 | |
275 | /* this node already is the gateway */ | |
57f0c07c | 276 | if (curr_gw_orig == orig_node) |
e1a5382f | 277 | goto out; |
c6c8fea2 | 278 | |
7d211efc | 279 | router_orig = batadv_orig_node_get_router(orig_node); |
e1a5382f LL |
280 | if (!router_orig) |
281 | goto out; | |
5d02b3cd | 282 | |
e1a5382f LL |
283 | gw_tq_avg = router_gw->tq_avg; |
284 | orig_tq_avg = router_orig->tq_avg; | |
c6c8fea2 SE |
285 | |
286 | /* the TQ value has to be better */ | |
287 | if (orig_tq_avg < gw_tq_avg) | |
5d02b3cd | 288 | goto out; |
c6c8fea2 | 289 | |
9cfc7bd6 | 290 | /* if the routing class is greater than 3 the value tells us how much |
c6c8fea2 | 291 | * greater the TQ value of the new gateway must be |
9cfc7bd6 | 292 | */ |
c6c8fea2 SE |
293 | if ((atomic_read(&bat_priv->gw_sel_class) > 3) && |
294 | (orig_tq_avg - gw_tq_avg < atomic_read(&bat_priv->gw_sel_class))) | |
5d02b3cd | 295 | goto out; |
c6c8fea2 | 296 | |
39c75a51 | 297 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
298 | "Restarting gateway selection: better gateway found (tq curr: %i, tq new: %i)\n", |
299 | gw_tq_avg, orig_tq_avg); | |
c6c8fea2 SE |
300 | |
301 | deselect: | |
7cf06bc6 | 302 | batadv_gw_deselect(bat_priv); |
5d02b3cd | 303 | out: |
57f0c07c | 304 | if (curr_gw_orig) |
7d211efc | 305 | batadv_orig_node_free_ref(curr_gw_orig); |
e1a5382f | 306 | if (router_gw) |
7d211efc | 307 | batadv_neigh_node_free_ref(router_gw); |
e1a5382f | 308 | if (router_orig) |
7d211efc | 309 | batadv_neigh_node_free_ref(router_orig); |
57f0c07c | 310 | |
5d02b3cd | 311 | return; |
c6c8fea2 SE |
312 | } |
313 | ||
56303d34 SE |
314 | static void batadv_gw_node_add(struct batadv_priv *bat_priv, |
315 | struct batadv_orig_node *orig_node, | |
1409a834 | 316 | uint8_t new_gwflags) |
c6c8fea2 | 317 | { |
56303d34 | 318 | struct batadv_gw_node *gw_node; |
c6c8fea2 SE |
319 | int down, up; |
320 | ||
704509b8 | 321 | gw_node = kzalloc(sizeof(*gw_node), GFP_ATOMIC); |
c6c8fea2 SE |
322 | if (!gw_node) |
323 | return; | |
324 | ||
c6c8fea2 SE |
325 | INIT_HLIST_NODE(&gw_node->list); |
326 | gw_node->orig_node = orig_node; | |
25b6d3c1 | 327 | atomic_set(&gw_node->refcount, 1); |
c6c8fea2 | 328 | |
807736f6 SE |
329 | spin_lock_bh(&bat_priv->gw.list_lock); |
330 | hlist_add_head_rcu(&gw_node->list, &bat_priv->gw.list); | |
331 | spin_unlock_bh(&bat_priv->gw.list_lock); | |
c6c8fea2 | 332 | |
84d5e5e0 | 333 | batadv_gw_bandwidth_to_kbit(new_gwflags, &down, &up); |
39c75a51 | 334 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
335 | "Found new gateway %pM -> gw_class: %i - %i%s/%i%s\n", |
336 | orig_node->orig, new_gwflags, | |
337 | (down > 2048 ? down / 1024 : down), | |
338 | (down > 2048 ? "MBit" : "KBit"), | |
339 | (up > 2048 ? up / 1024 : up), | |
340 | (up > 2048 ? "MBit" : "KBit")); | |
c6c8fea2 SE |
341 | } |
342 | ||
56303d34 SE |
343 | void batadv_gw_node_update(struct batadv_priv *bat_priv, |
344 | struct batadv_orig_node *orig_node, | |
345 | uint8_t new_gwflags) | |
c6c8fea2 SE |
346 | { |
347 | struct hlist_node *node; | |
56303d34 | 348 | struct batadv_gw_node *gw_node, *curr_gw; |
c4aac1ab | 349 | |
9cfc7bd6 | 350 | /* Note: We don't need a NULL check here, since curr_gw never gets |
71e4aa9c AQ |
351 | * dereferenced. If curr_gw is NULL we also should not exit as we may |
352 | * have this gateway in our list (duplication check!) even though we | |
353 | * have no currently selected gateway. | |
354 | */ | |
1409a834 | 355 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
c6c8fea2 SE |
356 | |
357 | rcu_read_lock(); | |
807736f6 | 358 | hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw.list, list) { |
c6c8fea2 SE |
359 | if (gw_node->orig_node != orig_node) |
360 | continue; | |
361 | ||
39c75a51 | 362 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
363 | "Gateway class of originator %pM changed from %i to %i\n", |
364 | orig_node->orig, gw_node->orig_node->gw_flags, | |
365 | new_gwflags); | |
c6c8fea2 SE |
366 | |
367 | gw_node->deleted = 0; | |
368 | ||
42d0b044 | 369 | if (new_gwflags == BATADV_NO_FLAGS) { |
c6c8fea2 | 370 | gw_node->deleted = jiffies; |
39c75a51 | 371 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
372 | "Gateway %pM removed from gateway list\n", |
373 | orig_node->orig); | |
c6c8fea2 | 374 | |
c4aac1ab ML |
375 | if (gw_node == curr_gw) |
376 | goto deselect; | |
c6c8fea2 SE |
377 | } |
378 | ||
c4aac1ab | 379 | goto unlock; |
c6c8fea2 | 380 | } |
c6c8fea2 | 381 | |
42d0b044 | 382 | if (new_gwflags == BATADV_NO_FLAGS) |
c4aac1ab | 383 | goto unlock; |
c6c8fea2 | 384 | |
1409a834 | 385 | batadv_gw_node_add(bat_priv, orig_node, new_gwflags); |
c4aac1ab ML |
386 | goto unlock; |
387 | ||
388 | deselect: | |
7cf06bc6 | 389 | batadv_gw_deselect(bat_priv); |
c4aac1ab ML |
390 | unlock: |
391 | rcu_read_unlock(); | |
71e4aa9c | 392 | |
c4aac1ab | 393 | if (curr_gw) |
1409a834 | 394 | batadv_gw_node_free_ref(curr_gw); |
c6c8fea2 SE |
395 | } |
396 | ||
56303d34 SE |
397 | void batadv_gw_node_delete(struct batadv_priv *bat_priv, |
398 | struct batadv_orig_node *orig_node) | |
c6c8fea2 | 399 | { |
7cf06bc6 | 400 | batadv_gw_node_update(bat_priv, orig_node, 0); |
c6c8fea2 SE |
401 | } |
402 | ||
56303d34 | 403 | void batadv_gw_node_purge(struct batadv_priv *bat_priv) |
c6c8fea2 | 404 | { |
56303d34 | 405 | struct batadv_gw_node *gw_node, *curr_gw; |
c6c8fea2 | 406 | struct hlist_node *node, *node_tmp; |
42d0b044 | 407 | unsigned long timeout = msecs_to_jiffies(2 * BATADV_PURGE_TIMEOUT); |
b4e17054 | 408 | int do_deselect = 0; |
c4aac1ab | 409 | |
1409a834 | 410 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
c6c8fea2 | 411 | |
807736f6 | 412 | spin_lock_bh(&bat_priv->gw.list_lock); |
c6c8fea2 SE |
413 | |
414 | hlist_for_each_entry_safe(gw_node, node, node_tmp, | |
807736f6 | 415 | &bat_priv->gw.list, list) { |
c6c8fea2 SE |
416 | if (((!gw_node->deleted) || |
417 | (time_before(jiffies, gw_node->deleted + timeout))) && | |
39c75a51 | 418 | atomic_read(&bat_priv->mesh_state) == BATADV_MESH_ACTIVE) |
c6c8fea2 SE |
419 | continue; |
420 | ||
c4aac1ab ML |
421 | if (curr_gw == gw_node) |
422 | do_deselect = 1; | |
c6c8fea2 SE |
423 | |
424 | hlist_del_rcu(&gw_node->list); | |
1409a834 | 425 | batadv_gw_node_free_ref(gw_node); |
c6c8fea2 SE |
426 | } |
427 | ||
807736f6 | 428 | spin_unlock_bh(&bat_priv->gw.list_lock); |
c4aac1ab ML |
429 | |
430 | /* gw_deselect() needs to acquire the gw_list_lock */ | |
431 | if (do_deselect) | |
7cf06bc6 | 432 | batadv_gw_deselect(bat_priv); |
c4aac1ab ML |
433 | |
434 | if (curr_gw) | |
1409a834 | 435 | batadv_gw_node_free_ref(curr_gw); |
c6c8fea2 SE |
436 | } |
437 | ||
9cfc7bd6 | 438 | /* fails if orig_node has no router */ |
56303d34 SE |
439 | static int batadv_write_buffer_text(struct batadv_priv *bat_priv, |
440 | struct seq_file *seq, | |
441 | const struct batadv_gw_node *gw_node) | |
c6c8fea2 | 442 | { |
56303d34 SE |
443 | struct batadv_gw_node *curr_gw; |
444 | struct batadv_neigh_node *router; | |
e1a5382f | 445 | int down, up, ret = -1; |
c6c8fea2 | 446 | |
84d5e5e0 | 447 | batadv_gw_bandwidth_to_kbit(gw_node->orig_node->gw_flags, &down, &up); |
c6c8fea2 | 448 | |
7d211efc | 449 | router = batadv_orig_node_get_router(gw_node->orig_node); |
e1a5382f LL |
450 | if (!router) |
451 | goto out; | |
5d02b3cd | 452 | |
1409a834 | 453 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
5d02b3cd | 454 | |
5d02b3cd | 455 | ret = seq_printf(seq, "%s %pM (%3i) %pM [%10s]: %3i - %i%s/%i%s\n", |
c4aac1ab ML |
456 | (curr_gw == gw_node ? "=>" : " "), |
457 | gw_node->orig_node->orig, | |
458 | router->tq_avg, router->addr, | |
459 | router->if_incoming->net_dev->name, | |
460 | gw_node->orig_node->gw_flags, | |
461 | (down > 2048 ? down / 1024 : down), | |
462 | (down > 2048 ? "MBit" : "KBit"), | |
463 | (up > 2048 ? up / 1024 : up), | |
464 | (up > 2048 ? "MBit" : "KBit")); | |
5d02b3cd | 465 | |
7d211efc | 466 | batadv_neigh_node_free_ref(router); |
c4aac1ab | 467 | if (curr_gw) |
1409a834 | 468 | batadv_gw_node_free_ref(curr_gw); |
e1a5382f | 469 | out: |
5d02b3cd | 470 | return ret; |
c6c8fea2 SE |
471 | } |
472 | ||
7cf06bc6 | 473 | int batadv_gw_client_seq_print_text(struct seq_file *seq, void *offset) |
c6c8fea2 SE |
474 | { |
475 | struct net_device *net_dev = (struct net_device *)seq->private; | |
56303d34 SE |
476 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
477 | struct batadv_hard_iface *primary_if; | |
478 | struct batadv_gw_node *gw_node; | |
c6c8fea2 | 479 | struct hlist_node *node; |
32ae9b22 | 480 | int gw_count = 0, ret = 0; |
c6c8fea2 | 481 | |
e5d89254 | 482 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 483 | if (!primary_if) { |
86ceb360 SE |
484 | ret = seq_printf(seq, |
485 | "BATMAN mesh %s disabled - please specify interfaces to enable it\n", | |
32ae9b22 ML |
486 | net_dev->name); |
487 | goto out; | |
c6c8fea2 SE |
488 | } |
489 | ||
e9a4f295 | 490 | if (primary_if->if_status != BATADV_IF_ACTIVE) { |
86ceb360 SE |
491 | ret = seq_printf(seq, |
492 | "BATMAN mesh %s disabled - primary interface not active\n", | |
32ae9b22 ML |
493 | net_dev->name); |
494 | goto out; | |
c6c8fea2 SE |
495 | } |
496 | ||
86ceb360 SE |
497 | seq_printf(seq, |
498 | " %-12s (%s/%i) %17s [%10s]: gw_class ... [B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s)]\n", | |
42d0b044 SE |
499 | "Gateway", "#", BATADV_TQ_MAX_VALUE, "Nexthop", "outgoingIF", |
500 | BATADV_SOURCE_VERSION, primary_if->net_dev->name, | |
32ae9b22 | 501 | primary_if->net_dev->dev_addr, net_dev->name); |
c6c8fea2 SE |
502 | |
503 | rcu_read_lock(); | |
807736f6 | 504 | hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw.list, list) { |
c6c8fea2 SE |
505 | if (gw_node->deleted) |
506 | continue; | |
507 | ||
e1a5382f | 508 | /* fails if orig_node has no router */ |
1409a834 | 509 | if (batadv_write_buffer_text(bat_priv, seq, gw_node) < 0) |
c6c8fea2 SE |
510 | continue; |
511 | ||
c6c8fea2 SE |
512 | gw_count++; |
513 | } | |
514 | rcu_read_unlock(); | |
515 | ||
516 | if (gw_count == 0) | |
517 | seq_printf(seq, "No gateways in range ...\n"); | |
518 | ||
32ae9b22 ML |
519 | out: |
520 | if (primary_if) | |
e5d89254 | 521 | batadv_hardif_free_ref(primary_if); |
32ae9b22 | 522 | return ret; |
c6c8fea2 SE |
523 | } |
524 | ||
1409a834 | 525 | static bool batadv_is_type_dhcprequest(struct sk_buff *skb, int header_len) |
43676ab5 AQ |
526 | { |
527 | int ret = false; | |
528 | unsigned char *p; | |
529 | int pkt_len; | |
530 | ||
531 | if (skb_linearize(skb) < 0) | |
532 | goto out; | |
533 | ||
534 | pkt_len = skb_headlen(skb); | |
535 | ||
347c80f0 | 536 | if (pkt_len < header_len + BATADV_DHCP_OPTIONS_OFFSET + 1) |
43676ab5 AQ |
537 | goto out; |
538 | ||
347c80f0 SE |
539 | p = skb->data + header_len + BATADV_DHCP_OPTIONS_OFFSET; |
540 | pkt_len -= header_len + BATADV_DHCP_OPTIONS_OFFSET + 1; | |
43676ab5 AQ |
541 | |
542 | /* Access the dhcp option lists. Each entry is made up by: | |
015758d0 AQ |
543 | * - octet 1: option type |
544 | * - octet 2: option data len (only if type != 255 and 0) | |
9cfc7bd6 SE |
545 | * - octet 3: option data |
546 | */ | |
43676ab5 | 547 | while (*p != 255 && !ret) { |
015758d0 | 548 | /* p now points to the first octet: option type */ |
43676ab5 AQ |
549 | if (*p == 53) { |
550 | /* type 53 is the message type option. | |
9cfc7bd6 SE |
551 | * Jump the len octet and go to the data octet |
552 | */ | |
43676ab5 AQ |
553 | if (pkt_len < 2) |
554 | goto out; | |
555 | p += 2; | |
556 | ||
557 | /* check if the message type is what we need */ | |
347c80f0 | 558 | if (*p == BATADV_DHCP_REQUEST) |
43676ab5 AQ |
559 | ret = true; |
560 | break; | |
561 | } else if (*p == 0) { | |
562 | /* option type 0 (padding), just go forward */ | |
563 | if (pkt_len < 1) | |
564 | goto out; | |
565 | pkt_len--; | |
566 | p++; | |
567 | } else { | |
568 | /* This is any other option. So we get the length... */ | |
569 | if (pkt_len < 1) | |
570 | goto out; | |
571 | pkt_len--; | |
572 | p++; | |
573 | ||
574 | /* ...and then we jump over the data */ | |
9205cc52 | 575 | if (pkt_len < 1 + (*p)) |
43676ab5 | 576 | goto out; |
9205cc52 AQ |
577 | pkt_len -= 1 + (*p); |
578 | p += 1 + (*p); | |
43676ab5 AQ |
579 | } |
580 | } | |
581 | out: | |
582 | return ret; | |
583 | } | |
584 | ||
7cf06bc6 | 585 | bool batadv_gw_is_dhcp_target(struct sk_buff *skb, unsigned int *header_len) |
c6c8fea2 SE |
586 | { |
587 | struct ethhdr *ethhdr; | |
588 | struct iphdr *iphdr; | |
589 | struct ipv6hdr *ipv6hdr; | |
590 | struct udphdr *udphdr; | |
c6c8fea2 SE |
591 | |
592 | /* check for ethernet header */ | |
be7af5cf ML |
593 | if (!pskb_may_pull(skb, *header_len + ETH_HLEN)) |
594 | return false; | |
c6c8fea2 | 595 | ethhdr = (struct ethhdr *)skb->data; |
be7af5cf | 596 | *header_len += ETH_HLEN; |
c6c8fea2 SE |
597 | |
598 | /* check for initial vlan header */ | |
599 | if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) { | |
be7af5cf ML |
600 | if (!pskb_may_pull(skb, *header_len + VLAN_HLEN)) |
601 | return false; | |
c6c8fea2 | 602 | ethhdr = (struct ethhdr *)(skb->data + VLAN_HLEN); |
be7af5cf | 603 | *header_len += VLAN_HLEN; |
c6c8fea2 SE |
604 | } |
605 | ||
606 | /* check for ip header */ | |
607 | switch (ntohs(ethhdr->h_proto)) { | |
608 | case ETH_P_IP: | |
be7af5cf ML |
609 | if (!pskb_may_pull(skb, *header_len + sizeof(*iphdr))) |
610 | return false; | |
611 | iphdr = (struct iphdr *)(skb->data + *header_len); | |
612 | *header_len += iphdr->ihl * 4; | |
c6c8fea2 SE |
613 | |
614 | /* check for udp header */ | |
615 | if (iphdr->protocol != IPPROTO_UDP) | |
be7af5cf | 616 | return false; |
c6c8fea2 SE |
617 | |
618 | break; | |
619 | case ETH_P_IPV6: | |
be7af5cf ML |
620 | if (!pskb_may_pull(skb, *header_len + sizeof(*ipv6hdr))) |
621 | return false; | |
622 | ipv6hdr = (struct ipv6hdr *)(skb->data + *header_len); | |
623 | *header_len += sizeof(*ipv6hdr); | |
c6c8fea2 SE |
624 | |
625 | /* check for udp header */ | |
626 | if (ipv6hdr->nexthdr != IPPROTO_UDP) | |
be7af5cf | 627 | return false; |
c6c8fea2 SE |
628 | |
629 | break; | |
630 | default: | |
be7af5cf | 631 | return false; |
c6c8fea2 SE |
632 | } |
633 | ||
be7af5cf ML |
634 | if (!pskb_may_pull(skb, *header_len + sizeof(*udphdr))) |
635 | return false; | |
636 | udphdr = (struct udphdr *)(skb->data + *header_len); | |
637 | *header_len += sizeof(*udphdr); | |
c6c8fea2 SE |
638 | |
639 | /* check for bootp port */ | |
640 | if ((ntohs(ethhdr->h_proto) == ETH_P_IP) && | |
7c64fd98 | 641 | (ntohs(udphdr->dest) != 67)) |
be7af5cf | 642 | return false; |
c6c8fea2 SE |
643 | |
644 | if ((ntohs(ethhdr->h_proto) == ETH_P_IPV6) && | |
645 | (ntohs(udphdr->dest) != 547)) | |
be7af5cf | 646 | return false; |
c6c8fea2 | 647 | |
be7af5cf ML |
648 | return true; |
649 | } | |
c6c8fea2 | 650 | |
56303d34 | 651 | bool batadv_gw_out_of_range(struct batadv_priv *bat_priv, |
7cf06bc6 | 652 | struct sk_buff *skb, struct ethhdr *ethhdr) |
be7af5cf | 653 | { |
56303d34 SE |
654 | struct batadv_neigh_node *neigh_curr = NULL, *neigh_old = NULL; |
655 | struct batadv_orig_node *orig_dst_node = NULL; | |
656 | struct batadv_gw_node *curr_gw = NULL; | |
be7af5cf ML |
657 | bool ret, out_of_range = false; |
658 | unsigned int header_len = 0; | |
659 | uint8_t curr_tq_avg; | |
660 | ||
7cf06bc6 | 661 | ret = batadv_gw_is_dhcp_target(skb, &header_len); |
be7af5cf ML |
662 | if (!ret) |
663 | goto out; | |
664 | ||
08c36d3e SE |
665 | orig_dst_node = batadv_transtable_search(bat_priv, ethhdr->h_source, |
666 | ethhdr->h_dest); | |
be7af5cf ML |
667 | if (!orig_dst_node) |
668 | goto out; | |
669 | ||
670 | if (!orig_dst_node->gw_flags) | |
671 | goto out; | |
672 | ||
1409a834 | 673 | ret = batadv_is_type_dhcprequest(skb, header_len); |
be7af5cf ML |
674 | if (!ret) |
675 | goto out; | |
676 | ||
677 | switch (atomic_read(&bat_priv->gw_mode)) { | |
cd646ab1 | 678 | case BATADV_GW_MODE_SERVER: |
be7af5cf | 679 | /* If we are a GW then we are our best GW. We can artificially |
9cfc7bd6 SE |
680 | * set the tq towards ourself as the maximum value |
681 | */ | |
42d0b044 | 682 | curr_tq_avg = BATADV_TQ_MAX_VALUE; |
be7af5cf | 683 | break; |
cd646ab1 | 684 | case BATADV_GW_MODE_CLIENT: |
1409a834 | 685 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
be7af5cf ML |
686 | if (!curr_gw) |
687 | goto out; | |
688 | ||
689 | /* packet is going to our gateway */ | |
690 | if (curr_gw->orig_node == orig_dst_node) | |
691 | goto out; | |
692 | ||
693 | /* If the dhcp packet has been sent to a different gw, | |
694 | * we have to evaluate whether the old gw is still | |
9cfc7bd6 SE |
695 | * reliable enough |
696 | */ | |
30d3c511 SE |
697 | neigh_curr = batadv_find_router(bat_priv, curr_gw->orig_node, |
698 | NULL); | |
be7af5cf ML |
699 | if (!neigh_curr) |
700 | goto out; | |
701 | ||
702 | curr_tq_avg = neigh_curr->tq_avg; | |
703 | break; | |
cd646ab1 | 704 | case BATADV_GW_MODE_OFF: |
be7af5cf ML |
705 | default: |
706 | goto out; | |
43676ab5 | 707 | } |
be7af5cf | 708 | |
30d3c511 | 709 | neigh_old = batadv_find_router(bat_priv, orig_dst_node, NULL); |
2ef04f47 | 710 | if (!neigh_old) |
be7af5cf ML |
711 | goto out; |
712 | ||
42d0b044 | 713 | if (curr_tq_avg - neigh_old->tq_avg > BATADV_GW_THRESHOLD) |
be7af5cf ML |
714 | out_of_range = true; |
715 | ||
716 | out: | |
717 | if (orig_dst_node) | |
7d211efc | 718 | batadv_orig_node_free_ref(orig_dst_node); |
be7af5cf | 719 | if (curr_gw) |
1409a834 | 720 | batadv_gw_node_free_ref(curr_gw); |
43676ab5 | 721 | if (neigh_old) |
7d211efc | 722 | batadv_neigh_node_free_ref(neigh_old); |
43676ab5 | 723 | if (neigh_curr) |
7d211efc | 724 | batadv_neigh_node_free_ref(neigh_curr); |
be7af5cf | 725 | return out_of_range; |
c6c8fea2 | 726 | } |