]>
Commit | Line | Data |
---|---|---|
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 | |
ebf38fb7 | 15 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
c6c8fea2 SE |
16 | */ |
17 | ||
18 | #include "main.h" | |
b706b13b | 19 | #include "sysfs.h" |
c6c8fea2 SE |
20 | #include "gateway_client.h" |
21 | #include "gateway_common.h" | |
22 | #include "hard-interface.h" | |
57f0c07c | 23 | #include "originator.h" |
be7af5cf | 24 | #include "translation-table.h" |
43676ab5 | 25 | #include "routing.h" |
c6c8fea2 SE |
26 | #include <linux/ip.h> |
27 | #include <linux/ipv6.h> | |
28 | #include <linux/udp.h> | |
29 | #include <linux/if_vlan.h> | |
30 | ||
6c413b1c AQ |
31 | /* These are the offsets of the "hw type" and "hw address length" in the dhcp |
32 | * packet starting at the beginning of the dhcp header | |
9cfc7bd6 | 33 | */ |
6c413b1c AQ |
34 | #define BATADV_DHCP_HTYPE_OFFSET 1 |
35 | #define BATADV_DHCP_HLEN_OFFSET 2 | |
36 | /* Value of htype representing Ethernet */ | |
37 | #define BATADV_DHCP_HTYPE_ETHERNET 0x01 | |
38 | /* This is the offset of the "chaddr" field in the dhcp packet starting at the | |
39 | * beginning of the dhcp header | |
40 | */ | |
41 | #define BATADV_DHCP_CHADDR_OFFSET 28 | |
43676ab5 | 42 | |
56303d34 | 43 | static void batadv_gw_node_free_ref(struct batadv_gw_node *gw_node) |
c6c8fea2 | 44 | { |
25b6d3c1 | 45 | if (atomic_dec_and_test(&gw_node->refcount)) |
eb340b2f | 46 | kfree_rcu(gw_node, rcu); |
c6c8fea2 SE |
47 | } |
48 | ||
56303d34 SE |
49 | static struct batadv_gw_node * |
50 | batadv_gw_get_selected_gw_node(struct batadv_priv *bat_priv) | |
c6c8fea2 | 51 | { |
56303d34 | 52 | struct batadv_gw_node *gw_node; |
c6c8fea2 | 53 | |
5d02b3cd | 54 | rcu_read_lock(); |
807736f6 | 55 | gw_node = rcu_dereference(bat_priv->gw.curr_gw); |
c4aac1ab | 56 | if (!gw_node) |
7b36e8ee | 57 | goto out; |
c6c8fea2 | 58 | |
c4aac1ab ML |
59 | if (!atomic_inc_not_zero(&gw_node->refcount)) |
60 | gw_node = NULL; | |
43c70ad5 | 61 | |
5d02b3cd LL |
62 | out: |
63 | rcu_read_unlock(); | |
c4aac1ab | 64 | return gw_node; |
c6c8fea2 SE |
65 | } |
66 | ||
56303d34 SE |
67 | struct batadv_orig_node * |
68 | batadv_gw_get_selected_orig(struct batadv_priv *bat_priv) | |
c6c8fea2 | 69 | { |
56303d34 SE |
70 | struct batadv_gw_node *gw_node; |
71 | struct batadv_orig_node *orig_node = NULL; | |
c6c8fea2 | 72 | |
1409a834 | 73 | gw_node = batadv_gw_get_selected_gw_node(bat_priv); |
c4aac1ab ML |
74 | if (!gw_node) |
75 | goto out; | |
76 | ||
77 | rcu_read_lock(); | |
78 | orig_node = gw_node->orig_node; | |
79 | if (!orig_node) | |
80 | goto unlock; | |
81 | ||
82 | if (!atomic_inc_not_zero(&orig_node->refcount)) | |
83 | orig_node = NULL; | |
c6c8fea2 | 84 | |
c4aac1ab ML |
85 | unlock: |
86 | rcu_read_unlock(); | |
87 | out: | |
c6c8fea2 | 88 | if (gw_node) |
1409a834 | 89 | batadv_gw_node_free_ref(gw_node); |
c4aac1ab | 90 | return orig_node; |
c6c8fea2 SE |
91 | } |
92 | ||
56303d34 SE |
93 | static void batadv_gw_select(struct batadv_priv *bat_priv, |
94 | struct batadv_gw_node *new_gw_node) | |
c6c8fea2 | 95 | { |
56303d34 | 96 | struct batadv_gw_node *curr_gw_node; |
c6c8fea2 | 97 | |
807736f6 | 98 | spin_lock_bh(&bat_priv->gw.list_lock); |
c4aac1ab | 99 | |
25b6d3c1 ML |
100 | if (new_gw_node && !atomic_inc_not_zero(&new_gw_node->refcount)) |
101 | new_gw_node = NULL; | |
c6c8fea2 | 102 | |
807736f6 SE |
103 | curr_gw_node = rcu_dereference_protected(bat_priv->gw.curr_gw, 1); |
104 | rcu_assign_pointer(bat_priv->gw.curr_gw, new_gw_node); | |
25b6d3c1 ML |
105 | |
106 | if (curr_gw_node) | |
1409a834 | 107 | batadv_gw_node_free_ref(curr_gw_node); |
c4aac1ab | 108 | |
807736f6 | 109 | spin_unlock_bh(&bat_priv->gw.list_lock); |
c4aac1ab ML |
110 | } |
111 | ||
4e820e72 AQ |
112 | /** |
113 | * batadv_gw_reselect - force a gateway reselection | |
114 | * @bat_priv: the bat priv with all the soft interface information | |
115 | * | |
116 | * Set a flag to remind the GW component to perform a new gateway reselection. | |
117 | * However this function does not ensure that the current gateway is going to be | |
118 | * deselected. The reselection mechanism may elect the same gateway once again. | |
119 | * | |
120 | * This means that invoking batadv_gw_reselect() does not guarantee a gateway | |
121 | * change and therefore a uevent is not necessarily expected. | |
122 | */ | |
123 | void batadv_gw_reselect(struct batadv_priv *bat_priv) | |
c4aac1ab | 124 | { |
807736f6 | 125 | atomic_set(&bat_priv->gw.reselect, 1); |
c6c8fea2 SE |
126 | } |
127 | ||
56303d34 SE |
128 | static struct batadv_gw_node * |
129 | batadv_gw_get_best_gw_node(struct batadv_priv *bat_priv) | |
c6c8fea2 | 130 | { |
56303d34 | 131 | struct batadv_neigh_node *router; |
89652331 | 132 | struct batadv_neigh_ifinfo *router_ifinfo; |
56303d34 | 133 | struct batadv_gw_node *gw_node, *curr_gw = NULL; |
c6c8fea2 | 134 | uint32_t max_gw_factor = 0, tmp_gw_factor = 0; |
c67893d1 | 135 | uint32_t gw_divisor; |
2265c141 | 136 | uint8_t max_tq = 0; |
c67893d1 | 137 | uint8_t tq_avg; |
56303d34 | 138 | struct batadv_orig_node *orig_node; |
c6c8fea2 | 139 | |
c67893d1 SE |
140 | gw_divisor = BATADV_TQ_LOCAL_WINDOW_SIZE * BATADV_TQ_LOCAL_WINDOW_SIZE; |
141 | gw_divisor *= 64; | |
142 | ||
c4aac1ab | 143 | rcu_read_lock(); |
b67bfe0d | 144 | hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.list, list) { |
e1a5382f | 145 | if (gw_node->deleted) |
c6c8fea2 SE |
146 | continue; |
147 | ||
84d5e5e0 | 148 | orig_node = gw_node->orig_node; |
7d211efc | 149 | router = batadv_orig_node_get_router(orig_node); |
e1a5382f | 150 | if (!router) |
c6c8fea2 SE |
151 | continue; |
152 | ||
89652331 SW |
153 | router_ifinfo = batadv_neigh_ifinfo_get(router, |
154 | BATADV_IF_DEFAULT); | |
155 | if (!router_ifinfo) | |
156 | goto next; | |
157 | ||
2265c141 AQ |
158 | if (!atomic_inc_not_zero(&gw_node->refcount)) |
159 | goto next; | |
160 | ||
89652331 | 161 | tq_avg = router_ifinfo->bat_iv.tq_avg; |
c67893d1 | 162 | |
c6c8fea2 SE |
163 | switch (atomic_read(&bat_priv->gw_sel_class)) { |
164 | case 1: /* fast connection */ | |
414254e3 ML |
165 | tmp_gw_factor = tq_avg * tq_avg; |
166 | tmp_gw_factor *= gw_node->bandwidth_down; | |
167 | tmp_gw_factor *= 100 * 100; | |
c67893d1 | 168 | tmp_gw_factor /= gw_divisor; |
c6c8fea2 SE |
169 | |
170 | if ((tmp_gw_factor > max_gw_factor) || | |
171 | ((tmp_gw_factor == max_gw_factor) && | |
c67893d1 | 172 | (tq_avg > max_tq))) { |
2265c141 | 173 | if (curr_gw) |
1409a834 | 174 | batadv_gw_node_free_ref(curr_gw); |
2265c141 AQ |
175 | curr_gw = gw_node; |
176 | atomic_inc(&curr_gw->refcount); | |
177 | } | |
c6c8fea2 SE |
178 | break; |
179 | ||
9cfc7bd6 | 180 | default: /* 2: stable connection (use best statistic) |
c6c8fea2 SE |
181 | * 3: fast-switch (use best statistic but change as |
182 | * soon as a better gateway appears) | |
183 | * XX: late-switch (use best statistic but change as | |
184 | * soon as a better gateway appears which has | |
185 | * $routing_class more tq points) | |
9cfc7bd6 | 186 | */ |
c67893d1 | 187 | if (tq_avg > max_tq) { |
2265c141 | 188 | if (curr_gw) |
1409a834 | 189 | batadv_gw_node_free_ref(curr_gw); |
2265c141 AQ |
190 | curr_gw = gw_node; |
191 | atomic_inc(&curr_gw->refcount); | |
192 | } | |
c6c8fea2 SE |
193 | break; |
194 | } | |
195 | ||
c67893d1 SE |
196 | if (tq_avg > max_tq) |
197 | max_tq = tq_avg; | |
c6c8fea2 SE |
198 | |
199 | if (tmp_gw_factor > max_gw_factor) | |
200 | max_gw_factor = tmp_gw_factor; | |
e1a5382f | 201 | |
1409a834 | 202 | batadv_gw_node_free_ref(gw_node); |
2265c141 AQ |
203 | |
204 | next: | |
7d211efc | 205 | batadv_neigh_node_free_ref(router); |
89652331 SW |
206 | if (router_ifinfo) |
207 | batadv_neigh_ifinfo_free_ref(router_ifinfo); | |
c6c8fea2 | 208 | } |
2265c141 | 209 | rcu_read_unlock(); |
c6c8fea2 | 210 | |
2265c141 AQ |
211 | return curr_gw; |
212 | } | |
c6c8fea2 | 213 | |
c6eaa3f0 AQ |
214 | /** |
215 | * batadv_gw_check_client_stop - check if client mode has been switched off | |
216 | * @bat_priv: the bat priv with all the soft interface information | |
217 | * | |
218 | * This function assumes the caller has checked that the gw state *is actually | |
219 | * changing*. This function is not supposed to be called when there is no state | |
220 | * change. | |
221 | */ | |
222 | void batadv_gw_check_client_stop(struct batadv_priv *bat_priv) | |
223 | { | |
224 | struct batadv_gw_node *curr_gw; | |
225 | ||
226 | if (atomic_read(&bat_priv->gw_mode) != BATADV_GW_MODE_CLIENT) | |
227 | return; | |
228 | ||
229 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); | |
230 | if (!curr_gw) | |
231 | return; | |
232 | ||
f3163181 AQ |
233 | /* deselect the current gateway so that next time that client mode is |
234 | * enabled a proper GW_ADD event can be sent | |
235 | */ | |
236 | batadv_gw_select(bat_priv, NULL); | |
237 | ||
c6eaa3f0 AQ |
238 | /* if batman-adv is switching the gw client mode off and a gateway was |
239 | * already selected, send a DEL uevent | |
240 | */ | |
241 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL, NULL); | |
242 | ||
243 | batadv_gw_node_free_ref(curr_gw); | |
244 | } | |
245 | ||
56303d34 | 246 | void batadv_gw_election(struct batadv_priv *bat_priv) |
2265c141 | 247 | { |
56303d34 SE |
248 | struct batadv_gw_node *curr_gw = NULL, *next_gw = NULL; |
249 | struct batadv_neigh_node *router = NULL; | |
89652331 | 250 | struct batadv_neigh_ifinfo *router_ifinfo = NULL; |
19595e05 | 251 | char gw_addr[18] = { '\0' }; |
2265c141 | 252 | |
cd646ab1 | 253 | if (atomic_read(&bat_priv->gw_mode) != BATADV_GW_MODE_CLIENT) |
2265c141 AQ |
254 | goto out; |
255 | ||
1409a834 | 256 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
2265c141 | 257 | |
807736f6 | 258 | if (!batadv_atomic_dec_not_zero(&bat_priv->gw.reselect) && curr_gw) |
caa0bf64 ML |
259 | goto out; |
260 | ||
1409a834 | 261 | next_gw = batadv_gw_get_best_gw_node(bat_priv); |
2265c141 AQ |
262 | |
263 | if (curr_gw == next_gw) | |
264 | goto out; | |
265 | ||
266 | if (next_gw) { | |
19595e05 AQ |
267 | sprintf(gw_addr, "%pM", next_gw->orig_node->orig); |
268 | ||
7d211efc | 269 | router = batadv_orig_node_get_router(next_gw->orig_node); |
2265c141 | 270 | if (!router) { |
4e820e72 | 271 | batadv_gw_reselect(bat_priv); |
2265c141 AQ |
272 | goto out; |
273 | } | |
89652331 SW |
274 | |
275 | router_ifinfo = batadv_neigh_ifinfo_get(router, | |
276 | BATADV_IF_DEFAULT); | |
277 | if (!router_ifinfo) { | |
278 | batadv_gw_reselect(bat_priv); | |
279 | goto out; | |
280 | } | |
c6c8fea2 SE |
281 | } |
282 | ||
2265c141 | 283 | if ((curr_gw) && (!next_gw)) { |
39c75a51 | 284 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 285 | "Removing selected gateway - no gateway in range\n"); |
39c75a51 SE |
286 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL, |
287 | NULL); | |
2265c141 | 288 | } else if ((!curr_gw) && (next_gw)) { |
39c75a51 | 289 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
414254e3 | 290 | "Adding route to gateway %pM (bandwidth: %u.%u/%u.%u MBit, tq: %i)\n", |
1eda58bf | 291 | next_gw->orig_node->orig, |
414254e3 ML |
292 | next_gw->bandwidth_down / 10, |
293 | next_gw->bandwidth_down % 10, | |
294 | next_gw->bandwidth_up / 10, | |
89652331 SW |
295 | next_gw->bandwidth_up % 10, |
296 | router_ifinfo->bat_iv.tq_avg); | |
39c75a51 SE |
297 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_ADD, |
298 | gw_addr); | |
2265c141 | 299 | } else { |
39c75a51 | 300 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
414254e3 | 301 | "Changing route to gateway %pM (bandwidth: %u.%u/%u.%u MBit, tq: %i)\n", |
1eda58bf | 302 | next_gw->orig_node->orig, |
414254e3 ML |
303 | next_gw->bandwidth_down / 10, |
304 | next_gw->bandwidth_down % 10, | |
305 | next_gw->bandwidth_up / 10, | |
89652331 SW |
306 | next_gw->bandwidth_up % 10, |
307 | router_ifinfo->bat_iv.tq_avg); | |
39c75a51 SE |
308 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_CHANGE, |
309 | gw_addr); | |
2265c141 AQ |
310 | } |
311 | ||
1409a834 | 312 | batadv_gw_select(bat_priv, next_gw); |
2265c141 | 313 | |
c4aac1ab ML |
314 | out: |
315 | if (curr_gw) | |
1409a834 | 316 | batadv_gw_node_free_ref(curr_gw); |
2265c141 | 317 | if (next_gw) |
1409a834 | 318 | batadv_gw_node_free_ref(next_gw); |
2265c141 | 319 | if (router) |
7d211efc | 320 | batadv_neigh_node_free_ref(router); |
89652331 SW |
321 | if (router_ifinfo) |
322 | batadv_neigh_ifinfo_free_ref(router_ifinfo); | |
c6c8fea2 SE |
323 | } |
324 | ||
56303d34 SE |
325 | void batadv_gw_check_election(struct batadv_priv *bat_priv, |
326 | struct batadv_orig_node *orig_node) | |
c6c8fea2 | 327 | { |
89652331 SW |
328 | struct batadv_neigh_ifinfo *router_orig_tq = NULL; |
329 | struct batadv_neigh_ifinfo *router_gw_tq = NULL; | |
56303d34 SE |
330 | struct batadv_orig_node *curr_gw_orig; |
331 | struct batadv_neigh_node *router_gw = NULL, *router_orig = NULL; | |
c6c8fea2 SE |
332 | uint8_t gw_tq_avg, orig_tq_avg; |
333 | ||
7cf06bc6 | 334 | curr_gw_orig = batadv_gw_get_selected_orig(bat_priv); |
57f0c07c | 335 | if (!curr_gw_orig) |
4e820e72 | 336 | goto reselect; |
c6c8fea2 | 337 | |
7d211efc | 338 | router_gw = batadv_orig_node_get_router(curr_gw_orig); |
e1a5382f | 339 | if (!router_gw) |
4e820e72 | 340 | goto reselect; |
c6c8fea2 | 341 | |
89652331 SW |
342 | router_gw_tq = batadv_neigh_ifinfo_get(router_gw, |
343 | BATADV_IF_DEFAULT); | |
344 | if (!router_gw_tq) | |
345 | goto reselect; | |
346 | ||
c6c8fea2 | 347 | /* this node already is the gateway */ |
57f0c07c | 348 | if (curr_gw_orig == orig_node) |
e1a5382f | 349 | goto out; |
c6c8fea2 | 350 | |
7d211efc | 351 | router_orig = batadv_orig_node_get_router(orig_node); |
e1a5382f LL |
352 | if (!router_orig) |
353 | goto out; | |
5d02b3cd | 354 | |
89652331 SW |
355 | router_orig_tq = batadv_neigh_ifinfo_get(router_orig, |
356 | BATADV_IF_DEFAULT); | |
357 | if (!router_orig_tq) | |
358 | goto out; | |
359 | ||
360 | gw_tq_avg = router_gw_tq->bat_iv.tq_avg; | |
361 | orig_tq_avg = router_orig_tq->bat_iv.tq_avg; | |
c6c8fea2 SE |
362 | |
363 | /* the TQ value has to be better */ | |
364 | if (orig_tq_avg < gw_tq_avg) | |
5d02b3cd | 365 | goto out; |
c6c8fea2 | 366 | |
9cfc7bd6 | 367 | /* if the routing class is greater than 3 the value tells us how much |
c6c8fea2 | 368 | * greater the TQ value of the new gateway must be |
9cfc7bd6 | 369 | */ |
c6c8fea2 SE |
370 | if ((atomic_read(&bat_priv->gw_sel_class) > 3) && |
371 | (orig_tq_avg - gw_tq_avg < atomic_read(&bat_priv->gw_sel_class))) | |
5d02b3cd | 372 | goto out; |
c6c8fea2 | 373 | |
39c75a51 | 374 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
375 | "Restarting gateway selection: better gateway found (tq curr: %i, tq new: %i)\n", |
376 | gw_tq_avg, orig_tq_avg); | |
c6c8fea2 | 377 | |
4e820e72 AQ |
378 | reselect: |
379 | batadv_gw_reselect(bat_priv); | |
5d02b3cd | 380 | out: |
57f0c07c | 381 | if (curr_gw_orig) |
7d211efc | 382 | batadv_orig_node_free_ref(curr_gw_orig); |
e1a5382f | 383 | if (router_gw) |
7d211efc | 384 | batadv_neigh_node_free_ref(router_gw); |
e1a5382f | 385 | if (router_orig) |
7d211efc | 386 | batadv_neigh_node_free_ref(router_orig); |
89652331 SW |
387 | if (router_gw_tq) |
388 | batadv_neigh_ifinfo_free_ref(router_gw_tq); | |
389 | if (router_orig_tq) | |
390 | batadv_neigh_ifinfo_free_ref(router_orig_tq); | |
57f0c07c | 391 | |
5d02b3cd | 392 | return; |
c6c8fea2 SE |
393 | } |
394 | ||
414254e3 ML |
395 | /** |
396 | * batadv_gw_node_add - add gateway node to list of available gateways | |
397 | * @bat_priv: the bat priv with all the soft interface information | |
398 | * @orig_node: originator announcing gateway capabilities | |
399 | * @gateway: announced bandwidth information | |
400 | */ | |
56303d34 SE |
401 | static void batadv_gw_node_add(struct batadv_priv *bat_priv, |
402 | struct batadv_orig_node *orig_node, | |
414254e3 | 403 | struct batadv_tvlv_gateway_data *gateway) |
c6c8fea2 | 404 | { |
56303d34 | 405 | struct batadv_gw_node *gw_node; |
414254e3 ML |
406 | |
407 | if (gateway->bandwidth_down == 0) | |
408 | return; | |
c6c8fea2 | 409 | |
704509b8 | 410 | gw_node = kzalloc(sizeof(*gw_node), GFP_ATOMIC); |
c6c8fea2 SE |
411 | if (!gw_node) |
412 | return; | |
413 | ||
c6c8fea2 SE |
414 | INIT_HLIST_NODE(&gw_node->list); |
415 | gw_node->orig_node = orig_node; | |
25b6d3c1 | 416 | atomic_set(&gw_node->refcount, 1); |
c6c8fea2 | 417 | |
807736f6 SE |
418 | spin_lock_bh(&bat_priv->gw.list_lock); |
419 | hlist_add_head_rcu(&gw_node->list, &bat_priv->gw.list); | |
420 | spin_unlock_bh(&bat_priv->gw.list_lock); | |
c6c8fea2 | 421 | |
39c75a51 | 422 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
414254e3 ML |
423 | "Found new gateway %pM -> gw bandwidth: %u.%u/%u.%u MBit\n", |
424 | orig_node->orig, | |
425 | ntohl(gateway->bandwidth_down) / 10, | |
426 | ntohl(gateway->bandwidth_down) % 10, | |
427 | ntohl(gateway->bandwidth_up) / 10, | |
428 | ntohl(gateway->bandwidth_up) % 10); | |
c6c8fea2 SE |
429 | } |
430 | ||
414254e3 ML |
431 | /** |
432 | * batadv_gw_node_get - retrieve gateway node from list of available gateways | |
433 | * @bat_priv: the bat priv with all the soft interface information | |
434 | * @orig_node: originator announcing gateway capabilities | |
435 | * | |
436 | * Returns gateway node if found or NULL otherwise. | |
437 | */ | |
438 | static struct batadv_gw_node * | |
439 | batadv_gw_node_get(struct batadv_priv *bat_priv, | |
440 | struct batadv_orig_node *orig_node) | |
c6c8fea2 | 441 | { |
414254e3 | 442 | struct batadv_gw_node *gw_node_tmp, *gw_node = NULL; |
c6c8fea2 SE |
443 | |
444 | rcu_read_lock(); | |
414254e3 ML |
445 | hlist_for_each_entry_rcu(gw_node_tmp, &bat_priv->gw.list, list) { |
446 | if (gw_node_tmp->orig_node != orig_node) | |
c6c8fea2 SE |
447 | continue; |
448 | ||
414254e3 ML |
449 | if (gw_node_tmp->deleted) |
450 | continue; | |
c6c8fea2 | 451 | |
414254e3 ML |
452 | if (!atomic_inc_not_zero(&gw_node_tmp->refcount)) |
453 | continue; | |
c6c8fea2 | 454 | |
414254e3 ML |
455 | gw_node = gw_node_tmp; |
456 | break; | |
457 | } | |
458 | rcu_read_unlock(); | |
c6c8fea2 | 459 | |
414254e3 ML |
460 | return gw_node; |
461 | } | |
c6c8fea2 | 462 | |
414254e3 ML |
463 | /** |
464 | * batadv_gw_node_update - update list of available gateways with changed | |
465 | * bandwidth information | |
466 | * @bat_priv: the bat priv with all the soft interface information | |
467 | * @orig_node: originator announcing gateway capabilities | |
468 | * @gateway: announced bandwidth information | |
469 | */ | |
470 | void batadv_gw_node_update(struct batadv_priv *bat_priv, | |
471 | struct batadv_orig_node *orig_node, | |
472 | struct batadv_tvlv_gateway_data *gateway) | |
473 | { | |
474 | struct batadv_gw_node *gw_node, *curr_gw = NULL; | |
475 | ||
476 | gw_node = batadv_gw_node_get(bat_priv, orig_node); | |
477 | if (!gw_node) { | |
478 | batadv_gw_node_add(bat_priv, orig_node, gateway); | |
479 | goto out; | |
c6c8fea2 | 480 | } |
c6c8fea2 | 481 | |
414254e3 ML |
482 | if ((gw_node->bandwidth_down == ntohl(gateway->bandwidth_down)) && |
483 | (gw_node->bandwidth_up == ntohl(gateway->bandwidth_up))) | |
484 | goto out; | |
c6c8fea2 | 485 | |
414254e3 ML |
486 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
487 | "Gateway bandwidth of originator %pM changed from %u.%u/%u.%u MBit to %u.%u/%u.%u MBit\n", | |
488 | orig_node->orig, | |
489 | gw_node->bandwidth_down / 10, | |
490 | gw_node->bandwidth_down % 10, | |
491 | gw_node->bandwidth_up / 10, | |
492 | gw_node->bandwidth_up % 10, | |
493 | ntohl(gateway->bandwidth_down) / 10, | |
494 | ntohl(gateway->bandwidth_down) % 10, | |
495 | ntohl(gateway->bandwidth_up) / 10, | |
496 | ntohl(gateway->bandwidth_up) % 10); | |
497 | ||
498 | gw_node->bandwidth_down = ntohl(gateway->bandwidth_down); | |
499 | gw_node->bandwidth_up = ntohl(gateway->bandwidth_up); | |
500 | ||
501 | gw_node->deleted = 0; | |
502 | if (ntohl(gateway->bandwidth_down) == 0) { | |
503 | gw_node->deleted = jiffies; | |
504 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
505 | "Gateway %pM removed from gateway list\n", | |
506 | orig_node->orig); | |
c4aac1ab | 507 | |
414254e3 ML |
508 | /* Note: We don't need a NULL check here, since curr_gw never |
509 | * gets dereferenced. | |
510 | */ | |
511 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); | |
512 | if (gw_node == curr_gw) | |
4e820e72 | 513 | batadv_gw_reselect(bat_priv); |
414254e3 | 514 | } |
71e4aa9c | 515 | |
414254e3 | 516 | out: |
c4aac1ab | 517 | if (curr_gw) |
1409a834 | 518 | batadv_gw_node_free_ref(curr_gw); |
414254e3 ML |
519 | if (gw_node) |
520 | batadv_gw_node_free_ref(gw_node); | |
c6c8fea2 SE |
521 | } |
522 | ||
56303d34 SE |
523 | void batadv_gw_node_delete(struct batadv_priv *bat_priv, |
524 | struct batadv_orig_node *orig_node) | |
c6c8fea2 | 525 | { |
414254e3 ML |
526 | struct batadv_tvlv_gateway_data gateway; |
527 | ||
528 | gateway.bandwidth_down = 0; | |
529 | gateway.bandwidth_up = 0; | |
530 | ||
531 | batadv_gw_node_update(bat_priv, orig_node, &gateway); | |
c6c8fea2 SE |
532 | } |
533 | ||
56303d34 | 534 | void batadv_gw_node_purge(struct batadv_priv *bat_priv) |
c6c8fea2 | 535 | { |
56303d34 | 536 | struct batadv_gw_node *gw_node, *curr_gw; |
b67bfe0d | 537 | struct hlist_node *node_tmp; |
42d0b044 | 538 | unsigned long timeout = msecs_to_jiffies(2 * BATADV_PURGE_TIMEOUT); |
4e820e72 | 539 | int do_reselect = 0; |
c4aac1ab | 540 | |
1409a834 | 541 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
c6c8fea2 | 542 | |
807736f6 | 543 | spin_lock_bh(&bat_priv->gw.list_lock); |
c6c8fea2 | 544 | |
b67bfe0d | 545 | hlist_for_each_entry_safe(gw_node, node_tmp, |
807736f6 | 546 | &bat_priv->gw.list, list) { |
c6c8fea2 SE |
547 | if (((!gw_node->deleted) || |
548 | (time_before(jiffies, gw_node->deleted + timeout))) && | |
39c75a51 | 549 | atomic_read(&bat_priv->mesh_state) == BATADV_MESH_ACTIVE) |
c6c8fea2 SE |
550 | continue; |
551 | ||
c4aac1ab | 552 | if (curr_gw == gw_node) |
4e820e72 | 553 | do_reselect = 1; |
c6c8fea2 SE |
554 | |
555 | hlist_del_rcu(&gw_node->list); | |
1409a834 | 556 | batadv_gw_node_free_ref(gw_node); |
c6c8fea2 SE |
557 | } |
558 | ||
807736f6 | 559 | spin_unlock_bh(&bat_priv->gw.list_lock); |
c4aac1ab | 560 | |
4e820e72 AQ |
561 | /* gw_reselect() needs to acquire the gw_list_lock */ |
562 | if (do_reselect) | |
563 | batadv_gw_reselect(bat_priv); | |
c4aac1ab ML |
564 | |
565 | if (curr_gw) | |
1409a834 | 566 | batadv_gw_node_free_ref(curr_gw); |
c6c8fea2 SE |
567 | } |
568 | ||
9cfc7bd6 | 569 | /* fails if orig_node has no router */ |
56303d34 SE |
570 | static int batadv_write_buffer_text(struct batadv_priv *bat_priv, |
571 | struct seq_file *seq, | |
572 | const struct batadv_gw_node *gw_node) | |
c6c8fea2 | 573 | { |
56303d34 SE |
574 | struct batadv_gw_node *curr_gw; |
575 | struct batadv_neigh_node *router; | |
89652331 | 576 | struct batadv_neigh_ifinfo *router_ifinfo = NULL; |
414254e3 | 577 | int ret = -1; |
c6c8fea2 | 578 | |
7d211efc | 579 | router = batadv_orig_node_get_router(gw_node->orig_node); |
e1a5382f LL |
580 | if (!router) |
581 | goto out; | |
5d02b3cd | 582 | |
89652331 SW |
583 | router_ifinfo = batadv_neigh_ifinfo_get(router, BATADV_IF_DEFAULT); |
584 | if (!router_ifinfo) | |
585 | goto out; | |
586 | ||
1409a834 | 587 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
5d02b3cd | 588 | |
414254e3 | 589 | ret = seq_printf(seq, "%s %pM (%3i) %pM [%10s]: %u.%u/%u.%u MBit\n", |
c4aac1ab ML |
590 | (curr_gw == gw_node ? "=>" : " "), |
591 | gw_node->orig_node->orig, | |
89652331 | 592 | router_ifinfo->bat_iv.tq_avg, router->addr, |
c4aac1ab | 593 | router->if_incoming->net_dev->name, |
414254e3 ML |
594 | gw_node->bandwidth_down / 10, |
595 | gw_node->bandwidth_down % 10, | |
596 | gw_node->bandwidth_up / 10, | |
597 | gw_node->bandwidth_up % 10); | |
5d02b3cd | 598 | |
c4aac1ab | 599 | if (curr_gw) |
1409a834 | 600 | batadv_gw_node_free_ref(curr_gw); |
e1a5382f | 601 | out: |
89652331 SW |
602 | if (router_ifinfo) |
603 | batadv_neigh_ifinfo_free_ref(router_ifinfo); | |
604 | if (router) | |
605 | batadv_neigh_node_free_ref(router); | |
5d02b3cd | 606 | return ret; |
c6c8fea2 SE |
607 | } |
608 | ||
7cf06bc6 | 609 | int batadv_gw_client_seq_print_text(struct seq_file *seq, void *offset) |
c6c8fea2 SE |
610 | { |
611 | struct net_device *net_dev = (struct net_device *)seq->private; | |
56303d34 SE |
612 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
613 | struct batadv_hard_iface *primary_if; | |
614 | struct batadv_gw_node *gw_node; | |
30da63a6 | 615 | int gw_count = 0; |
c6c8fea2 | 616 | |
30da63a6 ML |
617 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
618 | if (!primary_if) | |
32ae9b22 | 619 | goto out; |
c6c8fea2 | 620 | |
86ceb360 | 621 | seq_printf(seq, |
414254e3 | 622 | " %-12s (%s/%i) %17s [%10s]: advertised uplink bandwidth ... [B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s)]\n", |
42d0b044 SE |
623 | "Gateway", "#", BATADV_TQ_MAX_VALUE, "Nexthop", "outgoingIF", |
624 | BATADV_SOURCE_VERSION, primary_if->net_dev->name, | |
32ae9b22 | 625 | primary_if->net_dev->dev_addr, net_dev->name); |
c6c8fea2 SE |
626 | |
627 | rcu_read_lock(); | |
b67bfe0d | 628 | hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.list, list) { |
c6c8fea2 SE |
629 | if (gw_node->deleted) |
630 | continue; | |
631 | ||
e1a5382f | 632 | /* fails if orig_node has no router */ |
1409a834 | 633 | if (batadv_write_buffer_text(bat_priv, seq, gw_node) < 0) |
c6c8fea2 SE |
634 | continue; |
635 | ||
c6c8fea2 SE |
636 | gw_count++; |
637 | } | |
638 | rcu_read_unlock(); | |
639 | ||
640 | if (gw_count == 0) | |
0c814653 | 641 | seq_puts(seq, "No gateways in range ...\n"); |
c6c8fea2 | 642 | |
32ae9b22 ML |
643 | out: |
644 | if (primary_if) | |
e5d89254 | 645 | batadv_hardif_free_ref(primary_if); |
30da63a6 | 646 | return 0; |
c6c8fea2 SE |
647 | } |
648 | ||
6c413b1c AQ |
649 | /** |
650 | * batadv_gw_dhcp_recipient_get - check if a packet is a DHCP message | |
651 | * @skb: the packet to check | |
652 | * @header_len: a pointer to the batman-adv header size | |
653 | * @chaddr: buffer where the client address will be stored. Valid | |
654 | * only if the function returns BATADV_DHCP_TO_CLIENT | |
655 | * | |
656 | * Returns: | |
657 | * - BATADV_DHCP_NO if the packet is not a dhcp message or if there was an error | |
658 | * while parsing it | |
659 | * - BATADV_DHCP_TO_SERVER if this is a message going to the DHCP server | |
660 | * - BATADV_DHCP_TO_CLIENT if this is a message going to a DHCP client | |
661 | * | |
662 | * This function may re-allocate the data buffer of the skb passed as argument. | |
663 | */ | |
664 | enum batadv_dhcp_recipient | |
665 | batadv_gw_dhcp_recipient_get(struct sk_buff *skb, unsigned int *header_len, | |
666 | uint8_t *chaddr) | |
c6c8fea2 | 667 | { |
6c413b1c | 668 | enum batadv_dhcp_recipient ret = BATADV_DHCP_NO; |
c6c8fea2 SE |
669 | struct ethhdr *ethhdr; |
670 | struct iphdr *iphdr; | |
671 | struct ipv6hdr *ipv6hdr; | |
672 | struct udphdr *udphdr; | |
f7f8ed56 | 673 | struct vlan_ethhdr *vhdr; |
6c413b1c | 674 | int chaddr_offset; |
f7f8ed56 | 675 | __be16 proto; |
6c413b1c | 676 | uint8_t *p; |
c6c8fea2 SE |
677 | |
678 | /* check for ethernet header */ | |
be7af5cf | 679 | if (!pskb_may_pull(skb, *header_len + ETH_HLEN)) |
6c413b1c AQ |
680 | return BATADV_DHCP_NO; |
681 | ||
c6c8fea2 | 682 | ethhdr = (struct ethhdr *)skb->data; |
f7f8ed56 | 683 | proto = ethhdr->h_proto; |
be7af5cf | 684 | *header_len += ETH_HLEN; |
c6c8fea2 SE |
685 | |
686 | /* check for initial vlan header */ | |
f7f8ed56 | 687 | if (proto == htons(ETH_P_8021Q)) { |
be7af5cf | 688 | if (!pskb_may_pull(skb, *header_len + VLAN_HLEN)) |
6c413b1c | 689 | return BATADV_DHCP_NO; |
f7f8ed56 AQ |
690 | |
691 | vhdr = (struct vlan_ethhdr *)skb->data; | |
692 | proto = vhdr->h_vlan_encapsulated_proto; | |
be7af5cf | 693 | *header_len += VLAN_HLEN; |
c6c8fea2 SE |
694 | } |
695 | ||
696 | /* check for ip header */ | |
f7f8ed56 AQ |
697 | switch (proto) { |
698 | case htons(ETH_P_IP): | |
be7af5cf | 699 | if (!pskb_may_pull(skb, *header_len + sizeof(*iphdr))) |
6c413b1c AQ |
700 | return BATADV_DHCP_NO; |
701 | ||
be7af5cf ML |
702 | iphdr = (struct iphdr *)(skb->data + *header_len); |
703 | *header_len += iphdr->ihl * 4; | |
c6c8fea2 SE |
704 | |
705 | /* check for udp header */ | |
706 | if (iphdr->protocol != IPPROTO_UDP) | |
6c413b1c | 707 | return BATADV_DHCP_NO; |
c6c8fea2 SE |
708 | |
709 | break; | |
f7f8ed56 | 710 | case htons(ETH_P_IPV6): |
be7af5cf | 711 | if (!pskb_may_pull(skb, *header_len + sizeof(*ipv6hdr))) |
6c413b1c AQ |
712 | return BATADV_DHCP_NO; |
713 | ||
be7af5cf ML |
714 | ipv6hdr = (struct ipv6hdr *)(skb->data + *header_len); |
715 | *header_len += sizeof(*ipv6hdr); | |
c6c8fea2 SE |
716 | |
717 | /* check for udp header */ | |
718 | if (ipv6hdr->nexthdr != IPPROTO_UDP) | |
6c413b1c | 719 | return BATADV_DHCP_NO; |
c6c8fea2 SE |
720 | |
721 | break; | |
722 | default: | |
6c413b1c | 723 | return BATADV_DHCP_NO; |
c6c8fea2 SE |
724 | } |
725 | ||
be7af5cf | 726 | if (!pskb_may_pull(skb, *header_len + sizeof(*udphdr))) |
6c413b1c | 727 | return BATADV_DHCP_NO; |
9d2c9488 LL |
728 | |
729 | /* skb->data might have been reallocated by pskb_may_pull() */ | |
730 | ethhdr = (struct ethhdr *)skb->data; | |
731 | if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) | |
732 | ethhdr = (struct ethhdr *)(skb->data + VLAN_HLEN); | |
733 | ||
be7af5cf ML |
734 | udphdr = (struct udphdr *)(skb->data + *header_len); |
735 | *header_len += sizeof(*udphdr); | |
c6c8fea2 SE |
736 | |
737 | /* check for bootp port */ | |
6c413b1c AQ |
738 | switch (proto) { |
739 | case htons(ETH_P_IP): | |
740 | if (udphdr->dest == htons(67)) | |
741 | ret = BATADV_DHCP_TO_SERVER; | |
742 | else if (udphdr->source == htons(67)) | |
743 | ret = BATADV_DHCP_TO_CLIENT; | |
744 | break; | |
745 | case htons(ETH_P_IPV6): | |
746 | if (udphdr->dest == htons(547)) | |
747 | ret = BATADV_DHCP_TO_SERVER; | |
748 | else if (udphdr->source == htons(547)) | |
749 | ret = BATADV_DHCP_TO_CLIENT; | |
750 | break; | |
751 | } | |
c6c8fea2 | 752 | |
6c413b1c AQ |
753 | chaddr_offset = *header_len + BATADV_DHCP_CHADDR_OFFSET; |
754 | /* store the client address if the message is going to a client */ | |
755 | if (ret == BATADV_DHCP_TO_CLIENT && | |
756 | pskb_may_pull(skb, chaddr_offset + ETH_ALEN)) { | |
757 | /* check if the DHCP packet carries an Ethernet DHCP */ | |
758 | p = skb->data + *header_len + BATADV_DHCP_HTYPE_OFFSET; | |
759 | if (*p != BATADV_DHCP_HTYPE_ETHERNET) | |
760 | return BATADV_DHCP_NO; | |
761 | ||
762 | /* check if the DHCP packet carries a valid Ethernet address */ | |
763 | p = skb->data + *header_len + BATADV_DHCP_HLEN_OFFSET; | |
764 | if (*p != ETH_ALEN) | |
765 | return BATADV_DHCP_NO; | |
766 | ||
767 | memcpy(chaddr, skb->data + chaddr_offset, ETH_ALEN); | |
768 | } | |
c6c8fea2 | 769 | |
6c413b1c | 770 | return ret; |
be7af5cf | 771 | } |
bbb877ed AQ |
772 | /** |
773 | * batadv_gw_out_of_range - check if the dhcp request destination is the best gw | |
774 | * @bat_priv: the bat priv with all the soft interface information | |
775 | * @skb: the outgoing packet | |
776 | * | |
777 | * Check if the skb is a DHCP request and if it is sent to the current best GW | |
778 | * server. Due to topology changes it may be the case that the GW server | |
779 | * previously selected is not the best one anymore. | |
780 | * | |
781 | * Returns true if the packet destination is unicast and it is not the best gw, | |
782 | * false otherwise. | |
783 | * | |
784 | * This call might reallocate skb data. | |
6c413b1c | 785 | * Must be invoked only when the DHCP packet is going TO a DHCP SERVER. |
bbb877ed | 786 | */ |
56303d34 | 787 | bool batadv_gw_out_of_range(struct batadv_priv *bat_priv, |
9d2c9488 | 788 | struct sk_buff *skb) |
be7af5cf | 789 | { |
56303d34 SE |
790 | struct batadv_neigh_node *neigh_curr = NULL, *neigh_old = NULL; |
791 | struct batadv_orig_node *orig_dst_node = NULL; | |
414254e3 | 792 | struct batadv_gw_node *gw_node = NULL, *curr_gw = NULL; |
89652331 | 793 | struct batadv_neigh_ifinfo *curr_ifinfo, *old_ifinfo; |
6c413b1c AQ |
794 | struct ethhdr *ethhdr = (struct ethhdr *)skb->data; |
795 | bool out_of_range = false; | |
be7af5cf | 796 | uint8_t curr_tq_avg; |
bbb877ed AQ |
797 | unsigned short vid; |
798 | ||
799 | vid = batadv_get_vid(skb, 0); | |
be7af5cf | 800 | |
08c36d3e | 801 | orig_dst_node = batadv_transtable_search(bat_priv, ethhdr->h_source, |
bbb877ed | 802 | ethhdr->h_dest, vid); |
be7af5cf ML |
803 | if (!orig_dst_node) |
804 | goto out; | |
805 | ||
414254e3 ML |
806 | gw_node = batadv_gw_node_get(bat_priv, orig_dst_node); |
807 | if (!gw_node->bandwidth_down == 0) | |
be7af5cf ML |
808 | goto out; |
809 | ||
be7af5cf | 810 | switch (atomic_read(&bat_priv->gw_mode)) { |
cd646ab1 | 811 | case BATADV_GW_MODE_SERVER: |
be7af5cf | 812 | /* If we are a GW then we are our best GW. We can artificially |
9cfc7bd6 SE |
813 | * set the tq towards ourself as the maximum value |
814 | */ | |
42d0b044 | 815 | curr_tq_avg = BATADV_TQ_MAX_VALUE; |
be7af5cf | 816 | break; |
cd646ab1 | 817 | case BATADV_GW_MODE_CLIENT: |
1409a834 | 818 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
be7af5cf ML |
819 | if (!curr_gw) |
820 | goto out; | |
821 | ||
822 | /* packet is going to our gateway */ | |
823 | if (curr_gw->orig_node == orig_dst_node) | |
824 | goto out; | |
825 | ||
826 | /* If the dhcp packet has been sent to a different gw, | |
827 | * we have to evaluate whether the old gw is still | |
9cfc7bd6 SE |
828 | * reliable enough |
829 | */ | |
30d3c511 SE |
830 | neigh_curr = batadv_find_router(bat_priv, curr_gw->orig_node, |
831 | NULL); | |
be7af5cf ML |
832 | if (!neigh_curr) |
833 | goto out; | |
834 | ||
89652331 SW |
835 | curr_ifinfo = batadv_neigh_ifinfo_get(neigh_curr, |
836 | BATADV_IF_DEFAULT); | |
837 | if (!curr_ifinfo) | |
838 | goto out; | |
839 | ||
840 | curr_tq_avg = curr_ifinfo->bat_iv.tq_avg; | |
841 | batadv_neigh_ifinfo_free_ref(curr_ifinfo); | |
842 | ||
be7af5cf | 843 | break; |
cd646ab1 | 844 | case BATADV_GW_MODE_OFF: |
be7af5cf ML |
845 | default: |
846 | goto out; | |
43676ab5 | 847 | } |
be7af5cf | 848 | |
30d3c511 | 849 | neigh_old = batadv_find_router(bat_priv, orig_dst_node, NULL); |
2ef04f47 | 850 | if (!neigh_old) |
be7af5cf ML |
851 | goto out; |
852 | ||
89652331 SW |
853 | old_ifinfo = batadv_neigh_ifinfo_get(neigh_old, BATADV_IF_DEFAULT); |
854 | if (!old_ifinfo) | |
855 | goto out; | |
856 | ||
857 | if ((curr_tq_avg - old_ifinfo->bat_iv.tq_avg) > BATADV_GW_THRESHOLD) | |
be7af5cf | 858 | out_of_range = true; |
89652331 | 859 | batadv_neigh_ifinfo_free_ref(old_ifinfo); |
be7af5cf ML |
860 | |
861 | out: | |
862 | if (orig_dst_node) | |
7d211efc | 863 | batadv_orig_node_free_ref(orig_dst_node); |
be7af5cf | 864 | if (curr_gw) |
1409a834 | 865 | batadv_gw_node_free_ref(curr_gw); |
414254e3 ML |
866 | if (gw_node) |
867 | batadv_gw_node_free_ref(gw_node); | |
43676ab5 | 868 | if (neigh_old) |
7d211efc | 869 | batadv_neigh_node_free_ref(neigh_old); |
43676ab5 | 870 | if (neigh_curr) |
7d211efc | 871 | batadv_neigh_node_free_ref(neigh_curr); |
be7af5cf | 872 | return out_of_range; |
c6c8fea2 | 873 | } |