Commit | Line | Data |
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e19f9759 | 1 | /* Copyright (C) 2009-2014 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; |
7351a482 | 149 | router = batadv_orig_router_get(orig_node, BATADV_IF_DEFAULT); |
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 | ||
7351a482 SW |
269 | router = batadv_orig_router_get(next_gw->orig_node, |
270 | BATADV_IF_DEFAULT); | |
2265c141 | 271 | if (!router) { |
4e820e72 | 272 | batadv_gw_reselect(bat_priv); |
2265c141 AQ |
273 | goto out; |
274 | } | |
89652331 SW |
275 | |
276 | router_ifinfo = batadv_neigh_ifinfo_get(router, | |
277 | BATADV_IF_DEFAULT); | |
278 | if (!router_ifinfo) { | |
279 | batadv_gw_reselect(bat_priv); | |
280 | goto out; | |
281 | } | |
c6c8fea2 SE |
282 | } |
283 | ||
2265c141 | 284 | if ((curr_gw) && (!next_gw)) { |
39c75a51 | 285 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 286 | "Removing selected gateway - no gateway in range\n"); |
39c75a51 SE |
287 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL, |
288 | NULL); | |
2265c141 | 289 | } else if ((!curr_gw) && (next_gw)) { |
39c75a51 | 290 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
414254e3 | 291 | "Adding route to gateway %pM (bandwidth: %u.%u/%u.%u MBit, tq: %i)\n", |
1eda58bf | 292 | next_gw->orig_node->orig, |
414254e3 ML |
293 | next_gw->bandwidth_down / 10, |
294 | next_gw->bandwidth_down % 10, | |
295 | next_gw->bandwidth_up / 10, | |
89652331 SW |
296 | next_gw->bandwidth_up % 10, |
297 | router_ifinfo->bat_iv.tq_avg); | |
39c75a51 SE |
298 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_ADD, |
299 | gw_addr); | |
2265c141 | 300 | } else { |
39c75a51 | 301 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
414254e3 | 302 | "Changing route to gateway %pM (bandwidth: %u.%u/%u.%u MBit, tq: %i)\n", |
1eda58bf | 303 | next_gw->orig_node->orig, |
414254e3 ML |
304 | next_gw->bandwidth_down / 10, |
305 | next_gw->bandwidth_down % 10, | |
306 | next_gw->bandwidth_up / 10, | |
89652331 SW |
307 | next_gw->bandwidth_up % 10, |
308 | router_ifinfo->bat_iv.tq_avg); | |
39c75a51 SE |
309 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_CHANGE, |
310 | gw_addr); | |
2265c141 AQ |
311 | } |
312 | ||
1409a834 | 313 | batadv_gw_select(bat_priv, next_gw); |
2265c141 | 314 | |
c4aac1ab ML |
315 | out: |
316 | if (curr_gw) | |
1409a834 | 317 | batadv_gw_node_free_ref(curr_gw); |
2265c141 | 318 | if (next_gw) |
1409a834 | 319 | batadv_gw_node_free_ref(next_gw); |
2265c141 | 320 | if (router) |
7d211efc | 321 | batadv_neigh_node_free_ref(router); |
89652331 SW |
322 | if (router_ifinfo) |
323 | batadv_neigh_ifinfo_free_ref(router_ifinfo); | |
c6c8fea2 SE |
324 | } |
325 | ||
56303d34 SE |
326 | void batadv_gw_check_election(struct batadv_priv *bat_priv, |
327 | struct batadv_orig_node *orig_node) | |
c6c8fea2 | 328 | { |
89652331 SW |
329 | struct batadv_neigh_ifinfo *router_orig_tq = NULL; |
330 | struct batadv_neigh_ifinfo *router_gw_tq = NULL; | |
56303d34 SE |
331 | struct batadv_orig_node *curr_gw_orig; |
332 | struct batadv_neigh_node *router_gw = NULL, *router_orig = NULL; | |
c6c8fea2 SE |
333 | uint8_t gw_tq_avg, orig_tq_avg; |
334 | ||
7cf06bc6 | 335 | curr_gw_orig = batadv_gw_get_selected_orig(bat_priv); |
57f0c07c | 336 | if (!curr_gw_orig) |
4e820e72 | 337 | goto reselect; |
c6c8fea2 | 338 | |
7351a482 | 339 | router_gw = batadv_orig_router_get(curr_gw_orig, BATADV_IF_DEFAULT); |
e1a5382f | 340 | if (!router_gw) |
4e820e72 | 341 | goto reselect; |
c6c8fea2 | 342 | |
89652331 SW |
343 | router_gw_tq = batadv_neigh_ifinfo_get(router_gw, |
344 | BATADV_IF_DEFAULT); | |
345 | if (!router_gw_tq) | |
346 | goto reselect; | |
347 | ||
c6c8fea2 | 348 | /* this node already is the gateway */ |
57f0c07c | 349 | if (curr_gw_orig == orig_node) |
e1a5382f | 350 | goto out; |
c6c8fea2 | 351 | |
7351a482 | 352 | router_orig = batadv_orig_router_get(orig_node, BATADV_IF_DEFAULT); |
e1a5382f LL |
353 | if (!router_orig) |
354 | goto out; | |
5d02b3cd | 355 | |
89652331 SW |
356 | router_orig_tq = batadv_neigh_ifinfo_get(router_orig, |
357 | BATADV_IF_DEFAULT); | |
358 | if (!router_orig_tq) | |
359 | goto out; | |
360 | ||
361 | gw_tq_avg = router_gw_tq->bat_iv.tq_avg; | |
362 | orig_tq_avg = router_orig_tq->bat_iv.tq_avg; | |
c6c8fea2 SE |
363 | |
364 | /* the TQ value has to be better */ | |
365 | if (orig_tq_avg < gw_tq_avg) | |
5d02b3cd | 366 | goto out; |
c6c8fea2 | 367 | |
9cfc7bd6 | 368 | /* if the routing class is greater than 3 the value tells us how much |
c6c8fea2 | 369 | * greater the TQ value of the new gateway must be |
9cfc7bd6 | 370 | */ |
c6c8fea2 SE |
371 | if ((atomic_read(&bat_priv->gw_sel_class) > 3) && |
372 | (orig_tq_avg - gw_tq_avg < atomic_read(&bat_priv->gw_sel_class))) | |
5d02b3cd | 373 | goto out; |
c6c8fea2 | 374 | |
39c75a51 | 375 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
376 | "Restarting gateway selection: better gateway found (tq curr: %i, tq new: %i)\n", |
377 | gw_tq_avg, orig_tq_avg); | |
c6c8fea2 | 378 | |
4e820e72 AQ |
379 | reselect: |
380 | batadv_gw_reselect(bat_priv); | |
5d02b3cd | 381 | out: |
57f0c07c | 382 | if (curr_gw_orig) |
7d211efc | 383 | batadv_orig_node_free_ref(curr_gw_orig); |
e1a5382f | 384 | if (router_gw) |
7d211efc | 385 | batadv_neigh_node_free_ref(router_gw); |
e1a5382f | 386 | if (router_orig) |
7d211efc | 387 | batadv_neigh_node_free_ref(router_orig); |
89652331 SW |
388 | if (router_gw_tq) |
389 | batadv_neigh_ifinfo_free_ref(router_gw_tq); | |
390 | if (router_orig_tq) | |
391 | batadv_neigh_ifinfo_free_ref(router_orig_tq); | |
c6c8fea2 SE |
392 | } |
393 | ||
414254e3 ML |
394 | /** |
395 | * batadv_gw_node_add - add gateway node to list of available gateways | |
396 | * @bat_priv: the bat priv with all the soft interface information | |
397 | * @orig_node: originator announcing gateway capabilities | |
398 | * @gateway: announced bandwidth information | |
399 | */ | |
56303d34 SE |
400 | static void batadv_gw_node_add(struct batadv_priv *bat_priv, |
401 | struct batadv_orig_node *orig_node, | |
414254e3 | 402 | struct batadv_tvlv_gateway_data *gateway) |
c6c8fea2 | 403 | { |
56303d34 | 404 | struct batadv_gw_node *gw_node; |
414254e3 ML |
405 | |
406 | if (gateway->bandwidth_down == 0) | |
407 | return; | |
c6c8fea2 | 408 | |
704509b8 | 409 | gw_node = kzalloc(sizeof(*gw_node), GFP_ATOMIC); |
c6c8fea2 SE |
410 | if (!gw_node) |
411 | return; | |
412 | ||
c6c8fea2 SE |
413 | INIT_HLIST_NODE(&gw_node->list); |
414 | gw_node->orig_node = orig_node; | |
25b6d3c1 | 415 | atomic_set(&gw_node->refcount, 1); |
c6c8fea2 | 416 | |
807736f6 SE |
417 | spin_lock_bh(&bat_priv->gw.list_lock); |
418 | hlist_add_head_rcu(&gw_node->list, &bat_priv->gw.list); | |
419 | spin_unlock_bh(&bat_priv->gw.list_lock); | |
c6c8fea2 | 420 | |
39c75a51 | 421 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
414254e3 ML |
422 | "Found new gateway %pM -> gw bandwidth: %u.%u/%u.%u MBit\n", |
423 | orig_node->orig, | |
424 | ntohl(gateway->bandwidth_down) / 10, | |
425 | ntohl(gateway->bandwidth_down) % 10, | |
426 | ntohl(gateway->bandwidth_up) / 10, | |
427 | ntohl(gateway->bandwidth_up) % 10); | |
c6c8fea2 SE |
428 | } |
429 | ||
414254e3 ML |
430 | /** |
431 | * batadv_gw_node_get - retrieve gateway node from list of available gateways | |
432 | * @bat_priv: the bat priv with all the soft interface information | |
433 | * @orig_node: originator announcing gateway capabilities | |
434 | * | |
435 | * Returns gateway node if found or NULL otherwise. | |
436 | */ | |
437 | static struct batadv_gw_node * | |
438 | batadv_gw_node_get(struct batadv_priv *bat_priv, | |
439 | struct batadv_orig_node *orig_node) | |
c6c8fea2 | 440 | { |
414254e3 | 441 | struct batadv_gw_node *gw_node_tmp, *gw_node = NULL; |
c6c8fea2 SE |
442 | |
443 | rcu_read_lock(); | |
414254e3 ML |
444 | hlist_for_each_entry_rcu(gw_node_tmp, &bat_priv->gw.list, list) { |
445 | if (gw_node_tmp->orig_node != orig_node) | |
c6c8fea2 SE |
446 | continue; |
447 | ||
414254e3 ML |
448 | if (gw_node_tmp->deleted) |
449 | continue; | |
c6c8fea2 | 450 | |
414254e3 ML |
451 | if (!atomic_inc_not_zero(&gw_node_tmp->refcount)) |
452 | continue; | |
c6c8fea2 | 453 | |
414254e3 ML |
454 | gw_node = gw_node_tmp; |
455 | break; | |
456 | } | |
457 | rcu_read_unlock(); | |
c6c8fea2 | 458 | |
414254e3 ML |
459 | return gw_node; |
460 | } | |
c6c8fea2 | 461 | |
414254e3 ML |
462 | /** |
463 | * batadv_gw_node_update - update list of available gateways with changed | |
464 | * bandwidth information | |
465 | * @bat_priv: the bat priv with all the soft interface information | |
466 | * @orig_node: originator announcing gateway capabilities | |
467 | * @gateway: announced bandwidth information | |
468 | */ | |
469 | void batadv_gw_node_update(struct batadv_priv *bat_priv, | |
470 | struct batadv_orig_node *orig_node, | |
471 | struct batadv_tvlv_gateway_data *gateway) | |
472 | { | |
473 | struct batadv_gw_node *gw_node, *curr_gw = NULL; | |
474 | ||
475 | gw_node = batadv_gw_node_get(bat_priv, orig_node); | |
476 | if (!gw_node) { | |
477 | batadv_gw_node_add(bat_priv, orig_node, gateway); | |
478 | goto out; | |
c6c8fea2 | 479 | } |
c6c8fea2 | 480 | |
414254e3 ML |
481 | if ((gw_node->bandwidth_down == ntohl(gateway->bandwidth_down)) && |
482 | (gw_node->bandwidth_up == ntohl(gateway->bandwidth_up))) | |
483 | goto out; | |
c6c8fea2 | 484 | |
414254e3 ML |
485 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
486 | "Gateway bandwidth of originator %pM changed from %u.%u/%u.%u MBit to %u.%u/%u.%u MBit\n", | |
487 | orig_node->orig, | |
488 | gw_node->bandwidth_down / 10, | |
489 | gw_node->bandwidth_down % 10, | |
490 | gw_node->bandwidth_up / 10, | |
491 | gw_node->bandwidth_up % 10, | |
492 | ntohl(gateway->bandwidth_down) / 10, | |
493 | ntohl(gateway->bandwidth_down) % 10, | |
494 | ntohl(gateway->bandwidth_up) / 10, | |
495 | ntohl(gateway->bandwidth_up) % 10); | |
496 | ||
497 | gw_node->bandwidth_down = ntohl(gateway->bandwidth_down); | |
498 | gw_node->bandwidth_up = ntohl(gateway->bandwidth_up); | |
499 | ||
500 | gw_node->deleted = 0; | |
501 | if (ntohl(gateway->bandwidth_down) == 0) { | |
502 | gw_node->deleted = jiffies; | |
503 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
504 | "Gateway %pM removed from gateway list\n", | |
505 | orig_node->orig); | |
c4aac1ab | 506 | |
414254e3 ML |
507 | /* Note: We don't need a NULL check here, since curr_gw never |
508 | * gets dereferenced. | |
509 | */ | |
510 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); | |
511 | if (gw_node == curr_gw) | |
4e820e72 | 512 | batadv_gw_reselect(bat_priv); |
414254e3 | 513 | } |
71e4aa9c | 514 | |
414254e3 | 515 | out: |
c4aac1ab | 516 | if (curr_gw) |
1409a834 | 517 | batadv_gw_node_free_ref(curr_gw); |
414254e3 ML |
518 | if (gw_node) |
519 | batadv_gw_node_free_ref(gw_node); | |
c6c8fea2 SE |
520 | } |
521 | ||
56303d34 SE |
522 | void batadv_gw_node_delete(struct batadv_priv *bat_priv, |
523 | struct batadv_orig_node *orig_node) | |
c6c8fea2 | 524 | { |
414254e3 ML |
525 | struct batadv_tvlv_gateway_data gateway; |
526 | ||
527 | gateway.bandwidth_down = 0; | |
528 | gateway.bandwidth_up = 0; | |
529 | ||
530 | batadv_gw_node_update(bat_priv, orig_node, &gateway); | |
c6c8fea2 SE |
531 | } |
532 | ||
56303d34 | 533 | void batadv_gw_node_purge(struct batadv_priv *bat_priv) |
c6c8fea2 | 534 | { |
56303d34 | 535 | struct batadv_gw_node *gw_node, *curr_gw; |
b67bfe0d | 536 | struct hlist_node *node_tmp; |
42d0b044 | 537 | unsigned long timeout = msecs_to_jiffies(2 * BATADV_PURGE_TIMEOUT); |
4e820e72 | 538 | int do_reselect = 0; |
c4aac1ab | 539 | |
1409a834 | 540 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
c6c8fea2 | 541 | |
807736f6 | 542 | spin_lock_bh(&bat_priv->gw.list_lock); |
c6c8fea2 | 543 | |
b67bfe0d | 544 | hlist_for_each_entry_safe(gw_node, node_tmp, |
807736f6 | 545 | &bat_priv->gw.list, list) { |
c6c8fea2 SE |
546 | if (((!gw_node->deleted) || |
547 | (time_before(jiffies, gw_node->deleted + timeout))) && | |
39c75a51 | 548 | atomic_read(&bat_priv->mesh_state) == BATADV_MESH_ACTIVE) |
c6c8fea2 SE |
549 | continue; |
550 | ||
c4aac1ab | 551 | if (curr_gw == gw_node) |
4e820e72 | 552 | do_reselect = 1; |
c6c8fea2 SE |
553 | |
554 | hlist_del_rcu(&gw_node->list); | |
1409a834 | 555 | batadv_gw_node_free_ref(gw_node); |
c6c8fea2 SE |
556 | } |
557 | ||
807736f6 | 558 | spin_unlock_bh(&bat_priv->gw.list_lock); |
c4aac1ab | 559 | |
4e820e72 AQ |
560 | /* gw_reselect() needs to acquire the gw_list_lock */ |
561 | if (do_reselect) | |
562 | batadv_gw_reselect(bat_priv); | |
c4aac1ab ML |
563 | |
564 | if (curr_gw) | |
1409a834 | 565 | batadv_gw_node_free_ref(curr_gw); |
c6c8fea2 SE |
566 | } |
567 | ||
9cfc7bd6 | 568 | /* fails if orig_node has no router */ |
56303d34 SE |
569 | static int batadv_write_buffer_text(struct batadv_priv *bat_priv, |
570 | struct seq_file *seq, | |
571 | const struct batadv_gw_node *gw_node) | |
c6c8fea2 | 572 | { |
56303d34 SE |
573 | struct batadv_gw_node *curr_gw; |
574 | struct batadv_neigh_node *router; | |
89652331 | 575 | struct batadv_neigh_ifinfo *router_ifinfo = NULL; |
414254e3 | 576 | int ret = -1; |
c6c8fea2 | 577 | |
7351a482 | 578 | router = batadv_orig_router_get(gw_node->orig_node, BATADV_IF_DEFAULT); |
e1a5382f LL |
579 | if (!router) |
580 | goto out; | |
5d02b3cd | 581 | |
89652331 SW |
582 | router_ifinfo = batadv_neigh_ifinfo_get(router, BATADV_IF_DEFAULT); |
583 | if (!router_ifinfo) | |
584 | goto out; | |
585 | ||
1409a834 | 586 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
5d02b3cd | 587 | |
414254e3 | 588 | ret = seq_printf(seq, "%s %pM (%3i) %pM [%10s]: %u.%u/%u.%u MBit\n", |
c4aac1ab ML |
589 | (curr_gw == gw_node ? "=>" : " "), |
590 | gw_node->orig_node->orig, | |
89652331 | 591 | router_ifinfo->bat_iv.tq_avg, router->addr, |
c4aac1ab | 592 | router->if_incoming->net_dev->name, |
414254e3 ML |
593 | gw_node->bandwidth_down / 10, |
594 | gw_node->bandwidth_down % 10, | |
595 | gw_node->bandwidth_up / 10, | |
596 | gw_node->bandwidth_up % 10); | |
5d02b3cd | 597 | |
c4aac1ab | 598 | if (curr_gw) |
1409a834 | 599 | batadv_gw_node_free_ref(curr_gw); |
e1a5382f | 600 | out: |
89652331 SW |
601 | if (router_ifinfo) |
602 | batadv_neigh_ifinfo_free_ref(router_ifinfo); | |
603 | if (router) | |
604 | batadv_neigh_node_free_ref(router); | |
5d02b3cd | 605 | return ret; |
c6c8fea2 SE |
606 | } |
607 | ||
7cf06bc6 | 608 | int batadv_gw_client_seq_print_text(struct seq_file *seq, void *offset) |
c6c8fea2 SE |
609 | { |
610 | struct net_device *net_dev = (struct net_device *)seq->private; | |
56303d34 SE |
611 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
612 | struct batadv_hard_iface *primary_if; | |
613 | struct batadv_gw_node *gw_node; | |
30da63a6 | 614 | int gw_count = 0; |
c6c8fea2 | 615 | |
30da63a6 ML |
616 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
617 | if (!primary_if) | |
32ae9b22 | 618 | goto out; |
c6c8fea2 | 619 | |
86ceb360 | 620 | seq_printf(seq, |
414254e3 | 621 | " %-12s (%s/%i) %17s [%10s]: advertised uplink bandwidth ... [B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s)]\n", |
42d0b044 SE |
622 | "Gateway", "#", BATADV_TQ_MAX_VALUE, "Nexthop", "outgoingIF", |
623 | BATADV_SOURCE_VERSION, primary_if->net_dev->name, | |
32ae9b22 | 624 | primary_if->net_dev->dev_addr, net_dev->name); |
c6c8fea2 SE |
625 | |
626 | rcu_read_lock(); | |
b67bfe0d | 627 | hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.list, list) { |
c6c8fea2 SE |
628 | if (gw_node->deleted) |
629 | continue; | |
630 | ||
e1a5382f | 631 | /* fails if orig_node has no router */ |
1409a834 | 632 | if (batadv_write_buffer_text(bat_priv, seq, gw_node) < 0) |
c6c8fea2 SE |
633 | continue; |
634 | ||
c6c8fea2 SE |
635 | gw_count++; |
636 | } | |
637 | rcu_read_unlock(); | |
638 | ||
639 | if (gw_count == 0) | |
0c814653 | 640 | seq_puts(seq, "No gateways in range ...\n"); |
c6c8fea2 | 641 | |
32ae9b22 ML |
642 | out: |
643 | if (primary_if) | |
e5d89254 | 644 | batadv_hardif_free_ref(primary_if); |
30da63a6 | 645 | return 0; |
c6c8fea2 SE |
646 | } |
647 | ||
6c413b1c AQ |
648 | /** |
649 | * batadv_gw_dhcp_recipient_get - check if a packet is a DHCP message | |
650 | * @skb: the packet to check | |
651 | * @header_len: a pointer to the batman-adv header size | |
652 | * @chaddr: buffer where the client address will be stored. Valid | |
653 | * only if the function returns BATADV_DHCP_TO_CLIENT | |
654 | * | |
655 | * Returns: | |
656 | * - BATADV_DHCP_NO if the packet is not a dhcp message or if there was an error | |
657 | * while parsing it | |
658 | * - BATADV_DHCP_TO_SERVER if this is a message going to the DHCP server | |
659 | * - BATADV_DHCP_TO_CLIENT if this is a message going to a DHCP client | |
660 | * | |
661 | * This function may re-allocate the data buffer of the skb passed as argument. | |
662 | */ | |
663 | enum batadv_dhcp_recipient | |
664 | batadv_gw_dhcp_recipient_get(struct sk_buff *skb, unsigned int *header_len, | |
665 | uint8_t *chaddr) | |
c6c8fea2 | 666 | { |
6c413b1c | 667 | enum batadv_dhcp_recipient ret = BATADV_DHCP_NO; |
c6c8fea2 SE |
668 | struct ethhdr *ethhdr; |
669 | struct iphdr *iphdr; | |
670 | struct ipv6hdr *ipv6hdr; | |
671 | struct udphdr *udphdr; | |
f7f8ed56 | 672 | struct vlan_ethhdr *vhdr; |
6c413b1c | 673 | int chaddr_offset; |
f7f8ed56 | 674 | __be16 proto; |
6c413b1c | 675 | uint8_t *p; |
c6c8fea2 SE |
676 | |
677 | /* check for ethernet header */ | |
be7af5cf | 678 | if (!pskb_may_pull(skb, *header_len + ETH_HLEN)) |
6c413b1c AQ |
679 | return BATADV_DHCP_NO; |
680 | ||
927c2ed7 | 681 | ethhdr = eth_hdr(skb); |
f7f8ed56 | 682 | proto = ethhdr->h_proto; |
be7af5cf | 683 | *header_len += ETH_HLEN; |
c6c8fea2 SE |
684 | |
685 | /* check for initial vlan header */ | |
f7f8ed56 | 686 | if (proto == htons(ETH_P_8021Q)) { |
be7af5cf | 687 | if (!pskb_may_pull(skb, *header_len + VLAN_HLEN)) |
6c413b1c | 688 | return BATADV_DHCP_NO; |
f7f8ed56 | 689 | |
927c2ed7 | 690 | vhdr = vlan_eth_hdr(skb); |
f7f8ed56 | 691 | proto = vhdr->h_vlan_encapsulated_proto; |
be7af5cf | 692 | *header_len += VLAN_HLEN; |
c6c8fea2 SE |
693 | } |
694 | ||
695 | /* check for ip header */ | |
f7f8ed56 AQ |
696 | switch (proto) { |
697 | case htons(ETH_P_IP): | |
be7af5cf | 698 | if (!pskb_may_pull(skb, *header_len + sizeof(*iphdr))) |
6c413b1c AQ |
699 | return BATADV_DHCP_NO; |
700 | ||
be7af5cf ML |
701 | iphdr = (struct iphdr *)(skb->data + *header_len); |
702 | *header_len += iphdr->ihl * 4; | |
c6c8fea2 SE |
703 | |
704 | /* check for udp header */ | |
705 | if (iphdr->protocol != IPPROTO_UDP) | |
6c413b1c | 706 | return BATADV_DHCP_NO; |
c6c8fea2 SE |
707 | |
708 | break; | |
f7f8ed56 | 709 | case htons(ETH_P_IPV6): |
be7af5cf | 710 | if (!pskb_may_pull(skb, *header_len + sizeof(*ipv6hdr))) |
6c413b1c AQ |
711 | return BATADV_DHCP_NO; |
712 | ||
be7af5cf ML |
713 | ipv6hdr = (struct ipv6hdr *)(skb->data + *header_len); |
714 | *header_len += sizeof(*ipv6hdr); | |
c6c8fea2 SE |
715 | |
716 | /* check for udp header */ | |
717 | if (ipv6hdr->nexthdr != IPPROTO_UDP) | |
6c413b1c | 718 | return BATADV_DHCP_NO; |
c6c8fea2 SE |
719 | |
720 | break; | |
721 | default: | |
6c413b1c | 722 | return BATADV_DHCP_NO; |
c6c8fea2 SE |
723 | } |
724 | ||
be7af5cf | 725 | if (!pskb_may_pull(skb, *header_len + sizeof(*udphdr))) |
6c413b1c | 726 | return BATADV_DHCP_NO; |
9d2c9488 LL |
727 | |
728 | /* skb->data might have been reallocated by pskb_may_pull() */ | |
927c2ed7 | 729 | ethhdr = eth_hdr(skb); |
9d2c9488 LL |
730 | if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) |
731 | ethhdr = (struct ethhdr *)(skb->data + VLAN_HLEN); | |
732 | ||
be7af5cf ML |
733 | udphdr = (struct udphdr *)(skb->data + *header_len); |
734 | *header_len += sizeof(*udphdr); | |
c6c8fea2 SE |
735 | |
736 | /* check for bootp port */ | |
6c413b1c AQ |
737 | switch (proto) { |
738 | case htons(ETH_P_IP): | |
739 | if (udphdr->dest == htons(67)) | |
740 | ret = BATADV_DHCP_TO_SERVER; | |
741 | else if (udphdr->source == htons(67)) | |
742 | ret = BATADV_DHCP_TO_CLIENT; | |
743 | break; | |
744 | case htons(ETH_P_IPV6): | |
745 | if (udphdr->dest == htons(547)) | |
746 | ret = BATADV_DHCP_TO_SERVER; | |
747 | else if (udphdr->source == htons(547)) | |
748 | ret = BATADV_DHCP_TO_CLIENT; | |
749 | break; | |
750 | } | |
c6c8fea2 | 751 | |
6c413b1c AQ |
752 | chaddr_offset = *header_len + BATADV_DHCP_CHADDR_OFFSET; |
753 | /* store the client address if the message is going to a client */ | |
754 | if (ret == BATADV_DHCP_TO_CLIENT && | |
755 | pskb_may_pull(skb, chaddr_offset + ETH_ALEN)) { | |
756 | /* check if the DHCP packet carries an Ethernet DHCP */ | |
757 | p = skb->data + *header_len + BATADV_DHCP_HTYPE_OFFSET; | |
758 | if (*p != BATADV_DHCP_HTYPE_ETHERNET) | |
759 | return BATADV_DHCP_NO; | |
760 | ||
761 | /* check if the DHCP packet carries a valid Ethernet address */ | |
762 | p = skb->data + *header_len + BATADV_DHCP_HLEN_OFFSET; | |
763 | if (*p != ETH_ALEN) | |
764 | return BATADV_DHCP_NO; | |
765 | ||
8fdd0153 | 766 | ether_addr_copy(chaddr, skb->data + chaddr_offset); |
6c413b1c | 767 | } |
c6c8fea2 | 768 | |
6c413b1c | 769 | return ret; |
be7af5cf | 770 | } |
bbb877ed AQ |
771 | /** |
772 | * batadv_gw_out_of_range - check if the dhcp request destination is the best gw | |
773 | * @bat_priv: the bat priv with all the soft interface information | |
774 | * @skb: the outgoing packet | |
775 | * | |
776 | * Check if the skb is a DHCP request and if it is sent to the current best GW | |
777 | * server. Due to topology changes it may be the case that the GW server | |
778 | * previously selected is not the best one anymore. | |
779 | * | |
780 | * Returns true if the packet destination is unicast and it is not the best gw, | |
781 | * false otherwise. | |
782 | * | |
783 | * This call might reallocate skb data. | |
6c413b1c | 784 | * Must be invoked only when the DHCP packet is going TO a DHCP SERVER. |
bbb877ed | 785 | */ |
56303d34 | 786 | bool batadv_gw_out_of_range(struct batadv_priv *bat_priv, |
9d2c9488 | 787 | struct sk_buff *skb) |
be7af5cf | 788 | { |
56303d34 SE |
789 | struct batadv_neigh_node *neigh_curr = NULL, *neigh_old = NULL; |
790 | struct batadv_orig_node *orig_dst_node = NULL; | |
414254e3 | 791 | struct batadv_gw_node *gw_node = NULL, *curr_gw = NULL; |
89652331 | 792 | struct batadv_neigh_ifinfo *curr_ifinfo, *old_ifinfo; |
6c413b1c AQ |
793 | struct ethhdr *ethhdr = (struct ethhdr *)skb->data; |
794 | bool out_of_range = false; | |
be7af5cf | 795 | uint8_t curr_tq_avg; |
bbb877ed AQ |
796 | unsigned short vid; |
797 | ||
798 | vid = batadv_get_vid(skb, 0); | |
be7af5cf | 799 | |
08c36d3e | 800 | orig_dst_node = batadv_transtable_search(bat_priv, ethhdr->h_source, |
bbb877ed | 801 | ethhdr->h_dest, vid); |
be7af5cf ML |
802 | if (!orig_dst_node) |
803 | goto out; | |
804 | ||
414254e3 ML |
805 | gw_node = batadv_gw_node_get(bat_priv, orig_dst_node); |
806 | if (!gw_node->bandwidth_down == 0) | |
be7af5cf ML |
807 | goto out; |
808 | ||
be7af5cf | 809 | switch (atomic_read(&bat_priv->gw_mode)) { |
cd646ab1 | 810 | case BATADV_GW_MODE_SERVER: |
be7af5cf | 811 | /* If we are a GW then we are our best GW. We can artificially |
9cfc7bd6 SE |
812 | * set the tq towards ourself as the maximum value |
813 | */ | |
42d0b044 | 814 | curr_tq_avg = BATADV_TQ_MAX_VALUE; |
be7af5cf | 815 | break; |
cd646ab1 | 816 | case BATADV_GW_MODE_CLIENT: |
1409a834 | 817 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
be7af5cf ML |
818 | if (!curr_gw) |
819 | goto out; | |
820 | ||
821 | /* packet is going to our gateway */ | |
822 | if (curr_gw->orig_node == orig_dst_node) | |
823 | goto out; | |
824 | ||
825 | /* If the dhcp packet has been sent to a different gw, | |
826 | * we have to evaluate whether the old gw is still | |
9cfc7bd6 SE |
827 | * reliable enough |
828 | */ | |
30d3c511 SE |
829 | neigh_curr = batadv_find_router(bat_priv, curr_gw->orig_node, |
830 | NULL); | |
be7af5cf ML |
831 | if (!neigh_curr) |
832 | goto out; | |
833 | ||
89652331 SW |
834 | curr_ifinfo = batadv_neigh_ifinfo_get(neigh_curr, |
835 | BATADV_IF_DEFAULT); | |
836 | if (!curr_ifinfo) | |
837 | goto out; | |
838 | ||
839 | curr_tq_avg = curr_ifinfo->bat_iv.tq_avg; | |
840 | batadv_neigh_ifinfo_free_ref(curr_ifinfo); | |
841 | ||
be7af5cf | 842 | break; |
cd646ab1 | 843 | case BATADV_GW_MODE_OFF: |
be7af5cf ML |
844 | default: |
845 | goto out; | |
43676ab5 | 846 | } |
be7af5cf | 847 | |
30d3c511 | 848 | neigh_old = batadv_find_router(bat_priv, orig_dst_node, NULL); |
2ef04f47 | 849 | if (!neigh_old) |
be7af5cf ML |
850 | goto out; |
851 | ||
89652331 SW |
852 | old_ifinfo = batadv_neigh_ifinfo_get(neigh_old, BATADV_IF_DEFAULT); |
853 | if (!old_ifinfo) | |
854 | goto out; | |
855 | ||
856 | if ((curr_tq_avg - old_ifinfo->bat_iv.tq_avg) > BATADV_GW_THRESHOLD) | |
be7af5cf | 857 | out_of_range = true; |
89652331 | 858 | batadv_neigh_ifinfo_free_ref(old_ifinfo); |
be7af5cf ML |
859 | |
860 | out: | |
861 | if (orig_dst_node) | |
7d211efc | 862 | batadv_orig_node_free_ref(orig_dst_node); |
be7af5cf | 863 | if (curr_gw) |
1409a834 | 864 | batadv_gw_node_free_ref(curr_gw); |
414254e3 ML |
865 | if (gw_node) |
866 | batadv_gw_node_free_ref(gw_node); | |
43676ab5 | 867 | if (neigh_old) |
7d211efc | 868 | batadv_neigh_node_free_ref(neigh_old); |
43676ab5 | 869 | if (neigh_curr) |
7d211efc | 870 | batadv_neigh_node_free_ref(neigh_curr); |
be7af5cf | 871 | return out_of_range; |
c6c8fea2 | 872 | } |