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9f6446c7 | 1 | /* Copyright (C) 2009-2015 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 | ||
c6c8fea2 | 18 | #include "gateway_client.h" |
1e2c2a4f SE |
19 | #include "main.h" |
20 | ||
21 | #include <linux/atomic.h> | |
22 | #include <linux/byteorder/generic.h> | |
23 | #include <linux/etherdevice.h> | |
24 | #include <linux/fs.h> | |
25 | #include <linux/if_ether.h> | |
26 | #include <linux/if_vlan.h> | |
27 | #include <linux/in.h> | |
28 | #include <linux/ip.h> | |
29 | #include <linux/ipv6.h> | |
30 | #include <linux/jiffies.h> | |
31 | #include <linux/kernel.h> | |
32 | #include <linux/list.h> | |
33 | #include <linux/netdevice.h> | |
34 | #include <linux/rculist.h> | |
35 | #include <linux/rcupdate.h> | |
36 | #include <linux/seq_file.h> | |
37 | #include <linux/skbuff.h> | |
38 | #include <linux/slab.h> | |
39 | #include <linux/spinlock.h> | |
40 | #include <linux/stddef.h> | |
41 | #include <linux/udp.h> | |
42 | ||
c6c8fea2 SE |
43 | #include "gateway_common.h" |
44 | #include "hard-interface.h" | |
57f0c07c | 45 | #include "originator.h" |
1e2c2a4f | 46 | #include "packet.h" |
43676ab5 | 47 | #include "routing.h" |
1e2c2a4f SE |
48 | #include "sysfs.h" |
49 | #include "translation-table.h" | |
c6c8fea2 | 50 | |
6c413b1c AQ |
51 | /* These are the offsets of the "hw type" and "hw address length" in the dhcp |
52 | * packet starting at the beginning of the dhcp header | |
9cfc7bd6 | 53 | */ |
6c413b1c AQ |
54 | #define BATADV_DHCP_HTYPE_OFFSET 1 |
55 | #define BATADV_DHCP_HLEN_OFFSET 2 | |
56 | /* Value of htype representing Ethernet */ | |
57 | #define BATADV_DHCP_HTYPE_ETHERNET 0x01 | |
58 | /* This is the offset of the "chaddr" field in the dhcp packet starting at the | |
59 | * beginning of the dhcp header | |
60 | */ | |
61 | #define BATADV_DHCP_CHADDR_OFFSET 28 | |
43676ab5 | 62 | |
56303d34 | 63 | static void batadv_gw_node_free_ref(struct batadv_gw_node *gw_node) |
c6c8fea2 | 64 | { |
377fe0f9 AQ |
65 | if (atomic_dec_and_test(&gw_node->refcount)) { |
66 | batadv_orig_node_free_ref(gw_node->orig_node); | |
eb340b2f | 67 | kfree_rcu(gw_node, rcu); |
377fe0f9 | 68 | } |
c6c8fea2 SE |
69 | } |
70 | ||
56303d34 SE |
71 | static struct batadv_gw_node * |
72 | batadv_gw_get_selected_gw_node(struct batadv_priv *bat_priv) | |
c6c8fea2 | 73 | { |
56303d34 | 74 | struct batadv_gw_node *gw_node; |
c6c8fea2 | 75 | |
5d02b3cd | 76 | rcu_read_lock(); |
807736f6 | 77 | gw_node = rcu_dereference(bat_priv->gw.curr_gw); |
c4aac1ab | 78 | if (!gw_node) |
7b36e8ee | 79 | goto out; |
c6c8fea2 | 80 | |
c4aac1ab ML |
81 | if (!atomic_inc_not_zero(&gw_node->refcount)) |
82 | gw_node = NULL; | |
43c70ad5 | 83 | |
5d02b3cd LL |
84 | out: |
85 | rcu_read_unlock(); | |
c4aac1ab | 86 | return gw_node; |
c6c8fea2 SE |
87 | } |
88 | ||
56303d34 SE |
89 | struct batadv_orig_node * |
90 | batadv_gw_get_selected_orig(struct batadv_priv *bat_priv) | |
c6c8fea2 | 91 | { |
56303d34 SE |
92 | struct batadv_gw_node *gw_node; |
93 | struct batadv_orig_node *orig_node = NULL; | |
c6c8fea2 | 94 | |
1409a834 | 95 | gw_node = batadv_gw_get_selected_gw_node(bat_priv); |
c4aac1ab ML |
96 | if (!gw_node) |
97 | goto out; | |
98 | ||
99 | rcu_read_lock(); | |
100 | orig_node = gw_node->orig_node; | |
101 | if (!orig_node) | |
102 | goto unlock; | |
103 | ||
104 | if (!atomic_inc_not_zero(&orig_node->refcount)) | |
105 | orig_node = NULL; | |
c6c8fea2 | 106 | |
c4aac1ab ML |
107 | unlock: |
108 | rcu_read_unlock(); | |
109 | out: | |
c6c8fea2 | 110 | if (gw_node) |
1409a834 | 111 | batadv_gw_node_free_ref(gw_node); |
c4aac1ab | 112 | return orig_node; |
c6c8fea2 SE |
113 | } |
114 | ||
56303d34 SE |
115 | static void batadv_gw_select(struct batadv_priv *bat_priv, |
116 | struct batadv_gw_node *new_gw_node) | |
c6c8fea2 | 117 | { |
56303d34 | 118 | struct batadv_gw_node *curr_gw_node; |
c6c8fea2 | 119 | |
807736f6 | 120 | spin_lock_bh(&bat_priv->gw.list_lock); |
c4aac1ab | 121 | |
25b6d3c1 ML |
122 | if (new_gw_node && !atomic_inc_not_zero(&new_gw_node->refcount)) |
123 | new_gw_node = NULL; | |
c6c8fea2 | 124 | |
807736f6 SE |
125 | curr_gw_node = rcu_dereference_protected(bat_priv->gw.curr_gw, 1); |
126 | rcu_assign_pointer(bat_priv->gw.curr_gw, new_gw_node); | |
25b6d3c1 ML |
127 | |
128 | if (curr_gw_node) | |
1409a834 | 129 | batadv_gw_node_free_ref(curr_gw_node); |
c4aac1ab | 130 | |
807736f6 | 131 | spin_unlock_bh(&bat_priv->gw.list_lock); |
c4aac1ab ML |
132 | } |
133 | ||
4e820e72 AQ |
134 | /** |
135 | * batadv_gw_reselect - force a gateway reselection | |
136 | * @bat_priv: the bat priv with all the soft interface information | |
137 | * | |
138 | * Set a flag to remind the GW component to perform a new gateway reselection. | |
139 | * However this function does not ensure that the current gateway is going to be | |
140 | * deselected. The reselection mechanism may elect the same gateway once again. | |
141 | * | |
142 | * This means that invoking batadv_gw_reselect() does not guarantee a gateway | |
143 | * change and therefore a uevent is not necessarily expected. | |
144 | */ | |
145 | void batadv_gw_reselect(struct batadv_priv *bat_priv) | |
c4aac1ab | 146 | { |
807736f6 | 147 | atomic_set(&bat_priv->gw.reselect, 1); |
c6c8fea2 SE |
148 | } |
149 | ||
56303d34 SE |
150 | static struct batadv_gw_node * |
151 | batadv_gw_get_best_gw_node(struct batadv_priv *bat_priv) | |
c6c8fea2 | 152 | { |
56303d34 | 153 | struct batadv_neigh_node *router; |
89652331 | 154 | struct batadv_neigh_ifinfo *router_ifinfo; |
56303d34 | 155 | struct batadv_gw_node *gw_node, *curr_gw = NULL; |
4f248cff SE |
156 | u64 max_gw_factor = 0; |
157 | u64 tmp_gw_factor = 0; | |
6b5e971a SE |
158 | u8 max_tq = 0; |
159 | u8 tq_avg; | |
56303d34 | 160 | struct batadv_orig_node *orig_node; |
c6c8fea2 | 161 | |
c4aac1ab | 162 | rcu_read_lock(); |
b67bfe0d | 163 | hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.list, list) { |
84d5e5e0 | 164 | orig_node = gw_node->orig_node; |
7351a482 | 165 | router = batadv_orig_router_get(orig_node, BATADV_IF_DEFAULT); |
e1a5382f | 166 | if (!router) |
c6c8fea2 SE |
167 | continue; |
168 | ||
89652331 SW |
169 | router_ifinfo = batadv_neigh_ifinfo_get(router, |
170 | BATADV_IF_DEFAULT); | |
171 | if (!router_ifinfo) | |
172 | goto next; | |
173 | ||
2265c141 AQ |
174 | if (!atomic_inc_not_zero(&gw_node->refcount)) |
175 | goto next; | |
176 | ||
89652331 | 177 | tq_avg = router_ifinfo->bat_iv.tq_avg; |
c67893d1 | 178 | |
c6c8fea2 SE |
179 | switch (atomic_read(&bat_priv->gw_sel_class)) { |
180 | case 1: /* fast connection */ | |
414254e3 ML |
181 | tmp_gw_factor = tq_avg * tq_avg; |
182 | tmp_gw_factor *= gw_node->bandwidth_down; | |
183 | tmp_gw_factor *= 100 * 100; | |
e071d93e | 184 | tmp_gw_factor >>= 18; |
c6c8fea2 SE |
185 | |
186 | if ((tmp_gw_factor > max_gw_factor) || | |
187 | ((tmp_gw_factor == max_gw_factor) && | |
c67893d1 | 188 | (tq_avg > max_tq))) { |
2265c141 | 189 | if (curr_gw) |
1409a834 | 190 | batadv_gw_node_free_ref(curr_gw); |
2265c141 AQ |
191 | curr_gw = gw_node; |
192 | atomic_inc(&curr_gw->refcount); | |
193 | } | |
c6c8fea2 SE |
194 | break; |
195 | ||
9cfc7bd6 | 196 | default: /* 2: stable connection (use best statistic) |
c6c8fea2 SE |
197 | * 3: fast-switch (use best statistic but change as |
198 | * soon as a better gateway appears) | |
199 | * XX: late-switch (use best statistic but change as | |
200 | * soon as a better gateway appears which has | |
201 | * $routing_class more tq points) | |
9cfc7bd6 | 202 | */ |
c67893d1 | 203 | if (tq_avg > max_tq) { |
2265c141 | 204 | if (curr_gw) |
1409a834 | 205 | batadv_gw_node_free_ref(curr_gw); |
2265c141 AQ |
206 | curr_gw = gw_node; |
207 | atomic_inc(&curr_gw->refcount); | |
208 | } | |
c6c8fea2 SE |
209 | break; |
210 | } | |
211 | ||
c67893d1 SE |
212 | if (tq_avg > max_tq) |
213 | max_tq = tq_avg; | |
c6c8fea2 SE |
214 | |
215 | if (tmp_gw_factor > max_gw_factor) | |
216 | max_gw_factor = tmp_gw_factor; | |
e1a5382f | 217 | |
1409a834 | 218 | batadv_gw_node_free_ref(gw_node); |
2265c141 AQ |
219 | |
220 | next: | |
7d211efc | 221 | batadv_neigh_node_free_ref(router); |
89652331 SW |
222 | if (router_ifinfo) |
223 | batadv_neigh_ifinfo_free_ref(router_ifinfo); | |
c6c8fea2 | 224 | } |
2265c141 | 225 | rcu_read_unlock(); |
c6c8fea2 | 226 | |
2265c141 AQ |
227 | return curr_gw; |
228 | } | |
c6c8fea2 | 229 | |
c6eaa3f0 AQ |
230 | /** |
231 | * batadv_gw_check_client_stop - check if client mode has been switched off | |
232 | * @bat_priv: the bat priv with all the soft interface information | |
233 | * | |
234 | * This function assumes the caller has checked that the gw state *is actually | |
235 | * changing*. This function is not supposed to be called when there is no state | |
236 | * change. | |
237 | */ | |
238 | void batadv_gw_check_client_stop(struct batadv_priv *bat_priv) | |
239 | { | |
240 | struct batadv_gw_node *curr_gw; | |
241 | ||
242 | if (atomic_read(&bat_priv->gw_mode) != BATADV_GW_MODE_CLIENT) | |
243 | return; | |
244 | ||
245 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); | |
246 | if (!curr_gw) | |
247 | return; | |
248 | ||
f3163181 AQ |
249 | /* deselect the current gateway so that next time that client mode is |
250 | * enabled a proper GW_ADD event can be sent | |
251 | */ | |
252 | batadv_gw_select(bat_priv, NULL); | |
253 | ||
c6eaa3f0 AQ |
254 | /* if batman-adv is switching the gw client mode off and a gateway was |
255 | * already selected, send a DEL uevent | |
256 | */ | |
257 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL, NULL); | |
258 | ||
259 | batadv_gw_node_free_ref(curr_gw); | |
260 | } | |
261 | ||
56303d34 | 262 | void batadv_gw_election(struct batadv_priv *bat_priv) |
2265c141 | 263 | { |
4f248cff SE |
264 | struct batadv_gw_node *curr_gw = NULL; |
265 | struct batadv_gw_node *next_gw = NULL; | |
56303d34 | 266 | struct batadv_neigh_node *router = NULL; |
89652331 | 267 | struct batadv_neigh_ifinfo *router_ifinfo = NULL; |
19595e05 | 268 | char gw_addr[18] = { '\0' }; |
2265c141 | 269 | |
cd646ab1 | 270 | if (atomic_read(&bat_priv->gw_mode) != BATADV_GW_MODE_CLIENT) |
2265c141 AQ |
271 | goto out; |
272 | ||
1409a834 | 273 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
2265c141 | 274 | |
807736f6 | 275 | if (!batadv_atomic_dec_not_zero(&bat_priv->gw.reselect) && curr_gw) |
caa0bf64 ML |
276 | goto out; |
277 | ||
1409a834 | 278 | next_gw = batadv_gw_get_best_gw_node(bat_priv); |
2265c141 AQ |
279 | |
280 | if (curr_gw == next_gw) | |
281 | goto out; | |
282 | ||
283 | if (next_gw) { | |
19595e05 AQ |
284 | sprintf(gw_addr, "%pM", next_gw->orig_node->orig); |
285 | ||
7351a482 SW |
286 | router = batadv_orig_router_get(next_gw->orig_node, |
287 | BATADV_IF_DEFAULT); | |
2265c141 | 288 | if (!router) { |
4e820e72 | 289 | batadv_gw_reselect(bat_priv); |
2265c141 AQ |
290 | goto out; |
291 | } | |
89652331 SW |
292 | |
293 | router_ifinfo = batadv_neigh_ifinfo_get(router, | |
294 | BATADV_IF_DEFAULT); | |
295 | if (!router_ifinfo) { | |
296 | batadv_gw_reselect(bat_priv); | |
297 | goto out; | |
298 | } | |
c6c8fea2 SE |
299 | } |
300 | ||
2265c141 | 301 | if ((curr_gw) && (!next_gw)) { |
39c75a51 | 302 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 303 | "Removing selected gateway - no gateway in range\n"); |
39c75a51 SE |
304 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL, |
305 | NULL); | |
2265c141 | 306 | } else if ((!curr_gw) && (next_gw)) { |
39c75a51 | 307 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
414254e3 | 308 | "Adding route to gateway %pM (bandwidth: %u.%u/%u.%u MBit, tq: %i)\n", |
1eda58bf | 309 | next_gw->orig_node->orig, |
414254e3 ML |
310 | next_gw->bandwidth_down / 10, |
311 | next_gw->bandwidth_down % 10, | |
312 | next_gw->bandwidth_up / 10, | |
89652331 SW |
313 | next_gw->bandwidth_up % 10, |
314 | router_ifinfo->bat_iv.tq_avg); | |
39c75a51 SE |
315 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_ADD, |
316 | gw_addr); | |
2265c141 | 317 | } else { |
39c75a51 | 318 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
414254e3 | 319 | "Changing route to gateway %pM (bandwidth: %u.%u/%u.%u MBit, tq: %i)\n", |
1eda58bf | 320 | next_gw->orig_node->orig, |
414254e3 ML |
321 | next_gw->bandwidth_down / 10, |
322 | next_gw->bandwidth_down % 10, | |
323 | next_gw->bandwidth_up / 10, | |
89652331 SW |
324 | next_gw->bandwidth_up % 10, |
325 | router_ifinfo->bat_iv.tq_avg); | |
39c75a51 SE |
326 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_CHANGE, |
327 | gw_addr); | |
2265c141 AQ |
328 | } |
329 | ||
1409a834 | 330 | batadv_gw_select(bat_priv, next_gw); |
2265c141 | 331 | |
c4aac1ab ML |
332 | out: |
333 | if (curr_gw) | |
1409a834 | 334 | batadv_gw_node_free_ref(curr_gw); |
2265c141 | 335 | if (next_gw) |
1409a834 | 336 | batadv_gw_node_free_ref(next_gw); |
2265c141 | 337 | if (router) |
7d211efc | 338 | batadv_neigh_node_free_ref(router); |
89652331 SW |
339 | if (router_ifinfo) |
340 | batadv_neigh_ifinfo_free_ref(router_ifinfo); | |
c6c8fea2 SE |
341 | } |
342 | ||
56303d34 SE |
343 | void batadv_gw_check_election(struct batadv_priv *bat_priv, |
344 | struct batadv_orig_node *orig_node) | |
c6c8fea2 | 345 | { |
89652331 SW |
346 | struct batadv_neigh_ifinfo *router_orig_tq = NULL; |
347 | struct batadv_neigh_ifinfo *router_gw_tq = NULL; | |
56303d34 | 348 | struct batadv_orig_node *curr_gw_orig; |
4f248cff SE |
349 | struct batadv_neigh_node *router_gw = NULL; |
350 | struct batadv_neigh_node *router_orig = NULL; | |
6b5e971a | 351 | u8 gw_tq_avg, orig_tq_avg; |
c6c8fea2 | 352 | |
7cf06bc6 | 353 | curr_gw_orig = batadv_gw_get_selected_orig(bat_priv); |
57f0c07c | 354 | if (!curr_gw_orig) |
4e820e72 | 355 | goto reselect; |
c6c8fea2 | 356 | |
7351a482 | 357 | router_gw = batadv_orig_router_get(curr_gw_orig, BATADV_IF_DEFAULT); |
e1a5382f | 358 | if (!router_gw) |
4e820e72 | 359 | goto reselect; |
c6c8fea2 | 360 | |
89652331 SW |
361 | router_gw_tq = batadv_neigh_ifinfo_get(router_gw, |
362 | BATADV_IF_DEFAULT); | |
363 | if (!router_gw_tq) | |
364 | goto reselect; | |
365 | ||
c6c8fea2 | 366 | /* this node already is the gateway */ |
57f0c07c | 367 | if (curr_gw_orig == orig_node) |
e1a5382f | 368 | goto out; |
c6c8fea2 | 369 | |
7351a482 | 370 | router_orig = batadv_orig_router_get(orig_node, BATADV_IF_DEFAULT); |
e1a5382f LL |
371 | if (!router_orig) |
372 | goto out; | |
5d02b3cd | 373 | |
89652331 SW |
374 | router_orig_tq = batadv_neigh_ifinfo_get(router_orig, |
375 | BATADV_IF_DEFAULT); | |
376 | if (!router_orig_tq) | |
377 | goto out; | |
378 | ||
379 | gw_tq_avg = router_gw_tq->bat_iv.tq_avg; | |
380 | orig_tq_avg = router_orig_tq->bat_iv.tq_avg; | |
c6c8fea2 SE |
381 | |
382 | /* the TQ value has to be better */ | |
383 | if (orig_tq_avg < gw_tq_avg) | |
5d02b3cd | 384 | goto out; |
c6c8fea2 | 385 | |
9cfc7bd6 | 386 | /* if the routing class is greater than 3 the value tells us how much |
c6c8fea2 | 387 | * greater the TQ value of the new gateway must be |
9cfc7bd6 | 388 | */ |
c6c8fea2 SE |
389 | if ((atomic_read(&bat_priv->gw_sel_class) > 3) && |
390 | (orig_tq_avg - gw_tq_avg < atomic_read(&bat_priv->gw_sel_class))) | |
5d02b3cd | 391 | goto out; |
c6c8fea2 | 392 | |
39c75a51 | 393 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
394 | "Restarting gateway selection: better gateway found (tq curr: %i, tq new: %i)\n", |
395 | gw_tq_avg, orig_tq_avg); | |
c6c8fea2 | 396 | |
4e820e72 AQ |
397 | reselect: |
398 | batadv_gw_reselect(bat_priv); | |
5d02b3cd | 399 | out: |
57f0c07c | 400 | if (curr_gw_orig) |
7d211efc | 401 | batadv_orig_node_free_ref(curr_gw_orig); |
e1a5382f | 402 | if (router_gw) |
7d211efc | 403 | batadv_neigh_node_free_ref(router_gw); |
e1a5382f | 404 | if (router_orig) |
7d211efc | 405 | batadv_neigh_node_free_ref(router_orig); |
89652331 SW |
406 | if (router_gw_tq) |
407 | batadv_neigh_ifinfo_free_ref(router_gw_tq); | |
408 | if (router_orig_tq) | |
409 | batadv_neigh_ifinfo_free_ref(router_orig_tq); | |
c6c8fea2 SE |
410 | } |
411 | ||
414254e3 ML |
412 | /** |
413 | * batadv_gw_node_add - add gateway node to list of available gateways | |
414 | * @bat_priv: the bat priv with all the soft interface information | |
415 | * @orig_node: originator announcing gateway capabilities | |
416 | * @gateway: announced bandwidth information | |
417 | */ | |
56303d34 SE |
418 | static void batadv_gw_node_add(struct batadv_priv *bat_priv, |
419 | struct batadv_orig_node *orig_node, | |
414254e3 | 420 | struct batadv_tvlv_gateway_data *gateway) |
c6c8fea2 | 421 | { |
56303d34 | 422 | struct batadv_gw_node *gw_node; |
414254e3 ML |
423 | |
424 | if (gateway->bandwidth_down == 0) | |
425 | return; | |
c6c8fea2 | 426 | |
377fe0f9 AQ |
427 | if (!atomic_inc_not_zero(&orig_node->refcount)) |
428 | return; | |
429 | ||
704509b8 | 430 | gw_node = kzalloc(sizeof(*gw_node), GFP_ATOMIC); |
377fe0f9 AQ |
431 | if (!gw_node) { |
432 | batadv_orig_node_free_ref(orig_node); | |
c6c8fea2 | 433 | return; |
377fe0f9 | 434 | } |
c6c8fea2 | 435 | |
c6c8fea2 SE |
436 | INIT_HLIST_NODE(&gw_node->list); |
437 | gw_node->orig_node = orig_node; | |
27a4d5ef SW |
438 | gw_node->bandwidth_down = ntohl(gateway->bandwidth_down); |
439 | gw_node->bandwidth_up = ntohl(gateway->bandwidth_up); | |
25b6d3c1 | 440 | atomic_set(&gw_node->refcount, 1); |
c6c8fea2 | 441 | |
807736f6 SE |
442 | spin_lock_bh(&bat_priv->gw.list_lock); |
443 | hlist_add_head_rcu(&gw_node->list, &bat_priv->gw.list); | |
444 | spin_unlock_bh(&bat_priv->gw.list_lock); | |
c6c8fea2 | 445 | |
39c75a51 | 446 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
414254e3 ML |
447 | "Found new gateway %pM -> gw bandwidth: %u.%u/%u.%u MBit\n", |
448 | orig_node->orig, | |
449 | ntohl(gateway->bandwidth_down) / 10, | |
450 | ntohl(gateway->bandwidth_down) % 10, | |
451 | ntohl(gateway->bandwidth_up) / 10, | |
452 | ntohl(gateway->bandwidth_up) % 10); | |
c6c8fea2 SE |
453 | } |
454 | ||
414254e3 ML |
455 | /** |
456 | * batadv_gw_node_get - retrieve gateway node from list of available gateways | |
457 | * @bat_priv: the bat priv with all the soft interface information | |
458 | * @orig_node: originator announcing gateway capabilities | |
459 | * | |
460 | * Returns gateway node if found or NULL otherwise. | |
461 | */ | |
462 | static struct batadv_gw_node * | |
463 | batadv_gw_node_get(struct batadv_priv *bat_priv, | |
464 | struct batadv_orig_node *orig_node) | |
c6c8fea2 | 465 | { |
414254e3 | 466 | struct batadv_gw_node *gw_node_tmp, *gw_node = NULL; |
c6c8fea2 SE |
467 | |
468 | rcu_read_lock(); | |
414254e3 ML |
469 | hlist_for_each_entry_rcu(gw_node_tmp, &bat_priv->gw.list, list) { |
470 | if (gw_node_tmp->orig_node != orig_node) | |
c6c8fea2 SE |
471 | continue; |
472 | ||
414254e3 ML |
473 | if (!atomic_inc_not_zero(&gw_node_tmp->refcount)) |
474 | continue; | |
c6c8fea2 | 475 | |
414254e3 ML |
476 | gw_node = gw_node_tmp; |
477 | break; | |
478 | } | |
479 | rcu_read_unlock(); | |
c6c8fea2 | 480 | |
414254e3 ML |
481 | return gw_node; |
482 | } | |
c6c8fea2 | 483 | |
414254e3 ML |
484 | /** |
485 | * batadv_gw_node_update - update list of available gateways with changed | |
486 | * bandwidth information | |
487 | * @bat_priv: the bat priv with all the soft interface information | |
488 | * @orig_node: originator announcing gateway capabilities | |
489 | * @gateway: announced bandwidth information | |
490 | */ | |
491 | void batadv_gw_node_update(struct batadv_priv *bat_priv, | |
492 | struct batadv_orig_node *orig_node, | |
493 | struct batadv_tvlv_gateway_data *gateway) | |
494 | { | |
495 | struct batadv_gw_node *gw_node, *curr_gw = NULL; | |
496 | ||
497 | gw_node = batadv_gw_node_get(bat_priv, orig_node); | |
498 | if (!gw_node) { | |
499 | batadv_gw_node_add(bat_priv, orig_node, gateway); | |
500 | goto out; | |
c6c8fea2 | 501 | } |
c6c8fea2 | 502 | |
414254e3 ML |
503 | if ((gw_node->bandwidth_down == ntohl(gateway->bandwidth_down)) && |
504 | (gw_node->bandwidth_up == ntohl(gateway->bandwidth_up))) | |
505 | goto out; | |
c6c8fea2 | 506 | |
414254e3 ML |
507 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
508 | "Gateway bandwidth of originator %pM changed from %u.%u/%u.%u MBit to %u.%u/%u.%u MBit\n", | |
509 | orig_node->orig, | |
510 | gw_node->bandwidth_down / 10, | |
511 | gw_node->bandwidth_down % 10, | |
512 | gw_node->bandwidth_up / 10, | |
513 | gw_node->bandwidth_up % 10, | |
514 | ntohl(gateway->bandwidth_down) / 10, | |
515 | ntohl(gateway->bandwidth_down) % 10, | |
516 | ntohl(gateway->bandwidth_up) / 10, | |
517 | ntohl(gateway->bandwidth_up) % 10); | |
518 | ||
519 | gw_node->bandwidth_down = ntohl(gateway->bandwidth_down); | |
520 | gw_node->bandwidth_up = ntohl(gateway->bandwidth_up); | |
521 | ||
414254e3 | 522 | if (ntohl(gateway->bandwidth_down) == 0) { |
414254e3 ML |
523 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
524 | "Gateway %pM removed from gateway list\n", | |
525 | orig_node->orig); | |
c4aac1ab | 526 | |
414254e3 ML |
527 | /* Note: We don't need a NULL check here, since curr_gw never |
528 | * gets dereferenced. | |
529 | */ | |
bd3524c1 SW |
530 | spin_lock_bh(&bat_priv->gw.list_lock); |
531 | hlist_del_init_rcu(&gw_node->list); | |
532 | spin_unlock_bh(&bat_priv->gw.list_lock); | |
533 | ||
534 | batadv_gw_node_free_ref(gw_node); | |
535 | ||
414254e3 ML |
536 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
537 | if (gw_node == curr_gw) | |
4e820e72 | 538 | batadv_gw_reselect(bat_priv); |
bd3524c1 SW |
539 | |
540 | if (curr_gw) | |
541 | batadv_gw_node_free_ref(curr_gw); | |
414254e3 | 542 | } |
71e4aa9c | 543 | |
414254e3 | 544 | out: |
414254e3 ML |
545 | if (gw_node) |
546 | batadv_gw_node_free_ref(gw_node); | |
c6c8fea2 SE |
547 | } |
548 | ||
56303d34 SE |
549 | void batadv_gw_node_delete(struct batadv_priv *bat_priv, |
550 | struct batadv_orig_node *orig_node) | |
c6c8fea2 | 551 | { |
414254e3 ML |
552 | struct batadv_tvlv_gateway_data gateway; |
553 | ||
554 | gateway.bandwidth_down = 0; | |
555 | gateway.bandwidth_up = 0; | |
556 | ||
557 | batadv_gw_node_update(bat_priv, orig_node, &gateway); | |
c6c8fea2 SE |
558 | } |
559 | ||
bd3524c1 | 560 | void batadv_gw_node_free(struct batadv_priv *bat_priv) |
c6c8fea2 | 561 | { |
bd3524c1 | 562 | struct batadv_gw_node *gw_node; |
b67bfe0d | 563 | struct hlist_node *node_tmp; |
c6c8fea2 | 564 | |
807736f6 | 565 | spin_lock_bh(&bat_priv->gw.list_lock); |
b67bfe0d | 566 | hlist_for_each_entry_safe(gw_node, node_tmp, |
807736f6 | 567 | &bat_priv->gw.list, list) { |
c6c8fea2 | 568 | |
bd3524c1 | 569 | hlist_del_init_rcu(&gw_node->list); |
1409a834 | 570 | batadv_gw_node_free_ref(gw_node); |
c6c8fea2 | 571 | } |
807736f6 | 572 | spin_unlock_bh(&bat_priv->gw.list_lock); |
c6c8fea2 SE |
573 | } |
574 | ||
9cfc7bd6 | 575 | /* fails if orig_node has no router */ |
56303d34 SE |
576 | static int batadv_write_buffer_text(struct batadv_priv *bat_priv, |
577 | struct seq_file *seq, | |
578 | const struct batadv_gw_node *gw_node) | |
c6c8fea2 | 579 | { |
56303d34 SE |
580 | struct batadv_gw_node *curr_gw; |
581 | struct batadv_neigh_node *router; | |
89652331 | 582 | struct batadv_neigh_ifinfo *router_ifinfo = NULL; |
414254e3 | 583 | int ret = -1; |
c6c8fea2 | 584 | |
7351a482 | 585 | router = batadv_orig_router_get(gw_node->orig_node, BATADV_IF_DEFAULT); |
e1a5382f LL |
586 | if (!router) |
587 | goto out; | |
5d02b3cd | 588 | |
89652331 SW |
589 | router_ifinfo = batadv_neigh_ifinfo_get(router, BATADV_IF_DEFAULT); |
590 | if (!router_ifinfo) | |
591 | goto out; | |
592 | ||
1409a834 | 593 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
5d02b3cd | 594 | |
6d91147d JP |
595 | seq_printf(seq, "%s %pM (%3i) %pM [%10s]: %u.%u/%u.%u MBit\n", |
596 | (curr_gw == gw_node ? "=>" : " "), | |
597 | gw_node->orig_node->orig, | |
598 | router_ifinfo->bat_iv.tq_avg, router->addr, | |
599 | router->if_incoming->net_dev->name, | |
600 | gw_node->bandwidth_down / 10, | |
601 | gw_node->bandwidth_down % 10, | |
602 | gw_node->bandwidth_up / 10, | |
603 | gw_node->bandwidth_up % 10); | |
92b83917 | 604 | ret = seq_has_overflowed(seq) ? -1 : 0; |
5d02b3cd | 605 | |
c4aac1ab | 606 | if (curr_gw) |
1409a834 | 607 | batadv_gw_node_free_ref(curr_gw); |
e1a5382f | 608 | out: |
89652331 SW |
609 | if (router_ifinfo) |
610 | batadv_neigh_ifinfo_free_ref(router_ifinfo); | |
611 | if (router) | |
612 | batadv_neigh_node_free_ref(router); | |
5d02b3cd | 613 | return ret; |
c6c8fea2 SE |
614 | } |
615 | ||
7cf06bc6 | 616 | int batadv_gw_client_seq_print_text(struct seq_file *seq, void *offset) |
c6c8fea2 SE |
617 | { |
618 | struct net_device *net_dev = (struct net_device *)seq->private; | |
56303d34 SE |
619 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
620 | struct batadv_hard_iface *primary_if; | |
621 | struct batadv_gw_node *gw_node; | |
30da63a6 | 622 | int gw_count = 0; |
c6c8fea2 | 623 | |
30da63a6 ML |
624 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
625 | if (!primary_if) | |
32ae9b22 | 626 | goto out; |
c6c8fea2 | 627 | |
86ceb360 | 628 | seq_printf(seq, |
414254e3 | 629 | " %-12s (%s/%i) %17s [%10s]: advertised uplink bandwidth ... [B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s)]\n", |
42d0b044 SE |
630 | "Gateway", "#", BATADV_TQ_MAX_VALUE, "Nexthop", "outgoingIF", |
631 | BATADV_SOURCE_VERSION, primary_if->net_dev->name, | |
32ae9b22 | 632 | primary_if->net_dev->dev_addr, net_dev->name); |
c6c8fea2 SE |
633 | |
634 | rcu_read_lock(); | |
b67bfe0d | 635 | hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.list, list) { |
e1a5382f | 636 | /* fails if orig_node has no router */ |
1409a834 | 637 | if (batadv_write_buffer_text(bat_priv, seq, gw_node) < 0) |
c6c8fea2 SE |
638 | continue; |
639 | ||
c6c8fea2 SE |
640 | gw_count++; |
641 | } | |
642 | rcu_read_unlock(); | |
643 | ||
644 | if (gw_count == 0) | |
0c814653 | 645 | seq_puts(seq, "No gateways in range ...\n"); |
c6c8fea2 | 646 | |
32ae9b22 ML |
647 | out: |
648 | if (primary_if) | |
e5d89254 | 649 | batadv_hardif_free_ref(primary_if); |
30da63a6 | 650 | return 0; |
c6c8fea2 SE |
651 | } |
652 | ||
6c413b1c AQ |
653 | /** |
654 | * batadv_gw_dhcp_recipient_get - check if a packet is a DHCP message | |
655 | * @skb: the packet to check | |
656 | * @header_len: a pointer to the batman-adv header size | |
657 | * @chaddr: buffer where the client address will be stored. Valid | |
658 | * only if the function returns BATADV_DHCP_TO_CLIENT | |
659 | * | |
660 | * Returns: | |
661 | * - BATADV_DHCP_NO if the packet is not a dhcp message or if there was an error | |
662 | * while parsing it | |
663 | * - BATADV_DHCP_TO_SERVER if this is a message going to the DHCP server | |
664 | * - BATADV_DHCP_TO_CLIENT if this is a message going to a DHCP client | |
665 | * | |
666 | * This function may re-allocate the data buffer of the skb passed as argument. | |
667 | */ | |
668 | enum batadv_dhcp_recipient | |
669 | batadv_gw_dhcp_recipient_get(struct sk_buff *skb, unsigned int *header_len, | |
6b5e971a | 670 | u8 *chaddr) |
c6c8fea2 | 671 | { |
6c413b1c | 672 | enum batadv_dhcp_recipient ret = BATADV_DHCP_NO; |
c6c8fea2 SE |
673 | struct ethhdr *ethhdr; |
674 | struct iphdr *iphdr; | |
675 | struct ipv6hdr *ipv6hdr; | |
676 | struct udphdr *udphdr; | |
f7f8ed56 | 677 | struct vlan_ethhdr *vhdr; |
6c413b1c | 678 | int chaddr_offset; |
f7f8ed56 | 679 | __be16 proto; |
6b5e971a | 680 | u8 *p; |
c6c8fea2 SE |
681 | |
682 | /* check for ethernet header */ | |
be7af5cf | 683 | if (!pskb_may_pull(skb, *header_len + ETH_HLEN)) |
6c413b1c AQ |
684 | return BATADV_DHCP_NO; |
685 | ||
927c2ed7 | 686 | ethhdr = eth_hdr(skb); |
f7f8ed56 | 687 | proto = ethhdr->h_proto; |
be7af5cf | 688 | *header_len += ETH_HLEN; |
c6c8fea2 SE |
689 | |
690 | /* check for initial vlan header */ | |
f7f8ed56 | 691 | if (proto == htons(ETH_P_8021Q)) { |
be7af5cf | 692 | if (!pskb_may_pull(skb, *header_len + VLAN_HLEN)) |
6c413b1c | 693 | return BATADV_DHCP_NO; |
f7f8ed56 | 694 | |
927c2ed7 | 695 | vhdr = vlan_eth_hdr(skb); |
f7f8ed56 | 696 | proto = vhdr->h_vlan_encapsulated_proto; |
be7af5cf | 697 | *header_len += VLAN_HLEN; |
c6c8fea2 SE |
698 | } |
699 | ||
700 | /* check for ip header */ | |
f7f8ed56 AQ |
701 | switch (proto) { |
702 | case htons(ETH_P_IP): | |
be7af5cf | 703 | if (!pskb_may_pull(skb, *header_len + sizeof(*iphdr))) |
6c413b1c AQ |
704 | return BATADV_DHCP_NO; |
705 | ||
be7af5cf ML |
706 | iphdr = (struct iphdr *)(skb->data + *header_len); |
707 | *header_len += iphdr->ihl * 4; | |
c6c8fea2 SE |
708 | |
709 | /* check for udp header */ | |
710 | if (iphdr->protocol != IPPROTO_UDP) | |
6c413b1c | 711 | return BATADV_DHCP_NO; |
c6c8fea2 SE |
712 | |
713 | break; | |
f7f8ed56 | 714 | case htons(ETH_P_IPV6): |
be7af5cf | 715 | if (!pskb_may_pull(skb, *header_len + sizeof(*ipv6hdr))) |
6c413b1c AQ |
716 | return BATADV_DHCP_NO; |
717 | ||
be7af5cf ML |
718 | ipv6hdr = (struct ipv6hdr *)(skb->data + *header_len); |
719 | *header_len += sizeof(*ipv6hdr); | |
c6c8fea2 SE |
720 | |
721 | /* check for udp header */ | |
722 | if (ipv6hdr->nexthdr != IPPROTO_UDP) | |
6c413b1c | 723 | return BATADV_DHCP_NO; |
c6c8fea2 SE |
724 | |
725 | break; | |
726 | default: | |
6c413b1c | 727 | return BATADV_DHCP_NO; |
c6c8fea2 SE |
728 | } |
729 | ||
be7af5cf | 730 | if (!pskb_may_pull(skb, *header_len + sizeof(*udphdr))) |
6c413b1c | 731 | return BATADV_DHCP_NO; |
9d2c9488 | 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 | } |
aa143d28 | 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 | { |
4f248cff SE |
790 | struct batadv_neigh_node *neigh_curr = NULL; |
791 | struct batadv_neigh_node *neigh_old = NULL; | |
56303d34 | 792 | struct batadv_orig_node *orig_dst_node = NULL; |
4f248cff SE |
793 | struct batadv_gw_node *gw_node = NULL; |
794 | struct batadv_gw_node *curr_gw = NULL; | |
89652331 | 795 | struct batadv_neigh_ifinfo *curr_ifinfo, *old_ifinfo; |
6c413b1c AQ |
796 | struct ethhdr *ethhdr = (struct ethhdr *)skb->data; |
797 | bool out_of_range = false; | |
6b5e971a | 798 | u8 curr_tq_avg; |
bbb877ed AQ |
799 | unsigned short vid; |
800 | ||
801 | vid = batadv_get_vid(skb, 0); | |
be7af5cf | 802 | |
08c36d3e | 803 | orig_dst_node = batadv_transtable_search(bat_priv, ethhdr->h_source, |
bbb877ed | 804 | ethhdr->h_dest, vid); |
be7af5cf ML |
805 | if (!orig_dst_node) |
806 | goto out; | |
807 | ||
414254e3 | 808 | gw_node = batadv_gw_node_get(bat_priv, orig_dst_node); |
0d164491 | 809 | if (!gw_node) |
be7af5cf ML |
810 | goto out; |
811 | ||
be7af5cf | 812 | switch (atomic_read(&bat_priv->gw_mode)) { |
cd646ab1 | 813 | case BATADV_GW_MODE_SERVER: |
be7af5cf | 814 | /* If we are a GW then we are our best GW. We can artificially |
9cfc7bd6 SE |
815 | * set the tq towards ourself as the maximum value |
816 | */ | |
42d0b044 | 817 | curr_tq_avg = BATADV_TQ_MAX_VALUE; |
be7af5cf | 818 | break; |
cd646ab1 | 819 | case BATADV_GW_MODE_CLIENT: |
1409a834 | 820 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
be7af5cf ML |
821 | if (!curr_gw) |
822 | goto out; | |
823 | ||
824 | /* packet is going to our gateway */ | |
825 | if (curr_gw->orig_node == orig_dst_node) | |
826 | goto out; | |
827 | ||
828 | /* If the dhcp packet has been sent to a different gw, | |
829 | * we have to evaluate whether the old gw is still | |
9cfc7bd6 SE |
830 | * reliable enough |
831 | */ | |
30d3c511 SE |
832 | neigh_curr = batadv_find_router(bat_priv, curr_gw->orig_node, |
833 | NULL); | |
be7af5cf ML |
834 | if (!neigh_curr) |
835 | goto out; | |
836 | ||
89652331 SW |
837 | curr_ifinfo = batadv_neigh_ifinfo_get(neigh_curr, |
838 | BATADV_IF_DEFAULT); | |
839 | if (!curr_ifinfo) | |
840 | goto out; | |
841 | ||
842 | curr_tq_avg = curr_ifinfo->bat_iv.tq_avg; | |
843 | batadv_neigh_ifinfo_free_ref(curr_ifinfo); | |
844 | ||
be7af5cf | 845 | break; |
cd646ab1 | 846 | case BATADV_GW_MODE_OFF: |
be7af5cf ML |
847 | default: |
848 | goto out; | |
43676ab5 | 849 | } |
be7af5cf | 850 | |
30d3c511 | 851 | neigh_old = batadv_find_router(bat_priv, orig_dst_node, NULL); |
2ef04f47 | 852 | if (!neigh_old) |
be7af5cf ML |
853 | goto out; |
854 | ||
89652331 SW |
855 | old_ifinfo = batadv_neigh_ifinfo_get(neigh_old, BATADV_IF_DEFAULT); |
856 | if (!old_ifinfo) | |
857 | goto out; | |
858 | ||
859 | if ((curr_tq_avg - old_ifinfo->bat_iv.tq_avg) > BATADV_GW_THRESHOLD) | |
be7af5cf | 860 | out_of_range = true; |
89652331 | 861 | batadv_neigh_ifinfo_free_ref(old_ifinfo); |
be7af5cf ML |
862 | |
863 | out: | |
864 | if (orig_dst_node) | |
7d211efc | 865 | batadv_orig_node_free_ref(orig_dst_node); |
be7af5cf | 866 | if (curr_gw) |
1409a834 | 867 | batadv_gw_node_free_ref(curr_gw); |
414254e3 ML |
868 | if (gw_node) |
869 | batadv_gw_node_free_ref(gw_node); | |
43676ab5 | 870 | if (neigh_old) |
7d211efc | 871 | batadv_neigh_node_free_ref(neigh_old); |
43676ab5 | 872 | if (neigh_curr) |
7d211efc | 873 | batadv_neigh_node_free_ref(neigh_curr); |
be7af5cf | 874 | return out_of_range; |
c6c8fea2 | 875 | } |