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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> | |
1e2c2a4f SE |
30 | #include <linux/kernel.h> |
31 | #include <linux/list.h> | |
32 | #include <linux/netdevice.h> | |
33 | #include <linux/rculist.h> | |
34 | #include <linux/rcupdate.h> | |
35 | #include <linux/seq_file.h> | |
36 | #include <linux/skbuff.h> | |
37 | #include <linux/slab.h> | |
38 | #include <linux/spinlock.h> | |
39 | #include <linux/stddef.h> | |
40 | #include <linux/udp.h> | |
41 | ||
c6c8fea2 SE |
42 | #include "gateway_common.h" |
43 | #include "hard-interface.h" | |
57f0c07c | 44 | #include "originator.h" |
1e2c2a4f | 45 | #include "packet.h" |
43676ab5 | 46 | #include "routing.h" |
1e2c2a4f SE |
47 | #include "sysfs.h" |
48 | #include "translation-table.h" | |
c6c8fea2 | 49 | |
6c413b1c AQ |
50 | /* These are the offsets of the "hw type" and "hw address length" in the dhcp |
51 | * packet starting at the beginning of the dhcp header | |
9cfc7bd6 | 52 | */ |
6c413b1c AQ |
53 | #define BATADV_DHCP_HTYPE_OFFSET 1 |
54 | #define BATADV_DHCP_HLEN_OFFSET 2 | |
55 | /* Value of htype representing Ethernet */ | |
56 | #define BATADV_DHCP_HTYPE_ETHERNET 0x01 | |
57 | /* This is the offset of the "chaddr" field in the dhcp packet starting at the | |
58 | * beginning of the dhcp header | |
59 | */ | |
60 | #define BATADV_DHCP_CHADDR_OFFSET 28 | |
43676ab5 | 61 | |
56303d34 | 62 | static void batadv_gw_node_free_ref(struct batadv_gw_node *gw_node) |
c6c8fea2 | 63 | { |
377fe0f9 AQ |
64 | if (atomic_dec_and_test(&gw_node->refcount)) { |
65 | batadv_orig_node_free_ref(gw_node->orig_node); | |
eb340b2f | 66 | kfree_rcu(gw_node, rcu); |
377fe0f9 | 67 | } |
c6c8fea2 SE |
68 | } |
69 | ||
56303d34 SE |
70 | static struct batadv_gw_node * |
71 | batadv_gw_get_selected_gw_node(struct batadv_priv *bat_priv) | |
c6c8fea2 | 72 | { |
56303d34 | 73 | struct batadv_gw_node *gw_node; |
c6c8fea2 | 74 | |
5d02b3cd | 75 | rcu_read_lock(); |
807736f6 | 76 | gw_node = rcu_dereference(bat_priv->gw.curr_gw); |
c4aac1ab | 77 | if (!gw_node) |
7b36e8ee | 78 | goto out; |
c6c8fea2 | 79 | |
c4aac1ab ML |
80 | if (!atomic_inc_not_zero(&gw_node->refcount)) |
81 | gw_node = NULL; | |
43c70ad5 | 82 | |
5d02b3cd LL |
83 | out: |
84 | rcu_read_unlock(); | |
c4aac1ab | 85 | return gw_node; |
c6c8fea2 SE |
86 | } |
87 | ||
56303d34 SE |
88 | struct batadv_orig_node * |
89 | batadv_gw_get_selected_orig(struct batadv_priv *bat_priv) | |
c6c8fea2 | 90 | { |
56303d34 SE |
91 | struct batadv_gw_node *gw_node; |
92 | struct batadv_orig_node *orig_node = NULL; | |
c6c8fea2 | 93 | |
1409a834 | 94 | gw_node = batadv_gw_get_selected_gw_node(bat_priv); |
c4aac1ab ML |
95 | if (!gw_node) |
96 | goto out; | |
97 | ||
98 | rcu_read_lock(); | |
99 | orig_node = gw_node->orig_node; | |
100 | if (!orig_node) | |
101 | goto unlock; | |
102 | ||
103 | if (!atomic_inc_not_zero(&orig_node->refcount)) | |
104 | orig_node = NULL; | |
c6c8fea2 | 105 | |
c4aac1ab ML |
106 | unlock: |
107 | rcu_read_unlock(); | |
108 | out: | |
c6c8fea2 | 109 | if (gw_node) |
1409a834 | 110 | batadv_gw_node_free_ref(gw_node); |
c4aac1ab | 111 | return orig_node; |
c6c8fea2 SE |
112 | } |
113 | ||
56303d34 SE |
114 | static void batadv_gw_select(struct batadv_priv *bat_priv, |
115 | struct batadv_gw_node *new_gw_node) | |
c6c8fea2 | 116 | { |
56303d34 | 117 | struct batadv_gw_node *curr_gw_node; |
c6c8fea2 | 118 | |
807736f6 | 119 | spin_lock_bh(&bat_priv->gw.list_lock); |
c4aac1ab | 120 | |
25b6d3c1 ML |
121 | if (new_gw_node && !atomic_inc_not_zero(&new_gw_node->refcount)) |
122 | new_gw_node = NULL; | |
c6c8fea2 | 123 | |
807736f6 SE |
124 | curr_gw_node = rcu_dereference_protected(bat_priv->gw.curr_gw, 1); |
125 | rcu_assign_pointer(bat_priv->gw.curr_gw, new_gw_node); | |
25b6d3c1 ML |
126 | |
127 | if (curr_gw_node) | |
1409a834 | 128 | batadv_gw_node_free_ref(curr_gw_node); |
c4aac1ab | 129 | |
807736f6 | 130 | spin_unlock_bh(&bat_priv->gw.list_lock); |
c4aac1ab ML |
131 | } |
132 | ||
4e820e72 AQ |
133 | /** |
134 | * batadv_gw_reselect - force a gateway reselection | |
135 | * @bat_priv: the bat priv with all the soft interface information | |
136 | * | |
137 | * Set a flag to remind the GW component to perform a new gateway reselection. | |
138 | * However this function does not ensure that the current gateway is going to be | |
139 | * deselected. The reselection mechanism may elect the same gateway once again. | |
140 | * | |
141 | * This means that invoking batadv_gw_reselect() does not guarantee a gateway | |
142 | * change and therefore a uevent is not necessarily expected. | |
143 | */ | |
144 | void batadv_gw_reselect(struct batadv_priv *bat_priv) | |
c4aac1ab | 145 | { |
807736f6 | 146 | atomic_set(&bat_priv->gw.reselect, 1); |
c6c8fea2 SE |
147 | } |
148 | ||
56303d34 SE |
149 | static struct batadv_gw_node * |
150 | batadv_gw_get_best_gw_node(struct batadv_priv *bat_priv) | |
c6c8fea2 | 151 | { |
56303d34 | 152 | struct batadv_neigh_node *router; |
89652331 | 153 | struct batadv_neigh_ifinfo *router_ifinfo; |
56303d34 | 154 | struct batadv_gw_node *gw_node, *curr_gw = NULL; |
4f248cff SE |
155 | u64 max_gw_factor = 0; |
156 | u64 tmp_gw_factor = 0; | |
6b5e971a SE |
157 | u8 max_tq = 0; |
158 | u8 tq_avg; | |
56303d34 | 159 | struct batadv_orig_node *orig_node; |
c6c8fea2 | 160 | |
c4aac1ab | 161 | rcu_read_lock(); |
b67bfe0d | 162 | hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.list, list) { |
84d5e5e0 | 163 | orig_node = gw_node->orig_node; |
7351a482 | 164 | router = batadv_orig_router_get(orig_node, BATADV_IF_DEFAULT); |
e1a5382f | 165 | if (!router) |
c6c8fea2 SE |
166 | continue; |
167 | ||
89652331 SW |
168 | router_ifinfo = batadv_neigh_ifinfo_get(router, |
169 | BATADV_IF_DEFAULT); | |
170 | if (!router_ifinfo) | |
171 | goto next; | |
172 | ||
2265c141 AQ |
173 | if (!atomic_inc_not_zero(&gw_node->refcount)) |
174 | goto next; | |
175 | ||
89652331 | 176 | tq_avg = router_ifinfo->bat_iv.tq_avg; |
c67893d1 | 177 | |
c6c8fea2 SE |
178 | switch (atomic_read(&bat_priv->gw_sel_class)) { |
179 | case 1: /* fast connection */ | |
414254e3 ML |
180 | tmp_gw_factor = tq_avg * tq_avg; |
181 | tmp_gw_factor *= gw_node->bandwidth_down; | |
182 | tmp_gw_factor *= 100 * 100; | |
e071d93e | 183 | tmp_gw_factor >>= 18; |
c6c8fea2 SE |
184 | |
185 | if ((tmp_gw_factor > max_gw_factor) || | |
186 | ((tmp_gw_factor == max_gw_factor) && | |
c67893d1 | 187 | (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 | ||
9cfc7bd6 | 195 | default: /* 2: stable connection (use best statistic) |
c6c8fea2 SE |
196 | * 3: fast-switch (use best statistic but change as |
197 | * soon as a better gateway appears) | |
198 | * XX: late-switch (use best statistic but change as | |
199 | * soon as a better gateway appears which has | |
200 | * $routing_class more tq points) | |
9cfc7bd6 | 201 | */ |
c67893d1 | 202 | if (tq_avg > max_tq) { |
2265c141 | 203 | if (curr_gw) |
1409a834 | 204 | batadv_gw_node_free_ref(curr_gw); |
2265c141 AQ |
205 | curr_gw = gw_node; |
206 | atomic_inc(&curr_gw->refcount); | |
207 | } | |
c6c8fea2 SE |
208 | break; |
209 | } | |
210 | ||
c67893d1 SE |
211 | if (tq_avg > max_tq) |
212 | max_tq = tq_avg; | |
c6c8fea2 SE |
213 | |
214 | if (tmp_gw_factor > max_gw_factor) | |
215 | max_gw_factor = tmp_gw_factor; | |
e1a5382f | 216 | |
1409a834 | 217 | batadv_gw_node_free_ref(gw_node); |
2265c141 AQ |
218 | |
219 | next: | |
7d211efc | 220 | batadv_neigh_node_free_ref(router); |
89652331 SW |
221 | if (router_ifinfo) |
222 | batadv_neigh_ifinfo_free_ref(router_ifinfo); | |
c6c8fea2 | 223 | } |
2265c141 | 224 | rcu_read_unlock(); |
c6c8fea2 | 225 | |
2265c141 AQ |
226 | return curr_gw; |
227 | } | |
c6c8fea2 | 228 | |
c6eaa3f0 AQ |
229 | /** |
230 | * batadv_gw_check_client_stop - check if client mode has been switched off | |
231 | * @bat_priv: the bat priv with all the soft interface information | |
232 | * | |
233 | * This function assumes the caller has checked that the gw state *is actually | |
234 | * changing*. This function is not supposed to be called when there is no state | |
235 | * change. | |
236 | */ | |
237 | void batadv_gw_check_client_stop(struct batadv_priv *bat_priv) | |
238 | { | |
239 | struct batadv_gw_node *curr_gw; | |
240 | ||
241 | if (atomic_read(&bat_priv->gw_mode) != BATADV_GW_MODE_CLIENT) | |
242 | return; | |
243 | ||
244 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); | |
245 | if (!curr_gw) | |
246 | return; | |
247 | ||
f3163181 AQ |
248 | /* deselect the current gateway so that next time that client mode is |
249 | * enabled a proper GW_ADD event can be sent | |
250 | */ | |
251 | batadv_gw_select(bat_priv, NULL); | |
252 | ||
c6eaa3f0 AQ |
253 | /* if batman-adv is switching the gw client mode off and a gateway was |
254 | * already selected, send a DEL uevent | |
255 | */ | |
256 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL, NULL); | |
257 | ||
258 | batadv_gw_node_free_ref(curr_gw); | |
259 | } | |
260 | ||
56303d34 | 261 | void batadv_gw_election(struct batadv_priv *bat_priv) |
2265c141 | 262 | { |
4f248cff SE |
263 | struct batadv_gw_node *curr_gw = NULL; |
264 | struct batadv_gw_node *next_gw = NULL; | |
56303d34 | 265 | struct batadv_neigh_node *router = NULL; |
89652331 | 266 | struct batadv_neigh_ifinfo *router_ifinfo = NULL; |
19595e05 | 267 | char gw_addr[18] = { '\0' }; |
2265c141 | 268 | |
cd646ab1 | 269 | if (atomic_read(&bat_priv->gw_mode) != BATADV_GW_MODE_CLIENT) |
2265c141 AQ |
270 | goto out; |
271 | ||
1409a834 | 272 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
2265c141 | 273 | |
807736f6 | 274 | if (!batadv_atomic_dec_not_zero(&bat_priv->gw.reselect) && curr_gw) |
caa0bf64 ML |
275 | goto out; |
276 | ||
1409a834 | 277 | next_gw = batadv_gw_get_best_gw_node(bat_priv); |
2265c141 AQ |
278 | |
279 | if (curr_gw == next_gw) | |
280 | goto out; | |
281 | ||
282 | if (next_gw) { | |
19595e05 AQ |
283 | sprintf(gw_addr, "%pM", next_gw->orig_node->orig); |
284 | ||
7351a482 SW |
285 | router = batadv_orig_router_get(next_gw->orig_node, |
286 | BATADV_IF_DEFAULT); | |
2265c141 | 287 | if (!router) { |
4e820e72 | 288 | batadv_gw_reselect(bat_priv); |
2265c141 AQ |
289 | goto out; |
290 | } | |
89652331 SW |
291 | |
292 | router_ifinfo = batadv_neigh_ifinfo_get(router, | |
293 | BATADV_IF_DEFAULT); | |
294 | if (!router_ifinfo) { | |
295 | batadv_gw_reselect(bat_priv); | |
296 | goto out; | |
297 | } | |
c6c8fea2 SE |
298 | } |
299 | ||
2265c141 | 300 | if ((curr_gw) && (!next_gw)) { |
39c75a51 | 301 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 302 | "Removing selected gateway - no gateway in range\n"); |
39c75a51 SE |
303 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL, |
304 | NULL); | |
2265c141 | 305 | } else if ((!curr_gw) && (next_gw)) { |
39c75a51 | 306 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
414254e3 | 307 | "Adding route to gateway %pM (bandwidth: %u.%u/%u.%u MBit, tq: %i)\n", |
1eda58bf | 308 | next_gw->orig_node->orig, |
414254e3 ML |
309 | next_gw->bandwidth_down / 10, |
310 | next_gw->bandwidth_down % 10, | |
311 | next_gw->bandwidth_up / 10, | |
89652331 SW |
312 | next_gw->bandwidth_up % 10, |
313 | router_ifinfo->bat_iv.tq_avg); | |
39c75a51 SE |
314 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_ADD, |
315 | gw_addr); | |
2265c141 | 316 | } else { |
39c75a51 | 317 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
414254e3 | 318 | "Changing route to gateway %pM (bandwidth: %u.%u/%u.%u MBit, tq: %i)\n", |
1eda58bf | 319 | next_gw->orig_node->orig, |
414254e3 ML |
320 | next_gw->bandwidth_down / 10, |
321 | next_gw->bandwidth_down % 10, | |
322 | next_gw->bandwidth_up / 10, | |
89652331 SW |
323 | next_gw->bandwidth_up % 10, |
324 | router_ifinfo->bat_iv.tq_avg); | |
39c75a51 SE |
325 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_CHANGE, |
326 | gw_addr); | |
2265c141 AQ |
327 | } |
328 | ||
1409a834 | 329 | batadv_gw_select(bat_priv, next_gw); |
2265c141 | 330 | |
c4aac1ab ML |
331 | out: |
332 | if (curr_gw) | |
1409a834 | 333 | batadv_gw_node_free_ref(curr_gw); |
2265c141 | 334 | if (next_gw) |
1409a834 | 335 | batadv_gw_node_free_ref(next_gw); |
2265c141 | 336 | if (router) |
7d211efc | 337 | batadv_neigh_node_free_ref(router); |
89652331 SW |
338 | if (router_ifinfo) |
339 | batadv_neigh_ifinfo_free_ref(router_ifinfo); | |
c6c8fea2 SE |
340 | } |
341 | ||
56303d34 SE |
342 | void batadv_gw_check_election(struct batadv_priv *bat_priv, |
343 | struct batadv_orig_node *orig_node) | |
c6c8fea2 | 344 | { |
89652331 SW |
345 | struct batadv_neigh_ifinfo *router_orig_tq = NULL; |
346 | struct batadv_neigh_ifinfo *router_gw_tq = NULL; | |
56303d34 | 347 | struct batadv_orig_node *curr_gw_orig; |
4f248cff SE |
348 | struct batadv_neigh_node *router_gw = NULL; |
349 | struct batadv_neigh_node *router_orig = NULL; | |
6b5e971a | 350 | u8 gw_tq_avg, orig_tq_avg; |
c6c8fea2 | 351 | |
7cf06bc6 | 352 | curr_gw_orig = batadv_gw_get_selected_orig(bat_priv); |
57f0c07c | 353 | if (!curr_gw_orig) |
4e820e72 | 354 | goto reselect; |
c6c8fea2 | 355 | |
7351a482 | 356 | router_gw = batadv_orig_router_get(curr_gw_orig, BATADV_IF_DEFAULT); |
e1a5382f | 357 | if (!router_gw) |
4e820e72 | 358 | goto reselect; |
c6c8fea2 | 359 | |
89652331 SW |
360 | router_gw_tq = batadv_neigh_ifinfo_get(router_gw, |
361 | BATADV_IF_DEFAULT); | |
362 | if (!router_gw_tq) | |
363 | goto reselect; | |
364 | ||
c6c8fea2 | 365 | /* this node already is the gateway */ |
57f0c07c | 366 | if (curr_gw_orig == orig_node) |
e1a5382f | 367 | goto out; |
c6c8fea2 | 368 | |
7351a482 | 369 | router_orig = batadv_orig_router_get(orig_node, BATADV_IF_DEFAULT); |
e1a5382f LL |
370 | if (!router_orig) |
371 | goto out; | |
5d02b3cd | 372 | |
89652331 SW |
373 | router_orig_tq = batadv_neigh_ifinfo_get(router_orig, |
374 | BATADV_IF_DEFAULT); | |
375 | if (!router_orig_tq) | |
376 | goto out; | |
377 | ||
378 | gw_tq_avg = router_gw_tq->bat_iv.tq_avg; | |
379 | orig_tq_avg = router_orig_tq->bat_iv.tq_avg; | |
c6c8fea2 SE |
380 | |
381 | /* the TQ value has to be better */ | |
382 | if (orig_tq_avg < gw_tq_avg) | |
5d02b3cd | 383 | goto out; |
c6c8fea2 | 384 | |
9cfc7bd6 | 385 | /* if the routing class is greater than 3 the value tells us how much |
c6c8fea2 | 386 | * greater the TQ value of the new gateway must be |
9cfc7bd6 | 387 | */ |
c6c8fea2 SE |
388 | if ((atomic_read(&bat_priv->gw_sel_class) > 3) && |
389 | (orig_tq_avg - gw_tq_avg < atomic_read(&bat_priv->gw_sel_class))) | |
5d02b3cd | 390 | goto out; |
c6c8fea2 | 391 | |
39c75a51 | 392 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
393 | "Restarting gateway selection: better gateway found (tq curr: %i, tq new: %i)\n", |
394 | gw_tq_avg, orig_tq_avg); | |
c6c8fea2 | 395 | |
4e820e72 AQ |
396 | reselect: |
397 | batadv_gw_reselect(bat_priv); | |
5d02b3cd | 398 | out: |
57f0c07c | 399 | if (curr_gw_orig) |
7d211efc | 400 | batadv_orig_node_free_ref(curr_gw_orig); |
e1a5382f | 401 | if (router_gw) |
7d211efc | 402 | batadv_neigh_node_free_ref(router_gw); |
e1a5382f | 403 | if (router_orig) |
7d211efc | 404 | batadv_neigh_node_free_ref(router_orig); |
89652331 SW |
405 | if (router_gw_tq) |
406 | batadv_neigh_ifinfo_free_ref(router_gw_tq); | |
407 | if (router_orig_tq) | |
408 | batadv_neigh_ifinfo_free_ref(router_orig_tq); | |
c6c8fea2 SE |
409 | } |
410 | ||
414254e3 ML |
411 | /** |
412 | * batadv_gw_node_add - add gateway node to list of available gateways | |
413 | * @bat_priv: the bat priv with all the soft interface information | |
414 | * @orig_node: originator announcing gateway capabilities | |
415 | * @gateway: announced bandwidth information | |
416 | */ | |
56303d34 SE |
417 | static void batadv_gw_node_add(struct batadv_priv *bat_priv, |
418 | struct batadv_orig_node *orig_node, | |
414254e3 | 419 | struct batadv_tvlv_gateway_data *gateway) |
c6c8fea2 | 420 | { |
56303d34 | 421 | struct batadv_gw_node *gw_node; |
414254e3 ML |
422 | |
423 | if (gateway->bandwidth_down == 0) | |
424 | return; | |
c6c8fea2 | 425 | |
377fe0f9 AQ |
426 | if (!atomic_inc_not_zero(&orig_node->refcount)) |
427 | return; | |
428 | ||
704509b8 | 429 | gw_node = kzalloc(sizeof(*gw_node), GFP_ATOMIC); |
377fe0f9 AQ |
430 | if (!gw_node) { |
431 | batadv_orig_node_free_ref(orig_node); | |
c6c8fea2 | 432 | return; |
377fe0f9 | 433 | } |
c6c8fea2 | 434 | |
c6c8fea2 SE |
435 | INIT_HLIST_NODE(&gw_node->list); |
436 | gw_node->orig_node = orig_node; | |
27a4d5ef SW |
437 | gw_node->bandwidth_down = ntohl(gateway->bandwidth_down); |
438 | gw_node->bandwidth_up = ntohl(gateway->bandwidth_up); | |
25b6d3c1 | 439 | atomic_set(&gw_node->refcount, 1); |
c6c8fea2 | 440 | |
807736f6 SE |
441 | spin_lock_bh(&bat_priv->gw.list_lock); |
442 | hlist_add_head_rcu(&gw_node->list, &bat_priv->gw.list); | |
443 | spin_unlock_bh(&bat_priv->gw.list_lock); | |
c6c8fea2 | 444 | |
39c75a51 | 445 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
414254e3 ML |
446 | "Found new gateway %pM -> gw bandwidth: %u.%u/%u.%u MBit\n", |
447 | orig_node->orig, | |
448 | ntohl(gateway->bandwidth_down) / 10, | |
449 | ntohl(gateway->bandwidth_down) % 10, | |
450 | ntohl(gateway->bandwidth_up) / 10, | |
451 | ntohl(gateway->bandwidth_up) % 10); | |
c6c8fea2 SE |
452 | } |
453 | ||
414254e3 ML |
454 | /** |
455 | * batadv_gw_node_get - retrieve gateway node from list of available gateways | |
456 | * @bat_priv: the bat priv with all the soft interface information | |
457 | * @orig_node: originator announcing gateway capabilities | |
458 | * | |
459 | * Returns gateway node if found or NULL otherwise. | |
460 | */ | |
461 | static struct batadv_gw_node * | |
462 | batadv_gw_node_get(struct batadv_priv *bat_priv, | |
463 | struct batadv_orig_node *orig_node) | |
c6c8fea2 | 464 | { |
414254e3 | 465 | struct batadv_gw_node *gw_node_tmp, *gw_node = NULL; |
c6c8fea2 SE |
466 | |
467 | rcu_read_lock(); | |
414254e3 ML |
468 | hlist_for_each_entry_rcu(gw_node_tmp, &bat_priv->gw.list, list) { |
469 | if (gw_node_tmp->orig_node != orig_node) | |
c6c8fea2 SE |
470 | continue; |
471 | ||
414254e3 ML |
472 | if (!atomic_inc_not_zero(&gw_node_tmp->refcount)) |
473 | continue; | |
c6c8fea2 | 474 | |
414254e3 ML |
475 | gw_node = gw_node_tmp; |
476 | break; | |
477 | } | |
478 | rcu_read_unlock(); | |
c6c8fea2 | 479 | |
414254e3 ML |
480 | return gw_node; |
481 | } | |
c6c8fea2 | 482 | |
414254e3 ML |
483 | /** |
484 | * batadv_gw_node_update - update list of available gateways with changed | |
485 | * bandwidth information | |
486 | * @bat_priv: the bat priv with all the soft interface information | |
487 | * @orig_node: originator announcing gateway capabilities | |
488 | * @gateway: announced bandwidth information | |
489 | */ | |
490 | void batadv_gw_node_update(struct batadv_priv *bat_priv, | |
491 | struct batadv_orig_node *orig_node, | |
492 | struct batadv_tvlv_gateway_data *gateway) | |
493 | { | |
494 | struct batadv_gw_node *gw_node, *curr_gw = NULL; | |
495 | ||
496 | gw_node = batadv_gw_node_get(bat_priv, orig_node); | |
497 | if (!gw_node) { | |
498 | batadv_gw_node_add(bat_priv, orig_node, gateway); | |
499 | goto out; | |
c6c8fea2 | 500 | } |
c6c8fea2 | 501 | |
414254e3 ML |
502 | if ((gw_node->bandwidth_down == ntohl(gateway->bandwidth_down)) && |
503 | (gw_node->bandwidth_up == ntohl(gateway->bandwidth_up))) | |
504 | goto out; | |
c6c8fea2 | 505 | |
414254e3 ML |
506 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
507 | "Gateway bandwidth of originator %pM changed from %u.%u/%u.%u MBit to %u.%u/%u.%u MBit\n", | |
508 | orig_node->orig, | |
509 | gw_node->bandwidth_down / 10, | |
510 | gw_node->bandwidth_down % 10, | |
511 | gw_node->bandwidth_up / 10, | |
512 | gw_node->bandwidth_up % 10, | |
513 | ntohl(gateway->bandwidth_down) / 10, | |
514 | ntohl(gateway->bandwidth_down) % 10, | |
515 | ntohl(gateway->bandwidth_up) / 10, | |
516 | ntohl(gateway->bandwidth_up) % 10); | |
517 | ||
518 | gw_node->bandwidth_down = ntohl(gateway->bandwidth_down); | |
519 | gw_node->bandwidth_up = ntohl(gateway->bandwidth_up); | |
520 | ||
414254e3 | 521 | if (ntohl(gateway->bandwidth_down) == 0) { |
414254e3 ML |
522 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
523 | "Gateway %pM removed from gateway list\n", | |
524 | orig_node->orig); | |
c4aac1ab | 525 | |
414254e3 ML |
526 | /* Note: We don't need a NULL check here, since curr_gw never |
527 | * gets dereferenced. | |
528 | */ | |
bd3524c1 SW |
529 | spin_lock_bh(&bat_priv->gw.list_lock); |
530 | hlist_del_init_rcu(&gw_node->list); | |
531 | spin_unlock_bh(&bat_priv->gw.list_lock); | |
532 | ||
533 | batadv_gw_node_free_ref(gw_node); | |
534 | ||
414254e3 ML |
535 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
536 | if (gw_node == curr_gw) | |
4e820e72 | 537 | batadv_gw_reselect(bat_priv); |
bd3524c1 SW |
538 | |
539 | if (curr_gw) | |
540 | batadv_gw_node_free_ref(curr_gw); | |
414254e3 | 541 | } |
71e4aa9c | 542 | |
414254e3 | 543 | out: |
414254e3 ML |
544 | if (gw_node) |
545 | batadv_gw_node_free_ref(gw_node); | |
c6c8fea2 SE |
546 | } |
547 | ||
56303d34 SE |
548 | void batadv_gw_node_delete(struct batadv_priv *bat_priv, |
549 | struct batadv_orig_node *orig_node) | |
c6c8fea2 | 550 | { |
414254e3 ML |
551 | struct batadv_tvlv_gateway_data gateway; |
552 | ||
553 | gateway.bandwidth_down = 0; | |
554 | gateway.bandwidth_up = 0; | |
555 | ||
556 | batadv_gw_node_update(bat_priv, orig_node, &gateway); | |
c6c8fea2 SE |
557 | } |
558 | ||
bd3524c1 | 559 | void batadv_gw_node_free(struct batadv_priv *bat_priv) |
c6c8fea2 | 560 | { |
bd3524c1 | 561 | struct batadv_gw_node *gw_node; |
b67bfe0d | 562 | struct hlist_node *node_tmp; |
c6c8fea2 | 563 | |
807736f6 | 564 | spin_lock_bh(&bat_priv->gw.list_lock); |
b67bfe0d | 565 | hlist_for_each_entry_safe(gw_node, node_tmp, |
807736f6 | 566 | &bat_priv->gw.list, list) { |
bd3524c1 | 567 | hlist_del_init_rcu(&gw_node->list); |
1409a834 | 568 | batadv_gw_node_free_ref(gw_node); |
c6c8fea2 | 569 | } |
807736f6 | 570 | spin_unlock_bh(&bat_priv->gw.list_lock); |
c6c8fea2 SE |
571 | } |
572 | ||
9cfc7bd6 | 573 | /* fails if orig_node has no router */ |
56303d34 SE |
574 | static int batadv_write_buffer_text(struct batadv_priv *bat_priv, |
575 | struct seq_file *seq, | |
576 | const struct batadv_gw_node *gw_node) | |
c6c8fea2 | 577 | { |
56303d34 SE |
578 | struct batadv_gw_node *curr_gw; |
579 | struct batadv_neigh_node *router; | |
89652331 | 580 | struct batadv_neigh_ifinfo *router_ifinfo = NULL; |
414254e3 | 581 | int ret = -1; |
c6c8fea2 | 582 | |
7351a482 | 583 | router = batadv_orig_router_get(gw_node->orig_node, BATADV_IF_DEFAULT); |
e1a5382f LL |
584 | if (!router) |
585 | goto out; | |
5d02b3cd | 586 | |
89652331 SW |
587 | router_ifinfo = batadv_neigh_ifinfo_get(router, BATADV_IF_DEFAULT); |
588 | if (!router_ifinfo) | |
589 | goto out; | |
590 | ||
1409a834 | 591 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
5d02b3cd | 592 | |
6d91147d JP |
593 | seq_printf(seq, "%s %pM (%3i) %pM [%10s]: %u.%u/%u.%u MBit\n", |
594 | (curr_gw == gw_node ? "=>" : " "), | |
595 | gw_node->orig_node->orig, | |
596 | router_ifinfo->bat_iv.tq_avg, router->addr, | |
597 | router->if_incoming->net_dev->name, | |
598 | gw_node->bandwidth_down / 10, | |
599 | gw_node->bandwidth_down % 10, | |
600 | gw_node->bandwidth_up / 10, | |
601 | gw_node->bandwidth_up % 10); | |
92b83917 | 602 | ret = seq_has_overflowed(seq) ? -1 : 0; |
5d02b3cd | 603 | |
c4aac1ab | 604 | if (curr_gw) |
1409a834 | 605 | batadv_gw_node_free_ref(curr_gw); |
e1a5382f | 606 | out: |
89652331 SW |
607 | if (router_ifinfo) |
608 | batadv_neigh_ifinfo_free_ref(router_ifinfo); | |
609 | if (router) | |
610 | batadv_neigh_node_free_ref(router); | |
5d02b3cd | 611 | return ret; |
c6c8fea2 SE |
612 | } |
613 | ||
7cf06bc6 | 614 | int batadv_gw_client_seq_print_text(struct seq_file *seq, void *offset) |
c6c8fea2 SE |
615 | { |
616 | struct net_device *net_dev = (struct net_device *)seq->private; | |
56303d34 SE |
617 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
618 | struct batadv_hard_iface *primary_if; | |
619 | struct batadv_gw_node *gw_node; | |
30da63a6 | 620 | int gw_count = 0; |
c6c8fea2 | 621 | |
30da63a6 ML |
622 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
623 | if (!primary_if) | |
32ae9b22 | 624 | goto out; |
c6c8fea2 | 625 | |
86ceb360 | 626 | seq_printf(seq, |
414254e3 | 627 | " %-12s (%s/%i) %17s [%10s]: advertised uplink bandwidth ... [B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s)]\n", |
42d0b044 SE |
628 | "Gateway", "#", BATADV_TQ_MAX_VALUE, "Nexthop", "outgoingIF", |
629 | BATADV_SOURCE_VERSION, primary_if->net_dev->name, | |
32ae9b22 | 630 | primary_if->net_dev->dev_addr, net_dev->name); |
c6c8fea2 SE |
631 | |
632 | rcu_read_lock(); | |
b67bfe0d | 633 | hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.list, list) { |
e1a5382f | 634 | /* fails if orig_node has no router */ |
1409a834 | 635 | if (batadv_write_buffer_text(bat_priv, seq, gw_node) < 0) |
c6c8fea2 SE |
636 | continue; |
637 | ||
c6c8fea2 SE |
638 | gw_count++; |
639 | } | |
640 | rcu_read_unlock(); | |
641 | ||
642 | if (gw_count == 0) | |
0c814653 | 643 | seq_puts(seq, "No gateways in range ...\n"); |
c6c8fea2 | 644 | |
32ae9b22 ML |
645 | out: |
646 | if (primary_if) | |
e5d89254 | 647 | batadv_hardif_free_ref(primary_if); |
30da63a6 | 648 | return 0; |
c6c8fea2 SE |
649 | } |
650 | ||
6c413b1c AQ |
651 | /** |
652 | * batadv_gw_dhcp_recipient_get - check if a packet is a DHCP message | |
653 | * @skb: the packet to check | |
654 | * @header_len: a pointer to the batman-adv header size | |
655 | * @chaddr: buffer where the client address will be stored. Valid | |
656 | * only if the function returns BATADV_DHCP_TO_CLIENT | |
657 | * | |
658 | * Returns: | |
659 | * - BATADV_DHCP_NO if the packet is not a dhcp message or if there was an error | |
660 | * while parsing it | |
661 | * - BATADV_DHCP_TO_SERVER if this is a message going to the DHCP server | |
662 | * - BATADV_DHCP_TO_CLIENT if this is a message going to a DHCP client | |
663 | * | |
664 | * This function may re-allocate the data buffer of the skb passed as argument. | |
665 | */ | |
666 | enum batadv_dhcp_recipient | |
667 | batadv_gw_dhcp_recipient_get(struct sk_buff *skb, unsigned int *header_len, | |
6b5e971a | 668 | u8 *chaddr) |
c6c8fea2 | 669 | { |
6c413b1c | 670 | enum batadv_dhcp_recipient ret = BATADV_DHCP_NO; |
c6c8fea2 SE |
671 | struct ethhdr *ethhdr; |
672 | struct iphdr *iphdr; | |
673 | struct ipv6hdr *ipv6hdr; | |
674 | struct udphdr *udphdr; | |
f7f8ed56 | 675 | struct vlan_ethhdr *vhdr; |
6c413b1c | 676 | int chaddr_offset; |
f7f8ed56 | 677 | __be16 proto; |
6b5e971a | 678 | u8 *p; |
c6c8fea2 SE |
679 | |
680 | /* check for ethernet header */ | |
be7af5cf | 681 | if (!pskb_may_pull(skb, *header_len + ETH_HLEN)) |
6c413b1c AQ |
682 | return BATADV_DHCP_NO; |
683 | ||
927c2ed7 | 684 | ethhdr = eth_hdr(skb); |
f7f8ed56 | 685 | proto = ethhdr->h_proto; |
be7af5cf | 686 | *header_len += ETH_HLEN; |
c6c8fea2 SE |
687 | |
688 | /* check for initial vlan header */ | |
f7f8ed56 | 689 | if (proto == htons(ETH_P_8021Q)) { |
be7af5cf | 690 | if (!pskb_may_pull(skb, *header_len + VLAN_HLEN)) |
6c413b1c | 691 | return BATADV_DHCP_NO; |
f7f8ed56 | 692 | |
927c2ed7 | 693 | vhdr = vlan_eth_hdr(skb); |
f7f8ed56 | 694 | proto = vhdr->h_vlan_encapsulated_proto; |
be7af5cf | 695 | *header_len += VLAN_HLEN; |
c6c8fea2 SE |
696 | } |
697 | ||
698 | /* check for ip header */ | |
f7f8ed56 AQ |
699 | switch (proto) { |
700 | case htons(ETH_P_IP): | |
be7af5cf | 701 | if (!pskb_may_pull(skb, *header_len + sizeof(*iphdr))) |
6c413b1c AQ |
702 | return BATADV_DHCP_NO; |
703 | ||
be7af5cf ML |
704 | iphdr = (struct iphdr *)(skb->data + *header_len); |
705 | *header_len += iphdr->ihl * 4; | |
c6c8fea2 SE |
706 | |
707 | /* check for udp header */ | |
708 | if (iphdr->protocol != IPPROTO_UDP) | |
6c413b1c | 709 | return BATADV_DHCP_NO; |
c6c8fea2 SE |
710 | |
711 | break; | |
f7f8ed56 | 712 | case htons(ETH_P_IPV6): |
be7af5cf | 713 | if (!pskb_may_pull(skb, *header_len + sizeof(*ipv6hdr))) |
6c413b1c AQ |
714 | return BATADV_DHCP_NO; |
715 | ||
be7af5cf ML |
716 | ipv6hdr = (struct ipv6hdr *)(skb->data + *header_len); |
717 | *header_len += sizeof(*ipv6hdr); | |
c6c8fea2 SE |
718 | |
719 | /* check for udp header */ | |
720 | if (ipv6hdr->nexthdr != IPPROTO_UDP) | |
6c413b1c | 721 | return BATADV_DHCP_NO; |
c6c8fea2 SE |
722 | |
723 | break; | |
724 | default: | |
6c413b1c | 725 | return BATADV_DHCP_NO; |
c6c8fea2 SE |
726 | } |
727 | ||
be7af5cf | 728 | if (!pskb_may_pull(skb, *header_len + sizeof(*udphdr))) |
6c413b1c | 729 | return BATADV_DHCP_NO; |
9d2c9488 | 730 | |
be7af5cf ML |
731 | udphdr = (struct udphdr *)(skb->data + *header_len); |
732 | *header_len += sizeof(*udphdr); | |
c6c8fea2 SE |
733 | |
734 | /* check for bootp port */ | |
6c413b1c AQ |
735 | switch (proto) { |
736 | case htons(ETH_P_IP): | |
737 | if (udphdr->dest == htons(67)) | |
738 | ret = BATADV_DHCP_TO_SERVER; | |
739 | else if (udphdr->source == htons(67)) | |
740 | ret = BATADV_DHCP_TO_CLIENT; | |
741 | break; | |
742 | case htons(ETH_P_IPV6): | |
743 | if (udphdr->dest == htons(547)) | |
744 | ret = BATADV_DHCP_TO_SERVER; | |
745 | else if (udphdr->source == htons(547)) | |
746 | ret = BATADV_DHCP_TO_CLIENT; | |
747 | break; | |
748 | } | |
c6c8fea2 | 749 | |
6c413b1c AQ |
750 | chaddr_offset = *header_len + BATADV_DHCP_CHADDR_OFFSET; |
751 | /* store the client address if the message is going to a client */ | |
752 | if (ret == BATADV_DHCP_TO_CLIENT && | |
753 | pskb_may_pull(skb, chaddr_offset + ETH_ALEN)) { | |
754 | /* check if the DHCP packet carries an Ethernet DHCP */ | |
755 | p = skb->data + *header_len + BATADV_DHCP_HTYPE_OFFSET; | |
756 | if (*p != BATADV_DHCP_HTYPE_ETHERNET) | |
757 | return BATADV_DHCP_NO; | |
758 | ||
759 | /* check if the DHCP packet carries a valid Ethernet address */ | |
760 | p = skb->data + *header_len + BATADV_DHCP_HLEN_OFFSET; | |
761 | if (*p != ETH_ALEN) | |
762 | return BATADV_DHCP_NO; | |
763 | ||
8fdd0153 | 764 | ether_addr_copy(chaddr, skb->data + chaddr_offset); |
6c413b1c | 765 | } |
c6c8fea2 | 766 | |
6c413b1c | 767 | return ret; |
be7af5cf | 768 | } |
aa143d28 | 769 | |
bbb877ed AQ |
770 | /** |
771 | * batadv_gw_out_of_range - check if the dhcp request destination is the best gw | |
772 | * @bat_priv: the bat priv with all the soft interface information | |
773 | * @skb: the outgoing packet | |
774 | * | |
775 | * Check if the skb is a DHCP request and if it is sent to the current best GW | |
776 | * server. Due to topology changes it may be the case that the GW server | |
777 | * previously selected is not the best one anymore. | |
778 | * | |
779 | * Returns true if the packet destination is unicast and it is not the best gw, | |
780 | * false otherwise. | |
781 | * | |
782 | * This call might reallocate skb data. | |
6c413b1c | 783 | * Must be invoked only when the DHCP packet is going TO a DHCP SERVER. |
bbb877ed | 784 | */ |
56303d34 | 785 | bool batadv_gw_out_of_range(struct batadv_priv *bat_priv, |
9d2c9488 | 786 | struct sk_buff *skb) |
be7af5cf | 787 | { |
4f248cff SE |
788 | struct batadv_neigh_node *neigh_curr = NULL; |
789 | struct batadv_neigh_node *neigh_old = NULL; | |
56303d34 | 790 | struct batadv_orig_node *orig_dst_node = NULL; |
4f248cff SE |
791 | struct batadv_gw_node *gw_node = NULL; |
792 | struct batadv_gw_node *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; | |
6b5e971a | 796 | u8 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 | 806 | gw_node = batadv_gw_node_get(bat_priv, orig_dst_node); |
0d164491 | 807 | if (!gw_node) |
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 | } |