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c6c8fea2 | 1 | /* |
64afe353 | 2 | * Copyright (C) 2009-2011 B.A.T.M.A.N. contributors: |
c6c8fea2 SE |
3 | * |
4 | * Marek Lindner | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of version 2 of the GNU General Public | |
8 | * License as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
18 | * 02110-1301, USA | |
19 | * | |
20 | */ | |
21 | ||
22 | #include "main.h" | |
23 | #include "gateway_client.h" | |
24 | #include "gateway_common.h" | |
25 | #include "hard-interface.h" | |
26 | #include <linux/ip.h> | |
27 | #include <linux/ipv6.h> | |
28 | #include <linux/udp.h> | |
29 | #include <linux/if_vlan.h> | |
30 | ||
25b6d3c1 | 31 | static void gw_node_free_rcu(struct rcu_head *rcu) |
c6c8fea2 SE |
32 | { |
33 | struct gw_node *gw_node; | |
34 | ||
25b6d3c1 | 35 | gw_node = container_of(rcu, struct gw_node, rcu); |
c6c8fea2 SE |
36 | kfree(gw_node); |
37 | } | |
38 | ||
25b6d3c1 | 39 | static void gw_node_free_ref(struct gw_node *gw_node) |
c6c8fea2 | 40 | { |
25b6d3c1 ML |
41 | if (atomic_dec_and_test(&gw_node->refcount)) |
42 | call_rcu(&gw_node->rcu, gw_node_free_rcu); | |
c6c8fea2 SE |
43 | } |
44 | ||
45 | void *gw_get_selected(struct bat_priv *bat_priv) | |
46 | { | |
5d02b3cd LL |
47 | struct gw_node *curr_gateway_tmp; |
48 | struct orig_node *orig_node = NULL; | |
c6c8fea2 | 49 | |
5d02b3cd LL |
50 | rcu_read_lock(); |
51 | curr_gateway_tmp = rcu_dereference(bat_priv->curr_gw); | |
c6c8fea2 | 52 | if (!curr_gateway_tmp) |
5d02b3cd LL |
53 | goto out; |
54 | ||
55 | orig_node = curr_gateway_tmp->orig_node; | |
c6c8fea2 | 56 | |
5d02b3cd LL |
57 | out: |
58 | rcu_read_unlock(); | |
59 | return orig_node; | |
c6c8fea2 SE |
60 | } |
61 | ||
62 | void gw_deselect(struct bat_priv *bat_priv) | |
63 | { | |
5d02b3cd | 64 | struct gw_node *gw_node; |
c6c8fea2 | 65 | |
5d02b3cd LL |
66 | spin_lock_bh(&bat_priv->gw_list_lock); |
67 | gw_node = rcu_dereference(bat_priv->curr_gw); | |
68 | rcu_assign_pointer(bat_priv->curr_gw, NULL); | |
69 | spin_unlock_bh(&bat_priv->gw_list_lock); | |
c6c8fea2 SE |
70 | |
71 | if (gw_node) | |
25b6d3c1 | 72 | gw_node_free_ref(gw_node); |
c6c8fea2 SE |
73 | } |
74 | ||
25b6d3c1 | 75 | static void gw_select(struct bat_priv *bat_priv, struct gw_node *new_gw_node) |
c6c8fea2 | 76 | { |
5d02b3cd | 77 | struct gw_node *curr_gw_node; |
c6c8fea2 | 78 | |
25b6d3c1 ML |
79 | if (new_gw_node && !atomic_inc_not_zero(&new_gw_node->refcount)) |
80 | new_gw_node = NULL; | |
c6c8fea2 | 81 | |
5d02b3cd LL |
82 | spin_lock_bh(&bat_priv->gw_list_lock); |
83 | curr_gw_node = rcu_dereference(bat_priv->curr_gw); | |
84 | rcu_assign_pointer(bat_priv->curr_gw, new_gw_node); | |
85 | spin_unlock_bh(&bat_priv->gw_list_lock); | |
25b6d3c1 ML |
86 | |
87 | if (curr_gw_node) | |
88 | gw_node_free_ref(curr_gw_node); | |
c6c8fea2 SE |
89 | } |
90 | ||
91 | void gw_election(struct bat_priv *bat_priv) | |
92 | { | |
93 | struct hlist_node *node; | |
5d02b3cd | 94 | struct gw_node *gw_node, *curr_gw, *curr_gw_tmp = NULL; |
c6c8fea2 SE |
95 | uint8_t max_tq = 0; |
96 | uint32_t max_gw_factor = 0, tmp_gw_factor = 0; | |
97 | int down, up; | |
98 | ||
99 | /** | |
100 | * The batman daemon checks here if we already passed a full originator | |
101 | * cycle in order to make sure we don't choose the first gateway we | |
102 | * hear about. This check is based on the daemon's uptime which we | |
103 | * don't have. | |
104 | **/ | |
105 | if (atomic_read(&bat_priv->gw_mode) != GW_MODE_CLIENT) | |
106 | return; | |
107 | ||
5d02b3cd LL |
108 | rcu_read_lock(); |
109 | curr_gw = rcu_dereference(bat_priv->curr_gw); | |
110 | if (curr_gw) { | |
111 | rcu_read_unlock(); | |
c6c8fea2 | 112 | return; |
5d02b3cd | 113 | } |
c6c8fea2 | 114 | |
c6c8fea2 | 115 | if (hlist_empty(&bat_priv->gw_list)) { |
c6c8fea2 | 116 | |
5d02b3cd LL |
117 | if (curr_gw) { |
118 | rcu_read_unlock(); | |
c6c8fea2 SE |
119 | bat_dbg(DBG_BATMAN, bat_priv, |
120 | "Removing selected gateway - " | |
121 | "no gateway in range\n"); | |
122 | gw_deselect(bat_priv); | |
5d02b3cd LL |
123 | } else |
124 | rcu_read_unlock(); | |
c6c8fea2 SE |
125 | |
126 | return; | |
127 | } | |
128 | ||
129 | hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) { | |
130 | if (!gw_node->orig_node->router) | |
131 | continue; | |
132 | ||
133 | if (gw_node->deleted) | |
134 | continue; | |
135 | ||
136 | switch (atomic_read(&bat_priv->gw_sel_class)) { | |
137 | case 1: /* fast connection */ | |
138 | gw_bandwidth_to_kbit(gw_node->orig_node->gw_flags, | |
139 | &down, &up); | |
140 | ||
141 | tmp_gw_factor = (gw_node->orig_node->router->tq_avg * | |
142 | gw_node->orig_node->router->tq_avg * | |
143 | down * 100 * 100) / | |
144 | (TQ_LOCAL_WINDOW_SIZE * | |
145 | TQ_LOCAL_WINDOW_SIZE * 64); | |
146 | ||
147 | if ((tmp_gw_factor > max_gw_factor) || | |
148 | ((tmp_gw_factor == max_gw_factor) && | |
149 | (gw_node->orig_node->router->tq_avg > max_tq))) | |
150 | curr_gw_tmp = gw_node; | |
151 | break; | |
152 | ||
153 | default: /** | |
154 | * 2: stable connection (use best statistic) | |
155 | * 3: fast-switch (use best statistic but change as | |
156 | * soon as a better gateway appears) | |
157 | * XX: late-switch (use best statistic but change as | |
158 | * soon as a better gateway appears which has | |
159 | * $routing_class more tq points) | |
160 | **/ | |
161 | if (gw_node->orig_node->router->tq_avg > max_tq) | |
162 | curr_gw_tmp = gw_node; | |
163 | break; | |
164 | } | |
165 | ||
166 | if (gw_node->orig_node->router->tq_avg > max_tq) | |
167 | max_tq = gw_node->orig_node->router->tq_avg; | |
168 | ||
169 | if (tmp_gw_factor > max_gw_factor) | |
170 | max_gw_factor = tmp_gw_factor; | |
171 | } | |
172 | ||
5d02b3cd LL |
173 | if (curr_gw != curr_gw_tmp) { |
174 | if ((curr_gw) && (!curr_gw_tmp)) | |
c6c8fea2 SE |
175 | bat_dbg(DBG_BATMAN, bat_priv, |
176 | "Removing selected gateway - " | |
177 | "no gateway in range\n"); | |
5d02b3cd | 178 | else if ((!curr_gw) && (curr_gw_tmp)) |
c6c8fea2 SE |
179 | bat_dbg(DBG_BATMAN, bat_priv, |
180 | "Adding route to gateway %pM " | |
181 | "(gw_flags: %i, tq: %i)\n", | |
182 | curr_gw_tmp->orig_node->orig, | |
183 | curr_gw_tmp->orig_node->gw_flags, | |
184 | curr_gw_tmp->orig_node->router->tq_avg); | |
185 | else | |
186 | bat_dbg(DBG_BATMAN, bat_priv, | |
187 | "Changing route to gateway %pM " | |
188 | "(gw_flags: %i, tq: %i)\n", | |
189 | curr_gw_tmp->orig_node->orig, | |
190 | curr_gw_tmp->orig_node->gw_flags, | |
191 | curr_gw_tmp->orig_node->router->tq_avg); | |
192 | ||
25b6d3c1 | 193 | gw_select(bat_priv, curr_gw_tmp); |
c6c8fea2 SE |
194 | } |
195 | ||
196 | rcu_read_unlock(); | |
c6c8fea2 SE |
197 | } |
198 | ||
199 | void gw_check_election(struct bat_priv *bat_priv, struct orig_node *orig_node) | |
200 | { | |
5d02b3cd | 201 | struct gw_node *curr_gateway_tmp; |
c6c8fea2 SE |
202 | uint8_t gw_tq_avg, orig_tq_avg; |
203 | ||
5d02b3cd LL |
204 | rcu_read_lock(); |
205 | curr_gateway_tmp = rcu_dereference(bat_priv->curr_gw); | |
c6c8fea2 | 206 | if (!curr_gateway_tmp) |
5d02b3cd | 207 | goto out_rcu; |
c6c8fea2 SE |
208 | |
209 | if (!curr_gateway_tmp->orig_node) | |
5d02b3cd | 210 | goto deselect_rcu; |
c6c8fea2 SE |
211 | |
212 | if (!curr_gateway_tmp->orig_node->router) | |
5d02b3cd | 213 | goto deselect_rcu; |
c6c8fea2 SE |
214 | |
215 | /* this node already is the gateway */ | |
216 | if (curr_gateway_tmp->orig_node == orig_node) | |
5d02b3cd | 217 | goto out_rcu; |
c6c8fea2 SE |
218 | |
219 | if (!orig_node->router) | |
5d02b3cd | 220 | goto out_rcu; |
c6c8fea2 SE |
221 | |
222 | gw_tq_avg = curr_gateway_tmp->orig_node->router->tq_avg; | |
5d02b3cd LL |
223 | rcu_read_unlock(); |
224 | ||
c6c8fea2 SE |
225 | orig_tq_avg = orig_node->router->tq_avg; |
226 | ||
227 | /* the TQ value has to be better */ | |
228 | if (orig_tq_avg < gw_tq_avg) | |
5d02b3cd | 229 | goto out; |
c6c8fea2 SE |
230 | |
231 | /** | |
232 | * if the routing class is greater than 3 the value tells us how much | |
233 | * greater the TQ value of the new gateway must be | |
234 | **/ | |
235 | if ((atomic_read(&bat_priv->gw_sel_class) > 3) && | |
236 | (orig_tq_avg - gw_tq_avg < atomic_read(&bat_priv->gw_sel_class))) | |
5d02b3cd | 237 | goto out; |
c6c8fea2 SE |
238 | |
239 | bat_dbg(DBG_BATMAN, bat_priv, | |
240 | "Restarting gateway selection: better gateway found (tq curr: " | |
241 | "%i, tq new: %i)\n", | |
242 | gw_tq_avg, orig_tq_avg); | |
5d02b3cd | 243 | goto deselect; |
c6c8fea2 | 244 | |
5d02b3cd LL |
245 | out_rcu: |
246 | rcu_read_unlock(); | |
247 | goto out; | |
248 | deselect_rcu: | |
249 | rcu_read_unlock(); | |
c6c8fea2 SE |
250 | deselect: |
251 | gw_deselect(bat_priv); | |
5d02b3cd LL |
252 | out: |
253 | return; | |
c6c8fea2 SE |
254 | } |
255 | ||
256 | static void gw_node_add(struct bat_priv *bat_priv, | |
257 | struct orig_node *orig_node, uint8_t new_gwflags) | |
258 | { | |
259 | struct gw_node *gw_node; | |
260 | int down, up; | |
261 | ||
262 | gw_node = kmalloc(sizeof(struct gw_node), GFP_ATOMIC); | |
263 | if (!gw_node) | |
264 | return; | |
265 | ||
266 | memset(gw_node, 0, sizeof(struct gw_node)); | |
267 | INIT_HLIST_NODE(&gw_node->list); | |
268 | gw_node->orig_node = orig_node; | |
25b6d3c1 | 269 | atomic_set(&gw_node->refcount, 1); |
c6c8fea2 SE |
270 | |
271 | spin_lock_bh(&bat_priv->gw_list_lock); | |
272 | hlist_add_head_rcu(&gw_node->list, &bat_priv->gw_list); | |
273 | spin_unlock_bh(&bat_priv->gw_list_lock); | |
274 | ||
275 | gw_bandwidth_to_kbit(new_gwflags, &down, &up); | |
276 | bat_dbg(DBG_BATMAN, bat_priv, | |
277 | "Found new gateway %pM -> gw_class: %i - %i%s/%i%s\n", | |
278 | orig_node->orig, new_gwflags, | |
279 | (down > 2048 ? down / 1024 : down), | |
280 | (down > 2048 ? "MBit" : "KBit"), | |
281 | (up > 2048 ? up / 1024 : up), | |
282 | (up > 2048 ? "MBit" : "KBit")); | |
283 | } | |
284 | ||
285 | void gw_node_update(struct bat_priv *bat_priv, | |
286 | struct orig_node *orig_node, uint8_t new_gwflags) | |
287 | { | |
288 | struct hlist_node *node; | |
289 | struct gw_node *gw_node; | |
290 | ||
291 | rcu_read_lock(); | |
292 | hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) { | |
293 | if (gw_node->orig_node != orig_node) | |
294 | continue; | |
295 | ||
296 | bat_dbg(DBG_BATMAN, bat_priv, | |
297 | "Gateway class of originator %pM changed from " | |
298 | "%i to %i\n", | |
299 | orig_node->orig, gw_node->orig_node->gw_flags, | |
300 | new_gwflags); | |
301 | ||
302 | gw_node->deleted = 0; | |
303 | ||
304 | if (new_gwflags == 0) { | |
305 | gw_node->deleted = jiffies; | |
306 | bat_dbg(DBG_BATMAN, bat_priv, | |
307 | "Gateway %pM removed from gateway list\n", | |
308 | orig_node->orig); | |
309 | ||
5d02b3cd | 310 | if (gw_node == rcu_dereference(bat_priv->curr_gw)) { |
c6c8fea2 SE |
311 | rcu_read_unlock(); |
312 | gw_deselect(bat_priv); | |
313 | return; | |
314 | } | |
315 | } | |
316 | ||
317 | rcu_read_unlock(); | |
318 | return; | |
319 | } | |
320 | rcu_read_unlock(); | |
321 | ||
322 | if (new_gwflags == 0) | |
323 | return; | |
324 | ||
325 | gw_node_add(bat_priv, orig_node, new_gwflags); | |
326 | } | |
327 | ||
328 | void gw_node_delete(struct bat_priv *bat_priv, struct orig_node *orig_node) | |
329 | { | |
330 | return gw_node_update(bat_priv, orig_node, 0); | |
331 | } | |
332 | ||
333 | void gw_node_purge(struct bat_priv *bat_priv) | |
334 | { | |
335 | struct gw_node *gw_node; | |
336 | struct hlist_node *node, *node_tmp; | |
337 | unsigned long timeout = 2 * PURGE_TIMEOUT * HZ; | |
338 | ||
339 | spin_lock_bh(&bat_priv->gw_list_lock); | |
340 | ||
341 | hlist_for_each_entry_safe(gw_node, node, node_tmp, | |
342 | &bat_priv->gw_list, list) { | |
343 | if (((!gw_node->deleted) || | |
344 | (time_before(jiffies, gw_node->deleted + timeout))) && | |
345 | atomic_read(&bat_priv->mesh_state) == MESH_ACTIVE) | |
346 | continue; | |
347 | ||
5d02b3cd | 348 | if (rcu_dereference(bat_priv->curr_gw) == gw_node) |
c6c8fea2 SE |
349 | gw_deselect(bat_priv); |
350 | ||
351 | hlist_del_rcu(&gw_node->list); | |
25b6d3c1 | 352 | gw_node_free_ref(gw_node); |
c6c8fea2 SE |
353 | } |
354 | ||
355 | ||
356 | spin_unlock_bh(&bat_priv->gw_list_lock); | |
357 | } | |
358 | ||
359 | static int _write_buffer_text(struct bat_priv *bat_priv, | |
360 | struct seq_file *seq, struct gw_node *gw_node) | |
361 | { | |
5d02b3cd LL |
362 | struct gw_node *curr_gw; |
363 | int down, up, ret; | |
c6c8fea2 SE |
364 | |
365 | gw_bandwidth_to_kbit(gw_node->orig_node->gw_flags, &down, &up); | |
366 | ||
5d02b3cd LL |
367 | rcu_read_lock(); |
368 | curr_gw = rcu_dereference(bat_priv->curr_gw); | |
369 | ||
370 | ret = seq_printf(seq, "%s %pM (%3i) %pM [%10s]: %3i - %i%s/%i%s\n", | |
371 | (curr_gw == gw_node ? "=>" : " "), | |
c6c8fea2 SE |
372 | gw_node->orig_node->orig, |
373 | gw_node->orig_node->router->tq_avg, | |
374 | gw_node->orig_node->router->addr, | |
375 | gw_node->orig_node->router->if_incoming->net_dev->name, | |
376 | gw_node->orig_node->gw_flags, | |
377 | (down > 2048 ? down / 1024 : down), | |
378 | (down > 2048 ? "MBit" : "KBit"), | |
379 | (up > 2048 ? up / 1024 : up), | |
380 | (up > 2048 ? "MBit" : "KBit")); | |
5d02b3cd LL |
381 | |
382 | rcu_read_unlock(); | |
383 | return ret; | |
c6c8fea2 SE |
384 | } |
385 | ||
386 | int gw_client_seq_print_text(struct seq_file *seq, void *offset) | |
387 | { | |
388 | struct net_device *net_dev = (struct net_device *)seq->private; | |
389 | struct bat_priv *bat_priv = netdev_priv(net_dev); | |
390 | struct gw_node *gw_node; | |
391 | struct hlist_node *node; | |
392 | int gw_count = 0; | |
393 | ||
394 | if (!bat_priv->primary_if) { | |
395 | ||
396 | return seq_printf(seq, "BATMAN mesh %s disabled - please " | |
397 | "specify interfaces to enable it\n", | |
398 | net_dev->name); | |
399 | } | |
400 | ||
401 | if (bat_priv->primary_if->if_status != IF_ACTIVE) { | |
402 | ||
403 | return seq_printf(seq, "BATMAN mesh %s disabled - " | |
404 | "primary interface not active\n", | |
405 | net_dev->name); | |
406 | } | |
407 | ||
408 | seq_printf(seq, " %-12s (%s/%i) %17s [%10s]: gw_class ... " | |
409 | "[B.A.T.M.A.N. adv %s%s, MainIF/MAC: %s/%pM (%s)]\n", | |
410 | "Gateway", "#", TQ_MAX_VALUE, "Nexthop", | |
411 | "outgoingIF", SOURCE_VERSION, REVISION_VERSION_STR, | |
412 | bat_priv->primary_if->net_dev->name, | |
413 | bat_priv->primary_if->net_dev->dev_addr, net_dev->name); | |
414 | ||
415 | rcu_read_lock(); | |
416 | hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) { | |
417 | if (gw_node->deleted) | |
418 | continue; | |
419 | ||
420 | if (!gw_node->orig_node->router) | |
421 | continue; | |
422 | ||
423 | _write_buffer_text(bat_priv, seq, gw_node); | |
424 | gw_count++; | |
425 | } | |
426 | rcu_read_unlock(); | |
427 | ||
428 | if (gw_count == 0) | |
429 | seq_printf(seq, "No gateways in range ...\n"); | |
430 | ||
431 | return 0; | |
432 | } | |
433 | ||
434 | int gw_is_target(struct bat_priv *bat_priv, struct sk_buff *skb) | |
435 | { | |
436 | struct ethhdr *ethhdr; | |
437 | struct iphdr *iphdr; | |
438 | struct ipv6hdr *ipv6hdr; | |
439 | struct udphdr *udphdr; | |
440 | unsigned int header_len = 0; | |
441 | ||
442 | if (atomic_read(&bat_priv->gw_mode) == GW_MODE_OFF) | |
443 | return 0; | |
444 | ||
445 | /* check for ethernet header */ | |
446 | if (!pskb_may_pull(skb, header_len + ETH_HLEN)) | |
447 | return 0; | |
448 | ethhdr = (struct ethhdr *)skb->data; | |
449 | header_len += ETH_HLEN; | |
450 | ||
451 | /* check for initial vlan header */ | |
452 | if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) { | |
453 | if (!pskb_may_pull(skb, header_len + VLAN_HLEN)) | |
454 | return 0; | |
455 | ethhdr = (struct ethhdr *)(skb->data + VLAN_HLEN); | |
456 | header_len += VLAN_HLEN; | |
457 | } | |
458 | ||
459 | /* check for ip header */ | |
460 | switch (ntohs(ethhdr->h_proto)) { | |
461 | case ETH_P_IP: | |
462 | if (!pskb_may_pull(skb, header_len + sizeof(struct iphdr))) | |
463 | return 0; | |
464 | iphdr = (struct iphdr *)(skb->data + header_len); | |
465 | header_len += iphdr->ihl * 4; | |
466 | ||
467 | /* check for udp header */ | |
468 | if (iphdr->protocol != IPPROTO_UDP) | |
469 | return 0; | |
470 | ||
471 | break; | |
472 | case ETH_P_IPV6: | |
473 | if (!pskb_may_pull(skb, header_len + sizeof(struct ipv6hdr))) | |
474 | return 0; | |
475 | ipv6hdr = (struct ipv6hdr *)(skb->data + header_len); | |
476 | header_len += sizeof(struct ipv6hdr); | |
477 | ||
478 | /* check for udp header */ | |
479 | if (ipv6hdr->nexthdr != IPPROTO_UDP) | |
480 | return 0; | |
481 | ||
482 | break; | |
483 | default: | |
484 | return 0; | |
485 | } | |
486 | ||
487 | if (!pskb_may_pull(skb, header_len + sizeof(struct udphdr))) | |
488 | return 0; | |
489 | udphdr = (struct udphdr *)(skb->data + header_len); | |
490 | header_len += sizeof(struct udphdr); | |
491 | ||
492 | /* check for bootp port */ | |
493 | if ((ntohs(ethhdr->h_proto) == ETH_P_IP) && | |
494 | (ntohs(udphdr->dest) != 67)) | |
495 | return 0; | |
496 | ||
497 | if ((ntohs(ethhdr->h_proto) == ETH_P_IPV6) && | |
498 | (ntohs(udphdr->dest) != 547)) | |
499 | return 0; | |
500 | ||
501 | if (atomic_read(&bat_priv->gw_mode) == GW_MODE_SERVER) | |
502 | return -1; | |
503 | ||
5d02b3cd LL |
504 | rcu_read_lock(); |
505 | if (!rcu_dereference(bat_priv->curr_gw)) { | |
506 | rcu_read_unlock(); | |
c6c8fea2 | 507 | return 0; |
5d02b3cd LL |
508 | } |
509 | rcu_read_unlock(); | |
c6c8fea2 SE |
510 | |
511 | return 1; | |
512 | } |