Commit | Line | Data |
---|---|---|
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; | |
7b36e8ee ML |
56 | if (!orig_node) |
57 | goto out; | |
c6c8fea2 | 58 | |
7b36e8ee ML |
59 | if (!atomic_inc_not_zero(&orig_node->refcount)) |
60 | orig_node = NULL; | |
43c70ad5 | 61 | |
5d02b3cd LL |
62 | out: |
63 | rcu_read_unlock(); | |
64 | return orig_node; | |
c6c8fea2 SE |
65 | } |
66 | ||
67 | void gw_deselect(struct bat_priv *bat_priv) | |
68 | { | |
5d02b3cd | 69 | struct gw_node *gw_node; |
c6c8fea2 | 70 | |
5d02b3cd LL |
71 | spin_lock_bh(&bat_priv->gw_list_lock); |
72 | gw_node = rcu_dereference(bat_priv->curr_gw); | |
73 | rcu_assign_pointer(bat_priv->curr_gw, NULL); | |
74 | spin_unlock_bh(&bat_priv->gw_list_lock); | |
c6c8fea2 SE |
75 | |
76 | if (gw_node) | |
25b6d3c1 | 77 | gw_node_free_ref(gw_node); |
c6c8fea2 SE |
78 | } |
79 | ||
25b6d3c1 | 80 | static void gw_select(struct bat_priv *bat_priv, struct gw_node *new_gw_node) |
c6c8fea2 | 81 | { |
5d02b3cd | 82 | struct gw_node *curr_gw_node; |
c6c8fea2 | 83 | |
25b6d3c1 ML |
84 | if (new_gw_node && !atomic_inc_not_zero(&new_gw_node->refcount)) |
85 | new_gw_node = NULL; | |
c6c8fea2 | 86 | |
5d02b3cd LL |
87 | spin_lock_bh(&bat_priv->gw_list_lock); |
88 | curr_gw_node = rcu_dereference(bat_priv->curr_gw); | |
89 | rcu_assign_pointer(bat_priv->curr_gw, new_gw_node); | |
90 | spin_unlock_bh(&bat_priv->gw_list_lock); | |
25b6d3c1 ML |
91 | |
92 | if (curr_gw_node) | |
93 | gw_node_free_ref(curr_gw_node); | |
c6c8fea2 SE |
94 | } |
95 | ||
96 | void gw_election(struct bat_priv *bat_priv) | |
97 | { | |
98 | struct hlist_node *node; | |
5d02b3cd | 99 | struct gw_node *gw_node, *curr_gw, *curr_gw_tmp = NULL; |
c6c8fea2 SE |
100 | uint8_t max_tq = 0; |
101 | uint32_t max_gw_factor = 0, tmp_gw_factor = 0; | |
102 | int down, up; | |
103 | ||
104 | /** | |
105 | * The batman daemon checks here if we already passed a full originator | |
106 | * cycle in order to make sure we don't choose the first gateway we | |
107 | * hear about. This check is based on the daemon's uptime which we | |
108 | * don't have. | |
109 | **/ | |
110 | if (atomic_read(&bat_priv->gw_mode) != GW_MODE_CLIENT) | |
111 | return; | |
112 | ||
5d02b3cd LL |
113 | rcu_read_lock(); |
114 | curr_gw = rcu_dereference(bat_priv->curr_gw); | |
115 | if (curr_gw) { | |
116 | rcu_read_unlock(); | |
c6c8fea2 | 117 | return; |
5d02b3cd | 118 | } |
c6c8fea2 | 119 | |
c6c8fea2 | 120 | if (hlist_empty(&bat_priv->gw_list)) { |
c6c8fea2 | 121 | |
5d02b3cd LL |
122 | if (curr_gw) { |
123 | rcu_read_unlock(); | |
c6c8fea2 SE |
124 | bat_dbg(DBG_BATMAN, bat_priv, |
125 | "Removing selected gateway - " | |
126 | "no gateway in range\n"); | |
127 | gw_deselect(bat_priv); | |
5d02b3cd LL |
128 | } else |
129 | rcu_read_unlock(); | |
c6c8fea2 SE |
130 | |
131 | return; | |
132 | } | |
133 | ||
134 | hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) { | |
135 | if (!gw_node->orig_node->router) | |
136 | continue; | |
137 | ||
138 | if (gw_node->deleted) | |
139 | continue; | |
140 | ||
141 | switch (atomic_read(&bat_priv->gw_sel_class)) { | |
142 | case 1: /* fast connection */ | |
143 | gw_bandwidth_to_kbit(gw_node->orig_node->gw_flags, | |
144 | &down, &up); | |
145 | ||
146 | tmp_gw_factor = (gw_node->orig_node->router->tq_avg * | |
147 | gw_node->orig_node->router->tq_avg * | |
148 | down * 100 * 100) / | |
149 | (TQ_LOCAL_WINDOW_SIZE * | |
150 | TQ_LOCAL_WINDOW_SIZE * 64); | |
151 | ||
152 | if ((tmp_gw_factor > max_gw_factor) || | |
153 | ((tmp_gw_factor == max_gw_factor) && | |
154 | (gw_node->orig_node->router->tq_avg > max_tq))) | |
155 | curr_gw_tmp = gw_node; | |
156 | break; | |
157 | ||
158 | default: /** | |
159 | * 2: stable connection (use best statistic) | |
160 | * 3: fast-switch (use best statistic but change as | |
161 | * soon as a better gateway appears) | |
162 | * XX: late-switch (use best statistic but change as | |
163 | * soon as a better gateway appears which has | |
164 | * $routing_class more tq points) | |
165 | **/ | |
166 | if (gw_node->orig_node->router->tq_avg > max_tq) | |
167 | curr_gw_tmp = gw_node; | |
168 | break; | |
169 | } | |
170 | ||
171 | if (gw_node->orig_node->router->tq_avg > max_tq) | |
172 | max_tq = gw_node->orig_node->router->tq_avg; | |
173 | ||
174 | if (tmp_gw_factor > max_gw_factor) | |
175 | max_gw_factor = tmp_gw_factor; | |
176 | } | |
177 | ||
5d02b3cd LL |
178 | if (curr_gw != curr_gw_tmp) { |
179 | if ((curr_gw) && (!curr_gw_tmp)) | |
c6c8fea2 SE |
180 | bat_dbg(DBG_BATMAN, bat_priv, |
181 | "Removing selected gateway - " | |
182 | "no gateway in range\n"); | |
5d02b3cd | 183 | else if ((!curr_gw) && (curr_gw_tmp)) |
c6c8fea2 SE |
184 | bat_dbg(DBG_BATMAN, bat_priv, |
185 | "Adding route to gateway %pM " | |
186 | "(gw_flags: %i, tq: %i)\n", | |
187 | curr_gw_tmp->orig_node->orig, | |
188 | curr_gw_tmp->orig_node->gw_flags, | |
189 | curr_gw_tmp->orig_node->router->tq_avg); | |
190 | else | |
191 | bat_dbg(DBG_BATMAN, bat_priv, | |
192 | "Changing route to gateway %pM " | |
193 | "(gw_flags: %i, tq: %i)\n", | |
194 | curr_gw_tmp->orig_node->orig, | |
195 | curr_gw_tmp->orig_node->gw_flags, | |
196 | curr_gw_tmp->orig_node->router->tq_avg); | |
197 | ||
25b6d3c1 | 198 | gw_select(bat_priv, curr_gw_tmp); |
c6c8fea2 SE |
199 | } |
200 | ||
201 | rcu_read_unlock(); | |
c6c8fea2 SE |
202 | } |
203 | ||
204 | void gw_check_election(struct bat_priv *bat_priv, struct orig_node *orig_node) | |
205 | { | |
5d02b3cd | 206 | struct gw_node *curr_gateway_tmp; |
c6c8fea2 SE |
207 | uint8_t gw_tq_avg, orig_tq_avg; |
208 | ||
5d02b3cd LL |
209 | rcu_read_lock(); |
210 | curr_gateway_tmp = rcu_dereference(bat_priv->curr_gw); | |
c6c8fea2 | 211 | if (!curr_gateway_tmp) |
5d02b3cd | 212 | goto out_rcu; |
c6c8fea2 SE |
213 | |
214 | if (!curr_gateway_tmp->orig_node) | |
5d02b3cd | 215 | goto deselect_rcu; |
c6c8fea2 SE |
216 | |
217 | if (!curr_gateway_tmp->orig_node->router) | |
5d02b3cd | 218 | goto deselect_rcu; |
c6c8fea2 SE |
219 | |
220 | /* this node already is the gateway */ | |
221 | if (curr_gateway_tmp->orig_node == orig_node) | |
5d02b3cd | 222 | goto out_rcu; |
c6c8fea2 SE |
223 | |
224 | if (!orig_node->router) | |
5d02b3cd | 225 | goto out_rcu; |
c6c8fea2 SE |
226 | |
227 | gw_tq_avg = curr_gateway_tmp->orig_node->router->tq_avg; | |
5d02b3cd LL |
228 | rcu_read_unlock(); |
229 | ||
c6c8fea2 SE |
230 | orig_tq_avg = orig_node->router->tq_avg; |
231 | ||
232 | /* the TQ value has to be better */ | |
233 | if (orig_tq_avg < gw_tq_avg) | |
5d02b3cd | 234 | goto out; |
c6c8fea2 SE |
235 | |
236 | /** | |
237 | * if the routing class is greater than 3 the value tells us how much | |
238 | * greater the TQ value of the new gateway must be | |
239 | **/ | |
240 | if ((atomic_read(&bat_priv->gw_sel_class) > 3) && | |
241 | (orig_tq_avg - gw_tq_avg < atomic_read(&bat_priv->gw_sel_class))) | |
5d02b3cd | 242 | goto out; |
c6c8fea2 SE |
243 | |
244 | bat_dbg(DBG_BATMAN, bat_priv, | |
245 | "Restarting gateway selection: better gateway found (tq curr: " | |
246 | "%i, tq new: %i)\n", | |
247 | gw_tq_avg, orig_tq_avg); | |
5d02b3cd | 248 | goto deselect; |
c6c8fea2 | 249 | |
5d02b3cd LL |
250 | out_rcu: |
251 | rcu_read_unlock(); | |
252 | goto out; | |
253 | deselect_rcu: | |
254 | rcu_read_unlock(); | |
c6c8fea2 SE |
255 | deselect: |
256 | gw_deselect(bat_priv); | |
5d02b3cd LL |
257 | out: |
258 | return; | |
c6c8fea2 SE |
259 | } |
260 | ||
261 | static void gw_node_add(struct bat_priv *bat_priv, | |
262 | struct orig_node *orig_node, uint8_t new_gwflags) | |
263 | { | |
264 | struct gw_node *gw_node; | |
265 | int down, up; | |
266 | ||
267 | gw_node = kmalloc(sizeof(struct gw_node), GFP_ATOMIC); | |
268 | if (!gw_node) | |
269 | return; | |
270 | ||
271 | memset(gw_node, 0, sizeof(struct gw_node)); | |
272 | INIT_HLIST_NODE(&gw_node->list); | |
273 | gw_node->orig_node = orig_node; | |
25b6d3c1 | 274 | atomic_set(&gw_node->refcount, 1); |
c6c8fea2 SE |
275 | |
276 | spin_lock_bh(&bat_priv->gw_list_lock); | |
277 | hlist_add_head_rcu(&gw_node->list, &bat_priv->gw_list); | |
278 | spin_unlock_bh(&bat_priv->gw_list_lock); | |
279 | ||
280 | gw_bandwidth_to_kbit(new_gwflags, &down, &up); | |
281 | bat_dbg(DBG_BATMAN, bat_priv, | |
282 | "Found new gateway %pM -> gw_class: %i - %i%s/%i%s\n", | |
283 | orig_node->orig, new_gwflags, | |
284 | (down > 2048 ? down / 1024 : down), | |
285 | (down > 2048 ? "MBit" : "KBit"), | |
286 | (up > 2048 ? up / 1024 : up), | |
287 | (up > 2048 ? "MBit" : "KBit")); | |
288 | } | |
289 | ||
290 | void gw_node_update(struct bat_priv *bat_priv, | |
291 | struct orig_node *orig_node, uint8_t new_gwflags) | |
292 | { | |
293 | struct hlist_node *node; | |
294 | struct gw_node *gw_node; | |
295 | ||
296 | rcu_read_lock(); | |
297 | hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) { | |
298 | if (gw_node->orig_node != orig_node) | |
299 | continue; | |
300 | ||
301 | bat_dbg(DBG_BATMAN, bat_priv, | |
302 | "Gateway class of originator %pM changed from " | |
303 | "%i to %i\n", | |
304 | orig_node->orig, gw_node->orig_node->gw_flags, | |
305 | new_gwflags); | |
306 | ||
307 | gw_node->deleted = 0; | |
308 | ||
309 | if (new_gwflags == 0) { | |
310 | gw_node->deleted = jiffies; | |
311 | bat_dbg(DBG_BATMAN, bat_priv, | |
312 | "Gateway %pM removed from gateway list\n", | |
313 | orig_node->orig); | |
314 | ||
5d02b3cd | 315 | if (gw_node == rcu_dereference(bat_priv->curr_gw)) { |
c6c8fea2 SE |
316 | rcu_read_unlock(); |
317 | gw_deselect(bat_priv); | |
318 | return; | |
319 | } | |
320 | } | |
321 | ||
322 | rcu_read_unlock(); | |
323 | return; | |
324 | } | |
325 | rcu_read_unlock(); | |
326 | ||
327 | if (new_gwflags == 0) | |
328 | return; | |
329 | ||
330 | gw_node_add(bat_priv, orig_node, new_gwflags); | |
331 | } | |
332 | ||
333 | void gw_node_delete(struct bat_priv *bat_priv, struct orig_node *orig_node) | |
334 | { | |
335 | return gw_node_update(bat_priv, orig_node, 0); | |
336 | } | |
337 | ||
338 | void gw_node_purge(struct bat_priv *bat_priv) | |
339 | { | |
340 | struct gw_node *gw_node; | |
341 | struct hlist_node *node, *node_tmp; | |
342 | unsigned long timeout = 2 * PURGE_TIMEOUT * HZ; | |
343 | ||
344 | spin_lock_bh(&bat_priv->gw_list_lock); | |
345 | ||
346 | hlist_for_each_entry_safe(gw_node, node, node_tmp, | |
347 | &bat_priv->gw_list, list) { | |
348 | if (((!gw_node->deleted) || | |
349 | (time_before(jiffies, gw_node->deleted + timeout))) && | |
350 | atomic_read(&bat_priv->mesh_state) == MESH_ACTIVE) | |
351 | continue; | |
352 | ||
5d02b3cd | 353 | if (rcu_dereference(bat_priv->curr_gw) == gw_node) |
c6c8fea2 SE |
354 | gw_deselect(bat_priv); |
355 | ||
356 | hlist_del_rcu(&gw_node->list); | |
25b6d3c1 | 357 | gw_node_free_ref(gw_node); |
c6c8fea2 SE |
358 | } |
359 | ||
360 | ||
361 | spin_unlock_bh(&bat_priv->gw_list_lock); | |
362 | } | |
363 | ||
364 | static int _write_buffer_text(struct bat_priv *bat_priv, | |
365 | struct seq_file *seq, struct gw_node *gw_node) | |
366 | { | |
5d02b3cd LL |
367 | struct gw_node *curr_gw; |
368 | int down, up, ret; | |
c6c8fea2 SE |
369 | |
370 | gw_bandwidth_to_kbit(gw_node->orig_node->gw_flags, &down, &up); | |
371 | ||
5d02b3cd LL |
372 | rcu_read_lock(); |
373 | curr_gw = rcu_dereference(bat_priv->curr_gw); | |
374 | ||
375 | ret = seq_printf(seq, "%s %pM (%3i) %pM [%10s]: %3i - %i%s/%i%s\n", | |
376 | (curr_gw == gw_node ? "=>" : " "), | |
c6c8fea2 SE |
377 | gw_node->orig_node->orig, |
378 | gw_node->orig_node->router->tq_avg, | |
379 | gw_node->orig_node->router->addr, | |
380 | gw_node->orig_node->router->if_incoming->net_dev->name, | |
381 | gw_node->orig_node->gw_flags, | |
382 | (down > 2048 ? down / 1024 : down), | |
383 | (down > 2048 ? "MBit" : "KBit"), | |
384 | (up > 2048 ? up / 1024 : up), | |
385 | (up > 2048 ? "MBit" : "KBit")); | |
5d02b3cd LL |
386 | |
387 | rcu_read_unlock(); | |
388 | return ret; | |
c6c8fea2 SE |
389 | } |
390 | ||
391 | int gw_client_seq_print_text(struct seq_file *seq, void *offset) | |
392 | { | |
393 | struct net_device *net_dev = (struct net_device *)seq->private; | |
394 | struct bat_priv *bat_priv = netdev_priv(net_dev); | |
395 | struct gw_node *gw_node; | |
396 | struct hlist_node *node; | |
397 | int gw_count = 0; | |
398 | ||
399 | if (!bat_priv->primary_if) { | |
400 | ||
401 | return seq_printf(seq, "BATMAN mesh %s disabled - please " | |
402 | "specify interfaces to enable it\n", | |
403 | net_dev->name); | |
404 | } | |
405 | ||
406 | if (bat_priv->primary_if->if_status != IF_ACTIVE) { | |
407 | ||
408 | return seq_printf(seq, "BATMAN mesh %s disabled - " | |
409 | "primary interface not active\n", | |
410 | net_dev->name); | |
411 | } | |
412 | ||
413 | seq_printf(seq, " %-12s (%s/%i) %17s [%10s]: gw_class ... " | |
414 | "[B.A.T.M.A.N. adv %s%s, MainIF/MAC: %s/%pM (%s)]\n", | |
415 | "Gateway", "#", TQ_MAX_VALUE, "Nexthop", | |
416 | "outgoingIF", SOURCE_VERSION, REVISION_VERSION_STR, | |
417 | bat_priv->primary_if->net_dev->name, | |
418 | bat_priv->primary_if->net_dev->dev_addr, net_dev->name); | |
419 | ||
420 | rcu_read_lock(); | |
421 | hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) { | |
422 | if (gw_node->deleted) | |
423 | continue; | |
424 | ||
425 | if (!gw_node->orig_node->router) | |
426 | continue; | |
427 | ||
428 | _write_buffer_text(bat_priv, seq, gw_node); | |
429 | gw_count++; | |
430 | } | |
431 | rcu_read_unlock(); | |
432 | ||
433 | if (gw_count == 0) | |
434 | seq_printf(seq, "No gateways in range ...\n"); | |
435 | ||
436 | return 0; | |
437 | } | |
438 | ||
439 | int gw_is_target(struct bat_priv *bat_priv, struct sk_buff *skb) | |
440 | { | |
441 | struct ethhdr *ethhdr; | |
442 | struct iphdr *iphdr; | |
443 | struct ipv6hdr *ipv6hdr; | |
444 | struct udphdr *udphdr; | |
445 | unsigned int header_len = 0; | |
446 | ||
447 | if (atomic_read(&bat_priv->gw_mode) == GW_MODE_OFF) | |
448 | return 0; | |
449 | ||
450 | /* check for ethernet header */ | |
451 | if (!pskb_may_pull(skb, header_len + ETH_HLEN)) | |
452 | return 0; | |
453 | ethhdr = (struct ethhdr *)skb->data; | |
454 | header_len += ETH_HLEN; | |
455 | ||
456 | /* check for initial vlan header */ | |
457 | if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) { | |
458 | if (!pskb_may_pull(skb, header_len + VLAN_HLEN)) | |
459 | return 0; | |
460 | ethhdr = (struct ethhdr *)(skb->data + VLAN_HLEN); | |
461 | header_len += VLAN_HLEN; | |
462 | } | |
463 | ||
464 | /* check for ip header */ | |
465 | switch (ntohs(ethhdr->h_proto)) { | |
466 | case ETH_P_IP: | |
467 | if (!pskb_may_pull(skb, header_len + sizeof(struct iphdr))) | |
468 | return 0; | |
469 | iphdr = (struct iphdr *)(skb->data + header_len); | |
470 | header_len += iphdr->ihl * 4; | |
471 | ||
472 | /* check for udp header */ | |
473 | if (iphdr->protocol != IPPROTO_UDP) | |
474 | return 0; | |
475 | ||
476 | break; | |
477 | case ETH_P_IPV6: | |
478 | if (!pskb_may_pull(skb, header_len + sizeof(struct ipv6hdr))) | |
479 | return 0; | |
480 | ipv6hdr = (struct ipv6hdr *)(skb->data + header_len); | |
481 | header_len += sizeof(struct ipv6hdr); | |
482 | ||
483 | /* check for udp header */ | |
484 | if (ipv6hdr->nexthdr != IPPROTO_UDP) | |
485 | return 0; | |
486 | ||
487 | break; | |
488 | default: | |
489 | return 0; | |
490 | } | |
491 | ||
492 | if (!pskb_may_pull(skb, header_len + sizeof(struct udphdr))) | |
493 | return 0; | |
494 | udphdr = (struct udphdr *)(skb->data + header_len); | |
495 | header_len += sizeof(struct udphdr); | |
496 | ||
497 | /* check for bootp port */ | |
498 | if ((ntohs(ethhdr->h_proto) == ETH_P_IP) && | |
499 | (ntohs(udphdr->dest) != 67)) | |
500 | return 0; | |
501 | ||
502 | if ((ntohs(ethhdr->h_proto) == ETH_P_IPV6) && | |
503 | (ntohs(udphdr->dest) != 547)) | |
504 | return 0; | |
505 | ||
506 | if (atomic_read(&bat_priv->gw_mode) == GW_MODE_SERVER) | |
507 | return -1; | |
508 | ||
5d02b3cd LL |
509 | rcu_read_lock(); |
510 | if (!rcu_dereference(bat_priv->curr_gw)) { | |
511 | rcu_read_unlock(); | |
c6c8fea2 | 512 | return 0; |
5d02b3cd LL |
513 | } |
514 | rcu_read_unlock(); | |
c6c8fea2 SE |
515 | |
516 | return 1; | |
517 | } |