blob: a7da2f4724791473608e2bb745fd293a889f07e1 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * ip6_flowlabel.c IPv6 flowlabel manager.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
10 */
11
Randy Dunlap4fc268d2006-01-11 12:17:47 -080012#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include <linux/errno.h>
14#include <linux/types.h>
15#include <linux/socket.h>
16#include <linux/net.h>
17#include <linux/netdevice.h>
18#include <linux/if_arp.h>
19#include <linux/in6.h>
20#include <linux/route.h>
21#include <linux/proc_fs.h>
22#include <linux/seq_file.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090023#include <linux/slab.h>
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040024#include <linux/export.h>
Eric W. Biederman4f82f452012-05-24 10:37:59 -060025#include <linux/pid_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026
Eric W. Biederman457c4cb2007-09-12 12:01:34 +020027#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include <net/sock.h>
29
30#include <net/ipv6.h>
31#include <net/ndisc.h>
32#include <net/protocol.h>
33#include <net/ip6_route.h>
34#include <net/addrconf.h>
35#include <net/rawv6.h>
36#include <net/icmp.h>
37#include <net/transp_v6.h>
38
39#include <asm/uaccess.h>
40
41#define FL_MIN_LINGER 6 /* Minimal linger. It is set to 6sec specified
42 in old IPv6 RFC. Well, it was reasonable value.
43 */
44#define FL_MAX_LINGER 60 /* Maximal linger timeout */
45
46/* FL hash table */
47
48#define FL_MAX_PER_SOCK 32
49#define FL_MAX_SIZE 4096
50#define FL_HASH_MASK 255
51#define FL_HASH(l) (ntohl(l)&FL_HASH_MASK)
52
53static atomic_t fl_size = ATOMIC_INIT(0);
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +000054static struct ip6_flowlabel __rcu *fl_ht[FL_HASH_MASK+1];
Linus Torvalds1da177e2005-04-16 15:20:36 -070055
56static void ip6_fl_gc(unsigned long dummy);
Ingo Molnar8d06afa2005-09-09 13:10:40 -070057static DEFINE_TIMER(ip6_fl_gc_timer, ip6_fl_gc, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
59/* FL hash table lock: it protects only of GC */
60
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +000061static DEFINE_SPINLOCK(ip6_fl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
63/* Big socket sock */
64
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +000065static DEFINE_SPINLOCK(ip6_sk_fl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070066
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +000067#define for_each_fl_rcu(hash, fl) \
Amerigo Wang6a98dcf2013-02-07 15:52:40 +000068 for (fl = rcu_dereference_bh(fl_ht[(hash)]); \
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +000069 fl != NULL; \
Amerigo Wang6a98dcf2013-02-07 15:52:40 +000070 fl = rcu_dereference_bh(fl->next))
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +000071#define for_each_fl_continue_rcu(fl) \
Amerigo Wang6a98dcf2013-02-07 15:52:40 +000072 for (fl = rcu_dereference_bh(fl->next); \
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +000073 fl != NULL; \
Amerigo Wang6a98dcf2013-02-07 15:52:40 +000074 fl = rcu_dereference_bh(fl->next))
Linus Torvalds1da177e2005-04-16 15:20:36 -070075
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +000076#define for_each_sk_fl_rcu(np, sfl) \
77 for (sfl = rcu_dereference_bh(np->ipv6_fl_list); \
78 sfl != NULL; \
79 sfl = rcu_dereference_bh(sfl->next))
80
Benjamin Thery60e8fbc2008-03-26 16:53:08 -070081static inline struct ip6_flowlabel *__fl_lookup(struct net *net, __be32 label)
Linus Torvalds1da177e2005-04-16 15:20:36 -070082{
83 struct ip6_flowlabel *fl;
84
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +000085 for_each_fl_rcu(FL_HASH(label), fl) {
Octavian Purdila09ad9bc2009-11-25 15:14:13 -080086 if (fl->label == label && net_eq(fl->fl_net, net))
Linus Torvalds1da177e2005-04-16 15:20:36 -070087 return fl;
88 }
89 return NULL;
90}
91
Benjamin Thery60e8fbc2008-03-26 16:53:08 -070092static struct ip6_flowlabel *fl_lookup(struct net *net, __be32 label)
Linus Torvalds1da177e2005-04-16 15:20:36 -070093{
94 struct ip6_flowlabel *fl;
95
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +000096 rcu_read_lock_bh();
Benjamin Thery60e8fbc2008-03-26 16:53:08 -070097 fl = __fl_lookup(net, label);
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +000098 if (fl && !atomic_inc_not_zero(&fl->users))
99 fl = NULL;
100 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 return fl;
102}
103
104
105static void fl_free(struct ip6_flowlabel *fl)
106{
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700107 if (fl) {
Dan Carpenter898132a2012-08-16 16:15:02 +0300108 if (fl->share == IPV6_FL_S_PROCESS)
109 put_pid(fl->owner.pid);
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700110 release_net(fl->fl_net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 kfree(fl->opt);
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000112 kfree_rcu(fl, rcu);
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700113 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114}
115
116static void fl_release(struct ip6_flowlabel *fl)
117{
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000118 spin_lock_bh(&ip6_fl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
120 fl->lastuse = jiffies;
121 if (atomic_dec_and_test(&fl->users)) {
122 unsigned long ttd = fl->lastuse + fl->linger;
123 if (time_after(ttd, fl->expires))
124 fl->expires = ttd;
125 ttd = fl->expires;
126 if (fl->opt && fl->share == IPV6_FL_S_EXCL) {
127 struct ipv6_txoptions *opt = fl->opt;
128 fl->opt = NULL;
129 kfree(opt);
130 }
131 if (!timer_pending(&ip6_fl_gc_timer) ||
132 time_after(ip6_fl_gc_timer.expires, ttd))
133 mod_timer(&ip6_fl_gc_timer, ttd);
134 }
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000135 spin_unlock_bh(&ip6_fl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136}
137
138static void ip6_fl_gc(unsigned long dummy)
139{
140 int i;
141 unsigned long now = jiffies;
142 unsigned long sched = 0;
143
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000144 spin_lock(&ip6_fl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145
146 for (i=0; i<=FL_HASH_MASK; i++) {
147 struct ip6_flowlabel *fl, **flp;
148 flp = &fl_ht[i];
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000149 while ((fl = rcu_dereference_protected(*flp,
150 lockdep_is_held(&ip6_fl_lock))) != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 if (atomic_read(&fl->users) == 0) {
152 unsigned long ttd = fl->lastuse + fl->linger;
153 if (time_after(ttd, fl->expires))
154 fl->expires = ttd;
155 ttd = fl->expires;
156 if (time_after_eq(now, ttd)) {
157 *flp = fl->next;
158 fl_free(fl);
159 atomic_dec(&fl_size);
160 continue;
161 }
162 if (!sched || time_before(ttd, sched))
163 sched = ttd;
164 }
165 flp = &fl->next;
166 }
167 }
168 if (!sched && atomic_read(&fl_size))
169 sched = now + FL_MAX_LINGER;
170 if (sched) {
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700171 mod_timer(&ip6_fl_gc_timer, sched);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 }
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000173 spin_unlock(&ip6_fl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174}
175
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000176static void __net_exit ip6_fl_purge(struct net *net)
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700177{
178 int i;
179
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000180 spin_lock(&ip6_fl_lock);
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700181 for (i = 0; i <= FL_HASH_MASK; i++) {
182 struct ip6_flowlabel *fl, **flp;
183 flp = &fl_ht[i];
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000184 while ((fl = rcu_dereference_protected(*flp,
185 lockdep_is_held(&ip6_fl_lock))) != NULL) {
Octavian Purdila09ad9bc2009-11-25 15:14:13 -0800186 if (net_eq(fl->fl_net, net) &&
187 atomic_read(&fl->users) == 0) {
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700188 *flp = fl->next;
189 fl_free(fl);
190 atomic_dec(&fl_size);
191 continue;
192 }
193 flp = &fl->next;
194 }
195 }
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000196 spin_unlock(&ip6_fl_lock);
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700197}
198
199static struct ip6_flowlabel *fl_intern(struct net *net,
200 struct ip6_flowlabel *fl, __be32 label)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201{
Pavel Emelyanov78c2e502007-10-18 05:18:56 -0700202 struct ip6_flowlabel *lfl;
203
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 fl->label = label & IPV6_FLOWLABEL_MASK;
205
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000206 spin_lock_bh(&ip6_fl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 if (label == 0) {
208 for (;;) {
209 fl->label = htonl(net_random())&IPV6_FLOWLABEL_MASK;
210 if (fl->label) {
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700211 lfl = __fl_lookup(net, fl->label);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 if (lfl == NULL)
213 break;
214 }
215 }
Pavel Emelyanov78c2e502007-10-18 05:18:56 -0700216 } else {
217 /*
218 * we dropper the ip6_fl_lock, so this entry could reappear
219 * and we need to recheck with it.
220 *
221 * OTOH no need to search the active socket first, like it is
222 * done in ipv6_flowlabel_opt - sock is locked, so new entry
223 * with the same label can only appear on another sock
224 */
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700225 lfl = __fl_lookup(net, fl->label);
Pavel Emelyanov78c2e502007-10-18 05:18:56 -0700226 if (lfl != NULL) {
227 atomic_inc(&lfl->users);
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000228 spin_unlock_bh(&ip6_fl_lock);
Pavel Emelyanov78c2e502007-10-18 05:18:56 -0700229 return lfl;
230 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 }
232
233 fl->lastuse = jiffies;
234 fl->next = fl_ht[FL_HASH(fl->label)];
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000235 rcu_assign_pointer(fl_ht[FL_HASH(fl->label)], fl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 atomic_inc(&fl_size);
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000237 spin_unlock_bh(&ip6_fl_lock);
Pavel Emelyanov78c2e502007-10-18 05:18:56 -0700238 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239}
240
241
242
243/* Socket flowlabel lists */
244
Al Viro90bcaf72006-11-08 00:25:17 -0800245struct ip6_flowlabel * fl6_sock_lookup(struct sock *sk, __be32 label)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246{
247 struct ipv6_fl_socklist *sfl;
248 struct ipv6_pinfo *np = inet6_sk(sk);
249
250 label &= IPV6_FLOWLABEL_MASK;
251
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000252 rcu_read_lock_bh();
253 for_each_sk_fl_rcu(np, sfl) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 struct ip6_flowlabel *fl = sfl->fl;
255 if (fl->label == label) {
256 fl->lastuse = jiffies;
257 atomic_inc(&fl->users);
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000258 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 return fl;
260 }
261 }
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000262 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 return NULL;
264}
265
Arnaldo Carvalho de Melo3cf3dc62005-12-13 23:23:20 -0800266EXPORT_SYMBOL_GPL(fl6_sock_lookup);
267
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268void fl6_free_socklist(struct sock *sk)
269{
270 struct ipv6_pinfo *np = inet6_sk(sk);
271 struct ipv6_fl_socklist *sfl;
272
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000273 if (!rcu_access_pointer(np->ipv6_fl_list))
YOSHIFUJI Hideaki / 吉藤英明f256dc52013-01-30 09:26:42 +0000274 return;
275
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000276 spin_lock_bh(&ip6_sk_fl_lock);
277 while ((sfl = rcu_dereference_protected(np->ipv6_fl_list,
278 lockdep_is_held(&ip6_sk_fl_lock))) != NULL) {
279 np->ipv6_fl_list = sfl->next;
280 spin_unlock_bh(&ip6_sk_fl_lock);
YOSHIFUJI Hideaki / 吉藤英明f256dc52013-01-30 09:26:42 +0000281
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 fl_release(sfl->fl);
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000283 kfree_rcu(sfl, rcu);
284
285 spin_lock_bh(&ip6_sk_fl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 }
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000287 spin_unlock_bh(&ip6_sk_fl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288}
289
290/* Service routines */
291
292
293/*
294 It is the only difficult place. flowlabel enforces equal headers
295 before and including routing header, however user may supply options
296 following rthdr.
297 */
298
299struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
300 struct ip6_flowlabel * fl,
301 struct ipv6_txoptions * fopt)
302{
YOSHIFUJI Hideakidf9890c2005-11-20 12:23:18 +0900303 struct ipv6_txoptions * fl_opt = fl->opt;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900304
YOSHIFUJI Hideakidf9890c2005-11-20 12:23:18 +0900305 if (fopt == NULL || fopt->opt_flen == 0)
306 return fl_opt;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900307
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 if (fl_opt != NULL) {
309 opt_space->hopopt = fl_opt->hopopt;
YOSHIFUJI Hideakidf9890c2005-11-20 12:23:18 +0900310 opt_space->dst0opt = fl_opt->dst0opt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 opt_space->srcrt = fl_opt->srcrt;
312 opt_space->opt_nflen = fl_opt->opt_nflen;
313 } else {
314 if (fopt->opt_nflen == 0)
315 return fopt;
316 opt_space->hopopt = NULL;
317 opt_space->dst0opt = NULL;
318 opt_space->srcrt = NULL;
319 opt_space->opt_nflen = 0;
320 }
321 opt_space->dst1opt = fopt->dst1opt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 opt_space->opt_flen = fopt->opt_flen;
323 return opt_space;
324}
Chris Elstona495f832012-04-29 21:48:53 +0000325EXPORT_SYMBOL_GPL(fl6_merge_options);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326
327static unsigned long check_linger(unsigned long ttl)
328{
329 if (ttl < FL_MIN_LINGER)
330 return FL_MIN_LINGER*HZ;
331 if (ttl > FL_MAX_LINGER && !capable(CAP_NET_ADMIN))
332 return 0;
333 return ttl*HZ;
334}
335
336static int fl6_renew(struct ip6_flowlabel *fl, unsigned long linger, unsigned long expires)
337{
338 linger = check_linger(linger);
339 if (!linger)
340 return -EPERM;
341 expires = check_linger(expires);
342 if (!expires)
343 return -EPERM;
344 fl->lastuse = jiffies;
345 if (time_before(fl->linger, linger))
346 fl->linger = linger;
347 if (time_before(expires, fl->linger))
348 expires = fl->linger;
349 if (time_before(fl->expires, fl->lastuse + expires))
350 fl->expires = fl->lastuse + expires;
351 return 0;
352}
353
354static struct ip6_flowlabel *
Maciej Żenczykowskiec0506d2011-08-28 12:35:31 +0000355fl_create(struct net *net, struct sock *sk, struct in6_flowlabel_req *freq,
356 char __user *optval, int optlen, int *err_p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357{
David S. Miller684de402009-02-06 00:49:55 -0800358 struct ip6_flowlabel *fl = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 int olen;
360 int addr_type;
361 int err;
362
David S. Miller684de402009-02-06 00:49:55 -0800363 olen = optlen - CMSG_ALIGN(sizeof(*freq));
364 err = -EINVAL;
365 if (olen > 64 * 1024)
366 goto done;
367
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 err = -ENOMEM;
Ingo Oeser0c600ed2006-03-20 23:01:32 -0800369 fl = kzalloc(sizeof(*fl), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 if (fl == NULL)
371 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 if (olen > 0) {
374 struct msghdr msg;
David S. Miller4c9483b2011-03-12 16:22:43 -0500375 struct flowi6 flowi6;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 int junk;
377
378 err = -ENOMEM;
379 fl->opt = kmalloc(sizeof(*fl->opt) + olen, GFP_KERNEL);
380 if (fl->opt == NULL)
381 goto done;
382
383 memset(fl->opt, 0, sizeof(*fl->opt));
384 fl->opt->tot_len = sizeof(*fl->opt) + olen;
385 err = -EFAULT;
386 if (copy_from_user(fl->opt+1, optval+CMSG_ALIGN(sizeof(*freq)), olen))
387 goto done;
388
389 msg.msg_controllen = olen;
390 msg.msg_control = (void*)(fl->opt+1);
David S. Miller4c9483b2011-03-12 16:22:43 -0500391 memset(&flowi6, 0, sizeof(flowi6));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392
Tom Parkin73df66f2013-01-31 01:02:24 +0000393 err = ip6_datagram_send_ctl(net, sk, &msg, &flowi6, fl->opt,
394 &junk, &junk, &junk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 if (err)
396 goto done;
397 err = -EINVAL;
398 if (fl->opt->opt_flen)
399 goto done;
400 if (fl->opt->opt_nflen == 0) {
401 kfree(fl->opt);
402 fl->opt = NULL;
403 }
404 }
405
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700406 fl->fl_net = hold_net(net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 fl->expires = jiffies;
408 err = fl6_renew(fl, freq->flr_linger, freq->flr_expires);
409 if (err)
410 goto done;
411 fl->share = freq->flr_share;
412 addr_type = ipv6_addr_type(&freq->flr_dst);
Joe Perches35700212009-11-24 14:52:52 -0800413 if ((addr_type & IPV6_ADDR_MAPPED) ||
414 addr_type == IPV6_ADDR_ANY) {
James Morrisc6817e42006-10-30 18:56:06 -0800415 err = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 goto done;
James Morrisc6817e42006-10-30 18:56:06 -0800417 }
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000418 fl->dst = freq->flr_dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 atomic_set(&fl->users, 1);
420 switch (fl->share) {
421 case IPV6_FL_S_EXCL:
422 case IPV6_FL_S_ANY:
423 break;
424 case IPV6_FL_S_PROCESS:
Eric W. Biederman4f82f452012-05-24 10:37:59 -0600425 fl->owner.pid = get_task_pid(current, PIDTYPE_PID);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 break;
427 case IPV6_FL_S_USER:
Eric W. Biederman4f82f452012-05-24 10:37:59 -0600428 fl->owner.uid = current_euid();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 break;
430 default:
431 err = -EINVAL;
432 goto done;
433 }
434 return fl;
435
436done:
437 fl_free(fl);
438 *err_p = err;
439 return NULL;
440}
441
442static int mem_check(struct sock *sk)
443{
444 struct ipv6_pinfo *np = inet6_sk(sk);
445 struct ipv6_fl_socklist *sfl;
446 int room = FL_MAX_SIZE - atomic_read(&fl_size);
447 int count = 0;
448
449 if (room > FL_MAX_SIZE - FL_MAX_PER_SOCK)
450 return 0;
451
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000452 for_each_sk_fl_rcu(np, sfl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 count++;
454
455 if (room <= 0 ||
456 ((count >= FL_MAX_PER_SOCK ||
Joe Perches35700212009-11-24 14:52:52 -0800457 (count > 0 && room < FL_MAX_SIZE/2) || room < FL_MAX_SIZE/4) &&
458 !capable(CAP_NET_ADMIN)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 return -ENOBUFS;
460
461 return 0;
462}
463
Eric Dumazeta50feda2012-05-18 18:57:34 +0000464static bool ipv6_hdr_cmp(struct ipv6_opt_hdr *h1, struct ipv6_opt_hdr *h2)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465{
466 if (h1 == h2)
Eric Dumazeta50feda2012-05-18 18:57:34 +0000467 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468 if (h1 == NULL || h2 == NULL)
Eric Dumazeta50feda2012-05-18 18:57:34 +0000469 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 if (h1->hdrlen != h2->hdrlen)
Eric Dumazeta50feda2012-05-18 18:57:34 +0000471 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472 return memcmp(h1+1, h2+1, ((h1->hdrlen+1)<<3) - sizeof(*h1));
473}
474
Eric Dumazeta50feda2012-05-18 18:57:34 +0000475static bool ipv6_opt_cmp(struct ipv6_txoptions *o1, struct ipv6_txoptions *o2)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476{
477 if (o1 == o2)
Eric Dumazeta50feda2012-05-18 18:57:34 +0000478 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 if (o1 == NULL || o2 == NULL)
Eric Dumazeta50feda2012-05-18 18:57:34 +0000480 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 if (o1->opt_nflen != o2->opt_nflen)
Eric Dumazeta50feda2012-05-18 18:57:34 +0000482 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 if (ipv6_hdr_cmp(o1->hopopt, o2->hopopt))
Eric Dumazeta50feda2012-05-18 18:57:34 +0000484 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 if (ipv6_hdr_cmp(o1->dst0opt, o2->dst0opt))
Eric Dumazeta50feda2012-05-18 18:57:34 +0000486 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 if (ipv6_hdr_cmp((struct ipv6_opt_hdr *)o1->srcrt, (struct ipv6_opt_hdr *)o2->srcrt))
Eric Dumazeta50feda2012-05-18 18:57:34 +0000488 return true;
489 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490}
491
Pavel Emelyanov04028042007-10-18 05:14:58 -0700492static inline void fl_link(struct ipv6_pinfo *np, struct ipv6_fl_socklist *sfl,
493 struct ip6_flowlabel *fl)
494{
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000495 spin_lock_bh(&ip6_sk_fl_lock);
Pavel Emelyanov04028042007-10-18 05:14:58 -0700496 sfl->fl = fl;
497 sfl->next = np->ipv6_fl_list;
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000498 rcu_assign_pointer(np->ipv6_fl_list, sfl);
499 spin_unlock_bh(&ip6_sk_fl_lock);
Pavel Emelyanov04028042007-10-18 05:14:58 -0700500}
501
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen)
503{
Ingo Molnar55205d42008-11-25 16:50:30 -0800504 int uninitialized_var(err);
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700505 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 struct ipv6_pinfo *np = inet6_sk(sk);
507 struct in6_flowlabel_req freq;
508 struct ipv6_fl_socklist *sfl1=NULL;
509 struct ipv6_fl_socklist *sfl, **sflp;
Pavel Emelyanov78c2e502007-10-18 05:18:56 -0700510 struct ip6_flowlabel *fl, *fl1 = NULL;
511
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512
513 if (optlen < sizeof(freq))
514 return -EINVAL;
515
516 if (copy_from_user(&freq, optval, sizeof(freq)))
517 return -EFAULT;
518
519 switch (freq.flr_action) {
520 case IPV6_FL_A_PUT:
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000521 spin_lock_bh(&ip6_sk_fl_lock);
522 for (sflp = &np->ipv6_fl_list;
523 (sfl = rcu_dereference(*sflp))!=NULL;
524 sflp = &sfl->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525 if (sfl->fl->label == freq.flr_label) {
526 if (freq.flr_label == (np->flow_label&IPV6_FLOWLABEL_MASK))
527 np->flow_label &= ~IPV6_FLOWLABEL_MASK;
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000528 *sflp = rcu_dereference(sfl->next);
529 spin_unlock_bh(&ip6_sk_fl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530 fl_release(sfl->fl);
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000531 kfree_rcu(sfl, rcu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 return 0;
533 }
534 }
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000535 spin_unlock_bh(&ip6_sk_fl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 return -ESRCH;
537
538 case IPV6_FL_A_RENEW:
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000539 rcu_read_lock_bh();
540 for_each_sk_fl_rcu(np, sfl) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 if (sfl->fl->label == freq.flr_label) {
542 err = fl6_renew(sfl->fl, freq.flr_linger, freq.flr_expires);
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000543 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 return err;
545 }
546 }
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000547 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548
Eric W. Biedermanaf31f412012-11-16 03:03:06 +0000549 if (freq.flr_share == IPV6_FL_S_NONE &&
550 ns_capable(net->user_ns, CAP_NET_ADMIN)) {
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700551 fl = fl_lookup(net, freq.flr_label);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 if (fl) {
553 err = fl6_renew(fl, freq.flr_linger, freq.flr_expires);
554 fl_release(fl);
555 return err;
556 }
557 }
558 return -ESRCH;
559
560 case IPV6_FL_A_GET:
561 if (freq.flr_label & ~IPV6_FLOWLABEL_MASK)
562 return -EINVAL;
563
Maciej Żenczykowskiec0506d2011-08-28 12:35:31 +0000564 fl = fl_create(net, sk, &freq, optval, optlen, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 if (fl == NULL)
566 return err;
567 sfl1 = kmalloc(sizeof(*sfl1), GFP_KERNEL);
568
569 if (freq.flr_label) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 err = -EEXIST;
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000571 rcu_read_lock_bh();
572 for_each_sk_fl_rcu(np, sfl) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 if (sfl->fl->label == freq.flr_label) {
574 if (freq.flr_flags&IPV6_FL_F_EXCL) {
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000575 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 goto done;
577 }
578 fl1 = sfl->fl;
Yan Zheng4ea6a802005-10-24 19:55:23 +0800579 atomic_inc(&fl1->users);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580 break;
581 }
582 }
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000583 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584
585 if (fl1 == NULL)
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700586 fl1 = fl_lookup(net, freq.flr_label);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587 if (fl1) {
Pavel Emelyanov78c2e502007-10-18 05:18:56 -0700588recheck:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589 err = -EEXIST;
590 if (freq.flr_flags&IPV6_FL_F_EXCL)
591 goto release;
592 err = -EPERM;
593 if (fl1->share == IPV6_FL_S_EXCL ||
594 fl1->share != fl->share ||
Eric W. Biederman4f82f452012-05-24 10:37:59 -0600595 ((fl1->share == IPV6_FL_S_PROCESS) &&
596 (fl1->owner.pid == fl->owner.pid)) ||
597 ((fl1->share == IPV6_FL_S_USER) &&
598 uid_eq(fl1->owner.uid, fl->owner.uid)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599 goto release;
600
601 err = -EINVAL;
602 if (!ipv6_addr_equal(&fl1->dst, &fl->dst) ||
603 ipv6_opt_cmp(fl1->opt, fl->opt))
604 goto release;
605
606 err = -ENOMEM;
607 if (sfl1 == NULL)
608 goto release;
609 if (fl->linger > fl1->linger)
610 fl1->linger = fl->linger;
611 if ((long)(fl->expires - fl1->expires) > 0)
612 fl1->expires = fl->expires;
Pavel Emelyanov04028042007-10-18 05:14:58 -0700613 fl_link(np, sfl1, fl1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 fl_free(fl);
615 return 0;
616
617release:
618 fl_release(fl1);
619 goto done;
620 }
621 }
622 err = -ENOENT;
623 if (!(freq.flr_flags&IPV6_FL_F_CREATE))
624 goto done;
625
626 err = -ENOMEM;
627 if (sfl1 == NULL || (err = mem_check(sk)) != 0)
628 goto done;
629
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700630 fl1 = fl_intern(net, fl, freq.flr_label);
Pavel Emelyanov78c2e502007-10-18 05:18:56 -0700631 if (fl1 != NULL)
632 goto recheck;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633
David S. Miller6c94d362005-05-29 20:28:01 -0700634 if (!freq.flr_label) {
635 if (copy_to_user(&((struct in6_flowlabel_req __user *) optval)->flr_label,
636 &fl->label, sizeof(fl->label))) {
637 /* Intentionally ignore fault. */
638 }
639 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640
Pavel Emelyanov04028042007-10-18 05:14:58 -0700641 fl_link(np, sfl1, fl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642 return 0;
643
644 default:
645 return -EINVAL;
646 }
647
648done:
649 fl_free(fl);
650 kfree(sfl1);
651 return err;
652}
653
654#ifdef CONFIG_PROC_FS
655
656struct ip6fl_iter_state {
Benjamin Thery5983a3d2008-03-26 16:53:30 -0700657 struct seq_net_private p;
Eric W. Biederman4f82f452012-05-24 10:37:59 -0600658 struct pid_namespace *pid_ns;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659 int bucket;
660};
661
662#define ip6fl_seq_private(seq) ((struct ip6fl_iter_state *)(seq)->private)
663
664static struct ip6_flowlabel *ip6fl_get_first(struct seq_file *seq)
665{
666 struct ip6_flowlabel *fl = NULL;
667 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
Benjamin Thery5983a3d2008-03-26 16:53:30 -0700668 struct net *net = seq_file_net(seq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669
670 for (state->bucket = 0; state->bucket <= FL_HASH_MASK; ++state->bucket) {
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000671 for_each_fl_rcu(state->bucket, fl) {
672 if (net_eq(fl->fl_net, net))
673 goto out;
674 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675 }
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000676 fl = NULL;
677out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678 return fl;
679}
680
681static struct ip6_flowlabel *ip6fl_get_next(struct seq_file *seq, struct ip6_flowlabel *fl)
682{
683 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
Benjamin Thery5983a3d2008-03-26 16:53:30 -0700684 struct net *net = seq_file_net(seq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000686 for_each_fl_continue_rcu(fl) {
687 if (net_eq(fl->fl_net, net))
688 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689 }
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000690
691try_again:
692 if (++state->bucket <= FL_HASH_MASK) {
693 for_each_fl_rcu(state->bucket, fl) {
694 if (net_eq(fl->fl_net, net))
695 goto out;
696 }
697 goto try_again;
698 }
699 fl = NULL;
700
701out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702 return fl;
703}
704
705static struct ip6_flowlabel *ip6fl_get_idx(struct seq_file *seq, loff_t pos)
706{
707 struct ip6_flowlabel *fl = ip6fl_get_first(seq);
708 if (fl)
709 while (pos && (fl = ip6fl_get_next(seq, fl)) != NULL)
710 --pos;
711 return pos ? NULL : fl;
712}
713
714static void *ip6fl_seq_start(struct seq_file *seq, loff_t *pos)
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000715 __acquires(RCU)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716{
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000717 rcu_read_lock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718 return *pos ? ip6fl_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
719}
720
721static void *ip6fl_seq_next(struct seq_file *seq, void *v, loff_t *pos)
722{
723 struct ip6_flowlabel *fl;
724
725 if (v == SEQ_START_TOKEN)
726 fl = ip6fl_get_first(seq);
727 else
728 fl = ip6fl_get_next(seq, v);
729 ++*pos;
730 return fl;
731}
732
733static void ip6fl_seq_stop(struct seq_file *seq, void *v)
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000734 __releases(RCU)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735{
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000736 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737}
738
James Morris1b7c2db2006-10-31 00:43:44 -0800739static int ip6fl_seq_show(struct seq_file *seq, void *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740{
Eric W. Biederman4f82f452012-05-24 10:37:59 -0600741 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
James Morris1b7c2db2006-10-31 00:43:44 -0800742 if (v == SEQ_START_TOKEN)
743 seq_printf(seq, "%-5s %-1s %-6s %-6s %-6s %-8s %-32s %s\n",
744 "Label", "S", "Owner", "Users", "Linger", "Expires", "Dst", "Opt");
745 else {
746 struct ip6_flowlabel *fl = v;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747 seq_printf(seq,
Harvey Harrison4b7a4272008-10-29 12:50:24 -0700748 "%05X %-1d %-6d %-6d %-6ld %-8ld %pi6 %-4d\n",
Eric Dumazet95c96172012-04-15 05:58:06 +0000749 (unsigned int)ntohl(fl->label),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750 fl->share,
Eric W. Biederman4f82f452012-05-24 10:37:59 -0600751 ((fl->share == IPV6_FL_S_PROCESS) ?
752 pid_nr_ns(fl->owner.pid, state->pid_ns) :
753 ((fl->share == IPV6_FL_S_USER) ?
754 from_kuid_munged(seq_user_ns(seq), fl->owner.uid) :
755 0)),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756 atomic_read(&fl->users),
757 fl->linger/HZ,
758 (long)(fl->expires - jiffies)/HZ,
Harvey Harrisonb0711952008-10-28 16:05:40 -0700759 &fl->dst,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760 fl->opt ? fl->opt->opt_nflen : 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762 return 0;
763}
764
Philippe De Muyter56b3d972007-07-10 23:07:31 -0700765static const struct seq_operations ip6fl_seq_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766 .start = ip6fl_seq_start,
767 .next = ip6fl_seq_next,
768 .stop = ip6fl_seq_stop,
769 .show = ip6fl_seq_show,
770};
771
772static int ip6fl_seq_open(struct inode *inode, struct file *file)
773{
Eric W. Biederman4f82f452012-05-24 10:37:59 -0600774 struct seq_file *seq;
775 struct ip6fl_iter_state *state;
776 int err;
777
778 err = seq_open_net(inode, file, &ip6fl_seq_ops,
779 sizeof(struct ip6fl_iter_state));
780
781 if (!err) {
782 seq = file->private_data;
783 state = ip6fl_seq_private(seq);
784 rcu_read_lock();
785 state->pid_ns = get_pid_ns(task_active_pid_ns(current));
786 rcu_read_unlock();
787 }
788 return err;
789}
790
791static int ip6fl_seq_release(struct inode *inode, struct file *file)
792{
793 struct seq_file *seq = file->private_data;
794 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
795 put_pid_ns(state->pid_ns);
796 return seq_release_net(inode, file);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797}
798
Arjan van de Ven9a321442007-02-12 00:55:35 -0800799static const struct file_operations ip6fl_seq_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800 .owner = THIS_MODULE,
801 .open = ip6fl_seq_open,
802 .read = seq_read,
803 .llseek = seq_lseek,
Eric W. Biederman4f82f452012-05-24 10:37:59 -0600804 .release = ip6fl_seq_release,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000807static int __net_init ip6_flowlabel_proc_init(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808{
Benjamin Thery5983a3d2008-03-26 16:53:30 -0700809 if (!proc_net_fops_create(net, "ip6_flowlabel",
810 S_IRUGO, &ip6fl_seq_fops))
Daniel Lezcano0a3e78a2007-12-11 02:23:18 -0800811 return -ENOMEM;
812 return 0;
813}
814
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000815static void __net_exit ip6_flowlabel_proc_fini(struct net *net)
Daniel Lezcano0a3e78a2007-12-11 02:23:18 -0800816{
817 proc_net_remove(net, "ip6_flowlabel");
818}
819#else
820static inline int ip6_flowlabel_proc_init(struct net *net)
821{
822 return 0;
823}
824static inline void ip6_flowlabel_proc_fini(struct net *net)
825{
Daniel Lezcano0a3e78a2007-12-11 02:23:18 -0800826}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827#endif
Daniel Lezcano0a3e78a2007-12-11 02:23:18 -0800828
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000829static void __net_exit ip6_flowlabel_net_exit(struct net *net)
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700830{
831 ip6_fl_purge(net);
Benjamin Thery5983a3d2008-03-26 16:53:30 -0700832 ip6_flowlabel_proc_fini(net);
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700833}
834
835static struct pernet_operations ip6_flowlabel_net_ops = {
Benjamin Thery5983a3d2008-03-26 16:53:30 -0700836 .init = ip6_flowlabel_proc_init,
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700837 .exit = ip6_flowlabel_net_exit,
838};
839
Daniel Lezcano0a3e78a2007-12-11 02:23:18 -0800840int ip6_flowlabel_init(void)
841{
Benjamin Thery5983a3d2008-03-26 16:53:30 -0700842 return register_pernet_subsys(&ip6_flowlabel_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843}
844
845void ip6_flowlabel_cleanup(void)
846{
847 del_timer(&ip6_fl_gc_timer);
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700848 unregister_pernet_subsys(&ip6_flowlabel_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849}