blob: 3dd7d4ebd7cd9dff75c7a89a3a872cf8a073543b [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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include <linux/in6.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <linux/proc_fs.h>
20#include <linux/seq_file.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090021#include <linux/slab.h>
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040022#include <linux/export.h>
Eric W. Biederman4f82f452012-05-24 10:37:59 -060023#include <linux/pid_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024
Eric W. Biederman457c4cb2007-09-12 12:01:34 +020025#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include <net/sock.h>
27
28#include <net/ipv6.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <net/rawv6.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include <net/transp_v6.h>
31
32#include <asm/uaccess.h>
33
34#define FL_MIN_LINGER 6 /* Minimal linger. It is set to 6sec specified
35 in old IPv6 RFC. Well, it was reasonable value.
36 */
Florent Fourcot53b47102013-11-07 17:53:13 +010037#define FL_MAX_LINGER 150 /* Maximal linger timeout */
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
39/* FL hash table */
40
41#define FL_MAX_PER_SOCK 32
42#define FL_MAX_SIZE 4096
43#define FL_HASH_MASK 255
44#define FL_HASH(l) (ntohl(l)&FL_HASH_MASK)
45
46static atomic_t fl_size = ATOMIC_INIT(0);
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +000047static struct ip6_flowlabel __rcu *fl_ht[FL_HASH_MASK+1];
Linus Torvalds1da177e2005-04-16 15:20:36 -070048
49static void ip6_fl_gc(unsigned long dummy);
Ingo Molnar8d06afa2005-09-09 13:10:40 -070050static DEFINE_TIMER(ip6_fl_gc_timer, ip6_fl_gc, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
52/* FL hash table lock: it protects only of GC */
53
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +000054static DEFINE_SPINLOCK(ip6_fl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070055
56/* Big socket sock */
57
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +000058static DEFINE_SPINLOCK(ip6_sk_fl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070059
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +000060#define for_each_fl_rcu(hash, fl) \
Amerigo Wang6a98dcf2013-02-07 15:52:40 +000061 for (fl = rcu_dereference_bh(fl_ht[(hash)]); \
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +000062 fl != NULL; \
Amerigo Wang6a98dcf2013-02-07 15:52:40 +000063 fl = rcu_dereference_bh(fl->next))
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +000064#define for_each_fl_continue_rcu(fl) \
Amerigo Wang6a98dcf2013-02-07 15:52:40 +000065 for (fl = rcu_dereference_bh(fl->next); \
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +000066 fl != NULL; \
Amerigo Wang6a98dcf2013-02-07 15:52:40 +000067 fl = rcu_dereference_bh(fl->next))
Linus Torvalds1da177e2005-04-16 15:20:36 -070068
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +000069#define for_each_sk_fl_rcu(np, sfl) \
70 for (sfl = rcu_dereference_bh(np->ipv6_fl_list); \
71 sfl != NULL; \
72 sfl = rcu_dereference_bh(sfl->next))
73
Benjamin Thery60e8fbc2008-03-26 16:53:08 -070074static inline struct ip6_flowlabel *__fl_lookup(struct net *net, __be32 label)
Linus Torvalds1da177e2005-04-16 15:20:36 -070075{
76 struct ip6_flowlabel *fl;
77
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +000078 for_each_fl_rcu(FL_HASH(label), fl) {
Octavian Purdila09ad9bc2009-11-25 15:14:13 -080079 if (fl->label == label && net_eq(fl->fl_net, net))
Linus Torvalds1da177e2005-04-16 15:20:36 -070080 return fl;
81 }
82 return NULL;
83}
84
Benjamin Thery60e8fbc2008-03-26 16:53:08 -070085static struct ip6_flowlabel *fl_lookup(struct net *net, __be32 label)
Linus Torvalds1da177e2005-04-16 15:20:36 -070086{
87 struct ip6_flowlabel *fl;
88
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +000089 rcu_read_lock_bh();
Benjamin Thery60e8fbc2008-03-26 16:53:08 -070090 fl = __fl_lookup(net, label);
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +000091 if (fl && !atomic_inc_not_zero(&fl->users))
92 fl = NULL;
93 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 return fl;
95}
96
97
98static void fl_free(struct ip6_flowlabel *fl)
99{
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700100 if (fl) {
Dan Carpenter898132a2012-08-16 16:15:02 +0300101 if (fl->share == IPV6_FL_S_PROCESS)
102 put_pid(fl->owner.pid);
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700103 release_net(fl->fl_net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 kfree(fl->opt);
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000105 kfree_rcu(fl, rcu);
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700106 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107}
108
109static void fl_release(struct ip6_flowlabel *fl)
110{
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000111 spin_lock_bh(&ip6_fl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112
113 fl->lastuse = jiffies;
114 if (atomic_dec_and_test(&fl->users)) {
115 unsigned long ttd = fl->lastuse + fl->linger;
116 if (time_after(ttd, fl->expires))
117 fl->expires = ttd;
118 ttd = fl->expires;
119 if (fl->opt && fl->share == IPV6_FL_S_EXCL) {
120 struct ipv6_txoptions *opt = fl->opt;
121 fl->opt = NULL;
122 kfree(opt);
123 }
124 if (!timer_pending(&ip6_fl_gc_timer) ||
125 time_after(ip6_fl_gc_timer.expires, ttd))
126 mod_timer(&ip6_fl_gc_timer, ttd);
127 }
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000128 spin_unlock_bh(&ip6_fl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129}
130
131static void ip6_fl_gc(unsigned long dummy)
132{
133 int i;
134 unsigned long now = jiffies;
135 unsigned long sched = 0;
136
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000137 spin_lock(&ip6_fl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
Ian Morris67ba4152014-08-24 21:53:10 +0100139 for (i = 0; i <= FL_HASH_MASK; i++) {
Eric Dumazet7f0e44a2013-03-07 04:20:32 +0000140 struct ip6_flowlabel *fl;
141 struct ip6_flowlabel __rcu **flp;
142
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 flp = &fl_ht[i];
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000144 while ((fl = rcu_dereference_protected(*flp,
145 lockdep_is_held(&ip6_fl_lock))) != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 if (atomic_read(&fl->users) == 0) {
147 unsigned long ttd = fl->lastuse + fl->linger;
148 if (time_after(ttd, fl->expires))
149 fl->expires = ttd;
150 ttd = fl->expires;
151 if (time_after_eq(now, ttd)) {
152 *flp = fl->next;
153 fl_free(fl);
154 atomic_dec(&fl_size);
155 continue;
156 }
157 if (!sched || time_before(ttd, sched))
158 sched = ttd;
159 }
160 flp = &fl->next;
161 }
162 }
163 if (!sched && atomic_read(&fl_size))
164 sched = now + FL_MAX_LINGER;
165 if (sched) {
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700166 mod_timer(&ip6_fl_gc_timer, sched);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 }
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000168 spin_unlock(&ip6_fl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169}
170
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000171static void __net_exit ip6_fl_purge(struct net *net)
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700172{
173 int i;
174
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000175 spin_lock(&ip6_fl_lock);
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700176 for (i = 0; i <= FL_HASH_MASK; i++) {
Eric Dumazet7f0e44a2013-03-07 04:20:32 +0000177 struct ip6_flowlabel *fl;
178 struct ip6_flowlabel __rcu **flp;
179
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700180 flp = &fl_ht[i];
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000181 while ((fl = rcu_dereference_protected(*flp,
182 lockdep_is_held(&ip6_fl_lock))) != NULL) {
Octavian Purdila09ad9bc2009-11-25 15:14:13 -0800183 if (net_eq(fl->fl_net, net) &&
184 atomic_read(&fl->users) == 0) {
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700185 *flp = fl->next;
186 fl_free(fl);
187 atomic_dec(&fl_size);
188 continue;
189 }
190 flp = &fl->next;
191 }
192 }
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000193 spin_unlock(&ip6_fl_lock);
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700194}
195
196static struct ip6_flowlabel *fl_intern(struct net *net,
197 struct ip6_flowlabel *fl, __be32 label)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198{
Pavel Emelyanov78c2e502007-10-18 05:18:56 -0700199 struct ip6_flowlabel *lfl;
200
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 fl->label = label & IPV6_FLOWLABEL_MASK;
202
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000203 spin_lock_bh(&ip6_fl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 if (label == 0) {
205 for (;;) {
Aruna-Hewapathirane63862b52014-01-11 07:15:59 -0500206 fl->label = htonl(prandom_u32())&IPV6_FLOWLABEL_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 if (fl->label) {
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700208 lfl = __fl_lookup(net, fl->label);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 if (lfl == NULL)
210 break;
211 }
212 }
Pavel Emelyanov78c2e502007-10-18 05:18:56 -0700213 } else {
214 /*
215 * we dropper the ip6_fl_lock, so this entry could reappear
216 * and we need to recheck with it.
217 *
218 * OTOH no need to search the active socket first, like it is
219 * done in ipv6_flowlabel_opt - sock is locked, so new entry
220 * with the same label can only appear on another sock
221 */
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700222 lfl = __fl_lookup(net, fl->label);
Pavel Emelyanov78c2e502007-10-18 05:18:56 -0700223 if (lfl != NULL) {
224 atomic_inc(&lfl->users);
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000225 spin_unlock_bh(&ip6_fl_lock);
Pavel Emelyanov78c2e502007-10-18 05:18:56 -0700226 return lfl;
227 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 }
229
230 fl->lastuse = jiffies;
231 fl->next = fl_ht[FL_HASH(fl->label)];
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000232 rcu_assign_pointer(fl_ht[FL_HASH(fl->label)], fl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 atomic_inc(&fl_size);
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000234 spin_unlock_bh(&ip6_fl_lock);
Pavel Emelyanov78c2e502007-10-18 05:18:56 -0700235 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236}
237
238
239
240/* Socket flowlabel lists */
241
Ian Morris67ba4152014-08-24 21:53:10 +0100242struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243{
244 struct ipv6_fl_socklist *sfl;
245 struct ipv6_pinfo *np = inet6_sk(sk);
246
247 label &= IPV6_FLOWLABEL_MASK;
248
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000249 rcu_read_lock_bh();
250 for_each_sk_fl_rcu(np, sfl) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 struct ip6_flowlabel *fl = sfl->fl;
252 if (fl->label == label) {
253 fl->lastuse = jiffies;
254 atomic_inc(&fl->users);
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000255 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 return fl;
257 }
258 }
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000259 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 return NULL;
261}
Arnaldo Carvalho de Melo3cf3dc62005-12-13 23:23:20 -0800262EXPORT_SYMBOL_GPL(fl6_sock_lookup);
263
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264void fl6_free_socklist(struct sock *sk)
265{
266 struct ipv6_pinfo *np = inet6_sk(sk);
267 struct ipv6_fl_socklist *sfl;
268
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000269 if (!rcu_access_pointer(np->ipv6_fl_list))
YOSHIFUJI Hideaki / 吉藤英明f256dc52013-01-30 09:26:42 +0000270 return;
271
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000272 spin_lock_bh(&ip6_sk_fl_lock);
273 while ((sfl = rcu_dereference_protected(np->ipv6_fl_list,
274 lockdep_is_held(&ip6_sk_fl_lock))) != NULL) {
275 np->ipv6_fl_list = sfl->next;
276 spin_unlock_bh(&ip6_sk_fl_lock);
YOSHIFUJI Hideaki / 吉藤英明f256dc52013-01-30 09:26:42 +0000277
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 fl_release(sfl->fl);
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000279 kfree_rcu(sfl, rcu);
280
281 spin_lock_bh(&ip6_sk_fl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 }
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000283 spin_unlock_bh(&ip6_sk_fl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284}
285
286/* Service routines */
287
288
289/*
290 It is the only difficult place. flowlabel enforces equal headers
291 before and including routing header, however user may supply options
292 following rthdr.
293 */
294
Ian Morris67ba4152014-08-24 21:53:10 +0100295struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space,
296 struct ip6_flowlabel *fl,
297 struct ipv6_txoptions *fopt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298{
Ian Morris67ba4152014-08-24 21:53:10 +0100299 struct ipv6_txoptions *fl_opt = fl->opt;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900300
YOSHIFUJI Hideakidf9890c2005-11-20 12:23:18 +0900301 if (fopt == NULL || fopt->opt_flen == 0)
302 return fl_opt;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900303
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 if (fl_opt != NULL) {
305 opt_space->hopopt = fl_opt->hopopt;
YOSHIFUJI Hideakidf9890c2005-11-20 12:23:18 +0900306 opt_space->dst0opt = fl_opt->dst0opt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 opt_space->srcrt = fl_opt->srcrt;
308 opt_space->opt_nflen = fl_opt->opt_nflen;
309 } else {
310 if (fopt->opt_nflen == 0)
311 return fopt;
312 opt_space->hopopt = NULL;
313 opt_space->dst0opt = NULL;
314 opt_space->srcrt = NULL;
315 opt_space->opt_nflen = 0;
316 }
317 opt_space->dst1opt = fopt->dst1opt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 opt_space->opt_flen = fopt->opt_flen;
319 return opt_space;
320}
Chris Elstona495f832012-04-29 21:48:53 +0000321EXPORT_SYMBOL_GPL(fl6_merge_options);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322
323static unsigned long check_linger(unsigned long ttl)
324{
325 if (ttl < FL_MIN_LINGER)
326 return FL_MIN_LINGER*HZ;
327 if (ttl > FL_MAX_LINGER && !capable(CAP_NET_ADMIN))
328 return 0;
329 return ttl*HZ;
330}
331
332static int fl6_renew(struct ip6_flowlabel *fl, unsigned long linger, unsigned long expires)
333{
334 linger = check_linger(linger);
335 if (!linger)
336 return -EPERM;
337 expires = check_linger(expires);
338 if (!expires)
339 return -EPERM;
Florent Fourcot394055f2013-11-07 17:53:14 +0100340
341 spin_lock_bh(&ip6_fl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 fl->lastuse = jiffies;
343 if (time_before(fl->linger, linger))
344 fl->linger = linger;
345 if (time_before(expires, fl->linger))
346 expires = fl->linger;
347 if (time_before(fl->expires, fl->lastuse + expires))
348 fl->expires = fl->lastuse + expires;
Florent Fourcot394055f2013-11-07 17:53:14 +0100349 spin_unlock_bh(&ip6_fl_lock);
350
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 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;
Ian Morris67ba4152014-08-24 21:53:10 +0100390 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
Hannes Frederic Sowaf8c31c82013-11-08 19:26:21 +0100452 rcu_read_lock_bh();
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000453 for_each_sk_fl_rcu(np, sfl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 count++;
Hannes Frederic Sowaf8c31c82013-11-08 19:26:21 +0100455 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456
457 if (room <= 0 ||
458 ((count >= FL_MAX_PER_SOCK ||
Joe Perches35700212009-11-24 14:52:52 -0800459 (count > 0 && room < FL_MAX_SIZE/2) || room < FL_MAX_SIZE/4) &&
460 !capable(CAP_NET_ADMIN)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 return -ENOBUFS;
462
463 return 0;
464}
465
Pavel Emelyanov04028042007-10-18 05:14:58 -0700466static inline void fl_link(struct ipv6_pinfo *np, struct ipv6_fl_socklist *sfl,
467 struct ip6_flowlabel *fl)
468{
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000469 spin_lock_bh(&ip6_sk_fl_lock);
Pavel Emelyanov04028042007-10-18 05:14:58 -0700470 sfl->fl = fl;
471 sfl->next = np->ipv6_fl_list;
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000472 rcu_assign_pointer(np->ipv6_fl_list, sfl);
473 spin_unlock_bh(&ip6_sk_fl_lock);
Pavel Emelyanov04028042007-10-18 05:14:58 -0700474}
475
Florent Fourcot46e5f402014-01-17 17:15:04 +0100476int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
477 int flags)
Florent Fourcot3fdfa5f2013-11-07 17:53:12 +0100478{
479 struct ipv6_pinfo *np = inet6_sk(sk);
480 struct ipv6_fl_socklist *sfl;
481
Florent Fourcot46e5f402014-01-17 17:15:04 +0100482 if (flags & IPV6_FL_F_REMOTE) {
483 freq->flr_label = np->rcv_flowinfo & IPV6_FLOWLABEL_MASK;
484 return 0;
485 }
486
Florent Fourcotdf3687f2014-01-17 17:15:03 +0100487 if (np->repflow) {
488 freq->flr_label = np->flow_label;
489 return 0;
490 }
491
Florent Fourcot3fdfa5f2013-11-07 17:53:12 +0100492 rcu_read_lock_bh();
493
494 for_each_sk_fl_rcu(np, sfl) {
495 if (sfl->fl->label == (np->flow_label & IPV6_FLOWLABEL_MASK)) {
496 spin_lock_bh(&ip6_fl_lock);
497 freq->flr_label = sfl->fl->label;
498 freq->flr_dst = sfl->fl->dst;
499 freq->flr_share = sfl->fl->share;
500 freq->flr_expires = (sfl->fl->expires - jiffies) / HZ;
501 freq->flr_linger = sfl->fl->linger / HZ;
502
503 spin_unlock_bh(&ip6_fl_lock);
504 rcu_read_unlock_bh();
505 return 0;
506 }
507 }
508 rcu_read_unlock_bh();
509
510 return -ENOENT;
511}
512
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen)
514{
Ingo Molnar55205d42008-11-25 16:50:30 -0800515 int uninitialized_var(err);
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700516 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 struct ipv6_pinfo *np = inet6_sk(sk);
518 struct in6_flowlabel_req freq;
Ian Morris67ba4152014-08-24 21:53:10 +0100519 struct ipv6_fl_socklist *sfl1 = NULL;
Eric Dumazet7f0e44a2013-03-07 04:20:32 +0000520 struct ipv6_fl_socklist *sfl;
521 struct ipv6_fl_socklist __rcu **sflp;
Pavel Emelyanov78c2e502007-10-18 05:18:56 -0700522 struct ip6_flowlabel *fl, *fl1 = NULL;
523
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524
525 if (optlen < sizeof(freq))
526 return -EINVAL;
527
528 if (copy_from_user(&freq, optval, sizeof(freq)))
529 return -EFAULT;
530
531 switch (freq.flr_action) {
532 case IPV6_FL_A_PUT:
Florent Fourcotdf3687f2014-01-17 17:15:03 +0100533 if (freq.flr_flags & IPV6_FL_F_REFLECT) {
534 if (sk->sk_protocol != IPPROTO_TCP)
535 return -ENOPROTOOPT;
536 if (!np->repflow)
537 return -ESRCH;
538 np->flow_label = 0;
539 np->repflow = 0;
540 return 0;
541 }
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000542 spin_lock_bh(&ip6_sk_fl_lock);
543 for (sflp = &np->ipv6_fl_list;
Ian Morris67ba4152014-08-24 21:53:10 +0100544 (sfl = rcu_dereference(*sflp)) != NULL;
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000545 sflp = &sfl->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 if (sfl->fl->label == freq.flr_label) {
547 if (freq.flr_label == (np->flow_label&IPV6_FLOWLABEL_MASK))
548 np->flow_label &= ~IPV6_FLOWLABEL_MASK;
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000549 *sflp = rcu_dereference(sfl->next);
550 spin_unlock_bh(&ip6_sk_fl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 fl_release(sfl->fl);
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000552 kfree_rcu(sfl, rcu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 return 0;
554 }
555 }
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000556 spin_unlock_bh(&ip6_sk_fl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 return -ESRCH;
558
559 case IPV6_FL_A_RENEW:
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000560 rcu_read_lock_bh();
561 for_each_sk_fl_rcu(np, sfl) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562 if (sfl->fl->label == freq.flr_label) {
563 err = fl6_renew(sfl->fl, freq.flr_linger, freq.flr_expires);
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000564 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 return err;
566 }
567 }
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000568 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569
Eric W. Biedermanaf31f412012-11-16 03:03:06 +0000570 if (freq.flr_share == IPV6_FL_S_NONE &&
571 ns_capable(net->user_ns, CAP_NET_ADMIN)) {
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700572 fl = fl_lookup(net, freq.flr_label);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 if (fl) {
574 err = fl6_renew(fl, freq.flr_linger, freq.flr_expires);
575 fl_release(fl);
576 return err;
577 }
578 }
579 return -ESRCH;
580
581 case IPV6_FL_A_GET:
Florent Fourcotdf3687f2014-01-17 17:15:03 +0100582 if (freq.flr_flags & IPV6_FL_F_REFLECT) {
Florent Fourcot6444f722014-01-17 17:15:05 +0100583 struct net *net = sock_net(sk);
584 if (net->ipv6.sysctl.flowlabel_consistency) {
585 net_info_ratelimited("Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable\n");
586 return -EPERM;
587 }
588
Florent Fourcotdf3687f2014-01-17 17:15:03 +0100589 if (sk->sk_protocol != IPPROTO_TCP)
590 return -ENOPROTOOPT;
Florent Fourcot6444f722014-01-17 17:15:05 +0100591
Florent Fourcotdf3687f2014-01-17 17:15:03 +0100592 np->repflow = 1;
593 return 0;
594 }
595
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596 if (freq.flr_label & ~IPV6_FLOWLABEL_MASK)
597 return -EINVAL;
598
Maciej Żenczykowskiec0506d2011-08-28 12:35:31 +0000599 fl = fl_create(net, sk, &freq, optval, optlen, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 if (fl == NULL)
601 return err;
602 sfl1 = kmalloc(sizeof(*sfl1), GFP_KERNEL);
603
604 if (freq.flr_label) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 err = -EEXIST;
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000606 rcu_read_lock_bh();
607 for_each_sk_fl_rcu(np, sfl) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608 if (sfl->fl->label == freq.flr_label) {
609 if (freq.flr_flags&IPV6_FL_F_EXCL) {
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000610 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611 goto done;
612 }
613 fl1 = sfl->fl;
Yan Zheng4ea6a802005-10-24 19:55:23 +0800614 atomic_inc(&fl1->users);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615 break;
616 }
617 }
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000618 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619
620 if (fl1 == NULL)
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700621 fl1 = fl_lookup(net, freq.flr_label);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622 if (fl1) {
Pavel Emelyanov78c2e502007-10-18 05:18:56 -0700623recheck:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 err = -EEXIST;
625 if (freq.flr_flags&IPV6_FL_F_EXCL)
626 goto release;
627 err = -EPERM;
628 if (fl1->share == IPV6_FL_S_EXCL ||
629 fl1->share != fl->share ||
Eric W. Biederman4f82f452012-05-24 10:37:59 -0600630 ((fl1->share == IPV6_FL_S_PROCESS) &&
631 (fl1->owner.pid == fl->owner.pid)) ||
632 ((fl1->share == IPV6_FL_S_USER) &&
633 uid_eq(fl1->owner.uid, fl->owner.uid)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634 goto release;
635
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636 err = -ENOMEM;
637 if (sfl1 == NULL)
638 goto release;
639 if (fl->linger > fl1->linger)
640 fl1->linger = fl->linger;
641 if ((long)(fl->expires - fl1->expires) > 0)
642 fl1->expires = fl->expires;
Pavel Emelyanov04028042007-10-18 05:14:58 -0700643 fl_link(np, sfl1, fl1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 fl_free(fl);
645 return 0;
646
647release:
648 fl_release(fl1);
649 goto done;
650 }
651 }
652 err = -ENOENT;
653 if (!(freq.flr_flags&IPV6_FL_F_CREATE))
654 goto done;
655
656 err = -ENOMEM;
657 if (sfl1 == NULL || (err = mem_check(sk)) != 0)
658 goto done;
659
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700660 fl1 = fl_intern(net, fl, freq.flr_label);
Pavel Emelyanov78c2e502007-10-18 05:18:56 -0700661 if (fl1 != NULL)
662 goto recheck;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663
David S. Miller6c94d362005-05-29 20:28:01 -0700664 if (!freq.flr_label) {
665 if (copy_to_user(&((struct in6_flowlabel_req __user *) optval)->flr_label,
666 &fl->label, sizeof(fl->label))) {
667 /* Intentionally ignore fault. */
668 }
669 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670
Pavel Emelyanov04028042007-10-18 05:14:58 -0700671 fl_link(np, sfl1, fl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672 return 0;
673
674 default:
675 return -EINVAL;
676 }
677
678done:
679 fl_free(fl);
680 kfree(sfl1);
681 return err;
682}
683
684#ifdef CONFIG_PROC_FS
685
686struct ip6fl_iter_state {
Benjamin Thery5983a3d2008-03-26 16:53:30 -0700687 struct seq_net_private p;
Eric W. Biederman4f82f452012-05-24 10:37:59 -0600688 struct pid_namespace *pid_ns;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689 int bucket;
690};
691
692#define ip6fl_seq_private(seq) ((struct ip6fl_iter_state *)(seq)->private)
693
694static struct ip6_flowlabel *ip6fl_get_first(struct seq_file *seq)
695{
696 struct ip6_flowlabel *fl = NULL;
697 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
Benjamin Thery5983a3d2008-03-26 16:53:30 -0700698 struct net *net = seq_file_net(seq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699
700 for (state->bucket = 0; state->bucket <= FL_HASH_MASK; ++state->bucket) {
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000701 for_each_fl_rcu(state->bucket, fl) {
702 if (net_eq(fl->fl_net, net))
703 goto out;
704 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705 }
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000706 fl = NULL;
707out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708 return fl;
709}
710
711static struct ip6_flowlabel *ip6fl_get_next(struct seq_file *seq, struct ip6_flowlabel *fl)
712{
713 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
Benjamin Thery5983a3d2008-03-26 16:53:30 -0700714 struct net *net = seq_file_net(seq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000716 for_each_fl_continue_rcu(fl) {
717 if (net_eq(fl->fl_net, net))
718 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719 }
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000720
721try_again:
722 if (++state->bucket <= FL_HASH_MASK) {
723 for_each_fl_rcu(state->bucket, fl) {
724 if (net_eq(fl->fl_net, net))
725 goto out;
726 }
727 goto try_again;
728 }
729 fl = NULL;
730
731out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732 return fl;
733}
734
735static struct ip6_flowlabel *ip6fl_get_idx(struct seq_file *seq, loff_t pos)
736{
737 struct ip6_flowlabel *fl = ip6fl_get_first(seq);
738 if (fl)
739 while (pos && (fl = ip6fl_get_next(seq, fl)) != NULL)
740 --pos;
741 return pos ? NULL : fl;
742}
743
744static void *ip6fl_seq_start(struct seq_file *seq, loff_t *pos)
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000745 __acquires(RCU)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746{
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000747 rcu_read_lock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748 return *pos ? ip6fl_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
749}
750
751static void *ip6fl_seq_next(struct seq_file *seq, void *v, loff_t *pos)
752{
753 struct ip6_flowlabel *fl;
754
755 if (v == SEQ_START_TOKEN)
756 fl = ip6fl_get_first(seq);
757 else
758 fl = ip6fl_get_next(seq, v);
759 ++*pos;
760 return fl;
761}
762
763static void ip6fl_seq_stop(struct seq_file *seq, void *v)
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000764 __releases(RCU)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765{
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000766 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767}
768
James Morris1b7c2db2006-10-31 00:43:44 -0800769static int ip6fl_seq_show(struct seq_file *seq, void *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770{
Eric W. Biederman4f82f452012-05-24 10:37:59 -0600771 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
James Morris1b7c2db2006-10-31 00:43:44 -0800772 if (v == SEQ_START_TOKEN)
773 seq_printf(seq, "%-5s %-1s %-6s %-6s %-6s %-8s %-32s %s\n",
774 "Label", "S", "Owner", "Users", "Linger", "Expires", "Dst", "Opt");
775 else {
776 struct ip6_flowlabel *fl = v;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777 seq_printf(seq,
Harvey Harrison4b7a4272008-10-29 12:50:24 -0700778 "%05X %-1d %-6d %-6d %-6ld %-8ld %pi6 %-4d\n",
Eric Dumazet95c96172012-04-15 05:58:06 +0000779 (unsigned int)ntohl(fl->label),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780 fl->share,
Eric W. Biederman4f82f452012-05-24 10:37:59 -0600781 ((fl->share == IPV6_FL_S_PROCESS) ?
782 pid_nr_ns(fl->owner.pid, state->pid_ns) :
783 ((fl->share == IPV6_FL_S_USER) ?
784 from_kuid_munged(seq_user_ns(seq), fl->owner.uid) :
785 0)),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 atomic_read(&fl->users),
787 fl->linger/HZ,
788 (long)(fl->expires - jiffies)/HZ,
Harvey Harrisonb0711952008-10-28 16:05:40 -0700789 &fl->dst,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790 fl->opt ? fl->opt->opt_nflen : 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792 return 0;
793}
794
Philippe De Muyter56b3d972007-07-10 23:07:31 -0700795static const struct seq_operations ip6fl_seq_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796 .start = ip6fl_seq_start,
797 .next = ip6fl_seq_next,
798 .stop = ip6fl_seq_stop,
799 .show = ip6fl_seq_show,
800};
801
802static int ip6fl_seq_open(struct inode *inode, struct file *file)
803{
Eric W. Biederman4f82f452012-05-24 10:37:59 -0600804 struct seq_file *seq;
805 struct ip6fl_iter_state *state;
806 int err;
807
808 err = seq_open_net(inode, file, &ip6fl_seq_ops,
809 sizeof(struct ip6fl_iter_state));
810
811 if (!err) {
812 seq = file->private_data;
813 state = ip6fl_seq_private(seq);
814 rcu_read_lock();
815 state->pid_ns = get_pid_ns(task_active_pid_ns(current));
816 rcu_read_unlock();
817 }
818 return err;
819}
820
821static int ip6fl_seq_release(struct inode *inode, struct file *file)
822{
823 struct seq_file *seq = file->private_data;
824 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
825 put_pid_ns(state->pid_ns);
826 return seq_release_net(inode, file);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827}
828
Arjan van de Ven9a321442007-02-12 00:55:35 -0800829static const struct file_operations ip6fl_seq_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830 .owner = THIS_MODULE,
831 .open = ip6fl_seq_open,
832 .read = seq_read,
833 .llseek = seq_lseek,
Eric W. Biederman4f82f452012-05-24 10:37:59 -0600834 .release = ip6fl_seq_release,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000837static int __net_init ip6_flowlabel_proc_init(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838{
Gao fengd4beaa62013-02-18 01:34:54 +0000839 if (!proc_create("ip6_flowlabel", S_IRUGO, net->proc_net,
840 &ip6fl_seq_fops))
Daniel Lezcano0a3e78a2007-12-11 02:23:18 -0800841 return -ENOMEM;
842 return 0;
843}
844
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000845static void __net_exit ip6_flowlabel_proc_fini(struct net *net)
Daniel Lezcano0a3e78a2007-12-11 02:23:18 -0800846{
Gao fengece31ff2013-02-18 01:34:56 +0000847 remove_proc_entry("ip6_flowlabel", net->proc_net);
Daniel Lezcano0a3e78a2007-12-11 02:23:18 -0800848}
849#else
850static inline int ip6_flowlabel_proc_init(struct net *net)
851{
852 return 0;
853}
854static inline void ip6_flowlabel_proc_fini(struct net *net)
855{
Daniel Lezcano0a3e78a2007-12-11 02:23:18 -0800856}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857#endif
Daniel Lezcano0a3e78a2007-12-11 02:23:18 -0800858
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000859static void __net_exit ip6_flowlabel_net_exit(struct net *net)
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700860{
861 ip6_fl_purge(net);
Benjamin Thery5983a3d2008-03-26 16:53:30 -0700862 ip6_flowlabel_proc_fini(net);
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700863}
864
865static struct pernet_operations ip6_flowlabel_net_ops = {
Benjamin Thery5983a3d2008-03-26 16:53:30 -0700866 .init = ip6_flowlabel_proc_init,
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700867 .exit = ip6_flowlabel_net_exit,
868};
869
Daniel Lezcano0a3e78a2007-12-11 02:23:18 -0800870int ip6_flowlabel_init(void)
871{
Benjamin Thery5983a3d2008-03-26 16:53:30 -0700872 return register_pernet_subsys(&ip6_flowlabel_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873}
874
875void ip6_flowlabel_cleanup(void)
876{
877 del_timer(&ip6_fl_gc_timer);
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700878 unregister_pernet_subsys(&ip6_flowlabel_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879}