blob: 1f9ebe3cbb4ac042edd0b05754d1fc03cdfe73cd [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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 kfree(fl->opt);
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000104 kfree_rcu(fl, rcu);
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700105 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106}
107
108static void fl_release(struct ip6_flowlabel *fl)
109{
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000110 spin_lock_bh(&ip6_fl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111
112 fl->lastuse = jiffies;
113 if (atomic_dec_and_test(&fl->users)) {
114 unsigned long ttd = fl->lastuse + fl->linger;
115 if (time_after(ttd, fl->expires))
116 fl->expires = ttd;
117 ttd = fl->expires;
118 if (fl->opt && fl->share == IPV6_FL_S_EXCL) {
119 struct ipv6_txoptions *opt = fl->opt;
120 fl->opt = NULL;
121 kfree(opt);
122 }
123 if (!timer_pending(&ip6_fl_gc_timer) ||
124 time_after(ip6_fl_gc_timer.expires, ttd))
125 mod_timer(&ip6_fl_gc_timer, ttd);
126 }
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000127 spin_unlock_bh(&ip6_fl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128}
129
130static void ip6_fl_gc(unsigned long dummy)
131{
132 int i;
133 unsigned long now = jiffies;
134 unsigned long sched = 0;
135
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000136 spin_lock(&ip6_fl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137
Ian Morris67ba4152014-08-24 21:53:10 +0100138 for (i = 0; i <= FL_HASH_MASK; i++) {
Eric Dumazet7f0e44a2013-03-07 04:20:32 +0000139 struct ip6_flowlabel *fl;
140 struct ip6_flowlabel __rcu **flp;
141
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 flp = &fl_ht[i];
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000143 while ((fl = rcu_dereference_protected(*flp,
144 lockdep_is_held(&ip6_fl_lock))) != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 if (atomic_read(&fl->users) == 0) {
146 unsigned long ttd = fl->lastuse + fl->linger;
147 if (time_after(ttd, fl->expires))
148 fl->expires = ttd;
149 ttd = fl->expires;
150 if (time_after_eq(now, ttd)) {
151 *flp = fl->next;
152 fl_free(fl);
153 atomic_dec(&fl_size);
154 continue;
155 }
156 if (!sched || time_before(ttd, sched))
157 sched = ttd;
158 }
159 flp = &fl->next;
160 }
161 }
162 if (!sched && atomic_read(&fl_size))
163 sched = now + FL_MAX_LINGER;
164 if (sched) {
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700165 mod_timer(&ip6_fl_gc_timer, sched);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 }
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000167 spin_unlock(&ip6_fl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168}
169
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000170static void __net_exit ip6_fl_purge(struct net *net)
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700171{
172 int i;
173
Jan Stancek4762fb92015-02-11 14:06:23 +0100174 spin_lock_bh(&ip6_fl_lock);
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700175 for (i = 0; i <= FL_HASH_MASK; i++) {
Eric Dumazet7f0e44a2013-03-07 04:20:32 +0000176 struct ip6_flowlabel *fl;
177 struct ip6_flowlabel __rcu **flp;
178
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700179 flp = &fl_ht[i];
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000180 while ((fl = rcu_dereference_protected(*flp,
181 lockdep_is_held(&ip6_fl_lock))) != NULL) {
Octavian Purdila09ad9bc2009-11-25 15:14:13 -0800182 if (net_eq(fl->fl_net, net) &&
183 atomic_read(&fl->users) == 0) {
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700184 *flp = fl->next;
185 fl_free(fl);
186 atomic_dec(&fl_size);
187 continue;
188 }
189 flp = &fl->next;
190 }
191 }
Jan Stancek4762fb92015-02-11 14:06:23 +0100192 spin_unlock_bh(&ip6_fl_lock);
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700193}
194
195static struct ip6_flowlabel *fl_intern(struct net *net,
196 struct ip6_flowlabel *fl, __be32 label)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197{
Pavel Emelyanov78c2e502007-10-18 05:18:56 -0700198 struct ip6_flowlabel *lfl;
199
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 fl->label = label & IPV6_FLOWLABEL_MASK;
201
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000202 spin_lock_bh(&ip6_fl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 if (label == 0) {
204 for (;;) {
Aruna-Hewapathirane63862b52014-01-11 07:15:59 -0500205 fl->label = htonl(prandom_u32())&IPV6_FLOWLABEL_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 if (fl->label) {
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700207 lfl = __fl_lookup(net, fl->label);
Ian Morris63159f22015-03-29 14:00:04 +0100208 if (!lfl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 break;
210 }
211 }
Pavel Emelyanov78c2e502007-10-18 05:18:56 -0700212 } else {
213 /*
214 * we dropper the ip6_fl_lock, so this entry could reappear
215 * and we need to recheck with it.
216 *
217 * OTOH no need to search the active socket first, like it is
218 * done in ipv6_flowlabel_opt - sock is locked, so new entry
219 * with the same label can only appear on another sock
220 */
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700221 lfl = __fl_lookup(net, fl->label);
Ian Morris53b24b82015-03-29 14:00:05 +0100222 if (lfl) {
Pavel Emelyanov78c2e502007-10-18 05:18:56 -0700223 atomic_inc(&lfl->users);
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000224 spin_unlock_bh(&ip6_fl_lock);
Pavel Emelyanov78c2e502007-10-18 05:18:56 -0700225 return lfl;
226 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 }
228
229 fl->lastuse = jiffies;
230 fl->next = fl_ht[FL_HASH(fl->label)];
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000231 rcu_assign_pointer(fl_ht[FL_HASH(fl->label)], fl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 atomic_inc(&fl_size);
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000233 spin_unlock_bh(&ip6_fl_lock);
Pavel Emelyanov78c2e502007-10-18 05:18:56 -0700234 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235}
236
237
238
239/* Socket flowlabel lists */
240
Ian Morris67ba4152014-08-24 21:53:10 +0100241struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242{
243 struct ipv6_fl_socklist *sfl;
244 struct ipv6_pinfo *np = inet6_sk(sk);
245
246 label &= IPV6_FLOWLABEL_MASK;
247
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000248 rcu_read_lock_bh();
249 for_each_sk_fl_rcu(np, sfl) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 struct ip6_flowlabel *fl = sfl->fl;
251 if (fl->label == label) {
252 fl->lastuse = jiffies;
253 atomic_inc(&fl->users);
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000254 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 return fl;
256 }
257 }
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 NULL;
260}
Arnaldo Carvalho de Melo3cf3dc62005-12-13 23:23:20 -0800261EXPORT_SYMBOL_GPL(fl6_sock_lookup);
262
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263void fl6_free_socklist(struct sock *sk)
264{
265 struct ipv6_pinfo *np = inet6_sk(sk);
266 struct ipv6_fl_socklist *sfl;
267
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000268 if (!rcu_access_pointer(np->ipv6_fl_list))
YOSHIFUJI Hideaki / 吉藤英明f256dc52013-01-30 09:26:42 +0000269 return;
270
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000271 spin_lock_bh(&ip6_sk_fl_lock);
272 while ((sfl = rcu_dereference_protected(np->ipv6_fl_list,
273 lockdep_is_held(&ip6_sk_fl_lock))) != NULL) {
274 np->ipv6_fl_list = sfl->next;
275 spin_unlock_bh(&ip6_sk_fl_lock);
YOSHIFUJI Hideaki / 吉藤英明f256dc52013-01-30 09:26:42 +0000276
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 fl_release(sfl->fl);
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000278 kfree_rcu(sfl, rcu);
279
280 spin_lock_bh(&ip6_sk_fl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 }
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000282 spin_unlock_bh(&ip6_sk_fl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283}
284
285/* Service routines */
286
287
288/*
289 It is the only difficult place. flowlabel enforces equal headers
290 before and including routing header, however user may supply options
291 following rthdr.
292 */
293
Ian Morris67ba4152014-08-24 21:53:10 +0100294struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space,
295 struct ip6_flowlabel *fl,
296 struct ipv6_txoptions *fopt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297{
Ian Morris67ba4152014-08-24 21:53:10 +0100298 struct ipv6_txoptions *fl_opt = fl->opt;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900299
Ian Morris63159f22015-03-29 14:00:04 +0100300 if (!fopt || fopt->opt_flen == 0)
YOSHIFUJI Hideakidf9890c2005-11-20 12:23:18 +0900301 return fl_opt;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900302
Ian Morris53b24b82015-03-29 14:00:05 +0100303 if (fl_opt) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 opt_space->hopopt = fl_opt->hopopt;
YOSHIFUJI Hideakidf9890c2005-11-20 12:23:18 +0900305 opt_space->dst0opt = fl_opt->dst0opt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 opt_space->srcrt = fl_opt->srcrt;
307 opt_space->opt_nflen = fl_opt->opt_nflen;
308 } else {
309 if (fopt->opt_nflen == 0)
310 return fopt;
311 opt_space->hopopt = NULL;
312 opt_space->dst0opt = NULL;
313 opt_space->srcrt = NULL;
314 opt_space->opt_nflen = 0;
315 }
316 opt_space->dst1opt = fopt->dst1opt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 opt_space->opt_flen = fopt->opt_flen;
318 return opt_space;
319}
Chris Elstona495f832012-04-29 21:48:53 +0000320EXPORT_SYMBOL_GPL(fl6_merge_options);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321
322static unsigned long check_linger(unsigned long ttl)
323{
324 if (ttl < FL_MIN_LINGER)
325 return FL_MIN_LINGER*HZ;
326 if (ttl > FL_MAX_LINGER && !capable(CAP_NET_ADMIN))
327 return 0;
328 return ttl*HZ;
329}
330
331static int fl6_renew(struct ip6_flowlabel *fl, unsigned long linger, unsigned long expires)
332{
333 linger = check_linger(linger);
334 if (!linger)
335 return -EPERM;
336 expires = check_linger(expires);
337 if (!expires)
338 return -EPERM;
Florent Fourcot394055f2013-11-07 17:53:14 +0100339
340 spin_lock_bh(&ip6_fl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 fl->lastuse = jiffies;
342 if (time_before(fl->linger, linger))
343 fl->linger = linger;
344 if (time_before(expires, fl->linger))
345 expires = fl->linger;
346 if (time_before(fl->expires, fl->lastuse + expires))
347 fl->expires = fl->lastuse + expires;
Florent Fourcot394055f2013-11-07 17:53:14 +0100348 spin_unlock_bh(&ip6_fl_lock);
349
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 return 0;
351}
352
353static struct ip6_flowlabel *
Maciej Żenczykowskiec0506d2011-08-28 12:35:31 +0000354fl_create(struct net *net, struct sock *sk, struct in6_flowlabel_req *freq,
355 char __user *optval, int optlen, int *err_p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356{
David S. Miller684de402009-02-06 00:49:55 -0800357 struct ip6_flowlabel *fl = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 int olen;
359 int addr_type;
360 int err;
361
David S. Miller684de402009-02-06 00:49:55 -0800362 olen = optlen - CMSG_ALIGN(sizeof(*freq));
363 err = -EINVAL;
364 if (olen > 64 * 1024)
365 goto done;
366
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367 err = -ENOMEM;
Ingo Oeser0c600ed2006-03-20 23:01:32 -0800368 fl = kzalloc(sizeof(*fl), GFP_KERNEL);
Ian Morris63159f22015-03-29 14:00:04 +0100369 if (!fl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 if (olen > 0) {
373 struct msghdr msg;
David S. Miller4c9483b2011-03-12 16:22:43 -0500374 struct flowi6 flowi6;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 int junk;
376
377 err = -ENOMEM;
378 fl->opt = kmalloc(sizeof(*fl->opt) + olen, GFP_KERNEL);
Ian Morris63159f22015-03-29 14:00:04 +0100379 if (!fl->opt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 goto done;
381
382 memset(fl->opt, 0, sizeof(*fl->opt));
383 fl->opt->tot_len = sizeof(*fl->opt) + olen;
384 err = -EFAULT;
385 if (copy_from_user(fl->opt+1, optval+CMSG_ALIGN(sizeof(*freq)), olen))
386 goto done;
387
388 msg.msg_controllen = olen;
Ian Morris67ba4152014-08-24 21:53:10 +0100389 msg.msg_control = (void *)(fl->opt+1);
David S. Miller4c9483b2011-03-12 16:22:43 -0500390 memset(&flowi6, 0, sizeof(flowi6));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391
Tom Parkin73df66f2013-01-31 01:02:24 +0000392 err = ip6_datagram_send_ctl(net, sk, &msg, &flowi6, fl->opt,
393 &junk, &junk, &junk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 if (err)
395 goto done;
396 err = -EINVAL;
397 if (fl->opt->opt_flen)
398 goto done;
399 if (fl->opt->opt_nflen == 0) {
400 kfree(fl->opt);
401 fl->opt = NULL;
402 }
403 }
404
Eric W. Biedermanefd7ef12015-03-11 23:04:08 -0500405 fl->fl_net = net;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 fl->expires = jiffies;
407 err = fl6_renew(fl, freq->flr_linger, freq->flr_expires);
408 if (err)
409 goto done;
410 fl->share = freq->flr_share;
411 addr_type = ipv6_addr_type(&freq->flr_dst);
Joe Perches35700212009-11-24 14:52:52 -0800412 if ((addr_type & IPV6_ADDR_MAPPED) ||
413 addr_type == IPV6_ADDR_ANY) {
James Morrisc6817e42006-10-30 18:56:06 -0800414 err = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 goto done;
James Morrisc6817e42006-10-30 18:56:06 -0800416 }
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000417 fl->dst = freq->flr_dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 atomic_set(&fl->users, 1);
419 switch (fl->share) {
420 case IPV6_FL_S_EXCL:
421 case IPV6_FL_S_ANY:
422 break;
423 case IPV6_FL_S_PROCESS:
Eric W. Biederman4f82f452012-05-24 10:37:59 -0600424 fl->owner.pid = get_task_pid(current, PIDTYPE_PID);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 break;
426 case IPV6_FL_S_USER:
Eric W. Biederman4f82f452012-05-24 10:37:59 -0600427 fl->owner.uid = current_euid();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 break;
429 default:
430 err = -EINVAL;
431 goto done;
432 }
433 return fl;
434
435done:
436 fl_free(fl);
437 *err_p = err;
438 return NULL;
439}
440
441static int mem_check(struct sock *sk)
442{
443 struct ipv6_pinfo *np = inet6_sk(sk);
444 struct ipv6_fl_socklist *sfl;
445 int room = FL_MAX_SIZE - atomic_read(&fl_size);
446 int count = 0;
447
448 if (room > FL_MAX_SIZE - FL_MAX_PER_SOCK)
449 return 0;
450
Hannes Frederic Sowaf8c31c82013-11-08 19:26:21 +0100451 rcu_read_lock_bh();
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++;
Hannes Frederic Sowaf8c31c82013-11-08 19:26:21 +0100454 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455
456 if (room <= 0 ||
457 ((count >= FL_MAX_PER_SOCK ||
Joe Perches35700212009-11-24 14:52:52 -0800458 (count > 0 && room < FL_MAX_SIZE/2) || room < FL_MAX_SIZE/4) &&
459 !capable(CAP_NET_ADMIN)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 return -ENOBUFS;
461
462 return 0;
463}
464
Pavel Emelyanov04028042007-10-18 05:14:58 -0700465static inline void fl_link(struct ipv6_pinfo *np, struct ipv6_fl_socklist *sfl,
466 struct ip6_flowlabel *fl)
467{
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000468 spin_lock_bh(&ip6_sk_fl_lock);
Pavel Emelyanov04028042007-10-18 05:14:58 -0700469 sfl->fl = fl;
470 sfl->next = np->ipv6_fl_list;
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000471 rcu_assign_pointer(np->ipv6_fl_list, sfl);
472 spin_unlock_bh(&ip6_sk_fl_lock);
Pavel Emelyanov04028042007-10-18 05:14:58 -0700473}
474
Florent Fourcot46e5f402014-01-17 17:15:04 +0100475int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
476 int flags)
Florent Fourcot3fdfa5f2013-11-07 17:53:12 +0100477{
478 struct ipv6_pinfo *np = inet6_sk(sk);
479 struct ipv6_fl_socklist *sfl;
480
Florent Fourcot46e5f402014-01-17 17:15:04 +0100481 if (flags & IPV6_FL_F_REMOTE) {
482 freq->flr_label = np->rcv_flowinfo & IPV6_FLOWLABEL_MASK;
483 return 0;
484 }
485
Florent Fourcotdf3687f2014-01-17 17:15:03 +0100486 if (np->repflow) {
487 freq->flr_label = np->flow_label;
488 return 0;
489 }
490
Florent Fourcot3fdfa5f2013-11-07 17:53:12 +0100491 rcu_read_lock_bh();
492
493 for_each_sk_fl_rcu(np, sfl) {
494 if (sfl->fl->label == (np->flow_label & IPV6_FLOWLABEL_MASK)) {
495 spin_lock_bh(&ip6_fl_lock);
496 freq->flr_label = sfl->fl->label;
497 freq->flr_dst = sfl->fl->dst;
498 freq->flr_share = sfl->fl->share;
499 freq->flr_expires = (sfl->fl->expires - jiffies) / HZ;
500 freq->flr_linger = sfl->fl->linger / HZ;
501
502 spin_unlock_bh(&ip6_fl_lock);
503 rcu_read_unlock_bh();
504 return 0;
505 }
506 }
507 rcu_read_unlock_bh();
508
509 return -ENOENT;
510}
511
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen)
513{
Ingo Molnar55205d42008-11-25 16:50:30 -0800514 int uninitialized_var(err);
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700515 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 struct ipv6_pinfo *np = inet6_sk(sk);
517 struct in6_flowlabel_req freq;
Ian Morris67ba4152014-08-24 21:53:10 +0100518 struct ipv6_fl_socklist *sfl1 = NULL;
Eric Dumazet7f0e44a2013-03-07 04:20:32 +0000519 struct ipv6_fl_socklist *sfl;
520 struct ipv6_fl_socklist __rcu **sflp;
Pavel Emelyanov78c2e502007-10-18 05:18:56 -0700521 struct ip6_flowlabel *fl, *fl1 = NULL;
522
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523
524 if (optlen < sizeof(freq))
525 return -EINVAL;
526
527 if (copy_from_user(&freq, optval, sizeof(freq)))
528 return -EFAULT;
529
530 switch (freq.flr_action) {
531 case IPV6_FL_A_PUT:
Florent Fourcotdf3687f2014-01-17 17:15:03 +0100532 if (freq.flr_flags & IPV6_FL_F_REFLECT) {
533 if (sk->sk_protocol != IPPROTO_TCP)
534 return -ENOPROTOOPT;
535 if (!np->repflow)
536 return -ESRCH;
537 np->flow_label = 0;
538 np->repflow = 0;
539 return 0;
540 }
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000541 spin_lock_bh(&ip6_sk_fl_lock);
542 for (sflp = &np->ipv6_fl_list;
Ian Morris67ba4152014-08-24 21:53:10 +0100543 (sfl = rcu_dereference(*sflp)) != NULL;
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000544 sflp = &sfl->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 if (sfl->fl->label == freq.flr_label) {
546 if (freq.flr_label == (np->flow_label&IPV6_FLOWLABEL_MASK))
547 np->flow_label &= ~IPV6_FLOWLABEL_MASK;
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000548 *sflp = rcu_dereference(sfl->next);
549 spin_unlock_bh(&ip6_sk_fl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 fl_release(sfl->fl);
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000551 kfree_rcu(sfl, rcu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 return 0;
553 }
554 }
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000555 spin_unlock_bh(&ip6_sk_fl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556 return -ESRCH;
557
558 case IPV6_FL_A_RENEW:
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000559 rcu_read_lock_bh();
560 for_each_sk_fl_rcu(np, sfl) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 if (sfl->fl->label == freq.flr_label) {
562 err = fl6_renew(sfl->fl, freq.flr_linger, freq.flr_expires);
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000563 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564 return err;
565 }
566 }
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000567 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568
Eric W. Biedermanaf31f412012-11-16 03:03:06 +0000569 if (freq.flr_share == IPV6_FL_S_NONE &&
570 ns_capable(net->user_ns, CAP_NET_ADMIN)) {
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700571 fl = fl_lookup(net, freq.flr_label);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572 if (fl) {
573 err = fl6_renew(fl, freq.flr_linger, freq.flr_expires);
574 fl_release(fl);
575 return err;
576 }
577 }
578 return -ESRCH;
579
580 case IPV6_FL_A_GET:
Florent Fourcotdf3687f2014-01-17 17:15:03 +0100581 if (freq.flr_flags & IPV6_FL_F_REFLECT) {
Florent Fourcot6444f722014-01-17 17:15:05 +0100582 struct net *net = sock_net(sk);
583 if (net->ipv6.sysctl.flowlabel_consistency) {
584 net_info_ratelimited("Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable\n");
585 return -EPERM;
586 }
587
Florent Fourcotdf3687f2014-01-17 17:15:03 +0100588 if (sk->sk_protocol != IPPROTO_TCP)
589 return -ENOPROTOOPT;
Florent Fourcot6444f722014-01-17 17:15:05 +0100590
Florent Fourcotdf3687f2014-01-17 17:15:03 +0100591 np->repflow = 1;
592 return 0;
593 }
594
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595 if (freq.flr_label & ~IPV6_FLOWLABEL_MASK)
596 return -EINVAL;
597
Tom Herbert82a584b2015-04-29 15:33:21 -0700598 if (net->ipv6.sysctl.flowlabel_state_ranges &&
599 (freq.flr_label & IPV6_FLOWLABEL_STATELESS_FLAG))
600 return -ERANGE;
601
Maciej Żenczykowskiec0506d2011-08-28 12:35:31 +0000602 fl = fl_create(net, sk, &freq, optval, optlen, &err);
Ian Morris63159f22015-03-29 14:00:04 +0100603 if (!fl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604 return err;
605 sfl1 = kmalloc(sizeof(*sfl1), GFP_KERNEL);
606
607 if (freq.flr_label) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608 err = -EEXIST;
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000609 rcu_read_lock_bh();
610 for_each_sk_fl_rcu(np, sfl) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611 if (sfl->fl->label == freq.flr_label) {
612 if (freq.flr_flags&IPV6_FL_F_EXCL) {
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000613 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 goto done;
615 }
616 fl1 = sfl->fl;
Yan Zheng4ea6a802005-10-24 19:55:23 +0800617 atomic_inc(&fl1->users);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 break;
619 }
620 }
YOSHIFUJI Hideaki / 吉藤英明18367682013-01-30 09:27:52 +0000621 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622
Ian Morris63159f22015-03-29 14:00:04 +0100623 if (!fl1)
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700624 fl1 = fl_lookup(net, freq.flr_label);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625 if (fl1) {
Pavel Emelyanov78c2e502007-10-18 05:18:56 -0700626recheck:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627 err = -EEXIST;
628 if (freq.flr_flags&IPV6_FL_F_EXCL)
629 goto release;
630 err = -EPERM;
631 if (fl1->share == IPV6_FL_S_EXCL ||
632 fl1->share != fl->share ||
Eric W. Biederman4f82f452012-05-24 10:37:59 -0600633 ((fl1->share == IPV6_FL_S_PROCESS) &&
634 (fl1->owner.pid == fl->owner.pid)) ||
635 ((fl1->share == IPV6_FL_S_USER) &&
636 uid_eq(fl1->owner.uid, fl->owner.uid)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637 goto release;
638
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639 err = -ENOMEM;
Ian Morris63159f22015-03-29 14:00:04 +0100640 if (!sfl1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 goto release;
642 if (fl->linger > fl1->linger)
643 fl1->linger = fl->linger;
644 if ((long)(fl->expires - fl1->expires) > 0)
645 fl1->expires = fl->expires;
Pavel Emelyanov04028042007-10-18 05:14:58 -0700646 fl_link(np, sfl1, fl1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647 fl_free(fl);
648 return 0;
649
650release:
651 fl_release(fl1);
652 goto done;
653 }
654 }
655 err = -ENOENT;
656 if (!(freq.flr_flags&IPV6_FL_F_CREATE))
657 goto done;
658
659 err = -ENOMEM;
Ian Morris63159f22015-03-29 14:00:04 +0100660 if (!sfl1)
Ian Morrise5d08d72014-11-23 21:28:43 +0000661 goto done;
662
663 err = mem_check(sk);
664 if (err != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665 goto done;
666
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700667 fl1 = fl_intern(net, fl, freq.flr_label);
Ian Morris53b24b82015-03-29 14:00:05 +0100668 if (fl1)
Pavel Emelyanov78c2e502007-10-18 05:18:56 -0700669 goto recheck;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670
David S. Miller6c94d362005-05-29 20:28:01 -0700671 if (!freq.flr_label) {
672 if (copy_to_user(&((struct in6_flowlabel_req __user *) optval)->flr_label,
673 &fl->label, sizeof(fl->label))) {
674 /* Intentionally ignore fault. */
675 }
676 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677
Pavel Emelyanov04028042007-10-18 05:14:58 -0700678 fl_link(np, sfl1, fl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679 return 0;
680
681 default:
682 return -EINVAL;
683 }
684
685done:
686 fl_free(fl);
687 kfree(sfl1);
688 return err;
689}
690
691#ifdef CONFIG_PROC_FS
692
693struct ip6fl_iter_state {
Benjamin Thery5983a3d2008-03-26 16:53:30 -0700694 struct seq_net_private p;
Eric W. Biederman4f82f452012-05-24 10:37:59 -0600695 struct pid_namespace *pid_ns;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696 int bucket;
697};
698
699#define ip6fl_seq_private(seq) ((struct ip6fl_iter_state *)(seq)->private)
700
701static struct ip6_flowlabel *ip6fl_get_first(struct seq_file *seq)
702{
703 struct ip6_flowlabel *fl = NULL;
704 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
Benjamin Thery5983a3d2008-03-26 16:53:30 -0700705 struct net *net = seq_file_net(seq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706
707 for (state->bucket = 0; state->bucket <= FL_HASH_MASK; ++state->bucket) {
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000708 for_each_fl_rcu(state->bucket, fl) {
709 if (net_eq(fl->fl_net, net))
710 goto out;
711 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712 }
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000713 fl = NULL;
714out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715 return fl;
716}
717
718static struct ip6_flowlabel *ip6fl_get_next(struct seq_file *seq, struct ip6_flowlabel *fl)
719{
720 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
Benjamin Thery5983a3d2008-03-26 16:53:30 -0700721 struct net *net = seq_file_net(seq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000723 for_each_fl_continue_rcu(fl) {
724 if (net_eq(fl->fl_net, net))
725 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726 }
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000727
728try_again:
729 if (++state->bucket <= FL_HASH_MASK) {
730 for_each_fl_rcu(state->bucket, fl) {
731 if (net_eq(fl->fl_net, net))
732 goto out;
733 }
734 goto try_again;
735 }
736 fl = NULL;
737
738out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739 return fl;
740}
741
742static struct ip6_flowlabel *ip6fl_get_idx(struct seq_file *seq, loff_t pos)
743{
744 struct ip6_flowlabel *fl = ip6fl_get_first(seq);
745 if (fl)
746 while (pos && (fl = ip6fl_get_next(seq, fl)) != NULL)
747 --pos;
748 return pos ? NULL : fl;
749}
750
751static void *ip6fl_seq_start(struct seq_file *seq, loff_t *pos)
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000752 __acquires(RCU)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753{
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000754 rcu_read_lock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755 return *pos ? ip6fl_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
756}
757
758static void *ip6fl_seq_next(struct seq_file *seq, void *v, loff_t *pos)
759{
760 struct ip6_flowlabel *fl;
761
762 if (v == SEQ_START_TOKEN)
763 fl = ip6fl_get_first(seq);
764 else
765 fl = ip6fl_get_next(seq, v);
766 ++*pos;
767 return fl;
768}
769
770static void ip6fl_seq_stop(struct seq_file *seq, void *v)
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000771 __releases(RCU)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772{
YOSHIFUJI Hideaki / 吉藤英明d3aedd52013-01-30 09:27:47 +0000773 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774}
775
James Morris1b7c2db2006-10-31 00:43:44 -0800776static int ip6fl_seq_show(struct seq_file *seq, void *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777{
Eric W. Biederman4f82f452012-05-24 10:37:59 -0600778 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
Florent Fourcot869ba982014-11-04 23:01:00 +0100779 if (v == SEQ_START_TOKEN) {
Joe Perches1744bea2014-11-04 15:37:03 -0800780 seq_puts(seq, "Label S Owner Users Linger Expires Dst Opt\n");
Florent Fourcot869ba982014-11-04 23:01:00 +0100781 } else {
James Morris1b7c2db2006-10-31 00:43:44 -0800782 struct ip6_flowlabel *fl = v;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783 seq_printf(seq,
Harvey Harrison4b7a4272008-10-29 12:50:24 -0700784 "%05X %-1d %-6d %-6d %-6ld %-8ld %pi6 %-4d\n",
Eric Dumazet95c96172012-04-15 05:58:06 +0000785 (unsigned int)ntohl(fl->label),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 fl->share,
Eric W. Biederman4f82f452012-05-24 10:37:59 -0600787 ((fl->share == IPV6_FL_S_PROCESS) ?
788 pid_nr_ns(fl->owner.pid, state->pid_ns) :
789 ((fl->share == IPV6_FL_S_USER) ?
790 from_kuid_munged(seq_user_ns(seq), fl->owner.uid) :
791 0)),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792 atomic_read(&fl->users),
793 fl->linger/HZ,
794 (long)(fl->expires - jiffies)/HZ,
Harvey Harrisonb0711952008-10-28 16:05:40 -0700795 &fl->dst,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796 fl->opt ? fl->opt->opt_nflen : 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 return 0;
799}
800
Philippe De Muyter56b3d972007-07-10 23:07:31 -0700801static const struct seq_operations ip6fl_seq_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802 .start = ip6fl_seq_start,
803 .next = ip6fl_seq_next,
804 .stop = ip6fl_seq_stop,
805 .show = ip6fl_seq_show,
806};
807
808static int ip6fl_seq_open(struct inode *inode, struct file *file)
809{
Eric W. Biederman4f82f452012-05-24 10:37:59 -0600810 struct seq_file *seq;
811 struct ip6fl_iter_state *state;
812 int err;
813
814 err = seq_open_net(inode, file, &ip6fl_seq_ops,
815 sizeof(struct ip6fl_iter_state));
816
817 if (!err) {
818 seq = file->private_data;
819 state = ip6fl_seq_private(seq);
820 rcu_read_lock();
821 state->pid_ns = get_pid_ns(task_active_pid_ns(current));
822 rcu_read_unlock();
823 }
824 return err;
825}
826
827static int ip6fl_seq_release(struct inode *inode, struct file *file)
828{
829 struct seq_file *seq = file->private_data;
830 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
831 put_pid_ns(state->pid_ns);
832 return seq_release_net(inode, file);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833}
834
Arjan van de Ven9a321442007-02-12 00:55:35 -0800835static const struct file_operations ip6fl_seq_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836 .owner = THIS_MODULE,
837 .open = ip6fl_seq_open,
838 .read = seq_read,
839 .llseek = seq_lseek,
Eric W. Biederman4f82f452012-05-24 10:37:59 -0600840 .release = ip6fl_seq_release,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000843static int __net_init ip6_flowlabel_proc_init(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844{
Gao fengd4beaa62013-02-18 01:34:54 +0000845 if (!proc_create("ip6_flowlabel", S_IRUGO, net->proc_net,
846 &ip6fl_seq_fops))
Daniel Lezcano0a3e78a2007-12-11 02:23:18 -0800847 return -ENOMEM;
848 return 0;
849}
850
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000851static void __net_exit ip6_flowlabel_proc_fini(struct net *net)
Daniel Lezcano0a3e78a2007-12-11 02:23:18 -0800852{
Gao fengece31ff2013-02-18 01:34:56 +0000853 remove_proc_entry("ip6_flowlabel", net->proc_net);
Daniel Lezcano0a3e78a2007-12-11 02:23:18 -0800854}
855#else
856static inline int ip6_flowlabel_proc_init(struct net *net)
857{
858 return 0;
859}
860static inline void ip6_flowlabel_proc_fini(struct net *net)
861{
Daniel Lezcano0a3e78a2007-12-11 02:23:18 -0800862}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863#endif
Daniel Lezcano0a3e78a2007-12-11 02:23:18 -0800864
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000865static void __net_exit ip6_flowlabel_net_exit(struct net *net)
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700866{
867 ip6_fl_purge(net);
Benjamin Thery5983a3d2008-03-26 16:53:30 -0700868 ip6_flowlabel_proc_fini(net);
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700869}
870
871static struct pernet_operations ip6_flowlabel_net_ops = {
Benjamin Thery5983a3d2008-03-26 16:53:30 -0700872 .init = ip6_flowlabel_proc_init,
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700873 .exit = ip6_flowlabel_net_exit,
874};
875
Daniel Lezcano0a3e78a2007-12-11 02:23:18 -0800876int ip6_flowlabel_init(void)
877{
Benjamin Thery5983a3d2008-03-26 16:53:30 -0700878 return register_pernet_subsys(&ip6_flowlabel_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879}
880
881void ip6_flowlabel_cleanup(void)
882{
883 del_timer(&ip6_fl_gc_timer);
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700884 unregister_pernet_subsys(&ip6_flowlabel_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885}