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Merge tag 'gpio-v3.13-3' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw...
[linux-2.6.git] / net / ipv6 / ip6_flowlabel.c
blobe7fb7106550f1d0c45bfa59b341681175be588b2
1 /*
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
12 #include <linux/capability.h>
13 #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>
23 #include <linux/slab.h>
24 #include <linux/export.h>
25 #include <linux/pid_namespace.h>
26
27 #include <net/net_namespace.h>
28 #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 150 /* 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
53 static atomic_t fl_size = ATOMIC_INIT(0);
54 static struct ip6_flowlabel __rcu *fl_ht[FL_HASH_MASK+1];
55
56 static void ip6_fl_gc(unsigned long dummy);
57 static DEFINE_TIMER(ip6_fl_gc_timer, ip6_fl_gc, 0, 0);
58
59 /* FL hash table lock: it protects only of GC */
60
61 static DEFINE_SPINLOCK(ip6_fl_lock);
62
63 /* Big socket sock */
64
65 static DEFINE_SPINLOCK(ip6_sk_fl_lock);
66
67 #define for_each_fl_rcu(hash, fl) \
68 for (fl = rcu_dereference_bh(fl_ht[(hash)]); \
69 fl != NULL; \
70 fl = rcu_dereference_bh(fl->next))
71 #define for_each_fl_continue_rcu(fl) \
72 for (fl = rcu_dereference_bh(fl->next); \
73 fl != NULL; \
74 fl = rcu_dereference_bh(fl->next))
75
76 #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
81 static inline struct ip6_flowlabel *__fl_lookup(struct net *net, __be32 label)
82 {
83 struct ip6_flowlabel *fl;
84
85 for_each_fl_rcu(FL_HASH(label), fl) {
86 if (fl->label == label && net_eq(fl->fl_net, net))
87 return fl;
88 }
89 return NULL;
90 }
91
92 static struct ip6_flowlabel *fl_lookup(struct net *net, __be32 label)
93 {
94 struct ip6_flowlabel *fl;
95
96 rcu_read_lock_bh();
97 fl = __fl_lookup(net, label);
98 if (fl && !atomic_inc_not_zero(&fl->users))
99 fl = NULL;
100 rcu_read_unlock_bh();
101 return fl;
102 }
103
104
105 static void fl_free(struct ip6_flowlabel *fl)
106 {
107 if (fl) {
108 if (fl->share == IPV6_FL_S_PROCESS)
109 put_pid(fl->owner.pid);
110 release_net(fl->fl_net);
111 kfree(fl->opt);
112 kfree_rcu(fl, rcu);
113 }
114 }
115
116 static void fl_release(struct ip6_flowlabel *fl)
117 {
118 spin_lock_bh(&ip6_fl_lock);
119
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 }
135 spin_unlock_bh(&ip6_fl_lock);
136 }
137
138 static void ip6_fl_gc(unsigned long dummy)
139 {
140 int i;
141 unsigned long now = jiffies;
142 unsigned long sched = 0;
143
144 spin_lock(&ip6_fl_lock);
145
146 for (i=0; i<=FL_HASH_MASK; i++) {
147 struct ip6_flowlabel *fl;
148 struct ip6_flowlabel __rcu **flp;
149
150 flp = &fl_ht[i];
151 while ((fl = rcu_dereference_protected(*flp,
152 lockdep_is_held(&ip6_fl_lock))) != NULL) {
153 if (atomic_read(&fl->users) == 0) {
154 unsigned long ttd = fl->lastuse + fl->linger;
155 if (time_after(ttd, fl->expires))
156 fl->expires = ttd;
157 ttd = fl->expires;
158 if (time_after_eq(now, ttd)) {
159 *flp = fl->next;
160 fl_free(fl);
161 atomic_dec(&fl_size);
162 continue;
163 }
164 if (!sched || time_before(ttd, sched))
165 sched = ttd;
166 }
167 flp = &fl->next;
168 }
169 }
170 if (!sched && atomic_read(&fl_size))
171 sched = now + FL_MAX_LINGER;
172 if (sched) {
173 mod_timer(&ip6_fl_gc_timer, sched);
174 }
175 spin_unlock(&ip6_fl_lock);
176 }
177
178 static void __net_exit ip6_fl_purge(struct net *net)
179 {
180 int i;
181
182 spin_lock(&ip6_fl_lock);
183 for (i = 0; i <= FL_HASH_MASK; i++) {
184 struct ip6_flowlabel *fl;
185 struct ip6_flowlabel __rcu **flp;
186
187 flp = &fl_ht[i];
188 while ((fl = rcu_dereference_protected(*flp,
189 lockdep_is_held(&ip6_fl_lock))) != NULL) {
190 if (net_eq(fl->fl_net, net) &&
191 atomic_read(&fl->users) == 0) {
192 *flp = fl->next;
193 fl_free(fl);
194 atomic_dec(&fl_size);
195 continue;
196 }
197 flp = &fl->next;
198 }
199 }
200 spin_unlock(&ip6_fl_lock);
201 }
202
203 static struct ip6_flowlabel *fl_intern(struct net *net,
204 struct ip6_flowlabel *fl, __be32 label)
205 {
206 struct ip6_flowlabel *lfl;
207
208 fl->label = label & IPV6_FLOWLABEL_MASK;
209
210 spin_lock_bh(&ip6_fl_lock);
211 if (label == 0) {
212 for (;;) {
213 fl->label = htonl(net_random())&IPV6_FLOWLABEL_MASK;
214 if (fl->label) {
215 lfl = __fl_lookup(net, fl->label);
216 if (lfl == NULL)
217 break;
218 }
219 }
220 } else {
221 /*
222 * we dropper the ip6_fl_lock, so this entry could reappear
223 * and we need to recheck with it.
224 *
225 * OTOH no need to search the active socket first, like it is
226 * done in ipv6_flowlabel_opt - sock is locked, so new entry
227 * with the same label can only appear on another sock
228 */
229 lfl = __fl_lookup(net, fl->label);
230 if (lfl != NULL) {
231 atomic_inc(&lfl->users);
232 spin_unlock_bh(&ip6_fl_lock);
233 return lfl;
234 }
235 }
236
237 fl->lastuse = jiffies;
238 fl->next = fl_ht[FL_HASH(fl->label)];
239 rcu_assign_pointer(fl_ht[FL_HASH(fl->label)], fl);
240 atomic_inc(&fl_size);
241 spin_unlock_bh(&ip6_fl_lock);
242 return NULL;
243 }
244
245
246
247 /* Socket flowlabel lists */
248
249 struct ip6_flowlabel * fl6_sock_lookup(struct sock *sk, __be32 label)
250 {
251 struct ipv6_fl_socklist *sfl;
252 struct ipv6_pinfo *np = inet6_sk(sk);
253
254 label &= IPV6_FLOWLABEL_MASK;
255
256 rcu_read_lock_bh();
257 for_each_sk_fl_rcu(np, sfl) {
258 struct ip6_flowlabel *fl = sfl->fl;
259 if (fl->label == label) {
260 fl->lastuse = jiffies;
261 atomic_inc(&fl->users);
262 rcu_read_unlock_bh();
263 return fl;
264 }
265 }
266 rcu_read_unlock_bh();
267 return NULL;
268 }
269
270 EXPORT_SYMBOL_GPL(fl6_sock_lookup);
271
272 void fl6_free_socklist(struct sock *sk)
273 {
274 struct ipv6_pinfo *np = inet6_sk(sk);
275 struct ipv6_fl_socklist *sfl;
276
277 if (!rcu_access_pointer(np->ipv6_fl_list))
278 return;
279
280 spin_lock_bh(&ip6_sk_fl_lock);
281 while ((sfl = rcu_dereference_protected(np->ipv6_fl_list,
282 lockdep_is_held(&ip6_sk_fl_lock))) != NULL) {
283 np->ipv6_fl_list = sfl->next;
284 spin_unlock_bh(&ip6_sk_fl_lock);
285
286 fl_release(sfl->fl);
287 kfree_rcu(sfl, rcu);
288
289 spin_lock_bh(&ip6_sk_fl_lock);
290 }
291 spin_unlock_bh(&ip6_sk_fl_lock);
292 }
293
294 /* Service routines */
295
296
297 /*
298 It is the only difficult place. flowlabel enforces equal headers
299 before and including routing header, however user may supply options
300 following rthdr.
301 */
302
303 struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
304 struct ip6_flowlabel * fl,
305 struct ipv6_txoptions * fopt)
306 {
307 struct ipv6_txoptions * fl_opt = fl->opt;
308
309 if (fopt == NULL || fopt->opt_flen == 0)
310 return fl_opt;
311
312 if (fl_opt != NULL) {
313 opt_space->hopopt = fl_opt->hopopt;
314 opt_space->dst0opt = fl_opt->dst0opt;
315 opt_space->srcrt = fl_opt->srcrt;
316 opt_space->opt_nflen = fl_opt->opt_nflen;
317 } else {
318 if (fopt->opt_nflen == 0)
319 return fopt;
320 opt_space->hopopt = NULL;
321 opt_space->dst0opt = NULL;
322 opt_space->srcrt = NULL;
323 opt_space->opt_nflen = 0;
324 }
325 opt_space->dst1opt = fopt->dst1opt;
326 opt_space->opt_flen = fopt->opt_flen;
327 return opt_space;
328 }
329 EXPORT_SYMBOL_GPL(fl6_merge_options);
330
331 static unsigned long check_linger(unsigned long ttl)
332 {
333 if (ttl < FL_MIN_LINGER)
334 return FL_MIN_LINGER*HZ;
335 if (ttl > FL_MAX_LINGER && !capable(CAP_NET_ADMIN))
336 return 0;
337 return ttl*HZ;
338 }
339
340 static int fl6_renew(struct ip6_flowlabel *fl, unsigned long linger, unsigned long expires)
341 {
342 linger = check_linger(linger);
343 if (!linger)
344 return -EPERM;
345 expires = check_linger(expires);
346 if (!expires)
347 return -EPERM;
348
349 spin_lock_bh(&ip6_fl_lock);
350 fl->lastuse = jiffies;
351 if (time_before(fl->linger, linger))
352 fl->linger = linger;
353 if (time_before(expires, fl->linger))
354 expires = fl->linger;
355 if (time_before(fl->expires, fl->lastuse + expires))
356 fl->expires = fl->lastuse + expires;
357 spin_unlock_bh(&ip6_fl_lock);
358
359 return 0;
360 }
361
362 static struct ip6_flowlabel *
363 fl_create(struct net *net, struct sock *sk, struct in6_flowlabel_req *freq,
364 char __user *optval, int optlen, int *err_p)
365 {
366 struct ip6_flowlabel *fl = NULL;
367 int olen;
368 int addr_type;
369 int err;
370
371 olen = optlen - CMSG_ALIGN(sizeof(*freq));
372 err = -EINVAL;
373 if (olen > 64 * 1024)
374 goto done;
375
376 err = -ENOMEM;
377 fl = kzalloc(sizeof(*fl), GFP_KERNEL);
378 if (fl == NULL)
379 goto done;
380
381 if (olen > 0) {
382 struct msghdr msg;
383 struct flowi6 flowi6;
384 int junk;
385
386 err = -ENOMEM;
387 fl->opt = kmalloc(sizeof(*fl->opt) + olen, GFP_KERNEL);
388 if (fl->opt == NULL)
389 goto done;
390
391 memset(fl->opt, 0, sizeof(*fl->opt));
392 fl->opt->tot_len = sizeof(*fl->opt) + olen;
393 err = -EFAULT;
394 if (copy_from_user(fl->opt+1, optval+CMSG_ALIGN(sizeof(*freq)), olen))
395 goto done;
396
397 msg.msg_controllen = olen;
398 msg.msg_control = (void*)(fl->opt+1);
399 memset(&flowi6, 0, sizeof(flowi6));
400
401 err = ip6_datagram_send_ctl(net, sk, &msg, &flowi6, fl->opt,
402 &junk, &junk, &junk);
403 if (err)
404 goto done;
405 err = -EINVAL;
406 if (fl->opt->opt_flen)
407 goto done;
408 if (fl->opt->opt_nflen == 0) {
409 kfree(fl->opt);
410 fl->opt = NULL;
411 }
412 }
413
414 fl->fl_net = hold_net(net);
415 fl->expires = jiffies;
416 err = fl6_renew(fl, freq->flr_linger, freq->flr_expires);
417 if (err)
418 goto done;
419 fl->share = freq->flr_share;
420 addr_type = ipv6_addr_type(&freq->flr_dst);
421 if ((addr_type & IPV6_ADDR_MAPPED) ||
422 addr_type == IPV6_ADDR_ANY) {
423 err = -EINVAL;
424 goto done;
425 }
426 fl->dst = freq->flr_dst;
427 atomic_set(&fl->users, 1);
428 switch (fl->share) {
429 case IPV6_FL_S_EXCL:
430 case IPV6_FL_S_ANY:
431 break;
432 case IPV6_FL_S_PROCESS:
433 fl->owner.pid = get_task_pid(current, PIDTYPE_PID);
434 break;
435 case IPV6_FL_S_USER:
436 fl->owner.uid = current_euid();
437 break;
438 default:
439 err = -EINVAL;
440 goto done;
441 }
442 return fl;
443
444 done:
445 fl_free(fl);
446 *err_p = err;
447 return NULL;
448 }
449
450 static int mem_check(struct sock *sk)
451 {
452 struct ipv6_pinfo *np = inet6_sk(sk);
453 struct ipv6_fl_socklist *sfl;
454 int room = FL_MAX_SIZE - atomic_read(&fl_size);
455 int count = 0;
456
457 if (room > FL_MAX_SIZE - FL_MAX_PER_SOCK)
458 return 0;
459
460 rcu_read_lock_bh();
461 for_each_sk_fl_rcu(np, sfl)
462 count++;
463 rcu_read_unlock_bh();
464
465 if (room <= 0 ||
466 ((count >= FL_MAX_PER_SOCK ||
467 (count > 0 && room < FL_MAX_SIZE/2) || room < FL_MAX_SIZE/4) &&
468 !capable(CAP_NET_ADMIN)))
469 return -ENOBUFS;
470
471 return 0;
472 }
473
474 static inline void fl_link(struct ipv6_pinfo *np, struct ipv6_fl_socklist *sfl,
475 struct ip6_flowlabel *fl)
476 {
477 spin_lock_bh(&ip6_sk_fl_lock);
478 sfl->fl = fl;
479 sfl->next = np->ipv6_fl_list;
480 rcu_assign_pointer(np->ipv6_fl_list, sfl);
481 spin_unlock_bh(&ip6_sk_fl_lock);
482 }
483
484 int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq)
485 {
486 struct ipv6_pinfo *np = inet6_sk(sk);
487 struct ipv6_fl_socklist *sfl;
488
489 rcu_read_lock_bh();
490
491 for_each_sk_fl_rcu(np, sfl) {
492 if (sfl->fl->label == (np->flow_label & IPV6_FLOWLABEL_MASK)) {
493 spin_lock_bh(&ip6_fl_lock);
494 freq->flr_label = sfl->fl->label;
495 freq->flr_dst = sfl->fl->dst;
496 freq->flr_share = sfl->fl->share;
497 freq->flr_expires = (sfl->fl->expires - jiffies) / HZ;
498 freq->flr_linger = sfl->fl->linger / HZ;
499
500 spin_unlock_bh(&ip6_fl_lock);
501 rcu_read_unlock_bh();
502 return 0;
503 }
504 }
505 rcu_read_unlock_bh();
506
507 return -ENOENT;
508 }
509
510 int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen)
511 {
512 int uninitialized_var(err);
513 struct net *net = sock_net(sk);
514 struct ipv6_pinfo *np = inet6_sk(sk);
515 struct in6_flowlabel_req freq;
516 struct ipv6_fl_socklist *sfl1=NULL;
517 struct ipv6_fl_socklist *sfl;
518 struct ipv6_fl_socklist __rcu **sflp;
519 struct ip6_flowlabel *fl, *fl1 = NULL;
520
521
522 if (optlen < sizeof(freq))
523 return -EINVAL;
524
525 if (copy_from_user(&freq, optval, sizeof(freq)))
526 return -EFAULT;
527
528 switch (freq.flr_action) {
529 case IPV6_FL_A_PUT:
530 spin_lock_bh(&ip6_sk_fl_lock);
531 for (sflp = &np->ipv6_fl_list;
532 (sfl = rcu_dereference(*sflp))!=NULL;
533 sflp = &sfl->next) {
534 if (sfl->fl->label == freq.flr_label) {
535 if (freq.flr_label == (np->flow_label&IPV6_FLOWLABEL_MASK))
536 np->flow_label &= ~IPV6_FLOWLABEL_MASK;
537 *sflp = rcu_dereference(sfl->next);
538 spin_unlock_bh(&ip6_sk_fl_lock);
539 fl_release(sfl->fl);
540 kfree_rcu(sfl, rcu);
541 return 0;
542 }
543 }
544 spin_unlock_bh(&ip6_sk_fl_lock);
545 return -ESRCH;
546
547 case IPV6_FL_A_RENEW:
548 rcu_read_lock_bh();
549 for_each_sk_fl_rcu(np, sfl) {
550 if (sfl->fl->label == freq.flr_label) {
551 err = fl6_renew(sfl->fl, freq.flr_linger, freq.flr_expires);
552 rcu_read_unlock_bh();
553 return err;
554 }
555 }
556 rcu_read_unlock_bh();
557
558 if (freq.flr_share == IPV6_FL_S_NONE &&
559 ns_capable(net->user_ns, CAP_NET_ADMIN)) {
560 fl = fl_lookup(net, freq.flr_label);
561 if (fl) {
562 err = fl6_renew(fl, freq.flr_linger, freq.flr_expires);
563 fl_release(fl);
564 return err;
565 }
566 }
567 return -ESRCH;
568
569 case IPV6_FL_A_GET:
570 if (freq.flr_label & ~IPV6_FLOWLABEL_MASK)
571 return -EINVAL;
572
573 fl = fl_create(net, sk, &freq, optval, optlen, &err);
574 if (fl == NULL)
575 return err;
576 sfl1 = kmalloc(sizeof(*sfl1), GFP_KERNEL);
577
578 if (freq.flr_label) {
579 err = -EEXIST;
580 rcu_read_lock_bh();
581 for_each_sk_fl_rcu(np, sfl) {
582 if (sfl->fl->label == freq.flr_label) {
583 if (freq.flr_flags&IPV6_FL_F_EXCL) {
584 rcu_read_unlock_bh();
585 goto done;
586 }
587 fl1 = sfl->fl;
588 atomic_inc(&fl1->users);
589 break;
590 }
591 }
592 rcu_read_unlock_bh();
593
594 if (fl1 == NULL)
595 fl1 = fl_lookup(net, freq.flr_label);
596 if (fl1) {
597 recheck:
598 err = -EEXIST;
599 if (freq.flr_flags&IPV6_FL_F_EXCL)
600 goto release;
601 err = -EPERM;
602 if (fl1->share == IPV6_FL_S_EXCL ||
603 fl1->share != fl->share ||
604 ((fl1->share == IPV6_FL_S_PROCESS) &&
605 (fl1->owner.pid == fl->owner.pid)) ||
606 ((fl1->share == IPV6_FL_S_USER) &&
607 uid_eq(fl1->owner.uid, fl->owner.uid)))
608 goto release;
609
610 err = -ENOMEM;
611 if (sfl1 == NULL)
612 goto release;
613 if (fl->linger > fl1->linger)
614 fl1->linger = fl->linger;
615 if ((long)(fl->expires - fl1->expires) > 0)
616 fl1->expires = fl->expires;
617 fl_link(np, sfl1, fl1);
618 fl_free(fl);
619 return 0;
620
621 release:
622 fl_release(fl1);
623 goto done;
624 }
625 }
626 err = -ENOENT;
627 if (!(freq.flr_flags&IPV6_FL_F_CREATE))
628 goto done;
629
630 err = -ENOMEM;
631 if (sfl1 == NULL || (err = mem_check(sk)) != 0)
632 goto done;
633
634 fl1 = fl_intern(net, fl, freq.flr_label);
635 if (fl1 != NULL)
636 goto recheck;
637
638 if (!freq.flr_label) {
639 if (copy_to_user(&((struct in6_flowlabel_req __user *) optval)->flr_label,
640 &fl->label, sizeof(fl->label))) {
641 /* Intentionally ignore fault. */
642 }
643 }
644
645 fl_link(np, sfl1, fl);
646 return 0;
647
648 default:
649 return -EINVAL;
650 }
651
652 done:
653 fl_free(fl);
654 kfree(sfl1);
655 return err;
656 }
657
658 #ifdef CONFIG_PROC_FS
659
660 struct ip6fl_iter_state {
661 struct seq_net_private p;
662 struct pid_namespace *pid_ns;
663 int bucket;
664 };
665
666 #define ip6fl_seq_private(seq) ((struct ip6fl_iter_state *)(seq)->private)
667
668 static struct ip6_flowlabel *ip6fl_get_first(struct seq_file *seq)
669 {
670 struct ip6_flowlabel *fl = NULL;
671 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
672 struct net *net = seq_file_net(seq);
673
674 for (state->bucket = 0; state->bucket <= FL_HASH_MASK; ++state->bucket) {
675 for_each_fl_rcu(state->bucket, fl) {
676 if (net_eq(fl->fl_net, net))
677 goto out;
678 }
679 }
680 fl = NULL;
681 out:
682 return fl;
683 }
684
685 static struct ip6_flowlabel *ip6fl_get_next(struct seq_file *seq, struct ip6_flowlabel *fl)
686 {
687 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
688 struct net *net = seq_file_net(seq);
689
690 for_each_fl_continue_rcu(fl) {
691 if (net_eq(fl->fl_net, net))
692 goto out;
693 }
694
695 try_again:
696 if (++state->bucket <= FL_HASH_MASK) {
697 for_each_fl_rcu(state->bucket, fl) {
698 if (net_eq(fl->fl_net, net))
699 goto out;
700 }
701 goto try_again;
702 }
703 fl = NULL;
704
705 out:
706 return fl;
707 }
708
709 static struct ip6_flowlabel *ip6fl_get_idx(struct seq_file *seq, loff_t pos)
710 {
711 struct ip6_flowlabel *fl = ip6fl_get_first(seq);
712 if (fl)
713 while (pos && (fl = ip6fl_get_next(seq, fl)) != NULL)
714 --pos;
715 return pos ? NULL : fl;
716 }
717
718 static void *ip6fl_seq_start(struct seq_file *seq, loff_t *pos)
719 __acquires(RCU)
720 {
721 rcu_read_lock_bh();
722 return *pos ? ip6fl_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
723 }
724
725 static void *ip6fl_seq_next(struct seq_file *seq, void *v, loff_t *pos)
726 {
727 struct ip6_flowlabel *fl;
728
729 if (v == SEQ_START_TOKEN)
730 fl = ip6fl_get_first(seq);
731 else
732 fl = ip6fl_get_next(seq, v);
733 ++*pos;
734 return fl;
735 }
736
737 static void ip6fl_seq_stop(struct seq_file *seq, void *v)
738 __releases(RCU)
739 {
740 rcu_read_unlock_bh();
741 }
742
743 static int ip6fl_seq_show(struct seq_file *seq, void *v)
744 {
745 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
746 if (v == SEQ_START_TOKEN)
747 seq_printf(seq, "%-5s %-1s %-6s %-6s %-6s %-8s %-32s %s\n",
748 "Label", "S", "Owner", "Users", "Linger", "Expires", "Dst", "Opt");
749 else {
750 struct ip6_flowlabel *fl = v;
751 seq_printf(seq,
752 "%05X %-1d %-6d %-6d %-6ld %-8ld %pi6 %-4d\n",
753 (unsigned int)ntohl(fl->label),
754 fl->share,
755 ((fl->share == IPV6_FL_S_PROCESS) ?
756 pid_nr_ns(fl->owner.pid, state->pid_ns) :
757 ((fl->share == IPV6_FL_S_USER) ?
758 from_kuid_munged(seq_user_ns(seq), fl->owner.uid) :
759 0)),
760 atomic_read(&fl->users),
761 fl->linger/HZ,
762 (long)(fl->expires - jiffies)/HZ,
763 &fl->dst,
764 fl->opt ? fl->opt->opt_nflen : 0);
765 }
766 return 0;
767 }
768
769 static const struct seq_operations ip6fl_seq_ops = {
770 .start = ip6fl_seq_start,
771 .next = ip6fl_seq_next,
772 .stop = ip6fl_seq_stop,
773 .show = ip6fl_seq_show,
774 };
775
776 static int ip6fl_seq_open(struct inode *inode, struct file *file)
777 {
778 struct seq_file *seq;
779 struct ip6fl_iter_state *state;
780 int err;
781
782 err = seq_open_net(inode, file, &ip6fl_seq_ops,
783 sizeof(struct ip6fl_iter_state));
784
785 if (!err) {
786 seq = file->private_data;
787 state = ip6fl_seq_private(seq);
788 rcu_read_lock();
789 state->pid_ns = get_pid_ns(task_active_pid_ns(current));
790 rcu_read_unlock();
791 }
792 return err;
793 }
794
795 static int ip6fl_seq_release(struct inode *inode, struct file *file)
796 {
797 struct seq_file *seq = file->private_data;
798 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
799 put_pid_ns(state->pid_ns);
800 return seq_release_net(inode, file);
801 }
802
803 static const struct file_operations ip6fl_seq_fops = {
804 .owner = THIS_MODULE,
805 .open = ip6fl_seq_open,
806 .read = seq_read,
807 .llseek = seq_lseek,
808 .release = ip6fl_seq_release,
809 };
810
811 static int __net_init ip6_flowlabel_proc_init(struct net *net)
812 {
813 if (!proc_create("ip6_flowlabel", S_IRUGO, net->proc_net,
814 &ip6fl_seq_fops))
815 return -ENOMEM;
816 return 0;
817 }
818
819 static void __net_exit ip6_flowlabel_proc_fini(struct net *net)
820 {
821 remove_proc_entry("ip6_flowlabel", net->proc_net);
822 }
823 #else
824 static inline int ip6_flowlabel_proc_init(struct net *net)
825 {
826 return 0;
827 }
828 static inline void ip6_flowlabel_proc_fini(struct net *net)
829 {
830 }
831 #endif
832
833 static void __net_exit ip6_flowlabel_net_exit(struct net *net)
834 {
835 ip6_fl_purge(net);
836 ip6_flowlabel_proc_fini(net);
837 }
838
839 static struct pernet_operations ip6_flowlabel_net_ops = {
840 .init = ip6_flowlabel_proc_init,
841 .exit = ip6_flowlabel_net_exit,
842 };
843
844 int ip6_flowlabel_init(void)
845 {
846 return register_pernet_subsys(&ip6_flowlabel_net_ops);
847 }
848
849 void ip6_flowlabel_cleanup(void)
850 {
851 del_timer(&ip6_fl_gc_timer);
852 unregister_pernet_subsys(&ip6_flowlabel_net_ops);
853 }
Linus' kernel tree