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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/in6.h>
19#include <linux/proc_fs.h>
20#include <linux/seq_file.h>
21#include <linux/slab.h>
22#include <linux/export.h>
23#include <linux/pid_namespace.h>
24
25#include <net/net_namespace.h>
26#include <net/sock.h>
27
28#include <net/ipv6.h>
29#include <net/rawv6.h>
30#include <net/transp_v6.h>
31
32#include <asm/uaccess.h>
33
34#define FL_MIN_LINGER 6
35
36
37#define FL_MAX_LINGER 150
38
39
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);
47static struct ip6_flowlabel __rcu *fl_ht[FL_HASH_MASK+1];
48
49static void ip6_fl_gc(unsigned long dummy);
50static DEFINE_TIMER(ip6_fl_gc_timer, ip6_fl_gc, 0, 0);
51
52
53
54static DEFINE_SPINLOCK(ip6_fl_lock);
55
56
57
58static DEFINE_SPINLOCK(ip6_sk_fl_lock);
59
60#define for_each_fl_rcu(hash, fl) \
61 for (fl = rcu_dereference_bh(fl_ht[(hash)]); \
62 fl != NULL; \
63 fl = rcu_dereference_bh(fl->next))
64#define for_each_fl_continue_rcu(fl) \
65 for (fl = rcu_dereference_bh(fl->next); \
66 fl != NULL; \
67 fl = rcu_dereference_bh(fl->next))
68
69#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
74static inline struct ip6_flowlabel *__fl_lookup(struct net *net, __be32 label)
75{
76 struct ip6_flowlabel *fl;
77
78 for_each_fl_rcu(FL_HASH(label), fl) {
79 if (fl->label == label && net_eq(fl->fl_net, net))
80 return fl;
81 }
82 return NULL;
83}
84
85static struct ip6_flowlabel *fl_lookup(struct net *net, __be32 label)
86{
87 struct ip6_flowlabel *fl;
88
89 rcu_read_lock_bh();
90 fl = __fl_lookup(net, label);
91 if (fl && !atomic_inc_not_zero(&fl->users))
92 fl = NULL;
93 rcu_read_unlock_bh();
94 return fl;
95}
96
97
98static void fl_free(struct ip6_flowlabel *fl)
99{
100 if (fl) {
101 if (fl->share == IPV6_FL_S_PROCESS)
102 put_pid(fl->owner.pid);
103 kfree(fl->opt);
104 kfree_rcu(fl, rcu);
105 }
106}
107
108static void fl_release(struct ip6_flowlabel *fl)
109{
110 spin_lock_bh(&ip6_fl_lock);
111
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 }
127 spin_unlock_bh(&ip6_fl_lock);
128}
129
130static void ip6_fl_gc(unsigned long dummy)
131{
132 int i;
133 unsigned long now = jiffies;
134 unsigned long sched = 0;
135
136 spin_lock(&ip6_fl_lock);
137
138 for (i = 0; i <= FL_HASH_MASK; i++) {
139 struct ip6_flowlabel *fl;
140 struct ip6_flowlabel __rcu **flp;
141
142 flp = &fl_ht[i];
143 while ((fl = rcu_dereference_protected(*flp,
144 lockdep_is_held(&ip6_fl_lock))) != NULL) {
145 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) {
165 mod_timer(&ip6_fl_gc_timer, sched);
166 }
167 spin_unlock(&ip6_fl_lock);
168}
169
170static void __net_exit ip6_fl_purge(struct net *net)
171{
172 int i;
173
174 spin_lock_bh(&ip6_fl_lock);
175 for (i = 0; i <= FL_HASH_MASK; i++) {
176 struct ip6_flowlabel *fl;
177 struct ip6_flowlabel __rcu **flp;
178
179 flp = &fl_ht[i];
180 while ((fl = rcu_dereference_protected(*flp,
181 lockdep_is_held(&ip6_fl_lock))) != NULL) {
182 if (net_eq(fl->fl_net, net) &&
183 atomic_read(&fl->users) == 0) {
184 *flp = fl->next;
185 fl_free(fl);
186 atomic_dec(&fl_size);
187 continue;
188 }
189 flp = &fl->next;
190 }
191 }
192 spin_unlock_bh(&ip6_fl_lock);
193}
194
195static struct ip6_flowlabel *fl_intern(struct net *net,
196 struct ip6_flowlabel *fl, __be32 label)
197{
198 struct ip6_flowlabel *lfl;
199
200 fl->label = label & IPV6_FLOWLABEL_MASK;
201
202 spin_lock_bh(&ip6_fl_lock);
203 if (label == 0) {
204 for (;;) {
205 fl->label = htonl(prandom_u32())&IPV6_FLOWLABEL_MASK;
206 if (fl->label) {
207 lfl = __fl_lookup(net, fl->label);
208 if (!lfl)
209 break;
210 }
211 }
212 } else {
213
214
215
216
217
218
219
220
221 lfl = __fl_lookup(net, fl->label);
222 if (lfl) {
223 atomic_inc(&lfl->users);
224 spin_unlock_bh(&ip6_fl_lock);
225 return lfl;
226 }
227 }
228
229 fl->lastuse = jiffies;
230 fl->next = fl_ht[FL_HASH(fl->label)];
231 rcu_assign_pointer(fl_ht[FL_HASH(fl->label)], fl);
232 atomic_inc(&fl_size);
233 spin_unlock_bh(&ip6_fl_lock);
234 return NULL;
235}
236
237
238
239
240
241struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label)
242{
243 struct ipv6_fl_socklist *sfl;
244 struct ipv6_pinfo *np = inet6_sk(sk);
245
246 label &= IPV6_FLOWLABEL_MASK;
247
248 rcu_read_lock_bh();
249 for_each_sk_fl_rcu(np, sfl) {
250 struct ip6_flowlabel *fl = sfl->fl;
251 if (fl->label == label) {
252 fl->lastuse = jiffies;
253 atomic_inc(&fl->users);
254 rcu_read_unlock_bh();
255 return fl;
256 }
257 }
258 rcu_read_unlock_bh();
259 return NULL;
260}
261EXPORT_SYMBOL_GPL(fl6_sock_lookup);
262
263void fl6_free_socklist(struct sock *sk)
264{
265 struct ipv6_pinfo *np = inet6_sk(sk);
266 struct ipv6_fl_socklist *sfl;
267
268 if (!rcu_access_pointer(np->ipv6_fl_list))
269 return;
270
271 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);
276
277 fl_release(sfl->fl);
278 kfree_rcu(sfl, rcu);
279
280 spin_lock_bh(&ip6_sk_fl_lock);
281 }
282 spin_unlock_bh(&ip6_sk_fl_lock);
283}
284
285
286
287
288
289
290
291
292
293
294struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space,
295 struct ip6_flowlabel *fl,
296 struct ipv6_txoptions *fopt)
297{
298 struct ipv6_txoptions *fl_opt = fl->opt;
299
300 if (!fopt || fopt->opt_flen == 0)
301 return fl_opt;
302
303 if (fl_opt) {
304 opt_space->hopopt = fl_opt->hopopt;
305 opt_space->dst0opt = fl_opt->dst0opt;
306 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;
317 opt_space->opt_flen = fopt->opt_flen;
318 return opt_space;
319}
320EXPORT_SYMBOL_GPL(fl6_merge_options);
321
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;
339
340 spin_lock_bh(&ip6_fl_lock);
341 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;
348 spin_unlock_bh(&ip6_fl_lock);
349
350 return 0;
351}
352
353static struct ip6_flowlabel *
354fl_create(struct net *net, struct sock *sk, struct in6_flowlabel_req *freq,
355 char __user *optval, int optlen, int *err_p)
356{
357 struct ip6_flowlabel *fl = NULL;
358 int olen;
359 int addr_type;
360 int err;
361
362 olen = optlen - CMSG_ALIGN(sizeof(*freq));
363 err = -EINVAL;
364 if (olen > 64 * 1024)
365 goto done;
366
367 err = -ENOMEM;
368 fl = kzalloc(sizeof(*fl), GFP_KERNEL);
369 if (!fl)
370 goto done;
371
372 if (olen > 0) {
373 struct msghdr msg;
374 struct flowi6 flowi6;
375 int junk;
376
377 err = -ENOMEM;
378 fl->opt = kmalloc(sizeof(*fl->opt) + olen, GFP_KERNEL);
379 if (!fl->opt)
380 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;
389 msg.msg_control = (void *)(fl->opt+1);
390 memset(&flowi6, 0, sizeof(flowi6));
391
392 err = ip6_datagram_send_ctl(net, sk, &msg, &flowi6, fl->opt,
393 &junk, &junk, &junk);
394 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
405 fl->fl_net = net;
406 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);
412 if ((addr_type & IPV6_ADDR_MAPPED) ||
413 addr_type == IPV6_ADDR_ANY) {
414 err = -EINVAL;
415 goto done;
416 }
417 fl->dst = freq->flr_dst;
418 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:
424 fl->owner.pid = get_task_pid(current, PIDTYPE_PID);
425 break;
426 case IPV6_FL_S_USER:
427 fl->owner.uid = current_euid();
428 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
451 rcu_read_lock_bh();
452 for_each_sk_fl_rcu(np, sfl)
453 count++;
454 rcu_read_unlock_bh();
455
456 if (room <= 0 ||
457 ((count >= FL_MAX_PER_SOCK ||
458 (count > 0 && room < FL_MAX_SIZE/2) || room < FL_MAX_SIZE/4) &&
459 !capable(CAP_NET_ADMIN)))
460 return -ENOBUFS;
461
462 return 0;
463}
464
465static inline void fl_link(struct ipv6_pinfo *np, struct ipv6_fl_socklist *sfl,
466 struct ip6_flowlabel *fl)
467{
468 spin_lock_bh(&ip6_sk_fl_lock);
469 sfl->fl = fl;
470 sfl->next = np->ipv6_fl_list;
471 rcu_assign_pointer(np->ipv6_fl_list, sfl);
472 spin_unlock_bh(&ip6_sk_fl_lock);
473}
474
475int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
476 int flags)
477{
478 struct ipv6_pinfo *np = inet6_sk(sk);
479 struct ipv6_fl_socklist *sfl;
480
481 if (flags & IPV6_FL_F_REMOTE) {
482 freq->flr_label = np->rcv_flowinfo & IPV6_FLOWLABEL_MASK;
483 return 0;
484 }
485
486 if (np->repflow) {
487 freq->flr_label = np->flow_label;
488 return 0;
489 }
490
491 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
512int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen)
513{
514 int uninitialized_var(err);
515 struct net *net = sock_net(sk);
516 struct ipv6_pinfo *np = inet6_sk(sk);
517 struct in6_flowlabel_req freq;
518 struct ipv6_fl_socklist *sfl1 = NULL;
519 struct ipv6_fl_socklist *sfl;
520 struct ipv6_fl_socklist __rcu **sflp;
521 struct ip6_flowlabel *fl, *fl1 = NULL;
522
523
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:
532 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 }
541 spin_lock_bh(&ip6_sk_fl_lock);
542 for (sflp = &np->ipv6_fl_list;
543 (sfl = rcu_dereference(*sflp)) != NULL;
544 sflp = &sfl->next) {
545 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;
548 *sflp = rcu_dereference(sfl->next);
549 spin_unlock_bh(&ip6_sk_fl_lock);
550 fl_release(sfl->fl);
551 kfree_rcu(sfl, rcu);
552 return 0;
553 }
554 }
555 spin_unlock_bh(&ip6_sk_fl_lock);
556 return -ESRCH;
557
558 case IPV6_FL_A_RENEW:
559 rcu_read_lock_bh();
560 for_each_sk_fl_rcu(np, sfl) {
561 if (sfl->fl->label == freq.flr_label) {
562 err = fl6_renew(sfl->fl, freq.flr_linger, freq.flr_expires);
563 rcu_read_unlock_bh();
564 return err;
565 }
566 }
567 rcu_read_unlock_bh();
568
569 if (freq.flr_share == IPV6_FL_S_NONE &&
570 ns_capable(net->user_ns, CAP_NET_ADMIN)) {
571 fl = fl_lookup(net, freq.flr_label);
572 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:
581 if (freq.flr_flags & IPV6_FL_F_REFLECT) {
582 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
588 if (sk->sk_protocol != IPPROTO_TCP)
589 return -ENOPROTOOPT;
590
591 np->repflow = 1;
592 return 0;
593 }
594
595 if (freq.flr_label & ~IPV6_FLOWLABEL_MASK)
596 return -EINVAL;
597
598 fl = fl_create(net, sk, &freq, optval, optlen, &err);
599 if (!fl)
600 return err;
601 sfl1 = kmalloc(sizeof(*sfl1), GFP_KERNEL);
602
603 if (freq.flr_label) {
604 err = -EEXIST;
605 rcu_read_lock_bh();
606 for_each_sk_fl_rcu(np, sfl) {
607 if (sfl->fl->label == freq.flr_label) {
608 if (freq.flr_flags&IPV6_FL_F_EXCL) {
609 rcu_read_unlock_bh();
610 goto done;
611 }
612 fl1 = sfl->fl;
613 atomic_inc(&fl1->users);
614 break;
615 }
616 }
617 rcu_read_unlock_bh();
618
619 if (!fl1)
620 fl1 = fl_lookup(net, freq.flr_label);
621 if (fl1) {
622recheck:
623 err = -EEXIST;
624 if (freq.flr_flags&IPV6_FL_F_EXCL)
625 goto release;
626 err = -EPERM;
627 if (fl1->share == IPV6_FL_S_EXCL ||
628 fl1->share != fl->share ||
629 ((fl1->share == IPV6_FL_S_PROCESS) &&
630 (fl1->owner.pid == fl->owner.pid)) ||
631 ((fl1->share == IPV6_FL_S_USER) &&
632 uid_eq(fl1->owner.uid, fl->owner.uid)))
633 goto release;
634
635 err = -ENOMEM;
636 if (!sfl1)
637 goto release;
638 if (fl->linger > fl1->linger)
639 fl1->linger = fl->linger;
640 if ((long)(fl->expires - fl1->expires) > 0)
641 fl1->expires = fl->expires;
642 fl_link(np, sfl1, fl1);
643 fl_free(fl);
644 return 0;
645
646release:
647 fl_release(fl1);
648 goto done;
649 }
650 }
651 err = -ENOENT;
652 if (!(freq.flr_flags&IPV6_FL_F_CREATE))
653 goto done;
654
655 err = -ENOMEM;
656 if (!sfl1)
657 goto done;
658
659 err = mem_check(sk);
660 if (err != 0)
661 goto done;
662
663 fl1 = fl_intern(net, fl, freq.flr_label);
664 if (fl1)
665 goto recheck;
666
667 if (!freq.flr_label) {
668 if (copy_to_user(&((struct in6_flowlabel_req __user *) optval)->flr_label,
669 &fl->label, sizeof(fl->label))) {
670
671 }
672 }
673
674 fl_link(np, sfl1, fl);
675 return 0;
676
677 default:
678 return -EINVAL;
679 }
680
681done:
682 fl_free(fl);
683 kfree(sfl1);
684 return err;
685}
686
687#ifdef CONFIG_PROC_FS
688
689struct ip6fl_iter_state {
690 struct seq_net_private p;
691 struct pid_namespace *pid_ns;
692 int bucket;
693};
694
695#define ip6fl_seq_private(seq) ((struct ip6fl_iter_state *)(seq)->private)
696
697static struct ip6_flowlabel *ip6fl_get_first(struct seq_file *seq)
698{
699 struct ip6_flowlabel *fl = NULL;
700 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
701 struct net *net = seq_file_net(seq);
702
703 for (state->bucket = 0; state->bucket <= FL_HASH_MASK; ++state->bucket) {
704 for_each_fl_rcu(state->bucket, fl) {
705 if (net_eq(fl->fl_net, net))
706 goto out;
707 }
708 }
709 fl = NULL;
710out:
711 return fl;
712}
713
714static struct ip6_flowlabel *ip6fl_get_next(struct seq_file *seq, struct ip6_flowlabel *fl)
715{
716 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
717 struct net *net = seq_file_net(seq);
718
719 for_each_fl_continue_rcu(fl) {
720 if (net_eq(fl->fl_net, net))
721 goto out;
722 }
723
724try_again:
725 if (++state->bucket <= FL_HASH_MASK) {
726 for_each_fl_rcu(state->bucket, fl) {
727 if (net_eq(fl->fl_net, net))
728 goto out;
729 }
730 goto try_again;
731 }
732 fl = NULL;
733
734out:
735 return fl;
736}
737
738static struct ip6_flowlabel *ip6fl_get_idx(struct seq_file *seq, loff_t pos)
739{
740 struct ip6_flowlabel *fl = ip6fl_get_first(seq);
741 if (fl)
742 while (pos && (fl = ip6fl_get_next(seq, fl)) != NULL)
743 --pos;
744 return pos ? NULL : fl;
745}
746
747static void *ip6fl_seq_start(struct seq_file *seq, loff_t *pos)
748 __acquires(RCU)
749{
750 rcu_read_lock_bh();
751 return *pos ? ip6fl_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
752}
753
754static void *ip6fl_seq_next(struct seq_file *seq, void *v, loff_t *pos)
755{
756 struct ip6_flowlabel *fl;
757
758 if (v == SEQ_START_TOKEN)
759 fl = ip6fl_get_first(seq);
760 else
761 fl = ip6fl_get_next(seq, v);
762 ++*pos;
763 return fl;
764}
765
766static void ip6fl_seq_stop(struct seq_file *seq, void *v)
767 __releases(RCU)
768{
769 rcu_read_unlock_bh();
770}
771
772static int ip6fl_seq_show(struct seq_file *seq, void *v)
773{
774 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
775 if (v == SEQ_START_TOKEN) {
776 seq_puts(seq, "Label S Owner Users Linger Expires Dst Opt\n");
777 } else {
778 struct ip6_flowlabel *fl = v;
779 seq_printf(seq,
780 "%05X %-1d %-6d %-6d %-6ld %-8ld %pi6 %-4d\n",
781 (unsigned int)ntohl(fl->label),
782 fl->share,
783 ((fl->share == IPV6_FL_S_PROCESS) ?
784 pid_nr_ns(fl->owner.pid, state->pid_ns) :
785 ((fl->share == IPV6_FL_S_USER) ?
786 from_kuid_munged(seq_user_ns(seq), fl->owner.uid) :
787 0)),
788 atomic_read(&fl->users),
789 fl->linger/HZ,
790 (long)(fl->expires - jiffies)/HZ,
791 &fl->dst,
792 fl->opt ? fl->opt->opt_nflen : 0);
793 }
794 return 0;
795}
796
797static const struct seq_operations ip6fl_seq_ops = {
798 .start = ip6fl_seq_start,
799 .next = ip6fl_seq_next,
800 .stop = ip6fl_seq_stop,
801 .show = ip6fl_seq_show,
802};
803
804static int ip6fl_seq_open(struct inode *inode, struct file *file)
805{
806 struct seq_file *seq;
807 struct ip6fl_iter_state *state;
808 int err;
809
810 err = seq_open_net(inode, file, &ip6fl_seq_ops,
811 sizeof(struct ip6fl_iter_state));
812
813 if (!err) {
814 seq = file->private_data;
815 state = ip6fl_seq_private(seq);
816 rcu_read_lock();
817 state->pid_ns = get_pid_ns(task_active_pid_ns(current));
818 rcu_read_unlock();
819 }
820 return err;
821}
822
823static int ip6fl_seq_release(struct inode *inode, struct file *file)
824{
825 struct seq_file *seq = file->private_data;
826 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
827 put_pid_ns(state->pid_ns);
828 return seq_release_net(inode, file);
829}
830
831static const struct file_operations ip6fl_seq_fops = {
832 .owner = THIS_MODULE,
833 .open = ip6fl_seq_open,
834 .read = seq_read,
835 .llseek = seq_lseek,
836 .release = ip6fl_seq_release,
837};
838
839static int __net_init ip6_flowlabel_proc_init(struct net *net)
840{
841 if (!proc_create("ip6_flowlabel", S_IRUGO, net->proc_net,
842 &ip6fl_seq_fops))
843 return -ENOMEM;
844 return 0;
845}
846
847static void __net_exit ip6_flowlabel_proc_fini(struct net *net)
848{
849 remove_proc_entry("ip6_flowlabel", net->proc_net);
850}
851#else
852static inline int ip6_flowlabel_proc_init(struct net *net)
853{
854 return 0;
855}
856static inline void ip6_flowlabel_proc_fini(struct net *net)
857{
858}
859#endif
860
861static void __net_exit ip6_flowlabel_net_exit(struct net *net)
862{
863 ip6_fl_purge(net);
864 ip6_flowlabel_proc_fini(net);
865}
866
867static struct pernet_operations ip6_flowlabel_net_ops = {
868 .init = ip6_flowlabel_proc_init,
869 .exit = ip6_flowlabel_net_exit,
870};
871
872int ip6_flowlabel_init(void)
873{
874 return register_pernet_subsys(&ip6_flowlabel_net_ops);
875}
876
877void ip6_flowlabel_cleanup(void)
878{
879 del_timer(&ip6_fl_gc_timer);
880 unregister_pernet_subsys(&ip6_flowlabel_net_ops);
881}
882
