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[mirror_ubuntu-bionic-kernel.git] / net / ipv6 / ip6_flowlabel.c
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/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 <linux/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 */
37 #define FL_MAX_LINGER 150 /* Maximal linger timeout */
38
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
46 static atomic_t fl_size = ATOMIC_INIT(0);
47 static struct ip6_flowlabel __rcu *fl_ht[FL_HASH_MASK+1];
48
49 static void ip6_fl_gc(struct timer_list *unused);
50 static DEFINE_TIMER(ip6_fl_gc_timer, ip6_fl_gc);
51
52 /* FL hash table lock: it protects only of GC */
53
54 static DEFINE_SPINLOCK(ip6_fl_lock);
55
56 /* Big socket sock */
57
58 static 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
74 static 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
85 static 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
98 static 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
108 static 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
130 static void ip6_fl_gc(struct timer_list *unused)
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
170 static 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
195 static 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 * 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 */
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 /* Socket flowlabel lists */
240
241 struct 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 }
261 EXPORT_SYMBOL_GPL(fl6_sock_lookup);
262
263 void 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 /* 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
294 struct 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 opt_space->tot_len = fopt->tot_len;
319 return opt_space;
320 }
321 EXPORT_SYMBOL_GPL(fl6_merge_options);
322
323 static 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
332 static 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;
340
341 spin_lock_bh(&ip6_fl_lock);
342 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;
349 spin_unlock_bh(&ip6_fl_lock);
350
351 return 0;
352 }
353
354 static struct ip6_flowlabel *
355 fl_create(struct net *net, struct sock *sk, struct in6_flowlabel_req *freq,
356 char __user *optval, int optlen, int *err_p)
357 {
358 struct ip6_flowlabel *fl = NULL;
359 int olen;
360 int addr_type;
361 int err;
362
363 olen = optlen - CMSG_ALIGN(sizeof(*freq));
364 err = -EINVAL;
365 if (olen > 64 * 1024)
366 goto done;
367
368 err = -ENOMEM;
369 fl = kzalloc(sizeof(*fl), GFP_KERNEL);
370 if (!fl)
371 goto done;
372
373 if (olen > 0) {
374 struct msghdr msg;
375 struct flowi6 flowi6;
376 struct sockcm_cookie sockc_junk;
377 struct ipcm6_cookie ipc6;
378
379 err = -ENOMEM;
380 fl->opt = kmalloc(sizeof(*fl->opt) + olen, GFP_KERNEL);
381 if (!fl->opt)
382 goto done;
383
384 memset(fl->opt, 0, sizeof(*fl->opt));
385 fl->opt->tot_len = sizeof(*fl->opt) + olen;
386 err = -EFAULT;
387 if (copy_from_user(fl->opt+1, optval+CMSG_ALIGN(sizeof(*freq)), olen))
388 goto done;
389
390 msg.msg_controllen = olen;
391 msg.msg_control = (void *)(fl->opt+1);
392 memset(&flowi6, 0, sizeof(flowi6));
393
394 ipc6.opt = fl->opt;
395 err = ip6_datagram_send_ctl(net, sk, &msg, &flowi6, &ipc6, &sockc_junk);
396 if (err)
397 goto done;
398 err = -EINVAL;
399 if (fl->opt->opt_flen)
400 goto done;
401 if (fl->opt->opt_nflen == 0) {
402 kfree(fl->opt);
403 fl->opt = NULL;
404 }
405 }
406
407 fl->fl_net = net;
408 fl->expires = jiffies;
409 err = fl6_renew(fl, freq->flr_linger, freq->flr_expires);
410 if (err)
411 goto done;
412 fl->share = freq->flr_share;
413 addr_type = ipv6_addr_type(&freq->flr_dst);
414 if ((addr_type & IPV6_ADDR_MAPPED) ||
415 addr_type == IPV6_ADDR_ANY) {
416 err = -EINVAL;
417 goto done;
418 }
419 fl->dst = freq->flr_dst;
420 atomic_set(&fl->users, 1);
421 switch (fl->share) {
422 case IPV6_FL_S_EXCL:
423 case IPV6_FL_S_ANY:
424 break;
425 case IPV6_FL_S_PROCESS:
426 fl->owner.pid = get_task_pid(current, PIDTYPE_PID);
427 break;
428 case IPV6_FL_S_USER:
429 fl->owner.uid = current_euid();
430 break;
431 default:
432 err = -EINVAL;
433 goto done;
434 }
435 return fl;
436
437 done:
438 fl_free(fl);
439 *err_p = err;
440 return NULL;
441 }
442
443 static int mem_check(struct sock *sk)
444 {
445 struct ipv6_pinfo *np = inet6_sk(sk);
446 struct ipv6_fl_socklist *sfl;
447 int room = FL_MAX_SIZE - atomic_read(&fl_size);
448 int count = 0;
449
450 if (room > FL_MAX_SIZE - FL_MAX_PER_SOCK)
451 return 0;
452
453 rcu_read_lock_bh();
454 for_each_sk_fl_rcu(np, sfl)
455 count++;
456 rcu_read_unlock_bh();
457
458 if (room <= 0 ||
459 ((count >= FL_MAX_PER_SOCK ||
460 (count > 0 && room < FL_MAX_SIZE/2) || room < FL_MAX_SIZE/4) &&
461 !capable(CAP_NET_ADMIN)))
462 return -ENOBUFS;
463
464 return 0;
465 }
466
467 static inline void fl_link(struct ipv6_pinfo *np, struct ipv6_fl_socklist *sfl,
468 struct ip6_flowlabel *fl)
469 {
470 spin_lock_bh(&ip6_sk_fl_lock);
471 sfl->fl = fl;
472 sfl->next = np->ipv6_fl_list;
473 rcu_assign_pointer(np->ipv6_fl_list, sfl);
474 spin_unlock_bh(&ip6_sk_fl_lock);
475 }
476
477 int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
478 int flags)
479 {
480 struct ipv6_pinfo *np = inet6_sk(sk);
481 struct ipv6_fl_socklist *sfl;
482
483 if (flags & IPV6_FL_F_REMOTE) {
484 freq->flr_label = np->rcv_flowinfo & IPV6_FLOWLABEL_MASK;
485 return 0;
486 }
487
488 if (np->repflow) {
489 freq->flr_label = np->flow_label;
490 return 0;
491 }
492
493 rcu_read_lock_bh();
494
495 for_each_sk_fl_rcu(np, sfl) {
496 if (sfl->fl->label == (np->flow_label & IPV6_FLOWLABEL_MASK)) {
497 spin_lock_bh(&ip6_fl_lock);
498 freq->flr_label = sfl->fl->label;
499 freq->flr_dst = sfl->fl->dst;
500 freq->flr_share = sfl->fl->share;
501 freq->flr_expires = (sfl->fl->expires - jiffies) / HZ;
502 freq->flr_linger = sfl->fl->linger / HZ;
503
504 spin_unlock_bh(&ip6_fl_lock);
505 rcu_read_unlock_bh();
506 return 0;
507 }
508 }
509 rcu_read_unlock_bh();
510
511 return -ENOENT;
512 }
513
514 int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen)
515 {
516 int uninitialized_var(err);
517 struct net *net = sock_net(sk);
518 struct ipv6_pinfo *np = inet6_sk(sk);
519 struct in6_flowlabel_req freq;
520 struct ipv6_fl_socklist *sfl1 = NULL;
521 struct ipv6_fl_socklist *sfl;
522 struct ipv6_fl_socklist __rcu **sflp;
523 struct ip6_flowlabel *fl, *fl1 = NULL;
524
525
526 if (optlen < sizeof(freq))
527 return -EINVAL;
528
529 if (copy_from_user(&freq, optval, sizeof(freq)))
530 return -EFAULT;
531
532 switch (freq.flr_action) {
533 case IPV6_FL_A_PUT:
534 if (freq.flr_flags & IPV6_FL_F_REFLECT) {
535 if (sk->sk_protocol != IPPROTO_TCP)
536 return -ENOPROTOOPT;
537 if (!np->repflow)
538 return -ESRCH;
539 np->flow_label = 0;
540 np->repflow = 0;
541 return 0;
542 }
543 spin_lock_bh(&ip6_sk_fl_lock);
544 for (sflp = &np->ipv6_fl_list;
545 (sfl = rcu_dereference_protected(*sflp,
546 lockdep_is_held(&ip6_sk_fl_lock))) != NULL;
547 sflp = &sfl->next) {
548 if (sfl->fl->label == freq.flr_label) {
549 if (freq.flr_label == (np->flow_label&IPV6_FLOWLABEL_MASK))
550 np->flow_label &= ~IPV6_FLOWLABEL_MASK;
551 *sflp = sfl->next;
552 spin_unlock_bh(&ip6_sk_fl_lock);
553 fl_release(sfl->fl);
554 kfree_rcu(sfl, rcu);
555 return 0;
556 }
557 }
558 spin_unlock_bh(&ip6_sk_fl_lock);
559 return -ESRCH;
560
561 case IPV6_FL_A_RENEW:
562 rcu_read_lock_bh();
563 for_each_sk_fl_rcu(np, sfl) {
564 if (sfl->fl->label == freq.flr_label) {
565 err = fl6_renew(sfl->fl, freq.flr_linger, freq.flr_expires);
566 rcu_read_unlock_bh();
567 return err;
568 }
569 }
570 rcu_read_unlock_bh();
571
572 if (freq.flr_share == IPV6_FL_S_NONE &&
573 ns_capable(net->user_ns, CAP_NET_ADMIN)) {
574 fl = fl_lookup(net, freq.flr_label);
575 if (fl) {
576 err = fl6_renew(fl, freq.flr_linger, freq.flr_expires);
577 fl_release(fl);
578 return err;
579 }
580 }
581 return -ESRCH;
582
583 case IPV6_FL_A_GET:
584 if (freq.flr_flags & IPV6_FL_F_REFLECT) {
585 struct net *net = sock_net(sk);
586 if (net->ipv6.sysctl.flowlabel_consistency) {
587 net_info_ratelimited("Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable\n");
588 return -EPERM;
589 }
590
591 if (sk->sk_protocol != IPPROTO_TCP)
592 return -ENOPROTOOPT;
593
594 np->repflow = 1;
595 return 0;
596 }
597
598 if (freq.flr_label & ~IPV6_FLOWLABEL_MASK)
599 return -EINVAL;
600
601 if (net->ipv6.sysctl.flowlabel_state_ranges &&
602 (freq.flr_label & IPV6_FLOWLABEL_STATELESS_FLAG))
603 return -ERANGE;
604
605 fl = fl_create(net, sk, &freq, optval, optlen, &err);
606 if (!fl)
607 return err;
608 sfl1 = kmalloc(sizeof(*sfl1), GFP_KERNEL);
609
610 if (freq.flr_label) {
611 err = -EEXIST;
612 rcu_read_lock_bh();
613 for_each_sk_fl_rcu(np, sfl) {
614 if (sfl->fl->label == freq.flr_label) {
615 if (freq.flr_flags&IPV6_FL_F_EXCL) {
616 rcu_read_unlock_bh();
617 goto done;
618 }
619 fl1 = sfl->fl;
620 atomic_inc(&fl1->users);
621 break;
622 }
623 }
624 rcu_read_unlock_bh();
625
626 if (!fl1)
627 fl1 = fl_lookup(net, freq.flr_label);
628 if (fl1) {
629 recheck:
630 err = -EEXIST;
631 if (freq.flr_flags&IPV6_FL_F_EXCL)
632 goto release;
633 err = -EPERM;
634 if (fl1->share == IPV6_FL_S_EXCL ||
635 fl1->share != fl->share ||
636 ((fl1->share == IPV6_FL_S_PROCESS) &&
637 (fl1->owner.pid == fl->owner.pid)) ||
638 ((fl1->share == IPV6_FL_S_USER) &&
639 uid_eq(fl1->owner.uid, fl->owner.uid)))
640 goto release;
641
642 err = -ENOMEM;
643 if (!sfl1)
644 goto release;
645 if (fl->linger > fl1->linger)
646 fl1->linger = fl->linger;
647 if ((long)(fl->expires - fl1->expires) > 0)
648 fl1->expires = fl->expires;
649 fl_link(np, sfl1, fl1);
650 fl_free(fl);
651 return 0;
652
653 release:
654 fl_release(fl1);
655 goto done;
656 }
657 }
658 err = -ENOENT;
659 if (!(freq.flr_flags&IPV6_FL_F_CREATE))
660 goto done;
661
662 err = -ENOMEM;
663 if (!sfl1)
664 goto done;
665
666 err = mem_check(sk);
667 if (err != 0)
668 goto done;
669
670 fl1 = fl_intern(net, fl, freq.flr_label);
671 if (fl1)
672 goto recheck;
673
674 if (!freq.flr_label) {
675 if (copy_to_user(&((struct in6_flowlabel_req __user *) optval)->flr_label,
676 &fl->label, sizeof(fl->label))) {
677 /* Intentionally ignore fault. */
678 }
679 }
680
681 fl_link(np, sfl1, fl);
682 return 0;
683
684 default:
685 return -EINVAL;
686 }
687
688 done:
689 fl_free(fl);
690 kfree(sfl1);
691 return err;
692 }
693
694 #ifdef CONFIG_PROC_FS
695
696 struct ip6fl_iter_state {
697 struct seq_net_private p;
698 struct pid_namespace *pid_ns;
699 int bucket;
700 };
701
702 #define ip6fl_seq_private(seq) ((struct ip6fl_iter_state *)(seq)->private)
703
704 static struct ip6_flowlabel *ip6fl_get_first(struct seq_file *seq)
705 {
706 struct ip6_flowlabel *fl = NULL;
707 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
708 struct net *net = seq_file_net(seq);
709
710 for (state->bucket = 0; state->bucket <= FL_HASH_MASK; ++state->bucket) {
711 for_each_fl_rcu(state->bucket, fl) {
712 if (net_eq(fl->fl_net, net))
713 goto out;
714 }
715 }
716 fl = NULL;
717 out:
718 return fl;
719 }
720
721 static struct ip6_flowlabel *ip6fl_get_next(struct seq_file *seq, struct ip6_flowlabel *fl)
722 {
723 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
724 struct net *net = seq_file_net(seq);
725
726 for_each_fl_continue_rcu(fl) {
727 if (net_eq(fl->fl_net, net))
728 goto out;
729 }
730
731 try_again:
732 if (++state->bucket <= FL_HASH_MASK) {
733 for_each_fl_rcu(state->bucket, fl) {
734 if (net_eq(fl->fl_net, net))
735 goto out;
736 }
737 goto try_again;
738 }
739 fl = NULL;
740
741 out:
742 return fl;
743 }
744
745 static struct ip6_flowlabel *ip6fl_get_idx(struct seq_file *seq, loff_t pos)
746 {
747 struct ip6_flowlabel *fl = ip6fl_get_first(seq);
748 if (fl)
749 while (pos && (fl = ip6fl_get_next(seq, fl)) != NULL)
750 --pos;
751 return pos ? NULL : fl;
752 }
753
754 static void *ip6fl_seq_start(struct seq_file *seq, loff_t *pos)
755 __acquires(RCU)
756 {
757 rcu_read_lock_bh();
758 return *pos ? ip6fl_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
759 }
760
761 static void *ip6fl_seq_next(struct seq_file *seq, void *v, loff_t *pos)
762 {
763 struct ip6_flowlabel *fl;
764
765 if (v == SEQ_START_TOKEN)
766 fl = ip6fl_get_first(seq);
767 else
768 fl = ip6fl_get_next(seq, v);
769 ++*pos;
770 return fl;
771 }
772
773 static void ip6fl_seq_stop(struct seq_file *seq, void *v)
774 __releases(RCU)
775 {
776 rcu_read_unlock_bh();
777 }
778
779 static int ip6fl_seq_show(struct seq_file *seq, void *v)
780 {
781 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
782 if (v == SEQ_START_TOKEN) {
783 seq_puts(seq, "Label S Owner Users Linger Expires Dst Opt\n");
784 } else {
785 struct ip6_flowlabel *fl = v;
786 seq_printf(seq,
787 "%05X %-1d %-6d %-6d %-6ld %-8ld %pi6 %-4d\n",
788 (unsigned int)ntohl(fl->label),
789 fl->share,
790 ((fl->share == IPV6_FL_S_PROCESS) ?
791 pid_nr_ns(fl->owner.pid, state->pid_ns) :
792 ((fl->share == IPV6_FL_S_USER) ?
793 from_kuid_munged(seq_user_ns(seq), fl->owner.uid) :
794 0)),
795 atomic_read(&fl->users),
796 fl->linger/HZ,
797 (long)(fl->expires - jiffies)/HZ,
798 &fl->dst,
799 fl->opt ? fl->opt->opt_nflen : 0);
800 }
801 return 0;
802 }
803
804 static const struct seq_operations ip6fl_seq_ops = {
805 .start = ip6fl_seq_start,
806 .next = ip6fl_seq_next,
807 .stop = ip6fl_seq_stop,
808 .show = ip6fl_seq_show,
809 };
810
811 static int ip6fl_seq_open(struct inode *inode, struct file *file)
812 {
813 struct seq_file *seq;
814 struct ip6fl_iter_state *state;
815 int err;
816
817 err = seq_open_net(inode, file, &ip6fl_seq_ops,
818 sizeof(struct ip6fl_iter_state));
819
820 if (!err) {
821 seq = file->private_data;
822 state = ip6fl_seq_private(seq);
823 rcu_read_lock();
824 state->pid_ns = get_pid_ns(task_active_pid_ns(current));
825 rcu_read_unlock();
826 }
827 return err;
828 }
829
830 static int ip6fl_seq_release(struct inode *inode, struct file *file)
831 {
832 struct seq_file *seq = file->private_data;
833 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
834 put_pid_ns(state->pid_ns);
835 return seq_release_net(inode, file);
836 }
837
838 static const struct file_operations ip6fl_seq_fops = {
839 .owner = THIS_MODULE,
840 .open = ip6fl_seq_open,
841 .read = seq_read,
842 .llseek = seq_lseek,
843 .release = ip6fl_seq_release,
844 };
845
846 static int __net_init ip6_flowlabel_proc_init(struct net *net)
847 {
848 if (!proc_create("ip6_flowlabel", S_IRUGO, net->proc_net,
849 &ip6fl_seq_fops))
850 return -ENOMEM;
851 return 0;
852 }
853
854 static void __net_exit ip6_flowlabel_proc_fini(struct net *net)
855 {
856 remove_proc_entry("ip6_flowlabel", net->proc_net);
857 }
858 #else
859 static inline int ip6_flowlabel_proc_init(struct net *net)
860 {
861 return 0;
862 }
863 static inline void ip6_flowlabel_proc_fini(struct net *net)
864 {
865 }
866 #endif
867
868 static void __net_exit ip6_flowlabel_net_exit(struct net *net)
869 {
870 ip6_fl_purge(net);
871 ip6_flowlabel_proc_fini(net);
872 }
873
874 static struct pernet_operations ip6_flowlabel_net_ops = {
875 .init = ip6_flowlabel_proc_init,
876 .exit = ip6_flowlabel_net_exit,
877 };
878
879 int ip6_flowlabel_init(void)
880 {
881 return register_pernet_subsys(&ip6_flowlabel_net_ops);
882 }
883
884 void ip6_flowlabel_cleanup(void)
885 {
886 del_timer(&ip6_fl_gc_timer);
887 unregister_pernet_subsys(&ip6_flowlabel_net_ops);
888 }
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