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Linux 3.17-rc2
[linux/fpc-iii.git] / net / ipv6 / ip6_flowlabel.c
blob4052694c6f2cb196b54ef7d5235d61d74e4ea69c
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 <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 */
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(unsigned long dummy);
50 static DEFINE_TIMER(ip6_fl_gc_timer, ip6_fl_gc, 0, 0);
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 release_net(fl->fl_net);
104 kfree(fl->opt);
105 kfree_rcu(fl, rcu);
106 }
107 }
108
109 static void fl_release(struct ip6_flowlabel *fl)
110 {
111 spin_lock_bh(&ip6_fl_lock);
112
113 fl->lastuse = jiffies;
114 if (atomic_dec_and_test(&fl->users)) {
115 unsigned long ttd = fl->lastuse + fl->linger;
116 if (time_after(ttd, fl->expires))
117 fl->expires = ttd;
118 ttd = fl->expires;
119 if (fl->opt && fl->share == IPV6_FL_S_EXCL) {
120 struct ipv6_txoptions *opt = fl->opt;
121 fl->opt = NULL;
122 kfree(opt);
123 }
124 if (!timer_pending(&ip6_fl_gc_timer) ||
125 time_after(ip6_fl_gc_timer.expires, ttd))
126 mod_timer(&ip6_fl_gc_timer, ttd);
127 }
128 spin_unlock_bh(&ip6_fl_lock);
129 }
130
131 static void ip6_fl_gc(unsigned long dummy)
132 {
133 int i;
134 unsigned long now = jiffies;
135 unsigned long sched = 0;
136
137 spin_lock(&ip6_fl_lock);
138
139 for (i=0; i<=FL_HASH_MASK; i++) {
140 struct ip6_flowlabel *fl;
141 struct ip6_flowlabel __rcu **flp;
142
143 flp = &fl_ht[i];
144 while ((fl = rcu_dereference_protected(*flp,
145 lockdep_is_held(&ip6_fl_lock))) != NULL) {
146 if (atomic_read(&fl->users) == 0) {
147 unsigned long ttd = fl->lastuse + fl->linger;
148 if (time_after(ttd, fl->expires))
149 fl->expires = ttd;
150 ttd = fl->expires;
151 if (time_after_eq(now, ttd)) {
152 *flp = fl->next;
153 fl_free(fl);
154 atomic_dec(&fl_size);
155 continue;
156 }
157 if (!sched || time_before(ttd, sched))
158 sched = ttd;
159 }
160 flp = &fl->next;
161 }
162 }
163 if (!sched && atomic_read(&fl_size))
164 sched = now + FL_MAX_LINGER;
165 if (sched) {
166 mod_timer(&ip6_fl_gc_timer, sched);
167 }
168 spin_unlock(&ip6_fl_lock);
169 }
170
171 static void __net_exit ip6_fl_purge(struct net *net)
172 {
173 int i;
174
175 spin_lock(&ip6_fl_lock);
176 for (i = 0; i <= FL_HASH_MASK; i++) {
177 struct ip6_flowlabel *fl;
178 struct ip6_flowlabel __rcu **flp;
179
180 flp = &fl_ht[i];
181 while ((fl = rcu_dereference_protected(*flp,
182 lockdep_is_held(&ip6_fl_lock))) != NULL) {
183 if (net_eq(fl->fl_net, net) &&
184 atomic_read(&fl->users) == 0) {
185 *flp = fl->next;
186 fl_free(fl);
187 atomic_dec(&fl_size);
188 continue;
189 }
190 flp = &fl->next;
191 }
192 }
193 spin_unlock(&ip6_fl_lock);
194 }
195
196 static struct ip6_flowlabel *fl_intern(struct net *net,
197 struct ip6_flowlabel *fl, __be32 label)
198 {
199 struct ip6_flowlabel *lfl;
200
201 fl->label = label & IPV6_FLOWLABEL_MASK;
202
203 spin_lock_bh(&ip6_fl_lock);
204 if (label == 0) {
205 for (;;) {
206 fl->label = htonl(prandom_u32())&IPV6_FLOWLABEL_MASK;
207 if (fl->label) {
208 lfl = __fl_lookup(net, fl->label);
209 if (lfl == NULL)
210 break;
211 }
212 }
213 } else {
214 /*
215 * we dropper the ip6_fl_lock, so this entry could reappear
216 * and we need to recheck with it.
217 *
218 * OTOH no need to search the active socket first, like it is
219 * done in ipv6_flowlabel_opt - sock is locked, so new entry
220 * with the same label can only appear on another sock
221 */
222 lfl = __fl_lookup(net, fl->label);
223 if (lfl != NULL) {
224 atomic_inc(&lfl->users);
225 spin_unlock_bh(&ip6_fl_lock);
226 return lfl;
227 }
228 }
229
230 fl->lastuse = jiffies;
231 fl->next = fl_ht[FL_HASH(fl->label)];
232 rcu_assign_pointer(fl_ht[FL_HASH(fl->label)], fl);
233 atomic_inc(&fl_size);
234 spin_unlock_bh(&ip6_fl_lock);
235 return NULL;
236 }
237
238
239
240 /* Socket flowlabel lists */
241
242 struct ip6_flowlabel * fl6_sock_lookup(struct sock *sk, __be32 label)
243 {
244 struct ipv6_fl_socklist *sfl;
245 struct ipv6_pinfo *np = inet6_sk(sk);
246
247 label &= IPV6_FLOWLABEL_MASK;
248
249 rcu_read_lock_bh();
250 for_each_sk_fl_rcu(np, sfl) {
251 struct ip6_flowlabel *fl = sfl->fl;
252 if (fl->label == label) {
253 fl->lastuse = jiffies;
254 atomic_inc(&fl->users);
255 rcu_read_unlock_bh();
256 return fl;
257 }
258 }
259 rcu_read_unlock_bh();
260 return NULL;
261 }
262
263 EXPORT_SYMBOL_GPL(fl6_sock_lookup);
264
265 void fl6_free_socklist(struct sock *sk)
266 {
267 struct ipv6_pinfo *np = inet6_sk(sk);
268 struct ipv6_fl_socklist *sfl;
269
270 if (!rcu_access_pointer(np->ipv6_fl_list))
271 return;
272
273 spin_lock_bh(&ip6_sk_fl_lock);
274 while ((sfl = rcu_dereference_protected(np->ipv6_fl_list,
275 lockdep_is_held(&ip6_sk_fl_lock))) != NULL) {
276 np->ipv6_fl_list = sfl->next;
277 spin_unlock_bh(&ip6_sk_fl_lock);
278
279 fl_release(sfl->fl);
280 kfree_rcu(sfl, rcu);
281
282 spin_lock_bh(&ip6_sk_fl_lock);
283 }
284 spin_unlock_bh(&ip6_sk_fl_lock);
285 }
286
287 /* Service routines */
288
289
290 /*
291 It is the only difficult place. flowlabel enforces equal headers
292 before and including routing header, however user may supply options
293 following rthdr.
294 */
295
296 struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
297 struct ip6_flowlabel * fl,
298 struct ipv6_txoptions * fopt)
299 {
300 struct ipv6_txoptions * fl_opt = fl->opt;
301
302 if (fopt == NULL || fopt->opt_flen == 0)
303 return fl_opt;
304
305 if (fl_opt != NULL) {
306 opt_space->hopopt = fl_opt->hopopt;
307 opt_space->dst0opt = fl_opt->dst0opt;
308 opt_space->srcrt = fl_opt->srcrt;
309 opt_space->opt_nflen = fl_opt->opt_nflen;
310 } else {
311 if (fopt->opt_nflen == 0)
312 return fopt;
313 opt_space->hopopt = NULL;
314 opt_space->dst0opt = NULL;
315 opt_space->srcrt = NULL;
316 opt_space->opt_nflen = 0;
317 }
318 opt_space->dst1opt = fopt->dst1opt;
319 opt_space->opt_flen = fopt->opt_flen;
320 return opt_space;
321 }
322 EXPORT_SYMBOL_GPL(fl6_merge_options);
323
324 static unsigned long check_linger(unsigned long ttl)
325 {
326 if (ttl < FL_MIN_LINGER)
327 return FL_MIN_LINGER*HZ;
328 if (ttl > FL_MAX_LINGER && !capable(CAP_NET_ADMIN))
329 return 0;
330 return ttl*HZ;
331 }
332
333 static int fl6_renew(struct ip6_flowlabel *fl, unsigned long linger, unsigned long expires)
334 {
335 linger = check_linger(linger);
336 if (!linger)
337 return -EPERM;
338 expires = check_linger(expires);
339 if (!expires)
340 return -EPERM;
341
342 spin_lock_bh(&ip6_fl_lock);
343 fl->lastuse = jiffies;
344 if (time_before(fl->linger, linger))
345 fl->linger = linger;
346 if (time_before(expires, fl->linger))
347 expires = fl->linger;
348 if (time_before(fl->expires, fl->lastuse + expires))
349 fl->expires = fl->lastuse + expires;
350 spin_unlock_bh(&ip6_fl_lock);
351
352 return 0;
353 }
354
355 static struct ip6_flowlabel *
356 fl_create(struct net *net, struct sock *sk, struct in6_flowlabel_req *freq,
357 char __user *optval, int optlen, int *err_p)
358 {
359 struct ip6_flowlabel *fl = NULL;
360 int olen;
361 int addr_type;
362 int err;
363
364 olen = optlen - CMSG_ALIGN(sizeof(*freq));
365 err = -EINVAL;
366 if (olen > 64 * 1024)
367 goto done;
368
369 err = -ENOMEM;
370 fl = kzalloc(sizeof(*fl), GFP_KERNEL);
371 if (fl == NULL)
372 goto done;
373
374 if (olen > 0) {
375 struct msghdr msg;
376 struct flowi6 flowi6;
377 int junk;
378
379 err = -ENOMEM;
380 fl->opt = kmalloc(sizeof(*fl->opt) + olen, GFP_KERNEL);
381 if (fl->opt == NULL)
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 err = ip6_datagram_send_ctl(net, sk, &msg, &flowi6, fl->opt,
395 &junk, &junk, &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 = hold_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(*sflp))!=NULL;
546 sflp = &sfl->next) {
547 if (sfl->fl->label == freq.flr_label) {
548 if (freq.flr_label == (np->flow_label&IPV6_FLOWLABEL_MASK))
549 np->flow_label &= ~IPV6_FLOWLABEL_MASK;
550 *sflp = rcu_dereference(sfl->next);
551 spin_unlock_bh(&ip6_sk_fl_lock);
552 fl_release(sfl->fl);
553 kfree_rcu(sfl, rcu);
554 return 0;
555 }
556 }
557 spin_unlock_bh(&ip6_sk_fl_lock);
558 return -ESRCH;
559
560 case IPV6_FL_A_RENEW:
561 rcu_read_lock_bh();
562 for_each_sk_fl_rcu(np, sfl) {
563 if (sfl->fl->label == freq.flr_label) {
564 err = fl6_renew(sfl->fl, freq.flr_linger, freq.flr_expires);
565 rcu_read_unlock_bh();
566 return err;
567 }
568 }
569 rcu_read_unlock_bh();
570
571 if (freq.flr_share == IPV6_FL_S_NONE &&
572 ns_capable(net->user_ns, CAP_NET_ADMIN)) {
573 fl = fl_lookup(net, freq.flr_label);
574 if (fl) {
575 err = fl6_renew(fl, freq.flr_linger, freq.flr_expires);
576 fl_release(fl);
577 return err;
578 }
579 }
580 return -ESRCH;
581
582 case IPV6_FL_A_GET:
583 if (freq.flr_flags & IPV6_FL_F_REFLECT) {
584 struct net *net = sock_net(sk);
585 if (net->ipv6.sysctl.flowlabel_consistency) {
586 net_info_ratelimited("Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable\n");
587 return -EPERM;
588 }
589
590 if (sk->sk_protocol != IPPROTO_TCP)
591 return -ENOPROTOOPT;
592
593 np->repflow = 1;
594 return 0;
595 }
596
597 if (freq.flr_label & ~IPV6_FLOWLABEL_MASK)
598 return -EINVAL;
599
600 fl = fl_create(net, sk, &freq, optval, optlen, &err);
601 if (fl == NULL)
602 return err;
603 sfl1 = kmalloc(sizeof(*sfl1), GFP_KERNEL);
604
605 if (freq.flr_label) {
606 err = -EEXIST;
607 rcu_read_lock_bh();
608 for_each_sk_fl_rcu(np, sfl) {
609 if (sfl->fl->label == freq.flr_label) {
610 if (freq.flr_flags&IPV6_FL_F_EXCL) {
611 rcu_read_unlock_bh();
612 goto done;
613 }
614 fl1 = sfl->fl;
615 atomic_inc(&fl1->users);
616 break;
617 }
618 }
619 rcu_read_unlock_bh();
620
621 if (fl1 == NULL)
622 fl1 = fl_lookup(net, freq.flr_label);
623 if (fl1) {
624 recheck:
625 err = -EEXIST;
626 if (freq.flr_flags&IPV6_FL_F_EXCL)
627 goto release;
628 err = -EPERM;
629 if (fl1->share == IPV6_FL_S_EXCL ||
630 fl1->share != fl->share ||
631 ((fl1->share == IPV6_FL_S_PROCESS) &&
632 (fl1->owner.pid == fl->owner.pid)) ||
633 ((fl1->share == IPV6_FL_S_USER) &&
634 uid_eq(fl1->owner.uid, fl->owner.uid)))
635 goto release;
636
637 err = -ENOMEM;
638 if (sfl1 == NULL)
639 goto release;
640 if (fl->linger > fl1->linger)
641 fl1->linger = fl->linger;
642 if ((long)(fl->expires - fl1->expires) > 0)
643 fl1->expires = fl->expires;
644 fl_link(np, sfl1, fl1);
645 fl_free(fl);
646 return 0;
647
648 release:
649 fl_release(fl1);
650 goto done;
651 }
652 }
653 err = -ENOENT;
654 if (!(freq.flr_flags&IPV6_FL_F_CREATE))
655 goto done;
656
657 err = -ENOMEM;
658 if (sfl1 == NULL || (err = mem_check(sk)) != 0)
659 goto done;
660
661 fl1 = fl_intern(net, fl, freq.flr_label);
662 if (fl1 != NULL)
663 goto recheck;
664
665 if (!freq.flr_label) {
666 if (copy_to_user(&((struct in6_flowlabel_req __user *) optval)->flr_label,
667 &fl->label, sizeof(fl->label))) {
668 /* Intentionally ignore fault. */
669 }
670 }
671
672 fl_link(np, sfl1, fl);
673 return 0;
674
675 default:
676 return -EINVAL;
677 }
678
679 done:
680 fl_free(fl);
681 kfree(sfl1);
682 return err;
683 }
684
685 #ifdef CONFIG_PROC_FS
686
687 struct ip6fl_iter_state {
688 struct seq_net_private p;
689 struct pid_namespace *pid_ns;
690 int bucket;
691 };
692
693 #define ip6fl_seq_private(seq) ((struct ip6fl_iter_state *)(seq)->private)
694
695 static struct ip6_flowlabel *ip6fl_get_first(struct seq_file *seq)
696 {
697 struct ip6_flowlabel *fl = NULL;
698 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
699 struct net *net = seq_file_net(seq);
700
701 for (state->bucket = 0; state->bucket <= FL_HASH_MASK; ++state->bucket) {
702 for_each_fl_rcu(state->bucket, fl) {
703 if (net_eq(fl->fl_net, net))
704 goto out;
705 }
706 }
707 fl = NULL;
708 out:
709 return fl;
710 }
711
712 static struct ip6_flowlabel *ip6fl_get_next(struct seq_file *seq, struct ip6_flowlabel *fl)
713 {
714 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
715 struct net *net = seq_file_net(seq);
716
717 for_each_fl_continue_rcu(fl) {
718 if (net_eq(fl->fl_net, net))
719 goto out;
720 }
721
722 try_again:
723 if (++state->bucket <= FL_HASH_MASK) {
724 for_each_fl_rcu(state->bucket, fl) {
725 if (net_eq(fl->fl_net, net))
726 goto out;
727 }
728 goto try_again;
729 }
730 fl = NULL;
731
732 out:
733 return fl;
734 }
735
736 static struct ip6_flowlabel *ip6fl_get_idx(struct seq_file *seq, loff_t pos)
737 {
738 struct ip6_flowlabel *fl = ip6fl_get_first(seq);
739 if (fl)
740 while (pos && (fl = ip6fl_get_next(seq, fl)) != NULL)
741 --pos;
742 return pos ? NULL : fl;
743 }
744
745 static void *ip6fl_seq_start(struct seq_file *seq, loff_t *pos)
746 __acquires(RCU)
747 {
748 rcu_read_lock_bh();
749 return *pos ? ip6fl_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
750 }
751
752 static void *ip6fl_seq_next(struct seq_file *seq, void *v, loff_t *pos)
753 {
754 struct ip6_flowlabel *fl;
755
756 if (v == SEQ_START_TOKEN)
757 fl = ip6fl_get_first(seq);
758 else
759 fl = ip6fl_get_next(seq, v);
760 ++*pos;
761 return fl;
762 }
763
764 static void ip6fl_seq_stop(struct seq_file *seq, void *v)
765 __releases(RCU)
766 {
767 rcu_read_unlock_bh();
768 }
769
770 static int ip6fl_seq_show(struct seq_file *seq, void *v)
771 {
772 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
773 if (v == SEQ_START_TOKEN)
774 seq_printf(seq, "%-5s %-1s %-6s %-6s %-6s %-8s %-32s %s\n",
775 "Label", "S", "Owner", "Users", "Linger", "Expires", "Dst", "Opt");
776 else {
777 struct ip6_flowlabel *fl = v;
778 seq_printf(seq,
779 "%05X %-1d %-6d %-6d %-6ld %-8ld %pi6 %-4d\n",
780 (unsigned int)ntohl(fl->label),
781 fl->share,
782 ((fl->share == IPV6_FL_S_PROCESS) ?
783 pid_nr_ns(fl->owner.pid, state->pid_ns) :
784 ((fl->share == IPV6_FL_S_USER) ?
785 from_kuid_munged(seq_user_ns(seq), fl->owner.uid) :
786 0)),
787 atomic_read(&fl->users),
788 fl->linger/HZ,
789 (long)(fl->expires - jiffies)/HZ,
790 &fl->dst,
791 fl->opt ? fl->opt->opt_nflen : 0);
792 }
793 return 0;
794 }
795
796 static const struct seq_operations ip6fl_seq_ops = {
797 .start = ip6fl_seq_start,
798 .next = ip6fl_seq_next,
799 .stop = ip6fl_seq_stop,
800 .show = ip6fl_seq_show,
801 };
802
803 static int ip6fl_seq_open(struct inode *inode, struct file *file)
804 {
805 struct seq_file *seq;
806 struct ip6fl_iter_state *state;
807 int err;
808
809 err = seq_open_net(inode, file, &ip6fl_seq_ops,
810 sizeof(struct ip6fl_iter_state));
811
812 if (!err) {
813 seq = file->private_data;
814 state = ip6fl_seq_private(seq);
815 rcu_read_lock();
816 state->pid_ns = get_pid_ns(task_active_pid_ns(current));
817 rcu_read_unlock();
818 }
819 return err;
820 }
821
822 static int ip6fl_seq_release(struct inode *inode, struct file *file)
823 {
824 struct seq_file *seq = file->private_data;
825 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
826 put_pid_ns(state->pid_ns);
827 return seq_release_net(inode, file);
828 }
829
830 static const struct file_operations ip6fl_seq_fops = {
831 .owner = THIS_MODULE,
832 .open = ip6fl_seq_open,
833 .read = seq_read,
834 .llseek = seq_lseek,
835 .release = ip6fl_seq_release,
836 };
837
838 static int __net_init ip6_flowlabel_proc_init(struct net *net)
839 {
840 if (!proc_create("ip6_flowlabel", S_IRUGO, net->proc_net,
841 &ip6fl_seq_fops))
842 return -ENOMEM;
843 return 0;
844 }
845
846 static void __net_exit ip6_flowlabel_proc_fini(struct net *net)
847 {
848 remove_proc_entry("ip6_flowlabel", net->proc_net);
849 }
850 #else
851 static inline int ip6_flowlabel_proc_init(struct net *net)
852 {
853 return 0;
854 }
855 static inline void ip6_flowlabel_proc_fini(struct net *net)
856 {
857 }
858 #endif
859
860 static void __net_exit ip6_flowlabel_net_exit(struct net *net)
861 {
862 ip6_fl_purge(net);
863 ip6_flowlabel_proc_fini(net);
864 }
865
866 static struct pernet_operations ip6_flowlabel_net_ops = {
867 .init = ip6_flowlabel_proc_init,
868 .exit = ip6_flowlabel_net_exit,
869 };
870
871 int ip6_flowlabel_init(void)
872 {
873 return register_pernet_subsys(&ip6_flowlabel_net_ops);
874 }
875
876 void ip6_flowlabel_cleanup(void)
877 {
878 del_timer(&ip6_fl_gc_timer);
879 unregister_pernet_subsys(&ip6_flowlabel_net_ops);
880 }
Linux with added FPC-III support