?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Merge tag 'v3.3.7' into 3.3/master
[zen-stable.git] / net / ipv6 / ip6_flowlabel.c
blobb7867a1215b1758a8b99b4f3261519f991a8986d
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
26 #include <net/net_namespace.h>
27 #include <net/sock.h>
28
29 #include <net/ipv6.h>
30 #include <net/ndisc.h>
31 #include <net/protocol.h>
32 #include <net/ip6_route.h>
33 #include <net/addrconf.h>
34 #include <net/rawv6.h>
35 #include <net/icmp.h>
36 #include <net/transp_v6.h>
37
38 #include <asm/uaccess.h>
39
40 #define FL_MIN_LINGER 6 /* Minimal linger. It is set to 6sec specified
41 in old IPv6 RFC. Well, it was reasonable value.
42 */
43 #define FL_MAX_LINGER 60 /* Maximal linger timeout */
44
45 /* FL hash table */
46
47 #define FL_MAX_PER_SOCK 32
48 #define FL_MAX_SIZE 4096
49 #define FL_HASH_MASK 255
50 #define FL_HASH(l) (ntohl(l)&FL_HASH_MASK)
51
52 static atomic_t fl_size = ATOMIC_INIT(0);
53 static struct ip6_flowlabel *fl_ht[FL_HASH_MASK+1];
54
55 static void ip6_fl_gc(unsigned long dummy);
56 static DEFINE_TIMER(ip6_fl_gc_timer, ip6_fl_gc, 0, 0);
57
58 /* FL hash table lock: it protects only of GC */
59
60 static DEFINE_RWLOCK(ip6_fl_lock);
61
62 /* Big socket sock */
63
64 static DEFINE_RWLOCK(ip6_sk_fl_lock);
65
66
67 static inline struct ip6_flowlabel *__fl_lookup(struct net *net, __be32 label)
68 {
69 struct ip6_flowlabel *fl;
70
71 for (fl=fl_ht[FL_HASH(label)]; fl; fl = fl->next) {
72 if (fl->label == label && net_eq(fl->fl_net, net))
73 return fl;
74 }
75 return NULL;
76 }
77
78 static struct ip6_flowlabel *fl_lookup(struct net *net, __be32 label)
79 {
80 struct ip6_flowlabel *fl;
81
82 read_lock_bh(&ip6_fl_lock);
83 fl = __fl_lookup(net, label);
84 if (fl)
85 atomic_inc(&fl->users);
86 read_unlock_bh(&ip6_fl_lock);
87 return fl;
88 }
89
90
91 static void fl_free(struct ip6_flowlabel *fl)
92 {
93 if (fl) {
94 release_net(fl->fl_net);
95 kfree(fl->opt);
96 }
97 kfree(fl);
98 }
99
100 static void fl_release(struct ip6_flowlabel *fl)
101 {
102 write_lock_bh(&ip6_fl_lock);
103
104 fl->lastuse = jiffies;
105 if (atomic_dec_and_test(&fl->users)) {
106 unsigned long ttd = fl->lastuse + fl->linger;
107 if (time_after(ttd, fl->expires))
108 fl->expires = ttd;
109 ttd = fl->expires;
110 if (fl->opt && fl->share == IPV6_FL_S_EXCL) {
111 struct ipv6_txoptions *opt = fl->opt;
112 fl->opt = NULL;
113 kfree(opt);
114 }
115 if (!timer_pending(&ip6_fl_gc_timer) ||
116 time_after(ip6_fl_gc_timer.expires, ttd))
117 mod_timer(&ip6_fl_gc_timer, ttd);
118 }
119 write_unlock_bh(&ip6_fl_lock);
120 }
121
122 static void ip6_fl_gc(unsigned long dummy)
123 {
124 int i;
125 unsigned long now = jiffies;
126 unsigned long sched = 0;
127
128 write_lock(&ip6_fl_lock);
129
130 for (i=0; i<=FL_HASH_MASK; i++) {
131 struct ip6_flowlabel *fl, **flp;
132 flp = &fl_ht[i];
133 while ((fl=*flp) != NULL) {
134 if (atomic_read(&fl->users) == 0) {
135 unsigned long ttd = fl->lastuse + fl->linger;
136 if (time_after(ttd, fl->expires))
137 fl->expires = ttd;
138 ttd = fl->expires;
139 if (time_after_eq(now, ttd)) {
140 *flp = fl->next;
141 fl_free(fl);
142 atomic_dec(&fl_size);
143 continue;
144 }
145 if (!sched || time_before(ttd, sched))
146 sched = ttd;
147 }
148 flp = &fl->next;
149 }
150 }
151 if (!sched && atomic_read(&fl_size))
152 sched = now + FL_MAX_LINGER;
153 if (sched) {
154 mod_timer(&ip6_fl_gc_timer, sched);
155 }
156 write_unlock(&ip6_fl_lock);
157 }
158
159 static void __net_exit ip6_fl_purge(struct net *net)
160 {
161 int i;
162
163 write_lock(&ip6_fl_lock);
164 for (i = 0; i <= FL_HASH_MASK; i++) {
165 struct ip6_flowlabel *fl, **flp;
166 flp = &fl_ht[i];
167 while ((fl = *flp) != NULL) {
168 if (net_eq(fl->fl_net, net) &&
169 atomic_read(&fl->users) == 0) {
170 *flp = fl->next;
171 fl_free(fl);
172 atomic_dec(&fl_size);
173 continue;
174 }
175 flp = &fl->next;
176 }
177 }
178 write_unlock(&ip6_fl_lock);
179 }
180
181 static struct ip6_flowlabel *fl_intern(struct net *net,
182 struct ip6_flowlabel *fl, __be32 label)
183 {
184 struct ip6_flowlabel *lfl;
185
186 fl->label = label & IPV6_FLOWLABEL_MASK;
187
188 write_lock_bh(&ip6_fl_lock);
189 if (label == 0) {
190 for (;;) {
191 fl->label = htonl(net_random())&IPV6_FLOWLABEL_MASK;
192 if (fl->label) {
193 lfl = __fl_lookup(net, fl->label);
194 if (lfl == NULL)
195 break;
196 }
197 }
198 } else {
199 /*
200 * we dropper the ip6_fl_lock, so this entry could reappear
201 * and we need to recheck with it.
202 *
203 * OTOH no need to search the active socket first, like it is
204 * done in ipv6_flowlabel_opt - sock is locked, so new entry
205 * with the same label can only appear on another sock
206 */
207 lfl = __fl_lookup(net, fl->label);
208 if (lfl != NULL) {
209 atomic_inc(&lfl->users);
210 write_unlock_bh(&ip6_fl_lock);
211 return lfl;
212 }
213 }
214
215 fl->lastuse = jiffies;
216 fl->next = fl_ht[FL_HASH(fl->label)];
217 fl_ht[FL_HASH(fl->label)] = fl;
218 atomic_inc(&fl_size);
219 write_unlock_bh(&ip6_fl_lock);
220 return NULL;
221 }
222
223
224
225 /* Socket flowlabel lists */
226
227 struct ip6_flowlabel * fl6_sock_lookup(struct sock *sk, __be32 label)
228 {
229 struct ipv6_fl_socklist *sfl;
230 struct ipv6_pinfo *np = inet6_sk(sk);
231
232 label &= IPV6_FLOWLABEL_MASK;
233
234 read_lock_bh(&ip6_sk_fl_lock);
235 for (sfl=np->ipv6_fl_list; sfl; sfl = sfl->next) {
236 struct ip6_flowlabel *fl = sfl->fl;
237 if (fl->label == label) {
238 fl->lastuse = jiffies;
239 atomic_inc(&fl->users);
240 read_unlock_bh(&ip6_sk_fl_lock);
241 return fl;
242 }
243 }
244 read_unlock_bh(&ip6_sk_fl_lock);
245 return NULL;
246 }
247
248 EXPORT_SYMBOL_GPL(fl6_sock_lookup);
249
250 void fl6_free_socklist(struct sock *sk)
251 {
252 struct ipv6_pinfo *np = inet6_sk(sk);
253 struct ipv6_fl_socklist *sfl;
254
255 while ((sfl = np->ipv6_fl_list) != NULL) {
256 np->ipv6_fl_list = sfl->next;
257 fl_release(sfl->fl);
258 kfree(sfl);
259 }
260 }
261
262 /* Service routines */
263
264
265 /*
266 It is the only difficult place. flowlabel enforces equal headers
267 before and including routing header, however user may supply options
268 following rthdr.
269 */
270
271 struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
272 struct ip6_flowlabel * fl,
273 struct ipv6_txoptions * fopt)
274 {
275 struct ipv6_txoptions * fl_opt = fl->opt;
276
277 if (fopt == NULL || fopt->opt_flen == 0)
278 return fl_opt;
279
280 if (fl_opt != NULL) {
281 opt_space->hopopt = fl_opt->hopopt;
282 opt_space->dst0opt = fl_opt->dst0opt;
283 opt_space->srcrt = fl_opt->srcrt;
284 opt_space->opt_nflen = fl_opt->opt_nflen;
285 } else {
286 if (fopt->opt_nflen == 0)
287 return fopt;
288 opt_space->hopopt = NULL;
289 opt_space->dst0opt = NULL;
290 opt_space->srcrt = NULL;
291 opt_space->opt_nflen = 0;
292 }
293 opt_space->dst1opt = fopt->dst1opt;
294 opt_space->opt_flen = fopt->opt_flen;
295 return opt_space;
296 }
297
298 static unsigned long check_linger(unsigned long ttl)
299 {
300 if (ttl < FL_MIN_LINGER)
301 return FL_MIN_LINGER*HZ;
302 if (ttl > FL_MAX_LINGER && !capable(CAP_NET_ADMIN))
303 return 0;
304 return ttl*HZ;
305 }
306
307 static int fl6_renew(struct ip6_flowlabel *fl, unsigned long linger, unsigned long expires)
308 {
309 linger = check_linger(linger);
310 if (!linger)
311 return -EPERM;
312 expires = check_linger(expires);
313 if (!expires)
314 return -EPERM;
315 fl->lastuse = jiffies;
316 if (time_before(fl->linger, linger))
317 fl->linger = linger;
318 if (time_before(expires, fl->linger))
319 expires = fl->linger;
320 if (time_before(fl->expires, fl->lastuse + expires))
321 fl->expires = fl->lastuse + expires;
322 return 0;
323 }
324
325 static struct ip6_flowlabel *
326 fl_create(struct net *net, struct sock *sk, struct in6_flowlabel_req *freq,
327 char __user *optval, int optlen, int *err_p)
328 {
329 struct ip6_flowlabel *fl = NULL;
330 int olen;
331 int addr_type;
332 int err;
333
334 olen = optlen - CMSG_ALIGN(sizeof(*freq));
335 err = -EINVAL;
336 if (olen > 64 * 1024)
337 goto done;
338
339 err = -ENOMEM;
340 fl = kzalloc(sizeof(*fl), GFP_KERNEL);
341 if (fl == NULL)
342 goto done;
343
344 if (olen > 0) {
345 struct msghdr msg;
346 struct flowi6 flowi6;
347 int junk;
348
349 err = -ENOMEM;
350 fl->opt = kmalloc(sizeof(*fl->opt) + olen, GFP_KERNEL);
351 if (fl->opt == NULL)
352 goto done;
353
354 memset(fl->opt, 0, sizeof(*fl->opt));
355 fl->opt->tot_len = sizeof(*fl->opt) + olen;
356 err = -EFAULT;
357 if (copy_from_user(fl->opt+1, optval+CMSG_ALIGN(sizeof(*freq)), olen))
358 goto done;
359
360 msg.msg_controllen = olen;
361 msg.msg_control = (void*)(fl->opt+1);
362 memset(&flowi6, 0, sizeof(flowi6));
363
364 err = datagram_send_ctl(net, sk, &msg, &flowi6, fl->opt, &junk,
365 &junk, &junk);
366 if (err)
367 goto done;
368 err = -EINVAL;
369 if (fl->opt->opt_flen)
370 goto done;
371 if (fl->opt->opt_nflen == 0) {
372 kfree(fl->opt);
373 fl->opt = NULL;
374 }
375 }
376
377 fl->fl_net = hold_net(net);
378 fl->expires = jiffies;
379 err = fl6_renew(fl, freq->flr_linger, freq->flr_expires);
380 if (err)
381 goto done;
382 fl->share = freq->flr_share;
383 addr_type = ipv6_addr_type(&freq->flr_dst);
384 if ((addr_type & IPV6_ADDR_MAPPED) ||
385 addr_type == IPV6_ADDR_ANY) {
386 err = -EINVAL;
387 goto done;
388 }
389 fl->dst = freq->flr_dst;
390 atomic_set(&fl->users, 1);
391 switch (fl->share) {
392 case IPV6_FL_S_EXCL:
393 case IPV6_FL_S_ANY:
394 break;
395 case IPV6_FL_S_PROCESS:
396 fl->owner = current->pid;
397 break;
398 case IPV6_FL_S_USER:
399 fl->owner = current_euid();
400 break;
401 default:
402 err = -EINVAL;
403 goto done;
404 }
405 return fl;
406
407 done:
408 fl_free(fl);
409 *err_p = err;
410 return NULL;
411 }
412
413 static int mem_check(struct sock *sk)
414 {
415 struct ipv6_pinfo *np = inet6_sk(sk);
416 struct ipv6_fl_socklist *sfl;
417 int room = FL_MAX_SIZE - atomic_read(&fl_size);
418 int count = 0;
419
420 if (room > FL_MAX_SIZE - FL_MAX_PER_SOCK)
421 return 0;
422
423 for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next)
424 count++;
425
426 if (room <= 0 ||
427 ((count >= FL_MAX_PER_SOCK ||
428 (count > 0 && room < FL_MAX_SIZE/2) || room < FL_MAX_SIZE/4) &&
429 !capable(CAP_NET_ADMIN)))
430 return -ENOBUFS;
431
432 return 0;
433 }
434
435 static int ipv6_hdr_cmp(struct ipv6_opt_hdr *h1, struct ipv6_opt_hdr *h2)
436 {
437 if (h1 == h2)
438 return 0;
439 if (h1 == NULL || h2 == NULL)
440 return 1;
441 if (h1->hdrlen != h2->hdrlen)
442 return 1;
443 return memcmp(h1+1, h2+1, ((h1->hdrlen+1)<<3) - sizeof(*h1));
444 }
445
446 static int ipv6_opt_cmp(struct ipv6_txoptions *o1, struct ipv6_txoptions *o2)
447 {
448 if (o1 == o2)
449 return 0;
450 if (o1 == NULL || o2 == NULL)
451 return 1;
452 if (o1->opt_nflen != o2->opt_nflen)
453 return 1;
454 if (ipv6_hdr_cmp(o1->hopopt, o2->hopopt))
455 return 1;
456 if (ipv6_hdr_cmp(o1->dst0opt, o2->dst0opt))
457 return 1;
458 if (ipv6_hdr_cmp((struct ipv6_opt_hdr *)o1->srcrt, (struct ipv6_opt_hdr *)o2->srcrt))
459 return 1;
460 return 0;
461 }
462
463 static inline void fl_link(struct ipv6_pinfo *np, struct ipv6_fl_socklist *sfl,
464 struct ip6_flowlabel *fl)
465 {
466 write_lock_bh(&ip6_sk_fl_lock);
467 sfl->fl = fl;
468 sfl->next = np->ipv6_fl_list;
469 np->ipv6_fl_list = sfl;
470 write_unlock_bh(&ip6_sk_fl_lock);
471 }
472
473 int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen)
474 {
475 int uninitialized_var(err);
476 struct net *net = sock_net(sk);
477 struct ipv6_pinfo *np = inet6_sk(sk);
478 struct in6_flowlabel_req freq;
479 struct ipv6_fl_socklist *sfl1=NULL;
480 struct ipv6_fl_socklist *sfl, **sflp;
481 struct ip6_flowlabel *fl, *fl1 = NULL;
482
483
484 if (optlen < sizeof(freq))
485 return -EINVAL;
486
487 if (copy_from_user(&freq, optval, sizeof(freq)))
488 return -EFAULT;
489
490 switch (freq.flr_action) {
491 case IPV6_FL_A_PUT:
492 write_lock_bh(&ip6_sk_fl_lock);
493 for (sflp = &np->ipv6_fl_list; (sfl=*sflp)!=NULL; sflp = &sfl->next) {
494 if (sfl->fl->label == freq.flr_label) {
495 if (freq.flr_label == (np->flow_label&IPV6_FLOWLABEL_MASK))
496 np->flow_label &= ~IPV6_FLOWLABEL_MASK;
497 *sflp = sfl->next;
498 write_unlock_bh(&ip6_sk_fl_lock);
499 fl_release(sfl->fl);
500 kfree(sfl);
501 return 0;
502 }
503 }
504 write_unlock_bh(&ip6_sk_fl_lock);
505 return -ESRCH;
506
507 case IPV6_FL_A_RENEW:
508 read_lock_bh(&ip6_sk_fl_lock);
509 for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) {
510 if (sfl->fl->label == freq.flr_label) {
511 err = fl6_renew(sfl->fl, freq.flr_linger, freq.flr_expires);
512 read_unlock_bh(&ip6_sk_fl_lock);
513 return err;
514 }
515 }
516 read_unlock_bh(&ip6_sk_fl_lock);
517
518 if (freq.flr_share == IPV6_FL_S_NONE && capable(CAP_NET_ADMIN)) {
519 fl = fl_lookup(net, freq.flr_label);
520 if (fl) {
521 err = fl6_renew(fl, freq.flr_linger, freq.flr_expires);
522 fl_release(fl);
523 return err;
524 }
525 }
526 return -ESRCH;
527
528 case IPV6_FL_A_GET:
529 if (freq.flr_label & ~IPV6_FLOWLABEL_MASK)
530 return -EINVAL;
531
532 fl = fl_create(net, sk, &freq, optval, optlen, &err);
533 if (fl == NULL)
534 return err;
535 sfl1 = kmalloc(sizeof(*sfl1), GFP_KERNEL);
536
537 if (freq.flr_label) {
538 err = -EEXIST;
539 read_lock_bh(&ip6_sk_fl_lock);
540 for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) {
541 if (sfl->fl->label == freq.flr_label) {
542 if (freq.flr_flags&IPV6_FL_F_EXCL) {
543 read_unlock_bh(&ip6_sk_fl_lock);
544 goto done;
545 }
546 fl1 = sfl->fl;
547 atomic_inc(&fl1->users);
548 break;
549 }
550 }
551 read_unlock_bh(&ip6_sk_fl_lock);
552
553 if (fl1 == NULL)
554 fl1 = fl_lookup(net, freq.flr_label);
555 if (fl1) {
556 recheck:
557 err = -EEXIST;
558 if (freq.flr_flags&IPV6_FL_F_EXCL)
559 goto release;
560 err = -EPERM;
561 if (fl1->share == IPV6_FL_S_EXCL ||
562 fl1->share != fl->share ||
563 fl1->owner != fl->owner)
564 goto release;
565
566 err = -EINVAL;
567 if (!ipv6_addr_equal(&fl1->dst, &fl->dst) ||
568 ipv6_opt_cmp(fl1->opt, fl->opt))
569 goto release;
570
571 err = -ENOMEM;
572 if (sfl1 == NULL)
573 goto release;
574 if (fl->linger > fl1->linger)
575 fl1->linger = fl->linger;
576 if ((long)(fl->expires - fl1->expires) > 0)
577 fl1->expires = fl->expires;
578 fl_link(np, sfl1, fl1);
579 fl_free(fl);
580 return 0;
581
582 release:
583 fl_release(fl1);
584 goto done;
585 }
586 }
587 err = -ENOENT;
588 if (!(freq.flr_flags&IPV6_FL_F_CREATE))
589 goto done;
590
591 err = -ENOMEM;
592 if (sfl1 == NULL || (err = mem_check(sk)) != 0)
593 goto done;
594
595 fl1 = fl_intern(net, fl, freq.flr_label);
596 if (fl1 != NULL)
597 goto recheck;
598
599 if (!freq.flr_label) {
600 if (copy_to_user(&((struct in6_flowlabel_req __user *) optval)->flr_label,
601 &fl->label, sizeof(fl->label))) {
602 /* Intentionally ignore fault. */
603 }
604 }
605
606 fl_link(np, sfl1, fl);
607 return 0;
608
609 default:
610 return -EINVAL;
611 }
612
613 done:
614 fl_free(fl);
615 kfree(sfl1);
616 return err;
617 }
618
619 #ifdef CONFIG_PROC_FS
620
621 struct ip6fl_iter_state {
622 struct seq_net_private p;
623 int bucket;
624 };
625
626 #define ip6fl_seq_private(seq) ((struct ip6fl_iter_state *)(seq)->private)
627
628 static struct ip6_flowlabel *ip6fl_get_first(struct seq_file *seq)
629 {
630 struct ip6_flowlabel *fl = NULL;
631 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
632 struct net *net = seq_file_net(seq);
633
634 for (state->bucket = 0; state->bucket <= FL_HASH_MASK; ++state->bucket) {
635 fl = fl_ht[state->bucket];
636
637 while (fl && !net_eq(fl->fl_net, net))
638 fl = fl->next;
639 if (fl)
640 break;
641 }
642 return fl;
643 }
644
645 static struct ip6_flowlabel *ip6fl_get_next(struct seq_file *seq, struct ip6_flowlabel *fl)
646 {
647 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
648 struct net *net = seq_file_net(seq);
649
650 fl = fl->next;
651 try_again:
652 while (fl && !net_eq(fl->fl_net, net))
653 fl = fl->next;
654
655 while (!fl) {
656 if (++state->bucket <= FL_HASH_MASK) {
657 fl = fl_ht[state->bucket];
658 goto try_again;
659 } else
660 break;
661 }
662 return fl;
663 }
664
665 static struct ip6_flowlabel *ip6fl_get_idx(struct seq_file *seq, loff_t pos)
666 {
667 struct ip6_flowlabel *fl = ip6fl_get_first(seq);
668 if (fl)
669 while (pos && (fl = ip6fl_get_next(seq, fl)) != NULL)
670 --pos;
671 return pos ? NULL : fl;
672 }
673
674 static void *ip6fl_seq_start(struct seq_file *seq, loff_t *pos)
675 __acquires(ip6_fl_lock)
676 {
677 read_lock_bh(&ip6_fl_lock);
678 return *pos ? ip6fl_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
679 }
680
681 static void *ip6fl_seq_next(struct seq_file *seq, void *v, loff_t *pos)
682 {
683 struct ip6_flowlabel *fl;
684
685 if (v == SEQ_START_TOKEN)
686 fl = ip6fl_get_first(seq);
687 else
688 fl = ip6fl_get_next(seq, v);
689 ++*pos;
690 return fl;
691 }
692
693 static void ip6fl_seq_stop(struct seq_file *seq, void *v)
694 __releases(ip6_fl_lock)
695 {
696 read_unlock_bh(&ip6_fl_lock);
697 }
698
699 static int ip6fl_seq_show(struct seq_file *seq, void *v)
700 {
701 if (v == SEQ_START_TOKEN)
702 seq_printf(seq, "%-5s %-1s %-6s %-6s %-6s %-8s %-32s %s\n",
703 "Label", "S", "Owner", "Users", "Linger", "Expires", "Dst", "Opt");
704 else {
705 struct ip6_flowlabel *fl = v;
706 seq_printf(seq,
707 "%05X %-1d %-6d %-6d %-6ld %-8ld %pi6 %-4d\n",
708 (unsigned)ntohl(fl->label),
709 fl->share,
710 (unsigned)fl->owner,
711 atomic_read(&fl->users),
712 fl->linger/HZ,
713 (long)(fl->expires - jiffies)/HZ,
714 &fl->dst,
715 fl->opt ? fl->opt->opt_nflen : 0);
716 }
717 return 0;
718 }
719
720 static const struct seq_operations ip6fl_seq_ops = {
721 .start = ip6fl_seq_start,
722 .next = ip6fl_seq_next,
723 .stop = ip6fl_seq_stop,
724 .show = ip6fl_seq_show,
725 };
726
727 static int ip6fl_seq_open(struct inode *inode, struct file *file)
728 {
729 return seq_open_net(inode, file, &ip6fl_seq_ops,
730 sizeof(struct ip6fl_iter_state));
731 }
732
733 static const struct file_operations ip6fl_seq_fops = {
734 .owner = THIS_MODULE,
735 .open = ip6fl_seq_open,
736 .read = seq_read,
737 .llseek = seq_lseek,
738 .release = seq_release_net,
739 };
740
741 static int __net_init ip6_flowlabel_proc_init(struct net *net)
742 {
743 if (!proc_net_fops_create(net, "ip6_flowlabel",
744 S_IRUGO, &ip6fl_seq_fops))
745 return -ENOMEM;
746 return 0;
747 }
748
749 static void __net_exit ip6_flowlabel_proc_fini(struct net *net)
750 {
751 proc_net_remove(net, "ip6_flowlabel");
752 }
753 #else
754 static inline int ip6_flowlabel_proc_init(struct net *net)
755 {
756 return 0;
757 }
758 static inline void ip6_flowlabel_proc_fini(struct net *net)
759 {
760 }
761 #endif
762
763 static void __net_exit ip6_flowlabel_net_exit(struct net *net)
764 {
765 ip6_fl_purge(net);
766 ip6_flowlabel_proc_fini(net);
767 }
768
769 static struct pernet_operations ip6_flowlabel_net_ops = {
770 .init = ip6_flowlabel_proc_init,
771 .exit = ip6_flowlabel_net_exit,
772 };
773
774 int ip6_flowlabel_init(void)
775 {
776 return register_pernet_subsys(&ip6_flowlabel_net_ops);
777 }
778
779 void ip6_flowlabel_cleanup(void)
780 {
781 del_timer(&ip6_fl_gc_timer);
782 unregister_pernet_subsys(&ip6_flowlabel_net_ops);
783 }