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Add linux-next specific files for 20110831
[linux-2.6/next.git] / net / ipv6 / ip6_flowlabel.c
blob5430394501938dd4b288113162c060831f2b8db7
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
25 #include <net/net_namespace.h>
26 #include <net/sock.h>
27
28 #include <net/ipv6.h>
29 #include <net/ndisc.h>
30 #include <net/protocol.h>
31 #include <net/ip6_route.h>
32 #include <net/addrconf.h>
33 #include <net/rawv6.h>
34 #include <net/icmp.h>
35 #include <net/transp_v6.h>
36
37 #include <asm/uaccess.h>
38
39 #define FL_MIN_LINGER 6 /* Minimal linger. It is set to 6sec specified
40 in old IPv6 RFC. Well, it was reasonable value.
41 */
42 #define FL_MAX_LINGER 60 /* Maximal linger timeout */
43
44 /* FL hash table */
45
46 #define FL_MAX_PER_SOCK 32
47 #define FL_MAX_SIZE 4096
48 #define FL_HASH_MASK 255
49 #define FL_HASH(l) (ntohl(l)&FL_HASH_MASK)
50
51 static atomic_t fl_size = ATOMIC_INIT(0);
52 static struct ip6_flowlabel *fl_ht[FL_HASH_MASK+1];
53
54 static void ip6_fl_gc(unsigned long dummy);
55 static DEFINE_TIMER(ip6_fl_gc_timer, ip6_fl_gc, 0, 0);
56
57 /* FL hash table lock: it protects only of GC */
58
59 static DEFINE_RWLOCK(ip6_fl_lock);
60
61 /* Big socket sock */
62
63 static DEFINE_RWLOCK(ip6_sk_fl_lock);
64
65
66 static inline struct ip6_flowlabel *__fl_lookup(struct net *net, __be32 label)
67 {
68 struct ip6_flowlabel *fl;
69
70 for (fl=fl_ht[FL_HASH(label)]; fl; fl = fl->next) {
71 if (fl->label == label && net_eq(fl->fl_net, net))
72 return fl;
73 }
74 return NULL;
75 }
76
77 static struct ip6_flowlabel *fl_lookup(struct net *net, __be32 label)
78 {
79 struct ip6_flowlabel *fl;
80
81 read_lock_bh(&ip6_fl_lock);
82 fl = __fl_lookup(net, label);
83 if (fl)
84 atomic_inc(&fl->users);
85 read_unlock_bh(&ip6_fl_lock);
86 return fl;
87 }
88
89
90 static void fl_free(struct ip6_flowlabel *fl)
91 {
92 if (fl) {
93 release_net(fl->fl_net);
94 kfree(fl->opt);
95 }
96 kfree(fl);
97 }
98
99 static void fl_release(struct ip6_flowlabel *fl)
100 {
101 write_lock_bh(&ip6_fl_lock);
102
103 fl->lastuse = jiffies;
104 if (atomic_dec_and_test(&fl->users)) {
105 unsigned long ttd = fl->lastuse + fl->linger;
106 if (time_after(ttd, fl->expires))
107 fl->expires = ttd;
108 ttd = fl->expires;
109 if (fl->opt && fl->share == IPV6_FL_S_EXCL) {
110 struct ipv6_txoptions *opt = fl->opt;
111 fl->opt = NULL;
112 kfree(opt);
113 }
114 if (!timer_pending(&ip6_fl_gc_timer) ||
115 time_after(ip6_fl_gc_timer.expires, ttd))
116 mod_timer(&ip6_fl_gc_timer, ttd);
117 }
118 write_unlock_bh(&ip6_fl_lock);
119 }
120
121 static void ip6_fl_gc(unsigned long dummy)
122 {
123 int i;
124 unsigned long now = jiffies;
125 unsigned long sched = 0;
126
127 write_lock(&ip6_fl_lock);
128
129 for (i=0; i<=FL_HASH_MASK; i++) {
130 struct ip6_flowlabel *fl, **flp;
131 flp = &fl_ht[i];
132 while ((fl=*flp) != NULL) {
133 if (atomic_read(&fl->users) == 0) {
134 unsigned long ttd = fl->lastuse + fl->linger;
135 if (time_after(ttd, fl->expires))
136 fl->expires = ttd;
137 ttd = fl->expires;
138 if (time_after_eq(now, ttd)) {
139 *flp = fl->next;
140 fl_free(fl);
141 atomic_dec(&fl_size);
142 continue;
143 }
144 if (!sched || time_before(ttd, sched))
145 sched = ttd;
146 }
147 flp = &fl->next;
148 }
149 }
150 if (!sched && atomic_read(&fl_size))
151 sched = now + FL_MAX_LINGER;
152 if (sched) {
153 mod_timer(&ip6_fl_gc_timer, sched);
154 }
155 write_unlock(&ip6_fl_lock);
156 }
157
158 static void __net_exit ip6_fl_purge(struct net *net)
159 {
160 int i;
161
162 write_lock(&ip6_fl_lock);
163 for (i = 0; i <= FL_HASH_MASK; i++) {
164 struct ip6_flowlabel *fl, **flp;
165 flp = &fl_ht[i];
166 while ((fl = *flp) != NULL) {
167 if (net_eq(fl->fl_net, net) &&
168 atomic_read(&fl->users) == 0) {
169 *flp = fl->next;
170 fl_free(fl);
171 atomic_dec(&fl_size);
172 continue;
173 }
174 flp = &fl->next;
175 }
176 }
177 write_unlock(&ip6_fl_lock);
178 }
179
180 static struct ip6_flowlabel *fl_intern(struct net *net,
181 struct ip6_flowlabel *fl, __be32 label)
182 {
183 struct ip6_flowlabel *lfl;
184
185 fl->label = label & IPV6_FLOWLABEL_MASK;
186
187 write_lock_bh(&ip6_fl_lock);
188 if (label == 0) {
189 for (;;) {
190 fl->label = htonl(net_random())&IPV6_FLOWLABEL_MASK;
191 if (fl->label) {
192 lfl = __fl_lookup(net, fl->label);
193 if (lfl == NULL)
194 break;
195 }
196 }
197 } else {
198 /*
199 * we dropper the ip6_fl_lock, so this entry could reappear
200 * and we need to recheck with it.
201 *
202 * OTOH no need to search the active socket first, like it is
203 * done in ipv6_flowlabel_opt - sock is locked, so new entry
204 * with the same label can only appear on another sock
205 */
206 lfl = __fl_lookup(net, fl->label);
207 if (lfl != NULL) {
208 atomic_inc(&lfl->users);
209 write_unlock_bh(&ip6_fl_lock);
210 return lfl;
211 }
212 }
213
214 fl->lastuse = jiffies;
215 fl->next = fl_ht[FL_HASH(fl->label)];
216 fl_ht[FL_HASH(fl->label)] = fl;
217 atomic_inc(&fl_size);
218 write_unlock_bh(&ip6_fl_lock);
219 return NULL;
220 }
221
222
223
224 /* Socket flowlabel lists */
225
226 struct ip6_flowlabel * fl6_sock_lookup(struct sock *sk, __be32 label)
227 {
228 struct ipv6_fl_socklist *sfl;
229 struct ipv6_pinfo *np = inet6_sk(sk);
230
231 label &= IPV6_FLOWLABEL_MASK;
232
233 read_lock_bh(&ip6_sk_fl_lock);
234 for (sfl=np->ipv6_fl_list; sfl; sfl = sfl->next) {
235 struct ip6_flowlabel *fl = sfl->fl;
236 if (fl->label == label) {
237 fl->lastuse = jiffies;
238 atomic_inc(&fl->users);
239 read_unlock_bh(&ip6_sk_fl_lock);
240 return fl;
241 }
242 }
243 read_unlock_bh(&ip6_sk_fl_lock);
244 return NULL;
245 }
246
247 EXPORT_SYMBOL_GPL(fl6_sock_lookup);
248
249 void fl6_free_socklist(struct sock *sk)
250 {
251 struct ipv6_pinfo *np = inet6_sk(sk);
252 struct ipv6_fl_socklist *sfl;
253
254 while ((sfl = np->ipv6_fl_list) != NULL) {
255 np->ipv6_fl_list = sfl->next;
256 fl_release(sfl->fl);
257 kfree(sfl);
258 }
259 }
260
261 /* Service routines */
262
263
264 /*
265 It is the only difficult place. flowlabel enforces equal headers
266 before and including routing header, however user may supply options
267 following rthdr.
268 */
269
270 struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
271 struct ip6_flowlabel * fl,
272 struct ipv6_txoptions * fopt)
273 {
274 struct ipv6_txoptions * fl_opt = fl->opt;
275
276 if (fopt == NULL || fopt->opt_flen == 0)
277 return fl_opt;
278
279 if (fl_opt != NULL) {
280 opt_space->hopopt = fl_opt->hopopt;
281 opt_space->dst0opt = fl_opt->dst0opt;
282 opt_space->srcrt = fl_opt->srcrt;
283 opt_space->opt_nflen = fl_opt->opt_nflen;
284 } else {
285 if (fopt->opt_nflen == 0)
286 return fopt;
287 opt_space->hopopt = NULL;
288 opt_space->dst0opt = NULL;
289 opt_space->srcrt = NULL;
290 opt_space->opt_nflen = 0;
291 }
292 opt_space->dst1opt = fopt->dst1opt;
293 opt_space->opt_flen = fopt->opt_flen;
294 return opt_space;
295 }
296
297 static unsigned long check_linger(unsigned long ttl)
298 {
299 if (ttl < FL_MIN_LINGER)
300 return FL_MIN_LINGER*HZ;
301 if (ttl > FL_MAX_LINGER && !capable(CAP_NET_ADMIN))
302 return 0;
303 return ttl*HZ;
304 }
305
306 static int fl6_renew(struct ip6_flowlabel *fl, unsigned long linger, unsigned long expires)
307 {
308 linger = check_linger(linger);
309 if (!linger)
310 return -EPERM;
311 expires = check_linger(expires);
312 if (!expires)
313 return -EPERM;
314 fl->lastuse = jiffies;
315 if (time_before(fl->linger, linger))
316 fl->linger = linger;
317 if (time_before(expires, fl->linger))
318 expires = fl->linger;
319 if (time_before(fl->expires, fl->lastuse + expires))
320 fl->expires = fl->lastuse + expires;
321 return 0;
322 }
323
324 static struct ip6_flowlabel *
325 fl_create(struct net *net, struct sock *sk, struct in6_flowlabel_req *freq,
326 char __user *optval, int optlen, int *err_p)
327 {
328 struct ip6_flowlabel *fl = NULL;
329 int olen;
330 int addr_type;
331 int err;
332
333 olen = optlen - CMSG_ALIGN(sizeof(*freq));
334 err = -EINVAL;
335 if (olen > 64 * 1024)
336 goto done;
337
338 err = -ENOMEM;
339 fl = kzalloc(sizeof(*fl), GFP_KERNEL);
340 if (fl == NULL)
341 goto done;
342
343 if (olen > 0) {
344 struct msghdr msg;
345 struct flowi6 flowi6;
346 int junk;
347
348 err = -ENOMEM;
349 fl->opt = kmalloc(sizeof(*fl->opt) + olen, GFP_KERNEL);
350 if (fl->opt == NULL)
351 goto done;
352
353 memset(fl->opt, 0, sizeof(*fl->opt));
354 fl->opt->tot_len = sizeof(*fl->opt) + olen;
355 err = -EFAULT;
356 if (copy_from_user(fl->opt+1, optval+CMSG_ALIGN(sizeof(*freq)), olen))
357 goto done;
358
359 msg.msg_controllen = olen;
360 msg.msg_control = (void*)(fl->opt+1);
361 memset(&flowi6, 0, sizeof(flowi6));
362
363 err = datagram_send_ctl(net, sk, &msg, &flowi6, fl->opt, &junk,
364 &junk, &junk);
365 if (err)
366 goto done;
367 err = -EINVAL;
368 if (fl->opt->opt_flen)
369 goto done;
370 if (fl->opt->opt_nflen == 0) {
371 kfree(fl->opt);
372 fl->opt = NULL;
373 }
374 }
375
376 fl->fl_net = hold_net(net);
377 fl->expires = jiffies;
378 err = fl6_renew(fl, freq->flr_linger, freq->flr_expires);
379 if (err)
380 goto done;
381 fl->share = freq->flr_share;
382 addr_type = ipv6_addr_type(&freq->flr_dst);
383 if ((addr_type & IPV6_ADDR_MAPPED) ||
384 addr_type == IPV6_ADDR_ANY) {
385 err = -EINVAL;
386 goto done;
387 }
388 ipv6_addr_copy(&fl->dst, &freq->flr_dst);
389 atomic_set(&fl->users, 1);
390 switch (fl->share) {
391 case IPV6_FL_S_EXCL:
392 case IPV6_FL_S_ANY:
393 break;
394 case IPV6_FL_S_PROCESS:
395 fl->owner = current->pid;
396 break;
397 case IPV6_FL_S_USER:
398 fl->owner = current_euid();
399 break;
400 default:
401 err = -EINVAL;
402 goto done;
403 }
404 return fl;
405
406 done:
407 fl_free(fl);
408 *err_p = err;
409 return NULL;
410 }
411
412 static int mem_check(struct sock *sk)
413 {
414 struct ipv6_pinfo *np = inet6_sk(sk);
415 struct ipv6_fl_socklist *sfl;
416 int room = FL_MAX_SIZE - atomic_read(&fl_size);
417 int count = 0;
418
419 if (room > FL_MAX_SIZE - FL_MAX_PER_SOCK)
420 return 0;
421
422 for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next)
423 count++;
424
425 if (room <= 0 ||
426 ((count >= FL_MAX_PER_SOCK ||
427 (count > 0 && room < FL_MAX_SIZE/2) || room < FL_MAX_SIZE/4) &&
428 !capable(CAP_NET_ADMIN)))
429 return -ENOBUFS;
430
431 return 0;
432 }
433
434 static int ipv6_hdr_cmp(struct ipv6_opt_hdr *h1, struct ipv6_opt_hdr *h2)
435 {
436 if (h1 == h2)
437 return 0;
438 if (h1 == NULL || h2 == NULL)
439 return 1;
440 if (h1->hdrlen != h2->hdrlen)
441 return 1;
442 return memcmp(h1+1, h2+1, ((h1->hdrlen+1)<<3) - sizeof(*h1));
443 }
444
445 static int ipv6_opt_cmp(struct ipv6_txoptions *o1, struct ipv6_txoptions *o2)
446 {
447 if (o1 == o2)
448 return 0;
449 if (o1 == NULL || o2 == NULL)
450 return 1;
451 if (o1->opt_nflen != o2->opt_nflen)
452 return 1;
453 if (ipv6_hdr_cmp(o1->hopopt, o2->hopopt))
454 return 1;
455 if (ipv6_hdr_cmp(o1->dst0opt, o2->dst0opt))
456 return 1;
457 if (ipv6_hdr_cmp((struct ipv6_opt_hdr *)o1->srcrt, (struct ipv6_opt_hdr *)o2->srcrt))
458 return 1;
459 return 0;
460 }
461
462 static inline void fl_link(struct ipv6_pinfo *np, struct ipv6_fl_socklist *sfl,
463 struct ip6_flowlabel *fl)
464 {
465 write_lock_bh(&ip6_sk_fl_lock);
466 sfl->fl = fl;
467 sfl->next = np->ipv6_fl_list;
468 np->ipv6_fl_list = sfl;
469 write_unlock_bh(&ip6_sk_fl_lock);
470 }
471
472 int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen)
473 {
474 int uninitialized_var(err);
475 struct net *net = sock_net(sk);
476 struct ipv6_pinfo *np = inet6_sk(sk);
477 struct in6_flowlabel_req freq;
478 struct ipv6_fl_socklist *sfl1=NULL;
479 struct ipv6_fl_socklist *sfl, **sflp;
480 struct ip6_flowlabel *fl, *fl1 = NULL;
481
482
483 if (optlen < sizeof(freq))
484 return -EINVAL;
485
486 if (copy_from_user(&freq, optval, sizeof(freq)))
487 return -EFAULT;
488
489 switch (freq.flr_action) {
490 case IPV6_FL_A_PUT:
491 write_lock_bh(&ip6_sk_fl_lock);
492 for (sflp = &np->ipv6_fl_list; (sfl=*sflp)!=NULL; sflp = &sfl->next) {
493 if (sfl->fl->label == freq.flr_label) {
494 if (freq.flr_label == (np->flow_label&IPV6_FLOWLABEL_MASK))
495 np->flow_label &= ~IPV6_FLOWLABEL_MASK;
496 *sflp = sfl->next;
497 write_unlock_bh(&ip6_sk_fl_lock);
498 fl_release(sfl->fl);
499 kfree(sfl);
500 return 0;
501 }
502 }
503 write_unlock_bh(&ip6_sk_fl_lock);
504 return -ESRCH;
505
506 case IPV6_FL_A_RENEW:
507 read_lock_bh(&ip6_sk_fl_lock);
508 for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) {
509 if (sfl->fl->label == freq.flr_label) {
510 err = fl6_renew(sfl->fl, freq.flr_linger, freq.flr_expires);
511 read_unlock_bh(&ip6_sk_fl_lock);
512 return err;
513 }
514 }
515 read_unlock_bh(&ip6_sk_fl_lock);
516
517 if (freq.flr_share == IPV6_FL_S_NONE && capable(CAP_NET_ADMIN)) {
518 fl = fl_lookup(net, freq.flr_label);
519 if (fl) {
520 err = fl6_renew(fl, freq.flr_linger, freq.flr_expires);
521 fl_release(fl);
522 return err;
523 }
524 }
525 return -ESRCH;
526
527 case IPV6_FL_A_GET:
528 if (freq.flr_label & ~IPV6_FLOWLABEL_MASK)
529 return -EINVAL;
530
531 fl = fl_create(net, sk, &freq, optval, optlen, &err);
532 if (fl == NULL)
533 return err;
534 sfl1 = kmalloc(sizeof(*sfl1), GFP_KERNEL);
535
536 if (freq.flr_label) {
537 err = -EEXIST;
538 read_lock_bh(&ip6_sk_fl_lock);
539 for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) {
540 if (sfl->fl->label == freq.flr_label) {
541 if (freq.flr_flags&IPV6_FL_F_EXCL) {
542 read_unlock_bh(&ip6_sk_fl_lock);
543 goto done;
544 }
545 fl1 = sfl->fl;
546 atomic_inc(&fl1->users);
547 break;
548 }
549 }
550 read_unlock_bh(&ip6_sk_fl_lock);
551
552 if (fl1 == NULL)
553 fl1 = fl_lookup(net, freq.flr_label);
554 if (fl1) {
555 recheck:
556 err = -EEXIST;
557 if (freq.flr_flags&IPV6_FL_F_EXCL)
558 goto release;
559 err = -EPERM;
560 if (fl1->share == IPV6_FL_S_EXCL ||
561 fl1->share != fl->share ||
562 fl1->owner != fl->owner)
563 goto release;
564
565 err = -EINVAL;
566 if (!ipv6_addr_equal(&fl1->dst, &fl->dst) ||
567 ipv6_opt_cmp(fl1->opt, fl->opt))
568 goto release;
569
570 err = -ENOMEM;
571 if (sfl1 == NULL)
572 goto release;
573 if (fl->linger > fl1->linger)
574 fl1->linger = fl->linger;
575 if ((long)(fl->expires - fl1->expires) > 0)
576 fl1->expires = fl->expires;
577 fl_link(np, sfl1, fl1);
578 fl_free(fl);
579 return 0;
580
581 release:
582 fl_release(fl1);
583 goto done;
584 }
585 }
586 err = -ENOENT;
587 if (!(freq.flr_flags&IPV6_FL_F_CREATE))
588 goto done;
589
590 err = -ENOMEM;
591 if (sfl1 == NULL || (err = mem_check(sk)) != 0)
592 goto done;
593
594 fl1 = fl_intern(net, fl, freq.flr_label);
595 if (fl1 != NULL)
596 goto recheck;
597
598 if (!freq.flr_label) {
599 if (copy_to_user(&((struct in6_flowlabel_req __user *) optval)->flr_label,
600 &fl->label, sizeof(fl->label))) {
601 /* Intentionally ignore fault. */
602 }
603 }
604
605 fl_link(np, sfl1, fl);
606 return 0;
607
608 default:
609 return -EINVAL;
610 }
611
612 done:
613 fl_free(fl);
614 kfree(sfl1);
615 return err;
616 }
617
618 #ifdef CONFIG_PROC_FS
619
620 struct ip6fl_iter_state {
621 struct seq_net_private p;
622 int bucket;
623 };
624
625 #define ip6fl_seq_private(seq) ((struct ip6fl_iter_state *)(seq)->private)
626
627 static struct ip6_flowlabel *ip6fl_get_first(struct seq_file *seq)
628 {
629 struct ip6_flowlabel *fl = NULL;
630 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
631 struct net *net = seq_file_net(seq);
632
633 for (state->bucket = 0; state->bucket <= FL_HASH_MASK; ++state->bucket) {
634 fl = fl_ht[state->bucket];
635
636 while (fl && !net_eq(fl->fl_net, net))
637 fl = fl->next;
638 if (fl)
639 break;
640 }
641 return fl;
642 }
643
644 static struct ip6_flowlabel *ip6fl_get_next(struct seq_file *seq, struct ip6_flowlabel *fl)
645 {
646 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
647 struct net *net = seq_file_net(seq);
648
649 fl = fl->next;
650 try_again:
651 while (fl && !net_eq(fl->fl_net, net))
652 fl = fl->next;
653
654 while (!fl) {
655 if (++state->bucket <= FL_HASH_MASK) {
656 fl = fl_ht[state->bucket];
657 goto try_again;
658 } else
659 break;
660 }
661 return fl;
662 }
663
664 static struct ip6_flowlabel *ip6fl_get_idx(struct seq_file *seq, loff_t pos)
665 {
666 struct ip6_flowlabel *fl = ip6fl_get_first(seq);
667 if (fl)
668 while (pos && (fl = ip6fl_get_next(seq, fl)) != NULL)
669 --pos;
670 return pos ? NULL : fl;
671 }
672
673 static void *ip6fl_seq_start(struct seq_file *seq, loff_t *pos)
674 __acquires(ip6_fl_lock)
675 {
676 read_lock_bh(&ip6_fl_lock);
677 return *pos ? ip6fl_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
678 }
679
680 static void *ip6fl_seq_next(struct seq_file *seq, void *v, loff_t *pos)
681 {
682 struct ip6_flowlabel *fl;
683
684 if (v == SEQ_START_TOKEN)
685 fl = ip6fl_get_first(seq);
686 else
687 fl = ip6fl_get_next(seq, v);
688 ++*pos;
689 return fl;
690 }
691
692 static void ip6fl_seq_stop(struct seq_file *seq, void *v)
693 __releases(ip6_fl_lock)
694 {
695 read_unlock_bh(&ip6_fl_lock);
696 }
697
698 static int ip6fl_seq_show(struct seq_file *seq, void *v)
699 {
700 if (v == SEQ_START_TOKEN)
701 seq_printf(seq, "%-5s %-1s %-6s %-6s %-6s %-8s %-32s %s\n",
702 "Label", "S", "Owner", "Users", "Linger", "Expires", "Dst", "Opt");
703 else {
704 struct ip6_flowlabel *fl = v;
705 seq_printf(seq,
706 "%05X %-1d %-6d %-6d %-6ld %-8ld %pi6 %-4d\n",
707 (unsigned)ntohl(fl->label),
708 fl->share,
709 (unsigned)fl->owner,
710 atomic_read(&fl->users),
711 fl->linger/HZ,
712 (long)(fl->expires - jiffies)/HZ,
713 &fl->dst,
714 fl->opt ? fl->opt->opt_nflen : 0);
715 }
716 return 0;
717 }
718
719 static const struct seq_operations ip6fl_seq_ops = {
720 .start = ip6fl_seq_start,
721 .next = ip6fl_seq_next,
722 .stop = ip6fl_seq_stop,
723 .show = ip6fl_seq_show,
724 };
725
726 static int ip6fl_seq_open(struct inode *inode, struct file *file)
727 {
728 return seq_open_net(inode, file, &ip6fl_seq_ops,
729 sizeof(struct ip6fl_iter_state));
730 }
731
732 static const struct file_operations ip6fl_seq_fops = {
733 .owner = THIS_MODULE,
734 .open = ip6fl_seq_open,
735 .read = seq_read,
736 .llseek = seq_lseek,
737 .release = seq_release_net,
738 };
739
740 static int __net_init ip6_flowlabel_proc_init(struct net *net)
741 {
742 if (!proc_net_fops_create(net, "ip6_flowlabel",
743 S_IRUGO, &ip6fl_seq_fops))
744 return -ENOMEM;
745 return 0;
746 }
747
748 static void __net_exit ip6_flowlabel_proc_fini(struct net *net)
749 {
750 proc_net_remove(net, "ip6_flowlabel");
751 }
752 #else
753 static inline int ip6_flowlabel_proc_init(struct net *net)
754 {
755 return 0;
756 }
757 static inline void ip6_flowlabel_proc_fini(struct net *net)
758 {
759 }
760 #endif
761
762 static void __net_exit ip6_flowlabel_net_exit(struct net *net)
763 {
764 ip6_fl_purge(net);
765 ip6_flowlabel_proc_fini(net);
766 }
767
768 static struct pernet_operations ip6_flowlabel_net_ops = {
769 .init = ip6_flowlabel_proc_init,
770 .exit = ip6_flowlabel_net_exit,
771 };
772
773 int ip6_flowlabel_init(void)
774 {
775 return register_pernet_subsys(&ip6_flowlabel_net_ops);
776 }
777
778 void ip6_flowlabel_cleanup(void)
779 {
780 del_timer(&ip6_fl_gc_timer);
781 unregister_pernet_subsys(&ip6_flowlabel_net_ops);
782 }
linux-next