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powerpc: Use lwarx/ldarx hint in bit locks
[linux-2.6.git] / net / ipv6 / ip6_flowlabel.c
blob6e7bffa2205e07b947ed78faec4e3aa56ee1db25
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
24 #include <net/net_namespace.h>
25 #include <net/sock.h>
26
27 #include <net/ipv6.h>
28 #include <net/ndisc.h>
29 #include <net/protocol.h>
30 #include <net/ip6_route.h>
31 #include <net/addrconf.h>
32 #include <net/rawv6.h>
33 #include <net/icmp.h>
34 #include <net/transp_v6.h>
35
36 #include <asm/uaccess.h>
37
38 #define FL_MIN_LINGER 6 /* Minimal linger. It is set to 6sec specified
39 in old IPv6 RFC. Well, it was reasonable value.
40 */
41 #define FL_MAX_LINGER 60 /* Maximal linger timeout */
42
43 /* FL hash table */
44
45 #define FL_MAX_PER_SOCK 32
46 #define FL_MAX_SIZE 4096
47 #define FL_HASH_MASK 255
48 #define FL_HASH(l) (ntohl(l)&FL_HASH_MASK)
49
50 static atomic_t fl_size = ATOMIC_INIT(0);
51 static struct ip6_flowlabel *fl_ht[FL_HASH_MASK+1];
52
53 static void ip6_fl_gc(unsigned long dummy);
54 static DEFINE_TIMER(ip6_fl_gc_timer, ip6_fl_gc, 0, 0);
55
56 /* FL hash table lock: it protects only of GC */
57
58 static DEFINE_RWLOCK(ip6_fl_lock);
59
60 /* Big socket sock */
61
62 static DEFINE_RWLOCK(ip6_sk_fl_lock);
63
64
65 static inline struct ip6_flowlabel *__fl_lookup(struct net *net, __be32 label)
66 {
67 struct ip6_flowlabel *fl;
68
69 for (fl=fl_ht[FL_HASH(label)]; fl; fl = fl->next) {
70 if (fl->label == label && net_eq(fl->fl_net, net))
71 return fl;
72 }
73 return NULL;
74 }
75
76 static struct ip6_flowlabel *fl_lookup(struct net *net, __be32 label)
77 {
78 struct ip6_flowlabel *fl;
79
80 read_lock_bh(&ip6_fl_lock);
81 fl = __fl_lookup(net, label);
82 if (fl)
83 atomic_inc(&fl->users);
84 read_unlock_bh(&ip6_fl_lock);
85 return fl;
86 }
87
88
89 static void fl_free(struct ip6_flowlabel *fl)
90 {
91 if (fl) {
92 release_net(fl->fl_net);
93 kfree(fl->opt);
94 }
95 kfree(fl);
96 }
97
98 static void fl_release(struct ip6_flowlabel *fl)
99 {
100 write_lock_bh(&ip6_fl_lock);
101
102 fl->lastuse = jiffies;
103 if (atomic_dec_and_test(&fl->users)) {
104 unsigned long ttd = fl->lastuse + fl->linger;
105 if (time_after(ttd, fl->expires))
106 fl->expires = ttd;
107 ttd = fl->expires;
108 if (fl->opt && fl->share == IPV6_FL_S_EXCL) {
109 struct ipv6_txoptions *opt = fl->opt;
110 fl->opt = NULL;
111 kfree(opt);
112 }
113 if (!timer_pending(&ip6_fl_gc_timer) ||
114 time_after(ip6_fl_gc_timer.expires, ttd))
115 mod_timer(&ip6_fl_gc_timer, ttd);
116 }
117 write_unlock_bh(&ip6_fl_lock);
118 }
119
120 static void ip6_fl_gc(unsigned long dummy)
121 {
122 int i;
123 unsigned long now = jiffies;
124 unsigned long sched = 0;
125
126 write_lock(&ip6_fl_lock);
127
128 for (i=0; i<=FL_HASH_MASK; i++) {
129 struct ip6_flowlabel *fl, **flp;
130 flp = &fl_ht[i];
131 while ((fl=*flp) != NULL) {
132 if (atomic_read(&fl->users) == 0) {
133 unsigned long ttd = fl->lastuse + fl->linger;
134 if (time_after(ttd, fl->expires))
135 fl->expires = ttd;
136 ttd = fl->expires;
137 if (time_after_eq(now, ttd)) {
138 *flp = fl->next;
139 fl_free(fl);
140 atomic_dec(&fl_size);
141 continue;
142 }
143 if (!sched || time_before(ttd, sched))
144 sched = ttd;
145 }
146 flp = &fl->next;
147 }
148 }
149 if (!sched && atomic_read(&fl_size))
150 sched = now + FL_MAX_LINGER;
151 if (sched) {
152 mod_timer(&ip6_fl_gc_timer, sched);
153 }
154 write_unlock(&ip6_fl_lock);
155 }
156
157 static void ip6_fl_purge(struct net *net)
158 {
159 int i;
160
161 write_lock(&ip6_fl_lock);
162 for (i = 0; i <= FL_HASH_MASK; i++) {
163 struct ip6_flowlabel *fl, **flp;
164 flp = &fl_ht[i];
165 while ((fl = *flp) != NULL) {
166 if (net_eq(fl->fl_net, net) &&
167 atomic_read(&fl->users) == 0) {
168 *flp = fl->next;
169 fl_free(fl);
170 atomic_dec(&fl_size);
171 continue;
172 }
173 flp = &fl->next;
174 }
175 }
176 write_unlock(&ip6_fl_lock);
177 }
178
179 static struct ip6_flowlabel *fl_intern(struct net *net,
180 struct ip6_flowlabel *fl, __be32 label)
181 {
182 struct ip6_flowlabel *lfl;
183
184 fl->label = label & IPV6_FLOWLABEL_MASK;
185
186 write_lock_bh(&ip6_fl_lock);
187 if (label == 0) {
188 for (;;) {
189 fl->label = htonl(net_random())&IPV6_FLOWLABEL_MASK;
190 if (fl->label) {
191 lfl = __fl_lookup(net, fl->label);
192 if (lfl == NULL)
193 break;
194 }
195 }
196 } else {
197 /*
198 * we dropper the ip6_fl_lock, so this entry could reappear
199 * and we need to recheck with it.
200 *
201 * OTOH no need to search the active socket first, like it is
202 * done in ipv6_flowlabel_opt - sock is locked, so new entry
203 * with the same label can only appear on another sock
204 */
205 lfl = __fl_lookup(net, fl->label);
206 if (lfl != NULL) {
207 atomic_inc(&lfl->users);
208 write_unlock_bh(&ip6_fl_lock);
209 return lfl;
210 }
211 }
212
213 fl->lastuse = jiffies;
214 fl->next = fl_ht[FL_HASH(fl->label)];
215 fl_ht[FL_HASH(fl->label)] = fl;
216 atomic_inc(&fl_size);
217 write_unlock_bh(&ip6_fl_lock);
218 return NULL;
219 }
220
221
222
223 /* Socket flowlabel lists */
224
225 struct ip6_flowlabel * fl6_sock_lookup(struct sock *sk, __be32 label)
226 {
227 struct ipv6_fl_socklist *sfl;
228 struct ipv6_pinfo *np = inet6_sk(sk);
229
230 label &= IPV6_FLOWLABEL_MASK;
231
232 read_lock_bh(&ip6_sk_fl_lock);
233 for (sfl=np->ipv6_fl_list; sfl; sfl = sfl->next) {
234 struct ip6_flowlabel *fl = sfl->fl;
235 if (fl->label == label) {
236 fl->lastuse = jiffies;
237 atomic_inc(&fl->users);
238 read_unlock_bh(&ip6_sk_fl_lock);
239 return fl;
240 }
241 }
242 read_unlock_bh(&ip6_sk_fl_lock);
243 return NULL;
244 }
245
246 EXPORT_SYMBOL_GPL(fl6_sock_lookup);
247
248 void fl6_free_socklist(struct sock *sk)
249 {
250 struct ipv6_pinfo *np = inet6_sk(sk);
251 struct ipv6_fl_socklist *sfl;
252
253 while ((sfl = np->ipv6_fl_list) != NULL) {
254 np->ipv6_fl_list = sfl->next;
255 fl_release(sfl->fl);
256 kfree(sfl);
257 }
258 }
259
260 /* Service routines */
261
262
263 /*
264 It is the only difficult place. flowlabel enforces equal headers
265 before and including routing header, however user may supply options
266 following rthdr.
267 */
268
269 struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
270 struct ip6_flowlabel * fl,
271 struct ipv6_txoptions * fopt)
272 {
273 struct ipv6_txoptions * fl_opt = fl->opt;
274
275 if (fopt == NULL || fopt->opt_flen == 0)
276 return fl_opt;
277
278 if (fl_opt != NULL) {
279 opt_space->hopopt = fl_opt->hopopt;
280 opt_space->dst0opt = fl_opt->dst0opt;
281 opt_space->srcrt = fl_opt->srcrt;
282 opt_space->opt_nflen = fl_opt->opt_nflen;
283 } else {
284 if (fopt->opt_nflen == 0)
285 return fopt;
286 opt_space->hopopt = NULL;
287 opt_space->dst0opt = NULL;
288 opt_space->srcrt = NULL;
289 opt_space->opt_nflen = 0;
290 }
291 opt_space->dst1opt = fopt->dst1opt;
292 opt_space->opt_flen = fopt->opt_flen;
293 return opt_space;
294 }
295
296 static unsigned long check_linger(unsigned long ttl)
297 {
298 if (ttl < FL_MIN_LINGER)
299 return FL_MIN_LINGER*HZ;
300 if (ttl > FL_MAX_LINGER && !capable(CAP_NET_ADMIN))
301 return 0;
302 return ttl*HZ;
303 }
304
305 static int fl6_renew(struct ip6_flowlabel *fl, unsigned long linger, unsigned long expires)
306 {
307 linger = check_linger(linger);
308 if (!linger)
309 return -EPERM;
310 expires = check_linger(expires);
311 if (!expires)
312 return -EPERM;
313 fl->lastuse = jiffies;
314 if (time_before(fl->linger, linger))
315 fl->linger = linger;
316 if (time_before(expires, fl->linger))
317 expires = fl->linger;
318 if (time_before(fl->expires, fl->lastuse + expires))
319 fl->expires = fl->lastuse + expires;
320 return 0;
321 }
322
323 static struct ip6_flowlabel *
324 fl_create(struct net *net, struct in6_flowlabel_req *freq, char __user *optval,
325 int optlen, int *err_p)
326 {
327 struct ip6_flowlabel *fl = NULL;
328 int olen;
329 int addr_type;
330 int err;
331
332 olen = optlen - CMSG_ALIGN(sizeof(*freq));
333 err = -EINVAL;
334 if (olen > 64 * 1024)
335 goto done;
336
337 err = -ENOMEM;
338 fl = kzalloc(sizeof(*fl), GFP_KERNEL);
339 if (fl == NULL)
340 goto done;
341
342 if (olen > 0) {
343 struct msghdr msg;
344 struct flowi flowi;
345 int junk;
346
347 err = -ENOMEM;
348 fl->opt = kmalloc(sizeof(*fl->opt) + olen, GFP_KERNEL);
349 if (fl->opt == NULL)
350 goto done;
351
352 memset(fl->opt, 0, sizeof(*fl->opt));
353 fl->opt->tot_len = sizeof(*fl->opt) + olen;
354 err = -EFAULT;
355 if (copy_from_user(fl->opt+1, optval+CMSG_ALIGN(sizeof(*freq)), olen))
356 goto done;
357
358 msg.msg_controllen = olen;
359 msg.msg_control = (void*)(fl->opt+1);
360 flowi.oif = 0;
361
362 err = datagram_send_ctl(net, &msg, &flowi, fl->opt, &junk, &junk);
363 if (err)
364 goto done;
365 err = -EINVAL;
366 if (fl->opt->opt_flen)
367 goto done;
368 if (fl->opt->opt_nflen == 0) {
369 kfree(fl->opt);
370 fl->opt = NULL;
371 }
372 }
373
374 fl->fl_net = hold_net(net);
375 fl->expires = jiffies;
376 err = fl6_renew(fl, freq->flr_linger, freq->flr_expires);
377 if (err)
378 goto done;
379 fl->share = freq->flr_share;
380 addr_type = ipv6_addr_type(&freq->flr_dst);
381 if ((addr_type & IPV6_ADDR_MAPPED) ||
382 addr_type == IPV6_ADDR_ANY) {
383 err = -EINVAL;
384 goto done;
385 }
386 ipv6_addr_copy(&fl->dst, &freq->flr_dst);
387 atomic_set(&fl->users, 1);
388 switch (fl->share) {
389 case IPV6_FL_S_EXCL:
390 case IPV6_FL_S_ANY:
391 break;
392 case IPV6_FL_S_PROCESS:
393 fl->owner = current->pid;
394 break;
395 case IPV6_FL_S_USER:
396 fl->owner = current_euid();
397 break;
398 default:
399 err = -EINVAL;
400 goto done;
401 }
402 return fl;
403
404 done:
405 fl_free(fl);
406 *err_p = err;
407 return NULL;
408 }
409
410 static int mem_check(struct sock *sk)
411 {
412 struct ipv6_pinfo *np = inet6_sk(sk);
413 struct ipv6_fl_socklist *sfl;
414 int room = FL_MAX_SIZE - atomic_read(&fl_size);
415 int count = 0;
416
417 if (room > FL_MAX_SIZE - FL_MAX_PER_SOCK)
418 return 0;
419
420 for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next)
421 count++;
422
423 if (room <= 0 ||
424 ((count >= FL_MAX_PER_SOCK ||
425 (count > 0 && room < FL_MAX_SIZE/2) || room < FL_MAX_SIZE/4) &&
426 !capable(CAP_NET_ADMIN)))
427 return -ENOBUFS;
428
429 return 0;
430 }
431
432 static int ipv6_hdr_cmp(struct ipv6_opt_hdr *h1, struct ipv6_opt_hdr *h2)
433 {
434 if (h1 == h2)
435 return 0;
436 if (h1 == NULL || h2 == NULL)
437 return 1;
438 if (h1->hdrlen != h2->hdrlen)
439 return 1;
440 return memcmp(h1+1, h2+1, ((h1->hdrlen+1)<<3) - sizeof(*h1));
441 }
442
443 static int ipv6_opt_cmp(struct ipv6_txoptions *o1, struct ipv6_txoptions *o2)
444 {
445 if (o1 == o2)
446 return 0;
447 if (o1 == NULL || o2 == NULL)
448 return 1;
449 if (o1->opt_nflen != o2->opt_nflen)
450 return 1;
451 if (ipv6_hdr_cmp(o1->hopopt, o2->hopopt))
452 return 1;
453 if (ipv6_hdr_cmp(o1->dst0opt, o2->dst0opt))
454 return 1;
455 if (ipv6_hdr_cmp((struct ipv6_opt_hdr *)o1->srcrt, (struct ipv6_opt_hdr *)o2->srcrt))
456 return 1;
457 return 0;
458 }
459
460 static inline void fl_link(struct ipv6_pinfo *np, struct ipv6_fl_socklist *sfl,
461 struct ip6_flowlabel *fl)
462 {
463 write_lock_bh(&ip6_sk_fl_lock);
464 sfl->fl = fl;
465 sfl->next = np->ipv6_fl_list;
466 np->ipv6_fl_list = sfl;
467 write_unlock_bh(&ip6_sk_fl_lock);
468 }
469
470 int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen)
471 {
472 int uninitialized_var(err);
473 struct net *net = sock_net(sk);
474 struct ipv6_pinfo *np = inet6_sk(sk);
475 struct in6_flowlabel_req freq;
476 struct ipv6_fl_socklist *sfl1=NULL;
477 struct ipv6_fl_socklist *sfl, **sflp;
478 struct ip6_flowlabel *fl, *fl1 = NULL;
479
480
481 if (optlen < sizeof(freq))
482 return -EINVAL;
483
484 if (copy_from_user(&freq, optval, sizeof(freq)))
485 return -EFAULT;
486
487 switch (freq.flr_action) {
488 case IPV6_FL_A_PUT:
489 write_lock_bh(&ip6_sk_fl_lock);
490 for (sflp = &np->ipv6_fl_list; (sfl=*sflp)!=NULL; sflp = &sfl->next) {
491 if (sfl->fl->label == freq.flr_label) {
492 if (freq.flr_label == (np->flow_label&IPV6_FLOWLABEL_MASK))
493 np->flow_label &= ~IPV6_FLOWLABEL_MASK;
494 *sflp = sfl->next;
495 write_unlock_bh(&ip6_sk_fl_lock);
496 fl_release(sfl->fl);
497 kfree(sfl);
498 return 0;
499 }
500 }
501 write_unlock_bh(&ip6_sk_fl_lock);
502 return -ESRCH;
503
504 case IPV6_FL_A_RENEW:
505 read_lock_bh(&ip6_sk_fl_lock);
506 for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) {
507 if (sfl->fl->label == freq.flr_label) {
508 err = fl6_renew(sfl->fl, freq.flr_linger, freq.flr_expires);
509 read_unlock_bh(&ip6_sk_fl_lock);
510 return err;
511 }
512 }
513 read_unlock_bh(&ip6_sk_fl_lock);
514
515 if (freq.flr_share == IPV6_FL_S_NONE && capable(CAP_NET_ADMIN)) {
516 fl = fl_lookup(net, freq.flr_label);
517 if (fl) {
518 err = fl6_renew(fl, freq.flr_linger, freq.flr_expires);
519 fl_release(fl);
520 return err;
521 }
522 }
523 return -ESRCH;
524
525 case IPV6_FL_A_GET:
526 if (freq.flr_label & ~IPV6_FLOWLABEL_MASK)
527 return -EINVAL;
528
529 fl = fl_create(net, &freq, optval, optlen, &err);
530 if (fl == NULL)
531 return err;
532 sfl1 = kmalloc(sizeof(*sfl1), GFP_KERNEL);
533
534 if (freq.flr_label) {
535 err = -EEXIST;
536 read_lock_bh(&ip6_sk_fl_lock);
537 for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) {
538 if (sfl->fl->label == freq.flr_label) {
539 if (freq.flr_flags&IPV6_FL_F_EXCL) {
540 read_unlock_bh(&ip6_sk_fl_lock);
541 goto done;
542 }
543 fl1 = sfl->fl;
544 atomic_inc(&fl1->users);
545 break;
546 }
547 }
548 read_unlock_bh(&ip6_sk_fl_lock);
549
550 if (fl1 == NULL)
551 fl1 = fl_lookup(net, freq.flr_label);
552 if (fl1) {
553 recheck:
554 err = -EEXIST;
555 if (freq.flr_flags&IPV6_FL_F_EXCL)
556 goto release;
557 err = -EPERM;
558 if (fl1->share == IPV6_FL_S_EXCL ||
559 fl1->share != fl->share ||
560 fl1->owner != fl->owner)
561 goto release;
562
563 err = -EINVAL;
564 if (!ipv6_addr_equal(&fl1->dst, &fl->dst) ||
565 ipv6_opt_cmp(fl1->opt, fl->opt))
566 goto release;
567
568 err = -ENOMEM;
569 if (sfl1 == NULL)
570 goto release;
571 if (fl->linger > fl1->linger)
572 fl1->linger = fl->linger;
573 if ((long)(fl->expires - fl1->expires) > 0)
574 fl1->expires = fl->expires;
575 fl_link(np, sfl1, fl1);
576 fl_free(fl);
577 return 0;
578
579 release:
580 fl_release(fl1);
581 goto done;
582 }
583 }
584 err = -ENOENT;
585 if (!(freq.flr_flags&IPV6_FL_F_CREATE))
586 goto done;
587
588 err = -ENOMEM;
589 if (sfl1 == NULL || (err = mem_check(sk)) != 0)
590 goto done;
591
592 fl1 = fl_intern(net, fl, freq.flr_label);
593 if (fl1 != NULL)
594 goto recheck;
595
596 if (!freq.flr_label) {
597 if (copy_to_user(&((struct in6_flowlabel_req __user *) optval)->flr_label,
598 &fl->label, sizeof(fl->label))) {
599 /* Intentionally ignore fault. */
600 }
601 }
602
603 fl_link(np, sfl1, fl);
604 return 0;
605
606 default:
607 return -EINVAL;
608 }
609
610 done:
611 fl_free(fl);
612 kfree(sfl1);
613 return err;
614 }
615
616 #ifdef CONFIG_PROC_FS
617
618 struct ip6fl_iter_state {
619 struct seq_net_private p;
620 int bucket;
621 };
622
623 #define ip6fl_seq_private(seq) ((struct ip6fl_iter_state *)(seq)->private)
624
625 static struct ip6_flowlabel *ip6fl_get_first(struct seq_file *seq)
626 {
627 struct ip6_flowlabel *fl = NULL;
628 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
629 struct net *net = seq_file_net(seq);
630
631 for (state->bucket = 0; state->bucket <= FL_HASH_MASK; ++state->bucket) {
632 fl = fl_ht[state->bucket];
633
634 while (fl && !net_eq(fl->fl_net, net))
635 fl = fl->next;
636 if (fl)
637 break;
638 }
639 return fl;
640 }
641
642 static struct ip6_flowlabel *ip6fl_get_next(struct seq_file *seq, struct ip6_flowlabel *fl)
643 {
644 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
645 struct net *net = seq_file_net(seq);
646
647 fl = fl->next;
648 try_again:
649 while (fl && !net_eq(fl->fl_net, net))
650 fl = fl->next;
651
652 while (!fl) {
653 if (++state->bucket <= FL_HASH_MASK) {
654 fl = fl_ht[state->bucket];
655 goto try_again;
656 } else
657 break;
658 }
659 return fl;
660 }
661
662 static struct ip6_flowlabel *ip6fl_get_idx(struct seq_file *seq, loff_t pos)
663 {
664 struct ip6_flowlabel *fl = ip6fl_get_first(seq);
665 if (fl)
666 while (pos && (fl = ip6fl_get_next(seq, fl)) != NULL)
667 --pos;
668 return pos ? NULL : fl;
669 }
670
671 static void *ip6fl_seq_start(struct seq_file *seq, loff_t *pos)
672 __acquires(ip6_fl_lock)
673 {
674 read_lock_bh(&ip6_fl_lock);
675 return *pos ? ip6fl_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
676 }
677
678 static void *ip6fl_seq_next(struct seq_file *seq, void *v, loff_t *pos)
679 {
680 struct ip6_flowlabel *fl;
681
682 if (v == SEQ_START_TOKEN)
683 fl = ip6fl_get_first(seq);
684 else
685 fl = ip6fl_get_next(seq, v);
686 ++*pos;
687 return fl;
688 }
689
690 static void ip6fl_seq_stop(struct seq_file *seq, void *v)
691 __releases(ip6_fl_lock)
692 {
693 read_unlock_bh(&ip6_fl_lock);
694 }
695
696 static int ip6fl_seq_show(struct seq_file *seq, void *v)
697 {
698 if (v == SEQ_START_TOKEN)
699 seq_printf(seq, "%-5s %-1s %-6s %-6s %-6s %-8s %-32s %s\n",
700 "Label", "S", "Owner", "Users", "Linger", "Expires", "Dst", "Opt");
701 else {
702 struct ip6_flowlabel *fl = v;
703 seq_printf(seq,
704 "%05X %-1d %-6d %-6d %-6ld %-8ld %pi6 %-4d\n",
705 (unsigned)ntohl(fl->label),
706 fl->share,
707 (unsigned)fl->owner,
708 atomic_read(&fl->users),
709 fl->linger/HZ,
710 (long)(fl->expires - jiffies)/HZ,
711 &fl->dst,
712 fl->opt ? fl->opt->opt_nflen : 0);
713 }
714 return 0;
715 }
716
717 static const struct seq_operations ip6fl_seq_ops = {
718 .start = ip6fl_seq_start,
719 .next = ip6fl_seq_next,
720 .stop = ip6fl_seq_stop,
721 .show = ip6fl_seq_show,
722 };
723
724 static int ip6fl_seq_open(struct inode *inode, struct file *file)
725 {
726 return seq_open_net(inode, file, &ip6fl_seq_ops,
727 sizeof(struct ip6fl_iter_state));
728 }
729
730 static const struct file_operations ip6fl_seq_fops = {
731 .owner = THIS_MODULE,
732 .open = ip6fl_seq_open,
733 .read = seq_read,
734 .llseek = seq_lseek,
735 .release = seq_release_net,
736 };
737
738 static int ip6_flowlabel_proc_init(struct net *net)
739 {
740 if (!proc_net_fops_create(net, "ip6_flowlabel",
741 S_IRUGO, &ip6fl_seq_fops))
742 return -ENOMEM;
743 return 0;
744 }
745
746 static void ip6_flowlabel_proc_fini(struct net *net)
747 {
748 proc_net_remove(net, "ip6_flowlabel");
749 }
750 #else
751 static inline int ip6_flowlabel_proc_init(struct net *net)
752 {
753 return 0;
754 }
755 static inline void ip6_flowlabel_proc_fini(struct net *net)
756 {
757 return ;
758 }
759 #endif
760
761 static inline void ip6_flowlabel_net_exit(struct net *net)
762 {
763 ip6_fl_purge(net);
764 ip6_flowlabel_proc_fini(net);
765 }
766
767 static struct pernet_operations ip6_flowlabel_net_ops = {
768 .init = ip6_flowlabel_proc_init,
769 .exit = ip6_flowlabel_net_exit,
770 };
771
772 int ip6_flowlabel_init(void)
773 {
774 return register_pernet_subsys(&ip6_flowlabel_net_ops);
775 }
776
777 void ip6_flowlabel_cleanup(void)
778 {
779 del_timer(&ip6_fl_gc_timer);
780 unregister_pernet_subsys(&ip6_flowlabel_net_ops);
781 }
Linus' kernel tree