Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/sparc-2.6
[linux-2.6.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/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/sock.h>
25
26 #include <net/ipv6.h>
27 #include <net/ndisc.h>
28 #include <net/protocol.h>
29 #include <net/ip6_route.h>
30 #include <net/addrconf.h>
31 #include <net/rawv6.h>
32 #include <net/icmp.h>
33 #include <net/transp_v6.h>
34
35 #include <asm/uaccess.h>
36
37 #define FL_MIN_LINGER   6       /* Minimal linger. It is set to 6sec specified
38                                    in old IPv6 RFC. Well, it was reasonable value.
39                                  */
40 #define FL_MAX_LINGER   60      /* Maximal linger timeout */
41
42 /* FL hash table */
43
44 #define FL_MAX_PER_SOCK 32
45 #define FL_MAX_SIZE     4096
46 #define FL_HASH_MASK    255
47 #define FL_HASH(l)      (ntohl(l)&FL_HASH_MASK)
48
49 static atomic_t fl_size = ATOMIC_INIT(0);
50 static struct ip6_flowlabel *fl_ht[FL_HASH_MASK+1];
51
52 static void ip6_fl_gc(unsigned long dummy);
53 static DEFINE_TIMER(ip6_fl_gc_timer, ip6_fl_gc, 0, 0);
54
55 /* FL hash table lock: it protects only of GC */
56
57 static DEFINE_RWLOCK(ip6_fl_lock);
58
59 /* Big socket sock */
60
61 static DEFINE_RWLOCK(ip6_sk_fl_lock);
62
63
64 static __inline__ struct ip6_flowlabel * __fl_lookup(u32 label)
65 {
66         struct ip6_flowlabel *fl;
67
68         for (fl=fl_ht[FL_HASH(label)]; fl; fl = fl->next) {
69                 if (fl->label == label)
70                         return fl;
71         }
72         return NULL;
73 }
74
75 static struct ip6_flowlabel * fl_lookup(u32 label)
76 {
77         struct ip6_flowlabel *fl;
78
79         read_lock_bh(&ip6_fl_lock);
80         fl = __fl_lookup(label);
81         if (fl)
82                 atomic_inc(&fl->users);
83         read_unlock_bh(&ip6_fl_lock);
84         return fl;
85 }
86
87
88 static void fl_free(struct ip6_flowlabel *fl)
89 {
90         if (fl)
91                 kfree(fl->opt);
92         kfree(fl);
93 }
94
95 static void fl_release(struct ip6_flowlabel *fl)
96 {
97         write_lock_bh(&ip6_fl_lock);
98
99         fl->lastuse = jiffies;
100         if (atomic_dec_and_test(&fl->users)) {
101                 unsigned long ttd = fl->lastuse + fl->linger;
102                 if (time_after(ttd, fl->expires))
103                         fl->expires = ttd;
104                 ttd = fl->expires;
105                 if (fl->opt && fl->share == IPV6_FL_S_EXCL) {
106                         struct ipv6_txoptions *opt = fl->opt;
107                         fl->opt = NULL;
108                         kfree(opt);
109                 }
110                 if (!timer_pending(&ip6_fl_gc_timer) ||
111                     time_after(ip6_fl_gc_timer.expires, ttd))
112                         mod_timer(&ip6_fl_gc_timer, ttd);
113         }
114
115         write_unlock_bh(&ip6_fl_lock);
116 }
117
118 static void ip6_fl_gc(unsigned long dummy)
119 {
120         int i;
121         unsigned long now = jiffies;
122         unsigned long sched = 0;
123
124         write_lock(&ip6_fl_lock);
125
126         for (i=0; i<=FL_HASH_MASK; i++) {
127                 struct ip6_flowlabel *fl, **flp;
128                 flp = &fl_ht[i];
129                 while ((fl=*flp) != NULL) {
130                         if (atomic_read(&fl->users) == 0) {
131                                 unsigned long ttd = fl->lastuse + fl->linger;
132                                 if (time_after(ttd, fl->expires))
133                                         fl->expires = ttd;
134                                 ttd = fl->expires;
135                                 if (time_after_eq(now, ttd)) {
136                                         *flp = fl->next;
137                                         fl_free(fl);
138                                         atomic_dec(&fl_size);
139                                         continue;
140                                 }
141                                 if (!sched || time_before(ttd, sched))
142                                         sched = ttd;
143                         }
144                         flp = &fl->next;
145                 }
146         }
147         if (!sched && atomic_read(&fl_size))
148                 sched = now + FL_MAX_LINGER;
149         if (sched) {
150                 ip6_fl_gc_timer.expires = sched;
151                 add_timer(&ip6_fl_gc_timer);
152         }
153         write_unlock(&ip6_fl_lock);
154 }
155
156 static int fl_intern(struct ip6_flowlabel *fl, __u32 label)
157 {
158         fl->label = label & IPV6_FLOWLABEL_MASK;
159
160         write_lock_bh(&ip6_fl_lock);
161         if (label == 0) {
162                 for (;;) {
163                         fl->label = htonl(net_random())&IPV6_FLOWLABEL_MASK;
164                         if (fl->label) {
165                                 struct ip6_flowlabel *lfl;
166                                 lfl = __fl_lookup(fl->label);
167                                 if (lfl == NULL)
168                                         break;
169                         }
170                 }
171         }
172
173         fl->lastuse = jiffies;
174         fl->next = fl_ht[FL_HASH(fl->label)];
175         fl_ht[FL_HASH(fl->label)] = fl;
176         atomic_inc(&fl_size);
177         write_unlock_bh(&ip6_fl_lock);
178         return 0;
179 }
180
181
182
183 /* Socket flowlabel lists */
184
185 struct ip6_flowlabel * fl6_sock_lookup(struct sock *sk, u32 label)
186 {
187         struct ipv6_fl_socklist *sfl;
188         struct ipv6_pinfo *np = inet6_sk(sk);
189
190         label &= IPV6_FLOWLABEL_MASK;
191
192         for (sfl=np->ipv6_fl_list; sfl; sfl = sfl->next) {
193                 struct ip6_flowlabel *fl = sfl->fl;
194                 if (fl->label == label) {
195                         fl->lastuse = jiffies;
196                         atomic_inc(&fl->users);
197                         return fl;
198                 }
199         }
200         return NULL;
201 }
202
203 EXPORT_SYMBOL_GPL(fl6_sock_lookup);
204
205 void fl6_free_socklist(struct sock *sk)
206 {
207         struct ipv6_pinfo *np = inet6_sk(sk);
208         struct ipv6_fl_socklist *sfl;
209
210         while ((sfl = np->ipv6_fl_list) != NULL) {
211                 np->ipv6_fl_list = sfl->next;
212                 fl_release(sfl->fl);
213                 kfree(sfl);
214         }
215 }
216
217 /* Service routines */
218
219
220 /*
221    It is the only difficult place. flowlabel enforces equal headers
222    before and including routing header, however user may supply options
223    following rthdr.
224  */
225
226 struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
227                                          struct ip6_flowlabel * fl,
228                                          struct ipv6_txoptions * fopt)
229 {
230         struct ipv6_txoptions * fl_opt = fl->opt;
231         
232         if (fopt == NULL || fopt->opt_flen == 0)
233                 return fl_opt;
234         
235         if (fl_opt != NULL) {
236                 opt_space->hopopt = fl_opt->hopopt;
237                 opt_space->dst0opt = fl_opt->dst0opt;
238                 opt_space->srcrt = fl_opt->srcrt;
239                 opt_space->opt_nflen = fl_opt->opt_nflen;
240         } else {
241                 if (fopt->opt_nflen == 0)
242                         return fopt;
243                 opt_space->hopopt = NULL;
244                 opt_space->dst0opt = NULL;
245                 opt_space->srcrt = NULL;
246                 opt_space->opt_nflen = 0;
247         }
248         opt_space->dst1opt = fopt->dst1opt;
249         opt_space->opt_flen = fopt->opt_flen;
250         return opt_space;
251 }
252
253 static unsigned long check_linger(unsigned long ttl)
254 {
255         if (ttl < FL_MIN_LINGER)
256                 return FL_MIN_LINGER*HZ;
257         if (ttl > FL_MAX_LINGER && !capable(CAP_NET_ADMIN))
258                 return 0;
259         return ttl*HZ;
260 }
261
262 static int fl6_renew(struct ip6_flowlabel *fl, unsigned long linger, unsigned long expires)
263 {
264         linger = check_linger(linger);
265         if (!linger)
266                 return -EPERM;
267         expires = check_linger(expires);
268         if (!expires)
269                 return -EPERM;
270         fl->lastuse = jiffies;
271         if (time_before(fl->linger, linger))
272                 fl->linger = linger;
273         if (time_before(expires, fl->linger))
274                 expires = fl->linger;
275         if (time_before(fl->expires, fl->lastuse + expires))
276                 fl->expires = fl->lastuse + expires;
277         return 0;
278 }
279
280 static struct ip6_flowlabel *
281 fl_create(struct in6_flowlabel_req *freq, char __user *optval, int optlen, int *err_p)
282 {
283         struct ip6_flowlabel *fl;
284         int olen;
285         int addr_type;
286         int err;
287
288         err = -ENOMEM;
289         fl = kzalloc(sizeof(*fl), GFP_KERNEL);
290         if (fl == NULL)
291                 goto done;
292
293         olen = optlen - CMSG_ALIGN(sizeof(*freq));
294         if (olen > 0) {
295                 struct msghdr msg;
296                 struct flowi flowi;
297                 int junk;
298
299                 err = -ENOMEM;
300                 fl->opt = kmalloc(sizeof(*fl->opt) + olen, GFP_KERNEL);
301                 if (fl->opt == NULL)
302                         goto done;
303
304                 memset(fl->opt, 0, sizeof(*fl->opt));
305                 fl->opt->tot_len = sizeof(*fl->opt) + olen;
306                 err = -EFAULT;
307                 if (copy_from_user(fl->opt+1, optval+CMSG_ALIGN(sizeof(*freq)), olen))
308                         goto done;
309
310                 msg.msg_controllen = olen;
311                 msg.msg_control = (void*)(fl->opt+1);
312                 flowi.oif = 0;
313
314                 err = datagram_send_ctl(&msg, &flowi, fl->opt, &junk, &junk);
315                 if (err)
316                         goto done;
317                 err = -EINVAL;
318                 if (fl->opt->opt_flen)
319                         goto done;
320                 if (fl->opt->opt_nflen == 0) {
321                         kfree(fl->opt);
322                         fl->opt = NULL;
323                 }
324         }
325
326         fl->expires = jiffies;
327         err = fl6_renew(fl, freq->flr_linger, freq->flr_expires);
328         if (err)
329                 goto done;
330         fl->share = freq->flr_share;
331         addr_type = ipv6_addr_type(&freq->flr_dst);
332         if ((addr_type&IPV6_ADDR_MAPPED)
333             || addr_type == IPV6_ADDR_ANY)
334                 goto done;
335         ipv6_addr_copy(&fl->dst, &freq->flr_dst);
336         atomic_set(&fl->users, 1);
337         switch (fl->share) {
338         case IPV6_FL_S_EXCL:
339         case IPV6_FL_S_ANY:
340                 break;
341         case IPV6_FL_S_PROCESS:
342                 fl->owner = current->pid;
343                 break;
344         case IPV6_FL_S_USER:
345                 fl->owner = current->euid;
346                 break;
347         default:
348                 err = -EINVAL;
349                 goto done;
350         }
351         return fl;
352
353 done:
354         fl_free(fl);
355         *err_p = err;
356         return NULL;
357 }
358
359 static int mem_check(struct sock *sk)
360 {
361         struct ipv6_pinfo *np = inet6_sk(sk);
362         struct ipv6_fl_socklist *sfl;
363         int room = FL_MAX_SIZE - atomic_read(&fl_size);
364         int count = 0;
365
366         if (room > FL_MAX_SIZE - FL_MAX_PER_SOCK)
367                 return 0;
368
369         for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next)
370                 count++;
371
372         if (room <= 0 ||
373             ((count >= FL_MAX_PER_SOCK ||
374              (count > 0 && room < FL_MAX_SIZE/2) || room < FL_MAX_SIZE/4)
375              && !capable(CAP_NET_ADMIN)))
376                 return -ENOBUFS;
377
378         return 0;
379 }
380
381 static int ipv6_hdr_cmp(struct ipv6_opt_hdr *h1, struct ipv6_opt_hdr *h2)
382 {
383         if (h1 == h2)
384                 return 0;
385         if (h1 == NULL || h2 == NULL)
386                 return 1;
387         if (h1->hdrlen != h2->hdrlen)
388                 return 1;
389         return memcmp(h1+1, h2+1, ((h1->hdrlen+1)<<3) - sizeof(*h1));
390 }
391
392 static int ipv6_opt_cmp(struct ipv6_txoptions *o1, struct ipv6_txoptions *o2)
393 {
394         if (o1 == o2)
395                 return 0;
396         if (o1 == NULL || o2 == NULL)
397                 return 1;
398         if (o1->opt_nflen != o2->opt_nflen)
399                 return 1;
400         if (ipv6_hdr_cmp(o1->hopopt, o2->hopopt))
401                 return 1;
402         if (ipv6_hdr_cmp(o1->dst0opt, o2->dst0opt))
403                 return 1;
404         if (ipv6_hdr_cmp((struct ipv6_opt_hdr *)o1->srcrt, (struct ipv6_opt_hdr *)o2->srcrt))
405                 return 1;
406         return 0;
407 }
408
409 int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen)
410 {
411         int err;
412         struct ipv6_pinfo *np = inet6_sk(sk);
413         struct in6_flowlabel_req freq;
414         struct ipv6_fl_socklist *sfl1=NULL;
415         struct ipv6_fl_socklist *sfl, **sflp;
416         struct ip6_flowlabel *fl;
417
418         if (optlen < sizeof(freq))
419                 return -EINVAL;
420
421         if (copy_from_user(&freq, optval, sizeof(freq)))
422                 return -EFAULT;
423
424         switch (freq.flr_action) {
425         case IPV6_FL_A_PUT:
426                 write_lock_bh(&ip6_sk_fl_lock);
427                 for (sflp = &np->ipv6_fl_list; (sfl=*sflp)!=NULL; sflp = &sfl->next) {
428                         if (sfl->fl->label == freq.flr_label) {
429                                 if (freq.flr_label == (np->flow_label&IPV6_FLOWLABEL_MASK))
430                                         np->flow_label &= ~IPV6_FLOWLABEL_MASK;
431                                 *sflp = sfl->next;
432                                 write_unlock_bh(&ip6_sk_fl_lock);
433                                 fl_release(sfl->fl);
434                                 kfree(sfl);
435                                 return 0;
436                         }
437                 }
438                 write_unlock_bh(&ip6_sk_fl_lock);
439                 return -ESRCH;
440
441         case IPV6_FL_A_RENEW:
442                 read_lock_bh(&ip6_sk_fl_lock);
443                 for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) {
444                         if (sfl->fl->label == freq.flr_label) {
445                                 err = fl6_renew(sfl->fl, freq.flr_linger, freq.flr_expires);
446                                 read_unlock_bh(&ip6_sk_fl_lock);
447                                 return err;
448                         }
449                 }
450                 read_unlock_bh(&ip6_sk_fl_lock);
451
452                 if (freq.flr_share == IPV6_FL_S_NONE && capable(CAP_NET_ADMIN)) {
453                         fl = fl_lookup(freq.flr_label);
454                         if (fl) {
455                                 err = fl6_renew(fl, freq.flr_linger, freq.flr_expires);
456                                 fl_release(fl);
457                                 return err;
458                         }
459                 }
460                 return -ESRCH;
461
462         case IPV6_FL_A_GET:
463                 if (freq.flr_label & ~IPV6_FLOWLABEL_MASK)
464                         return -EINVAL;
465
466                 fl = fl_create(&freq, optval, optlen, &err);
467                 if (fl == NULL)
468                         return err;
469                 sfl1 = kmalloc(sizeof(*sfl1), GFP_KERNEL);
470
471                 if (freq.flr_label) {
472                         struct ip6_flowlabel *fl1 = NULL;
473
474                         err = -EEXIST;
475                         read_lock_bh(&ip6_sk_fl_lock);
476                         for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) {
477                                 if (sfl->fl->label == freq.flr_label) {
478                                         if (freq.flr_flags&IPV6_FL_F_EXCL) {
479                                                 read_unlock_bh(&ip6_sk_fl_lock);
480                                                 goto done;
481                                         }
482                                         fl1 = sfl->fl;
483                                         atomic_inc(&fl1->users);
484                                         break;
485                                 }
486                         }
487                         read_unlock_bh(&ip6_sk_fl_lock);
488
489                         if (fl1 == NULL)
490                                 fl1 = fl_lookup(freq.flr_label);
491                         if (fl1) {
492                                 err = -EEXIST;
493                                 if (freq.flr_flags&IPV6_FL_F_EXCL)
494                                         goto release;
495                                 err = -EPERM;
496                                 if (fl1->share == IPV6_FL_S_EXCL ||
497                                     fl1->share != fl->share ||
498                                     fl1->owner != fl->owner)
499                                         goto release;
500
501                                 err = -EINVAL;
502                                 if (!ipv6_addr_equal(&fl1->dst, &fl->dst) ||
503                                     ipv6_opt_cmp(fl1->opt, fl->opt))
504                                         goto release;
505
506                                 err = -ENOMEM;
507                                 if (sfl1 == NULL)
508                                         goto release;
509                                 if (fl->linger > fl1->linger)
510                                         fl1->linger = fl->linger;
511                                 if ((long)(fl->expires - fl1->expires) > 0)
512                                         fl1->expires = fl->expires;
513                                 write_lock_bh(&ip6_sk_fl_lock);
514                                 sfl1->fl = fl1;
515                                 sfl1->next = np->ipv6_fl_list;
516                                 np->ipv6_fl_list = sfl1;
517                                 write_unlock_bh(&ip6_sk_fl_lock);
518                                 fl_free(fl);
519                                 return 0;
520
521 release:
522                                 fl_release(fl1);
523                                 goto done;
524                         }
525                 }
526                 err = -ENOENT;
527                 if (!(freq.flr_flags&IPV6_FL_F_CREATE))
528                         goto done;
529
530                 err = -ENOMEM;
531                 if (sfl1 == NULL || (err = mem_check(sk)) != 0)
532                         goto done;
533
534                 err = fl_intern(fl, freq.flr_label);
535                 if (err)
536                         goto done;
537
538                 if (!freq.flr_label) {
539                         if (copy_to_user(&((struct in6_flowlabel_req __user *) optval)->flr_label,
540                                          &fl->label, sizeof(fl->label))) {
541                                 /* Intentionally ignore fault. */
542                         }
543                 }
544
545                 sfl1->fl = fl;
546                 sfl1->next = np->ipv6_fl_list;
547                 np->ipv6_fl_list = sfl1;
548                 return 0;
549
550         default:
551                 return -EINVAL;
552         }
553
554 done:
555         fl_free(fl);
556         kfree(sfl1);
557         return err;
558 }
559
560 #ifdef CONFIG_PROC_FS
561
562 struct ip6fl_iter_state {
563         int bucket;
564 };
565
566 #define ip6fl_seq_private(seq)  ((struct ip6fl_iter_state *)(seq)->private)
567
568 static struct ip6_flowlabel *ip6fl_get_first(struct seq_file *seq)
569 {
570         struct ip6_flowlabel *fl = NULL;
571         struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
572
573         for (state->bucket = 0; state->bucket <= FL_HASH_MASK; ++state->bucket) {
574                 if (fl_ht[state->bucket]) {
575                         fl = fl_ht[state->bucket];
576                         break;
577                 }
578         }
579         return fl;
580 }
581
582 static struct ip6_flowlabel *ip6fl_get_next(struct seq_file *seq, struct ip6_flowlabel *fl)
583 {
584         struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
585
586         fl = fl->next;
587         while (!fl) {
588                 if (++state->bucket <= FL_HASH_MASK)
589                         fl = fl_ht[state->bucket];
590         }
591         return fl;
592 }
593
594 static struct ip6_flowlabel *ip6fl_get_idx(struct seq_file *seq, loff_t pos)
595 {
596         struct ip6_flowlabel *fl = ip6fl_get_first(seq);
597         if (fl)
598                 while (pos && (fl = ip6fl_get_next(seq, fl)) != NULL)
599                         --pos;
600         return pos ? NULL : fl;
601 }
602
603 static void *ip6fl_seq_start(struct seq_file *seq, loff_t *pos)
604 {
605         read_lock_bh(&ip6_fl_lock);
606         return *pos ? ip6fl_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
607 }
608
609 static void *ip6fl_seq_next(struct seq_file *seq, void *v, loff_t *pos)
610 {
611         struct ip6_flowlabel *fl;
612
613         if (v == SEQ_START_TOKEN)
614                 fl = ip6fl_get_first(seq);
615         else
616                 fl = ip6fl_get_next(seq, v);
617         ++*pos;
618         return fl;
619 }
620
621 static void ip6fl_seq_stop(struct seq_file *seq, void *v)
622 {
623         read_unlock_bh(&ip6_fl_lock);
624 }
625
626 static void ip6fl_fl_seq_show(struct seq_file *seq, struct ip6_flowlabel *fl)
627 {
628         while(fl) {
629                 seq_printf(seq,
630                            "%05X %-1d %-6d %-6d %-6ld %-8ld " NIP6_SEQFMT " %-4d\n",
631                            (unsigned)ntohl(fl->label),
632                            fl->share,
633                            (unsigned)fl->owner,
634                            atomic_read(&fl->users),
635                            fl->linger/HZ,
636                            (long)(fl->expires - jiffies)/HZ,
637                            NIP6(fl->dst),
638                            fl->opt ? fl->opt->opt_nflen : 0);
639                 fl = fl->next;
640         }
641 }
642
643 static int ip6fl_seq_show(struct seq_file *seq, void *v)
644 {
645         if (v == SEQ_START_TOKEN)
646                 seq_printf(seq, "%-5s %-1s %-6s %-6s %-6s %-8s %-32s %s\n",
647                            "Label", "S", "Owner", "Users", "Linger", "Expires", "Dst", "Opt");
648         else
649                 ip6fl_fl_seq_show(seq, v);
650         return 0;
651 }
652
653 static struct seq_operations ip6fl_seq_ops = {
654         .start  =       ip6fl_seq_start,
655         .next   =       ip6fl_seq_next,
656         .stop   =       ip6fl_seq_stop,
657         .show   =       ip6fl_seq_show,
658 };
659
660 static int ip6fl_seq_open(struct inode *inode, struct file *file)
661 {
662         struct seq_file *seq;
663         int rc = -ENOMEM;
664         struct ip6fl_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
665
666         if (!s)
667                 goto out;
668
669         rc = seq_open(file, &ip6fl_seq_ops);
670         if (rc)
671                 goto out_kfree;
672
673         seq = file->private_data;
674         seq->private = s;
675 out:
676         return rc;
677 out_kfree:
678         kfree(s);
679         goto out;
680 }
681
682 static struct file_operations ip6fl_seq_fops = {
683         .owner          =       THIS_MODULE,
684         .open           =       ip6fl_seq_open,
685         .read           =       seq_read,
686         .llseek         =       seq_lseek,
687         .release        =       seq_release_private,
688 };
689 #endif
690
691
692 void ip6_flowlabel_init(void)
693 {
694 #ifdef CONFIG_PROC_FS
695         proc_net_fops_create("ip6_flowlabel", S_IRUGO, &ip6fl_seq_fops);
696 #endif
697 }
698
699 void ip6_flowlabel_cleanup(void)
700 {
701         del_timer(&ip6_fl_gc_timer);
702 #ifdef CONFIG_PROC_FS
703         proc_net_remove("ip6_flowlabel");
704 #endif
705 }