Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6
[linux-2.6] / 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/config.h>
14 #include <linux/errno.h>
15 #include <linux/types.h>
16 #include <linux/socket.h>
17 #include <linux/net.h>
18 #include <linux/netdevice.h>
19 #include <linux/if_arp.h>
20 #include <linux/in6.h>
21 #include <linux/route.h>
22 #include <linux/proc_fs.h>
23 #include <linux/seq_file.h>
24
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(u32 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)
71                         return fl;
72         }
73         return NULL;
74 }
75
76 static struct ip6_flowlabel * fl_lookup(u32 label)
77 {
78         struct ip6_flowlabel *fl;
79
80         read_lock_bh(&ip6_fl_lock);
81         fl = __fl_lookup(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                 kfree(fl->opt);
93         kfree(fl);
94 }
95
96 static void fl_release(struct ip6_flowlabel *fl)
97 {
98         write_lock_bh(&ip6_fl_lock);
99
100         fl->lastuse = jiffies;
101         if (atomic_dec_and_test(&fl->users)) {
102                 unsigned long ttd = fl->lastuse + fl->linger;
103                 if (time_after(ttd, fl->expires))
104                         fl->expires = ttd;
105                 ttd = fl->expires;
106                 if (fl->opt && fl->share == IPV6_FL_S_EXCL) {
107                         struct ipv6_txoptions *opt = fl->opt;
108                         fl->opt = NULL;
109                         kfree(opt);
110                 }
111                 if (!timer_pending(&ip6_fl_gc_timer) ||
112                     time_after(ip6_fl_gc_timer.expires, ttd))
113                         mod_timer(&ip6_fl_gc_timer, ttd);
114         }
115
116         write_unlock_bh(&ip6_fl_lock);
117 }
118
119 static void ip6_fl_gc(unsigned long dummy)
120 {
121         int i;
122         unsigned long now = jiffies;
123         unsigned long sched = 0;
124
125         write_lock(&ip6_fl_lock);
126
127         for (i=0; i<=FL_HASH_MASK; i++) {
128                 struct ip6_flowlabel *fl, **flp;
129                 flp = &fl_ht[i];
130                 while ((fl=*flp) != NULL) {
131                         if (atomic_read(&fl->users) == 0) {
132                                 unsigned long ttd = fl->lastuse + fl->linger;
133                                 if (time_after(ttd, fl->expires))
134                                         fl->expires = ttd;
135                                 ttd = fl->expires;
136                                 if (time_after_eq(now, ttd)) {
137                                         *flp = fl->next;
138                                         fl_free(fl);
139                                         atomic_dec(&fl_size);
140                                         continue;
141                                 }
142                                 if (!sched || time_before(ttd, sched))
143                                         sched = ttd;
144                         }
145                         flp = &fl->next;
146                 }
147         }
148         if (!sched && atomic_read(&fl_size))
149                 sched = now + FL_MAX_LINGER;
150         if (sched) {
151                 ip6_fl_gc_timer.expires = sched;
152                 add_timer(&ip6_fl_gc_timer);
153         }
154         write_unlock(&ip6_fl_lock);
155 }
156
157 static int fl_intern(struct ip6_flowlabel *fl, __u32 label)
158 {
159         fl->label = label & IPV6_FLOWLABEL_MASK;
160
161         write_lock_bh(&ip6_fl_lock);
162         if (label == 0) {
163                 for (;;) {
164                         fl->label = htonl(net_random())&IPV6_FLOWLABEL_MASK;
165                         if (fl->label) {
166                                 struct ip6_flowlabel *lfl;
167                                 lfl = __fl_lookup(fl->label);
168                                 if (lfl == NULL)
169                                         break;
170                         }
171                 }
172         }
173
174         fl->lastuse = jiffies;
175         fl->next = fl_ht[FL_HASH(fl->label)];
176         fl_ht[FL_HASH(fl->label)] = fl;
177         atomic_inc(&fl_size);
178         write_unlock_bh(&ip6_fl_lock);
179         return 0;
180 }
181
182
183
184 /* Socket flowlabel lists */
185
186 struct ip6_flowlabel * fl6_sock_lookup(struct sock *sk, u32 label)
187 {
188         struct ipv6_fl_socklist *sfl;
189         struct ipv6_pinfo *np = inet6_sk(sk);
190
191         label &= IPV6_FLOWLABEL_MASK;
192
193         for (sfl=np->ipv6_fl_list; sfl; sfl = sfl->next) {
194                 struct ip6_flowlabel *fl = sfl->fl;
195                 if (fl->label == label) {
196                         fl->lastuse = jiffies;
197                         atomic_inc(&fl->users);
198                         return fl;
199                 }
200         }
201         return NULL;
202 }
203
204 EXPORT_SYMBOL_GPL(fl6_sock_lookup);
205
206 void fl6_free_socklist(struct sock *sk)
207 {
208         struct ipv6_pinfo *np = inet6_sk(sk);
209         struct ipv6_fl_socklist *sfl;
210
211         while ((sfl = np->ipv6_fl_list) != NULL) {
212                 np->ipv6_fl_list = sfl->next;
213                 fl_release(sfl->fl);
214                 kfree(sfl);
215         }
216 }
217
218 /* Service routines */
219
220
221 /*
222    It is the only difficult place. flowlabel enforces equal headers
223    before and including routing header, however user may supply options
224    following rthdr.
225  */
226
227 struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
228                                          struct ip6_flowlabel * fl,
229                                          struct ipv6_txoptions * fopt)
230 {
231         struct ipv6_txoptions * fl_opt = fl->opt;
232         
233         if (fopt == NULL || fopt->opt_flen == 0)
234                 return fl_opt;
235         
236         if (fl_opt != NULL) {
237                 opt_space->hopopt = fl_opt->hopopt;
238                 opt_space->dst0opt = fl_opt->dst0opt;
239                 opt_space->srcrt = fl_opt->srcrt;
240                 opt_space->opt_nflen = fl_opt->opt_nflen;
241         } else {
242                 if (fopt->opt_nflen == 0)
243                         return fopt;
244                 opt_space->hopopt = NULL;
245                 opt_space->dst0opt = NULL;
246                 opt_space->srcrt = NULL;
247                 opt_space->opt_nflen = 0;
248         }
249         opt_space->dst1opt = fopt->dst1opt;
250         opt_space->opt_flen = fopt->opt_flen;
251         return opt_space;
252 }
253
254 static unsigned long check_linger(unsigned long ttl)
255 {
256         if (ttl < FL_MIN_LINGER)
257                 return FL_MIN_LINGER*HZ;
258         if (ttl > FL_MAX_LINGER && !capable(CAP_NET_ADMIN))
259                 return 0;
260         return ttl*HZ;
261 }
262
263 static int fl6_renew(struct ip6_flowlabel *fl, unsigned long linger, unsigned long expires)
264 {
265         linger = check_linger(linger);
266         if (!linger)
267                 return -EPERM;
268         expires = check_linger(expires);
269         if (!expires)
270                 return -EPERM;
271         fl->lastuse = jiffies;
272         if (time_before(fl->linger, linger))
273                 fl->linger = linger;
274         if (time_before(expires, fl->linger))
275                 expires = fl->linger;
276         if (time_before(fl->expires, fl->lastuse + expires))
277                 fl->expires = fl->lastuse + expires;
278         return 0;
279 }
280
281 static struct ip6_flowlabel *
282 fl_create(struct in6_flowlabel_req *freq, char __user *optval, int optlen, int *err_p)
283 {
284         struct ip6_flowlabel *fl;
285         int olen;
286         int addr_type;
287         int err;
288
289         err = -ENOMEM;
290         fl = kmalloc(sizeof(*fl), GFP_KERNEL);
291         if (fl == NULL)
292                 goto done;
293         memset(fl, 0, sizeof(*fl));
294
295         olen = optlen - CMSG_ALIGN(sizeof(*freq));
296         if (olen > 0) {
297                 struct msghdr msg;
298                 struct flowi flowi;
299                 int junk;
300
301                 err = -ENOMEM;
302                 fl->opt = kmalloc(sizeof(*fl->opt) + olen, GFP_KERNEL);
303                 if (fl->opt == NULL)
304                         goto done;
305
306                 memset(fl->opt, 0, sizeof(*fl->opt));
307                 fl->opt->tot_len = sizeof(*fl->opt) + olen;
308                 err = -EFAULT;
309                 if (copy_from_user(fl->opt+1, optval+CMSG_ALIGN(sizeof(*freq)), olen))
310                         goto done;
311
312                 msg.msg_controllen = olen;
313                 msg.msg_control = (void*)(fl->opt+1);
314                 flowi.oif = 0;
315
316                 err = datagram_send_ctl(&msg, &flowi, fl->opt, &junk, &junk);
317                 if (err)
318                         goto done;
319                 err = -EINVAL;
320                 if (fl->opt->opt_flen)
321                         goto done;
322                 if (fl->opt->opt_nflen == 0) {
323                         kfree(fl->opt);
324                         fl->opt = NULL;
325                 }
326         }
327
328         fl->expires = jiffies;
329         err = fl6_renew(fl, freq->flr_linger, freq->flr_expires);
330         if (err)
331                 goto done;
332         fl->share = freq->flr_share;
333         addr_type = ipv6_addr_type(&freq->flr_dst);
334         if ((addr_type&IPV6_ADDR_MAPPED)
335             || addr_type == IPV6_ADDR_ANY)
336                 goto done;
337         ipv6_addr_copy(&fl->dst, &freq->flr_dst);
338         atomic_set(&fl->users, 1);
339         switch (fl->share) {
340         case IPV6_FL_S_EXCL:
341         case IPV6_FL_S_ANY:
342                 break;
343         case IPV6_FL_S_PROCESS:
344                 fl->owner = current->pid;
345                 break;
346         case IPV6_FL_S_USER:
347                 fl->owner = current->euid;
348                 break;
349         default:
350                 err = -EINVAL;
351                 goto done;
352         }
353         return fl;
354
355 done:
356         fl_free(fl);
357         *err_p = err;
358         return NULL;
359 }
360
361 static int mem_check(struct sock *sk)
362 {
363         struct ipv6_pinfo *np = inet6_sk(sk);
364         struct ipv6_fl_socklist *sfl;
365         int room = FL_MAX_SIZE - atomic_read(&fl_size);
366         int count = 0;
367
368         if (room > FL_MAX_SIZE - FL_MAX_PER_SOCK)
369                 return 0;
370
371         for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next)
372                 count++;
373
374         if (room <= 0 ||
375             ((count >= FL_MAX_PER_SOCK ||
376              (count > 0 && room < FL_MAX_SIZE/2) || room < FL_MAX_SIZE/4)
377              && !capable(CAP_NET_ADMIN)))
378                 return -ENOBUFS;
379
380         return 0;
381 }
382
383 static int ipv6_hdr_cmp(struct ipv6_opt_hdr *h1, struct ipv6_opt_hdr *h2)
384 {
385         if (h1 == h2)
386                 return 0;
387         if (h1 == NULL || h2 == NULL)
388                 return 1;
389         if (h1->hdrlen != h2->hdrlen)
390                 return 1;
391         return memcmp(h1+1, h2+1, ((h1->hdrlen+1)<<3) - sizeof(*h1));
392 }
393
394 static int ipv6_opt_cmp(struct ipv6_txoptions *o1, struct ipv6_txoptions *o2)
395 {
396         if (o1 == o2)
397                 return 0;
398         if (o1 == NULL || o2 == NULL)
399                 return 1;
400         if (o1->opt_nflen != o2->opt_nflen)
401                 return 1;
402         if (ipv6_hdr_cmp(o1->hopopt, o2->hopopt))
403                 return 1;
404         if (ipv6_hdr_cmp(o1->dst0opt, o2->dst0opt))
405                 return 1;
406         if (ipv6_hdr_cmp((struct ipv6_opt_hdr *)o1->srcrt, (struct ipv6_opt_hdr *)o2->srcrt))
407                 return 1;
408         return 0;
409 }
410
411 int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen)
412 {
413         int err;
414         struct ipv6_pinfo *np = inet6_sk(sk);
415         struct in6_flowlabel_req freq;
416         struct ipv6_fl_socklist *sfl1=NULL;
417         struct ipv6_fl_socklist *sfl, **sflp;
418         struct ip6_flowlabel *fl;
419
420         if (optlen < sizeof(freq))
421                 return -EINVAL;
422
423         if (copy_from_user(&freq, optval, sizeof(freq)))
424                 return -EFAULT;
425
426         switch (freq.flr_action) {
427         case IPV6_FL_A_PUT:
428                 write_lock_bh(&ip6_sk_fl_lock);
429                 for (sflp = &np->ipv6_fl_list; (sfl=*sflp)!=NULL; sflp = &sfl->next) {
430                         if (sfl->fl->label == freq.flr_label) {
431                                 if (freq.flr_label == (np->flow_label&IPV6_FLOWLABEL_MASK))
432                                         np->flow_label &= ~IPV6_FLOWLABEL_MASK;
433                                 *sflp = sfl->next;
434                                 write_unlock_bh(&ip6_sk_fl_lock);
435                                 fl_release(sfl->fl);
436                                 kfree(sfl);
437                                 return 0;
438                         }
439                 }
440                 write_unlock_bh(&ip6_sk_fl_lock);
441                 return -ESRCH;
442
443         case IPV6_FL_A_RENEW:
444                 read_lock_bh(&ip6_sk_fl_lock);
445                 for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) {
446                         if (sfl->fl->label == freq.flr_label) {
447                                 err = fl6_renew(sfl->fl, freq.flr_linger, freq.flr_expires);
448                                 read_unlock_bh(&ip6_sk_fl_lock);
449                                 return err;
450                         }
451                 }
452                 read_unlock_bh(&ip6_sk_fl_lock);
453
454                 if (freq.flr_share == IPV6_FL_S_NONE && capable(CAP_NET_ADMIN)) {
455                         fl = fl_lookup(freq.flr_label);
456                         if (fl) {
457                                 err = fl6_renew(fl, freq.flr_linger, freq.flr_expires);
458                                 fl_release(fl);
459                                 return err;
460                         }
461                 }
462                 return -ESRCH;
463
464         case IPV6_FL_A_GET:
465                 if (freq.flr_label & ~IPV6_FLOWLABEL_MASK)
466                         return -EINVAL;
467
468                 fl = fl_create(&freq, optval, optlen, &err);
469                 if (fl == NULL)
470                         return err;
471                 sfl1 = kmalloc(sizeof(*sfl1), GFP_KERNEL);
472
473                 if (freq.flr_label) {
474                         struct ip6_flowlabel *fl1 = NULL;
475
476                         err = -EEXIST;
477                         read_lock_bh(&ip6_sk_fl_lock);
478                         for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) {
479                                 if (sfl->fl->label == freq.flr_label) {
480                                         if (freq.flr_flags&IPV6_FL_F_EXCL) {
481                                                 read_unlock_bh(&ip6_sk_fl_lock);
482                                                 goto done;
483                                         }
484                                         fl1 = sfl->fl;
485                                         atomic_inc(&fl1->users);
486                                         break;
487                                 }
488                         }
489                         read_unlock_bh(&ip6_sk_fl_lock);
490
491                         if (fl1 == NULL)
492                                 fl1 = fl_lookup(freq.flr_label);
493                         if (fl1) {
494                                 err = -EEXIST;
495                                 if (freq.flr_flags&IPV6_FL_F_EXCL)
496                                         goto release;
497                                 err = -EPERM;
498                                 if (fl1->share == IPV6_FL_S_EXCL ||
499                                     fl1->share != fl->share ||
500                                     fl1->owner != fl->owner)
501                                         goto release;
502
503                                 err = -EINVAL;
504                                 if (!ipv6_addr_equal(&fl1->dst, &fl->dst) ||
505                                     ipv6_opt_cmp(fl1->opt, fl->opt))
506                                         goto release;
507
508                                 err = -ENOMEM;
509                                 if (sfl1 == NULL)
510                                         goto release;
511                                 if (fl->linger > fl1->linger)
512                                         fl1->linger = fl->linger;
513                                 if ((long)(fl->expires - fl1->expires) > 0)
514                                         fl1->expires = fl->expires;
515                                 write_lock_bh(&ip6_sk_fl_lock);
516                                 sfl1->fl = fl1;
517                                 sfl1->next = np->ipv6_fl_list;
518                                 np->ipv6_fl_list = sfl1;
519                                 write_unlock_bh(&ip6_sk_fl_lock);
520                                 fl_free(fl);
521                                 return 0;
522
523 release:
524                                 fl_release(fl1);
525                                 goto done;
526                         }
527                 }
528                 err = -ENOENT;
529                 if (!(freq.flr_flags&IPV6_FL_F_CREATE))
530                         goto done;
531
532                 err = -ENOMEM;
533                 if (sfl1 == NULL || (err = mem_check(sk)) != 0)
534                         goto done;
535
536                 err = fl_intern(fl, freq.flr_label);
537                 if (err)
538                         goto done;
539
540                 if (!freq.flr_label) {
541                         if (copy_to_user(&((struct in6_flowlabel_req __user *) optval)->flr_label,
542                                          &fl->label, sizeof(fl->label))) {
543                                 /* Intentionally ignore fault. */
544                         }
545                 }
546
547                 sfl1->fl = fl;
548                 sfl1->next = np->ipv6_fl_list;
549                 np->ipv6_fl_list = sfl1;
550                 return 0;
551
552         default:
553                 return -EINVAL;
554         }
555
556 done:
557         fl_free(fl);
558         kfree(sfl1);
559         return err;
560 }
561
562 #ifdef CONFIG_PROC_FS
563
564 struct ip6fl_iter_state {
565         int bucket;
566 };
567
568 #define ip6fl_seq_private(seq)  ((struct ip6fl_iter_state *)(seq)->private)
569
570 static struct ip6_flowlabel *ip6fl_get_first(struct seq_file *seq)
571 {
572         struct ip6_flowlabel *fl = NULL;
573         struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
574
575         for (state->bucket = 0; state->bucket <= FL_HASH_MASK; ++state->bucket) {
576                 if (fl_ht[state->bucket]) {
577                         fl = fl_ht[state->bucket];
578                         break;
579                 }
580         }
581         return fl;
582 }
583
584 static struct ip6_flowlabel *ip6fl_get_next(struct seq_file *seq, struct ip6_flowlabel *fl)
585 {
586         struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
587
588         fl = fl->next;
589         while (!fl) {
590                 if (++state->bucket <= FL_HASH_MASK)
591                         fl = fl_ht[state->bucket];
592         }
593         return fl;
594 }
595
596 static struct ip6_flowlabel *ip6fl_get_idx(struct seq_file *seq, loff_t pos)
597 {
598         struct ip6_flowlabel *fl = ip6fl_get_first(seq);
599         if (fl)
600                 while (pos && (fl = ip6fl_get_next(seq, fl)) != NULL)
601                         --pos;
602         return pos ? NULL : fl;
603 }
604
605 static void *ip6fl_seq_start(struct seq_file *seq, loff_t *pos)
606 {
607         read_lock_bh(&ip6_fl_lock);
608         return *pos ? ip6fl_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
609 }
610
611 static void *ip6fl_seq_next(struct seq_file *seq, void *v, loff_t *pos)
612 {
613         struct ip6_flowlabel *fl;
614
615         if (v == SEQ_START_TOKEN)
616                 fl = ip6fl_get_first(seq);
617         else
618                 fl = ip6fl_get_next(seq, v);
619         ++*pos;
620         return fl;
621 }
622
623 static void ip6fl_seq_stop(struct seq_file *seq, void *v)
624 {
625         read_unlock_bh(&ip6_fl_lock);
626 }
627
628 static void ip6fl_fl_seq_show(struct seq_file *seq, struct ip6_flowlabel *fl)
629 {
630         while(fl) {
631                 seq_printf(seq,
632                            "%05X %-1d %-6d %-6d %-6ld %-8ld " NIP6_SEQFMT " %-4d\n",
633                            (unsigned)ntohl(fl->label),
634                            fl->share,
635                            (unsigned)fl->owner,
636                            atomic_read(&fl->users),
637                            fl->linger/HZ,
638                            (long)(fl->expires - jiffies)/HZ,
639                            NIP6(fl->dst),
640                            fl->opt ? fl->opt->opt_nflen : 0);
641                 fl = fl->next;
642         }
643 }
644
645 static int ip6fl_seq_show(struct seq_file *seq, void *v)
646 {
647         if (v == SEQ_START_TOKEN)
648                 seq_printf(seq, "%-5s %-1s %-6s %-6s %-6s %-8s %-32s %s\n",
649                            "Label", "S", "Owner", "Users", "Linger", "Expires", "Dst", "Opt");
650         else
651                 ip6fl_fl_seq_show(seq, v);
652         return 0;
653 }
654
655 static struct seq_operations ip6fl_seq_ops = {
656         .start  =       ip6fl_seq_start,
657         .next   =       ip6fl_seq_next,
658         .stop   =       ip6fl_seq_stop,
659         .show   =       ip6fl_seq_show,
660 };
661
662 static int ip6fl_seq_open(struct inode *inode, struct file *file)
663 {
664         struct seq_file *seq;
665         int rc = -ENOMEM;
666         struct ip6fl_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
667
668         if (!s)
669                 goto out;
670
671         rc = seq_open(file, &ip6fl_seq_ops);
672         if (rc)
673                 goto out_kfree;
674
675         seq = file->private_data;
676         seq->private = s;
677         memset(s, 0, sizeof(*s));
678 out:
679         return rc;
680 out_kfree:
681         kfree(s);
682         goto out;
683 }
684
685 static struct file_operations ip6fl_seq_fops = {
686         .owner          =       THIS_MODULE,
687         .open           =       ip6fl_seq_open,
688         .read           =       seq_read,
689         .llseek         =       seq_lseek,
690         .release        =       seq_release_private,
691 };
692 #endif
693
694
695 void ip6_flowlabel_init(void)
696 {
697 #ifdef CONFIG_PROC_FS
698         proc_net_fops_create("ip6_flowlabel", S_IRUGO, &ip6fl_seq_fops);
699 #endif
700 }
701
702 void ip6_flowlabel_cleanup(void)
703 {
704         del_timer(&ip6_fl_gc_timer);
705 #ifdef CONFIG_PROC_FS
706         proc_net_remove("ip6_flowlabel");
707 #endif
708 }