Merge /spare/repo/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/config.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 void fl6_free_socklist(struct sock *sk)
204 {
205         struct ipv6_pinfo *np = inet6_sk(sk);
206         struct ipv6_fl_socklist *sfl;
207
208         while ((sfl = np->ipv6_fl_list) != NULL) {
209                 np->ipv6_fl_list = sfl->next;
210                 fl_release(sfl->fl);
211                 kfree(sfl);
212         }
213 }
214
215 /* Service routines */
216
217
218 /*
219    It is the only difficult place. flowlabel enforces equal headers
220    before and including routing header, however user may supply options
221    following rthdr.
222  */
223
224 struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
225                                          struct ip6_flowlabel * fl,
226                                          struct ipv6_txoptions * fopt)
227 {
228         struct ipv6_txoptions * fl_opt = fl ? fl->opt : NULL;
229
230         if (fopt == NULL || fopt->opt_flen == 0) {
231                 if (!fl_opt || !fl_opt->dst0opt || fl_opt->srcrt)
232                         return fl_opt;
233         }
234
235         if (fl_opt != NULL) {
236                 opt_space->hopopt = fl_opt->hopopt;
237                 opt_space->dst0opt = fl_opt->srcrt ? fl_opt->dst0opt : NULL;
238                 opt_space->srcrt = fl_opt->srcrt;
239                 opt_space->opt_nflen = fl_opt->opt_nflen;
240                 if (fl_opt->dst0opt && !fl_opt->srcrt)
241                         opt_space->opt_nflen -= ipv6_optlen(fl_opt->dst0opt);
242         } else {
243                 if (fopt->opt_nflen == 0)
244                         return fopt;
245                 opt_space->hopopt = NULL;
246                 opt_space->dst0opt = NULL;
247                 opt_space->srcrt = NULL;
248                 opt_space->opt_nflen = 0;
249         }
250         opt_space->dst1opt = fopt->dst1opt;
251         opt_space->opt_flen = fopt->opt_flen;
252         return opt_space;
253 }
254
255 static unsigned long check_linger(unsigned long ttl)
256 {
257         if (ttl < FL_MIN_LINGER)
258                 return FL_MIN_LINGER*HZ;
259         if (ttl > FL_MAX_LINGER && !capable(CAP_NET_ADMIN))
260                 return 0;
261         return ttl*HZ;
262 }
263
264 static int fl6_renew(struct ip6_flowlabel *fl, unsigned long linger, unsigned long expires)
265 {
266         linger = check_linger(linger);
267         if (!linger)
268                 return -EPERM;
269         expires = check_linger(expires);
270         if (!expires)
271                 return -EPERM;
272         fl->lastuse = jiffies;
273         if (time_before(fl->linger, linger))
274                 fl->linger = linger;
275         if (time_before(expires, fl->linger))
276                 expires = fl->linger;
277         if (time_before(fl->expires, fl->lastuse + expires))
278                 fl->expires = fl->lastuse + expires;
279         return 0;
280 }
281
282 static struct ip6_flowlabel *
283 fl_create(struct in6_flowlabel_req *freq, char __user *optval, int optlen, int *err_p)
284 {
285         struct ip6_flowlabel *fl;
286         int olen;
287         int addr_type;
288         int err;
289
290         err = -ENOMEM;
291         fl = kmalloc(sizeof(*fl), GFP_KERNEL);
292         if (fl == NULL)
293                 goto done;
294         memset(fl, 0, sizeof(*fl));
295
296         olen = optlen - CMSG_ALIGN(sizeof(*freq));
297         if (olen > 0) {
298                 struct msghdr msg;
299                 struct flowi flowi;
300                 int junk;
301
302                 err = -ENOMEM;
303                 fl->opt = kmalloc(sizeof(*fl->opt) + olen, GFP_KERNEL);
304                 if (fl->opt == NULL)
305                         goto done;
306
307                 memset(fl->opt, 0, sizeof(*fl->opt));
308                 fl->opt->tot_len = sizeof(*fl->opt) + olen;
309                 err = -EFAULT;
310                 if (copy_from_user(fl->opt+1, optval+CMSG_ALIGN(sizeof(*freq)), olen))
311                         goto done;
312
313                 msg.msg_controllen = olen;
314                 msg.msg_control = (void*)(fl->opt+1);
315                 flowi.oif = 0;
316
317                 err = datagram_send_ctl(&msg, &flowi, fl->opt, &junk, &junk);
318                 if (err)
319                         goto done;
320                 err = -EINVAL;
321                 if (fl->opt->opt_flen)
322                         goto done;
323                 if (fl->opt->opt_nflen == 0) {
324                         kfree(fl->opt);
325                         fl->opt = NULL;
326                 }
327         }
328
329         fl->expires = jiffies;
330         err = fl6_renew(fl, freq->flr_linger, freq->flr_expires);
331         if (err)
332                 goto done;
333         fl->share = freq->flr_share;
334         addr_type = ipv6_addr_type(&freq->flr_dst);
335         if ((addr_type&IPV6_ADDR_MAPPED)
336             || addr_type == IPV6_ADDR_ANY)
337                 goto done;
338         ipv6_addr_copy(&fl->dst, &freq->flr_dst);
339         atomic_set(&fl->users, 1);
340         switch (fl->share) {
341         case IPV6_FL_S_EXCL:
342         case IPV6_FL_S_ANY:
343                 break;
344         case IPV6_FL_S_PROCESS:
345                 fl->owner = current->pid;
346                 break;
347         case IPV6_FL_S_USER:
348                 fl->owner = current->euid;
349                 break;
350         default:
351                 err = -EINVAL;
352                 goto done;
353         }
354         return fl;
355
356 done:
357         fl_free(fl);
358         *err_p = err;
359         return NULL;
360 }
361
362 static int mem_check(struct sock *sk)
363 {
364         struct ipv6_pinfo *np = inet6_sk(sk);
365         struct ipv6_fl_socklist *sfl;
366         int room = FL_MAX_SIZE - atomic_read(&fl_size);
367         int count = 0;
368
369         if (room > FL_MAX_SIZE - FL_MAX_PER_SOCK)
370                 return 0;
371
372         for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next)
373                 count++;
374
375         if (room <= 0 ||
376             ((count >= FL_MAX_PER_SOCK ||
377              (count > 0 && room < FL_MAX_SIZE/2) || room < FL_MAX_SIZE/4)
378              && !capable(CAP_NET_ADMIN)))
379                 return -ENOBUFS;
380
381         return 0;
382 }
383
384 static int ipv6_hdr_cmp(struct ipv6_opt_hdr *h1, struct ipv6_opt_hdr *h2)
385 {
386         if (h1 == h2)
387                 return 0;
388         if (h1 == NULL || h2 == NULL)
389                 return 1;
390         if (h1->hdrlen != h2->hdrlen)
391                 return 1;
392         return memcmp(h1+1, h2+1, ((h1->hdrlen+1)<<3) - sizeof(*h1));
393 }
394
395 static int ipv6_opt_cmp(struct ipv6_txoptions *o1, struct ipv6_txoptions *o2)
396 {
397         if (o1 == o2)
398                 return 0;
399         if (o1 == NULL || o2 == NULL)
400                 return 1;
401         if (o1->opt_nflen != o2->opt_nflen)
402                 return 1;
403         if (ipv6_hdr_cmp(o1->hopopt, o2->hopopt))
404                 return 1;
405         if (ipv6_hdr_cmp(o1->dst0opt, o2->dst0opt))
406                 return 1;
407         if (ipv6_hdr_cmp((struct ipv6_opt_hdr *)o1->srcrt, (struct ipv6_opt_hdr *)o2->srcrt))
408                 return 1;
409         return 0;
410 }
411
412 int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen)
413 {
414         int err;
415         struct ipv6_pinfo *np = inet6_sk(sk);
416         struct in6_flowlabel_req freq;
417         struct ipv6_fl_socklist *sfl1=NULL;
418         struct ipv6_fl_socklist *sfl, **sflp;
419         struct ip6_flowlabel *fl;
420
421         if (optlen < sizeof(freq))
422                 return -EINVAL;
423
424         if (copy_from_user(&freq, optval, sizeof(freq)))
425                 return -EFAULT;
426
427         switch (freq.flr_action) {
428         case IPV6_FL_A_PUT:
429                 write_lock_bh(&ip6_sk_fl_lock);
430                 for (sflp = &np->ipv6_fl_list; (sfl=*sflp)!=NULL; sflp = &sfl->next) {
431                         if (sfl->fl->label == freq.flr_label) {
432                                 if (freq.flr_label == (np->flow_label&IPV6_FLOWLABEL_MASK))
433                                         np->flow_label &= ~IPV6_FLOWLABEL_MASK;
434                                 *sflp = sfl->next;
435                                 write_unlock_bh(&ip6_sk_fl_lock);
436                                 fl_release(sfl->fl);
437                                 kfree(sfl);
438                                 return 0;
439                         }
440                 }
441                 write_unlock_bh(&ip6_sk_fl_lock);
442                 return -ESRCH;
443
444         case IPV6_FL_A_RENEW:
445                 read_lock_bh(&ip6_sk_fl_lock);
446                 for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) {
447                         if (sfl->fl->label == freq.flr_label) {
448                                 err = fl6_renew(sfl->fl, freq.flr_linger, freq.flr_expires);
449                                 read_unlock_bh(&ip6_sk_fl_lock);
450                                 return err;
451                         }
452                 }
453                 read_unlock_bh(&ip6_sk_fl_lock);
454
455                 if (freq.flr_share == IPV6_FL_S_NONE && capable(CAP_NET_ADMIN)) {
456                         fl = fl_lookup(freq.flr_label);
457                         if (fl) {
458                                 err = fl6_renew(fl, freq.flr_linger, freq.flr_expires);
459                                 fl_release(fl);
460                                 return err;
461                         }
462                 }
463                 return -ESRCH;
464
465         case IPV6_FL_A_GET:
466                 if (freq.flr_label & ~IPV6_FLOWLABEL_MASK)
467                         return -EINVAL;
468
469                 fl = fl_create(&freq, optval, optlen, &err);
470                 if (fl == NULL)
471                         return err;
472                 sfl1 = kmalloc(sizeof(*sfl1), GFP_KERNEL);
473
474                 if (freq.flr_label) {
475                         struct ip6_flowlabel *fl1 = NULL;
476
477                         err = -EEXIST;
478                         read_lock_bh(&ip6_sk_fl_lock);
479                         for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) {
480                                 if (sfl->fl->label == freq.flr_label) {
481                                         if (freq.flr_flags&IPV6_FL_F_EXCL) {
482                                                 read_unlock_bh(&ip6_sk_fl_lock);
483                                                 goto done;
484                                         }
485                                         fl1 = sfl->fl;
486                                         atomic_inc(&fl->users);
487                                         break;
488                                 }
489                         }
490                         read_unlock_bh(&ip6_sk_fl_lock);
491
492                         if (fl1 == NULL)
493                                 fl1 = fl_lookup(freq.flr_label);
494                         if (fl1) {
495                                 err = -EEXIST;
496                                 if (freq.flr_flags&IPV6_FL_F_EXCL)
497                                         goto release;
498                                 err = -EPERM;
499                                 if (fl1->share == IPV6_FL_S_EXCL ||
500                                     fl1->share != fl->share ||
501                                     fl1->owner != fl->owner)
502                                         goto release;
503
504                                 err = -EINVAL;
505                                 if (!ipv6_addr_equal(&fl1->dst, &fl->dst) ||
506                                     ipv6_opt_cmp(fl1->opt, fl->opt))
507                                         goto release;
508
509                                 err = -ENOMEM;
510                                 if (sfl1 == NULL)
511                                         goto release;
512                                 if (fl->linger > fl1->linger)
513                                         fl1->linger = fl->linger;
514                                 if ((long)(fl->expires - fl1->expires) > 0)
515                                         fl1->expires = fl->expires;
516                                 write_lock_bh(&ip6_sk_fl_lock);
517                                 sfl1->fl = fl1;
518                                 sfl1->next = np->ipv6_fl_list;
519                                 np->ipv6_fl_list = sfl1;
520                                 write_unlock_bh(&ip6_sk_fl_lock);
521                                 fl_free(fl);
522                                 return 0;
523
524 release:
525                                 fl_release(fl1);
526                                 goto done;
527                         }
528                 }
529                 err = -ENOENT;
530                 if (!(freq.flr_flags&IPV6_FL_F_CREATE))
531                         goto done;
532
533                 err = -ENOMEM;
534                 if (sfl1 == NULL || (err = mem_check(sk)) != 0)
535                         goto done;
536
537                 err = fl_intern(fl, freq.flr_label);
538                 if (err)
539                         goto done;
540
541                 if (!freq.flr_label) {
542                         if (copy_to_user(&((struct in6_flowlabel_req __user *) optval)->flr_label,
543                                          &fl->label, sizeof(fl->label))) {
544                                 /* Intentionally ignore fault. */
545                         }
546                 }
547
548                 sfl1->fl = fl;
549                 sfl1->next = np->ipv6_fl_list;
550                 np->ipv6_fl_list = sfl1;
551                 return 0;
552
553         default:
554                 return -EINVAL;
555         }
556
557 done:
558         fl_free(fl);
559         kfree(sfl1);
560         return err;
561 }
562
563 #ifdef CONFIG_PROC_FS
564
565 struct ip6fl_iter_state {
566         int bucket;
567 };
568
569 #define ip6fl_seq_private(seq)  ((struct ip6fl_iter_state *)(seq)->private)
570
571 static struct ip6_flowlabel *ip6fl_get_first(struct seq_file *seq)
572 {
573         struct ip6_flowlabel *fl = NULL;
574         struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
575
576         for (state->bucket = 0; state->bucket <= FL_HASH_MASK; ++state->bucket) {
577                 if (fl_ht[state->bucket]) {
578                         fl = fl_ht[state->bucket];
579                         break;
580                 }
581         }
582         return fl;
583 }
584
585 static struct ip6_flowlabel *ip6fl_get_next(struct seq_file *seq, struct ip6_flowlabel *fl)
586 {
587         struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
588
589         fl = fl->next;
590         while (!fl) {
591                 if (++state->bucket <= FL_HASH_MASK)
592                         fl = fl_ht[state->bucket];
593         }
594         return fl;
595 }
596
597 static struct ip6_flowlabel *ip6fl_get_idx(struct seq_file *seq, loff_t pos)
598 {
599         struct ip6_flowlabel *fl = ip6fl_get_first(seq);
600         if (fl)
601                 while (pos && (fl = ip6fl_get_next(seq, fl)) != NULL)
602                         --pos;
603         return pos ? NULL : fl;
604 }
605
606 static void *ip6fl_seq_start(struct seq_file *seq, loff_t *pos)
607 {
608         read_lock_bh(&ip6_fl_lock);
609         return *pos ? ip6fl_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
610 }
611
612 static void *ip6fl_seq_next(struct seq_file *seq, void *v, loff_t *pos)
613 {
614         struct ip6_flowlabel *fl;
615
616         if (v == SEQ_START_TOKEN)
617                 fl = ip6fl_get_first(seq);
618         else
619                 fl = ip6fl_get_next(seq, v);
620         ++*pos;
621         return fl;
622 }
623
624 static void ip6fl_seq_stop(struct seq_file *seq, void *v)
625 {
626         read_unlock_bh(&ip6_fl_lock);
627 }
628
629 static void ip6fl_fl_seq_show(struct seq_file *seq, struct ip6_flowlabel *fl)
630 {
631         while(fl) {
632                 seq_printf(seq,
633                            "%05X %-1d %-6d %-6d %-6ld %-8ld "
634                            "%02x%02x%02x%02x%02x%02x%02x%02x "
635                            "%-4d\n",
636                            (unsigned)ntohl(fl->label),
637                            fl->share,
638                            (unsigned)fl->owner,
639                            atomic_read(&fl->users),
640                            fl->linger/HZ,
641                            (long)(fl->expires - jiffies)/HZ,
642                            NIP6(fl->dst),
643                            fl->opt ? fl->opt->opt_nflen : 0);
644                 fl = fl->next;
645         }
646 }
647
648 static int ip6fl_seq_show(struct seq_file *seq, void *v)
649 {
650         if (v == SEQ_START_TOKEN)
651                 seq_puts(seq, "Label S Owner  Users  Linger Expires  "
652                               "Dst                              Opt\n");
653         else
654                 ip6fl_fl_seq_show(seq, v);
655         return 0;
656 }
657
658 static struct seq_operations ip6fl_seq_ops = {
659         .start  =       ip6fl_seq_start,
660         .next   =       ip6fl_seq_next,
661         .stop   =       ip6fl_seq_stop,
662         .show   =       ip6fl_seq_show,
663 };
664
665 static int ip6fl_seq_open(struct inode *inode, struct file *file)
666 {
667         struct seq_file *seq;
668         int rc = -ENOMEM;
669         struct ip6fl_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
670
671         if (!s)
672                 goto out;
673
674         rc = seq_open(file, &ip6fl_seq_ops);
675         if (rc)
676                 goto out_kfree;
677
678         seq = file->private_data;
679         seq->private = s;
680         memset(s, 0, sizeof(*s));
681 out:
682         return rc;
683 out_kfree:
684         kfree(s);
685         goto out;
686 }
687
688 static struct file_operations ip6fl_seq_fops = {
689         .owner          =       THIS_MODULE,
690         .open           =       ip6fl_seq_open,
691         .read           =       seq_read,
692         .llseek         =       seq_lseek,
693         .release        =       seq_release_private,
694 };
695 #endif
696
697
698 void ip6_flowlabel_init(void)
699 {
700 #ifdef CONFIG_PROC_FS
701         proc_net_fops_create("ip6_flowlabel", S_IRUGO, &ip6fl_seq_fops);
702 #endif
703 }
704
705 void ip6_flowlabel_cleanup(void)
706 {
707         del_timer(&ip6_fl_gc_timer);
708 #ifdef CONFIG_PROC_FS
709         proc_net_remove("ip6_flowlabel");
710 #endif
711 }