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TOMOYO Linux Cross Reference
Linux/net/ipv6/ip6_flowlabel.c

Version: ~ [ linux-5.6 ] ~ [ linux-5.5.13 ] ~ [ linux-5.4.28 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.113 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.174 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.217 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.217 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.82 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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  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 
 23 #include <net/sock.h>
 24 
 25 #include <net/ipv6.h>
 26 #include <net/ndisc.h>
 27 #include <net/protocol.h>
 28 #include <net/ip6_route.h>
 29 #include <net/addrconf.h>
 30 #include <net/rawv6.h>
 31 #include <net/icmp.h>
 32 #include <net/transp_v6.h>
 33 
 34 #include <asm/uaccess.h>
 35 
 36 #define FL_MIN_LINGER   6       /* Minimal linger. It is set to 6sec specified
 37                                    in old IPv6 RFC. Well, it was reasonable value.
 38                                  */
 39 #define FL_MAX_LINGER   60      /* Maximal linger timeout */
 40 
 41 /* FL hash table */
 42 
 43 #define FL_MAX_PER_SOCK 32
 44 #define FL_MAX_SIZE     4096
 45 #define FL_HASH_MASK    255
 46 #define FL_HASH(l)      (ntohl(l)&FL_HASH_MASK)
 47 
 48 static atomic_t fl_size = ATOMIC_INIT(0);
 49 static struct ip6_flowlabel *fl_ht[FL_HASH_MASK+1];
 50 
 51 static struct timer_list ip6_fl_gc_timer;
 52 
 53 /* FL hash table lock: it protects only of GC */
 54 
 55 static rwlock_t ip6_fl_lock = RW_LOCK_UNLOCKED;
 56 
 57 /* Big socket sock */
 58 
 59 static rwlock_t ip6_sk_fl_lock = RW_LOCK_UNLOCKED;
 60 
 61 
 62 static __inline__ struct ip6_flowlabel * __fl_lookup(u32 label)
 63 {
 64         struct ip6_flowlabel *fl;
 65 
 66         for (fl=fl_ht[FL_HASH(label)]; fl; fl = fl->next) {
 67                 if (fl->label == label)
 68                         return fl;
 69         }
 70         return NULL;
 71 }
 72 
 73 static struct ip6_flowlabel * fl_lookup(u32 label)
 74 {
 75         struct ip6_flowlabel *fl;
 76 
 77         read_lock_bh(&ip6_fl_lock);
 78         fl = __fl_lookup(label);
 79         if (fl)
 80                 atomic_inc(&fl->users);
 81         read_unlock_bh(&ip6_fl_lock);
 82         return fl;
 83 }
 84 
 85 
 86 static void fl_free(struct ip6_flowlabel *fl)
 87 {
 88         if (fl->opt)
 89                 kfree(fl->opt);
 90         kfree(fl);
 91 }
 92 
 93 static void fl_release(struct ip6_flowlabel *fl)
 94 {
 95         fl->lastuse = jiffies;
 96         if (atomic_dec_and_test(&fl->users)) {
 97                 unsigned long ttd = fl->lastuse + fl->linger;
 98                 if ((long)(ttd - fl->expires) > 0)
 99                         fl->expires = ttd;
100                 ttd = fl->expires;
101                 if (fl->opt && fl->share == IPV6_FL_S_EXCL) {
102                         struct ipv6_txoptions *opt = fl->opt;
103                         fl->opt = NULL;
104                         kfree(opt);
105                 }
106                 if (!del_timer(&ip6_fl_gc_timer) ||
107                     (long)(ip6_fl_gc_timer.expires - ttd) > 0)
108                         ip6_fl_gc_timer.expires = ttd;
109                 add_timer(&ip6_fl_gc_timer);
110         }
111 }
112 
113 static void ip6_fl_gc(unsigned long dummy)
114 {
115         int i;
116         unsigned long now = jiffies;
117         unsigned long sched = 0;
118 
119         write_lock(&ip6_fl_lock);
120 
121         for (i=0; i<=FL_HASH_MASK; i++) {
122                 struct ip6_flowlabel *fl, **flp;
123                 flp = &fl_ht[i];
124                 while ((fl=*flp) != NULL) {
125                         if (atomic_read(&fl->users) == 0) {
126                                 unsigned long ttd = fl->lastuse + fl->linger;
127                                 if ((long)(ttd - fl->expires) > 0)
128                                         fl->expires = ttd;
129                                 ttd = fl->expires;
130                                 if ((long)(now - ttd) >= 0) {
131                                         *flp = fl->next;
132                                         fl_free(fl);
133                                         atomic_dec(&fl_size);
134                                         continue;
135                                 }
136                                 if (!sched || (long)(ttd - sched) < 0)
137                                         sched = ttd;
138                         }
139                         flp = &fl->next;
140                 }
141         }
142         if (!sched && atomic_read(&fl_size))
143                 sched = now + FL_MAX_LINGER;
144         if (sched) {
145                 ip6_fl_gc_timer.expires = sched;
146                 add_timer(&ip6_fl_gc_timer);
147         }
148         write_unlock(&ip6_fl_lock);
149 }
150 
151 static int fl_intern(struct ip6_flowlabel *fl, __u32 label)
152 {
153         fl->label = label & IPV6_FLOWLABEL_MASK;
154 
155         write_lock_bh(&ip6_fl_lock);
156         if (label == 0) {
157                 for (;;) {
158                         fl->label = htonl(net_random())&IPV6_FLOWLABEL_MASK;
159                         if (fl->label) {
160                                 struct ip6_flowlabel *lfl;
161                                 lfl = __fl_lookup(fl->label);
162                                 if (lfl == NULL)
163                                         break;
164                         }
165                 }
166         }
167 
168         fl->lastuse = jiffies;
169         fl->next = fl_ht[FL_HASH(fl->label)];
170         fl_ht[FL_HASH(fl->label)] = fl;
171         atomic_inc(&fl_size);
172         write_unlock_bh(&ip6_fl_lock);
173         return 0;
174 }
175 
176 
177 
178 /* Socket flowlabel lists */
179 
180 struct ip6_flowlabel * fl6_sock_lookup(struct sock *sk, u32 label)
181 {
182         struct ipv6_fl_socklist *sfl;
183         struct ipv6_pinfo *np = &sk->net_pinfo.af_inet6;
184 
185         label &= IPV6_FLOWLABEL_MASK;
186 
187         for (sfl=np->ipv6_fl_list; sfl; sfl = sfl->next) {
188                 struct ip6_flowlabel *fl = sfl->fl;
189                 if (fl->label == label) {
190                         fl->lastuse = jiffies;
191                         atomic_inc(&fl->users);
192                         return fl;
193                 }
194         }
195         return NULL;
196 }
197 
198 void fl6_free_socklist(struct sock *sk)
199 {
200         struct ipv6_pinfo *np = &sk->net_pinfo.af_inet6;
201         struct ipv6_fl_socklist *sfl;
202 
203         while ((sfl = np->ipv6_fl_list) != NULL) {
204                 np->ipv6_fl_list = sfl->next;
205                 fl_release(sfl->fl);
206                 kfree(sfl);
207         }
208 }
209 
210 /* Service routines */
211 
212 
213 /*
214    It is the only difficult place. flowlabel enforces equal headers
215    before and including routing header, however user may supply options
216    following rthdr.
217  */
218 
219 struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
220                                          struct ip6_flowlabel * fl,
221                                          struct ipv6_txoptions * fopt)
222 {
223         struct ipv6_txoptions * fl_opt = fl->opt;
224 
225         if (fopt == NULL || fopt->opt_flen == 0)
226                 return fl_opt;
227 
228         if (fl_opt != NULL) {
229                 opt_space->hopopt = fl_opt->hopopt;
230                 opt_space->dst0opt = fl_opt->dst0opt;
231                 opt_space->srcrt = fl_opt->srcrt;
232                 opt_space->opt_nflen = fl_opt->opt_nflen;
233         } else {
234                 if (fopt->opt_nflen == 0)
235                         return fopt;
236                 opt_space->hopopt = NULL;
237                 opt_space->dst0opt = NULL;
238                 opt_space->srcrt = NULL;
239                 opt_space->opt_nflen = 0;
240         }
241         opt_space->dst1opt = fopt->dst1opt;
242         opt_space->auth = fopt->auth;
243         opt_space->opt_flen = fopt->opt_flen;
244         return opt_space;
245 }
246 
247 static __u32 check_linger(__u16 ttl)
248 {
249         if (ttl < FL_MIN_LINGER)
250                 return FL_MIN_LINGER*HZ;
251         if (ttl > FL_MAX_LINGER && !capable(CAP_NET_ADMIN))
252                 return 0;
253         return ttl*HZ;
254 }
255 
256 static int fl6_renew(struct ip6_flowlabel *fl, unsigned linger, unsigned expires)
257 {
258         linger = check_linger(linger);
259         if (!linger)
260                 return -EPERM;
261         expires = check_linger(expires);
262         if (!expires)
263                 return -EPERM;
264         fl->lastuse = jiffies;
265         if (fl->linger < linger)
266                 fl->linger = linger;
267         if (expires < fl->linger)
268                 expires = fl->linger;
269         if ((long)(fl->expires - (fl->lastuse+expires)) < 0)
270                 fl->expires = fl->lastuse + expires;
271         return 0;
272 }
273 
274 static struct ip6_flowlabel *
275 fl_create(struct in6_flowlabel_req *freq, char *optval, int optlen, int *err_p)
276 {
277         struct ip6_flowlabel *fl = NULL;
278         int olen;
279         int addr_type;
280         int err;
281 
282         olen = optlen - CMSG_ALIGN(sizeof(*freq));
283         err = -EINVAL;
284         if (olen > 64 * 1024)
285                 goto done;
286 
287         err = -ENOMEM;
288         fl = kmalloc(sizeof(*fl), GFP_KERNEL);
289         if (fl == NULL)
290                 goto done;
291         memset(fl, 0, sizeof(*fl));
292 
293         if (olen > 0) {
294                 struct msghdr msg;
295                 struct flowi flowi;
296                 int junk;
297 
298                 err = -ENOMEM;
299                 fl->opt = kmalloc(sizeof(*fl->opt) + olen, GFP_KERNEL);
300                 if (fl->opt == NULL)
301                         goto done;
302 
303                 memset(fl->opt, 0, sizeof(*fl->opt));
304                 fl->opt->tot_len = sizeof(*fl->opt) + olen;
305                 err = -EFAULT;
306                 if (copy_from_user(fl->opt+1, optval+CMSG_ALIGN(sizeof(*freq)), olen))
307                         goto done;
308 
309                 msg.msg_controllen = olen;
310                 msg.msg_control = (void*)(fl->opt+1);
311                 flowi.oif = 0;
312 
313                 err = datagram_send_ctl(&msg, &flowi, fl->opt, &junk);
314                 if (err)
315                         goto done;
316                 err = -EINVAL;
317                 if (fl->opt->opt_flen)
318                         goto done;
319                 if (fl->opt->opt_nflen == 0) {
320                         kfree(fl->opt);
321                         fl->opt = NULL;
322                 }
323         }
324 
325         fl->expires = jiffies;
326         err = fl6_renew(fl, freq->flr_linger, freq->flr_expires);
327         if (err)
328                 goto done;
329         fl->share = freq->flr_share;
330         addr_type = ipv6_addr_type(&freq->flr_dst);
331         if ((addr_type&IPV6_ADDR_MAPPED)
332             || addr_type == IPV6_ADDR_ANY)
333                 goto done;
334         ipv6_addr_copy(&fl->dst, &freq->flr_dst);
335         atomic_set(&fl->users, 1);
336         switch (fl->share) {
337         case IPV6_FL_S_EXCL:
338         case IPV6_FL_S_ANY:
339                 break;
340         case IPV6_FL_S_PROCESS:
341                 fl->owner = current->pid;
342                 break;
343         case IPV6_FL_S_USER:
344                 fl->owner = current->euid;
345                 break;
346         default:
347                 err = -EINVAL;
348                 goto done;
349         }
350         return fl;
351 
352 done:
353         if (fl)
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_fl_socklist *sfl;
362         int room = FL_MAX_SIZE - atomic_read(&fl_size);
363         int count = 0;
364 
365         if (room > FL_MAX_SIZE - FL_MAX_PER_SOCK)
366                 return 0;
367 
368         for (sfl = sk->net_pinfo.af_inet6.ipv6_fl_list; sfl; sfl = sfl->next)
369                 count++;
370 
371         if (room <= 0 ||
372             ((count >= FL_MAX_PER_SOCK ||
373              (count > 0 && room < FL_MAX_SIZE/2) || room < FL_MAX_SIZE/4)
374              && !capable(CAP_NET_ADMIN)))
375                 return -ENOBUFS;
376 
377         return 0;
378 }
379 
380 static int ipv6_hdr_cmp(struct ipv6_opt_hdr *h1, struct ipv6_opt_hdr *h2)
381 {
382         if (h1 == h2)
383                 return 0;
384         if (h1 == NULL || h2 == NULL)
385                 return 1;
386         if (h1->hdrlen != h2->hdrlen)
387                 return 1;
388         return memcmp(h1+1, h2+1, ((h1->hdrlen+1)<<3) - sizeof(*h1));
389 }
390 
391 static int ipv6_opt_cmp(struct ipv6_txoptions *o1, struct ipv6_txoptions *o2)
392 {
393         if (o1 == o2)
394                 return 0;
395         if (o1 == NULL || o2 == NULL)
396                 return 1;
397         if (o1->opt_nflen != o2->opt_nflen)
398                 return 1;
399         if (ipv6_hdr_cmp(o1->hopopt, o2->hopopt))
400                 return 1;
401         if (ipv6_hdr_cmp(o1->dst0opt, o2->dst0opt))
402                 return 1;
403         if (ipv6_hdr_cmp((struct ipv6_opt_hdr *)o1->srcrt, (struct ipv6_opt_hdr *)o2->srcrt))
404                 return 1;
405         return 0;
406 }
407 
408 int ipv6_flowlabel_opt(struct sock *sk, char *optval, int optlen)
409 {
410         int err;
411         struct ipv6_pinfo *np = &sk->net_pinfo.af_inet6;
412         struct in6_flowlabel_req freq;
413         struct ipv6_fl_socklist *sfl1=NULL;
414         struct ipv6_fl_socklist *sfl, **sflp;
415         struct ip6_flowlabel *fl;
416 
417         if (optlen < sizeof(freq))
418                 return -EINVAL;
419 
420         if (copy_from_user(&freq, optval, sizeof(freq)))
421                 return -EFAULT;
422 
423         switch (freq.flr_action) {
424         case IPV6_FL_A_PUT:
425                 write_lock_bh(&ip6_sk_fl_lock);
426                 for (sflp = &np->ipv6_fl_list; (sfl=*sflp)!=NULL; sflp = &sfl->next) {
427                         if (sfl->fl->label == freq.flr_label) {
428                                 if (freq.flr_label == (np->flow_label&IPV6_FLOWLABEL_MASK))
429                                         np->flow_label &= ~IPV6_FLOWLABEL_MASK;
430                                 *sflp = sfl->next;
431                                 write_unlock_bh(&ip6_sk_fl_lock);
432                                 fl_release(sfl->fl);
433                                 kfree(sfl);
434                                 return 0;
435                         }
436                 }
437                 write_unlock_bh(&ip6_sk_fl_lock);
438                 return -ESRCH;
439 
440         case IPV6_FL_A_RENEW:
441                 read_lock_bh(&ip6_sk_fl_lock);
442                 for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) {
443                         if (sfl->fl->label == freq.flr_label) {
444                                 err = fl6_renew(sfl->fl, freq.flr_linger, freq.flr_expires);
445                                 read_unlock_bh(&ip6_sk_fl_lock);
446                                 return err;
447                         }
448                 }
449                 read_unlock_bh(&ip6_sk_fl_lock);
450 
451                 if (freq.flr_share == IPV6_FL_S_NONE && capable(CAP_NET_ADMIN)) {
452                         fl = fl_lookup(freq.flr_label);
453                         if (fl) {
454                                 err = fl6_renew(fl, freq.flr_linger, freq.flr_expires);
455                                 fl_release(fl);
456                                 return err;
457                         }
458                 }
459                 return -ESRCH;
460 
461         case IPV6_FL_A_GET:
462                 if (freq.flr_label & ~IPV6_FLOWLABEL_MASK)
463                         return -EINVAL;
464 
465                 fl = fl_create(&freq, optval, optlen, &err);
466                 if (fl == NULL)
467                         return err;
468                 sfl1 = kmalloc(sizeof(*sfl1), GFP_KERNEL);
469 
470                 if (freq.flr_label) {
471                         struct ip6_flowlabel *fl1 = NULL;
472 
473                         err = -EEXIST;
474                         read_lock_bh(&ip6_sk_fl_lock);
475                         for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) {
476                                 if (sfl->fl->label == freq.flr_label) {
477                                         if (freq.flr_flags&IPV6_FL_F_EXCL) {
478                                                 read_unlock_bh(&ip6_sk_fl_lock);
479                                                 goto done;
480                                         }
481                                         fl1 = sfl->fl;
482                                         atomic_inc(&fl1->users);
483                                         break;
484                                 }
485                         }
486                         read_unlock_bh(&ip6_sk_fl_lock);
487 
488                         if (fl1 == NULL)
489                                 fl1 = fl_lookup(freq.flr_label);
490                         if (fl1) {
491                                 err = -EEXIST;
492                                 if (freq.flr_flags&IPV6_FL_F_EXCL)
493                                         goto release;
494                                 err = -EPERM;
495                                 if (fl1->share == IPV6_FL_S_EXCL ||
496                                     fl1->share != fl->share ||
497                                     fl1->owner != fl->owner)
498                                         goto release;
499 
500                                 err = -EINVAL;
501                                 if (ipv6_addr_cmp(&fl1->dst, &fl->dst) ||
502                                     ipv6_opt_cmp(fl1->opt, fl->opt))
503                                         goto release;
504 
505                                 err = -ENOMEM;
506                                 if (sfl1 == NULL)
507                                         goto release;
508                                 if (fl->linger > fl1->linger)
509                                         fl1->linger = fl->linger;
510                                 if ((long)(fl->expires - fl1->expires) > 0)
511                                         fl1->expires = fl->expires;
512                                 write_lock_bh(&ip6_sk_fl_lock);
513                                 sfl1->fl = fl1;
514                                 sfl1->next = np->ipv6_fl_list;
515                                 np->ipv6_fl_list = sfl1;
516                                 write_unlock_bh(&ip6_sk_fl_lock);
517                                 fl_free(fl);
518                                 return 0;
519 
520 release:
521                                 fl_release(fl1);
522                                 goto done;
523                         }
524                 }
525                 err = -ENOENT;
526                 if (!(freq.flr_flags&IPV6_FL_F_CREATE))
527                         goto done;
528 
529                 err = -ENOMEM;
530                 if (sfl1 == NULL || (err = mem_check(sk)) != 0)
531                         goto done;
532 
533                 err = fl_intern(fl, freq.flr_label);
534                 if (err)
535                         goto done;
536 
537                 /* Do not check for fault */
538                 if (!freq.flr_label)
539                         copy_to_user(optval + ((u8*)&freq.flr_label - (u8*)&freq), &fl->label, sizeof(fl->label));
540 
541                 sfl1->fl = fl;
542                 sfl1->next = np->ipv6_fl_list;
543                 np->ipv6_fl_list = sfl1;
544                 return 0;
545 
546         default:
547                 return -EINVAL;
548         }
549 
550 done:
551         if (fl)
552                 fl_free(fl);
553         if (sfl1)
554                 kfree(sfl1);
555         return err;
556 }
557 
558 #ifdef CONFIG_PROC_FS
559 
560 
561 static int ip6_fl_read_proc(char *buffer, char **start, off_t offset,
562                             int length, int *eof, void *data)
563 {
564         off_t pos=0;
565         off_t begin=0;
566         int len=0;
567         int i, k;
568         struct ip6_flowlabel *fl;
569 
570         len+= sprintf(buffer,"Label S Owner  Users  Linger Expires  "
571                       "Dst                              Opt\n");
572 
573         read_lock_bh(&ip6_fl_lock);
574         for (i=0; i<=FL_HASH_MASK; i++) {
575                 for (fl = fl_ht[i]; fl; fl = fl->next) {
576                         len+=sprintf(buffer+len,"%05X %-1d %-6d %-6d %-6d %-8ld ",
577                                      (unsigned)ntohl(fl->label),
578                                      fl->share,
579                                      (unsigned)fl->owner,
580                                      atomic_read(&fl->users),
581                                      fl->linger/HZ,
582                                      (long)(fl->expires - jiffies)/HZ);
583 
584                         for (k=0; k<16; k++)
585                                 len+=sprintf(buffer+len, "%02x", fl->dst.s6_addr[k]);
586                         buffer[len++]=' ';
587                         len+=sprintf(buffer+len, "%-4d", fl->opt ? fl->opt->opt_nflen : 0);
588                         buffer[len++]='\n';
589 
590                         pos=begin+len;
591                         if(pos<offset) {
592                                 len=0;
593                                 begin=pos;
594                         }
595                         if(pos>offset+length)
596                                 goto done;
597                 }
598         }
599         *eof = 1;
600 
601 done:
602         read_unlock_bh(&ip6_fl_lock);
603         *start=buffer+(offset-begin);
604         len-=(offset-begin);
605         if(len>length)
606                 len=length;
607         if(len<0)
608                 len=0;
609         return len;
610 }
611 #endif
612 
613 
614 void ip6_flowlabel_init()
615 {
616         init_timer(&ip6_fl_gc_timer);
617         ip6_fl_gc_timer.function = ip6_fl_gc;
618 #ifdef CONFIG_PROC_FS
619         create_proc_read_entry("net/ip6_flowlabel", 0, 0, ip6_fl_read_proc, NULL);
620 #endif
621 }
622 
623 void ip6_flowlabel_cleanup()
624 {
625         del_timer(&ip6_fl_gc_timer);
626 #ifdef CONFIG_PROC_FS
627         remove_proc_entry("net/ip6_flowlabel", 0);
628 #endif
629 }
630 

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