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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/capability.h>
  13 #include <linux/errno.h>
  14 #include <linux/types.h>
  15 #include <linux/socket.h>
  16 #include <linux/net.h>
  17 #include <linux/netdevice.h>
  18 #include <linux/if_arp.h>
  19 #include <linux/in6.h>
  20 #include <linux/route.h>
  21 #include <linux/proc_fs.h>
  22 #include <linux/seq_file.h>
  23
  24 #include <net/net_namespace.h>
  25 #include <net/sock.h>
  26
  27 #include <net/ipv6.h>
  28 #include <net/ndisc.h>
  29 #include <net/protocol.h>
  30 #include <net/ip6_route.h>
  31 #include <net/addrconf.h>
  32 #include <net/rawv6.h>
  33 #include <net/icmp.h>
  34 #include <net/transp_v6.h>
  35
  36 #include <asm/uaccess.h>
  37
  38 #define FL_MIN_LINGER   6       /* Minimal linger. It is set to 6sec specified
  39                                    in old IPv6 RFC. Well, it was reasonable value.
  40                                  */
  41 #define FL_MAX_LINGER   60      /* Maximal linger timeout */
  42
  43 /* FL hash table */
  44
  45 #define FL_MAX_PER_SOCK 32
  46 #define FL_MAX_SIZE     4096
  47 #define FL_HASH_MASK    255
  48 #define FL_HASH(l)      (ntohl(l)&FL_HASH_MASK)
  49
  50 static atomic_t fl_size = ATOMIC_INIT(0);
  51 static struct ip6_flowlabel *fl_ht[FL_HASH_MASK+1];
  52
  53 static void ip6_fl_gc(unsigned long dummy);
  54 static DEFINE_TIMER(ip6_fl_gc_timer, ip6_fl_gc, 0, 0);
  55
  56 /* FL hash table lock: it protects only of GC */
  57
  58 static DEFINE_RWLOCK(ip6_fl_lock);
  59
  60 /* Big socket sock */
  61
  62 static DEFINE_RWLOCK(ip6_sk_fl_lock);
  63
  64
  65 static __inline__ struct ip6_flowlabel * __fl_lookup(__be32 label)
  66 {
  67         struct ip6_flowlabel *fl;
  68
  69         for (fl=fl_ht[FL_HASH(label)]; fl; fl = fl->next) {
  70                 if (fl->label == label)
  71                         return fl;
  72         }
  73         return NULL;
  74 }
  75
  76 static struct ip6_flowlabel * fl_lookup(__be32 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, __be32 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, __be32 label)
 187 {
 188         struct ipv6_fl_socklist *sfl;
 189         struct ipv6_pinfo *np = inet6_sk(sk);
 190
 191         label &= IPV6_FLOWLABEL_MASK;
 192
 193         read_lock_bh(&ip6_sk_fl_lock);
 194         for (sfl=np->ipv6_fl_list; sfl; sfl = sfl->next) {
 195                 struct ip6_flowlabel *fl = sfl->fl;
 196                 if (fl->label == label) {
 197                         read_unlock_bh(&ip6_sk_fl_lock);
 198                         fl->lastuse = jiffies;
 199                         atomic_inc(&fl->users);
 200                         return fl;
 201                 }
 202         }
 203         read_unlock_bh(&ip6_sk_fl_lock);
 204         return NULL;
 205 }
 206
 207 EXPORT_SYMBOL_GPL(fl6_sock_lookup);
 208
 209 void fl6_free_socklist(struct sock *sk)
 210 {
 211         struct ipv6_pinfo *np = inet6_sk(sk);
 212         struct ipv6_fl_socklist *sfl;
 213
 214         while ((sfl = np->ipv6_fl_list) != NULL) {
 215                 np->ipv6_fl_list = sfl->next;
 216                 fl_release(sfl->fl);
 217                 kfree(sfl);
 218         }
 219 }
 220
 221 /* Service routines */
 222
 223
 224 /*
 225    It is the only difficult place. flowlabel enforces equal headers
 226    before and including routing header, however user may supply options
 227    following rthdr.
 228  */
 229
 230 struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
 231                                          struct ip6_flowlabel * fl,
 232                                          struct ipv6_txoptions * fopt)
 233 {
 234         struct ipv6_txoptions * fl_opt = fl->opt;
 235
 236         if (fopt == NULL || fopt->opt_flen == 0)
 237                 return fl_opt;
 238
 239         if (fl_opt != NULL) {
 240                 opt_space->hopopt = fl_opt->hopopt;
 241                 opt_space->dst0opt = fl_opt->dst0opt;
 242                 opt_space->srcrt = fl_opt->srcrt;
 243                 opt_space->opt_nflen = fl_opt->opt_nflen;
 244         } else {
 245                 if (fopt->opt_nflen == 0)
 246                         return fopt;
 247                 opt_space->hopopt = NULL;
 248                 opt_space->dst0opt = NULL;
 249                 opt_space->srcrt = NULL;
 250                 opt_space->opt_nflen = 0;
 251         }
 252         opt_space->dst1opt = fopt->dst1opt;
 253         opt_space->opt_flen = fopt->opt_flen;
 254         return opt_space;
 255 }
 256
 257 static unsigned long check_linger(unsigned long ttl)
 258 {
 259         if (ttl < FL_MIN_LINGER)
 260                 return FL_MIN_LINGER*HZ;
 261         if (ttl > FL_MAX_LINGER && !capable(CAP_NET_ADMIN))
 262                 return 0;
 263         return ttl*HZ;
 264 }
 265
 266 static int fl6_renew(struct ip6_flowlabel *fl, unsigned long linger, unsigned long expires)
 267 {
 268         linger = check_linger(linger);
 269         if (!linger)
 270                 return -EPERM;
 271         expires = check_linger(expires);
 272         if (!expires)
 273                 return -EPERM;
 274         fl->lastuse = jiffies;
 275         if (time_before(fl->linger, linger))
 276                 fl->linger = linger;
 277         if (time_before(expires, fl->linger))
 278                 expires = fl->linger;
 279         if (time_before(fl->expires, fl->lastuse + expires))
 280                 fl->expires = fl->lastuse + expires;
 281         return 0;
 282 }
 283
 284 static struct ip6_flowlabel *
 285 fl_create(struct in6_flowlabel_req *freq, char __user *optval, int optlen, int *err_p)
 286 {
 287         struct ip6_flowlabel *fl;
 288         int olen;
 289         int addr_type;
 290         int err;
 291
 292         err = -ENOMEM;
 293         fl = kzalloc(sizeof(*fl), GFP_KERNEL);
 294         if (fl == NULL)
 295                 goto done;
 296
 297         olen = optlen - CMSG_ALIGN(sizeof(*freq));
 298         if (olen > 0) {
 299                 struct msghdr msg;
 300                 struct flowi flowi;
 301                 int junk;
 302
 303                 err = -ENOMEM;
 304                 fl->opt = kmalloc(sizeof(*fl->opt) + olen, GFP_KERNEL);
 305                 if (fl->opt == NULL)
 306                         goto done;
 307
 308                 memset(fl->opt, 0, sizeof(*fl->opt));
 309                 fl->opt->tot_len = sizeof(*fl->opt) + olen;
 310                 err = -EFAULT;
 311                 if (copy_from_user(fl->opt+1, optval+CMSG_ALIGN(sizeof(*freq)), olen))
 312                         goto done;
 313
 314                 msg.msg_controllen = olen;
 315                 msg.msg_control = (void*)(fl->opt+1);
 316                 flowi.oif = 0;
 317
 318                 err = datagram_send_ctl(&msg, &flowi, fl->opt, &junk, &junk);
 319                 if (err)
 320                         goto done;
 321                 err = -EINVAL;
 322                 if (fl->opt->opt_flen)
 323                         goto done;
 324                 if (fl->opt->opt_nflen == 0) {
 325                         kfree(fl->opt);
 326                         fl->opt = NULL;
 327                 }
 328         }
 329
 330         fl->expires = jiffies;
 331         err = fl6_renew(fl, freq->flr_linger, freq->flr_expires);
 332         if (err)
 333                 goto done;
 334         fl->share = freq->flr_share;
 335         addr_type = ipv6_addr_type(&freq->flr_dst);
 336         if ((addr_type&IPV6_ADDR_MAPPED)
 337             || addr_type == IPV6_ADDR_ANY) {
 338                 err = -EINVAL;
 339                 goto done;
 340         }
 341         ipv6_addr_copy(&fl->dst, &freq->flr_dst);
 342         atomic_set(&fl->users, 1);
 343         switch (fl->share) {
 344         case IPV6_FL_S_EXCL:
 345         case IPV6_FL_S_ANY:
 346                 break;
 347         case IPV6_FL_S_PROCESS:
 348                 fl->owner = current->pid;
 349                 break;
 350         case IPV6_FL_S_USER:
 351                 fl->owner = current->euid;
 352                 break;
 353         default:
 354                 err = -EINVAL;
 355                 goto done;
 356         }
 357         return fl;
 358
 359 done:
 360         fl_free(fl);
 361         *err_p = err;
 362         return NULL;
 363 }
 364
 365 static int mem_check(struct sock *sk)
 366 {
 367         struct ipv6_pinfo *np = inet6_sk(sk);
 368         struct ipv6_fl_socklist *sfl;
 369         int room = FL_MAX_SIZE - atomic_read(&fl_size);
 370         int count = 0;
 371
 372         if (room > FL_MAX_SIZE - FL_MAX_PER_SOCK)
 373                 return 0;
 374
 375         for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next)
 376                 count++;
 377
 378         if (room <= 0 ||
 379             ((count >= FL_MAX_PER_SOCK ||
 380              (count > 0 && room < FL_MAX_SIZE/2) || room < FL_MAX_SIZE/4)
 381              && !capable(CAP_NET_ADMIN)))
 382                 return -ENOBUFS;
 383
 384         return 0;
 385 }
 386
 387 static int ipv6_hdr_cmp(struct ipv6_opt_hdr *h1, struct ipv6_opt_hdr *h2)
 388 {
 389         if (h1 == h2)
 390                 return 0;
 391         if (h1 == NULL || h2 == NULL)
 392                 return 1;
 393         if (h1->hdrlen != h2->hdrlen)
 394                 return 1;
 395         return memcmp(h1+1, h2+1, ((h1->hdrlen+1)<<3) - sizeof(*h1));
 396 }
 397
 398 static int ipv6_opt_cmp(struct ipv6_txoptions *o1, struct ipv6_txoptions *o2)
 399 {
 400         if (o1 == o2)
 401                 return 0;
 402         if (o1 == NULL || o2 == NULL)
 403                 return 1;
 404         if (o1->opt_nflen != o2->opt_nflen)
 405                 return 1;
 406         if (ipv6_hdr_cmp(o1->hopopt, o2->hopopt))
 407                 return 1;
 408         if (ipv6_hdr_cmp(o1->dst0opt, o2->dst0opt))
 409                 return 1;
 410         if (ipv6_hdr_cmp((struct ipv6_opt_hdr *)o1->srcrt, (struct ipv6_opt_hdr *)o2->srcrt))
 411                 return 1;
 412         return 0;
 413 }
 414
 415 static inline void fl_link(struct ipv6_pinfo *np, struct ipv6_fl_socklist *sfl,
 416                 struct ip6_flowlabel *fl)
 417 {
 418         write_lock_bh(&ip6_sk_fl_lock);
 419         sfl->fl = fl;
 420         sfl->next = np->ipv6_fl_list;
 421         np->ipv6_fl_list = sfl;
 422         write_unlock_bh(&ip6_sk_fl_lock);
 423 }
 424
 425 int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen)
 426 {
 427         int err;
 428         struct ipv6_pinfo *np = inet6_sk(sk);
 429         struct in6_flowlabel_req freq;
 430         struct ipv6_fl_socklist *sfl1=NULL;
 431         struct ipv6_fl_socklist *sfl, **sflp;
 432         struct ip6_flowlabel *fl;
 433
 434         if (optlen < sizeof(freq))
 435                 return -EINVAL;
 436
 437         if (copy_from_user(&freq, optval, sizeof(freq)))
 438                 return -EFAULT;
 439
 440         switch (freq.flr_action) {
 441         case IPV6_FL_A_PUT:
 442                 write_lock_bh(&ip6_sk_fl_lock);
 443                 for (sflp = &np->ipv6_fl_list; (sfl=*sflp)!=NULL; sflp = &sfl->next) {
 444                         if (sfl->fl->label == freq.flr_label) {
 445                                 if (freq.flr_label == (np->flow_label&IPV6_FLOWLABEL_MASK))
 446                                         np->flow_label &= ~IPV6_FLOWLABEL_MASK;
 447                                 *sflp = sfl->next;
 448                                 write_unlock_bh(&ip6_sk_fl_lock);
 449                                 fl_release(sfl->fl);
 450                                 kfree(sfl);
 451                                 return 0;
 452                         }
 453                 }
 454                 write_unlock_bh(&ip6_sk_fl_lock);
 455                 return -ESRCH;
 456
 457         case IPV6_FL_A_RENEW:
 458                 read_lock_bh(&ip6_sk_fl_lock);
 459                 for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) {
 460                         if (sfl->fl->label == freq.flr_label) {
 461                                 err = fl6_renew(sfl->fl, freq.flr_linger, freq.flr_expires);
 462                                 read_unlock_bh(&ip6_sk_fl_lock);
 463                                 return err;
 464                         }
 465                 }
 466                 read_unlock_bh(&ip6_sk_fl_lock);
 467
 468                 if (freq.flr_share == IPV6_FL_S_NONE && capable(CAP_NET_ADMIN)) {
 469                         fl = fl_lookup(freq.flr_label);
 470                         if (fl) {
 471                                 err = fl6_renew(fl, freq.flr_linger, freq.flr_expires);
 472                                 fl_release(fl);
 473                                 return err;
 474                         }
 475                 }
 476                 return -ESRCH;
 477
 478         case IPV6_FL_A_GET:
 479                 if (freq.flr_label & ~IPV6_FLOWLABEL_MASK)
 480                         return -EINVAL;
 481
 482                 fl = fl_create(&freq, optval, optlen, &err);
 483                 if (fl == NULL)
 484                         return err;
 485                 sfl1 = kmalloc(sizeof(*sfl1), GFP_KERNEL);
 486
 487                 if (freq.flr_label) {
 488                         struct ip6_flowlabel *fl1 = NULL;
 489
 490                         err = -EEXIST;
 491                         read_lock_bh(&ip6_sk_fl_lock);
 492                         for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) {
 493                                 if (sfl->fl->label == freq.flr_label) {
 494                                         if (freq.flr_flags&IPV6_FL_F_EXCL) {
 495                                                 read_unlock_bh(&ip6_sk_fl_lock);
 496                                                 goto done;
 497                                         }
 498                                         fl1 = sfl->fl;
 499                                         atomic_inc(&fl1->users);
 500                                         break;
 501                                 }
 502                         }
 503                         read_unlock_bh(&ip6_sk_fl_lock);
 504
 505                         if (fl1 == NULL)
 506                                 fl1 = fl_lookup(freq.flr_label);
 507                         if (fl1) {
 508                                 err = -EEXIST;
 509                                 if (freq.flr_flags&IPV6_FL_F_EXCL)
 510                                         goto release;
 511                                 err = -EPERM;
 512                                 if (fl1->share == IPV6_FL_S_EXCL ||
 513                                     fl1->share != fl->share ||
 514                                     fl1->owner != fl->owner)
 515                                         goto release;
 516
 517                                 err = -EINVAL;
 518                                 if (!ipv6_addr_equal(&fl1->dst, &fl->dst) ||
 519                                     ipv6_opt_cmp(fl1->opt, fl->opt))
 520                                         goto release;
 521
 522                                 err = -ENOMEM;
 523                                 if (sfl1 == NULL)
 524                                         goto release;
 525                                 if (fl->linger > fl1->linger)
 526                                         fl1->linger = fl->linger;
 527                                 if ((long)(fl->expires - fl1->expires) > 0)
 528                                         fl1->expires = fl->expires;
 529                                 fl_link(np, sfl1, fl1);
 530                                 fl_free(fl);
 531                                 return 0;
 532
 533 release:
 534                                 fl_release(fl1);
 535                                 goto done;
 536                         }
 537                 }
 538                 err = -ENOENT;
 539                 if (!(freq.flr_flags&IPV6_FL_F_CREATE))
 540                         goto done;
 541
 542                 err = -ENOMEM;
 543                 if (sfl1 == NULL || (err = mem_check(sk)) != 0)
 544                         goto done;
 545
 546                 err = fl_intern(fl, freq.flr_label);
 547                 if (err)
 548                         goto done;
 549
 550                 if (!freq.flr_label) {
 551                         if (copy_to_user(&((struct in6_flowlabel_req __user *) optval)->flr_label,
 552                                          &fl->label, sizeof(fl->label))) {
 553                                 /* Intentionally ignore fault. */
 554                         }
 555                 }
 556
 557                 fl_link(np, sfl1, fl);
 558                 return 0;
 559
 560         default:
 561                 return -EINVAL;
 562         }
 563
 564 done:
 565         fl_free(fl);
 566         kfree(sfl1);
 567         return err;
 568 }
 569
 570 #ifdef CONFIG_PROC_FS
 571
 572 struct ip6fl_iter_state {
 573         int bucket;
 574 };
 575
 576 #define ip6fl_seq_private(seq)  ((struct ip6fl_iter_state *)(seq)->private)
 577
 578 static struct ip6_flowlabel *ip6fl_get_first(struct seq_file *seq)
 579 {
 580         struct ip6_flowlabel *fl = NULL;
 581         struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
 582
 583         for (state->bucket = 0; state->bucket <= FL_HASH_MASK; ++state->bucket) {
 584                 if (fl_ht[state->bucket]) {
 585                         fl = fl_ht[state->bucket];
 586                         break;
 587                 }
 588         }
 589         return fl;
 590 }
 591
 592 static struct ip6_flowlabel *ip6fl_get_next(struct seq_file *seq, struct ip6_flowlabel *fl)
 593 {
 594         struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
 595
 596         fl = fl->next;
 597         while (!fl) {
 598                 if (++state->bucket <= FL_HASH_MASK)
 599                         fl = fl_ht[state->bucket];
 600                 else
 601                         break;
 602         }
 603         return fl;
 604 }
 605
 606 static struct ip6_flowlabel *ip6fl_get_idx(struct seq_file *seq, loff_t pos)
 607 {
 608         struct ip6_flowlabel *fl = ip6fl_get_first(seq);
 609         if (fl)
 610                 while (pos && (fl = ip6fl_get_next(seq, fl)) != NULL)
 611                         --pos;
 612         return pos ? NULL : fl;
 613 }
 614
 615 static void *ip6fl_seq_start(struct seq_file *seq, loff_t *pos)
 616 {
 617         read_lock_bh(&ip6_fl_lock);
 618         return *pos ? ip6fl_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
 619 }
 620
 621 static void *ip6fl_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 622 {
 623         struct ip6_flowlabel *fl;
 624
 625         if (v == SEQ_START_TOKEN)
 626                 fl = ip6fl_get_first(seq);
 627         else
 628                 fl = ip6fl_get_next(seq, v);
 629         ++*pos;
 630         return fl;
 631 }
 632
 633 static void ip6fl_seq_stop(struct seq_file *seq, void *v)
 634 {
 635         read_unlock_bh(&ip6_fl_lock);
 636 }
 637
 638 static int ip6fl_seq_show(struct seq_file *seq, void *v)
 639 {
 640         if (v == SEQ_START_TOKEN)
 641                 seq_printf(seq, "%-5s %-1s %-6s %-6s %-6s %-8s %-32s %s\n",
 642                            "Label", "S", "Owner", "Users", "Linger", "Expires", "Dst", "Opt");
 643         else {
 644                 struct ip6_flowlabel *fl = v;
 645                 seq_printf(seq,
 646                            "%05X %-1d %-6d %-6d %-6ld %-8ld " NIP6_SEQFMT " %-4d\n",
 647                            (unsigned)ntohl(fl->label),
 648                            fl->share,
 649                            (unsigned)fl->owner,
 650                            atomic_read(&fl->users),
 651                            fl->linger/HZ,
 652                            (long)(fl->expires - jiffies)/HZ,
 653                            NIP6(fl->dst),
 654                            fl->opt ? fl->opt->opt_nflen : 0);
 655         }
 656         return 0;
 657 }
 658
 659 static const struct seq_operations ip6fl_seq_ops = {
 660         .start  =       ip6fl_seq_start,
 661         .next   =       ip6fl_seq_next,
 662         .stop   =       ip6fl_seq_stop,
 663         .show   =       ip6fl_seq_show,
 664 };
 665
 666 static int ip6fl_seq_open(struct inode *inode, struct file *file)
 667 {
 668         return seq_open_private(file, &ip6fl_seq_ops,
 669                         sizeof(struct ip6fl_iter_state));
 670 }
 671
 672 static const struct file_operations ip6fl_seq_fops = {
 673         .owner          =       THIS_MODULE,
 674         .open           =       ip6fl_seq_open,
 675         .read           =       seq_read,
 676         .llseek         =       seq_lseek,
 677         .release        =       seq_release_private,
 678 };
 679 #endif
 680
 681
 682 void ip6_flowlabel_init(void)
 683 {
 684 #ifdef CONFIG_PROC_FS
 685         proc_net_fops_create(&init_net, "ip6_flowlabel", S_IRUGO, &ip6fl_seq_fops);
 686 #endif
 687 }
 688
 689 void ip6_flowlabel_cleanup(void)
 690 {
 691         del_timer(&ip6_fl_gc_timer);
 692 #ifdef CONFIG_PROC_FS
 693         proc_net_remove(&init_net, "ip6_flowlabel");
 694 #endif
 695 }