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(&fl1->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 }