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 #include <linux/slab.h> 24 #include <linux/export.h> 25 26 #include <net/net_namespace.h> 27 #include <net/sock.h> 28 29 #include <net/ipv6.h> 30 #include <net/ndisc.h> 31 #include <net/protocol.h> 32 #include <net/ip6_route.h> 33 #include <net/addrconf.h> 34 #include <net/rawv6.h> 35 #include <net/icmp.h> 36 #include <net/transp_v6.h> 37 38 #include <asm/uaccess.h> 39 40 #define FL_MIN_LINGER 6 /* Minimal linger. It is set to 6sec specified 41 in old IPv6 RFC. Well, it was reasonable value. 42 */ 43 #define FL_MAX_LINGER 60 /* Maximal linger timeout */ 44 45 /* FL hash table */ 46 47 #define FL_MAX_PER_SOCK 32 48 #define FL_MAX_SIZE 4096 49 #define FL_HASH_MASK 255 50 #define FL_HASH(l) (ntohl(l)&FL_HASH_MASK) 51 52 static atomic_t fl_size = ATOMIC_INIT(0); 53 static struct ip6_flowlabel *fl_ht[FL_HASH_MASK+1]; 54 55 static void ip6_fl_gc(unsigned long dummy); 56 static DEFINE_TIMER(ip6_fl_gc_timer, ip6_fl_gc, 0, 0); 57 58 /* FL hash table lock: it protects only of GC */ 59 60 static DEFINE_RWLOCK(ip6_fl_lock); 61 62 /* Big socket sock */ 63 64 static DEFINE_RWLOCK(ip6_sk_fl_lock); 65 66 67 static inline struct ip6_flowlabel *__fl_lookup(struct net *net, __be32 label) 68 { 69 struct ip6_flowlabel *fl; 70 71 for (fl=fl_ht[FL_HASH(label)]; fl; fl = fl->next) { 72 if (fl->label == label && net_eq(fl->fl_net, net)) 73 return fl; 74 } 75 return NULL; 76 } 77 78 static struct ip6_flowlabel *fl_lookup(struct net *net, __be32 label) 79 { 80 struct ip6_flowlabel *fl; 81 82 read_lock_bh(&ip6_fl_lock); 83 fl = __fl_lookup(net, label); 84 if (fl) 85 atomic_inc(&fl->users); 86 read_unlock_bh(&ip6_fl_lock); 87 return fl; 88 } 89 90 91 static void fl_free(struct ip6_flowlabel *fl) 92 { 93 if (fl) { 94 release_net(fl->fl_net); 95 kfree(fl->opt); 96 } 97 kfree(fl); 98 } 99 100 static void fl_release(struct ip6_flowlabel *fl) 101 { 102 write_lock_bh(&ip6_fl_lock); 103 104 fl->lastuse = jiffies; 105 if (atomic_dec_and_test(&fl->users)) { 106 unsigned long ttd = fl->lastuse + fl->linger; 107 if (time_after(ttd, fl->expires)) 108 fl->expires = ttd; 109 ttd = fl->expires; 110 if (fl->opt && fl->share == IPV6_FL_S_EXCL) { 111 struct ipv6_txoptions *opt = fl->opt; 112 fl->opt = NULL; 113 kfree(opt); 114 } 115 if (!timer_pending(&ip6_fl_gc_timer) || 116 time_after(ip6_fl_gc_timer.expires, ttd)) 117 mod_timer(&ip6_fl_gc_timer, ttd); 118 } 119 write_unlock_bh(&ip6_fl_lock); 120 } 121 122 static void ip6_fl_gc(unsigned long dummy) 123 { 124 int i; 125 unsigned long now = jiffies; 126 unsigned long sched = 0; 127 128 write_lock(&ip6_fl_lock); 129 130 for (i=0; i<=FL_HASH_MASK; i++) { 131 struct ip6_flowlabel *fl, **flp; 132 flp = &fl_ht[i]; 133 while ((fl=*flp) != NULL) { 134 if (atomic_read(&fl->users) == 0) { 135 unsigned long ttd = fl->lastuse + fl->linger; 136 if (time_after(ttd, fl->expires)) 137 fl->expires = ttd; 138 ttd = fl->expires; 139 if (time_after_eq(now, ttd)) { 140 *flp = fl->next; 141 fl_free(fl); 142 atomic_dec(&fl_size); 143 continue; 144 } 145 if (!sched || time_before(ttd, sched)) 146 sched = ttd; 147 } 148 flp = &fl->next; 149 } 150 } 151 if (!sched && atomic_read(&fl_size)) 152 sched = now + FL_MAX_LINGER; 153 if (sched) { 154 mod_timer(&ip6_fl_gc_timer, sched); 155 } 156 write_unlock(&ip6_fl_lock); 157 } 158 159 static void __net_exit ip6_fl_purge(struct net *net) 160 { 161 int i; 162 163 write_lock(&ip6_fl_lock); 164 for (i = 0; i <= FL_HASH_MASK; i++) { 165 struct ip6_flowlabel *fl, **flp; 166 flp = &fl_ht[i]; 167 while ((fl = *flp) != NULL) { 168 if (net_eq(fl->fl_net, net) && 169 atomic_read(&fl->users) == 0) { 170 *flp = fl->next; 171 fl_free(fl); 172 atomic_dec(&fl_size); 173 continue; 174 } 175 flp = &fl->next; 176 } 177 } 178 write_unlock(&ip6_fl_lock); 179 } 180 181 static struct ip6_flowlabel *fl_intern(struct net *net, 182 struct ip6_flowlabel *fl, __be32 label) 183 { 184 struct ip6_flowlabel *lfl; 185 186 fl->label = label & IPV6_FLOWLABEL_MASK; 187 188 write_lock_bh(&ip6_fl_lock); 189 if (label == 0) { 190 for (;;) { 191 fl->label = htonl(net_random())&IPV6_FLOWLABEL_MASK; 192 if (fl->label) { 193 lfl = __fl_lookup(net, fl->label); 194 if (lfl == NULL) 195 break; 196 } 197 } 198 } else { 199 /* 200 * we dropper the ip6_fl_lock, so this entry could reappear 201 * and we need to recheck with it. 202 * 203 * OTOH no need to search the active socket first, like it is 204 * done in ipv6_flowlabel_opt - sock is locked, so new entry 205 * with the same label can only appear on another sock 206 */ 207 lfl = __fl_lookup(net, fl->label); 208 if (lfl != NULL) { 209 atomic_inc(&lfl->users); 210 write_unlock_bh(&ip6_fl_lock); 211 return lfl; 212 } 213 } 214 215 fl->lastuse = jiffies; 216 fl->next = fl_ht[FL_HASH(fl->label)]; 217 fl_ht[FL_HASH(fl->label)] = fl; 218 atomic_inc(&fl_size); 219 write_unlock_bh(&ip6_fl_lock); 220 return NULL; 221 } 222 223 224 225 /* Socket flowlabel lists */ 226 227 struct ip6_flowlabel * fl6_sock_lookup(struct sock *sk, __be32 label) 228 { 229 struct ipv6_fl_socklist *sfl; 230 struct ipv6_pinfo *np = inet6_sk(sk); 231 232 label &= IPV6_FLOWLABEL_MASK; 233 234 read_lock_bh(&ip6_sk_fl_lock); 235 for (sfl=np->ipv6_fl_list; sfl; sfl = sfl->next) { 236 struct ip6_flowlabel *fl = sfl->fl; 237 if (fl->label == label) { 238 fl->lastuse = jiffies; 239 atomic_inc(&fl->users); 240 read_unlock_bh(&ip6_sk_fl_lock); 241 return fl; 242 } 243 } 244 read_unlock_bh(&ip6_sk_fl_lock); 245 return NULL; 246 } 247 248 EXPORT_SYMBOL_GPL(fl6_sock_lookup); 249 250 void fl6_free_socklist(struct sock *sk) 251 { 252 struct ipv6_pinfo *np = inet6_sk(sk); 253 struct ipv6_fl_socklist *sfl; 254 255 while ((sfl = np->ipv6_fl_list) != NULL) { 256 np->ipv6_fl_list = sfl->next; 257 fl_release(sfl->fl); 258 kfree(sfl); 259 } 260 } 261 262 /* Service routines */ 263 264 265 /* 266 It is the only difficult place. flowlabel enforces equal headers 267 before and including routing header, however user may supply options 268 following rthdr. 269 */ 270 271 struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space, 272 struct ip6_flowlabel * fl, 273 struct ipv6_txoptions * fopt) 274 { 275 struct ipv6_txoptions * fl_opt = fl->opt; 276 277 if (fopt == NULL || fopt->opt_flen == 0) 278 return fl_opt; 279 280 if (fl_opt != NULL) { 281 opt_space->hopopt = fl_opt->hopopt; 282 opt_space->dst0opt = fl_opt->dst0opt; 283 opt_space->srcrt = fl_opt->srcrt; 284 opt_space->opt_nflen = fl_opt->opt_nflen; 285 } else { 286 if (fopt->opt_nflen == 0) 287 return fopt; 288 opt_space->hopopt = NULL; 289 opt_space->dst0opt = NULL; 290 opt_space->srcrt = NULL; 291 opt_space->opt_nflen = 0; 292 } 293 opt_space->dst1opt = fopt->dst1opt; 294 opt_space->opt_flen = fopt->opt_flen; 295 return opt_space; 296 } 297 298 static unsigned long check_linger(unsigned long ttl) 299 { 300 if (ttl < FL_MIN_LINGER) 301 return FL_MIN_LINGER*HZ; 302 if (ttl > FL_MAX_LINGER && !capable(CAP_NET_ADMIN)) 303 return 0; 304 return ttl*HZ; 305 } 306 307 static int fl6_renew(struct ip6_flowlabel *fl, unsigned long linger, unsigned long expires) 308 { 309 linger = check_linger(linger); 310 if (!linger) 311 return -EPERM; 312 expires = check_linger(expires); 313 if (!expires) 314 return -EPERM; 315 fl->lastuse = jiffies; 316 if (time_before(fl->linger, linger)) 317 fl->linger = linger; 318 if (time_before(expires, fl->linger)) 319 expires = fl->linger; 320 if (time_before(fl->expires, fl->lastuse + expires)) 321 fl->expires = fl->lastuse + expires; 322 return 0; 323 } 324 325 static struct ip6_flowlabel * 326 fl_create(struct net *net, struct sock *sk, struct in6_flowlabel_req *freq, 327 char __user *optval, int optlen, int *err_p) 328 { 329 struct ip6_flowlabel *fl = NULL; 330 int olen; 331 int addr_type; 332 int err; 333 334 olen = optlen - CMSG_ALIGN(sizeof(*freq)); 335 err = -EINVAL; 336 if (olen > 64 * 1024) 337 goto done; 338 339 err = -ENOMEM; 340 fl = kzalloc(sizeof(*fl), GFP_KERNEL); 341 if (fl == NULL) 342 goto done; 343 344 if (olen > 0) { 345 struct msghdr msg; 346 struct flowi6 flowi6; 347 int junk; 348 349 err = -ENOMEM; 350 fl->opt = kmalloc(sizeof(*fl->opt) + olen, GFP_KERNEL); 351 if (fl->opt == NULL) 352 goto done; 353 354 memset(fl->opt, 0, sizeof(*fl->opt)); 355 fl->opt->tot_len = sizeof(*fl->opt) + olen; 356 err = -EFAULT; 357 if (copy_from_user(fl->opt+1, optval+CMSG_ALIGN(sizeof(*freq)), olen)) 358 goto done; 359 360 msg.msg_controllen = olen; 361 msg.msg_control = (void*)(fl->opt+1); 362 memset(&flowi6, 0, sizeof(flowi6)); 363 364 err = datagram_send_ctl(net, sk, &msg, &flowi6, fl->opt, &junk, 365 &junk, &junk); 366 if (err) 367 goto done; 368 err = -EINVAL; 369 if (fl->opt->opt_flen) 370 goto done; 371 if (fl->opt->opt_nflen == 0) { 372 kfree(fl->opt); 373 fl->opt = NULL; 374 } 375 } 376 377 fl->fl_net = hold_net(net); 378 fl->expires = jiffies; 379 err = fl6_renew(fl, freq->flr_linger, freq->flr_expires); 380 if (err) 381 goto done; 382 fl->share = freq->flr_share; 383 addr_type = ipv6_addr_type(&freq->flr_dst); 384 if ((addr_type & IPV6_ADDR_MAPPED) || 385 addr_type == IPV6_ADDR_ANY) { 386 err = -EINVAL; 387 goto done; 388 } 389 fl->dst = freq->flr_dst; 390 atomic_set(&fl->users, 1); 391 switch (fl->share) { 392 case IPV6_FL_S_EXCL: 393 case IPV6_FL_S_ANY: 394 break; 395 case IPV6_FL_S_PROCESS: 396 fl->owner = current->pid; 397 break; 398 case IPV6_FL_S_USER: 399 fl->owner = current_euid(); 400 break; 401 default: 402 err = -EINVAL; 403 goto done; 404 } 405 return fl; 406 407 done: 408 fl_free(fl); 409 *err_p = err; 410 return NULL; 411 } 412 413 static int mem_check(struct sock *sk) 414 { 415 struct ipv6_pinfo *np = inet6_sk(sk); 416 struct ipv6_fl_socklist *sfl; 417 int room = FL_MAX_SIZE - atomic_read(&fl_size); 418 int count = 0; 419 420 if (room > FL_MAX_SIZE - FL_MAX_PER_SOCK) 421 return 0; 422 423 for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) 424 count++; 425 426 if (room <= 0 || 427 ((count >= FL_MAX_PER_SOCK || 428 (count > 0 && room < FL_MAX_SIZE/2) || room < FL_MAX_SIZE/4) && 429 !capable(CAP_NET_ADMIN))) 430 return -ENOBUFS; 431 432 return 0; 433 } 434 435 static int ipv6_hdr_cmp(struct ipv6_opt_hdr *h1, struct ipv6_opt_hdr *h2) 436 { 437 if (h1 == h2) 438 return 0; 439 if (h1 == NULL || h2 == NULL) 440 return 1; 441 if (h1->hdrlen != h2->hdrlen) 442 return 1; 443 return memcmp(h1+1, h2+1, ((h1->hdrlen+1)<<3) - sizeof(*h1)); 444 } 445 446 static int ipv6_opt_cmp(struct ipv6_txoptions *o1, struct ipv6_txoptions *o2) 447 { 448 if (o1 == o2) 449 return 0; 450 if (o1 == NULL || o2 == NULL) 451 return 1; 452 if (o1->opt_nflen != o2->opt_nflen) 453 return 1; 454 if (ipv6_hdr_cmp(o1->hopopt, o2->hopopt)) 455 return 1; 456 if (ipv6_hdr_cmp(o1->dst0opt, o2->dst0opt)) 457 return 1; 458 if (ipv6_hdr_cmp((struct ipv6_opt_hdr *)o1->srcrt, (struct ipv6_opt_hdr *)o2->srcrt)) 459 return 1; 460 return 0; 461 } 462 463 static inline void fl_link(struct ipv6_pinfo *np, struct ipv6_fl_socklist *sfl, 464 struct ip6_flowlabel *fl) 465 { 466 write_lock_bh(&ip6_sk_fl_lock); 467 sfl->fl = fl; 468 sfl->next = np->ipv6_fl_list; 469 np->ipv6_fl_list = sfl; 470 write_unlock_bh(&ip6_sk_fl_lock); 471 } 472 473 int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen) 474 { 475 int uninitialized_var(err); 476 struct net *net = sock_net(sk); 477 struct ipv6_pinfo *np = inet6_sk(sk); 478 struct in6_flowlabel_req freq; 479 struct ipv6_fl_socklist *sfl1=NULL; 480 struct ipv6_fl_socklist *sfl, **sflp; 481 struct ip6_flowlabel *fl, *fl1 = NULL; 482 483 484 if (optlen < sizeof(freq)) 485 return -EINVAL; 486 487 if (copy_from_user(&freq, optval, sizeof(freq))) 488 return -EFAULT; 489 490 switch (freq.flr_action) { 491 case IPV6_FL_A_PUT: 492 write_lock_bh(&ip6_sk_fl_lock); 493 for (sflp = &np->ipv6_fl_list; (sfl=*sflp)!=NULL; sflp = &sfl->next) { 494 if (sfl->fl->label == freq.flr_label) { 495 if (freq.flr_label == (np->flow_label&IPV6_FLOWLABEL_MASK)) 496 np->flow_label &= ~IPV6_FLOWLABEL_MASK; 497 *sflp = sfl->next; 498 write_unlock_bh(&ip6_sk_fl_lock); 499 fl_release(sfl->fl); 500 kfree(sfl); 501 return 0; 502 } 503 } 504 write_unlock_bh(&ip6_sk_fl_lock); 505 return -ESRCH; 506 507 case IPV6_FL_A_RENEW: 508 read_lock_bh(&ip6_sk_fl_lock); 509 for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) { 510 if (sfl->fl->label == freq.flr_label) { 511 err = fl6_renew(sfl->fl, freq.flr_linger, freq.flr_expires); 512 read_unlock_bh(&ip6_sk_fl_lock); 513 return err; 514 } 515 } 516 read_unlock_bh(&ip6_sk_fl_lock); 517 518 if (freq.flr_share == IPV6_FL_S_NONE && capable(CAP_NET_ADMIN)) { 519 fl = fl_lookup(net, freq.flr_label); 520 if (fl) { 521 err = fl6_renew(fl, freq.flr_linger, freq.flr_expires); 522 fl_release(fl); 523 return err; 524 } 525 } 526 return -ESRCH; 527 528 case IPV6_FL_A_GET: 529 if (freq.flr_label & ~IPV6_FLOWLABEL_MASK) 530 return -EINVAL; 531 532 fl = fl_create(net, sk, &freq, optval, optlen, &err); 533 if (fl == NULL) 534 return err; 535 sfl1 = kmalloc(sizeof(*sfl1), GFP_KERNEL); 536 537 if (freq.flr_label) { 538 err = -EEXIST; 539 read_lock_bh(&ip6_sk_fl_lock); 540 for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) { 541 if (sfl->fl->label == freq.flr_label) { 542 if (freq.flr_flags&IPV6_FL_F_EXCL) { 543 read_unlock_bh(&ip6_sk_fl_lock); 544 goto done; 545 } 546 fl1 = sfl->fl; 547 atomic_inc(&fl1->users); 548 break; 549 } 550 } 551 read_unlock_bh(&ip6_sk_fl_lock); 552 553 if (fl1 == NULL) 554 fl1 = fl_lookup(net, freq.flr_label); 555 if (fl1) { 556 recheck: 557 err = -EEXIST; 558 if (freq.flr_flags&IPV6_FL_F_EXCL) 559 goto release; 560 err = -EPERM; 561 if (fl1->share == IPV6_FL_S_EXCL || 562 fl1->share != fl->share || 563 fl1->owner != fl->owner) 564 goto release; 565 566 err = -EINVAL; 567 if (!ipv6_addr_equal(&fl1->dst, &fl->dst) || 568 ipv6_opt_cmp(fl1->opt, fl->opt)) 569 goto release; 570 571 err = -ENOMEM; 572 if (sfl1 == NULL) 573 goto release; 574 if (fl->linger > fl1->linger) 575 fl1->linger = fl->linger; 576 if ((long)(fl->expires - fl1->expires) > 0) 577 fl1->expires = fl->expires; 578 fl_link(np, sfl1, fl1); 579 fl_free(fl); 580 return 0; 581 582 release: 583 fl_release(fl1); 584 goto done; 585 } 586 } 587 err = -ENOENT; 588 if (!(freq.flr_flags&IPV6_FL_F_CREATE)) 589 goto done; 590 591 err = -ENOMEM; 592 if (sfl1 == NULL || (err = mem_check(sk)) != 0) 593 goto done; 594 595 fl1 = fl_intern(net, fl, freq.flr_label); 596 if (fl1 != NULL) 597 goto recheck; 598 599 if (!freq.flr_label) { 600 if (copy_to_user(&((struct in6_flowlabel_req __user *) optval)->flr_label, 601 &fl->label, sizeof(fl->label))) { 602 /* Intentionally ignore fault. */ 603 } 604 } 605 606 fl_link(np, sfl1, fl); 607 return 0; 608 609 default: 610 return -EINVAL; 611 } 612 613 done: 614 fl_free(fl); 615 kfree(sfl1); 616 return err; 617 } 618 619 #ifdef CONFIG_PROC_FS 620 621 struct ip6fl_iter_state { 622 struct seq_net_private p; 623 int bucket; 624 }; 625 626 #define ip6fl_seq_private(seq) ((struct ip6fl_iter_state *)(seq)->private) 627 628 static struct ip6_flowlabel *ip6fl_get_first(struct seq_file *seq) 629 { 630 struct ip6_flowlabel *fl = NULL; 631 struct ip6fl_iter_state *state = ip6fl_seq_private(seq); 632 struct net *net = seq_file_net(seq); 633 634 for (state->bucket = 0; state->bucket <= FL_HASH_MASK; ++state->bucket) { 635 fl = fl_ht[state->bucket]; 636 637 while (fl && !net_eq(fl->fl_net, net)) 638 fl = fl->next; 639 if (fl) 640 break; 641 } 642 return fl; 643 } 644 645 static struct ip6_flowlabel *ip6fl_get_next(struct seq_file *seq, struct ip6_flowlabel *fl) 646 { 647 struct ip6fl_iter_state *state = ip6fl_seq_private(seq); 648 struct net *net = seq_file_net(seq); 649 650 fl = fl->next; 651 try_again: 652 while (fl && !net_eq(fl->fl_net, net)) 653 fl = fl->next; 654 655 while (!fl) { 656 if (++state->bucket <= FL_HASH_MASK) { 657 fl = fl_ht[state->bucket]; 658 goto try_again; 659 } else 660 break; 661 } 662 return fl; 663 } 664 665 static struct ip6_flowlabel *ip6fl_get_idx(struct seq_file *seq, loff_t pos) 666 { 667 struct ip6_flowlabel *fl = ip6fl_get_first(seq); 668 if (fl) 669 while (pos && (fl = ip6fl_get_next(seq, fl)) != NULL) 670 --pos; 671 return pos ? NULL : fl; 672 } 673 674 static void *ip6fl_seq_start(struct seq_file *seq, loff_t *pos) 675 __acquires(ip6_fl_lock) 676 { 677 read_lock_bh(&ip6_fl_lock); 678 return *pos ? ip6fl_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 679 } 680 681 static void *ip6fl_seq_next(struct seq_file *seq, void *v, loff_t *pos) 682 { 683 struct ip6_flowlabel *fl; 684 685 if (v == SEQ_START_TOKEN) 686 fl = ip6fl_get_first(seq); 687 else 688 fl = ip6fl_get_next(seq, v); 689 ++*pos; 690 return fl; 691 } 692 693 static void ip6fl_seq_stop(struct seq_file *seq, void *v) 694 __releases(ip6_fl_lock) 695 { 696 read_unlock_bh(&ip6_fl_lock); 697 } 698 699 static int ip6fl_seq_show(struct seq_file *seq, void *v) 700 { 701 if (v == SEQ_START_TOKEN) 702 seq_printf(seq, "%-5s %-1s %-6s %-6s %-6s %-8s %-32s %s\n", 703 "Label", "S", "Owner", "Users", "Linger", "Expires", "Dst", "Opt"); 704 else { 705 struct ip6_flowlabel *fl = v; 706 seq_printf(seq, 707 "%05X %-1d %-6d %-6d %-6ld %-8ld %pi6 %-4d\n", 708 (unsigned)ntohl(fl->label), 709 fl->share, 710 (unsigned)fl->owner, 711 atomic_read(&fl->users), 712 fl->linger/HZ, 713 (long)(fl->expires - jiffies)/HZ, 714 &fl->dst, 715 fl->opt ? fl->opt->opt_nflen : 0); 716 } 717 return 0; 718 } 719 720 static const struct seq_operations ip6fl_seq_ops = { 721 .start = ip6fl_seq_start, 722 .next = ip6fl_seq_next, 723 .stop = ip6fl_seq_stop, 724 .show = ip6fl_seq_show, 725 }; 726 727 static int ip6fl_seq_open(struct inode *inode, struct file *file) 728 { 729 return seq_open_net(inode, file, &ip6fl_seq_ops, 730 sizeof(struct ip6fl_iter_state)); 731 } 732 733 static const struct file_operations ip6fl_seq_fops = { 734 .owner = THIS_MODULE, 735 .open = ip6fl_seq_open, 736 .read = seq_read, 737 .llseek = seq_lseek, 738 .release = seq_release_net, 739 }; 740 741 static int __net_init ip6_flowlabel_proc_init(struct net *net) 742 { 743 if (!proc_net_fops_create(net, "ip6_flowlabel", 744 S_IRUGO, &ip6fl_seq_fops)) 745 return -ENOMEM; 746 return 0; 747 } 748 749 static void __net_exit ip6_flowlabel_proc_fini(struct net *net) 750 { 751 proc_net_remove(net, "ip6_flowlabel"); 752 } 753 #else 754 static inline int ip6_flowlabel_proc_init(struct net *net) 755 { 756 return 0; 757 } 758 static inline void ip6_flowlabel_proc_fini(struct net *net) 759 { 760 } 761 #endif 762 763 static void __net_exit ip6_flowlabel_net_exit(struct net *net) 764 { 765 ip6_fl_purge(net); 766 ip6_flowlabel_proc_fini(net); 767 } 768 769 static struct pernet_operations ip6_flowlabel_net_ops = { 770 .init = ip6_flowlabel_proc_init, 771 .exit = ip6_flowlabel_net_exit, 772 }; 773 774 int ip6_flowlabel_init(void) 775 { 776 return register_pernet_subsys(&ip6_flowlabel_net_ops); 777 } 778 779 void ip6_flowlabel_cleanup(void) 780 { 781 del_timer(&ip6_fl_gc_timer); 782 unregister_pernet_subsys(&ip6_flowlabel_net_ops); 783 } 784