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 25 #include <net/net_namespace.h> 26 #include <net/sock.h> 27 28 #include <net/ipv6.h> 29 #include <net/ndisc.h> 30 #include <net/protocol.h> 31 #include <net/ip6_route.h> 32 #include <net/addrconf.h> 33 #include <net/rawv6.h> 34 #include <net/icmp.h> 35 #include <net/transp_v6.h> 36 37 #include <asm/uaccess.h> 38 39 #define FL_MIN_LINGER 6 /* Minimal linger. It is set to 6sec specified 40 in old IPv6 RFC. Well, it was reasonable value. 41 */ 42 #define FL_MAX_LINGER 60 /* Maximal linger timeout */ 43 44 /* FL hash table */ 45 46 #define FL_MAX_PER_SOCK 32 47 #define FL_MAX_SIZE 4096 48 #define FL_HASH_MASK 255 49 #define FL_HASH(l) (ntohl(l)&FL_HASH_MASK) 50 51 static atomic_t fl_size = ATOMIC_INIT(0); 52 static struct ip6_flowlabel *fl_ht[FL_HASH_MASK+1]; 53 54 static void ip6_fl_gc(unsigned long dummy); 55 static DEFINE_TIMER(ip6_fl_gc_timer, ip6_fl_gc, 0, 0); 56 57 /* FL hash table lock: it protects only of GC */ 58 59 static DEFINE_RWLOCK(ip6_fl_lock); 60 61 /* Big socket sock */ 62 63 static DEFINE_RWLOCK(ip6_sk_fl_lock); 64 65 66 static inline struct ip6_flowlabel *__fl_lookup(struct net *net, __be32 label) 67 { 68 struct ip6_flowlabel *fl; 69 70 for (fl=fl_ht[FL_HASH(label)]; fl; fl = fl->next) { 71 if (fl->label == label && net_eq(fl->fl_net, net)) 72 return fl; 73 } 74 return NULL; 75 } 76 77 static struct ip6_flowlabel *fl_lookup(struct net *net, __be32 label) 78 { 79 struct ip6_flowlabel *fl; 80 81 read_lock_bh(&ip6_fl_lock); 82 fl = __fl_lookup(net, label); 83 if (fl) 84 atomic_inc(&fl->users); 85 read_unlock_bh(&ip6_fl_lock); 86 return fl; 87 } 88 89 90 static void fl_free(struct ip6_flowlabel *fl) 91 { 92 if (fl) { 93 release_net(fl->fl_net); 94 kfree(fl->opt); 95 } 96 kfree(fl); 97 } 98 99 static void fl_release(struct ip6_flowlabel *fl) 100 { 101 write_lock_bh(&ip6_fl_lock); 102 103 fl->lastuse = jiffies; 104 if (atomic_dec_and_test(&fl->users)) { 105 unsigned long ttd = fl->lastuse + fl->linger; 106 if (time_after(ttd, fl->expires)) 107 fl->expires = ttd; 108 ttd = fl->expires; 109 if (fl->opt && fl->share == IPV6_FL_S_EXCL) { 110 struct ipv6_txoptions *opt = fl->opt; 111 fl->opt = NULL; 112 kfree(opt); 113 } 114 if (!timer_pending(&ip6_fl_gc_timer) || 115 time_after(ip6_fl_gc_timer.expires, ttd)) 116 mod_timer(&ip6_fl_gc_timer, ttd); 117 } 118 write_unlock_bh(&ip6_fl_lock); 119 } 120 121 static void ip6_fl_gc(unsigned long dummy) 122 { 123 int i; 124 unsigned long now = jiffies; 125 unsigned long sched = 0; 126 127 write_lock(&ip6_fl_lock); 128 129 for (i=0; i<=FL_HASH_MASK; i++) { 130 struct ip6_flowlabel *fl, **flp; 131 flp = &fl_ht[i]; 132 while ((fl=*flp) != NULL) { 133 if (atomic_read(&fl->users) == 0) { 134 unsigned long ttd = fl->lastuse + fl->linger; 135 if (time_after(ttd, fl->expires)) 136 fl->expires = ttd; 137 ttd = fl->expires; 138 if (time_after_eq(now, ttd)) { 139 *flp = fl->next; 140 fl_free(fl); 141 atomic_dec(&fl_size); 142 continue; 143 } 144 if (!sched || time_before(ttd, sched)) 145 sched = ttd; 146 } 147 flp = &fl->next; 148 } 149 } 150 if (!sched && atomic_read(&fl_size)) 151 sched = now + FL_MAX_LINGER; 152 if (sched) { 153 mod_timer(&ip6_fl_gc_timer, sched); 154 } 155 write_unlock(&ip6_fl_lock); 156 } 157 158 static void __net_exit ip6_fl_purge(struct net *net) 159 { 160 int i; 161 162 write_lock(&ip6_fl_lock); 163 for (i = 0; i <= FL_HASH_MASK; i++) { 164 struct ip6_flowlabel *fl, **flp; 165 flp = &fl_ht[i]; 166 while ((fl = *flp) != NULL) { 167 if (net_eq(fl->fl_net, net) && 168 atomic_read(&fl->users) == 0) { 169 *flp = fl->next; 170 fl_free(fl); 171 atomic_dec(&fl_size); 172 continue; 173 } 174 flp = &fl->next; 175 } 176 } 177 write_unlock(&ip6_fl_lock); 178 } 179 180 static struct ip6_flowlabel *fl_intern(struct net *net, 181 struct ip6_flowlabel *fl, __be32 label) 182 { 183 struct ip6_flowlabel *lfl; 184 185 fl->label = label & IPV6_FLOWLABEL_MASK; 186 187 write_lock_bh(&ip6_fl_lock); 188 if (label == 0) { 189 for (;;) { 190 fl->label = htonl(net_random())&IPV6_FLOWLABEL_MASK; 191 if (fl->label) { 192 lfl = __fl_lookup(net, fl->label); 193 if (lfl == NULL) 194 break; 195 } 196 } 197 } else { 198 /* 199 * we dropper the ip6_fl_lock, so this entry could reappear 200 * and we need to recheck with it. 201 * 202 * OTOH no need to search the active socket first, like it is 203 * done in ipv6_flowlabel_opt - sock is locked, so new entry 204 * with the same label can only appear on another sock 205 */ 206 lfl = __fl_lookup(net, fl->label); 207 if (lfl != NULL) { 208 atomic_inc(&lfl->users); 209 write_unlock_bh(&ip6_fl_lock); 210 return lfl; 211 } 212 } 213 214 fl->lastuse = jiffies; 215 fl->next = fl_ht[FL_HASH(fl->label)]; 216 fl_ht[FL_HASH(fl->label)] = fl; 217 atomic_inc(&fl_size); 218 write_unlock_bh(&ip6_fl_lock); 219 return NULL; 220 } 221 222 223 224 /* Socket flowlabel lists */ 225 226 struct ip6_flowlabel * fl6_sock_lookup(struct sock *sk, __be32 label) 227 { 228 struct ipv6_fl_socklist *sfl; 229 struct ipv6_pinfo *np = inet6_sk(sk); 230 231 label &= IPV6_FLOWLABEL_MASK; 232 233 read_lock_bh(&ip6_sk_fl_lock); 234 for (sfl=np->ipv6_fl_list; sfl; sfl = sfl->next) { 235 struct ip6_flowlabel *fl = sfl->fl; 236 if (fl->label == label) { 237 fl->lastuse = jiffies; 238 atomic_inc(&fl->users); 239 read_unlock_bh(&ip6_sk_fl_lock); 240 return fl; 241 } 242 } 243 read_unlock_bh(&ip6_sk_fl_lock); 244 return NULL; 245 } 246 247 EXPORT_SYMBOL_GPL(fl6_sock_lookup); 248 249 void fl6_free_socklist(struct sock *sk) 250 { 251 struct ipv6_pinfo *np = inet6_sk(sk); 252 struct ipv6_fl_socklist *sfl; 253 254 while ((sfl = np->ipv6_fl_list) != NULL) { 255 np->ipv6_fl_list = sfl->next; 256 fl_release(sfl->fl); 257 kfree(sfl); 258 } 259 } 260 261 /* Service routines */ 262 263 264 /* 265 It is the only difficult place. flowlabel enforces equal headers 266 before and including routing header, however user may supply options 267 following rthdr. 268 */ 269 270 struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space, 271 struct ip6_flowlabel * fl, 272 struct ipv6_txoptions * fopt) 273 { 274 struct ipv6_txoptions * fl_opt = fl->opt; 275 276 if (fopt == NULL || fopt->opt_flen == 0) 277 return fl_opt; 278 279 if (fl_opt != NULL) { 280 opt_space->hopopt = fl_opt->hopopt; 281 opt_space->dst0opt = fl_opt->dst0opt; 282 opt_space->srcrt = fl_opt->srcrt; 283 opt_space->opt_nflen = fl_opt->opt_nflen; 284 } else { 285 if (fopt->opt_nflen == 0) 286 return fopt; 287 opt_space->hopopt = NULL; 288 opt_space->dst0opt = NULL; 289 opt_space->srcrt = NULL; 290 opt_space->opt_nflen = 0; 291 } 292 opt_space->dst1opt = fopt->dst1opt; 293 opt_space->opt_flen = fopt->opt_flen; 294 return opt_space; 295 } 296 297 static unsigned long check_linger(unsigned long ttl) 298 { 299 if (ttl < FL_MIN_LINGER) 300 return FL_MIN_LINGER*HZ; 301 if (ttl > FL_MAX_LINGER && !capable(CAP_NET_ADMIN)) 302 return 0; 303 return ttl*HZ; 304 } 305 306 static int fl6_renew(struct ip6_flowlabel *fl, unsigned long linger, unsigned long expires) 307 { 308 linger = check_linger(linger); 309 if (!linger) 310 return -EPERM; 311 expires = check_linger(expires); 312 if (!expires) 313 return -EPERM; 314 fl->lastuse = jiffies; 315 if (time_before(fl->linger, linger)) 316 fl->linger = linger; 317 if (time_before(expires, fl->linger)) 318 expires = fl->linger; 319 if (time_before(fl->expires, fl->lastuse + expires)) 320 fl->expires = fl->lastuse + expires; 321 return 0; 322 } 323 324 static struct ip6_flowlabel * 325 fl_create(struct net *net, struct in6_flowlabel_req *freq, char __user *optval, 326 int optlen, int *err_p) 327 { 328 struct ip6_flowlabel *fl = NULL; 329 int olen; 330 int addr_type; 331 int err; 332 333 olen = optlen - CMSG_ALIGN(sizeof(*freq)); 334 err = -EINVAL; 335 if (olen > 64 * 1024) 336 goto done; 337 338 err = -ENOMEM; 339 fl = kzalloc(sizeof(*fl), GFP_KERNEL); 340 if (fl == NULL) 341 goto done; 342 343 if (olen > 0) { 344 struct msghdr msg; 345 struct flowi6 flowi6; 346 int junk; 347 348 err = -ENOMEM; 349 fl->opt = kmalloc(sizeof(*fl->opt) + olen, GFP_KERNEL); 350 if (fl->opt == NULL) 351 goto done; 352 353 memset(fl->opt, 0, sizeof(*fl->opt)); 354 fl->opt->tot_len = sizeof(*fl->opt) + olen; 355 err = -EFAULT; 356 if (copy_from_user(fl->opt+1, optval+CMSG_ALIGN(sizeof(*freq)), olen)) 357 goto done; 358 359 msg.msg_controllen = olen; 360 msg.msg_control = (void*)(fl->opt+1); 361 memset(&flowi6, 0, sizeof(flowi6)); 362 363 err = datagram_send_ctl(net, &msg, &flowi6, fl->opt, &junk, 364 &junk, &junk); 365 if (err) 366 goto done; 367 err = -EINVAL; 368 if (fl->opt->opt_flen) 369 goto done; 370 if (fl->opt->opt_nflen == 0) { 371 kfree(fl->opt); 372 fl->opt = NULL; 373 } 374 } 375 376 fl->fl_net = hold_net(net); 377 fl->expires = jiffies; 378 err = fl6_renew(fl, freq->flr_linger, freq->flr_expires); 379 if (err) 380 goto done; 381 fl->share = freq->flr_share; 382 addr_type = ipv6_addr_type(&freq->flr_dst); 383 if ((addr_type & IPV6_ADDR_MAPPED) || 384 addr_type == IPV6_ADDR_ANY) { 385 err = -EINVAL; 386 goto done; 387 } 388 ipv6_addr_copy(&fl->dst, &freq->flr_dst); 389 atomic_set(&fl->users, 1); 390 switch (fl->share) { 391 case IPV6_FL_S_EXCL: 392 case IPV6_FL_S_ANY: 393 break; 394 case IPV6_FL_S_PROCESS: 395 fl->owner = current->pid; 396 break; 397 case IPV6_FL_S_USER: 398 fl->owner = current_euid(); 399 break; 400 default: 401 err = -EINVAL; 402 goto done; 403 } 404 return fl; 405 406 done: 407 fl_free(fl); 408 *err_p = err; 409 return NULL; 410 } 411 412 static int mem_check(struct sock *sk) 413 { 414 struct ipv6_pinfo *np = inet6_sk(sk); 415 struct ipv6_fl_socklist *sfl; 416 int room = FL_MAX_SIZE - atomic_read(&fl_size); 417 int count = 0; 418 419 if (room > FL_MAX_SIZE - FL_MAX_PER_SOCK) 420 return 0; 421 422 for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) 423 count++; 424 425 if (room <= 0 || 426 ((count >= FL_MAX_PER_SOCK || 427 (count > 0 && room < FL_MAX_SIZE/2) || room < FL_MAX_SIZE/4) && 428 !capable(CAP_NET_ADMIN))) 429 return -ENOBUFS; 430 431 return 0; 432 } 433 434 static int ipv6_hdr_cmp(struct ipv6_opt_hdr *h1, struct ipv6_opt_hdr *h2) 435 { 436 if (h1 == h2) 437 return 0; 438 if (h1 == NULL || h2 == NULL) 439 return 1; 440 if (h1->hdrlen != h2->hdrlen) 441 return 1; 442 return memcmp(h1+1, h2+1, ((h1->hdrlen+1)<<3) - sizeof(*h1)); 443 } 444 445 static int ipv6_opt_cmp(struct ipv6_txoptions *o1, struct ipv6_txoptions *o2) 446 { 447 if (o1 == o2) 448 return 0; 449 if (o1 == NULL || o2 == NULL) 450 return 1; 451 if (o1->opt_nflen != o2->opt_nflen) 452 return 1; 453 if (ipv6_hdr_cmp(o1->hopopt, o2->hopopt)) 454 return 1; 455 if (ipv6_hdr_cmp(o1->dst0opt, o2->dst0opt)) 456 return 1; 457 if (ipv6_hdr_cmp((struct ipv6_opt_hdr *)o1->srcrt, (struct ipv6_opt_hdr *)o2->srcrt)) 458 return 1; 459 return 0; 460 } 461 462 static inline void fl_link(struct ipv6_pinfo *np, struct ipv6_fl_socklist *sfl, 463 struct ip6_flowlabel *fl) 464 { 465 write_lock_bh(&ip6_sk_fl_lock); 466 sfl->fl = fl; 467 sfl->next = np->ipv6_fl_list; 468 np->ipv6_fl_list = sfl; 469 write_unlock_bh(&ip6_sk_fl_lock); 470 } 471 472 int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen) 473 { 474 int uninitialized_var(err); 475 struct net *net = sock_net(sk); 476 struct ipv6_pinfo *np = inet6_sk(sk); 477 struct in6_flowlabel_req freq; 478 struct ipv6_fl_socklist *sfl1=NULL; 479 struct ipv6_fl_socklist *sfl, **sflp; 480 struct ip6_flowlabel *fl, *fl1 = NULL; 481 482 483 if (optlen < sizeof(freq)) 484 return -EINVAL; 485 486 if (copy_from_user(&freq, optval, sizeof(freq))) 487 return -EFAULT; 488 489 switch (freq.flr_action) { 490 case IPV6_FL_A_PUT: 491 write_lock_bh(&ip6_sk_fl_lock); 492 for (sflp = &np->ipv6_fl_list; (sfl=*sflp)!=NULL; sflp = &sfl->next) { 493 if (sfl->fl->label == freq.flr_label) { 494 if (freq.flr_label == (np->flow_label&IPV6_FLOWLABEL_MASK)) 495 np->flow_label &= ~IPV6_FLOWLABEL_MASK; 496 *sflp = sfl->next; 497 write_unlock_bh(&ip6_sk_fl_lock); 498 fl_release(sfl->fl); 499 kfree(sfl); 500 return 0; 501 } 502 } 503 write_unlock_bh(&ip6_sk_fl_lock); 504 return -ESRCH; 505 506 case IPV6_FL_A_RENEW: 507 read_lock_bh(&ip6_sk_fl_lock); 508 for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) { 509 if (sfl->fl->label == freq.flr_label) { 510 err = fl6_renew(sfl->fl, freq.flr_linger, freq.flr_expires); 511 read_unlock_bh(&ip6_sk_fl_lock); 512 return err; 513 } 514 } 515 read_unlock_bh(&ip6_sk_fl_lock); 516 517 if (freq.flr_share == IPV6_FL_S_NONE && capable(CAP_NET_ADMIN)) { 518 fl = fl_lookup(net, freq.flr_label); 519 if (fl) { 520 err = fl6_renew(fl, freq.flr_linger, freq.flr_expires); 521 fl_release(fl); 522 return err; 523 } 524 } 525 return -ESRCH; 526 527 case IPV6_FL_A_GET: 528 if (freq.flr_label & ~IPV6_FLOWLABEL_MASK) 529 return -EINVAL; 530 531 fl = fl_create(net, &freq, optval, optlen, &err); 532 if (fl == NULL) 533 return err; 534 sfl1 = kmalloc(sizeof(*sfl1), GFP_KERNEL); 535 536 if (freq.flr_label) { 537 err = -EEXIST; 538 read_lock_bh(&ip6_sk_fl_lock); 539 for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) { 540 if (sfl->fl->label == freq.flr_label) { 541 if (freq.flr_flags&IPV6_FL_F_EXCL) { 542 read_unlock_bh(&ip6_sk_fl_lock); 543 goto done; 544 } 545 fl1 = sfl->fl; 546 atomic_inc(&fl1->users); 547 break; 548 } 549 } 550 read_unlock_bh(&ip6_sk_fl_lock); 551 552 if (fl1 == NULL) 553 fl1 = fl_lookup(net, freq.flr_label); 554 if (fl1) { 555 recheck: 556 err = -EEXIST; 557 if (freq.flr_flags&IPV6_FL_F_EXCL) 558 goto release; 559 err = -EPERM; 560 if (fl1->share == IPV6_FL_S_EXCL || 561 fl1->share != fl->share || 562 fl1->owner != fl->owner) 563 goto release; 564 565 err = -EINVAL; 566 if (!ipv6_addr_equal(&fl1->dst, &fl->dst) || 567 ipv6_opt_cmp(fl1->opt, fl->opt)) 568 goto release; 569 570 err = -ENOMEM; 571 if (sfl1 == NULL) 572 goto release; 573 if (fl->linger > fl1->linger) 574 fl1->linger = fl->linger; 575 if ((long)(fl->expires - fl1->expires) > 0) 576 fl1->expires = fl->expires; 577 fl_link(np, sfl1, fl1); 578 fl_free(fl); 579 return 0; 580 581 release: 582 fl_release(fl1); 583 goto done; 584 } 585 } 586 err = -ENOENT; 587 if (!(freq.flr_flags&IPV6_FL_F_CREATE)) 588 goto done; 589 590 err = -ENOMEM; 591 if (sfl1 == NULL || (err = mem_check(sk)) != 0) 592 goto done; 593 594 fl1 = fl_intern(net, fl, freq.flr_label); 595 if (fl1 != NULL) 596 goto recheck; 597 598 if (!freq.flr_label) { 599 if (copy_to_user(&((struct in6_flowlabel_req __user *) optval)->flr_label, 600 &fl->label, sizeof(fl->label))) { 601 /* Intentionally ignore fault. */ 602 } 603 } 604 605 fl_link(np, sfl1, fl); 606 return 0; 607 608 default: 609 return -EINVAL; 610 } 611 612 done: 613 fl_free(fl); 614 kfree(sfl1); 615 return err; 616 } 617 618 #ifdef CONFIG_PROC_FS 619 620 struct ip6fl_iter_state { 621 struct seq_net_private p; 622 int bucket; 623 }; 624 625 #define ip6fl_seq_private(seq) ((struct ip6fl_iter_state *)(seq)->private) 626 627 static struct ip6_flowlabel *ip6fl_get_first(struct seq_file *seq) 628 { 629 struct ip6_flowlabel *fl = NULL; 630 struct ip6fl_iter_state *state = ip6fl_seq_private(seq); 631 struct net *net = seq_file_net(seq); 632 633 for (state->bucket = 0; state->bucket <= FL_HASH_MASK; ++state->bucket) { 634 fl = fl_ht[state->bucket]; 635 636 while (fl && !net_eq(fl->fl_net, net)) 637 fl = fl->next; 638 if (fl) 639 break; 640 } 641 return fl; 642 } 643 644 static struct ip6_flowlabel *ip6fl_get_next(struct seq_file *seq, struct ip6_flowlabel *fl) 645 { 646 struct ip6fl_iter_state *state = ip6fl_seq_private(seq); 647 struct net *net = seq_file_net(seq); 648 649 fl = fl->next; 650 try_again: 651 while (fl && !net_eq(fl->fl_net, net)) 652 fl = fl->next; 653 654 while (!fl) { 655 if (++state->bucket <= FL_HASH_MASK) { 656 fl = fl_ht[state->bucket]; 657 goto try_again; 658 } else 659 break; 660 } 661 return fl; 662 } 663 664 static struct ip6_flowlabel *ip6fl_get_idx(struct seq_file *seq, loff_t pos) 665 { 666 struct ip6_flowlabel *fl = ip6fl_get_first(seq); 667 if (fl) 668 while (pos && (fl = ip6fl_get_next(seq, fl)) != NULL) 669 --pos; 670 return pos ? NULL : fl; 671 } 672 673 static void *ip6fl_seq_start(struct seq_file *seq, loff_t *pos) 674 __acquires(ip6_fl_lock) 675 { 676 read_lock_bh(&ip6_fl_lock); 677 return *pos ? ip6fl_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 678 } 679 680 static void *ip6fl_seq_next(struct seq_file *seq, void *v, loff_t *pos) 681 { 682 struct ip6_flowlabel *fl; 683 684 if (v == SEQ_START_TOKEN) 685 fl = ip6fl_get_first(seq); 686 else 687 fl = ip6fl_get_next(seq, v); 688 ++*pos; 689 return fl; 690 } 691 692 static void ip6fl_seq_stop(struct seq_file *seq, void *v) 693 __releases(ip6_fl_lock) 694 { 695 read_unlock_bh(&ip6_fl_lock); 696 } 697 698 static int ip6fl_seq_show(struct seq_file *seq, void *v) 699 { 700 if (v == SEQ_START_TOKEN) 701 seq_printf(seq, "%-5s %-1s %-6s %-6s %-6s %-8s %-32s %s\n", 702 "Label", "S", "Owner", "Users", "Linger", "Expires", "Dst", "Opt"); 703 else { 704 struct ip6_flowlabel *fl = v; 705 seq_printf(seq, 706 "%05X %-1d %-6d %-6d %-6ld %-8ld %pi6 %-4d\n", 707 (unsigned)ntohl(fl->label), 708 fl->share, 709 (unsigned)fl->owner, 710 atomic_read(&fl->users), 711 fl->linger/HZ, 712 (long)(fl->expires - jiffies)/HZ, 713 &fl->dst, 714 fl->opt ? fl->opt->opt_nflen : 0); 715 } 716 return 0; 717 } 718 719 static const struct seq_operations ip6fl_seq_ops = { 720 .start = ip6fl_seq_start, 721 .next = ip6fl_seq_next, 722 .stop = ip6fl_seq_stop, 723 .show = ip6fl_seq_show, 724 }; 725 726 static int ip6fl_seq_open(struct inode *inode, struct file *file) 727 { 728 return seq_open_net(inode, file, &ip6fl_seq_ops, 729 sizeof(struct ip6fl_iter_state)); 730 } 731 732 static const struct file_operations ip6fl_seq_fops = { 733 .owner = THIS_MODULE, 734 .open = ip6fl_seq_open, 735 .read = seq_read, 736 .llseek = seq_lseek, 737 .release = seq_release_net, 738 }; 739 740 static int __net_init ip6_flowlabel_proc_init(struct net *net) 741 { 742 if (!proc_net_fops_create(net, "ip6_flowlabel", 743 S_IRUGO, &ip6fl_seq_fops)) 744 return -ENOMEM; 745 return 0; 746 } 747 748 static void __net_exit ip6_flowlabel_proc_fini(struct net *net) 749 { 750 proc_net_remove(net, "ip6_flowlabel"); 751 } 752 #else 753 static inline int ip6_flowlabel_proc_init(struct net *net) 754 { 755 return 0; 756 } 757 static inline void ip6_flowlabel_proc_fini(struct net *net) 758 { 759 } 760 #endif 761 762 static void __net_exit ip6_flowlabel_net_exit(struct net *net) 763 { 764 ip6_fl_purge(net); 765 ip6_flowlabel_proc_fini(net); 766 } 767 768 static struct pernet_operations ip6_flowlabel_net_ops = { 769 .init = ip6_flowlabel_proc_init, 770 .exit = ip6_flowlabel_net_exit, 771 }; 772 773 int ip6_flowlabel_init(void) 774 { 775 return register_pernet_subsys(&ip6_flowlabel_net_ops); 776 } 777 778 void ip6_flowlabel_cleanup(void) 779 { 780 del_timer(&ip6_fl_gc_timer); 781 unregister_pernet_subsys(&ip6_flowlabel_net_ops); 782 } 783