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 flowi flowi; 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 flowi.oif = 0; 362 363 err = datagram_send_ctl(net, &msg, &flowi, fl->opt, &junk, &junk); 364 if (err) 365 goto done; 366 err = -EINVAL; 367 if (fl->opt->opt_flen) 368 goto done; 369 if (fl->opt->opt_nflen == 0) { 370 kfree(fl->opt); 371 fl->opt = NULL; 372 } 373 } 374 375 fl->fl_net = hold_net(net); 376 fl->expires = jiffies; 377 err = fl6_renew(fl, freq->flr_linger, freq->flr_expires); 378 if (err) 379 goto done; 380 fl->share = freq->flr_share; 381 addr_type = ipv6_addr_type(&freq->flr_dst); 382 if ((addr_type & IPV6_ADDR_MAPPED) || 383 addr_type == IPV6_ADDR_ANY) { 384 err = -EINVAL; 385 goto done; 386 } 387 ipv6_addr_copy(&fl->dst, &freq->flr_dst); 388 atomic_set(&fl->users, 1); 389 switch (fl->share) { 390 case IPV6_FL_S_EXCL: 391 case IPV6_FL_S_ANY: 392 break; 393 case IPV6_FL_S_PROCESS: 394 fl->owner = current->pid; 395 break; 396 case IPV6_FL_S_USER: 397 fl->owner = current_euid(); 398 break; 399 default: 400 err = -EINVAL; 401 goto done; 402 } 403 return fl; 404 405 done: 406 fl_free(fl); 407 *err_p = err; 408 return NULL; 409 } 410 411 static int mem_check(struct sock *sk) 412 { 413 struct ipv6_pinfo *np = inet6_sk(sk); 414 struct ipv6_fl_socklist *sfl; 415 int room = FL_MAX_SIZE - atomic_read(&fl_size); 416 int count = 0; 417 418 if (room > FL_MAX_SIZE - FL_MAX_PER_SOCK) 419 return 0; 420 421 for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) 422 count++; 423 424 if (room <= 0 || 425 ((count >= FL_MAX_PER_SOCK || 426 (count > 0 && room < FL_MAX_SIZE/2) || room < FL_MAX_SIZE/4) && 427 !capable(CAP_NET_ADMIN))) 428 return -ENOBUFS; 429 430 return 0; 431 } 432 433 static int ipv6_hdr_cmp(struct ipv6_opt_hdr *h1, struct ipv6_opt_hdr *h2) 434 { 435 if (h1 == h2) 436 return 0; 437 if (h1 == NULL || h2 == NULL) 438 return 1; 439 if (h1->hdrlen != h2->hdrlen) 440 return 1; 441 return memcmp(h1+1, h2+1, ((h1->hdrlen+1)<<3) - sizeof(*h1)); 442 } 443 444 static int ipv6_opt_cmp(struct ipv6_txoptions *o1, struct ipv6_txoptions *o2) 445 { 446 if (o1 == o2) 447 return 0; 448 if (o1 == NULL || o2 == NULL) 449 return 1; 450 if (o1->opt_nflen != o2->opt_nflen) 451 return 1; 452 if (ipv6_hdr_cmp(o1->hopopt, o2->hopopt)) 453 return 1; 454 if (ipv6_hdr_cmp(o1->dst0opt, o2->dst0opt)) 455 return 1; 456 if (ipv6_hdr_cmp((struct ipv6_opt_hdr *)o1->srcrt, (struct ipv6_opt_hdr *)o2->srcrt)) 457 return 1; 458 return 0; 459 } 460 461 static inline void fl_link(struct ipv6_pinfo *np, struct ipv6_fl_socklist *sfl, 462 struct ip6_flowlabel *fl) 463 { 464 write_lock_bh(&ip6_sk_fl_lock); 465 sfl->fl = fl; 466 sfl->next = np->ipv6_fl_list; 467 np->ipv6_fl_list = sfl; 468 write_unlock_bh(&ip6_sk_fl_lock); 469 } 470 471 int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen) 472 { 473 int uninitialized_var(err); 474 struct net *net = sock_net(sk); 475 struct ipv6_pinfo *np = inet6_sk(sk); 476 struct in6_flowlabel_req freq; 477 struct ipv6_fl_socklist *sfl1=NULL; 478 struct ipv6_fl_socklist *sfl, **sflp; 479 struct ip6_flowlabel *fl, *fl1 = NULL; 480 481 482 if (optlen < sizeof(freq)) 483 return -EINVAL; 484 485 if (copy_from_user(&freq, optval, sizeof(freq))) 486 return -EFAULT; 487 488 switch (freq.flr_action) { 489 case IPV6_FL_A_PUT: 490 write_lock_bh(&ip6_sk_fl_lock); 491 for (sflp = &np->ipv6_fl_list; (sfl=*sflp)!=NULL; sflp = &sfl->next) { 492 if (sfl->fl->label == freq.flr_label) { 493 if (freq.flr_label == (np->flow_label&IPV6_FLOWLABEL_MASK)) 494 np->flow_label &= ~IPV6_FLOWLABEL_MASK; 495 *sflp = sfl->next; 496 write_unlock_bh(&ip6_sk_fl_lock); 497 fl_release(sfl->fl); 498 kfree(sfl); 499 return 0; 500 } 501 } 502 write_unlock_bh(&ip6_sk_fl_lock); 503 return -ESRCH; 504 505 case IPV6_FL_A_RENEW: 506 read_lock_bh(&ip6_sk_fl_lock); 507 for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) { 508 if (sfl->fl->label == freq.flr_label) { 509 err = fl6_renew(sfl->fl, freq.flr_linger, freq.flr_expires); 510 read_unlock_bh(&ip6_sk_fl_lock); 511 return err; 512 } 513 } 514 read_unlock_bh(&ip6_sk_fl_lock); 515 516 if (freq.flr_share == IPV6_FL_S_NONE && capable(CAP_NET_ADMIN)) { 517 fl = fl_lookup(net, freq.flr_label); 518 if (fl) { 519 err = fl6_renew(fl, freq.flr_linger, freq.flr_expires); 520 fl_release(fl); 521 return err; 522 } 523 } 524 return -ESRCH; 525 526 case IPV6_FL_A_GET: 527 if (freq.flr_label & ~IPV6_FLOWLABEL_MASK) 528 return -EINVAL; 529 530 fl = fl_create(net, &freq, optval, optlen, &err); 531 if (fl == NULL) 532 return err; 533 sfl1 = kmalloc(sizeof(*sfl1), GFP_KERNEL); 534 535 if (freq.flr_label) { 536 err = -EEXIST; 537 read_lock_bh(&ip6_sk_fl_lock); 538 for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) { 539 if (sfl->fl->label == freq.flr_label) { 540 if (freq.flr_flags&IPV6_FL_F_EXCL) { 541 read_unlock_bh(&ip6_sk_fl_lock); 542 goto done; 543 } 544 fl1 = sfl->fl; 545 atomic_inc(&fl1->users); 546 break; 547 } 548 } 549 read_unlock_bh(&ip6_sk_fl_lock); 550 551 if (fl1 == NULL) 552 fl1 = fl_lookup(net, freq.flr_label); 553 if (fl1) { 554 recheck: 555 err = -EEXIST; 556 if (freq.flr_flags&IPV6_FL_F_EXCL) 557 goto release; 558 err = -EPERM; 559 if (fl1->share == IPV6_FL_S_EXCL || 560 fl1->share != fl->share || 561 fl1->owner != fl->owner) 562 goto release; 563 564 err = -EINVAL; 565 if (!ipv6_addr_equal(&fl1->dst, &fl->dst) || 566 ipv6_opt_cmp(fl1->opt, fl->opt)) 567 goto release; 568 569 err = -ENOMEM; 570 if (sfl1 == NULL) 571 goto release; 572 if (fl->linger > fl1->linger) 573 fl1->linger = fl->linger; 574 if ((long)(fl->expires - fl1->expires) > 0) 575 fl1->expires = fl->expires; 576 fl_link(np, sfl1, fl1); 577 fl_free(fl); 578 return 0; 579 580 release: 581 fl_release(fl1); 582 goto done; 583 } 584 } 585 err = -ENOENT; 586 if (!(freq.flr_flags&IPV6_FL_F_CREATE)) 587 goto done; 588 589 err = -ENOMEM; 590 if (sfl1 == NULL || (err = mem_check(sk)) != 0) 591 goto done; 592 593 fl1 = fl_intern(net, fl, freq.flr_label); 594 if (fl1 != NULL) 595 goto recheck; 596 597 if (!freq.flr_label) { 598 if (copy_to_user(&((struct in6_flowlabel_req __user *) optval)->flr_label, 599 &fl->label, sizeof(fl->label))) { 600 /* Intentionally ignore fault. */ 601 } 602 } 603 604 fl_link(np, sfl1, fl); 605 return 0; 606 607 default: 608 return -EINVAL; 609 } 610 611 done: 612 fl_free(fl); 613 kfree(sfl1); 614 return err; 615 } 616 617 #ifdef CONFIG_PROC_FS 618 619 struct ip6fl_iter_state { 620 struct seq_net_private p; 621 int bucket; 622 }; 623 624 #define ip6fl_seq_private(seq) ((struct ip6fl_iter_state *)(seq)->private) 625 626 static struct ip6_flowlabel *ip6fl_get_first(struct seq_file *seq) 627 { 628 struct ip6_flowlabel *fl = NULL; 629 struct ip6fl_iter_state *state = ip6fl_seq_private(seq); 630 struct net *net = seq_file_net(seq); 631 632 for (state->bucket = 0; state->bucket <= FL_HASH_MASK; ++state->bucket) { 633 fl = fl_ht[state->bucket]; 634 635 while (fl && !net_eq(fl->fl_net, net)) 636 fl = fl->next; 637 if (fl) 638 break; 639 } 640 return fl; 641 } 642 643 static struct ip6_flowlabel *ip6fl_get_next(struct seq_file *seq, struct ip6_flowlabel *fl) 644 { 645 struct ip6fl_iter_state *state = ip6fl_seq_private(seq); 646 struct net *net = seq_file_net(seq); 647 648 fl = fl->next; 649 try_again: 650 while (fl && !net_eq(fl->fl_net, net)) 651 fl = fl->next; 652 653 while (!fl) { 654 if (++state->bucket <= FL_HASH_MASK) { 655 fl = fl_ht[state->bucket]; 656 goto try_again; 657 } else 658 break; 659 } 660 return fl; 661 } 662 663 static struct ip6_flowlabel *ip6fl_get_idx(struct seq_file *seq, loff_t pos) 664 { 665 struct ip6_flowlabel *fl = ip6fl_get_first(seq); 666 if (fl) 667 while (pos && (fl = ip6fl_get_next(seq, fl)) != NULL) 668 --pos; 669 return pos ? NULL : fl; 670 } 671 672 static void *ip6fl_seq_start(struct seq_file *seq, loff_t *pos) 673 __acquires(ip6_fl_lock) 674 { 675 read_lock_bh(&ip6_fl_lock); 676 return *pos ? ip6fl_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 677 } 678 679 static void *ip6fl_seq_next(struct seq_file *seq, void *v, loff_t *pos) 680 { 681 struct ip6_flowlabel *fl; 682 683 if (v == SEQ_START_TOKEN) 684 fl = ip6fl_get_first(seq); 685 else 686 fl = ip6fl_get_next(seq, v); 687 ++*pos; 688 return fl; 689 } 690 691 static void ip6fl_seq_stop(struct seq_file *seq, void *v) 692 __releases(ip6_fl_lock) 693 { 694 read_unlock_bh(&ip6_fl_lock); 695 } 696 697 static int ip6fl_seq_show(struct seq_file *seq, void *v) 698 { 699 if (v == SEQ_START_TOKEN) 700 seq_printf(seq, "%-5s %-1s %-6s %-6s %-6s %-8s %-32s %s\n", 701 "Label", "S", "Owner", "Users", "Linger", "Expires", "Dst", "Opt"); 702 else { 703 struct ip6_flowlabel *fl = v; 704 seq_printf(seq, 705 "%05X %-1d %-6d %-6d %-6ld %-8ld %pi6 %-4d\n", 706 (unsigned)ntohl(fl->label), 707 fl->share, 708 (unsigned)fl->owner, 709 atomic_read(&fl->users), 710 fl->linger/HZ, 711 (long)(fl->expires - jiffies)/HZ, 712 &fl->dst, 713 fl->opt ? fl->opt->opt_nflen : 0); 714 } 715 return 0; 716 } 717 718 static const struct seq_operations ip6fl_seq_ops = { 719 .start = ip6fl_seq_start, 720 .next = ip6fl_seq_next, 721 .stop = ip6fl_seq_stop, 722 .show = ip6fl_seq_show, 723 }; 724 725 static int ip6fl_seq_open(struct inode *inode, struct file *file) 726 { 727 return seq_open_net(inode, file, &ip6fl_seq_ops, 728 sizeof(struct ip6fl_iter_state)); 729 } 730 731 static const struct file_operations ip6fl_seq_fops = { 732 .owner = THIS_MODULE, 733 .open = ip6fl_seq_open, 734 .read = seq_read, 735 .llseek = seq_lseek, 736 .release = seq_release_net, 737 }; 738 739 static int __net_init ip6_flowlabel_proc_init(struct net *net) 740 { 741 if (!proc_net_fops_create(net, "ip6_flowlabel", 742 S_IRUGO, &ip6fl_seq_fops)) 743 return -ENOMEM; 744 return 0; 745 } 746 747 static void __net_exit ip6_flowlabel_proc_fini(struct net *net) 748 { 749 proc_net_remove(net, "ip6_flowlabel"); 750 } 751 #else 752 static inline int ip6_flowlabel_proc_init(struct net *net) 753 { 754 return 0; 755 } 756 static inline void ip6_flowlabel_proc_fini(struct net *net) 757 { 758 } 759 #endif 760 761 static void __net_exit ip6_flowlabel_net_exit(struct net *net) 762 { 763 ip6_fl_purge(net); 764 ip6_flowlabel_proc_fini(net); 765 } 766 767 static struct pernet_operations ip6_flowlabel_net_ops = { 768 .init = ip6_flowlabel_proc_init, 769 .exit = ip6_flowlabel_net_exit, 770 }; 771 772 int ip6_flowlabel_init(void) 773 { 774 return register_pernet_subsys(&ip6_flowlabel_net_ops); 775 } 776 777 void ip6_flowlabel_cleanup(void) 778 { 779 del_timer(&ip6_fl_gc_timer); 780 unregister_pernet_subsys(&ip6_flowlabel_net_ops); 781 } 782