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