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 && 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 (fl->fl_net == net && atomic_read(&fl->users) == 0) { 167 *flp = fl->next; 168 fl_free(fl); 169 atomic_dec(&fl_size); 170 continue; 171 } 172 flp = &fl->next; 173 } 174 } 175 write_unlock(&ip6_fl_lock); 176 } 177 178 static struct ip6_flowlabel *fl_intern(struct net *net, 179 struct ip6_flowlabel *fl, __be32 label) 180 { 181 struct ip6_flowlabel *lfl; 182 183 fl->label = label & IPV6_FLOWLABEL_MASK; 184 185 write_lock_bh(&ip6_fl_lock); 186 if (label == 0) { 187 for (;;) { 188 fl->label = htonl(net_random())&IPV6_FLOWLABEL_MASK; 189 if (fl->label) { 190 lfl = __fl_lookup(net, fl->label); 191 if (lfl == NULL) 192 break; 193 } 194 } 195 } else { 196 /* 197 * we dropper the ip6_fl_lock, so this entry could reappear 198 * and we need to recheck with it. 199 * 200 * OTOH no need to search the active socket first, like it is 201 * done in ipv6_flowlabel_opt - sock is locked, so new entry 202 * with the same label can only appear on another sock 203 */ 204 lfl = __fl_lookup(net, fl->label); 205 if (lfl != NULL) { 206 atomic_inc(&lfl->users); 207 write_unlock_bh(&ip6_fl_lock); 208 return lfl; 209 } 210 } 211 212 fl->lastuse = jiffies; 213 fl->next = fl_ht[FL_HASH(fl->label)]; 214 fl_ht[FL_HASH(fl->label)] = fl; 215 atomic_inc(&fl_size); 216 write_unlock_bh(&ip6_fl_lock); 217 return NULL; 218 } 219 220 221 222 /* Socket flowlabel lists */ 223 224 struct ip6_flowlabel * fl6_sock_lookup(struct sock *sk, __be32 label) 225 { 226 struct ipv6_fl_socklist *sfl; 227 struct ipv6_pinfo *np = inet6_sk(sk); 228 229 label &= IPV6_FLOWLABEL_MASK; 230 231 read_lock_bh(&ip6_sk_fl_lock); 232 for (sfl=np->ipv6_fl_list; sfl; sfl = sfl->next) { 233 struct ip6_flowlabel *fl = sfl->fl; 234 if (fl->label == label) { 235 fl->lastuse = jiffies; 236 atomic_inc(&fl->users); 237 read_unlock_bh(&ip6_sk_fl_lock); 238 return fl; 239 } 240 } 241 read_unlock_bh(&ip6_sk_fl_lock); 242 return NULL; 243 } 244 245 EXPORT_SYMBOL_GPL(fl6_sock_lookup); 246 247 void fl6_free_socklist(struct sock *sk) 248 { 249 struct ipv6_pinfo *np = inet6_sk(sk); 250 struct ipv6_fl_socklist *sfl; 251 252 while ((sfl = np->ipv6_fl_list) != NULL) { 253 np->ipv6_fl_list = sfl->next; 254 fl_release(sfl->fl); 255 kfree(sfl); 256 } 257 } 258 259 /* Service routines */ 260 261 262 /* 263 It is the only difficult place. flowlabel enforces equal headers 264 before and including routing header, however user may supply options 265 following rthdr. 266 */ 267 268 struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space, 269 struct ip6_flowlabel * fl, 270 struct ipv6_txoptions * fopt) 271 { 272 struct ipv6_txoptions * fl_opt = fl->opt; 273 274 if (fopt == NULL || fopt->opt_flen == 0) 275 return fl_opt; 276 277 if (fl_opt != NULL) { 278 opt_space->hopopt = fl_opt->hopopt; 279 opt_space->dst0opt = fl_opt->dst0opt; 280 opt_space->srcrt = fl_opt->srcrt; 281 opt_space->opt_nflen = fl_opt->opt_nflen; 282 } else { 283 if (fopt->opt_nflen == 0) 284 return fopt; 285 opt_space->hopopt = NULL; 286 opt_space->dst0opt = NULL; 287 opt_space->srcrt = NULL; 288 opt_space->opt_nflen = 0; 289 } 290 opt_space->dst1opt = fopt->dst1opt; 291 opt_space->opt_flen = fopt->opt_flen; 292 return opt_space; 293 } 294 295 static unsigned long check_linger(unsigned long ttl) 296 { 297 if (ttl < FL_MIN_LINGER) 298 return FL_MIN_LINGER*HZ; 299 if (ttl > FL_MAX_LINGER && !capable(CAP_NET_ADMIN)) 300 return 0; 301 return ttl*HZ; 302 } 303 304 static int fl6_renew(struct ip6_flowlabel *fl, unsigned long linger, unsigned long expires) 305 { 306 linger = check_linger(linger); 307 if (!linger) 308 return -EPERM; 309 expires = check_linger(expires); 310 if (!expires) 311 return -EPERM; 312 fl->lastuse = jiffies; 313 if (time_before(fl->linger, linger)) 314 fl->linger = linger; 315 if (time_before(expires, fl->linger)) 316 expires = fl->linger; 317 if (time_before(fl->expires, fl->lastuse + expires)) 318 fl->expires = fl->lastuse + expires; 319 return 0; 320 } 321 322 static struct ip6_flowlabel * 323 fl_create(struct net *net, struct in6_flowlabel_req *freq, char __user *optval, 324 int optlen, int *err_p) 325 { 326 struct ip6_flowlabel *fl; 327 int olen; 328 int addr_type; 329 int err; 330 331 err = -ENOMEM; 332 fl = kzalloc(sizeof(*fl), GFP_KERNEL); 333 if (fl == NULL) 334 goto done; 335 336 olen = optlen - CMSG_ALIGN(sizeof(*freq)); 337 if (olen > 0) { 338 struct msghdr msg; 339 struct flowi flowi; 340 int junk; 341 342 err = -ENOMEM; 343 fl->opt = kmalloc(sizeof(*fl->opt) + olen, GFP_KERNEL); 344 if (fl->opt == NULL) 345 goto done; 346 347 memset(fl->opt, 0, sizeof(*fl->opt)); 348 fl->opt->tot_len = sizeof(*fl->opt) + olen; 349 err = -EFAULT; 350 if (copy_from_user(fl->opt+1, optval+CMSG_ALIGN(sizeof(*freq)), olen)) 351 goto done; 352 353 msg.msg_controllen = olen; 354 msg.msg_control = (void*)(fl->opt+1); 355 flowi.oif = 0; 356 357 err = datagram_send_ctl(net, &msg, &flowi, fl->opt, &junk, &junk); 358 if (err) 359 goto done; 360 err = -EINVAL; 361 if (fl->opt->opt_flen) 362 goto done; 363 if (fl->opt->opt_nflen == 0) { 364 kfree(fl->opt); 365 fl->opt = NULL; 366 } 367 } 368 369 fl->fl_net = hold_net(net); 370 fl->expires = jiffies; 371 err = fl6_renew(fl, freq->flr_linger, freq->flr_expires); 372 if (err) 373 goto done; 374 fl->share = freq->flr_share; 375 addr_type = ipv6_addr_type(&freq->flr_dst); 376 if ((addr_type&IPV6_ADDR_MAPPED) 377 || addr_type == IPV6_ADDR_ANY) { 378 err = -EINVAL; 379 goto done; 380 } 381 ipv6_addr_copy(&fl->dst, &freq->flr_dst); 382 atomic_set(&fl->users, 1); 383 switch (fl->share) { 384 case IPV6_FL_S_EXCL: 385 case IPV6_FL_S_ANY: 386 break; 387 case IPV6_FL_S_PROCESS: 388 fl->owner = current->pid; 389 break; 390 case IPV6_FL_S_USER: 391 fl->owner = current->euid; 392 break; 393 default: 394 err = -EINVAL; 395 goto done; 396 } 397 return fl; 398 399 done: 400 fl_free(fl); 401 *err_p = err; 402 return NULL; 403 } 404 405 static int mem_check(struct sock *sk) 406 { 407 struct ipv6_pinfo *np = inet6_sk(sk); 408 struct ipv6_fl_socklist *sfl; 409 int room = FL_MAX_SIZE - atomic_read(&fl_size); 410 int count = 0; 411 412 if (room > FL_MAX_SIZE - FL_MAX_PER_SOCK) 413 return 0; 414 415 for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) 416 count++; 417 418 if (room <= 0 || 419 ((count >= FL_MAX_PER_SOCK || 420 (count > 0 && room < FL_MAX_SIZE/2) || room < FL_MAX_SIZE/4) 421 && !capable(CAP_NET_ADMIN))) 422 return -ENOBUFS; 423 424 return 0; 425 } 426 427 static int ipv6_hdr_cmp(struct ipv6_opt_hdr *h1, struct ipv6_opt_hdr *h2) 428 { 429 if (h1 == h2) 430 return 0; 431 if (h1 == NULL || h2 == NULL) 432 return 1; 433 if (h1->hdrlen != h2->hdrlen) 434 return 1; 435 return memcmp(h1+1, h2+1, ((h1->hdrlen+1)<<3) - sizeof(*h1)); 436 } 437 438 static int ipv6_opt_cmp(struct ipv6_txoptions *o1, struct ipv6_txoptions *o2) 439 { 440 if (o1 == o2) 441 return 0; 442 if (o1 == NULL || o2 == NULL) 443 return 1; 444 if (o1->opt_nflen != o2->opt_nflen) 445 return 1; 446 if (ipv6_hdr_cmp(o1->hopopt, o2->hopopt)) 447 return 1; 448 if (ipv6_hdr_cmp(o1->dst0opt, o2->dst0opt)) 449 return 1; 450 if (ipv6_hdr_cmp((struct ipv6_opt_hdr *)o1->srcrt, (struct ipv6_opt_hdr *)o2->srcrt)) 451 return 1; 452 return 0; 453 } 454 455 static inline void fl_link(struct ipv6_pinfo *np, struct ipv6_fl_socklist *sfl, 456 struct ip6_flowlabel *fl) 457 { 458 write_lock_bh(&ip6_sk_fl_lock); 459 sfl->fl = fl; 460 sfl->next = np->ipv6_fl_list; 461 np->ipv6_fl_list = sfl; 462 write_unlock_bh(&ip6_sk_fl_lock); 463 } 464 465 int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen) 466 { 467 int err; 468 struct net *net = sock_net(sk); 469 struct ipv6_pinfo *np = inet6_sk(sk); 470 struct in6_flowlabel_req freq; 471 struct ipv6_fl_socklist *sfl1=NULL; 472 struct ipv6_fl_socklist *sfl, **sflp; 473 struct ip6_flowlabel *fl, *fl1 = NULL; 474 475 476 if (optlen < sizeof(freq)) 477 return -EINVAL; 478 479 if (copy_from_user(&freq, optval, sizeof(freq))) 480 return -EFAULT; 481 482 switch (freq.flr_action) { 483 case IPV6_FL_A_PUT: 484 write_lock_bh(&ip6_sk_fl_lock); 485 for (sflp = &np->ipv6_fl_list; (sfl=*sflp)!=NULL; sflp = &sfl->next) { 486 if (sfl->fl->label == freq.flr_label) { 487 if (freq.flr_label == (np->flow_label&IPV6_FLOWLABEL_MASK)) 488 np->flow_label &= ~IPV6_FLOWLABEL_MASK; 489 *sflp = sfl->next; 490 write_unlock_bh(&ip6_sk_fl_lock); 491 fl_release(sfl->fl); 492 kfree(sfl); 493 return 0; 494 } 495 } 496 write_unlock_bh(&ip6_sk_fl_lock); 497 return -ESRCH; 498 499 case IPV6_FL_A_RENEW: 500 read_lock_bh(&ip6_sk_fl_lock); 501 for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) { 502 if (sfl->fl->label == freq.flr_label) { 503 err = fl6_renew(sfl->fl, freq.flr_linger, freq.flr_expires); 504 read_unlock_bh(&ip6_sk_fl_lock); 505 return err; 506 } 507 } 508 read_unlock_bh(&ip6_sk_fl_lock); 509 510 if (freq.flr_share == IPV6_FL_S_NONE && capable(CAP_NET_ADMIN)) { 511 fl = fl_lookup(net, freq.flr_label); 512 if (fl) { 513 err = fl6_renew(fl, freq.flr_linger, freq.flr_expires); 514 fl_release(fl); 515 return err; 516 } 517 } 518 return -ESRCH; 519 520 case IPV6_FL_A_GET: 521 if (freq.flr_label & ~IPV6_FLOWLABEL_MASK) 522 return -EINVAL; 523 524 fl = fl_create(net, &freq, optval, optlen, &err); 525 if (fl == NULL) 526 return err; 527 sfl1 = kmalloc(sizeof(*sfl1), GFP_KERNEL); 528 529 if (freq.flr_label) { 530 err = -EEXIST; 531 read_lock_bh(&ip6_sk_fl_lock); 532 for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) { 533 if (sfl->fl->label == freq.flr_label) { 534 if (freq.flr_flags&IPV6_FL_F_EXCL) { 535 read_unlock_bh(&ip6_sk_fl_lock); 536 goto done; 537 } 538 fl1 = sfl->fl; 539 atomic_inc(&fl1->users); 540 break; 541 } 542 } 543 read_unlock_bh(&ip6_sk_fl_lock); 544 545 if (fl1 == NULL) 546 fl1 = fl_lookup(net, freq.flr_label); 547 if (fl1) { 548 recheck: 549 err = -EEXIST; 550 if (freq.flr_flags&IPV6_FL_F_EXCL) 551 goto release; 552 err = -EPERM; 553 if (fl1->share == IPV6_FL_S_EXCL || 554 fl1->share != fl->share || 555 fl1->owner != fl->owner) 556 goto release; 557 558 err = -EINVAL; 559 if (!ipv6_addr_equal(&fl1->dst, &fl->dst) || 560 ipv6_opt_cmp(fl1->opt, fl->opt)) 561 goto release; 562 563 err = -ENOMEM; 564 if (sfl1 == NULL) 565 goto release; 566 if (fl->linger > fl1->linger) 567 fl1->linger = fl->linger; 568 if ((long)(fl->expires - fl1->expires) > 0) 569 fl1->expires = fl->expires; 570 fl_link(np, sfl1, fl1); 571 fl_free(fl); 572 return 0; 573 574 release: 575 fl_release(fl1); 576 goto done; 577 } 578 } 579 err = -ENOENT; 580 if (!(freq.flr_flags&IPV6_FL_F_CREATE)) 581 goto done; 582 583 err = -ENOMEM; 584 if (sfl1 == NULL || (err = mem_check(sk)) != 0) 585 goto done; 586 587 fl1 = fl_intern(net, fl, freq.flr_label); 588 if (fl1 != NULL) 589 goto recheck; 590 591 if (!freq.flr_label) { 592 if (copy_to_user(&((struct in6_flowlabel_req __user *) optval)->flr_label, 593 &fl->label, sizeof(fl->label))) { 594 /* Intentionally ignore fault. */ 595 } 596 } 597 598 fl_link(np, sfl1, fl); 599 return 0; 600 601 default: 602 return -EINVAL; 603 } 604 605 done: 606 fl_free(fl); 607 kfree(sfl1); 608 return err; 609 } 610 611 #ifdef CONFIG_PROC_FS 612 613 struct ip6fl_iter_state { 614 struct seq_net_private p; 615 int bucket; 616 }; 617 618 #define ip6fl_seq_private(seq) ((struct ip6fl_iter_state *)(seq)->private) 619 620 static struct ip6_flowlabel *ip6fl_get_first(struct seq_file *seq) 621 { 622 struct ip6_flowlabel *fl = NULL; 623 struct ip6fl_iter_state *state = ip6fl_seq_private(seq); 624 struct net *net = seq_file_net(seq); 625 626 for (state->bucket = 0; state->bucket <= FL_HASH_MASK; ++state->bucket) { 627 fl = fl_ht[state->bucket]; 628 629 while (fl && fl->fl_net != net) 630 fl = fl->next; 631 if (fl) 632 break; 633 } 634 return fl; 635 } 636 637 static struct ip6_flowlabel *ip6fl_get_next(struct seq_file *seq, struct ip6_flowlabel *fl) 638 { 639 struct ip6fl_iter_state *state = ip6fl_seq_private(seq); 640 struct net *net = seq_file_net(seq); 641 642 fl = fl->next; 643 try_again: 644 while (fl && fl->fl_net != net) 645 fl = fl->next; 646 647 while (!fl) { 648 if (++state->bucket <= FL_HASH_MASK) { 649 fl = fl_ht[state->bucket]; 650 goto try_again; 651 } else 652 break; 653 } 654 return fl; 655 } 656 657 static struct ip6_flowlabel *ip6fl_get_idx(struct seq_file *seq, loff_t pos) 658 { 659 struct ip6_flowlabel *fl = ip6fl_get_first(seq); 660 if (fl) 661 while (pos && (fl = ip6fl_get_next(seq, fl)) != NULL) 662 --pos; 663 return pos ? NULL : fl; 664 } 665 666 static void *ip6fl_seq_start(struct seq_file *seq, loff_t *pos) 667 __acquires(ip6_fl_lock) 668 { 669 read_lock_bh(&ip6_fl_lock); 670 return *pos ? ip6fl_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 671 } 672 673 static void *ip6fl_seq_next(struct seq_file *seq, void *v, loff_t *pos) 674 { 675 struct ip6_flowlabel *fl; 676 677 if (v == SEQ_START_TOKEN) 678 fl = ip6fl_get_first(seq); 679 else 680 fl = ip6fl_get_next(seq, v); 681 ++*pos; 682 return fl; 683 } 684 685 static void ip6fl_seq_stop(struct seq_file *seq, void *v) 686 __releases(ip6_fl_lock) 687 { 688 read_unlock_bh(&ip6_fl_lock); 689 } 690 691 static int ip6fl_seq_show(struct seq_file *seq, void *v) 692 { 693 if (v == SEQ_START_TOKEN) 694 seq_printf(seq, "%-5s %-1s %-6s %-6s %-6s %-8s %-32s %s\n", 695 "Label", "S", "Owner", "Users", "Linger", "Expires", "Dst", "Opt"); 696 else { 697 struct ip6_flowlabel *fl = v; 698 seq_printf(seq, 699 "%05X %-1d %-6d %-6d %-6ld %-8ld " NIP6_SEQFMT " %-4d\n", 700 (unsigned)ntohl(fl->label), 701 fl->share, 702 (unsigned)fl->owner, 703 atomic_read(&fl->users), 704 fl->linger/HZ, 705 (long)(fl->expires - jiffies)/HZ, 706 NIP6(fl->dst), 707 fl->opt ? fl->opt->opt_nflen : 0); 708 } 709 return 0; 710 } 711 712 static const struct seq_operations ip6fl_seq_ops = { 713 .start = ip6fl_seq_start, 714 .next = ip6fl_seq_next, 715 .stop = ip6fl_seq_stop, 716 .show = ip6fl_seq_show, 717 }; 718 719 static int ip6fl_seq_open(struct inode *inode, struct file *file) 720 { 721 return seq_open_net(inode, file, &ip6fl_seq_ops, 722 sizeof(struct ip6fl_iter_state)); 723 } 724 725 static const struct file_operations ip6fl_seq_fops = { 726 .owner = THIS_MODULE, 727 .open = ip6fl_seq_open, 728 .read = seq_read, 729 .llseek = seq_lseek, 730 .release = seq_release_net, 731 }; 732 733 static int ip6_flowlabel_proc_init(struct net *net) 734 { 735 if (!proc_net_fops_create(net, "ip6_flowlabel", 736 S_IRUGO, &ip6fl_seq_fops)) 737 return -ENOMEM; 738 return 0; 739 } 740 741 static void ip6_flowlabel_proc_fini(struct net *net) 742 { 743 proc_net_remove(net, "ip6_flowlabel"); 744 } 745 #else 746 static inline int ip6_flowlabel_proc_init(struct net *net) 747 { 748 return 0; 749 } 750 static inline void ip6_flowlabel_proc_fini(struct net *net) 751 { 752 return ; 753 } 754 #endif 755 756 static inline void ip6_flowlabel_net_exit(struct net *net) 757 { 758 ip6_fl_purge(net); 759 ip6_flowlabel_proc_fini(net); 760 } 761 762 static struct pernet_operations ip6_flowlabel_net_ops = { 763 .init = ip6_flowlabel_proc_init, 764 .exit = ip6_flowlabel_net_exit, 765 }; 766 767 int ip6_flowlabel_init(void) 768 { 769 return register_pernet_subsys(&ip6_flowlabel_net_ops); 770 } 771 772 void ip6_flowlabel_cleanup(void) 773 { 774 del_timer(&ip6_fl_gc_timer); 775 unregister_pernet_subsys(&ip6_flowlabel_net_ops); 776 } 777