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 = NULL; 327 int olen; 328 int addr_type; 329 int err; 330 331 olen = optlen - CMSG_ALIGN(sizeof(*freq)); 332 err = -EINVAL; 333 if (olen > 64 * 1024) 334 goto done; 335 336 err = -ENOMEM; 337 fl = kzalloc(sizeof(*fl), GFP_KERNEL); 338 if (fl == NULL) 339 goto done; 340 341 if (olen > 0) { 342 struct msghdr msg; 343 struct flowi flowi; 344 int junk; 345 346 err = -ENOMEM; 347 fl->opt = kmalloc(sizeof(*fl->opt) + olen, GFP_KERNEL); 348 if (fl->opt == NULL) 349 goto done; 350 351 memset(fl->opt, 0, sizeof(*fl->opt)); 352 fl->opt->tot_len = sizeof(*fl->opt) + olen; 353 err = -EFAULT; 354 if (copy_from_user(fl->opt+1, optval+CMSG_ALIGN(sizeof(*freq)), olen)) 355 goto done; 356 357 msg.msg_controllen = olen; 358 msg.msg_control = (void*)(fl->opt+1); 359 flowi.oif = 0; 360 361 err = datagram_send_ctl(net, &msg, &flowi, fl->opt, &junk, &junk); 362 if (err) 363 goto done; 364 err = -EINVAL; 365 if (fl->opt->opt_flen) 366 goto done; 367 if (fl->opt->opt_nflen == 0) { 368 kfree(fl->opt); 369 fl->opt = NULL; 370 } 371 } 372 373 fl->fl_net = hold_net(net); 374 fl->expires = jiffies; 375 err = fl6_renew(fl, freq->flr_linger, freq->flr_expires); 376 if (err) 377 goto done; 378 fl->share = freq->flr_share; 379 addr_type = ipv6_addr_type(&freq->flr_dst); 380 if ((addr_type&IPV6_ADDR_MAPPED) 381 || addr_type == IPV6_ADDR_ANY) { 382 err = -EINVAL; 383 goto done; 384 } 385 ipv6_addr_copy(&fl->dst, &freq->flr_dst); 386 atomic_set(&fl->users, 1); 387 switch (fl->share) { 388 case IPV6_FL_S_EXCL: 389 case IPV6_FL_S_ANY: 390 break; 391 case IPV6_FL_S_PROCESS: 392 fl->owner = current->pid; 393 break; 394 case IPV6_FL_S_USER: 395 fl->owner = current_euid(); 396 break; 397 default: 398 err = -EINVAL; 399 goto done; 400 } 401 return fl; 402 403 done: 404 fl_free(fl); 405 *err_p = err; 406 return NULL; 407 } 408 409 static int mem_check(struct sock *sk) 410 { 411 struct ipv6_pinfo *np = inet6_sk(sk); 412 struct ipv6_fl_socklist *sfl; 413 int room = FL_MAX_SIZE - atomic_read(&fl_size); 414 int count = 0; 415 416 if (room > FL_MAX_SIZE - FL_MAX_PER_SOCK) 417 return 0; 418 419 for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) 420 count++; 421 422 if (room <= 0 || 423 ((count >= FL_MAX_PER_SOCK || 424 (count > 0 && room < FL_MAX_SIZE/2) || room < FL_MAX_SIZE/4) 425 && !capable(CAP_NET_ADMIN))) 426 return -ENOBUFS; 427 428 return 0; 429 } 430 431 static int ipv6_hdr_cmp(struct ipv6_opt_hdr *h1, struct ipv6_opt_hdr *h2) 432 { 433 if (h1 == h2) 434 return 0; 435 if (h1 == NULL || h2 == NULL) 436 return 1; 437 if (h1->hdrlen != h2->hdrlen) 438 return 1; 439 return memcmp(h1+1, h2+1, ((h1->hdrlen+1)<<3) - sizeof(*h1)); 440 } 441 442 static int ipv6_opt_cmp(struct ipv6_txoptions *o1, struct ipv6_txoptions *o2) 443 { 444 if (o1 == o2) 445 return 0; 446 if (o1 == NULL || o2 == NULL) 447 return 1; 448 if (o1->opt_nflen != o2->opt_nflen) 449 return 1; 450 if (ipv6_hdr_cmp(o1->hopopt, o2->hopopt)) 451 return 1; 452 if (ipv6_hdr_cmp(o1->dst0opt, o2->dst0opt)) 453 return 1; 454 if (ipv6_hdr_cmp((struct ipv6_opt_hdr *)o1->srcrt, (struct ipv6_opt_hdr *)o2->srcrt)) 455 return 1; 456 return 0; 457 } 458 459 static inline void fl_link(struct ipv6_pinfo *np, struct ipv6_fl_socklist *sfl, 460 struct ip6_flowlabel *fl) 461 { 462 write_lock_bh(&ip6_sk_fl_lock); 463 sfl->fl = fl; 464 sfl->next = np->ipv6_fl_list; 465 np->ipv6_fl_list = sfl; 466 write_unlock_bh(&ip6_sk_fl_lock); 467 } 468 469 int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen) 470 { 471 int uninitialized_var(err); 472 struct net *net = sock_net(sk); 473 struct ipv6_pinfo *np = inet6_sk(sk); 474 struct in6_flowlabel_req freq; 475 struct ipv6_fl_socklist *sfl1=NULL; 476 struct ipv6_fl_socklist *sfl, **sflp; 477 struct ip6_flowlabel *fl, *fl1 = NULL; 478 479 480 if (optlen < sizeof(freq)) 481 return -EINVAL; 482 483 if (copy_from_user(&freq, optval, sizeof(freq))) 484 return -EFAULT; 485 486 switch (freq.flr_action) { 487 case IPV6_FL_A_PUT: 488 write_lock_bh(&ip6_sk_fl_lock); 489 for (sflp = &np->ipv6_fl_list; (sfl=*sflp)!=NULL; sflp = &sfl->next) { 490 if (sfl->fl->label == freq.flr_label) { 491 if (freq.flr_label == (np->flow_label&IPV6_FLOWLABEL_MASK)) 492 np->flow_label &= ~IPV6_FLOWLABEL_MASK; 493 *sflp = sfl->next; 494 write_unlock_bh(&ip6_sk_fl_lock); 495 fl_release(sfl->fl); 496 kfree(sfl); 497 return 0; 498 } 499 } 500 write_unlock_bh(&ip6_sk_fl_lock); 501 return -ESRCH; 502 503 case IPV6_FL_A_RENEW: 504 read_lock_bh(&ip6_sk_fl_lock); 505 for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) { 506 if (sfl->fl->label == freq.flr_label) { 507 err = fl6_renew(sfl->fl, freq.flr_linger, freq.flr_expires); 508 read_unlock_bh(&ip6_sk_fl_lock); 509 return err; 510 } 511 } 512 read_unlock_bh(&ip6_sk_fl_lock); 513 514 if (freq.flr_share == IPV6_FL_S_NONE && capable(CAP_NET_ADMIN)) { 515 fl = fl_lookup(net, freq.flr_label); 516 if (fl) { 517 err = fl6_renew(fl, freq.flr_linger, freq.flr_expires); 518 fl_release(fl); 519 return err; 520 } 521 } 522 return -ESRCH; 523 524 case IPV6_FL_A_GET: 525 if (freq.flr_label & ~IPV6_FLOWLABEL_MASK) 526 return -EINVAL; 527 528 fl = fl_create(net, &freq, optval, optlen, &err); 529 if (fl == NULL) 530 return err; 531 sfl1 = kmalloc(sizeof(*sfl1), GFP_KERNEL); 532 533 if (freq.flr_label) { 534 err = -EEXIST; 535 read_lock_bh(&ip6_sk_fl_lock); 536 for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) { 537 if (sfl->fl->label == freq.flr_label) { 538 if (freq.flr_flags&IPV6_FL_F_EXCL) { 539 read_unlock_bh(&ip6_sk_fl_lock); 540 goto done; 541 } 542 fl1 = sfl->fl; 543 atomic_inc(&fl1->users); 544 break; 545 } 546 } 547 read_unlock_bh(&ip6_sk_fl_lock); 548 549 if (fl1 == NULL) 550 fl1 = fl_lookup(net, freq.flr_label); 551 if (fl1) { 552 recheck: 553 err = -EEXIST; 554 if (freq.flr_flags&IPV6_FL_F_EXCL) 555 goto release; 556 err = -EPERM; 557 if (fl1->share == IPV6_FL_S_EXCL || 558 fl1->share != fl->share || 559 fl1->owner != fl->owner) 560 goto release; 561 562 err = -EINVAL; 563 if (!ipv6_addr_equal(&fl1->dst, &fl->dst) || 564 ipv6_opt_cmp(fl1->opt, fl->opt)) 565 goto release; 566 567 err = -ENOMEM; 568 if (sfl1 == NULL) 569 goto release; 570 if (fl->linger > fl1->linger) 571 fl1->linger = fl->linger; 572 if ((long)(fl->expires - fl1->expires) > 0) 573 fl1->expires = fl->expires; 574 fl_link(np, sfl1, fl1); 575 fl_free(fl); 576 return 0; 577 578 release: 579 fl_release(fl1); 580 goto done; 581 } 582 } 583 err = -ENOENT; 584 if (!(freq.flr_flags&IPV6_FL_F_CREATE)) 585 goto done; 586 587 err = -ENOMEM; 588 if (sfl1 == NULL || (err = mem_check(sk)) != 0) 589 goto done; 590 591 fl1 = fl_intern(net, fl, freq.flr_label); 592 if (fl1 != NULL) 593 goto recheck; 594 595 if (!freq.flr_label) { 596 if (copy_to_user(&((struct in6_flowlabel_req __user *) optval)->flr_label, 597 &fl->label, sizeof(fl->label))) { 598 /* Intentionally ignore fault. */ 599 } 600 } 601 602 fl_link(np, sfl1, fl); 603 return 0; 604 605 default: 606 return -EINVAL; 607 } 608 609 done: 610 fl_free(fl); 611 kfree(sfl1); 612 return err; 613 } 614 615 #ifdef CONFIG_PROC_FS 616 617 struct ip6fl_iter_state { 618 struct seq_net_private p; 619 int bucket; 620 }; 621 622 #define ip6fl_seq_private(seq) ((struct ip6fl_iter_state *)(seq)->private) 623 624 static struct ip6_flowlabel *ip6fl_get_first(struct seq_file *seq) 625 { 626 struct ip6_flowlabel *fl = NULL; 627 struct ip6fl_iter_state *state = ip6fl_seq_private(seq); 628 struct net *net = seq_file_net(seq); 629 630 for (state->bucket = 0; state->bucket <= FL_HASH_MASK; ++state->bucket) { 631 fl = fl_ht[state->bucket]; 632 633 while (fl && fl->fl_net != net) 634 fl = fl->next; 635 if (fl) 636 break; 637 } 638 return fl; 639 } 640 641 static struct ip6_flowlabel *ip6fl_get_next(struct seq_file *seq, struct ip6_flowlabel *fl) 642 { 643 struct ip6fl_iter_state *state = ip6fl_seq_private(seq); 644 struct net *net = seq_file_net(seq); 645 646 fl = fl->next; 647 try_again: 648 while (fl && fl->fl_net != net) 649 fl = fl->next; 650 651 while (!fl) { 652 if (++state->bucket <= FL_HASH_MASK) { 653 fl = fl_ht[state->bucket]; 654 goto try_again; 655 } else 656 break; 657 } 658 return fl; 659 } 660 661 static struct ip6_flowlabel *ip6fl_get_idx(struct seq_file *seq, loff_t pos) 662 { 663 struct ip6_flowlabel *fl = ip6fl_get_first(seq); 664 if (fl) 665 while (pos && (fl = ip6fl_get_next(seq, fl)) != NULL) 666 --pos; 667 return pos ? NULL : fl; 668 } 669 670 static void *ip6fl_seq_start(struct seq_file *seq, loff_t *pos) 671 __acquires(ip6_fl_lock) 672 { 673 read_lock_bh(&ip6_fl_lock); 674 return *pos ? ip6fl_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 675 } 676 677 static void *ip6fl_seq_next(struct seq_file *seq, void *v, loff_t *pos) 678 { 679 struct ip6_flowlabel *fl; 680 681 if (v == SEQ_START_TOKEN) 682 fl = ip6fl_get_first(seq); 683 else 684 fl = ip6fl_get_next(seq, v); 685 ++*pos; 686 return fl; 687 } 688 689 static void ip6fl_seq_stop(struct seq_file *seq, void *v) 690 __releases(ip6_fl_lock) 691 { 692 read_unlock_bh(&ip6_fl_lock); 693 } 694 695 static int ip6fl_seq_show(struct seq_file *seq, void *v) 696 { 697 if (v == SEQ_START_TOKEN) 698 seq_printf(seq, "%-5s %-1s %-6s %-6s %-6s %-8s %-32s %s\n", 699 "Label", "S", "Owner", "Users", "Linger", "Expires", "Dst", "Opt"); 700 else { 701 struct ip6_flowlabel *fl = v; 702 seq_printf(seq, 703 "%05X %-1d %-6d %-6d %-6ld %-8ld %pi6 %-4d\n", 704 (unsigned)ntohl(fl->label), 705 fl->share, 706 (unsigned)fl->owner, 707 atomic_read(&fl->users), 708 fl->linger/HZ, 709 (long)(fl->expires - jiffies)/HZ, 710 &fl->dst, 711 fl->opt ? fl->opt->opt_nflen : 0); 712 } 713 return 0; 714 } 715 716 static const struct seq_operations ip6fl_seq_ops = { 717 .start = ip6fl_seq_start, 718 .next = ip6fl_seq_next, 719 .stop = ip6fl_seq_stop, 720 .show = ip6fl_seq_show, 721 }; 722 723 static int ip6fl_seq_open(struct inode *inode, struct file *file) 724 { 725 return seq_open_net(inode, file, &ip6fl_seq_ops, 726 sizeof(struct ip6fl_iter_state)); 727 } 728 729 static const struct file_operations ip6fl_seq_fops = { 730 .owner = THIS_MODULE, 731 .open = ip6fl_seq_open, 732 .read = seq_read, 733 .llseek = seq_lseek, 734 .release = seq_release_net, 735 }; 736 737 static int ip6_flowlabel_proc_init(struct net *net) 738 { 739 if (!proc_net_fops_create(net, "ip6_flowlabel", 740 S_IRUGO, &ip6fl_seq_fops)) 741 return -ENOMEM; 742 return 0; 743 } 744 745 static void ip6_flowlabel_proc_fini(struct net *net) 746 { 747 proc_net_remove(net, "ip6_flowlabel"); 748 } 749 #else 750 static inline int ip6_flowlabel_proc_init(struct net *net) 751 { 752 return 0; 753 } 754 static inline void ip6_flowlabel_proc_fini(struct net *net) 755 { 756 return ; 757 } 758 #endif 759 760 static inline void ip6_flowlabel_net_exit(struct net *net) 761 { 762 ip6_fl_purge(net); 763 ip6_flowlabel_proc_fini(net); 764 } 765 766 static struct pernet_operations ip6_flowlabel_net_ops = { 767 .init = ip6_flowlabel_proc_init, 768 .exit = ip6_flowlabel_net_exit, 769 }; 770 771 int ip6_flowlabel_init(void) 772 { 773 return register_pernet_subsys(&ip6_flowlabel_net_ops); 774 } 775 776 void ip6_flowlabel_cleanup(void) 777 { 778 del_timer(&ip6_fl_gc_timer); 779 unregister_pernet_subsys(&ip6_flowlabel_net_ops); 780 } 781