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 #include <linux/export.h> 25 #include <linux/pid_namespace.h> 26 27 #include <net/net_namespace.h> 28 #include <net/sock.h> 29 30 #include <net/ipv6.h> 31 #include <net/ndisc.h> 32 #include <net/protocol.h> 33 #include <net/ip6_route.h> 34 #include <net/addrconf.h> 35 #include <net/rawv6.h> 36 #include <net/icmp.h> 37 #include <net/transp_v6.h> 38 39 #include <asm/uaccess.h> 40 41 #define FL_MIN_LINGER 6 /* Minimal linger. It is set to 6sec specified 42 in old IPv6 RFC. Well, it was reasonable value. 43 */ 44 #define FL_MAX_LINGER 60 /* Maximal linger timeout */ 45 46 /* FL hash table */ 47 48 #define FL_MAX_PER_SOCK 32 49 #define FL_MAX_SIZE 4096 50 #define FL_HASH_MASK 255 51 #define FL_HASH(l) (ntohl(l)&FL_HASH_MASK) 52 53 static atomic_t fl_size = ATOMIC_INIT(0); 54 static struct ip6_flowlabel *fl_ht[FL_HASH_MASK+1]; 55 56 static void ip6_fl_gc(unsigned long dummy); 57 static DEFINE_TIMER(ip6_fl_gc_timer, ip6_fl_gc, 0, 0); 58 59 /* FL hash table lock: it protects only of GC */ 60 61 static DEFINE_RWLOCK(ip6_fl_lock); 62 63 /* Big socket sock */ 64 65 static DEFINE_RWLOCK(ip6_sk_fl_lock); 66 67 68 static inline struct ip6_flowlabel *__fl_lookup(struct net *net, __be32 label) 69 { 70 struct ip6_flowlabel *fl; 71 72 for (fl=fl_ht[FL_HASH(label)]; fl; fl = fl->next) { 73 if (fl->label == label && net_eq(fl->fl_net, net)) 74 return fl; 75 } 76 return NULL; 77 } 78 79 static struct ip6_flowlabel *fl_lookup(struct net *net, __be32 label) 80 { 81 struct ip6_flowlabel *fl; 82 83 read_lock_bh(&ip6_fl_lock); 84 fl = __fl_lookup(net, label); 85 if (fl) 86 atomic_inc(&fl->users); 87 read_unlock_bh(&ip6_fl_lock); 88 return fl; 89 } 90 91 92 static void fl_free(struct ip6_flowlabel *fl) 93 { 94 if (fl) { 95 if (fl->share == IPV6_FL_S_PROCESS) 96 put_pid(fl->owner.pid); 97 release_net(fl->fl_net); 98 kfree(fl->opt); 99 } 100 kfree(fl); 101 } 102 103 static void fl_release(struct ip6_flowlabel *fl) 104 { 105 write_lock_bh(&ip6_fl_lock); 106 107 fl->lastuse = jiffies; 108 if (atomic_dec_and_test(&fl->users)) { 109 unsigned long ttd = fl->lastuse + fl->linger; 110 if (time_after(ttd, fl->expires)) 111 fl->expires = ttd; 112 ttd = fl->expires; 113 if (fl->opt && fl->share == IPV6_FL_S_EXCL) { 114 struct ipv6_txoptions *opt = fl->opt; 115 fl->opt = NULL; 116 kfree(opt); 117 } 118 if (!timer_pending(&ip6_fl_gc_timer) || 119 time_after(ip6_fl_gc_timer.expires, ttd)) 120 mod_timer(&ip6_fl_gc_timer, ttd); 121 } 122 write_unlock_bh(&ip6_fl_lock); 123 } 124 125 static void ip6_fl_gc(unsigned long dummy) 126 { 127 int i; 128 unsigned long now = jiffies; 129 unsigned long sched = 0; 130 131 write_lock(&ip6_fl_lock); 132 133 for (i=0; i<=FL_HASH_MASK; i++) { 134 struct ip6_flowlabel *fl, **flp; 135 flp = &fl_ht[i]; 136 while ((fl=*flp) != NULL) { 137 if (atomic_read(&fl->users) == 0) { 138 unsigned long ttd = fl->lastuse + fl->linger; 139 if (time_after(ttd, fl->expires)) 140 fl->expires = ttd; 141 ttd = fl->expires; 142 if (time_after_eq(now, ttd)) { 143 *flp = fl->next; 144 fl_free(fl); 145 atomic_dec(&fl_size); 146 continue; 147 } 148 if (!sched || time_before(ttd, sched)) 149 sched = ttd; 150 } 151 flp = &fl->next; 152 } 153 } 154 if (!sched && atomic_read(&fl_size)) 155 sched = now + FL_MAX_LINGER; 156 if (sched) { 157 mod_timer(&ip6_fl_gc_timer, sched); 158 } 159 write_unlock(&ip6_fl_lock); 160 } 161 162 static void __net_exit ip6_fl_purge(struct net *net) 163 { 164 int i; 165 166 write_lock(&ip6_fl_lock); 167 for (i = 0; i <= FL_HASH_MASK; i++) { 168 struct ip6_flowlabel *fl, **flp; 169 flp = &fl_ht[i]; 170 while ((fl = *flp) != NULL) { 171 if (net_eq(fl->fl_net, net) && 172 atomic_read(&fl->users) == 0) { 173 *flp = fl->next; 174 fl_free(fl); 175 atomic_dec(&fl_size); 176 continue; 177 } 178 flp = &fl->next; 179 } 180 } 181 write_unlock(&ip6_fl_lock); 182 } 183 184 static struct ip6_flowlabel *fl_intern(struct net *net, 185 struct ip6_flowlabel *fl, __be32 label) 186 { 187 struct ip6_flowlabel *lfl; 188 189 fl->label = label & IPV6_FLOWLABEL_MASK; 190 191 write_lock_bh(&ip6_fl_lock); 192 if (label == 0) { 193 for (;;) { 194 fl->label = htonl(net_random())&IPV6_FLOWLABEL_MASK; 195 if (fl->label) { 196 lfl = __fl_lookup(net, fl->label); 197 if (lfl == NULL) 198 break; 199 } 200 } 201 } else { 202 /* 203 * we dropper the ip6_fl_lock, so this entry could reappear 204 * and we need to recheck with it. 205 * 206 * OTOH no need to search the active socket first, like it is 207 * done in ipv6_flowlabel_opt - sock is locked, so new entry 208 * with the same label can only appear on another sock 209 */ 210 lfl = __fl_lookup(net, fl->label); 211 if (lfl != NULL) { 212 atomic_inc(&lfl->users); 213 write_unlock_bh(&ip6_fl_lock); 214 return lfl; 215 } 216 } 217 218 fl->lastuse = jiffies; 219 fl->next = fl_ht[FL_HASH(fl->label)]; 220 fl_ht[FL_HASH(fl->label)] = fl; 221 atomic_inc(&fl_size); 222 write_unlock_bh(&ip6_fl_lock); 223 return NULL; 224 } 225 226 227 228 /* Socket flowlabel lists */ 229 230 struct ip6_flowlabel * fl6_sock_lookup(struct sock *sk, __be32 label) 231 { 232 struct ipv6_fl_socklist *sfl; 233 struct ipv6_pinfo *np = inet6_sk(sk); 234 235 label &= IPV6_FLOWLABEL_MASK; 236 237 read_lock_bh(&ip6_sk_fl_lock); 238 for (sfl=np->ipv6_fl_list; sfl; sfl = sfl->next) { 239 struct ip6_flowlabel *fl = sfl->fl; 240 if (fl->label == label) { 241 fl->lastuse = jiffies; 242 atomic_inc(&fl->users); 243 read_unlock_bh(&ip6_sk_fl_lock); 244 return fl; 245 } 246 } 247 read_unlock_bh(&ip6_sk_fl_lock); 248 return NULL; 249 } 250 251 EXPORT_SYMBOL_GPL(fl6_sock_lookup); 252 253 void fl6_free_socklist(struct sock *sk) 254 { 255 struct ipv6_pinfo *np = inet6_sk(sk); 256 struct ipv6_fl_socklist *sfl; 257 258 while ((sfl = np->ipv6_fl_list) != NULL) { 259 np->ipv6_fl_list = sfl->next; 260 fl_release(sfl->fl); 261 kfree(sfl); 262 } 263 } 264 265 /* Service routines */ 266 267 268 /* 269 It is the only difficult place. flowlabel enforces equal headers 270 before and including routing header, however user may supply options 271 following rthdr. 272 */ 273 274 struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space, 275 struct ip6_flowlabel * fl, 276 struct ipv6_txoptions * fopt) 277 { 278 struct ipv6_txoptions * fl_opt = fl->opt; 279 280 if (fopt == NULL || fopt->opt_flen == 0) 281 return fl_opt; 282 283 if (fl_opt != NULL) { 284 opt_space->hopopt = fl_opt->hopopt; 285 opt_space->dst0opt = fl_opt->dst0opt; 286 opt_space->srcrt = fl_opt->srcrt; 287 opt_space->opt_nflen = fl_opt->opt_nflen; 288 } else { 289 if (fopt->opt_nflen == 0) 290 return fopt; 291 opt_space->hopopt = NULL; 292 opt_space->dst0opt = NULL; 293 opt_space->srcrt = NULL; 294 opt_space->opt_nflen = 0; 295 } 296 opt_space->dst1opt = fopt->dst1opt; 297 opt_space->opt_flen = fopt->opt_flen; 298 return opt_space; 299 } 300 EXPORT_SYMBOL_GPL(fl6_merge_options); 301 302 static unsigned long check_linger(unsigned long ttl) 303 { 304 if (ttl < FL_MIN_LINGER) 305 return FL_MIN_LINGER*HZ; 306 if (ttl > FL_MAX_LINGER && !capable(CAP_NET_ADMIN)) 307 return 0; 308 return ttl*HZ; 309 } 310 311 static int fl6_renew(struct ip6_flowlabel *fl, unsigned long linger, unsigned long expires) 312 { 313 linger = check_linger(linger); 314 if (!linger) 315 return -EPERM; 316 expires = check_linger(expires); 317 if (!expires) 318 return -EPERM; 319 fl->lastuse = jiffies; 320 if (time_before(fl->linger, linger)) 321 fl->linger = linger; 322 if (time_before(expires, fl->linger)) 323 expires = fl->linger; 324 if (time_before(fl->expires, fl->lastuse + expires)) 325 fl->expires = fl->lastuse + expires; 326 return 0; 327 } 328 329 static struct ip6_flowlabel * 330 fl_create(struct net *net, struct sock *sk, struct in6_flowlabel_req *freq, 331 char __user *optval, int optlen, int *err_p) 332 { 333 struct ip6_flowlabel *fl = NULL; 334 int olen; 335 int addr_type; 336 int err; 337 338 olen = optlen - CMSG_ALIGN(sizeof(*freq)); 339 err = -EINVAL; 340 if (olen > 64 * 1024) 341 goto done; 342 343 err = -ENOMEM; 344 fl = kzalloc(sizeof(*fl), GFP_KERNEL); 345 if (fl == NULL) 346 goto done; 347 348 if (olen > 0) { 349 struct msghdr msg; 350 struct flowi6 flowi6; 351 int junk; 352 353 err = -ENOMEM; 354 fl->opt = kmalloc(sizeof(*fl->opt) + olen, GFP_KERNEL); 355 if (fl->opt == NULL) 356 goto done; 357 358 memset(fl->opt, 0, sizeof(*fl->opt)); 359 fl->opt->tot_len = sizeof(*fl->opt) + olen; 360 err = -EFAULT; 361 if (copy_from_user(fl->opt+1, optval+CMSG_ALIGN(sizeof(*freq)), olen)) 362 goto done; 363 364 msg.msg_controllen = olen; 365 msg.msg_control = (void*)(fl->opt+1); 366 memset(&flowi6, 0, sizeof(flowi6)); 367 368 err = datagram_send_ctl(net, sk, &msg, &flowi6, fl->opt, &junk, 369 &junk, &junk); 370 if (err) 371 goto done; 372 err = -EINVAL; 373 if (fl->opt->opt_flen) 374 goto done; 375 if (fl->opt->opt_nflen == 0) { 376 kfree(fl->opt); 377 fl->opt = NULL; 378 } 379 } 380 381 fl->fl_net = hold_net(net); 382 fl->expires = jiffies; 383 err = fl6_renew(fl, freq->flr_linger, freq->flr_expires); 384 if (err) 385 goto done; 386 fl->share = freq->flr_share; 387 addr_type = ipv6_addr_type(&freq->flr_dst); 388 if ((addr_type & IPV6_ADDR_MAPPED) || 389 addr_type == IPV6_ADDR_ANY) { 390 err = -EINVAL; 391 goto done; 392 } 393 fl->dst = freq->flr_dst; 394 atomic_set(&fl->users, 1); 395 switch (fl->share) { 396 case IPV6_FL_S_EXCL: 397 case IPV6_FL_S_ANY: 398 break; 399 case IPV6_FL_S_PROCESS: 400 fl->owner.pid = get_task_pid(current, PIDTYPE_PID); 401 break; 402 case IPV6_FL_S_USER: 403 fl->owner.uid = current_euid(); 404 break; 405 default: 406 err = -EINVAL; 407 goto done; 408 } 409 return fl; 410 411 done: 412 fl_free(fl); 413 *err_p = err; 414 return NULL; 415 } 416 417 static int mem_check(struct sock *sk) 418 { 419 struct ipv6_pinfo *np = inet6_sk(sk); 420 struct ipv6_fl_socklist *sfl; 421 int room = FL_MAX_SIZE - atomic_read(&fl_size); 422 int count = 0; 423 424 if (room > FL_MAX_SIZE - FL_MAX_PER_SOCK) 425 return 0; 426 427 for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) 428 count++; 429 430 if (room <= 0 || 431 ((count >= FL_MAX_PER_SOCK || 432 (count > 0 && room < FL_MAX_SIZE/2) || room < FL_MAX_SIZE/4) && 433 !capable(CAP_NET_ADMIN))) 434 return -ENOBUFS; 435 436 return 0; 437 } 438 439 static bool ipv6_hdr_cmp(struct ipv6_opt_hdr *h1, struct ipv6_opt_hdr *h2) 440 { 441 if (h1 == h2) 442 return false; 443 if (h1 == NULL || h2 == NULL) 444 return true; 445 if (h1->hdrlen != h2->hdrlen) 446 return true; 447 return memcmp(h1+1, h2+1, ((h1->hdrlen+1)<<3) - sizeof(*h1)); 448 } 449 450 static bool ipv6_opt_cmp(struct ipv6_txoptions *o1, struct ipv6_txoptions *o2) 451 { 452 if (o1 == o2) 453 return false; 454 if (o1 == NULL || o2 == NULL) 455 return true; 456 if (o1->opt_nflen != o2->opt_nflen) 457 return true; 458 if (ipv6_hdr_cmp(o1->hopopt, o2->hopopt)) 459 return true; 460 if (ipv6_hdr_cmp(o1->dst0opt, o2->dst0opt)) 461 return true; 462 if (ipv6_hdr_cmp((struct ipv6_opt_hdr *)o1->srcrt, (struct ipv6_opt_hdr *)o2->srcrt)) 463 return true; 464 return false; 465 } 466 467 static inline void fl_link(struct ipv6_pinfo *np, struct ipv6_fl_socklist *sfl, 468 struct ip6_flowlabel *fl) 469 { 470 write_lock_bh(&ip6_sk_fl_lock); 471 sfl->fl = fl; 472 sfl->next = np->ipv6_fl_list; 473 np->ipv6_fl_list = sfl; 474 write_unlock_bh(&ip6_sk_fl_lock); 475 } 476 477 int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen) 478 { 479 int uninitialized_var(err); 480 struct net *net = sock_net(sk); 481 struct ipv6_pinfo *np = inet6_sk(sk); 482 struct in6_flowlabel_req freq; 483 struct ipv6_fl_socklist *sfl1=NULL; 484 struct ipv6_fl_socklist *sfl, **sflp; 485 struct ip6_flowlabel *fl, *fl1 = NULL; 486 487 488 if (optlen < sizeof(freq)) 489 return -EINVAL; 490 491 if (copy_from_user(&freq, optval, sizeof(freq))) 492 return -EFAULT; 493 494 switch (freq.flr_action) { 495 case IPV6_FL_A_PUT: 496 write_lock_bh(&ip6_sk_fl_lock); 497 for (sflp = &np->ipv6_fl_list; (sfl=*sflp)!=NULL; sflp = &sfl->next) { 498 if (sfl->fl->label == freq.flr_label) { 499 if (freq.flr_label == (np->flow_label&IPV6_FLOWLABEL_MASK)) 500 np->flow_label &= ~IPV6_FLOWLABEL_MASK; 501 *sflp = sfl->next; 502 write_unlock_bh(&ip6_sk_fl_lock); 503 fl_release(sfl->fl); 504 kfree(sfl); 505 return 0; 506 } 507 } 508 write_unlock_bh(&ip6_sk_fl_lock); 509 return -ESRCH; 510 511 case IPV6_FL_A_RENEW: 512 read_lock_bh(&ip6_sk_fl_lock); 513 for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) { 514 if (sfl->fl->label == freq.flr_label) { 515 err = fl6_renew(sfl->fl, freq.flr_linger, freq.flr_expires); 516 read_unlock_bh(&ip6_sk_fl_lock); 517 return err; 518 } 519 } 520 read_unlock_bh(&ip6_sk_fl_lock); 521 522 if (freq.flr_share == IPV6_FL_S_NONE && capable(CAP_NET_ADMIN)) { 523 fl = fl_lookup(net, freq.flr_label); 524 if (fl) { 525 err = fl6_renew(fl, freq.flr_linger, freq.flr_expires); 526 fl_release(fl); 527 return err; 528 } 529 } 530 return -ESRCH; 531 532 case IPV6_FL_A_GET: 533 if (freq.flr_label & ~IPV6_FLOWLABEL_MASK) 534 return -EINVAL; 535 536 fl = fl_create(net, sk, &freq, optval, optlen, &err); 537 if (fl == NULL) 538 return err; 539 sfl1 = kmalloc(sizeof(*sfl1), GFP_KERNEL); 540 541 if (freq.flr_label) { 542 err = -EEXIST; 543 read_lock_bh(&ip6_sk_fl_lock); 544 for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) { 545 if (sfl->fl->label == freq.flr_label) { 546 if (freq.flr_flags&IPV6_FL_F_EXCL) { 547 read_unlock_bh(&ip6_sk_fl_lock); 548 goto done; 549 } 550 fl1 = sfl->fl; 551 atomic_inc(&fl1->users); 552 break; 553 } 554 } 555 read_unlock_bh(&ip6_sk_fl_lock); 556 557 if (fl1 == NULL) 558 fl1 = fl_lookup(net, freq.flr_label); 559 if (fl1) { 560 recheck: 561 err = -EEXIST; 562 if (freq.flr_flags&IPV6_FL_F_EXCL) 563 goto release; 564 err = -EPERM; 565 if (fl1->share == IPV6_FL_S_EXCL || 566 fl1->share != fl->share || 567 ((fl1->share == IPV6_FL_S_PROCESS) && 568 (fl1->owner.pid == fl->owner.pid)) || 569 ((fl1->share == IPV6_FL_S_USER) && 570 uid_eq(fl1->owner.uid, fl->owner.uid))) 571 goto release; 572 573 err = -EINVAL; 574 if (!ipv6_addr_equal(&fl1->dst, &fl->dst) || 575 ipv6_opt_cmp(fl1->opt, fl->opt)) 576 goto release; 577 578 err = -ENOMEM; 579 if (sfl1 == NULL) 580 goto release; 581 if (fl->linger > fl1->linger) 582 fl1->linger = fl->linger; 583 if ((long)(fl->expires - fl1->expires) > 0) 584 fl1->expires = fl->expires; 585 fl_link(np, sfl1, fl1); 586 fl_free(fl); 587 return 0; 588 589 release: 590 fl_release(fl1); 591 goto done; 592 } 593 } 594 err = -ENOENT; 595 if (!(freq.flr_flags&IPV6_FL_F_CREATE)) 596 goto done; 597 598 err = -ENOMEM; 599 if (sfl1 == NULL || (err = mem_check(sk)) != 0) 600 goto done; 601 602 fl1 = fl_intern(net, fl, freq.flr_label); 603 if (fl1 != NULL) 604 goto recheck; 605 606 if (!freq.flr_label) { 607 if (copy_to_user(&((struct in6_flowlabel_req __user *) optval)->flr_label, 608 &fl->label, sizeof(fl->label))) { 609 /* Intentionally ignore fault. */ 610 } 611 } 612 613 fl_link(np, sfl1, fl); 614 return 0; 615 616 default: 617 return -EINVAL; 618 } 619 620 done: 621 fl_free(fl); 622 kfree(sfl1); 623 return err; 624 } 625 626 #ifdef CONFIG_PROC_FS 627 628 struct ip6fl_iter_state { 629 struct seq_net_private p; 630 struct pid_namespace *pid_ns; 631 int bucket; 632 }; 633 634 #define ip6fl_seq_private(seq) ((struct ip6fl_iter_state *)(seq)->private) 635 636 static struct ip6_flowlabel *ip6fl_get_first(struct seq_file *seq) 637 { 638 struct ip6_flowlabel *fl = NULL; 639 struct ip6fl_iter_state *state = ip6fl_seq_private(seq); 640 struct net *net = seq_file_net(seq); 641 642 for (state->bucket = 0; state->bucket <= FL_HASH_MASK; ++state->bucket) { 643 fl = fl_ht[state->bucket]; 644 645 while (fl && !net_eq(fl->fl_net, net)) 646 fl = fl->next; 647 if (fl) 648 break; 649 } 650 return fl; 651 } 652 653 static struct ip6_flowlabel *ip6fl_get_next(struct seq_file *seq, struct ip6_flowlabel *fl) 654 { 655 struct ip6fl_iter_state *state = ip6fl_seq_private(seq); 656 struct net *net = seq_file_net(seq); 657 658 fl = fl->next; 659 try_again: 660 while (fl && !net_eq(fl->fl_net, net)) 661 fl = fl->next; 662 663 while (!fl) { 664 if (++state->bucket <= FL_HASH_MASK) { 665 fl = fl_ht[state->bucket]; 666 goto try_again; 667 } else 668 break; 669 } 670 return fl; 671 } 672 673 static struct ip6_flowlabel *ip6fl_get_idx(struct seq_file *seq, loff_t pos) 674 { 675 struct ip6_flowlabel *fl = ip6fl_get_first(seq); 676 if (fl) 677 while (pos && (fl = ip6fl_get_next(seq, fl)) != NULL) 678 --pos; 679 return pos ? NULL : fl; 680 } 681 682 static void *ip6fl_seq_start(struct seq_file *seq, loff_t *pos) 683 __acquires(ip6_fl_lock) 684 { 685 read_lock_bh(&ip6_fl_lock); 686 return *pos ? ip6fl_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 687 } 688 689 static void *ip6fl_seq_next(struct seq_file *seq, void *v, loff_t *pos) 690 { 691 struct ip6_flowlabel *fl; 692 693 if (v == SEQ_START_TOKEN) 694 fl = ip6fl_get_first(seq); 695 else 696 fl = ip6fl_get_next(seq, v); 697 ++*pos; 698 return fl; 699 } 700 701 static void ip6fl_seq_stop(struct seq_file *seq, void *v) 702 __releases(ip6_fl_lock) 703 { 704 read_unlock_bh(&ip6_fl_lock); 705 } 706 707 static int ip6fl_seq_show(struct seq_file *seq, void *v) 708 { 709 struct ip6fl_iter_state *state = ip6fl_seq_private(seq); 710 if (v == SEQ_START_TOKEN) 711 seq_printf(seq, "%-5s %-1s %-6s %-6s %-6s %-8s %-32s %s\n", 712 "Label", "S", "Owner", "Users", "Linger", "Expires", "Dst", "Opt"); 713 else { 714 struct ip6_flowlabel *fl = v; 715 seq_printf(seq, 716 "%05X %-1d %-6d %-6d %-6ld %-8ld %pi6 %-4d\n", 717 (unsigned int)ntohl(fl->label), 718 fl->share, 719 ((fl->share == IPV6_FL_S_PROCESS) ? 720 pid_nr_ns(fl->owner.pid, state->pid_ns) : 721 ((fl->share == IPV6_FL_S_USER) ? 722 from_kuid_munged(seq_user_ns(seq), fl->owner.uid) : 723 0)), 724 atomic_read(&fl->users), 725 fl->linger/HZ, 726 (long)(fl->expires - jiffies)/HZ, 727 &fl->dst, 728 fl->opt ? fl->opt->opt_nflen : 0); 729 } 730 return 0; 731 } 732 733 static const struct seq_operations ip6fl_seq_ops = { 734 .start = ip6fl_seq_start, 735 .next = ip6fl_seq_next, 736 .stop = ip6fl_seq_stop, 737 .show = ip6fl_seq_show, 738 }; 739 740 static int ip6fl_seq_open(struct inode *inode, struct file *file) 741 { 742 struct seq_file *seq; 743 struct ip6fl_iter_state *state; 744 int err; 745 746 err = seq_open_net(inode, file, &ip6fl_seq_ops, 747 sizeof(struct ip6fl_iter_state)); 748 749 if (!err) { 750 seq = file->private_data; 751 state = ip6fl_seq_private(seq); 752 rcu_read_lock(); 753 state->pid_ns = get_pid_ns(task_active_pid_ns(current)); 754 rcu_read_unlock(); 755 } 756 return err; 757 } 758 759 static int ip6fl_seq_release(struct inode *inode, struct file *file) 760 { 761 struct seq_file *seq = file->private_data; 762 struct ip6fl_iter_state *state = ip6fl_seq_private(seq); 763 put_pid_ns(state->pid_ns); 764 return seq_release_net(inode, file); 765 } 766 767 static const struct file_operations ip6fl_seq_fops = { 768 .owner = THIS_MODULE, 769 .open = ip6fl_seq_open, 770 .read = seq_read, 771 .llseek = seq_lseek, 772 .release = ip6fl_seq_release, 773 }; 774 775 static int __net_init ip6_flowlabel_proc_init(struct net *net) 776 { 777 if (!proc_net_fops_create(net, "ip6_flowlabel", 778 S_IRUGO, &ip6fl_seq_fops)) 779 return -ENOMEM; 780 return 0; 781 } 782 783 static void __net_exit ip6_flowlabel_proc_fini(struct net *net) 784 { 785 proc_net_remove(net, "ip6_flowlabel"); 786 } 787 #else 788 static inline int ip6_flowlabel_proc_init(struct net *net) 789 { 790 return 0; 791 } 792 static inline void ip6_flowlabel_proc_fini(struct net *net) 793 { 794 } 795 #endif 796 797 static void __net_exit ip6_flowlabel_net_exit(struct net *net) 798 { 799 ip6_fl_purge(net); 800 ip6_flowlabel_proc_fini(net); 801 } 802 803 static struct pernet_operations ip6_flowlabel_net_ops = { 804 .init = ip6_flowlabel_proc_init, 805 .exit = ip6_flowlabel_net_exit, 806 }; 807 808 int ip6_flowlabel_init(void) 809 { 810 return register_pernet_subsys(&ip6_flowlabel_net_ops); 811 } 812 813 void ip6_flowlabel_cleanup(void) 814 { 815 del_timer(&ip6_fl_gc_timer); 816 unregister_pernet_subsys(&ip6_flowlabel_net_ops); 817 } 818