1 /* 2 * IPv6 Address [auto]configuration 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 8 * 9 * $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $ 10 * 11 * This program is free software; you can redistribute it and/or 12 * modify it under the terms of the GNU General Public License 13 * as published by the Free Software Foundation; either version 14 * 2 of the License, or (at your option) any later version. 15 */ 16 17 /* 18 * Changes: 19 * 20 * Janos Farkas : delete timer on ifdown 21 * <chexum@bankinf.banki.hu> 22 * Andi Kleen : kill double kfree on module 23 * unload. 24 * Maciej W. Rozycki : FDDI support 25 * sekiya@USAGI : Don't send too many RS 26 * packets. 27 * yoshfuji@USAGI : Fixed interval between DAD 28 * packets. 29 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 30 * address validation timer. 31 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 32 * support. 33 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 34 * address on a same interface. 35 * YOSHIFUJI Hideaki @USAGI : ARCnet support 36 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 37 * seq_file. 38 * YOSHIFUJI Hideaki @USAGI : improved source address 39 * selection; consider scope, 40 * status etc. 41 */ 42 43 #include <linux/errno.h> 44 #include <linux/types.h> 45 #include <linux/socket.h> 46 #include <linux/sockios.h> 47 #include <linux/sched.h> 48 #include <linux/net.h> 49 #include <linux/in6.h> 50 #include <linux/netdevice.h> 51 #include <linux/if_arp.h> 52 #include <linux/if_arcnet.h> 53 #include <linux/if_infiniband.h> 54 #include <linux/route.h> 55 #include <linux/inetdevice.h> 56 #include <linux/init.h> 57 #ifdef CONFIG_SYSCTL 58 #include <linux/sysctl.h> 59 #endif 60 #include <linux/capability.h> 61 #include <linux/delay.h> 62 #include <linux/notifier.h> 63 #include <linux/string.h> 64 65 #include <net/sock.h> 66 #include <net/snmp.h> 67 68 #include <net/ipv6.h> 69 #include <net/protocol.h> 70 #include <net/ndisc.h> 71 #include <net/ip6_route.h> 72 #include <net/addrconf.h> 73 #include <net/tcp.h> 74 #include <net/ip.h> 75 #include <linux/if_tunnel.h> 76 #include <linux/rtnetlink.h> 77 78 #ifdef CONFIG_IPV6_PRIVACY 79 #include <linux/random.h> 80 #endif 81 82 #include <asm/uaccess.h> 83 84 #include <linux/proc_fs.h> 85 #include <linux/seq_file.h> 86 87 /* Set to 3 to get tracing... */ 88 #define ACONF_DEBUG 2 89 90 #if ACONF_DEBUG >= 3 91 #define ADBG(x) printk x 92 #else 93 #define ADBG(x) 94 #endif 95 96 #define INFINITY_LIFE_TIME 0xFFFFFFFF 97 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b))) 98 99 #ifdef CONFIG_SYSCTL 100 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p); 101 static void addrconf_sysctl_unregister(struct ipv6_devconf *p); 102 #endif 103 104 #ifdef CONFIG_IPV6_PRIVACY 105 static int __ipv6_regen_rndid(struct inet6_dev *idev); 106 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 107 static void ipv6_regen_rndid(unsigned long data); 108 109 static int desync_factor = MAX_DESYNC_FACTOR * HZ; 110 #endif 111 112 static int ipv6_count_addresses(struct inet6_dev *idev); 113 114 /* 115 * Configured unicast address hash table 116 */ 117 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE]; 118 static DEFINE_RWLOCK(addrconf_hash_lock); 119 120 /* Protects inet6 devices */ 121 DEFINE_RWLOCK(addrconf_lock); 122 123 static void addrconf_verify(unsigned long); 124 125 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0); 126 static DEFINE_SPINLOCK(addrconf_verify_lock); 127 128 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 129 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 130 131 static int addrconf_ifdown(struct net_device *dev, int how); 132 133 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags); 134 static void addrconf_dad_timer(unsigned long data); 135 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 136 static void addrconf_dad_run(struct inet6_dev *idev); 137 static void addrconf_rs_timer(unsigned long data); 138 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 139 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 140 141 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 142 struct prefix_info *pinfo); 143 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev); 144 145 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain); 146 147 struct ipv6_devconf ipv6_devconf = { 148 .forwarding = 0, 149 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 150 .mtu6 = IPV6_MIN_MTU, 151 .accept_ra = 1, 152 .accept_redirects = 1, 153 .autoconf = 1, 154 .force_mld_version = 0, 155 .dad_transmits = 1, 156 .rtr_solicits = MAX_RTR_SOLICITATIONS, 157 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 158 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 159 #ifdef CONFIG_IPV6_PRIVACY 160 .use_tempaddr = 0, 161 .temp_valid_lft = TEMP_VALID_LIFETIME, 162 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 163 .regen_max_retry = REGEN_MAX_RETRY, 164 .max_desync_factor = MAX_DESYNC_FACTOR, 165 #endif 166 .max_addresses = IPV6_MAX_ADDRESSES, 167 .accept_ra_defrtr = 1, 168 .accept_ra_pinfo = 1, 169 #ifdef CONFIG_IPV6_ROUTER_PREF 170 .accept_ra_rtr_pref = 1, 171 .rtr_probe_interval = 60 * HZ, 172 #ifdef CONFIG_IPV6_ROUTE_INFO 173 .accept_ra_rt_info_max_plen = 0, 174 #endif 175 #endif 176 }; 177 178 static struct ipv6_devconf ipv6_devconf_dflt = { 179 .forwarding = 0, 180 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 181 .mtu6 = IPV6_MIN_MTU, 182 .accept_ra = 1, 183 .accept_redirects = 1, 184 .autoconf = 1, 185 .dad_transmits = 1, 186 .rtr_solicits = MAX_RTR_SOLICITATIONS, 187 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 188 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 189 #ifdef CONFIG_IPV6_PRIVACY 190 .use_tempaddr = 0, 191 .temp_valid_lft = TEMP_VALID_LIFETIME, 192 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 193 .regen_max_retry = REGEN_MAX_RETRY, 194 .max_desync_factor = MAX_DESYNC_FACTOR, 195 #endif 196 .max_addresses = IPV6_MAX_ADDRESSES, 197 .accept_ra_defrtr = 1, 198 .accept_ra_pinfo = 1, 199 #ifdef CONFIG_IPV6_ROUTER_PREF 200 .accept_ra_rtr_pref = 1, 201 .rtr_probe_interval = 60 * HZ, 202 #ifdef CONFIG_IPV6_ROUTE_INFO 203 .accept_ra_rt_info_max_plen = 0, 204 #endif 205 #endif 206 }; 207 208 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */ 209 #if 0 210 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 211 #endif 212 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 213 214 #define IPV6_ADDR_SCOPE_TYPE(scope) ((scope) << 16) 215 216 static inline unsigned ipv6_addr_scope2type(unsigned scope) 217 { 218 switch(scope) { 219 case IPV6_ADDR_SCOPE_NODELOCAL: 220 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) | 221 IPV6_ADDR_LOOPBACK); 222 case IPV6_ADDR_SCOPE_LINKLOCAL: 223 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) | 224 IPV6_ADDR_LINKLOCAL); 225 case IPV6_ADDR_SCOPE_SITELOCAL: 226 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) | 227 IPV6_ADDR_SITELOCAL); 228 } 229 return IPV6_ADDR_SCOPE_TYPE(scope); 230 } 231 232 int __ipv6_addr_type(const struct in6_addr *addr) 233 { 234 u32 st; 235 236 st = addr->s6_addr32[0]; 237 238 /* Consider all addresses with the first three bits different of 239 000 and 111 as unicasts. 240 */ 241 if ((st & htonl(0xE0000000)) != htonl(0x00000000) && 242 (st & htonl(0xE0000000)) != htonl(0xE0000000)) 243 return (IPV6_ADDR_UNICAST | 244 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); 245 246 if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) { 247 /* multicast */ 248 /* addr-select 3.1 */ 249 return (IPV6_ADDR_MULTICAST | 250 ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr))); 251 } 252 253 if ((st & htonl(0xFFC00000)) == htonl(0xFE800000)) 254 return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST | 255 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.1 */ 256 if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000)) 257 return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST | 258 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL)); /* addr-select 3.1 */ 259 260 if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) { 261 if (addr->s6_addr32[2] == 0) { 262 if (addr->s6_addr32[3] == 0) 263 return IPV6_ADDR_ANY; 264 265 if (addr->s6_addr32[3] == htonl(0x00000001)) 266 return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST | 267 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.4 */ 268 269 return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST | 270 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */ 271 } 272 273 if (addr->s6_addr32[2] == htonl(0x0000ffff)) 274 return (IPV6_ADDR_MAPPED | 275 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */ 276 } 277 278 return (IPV6_ADDR_RESERVED | 279 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.4 */ 280 } 281 282 static void addrconf_del_timer(struct inet6_ifaddr *ifp) 283 { 284 if (del_timer(&ifp->timer)) 285 __in6_ifa_put(ifp); 286 } 287 288 enum addrconf_timer_t 289 { 290 AC_NONE, 291 AC_DAD, 292 AC_RS, 293 }; 294 295 static void addrconf_mod_timer(struct inet6_ifaddr *ifp, 296 enum addrconf_timer_t what, 297 unsigned long when) 298 { 299 if (!del_timer(&ifp->timer)) 300 in6_ifa_hold(ifp); 301 302 switch (what) { 303 case AC_DAD: 304 ifp->timer.function = addrconf_dad_timer; 305 break; 306 case AC_RS: 307 ifp->timer.function = addrconf_rs_timer; 308 break; 309 default:; 310 } 311 ifp->timer.expires = jiffies + when; 312 add_timer(&ifp->timer); 313 } 314 315 /* Nobody refers to this device, we may destroy it. */ 316 317 void in6_dev_finish_destroy(struct inet6_dev *idev) 318 { 319 struct net_device *dev = idev->dev; 320 BUG_TRAP(idev->addr_list==NULL); 321 BUG_TRAP(idev->mc_list==NULL); 322 #ifdef NET_REFCNT_DEBUG 323 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL"); 324 #endif 325 dev_put(dev); 326 if (!idev->dead) { 327 printk("Freeing alive inet6 device %p\n", idev); 328 return; 329 } 330 snmp6_free_dev(idev); 331 kfree(idev); 332 } 333 334 static struct inet6_dev * ipv6_add_dev(struct net_device *dev) 335 { 336 struct inet6_dev *ndev; 337 338 ASSERT_RTNL(); 339 340 if (dev->mtu < IPV6_MIN_MTU) 341 return NULL; 342 343 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 344 345 if (ndev == NULL) 346 return NULL; 347 348 rwlock_init(&ndev->lock); 349 ndev->dev = dev; 350 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf)); 351 ndev->cnf.mtu6 = dev->mtu; 352 ndev->cnf.sysctl = NULL; 353 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 354 if (ndev->nd_parms == NULL) { 355 kfree(ndev); 356 return NULL; 357 } 358 /* We refer to the device */ 359 dev_hold(dev); 360 361 if (snmp6_alloc_dev(ndev) < 0) { 362 ADBG((KERN_WARNING 363 "%s(): cannot allocate memory for statistics; dev=%s.\n", 364 __FUNCTION__, dev->name)); 365 neigh_parms_release(&nd_tbl, ndev->nd_parms); 366 ndev->dead = 1; 367 in6_dev_finish_destroy(ndev); 368 return NULL; 369 } 370 371 if (snmp6_register_dev(ndev) < 0) { 372 ADBG((KERN_WARNING 373 "%s(): cannot create /proc/net/dev_snmp6/%s\n", 374 __FUNCTION__, dev->name)); 375 neigh_parms_release(&nd_tbl, ndev->nd_parms); 376 ndev->dead = 1; 377 in6_dev_finish_destroy(ndev); 378 return NULL; 379 } 380 381 /* One reference from device. We must do this before 382 * we invoke __ipv6_regen_rndid(). 383 */ 384 in6_dev_hold(ndev); 385 386 #ifdef CONFIG_IPV6_PRIVACY 387 init_timer(&ndev->regen_timer); 388 ndev->regen_timer.function = ipv6_regen_rndid; 389 ndev->regen_timer.data = (unsigned long) ndev; 390 if ((dev->flags&IFF_LOOPBACK) || 391 dev->type == ARPHRD_TUNNEL || 392 dev->type == ARPHRD_NONE || 393 dev->type == ARPHRD_SIT) { 394 printk(KERN_INFO 395 "%s: Disabled Privacy Extensions\n", 396 dev->name); 397 ndev->cnf.use_tempaddr = -1; 398 } else { 399 in6_dev_hold(ndev); 400 ipv6_regen_rndid((unsigned long) ndev); 401 } 402 #endif 403 404 if (netif_carrier_ok(dev)) 405 ndev->if_flags |= IF_READY; 406 407 write_lock_bh(&addrconf_lock); 408 dev->ip6_ptr = ndev; 409 write_unlock_bh(&addrconf_lock); 410 411 ipv6_mc_init_dev(ndev); 412 ndev->tstamp = jiffies; 413 #ifdef CONFIG_SYSCTL 414 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6, 415 NET_IPV6_NEIGH, "ipv6", 416 &ndisc_ifinfo_sysctl_change, 417 NULL); 418 addrconf_sysctl_register(ndev, &ndev->cnf); 419 #endif 420 return ndev; 421 } 422 423 static struct inet6_dev * ipv6_find_idev(struct net_device *dev) 424 { 425 struct inet6_dev *idev; 426 427 ASSERT_RTNL(); 428 429 if ((idev = __in6_dev_get(dev)) == NULL) { 430 if ((idev = ipv6_add_dev(dev)) == NULL) 431 return NULL; 432 } 433 434 if (dev->flags&IFF_UP) 435 ipv6_mc_up(idev); 436 return idev; 437 } 438 439 #ifdef CONFIG_SYSCTL 440 static void dev_forward_change(struct inet6_dev *idev) 441 { 442 struct net_device *dev; 443 struct inet6_ifaddr *ifa; 444 struct in6_addr addr; 445 446 if (!idev) 447 return; 448 dev = idev->dev; 449 if (dev && (dev->flags & IFF_MULTICAST)) { 450 ipv6_addr_all_routers(&addr); 451 452 if (idev->cnf.forwarding) 453 ipv6_dev_mc_inc(dev, &addr); 454 else 455 ipv6_dev_mc_dec(dev, &addr); 456 } 457 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) { 458 if (idev->cnf.forwarding) 459 addrconf_join_anycast(ifa); 460 else 461 addrconf_leave_anycast(ifa); 462 } 463 } 464 465 466 static void addrconf_forward_change(void) 467 { 468 struct net_device *dev; 469 struct inet6_dev *idev; 470 471 read_lock(&dev_base_lock); 472 for (dev=dev_base; dev; dev=dev->next) { 473 read_lock(&addrconf_lock); 474 idev = __in6_dev_get(dev); 475 if (idev) { 476 int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding); 477 idev->cnf.forwarding = ipv6_devconf.forwarding; 478 if (changed) 479 dev_forward_change(idev); 480 } 481 read_unlock(&addrconf_lock); 482 } 483 read_unlock(&dev_base_lock); 484 } 485 #endif 486 487 /* Nobody refers to this ifaddr, destroy it */ 488 489 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 490 { 491 BUG_TRAP(ifp->if_next==NULL); 492 BUG_TRAP(ifp->lst_next==NULL); 493 #ifdef NET_REFCNT_DEBUG 494 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n"); 495 #endif 496 497 in6_dev_put(ifp->idev); 498 499 if (del_timer(&ifp->timer)) 500 printk("Timer is still running, when freeing ifa=%p\n", ifp); 501 502 if (!ifp->dead) { 503 printk("Freeing alive inet6 address %p\n", ifp); 504 return; 505 } 506 dst_release(&ifp->rt->u.dst); 507 508 kfree(ifp); 509 } 510 511 static void 512 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 513 { 514 struct inet6_ifaddr *ifa, **ifap; 515 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 516 517 /* 518 * Each device address list is sorted in order of scope - 519 * global before linklocal. 520 */ 521 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL; 522 ifap = &ifa->if_next) { 523 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 524 break; 525 } 526 527 ifp->if_next = *ifap; 528 *ifap = ifp; 529 } 530 531 /* On success it returns ifp with increased reference count */ 532 533 static struct inet6_ifaddr * 534 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen, 535 int scope, u32 flags) 536 { 537 struct inet6_ifaddr *ifa = NULL; 538 struct rt6_info *rt; 539 int hash; 540 int err = 0; 541 542 read_lock_bh(&addrconf_lock); 543 if (idev->dead) { 544 err = -ENODEV; /*XXX*/ 545 goto out2; 546 } 547 548 write_lock(&addrconf_hash_lock); 549 550 /* Ignore adding duplicate addresses on an interface */ 551 if (ipv6_chk_same_addr(addr, idev->dev)) { 552 ADBG(("ipv6_add_addr: already assigned\n")); 553 err = -EEXIST; 554 goto out; 555 } 556 557 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 558 559 if (ifa == NULL) { 560 ADBG(("ipv6_add_addr: malloc failed\n")); 561 err = -ENOBUFS; 562 goto out; 563 } 564 565 rt = addrconf_dst_alloc(idev, addr, 0); 566 if (IS_ERR(rt)) { 567 err = PTR_ERR(rt); 568 goto out; 569 } 570 571 ipv6_addr_copy(&ifa->addr, addr); 572 573 spin_lock_init(&ifa->lock); 574 init_timer(&ifa->timer); 575 ifa->timer.data = (unsigned long) ifa; 576 ifa->scope = scope; 577 ifa->prefix_len = pfxlen; 578 ifa->flags = flags | IFA_F_TENTATIVE; 579 ifa->cstamp = ifa->tstamp = jiffies; 580 581 ifa->rt = rt; 582 583 ifa->idev = idev; 584 in6_dev_hold(idev); 585 /* For caller */ 586 in6_ifa_hold(ifa); 587 588 /* Add to big hash table */ 589 hash = ipv6_addr_hash(addr); 590 591 ifa->lst_next = inet6_addr_lst[hash]; 592 inet6_addr_lst[hash] = ifa; 593 in6_ifa_hold(ifa); 594 write_unlock(&addrconf_hash_lock); 595 596 write_lock(&idev->lock); 597 /* Add to inet6_dev unicast addr list. */ 598 ipv6_link_dev_addr(idev, ifa); 599 600 #ifdef CONFIG_IPV6_PRIVACY 601 if (ifa->flags&IFA_F_TEMPORARY) { 602 ifa->tmp_next = idev->tempaddr_list; 603 idev->tempaddr_list = ifa; 604 in6_ifa_hold(ifa); 605 } 606 #endif 607 608 in6_ifa_hold(ifa); 609 write_unlock(&idev->lock); 610 out2: 611 read_unlock_bh(&addrconf_lock); 612 613 if (likely(err == 0)) 614 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa); 615 else { 616 kfree(ifa); 617 ifa = ERR_PTR(err); 618 } 619 620 return ifa; 621 out: 622 write_unlock(&addrconf_hash_lock); 623 goto out2; 624 } 625 626 /* This function wants to get referenced ifp and releases it before return */ 627 628 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 629 { 630 struct inet6_ifaddr *ifa, **ifap; 631 struct inet6_dev *idev = ifp->idev; 632 int hash; 633 int deleted = 0, onlink = 0; 634 unsigned long expires = jiffies; 635 636 hash = ipv6_addr_hash(&ifp->addr); 637 638 ifp->dead = 1; 639 640 write_lock_bh(&addrconf_hash_lock); 641 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL; 642 ifap = &ifa->lst_next) { 643 if (ifa == ifp) { 644 *ifap = ifa->lst_next; 645 __in6_ifa_put(ifp); 646 ifa->lst_next = NULL; 647 break; 648 } 649 } 650 write_unlock_bh(&addrconf_hash_lock); 651 652 write_lock_bh(&idev->lock); 653 #ifdef CONFIG_IPV6_PRIVACY 654 if (ifp->flags&IFA_F_TEMPORARY) { 655 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL; 656 ifap = &ifa->tmp_next) { 657 if (ifa == ifp) { 658 *ifap = ifa->tmp_next; 659 if (ifp->ifpub) { 660 in6_ifa_put(ifp->ifpub); 661 ifp->ifpub = NULL; 662 } 663 __in6_ifa_put(ifp); 664 ifa->tmp_next = NULL; 665 break; 666 } 667 } 668 } 669 #endif 670 671 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) { 672 if (ifa == ifp) { 673 *ifap = ifa->if_next; 674 __in6_ifa_put(ifp); 675 ifa->if_next = NULL; 676 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 677 break; 678 deleted = 1; 679 continue; 680 } else if (ifp->flags & IFA_F_PERMANENT) { 681 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 682 ifp->prefix_len)) { 683 if (ifa->flags & IFA_F_PERMANENT) { 684 onlink = 1; 685 if (deleted) 686 break; 687 } else { 688 unsigned long lifetime; 689 690 if (!onlink) 691 onlink = -1; 692 693 spin_lock(&ifa->lock); 694 lifetime = min_t(unsigned long, 695 ifa->valid_lft, 0x7fffffffUL/HZ); 696 if (time_before(expires, 697 ifa->tstamp + lifetime * HZ)) 698 expires = ifa->tstamp + lifetime * HZ; 699 spin_unlock(&ifa->lock); 700 } 701 } 702 } 703 ifap = &ifa->if_next; 704 } 705 write_unlock_bh(&idev->lock); 706 707 ipv6_ifa_notify(RTM_DELADDR, ifp); 708 709 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp); 710 711 addrconf_del_timer(ifp); 712 713 /* 714 * Purge or update corresponding prefix 715 * 716 * 1) we don't purge prefix here if address was not permanent. 717 * prefix is managed by its own lifetime. 718 * 2) if there're no addresses, delete prefix. 719 * 3) if there're still other permanent address(es), 720 * corresponding prefix is still permanent. 721 * 4) otherwise, update prefix lifetime to the 722 * longest valid lifetime among the corresponding 723 * addresses on the device. 724 * Note: subsequent RA will update lifetime. 725 * 726 * --yoshfuji 727 */ 728 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 729 struct in6_addr prefix; 730 struct rt6_info *rt; 731 732 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 733 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1); 734 735 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) { 736 if (onlink == 0) { 737 ip6_del_rt(rt, NULL, NULL, NULL); 738 rt = NULL; 739 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 740 rt->rt6i_expires = expires; 741 rt->rt6i_flags |= RTF_EXPIRES; 742 } 743 } 744 dst_release(&rt->u.dst); 745 } 746 747 in6_ifa_put(ifp); 748 } 749 750 #ifdef CONFIG_IPV6_PRIVACY 751 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 752 { 753 struct inet6_dev *idev = ifp->idev; 754 struct in6_addr addr, *tmpaddr; 755 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp; 756 int tmp_plen; 757 int ret = 0; 758 int max_addresses; 759 760 write_lock(&idev->lock); 761 if (ift) { 762 spin_lock_bh(&ift->lock); 763 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 764 spin_unlock_bh(&ift->lock); 765 tmpaddr = &addr; 766 } else { 767 tmpaddr = NULL; 768 } 769 retry: 770 in6_dev_hold(idev); 771 if (idev->cnf.use_tempaddr <= 0) { 772 write_unlock(&idev->lock); 773 printk(KERN_INFO 774 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n"); 775 in6_dev_put(idev); 776 ret = -1; 777 goto out; 778 } 779 spin_lock_bh(&ifp->lock); 780 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 781 idev->cnf.use_tempaddr = -1; /*XXX*/ 782 spin_unlock_bh(&ifp->lock); 783 write_unlock(&idev->lock); 784 printk(KERN_WARNING 785 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n"); 786 in6_dev_put(idev); 787 ret = -1; 788 goto out; 789 } 790 in6_ifa_hold(ifp); 791 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 792 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) { 793 spin_unlock_bh(&ifp->lock); 794 write_unlock(&idev->lock); 795 printk(KERN_WARNING 796 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n"); 797 in6_ifa_put(ifp); 798 in6_dev_put(idev); 799 ret = -1; 800 goto out; 801 } 802 memcpy(&addr.s6_addr[8], idev->rndid, 8); 803 tmp_valid_lft = min_t(__u32, 804 ifp->valid_lft, 805 idev->cnf.temp_valid_lft); 806 tmp_prefered_lft = min_t(__u32, 807 ifp->prefered_lft, 808 idev->cnf.temp_prefered_lft - desync_factor / HZ); 809 tmp_plen = ifp->prefix_len; 810 max_addresses = idev->cnf.max_addresses; 811 tmp_cstamp = ifp->cstamp; 812 tmp_tstamp = ifp->tstamp; 813 spin_unlock_bh(&ifp->lock); 814 815 write_unlock(&idev->lock); 816 ift = !max_addresses || 817 ipv6_count_addresses(idev) < max_addresses ? 818 ipv6_add_addr(idev, &addr, tmp_plen, 819 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL; 820 if (!ift || IS_ERR(ift)) { 821 in6_ifa_put(ifp); 822 in6_dev_put(idev); 823 printk(KERN_INFO 824 "ipv6_create_tempaddr(): retry temporary address regeneration.\n"); 825 tmpaddr = &addr; 826 write_lock(&idev->lock); 827 goto retry; 828 } 829 830 spin_lock_bh(&ift->lock); 831 ift->ifpub = ifp; 832 ift->valid_lft = tmp_valid_lft; 833 ift->prefered_lft = tmp_prefered_lft; 834 ift->cstamp = tmp_cstamp; 835 ift->tstamp = tmp_tstamp; 836 spin_unlock_bh(&ift->lock); 837 838 addrconf_dad_start(ift, 0); 839 in6_ifa_put(ift); 840 in6_dev_put(idev); 841 out: 842 return ret; 843 } 844 #endif 845 846 /* 847 * Choose an appropriate source address (RFC3484) 848 */ 849 struct ipv6_saddr_score { 850 int addr_type; 851 unsigned int attrs; 852 int matchlen; 853 int scope; 854 unsigned int rule; 855 }; 856 857 #define IPV6_SADDR_SCORE_LOCAL 0x0001 858 #define IPV6_SADDR_SCORE_PREFERRED 0x0004 859 #define IPV6_SADDR_SCORE_HOA 0x0008 860 #define IPV6_SADDR_SCORE_OIF 0x0010 861 #define IPV6_SADDR_SCORE_LABEL 0x0020 862 #define IPV6_SADDR_SCORE_PRIVACY 0x0040 863 864 static int inline ipv6_saddr_preferred(int type) 865 { 866 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4| 867 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED)) 868 return 1; 869 return 0; 870 } 871 872 /* static matching label */ 873 static int inline ipv6_saddr_label(const struct in6_addr *addr, int type) 874 { 875 /* 876 * prefix (longest match) label 877 * ----------------------------- 878 * ::1/128 0 879 * ::/0 1 880 * 2002::/16 2 881 * ::/96 3 882 * ::ffff:0:0/96 4 883 * fc00::/7 5 884 * 2001::/32 6 885 */ 886 if (type & IPV6_ADDR_LOOPBACK) 887 return 0; 888 else if (type & IPV6_ADDR_COMPATv4) 889 return 3; 890 else if (type & IPV6_ADDR_MAPPED) 891 return 4; 892 else if (addr->s6_addr32[0] == htonl(0x20010000)) 893 return 6; 894 else if (addr->s6_addr16[0] == htons(0x2002)) 895 return 2; 896 else if ((addr->s6_addr[0] & 0xfe) == 0xfc) 897 return 5; 898 return 1; 899 } 900 901 int ipv6_dev_get_saddr(struct net_device *daddr_dev, 902 struct in6_addr *daddr, struct in6_addr *saddr) 903 { 904 struct ipv6_saddr_score hiscore; 905 struct inet6_ifaddr *ifa_result = NULL; 906 int daddr_type = __ipv6_addr_type(daddr); 907 int daddr_scope = __ipv6_addr_src_scope(daddr_type); 908 u32 daddr_label = ipv6_saddr_label(daddr, daddr_type); 909 struct net_device *dev; 910 911 memset(&hiscore, 0, sizeof(hiscore)); 912 913 read_lock(&dev_base_lock); 914 read_lock(&addrconf_lock); 915 916 for (dev = dev_base; dev; dev=dev->next) { 917 struct inet6_dev *idev; 918 struct inet6_ifaddr *ifa; 919 920 /* Rule 0: Candidate Source Address (section 4) 921 * - multicast and link-local destination address, 922 * the set of candidate source address MUST only 923 * include addresses assigned to interfaces 924 * belonging to the same link as the outgoing 925 * interface. 926 * (- For site-local destination addresses, the 927 * set of candidate source addresses MUST only 928 * include addresses assigned to interfaces 929 * belonging to the same site as the outgoing 930 * interface.) 931 */ 932 if ((daddr_type & IPV6_ADDR_MULTICAST || 933 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 934 daddr_dev && dev != daddr_dev) 935 continue; 936 937 idev = __in6_dev_get(dev); 938 if (!idev) 939 continue; 940 941 read_lock_bh(&idev->lock); 942 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) { 943 struct ipv6_saddr_score score; 944 945 score.addr_type = __ipv6_addr_type(&ifa->addr); 946 947 /* Rule 0: 948 * - Tentative Address (RFC2462 section 5.4) 949 * - A tentative address is not considered 950 * "assigned to an interface" in the traditional 951 * sense. 952 * - Candidate Source Address (section 4) 953 * - In any case, anycast addresses, multicast 954 * addresses, and the unspecified address MUST 955 * NOT be included in a candidate set. 956 */ 957 if (ifa->flags & IFA_F_TENTATIVE) 958 continue; 959 if (unlikely(score.addr_type == IPV6_ADDR_ANY || 960 score.addr_type & IPV6_ADDR_MULTICAST)) { 961 LIMIT_NETDEBUG(KERN_DEBUG 962 "ADDRCONF: unspecified / multicast address" 963 "assigned as unicast address on %s", 964 dev->name); 965 continue; 966 } 967 968 score.attrs = 0; 969 score.matchlen = 0; 970 score.scope = 0; 971 score.rule = 0; 972 973 if (ifa_result == NULL) { 974 /* record it if the first available entry */ 975 goto record_it; 976 } 977 978 /* Rule 1: Prefer same address */ 979 if (hiscore.rule < 1) { 980 if (ipv6_addr_equal(&ifa_result->addr, daddr)) 981 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL; 982 hiscore.rule++; 983 } 984 if (ipv6_addr_equal(&ifa->addr, daddr)) { 985 score.attrs |= IPV6_SADDR_SCORE_LOCAL; 986 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) { 987 score.rule = 1; 988 goto record_it; 989 } 990 } else { 991 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL) 992 continue; 993 } 994 995 /* Rule 2: Prefer appropriate scope */ 996 if (hiscore.rule < 2) { 997 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type); 998 hiscore.rule++; 999 } 1000 score.scope = __ipv6_addr_src_scope(score.addr_type); 1001 if (hiscore.scope < score.scope) { 1002 if (hiscore.scope < daddr_scope) { 1003 score.rule = 2; 1004 goto record_it; 1005 } else 1006 continue; 1007 } else if (score.scope < hiscore.scope) { 1008 if (score.scope < daddr_scope) 1009 break; /* addresses sorted by scope */ 1010 else { 1011 score.rule = 2; 1012 goto record_it; 1013 } 1014 } 1015 1016 /* Rule 3: Avoid deprecated address */ 1017 if (hiscore.rule < 3) { 1018 if (ipv6_saddr_preferred(hiscore.addr_type) || 1019 !(ifa_result->flags & IFA_F_DEPRECATED)) 1020 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED; 1021 hiscore.rule++; 1022 } 1023 if (ipv6_saddr_preferred(score.addr_type) || 1024 !(ifa->flags & IFA_F_DEPRECATED)) { 1025 score.attrs |= IPV6_SADDR_SCORE_PREFERRED; 1026 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) { 1027 score.rule = 3; 1028 goto record_it; 1029 } 1030 } else { 1031 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED) 1032 continue; 1033 } 1034 1035 /* Rule 4: Prefer home address -- not implemented yet */ 1036 if (hiscore.rule < 4) 1037 hiscore.rule++; 1038 1039 /* Rule 5: Prefer outgoing interface */ 1040 if (hiscore.rule < 5) { 1041 if (daddr_dev == NULL || 1042 daddr_dev == ifa_result->idev->dev) 1043 hiscore.attrs |= IPV6_SADDR_SCORE_OIF; 1044 hiscore.rule++; 1045 } 1046 if (daddr_dev == NULL || 1047 daddr_dev == ifa->idev->dev) { 1048 score.attrs |= IPV6_SADDR_SCORE_OIF; 1049 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) { 1050 score.rule = 5; 1051 goto record_it; 1052 } 1053 } else { 1054 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF) 1055 continue; 1056 } 1057 1058 /* Rule 6: Prefer matching label */ 1059 if (hiscore.rule < 6) { 1060 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label) 1061 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL; 1062 hiscore.rule++; 1063 } 1064 if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) { 1065 score.attrs |= IPV6_SADDR_SCORE_LABEL; 1066 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) { 1067 score.rule = 6; 1068 goto record_it; 1069 } 1070 } else { 1071 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL) 1072 continue; 1073 } 1074 1075 #ifdef CONFIG_IPV6_PRIVACY 1076 /* Rule 7: Prefer public address 1077 * Note: prefer temprary address if use_tempaddr >= 2 1078 */ 1079 if (hiscore.rule < 7) { 1080 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^ 1081 (ifa_result->idev->cnf.use_tempaddr >= 2)) 1082 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY; 1083 hiscore.rule++; 1084 } 1085 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^ 1086 (ifa->idev->cnf.use_tempaddr >= 2)) { 1087 score.attrs |= IPV6_SADDR_SCORE_PRIVACY; 1088 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) { 1089 score.rule = 7; 1090 goto record_it; 1091 } 1092 } else { 1093 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY) 1094 continue; 1095 } 1096 #else 1097 if (hiscore.rule < 7) 1098 hiscore.rule++; 1099 #endif 1100 /* Rule 8: Use longest matching prefix */ 1101 if (hiscore.rule < 8) { 1102 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr); 1103 hiscore.rule++; 1104 } 1105 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr); 1106 if (score.matchlen > hiscore.matchlen) { 1107 score.rule = 8; 1108 goto record_it; 1109 } 1110 #if 0 1111 else if (score.matchlen < hiscore.matchlen) 1112 continue; 1113 #endif 1114 1115 /* Final Rule: choose first available one */ 1116 continue; 1117 record_it: 1118 if (ifa_result) 1119 in6_ifa_put(ifa_result); 1120 in6_ifa_hold(ifa); 1121 ifa_result = ifa; 1122 hiscore = score; 1123 } 1124 read_unlock_bh(&idev->lock); 1125 } 1126 read_unlock(&addrconf_lock); 1127 read_unlock(&dev_base_lock); 1128 1129 if (!ifa_result) 1130 return -EADDRNOTAVAIL; 1131 1132 ipv6_addr_copy(saddr, &ifa_result->addr); 1133 in6_ifa_put(ifa_result); 1134 return 0; 1135 } 1136 1137 1138 int ipv6_get_saddr(struct dst_entry *dst, 1139 struct in6_addr *daddr, struct in6_addr *saddr) 1140 { 1141 return ipv6_dev_get_saddr(dst ? ((struct rt6_info *)dst)->rt6i_idev->dev : NULL, daddr, saddr); 1142 } 1143 1144 1145 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr) 1146 { 1147 struct inet6_dev *idev; 1148 int err = -EADDRNOTAVAIL; 1149 1150 read_lock(&addrconf_lock); 1151 if ((idev = __in6_dev_get(dev)) != NULL) { 1152 struct inet6_ifaddr *ifp; 1153 1154 read_lock_bh(&idev->lock); 1155 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1156 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1157 ipv6_addr_copy(addr, &ifp->addr); 1158 err = 0; 1159 break; 1160 } 1161 } 1162 read_unlock_bh(&idev->lock); 1163 } 1164 read_unlock(&addrconf_lock); 1165 return err; 1166 } 1167 1168 static int ipv6_count_addresses(struct inet6_dev *idev) 1169 { 1170 int cnt = 0; 1171 struct inet6_ifaddr *ifp; 1172 1173 read_lock_bh(&idev->lock); 1174 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) 1175 cnt++; 1176 read_unlock_bh(&idev->lock); 1177 return cnt; 1178 } 1179 1180 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict) 1181 { 1182 struct inet6_ifaddr * ifp; 1183 u8 hash = ipv6_addr_hash(addr); 1184 1185 read_lock_bh(&addrconf_hash_lock); 1186 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1187 if (ipv6_addr_equal(&ifp->addr, addr) && 1188 !(ifp->flags&IFA_F_TENTATIVE)) { 1189 if (dev == NULL || ifp->idev->dev == dev || 1190 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) 1191 break; 1192 } 1193 } 1194 read_unlock_bh(&addrconf_hash_lock); 1195 return ifp != NULL; 1196 } 1197 1198 static 1199 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev) 1200 { 1201 struct inet6_ifaddr * ifp; 1202 u8 hash = ipv6_addr_hash(addr); 1203 1204 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1205 if (ipv6_addr_equal(&ifp->addr, addr)) { 1206 if (dev == NULL || ifp->idev->dev == dev) 1207 break; 1208 } 1209 } 1210 return ifp != NULL; 1211 } 1212 1213 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict) 1214 { 1215 struct inet6_ifaddr * ifp; 1216 u8 hash = ipv6_addr_hash(addr); 1217 1218 read_lock_bh(&addrconf_hash_lock); 1219 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { 1220 if (ipv6_addr_equal(&ifp->addr, addr)) { 1221 if (dev == NULL || ifp->idev->dev == dev || 1222 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1223 in6_ifa_hold(ifp); 1224 break; 1225 } 1226 } 1227 } 1228 read_unlock_bh(&addrconf_hash_lock); 1229 1230 return ifp; 1231 } 1232 1233 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2) 1234 { 1235 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr; 1236 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2); 1237 u32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr; 1238 u32 sk2_rcv_saddr = inet_rcv_saddr(sk2); 1239 int sk_ipv6only = ipv6_only_sock(sk); 1240 int sk2_ipv6only = inet_v6_ipv6only(sk2); 1241 int addr_type = ipv6_addr_type(sk_rcv_saddr6); 1242 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED; 1243 1244 if (!sk2_rcv_saddr && !sk_ipv6only) 1245 return 1; 1246 1247 if (addr_type2 == IPV6_ADDR_ANY && 1248 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED)) 1249 return 1; 1250 1251 if (addr_type == IPV6_ADDR_ANY && 1252 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED)) 1253 return 1; 1254 1255 if (sk2_rcv_saddr6 && 1256 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6)) 1257 return 1; 1258 1259 if (addr_type == IPV6_ADDR_MAPPED && 1260 !sk2_ipv6only && 1261 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr)) 1262 return 1; 1263 1264 return 0; 1265 } 1266 1267 /* Gets referenced address, destroys ifaddr */ 1268 1269 static void addrconf_dad_stop(struct inet6_ifaddr *ifp) 1270 { 1271 if (ifp->flags&IFA_F_PERMANENT) { 1272 spin_lock_bh(&ifp->lock); 1273 addrconf_del_timer(ifp); 1274 ifp->flags |= IFA_F_TENTATIVE; 1275 spin_unlock_bh(&ifp->lock); 1276 in6_ifa_put(ifp); 1277 #ifdef CONFIG_IPV6_PRIVACY 1278 } else if (ifp->flags&IFA_F_TEMPORARY) { 1279 struct inet6_ifaddr *ifpub; 1280 spin_lock_bh(&ifp->lock); 1281 ifpub = ifp->ifpub; 1282 if (ifpub) { 1283 in6_ifa_hold(ifpub); 1284 spin_unlock_bh(&ifp->lock); 1285 ipv6_create_tempaddr(ifpub, ifp); 1286 in6_ifa_put(ifpub); 1287 } else { 1288 spin_unlock_bh(&ifp->lock); 1289 } 1290 ipv6_del_addr(ifp); 1291 #endif 1292 } else 1293 ipv6_del_addr(ifp); 1294 } 1295 1296 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1297 { 1298 if (net_ratelimit()) 1299 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name); 1300 addrconf_dad_stop(ifp); 1301 } 1302 1303 /* Join to solicited addr multicast group. */ 1304 1305 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr) 1306 { 1307 struct in6_addr maddr; 1308 1309 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1310 return; 1311 1312 addrconf_addr_solict_mult(addr, &maddr); 1313 ipv6_dev_mc_inc(dev, &maddr); 1314 } 1315 1316 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr) 1317 { 1318 struct in6_addr maddr; 1319 1320 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1321 return; 1322 1323 addrconf_addr_solict_mult(addr, &maddr); 1324 __ipv6_dev_mc_dec(idev, &maddr); 1325 } 1326 1327 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1328 { 1329 struct in6_addr addr; 1330 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1331 if (ipv6_addr_any(&addr)) 1332 return; 1333 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1334 } 1335 1336 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1337 { 1338 struct in6_addr addr; 1339 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1340 if (ipv6_addr_any(&addr)) 1341 return; 1342 __ipv6_dev_ac_dec(ifp->idev, &addr); 1343 } 1344 1345 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1346 { 1347 if (dev->addr_len != ETH_ALEN) 1348 return -1; 1349 memcpy(eui, dev->dev_addr, 3); 1350 memcpy(eui + 5, dev->dev_addr + 3, 3); 1351 1352 /* 1353 * The zSeries OSA network cards can be shared among various 1354 * OS instances, but the OSA cards have only one MAC address. 1355 * This leads to duplicate address conflicts in conjunction 1356 * with IPv6 if more than one instance uses the same card. 1357 * 1358 * The driver for these cards can deliver a unique 16-bit 1359 * identifier for each instance sharing the same card. It is 1360 * placed instead of 0xFFFE in the interface identifier. The 1361 * "u" bit of the interface identifier is not inverted in this 1362 * case. Hence the resulting interface identifier has local 1363 * scope according to RFC2373. 1364 */ 1365 if (dev->dev_id) { 1366 eui[3] = (dev->dev_id >> 8) & 0xFF; 1367 eui[4] = dev->dev_id & 0xFF; 1368 } else { 1369 eui[3] = 0xFF; 1370 eui[4] = 0xFE; 1371 eui[0] ^= 2; 1372 } 1373 return 0; 1374 } 1375 1376 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1377 { 1378 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1379 if (dev->addr_len != ARCNET_ALEN) 1380 return -1; 1381 memset(eui, 0, 7); 1382 eui[7] = *(u8*)dev->dev_addr; 1383 return 0; 1384 } 1385 1386 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1387 { 1388 if (dev->addr_len != INFINIBAND_ALEN) 1389 return -1; 1390 memcpy(eui, dev->dev_addr + 12, 8); 1391 eui[0] |= 2; 1392 return 0; 1393 } 1394 1395 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1396 { 1397 switch (dev->type) { 1398 case ARPHRD_ETHER: 1399 case ARPHRD_FDDI: 1400 case ARPHRD_IEEE802_TR: 1401 return addrconf_ifid_eui48(eui, dev); 1402 case ARPHRD_ARCNET: 1403 return addrconf_ifid_arcnet(eui, dev); 1404 case ARPHRD_INFINIBAND: 1405 return addrconf_ifid_infiniband(eui, dev); 1406 } 1407 return -1; 1408 } 1409 1410 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1411 { 1412 int err = -1; 1413 struct inet6_ifaddr *ifp; 1414 1415 read_lock_bh(&idev->lock); 1416 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { 1417 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1418 memcpy(eui, ifp->addr.s6_addr+8, 8); 1419 err = 0; 1420 break; 1421 } 1422 } 1423 read_unlock_bh(&idev->lock); 1424 return err; 1425 } 1426 1427 #ifdef CONFIG_IPV6_PRIVACY 1428 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1429 static int __ipv6_regen_rndid(struct inet6_dev *idev) 1430 { 1431 regen: 1432 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1433 idev->rndid[0] &= ~0x02; 1434 1435 /* 1436 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1437 * check if generated address is not inappropriate 1438 * 1439 * - Reserved subnet anycast (RFC 2526) 1440 * 11111101 11....11 1xxxxxxx 1441 * - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1 1442 * 00-00-5E-FE-xx-xx-xx-xx 1443 * - value 0 1444 * - XXX: already assigned to an address on the device 1445 */ 1446 if (idev->rndid[0] == 0xfd && 1447 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1448 (idev->rndid[7]&0x80)) 1449 goto regen; 1450 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1451 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1452 goto regen; 1453 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1454 goto regen; 1455 } 1456 1457 return 0; 1458 } 1459 1460 static void ipv6_regen_rndid(unsigned long data) 1461 { 1462 struct inet6_dev *idev = (struct inet6_dev *) data; 1463 unsigned long expires; 1464 1465 read_lock_bh(&addrconf_lock); 1466 write_lock_bh(&idev->lock); 1467 1468 if (idev->dead) 1469 goto out; 1470 1471 if (__ipv6_regen_rndid(idev) < 0) 1472 goto out; 1473 1474 expires = jiffies + 1475 idev->cnf.temp_prefered_lft * HZ - 1476 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor; 1477 if (time_before(expires, jiffies)) { 1478 printk(KERN_WARNING 1479 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n", 1480 idev->dev->name); 1481 goto out; 1482 } 1483 1484 if (!mod_timer(&idev->regen_timer, expires)) 1485 in6_dev_hold(idev); 1486 1487 out: 1488 write_unlock_bh(&idev->lock); 1489 read_unlock_bh(&addrconf_lock); 1490 in6_dev_put(idev); 1491 } 1492 1493 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) { 1494 int ret = 0; 1495 1496 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1497 ret = __ipv6_regen_rndid(idev); 1498 return ret; 1499 } 1500 #endif 1501 1502 /* 1503 * Add prefix route. 1504 */ 1505 1506 static void 1507 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1508 unsigned long expires, u32 flags) 1509 { 1510 struct in6_rtmsg rtmsg; 1511 1512 memset(&rtmsg, 0, sizeof(rtmsg)); 1513 ipv6_addr_copy(&rtmsg.rtmsg_dst, pfx); 1514 rtmsg.rtmsg_dst_len = plen; 1515 rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF; 1516 rtmsg.rtmsg_ifindex = dev->ifindex; 1517 rtmsg.rtmsg_info = expires; 1518 rtmsg.rtmsg_flags = RTF_UP|flags; 1519 rtmsg.rtmsg_type = RTMSG_NEWROUTE; 1520 1521 /* Prevent useless cloning on PtP SIT. 1522 This thing is done here expecting that the whole 1523 class of non-broadcast devices need not cloning. 1524 */ 1525 if (dev->type == ARPHRD_SIT && (dev->flags&IFF_POINTOPOINT)) 1526 rtmsg.rtmsg_flags |= RTF_NONEXTHOP; 1527 1528 ip6_route_add(&rtmsg, NULL, NULL, NULL); 1529 } 1530 1531 /* Create "default" multicast route to the interface */ 1532 1533 static void addrconf_add_mroute(struct net_device *dev) 1534 { 1535 struct in6_rtmsg rtmsg; 1536 1537 memset(&rtmsg, 0, sizeof(rtmsg)); 1538 ipv6_addr_set(&rtmsg.rtmsg_dst, 1539 htonl(0xFF000000), 0, 0, 0); 1540 rtmsg.rtmsg_dst_len = 8; 1541 rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF; 1542 rtmsg.rtmsg_ifindex = dev->ifindex; 1543 rtmsg.rtmsg_flags = RTF_UP; 1544 rtmsg.rtmsg_type = RTMSG_NEWROUTE; 1545 ip6_route_add(&rtmsg, NULL, NULL, NULL); 1546 } 1547 1548 static void sit_route_add(struct net_device *dev) 1549 { 1550 struct in6_rtmsg rtmsg; 1551 1552 memset(&rtmsg, 0, sizeof(rtmsg)); 1553 1554 rtmsg.rtmsg_type = RTMSG_NEWROUTE; 1555 rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF; 1556 1557 /* prefix length - 96 bits "::d.d.d.d" */ 1558 rtmsg.rtmsg_dst_len = 96; 1559 rtmsg.rtmsg_flags = RTF_UP|RTF_NONEXTHOP; 1560 rtmsg.rtmsg_ifindex = dev->ifindex; 1561 1562 ip6_route_add(&rtmsg, NULL, NULL, NULL); 1563 } 1564 1565 static void addrconf_add_lroute(struct net_device *dev) 1566 { 1567 struct in6_addr addr; 1568 1569 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 1570 addrconf_prefix_route(&addr, 64, dev, 0, 0); 1571 } 1572 1573 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 1574 { 1575 struct inet6_dev *idev; 1576 1577 ASSERT_RTNL(); 1578 1579 if ((idev = ipv6_find_idev(dev)) == NULL) 1580 return NULL; 1581 1582 /* Add default multicast route */ 1583 addrconf_add_mroute(dev); 1584 1585 /* Add link local route */ 1586 addrconf_add_lroute(dev); 1587 return idev; 1588 } 1589 1590 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len) 1591 { 1592 struct prefix_info *pinfo; 1593 __u32 valid_lft; 1594 __u32 prefered_lft; 1595 int addr_type; 1596 unsigned long rt_expires; 1597 struct inet6_dev *in6_dev; 1598 1599 pinfo = (struct prefix_info *) opt; 1600 1601 if (len < sizeof(struct prefix_info)) { 1602 ADBG(("addrconf: prefix option too short\n")); 1603 return; 1604 } 1605 1606 /* 1607 * Validation checks ([ADDRCONF], page 19) 1608 */ 1609 1610 addr_type = ipv6_addr_type(&pinfo->prefix); 1611 1612 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 1613 return; 1614 1615 valid_lft = ntohl(pinfo->valid); 1616 prefered_lft = ntohl(pinfo->prefered); 1617 1618 if (prefered_lft > valid_lft) { 1619 if (net_ratelimit()) 1620 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n"); 1621 return; 1622 } 1623 1624 in6_dev = in6_dev_get(dev); 1625 1626 if (in6_dev == NULL) { 1627 if (net_ratelimit()) 1628 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name); 1629 return; 1630 } 1631 1632 /* 1633 * Two things going on here: 1634 * 1) Add routes for on-link prefixes 1635 * 2) Configure prefixes with the auto flag set 1636 */ 1637 1638 /* Avoid arithmetic overflow. Really, we could 1639 save rt_expires in seconds, likely valid_lft, 1640 but it would require division in fib gc, that it 1641 not good. 1642 */ 1643 if (valid_lft >= 0x7FFFFFFF/HZ) 1644 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ); 1645 else 1646 rt_expires = valid_lft * HZ; 1647 1648 /* 1649 * We convert this (in jiffies) to clock_t later. 1650 * Avoid arithmetic overflow there as well. 1651 * Overflow can happen only if HZ < USER_HZ. 1652 */ 1653 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ) 1654 rt_expires = 0x7FFFFFFF / USER_HZ; 1655 1656 if (pinfo->onlink) { 1657 struct rt6_info *rt; 1658 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1); 1659 1660 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) { 1661 if (rt->rt6i_flags&RTF_EXPIRES) { 1662 if (valid_lft == 0) { 1663 ip6_del_rt(rt, NULL, NULL, NULL); 1664 rt = NULL; 1665 } else { 1666 rt->rt6i_expires = jiffies + rt_expires; 1667 } 1668 } 1669 } else if (valid_lft) { 1670 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 1671 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT); 1672 } 1673 if (rt) 1674 dst_release(&rt->u.dst); 1675 } 1676 1677 /* Try to figure out our local address for this prefix */ 1678 1679 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 1680 struct inet6_ifaddr * ifp; 1681 struct in6_addr addr; 1682 int create = 0, update_lft = 0; 1683 1684 if (pinfo->prefix_len == 64) { 1685 memcpy(&addr, &pinfo->prefix, 8); 1686 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 1687 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 1688 in6_dev_put(in6_dev); 1689 return; 1690 } 1691 goto ok; 1692 } 1693 if (net_ratelimit()) 1694 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n", 1695 pinfo->prefix_len); 1696 in6_dev_put(in6_dev); 1697 return; 1698 1699 ok: 1700 1701 ifp = ipv6_get_ifaddr(&addr, dev, 1); 1702 1703 if (ifp == NULL && valid_lft) { 1704 int max_addresses = in6_dev->cnf.max_addresses; 1705 1706 /* Do not allow to create too much of autoconfigured 1707 * addresses; this would be too easy way to crash kernel. 1708 */ 1709 if (!max_addresses || 1710 ipv6_count_addresses(in6_dev) < max_addresses) 1711 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 1712 addr_type&IPV6_ADDR_SCOPE_MASK, 0); 1713 1714 if (!ifp || IS_ERR(ifp)) { 1715 in6_dev_put(in6_dev); 1716 return; 1717 } 1718 1719 update_lft = create = 1; 1720 ifp->cstamp = jiffies; 1721 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT); 1722 } 1723 1724 if (ifp) { 1725 int flags; 1726 unsigned long now; 1727 #ifdef CONFIG_IPV6_PRIVACY 1728 struct inet6_ifaddr *ift; 1729 #endif 1730 u32 stored_lft; 1731 1732 /* update lifetime (RFC2462 5.5.3 e) */ 1733 spin_lock(&ifp->lock); 1734 now = jiffies; 1735 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 1736 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 1737 else 1738 stored_lft = 0; 1739 if (!update_lft && stored_lft) { 1740 if (valid_lft > MIN_VALID_LIFETIME || 1741 valid_lft > stored_lft) 1742 update_lft = 1; 1743 else if (stored_lft <= MIN_VALID_LIFETIME) { 1744 /* valid_lft <= stored_lft is always true */ 1745 /* XXX: IPsec */ 1746 update_lft = 0; 1747 } else { 1748 valid_lft = MIN_VALID_LIFETIME; 1749 if (valid_lft < prefered_lft) 1750 prefered_lft = valid_lft; 1751 update_lft = 1; 1752 } 1753 } 1754 1755 if (update_lft) { 1756 ifp->valid_lft = valid_lft; 1757 ifp->prefered_lft = prefered_lft; 1758 ifp->tstamp = now; 1759 flags = ifp->flags; 1760 ifp->flags &= ~IFA_F_DEPRECATED; 1761 spin_unlock(&ifp->lock); 1762 1763 if (!(flags&IFA_F_TENTATIVE)) 1764 ipv6_ifa_notify(0, ifp); 1765 } else 1766 spin_unlock(&ifp->lock); 1767 1768 #ifdef CONFIG_IPV6_PRIVACY 1769 read_lock_bh(&in6_dev->lock); 1770 /* update all temporary addresses in the list */ 1771 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) { 1772 /* 1773 * When adjusting the lifetimes of an existing 1774 * temporary address, only lower the lifetimes. 1775 * Implementations must not increase the 1776 * lifetimes of an existing temporary address 1777 * when processing a Prefix Information Option. 1778 */ 1779 spin_lock(&ift->lock); 1780 flags = ift->flags; 1781 if (ift->valid_lft > valid_lft && 1782 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ) 1783 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ; 1784 if (ift->prefered_lft > prefered_lft && 1785 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ) 1786 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ; 1787 spin_unlock(&ift->lock); 1788 if (!(flags&IFA_F_TENTATIVE)) 1789 ipv6_ifa_notify(0, ift); 1790 } 1791 1792 if (create && in6_dev->cnf.use_tempaddr > 0) { 1793 /* 1794 * When a new public address is created as described in [ADDRCONF], 1795 * also create a new temporary address. 1796 */ 1797 read_unlock_bh(&in6_dev->lock); 1798 ipv6_create_tempaddr(ifp, NULL); 1799 } else { 1800 read_unlock_bh(&in6_dev->lock); 1801 } 1802 #endif 1803 in6_ifa_put(ifp); 1804 addrconf_verify(0); 1805 } 1806 } 1807 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 1808 in6_dev_put(in6_dev); 1809 } 1810 1811 /* 1812 * Set destination address. 1813 * Special case for SIT interfaces where we create a new "virtual" 1814 * device. 1815 */ 1816 int addrconf_set_dstaddr(void __user *arg) 1817 { 1818 struct in6_ifreq ireq; 1819 struct net_device *dev; 1820 int err = -EINVAL; 1821 1822 rtnl_lock(); 1823 1824 err = -EFAULT; 1825 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 1826 goto err_exit; 1827 1828 dev = __dev_get_by_index(ireq.ifr6_ifindex); 1829 1830 err = -ENODEV; 1831 if (dev == NULL) 1832 goto err_exit; 1833 1834 if (dev->type == ARPHRD_SIT) { 1835 struct ifreq ifr; 1836 mm_segment_t oldfs; 1837 struct ip_tunnel_parm p; 1838 1839 err = -EADDRNOTAVAIL; 1840 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 1841 goto err_exit; 1842 1843 memset(&p, 0, sizeof(p)); 1844 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 1845 p.iph.saddr = 0; 1846 p.iph.version = 4; 1847 p.iph.ihl = 5; 1848 p.iph.protocol = IPPROTO_IPV6; 1849 p.iph.ttl = 64; 1850 ifr.ifr_ifru.ifru_data = (void __user *)&p; 1851 1852 oldfs = get_fs(); set_fs(KERNEL_DS); 1853 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL); 1854 set_fs(oldfs); 1855 1856 if (err == 0) { 1857 err = -ENOBUFS; 1858 if ((dev = __dev_get_by_name(p.name)) == NULL) 1859 goto err_exit; 1860 err = dev_open(dev); 1861 } 1862 } 1863 1864 err_exit: 1865 rtnl_unlock(); 1866 return err; 1867 } 1868 1869 /* 1870 * Manual configuration of address on an interface 1871 */ 1872 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen, 1873 __u32 prefered_lft, __u32 valid_lft) 1874 { 1875 struct inet6_ifaddr *ifp; 1876 struct inet6_dev *idev; 1877 struct net_device *dev; 1878 __u8 ifa_flags = 0; 1879 int scope; 1880 1881 ASSERT_RTNL(); 1882 1883 /* check the lifetime */ 1884 if (!valid_lft || prefered_lft > valid_lft) 1885 return -EINVAL; 1886 1887 if ((dev = __dev_get_by_index(ifindex)) == NULL) 1888 return -ENODEV; 1889 1890 if (!(dev->flags&IFF_UP)) 1891 return -ENETDOWN; 1892 1893 if ((idev = addrconf_add_dev(dev)) == NULL) 1894 return -ENOBUFS; 1895 1896 scope = ipv6_addr_scope(pfx); 1897 1898 if (valid_lft == INFINITY_LIFE_TIME) 1899 ifa_flags |= IFA_F_PERMANENT; 1900 else if (valid_lft >= 0x7FFFFFFF/HZ) 1901 valid_lft = 0x7FFFFFFF/HZ; 1902 1903 if (prefered_lft == 0) 1904 ifa_flags |= IFA_F_DEPRECATED; 1905 else if ((prefered_lft >= 0x7FFFFFFF/HZ) && 1906 (prefered_lft != INFINITY_LIFE_TIME)) 1907 prefered_lft = 0x7FFFFFFF/HZ; 1908 1909 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 1910 1911 if (!IS_ERR(ifp)) { 1912 spin_lock_bh(&ifp->lock); 1913 ifp->valid_lft = valid_lft; 1914 ifp->prefered_lft = prefered_lft; 1915 ifp->tstamp = jiffies; 1916 spin_unlock_bh(&ifp->lock); 1917 1918 addrconf_dad_start(ifp, 0); 1919 in6_ifa_put(ifp); 1920 addrconf_verify(0); 1921 return 0; 1922 } 1923 1924 return PTR_ERR(ifp); 1925 } 1926 1927 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen) 1928 { 1929 struct inet6_ifaddr *ifp; 1930 struct inet6_dev *idev; 1931 struct net_device *dev; 1932 1933 if ((dev = __dev_get_by_index(ifindex)) == NULL) 1934 return -ENODEV; 1935 1936 if ((idev = __in6_dev_get(dev)) == NULL) 1937 return -ENXIO; 1938 1939 read_lock_bh(&idev->lock); 1940 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) { 1941 if (ifp->prefix_len == plen && 1942 ipv6_addr_equal(pfx, &ifp->addr)) { 1943 in6_ifa_hold(ifp); 1944 read_unlock_bh(&idev->lock); 1945 1946 ipv6_del_addr(ifp); 1947 1948 /* If the last address is deleted administratively, 1949 disable IPv6 on this interface. 1950 */ 1951 if (idev->addr_list == NULL) 1952 addrconf_ifdown(idev->dev, 1); 1953 return 0; 1954 } 1955 } 1956 read_unlock_bh(&idev->lock); 1957 return -EADDRNOTAVAIL; 1958 } 1959 1960 1961 int addrconf_add_ifaddr(void __user *arg) 1962 { 1963 struct in6_ifreq ireq; 1964 int err; 1965 1966 if (!capable(CAP_NET_ADMIN)) 1967 return -EPERM; 1968 1969 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 1970 return -EFAULT; 1971 1972 rtnl_lock(); 1973 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen, 1974 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 1975 rtnl_unlock(); 1976 return err; 1977 } 1978 1979 int addrconf_del_ifaddr(void __user *arg) 1980 { 1981 struct in6_ifreq ireq; 1982 int err; 1983 1984 if (!capable(CAP_NET_ADMIN)) 1985 return -EPERM; 1986 1987 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 1988 return -EFAULT; 1989 1990 rtnl_lock(); 1991 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen); 1992 rtnl_unlock(); 1993 return err; 1994 } 1995 1996 static void sit_add_v4_addrs(struct inet6_dev *idev) 1997 { 1998 struct inet6_ifaddr * ifp; 1999 struct in6_addr addr; 2000 struct net_device *dev; 2001 int scope; 2002 2003 ASSERT_RTNL(); 2004 2005 memset(&addr, 0, sizeof(struct in6_addr)); 2006 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2007 2008 if (idev->dev->flags&IFF_POINTOPOINT) { 2009 addr.s6_addr32[0] = htonl(0xfe800000); 2010 scope = IFA_LINK; 2011 } else { 2012 scope = IPV6_ADDR_COMPATv4; 2013 } 2014 2015 if (addr.s6_addr32[3]) { 2016 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT); 2017 if (!IS_ERR(ifp)) { 2018 spin_lock_bh(&ifp->lock); 2019 ifp->flags &= ~IFA_F_TENTATIVE; 2020 spin_unlock_bh(&ifp->lock); 2021 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2022 in6_ifa_put(ifp); 2023 } 2024 return; 2025 } 2026 2027 for (dev = dev_base; dev != NULL; dev = dev->next) { 2028 struct in_device * in_dev = __in_dev_get_rtnl(dev); 2029 if (in_dev && (dev->flags & IFF_UP)) { 2030 struct in_ifaddr * ifa; 2031 2032 int flag = scope; 2033 2034 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2035 int plen; 2036 2037 addr.s6_addr32[3] = ifa->ifa_local; 2038 2039 if (ifa->ifa_scope == RT_SCOPE_LINK) 2040 continue; 2041 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2042 if (idev->dev->flags&IFF_POINTOPOINT) 2043 continue; 2044 flag |= IFA_HOST; 2045 } 2046 if (idev->dev->flags&IFF_POINTOPOINT) 2047 plen = 64; 2048 else 2049 plen = 96; 2050 2051 ifp = ipv6_add_addr(idev, &addr, plen, flag, 2052 IFA_F_PERMANENT); 2053 if (!IS_ERR(ifp)) { 2054 spin_lock_bh(&ifp->lock); 2055 ifp->flags &= ~IFA_F_TENTATIVE; 2056 spin_unlock_bh(&ifp->lock); 2057 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2058 in6_ifa_put(ifp); 2059 } 2060 } 2061 } 2062 } 2063 } 2064 2065 static void init_loopback(struct net_device *dev) 2066 { 2067 struct inet6_dev *idev; 2068 struct inet6_ifaddr * ifp; 2069 2070 /* ::1 */ 2071 2072 ASSERT_RTNL(); 2073 2074 if ((idev = ipv6_find_idev(dev)) == NULL) { 2075 printk(KERN_DEBUG "init loopback: add_dev failed\n"); 2076 return; 2077 } 2078 2079 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT); 2080 if (!IS_ERR(ifp)) { 2081 spin_lock_bh(&ifp->lock); 2082 ifp->flags &= ~IFA_F_TENTATIVE; 2083 spin_unlock_bh(&ifp->lock); 2084 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2085 in6_ifa_put(ifp); 2086 } 2087 } 2088 2089 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr) 2090 { 2091 struct inet6_ifaddr * ifp; 2092 2093 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT); 2094 if (!IS_ERR(ifp)) { 2095 addrconf_dad_start(ifp, 0); 2096 in6_ifa_put(ifp); 2097 } 2098 } 2099 2100 static void addrconf_dev_config(struct net_device *dev) 2101 { 2102 struct in6_addr addr; 2103 struct inet6_dev * idev; 2104 2105 ASSERT_RTNL(); 2106 2107 if ((dev->type != ARPHRD_ETHER) && 2108 (dev->type != ARPHRD_FDDI) && 2109 (dev->type != ARPHRD_IEEE802_TR) && 2110 (dev->type != ARPHRD_ARCNET) && 2111 (dev->type != ARPHRD_INFINIBAND)) { 2112 /* Alas, we support only Ethernet autoconfiguration. */ 2113 return; 2114 } 2115 2116 idev = addrconf_add_dev(dev); 2117 if (idev == NULL) 2118 return; 2119 2120 memset(&addr, 0, sizeof(struct in6_addr)); 2121 addr.s6_addr32[0] = htonl(0xFE800000); 2122 2123 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2124 addrconf_add_linklocal(idev, &addr); 2125 } 2126 2127 static void addrconf_sit_config(struct net_device *dev) 2128 { 2129 struct inet6_dev *idev; 2130 2131 ASSERT_RTNL(); 2132 2133 /* 2134 * Configure the tunnel with one of our IPv4 2135 * addresses... we should configure all of 2136 * our v4 addrs in the tunnel 2137 */ 2138 2139 if ((idev = ipv6_find_idev(dev)) == NULL) { 2140 printk(KERN_DEBUG "init sit: add_dev failed\n"); 2141 return; 2142 } 2143 2144 sit_add_v4_addrs(idev); 2145 2146 if (dev->flags&IFF_POINTOPOINT) { 2147 addrconf_add_mroute(dev); 2148 addrconf_add_lroute(dev); 2149 } else 2150 sit_route_add(dev); 2151 } 2152 2153 static inline int 2154 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2155 { 2156 struct in6_addr lladdr; 2157 2158 if (!ipv6_get_lladdr(link_dev, &lladdr)) { 2159 addrconf_add_linklocal(idev, &lladdr); 2160 return 0; 2161 } 2162 return -1; 2163 } 2164 2165 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2166 { 2167 struct net_device *link_dev; 2168 2169 /* first try to inherit the link-local address from the link device */ 2170 if (idev->dev->iflink && 2171 (link_dev = __dev_get_by_index(idev->dev->iflink))) { 2172 if (!ipv6_inherit_linklocal(idev, link_dev)) 2173 return; 2174 } 2175 /* then try to inherit it from any device */ 2176 for (link_dev = dev_base; link_dev; link_dev = link_dev->next) { 2177 if (!ipv6_inherit_linklocal(idev, link_dev)) 2178 return; 2179 } 2180 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n"); 2181 } 2182 2183 /* 2184 * Autoconfigure tunnel with a link-local address so routing protocols, 2185 * DHCPv6, MLD etc. can be run over the virtual link 2186 */ 2187 2188 static void addrconf_ip6_tnl_config(struct net_device *dev) 2189 { 2190 struct inet6_dev *idev; 2191 2192 ASSERT_RTNL(); 2193 2194 if ((idev = addrconf_add_dev(dev)) == NULL) { 2195 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n"); 2196 return; 2197 } 2198 ip6_tnl_add_linklocal(idev); 2199 } 2200 2201 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2202 void * data) 2203 { 2204 struct net_device *dev = (struct net_device *) data; 2205 struct inet6_dev *idev = __in6_dev_get(dev); 2206 int run_pending = 0; 2207 2208 switch(event) { 2209 case NETDEV_UP: 2210 case NETDEV_CHANGE: 2211 if (event == NETDEV_UP) { 2212 if (!netif_carrier_ok(dev)) { 2213 /* device is not ready yet. */ 2214 printk(KERN_INFO 2215 "ADDRCONF(NETDEV_UP): %s: " 2216 "link is not ready\n", 2217 dev->name); 2218 break; 2219 } 2220 2221 if (idev) 2222 idev->if_flags |= IF_READY; 2223 } else { 2224 if (!netif_carrier_ok(dev)) { 2225 /* device is still not ready. */ 2226 break; 2227 } 2228 2229 if (idev) { 2230 if (idev->if_flags & IF_READY) { 2231 /* device is already configured. */ 2232 break; 2233 } 2234 idev->if_flags |= IF_READY; 2235 } 2236 2237 printk(KERN_INFO 2238 "ADDRCONF(NETDEV_CHANGE): %s: " 2239 "link becomes ready\n", 2240 dev->name); 2241 2242 run_pending = 1; 2243 } 2244 2245 switch(dev->type) { 2246 case ARPHRD_SIT: 2247 addrconf_sit_config(dev); 2248 break; 2249 case ARPHRD_TUNNEL6: 2250 addrconf_ip6_tnl_config(dev); 2251 break; 2252 case ARPHRD_LOOPBACK: 2253 init_loopback(dev); 2254 break; 2255 2256 default: 2257 addrconf_dev_config(dev); 2258 break; 2259 }; 2260 if (idev) { 2261 if (run_pending) 2262 addrconf_dad_run(idev); 2263 2264 /* If the MTU changed during the interface down, when the 2265 interface up, the changed MTU must be reflected in the 2266 idev as well as routers. 2267 */ 2268 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) { 2269 rt6_mtu_change(dev, dev->mtu); 2270 idev->cnf.mtu6 = dev->mtu; 2271 } 2272 idev->tstamp = jiffies; 2273 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2274 /* If the changed mtu during down is lower than IPV6_MIN_MTU 2275 stop IPv6 on this interface. 2276 */ 2277 if (dev->mtu < IPV6_MIN_MTU) 2278 addrconf_ifdown(dev, event != NETDEV_DOWN); 2279 } 2280 break; 2281 2282 case NETDEV_CHANGEMTU: 2283 if ( idev && dev->mtu >= IPV6_MIN_MTU) { 2284 rt6_mtu_change(dev, dev->mtu); 2285 idev->cnf.mtu6 = dev->mtu; 2286 break; 2287 } 2288 2289 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */ 2290 2291 case NETDEV_DOWN: 2292 case NETDEV_UNREGISTER: 2293 /* 2294 * Remove all addresses from this interface. 2295 */ 2296 addrconf_ifdown(dev, event != NETDEV_DOWN); 2297 break; 2298 2299 case NETDEV_CHANGENAME: 2300 #ifdef CONFIG_SYSCTL 2301 if (idev) { 2302 addrconf_sysctl_unregister(&idev->cnf); 2303 neigh_sysctl_unregister(idev->nd_parms); 2304 neigh_sysctl_register(dev, idev->nd_parms, 2305 NET_IPV6, NET_IPV6_NEIGH, "ipv6", 2306 &ndisc_ifinfo_sysctl_change, 2307 NULL); 2308 addrconf_sysctl_register(idev, &idev->cnf); 2309 } 2310 #endif 2311 break; 2312 }; 2313 2314 return NOTIFY_OK; 2315 } 2316 2317 /* 2318 * addrconf module should be notified of a device going up 2319 */ 2320 static struct notifier_block ipv6_dev_notf = { 2321 .notifier_call = addrconf_notify, 2322 .priority = 0 2323 }; 2324 2325 static int addrconf_ifdown(struct net_device *dev, int how) 2326 { 2327 struct inet6_dev *idev; 2328 struct inet6_ifaddr *ifa, **bifa; 2329 int i; 2330 2331 ASSERT_RTNL(); 2332 2333 if (dev == &loopback_dev && how == 1) 2334 how = 0; 2335 2336 rt6_ifdown(dev); 2337 neigh_ifdown(&nd_tbl, dev); 2338 2339 idev = __in6_dev_get(dev); 2340 if (idev == NULL) 2341 return -ENODEV; 2342 2343 /* Step 1: remove reference to ipv6 device from parent device. 2344 Do not dev_put! 2345 */ 2346 if (how == 1) { 2347 write_lock_bh(&addrconf_lock); 2348 dev->ip6_ptr = NULL; 2349 idev->dead = 1; 2350 write_unlock_bh(&addrconf_lock); 2351 2352 /* Step 1.5: remove snmp6 entry */ 2353 snmp6_unregister_dev(idev); 2354 2355 } 2356 2357 /* Step 2: clear hash table */ 2358 for (i=0; i<IN6_ADDR_HSIZE; i++) { 2359 bifa = &inet6_addr_lst[i]; 2360 2361 write_lock_bh(&addrconf_hash_lock); 2362 while ((ifa = *bifa) != NULL) { 2363 if (ifa->idev == idev) { 2364 *bifa = ifa->lst_next; 2365 ifa->lst_next = NULL; 2366 addrconf_del_timer(ifa); 2367 in6_ifa_put(ifa); 2368 continue; 2369 } 2370 bifa = &ifa->lst_next; 2371 } 2372 write_unlock_bh(&addrconf_hash_lock); 2373 } 2374 2375 write_lock_bh(&idev->lock); 2376 2377 /* Step 3: clear flags for stateless addrconf */ 2378 if (how != 1) 2379 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 2380 2381 /* Step 4: clear address list */ 2382 #ifdef CONFIG_IPV6_PRIVACY 2383 if (how == 1 && del_timer(&idev->regen_timer)) 2384 in6_dev_put(idev); 2385 2386 /* clear tempaddr list */ 2387 while ((ifa = idev->tempaddr_list) != NULL) { 2388 idev->tempaddr_list = ifa->tmp_next; 2389 ifa->tmp_next = NULL; 2390 ifa->dead = 1; 2391 write_unlock_bh(&idev->lock); 2392 spin_lock_bh(&ifa->lock); 2393 2394 if (ifa->ifpub) { 2395 in6_ifa_put(ifa->ifpub); 2396 ifa->ifpub = NULL; 2397 } 2398 spin_unlock_bh(&ifa->lock); 2399 in6_ifa_put(ifa); 2400 write_lock_bh(&idev->lock); 2401 } 2402 #endif 2403 while ((ifa = idev->addr_list) != NULL) { 2404 idev->addr_list = ifa->if_next; 2405 ifa->if_next = NULL; 2406 ifa->dead = 1; 2407 addrconf_del_timer(ifa); 2408 write_unlock_bh(&idev->lock); 2409 2410 __ipv6_ifa_notify(RTM_DELADDR, ifa); 2411 in6_ifa_put(ifa); 2412 2413 write_lock_bh(&idev->lock); 2414 } 2415 write_unlock_bh(&idev->lock); 2416 2417 /* Step 5: Discard multicast list */ 2418 2419 if (how == 1) 2420 ipv6_mc_destroy_dev(idev); 2421 else 2422 ipv6_mc_down(idev); 2423 2424 /* Step 5: netlink notification of this interface */ 2425 idev->tstamp = jiffies; 2426 inet6_ifinfo_notify(RTM_DELLINK, idev); 2427 2428 /* Shot the device (if unregistered) */ 2429 2430 if (how == 1) { 2431 #ifdef CONFIG_SYSCTL 2432 addrconf_sysctl_unregister(&idev->cnf); 2433 neigh_sysctl_unregister(idev->nd_parms); 2434 #endif 2435 neigh_parms_release(&nd_tbl, idev->nd_parms); 2436 neigh_ifdown(&nd_tbl, dev); 2437 in6_dev_put(idev); 2438 } 2439 return 0; 2440 } 2441 2442 static void addrconf_rs_timer(unsigned long data) 2443 { 2444 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2445 2446 if (ifp->idev->cnf.forwarding) 2447 goto out; 2448 2449 if (ifp->idev->if_flags & IF_RA_RCVD) { 2450 /* 2451 * Announcement received after solicitation 2452 * was sent 2453 */ 2454 goto out; 2455 } 2456 2457 spin_lock(&ifp->lock); 2458 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) { 2459 struct in6_addr all_routers; 2460 2461 /* The wait after the last probe can be shorter */ 2462 addrconf_mod_timer(ifp, AC_RS, 2463 (ifp->probes == ifp->idev->cnf.rtr_solicits) ? 2464 ifp->idev->cnf.rtr_solicit_delay : 2465 ifp->idev->cnf.rtr_solicit_interval); 2466 spin_unlock(&ifp->lock); 2467 2468 ipv6_addr_all_routers(&all_routers); 2469 2470 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers); 2471 } else { 2472 spin_unlock(&ifp->lock); 2473 /* 2474 * Note: we do not support deprecated "all on-link" 2475 * assumption any longer. 2476 */ 2477 printk(KERN_DEBUG "%s: no IPv6 routers present\n", 2478 ifp->idev->dev->name); 2479 } 2480 2481 out: 2482 in6_ifa_put(ifp); 2483 } 2484 2485 /* 2486 * Duplicate Address Detection 2487 */ 2488 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 2489 { 2490 unsigned long rand_num; 2491 struct inet6_dev *idev = ifp->idev; 2492 2493 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 2494 ifp->probes = idev->cnf.dad_transmits; 2495 addrconf_mod_timer(ifp, AC_DAD, rand_num); 2496 } 2497 2498 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) 2499 { 2500 struct inet6_dev *idev = ifp->idev; 2501 struct net_device *dev = idev->dev; 2502 2503 addrconf_join_solict(dev, &ifp->addr); 2504 2505 if (ifp->prefix_len != 128 && (ifp->flags&IFA_F_PERMANENT)) 2506 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0, 2507 flags); 2508 2509 net_srandom(ifp->addr.s6_addr32[3]); 2510 2511 read_lock_bh(&idev->lock); 2512 if (ifp->dead) 2513 goto out; 2514 spin_lock_bh(&ifp->lock); 2515 2516 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 2517 !(ifp->flags&IFA_F_TENTATIVE)) { 2518 ifp->flags &= ~IFA_F_TENTATIVE; 2519 spin_unlock_bh(&ifp->lock); 2520 read_unlock_bh(&idev->lock); 2521 2522 addrconf_dad_completed(ifp); 2523 return; 2524 } 2525 2526 if (!(idev->if_flags & IF_READY)) { 2527 spin_unlock_bh(&ifp->lock); 2528 read_unlock_bh(&idev->lock); 2529 /* 2530 * If the defice is not ready: 2531 * - keep it tentative if it is a permanent address. 2532 * - otherwise, kill it. 2533 */ 2534 in6_ifa_hold(ifp); 2535 addrconf_dad_stop(ifp); 2536 return; 2537 } 2538 addrconf_dad_kick(ifp); 2539 spin_unlock_bh(&ifp->lock); 2540 out: 2541 read_unlock_bh(&idev->lock); 2542 } 2543 2544 static void addrconf_dad_timer(unsigned long data) 2545 { 2546 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2547 struct inet6_dev *idev = ifp->idev; 2548 struct in6_addr unspec; 2549 struct in6_addr mcaddr; 2550 2551 read_lock_bh(&idev->lock); 2552 if (idev->dead) { 2553 read_unlock_bh(&idev->lock); 2554 goto out; 2555 } 2556 spin_lock_bh(&ifp->lock); 2557 if (ifp->probes == 0) { 2558 /* 2559 * DAD was successful 2560 */ 2561 2562 ifp->flags &= ~IFA_F_TENTATIVE; 2563 spin_unlock_bh(&ifp->lock); 2564 read_unlock_bh(&idev->lock); 2565 2566 addrconf_dad_completed(ifp); 2567 2568 goto out; 2569 } 2570 2571 ifp->probes--; 2572 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 2573 spin_unlock_bh(&ifp->lock); 2574 read_unlock_bh(&idev->lock); 2575 2576 /* send a neighbour solicitation for our addr */ 2577 memset(&unspec, 0, sizeof(unspec)); 2578 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 2579 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec); 2580 out: 2581 in6_ifa_put(ifp); 2582 } 2583 2584 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 2585 { 2586 struct net_device * dev = ifp->idev->dev; 2587 2588 /* 2589 * Configure the address for reception. Now it is valid. 2590 */ 2591 2592 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2593 2594 /* If added prefix is link local and forwarding is off, 2595 start sending router solicitations. 2596 */ 2597 2598 if (ifp->idev->cnf.forwarding == 0 && 2599 ifp->idev->cnf.rtr_solicits > 0 && 2600 (dev->flags&IFF_LOOPBACK) == 0 && 2601 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 2602 struct in6_addr all_routers; 2603 2604 ipv6_addr_all_routers(&all_routers); 2605 2606 /* 2607 * If a host as already performed a random delay 2608 * [...] as part of DAD [...] there is no need 2609 * to delay again before sending the first RS 2610 */ 2611 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers); 2612 2613 spin_lock_bh(&ifp->lock); 2614 ifp->probes = 1; 2615 ifp->idev->if_flags |= IF_RS_SENT; 2616 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 2617 spin_unlock_bh(&ifp->lock); 2618 } 2619 } 2620 2621 static void addrconf_dad_run(struct inet6_dev *idev) { 2622 struct inet6_ifaddr *ifp; 2623 2624 read_lock_bh(&idev->lock); 2625 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) { 2626 spin_lock_bh(&ifp->lock); 2627 if (!(ifp->flags & IFA_F_TENTATIVE)) { 2628 spin_unlock_bh(&ifp->lock); 2629 continue; 2630 } 2631 spin_unlock_bh(&ifp->lock); 2632 addrconf_dad_kick(ifp); 2633 } 2634 read_unlock_bh(&idev->lock); 2635 } 2636 2637 #ifdef CONFIG_PROC_FS 2638 struct if6_iter_state { 2639 int bucket; 2640 }; 2641 2642 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq) 2643 { 2644 struct inet6_ifaddr *ifa = NULL; 2645 struct if6_iter_state *state = seq->private; 2646 2647 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 2648 ifa = inet6_addr_lst[state->bucket]; 2649 if (ifa) 2650 break; 2651 } 2652 return ifa; 2653 } 2654 2655 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa) 2656 { 2657 struct if6_iter_state *state = seq->private; 2658 2659 ifa = ifa->lst_next; 2660 try_again: 2661 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) { 2662 ifa = inet6_addr_lst[state->bucket]; 2663 goto try_again; 2664 } 2665 return ifa; 2666 } 2667 2668 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos) 2669 { 2670 struct inet6_ifaddr *ifa = if6_get_first(seq); 2671 2672 if (ifa) 2673 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL) 2674 --pos; 2675 return pos ? NULL : ifa; 2676 } 2677 2678 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 2679 { 2680 read_lock_bh(&addrconf_hash_lock); 2681 return if6_get_idx(seq, *pos); 2682 } 2683 2684 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2685 { 2686 struct inet6_ifaddr *ifa; 2687 2688 ifa = if6_get_next(seq, v); 2689 ++*pos; 2690 return ifa; 2691 } 2692 2693 static void if6_seq_stop(struct seq_file *seq, void *v) 2694 { 2695 read_unlock_bh(&addrconf_hash_lock); 2696 } 2697 2698 static int if6_seq_show(struct seq_file *seq, void *v) 2699 { 2700 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 2701 seq_printf(seq, 2702 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n", 2703 NIP6(ifp->addr), 2704 ifp->idev->dev->ifindex, 2705 ifp->prefix_len, 2706 ifp->scope, 2707 ifp->flags, 2708 ifp->idev->dev->name); 2709 return 0; 2710 } 2711 2712 static struct seq_operations if6_seq_ops = { 2713 .start = if6_seq_start, 2714 .next = if6_seq_next, 2715 .show = if6_seq_show, 2716 .stop = if6_seq_stop, 2717 }; 2718 2719 static int if6_seq_open(struct inode *inode, struct file *file) 2720 { 2721 struct seq_file *seq; 2722 int rc = -ENOMEM; 2723 struct if6_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL); 2724 2725 if (!s) 2726 goto out; 2727 2728 rc = seq_open(file, &if6_seq_ops); 2729 if (rc) 2730 goto out_kfree; 2731 2732 seq = file->private_data; 2733 seq->private = s; 2734 out: 2735 return rc; 2736 out_kfree: 2737 kfree(s); 2738 goto out; 2739 } 2740 2741 static struct file_operations if6_fops = { 2742 .owner = THIS_MODULE, 2743 .open = if6_seq_open, 2744 .read = seq_read, 2745 .llseek = seq_lseek, 2746 .release = seq_release_private, 2747 }; 2748 2749 int __init if6_proc_init(void) 2750 { 2751 if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops)) 2752 return -ENOMEM; 2753 return 0; 2754 } 2755 2756 void if6_proc_exit(void) 2757 { 2758 proc_net_remove("if_inet6"); 2759 } 2760 #endif /* CONFIG_PROC_FS */ 2761 2762 /* 2763 * Periodic address status verification 2764 */ 2765 2766 static void addrconf_verify(unsigned long foo) 2767 { 2768 struct inet6_ifaddr *ifp; 2769 unsigned long now, next; 2770 int i; 2771 2772 spin_lock_bh(&addrconf_verify_lock); 2773 now = jiffies; 2774 next = now + ADDR_CHECK_FREQUENCY; 2775 2776 del_timer(&addr_chk_timer); 2777 2778 for (i=0; i < IN6_ADDR_HSIZE; i++) { 2779 2780 restart: 2781 read_lock(&addrconf_hash_lock); 2782 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) { 2783 unsigned long age; 2784 #ifdef CONFIG_IPV6_PRIVACY 2785 unsigned long regen_advance; 2786 #endif 2787 2788 if (ifp->flags & IFA_F_PERMANENT) 2789 continue; 2790 2791 spin_lock(&ifp->lock); 2792 age = (now - ifp->tstamp) / HZ; 2793 2794 #ifdef CONFIG_IPV6_PRIVACY 2795 regen_advance = ifp->idev->cnf.regen_max_retry * 2796 ifp->idev->cnf.dad_transmits * 2797 ifp->idev->nd_parms->retrans_time / HZ; 2798 #endif 2799 2800 if (ifp->valid_lft != INFINITY_LIFE_TIME && 2801 age >= ifp->valid_lft) { 2802 spin_unlock(&ifp->lock); 2803 in6_ifa_hold(ifp); 2804 read_unlock(&addrconf_hash_lock); 2805 ipv6_del_addr(ifp); 2806 goto restart; 2807 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 2808 spin_unlock(&ifp->lock); 2809 continue; 2810 } else if (age >= ifp->prefered_lft) { 2811 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */ 2812 int deprecate = 0; 2813 2814 if (!(ifp->flags&IFA_F_DEPRECATED)) { 2815 deprecate = 1; 2816 ifp->flags |= IFA_F_DEPRECATED; 2817 } 2818 2819 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 2820 next = ifp->tstamp + ifp->valid_lft * HZ; 2821 2822 spin_unlock(&ifp->lock); 2823 2824 if (deprecate) { 2825 in6_ifa_hold(ifp); 2826 read_unlock(&addrconf_hash_lock); 2827 2828 ipv6_ifa_notify(0, ifp); 2829 in6_ifa_put(ifp); 2830 goto restart; 2831 } 2832 #ifdef CONFIG_IPV6_PRIVACY 2833 } else if ((ifp->flags&IFA_F_TEMPORARY) && 2834 !(ifp->flags&IFA_F_TENTATIVE)) { 2835 if (age >= ifp->prefered_lft - regen_advance) { 2836 struct inet6_ifaddr *ifpub = ifp->ifpub; 2837 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 2838 next = ifp->tstamp + ifp->prefered_lft * HZ; 2839 if (!ifp->regen_count && ifpub) { 2840 ifp->regen_count++; 2841 in6_ifa_hold(ifp); 2842 in6_ifa_hold(ifpub); 2843 spin_unlock(&ifp->lock); 2844 read_unlock(&addrconf_hash_lock); 2845 spin_lock(&ifpub->lock); 2846 ifpub->regen_count = 0; 2847 spin_unlock(&ifpub->lock); 2848 ipv6_create_tempaddr(ifpub, ifp); 2849 in6_ifa_put(ifpub); 2850 in6_ifa_put(ifp); 2851 goto restart; 2852 } 2853 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 2854 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 2855 spin_unlock(&ifp->lock); 2856 #endif 2857 } else { 2858 /* ifp->prefered_lft <= ifp->valid_lft */ 2859 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 2860 next = ifp->tstamp + ifp->prefered_lft * HZ; 2861 spin_unlock(&ifp->lock); 2862 } 2863 } 2864 read_unlock(&addrconf_hash_lock); 2865 } 2866 2867 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next; 2868 add_timer(&addr_chk_timer); 2869 spin_unlock_bh(&addrconf_verify_lock); 2870 } 2871 2872 static int 2873 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 2874 { 2875 struct rtattr **rta = arg; 2876 struct ifaddrmsg *ifm = NLMSG_DATA(nlh); 2877 struct in6_addr *pfx; 2878 2879 pfx = NULL; 2880 if (rta[IFA_ADDRESS-1]) { 2881 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx)) 2882 return -EINVAL; 2883 pfx = RTA_DATA(rta[IFA_ADDRESS-1]); 2884 } 2885 if (rta[IFA_LOCAL-1]) { 2886 if (RTA_PAYLOAD(rta[IFA_LOCAL-1]) < sizeof(*pfx) || 2887 (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))) 2888 return -EINVAL; 2889 pfx = RTA_DATA(rta[IFA_LOCAL-1]); 2890 } 2891 if (pfx == NULL) 2892 return -EINVAL; 2893 2894 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen); 2895 } 2896 2897 static int 2898 inet6_addr_modify(int ifindex, struct in6_addr *pfx, 2899 __u32 prefered_lft, __u32 valid_lft) 2900 { 2901 struct inet6_ifaddr *ifp = NULL; 2902 struct net_device *dev; 2903 int ifa_flags = 0; 2904 2905 if ((dev = __dev_get_by_index(ifindex)) == NULL) 2906 return -ENODEV; 2907 2908 if (!(dev->flags&IFF_UP)) 2909 return -ENETDOWN; 2910 2911 if (!valid_lft || (prefered_lft > valid_lft)) 2912 return -EINVAL; 2913 2914 ifp = ipv6_get_ifaddr(pfx, dev, 1); 2915 if (ifp == NULL) 2916 return -ENOENT; 2917 2918 if (valid_lft == INFINITY_LIFE_TIME) 2919 ifa_flags = IFA_F_PERMANENT; 2920 else if (valid_lft >= 0x7FFFFFFF/HZ) 2921 valid_lft = 0x7FFFFFFF/HZ; 2922 2923 if (prefered_lft == 0) 2924 ifa_flags = IFA_F_DEPRECATED; 2925 else if ((prefered_lft >= 0x7FFFFFFF/HZ) && 2926 (prefered_lft != INFINITY_LIFE_TIME)) 2927 prefered_lft = 0x7FFFFFFF/HZ; 2928 2929 spin_lock_bh(&ifp->lock); 2930 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED|IFA_F_PERMANENT)) | ifa_flags; 2931 2932 ifp->tstamp = jiffies; 2933 ifp->valid_lft = valid_lft; 2934 ifp->prefered_lft = prefered_lft; 2935 2936 spin_unlock_bh(&ifp->lock); 2937 if (!(ifp->flags&IFA_F_TENTATIVE)) 2938 ipv6_ifa_notify(0, ifp); 2939 in6_ifa_put(ifp); 2940 2941 addrconf_verify(0); 2942 2943 return 0; 2944 } 2945 2946 static int 2947 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 2948 { 2949 struct rtattr **rta = arg; 2950 struct ifaddrmsg *ifm = NLMSG_DATA(nlh); 2951 struct in6_addr *pfx; 2952 __u32 valid_lft = INFINITY_LIFE_TIME, prefered_lft = INFINITY_LIFE_TIME; 2953 2954 pfx = NULL; 2955 if (rta[IFA_ADDRESS-1]) { 2956 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx)) 2957 return -EINVAL; 2958 pfx = RTA_DATA(rta[IFA_ADDRESS-1]); 2959 } 2960 if (rta[IFA_LOCAL-1]) { 2961 if (RTA_PAYLOAD(rta[IFA_LOCAL-1]) < sizeof(*pfx) || 2962 (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))) 2963 return -EINVAL; 2964 pfx = RTA_DATA(rta[IFA_LOCAL-1]); 2965 } 2966 if (pfx == NULL) 2967 return -EINVAL; 2968 2969 if (rta[IFA_CACHEINFO-1]) { 2970 struct ifa_cacheinfo *ci; 2971 if (RTA_PAYLOAD(rta[IFA_CACHEINFO-1]) < sizeof(*ci)) 2972 return -EINVAL; 2973 ci = RTA_DATA(rta[IFA_CACHEINFO-1]); 2974 valid_lft = ci->ifa_valid; 2975 prefered_lft = ci->ifa_prefered; 2976 } 2977 2978 if (nlh->nlmsg_flags & NLM_F_REPLACE) { 2979 int ret; 2980 ret = inet6_addr_modify(ifm->ifa_index, pfx, 2981 prefered_lft, valid_lft); 2982 if (ret == 0 || !(nlh->nlmsg_flags & NLM_F_CREATE)) 2983 return ret; 2984 } 2985 2986 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen, 2987 prefered_lft, valid_lft); 2988 2989 } 2990 2991 /* Maximum length of ifa_cacheinfo attributes */ 2992 #define INET6_IFADDR_RTA_SPACE \ 2993 RTA_SPACE(16) /* IFA_ADDRESS */ + \ 2994 RTA_SPACE(sizeof(struct ifa_cacheinfo)) /* CACHEINFO */ 2995 2996 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 2997 u32 pid, u32 seq, int event, unsigned int flags) 2998 { 2999 struct ifaddrmsg *ifm; 3000 struct nlmsghdr *nlh; 3001 struct ifa_cacheinfo ci; 3002 unsigned char *b = skb->tail; 3003 3004 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags); 3005 ifm = NLMSG_DATA(nlh); 3006 ifm->ifa_family = AF_INET6; 3007 ifm->ifa_prefixlen = ifa->prefix_len; 3008 ifm->ifa_flags = ifa->flags; 3009 ifm->ifa_scope = RT_SCOPE_UNIVERSE; 3010 if (ifa->scope&IFA_HOST) 3011 ifm->ifa_scope = RT_SCOPE_HOST; 3012 else if (ifa->scope&IFA_LINK) 3013 ifm->ifa_scope = RT_SCOPE_LINK; 3014 else if (ifa->scope&IFA_SITE) 3015 ifm->ifa_scope = RT_SCOPE_SITE; 3016 ifm->ifa_index = ifa->idev->dev->ifindex; 3017 RTA_PUT(skb, IFA_ADDRESS, 16, &ifa->addr); 3018 if (!(ifa->flags&IFA_F_PERMANENT)) { 3019 ci.ifa_prefered = ifa->prefered_lft; 3020 ci.ifa_valid = ifa->valid_lft; 3021 if (ci.ifa_prefered != INFINITY_LIFE_TIME) { 3022 long tval = (jiffies - ifa->tstamp)/HZ; 3023 ci.ifa_prefered -= tval; 3024 if (ci.ifa_valid != INFINITY_LIFE_TIME) 3025 ci.ifa_valid -= tval; 3026 } 3027 } else { 3028 ci.ifa_prefered = INFINITY_LIFE_TIME; 3029 ci.ifa_valid = INFINITY_LIFE_TIME; 3030 } 3031 ci.cstamp = (__u32)(TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) / HZ * 100 3032 + TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3033 ci.tstamp = (__u32)(TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) / HZ * 100 3034 + TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3035 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3036 nlh->nlmsg_len = skb->tail - b; 3037 return skb->len; 3038 3039 nlmsg_failure: 3040 rtattr_failure: 3041 skb_trim(skb, b - skb->data); 3042 return -1; 3043 } 3044 3045 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3046 u32 pid, u32 seq, int event, u16 flags) 3047 { 3048 struct ifaddrmsg *ifm; 3049 struct nlmsghdr *nlh; 3050 struct ifa_cacheinfo ci; 3051 unsigned char *b = skb->tail; 3052 3053 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags); 3054 ifm = NLMSG_DATA(nlh); 3055 ifm->ifa_family = AF_INET6; 3056 ifm->ifa_prefixlen = 128; 3057 ifm->ifa_flags = IFA_F_PERMANENT; 3058 ifm->ifa_scope = RT_SCOPE_UNIVERSE; 3059 if (ipv6_addr_scope(&ifmca->mca_addr)&IFA_SITE) 3060 ifm->ifa_scope = RT_SCOPE_SITE; 3061 ifm->ifa_index = ifmca->idev->dev->ifindex; 3062 RTA_PUT(skb, IFA_MULTICAST, 16, &ifmca->mca_addr); 3063 ci.cstamp = (__u32)(TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) / HZ 3064 * 100 + TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) % HZ 3065 * 100 / HZ); 3066 ci.tstamp = (__u32)(TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) / HZ 3067 * 100 + TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) % HZ 3068 * 100 / HZ); 3069 ci.ifa_prefered = INFINITY_LIFE_TIME; 3070 ci.ifa_valid = INFINITY_LIFE_TIME; 3071 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3072 nlh->nlmsg_len = skb->tail - b; 3073 return skb->len; 3074 3075 nlmsg_failure: 3076 rtattr_failure: 3077 skb_trim(skb, b - skb->data); 3078 return -1; 3079 } 3080 3081 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3082 u32 pid, u32 seq, int event, unsigned int flags) 3083 { 3084 struct ifaddrmsg *ifm; 3085 struct nlmsghdr *nlh; 3086 struct ifa_cacheinfo ci; 3087 unsigned char *b = skb->tail; 3088 3089 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags); 3090 ifm = NLMSG_DATA(nlh); 3091 ifm->ifa_family = AF_INET6; 3092 ifm->ifa_prefixlen = 128; 3093 ifm->ifa_flags = IFA_F_PERMANENT; 3094 ifm->ifa_scope = RT_SCOPE_UNIVERSE; 3095 if (ipv6_addr_scope(&ifaca->aca_addr)&IFA_SITE) 3096 ifm->ifa_scope = RT_SCOPE_SITE; 3097 ifm->ifa_index = ifaca->aca_idev->dev->ifindex; 3098 RTA_PUT(skb, IFA_ANYCAST, 16, &ifaca->aca_addr); 3099 ci.cstamp = (__u32)(TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) / HZ 3100 * 100 + TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) % HZ 3101 * 100 / HZ); 3102 ci.tstamp = (__u32)(TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) / HZ 3103 * 100 + TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) % HZ 3104 * 100 / HZ); 3105 ci.ifa_prefered = INFINITY_LIFE_TIME; 3106 ci.ifa_valid = INFINITY_LIFE_TIME; 3107 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3108 nlh->nlmsg_len = skb->tail - b; 3109 return skb->len; 3110 3111 nlmsg_failure: 3112 rtattr_failure: 3113 skb_trim(skb, b - skb->data); 3114 return -1; 3115 } 3116 3117 enum addr_type_t 3118 { 3119 UNICAST_ADDR, 3120 MULTICAST_ADDR, 3121 ANYCAST_ADDR, 3122 }; 3123 3124 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3125 enum addr_type_t type) 3126 { 3127 int idx, ip_idx; 3128 int s_idx, s_ip_idx; 3129 int err = 1; 3130 struct net_device *dev; 3131 struct inet6_dev *idev = NULL; 3132 struct inet6_ifaddr *ifa; 3133 struct ifmcaddr6 *ifmca; 3134 struct ifacaddr6 *ifaca; 3135 3136 s_idx = cb->args[0]; 3137 s_ip_idx = ip_idx = cb->args[1]; 3138 read_lock(&dev_base_lock); 3139 3140 for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) { 3141 if (idx < s_idx) 3142 continue; 3143 if (idx > s_idx) 3144 s_ip_idx = 0; 3145 ip_idx = 0; 3146 if ((idev = in6_dev_get(dev)) == NULL) 3147 continue; 3148 read_lock_bh(&idev->lock); 3149 switch (type) { 3150 case UNICAST_ADDR: 3151 /* unicast address incl. temp addr */ 3152 for (ifa = idev->addr_list; ifa; 3153 ifa = ifa->if_next, ip_idx++) { 3154 if (ip_idx < s_ip_idx) 3155 continue; 3156 if ((err = inet6_fill_ifaddr(skb, ifa, 3157 NETLINK_CB(cb->skb).pid, 3158 cb->nlh->nlmsg_seq, RTM_NEWADDR, 3159 NLM_F_MULTI)) <= 0) 3160 goto done; 3161 } 3162 break; 3163 case MULTICAST_ADDR: 3164 /* multicast address */ 3165 for (ifmca = idev->mc_list; ifmca; 3166 ifmca = ifmca->next, ip_idx++) { 3167 if (ip_idx < s_ip_idx) 3168 continue; 3169 if ((err = inet6_fill_ifmcaddr(skb, ifmca, 3170 NETLINK_CB(cb->skb).pid, 3171 cb->nlh->nlmsg_seq, RTM_GETMULTICAST, 3172 NLM_F_MULTI)) <= 0) 3173 goto done; 3174 } 3175 break; 3176 case ANYCAST_ADDR: 3177 /* anycast address */ 3178 for (ifaca = idev->ac_list; ifaca; 3179 ifaca = ifaca->aca_next, ip_idx++) { 3180 if (ip_idx < s_ip_idx) 3181 continue; 3182 if ((err = inet6_fill_ifacaddr(skb, ifaca, 3183 NETLINK_CB(cb->skb).pid, 3184 cb->nlh->nlmsg_seq, RTM_GETANYCAST, 3185 NLM_F_MULTI)) <= 0) 3186 goto done; 3187 } 3188 break; 3189 default: 3190 break; 3191 } 3192 read_unlock_bh(&idev->lock); 3193 in6_dev_put(idev); 3194 } 3195 done: 3196 if (err <= 0) { 3197 read_unlock_bh(&idev->lock); 3198 in6_dev_put(idev); 3199 } 3200 read_unlock(&dev_base_lock); 3201 cb->args[0] = idx; 3202 cb->args[1] = ip_idx; 3203 return skb->len; 3204 } 3205 3206 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 3207 { 3208 enum addr_type_t type = UNICAST_ADDR; 3209 return inet6_dump_addr(skb, cb, type); 3210 } 3211 3212 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 3213 { 3214 enum addr_type_t type = MULTICAST_ADDR; 3215 return inet6_dump_addr(skb, cb, type); 3216 } 3217 3218 3219 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 3220 { 3221 enum addr_type_t type = ANYCAST_ADDR; 3222 return inet6_dump_addr(skb, cb, type); 3223 } 3224 3225 static int inet6_rtm_getaddr(struct sk_buff *in_skb, 3226 struct nlmsghdr* nlh, void *arg) 3227 { 3228 struct rtattr **rta = arg; 3229 struct ifaddrmsg *ifm = NLMSG_DATA(nlh); 3230 struct in6_addr *addr = NULL; 3231 struct net_device *dev = NULL; 3232 struct inet6_ifaddr *ifa; 3233 struct sk_buff *skb; 3234 int size = NLMSG_SPACE(sizeof(struct ifaddrmsg) + INET6_IFADDR_RTA_SPACE); 3235 int err; 3236 3237 if (rta[IFA_ADDRESS-1]) { 3238 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*addr)) 3239 return -EINVAL; 3240 addr = RTA_DATA(rta[IFA_ADDRESS-1]); 3241 } 3242 if (rta[IFA_LOCAL-1]) { 3243 if (RTA_PAYLOAD(rta[IFA_LOCAL-1]) < sizeof(*addr) || 3244 (addr && memcmp(addr, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*addr)))) 3245 return -EINVAL; 3246 addr = RTA_DATA(rta[IFA_LOCAL-1]); 3247 } 3248 if (addr == NULL) 3249 return -EINVAL; 3250 3251 if (ifm->ifa_index) 3252 dev = __dev_get_by_index(ifm->ifa_index); 3253 3254 if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) 3255 return -EADDRNOTAVAIL; 3256 3257 if ((skb = alloc_skb(size, GFP_KERNEL)) == NULL) { 3258 err = -ENOBUFS; 3259 goto out; 3260 } 3261 3262 NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid; 3263 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid, 3264 nlh->nlmsg_seq, RTM_NEWADDR, 0); 3265 if (err < 0) { 3266 err = -EMSGSIZE; 3267 goto out_free; 3268 } 3269 3270 err = netlink_unicast(rtnl, skb, NETLINK_CB(in_skb).pid, MSG_DONTWAIT); 3271 if (err > 0) 3272 err = 0; 3273 out: 3274 in6_ifa_put(ifa); 3275 return err; 3276 out_free: 3277 kfree_skb(skb); 3278 goto out; 3279 } 3280 3281 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 3282 { 3283 struct sk_buff *skb; 3284 int size = NLMSG_SPACE(sizeof(struct ifaddrmsg) + INET6_IFADDR_RTA_SPACE); 3285 3286 skb = alloc_skb(size, GFP_ATOMIC); 3287 if (!skb) { 3288 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, ENOBUFS); 3289 return; 3290 } 3291 if (inet6_fill_ifaddr(skb, ifa, current->pid, 0, event, 0) < 0) { 3292 kfree_skb(skb); 3293 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, EINVAL); 3294 return; 3295 } 3296 NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFADDR; 3297 netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFADDR, GFP_ATOMIC); 3298 } 3299 3300 static void inline ipv6_store_devconf(struct ipv6_devconf *cnf, 3301 __s32 *array, int bytes) 3302 { 3303 memset(array, 0, bytes); 3304 array[DEVCONF_FORWARDING] = cnf->forwarding; 3305 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 3306 array[DEVCONF_MTU6] = cnf->mtu6; 3307 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 3308 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 3309 array[DEVCONF_AUTOCONF] = cnf->autoconf; 3310 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 3311 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 3312 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval; 3313 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay; 3314 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 3315 #ifdef CONFIG_IPV6_PRIVACY 3316 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 3317 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 3318 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 3319 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 3320 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 3321 #endif 3322 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 3323 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 3324 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 3325 #ifdef CONFIG_IPV6_ROUTER_PREF 3326 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 3327 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval; 3328 #ifdef CONFIV_IPV6_ROUTE_INFO 3329 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 3330 #endif 3331 #endif 3332 } 3333 3334 /* Maximum length of ifinfomsg attributes */ 3335 #define INET6_IFINFO_RTA_SPACE \ 3336 RTA_SPACE(IFNAMSIZ) /* IFNAME */ + \ 3337 RTA_SPACE(MAX_ADDR_LEN) /* ADDRESS */ + \ 3338 RTA_SPACE(sizeof(u32)) /* MTU */ + \ 3339 RTA_SPACE(sizeof(int)) /* LINK */ + \ 3340 RTA_SPACE(0) /* PROTINFO */ + \ 3341 RTA_SPACE(sizeof(u32)) /* FLAGS */ + \ 3342 RTA_SPACE(sizeof(struct ifla_cacheinfo)) /* CACHEINFO */ + \ 3343 RTA_SPACE(sizeof(__s32[DEVCONF_MAX])) /* CONF */ 3344 3345 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 3346 u32 pid, u32 seq, int event, unsigned int flags) 3347 { 3348 struct net_device *dev = idev->dev; 3349 __s32 *array = NULL; 3350 struct ifinfomsg *r; 3351 struct nlmsghdr *nlh; 3352 unsigned char *b = skb->tail; 3353 struct rtattr *subattr; 3354 __u32 mtu = dev->mtu; 3355 struct ifla_cacheinfo ci; 3356 3357 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags); 3358 r = NLMSG_DATA(nlh); 3359 r->ifi_family = AF_INET6; 3360 r->__ifi_pad = 0; 3361 r->ifi_type = dev->type; 3362 r->ifi_index = dev->ifindex; 3363 r->ifi_flags = dev_get_flags(dev); 3364 r->ifi_change = 0; 3365 3366 RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name); 3367 3368 if (dev->addr_len) 3369 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 3370 3371 RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu); 3372 if (dev->ifindex != dev->iflink) 3373 RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink); 3374 3375 subattr = (struct rtattr*)skb->tail; 3376 3377 RTA_PUT(skb, IFLA_PROTINFO, 0, NULL); 3378 3379 /* return the device flags */ 3380 RTA_PUT(skb, IFLA_INET6_FLAGS, sizeof(__u32), &idev->if_flags); 3381 3382 /* return interface cacheinfo */ 3383 ci.max_reasm_len = IPV6_MAXPLEN; 3384 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100 3385 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); 3386 ci.reachable_time = idev->nd_parms->reachable_time; 3387 ci.retrans_time = idev->nd_parms->retrans_time; 3388 RTA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci); 3389 3390 /* return the device sysctl params */ 3391 if ((array = kmalloc(DEVCONF_MAX * sizeof(*array), GFP_ATOMIC)) == NULL) 3392 goto rtattr_failure; 3393 ipv6_store_devconf(&idev->cnf, array, DEVCONF_MAX * sizeof(*array)); 3394 RTA_PUT(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(*array), array); 3395 3396 /* XXX - Statistics/MC not implemented */ 3397 subattr->rta_len = skb->tail - (u8*)subattr; 3398 3399 nlh->nlmsg_len = skb->tail - b; 3400 kfree(array); 3401 return skb->len; 3402 3403 nlmsg_failure: 3404 rtattr_failure: 3405 kfree(array); 3406 skb_trim(skb, b - skb->data); 3407 return -1; 3408 } 3409 3410 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 3411 { 3412 int idx, err; 3413 int s_idx = cb->args[0]; 3414 struct net_device *dev; 3415 struct inet6_dev *idev; 3416 3417 read_lock(&dev_base_lock); 3418 for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) { 3419 if (idx < s_idx) 3420 continue; 3421 if ((idev = in6_dev_get(dev)) == NULL) 3422 continue; 3423 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid, 3424 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI); 3425 in6_dev_put(idev); 3426 if (err <= 0) 3427 break; 3428 } 3429 read_unlock(&dev_base_lock); 3430 cb->args[0] = idx; 3431 3432 return skb->len; 3433 } 3434 3435 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 3436 { 3437 struct sk_buff *skb; 3438 int size = NLMSG_SPACE(sizeof(struct ifinfomsg) + INET6_IFINFO_RTA_SPACE); 3439 3440 skb = alloc_skb(size, GFP_ATOMIC); 3441 if (!skb) { 3442 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, ENOBUFS); 3443 return; 3444 } 3445 if (inet6_fill_ifinfo(skb, idev, current->pid, 0, event, 0) < 0) { 3446 kfree_skb(skb); 3447 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, EINVAL); 3448 return; 3449 } 3450 NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFINFO; 3451 netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFINFO, GFP_ATOMIC); 3452 } 3453 3454 /* Maximum length of prefix_cacheinfo attributes */ 3455 #define INET6_PREFIX_RTA_SPACE \ 3456 RTA_SPACE(sizeof(((struct prefix_info *)NULL)->prefix)) /* ADDRESS */ + \ 3457 RTA_SPACE(sizeof(struct prefix_cacheinfo)) /* CACHEINFO */ 3458 3459 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 3460 struct prefix_info *pinfo, u32 pid, u32 seq, 3461 int event, unsigned int flags) 3462 { 3463 struct prefixmsg *pmsg; 3464 struct nlmsghdr *nlh; 3465 unsigned char *b = skb->tail; 3466 struct prefix_cacheinfo ci; 3467 3468 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*pmsg), flags); 3469 pmsg = NLMSG_DATA(nlh); 3470 pmsg->prefix_family = AF_INET6; 3471 pmsg->prefix_pad1 = 0; 3472 pmsg->prefix_pad2 = 0; 3473 pmsg->prefix_ifindex = idev->dev->ifindex; 3474 pmsg->prefix_len = pinfo->prefix_len; 3475 pmsg->prefix_type = pinfo->type; 3476 pmsg->prefix_pad3 = 0; 3477 3478 pmsg->prefix_flags = 0; 3479 if (pinfo->onlink) 3480 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 3481 if (pinfo->autoconf) 3482 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 3483 3484 RTA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix); 3485 3486 ci.preferred_time = ntohl(pinfo->prefered); 3487 ci.valid_time = ntohl(pinfo->valid); 3488 RTA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci); 3489 3490 nlh->nlmsg_len = skb->tail - b; 3491 return skb->len; 3492 3493 nlmsg_failure: 3494 rtattr_failure: 3495 skb_trim(skb, b - skb->data); 3496 return -1; 3497 } 3498 3499 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 3500 struct prefix_info *pinfo) 3501 { 3502 struct sk_buff *skb; 3503 int size = NLMSG_SPACE(sizeof(struct prefixmsg) + INET6_PREFIX_RTA_SPACE); 3504 3505 skb = alloc_skb(size, GFP_ATOMIC); 3506 if (!skb) { 3507 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, ENOBUFS); 3508 return; 3509 } 3510 if (inet6_fill_prefix(skb, idev, pinfo, current->pid, 0, event, 0) < 0) { 3511 kfree_skb(skb); 3512 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, EINVAL); 3513 return; 3514 } 3515 NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_PREFIX; 3516 netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_PREFIX, GFP_ATOMIC); 3517 } 3518 3519 static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = { 3520 [RTM_GETLINK - RTM_BASE] = { .dumpit = inet6_dump_ifinfo, }, 3521 [RTM_NEWADDR - RTM_BASE] = { .doit = inet6_rtm_newaddr, }, 3522 [RTM_DELADDR - RTM_BASE] = { .doit = inet6_rtm_deladdr, }, 3523 [RTM_GETADDR - RTM_BASE] = { .doit = inet6_rtm_getaddr, 3524 .dumpit = inet6_dump_ifaddr, }, 3525 [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, }, 3526 [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, }, 3527 [RTM_NEWROUTE - RTM_BASE] = { .doit = inet6_rtm_newroute, }, 3528 [RTM_DELROUTE - RTM_BASE] = { .doit = inet6_rtm_delroute, }, 3529 [RTM_GETROUTE - RTM_BASE] = { .doit = inet6_rtm_getroute, 3530 .dumpit = inet6_dump_fib, }, 3531 }; 3532 3533 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3534 { 3535 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 3536 3537 switch (event) { 3538 case RTM_NEWADDR: 3539 ip6_ins_rt(ifp->rt, NULL, NULL, NULL); 3540 if (ifp->idev->cnf.forwarding) 3541 addrconf_join_anycast(ifp); 3542 break; 3543 case RTM_DELADDR: 3544 if (ifp->idev->cnf.forwarding) 3545 addrconf_leave_anycast(ifp); 3546 addrconf_leave_solict(ifp->idev, &ifp->addr); 3547 dst_hold(&ifp->rt->u.dst); 3548 if (ip6_del_rt(ifp->rt, NULL, NULL, NULL)) 3549 dst_free(&ifp->rt->u.dst); 3550 break; 3551 } 3552 } 3553 3554 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 3555 { 3556 read_lock_bh(&addrconf_lock); 3557 if (likely(ifp->idev->dead == 0)) 3558 __ipv6_ifa_notify(event, ifp); 3559 read_unlock_bh(&addrconf_lock); 3560 } 3561 3562 #ifdef CONFIG_SYSCTL 3563 3564 static 3565 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp, 3566 void __user *buffer, size_t *lenp, loff_t *ppos) 3567 { 3568 int *valp = ctl->data; 3569 int val = *valp; 3570 int ret; 3571 3572 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); 3573 3574 if (write && valp != &ipv6_devconf_dflt.forwarding) { 3575 if (valp != &ipv6_devconf.forwarding) { 3576 if ((!*valp) ^ (!val)) { 3577 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 3578 if (idev == NULL) 3579 return ret; 3580 dev_forward_change(idev); 3581 } 3582 } else { 3583 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding; 3584 addrconf_forward_change(); 3585 } 3586 if (*valp) 3587 rt6_purge_dflt_routers(); 3588 } 3589 3590 return ret; 3591 } 3592 3593 static int addrconf_sysctl_forward_strategy(ctl_table *table, 3594 int __user *name, int nlen, 3595 void __user *oldval, 3596 size_t __user *oldlenp, 3597 void __user *newval, size_t newlen, 3598 void **context) 3599 { 3600 int *valp = table->data; 3601 int new; 3602 3603 if (!newval || !newlen) 3604 return 0; 3605 if (newlen != sizeof(int)) 3606 return -EINVAL; 3607 if (get_user(new, (int __user *)newval)) 3608 return -EFAULT; 3609 if (new == *valp) 3610 return 0; 3611 if (oldval && oldlenp) { 3612 size_t len; 3613 if (get_user(len, oldlenp)) 3614 return -EFAULT; 3615 if (len) { 3616 if (len > table->maxlen) 3617 len = table->maxlen; 3618 if (copy_to_user(oldval, valp, len)) 3619 return -EFAULT; 3620 if (put_user(len, oldlenp)) 3621 return -EFAULT; 3622 } 3623 } 3624 3625 if (valp != &ipv6_devconf_dflt.forwarding) { 3626 if (valp != &ipv6_devconf.forwarding) { 3627 struct inet6_dev *idev = (struct inet6_dev *)table->extra1; 3628 int changed; 3629 if (unlikely(idev == NULL)) 3630 return -ENODEV; 3631 changed = (!*valp) ^ (!new); 3632 *valp = new; 3633 if (changed) 3634 dev_forward_change(idev); 3635 } else { 3636 *valp = new; 3637 addrconf_forward_change(); 3638 } 3639 3640 if (*valp) 3641 rt6_purge_dflt_routers(); 3642 } else 3643 *valp = new; 3644 3645 return 1; 3646 } 3647 3648 static struct addrconf_sysctl_table 3649 { 3650 struct ctl_table_header *sysctl_header; 3651 ctl_table addrconf_vars[__NET_IPV6_MAX]; 3652 ctl_table addrconf_dev[2]; 3653 ctl_table addrconf_conf_dir[2]; 3654 ctl_table addrconf_proto_dir[2]; 3655 ctl_table addrconf_root_dir[2]; 3656 } addrconf_sysctl = { 3657 .sysctl_header = NULL, 3658 .addrconf_vars = { 3659 { 3660 .ctl_name = NET_IPV6_FORWARDING, 3661 .procname = "forwarding", 3662 .data = &ipv6_devconf.forwarding, 3663 .maxlen = sizeof(int), 3664 .mode = 0644, 3665 .proc_handler = &addrconf_sysctl_forward, 3666 .strategy = &addrconf_sysctl_forward_strategy, 3667 }, 3668 { 3669 .ctl_name = NET_IPV6_HOP_LIMIT, 3670 .procname = "hop_limit", 3671 .data = &ipv6_devconf.hop_limit, 3672 .maxlen = sizeof(int), 3673 .mode = 0644, 3674 .proc_handler = proc_dointvec, 3675 }, 3676 { 3677 .ctl_name = NET_IPV6_MTU, 3678 .procname = "mtu", 3679 .data = &ipv6_devconf.mtu6, 3680 .maxlen = sizeof(int), 3681 .mode = 0644, 3682 .proc_handler = &proc_dointvec, 3683 }, 3684 { 3685 .ctl_name = NET_IPV6_ACCEPT_RA, 3686 .procname = "accept_ra", 3687 .data = &ipv6_devconf.accept_ra, 3688 .maxlen = sizeof(int), 3689 .mode = 0644, 3690 .proc_handler = &proc_dointvec, 3691 }, 3692 { 3693 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS, 3694 .procname = "accept_redirects", 3695 .data = &ipv6_devconf.accept_redirects, 3696 .maxlen = sizeof(int), 3697 .mode = 0644, 3698 .proc_handler = &proc_dointvec, 3699 }, 3700 { 3701 .ctl_name = NET_IPV6_AUTOCONF, 3702 .procname = "autoconf", 3703 .data = &ipv6_devconf.autoconf, 3704 .maxlen = sizeof(int), 3705 .mode = 0644, 3706 .proc_handler = &proc_dointvec, 3707 }, 3708 { 3709 .ctl_name = NET_IPV6_DAD_TRANSMITS, 3710 .procname = "dad_transmits", 3711 .data = &ipv6_devconf.dad_transmits, 3712 .maxlen = sizeof(int), 3713 .mode = 0644, 3714 .proc_handler = &proc_dointvec, 3715 }, 3716 { 3717 .ctl_name = NET_IPV6_RTR_SOLICITS, 3718 .procname = "router_solicitations", 3719 .data = &ipv6_devconf.rtr_solicits, 3720 .maxlen = sizeof(int), 3721 .mode = 0644, 3722 .proc_handler = &proc_dointvec, 3723 }, 3724 { 3725 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL, 3726 .procname = "router_solicitation_interval", 3727 .data = &ipv6_devconf.rtr_solicit_interval, 3728 .maxlen = sizeof(int), 3729 .mode = 0644, 3730 .proc_handler = &proc_dointvec_jiffies, 3731 .strategy = &sysctl_jiffies, 3732 }, 3733 { 3734 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY, 3735 .procname = "router_solicitation_delay", 3736 .data = &ipv6_devconf.rtr_solicit_delay, 3737 .maxlen = sizeof(int), 3738 .mode = 0644, 3739 .proc_handler = &proc_dointvec_jiffies, 3740 .strategy = &sysctl_jiffies, 3741 }, 3742 { 3743 .ctl_name = NET_IPV6_FORCE_MLD_VERSION, 3744 .procname = "force_mld_version", 3745 .data = &ipv6_devconf.force_mld_version, 3746 .maxlen = sizeof(int), 3747 .mode = 0644, 3748 .proc_handler = &proc_dointvec, 3749 }, 3750 #ifdef CONFIG_IPV6_PRIVACY 3751 { 3752 .ctl_name = NET_IPV6_USE_TEMPADDR, 3753 .procname = "use_tempaddr", 3754 .data = &ipv6_devconf.use_tempaddr, 3755 .maxlen = sizeof(int), 3756 .mode = 0644, 3757 .proc_handler = &proc_dointvec, 3758 }, 3759 { 3760 .ctl_name = NET_IPV6_TEMP_VALID_LFT, 3761 .procname = "temp_valid_lft", 3762 .data = &ipv6_devconf.temp_valid_lft, 3763 .maxlen = sizeof(int), 3764 .mode = 0644, 3765 .proc_handler = &proc_dointvec, 3766 }, 3767 { 3768 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT, 3769 .procname = "temp_prefered_lft", 3770 .data = &ipv6_devconf.temp_prefered_lft, 3771 .maxlen = sizeof(int), 3772 .mode = 0644, 3773 .proc_handler = &proc_dointvec, 3774 }, 3775 { 3776 .ctl_name = NET_IPV6_REGEN_MAX_RETRY, 3777 .procname = "regen_max_retry", 3778 .data = &ipv6_devconf.regen_max_retry, 3779 .maxlen = sizeof(int), 3780 .mode = 0644, 3781 .proc_handler = &proc_dointvec, 3782 }, 3783 { 3784 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR, 3785 .procname = "max_desync_factor", 3786 .data = &ipv6_devconf.max_desync_factor, 3787 .maxlen = sizeof(int), 3788 .mode = 0644, 3789 .proc_handler = &proc_dointvec, 3790 }, 3791 #endif 3792 { 3793 .ctl_name = NET_IPV6_MAX_ADDRESSES, 3794 .procname = "max_addresses", 3795 .data = &ipv6_devconf.max_addresses, 3796 .maxlen = sizeof(int), 3797 .mode = 0644, 3798 .proc_handler = &proc_dointvec, 3799 }, 3800 { 3801 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR, 3802 .procname = "accept_ra_defrtr", 3803 .data = &ipv6_devconf.accept_ra_defrtr, 3804 .maxlen = sizeof(int), 3805 .mode = 0644, 3806 .proc_handler = &proc_dointvec, 3807 }, 3808 { 3809 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO, 3810 .procname = "accept_ra_pinfo", 3811 .data = &ipv6_devconf.accept_ra_pinfo, 3812 .maxlen = sizeof(int), 3813 .mode = 0644, 3814 .proc_handler = &proc_dointvec, 3815 }, 3816 #ifdef CONFIG_IPV6_ROUTER_PREF 3817 { 3818 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF, 3819 .procname = "accept_ra_rtr_pref", 3820 .data = &ipv6_devconf.accept_ra_rtr_pref, 3821 .maxlen = sizeof(int), 3822 .mode = 0644, 3823 .proc_handler = &proc_dointvec, 3824 }, 3825 { 3826 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL, 3827 .procname = "router_probe_interval", 3828 .data = &ipv6_devconf.rtr_probe_interval, 3829 .maxlen = sizeof(int), 3830 .mode = 0644, 3831 .proc_handler = &proc_dointvec_jiffies, 3832 .strategy = &sysctl_jiffies, 3833 }, 3834 #ifdef CONFIV_IPV6_ROUTE_INFO 3835 { 3836 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN, 3837 .procname = "accept_ra_rt_info_max_plen", 3838 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 3839 .maxlen = sizeof(int), 3840 .mode = 0644, 3841 .proc_handler = &proc_dointvec, 3842 }, 3843 #endif 3844 #endif 3845 { 3846 .ctl_name = 0, /* sentinel */ 3847 } 3848 }, 3849 .addrconf_dev = { 3850 { 3851 .ctl_name = NET_PROTO_CONF_ALL, 3852 .procname = "all", 3853 .mode = 0555, 3854 .child = addrconf_sysctl.addrconf_vars, 3855 }, 3856 { 3857 .ctl_name = 0, /* sentinel */ 3858 } 3859 }, 3860 .addrconf_conf_dir = { 3861 { 3862 .ctl_name = NET_IPV6_CONF, 3863 .procname = "conf", 3864 .mode = 0555, 3865 .child = addrconf_sysctl.addrconf_dev, 3866 }, 3867 { 3868 .ctl_name = 0, /* sentinel */ 3869 } 3870 }, 3871 .addrconf_proto_dir = { 3872 { 3873 .ctl_name = NET_IPV6, 3874 .procname = "ipv6", 3875 .mode = 0555, 3876 .child = addrconf_sysctl.addrconf_conf_dir, 3877 }, 3878 { 3879 .ctl_name = 0, /* sentinel */ 3880 } 3881 }, 3882 .addrconf_root_dir = { 3883 { 3884 .ctl_name = CTL_NET, 3885 .procname = "net", 3886 .mode = 0555, 3887 .child = addrconf_sysctl.addrconf_proto_dir, 3888 }, 3889 { 3890 .ctl_name = 0, /* sentinel */ 3891 } 3892 }, 3893 }; 3894 3895 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p) 3896 { 3897 int i; 3898 struct net_device *dev = idev ? idev->dev : NULL; 3899 struct addrconf_sysctl_table *t; 3900 char *dev_name = NULL; 3901 3902 t = kmalloc(sizeof(*t), GFP_KERNEL); 3903 if (t == NULL) 3904 return; 3905 memcpy(t, &addrconf_sysctl, sizeof(*t)); 3906 for (i=0; t->addrconf_vars[i].data; i++) { 3907 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf; 3908 t->addrconf_vars[i].de = NULL; 3909 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 3910 } 3911 if (dev) { 3912 dev_name = dev->name; 3913 t->addrconf_dev[0].ctl_name = dev->ifindex; 3914 } else { 3915 dev_name = "default"; 3916 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT; 3917 } 3918 3919 /* 3920 * Make a copy of dev_name, because '.procname' is regarded as const 3921 * by sysctl and we wouldn't want anyone to change it under our feet 3922 * (see SIOCSIFNAME). 3923 */ 3924 dev_name = kstrdup(dev_name, GFP_KERNEL); 3925 if (!dev_name) 3926 goto free; 3927 3928 t->addrconf_dev[0].procname = dev_name; 3929 3930 t->addrconf_dev[0].child = t->addrconf_vars; 3931 t->addrconf_dev[0].de = NULL; 3932 t->addrconf_conf_dir[0].child = t->addrconf_dev; 3933 t->addrconf_conf_dir[0].de = NULL; 3934 t->addrconf_proto_dir[0].child = t->addrconf_conf_dir; 3935 t->addrconf_proto_dir[0].de = NULL; 3936 t->addrconf_root_dir[0].child = t->addrconf_proto_dir; 3937 t->addrconf_root_dir[0].de = NULL; 3938 3939 t->sysctl_header = register_sysctl_table(t->addrconf_root_dir, 0); 3940 if (t->sysctl_header == NULL) 3941 goto free_procname; 3942 else 3943 p->sysctl = t; 3944 return; 3945 3946 /* error path */ 3947 free_procname: 3948 kfree(dev_name); 3949 free: 3950 kfree(t); 3951 3952 return; 3953 } 3954 3955 static void addrconf_sysctl_unregister(struct ipv6_devconf *p) 3956 { 3957 if (p->sysctl) { 3958 struct addrconf_sysctl_table *t = p->sysctl; 3959 p->sysctl = NULL; 3960 unregister_sysctl_table(t->sysctl_header); 3961 kfree(t->addrconf_dev[0].procname); 3962 kfree(t); 3963 } 3964 } 3965 3966 3967 #endif 3968 3969 /* 3970 * Device notifier 3971 */ 3972 3973 int register_inet6addr_notifier(struct notifier_block *nb) 3974 { 3975 return atomic_notifier_chain_register(&inet6addr_chain, nb); 3976 } 3977 3978 int unregister_inet6addr_notifier(struct notifier_block *nb) 3979 { 3980 return atomic_notifier_chain_unregister(&inet6addr_chain,nb); 3981 } 3982 3983 /* 3984 * Init / cleanup code 3985 */ 3986 3987 int __init addrconf_init(void) 3988 { 3989 int err = 0; 3990 3991 /* The addrconf netdev notifier requires that loopback_dev 3992 * has it's ipv6 private information allocated and setup 3993 * before it can bring up and give link-local addresses 3994 * to other devices which are up. 3995 * 3996 * Unfortunately, loopback_dev is not necessarily the first 3997 * entry in the global dev_base list of net devices. In fact, 3998 * it is likely to be the very last entry on that list. 3999 * So this causes the notifier registry below to try and 4000 * give link-local addresses to all devices besides loopback_dev 4001 * first, then loopback_dev, which cases all the non-loopback_dev 4002 * devices to fail to get a link-local address. 4003 * 4004 * So, as a temporary fix, allocate the ipv6 structure for 4005 * loopback_dev first by hand. 4006 * Longer term, all of the dependencies ipv6 has upon the loopback 4007 * device and it being up should be removed. 4008 */ 4009 rtnl_lock(); 4010 if (!ipv6_add_dev(&loopback_dev)) 4011 err = -ENOMEM; 4012 rtnl_unlock(); 4013 if (err) 4014 return err; 4015 4016 ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev); 4017 4018 register_netdevice_notifier(&ipv6_dev_notf); 4019 4020 addrconf_verify(0); 4021 rtnetlink_links[PF_INET6] = inet6_rtnetlink_table; 4022 #ifdef CONFIG_SYSCTL 4023 addrconf_sysctl.sysctl_header = 4024 register_sysctl_table(addrconf_sysctl.addrconf_root_dir, 0); 4025 addrconf_sysctl_register(NULL, &ipv6_devconf_dflt); 4026 #endif 4027 4028 return 0; 4029 } 4030 4031 void __exit addrconf_cleanup(void) 4032 { 4033 struct net_device *dev; 4034 struct inet6_dev *idev; 4035 struct inet6_ifaddr *ifa; 4036 int i; 4037 4038 unregister_netdevice_notifier(&ipv6_dev_notf); 4039 4040 rtnetlink_links[PF_INET6] = NULL; 4041 #ifdef CONFIG_SYSCTL 4042 addrconf_sysctl_unregister(&ipv6_devconf_dflt); 4043 addrconf_sysctl_unregister(&ipv6_devconf); 4044 #endif 4045 4046 rtnl_lock(); 4047 4048 /* 4049 * clean dev list. 4050 */ 4051 4052 for (dev=dev_base; dev; dev=dev->next) { 4053 if ((idev = __in6_dev_get(dev)) == NULL) 4054 continue; 4055 addrconf_ifdown(dev, 1); 4056 } 4057 addrconf_ifdown(&loopback_dev, 2); 4058 4059 /* 4060 * Check hash table. 4061 */ 4062 4063 write_lock_bh(&addrconf_hash_lock); 4064 for (i=0; i < IN6_ADDR_HSIZE; i++) { 4065 for (ifa=inet6_addr_lst[i]; ifa; ) { 4066 struct inet6_ifaddr *bifa; 4067 4068 bifa = ifa; 4069 ifa = ifa->lst_next; 4070 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa); 4071 /* Do not free it; something is wrong. 4072 Now we can investigate it with debugger. 4073 */ 4074 } 4075 } 4076 write_unlock_bh(&addrconf_hash_lock); 4077 4078 del_timer(&addr_chk_timer); 4079 4080 rtnl_unlock(); 4081 4082 #ifdef CONFIG_PROC_FS 4083 proc_net_remove("if_inet6"); 4084 #endif 4085 } 4086