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