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