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 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * as published by the Free Software Foundation; either version 12 * 2 of the License, or (at your option) any later version. 13 */ 14 15 /* 16 * Changes: 17 * 18 * Janos Farkas : delete timer on ifdown 19 * <chexum@bankinf.banki.hu> 20 * Andi Kleen : kill double kfree on module 21 * unload. 22 * Maciej W. Rozycki : FDDI support 23 * sekiya@USAGI : Don't send too many RS 24 * packets. 25 * yoshfuji@USAGI : Fixed interval between DAD 26 * packets. 27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 28 * address validation timer. 29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 30 * support. 31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 32 * address on a same interface. 33 * YOSHIFUJI Hideaki @USAGI : ARCnet support 34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 35 * seq_file. 36 * YOSHIFUJI Hideaki @USAGI : improved source address 37 * selection; consider scope, 38 * status etc. 39 */ 40 41 #define pr_fmt(fmt) "IPv6: " fmt 42 43 #include <linux/errno.h> 44 #include <linux/types.h> 45 #include <linux/kernel.h> 46 #include <linux/sched/signal.h> 47 #include <linux/socket.h> 48 #include <linux/sockios.h> 49 #include <linux/net.h> 50 #include <linux/inet.h> 51 #include <linux/in6.h> 52 #include <linux/netdevice.h> 53 #include <linux/if_addr.h> 54 #include <linux/if_arp.h> 55 #include <linux/if_arcnet.h> 56 #include <linux/if_infiniband.h> 57 #include <linux/route.h> 58 #include <linux/inetdevice.h> 59 #include <linux/init.h> 60 #include <linux/slab.h> 61 #ifdef CONFIG_SYSCTL 62 #include <linux/sysctl.h> 63 #endif 64 #include <linux/capability.h> 65 #include <linux/delay.h> 66 #include <linux/notifier.h> 67 #include <linux/string.h> 68 #include <linux/hash.h> 69 70 #include <net/net_namespace.h> 71 #include <net/sock.h> 72 #include <net/snmp.h> 73 74 #include <net/6lowpan.h> 75 #include <net/firewire.h> 76 #include <net/ipv6.h> 77 #include <net/protocol.h> 78 #include <net/ndisc.h> 79 #include <net/ip6_route.h> 80 #include <net/addrconf.h> 81 #include <net/tcp.h> 82 #include <net/ip.h> 83 #include <net/netlink.h> 84 #include <net/pkt_sched.h> 85 #include <net/l3mdev.h> 86 #include <linux/if_tunnel.h> 87 #include <linux/rtnetlink.h> 88 #include <linux/netconf.h> 89 #include <linux/random.h> 90 #include <linux/uaccess.h> 91 #include <asm/unaligned.h> 92 93 #include <linux/proc_fs.h> 94 #include <linux/seq_file.h> 95 #include <linux/export.h> 96 97 /* Set to 3 to get tracing... */ 98 #define ACONF_DEBUG 2 99 100 #if ACONF_DEBUG >= 3 101 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__) 102 #else 103 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0) 104 #endif 105 106 #define INFINITY_LIFE_TIME 0xFFFFFFFF 107 108 #define IPV6_MAX_STRLEN \ 109 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") 110 111 static inline u32 cstamp_delta(unsigned long cstamp) 112 { 113 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 114 } 115 116 static inline s32 rfc3315_s14_backoff_init(s32 irt) 117 { 118 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */ 119 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt; 120 do_div(tmp, 1000000); 121 return (s32)tmp; 122 } 123 124 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt) 125 { 126 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */ 127 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt; 128 do_div(tmp, 1000000); 129 if ((s32)tmp > mrt) { 130 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */ 131 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt; 132 do_div(tmp, 1000000); 133 } 134 return (s32)tmp; 135 } 136 137 #ifdef CONFIG_SYSCTL 138 static int addrconf_sysctl_register(struct inet6_dev *idev); 139 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 140 #else 141 static inline int addrconf_sysctl_register(struct inet6_dev *idev) 142 { 143 return 0; 144 } 145 146 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 147 { 148 } 149 #endif 150 151 static void ipv6_regen_rndid(struct inet6_dev *idev); 152 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 153 154 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 155 static int ipv6_count_addresses(const struct inet6_dev *idev); 156 static int ipv6_generate_stable_address(struct in6_addr *addr, 157 u8 dad_count, 158 const struct inet6_dev *idev); 159 160 #define IN6_ADDR_HSIZE_SHIFT 8 161 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT) 162 /* 163 * Configured unicast address hash table 164 */ 165 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 166 static DEFINE_SPINLOCK(addrconf_hash_lock); 167 168 static void addrconf_verify(void); 169 static void addrconf_verify_rtnl(void); 170 static void addrconf_verify_work(struct work_struct *); 171 172 static struct workqueue_struct *addrconf_wq; 173 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work); 174 175 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 176 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 177 178 static void addrconf_type_change(struct net_device *dev, 179 unsigned long event); 180 static int addrconf_ifdown(struct net_device *dev, int how); 181 182 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 183 int plen, 184 const struct net_device *dev, 185 u32 flags, u32 noflags); 186 187 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 188 static void addrconf_dad_work(struct work_struct *w); 189 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id); 190 static void addrconf_dad_run(struct inet6_dev *idev); 191 static void addrconf_rs_timer(unsigned long data); 192 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 193 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 194 195 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 196 struct prefix_info *pinfo); 197 198 static struct ipv6_devconf ipv6_devconf __read_mostly = { 199 .forwarding = 0, 200 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 201 .mtu6 = IPV6_MIN_MTU, 202 .accept_ra = 1, 203 .accept_redirects = 1, 204 .autoconf = 1, 205 .force_mld_version = 0, 206 .mldv1_unsolicited_report_interval = 10 * HZ, 207 .mldv2_unsolicited_report_interval = HZ, 208 .dad_transmits = 1, 209 .rtr_solicits = MAX_RTR_SOLICITATIONS, 210 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 211 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 212 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 213 .use_tempaddr = 0, 214 .temp_valid_lft = TEMP_VALID_LIFETIME, 215 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 216 .regen_max_retry = REGEN_MAX_RETRY, 217 .max_desync_factor = MAX_DESYNC_FACTOR, 218 .max_addresses = IPV6_MAX_ADDRESSES, 219 .accept_ra_defrtr = 1, 220 .accept_ra_from_local = 0, 221 .accept_ra_min_hop_limit= 1, 222 .accept_ra_pinfo = 1, 223 #ifdef CONFIG_IPV6_ROUTER_PREF 224 .accept_ra_rtr_pref = 1, 225 .rtr_probe_interval = 60 * HZ, 226 #ifdef CONFIG_IPV6_ROUTE_INFO 227 .accept_ra_rt_info_min_plen = 0, 228 .accept_ra_rt_info_max_plen = 0, 229 #endif 230 #endif 231 .proxy_ndp = 0, 232 .accept_source_route = 0, /* we do not accept RH0 by default. */ 233 .disable_ipv6 = 0, 234 .accept_dad = 1, 235 .suppress_frag_ndisc = 1, 236 .accept_ra_mtu = 1, 237 .stable_secret = { 238 .initialized = false, 239 }, 240 .use_oif_addrs_only = 0, 241 .ignore_routes_with_linkdown = 0, 242 .keep_addr_on_down = 0, 243 .seg6_enabled = 0, 244 #ifdef CONFIG_IPV6_SEG6_HMAC 245 .seg6_require_hmac = 0, 246 #endif 247 .enhanced_dad = 1, 248 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 249 .disable_policy = 0, 250 }; 251 252 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 253 .forwarding = 0, 254 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 255 .mtu6 = IPV6_MIN_MTU, 256 .accept_ra = 1, 257 .accept_redirects = 1, 258 .autoconf = 1, 259 .force_mld_version = 0, 260 .mldv1_unsolicited_report_interval = 10 * HZ, 261 .mldv2_unsolicited_report_interval = HZ, 262 .dad_transmits = 1, 263 .rtr_solicits = MAX_RTR_SOLICITATIONS, 264 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 265 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 266 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 267 .use_tempaddr = 0, 268 .temp_valid_lft = TEMP_VALID_LIFETIME, 269 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 270 .regen_max_retry = REGEN_MAX_RETRY, 271 .max_desync_factor = MAX_DESYNC_FACTOR, 272 .max_addresses = IPV6_MAX_ADDRESSES, 273 .accept_ra_defrtr = 1, 274 .accept_ra_from_local = 0, 275 .accept_ra_min_hop_limit= 1, 276 .accept_ra_pinfo = 1, 277 #ifdef CONFIG_IPV6_ROUTER_PREF 278 .accept_ra_rtr_pref = 1, 279 .rtr_probe_interval = 60 * HZ, 280 #ifdef CONFIG_IPV6_ROUTE_INFO 281 .accept_ra_rt_info_min_plen = 0, 282 .accept_ra_rt_info_max_plen = 0, 283 #endif 284 #endif 285 .proxy_ndp = 0, 286 .accept_source_route = 0, /* we do not accept RH0 by default. */ 287 .disable_ipv6 = 0, 288 .accept_dad = 1, 289 .suppress_frag_ndisc = 1, 290 .accept_ra_mtu = 1, 291 .stable_secret = { 292 .initialized = false, 293 }, 294 .use_oif_addrs_only = 0, 295 .ignore_routes_with_linkdown = 0, 296 .keep_addr_on_down = 0, 297 .seg6_enabled = 0, 298 #ifdef CONFIG_IPV6_SEG6_HMAC 299 .seg6_require_hmac = 0, 300 #endif 301 .enhanced_dad = 1, 302 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 303 .disable_policy = 0, 304 }; 305 306 /* Check if link is ready: is it up and is a valid qdisc available */ 307 static inline bool addrconf_link_ready(const struct net_device *dev) 308 { 309 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev); 310 } 311 312 static void addrconf_del_rs_timer(struct inet6_dev *idev) 313 { 314 if (del_timer(&idev->rs_timer)) 315 __in6_dev_put(idev); 316 } 317 318 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 319 { 320 if (cancel_delayed_work(&ifp->dad_work)) 321 __in6_ifa_put(ifp); 322 } 323 324 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 325 unsigned long when) 326 { 327 if (!timer_pending(&idev->rs_timer)) 328 in6_dev_hold(idev); 329 mod_timer(&idev->rs_timer, jiffies + when); 330 } 331 332 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 333 unsigned long delay) 334 { 335 in6_ifa_hold(ifp); 336 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay)) 337 in6_ifa_put(ifp); 338 } 339 340 static int snmp6_alloc_dev(struct inet6_dev *idev) 341 { 342 int i; 343 344 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib); 345 if (!idev->stats.ipv6) 346 goto err_ip; 347 348 for_each_possible_cpu(i) { 349 struct ipstats_mib *addrconf_stats; 350 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 351 u64_stats_init(&addrconf_stats->syncp); 352 } 353 354 355 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 356 GFP_KERNEL); 357 if (!idev->stats.icmpv6dev) 358 goto err_icmp; 359 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 360 GFP_KERNEL); 361 if (!idev->stats.icmpv6msgdev) 362 goto err_icmpmsg; 363 364 return 0; 365 366 err_icmpmsg: 367 kfree(idev->stats.icmpv6dev); 368 err_icmp: 369 free_percpu(idev->stats.ipv6); 370 err_ip: 371 return -ENOMEM; 372 } 373 374 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 375 { 376 struct inet6_dev *ndev; 377 int err = -ENOMEM; 378 379 ASSERT_RTNL(); 380 381 if (dev->mtu < IPV6_MIN_MTU) 382 return ERR_PTR(-EINVAL); 383 384 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 385 if (!ndev) 386 return ERR_PTR(err); 387 388 rwlock_init(&ndev->lock); 389 ndev->dev = dev; 390 INIT_LIST_HEAD(&ndev->addr_list); 391 setup_timer(&ndev->rs_timer, addrconf_rs_timer, 392 (unsigned long)ndev); 393 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 394 395 if (ndev->cnf.stable_secret.initialized) 396 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 397 else 398 ndev->cnf.addr_gen_mode = ipv6_devconf_dflt.addr_gen_mode; 399 400 ndev->cnf.mtu6 = dev->mtu; 401 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 402 if (!ndev->nd_parms) { 403 kfree(ndev); 404 return ERR_PTR(err); 405 } 406 if (ndev->cnf.forwarding) 407 dev_disable_lro(dev); 408 /* We refer to the device */ 409 dev_hold(dev); 410 411 if (snmp6_alloc_dev(ndev) < 0) { 412 ADBG(KERN_WARNING 413 "%s: cannot allocate memory for statistics; dev=%s.\n", 414 __func__, dev->name); 415 neigh_parms_release(&nd_tbl, ndev->nd_parms); 416 dev_put(dev); 417 kfree(ndev); 418 return ERR_PTR(err); 419 } 420 421 if (snmp6_register_dev(ndev) < 0) { 422 ADBG(KERN_WARNING 423 "%s: cannot create /proc/net/dev_snmp6/%s\n", 424 __func__, dev->name); 425 goto err_release; 426 } 427 428 /* One reference from device. */ 429 refcount_set(&ndev->refcnt, 1); 430 431 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 432 ndev->cnf.accept_dad = -1; 433 434 #if IS_ENABLED(CONFIG_IPV6_SIT) 435 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 436 pr_info("%s: Disabled Multicast RS\n", dev->name); 437 ndev->cnf.rtr_solicits = 0; 438 } 439 #endif 440 441 INIT_LIST_HEAD(&ndev->tempaddr_list); 442 ndev->desync_factor = U32_MAX; 443 if ((dev->flags&IFF_LOOPBACK) || 444 dev->type == ARPHRD_TUNNEL || 445 dev->type == ARPHRD_TUNNEL6 || 446 dev->type == ARPHRD_SIT || 447 dev->type == ARPHRD_NONE) { 448 ndev->cnf.use_tempaddr = -1; 449 } else 450 ipv6_regen_rndid(ndev); 451 452 ndev->token = in6addr_any; 453 454 if (netif_running(dev) && addrconf_link_ready(dev)) 455 ndev->if_flags |= IF_READY; 456 457 ipv6_mc_init_dev(ndev); 458 ndev->tstamp = jiffies; 459 err = addrconf_sysctl_register(ndev); 460 if (err) { 461 ipv6_mc_destroy_dev(ndev); 462 snmp6_unregister_dev(ndev); 463 goto err_release; 464 } 465 /* protected by rtnl_lock */ 466 rcu_assign_pointer(dev->ip6_ptr, ndev); 467 468 /* Join interface-local all-node multicast group */ 469 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 470 471 /* Join all-node multicast group */ 472 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 473 474 /* Join all-router multicast group if forwarding is set */ 475 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 476 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 477 478 return ndev; 479 480 err_release: 481 neigh_parms_release(&nd_tbl, ndev->nd_parms); 482 ndev->dead = 1; 483 in6_dev_finish_destroy(ndev); 484 return ERR_PTR(err); 485 } 486 487 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 488 { 489 struct inet6_dev *idev; 490 491 ASSERT_RTNL(); 492 493 idev = __in6_dev_get(dev); 494 if (!idev) { 495 idev = ipv6_add_dev(dev); 496 if (IS_ERR(idev)) 497 return NULL; 498 } 499 500 if (dev->flags&IFF_UP) 501 ipv6_mc_up(idev); 502 return idev; 503 } 504 505 static int inet6_netconf_msgsize_devconf(int type) 506 { 507 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 508 + nla_total_size(4); /* NETCONFA_IFINDEX */ 509 bool all = false; 510 511 if (type == NETCONFA_ALL) 512 all = true; 513 514 if (all || type == NETCONFA_FORWARDING) 515 size += nla_total_size(4); 516 #ifdef CONFIG_IPV6_MROUTE 517 if (all || type == NETCONFA_MC_FORWARDING) 518 size += nla_total_size(4); 519 #endif 520 if (all || type == NETCONFA_PROXY_NEIGH) 521 size += nla_total_size(4); 522 523 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 524 size += nla_total_size(4); 525 526 return size; 527 } 528 529 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 530 struct ipv6_devconf *devconf, u32 portid, 531 u32 seq, int event, unsigned int flags, 532 int type) 533 { 534 struct nlmsghdr *nlh; 535 struct netconfmsg *ncm; 536 bool all = false; 537 538 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 539 flags); 540 if (!nlh) 541 return -EMSGSIZE; 542 543 if (type == NETCONFA_ALL) 544 all = true; 545 546 ncm = nlmsg_data(nlh); 547 ncm->ncm_family = AF_INET6; 548 549 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 550 goto nla_put_failure; 551 552 if (!devconf) 553 goto out; 554 555 if ((all || type == NETCONFA_FORWARDING) && 556 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 557 goto nla_put_failure; 558 #ifdef CONFIG_IPV6_MROUTE 559 if ((all || type == NETCONFA_MC_FORWARDING) && 560 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 561 devconf->mc_forwarding) < 0) 562 goto nla_put_failure; 563 #endif 564 if ((all || type == NETCONFA_PROXY_NEIGH) && 565 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 566 goto nla_put_failure; 567 568 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 569 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 570 devconf->ignore_routes_with_linkdown) < 0) 571 goto nla_put_failure; 572 573 out: 574 nlmsg_end(skb, nlh); 575 return 0; 576 577 nla_put_failure: 578 nlmsg_cancel(skb, nlh); 579 return -EMSGSIZE; 580 } 581 582 void inet6_netconf_notify_devconf(struct net *net, int event, int type, 583 int ifindex, struct ipv6_devconf *devconf) 584 { 585 struct sk_buff *skb; 586 int err = -ENOBUFS; 587 588 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL); 589 if (!skb) 590 goto errout; 591 592 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 593 event, 0, type); 594 if (err < 0) { 595 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 596 WARN_ON(err == -EMSGSIZE); 597 kfree_skb(skb); 598 goto errout; 599 } 600 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL); 601 return; 602 errout: 603 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 604 } 605 606 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 607 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 608 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 609 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 610 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 611 }; 612 613 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 614 struct nlmsghdr *nlh, 615 struct netlink_ext_ack *extack) 616 { 617 struct net *net = sock_net(in_skb->sk); 618 struct nlattr *tb[NETCONFA_MAX+1]; 619 struct inet6_dev *in6_dev = NULL; 620 struct net_device *dev = NULL; 621 struct netconfmsg *ncm; 622 struct sk_buff *skb; 623 struct ipv6_devconf *devconf; 624 int ifindex; 625 int err; 626 627 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, 628 devconf_ipv6_policy, extack); 629 if (err < 0) 630 return err; 631 632 if (!tb[NETCONFA_IFINDEX]) 633 return -EINVAL; 634 635 err = -EINVAL; 636 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 637 switch (ifindex) { 638 case NETCONFA_IFINDEX_ALL: 639 devconf = net->ipv6.devconf_all; 640 break; 641 case NETCONFA_IFINDEX_DEFAULT: 642 devconf = net->ipv6.devconf_dflt; 643 break; 644 default: 645 dev = dev_get_by_index(net, ifindex); 646 if (!dev) 647 return -EINVAL; 648 in6_dev = in6_dev_get(dev); 649 if (!in6_dev) 650 goto errout; 651 devconf = &in6_dev->cnf; 652 break; 653 } 654 655 err = -ENOBUFS; 656 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); 657 if (!skb) 658 goto errout; 659 660 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 661 NETLINK_CB(in_skb).portid, 662 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 663 NETCONFA_ALL); 664 if (err < 0) { 665 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 666 WARN_ON(err == -EMSGSIZE); 667 kfree_skb(skb); 668 goto errout; 669 } 670 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 671 errout: 672 if (in6_dev) 673 in6_dev_put(in6_dev); 674 if (dev) 675 dev_put(dev); 676 return err; 677 } 678 679 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 680 struct netlink_callback *cb) 681 { 682 struct net *net = sock_net(skb->sk); 683 int h, s_h; 684 int idx, s_idx; 685 struct net_device *dev; 686 struct inet6_dev *idev; 687 struct hlist_head *head; 688 689 s_h = cb->args[0]; 690 s_idx = idx = cb->args[1]; 691 692 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 693 idx = 0; 694 head = &net->dev_index_head[h]; 695 rcu_read_lock(); 696 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 697 net->dev_base_seq; 698 hlist_for_each_entry_rcu(dev, head, index_hlist) { 699 if (idx < s_idx) 700 goto cont; 701 idev = __in6_dev_get(dev); 702 if (!idev) 703 goto cont; 704 705 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 706 &idev->cnf, 707 NETLINK_CB(cb->skb).portid, 708 cb->nlh->nlmsg_seq, 709 RTM_NEWNETCONF, 710 NLM_F_MULTI, 711 NETCONFA_ALL) < 0) { 712 rcu_read_unlock(); 713 goto done; 714 } 715 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 716 cont: 717 idx++; 718 } 719 rcu_read_unlock(); 720 } 721 if (h == NETDEV_HASHENTRIES) { 722 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 723 net->ipv6.devconf_all, 724 NETLINK_CB(cb->skb).portid, 725 cb->nlh->nlmsg_seq, 726 RTM_NEWNETCONF, NLM_F_MULTI, 727 NETCONFA_ALL) < 0) 728 goto done; 729 else 730 h++; 731 } 732 if (h == NETDEV_HASHENTRIES + 1) { 733 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 734 net->ipv6.devconf_dflt, 735 NETLINK_CB(cb->skb).portid, 736 cb->nlh->nlmsg_seq, 737 RTM_NEWNETCONF, NLM_F_MULTI, 738 NETCONFA_ALL) < 0) 739 goto done; 740 else 741 h++; 742 } 743 done: 744 cb->args[0] = h; 745 cb->args[1] = idx; 746 747 return skb->len; 748 } 749 750 #ifdef CONFIG_SYSCTL 751 static void dev_forward_change(struct inet6_dev *idev) 752 { 753 struct net_device *dev; 754 struct inet6_ifaddr *ifa; 755 756 if (!idev) 757 return; 758 dev = idev->dev; 759 if (idev->cnf.forwarding) 760 dev_disable_lro(dev); 761 if (dev->flags & IFF_MULTICAST) { 762 if (idev->cnf.forwarding) { 763 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 764 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 765 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 766 } else { 767 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 768 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 769 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 770 } 771 } 772 773 list_for_each_entry(ifa, &idev->addr_list, if_list) { 774 if (ifa->flags&IFA_F_TENTATIVE) 775 continue; 776 if (idev->cnf.forwarding) 777 addrconf_join_anycast(ifa); 778 else 779 addrconf_leave_anycast(ifa); 780 } 781 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, 782 NETCONFA_FORWARDING, 783 dev->ifindex, &idev->cnf); 784 } 785 786 787 static void addrconf_forward_change(struct net *net, __s32 newf) 788 { 789 struct net_device *dev; 790 struct inet6_dev *idev; 791 792 for_each_netdev(net, dev) { 793 idev = __in6_dev_get(dev); 794 if (idev) { 795 int changed = (!idev->cnf.forwarding) ^ (!newf); 796 idev->cnf.forwarding = newf; 797 if (changed) 798 dev_forward_change(idev); 799 } 800 } 801 } 802 803 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 804 { 805 struct net *net; 806 int old; 807 808 if (!rtnl_trylock()) 809 return restart_syscall(); 810 811 net = (struct net *)table->extra2; 812 old = *p; 813 *p = newf; 814 815 if (p == &net->ipv6.devconf_dflt->forwarding) { 816 if ((!newf) ^ (!old)) 817 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 818 NETCONFA_FORWARDING, 819 NETCONFA_IFINDEX_DEFAULT, 820 net->ipv6.devconf_dflt); 821 rtnl_unlock(); 822 return 0; 823 } 824 825 if (p == &net->ipv6.devconf_all->forwarding) { 826 int old_dflt = net->ipv6.devconf_dflt->forwarding; 827 828 net->ipv6.devconf_dflt->forwarding = newf; 829 if ((!newf) ^ (!old_dflt)) 830 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 831 NETCONFA_FORWARDING, 832 NETCONFA_IFINDEX_DEFAULT, 833 net->ipv6.devconf_dflt); 834 835 addrconf_forward_change(net, newf); 836 if ((!newf) ^ (!old)) 837 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 838 NETCONFA_FORWARDING, 839 NETCONFA_IFINDEX_ALL, 840 net->ipv6.devconf_all); 841 } else if ((!newf) ^ (!old)) 842 dev_forward_change((struct inet6_dev *)table->extra1); 843 rtnl_unlock(); 844 845 if (newf) 846 rt6_purge_dflt_routers(net); 847 return 1; 848 } 849 850 static void addrconf_linkdown_change(struct net *net, __s32 newf) 851 { 852 struct net_device *dev; 853 struct inet6_dev *idev; 854 855 for_each_netdev(net, dev) { 856 idev = __in6_dev_get(dev); 857 if (idev) { 858 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 859 860 idev->cnf.ignore_routes_with_linkdown = newf; 861 if (changed) 862 inet6_netconf_notify_devconf(dev_net(dev), 863 RTM_NEWNETCONF, 864 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 865 dev->ifindex, 866 &idev->cnf); 867 } 868 } 869 } 870 871 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 872 { 873 struct net *net; 874 int old; 875 876 if (!rtnl_trylock()) 877 return restart_syscall(); 878 879 net = (struct net *)table->extra2; 880 old = *p; 881 *p = newf; 882 883 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 884 if ((!newf) ^ (!old)) 885 inet6_netconf_notify_devconf(net, 886 RTM_NEWNETCONF, 887 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 888 NETCONFA_IFINDEX_DEFAULT, 889 net->ipv6.devconf_dflt); 890 rtnl_unlock(); 891 return 0; 892 } 893 894 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 895 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 896 addrconf_linkdown_change(net, newf); 897 if ((!newf) ^ (!old)) 898 inet6_netconf_notify_devconf(net, 899 RTM_NEWNETCONF, 900 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 901 NETCONFA_IFINDEX_ALL, 902 net->ipv6.devconf_all); 903 } 904 rtnl_unlock(); 905 906 return 1; 907 } 908 909 #endif 910 911 /* Nobody refers to this ifaddr, destroy it */ 912 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 913 { 914 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 915 916 #ifdef NET_REFCNT_DEBUG 917 pr_debug("%s\n", __func__); 918 #endif 919 920 in6_dev_put(ifp->idev); 921 922 if (cancel_delayed_work(&ifp->dad_work)) 923 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 924 ifp); 925 926 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 927 pr_warn("Freeing alive inet6 address %p\n", ifp); 928 return; 929 } 930 ip6_rt_put(ifp->rt); 931 932 kfree_rcu(ifp, rcu); 933 } 934 935 static void 936 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 937 { 938 struct list_head *p; 939 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 940 941 /* 942 * Each device address list is sorted in order of scope - 943 * global before linklocal. 944 */ 945 list_for_each(p, &idev->addr_list) { 946 struct inet6_ifaddr *ifa 947 = list_entry(p, struct inet6_ifaddr, if_list); 948 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 949 break; 950 } 951 952 list_add_tail_rcu(&ifp->if_list, p); 953 } 954 955 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr) 956 { 957 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net); 958 959 return hash_32(val, IN6_ADDR_HSIZE_SHIFT); 960 } 961 962 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 963 struct net_device *dev, unsigned int hash) 964 { 965 struct inet6_ifaddr *ifp; 966 967 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 968 if (!net_eq(dev_net(ifp->idev->dev), net)) 969 continue; 970 if (ipv6_addr_equal(&ifp->addr, addr)) { 971 if (!dev || ifp->idev->dev == dev) 972 return true; 973 } 974 } 975 return false; 976 } 977 978 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa) 979 { 980 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr); 981 int err = 0; 982 983 spin_lock(&addrconf_hash_lock); 984 985 /* Ignore adding duplicate addresses on an interface */ 986 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) { 987 ADBG("ipv6_add_addr: already assigned\n"); 988 err = -EEXIST; 989 } else { 990 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 991 } 992 993 spin_unlock(&addrconf_hash_lock); 994 995 return err; 996 } 997 998 /* On success it returns ifp with increased reference count */ 999 1000 static struct inet6_ifaddr * 1001 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 1002 const struct in6_addr *peer_addr, int pfxlen, 1003 int scope, u32 flags, u32 valid_lft, u32 prefered_lft, 1004 bool can_block, struct netlink_ext_ack *extack) 1005 { 1006 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC; 1007 struct net *net = dev_net(idev->dev); 1008 struct inet6_ifaddr *ifa = NULL; 1009 struct rt6_info *rt = NULL; 1010 int err = 0; 1011 int addr_type = ipv6_addr_type(addr); 1012 1013 if (addr_type == IPV6_ADDR_ANY || 1014 addr_type & IPV6_ADDR_MULTICAST || 1015 (!(idev->dev->flags & IFF_LOOPBACK) && 1016 addr_type & IPV6_ADDR_LOOPBACK)) 1017 return ERR_PTR(-EADDRNOTAVAIL); 1018 1019 if (idev->dead) { 1020 err = -ENODEV; /*XXX*/ 1021 goto out; 1022 } 1023 1024 if (idev->cnf.disable_ipv6) { 1025 err = -EACCES; 1026 goto out; 1027 } 1028 1029 /* validator notifier needs to be blocking; 1030 * do not call in atomic context 1031 */ 1032 if (can_block) { 1033 struct in6_validator_info i6vi = { 1034 .i6vi_addr = *addr, 1035 .i6vi_dev = idev, 1036 .extack = extack, 1037 }; 1038 1039 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi); 1040 err = notifier_to_errno(err); 1041 if (err < 0) 1042 goto out; 1043 } 1044 1045 ifa = kzalloc(sizeof(*ifa), gfp_flags); 1046 if (!ifa) { 1047 ADBG("ipv6_add_addr: malloc failed\n"); 1048 err = -ENOBUFS; 1049 goto out; 1050 } 1051 1052 rt = addrconf_dst_alloc(idev, addr, false); 1053 if (IS_ERR(rt)) { 1054 err = PTR_ERR(rt); 1055 rt = NULL; 1056 goto out; 1057 } 1058 1059 if (net->ipv6.devconf_all->disable_policy || 1060 idev->cnf.disable_policy) 1061 rt->dst.flags |= DST_NOPOLICY; 1062 1063 neigh_parms_data_state_setall(idev->nd_parms); 1064 1065 ifa->addr = *addr; 1066 if (peer_addr) 1067 ifa->peer_addr = *peer_addr; 1068 1069 spin_lock_init(&ifa->lock); 1070 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1071 INIT_HLIST_NODE(&ifa->addr_lst); 1072 ifa->scope = scope; 1073 ifa->prefix_len = pfxlen; 1074 ifa->flags = flags; 1075 /* No need to add the TENTATIVE flag for addresses with NODAD */ 1076 if (!(flags & IFA_F_NODAD)) 1077 ifa->flags |= IFA_F_TENTATIVE; 1078 ifa->valid_lft = valid_lft; 1079 ifa->prefered_lft = prefered_lft; 1080 ifa->cstamp = ifa->tstamp = jiffies; 1081 ifa->tokenized = false; 1082 1083 ifa->rt = rt; 1084 1085 ifa->idev = idev; 1086 in6_dev_hold(idev); 1087 1088 /* For caller */ 1089 refcount_set(&ifa->refcnt, 1); 1090 1091 rcu_read_lock_bh(); 1092 1093 err = ipv6_add_addr_hash(idev->dev, ifa); 1094 if (err < 0) { 1095 rcu_read_unlock_bh(); 1096 goto out; 1097 } 1098 1099 write_lock(&idev->lock); 1100 1101 /* Add to inet6_dev unicast addr list. */ 1102 ipv6_link_dev_addr(idev, ifa); 1103 1104 if (ifa->flags&IFA_F_TEMPORARY) { 1105 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1106 in6_ifa_hold(ifa); 1107 } 1108 1109 in6_ifa_hold(ifa); 1110 write_unlock(&idev->lock); 1111 1112 rcu_read_unlock_bh(); 1113 1114 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1115 out: 1116 if (unlikely(err < 0)) { 1117 if (rt) 1118 ip6_rt_put(rt); 1119 if (ifa) { 1120 if (ifa->idev) 1121 in6_dev_put(ifa->idev); 1122 kfree(ifa); 1123 } 1124 ifa = ERR_PTR(err); 1125 } 1126 1127 return ifa; 1128 } 1129 1130 enum cleanup_prefix_rt_t { 1131 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1132 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1133 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1134 }; 1135 1136 /* 1137 * Check, whether the prefix for ifp would still need a prefix route 1138 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1139 * constants. 1140 * 1141 * 1) we don't purge prefix if address was not permanent. 1142 * prefix is managed by its own lifetime. 1143 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1144 * 3) if there are no addresses, delete prefix. 1145 * 4) if there are still other permanent address(es), 1146 * corresponding prefix is still permanent. 1147 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1148 * don't purge the prefix, assume user space is managing it. 1149 * 6) otherwise, update prefix lifetime to the 1150 * longest valid lifetime among the corresponding 1151 * addresses on the device. 1152 * Note: subsequent RA will update lifetime. 1153 **/ 1154 static enum cleanup_prefix_rt_t 1155 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1156 { 1157 struct inet6_ifaddr *ifa; 1158 struct inet6_dev *idev = ifp->idev; 1159 unsigned long lifetime; 1160 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1161 1162 *expires = jiffies; 1163 1164 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1165 if (ifa == ifp) 1166 continue; 1167 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1168 ifp->prefix_len)) 1169 continue; 1170 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1171 return CLEANUP_PREFIX_RT_NOP; 1172 1173 action = CLEANUP_PREFIX_RT_EXPIRE; 1174 1175 spin_lock(&ifa->lock); 1176 1177 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1178 /* 1179 * Note: Because this address is 1180 * not permanent, lifetime < 1181 * LONG_MAX / HZ here. 1182 */ 1183 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1184 *expires = ifa->tstamp + lifetime * HZ; 1185 spin_unlock(&ifa->lock); 1186 } 1187 1188 return action; 1189 } 1190 1191 static void 1192 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt) 1193 { 1194 struct rt6_info *rt; 1195 1196 rt = addrconf_get_prefix_route(&ifp->addr, 1197 ifp->prefix_len, 1198 ifp->idev->dev, 1199 0, RTF_GATEWAY | RTF_DEFAULT); 1200 if (rt) { 1201 if (del_rt) 1202 ip6_del_rt(rt); 1203 else { 1204 if (!(rt->rt6i_flags & RTF_EXPIRES)) 1205 rt6_set_expires(rt, expires); 1206 ip6_rt_put(rt); 1207 } 1208 } 1209 } 1210 1211 1212 /* This function wants to get referenced ifp and releases it before return */ 1213 1214 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1215 { 1216 int state; 1217 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1218 unsigned long expires; 1219 1220 ASSERT_RTNL(); 1221 1222 spin_lock_bh(&ifp->lock); 1223 state = ifp->state; 1224 ifp->state = INET6_IFADDR_STATE_DEAD; 1225 spin_unlock_bh(&ifp->lock); 1226 1227 if (state == INET6_IFADDR_STATE_DEAD) 1228 goto out; 1229 1230 spin_lock_bh(&addrconf_hash_lock); 1231 hlist_del_init_rcu(&ifp->addr_lst); 1232 spin_unlock_bh(&addrconf_hash_lock); 1233 1234 write_lock_bh(&ifp->idev->lock); 1235 1236 if (ifp->flags&IFA_F_TEMPORARY) { 1237 list_del(&ifp->tmp_list); 1238 if (ifp->ifpub) { 1239 in6_ifa_put(ifp->ifpub); 1240 ifp->ifpub = NULL; 1241 } 1242 __in6_ifa_put(ifp); 1243 } 1244 1245 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1246 action = check_cleanup_prefix_route(ifp, &expires); 1247 1248 list_del_rcu(&ifp->if_list); 1249 __in6_ifa_put(ifp); 1250 1251 write_unlock_bh(&ifp->idev->lock); 1252 1253 addrconf_del_dad_work(ifp); 1254 1255 ipv6_ifa_notify(RTM_DELADDR, ifp); 1256 1257 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1258 1259 if (action != CLEANUP_PREFIX_RT_NOP) { 1260 cleanup_prefix_route(ifp, expires, 1261 action == CLEANUP_PREFIX_RT_DEL); 1262 } 1263 1264 /* clean up prefsrc entries */ 1265 rt6_remove_prefsrc(ifp); 1266 out: 1267 in6_ifa_put(ifp); 1268 } 1269 1270 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 1271 { 1272 struct inet6_dev *idev = ifp->idev; 1273 struct in6_addr addr, *tmpaddr; 1274 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 1275 unsigned long regen_advance; 1276 int tmp_plen; 1277 int ret = 0; 1278 u32 addr_flags; 1279 unsigned long now = jiffies; 1280 long max_desync_factor; 1281 s32 cnf_temp_preferred_lft; 1282 1283 write_lock_bh(&idev->lock); 1284 if (ift) { 1285 spin_lock_bh(&ift->lock); 1286 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1287 spin_unlock_bh(&ift->lock); 1288 tmpaddr = &addr; 1289 } else { 1290 tmpaddr = NULL; 1291 } 1292 retry: 1293 in6_dev_hold(idev); 1294 if (idev->cnf.use_tempaddr <= 0) { 1295 write_unlock_bh(&idev->lock); 1296 pr_info("%s: use_tempaddr is disabled\n", __func__); 1297 in6_dev_put(idev); 1298 ret = -1; 1299 goto out; 1300 } 1301 spin_lock_bh(&ifp->lock); 1302 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1303 idev->cnf.use_tempaddr = -1; /*XXX*/ 1304 spin_unlock_bh(&ifp->lock); 1305 write_unlock_bh(&idev->lock); 1306 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1307 __func__); 1308 in6_dev_put(idev); 1309 ret = -1; 1310 goto out; 1311 } 1312 in6_ifa_hold(ifp); 1313 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1314 ipv6_try_regen_rndid(idev, tmpaddr); 1315 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1316 age = (now - ifp->tstamp) / HZ; 1317 1318 regen_advance = idev->cnf.regen_max_retry * 1319 idev->cnf.dad_transmits * 1320 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ; 1321 1322 /* recalculate max_desync_factor each time and update 1323 * idev->desync_factor if it's larger 1324 */ 1325 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1326 max_desync_factor = min_t(__u32, 1327 idev->cnf.max_desync_factor, 1328 cnf_temp_preferred_lft - regen_advance); 1329 1330 if (unlikely(idev->desync_factor > max_desync_factor)) { 1331 if (max_desync_factor > 0) { 1332 get_random_bytes(&idev->desync_factor, 1333 sizeof(idev->desync_factor)); 1334 idev->desync_factor %= max_desync_factor; 1335 } else { 1336 idev->desync_factor = 0; 1337 } 1338 } 1339 1340 tmp_valid_lft = min_t(__u32, 1341 ifp->valid_lft, 1342 idev->cnf.temp_valid_lft + age); 1343 tmp_prefered_lft = cnf_temp_preferred_lft + age - 1344 idev->desync_factor; 1345 tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft); 1346 tmp_plen = ifp->prefix_len; 1347 tmp_tstamp = ifp->tstamp; 1348 spin_unlock_bh(&ifp->lock); 1349 1350 write_unlock_bh(&idev->lock); 1351 1352 /* A temporary address is created only if this calculated Preferred 1353 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1354 * an implementation must not create a temporary address with a zero 1355 * Preferred Lifetime. 1356 * Use age calculation as in addrconf_verify to avoid unnecessary 1357 * temporary addresses being generated. 1358 */ 1359 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1360 if (tmp_prefered_lft <= regen_advance + age) { 1361 in6_ifa_put(ifp); 1362 in6_dev_put(idev); 1363 ret = -1; 1364 goto out; 1365 } 1366 1367 addr_flags = IFA_F_TEMPORARY; 1368 /* set in addrconf_prefix_rcv() */ 1369 if (ifp->flags & IFA_F_OPTIMISTIC) 1370 addr_flags |= IFA_F_OPTIMISTIC; 1371 1372 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen, 1373 ipv6_addr_scope(&addr), addr_flags, 1374 tmp_valid_lft, tmp_prefered_lft, true, NULL); 1375 if (IS_ERR(ift)) { 1376 in6_ifa_put(ifp); 1377 in6_dev_put(idev); 1378 pr_info("%s: retry temporary address regeneration\n", __func__); 1379 tmpaddr = &addr; 1380 write_lock_bh(&idev->lock); 1381 goto retry; 1382 } 1383 1384 spin_lock_bh(&ift->lock); 1385 ift->ifpub = ifp; 1386 ift->cstamp = now; 1387 ift->tstamp = tmp_tstamp; 1388 spin_unlock_bh(&ift->lock); 1389 1390 addrconf_dad_start(ift); 1391 in6_ifa_put(ift); 1392 in6_dev_put(idev); 1393 out: 1394 return ret; 1395 } 1396 1397 /* 1398 * Choose an appropriate source address (RFC3484) 1399 */ 1400 enum { 1401 IPV6_SADDR_RULE_INIT = 0, 1402 IPV6_SADDR_RULE_LOCAL, 1403 IPV6_SADDR_RULE_SCOPE, 1404 IPV6_SADDR_RULE_PREFERRED, 1405 #ifdef CONFIG_IPV6_MIP6 1406 IPV6_SADDR_RULE_HOA, 1407 #endif 1408 IPV6_SADDR_RULE_OIF, 1409 IPV6_SADDR_RULE_LABEL, 1410 IPV6_SADDR_RULE_PRIVACY, 1411 IPV6_SADDR_RULE_ORCHID, 1412 IPV6_SADDR_RULE_PREFIX, 1413 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1414 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1415 #endif 1416 IPV6_SADDR_RULE_MAX 1417 }; 1418 1419 struct ipv6_saddr_score { 1420 int rule; 1421 int addr_type; 1422 struct inet6_ifaddr *ifa; 1423 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1424 int scopedist; 1425 int matchlen; 1426 }; 1427 1428 struct ipv6_saddr_dst { 1429 const struct in6_addr *addr; 1430 int ifindex; 1431 int scope; 1432 int label; 1433 unsigned int prefs; 1434 }; 1435 1436 static inline int ipv6_saddr_preferred(int type) 1437 { 1438 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1439 return 1; 1440 return 0; 1441 } 1442 1443 static bool ipv6_use_optimistic_addr(struct net *net, 1444 struct inet6_dev *idev) 1445 { 1446 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1447 if (!idev) 1448 return false; 1449 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1450 return false; 1451 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic) 1452 return false; 1453 1454 return true; 1455 #else 1456 return false; 1457 #endif 1458 } 1459 1460 static int ipv6_get_saddr_eval(struct net *net, 1461 struct ipv6_saddr_score *score, 1462 struct ipv6_saddr_dst *dst, 1463 int i) 1464 { 1465 int ret; 1466 1467 if (i <= score->rule) { 1468 switch (i) { 1469 case IPV6_SADDR_RULE_SCOPE: 1470 ret = score->scopedist; 1471 break; 1472 case IPV6_SADDR_RULE_PREFIX: 1473 ret = score->matchlen; 1474 break; 1475 default: 1476 ret = !!test_bit(i, score->scorebits); 1477 } 1478 goto out; 1479 } 1480 1481 switch (i) { 1482 case IPV6_SADDR_RULE_INIT: 1483 /* Rule 0: remember if hiscore is not ready yet */ 1484 ret = !!score->ifa; 1485 break; 1486 case IPV6_SADDR_RULE_LOCAL: 1487 /* Rule 1: Prefer same address */ 1488 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1489 break; 1490 case IPV6_SADDR_RULE_SCOPE: 1491 /* Rule 2: Prefer appropriate scope 1492 * 1493 * ret 1494 * ^ 1495 * -1 | d 15 1496 * ---+--+-+---> scope 1497 * | 1498 * | d is scope of the destination. 1499 * B-d | \ 1500 * | \ <- smaller scope is better if 1501 * B-15 | \ if scope is enough for destination. 1502 * | ret = B - scope (-1 <= scope >= d <= 15). 1503 * d-C-1 | / 1504 * |/ <- greater is better 1505 * -C / if scope is not enough for destination. 1506 * /| ret = scope - C (-1 <= d < scope <= 15). 1507 * 1508 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1509 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1510 * Assume B = 0 and we get C > 29. 1511 */ 1512 ret = __ipv6_addr_src_scope(score->addr_type); 1513 if (ret >= dst->scope) 1514 ret = -ret; 1515 else 1516 ret -= 128; /* 30 is enough */ 1517 score->scopedist = ret; 1518 break; 1519 case IPV6_SADDR_RULE_PREFERRED: 1520 { 1521 /* Rule 3: Avoid deprecated and optimistic addresses */ 1522 u8 avoid = IFA_F_DEPRECATED; 1523 1524 if (!ipv6_use_optimistic_addr(net, score->ifa->idev)) 1525 avoid |= IFA_F_OPTIMISTIC; 1526 ret = ipv6_saddr_preferred(score->addr_type) || 1527 !(score->ifa->flags & avoid); 1528 break; 1529 } 1530 #ifdef CONFIG_IPV6_MIP6 1531 case IPV6_SADDR_RULE_HOA: 1532 { 1533 /* Rule 4: Prefer home address */ 1534 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1535 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1536 break; 1537 } 1538 #endif 1539 case IPV6_SADDR_RULE_OIF: 1540 /* Rule 5: Prefer outgoing interface */ 1541 ret = (!dst->ifindex || 1542 dst->ifindex == score->ifa->idev->dev->ifindex); 1543 break; 1544 case IPV6_SADDR_RULE_LABEL: 1545 /* Rule 6: Prefer matching label */ 1546 ret = ipv6_addr_label(net, 1547 &score->ifa->addr, score->addr_type, 1548 score->ifa->idev->dev->ifindex) == dst->label; 1549 break; 1550 case IPV6_SADDR_RULE_PRIVACY: 1551 { 1552 /* Rule 7: Prefer public address 1553 * Note: prefer temporary address if use_tempaddr >= 2 1554 */ 1555 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1556 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1557 score->ifa->idev->cnf.use_tempaddr >= 2; 1558 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1559 break; 1560 } 1561 case IPV6_SADDR_RULE_ORCHID: 1562 /* Rule 8-: Prefer ORCHID vs ORCHID or 1563 * non-ORCHID vs non-ORCHID 1564 */ 1565 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1566 ipv6_addr_orchid(dst->addr)); 1567 break; 1568 case IPV6_SADDR_RULE_PREFIX: 1569 /* Rule 8: Use longest matching prefix */ 1570 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1571 if (ret > score->ifa->prefix_len) 1572 ret = score->ifa->prefix_len; 1573 score->matchlen = ret; 1574 break; 1575 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1576 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1577 /* Optimistic addresses still have lower precedence than other 1578 * preferred addresses. 1579 */ 1580 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1581 break; 1582 #endif 1583 default: 1584 ret = 0; 1585 } 1586 1587 if (ret) 1588 __set_bit(i, score->scorebits); 1589 score->rule = i; 1590 out: 1591 return ret; 1592 } 1593 1594 static int __ipv6_dev_get_saddr(struct net *net, 1595 struct ipv6_saddr_dst *dst, 1596 struct inet6_dev *idev, 1597 struct ipv6_saddr_score *scores, 1598 int hiscore_idx) 1599 { 1600 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1601 1602 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) { 1603 int i; 1604 1605 /* 1606 * - Tentative Address (RFC2462 section 5.4) 1607 * - A tentative address is not considered 1608 * "assigned to an interface" in the traditional 1609 * sense, unless it is also flagged as optimistic. 1610 * - Candidate Source Address (section 4) 1611 * - In any case, anycast addresses, multicast 1612 * addresses, and the unspecified address MUST 1613 * NOT be included in a candidate set. 1614 */ 1615 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1616 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1617 continue; 1618 1619 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1620 1621 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1622 score->addr_type & IPV6_ADDR_MULTICAST)) { 1623 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1624 idev->dev->name); 1625 continue; 1626 } 1627 1628 score->rule = -1; 1629 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1630 1631 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1632 int minihiscore, miniscore; 1633 1634 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1635 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1636 1637 if (minihiscore > miniscore) { 1638 if (i == IPV6_SADDR_RULE_SCOPE && 1639 score->scopedist > 0) { 1640 /* 1641 * special case: 1642 * each remaining entry 1643 * has too small (not enough) 1644 * scope, because ifa entries 1645 * are sorted by their scope 1646 * values. 1647 */ 1648 goto out; 1649 } 1650 break; 1651 } else if (minihiscore < miniscore) { 1652 swap(hiscore, score); 1653 hiscore_idx = 1 - hiscore_idx; 1654 1655 /* restore our iterator */ 1656 score->ifa = hiscore->ifa; 1657 1658 break; 1659 } 1660 } 1661 } 1662 out: 1663 return hiscore_idx; 1664 } 1665 1666 static int ipv6_get_saddr_master(struct net *net, 1667 const struct net_device *dst_dev, 1668 const struct net_device *master, 1669 struct ipv6_saddr_dst *dst, 1670 struct ipv6_saddr_score *scores, 1671 int hiscore_idx) 1672 { 1673 struct inet6_dev *idev; 1674 1675 idev = __in6_dev_get(dst_dev); 1676 if (idev) 1677 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1678 scores, hiscore_idx); 1679 1680 idev = __in6_dev_get(master); 1681 if (idev) 1682 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1683 scores, hiscore_idx); 1684 1685 return hiscore_idx; 1686 } 1687 1688 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1689 const struct in6_addr *daddr, unsigned int prefs, 1690 struct in6_addr *saddr) 1691 { 1692 struct ipv6_saddr_score scores[2], *hiscore; 1693 struct ipv6_saddr_dst dst; 1694 struct inet6_dev *idev; 1695 struct net_device *dev; 1696 int dst_type; 1697 bool use_oif_addr = false; 1698 int hiscore_idx = 0; 1699 int ret = 0; 1700 1701 dst_type = __ipv6_addr_type(daddr); 1702 dst.addr = daddr; 1703 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1704 dst.scope = __ipv6_addr_src_scope(dst_type); 1705 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1706 dst.prefs = prefs; 1707 1708 scores[hiscore_idx].rule = -1; 1709 scores[hiscore_idx].ifa = NULL; 1710 1711 rcu_read_lock(); 1712 1713 /* Candidate Source Address (section 4) 1714 * - multicast and link-local destination address, 1715 * the set of candidate source address MUST only 1716 * include addresses assigned to interfaces 1717 * belonging to the same link as the outgoing 1718 * interface. 1719 * (- For site-local destination addresses, the 1720 * set of candidate source addresses MUST only 1721 * include addresses assigned to interfaces 1722 * belonging to the same site as the outgoing 1723 * interface.) 1724 * - "It is RECOMMENDED that the candidate source addresses 1725 * be the set of unicast addresses assigned to the 1726 * interface that will be used to send to the destination 1727 * (the 'outgoing' interface)." (RFC 6724) 1728 */ 1729 if (dst_dev) { 1730 idev = __in6_dev_get(dst_dev); 1731 if ((dst_type & IPV6_ADDR_MULTICAST) || 1732 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1733 (idev && idev->cnf.use_oif_addrs_only)) { 1734 use_oif_addr = true; 1735 } 1736 } 1737 1738 if (use_oif_addr) { 1739 if (idev) 1740 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1741 } else { 1742 const struct net_device *master; 1743 int master_idx = 0; 1744 1745 /* if dst_dev exists and is enslaved to an L3 device, then 1746 * prefer addresses from dst_dev and then the master over 1747 * any other enslaved devices in the L3 domain. 1748 */ 1749 master = l3mdev_master_dev_rcu(dst_dev); 1750 if (master) { 1751 master_idx = master->ifindex; 1752 1753 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1754 master, &dst, 1755 scores, hiscore_idx); 1756 1757 if (scores[hiscore_idx].ifa) 1758 goto out; 1759 } 1760 1761 for_each_netdev_rcu(net, dev) { 1762 /* only consider addresses on devices in the 1763 * same L3 domain 1764 */ 1765 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1766 continue; 1767 idev = __in6_dev_get(dev); 1768 if (!idev) 1769 continue; 1770 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1771 } 1772 } 1773 1774 out: 1775 hiscore = &scores[hiscore_idx]; 1776 if (!hiscore->ifa) 1777 ret = -EADDRNOTAVAIL; 1778 else 1779 *saddr = hiscore->ifa->addr; 1780 1781 rcu_read_unlock(); 1782 return ret; 1783 } 1784 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1785 1786 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1787 u32 banned_flags) 1788 { 1789 struct inet6_ifaddr *ifp; 1790 int err = -EADDRNOTAVAIL; 1791 1792 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1793 if (ifp->scope > IFA_LINK) 1794 break; 1795 if (ifp->scope == IFA_LINK && 1796 !(ifp->flags & banned_flags)) { 1797 *addr = ifp->addr; 1798 err = 0; 1799 break; 1800 } 1801 } 1802 return err; 1803 } 1804 1805 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1806 u32 banned_flags) 1807 { 1808 struct inet6_dev *idev; 1809 int err = -EADDRNOTAVAIL; 1810 1811 rcu_read_lock(); 1812 idev = __in6_dev_get(dev); 1813 if (idev) { 1814 read_lock_bh(&idev->lock); 1815 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1816 read_unlock_bh(&idev->lock); 1817 } 1818 rcu_read_unlock(); 1819 return err; 1820 } 1821 1822 static int ipv6_count_addresses(const struct inet6_dev *idev) 1823 { 1824 const struct inet6_ifaddr *ifp; 1825 int cnt = 0; 1826 1827 rcu_read_lock(); 1828 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list) 1829 cnt++; 1830 rcu_read_unlock(); 1831 return cnt; 1832 } 1833 1834 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1835 const struct net_device *dev, int strict) 1836 { 1837 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE); 1838 } 1839 EXPORT_SYMBOL(ipv6_chk_addr); 1840 1841 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1842 const struct net_device *dev, int strict, 1843 u32 banned_flags) 1844 { 1845 unsigned int hash = inet6_addr_hash(net, addr); 1846 struct inet6_ifaddr *ifp; 1847 u32 ifp_flags; 1848 1849 rcu_read_lock(); 1850 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1851 if (!net_eq(dev_net(ifp->idev->dev), net)) 1852 continue; 1853 /* Decouple optimistic from tentative for evaluation here. 1854 * Ban optimistic addresses explicitly, when required. 1855 */ 1856 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1857 ? (ifp->flags&~IFA_F_TENTATIVE) 1858 : ifp->flags; 1859 if (ipv6_addr_equal(&ifp->addr, addr) && 1860 !(ifp_flags&banned_flags) && 1861 (!dev || ifp->idev->dev == dev || 1862 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1863 rcu_read_unlock(); 1864 return 1; 1865 } 1866 } 1867 1868 rcu_read_unlock(); 1869 return 0; 1870 } 1871 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1872 1873 1874 /* Compares an address/prefix_len with addresses on device @dev. 1875 * If one is found it returns true. 1876 */ 1877 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1878 const unsigned int prefix_len, struct net_device *dev) 1879 { 1880 const struct inet6_ifaddr *ifa; 1881 const struct inet6_dev *idev; 1882 bool ret = false; 1883 1884 rcu_read_lock(); 1885 idev = __in6_dev_get(dev); 1886 if (idev) { 1887 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1888 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1889 if (ret) 1890 break; 1891 } 1892 } 1893 rcu_read_unlock(); 1894 1895 return ret; 1896 } 1897 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1898 1899 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1900 { 1901 const struct inet6_ifaddr *ifa; 1902 const struct inet6_dev *idev; 1903 int onlink; 1904 1905 onlink = 0; 1906 rcu_read_lock(); 1907 idev = __in6_dev_get(dev); 1908 if (idev) { 1909 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1910 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1911 ifa->prefix_len); 1912 if (onlink) 1913 break; 1914 } 1915 } 1916 rcu_read_unlock(); 1917 return onlink; 1918 } 1919 EXPORT_SYMBOL(ipv6_chk_prefix); 1920 1921 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1922 struct net_device *dev, int strict) 1923 { 1924 unsigned int hash = inet6_addr_hash(net, addr); 1925 struct inet6_ifaddr *ifp, *result = NULL; 1926 1927 rcu_read_lock(); 1928 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1929 if (!net_eq(dev_net(ifp->idev->dev), net)) 1930 continue; 1931 if (ipv6_addr_equal(&ifp->addr, addr)) { 1932 if (!dev || ifp->idev->dev == dev || 1933 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1934 result = ifp; 1935 in6_ifa_hold(ifp); 1936 break; 1937 } 1938 } 1939 } 1940 rcu_read_unlock(); 1941 1942 return result; 1943 } 1944 1945 /* Gets referenced address, destroys ifaddr */ 1946 1947 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1948 { 1949 if (dad_failed) 1950 ifp->flags |= IFA_F_DADFAILED; 1951 1952 if (ifp->flags&IFA_F_TEMPORARY) { 1953 struct inet6_ifaddr *ifpub; 1954 spin_lock_bh(&ifp->lock); 1955 ifpub = ifp->ifpub; 1956 if (ifpub) { 1957 in6_ifa_hold(ifpub); 1958 spin_unlock_bh(&ifp->lock); 1959 ipv6_create_tempaddr(ifpub, ifp); 1960 in6_ifa_put(ifpub); 1961 } else { 1962 spin_unlock_bh(&ifp->lock); 1963 } 1964 ipv6_del_addr(ifp); 1965 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) { 1966 spin_lock_bh(&ifp->lock); 1967 addrconf_del_dad_work(ifp); 1968 ifp->flags |= IFA_F_TENTATIVE; 1969 spin_unlock_bh(&ifp->lock); 1970 if (dad_failed) 1971 ipv6_ifa_notify(0, ifp); 1972 in6_ifa_put(ifp); 1973 } else { 1974 ipv6_del_addr(ifp); 1975 } 1976 } 1977 1978 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1979 { 1980 int err = -ENOENT; 1981 1982 spin_lock_bh(&ifp->lock); 1983 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1984 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1985 err = 0; 1986 } 1987 spin_unlock_bh(&ifp->lock); 1988 1989 return err; 1990 } 1991 1992 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp) 1993 { 1994 struct inet6_dev *idev = ifp->idev; 1995 struct net *net = dev_net(ifp->idev->dev); 1996 1997 if (addrconf_dad_end(ifp)) { 1998 in6_ifa_put(ifp); 1999 return; 2000 } 2001 2002 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n", 2003 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source); 2004 2005 spin_lock_bh(&ifp->lock); 2006 2007 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 2008 int scope = ifp->scope; 2009 u32 flags = ifp->flags; 2010 struct in6_addr new_addr; 2011 struct inet6_ifaddr *ifp2; 2012 u32 valid_lft, preferred_lft; 2013 int pfxlen = ifp->prefix_len; 2014 int retries = ifp->stable_privacy_retry + 1; 2015 2016 if (retries > net->ipv6.sysctl.idgen_retries) { 2017 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 2018 ifp->idev->dev->name); 2019 goto errdad; 2020 } 2021 2022 new_addr = ifp->addr; 2023 if (ipv6_generate_stable_address(&new_addr, retries, 2024 idev)) 2025 goto errdad; 2026 2027 valid_lft = ifp->valid_lft; 2028 preferred_lft = ifp->prefered_lft; 2029 2030 spin_unlock_bh(&ifp->lock); 2031 2032 if (idev->cnf.max_addresses && 2033 ipv6_count_addresses(idev) >= 2034 idev->cnf.max_addresses) 2035 goto lock_errdad; 2036 2037 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 2038 ifp->idev->dev->name); 2039 2040 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen, 2041 scope, flags, valid_lft, 2042 preferred_lft, false, NULL); 2043 if (IS_ERR(ifp2)) 2044 goto lock_errdad; 2045 2046 spin_lock_bh(&ifp2->lock); 2047 ifp2->stable_privacy_retry = retries; 2048 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2049 spin_unlock_bh(&ifp2->lock); 2050 2051 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2052 in6_ifa_put(ifp2); 2053 lock_errdad: 2054 spin_lock_bh(&ifp->lock); 2055 } 2056 2057 errdad: 2058 /* transition from _POSTDAD to _ERRDAD */ 2059 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2060 spin_unlock_bh(&ifp->lock); 2061 2062 addrconf_mod_dad_work(ifp, 0); 2063 in6_ifa_put(ifp); 2064 } 2065 2066 /* Join to solicited addr multicast group. 2067 * caller must hold RTNL */ 2068 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2069 { 2070 struct in6_addr maddr; 2071 2072 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2073 return; 2074 2075 addrconf_addr_solict_mult(addr, &maddr); 2076 ipv6_dev_mc_inc(dev, &maddr); 2077 } 2078 2079 /* caller must hold RTNL */ 2080 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2081 { 2082 struct in6_addr maddr; 2083 2084 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2085 return; 2086 2087 addrconf_addr_solict_mult(addr, &maddr); 2088 __ipv6_dev_mc_dec(idev, &maddr); 2089 } 2090 2091 /* caller must hold RTNL */ 2092 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2093 { 2094 struct in6_addr addr; 2095 2096 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2097 return; 2098 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2099 if (ipv6_addr_any(&addr)) 2100 return; 2101 __ipv6_dev_ac_inc(ifp->idev, &addr); 2102 } 2103 2104 /* caller must hold RTNL */ 2105 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2106 { 2107 struct in6_addr addr; 2108 2109 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2110 return; 2111 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2112 if (ipv6_addr_any(&addr)) 2113 return; 2114 __ipv6_dev_ac_dec(ifp->idev, &addr); 2115 } 2116 2117 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2118 { 2119 switch (dev->addr_len) { 2120 case ETH_ALEN: 2121 memcpy(eui, dev->dev_addr, 3); 2122 eui[3] = 0xFF; 2123 eui[4] = 0xFE; 2124 memcpy(eui + 5, dev->dev_addr + 3, 3); 2125 break; 2126 case EUI64_ADDR_LEN: 2127 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2128 eui[0] ^= 2; 2129 break; 2130 default: 2131 return -1; 2132 } 2133 2134 return 0; 2135 } 2136 2137 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2138 { 2139 union fwnet_hwaddr *ha; 2140 2141 if (dev->addr_len != FWNET_ALEN) 2142 return -1; 2143 2144 ha = (union fwnet_hwaddr *)dev->dev_addr; 2145 2146 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2147 eui[0] ^= 2; 2148 return 0; 2149 } 2150 2151 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2152 { 2153 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2154 if (dev->addr_len != ARCNET_ALEN) 2155 return -1; 2156 memset(eui, 0, 7); 2157 eui[7] = *(u8 *)dev->dev_addr; 2158 return 0; 2159 } 2160 2161 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2162 { 2163 if (dev->addr_len != INFINIBAND_ALEN) 2164 return -1; 2165 memcpy(eui, dev->dev_addr + 12, 8); 2166 eui[0] |= 2; 2167 return 0; 2168 } 2169 2170 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2171 { 2172 if (addr == 0) 2173 return -1; 2174 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2175 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2176 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2177 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2178 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2179 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2180 eui[1] = 0; 2181 eui[2] = 0x5E; 2182 eui[3] = 0xFE; 2183 memcpy(eui + 4, &addr, 4); 2184 return 0; 2185 } 2186 2187 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2188 { 2189 if (dev->priv_flags & IFF_ISATAP) 2190 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2191 return -1; 2192 } 2193 2194 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2195 { 2196 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2197 } 2198 2199 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2200 { 2201 memcpy(eui, dev->perm_addr, 3); 2202 memcpy(eui + 5, dev->perm_addr + 3, 3); 2203 eui[3] = 0xFF; 2204 eui[4] = 0xFE; 2205 eui[0] ^= 2; 2206 return 0; 2207 } 2208 2209 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2210 { 2211 switch (dev->type) { 2212 case ARPHRD_ETHER: 2213 case ARPHRD_FDDI: 2214 return addrconf_ifid_eui48(eui, dev); 2215 case ARPHRD_ARCNET: 2216 return addrconf_ifid_arcnet(eui, dev); 2217 case ARPHRD_INFINIBAND: 2218 return addrconf_ifid_infiniband(eui, dev); 2219 case ARPHRD_SIT: 2220 return addrconf_ifid_sit(eui, dev); 2221 case ARPHRD_IPGRE: 2222 case ARPHRD_TUNNEL: 2223 return addrconf_ifid_gre(eui, dev); 2224 case ARPHRD_6LOWPAN: 2225 return addrconf_ifid_6lowpan(eui, dev); 2226 case ARPHRD_IEEE1394: 2227 return addrconf_ifid_ieee1394(eui, dev); 2228 case ARPHRD_TUNNEL6: 2229 case ARPHRD_IP6GRE: 2230 return addrconf_ifid_ip6tnl(eui, dev); 2231 } 2232 return -1; 2233 } 2234 2235 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2236 { 2237 int err = -1; 2238 struct inet6_ifaddr *ifp; 2239 2240 read_lock_bh(&idev->lock); 2241 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2242 if (ifp->scope > IFA_LINK) 2243 break; 2244 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2245 memcpy(eui, ifp->addr.s6_addr+8, 8); 2246 err = 0; 2247 break; 2248 } 2249 } 2250 read_unlock_bh(&idev->lock); 2251 return err; 2252 } 2253 2254 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 2255 static void ipv6_regen_rndid(struct inet6_dev *idev) 2256 { 2257 regen: 2258 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 2259 idev->rndid[0] &= ~0x02; 2260 2261 /* 2262 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 2263 * check if generated address is not inappropriate 2264 * 2265 * - Reserved subnet anycast (RFC 2526) 2266 * 11111101 11....11 1xxxxxxx 2267 * - ISATAP (RFC4214) 6.1 2268 * 00-00-5E-FE-xx-xx-xx-xx 2269 * - value 0 2270 * - XXX: already assigned to an address on the device 2271 */ 2272 if (idev->rndid[0] == 0xfd && 2273 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 2274 (idev->rndid[7]&0x80)) 2275 goto regen; 2276 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 2277 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 2278 goto regen; 2279 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 2280 goto regen; 2281 } 2282 } 2283 2284 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 2285 { 2286 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 2287 ipv6_regen_rndid(idev); 2288 } 2289 2290 /* 2291 * Add prefix route. 2292 */ 2293 2294 static void 2295 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 2296 unsigned long expires, u32 flags) 2297 { 2298 struct fib6_config cfg = { 2299 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2300 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2301 .fc_ifindex = dev->ifindex, 2302 .fc_expires = expires, 2303 .fc_dst_len = plen, 2304 .fc_flags = RTF_UP | flags, 2305 .fc_nlinfo.nl_net = dev_net(dev), 2306 .fc_protocol = RTPROT_KERNEL, 2307 }; 2308 2309 cfg.fc_dst = *pfx; 2310 2311 /* Prevent useless cloning on PtP SIT. 2312 This thing is done here expecting that the whole 2313 class of non-broadcast devices need not cloning. 2314 */ 2315 #if IS_ENABLED(CONFIG_IPV6_SIT) 2316 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2317 cfg.fc_flags |= RTF_NONEXTHOP; 2318 #endif 2319 2320 ip6_route_add(&cfg, NULL); 2321 } 2322 2323 2324 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2325 int plen, 2326 const struct net_device *dev, 2327 u32 flags, u32 noflags) 2328 { 2329 struct fib6_node *fn; 2330 struct rt6_info *rt = NULL; 2331 struct fib6_table *table; 2332 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2333 2334 table = fib6_get_table(dev_net(dev), tb_id); 2335 if (!table) 2336 return NULL; 2337 2338 rcu_read_lock(); 2339 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true); 2340 if (!fn) 2341 goto out; 2342 2343 for_each_fib6_node_rt_rcu(fn) { 2344 if (rt->dst.dev->ifindex != dev->ifindex) 2345 continue; 2346 if ((rt->rt6i_flags & flags) != flags) 2347 continue; 2348 if ((rt->rt6i_flags & noflags) != 0) 2349 continue; 2350 if (!dst_hold_safe(&rt->dst)) 2351 rt = NULL; 2352 break; 2353 } 2354 out: 2355 rcu_read_unlock(); 2356 return rt; 2357 } 2358 2359 2360 /* Create "default" multicast route to the interface */ 2361 2362 static void addrconf_add_mroute(struct net_device *dev) 2363 { 2364 struct fib6_config cfg = { 2365 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2366 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2367 .fc_ifindex = dev->ifindex, 2368 .fc_dst_len = 8, 2369 .fc_flags = RTF_UP, 2370 .fc_nlinfo.nl_net = dev_net(dev), 2371 }; 2372 2373 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2374 2375 ip6_route_add(&cfg, NULL); 2376 } 2377 2378 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2379 { 2380 struct inet6_dev *idev; 2381 2382 ASSERT_RTNL(); 2383 2384 idev = ipv6_find_idev(dev); 2385 if (!idev) 2386 return ERR_PTR(-ENOBUFS); 2387 2388 if (idev->cnf.disable_ipv6) 2389 return ERR_PTR(-EACCES); 2390 2391 /* Add default multicast route */ 2392 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2393 addrconf_add_mroute(dev); 2394 2395 return idev; 2396 } 2397 2398 static void manage_tempaddrs(struct inet6_dev *idev, 2399 struct inet6_ifaddr *ifp, 2400 __u32 valid_lft, __u32 prefered_lft, 2401 bool create, unsigned long now) 2402 { 2403 u32 flags; 2404 struct inet6_ifaddr *ift; 2405 2406 read_lock_bh(&idev->lock); 2407 /* update all temporary addresses in the list */ 2408 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2409 int age, max_valid, max_prefered; 2410 2411 if (ifp != ift->ifpub) 2412 continue; 2413 2414 /* RFC 4941 section 3.3: 2415 * If a received option will extend the lifetime of a public 2416 * address, the lifetimes of temporary addresses should 2417 * be extended, subject to the overall constraint that no 2418 * temporary addresses should ever remain "valid" or "preferred" 2419 * for a time longer than (TEMP_VALID_LIFETIME) or 2420 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2421 */ 2422 age = (now - ift->cstamp) / HZ; 2423 max_valid = idev->cnf.temp_valid_lft - age; 2424 if (max_valid < 0) 2425 max_valid = 0; 2426 2427 max_prefered = idev->cnf.temp_prefered_lft - 2428 idev->desync_factor - age; 2429 if (max_prefered < 0) 2430 max_prefered = 0; 2431 2432 if (valid_lft > max_valid) 2433 valid_lft = max_valid; 2434 2435 if (prefered_lft > max_prefered) 2436 prefered_lft = max_prefered; 2437 2438 spin_lock(&ift->lock); 2439 flags = ift->flags; 2440 ift->valid_lft = valid_lft; 2441 ift->prefered_lft = prefered_lft; 2442 ift->tstamp = now; 2443 if (prefered_lft > 0) 2444 ift->flags &= ~IFA_F_DEPRECATED; 2445 2446 spin_unlock(&ift->lock); 2447 if (!(flags&IFA_F_TENTATIVE)) 2448 ipv6_ifa_notify(0, ift); 2449 } 2450 2451 if ((create || list_empty(&idev->tempaddr_list)) && 2452 idev->cnf.use_tempaddr > 0) { 2453 /* When a new public address is created as described 2454 * in [ADDRCONF], also create a new temporary address. 2455 * Also create a temporary address if it's enabled but 2456 * no temporary address currently exists. 2457 */ 2458 read_unlock_bh(&idev->lock); 2459 ipv6_create_tempaddr(ifp, NULL); 2460 } else { 2461 read_unlock_bh(&idev->lock); 2462 } 2463 } 2464 2465 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2466 { 2467 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2468 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2469 } 2470 2471 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2472 const struct prefix_info *pinfo, 2473 struct inet6_dev *in6_dev, 2474 const struct in6_addr *addr, int addr_type, 2475 u32 addr_flags, bool sllao, bool tokenized, 2476 __u32 valid_lft, u32 prefered_lft) 2477 { 2478 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2479 int create = 0, update_lft = 0; 2480 2481 if (!ifp && valid_lft) { 2482 int max_addresses = in6_dev->cnf.max_addresses; 2483 2484 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2485 if ((net->ipv6.devconf_all->optimistic_dad || 2486 in6_dev->cnf.optimistic_dad) && 2487 !net->ipv6.devconf_all->forwarding && sllao) 2488 addr_flags |= IFA_F_OPTIMISTIC; 2489 #endif 2490 2491 /* Do not allow to create too much of autoconfigured 2492 * addresses; this would be too easy way to crash kernel. 2493 */ 2494 if (!max_addresses || 2495 ipv6_count_addresses(in6_dev) < max_addresses) 2496 ifp = ipv6_add_addr(in6_dev, addr, NULL, 2497 pinfo->prefix_len, 2498 addr_type&IPV6_ADDR_SCOPE_MASK, 2499 addr_flags, valid_lft, 2500 prefered_lft, false, NULL); 2501 2502 if (IS_ERR_OR_NULL(ifp)) 2503 return -1; 2504 2505 update_lft = 0; 2506 create = 1; 2507 spin_lock_bh(&ifp->lock); 2508 ifp->flags |= IFA_F_MANAGETEMPADDR; 2509 ifp->cstamp = jiffies; 2510 ifp->tokenized = tokenized; 2511 spin_unlock_bh(&ifp->lock); 2512 addrconf_dad_start(ifp); 2513 } 2514 2515 if (ifp) { 2516 u32 flags; 2517 unsigned long now; 2518 u32 stored_lft; 2519 2520 /* update lifetime (RFC2462 5.5.3 e) */ 2521 spin_lock_bh(&ifp->lock); 2522 now = jiffies; 2523 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2524 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2525 else 2526 stored_lft = 0; 2527 if (!update_lft && !create && stored_lft) { 2528 const u32 minimum_lft = min_t(u32, 2529 stored_lft, MIN_VALID_LIFETIME); 2530 valid_lft = max(valid_lft, minimum_lft); 2531 2532 /* RFC4862 Section 5.5.3e: 2533 * "Note that the preferred lifetime of the 2534 * corresponding address is always reset to 2535 * the Preferred Lifetime in the received 2536 * Prefix Information option, regardless of 2537 * whether the valid lifetime is also reset or 2538 * ignored." 2539 * 2540 * So we should always update prefered_lft here. 2541 */ 2542 update_lft = 1; 2543 } 2544 2545 if (update_lft) { 2546 ifp->valid_lft = valid_lft; 2547 ifp->prefered_lft = prefered_lft; 2548 ifp->tstamp = now; 2549 flags = ifp->flags; 2550 ifp->flags &= ~IFA_F_DEPRECATED; 2551 spin_unlock_bh(&ifp->lock); 2552 2553 if (!(flags&IFA_F_TENTATIVE)) 2554 ipv6_ifa_notify(0, ifp); 2555 } else 2556 spin_unlock_bh(&ifp->lock); 2557 2558 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2559 create, now); 2560 2561 in6_ifa_put(ifp); 2562 addrconf_verify(); 2563 } 2564 2565 return 0; 2566 } 2567 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2568 2569 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2570 { 2571 struct prefix_info *pinfo; 2572 __u32 valid_lft; 2573 __u32 prefered_lft; 2574 int addr_type, err; 2575 u32 addr_flags = 0; 2576 struct inet6_dev *in6_dev; 2577 struct net *net = dev_net(dev); 2578 2579 pinfo = (struct prefix_info *) opt; 2580 2581 if (len < sizeof(struct prefix_info)) { 2582 ADBG("addrconf: prefix option too short\n"); 2583 return; 2584 } 2585 2586 /* 2587 * Validation checks ([ADDRCONF], page 19) 2588 */ 2589 2590 addr_type = ipv6_addr_type(&pinfo->prefix); 2591 2592 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2593 return; 2594 2595 valid_lft = ntohl(pinfo->valid); 2596 prefered_lft = ntohl(pinfo->prefered); 2597 2598 if (prefered_lft > valid_lft) { 2599 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2600 return; 2601 } 2602 2603 in6_dev = in6_dev_get(dev); 2604 2605 if (!in6_dev) { 2606 net_dbg_ratelimited("addrconf: device %s not configured\n", 2607 dev->name); 2608 return; 2609 } 2610 2611 /* 2612 * Two things going on here: 2613 * 1) Add routes for on-link prefixes 2614 * 2) Configure prefixes with the auto flag set 2615 */ 2616 2617 if (pinfo->onlink) { 2618 struct rt6_info *rt; 2619 unsigned long rt_expires; 2620 2621 /* Avoid arithmetic overflow. Really, we could 2622 * save rt_expires in seconds, likely valid_lft, 2623 * but it would require division in fib gc, that it 2624 * not good. 2625 */ 2626 if (HZ > USER_HZ) 2627 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2628 else 2629 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2630 2631 if (addrconf_finite_timeout(rt_expires)) 2632 rt_expires *= HZ; 2633 2634 rt = addrconf_get_prefix_route(&pinfo->prefix, 2635 pinfo->prefix_len, 2636 dev, 2637 RTF_ADDRCONF | RTF_PREFIX_RT, 2638 RTF_GATEWAY | RTF_DEFAULT); 2639 2640 if (rt) { 2641 /* Autoconf prefix route */ 2642 if (valid_lft == 0) { 2643 ip6_del_rt(rt); 2644 rt = NULL; 2645 } else if (addrconf_finite_timeout(rt_expires)) { 2646 /* not infinity */ 2647 rt6_set_expires(rt, jiffies + rt_expires); 2648 } else { 2649 rt6_clean_expires(rt); 2650 } 2651 } else if (valid_lft) { 2652 clock_t expires = 0; 2653 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2654 if (addrconf_finite_timeout(rt_expires)) { 2655 /* not infinity */ 2656 flags |= RTF_EXPIRES; 2657 expires = jiffies_to_clock_t(rt_expires); 2658 } 2659 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2660 dev, expires, flags); 2661 } 2662 ip6_rt_put(rt); 2663 } 2664 2665 /* Try to figure out our local address for this prefix */ 2666 2667 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2668 struct in6_addr addr; 2669 bool tokenized = false, dev_addr_generated = false; 2670 2671 if (pinfo->prefix_len == 64) { 2672 memcpy(&addr, &pinfo->prefix, 8); 2673 2674 if (!ipv6_addr_any(&in6_dev->token)) { 2675 read_lock_bh(&in6_dev->lock); 2676 memcpy(addr.s6_addr + 8, 2677 in6_dev->token.s6_addr + 8, 8); 2678 read_unlock_bh(&in6_dev->lock); 2679 tokenized = true; 2680 } else if (is_addr_mode_generate_stable(in6_dev) && 2681 !ipv6_generate_stable_address(&addr, 0, 2682 in6_dev)) { 2683 addr_flags |= IFA_F_STABLE_PRIVACY; 2684 goto ok; 2685 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2686 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2687 goto put; 2688 } else { 2689 dev_addr_generated = true; 2690 } 2691 goto ok; 2692 } 2693 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2694 pinfo->prefix_len); 2695 goto put; 2696 2697 ok: 2698 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2699 &addr, addr_type, 2700 addr_flags, sllao, 2701 tokenized, valid_lft, 2702 prefered_lft); 2703 if (err) 2704 goto put; 2705 2706 /* Ignore error case here because previous prefix add addr was 2707 * successful which will be notified. 2708 */ 2709 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2710 addr_type, addr_flags, sllao, 2711 tokenized, valid_lft, 2712 prefered_lft, 2713 dev_addr_generated); 2714 } 2715 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2716 put: 2717 in6_dev_put(in6_dev); 2718 } 2719 2720 /* 2721 * Set destination address. 2722 * Special case for SIT interfaces where we create a new "virtual" 2723 * device. 2724 */ 2725 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2726 { 2727 struct in6_ifreq ireq; 2728 struct net_device *dev; 2729 int err = -EINVAL; 2730 2731 rtnl_lock(); 2732 2733 err = -EFAULT; 2734 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2735 goto err_exit; 2736 2737 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2738 2739 err = -ENODEV; 2740 if (!dev) 2741 goto err_exit; 2742 2743 #if IS_ENABLED(CONFIG_IPV6_SIT) 2744 if (dev->type == ARPHRD_SIT) { 2745 const struct net_device_ops *ops = dev->netdev_ops; 2746 struct ifreq ifr; 2747 struct ip_tunnel_parm p; 2748 2749 err = -EADDRNOTAVAIL; 2750 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2751 goto err_exit; 2752 2753 memset(&p, 0, sizeof(p)); 2754 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2755 p.iph.saddr = 0; 2756 p.iph.version = 4; 2757 p.iph.ihl = 5; 2758 p.iph.protocol = IPPROTO_IPV6; 2759 p.iph.ttl = 64; 2760 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2761 2762 if (ops->ndo_do_ioctl) { 2763 mm_segment_t oldfs = get_fs(); 2764 2765 set_fs(KERNEL_DS); 2766 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2767 set_fs(oldfs); 2768 } else 2769 err = -EOPNOTSUPP; 2770 2771 if (err == 0) { 2772 err = -ENOBUFS; 2773 dev = __dev_get_by_name(net, p.name); 2774 if (!dev) 2775 goto err_exit; 2776 err = dev_open(dev); 2777 } 2778 } 2779 #endif 2780 2781 err_exit: 2782 rtnl_unlock(); 2783 return err; 2784 } 2785 2786 static int ipv6_mc_config(struct sock *sk, bool join, 2787 const struct in6_addr *addr, int ifindex) 2788 { 2789 int ret; 2790 2791 ASSERT_RTNL(); 2792 2793 lock_sock(sk); 2794 if (join) 2795 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2796 else 2797 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2798 release_sock(sk); 2799 2800 return ret; 2801 } 2802 2803 /* 2804 * Manual configuration of address on an interface 2805 */ 2806 static int inet6_addr_add(struct net *net, int ifindex, 2807 const struct in6_addr *pfx, 2808 const struct in6_addr *peer_pfx, 2809 unsigned int plen, __u32 ifa_flags, 2810 __u32 prefered_lft, __u32 valid_lft, 2811 struct netlink_ext_ack *extack) 2812 { 2813 struct inet6_ifaddr *ifp; 2814 struct inet6_dev *idev; 2815 struct net_device *dev; 2816 unsigned long timeout; 2817 clock_t expires; 2818 int scope; 2819 u32 flags; 2820 2821 ASSERT_RTNL(); 2822 2823 if (plen > 128) 2824 return -EINVAL; 2825 2826 /* check the lifetime */ 2827 if (!valid_lft || prefered_lft > valid_lft) 2828 return -EINVAL; 2829 2830 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64) 2831 return -EINVAL; 2832 2833 dev = __dev_get_by_index(net, ifindex); 2834 if (!dev) 2835 return -ENODEV; 2836 2837 idev = addrconf_add_dev(dev); 2838 if (IS_ERR(idev)) 2839 return PTR_ERR(idev); 2840 2841 if (ifa_flags & IFA_F_MCAUTOJOIN) { 2842 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2843 true, pfx, ifindex); 2844 2845 if (ret < 0) 2846 return ret; 2847 } 2848 2849 scope = ipv6_addr_scope(pfx); 2850 2851 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2852 if (addrconf_finite_timeout(timeout)) { 2853 expires = jiffies_to_clock_t(timeout * HZ); 2854 valid_lft = timeout; 2855 flags = RTF_EXPIRES; 2856 } else { 2857 expires = 0; 2858 flags = 0; 2859 ifa_flags |= IFA_F_PERMANENT; 2860 } 2861 2862 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2863 if (addrconf_finite_timeout(timeout)) { 2864 if (timeout == 0) 2865 ifa_flags |= IFA_F_DEPRECATED; 2866 prefered_lft = timeout; 2867 } 2868 2869 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags, 2870 valid_lft, prefered_lft, true, extack); 2871 2872 if (!IS_ERR(ifp)) { 2873 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 2874 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2875 expires, flags); 2876 } 2877 2878 /* 2879 * Note that section 3.1 of RFC 4429 indicates 2880 * that the Optimistic flag should not be set for 2881 * manually configured addresses 2882 */ 2883 addrconf_dad_start(ifp); 2884 if (ifa_flags & IFA_F_MANAGETEMPADDR) 2885 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft, 2886 true, jiffies); 2887 in6_ifa_put(ifp); 2888 addrconf_verify_rtnl(); 2889 return 0; 2890 } else if (ifa_flags & IFA_F_MCAUTOJOIN) { 2891 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2892 false, pfx, ifindex); 2893 } 2894 2895 return PTR_ERR(ifp); 2896 } 2897 2898 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2899 const struct in6_addr *pfx, unsigned int plen) 2900 { 2901 struct inet6_ifaddr *ifp; 2902 struct inet6_dev *idev; 2903 struct net_device *dev; 2904 2905 if (plen > 128) 2906 return -EINVAL; 2907 2908 dev = __dev_get_by_index(net, ifindex); 2909 if (!dev) 2910 return -ENODEV; 2911 2912 idev = __in6_dev_get(dev); 2913 if (!idev) 2914 return -ENXIO; 2915 2916 read_lock_bh(&idev->lock); 2917 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2918 if (ifp->prefix_len == plen && 2919 ipv6_addr_equal(pfx, &ifp->addr)) { 2920 in6_ifa_hold(ifp); 2921 read_unlock_bh(&idev->lock); 2922 2923 if (!(ifp->flags & IFA_F_TEMPORARY) && 2924 (ifa_flags & IFA_F_MANAGETEMPADDR)) 2925 manage_tempaddrs(idev, ifp, 0, 0, false, 2926 jiffies); 2927 ipv6_del_addr(ifp); 2928 addrconf_verify_rtnl(); 2929 if (ipv6_addr_is_multicast(pfx)) { 2930 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2931 false, pfx, dev->ifindex); 2932 } 2933 return 0; 2934 } 2935 } 2936 read_unlock_bh(&idev->lock); 2937 return -EADDRNOTAVAIL; 2938 } 2939 2940 2941 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2942 { 2943 struct in6_ifreq ireq; 2944 int err; 2945 2946 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2947 return -EPERM; 2948 2949 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2950 return -EFAULT; 2951 2952 rtnl_lock(); 2953 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL, 2954 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2955 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME, NULL); 2956 rtnl_unlock(); 2957 return err; 2958 } 2959 2960 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2961 { 2962 struct in6_ifreq ireq; 2963 int err; 2964 2965 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2966 return -EPERM; 2967 2968 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2969 return -EFAULT; 2970 2971 rtnl_lock(); 2972 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 2973 ireq.ifr6_prefixlen); 2974 rtnl_unlock(); 2975 return err; 2976 } 2977 2978 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2979 int plen, int scope) 2980 { 2981 struct inet6_ifaddr *ifp; 2982 2983 ifp = ipv6_add_addr(idev, addr, NULL, plen, 2984 scope, IFA_F_PERMANENT, 2985 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME, 2986 true, NULL); 2987 if (!IS_ERR(ifp)) { 2988 spin_lock_bh(&ifp->lock); 2989 ifp->flags &= ~IFA_F_TENTATIVE; 2990 spin_unlock_bh(&ifp->lock); 2991 rt_genid_bump_ipv6(dev_net(idev->dev)); 2992 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2993 in6_ifa_put(ifp); 2994 } 2995 } 2996 2997 #if IS_ENABLED(CONFIG_IPV6_SIT) 2998 static void sit_add_v4_addrs(struct inet6_dev *idev) 2999 { 3000 struct in6_addr addr; 3001 struct net_device *dev; 3002 struct net *net = dev_net(idev->dev); 3003 int scope, plen; 3004 u32 pflags = 0; 3005 3006 ASSERT_RTNL(); 3007 3008 memset(&addr, 0, sizeof(struct in6_addr)); 3009 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 3010 3011 if (idev->dev->flags&IFF_POINTOPOINT) { 3012 addr.s6_addr32[0] = htonl(0xfe800000); 3013 scope = IFA_LINK; 3014 plen = 64; 3015 } else { 3016 scope = IPV6_ADDR_COMPATv4; 3017 plen = 96; 3018 pflags |= RTF_NONEXTHOP; 3019 } 3020 3021 if (addr.s6_addr32[3]) { 3022 add_addr(idev, &addr, plen, scope); 3023 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags); 3024 return; 3025 } 3026 3027 for_each_netdev(net, dev) { 3028 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3029 if (in_dev && (dev->flags & IFF_UP)) { 3030 struct in_ifaddr *ifa; 3031 3032 int flag = scope; 3033 3034 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 3035 3036 addr.s6_addr32[3] = ifa->ifa_local; 3037 3038 if (ifa->ifa_scope == RT_SCOPE_LINK) 3039 continue; 3040 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3041 if (idev->dev->flags&IFF_POINTOPOINT) 3042 continue; 3043 flag |= IFA_HOST; 3044 } 3045 3046 add_addr(idev, &addr, plen, flag); 3047 addrconf_prefix_route(&addr, plen, idev->dev, 0, 3048 pflags); 3049 } 3050 } 3051 } 3052 } 3053 #endif 3054 3055 static void init_loopback(struct net_device *dev) 3056 { 3057 struct inet6_dev *idev; 3058 3059 /* ::1 */ 3060 3061 ASSERT_RTNL(); 3062 3063 idev = ipv6_find_idev(dev); 3064 if (!idev) { 3065 pr_debug("%s: add_dev failed\n", __func__); 3066 return; 3067 } 3068 3069 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 3070 } 3071 3072 void addrconf_add_linklocal(struct inet6_dev *idev, 3073 const struct in6_addr *addr, u32 flags) 3074 { 3075 struct inet6_ifaddr *ifp; 3076 u32 addr_flags = flags | IFA_F_PERMANENT; 3077 3078 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3079 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad || 3080 idev->cnf.optimistic_dad) && 3081 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3082 addr_flags |= IFA_F_OPTIMISTIC; 3083 #endif 3084 3085 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 3086 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME, true, NULL); 3087 if (!IS_ERR(ifp)) { 3088 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 3089 addrconf_dad_start(ifp); 3090 in6_ifa_put(ifp); 3091 } 3092 } 3093 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3094 3095 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3096 { 3097 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3098 return true; 3099 3100 if (address.s6_addr32[2] == htonl(0x02005eff) && 3101 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3102 return true; 3103 3104 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3105 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3106 return true; 3107 3108 return false; 3109 } 3110 3111 static int ipv6_generate_stable_address(struct in6_addr *address, 3112 u8 dad_count, 3113 const struct inet6_dev *idev) 3114 { 3115 static DEFINE_SPINLOCK(lock); 3116 static __u32 digest[SHA_DIGEST_WORDS]; 3117 static __u32 workspace[SHA_WORKSPACE_WORDS]; 3118 3119 static union { 3120 char __data[SHA_MESSAGE_BYTES]; 3121 struct { 3122 struct in6_addr secret; 3123 __be32 prefix[2]; 3124 unsigned char hwaddr[MAX_ADDR_LEN]; 3125 u8 dad_count; 3126 } __packed; 3127 } data; 3128 3129 struct in6_addr secret; 3130 struct in6_addr temp; 3131 struct net *net = dev_net(idev->dev); 3132 3133 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3134 3135 if (idev->cnf.stable_secret.initialized) 3136 secret = idev->cnf.stable_secret.secret; 3137 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3138 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3139 else 3140 return -1; 3141 3142 retry: 3143 spin_lock_bh(&lock); 3144 3145 sha_init(digest); 3146 memset(&data, 0, sizeof(data)); 3147 memset(workspace, 0, sizeof(workspace)); 3148 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3149 data.prefix[0] = address->s6_addr32[0]; 3150 data.prefix[1] = address->s6_addr32[1]; 3151 data.secret = secret; 3152 data.dad_count = dad_count; 3153 3154 sha_transform(digest, data.__data, workspace); 3155 3156 temp = *address; 3157 temp.s6_addr32[2] = (__force __be32)digest[0]; 3158 temp.s6_addr32[3] = (__force __be32)digest[1]; 3159 3160 spin_unlock_bh(&lock); 3161 3162 if (ipv6_reserved_interfaceid(temp)) { 3163 dad_count++; 3164 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3165 return -1; 3166 goto retry; 3167 } 3168 3169 *address = temp; 3170 return 0; 3171 } 3172 3173 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3174 { 3175 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3176 3177 if (s->initialized) 3178 return; 3179 s = &idev->cnf.stable_secret; 3180 get_random_bytes(&s->secret, sizeof(s->secret)); 3181 s->initialized = true; 3182 } 3183 3184 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3185 { 3186 struct in6_addr addr; 3187 3188 /* no link local addresses on L3 master devices */ 3189 if (netif_is_l3_master(idev->dev)) 3190 return; 3191 3192 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3193 3194 switch (idev->cnf.addr_gen_mode) { 3195 case IN6_ADDR_GEN_MODE_RANDOM: 3196 ipv6_gen_mode_random_init(idev); 3197 /* fallthrough */ 3198 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3199 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3200 addrconf_add_linklocal(idev, &addr, 3201 IFA_F_STABLE_PRIVACY); 3202 else if (prefix_route) 3203 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3204 break; 3205 case IN6_ADDR_GEN_MODE_EUI64: 3206 /* addrconf_add_linklocal also adds a prefix_route and we 3207 * only need to care about prefix routes if ipv6_generate_eui64 3208 * couldn't generate one. 3209 */ 3210 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3211 addrconf_add_linklocal(idev, &addr, 0); 3212 else if (prefix_route) 3213 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3214 break; 3215 case IN6_ADDR_GEN_MODE_NONE: 3216 default: 3217 /* will not add any link local address */ 3218 break; 3219 } 3220 } 3221 3222 static void addrconf_dev_config(struct net_device *dev) 3223 { 3224 struct inet6_dev *idev; 3225 3226 ASSERT_RTNL(); 3227 3228 if ((dev->type != ARPHRD_ETHER) && 3229 (dev->type != ARPHRD_FDDI) && 3230 (dev->type != ARPHRD_ARCNET) && 3231 (dev->type != ARPHRD_INFINIBAND) && 3232 (dev->type != ARPHRD_IEEE1394) && 3233 (dev->type != ARPHRD_TUNNEL6) && 3234 (dev->type != ARPHRD_6LOWPAN) && 3235 (dev->type != ARPHRD_IP6GRE) && 3236 (dev->type != ARPHRD_IPGRE) && 3237 (dev->type != ARPHRD_TUNNEL) && 3238 (dev->type != ARPHRD_NONE)) { 3239 /* Alas, we support only Ethernet autoconfiguration. */ 3240 return; 3241 } 3242 3243 idev = addrconf_add_dev(dev); 3244 if (IS_ERR(idev)) 3245 return; 3246 3247 /* this device type has no EUI support */ 3248 if (dev->type == ARPHRD_NONE && 3249 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3250 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3251 3252 addrconf_addr_gen(idev, false); 3253 } 3254 3255 #if IS_ENABLED(CONFIG_IPV6_SIT) 3256 static void addrconf_sit_config(struct net_device *dev) 3257 { 3258 struct inet6_dev *idev; 3259 3260 ASSERT_RTNL(); 3261 3262 /* 3263 * Configure the tunnel with one of our IPv4 3264 * addresses... we should configure all of 3265 * our v4 addrs in the tunnel 3266 */ 3267 3268 idev = ipv6_find_idev(dev); 3269 if (!idev) { 3270 pr_debug("%s: add_dev failed\n", __func__); 3271 return; 3272 } 3273 3274 if (dev->priv_flags & IFF_ISATAP) { 3275 addrconf_addr_gen(idev, false); 3276 return; 3277 } 3278 3279 sit_add_v4_addrs(idev); 3280 3281 if (dev->flags&IFF_POINTOPOINT) 3282 addrconf_add_mroute(dev); 3283 } 3284 #endif 3285 3286 #if IS_ENABLED(CONFIG_NET_IPGRE) 3287 static void addrconf_gre_config(struct net_device *dev) 3288 { 3289 struct inet6_dev *idev; 3290 3291 ASSERT_RTNL(); 3292 3293 idev = ipv6_find_idev(dev); 3294 if (!idev) { 3295 pr_debug("%s: add_dev failed\n", __func__); 3296 return; 3297 } 3298 3299 addrconf_addr_gen(idev, true); 3300 if (dev->flags & IFF_POINTOPOINT) 3301 addrconf_add_mroute(dev); 3302 } 3303 #endif 3304 3305 static int fixup_permanent_addr(struct inet6_dev *idev, 3306 struct inet6_ifaddr *ifp) 3307 { 3308 /* !rt6i_node means the host route was removed from the 3309 * FIB, for example, if 'lo' device is taken down. In that 3310 * case regenerate the host route. 3311 */ 3312 if (!ifp->rt || !ifp->rt->rt6i_node) { 3313 struct rt6_info *rt, *prev; 3314 3315 rt = addrconf_dst_alloc(idev, &ifp->addr, false); 3316 if (IS_ERR(rt)) 3317 return PTR_ERR(rt); 3318 3319 /* ifp->rt can be accessed outside of rtnl */ 3320 spin_lock(&ifp->lock); 3321 prev = ifp->rt; 3322 ifp->rt = rt; 3323 spin_unlock(&ifp->lock); 3324 3325 ip6_rt_put(prev); 3326 } 3327 3328 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3329 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3330 idev->dev, 0, 0); 3331 } 3332 3333 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3334 addrconf_dad_start(ifp); 3335 3336 return 0; 3337 } 3338 3339 static void addrconf_permanent_addr(struct net_device *dev) 3340 { 3341 struct inet6_ifaddr *ifp, *tmp; 3342 struct inet6_dev *idev; 3343 3344 idev = __in6_dev_get(dev); 3345 if (!idev) 3346 return; 3347 3348 write_lock_bh(&idev->lock); 3349 3350 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3351 if ((ifp->flags & IFA_F_PERMANENT) && 3352 fixup_permanent_addr(idev, ifp) < 0) { 3353 write_unlock_bh(&idev->lock); 3354 in6_ifa_hold(ifp); 3355 ipv6_del_addr(ifp); 3356 write_lock_bh(&idev->lock); 3357 3358 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3359 idev->dev->name, &ifp->addr); 3360 } 3361 } 3362 3363 write_unlock_bh(&idev->lock); 3364 } 3365 3366 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3367 void *ptr) 3368 { 3369 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3370 struct netdev_notifier_changeupper_info *info; 3371 struct inet6_dev *idev = __in6_dev_get(dev); 3372 struct net *net = dev_net(dev); 3373 int run_pending = 0; 3374 int err; 3375 3376 switch (event) { 3377 case NETDEV_REGISTER: 3378 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3379 idev = ipv6_add_dev(dev); 3380 if (IS_ERR(idev)) 3381 return notifier_from_errno(PTR_ERR(idev)); 3382 } 3383 break; 3384 3385 case NETDEV_CHANGEMTU: 3386 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3387 if (dev->mtu < IPV6_MIN_MTU) { 3388 addrconf_ifdown(dev, dev != net->loopback_dev); 3389 break; 3390 } 3391 3392 if (idev) { 3393 rt6_mtu_change(dev, dev->mtu); 3394 idev->cnf.mtu6 = dev->mtu; 3395 break; 3396 } 3397 3398 /* allocate new idev */ 3399 idev = ipv6_add_dev(dev); 3400 if (IS_ERR(idev)) 3401 break; 3402 3403 /* device is still not ready */ 3404 if (!(idev->if_flags & IF_READY)) 3405 break; 3406 3407 run_pending = 1; 3408 3409 /* fall through */ 3410 3411 case NETDEV_UP: 3412 case NETDEV_CHANGE: 3413 if (dev->flags & IFF_SLAVE) 3414 break; 3415 3416 if (idev && idev->cnf.disable_ipv6) 3417 break; 3418 3419 if (event == NETDEV_UP) { 3420 /* restore routes for permanent addresses */ 3421 addrconf_permanent_addr(dev); 3422 3423 if (!addrconf_link_ready(dev)) { 3424 /* device is not ready yet. */ 3425 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3426 dev->name); 3427 break; 3428 } 3429 3430 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3431 idev = ipv6_add_dev(dev); 3432 3433 if (!IS_ERR_OR_NULL(idev)) { 3434 idev->if_flags |= IF_READY; 3435 run_pending = 1; 3436 } 3437 } else if (event == NETDEV_CHANGE) { 3438 if (!addrconf_link_ready(dev)) { 3439 /* device is still not ready. */ 3440 break; 3441 } 3442 3443 if (idev) { 3444 if (idev->if_flags & IF_READY) { 3445 /* device is already configured - 3446 * but resend MLD reports, we might 3447 * have roamed and need to update 3448 * multicast snooping switches 3449 */ 3450 ipv6_mc_up(idev); 3451 break; 3452 } 3453 idev->if_flags |= IF_READY; 3454 } 3455 3456 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3457 dev->name); 3458 3459 run_pending = 1; 3460 } 3461 3462 switch (dev->type) { 3463 #if IS_ENABLED(CONFIG_IPV6_SIT) 3464 case ARPHRD_SIT: 3465 addrconf_sit_config(dev); 3466 break; 3467 #endif 3468 #if IS_ENABLED(CONFIG_NET_IPGRE) 3469 case ARPHRD_IPGRE: 3470 addrconf_gre_config(dev); 3471 break; 3472 #endif 3473 case ARPHRD_LOOPBACK: 3474 init_loopback(dev); 3475 break; 3476 3477 default: 3478 addrconf_dev_config(dev); 3479 break; 3480 } 3481 3482 if (!IS_ERR_OR_NULL(idev)) { 3483 if (run_pending) 3484 addrconf_dad_run(idev); 3485 3486 /* 3487 * If the MTU changed during the interface down, 3488 * when the interface up, the changed MTU must be 3489 * reflected in the idev as well as routers. 3490 */ 3491 if (idev->cnf.mtu6 != dev->mtu && 3492 dev->mtu >= IPV6_MIN_MTU) { 3493 rt6_mtu_change(dev, dev->mtu); 3494 idev->cnf.mtu6 = dev->mtu; 3495 } 3496 idev->tstamp = jiffies; 3497 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3498 3499 /* 3500 * If the changed mtu during down is lower than 3501 * IPV6_MIN_MTU stop IPv6 on this interface. 3502 */ 3503 if (dev->mtu < IPV6_MIN_MTU) 3504 addrconf_ifdown(dev, dev != net->loopback_dev); 3505 } 3506 break; 3507 3508 case NETDEV_DOWN: 3509 case NETDEV_UNREGISTER: 3510 /* 3511 * Remove all addresses from this interface. 3512 */ 3513 addrconf_ifdown(dev, event != NETDEV_DOWN); 3514 break; 3515 3516 case NETDEV_CHANGENAME: 3517 if (idev) { 3518 snmp6_unregister_dev(idev); 3519 addrconf_sysctl_unregister(idev); 3520 err = addrconf_sysctl_register(idev); 3521 if (err) 3522 return notifier_from_errno(err); 3523 err = snmp6_register_dev(idev); 3524 if (err) { 3525 addrconf_sysctl_unregister(idev); 3526 return notifier_from_errno(err); 3527 } 3528 } 3529 break; 3530 3531 case NETDEV_PRE_TYPE_CHANGE: 3532 case NETDEV_POST_TYPE_CHANGE: 3533 if (idev) 3534 addrconf_type_change(dev, event); 3535 break; 3536 3537 case NETDEV_CHANGEUPPER: 3538 info = ptr; 3539 3540 /* flush all routes if dev is linked to or unlinked from 3541 * an L3 master device (e.g., VRF) 3542 */ 3543 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3544 addrconf_ifdown(dev, 0); 3545 } 3546 3547 return NOTIFY_OK; 3548 } 3549 3550 /* 3551 * addrconf module should be notified of a device going up 3552 */ 3553 static struct notifier_block ipv6_dev_notf = { 3554 .notifier_call = addrconf_notify, 3555 .priority = ADDRCONF_NOTIFY_PRIORITY, 3556 }; 3557 3558 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3559 { 3560 struct inet6_dev *idev; 3561 ASSERT_RTNL(); 3562 3563 idev = __in6_dev_get(dev); 3564 3565 if (event == NETDEV_POST_TYPE_CHANGE) 3566 ipv6_mc_remap(idev); 3567 else if (event == NETDEV_PRE_TYPE_CHANGE) 3568 ipv6_mc_unmap(idev); 3569 } 3570 3571 static bool addr_is_local(const struct in6_addr *addr) 3572 { 3573 return ipv6_addr_type(addr) & 3574 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3575 } 3576 3577 static int addrconf_ifdown(struct net_device *dev, int how) 3578 { 3579 struct net *net = dev_net(dev); 3580 struct inet6_dev *idev; 3581 struct inet6_ifaddr *ifa, *tmp; 3582 int _keep_addr; 3583 bool keep_addr; 3584 int state, i; 3585 3586 ASSERT_RTNL(); 3587 3588 rt6_ifdown(net, dev); 3589 neigh_ifdown(&nd_tbl, dev); 3590 3591 idev = __in6_dev_get(dev); 3592 if (!idev) 3593 return -ENODEV; 3594 3595 /* 3596 * Step 1: remove reference to ipv6 device from parent device. 3597 * Do not dev_put! 3598 */ 3599 if (how) { 3600 idev->dead = 1; 3601 3602 /* protected by rtnl_lock */ 3603 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3604 3605 /* Step 1.5: remove snmp6 entry */ 3606 snmp6_unregister_dev(idev); 3607 3608 } 3609 3610 /* aggregate the system setting and interface setting */ 3611 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3612 if (!_keep_addr) 3613 _keep_addr = idev->cnf.keep_addr_on_down; 3614 3615 /* combine the user config with event to determine if permanent 3616 * addresses are to be removed from address hash table 3617 */ 3618 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6); 3619 3620 /* Step 2: clear hash table */ 3621 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3622 struct hlist_head *h = &inet6_addr_lst[i]; 3623 3624 spin_lock_bh(&addrconf_hash_lock); 3625 restart: 3626 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3627 if (ifa->idev == idev) { 3628 addrconf_del_dad_work(ifa); 3629 /* combined flag + permanent flag decide if 3630 * address is retained on a down event 3631 */ 3632 if (!keep_addr || 3633 !(ifa->flags & IFA_F_PERMANENT) || 3634 addr_is_local(&ifa->addr)) { 3635 hlist_del_init_rcu(&ifa->addr_lst); 3636 goto restart; 3637 } 3638 } 3639 } 3640 spin_unlock_bh(&addrconf_hash_lock); 3641 } 3642 3643 write_lock_bh(&idev->lock); 3644 3645 addrconf_del_rs_timer(idev); 3646 3647 /* Step 2: clear flags for stateless addrconf */ 3648 if (!how) 3649 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3650 3651 /* Step 3: clear tempaddr list */ 3652 while (!list_empty(&idev->tempaddr_list)) { 3653 ifa = list_first_entry(&idev->tempaddr_list, 3654 struct inet6_ifaddr, tmp_list); 3655 list_del(&ifa->tmp_list); 3656 write_unlock_bh(&idev->lock); 3657 spin_lock_bh(&ifa->lock); 3658 3659 if (ifa->ifpub) { 3660 in6_ifa_put(ifa->ifpub); 3661 ifa->ifpub = NULL; 3662 } 3663 spin_unlock_bh(&ifa->lock); 3664 in6_ifa_put(ifa); 3665 write_lock_bh(&idev->lock); 3666 } 3667 3668 /* re-combine the user config with event to determine if permanent 3669 * addresses are to be removed from the interface list 3670 */ 3671 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6); 3672 3673 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3674 struct rt6_info *rt = NULL; 3675 bool keep; 3676 3677 addrconf_del_dad_work(ifa); 3678 3679 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3680 !addr_is_local(&ifa->addr); 3681 3682 write_unlock_bh(&idev->lock); 3683 spin_lock_bh(&ifa->lock); 3684 3685 if (keep) { 3686 /* set state to skip the notifier below */ 3687 state = INET6_IFADDR_STATE_DEAD; 3688 ifa->state = INET6_IFADDR_STATE_PREDAD; 3689 if (!(ifa->flags & IFA_F_NODAD)) 3690 ifa->flags |= IFA_F_TENTATIVE; 3691 3692 rt = ifa->rt; 3693 ifa->rt = NULL; 3694 } else { 3695 state = ifa->state; 3696 ifa->state = INET6_IFADDR_STATE_DEAD; 3697 } 3698 3699 spin_unlock_bh(&ifa->lock); 3700 3701 if (rt) 3702 ip6_del_rt(rt); 3703 3704 if (state != INET6_IFADDR_STATE_DEAD) { 3705 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3706 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3707 } else { 3708 if (idev->cnf.forwarding) 3709 addrconf_leave_anycast(ifa); 3710 addrconf_leave_solict(ifa->idev, &ifa->addr); 3711 } 3712 3713 write_lock_bh(&idev->lock); 3714 if (!keep) { 3715 list_del_rcu(&ifa->if_list); 3716 in6_ifa_put(ifa); 3717 } 3718 } 3719 3720 write_unlock_bh(&idev->lock); 3721 3722 /* Step 5: Discard anycast and multicast list */ 3723 if (how) { 3724 ipv6_ac_destroy_dev(idev); 3725 ipv6_mc_destroy_dev(idev); 3726 } else { 3727 ipv6_mc_down(idev); 3728 } 3729 3730 idev->tstamp = jiffies; 3731 3732 /* Last: Shot the device (if unregistered) */ 3733 if (how) { 3734 addrconf_sysctl_unregister(idev); 3735 neigh_parms_release(&nd_tbl, idev->nd_parms); 3736 neigh_ifdown(&nd_tbl, dev); 3737 in6_dev_put(idev); 3738 } 3739 return 0; 3740 } 3741 3742 static void addrconf_rs_timer(unsigned long data) 3743 { 3744 struct inet6_dev *idev = (struct inet6_dev *)data; 3745 struct net_device *dev = idev->dev; 3746 struct in6_addr lladdr; 3747 3748 write_lock(&idev->lock); 3749 if (idev->dead || !(idev->if_flags & IF_READY)) 3750 goto out; 3751 3752 if (!ipv6_accept_ra(idev)) 3753 goto out; 3754 3755 /* Announcement received after solicitation was sent */ 3756 if (idev->if_flags & IF_RA_RCVD) 3757 goto out; 3758 3759 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3760 write_unlock(&idev->lock); 3761 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3762 ndisc_send_rs(dev, &lladdr, 3763 &in6addr_linklocal_allrouters); 3764 else 3765 goto put; 3766 3767 write_lock(&idev->lock); 3768 idev->rs_interval = rfc3315_s14_backoff_update( 3769 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3770 /* The wait after the last probe can be shorter */ 3771 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3772 idev->cnf.rtr_solicits) ? 3773 idev->cnf.rtr_solicit_delay : 3774 idev->rs_interval); 3775 } else { 3776 /* 3777 * Note: we do not support deprecated "all on-link" 3778 * assumption any longer. 3779 */ 3780 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3781 } 3782 3783 out: 3784 write_unlock(&idev->lock); 3785 put: 3786 in6_dev_put(idev); 3787 } 3788 3789 /* 3790 * Duplicate Address Detection 3791 */ 3792 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3793 { 3794 unsigned long rand_num; 3795 struct inet6_dev *idev = ifp->idev; 3796 u64 nonce; 3797 3798 if (ifp->flags & IFA_F_OPTIMISTIC) 3799 rand_num = 0; 3800 else 3801 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3802 3803 nonce = 0; 3804 if (idev->cnf.enhanced_dad || 3805 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 3806 do 3807 get_random_bytes(&nonce, 6); 3808 while (nonce == 0); 3809 } 3810 ifp->dad_nonce = nonce; 3811 ifp->dad_probes = idev->cnf.dad_transmits; 3812 addrconf_mod_dad_work(ifp, rand_num); 3813 } 3814 3815 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3816 { 3817 struct inet6_dev *idev = ifp->idev; 3818 struct net_device *dev = idev->dev; 3819 bool bump_id, notify = false; 3820 3821 addrconf_join_solict(dev, &ifp->addr); 3822 3823 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3824 3825 read_lock_bh(&idev->lock); 3826 spin_lock(&ifp->lock); 3827 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3828 goto out; 3829 3830 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3831 (dev_net(dev)->ipv6.devconf_all->accept_dad < 1 && 3832 idev->cnf.accept_dad < 1) || 3833 !(ifp->flags&IFA_F_TENTATIVE) || 3834 ifp->flags & IFA_F_NODAD) { 3835 bump_id = ifp->flags & IFA_F_TENTATIVE; 3836 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3837 spin_unlock(&ifp->lock); 3838 read_unlock_bh(&idev->lock); 3839 3840 addrconf_dad_completed(ifp, bump_id); 3841 return; 3842 } 3843 3844 if (!(idev->if_flags & IF_READY)) { 3845 spin_unlock(&ifp->lock); 3846 read_unlock_bh(&idev->lock); 3847 /* 3848 * If the device is not ready: 3849 * - keep it tentative if it is a permanent address. 3850 * - otherwise, kill it. 3851 */ 3852 in6_ifa_hold(ifp); 3853 addrconf_dad_stop(ifp, 0); 3854 return; 3855 } 3856 3857 /* 3858 * Optimistic nodes can start receiving 3859 * Frames right away 3860 */ 3861 if (ifp->flags & IFA_F_OPTIMISTIC) { 3862 ip6_ins_rt(ifp->rt); 3863 if (ipv6_use_optimistic_addr(dev_net(dev), idev)) { 3864 /* Because optimistic nodes can use this address, 3865 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3866 */ 3867 notify = true; 3868 } 3869 } 3870 3871 addrconf_dad_kick(ifp); 3872 out: 3873 spin_unlock(&ifp->lock); 3874 read_unlock_bh(&idev->lock); 3875 if (notify) 3876 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3877 } 3878 3879 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3880 { 3881 bool begin_dad = false; 3882 3883 spin_lock_bh(&ifp->lock); 3884 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3885 ifp->state = INET6_IFADDR_STATE_PREDAD; 3886 begin_dad = true; 3887 } 3888 spin_unlock_bh(&ifp->lock); 3889 3890 if (begin_dad) 3891 addrconf_mod_dad_work(ifp, 0); 3892 } 3893 3894 static void addrconf_dad_work(struct work_struct *w) 3895 { 3896 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3897 struct inet6_ifaddr, 3898 dad_work); 3899 struct inet6_dev *idev = ifp->idev; 3900 bool bump_id, disable_ipv6 = false; 3901 struct in6_addr mcaddr; 3902 3903 enum { 3904 DAD_PROCESS, 3905 DAD_BEGIN, 3906 DAD_ABORT, 3907 } action = DAD_PROCESS; 3908 3909 rtnl_lock(); 3910 3911 spin_lock_bh(&ifp->lock); 3912 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 3913 action = DAD_BEGIN; 3914 ifp->state = INET6_IFADDR_STATE_DAD; 3915 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 3916 action = DAD_ABORT; 3917 ifp->state = INET6_IFADDR_STATE_POSTDAD; 3918 3919 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 || 3920 idev->cnf.accept_dad > 1) && 3921 !idev->cnf.disable_ipv6 && 3922 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 3923 struct in6_addr addr; 3924 3925 addr.s6_addr32[0] = htonl(0xfe800000); 3926 addr.s6_addr32[1] = 0; 3927 3928 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 3929 ipv6_addr_equal(&ifp->addr, &addr)) { 3930 /* DAD failed for link-local based on MAC */ 3931 idev->cnf.disable_ipv6 = 1; 3932 3933 pr_info("%s: IPv6 being disabled!\n", 3934 ifp->idev->dev->name); 3935 disable_ipv6 = true; 3936 } 3937 } 3938 } 3939 spin_unlock_bh(&ifp->lock); 3940 3941 if (action == DAD_BEGIN) { 3942 addrconf_dad_begin(ifp); 3943 goto out; 3944 } else if (action == DAD_ABORT) { 3945 in6_ifa_hold(ifp); 3946 addrconf_dad_stop(ifp, 1); 3947 if (disable_ipv6) 3948 addrconf_ifdown(idev->dev, 0); 3949 goto out; 3950 } 3951 3952 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3953 goto out; 3954 3955 write_lock_bh(&idev->lock); 3956 if (idev->dead || !(idev->if_flags & IF_READY)) { 3957 write_unlock_bh(&idev->lock); 3958 goto out; 3959 } 3960 3961 spin_lock(&ifp->lock); 3962 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3963 spin_unlock(&ifp->lock); 3964 write_unlock_bh(&idev->lock); 3965 goto out; 3966 } 3967 3968 if (ifp->dad_probes == 0) { 3969 /* 3970 * DAD was successful 3971 */ 3972 3973 bump_id = ifp->flags & IFA_F_TENTATIVE; 3974 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3975 spin_unlock(&ifp->lock); 3976 write_unlock_bh(&idev->lock); 3977 3978 addrconf_dad_completed(ifp, bump_id); 3979 3980 goto out; 3981 } 3982 3983 ifp->dad_probes--; 3984 addrconf_mod_dad_work(ifp, 3985 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 3986 spin_unlock(&ifp->lock); 3987 write_unlock_bh(&idev->lock); 3988 3989 /* send a neighbour solicitation for our addr */ 3990 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3991 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 3992 ifp->dad_nonce); 3993 out: 3994 in6_ifa_put(ifp); 3995 rtnl_unlock(); 3996 } 3997 3998 /* ifp->idev must be at least read locked */ 3999 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4000 { 4001 struct inet6_ifaddr *ifpiter; 4002 struct inet6_dev *idev = ifp->idev; 4003 4004 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4005 if (ifpiter->scope > IFA_LINK) 4006 break; 4007 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4008 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4009 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4010 IFA_F_PERMANENT) 4011 return false; 4012 } 4013 return true; 4014 } 4015 4016 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id) 4017 { 4018 struct net_device *dev = ifp->idev->dev; 4019 struct in6_addr lladdr; 4020 bool send_rs, send_mld; 4021 4022 addrconf_del_dad_work(ifp); 4023 4024 /* 4025 * Configure the address for reception. Now it is valid. 4026 */ 4027 4028 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4029 4030 /* If added prefix is link local and we are prepared to process 4031 router advertisements, start sending router solicitations. 4032 */ 4033 4034 read_lock_bh(&ifp->idev->lock); 4035 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4036 send_rs = send_mld && 4037 ipv6_accept_ra(ifp->idev) && 4038 ifp->idev->cnf.rtr_solicits != 0 && 4039 (dev->flags&IFF_LOOPBACK) == 0; 4040 read_unlock_bh(&ifp->idev->lock); 4041 4042 /* While dad is in progress mld report's source address is in6_addrany. 4043 * Resend with proper ll now. 4044 */ 4045 if (send_mld) 4046 ipv6_mc_dad_complete(ifp->idev); 4047 4048 if (send_rs) { 4049 /* 4050 * If a host as already performed a random delay 4051 * [...] as part of DAD [...] there is no need 4052 * to delay again before sending the first RS 4053 */ 4054 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4055 return; 4056 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4057 4058 write_lock_bh(&ifp->idev->lock); 4059 spin_lock(&ifp->lock); 4060 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4061 ifp->idev->cnf.rtr_solicit_interval); 4062 ifp->idev->rs_probes = 1; 4063 ifp->idev->if_flags |= IF_RS_SENT; 4064 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4065 spin_unlock(&ifp->lock); 4066 write_unlock_bh(&ifp->idev->lock); 4067 } 4068 4069 if (bump_id) 4070 rt_genid_bump_ipv6(dev_net(dev)); 4071 4072 /* Make sure that a new temporary address will be created 4073 * before this temporary address becomes deprecated. 4074 */ 4075 if (ifp->flags & IFA_F_TEMPORARY) 4076 addrconf_verify_rtnl(); 4077 } 4078 4079 static void addrconf_dad_run(struct inet6_dev *idev) 4080 { 4081 struct inet6_ifaddr *ifp; 4082 4083 read_lock_bh(&idev->lock); 4084 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4085 spin_lock(&ifp->lock); 4086 if (ifp->flags & IFA_F_TENTATIVE && 4087 ifp->state == INET6_IFADDR_STATE_DAD) 4088 addrconf_dad_kick(ifp); 4089 spin_unlock(&ifp->lock); 4090 } 4091 read_unlock_bh(&idev->lock); 4092 } 4093 4094 #ifdef CONFIG_PROC_FS 4095 struct if6_iter_state { 4096 struct seq_net_private p; 4097 int bucket; 4098 int offset; 4099 }; 4100 4101 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4102 { 4103 struct if6_iter_state *state = seq->private; 4104 struct net *net = seq_file_net(seq); 4105 struct inet6_ifaddr *ifa = NULL; 4106 int p = 0; 4107 4108 /* initial bucket if pos is 0 */ 4109 if (pos == 0) { 4110 state->bucket = 0; 4111 state->offset = 0; 4112 } 4113 4114 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4115 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket], 4116 addr_lst) { 4117 if (!net_eq(dev_net(ifa->idev->dev), net)) 4118 continue; 4119 /* sync with offset */ 4120 if (p < state->offset) { 4121 p++; 4122 continue; 4123 } 4124 state->offset++; 4125 return ifa; 4126 } 4127 4128 /* prepare for next bucket */ 4129 state->offset = 0; 4130 p = 0; 4131 } 4132 return NULL; 4133 } 4134 4135 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4136 struct inet6_ifaddr *ifa) 4137 { 4138 struct if6_iter_state *state = seq->private; 4139 struct net *net = seq_file_net(seq); 4140 4141 hlist_for_each_entry_continue_rcu(ifa, addr_lst) { 4142 if (!net_eq(dev_net(ifa->idev->dev), net)) 4143 continue; 4144 state->offset++; 4145 return ifa; 4146 } 4147 4148 while (++state->bucket < IN6_ADDR_HSIZE) { 4149 state->offset = 0; 4150 hlist_for_each_entry_rcu(ifa, 4151 &inet6_addr_lst[state->bucket], addr_lst) { 4152 if (!net_eq(dev_net(ifa->idev->dev), net)) 4153 continue; 4154 state->offset++; 4155 return ifa; 4156 } 4157 } 4158 4159 return NULL; 4160 } 4161 4162 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4163 __acquires(rcu) 4164 { 4165 rcu_read_lock(); 4166 return if6_get_first(seq, *pos); 4167 } 4168 4169 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4170 { 4171 struct inet6_ifaddr *ifa; 4172 4173 ifa = if6_get_next(seq, v); 4174 ++*pos; 4175 return ifa; 4176 } 4177 4178 static void if6_seq_stop(struct seq_file *seq, void *v) 4179 __releases(rcu) 4180 { 4181 rcu_read_unlock(); 4182 } 4183 4184 static int if6_seq_show(struct seq_file *seq, void *v) 4185 { 4186 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4187 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4188 &ifp->addr, 4189 ifp->idev->dev->ifindex, 4190 ifp->prefix_len, 4191 ifp->scope, 4192 (u8) ifp->flags, 4193 ifp->idev->dev->name); 4194 return 0; 4195 } 4196 4197 static const struct seq_operations if6_seq_ops = { 4198 .start = if6_seq_start, 4199 .next = if6_seq_next, 4200 .show = if6_seq_show, 4201 .stop = if6_seq_stop, 4202 }; 4203 4204 static int if6_seq_open(struct inode *inode, struct file *file) 4205 { 4206 return seq_open_net(inode, file, &if6_seq_ops, 4207 sizeof(struct if6_iter_state)); 4208 } 4209 4210 static const struct file_operations if6_fops = { 4211 .owner = THIS_MODULE, 4212 .open = if6_seq_open, 4213 .read = seq_read, 4214 .llseek = seq_lseek, 4215 .release = seq_release_net, 4216 }; 4217 4218 static int __net_init if6_proc_net_init(struct net *net) 4219 { 4220 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 4221 return -ENOMEM; 4222 return 0; 4223 } 4224 4225 static void __net_exit if6_proc_net_exit(struct net *net) 4226 { 4227 remove_proc_entry("if_inet6", net->proc_net); 4228 } 4229 4230 static struct pernet_operations if6_proc_net_ops = { 4231 .init = if6_proc_net_init, 4232 .exit = if6_proc_net_exit, 4233 }; 4234 4235 int __init if6_proc_init(void) 4236 { 4237 return register_pernet_subsys(&if6_proc_net_ops); 4238 } 4239 4240 void if6_proc_exit(void) 4241 { 4242 unregister_pernet_subsys(&if6_proc_net_ops); 4243 } 4244 #endif /* CONFIG_PROC_FS */ 4245 4246 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4247 /* Check if address is a home address configured on any interface. */ 4248 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4249 { 4250 unsigned int hash = inet6_addr_hash(net, addr); 4251 struct inet6_ifaddr *ifp = NULL; 4252 int ret = 0; 4253 4254 rcu_read_lock(); 4255 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 4256 if (!net_eq(dev_net(ifp->idev->dev), net)) 4257 continue; 4258 if (ipv6_addr_equal(&ifp->addr, addr) && 4259 (ifp->flags & IFA_F_HOMEADDRESS)) { 4260 ret = 1; 4261 break; 4262 } 4263 } 4264 rcu_read_unlock(); 4265 return ret; 4266 } 4267 #endif 4268 4269 /* 4270 * Periodic address status verification 4271 */ 4272 4273 static void addrconf_verify_rtnl(void) 4274 { 4275 unsigned long now, next, next_sec, next_sched; 4276 struct inet6_ifaddr *ifp; 4277 int i; 4278 4279 ASSERT_RTNL(); 4280 4281 rcu_read_lock_bh(); 4282 now = jiffies; 4283 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4284 4285 cancel_delayed_work(&addr_chk_work); 4286 4287 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4288 restart: 4289 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4290 unsigned long age; 4291 4292 /* When setting preferred_lft to a value not zero or 4293 * infinity, while valid_lft is infinity 4294 * IFA_F_PERMANENT has a non-infinity life time. 4295 */ 4296 if ((ifp->flags & IFA_F_PERMANENT) && 4297 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4298 continue; 4299 4300 spin_lock(&ifp->lock); 4301 /* We try to batch several events at once. */ 4302 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4303 4304 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4305 age >= ifp->valid_lft) { 4306 spin_unlock(&ifp->lock); 4307 in6_ifa_hold(ifp); 4308 ipv6_del_addr(ifp); 4309 goto restart; 4310 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4311 spin_unlock(&ifp->lock); 4312 continue; 4313 } else if (age >= ifp->prefered_lft) { 4314 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4315 int deprecate = 0; 4316 4317 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4318 deprecate = 1; 4319 ifp->flags |= IFA_F_DEPRECATED; 4320 } 4321 4322 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4323 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4324 next = ifp->tstamp + ifp->valid_lft * HZ; 4325 4326 spin_unlock(&ifp->lock); 4327 4328 if (deprecate) { 4329 in6_ifa_hold(ifp); 4330 4331 ipv6_ifa_notify(0, ifp); 4332 in6_ifa_put(ifp); 4333 goto restart; 4334 } 4335 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4336 !(ifp->flags&IFA_F_TENTATIVE)) { 4337 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4338 ifp->idev->cnf.dad_transmits * 4339 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 4340 4341 if (age >= ifp->prefered_lft - regen_advance) { 4342 struct inet6_ifaddr *ifpub = ifp->ifpub; 4343 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4344 next = ifp->tstamp + ifp->prefered_lft * HZ; 4345 if (!ifp->regen_count && ifpub) { 4346 ifp->regen_count++; 4347 in6_ifa_hold(ifp); 4348 in6_ifa_hold(ifpub); 4349 spin_unlock(&ifp->lock); 4350 4351 spin_lock(&ifpub->lock); 4352 ifpub->regen_count = 0; 4353 spin_unlock(&ifpub->lock); 4354 ipv6_create_tempaddr(ifpub, ifp); 4355 in6_ifa_put(ifpub); 4356 in6_ifa_put(ifp); 4357 goto restart; 4358 } 4359 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4360 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4361 spin_unlock(&ifp->lock); 4362 } else { 4363 /* ifp->prefered_lft <= ifp->valid_lft */ 4364 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4365 next = ifp->tstamp + ifp->prefered_lft * HZ; 4366 spin_unlock(&ifp->lock); 4367 } 4368 } 4369 } 4370 4371 next_sec = round_jiffies_up(next); 4372 next_sched = next; 4373 4374 /* If rounded timeout is accurate enough, accept it. */ 4375 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4376 next_sched = next_sec; 4377 4378 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4379 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4380 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4381 4382 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4383 now, next, next_sec, next_sched); 4384 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4385 rcu_read_unlock_bh(); 4386 } 4387 4388 static void addrconf_verify_work(struct work_struct *w) 4389 { 4390 rtnl_lock(); 4391 addrconf_verify_rtnl(); 4392 rtnl_unlock(); 4393 } 4394 4395 static void addrconf_verify(void) 4396 { 4397 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4398 } 4399 4400 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4401 struct in6_addr **peer_pfx) 4402 { 4403 struct in6_addr *pfx = NULL; 4404 4405 *peer_pfx = NULL; 4406 4407 if (addr) 4408 pfx = nla_data(addr); 4409 4410 if (local) { 4411 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4412 *peer_pfx = pfx; 4413 pfx = nla_data(local); 4414 } 4415 4416 return pfx; 4417 } 4418 4419 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4420 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4421 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4422 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4423 [IFA_FLAGS] = { .len = sizeof(u32) }, 4424 }; 4425 4426 static int 4427 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4428 struct netlink_ext_ack *extack) 4429 { 4430 struct net *net = sock_net(skb->sk); 4431 struct ifaddrmsg *ifm; 4432 struct nlattr *tb[IFA_MAX+1]; 4433 struct in6_addr *pfx, *peer_pfx; 4434 u32 ifa_flags; 4435 int err; 4436 4437 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4438 extack); 4439 if (err < 0) 4440 return err; 4441 4442 ifm = nlmsg_data(nlh); 4443 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4444 if (!pfx) 4445 return -EINVAL; 4446 4447 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4448 4449 /* We ignore other flags so far. */ 4450 ifa_flags &= IFA_F_MANAGETEMPADDR; 4451 4452 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4453 ifm->ifa_prefixlen); 4454 } 4455 4456 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags, 4457 u32 prefered_lft, u32 valid_lft) 4458 { 4459 u32 flags; 4460 clock_t expires; 4461 unsigned long timeout; 4462 bool was_managetempaddr; 4463 bool had_prefixroute; 4464 4465 ASSERT_RTNL(); 4466 4467 if (!valid_lft || (prefered_lft > valid_lft)) 4468 return -EINVAL; 4469 4470 if (ifa_flags & IFA_F_MANAGETEMPADDR && 4471 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4472 return -EINVAL; 4473 4474 timeout = addrconf_timeout_fixup(valid_lft, HZ); 4475 if (addrconf_finite_timeout(timeout)) { 4476 expires = jiffies_to_clock_t(timeout * HZ); 4477 valid_lft = timeout; 4478 flags = RTF_EXPIRES; 4479 } else { 4480 expires = 0; 4481 flags = 0; 4482 ifa_flags |= IFA_F_PERMANENT; 4483 } 4484 4485 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 4486 if (addrconf_finite_timeout(timeout)) { 4487 if (timeout == 0) 4488 ifa_flags |= IFA_F_DEPRECATED; 4489 prefered_lft = timeout; 4490 } 4491 4492 spin_lock_bh(&ifp->lock); 4493 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4494 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4495 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4496 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4497 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4498 IFA_F_NOPREFIXROUTE); 4499 ifp->flags |= ifa_flags; 4500 ifp->tstamp = jiffies; 4501 ifp->valid_lft = valid_lft; 4502 ifp->prefered_lft = prefered_lft; 4503 4504 spin_unlock_bh(&ifp->lock); 4505 if (!(ifp->flags&IFA_F_TENTATIVE)) 4506 ipv6_ifa_notify(0, ifp); 4507 4508 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 4509 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 4510 expires, flags); 4511 } else if (had_prefixroute) { 4512 enum cleanup_prefix_rt_t action; 4513 unsigned long rt_expires; 4514 4515 write_lock_bh(&ifp->idev->lock); 4516 action = check_cleanup_prefix_route(ifp, &rt_expires); 4517 write_unlock_bh(&ifp->idev->lock); 4518 4519 if (action != CLEANUP_PREFIX_RT_NOP) { 4520 cleanup_prefix_route(ifp, rt_expires, 4521 action == CLEANUP_PREFIX_RT_DEL); 4522 } 4523 } 4524 4525 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4526 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR)) 4527 valid_lft = prefered_lft = 0; 4528 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft, 4529 !was_managetempaddr, jiffies); 4530 } 4531 4532 addrconf_verify_rtnl(); 4533 4534 return 0; 4535 } 4536 4537 static int 4538 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4539 struct netlink_ext_ack *extack) 4540 { 4541 struct net *net = sock_net(skb->sk); 4542 struct ifaddrmsg *ifm; 4543 struct nlattr *tb[IFA_MAX+1]; 4544 struct in6_addr *pfx, *peer_pfx; 4545 struct inet6_ifaddr *ifa; 4546 struct net_device *dev; 4547 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 4548 u32 ifa_flags; 4549 int err; 4550 4551 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4552 extack); 4553 if (err < 0) 4554 return err; 4555 4556 ifm = nlmsg_data(nlh); 4557 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4558 if (!pfx) 4559 return -EINVAL; 4560 4561 if (tb[IFA_CACHEINFO]) { 4562 struct ifa_cacheinfo *ci; 4563 4564 ci = nla_data(tb[IFA_CACHEINFO]); 4565 valid_lft = ci->ifa_valid; 4566 preferred_lft = ci->ifa_prefered; 4567 } else { 4568 preferred_lft = INFINITY_LIFE_TIME; 4569 valid_lft = INFINITY_LIFE_TIME; 4570 } 4571 4572 dev = __dev_get_by_index(net, ifm->ifa_index); 4573 if (!dev) 4574 return -ENODEV; 4575 4576 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4577 4578 /* We ignore other flags so far. */ 4579 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4580 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN; 4581 4582 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 4583 if (!ifa) { 4584 /* 4585 * It would be best to check for !NLM_F_CREATE here but 4586 * userspace already relies on not having to provide this. 4587 */ 4588 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 4589 ifm->ifa_prefixlen, ifa_flags, 4590 preferred_lft, valid_lft, extack); 4591 } 4592 4593 if (nlh->nlmsg_flags & NLM_F_EXCL || 4594 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4595 err = -EEXIST; 4596 else 4597 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 4598 4599 in6_ifa_put(ifa); 4600 4601 return err; 4602 } 4603 4604 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4605 u8 scope, int ifindex) 4606 { 4607 struct ifaddrmsg *ifm; 4608 4609 ifm = nlmsg_data(nlh); 4610 ifm->ifa_family = AF_INET6; 4611 ifm->ifa_prefixlen = prefixlen; 4612 ifm->ifa_flags = flags; 4613 ifm->ifa_scope = scope; 4614 ifm->ifa_index = ifindex; 4615 } 4616 4617 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4618 unsigned long tstamp, u32 preferred, u32 valid) 4619 { 4620 struct ifa_cacheinfo ci; 4621 4622 ci.cstamp = cstamp_delta(cstamp); 4623 ci.tstamp = cstamp_delta(tstamp); 4624 ci.ifa_prefered = preferred; 4625 ci.ifa_valid = valid; 4626 4627 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4628 } 4629 4630 static inline int rt_scope(int ifa_scope) 4631 { 4632 if (ifa_scope & IFA_HOST) 4633 return RT_SCOPE_HOST; 4634 else if (ifa_scope & IFA_LINK) 4635 return RT_SCOPE_LINK; 4636 else if (ifa_scope & IFA_SITE) 4637 return RT_SCOPE_SITE; 4638 else 4639 return RT_SCOPE_UNIVERSE; 4640 } 4641 4642 static inline int inet6_ifaddr_msgsize(void) 4643 { 4644 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4645 + nla_total_size(16) /* IFA_LOCAL */ 4646 + nla_total_size(16) /* IFA_ADDRESS */ 4647 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4648 + nla_total_size(4) /* IFA_FLAGS */; 4649 } 4650 4651 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4652 u32 portid, u32 seq, int event, unsigned int flags) 4653 { 4654 struct nlmsghdr *nlh; 4655 u32 preferred, valid; 4656 4657 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4658 if (!nlh) 4659 return -EMSGSIZE; 4660 4661 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4662 ifa->idev->dev->ifindex); 4663 4664 if (!((ifa->flags&IFA_F_PERMANENT) && 4665 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4666 preferred = ifa->prefered_lft; 4667 valid = ifa->valid_lft; 4668 if (preferred != INFINITY_LIFE_TIME) { 4669 long tval = (jiffies - ifa->tstamp)/HZ; 4670 if (preferred > tval) 4671 preferred -= tval; 4672 else 4673 preferred = 0; 4674 if (valid != INFINITY_LIFE_TIME) { 4675 if (valid > tval) 4676 valid -= tval; 4677 else 4678 valid = 0; 4679 } 4680 } 4681 } else { 4682 preferred = INFINITY_LIFE_TIME; 4683 valid = INFINITY_LIFE_TIME; 4684 } 4685 4686 if (!ipv6_addr_any(&ifa->peer_addr)) { 4687 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4688 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4689 goto error; 4690 } else 4691 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4692 goto error; 4693 4694 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4695 goto error; 4696 4697 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4698 goto error; 4699 4700 nlmsg_end(skb, nlh); 4701 return 0; 4702 4703 error: 4704 nlmsg_cancel(skb, nlh); 4705 return -EMSGSIZE; 4706 } 4707 4708 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4709 u32 portid, u32 seq, int event, u16 flags) 4710 { 4711 struct nlmsghdr *nlh; 4712 u8 scope = RT_SCOPE_UNIVERSE; 4713 int ifindex = ifmca->idev->dev->ifindex; 4714 4715 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4716 scope = RT_SCOPE_SITE; 4717 4718 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4719 if (!nlh) 4720 return -EMSGSIZE; 4721 4722 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4723 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 4724 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4725 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4726 nlmsg_cancel(skb, nlh); 4727 return -EMSGSIZE; 4728 } 4729 4730 nlmsg_end(skb, nlh); 4731 return 0; 4732 } 4733 4734 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4735 u32 portid, u32 seq, int event, unsigned int flags) 4736 { 4737 struct nlmsghdr *nlh; 4738 u8 scope = RT_SCOPE_UNIVERSE; 4739 int ifindex = ifaca->aca_idev->dev->ifindex; 4740 4741 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4742 scope = RT_SCOPE_SITE; 4743 4744 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4745 if (!nlh) 4746 return -EMSGSIZE; 4747 4748 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4749 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 4750 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4751 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4752 nlmsg_cancel(skb, nlh); 4753 return -EMSGSIZE; 4754 } 4755 4756 nlmsg_end(skb, nlh); 4757 return 0; 4758 } 4759 4760 enum addr_type_t { 4761 UNICAST_ADDR, 4762 MULTICAST_ADDR, 4763 ANYCAST_ADDR, 4764 }; 4765 4766 /* called with rcu_read_lock() */ 4767 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 4768 struct netlink_callback *cb, enum addr_type_t type, 4769 int s_ip_idx, int *p_ip_idx) 4770 { 4771 struct ifmcaddr6 *ifmca; 4772 struct ifacaddr6 *ifaca; 4773 int err = 1; 4774 int ip_idx = *p_ip_idx; 4775 4776 read_lock_bh(&idev->lock); 4777 switch (type) { 4778 case UNICAST_ADDR: { 4779 struct inet6_ifaddr *ifa; 4780 4781 /* unicast address incl. temp addr */ 4782 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4783 if (++ip_idx < s_ip_idx) 4784 continue; 4785 err = inet6_fill_ifaddr(skb, ifa, 4786 NETLINK_CB(cb->skb).portid, 4787 cb->nlh->nlmsg_seq, 4788 RTM_NEWADDR, 4789 NLM_F_MULTI); 4790 if (err < 0) 4791 break; 4792 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4793 } 4794 break; 4795 } 4796 case MULTICAST_ADDR: 4797 /* multicast address */ 4798 for (ifmca = idev->mc_list; ifmca; 4799 ifmca = ifmca->next, ip_idx++) { 4800 if (ip_idx < s_ip_idx) 4801 continue; 4802 err = inet6_fill_ifmcaddr(skb, ifmca, 4803 NETLINK_CB(cb->skb).portid, 4804 cb->nlh->nlmsg_seq, 4805 RTM_GETMULTICAST, 4806 NLM_F_MULTI); 4807 if (err < 0) 4808 break; 4809 } 4810 break; 4811 case ANYCAST_ADDR: 4812 /* anycast address */ 4813 for (ifaca = idev->ac_list; ifaca; 4814 ifaca = ifaca->aca_next, ip_idx++) { 4815 if (ip_idx < s_ip_idx) 4816 continue; 4817 err = inet6_fill_ifacaddr(skb, ifaca, 4818 NETLINK_CB(cb->skb).portid, 4819 cb->nlh->nlmsg_seq, 4820 RTM_GETANYCAST, 4821 NLM_F_MULTI); 4822 if (err < 0) 4823 break; 4824 } 4825 break; 4826 default: 4827 break; 4828 } 4829 read_unlock_bh(&idev->lock); 4830 *p_ip_idx = ip_idx; 4831 return err; 4832 } 4833 4834 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4835 enum addr_type_t type) 4836 { 4837 struct net *net = sock_net(skb->sk); 4838 int h, s_h; 4839 int idx, ip_idx; 4840 int s_idx, s_ip_idx; 4841 struct net_device *dev; 4842 struct inet6_dev *idev; 4843 struct hlist_head *head; 4844 4845 s_h = cb->args[0]; 4846 s_idx = idx = cb->args[1]; 4847 s_ip_idx = ip_idx = cb->args[2]; 4848 4849 rcu_read_lock(); 4850 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4851 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4852 idx = 0; 4853 head = &net->dev_index_head[h]; 4854 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4855 if (idx < s_idx) 4856 goto cont; 4857 if (h > s_h || idx > s_idx) 4858 s_ip_idx = 0; 4859 ip_idx = 0; 4860 idev = __in6_dev_get(dev); 4861 if (!idev) 4862 goto cont; 4863 4864 if (in6_dump_addrs(idev, skb, cb, type, 4865 s_ip_idx, &ip_idx) < 0) 4866 goto done; 4867 cont: 4868 idx++; 4869 } 4870 } 4871 done: 4872 rcu_read_unlock(); 4873 cb->args[0] = h; 4874 cb->args[1] = idx; 4875 cb->args[2] = ip_idx; 4876 4877 return skb->len; 4878 } 4879 4880 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4881 { 4882 enum addr_type_t type = UNICAST_ADDR; 4883 4884 return inet6_dump_addr(skb, cb, type); 4885 } 4886 4887 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4888 { 4889 enum addr_type_t type = MULTICAST_ADDR; 4890 4891 return inet6_dump_addr(skb, cb, type); 4892 } 4893 4894 4895 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4896 { 4897 enum addr_type_t type = ANYCAST_ADDR; 4898 4899 return inet6_dump_addr(skb, cb, type); 4900 } 4901 4902 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 4903 struct netlink_ext_ack *extack) 4904 { 4905 struct net *net = sock_net(in_skb->sk); 4906 struct ifaddrmsg *ifm; 4907 struct nlattr *tb[IFA_MAX+1]; 4908 struct in6_addr *addr = NULL, *peer; 4909 struct net_device *dev = NULL; 4910 struct inet6_ifaddr *ifa; 4911 struct sk_buff *skb; 4912 int err; 4913 4914 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4915 extack); 4916 if (err < 0) 4917 return err; 4918 4919 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4920 if (!addr) 4921 return -EINVAL; 4922 4923 ifm = nlmsg_data(nlh); 4924 if (ifm->ifa_index) 4925 dev = dev_get_by_index(net, ifm->ifa_index); 4926 4927 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4928 if (!ifa) { 4929 err = -EADDRNOTAVAIL; 4930 goto errout; 4931 } 4932 4933 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4934 if (!skb) { 4935 err = -ENOBUFS; 4936 goto errout_ifa; 4937 } 4938 4939 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4940 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4941 if (err < 0) { 4942 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4943 WARN_ON(err == -EMSGSIZE); 4944 kfree_skb(skb); 4945 goto errout_ifa; 4946 } 4947 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4948 errout_ifa: 4949 in6_ifa_put(ifa); 4950 errout: 4951 if (dev) 4952 dev_put(dev); 4953 return err; 4954 } 4955 4956 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4957 { 4958 struct sk_buff *skb; 4959 struct net *net = dev_net(ifa->idev->dev); 4960 int err = -ENOBUFS; 4961 4962 /* Don't send DELADDR notification for TENTATIVE address, 4963 * since NEWADDR notification is sent only after removing 4964 * TENTATIVE flag, if DAD has not failed. 4965 */ 4966 if (ifa->flags & IFA_F_TENTATIVE && !(ifa->flags & IFA_F_DADFAILED) && 4967 event == RTM_DELADDR) 4968 return; 4969 4970 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4971 if (!skb) 4972 goto errout; 4973 4974 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4975 if (err < 0) { 4976 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4977 WARN_ON(err == -EMSGSIZE); 4978 kfree_skb(skb); 4979 goto errout; 4980 } 4981 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4982 return; 4983 errout: 4984 if (err < 0) 4985 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4986 } 4987 4988 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4989 __s32 *array, int bytes) 4990 { 4991 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4992 4993 memset(array, 0, bytes); 4994 array[DEVCONF_FORWARDING] = cnf->forwarding; 4995 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4996 array[DEVCONF_MTU6] = cnf->mtu6; 4997 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 4998 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 4999 array[DEVCONF_AUTOCONF] = cnf->autoconf; 5000 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 5001 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 5002 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5003 jiffies_to_msecs(cnf->rtr_solicit_interval); 5004 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5005 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 5006 array[DEVCONF_RTR_SOLICIT_DELAY] = 5007 jiffies_to_msecs(cnf->rtr_solicit_delay); 5008 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 5009 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5010 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 5011 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5012 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 5013 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 5014 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 5015 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 5016 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 5017 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 5018 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 5019 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 5020 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 5021 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 5022 #ifdef CONFIG_IPV6_ROUTER_PREF 5023 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 5024 array[DEVCONF_RTR_PROBE_INTERVAL] = 5025 jiffies_to_msecs(cnf->rtr_probe_interval); 5026 #ifdef CONFIG_IPV6_ROUTE_INFO 5027 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen; 5028 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 5029 #endif 5030 #endif 5031 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 5032 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 5033 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5034 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 5035 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 5036 #endif 5037 #ifdef CONFIG_IPV6_MROUTE 5038 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 5039 #endif 5040 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 5041 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 5042 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 5043 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 5044 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 5045 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 5046 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 5047 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 5048 /* we omit DEVCONF_STABLE_SECRET for now */ 5049 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 5050 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 5051 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 5052 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5053 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5054 #ifdef CONFIG_IPV6_SEG6_HMAC 5055 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5056 #endif 5057 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5058 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5059 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy; 5060 } 5061 5062 static inline size_t inet6_ifla6_size(void) 5063 { 5064 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5065 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5066 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5067 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5068 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5069 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 5070 } 5071 5072 static inline size_t inet6_if_nlmsg_size(void) 5073 { 5074 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5075 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5076 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5077 + nla_total_size(4) /* IFLA_MTU */ 5078 + nla_total_size(4) /* IFLA_LINK */ 5079 + nla_total_size(1) /* IFLA_OPERSTATE */ 5080 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5081 } 5082 5083 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5084 int bytes) 5085 { 5086 int i; 5087 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5088 BUG_ON(pad < 0); 5089 5090 /* Use put_unaligned() because stats may not be aligned for u64. */ 5091 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5092 for (i = 1; i < ICMP6_MIB_MAX; i++) 5093 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5094 5095 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5096 } 5097 5098 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5099 int bytes, size_t syncpoff) 5100 { 5101 int i, c; 5102 u64 buff[IPSTATS_MIB_MAX]; 5103 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5104 5105 BUG_ON(pad < 0); 5106 5107 memset(buff, 0, sizeof(buff)); 5108 buff[0] = IPSTATS_MIB_MAX; 5109 5110 for_each_possible_cpu(c) { 5111 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5112 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5113 } 5114 5115 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5116 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5117 } 5118 5119 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5120 int bytes) 5121 { 5122 switch (attrtype) { 5123 case IFLA_INET6_STATS: 5124 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5125 offsetof(struct ipstats_mib, syncp)); 5126 break; 5127 case IFLA_INET6_ICMP6STATS: 5128 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5129 break; 5130 } 5131 } 5132 5133 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5134 u32 ext_filter_mask) 5135 { 5136 struct nlattr *nla; 5137 struct ifla_cacheinfo ci; 5138 5139 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5140 goto nla_put_failure; 5141 ci.max_reasm_len = IPV6_MAXPLEN; 5142 ci.tstamp = cstamp_delta(idev->tstamp); 5143 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5144 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5145 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5146 goto nla_put_failure; 5147 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5148 if (!nla) 5149 goto nla_put_failure; 5150 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5151 5152 /* XXX - MC not implemented */ 5153 5154 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5155 return 0; 5156 5157 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5158 if (!nla) 5159 goto nla_put_failure; 5160 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5161 5162 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5163 if (!nla) 5164 goto nla_put_failure; 5165 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5166 5167 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5168 if (!nla) 5169 goto nla_put_failure; 5170 5171 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5172 goto nla_put_failure; 5173 5174 read_lock_bh(&idev->lock); 5175 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5176 read_unlock_bh(&idev->lock); 5177 5178 return 0; 5179 5180 nla_put_failure: 5181 return -EMSGSIZE; 5182 } 5183 5184 static size_t inet6_get_link_af_size(const struct net_device *dev, 5185 u32 ext_filter_mask) 5186 { 5187 if (!__in6_dev_get(dev)) 5188 return 0; 5189 5190 return inet6_ifla6_size(); 5191 } 5192 5193 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5194 u32 ext_filter_mask) 5195 { 5196 struct inet6_dev *idev = __in6_dev_get(dev); 5197 5198 if (!idev) 5199 return -ENODATA; 5200 5201 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5202 return -EMSGSIZE; 5203 5204 return 0; 5205 } 5206 5207 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 5208 { 5209 struct inet6_ifaddr *ifp; 5210 struct net_device *dev = idev->dev; 5211 bool clear_token, update_rs = false; 5212 struct in6_addr ll_addr; 5213 5214 ASSERT_RTNL(); 5215 5216 if (!token) 5217 return -EINVAL; 5218 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 5219 return -EINVAL; 5220 if (!ipv6_accept_ra(idev)) 5221 return -EINVAL; 5222 if (idev->cnf.rtr_solicits == 0) 5223 return -EINVAL; 5224 5225 write_lock_bh(&idev->lock); 5226 5227 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5228 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5229 5230 write_unlock_bh(&idev->lock); 5231 5232 clear_token = ipv6_addr_any(token); 5233 if (clear_token) 5234 goto update_lft; 5235 5236 if (!idev->dead && (idev->if_flags & IF_READY) && 5237 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5238 IFA_F_OPTIMISTIC)) { 5239 /* If we're not ready, then normal ifup will take care 5240 * of this. Otherwise, we need to request our rs here. 5241 */ 5242 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5243 update_rs = true; 5244 } 5245 5246 update_lft: 5247 write_lock_bh(&idev->lock); 5248 5249 if (update_rs) { 5250 idev->if_flags |= IF_RS_SENT; 5251 idev->rs_interval = rfc3315_s14_backoff_init( 5252 idev->cnf.rtr_solicit_interval); 5253 idev->rs_probes = 1; 5254 addrconf_mod_rs_timer(idev, idev->rs_interval); 5255 } 5256 5257 /* Well, that's kinda nasty ... */ 5258 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5259 spin_lock(&ifp->lock); 5260 if (ifp->tokenized) { 5261 ifp->valid_lft = 0; 5262 ifp->prefered_lft = 0; 5263 } 5264 spin_unlock(&ifp->lock); 5265 } 5266 5267 write_unlock_bh(&idev->lock); 5268 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5269 addrconf_verify_rtnl(); 5270 return 0; 5271 } 5272 5273 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5274 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5275 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5276 }; 5277 5278 static int inet6_validate_link_af(const struct net_device *dev, 5279 const struct nlattr *nla) 5280 { 5281 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5282 5283 if (dev && !__in6_dev_get(dev)) 5284 return -EAFNOSUPPORT; 5285 5286 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy, 5287 NULL); 5288 } 5289 5290 static int check_addr_gen_mode(int mode) 5291 { 5292 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5293 mode != IN6_ADDR_GEN_MODE_NONE && 5294 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5295 mode != IN6_ADDR_GEN_MODE_RANDOM) 5296 return -EINVAL; 5297 return 1; 5298 } 5299 5300 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5301 int mode) 5302 { 5303 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5304 !idev->cnf.stable_secret.initialized && 5305 !net->ipv6.devconf_dflt->stable_secret.initialized) 5306 return -EINVAL; 5307 return 1; 5308 } 5309 5310 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 5311 { 5312 int err = -EINVAL; 5313 struct inet6_dev *idev = __in6_dev_get(dev); 5314 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5315 5316 if (!idev) 5317 return -EAFNOSUPPORT; 5318 5319 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 5320 BUG(); 5321 5322 if (tb[IFLA_INET6_TOKEN]) { 5323 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 5324 if (err) 5325 return err; 5326 } 5327 5328 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5329 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5330 5331 if (check_addr_gen_mode(mode) < 0 || 5332 check_stable_privacy(idev, dev_net(dev), mode) < 0) 5333 return -EINVAL; 5334 5335 idev->cnf.addr_gen_mode = mode; 5336 err = 0; 5337 } 5338 5339 return err; 5340 } 5341 5342 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5343 u32 portid, u32 seq, int event, unsigned int flags) 5344 { 5345 struct net_device *dev = idev->dev; 5346 struct ifinfomsg *hdr; 5347 struct nlmsghdr *nlh; 5348 void *protoinfo; 5349 5350 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5351 if (!nlh) 5352 return -EMSGSIZE; 5353 5354 hdr = nlmsg_data(nlh); 5355 hdr->ifi_family = AF_INET6; 5356 hdr->__ifi_pad = 0; 5357 hdr->ifi_type = dev->type; 5358 hdr->ifi_index = dev->ifindex; 5359 hdr->ifi_flags = dev_get_flags(dev); 5360 hdr->ifi_change = 0; 5361 5362 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5363 (dev->addr_len && 5364 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5365 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5366 (dev->ifindex != dev_get_iflink(dev) && 5367 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5368 nla_put_u8(skb, IFLA_OPERSTATE, 5369 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5370 goto nla_put_failure; 5371 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 5372 if (!protoinfo) 5373 goto nla_put_failure; 5374 5375 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5376 goto nla_put_failure; 5377 5378 nla_nest_end(skb, protoinfo); 5379 nlmsg_end(skb, nlh); 5380 return 0; 5381 5382 nla_put_failure: 5383 nlmsg_cancel(skb, nlh); 5384 return -EMSGSIZE; 5385 } 5386 5387 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5388 { 5389 struct net *net = sock_net(skb->sk); 5390 int h, s_h; 5391 int idx = 0, s_idx; 5392 struct net_device *dev; 5393 struct inet6_dev *idev; 5394 struct hlist_head *head; 5395 5396 s_h = cb->args[0]; 5397 s_idx = cb->args[1]; 5398 5399 rcu_read_lock(); 5400 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5401 idx = 0; 5402 head = &net->dev_index_head[h]; 5403 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5404 if (idx < s_idx) 5405 goto cont; 5406 idev = __in6_dev_get(dev); 5407 if (!idev) 5408 goto cont; 5409 if (inet6_fill_ifinfo(skb, idev, 5410 NETLINK_CB(cb->skb).portid, 5411 cb->nlh->nlmsg_seq, 5412 RTM_NEWLINK, NLM_F_MULTI) < 0) 5413 goto out; 5414 cont: 5415 idx++; 5416 } 5417 } 5418 out: 5419 rcu_read_unlock(); 5420 cb->args[1] = idx; 5421 cb->args[0] = h; 5422 5423 return skb->len; 5424 } 5425 5426 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5427 { 5428 struct sk_buff *skb; 5429 struct net *net = dev_net(idev->dev); 5430 int err = -ENOBUFS; 5431 5432 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5433 if (!skb) 5434 goto errout; 5435 5436 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5437 if (err < 0) { 5438 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5439 WARN_ON(err == -EMSGSIZE); 5440 kfree_skb(skb); 5441 goto errout; 5442 } 5443 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5444 return; 5445 errout: 5446 if (err < 0) 5447 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5448 } 5449 5450 static inline size_t inet6_prefix_nlmsg_size(void) 5451 { 5452 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5453 + nla_total_size(sizeof(struct in6_addr)) 5454 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5455 } 5456 5457 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5458 struct prefix_info *pinfo, u32 portid, u32 seq, 5459 int event, unsigned int flags) 5460 { 5461 struct prefixmsg *pmsg; 5462 struct nlmsghdr *nlh; 5463 struct prefix_cacheinfo ci; 5464 5465 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5466 if (!nlh) 5467 return -EMSGSIZE; 5468 5469 pmsg = nlmsg_data(nlh); 5470 pmsg->prefix_family = AF_INET6; 5471 pmsg->prefix_pad1 = 0; 5472 pmsg->prefix_pad2 = 0; 5473 pmsg->prefix_ifindex = idev->dev->ifindex; 5474 pmsg->prefix_len = pinfo->prefix_len; 5475 pmsg->prefix_type = pinfo->type; 5476 pmsg->prefix_pad3 = 0; 5477 pmsg->prefix_flags = 0; 5478 if (pinfo->onlink) 5479 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 5480 if (pinfo->autoconf) 5481 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 5482 5483 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5484 goto nla_put_failure; 5485 ci.preferred_time = ntohl(pinfo->prefered); 5486 ci.valid_time = ntohl(pinfo->valid); 5487 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 5488 goto nla_put_failure; 5489 nlmsg_end(skb, nlh); 5490 return 0; 5491 5492 nla_put_failure: 5493 nlmsg_cancel(skb, nlh); 5494 return -EMSGSIZE; 5495 } 5496 5497 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 5498 struct prefix_info *pinfo) 5499 { 5500 struct sk_buff *skb; 5501 struct net *net = dev_net(idev->dev); 5502 int err = -ENOBUFS; 5503 5504 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 5505 if (!skb) 5506 goto errout; 5507 5508 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5509 if (err < 0) { 5510 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5511 WARN_ON(err == -EMSGSIZE); 5512 kfree_skb(skb); 5513 goto errout; 5514 } 5515 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5516 return; 5517 errout: 5518 if (err < 0) 5519 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 5520 } 5521 5522 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5523 { 5524 struct net *net = dev_net(ifp->idev->dev); 5525 5526 if (event) 5527 ASSERT_RTNL(); 5528 5529 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 5530 5531 switch (event) { 5532 case RTM_NEWADDR: 5533 /* 5534 * If the address was optimistic 5535 * we inserted the route at the start of 5536 * our DAD process, so we don't need 5537 * to do it again 5538 */ 5539 if (!rcu_access_pointer(ifp->rt->rt6i_node)) 5540 ip6_ins_rt(ifp->rt); 5541 if (ifp->idev->cnf.forwarding) 5542 addrconf_join_anycast(ifp); 5543 if (!ipv6_addr_any(&ifp->peer_addr)) 5544 addrconf_prefix_route(&ifp->peer_addr, 128, 5545 ifp->idev->dev, 0, 0); 5546 break; 5547 case RTM_DELADDR: 5548 if (ifp->idev->cnf.forwarding) 5549 addrconf_leave_anycast(ifp); 5550 addrconf_leave_solict(ifp->idev, &ifp->addr); 5551 if (!ipv6_addr_any(&ifp->peer_addr)) { 5552 struct rt6_info *rt; 5553 5554 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 5555 ifp->idev->dev, 0, 0); 5556 if (rt) 5557 ip6_del_rt(rt); 5558 } 5559 if (ifp->rt) { 5560 if (dst_hold_safe(&ifp->rt->dst)) 5561 ip6_del_rt(ifp->rt); 5562 } 5563 rt_genid_bump_ipv6(net); 5564 break; 5565 } 5566 atomic_inc(&net->ipv6.dev_addr_genid); 5567 } 5568 5569 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5570 { 5571 rcu_read_lock_bh(); 5572 if (likely(ifp->idev->dead == 0)) 5573 __ipv6_ifa_notify(event, ifp); 5574 rcu_read_unlock_bh(); 5575 } 5576 5577 #ifdef CONFIG_SYSCTL 5578 5579 static 5580 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 5581 void __user *buffer, size_t *lenp, loff_t *ppos) 5582 { 5583 int *valp = ctl->data; 5584 int val = *valp; 5585 loff_t pos = *ppos; 5586 struct ctl_table lctl; 5587 int ret; 5588 5589 /* 5590 * ctl->data points to idev->cnf.forwarding, we should 5591 * not modify it until we get the rtnl lock. 5592 */ 5593 lctl = *ctl; 5594 lctl.data = &val; 5595 5596 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5597 5598 if (write) 5599 ret = addrconf_fixup_forwarding(ctl, valp, val); 5600 if (ret) 5601 *ppos = pos; 5602 return ret; 5603 } 5604 5605 static 5606 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 5607 void __user *buffer, size_t *lenp, loff_t *ppos) 5608 { 5609 struct inet6_dev *idev = ctl->extra1; 5610 int min_mtu = IPV6_MIN_MTU; 5611 struct ctl_table lctl; 5612 5613 lctl = *ctl; 5614 lctl.extra1 = &min_mtu; 5615 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 5616 5617 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5618 } 5619 5620 static void dev_disable_change(struct inet6_dev *idev) 5621 { 5622 struct netdev_notifier_info info; 5623 5624 if (!idev || !idev->dev) 5625 return; 5626 5627 netdev_notifier_info_init(&info, idev->dev); 5628 if (idev->cnf.disable_ipv6) 5629 addrconf_notify(NULL, NETDEV_DOWN, &info); 5630 else 5631 addrconf_notify(NULL, NETDEV_UP, &info); 5632 } 5633 5634 static void addrconf_disable_change(struct net *net, __s32 newf) 5635 { 5636 struct net_device *dev; 5637 struct inet6_dev *idev; 5638 5639 for_each_netdev(net, dev) { 5640 idev = __in6_dev_get(dev); 5641 if (idev) { 5642 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 5643 idev->cnf.disable_ipv6 = newf; 5644 if (changed) 5645 dev_disable_change(idev); 5646 } 5647 } 5648 } 5649 5650 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 5651 { 5652 struct net *net; 5653 int old; 5654 5655 if (!rtnl_trylock()) 5656 return restart_syscall(); 5657 5658 net = (struct net *)table->extra2; 5659 old = *p; 5660 *p = newf; 5661 5662 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 5663 rtnl_unlock(); 5664 return 0; 5665 } 5666 5667 if (p == &net->ipv6.devconf_all->disable_ipv6) { 5668 net->ipv6.devconf_dflt->disable_ipv6 = newf; 5669 addrconf_disable_change(net, newf); 5670 } else if ((!newf) ^ (!old)) 5671 dev_disable_change((struct inet6_dev *)table->extra1); 5672 5673 rtnl_unlock(); 5674 return 0; 5675 } 5676 5677 static 5678 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 5679 void __user *buffer, size_t *lenp, loff_t *ppos) 5680 { 5681 int *valp = ctl->data; 5682 int val = *valp; 5683 loff_t pos = *ppos; 5684 struct ctl_table lctl; 5685 int ret; 5686 5687 /* 5688 * ctl->data points to idev->cnf.disable_ipv6, we should 5689 * not modify it until we get the rtnl lock. 5690 */ 5691 lctl = *ctl; 5692 lctl.data = &val; 5693 5694 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5695 5696 if (write) 5697 ret = addrconf_disable_ipv6(ctl, valp, val); 5698 if (ret) 5699 *ppos = pos; 5700 return ret; 5701 } 5702 5703 static 5704 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 5705 void __user *buffer, size_t *lenp, loff_t *ppos) 5706 { 5707 int *valp = ctl->data; 5708 int ret; 5709 int old, new; 5710 5711 old = *valp; 5712 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5713 new = *valp; 5714 5715 if (write && old != new) { 5716 struct net *net = ctl->extra2; 5717 5718 if (!rtnl_trylock()) 5719 return restart_syscall(); 5720 5721 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 5722 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5723 NETCONFA_PROXY_NEIGH, 5724 NETCONFA_IFINDEX_DEFAULT, 5725 net->ipv6.devconf_dflt); 5726 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 5727 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5728 NETCONFA_PROXY_NEIGH, 5729 NETCONFA_IFINDEX_ALL, 5730 net->ipv6.devconf_all); 5731 else { 5732 struct inet6_dev *idev = ctl->extra1; 5733 5734 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5735 NETCONFA_PROXY_NEIGH, 5736 idev->dev->ifindex, 5737 &idev->cnf); 5738 } 5739 rtnl_unlock(); 5740 } 5741 5742 return ret; 5743 } 5744 5745 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 5746 void __user *buffer, size_t *lenp, 5747 loff_t *ppos) 5748 { 5749 int ret = 0; 5750 int new_val; 5751 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 5752 struct net *net = (struct net *)ctl->extra2; 5753 5754 if (!rtnl_trylock()) 5755 return restart_syscall(); 5756 5757 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5758 5759 if (write) { 5760 new_val = *((int *)ctl->data); 5761 5762 if (check_addr_gen_mode(new_val) < 0) { 5763 ret = -EINVAL; 5764 goto out; 5765 } 5766 5767 /* request for default */ 5768 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) { 5769 ipv6_devconf_dflt.addr_gen_mode = new_val; 5770 5771 /* request for individual net device */ 5772 } else { 5773 if (!idev) 5774 goto out; 5775 5776 if (check_stable_privacy(idev, net, new_val) < 0) { 5777 ret = -EINVAL; 5778 goto out; 5779 } 5780 5781 if (idev->cnf.addr_gen_mode != new_val) { 5782 idev->cnf.addr_gen_mode = new_val; 5783 addrconf_dev_config(idev->dev); 5784 } 5785 } 5786 } 5787 5788 out: 5789 rtnl_unlock(); 5790 5791 return ret; 5792 } 5793 5794 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 5795 void __user *buffer, size_t *lenp, 5796 loff_t *ppos) 5797 { 5798 int err; 5799 struct in6_addr addr; 5800 char str[IPV6_MAX_STRLEN]; 5801 struct ctl_table lctl = *ctl; 5802 struct net *net = ctl->extra2; 5803 struct ipv6_stable_secret *secret = ctl->data; 5804 5805 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 5806 return -EIO; 5807 5808 lctl.maxlen = IPV6_MAX_STRLEN; 5809 lctl.data = str; 5810 5811 if (!rtnl_trylock()) 5812 return restart_syscall(); 5813 5814 if (!write && !secret->initialized) { 5815 err = -EIO; 5816 goto out; 5817 } 5818 5819 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 5820 if (err >= sizeof(str)) { 5821 err = -EIO; 5822 goto out; 5823 } 5824 5825 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 5826 if (err || !write) 5827 goto out; 5828 5829 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 5830 err = -EIO; 5831 goto out; 5832 } 5833 5834 secret->initialized = true; 5835 secret->secret = addr; 5836 5837 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 5838 struct net_device *dev; 5839 5840 for_each_netdev(net, dev) { 5841 struct inet6_dev *idev = __in6_dev_get(dev); 5842 5843 if (idev) { 5844 idev->cnf.addr_gen_mode = 5845 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5846 } 5847 } 5848 } else { 5849 struct inet6_dev *idev = ctl->extra1; 5850 5851 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5852 } 5853 5854 out: 5855 rtnl_unlock(); 5856 5857 return err; 5858 } 5859 5860 static 5861 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 5862 int write, 5863 void __user *buffer, 5864 size_t *lenp, 5865 loff_t *ppos) 5866 { 5867 int *valp = ctl->data; 5868 int val = *valp; 5869 loff_t pos = *ppos; 5870 struct ctl_table lctl; 5871 int ret; 5872 5873 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 5874 * we should not modify it until we get the rtnl lock. 5875 */ 5876 lctl = *ctl; 5877 lctl.data = &val; 5878 5879 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5880 5881 if (write) 5882 ret = addrconf_fixup_linkdown(ctl, valp, val); 5883 if (ret) 5884 *ppos = pos; 5885 return ret; 5886 } 5887 5888 static 5889 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 5890 { 5891 if (rt) { 5892 if (action) 5893 rt->dst.flags |= DST_NOPOLICY; 5894 else 5895 rt->dst.flags &= ~DST_NOPOLICY; 5896 } 5897 } 5898 5899 static 5900 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 5901 { 5902 struct inet6_ifaddr *ifa; 5903 5904 read_lock_bh(&idev->lock); 5905 list_for_each_entry(ifa, &idev->addr_list, if_list) { 5906 spin_lock(&ifa->lock); 5907 if (ifa->rt) { 5908 struct rt6_info *rt = ifa->rt; 5909 int cpu; 5910 5911 rcu_read_lock(); 5912 addrconf_set_nopolicy(ifa->rt, val); 5913 if (rt->rt6i_pcpu) { 5914 for_each_possible_cpu(cpu) { 5915 struct rt6_info **rtp; 5916 5917 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu); 5918 addrconf_set_nopolicy(*rtp, val); 5919 } 5920 } 5921 rcu_read_unlock(); 5922 } 5923 spin_unlock(&ifa->lock); 5924 } 5925 read_unlock_bh(&idev->lock); 5926 } 5927 5928 static 5929 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 5930 { 5931 struct inet6_dev *idev; 5932 struct net *net; 5933 5934 if (!rtnl_trylock()) 5935 return restart_syscall(); 5936 5937 *valp = val; 5938 5939 net = (struct net *)ctl->extra2; 5940 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 5941 rtnl_unlock(); 5942 return 0; 5943 } 5944 5945 if (valp == &net->ipv6.devconf_all->disable_policy) { 5946 struct net_device *dev; 5947 5948 for_each_netdev(net, dev) { 5949 idev = __in6_dev_get(dev); 5950 if (idev) 5951 addrconf_disable_policy_idev(idev, val); 5952 } 5953 } else { 5954 idev = (struct inet6_dev *)ctl->extra1; 5955 addrconf_disable_policy_idev(idev, val); 5956 } 5957 5958 rtnl_unlock(); 5959 return 0; 5960 } 5961 5962 static 5963 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 5964 void __user *buffer, size_t *lenp, 5965 loff_t *ppos) 5966 { 5967 int *valp = ctl->data; 5968 int val = *valp; 5969 loff_t pos = *ppos; 5970 struct ctl_table lctl; 5971 int ret; 5972 5973 lctl = *ctl; 5974 lctl.data = &val; 5975 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5976 5977 if (write && (*valp != val)) 5978 ret = addrconf_disable_policy(ctl, valp, val); 5979 5980 if (ret) 5981 *ppos = pos; 5982 5983 return ret; 5984 } 5985 5986 static int minus_one = -1; 5987 static const int one = 1; 5988 static const int two_five_five = 255; 5989 5990 static const struct ctl_table addrconf_sysctl[] = { 5991 { 5992 .procname = "forwarding", 5993 .data = &ipv6_devconf.forwarding, 5994 .maxlen = sizeof(int), 5995 .mode = 0644, 5996 .proc_handler = addrconf_sysctl_forward, 5997 }, 5998 { 5999 .procname = "hop_limit", 6000 .data = &ipv6_devconf.hop_limit, 6001 .maxlen = sizeof(int), 6002 .mode = 0644, 6003 .proc_handler = proc_dointvec_minmax, 6004 .extra1 = (void *)&one, 6005 .extra2 = (void *)&two_five_five, 6006 }, 6007 { 6008 .procname = "mtu", 6009 .data = &ipv6_devconf.mtu6, 6010 .maxlen = sizeof(int), 6011 .mode = 0644, 6012 .proc_handler = addrconf_sysctl_mtu, 6013 }, 6014 { 6015 .procname = "accept_ra", 6016 .data = &ipv6_devconf.accept_ra, 6017 .maxlen = sizeof(int), 6018 .mode = 0644, 6019 .proc_handler = proc_dointvec, 6020 }, 6021 { 6022 .procname = "accept_redirects", 6023 .data = &ipv6_devconf.accept_redirects, 6024 .maxlen = sizeof(int), 6025 .mode = 0644, 6026 .proc_handler = proc_dointvec, 6027 }, 6028 { 6029 .procname = "autoconf", 6030 .data = &ipv6_devconf.autoconf, 6031 .maxlen = sizeof(int), 6032 .mode = 0644, 6033 .proc_handler = proc_dointvec, 6034 }, 6035 { 6036 .procname = "dad_transmits", 6037 .data = &ipv6_devconf.dad_transmits, 6038 .maxlen = sizeof(int), 6039 .mode = 0644, 6040 .proc_handler = proc_dointvec, 6041 }, 6042 { 6043 .procname = "router_solicitations", 6044 .data = &ipv6_devconf.rtr_solicits, 6045 .maxlen = sizeof(int), 6046 .mode = 0644, 6047 .proc_handler = proc_dointvec_minmax, 6048 .extra1 = &minus_one, 6049 }, 6050 { 6051 .procname = "router_solicitation_interval", 6052 .data = &ipv6_devconf.rtr_solicit_interval, 6053 .maxlen = sizeof(int), 6054 .mode = 0644, 6055 .proc_handler = proc_dointvec_jiffies, 6056 }, 6057 { 6058 .procname = "router_solicitation_max_interval", 6059 .data = &ipv6_devconf.rtr_solicit_max_interval, 6060 .maxlen = sizeof(int), 6061 .mode = 0644, 6062 .proc_handler = proc_dointvec_jiffies, 6063 }, 6064 { 6065 .procname = "router_solicitation_delay", 6066 .data = &ipv6_devconf.rtr_solicit_delay, 6067 .maxlen = sizeof(int), 6068 .mode = 0644, 6069 .proc_handler = proc_dointvec_jiffies, 6070 }, 6071 { 6072 .procname = "force_mld_version", 6073 .data = &ipv6_devconf.force_mld_version, 6074 .maxlen = sizeof(int), 6075 .mode = 0644, 6076 .proc_handler = proc_dointvec, 6077 }, 6078 { 6079 .procname = "mldv1_unsolicited_report_interval", 6080 .data = 6081 &ipv6_devconf.mldv1_unsolicited_report_interval, 6082 .maxlen = sizeof(int), 6083 .mode = 0644, 6084 .proc_handler = proc_dointvec_ms_jiffies, 6085 }, 6086 { 6087 .procname = "mldv2_unsolicited_report_interval", 6088 .data = 6089 &ipv6_devconf.mldv2_unsolicited_report_interval, 6090 .maxlen = sizeof(int), 6091 .mode = 0644, 6092 .proc_handler = proc_dointvec_ms_jiffies, 6093 }, 6094 { 6095 .procname = "use_tempaddr", 6096 .data = &ipv6_devconf.use_tempaddr, 6097 .maxlen = sizeof(int), 6098 .mode = 0644, 6099 .proc_handler = proc_dointvec, 6100 }, 6101 { 6102 .procname = "temp_valid_lft", 6103 .data = &ipv6_devconf.temp_valid_lft, 6104 .maxlen = sizeof(int), 6105 .mode = 0644, 6106 .proc_handler = proc_dointvec, 6107 }, 6108 { 6109 .procname = "temp_prefered_lft", 6110 .data = &ipv6_devconf.temp_prefered_lft, 6111 .maxlen = sizeof(int), 6112 .mode = 0644, 6113 .proc_handler = proc_dointvec, 6114 }, 6115 { 6116 .procname = "regen_max_retry", 6117 .data = &ipv6_devconf.regen_max_retry, 6118 .maxlen = sizeof(int), 6119 .mode = 0644, 6120 .proc_handler = proc_dointvec, 6121 }, 6122 { 6123 .procname = "max_desync_factor", 6124 .data = &ipv6_devconf.max_desync_factor, 6125 .maxlen = sizeof(int), 6126 .mode = 0644, 6127 .proc_handler = proc_dointvec, 6128 }, 6129 { 6130 .procname = "max_addresses", 6131 .data = &ipv6_devconf.max_addresses, 6132 .maxlen = sizeof(int), 6133 .mode = 0644, 6134 .proc_handler = proc_dointvec, 6135 }, 6136 { 6137 .procname = "accept_ra_defrtr", 6138 .data = &ipv6_devconf.accept_ra_defrtr, 6139 .maxlen = sizeof(int), 6140 .mode = 0644, 6141 .proc_handler = proc_dointvec, 6142 }, 6143 { 6144 .procname = "accept_ra_min_hop_limit", 6145 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6146 .maxlen = sizeof(int), 6147 .mode = 0644, 6148 .proc_handler = proc_dointvec, 6149 }, 6150 { 6151 .procname = "accept_ra_pinfo", 6152 .data = &ipv6_devconf.accept_ra_pinfo, 6153 .maxlen = sizeof(int), 6154 .mode = 0644, 6155 .proc_handler = proc_dointvec, 6156 }, 6157 #ifdef CONFIG_IPV6_ROUTER_PREF 6158 { 6159 .procname = "accept_ra_rtr_pref", 6160 .data = &ipv6_devconf.accept_ra_rtr_pref, 6161 .maxlen = sizeof(int), 6162 .mode = 0644, 6163 .proc_handler = proc_dointvec, 6164 }, 6165 { 6166 .procname = "router_probe_interval", 6167 .data = &ipv6_devconf.rtr_probe_interval, 6168 .maxlen = sizeof(int), 6169 .mode = 0644, 6170 .proc_handler = proc_dointvec_jiffies, 6171 }, 6172 #ifdef CONFIG_IPV6_ROUTE_INFO 6173 { 6174 .procname = "accept_ra_rt_info_min_plen", 6175 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6176 .maxlen = sizeof(int), 6177 .mode = 0644, 6178 .proc_handler = proc_dointvec, 6179 }, 6180 { 6181 .procname = "accept_ra_rt_info_max_plen", 6182 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6183 .maxlen = sizeof(int), 6184 .mode = 0644, 6185 .proc_handler = proc_dointvec, 6186 }, 6187 #endif 6188 #endif 6189 { 6190 .procname = "proxy_ndp", 6191 .data = &ipv6_devconf.proxy_ndp, 6192 .maxlen = sizeof(int), 6193 .mode = 0644, 6194 .proc_handler = addrconf_sysctl_proxy_ndp, 6195 }, 6196 { 6197 .procname = "accept_source_route", 6198 .data = &ipv6_devconf.accept_source_route, 6199 .maxlen = sizeof(int), 6200 .mode = 0644, 6201 .proc_handler = proc_dointvec, 6202 }, 6203 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6204 { 6205 .procname = "optimistic_dad", 6206 .data = &ipv6_devconf.optimistic_dad, 6207 .maxlen = sizeof(int), 6208 .mode = 0644, 6209 .proc_handler = proc_dointvec, 6210 }, 6211 { 6212 .procname = "use_optimistic", 6213 .data = &ipv6_devconf.use_optimistic, 6214 .maxlen = sizeof(int), 6215 .mode = 0644, 6216 .proc_handler = proc_dointvec, 6217 }, 6218 #endif 6219 #ifdef CONFIG_IPV6_MROUTE 6220 { 6221 .procname = "mc_forwarding", 6222 .data = &ipv6_devconf.mc_forwarding, 6223 .maxlen = sizeof(int), 6224 .mode = 0444, 6225 .proc_handler = proc_dointvec, 6226 }, 6227 #endif 6228 { 6229 .procname = "disable_ipv6", 6230 .data = &ipv6_devconf.disable_ipv6, 6231 .maxlen = sizeof(int), 6232 .mode = 0644, 6233 .proc_handler = addrconf_sysctl_disable, 6234 }, 6235 { 6236 .procname = "accept_dad", 6237 .data = &ipv6_devconf.accept_dad, 6238 .maxlen = sizeof(int), 6239 .mode = 0644, 6240 .proc_handler = proc_dointvec, 6241 }, 6242 { 6243 .procname = "force_tllao", 6244 .data = &ipv6_devconf.force_tllao, 6245 .maxlen = sizeof(int), 6246 .mode = 0644, 6247 .proc_handler = proc_dointvec 6248 }, 6249 { 6250 .procname = "ndisc_notify", 6251 .data = &ipv6_devconf.ndisc_notify, 6252 .maxlen = sizeof(int), 6253 .mode = 0644, 6254 .proc_handler = proc_dointvec 6255 }, 6256 { 6257 .procname = "suppress_frag_ndisc", 6258 .data = &ipv6_devconf.suppress_frag_ndisc, 6259 .maxlen = sizeof(int), 6260 .mode = 0644, 6261 .proc_handler = proc_dointvec 6262 }, 6263 { 6264 .procname = "accept_ra_from_local", 6265 .data = &ipv6_devconf.accept_ra_from_local, 6266 .maxlen = sizeof(int), 6267 .mode = 0644, 6268 .proc_handler = proc_dointvec, 6269 }, 6270 { 6271 .procname = "accept_ra_mtu", 6272 .data = &ipv6_devconf.accept_ra_mtu, 6273 .maxlen = sizeof(int), 6274 .mode = 0644, 6275 .proc_handler = proc_dointvec, 6276 }, 6277 { 6278 .procname = "stable_secret", 6279 .data = &ipv6_devconf.stable_secret, 6280 .maxlen = IPV6_MAX_STRLEN, 6281 .mode = 0600, 6282 .proc_handler = addrconf_sysctl_stable_secret, 6283 }, 6284 { 6285 .procname = "use_oif_addrs_only", 6286 .data = &ipv6_devconf.use_oif_addrs_only, 6287 .maxlen = sizeof(int), 6288 .mode = 0644, 6289 .proc_handler = proc_dointvec, 6290 }, 6291 { 6292 .procname = "ignore_routes_with_linkdown", 6293 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6294 .maxlen = sizeof(int), 6295 .mode = 0644, 6296 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6297 }, 6298 { 6299 .procname = "drop_unicast_in_l2_multicast", 6300 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6301 .maxlen = sizeof(int), 6302 .mode = 0644, 6303 .proc_handler = proc_dointvec, 6304 }, 6305 { 6306 .procname = "drop_unsolicited_na", 6307 .data = &ipv6_devconf.drop_unsolicited_na, 6308 .maxlen = sizeof(int), 6309 .mode = 0644, 6310 .proc_handler = proc_dointvec, 6311 }, 6312 { 6313 .procname = "keep_addr_on_down", 6314 .data = &ipv6_devconf.keep_addr_on_down, 6315 .maxlen = sizeof(int), 6316 .mode = 0644, 6317 .proc_handler = proc_dointvec, 6318 6319 }, 6320 { 6321 .procname = "seg6_enabled", 6322 .data = &ipv6_devconf.seg6_enabled, 6323 .maxlen = sizeof(int), 6324 .mode = 0644, 6325 .proc_handler = proc_dointvec, 6326 }, 6327 #ifdef CONFIG_IPV6_SEG6_HMAC 6328 { 6329 .procname = "seg6_require_hmac", 6330 .data = &ipv6_devconf.seg6_require_hmac, 6331 .maxlen = sizeof(int), 6332 .mode = 0644, 6333 .proc_handler = proc_dointvec, 6334 }, 6335 #endif 6336 { 6337 .procname = "enhanced_dad", 6338 .data = &ipv6_devconf.enhanced_dad, 6339 .maxlen = sizeof(int), 6340 .mode = 0644, 6341 .proc_handler = proc_dointvec, 6342 }, 6343 { 6344 .procname = "addr_gen_mode", 6345 .data = &ipv6_devconf.addr_gen_mode, 6346 .maxlen = sizeof(int), 6347 .mode = 0644, 6348 .proc_handler = addrconf_sysctl_addr_gen_mode, 6349 }, 6350 { 6351 .procname = "disable_policy", 6352 .data = &ipv6_devconf.disable_policy, 6353 .maxlen = sizeof(int), 6354 .mode = 0644, 6355 .proc_handler = addrconf_sysctl_disable_policy, 6356 }, 6357 { 6358 /* sentinel */ 6359 } 6360 }; 6361 6362 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 6363 struct inet6_dev *idev, struct ipv6_devconf *p) 6364 { 6365 int i, ifindex; 6366 struct ctl_table *table; 6367 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 6368 6369 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 6370 if (!table) 6371 goto out; 6372 6373 for (i = 0; table[i].data; i++) { 6374 table[i].data += (char *)p - (char *)&ipv6_devconf; 6375 /* If one of these is already set, then it is not safe to 6376 * overwrite either of them: this makes proc_dointvec_minmax 6377 * usable. 6378 */ 6379 if (!table[i].extra1 && !table[i].extra2) { 6380 table[i].extra1 = idev; /* embedded; no ref */ 6381 table[i].extra2 = net; 6382 } 6383 } 6384 6385 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 6386 6387 p->sysctl_header = register_net_sysctl(net, path, table); 6388 if (!p->sysctl_header) 6389 goto free; 6390 6391 if (!strcmp(dev_name, "all")) 6392 ifindex = NETCONFA_IFINDEX_ALL; 6393 else if (!strcmp(dev_name, "default")) 6394 ifindex = NETCONFA_IFINDEX_DEFAULT; 6395 else 6396 ifindex = idev->dev->ifindex; 6397 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 6398 ifindex, p); 6399 return 0; 6400 6401 free: 6402 kfree(table); 6403 out: 6404 return -ENOBUFS; 6405 } 6406 6407 static void __addrconf_sysctl_unregister(struct net *net, 6408 struct ipv6_devconf *p, int ifindex) 6409 { 6410 struct ctl_table *table; 6411 6412 if (!p->sysctl_header) 6413 return; 6414 6415 table = p->sysctl_header->ctl_table_arg; 6416 unregister_net_sysctl_table(p->sysctl_header); 6417 p->sysctl_header = NULL; 6418 kfree(table); 6419 6420 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 6421 } 6422 6423 static int addrconf_sysctl_register(struct inet6_dev *idev) 6424 { 6425 int err; 6426 6427 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 6428 return -EINVAL; 6429 6430 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 6431 &ndisc_ifinfo_sysctl_change); 6432 if (err) 6433 return err; 6434 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 6435 idev, &idev->cnf); 6436 if (err) 6437 neigh_sysctl_unregister(idev->nd_parms); 6438 6439 return err; 6440 } 6441 6442 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 6443 { 6444 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 6445 idev->dev->ifindex); 6446 neigh_sysctl_unregister(idev->nd_parms); 6447 } 6448 6449 6450 #endif 6451 6452 static int __net_init addrconf_init_net(struct net *net) 6453 { 6454 int err = -ENOMEM; 6455 struct ipv6_devconf *all, *dflt; 6456 6457 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 6458 if (!all) 6459 goto err_alloc_all; 6460 6461 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 6462 if (!dflt) 6463 goto err_alloc_dflt; 6464 6465 /* these will be inherited by all namespaces */ 6466 dflt->autoconf = ipv6_defaults.autoconf; 6467 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 6468 6469 dflt->stable_secret.initialized = false; 6470 all->stable_secret.initialized = false; 6471 6472 net->ipv6.devconf_all = all; 6473 net->ipv6.devconf_dflt = dflt; 6474 6475 #ifdef CONFIG_SYSCTL 6476 err = __addrconf_sysctl_register(net, "all", NULL, all); 6477 if (err < 0) 6478 goto err_reg_all; 6479 6480 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 6481 if (err < 0) 6482 goto err_reg_dflt; 6483 #endif 6484 return 0; 6485 6486 #ifdef CONFIG_SYSCTL 6487 err_reg_dflt: 6488 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 6489 err_reg_all: 6490 kfree(dflt); 6491 #endif 6492 err_alloc_dflt: 6493 kfree(all); 6494 err_alloc_all: 6495 return err; 6496 } 6497 6498 static void __net_exit addrconf_exit_net(struct net *net) 6499 { 6500 #ifdef CONFIG_SYSCTL 6501 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 6502 NETCONFA_IFINDEX_DEFAULT); 6503 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 6504 NETCONFA_IFINDEX_ALL); 6505 #endif 6506 kfree(net->ipv6.devconf_dflt); 6507 kfree(net->ipv6.devconf_all); 6508 } 6509 6510 static struct pernet_operations addrconf_ops = { 6511 .init = addrconf_init_net, 6512 .exit = addrconf_exit_net, 6513 }; 6514 6515 static struct rtnl_af_ops inet6_ops __read_mostly = { 6516 .family = AF_INET6, 6517 .fill_link_af = inet6_fill_link_af, 6518 .get_link_af_size = inet6_get_link_af_size, 6519 .validate_link_af = inet6_validate_link_af, 6520 .set_link_af = inet6_set_link_af, 6521 }; 6522 6523 /* 6524 * Init / cleanup code 6525 */ 6526 6527 int __init addrconf_init(void) 6528 { 6529 struct inet6_dev *idev; 6530 int i, err; 6531 6532 err = ipv6_addr_label_init(); 6533 if (err < 0) { 6534 pr_crit("%s: cannot initialize default policy table: %d\n", 6535 __func__, err); 6536 goto out; 6537 } 6538 6539 err = register_pernet_subsys(&addrconf_ops); 6540 if (err < 0) 6541 goto out_addrlabel; 6542 6543 addrconf_wq = create_workqueue("ipv6_addrconf"); 6544 if (!addrconf_wq) { 6545 err = -ENOMEM; 6546 goto out_nowq; 6547 } 6548 6549 /* The addrconf netdev notifier requires that loopback_dev 6550 * has it's ipv6 private information allocated and setup 6551 * before it can bring up and give link-local addresses 6552 * to other devices which are up. 6553 * 6554 * Unfortunately, loopback_dev is not necessarily the first 6555 * entry in the global dev_base list of net devices. In fact, 6556 * it is likely to be the very last entry on that list. 6557 * So this causes the notifier registry below to try and 6558 * give link-local addresses to all devices besides loopback_dev 6559 * first, then loopback_dev, which cases all the non-loopback_dev 6560 * devices to fail to get a link-local address. 6561 * 6562 * So, as a temporary fix, allocate the ipv6 structure for 6563 * loopback_dev first by hand. 6564 * Longer term, all of the dependencies ipv6 has upon the loopback 6565 * device and it being up should be removed. 6566 */ 6567 rtnl_lock(); 6568 idev = ipv6_add_dev(init_net.loopback_dev); 6569 rtnl_unlock(); 6570 if (IS_ERR(idev)) { 6571 err = PTR_ERR(idev); 6572 goto errlo; 6573 } 6574 6575 ip6_route_init_special_entries(); 6576 6577 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6578 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 6579 6580 register_netdevice_notifier(&ipv6_dev_notf); 6581 6582 addrconf_verify(); 6583 6584 rtnl_af_register(&inet6_ops); 6585 6586 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 6587 0); 6588 if (err < 0) 6589 goto errout; 6590 6591 /* Only the first call to __rtnl_register can fail */ 6592 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, 0); 6593 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, 0); 6594 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 6595 inet6_dump_ifaddr, RTNL_FLAG_DOIT_UNLOCKED); 6596 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 6597 inet6_dump_ifmcaddr, 0); 6598 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 6599 inet6_dump_ifacaddr, 0); 6600 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 6601 inet6_netconf_dump_devconf, RTNL_FLAG_DOIT_UNLOCKED); 6602 6603 ipv6_addr_label_rtnl_register(); 6604 6605 return 0; 6606 errout: 6607 rtnl_af_unregister(&inet6_ops); 6608 unregister_netdevice_notifier(&ipv6_dev_notf); 6609 errlo: 6610 destroy_workqueue(addrconf_wq); 6611 out_nowq: 6612 unregister_pernet_subsys(&addrconf_ops); 6613 out_addrlabel: 6614 ipv6_addr_label_cleanup(); 6615 out: 6616 return err; 6617 } 6618 6619 void addrconf_cleanup(void) 6620 { 6621 struct net_device *dev; 6622 int i; 6623 6624 unregister_netdevice_notifier(&ipv6_dev_notf); 6625 unregister_pernet_subsys(&addrconf_ops); 6626 ipv6_addr_label_cleanup(); 6627 6628 rtnl_af_unregister(&inet6_ops); 6629 6630 rtnl_lock(); 6631 6632 /* clean dev list */ 6633 for_each_netdev(&init_net, dev) { 6634 if (__in6_dev_get(dev) == NULL) 6635 continue; 6636 addrconf_ifdown(dev, 1); 6637 } 6638 addrconf_ifdown(init_net.loopback_dev, 2); 6639 6640 /* 6641 * Check hash table. 6642 */ 6643 spin_lock_bh(&addrconf_hash_lock); 6644 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6645 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 6646 spin_unlock_bh(&addrconf_hash_lock); 6647 cancel_delayed_work(&addr_chk_work); 6648 rtnl_unlock(); 6649 6650 destroy_workqueue(addrconf_wq); 6651 } 6652