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 #define INFINITY_LIFE_TIME 0xFFFFFFFF 98 99 #define IPV6_MAX_STRLEN \ 100 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") 101 102 static inline u32 cstamp_delta(unsigned long cstamp) 103 { 104 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 105 } 106 107 static inline s32 rfc3315_s14_backoff_init(s32 irt) 108 { 109 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */ 110 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt; 111 do_div(tmp, 1000000); 112 return (s32)tmp; 113 } 114 115 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt) 116 { 117 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */ 118 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt; 119 do_div(tmp, 1000000); 120 if ((s32)tmp > mrt) { 121 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */ 122 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt; 123 do_div(tmp, 1000000); 124 } 125 return (s32)tmp; 126 } 127 128 #ifdef CONFIG_SYSCTL 129 static int addrconf_sysctl_register(struct inet6_dev *idev); 130 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 131 #else 132 static inline int addrconf_sysctl_register(struct inet6_dev *idev) 133 { 134 return 0; 135 } 136 137 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 138 { 139 } 140 #endif 141 142 static void ipv6_regen_rndid(struct inet6_dev *idev); 143 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 144 145 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 146 static int ipv6_count_addresses(const struct inet6_dev *idev); 147 static int ipv6_generate_stable_address(struct in6_addr *addr, 148 u8 dad_count, 149 const struct inet6_dev *idev); 150 151 #define IN6_ADDR_HSIZE_SHIFT 8 152 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT) 153 /* 154 * Configured unicast address hash table 155 */ 156 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 157 static DEFINE_SPINLOCK(addrconf_hash_lock); 158 159 static void addrconf_verify(void); 160 static void addrconf_verify_rtnl(void); 161 static void addrconf_verify_work(struct work_struct *); 162 163 static struct workqueue_struct *addrconf_wq; 164 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work); 165 166 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 167 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 168 169 static void addrconf_type_change(struct net_device *dev, 170 unsigned long event); 171 static int addrconf_ifdown(struct net_device *dev, int how); 172 173 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 174 int plen, 175 const struct net_device *dev, 176 u32 flags, u32 noflags); 177 178 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 179 static void addrconf_dad_work(struct work_struct *w); 180 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 181 bool send_na); 182 static void addrconf_dad_run(struct inet6_dev *idev); 183 static void addrconf_rs_timer(struct timer_list *t); 184 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 185 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 186 187 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 188 struct prefix_info *pinfo); 189 190 static struct ipv6_devconf ipv6_devconf __read_mostly = { 191 .forwarding = 0, 192 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 193 .mtu6 = IPV6_MIN_MTU, 194 .accept_ra = 1, 195 .accept_redirects = 1, 196 .autoconf = 1, 197 .force_mld_version = 0, 198 .mldv1_unsolicited_report_interval = 10 * HZ, 199 .mldv2_unsolicited_report_interval = HZ, 200 .dad_transmits = 1, 201 .rtr_solicits = MAX_RTR_SOLICITATIONS, 202 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 203 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 204 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 205 .use_tempaddr = 0, 206 .temp_valid_lft = TEMP_VALID_LIFETIME, 207 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 208 .regen_max_retry = REGEN_MAX_RETRY, 209 .max_desync_factor = MAX_DESYNC_FACTOR, 210 .max_addresses = IPV6_MAX_ADDRESSES, 211 .accept_ra_defrtr = 1, 212 .accept_ra_from_local = 0, 213 .accept_ra_min_hop_limit= 1, 214 .accept_ra_pinfo = 1, 215 #ifdef CONFIG_IPV6_ROUTER_PREF 216 .accept_ra_rtr_pref = 1, 217 .rtr_probe_interval = 60 * HZ, 218 #ifdef CONFIG_IPV6_ROUTE_INFO 219 .accept_ra_rt_info_min_plen = 0, 220 .accept_ra_rt_info_max_plen = 0, 221 #endif 222 #endif 223 .proxy_ndp = 0, 224 .accept_source_route = 0, /* we do not accept RH0 by default. */ 225 .disable_ipv6 = 0, 226 .accept_dad = 0, 227 .suppress_frag_ndisc = 1, 228 .accept_ra_mtu = 1, 229 .stable_secret = { 230 .initialized = false, 231 }, 232 .use_oif_addrs_only = 0, 233 .ignore_routes_with_linkdown = 0, 234 .keep_addr_on_down = 0, 235 .seg6_enabled = 0, 236 #ifdef CONFIG_IPV6_SEG6_HMAC 237 .seg6_require_hmac = 0, 238 #endif 239 .enhanced_dad = 1, 240 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 241 .disable_policy = 0, 242 }; 243 244 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 245 .forwarding = 0, 246 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 247 .mtu6 = IPV6_MIN_MTU, 248 .accept_ra = 1, 249 .accept_redirects = 1, 250 .autoconf = 1, 251 .force_mld_version = 0, 252 .mldv1_unsolicited_report_interval = 10 * HZ, 253 .mldv2_unsolicited_report_interval = HZ, 254 .dad_transmits = 1, 255 .rtr_solicits = MAX_RTR_SOLICITATIONS, 256 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 257 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 258 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 259 .use_tempaddr = 0, 260 .temp_valid_lft = TEMP_VALID_LIFETIME, 261 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 262 .regen_max_retry = REGEN_MAX_RETRY, 263 .max_desync_factor = MAX_DESYNC_FACTOR, 264 .max_addresses = IPV6_MAX_ADDRESSES, 265 .accept_ra_defrtr = 1, 266 .accept_ra_from_local = 0, 267 .accept_ra_min_hop_limit= 1, 268 .accept_ra_pinfo = 1, 269 #ifdef CONFIG_IPV6_ROUTER_PREF 270 .accept_ra_rtr_pref = 1, 271 .rtr_probe_interval = 60 * HZ, 272 #ifdef CONFIG_IPV6_ROUTE_INFO 273 .accept_ra_rt_info_min_plen = 0, 274 .accept_ra_rt_info_max_plen = 0, 275 #endif 276 #endif 277 .proxy_ndp = 0, 278 .accept_source_route = 0, /* we do not accept RH0 by default. */ 279 .disable_ipv6 = 0, 280 .accept_dad = 1, 281 .suppress_frag_ndisc = 1, 282 .accept_ra_mtu = 1, 283 .stable_secret = { 284 .initialized = false, 285 }, 286 .use_oif_addrs_only = 0, 287 .ignore_routes_with_linkdown = 0, 288 .keep_addr_on_down = 0, 289 .seg6_enabled = 0, 290 #ifdef CONFIG_IPV6_SEG6_HMAC 291 .seg6_require_hmac = 0, 292 #endif 293 .enhanced_dad = 1, 294 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 295 .disable_policy = 0, 296 }; 297 298 /* Check if link is ready: is it up and is a valid qdisc available */ 299 static inline bool addrconf_link_ready(const struct net_device *dev) 300 { 301 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev); 302 } 303 304 static void addrconf_del_rs_timer(struct inet6_dev *idev) 305 { 306 if (del_timer(&idev->rs_timer)) 307 __in6_dev_put(idev); 308 } 309 310 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 311 { 312 if (cancel_delayed_work(&ifp->dad_work)) 313 __in6_ifa_put(ifp); 314 } 315 316 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 317 unsigned long when) 318 { 319 if (!timer_pending(&idev->rs_timer)) 320 in6_dev_hold(idev); 321 mod_timer(&idev->rs_timer, jiffies + when); 322 } 323 324 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 325 unsigned long delay) 326 { 327 in6_ifa_hold(ifp); 328 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay)) 329 in6_ifa_put(ifp); 330 } 331 332 static int snmp6_alloc_dev(struct inet6_dev *idev) 333 { 334 int i; 335 336 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib); 337 if (!idev->stats.ipv6) 338 goto err_ip; 339 340 for_each_possible_cpu(i) { 341 struct ipstats_mib *addrconf_stats; 342 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 343 u64_stats_init(&addrconf_stats->syncp); 344 } 345 346 347 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 348 GFP_KERNEL); 349 if (!idev->stats.icmpv6dev) 350 goto err_icmp; 351 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 352 GFP_KERNEL); 353 if (!idev->stats.icmpv6msgdev) 354 goto err_icmpmsg; 355 356 return 0; 357 358 err_icmpmsg: 359 kfree(idev->stats.icmpv6dev); 360 err_icmp: 361 free_percpu(idev->stats.ipv6); 362 err_ip: 363 return -ENOMEM; 364 } 365 366 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 367 { 368 struct inet6_dev *ndev; 369 int err = -ENOMEM; 370 371 ASSERT_RTNL(); 372 373 if (dev->mtu < IPV6_MIN_MTU) 374 return ERR_PTR(-EINVAL); 375 376 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 377 if (!ndev) 378 return ERR_PTR(err); 379 380 rwlock_init(&ndev->lock); 381 ndev->dev = dev; 382 INIT_LIST_HEAD(&ndev->addr_list); 383 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0); 384 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 385 386 if (ndev->cnf.stable_secret.initialized) 387 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 388 else 389 ndev->cnf.addr_gen_mode = ipv6_devconf_dflt.addr_gen_mode; 390 391 ndev->cnf.mtu6 = dev->mtu; 392 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 393 if (!ndev->nd_parms) { 394 kfree(ndev); 395 return ERR_PTR(err); 396 } 397 if (ndev->cnf.forwarding) 398 dev_disable_lro(dev); 399 /* We refer to the device */ 400 dev_hold(dev); 401 402 if (snmp6_alloc_dev(ndev) < 0) { 403 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n", 404 __func__); 405 neigh_parms_release(&nd_tbl, ndev->nd_parms); 406 dev_put(dev); 407 kfree(ndev); 408 return ERR_PTR(err); 409 } 410 411 if (snmp6_register_dev(ndev) < 0) { 412 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n", 413 __func__, dev->name); 414 goto err_release; 415 } 416 417 /* One reference from device. */ 418 refcount_set(&ndev->refcnt, 1); 419 420 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 421 ndev->cnf.accept_dad = -1; 422 423 #if IS_ENABLED(CONFIG_IPV6_SIT) 424 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 425 pr_info("%s: Disabled Multicast RS\n", dev->name); 426 ndev->cnf.rtr_solicits = 0; 427 } 428 #endif 429 430 INIT_LIST_HEAD(&ndev->tempaddr_list); 431 ndev->desync_factor = U32_MAX; 432 if ((dev->flags&IFF_LOOPBACK) || 433 dev->type == ARPHRD_TUNNEL || 434 dev->type == ARPHRD_TUNNEL6 || 435 dev->type == ARPHRD_SIT || 436 dev->type == ARPHRD_NONE) { 437 ndev->cnf.use_tempaddr = -1; 438 } else 439 ipv6_regen_rndid(ndev); 440 441 ndev->token = in6addr_any; 442 443 if (netif_running(dev) && addrconf_link_ready(dev)) 444 ndev->if_flags |= IF_READY; 445 446 ipv6_mc_init_dev(ndev); 447 ndev->tstamp = jiffies; 448 err = addrconf_sysctl_register(ndev); 449 if (err) { 450 ipv6_mc_destroy_dev(ndev); 451 snmp6_unregister_dev(ndev); 452 goto err_release; 453 } 454 /* protected by rtnl_lock */ 455 rcu_assign_pointer(dev->ip6_ptr, ndev); 456 457 /* Join interface-local all-node multicast group */ 458 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 459 460 /* Join all-node multicast group */ 461 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 462 463 /* Join all-router multicast group if forwarding is set */ 464 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 465 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 466 467 return ndev; 468 469 err_release: 470 neigh_parms_release(&nd_tbl, ndev->nd_parms); 471 ndev->dead = 1; 472 in6_dev_finish_destroy(ndev); 473 return ERR_PTR(err); 474 } 475 476 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 477 { 478 struct inet6_dev *idev; 479 480 ASSERT_RTNL(); 481 482 idev = __in6_dev_get(dev); 483 if (!idev) { 484 idev = ipv6_add_dev(dev); 485 if (IS_ERR(idev)) 486 return NULL; 487 } 488 489 if (dev->flags&IFF_UP) 490 ipv6_mc_up(idev); 491 return idev; 492 } 493 494 static int inet6_netconf_msgsize_devconf(int type) 495 { 496 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 497 + nla_total_size(4); /* NETCONFA_IFINDEX */ 498 bool all = false; 499 500 if (type == NETCONFA_ALL) 501 all = true; 502 503 if (all || type == NETCONFA_FORWARDING) 504 size += nla_total_size(4); 505 #ifdef CONFIG_IPV6_MROUTE 506 if (all || type == NETCONFA_MC_FORWARDING) 507 size += nla_total_size(4); 508 #endif 509 if (all || type == NETCONFA_PROXY_NEIGH) 510 size += nla_total_size(4); 511 512 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 513 size += nla_total_size(4); 514 515 return size; 516 } 517 518 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 519 struct ipv6_devconf *devconf, u32 portid, 520 u32 seq, int event, unsigned int flags, 521 int type) 522 { 523 struct nlmsghdr *nlh; 524 struct netconfmsg *ncm; 525 bool all = false; 526 527 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 528 flags); 529 if (!nlh) 530 return -EMSGSIZE; 531 532 if (type == NETCONFA_ALL) 533 all = true; 534 535 ncm = nlmsg_data(nlh); 536 ncm->ncm_family = AF_INET6; 537 538 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 539 goto nla_put_failure; 540 541 if (!devconf) 542 goto out; 543 544 if ((all || type == NETCONFA_FORWARDING) && 545 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 546 goto nla_put_failure; 547 #ifdef CONFIG_IPV6_MROUTE 548 if ((all || type == NETCONFA_MC_FORWARDING) && 549 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 550 devconf->mc_forwarding) < 0) 551 goto nla_put_failure; 552 #endif 553 if ((all || type == NETCONFA_PROXY_NEIGH) && 554 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 555 goto nla_put_failure; 556 557 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 558 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 559 devconf->ignore_routes_with_linkdown) < 0) 560 goto nla_put_failure; 561 562 out: 563 nlmsg_end(skb, nlh); 564 return 0; 565 566 nla_put_failure: 567 nlmsg_cancel(skb, nlh); 568 return -EMSGSIZE; 569 } 570 571 void inet6_netconf_notify_devconf(struct net *net, int event, int type, 572 int ifindex, struct ipv6_devconf *devconf) 573 { 574 struct sk_buff *skb; 575 int err = -ENOBUFS; 576 577 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL); 578 if (!skb) 579 goto errout; 580 581 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 582 event, 0, type); 583 if (err < 0) { 584 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 585 WARN_ON(err == -EMSGSIZE); 586 kfree_skb(skb); 587 goto errout; 588 } 589 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL); 590 return; 591 errout: 592 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 593 } 594 595 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 596 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 597 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 598 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 599 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 600 }; 601 602 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 603 struct nlmsghdr *nlh, 604 struct netlink_ext_ack *extack) 605 { 606 struct net *net = sock_net(in_skb->sk); 607 struct nlattr *tb[NETCONFA_MAX+1]; 608 struct inet6_dev *in6_dev = NULL; 609 struct net_device *dev = NULL; 610 struct netconfmsg *ncm; 611 struct sk_buff *skb; 612 struct ipv6_devconf *devconf; 613 int ifindex; 614 int err; 615 616 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, 617 devconf_ipv6_policy, extack); 618 if (err < 0) 619 return err; 620 621 if (!tb[NETCONFA_IFINDEX]) 622 return -EINVAL; 623 624 err = -EINVAL; 625 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 626 switch (ifindex) { 627 case NETCONFA_IFINDEX_ALL: 628 devconf = net->ipv6.devconf_all; 629 break; 630 case NETCONFA_IFINDEX_DEFAULT: 631 devconf = net->ipv6.devconf_dflt; 632 break; 633 default: 634 dev = dev_get_by_index(net, ifindex); 635 if (!dev) 636 return -EINVAL; 637 in6_dev = in6_dev_get(dev); 638 if (!in6_dev) 639 goto errout; 640 devconf = &in6_dev->cnf; 641 break; 642 } 643 644 err = -ENOBUFS; 645 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); 646 if (!skb) 647 goto errout; 648 649 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 650 NETLINK_CB(in_skb).portid, 651 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 652 NETCONFA_ALL); 653 if (err < 0) { 654 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 655 WARN_ON(err == -EMSGSIZE); 656 kfree_skb(skb); 657 goto errout; 658 } 659 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 660 errout: 661 if (in6_dev) 662 in6_dev_put(in6_dev); 663 if (dev) 664 dev_put(dev); 665 return err; 666 } 667 668 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 669 struct netlink_callback *cb) 670 { 671 struct net *net = sock_net(skb->sk); 672 int h, s_h; 673 int idx, s_idx; 674 struct net_device *dev; 675 struct inet6_dev *idev; 676 struct hlist_head *head; 677 678 s_h = cb->args[0]; 679 s_idx = idx = cb->args[1]; 680 681 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 682 idx = 0; 683 head = &net->dev_index_head[h]; 684 rcu_read_lock(); 685 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 686 net->dev_base_seq; 687 hlist_for_each_entry_rcu(dev, head, index_hlist) { 688 if (idx < s_idx) 689 goto cont; 690 idev = __in6_dev_get(dev); 691 if (!idev) 692 goto cont; 693 694 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 695 &idev->cnf, 696 NETLINK_CB(cb->skb).portid, 697 cb->nlh->nlmsg_seq, 698 RTM_NEWNETCONF, 699 NLM_F_MULTI, 700 NETCONFA_ALL) < 0) { 701 rcu_read_unlock(); 702 goto done; 703 } 704 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 705 cont: 706 idx++; 707 } 708 rcu_read_unlock(); 709 } 710 if (h == NETDEV_HASHENTRIES) { 711 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 712 net->ipv6.devconf_all, 713 NETLINK_CB(cb->skb).portid, 714 cb->nlh->nlmsg_seq, 715 RTM_NEWNETCONF, NLM_F_MULTI, 716 NETCONFA_ALL) < 0) 717 goto done; 718 else 719 h++; 720 } 721 if (h == NETDEV_HASHENTRIES + 1) { 722 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 723 net->ipv6.devconf_dflt, 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 done: 733 cb->args[0] = h; 734 cb->args[1] = idx; 735 736 return skb->len; 737 } 738 739 #ifdef CONFIG_SYSCTL 740 static void dev_forward_change(struct inet6_dev *idev) 741 { 742 struct net_device *dev; 743 struct inet6_ifaddr *ifa; 744 745 if (!idev) 746 return; 747 dev = idev->dev; 748 if (idev->cnf.forwarding) 749 dev_disable_lro(dev); 750 if (dev->flags & IFF_MULTICAST) { 751 if (idev->cnf.forwarding) { 752 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 753 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 754 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 755 } else { 756 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 757 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 758 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 759 } 760 } 761 762 list_for_each_entry(ifa, &idev->addr_list, if_list) { 763 if (ifa->flags&IFA_F_TENTATIVE) 764 continue; 765 if (idev->cnf.forwarding) 766 addrconf_join_anycast(ifa); 767 else 768 addrconf_leave_anycast(ifa); 769 } 770 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, 771 NETCONFA_FORWARDING, 772 dev->ifindex, &idev->cnf); 773 } 774 775 776 static void addrconf_forward_change(struct net *net, __s32 newf) 777 { 778 struct net_device *dev; 779 struct inet6_dev *idev; 780 781 for_each_netdev(net, dev) { 782 idev = __in6_dev_get(dev); 783 if (idev) { 784 int changed = (!idev->cnf.forwarding) ^ (!newf); 785 idev->cnf.forwarding = newf; 786 if (changed) 787 dev_forward_change(idev); 788 } 789 } 790 } 791 792 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 793 { 794 struct net *net; 795 int old; 796 797 if (!rtnl_trylock()) 798 return restart_syscall(); 799 800 net = (struct net *)table->extra2; 801 old = *p; 802 *p = newf; 803 804 if (p == &net->ipv6.devconf_dflt->forwarding) { 805 if ((!newf) ^ (!old)) 806 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 807 NETCONFA_FORWARDING, 808 NETCONFA_IFINDEX_DEFAULT, 809 net->ipv6.devconf_dflt); 810 rtnl_unlock(); 811 return 0; 812 } 813 814 if (p == &net->ipv6.devconf_all->forwarding) { 815 int old_dflt = net->ipv6.devconf_dflt->forwarding; 816 817 net->ipv6.devconf_dflt->forwarding = newf; 818 if ((!newf) ^ (!old_dflt)) 819 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 820 NETCONFA_FORWARDING, 821 NETCONFA_IFINDEX_DEFAULT, 822 net->ipv6.devconf_dflt); 823 824 addrconf_forward_change(net, newf); 825 if ((!newf) ^ (!old)) 826 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 827 NETCONFA_FORWARDING, 828 NETCONFA_IFINDEX_ALL, 829 net->ipv6.devconf_all); 830 } else if ((!newf) ^ (!old)) 831 dev_forward_change((struct inet6_dev *)table->extra1); 832 rtnl_unlock(); 833 834 if (newf) 835 rt6_purge_dflt_routers(net); 836 return 1; 837 } 838 839 static void addrconf_linkdown_change(struct net *net, __s32 newf) 840 { 841 struct net_device *dev; 842 struct inet6_dev *idev; 843 844 for_each_netdev(net, dev) { 845 idev = __in6_dev_get(dev); 846 if (idev) { 847 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 848 849 idev->cnf.ignore_routes_with_linkdown = newf; 850 if (changed) 851 inet6_netconf_notify_devconf(dev_net(dev), 852 RTM_NEWNETCONF, 853 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 854 dev->ifindex, 855 &idev->cnf); 856 } 857 } 858 } 859 860 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 861 { 862 struct net *net; 863 int old; 864 865 if (!rtnl_trylock()) 866 return restart_syscall(); 867 868 net = (struct net *)table->extra2; 869 old = *p; 870 *p = newf; 871 872 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 873 if ((!newf) ^ (!old)) 874 inet6_netconf_notify_devconf(net, 875 RTM_NEWNETCONF, 876 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 877 NETCONFA_IFINDEX_DEFAULT, 878 net->ipv6.devconf_dflt); 879 rtnl_unlock(); 880 return 0; 881 } 882 883 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 884 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 885 addrconf_linkdown_change(net, newf); 886 if ((!newf) ^ (!old)) 887 inet6_netconf_notify_devconf(net, 888 RTM_NEWNETCONF, 889 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 890 NETCONFA_IFINDEX_ALL, 891 net->ipv6.devconf_all); 892 } 893 rtnl_unlock(); 894 895 return 1; 896 } 897 898 #endif 899 900 /* Nobody refers to this ifaddr, destroy it */ 901 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 902 { 903 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 904 905 #ifdef NET_REFCNT_DEBUG 906 pr_debug("%s\n", __func__); 907 #endif 908 909 in6_dev_put(ifp->idev); 910 911 if (cancel_delayed_work(&ifp->dad_work)) 912 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 913 ifp); 914 915 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 916 pr_warn("Freeing alive inet6 address %p\n", ifp); 917 return; 918 } 919 920 kfree_rcu(ifp, rcu); 921 } 922 923 static void 924 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 925 { 926 struct list_head *p; 927 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 928 929 /* 930 * Each device address list is sorted in order of scope - 931 * global before linklocal. 932 */ 933 list_for_each(p, &idev->addr_list) { 934 struct inet6_ifaddr *ifa 935 = list_entry(p, struct inet6_ifaddr, if_list); 936 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 937 break; 938 } 939 940 list_add_tail_rcu(&ifp->if_list, p); 941 } 942 943 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr) 944 { 945 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net); 946 947 return hash_32(val, IN6_ADDR_HSIZE_SHIFT); 948 } 949 950 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 951 struct net_device *dev, unsigned int hash) 952 { 953 struct inet6_ifaddr *ifp; 954 955 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 956 if (!net_eq(dev_net(ifp->idev->dev), net)) 957 continue; 958 if (ipv6_addr_equal(&ifp->addr, addr)) { 959 if (!dev || ifp->idev->dev == dev) 960 return true; 961 } 962 } 963 return false; 964 } 965 966 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa) 967 { 968 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr); 969 int err = 0; 970 971 spin_lock(&addrconf_hash_lock); 972 973 /* Ignore adding duplicate addresses on an interface */ 974 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) { 975 netdev_dbg(dev, "ipv6_add_addr: already assigned\n"); 976 err = -EEXIST; 977 } else { 978 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 979 } 980 981 spin_unlock(&addrconf_hash_lock); 982 983 return err; 984 } 985 986 /* On success it returns ifp with increased reference count */ 987 988 static struct inet6_ifaddr * 989 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 990 const struct in6_addr *peer_addr, int pfxlen, 991 int scope, u32 flags, u32 valid_lft, u32 prefered_lft, 992 bool can_block, struct netlink_ext_ack *extack) 993 { 994 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC; 995 struct net *net = dev_net(idev->dev); 996 struct inet6_ifaddr *ifa = NULL; 997 struct fib6_info *f6i = NULL; 998 int err = 0; 999 int addr_type = ipv6_addr_type(addr); 1000 1001 if (addr_type == IPV6_ADDR_ANY || 1002 addr_type & IPV6_ADDR_MULTICAST || 1003 (!(idev->dev->flags & IFF_LOOPBACK) && 1004 addr_type & IPV6_ADDR_LOOPBACK)) 1005 return ERR_PTR(-EADDRNOTAVAIL); 1006 1007 if (idev->dead) { 1008 err = -ENODEV; /*XXX*/ 1009 goto out; 1010 } 1011 1012 if (idev->cnf.disable_ipv6) { 1013 err = -EACCES; 1014 goto out; 1015 } 1016 1017 /* validator notifier needs to be blocking; 1018 * do not call in atomic context 1019 */ 1020 if (can_block) { 1021 struct in6_validator_info i6vi = { 1022 .i6vi_addr = *addr, 1023 .i6vi_dev = idev, 1024 .extack = extack, 1025 }; 1026 1027 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi); 1028 err = notifier_to_errno(err); 1029 if (err < 0) 1030 goto out; 1031 } 1032 1033 ifa = kzalloc(sizeof(*ifa), gfp_flags); 1034 if (!ifa) { 1035 err = -ENOBUFS; 1036 goto out; 1037 } 1038 1039 f6i = addrconf_f6i_alloc(net, idev, addr, false, gfp_flags); 1040 if (IS_ERR(f6i)) { 1041 err = PTR_ERR(f6i); 1042 f6i = NULL; 1043 goto out; 1044 } 1045 1046 if (net->ipv6.devconf_all->disable_policy || 1047 idev->cnf.disable_policy) 1048 f6i->dst_nopolicy = true; 1049 1050 neigh_parms_data_state_setall(idev->nd_parms); 1051 1052 ifa->addr = *addr; 1053 if (peer_addr) 1054 ifa->peer_addr = *peer_addr; 1055 1056 spin_lock_init(&ifa->lock); 1057 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1058 INIT_HLIST_NODE(&ifa->addr_lst); 1059 ifa->scope = scope; 1060 ifa->prefix_len = pfxlen; 1061 ifa->flags = flags; 1062 /* No need to add the TENTATIVE flag for addresses with NODAD */ 1063 if (!(flags & IFA_F_NODAD)) 1064 ifa->flags |= IFA_F_TENTATIVE; 1065 ifa->valid_lft = valid_lft; 1066 ifa->prefered_lft = prefered_lft; 1067 ifa->cstamp = ifa->tstamp = jiffies; 1068 ifa->tokenized = false; 1069 1070 ifa->rt = f6i; 1071 1072 ifa->idev = idev; 1073 in6_dev_hold(idev); 1074 1075 /* For caller */ 1076 refcount_set(&ifa->refcnt, 1); 1077 1078 rcu_read_lock_bh(); 1079 1080 err = ipv6_add_addr_hash(idev->dev, ifa); 1081 if (err < 0) { 1082 rcu_read_unlock_bh(); 1083 goto out; 1084 } 1085 1086 write_lock(&idev->lock); 1087 1088 /* Add to inet6_dev unicast addr list. */ 1089 ipv6_link_dev_addr(idev, ifa); 1090 1091 if (ifa->flags&IFA_F_TEMPORARY) { 1092 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1093 in6_ifa_hold(ifa); 1094 } 1095 1096 in6_ifa_hold(ifa); 1097 write_unlock(&idev->lock); 1098 1099 rcu_read_unlock_bh(); 1100 1101 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1102 out: 1103 if (unlikely(err < 0)) { 1104 fib6_info_release(f6i); 1105 1106 if (ifa) { 1107 if (ifa->idev) 1108 in6_dev_put(ifa->idev); 1109 kfree(ifa); 1110 } 1111 ifa = ERR_PTR(err); 1112 } 1113 1114 return ifa; 1115 } 1116 1117 enum cleanup_prefix_rt_t { 1118 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1119 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1120 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1121 }; 1122 1123 /* 1124 * Check, whether the prefix for ifp would still need a prefix route 1125 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1126 * constants. 1127 * 1128 * 1) we don't purge prefix if address was not permanent. 1129 * prefix is managed by its own lifetime. 1130 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1131 * 3) if there are no addresses, delete prefix. 1132 * 4) if there are still other permanent address(es), 1133 * corresponding prefix is still permanent. 1134 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1135 * don't purge the prefix, assume user space is managing it. 1136 * 6) otherwise, update prefix lifetime to the 1137 * longest valid lifetime among the corresponding 1138 * addresses on the device. 1139 * Note: subsequent RA will update lifetime. 1140 **/ 1141 static enum cleanup_prefix_rt_t 1142 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1143 { 1144 struct inet6_ifaddr *ifa; 1145 struct inet6_dev *idev = ifp->idev; 1146 unsigned long lifetime; 1147 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1148 1149 *expires = jiffies; 1150 1151 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1152 if (ifa == ifp) 1153 continue; 1154 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1155 ifp->prefix_len)) 1156 continue; 1157 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1158 return CLEANUP_PREFIX_RT_NOP; 1159 1160 action = CLEANUP_PREFIX_RT_EXPIRE; 1161 1162 spin_lock(&ifa->lock); 1163 1164 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1165 /* 1166 * Note: Because this address is 1167 * not permanent, lifetime < 1168 * LONG_MAX / HZ here. 1169 */ 1170 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1171 *expires = ifa->tstamp + lifetime * HZ; 1172 spin_unlock(&ifa->lock); 1173 } 1174 1175 return action; 1176 } 1177 1178 static void 1179 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt) 1180 { 1181 struct fib6_info *f6i; 1182 1183 f6i = addrconf_get_prefix_route(&ifp->addr, 1184 ifp->prefix_len, 1185 ifp->idev->dev, 1186 0, RTF_GATEWAY | RTF_DEFAULT); 1187 if (f6i) { 1188 if (del_rt) 1189 ip6_del_rt(dev_net(ifp->idev->dev), f6i); 1190 else { 1191 if (!(f6i->fib6_flags & RTF_EXPIRES)) 1192 fib6_set_expires(f6i, expires); 1193 fib6_info_release(f6i); 1194 } 1195 } 1196 } 1197 1198 1199 /* This function wants to get referenced ifp and releases it before return */ 1200 1201 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1202 { 1203 int state; 1204 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1205 unsigned long expires; 1206 1207 ASSERT_RTNL(); 1208 1209 spin_lock_bh(&ifp->lock); 1210 state = ifp->state; 1211 ifp->state = INET6_IFADDR_STATE_DEAD; 1212 spin_unlock_bh(&ifp->lock); 1213 1214 if (state == INET6_IFADDR_STATE_DEAD) 1215 goto out; 1216 1217 spin_lock_bh(&addrconf_hash_lock); 1218 hlist_del_init_rcu(&ifp->addr_lst); 1219 spin_unlock_bh(&addrconf_hash_lock); 1220 1221 write_lock_bh(&ifp->idev->lock); 1222 1223 if (ifp->flags&IFA_F_TEMPORARY) { 1224 list_del(&ifp->tmp_list); 1225 if (ifp->ifpub) { 1226 in6_ifa_put(ifp->ifpub); 1227 ifp->ifpub = NULL; 1228 } 1229 __in6_ifa_put(ifp); 1230 } 1231 1232 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1233 action = check_cleanup_prefix_route(ifp, &expires); 1234 1235 list_del_rcu(&ifp->if_list); 1236 __in6_ifa_put(ifp); 1237 1238 write_unlock_bh(&ifp->idev->lock); 1239 1240 addrconf_del_dad_work(ifp); 1241 1242 ipv6_ifa_notify(RTM_DELADDR, ifp); 1243 1244 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1245 1246 if (action != CLEANUP_PREFIX_RT_NOP) { 1247 cleanup_prefix_route(ifp, expires, 1248 action == CLEANUP_PREFIX_RT_DEL); 1249 } 1250 1251 /* clean up prefsrc entries */ 1252 rt6_remove_prefsrc(ifp); 1253 out: 1254 in6_ifa_put(ifp); 1255 } 1256 1257 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, 1258 struct inet6_ifaddr *ift, 1259 bool block) 1260 { 1261 struct inet6_dev *idev = ifp->idev; 1262 struct in6_addr addr, *tmpaddr; 1263 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 1264 unsigned long regen_advance; 1265 int tmp_plen; 1266 int ret = 0; 1267 u32 addr_flags; 1268 unsigned long now = jiffies; 1269 long max_desync_factor; 1270 s32 cnf_temp_preferred_lft; 1271 1272 write_lock_bh(&idev->lock); 1273 if (ift) { 1274 spin_lock_bh(&ift->lock); 1275 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1276 spin_unlock_bh(&ift->lock); 1277 tmpaddr = &addr; 1278 } else { 1279 tmpaddr = NULL; 1280 } 1281 retry: 1282 in6_dev_hold(idev); 1283 if (idev->cnf.use_tempaddr <= 0) { 1284 write_unlock_bh(&idev->lock); 1285 pr_info("%s: use_tempaddr is disabled\n", __func__); 1286 in6_dev_put(idev); 1287 ret = -1; 1288 goto out; 1289 } 1290 spin_lock_bh(&ifp->lock); 1291 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1292 idev->cnf.use_tempaddr = -1; /*XXX*/ 1293 spin_unlock_bh(&ifp->lock); 1294 write_unlock_bh(&idev->lock); 1295 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1296 __func__); 1297 in6_dev_put(idev); 1298 ret = -1; 1299 goto out; 1300 } 1301 in6_ifa_hold(ifp); 1302 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1303 ipv6_try_regen_rndid(idev, tmpaddr); 1304 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1305 age = (now - ifp->tstamp) / HZ; 1306 1307 regen_advance = idev->cnf.regen_max_retry * 1308 idev->cnf.dad_transmits * 1309 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ; 1310 1311 /* recalculate max_desync_factor each time and update 1312 * idev->desync_factor if it's larger 1313 */ 1314 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1315 max_desync_factor = min_t(__u32, 1316 idev->cnf.max_desync_factor, 1317 cnf_temp_preferred_lft - regen_advance); 1318 1319 if (unlikely(idev->desync_factor > max_desync_factor)) { 1320 if (max_desync_factor > 0) { 1321 get_random_bytes(&idev->desync_factor, 1322 sizeof(idev->desync_factor)); 1323 idev->desync_factor %= max_desync_factor; 1324 } else { 1325 idev->desync_factor = 0; 1326 } 1327 } 1328 1329 tmp_valid_lft = min_t(__u32, 1330 ifp->valid_lft, 1331 idev->cnf.temp_valid_lft + age); 1332 tmp_prefered_lft = cnf_temp_preferred_lft + age - 1333 idev->desync_factor; 1334 tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft); 1335 tmp_plen = ifp->prefix_len; 1336 tmp_tstamp = ifp->tstamp; 1337 spin_unlock_bh(&ifp->lock); 1338 1339 write_unlock_bh(&idev->lock); 1340 1341 /* A temporary address is created only if this calculated Preferred 1342 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1343 * an implementation must not create a temporary address with a zero 1344 * Preferred Lifetime. 1345 * Use age calculation as in addrconf_verify to avoid unnecessary 1346 * temporary addresses being generated. 1347 */ 1348 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1349 if (tmp_prefered_lft <= regen_advance + age) { 1350 in6_ifa_put(ifp); 1351 in6_dev_put(idev); 1352 ret = -1; 1353 goto out; 1354 } 1355 1356 addr_flags = IFA_F_TEMPORARY; 1357 /* set in addrconf_prefix_rcv() */ 1358 if (ifp->flags & IFA_F_OPTIMISTIC) 1359 addr_flags |= IFA_F_OPTIMISTIC; 1360 1361 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen, 1362 ipv6_addr_scope(&addr), addr_flags, 1363 tmp_valid_lft, tmp_prefered_lft, block, NULL); 1364 if (IS_ERR(ift)) { 1365 in6_ifa_put(ifp); 1366 in6_dev_put(idev); 1367 pr_info("%s: retry temporary address regeneration\n", __func__); 1368 tmpaddr = &addr; 1369 write_lock_bh(&idev->lock); 1370 goto retry; 1371 } 1372 1373 spin_lock_bh(&ift->lock); 1374 ift->ifpub = ifp; 1375 ift->cstamp = now; 1376 ift->tstamp = tmp_tstamp; 1377 spin_unlock_bh(&ift->lock); 1378 1379 addrconf_dad_start(ift); 1380 in6_ifa_put(ift); 1381 in6_dev_put(idev); 1382 out: 1383 return ret; 1384 } 1385 1386 /* 1387 * Choose an appropriate source address (RFC3484) 1388 */ 1389 enum { 1390 IPV6_SADDR_RULE_INIT = 0, 1391 IPV6_SADDR_RULE_LOCAL, 1392 IPV6_SADDR_RULE_SCOPE, 1393 IPV6_SADDR_RULE_PREFERRED, 1394 #ifdef CONFIG_IPV6_MIP6 1395 IPV6_SADDR_RULE_HOA, 1396 #endif 1397 IPV6_SADDR_RULE_OIF, 1398 IPV6_SADDR_RULE_LABEL, 1399 IPV6_SADDR_RULE_PRIVACY, 1400 IPV6_SADDR_RULE_ORCHID, 1401 IPV6_SADDR_RULE_PREFIX, 1402 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1403 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1404 #endif 1405 IPV6_SADDR_RULE_MAX 1406 }; 1407 1408 struct ipv6_saddr_score { 1409 int rule; 1410 int addr_type; 1411 struct inet6_ifaddr *ifa; 1412 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1413 int scopedist; 1414 int matchlen; 1415 }; 1416 1417 struct ipv6_saddr_dst { 1418 const struct in6_addr *addr; 1419 int ifindex; 1420 int scope; 1421 int label; 1422 unsigned int prefs; 1423 }; 1424 1425 static inline int ipv6_saddr_preferred(int type) 1426 { 1427 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1428 return 1; 1429 return 0; 1430 } 1431 1432 static bool ipv6_use_optimistic_addr(struct net *net, 1433 struct inet6_dev *idev) 1434 { 1435 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1436 if (!idev) 1437 return false; 1438 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1439 return false; 1440 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic) 1441 return false; 1442 1443 return true; 1444 #else 1445 return false; 1446 #endif 1447 } 1448 1449 static bool ipv6_allow_optimistic_dad(struct net *net, 1450 struct inet6_dev *idev) 1451 { 1452 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1453 if (!idev) 1454 return false; 1455 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1456 return false; 1457 1458 return true; 1459 #else 1460 return false; 1461 #endif 1462 } 1463 1464 static int ipv6_get_saddr_eval(struct net *net, 1465 struct ipv6_saddr_score *score, 1466 struct ipv6_saddr_dst *dst, 1467 int i) 1468 { 1469 int ret; 1470 1471 if (i <= score->rule) { 1472 switch (i) { 1473 case IPV6_SADDR_RULE_SCOPE: 1474 ret = score->scopedist; 1475 break; 1476 case IPV6_SADDR_RULE_PREFIX: 1477 ret = score->matchlen; 1478 break; 1479 default: 1480 ret = !!test_bit(i, score->scorebits); 1481 } 1482 goto out; 1483 } 1484 1485 switch (i) { 1486 case IPV6_SADDR_RULE_INIT: 1487 /* Rule 0: remember if hiscore is not ready yet */ 1488 ret = !!score->ifa; 1489 break; 1490 case IPV6_SADDR_RULE_LOCAL: 1491 /* Rule 1: Prefer same address */ 1492 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1493 break; 1494 case IPV6_SADDR_RULE_SCOPE: 1495 /* Rule 2: Prefer appropriate scope 1496 * 1497 * ret 1498 * ^ 1499 * -1 | d 15 1500 * ---+--+-+---> scope 1501 * | 1502 * | d is scope of the destination. 1503 * B-d | \ 1504 * | \ <- smaller scope is better if 1505 * B-15 | \ if scope is enough for destination. 1506 * | ret = B - scope (-1 <= scope >= d <= 15). 1507 * d-C-1 | / 1508 * |/ <- greater is better 1509 * -C / if scope is not enough for destination. 1510 * /| ret = scope - C (-1 <= d < scope <= 15). 1511 * 1512 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1513 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1514 * Assume B = 0 and we get C > 29. 1515 */ 1516 ret = __ipv6_addr_src_scope(score->addr_type); 1517 if (ret >= dst->scope) 1518 ret = -ret; 1519 else 1520 ret -= 128; /* 30 is enough */ 1521 score->scopedist = ret; 1522 break; 1523 case IPV6_SADDR_RULE_PREFERRED: 1524 { 1525 /* Rule 3: Avoid deprecated and optimistic addresses */ 1526 u8 avoid = IFA_F_DEPRECATED; 1527 1528 if (!ipv6_use_optimistic_addr(net, score->ifa->idev)) 1529 avoid |= IFA_F_OPTIMISTIC; 1530 ret = ipv6_saddr_preferred(score->addr_type) || 1531 !(score->ifa->flags & avoid); 1532 break; 1533 } 1534 #ifdef CONFIG_IPV6_MIP6 1535 case IPV6_SADDR_RULE_HOA: 1536 { 1537 /* Rule 4: Prefer home address */ 1538 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1539 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1540 break; 1541 } 1542 #endif 1543 case IPV6_SADDR_RULE_OIF: 1544 /* Rule 5: Prefer outgoing interface */ 1545 ret = (!dst->ifindex || 1546 dst->ifindex == score->ifa->idev->dev->ifindex); 1547 break; 1548 case IPV6_SADDR_RULE_LABEL: 1549 /* Rule 6: Prefer matching label */ 1550 ret = ipv6_addr_label(net, 1551 &score->ifa->addr, score->addr_type, 1552 score->ifa->idev->dev->ifindex) == dst->label; 1553 break; 1554 case IPV6_SADDR_RULE_PRIVACY: 1555 { 1556 /* Rule 7: Prefer public address 1557 * Note: prefer temporary address if use_tempaddr >= 2 1558 */ 1559 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1560 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1561 score->ifa->idev->cnf.use_tempaddr >= 2; 1562 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1563 break; 1564 } 1565 case IPV6_SADDR_RULE_ORCHID: 1566 /* Rule 8-: Prefer ORCHID vs ORCHID or 1567 * non-ORCHID vs non-ORCHID 1568 */ 1569 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1570 ipv6_addr_orchid(dst->addr)); 1571 break; 1572 case IPV6_SADDR_RULE_PREFIX: 1573 /* Rule 8: Use longest matching prefix */ 1574 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1575 if (ret > score->ifa->prefix_len) 1576 ret = score->ifa->prefix_len; 1577 score->matchlen = ret; 1578 break; 1579 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1580 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1581 /* Optimistic addresses still have lower precedence than other 1582 * preferred addresses. 1583 */ 1584 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1585 break; 1586 #endif 1587 default: 1588 ret = 0; 1589 } 1590 1591 if (ret) 1592 __set_bit(i, score->scorebits); 1593 score->rule = i; 1594 out: 1595 return ret; 1596 } 1597 1598 static int __ipv6_dev_get_saddr(struct net *net, 1599 struct ipv6_saddr_dst *dst, 1600 struct inet6_dev *idev, 1601 struct ipv6_saddr_score *scores, 1602 int hiscore_idx) 1603 { 1604 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1605 1606 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) { 1607 int i; 1608 1609 /* 1610 * - Tentative Address (RFC2462 section 5.4) 1611 * - A tentative address is not considered 1612 * "assigned to an interface" in the traditional 1613 * sense, unless it is also flagged as optimistic. 1614 * - Candidate Source Address (section 4) 1615 * - In any case, anycast addresses, multicast 1616 * addresses, and the unspecified address MUST 1617 * NOT be included in a candidate set. 1618 */ 1619 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1620 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1621 continue; 1622 1623 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1624 1625 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1626 score->addr_type & IPV6_ADDR_MULTICAST)) { 1627 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1628 idev->dev->name); 1629 continue; 1630 } 1631 1632 score->rule = -1; 1633 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1634 1635 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1636 int minihiscore, miniscore; 1637 1638 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1639 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1640 1641 if (minihiscore > miniscore) { 1642 if (i == IPV6_SADDR_RULE_SCOPE && 1643 score->scopedist > 0) { 1644 /* 1645 * special case: 1646 * each remaining entry 1647 * has too small (not enough) 1648 * scope, because ifa entries 1649 * are sorted by their scope 1650 * values. 1651 */ 1652 goto out; 1653 } 1654 break; 1655 } else if (minihiscore < miniscore) { 1656 swap(hiscore, score); 1657 hiscore_idx = 1 - hiscore_idx; 1658 1659 /* restore our iterator */ 1660 score->ifa = hiscore->ifa; 1661 1662 break; 1663 } 1664 } 1665 } 1666 out: 1667 return hiscore_idx; 1668 } 1669 1670 static int ipv6_get_saddr_master(struct net *net, 1671 const struct net_device *dst_dev, 1672 const struct net_device *master, 1673 struct ipv6_saddr_dst *dst, 1674 struct ipv6_saddr_score *scores, 1675 int hiscore_idx) 1676 { 1677 struct inet6_dev *idev; 1678 1679 idev = __in6_dev_get(dst_dev); 1680 if (idev) 1681 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1682 scores, hiscore_idx); 1683 1684 idev = __in6_dev_get(master); 1685 if (idev) 1686 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1687 scores, hiscore_idx); 1688 1689 return hiscore_idx; 1690 } 1691 1692 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1693 const struct in6_addr *daddr, unsigned int prefs, 1694 struct in6_addr *saddr) 1695 { 1696 struct ipv6_saddr_score scores[2], *hiscore; 1697 struct ipv6_saddr_dst dst; 1698 struct inet6_dev *idev; 1699 struct net_device *dev; 1700 int dst_type; 1701 bool use_oif_addr = false; 1702 int hiscore_idx = 0; 1703 int ret = 0; 1704 1705 dst_type = __ipv6_addr_type(daddr); 1706 dst.addr = daddr; 1707 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1708 dst.scope = __ipv6_addr_src_scope(dst_type); 1709 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1710 dst.prefs = prefs; 1711 1712 scores[hiscore_idx].rule = -1; 1713 scores[hiscore_idx].ifa = NULL; 1714 1715 rcu_read_lock(); 1716 1717 /* Candidate Source Address (section 4) 1718 * - multicast and link-local destination address, 1719 * the set of candidate source address MUST only 1720 * include addresses assigned to interfaces 1721 * belonging to the same link as the outgoing 1722 * interface. 1723 * (- For site-local destination addresses, the 1724 * set of candidate source addresses MUST only 1725 * include addresses assigned to interfaces 1726 * belonging to the same site as the outgoing 1727 * interface.) 1728 * - "It is RECOMMENDED that the candidate source addresses 1729 * be the set of unicast addresses assigned to the 1730 * interface that will be used to send to the destination 1731 * (the 'outgoing' interface)." (RFC 6724) 1732 */ 1733 if (dst_dev) { 1734 idev = __in6_dev_get(dst_dev); 1735 if ((dst_type & IPV6_ADDR_MULTICAST) || 1736 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1737 (idev && idev->cnf.use_oif_addrs_only)) { 1738 use_oif_addr = true; 1739 } 1740 } 1741 1742 if (use_oif_addr) { 1743 if (idev) 1744 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1745 } else { 1746 const struct net_device *master; 1747 int master_idx = 0; 1748 1749 /* if dst_dev exists and is enslaved to an L3 device, then 1750 * prefer addresses from dst_dev and then the master over 1751 * any other enslaved devices in the L3 domain. 1752 */ 1753 master = l3mdev_master_dev_rcu(dst_dev); 1754 if (master) { 1755 master_idx = master->ifindex; 1756 1757 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1758 master, &dst, 1759 scores, hiscore_idx); 1760 1761 if (scores[hiscore_idx].ifa) 1762 goto out; 1763 } 1764 1765 for_each_netdev_rcu(net, dev) { 1766 /* only consider addresses on devices in the 1767 * same L3 domain 1768 */ 1769 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1770 continue; 1771 idev = __in6_dev_get(dev); 1772 if (!idev) 1773 continue; 1774 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1775 } 1776 } 1777 1778 out: 1779 hiscore = &scores[hiscore_idx]; 1780 if (!hiscore->ifa) 1781 ret = -EADDRNOTAVAIL; 1782 else 1783 *saddr = hiscore->ifa->addr; 1784 1785 rcu_read_unlock(); 1786 return ret; 1787 } 1788 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1789 1790 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1791 u32 banned_flags) 1792 { 1793 struct inet6_ifaddr *ifp; 1794 int err = -EADDRNOTAVAIL; 1795 1796 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1797 if (ifp->scope > IFA_LINK) 1798 break; 1799 if (ifp->scope == IFA_LINK && 1800 !(ifp->flags & banned_flags)) { 1801 *addr = ifp->addr; 1802 err = 0; 1803 break; 1804 } 1805 } 1806 return err; 1807 } 1808 1809 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1810 u32 banned_flags) 1811 { 1812 struct inet6_dev *idev; 1813 int err = -EADDRNOTAVAIL; 1814 1815 rcu_read_lock(); 1816 idev = __in6_dev_get(dev); 1817 if (idev) { 1818 read_lock_bh(&idev->lock); 1819 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1820 read_unlock_bh(&idev->lock); 1821 } 1822 rcu_read_unlock(); 1823 return err; 1824 } 1825 1826 static int ipv6_count_addresses(const struct inet6_dev *idev) 1827 { 1828 const struct inet6_ifaddr *ifp; 1829 int cnt = 0; 1830 1831 rcu_read_lock(); 1832 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list) 1833 cnt++; 1834 rcu_read_unlock(); 1835 return cnt; 1836 } 1837 1838 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1839 const struct net_device *dev, int strict) 1840 { 1841 return ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1842 strict, IFA_F_TENTATIVE); 1843 } 1844 EXPORT_SYMBOL(ipv6_chk_addr); 1845 1846 /* device argument is used to find the L3 domain of interest. If 1847 * skip_dev_check is set, then the ifp device is not checked against 1848 * the passed in dev argument. So the 2 cases for addresses checks are: 1849 * 1. does the address exist in the L3 domain that dev is part of 1850 * (skip_dev_check = true), or 1851 * 1852 * 2. does the address exist on the specific device 1853 * (skip_dev_check = false) 1854 */ 1855 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1856 const struct net_device *dev, bool skip_dev_check, 1857 int strict, u32 banned_flags) 1858 { 1859 unsigned int hash = inet6_addr_hash(net, addr); 1860 const struct net_device *l3mdev; 1861 struct inet6_ifaddr *ifp; 1862 u32 ifp_flags; 1863 1864 rcu_read_lock(); 1865 1866 l3mdev = l3mdev_master_dev_rcu(dev); 1867 if (skip_dev_check) 1868 dev = NULL; 1869 1870 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1871 if (!net_eq(dev_net(ifp->idev->dev), net)) 1872 continue; 1873 1874 if (l3mdev_master_dev_rcu(ifp->idev->dev) != l3mdev) 1875 continue; 1876 1877 /* Decouple optimistic from tentative for evaluation here. 1878 * Ban optimistic addresses explicitly, when required. 1879 */ 1880 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1881 ? (ifp->flags&~IFA_F_TENTATIVE) 1882 : ifp->flags; 1883 if (ipv6_addr_equal(&ifp->addr, addr) && 1884 !(ifp_flags&banned_flags) && 1885 (!dev || ifp->idev->dev == dev || 1886 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1887 rcu_read_unlock(); 1888 return 1; 1889 } 1890 } 1891 1892 rcu_read_unlock(); 1893 return 0; 1894 } 1895 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1896 1897 1898 /* Compares an address/prefix_len with addresses on device @dev. 1899 * If one is found it returns true. 1900 */ 1901 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1902 const unsigned int prefix_len, struct net_device *dev) 1903 { 1904 const struct inet6_ifaddr *ifa; 1905 const struct inet6_dev *idev; 1906 bool ret = false; 1907 1908 rcu_read_lock(); 1909 idev = __in6_dev_get(dev); 1910 if (idev) { 1911 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1912 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1913 if (ret) 1914 break; 1915 } 1916 } 1917 rcu_read_unlock(); 1918 1919 return ret; 1920 } 1921 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1922 1923 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1924 { 1925 const struct inet6_ifaddr *ifa; 1926 const struct inet6_dev *idev; 1927 int onlink; 1928 1929 onlink = 0; 1930 rcu_read_lock(); 1931 idev = __in6_dev_get(dev); 1932 if (idev) { 1933 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1934 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1935 ifa->prefix_len); 1936 if (onlink) 1937 break; 1938 } 1939 } 1940 rcu_read_unlock(); 1941 return onlink; 1942 } 1943 EXPORT_SYMBOL(ipv6_chk_prefix); 1944 1945 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1946 struct net_device *dev, int strict) 1947 { 1948 unsigned int hash = inet6_addr_hash(net, addr); 1949 struct inet6_ifaddr *ifp, *result = NULL; 1950 1951 rcu_read_lock(); 1952 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1953 if (!net_eq(dev_net(ifp->idev->dev), net)) 1954 continue; 1955 if (ipv6_addr_equal(&ifp->addr, addr)) { 1956 if (!dev || ifp->idev->dev == dev || 1957 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1958 result = ifp; 1959 in6_ifa_hold(ifp); 1960 break; 1961 } 1962 } 1963 } 1964 rcu_read_unlock(); 1965 1966 return result; 1967 } 1968 1969 /* Gets referenced address, destroys ifaddr */ 1970 1971 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1972 { 1973 if (dad_failed) 1974 ifp->flags |= IFA_F_DADFAILED; 1975 1976 if (ifp->flags&IFA_F_TEMPORARY) { 1977 struct inet6_ifaddr *ifpub; 1978 spin_lock_bh(&ifp->lock); 1979 ifpub = ifp->ifpub; 1980 if (ifpub) { 1981 in6_ifa_hold(ifpub); 1982 spin_unlock_bh(&ifp->lock); 1983 ipv6_create_tempaddr(ifpub, ifp, true); 1984 in6_ifa_put(ifpub); 1985 } else { 1986 spin_unlock_bh(&ifp->lock); 1987 } 1988 ipv6_del_addr(ifp); 1989 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) { 1990 spin_lock_bh(&ifp->lock); 1991 addrconf_del_dad_work(ifp); 1992 ifp->flags |= IFA_F_TENTATIVE; 1993 if (dad_failed) 1994 ifp->flags &= ~IFA_F_OPTIMISTIC; 1995 spin_unlock_bh(&ifp->lock); 1996 if (dad_failed) 1997 ipv6_ifa_notify(0, ifp); 1998 in6_ifa_put(ifp); 1999 } else { 2000 ipv6_del_addr(ifp); 2001 } 2002 } 2003 2004 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 2005 { 2006 int err = -ENOENT; 2007 2008 spin_lock_bh(&ifp->lock); 2009 if (ifp->state == INET6_IFADDR_STATE_DAD) { 2010 ifp->state = INET6_IFADDR_STATE_POSTDAD; 2011 err = 0; 2012 } 2013 spin_unlock_bh(&ifp->lock); 2014 2015 return err; 2016 } 2017 2018 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp) 2019 { 2020 struct inet6_dev *idev = ifp->idev; 2021 struct net *net = dev_net(ifp->idev->dev); 2022 2023 if (addrconf_dad_end(ifp)) { 2024 in6_ifa_put(ifp); 2025 return; 2026 } 2027 2028 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n", 2029 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source); 2030 2031 spin_lock_bh(&ifp->lock); 2032 2033 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 2034 int scope = ifp->scope; 2035 u32 flags = ifp->flags; 2036 struct in6_addr new_addr; 2037 struct inet6_ifaddr *ifp2; 2038 u32 valid_lft, preferred_lft; 2039 int pfxlen = ifp->prefix_len; 2040 int retries = ifp->stable_privacy_retry + 1; 2041 2042 if (retries > net->ipv6.sysctl.idgen_retries) { 2043 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 2044 ifp->idev->dev->name); 2045 goto errdad; 2046 } 2047 2048 new_addr = ifp->addr; 2049 if (ipv6_generate_stable_address(&new_addr, retries, 2050 idev)) 2051 goto errdad; 2052 2053 valid_lft = ifp->valid_lft; 2054 preferred_lft = ifp->prefered_lft; 2055 2056 spin_unlock_bh(&ifp->lock); 2057 2058 if (idev->cnf.max_addresses && 2059 ipv6_count_addresses(idev) >= 2060 idev->cnf.max_addresses) 2061 goto lock_errdad; 2062 2063 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 2064 ifp->idev->dev->name); 2065 2066 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen, 2067 scope, flags, valid_lft, 2068 preferred_lft, false, NULL); 2069 if (IS_ERR(ifp2)) 2070 goto lock_errdad; 2071 2072 spin_lock_bh(&ifp2->lock); 2073 ifp2->stable_privacy_retry = retries; 2074 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2075 spin_unlock_bh(&ifp2->lock); 2076 2077 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2078 in6_ifa_put(ifp2); 2079 lock_errdad: 2080 spin_lock_bh(&ifp->lock); 2081 } 2082 2083 errdad: 2084 /* transition from _POSTDAD to _ERRDAD */ 2085 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2086 spin_unlock_bh(&ifp->lock); 2087 2088 addrconf_mod_dad_work(ifp, 0); 2089 in6_ifa_put(ifp); 2090 } 2091 2092 /* Join to solicited addr multicast group. 2093 * caller must hold RTNL */ 2094 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2095 { 2096 struct in6_addr maddr; 2097 2098 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2099 return; 2100 2101 addrconf_addr_solict_mult(addr, &maddr); 2102 ipv6_dev_mc_inc(dev, &maddr); 2103 } 2104 2105 /* caller must hold RTNL */ 2106 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2107 { 2108 struct in6_addr maddr; 2109 2110 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2111 return; 2112 2113 addrconf_addr_solict_mult(addr, &maddr); 2114 __ipv6_dev_mc_dec(idev, &maddr); 2115 } 2116 2117 /* caller must hold RTNL */ 2118 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2119 { 2120 struct in6_addr addr; 2121 2122 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2123 return; 2124 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2125 if (ipv6_addr_any(&addr)) 2126 return; 2127 __ipv6_dev_ac_inc(ifp->idev, &addr); 2128 } 2129 2130 /* caller must hold RTNL */ 2131 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2132 { 2133 struct in6_addr addr; 2134 2135 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2136 return; 2137 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2138 if (ipv6_addr_any(&addr)) 2139 return; 2140 __ipv6_dev_ac_dec(ifp->idev, &addr); 2141 } 2142 2143 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2144 { 2145 switch (dev->addr_len) { 2146 case ETH_ALEN: 2147 memcpy(eui, dev->dev_addr, 3); 2148 eui[3] = 0xFF; 2149 eui[4] = 0xFE; 2150 memcpy(eui + 5, dev->dev_addr + 3, 3); 2151 break; 2152 case EUI64_ADDR_LEN: 2153 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2154 eui[0] ^= 2; 2155 break; 2156 default: 2157 return -1; 2158 } 2159 2160 return 0; 2161 } 2162 2163 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2164 { 2165 union fwnet_hwaddr *ha; 2166 2167 if (dev->addr_len != FWNET_ALEN) 2168 return -1; 2169 2170 ha = (union fwnet_hwaddr *)dev->dev_addr; 2171 2172 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2173 eui[0] ^= 2; 2174 return 0; 2175 } 2176 2177 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2178 { 2179 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2180 if (dev->addr_len != ARCNET_ALEN) 2181 return -1; 2182 memset(eui, 0, 7); 2183 eui[7] = *(u8 *)dev->dev_addr; 2184 return 0; 2185 } 2186 2187 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2188 { 2189 if (dev->addr_len != INFINIBAND_ALEN) 2190 return -1; 2191 memcpy(eui, dev->dev_addr + 12, 8); 2192 eui[0] |= 2; 2193 return 0; 2194 } 2195 2196 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2197 { 2198 if (addr == 0) 2199 return -1; 2200 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2201 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2202 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2203 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2204 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2205 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2206 eui[1] = 0; 2207 eui[2] = 0x5E; 2208 eui[3] = 0xFE; 2209 memcpy(eui + 4, &addr, 4); 2210 return 0; 2211 } 2212 2213 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2214 { 2215 if (dev->priv_flags & IFF_ISATAP) 2216 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2217 return -1; 2218 } 2219 2220 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2221 { 2222 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2223 } 2224 2225 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2226 { 2227 memcpy(eui, dev->perm_addr, 3); 2228 memcpy(eui + 5, dev->perm_addr + 3, 3); 2229 eui[3] = 0xFF; 2230 eui[4] = 0xFE; 2231 eui[0] ^= 2; 2232 return 0; 2233 } 2234 2235 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2236 { 2237 switch (dev->type) { 2238 case ARPHRD_ETHER: 2239 case ARPHRD_FDDI: 2240 return addrconf_ifid_eui48(eui, dev); 2241 case ARPHRD_ARCNET: 2242 return addrconf_ifid_arcnet(eui, dev); 2243 case ARPHRD_INFINIBAND: 2244 return addrconf_ifid_infiniband(eui, dev); 2245 case ARPHRD_SIT: 2246 return addrconf_ifid_sit(eui, dev); 2247 case ARPHRD_IPGRE: 2248 case ARPHRD_TUNNEL: 2249 return addrconf_ifid_gre(eui, dev); 2250 case ARPHRD_6LOWPAN: 2251 return addrconf_ifid_6lowpan(eui, dev); 2252 case ARPHRD_IEEE1394: 2253 return addrconf_ifid_ieee1394(eui, dev); 2254 case ARPHRD_TUNNEL6: 2255 case ARPHRD_IP6GRE: 2256 return addrconf_ifid_ip6tnl(eui, dev); 2257 } 2258 return -1; 2259 } 2260 2261 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2262 { 2263 int err = -1; 2264 struct inet6_ifaddr *ifp; 2265 2266 read_lock_bh(&idev->lock); 2267 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2268 if (ifp->scope > IFA_LINK) 2269 break; 2270 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2271 memcpy(eui, ifp->addr.s6_addr+8, 8); 2272 err = 0; 2273 break; 2274 } 2275 } 2276 read_unlock_bh(&idev->lock); 2277 return err; 2278 } 2279 2280 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 2281 static void ipv6_regen_rndid(struct inet6_dev *idev) 2282 { 2283 regen: 2284 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 2285 idev->rndid[0] &= ~0x02; 2286 2287 /* 2288 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 2289 * check if generated address is not inappropriate 2290 * 2291 * - Reserved subnet anycast (RFC 2526) 2292 * 11111101 11....11 1xxxxxxx 2293 * - ISATAP (RFC4214) 6.1 2294 * 00-00-5E-FE-xx-xx-xx-xx 2295 * - value 0 2296 * - XXX: already assigned to an address on the device 2297 */ 2298 if (idev->rndid[0] == 0xfd && 2299 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 2300 (idev->rndid[7]&0x80)) 2301 goto regen; 2302 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 2303 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 2304 goto regen; 2305 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 2306 goto regen; 2307 } 2308 } 2309 2310 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 2311 { 2312 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 2313 ipv6_regen_rndid(idev); 2314 } 2315 2316 /* 2317 * Add prefix route. 2318 */ 2319 2320 static void 2321 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 2322 unsigned long expires, u32 flags, gfp_t gfp_flags) 2323 { 2324 struct fib6_config cfg = { 2325 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2326 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2327 .fc_ifindex = dev->ifindex, 2328 .fc_expires = expires, 2329 .fc_dst_len = plen, 2330 .fc_flags = RTF_UP | flags, 2331 .fc_nlinfo.nl_net = dev_net(dev), 2332 .fc_protocol = RTPROT_KERNEL, 2333 .fc_type = RTN_UNICAST, 2334 }; 2335 2336 cfg.fc_dst = *pfx; 2337 2338 /* Prevent useless cloning on PtP SIT. 2339 This thing is done here expecting that the whole 2340 class of non-broadcast devices need not cloning. 2341 */ 2342 #if IS_ENABLED(CONFIG_IPV6_SIT) 2343 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2344 cfg.fc_flags |= RTF_NONEXTHOP; 2345 #endif 2346 2347 ip6_route_add(&cfg, gfp_flags, NULL); 2348 } 2349 2350 2351 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2352 int plen, 2353 const struct net_device *dev, 2354 u32 flags, u32 noflags) 2355 { 2356 struct fib6_node *fn; 2357 struct fib6_info *rt = NULL; 2358 struct fib6_table *table; 2359 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2360 2361 table = fib6_get_table(dev_net(dev), tb_id); 2362 if (!table) 2363 return NULL; 2364 2365 rcu_read_lock(); 2366 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true); 2367 if (!fn) 2368 goto out; 2369 2370 for_each_fib6_node_rt_rcu(fn) { 2371 if (rt->fib6_nh.nh_dev->ifindex != dev->ifindex) 2372 continue; 2373 if ((rt->fib6_flags & flags) != flags) 2374 continue; 2375 if ((rt->fib6_flags & noflags) != 0) 2376 continue; 2377 fib6_info_hold(rt); 2378 break; 2379 } 2380 out: 2381 rcu_read_unlock(); 2382 return rt; 2383 } 2384 2385 2386 /* Create "default" multicast route to the interface */ 2387 2388 static void addrconf_add_mroute(struct net_device *dev) 2389 { 2390 struct fib6_config cfg = { 2391 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2392 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2393 .fc_ifindex = dev->ifindex, 2394 .fc_dst_len = 8, 2395 .fc_flags = RTF_UP, 2396 .fc_type = RTN_UNICAST, 2397 .fc_nlinfo.nl_net = dev_net(dev), 2398 }; 2399 2400 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2401 2402 ip6_route_add(&cfg, GFP_ATOMIC, NULL); 2403 } 2404 2405 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2406 { 2407 struct inet6_dev *idev; 2408 2409 ASSERT_RTNL(); 2410 2411 idev = ipv6_find_idev(dev); 2412 if (!idev) 2413 return ERR_PTR(-ENOBUFS); 2414 2415 if (idev->cnf.disable_ipv6) 2416 return ERR_PTR(-EACCES); 2417 2418 /* Add default multicast route */ 2419 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2420 addrconf_add_mroute(dev); 2421 2422 return idev; 2423 } 2424 2425 static void manage_tempaddrs(struct inet6_dev *idev, 2426 struct inet6_ifaddr *ifp, 2427 __u32 valid_lft, __u32 prefered_lft, 2428 bool create, unsigned long now) 2429 { 2430 u32 flags; 2431 struct inet6_ifaddr *ift; 2432 2433 read_lock_bh(&idev->lock); 2434 /* update all temporary addresses in the list */ 2435 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2436 int age, max_valid, max_prefered; 2437 2438 if (ifp != ift->ifpub) 2439 continue; 2440 2441 /* RFC 4941 section 3.3: 2442 * If a received option will extend the lifetime of a public 2443 * address, the lifetimes of temporary addresses should 2444 * be extended, subject to the overall constraint that no 2445 * temporary addresses should ever remain "valid" or "preferred" 2446 * for a time longer than (TEMP_VALID_LIFETIME) or 2447 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2448 */ 2449 age = (now - ift->cstamp) / HZ; 2450 max_valid = idev->cnf.temp_valid_lft - age; 2451 if (max_valid < 0) 2452 max_valid = 0; 2453 2454 max_prefered = idev->cnf.temp_prefered_lft - 2455 idev->desync_factor - age; 2456 if (max_prefered < 0) 2457 max_prefered = 0; 2458 2459 if (valid_lft > max_valid) 2460 valid_lft = max_valid; 2461 2462 if (prefered_lft > max_prefered) 2463 prefered_lft = max_prefered; 2464 2465 spin_lock(&ift->lock); 2466 flags = ift->flags; 2467 ift->valid_lft = valid_lft; 2468 ift->prefered_lft = prefered_lft; 2469 ift->tstamp = now; 2470 if (prefered_lft > 0) 2471 ift->flags &= ~IFA_F_DEPRECATED; 2472 2473 spin_unlock(&ift->lock); 2474 if (!(flags&IFA_F_TENTATIVE)) 2475 ipv6_ifa_notify(0, ift); 2476 } 2477 2478 if ((create || list_empty(&idev->tempaddr_list)) && 2479 idev->cnf.use_tempaddr > 0) { 2480 /* When a new public address is created as described 2481 * in [ADDRCONF], also create a new temporary address. 2482 * Also create a temporary address if it's enabled but 2483 * no temporary address currently exists. 2484 */ 2485 read_unlock_bh(&idev->lock); 2486 ipv6_create_tempaddr(ifp, NULL, false); 2487 } else { 2488 read_unlock_bh(&idev->lock); 2489 } 2490 } 2491 2492 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2493 { 2494 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2495 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2496 } 2497 2498 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2499 const struct prefix_info *pinfo, 2500 struct inet6_dev *in6_dev, 2501 const struct in6_addr *addr, int addr_type, 2502 u32 addr_flags, bool sllao, bool tokenized, 2503 __u32 valid_lft, u32 prefered_lft) 2504 { 2505 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2506 int create = 0, update_lft = 0; 2507 2508 if (!ifp && valid_lft) { 2509 int max_addresses = in6_dev->cnf.max_addresses; 2510 2511 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2512 if ((net->ipv6.devconf_all->optimistic_dad || 2513 in6_dev->cnf.optimistic_dad) && 2514 !net->ipv6.devconf_all->forwarding && sllao) 2515 addr_flags |= IFA_F_OPTIMISTIC; 2516 #endif 2517 2518 /* Do not allow to create too much of autoconfigured 2519 * addresses; this would be too easy way to crash kernel. 2520 */ 2521 if (!max_addresses || 2522 ipv6_count_addresses(in6_dev) < max_addresses) 2523 ifp = ipv6_add_addr(in6_dev, addr, NULL, 2524 pinfo->prefix_len, 2525 addr_type&IPV6_ADDR_SCOPE_MASK, 2526 addr_flags, valid_lft, 2527 prefered_lft, false, NULL); 2528 2529 if (IS_ERR_OR_NULL(ifp)) 2530 return -1; 2531 2532 create = 1; 2533 spin_lock_bh(&ifp->lock); 2534 ifp->flags |= IFA_F_MANAGETEMPADDR; 2535 ifp->cstamp = jiffies; 2536 ifp->tokenized = tokenized; 2537 spin_unlock_bh(&ifp->lock); 2538 addrconf_dad_start(ifp); 2539 } 2540 2541 if (ifp) { 2542 u32 flags; 2543 unsigned long now; 2544 u32 stored_lft; 2545 2546 /* update lifetime (RFC2462 5.5.3 e) */ 2547 spin_lock_bh(&ifp->lock); 2548 now = jiffies; 2549 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2550 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2551 else 2552 stored_lft = 0; 2553 if (!create && stored_lft) { 2554 const u32 minimum_lft = min_t(u32, 2555 stored_lft, MIN_VALID_LIFETIME); 2556 valid_lft = max(valid_lft, minimum_lft); 2557 2558 /* RFC4862 Section 5.5.3e: 2559 * "Note that the preferred lifetime of the 2560 * corresponding address is always reset to 2561 * the Preferred Lifetime in the received 2562 * Prefix Information option, regardless of 2563 * whether the valid lifetime is also reset or 2564 * ignored." 2565 * 2566 * So we should always update prefered_lft here. 2567 */ 2568 update_lft = 1; 2569 } 2570 2571 if (update_lft) { 2572 ifp->valid_lft = valid_lft; 2573 ifp->prefered_lft = prefered_lft; 2574 ifp->tstamp = now; 2575 flags = ifp->flags; 2576 ifp->flags &= ~IFA_F_DEPRECATED; 2577 spin_unlock_bh(&ifp->lock); 2578 2579 if (!(flags&IFA_F_TENTATIVE)) 2580 ipv6_ifa_notify(0, ifp); 2581 } else 2582 spin_unlock_bh(&ifp->lock); 2583 2584 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2585 create, now); 2586 2587 in6_ifa_put(ifp); 2588 addrconf_verify(); 2589 } 2590 2591 return 0; 2592 } 2593 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2594 2595 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2596 { 2597 struct prefix_info *pinfo; 2598 __u32 valid_lft; 2599 __u32 prefered_lft; 2600 int addr_type, err; 2601 u32 addr_flags = 0; 2602 struct inet6_dev *in6_dev; 2603 struct net *net = dev_net(dev); 2604 2605 pinfo = (struct prefix_info *) opt; 2606 2607 if (len < sizeof(struct prefix_info)) { 2608 netdev_dbg(dev, "addrconf: prefix option too short\n"); 2609 return; 2610 } 2611 2612 /* 2613 * Validation checks ([ADDRCONF], page 19) 2614 */ 2615 2616 addr_type = ipv6_addr_type(&pinfo->prefix); 2617 2618 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2619 return; 2620 2621 valid_lft = ntohl(pinfo->valid); 2622 prefered_lft = ntohl(pinfo->prefered); 2623 2624 if (prefered_lft > valid_lft) { 2625 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2626 return; 2627 } 2628 2629 in6_dev = in6_dev_get(dev); 2630 2631 if (!in6_dev) { 2632 net_dbg_ratelimited("addrconf: device %s not configured\n", 2633 dev->name); 2634 return; 2635 } 2636 2637 /* 2638 * Two things going on here: 2639 * 1) Add routes for on-link prefixes 2640 * 2) Configure prefixes with the auto flag set 2641 */ 2642 2643 if (pinfo->onlink) { 2644 struct fib6_info *rt; 2645 unsigned long rt_expires; 2646 2647 /* Avoid arithmetic overflow. Really, we could 2648 * save rt_expires in seconds, likely valid_lft, 2649 * but it would require division in fib gc, that it 2650 * not good. 2651 */ 2652 if (HZ > USER_HZ) 2653 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2654 else 2655 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2656 2657 if (addrconf_finite_timeout(rt_expires)) 2658 rt_expires *= HZ; 2659 2660 rt = addrconf_get_prefix_route(&pinfo->prefix, 2661 pinfo->prefix_len, 2662 dev, 2663 RTF_ADDRCONF | RTF_PREFIX_RT, 2664 RTF_GATEWAY | RTF_DEFAULT); 2665 2666 if (rt) { 2667 /* Autoconf prefix route */ 2668 if (valid_lft == 0) { 2669 ip6_del_rt(net, rt); 2670 rt = NULL; 2671 } else if (addrconf_finite_timeout(rt_expires)) { 2672 /* not infinity */ 2673 fib6_set_expires(rt, jiffies + rt_expires); 2674 } else { 2675 fib6_clean_expires(rt); 2676 } 2677 } else if (valid_lft) { 2678 clock_t expires = 0; 2679 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2680 if (addrconf_finite_timeout(rt_expires)) { 2681 /* not infinity */ 2682 flags |= RTF_EXPIRES; 2683 expires = jiffies_to_clock_t(rt_expires); 2684 } 2685 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2686 dev, expires, flags, GFP_ATOMIC); 2687 } 2688 fib6_info_release(rt); 2689 } 2690 2691 /* Try to figure out our local address for this prefix */ 2692 2693 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2694 struct in6_addr addr; 2695 bool tokenized = false, dev_addr_generated = false; 2696 2697 if (pinfo->prefix_len == 64) { 2698 memcpy(&addr, &pinfo->prefix, 8); 2699 2700 if (!ipv6_addr_any(&in6_dev->token)) { 2701 read_lock_bh(&in6_dev->lock); 2702 memcpy(addr.s6_addr + 8, 2703 in6_dev->token.s6_addr + 8, 8); 2704 read_unlock_bh(&in6_dev->lock); 2705 tokenized = true; 2706 } else if (is_addr_mode_generate_stable(in6_dev) && 2707 !ipv6_generate_stable_address(&addr, 0, 2708 in6_dev)) { 2709 addr_flags |= IFA_F_STABLE_PRIVACY; 2710 goto ok; 2711 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2712 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2713 goto put; 2714 } else { 2715 dev_addr_generated = true; 2716 } 2717 goto ok; 2718 } 2719 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2720 pinfo->prefix_len); 2721 goto put; 2722 2723 ok: 2724 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2725 &addr, addr_type, 2726 addr_flags, sllao, 2727 tokenized, valid_lft, 2728 prefered_lft); 2729 if (err) 2730 goto put; 2731 2732 /* Ignore error case here because previous prefix add addr was 2733 * successful which will be notified. 2734 */ 2735 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2736 addr_type, addr_flags, sllao, 2737 tokenized, valid_lft, 2738 prefered_lft, 2739 dev_addr_generated); 2740 } 2741 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2742 put: 2743 in6_dev_put(in6_dev); 2744 } 2745 2746 /* 2747 * Set destination address. 2748 * Special case for SIT interfaces where we create a new "virtual" 2749 * device. 2750 */ 2751 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2752 { 2753 struct in6_ifreq ireq; 2754 struct net_device *dev; 2755 int err = -EINVAL; 2756 2757 rtnl_lock(); 2758 2759 err = -EFAULT; 2760 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2761 goto err_exit; 2762 2763 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2764 2765 err = -ENODEV; 2766 if (!dev) 2767 goto err_exit; 2768 2769 #if IS_ENABLED(CONFIG_IPV6_SIT) 2770 if (dev->type == ARPHRD_SIT) { 2771 const struct net_device_ops *ops = dev->netdev_ops; 2772 struct ifreq ifr; 2773 struct ip_tunnel_parm p; 2774 2775 err = -EADDRNOTAVAIL; 2776 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2777 goto err_exit; 2778 2779 memset(&p, 0, sizeof(p)); 2780 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2781 p.iph.saddr = 0; 2782 p.iph.version = 4; 2783 p.iph.ihl = 5; 2784 p.iph.protocol = IPPROTO_IPV6; 2785 p.iph.ttl = 64; 2786 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2787 2788 if (ops->ndo_do_ioctl) { 2789 mm_segment_t oldfs = get_fs(); 2790 2791 set_fs(KERNEL_DS); 2792 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2793 set_fs(oldfs); 2794 } else 2795 err = -EOPNOTSUPP; 2796 2797 if (err == 0) { 2798 err = -ENOBUFS; 2799 dev = __dev_get_by_name(net, p.name); 2800 if (!dev) 2801 goto err_exit; 2802 err = dev_open(dev); 2803 } 2804 } 2805 #endif 2806 2807 err_exit: 2808 rtnl_unlock(); 2809 return err; 2810 } 2811 2812 static int ipv6_mc_config(struct sock *sk, bool join, 2813 const struct in6_addr *addr, int ifindex) 2814 { 2815 int ret; 2816 2817 ASSERT_RTNL(); 2818 2819 lock_sock(sk); 2820 if (join) 2821 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2822 else 2823 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2824 release_sock(sk); 2825 2826 return ret; 2827 } 2828 2829 /* 2830 * Manual configuration of address on an interface 2831 */ 2832 static int inet6_addr_add(struct net *net, int ifindex, 2833 const struct in6_addr *pfx, 2834 const struct in6_addr *peer_pfx, 2835 unsigned int plen, __u32 ifa_flags, 2836 __u32 prefered_lft, __u32 valid_lft, 2837 struct netlink_ext_ack *extack) 2838 { 2839 struct inet6_ifaddr *ifp; 2840 struct inet6_dev *idev; 2841 struct net_device *dev; 2842 unsigned long timeout; 2843 clock_t expires; 2844 int scope; 2845 u32 flags; 2846 2847 ASSERT_RTNL(); 2848 2849 if (plen > 128) 2850 return -EINVAL; 2851 2852 /* check the lifetime */ 2853 if (!valid_lft || prefered_lft > valid_lft) 2854 return -EINVAL; 2855 2856 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64) 2857 return -EINVAL; 2858 2859 dev = __dev_get_by_index(net, ifindex); 2860 if (!dev) 2861 return -ENODEV; 2862 2863 idev = addrconf_add_dev(dev); 2864 if (IS_ERR(idev)) 2865 return PTR_ERR(idev); 2866 2867 if (ifa_flags & IFA_F_MCAUTOJOIN) { 2868 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2869 true, pfx, ifindex); 2870 2871 if (ret < 0) 2872 return ret; 2873 } 2874 2875 scope = ipv6_addr_scope(pfx); 2876 2877 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2878 if (addrconf_finite_timeout(timeout)) { 2879 expires = jiffies_to_clock_t(timeout * HZ); 2880 valid_lft = timeout; 2881 flags = RTF_EXPIRES; 2882 } else { 2883 expires = 0; 2884 flags = 0; 2885 ifa_flags |= IFA_F_PERMANENT; 2886 } 2887 2888 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2889 if (addrconf_finite_timeout(timeout)) { 2890 if (timeout == 0) 2891 ifa_flags |= IFA_F_DEPRECATED; 2892 prefered_lft = timeout; 2893 } 2894 2895 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags, 2896 valid_lft, prefered_lft, true, extack); 2897 2898 if (!IS_ERR(ifp)) { 2899 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 2900 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2901 expires, flags, GFP_KERNEL); 2902 } 2903 2904 /* Send a netlink notification if DAD is enabled and 2905 * optimistic flag is not set 2906 */ 2907 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD))) 2908 ipv6_ifa_notify(0, ifp); 2909 /* 2910 * Note that section 3.1 of RFC 4429 indicates 2911 * that the Optimistic flag should not be set for 2912 * manually configured addresses 2913 */ 2914 addrconf_dad_start(ifp); 2915 if (ifa_flags & IFA_F_MANAGETEMPADDR) 2916 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft, 2917 true, jiffies); 2918 in6_ifa_put(ifp); 2919 addrconf_verify_rtnl(); 2920 return 0; 2921 } else if (ifa_flags & IFA_F_MCAUTOJOIN) { 2922 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2923 false, pfx, ifindex); 2924 } 2925 2926 return PTR_ERR(ifp); 2927 } 2928 2929 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2930 const struct in6_addr *pfx, unsigned int plen) 2931 { 2932 struct inet6_ifaddr *ifp; 2933 struct inet6_dev *idev; 2934 struct net_device *dev; 2935 2936 if (plen > 128) 2937 return -EINVAL; 2938 2939 dev = __dev_get_by_index(net, ifindex); 2940 if (!dev) 2941 return -ENODEV; 2942 2943 idev = __in6_dev_get(dev); 2944 if (!idev) 2945 return -ENXIO; 2946 2947 read_lock_bh(&idev->lock); 2948 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2949 if (ifp->prefix_len == plen && 2950 ipv6_addr_equal(pfx, &ifp->addr)) { 2951 in6_ifa_hold(ifp); 2952 read_unlock_bh(&idev->lock); 2953 2954 if (!(ifp->flags & IFA_F_TEMPORARY) && 2955 (ifa_flags & IFA_F_MANAGETEMPADDR)) 2956 manage_tempaddrs(idev, ifp, 0, 0, false, 2957 jiffies); 2958 ipv6_del_addr(ifp); 2959 addrconf_verify_rtnl(); 2960 if (ipv6_addr_is_multicast(pfx)) { 2961 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2962 false, pfx, dev->ifindex); 2963 } 2964 return 0; 2965 } 2966 } 2967 read_unlock_bh(&idev->lock); 2968 return -EADDRNOTAVAIL; 2969 } 2970 2971 2972 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2973 { 2974 struct in6_ifreq ireq; 2975 int err; 2976 2977 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2978 return -EPERM; 2979 2980 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2981 return -EFAULT; 2982 2983 rtnl_lock(); 2984 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL, 2985 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2986 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME, NULL); 2987 rtnl_unlock(); 2988 return err; 2989 } 2990 2991 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2992 { 2993 struct in6_ifreq ireq; 2994 int err; 2995 2996 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2997 return -EPERM; 2998 2999 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3000 return -EFAULT; 3001 3002 rtnl_lock(); 3003 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 3004 ireq.ifr6_prefixlen); 3005 rtnl_unlock(); 3006 return err; 3007 } 3008 3009 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 3010 int plen, int scope) 3011 { 3012 struct inet6_ifaddr *ifp; 3013 3014 ifp = ipv6_add_addr(idev, addr, NULL, plen, 3015 scope, IFA_F_PERMANENT, 3016 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME, 3017 true, NULL); 3018 if (!IS_ERR(ifp)) { 3019 spin_lock_bh(&ifp->lock); 3020 ifp->flags &= ~IFA_F_TENTATIVE; 3021 spin_unlock_bh(&ifp->lock); 3022 rt_genid_bump_ipv6(dev_net(idev->dev)); 3023 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3024 in6_ifa_put(ifp); 3025 } 3026 } 3027 3028 #if IS_ENABLED(CONFIG_IPV6_SIT) 3029 static void sit_add_v4_addrs(struct inet6_dev *idev) 3030 { 3031 struct in6_addr addr; 3032 struct net_device *dev; 3033 struct net *net = dev_net(idev->dev); 3034 int scope, plen; 3035 u32 pflags = 0; 3036 3037 ASSERT_RTNL(); 3038 3039 memset(&addr, 0, sizeof(struct in6_addr)); 3040 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 3041 3042 if (idev->dev->flags&IFF_POINTOPOINT) { 3043 addr.s6_addr32[0] = htonl(0xfe800000); 3044 scope = IFA_LINK; 3045 plen = 64; 3046 } else { 3047 scope = IPV6_ADDR_COMPATv4; 3048 plen = 96; 3049 pflags |= RTF_NONEXTHOP; 3050 } 3051 3052 if (addr.s6_addr32[3]) { 3053 add_addr(idev, &addr, plen, scope); 3054 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags, 3055 GFP_ATOMIC); 3056 return; 3057 } 3058 3059 for_each_netdev(net, dev) { 3060 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3061 if (in_dev && (dev->flags & IFF_UP)) { 3062 struct in_ifaddr *ifa; 3063 3064 int flag = scope; 3065 3066 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 3067 3068 addr.s6_addr32[3] = ifa->ifa_local; 3069 3070 if (ifa->ifa_scope == RT_SCOPE_LINK) 3071 continue; 3072 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3073 if (idev->dev->flags&IFF_POINTOPOINT) 3074 continue; 3075 flag |= IFA_HOST; 3076 } 3077 3078 add_addr(idev, &addr, plen, flag); 3079 addrconf_prefix_route(&addr, plen, idev->dev, 0, 3080 pflags, GFP_ATOMIC); 3081 } 3082 } 3083 } 3084 } 3085 #endif 3086 3087 static void init_loopback(struct net_device *dev) 3088 { 3089 struct inet6_dev *idev; 3090 3091 /* ::1 */ 3092 3093 ASSERT_RTNL(); 3094 3095 idev = ipv6_find_idev(dev); 3096 if (!idev) { 3097 pr_debug("%s: add_dev failed\n", __func__); 3098 return; 3099 } 3100 3101 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 3102 } 3103 3104 void addrconf_add_linklocal(struct inet6_dev *idev, 3105 const struct in6_addr *addr, u32 flags) 3106 { 3107 struct inet6_ifaddr *ifp; 3108 u32 addr_flags = flags | IFA_F_PERMANENT; 3109 3110 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3111 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad || 3112 idev->cnf.optimistic_dad) && 3113 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3114 addr_flags |= IFA_F_OPTIMISTIC; 3115 #endif 3116 3117 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 3118 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME, true, NULL); 3119 if (!IS_ERR(ifp)) { 3120 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 3121 0, 0, GFP_ATOMIC); 3122 addrconf_dad_start(ifp); 3123 in6_ifa_put(ifp); 3124 } 3125 } 3126 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3127 3128 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3129 { 3130 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3131 return true; 3132 3133 if (address.s6_addr32[2] == htonl(0x02005eff) && 3134 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3135 return true; 3136 3137 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3138 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3139 return true; 3140 3141 return false; 3142 } 3143 3144 static int ipv6_generate_stable_address(struct in6_addr *address, 3145 u8 dad_count, 3146 const struct inet6_dev *idev) 3147 { 3148 static DEFINE_SPINLOCK(lock); 3149 static __u32 digest[SHA_DIGEST_WORDS]; 3150 static __u32 workspace[SHA_WORKSPACE_WORDS]; 3151 3152 static union { 3153 char __data[SHA_MESSAGE_BYTES]; 3154 struct { 3155 struct in6_addr secret; 3156 __be32 prefix[2]; 3157 unsigned char hwaddr[MAX_ADDR_LEN]; 3158 u8 dad_count; 3159 } __packed; 3160 } data; 3161 3162 struct in6_addr secret; 3163 struct in6_addr temp; 3164 struct net *net = dev_net(idev->dev); 3165 3166 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3167 3168 if (idev->cnf.stable_secret.initialized) 3169 secret = idev->cnf.stable_secret.secret; 3170 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3171 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3172 else 3173 return -1; 3174 3175 retry: 3176 spin_lock_bh(&lock); 3177 3178 sha_init(digest); 3179 memset(&data, 0, sizeof(data)); 3180 memset(workspace, 0, sizeof(workspace)); 3181 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3182 data.prefix[0] = address->s6_addr32[0]; 3183 data.prefix[1] = address->s6_addr32[1]; 3184 data.secret = secret; 3185 data.dad_count = dad_count; 3186 3187 sha_transform(digest, data.__data, workspace); 3188 3189 temp = *address; 3190 temp.s6_addr32[2] = (__force __be32)digest[0]; 3191 temp.s6_addr32[3] = (__force __be32)digest[1]; 3192 3193 spin_unlock_bh(&lock); 3194 3195 if (ipv6_reserved_interfaceid(temp)) { 3196 dad_count++; 3197 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3198 return -1; 3199 goto retry; 3200 } 3201 3202 *address = temp; 3203 return 0; 3204 } 3205 3206 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3207 { 3208 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3209 3210 if (s->initialized) 3211 return; 3212 s = &idev->cnf.stable_secret; 3213 get_random_bytes(&s->secret, sizeof(s->secret)); 3214 s->initialized = true; 3215 } 3216 3217 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3218 { 3219 struct in6_addr addr; 3220 3221 /* no link local addresses on L3 master devices */ 3222 if (netif_is_l3_master(idev->dev)) 3223 return; 3224 3225 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3226 3227 switch (idev->cnf.addr_gen_mode) { 3228 case IN6_ADDR_GEN_MODE_RANDOM: 3229 ipv6_gen_mode_random_init(idev); 3230 /* fallthrough */ 3231 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3232 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3233 addrconf_add_linklocal(idev, &addr, 3234 IFA_F_STABLE_PRIVACY); 3235 else if (prefix_route) 3236 addrconf_prefix_route(&addr, 64, idev->dev, 3237 0, 0, GFP_KERNEL); 3238 break; 3239 case IN6_ADDR_GEN_MODE_EUI64: 3240 /* addrconf_add_linklocal also adds a prefix_route and we 3241 * only need to care about prefix routes if ipv6_generate_eui64 3242 * couldn't generate one. 3243 */ 3244 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3245 addrconf_add_linklocal(idev, &addr, 0); 3246 else if (prefix_route) 3247 addrconf_prefix_route(&addr, 64, idev->dev, 3248 0, 0, GFP_KERNEL); 3249 break; 3250 case IN6_ADDR_GEN_MODE_NONE: 3251 default: 3252 /* will not add any link local address */ 3253 break; 3254 } 3255 } 3256 3257 static void addrconf_dev_config(struct net_device *dev) 3258 { 3259 struct inet6_dev *idev; 3260 3261 ASSERT_RTNL(); 3262 3263 if ((dev->type != ARPHRD_ETHER) && 3264 (dev->type != ARPHRD_FDDI) && 3265 (dev->type != ARPHRD_ARCNET) && 3266 (dev->type != ARPHRD_INFINIBAND) && 3267 (dev->type != ARPHRD_IEEE1394) && 3268 (dev->type != ARPHRD_TUNNEL6) && 3269 (dev->type != ARPHRD_6LOWPAN) && 3270 (dev->type != ARPHRD_IP6GRE) && 3271 (dev->type != ARPHRD_IPGRE) && 3272 (dev->type != ARPHRD_TUNNEL) && 3273 (dev->type != ARPHRD_NONE)) { 3274 /* Alas, we support only Ethernet autoconfiguration. */ 3275 return; 3276 } 3277 3278 idev = addrconf_add_dev(dev); 3279 if (IS_ERR(idev)) 3280 return; 3281 3282 /* this device type has no EUI support */ 3283 if (dev->type == ARPHRD_NONE && 3284 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3285 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3286 3287 addrconf_addr_gen(idev, false); 3288 } 3289 3290 #if IS_ENABLED(CONFIG_IPV6_SIT) 3291 static void addrconf_sit_config(struct net_device *dev) 3292 { 3293 struct inet6_dev *idev; 3294 3295 ASSERT_RTNL(); 3296 3297 /* 3298 * Configure the tunnel with one of our IPv4 3299 * addresses... we should configure all of 3300 * our v4 addrs in the tunnel 3301 */ 3302 3303 idev = ipv6_find_idev(dev); 3304 if (!idev) { 3305 pr_debug("%s: add_dev failed\n", __func__); 3306 return; 3307 } 3308 3309 if (dev->priv_flags & IFF_ISATAP) { 3310 addrconf_addr_gen(idev, false); 3311 return; 3312 } 3313 3314 sit_add_v4_addrs(idev); 3315 3316 if (dev->flags&IFF_POINTOPOINT) 3317 addrconf_add_mroute(dev); 3318 } 3319 #endif 3320 3321 #if IS_ENABLED(CONFIG_NET_IPGRE) 3322 static void addrconf_gre_config(struct net_device *dev) 3323 { 3324 struct inet6_dev *idev; 3325 3326 ASSERT_RTNL(); 3327 3328 idev = ipv6_find_idev(dev); 3329 if (!idev) { 3330 pr_debug("%s: add_dev failed\n", __func__); 3331 return; 3332 } 3333 3334 addrconf_addr_gen(idev, true); 3335 if (dev->flags & IFF_POINTOPOINT) 3336 addrconf_add_mroute(dev); 3337 } 3338 #endif 3339 3340 static int fixup_permanent_addr(struct net *net, 3341 struct inet6_dev *idev, 3342 struct inet6_ifaddr *ifp) 3343 { 3344 /* !fib6_node means the host route was removed from the 3345 * FIB, for example, if 'lo' device is taken down. In that 3346 * case regenerate the host route. 3347 */ 3348 if (!ifp->rt || !ifp->rt->fib6_node) { 3349 struct fib6_info *f6i, *prev; 3350 3351 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false, 3352 GFP_ATOMIC); 3353 if (IS_ERR(f6i)) 3354 return PTR_ERR(f6i); 3355 3356 /* ifp->rt can be accessed outside of rtnl */ 3357 spin_lock(&ifp->lock); 3358 prev = ifp->rt; 3359 ifp->rt = f6i; 3360 spin_unlock(&ifp->lock); 3361 3362 fib6_info_release(prev); 3363 } 3364 3365 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3366 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3367 idev->dev, 0, 0, GFP_ATOMIC); 3368 } 3369 3370 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3371 addrconf_dad_start(ifp); 3372 3373 return 0; 3374 } 3375 3376 static void addrconf_permanent_addr(struct net *net, struct net_device *dev) 3377 { 3378 struct inet6_ifaddr *ifp, *tmp; 3379 struct inet6_dev *idev; 3380 3381 idev = __in6_dev_get(dev); 3382 if (!idev) 3383 return; 3384 3385 write_lock_bh(&idev->lock); 3386 3387 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3388 if ((ifp->flags & IFA_F_PERMANENT) && 3389 fixup_permanent_addr(net, idev, ifp) < 0) { 3390 write_unlock_bh(&idev->lock); 3391 in6_ifa_hold(ifp); 3392 ipv6_del_addr(ifp); 3393 write_lock_bh(&idev->lock); 3394 3395 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3396 idev->dev->name, &ifp->addr); 3397 } 3398 } 3399 3400 write_unlock_bh(&idev->lock); 3401 } 3402 3403 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3404 void *ptr) 3405 { 3406 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3407 struct netdev_notifier_changeupper_info *info; 3408 struct inet6_dev *idev = __in6_dev_get(dev); 3409 struct net *net = dev_net(dev); 3410 int run_pending = 0; 3411 int err; 3412 3413 switch (event) { 3414 case NETDEV_REGISTER: 3415 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3416 idev = ipv6_add_dev(dev); 3417 if (IS_ERR(idev)) 3418 return notifier_from_errno(PTR_ERR(idev)); 3419 } 3420 break; 3421 3422 case NETDEV_CHANGEMTU: 3423 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3424 if (dev->mtu < IPV6_MIN_MTU) { 3425 addrconf_ifdown(dev, dev != net->loopback_dev); 3426 break; 3427 } 3428 3429 if (idev) { 3430 rt6_mtu_change(dev, dev->mtu); 3431 idev->cnf.mtu6 = dev->mtu; 3432 break; 3433 } 3434 3435 /* allocate new idev */ 3436 idev = ipv6_add_dev(dev); 3437 if (IS_ERR(idev)) 3438 break; 3439 3440 /* device is still not ready */ 3441 if (!(idev->if_flags & IF_READY)) 3442 break; 3443 3444 run_pending = 1; 3445 3446 /* fall through */ 3447 3448 case NETDEV_UP: 3449 case NETDEV_CHANGE: 3450 if (dev->flags & IFF_SLAVE) 3451 break; 3452 3453 if (idev && idev->cnf.disable_ipv6) 3454 break; 3455 3456 if (event == NETDEV_UP) { 3457 /* restore routes for permanent addresses */ 3458 addrconf_permanent_addr(net, dev); 3459 3460 if (!addrconf_link_ready(dev)) { 3461 /* device is not ready yet. */ 3462 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3463 dev->name); 3464 break; 3465 } 3466 3467 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3468 idev = ipv6_add_dev(dev); 3469 3470 if (!IS_ERR_OR_NULL(idev)) { 3471 idev->if_flags |= IF_READY; 3472 run_pending = 1; 3473 } 3474 } else if (event == NETDEV_CHANGE) { 3475 if (!addrconf_link_ready(dev)) { 3476 /* device is still not ready. */ 3477 rt6_sync_down_dev(dev, event); 3478 break; 3479 } 3480 3481 if (idev) { 3482 if (idev->if_flags & IF_READY) { 3483 /* device is already configured - 3484 * but resend MLD reports, we might 3485 * have roamed and need to update 3486 * multicast snooping switches 3487 */ 3488 ipv6_mc_up(idev); 3489 rt6_sync_up(dev, RTNH_F_LINKDOWN); 3490 break; 3491 } 3492 idev->if_flags |= IF_READY; 3493 } 3494 3495 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3496 dev->name); 3497 3498 run_pending = 1; 3499 } 3500 3501 switch (dev->type) { 3502 #if IS_ENABLED(CONFIG_IPV6_SIT) 3503 case ARPHRD_SIT: 3504 addrconf_sit_config(dev); 3505 break; 3506 #endif 3507 #if IS_ENABLED(CONFIG_NET_IPGRE) 3508 case ARPHRD_IPGRE: 3509 addrconf_gre_config(dev); 3510 break; 3511 #endif 3512 case ARPHRD_LOOPBACK: 3513 init_loopback(dev); 3514 break; 3515 3516 default: 3517 addrconf_dev_config(dev); 3518 break; 3519 } 3520 3521 if (!IS_ERR_OR_NULL(idev)) { 3522 if (run_pending) 3523 addrconf_dad_run(idev); 3524 3525 /* Device has an address by now */ 3526 rt6_sync_up(dev, RTNH_F_DEAD); 3527 3528 /* 3529 * If the MTU changed during the interface down, 3530 * when the interface up, the changed MTU must be 3531 * reflected in the idev as well as routers. 3532 */ 3533 if (idev->cnf.mtu6 != dev->mtu && 3534 dev->mtu >= IPV6_MIN_MTU) { 3535 rt6_mtu_change(dev, dev->mtu); 3536 idev->cnf.mtu6 = dev->mtu; 3537 } 3538 idev->tstamp = jiffies; 3539 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3540 3541 /* 3542 * If the changed mtu during down is lower than 3543 * IPV6_MIN_MTU stop IPv6 on this interface. 3544 */ 3545 if (dev->mtu < IPV6_MIN_MTU) 3546 addrconf_ifdown(dev, dev != net->loopback_dev); 3547 } 3548 break; 3549 3550 case NETDEV_DOWN: 3551 case NETDEV_UNREGISTER: 3552 /* 3553 * Remove all addresses from this interface. 3554 */ 3555 addrconf_ifdown(dev, event != NETDEV_DOWN); 3556 break; 3557 3558 case NETDEV_CHANGENAME: 3559 if (idev) { 3560 snmp6_unregister_dev(idev); 3561 addrconf_sysctl_unregister(idev); 3562 err = addrconf_sysctl_register(idev); 3563 if (err) 3564 return notifier_from_errno(err); 3565 err = snmp6_register_dev(idev); 3566 if (err) { 3567 addrconf_sysctl_unregister(idev); 3568 return notifier_from_errno(err); 3569 } 3570 } 3571 break; 3572 3573 case NETDEV_PRE_TYPE_CHANGE: 3574 case NETDEV_POST_TYPE_CHANGE: 3575 if (idev) 3576 addrconf_type_change(dev, event); 3577 break; 3578 3579 case NETDEV_CHANGEUPPER: 3580 info = ptr; 3581 3582 /* flush all routes if dev is linked to or unlinked from 3583 * an L3 master device (e.g., VRF) 3584 */ 3585 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3586 addrconf_ifdown(dev, 0); 3587 } 3588 3589 return NOTIFY_OK; 3590 } 3591 3592 /* 3593 * addrconf module should be notified of a device going up 3594 */ 3595 static struct notifier_block ipv6_dev_notf = { 3596 .notifier_call = addrconf_notify, 3597 .priority = ADDRCONF_NOTIFY_PRIORITY, 3598 }; 3599 3600 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3601 { 3602 struct inet6_dev *idev; 3603 ASSERT_RTNL(); 3604 3605 idev = __in6_dev_get(dev); 3606 3607 if (event == NETDEV_POST_TYPE_CHANGE) 3608 ipv6_mc_remap(idev); 3609 else if (event == NETDEV_PRE_TYPE_CHANGE) 3610 ipv6_mc_unmap(idev); 3611 } 3612 3613 static bool addr_is_local(const struct in6_addr *addr) 3614 { 3615 return ipv6_addr_type(addr) & 3616 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3617 } 3618 3619 static int addrconf_ifdown(struct net_device *dev, int how) 3620 { 3621 unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN; 3622 struct net *net = dev_net(dev); 3623 struct inet6_dev *idev; 3624 struct inet6_ifaddr *ifa, *tmp; 3625 bool keep_addr = false; 3626 int state, i; 3627 3628 ASSERT_RTNL(); 3629 3630 rt6_disable_ip(dev, event); 3631 3632 idev = __in6_dev_get(dev); 3633 if (!idev) 3634 return -ENODEV; 3635 3636 /* 3637 * Step 1: remove reference to ipv6 device from parent device. 3638 * Do not dev_put! 3639 */ 3640 if (how) { 3641 idev->dead = 1; 3642 3643 /* protected by rtnl_lock */ 3644 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3645 3646 /* Step 1.5: remove snmp6 entry */ 3647 snmp6_unregister_dev(idev); 3648 3649 } 3650 3651 /* combine the user config with event to determine if permanent 3652 * addresses are to be removed from address hash table 3653 */ 3654 if (!how && !idev->cnf.disable_ipv6) { 3655 /* aggregate the system setting and interface setting */ 3656 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3657 3658 if (!_keep_addr) 3659 _keep_addr = idev->cnf.keep_addr_on_down; 3660 3661 keep_addr = (_keep_addr > 0); 3662 } 3663 3664 /* Step 2: clear hash table */ 3665 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3666 struct hlist_head *h = &inet6_addr_lst[i]; 3667 3668 spin_lock_bh(&addrconf_hash_lock); 3669 restart: 3670 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3671 if (ifa->idev == idev) { 3672 addrconf_del_dad_work(ifa); 3673 /* combined flag + permanent flag decide if 3674 * address is retained on a down event 3675 */ 3676 if (!keep_addr || 3677 !(ifa->flags & IFA_F_PERMANENT) || 3678 addr_is_local(&ifa->addr)) { 3679 hlist_del_init_rcu(&ifa->addr_lst); 3680 goto restart; 3681 } 3682 } 3683 } 3684 spin_unlock_bh(&addrconf_hash_lock); 3685 } 3686 3687 write_lock_bh(&idev->lock); 3688 3689 addrconf_del_rs_timer(idev); 3690 3691 /* Step 2: clear flags for stateless addrconf */ 3692 if (!how) 3693 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3694 3695 /* Step 3: clear tempaddr list */ 3696 while (!list_empty(&idev->tempaddr_list)) { 3697 ifa = list_first_entry(&idev->tempaddr_list, 3698 struct inet6_ifaddr, tmp_list); 3699 list_del(&ifa->tmp_list); 3700 write_unlock_bh(&idev->lock); 3701 spin_lock_bh(&ifa->lock); 3702 3703 if (ifa->ifpub) { 3704 in6_ifa_put(ifa->ifpub); 3705 ifa->ifpub = NULL; 3706 } 3707 spin_unlock_bh(&ifa->lock); 3708 in6_ifa_put(ifa); 3709 write_lock_bh(&idev->lock); 3710 } 3711 3712 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3713 struct fib6_info *rt = NULL; 3714 bool keep; 3715 3716 addrconf_del_dad_work(ifa); 3717 3718 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3719 !addr_is_local(&ifa->addr); 3720 3721 write_unlock_bh(&idev->lock); 3722 spin_lock_bh(&ifa->lock); 3723 3724 if (keep) { 3725 /* set state to skip the notifier below */ 3726 state = INET6_IFADDR_STATE_DEAD; 3727 ifa->state = INET6_IFADDR_STATE_PREDAD; 3728 if (!(ifa->flags & IFA_F_NODAD)) 3729 ifa->flags |= IFA_F_TENTATIVE; 3730 3731 rt = ifa->rt; 3732 ifa->rt = NULL; 3733 } else { 3734 state = ifa->state; 3735 ifa->state = INET6_IFADDR_STATE_DEAD; 3736 } 3737 3738 spin_unlock_bh(&ifa->lock); 3739 3740 if (rt) 3741 ip6_del_rt(net, rt); 3742 3743 if (state != INET6_IFADDR_STATE_DEAD) { 3744 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3745 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3746 } else { 3747 if (idev->cnf.forwarding) 3748 addrconf_leave_anycast(ifa); 3749 addrconf_leave_solict(ifa->idev, &ifa->addr); 3750 } 3751 3752 write_lock_bh(&idev->lock); 3753 if (!keep) { 3754 list_del_rcu(&ifa->if_list); 3755 in6_ifa_put(ifa); 3756 } 3757 } 3758 3759 write_unlock_bh(&idev->lock); 3760 3761 /* Step 5: Discard anycast and multicast list */ 3762 if (how) { 3763 ipv6_ac_destroy_dev(idev); 3764 ipv6_mc_destroy_dev(idev); 3765 } else { 3766 ipv6_mc_down(idev); 3767 } 3768 3769 idev->tstamp = jiffies; 3770 3771 /* Last: Shot the device (if unregistered) */ 3772 if (how) { 3773 addrconf_sysctl_unregister(idev); 3774 neigh_parms_release(&nd_tbl, idev->nd_parms); 3775 neigh_ifdown(&nd_tbl, dev); 3776 in6_dev_put(idev); 3777 } 3778 return 0; 3779 } 3780 3781 static void addrconf_rs_timer(struct timer_list *t) 3782 { 3783 struct inet6_dev *idev = from_timer(idev, t, rs_timer); 3784 struct net_device *dev = idev->dev; 3785 struct in6_addr lladdr; 3786 3787 write_lock(&idev->lock); 3788 if (idev->dead || !(idev->if_flags & IF_READY)) 3789 goto out; 3790 3791 if (!ipv6_accept_ra(idev)) 3792 goto out; 3793 3794 /* Announcement received after solicitation was sent */ 3795 if (idev->if_flags & IF_RA_RCVD) 3796 goto out; 3797 3798 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3799 write_unlock(&idev->lock); 3800 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3801 ndisc_send_rs(dev, &lladdr, 3802 &in6addr_linklocal_allrouters); 3803 else 3804 goto put; 3805 3806 write_lock(&idev->lock); 3807 idev->rs_interval = rfc3315_s14_backoff_update( 3808 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3809 /* The wait after the last probe can be shorter */ 3810 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3811 idev->cnf.rtr_solicits) ? 3812 idev->cnf.rtr_solicit_delay : 3813 idev->rs_interval); 3814 } else { 3815 /* 3816 * Note: we do not support deprecated "all on-link" 3817 * assumption any longer. 3818 */ 3819 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3820 } 3821 3822 out: 3823 write_unlock(&idev->lock); 3824 put: 3825 in6_dev_put(idev); 3826 } 3827 3828 /* 3829 * Duplicate Address Detection 3830 */ 3831 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3832 { 3833 unsigned long rand_num; 3834 struct inet6_dev *idev = ifp->idev; 3835 u64 nonce; 3836 3837 if (ifp->flags & IFA_F_OPTIMISTIC) 3838 rand_num = 0; 3839 else 3840 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3841 3842 nonce = 0; 3843 if (idev->cnf.enhanced_dad || 3844 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 3845 do 3846 get_random_bytes(&nonce, 6); 3847 while (nonce == 0); 3848 } 3849 ifp->dad_nonce = nonce; 3850 ifp->dad_probes = idev->cnf.dad_transmits; 3851 addrconf_mod_dad_work(ifp, rand_num); 3852 } 3853 3854 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3855 { 3856 struct inet6_dev *idev = ifp->idev; 3857 struct net_device *dev = idev->dev; 3858 bool bump_id, notify = false; 3859 struct net *net; 3860 3861 addrconf_join_solict(dev, &ifp->addr); 3862 3863 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3864 3865 read_lock_bh(&idev->lock); 3866 spin_lock(&ifp->lock); 3867 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3868 goto out; 3869 3870 net = dev_net(dev); 3871 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3872 (net->ipv6.devconf_all->accept_dad < 1 && 3873 idev->cnf.accept_dad < 1) || 3874 !(ifp->flags&IFA_F_TENTATIVE) || 3875 ifp->flags & IFA_F_NODAD) { 3876 bool send_na = false; 3877 3878 if (ifp->flags & IFA_F_TENTATIVE && 3879 !(ifp->flags & IFA_F_OPTIMISTIC)) 3880 send_na = true; 3881 bump_id = ifp->flags & IFA_F_TENTATIVE; 3882 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3883 spin_unlock(&ifp->lock); 3884 read_unlock_bh(&idev->lock); 3885 3886 addrconf_dad_completed(ifp, bump_id, send_na); 3887 return; 3888 } 3889 3890 if (!(idev->if_flags & IF_READY)) { 3891 spin_unlock(&ifp->lock); 3892 read_unlock_bh(&idev->lock); 3893 /* 3894 * If the device is not ready: 3895 * - keep it tentative if it is a permanent address. 3896 * - otherwise, kill it. 3897 */ 3898 in6_ifa_hold(ifp); 3899 addrconf_dad_stop(ifp, 0); 3900 return; 3901 } 3902 3903 /* 3904 * Optimistic nodes can start receiving 3905 * Frames right away 3906 */ 3907 if (ifp->flags & IFA_F_OPTIMISTIC) { 3908 ip6_ins_rt(net, ifp->rt); 3909 if (ipv6_use_optimistic_addr(net, idev)) { 3910 /* Because optimistic nodes can use this address, 3911 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3912 */ 3913 notify = true; 3914 } 3915 } 3916 3917 addrconf_dad_kick(ifp); 3918 out: 3919 spin_unlock(&ifp->lock); 3920 read_unlock_bh(&idev->lock); 3921 if (notify) 3922 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3923 } 3924 3925 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3926 { 3927 bool begin_dad = false; 3928 3929 spin_lock_bh(&ifp->lock); 3930 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3931 ifp->state = INET6_IFADDR_STATE_PREDAD; 3932 begin_dad = true; 3933 } 3934 spin_unlock_bh(&ifp->lock); 3935 3936 if (begin_dad) 3937 addrconf_mod_dad_work(ifp, 0); 3938 } 3939 3940 static void addrconf_dad_work(struct work_struct *w) 3941 { 3942 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3943 struct inet6_ifaddr, 3944 dad_work); 3945 struct inet6_dev *idev = ifp->idev; 3946 bool bump_id, disable_ipv6 = false; 3947 struct in6_addr mcaddr; 3948 3949 enum { 3950 DAD_PROCESS, 3951 DAD_BEGIN, 3952 DAD_ABORT, 3953 } action = DAD_PROCESS; 3954 3955 rtnl_lock(); 3956 3957 spin_lock_bh(&ifp->lock); 3958 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 3959 action = DAD_BEGIN; 3960 ifp->state = INET6_IFADDR_STATE_DAD; 3961 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 3962 action = DAD_ABORT; 3963 ifp->state = INET6_IFADDR_STATE_POSTDAD; 3964 3965 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 || 3966 idev->cnf.accept_dad > 1) && 3967 !idev->cnf.disable_ipv6 && 3968 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 3969 struct in6_addr addr; 3970 3971 addr.s6_addr32[0] = htonl(0xfe800000); 3972 addr.s6_addr32[1] = 0; 3973 3974 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 3975 ipv6_addr_equal(&ifp->addr, &addr)) { 3976 /* DAD failed for link-local based on MAC */ 3977 idev->cnf.disable_ipv6 = 1; 3978 3979 pr_info("%s: IPv6 being disabled!\n", 3980 ifp->idev->dev->name); 3981 disable_ipv6 = true; 3982 } 3983 } 3984 } 3985 spin_unlock_bh(&ifp->lock); 3986 3987 if (action == DAD_BEGIN) { 3988 addrconf_dad_begin(ifp); 3989 goto out; 3990 } else if (action == DAD_ABORT) { 3991 in6_ifa_hold(ifp); 3992 addrconf_dad_stop(ifp, 1); 3993 if (disable_ipv6) 3994 addrconf_ifdown(idev->dev, 0); 3995 goto out; 3996 } 3997 3998 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3999 goto out; 4000 4001 write_lock_bh(&idev->lock); 4002 if (idev->dead || !(idev->if_flags & IF_READY)) { 4003 write_unlock_bh(&idev->lock); 4004 goto out; 4005 } 4006 4007 spin_lock(&ifp->lock); 4008 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 4009 spin_unlock(&ifp->lock); 4010 write_unlock_bh(&idev->lock); 4011 goto out; 4012 } 4013 4014 if (ifp->dad_probes == 0) { 4015 bool send_na = false; 4016 4017 /* 4018 * DAD was successful 4019 */ 4020 4021 if (ifp->flags & IFA_F_TENTATIVE && 4022 !(ifp->flags & IFA_F_OPTIMISTIC)) 4023 send_na = true; 4024 bump_id = ifp->flags & IFA_F_TENTATIVE; 4025 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4026 spin_unlock(&ifp->lock); 4027 write_unlock_bh(&idev->lock); 4028 4029 addrconf_dad_completed(ifp, bump_id, send_na); 4030 4031 goto out; 4032 } 4033 4034 ifp->dad_probes--; 4035 addrconf_mod_dad_work(ifp, 4036 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 4037 spin_unlock(&ifp->lock); 4038 write_unlock_bh(&idev->lock); 4039 4040 /* send a neighbour solicitation for our addr */ 4041 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 4042 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 4043 ifp->dad_nonce); 4044 out: 4045 in6_ifa_put(ifp); 4046 rtnl_unlock(); 4047 } 4048 4049 /* ifp->idev must be at least read locked */ 4050 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4051 { 4052 struct inet6_ifaddr *ifpiter; 4053 struct inet6_dev *idev = ifp->idev; 4054 4055 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4056 if (ifpiter->scope > IFA_LINK) 4057 break; 4058 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4059 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4060 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4061 IFA_F_PERMANENT) 4062 return false; 4063 } 4064 return true; 4065 } 4066 4067 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 4068 bool send_na) 4069 { 4070 struct net_device *dev = ifp->idev->dev; 4071 struct in6_addr lladdr; 4072 bool send_rs, send_mld; 4073 4074 addrconf_del_dad_work(ifp); 4075 4076 /* 4077 * Configure the address for reception. Now it is valid. 4078 */ 4079 4080 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4081 4082 /* If added prefix is link local and we are prepared to process 4083 router advertisements, start sending router solicitations. 4084 */ 4085 4086 read_lock_bh(&ifp->idev->lock); 4087 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4088 send_rs = send_mld && 4089 ipv6_accept_ra(ifp->idev) && 4090 ifp->idev->cnf.rtr_solicits != 0 && 4091 (dev->flags&IFF_LOOPBACK) == 0; 4092 read_unlock_bh(&ifp->idev->lock); 4093 4094 /* While dad is in progress mld report's source address is in6_addrany. 4095 * Resend with proper ll now. 4096 */ 4097 if (send_mld) 4098 ipv6_mc_dad_complete(ifp->idev); 4099 4100 /* send unsolicited NA if enabled */ 4101 if (send_na && 4102 (ifp->idev->cnf.ndisc_notify || 4103 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) { 4104 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr, 4105 /*router=*/ !!ifp->idev->cnf.forwarding, 4106 /*solicited=*/ false, /*override=*/ true, 4107 /*inc_opt=*/ true); 4108 } 4109 4110 if (send_rs) { 4111 /* 4112 * If a host as already performed a random delay 4113 * [...] as part of DAD [...] there is no need 4114 * to delay again before sending the first RS 4115 */ 4116 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4117 return; 4118 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4119 4120 write_lock_bh(&ifp->idev->lock); 4121 spin_lock(&ifp->lock); 4122 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4123 ifp->idev->cnf.rtr_solicit_interval); 4124 ifp->idev->rs_probes = 1; 4125 ifp->idev->if_flags |= IF_RS_SENT; 4126 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4127 spin_unlock(&ifp->lock); 4128 write_unlock_bh(&ifp->idev->lock); 4129 } 4130 4131 if (bump_id) 4132 rt_genid_bump_ipv6(dev_net(dev)); 4133 4134 /* Make sure that a new temporary address will be created 4135 * before this temporary address becomes deprecated. 4136 */ 4137 if (ifp->flags & IFA_F_TEMPORARY) 4138 addrconf_verify_rtnl(); 4139 } 4140 4141 static void addrconf_dad_run(struct inet6_dev *idev) 4142 { 4143 struct inet6_ifaddr *ifp; 4144 4145 read_lock_bh(&idev->lock); 4146 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4147 spin_lock(&ifp->lock); 4148 if (ifp->flags & IFA_F_TENTATIVE && 4149 ifp->state == INET6_IFADDR_STATE_DAD) 4150 addrconf_dad_kick(ifp); 4151 spin_unlock(&ifp->lock); 4152 } 4153 read_unlock_bh(&idev->lock); 4154 } 4155 4156 #ifdef CONFIG_PROC_FS 4157 struct if6_iter_state { 4158 struct seq_net_private p; 4159 int bucket; 4160 int offset; 4161 }; 4162 4163 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4164 { 4165 struct if6_iter_state *state = seq->private; 4166 struct net *net = seq_file_net(seq); 4167 struct inet6_ifaddr *ifa = NULL; 4168 int p = 0; 4169 4170 /* initial bucket if pos is 0 */ 4171 if (pos == 0) { 4172 state->bucket = 0; 4173 state->offset = 0; 4174 } 4175 4176 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4177 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket], 4178 addr_lst) { 4179 if (!net_eq(dev_net(ifa->idev->dev), net)) 4180 continue; 4181 /* sync with offset */ 4182 if (p < state->offset) { 4183 p++; 4184 continue; 4185 } 4186 state->offset++; 4187 return ifa; 4188 } 4189 4190 /* prepare for next bucket */ 4191 state->offset = 0; 4192 p = 0; 4193 } 4194 return NULL; 4195 } 4196 4197 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4198 struct inet6_ifaddr *ifa) 4199 { 4200 struct if6_iter_state *state = seq->private; 4201 struct net *net = seq_file_net(seq); 4202 4203 hlist_for_each_entry_continue_rcu(ifa, addr_lst) { 4204 if (!net_eq(dev_net(ifa->idev->dev), net)) 4205 continue; 4206 state->offset++; 4207 return ifa; 4208 } 4209 4210 while (++state->bucket < IN6_ADDR_HSIZE) { 4211 state->offset = 0; 4212 hlist_for_each_entry_rcu(ifa, 4213 &inet6_addr_lst[state->bucket], addr_lst) { 4214 if (!net_eq(dev_net(ifa->idev->dev), net)) 4215 continue; 4216 state->offset++; 4217 return ifa; 4218 } 4219 } 4220 4221 return NULL; 4222 } 4223 4224 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4225 __acquires(rcu) 4226 { 4227 rcu_read_lock(); 4228 return if6_get_first(seq, *pos); 4229 } 4230 4231 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4232 { 4233 struct inet6_ifaddr *ifa; 4234 4235 ifa = if6_get_next(seq, v); 4236 ++*pos; 4237 return ifa; 4238 } 4239 4240 static void if6_seq_stop(struct seq_file *seq, void *v) 4241 __releases(rcu) 4242 { 4243 rcu_read_unlock(); 4244 } 4245 4246 static int if6_seq_show(struct seq_file *seq, void *v) 4247 { 4248 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4249 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4250 &ifp->addr, 4251 ifp->idev->dev->ifindex, 4252 ifp->prefix_len, 4253 ifp->scope, 4254 (u8) ifp->flags, 4255 ifp->idev->dev->name); 4256 return 0; 4257 } 4258 4259 static const struct seq_operations if6_seq_ops = { 4260 .start = if6_seq_start, 4261 .next = if6_seq_next, 4262 .show = if6_seq_show, 4263 .stop = if6_seq_stop, 4264 }; 4265 4266 static int if6_seq_open(struct inode *inode, struct file *file) 4267 { 4268 return seq_open_net(inode, file, &if6_seq_ops, 4269 sizeof(struct if6_iter_state)); 4270 } 4271 4272 static const struct file_operations if6_fops = { 4273 .open = if6_seq_open, 4274 .read = seq_read, 4275 .llseek = seq_lseek, 4276 .release = seq_release_net, 4277 }; 4278 4279 static int __net_init if6_proc_net_init(struct net *net) 4280 { 4281 if (!proc_create("if_inet6", 0444, net->proc_net, &if6_fops)) 4282 return -ENOMEM; 4283 return 0; 4284 } 4285 4286 static void __net_exit if6_proc_net_exit(struct net *net) 4287 { 4288 remove_proc_entry("if_inet6", net->proc_net); 4289 } 4290 4291 static struct pernet_operations if6_proc_net_ops = { 4292 .init = if6_proc_net_init, 4293 .exit = if6_proc_net_exit, 4294 }; 4295 4296 int __init if6_proc_init(void) 4297 { 4298 return register_pernet_subsys(&if6_proc_net_ops); 4299 } 4300 4301 void if6_proc_exit(void) 4302 { 4303 unregister_pernet_subsys(&if6_proc_net_ops); 4304 } 4305 #endif /* CONFIG_PROC_FS */ 4306 4307 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4308 /* Check if address is a home address configured on any interface. */ 4309 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4310 { 4311 unsigned int hash = inet6_addr_hash(net, addr); 4312 struct inet6_ifaddr *ifp = NULL; 4313 int ret = 0; 4314 4315 rcu_read_lock(); 4316 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 4317 if (!net_eq(dev_net(ifp->idev->dev), net)) 4318 continue; 4319 if (ipv6_addr_equal(&ifp->addr, addr) && 4320 (ifp->flags & IFA_F_HOMEADDRESS)) { 4321 ret = 1; 4322 break; 4323 } 4324 } 4325 rcu_read_unlock(); 4326 return ret; 4327 } 4328 #endif 4329 4330 /* 4331 * Periodic address status verification 4332 */ 4333 4334 static void addrconf_verify_rtnl(void) 4335 { 4336 unsigned long now, next, next_sec, next_sched; 4337 struct inet6_ifaddr *ifp; 4338 int i; 4339 4340 ASSERT_RTNL(); 4341 4342 rcu_read_lock_bh(); 4343 now = jiffies; 4344 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4345 4346 cancel_delayed_work(&addr_chk_work); 4347 4348 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4349 restart: 4350 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4351 unsigned long age; 4352 4353 /* When setting preferred_lft to a value not zero or 4354 * infinity, while valid_lft is infinity 4355 * IFA_F_PERMANENT has a non-infinity life time. 4356 */ 4357 if ((ifp->flags & IFA_F_PERMANENT) && 4358 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4359 continue; 4360 4361 spin_lock(&ifp->lock); 4362 /* We try to batch several events at once. */ 4363 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4364 4365 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4366 age >= ifp->valid_lft) { 4367 spin_unlock(&ifp->lock); 4368 in6_ifa_hold(ifp); 4369 ipv6_del_addr(ifp); 4370 goto restart; 4371 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4372 spin_unlock(&ifp->lock); 4373 continue; 4374 } else if (age >= ifp->prefered_lft) { 4375 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4376 int deprecate = 0; 4377 4378 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4379 deprecate = 1; 4380 ifp->flags |= IFA_F_DEPRECATED; 4381 } 4382 4383 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4384 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4385 next = ifp->tstamp + ifp->valid_lft * HZ; 4386 4387 spin_unlock(&ifp->lock); 4388 4389 if (deprecate) { 4390 in6_ifa_hold(ifp); 4391 4392 ipv6_ifa_notify(0, ifp); 4393 in6_ifa_put(ifp); 4394 goto restart; 4395 } 4396 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4397 !(ifp->flags&IFA_F_TENTATIVE)) { 4398 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4399 ifp->idev->cnf.dad_transmits * 4400 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 4401 4402 if (age >= ifp->prefered_lft - regen_advance) { 4403 struct inet6_ifaddr *ifpub = ifp->ifpub; 4404 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4405 next = ifp->tstamp + ifp->prefered_lft * HZ; 4406 if (!ifp->regen_count && ifpub) { 4407 ifp->regen_count++; 4408 in6_ifa_hold(ifp); 4409 in6_ifa_hold(ifpub); 4410 spin_unlock(&ifp->lock); 4411 4412 spin_lock(&ifpub->lock); 4413 ifpub->regen_count = 0; 4414 spin_unlock(&ifpub->lock); 4415 rcu_read_unlock_bh(); 4416 ipv6_create_tempaddr(ifpub, ifp, true); 4417 in6_ifa_put(ifpub); 4418 in6_ifa_put(ifp); 4419 rcu_read_lock_bh(); 4420 goto restart; 4421 } 4422 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4423 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4424 spin_unlock(&ifp->lock); 4425 } else { 4426 /* ifp->prefered_lft <= ifp->valid_lft */ 4427 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4428 next = ifp->tstamp + ifp->prefered_lft * HZ; 4429 spin_unlock(&ifp->lock); 4430 } 4431 } 4432 } 4433 4434 next_sec = round_jiffies_up(next); 4435 next_sched = next; 4436 4437 /* If rounded timeout is accurate enough, accept it. */ 4438 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4439 next_sched = next_sec; 4440 4441 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4442 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4443 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4444 4445 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4446 now, next, next_sec, next_sched); 4447 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4448 rcu_read_unlock_bh(); 4449 } 4450 4451 static void addrconf_verify_work(struct work_struct *w) 4452 { 4453 rtnl_lock(); 4454 addrconf_verify_rtnl(); 4455 rtnl_unlock(); 4456 } 4457 4458 static void addrconf_verify(void) 4459 { 4460 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4461 } 4462 4463 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4464 struct in6_addr **peer_pfx) 4465 { 4466 struct in6_addr *pfx = NULL; 4467 4468 *peer_pfx = NULL; 4469 4470 if (addr) 4471 pfx = nla_data(addr); 4472 4473 if (local) { 4474 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4475 *peer_pfx = pfx; 4476 pfx = nla_data(local); 4477 } 4478 4479 return pfx; 4480 } 4481 4482 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4483 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4484 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4485 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4486 [IFA_FLAGS] = { .len = sizeof(u32) }, 4487 }; 4488 4489 static int 4490 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4491 struct netlink_ext_ack *extack) 4492 { 4493 struct net *net = sock_net(skb->sk); 4494 struct ifaddrmsg *ifm; 4495 struct nlattr *tb[IFA_MAX+1]; 4496 struct in6_addr *pfx, *peer_pfx; 4497 u32 ifa_flags; 4498 int err; 4499 4500 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4501 extack); 4502 if (err < 0) 4503 return err; 4504 4505 ifm = nlmsg_data(nlh); 4506 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4507 if (!pfx) 4508 return -EINVAL; 4509 4510 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4511 4512 /* We ignore other flags so far. */ 4513 ifa_flags &= IFA_F_MANAGETEMPADDR; 4514 4515 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4516 ifm->ifa_prefixlen); 4517 } 4518 4519 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags, 4520 u32 prefered_lft, u32 valid_lft) 4521 { 4522 u32 flags; 4523 clock_t expires; 4524 unsigned long timeout; 4525 bool was_managetempaddr; 4526 bool had_prefixroute; 4527 4528 ASSERT_RTNL(); 4529 4530 if (!valid_lft || (prefered_lft > valid_lft)) 4531 return -EINVAL; 4532 4533 if (ifa_flags & IFA_F_MANAGETEMPADDR && 4534 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4535 return -EINVAL; 4536 4537 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED) 4538 ifa_flags &= ~IFA_F_OPTIMISTIC; 4539 4540 timeout = addrconf_timeout_fixup(valid_lft, HZ); 4541 if (addrconf_finite_timeout(timeout)) { 4542 expires = jiffies_to_clock_t(timeout * HZ); 4543 valid_lft = timeout; 4544 flags = RTF_EXPIRES; 4545 } else { 4546 expires = 0; 4547 flags = 0; 4548 ifa_flags |= IFA_F_PERMANENT; 4549 } 4550 4551 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 4552 if (addrconf_finite_timeout(timeout)) { 4553 if (timeout == 0) 4554 ifa_flags |= IFA_F_DEPRECATED; 4555 prefered_lft = timeout; 4556 } 4557 4558 spin_lock_bh(&ifp->lock); 4559 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4560 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4561 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4562 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4563 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4564 IFA_F_NOPREFIXROUTE); 4565 ifp->flags |= ifa_flags; 4566 ifp->tstamp = jiffies; 4567 ifp->valid_lft = valid_lft; 4568 ifp->prefered_lft = prefered_lft; 4569 4570 spin_unlock_bh(&ifp->lock); 4571 if (!(ifp->flags&IFA_F_TENTATIVE)) 4572 ipv6_ifa_notify(0, ifp); 4573 4574 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 4575 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4576 ifp->idev->dev, expires, flags, 4577 GFP_KERNEL); 4578 } else if (had_prefixroute) { 4579 enum cleanup_prefix_rt_t action; 4580 unsigned long rt_expires; 4581 4582 write_lock_bh(&ifp->idev->lock); 4583 action = check_cleanup_prefix_route(ifp, &rt_expires); 4584 write_unlock_bh(&ifp->idev->lock); 4585 4586 if (action != CLEANUP_PREFIX_RT_NOP) { 4587 cleanup_prefix_route(ifp, rt_expires, 4588 action == CLEANUP_PREFIX_RT_DEL); 4589 } 4590 } 4591 4592 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4593 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR)) 4594 valid_lft = prefered_lft = 0; 4595 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft, 4596 !was_managetempaddr, jiffies); 4597 } 4598 4599 addrconf_verify_rtnl(); 4600 4601 return 0; 4602 } 4603 4604 static int 4605 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4606 struct netlink_ext_ack *extack) 4607 { 4608 struct net *net = sock_net(skb->sk); 4609 struct ifaddrmsg *ifm; 4610 struct nlattr *tb[IFA_MAX+1]; 4611 struct in6_addr *pfx, *peer_pfx; 4612 struct inet6_ifaddr *ifa; 4613 struct net_device *dev; 4614 struct inet6_dev *idev; 4615 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 4616 u32 ifa_flags; 4617 int err; 4618 4619 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4620 extack); 4621 if (err < 0) 4622 return err; 4623 4624 ifm = nlmsg_data(nlh); 4625 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4626 if (!pfx) 4627 return -EINVAL; 4628 4629 if (tb[IFA_CACHEINFO]) { 4630 struct ifa_cacheinfo *ci; 4631 4632 ci = nla_data(tb[IFA_CACHEINFO]); 4633 valid_lft = ci->ifa_valid; 4634 preferred_lft = ci->ifa_prefered; 4635 } else { 4636 preferred_lft = INFINITY_LIFE_TIME; 4637 valid_lft = INFINITY_LIFE_TIME; 4638 } 4639 4640 dev = __dev_get_by_index(net, ifm->ifa_index); 4641 if (!dev) 4642 return -ENODEV; 4643 4644 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4645 4646 /* We ignore other flags so far. */ 4647 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4648 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC; 4649 4650 idev = ipv6_find_idev(dev); 4651 if (IS_ERR(idev)) 4652 return PTR_ERR(idev); 4653 4654 if (!ipv6_allow_optimistic_dad(net, idev)) 4655 ifa_flags &= ~IFA_F_OPTIMISTIC; 4656 4657 if (ifa_flags & IFA_F_NODAD && ifa_flags & IFA_F_OPTIMISTIC) { 4658 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive"); 4659 return -EINVAL; 4660 } 4661 4662 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 4663 if (!ifa) { 4664 /* 4665 * It would be best to check for !NLM_F_CREATE here but 4666 * userspace already relies on not having to provide this. 4667 */ 4668 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 4669 ifm->ifa_prefixlen, ifa_flags, 4670 preferred_lft, valid_lft, extack); 4671 } 4672 4673 if (nlh->nlmsg_flags & NLM_F_EXCL || 4674 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4675 err = -EEXIST; 4676 else 4677 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 4678 4679 in6_ifa_put(ifa); 4680 4681 return err; 4682 } 4683 4684 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4685 u8 scope, int ifindex) 4686 { 4687 struct ifaddrmsg *ifm; 4688 4689 ifm = nlmsg_data(nlh); 4690 ifm->ifa_family = AF_INET6; 4691 ifm->ifa_prefixlen = prefixlen; 4692 ifm->ifa_flags = flags; 4693 ifm->ifa_scope = scope; 4694 ifm->ifa_index = ifindex; 4695 } 4696 4697 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4698 unsigned long tstamp, u32 preferred, u32 valid) 4699 { 4700 struct ifa_cacheinfo ci; 4701 4702 ci.cstamp = cstamp_delta(cstamp); 4703 ci.tstamp = cstamp_delta(tstamp); 4704 ci.ifa_prefered = preferred; 4705 ci.ifa_valid = valid; 4706 4707 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4708 } 4709 4710 static inline int rt_scope(int ifa_scope) 4711 { 4712 if (ifa_scope & IFA_HOST) 4713 return RT_SCOPE_HOST; 4714 else if (ifa_scope & IFA_LINK) 4715 return RT_SCOPE_LINK; 4716 else if (ifa_scope & IFA_SITE) 4717 return RT_SCOPE_SITE; 4718 else 4719 return RT_SCOPE_UNIVERSE; 4720 } 4721 4722 static inline int inet6_ifaddr_msgsize(void) 4723 { 4724 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4725 + nla_total_size(16) /* IFA_LOCAL */ 4726 + nla_total_size(16) /* IFA_ADDRESS */ 4727 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4728 + nla_total_size(4) /* IFA_FLAGS */; 4729 } 4730 4731 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4732 u32 portid, u32 seq, int event, unsigned int flags) 4733 { 4734 struct nlmsghdr *nlh; 4735 u32 preferred, valid; 4736 4737 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4738 if (!nlh) 4739 return -EMSGSIZE; 4740 4741 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4742 ifa->idev->dev->ifindex); 4743 4744 if (!((ifa->flags&IFA_F_PERMANENT) && 4745 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4746 preferred = ifa->prefered_lft; 4747 valid = ifa->valid_lft; 4748 if (preferred != INFINITY_LIFE_TIME) { 4749 long tval = (jiffies - ifa->tstamp)/HZ; 4750 if (preferred > tval) 4751 preferred -= tval; 4752 else 4753 preferred = 0; 4754 if (valid != INFINITY_LIFE_TIME) { 4755 if (valid > tval) 4756 valid -= tval; 4757 else 4758 valid = 0; 4759 } 4760 } 4761 } else { 4762 preferred = INFINITY_LIFE_TIME; 4763 valid = INFINITY_LIFE_TIME; 4764 } 4765 4766 if (!ipv6_addr_any(&ifa->peer_addr)) { 4767 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4768 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4769 goto error; 4770 } else 4771 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4772 goto error; 4773 4774 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4775 goto error; 4776 4777 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4778 goto error; 4779 4780 nlmsg_end(skb, nlh); 4781 return 0; 4782 4783 error: 4784 nlmsg_cancel(skb, nlh); 4785 return -EMSGSIZE; 4786 } 4787 4788 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4789 u32 portid, u32 seq, int event, u16 flags) 4790 { 4791 struct nlmsghdr *nlh; 4792 u8 scope = RT_SCOPE_UNIVERSE; 4793 int ifindex = ifmca->idev->dev->ifindex; 4794 4795 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4796 scope = RT_SCOPE_SITE; 4797 4798 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4799 if (!nlh) 4800 return -EMSGSIZE; 4801 4802 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4803 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 4804 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4805 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4806 nlmsg_cancel(skb, nlh); 4807 return -EMSGSIZE; 4808 } 4809 4810 nlmsg_end(skb, nlh); 4811 return 0; 4812 } 4813 4814 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4815 u32 portid, u32 seq, int event, unsigned int flags) 4816 { 4817 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt); 4818 int ifindex = dev ? dev->ifindex : 1; 4819 struct nlmsghdr *nlh; 4820 u8 scope = RT_SCOPE_UNIVERSE; 4821 4822 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4823 scope = RT_SCOPE_SITE; 4824 4825 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4826 if (!nlh) 4827 return -EMSGSIZE; 4828 4829 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4830 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 4831 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4832 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4833 nlmsg_cancel(skb, nlh); 4834 return -EMSGSIZE; 4835 } 4836 4837 nlmsg_end(skb, nlh); 4838 return 0; 4839 } 4840 4841 enum addr_type_t { 4842 UNICAST_ADDR, 4843 MULTICAST_ADDR, 4844 ANYCAST_ADDR, 4845 }; 4846 4847 /* called with rcu_read_lock() */ 4848 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 4849 struct netlink_callback *cb, enum addr_type_t type, 4850 int s_ip_idx, int *p_ip_idx) 4851 { 4852 struct ifmcaddr6 *ifmca; 4853 struct ifacaddr6 *ifaca; 4854 int err = 1; 4855 int ip_idx = *p_ip_idx; 4856 4857 read_lock_bh(&idev->lock); 4858 switch (type) { 4859 case UNICAST_ADDR: { 4860 struct inet6_ifaddr *ifa; 4861 4862 /* unicast address incl. temp addr */ 4863 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4864 if (++ip_idx < s_ip_idx) 4865 continue; 4866 err = inet6_fill_ifaddr(skb, ifa, 4867 NETLINK_CB(cb->skb).portid, 4868 cb->nlh->nlmsg_seq, 4869 RTM_NEWADDR, 4870 NLM_F_MULTI); 4871 if (err < 0) 4872 break; 4873 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4874 } 4875 break; 4876 } 4877 case MULTICAST_ADDR: 4878 /* multicast address */ 4879 for (ifmca = idev->mc_list; ifmca; 4880 ifmca = ifmca->next, ip_idx++) { 4881 if (ip_idx < s_ip_idx) 4882 continue; 4883 err = inet6_fill_ifmcaddr(skb, ifmca, 4884 NETLINK_CB(cb->skb).portid, 4885 cb->nlh->nlmsg_seq, 4886 RTM_GETMULTICAST, 4887 NLM_F_MULTI); 4888 if (err < 0) 4889 break; 4890 } 4891 break; 4892 case ANYCAST_ADDR: 4893 /* anycast address */ 4894 for (ifaca = idev->ac_list; ifaca; 4895 ifaca = ifaca->aca_next, ip_idx++) { 4896 if (ip_idx < s_ip_idx) 4897 continue; 4898 err = inet6_fill_ifacaddr(skb, ifaca, 4899 NETLINK_CB(cb->skb).portid, 4900 cb->nlh->nlmsg_seq, 4901 RTM_GETANYCAST, 4902 NLM_F_MULTI); 4903 if (err < 0) 4904 break; 4905 } 4906 break; 4907 default: 4908 break; 4909 } 4910 read_unlock_bh(&idev->lock); 4911 *p_ip_idx = ip_idx; 4912 return err; 4913 } 4914 4915 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4916 enum addr_type_t type) 4917 { 4918 struct net *net = sock_net(skb->sk); 4919 int h, s_h; 4920 int idx, ip_idx; 4921 int s_idx, s_ip_idx; 4922 struct net_device *dev; 4923 struct inet6_dev *idev; 4924 struct hlist_head *head; 4925 4926 s_h = cb->args[0]; 4927 s_idx = idx = cb->args[1]; 4928 s_ip_idx = ip_idx = cb->args[2]; 4929 4930 rcu_read_lock(); 4931 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4932 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4933 idx = 0; 4934 head = &net->dev_index_head[h]; 4935 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4936 if (idx < s_idx) 4937 goto cont; 4938 if (h > s_h || idx > s_idx) 4939 s_ip_idx = 0; 4940 ip_idx = 0; 4941 idev = __in6_dev_get(dev); 4942 if (!idev) 4943 goto cont; 4944 4945 if (in6_dump_addrs(idev, skb, cb, type, 4946 s_ip_idx, &ip_idx) < 0) 4947 goto done; 4948 cont: 4949 idx++; 4950 } 4951 } 4952 done: 4953 rcu_read_unlock(); 4954 cb->args[0] = h; 4955 cb->args[1] = idx; 4956 cb->args[2] = ip_idx; 4957 4958 return skb->len; 4959 } 4960 4961 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4962 { 4963 enum addr_type_t type = UNICAST_ADDR; 4964 4965 return inet6_dump_addr(skb, cb, type); 4966 } 4967 4968 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4969 { 4970 enum addr_type_t type = MULTICAST_ADDR; 4971 4972 return inet6_dump_addr(skb, cb, type); 4973 } 4974 4975 4976 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4977 { 4978 enum addr_type_t type = ANYCAST_ADDR; 4979 4980 return inet6_dump_addr(skb, cb, type); 4981 } 4982 4983 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 4984 struct netlink_ext_ack *extack) 4985 { 4986 struct net *net = sock_net(in_skb->sk); 4987 struct ifaddrmsg *ifm; 4988 struct nlattr *tb[IFA_MAX+1]; 4989 struct in6_addr *addr = NULL, *peer; 4990 struct net_device *dev = NULL; 4991 struct inet6_ifaddr *ifa; 4992 struct sk_buff *skb; 4993 int err; 4994 4995 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4996 extack); 4997 if (err < 0) 4998 return err; 4999 5000 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 5001 if (!addr) 5002 return -EINVAL; 5003 5004 ifm = nlmsg_data(nlh); 5005 if (ifm->ifa_index) 5006 dev = dev_get_by_index(net, ifm->ifa_index); 5007 5008 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 5009 if (!ifa) { 5010 err = -EADDRNOTAVAIL; 5011 goto errout; 5012 } 5013 5014 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 5015 if (!skb) { 5016 err = -ENOBUFS; 5017 goto errout_ifa; 5018 } 5019 5020 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 5021 nlh->nlmsg_seq, RTM_NEWADDR, 0); 5022 if (err < 0) { 5023 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5024 WARN_ON(err == -EMSGSIZE); 5025 kfree_skb(skb); 5026 goto errout_ifa; 5027 } 5028 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 5029 errout_ifa: 5030 in6_ifa_put(ifa); 5031 errout: 5032 if (dev) 5033 dev_put(dev); 5034 return err; 5035 } 5036 5037 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 5038 { 5039 struct sk_buff *skb; 5040 struct net *net = dev_net(ifa->idev->dev); 5041 int err = -ENOBUFS; 5042 5043 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 5044 if (!skb) 5045 goto errout; 5046 5047 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 5048 if (err < 0) { 5049 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5050 WARN_ON(err == -EMSGSIZE); 5051 kfree_skb(skb); 5052 goto errout; 5053 } 5054 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 5055 return; 5056 errout: 5057 if (err < 0) 5058 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 5059 } 5060 5061 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 5062 __s32 *array, int bytes) 5063 { 5064 BUG_ON(bytes < (DEVCONF_MAX * 4)); 5065 5066 memset(array, 0, bytes); 5067 array[DEVCONF_FORWARDING] = cnf->forwarding; 5068 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 5069 array[DEVCONF_MTU6] = cnf->mtu6; 5070 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 5071 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 5072 array[DEVCONF_AUTOCONF] = cnf->autoconf; 5073 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 5074 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 5075 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5076 jiffies_to_msecs(cnf->rtr_solicit_interval); 5077 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5078 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 5079 array[DEVCONF_RTR_SOLICIT_DELAY] = 5080 jiffies_to_msecs(cnf->rtr_solicit_delay); 5081 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 5082 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5083 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 5084 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5085 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 5086 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 5087 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 5088 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 5089 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 5090 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 5091 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 5092 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 5093 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 5094 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 5095 #ifdef CONFIG_IPV6_ROUTER_PREF 5096 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 5097 array[DEVCONF_RTR_PROBE_INTERVAL] = 5098 jiffies_to_msecs(cnf->rtr_probe_interval); 5099 #ifdef CONFIG_IPV6_ROUTE_INFO 5100 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen; 5101 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 5102 #endif 5103 #endif 5104 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 5105 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 5106 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5107 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 5108 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 5109 #endif 5110 #ifdef CONFIG_IPV6_MROUTE 5111 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 5112 #endif 5113 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 5114 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 5115 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 5116 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 5117 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 5118 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 5119 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 5120 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 5121 /* we omit DEVCONF_STABLE_SECRET for now */ 5122 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 5123 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 5124 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 5125 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5126 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5127 #ifdef CONFIG_IPV6_SEG6_HMAC 5128 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5129 #endif 5130 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5131 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5132 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy; 5133 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass; 5134 } 5135 5136 static inline size_t inet6_ifla6_size(void) 5137 { 5138 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5139 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5140 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5141 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5142 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5143 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 5144 } 5145 5146 static inline size_t inet6_if_nlmsg_size(void) 5147 { 5148 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5149 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5150 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5151 + nla_total_size(4) /* IFLA_MTU */ 5152 + nla_total_size(4) /* IFLA_LINK */ 5153 + nla_total_size(1) /* IFLA_OPERSTATE */ 5154 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5155 } 5156 5157 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5158 int bytes) 5159 { 5160 int i; 5161 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5162 BUG_ON(pad < 0); 5163 5164 /* Use put_unaligned() because stats may not be aligned for u64. */ 5165 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5166 for (i = 1; i < ICMP6_MIB_MAX; i++) 5167 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5168 5169 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5170 } 5171 5172 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5173 int bytes, size_t syncpoff) 5174 { 5175 int i, c; 5176 u64 buff[IPSTATS_MIB_MAX]; 5177 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5178 5179 BUG_ON(pad < 0); 5180 5181 memset(buff, 0, sizeof(buff)); 5182 buff[0] = IPSTATS_MIB_MAX; 5183 5184 for_each_possible_cpu(c) { 5185 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5186 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5187 } 5188 5189 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5190 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5191 } 5192 5193 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5194 int bytes) 5195 { 5196 switch (attrtype) { 5197 case IFLA_INET6_STATS: 5198 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5199 offsetof(struct ipstats_mib, syncp)); 5200 break; 5201 case IFLA_INET6_ICMP6STATS: 5202 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5203 break; 5204 } 5205 } 5206 5207 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5208 u32 ext_filter_mask) 5209 { 5210 struct nlattr *nla; 5211 struct ifla_cacheinfo ci; 5212 5213 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5214 goto nla_put_failure; 5215 ci.max_reasm_len = IPV6_MAXPLEN; 5216 ci.tstamp = cstamp_delta(idev->tstamp); 5217 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5218 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5219 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5220 goto nla_put_failure; 5221 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5222 if (!nla) 5223 goto nla_put_failure; 5224 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5225 5226 /* XXX - MC not implemented */ 5227 5228 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5229 return 0; 5230 5231 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5232 if (!nla) 5233 goto nla_put_failure; 5234 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5235 5236 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5237 if (!nla) 5238 goto nla_put_failure; 5239 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5240 5241 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5242 if (!nla) 5243 goto nla_put_failure; 5244 5245 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5246 goto nla_put_failure; 5247 5248 read_lock_bh(&idev->lock); 5249 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5250 read_unlock_bh(&idev->lock); 5251 5252 return 0; 5253 5254 nla_put_failure: 5255 return -EMSGSIZE; 5256 } 5257 5258 static size_t inet6_get_link_af_size(const struct net_device *dev, 5259 u32 ext_filter_mask) 5260 { 5261 if (!__in6_dev_get(dev)) 5262 return 0; 5263 5264 return inet6_ifla6_size(); 5265 } 5266 5267 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5268 u32 ext_filter_mask) 5269 { 5270 struct inet6_dev *idev = __in6_dev_get(dev); 5271 5272 if (!idev) 5273 return -ENODATA; 5274 5275 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5276 return -EMSGSIZE; 5277 5278 return 0; 5279 } 5280 5281 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 5282 { 5283 struct inet6_ifaddr *ifp; 5284 struct net_device *dev = idev->dev; 5285 bool clear_token, update_rs = false; 5286 struct in6_addr ll_addr; 5287 5288 ASSERT_RTNL(); 5289 5290 if (!token) 5291 return -EINVAL; 5292 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 5293 return -EINVAL; 5294 if (!ipv6_accept_ra(idev)) 5295 return -EINVAL; 5296 if (idev->cnf.rtr_solicits == 0) 5297 return -EINVAL; 5298 5299 write_lock_bh(&idev->lock); 5300 5301 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5302 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5303 5304 write_unlock_bh(&idev->lock); 5305 5306 clear_token = ipv6_addr_any(token); 5307 if (clear_token) 5308 goto update_lft; 5309 5310 if (!idev->dead && (idev->if_flags & IF_READY) && 5311 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5312 IFA_F_OPTIMISTIC)) { 5313 /* If we're not ready, then normal ifup will take care 5314 * of this. Otherwise, we need to request our rs here. 5315 */ 5316 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5317 update_rs = true; 5318 } 5319 5320 update_lft: 5321 write_lock_bh(&idev->lock); 5322 5323 if (update_rs) { 5324 idev->if_flags |= IF_RS_SENT; 5325 idev->rs_interval = rfc3315_s14_backoff_init( 5326 idev->cnf.rtr_solicit_interval); 5327 idev->rs_probes = 1; 5328 addrconf_mod_rs_timer(idev, idev->rs_interval); 5329 } 5330 5331 /* Well, that's kinda nasty ... */ 5332 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5333 spin_lock(&ifp->lock); 5334 if (ifp->tokenized) { 5335 ifp->valid_lft = 0; 5336 ifp->prefered_lft = 0; 5337 } 5338 spin_unlock(&ifp->lock); 5339 } 5340 5341 write_unlock_bh(&idev->lock); 5342 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5343 addrconf_verify_rtnl(); 5344 return 0; 5345 } 5346 5347 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5348 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5349 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5350 }; 5351 5352 static int inet6_validate_link_af(const struct net_device *dev, 5353 const struct nlattr *nla) 5354 { 5355 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5356 5357 if (dev && !__in6_dev_get(dev)) 5358 return -EAFNOSUPPORT; 5359 5360 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy, 5361 NULL); 5362 } 5363 5364 static int check_addr_gen_mode(int mode) 5365 { 5366 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5367 mode != IN6_ADDR_GEN_MODE_NONE && 5368 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5369 mode != IN6_ADDR_GEN_MODE_RANDOM) 5370 return -EINVAL; 5371 return 1; 5372 } 5373 5374 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5375 int mode) 5376 { 5377 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5378 !idev->cnf.stable_secret.initialized && 5379 !net->ipv6.devconf_dflt->stable_secret.initialized) 5380 return -EINVAL; 5381 return 1; 5382 } 5383 5384 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 5385 { 5386 int err = -EINVAL; 5387 struct inet6_dev *idev = __in6_dev_get(dev); 5388 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5389 5390 if (!idev) 5391 return -EAFNOSUPPORT; 5392 5393 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 5394 BUG(); 5395 5396 if (tb[IFLA_INET6_TOKEN]) { 5397 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 5398 if (err) 5399 return err; 5400 } 5401 5402 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5403 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5404 5405 if (check_addr_gen_mode(mode) < 0 || 5406 check_stable_privacy(idev, dev_net(dev), mode) < 0) 5407 return -EINVAL; 5408 5409 idev->cnf.addr_gen_mode = mode; 5410 err = 0; 5411 } 5412 5413 return err; 5414 } 5415 5416 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5417 u32 portid, u32 seq, int event, unsigned int flags) 5418 { 5419 struct net_device *dev = idev->dev; 5420 struct ifinfomsg *hdr; 5421 struct nlmsghdr *nlh; 5422 void *protoinfo; 5423 5424 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5425 if (!nlh) 5426 return -EMSGSIZE; 5427 5428 hdr = nlmsg_data(nlh); 5429 hdr->ifi_family = AF_INET6; 5430 hdr->__ifi_pad = 0; 5431 hdr->ifi_type = dev->type; 5432 hdr->ifi_index = dev->ifindex; 5433 hdr->ifi_flags = dev_get_flags(dev); 5434 hdr->ifi_change = 0; 5435 5436 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5437 (dev->addr_len && 5438 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5439 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5440 (dev->ifindex != dev_get_iflink(dev) && 5441 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5442 nla_put_u8(skb, IFLA_OPERSTATE, 5443 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5444 goto nla_put_failure; 5445 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 5446 if (!protoinfo) 5447 goto nla_put_failure; 5448 5449 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5450 goto nla_put_failure; 5451 5452 nla_nest_end(skb, protoinfo); 5453 nlmsg_end(skb, nlh); 5454 return 0; 5455 5456 nla_put_failure: 5457 nlmsg_cancel(skb, nlh); 5458 return -EMSGSIZE; 5459 } 5460 5461 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5462 { 5463 struct net *net = sock_net(skb->sk); 5464 int h, s_h; 5465 int idx = 0, s_idx; 5466 struct net_device *dev; 5467 struct inet6_dev *idev; 5468 struct hlist_head *head; 5469 5470 s_h = cb->args[0]; 5471 s_idx = cb->args[1]; 5472 5473 rcu_read_lock(); 5474 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5475 idx = 0; 5476 head = &net->dev_index_head[h]; 5477 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5478 if (idx < s_idx) 5479 goto cont; 5480 idev = __in6_dev_get(dev); 5481 if (!idev) 5482 goto cont; 5483 if (inet6_fill_ifinfo(skb, idev, 5484 NETLINK_CB(cb->skb).portid, 5485 cb->nlh->nlmsg_seq, 5486 RTM_NEWLINK, NLM_F_MULTI) < 0) 5487 goto out; 5488 cont: 5489 idx++; 5490 } 5491 } 5492 out: 5493 rcu_read_unlock(); 5494 cb->args[1] = idx; 5495 cb->args[0] = h; 5496 5497 return skb->len; 5498 } 5499 5500 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5501 { 5502 struct sk_buff *skb; 5503 struct net *net = dev_net(idev->dev); 5504 int err = -ENOBUFS; 5505 5506 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5507 if (!skb) 5508 goto errout; 5509 5510 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5511 if (err < 0) { 5512 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5513 WARN_ON(err == -EMSGSIZE); 5514 kfree_skb(skb); 5515 goto errout; 5516 } 5517 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5518 return; 5519 errout: 5520 if (err < 0) 5521 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5522 } 5523 5524 static inline size_t inet6_prefix_nlmsg_size(void) 5525 { 5526 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5527 + nla_total_size(sizeof(struct in6_addr)) 5528 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5529 } 5530 5531 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5532 struct prefix_info *pinfo, u32 portid, u32 seq, 5533 int event, unsigned int flags) 5534 { 5535 struct prefixmsg *pmsg; 5536 struct nlmsghdr *nlh; 5537 struct prefix_cacheinfo ci; 5538 5539 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5540 if (!nlh) 5541 return -EMSGSIZE; 5542 5543 pmsg = nlmsg_data(nlh); 5544 pmsg->prefix_family = AF_INET6; 5545 pmsg->prefix_pad1 = 0; 5546 pmsg->prefix_pad2 = 0; 5547 pmsg->prefix_ifindex = idev->dev->ifindex; 5548 pmsg->prefix_len = pinfo->prefix_len; 5549 pmsg->prefix_type = pinfo->type; 5550 pmsg->prefix_pad3 = 0; 5551 pmsg->prefix_flags = 0; 5552 if (pinfo->onlink) 5553 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 5554 if (pinfo->autoconf) 5555 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 5556 5557 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5558 goto nla_put_failure; 5559 ci.preferred_time = ntohl(pinfo->prefered); 5560 ci.valid_time = ntohl(pinfo->valid); 5561 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 5562 goto nla_put_failure; 5563 nlmsg_end(skb, nlh); 5564 return 0; 5565 5566 nla_put_failure: 5567 nlmsg_cancel(skb, nlh); 5568 return -EMSGSIZE; 5569 } 5570 5571 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 5572 struct prefix_info *pinfo) 5573 { 5574 struct sk_buff *skb; 5575 struct net *net = dev_net(idev->dev); 5576 int err = -ENOBUFS; 5577 5578 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 5579 if (!skb) 5580 goto errout; 5581 5582 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5583 if (err < 0) { 5584 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5585 WARN_ON(err == -EMSGSIZE); 5586 kfree_skb(skb); 5587 goto errout; 5588 } 5589 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5590 return; 5591 errout: 5592 if (err < 0) 5593 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 5594 } 5595 5596 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5597 { 5598 struct net *net = dev_net(ifp->idev->dev); 5599 5600 if (event) 5601 ASSERT_RTNL(); 5602 5603 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 5604 5605 switch (event) { 5606 case RTM_NEWADDR: 5607 /* 5608 * If the address was optimistic 5609 * we inserted the route at the start of 5610 * our DAD process, so we don't need 5611 * to do it again 5612 */ 5613 if (!rcu_access_pointer(ifp->rt->fib6_node)) 5614 ip6_ins_rt(net, ifp->rt); 5615 if (ifp->idev->cnf.forwarding) 5616 addrconf_join_anycast(ifp); 5617 if (!ipv6_addr_any(&ifp->peer_addr)) 5618 addrconf_prefix_route(&ifp->peer_addr, 128, 5619 ifp->idev->dev, 0, 0, 5620 GFP_ATOMIC); 5621 break; 5622 case RTM_DELADDR: 5623 if (ifp->idev->cnf.forwarding) 5624 addrconf_leave_anycast(ifp); 5625 addrconf_leave_solict(ifp->idev, &ifp->addr); 5626 if (!ipv6_addr_any(&ifp->peer_addr)) { 5627 struct fib6_info *rt; 5628 5629 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 5630 ifp->idev->dev, 0, 0); 5631 if (rt) 5632 ip6_del_rt(net, rt); 5633 } 5634 if (ifp->rt) { 5635 ip6_del_rt(net, ifp->rt); 5636 ifp->rt = NULL; 5637 } 5638 rt_genid_bump_ipv6(net); 5639 break; 5640 } 5641 atomic_inc(&net->ipv6.dev_addr_genid); 5642 } 5643 5644 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5645 { 5646 rcu_read_lock_bh(); 5647 if (likely(ifp->idev->dead == 0)) 5648 __ipv6_ifa_notify(event, ifp); 5649 rcu_read_unlock_bh(); 5650 } 5651 5652 #ifdef CONFIG_SYSCTL 5653 5654 static 5655 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 5656 void __user *buffer, size_t *lenp, loff_t *ppos) 5657 { 5658 int *valp = ctl->data; 5659 int val = *valp; 5660 loff_t pos = *ppos; 5661 struct ctl_table lctl; 5662 int ret; 5663 5664 /* 5665 * ctl->data points to idev->cnf.forwarding, we should 5666 * not modify it until we get the rtnl lock. 5667 */ 5668 lctl = *ctl; 5669 lctl.data = &val; 5670 5671 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5672 5673 if (write) 5674 ret = addrconf_fixup_forwarding(ctl, valp, val); 5675 if (ret) 5676 *ppos = pos; 5677 return ret; 5678 } 5679 5680 static 5681 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 5682 void __user *buffer, size_t *lenp, loff_t *ppos) 5683 { 5684 struct inet6_dev *idev = ctl->extra1; 5685 int min_mtu = IPV6_MIN_MTU; 5686 struct ctl_table lctl; 5687 5688 lctl = *ctl; 5689 lctl.extra1 = &min_mtu; 5690 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 5691 5692 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5693 } 5694 5695 static void dev_disable_change(struct inet6_dev *idev) 5696 { 5697 struct netdev_notifier_info info; 5698 5699 if (!idev || !idev->dev) 5700 return; 5701 5702 netdev_notifier_info_init(&info, idev->dev); 5703 if (idev->cnf.disable_ipv6) 5704 addrconf_notify(NULL, NETDEV_DOWN, &info); 5705 else 5706 addrconf_notify(NULL, NETDEV_UP, &info); 5707 } 5708 5709 static void addrconf_disable_change(struct net *net, __s32 newf) 5710 { 5711 struct net_device *dev; 5712 struct inet6_dev *idev; 5713 5714 for_each_netdev(net, dev) { 5715 idev = __in6_dev_get(dev); 5716 if (idev) { 5717 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 5718 idev->cnf.disable_ipv6 = newf; 5719 if (changed) 5720 dev_disable_change(idev); 5721 } 5722 } 5723 } 5724 5725 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 5726 { 5727 struct net *net; 5728 int old; 5729 5730 if (!rtnl_trylock()) 5731 return restart_syscall(); 5732 5733 net = (struct net *)table->extra2; 5734 old = *p; 5735 *p = newf; 5736 5737 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 5738 rtnl_unlock(); 5739 return 0; 5740 } 5741 5742 if (p == &net->ipv6.devconf_all->disable_ipv6) { 5743 net->ipv6.devconf_dflt->disable_ipv6 = newf; 5744 addrconf_disable_change(net, newf); 5745 } else if ((!newf) ^ (!old)) 5746 dev_disable_change((struct inet6_dev *)table->extra1); 5747 5748 rtnl_unlock(); 5749 return 0; 5750 } 5751 5752 static 5753 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 5754 void __user *buffer, size_t *lenp, loff_t *ppos) 5755 { 5756 int *valp = ctl->data; 5757 int val = *valp; 5758 loff_t pos = *ppos; 5759 struct ctl_table lctl; 5760 int ret; 5761 5762 /* 5763 * ctl->data points to idev->cnf.disable_ipv6, we should 5764 * not modify it until we get the rtnl lock. 5765 */ 5766 lctl = *ctl; 5767 lctl.data = &val; 5768 5769 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5770 5771 if (write) 5772 ret = addrconf_disable_ipv6(ctl, valp, val); 5773 if (ret) 5774 *ppos = pos; 5775 return ret; 5776 } 5777 5778 static 5779 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 5780 void __user *buffer, size_t *lenp, loff_t *ppos) 5781 { 5782 int *valp = ctl->data; 5783 int ret; 5784 int old, new; 5785 5786 old = *valp; 5787 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5788 new = *valp; 5789 5790 if (write && old != new) { 5791 struct net *net = ctl->extra2; 5792 5793 if (!rtnl_trylock()) 5794 return restart_syscall(); 5795 5796 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 5797 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5798 NETCONFA_PROXY_NEIGH, 5799 NETCONFA_IFINDEX_DEFAULT, 5800 net->ipv6.devconf_dflt); 5801 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 5802 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5803 NETCONFA_PROXY_NEIGH, 5804 NETCONFA_IFINDEX_ALL, 5805 net->ipv6.devconf_all); 5806 else { 5807 struct inet6_dev *idev = ctl->extra1; 5808 5809 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5810 NETCONFA_PROXY_NEIGH, 5811 idev->dev->ifindex, 5812 &idev->cnf); 5813 } 5814 rtnl_unlock(); 5815 } 5816 5817 return ret; 5818 } 5819 5820 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 5821 void __user *buffer, size_t *lenp, 5822 loff_t *ppos) 5823 { 5824 int ret = 0; 5825 int new_val; 5826 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 5827 struct net *net = (struct net *)ctl->extra2; 5828 5829 if (!rtnl_trylock()) 5830 return restart_syscall(); 5831 5832 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5833 5834 if (write) { 5835 new_val = *((int *)ctl->data); 5836 5837 if (check_addr_gen_mode(new_val) < 0) { 5838 ret = -EINVAL; 5839 goto out; 5840 } 5841 5842 /* request for default */ 5843 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) { 5844 ipv6_devconf_dflt.addr_gen_mode = new_val; 5845 5846 /* request for individual net device */ 5847 } else { 5848 if (!idev) 5849 goto out; 5850 5851 if (check_stable_privacy(idev, net, new_val) < 0) { 5852 ret = -EINVAL; 5853 goto out; 5854 } 5855 5856 if (idev->cnf.addr_gen_mode != new_val) { 5857 idev->cnf.addr_gen_mode = new_val; 5858 addrconf_dev_config(idev->dev); 5859 } 5860 } 5861 } 5862 5863 out: 5864 rtnl_unlock(); 5865 5866 return ret; 5867 } 5868 5869 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 5870 void __user *buffer, size_t *lenp, 5871 loff_t *ppos) 5872 { 5873 int err; 5874 struct in6_addr addr; 5875 char str[IPV6_MAX_STRLEN]; 5876 struct ctl_table lctl = *ctl; 5877 struct net *net = ctl->extra2; 5878 struct ipv6_stable_secret *secret = ctl->data; 5879 5880 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 5881 return -EIO; 5882 5883 lctl.maxlen = IPV6_MAX_STRLEN; 5884 lctl.data = str; 5885 5886 if (!rtnl_trylock()) 5887 return restart_syscall(); 5888 5889 if (!write && !secret->initialized) { 5890 err = -EIO; 5891 goto out; 5892 } 5893 5894 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 5895 if (err >= sizeof(str)) { 5896 err = -EIO; 5897 goto out; 5898 } 5899 5900 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 5901 if (err || !write) 5902 goto out; 5903 5904 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 5905 err = -EIO; 5906 goto out; 5907 } 5908 5909 secret->initialized = true; 5910 secret->secret = addr; 5911 5912 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 5913 struct net_device *dev; 5914 5915 for_each_netdev(net, dev) { 5916 struct inet6_dev *idev = __in6_dev_get(dev); 5917 5918 if (idev) { 5919 idev->cnf.addr_gen_mode = 5920 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5921 } 5922 } 5923 } else { 5924 struct inet6_dev *idev = ctl->extra1; 5925 5926 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5927 } 5928 5929 out: 5930 rtnl_unlock(); 5931 5932 return err; 5933 } 5934 5935 static 5936 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 5937 int write, 5938 void __user *buffer, 5939 size_t *lenp, 5940 loff_t *ppos) 5941 { 5942 int *valp = ctl->data; 5943 int val = *valp; 5944 loff_t pos = *ppos; 5945 struct ctl_table lctl; 5946 int ret; 5947 5948 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 5949 * we should not modify it until we get the rtnl lock. 5950 */ 5951 lctl = *ctl; 5952 lctl.data = &val; 5953 5954 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5955 5956 if (write) 5957 ret = addrconf_fixup_linkdown(ctl, valp, val); 5958 if (ret) 5959 *ppos = pos; 5960 return ret; 5961 } 5962 5963 static 5964 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 5965 { 5966 if (rt) { 5967 if (action) 5968 rt->dst.flags |= DST_NOPOLICY; 5969 else 5970 rt->dst.flags &= ~DST_NOPOLICY; 5971 } 5972 } 5973 5974 static 5975 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 5976 { 5977 struct inet6_ifaddr *ifa; 5978 5979 read_lock_bh(&idev->lock); 5980 list_for_each_entry(ifa, &idev->addr_list, if_list) { 5981 spin_lock(&ifa->lock); 5982 if (ifa->rt) { 5983 struct fib6_info *rt = ifa->rt; 5984 int cpu; 5985 5986 rcu_read_lock(); 5987 ifa->rt->dst_nopolicy = val ? true : false; 5988 if (rt->rt6i_pcpu) { 5989 for_each_possible_cpu(cpu) { 5990 struct rt6_info **rtp; 5991 5992 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu); 5993 addrconf_set_nopolicy(*rtp, val); 5994 } 5995 } 5996 rcu_read_unlock(); 5997 } 5998 spin_unlock(&ifa->lock); 5999 } 6000 read_unlock_bh(&idev->lock); 6001 } 6002 6003 static 6004 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 6005 { 6006 struct inet6_dev *idev; 6007 struct net *net; 6008 6009 if (!rtnl_trylock()) 6010 return restart_syscall(); 6011 6012 *valp = val; 6013 6014 net = (struct net *)ctl->extra2; 6015 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 6016 rtnl_unlock(); 6017 return 0; 6018 } 6019 6020 if (valp == &net->ipv6.devconf_all->disable_policy) { 6021 struct net_device *dev; 6022 6023 for_each_netdev(net, dev) { 6024 idev = __in6_dev_get(dev); 6025 if (idev) 6026 addrconf_disable_policy_idev(idev, val); 6027 } 6028 } else { 6029 idev = (struct inet6_dev *)ctl->extra1; 6030 addrconf_disable_policy_idev(idev, val); 6031 } 6032 6033 rtnl_unlock(); 6034 return 0; 6035 } 6036 6037 static 6038 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 6039 void __user *buffer, size_t *lenp, 6040 loff_t *ppos) 6041 { 6042 int *valp = ctl->data; 6043 int val = *valp; 6044 loff_t pos = *ppos; 6045 struct ctl_table lctl; 6046 int ret; 6047 6048 lctl = *ctl; 6049 lctl.data = &val; 6050 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6051 6052 if (write && (*valp != val)) 6053 ret = addrconf_disable_policy(ctl, valp, val); 6054 6055 if (ret) 6056 *ppos = pos; 6057 6058 return ret; 6059 } 6060 6061 static int minus_one = -1; 6062 static const int zero = 0; 6063 static const int one = 1; 6064 static const int two_five_five = 255; 6065 6066 static const struct ctl_table addrconf_sysctl[] = { 6067 { 6068 .procname = "forwarding", 6069 .data = &ipv6_devconf.forwarding, 6070 .maxlen = sizeof(int), 6071 .mode = 0644, 6072 .proc_handler = addrconf_sysctl_forward, 6073 }, 6074 { 6075 .procname = "hop_limit", 6076 .data = &ipv6_devconf.hop_limit, 6077 .maxlen = sizeof(int), 6078 .mode = 0644, 6079 .proc_handler = proc_dointvec_minmax, 6080 .extra1 = (void *)&one, 6081 .extra2 = (void *)&two_five_five, 6082 }, 6083 { 6084 .procname = "mtu", 6085 .data = &ipv6_devconf.mtu6, 6086 .maxlen = sizeof(int), 6087 .mode = 0644, 6088 .proc_handler = addrconf_sysctl_mtu, 6089 }, 6090 { 6091 .procname = "accept_ra", 6092 .data = &ipv6_devconf.accept_ra, 6093 .maxlen = sizeof(int), 6094 .mode = 0644, 6095 .proc_handler = proc_dointvec, 6096 }, 6097 { 6098 .procname = "accept_redirects", 6099 .data = &ipv6_devconf.accept_redirects, 6100 .maxlen = sizeof(int), 6101 .mode = 0644, 6102 .proc_handler = proc_dointvec, 6103 }, 6104 { 6105 .procname = "autoconf", 6106 .data = &ipv6_devconf.autoconf, 6107 .maxlen = sizeof(int), 6108 .mode = 0644, 6109 .proc_handler = proc_dointvec, 6110 }, 6111 { 6112 .procname = "dad_transmits", 6113 .data = &ipv6_devconf.dad_transmits, 6114 .maxlen = sizeof(int), 6115 .mode = 0644, 6116 .proc_handler = proc_dointvec, 6117 }, 6118 { 6119 .procname = "router_solicitations", 6120 .data = &ipv6_devconf.rtr_solicits, 6121 .maxlen = sizeof(int), 6122 .mode = 0644, 6123 .proc_handler = proc_dointvec_minmax, 6124 .extra1 = &minus_one, 6125 }, 6126 { 6127 .procname = "router_solicitation_interval", 6128 .data = &ipv6_devconf.rtr_solicit_interval, 6129 .maxlen = sizeof(int), 6130 .mode = 0644, 6131 .proc_handler = proc_dointvec_jiffies, 6132 }, 6133 { 6134 .procname = "router_solicitation_max_interval", 6135 .data = &ipv6_devconf.rtr_solicit_max_interval, 6136 .maxlen = sizeof(int), 6137 .mode = 0644, 6138 .proc_handler = proc_dointvec_jiffies, 6139 }, 6140 { 6141 .procname = "router_solicitation_delay", 6142 .data = &ipv6_devconf.rtr_solicit_delay, 6143 .maxlen = sizeof(int), 6144 .mode = 0644, 6145 .proc_handler = proc_dointvec_jiffies, 6146 }, 6147 { 6148 .procname = "force_mld_version", 6149 .data = &ipv6_devconf.force_mld_version, 6150 .maxlen = sizeof(int), 6151 .mode = 0644, 6152 .proc_handler = proc_dointvec, 6153 }, 6154 { 6155 .procname = "mldv1_unsolicited_report_interval", 6156 .data = 6157 &ipv6_devconf.mldv1_unsolicited_report_interval, 6158 .maxlen = sizeof(int), 6159 .mode = 0644, 6160 .proc_handler = proc_dointvec_ms_jiffies, 6161 }, 6162 { 6163 .procname = "mldv2_unsolicited_report_interval", 6164 .data = 6165 &ipv6_devconf.mldv2_unsolicited_report_interval, 6166 .maxlen = sizeof(int), 6167 .mode = 0644, 6168 .proc_handler = proc_dointvec_ms_jiffies, 6169 }, 6170 { 6171 .procname = "use_tempaddr", 6172 .data = &ipv6_devconf.use_tempaddr, 6173 .maxlen = sizeof(int), 6174 .mode = 0644, 6175 .proc_handler = proc_dointvec, 6176 }, 6177 { 6178 .procname = "temp_valid_lft", 6179 .data = &ipv6_devconf.temp_valid_lft, 6180 .maxlen = sizeof(int), 6181 .mode = 0644, 6182 .proc_handler = proc_dointvec, 6183 }, 6184 { 6185 .procname = "temp_prefered_lft", 6186 .data = &ipv6_devconf.temp_prefered_lft, 6187 .maxlen = sizeof(int), 6188 .mode = 0644, 6189 .proc_handler = proc_dointvec, 6190 }, 6191 { 6192 .procname = "regen_max_retry", 6193 .data = &ipv6_devconf.regen_max_retry, 6194 .maxlen = sizeof(int), 6195 .mode = 0644, 6196 .proc_handler = proc_dointvec, 6197 }, 6198 { 6199 .procname = "max_desync_factor", 6200 .data = &ipv6_devconf.max_desync_factor, 6201 .maxlen = sizeof(int), 6202 .mode = 0644, 6203 .proc_handler = proc_dointvec, 6204 }, 6205 { 6206 .procname = "max_addresses", 6207 .data = &ipv6_devconf.max_addresses, 6208 .maxlen = sizeof(int), 6209 .mode = 0644, 6210 .proc_handler = proc_dointvec, 6211 }, 6212 { 6213 .procname = "accept_ra_defrtr", 6214 .data = &ipv6_devconf.accept_ra_defrtr, 6215 .maxlen = sizeof(int), 6216 .mode = 0644, 6217 .proc_handler = proc_dointvec, 6218 }, 6219 { 6220 .procname = "accept_ra_min_hop_limit", 6221 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6222 .maxlen = sizeof(int), 6223 .mode = 0644, 6224 .proc_handler = proc_dointvec, 6225 }, 6226 { 6227 .procname = "accept_ra_pinfo", 6228 .data = &ipv6_devconf.accept_ra_pinfo, 6229 .maxlen = sizeof(int), 6230 .mode = 0644, 6231 .proc_handler = proc_dointvec, 6232 }, 6233 #ifdef CONFIG_IPV6_ROUTER_PREF 6234 { 6235 .procname = "accept_ra_rtr_pref", 6236 .data = &ipv6_devconf.accept_ra_rtr_pref, 6237 .maxlen = sizeof(int), 6238 .mode = 0644, 6239 .proc_handler = proc_dointvec, 6240 }, 6241 { 6242 .procname = "router_probe_interval", 6243 .data = &ipv6_devconf.rtr_probe_interval, 6244 .maxlen = sizeof(int), 6245 .mode = 0644, 6246 .proc_handler = proc_dointvec_jiffies, 6247 }, 6248 #ifdef CONFIG_IPV6_ROUTE_INFO 6249 { 6250 .procname = "accept_ra_rt_info_min_plen", 6251 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6252 .maxlen = sizeof(int), 6253 .mode = 0644, 6254 .proc_handler = proc_dointvec, 6255 }, 6256 { 6257 .procname = "accept_ra_rt_info_max_plen", 6258 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6259 .maxlen = sizeof(int), 6260 .mode = 0644, 6261 .proc_handler = proc_dointvec, 6262 }, 6263 #endif 6264 #endif 6265 { 6266 .procname = "proxy_ndp", 6267 .data = &ipv6_devconf.proxy_ndp, 6268 .maxlen = sizeof(int), 6269 .mode = 0644, 6270 .proc_handler = addrconf_sysctl_proxy_ndp, 6271 }, 6272 { 6273 .procname = "accept_source_route", 6274 .data = &ipv6_devconf.accept_source_route, 6275 .maxlen = sizeof(int), 6276 .mode = 0644, 6277 .proc_handler = proc_dointvec, 6278 }, 6279 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6280 { 6281 .procname = "optimistic_dad", 6282 .data = &ipv6_devconf.optimistic_dad, 6283 .maxlen = sizeof(int), 6284 .mode = 0644, 6285 .proc_handler = proc_dointvec, 6286 }, 6287 { 6288 .procname = "use_optimistic", 6289 .data = &ipv6_devconf.use_optimistic, 6290 .maxlen = sizeof(int), 6291 .mode = 0644, 6292 .proc_handler = proc_dointvec, 6293 }, 6294 #endif 6295 #ifdef CONFIG_IPV6_MROUTE 6296 { 6297 .procname = "mc_forwarding", 6298 .data = &ipv6_devconf.mc_forwarding, 6299 .maxlen = sizeof(int), 6300 .mode = 0444, 6301 .proc_handler = proc_dointvec, 6302 }, 6303 #endif 6304 { 6305 .procname = "disable_ipv6", 6306 .data = &ipv6_devconf.disable_ipv6, 6307 .maxlen = sizeof(int), 6308 .mode = 0644, 6309 .proc_handler = addrconf_sysctl_disable, 6310 }, 6311 { 6312 .procname = "accept_dad", 6313 .data = &ipv6_devconf.accept_dad, 6314 .maxlen = sizeof(int), 6315 .mode = 0644, 6316 .proc_handler = proc_dointvec, 6317 }, 6318 { 6319 .procname = "force_tllao", 6320 .data = &ipv6_devconf.force_tllao, 6321 .maxlen = sizeof(int), 6322 .mode = 0644, 6323 .proc_handler = proc_dointvec 6324 }, 6325 { 6326 .procname = "ndisc_notify", 6327 .data = &ipv6_devconf.ndisc_notify, 6328 .maxlen = sizeof(int), 6329 .mode = 0644, 6330 .proc_handler = proc_dointvec 6331 }, 6332 { 6333 .procname = "suppress_frag_ndisc", 6334 .data = &ipv6_devconf.suppress_frag_ndisc, 6335 .maxlen = sizeof(int), 6336 .mode = 0644, 6337 .proc_handler = proc_dointvec 6338 }, 6339 { 6340 .procname = "accept_ra_from_local", 6341 .data = &ipv6_devconf.accept_ra_from_local, 6342 .maxlen = sizeof(int), 6343 .mode = 0644, 6344 .proc_handler = proc_dointvec, 6345 }, 6346 { 6347 .procname = "accept_ra_mtu", 6348 .data = &ipv6_devconf.accept_ra_mtu, 6349 .maxlen = sizeof(int), 6350 .mode = 0644, 6351 .proc_handler = proc_dointvec, 6352 }, 6353 { 6354 .procname = "stable_secret", 6355 .data = &ipv6_devconf.stable_secret, 6356 .maxlen = IPV6_MAX_STRLEN, 6357 .mode = 0600, 6358 .proc_handler = addrconf_sysctl_stable_secret, 6359 }, 6360 { 6361 .procname = "use_oif_addrs_only", 6362 .data = &ipv6_devconf.use_oif_addrs_only, 6363 .maxlen = sizeof(int), 6364 .mode = 0644, 6365 .proc_handler = proc_dointvec, 6366 }, 6367 { 6368 .procname = "ignore_routes_with_linkdown", 6369 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6370 .maxlen = sizeof(int), 6371 .mode = 0644, 6372 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6373 }, 6374 { 6375 .procname = "drop_unicast_in_l2_multicast", 6376 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6377 .maxlen = sizeof(int), 6378 .mode = 0644, 6379 .proc_handler = proc_dointvec, 6380 }, 6381 { 6382 .procname = "drop_unsolicited_na", 6383 .data = &ipv6_devconf.drop_unsolicited_na, 6384 .maxlen = sizeof(int), 6385 .mode = 0644, 6386 .proc_handler = proc_dointvec, 6387 }, 6388 { 6389 .procname = "keep_addr_on_down", 6390 .data = &ipv6_devconf.keep_addr_on_down, 6391 .maxlen = sizeof(int), 6392 .mode = 0644, 6393 .proc_handler = proc_dointvec, 6394 6395 }, 6396 { 6397 .procname = "seg6_enabled", 6398 .data = &ipv6_devconf.seg6_enabled, 6399 .maxlen = sizeof(int), 6400 .mode = 0644, 6401 .proc_handler = proc_dointvec, 6402 }, 6403 #ifdef CONFIG_IPV6_SEG6_HMAC 6404 { 6405 .procname = "seg6_require_hmac", 6406 .data = &ipv6_devconf.seg6_require_hmac, 6407 .maxlen = sizeof(int), 6408 .mode = 0644, 6409 .proc_handler = proc_dointvec, 6410 }, 6411 #endif 6412 { 6413 .procname = "enhanced_dad", 6414 .data = &ipv6_devconf.enhanced_dad, 6415 .maxlen = sizeof(int), 6416 .mode = 0644, 6417 .proc_handler = proc_dointvec, 6418 }, 6419 { 6420 .procname = "addr_gen_mode", 6421 .data = &ipv6_devconf.addr_gen_mode, 6422 .maxlen = sizeof(int), 6423 .mode = 0644, 6424 .proc_handler = addrconf_sysctl_addr_gen_mode, 6425 }, 6426 { 6427 .procname = "disable_policy", 6428 .data = &ipv6_devconf.disable_policy, 6429 .maxlen = sizeof(int), 6430 .mode = 0644, 6431 .proc_handler = addrconf_sysctl_disable_policy, 6432 }, 6433 { 6434 .procname = "ndisc_tclass", 6435 .data = &ipv6_devconf.ndisc_tclass, 6436 .maxlen = sizeof(int), 6437 .mode = 0644, 6438 .proc_handler = proc_dointvec_minmax, 6439 .extra1 = (void *)&zero, 6440 .extra2 = (void *)&two_five_five, 6441 }, 6442 { 6443 /* sentinel */ 6444 } 6445 }; 6446 6447 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 6448 struct inet6_dev *idev, struct ipv6_devconf *p) 6449 { 6450 int i, ifindex; 6451 struct ctl_table *table; 6452 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 6453 6454 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 6455 if (!table) 6456 goto out; 6457 6458 for (i = 0; table[i].data; i++) { 6459 table[i].data += (char *)p - (char *)&ipv6_devconf; 6460 /* If one of these is already set, then it is not safe to 6461 * overwrite either of them: this makes proc_dointvec_minmax 6462 * usable. 6463 */ 6464 if (!table[i].extra1 && !table[i].extra2) { 6465 table[i].extra1 = idev; /* embedded; no ref */ 6466 table[i].extra2 = net; 6467 } 6468 } 6469 6470 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 6471 6472 p->sysctl_header = register_net_sysctl(net, path, table); 6473 if (!p->sysctl_header) 6474 goto free; 6475 6476 if (!strcmp(dev_name, "all")) 6477 ifindex = NETCONFA_IFINDEX_ALL; 6478 else if (!strcmp(dev_name, "default")) 6479 ifindex = NETCONFA_IFINDEX_DEFAULT; 6480 else 6481 ifindex = idev->dev->ifindex; 6482 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 6483 ifindex, p); 6484 return 0; 6485 6486 free: 6487 kfree(table); 6488 out: 6489 return -ENOBUFS; 6490 } 6491 6492 static void __addrconf_sysctl_unregister(struct net *net, 6493 struct ipv6_devconf *p, int ifindex) 6494 { 6495 struct ctl_table *table; 6496 6497 if (!p->sysctl_header) 6498 return; 6499 6500 table = p->sysctl_header->ctl_table_arg; 6501 unregister_net_sysctl_table(p->sysctl_header); 6502 p->sysctl_header = NULL; 6503 kfree(table); 6504 6505 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 6506 } 6507 6508 static int addrconf_sysctl_register(struct inet6_dev *idev) 6509 { 6510 int err; 6511 6512 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 6513 return -EINVAL; 6514 6515 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 6516 &ndisc_ifinfo_sysctl_change); 6517 if (err) 6518 return err; 6519 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 6520 idev, &idev->cnf); 6521 if (err) 6522 neigh_sysctl_unregister(idev->nd_parms); 6523 6524 return err; 6525 } 6526 6527 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 6528 { 6529 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 6530 idev->dev->ifindex); 6531 neigh_sysctl_unregister(idev->nd_parms); 6532 } 6533 6534 6535 #endif 6536 6537 static int __net_init addrconf_init_net(struct net *net) 6538 { 6539 int err = -ENOMEM; 6540 struct ipv6_devconf *all, *dflt; 6541 6542 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 6543 if (!all) 6544 goto err_alloc_all; 6545 6546 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 6547 if (!dflt) 6548 goto err_alloc_dflt; 6549 6550 /* these will be inherited by all namespaces */ 6551 dflt->autoconf = ipv6_defaults.autoconf; 6552 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 6553 6554 dflt->stable_secret.initialized = false; 6555 all->stable_secret.initialized = false; 6556 6557 net->ipv6.devconf_all = all; 6558 net->ipv6.devconf_dflt = dflt; 6559 6560 #ifdef CONFIG_SYSCTL 6561 err = __addrconf_sysctl_register(net, "all", NULL, all); 6562 if (err < 0) 6563 goto err_reg_all; 6564 6565 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 6566 if (err < 0) 6567 goto err_reg_dflt; 6568 #endif 6569 return 0; 6570 6571 #ifdef CONFIG_SYSCTL 6572 err_reg_dflt: 6573 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 6574 err_reg_all: 6575 kfree(dflt); 6576 #endif 6577 err_alloc_dflt: 6578 kfree(all); 6579 err_alloc_all: 6580 return err; 6581 } 6582 6583 static void __net_exit addrconf_exit_net(struct net *net) 6584 { 6585 #ifdef CONFIG_SYSCTL 6586 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 6587 NETCONFA_IFINDEX_DEFAULT); 6588 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 6589 NETCONFA_IFINDEX_ALL); 6590 #endif 6591 kfree(net->ipv6.devconf_dflt); 6592 kfree(net->ipv6.devconf_all); 6593 } 6594 6595 static struct pernet_operations addrconf_ops = { 6596 .init = addrconf_init_net, 6597 .exit = addrconf_exit_net, 6598 }; 6599 6600 static struct rtnl_af_ops inet6_ops __read_mostly = { 6601 .family = AF_INET6, 6602 .fill_link_af = inet6_fill_link_af, 6603 .get_link_af_size = inet6_get_link_af_size, 6604 .validate_link_af = inet6_validate_link_af, 6605 .set_link_af = inet6_set_link_af, 6606 }; 6607 6608 /* 6609 * Init / cleanup code 6610 */ 6611 6612 int __init addrconf_init(void) 6613 { 6614 struct inet6_dev *idev; 6615 int i, err; 6616 6617 err = ipv6_addr_label_init(); 6618 if (err < 0) { 6619 pr_crit("%s: cannot initialize default policy table: %d\n", 6620 __func__, err); 6621 goto out; 6622 } 6623 6624 err = register_pernet_subsys(&addrconf_ops); 6625 if (err < 0) 6626 goto out_addrlabel; 6627 6628 addrconf_wq = create_workqueue("ipv6_addrconf"); 6629 if (!addrconf_wq) { 6630 err = -ENOMEM; 6631 goto out_nowq; 6632 } 6633 6634 /* The addrconf netdev notifier requires that loopback_dev 6635 * has it's ipv6 private information allocated and setup 6636 * before it can bring up and give link-local addresses 6637 * to other devices which are up. 6638 * 6639 * Unfortunately, loopback_dev is not necessarily the first 6640 * entry in the global dev_base list of net devices. In fact, 6641 * it is likely to be the very last entry on that list. 6642 * So this causes the notifier registry below to try and 6643 * give link-local addresses to all devices besides loopback_dev 6644 * first, then loopback_dev, which cases all the non-loopback_dev 6645 * devices to fail to get a link-local address. 6646 * 6647 * So, as a temporary fix, allocate the ipv6 structure for 6648 * loopback_dev first by hand. 6649 * Longer term, all of the dependencies ipv6 has upon the loopback 6650 * device and it being up should be removed. 6651 */ 6652 rtnl_lock(); 6653 idev = ipv6_add_dev(init_net.loopback_dev); 6654 rtnl_unlock(); 6655 if (IS_ERR(idev)) { 6656 err = PTR_ERR(idev); 6657 goto errlo; 6658 } 6659 6660 ip6_route_init_special_entries(); 6661 6662 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6663 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 6664 6665 register_netdevice_notifier(&ipv6_dev_notf); 6666 6667 addrconf_verify(); 6668 6669 rtnl_af_register(&inet6_ops); 6670 6671 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK, 6672 NULL, inet6_dump_ifinfo, 0); 6673 if (err < 0) 6674 goto errout; 6675 6676 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR, 6677 inet6_rtm_newaddr, NULL, 0); 6678 if (err < 0) 6679 goto errout; 6680 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR, 6681 inet6_rtm_deladdr, NULL, 0); 6682 if (err < 0) 6683 goto errout; 6684 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR, 6685 inet6_rtm_getaddr, inet6_dump_ifaddr, 6686 RTNL_FLAG_DOIT_UNLOCKED); 6687 if (err < 0) 6688 goto errout; 6689 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST, 6690 NULL, inet6_dump_ifmcaddr, 0); 6691 if (err < 0) 6692 goto errout; 6693 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST, 6694 NULL, inet6_dump_ifacaddr, 0); 6695 if (err < 0) 6696 goto errout; 6697 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF, 6698 inet6_netconf_get_devconf, 6699 inet6_netconf_dump_devconf, 6700 RTNL_FLAG_DOIT_UNLOCKED); 6701 if (err < 0) 6702 goto errout; 6703 err = ipv6_addr_label_rtnl_register(); 6704 if (err < 0) 6705 goto errout; 6706 6707 return 0; 6708 errout: 6709 rtnl_unregister_all(PF_INET6); 6710 rtnl_af_unregister(&inet6_ops); 6711 unregister_netdevice_notifier(&ipv6_dev_notf); 6712 errlo: 6713 destroy_workqueue(addrconf_wq); 6714 out_nowq: 6715 unregister_pernet_subsys(&addrconf_ops); 6716 out_addrlabel: 6717 ipv6_addr_label_cleanup(); 6718 out: 6719 return err; 6720 } 6721 6722 void addrconf_cleanup(void) 6723 { 6724 struct net_device *dev; 6725 int i; 6726 6727 unregister_netdevice_notifier(&ipv6_dev_notf); 6728 unregister_pernet_subsys(&addrconf_ops); 6729 ipv6_addr_label_cleanup(); 6730 6731 rtnl_af_unregister(&inet6_ops); 6732 6733 rtnl_lock(); 6734 6735 /* clean dev list */ 6736 for_each_netdev(&init_net, dev) { 6737 if (__in6_dev_get(dev) == NULL) 6738 continue; 6739 addrconf_ifdown(dev, 1); 6740 } 6741 addrconf_ifdown(init_net.loopback_dev, 2); 6742 6743 /* 6744 * Check hash table. 6745 */ 6746 spin_lock_bh(&addrconf_hash_lock); 6747 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6748 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 6749 spin_unlock_bh(&addrconf_hash_lock); 6750 cancel_delayed_work(&addr_chk_work); 6751 rtnl_unlock(); 6752 6753 destroy_workqueue(addrconf_wq); 6754 } 6755