1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * IPv6 Address [auto]configuration 4 * Linux INET6 implementation 5 * 6 * Authors: 7 * Pedro Roque <roque@di.fc.ul.pt> 8 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 9 */ 10 11 /* 12 * Changes: 13 * 14 * Janos Farkas : delete timer on ifdown 15 * <chexum@bankinf.banki.hu> 16 * Andi Kleen : kill double kfree on module 17 * unload. 18 * Maciej W. Rozycki : FDDI support 19 * sekiya@USAGI : Don't send too many RS 20 * packets. 21 * yoshfuji@USAGI : Fixed interval between DAD 22 * packets. 23 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 24 * address validation timer. 25 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 26 * support. 27 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 28 * address on a same interface. 29 * YOSHIFUJI Hideaki @USAGI : ARCnet support 30 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 31 * seq_file. 32 * YOSHIFUJI Hideaki @USAGI : improved source address 33 * selection; consider scope, 34 * status etc. 35 */ 36 37 #define pr_fmt(fmt) "IPv6: " fmt 38 39 #include <linux/errno.h> 40 #include <linux/types.h> 41 #include <linux/kernel.h> 42 #include <linux/sched/signal.h> 43 #include <linux/socket.h> 44 #include <linux/sockios.h> 45 #include <linux/net.h> 46 #include <linux/inet.h> 47 #include <linux/in6.h> 48 #include <linux/netdevice.h> 49 #include <linux/if_addr.h> 50 #include <linux/if_arp.h> 51 #include <linux/if_arcnet.h> 52 #include <linux/if_infiniband.h> 53 #include <linux/route.h> 54 #include <linux/inetdevice.h> 55 #include <linux/init.h> 56 #include <linux/slab.h> 57 #ifdef CONFIG_SYSCTL 58 #include <linux/sysctl.h> 59 #endif 60 #include <linux/capability.h> 61 #include <linux/delay.h> 62 #include <linux/notifier.h> 63 #include <linux/string.h> 64 #include <linux/hash.h> 65 66 #include <net/net_namespace.h> 67 #include <net/sock.h> 68 #include <net/snmp.h> 69 70 #include <net/6lowpan.h> 71 #include <net/firewire.h> 72 #include <net/ipv6.h> 73 #include <net/protocol.h> 74 #include <net/ndisc.h> 75 #include <net/ip6_route.h> 76 #include <net/addrconf.h> 77 #include <net/tcp.h> 78 #include <net/ip.h> 79 #include <net/netlink.h> 80 #include <net/pkt_sched.h> 81 #include <net/l3mdev.h> 82 #include <linux/if_tunnel.h> 83 #include <linux/rtnetlink.h> 84 #include <linux/netconf.h> 85 #include <linux/random.h> 86 #include <linux/uaccess.h> 87 #include <asm/unaligned.h> 88 89 #include <linux/proc_fs.h> 90 #include <linux/seq_file.h> 91 #include <linux/export.h> 92 #include <linux/ioam6.h> 93 94 #define INFINITY_LIFE_TIME 0xFFFFFFFF 95 96 #define IPV6_MAX_STRLEN \ 97 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") 98 99 static inline u32 cstamp_delta(unsigned long cstamp) 100 { 101 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 102 } 103 104 static inline s32 rfc3315_s14_backoff_init(s32 irt) 105 { 106 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */ 107 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt; 108 do_div(tmp, 1000000); 109 return (s32)tmp; 110 } 111 112 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt) 113 { 114 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */ 115 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt; 116 do_div(tmp, 1000000); 117 if ((s32)tmp > mrt) { 118 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */ 119 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt; 120 do_div(tmp, 1000000); 121 } 122 return (s32)tmp; 123 } 124 125 #ifdef CONFIG_SYSCTL 126 static int addrconf_sysctl_register(struct inet6_dev *idev); 127 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 128 #else 129 static inline int addrconf_sysctl_register(struct inet6_dev *idev) 130 { 131 return 0; 132 } 133 134 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 135 { 136 } 137 #endif 138 139 static void ipv6_gen_rnd_iid(struct in6_addr *addr); 140 141 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 142 static int ipv6_count_addresses(const struct inet6_dev *idev); 143 static int ipv6_generate_stable_address(struct in6_addr *addr, 144 u8 dad_count, 145 const struct inet6_dev *idev); 146 147 #define IN6_ADDR_HSIZE_SHIFT 8 148 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT) 149 /* 150 * Configured unicast address hash table 151 */ 152 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 153 static DEFINE_SPINLOCK(addrconf_hash_lock); 154 155 static void addrconf_verify(void); 156 static void addrconf_verify_rtnl(void); 157 static void addrconf_verify_work(struct work_struct *); 158 159 static struct workqueue_struct *addrconf_wq; 160 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work); 161 162 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 163 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 164 165 static void addrconf_type_change(struct net_device *dev, 166 unsigned long event); 167 static int addrconf_ifdown(struct net_device *dev, bool unregister); 168 169 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 170 int plen, 171 const struct net_device *dev, 172 u32 flags, u32 noflags, 173 bool no_gw); 174 175 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 176 static void addrconf_dad_work(struct work_struct *w); 177 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 178 bool send_na); 179 static void addrconf_dad_run(struct inet6_dev *idev, bool restart); 180 static void addrconf_rs_timer(struct timer_list *t); 181 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 182 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 183 184 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 185 struct prefix_info *pinfo); 186 187 static struct ipv6_devconf ipv6_devconf __read_mostly = { 188 .forwarding = 0, 189 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 190 .mtu6 = IPV6_MIN_MTU, 191 .accept_ra = 1, 192 .accept_redirects = 1, 193 .autoconf = 1, 194 .force_mld_version = 0, 195 .mldv1_unsolicited_report_interval = 10 * HZ, 196 .mldv2_unsolicited_report_interval = HZ, 197 .dad_transmits = 1, 198 .rtr_solicits = MAX_RTR_SOLICITATIONS, 199 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 200 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 201 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 202 .use_tempaddr = 0, 203 .temp_valid_lft = TEMP_VALID_LIFETIME, 204 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 205 .regen_max_retry = REGEN_MAX_RETRY, 206 .max_desync_factor = MAX_DESYNC_FACTOR, 207 .max_addresses = IPV6_MAX_ADDRESSES, 208 .accept_ra_defrtr = 1, 209 .ra_defrtr_metric = IP6_RT_PRIO_USER, 210 .accept_ra_from_local = 0, 211 .accept_ra_min_hop_limit= 1, 212 .accept_ra_pinfo = 1, 213 #ifdef CONFIG_IPV6_ROUTER_PREF 214 .accept_ra_rtr_pref = 1, 215 .rtr_probe_interval = 60 * HZ, 216 #ifdef CONFIG_IPV6_ROUTE_INFO 217 .accept_ra_rt_info_min_plen = 0, 218 .accept_ra_rt_info_max_plen = 0, 219 #endif 220 #endif 221 .proxy_ndp = 0, 222 .accept_source_route = 0, /* we do not accept RH0 by default. */ 223 .disable_ipv6 = 0, 224 .accept_dad = 0, 225 .suppress_frag_ndisc = 1, 226 .accept_ra_mtu = 1, 227 .stable_secret = { 228 .initialized = false, 229 }, 230 .use_oif_addrs_only = 0, 231 .ignore_routes_with_linkdown = 0, 232 .keep_addr_on_down = 0, 233 .seg6_enabled = 0, 234 #ifdef CONFIG_IPV6_SEG6_HMAC 235 .seg6_require_hmac = 0, 236 #endif 237 .enhanced_dad = 1, 238 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 239 .disable_policy = 0, 240 .rpl_seg_enabled = 0, 241 .ioam6_enabled = 0, 242 .ioam6_id = IOAM6_DEFAULT_IF_ID, 243 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE, 244 }; 245 246 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 247 .forwarding = 0, 248 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 249 .mtu6 = IPV6_MIN_MTU, 250 .accept_ra = 1, 251 .accept_redirects = 1, 252 .autoconf = 1, 253 .force_mld_version = 0, 254 .mldv1_unsolicited_report_interval = 10 * HZ, 255 .mldv2_unsolicited_report_interval = HZ, 256 .dad_transmits = 1, 257 .rtr_solicits = MAX_RTR_SOLICITATIONS, 258 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 259 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 260 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 261 .use_tempaddr = 0, 262 .temp_valid_lft = TEMP_VALID_LIFETIME, 263 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 264 .regen_max_retry = REGEN_MAX_RETRY, 265 .max_desync_factor = MAX_DESYNC_FACTOR, 266 .max_addresses = IPV6_MAX_ADDRESSES, 267 .accept_ra_defrtr = 1, 268 .ra_defrtr_metric = IP6_RT_PRIO_USER, 269 .accept_ra_from_local = 0, 270 .accept_ra_min_hop_limit= 1, 271 .accept_ra_pinfo = 1, 272 #ifdef CONFIG_IPV6_ROUTER_PREF 273 .accept_ra_rtr_pref = 1, 274 .rtr_probe_interval = 60 * HZ, 275 #ifdef CONFIG_IPV6_ROUTE_INFO 276 .accept_ra_rt_info_min_plen = 0, 277 .accept_ra_rt_info_max_plen = 0, 278 #endif 279 #endif 280 .proxy_ndp = 0, 281 .accept_source_route = 0, /* we do not accept RH0 by default. */ 282 .disable_ipv6 = 0, 283 .accept_dad = 1, 284 .suppress_frag_ndisc = 1, 285 .accept_ra_mtu = 1, 286 .stable_secret = { 287 .initialized = false, 288 }, 289 .use_oif_addrs_only = 0, 290 .ignore_routes_with_linkdown = 0, 291 .keep_addr_on_down = 0, 292 .seg6_enabled = 0, 293 #ifdef CONFIG_IPV6_SEG6_HMAC 294 .seg6_require_hmac = 0, 295 #endif 296 .enhanced_dad = 1, 297 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 298 .disable_policy = 0, 299 .rpl_seg_enabled = 0, 300 .ioam6_enabled = 0, 301 .ioam6_id = IOAM6_DEFAULT_IF_ID, 302 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE, 303 }; 304 305 /* Check if link is ready: is it up and is a valid qdisc available */ 306 static inline bool addrconf_link_ready(const struct net_device *dev) 307 { 308 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev); 309 } 310 311 static void addrconf_del_rs_timer(struct inet6_dev *idev) 312 { 313 if (del_timer(&idev->rs_timer)) 314 __in6_dev_put(idev); 315 } 316 317 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 318 { 319 if (cancel_delayed_work(&ifp->dad_work)) 320 __in6_ifa_put(ifp); 321 } 322 323 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 324 unsigned long when) 325 { 326 if (!timer_pending(&idev->rs_timer)) 327 in6_dev_hold(idev); 328 mod_timer(&idev->rs_timer, jiffies + when); 329 } 330 331 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 332 unsigned long delay) 333 { 334 in6_ifa_hold(ifp); 335 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay)) 336 in6_ifa_put(ifp); 337 } 338 339 static int snmp6_alloc_dev(struct inet6_dev *idev) 340 { 341 int i; 342 343 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib); 344 if (!idev->stats.ipv6) 345 goto err_ip; 346 347 for_each_possible_cpu(i) { 348 struct ipstats_mib *addrconf_stats; 349 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 350 u64_stats_init(&addrconf_stats->syncp); 351 } 352 353 354 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 355 GFP_KERNEL); 356 if (!idev->stats.icmpv6dev) 357 goto err_icmp; 358 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 359 GFP_KERNEL); 360 if (!idev->stats.icmpv6msgdev) 361 goto err_icmpmsg; 362 363 return 0; 364 365 err_icmpmsg: 366 kfree(idev->stats.icmpv6dev); 367 err_icmp: 368 free_percpu(idev->stats.ipv6); 369 err_ip: 370 return -ENOMEM; 371 } 372 373 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 374 { 375 struct inet6_dev *ndev; 376 int err = -ENOMEM; 377 378 ASSERT_RTNL(); 379 380 if (dev->mtu < IPV6_MIN_MTU) 381 return ERR_PTR(-EINVAL); 382 383 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 384 if (!ndev) 385 return ERR_PTR(err); 386 387 rwlock_init(&ndev->lock); 388 ndev->dev = dev; 389 INIT_LIST_HEAD(&ndev->addr_list); 390 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0); 391 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 392 393 if (ndev->cnf.stable_secret.initialized) 394 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 395 396 ndev->cnf.mtu6 = dev->mtu; 397 ndev->ra_mtu = 0; 398 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 399 if (!ndev->nd_parms) { 400 kfree(ndev); 401 return ERR_PTR(err); 402 } 403 if (ndev->cnf.forwarding) 404 dev_disable_lro(dev); 405 /* We refer to the device */ 406 dev_hold(dev); 407 408 if (snmp6_alloc_dev(ndev) < 0) { 409 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n", 410 __func__); 411 neigh_parms_release(&nd_tbl, ndev->nd_parms); 412 dev_put(dev); 413 kfree(ndev); 414 return ERR_PTR(err); 415 } 416 417 if (snmp6_register_dev(ndev) < 0) { 418 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n", 419 __func__, dev->name); 420 goto err_release; 421 } 422 423 /* One reference from device. */ 424 refcount_set(&ndev->refcnt, 1); 425 426 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 427 ndev->cnf.accept_dad = -1; 428 429 #if IS_ENABLED(CONFIG_IPV6_SIT) 430 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 431 pr_info("%s: Disabled Multicast RS\n", dev->name); 432 ndev->cnf.rtr_solicits = 0; 433 } 434 #endif 435 436 INIT_LIST_HEAD(&ndev->tempaddr_list); 437 ndev->desync_factor = U32_MAX; 438 if ((dev->flags&IFF_LOOPBACK) || 439 dev->type == ARPHRD_TUNNEL || 440 dev->type == ARPHRD_TUNNEL6 || 441 dev->type == ARPHRD_SIT || 442 dev->type == ARPHRD_NONE) { 443 ndev->cnf.use_tempaddr = -1; 444 } 445 446 ndev->token = in6addr_any; 447 448 if (netif_running(dev) && addrconf_link_ready(dev)) 449 ndev->if_flags |= IF_READY; 450 451 ipv6_mc_init_dev(ndev); 452 ndev->tstamp = jiffies; 453 err = addrconf_sysctl_register(ndev); 454 if (err) { 455 ipv6_mc_destroy_dev(ndev); 456 snmp6_unregister_dev(ndev); 457 goto err_release; 458 } 459 /* protected by rtnl_lock */ 460 rcu_assign_pointer(dev->ip6_ptr, ndev); 461 462 /* Join interface-local all-node multicast group */ 463 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 464 465 /* Join all-node multicast group */ 466 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 467 468 /* Join all-router multicast group if forwarding is set */ 469 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 470 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 471 472 return ndev; 473 474 err_release: 475 neigh_parms_release(&nd_tbl, ndev->nd_parms); 476 ndev->dead = 1; 477 in6_dev_finish_destroy(ndev); 478 return ERR_PTR(err); 479 } 480 481 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 482 { 483 struct inet6_dev *idev; 484 485 ASSERT_RTNL(); 486 487 idev = __in6_dev_get(dev); 488 if (!idev) { 489 idev = ipv6_add_dev(dev); 490 if (IS_ERR(idev)) 491 return idev; 492 } 493 494 if (dev->flags&IFF_UP) 495 ipv6_mc_up(idev); 496 return idev; 497 } 498 499 static int inet6_netconf_msgsize_devconf(int type) 500 { 501 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 502 + nla_total_size(4); /* NETCONFA_IFINDEX */ 503 bool all = false; 504 505 if (type == NETCONFA_ALL) 506 all = true; 507 508 if (all || type == NETCONFA_FORWARDING) 509 size += nla_total_size(4); 510 #ifdef CONFIG_IPV6_MROUTE 511 if (all || type == NETCONFA_MC_FORWARDING) 512 size += nla_total_size(4); 513 #endif 514 if (all || type == NETCONFA_PROXY_NEIGH) 515 size += nla_total_size(4); 516 517 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 518 size += nla_total_size(4); 519 520 return size; 521 } 522 523 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 524 struct ipv6_devconf *devconf, u32 portid, 525 u32 seq, int event, unsigned int flags, 526 int type) 527 { 528 struct nlmsghdr *nlh; 529 struct netconfmsg *ncm; 530 bool all = false; 531 532 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 533 flags); 534 if (!nlh) 535 return -EMSGSIZE; 536 537 if (type == NETCONFA_ALL) 538 all = true; 539 540 ncm = nlmsg_data(nlh); 541 ncm->ncm_family = AF_INET6; 542 543 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 544 goto nla_put_failure; 545 546 if (!devconf) 547 goto out; 548 549 if ((all || type == NETCONFA_FORWARDING) && 550 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 551 goto nla_put_failure; 552 #ifdef CONFIG_IPV6_MROUTE 553 if ((all || type == NETCONFA_MC_FORWARDING) && 554 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 555 devconf->mc_forwarding) < 0) 556 goto nla_put_failure; 557 #endif 558 if ((all || type == NETCONFA_PROXY_NEIGH) && 559 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 560 goto nla_put_failure; 561 562 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 563 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 564 devconf->ignore_routes_with_linkdown) < 0) 565 goto nla_put_failure; 566 567 out: 568 nlmsg_end(skb, nlh); 569 return 0; 570 571 nla_put_failure: 572 nlmsg_cancel(skb, nlh); 573 return -EMSGSIZE; 574 } 575 576 void inet6_netconf_notify_devconf(struct net *net, int event, int type, 577 int ifindex, struct ipv6_devconf *devconf) 578 { 579 struct sk_buff *skb; 580 int err = -ENOBUFS; 581 582 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL); 583 if (!skb) 584 goto errout; 585 586 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 587 event, 0, type); 588 if (err < 0) { 589 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 590 WARN_ON(err == -EMSGSIZE); 591 kfree_skb(skb); 592 goto errout; 593 } 594 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL); 595 return; 596 errout: 597 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 598 } 599 600 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 601 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 602 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 603 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 604 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 605 }; 606 607 static int inet6_netconf_valid_get_req(struct sk_buff *skb, 608 const struct nlmsghdr *nlh, 609 struct nlattr **tb, 610 struct netlink_ext_ack *extack) 611 { 612 int i, err; 613 614 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) { 615 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request"); 616 return -EINVAL; 617 } 618 619 if (!netlink_strict_get_check(skb)) 620 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg), 621 tb, NETCONFA_MAX, 622 devconf_ipv6_policy, extack); 623 624 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg), 625 tb, NETCONFA_MAX, 626 devconf_ipv6_policy, extack); 627 if (err) 628 return err; 629 630 for (i = 0; i <= NETCONFA_MAX; i++) { 631 if (!tb[i]) 632 continue; 633 634 switch (i) { 635 case NETCONFA_IFINDEX: 636 break; 637 default: 638 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request"); 639 return -EINVAL; 640 } 641 } 642 643 return 0; 644 } 645 646 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 647 struct nlmsghdr *nlh, 648 struct netlink_ext_ack *extack) 649 { 650 struct net *net = sock_net(in_skb->sk); 651 struct nlattr *tb[NETCONFA_MAX+1]; 652 struct inet6_dev *in6_dev = NULL; 653 struct net_device *dev = NULL; 654 struct sk_buff *skb; 655 struct ipv6_devconf *devconf; 656 int ifindex; 657 int err; 658 659 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack); 660 if (err < 0) 661 return err; 662 663 if (!tb[NETCONFA_IFINDEX]) 664 return -EINVAL; 665 666 err = -EINVAL; 667 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 668 switch (ifindex) { 669 case NETCONFA_IFINDEX_ALL: 670 devconf = net->ipv6.devconf_all; 671 break; 672 case NETCONFA_IFINDEX_DEFAULT: 673 devconf = net->ipv6.devconf_dflt; 674 break; 675 default: 676 dev = dev_get_by_index(net, ifindex); 677 if (!dev) 678 return -EINVAL; 679 in6_dev = in6_dev_get(dev); 680 if (!in6_dev) 681 goto errout; 682 devconf = &in6_dev->cnf; 683 break; 684 } 685 686 err = -ENOBUFS; 687 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); 688 if (!skb) 689 goto errout; 690 691 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 692 NETLINK_CB(in_skb).portid, 693 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 694 NETCONFA_ALL); 695 if (err < 0) { 696 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 697 WARN_ON(err == -EMSGSIZE); 698 kfree_skb(skb); 699 goto errout; 700 } 701 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 702 errout: 703 if (in6_dev) 704 in6_dev_put(in6_dev); 705 dev_put(dev); 706 return err; 707 } 708 709 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 710 struct netlink_callback *cb) 711 { 712 const struct nlmsghdr *nlh = cb->nlh; 713 struct net *net = sock_net(skb->sk); 714 int h, s_h; 715 int idx, s_idx; 716 struct net_device *dev; 717 struct inet6_dev *idev; 718 struct hlist_head *head; 719 720 if (cb->strict_check) { 721 struct netlink_ext_ack *extack = cb->extack; 722 struct netconfmsg *ncm; 723 724 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) { 725 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request"); 726 return -EINVAL; 727 } 728 729 if (nlmsg_attrlen(nlh, sizeof(*ncm))) { 730 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request"); 731 return -EINVAL; 732 } 733 } 734 735 s_h = cb->args[0]; 736 s_idx = idx = cb->args[1]; 737 738 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 739 idx = 0; 740 head = &net->dev_index_head[h]; 741 rcu_read_lock(); 742 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 743 net->dev_base_seq; 744 hlist_for_each_entry_rcu(dev, head, index_hlist) { 745 if (idx < s_idx) 746 goto cont; 747 idev = __in6_dev_get(dev); 748 if (!idev) 749 goto cont; 750 751 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 752 &idev->cnf, 753 NETLINK_CB(cb->skb).portid, 754 nlh->nlmsg_seq, 755 RTM_NEWNETCONF, 756 NLM_F_MULTI, 757 NETCONFA_ALL) < 0) { 758 rcu_read_unlock(); 759 goto done; 760 } 761 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 762 cont: 763 idx++; 764 } 765 rcu_read_unlock(); 766 } 767 if (h == NETDEV_HASHENTRIES) { 768 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 769 net->ipv6.devconf_all, 770 NETLINK_CB(cb->skb).portid, 771 nlh->nlmsg_seq, 772 RTM_NEWNETCONF, NLM_F_MULTI, 773 NETCONFA_ALL) < 0) 774 goto done; 775 else 776 h++; 777 } 778 if (h == NETDEV_HASHENTRIES + 1) { 779 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 780 net->ipv6.devconf_dflt, 781 NETLINK_CB(cb->skb).portid, 782 nlh->nlmsg_seq, 783 RTM_NEWNETCONF, NLM_F_MULTI, 784 NETCONFA_ALL) < 0) 785 goto done; 786 else 787 h++; 788 } 789 done: 790 cb->args[0] = h; 791 cb->args[1] = idx; 792 793 return skb->len; 794 } 795 796 #ifdef CONFIG_SYSCTL 797 static void dev_forward_change(struct inet6_dev *idev) 798 { 799 struct net_device *dev; 800 struct inet6_ifaddr *ifa; 801 802 if (!idev) 803 return; 804 dev = idev->dev; 805 if (idev->cnf.forwarding) 806 dev_disable_lro(dev); 807 if (dev->flags & IFF_MULTICAST) { 808 if (idev->cnf.forwarding) { 809 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 810 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 811 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 812 } else { 813 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 814 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 815 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 816 } 817 } 818 819 list_for_each_entry(ifa, &idev->addr_list, if_list) { 820 if (ifa->flags&IFA_F_TENTATIVE) 821 continue; 822 if (idev->cnf.forwarding) 823 addrconf_join_anycast(ifa); 824 else 825 addrconf_leave_anycast(ifa); 826 } 827 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, 828 NETCONFA_FORWARDING, 829 dev->ifindex, &idev->cnf); 830 } 831 832 833 static void addrconf_forward_change(struct net *net, __s32 newf) 834 { 835 struct net_device *dev; 836 struct inet6_dev *idev; 837 838 for_each_netdev(net, dev) { 839 idev = __in6_dev_get(dev); 840 if (idev) { 841 int changed = (!idev->cnf.forwarding) ^ (!newf); 842 idev->cnf.forwarding = newf; 843 if (changed) 844 dev_forward_change(idev); 845 } 846 } 847 } 848 849 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 850 { 851 struct net *net; 852 int old; 853 854 if (!rtnl_trylock()) 855 return restart_syscall(); 856 857 net = (struct net *)table->extra2; 858 old = *p; 859 *p = newf; 860 861 if (p == &net->ipv6.devconf_dflt->forwarding) { 862 if ((!newf) ^ (!old)) 863 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 864 NETCONFA_FORWARDING, 865 NETCONFA_IFINDEX_DEFAULT, 866 net->ipv6.devconf_dflt); 867 rtnl_unlock(); 868 return 0; 869 } 870 871 if (p == &net->ipv6.devconf_all->forwarding) { 872 int old_dflt = net->ipv6.devconf_dflt->forwarding; 873 874 net->ipv6.devconf_dflt->forwarding = newf; 875 if ((!newf) ^ (!old_dflt)) 876 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 877 NETCONFA_FORWARDING, 878 NETCONFA_IFINDEX_DEFAULT, 879 net->ipv6.devconf_dflt); 880 881 addrconf_forward_change(net, newf); 882 if ((!newf) ^ (!old)) 883 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 884 NETCONFA_FORWARDING, 885 NETCONFA_IFINDEX_ALL, 886 net->ipv6.devconf_all); 887 } else if ((!newf) ^ (!old)) 888 dev_forward_change((struct inet6_dev *)table->extra1); 889 rtnl_unlock(); 890 891 if (newf) 892 rt6_purge_dflt_routers(net); 893 return 1; 894 } 895 896 static void addrconf_linkdown_change(struct net *net, __s32 newf) 897 { 898 struct net_device *dev; 899 struct inet6_dev *idev; 900 901 for_each_netdev(net, dev) { 902 idev = __in6_dev_get(dev); 903 if (idev) { 904 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 905 906 idev->cnf.ignore_routes_with_linkdown = newf; 907 if (changed) 908 inet6_netconf_notify_devconf(dev_net(dev), 909 RTM_NEWNETCONF, 910 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 911 dev->ifindex, 912 &idev->cnf); 913 } 914 } 915 } 916 917 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 918 { 919 struct net *net; 920 int old; 921 922 if (!rtnl_trylock()) 923 return restart_syscall(); 924 925 net = (struct net *)table->extra2; 926 old = *p; 927 *p = newf; 928 929 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 930 if ((!newf) ^ (!old)) 931 inet6_netconf_notify_devconf(net, 932 RTM_NEWNETCONF, 933 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 934 NETCONFA_IFINDEX_DEFAULT, 935 net->ipv6.devconf_dflt); 936 rtnl_unlock(); 937 return 0; 938 } 939 940 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 941 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 942 addrconf_linkdown_change(net, newf); 943 if ((!newf) ^ (!old)) 944 inet6_netconf_notify_devconf(net, 945 RTM_NEWNETCONF, 946 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 947 NETCONFA_IFINDEX_ALL, 948 net->ipv6.devconf_all); 949 } 950 rtnl_unlock(); 951 952 return 1; 953 } 954 955 #endif 956 957 /* Nobody refers to this ifaddr, destroy it */ 958 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 959 { 960 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 961 962 #ifdef NET_REFCNT_DEBUG 963 pr_debug("%s\n", __func__); 964 #endif 965 966 in6_dev_put(ifp->idev); 967 968 if (cancel_delayed_work(&ifp->dad_work)) 969 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 970 ifp); 971 972 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 973 pr_warn("Freeing alive inet6 address %p\n", ifp); 974 return; 975 } 976 977 kfree_rcu(ifp, rcu); 978 } 979 980 static void 981 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 982 { 983 struct list_head *p; 984 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 985 986 /* 987 * Each device address list is sorted in order of scope - 988 * global before linklocal. 989 */ 990 list_for_each(p, &idev->addr_list) { 991 struct inet6_ifaddr *ifa 992 = list_entry(p, struct inet6_ifaddr, if_list); 993 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 994 break; 995 } 996 997 list_add_tail_rcu(&ifp->if_list, p); 998 } 999 1000 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr) 1001 { 1002 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net); 1003 1004 return hash_32(val, IN6_ADDR_HSIZE_SHIFT); 1005 } 1006 1007 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1008 struct net_device *dev, unsigned int hash) 1009 { 1010 struct inet6_ifaddr *ifp; 1011 1012 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1013 if (!net_eq(dev_net(ifp->idev->dev), net)) 1014 continue; 1015 if (ipv6_addr_equal(&ifp->addr, addr)) { 1016 if (!dev || ifp->idev->dev == dev) 1017 return true; 1018 } 1019 } 1020 return false; 1021 } 1022 1023 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa) 1024 { 1025 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr); 1026 int err = 0; 1027 1028 spin_lock(&addrconf_hash_lock); 1029 1030 /* Ignore adding duplicate addresses on an interface */ 1031 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) { 1032 netdev_dbg(dev, "ipv6_add_addr: already assigned\n"); 1033 err = -EEXIST; 1034 } else { 1035 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 1036 } 1037 1038 spin_unlock(&addrconf_hash_lock); 1039 1040 return err; 1041 } 1042 1043 /* On success it returns ifp with increased reference count */ 1044 1045 static struct inet6_ifaddr * 1046 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg, 1047 bool can_block, struct netlink_ext_ack *extack) 1048 { 1049 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC; 1050 int addr_type = ipv6_addr_type(cfg->pfx); 1051 struct net *net = dev_net(idev->dev); 1052 struct inet6_ifaddr *ifa = NULL; 1053 struct fib6_info *f6i = NULL; 1054 int err = 0; 1055 1056 if (addr_type == IPV6_ADDR_ANY || 1057 (addr_type & IPV6_ADDR_MULTICAST && 1058 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) || 1059 (!(idev->dev->flags & IFF_LOOPBACK) && 1060 !netif_is_l3_master(idev->dev) && 1061 addr_type & IPV6_ADDR_LOOPBACK)) 1062 return ERR_PTR(-EADDRNOTAVAIL); 1063 1064 if (idev->dead) { 1065 err = -ENODEV; /*XXX*/ 1066 goto out; 1067 } 1068 1069 if (idev->cnf.disable_ipv6) { 1070 err = -EACCES; 1071 goto out; 1072 } 1073 1074 /* validator notifier needs to be blocking; 1075 * do not call in atomic context 1076 */ 1077 if (can_block) { 1078 struct in6_validator_info i6vi = { 1079 .i6vi_addr = *cfg->pfx, 1080 .i6vi_dev = idev, 1081 .extack = extack, 1082 }; 1083 1084 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi); 1085 err = notifier_to_errno(err); 1086 if (err < 0) 1087 goto out; 1088 } 1089 1090 ifa = kzalloc(sizeof(*ifa), gfp_flags | __GFP_ACCOUNT); 1091 if (!ifa) { 1092 err = -ENOBUFS; 1093 goto out; 1094 } 1095 1096 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags); 1097 if (IS_ERR(f6i)) { 1098 err = PTR_ERR(f6i); 1099 f6i = NULL; 1100 goto out; 1101 } 1102 1103 if (net->ipv6.devconf_all->disable_policy || 1104 idev->cnf.disable_policy) 1105 f6i->dst_nopolicy = true; 1106 1107 neigh_parms_data_state_setall(idev->nd_parms); 1108 1109 ifa->addr = *cfg->pfx; 1110 if (cfg->peer_pfx) 1111 ifa->peer_addr = *cfg->peer_pfx; 1112 1113 spin_lock_init(&ifa->lock); 1114 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1115 INIT_HLIST_NODE(&ifa->addr_lst); 1116 ifa->scope = cfg->scope; 1117 ifa->prefix_len = cfg->plen; 1118 ifa->rt_priority = cfg->rt_priority; 1119 ifa->flags = cfg->ifa_flags; 1120 /* No need to add the TENTATIVE flag for addresses with NODAD */ 1121 if (!(cfg->ifa_flags & IFA_F_NODAD)) 1122 ifa->flags |= IFA_F_TENTATIVE; 1123 ifa->valid_lft = cfg->valid_lft; 1124 ifa->prefered_lft = cfg->preferred_lft; 1125 ifa->cstamp = ifa->tstamp = jiffies; 1126 ifa->tokenized = false; 1127 1128 ifa->rt = f6i; 1129 1130 ifa->idev = idev; 1131 in6_dev_hold(idev); 1132 1133 /* For caller */ 1134 refcount_set(&ifa->refcnt, 1); 1135 1136 rcu_read_lock_bh(); 1137 1138 err = ipv6_add_addr_hash(idev->dev, ifa); 1139 if (err < 0) { 1140 rcu_read_unlock_bh(); 1141 goto out; 1142 } 1143 1144 write_lock(&idev->lock); 1145 1146 /* Add to inet6_dev unicast addr list. */ 1147 ipv6_link_dev_addr(idev, ifa); 1148 1149 if (ifa->flags&IFA_F_TEMPORARY) { 1150 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1151 in6_ifa_hold(ifa); 1152 } 1153 1154 in6_ifa_hold(ifa); 1155 write_unlock(&idev->lock); 1156 1157 rcu_read_unlock_bh(); 1158 1159 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1160 out: 1161 if (unlikely(err < 0)) { 1162 fib6_info_release(f6i); 1163 1164 if (ifa) { 1165 if (ifa->idev) 1166 in6_dev_put(ifa->idev); 1167 kfree(ifa); 1168 } 1169 ifa = ERR_PTR(err); 1170 } 1171 1172 return ifa; 1173 } 1174 1175 enum cleanup_prefix_rt_t { 1176 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1177 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1178 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1179 }; 1180 1181 /* 1182 * Check, whether the prefix for ifp would still need a prefix route 1183 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1184 * constants. 1185 * 1186 * 1) we don't purge prefix if address was not permanent. 1187 * prefix is managed by its own lifetime. 1188 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1189 * 3) if there are no addresses, delete prefix. 1190 * 4) if there are still other permanent address(es), 1191 * corresponding prefix is still permanent. 1192 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1193 * don't purge the prefix, assume user space is managing it. 1194 * 6) otherwise, update prefix lifetime to the 1195 * longest valid lifetime among the corresponding 1196 * addresses on the device. 1197 * Note: subsequent RA will update lifetime. 1198 **/ 1199 static enum cleanup_prefix_rt_t 1200 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1201 { 1202 struct inet6_ifaddr *ifa; 1203 struct inet6_dev *idev = ifp->idev; 1204 unsigned long lifetime; 1205 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1206 1207 *expires = jiffies; 1208 1209 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1210 if (ifa == ifp) 1211 continue; 1212 if (ifa->prefix_len != ifp->prefix_len || 1213 !ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1214 ifp->prefix_len)) 1215 continue; 1216 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1217 return CLEANUP_PREFIX_RT_NOP; 1218 1219 action = CLEANUP_PREFIX_RT_EXPIRE; 1220 1221 spin_lock(&ifa->lock); 1222 1223 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1224 /* 1225 * Note: Because this address is 1226 * not permanent, lifetime < 1227 * LONG_MAX / HZ here. 1228 */ 1229 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1230 *expires = ifa->tstamp + lifetime * HZ; 1231 spin_unlock(&ifa->lock); 1232 } 1233 1234 return action; 1235 } 1236 1237 static void 1238 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, 1239 bool del_rt, bool del_peer) 1240 { 1241 struct fib6_info *f6i; 1242 1243 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr, 1244 ifp->prefix_len, 1245 ifp->idev->dev, 0, RTF_DEFAULT, true); 1246 if (f6i) { 1247 if (del_rt) 1248 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 1249 else { 1250 if (!(f6i->fib6_flags & RTF_EXPIRES)) 1251 fib6_set_expires(f6i, expires); 1252 fib6_info_release(f6i); 1253 } 1254 } 1255 } 1256 1257 1258 /* This function wants to get referenced ifp and releases it before return */ 1259 1260 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1261 { 1262 int state; 1263 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1264 unsigned long expires; 1265 1266 ASSERT_RTNL(); 1267 1268 spin_lock_bh(&ifp->lock); 1269 state = ifp->state; 1270 ifp->state = INET6_IFADDR_STATE_DEAD; 1271 spin_unlock_bh(&ifp->lock); 1272 1273 if (state == INET6_IFADDR_STATE_DEAD) 1274 goto out; 1275 1276 spin_lock_bh(&addrconf_hash_lock); 1277 hlist_del_init_rcu(&ifp->addr_lst); 1278 spin_unlock_bh(&addrconf_hash_lock); 1279 1280 write_lock_bh(&ifp->idev->lock); 1281 1282 if (ifp->flags&IFA_F_TEMPORARY) { 1283 list_del(&ifp->tmp_list); 1284 if (ifp->ifpub) { 1285 in6_ifa_put(ifp->ifpub); 1286 ifp->ifpub = NULL; 1287 } 1288 __in6_ifa_put(ifp); 1289 } 1290 1291 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1292 action = check_cleanup_prefix_route(ifp, &expires); 1293 1294 list_del_rcu(&ifp->if_list); 1295 __in6_ifa_put(ifp); 1296 1297 write_unlock_bh(&ifp->idev->lock); 1298 1299 addrconf_del_dad_work(ifp); 1300 1301 ipv6_ifa_notify(RTM_DELADDR, ifp); 1302 1303 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1304 1305 if (action != CLEANUP_PREFIX_RT_NOP) { 1306 cleanup_prefix_route(ifp, expires, 1307 action == CLEANUP_PREFIX_RT_DEL, false); 1308 } 1309 1310 /* clean up prefsrc entries */ 1311 rt6_remove_prefsrc(ifp); 1312 out: 1313 in6_ifa_put(ifp); 1314 } 1315 1316 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block) 1317 { 1318 struct inet6_dev *idev = ifp->idev; 1319 unsigned long tmp_tstamp, age; 1320 unsigned long regen_advance; 1321 unsigned long now = jiffies; 1322 s32 cnf_temp_preferred_lft; 1323 struct inet6_ifaddr *ift; 1324 struct ifa6_config cfg; 1325 long max_desync_factor; 1326 struct in6_addr addr; 1327 int ret = 0; 1328 1329 write_lock_bh(&idev->lock); 1330 1331 retry: 1332 in6_dev_hold(idev); 1333 if (idev->cnf.use_tempaddr <= 0) { 1334 write_unlock_bh(&idev->lock); 1335 pr_info("%s: use_tempaddr is disabled\n", __func__); 1336 in6_dev_put(idev); 1337 ret = -1; 1338 goto out; 1339 } 1340 spin_lock_bh(&ifp->lock); 1341 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1342 idev->cnf.use_tempaddr = -1; /*XXX*/ 1343 spin_unlock_bh(&ifp->lock); 1344 write_unlock_bh(&idev->lock); 1345 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1346 __func__); 1347 in6_dev_put(idev); 1348 ret = -1; 1349 goto out; 1350 } 1351 in6_ifa_hold(ifp); 1352 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1353 ipv6_gen_rnd_iid(&addr); 1354 1355 age = (now - ifp->tstamp) / HZ; 1356 1357 regen_advance = idev->cnf.regen_max_retry * 1358 idev->cnf.dad_transmits * 1359 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 1360 1361 /* recalculate max_desync_factor each time and update 1362 * idev->desync_factor if it's larger 1363 */ 1364 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1365 max_desync_factor = min_t(__u32, 1366 idev->cnf.max_desync_factor, 1367 cnf_temp_preferred_lft - regen_advance); 1368 1369 if (unlikely(idev->desync_factor > max_desync_factor)) { 1370 if (max_desync_factor > 0) { 1371 get_random_bytes(&idev->desync_factor, 1372 sizeof(idev->desync_factor)); 1373 idev->desync_factor %= max_desync_factor; 1374 } else { 1375 idev->desync_factor = 0; 1376 } 1377 } 1378 1379 memset(&cfg, 0, sizeof(cfg)); 1380 cfg.valid_lft = min_t(__u32, ifp->valid_lft, 1381 idev->cnf.temp_valid_lft + age); 1382 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor; 1383 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft); 1384 1385 cfg.plen = ifp->prefix_len; 1386 tmp_tstamp = ifp->tstamp; 1387 spin_unlock_bh(&ifp->lock); 1388 1389 write_unlock_bh(&idev->lock); 1390 1391 /* A temporary address is created only if this calculated Preferred 1392 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1393 * an implementation must not create a temporary address with a zero 1394 * Preferred Lifetime. 1395 * Use age calculation as in addrconf_verify to avoid unnecessary 1396 * temporary addresses being generated. 1397 */ 1398 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1399 if (cfg.preferred_lft <= regen_advance + age) { 1400 in6_ifa_put(ifp); 1401 in6_dev_put(idev); 1402 ret = -1; 1403 goto out; 1404 } 1405 1406 cfg.ifa_flags = IFA_F_TEMPORARY; 1407 /* set in addrconf_prefix_rcv() */ 1408 if (ifp->flags & IFA_F_OPTIMISTIC) 1409 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 1410 1411 cfg.pfx = &addr; 1412 cfg.scope = ipv6_addr_scope(cfg.pfx); 1413 1414 ift = ipv6_add_addr(idev, &cfg, block, NULL); 1415 if (IS_ERR(ift)) { 1416 in6_ifa_put(ifp); 1417 in6_dev_put(idev); 1418 pr_info("%s: retry temporary address regeneration\n", __func__); 1419 write_lock_bh(&idev->lock); 1420 goto retry; 1421 } 1422 1423 spin_lock_bh(&ift->lock); 1424 ift->ifpub = ifp; 1425 ift->cstamp = now; 1426 ift->tstamp = tmp_tstamp; 1427 spin_unlock_bh(&ift->lock); 1428 1429 addrconf_dad_start(ift); 1430 in6_ifa_put(ift); 1431 in6_dev_put(idev); 1432 out: 1433 return ret; 1434 } 1435 1436 /* 1437 * Choose an appropriate source address (RFC3484) 1438 */ 1439 enum { 1440 IPV6_SADDR_RULE_INIT = 0, 1441 IPV6_SADDR_RULE_LOCAL, 1442 IPV6_SADDR_RULE_SCOPE, 1443 IPV6_SADDR_RULE_PREFERRED, 1444 #ifdef CONFIG_IPV6_MIP6 1445 IPV6_SADDR_RULE_HOA, 1446 #endif 1447 IPV6_SADDR_RULE_OIF, 1448 IPV6_SADDR_RULE_LABEL, 1449 IPV6_SADDR_RULE_PRIVACY, 1450 IPV6_SADDR_RULE_ORCHID, 1451 IPV6_SADDR_RULE_PREFIX, 1452 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1453 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1454 #endif 1455 IPV6_SADDR_RULE_MAX 1456 }; 1457 1458 struct ipv6_saddr_score { 1459 int rule; 1460 int addr_type; 1461 struct inet6_ifaddr *ifa; 1462 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1463 int scopedist; 1464 int matchlen; 1465 }; 1466 1467 struct ipv6_saddr_dst { 1468 const struct in6_addr *addr; 1469 int ifindex; 1470 int scope; 1471 int label; 1472 unsigned int prefs; 1473 }; 1474 1475 static inline int ipv6_saddr_preferred(int type) 1476 { 1477 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1478 return 1; 1479 return 0; 1480 } 1481 1482 static bool ipv6_use_optimistic_addr(struct net *net, 1483 struct inet6_dev *idev) 1484 { 1485 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1486 if (!idev) 1487 return false; 1488 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1489 return false; 1490 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic) 1491 return false; 1492 1493 return true; 1494 #else 1495 return false; 1496 #endif 1497 } 1498 1499 static bool ipv6_allow_optimistic_dad(struct net *net, 1500 struct inet6_dev *idev) 1501 { 1502 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1503 if (!idev) 1504 return false; 1505 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1506 return false; 1507 1508 return true; 1509 #else 1510 return false; 1511 #endif 1512 } 1513 1514 static int ipv6_get_saddr_eval(struct net *net, 1515 struct ipv6_saddr_score *score, 1516 struct ipv6_saddr_dst *dst, 1517 int i) 1518 { 1519 int ret; 1520 1521 if (i <= score->rule) { 1522 switch (i) { 1523 case IPV6_SADDR_RULE_SCOPE: 1524 ret = score->scopedist; 1525 break; 1526 case IPV6_SADDR_RULE_PREFIX: 1527 ret = score->matchlen; 1528 break; 1529 default: 1530 ret = !!test_bit(i, score->scorebits); 1531 } 1532 goto out; 1533 } 1534 1535 switch (i) { 1536 case IPV6_SADDR_RULE_INIT: 1537 /* Rule 0: remember if hiscore is not ready yet */ 1538 ret = !!score->ifa; 1539 break; 1540 case IPV6_SADDR_RULE_LOCAL: 1541 /* Rule 1: Prefer same address */ 1542 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1543 break; 1544 case IPV6_SADDR_RULE_SCOPE: 1545 /* Rule 2: Prefer appropriate scope 1546 * 1547 * ret 1548 * ^ 1549 * -1 | d 15 1550 * ---+--+-+---> scope 1551 * | 1552 * | d is scope of the destination. 1553 * B-d | \ 1554 * | \ <- smaller scope is better if 1555 * B-15 | \ if scope is enough for destination. 1556 * | ret = B - scope (-1 <= scope >= d <= 15). 1557 * d-C-1 | / 1558 * |/ <- greater is better 1559 * -C / if scope is not enough for destination. 1560 * /| ret = scope - C (-1 <= d < scope <= 15). 1561 * 1562 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1563 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1564 * Assume B = 0 and we get C > 29. 1565 */ 1566 ret = __ipv6_addr_src_scope(score->addr_type); 1567 if (ret >= dst->scope) 1568 ret = -ret; 1569 else 1570 ret -= 128; /* 30 is enough */ 1571 score->scopedist = ret; 1572 break; 1573 case IPV6_SADDR_RULE_PREFERRED: 1574 { 1575 /* Rule 3: Avoid deprecated and optimistic addresses */ 1576 u8 avoid = IFA_F_DEPRECATED; 1577 1578 if (!ipv6_use_optimistic_addr(net, score->ifa->idev)) 1579 avoid |= IFA_F_OPTIMISTIC; 1580 ret = ipv6_saddr_preferred(score->addr_type) || 1581 !(score->ifa->flags & avoid); 1582 break; 1583 } 1584 #ifdef CONFIG_IPV6_MIP6 1585 case IPV6_SADDR_RULE_HOA: 1586 { 1587 /* Rule 4: Prefer home address */ 1588 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1589 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1590 break; 1591 } 1592 #endif 1593 case IPV6_SADDR_RULE_OIF: 1594 /* Rule 5: Prefer outgoing interface */ 1595 ret = (!dst->ifindex || 1596 dst->ifindex == score->ifa->idev->dev->ifindex); 1597 break; 1598 case IPV6_SADDR_RULE_LABEL: 1599 /* Rule 6: Prefer matching label */ 1600 ret = ipv6_addr_label(net, 1601 &score->ifa->addr, score->addr_type, 1602 score->ifa->idev->dev->ifindex) == dst->label; 1603 break; 1604 case IPV6_SADDR_RULE_PRIVACY: 1605 { 1606 /* Rule 7: Prefer public address 1607 * Note: prefer temporary address if use_tempaddr >= 2 1608 */ 1609 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1610 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1611 score->ifa->idev->cnf.use_tempaddr >= 2; 1612 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1613 break; 1614 } 1615 case IPV6_SADDR_RULE_ORCHID: 1616 /* Rule 8-: Prefer ORCHID vs ORCHID or 1617 * non-ORCHID vs non-ORCHID 1618 */ 1619 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1620 ipv6_addr_orchid(dst->addr)); 1621 break; 1622 case IPV6_SADDR_RULE_PREFIX: 1623 /* Rule 8: Use longest matching prefix */ 1624 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1625 if (ret > score->ifa->prefix_len) 1626 ret = score->ifa->prefix_len; 1627 score->matchlen = ret; 1628 break; 1629 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1630 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1631 /* Optimistic addresses still have lower precedence than other 1632 * preferred addresses. 1633 */ 1634 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1635 break; 1636 #endif 1637 default: 1638 ret = 0; 1639 } 1640 1641 if (ret) 1642 __set_bit(i, score->scorebits); 1643 score->rule = i; 1644 out: 1645 return ret; 1646 } 1647 1648 static int __ipv6_dev_get_saddr(struct net *net, 1649 struct ipv6_saddr_dst *dst, 1650 struct inet6_dev *idev, 1651 struct ipv6_saddr_score *scores, 1652 int hiscore_idx) 1653 { 1654 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1655 1656 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) { 1657 int i; 1658 1659 /* 1660 * - Tentative Address (RFC2462 section 5.4) 1661 * - A tentative address is not considered 1662 * "assigned to an interface" in the traditional 1663 * sense, unless it is also flagged as optimistic. 1664 * - Candidate Source Address (section 4) 1665 * - In any case, anycast addresses, multicast 1666 * addresses, and the unspecified address MUST 1667 * NOT be included in a candidate set. 1668 */ 1669 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1670 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1671 continue; 1672 1673 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1674 1675 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1676 score->addr_type & IPV6_ADDR_MULTICAST)) { 1677 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1678 idev->dev->name); 1679 continue; 1680 } 1681 1682 score->rule = -1; 1683 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1684 1685 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1686 int minihiscore, miniscore; 1687 1688 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1689 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1690 1691 if (minihiscore > miniscore) { 1692 if (i == IPV6_SADDR_RULE_SCOPE && 1693 score->scopedist > 0) { 1694 /* 1695 * special case: 1696 * each remaining entry 1697 * has too small (not enough) 1698 * scope, because ifa entries 1699 * are sorted by their scope 1700 * values. 1701 */ 1702 goto out; 1703 } 1704 break; 1705 } else if (minihiscore < miniscore) { 1706 swap(hiscore, score); 1707 hiscore_idx = 1 - hiscore_idx; 1708 1709 /* restore our iterator */ 1710 score->ifa = hiscore->ifa; 1711 1712 break; 1713 } 1714 } 1715 } 1716 out: 1717 return hiscore_idx; 1718 } 1719 1720 static int ipv6_get_saddr_master(struct net *net, 1721 const struct net_device *dst_dev, 1722 const struct net_device *master, 1723 struct ipv6_saddr_dst *dst, 1724 struct ipv6_saddr_score *scores, 1725 int hiscore_idx) 1726 { 1727 struct inet6_dev *idev; 1728 1729 idev = __in6_dev_get(dst_dev); 1730 if (idev) 1731 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1732 scores, hiscore_idx); 1733 1734 idev = __in6_dev_get(master); 1735 if (idev) 1736 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1737 scores, hiscore_idx); 1738 1739 return hiscore_idx; 1740 } 1741 1742 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1743 const struct in6_addr *daddr, unsigned int prefs, 1744 struct in6_addr *saddr) 1745 { 1746 struct ipv6_saddr_score scores[2], *hiscore; 1747 struct ipv6_saddr_dst dst; 1748 struct inet6_dev *idev; 1749 struct net_device *dev; 1750 int dst_type; 1751 bool use_oif_addr = false; 1752 int hiscore_idx = 0; 1753 int ret = 0; 1754 1755 dst_type = __ipv6_addr_type(daddr); 1756 dst.addr = daddr; 1757 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1758 dst.scope = __ipv6_addr_src_scope(dst_type); 1759 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1760 dst.prefs = prefs; 1761 1762 scores[hiscore_idx].rule = -1; 1763 scores[hiscore_idx].ifa = NULL; 1764 1765 rcu_read_lock(); 1766 1767 /* Candidate Source Address (section 4) 1768 * - multicast and link-local destination address, 1769 * the set of candidate source address MUST only 1770 * include addresses assigned to interfaces 1771 * belonging to the same link as the outgoing 1772 * interface. 1773 * (- For site-local destination addresses, the 1774 * set of candidate source addresses MUST only 1775 * include addresses assigned to interfaces 1776 * belonging to the same site as the outgoing 1777 * interface.) 1778 * - "It is RECOMMENDED that the candidate source addresses 1779 * be the set of unicast addresses assigned to the 1780 * interface that will be used to send to the destination 1781 * (the 'outgoing' interface)." (RFC 6724) 1782 */ 1783 if (dst_dev) { 1784 idev = __in6_dev_get(dst_dev); 1785 if ((dst_type & IPV6_ADDR_MULTICAST) || 1786 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1787 (idev && idev->cnf.use_oif_addrs_only)) { 1788 use_oif_addr = true; 1789 } 1790 } 1791 1792 if (use_oif_addr) { 1793 if (idev) 1794 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1795 } else { 1796 const struct net_device *master; 1797 int master_idx = 0; 1798 1799 /* if dst_dev exists and is enslaved to an L3 device, then 1800 * prefer addresses from dst_dev and then the master over 1801 * any other enslaved devices in the L3 domain. 1802 */ 1803 master = l3mdev_master_dev_rcu(dst_dev); 1804 if (master) { 1805 master_idx = master->ifindex; 1806 1807 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1808 master, &dst, 1809 scores, hiscore_idx); 1810 1811 if (scores[hiscore_idx].ifa) 1812 goto out; 1813 } 1814 1815 for_each_netdev_rcu(net, dev) { 1816 /* only consider addresses on devices in the 1817 * same L3 domain 1818 */ 1819 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1820 continue; 1821 idev = __in6_dev_get(dev); 1822 if (!idev) 1823 continue; 1824 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1825 } 1826 } 1827 1828 out: 1829 hiscore = &scores[hiscore_idx]; 1830 if (!hiscore->ifa) 1831 ret = -EADDRNOTAVAIL; 1832 else 1833 *saddr = hiscore->ifa->addr; 1834 1835 rcu_read_unlock(); 1836 return ret; 1837 } 1838 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1839 1840 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1841 u32 banned_flags) 1842 { 1843 struct inet6_ifaddr *ifp; 1844 int err = -EADDRNOTAVAIL; 1845 1846 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1847 if (ifp->scope > IFA_LINK) 1848 break; 1849 if (ifp->scope == IFA_LINK && 1850 !(ifp->flags & banned_flags)) { 1851 *addr = ifp->addr; 1852 err = 0; 1853 break; 1854 } 1855 } 1856 return err; 1857 } 1858 1859 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1860 u32 banned_flags) 1861 { 1862 struct inet6_dev *idev; 1863 int err = -EADDRNOTAVAIL; 1864 1865 rcu_read_lock(); 1866 idev = __in6_dev_get(dev); 1867 if (idev) { 1868 read_lock_bh(&idev->lock); 1869 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1870 read_unlock_bh(&idev->lock); 1871 } 1872 rcu_read_unlock(); 1873 return err; 1874 } 1875 1876 static int ipv6_count_addresses(const struct inet6_dev *idev) 1877 { 1878 const struct inet6_ifaddr *ifp; 1879 int cnt = 0; 1880 1881 rcu_read_lock(); 1882 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list) 1883 cnt++; 1884 rcu_read_unlock(); 1885 return cnt; 1886 } 1887 1888 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1889 const struct net_device *dev, int strict) 1890 { 1891 return ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1892 strict, IFA_F_TENTATIVE); 1893 } 1894 EXPORT_SYMBOL(ipv6_chk_addr); 1895 1896 /* device argument is used to find the L3 domain of interest. If 1897 * skip_dev_check is set, then the ifp device is not checked against 1898 * the passed in dev argument. So the 2 cases for addresses checks are: 1899 * 1. does the address exist in the L3 domain that dev is part of 1900 * (skip_dev_check = true), or 1901 * 1902 * 2. does the address exist on the specific device 1903 * (skip_dev_check = false) 1904 */ 1905 static struct net_device * 1906 __ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1907 const struct net_device *dev, bool skip_dev_check, 1908 int strict, u32 banned_flags) 1909 { 1910 unsigned int hash = inet6_addr_hash(net, addr); 1911 struct net_device *l3mdev, *ndev; 1912 struct inet6_ifaddr *ifp; 1913 u32 ifp_flags; 1914 1915 rcu_read_lock(); 1916 1917 l3mdev = l3mdev_master_dev_rcu(dev); 1918 if (skip_dev_check) 1919 dev = NULL; 1920 1921 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1922 ndev = ifp->idev->dev; 1923 if (!net_eq(dev_net(ndev), net)) 1924 continue; 1925 1926 if (l3mdev_master_dev_rcu(ndev) != l3mdev) 1927 continue; 1928 1929 /* Decouple optimistic from tentative for evaluation here. 1930 * Ban optimistic addresses explicitly, when required. 1931 */ 1932 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1933 ? (ifp->flags&~IFA_F_TENTATIVE) 1934 : ifp->flags; 1935 if (ipv6_addr_equal(&ifp->addr, addr) && 1936 !(ifp_flags&banned_flags) && 1937 (!dev || ndev == dev || 1938 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1939 rcu_read_unlock(); 1940 return ndev; 1941 } 1942 } 1943 1944 rcu_read_unlock(); 1945 return NULL; 1946 } 1947 1948 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1949 const struct net_device *dev, bool skip_dev_check, 1950 int strict, u32 banned_flags) 1951 { 1952 return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check, 1953 strict, banned_flags) ? 1 : 0; 1954 } 1955 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1956 1957 1958 /* Compares an address/prefix_len with addresses on device @dev. 1959 * If one is found it returns true. 1960 */ 1961 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1962 const unsigned int prefix_len, struct net_device *dev) 1963 { 1964 const struct inet6_ifaddr *ifa; 1965 const struct inet6_dev *idev; 1966 bool ret = false; 1967 1968 rcu_read_lock(); 1969 idev = __in6_dev_get(dev); 1970 if (idev) { 1971 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1972 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1973 if (ret) 1974 break; 1975 } 1976 } 1977 rcu_read_unlock(); 1978 1979 return ret; 1980 } 1981 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1982 1983 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1984 { 1985 const struct inet6_ifaddr *ifa; 1986 const struct inet6_dev *idev; 1987 int onlink; 1988 1989 onlink = 0; 1990 rcu_read_lock(); 1991 idev = __in6_dev_get(dev); 1992 if (idev) { 1993 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1994 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1995 ifa->prefix_len); 1996 if (onlink) 1997 break; 1998 } 1999 } 2000 rcu_read_unlock(); 2001 return onlink; 2002 } 2003 EXPORT_SYMBOL(ipv6_chk_prefix); 2004 2005 /** 2006 * ipv6_dev_find - find the first device with a given source address. 2007 * @net: the net namespace 2008 * @addr: the source address 2009 * @dev: used to find the L3 domain of interest 2010 * 2011 * The caller should be protected by RCU, or RTNL. 2012 */ 2013 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr, 2014 struct net_device *dev) 2015 { 2016 return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1, 2017 IFA_F_TENTATIVE); 2018 } 2019 EXPORT_SYMBOL(ipv6_dev_find); 2020 2021 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 2022 struct net_device *dev, int strict) 2023 { 2024 unsigned int hash = inet6_addr_hash(net, addr); 2025 struct inet6_ifaddr *ifp, *result = NULL; 2026 2027 rcu_read_lock(); 2028 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 2029 if (!net_eq(dev_net(ifp->idev->dev), net)) 2030 continue; 2031 if (ipv6_addr_equal(&ifp->addr, addr)) { 2032 if (!dev || ifp->idev->dev == dev || 2033 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 2034 result = ifp; 2035 in6_ifa_hold(ifp); 2036 break; 2037 } 2038 } 2039 } 2040 rcu_read_unlock(); 2041 2042 return result; 2043 } 2044 2045 /* Gets referenced address, destroys ifaddr */ 2046 2047 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 2048 { 2049 if (dad_failed) 2050 ifp->flags |= IFA_F_DADFAILED; 2051 2052 if (ifp->flags&IFA_F_TEMPORARY) { 2053 struct inet6_ifaddr *ifpub; 2054 spin_lock_bh(&ifp->lock); 2055 ifpub = ifp->ifpub; 2056 if (ifpub) { 2057 in6_ifa_hold(ifpub); 2058 spin_unlock_bh(&ifp->lock); 2059 ipv6_create_tempaddr(ifpub, true); 2060 in6_ifa_put(ifpub); 2061 } else { 2062 spin_unlock_bh(&ifp->lock); 2063 } 2064 ipv6_del_addr(ifp); 2065 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) { 2066 spin_lock_bh(&ifp->lock); 2067 addrconf_del_dad_work(ifp); 2068 ifp->flags |= IFA_F_TENTATIVE; 2069 if (dad_failed) 2070 ifp->flags &= ~IFA_F_OPTIMISTIC; 2071 spin_unlock_bh(&ifp->lock); 2072 if (dad_failed) 2073 ipv6_ifa_notify(0, ifp); 2074 in6_ifa_put(ifp); 2075 } else { 2076 ipv6_del_addr(ifp); 2077 } 2078 } 2079 2080 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 2081 { 2082 int err = -ENOENT; 2083 2084 spin_lock_bh(&ifp->lock); 2085 if (ifp->state == INET6_IFADDR_STATE_DAD) { 2086 ifp->state = INET6_IFADDR_STATE_POSTDAD; 2087 err = 0; 2088 } 2089 spin_unlock_bh(&ifp->lock); 2090 2091 return err; 2092 } 2093 2094 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp) 2095 { 2096 struct inet6_dev *idev = ifp->idev; 2097 struct net *net = dev_net(ifp->idev->dev); 2098 2099 if (addrconf_dad_end(ifp)) { 2100 in6_ifa_put(ifp); 2101 return; 2102 } 2103 2104 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n", 2105 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source); 2106 2107 spin_lock_bh(&ifp->lock); 2108 2109 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 2110 struct in6_addr new_addr; 2111 struct inet6_ifaddr *ifp2; 2112 int retries = ifp->stable_privacy_retry + 1; 2113 struct ifa6_config cfg = { 2114 .pfx = &new_addr, 2115 .plen = ifp->prefix_len, 2116 .ifa_flags = ifp->flags, 2117 .valid_lft = ifp->valid_lft, 2118 .preferred_lft = ifp->prefered_lft, 2119 .scope = ifp->scope, 2120 }; 2121 2122 if (retries > net->ipv6.sysctl.idgen_retries) { 2123 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 2124 ifp->idev->dev->name); 2125 goto errdad; 2126 } 2127 2128 new_addr = ifp->addr; 2129 if (ipv6_generate_stable_address(&new_addr, retries, 2130 idev)) 2131 goto errdad; 2132 2133 spin_unlock_bh(&ifp->lock); 2134 2135 if (idev->cnf.max_addresses && 2136 ipv6_count_addresses(idev) >= 2137 idev->cnf.max_addresses) 2138 goto lock_errdad; 2139 2140 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 2141 ifp->idev->dev->name); 2142 2143 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL); 2144 if (IS_ERR(ifp2)) 2145 goto lock_errdad; 2146 2147 spin_lock_bh(&ifp2->lock); 2148 ifp2->stable_privacy_retry = retries; 2149 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2150 spin_unlock_bh(&ifp2->lock); 2151 2152 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2153 in6_ifa_put(ifp2); 2154 lock_errdad: 2155 spin_lock_bh(&ifp->lock); 2156 } 2157 2158 errdad: 2159 /* transition from _POSTDAD to _ERRDAD */ 2160 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2161 spin_unlock_bh(&ifp->lock); 2162 2163 addrconf_mod_dad_work(ifp, 0); 2164 in6_ifa_put(ifp); 2165 } 2166 2167 /* Join to solicited addr multicast group. 2168 * caller must hold RTNL */ 2169 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2170 { 2171 struct in6_addr maddr; 2172 2173 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2174 return; 2175 2176 addrconf_addr_solict_mult(addr, &maddr); 2177 ipv6_dev_mc_inc(dev, &maddr); 2178 } 2179 2180 /* caller must hold RTNL */ 2181 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2182 { 2183 struct in6_addr maddr; 2184 2185 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2186 return; 2187 2188 addrconf_addr_solict_mult(addr, &maddr); 2189 __ipv6_dev_mc_dec(idev, &maddr); 2190 } 2191 2192 /* caller must hold RTNL */ 2193 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2194 { 2195 struct in6_addr addr; 2196 2197 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2198 return; 2199 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2200 if (ipv6_addr_any(&addr)) 2201 return; 2202 __ipv6_dev_ac_inc(ifp->idev, &addr); 2203 } 2204 2205 /* caller must hold RTNL */ 2206 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2207 { 2208 struct in6_addr addr; 2209 2210 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2211 return; 2212 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2213 if (ipv6_addr_any(&addr)) 2214 return; 2215 __ipv6_dev_ac_dec(ifp->idev, &addr); 2216 } 2217 2218 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2219 { 2220 switch (dev->addr_len) { 2221 case ETH_ALEN: 2222 memcpy(eui, dev->dev_addr, 3); 2223 eui[3] = 0xFF; 2224 eui[4] = 0xFE; 2225 memcpy(eui + 5, dev->dev_addr + 3, 3); 2226 break; 2227 case EUI64_ADDR_LEN: 2228 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2229 eui[0] ^= 2; 2230 break; 2231 default: 2232 return -1; 2233 } 2234 2235 return 0; 2236 } 2237 2238 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2239 { 2240 union fwnet_hwaddr *ha; 2241 2242 if (dev->addr_len != FWNET_ALEN) 2243 return -1; 2244 2245 ha = (union fwnet_hwaddr *)dev->dev_addr; 2246 2247 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2248 eui[0] ^= 2; 2249 return 0; 2250 } 2251 2252 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2253 { 2254 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2255 if (dev->addr_len != ARCNET_ALEN) 2256 return -1; 2257 memset(eui, 0, 7); 2258 eui[7] = *(u8 *)dev->dev_addr; 2259 return 0; 2260 } 2261 2262 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2263 { 2264 if (dev->addr_len != INFINIBAND_ALEN) 2265 return -1; 2266 memcpy(eui, dev->dev_addr + 12, 8); 2267 eui[0] |= 2; 2268 return 0; 2269 } 2270 2271 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2272 { 2273 if (addr == 0) 2274 return -1; 2275 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2276 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2277 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2278 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2279 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2280 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2281 eui[1] = 0; 2282 eui[2] = 0x5E; 2283 eui[3] = 0xFE; 2284 memcpy(eui + 4, &addr, 4); 2285 return 0; 2286 } 2287 2288 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2289 { 2290 if (dev->priv_flags & IFF_ISATAP) 2291 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2292 return -1; 2293 } 2294 2295 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2296 { 2297 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2298 } 2299 2300 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2301 { 2302 memcpy(eui, dev->perm_addr, 3); 2303 memcpy(eui + 5, dev->perm_addr + 3, 3); 2304 eui[3] = 0xFF; 2305 eui[4] = 0xFE; 2306 eui[0] ^= 2; 2307 return 0; 2308 } 2309 2310 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2311 { 2312 switch (dev->type) { 2313 case ARPHRD_ETHER: 2314 case ARPHRD_FDDI: 2315 return addrconf_ifid_eui48(eui, dev); 2316 case ARPHRD_ARCNET: 2317 return addrconf_ifid_arcnet(eui, dev); 2318 case ARPHRD_INFINIBAND: 2319 return addrconf_ifid_infiniband(eui, dev); 2320 case ARPHRD_SIT: 2321 return addrconf_ifid_sit(eui, dev); 2322 case ARPHRD_IPGRE: 2323 case ARPHRD_TUNNEL: 2324 return addrconf_ifid_gre(eui, dev); 2325 case ARPHRD_6LOWPAN: 2326 return addrconf_ifid_6lowpan(eui, dev); 2327 case ARPHRD_IEEE1394: 2328 return addrconf_ifid_ieee1394(eui, dev); 2329 case ARPHRD_TUNNEL6: 2330 case ARPHRD_IP6GRE: 2331 case ARPHRD_RAWIP: 2332 return addrconf_ifid_ip6tnl(eui, dev); 2333 } 2334 return -1; 2335 } 2336 2337 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2338 { 2339 int err = -1; 2340 struct inet6_ifaddr *ifp; 2341 2342 read_lock_bh(&idev->lock); 2343 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2344 if (ifp->scope > IFA_LINK) 2345 break; 2346 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2347 memcpy(eui, ifp->addr.s6_addr+8, 8); 2348 err = 0; 2349 break; 2350 } 2351 } 2352 read_unlock_bh(&idev->lock); 2353 return err; 2354 } 2355 2356 /* Generation of a randomized Interface Identifier 2357 * draft-ietf-6man-rfc4941bis, Section 3.3.1 2358 */ 2359 2360 static void ipv6_gen_rnd_iid(struct in6_addr *addr) 2361 { 2362 regen: 2363 get_random_bytes(&addr->s6_addr[8], 8); 2364 2365 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1: 2366 * check if generated address is not inappropriate: 2367 * 2368 * - Reserved IPv6 Interface Identifiers 2369 * - XXX: already assigned to an address on the device 2370 */ 2371 2372 /* Subnet-router anycast: 0000:0000:0000:0000 */ 2373 if (!(addr->s6_addr32[2] | addr->s6_addr32[3])) 2374 goto regen; 2375 2376 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212 2377 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213 2378 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF 2379 */ 2380 if (ntohl(addr->s6_addr32[2]) == 0x02005eff && 2381 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000) 2382 goto regen; 2383 2384 /* Reserved subnet anycast addresses */ 2385 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff && 2386 ntohl(addr->s6_addr32[3]) >= 0Xffffff80) 2387 goto regen; 2388 } 2389 2390 /* 2391 * Add prefix route. 2392 */ 2393 2394 static void 2395 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric, 2396 struct net_device *dev, unsigned long expires, 2397 u32 flags, gfp_t gfp_flags) 2398 { 2399 struct fib6_config cfg = { 2400 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2401 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF, 2402 .fc_ifindex = dev->ifindex, 2403 .fc_expires = expires, 2404 .fc_dst_len = plen, 2405 .fc_flags = RTF_UP | flags, 2406 .fc_nlinfo.nl_net = dev_net(dev), 2407 .fc_protocol = RTPROT_KERNEL, 2408 .fc_type = RTN_UNICAST, 2409 }; 2410 2411 cfg.fc_dst = *pfx; 2412 2413 /* Prevent useless cloning on PtP SIT. 2414 This thing is done here expecting that the whole 2415 class of non-broadcast devices need not cloning. 2416 */ 2417 #if IS_ENABLED(CONFIG_IPV6_SIT) 2418 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2419 cfg.fc_flags |= RTF_NONEXTHOP; 2420 #endif 2421 2422 ip6_route_add(&cfg, gfp_flags, NULL); 2423 } 2424 2425 2426 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2427 int plen, 2428 const struct net_device *dev, 2429 u32 flags, u32 noflags, 2430 bool no_gw) 2431 { 2432 struct fib6_node *fn; 2433 struct fib6_info *rt = NULL; 2434 struct fib6_table *table; 2435 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2436 2437 table = fib6_get_table(dev_net(dev), tb_id); 2438 if (!table) 2439 return NULL; 2440 2441 rcu_read_lock(); 2442 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true); 2443 if (!fn) 2444 goto out; 2445 2446 for_each_fib6_node_rt_rcu(fn) { 2447 /* prefix routes only use builtin fib6_nh */ 2448 if (rt->nh) 2449 continue; 2450 2451 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex) 2452 continue; 2453 if (no_gw && rt->fib6_nh->fib_nh_gw_family) 2454 continue; 2455 if ((rt->fib6_flags & flags) != flags) 2456 continue; 2457 if ((rt->fib6_flags & noflags) != 0) 2458 continue; 2459 if (!fib6_info_hold_safe(rt)) 2460 continue; 2461 break; 2462 } 2463 out: 2464 rcu_read_unlock(); 2465 return rt; 2466 } 2467 2468 2469 /* Create "default" multicast route to the interface */ 2470 2471 static void addrconf_add_mroute(struct net_device *dev) 2472 { 2473 struct fib6_config cfg = { 2474 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2475 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2476 .fc_ifindex = dev->ifindex, 2477 .fc_dst_len = 8, 2478 .fc_flags = RTF_UP, 2479 .fc_type = RTN_MULTICAST, 2480 .fc_nlinfo.nl_net = dev_net(dev), 2481 .fc_protocol = RTPROT_KERNEL, 2482 }; 2483 2484 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2485 2486 ip6_route_add(&cfg, GFP_KERNEL, NULL); 2487 } 2488 2489 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2490 { 2491 struct inet6_dev *idev; 2492 2493 ASSERT_RTNL(); 2494 2495 idev = ipv6_find_idev(dev); 2496 if (IS_ERR(idev)) 2497 return idev; 2498 2499 if (idev->cnf.disable_ipv6) 2500 return ERR_PTR(-EACCES); 2501 2502 /* Add default multicast route */ 2503 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2504 addrconf_add_mroute(dev); 2505 2506 return idev; 2507 } 2508 2509 static void manage_tempaddrs(struct inet6_dev *idev, 2510 struct inet6_ifaddr *ifp, 2511 __u32 valid_lft, __u32 prefered_lft, 2512 bool create, unsigned long now) 2513 { 2514 u32 flags; 2515 struct inet6_ifaddr *ift; 2516 2517 read_lock_bh(&idev->lock); 2518 /* update all temporary addresses in the list */ 2519 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2520 int age, max_valid, max_prefered; 2521 2522 if (ifp != ift->ifpub) 2523 continue; 2524 2525 /* RFC 4941 section 3.3: 2526 * If a received option will extend the lifetime of a public 2527 * address, the lifetimes of temporary addresses should 2528 * be extended, subject to the overall constraint that no 2529 * temporary addresses should ever remain "valid" or "preferred" 2530 * for a time longer than (TEMP_VALID_LIFETIME) or 2531 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2532 */ 2533 age = (now - ift->cstamp) / HZ; 2534 max_valid = idev->cnf.temp_valid_lft - age; 2535 if (max_valid < 0) 2536 max_valid = 0; 2537 2538 max_prefered = idev->cnf.temp_prefered_lft - 2539 idev->desync_factor - age; 2540 if (max_prefered < 0) 2541 max_prefered = 0; 2542 2543 if (valid_lft > max_valid) 2544 valid_lft = max_valid; 2545 2546 if (prefered_lft > max_prefered) 2547 prefered_lft = max_prefered; 2548 2549 spin_lock(&ift->lock); 2550 flags = ift->flags; 2551 ift->valid_lft = valid_lft; 2552 ift->prefered_lft = prefered_lft; 2553 ift->tstamp = now; 2554 if (prefered_lft > 0) 2555 ift->flags &= ~IFA_F_DEPRECATED; 2556 2557 spin_unlock(&ift->lock); 2558 if (!(flags&IFA_F_TENTATIVE)) 2559 ipv6_ifa_notify(0, ift); 2560 } 2561 2562 if ((create || list_empty(&idev->tempaddr_list)) && 2563 idev->cnf.use_tempaddr > 0) { 2564 /* When a new public address is created as described 2565 * in [ADDRCONF], also create a new temporary address. 2566 * Also create a temporary address if it's enabled but 2567 * no temporary address currently exists. 2568 */ 2569 read_unlock_bh(&idev->lock); 2570 ipv6_create_tempaddr(ifp, false); 2571 } else { 2572 read_unlock_bh(&idev->lock); 2573 } 2574 } 2575 2576 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2577 { 2578 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2579 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2580 } 2581 2582 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2583 const struct prefix_info *pinfo, 2584 struct inet6_dev *in6_dev, 2585 const struct in6_addr *addr, int addr_type, 2586 u32 addr_flags, bool sllao, bool tokenized, 2587 __u32 valid_lft, u32 prefered_lft) 2588 { 2589 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2590 int create = 0; 2591 2592 if (!ifp && valid_lft) { 2593 int max_addresses = in6_dev->cnf.max_addresses; 2594 struct ifa6_config cfg = { 2595 .pfx = addr, 2596 .plen = pinfo->prefix_len, 2597 .ifa_flags = addr_flags, 2598 .valid_lft = valid_lft, 2599 .preferred_lft = prefered_lft, 2600 .scope = addr_type & IPV6_ADDR_SCOPE_MASK, 2601 }; 2602 2603 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2604 if ((net->ipv6.devconf_all->optimistic_dad || 2605 in6_dev->cnf.optimistic_dad) && 2606 !net->ipv6.devconf_all->forwarding && sllao) 2607 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 2608 #endif 2609 2610 /* Do not allow to create too much of autoconfigured 2611 * addresses; this would be too easy way to crash kernel. 2612 */ 2613 if (!max_addresses || 2614 ipv6_count_addresses(in6_dev) < max_addresses) 2615 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL); 2616 2617 if (IS_ERR_OR_NULL(ifp)) 2618 return -1; 2619 2620 create = 1; 2621 spin_lock_bh(&ifp->lock); 2622 ifp->flags |= IFA_F_MANAGETEMPADDR; 2623 ifp->cstamp = jiffies; 2624 ifp->tokenized = tokenized; 2625 spin_unlock_bh(&ifp->lock); 2626 addrconf_dad_start(ifp); 2627 } 2628 2629 if (ifp) { 2630 u32 flags; 2631 unsigned long now; 2632 u32 stored_lft; 2633 2634 /* Update lifetime (RFC4862 5.5.3 e) 2635 * We deviate from RFC4862 by honoring all Valid Lifetimes to 2636 * improve the reaction of SLAAC to renumbering events 2637 * (draft-gont-6man-slaac-renum-06, Section 4.2) 2638 */ 2639 spin_lock_bh(&ifp->lock); 2640 now = jiffies; 2641 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2642 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2643 else 2644 stored_lft = 0; 2645 2646 if (!create && stored_lft) { 2647 ifp->valid_lft = valid_lft; 2648 ifp->prefered_lft = prefered_lft; 2649 ifp->tstamp = now; 2650 flags = ifp->flags; 2651 ifp->flags &= ~IFA_F_DEPRECATED; 2652 spin_unlock_bh(&ifp->lock); 2653 2654 if (!(flags&IFA_F_TENTATIVE)) 2655 ipv6_ifa_notify(0, ifp); 2656 } else 2657 spin_unlock_bh(&ifp->lock); 2658 2659 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2660 create, now); 2661 2662 in6_ifa_put(ifp); 2663 addrconf_verify(); 2664 } 2665 2666 return 0; 2667 } 2668 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2669 2670 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2671 { 2672 struct prefix_info *pinfo; 2673 __u32 valid_lft; 2674 __u32 prefered_lft; 2675 int addr_type, err; 2676 u32 addr_flags = 0; 2677 struct inet6_dev *in6_dev; 2678 struct net *net = dev_net(dev); 2679 2680 pinfo = (struct prefix_info *) opt; 2681 2682 if (len < sizeof(struct prefix_info)) { 2683 netdev_dbg(dev, "addrconf: prefix option too short\n"); 2684 return; 2685 } 2686 2687 /* 2688 * Validation checks ([ADDRCONF], page 19) 2689 */ 2690 2691 addr_type = ipv6_addr_type(&pinfo->prefix); 2692 2693 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2694 return; 2695 2696 valid_lft = ntohl(pinfo->valid); 2697 prefered_lft = ntohl(pinfo->prefered); 2698 2699 if (prefered_lft > valid_lft) { 2700 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2701 return; 2702 } 2703 2704 in6_dev = in6_dev_get(dev); 2705 2706 if (!in6_dev) { 2707 net_dbg_ratelimited("addrconf: device %s not configured\n", 2708 dev->name); 2709 return; 2710 } 2711 2712 /* 2713 * Two things going on here: 2714 * 1) Add routes for on-link prefixes 2715 * 2) Configure prefixes with the auto flag set 2716 */ 2717 2718 if (pinfo->onlink) { 2719 struct fib6_info *rt; 2720 unsigned long rt_expires; 2721 2722 /* Avoid arithmetic overflow. Really, we could 2723 * save rt_expires in seconds, likely valid_lft, 2724 * but it would require division in fib gc, that it 2725 * not good. 2726 */ 2727 if (HZ > USER_HZ) 2728 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2729 else 2730 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2731 2732 if (addrconf_finite_timeout(rt_expires)) 2733 rt_expires *= HZ; 2734 2735 rt = addrconf_get_prefix_route(&pinfo->prefix, 2736 pinfo->prefix_len, 2737 dev, 2738 RTF_ADDRCONF | RTF_PREFIX_RT, 2739 RTF_DEFAULT, true); 2740 2741 if (rt) { 2742 /* Autoconf prefix route */ 2743 if (valid_lft == 0) { 2744 ip6_del_rt(net, rt, false); 2745 rt = NULL; 2746 } else if (addrconf_finite_timeout(rt_expires)) { 2747 /* not infinity */ 2748 fib6_set_expires(rt, jiffies + rt_expires); 2749 } else { 2750 fib6_clean_expires(rt); 2751 } 2752 } else if (valid_lft) { 2753 clock_t expires = 0; 2754 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2755 if (addrconf_finite_timeout(rt_expires)) { 2756 /* not infinity */ 2757 flags |= RTF_EXPIRES; 2758 expires = jiffies_to_clock_t(rt_expires); 2759 } 2760 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2761 0, dev, expires, flags, 2762 GFP_ATOMIC); 2763 } 2764 fib6_info_release(rt); 2765 } 2766 2767 /* Try to figure out our local address for this prefix */ 2768 2769 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2770 struct in6_addr addr; 2771 bool tokenized = false, dev_addr_generated = false; 2772 2773 if (pinfo->prefix_len == 64) { 2774 memcpy(&addr, &pinfo->prefix, 8); 2775 2776 if (!ipv6_addr_any(&in6_dev->token)) { 2777 read_lock_bh(&in6_dev->lock); 2778 memcpy(addr.s6_addr + 8, 2779 in6_dev->token.s6_addr + 8, 8); 2780 read_unlock_bh(&in6_dev->lock); 2781 tokenized = true; 2782 } else if (is_addr_mode_generate_stable(in6_dev) && 2783 !ipv6_generate_stable_address(&addr, 0, 2784 in6_dev)) { 2785 addr_flags |= IFA_F_STABLE_PRIVACY; 2786 goto ok; 2787 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2788 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2789 goto put; 2790 } else { 2791 dev_addr_generated = true; 2792 } 2793 goto ok; 2794 } 2795 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2796 pinfo->prefix_len); 2797 goto put; 2798 2799 ok: 2800 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2801 &addr, addr_type, 2802 addr_flags, sllao, 2803 tokenized, valid_lft, 2804 prefered_lft); 2805 if (err) 2806 goto put; 2807 2808 /* Ignore error case here because previous prefix add addr was 2809 * successful which will be notified. 2810 */ 2811 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2812 addr_type, addr_flags, sllao, 2813 tokenized, valid_lft, 2814 prefered_lft, 2815 dev_addr_generated); 2816 } 2817 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2818 put: 2819 in6_dev_put(in6_dev); 2820 } 2821 2822 static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev, 2823 struct in6_ifreq *ireq) 2824 { 2825 struct ip_tunnel_parm p = { }; 2826 int err; 2827 2828 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4)) 2829 return -EADDRNOTAVAIL; 2830 2831 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3]; 2832 p.iph.version = 4; 2833 p.iph.ihl = 5; 2834 p.iph.protocol = IPPROTO_IPV6; 2835 p.iph.ttl = 64; 2836 2837 if (!dev->netdev_ops->ndo_tunnel_ctl) 2838 return -EOPNOTSUPP; 2839 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL); 2840 if (err) 2841 return err; 2842 2843 dev = __dev_get_by_name(net, p.name); 2844 if (!dev) 2845 return -ENOBUFS; 2846 return dev_open(dev, NULL); 2847 } 2848 2849 /* 2850 * Set destination address. 2851 * Special case for SIT interfaces where we create a new "virtual" 2852 * device. 2853 */ 2854 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2855 { 2856 struct net_device *dev; 2857 struct in6_ifreq ireq; 2858 int err = -ENODEV; 2859 2860 if (!IS_ENABLED(CONFIG_IPV6_SIT)) 2861 return -ENODEV; 2862 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2863 return -EFAULT; 2864 2865 rtnl_lock(); 2866 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2867 if (dev && dev->type == ARPHRD_SIT) 2868 err = addrconf_set_sit_dstaddr(net, dev, &ireq); 2869 rtnl_unlock(); 2870 return err; 2871 } 2872 2873 static int ipv6_mc_config(struct sock *sk, bool join, 2874 const struct in6_addr *addr, int ifindex) 2875 { 2876 int ret; 2877 2878 ASSERT_RTNL(); 2879 2880 lock_sock(sk); 2881 if (join) 2882 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2883 else 2884 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2885 release_sock(sk); 2886 2887 return ret; 2888 } 2889 2890 /* 2891 * Manual configuration of address on an interface 2892 */ 2893 static int inet6_addr_add(struct net *net, int ifindex, 2894 struct ifa6_config *cfg, 2895 struct netlink_ext_ack *extack) 2896 { 2897 struct inet6_ifaddr *ifp; 2898 struct inet6_dev *idev; 2899 struct net_device *dev; 2900 unsigned long timeout; 2901 clock_t expires; 2902 u32 flags; 2903 2904 ASSERT_RTNL(); 2905 2906 if (cfg->plen > 128) 2907 return -EINVAL; 2908 2909 /* check the lifetime */ 2910 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 2911 return -EINVAL; 2912 2913 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) 2914 return -EINVAL; 2915 2916 dev = __dev_get_by_index(net, ifindex); 2917 if (!dev) 2918 return -ENODEV; 2919 2920 idev = addrconf_add_dev(dev); 2921 if (IS_ERR(idev)) 2922 return PTR_ERR(idev); 2923 2924 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2925 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2926 true, cfg->pfx, ifindex); 2927 2928 if (ret < 0) 2929 return ret; 2930 } 2931 2932 cfg->scope = ipv6_addr_scope(cfg->pfx); 2933 2934 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 2935 if (addrconf_finite_timeout(timeout)) { 2936 expires = jiffies_to_clock_t(timeout * HZ); 2937 cfg->valid_lft = timeout; 2938 flags = RTF_EXPIRES; 2939 } else { 2940 expires = 0; 2941 flags = 0; 2942 cfg->ifa_flags |= IFA_F_PERMANENT; 2943 } 2944 2945 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 2946 if (addrconf_finite_timeout(timeout)) { 2947 if (timeout == 0) 2948 cfg->ifa_flags |= IFA_F_DEPRECATED; 2949 cfg->preferred_lft = timeout; 2950 } 2951 2952 ifp = ipv6_add_addr(idev, cfg, true, extack); 2953 if (!IS_ERR(ifp)) { 2954 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 2955 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 2956 ifp->rt_priority, dev, expires, 2957 flags, GFP_KERNEL); 2958 } 2959 2960 /* Send a netlink notification if DAD is enabled and 2961 * optimistic flag is not set 2962 */ 2963 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD))) 2964 ipv6_ifa_notify(0, ifp); 2965 /* 2966 * Note that section 3.1 of RFC 4429 indicates 2967 * that the Optimistic flag should not be set for 2968 * manually configured addresses 2969 */ 2970 addrconf_dad_start(ifp); 2971 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR) 2972 manage_tempaddrs(idev, ifp, cfg->valid_lft, 2973 cfg->preferred_lft, true, jiffies); 2974 in6_ifa_put(ifp); 2975 addrconf_verify_rtnl(); 2976 return 0; 2977 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2978 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false, 2979 cfg->pfx, ifindex); 2980 } 2981 2982 return PTR_ERR(ifp); 2983 } 2984 2985 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2986 const struct in6_addr *pfx, unsigned int plen) 2987 { 2988 struct inet6_ifaddr *ifp; 2989 struct inet6_dev *idev; 2990 struct net_device *dev; 2991 2992 if (plen > 128) 2993 return -EINVAL; 2994 2995 dev = __dev_get_by_index(net, ifindex); 2996 if (!dev) 2997 return -ENODEV; 2998 2999 idev = __in6_dev_get(dev); 3000 if (!idev) 3001 return -ENXIO; 3002 3003 read_lock_bh(&idev->lock); 3004 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3005 if (ifp->prefix_len == plen && 3006 ipv6_addr_equal(pfx, &ifp->addr)) { 3007 in6_ifa_hold(ifp); 3008 read_unlock_bh(&idev->lock); 3009 3010 if (!(ifp->flags & IFA_F_TEMPORARY) && 3011 (ifa_flags & IFA_F_MANAGETEMPADDR)) 3012 manage_tempaddrs(idev, ifp, 0, 0, false, 3013 jiffies); 3014 ipv6_del_addr(ifp); 3015 addrconf_verify_rtnl(); 3016 if (ipv6_addr_is_multicast(pfx)) { 3017 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 3018 false, pfx, dev->ifindex); 3019 } 3020 return 0; 3021 } 3022 } 3023 read_unlock_bh(&idev->lock); 3024 return -EADDRNOTAVAIL; 3025 } 3026 3027 3028 int addrconf_add_ifaddr(struct net *net, void __user *arg) 3029 { 3030 struct ifa6_config cfg = { 3031 .ifa_flags = IFA_F_PERMANENT, 3032 .preferred_lft = INFINITY_LIFE_TIME, 3033 .valid_lft = INFINITY_LIFE_TIME, 3034 }; 3035 struct in6_ifreq ireq; 3036 int err; 3037 3038 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3039 return -EPERM; 3040 3041 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3042 return -EFAULT; 3043 3044 cfg.pfx = &ireq.ifr6_addr; 3045 cfg.plen = ireq.ifr6_prefixlen; 3046 3047 rtnl_lock(); 3048 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL); 3049 rtnl_unlock(); 3050 return err; 3051 } 3052 3053 int addrconf_del_ifaddr(struct net *net, void __user *arg) 3054 { 3055 struct in6_ifreq ireq; 3056 int err; 3057 3058 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3059 return -EPERM; 3060 3061 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3062 return -EFAULT; 3063 3064 rtnl_lock(); 3065 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 3066 ireq.ifr6_prefixlen); 3067 rtnl_unlock(); 3068 return err; 3069 } 3070 3071 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 3072 int plen, int scope) 3073 { 3074 struct inet6_ifaddr *ifp; 3075 struct ifa6_config cfg = { 3076 .pfx = addr, 3077 .plen = plen, 3078 .ifa_flags = IFA_F_PERMANENT, 3079 .valid_lft = INFINITY_LIFE_TIME, 3080 .preferred_lft = INFINITY_LIFE_TIME, 3081 .scope = scope 3082 }; 3083 3084 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3085 if (!IS_ERR(ifp)) { 3086 spin_lock_bh(&ifp->lock); 3087 ifp->flags &= ~IFA_F_TENTATIVE; 3088 spin_unlock_bh(&ifp->lock); 3089 rt_genid_bump_ipv6(dev_net(idev->dev)); 3090 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3091 in6_ifa_put(ifp); 3092 } 3093 } 3094 3095 #if IS_ENABLED(CONFIG_IPV6_SIT) || IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3096 static void add_v4_addrs(struct inet6_dev *idev) 3097 { 3098 struct in6_addr addr; 3099 struct net_device *dev; 3100 struct net *net = dev_net(idev->dev); 3101 int scope, plen, offset = 0; 3102 u32 pflags = 0; 3103 3104 ASSERT_RTNL(); 3105 3106 memset(&addr, 0, sizeof(struct in6_addr)); 3107 /* in case of IP6GRE the dev_addr is an IPv6 and therefore we use only the last 4 bytes */ 3108 if (idev->dev->addr_len == sizeof(struct in6_addr)) 3109 offset = sizeof(struct in6_addr) - 4; 3110 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr + offset, 4); 3111 3112 if (idev->dev->flags&IFF_POINTOPOINT) { 3113 addr.s6_addr32[0] = htonl(0xfe800000); 3114 scope = IFA_LINK; 3115 plen = 64; 3116 } else { 3117 scope = IPV6_ADDR_COMPATv4; 3118 plen = 96; 3119 pflags |= RTF_NONEXTHOP; 3120 } 3121 3122 if (addr.s6_addr32[3]) { 3123 add_addr(idev, &addr, plen, scope); 3124 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags, 3125 GFP_KERNEL); 3126 return; 3127 } 3128 3129 for_each_netdev(net, dev) { 3130 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3131 if (in_dev && (dev->flags & IFF_UP)) { 3132 struct in_ifaddr *ifa; 3133 int flag = scope; 3134 3135 in_dev_for_each_ifa_rtnl(ifa, in_dev) { 3136 addr.s6_addr32[3] = ifa->ifa_local; 3137 3138 if (ifa->ifa_scope == RT_SCOPE_LINK) 3139 continue; 3140 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3141 if (idev->dev->flags&IFF_POINTOPOINT) 3142 continue; 3143 flag |= IFA_HOST; 3144 } 3145 3146 add_addr(idev, &addr, plen, flag); 3147 addrconf_prefix_route(&addr, plen, 0, idev->dev, 3148 0, pflags, GFP_KERNEL); 3149 } 3150 } 3151 } 3152 } 3153 #endif 3154 3155 static void init_loopback(struct net_device *dev) 3156 { 3157 struct inet6_dev *idev; 3158 3159 /* ::1 */ 3160 3161 ASSERT_RTNL(); 3162 3163 idev = ipv6_find_idev(dev); 3164 if (IS_ERR(idev)) { 3165 pr_debug("%s: add_dev failed\n", __func__); 3166 return; 3167 } 3168 3169 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 3170 } 3171 3172 void addrconf_add_linklocal(struct inet6_dev *idev, 3173 const struct in6_addr *addr, u32 flags) 3174 { 3175 struct ifa6_config cfg = { 3176 .pfx = addr, 3177 .plen = 64, 3178 .ifa_flags = flags | IFA_F_PERMANENT, 3179 .valid_lft = INFINITY_LIFE_TIME, 3180 .preferred_lft = INFINITY_LIFE_TIME, 3181 .scope = IFA_LINK 3182 }; 3183 struct inet6_ifaddr *ifp; 3184 3185 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3186 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad || 3187 idev->cnf.optimistic_dad) && 3188 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3189 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 3190 #endif 3191 3192 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3193 if (!IS_ERR(ifp)) { 3194 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev, 3195 0, 0, GFP_ATOMIC); 3196 addrconf_dad_start(ifp); 3197 in6_ifa_put(ifp); 3198 } 3199 } 3200 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3201 3202 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3203 { 3204 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3205 return true; 3206 3207 if (address.s6_addr32[2] == htonl(0x02005eff) && 3208 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3209 return true; 3210 3211 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3212 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3213 return true; 3214 3215 return false; 3216 } 3217 3218 static int ipv6_generate_stable_address(struct in6_addr *address, 3219 u8 dad_count, 3220 const struct inet6_dev *idev) 3221 { 3222 static DEFINE_SPINLOCK(lock); 3223 static __u32 digest[SHA1_DIGEST_WORDS]; 3224 static __u32 workspace[SHA1_WORKSPACE_WORDS]; 3225 3226 static union { 3227 char __data[SHA1_BLOCK_SIZE]; 3228 struct { 3229 struct in6_addr secret; 3230 __be32 prefix[2]; 3231 unsigned char hwaddr[MAX_ADDR_LEN]; 3232 u8 dad_count; 3233 } __packed; 3234 } data; 3235 3236 struct in6_addr secret; 3237 struct in6_addr temp; 3238 struct net *net = dev_net(idev->dev); 3239 3240 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3241 3242 if (idev->cnf.stable_secret.initialized) 3243 secret = idev->cnf.stable_secret.secret; 3244 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3245 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3246 else 3247 return -1; 3248 3249 retry: 3250 spin_lock_bh(&lock); 3251 3252 sha1_init(digest); 3253 memset(&data, 0, sizeof(data)); 3254 memset(workspace, 0, sizeof(workspace)); 3255 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3256 data.prefix[0] = address->s6_addr32[0]; 3257 data.prefix[1] = address->s6_addr32[1]; 3258 data.secret = secret; 3259 data.dad_count = dad_count; 3260 3261 sha1_transform(digest, data.__data, workspace); 3262 3263 temp = *address; 3264 temp.s6_addr32[2] = (__force __be32)digest[0]; 3265 temp.s6_addr32[3] = (__force __be32)digest[1]; 3266 3267 spin_unlock_bh(&lock); 3268 3269 if (ipv6_reserved_interfaceid(temp)) { 3270 dad_count++; 3271 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3272 return -1; 3273 goto retry; 3274 } 3275 3276 *address = temp; 3277 return 0; 3278 } 3279 3280 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3281 { 3282 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3283 3284 if (s->initialized) 3285 return; 3286 s = &idev->cnf.stable_secret; 3287 get_random_bytes(&s->secret, sizeof(s->secret)); 3288 s->initialized = true; 3289 } 3290 3291 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3292 { 3293 struct in6_addr addr; 3294 3295 /* no link local addresses on L3 master devices */ 3296 if (netif_is_l3_master(idev->dev)) 3297 return; 3298 3299 /* no link local addresses on devices flagged as slaves */ 3300 if (idev->dev->flags & IFF_SLAVE) 3301 return; 3302 3303 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3304 3305 switch (idev->cnf.addr_gen_mode) { 3306 case IN6_ADDR_GEN_MODE_RANDOM: 3307 ipv6_gen_mode_random_init(idev); 3308 fallthrough; 3309 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3310 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3311 addrconf_add_linklocal(idev, &addr, 3312 IFA_F_STABLE_PRIVACY); 3313 else if (prefix_route) 3314 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3315 0, 0, GFP_KERNEL); 3316 break; 3317 case IN6_ADDR_GEN_MODE_EUI64: 3318 /* addrconf_add_linklocal also adds a prefix_route and we 3319 * only need to care about prefix routes if ipv6_generate_eui64 3320 * couldn't generate one. 3321 */ 3322 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3323 addrconf_add_linklocal(idev, &addr, 0); 3324 else if (prefix_route) 3325 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3326 0, 0, GFP_KERNEL); 3327 break; 3328 case IN6_ADDR_GEN_MODE_NONE: 3329 default: 3330 /* will not add any link local address */ 3331 break; 3332 } 3333 } 3334 3335 static void addrconf_dev_config(struct net_device *dev) 3336 { 3337 struct inet6_dev *idev; 3338 3339 ASSERT_RTNL(); 3340 3341 if ((dev->type != ARPHRD_ETHER) && 3342 (dev->type != ARPHRD_FDDI) && 3343 (dev->type != ARPHRD_ARCNET) && 3344 (dev->type != ARPHRD_INFINIBAND) && 3345 (dev->type != ARPHRD_IEEE1394) && 3346 (dev->type != ARPHRD_TUNNEL6) && 3347 (dev->type != ARPHRD_6LOWPAN) && 3348 (dev->type != ARPHRD_TUNNEL) && 3349 (dev->type != ARPHRD_NONE) && 3350 (dev->type != ARPHRD_RAWIP)) { 3351 /* Alas, we support only Ethernet autoconfiguration. */ 3352 idev = __in6_dev_get(dev); 3353 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP && 3354 dev->flags & IFF_MULTICAST) 3355 ipv6_mc_up(idev); 3356 return; 3357 } 3358 3359 idev = addrconf_add_dev(dev); 3360 if (IS_ERR(idev)) 3361 return; 3362 3363 /* this device type has no EUI support */ 3364 if (dev->type == ARPHRD_NONE && 3365 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3366 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3367 3368 addrconf_addr_gen(idev, false); 3369 } 3370 3371 #if IS_ENABLED(CONFIG_IPV6_SIT) 3372 static void addrconf_sit_config(struct net_device *dev) 3373 { 3374 struct inet6_dev *idev; 3375 3376 ASSERT_RTNL(); 3377 3378 /* 3379 * Configure the tunnel with one of our IPv4 3380 * addresses... we should configure all of 3381 * our v4 addrs in the tunnel 3382 */ 3383 3384 idev = ipv6_find_idev(dev); 3385 if (IS_ERR(idev)) { 3386 pr_debug("%s: add_dev failed\n", __func__); 3387 return; 3388 } 3389 3390 if (dev->priv_flags & IFF_ISATAP) { 3391 addrconf_addr_gen(idev, false); 3392 return; 3393 } 3394 3395 add_v4_addrs(idev); 3396 3397 if (dev->flags&IFF_POINTOPOINT) 3398 addrconf_add_mroute(dev); 3399 } 3400 #endif 3401 3402 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3403 static void addrconf_gre_config(struct net_device *dev) 3404 { 3405 struct inet6_dev *idev; 3406 3407 ASSERT_RTNL(); 3408 3409 idev = ipv6_find_idev(dev); 3410 if (IS_ERR(idev)) { 3411 pr_debug("%s: add_dev failed\n", __func__); 3412 return; 3413 } 3414 3415 if (dev->type == ARPHRD_ETHER) { 3416 addrconf_addr_gen(idev, true); 3417 return; 3418 } 3419 3420 add_v4_addrs(idev); 3421 3422 if (dev->flags & IFF_POINTOPOINT) 3423 addrconf_add_mroute(dev); 3424 } 3425 #endif 3426 3427 static int fixup_permanent_addr(struct net *net, 3428 struct inet6_dev *idev, 3429 struct inet6_ifaddr *ifp) 3430 { 3431 /* !fib6_node means the host route was removed from the 3432 * FIB, for example, if 'lo' device is taken down. In that 3433 * case regenerate the host route. 3434 */ 3435 if (!ifp->rt || !ifp->rt->fib6_node) { 3436 struct fib6_info *f6i, *prev; 3437 3438 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false, 3439 GFP_ATOMIC); 3440 if (IS_ERR(f6i)) 3441 return PTR_ERR(f6i); 3442 3443 /* ifp->rt can be accessed outside of rtnl */ 3444 spin_lock(&ifp->lock); 3445 prev = ifp->rt; 3446 ifp->rt = f6i; 3447 spin_unlock(&ifp->lock); 3448 3449 fib6_info_release(prev); 3450 } 3451 3452 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3453 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3454 ifp->rt_priority, idev->dev, 0, 0, 3455 GFP_ATOMIC); 3456 } 3457 3458 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3459 addrconf_dad_start(ifp); 3460 3461 return 0; 3462 } 3463 3464 static void addrconf_permanent_addr(struct net *net, struct net_device *dev) 3465 { 3466 struct inet6_ifaddr *ifp, *tmp; 3467 struct inet6_dev *idev; 3468 3469 idev = __in6_dev_get(dev); 3470 if (!idev) 3471 return; 3472 3473 write_lock_bh(&idev->lock); 3474 3475 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3476 if ((ifp->flags & IFA_F_PERMANENT) && 3477 fixup_permanent_addr(net, idev, ifp) < 0) { 3478 write_unlock_bh(&idev->lock); 3479 in6_ifa_hold(ifp); 3480 ipv6_del_addr(ifp); 3481 write_lock_bh(&idev->lock); 3482 3483 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3484 idev->dev->name, &ifp->addr); 3485 } 3486 } 3487 3488 write_unlock_bh(&idev->lock); 3489 } 3490 3491 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3492 void *ptr) 3493 { 3494 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3495 struct netdev_notifier_change_info *change_info; 3496 struct netdev_notifier_changeupper_info *info; 3497 struct inet6_dev *idev = __in6_dev_get(dev); 3498 struct net *net = dev_net(dev); 3499 int run_pending = 0; 3500 int err; 3501 3502 switch (event) { 3503 case NETDEV_REGISTER: 3504 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3505 idev = ipv6_add_dev(dev); 3506 if (IS_ERR(idev)) 3507 return notifier_from_errno(PTR_ERR(idev)); 3508 } 3509 break; 3510 3511 case NETDEV_CHANGEMTU: 3512 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3513 if (dev->mtu < IPV6_MIN_MTU) { 3514 addrconf_ifdown(dev, dev != net->loopback_dev); 3515 break; 3516 } 3517 3518 if (idev) { 3519 rt6_mtu_change(dev, dev->mtu); 3520 idev->cnf.mtu6 = dev->mtu; 3521 break; 3522 } 3523 3524 /* allocate new idev */ 3525 idev = ipv6_add_dev(dev); 3526 if (IS_ERR(idev)) 3527 break; 3528 3529 /* device is still not ready */ 3530 if (!(idev->if_flags & IF_READY)) 3531 break; 3532 3533 run_pending = 1; 3534 fallthrough; 3535 case NETDEV_UP: 3536 case NETDEV_CHANGE: 3537 if (dev->flags & IFF_SLAVE) 3538 break; 3539 3540 if (idev && idev->cnf.disable_ipv6) 3541 break; 3542 3543 if (event == NETDEV_UP) { 3544 /* restore routes for permanent addresses */ 3545 addrconf_permanent_addr(net, dev); 3546 3547 if (!addrconf_link_ready(dev)) { 3548 /* device is not ready yet. */ 3549 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3550 dev->name); 3551 break; 3552 } 3553 3554 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3555 idev = ipv6_add_dev(dev); 3556 3557 if (!IS_ERR_OR_NULL(idev)) { 3558 idev->if_flags |= IF_READY; 3559 run_pending = 1; 3560 } 3561 } else if (event == NETDEV_CHANGE) { 3562 if (!addrconf_link_ready(dev)) { 3563 /* device is still not ready. */ 3564 rt6_sync_down_dev(dev, event); 3565 break; 3566 } 3567 3568 if (!IS_ERR_OR_NULL(idev)) { 3569 if (idev->if_flags & IF_READY) { 3570 /* device is already configured - 3571 * but resend MLD reports, we might 3572 * have roamed and need to update 3573 * multicast snooping switches 3574 */ 3575 ipv6_mc_up(idev); 3576 change_info = ptr; 3577 if (change_info->flags_changed & IFF_NOARP) 3578 addrconf_dad_run(idev, true); 3579 rt6_sync_up(dev, RTNH_F_LINKDOWN); 3580 break; 3581 } 3582 idev->if_flags |= IF_READY; 3583 } 3584 3585 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3586 dev->name); 3587 3588 run_pending = 1; 3589 } 3590 3591 switch (dev->type) { 3592 #if IS_ENABLED(CONFIG_IPV6_SIT) 3593 case ARPHRD_SIT: 3594 addrconf_sit_config(dev); 3595 break; 3596 #endif 3597 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3598 case ARPHRD_IP6GRE: 3599 case ARPHRD_IPGRE: 3600 addrconf_gre_config(dev); 3601 break; 3602 #endif 3603 case ARPHRD_LOOPBACK: 3604 init_loopback(dev); 3605 break; 3606 3607 default: 3608 addrconf_dev_config(dev); 3609 break; 3610 } 3611 3612 if (!IS_ERR_OR_NULL(idev)) { 3613 if (run_pending) 3614 addrconf_dad_run(idev, false); 3615 3616 /* Device has an address by now */ 3617 rt6_sync_up(dev, RTNH_F_DEAD); 3618 3619 /* 3620 * If the MTU changed during the interface down, 3621 * when the interface up, the changed MTU must be 3622 * reflected in the idev as well as routers. 3623 */ 3624 if (idev->cnf.mtu6 != dev->mtu && 3625 dev->mtu >= IPV6_MIN_MTU) { 3626 rt6_mtu_change(dev, dev->mtu); 3627 idev->cnf.mtu6 = dev->mtu; 3628 } 3629 idev->tstamp = jiffies; 3630 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3631 3632 /* 3633 * If the changed mtu during down is lower than 3634 * IPV6_MIN_MTU stop IPv6 on this interface. 3635 */ 3636 if (dev->mtu < IPV6_MIN_MTU) 3637 addrconf_ifdown(dev, dev != net->loopback_dev); 3638 } 3639 break; 3640 3641 case NETDEV_DOWN: 3642 case NETDEV_UNREGISTER: 3643 /* 3644 * Remove all addresses from this interface. 3645 */ 3646 addrconf_ifdown(dev, event != NETDEV_DOWN); 3647 break; 3648 3649 case NETDEV_CHANGENAME: 3650 if (idev) { 3651 snmp6_unregister_dev(idev); 3652 addrconf_sysctl_unregister(idev); 3653 err = addrconf_sysctl_register(idev); 3654 if (err) 3655 return notifier_from_errno(err); 3656 err = snmp6_register_dev(idev); 3657 if (err) { 3658 addrconf_sysctl_unregister(idev); 3659 return notifier_from_errno(err); 3660 } 3661 } 3662 break; 3663 3664 case NETDEV_PRE_TYPE_CHANGE: 3665 case NETDEV_POST_TYPE_CHANGE: 3666 if (idev) 3667 addrconf_type_change(dev, event); 3668 break; 3669 3670 case NETDEV_CHANGEUPPER: 3671 info = ptr; 3672 3673 /* flush all routes if dev is linked to or unlinked from 3674 * an L3 master device (e.g., VRF) 3675 */ 3676 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3677 addrconf_ifdown(dev, false); 3678 } 3679 3680 return NOTIFY_OK; 3681 } 3682 3683 /* 3684 * addrconf module should be notified of a device going up 3685 */ 3686 static struct notifier_block ipv6_dev_notf = { 3687 .notifier_call = addrconf_notify, 3688 .priority = ADDRCONF_NOTIFY_PRIORITY, 3689 }; 3690 3691 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3692 { 3693 struct inet6_dev *idev; 3694 ASSERT_RTNL(); 3695 3696 idev = __in6_dev_get(dev); 3697 3698 if (event == NETDEV_POST_TYPE_CHANGE) 3699 ipv6_mc_remap(idev); 3700 else if (event == NETDEV_PRE_TYPE_CHANGE) 3701 ipv6_mc_unmap(idev); 3702 } 3703 3704 static bool addr_is_local(const struct in6_addr *addr) 3705 { 3706 return ipv6_addr_type(addr) & 3707 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3708 } 3709 3710 static int addrconf_ifdown(struct net_device *dev, bool unregister) 3711 { 3712 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN; 3713 struct net *net = dev_net(dev); 3714 struct inet6_dev *idev; 3715 struct inet6_ifaddr *ifa, *tmp; 3716 bool keep_addr = false; 3717 int state, i; 3718 3719 ASSERT_RTNL(); 3720 3721 rt6_disable_ip(dev, event); 3722 3723 idev = __in6_dev_get(dev); 3724 if (!idev) 3725 return -ENODEV; 3726 3727 /* 3728 * Step 1: remove reference to ipv6 device from parent device. 3729 * Do not dev_put! 3730 */ 3731 if (unregister) { 3732 idev->dead = 1; 3733 3734 /* protected by rtnl_lock */ 3735 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3736 3737 /* Step 1.5: remove snmp6 entry */ 3738 snmp6_unregister_dev(idev); 3739 3740 } 3741 3742 /* combine the user config with event to determine if permanent 3743 * addresses are to be removed from address hash table 3744 */ 3745 if (!unregister && !idev->cnf.disable_ipv6) { 3746 /* aggregate the system setting and interface setting */ 3747 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3748 3749 if (!_keep_addr) 3750 _keep_addr = idev->cnf.keep_addr_on_down; 3751 3752 keep_addr = (_keep_addr > 0); 3753 } 3754 3755 /* Step 2: clear hash table */ 3756 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3757 struct hlist_head *h = &inet6_addr_lst[i]; 3758 3759 spin_lock_bh(&addrconf_hash_lock); 3760 restart: 3761 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3762 if (ifa->idev == idev) { 3763 addrconf_del_dad_work(ifa); 3764 /* combined flag + permanent flag decide if 3765 * address is retained on a down event 3766 */ 3767 if (!keep_addr || 3768 !(ifa->flags & IFA_F_PERMANENT) || 3769 addr_is_local(&ifa->addr)) { 3770 hlist_del_init_rcu(&ifa->addr_lst); 3771 goto restart; 3772 } 3773 } 3774 } 3775 spin_unlock_bh(&addrconf_hash_lock); 3776 } 3777 3778 write_lock_bh(&idev->lock); 3779 3780 addrconf_del_rs_timer(idev); 3781 3782 /* Step 2: clear flags for stateless addrconf */ 3783 if (!unregister) 3784 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3785 3786 /* Step 3: clear tempaddr list */ 3787 while (!list_empty(&idev->tempaddr_list)) { 3788 ifa = list_first_entry(&idev->tempaddr_list, 3789 struct inet6_ifaddr, tmp_list); 3790 list_del(&ifa->tmp_list); 3791 write_unlock_bh(&idev->lock); 3792 spin_lock_bh(&ifa->lock); 3793 3794 if (ifa->ifpub) { 3795 in6_ifa_put(ifa->ifpub); 3796 ifa->ifpub = NULL; 3797 } 3798 spin_unlock_bh(&ifa->lock); 3799 in6_ifa_put(ifa); 3800 write_lock_bh(&idev->lock); 3801 } 3802 3803 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3804 struct fib6_info *rt = NULL; 3805 bool keep; 3806 3807 addrconf_del_dad_work(ifa); 3808 3809 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3810 !addr_is_local(&ifa->addr); 3811 3812 write_unlock_bh(&idev->lock); 3813 spin_lock_bh(&ifa->lock); 3814 3815 if (keep) { 3816 /* set state to skip the notifier below */ 3817 state = INET6_IFADDR_STATE_DEAD; 3818 ifa->state = INET6_IFADDR_STATE_PREDAD; 3819 if (!(ifa->flags & IFA_F_NODAD)) 3820 ifa->flags |= IFA_F_TENTATIVE; 3821 3822 rt = ifa->rt; 3823 ifa->rt = NULL; 3824 } else { 3825 state = ifa->state; 3826 ifa->state = INET6_IFADDR_STATE_DEAD; 3827 } 3828 3829 spin_unlock_bh(&ifa->lock); 3830 3831 if (rt) 3832 ip6_del_rt(net, rt, false); 3833 3834 if (state != INET6_IFADDR_STATE_DEAD) { 3835 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3836 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3837 } else { 3838 if (idev->cnf.forwarding) 3839 addrconf_leave_anycast(ifa); 3840 addrconf_leave_solict(ifa->idev, &ifa->addr); 3841 } 3842 3843 write_lock_bh(&idev->lock); 3844 if (!keep) { 3845 list_del_rcu(&ifa->if_list); 3846 in6_ifa_put(ifa); 3847 } 3848 } 3849 3850 write_unlock_bh(&idev->lock); 3851 3852 /* Step 5: Discard anycast and multicast list */ 3853 if (unregister) { 3854 ipv6_ac_destroy_dev(idev); 3855 ipv6_mc_destroy_dev(idev); 3856 } else { 3857 ipv6_mc_down(idev); 3858 } 3859 3860 idev->tstamp = jiffies; 3861 idev->ra_mtu = 0; 3862 3863 /* Last: Shot the device (if unregistered) */ 3864 if (unregister) { 3865 addrconf_sysctl_unregister(idev); 3866 neigh_parms_release(&nd_tbl, idev->nd_parms); 3867 neigh_ifdown(&nd_tbl, dev); 3868 in6_dev_put(idev); 3869 } 3870 return 0; 3871 } 3872 3873 static void addrconf_rs_timer(struct timer_list *t) 3874 { 3875 struct inet6_dev *idev = from_timer(idev, t, rs_timer); 3876 struct net_device *dev = idev->dev; 3877 struct in6_addr lladdr; 3878 3879 write_lock(&idev->lock); 3880 if (idev->dead || !(idev->if_flags & IF_READY)) 3881 goto out; 3882 3883 if (!ipv6_accept_ra(idev)) 3884 goto out; 3885 3886 /* Announcement received after solicitation was sent */ 3887 if (idev->if_flags & IF_RA_RCVD) 3888 goto out; 3889 3890 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3891 write_unlock(&idev->lock); 3892 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3893 ndisc_send_rs(dev, &lladdr, 3894 &in6addr_linklocal_allrouters); 3895 else 3896 goto put; 3897 3898 write_lock(&idev->lock); 3899 idev->rs_interval = rfc3315_s14_backoff_update( 3900 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3901 /* The wait after the last probe can be shorter */ 3902 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3903 idev->cnf.rtr_solicits) ? 3904 idev->cnf.rtr_solicit_delay : 3905 idev->rs_interval); 3906 } else { 3907 /* 3908 * Note: we do not support deprecated "all on-link" 3909 * assumption any longer. 3910 */ 3911 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3912 } 3913 3914 out: 3915 write_unlock(&idev->lock); 3916 put: 3917 in6_dev_put(idev); 3918 } 3919 3920 /* 3921 * Duplicate Address Detection 3922 */ 3923 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3924 { 3925 unsigned long rand_num; 3926 struct inet6_dev *idev = ifp->idev; 3927 u64 nonce; 3928 3929 if (ifp->flags & IFA_F_OPTIMISTIC) 3930 rand_num = 0; 3931 else 3932 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3933 3934 nonce = 0; 3935 if (idev->cnf.enhanced_dad || 3936 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 3937 do 3938 get_random_bytes(&nonce, 6); 3939 while (nonce == 0); 3940 } 3941 ifp->dad_nonce = nonce; 3942 ifp->dad_probes = idev->cnf.dad_transmits; 3943 addrconf_mod_dad_work(ifp, rand_num); 3944 } 3945 3946 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3947 { 3948 struct inet6_dev *idev = ifp->idev; 3949 struct net_device *dev = idev->dev; 3950 bool bump_id, notify = false; 3951 struct net *net; 3952 3953 addrconf_join_solict(dev, &ifp->addr); 3954 3955 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3956 3957 read_lock_bh(&idev->lock); 3958 spin_lock(&ifp->lock); 3959 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3960 goto out; 3961 3962 net = dev_net(dev); 3963 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3964 (net->ipv6.devconf_all->accept_dad < 1 && 3965 idev->cnf.accept_dad < 1) || 3966 !(ifp->flags&IFA_F_TENTATIVE) || 3967 ifp->flags & IFA_F_NODAD) { 3968 bool send_na = false; 3969 3970 if (ifp->flags & IFA_F_TENTATIVE && 3971 !(ifp->flags & IFA_F_OPTIMISTIC)) 3972 send_na = true; 3973 bump_id = ifp->flags & IFA_F_TENTATIVE; 3974 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3975 spin_unlock(&ifp->lock); 3976 read_unlock_bh(&idev->lock); 3977 3978 addrconf_dad_completed(ifp, bump_id, send_na); 3979 return; 3980 } 3981 3982 if (!(idev->if_flags & IF_READY)) { 3983 spin_unlock(&ifp->lock); 3984 read_unlock_bh(&idev->lock); 3985 /* 3986 * If the device is not ready: 3987 * - keep it tentative if it is a permanent address. 3988 * - otherwise, kill it. 3989 */ 3990 in6_ifa_hold(ifp); 3991 addrconf_dad_stop(ifp, 0); 3992 return; 3993 } 3994 3995 /* 3996 * Optimistic nodes can start receiving 3997 * Frames right away 3998 */ 3999 if (ifp->flags & IFA_F_OPTIMISTIC) { 4000 ip6_ins_rt(net, ifp->rt); 4001 if (ipv6_use_optimistic_addr(net, idev)) { 4002 /* Because optimistic nodes can use this address, 4003 * notify listeners. If DAD fails, RTM_DELADDR is sent. 4004 */ 4005 notify = true; 4006 } 4007 } 4008 4009 addrconf_dad_kick(ifp); 4010 out: 4011 spin_unlock(&ifp->lock); 4012 read_unlock_bh(&idev->lock); 4013 if (notify) 4014 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4015 } 4016 4017 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 4018 { 4019 bool begin_dad = false; 4020 4021 spin_lock_bh(&ifp->lock); 4022 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 4023 ifp->state = INET6_IFADDR_STATE_PREDAD; 4024 begin_dad = true; 4025 } 4026 spin_unlock_bh(&ifp->lock); 4027 4028 if (begin_dad) 4029 addrconf_mod_dad_work(ifp, 0); 4030 } 4031 4032 static void addrconf_dad_work(struct work_struct *w) 4033 { 4034 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 4035 struct inet6_ifaddr, 4036 dad_work); 4037 struct inet6_dev *idev = ifp->idev; 4038 bool bump_id, disable_ipv6 = false; 4039 struct in6_addr mcaddr; 4040 4041 enum { 4042 DAD_PROCESS, 4043 DAD_BEGIN, 4044 DAD_ABORT, 4045 } action = DAD_PROCESS; 4046 4047 rtnl_lock(); 4048 4049 spin_lock_bh(&ifp->lock); 4050 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 4051 action = DAD_BEGIN; 4052 ifp->state = INET6_IFADDR_STATE_DAD; 4053 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 4054 action = DAD_ABORT; 4055 ifp->state = INET6_IFADDR_STATE_POSTDAD; 4056 4057 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 || 4058 idev->cnf.accept_dad > 1) && 4059 !idev->cnf.disable_ipv6 && 4060 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 4061 struct in6_addr addr; 4062 4063 addr.s6_addr32[0] = htonl(0xfe800000); 4064 addr.s6_addr32[1] = 0; 4065 4066 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 4067 ipv6_addr_equal(&ifp->addr, &addr)) { 4068 /* DAD failed for link-local based on MAC */ 4069 idev->cnf.disable_ipv6 = 1; 4070 4071 pr_info("%s: IPv6 being disabled!\n", 4072 ifp->idev->dev->name); 4073 disable_ipv6 = true; 4074 } 4075 } 4076 } 4077 spin_unlock_bh(&ifp->lock); 4078 4079 if (action == DAD_BEGIN) { 4080 addrconf_dad_begin(ifp); 4081 goto out; 4082 } else if (action == DAD_ABORT) { 4083 in6_ifa_hold(ifp); 4084 addrconf_dad_stop(ifp, 1); 4085 if (disable_ipv6) 4086 addrconf_ifdown(idev->dev, false); 4087 goto out; 4088 } 4089 4090 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 4091 goto out; 4092 4093 write_lock_bh(&idev->lock); 4094 if (idev->dead || !(idev->if_flags & IF_READY)) { 4095 write_unlock_bh(&idev->lock); 4096 goto out; 4097 } 4098 4099 spin_lock(&ifp->lock); 4100 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 4101 spin_unlock(&ifp->lock); 4102 write_unlock_bh(&idev->lock); 4103 goto out; 4104 } 4105 4106 if (ifp->dad_probes == 0) { 4107 bool send_na = false; 4108 4109 /* 4110 * DAD was successful 4111 */ 4112 4113 if (ifp->flags & IFA_F_TENTATIVE && 4114 !(ifp->flags & IFA_F_OPTIMISTIC)) 4115 send_na = true; 4116 bump_id = ifp->flags & IFA_F_TENTATIVE; 4117 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4118 spin_unlock(&ifp->lock); 4119 write_unlock_bh(&idev->lock); 4120 4121 addrconf_dad_completed(ifp, bump_id, send_na); 4122 4123 goto out; 4124 } 4125 4126 ifp->dad_probes--; 4127 addrconf_mod_dad_work(ifp, 4128 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), 4129 HZ/100)); 4130 spin_unlock(&ifp->lock); 4131 write_unlock_bh(&idev->lock); 4132 4133 /* send a neighbour solicitation for our addr */ 4134 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 4135 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 4136 ifp->dad_nonce); 4137 out: 4138 in6_ifa_put(ifp); 4139 rtnl_unlock(); 4140 } 4141 4142 /* ifp->idev must be at least read locked */ 4143 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4144 { 4145 struct inet6_ifaddr *ifpiter; 4146 struct inet6_dev *idev = ifp->idev; 4147 4148 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4149 if (ifpiter->scope > IFA_LINK) 4150 break; 4151 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4152 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4153 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4154 IFA_F_PERMANENT) 4155 return false; 4156 } 4157 return true; 4158 } 4159 4160 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 4161 bool send_na) 4162 { 4163 struct net_device *dev = ifp->idev->dev; 4164 struct in6_addr lladdr; 4165 bool send_rs, send_mld; 4166 4167 addrconf_del_dad_work(ifp); 4168 4169 /* 4170 * Configure the address for reception. Now it is valid. 4171 */ 4172 4173 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4174 4175 /* If added prefix is link local and we are prepared to process 4176 router advertisements, start sending router solicitations. 4177 */ 4178 4179 read_lock_bh(&ifp->idev->lock); 4180 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4181 send_rs = send_mld && 4182 ipv6_accept_ra(ifp->idev) && 4183 ifp->idev->cnf.rtr_solicits != 0 && 4184 (dev->flags&IFF_LOOPBACK) == 0; 4185 read_unlock_bh(&ifp->idev->lock); 4186 4187 /* While dad is in progress mld report's source address is in6_addrany. 4188 * Resend with proper ll now. 4189 */ 4190 if (send_mld) 4191 ipv6_mc_dad_complete(ifp->idev); 4192 4193 /* send unsolicited NA if enabled */ 4194 if (send_na && 4195 (ifp->idev->cnf.ndisc_notify || 4196 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) { 4197 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr, 4198 /*router=*/ !!ifp->idev->cnf.forwarding, 4199 /*solicited=*/ false, /*override=*/ true, 4200 /*inc_opt=*/ true); 4201 } 4202 4203 if (send_rs) { 4204 /* 4205 * If a host as already performed a random delay 4206 * [...] as part of DAD [...] there is no need 4207 * to delay again before sending the first RS 4208 */ 4209 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4210 return; 4211 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4212 4213 write_lock_bh(&ifp->idev->lock); 4214 spin_lock(&ifp->lock); 4215 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4216 ifp->idev->cnf.rtr_solicit_interval); 4217 ifp->idev->rs_probes = 1; 4218 ifp->idev->if_flags |= IF_RS_SENT; 4219 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4220 spin_unlock(&ifp->lock); 4221 write_unlock_bh(&ifp->idev->lock); 4222 } 4223 4224 if (bump_id) 4225 rt_genid_bump_ipv6(dev_net(dev)); 4226 4227 /* Make sure that a new temporary address will be created 4228 * before this temporary address becomes deprecated. 4229 */ 4230 if (ifp->flags & IFA_F_TEMPORARY) 4231 addrconf_verify_rtnl(); 4232 } 4233 4234 static void addrconf_dad_run(struct inet6_dev *idev, bool restart) 4235 { 4236 struct inet6_ifaddr *ifp; 4237 4238 read_lock_bh(&idev->lock); 4239 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4240 spin_lock(&ifp->lock); 4241 if ((ifp->flags & IFA_F_TENTATIVE && 4242 ifp->state == INET6_IFADDR_STATE_DAD) || restart) { 4243 if (restart) 4244 ifp->state = INET6_IFADDR_STATE_PREDAD; 4245 addrconf_dad_kick(ifp); 4246 } 4247 spin_unlock(&ifp->lock); 4248 } 4249 read_unlock_bh(&idev->lock); 4250 } 4251 4252 #ifdef CONFIG_PROC_FS 4253 struct if6_iter_state { 4254 struct seq_net_private p; 4255 int bucket; 4256 int offset; 4257 }; 4258 4259 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4260 { 4261 struct if6_iter_state *state = seq->private; 4262 struct net *net = seq_file_net(seq); 4263 struct inet6_ifaddr *ifa = NULL; 4264 int p = 0; 4265 4266 /* initial bucket if pos is 0 */ 4267 if (pos == 0) { 4268 state->bucket = 0; 4269 state->offset = 0; 4270 } 4271 4272 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4273 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket], 4274 addr_lst) { 4275 if (!net_eq(dev_net(ifa->idev->dev), net)) 4276 continue; 4277 /* sync with offset */ 4278 if (p < state->offset) { 4279 p++; 4280 continue; 4281 } 4282 return ifa; 4283 } 4284 4285 /* prepare for next bucket */ 4286 state->offset = 0; 4287 p = 0; 4288 } 4289 return NULL; 4290 } 4291 4292 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4293 struct inet6_ifaddr *ifa) 4294 { 4295 struct if6_iter_state *state = seq->private; 4296 struct net *net = seq_file_net(seq); 4297 4298 hlist_for_each_entry_continue_rcu(ifa, addr_lst) { 4299 if (!net_eq(dev_net(ifa->idev->dev), net)) 4300 continue; 4301 state->offset++; 4302 return ifa; 4303 } 4304 4305 state->offset = 0; 4306 while (++state->bucket < IN6_ADDR_HSIZE) { 4307 hlist_for_each_entry_rcu(ifa, 4308 &inet6_addr_lst[state->bucket], addr_lst) { 4309 if (!net_eq(dev_net(ifa->idev->dev), net)) 4310 continue; 4311 return ifa; 4312 } 4313 } 4314 4315 return NULL; 4316 } 4317 4318 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4319 __acquires(rcu) 4320 { 4321 rcu_read_lock(); 4322 return if6_get_first(seq, *pos); 4323 } 4324 4325 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4326 { 4327 struct inet6_ifaddr *ifa; 4328 4329 ifa = if6_get_next(seq, v); 4330 ++*pos; 4331 return ifa; 4332 } 4333 4334 static void if6_seq_stop(struct seq_file *seq, void *v) 4335 __releases(rcu) 4336 { 4337 rcu_read_unlock(); 4338 } 4339 4340 static int if6_seq_show(struct seq_file *seq, void *v) 4341 { 4342 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4343 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4344 &ifp->addr, 4345 ifp->idev->dev->ifindex, 4346 ifp->prefix_len, 4347 ifp->scope, 4348 (u8) ifp->flags, 4349 ifp->idev->dev->name); 4350 return 0; 4351 } 4352 4353 static const struct seq_operations if6_seq_ops = { 4354 .start = if6_seq_start, 4355 .next = if6_seq_next, 4356 .show = if6_seq_show, 4357 .stop = if6_seq_stop, 4358 }; 4359 4360 static int __net_init if6_proc_net_init(struct net *net) 4361 { 4362 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops, 4363 sizeof(struct if6_iter_state))) 4364 return -ENOMEM; 4365 return 0; 4366 } 4367 4368 static void __net_exit if6_proc_net_exit(struct net *net) 4369 { 4370 remove_proc_entry("if_inet6", net->proc_net); 4371 } 4372 4373 static struct pernet_operations if6_proc_net_ops = { 4374 .init = if6_proc_net_init, 4375 .exit = if6_proc_net_exit, 4376 }; 4377 4378 int __init if6_proc_init(void) 4379 { 4380 return register_pernet_subsys(&if6_proc_net_ops); 4381 } 4382 4383 void if6_proc_exit(void) 4384 { 4385 unregister_pernet_subsys(&if6_proc_net_ops); 4386 } 4387 #endif /* CONFIG_PROC_FS */ 4388 4389 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4390 /* Check if address is a home address configured on any interface. */ 4391 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4392 { 4393 unsigned int hash = inet6_addr_hash(net, addr); 4394 struct inet6_ifaddr *ifp = NULL; 4395 int ret = 0; 4396 4397 rcu_read_lock(); 4398 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 4399 if (!net_eq(dev_net(ifp->idev->dev), net)) 4400 continue; 4401 if (ipv6_addr_equal(&ifp->addr, addr) && 4402 (ifp->flags & IFA_F_HOMEADDRESS)) { 4403 ret = 1; 4404 break; 4405 } 4406 } 4407 rcu_read_unlock(); 4408 return ret; 4409 } 4410 #endif 4411 4412 /* RFC6554 has some algorithm to avoid loops in segment routing by 4413 * checking if the segments contains any of a local interface address. 4414 * 4415 * Quote: 4416 * 4417 * To detect loops in the SRH, a router MUST determine if the SRH 4418 * includes multiple addresses assigned to any interface on that router. 4419 * If such addresses appear more than once and are separated by at least 4420 * one address not assigned to that router. 4421 */ 4422 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs, 4423 unsigned char nsegs) 4424 { 4425 const struct in6_addr *addr; 4426 int i, ret = 0, found = 0; 4427 struct inet6_ifaddr *ifp; 4428 bool separated = false; 4429 unsigned int hash; 4430 bool hash_found; 4431 4432 rcu_read_lock(); 4433 for (i = 0; i < nsegs; i++) { 4434 addr = &segs[i]; 4435 hash = inet6_addr_hash(net, addr); 4436 4437 hash_found = false; 4438 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 4439 if (!net_eq(dev_net(ifp->idev->dev), net)) 4440 continue; 4441 4442 if (ipv6_addr_equal(&ifp->addr, addr)) { 4443 hash_found = true; 4444 break; 4445 } 4446 } 4447 4448 if (hash_found) { 4449 if (found > 1 && separated) { 4450 ret = 1; 4451 break; 4452 } 4453 4454 separated = false; 4455 found++; 4456 } else { 4457 separated = true; 4458 } 4459 } 4460 rcu_read_unlock(); 4461 4462 return ret; 4463 } 4464 4465 /* 4466 * Periodic address status verification 4467 */ 4468 4469 static void addrconf_verify_rtnl(void) 4470 { 4471 unsigned long now, next, next_sec, next_sched; 4472 struct inet6_ifaddr *ifp; 4473 int i; 4474 4475 ASSERT_RTNL(); 4476 4477 rcu_read_lock_bh(); 4478 now = jiffies; 4479 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4480 4481 cancel_delayed_work(&addr_chk_work); 4482 4483 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4484 restart: 4485 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4486 unsigned long age; 4487 4488 /* When setting preferred_lft to a value not zero or 4489 * infinity, while valid_lft is infinity 4490 * IFA_F_PERMANENT has a non-infinity life time. 4491 */ 4492 if ((ifp->flags & IFA_F_PERMANENT) && 4493 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4494 continue; 4495 4496 spin_lock(&ifp->lock); 4497 /* We try to batch several events at once. */ 4498 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4499 4500 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4501 age >= ifp->valid_lft) { 4502 spin_unlock(&ifp->lock); 4503 in6_ifa_hold(ifp); 4504 rcu_read_unlock_bh(); 4505 ipv6_del_addr(ifp); 4506 rcu_read_lock_bh(); 4507 goto restart; 4508 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4509 spin_unlock(&ifp->lock); 4510 continue; 4511 } else if (age >= ifp->prefered_lft) { 4512 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4513 int deprecate = 0; 4514 4515 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4516 deprecate = 1; 4517 ifp->flags |= IFA_F_DEPRECATED; 4518 } 4519 4520 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4521 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4522 next = ifp->tstamp + ifp->valid_lft * HZ; 4523 4524 spin_unlock(&ifp->lock); 4525 4526 if (deprecate) { 4527 in6_ifa_hold(ifp); 4528 4529 ipv6_ifa_notify(0, ifp); 4530 in6_ifa_put(ifp); 4531 goto restart; 4532 } 4533 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4534 !(ifp->flags&IFA_F_TENTATIVE)) { 4535 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4536 ifp->idev->cnf.dad_transmits * 4537 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 4538 4539 if (age >= ifp->prefered_lft - regen_advance) { 4540 struct inet6_ifaddr *ifpub = ifp->ifpub; 4541 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4542 next = ifp->tstamp + ifp->prefered_lft * HZ; 4543 if (!ifp->regen_count && ifpub) { 4544 ifp->regen_count++; 4545 in6_ifa_hold(ifp); 4546 in6_ifa_hold(ifpub); 4547 spin_unlock(&ifp->lock); 4548 4549 spin_lock(&ifpub->lock); 4550 ifpub->regen_count = 0; 4551 spin_unlock(&ifpub->lock); 4552 rcu_read_unlock_bh(); 4553 ipv6_create_tempaddr(ifpub, true); 4554 in6_ifa_put(ifpub); 4555 in6_ifa_put(ifp); 4556 rcu_read_lock_bh(); 4557 goto restart; 4558 } 4559 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4560 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4561 spin_unlock(&ifp->lock); 4562 } else { 4563 /* ifp->prefered_lft <= ifp->valid_lft */ 4564 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4565 next = ifp->tstamp + ifp->prefered_lft * HZ; 4566 spin_unlock(&ifp->lock); 4567 } 4568 } 4569 } 4570 4571 next_sec = round_jiffies_up(next); 4572 next_sched = next; 4573 4574 /* If rounded timeout is accurate enough, accept it. */ 4575 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4576 next_sched = next_sec; 4577 4578 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4579 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4580 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4581 4582 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4583 now, next, next_sec, next_sched); 4584 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4585 rcu_read_unlock_bh(); 4586 } 4587 4588 static void addrconf_verify_work(struct work_struct *w) 4589 { 4590 rtnl_lock(); 4591 addrconf_verify_rtnl(); 4592 rtnl_unlock(); 4593 } 4594 4595 static void addrconf_verify(void) 4596 { 4597 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4598 } 4599 4600 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4601 struct in6_addr **peer_pfx) 4602 { 4603 struct in6_addr *pfx = NULL; 4604 4605 *peer_pfx = NULL; 4606 4607 if (addr) 4608 pfx = nla_data(addr); 4609 4610 if (local) { 4611 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4612 *peer_pfx = pfx; 4613 pfx = nla_data(local); 4614 } 4615 4616 return pfx; 4617 } 4618 4619 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4620 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4621 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4622 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4623 [IFA_FLAGS] = { .len = sizeof(u32) }, 4624 [IFA_RT_PRIORITY] = { .len = sizeof(u32) }, 4625 [IFA_TARGET_NETNSID] = { .type = NLA_S32 }, 4626 }; 4627 4628 static int 4629 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4630 struct netlink_ext_ack *extack) 4631 { 4632 struct net *net = sock_net(skb->sk); 4633 struct ifaddrmsg *ifm; 4634 struct nlattr *tb[IFA_MAX+1]; 4635 struct in6_addr *pfx, *peer_pfx; 4636 u32 ifa_flags; 4637 int err; 4638 4639 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4640 ifa_ipv6_policy, extack); 4641 if (err < 0) 4642 return err; 4643 4644 ifm = nlmsg_data(nlh); 4645 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4646 if (!pfx) 4647 return -EINVAL; 4648 4649 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4650 4651 /* We ignore other flags so far. */ 4652 ifa_flags &= IFA_F_MANAGETEMPADDR; 4653 4654 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4655 ifm->ifa_prefixlen); 4656 } 4657 4658 static int modify_prefix_route(struct inet6_ifaddr *ifp, 4659 unsigned long expires, u32 flags, 4660 bool modify_peer) 4661 { 4662 struct fib6_info *f6i; 4663 u32 prio; 4664 4665 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4666 ifp->prefix_len, 4667 ifp->idev->dev, 0, RTF_DEFAULT, true); 4668 if (!f6i) 4669 return -ENOENT; 4670 4671 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF; 4672 if (f6i->fib6_metric != prio) { 4673 /* delete old one */ 4674 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 4675 4676 /* add new one */ 4677 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4678 ifp->prefix_len, 4679 ifp->rt_priority, ifp->idev->dev, 4680 expires, flags, GFP_KERNEL); 4681 } else { 4682 if (!expires) 4683 fib6_clean_expires(f6i); 4684 else 4685 fib6_set_expires(f6i, expires); 4686 4687 fib6_info_release(f6i); 4688 } 4689 4690 return 0; 4691 } 4692 4693 static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg) 4694 { 4695 u32 flags; 4696 clock_t expires; 4697 unsigned long timeout; 4698 bool was_managetempaddr; 4699 bool had_prefixroute; 4700 bool new_peer = false; 4701 4702 ASSERT_RTNL(); 4703 4704 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 4705 return -EINVAL; 4706 4707 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && 4708 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4709 return -EINVAL; 4710 4711 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED) 4712 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC; 4713 4714 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 4715 if (addrconf_finite_timeout(timeout)) { 4716 expires = jiffies_to_clock_t(timeout * HZ); 4717 cfg->valid_lft = timeout; 4718 flags = RTF_EXPIRES; 4719 } else { 4720 expires = 0; 4721 flags = 0; 4722 cfg->ifa_flags |= IFA_F_PERMANENT; 4723 } 4724 4725 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 4726 if (addrconf_finite_timeout(timeout)) { 4727 if (timeout == 0) 4728 cfg->ifa_flags |= IFA_F_DEPRECATED; 4729 cfg->preferred_lft = timeout; 4730 } 4731 4732 if (cfg->peer_pfx && 4733 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) { 4734 if (!ipv6_addr_any(&ifp->peer_addr)) 4735 cleanup_prefix_route(ifp, expires, true, true); 4736 new_peer = true; 4737 } 4738 4739 spin_lock_bh(&ifp->lock); 4740 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4741 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4742 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4743 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4744 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4745 IFA_F_NOPREFIXROUTE); 4746 ifp->flags |= cfg->ifa_flags; 4747 ifp->tstamp = jiffies; 4748 ifp->valid_lft = cfg->valid_lft; 4749 ifp->prefered_lft = cfg->preferred_lft; 4750 4751 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority) 4752 ifp->rt_priority = cfg->rt_priority; 4753 4754 if (new_peer) 4755 ifp->peer_addr = *cfg->peer_pfx; 4756 4757 spin_unlock_bh(&ifp->lock); 4758 if (!(ifp->flags&IFA_F_TENTATIVE)) 4759 ipv6_ifa_notify(0, ifp); 4760 4761 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 4762 int rc = -ENOENT; 4763 4764 if (had_prefixroute) 4765 rc = modify_prefix_route(ifp, expires, flags, false); 4766 4767 /* prefix route could have been deleted; if so restore it */ 4768 if (rc == -ENOENT) { 4769 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4770 ifp->rt_priority, ifp->idev->dev, 4771 expires, flags, GFP_KERNEL); 4772 } 4773 4774 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr)) 4775 rc = modify_prefix_route(ifp, expires, flags, true); 4776 4777 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) { 4778 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len, 4779 ifp->rt_priority, ifp->idev->dev, 4780 expires, flags, GFP_KERNEL); 4781 } 4782 } else if (had_prefixroute) { 4783 enum cleanup_prefix_rt_t action; 4784 unsigned long rt_expires; 4785 4786 write_lock_bh(&ifp->idev->lock); 4787 action = check_cleanup_prefix_route(ifp, &rt_expires); 4788 write_unlock_bh(&ifp->idev->lock); 4789 4790 if (action != CLEANUP_PREFIX_RT_NOP) { 4791 cleanup_prefix_route(ifp, rt_expires, 4792 action == CLEANUP_PREFIX_RT_DEL, false); 4793 } 4794 } 4795 4796 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4797 if (was_managetempaddr && 4798 !(ifp->flags & IFA_F_MANAGETEMPADDR)) { 4799 cfg->valid_lft = 0; 4800 cfg->preferred_lft = 0; 4801 } 4802 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft, 4803 cfg->preferred_lft, !was_managetempaddr, 4804 jiffies); 4805 } 4806 4807 addrconf_verify_rtnl(); 4808 4809 return 0; 4810 } 4811 4812 static int 4813 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4814 struct netlink_ext_ack *extack) 4815 { 4816 struct net *net = sock_net(skb->sk); 4817 struct ifaddrmsg *ifm; 4818 struct nlattr *tb[IFA_MAX+1]; 4819 struct in6_addr *peer_pfx; 4820 struct inet6_ifaddr *ifa; 4821 struct net_device *dev; 4822 struct inet6_dev *idev; 4823 struct ifa6_config cfg; 4824 int err; 4825 4826 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4827 ifa_ipv6_policy, extack); 4828 if (err < 0) 4829 return err; 4830 4831 memset(&cfg, 0, sizeof(cfg)); 4832 4833 ifm = nlmsg_data(nlh); 4834 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4835 if (!cfg.pfx) 4836 return -EINVAL; 4837 4838 cfg.peer_pfx = peer_pfx; 4839 cfg.plen = ifm->ifa_prefixlen; 4840 if (tb[IFA_RT_PRIORITY]) 4841 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]); 4842 4843 cfg.valid_lft = INFINITY_LIFE_TIME; 4844 cfg.preferred_lft = INFINITY_LIFE_TIME; 4845 4846 if (tb[IFA_CACHEINFO]) { 4847 struct ifa_cacheinfo *ci; 4848 4849 ci = nla_data(tb[IFA_CACHEINFO]); 4850 cfg.valid_lft = ci->ifa_valid; 4851 cfg.preferred_lft = ci->ifa_prefered; 4852 } 4853 4854 dev = __dev_get_by_index(net, ifm->ifa_index); 4855 if (!dev) 4856 return -ENODEV; 4857 4858 if (tb[IFA_FLAGS]) 4859 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]); 4860 else 4861 cfg.ifa_flags = ifm->ifa_flags; 4862 4863 /* We ignore other flags so far. */ 4864 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | 4865 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE | 4866 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC; 4867 4868 idev = ipv6_find_idev(dev); 4869 if (IS_ERR(idev)) 4870 return PTR_ERR(idev); 4871 4872 if (!ipv6_allow_optimistic_dad(net, idev)) 4873 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC; 4874 4875 if (cfg.ifa_flags & IFA_F_NODAD && 4876 cfg.ifa_flags & IFA_F_OPTIMISTIC) { 4877 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive"); 4878 return -EINVAL; 4879 } 4880 4881 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1); 4882 if (!ifa) { 4883 /* 4884 * It would be best to check for !NLM_F_CREATE here but 4885 * userspace already relies on not having to provide this. 4886 */ 4887 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack); 4888 } 4889 4890 if (nlh->nlmsg_flags & NLM_F_EXCL || 4891 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4892 err = -EEXIST; 4893 else 4894 err = inet6_addr_modify(ifa, &cfg); 4895 4896 in6_ifa_put(ifa); 4897 4898 return err; 4899 } 4900 4901 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4902 u8 scope, int ifindex) 4903 { 4904 struct ifaddrmsg *ifm; 4905 4906 ifm = nlmsg_data(nlh); 4907 ifm->ifa_family = AF_INET6; 4908 ifm->ifa_prefixlen = prefixlen; 4909 ifm->ifa_flags = flags; 4910 ifm->ifa_scope = scope; 4911 ifm->ifa_index = ifindex; 4912 } 4913 4914 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4915 unsigned long tstamp, u32 preferred, u32 valid) 4916 { 4917 struct ifa_cacheinfo ci; 4918 4919 ci.cstamp = cstamp_delta(cstamp); 4920 ci.tstamp = cstamp_delta(tstamp); 4921 ci.ifa_prefered = preferred; 4922 ci.ifa_valid = valid; 4923 4924 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4925 } 4926 4927 static inline int rt_scope(int ifa_scope) 4928 { 4929 if (ifa_scope & IFA_HOST) 4930 return RT_SCOPE_HOST; 4931 else if (ifa_scope & IFA_LINK) 4932 return RT_SCOPE_LINK; 4933 else if (ifa_scope & IFA_SITE) 4934 return RT_SCOPE_SITE; 4935 else 4936 return RT_SCOPE_UNIVERSE; 4937 } 4938 4939 static inline int inet6_ifaddr_msgsize(void) 4940 { 4941 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4942 + nla_total_size(16) /* IFA_LOCAL */ 4943 + nla_total_size(16) /* IFA_ADDRESS */ 4944 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4945 + nla_total_size(4) /* IFA_FLAGS */ 4946 + nla_total_size(4) /* IFA_RT_PRIORITY */; 4947 } 4948 4949 enum addr_type_t { 4950 UNICAST_ADDR, 4951 MULTICAST_ADDR, 4952 ANYCAST_ADDR, 4953 }; 4954 4955 struct inet6_fill_args { 4956 u32 portid; 4957 u32 seq; 4958 int event; 4959 unsigned int flags; 4960 int netnsid; 4961 int ifindex; 4962 enum addr_type_t type; 4963 }; 4964 4965 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4966 struct inet6_fill_args *args) 4967 { 4968 struct nlmsghdr *nlh; 4969 u32 preferred, valid; 4970 4971 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 4972 sizeof(struct ifaddrmsg), args->flags); 4973 if (!nlh) 4974 return -EMSGSIZE; 4975 4976 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4977 ifa->idev->dev->ifindex); 4978 4979 if (args->netnsid >= 0 && 4980 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 4981 goto error; 4982 4983 if (!((ifa->flags&IFA_F_PERMANENT) && 4984 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4985 preferred = ifa->prefered_lft; 4986 valid = ifa->valid_lft; 4987 if (preferred != INFINITY_LIFE_TIME) { 4988 long tval = (jiffies - ifa->tstamp)/HZ; 4989 if (preferred > tval) 4990 preferred -= tval; 4991 else 4992 preferred = 0; 4993 if (valid != INFINITY_LIFE_TIME) { 4994 if (valid > tval) 4995 valid -= tval; 4996 else 4997 valid = 0; 4998 } 4999 } 5000 } else { 5001 preferred = INFINITY_LIFE_TIME; 5002 valid = INFINITY_LIFE_TIME; 5003 } 5004 5005 if (!ipv6_addr_any(&ifa->peer_addr)) { 5006 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 5007 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 5008 goto error; 5009 } else 5010 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 5011 goto error; 5012 5013 if (ifa->rt_priority && 5014 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority)) 5015 goto error; 5016 5017 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 5018 goto error; 5019 5020 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 5021 goto error; 5022 5023 nlmsg_end(skb, nlh); 5024 return 0; 5025 5026 error: 5027 nlmsg_cancel(skb, nlh); 5028 return -EMSGSIZE; 5029 } 5030 5031 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 5032 struct inet6_fill_args *args) 5033 { 5034 struct nlmsghdr *nlh; 5035 u8 scope = RT_SCOPE_UNIVERSE; 5036 int ifindex = ifmca->idev->dev->ifindex; 5037 5038 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 5039 scope = RT_SCOPE_SITE; 5040 5041 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5042 sizeof(struct ifaddrmsg), args->flags); 5043 if (!nlh) 5044 return -EMSGSIZE; 5045 5046 if (args->netnsid >= 0 && 5047 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5048 nlmsg_cancel(skb, nlh); 5049 return -EMSGSIZE; 5050 } 5051 5052 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5053 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 5054 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 5055 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5056 nlmsg_cancel(skb, nlh); 5057 return -EMSGSIZE; 5058 } 5059 5060 nlmsg_end(skb, nlh); 5061 return 0; 5062 } 5063 5064 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 5065 struct inet6_fill_args *args) 5066 { 5067 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt); 5068 int ifindex = dev ? dev->ifindex : 1; 5069 struct nlmsghdr *nlh; 5070 u8 scope = RT_SCOPE_UNIVERSE; 5071 5072 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 5073 scope = RT_SCOPE_SITE; 5074 5075 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5076 sizeof(struct ifaddrmsg), args->flags); 5077 if (!nlh) 5078 return -EMSGSIZE; 5079 5080 if (args->netnsid >= 0 && 5081 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5082 nlmsg_cancel(skb, nlh); 5083 return -EMSGSIZE; 5084 } 5085 5086 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5087 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 5088 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 5089 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5090 nlmsg_cancel(skb, nlh); 5091 return -EMSGSIZE; 5092 } 5093 5094 nlmsg_end(skb, nlh); 5095 return 0; 5096 } 5097 5098 /* called with rcu_read_lock() */ 5099 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 5100 struct netlink_callback *cb, int s_ip_idx, 5101 struct inet6_fill_args *fillargs) 5102 { 5103 struct ifmcaddr6 *ifmca; 5104 struct ifacaddr6 *ifaca; 5105 int ip_idx = 0; 5106 int err = 1; 5107 5108 read_lock_bh(&idev->lock); 5109 switch (fillargs->type) { 5110 case UNICAST_ADDR: { 5111 struct inet6_ifaddr *ifa; 5112 fillargs->event = RTM_NEWADDR; 5113 5114 /* unicast address incl. temp addr */ 5115 list_for_each_entry(ifa, &idev->addr_list, if_list) { 5116 if (ip_idx < s_ip_idx) 5117 goto next; 5118 err = inet6_fill_ifaddr(skb, ifa, fillargs); 5119 if (err < 0) 5120 break; 5121 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 5122 next: 5123 ip_idx++; 5124 } 5125 break; 5126 } 5127 case MULTICAST_ADDR: 5128 read_unlock_bh(&idev->lock); 5129 fillargs->event = RTM_GETMULTICAST; 5130 5131 /* multicast address */ 5132 for (ifmca = rcu_dereference(idev->mc_list); 5133 ifmca; 5134 ifmca = rcu_dereference(ifmca->next), ip_idx++) { 5135 if (ip_idx < s_ip_idx) 5136 continue; 5137 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs); 5138 if (err < 0) 5139 break; 5140 } 5141 read_lock_bh(&idev->lock); 5142 break; 5143 case ANYCAST_ADDR: 5144 fillargs->event = RTM_GETANYCAST; 5145 /* anycast address */ 5146 for (ifaca = idev->ac_list; ifaca; 5147 ifaca = ifaca->aca_next, ip_idx++) { 5148 if (ip_idx < s_ip_idx) 5149 continue; 5150 err = inet6_fill_ifacaddr(skb, ifaca, fillargs); 5151 if (err < 0) 5152 break; 5153 } 5154 break; 5155 default: 5156 break; 5157 } 5158 read_unlock_bh(&idev->lock); 5159 cb->args[2] = ip_idx; 5160 return err; 5161 } 5162 5163 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh, 5164 struct inet6_fill_args *fillargs, 5165 struct net **tgt_net, struct sock *sk, 5166 struct netlink_callback *cb) 5167 { 5168 struct netlink_ext_ack *extack = cb->extack; 5169 struct nlattr *tb[IFA_MAX+1]; 5170 struct ifaddrmsg *ifm; 5171 int err, i; 5172 5173 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5174 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request"); 5175 return -EINVAL; 5176 } 5177 5178 ifm = nlmsg_data(nlh); 5179 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5180 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request"); 5181 return -EINVAL; 5182 } 5183 5184 fillargs->ifindex = ifm->ifa_index; 5185 if (fillargs->ifindex) { 5186 cb->answer_flags |= NLM_F_DUMP_FILTERED; 5187 fillargs->flags |= NLM_F_DUMP_FILTERED; 5188 } 5189 5190 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5191 ifa_ipv6_policy, extack); 5192 if (err < 0) 5193 return err; 5194 5195 for (i = 0; i <= IFA_MAX; ++i) { 5196 if (!tb[i]) 5197 continue; 5198 5199 if (i == IFA_TARGET_NETNSID) { 5200 struct net *net; 5201 5202 fillargs->netnsid = nla_get_s32(tb[i]); 5203 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid); 5204 if (IS_ERR(net)) { 5205 fillargs->netnsid = -1; 5206 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id"); 5207 return PTR_ERR(net); 5208 } 5209 *tgt_net = net; 5210 } else { 5211 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); 5212 return -EINVAL; 5213 } 5214 } 5215 5216 return 0; 5217 } 5218 5219 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 5220 enum addr_type_t type) 5221 { 5222 const struct nlmsghdr *nlh = cb->nlh; 5223 struct inet6_fill_args fillargs = { 5224 .portid = NETLINK_CB(cb->skb).portid, 5225 .seq = cb->nlh->nlmsg_seq, 5226 .flags = NLM_F_MULTI, 5227 .netnsid = -1, 5228 .type = type, 5229 }; 5230 struct net *tgt_net = sock_net(skb->sk); 5231 int idx, s_idx, s_ip_idx; 5232 int h, s_h; 5233 struct net_device *dev; 5234 struct inet6_dev *idev; 5235 struct hlist_head *head; 5236 int err = 0; 5237 5238 s_h = cb->args[0]; 5239 s_idx = idx = cb->args[1]; 5240 s_ip_idx = cb->args[2]; 5241 5242 if (cb->strict_check) { 5243 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net, 5244 skb->sk, cb); 5245 if (err < 0) 5246 goto put_tgt_net; 5247 5248 err = 0; 5249 if (fillargs.ifindex) { 5250 dev = __dev_get_by_index(tgt_net, fillargs.ifindex); 5251 if (!dev) { 5252 err = -ENODEV; 5253 goto put_tgt_net; 5254 } 5255 idev = __in6_dev_get(dev); 5256 if (idev) { 5257 err = in6_dump_addrs(idev, skb, cb, s_ip_idx, 5258 &fillargs); 5259 if (err > 0) 5260 err = 0; 5261 } 5262 goto put_tgt_net; 5263 } 5264 } 5265 5266 rcu_read_lock(); 5267 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq; 5268 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5269 idx = 0; 5270 head = &tgt_net->dev_index_head[h]; 5271 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5272 if (idx < s_idx) 5273 goto cont; 5274 if (h > s_h || idx > s_idx) 5275 s_ip_idx = 0; 5276 idev = __in6_dev_get(dev); 5277 if (!idev) 5278 goto cont; 5279 5280 if (in6_dump_addrs(idev, skb, cb, s_ip_idx, 5281 &fillargs) < 0) 5282 goto done; 5283 cont: 5284 idx++; 5285 } 5286 } 5287 done: 5288 rcu_read_unlock(); 5289 cb->args[0] = h; 5290 cb->args[1] = idx; 5291 put_tgt_net: 5292 if (fillargs.netnsid >= 0) 5293 put_net(tgt_net); 5294 5295 return skb->len ? : err; 5296 } 5297 5298 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 5299 { 5300 enum addr_type_t type = UNICAST_ADDR; 5301 5302 return inet6_dump_addr(skb, cb, type); 5303 } 5304 5305 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 5306 { 5307 enum addr_type_t type = MULTICAST_ADDR; 5308 5309 return inet6_dump_addr(skb, cb, type); 5310 } 5311 5312 5313 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 5314 { 5315 enum addr_type_t type = ANYCAST_ADDR; 5316 5317 return inet6_dump_addr(skb, cb, type); 5318 } 5319 5320 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb, 5321 const struct nlmsghdr *nlh, 5322 struct nlattr **tb, 5323 struct netlink_ext_ack *extack) 5324 { 5325 struct ifaddrmsg *ifm; 5326 int i, err; 5327 5328 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5329 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request"); 5330 return -EINVAL; 5331 } 5332 5333 if (!netlink_strict_get_check(skb)) 5334 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 5335 ifa_ipv6_policy, extack); 5336 5337 ifm = nlmsg_data(nlh); 5338 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5339 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request"); 5340 return -EINVAL; 5341 } 5342 5343 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5344 ifa_ipv6_policy, extack); 5345 if (err) 5346 return err; 5347 5348 for (i = 0; i <= IFA_MAX; i++) { 5349 if (!tb[i]) 5350 continue; 5351 5352 switch (i) { 5353 case IFA_TARGET_NETNSID: 5354 case IFA_ADDRESS: 5355 case IFA_LOCAL: 5356 break; 5357 default: 5358 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request"); 5359 return -EINVAL; 5360 } 5361 } 5362 5363 return 0; 5364 } 5365 5366 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 5367 struct netlink_ext_ack *extack) 5368 { 5369 struct net *tgt_net = sock_net(in_skb->sk); 5370 struct inet6_fill_args fillargs = { 5371 .portid = NETLINK_CB(in_skb).portid, 5372 .seq = nlh->nlmsg_seq, 5373 .event = RTM_NEWADDR, 5374 .flags = 0, 5375 .netnsid = -1, 5376 }; 5377 struct ifaddrmsg *ifm; 5378 struct nlattr *tb[IFA_MAX+1]; 5379 struct in6_addr *addr = NULL, *peer; 5380 struct net_device *dev = NULL; 5381 struct inet6_ifaddr *ifa; 5382 struct sk_buff *skb; 5383 int err; 5384 5385 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack); 5386 if (err < 0) 5387 return err; 5388 5389 if (tb[IFA_TARGET_NETNSID]) { 5390 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]); 5391 5392 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk, 5393 fillargs.netnsid); 5394 if (IS_ERR(tgt_net)) 5395 return PTR_ERR(tgt_net); 5396 } 5397 5398 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 5399 if (!addr) 5400 return -EINVAL; 5401 5402 ifm = nlmsg_data(nlh); 5403 if (ifm->ifa_index) 5404 dev = dev_get_by_index(tgt_net, ifm->ifa_index); 5405 5406 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1); 5407 if (!ifa) { 5408 err = -EADDRNOTAVAIL; 5409 goto errout; 5410 } 5411 5412 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 5413 if (!skb) { 5414 err = -ENOBUFS; 5415 goto errout_ifa; 5416 } 5417 5418 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5419 if (err < 0) { 5420 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5421 WARN_ON(err == -EMSGSIZE); 5422 kfree_skb(skb); 5423 goto errout_ifa; 5424 } 5425 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid); 5426 errout_ifa: 5427 in6_ifa_put(ifa); 5428 errout: 5429 dev_put(dev); 5430 if (fillargs.netnsid >= 0) 5431 put_net(tgt_net); 5432 5433 return err; 5434 } 5435 5436 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 5437 { 5438 struct sk_buff *skb; 5439 struct net *net = dev_net(ifa->idev->dev); 5440 struct inet6_fill_args fillargs = { 5441 .portid = 0, 5442 .seq = 0, 5443 .event = event, 5444 .flags = 0, 5445 .netnsid = -1, 5446 }; 5447 int err = -ENOBUFS; 5448 5449 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 5450 if (!skb) 5451 goto errout; 5452 5453 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5454 if (err < 0) { 5455 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5456 WARN_ON(err == -EMSGSIZE); 5457 kfree_skb(skb); 5458 goto errout; 5459 } 5460 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 5461 return; 5462 errout: 5463 if (err < 0) 5464 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 5465 } 5466 5467 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 5468 __s32 *array, int bytes) 5469 { 5470 BUG_ON(bytes < (DEVCONF_MAX * 4)); 5471 5472 memset(array, 0, bytes); 5473 array[DEVCONF_FORWARDING] = cnf->forwarding; 5474 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 5475 array[DEVCONF_MTU6] = cnf->mtu6; 5476 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 5477 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 5478 array[DEVCONF_AUTOCONF] = cnf->autoconf; 5479 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 5480 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 5481 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5482 jiffies_to_msecs(cnf->rtr_solicit_interval); 5483 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5484 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 5485 array[DEVCONF_RTR_SOLICIT_DELAY] = 5486 jiffies_to_msecs(cnf->rtr_solicit_delay); 5487 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 5488 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5489 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 5490 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5491 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 5492 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 5493 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 5494 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 5495 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 5496 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 5497 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 5498 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 5499 array[DEVCONF_RA_DEFRTR_METRIC] = cnf->ra_defrtr_metric; 5500 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 5501 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 5502 #ifdef CONFIG_IPV6_ROUTER_PREF 5503 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 5504 array[DEVCONF_RTR_PROBE_INTERVAL] = 5505 jiffies_to_msecs(cnf->rtr_probe_interval); 5506 #ifdef CONFIG_IPV6_ROUTE_INFO 5507 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen; 5508 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 5509 #endif 5510 #endif 5511 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 5512 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 5513 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5514 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 5515 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 5516 #endif 5517 #ifdef CONFIG_IPV6_MROUTE 5518 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 5519 #endif 5520 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 5521 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 5522 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 5523 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 5524 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 5525 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 5526 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 5527 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 5528 /* we omit DEVCONF_STABLE_SECRET for now */ 5529 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 5530 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 5531 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 5532 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5533 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5534 #ifdef CONFIG_IPV6_SEG6_HMAC 5535 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5536 #endif 5537 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5538 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5539 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy; 5540 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass; 5541 array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled; 5542 array[DEVCONF_IOAM6_ENABLED] = cnf->ioam6_enabled; 5543 array[DEVCONF_IOAM6_ID] = cnf->ioam6_id; 5544 array[DEVCONF_IOAM6_ID_WIDE] = cnf->ioam6_id_wide; 5545 } 5546 5547 static inline size_t inet6_ifla6_size(void) 5548 { 5549 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5550 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5551 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5552 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5553 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5554 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */ 5555 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */ 5556 + nla_total_size(4) /* IFLA_INET6_RA_MTU */ 5557 + 0; 5558 } 5559 5560 static inline size_t inet6_if_nlmsg_size(void) 5561 { 5562 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5563 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5564 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5565 + nla_total_size(4) /* IFLA_MTU */ 5566 + nla_total_size(4) /* IFLA_LINK */ 5567 + nla_total_size(1) /* IFLA_OPERSTATE */ 5568 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5569 } 5570 5571 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5572 int bytes) 5573 { 5574 int i; 5575 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5576 BUG_ON(pad < 0); 5577 5578 /* Use put_unaligned() because stats may not be aligned for u64. */ 5579 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5580 for (i = 1; i < ICMP6_MIB_MAX; i++) 5581 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5582 5583 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5584 } 5585 5586 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5587 int bytes, size_t syncpoff) 5588 { 5589 int i, c; 5590 u64 buff[IPSTATS_MIB_MAX]; 5591 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5592 5593 BUG_ON(pad < 0); 5594 5595 memset(buff, 0, sizeof(buff)); 5596 buff[0] = IPSTATS_MIB_MAX; 5597 5598 for_each_possible_cpu(c) { 5599 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5600 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5601 } 5602 5603 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5604 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5605 } 5606 5607 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5608 int bytes) 5609 { 5610 switch (attrtype) { 5611 case IFLA_INET6_STATS: 5612 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5613 offsetof(struct ipstats_mib, syncp)); 5614 break; 5615 case IFLA_INET6_ICMP6STATS: 5616 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5617 break; 5618 } 5619 } 5620 5621 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5622 u32 ext_filter_mask) 5623 { 5624 struct nlattr *nla; 5625 struct ifla_cacheinfo ci; 5626 5627 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5628 goto nla_put_failure; 5629 ci.max_reasm_len = IPV6_MAXPLEN; 5630 ci.tstamp = cstamp_delta(idev->tstamp); 5631 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5632 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5633 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5634 goto nla_put_failure; 5635 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5636 if (!nla) 5637 goto nla_put_failure; 5638 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5639 5640 /* XXX - MC not implemented */ 5641 5642 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5643 return 0; 5644 5645 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5646 if (!nla) 5647 goto nla_put_failure; 5648 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5649 5650 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5651 if (!nla) 5652 goto nla_put_failure; 5653 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5654 5655 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5656 if (!nla) 5657 goto nla_put_failure; 5658 read_lock_bh(&idev->lock); 5659 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5660 read_unlock_bh(&idev->lock); 5661 5662 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5663 goto nla_put_failure; 5664 5665 if (idev->ra_mtu && 5666 nla_put_u32(skb, IFLA_INET6_RA_MTU, idev->ra_mtu)) 5667 goto nla_put_failure; 5668 5669 return 0; 5670 5671 nla_put_failure: 5672 return -EMSGSIZE; 5673 } 5674 5675 static size_t inet6_get_link_af_size(const struct net_device *dev, 5676 u32 ext_filter_mask) 5677 { 5678 if (!__in6_dev_get(dev)) 5679 return 0; 5680 5681 return inet6_ifla6_size(); 5682 } 5683 5684 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5685 u32 ext_filter_mask) 5686 { 5687 struct inet6_dev *idev = __in6_dev_get(dev); 5688 5689 if (!idev) 5690 return -ENODATA; 5691 5692 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5693 return -EMSGSIZE; 5694 5695 return 0; 5696 } 5697 5698 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token, 5699 struct netlink_ext_ack *extack) 5700 { 5701 struct inet6_ifaddr *ifp; 5702 struct net_device *dev = idev->dev; 5703 bool clear_token, update_rs = false; 5704 struct in6_addr ll_addr; 5705 5706 ASSERT_RTNL(); 5707 5708 if (!token) 5709 return -EINVAL; 5710 5711 if (dev->flags & IFF_LOOPBACK) { 5712 NL_SET_ERR_MSG_MOD(extack, "Device is loopback"); 5713 return -EINVAL; 5714 } 5715 5716 if (dev->flags & IFF_NOARP) { 5717 NL_SET_ERR_MSG_MOD(extack, 5718 "Device does not do neighbour discovery"); 5719 return -EINVAL; 5720 } 5721 5722 if (!ipv6_accept_ra(idev)) { 5723 NL_SET_ERR_MSG_MOD(extack, 5724 "Router advertisement is disabled on device"); 5725 return -EINVAL; 5726 } 5727 5728 if (idev->cnf.rtr_solicits == 0) { 5729 NL_SET_ERR_MSG(extack, 5730 "Router solicitation is disabled on device"); 5731 return -EINVAL; 5732 } 5733 5734 write_lock_bh(&idev->lock); 5735 5736 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5737 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5738 5739 write_unlock_bh(&idev->lock); 5740 5741 clear_token = ipv6_addr_any(token); 5742 if (clear_token) 5743 goto update_lft; 5744 5745 if (!idev->dead && (idev->if_flags & IF_READY) && 5746 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5747 IFA_F_OPTIMISTIC)) { 5748 /* If we're not ready, then normal ifup will take care 5749 * of this. Otherwise, we need to request our rs here. 5750 */ 5751 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5752 update_rs = true; 5753 } 5754 5755 update_lft: 5756 write_lock_bh(&idev->lock); 5757 5758 if (update_rs) { 5759 idev->if_flags |= IF_RS_SENT; 5760 idev->rs_interval = rfc3315_s14_backoff_init( 5761 idev->cnf.rtr_solicit_interval); 5762 idev->rs_probes = 1; 5763 addrconf_mod_rs_timer(idev, idev->rs_interval); 5764 } 5765 5766 /* Well, that's kinda nasty ... */ 5767 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5768 spin_lock(&ifp->lock); 5769 if (ifp->tokenized) { 5770 ifp->valid_lft = 0; 5771 ifp->prefered_lft = 0; 5772 } 5773 spin_unlock(&ifp->lock); 5774 } 5775 5776 write_unlock_bh(&idev->lock); 5777 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5778 addrconf_verify_rtnl(); 5779 return 0; 5780 } 5781 5782 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5783 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5784 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5785 [IFLA_INET6_RA_MTU] = { .type = NLA_REJECT, 5786 .reject_message = 5787 "IFLA_INET6_RA_MTU can not be set" }, 5788 }; 5789 5790 static int check_addr_gen_mode(int mode) 5791 { 5792 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5793 mode != IN6_ADDR_GEN_MODE_NONE && 5794 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5795 mode != IN6_ADDR_GEN_MODE_RANDOM) 5796 return -EINVAL; 5797 return 1; 5798 } 5799 5800 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5801 int mode) 5802 { 5803 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5804 !idev->cnf.stable_secret.initialized && 5805 !net->ipv6.devconf_dflt->stable_secret.initialized) 5806 return -EINVAL; 5807 return 1; 5808 } 5809 5810 static int inet6_validate_link_af(const struct net_device *dev, 5811 const struct nlattr *nla, 5812 struct netlink_ext_ack *extack) 5813 { 5814 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5815 struct inet6_dev *idev = NULL; 5816 int err; 5817 5818 if (dev) { 5819 idev = __in6_dev_get(dev); 5820 if (!idev) 5821 return -EAFNOSUPPORT; 5822 } 5823 5824 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, 5825 inet6_af_policy, extack); 5826 if (err) 5827 return err; 5828 5829 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE]) 5830 return -EINVAL; 5831 5832 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5833 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5834 5835 if (check_addr_gen_mode(mode) < 0) 5836 return -EINVAL; 5837 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0) 5838 return -EINVAL; 5839 } 5840 5841 return 0; 5842 } 5843 5844 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla, 5845 struct netlink_ext_ack *extack) 5846 { 5847 struct inet6_dev *idev = __in6_dev_get(dev); 5848 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5849 int err; 5850 5851 if (!idev) 5852 return -EAFNOSUPPORT; 5853 5854 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 5855 return -EINVAL; 5856 5857 if (tb[IFLA_INET6_TOKEN]) { 5858 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]), 5859 extack); 5860 if (err) 5861 return err; 5862 } 5863 5864 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5865 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5866 5867 idev->cnf.addr_gen_mode = mode; 5868 } 5869 5870 return 0; 5871 } 5872 5873 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5874 u32 portid, u32 seq, int event, unsigned int flags) 5875 { 5876 struct net_device *dev = idev->dev; 5877 struct ifinfomsg *hdr; 5878 struct nlmsghdr *nlh; 5879 void *protoinfo; 5880 5881 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5882 if (!nlh) 5883 return -EMSGSIZE; 5884 5885 hdr = nlmsg_data(nlh); 5886 hdr->ifi_family = AF_INET6; 5887 hdr->__ifi_pad = 0; 5888 hdr->ifi_type = dev->type; 5889 hdr->ifi_index = dev->ifindex; 5890 hdr->ifi_flags = dev_get_flags(dev); 5891 hdr->ifi_change = 0; 5892 5893 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5894 (dev->addr_len && 5895 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5896 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5897 (dev->ifindex != dev_get_iflink(dev) && 5898 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5899 nla_put_u8(skb, IFLA_OPERSTATE, 5900 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5901 goto nla_put_failure; 5902 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO); 5903 if (!protoinfo) 5904 goto nla_put_failure; 5905 5906 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5907 goto nla_put_failure; 5908 5909 nla_nest_end(skb, protoinfo); 5910 nlmsg_end(skb, nlh); 5911 return 0; 5912 5913 nla_put_failure: 5914 nlmsg_cancel(skb, nlh); 5915 return -EMSGSIZE; 5916 } 5917 5918 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh, 5919 struct netlink_ext_ack *extack) 5920 { 5921 struct ifinfomsg *ifm; 5922 5923 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5924 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request"); 5925 return -EINVAL; 5926 } 5927 5928 if (nlmsg_attrlen(nlh, sizeof(*ifm))) { 5929 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header"); 5930 return -EINVAL; 5931 } 5932 5933 ifm = nlmsg_data(nlh); 5934 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || 5935 ifm->ifi_change || ifm->ifi_index) { 5936 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request"); 5937 return -EINVAL; 5938 } 5939 5940 return 0; 5941 } 5942 5943 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5944 { 5945 struct net *net = sock_net(skb->sk); 5946 int h, s_h; 5947 int idx = 0, s_idx; 5948 struct net_device *dev; 5949 struct inet6_dev *idev; 5950 struct hlist_head *head; 5951 5952 /* only requests using strict checking can pass data to 5953 * influence the dump 5954 */ 5955 if (cb->strict_check) { 5956 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack); 5957 5958 if (err < 0) 5959 return err; 5960 } 5961 5962 s_h = cb->args[0]; 5963 s_idx = cb->args[1]; 5964 5965 rcu_read_lock(); 5966 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5967 idx = 0; 5968 head = &net->dev_index_head[h]; 5969 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5970 if (idx < s_idx) 5971 goto cont; 5972 idev = __in6_dev_get(dev); 5973 if (!idev) 5974 goto cont; 5975 if (inet6_fill_ifinfo(skb, idev, 5976 NETLINK_CB(cb->skb).portid, 5977 cb->nlh->nlmsg_seq, 5978 RTM_NEWLINK, NLM_F_MULTI) < 0) 5979 goto out; 5980 cont: 5981 idx++; 5982 } 5983 } 5984 out: 5985 rcu_read_unlock(); 5986 cb->args[1] = idx; 5987 cb->args[0] = h; 5988 5989 return skb->len; 5990 } 5991 5992 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5993 { 5994 struct sk_buff *skb; 5995 struct net *net = dev_net(idev->dev); 5996 int err = -ENOBUFS; 5997 5998 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5999 if (!skb) 6000 goto errout; 6001 6002 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 6003 if (err < 0) { 6004 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 6005 WARN_ON(err == -EMSGSIZE); 6006 kfree_skb(skb); 6007 goto errout; 6008 } 6009 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 6010 return; 6011 errout: 6012 if (err < 0) 6013 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 6014 } 6015 6016 static inline size_t inet6_prefix_nlmsg_size(void) 6017 { 6018 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 6019 + nla_total_size(sizeof(struct in6_addr)) 6020 + nla_total_size(sizeof(struct prefix_cacheinfo)); 6021 } 6022 6023 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 6024 struct prefix_info *pinfo, u32 portid, u32 seq, 6025 int event, unsigned int flags) 6026 { 6027 struct prefixmsg *pmsg; 6028 struct nlmsghdr *nlh; 6029 struct prefix_cacheinfo ci; 6030 6031 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 6032 if (!nlh) 6033 return -EMSGSIZE; 6034 6035 pmsg = nlmsg_data(nlh); 6036 pmsg->prefix_family = AF_INET6; 6037 pmsg->prefix_pad1 = 0; 6038 pmsg->prefix_pad2 = 0; 6039 pmsg->prefix_ifindex = idev->dev->ifindex; 6040 pmsg->prefix_len = pinfo->prefix_len; 6041 pmsg->prefix_type = pinfo->type; 6042 pmsg->prefix_pad3 = 0; 6043 pmsg->prefix_flags = 0; 6044 if (pinfo->onlink) 6045 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 6046 if (pinfo->autoconf) 6047 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 6048 6049 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 6050 goto nla_put_failure; 6051 ci.preferred_time = ntohl(pinfo->prefered); 6052 ci.valid_time = ntohl(pinfo->valid); 6053 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 6054 goto nla_put_failure; 6055 nlmsg_end(skb, nlh); 6056 return 0; 6057 6058 nla_put_failure: 6059 nlmsg_cancel(skb, nlh); 6060 return -EMSGSIZE; 6061 } 6062 6063 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 6064 struct prefix_info *pinfo) 6065 { 6066 struct sk_buff *skb; 6067 struct net *net = dev_net(idev->dev); 6068 int err = -ENOBUFS; 6069 6070 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 6071 if (!skb) 6072 goto errout; 6073 6074 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 6075 if (err < 0) { 6076 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 6077 WARN_ON(err == -EMSGSIZE); 6078 kfree_skb(skb); 6079 goto errout; 6080 } 6081 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 6082 return; 6083 errout: 6084 if (err < 0) 6085 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 6086 } 6087 6088 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6089 { 6090 struct net *net = dev_net(ifp->idev->dev); 6091 6092 if (event) 6093 ASSERT_RTNL(); 6094 6095 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 6096 6097 switch (event) { 6098 case RTM_NEWADDR: 6099 /* 6100 * If the address was optimistic we inserted the route at the 6101 * start of our DAD process, so we don't need to do it again. 6102 * If the device was taken down in the middle of the DAD 6103 * cycle there is a race where we could get here without a 6104 * host route, so nothing to insert. That will be fixed when 6105 * the device is brought up. 6106 */ 6107 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) { 6108 ip6_ins_rt(net, ifp->rt); 6109 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) { 6110 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n", 6111 &ifp->addr, ifp->idev->dev->name); 6112 } 6113 6114 if (ifp->idev->cnf.forwarding) 6115 addrconf_join_anycast(ifp); 6116 if (!ipv6_addr_any(&ifp->peer_addr)) 6117 addrconf_prefix_route(&ifp->peer_addr, 128, 6118 ifp->rt_priority, ifp->idev->dev, 6119 0, 0, GFP_ATOMIC); 6120 break; 6121 case RTM_DELADDR: 6122 if (ifp->idev->cnf.forwarding) 6123 addrconf_leave_anycast(ifp); 6124 addrconf_leave_solict(ifp->idev, &ifp->addr); 6125 if (!ipv6_addr_any(&ifp->peer_addr)) { 6126 struct fib6_info *rt; 6127 6128 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 6129 ifp->idev->dev, 0, 0, 6130 false); 6131 if (rt) 6132 ip6_del_rt(net, rt, false); 6133 } 6134 if (ifp->rt) { 6135 ip6_del_rt(net, ifp->rt, false); 6136 ifp->rt = NULL; 6137 } 6138 rt_genid_bump_ipv6(net); 6139 break; 6140 } 6141 atomic_inc(&net->ipv6.dev_addr_genid); 6142 } 6143 6144 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6145 { 6146 if (likely(ifp->idev->dead == 0)) 6147 __ipv6_ifa_notify(event, ifp); 6148 } 6149 6150 #ifdef CONFIG_SYSCTL 6151 6152 static int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 6153 void *buffer, size_t *lenp, loff_t *ppos) 6154 { 6155 int *valp = ctl->data; 6156 int val = *valp; 6157 loff_t pos = *ppos; 6158 struct ctl_table lctl; 6159 int ret; 6160 6161 /* 6162 * ctl->data points to idev->cnf.forwarding, we should 6163 * not modify it until we get the rtnl lock. 6164 */ 6165 lctl = *ctl; 6166 lctl.data = &val; 6167 6168 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6169 6170 if (write) 6171 ret = addrconf_fixup_forwarding(ctl, valp, val); 6172 if (ret) 6173 *ppos = pos; 6174 return ret; 6175 } 6176 6177 static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 6178 void *buffer, size_t *lenp, loff_t *ppos) 6179 { 6180 struct inet6_dev *idev = ctl->extra1; 6181 int min_mtu = IPV6_MIN_MTU; 6182 struct ctl_table lctl; 6183 6184 lctl = *ctl; 6185 lctl.extra1 = &min_mtu; 6186 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 6187 6188 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 6189 } 6190 6191 static void dev_disable_change(struct inet6_dev *idev) 6192 { 6193 struct netdev_notifier_info info; 6194 6195 if (!idev || !idev->dev) 6196 return; 6197 6198 netdev_notifier_info_init(&info, idev->dev); 6199 if (idev->cnf.disable_ipv6) 6200 addrconf_notify(NULL, NETDEV_DOWN, &info); 6201 else 6202 addrconf_notify(NULL, NETDEV_UP, &info); 6203 } 6204 6205 static void addrconf_disable_change(struct net *net, __s32 newf) 6206 { 6207 struct net_device *dev; 6208 struct inet6_dev *idev; 6209 6210 for_each_netdev(net, dev) { 6211 idev = __in6_dev_get(dev); 6212 if (idev) { 6213 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 6214 idev->cnf.disable_ipv6 = newf; 6215 if (changed) 6216 dev_disable_change(idev); 6217 } 6218 } 6219 } 6220 6221 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 6222 { 6223 struct net *net; 6224 int old; 6225 6226 if (!rtnl_trylock()) 6227 return restart_syscall(); 6228 6229 net = (struct net *)table->extra2; 6230 old = *p; 6231 *p = newf; 6232 6233 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 6234 rtnl_unlock(); 6235 return 0; 6236 } 6237 6238 if (p == &net->ipv6.devconf_all->disable_ipv6) { 6239 net->ipv6.devconf_dflt->disable_ipv6 = newf; 6240 addrconf_disable_change(net, newf); 6241 } else if ((!newf) ^ (!old)) 6242 dev_disable_change((struct inet6_dev *)table->extra1); 6243 6244 rtnl_unlock(); 6245 return 0; 6246 } 6247 6248 static int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 6249 void *buffer, size_t *lenp, loff_t *ppos) 6250 { 6251 int *valp = ctl->data; 6252 int val = *valp; 6253 loff_t pos = *ppos; 6254 struct ctl_table lctl; 6255 int ret; 6256 6257 /* 6258 * ctl->data points to idev->cnf.disable_ipv6, we should 6259 * not modify it until we get the rtnl lock. 6260 */ 6261 lctl = *ctl; 6262 lctl.data = &val; 6263 6264 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6265 6266 if (write) 6267 ret = addrconf_disable_ipv6(ctl, valp, val); 6268 if (ret) 6269 *ppos = pos; 6270 return ret; 6271 } 6272 6273 static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 6274 void *buffer, size_t *lenp, loff_t *ppos) 6275 { 6276 int *valp = ctl->data; 6277 int ret; 6278 int old, new; 6279 6280 old = *valp; 6281 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 6282 new = *valp; 6283 6284 if (write && old != new) { 6285 struct net *net = ctl->extra2; 6286 6287 if (!rtnl_trylock()) 6288 return restart_syscall(); 6289 6290 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 6291 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6292 NETCONFA_PROXY_NEIGH, 6293 NETCONFA_IFINDEX_DEFAULT, 6294 net->ipv6.devconf_dflt); 6295 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 6296 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6297 NETCONFA_PROXY_NEIGH, 6298 NETCONFA_IFINDEX_ALL, 6299 net->ipv6.devconf_all); 6300 else { 6301 struct inet6_dev *idev = ctl->extra1; 6302 6303 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6304 NETCONFA_PROXY_NEIGH, 6305 idev->dev->ifindex, 6306 &idev->cnf); 6307 } 6308 rtnl_unlock(); 6309 } 6310 6311 return ret; 6312 } 6313 6314 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 6315 void *buffer, size_t *lenp, 6316 loff_t *ppos) 6317 { 6318 int ret = 0; 6319 u32 new_val; 6320 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 6321 struct net *net = (struct net *)ctl->extra2; 6322 struct ctl_table tmp = { 6323 .data = &new_val, 6324 .maxlen = sizeof(new_val), 6325 .mode = ctl->mode, 6326 }; 6327 6328 if (!rtnl_trylock()) 6329 return restart_syscall(); 6330 6331 new_val = *((u32 *)ctl->data); 6332 6333 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos); 6334 if (ret != 0) 6335 goto out; 6336 6337 if (write) { 6338 if (check_addr_gen_mode(new_val) < 0) { 6339 ret = -EINVAL; 6340 goto out; 6341 } 6342 6343 if (idev) { 6344 if (check_stable_privacy(idev, net, new_val) < 0) { 6345 ret = -EINVAL; 6346 goto out; 6347 } 6348 6349 if (idev->cnf.addr_gen_mode != new_val) { 6350 idev->cnf.addr_gen_mode = new_val; 6351 addrconf_dev_config(idev->dev); 6352 } 6353 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) { 6354 struct net_device *dev; 6355 6356 net->ipv6.devconf_dflt->addr_gen_mode = new_val; 6357 for_each_netdev(net, dev) { 6358 idev = __in6_dev_get(dev); 6359 if (idev && 6360 idev->cnf.addr_gen_mode != new_val) { 6361 idev->cnf.addr_gen_mode = new_val; 6362 addrconf_dev_config(idev->dev); 6363 } 6364 } 6365 } 6366 6367 *((u32 *)ctl->data) = new_val; 6368 } 6369 6370 out: 6371 rtnl_unlock(); 6372 6373 return ret; 6374 } 6375 6376 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 6377 void *buffer, size_t *lenp, 6378 loff_t *ppos) 6379 { 6380 int err; 6381 struct in6_addr addr; 6382 char str[IPV6_MAX_STRLEN]; 6383 struct ctl_table lctl = *ctl; 6384 struct net *net = ctl->extra2; 6385 struct ipv6_stable_secret *secret = ctl->data; 6386 6387 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 6388 return -EIO; 6389 6390 lctl.maxlen = IPV6_MAX_STRLEN; 6391 lctl.data = str; 6392 6393 if (!rtnl_trylock()) 6394 return restart_syscall(); 6395 6396 if (!write && !secret->initialized) { 6397 err = -EIO; 6398 goto out; 6399 } 6400 6401 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 6402 if (err >= sizeof(str)) { 6403 err = -EIO; 6404 goto out; 6405 } 6406 6407 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 6408 if (err || !write) 6409 goto out; 6410 6411 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 6412 err = -EIO; 6413 goto out; 6414 } 6415 6416 secret->initialized = true; 6417 secret->secret = addr; 6418 6419 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 6420 struct net_device *dev; 6421 6422 for_each_netdev(net, dev) { 6423 struct inet6_dev *idev = __in6_dev_get(dev); 6424 6425 if (idev) { 6426 idev->cnf.addr_gen_mode = 6427 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6428 } 6429 } 6430 } else { 6431 struct inet6_dev *idev = ctl->extra1; 6432 6433 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6434 } 6435 6436 out: 6437 rtnl_unlock(); 6438 6439 return err; 6440 } 6441 6442 static 6443 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 6444 int write, void *buffer, 6445 size_t *lenp, 6446 loff_t *ppos) 6447 { 6448 int *valp = ctl->data; 6449 int val = *valp; 6450 loff_t pos = *ppos; 6451 struct ctl_table lctl; 6452 int ret; 6453 6454 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 6455 * we should not modify it until we get the rtnl lock. 6456 */ 6457 lctl = *ctl; 6458 lctl.data = &val; 6459 6460 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6461 6462 if (write) 6463 ret = addrconf_fixup_linkdown(ctl, valp, val); 6464 if (ret) 6465 *ppos = pos; 6466 return ret; 6467 } 6468 6469 static 6470 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 6471 { 6472 if (rt) { 6473 if (action) 6474 rt->dst.flags |= DST_NOPOLICY; 6475 else 6476 rt->dst.flags &= ~DST_NOPOLICY; 6477 } 6478 } 6479 6480 static 6481 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 6482 { 6483 struct inet6_ifaddr *ifa; 6484 6485 read_lock_bh(&idev->lock); 6486 list_for_each_entry(ifa, &idev->addr_list, if_list) { 6487 spin_lock(&ifa->lock); 6488 if (ifa->rt) { 6489 /* host routes only use builtin fib6_nh */ 6490 struct fib6_nh *nh = ifa->rt->fib6_nh; 6491 int cpu; 6492 6493 rcu_read_lock(); 6494 ifa->rt->dst_nopolicy = val ? true : false; 6495 if (nh->rt6i_pcpu) { 6496 for_each_possible_cpu(cpu) { 6497 struct rt6_info **rtp; 6498 6499 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu); 6500 addrconf_set_nopolicy(*rtp, val); 6501 } 6502 } 6503 rcu_read_unlock(); 6504 } 6505 spin_unlock(&ifa->lock); 6506 } 6507 read_unlock_bh(&idev->lock); 6508 } 6509 6510 static 6511 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 6512 { 6513 struct inet6_dev *idev; 6514 struct net *net; 6515 6516 if (!rtnl_trylock()) 6517 return restart_syscall(); 6518 6519 *valp = val; 6520 6521 net = (struct net *)ctl->extra2; 6522 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 6523 rtnl_unlock(); 6524 return 0; 6525 } 6526 6527 if (valp == &net->ipv6.devconf_all->disable_policy) { 6528 struct net_device *dev; 6529 6530 for_each_netdev(net, dev) { 6531 idev = __in6_dev_get(dev); 6532 if (idev) 6533 addrconf_disable_policy_idev(idev, val); 6534 } 6535 } else { 6536 idev = (struct inet6_dev *)ctl->extra1; 6537 addrconf_disable_policy_idev(idev, val); 6538 } 6539 6540 rtnl_unlock(); 6541 return 0; 6542 } 6543 6544 static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 6545 void *buffer, size_t *lenp, loff_t *ppos) 6546 { 6547 int *valp = ctl->data; 6548 int val = *valp; 6549 loff_t pos = *ppos; 6550 struct ctl_table lctl; 6551 int ret; 6552 6553 lctl = *ctl; 6554 lctl.data = &val; 6555 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6556 6557 if (write && (*valp != val)) 6558 ret = addrconf_disable_policy(ctl, valp, val); 6559 6560 if (ret) 6561 *ppos = pos; 6562 6563 return ret; 6564 } 6565 6566 static int minus_one = -1; 6567 static const int two_five_five = 255; 6568 static u32 ioam6_if_id_max = U16_MAX; 6569 6570 static const struct ctl_table addrconf_sysctl[] = { 6571 { 6572 .procname = "forwarding", 6573 .data = &ipv6_devconf.forwarding, 6574 .maxlen = sizeof(int), 6575 .mode = 0644, 6576 .proc_handler = addrconf_sysctl_forward, 6577 }, 6578 { 6579 .procname = "hop_limit", 6580 .data = &ipv6_devconf.hop_limit, 6581 .maxlen = sizeof(int), 6582 .mode = 0644, 6583 .proc_handler = proc_dointvec_minmax, 6584 .extra1 = (void *)SYSCTL_ONE, 6585 .extra2 = (void *)&two_five_five, 6586 }, 6587 { 6588 .procname = "mtu", 6589 .data = &ipv6_devconf.mtu6, 6590 .maxlen = sizeof(int), 6591 .mode = 0644, 6592 .proc_handler = addrconf_sysctl_mtu, 6593 }, 6594 { 6595 .procname = "accept_ra", 6596 .data = &ipv6_devconf.accept_ra, 6597 .maxlen = sizeof(int), 6598 .mode = 0644, 6599 .proc_handler = proc_dointvec, 6600 }, 6601 { 6602 .procname = "accept_redirects", 6603 .data = &ipv6_devconf.accept_redirects, 6604 .maxlen = sizeof(int), 6605 .mode = 0644, 6606 .proc_handler = proc_dointvec, 6607 }, 6608 { 6609 .procname = "autoconf", 6610 .data = &ipv6_devconf.autoconf, 6611 .maxlen = sizeof(int), 6612 .mode = 0644, 6613 .proc_handler = proc_dointvec, 6614 }, 6615 { 6616 .procname = "dad_transmits", 6617 .data = &ipv6_devconf.dad_transmits, 6618 .maxlen = sizeof(int), 6619 .mode = 0644, 6620 .proc_handler = proc_dointvec, 6621 }, 6622 { 6623 .procname = "router_solicitations", 6624 .data = &ipv6_devconf.rtr_solicits, 6625 .maxlen = sizeof(int), 6626 .mode = 0644, 6627 .proc_handler = proc_dointvec_minmax, 6628 .extra1 = &minus_one, 6629 }, 6630 { 6631 .procname = "router_solicitation_interval", 6632 .data = &ipv6_devconf.rtr_solicit_interval, 6633 .maxlen = sizeof(int), 6634 .mode = 0644, 6635 .proc_handler = proc_dointvec_jiffies, 6636 }, 6637 { 6638 .procname = "router_solicitation_max_interval", 6639 .data = &ipv6_devconf.rtr_solicit_max_interval, 6640 .maxlen = sizeof(int), 6641 .mode = 0644, 6642 .proc_handler = proc_dointvec_jiffies, 6643 }, 6644 { 6645 .procname = "router_solicitation_delay", 6646 .data = &ipv6_devconf.rtr_solicit_delay, 6647 .maxlen = sizeof(int), 6648 .mode = 0644, 6649 .proc_handler = proc_dointvec_jiffies, 6650 }, 6651 { 6652 .procname = "force_mld_version", 6653 .data = &ipv6_devconf.force_mld_version, 6654 .maxlen = sizeof(int), 6655 .mode = 0644, 6656 .proc_handler = proc_dointvec, 6657 }, 6658 { 6659 .procname = "mldv1_unsolicited_report_interval", 6660 .data = 6661 &ipv6_devconf.mldv1_unsolicited_report_interval, 6662 .maxlen = sizeof(int), 6663 .mode = 0644, 6664 .proc_handler = proc_dointvec_ms_jiffies, 6665 }, 6666 { 6667 .procname = "mldv2_unsolicited_report_interval", 6668 .data = 6669 &ipv6_devconf.mldv2_unsolicited_report_interval, 6670 .maxlen = sizeof(int), 6671 .mode = 0644, 6672 .proc_handler = proc_dointvec_ms_jiffies, 6673 }, 6674 { 6675 .procname = "use_tempaddr", 6676 .data = &ipv6_devconf.use_tempaddr, 6677 .maxlen = sizeof(int), 6678 .mode = 0644, 6679 .proc_handler = proc_dointvec, 6680 }, 6681 { 6682 .procname = "temp_valid_lft", 6683 .data = &ipv6_devconf.temp_valid_lft, 6684 .maxlen = sizeof(int), 6685 .mode = 0644, 6686 .proc_handler = proc_dointvec, 6687 }, 6688 { 6689 .procname = "temp_prefered_lft", 6690 .data = &ipv6_devconf.temp_prefered_lft, 6691 .maxlen = sizeof(int), 6692 .mode = 0644, 6693 .proc_handler = proc_dointvec, 6694 }, 6695 { 6696 .procname = "regen_max_retry", 6697 .data = &ipv6_devconf.regen_max_retry, 6698 .maxlen = sizeof(int), 6699 .mode = 0644, 6700 .proc_handler = proc_dointvec, 6701 }, 6702 { 6703 .procname = "max_desync_factor", 6704 .data = &ipv6_devconf.max_desync_factor, 6705 .maxlen = sizeof(int), 6706 .mode = 0644, 6707 .proc_handler = proc_dointvec, 6708 }, 6709 { 6710 .procname = "max_addresses", 6711 .data = &ipv6_devconf.max_addresses, 6712 .maxlen = sizeof(int), 6713 .mode = 0644, 6714 .proc_handler = proc_dointvec, 6715 }, 6716 { 6717 .procname = "accept_ra_defrtr", 6718 .data = &ipv6_devconf.accept_ra_defrtr, 6719 .maxlen = sizeof(int), 6720 .mode = 0644, 6721 .proc_handler = proc_dointvec, 6722 }, 6723 { 6724 .procname = "ra_defrtr_metric", 6725 .data = &ipv6_devconf.ra_defrtr_metric, 6726 .maxlen = sizeof(u32), 6727 .mode = 0644, 6728 .proc_handler = proc_douintvec_minmax, 6729 .extra1 = (void *)SYSCTL_ONE, 6730 }, 6731 { 6732 .procname = "accept_ra_min_hop_limit", 6733 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6734 .maxlen = sizeof(int), 6735 .mode = 0644, 6736 .proc_handler = proc_dointvec, 6737 }, 6738 { 6739 .procname = "accept_ra_pinfo", 6740 .data = &ipv6_devconf.accept_ra_pinfo, 6741 .maxlen = sizeof(int), 6742 .mode = 0644, 6743 .proc_handler = proc_dointvec, 6744 }, 6745 #ifdef CONFIG_IPV6_ROUTER_PREF 6746 { 6747 .procname = "accept_ra_rtr_pref", 6748 .data = &ipv6_devconf.accept_ra_rtr_pref, 6749 .maxlen = sizeof(int), 6750 .mode = 0644, 6751 .proc_handler = proc_dointvec, 6752 }, 6753 { 6754 .procname = "router_probe_interval", 6755 .data = &ipv6_devconf.rtr_probe_interval, 6756 .maxlen = sizeof(int), 6757 .mode = 0644, 6758 .proc_handler = proc_dointvec_jiffies, 6759 }, 6760 #ifdef CONFIG_IPV6_ROUTE_INFO 6761 { 6762 .procname = "accept_ra_rt_info_min_plen", 6763 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6764 .maxlen = sizeof(int), 6765 .mode = 0644, 6766 .proc_handler = proc_dointvec, 6767 }, 6768 { 6769 .procname = "accept_ra_rt_info_max_plen", 6770 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6771 .maxlen = sizeof(int), 6772 .mode = 0644, 6773 .proc_handler = proc_dointvec, 6774 }, 6775 #endif 6776 #endif 6777 { 6778 .procname = "proxy_ndp", 6779 .data = &ipv6_devconf.proxy_ndp, 6780 .maxlen = sizeof(int), 6781 .mode = 0644, 6782 .proc_handler = addrconf_sysctl_proxy_ndp, 6783 }, 6784 { 6785 .procname = "accept_source_route", 6786 .data = &ipv6_devconf.accept_source_route, 6787 .maxlen = sizeof(int), 6788 .mode = 0644, 6789 .proc_handler = proc_dointvec, 6790 }, 6791 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6792 { 6793 .procname = "optimistic_dad", 6794 .data = &ipv6_devconf.optimistic_dad, 6795 .maxlen = sizeof(int), 6796 .mode = 0644, 6797 .proc_handler = proc_dointvec, 6798 }, 6799 { 6800 .procname = "use_optimistic", 6801 .data = &ipv6_devconf.use_optimistic, 6802 .maxlen = sizeof(int), 6803 .mode = 0644, 6804 .proc_handler = proc_dointvec, 6805 }, 6806 #endif 6807 #ifdef CONFIG_IPV6_MROUTE 6808 { 6809 .procname = "mc_forwarding", 6810 .data = &ipv6_devconf.mc_forwarding, 6811 .maxlen = sizeof(int), 6812 .mode = 0444, 6813 .proc_handler = proc_dointvec, 6814 }, 6815 #endif 6816 { 6817 .procname = "disable_ipv6", 6818 .data = &ipv6_devconf.disable_ipv6, 6819 .maxlen = sizeof(int), 6820 .mode = 0644, 6821 .proc_handler = addrconf_sysctl_disable, 6822 }, 6823 { 6824 .procname = "accept_dad", 6825 .data = &ipv6_devconf.accept_dad, 6826 .maxlen = sizeof(int), 6827 .mode = 0644, 6828 .proc_handler = proc_dointvec, 6829 }, 6830 { 6831 .procname = "force_tllao", 6832 .data = &ipv6_devconf.force_tllao, 6833 .maxlen = sizeof(int), 6834 .mode = 0644, 6835 .proc_handler = proc_dointvec 6836 }, 6837 { 6838 .procname = "ndisc_notify", 6839 .data = &ipv6_devconf.ndisc_notify, 6840 .maxlen = sizeof(int), 6841 .mode = 0644, 6842 .proc_handler = proc_dointvec 6843 }, 6844 { 6845 .procname = "suppress_frag_ndisc", 6846 .data = &ipv6_devconf.suppress_frag_ndisc, 6847 .maxlen = sizeof(int), 6848 .mode = 0644, 6849 .proc_handler = proc_dointvec 6850 }, 6851 { 6852 .procname = "accept_ra_from_local", 6853 .data = &ipv6_devconf.accept_ra_from_local, 6854 .maxlen = sizeof(int), 6855 .mode = 0644, 6856 .proc_handler = proc_dointvec, 6857 }, 6858 { 6859 .procname = "accept_ra_mtu", 6860 .data = &ipv6_devconf.accept_ra_mtu, 6861 .maxlen = sizeof(int), 6862 .mode = 0644, 6863 .proc_handler = proc_dointvec, 6864 }, 6865 { 6866 .procname = "stable_secret", 6867 .data = &ipv6_devconf.stable_secret, 6868 .maxlen = IPV6_MAX_STRLEN, 6869 .mode = 0600, 6870 .proc_handler = addrconf_sysctl_stable_secret, 6871 }, 6872 { 6873 .procname = "use_oif_addrs_only", 6874 .data = &ipv6_devconf.use_oif_addrs_only, 6875 .maxlen = sizeof(int), 6876 .mode = 0644, 6877 .proc_handler = proc_dointvec, 6878 }, 6879 { 6880 .procname = "ignore_routes_with_linkdown", 6881 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6882 .maxlen = sizeof(int), 6883 .mode = 0644, 6884 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6885 }, 6886 { 6887 .procname = "drop_unicast_in_l2_multicast", 6888 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6889 .maxlen = sizeof(int), 6890 .mode = 0644, 6891 .proc_handler = proc_dointvec, 6892 }, 6893 { 6894 .procname = "drop_unsolicited_na", 6895 .data = &ipv6_devconf.drop_unsolicited_na, 6896 .maxlen = sizeof(int), 6897 .mode = 0644, 6898 .proc_handler = proc_dointvec, 6899 }, 6900 { 6901 .procname = "keep_addr_on_down", 6902 .data = &ipv6_devconf.keep_addr_on_down, 6903 .maxlen = sizeof(int), 6904 .mode = 0644, 6905 .proc_handler = proc_dointvec, 6906 6907 }, 6908 { 6909 .procname = "seg6_enabled", 6910 .data = &ipv6_devconf.seg6_enabled, 6911 .maxlen = sizeof(int), 6912 .mode = 0644, 6913 .proc_handler = proc_dointvec, 6914 }, 6915 #ifdef CONFIG_IPV6_SEG6_HMAC 6916 { 6917 .procname = "seg6_require_hmac", 6918 .data = &ipv6_devconf.seg6_require_hmac, 6919 .maxlen = sizeof(int), 6920 .mode = 0644, 6921 .proc_handler = proc_dointvec, 6922 }, 6923 #endif 6924 { 6925 .procname = "enhanced_dad", 6926 .data = &ipv6_devconf.enhanced_dad, 6927 .maxlen = sizeof(int), 6928 .mode = 0644, 6929 .proc_handler = proc_dointvec, 6930 }, 6931 { 6932 .procname = "addr_gen_mode", 6933 .data = &ipv6_devconf.addr_gen_mode, 6934 .maxlen = sizeof(int), 6935 .mode = 0644, 6936 .proc_handler = addrconf_sysctl_addr_gen_mode, 6937 }, 6938 { 6939 .procname = "disable_policy", 6940 .data = &ipv6_devconf.disable_policy, 6941 .maxlen = sizeof(int), 6942 .mode = 0644, 6943 .proc_handler = addrconf_sysctl_disable_policy, 6944 }, 6945 { 6946 .procname = "ndisc_tclass", 6947 .data = &ipv6_devconf.ndisc_tclass, 6948 .maxlen = sizeof(int), 6949 .mode = 0644, 6950 .proc_handler = proc_dointvec_minmax, 6951 .extra1 = (void *)SYSCTL_ZERO, 6952 .extra2 = (void *)&two_five_five, 6953 }, 6954 { 6955 .procname = "rpl_seg_enabled", 6956 .data = &ipv6_devconf.rpl_seg_enabled, 6957 .maxlen = sizeof(int), 6958 .mode = 0644, 6959 .proc_handler = proc_dointvec, 6960 }, 6961 { 6962 .procname = "ioam6_enabled", 6963 .data = &ipv6_devconf.ioam6_enabled, 6964 .maxlen = sizeof(u8), 6965 .mode = 0644, 6966 .proc_handler = proc_dou8vec_minmax, 6967 .extra1 = (void *)SYSCTL_ZERO, 6968 .extra2 = (void *)SYSCTL_ONE, 6969 }, 6970 { 6971 .procname = "ioam6_id", 6972 .data = &ipv6_devconf.ioam6_id, 6973 .maxlen = sizeof(u32), 6974 .mode = 0644, 6975 .proc_handler = proc_douintvec_minmax, 6976 .extra1 = (void *)SYSCTL_ZERO, 6977 .extra2 = (void *)&ioam6_if_id_max, 6978 }, 6979 { 6980 .procname = "ioam6_id_wide", 6981 .data = &ipv6_devconf.ioam6_id_wide, 6982 .maxlen = sizeof(u32), 6983 .mode = 0644, 6984 .proc_handler = proc_douintvec, 6985 }, 6986 { 6987 /* sentinel */ 6988 } 6989 }; 6990 6991 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 6992 struct inet6_dev *idev, struct ipv6_devconf *p) 6993 { 6994 int i, ifindex; 6995 struct ctl_table *table; 6996 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 6997 6998 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 6999 if (!table) 7000 goto out; 7001 7002 for (i = 0; table[i].data; i++) { 7003 table[i].data += (char *)p - (char *)&ipv6_devconf; 7004 /* If one of these is already set, then it is not safe to 7005 * overwrite either of them: this makes proc_dointvec_minmax 7006 * usable. 7007 */ 7008 if (!table[i].extra1 && !table[i].extra2) { 7009 table[i].extra1 = idev; /* embedded; no ref */ 7010 table[i].extra2 = net; 7011 } 7012 } 7013 7014 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 7015 7016 p->sysctl_header = register_net_sysctl(net, path, table); 7017 if (!p->sysctl_header) 7018 goto free; 7019 7020 if (!strcmp(dev_name, "all")) 7021 ifindex = NETCONFA_IFINDEX_ALL; 7022 else if (!strcmp(dev_name, "default")) 7023 ifindex = NETCONFA_IFINDEX_DEFAULT; 7024 else 7025 ifindex = idev->dev->ifindex; 7026 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 7027 ifindex, p); 7028 return 0; 7029 7030 free: 7031 kfree(table); 7032 out: 7033 return -ENOBUFS; 7034 } 7035 7036 static void __addrconf_sysctl_unregister(struct net *net, 7037 struct ipv6_devconf *p, int ifindex) 7038 { 7039 struct ctl_table *table; 7040 7041 if (!p->sysctl_header) 7042 return; 7043 7044 table = p->sysctl_header->ctl_table_arg; 7045 unregister_net_sysctl_table(p->sysctl_header); 7046 p->sysctl_header = NULL; 7047 kfree(table); 7048 7049 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 7050 } 7051 7052 static int addrconf_sysctl_register(struct inet6_dev *idev) 7053 { 7054 int err; 7055 7056 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 7057 return -EINVAL; 7058 7059 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 7060 &ndisc_ifinfo_sysctl_change); 7061 if (err) 7062 return err; 7063 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 7064 idev, &idev->cnf); 7065 if (err) 7066 neigh_sysctl_unregister(idev->nd_parms); 7067 7068 return err; 7069 } 7070 7071 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 7072 { 7073 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 7074 idev->dev->ifindex); 7075 neigh_sysctl_unregister(idev->nd_parms); 7076 } 7077 7078 7079 #endif 7080 7081 static int __net_init addrconf_init_net(struct net *net) 7082 { 7083 int err = -ENOMEM; 7084 struct ipv6_devconf *all, *dflt; 7085 7086 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 7087 if (!all) 7088 goto err_alloc_all; 7089 7090 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 7091 if (!dflt) 7092 goto err_alloc_dflt; 7093 7094 if (IS_ENABLED(CONFIG_SYSCTL) && 7095 !net_eq(net, &init_net)) { 7096 switch (sysctl_devconf_inherit_init_net) { 7097 case 1: /* copy from init_net */ 7098 memcpy(all, init_net.ipv6.devconf_all, 7099 sizeof(ipv6_devconf)); 7100 memcpy(dflt, init_net.ipv6.devconf_dflt, 7101 sizeof(ipv6_devconf_dflt)); 7102 break; 7103 case 3: /* copy from the current netns */ 7104 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all, 7105 sizeof(ipv6_devconf)); 7106 memcpy(dflt, 7107 current->nsproxy->net_ns->ipv6.devconf_dflt, 7108 sizeof(ipv6_devconf_dflt)); 7109 break; 7110 case 0: 7111 case 2: 7112 /* use compiled values */ 7113 break; 7114 } 7115 } 7116 7117 /* these will be inherited by all namespaces */ 7118 dflt->autoconf = ipv6_defaults.autoconf; 7119 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 7120 7121 dflt->stable_secret.initialized = false; 7122 all->stable_secret.initialized = false; 7123 7124 net->ipv6.devconf_all = all; 7125 net->ipv6.devconf_dflt = dflt; 7126 7127 #ifdef CONFIG_SYSCTL 7128 err = __addrconf_sysctl_register(net, "all", NULL, all); 7129 if (err < 0) 7130 goto err_reg_all; 7131 7132 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 7133 if (err < 0) 7134 goto err_reg_dflt; 7135 #endif 7136 return 0; 7137 7138 #ifdef CONFIG_SYSCTL 7139 err_reg_dflt: 7140 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 7141 err_reg_all: 7142 kfree(dflt); 7143 #endif 7144 err_alloc_dflt: 7145 kfree(all); 7146 err_alloc_all: 7147 return err; 7148 } 7149 7150 static void __net_exit addrconf_exit_net(struct net *net) 7151 { 7152 #ifdef CONFIG_SYSCTL 7153 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 7154 NETCONFA_IFINDEX_DEFAULT); 7155 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 7156 NETCONFA_IFINDEX_ALL); 7157 #endif 7158 kfree(net->ipv6.devconf_dflt); 7159 kfree(net->ipv6.devconf_all); 7160 } 7161 7162 static struct pernet_operations addrconf_ops = { 7163 .init = addrconf_init_net, 7164 .exit = addrconf_exit_net, 7165 }; 7166 7167 static struct rtnl_af_ops inet6_ops __read_mostly = { 7168 .family = AF_INET6, 7169 .fill_link_af = inet6_fill_link_af, 7170 .get_link_af_size = inet6_get_link_af_size, 7171 .validate_link_af = inet6_validate_link_af, 7172 .set_link_af = inet6_set_link_af, 7173 }; 7174 7175 /* 7176 * Init / cleanup code 7177 */ 7178 7179 int __init addrconf_init(void) 7180 { 7181 struct inet6_dev *idev; 7182 int i, err; 7183 7184 err = ipv6_addr_label_init(); 7185 if (err < 0) { 7186 pr_crit("%s: cannot initialize default policy table: %d\n", 7187 __func__, err); 7188 goto out; 7189 } 7190 7191 err = register_pernet_subsys(&addrconf_ops); 7192 if (err < 0) 7193 goto out_addrlabel; 7194 7195 addrconf_wq = create_workqueue("ipv6_addrconf"); 7196 if (!addrconf_wq) { 7197 err = -ENOMEM; 7198 goto out_nowq; 7199 } 7200 7201 /* The addrconf netdev notifier requires that loopback_dev 7202 * has it's ipv6 private information allocated and setup 7203 * before it can bring up and give link-local addresses 7204 * to other devices which are up. 7205 * 7206 * Unfortunately, loopback_dev is not necessarily the first 7207 * entry in the global dev_base list of net devices. In fact, 7208 * it is likely to be the very last entry on that list. 7209 * So this causes the notifier registry below to try and 7210 * give link-local addresses to all devices besides loopback_dev 7211 * first, then loopback_dev, which cases all the non-loopback_dev 7212 * devices to fail to get a link-local address. 7213 * 7214 * So, as a temporary fix, allocate the ipv6 structure for 7215 * loopback_dev first by hand. 7216 * Longer term, all of the dependencies ipv6 has upon the loopback 7217 * device and it being up should be removed. 7218 */ 7219 rtnl_lock(); 7220 idev = ipv6_add_dev(init_net.loopback_dev); 7221 rtnl_unlock(); 7222 if (IS_ERR(idev)) { 7223 err = PTR_ERR(idev); 7224 goto errlo; 7225 } 7226 7227 ip6_route_init_special_entries(); 7228 7229 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7230 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 7231 7232 register_netdevice_notifier(&ipv6_dev_notf); 7233 7234 addrconf_verify(); 7235 7236 rtnl_af_register(&inet6_ops); 7237 7238 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK, 7239 NULL, inet6_dump_ifinfo, 0); 7240 if (err < 0) 7241 goto errout; 7242 7243 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR, 7244 inet6_rtm_newaddr, NULL, 0); 7245 if (err < 0) 7246 goto errout; 7247 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR, 7248 inet6_rtm_deladdr, NULL, 0); 7249 if (err < 0) 7250 goto errout; 7251 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR, 7252 inet6_rtm_getaddr, inet6_dump_ifaddr, 7253 RTNL_FLAG_DOIT_UNLOCKED); 7254 if (err < 0) 7255 goto errout; 7256 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST, 7257 NULL, inet6_dump_ifmcaddr, 0); 7258 if (err < 0) 7259 goto errout; 7260 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST, 7261 NULL, inet6_dump_ifacaddr, 0); 7262 if (err < 0) 7263 goto errout; 7264 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF, 7265 inet6_netconf_get_devconf, 7266 inet6_netconf_dump_devconf, 7267 RTNL_FLAG_DOIT_UNLOCKED); 7268 if (err < 0) 7269 goto errout; 7270 err = ipv6_addr_label_rtnl_register(); 7271 if (err < 0) 7272 goto errout; 7273 7274 return 0; 7275 errout: 7276 rtnl_unregister_all(PF_INET6); 7277 rtnl_af_unregister(&inet6_ops); 7278 unregister_netdevice_notifier(&ipv6_dev_notf); 7279 errlo: 7280 destroy_workqueue(addrconf_wq); 7281 out_nowq: 7282 unregister_pernet_subsys(&addrconf_ops); 7283 out_addrlabel: 7284 ipv6_addr_label_cleanup(); 7285 out: 7286 return err; 7287 } 7288 7289 void addrconf_cleanup(void) 7290 { 7291 struct net_device *dev; 7292 int i; 7293 7294 unregister_netdevice_notifier(&ipv6_dev_notf); 7295 unregister_pernet_subsys(&addrconf_ops); 7296 ipv6_addr_label_cleanup(); 7297 7298 rtnl_af_unregister(&inet6_ops); 7299 7300 rtnl_lock(); 7301 7302 /* clean dev list */ 7303 for_each_netdev(&init_net, dev) { 7304 if (__in6_dev_get(dev) == NULL) 7305 continue; 7306 addrconf_ifdown(dev, true); 7307 } 7308 addrconf_ifdown(init_net.loopback_dev, true); 7309 7310 /* 7311 * Check hash table. 7312 */ 7313 spin_lock_bh(&addrconf_hash_lock); 7314 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7315 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 7316 spin_unlock_bh(&addrconf_hash_lock); 7317 cancel_delayed_work(&addr_chk_work); 7318 rtnl_unlock(); 7319 7320 destroy_workqueue(addrconf_wq); 7321 } 7322