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 .ndisc_evict_nocarrier = 1, 245 }; 246 247 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 248 .forwarding = 0, 249 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 250 .mtu6 = IPV6_MIN_MTU, 251 .accept_ra = 1, 252 .accept_redirects = 1, 253 .autoconf = 1, 254 .force_mld_version = 0, 255 .mldv1_unsolicited_report_interval = 10 * HZ, 256 .mldv2_unsolicited_report_interval = HZ, 257 .dad_transmits = 1, 258 .rtr_solicits = MAX_RTR_SOLICITATIONS, 259 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 260 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 261 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 262 .use_tempaddr = 0, 263 .temp_valid_lft = TEMP_VALID_LIFETIME, 264 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 265 .regen_max_retry = REGEN_MAX_RETRY, 266 .max_desync_factor = MAX_DESYNC_FACTOR, 267 .max_addresses = IPV6_MAX_ADDRESSES, 268 .accept_ra_defrtr = 1, 269 .ra_defrtr_metric = IP6_RT_PRIO_USER, 270 .accept_ra_from_local = 0, 271 .accept_ra_min_hop_limit= 1, 272 .accept_ra_pinfo = 1, 273 #ifdef CONFIG_IPV6_ROUTER_PREF 274 .accept_ra_rtr_pref = 1, 275 .rtr_probe_interval = 60 * HZ, 276 #ifdef CONFIG_IPV6_ROUTE_INFO 277 .accept_ra_rt_info_min_plen = 0, 278 .accept_ra_rt_info_max_plen = 0, 279 #endif 280 #endif 281 .proxy_ndp = 0, 282 .accept_source_route = 0, /* we do not accept RH0 by default. */ 283 .disable_ipv6 = 0, 284 .accept_dad = 1, 285 .suppress_frag_ndisc = 1, 286 .accept_ra_mtu = 1, 287 .stable_secret = { 288 .initialized = false, 289 }, 290 .use_oif_addrs_only = 0, 291 .ignore_routes_with_linkdown = 0, 292 .keep_addr_on_down = 0, 293 .seg6_enabled = 0, 294 #ifdef CONFIG_IPV6_SEG6_HMAC 295 .seg6_require_hmac = 0, 296 #endif 297 .enhanced_dad = 1, 298 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 299 .disable_policy = 0, 300 .rpl_seg_enabled = 0, 301 .ioam6_enabled = 0, 302 .ioam6_id = IOAM6_DEFAULT_IF_ID, 303 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE, 304 .ndisc_evict_nocarrier = 1, 305 }; 306 307 /* Check if link is ready: is it up and is a valid qdisc available */ 308 static inline bool addrconf_link_ready(const struct net_device *dev) 309 { 310 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev); 311 } 312 313 static void addrconf_del_rs_timer(struct inet6_dev *idev) 314 { 315 if (del_timer(&idev->rs_timer)) 316 __in6_dev_put(idev); 317 } 318 319 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 320 { 321 if (cancel_delayed_work(&ifp->dad_work)) 322 __in6_ifa_put(ifp); 323 } 324 325 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 326 unsigned long when) 327 { 328 if (!timer_pending(&idev->rs_timer)) 329 in6_dev_hold(idev); 330 mod_timer(&idev->rs_timer, jiffies + when); 331 } 332 333 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 334 unsigned long delay) 335 { 336 in6_ifa_hold(ifp); 337 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay)) 338 in6_ifa_put(ifp); 339 } 340 341 static int snmp6_alloc_dev(struct inet6_dev *idev) 342 { 343 int i; 344 345 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib); 346 if (!idev->stats.ipv6) 347 goto err_ip; 348 349 for_each_possible_cpu(i) { 350 struct ipstats_mib *addrconf_stats; 351 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 352 u64_stats_init(&addrconf_stats->syncp); 353 } 354 355 356 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 357 GFP_KERNEL); 358 if (!idev->stats.icmpv6dev) 359 goto err_icmp; 360 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 361 GFP_KERNEL); 362 if (!idev->stats.icmpv6msgdev) 363 goto err_icmpmsg; 364 365 return 0; 366 367 err_icmpmsg: 368 kfree(idev->stats.icmpv6dev); 369 err_icmp: 370 free_percpu(idev->stats.ipv6); 371 err_ip: 372 return -ENOMEM; 373 } 374 375 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 376 { 377 struct inet6_dev *ndev; 378 int err = -ENOMEM; 379 380 ASSERT_RTNL(); 381 382 if (dev->mtu < IPV6_MIN_MTU) 383 return ERR_PTR(-EINVAL); 384 385 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 386 if (!ndev) 387 return ERR_PTR(err); 388 389 rwlock_init(&ndev->lock); 390 ndev->dev = dev; 391 INIT_LIST_HEAD(&ndev->addr_list); 392 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0); 393 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 394 395 if (ndev->cnf.stable_secret.initialized) 396 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 397 398 ndev->cnf.mtu6 = dev->mtu; 399 ndev->ra_mtu = 0; 400 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 401 if (!ndev->nd_parms) { 402 kfree(ndev); 403 return ERR_PTR(err); 404 } 405 if (ndev->cnf.forwarding) 406 dev_disable_lro(dev); 407 /* We refer to the device */ 408 dev_hold(dev); 409 410 if (snmp6_alloc_dev(ndev) < 0) { 411 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n", 412 __func__); 413 neigh_parms_release(&nd_tbl, ndev->nd_parms); 414 dev_put(dev); 415 kfree(ndev); 416 return ERR_PTR(err); 417 } 418 419 if (snmp6_register_dev(ndev) < 0) { 420 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n", 421 __func__, dev->name); 422 goto err_release; 423 } 424 425 /* One reference from device. */ 426 refcount_set(&ndev->refcnt, 1); 427 428 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 429 ndev->cnf.accept_dad = -1; 430 431 #if IS_ENABLED(CONFIG_IPV6_SIT) 432 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 433 pr_info("%s: Disabled Multicast RS\n", dev->name); 434 ndev->cnf.rtr_solicits = 0; 435 } 436 #endif 437 438 INIT_LIST_HEAD(&ndev->tempaddr_list); 439 ndev->desync_factor = U32_MAX; 440 if ((dev->flags&IFF_LOOPBACK) || 441 dev->type == ARPHRD_TUNNEL || 442 dev->type == ARPHRD_TUNNEL6 || 443 dev->type == ARPHRD_SIT || 444 dev->type == ARPHRD_NONE) { 445 ndev->cnf.use_tempaddr = -1; 446 } 447 448 ndev->token = in6addr_any; 449 450 if (netif_running(dev) && addrconf_link_ready(dev)) 451 ndev->if_flags |= IF_READY; 452 453 ipv6_mc_init_dev(ndev); 454 ndev->tstamp = jiffies; 455 err = addrconf_sysctl_register(ndev); 456 if (err) { 457 ipv6_mc_destroy_dev(ndev); 458 snmp6_unregister_dev(ndev); 459 goto err_release; 460 } 461 /* protected by rtnl_lock */ 462 rcu_assign_pointer(dev->ip6_ptr, ndev); 463 464 /* Join interface-local all-node multicast group */ 465 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 466 467 /* Join all-node multicast group */ 468 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 469 470 /* Join all-router multicast group if forwarding is set */ 471 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 472 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 473 474 return ndev; 475 476 err_release: 477 neigh_parms_release(&nd_tbl, ndev->nd_parms); 478 ndev->dead = 1; 479 in6_dev_finish_destroy(ndev); 480 return ERR_PTR(err); 481 } 482 483 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 484 { 485 struct inet6_dev *idev; 486 487 ASSERT_RTNL(); 488 489 idev = __in6_dev_get(dev); 490 if (!idev) { 491 idev = ipv6_add_dev(dev); 492 if (IS_ERR(idev)) 493 return idev; 494 } 495 496 if (dev->flags&IFF_UP) 497 ipv6_mc_up(idev); 498 return idev; 499 } 500 501 static int inet6_netconf_msgsize_devconf(int type) 502 { 503 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 504 + nla_total_size(4); /* NETCONFA_IFINDEX */ 505 bool all = false; 506 507 if (type == NETCONFA_ALL) 508 all = true; 509 510 if (all || type == NETCONFA_FORWARDING) 511 size += nla_total_size(4); 512 #ifdef CONFIG_IPV6_MROUTE 513 if (all || type == NETCONFA_MC_FORWARDING) 514 size += nla_total_size(4); 515 #endif 516 if (all || type == NETCONFA_PROXY_NEIGH) 517 size += nla_total_size(4); 518 519 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 520 size += nla_total_size(4); 521 522 return size; 523 } 524 525 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 526 struct ipv6_devconf *devconf, u32 portid, 527 u32 seq, int event, unsigned int flags, 528 int type) 529 { 530 struct nlmsghdr *nlh; 531 struct netconfmsg *ncm; 532 bool all = false; 533 534 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 535 flags); 536 if (!nlh) 537 return -EMSGSIZE; 538 539 if (type == NETCONFA_ALL) 540 all = true; 541 542 ncm = nlmsg_data(nlh); 543 ncm->ncm_family = AF_INET6; 544 545 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 546 goto nla_put_failure; 547 548 if (!devconf) 549 goto out; 550 551 if ((all || type == NETCONFA_FORWARDING) && 552 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 553 goto nla_put_failure; 554 #ifdef CONFIG_IPV6_MROUTE 555 if ((all || type == NETCONFA_MC_FORWARDING) && 556 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 557 devconf->mc_forwarding) < 0) 558 goto nla_put_failure; 559 #endif 560 if ((all || type == NETCONFA_PROXY_NEIGH) && 561 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 562 goto nla_put_failure; 563 564 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 565 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 566 devconf->ignore_routes_with_linkdown) < 0) 567 goto nla_put_failure; 568 569 out: 570 nlmsg_end(skb, nlh); 571 return 0; 572 573 nla_put_failure: 574 nlmsg_cancel(skb, nlh); 575 return -EMSGSIZE; 576 } 577 578 void inet6_netconf_notify_devconf(struct net *net, int event, int type, 579 int ifindex, struct ipv6_devconf *devconf) 580 { 581 struct sk_buff *skb; 582 int err = -ENOBUFS; 583 584 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL); 585 if (!skb) 586 goto errout; 587 588 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 589 event, 0, type); 590 if (err < 0) { 591 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 592 WARN_ON(err == -EMSGSIZE); 593 kfree_skb(skb); 594 goto errout; 595 } 596 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL); 597 return; 598 errout: 599 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 600 } 601 602 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 603 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 604 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 605 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 606 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 607 }; 608 609 static int inet6_netconf_valid_get_req(struct sk_buff *skb, 610 const struct nlmsghdr *nlh, 611 struct nlattr **tb, 612 struct netlink_ext_ack *extack) 613 { 614 int i, err; 615 616 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) { 617 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request"); 618 return -EINVAL; 619 } 620 621 if (!netlink_strict_get_check(skb)) 622 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg), 623 tb, NETCONFA_MAX, 624 devconf_ipv6_policy, extack); 625 626 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg), 627 tb, NETCONFA_MAX, 628 devconf_ipv6_policy, extack); 629 if (err) 630 return err; 631 632 for (i = 0; i <= NETCONFA_MAX; i++) { 633 if (!tb[i]) 634 continue; 635 636 switch (i) { 637 case NETCONFA_IFINDEX: 638 break; 639 default: 640 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request"); 641 return -EINVAL; 642 } 643 } 644 645 return 0; 646 } 647 648 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 649 struct nlmsghdr *nlh, 650 struct netlink_ext_ack *extack) 651 { 652 struct net *net = sock_net(in_skb->sk); 653 struct nlattr *tb[NETCONFA_MAX+1]; 654 struct inet6_dev *in6_dev = NULL; 655 struct net_device *dev = NULL; 656 struct sk_buff *skb; 657 struct ipv6_devconf *devconf; 658 int ifindex; 659 int err; 660 661 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack); 662 if (err < 0) 663 return err; 664 665 if (!tb[NETCONFA_IFINDEX]) 666 return -EINVAL; 667 668 err = -EINVAL; 669 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 670 switch (ifindex) { 671 case NETCONFA_IFINDEX_ALL: 672 devconf = net->ipv6.devconf_all; 673 break; 674 case NETCONFA_IFINDEX_DEFAULT: 675 devconf = net->ipv6.devconf_dflt; 676 break; 677 default: 678 dev = dev_get_by_index(net, ifindex); 679 if (!dev) 680 return -EINVAL; 681 in6_dev = in6_dev_get(dev); 682 if (!in6_dev) 683 goto errout; 684 devconf = &in6_dev->cnf; 685 break; 686 } 687 688 err = -ENOBUFS; 689 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); 690 if (!skb) 691 goto errout; 692 693 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 694 NETLINK_CB(in_skb).portid, 695 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 696 NETCONFA_ALL); 697 if (err < 0) { 698 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 699 WARN_ON(err == -EMSGSIZE); 700 kfree_skb(skb); 701 goto errout; 702 } 703 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 704 errout: 705 if (in6_dev) 706 in6_dev_put(in6_dev); 707 dev_put(dev); 708 return err; 709 } 710 711 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 712 struct netlink_callback *cb) 713 { 714 const struct nlmsghdr *nlh = cb->nlh; 715 struct net *net = sock_net(skb->sk); 716 int h, s_h; 717 int idx, s_idx; 718 struct net_device *dev; 719 struct inet6_dev *idev; 720 struct hlist_head *head; 721 722 if (cb->strict_check) { 723 struct netlink_ext_ack *extack = cb->extack; 724 struct netconfmsg *ncm; 725 726 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) { 727 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request"); 728 return -EINVAL; 729 } 730 731 if (nlmsg_attrlen(nlh, sizeof(*ncm))) { 732 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request"); 733 return -EINVAL; 734 } 735 } 736 737 s_h = cb->args[0]; 738 s_idx = idx = cb->args[1]; 739 740 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 741 idx = 0; 742 head = &net->dev_index_head[h]; 743 rcu_read_lock(); 744 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 745 net->dev_base_seq; 746 hlist_for_each_entry_rcu(dev, head, index_hlist) { 747 if (idx < s_idx) 748 goto cont; 749 idev = __in6_dev_get(dev); 750 if (!idev) 751 goto cont; 752 753 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 754 &idev->cnf, 755 NETLINK_CB(cb->skb).portid, 756 nlh->nlmsg_seq, 757 RTM_NEWNETCONF, 758 NLM_F_MULTI, 759 NETCONFA_ALL) < 0) { 760 rcu_read_unlock(); 761 goto done; 762 } 763 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 764 cont: 765 idx++; 766 } 767 rcu_read_unlock(); 768 } 769 if (h == NETDEV_HASHENTRIES) { 770 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 771 net->ipv6.devconf_all, 772 NETLINK_CB(cb->skb).portid, 773 nlh->nlmsg_seq, 774 RTM_NEWNETCONF, NLM_F_MULTI, 775 NETCONFA_ALL) < 0) 776 goto done; 777 else 778 h++; 779 } 780 if (h == NETDEV_HASHENTRIES + 1) { 781 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 782 net->ipv6.devconf_dflt, 783 NETLINK_CB(cb->skb).portid, 784 nlh->nlmsg_seq, 785 RTM_NEWNETCONF, NLM_F_MULTI, 786 NETCONFA_ALL) < 0) 787 goto done; 788 else 789 h++; 790 } 791 done: 792 cb->args[0] = h; 793 cb->args[1] = idx; 794 795 return skb->len; 796 } 797 798 #ifdef CONFIG_SYSCTL 799 static void dev_forward_change(struct inet6_dev *idev) 800 { 801 struct net_device *dev; 802 struct inet6_ifaddr *ifa; 803 804 if (!idev) 805 return; 806 dev = idev->dev; 807 if (idev->cnf.forwarding) 808 dev_disable_lro(dev); 809 if (dev->flags & IFF_MULTICAST) { 810 if (idev->cnf.forwarding) { 811 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 812 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 813 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 814 } else { 815 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 816 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 817 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 818 } 819 } 820 821 list_for_each_entry(ifa, &idev->addr_list, if_list) { 822 if (ifa->flags&IFA_F_TENTATIVE) 823 continue; 824 if (idev->cnf.forwarding) 825 addrconf_join_anycast(ifa); 826 else 827 addrconf_leave_anycast(ifa); 828 } 829 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, 830 NETCONFA_FORWARDING, 831 dev->ifindex, &idev->cnf); 832 } 833 834 835 static void addrconf_forward_change(struct net *net, __s32 newf) 836 { 837 struct net_device *dev; 838 struct inet6_dev *idev; 839 840 for_each_netdev(net, dev) { 841 idev = __in6_dev_get(dev); 842 if (idev) { 843 int changed = (!idev->cnf.forwarding) ^ (!newf); 844 idev->cnf.forwarding = newf; 845 if (changed) 846 dev_forward_change(idev); 847 } 848 } 849 } 850 851 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 852 { 853 struct net *net; 854 int old; 855 856 if (!rtnl_trylock()) 857 return restart_syscall(); 858 859 net = (struct net *)table->extra2; 860 old = *p; 861 *p = newf; 862 863 if (p == &net->ipv6.devconf_dflt->forwarding) { 864 if ((!newf) ^ (!old)) 865 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 866 NETCONFA_FORWARDING, 867 NETCONFA_IFINDEX_DEFAULT, 868 net->ipv6.devconf_dflt); 869 rtnl_unlock(); 870 return 0; 871 } 872 873 if (p == &net->ipv6.devconf_all->forwarding) { 874 int old_dflt = net->ipv6.devconf_dflt->forwarding; 875 876 net->ipv6.devconf_dflt->forwarding = newf; 877 if ((!newf) ^ (!old_dflt)) 878 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 879 NETCONFA_FORWARDING, 880 NETCONFA_IFINDEX_DEFAULT, 881 net->ipv6.devconf_dflt); 882 883 addrconf_forward_change(net, newf); 884 if ((!newf) ^ (!old)) 885 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 886 NETCONFA_FORWARDING, 887 NETCONFA_IFINDEX_ALL, 888 net->ipv6.devconf_all); 889 } else if ((!newf) ^ (!old)) 890 dev_forward_change((struct inet6_dev *)table->extra1); 891 rtnl_unlock(); 892 893 if (newf) 894 rt6_purge_dflt_routers(net); 895 return 1; 896 } 897 898 static void addrconf_linkdown_change(struct net *net, __s32 newf) 899 { 900 struct net_device *dev; 901 struct inet6_dev *idev; 902 903 for_each_netdev(net, dev) { 904 idev = __in6_dev_get(dev); 905 if (idev) { 906 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 907 908 idev->cnf.ignore_routes_with_linkdown = newf; 909 if (changed) 910 inet6_netconf_notify_devconf(dev_net(dev), 911 RTM_NEWNETCONF, 912 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 913 dev->ifindex, 914 &idev->cnf); 915 } 916 } 917 } 918 919 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 920 { 921 struct net *net; 922 int old; 923 924 if (!rtnl_trylock()) 925 return restart_syscall(); 926 927 net = (struct net *)table->extra2; 928 old = *p; 929 *p = newf; 930 931 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 932 if ((!newf) ^ (!old)) 933 inet6_netconf_notify_devconf(net, 934 RTM_NEWNETCONF, 935 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 936 NETCONFA_IFINDEX_DEFAULT, 937 net->ipv6.devconf_dflt); 938 rtnl_unlock(); 939 return 0; 940 } 941 942 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 943 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 944 addrconf_linkdown_change(net, newf); 945 if ((!newf) ^ (!old)) 946 inet6_netconf_notify_devconf(net, 947 RTM_NEWNETCONF, 948 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 949 NETCONFA_IFINDEX_ALL, 950 net->ipv6.devconf_all); 951 } 952 rtnl_unlock(); 953 954 return 1; 955 } 956 957 #endif 958 959 /* Nobody refers to this ifaddr, destroy it */ 960 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 961 { 962 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 963 964 #ifdef NET_REFCNT_DEBUG 965 pr_debug("%s\n", __func__); 966 #endif 967 968 in6_dev_put(ifp->idev); 969 970 if (cancel_delayed_work(&ifp->dad_work)) 971 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 972 ifp); 973 974 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 975 pr_warn("Freeing alive inet6 address %p\n", ifp); 976 return; 977 } 978 979 kfree_rcu(ifp, rcu); 980 } 981 982 static void 983 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 984 { 985 struct list_head *p; 986 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 987 988 /* 989 * Each device address list is sorted in order of scope - 990 * global before linklocal. 991 */ 992 list_for_each(p, &idev->addr_list) { 993 struct inet6_ifaddr *ifa 994 = list_entry(p, struct inet6_ifaddr, if_list); 995 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 996 break; 997 } 998 999 list_add_tail_rcu(&ifp->if_list, p); 1000 } 1001 1002 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr) 1003 { 1004 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net); 1005 1006 return hash_32(val, IN6_ADDR_HSIZE_SHIFT); 1007 } 1008 1009 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1010 struct net_device *dev, unsigned int hash) 1011 { 1012 struct inet6_ifaddr *ifp; 1013 1014 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1015 if (!net_eq(dev_net(ifp->idev->dev), net)) 1016 continue; 1017 if (ipv6_addr_equal(&ifp->addr, addr)) { 1018 if (!dev || ifp->idev->dev == dev) 1019 return true; 1020 } 1021 } 1022 return false; 1023 } 1024 1025 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa) 1026 { 1027 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr); 1028 int err = 0; 1029 1030 spin_lock(&addrconf_hash_lock); 1031 1032 /* Ignore adding duplicate addresses on an interface */ 1033 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) { 1034 netdev_dbg(dev, "ipv6_add_addr: already assigned\n"); 1035 err = -EEXIST; 1036 } else { 1037 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 1038 } 1039 1040 spin_unlock(&addrconf_hash_lock); 1041 1042 return err; 1043 } 1044 1045 /* On success it returns ifp with increased reference count */ 1046 1047 static struct inet6_ifaddr * 1048 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg, 1049 bool can_block, struct netlink_ext_ack *extack) 1050 { 1051 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC; 1052 int addr_type = ipv6_addr_type(cfg->pfx); 1053 struct net *net = dev_net(idev->dev); 1054 struct inet6_ifaddr *ifa = NULL; 1055 struct fib6_info *f6i = NULL; 1056 int err = 0; 1057 1058 if (addr_type == IPV6_ADDR_ANY || 1059 (addr_type & IPV6_ADDR_MULTICAST && 1060 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) || 1061 (!(idev->dev->flags & IFF_LOOPBACK) && 1062 !netif_is_l3_master(idev->dev) && 1063 addr_type & IPV6_ADDR_LOOPBACK)) 1064 return ERR_PTR(-EADDRNOTAVAIL); 1065 1066 if (idev->dead) { 1067 err = -ENODEV; /*XXX*/ 1068 goto out; 1069 } 1070 1071 if (idev->cnf.disable_ipv6) { 1072 err = -EACCES; 1073 goto out; 1074 } 1075 1076 /* validator notifier needs to be blocking; 1077 * do not call in atomic context 1078 */ 1079 if (can_block) { 1080 struct in6_validator_info i6vi = { 1081 .i6vi_addr = *cfg->pfx, 1082 .i6vi_dev = idev, 1083 .extack = extack, 1084 }; 1085 1086 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi); 1087 err = notifier_to_errno(err); 1088 if (err < 0) 1089 goto out; 1090 } 1091 1092 ifa = kzalloc(sizeof(*ifa), gfp_flags | __GFP_ACCOUNT); 1093 if (!ifa) { 1094 err = -ENOBUFS; 1095 goto out; 1096 } 1097 1098 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags); 1099 if (IS_ERR(f6i)) { 1100 err = PTR_ERR(f6i); 1101 f6i = NULL; 1102 goto out; 1103 } 1104 1105 if (net->ipv6.devconf_all->disable_policy || 1106 idev->cnf.disable_policy) 1107 f6i->dst_nopolicy = true; 1108 1109 neigh_parms_data_state_setall(idev->nd_parms); 1110 1111 ifa->addr = *cfg->pfx; 1112 if (cfg->peer_pfx) 1113 ifa->peer_addr = *cfg->peer_pfx; 1114 1115 spin_lock_init(&ifa->lock); 1116 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1117 INIT_HLIST_NODE(&ifa->addr_lst); 1118 ifa->scope = cfg->scope; 1119 ifa->prefix_len = cfg->plen; 1120 ifa->rt_priority = cfg->rt_priority; 1121 ifa->flags = cfg->ifa_flags; 1122 /* No need to add the TENTATIVE flag for addresses with NODAD */ 1123 if (!(cfg->ifa_flags & IFA_F_NODAD)) 1124 ifa->flags |= IFA_F_TENTATIVE; 1125 ifa->valid_lft = cfg->valid_lft; 1126 ifa->prefered_lft = cfg->preferred_lft; 1127 ifa->cstamp = ifa->tstamp = jiffies; 1128 ifa->tokenized = false; 1129 1130 ifa->rt = f6i; 1131 1132 ifa->idev = idev; 1133 in6_dev_hold(idev); 1134 1135 /* For caller */ 1136 refcount_set(&ifa->refcnt, 1); 1137 1138 rcu_read_lock_bh(); 1139 1140 err = ipv6_add_addr_hash(idev->dev, ifa); 1141 if (err < 0) { 1142 rcu_read_unlock_bh(); 1143 goto out; 1144 } 1145 1146 write_lock(&idev->lock); 1147 1148 /* Add to inet6_dev unicast addr list. */ 1149 ipv6_link_dev_addr(idev, ifa); 1150 1151 if (ifa->flags&IFA_F_TEMPORARY) { 1152 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1153 in6_ifa_hold(ifa); 1154 } 1155 1156 in6_ifa_hold(ifa); 1157 write_unlock(&idev->lock); 1158 1159 rcu_read_unlock_bh(); 1160 1161 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1162 out: 1163 if (unlikely(err < 0)) { 1164 fib6_info_release(f6i); 1165 1166 if (ifa) { 1167 if (ifa->idev) 1168 in6_dev_put(ifa->idev); 1169 kfree(ifa); 1170 } 1171 ifa = ERR_PTR(err); 1172 } 1173 1174 return ifa; 1175 } 1176 1177 enum cleanup_prefix_rt_t { 1178 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1179 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1180 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1181 }; 1182 1183 /* 1184 * Check, whether the prefix for ifp would still need a prefix route 1185 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1186 * constants. 1187 * 1188 * 1) we don't purge prefix if address was not permanent. 1189 * prefix is managed by its own lifetime. 1190 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1191 * 3) if there are no addresses, delete prefix. 1192 * 4) if there are still other permanent address(es), 1193 * corresponding prefix is still permanent. 1194 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1195 * don't purge the prefix, assume user space is managing it. 1196 * 6) otherwise, update prefix lifetime to the 1197 * longest valid lifetime among the corresponding 1198 * addresses on the device. 1199 * Note: subsequent RA will update lifetime. 1200 **/ 1201 static enum cleanup_prefix_rt_t 1202 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1203 { 1204 struct inet6_ifaddr *ifa; 1205 struct inet6_dev *idev = ifp->idev; 1206 unsigned long lifetime; 1207 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1208 1209 *expires = jiffies; 1210 1211 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1212 if (ifa == ifp) 1213 continue; 1214 if (ifa->prefix_len != ifp->prefix_len || 1215 !ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1216 ifp->prefix_len)) 1217 continue; 1218 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1219 return CLEANUP_PREFIX_RT_NOP; 1220 1221 action = CLEANUP_PREFIX_RT_EXPIRE; 1222 1223 spin_lock(&ifa->lock); 1224 1225 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1226 /* 1227 * Note: Because this address is 1228 * not permanent, lifetime < 1229 * LONG_MAX / HZ here. 1230 */ 1231 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1232 *expires = ifa->tstamp + lifetime * HZ; 1233 spin_unlock(&ifa->lock); 1234 } 1235 1236 return action; 1237 } 1238 1239 static void 1240 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, 1241 bool del_rt, bool del_peer) 1242 { 1243 struct fib6_info *f6i; 1244 1245 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr, 1246 ifp->prefix_len, 1247 ifp->idev->dev, 0, RTF_DEFAULT, true); 1248 if (f6i) { 1249 if (del_rt) 1250 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 1251 else { 1252 if (!(f6i->fib6_flags & RTF_EXPIRES)) 1253 fib6_set_expires(f6i, expires); 1254 fib6_info_release(f6i); 1255 } 1256 } 1257 } 1258 1259 1260 /* This function wants to get referenced ifp and releases it before return */ 1261 1262 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1263 { 1264 int state; 1265 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1266 unsigned long expires; 1267 1268 ASSERT_RTNL(); 1269 1270 spin_lock_bh(&ifp->lock); 1271 state = ifp->state; 1272 ifp->state = INET6_IFADDR_STATE_DEAD; 1273 spin_unlock_bh(&ifp->lock); 1274 1275 if (state == INET6_IFADDR_STATE_DEAD) 1276 goto out; 1277 1278 spin_lock_bh(&addrconf_hash_lock); 1279 hlist_del_init_rcu(&ifp->addr_lst); 1280 spin_unlock_bh(&addrconf_hash_lock); 1281 1282 write_lock_bh(&ifp->idev->lock); 1283 1284 if (ifp->flags&IFA_F_TEMPORARY) { 1285 list_del(&ifp->tmp_list); 1286 if (ifp->ifpub) { 1287 in6_ifa_put(ifp->ifpub); 1288 ifp->ifpub = NULL; 1289 } 1290 __in6_ifa_put(ifp); 1291 } 1292 1293 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1294 action = check_cleanup_prefix_route(ifp, &expires); 1295 1296 list_del_rcu(&ifp->if_list); 1297 __in6_ifa_put(ifp); 1298 1299 write_unlock_bh(&ifp->idev->lock); 1300 1301 addrconf_del_dad_work(ifp); 1302 1303 ipv6_ifa_notify(RTM_DELADDR, ifp); 1304 1305 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1306 1307 if (action != CLEANUP_PREFIX_RT_NOP) { 1308 cleanup_prefix_route(ifp, expires, 1309 action == CLEANUP_PREFIX_RT_DEL, false); 1310 } 1311 1312 /* clean up prefsrc entries */ 1313 rt6_remove_prefsrc(ifp); 1314 out: 1315 in6_ifa_put(ifp); 1316 } 1317 1318 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block) 1319 { 1320 struct inet6_dev *idev = ifp->idev; 1321 unsigned long tmp_tstamp, age; 1322 unsigned long regen_advance; 1323 unsigned long now = jiffies; 1324 s32 cnf_temp_preferred_lft; 1325 struct inet6_ifaddr *ift; 1326 struct ifa6_config cfg; 1327 long max_desync_factor; 1328 struct in6_addr addr; 1329 int ret = 0; 1330 1331 write_lock_bh(&idev->lock); 1332 1333 retry: 1334 in6_dev_hold(idev); 1335 if (idev->cnf.use_tempaddr <= 0) { 1336 write_unlock_bh(&idev->lock); 1337 pr_info("%s: use_tempaddr is disabled\n", __func__); 1338 in6_dev_put(idev); 1339 ret = -1; 1340 goto out; 1341 } 1342 spin_lock_bh(&ifp->lock); 1343 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1344 idev->cnf.use_tempaddr = -1; /*XXX*/ 1345 spin_unlock_bh(&ifp->lock); 1346 write_unlock_bh(&idev->lock); 1347 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1348 __func__); 1349 in6_dev_put(idev); 1350 ret = -1; 1351 goto out; 1352 } 1353 in6_ifa_hold(ifp); 1354 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1355 ipv6_gen_rnd_iid(&addr); 1356 1357 age = (now - ifp->tstamp) / HZ; 1358 1359 regen_advance = idev->cnf.regen_max_retry * 1360 idev->cnf.dad_transmits * 1361 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 1362 1363 /* recalculate max_desync_factor each time and update 1364 * idev->desync_factor if it's larger 1365 */ 1366 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1367 max_desync_factor = min_t(__u32, 1368 idev->cnf.max_desync_factor, 1369 cnf_temp_preferred_lft - regen_advance); 1370 1371 if (unlikely(idev->desync_factor > max_desync_factor)) { 1372 if (max_desync_factor > 0) { 1373 get_random_bytes(&idev->desync_factor, 1374 sizeof(idev->desync_factor)); 1375 idev->desync_factor %= max_desync_factor; 1376 } else { 1377 idev->desync_factor = 0; 1378 } 1379 } 1380 1381 memset(&cfg, 0, sizeof(cfg)); 1382 cfg.valid_lft = min_t(__u32, ifp->valid_lft, 1383 idev->cnf.temp_valid_lft + age); 1384 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor; 1385 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft); 1386 1387 cfg.plen = ifp->prefix_len; 1388 tmp_tstamp = ifp->tstamp; 1389 spin_unlock_bh(&ifp->lock); 1390 1391 write_unlock_bh(&idev->lock); 1392 1393 /* A temporary address is created only if this calculated Preferred 1394 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1395 * an implementation must not create a temporary address with a zero 1396 * Preferred Lifetime. 1397 * Use age calculation as in addrconf_verify to avoid unnecessary 1398 * temporary addresses being generated. 1399 */ 1400 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1401 if (cfg.preferred_lft <= regen_advance + age) { 1402 in6_ifa_put(ifp); 1403 in6_dev_put(idev); 1404 ret = -1; 1405 goto out; 1406 } 1407 1408 cfg.ifa_flags = IFA_F_TEMPORARY; 1409 /* set in addrconf_prefix_rcv() */ 1410 if (ifp->flags & IFA_F_OPTIMISTIC) 1411 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 1412 1413 cfg.pfx = &addr; 1414 cfg.scope = ipv6_addr_scope(cfg.pfx); 1415 1416 ift = ipv6_add_addr(idev, &cfg, block, NULL); 1417 if (IS_ERR(ift)) { 1418 in6_ifa_put(ifp); 1419 in6_dev_put(idev); 1420 pr_info("%s: retry temporary address regeneration\n", __func__); 1421 write_lock_bh(&idev->lock); 1422 goto retry; 1423 } 1424 1425 spin_lock_bh(&ift->lock); 1426 ift->ifpub = ifp; 1427 ift->cstamp = now; 1428 ift->tstamp = tmp_tstamp; 1429 spin_unlock_bh(&ift->lock); 1430 1431 addrconf_dad_start(ift); 1432 in6_ifa_put(ift); 1433 in6_dev_put(idev); 1434 out: 1435 return ret; 1436 } 1437 1438 /* 1439 * Choose an appropriate source address (RFC3484) 1440 */ 1441 enum { 1442 IPV6_SADDR_RULE_INIT = 0, 1443 IPV6_SADDR_RULE_LOCAL, 1444 IPV6_SADDR_RULE_SCOPE, 1445 IPV6_SADDR_RULE_PREFERRED, 1446 #ifdef CONFIG_IPV6_MIP6 1447 IPV6_SADDR_RULE_HOA, 1448 #endif 1449 IPV6_SADDR_RULE_OIF, 1450 IPV6_SADDR_RULE_LABEL, 1451 IPV6_SADDR_RULE_PRIVACY, 1452 IPV6_SADDR_RULE_ORCHID, 1453 IPV6_SADDR_RULE_PREFIX, 1454 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1455 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1456 #endif 1457 IPV6_SADDR_RULE_MAX 1458 }; 1459 1460 struct ipv6_saddr_score { 1461 int rule; 1462 int addr_type; 1463 struct inet6_ifaddr *ifa; 1464 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1465 int scopedist; 1466 int matchlen; 1467 }; 1468 1469 struct ipv6_saddr_dst { 1470 const struct in6_addr *addr; 1471 int ifindex; 1472 int scope; 1473 int label; 1474 unsigned int prefs; 1475 }; 1476 1477 static inline int ipv6_saddr_preferred(int type) 1478 { 1479 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1480 return 1; 1481 return 0; 1482 } 1483 1484 static bool ipv6_use_optimistic_addr(struct net *net, 1485 struct inet6_dev *idev) 1486 { 1487 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1488 if (!idev) 1489 return false; 1490 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1491 return false; 1492 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic) 1493 return false; 1494 1495 return true; 1496 #else 1497 return false; 1498 #endif 1499 } 1500 1501 static bool ipv6_allow_optimistic_dad(struct net *net, 1502 struct inet6_dev *idev) 1503 { 1504 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1505 if (!idev) 1506 return false; 1507 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1508 return false; 1509 1510 return true; 1511 #else 1512 return false; 1513 #endif 1514 } 1515 1516 static int ipv6_get_saddr_eval(struct net *net, 1517 struct ipv6_saddr_score *score, 1518 struct ipv6_saddr_dst *dst, 1519 int i) 1520 { 1521 int ret; 1522 1523 if (i <= score->rule) { 1524 switch (i) { 1525 case IPV6_SADDR_RULE_SCOPE: 1526 ret = score->scopedist; 1527 break; 1528 case IPV6_SADDR_RULE_PREFIX: 1529 ret = score->matchlen; 1530 break; 1531 default: 1532 ret = !!test_bit(i, score->scorebits); 1533 } 1534 goto out; 1535 } 1536 1537 switch (i) { 1538 case IPV6_SADDR_RULE_INIT: 1539 /* Rule 0: remember if hiscore is not ready yet */ 1540 ret = !!score->ifa; 1541 break; 1542 case IPV6_SADDR_RULE_LOCAL: 1543 /* Rule 1: Prefer same address */ 1544 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1545 break; 1546 case IPV6_SADDR_RULE_SCOPE: 1547 /* Rule 2: Prefer appropriate scope 1548 * 1549 * ret 1550 * ^ 1551 * -1 | d 15 1552 * ---+--+-+---> scope 1553 * | 1554 * | d is scope of the destination. 1555 * B-d | \ 1556 * | \ <- smaller scope is better if 1557 * B-15 | \ if scope is enough for destination. 1558 * | ret = B - scope (-1 <= scope >= d <= 15). 1559 * d-C-1 | / 1560 * |/ <- greater is better 1561 * -C / if scope is not enough for destination. 1562 * /| ret = scope - C (-1 <= d < scope <= 15). 1563 * 1564 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1565 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1566 * Assume B = 0 and we get C > 29. 1567 */ 1568 ret = __ipv6_addr_src_scope(score->addr_type); 1569 if (ret >= dst->scope) 1570 ret = -ret; 1571 else 1572 ret -= 128; /* 30 is enough */ 1573 score->scopedist = ret; 1574 break; 1575 case IPV6_SADDR_RULE_PREFERRED: 1576 { 1577 /* Rule 3: Avoid deprecated and optimistic addresses */ 1578 u8 avoid = IFA_F_DEPRECATED; 1579 1580 if (!ipv6_use_optimistic_addr(net, score->ifa->idev)) 1581 avoid |= IFA_F_OPTIMISTIC; 1582 ret = ipv6_saddr_preferred(score->addr_type) || 1583 !(score->ifa->flags & avoid); 1584 break; 1585 } 1586 #ifdef CONFIG_IPV6_MIP6 1587 case IPV6_SADDR_RULE_HOA: 1588 { 1589 /* Rule 4: Prefer home address */ 1590 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1591 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1592 break; 1593 } 1594 #endif 1595 case IPV6_SADDR_RULE_OIF: 1596 /* Rule 5: Prefer outgoing interface */ 1597 ret = (!dst->ifindex || 1598 dst->ifindex == score->ifa->idev->dev->ifindex); 1599 break; 1600 case IPV6_SADDR_RULE_LABEL: 1601 /* Rule 6: Prefer matching label */ 1602 ret = ipv6_addr_label(net, 1603 &score->ifa->addr, score->addr_type, 1604 score->ifa->idev->dev->ifindex) == dst->label; 1605 break; 1606 case IPV6_SADDR_RULE_PRIVACY: 1607 { 1608 /* Rule 7: Prefer public address 1609 * Note: prefer temporary address if use_tempaddr >= 2 1610 */ 1611 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1612 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1613 score->ifa->idev->cnf.use_tempaddr >= 2; 1614 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1615 break; 1616 } 1617 case IPV6_SADDR_RULE_ORCHID: 1618 /* Rule 8-: Prefer ORCHID vs ORCHID or 1619 * non-ORCHID vs non-ORCHID 1620 */ 1621 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1622 ipv6_addr_orchid(dst->addr)); 1623 break; 1624 case IPV6_SADDR_RULE_PREFIX: 1625 /* Rule 8: Use longest matching prefix */ 1626 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1627 if (ret > score->ifa->prefix_len) 1628 ret = score->ifa->prefix_len; 1629 score->matchlen = ret; 1630 break; 1631 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1632 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1633 /* Optimistic addresses still have lower precedence than other 1634 * preferred addresses. 1635 */ 1636 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1637 break; 1638 #endif 1639 default: 1640 ret = 0; 1641 } 1642 1643 if (ret) 1644 __set_bit(i, score->scorebits); 1645 score->rule = i; 1646 out: 1647 return ret; 1648 } 1649 1650 static int __ipv6_dev_get_saddr(struct net *net, 1651 struct ipv6_saddr_dst *dst, 1652 struct inet6_dev *idev, 1653 struct ipv6_saddr_score *scores, 1654 int hiscore_idx) 1655 { 1656 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1657 1658 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) { 1659 int i; 1660 1661 /* 1662 * - Tentative Address (RFC2462 section 5.4) 1663 * - A tentative address is not considered 1664 * "assigned to an interface" in the traditional 1665 * sense, unless it is also flagged as optimistic. 1666 * - Candidate Source Address (section 4) 1667 * - In any case, anycast addresses, multicast 1668 * addresses, and the unspecified address MUST 1669 * NOT be included in a candidate set. 1670 */ 1671 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1672 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1673 continue; 1674 1675 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1676 1677 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1678 score->addr_type & IPV6_ADDR_MULTICAST)) { 1679 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1680 idev->dev->name); 1681 continue; 1682 } 1683 1684 score->rule = -1; 1685 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1686 1687 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1688 int minihiscore, miniscore; 1689 1690 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1691 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1692 1693 if (minihiscore > miniscore) { 1694 if (i == IPV6_SADDR_RULE_SCOPE && 1695 score->scopedist > 0) { 1696 /* 1697 * special case: 1698 * each remaining entry 1699 * has too small (not enough) 1700 * scope, because ifa entries 1701 * are sorted by their scope 1702 * values. 1703 */ 1704 goto out; 1705 } 1706 break; 1707 } else if (minihiscore < miniscore) { 1708 swap(hiscore, score); 1709 hiscore_idx = 1 - hiscore_idx; 1710 1711 /* restore our iterator */ 1712 score->ifa = hiscore->ifa; 1713 1714 break; 1715 } 1716 } 1717 } 1718 out: 1719 return hiscore_idx; 1720 } 1721 1722 static int ipv6_get_saddr_master(struct net *net, 1723 const struct net_device *dst_dev, 1724 const struct net_device *master, 1725 struct ipv6_saddr_dst *dst, 1726 struct ipv6_saddr_score *scores, 1727 int hiscore_idx) 1728 { 1729 struct inet6_dev *idev; 1730 1731 idev = __in6_dev_get(dst_dev); 1732 if (idev) 1733 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1734 scores, hiscore_idx); 1735 1736 idev = __in6_dev_get(master); 1737 if (idev) 1738 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1739 scores, hiscore_idx); 1740 1741 return hiscore_idx; 1742 } 1743 1744 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1745 const struct in6_addr *daddr, unsigned int prefs, 1746 struct in6_addr *saddr) 1747 { 1748 struct ipv6_saddr_score scores[2], *hiscore; 1749 struct ipv6_saddr_dst dst; 1750 struct inet6_dev *idev; 1751 struct net_device *dev; 1752 int dst_type; 1753 bool use_oif_addr = false; 1754 int hiscore_idx = 0; 1755 int ret = 0; 1756 1757 dst_type = __ipv6_addr_type(daddr); 1758 dst.addr = daddr; 1759 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1760 dst.scope = __ipv6_addr_src_scope(dst_type); 1761 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1762 dst.prefs = prefs; 1763 1764 scores[hiscore_idx].rule = -1; 1765 scores[hiscore_idx].ifa = NULL; 1766 1767 rcu_read_lock(); 1768 1769 /* Candidate Source Address (section 4) 1770 * - multicast and link-local destination address, 1771 * the set of candidate source address MUST only 1772 * include addresses assigned to interfaces 1773 * belonging to the same link as the outgoing 1774 * interface. 1775 * (- For site-local destination addresses, the 1776 * set of candidate source addresses MUST only 1777 * include addresses assigned to interfaces 1778 * belonging to the same site as the outgoing 1779 * interface.) 1780 * - "It is RECOMMENDED that the candidate source addresses 1781 * be the set of unicast addresses assigned to the 1782 * interface that will be used to send to the destination 1783 * (the 'outgoing' interface)." (RFC 6724) 1784 */ 1785 if (dst_dev) { 1786 idev = __in6_dev_get(dst_dev); 1787 if ((dst_type & IPV6_ADDR_MULTICAST) || 1788 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1789 (idev && idev->cnf.use_oif_addrs_only)) { 1790 use_oif_addr = true; 1791 } 1792 } 1793 1794 if (use_oif_addr) { 1795 if (idev) 1796 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1797 } else { 1798 const struct net_device *master; 1799 int master_idx = 0; 1800 1801 /* if dst_dev exists and is enslaved to an L3 device, then 1802 * prefer addresses from dst_dev and then the master over 1803 * any other enslaved devices in the L3 domain. 1804 */ 1805 master = l3mdev_master_dev_rcu(dst_dev); 1806 if (master) { 1807 master_idx = master->ifindex; 1808 1809 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1810 master, &dst, 1811 scores, hiscore_idx); 1812 1813 if (scores[hiscore_idx].ifa) 1814 goto out; 1815 } 1816 1817 for_each_netdev_rcu(net, dev) { 1818 /* only consider addresses on devices in the 1819 * same L3 domain 1820 */ 1821 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1822 continue; 1823 idev = __in6_dev_get(dev); 1824 if (!idev) 1825 continue; 1826 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1827 } 1828 } 1829 1830 out: 1831 hiscore = &scores[hiscore_idx]; 1832 if (!hiscore->ifa) 1833 ret = -EADDRNOTAVAIL; 1834 else 1835 *saddr = hiscore->ifa->addr; 1836 1837 rcu_read_unlock(); 1838 return ret; 1839 } 1840 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1841 1842 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1843 u32 banned_flags) 1844 { 1845 struct inet6_ifaddr *ifp; 1846 int err = -EADDRNOTAVAIL; 1847 1848 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1849 if (ifp->scope > IFA_LINK) 1850 break; 1851 if (ifp->scope == IFA_LINK && 1852 !(ifp->flags & banned_flags)) { 1853 *addr = ifp->addr; 1854 err = 0; 1855 break; 1856 } 1857 } 1858 return err; 1859 } 1860 1861 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1862 u32 banned_flags) 1863 { 1864 struct inet6_dev *idev; 1865 int err = -EADDRNOTAVAIL; 1866 1867 rcu_read_lock(); 1868 idev = __in6_dev_get(dev); 1869 if (idev) { 1870 read_lock_bh(&idev->lock); 1871 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1872 read_unlock_bh(&idev->lock); 1873 } 1874 rcu_read_unlock(); 1875 return err; 1876 } 1877 1878 static int ipv6_count_addresses(const struct inet6_dev *idev) 1879 { 1880 const struct inet6_ifaddr *ifp; 1881 int cnt = 0; 1882 1883 rcu_read_lock(); 1884 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list) 1885 cnt++; 1886 rcu_read_unlock(); 1887 return cnt; 1888 } 1889 1890 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1891 const struct net_device *dev, int strict) 1892 { 1893 return ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1894 strict, IFA_F_TENTATIVE); 1895 } 1896 EXPORT_SYMBOL(ipv6_chk_addr); 1897 1898 /* device argument is used to find the L3 domain of interest. If 1899 * skip_dev_check is set, then the ifp device is not checked against 1900 * the passed in dev argument. So the 2 cases for addresses checks are: 1901 * 1. does the address exist in the L3 domain that dev is part of 1902 * (skip_dev_check = true), or 1903 * 1904 * 2. does the address exist on the specific device 1905 * (skip_dev_check = false) 1906 */ 1907 static struct net_device * 1908 __ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1909 const struct net_device *dev, bool skip_dev_check, 1910 int strict, u32 banned_flags) 1911 { 1912 unsigned int hash = inet6_addr_hash(net, addr); 1913 struct net_device *l3mdev, *ndev; 1914 struct inet6_ifaddr *ifp; 1915 u32 ifp_flags; 1916 1917 rcu_read_lock(); 1918 1919 l3mdev = l3mdev_master_dev_rcu(dev); 1920 if (skip_dev_check) 1921 dev = NULL; 1922 1923 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1924 ndev = ifp->idev->dev; 1925 if (!net_eq(dev_net(ndev), net)) 1926 continue; 1927 1928 if (l3mdev_master_dev_rcu(ndev) != l3mdev) 1929 continue; 1930 1931 /* Decouple optimistic from tentative for evaluation here. 1932 * Ban optimistic addresses explicitly, when required. 1933 */ 1934 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1935 ? (ifp->flags&~IFA_F_TENTATIVE) 1936 : ifp->flags; 1937 if (ipv6_addr_equal(&ifp->addr, addr) && 1938 !(ifp_flags&banned_flags) && 1939 (!dev || ndev == dev || 1940 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1941 rcu_read_unlock(); 1942 return ndev; 1943 } 1944 } 1945 1946 rcu_read_unlock(); 1947 return NULL; 1948 } 1949 1950 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1951 const struct net_device *dev, bool skip_dev_check, 1952 int strict, u32 banned_flags) 1953 { 1954 return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check, 1955 strict, banned_flags) ? 1 : 0; 1956 } 1957 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1958 1959 1960 /* Compares an address/prefix_len with addresses on device @dev. 1961 * If one is found it returns true. 1962 */ 1963 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1964 const unsigned int prefix_len, struct net_device *dev) 1965 { 1966 const struct inet6_ifaddr *ifa; 1967 const struct inet6_dev *idev; 1968 bool ret = false; 1969 1970 rcu_read_lock(); 1971 idev = __in6_dev_get(dev); 1972 if (idev) { 1973 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1974 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1975 if (ret) 1976 break; 1977 } 1978 } 1979 rcu_read_unlock(); 1980 1981 return ret; 1982 } 1983 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1984 1985 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1986 { 1987 const struct inet6_ifaddr *ifa; 1988 const struct inet6_dev *idev; 1989 int onlink; 1990 1991 onlink = 0; 1992 rcu_read_lock(); 1993 idev = __in6_dev_get(dev); 1994 if (idev) { 1995 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1996 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1997 ifa->prefix_len); 1998 if (onlink) 1999 break; 2000 } 2001 } 2002 rcu_read_unlock(); 2003 return onlink; 2004 } 2005 EXPORT_SYMBOL(ipv6_chk_prefix); 2006 2007 /** 2008 * ipv6_dev_find - find the first device with a given source address. 2009 * @net: the net namespace 2010 * @addr: the source address 2011 * @dev: used to find the L3 domain of interest 2012 * 2013 * The caller should be protected by RCU, or RTNL. 2014 */ 2015 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr, 2016 struct net_device *dev) 2017 { 2018 return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1, 2019 IFA_F_TENTATIVE); 2020 } 2021 EXPORT_SYMBOL(ipv6_dev_find); 2022 2023 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 2024 struct net_device *dev, int strict) 2025 { 2026 unsigned int hash = inet6_addr_hash(net, addr); 2027 struct inet6_ifaddr *ifp, *result = NULL; 2028 2029 rcu_read_lock(); 2030 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 2031 if (!net_eq(dev_net(ifp->idev->dev), net)) 2032 continue; 2033 if (ipv6_addr_equal(&ifp->addr, addr)) { 2034 if (!dev || ifp->idev->dev == dev || 2035 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 2036 result = ifp; 2037 in6_ifa_hold(ifp); 2038 break; 2039 } 2040 } 2041 } 2042 rcu_read_unlock(); 2043 2044 return result; 2045 } 2046 2047 /* Gets referenced address, destroys ifaddr */ 2048 2049 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 2050 { 2051 if (dad_failed) 2052 ifp->flags |= IFA_F_DADFAILED; 2053 2054 if (ifp->flags&IFA_F_TEMPORARY) { 2055 struct inet6_ifaddr *ifpub; 2056 spin_lock_bh(&ifp->lock); 2057 ifpub = ifp->ifpub; 2058 if (ifpub) { 2059 in6_ifa_hold(ifpub); 2060 spin_unlock_bh(&ifp->lock); 2061 ipv6_create_tempaddr(ifpub, true); 2062 in6_ifa_put(ifpub); 2063 } else { 2064 spin_unlock_bh(&ifp->lock); 2065 } 2066 ipv6_del_addr(ifp); 2067 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) { 2068 spin_lock_bh(&ifp->lock); 2069 addrconf_del_dad_work(ifp); 2070 ifp->flags |= IFA_F_TENTATIVE; 2071 if (dad_failed) 2072 ifp->flags &= ~IFA_F_OPTIMISTIC; 2073 spin_unlock_bh(&ifp->lock); 2074 if (dad_failed) 2075 ipv6_ifa_notify(0, ifp); 2076 in6_ifa_put(ifp); 2077 } else { 2078 ipv6_del_addr(ifp); 2079 } 2080 } 2081 2082 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 2083 { 2084 int err = -ENOENT; 2085 2086 spin_lock_bh(&ifp->lock); 2087 if (ifp->state == INET6_IFADDR_STATE_DAD) { 2088 ifp->state = INET6_IFADDR_STATE_POSTDAD; 2089 err = 0; 2090 } 2091 spin_unlock_bh(&ifp->lock); 2092 2093 return err; 2094 } 2095 2096 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp) 2097 { 2098 struct inet6_dev *idev = ifp->idev; 2099 struct net *net = dev_net(ifp->idev->dev); 2100 2101 if (addrconf_dad_end(ifp)) { 2102 in6_ifa_put(ifp); 2103 return; 2104 } 2105 2106 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n", 2107 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source); 2108 2109 spin_lock_bh(&ifp->lock); 2110 2111 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 2112 struct in6_addr new_addr; 2113 struct inet6_ifaddr *ifp2; 2114 int retries = ifp->stable_privacy_retry + 1; 2115 struct ifa6_config cfg = { 2116 .pfx = &new_addr, 2117 .plen = ifp->prefix_len, 2118 .ifa_flags = ifp->flags, 2119 .valid_lft = ifp->valid_lft, 2120 .preferred_lft = ifp->prefered_lft, 2121 .scope = ifp->scope, 2122 }; 2123 2124 if (retries > net->ipv6.sysctl.idgen_retries) { 2125 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 2126 ifp->idev->dev->name); 2127 goto errdad; 2128 } 2129 2130 new_addr = ifp->addr; 2131 if (ipv6_generate_stable_address(&new_addr, retries, 2132 idev)) 2133 goto errdad; 2134 2135 spin_unlock_bh(&ifp->lock); 2136 2137 if (idev->cnf.max_addresses && 2138 ipv6_count_addresses(idev) >= 2139 idev->cnf.max_addresses) 2140 goto lock_errdad; 2141 2142 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 2143 ifp->idev->dev->name); 2144 2145 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL); 2146 if (IS_ERR(ifp2)) 2147 goto lock_errdad; 2148 2149 spin_lock_bh(&ifp2->lock); 2150 ifp2->stable_privacy_retry = retries; 2151 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2152 spin_unlock_bh(&ifp2->lock); 2153 2154 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2155 in6_ifa_put(ifp2); 2156 lock_errdad: 2157 spin_lock_bh(&ifp->lock); 2158 } 2159 2160 errdad: 2161 /* transition from _POSTDAD to _ERRDAD */ 2162 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2163 spin_unlock_bh(&ifp->lock); 2164 2165 addrconf_mod_dad_work(ifp, 0); 2166 in6_ifa_put(ifp); 2167 } 2168 2169 /* Join to solicited addr multicast group. 2170 * caller must hold RTNL */ 2171 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2172 { 2173 struct in6_addr maddr; 2174 2175 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2176 return; 2177 2178 addrconf_addr_solict_mult(addr, &maddr); 2179 ipv6_dev_mc_inc(dev, &maddr); 2180 } 2181 2182 /* caller must hold RTNL */ 2183 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2184 { 2185 struct in6_addr maddr; 2186 2187 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2188 return; 2189 2190 addrconf_addr_solict_mult(addr, &maddr); 2191 __ipv6_dev_mc_dec(idev, &maddr); 2192 } 2193 2194 /* caller must hold RTNL */ 2195 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2196 { 2197 struct in6_addr addr; 2198 2199 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2200 return; 2201 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2202 if (ipv6_addr_any(&addr)) 2203 return; 2204 __ipv6_dev_ac_inc(ifp->idev, &addr); 2205 } 2206 2207 /* caller must hold RTNL */ 2208 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2209 { 2210 struct in6_addr addr; 2211 2212 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2213 return; 2214 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2215 if (ipv6_addr_any(&addr)) 2216 return; 2217 __ipv6_dev_ac_dec(ifp->idev, &addr); 2218 } 2219 2220 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2221 { 2222 switch (dev->addr_len) { 2223 case ETH_ALEN: 2224 memcpy(eui, dev->dev_addr, 3); 2225 eui[3] = 0xFF; 2226 eui[4] = 0xFE; 2227 memcpy(eui + 5, dev->dev_addr + 3, 3); 2228 break; 2229 case EUI64_ADDR_LEN: 2230 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2231 eui[0] ^= 2; 2232 break; 2233 default: 2234 return -1; 2235 } 2236 2237 return 0; 2238 } 2239 2240 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2241 { 2242 const union fwnet_hwaddr *ha; 2243 2244 if (dev->addr_len != FWNET_ALEN) 2245 return -1; 2246 2247 ha = (const union fwnet_hwaddr *)dev->dev_addr; 2248 2249 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2250 eui[0] ^= 2; 2251 return 0; 2252 } 2253 2254 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2255 { 2256 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2257 if (dev->addr_len != ARCNET_ALEN) 2258 return -1; 2259 memset(eui, 0, 7); 2260 eui[7] = *(u8 *)dev->dev_addr; 2261 return 0; 2262 } 2263 2264 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2265 { 2266 if (dev->addr_len != INFINIBAND_ALEN) 2267 return -1; 2268 memcpy(eui, dev->dev_addr + 12, 8); 2269 eui[0] |= 2; 2270 return 0; 2271 } 2272 2273 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2274 { 2275 if (addr == 0) 2276 return -1; 2277 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2278 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2279 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2280 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2281 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2282 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2283 eui[1] = 0; 2284 eui[2] = 0x5E; 2285 eui[3] = 0xFE; 2286 memcpy(eui + 4, &addr, 4); 2287 return 0; 2288 } 2289 2290 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2291 { 2292 if (dev->priv_flags & IFF_ISATAP) 2293 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2294 return -1; 2295 } 2296 2297 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2298 { 2299 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2300 } 2301 2302 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2303 { 2304 memcpy(eui, dev->perm_addr, 3); 2305 memcpy(eui + 5, dev->perm_addr + 3, 3); 2306 eui[3] = 0xFF; 2307 eui[4] = 0xFE; 2308 eui[0] ^= 2; 2309 return 0; 2310 } 2311 2312 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2313 { 2314 switch (dev->type) { 2315 case ARPHRD_ETHER: 2316 case ARPHRD_FDDI: 2317 return addrconf_ifid_eui48(eui, dev); 2318 case ARPHRD_ARCNET: 2319 return addrconf_ifid_arcnet(eui, dev); 2320 case ARPHRD_INFINIBAND: 2321 return addrconf_ifid_infiniband(eui, dev); 2322 case ARPHRD_SIT: 2323 return addrconf_ifid_sit(eui, dev); 2324 case ARPHRD_IPGRE: 2325 case ARPHRD_TUNNEL: 2326 return addrconf_ifid_gre(eui, dev); 2327 case ARPHRD_6LOWPAN: 2328 return addrconf_ifid_6lowpan(eui, dev); 2329 case ARPHRD_IEEE1394: 2330 return addrconf_ifid_ieee1394(eui, dev); 2331 case ARPHRD_TUNNEL6: 2332 case ARPHRD_IP6GRE: 2333 case ARPHRD_RAWIP: 2334 return addrconf_ifid_ip6tnl(eui, dev); 2335 } 2336 return -1; 2337 } 2338 2339 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2340 { 2341 int err = -1; 2342 struct inet6_ifaddr *ifp; 2343 2344 read_lock_bh(&idev->lock); 2345 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2346 if (ifp->scope > IFA_LINK) 2347 break; 2348 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2349 memcpy(eui, ifp->addr.s6_addr+8, 8); 2350 err = 0; 2351 break; 2352 } 2353 } 2354 read_unlock_bh(&idev->lock); 2355 return err; 2356 } 2357 2358 /* Generation of a randomized Interface Identifier 2359 * draft-ietf-6man-rfc4941bis, Section 3.3.1 2360 */ 2361 2362 static void ipv6_gen_rnd_iid(struct in6_addr *addr) 2363 { 2364 regen: 2365 get_random_bytes(&addr->s6_addr[8], 8); 2366 2367 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1: 2368 * check if generated address is not inappropriate: 2369 * 2370 * - Reserved IPv6 Interface Identifiers 2371 * - XXX: already assigned to an address on the device 2372 */ 2373 2374 /* Subnet-router anycast: 0000:0000:0000:0000 */ 2375 if (!(addr->s6_addr32[2] | addr->s6_addr32[3])) 2376 goto regen; 2377 2378 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212 2379 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213 2380 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF 2381 */ 2382 if (ntohl(addr->s6_addr32[2]) == 0x02005eff && 2383 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000) 2384 goto regen; 2385 2386 /* Reserved subnet anycast addresses */ 2387 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff && 2388 ntohl(addr->s6_addr32[3]) >= 0Xffffff80) 2389 goto regen; 2390 } 2391 2392 /* 2393 * Add prefix route. 2394 */ 2395 2396 static void 2397 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric, 2398 struct net_device *dev, unsigned long expires, 2399 u32 flags, gfp_t gfp_flags) 2400 { 2401 struct fib6_config cfg = { 2402 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2403 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF, 2404 .fc_ifindex = dev->ifindex, 2405 .fc_expires = expires, 2406 .fc_dst_len = plen, 2407 .fc_flags = RTF_UP | flags, 2408 .fc_nlinfo.nl_net = dev_net(dev), 2409 .fc_protocol = RTPROT_KERNEL, 2410 .fc_type = RTN_UNICAST, 2411 }; 2412 2413 cfg.fc_dst = *pfx; 2414 2415 /* Prevent useless cloning on PtP SIT. 2416 This thing is done here expecting that the whole 2417 class of non-broadcast devices need not cloning. 2418 */ 2419 #if IS_ENABLED(CONFIG_IPV6_SIT) 2420 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2421 cfg.fc_flags |= RTF_NONEXTHOP; 2422 #endif 2423 2424 ip6_route_add(&cfg, gfp_flags, NULL); 2425 } 2426 2427 2428 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2429 int plen, 2430 const struct net_device *dev, 2431 u32 flags, u32 noflags, 2432 bool no_gw) 2433 { 2434 struct fib6_node *fn; 2435 struct fib6_info *rt = NULL; 2436 struct fib6_table *table; 2437 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2438 2439 table = fib6_get_table(dev_net(dev), tb_id); 2440 if (!table) 2441 return NULL; 2442 2443 rcu_read_lock(); 2444 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true); 2445 if (!fn) 2446 goto out; 2447 2448 for_each_fib6_node_rt_rcu(fn) { 2449 /* prefix routes only use builtin fib6_nh */ 2450 if (rt->nh) 2451 continue; 2452 2453 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex) 2454 continue; 2455 if (no_gw && rt->fib6_nh->fib_nh_gw_family) 2456 continue; 2457 if ((rt->fib6_flags & flags) != flags) 2458 continue; 2459 if ((rt->fib6_flags & noflags) != 0) 2460 continue; 2461 if (!fib6_info_hold_safe(rt)) 2462 continue; 2463 break; 2464 } 2465 out: 2466 rcu_read_unlock(); 2467 return rt; 2468 } 2469 2470 2471 /* Create "default" multicast route to the interface */ 2472 2473 static void addrconf_add_mroute(struct net_device *dev) 2474 { 2475 struct fib6_config cfg = { 2476 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2477 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2478 .fc_ifindex = dev->ifindex, 2479 .fc_dst_len = 8, 2480 .fc_flags = RTF_UP, 2481 .fc_type = RTN_MULTICAST, 2482 .fc_nlinfo.nl_net = dev_net(dev), 2483 .fc_protocol = RTPROT_KERNEL, 2484 }; 2485 2486 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2487 2488 ip6_route_add(&cfg, GFP_KERNEL, NULL); 2489 } 2490 2491 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2492 { 2493 struct inet6_dev *idev; 2494 2495 ASSERT_RTNL(); 2496 2497 idev = ipv6_find_idev(dev); 2498 if (IS_ERR(idev)) 2499 return idev; 2500 2501 if (idev->cnf.disable_ipv6) 2502 return ERR_PTR(-EACCES); 2503 2504 /* Add default multicast route */ 2505 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2506 addrconf_add_mroute(dev); 2507 2508 return idev; 2509 } 2510 2511 static void manage_tempaddrs(struct inet6_dev *idev, 2512 struct inet6_ifaddr *ifp, 2513 __u32 valid_lft, __u32 prefered_lft, 2514 bool create, unsigned long now) 2515 { 2516 u32 flags; 2517 struct inet6_ifaddr *ift; 2518 2519 read_lock_bh(&idev->lock); 2520 /* update all temporary addresses in the list */ 2521 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2522 int age, max_valid, max_prefered; 2523 2524 if (ifp != ift->ifpub) 2525 continue; 2526 2527 /* RFC 4941 section 3.3: 2528 * If a received option will extend the lifetime of a public 2529 * address, the lifetimes of temporary addresses should 2530 * be extended, subject to the overall constraint that no 2531 * temporary addresses should ever remain "valid" or "preferred" 2532 * for a time longer than (TEMP_VALID_LIFETIME) or 2533 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2534 */ 2535 age = (now - ift->cstamp) / HZ; 2536 max_valid = idev->cnf.temp_valid_lft - age; 2537 if (max_valid < 0) 2538 max_valid = 0; 2539 2540 max_prefered = idev->cnf.temp_prefered_lft - 2541 idev->desync_factor - age; 2542 if (max_prefered < 0) 2543 max_prefered = 0; 2544 2545 if (valid_lft > max_valid) 2546 valid_lft = max_valid; 2547 2548 if (prefered_lft > max_prefered) 2549 prefered_lft = max_prefered; 2550 2551 spin_lock(&ift->lock); 2552 flags = ift->flags; 2553 ift->valid_lft = valid_lft; 2554 ift->prefered_lft = prefered_lft; 2555 ift->tstamp = now; 2556 if (prefered_lft > 0) 2557 ift->flags &= ~IFA_F_DEPRECATED; 2558 2559 spin_unlock(&ift->lock); 2560 if (!(flags&IFA_F_TENTATIVE)) 2561 ipv6_ifa_notify(0, ift); 2562 } 2563 2564 if ((create || list_empty(&idev->tempaddr_list)) && 2565 idev->cnf.use_tempaddr > 0) { 2566 /* When a new public address is created as described 2567 * in [ADDRCONF], also create a new temporary address. 2568 * Also create a temporary address if it's enabled but 2569 * no temporary address currently exists. 2570 */ 2571 read_unlock_bh(&idev->lock); 2572 ipv6_create_tempaddr(ifp, false); 2573 } else { 2574 read_unlock_bh(&idev->lock); 2575 } 2576 } 2577 2578 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2579 { 2580 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2581 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2582 } 2583 2584 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2585 const struct prefix_info *pinfo, 2586 struct inet6_dev *in6_dev, 2587 const struct in6_addr *addr, int addr_type, 2588 u32 addr_flags, bool sllao, bool tokenized, 2589 __u32 valid_lft, u32 prefered_lft) 2590 { 2591 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2592 int create = 0; 2593 2594 if (!ifp && valid_lft) { 2595 int max_addresses = in6_dev->cnf.max_addresses; 2596 struct ifa6_config cfg = { 2597 .pfx = addr, 2598 .plen = pinfo->prefix_len, 2599 .ifa_flags = addr_flags, 2600 .valid_lft = valid_lft, 2601 .preferred_lft = prefered_lft, 2602 .scope = addr_type & IPV6_ADDR_SCOPE_MASK, 2603 }; 2604 2605 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2606 if ((net->ipv6.devconf_all->optimistic_dad || 2607 in6_dev->cnf.optimistic_dad) && 2608 !net->ipv6.devconf_all->forwarding && sllao) 2609 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 2610 #endif 2611 2612 /* Do not allow to create too much of autoconfigured 2613 * addresses; this would be too easy way to crash kernel. 2614 */ 2615 if (!max_addresses || 2616 ipv6_count_addresses(in6_dev) < max_addresses) 2617 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL); 2618 2619 if (IS_ERR_OR_NULL(ifp)) 2620 return -1; 2621 2622 create = 1; 2623 spin_lock_bh(&ifp->lock); 2624 ifp->flags |= IFA_F_MANAGETEMPADDR; 2625 ifp->cstamp = jiffies; 2626 ifp->tokenized = tokenized; 2627 spin_unlock_bh(&ifp->lock); 2628 addrconf_dad_start(ifp); 2629 } 2630 2631 if (ifp) { 2632 u32 flags; 2633 unsigned long now; 2634 u32 stored_lft; 2635 2636 /* Update lifetime (RFC4862 5.5.3 e) 2637 * We deviate from RFC4862 by honoring all Valid Lifetimes to 2638 * improve the reaction of SLAAC to renumbering events 2639 * (draft-gont-6man-slaac-renum-06, Section 4.2) 2640 */ 2641 spin_lock_bh(&ifp->lock); 2642 now = jiffies; 2643 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2644 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2645 else 2646 stored_lft = 0; 2647 2648 if (!create && stored_lft) { 2649 ifp->valid_lft = valid_lft; 2650 ifp->prefered_lft = prefered_lft; 2651 ifp->tstamp = now; 2652 flags = ifp->flags; 2653 ifp->flags &= ~IFA_F_DEPRECATED; 2654 spin_unlock_bh(&ifp->lock); 2655 2656 if (!(flags&IFA_F_TENTATIVE)) 2657 ipv6_ifa_notify(0, ifp); 2658 } else 2659 spin_unlock_bh(&ifp->lock); 2660 2661 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2662 create, now); 2663 2664 in6_ifa_put(ifp); 2665 addrconf_verify(); 2666 } 2667 2668 return 0; 2669 } 2670 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2671 2672 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2673 { 2674 struct prefix_info *pinfo; 2675 __u32 valid_lft; 2676 __u32 prefered_lft; 2677 int addr_type, err; 2678 u32 addr_flags = 0; 2679 struct inet6_dev *in6_dev; 2680 struct net *net = dev_net(dev); 2681 2682 pinfo = (struct prefix_info *) opt; 2683 2684 if (len < sizeof(struct prefix_info)) { 2685 netdev_dbg(dev, "addrconf: prefix option too short\n"); 2686 return; 2687 } 2688 2689 /* 2690 * Validation checks ([ADDRCONF], page 19) 2691 */ 2692 2693 addr_type = ipv6_addr_type(&pinfo->prefix); 2694 2695 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2696 return; 2697 2698 valid_lft = ntohl(pinfo->valid); 2699 prefered_lft = ntohl(pinfo->prefered); 2700 2701 if (prefered_lft > valid_lft) { 2702 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2703 return; 2704 } 2705 2706 in6_dev = in6_dev_get(dev); 2707 2708 if (!in6_dev) { 2709 net_dbg_ratelimited("addrconf: device %s not configured\n", 2710 dev->name); 2711 return; 2712 } 2713 2714 /* 2715 * Two things going on here: 2716 * 1) Add routes for on-link prefixes 2717 * 2) Configure prefixes with the auto flag set 2718 */ 2719 2720 if (pinfo->onlink) { 2721 struct fib6_info *rt; 2722 unsigned long rt_expires; 2723 2724 /* Avoid arithmetic overflow. Really, we could 2725 * save rt_expires in seconds, likely valid_lft, 2726 * but it would require division in fib gc, that it 2727 * not good. 2728 */ 2729 if (HZ > USER_HZ) 2730 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2731 else 2732 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2733 2734 if (addrconf_finite_timeout(rt_expires)) 2735 rt_expires *= HZ; 2736 2737 rt = addrconf_get_prefix_route(&pinfo->prefix, 2738 pinfo->prefix_len, 2739 dev, 2740 RTF_ADDRCONF | RTF_PREFIX_RT, 2741 RTF_DEFAULT, true); 2742 2743 if (rt) { 2744 /* Autoconf prefix route */ 2745 if (valid_lft == 0) { 2746 ip6_del_rt(net, rt, false); 2747 rt = NULL; 2748 } else if (addrconf_finite_timeout(rt_expires)) { 2749 /* not infinity */ 2750 fib6_set_expires(rt, jiffies + rt_expires); 2751 } else { 2752 fib6_clean_expires(rt); 2753 } 2754 } else if (valid_lft) { 2755 clock_t expires = 0; 2756 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2757 if (addrconf_finite_timeout(rt_expires)) { 2758 /* not infinity */ 2759 flags |= RTF_EXPIRES; 2760 expires = jiffies_to_clock_t(rt_expires); 2761 } 2762 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2763 0, dev, expires, flags, 2764 GFP_ATOMIC); 2765 } 2766 fib6_info_release(rt); 2767 } 2768 2769 /* Try to figure out our local address for this prefix */ 2770 2771 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2772 struct in6_addr addr; 2773 bool tokenized = false, dev_addr_generated = false; 2774 2775 if (pinfo->prefix_len == 64) { 2776 memcpy(&addr, &pinfo->prefix, 8); 2777 2778 if (!ipv6_addr_any(&in6_dev->token)) { 2779 read_lock_bh(&in6_dev->lock); 2780 memcpy(addr.s6_addr + 8, 2781 in6_dev->token.s6_addr + 8, 8); 2782 read_unlock_bh(&in6_dev->lock); 2783 tokenized = true; 2784 } else if (is_addr_mode_generate_stable(in6_dev) && 2785 !ipv6_generate_stable_address(&addr, 0, 2786 in6_dev)) { 2787 addr_flags |= IFA_F_STABLE_PRIVACY; 2788 goto ok; 2789 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2790 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2791 goto put; 2792 } else { 2793 dev_addr_generated = true; 2794 } 2795 goto ok; 2796 } 2797 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2798 pinfo->prefix_len); 2799 goto put; 2800 2801 ok: 2802 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2803 &addr, addr_type, 2804 addr_flags, sllao, 2805 tokenized, valid_lft, 2806 prefered_lft); 2807 if (err) 2808 goto put; 2809 2810 /* Ignore error case here because previous prefix add addr was 2811 * successful which will be notified. 2812 */ 2813 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2814 addr_type, addr_flags, sllao, 2815 tokenized, valid_lft, 2816 prefered_lft, 2817 dev_addr_generated); 2818 } 2819 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2820 put: 2821 in6_dev_put(in6_dev); 2822 } 2823 2824 static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev, 2825 struct in6_ifreq *ireq) 2826 { 2827 struct ip_tunnel_parm p = { }; 2828 int err; 2829 2830 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4)) 2831 return -EADDRNOTAVAIL; 2832 2833 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3]; 2834 p.iph.version = 4; 2835 p.iph.ihl = 5; 2836 p.iph.protocol = IPPROTO_IPV6; 2837 p.iph.ttl = 64; 2838 2839 if (!dev->netdev_ops->ndo_tunnel_ctl) 2840 return -EOPNOTSUPP; 2841 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL); 2842 if (err) 2843 return err; 2844 2845 dev = __dev_get_by_name(net, p.name); 2846 if (!dev) 2847 return -ENOBUFS; 2848 return dev_open(dev, NULL); 2849 } 2850 2851 /* 2852 * Set destination address. 2853 * Special case for SIT interfaces where we create a new "virtual" 2854 * device. 2855 */ 2856 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2857 { 2858 struct net_device *dev; 2859 struct in6_ifreq ireq; 2860 int err = -ENODEV; 2861 2862 if (!IS_ENABLED(CONFIG_IPV6_SIT)) 2863 return -ENODEV; 2864 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2865 return -EFAULT; 2866 2867 rtnl_lock(); 2868 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2869 if (dev && dev->type == ARPHRD_SIT) 2870 err = addrconf_set_sit_dstaddr(net, dev, &ireq); 2871 rtnl_unlock(); 2872 return err; 2873 } 2874 2875 static int ipv6_mc_config(struct sock *sk, bool join, 2876 const struct in6_addr *addr, int ifindex) 2877 { 2878 int ret; 2879 2880 ASSERT_RTNL(); 2881 2882 lock_sock(sk); 2883 if (join) 2884 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2885 else 2886 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2887 release_sock(sk); 2888 2889 return ret; 2890 } 2891 2892 /* 2893 * Manual configuration of address on an interface 2894 */ 2895 static int inet6_addr_add(struct net *net, int ifindex, 2896 struct ifa6_config *cfg, 2897 struct netlink_ext_ack *extack) 2898 { 2899 struct inet6_ifaddr *ifp; 2900 struct inet6_dev *idev; 2901 struct net_device *dev; 2902 unsigned long timeout; 2903 clock_t expires; 2904 u32 flags; 2905 2906 ASSERT_RTNL(); 2907 2908 if (cfg->plen > 128) 2909 return -EINVAL; 2910 2911 /* check the lifetime */ 2912 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 2913 return -EINVAL; 2914 2915 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) 2916 return -EINVAL; 2917 2918 dev = __dev_get_by_index(net, ifindex); 2919 if (!dev) 2920 return -ENODEV; 2921 2922 idev = addrconf_add_dev(dev); 2923 if (IS_ERR(idev)) 2924 return PTR_ERR(idev); 2925 2926 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2927 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2928 true, cfg->pfx, ifindex); 2929 2930 if (ret < 0) 2931 return ret; 2932 } 2933 2934 cfg->scope = ipv6_addr_scope(cfg->pfx); 2935 2936 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 2937 if (addrconf_finite_timeout(timeout)) { 2938 expires = jiffies_to_clock_t(timeout * HZ); 2939 cfg->valid_lft = timeout; 2940 flags = RTF_EXPIRES; 2941 } else { 2942 expires = 0; 2943 flags = 0; 2944 cfg->ifa_flags |= IFA_F_PERMANENT; 2945 } 2946 2947 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 2948 if (addrconf_finite_timeout(timeout)) { 2949 if (timeout == 0) 2950 cfg->ifa_flags |= IFA_F_DEPRECATED; 2951 cfg->preferred_lft = timeout; 2952 } 2953 2954 ifp = ipv6_add_addr(idev, cfg, true, extack); 2955 if (!IS_ERR(ifp)) { 2956 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 2957 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 2958 ifp->rt_priority, dev, expires, 2959 flags, GFP_KERNEL); 2960 } 2961 2962 /* Send a netlink notification if DAD is enabled and 2963 * optimistic flag is not set 2964 */ 2965 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD))) 2966 ipv6_ifa_notify(0, ifp); 2967 /* 2968 * Note that section 3.1 of RFC 4429 indicates 2969 * that the Optimistic flag should not be set for 2970 * manually configured addresses 2971 */ 2972 addrconf_dad_start(ifp); 2973 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR) 2974 manage_tempaddrs(idev, ifp, cfg->valid_lft, 2975 cfg->preferred_lft, true, jiffies); 2976 in6_ifa_put(ifp); 2977 addrconf_verify_rtnl(); 2978 return 0; 2979 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2980 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false, 2981 cfg->pfx, ifindex); 2982 } 2983 2984 return PTR_ERR(ifp); 2985 } 2986 2987 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2988 const struct in6_addr *pfx, unsigned int plen) 2989 { 2990 struct inet6_ifaddr *ifp; 2991 struct inet6_dev *idev; 2992 struct net_device *dev; 2993 2994 if (plen > 128) 2995 return -EINVAL; 2996 2997 dev = __dev_get_by_index(net, ifindex); 2998 if (!dev) 2999 return -ENODEV; 3000 3001 idev = __in6_dev_get(dev); 3002 if (!idev) 3003 return -ENXIO; 3004 3005 read_lock_bh(&idev->lock); 3006 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3007 if (ifp->prefix_len == plen && 3008 ipv6_addr_equal(pfx, &ifp->addr)) { 3009 in6_ifa_hold(ifp); 3010 read_unlock_bh(&idev->lock); 3011 3012 if (!(ifp->flags & IFA_F_TEMPORARY) && 3013 (ifa_flags & IFA_F_MANAGETEMPADDR)) 3014 manage_tempaddrs(idev, ifp, 0, 0, false, 3015 jiffies); 3016 ipv6_del_addr(ifp); 3017 addrconf_verify_rtnl(); 3018 if (ipv6_addr_is_multicast(pfx)) { 3019 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 3020 false, pfx, dev->ifindex); 3021 } 3022 return 0; 3023 } 3024 } 3025 read_unlock_bh(&idev->lock); 3026 return -EADDRNOTAVAIL; 3027 } 3028 3029 3030 int addrconf_add_ifaddr(struct net *net, void __user *arg) 3031 { 3032 struct ifa6_config cfg = { 3033 .ifa_flags = IFA_F_PERMANENT, 3034 .preferred_lft = INFINITY_LIFE_TIME, 3035 .valid_lft = INFINITY_LIFE_TIME, 3036 }; 3037 struct in6_ifreq ireq; 3038 int err; 3039 3040 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3041 return -EPERM; 3042 3043 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3044 return -EFAULT; 3045 3046 cfg.pfx = &ireq.ifr6_addr; 3047 cfg.plen = ireq.ifr6_prefixlen; 3048 3049 rtnl_lock(); 3050 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL); 3051 rtnl_unlock(); 3052 return err; 3053 } 3054 3055 int addrconf_del_ifaddr(struct net *net, void __user *arg) 3056 { 3057 struct in6_ifreq ireq; 3058 int err; 3059 3060 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3061 return -EPERM; 3062 3063 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3064 return -EFAULT; 3065 3066 rtnl_lock(); 3067 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 3068 ireq.ifr6_prefixlen); 3069 rtnl_unlock(); 3070 return err; 3071 } 3072 3073 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 3074 int plen, int scope) 3075 { 3076 struct inet6_ifaddr *ifp; 3077 struct ifa6_config cfg = { 3078 .pfx = addr, 3079 .plen = plen, 3080 .ifa_flags = IFA_F_PERMANENT, 3081 .valid_lft = INFINITY_LIFE_TIME, 3082 .preferred_lft = INFINITY_LIFE_TIME, 3083 .scope = scope 3084 }; 3085 3086 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3087 if (!IS_ERR(ifp)) { 3088 spin_lock_bh(&ifp->lock); 3089 ifp->flags &= ~IFA_F_TENTATIVE; 3090 spin_unlock_bh(&ifp->lock); 3091 rt_genid_bump_ipv6(dev_net(idev->dev)); 3092 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3093 in6_ifa_put(ifp); 3094 } 3095 } 3096 3097 #if IS_ENABLED(CONFIG_IPV6_SIT) || IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3098 static void add_v4_addrs(struct inet6_dev *idev) 3099 { 3100 struct in6_addr addr; 3101 struct net_device *dev; 3102 struct net *net = dev_net(idev->dev); 3103 int scope, plen, offset = 0; 3104 u32 pflags = 0; 3105 3106 ASSERT_RTNL(); 3107 3108 memset(&addr, 0, sizeof(struct in6_addr)); 3109 /* in case of IP6GRE the dev_addr is an IPv6 and therefore we use only the last 4 bytes */ 3110 if (idev->dev->addr_len == sizeof(struct in6_addr)) 3111 offset = sizeof(struct in6_addr) - 4; 3112 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr + offset, 4); 3113 3114 if (idev->dev->flags&IFF_POINTOPOINT) { 3115 if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE) 3116 return; 3117 3118 addr.s6_addr32[0] = htonl(0xfe800000); 3119 scope = IFA_LINK; 3120 plen = 64; 3121 } else { 3122 scope = IPV6_ADDR_COMPATv4; 3123 plen = 96; 3124 pflags |= RTF_NONEXTHOP; 3125 } 3126 3127 if (addr.s6_addr32[3]) { 3128 add_addr(idev, &addr, plen, scope); 3129 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags, 3130 GFP_KERNEL); 3131 return; 3132 } 3133 3134 for_each_netdev(net, dev) { 3135 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3136 if (in_dev && (dev->flags & IFF_UP)) { 3137 struct in_ifaddr *ifa; 3138 int flag = scope; 3139 3140 in_dev_for_each_ifa_rtnl(ifa, in_dev) { 3141 addr.s6_addr32[3] = ifa->ifa_local; 3142 3143 if (ifa->ifa_scope == RT_SCOPE_LINK) 3144 continue; 3145 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3146 if (idev->dev->flags&IFF_POINTOPOINT) 3147 continue; 3148 flag |= IFA_HOST; 3149 } 3150 3151 add_addr(idev, &addr, plen, flag); 3152 addrconf_prefix_route(&addr, plen, 0, idev->dev, 3153 0, pflags, GFP_KERNEL); 3154 } 3155 } 3156 } 3157 } 3158 #endif 3159 3160 static void init_loopback(struct net_device *dev) 3161 { 3162 struct inet6_dev *idev; 3163 3164 /* ::1 */ 3165 3166 ASSERT_RTNL(); 3167 3168 idev = ipv6_find_idev(dev); 3169 if (IS_ERR(idev)) { 3170 pr_debug("%s: add_dev failed\n", __func__); 3171 return; 3172 } 3173 3174 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 3175 } 3176 3177 void addrconf_add_linklocal(struct inet6_dev *idev, 3178 const struct in6_addr *addr, u32 flags) 3179 { 3180 struct ifa6_config cfg = { 3181 .pfx = addr, 3182 .plen = 64, 3183 .ifa_flags = flags | IFA_F_PERMANENT, 3184 .valid_lft = INFINITY_LIFE_TIME, 3185 .preferred_lft = INFINITY_LIFE_TIME, 3186 .scope = IFA_LINK 3187 }; 3188 struct inet6_ifaddr *ifp; 3189 3190 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3191 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad || 3192 idev->cnf.optimistic_dad) && 3193 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3194 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 3195 #endif 3196 3197 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3198 if (!IS_ERR(ifp)) { 3199 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev, 3200 0, 0, GFP_ATOMIC); 3201 addrconf_dad_start(ifp); 3202 in6_ifa_put(ifp); 3203 } 3204 } 3205 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3206 3207 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3208 { 3209 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3210 return true; 3211 3212 if (address.s6_addr32[2] == htonl(0x02005eff) && 3213 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3214 return true; 3215 3216 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3217 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3218 return true; 3219 3220 return false; 3221 } 3222 3223 static int ipv6_generate_stable_address(struct in6_addr *address, 3224 u8 dad_count, 3225 const struct inet6_dev *idev) 3226 { 3227 static DEFINE_SPINLOCK(lock); 3228 static __u32 digest[SHA1_DIGEST_WORDS]; 3229 static __u32 workspace[SHA1_WORKSPACE_WORDS]; 3230 3231 static union { 3232 char __data[SHA1_BLOCK_SIZE]; 3233 struct { 3234 struct in6_addr secret; 3235 __be32 prefix[2]; 3236 unsigned char hwaddr[MAX_ADDR_LEN]; 3237 u8 dad_count; 3238 } __packed; 3239 } data; 3240 3241 struct in6_addr secret; 3242 struct in6_addr temp; 3243 struct net *net = dev_net(idev->dev); 3244 3245 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3246 3247 if (idev->cnf.stable_secret.initialized) 3248 secret = idev->cnf.stable_secret.secret; 3249 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3250 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3251 else 3252 return -1; 3253 3254 retry: 3255 spin_lock_bh(&lock); 3256 3257 sha1_init(digest); 3258 memset(&data, 0, sizeof(data)); 3259 memset(workspace, 0, sizeof(workspace)); 3260 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3261 data.prefix[0] = address->s6_addr32[0]; 3262 data.prefix[1] = address->s6_addr32[1]; 3263 data.secret = secret; 3264 data.dad_count = dad_count; 3265 3266 sha1_transform(digest, data.__data, workspace); 3267 3268 temp = *address; 3269 temp.s6_addr32[2] = (__force __be32)digest[0]; 3270 temp.s6_addr32[3] = (__force __be32)digest[1]; 3271 3272 spin_unlock_bh(&lock); 3273 3274 if (ipv6_reserved_interfaceid(temp)) { 3275 dad_count++; 3276 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3277 return -1; 3278 goto retry; 3279 } 3280 3281 *address = temp; 3282 return 0; 3283 } 3284 3285 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3286 { 3287 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3288 3289 if (s->initialized) 3290 return; 3291 s = &idev->cnf.stable_secret; 3292 get_random_bytes(&s->secret, sizeof(s->secret)); 3293 s->initialized = true; 3294 } 3295 3296 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3297 { 3298 struct in6_addr addr; 3299 3300 /* no link local addresses on L3 master devices */ 3301 if (netif_is_l3_master(idev->dev)) 3302 return; 3303 3304 /* no link local addresses on devices flagged as slaves */ 3305 if (idev->dev->flags & IFF_SLAVE) 3306 return; 3307 3308 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3309 3310 switch (idev->cnf.addr_gen_mode) { 3311 case IN6_ADDR_GEN_MODE_RANDOM: 3312 ipv6_gen_mode_random_init(idev); 3313 fallthrough; 3314 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3315 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3316 addrconf_add_linklocal(idev, &addr, 3317 IFA_F_STABLE_PRIVACY); 3318 else if (prefix_route) 3319 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3320 0, 0, GFP_KERNEL); 3321 break; 3322 case IN6_ADDR_GEN_MODE_EUI64: 3323 /* addrconf_add_linklocal also adds a prefix_route and we 3324 * only need to care about prefix routes if ipv6_generate_eui64 3325 * couldn't generate one. 3326 */ 3327 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3328 addrconf_add_linklocal(idev, &addr, 0); 3329 else if (prefix_route) 3330 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3331 0, 0, GFP_KERNEL); 3332 break; 3333 case IN6_ADDR_GEN_MODE_NONE: 3334 default: 3335 /* will not add any link local address */ 3336 break; 3337 } 3338 } 3339 3340 static void addrconf_dev_config(struct net_device *dev) 3341 { 3342 struct inet6_dev *idev; 3343 3344 ASSERT_RTNL(); 3345 3346 if ((dev->type != ARPHRD_ETHER) && 3347 (dev->type != ARPHRD_FDDI) && 3348 (dev->type != ARPHRD_ARCNET) && 3349 (dev->type != ARPHRD_INFINIBAND) && 3350 (dev->type != ARPHRD_IEEE1394) && 3351 (dev->type != ARPHRD_TUNNEL6) && 3352 (dev->type != ARPHRD_6LOWPAN) && 3353 (dev->type != ARPHRD_TUNNEL) && 3354 (dev->type != ARPHRD_NONE) && 3355 (dev->type != ARPHRD_RAWIP)) { 3356 /* Alas, we support only Ethernet autoconfiguration. */ 3357 idev = __in6_dev_get(dev); 3358 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP && 3359 dev->flags & IFF_MULTICAST) 3360 ipv6_mc_up(idev); 3361 return; 3362 } 3363 3364 idev = addrconf_add_dev(dev); 3365 if (IS_ERR(idev)) 3366 return; 3367 3368 /* this device type has no EUI support */ 3369 if (dev->type == ARPHRD_NONE && 3370 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3371 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3372 3373 addrconf_addr_gen(idev, false); 3374 } 3375 3376 #if IS_ENABLED(CONFIG_IPV6_SIT) 3377 static void addrconf_sit_config(struct net_device *dev) 3378 { 3379 struct inet6_dev *idev; 3380 3381 ASSERT_RTNL(); 3382 3383 /* 3384 * Configure the tunnel with one of our IPv4 3385 * addresses... we should configure all of 3386 * our v4 addrs in the tunnel 3387 */ 3388 3389 idev = ipv6_find_idev(dev); 3390 if (IS_ERR(idev)) { 3391 pr_debug("%s: add_dev failed\n", __func__); 3392 return; 3393 } 3394 3395 if (dev->priv_flags & IFF_ISATAP) { 3396 addrconf_addr_gen(idev, false); 3397 return; 3398 } 3399 3400 add_v4_addrs(idev); 3401 3402 if (dev->flags&IFF_POINTOPOINT) 3403 addrconf_add_mroute(dev); 3404 } 3405 #endif 3406 3407 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3408 static void addrconf_gre_config(struct net_device *dev) 3409 { 3410 struct inet6_dev *idev; 3411 3412 ASSERT_RTNL(); 3413 3414 idev = ipv6_find_idev(dev); 3415 if (IS_ERR(idev)) { 3416 pr_debug("%s: add_dev failed\n", __func__); 3417 return; 3418 } 3419 3420 if (dev->type == ARPHRD_ETHER) { 3421 addrconf_addr_gen(idev, true); 3422 return; 3423 } 3424 3425 add_v4_addrs(idev); 3426 3427 if (dev->flags & IFF_POINTOPOINT) 3428 addrconf_add_mroute(dev); 3429 } 3430 #endif 3431 3432 static int fixup_permanent_addr(struct net *net, 3433 struct inet6_dev *idev, 3434 struct inet6_ifaddr *ifp) 3435 { 3436 /* !fib6_node means the host route was removed from the 3437 * FIB, for example, if 'lo' device is taken down. In that 3438 * case regenerate the host route. 3439 */ 3440 if (!ifp->rt || !ifp->rt->fib6_node) { 3441 struct fib6_info *f6i, *prev; 3442 3443 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false, 3444 GFP_ATOMIC); 3445 if (IS_ERR(f6i)) 3446 return PTR_ERR(f6i); 3447 3448 /* ifp->rt can be accessed outside of rtnl */ 3449 spin_lock(&ifp->lock); 3450 prev = ifp->rt; 3451 ifp->rt = f6i; 3452 spin_unlock(&ifp->lock); 3453 3454 fib6_info_release(prev); 3455 } 3456 3457 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3458 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3459 ifp->rt_priority, idev->dev, 0, 0, 3460 GFP_ATOMIC); 3461 } 3462 3463 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3464 addrconf_dad_start(ifp); 3465 3466 return 0; 3467 } 3468 3469 static void addrconf_permanent_addr(struct net *net, struct net_device *dev) 3470 { 3471 struct inet6_ifaddr *ifp, *tmp; 3472 struct inet6_dev *idev; 3473 3474 idev = __in6_dev_get(dev); 3475 if (!idev) 3476 return; 3477 3478 write_lock_bh(&idev->lock); 3479 3480 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3481 if ((ifp->flags & IFA_F_PERMANENT) && 3482 fixup_permanent_addr(net, idev, ifp) < 0) { 3483 write_unlock_bh(&idev->lock); 3484 in6_ifa_hold(ifp); 3485 ipv6_del_addr(ifp); 3486 write_lock_bh(&idev->lock); 3487 3488 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3489 idev->dev->name, &ifp->addr); 3490 } 3491 } 3492 3493 write_unlock_bh(&idev->lock); 3494 } 3495 3496 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3497 void *ptr) 3498 { 3499 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3500 struct netdev_notifier_change_info *change_info; 3501 struct netdev_notifier_changeupper_info *info; 3502 struct inet6_dev *idev = __in6_dev_get(dev); 3503 struct net *net = dev_net(dev); 3504 int run_pending = 0; 3505 int err; 3506 3507 switch (event) { 3508 case NETDEV_REGISTER: 3509 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3510 idev = ipv6_add_dev(dev); 3511 if (IS_ERR(idev)) 3512 return notifier_from_errno(PTR_ERR(idev)); 3513 } 3514 break; 3515 3516 case NETDEV_CHANGEMTU: 3517 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3518 if (dev->mtu < IPV6_MIN_MTU) { 3519 addrconf_ifdown(dev, dev != net->loopback_dev); 3520 break; 3521 } 3522 3523 if (idev) { 3524 rt6_mtu_change(dev, dev->mtu); 3525 idev->cnf.mtu6 = dev->mtu; 3526 break; 3527 } 3528 3529 /* allocate new idev */ 3530 idev = ipv6_add_dev(dev); 3531 if (IS_ERR(idev)) 3532 break; 3533 3534 /* device is still not ready */ 3535 if (!(idev->if_flags & IF_READY)) 3536 break; 3537 3538 run_pending = 1; 3539 fallthrough; 3540 case NETDEV_UP: 3541 case NETDEV_CHANGE: 3542 if (dev->flags & IFF_SLAVE) 3543 break; 3544 3545 if (idev && idev->cnf.disable_ipv6) 3546 break; 3547 3548 if (event == NETDEV_UP) { 3549 /* restore routes for permanent addresses */ 3550 addrconf_permanent_addr(net, dev); 3551 3552 if (!addrconf_link_ready(dev)) { 3553 /* device is not ready yet. */ 3554 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3555 dev->name); 3556 break; 3557 } 3558 3559 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3560 idev = ipv6_add_dev(dev); 3561 3562 if (!IS_ERR_OR_NULL(idev)) { 3563 idev->if_flags |= IF_READY; 3564 run_pending = 1; 3565 } 3566 } else if (event == NETDEV_CHANGE) { 3567 if (!addrconf_link_ready(dev)) { 3568 /* device is still not ready. */ 3569 rt6_sync_down_dev(dev, event); 3570 break; 3571 } 3572 3573 if (!IS_ERR_OR_NULL(idev)) { 3574 if (idev->if_flags & IF_READY) { 3575 /* device is already configured - 3576 * but resend MLD reports, we might 3577 * have roamed and need to update 3578 * multicast snooping switches 3579 */ 3580 ipv6_mc_up(idev); 3581 change_info = ptr; 3582 if (change_info->flags_changed & IFF_NOARP) 3583 addrconf_dad_run(idev, true); 3584 rt6_sync_up(dev, RTNH_F_LINKDOWN); 3585 break; 3586 } 3587 idev->if_flags |= IF_READY; 3588 } 3589 3590 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3591 dev->name); 3592 3593 run_pending = 1; 3594 } 3595 3596 switch (dev->type) { 3597 #if IS_ENABLED(CONFIG_IPV6_SIT) 3598 case ARPHRD_SIT: 3599 addrconf_sit_config(dev); 3600 break; 3601 #endif 3602 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3603 case ARPHRD_IP6GRE: 3604 case ARPHRD_IPGRE: 3605 addrconf_gre_config(dev); 3606 break; 3607 #endif 3608 case ARPHRD_LOOPBACK: 3609 init_loopback(dev); 3610 break; 3611 3612 default: 3613 addrconf_dev_config(dev); 3614 break; 3615 } 3616 3617 if (!IS_ERR_OR_NULL(idev)) { 3618 if (run_pending) 3619 addrconf_dad_run(idev, false); 3620 3621 /* Device has an address by now */ 3622 rt6_sync_up(dev, RTNH_F_DEAD); 3623 3624 /* 3625 * If the MTU changed during the interface down, 3626 * when the interface up, the changed MTU must be 3627 * reflected in the idev as well as routers. 3628 */ 3629 if (idev->cnf.mtu6 != dev->mtu && 3630 dev->mtu >= IPV6_MIN_MTU) { 3631 rt6_mtu_change(dev, dev->mtu); 3632 idev->cnf.mtu6 = dev->mtu; 3633 } 3634 idev->tstamp = jiffies; 3635 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3636 3637 /* 3638 * If the changed mtu during down is lower than 3639 * IPV6_MIN_MTU stop IPv6 on this interface. 3640 */ 3641 if (dev->mtu < IPV6_MIN_MTU) 3642 addrconf_ifdown(dev, dev != net->loopback_dev); 3643 } 3644 break; 3645 3646 case NETDEV_DOWN: 3647 case NETDEV_UNREGISTER: 3648 /* 3649 * Remove all addresses from this interface. 3650 */ 3651 addrconf_ifdown(dev, event != NETDEV_DOWN); 3652 break; 3653 3654 case NETDEV_CHANGENAME: 3655 if (idev) { 3656 snmp6_unregister_dev(idev); 3657 addrconf_sysctl_unregister(idev); 3658 err = addrconf_sysctl_register(idev); 3659 if (err) 3660 return notifier_from_errno(err); 3661 err = snmp6_register_dev(idev); 3662 if (err) { 3663 addrconf_sysctl_unregister(idev); 3664 return notifier_from_errno(err); 3665 } 3666 } 3667 break; 3668 3669 case NETDEV_PRE_TYPE_CHANGE: 3670 case NETDEV_POST_TYPE_CHANGE: 3671 if (idev) 3672 addrconf_type_change(dev, event); 3673 break; 3674 3675 case NETDEV_CHANGEUPPER: 3676 info = ptr; 3677 3678 /* flush all routes if dev is linked to or unlinked from 3679 * an L3 master device (e.g., VRF) 3680 */ 3681 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3682 addrconf_ifdown(dev, false); 3683 } 3684 3685 return NOTIFY_OK; 3686 } 3687 3688 /* 3689 * addrconf module should be notified of a device going up 3690 */ 3691 static struct notifier_block ipv6_dev_notf = { 3692 .notifier_call = addrconf_notify, 3693 .priority = ADDRCONF_NOTIFY_PRIORITY, 3694 }; 3695 3696 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3697 { 3698 struct inet6_dev *idev; 3699 ASSERT_RTNL(); 3700 3701 idev = __in6_dev_get(dev); 3702 3703 if (event == NETDEV_POST_TYPE_CHANGE) 3704 ipv6_mc_remap(idev); 3705 else if (event == NETDEV_PRE_TYPE_CHANGE) 3706 ipv6_mc_unmap(idev); 3707 } 3708 3709 static bool addr_is_local(const struct in6_addr *addr) 3710 { 3711 return ipv6_addr_type(addr) & 3712 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3713 } 3714 3715 static int addrconf_ifdown(struct net_device *dev, bool unregister) 3716 { 3717 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN; 3718 struct net *net = dev_net(dev); 3719 struct inet6_dev *idev; 3720 struct inet6_ifaddr *ifa, *tmp; 3721 bool keep_addr = false; 3722 int state, i; 3723 3724 ASSERT_RTNL(); 3725 3726 rt6_disable_ip(dev, event); 3727 3728 idev = __in6_dev_get(dev); 3729 if (!idev) 3730 return -ENODEV; 3731 3732 /* 3733 * Step 1: remove reference to ipv6 device from parent device. 3734 * Do not dev_put! 3735 */ 3736 if (unregister) { 3737 idev->dead = 1; 3738 3739 /* protected by rtnl_lock */ 3740 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3741 3742 /* Step 1.5: remove snmp6 entry */ 3743 snmp6_unregister_dev(idev); 3744 3745 } 3746 3747 /* combine the user config with event to determine if permanent 3748 * addresses are to be removed from address hash table 3749 */ 3750 if (!unregister && !idev->cnf.disable_ipv6) { 3751 /* aggregate the system setting and interface setting */ 3752 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3753 3754 if (!_keep_addr) 3755 _keep_addr = idev->cnf.keep_addr_on_down; 3756 3757 keep_addr = (_keep_addr > 0); 3758 } 3759 3760 /* Step 2: clear hash table */ 3761 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3762 struct hlist_head *h = &inet6_addr_lst[i]; 3763 3764 spin_lock_bh(&addrconf_hash_lock); 3765 restart: 3766 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3767 if (ifa->idev == idev) { 3768 addrconf_del_dad_work(ifa); 3769 /* combined flag + permanent flag decide if 3770 * address is retained on a down event 3771 */ 3772 if (!keep_addr || 3773 !(ifa->flags & IFA_F_PERMANENT) || 3774 addr_is_local(&ifa->addr)) { 3775 hlist_del_init_rcu(&ifa->addr_lst); 3776 goto restart; 3777 } 3778 } 3779 } 3780 spin_unlock_bh(&addrconf_hash_lock); 3781 } 3782 3783 write_lock_bh(&idev->lock); 3784 3785 addrconf_del_rs_timer(idev); 3786 3787 /* Step 2: clear flags for stateless addrconf */ 3788 if (!unregister) 3789 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3790 3791 /* Step 3: clear tempaddr list */ 3792 while (!list_empty(&idev->tempaddr_list)) { 3793 ifa = list_first_entry(&idev->tempaddr_list, 3794 struct inet6_ifaddr, tmp_list); 3795 list_del(&ifa->tmp_list); 3796 write_unlock_bh(&idev->lock); 3797 spin_lock_bh(&ifa->lock); 3798 3799 if (ifa->ifpub) { 3800 in6_ifa_put(ifa->ifpub); 3801 ifa->ifpub = NULL; 3802 } 3803 spin_unlock_bh(&ifa->lock); 3804 in6_ifa_put(ifa); 3805 write_lock_bh(&idev->lock); 3806 } 3807 3808 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3809 struct fib6_info *rt = NULL; 3810 bool keep; 3811 3812 addrconf_del_dad_work(ifa); 3813 3814 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3815 !addr_is_local(&ifa->addr); 3816 3817 write_unlock_bh(&idev->lock); 3818 spin_lock_bh(&ifa->lock); 3819 3820 if (keep) { 3821 /* set state to skip the notifier below */ 3822 state = INET6_IFADDR_STATE_DEAD; 3823 ifa->state = INET6_IFADDR_STATE_PREDAD; 3824 if (!(ifa->flags & IFA_F_NODAD)) 3825 ifa->flags |= IFA_F_TENTATIVE; 3826 3827 rt = ifa->rt; 3828 ifa->rt = NULL; 3829 } else { 3830 state = ifa->state; 3831 ifa->state = INET6_IFADDR_STATE_DEAD; 3832 } 3833 3834 spin_unlock_bh(&ifa->lock); 3835 3836 if (rt) 3837 ip6_del_rt(net, rt, false); 3838 3839 if (state != INET6_IFADDR_STATE_DEAD) { 3840 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3841 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3842 } else { 3843 if (idev->cnf.forwarding) 3844 addrconf_leave_anycast(ifa); 3845 addrconf_leave_solict(ifa->idev, &ifa->addr); 3846 } 3847 3848 write_lock_bh(&idev->lock); 3849 if (!keep) { 3850 list_del_rcu(&ifa->if_list); 3851 in6_ifa_put(ifa); 3852 } 3853 } 3854 3855 write_unlock_bh(&idev->lock); 3856 3857 /* Step 5: Discard anycast and multicast list */ 3858 if (unregister) { 3859 ipv6_ac_destroy_dev(idev); 3860 ipv6_mc_destroy_dev(idev); 3861 } else { 3862 ipv6_mc_down(idev); 3863 } 3864 3865 idev->tstamp = jiffies; 3866 idev->ra_mtu = 0; 3867 3868 /* Last: Shot the device (if unregistered) */ 3869 if (unregister) { 3870 addrconf_sysctl_unregister(idev); 3871 neigh_parms_release(&nd_tbl, idev->nd_parms); 3872 neigh_ifdown(&nd_tbl, dev); 3873 in6_dev_put(idev); 3874 } 3875 return 0; 3876 } 3877 3878 static void addrconf_rs_timer(struct timer_list *t) 3879 { 3880 struct inet6_dev *idev = from_timer(idev, t, rs_timer); 3881 struct net_device *dev = idev->dev; 3882 struct in6_addr lladdr; 3883 3884 write_lock(&idev->lock); 3885 if (idev->dead || !(idev->if_flags & IF_READY)) 3886 goto out; 3887 3888 if (!ipv6_accept_ra(idev)) 3889 goto out; 3890 3891 /* Announcement received after solicitation was sent */ 3892 if (idev->if_flags & IF_RA_RCVD) 3893 goto out; 3894 3895 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3896 write_unlock(&idev->lock); 3897 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3898 ndisc_send_rs(dev, &lladdr, 3899 &in6addr_linklocal_allrouters); 3900 else 3901 goto put; 3902 3903 write_lock(&idev->lock); 3904 idev->rs_interval = rfc3315_s14_backoff_update( 3905 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3906 /* The wait after the last probe can be shorter */ 3907 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3908 idev->cnf.rtr_solicits) ? 3909 idev->cnf.rtr_solicit_delay : 3910 idev->rs_interval); 3911 } else { 3912 /* 3913 * Note: we do not support deprecated "all on-link" 3914 * assumption any longer. 3915 */ 3916 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3917 } 3918 3919 out: 3920 write_unlock(&idev->lock); 3921 put: 3922 in6_dev_put(idev); 3923 } 3924 3925 /* 3926 * Duplicate Address Detection 3927 */ 3928 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3929 { 3930 unsigned long rand_num; 3931 struct inet6_dev *idev = ifp->idev; 3932 u64 nonce; 3933 3934 if (ifp->flags & IFA_F_OPTIMISTIC) 3935 rand_num = 0; 3936 else 3937 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3938 3939 nonce = 0; 3940 if (idev->cnf.enhanced_dad || 3941 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 3942 do 3943 get_random_bytes(&nonce, 6); 3944 while (nonce == 0); 3945 } 3946 ifp->dad_nonce = nonce; 3947 ifp->dad_probes = idev->cnf.dad_transmits; 3948 addrconf_mod_dad_work(ifp, rand_num); 3949 } 3950 3951 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3952 { 3953 struct inet6_dev *idev = ifp->idev; 3954 struct net_device *dev = idev->dev; 3955 bool bump_id, notify = false; 3956 struct net *net; 3957 3958 addrconf_join_solict(dev, &ifp->addr); 3959 3960 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3961 3962 read_lock_bh(&idev->lock); 3963 spin_lock(&ifp->lock); 3964 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3965 goto out; 3966 3967 net = dev_net(dev); 3968 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3969 (net->ipv6.devconf_all->accept_dad < 1 && 3970 idev->cnf.accept_dad < 1) || 3971 !(ifp->flags&IFA_F_TENTATIVE) || 3972 ifp->flags & IFA_F_NODAD) { 3973 bool send_na = false; 3974 3975 if (ifp->flags & IFA_F_TENTATIVE && 3976 !(ifp->flags & IFA_F_OPTIMISTIC)) 3977 send_na = true; 3978 bump_id = ifp->flags & IFA_F_TENTATIVE; 3979 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3980 spin_unlock(&ifp->lock); 3981 read_unlock_bh(&idev->lock); 3982 3983 addrconf_dad_completed(ifp, bump_id, send_na); 3984 return; 3985 } 3986 3987 if (!(idev->if_flags & IF_READY)) { 3988 spin_unlock(&ifp->lock); 3989 read_unlock_bh(&idev->lock); 3990 /* 3991 * If the device is not ready: 3992 * - keep it tentative if it is a permanent address. 3993 * - otherwise, kill it. 3994 */ 3995 in6_ifa_hold(ifp); 3996 addrconf_dad_stop(ifp, 0); 3997 return; 3998 } 3999 4000 /* 4001 * Optimistic nodes can start receiving 4002 * Frames right away 4003 */ 4004 if (ifp->flags & IFA_F_OPTIMISTIC) { 4005 ip6_ins_rt(net, ifp->rt); 4006 if (ipv6_use_optimistic_addr(net, idev)) { 4007 /* Because optimistic nodes can use this address, 4008 * notify listeners. If DAD fails, RTM_DELADDR is sent. 4009 */ 4010 notify = true; 4011 } 4012 } 4013 4014 addrconf_dad_kick(ifp); 4015 out: 4016 spin_unlock(&ifp->lock); 4017 read_unlock_bh(&idev->lock); 4018 if (notify) 4019 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4020 } 4021 4022 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 4023 { 4024 bool begin_dad = false; 4025 4026 spin_lock_bh(&ifp->lock); 4027 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 4028 ifp->state = INET6_IFADDR_STATE_PREDAD; 4029 begin_dad = true; 4030 } 4031 spin_unlock_bh(&ifp->lock); 4032 4033 if (begin_dad) 4034 addrconf_mod_dad_work(ifp, 0); 4035 } 4036 4037 static void addrconf_dad_work(struct work_struct *w) 4038 { 4039 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 4040 struct inet6_ifaddr, 4041 dad_work); 4042 struct inet6_dev *idev = ifp->idev; 4043 bool bump_id, disable_ipv6 = false; 4044 struct in6_addr mcaddr; 4045 4046 enum { 4047 DAD_PROCESS, 4048 DAD_BEGIN, 4049 DAD_ABORT, 4050 } action = DAD_PROCESS; 4051 4052 rtnl_lock(); 4053 4054 spin_lock_bh(&ifp->lock); 4055 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 4056 action = DAD_BEGIN; 4057 ifp->state = INET6_IFADDR_STATE_DAD; 4058 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 4059 action = DAD_ABORT; 4060 ifp->state = INET6_IFADDR_STATE_POSTDAD; 4061 4062 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 || 4063 idev->cnf.accept_dad > 1) && 4064 !idev->cnf.disable_ipv6 && 4065 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 4066 struct in6_addr addr; 4067 4068 addr.s6_addr32[0] = htonl(0xfe800000); 4069 addr.s6_addr32[1] = 0; 4070 4071 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 4072 ipv6_addr_equal(&ifp->addr, &addr)) { 4073 /* DAD failed for link-local based on MAC */ 4074 idev->cnf.disable_ipv6 = 1; 4075 4076 pr_info("%s: IPv6 being disabled!\n", 4077 ifp->idev->dev->name); 4078 disable_ipv6 = true; 4079 } 4080 } 4081 } 4082 spin_unlock_bh(&ifp->lock); 4083 4084 if (action == DAD_BEGIN) { 4085 addrconf_dad_begin(ifp); 4086 goto out; 4087 } else if (action == DAD_ABORT) { 4088 in6_ifa_hold(ifp); 4089 addrconf_dad_stop(ifp, 1); 4090 if (disable_ipv6) 4091 addrconf_ifdown(idev->dev, false); 4092 goto out; 4093 } 4094 4095 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 4096 goto out; 4097 4098 write_lock_bh(&idev->lock); 4099 if (idev->dead || !(idev->if_flags & IF_READY)) { 4100 write_unlock_bh(&idev->lock); 4101 goto out; 4102 } 4103 4104 spin_lock(&ifp->lock); 4105 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 4106 spin_unlock(&ifp->lock); 4107 write_unlock_bh(&idev->lock); 4108 goto out; 4109 } 4110 4111 if (ifp->dad_probes == 0) { 4112 bool send_na = false; 4113 4114 /* 4115 * DAD was successful 4116 */ 4117 4118 if (ifp->flags & IFA_F_TENTATIVE && 4119 !(ifp->flags & IFA_F_OPTIMISTIC)) 4120 send_na = true; 4121 bump_id = ifp->flags & IFA_F_TENTATIVE; 4122 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4123 spin_unlock(&ifp->lock); 4124 write_unlock_bh(&idev->lock); 4125 4126 addrconf_dad_completed(ifp, bump_id, send_na); 4127 4128 goto out; 4129 } 4130 4131 ifp->dad_probes--; 4132 addrconf_mod_dad_work(ifp, 4133 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), 4134 HZ/100)); 4135 spin_unlock(&ifp->lock); 4136 write_unlock_bh(&idev->lock); 4137 4138 /* send a neighbour solicitation for our addr */ 4139 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 4140 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 4141 ifp->dad_nonce); 4142 out: 4143 in6_ifa_put(ifp); 4144 rtnl_unlock(); 4145 } 4146 4147 /* ifp->idev must be at least read locked */ 4148 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4149 { 4150 struct inet6_ifaddr *ifpiter; 4151 struct inet6_dev *idev = ifp->idev; 4152 4153 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4154 if (ifpiter->scope > IFA_LINK) 4155 break; 4156 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4157 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4158 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4159 IFA_F_PERMANENT) 4160 return false; 4161 } 4162 return true; 4163 } 4164 4165 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 4166 bool send_na) 4167 { 4168 struct net_device *dev = ifp->idev->dev; 4169 struct in6_addr lladdr; 4170 bool send_rs, send_mld; 4171 4172 addrconf_del_dad_work(ifp); 4173 4174 /* 4175 * Configure the address for reception. Now it is valid. 4176 */ 4177 4178 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4179 4180 /* If added prefix is link local and we are prepared to process 4181 router advertisements, start sending router solicitations. 4182 */ 4183 4184 read_lock_bh(&ifp->idev->lock); 4185 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4186 send_rs = send_mld && 4187 ipv6_accept_ra(ifp->idev) && 4188 ifp->idev->cnf.rtr_solicits != 0 && 4189 (dev->flags&IFF_LOOPBACK) == 0; 4190 read_unlock_bh(&ifp->idev->lock); 4191 4192 /* While dad is in progress mld report's source address is in6_addrany. 4193 * Resend with proper ll now. 4194 */ 4195 if (send_mld) 4196 ipv6_mc_dad_complete(ifp->idev); 4197 4198 /* send unsolicited NA if enabled */ 4199 if (send_na && 4200 (ifp->idev->cnf.ndisc_notify || 4201 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) { 4202 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr, 4203 /*router=*/ !!ifp->idev->cnf.forwarding, 4204 /*solicited=*/ false, /*override=*/ true, 4205 /*inc_opt=*/ true); 4206 } 4207 4208 if (send_rs) { 4209 /* 4210 * If a host as already performed a random delay 4211 * [...] as part of DAD [...] there is no need 4212 * to delay again before sending the first RS 4213 */ 4214 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4215 return; 4216 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4217 4218 write_lock_bh(&ifp->idev->lock); 4219 spin_lock(&ifp->lock); 4220 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4221 ifp->idev->cnf.rtr_solicit_interval); 4222 ifp->idev->rs_probes = 1; 4223 ifp->idev->if_flags |= IF_RS_SENT; 4224 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4225 spin_unlock(&ifp->lock); 4226 write_unlock_bh(&ifp->idev->lock); 4227 } 4228 4229 if (bump_id) 4230 rt_genid_bump_ipv6(dev_net(dev)); 4231 4232 /* Make sure that a new temporary address will be created 4233 * before this temporary address becomes deprecated. 4234 */ 4235 if (ifp->flags & IFA_F_TEMPORARY) 4236 addrconf_verify_rtnl(); 4237 } 4238 4239 static void addrconf_dad_run(struct inet6_dev *idev, bool restart) 4240 { 4241 struct inet6_ifaddr *ifp; 4242 4243 read_lock_bh(&idev->lock); 4244 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4245 spin_lock(&ifp->lock); 4246 if ((ifp->flags & IFA_F_TENTATIVE && 4247 ifp->state == INET6_IFADDR_STATE_DAD) || restart) { 4248 if (restart) 4249 ifp->state = INET6_IFADDR_STATE_PREDAD; 4250 addrconf_dad_kick(ifp); 4251 } 4252 spin_unlock(&ifp->lock); 4253 } 4254 read_unlock_bh(&idev->lock); 4255 } 4256 4257 #ifdef CONFIG_PROC_FS 4258 struct if6_iter_state { 4259 struct seq_net_private p; 4260 int bucket; 4261 int offset; 4262 }; 4263 4264 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4265 { 4266 struct if6_iter_state *state = seq->private; 4267 struct net *net = seq_file_net(seq); 4268 struct inet6_ifaddr *ifa = NULL; 4269 int p = 0; 4270 4271 /* initial bucket if pos is 0 */ 4272 if (pos == 0) { 4273 state->bucket = 0; 4274 state->offset = 0; 4275 } 4276 4277 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4278 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket], 4279 addr_lst) { 4280 if (!net_eq(dev_net(ifa->idev->dev), net)) 4281 continue; 4282 /* sync with offset */ 4283 if (p < state->offset) { 4284 p++; 4285 continue; 4286 } 4287 return ifa; 4288 } 4289 4290 /* prepare for next bucket */ 4291 state->offset = 0; 4292 p = 0; 4293 } 4294 return NULL; 4295 } 4296 4297 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4298 struct inet6_ifaddr *ifa) 4299 { 4300 struct if6_iter_state *state = seq->private; 4301 struct net *net = seq_file_net(seq); 4302 4303 hlist_for_each_entry_continue_rcu(ifa, addr_lst) { 4304 if (!net_eq(dev_net(ifa->idev->dev), net)) 4305 continue; 4306 state->offset++; 4307 return ifa; 4308 } 4309 4310 state->offset = 0; 4311 while (++state->bucket < IN6_ADDR_HSIZE) { 4312 hlist_for_each_entry_rcu(ifa, 4313 &inet6_addr_lst[state->bucket], addr_lst) { 4314 if (!net_eq(dev_net(ifa->idev->dev), net)) 4315 continue; 4316 return ifa; 4317 } 4318 } 4319 4320 return NULL; 4321 } 4322 4323 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4324 __acquires(rcu) 4325 { 4326 rcu_read_lock(); 4327 return if6_get_first(seq, *pos); 4328 } 4329 4330 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4331 { 4332 struct inet6_ifaddr *ifa; 4333 4334 ifa = if6_get_next(seq, v); 4335 ++*pos; 4336 return ifa; 4337 } 4338 4339 static void if6_seq_stop(struct seq_file *seq, void *v) 4340 __releases(rcu) 4341 { 4342 rcu_read_unlock(); 4343 } 4344 4345 static int if6_seq_show(struct seq_file *seq, void *v) 4346 { 4347 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4348 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4349 &ifp->addr, 4350 ifp->idev->dev->ifindex, 4351 ifp->prefix_len, 4352 ifp->scope, 4353 (u8) ifp->flags, 4354 ifp->idev->dev->name); 4355 return 0; 4356 } 4357 4358 static const struct seq_operations if6_seq_ops = { 4359 .start = if6_seq_start, 4360 .next = if6_seq_next, 4361 .show = if6_seq_show, 4362 .stop = if6_seq_stop, 4363 }; 4364 4365 static int __net_init if6_proc_net_init(struct net *net) 4366 { 4367 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops, 4368 sizeof(struct if6_iter_state))) 4369 return -ENOMEM; 4370 return 0; 4371 } 4372 4373 static void __net_exit if6_proc_net_exit(struct net *net) 4374 { 4375 remove_proc_entry("if_inet6", net->proc_net); 4376 } 4377 4378 static struct pernet_operations if6_proc_net_ops = { 4379 .init = if6_proc_net_init, 4380 .exit = if6_proc_net_exit, 4381 }; 4382 4383 int __init if6_proc_init(void) 4384 { 4385 return register_pernet_subsys(&if6_proc_net_ops); 4386 } 4387 4388 void if6_proc_exit(void) 4389 { 4390 unregister_pernet_subsys(&if6_proc_net_ops); 4391 } 4392 #endif /* CONFIG_PROC_FS */ 4393 4394 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4395 /* Check if address is a home address configured on any interface. */ 4396 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4397 { 4398 unsigned int hash = inet6_addr_hash(net, addr); 4399 struct inet6_ifaddr *ifp = NULL; 4400 int ret = 0; 4401 4402 rcu_read_lock(); 4403 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 4404 if (!net_eq(dev_net(ifp->idev->dev), net)) 4405 continue; 4406 if (ipv6_addr_equal(&ifp->addr, addr) && 4407 (ifp->flags & IFA_F_HOMEADDRESS)) { 4408 ret = 1; 4409 break; 4410 } 4411 } 4412 rcu_read_unlock(); 4413 return ret; 4414 } 4415 #endif 4416 4417 /* RFC6554 has some algorithm to avoid loops in segment routing by 4418 * checking if the segments contains any of a local interface address. 4419 * 4420 * Quote: 4421 * 4422 * To detect loops in the SRH, a router MUST determine if the SRH 4423 * includes multiple addresses assigned to any interface on that router. 4424 * If such addresses appear more than once and are separated by at least 4425 * one address not assigned to that router. 4426 */ 4427 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs, 4428 unsigned char nsegs) 4429 { 4430 const struct in6_addr *addr; 4431 int i, ret = 0, found = 0; 4432 struct inet6_ifaddr *ifp; 4433 bool separated = false; 4434 unsigned int hash; 4435 bool hash_found; 4436 4437 rcu_read_lock(); 4438 for (i = 0; i < nsegs; i++) { 4439 addr = &segs[i]; 4440 hash = inet6_addr_hash(net, addr); 4441 4442 hash_found = false; 4443 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 4444 if (!net_eq(dev_net(ifp->idev->dev), net)) 4445 continue; 4446 4447 if (ipv6_addr_equal(&ifp->addr, addr)) { 4448 hash_found = true; 4449 break; 4450 } 4451 } 4452 4453 if (hash_found) { 4454 if (found > 1 && separated) { 4455 ret = 1; 4456 break; 4457 } 4458 4459 separated = false; 4460 found++; 4461 } else { 4462 separated = true; 4463 } 4464 } 4465 rcu_read_unlock(); 4466 4467 return ret; 4468 } 4469 4470 /* 4471 * Periodic address status verification 4472 */ 4473 4474 static void addrconf_verify_rtnl(void) 4475 { 4476 unsigned long now, next, next_sec, next_sched; 4477 struct inet6_ifaddr *ifp; 4478 int i; 4479 4480 ASSERT_RTNL(); 4481 4482 rcu_read_lock_bh(); 4483 now = jiffies; 4484 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4485 4486 cancel_delayed_work(&addr_chk_work); 4487 4488 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4489 restart: 4490 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4491 unsigned long age; 4492 4493 /* When setting preferred_lft to a value not zero or 4494 * infinity, while valid_lft is infinity 4495 * IFA_F_PERMANENT has a non-infinity life time. 4496 */ 4497 if ((ifp->flags & IFA_F_PERMANENT) && 4498 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4499 continue; 4500 4501 spin_lock(&ifp->lock); 4502 /* We try to batch several events at once. */ 4503 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4504 4505 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4506 age >= ifp->valid_lft) { 4507 spin_unlock(&ifp->lock); 4508 in6_ifa_hold(ifp); 4509 rcu_read_unlock_bh(); 4510 ipv6_del_addr(ifp); 4511 rcu_read_lock_bh(); 4512 goto restart; 4513 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4514 spin_unlock(&ifp->lock); 4515 continue; 4516 } else if (age >= ifp->prefered_lft) { 4517 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4518 int deprecate = 0; 4519 4520 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4521 deprecate = 1; 4522 ifp->flags |= IFA_F_DEPRECATED; 4523 } 4524 4525 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4526 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4527 next = ifp->tstamp + ifp->valid_lft * HZ; 4528 4529 spin_unlock(&ifp->lock); 4530 4531 if (deprecate) { 4532 in6_ifa_hold(ifp); 4533 4534 ipv6_ifa_notify(0, ifp); 4535 in6_ifa_put(ifp); 4536 goto restart; 4537 } 4538 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4539 !(ifp->flags&IFA_F_TENTATIVE)) { 4540 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4541 ifp->idev->cnf.dad_transmits * 4542 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 4543 4544 if (age >= ifp->prefered_lft - regen_advance) { 4545 struct inet6_ifaddr *ifpub = ifp->ifpub; 4546 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4547 next = ifp->tstamp + ifp->prefered_lft * HZ; 4548 if (!ifp->regen_count && ifpub) { 4549 ifp->regen_count++; 4550 in6_ifa_hold(ifp); 4551 in6_ifa_hold(ifpub); 4552 spin_unlock(&ifp->lock); 4553 4554 spin_lock(&ifpub->lock); 4555 ifpub->regen_count = 0; 4556 spin_unlock(&ifpub->lock); 4557 rcu_read_unlock_bh(); 4558 ipv6_create_tempaddr(ifpub, true); 4559 in6_ifa_put(ifpub); 4560 in6_ifa_put(ifp); 4561 rcu_read_lock_bh(); 4562 goto restart; 4563 } 4564 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4565 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4566 spin_unlock(&ifp->lock); 4567 } else { 4568 /* ifp->prefered_lft <= ifp->valid_lft */ 4569 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4570 next = ifp->tstamp + ifp->prefered_lft * HZ; 4571 spin_unlock(&ifp->lock); 4572 } 4573 } 4574 } 4575 4576 next_sec = round_jiffies_up(next); 4577 next_sched = next; 4578 4579 /* If rounded timeout is accurate enough, accept it. */ 4580 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4581 next_sched = next_sec; 4582 4583 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4584 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4585 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4586 4587 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4588 now, next, next_sec, next_sched); 4589 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4590 rcu_read_unlock_bh(); 4591 } 4592 4593 static void addrconf_verify_work(struct work_struct *w) 4594 { 4595 rtnl_lock(); 4596 addrconf_verify_rtnl(); 4597 rtnl_unlock(); 4598 } 4599 4600 static void addrconf_verify(void) 4601 { 4602 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4603 } 4604 4605 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4606 struct in6_addr **peer_pfx) 4607 { 4608 struct in6_addr *pfx = NULL; 4609 4610 *peer_pfx = NULL; 4611 4612 if (addr) 4613 pfx = nla_data(addr); 4614 4615 if (local) { 4616 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4617 *peer_pfx = pfx; 4618 pfx = nla_data(local); 4619 } 4620 4621 return pfx; 4622 } 4623 4624 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4625 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4626 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4627 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4628 [IFA_FLAGS] = { .len = sizeof(u32) }, 4629 [IFA_RT_PRIORITY] = { .len = sizeof(u32) }, 4630 [IFA_TARGET_NETNSID] = { .type = NLA_S32 }, 4631 }; 4632 4633 static int 4634 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4635 struct netlink_ext_ack *extack) 4636 { 4637 struct net *net = sock_net(skb->sk); 4638 struct ifaddrmsg *ifm; 4639 struct nlattr *tb[IFA_MAX+1]; 4640 struct in6_addr *pfx, *peer_pfx; 4641 u32 ifa_flags; 4642 int err; 4643 4644 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4645 ifa_ipv6_policy, extack); 4646 if (err < 0) 4647 return err; 4648 4649 ifm = nlmsg_data(nlh); 4650 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4651 if (!pfx) 4652 return -EINVAL; 4653 4654 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4655 4656 /* We ignore other flags so far. */ 4657 ifa_flags &= IFA_F_MANAGETEMPADDR; 4658 4659 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4660 ifm->ifa_prefixlen); 4661 } 4662 4663 static int modify_prefix_route(struct inet6_ifaddr *ifp, 4664 unsigned long expires, u32 flags, 4665 bool modify_peer) 4666 { 4667 struct fib6_info *f6i; 4668 u32 prio; 4669 4670 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4671 ifp->prefix_len, 4672 ifp->idev->dev, 0, RTF_DEFAULT, true); 4673 if (!f6i) 4674 return -ENOENT; 4675 4676 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF; 4677 if (f6i->fib6_metric != prio) { 4678 /* delete old one */ 4679 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 4680 4681 /* add new one */ 4682 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4683 ifp->prefix_len, 4684 ifp->rt_priority, ifp->idev->dev, 4685 expires, flags, GFP_KERNEL); 4686 } else { 4687 if (!expires) 4688 fib6_clean_expires(f6i); 4689 else 4690 fib6_set_expires(f6i, expires); 4691 4692 fib6_info_release(f6i); 4693 } 4694 4695 return 0; 4696 } 4697 4698 static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg) 4699 { 4700 u32 flags; 4701 clock_t expires; 4702 unsigned long timeout; 4703 bool was_managetempaddr; 4704 bool had_prefixroute; 4705 bool new_peer = false; 4706 4707 ASSERT_RTNL(); 4708 4709 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 4710 return -EINVAL; 4711 4712 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && 4713 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4714 return -EINVAL; 4715 4716 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED) 4717 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC; 4718 4719 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 4720 if (addrconf_finite_timeout(timeout)) { 4721 expires = jiffies_to_clock_t(timeout * HZ); 4722 cfg->valid_lft = timeout; 4723 flags = RTF_EXPIRES; 4724 } else { 4725 expires = 0; 4726 flags = 0; 4727 cfg->ifa_flags |= IFA_F_PERMANENT; 4728 } 4729 4730 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 4731 if (addrconf_finite_timeout(timeout)) { 4732 if (timeout == 0) 4733 cfg->ifa_flags |= IFA_F_DEPRECATED; 4734 cfg->preferred_lft = timeout; 4735 } 4736 4737 if (cfg->peer_pfx && 4738 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) { 4739 if (!ipv6_addr_any(&ifp->peer_addr)) 4740 cleanup_prefix_route(ifp, expires, true, true); 4741 new_peer = true; 4742 } 4743 4744 spin_lock_bh(&ifp->lock); 4745 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4746 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4747 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4748 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4749 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4750 IFA_F_NOPREFIXROUTE); 4751 ifp->flags |= cfg->ifa_flags; 4752 ifp->tstamp = jiffies; 4753 ifp->valid_lft = cfg->valid_lft; 4754 ifp->prefered_lft = cfg->preferred_lft; 4755 4756 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority) 4757 ifp->rt_priority = cfg->rt_priority; 4758 4759 if (new_peer) 4760 ifp->peer_addr = *cfg->peer_pfx; 4761 4762 spin_unlock_bh(&ifp->lock); 4763 if (!(ifp->flags&IFA_F_TENTATIVE)) 4764 ipv6_ifa_notify(0, ifp); 4765 4766 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 4767 int rc = -ENOENT; 4768 4769 if (had_prefixroute) 4770 rc = modify_prefix_route(ifp, expires, flags, false); 4771 4772 /* prefix route could have been deleted; if so restore it */ 4773 if (rc == -ENOENT) { 4774 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4775 ifp->rt_priority, ifp->idev->dev, 4776 expires, flags, GFP_KERNEL); 4777 } 4778 4779 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr)) 4780 rc = modify_prefix_route(ifp, expires, flags, true); 4781 4782 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) { 4783 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len, 4784 ifp->rt_priority, ifp->idev->dev, 4785 expires, flags, GFP_KERNEL); 4786 } 4787 } else if (had_prefixroute) { 4788 enum cleanup_prefix_rt_t action; 4789 unsigned long rt_expires; 4790 4791 write_lock_bh(&ifp->idev->lock); 4792 action = check_cleanup_prefix_route(ifp, &rt_expires); 4793 write_unlock_bh(&ifp->idev->lock); 4794 4795 if (action != CLEANUP_PREFIX_RT_NOP) { 4796 cleanup_prefix_route(ifp, rt_expires, 4797 action == CLEANUP_PREFIX_RT_DEL, false); 4798 } 4799 } 4800 4801 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4802 if (was_managetempaddr && 4803 !(ifp->flags & IFA_F_MANAGETEMPADDR)) { 4804 cfg->valid_lft = 0; 4805 cfg->preferred_lft = 0; 4806 } 4807 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft, 4808 cfg->preferred_lft, !was_managetempaddr, 4809 jiffies); 4810 } 4811 4812 addrconf_verify_rtnl(); 4813 4814 return 0; 4815 } 4816 4817 static int 4818 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4819 struct netlink_ext_ack *extack) 4820 { 4821 struct net *net = sock_net(skb->sk); 4822 struct ifaddrmsg *ifm; 4823 struct nlattr *tb[IFA_MAX+1]; 4824 struct in6_addr *peer_pfx; 4825 struct inet6_ifaddr *ifa; 4826 struct net_device *dev; 4827 struct inet6_dev *idev; 4828 struct ifa6_config cfg; 4829 int err; 4830 4831 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4832 ifa_ipv6_policy, extack); 4833 if (err < 0) 4834 return err; 4835 4836 memset(&cfg, 0, sizeof(cfg)); 4837 4838 ifm = nlmsg_data(nlh); 4839 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4840 if (!cfg.pfx) 4841 return -EINVAL; 4842 4843 cfg.peer_pfx = peer_pfx; 4844 cfg.plen = ifm->ifa_prefixlen; 4845 if (tb[IFA_RT_PRIORITY]) 4846 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]); 4847 4848 cfg.valid_lft = INFINITY_LIFE_TIME; 4849 cfg.preferred_lft = INFINITY_LIFE_TIME; 4850 4851 if (tb[IFA_CACHEINFO]) { 4852 struct ifa_cacheinfo *ci; 4853 4854 ci = nla_data(tb[IFA_CACHEINFO]); 4855 cfg.valid_lft = ci->ifa_valid; 4856 cfg.preferred_lft = ci->ifa_prefered; 4857 } 4858 4859 dev = __dev_get_by_index(net, ifm->ifa_index); 4860 if (!dev) 4861 return -ENODEV; 4862 4863 if (tb[IFA_FLAGS]) 4864 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]); 4865 else 4866 cfg.ifa_flags = ifm->ifa_flags; 4867 4868 /* We ignore other flags so far. */ 4869 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | 4870 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE | 4871 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC; 4872 4873 idev = ipv6_find_idev(dev); 4874 if (IS_ERR(idev)) 4875 return PTR_ERR(idev); 4876 4877 if (!ipv6_allow_optimistic_dad(net, idev)) 4878 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC; 4879 4880 if (cfg.ifa_flags & IFA_F_NODAD && 4881 cfg.ifa_flags & IFA_F_OPTIMISTIC) { 4882 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive"); 4883 return -EINVAL; 4884 } 4885 4886 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1); 4887 if (!ifa) { 4888 /* 4889 * It would be best to check for !NLM_F_CREATE here but 4890 * userspace already relies on not having to provide this. 4891 */ 4892 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack); 4893 } 4894 4895 if (nlh->nlmsg_flags & NLM_F_EXCL || 4896 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4897 err = -EEXIST; 4898 else 4899 err = inet6_addr_modify(ifa, &cfg); 4900 4901 in6_ifa_put(ifa); 4902 4903 return err; 4904 } 4905 4906 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4907 u8 scope, int ifindex) 4908 { 4909 struct ifaddrmsg *ifm; 4910 4911 ifm = nlmsg_data(nlh); 4912 ifm->ifa_family = AF_INET6; 4913 ifm->ifa_prefixlen = prefixlen; 4914 ifm->ifa_flags = flags; 4915 ifm->ifa_scope = scope; 4916 ifm->ifa_index = ifindex; 4917 } 4918 4919 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4920 unsigned long tstamp, u32 preferred, u32 valid) 4921 { 4922 struct ifa_cacheinfo ci; 4923 4924 ci.cstamp = cstamp_delta(cstamp); 4925 ci.tstamp = cstamp_delta(tstamp); 4926 ci.ifa_prefered = preferred; 4927 ci.ifa_valid = valid; 4928 4929 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4930 } 4931 4932 static inline int rt_scope(int ifa_scope) 4933 { 4934 if (ifa_scope & IFA_HOST) 4935 return RT_SCOPE_HOST; 4936 else if (ifa_scope & IFA_LINK) 4937 return RT_SCOPE_LINK; 4938 else if (ifa_scope & IFA_SITE) 4939 return RT_SCOPE_SITE; 4940 else 4941 return RT_SCOPE_UNIVERSE; 4942 } 4943 4944 static inline int inet6_ifaddr_msgsize(void) 4945 { 4946 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4947 + nla_total_size(16) /* IFA_LOCAL */ 4948 + nla_total_size(16) /* IFA_ADDRESS */ 4949 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4950 + nla_total_size(4) /* IFA_FLAGS */ 4951 + nla_total_size(4) /* IFA_RT_PRIORITY */; 4952 } 4953 4954 enum addr_type_t { 4955 UNICAST_ADDR, 4956 MULTICAST_ADDR, 4957 ANYCAST_ADDR, 4958 }; 4959 4960 struct inet6_fill_args { 4961 u32 portid; 4962 u32 seq; 4963 int event; 4964 unsigned int flags; 4965 int netnsid; 4966 int ifindex; 4967 enum addr_type_t type; 4968 }; 4969 4970 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4971 struct inet6_fill_args *args) 4972 { 4973 struct nlmsghdr *nlh; 4974 u32 preferred, valid; 4975 4976 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 4977 sizeof(struct ifaddrmsg), args->flags); 4978 if (!nlh) 4979 return -EMSGSIZE; 4980 4981 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4982 ifa->idev->dev->ifindex); 4983 4984 if (args->netnsid >= 0 && 4985 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 4986 goto error; 4987 4988 if (!((ifa->flags&IFA_F_PERMANENT) && 4989 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4990 preferred = ifa->prefered_lft; 4991 valid = ifa->valid_lft; 4992 if (preferred != INFINITY_LIFE_TIME) { 4993 long tval = (jiffies - ifa->tstamp)/HZ; 4994 if (preferred > tval) 4995 preferred -= tval; 4996 else 4997 preferred = 0; 4998 if (valid != INFINITY_LIFE_TIME) { 4999 if (valid > tval) 5000 valid -= tval; 5001 else 5002 valid = 0; 5003 } 5004 } 5005 } else { 5006 preferred = INFINITY_LIFE_TIME; 5007 valid = INFINITY_LIFE_TIME; 5008 } 5009 5010 if (!ipv6_addr_any(&ifa->peer_addr)) { 5011 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 5012 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 5013 goto error; 5014 } else 5015 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 5016 goto error; 5017 5018 if (ifa->rt_priority && 5019 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority)) 5020 goto error; 5021 5022 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 5023 goto error; 5024 5025 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 5026 goto error; 5027 5028 nlmsg_end(skb, nlh); 5029 return 0; 5030 5031 error: 5032 nlmsg_cancel(skb, nlh); 5033 return -EMSGSIZE; 5034 } 5035 5036 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 5037 struct inet6_fill_args *args) 5038 { 5039 struct nlmsghdr *nlh; 5040 u8 scope = RT_SCOPE_UNIVERSE; 5041 int ifindex = ifmca->idev->dev->ifindex; 5042 5043 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 5044 scope = RT_SCOPE_SITE; 5045 5046 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5047 sizeof(struct ifaddrmsg), args->flags); 5048 if (!nlh) 5049 return -EMSGSIZE; 5050 5051 if (args->netnsid >= 0 && 5052 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5053 nlmsg_cancel(skb, nlh); 5054 return -EMSGSIZE; 5055 } 5056 5057 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5058 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 5059 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 5060 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5061 nlmsg_cancel(skb, nlh); 5062 return -EMSGSIZE; 5063 } 5064 5065 nlmsg_end(skb, nlh); 5066 return 0; 5067 } 5068 5069 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 5070 struct inet6_fill_args *args) 5071 { 5072 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt); 5073 int ifindex = dev ? dev->ifindex : 1; 5074 struct nlmsghdr *nlh; 5075 u8 scope = RT_SCOPE_UNIVERSE; 5076 5077 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 5078 scope = RT_SCOPE_SITE; 5079 5080 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5081 sizeof(struct ifaddrmsg), args->flags); 5082 if (!nlh) 5083 return -EMSGSIZE; 5084 5085 if (args->netnsid >= 0 && 5086 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5087 nlmsg_cancel(skb, nlh); 5088 return -EMSGSIZE; 5089 } 5090 5091 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5092 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 5093 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 5094 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5095 nlmsg_cancel(skb, nlh); 5096 return -EMSGSIZE; 5097 } 5098 5099 nlmsg_end(skb, nlh); 5100 return 0; 5101 } 5102 5103 /* called with rcu_read_lock() */ 5104 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 5105 struct netlink_callback *cb, int s_ip_idx, 5106 struct inet6_fill_args *fillargs) 5107 { 5108 struct ifmcaddr6 *ifmca; 5109 struct ifacaddr6 *ifaca; 5110 int ip_idx = 0; 5111 int err = 1; 5112 5113 read_lock_bh(&idev->lock); 5114 switch (fillargs->type) { 5115 case UNICAST_ADDR: { 5116 struct inet6_ifaddr *ifa; 5117 fillargs->event = RTM_NEWADDR; 5118 5119 /* unicast address incl. temp addr */ 5120 list_for_each_entry(ifa, &idev->addr_list, if_list) { 5121 if (ip_idx < s_ip_idx) 5122 goto next; 5123 err = inet6_fill_ifaddr(skb, ifa, fillargs); 5124 if (err < 0) 5125 break; 5126 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 5127 next: 5128 ip_idx++; 5129 } 5130 break; 5131 } 5132 case MULTICAST_ADDR: 5133 read_unlock_bh(&idev->lock); 5134 fillargs->event = RTM_GETMULTICAST; 5135 5136 /* multicast address */ 5137 for (ifmca = rcu_dereference(idev->mc_list); 5138 ifmca; 5139 ifmca = rcu_dereference(ifmca->next), ip_idx++) { 5140 if (ip_idx < s_ip_idx) 5141 continue; 5142 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs); 5143 if (err < 0) 5144 break; 5145 } 5146 read_lock_bh(&idev->lock); 5147 break; 5148 case ANYCAST_ADDR: 5149 fillargs->event = RTM_GETANYCAST; 5150 /* anycast address */ 5151 for (ifaca = idev->ac_list; ifaca; 5152 ifaca = ifaca->aca_next, ip_idx++) { 5153 if (ip_idx < s_ip_idx) 5154 continue; 5155 err = inet6_fill_ifacaddr(skb, ifaca, fillargs); 5156 if (err < 0) 5157 break; 5158 } 5159 break; 5160 default: 5161 break; 5162 } 5163 read_unlock_bh(&idev->lock); 5164 cb->args[2] = ip_idx; 5165 return err; 5166 } 5167 5168 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh, 5169 struct inet6_fill_args *fillargs, 5170 struct net **tgt_net, struct sock *sk, 5171 struct netlink_callback *cb) 5172 { 5173 struct netlink_ext_ack *extack = cb->extack; 5174 struct nlattr *tb[IFA_MAX+1]; 5175 struct ifaddrmsg *ifm; 5176 int err, i; 5177 5178 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5179 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request"); 5180 return -EINVAL; 5181 } 5182 5183 ifm = nlmsg_data(nlh); 5184 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5185 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request"); 5186 return -EINVAL; 5187 } 5188 5189 fillargs->ifindex = ifm->ifa_index; 5190 if (fillargs->ifindex) { 5191 cb->answer_flags |= NLM_F_DUMP_FILTERED; 5192 fillargs->flags |= NLM_F_DUMP_FILTERED; 5193 } 5194 5195 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5196 ifa_ipv6_policy, extack); 5197 if (err < 0) 5198 return err; 5199 5200 for (i = 0; i <= IFA_MAX; ++i) { 5201 if (!tb[i]) 5202 continue; 5203 5204 if (i == IFA_TARGET_NETNSID) { 5205 struct net *net; 5206 5207 fillargs->netnsid = nla_get_s32(tb[i]); 5208 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid); 5209 if (IS_ERR(net)) { 5210 fillargs->netnsid = -1; 5211 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id"); 5212 return PTR_ERR(net); 5213 } 5214 *tgt_net = net; 5215 } else { 5216 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); 5217 return -EINVAL; 5218 } 5219 } 5220 5221 return 0; 5222 } 5223 5224 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 5225 enum addr_type_t type) 5226 { 5227 const struct nlmsghdr *nlh = cb->nlh; 5228 struct inet6_fill_args fillargs = { 5229 .portid = NETLINK_CB(cb->skb).portid, 5230 .seq = cb->nlh->nlmsg_seq, 5231 .flags = NLM_F_MULTI, 5232 .netnsid = -1, 5233 .type = type, 5234 }; 5235 struct net *tgt_net = sock_net(skb->sk); 5236 int idx, s_idx, s_ip_idx; 5237 int h, s_h; 5238 struct net_device *dev; 5239 struct inet6_dev *idev; 5240 struct hlist_head *head; 5241 int err = 0; 5242 5243 s_h = cb->args[0]; 5244 s_idx = idx = cb->args[1]; 5245 s_ip_idx = cb->args[2]; 5246 5247 if (cb->strict_check) { 5248 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net, 5249 skb->sk, cb); 5250 if (err < 0) 5251 goto put_tgt_net; 5252 5253 err = 0; 5254 if (fillargs.ifindex) { 5255 dev = __dev_get_by_index(tgt_net, fillargs.ifindex); 5256 if (!dev) { 5257 err = -ENODEV; 5258 goto put_tgt_net; 5259 } 5260 idev = __in6_dev_get(dev); 5261 if (idev) { 5262 err = in6_dump_addrs(idev, skb, cb, s_ip_idx, 5263 &fillargs); 5264 if (err > 0) 5265 err = 0; 5266 } 5267 goto put_tgt_net; 5268 } 5269 } 5270 5271 rcu_read_lock(); 5272 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq; 5273 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5274 idx = 0; 5275 head = &tgt_net->dev_index_head[h]; 5276 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5277 if (idx < s_idx) 5278 goto cont; 5279 if (h > s_h || idx > s_idx) 5280 s_ip_idx = 0; 5281 idev = __in6_dev_get(dev); 5282 if (!idev) 5283 goto cont; 5284 5285 if (in6_dump_addrs(idev, skb, cb, s_ip_idx, 5286 &fillargs) < 0) 5287 goto done; 5288 cont: 5289 idx++; 5290 } 5291 } 5292 done: 5293 rcu_read_unlock(); 5294 cb->args[0] = h; 5295 cb->args[1] = idx; 5296 put_tgt_net: 5297 if (fillargs.netnsid >= 0) 5298 put_net(tgt_net); 5299 5300 return skb->len ? : err; 5301 } 5302 5303 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 5304 { 5305 enum addr_type_t type = UNICAST_ADDR; 5306 5307 return inet6_dump_addr(skb, cb, type); 5308 } 5309 5310 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 5311 { 5312 enum addr_type_t type = MULTICAST_ADDR; 5313 5314 return inet6_dump_addr(skb, cb, type); 5315 } 5316 5317 5318 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 5319 { 5320 enum addr_type_t type = ANYCAST_ADDR; 5321 5322 return inet6_dump_addr(skb, cb, type); 5323 } 5324 5325 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb, 5326 const struct nlmsghdr *nlh, 5327 struct nlattr **tb, 5328 struct netlink_ext_ack *extack) 5329 { 5330 struct ifaddrmsg *ifm; 5331 int i, err; 5332 5333 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5334 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request"); 5335 return -EINVAL; 5336 } 5337 5338 if (!netlink_strict_get_check(skb)) 5339 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 5340 ifa_ipv6_policy, extack); 5341 5342 ifm = nlmsg_data(nlh); 5343 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5344 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request"); 5345 return -EINVAL; 5346 } 5347 5348 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5349 ifa_ipv6_policy, extack); 5350 if (err) 5351 return err; 5352 5353 for (i = 0; i <= IFA_MAX; i++) { 5354 if (!tb[i]) 5355 continue; 5356 5357 switch (i) { 5358 case IFA_TARGET_NETNSID: 5359 case IFA_ADDRESS: 5360 case IFA_LOCAL: 5361 break; 5362 default: 5363 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request"); 5364 return -EINVAL; 5365 } 5366 } 5367 5368 return 0; 5369 } 5370 5371 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 5372 struct netlink_ext_ack *extack) 5373 { 5374 struct net *tgt_net = sock_net(in_skb->sk); 5375 struct inet6_fill_args fillargs = { 5376 .portid = NETLINK_CB(in_skb).portid, 5377 .seq = nlh->nlmsg_seq, 5378 .event = RTM_NEWADDR, 5379 .flags = 0, 5380 .netnsid = -1, 5381 }; 5382 struct ifaddrmsg *ifm; 5383 struct nlattr *tb[IFA_MAX+1]; 5384 struct in6_addr *addr = NULL, *peer; 5385 struct net_device *dev = NULL; 5386 struct inet6_ifaddr *ifa; 5387 struct sk_buff *skb; 5388 int err; 5389 5390 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack); 5391 if (err < 0) 5392 return err; 5393 5394 if (tb[IFA_TARGET_NETNSID]) { 5395 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]); 5396 5397 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk, 5398 fillargs.netnsid); 5399 if (IS_ERR(tgt_net)) 5400 return PTR_ERR(tgt_net); 5401 } 5402 5403 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 5404 if (!addr) 5405 return -EINVAL; 5406 5407 ifm = nlmsg_data(nlh); 5408 if (ifm->ifa_index) 5409 dev = dev_get_by_index(tgt_net, ifm->ifa_index); 5410 5411 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1); 5412 if (!ifa) { 5413 err = -EADDRNOTAVAIL; 5414 goto errout; 5415 } 5416 5417 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 5418 if (!skb) { 5419 err = -ENOBUFS; 5420 goto errout_ifa; 5421 } 5422 5423 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5424 if (err < 0) { 5425 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5426 WARN_ON(err == -EMSGSIZE); 5427 kfree_skb(skb); 5428 goto errout_ifa; 5429 } 5430 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid); 5431 errout_ifa: 5432 in6_ifa_put(ifa); 5433 errout: 5434 dev_put(dev); 5435 if (fillargs.netnsid >= 0) 5436 put_net(tgt_net); 5437 5438 return err; 5439 } 5440 5441 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 5442 { 5443 struct sk_buff *skb; 5444 struct net *net = dev_net(ifa->idev->dev); 5445 struct inet6_fill_args fillargs = { 5446 .portid = 0, 5447 .seq = 0, 5448 .event = event, 5449 .flags = 0, 5450 .netnsid = -1, 5451 }; 5452 int err = -ENOBUFS; 5453 5454 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 5455 if (!skb) 5456 goto errout; 5457 5458 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5459 if (err < 0) { 5460 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5461 WARN_ON(err == -EMSGSIZE); 5462 kfree_skb(skb); 5463 goto errout; 5464 } 5465 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 5466 return; 5467 errout: 5468 if (err < 0) 5469 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 5470 } 5471 5472 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 5473 __s32 *array, int bytes) 5474 { 5475 BUG_ON(bytes < (DEVCONF_MAX * 4)); 5476 5477 memset(array, 0, bytes); 5478 array[DEVCONF_FORWARDING] = cnf->forwarding; 5479 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 5480 array[DEVCONF_MTU6] = cnf->mtu6; 5481 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 5482 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 5483 array[DEVCONF_AUTOCONF] = cnf->autoconf; 5484 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 5485 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 5486 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5487 jiffies_to_msecs(cnf->rtr_solicit_interval); 5488 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5489 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 5490 array[DEVCONF_RTR_SOLICIT_DELAY] = 5491 jiffies_to_msecs(cnf->rtr_solicit_delay); 5492 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 5493 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5494 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 5495 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5496 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 5497 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 5498 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 5499 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 5500 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 5501 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 5502 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 5503 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 5504 array[DEVCONF_RA_DEFRTR_METRIC] = cnf->ra_defrtr_metric; 5505 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 5506 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 5507 #ifdef CONFIG_IPV6_ROUTER_PREF 5508 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 5509 array[DEVCONF_RTR_PROBE_INTERVAL] = 5510 jiffies_to_msecs(cnf->rtr_probe_interval); 5511 #ifdef CONFIG_IPV6_ROUTE_INFO 5512 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen; 5513 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 5514 #endif 5515 #endif 5516 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 5517 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 5518 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5519 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 5520 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 5521 #endif 5522 #ifdef CONFIG_IPV6_MROUTE 5523 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 5524 #endif 5525 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 5526 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 5527 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 5528 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 5529 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 5530 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 5531 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 5532 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 5533 /* we omit DEVCONF_STABLE_SECRET for now */ 5534 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 5535 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 5536 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 5537 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5538 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5539 #ifdef CONFIG_IPV6_SEG6_HMAC 5540 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5541 #endif 5542 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5543 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5544 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy; 5545 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass; 5546 array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled; 5547 array[DEVCONF_IOAM6_ENABLED] = cnf->ioam6_enabled; 5548 array[DEVCONF_IOAM6_ID] = cnf->ioam6_id; 5549 array[DEVCONF_IOAM6_ID_WIDE] = cnf->ioam6_id_wide; 5550 array[DEVCONF_NDISC_EVICT_NOCARRIER] = cnf->ndisc_evict_nocarrier; 5551 } 5552 5553 static inline size_t inet6_ifla6_size(void) 5554 { 5555 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5556 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5557 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5558 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5559 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5560 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */ 5561 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */ 5562 + nla_total_size(4) /* IFLA_INET6_RA_MTU */ 5563 + 0; 5564 } 5565 5566 static inline size_t inet6_if_nlmsg_size(void) 5567 { 5568 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5569 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5570 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5571 + nla_total_size(4) /* IFLA_MTU */ 5572 + nla_total_size(4) /* IFLA_LINK */ 5573 + nla_total_size(1) /* IFLA_OPERSTATE */ 5574 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5575 } 5576 5577 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5578 int bytes) 5579 { 5580 int i; 5581 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5582 BUG_ON(pad < 0); 5583 5584 /* Use put_unaligned() because stats may not be aligned for u64. */ 5585 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5586 for (i = 1; i < ICMP6_MIB_MAX; i++) 5587 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5588 5589 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5590 } 5591 5592 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5593 int bytes, size_t syncpoff) 5594 { 5595 int i, c; 5596 u64 buff[IPSTATS_MIB_MAX]; 5597 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5598 5599 BUG_ON(pad < 0); 5600 5601 memset(buff, 0, sizeof(buff)); 5602 buff[0] = IPSTATS_MIB_MAX; 5603 5604 for_each_possible_cpu(c) { 5605 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5606 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5607 } 5608 5609 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5610 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5611 } 5612 5613 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5614 int bytes) 5615 { 5616 switch (attrtype) { 5617 case IFLA_INET6_STATS: 5618 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5619 offsetof(struct ipstats_mib, syncp)); 5620 break; 5621 case IFLA_INET6_ICMP6STATS: 5622 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5623 break; 5624 } 5625 } 5626 5627 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5628 u32 ext_filter_mask) 5629 { 5630 struct nlattr *nla; 5631 struct ifla_cacheinfo ci; 5632 5633 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5634 goto nla_put_failure; 5635 ci.max_reasm_len = IPV6_MAXPLEN; 5636 ci.tstamp = cstamp_delta(idev->tstamp); 5637 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5638 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5639 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5640 goto nla_put_failure; 5641 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5642 if (!nla) 5643 goto nla_put_failure; 5644 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5645 5646 /* XXX - MC not implemented */ 5647 5648 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5649 return 0; 5650 5651 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5652 if (!nla) 5653 goto nla_put_failure; 5654 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5655 5656 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5657 if (!nla) 5658 goto nla_put_failure; 5659 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5660 5661 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5662 if (!nla) 5663 goto nla_put_failure; 5664 read_lock_bh(&idev->lock); 5665 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5666 read_unlock_bh(&idev->lock); 5667 5668 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5669 goto nla_put_failure; 5670 5671 if (idev->ra_mtu && 5672 nla_put_u32(skb, IFLA_INET6_RA_MTU, idev->ra_mtu)) 5673 goto nla_put_failure; 5674 5675 return 0; 5676 5677 nla_put_failure: 5678 return -EMSGSIZE; 5679 } 5680 5681 static size_t inet6_get_link_af_size(const struct net_device *dev, 5682 u32 ext_filter_mask) 5683 { 5684 if (!__in6_dev_get(dev)) 5685 return 0; 5686 5687 return inet6_ifla6_size(); 5688 } 5689 5690 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5691 u32 ext_filter_mask) 5692 { 5693 struct inet6_dev *idev = __in6_dev_get(dev); 5694 5695 if (!idev) 5696 return -ENODATA; 5697 5698 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5699 return -EMSGSIZE; 5700 5701 return 0; 5702 } 5703 5704 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token, 5705 struct netlink_ext_ack *extack) 5706 { 5707 struct inet6_ifaddr *ifp; 5708 struct net_device *dev = idev->dev; 5709 bool clear_token, update_rs = false; 5710 struct in6_addr ll_addr; 5711 5712 ASSERT_RTNL(); 5713 5714 if (!token) 5715 return -EINVAL; 5716 5717 if (dev->flags & IFF_LOOPBACK) { 5718 NL_SET_ERR_MSG_MOD(extack, "Device is loopback"); 5719 return -EINVAL; 5720 } 5721 5722 if (dev->flags & IFF_NOARP) { 5723 NL_SET_ERR_MSG_MOD(extack, 5724 "Device does not do neighbour discovery"); 5725 return -EINVAL; 5726 } 5727 5728 if (!ipv6_accept_ra(idev)) { 5729 NL_SET_ERR_MSG_MOD(extack, 5730 "Router advertisement is disabled on device"); 5731 return -EINVAL; 5732 } 5733 5734 if (idev->cnf.rtr_solicits == 0) { 5735 NL_SET_ERR_MSG(extack, 5736 "Router solicitation is disabled on device"); 5737 return -EINVAL; 5738 } 5739 5740 write_lock_bh(&idev->lock); 5741 5742 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5743 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5744 5745 write_unlock_bh(&idev->lock); 5746 5747 clear_token = ipv6_addr_any(token); 5748 if (clear_token) 5749 goto update_lft; 5750 5751 if (!idev->dead && (idev->if_flags & IF_READY) && 5752 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5753 IFA_F_OPTIMISTIC)) { 5754 /* If we're not ready, then normal ifup will take care 5755 * of this. Otherwise, we need to request our rs here. 5756 */ 5757 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5758 update_rs = true; 5759 } 5760 5761 update_lft: 5762 write_lock_bh(&idev->lock); 5763 5764 if (update_rs) { 5765 idev->if_flags |= IF_RS_SENT; 5766 idev->rs_interval = rfc3315_s14_backoff_init( 5767 idev->cnf.rtr_solicit_interval); 5768 idev->rs_probes = 1; 5769 addrconf_mod_rs_timer(idev, idev->rs_interval); 5770 } 5771 5772 /* Well, that's kinda nasty ... */ 5773 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5774 spin_lock(&ifp->lock); 5775 if (ifp->tokenized) { 5776 ifp->valid_lft = 0; 5777 ifp->prefered_lft = 0; 5778 } 5779 spin_unlock(&ifp->lock); 5780 } 5781 5782 write_unlock_bh(&idev->lock); 5783 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5784 addrconf_verify_rtnl(); 5785 return 0; 5786 } 5787 5788 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5789 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5790 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5791 [IFLA_INET6_RA_MTU] = { .type = NLA_REJECT, 5792 .reject_message = 5793 "IFLA_INET6_RA_MTU can not be set" }, 5794 }; 5795 5796 static int check_addr_gen_mode(int mode) 5797 { 5798 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5799 mode != IN6_ADDR_GEN_MODE_NONE && 5800 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5801 mode != IN6_ADDR_GEN_MODE_RANDOM) 5802 return -EINVAL; 5803 return 1; 5804 } 5805 5806 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5807 int mode) 5808 { 5809 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5810 !idev->cnf.stable_secret.initialized && 5811 !net->ipv6.devconf_dflt->stable_secret.initialized) 5812 return -EINVAL; 5813 return 1; 5814 } 5815 5816 static int inet6_validate_link_af(const struct net_device *dev, 5817 const struct nlattr *nla, 5818 struct netlink_ext_ack *extack) 5819 { 5820 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5821 struct inet6_dev *idev = NULL; 5822 int err; 5823 5824 if (dev) { 5825 idev = __in6_dev_get(dev); 5826 if (!idev) 5827 return -EAFNOSUPPORT; 5828 } 5829 5830 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, 5831 inet6_af_policy, extack); 5832 if (err) 5833 return err; 5834 5835 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE]) 5836 return -EINVAL; 5837 5838 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5839 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5840 5841 if (check_addr_gen_mode(mode) < 0) 5842 return -EINVAL; 5843 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0) 5844 return -EINVAL; 5845 } 5846 5847 return 0; 5848 } 5849 5850 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla, 5851 struct netlink_ext_ack *extack) 5852 { 5853 struct inet6_dev *idev = __in6_dev_get(dev); 5854 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5855 int err; 5856 5857 if (!idev) 5858 return -EAFNOSUPPORT; 5859 5860 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 5861 return -EINVAL; 5862 5863 if (tb[IFLA_INET6_TOKEN]) { 5864 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]), 5865 extack); 5866 if (err) 5867 return err; 5868 } 5869 5870 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5871 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5872 5873 idev->cnf.addr_gen_mode = mode; 5874 } 5875 5876 return 0; 5877 } 5878 5879 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5880 u32 portid, u32 seq, int event, unsigned int flags) 5881 { 5882 struct net_device *dev = idev->dev; 5883 struct ifinfomsg *hdr; 5884 struct nlmsghdr *nlh; 5885 void *protoinfo; 5886 5887 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5888 if (!nlh) 5889 return -EMSGSIZE; 5890 5891 hdr = nlmsg_data(nlh); 5892 hdr->ifi_family = AF_INET6; 5893 hdr->__ifi_pad = 0; 5894 hdr->ifi_type = dev->type; 5895 hdr->ifi_index = dev->ifindex; 5896 hdr->ifi_flags = dev_get_flags(dev); 5897 hdr->ifi_change = 0; 5898 5899 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5900 (dev->addr_len && 5901 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5902 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5903 (dev->ifindex != dev_get_iflink(dev) && 5904 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5905 nla_put_u8(skb, IFLA_OPERSTATE, 5906 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5907 goto nla_put_failure; 5908 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO); 5909 if (!protoinfo) 5910 goto nla_put_failure; 5911 5912 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5913 goto nla_put_failure; 5914 5915 nla_nest_end(skb, protoinfo); 5916 nlmsg_end(skb, nlh); 5917 return 0; 5918 5919 nla_put_failure: 5920 nlmsg_cancel(skb, nlh); 5921 return -EMSGSIZE; 5922 } 5923 5924 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh, 5925 struct netlink_ext_ack *extack) 5926 { 5927 struct ifinfomsg *ifm; 5928 5929 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5930 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request"); 5931 return -EINVAL; 5932 } 5933 5934 if (nlmsg_attrlen(nlh, sizeof(*ifm))) { 5935 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header"); 5936 return -EINVAL; 5937 } 5938 5939 ifm = nlmsg_data(nlh); 5940 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || 5941 ifm->ifi_change || ifm->ifi_index) { 5942 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request"); 5943 return -EINVAL; 5944 } 5945 5946 return 0; 5947 } 5948 5949 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5950 { 5951 struct net *net = sock_net(skb->sk); 5952 int h, s_h; 5953 int idx = 0, s_idx; 5954 struct net_device *dev; 5955 struct inet6_dev *idev; 5956 struct hlist_head *head; 5957 5958 /* only requests using strict checking can pass data to 5959 * influence the dump 5960 */ 5961 if (cb->strict_check) { 5962 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack); 5963 5964 if (err < 0) 5965 return err; 5966 } 5967 5968 s_h = cb->args[0]; 5969 s_idx = cb->args[1]; 5970 5971 rcu_read_lock(); 5972 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5973 idx = 0; 5974 head = &net->dev_index_head[h]; 5975 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5976 if (idx < s_idx) 5977 goto cont; 5978 idev = __in6_dev_get(dev); 5979 if (!idev) 5980 goto cont; 5981 if (inet6_fill_ifinfo(skb, idev, 5982 NETLINK_CB(cb->skb).portid, 5983 cb->nlh->nlmsg_seq, 5984 RTM_NEWLINK, NLM_F_MULTI) < 0) 5985 goto out; 5986 cont: 5987 idx++; 5988 } 5989 } 5990 out: 5991 rcu_read_unlock(); 5992 cb->args[1] = idx; 5993 cb->args[0] = h; 5994 5995 return skb->len; 5996 } 5997 5998 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5999 { 6000 struct sk_buff *skb; 6001 struct net *net = dev_net(idev->dev); 6002 int err = -ENOBUFS; 6003 6004 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 6005 if (!skb) 6006 goto errout; 6007 6008 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 6009 if (err < 0) { 6010 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 6011 WARN_ON(err == -EMSGSIZE); 6012 kfree_skb(skb); 6013 goto errout; 6014 } 6015 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 6016 return; 6017 errout: 6018 if (err < 0) 6019 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 6020 } 6021 6022 static inline size_t inet6_prefix_nlmsg_size(void) 6023 { 6024 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 6025 + nla_total_size(sizeof(struct in6_addr)) 6026 + nla_total_size(sizeof(struct prefix_cacheinfo)); 6027 } 6028 6029 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 6030 struct prefix_info *pinfo, u32 portid, u32 seq, 6031 int event, unsigned int flags) 6032 { 6033 struct prefixmsg *pmsg; 6034 struct nlmsghdr *nlh; 6035 struct prefix_cacheinfo ci; 6036 6037 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 6038 if (!nlh) 6039 return -EMSGSIZE; 6040 6041 pmsg = nlmsg_data(nlh); 6042 pmsg->prefix_family = AF_INET6; 6043 pmsg->prefix_pad1 = 0; 6044 pmsg->prefix_pad2 = 0; 6045 pmsg->prefix_ifindex = idev->dev->ifindex; 6046 pmsg->prefix_len = pinfo->prefix_len; 6047 pmsg->prefix_type = pinfo->type; 6048 pmsg->prefix_pad3 = 0; 6049 pmsg->prefix_flags = 0; 6050 if (pinfo->onlink) 6051 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 6052 if (pinfo->autoconf) 6053 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 6054 6055 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 6056 goto nla_put_failure; 6057 ci.preferred_time = ntohl(pinfo->prefered); 6058 ci.valid_time = ntohl(pinfo->valid); 6059 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 6060 goto nla_put_failure; 6061 nlmsg_end(skb, nlh); 6062 return 0; 6063 6064 nla_put_failure: 6065 nlmsg_cancel(skb, nlh); 6066 return -EMSGSIZE; 6067 } 6068 6069 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 6070 struct prefix_info *pinfo) 6071 { 6072 struct sk_buff *skb; 6073 struct net *net = dev_net(idev->dev); 6074 int err = -ENOBUFS; 6075 6076 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 6077 if (!skb) 6078 goto errout; 6079 6080 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 6081 if (err < 0) { 6082 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 6083 WARN_ON(err == -EMSGSIZE); 6084 kfree_skb(skb); 6085 goto errout; 6086 } 6087 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 6088 return; 6089 errout: 6090 if (err < 0) 6091 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 6092 } 6093 6094 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6095 { 6096 struct net *net = dev_net(ifp->idev->dev); 6097 6098 if (event) 6099 ASSERT_RTNL(); 6100 6101 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 6102 6103 switch (event) { 6104 case RTM_NEWADDR: 6105 /* 6106 * If the address was optimistic we inserted the route at the 6107 * start of our DAD process, so we don't need to do it again. 6108 * If the device was taken down in the middle of the DAD 6109 * cycle there is a race where we could get here without a 6110 * host route, so nothing to insert. That will be fixed when 6111 * the device is brought up. 6112 */ 6113 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) { 6114 ip6_ins_rt(net, ifp->rt); 6115 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) { 6116 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n", 6117 &ifp->addr, ifp->idev->dev->name); 6118 } 6119 6120 if (ifp->idev->cnf.forwarding) 6121 addrconf_join_anycast(ifp); 6122 if (!ipv6_addr_any(&ifp->peer_addr)) 6123 addrconf_prefix_route(&ifp->peer_addr, 128, 6124 ifp->rt_priority, ifp->idev->dev, 6125 0, 0, GFP_ATOMIC); 6126 break; 6127 case RTM_DELADDR: 6128 if (ifp->idev->cnf.forwarding) 6129 addrconf_leave_anycast(ifp); 6130 addrconf_leave_solict(ifp->idev, &ifp->addr); 6131 if (!ipv6_addr_any(&ifp->peer_addr)) { 6132 struct fib6_info *rt; 6133 6134 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 6135 ifp->idev->dev, 0, 0, 6136 false); 6137 if (rt) 6138 ip6_del_rt(net, rt, false); 6139 } 6140 if (ifp->rt) { 6141 ip6_del_rt(net, ifp->rt, false); 6142 ifp->rt = NULL; 6143 } 6144 rt_genid_bump_ipv6(net); 6145 break; 6146 } 6147 atomic_inc(&net->ipv6.dev_addr_genid); 6148 } 6149 6150 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6151 { 6152 if (likely(ifp->idev->dead == 0)) 6153 __ipv6_ifa_notify(event, ifp); 6154 } 6155 6156 #ifdef CONFIG_SYSCTL 6157 6158 static int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 6159 void *buffer, size_t *lenp, loff_t *ppos) 6160 { 6161 int *valp = ctl->data; 6162 int val = *valp; 6163 loff_t pos = *ppos; 6164 struct ctl_table lctl; 6165 int ret; 6166 6167 /* 6168 * ctl->data points to idev->cnf.forwarding, we should 6169 * not modify it until we get the rtnl lock. 6170 */ 6171 lctl = *ctl; 6172 lctl.data = &val; 6173 6174 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6175 6176 if (write) 6177 ret = addrconf_fixup_forwarding(ctl, valp, val); 6178 if (ret) 6179 *ppos = pos; 6180 return ret; 6181 } 6182 6183 static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 6184 void *buffer, size_t *lenp, loff_t *ppos) 6185 { 6186 struct inet6_dev *idev = ctl->extra1; 6187 int min_mtu = IPV6_MIN_MTU; 6188 struct ctl_table lctl; 6189 6190 lctl = *ctl; 6191 lctl.extra1 = &min_mtu; 6192 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 6193 6194 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 6195 } 6196 6197 static void dev_disable_change(struct inet6_dev *idev) 6198 { 6199 struct netdev_notifier_info info; 6200 6201 if (!idev || !idev->dev) 6202 return; 6203 6204 netdev_notifier_info_init(&info, idev->dev); 6205 if (idev->cnf.disable_ipv6) 6206 addrconf_notify(NULL, NETDEV_DOWN, &info); 6207 else 6208 addrconf_notify(NULL, NETDEV_UP, &info); 6209 } 6210 6211 static void addrconf_disable_change(struct net *net, __s32 newf) 6212 { 6213 struct net_device *dev; 6214 struct inet6_dev *idev; 6215 6216 for_each_netdev(net, dev) { 6217 idev = __in6_dev_get(dev); 6218 if (idev) { 6219 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 6220 idev->cnf.disable_ipv6 = newf; 6221 if (changed) 6222 dev_disable_change(idev); 6223 } 6224 } 6225 } 6226 6227 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 6228 { 6229 struct net *net; 6230 int old; 6231 6232 if (!rtnl_trylock()) 6233 return restart_syscall(); 6234 6235 net = (struct net *)table->extra2; 6236 old = *p; 6237 *p = newf; 6238 6239 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 6240 rtnl_unlock(); 6241 return 0; 6242 } 6243 6244 if (p == &net->ipv6.devconf_all->disable_ipv6) { 6245 net->ipv6.devconf_dflt->disable_ipv6 = newf; 6246 addrconf_disable_change(net, newf); 6247 } else if ((!newf) ^ (!old)) 6248 dev_disable_change((struct inet6_dev *)table->extra1); 6249 6250 rtnl_unlock(); 6251 return 0; 6252 } 6253 6254 static int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 6255 void *buffer, size_t *lenp, loff_t *ppos) 6256 { 6257 int *valp = ctl->data; 6258 int val = *valp; 6259 loff_t pos = *ppos; 6260 struct ctl_table lctl; 6261 int ret; 6262 6263 /* 6264 * ctl->data points to idev->cnf.disable_ipv6, we should 6265 * not modify it until we get the rtnl lock. 6266 */ 6267 lctl = *ctl; 6268 lctl.data = &val; 6269 6270 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6271 6272 if (write) 6273 ret = addrconf_disable_ipv6(ctl, valp, val); 6274 if (ret) 6275 *ppos = pos; 6276 return ret; 6277 } 6278 6279 static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 6280 void *buffer, size_t *lenp, loff_t *ppos) 6281 { 6282 int *valp = ctl->data; 6283 int ret; 6284 int old, new; 6285 6286 old = *valp; 6287 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 6288 new = *valp; 6289 6290 if (write && old != new) { 6291 struct net *net = ctl->extra2; 6292 6293 if (!rtnl_trylock()) 6294 return restart_syscall(); 6295 6296 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 6297 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6298 NETCONFA_PROXY_NEIGH, 6299 NETCONFA_IFINDEX_DEFAULT, 6300 net->ipv6.devconf_dflt); 6301 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 6302 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6303 NETCONFA_PROXY_NEIGH, 6304 NETCONFA_IFINDEX_ALL, 6305 net->ipv6.devconf_all); 6306 else { 6307 struct inet6_dev *idev = ctl->extra1; 6308 6309 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6310 NETCONFA_PROXY_NEIGH, 6311 idev->dev->ifindex, 6312 &idev->cnf); 6313 } 6314 rtnl_unlock(); 6315 } 6316 6317 return ret; 6318 } 6319 6320 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 6321 void *buffer, size_t *lenp, 6322 loff_t *ppos) 6323 { 6324 int ret = 0; 6325 u32 new_val; 6326 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 6327 struct net *net = (struct net *)ctl->extra2; 6328 struct ctl_table tmp = { 6329 .data = &new_val, 6330 .maxlen = sizeof(new_val), 6331 .mode = ctl->mode, 6332 }; 6333 6334 if (!rtnl_trylock()) 6335 return restart_syscall(); 6336 6337 new_val = *((u32 *)ctl->data); 6338 6339 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos); 6340 if (ret != 0) 6341 goto out; 6342 6343 if (write) { 6344 if (check_addr_gen_mode(new_val) < 0) { 6345 ret = -EINVAL; 6346 goto out; 6347 } 6348 6349 if (idev) { 6350 if (check_stable_privacy(idev, net, new_val) < 0) { 6351 ret = -EINVAL; 6352 goto out; 6353 } 6354 6355 if (idev->cnf.addr_gen_mode != new_val) { 6356 idev->cnf.addr_gen_mode = new_val; 6357 addrconf_dev_config(idev->dev); 6358 } 6359 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) { 6360 struct net_device *dev; 6361 6362 net->ipv6.devconf_dflt->addr_gen_mode = new_val; 6363 for_each_netdev(net, dev) { 6364 idev = __in6_dev_get(dev); 6365 if (idev && 6366 idev->cnf.addr_gen_mode != new_val) { 6367 idev->cnf.addr_gen_mode = new_val; 6368 addrconf_dev_config(idev->dev); 6369 } 6370 } 6371 } 6372 6373 *((u32 *)ctl->data) = new_val; 6374 } 6375 6376 out: 6377 rtnl_unlock(); 6378 6379 return ret; 6380 } 6381 6382 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 6383 void *buffer, size_t *lenp, 6384 loff_t *ppos) 6385 { 6386 int err; 6387 struct in6_addr addr; 6388 char str[IPV6_MAX_STRLEN]; 6389 struct ctl_table lctl = *ctl; 6390 struct net *net = ctl->extra2; 6391 struct ipv6_stable_secret *secret = ctl->data; 6392 6393 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 6394 return -EIO; 6395 6396 lctl.maxlen = IPV6_MAX_STRLEN; 6397 lctl.data = str; 6398 6399 if (!rtnl_trylock()) 6400 return restart_syscall(); 6401 6402 if (!write && !secret->initialized) { 6403 err = -EIO; 6404 goto out; 6405 } 6406 6407 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 6408 if (err >= sizeof(str)) { 6409 err = -EIO; 6410 goto out; 6411 } 6412 6413 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 6414 if (err || !write) 6415 goto out; 6416 6417 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 6418 err = -EIO; 6419 goto out; 6420 } 6421 6422 secret->initialized = true; 6423 secret->secret = addr; 6424 6425 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 6426 struct net_device *dev; 6427 6428 for_each_netdev(net, dev) { 6429 struct inet6_dev *idev = __in6_dev_get(dev); 6430 6431 if (idev) { 6432 idev->cnf.addr_gen_mode = 6433 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6434 } 6435 } 6436 } else { 6437 struct inet6_dev *idev = ctl->extra1; 6438 6439 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6440 } 6441 6442 out: 6443 rtnl_unlock(); 6444 6445 return err; 6446 } 6447 6448 static 6449 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 6450 int write, void *buffer, 6451 size_t *lenp, 6452 loff_t *ppos) 6453 { 6454 int *valp = ctl->data; 6455 int val = *valp; 6456 loff_t pos = *ppos; 6457 struct ctl_table lctl; 6458 int ret; 6459 6460 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 6461 * we should not modify it until we get the rtnl lock. 6462 */ 6463 lctl = *ctl; 6464 lctl.data = &val; 6465 6466 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6467 6468 if (write) 6469 ret = addrconf_fixup_linkdown(ctl, valp, val); 6470 if (ret) 6471 *ppos = pos; 6472 return ret; 6473 } 6474 6475 static 6476 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 6477 { 6478 if (rt) { 6479 if (action) 6480 rt->dst.flags |= DST_NOPOLICY; 6481 else 6482 rt->dst.flags &= ~DST_NOPOLICY; 6483 } 6484 } 6485 6486 static 6487 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 6488 { 6489 struct inet6_ifaddr *ifa; 6490 6491 read_lock_bh(&idev->lock); 6492 list_for_each_entry(ifa, &idev->addr_list, if_list) { 6493 spin_lock(&ifa->lock); 6494 if (ifa->rt) { 6495 /* host routes only use builtin fib6_nh */ 6496 struct fib6_nh *nh = ifa->rt->fib6_nh; 6497 int cpu; 6498 6499 rcu_read_lock(); 6500 ifa->rt->dst_nopolicy = val ? true : false; 6501 if (nh->rt6i_pcpu) { 6502 for_each_possible_cpu(cpu) { 6503 struct rt6_info **rtp; 6504 6505 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu); 6506 addrconf_set_nopolicy(*rtp, val); 6507 } 6508 } 6509 rcu_read_unlock(); 6510 } 6511 spin_unlock(&ifa->lock); 6512 } 6513 read_unlock_bh(&idev->lock); 6514 } 6515 6516 static 6517 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 6518 { 6519 struct inet6_dev *idev; 6520 struct net *net; 6521 6522 if (!rtnl_trylock()) 6523 return restart_syscall(); 6524 6525 *valp = val; 6526 6527 net = (struct net *)ctl->extra2; 6528 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 6529 rtnl_unlock(); 6530 return 0; 6531 } 6532 6533 if (valp == &net->ipv6.devconf_all->disable_policy) { 6534 struct net_device *dev; 6535 6536 for_each_netdev(net, dev) { 6537 idev = __in6_dev_get(dev); 6538 if (idev) 6539 addrconf_disable_policy_idev(idev, val); 6540 } 6541 } else { 6542 idev = (struct inet6_dev *)ctl->extra1; 6543 addrconf_disable_policy_idev(idev, val); 6544 } 6545 6546 rtnl_unlock(); 6547 return 0; 6548 } 6549 6550 static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 6551 void *buffer, size_t *lenp, loff_t *ppos) 6552 { 6553 int *valp = ctl->data; 6554 int val = *valp; 6555 loff_t pos = *ppos; 6556 struct ctl_table lctl; 6557 int ret; 6558 6559 lctl = *ctl; 6560 lctl.data = &val; 6561 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6562 6563 if (write && (*valp != val)) 6564 ret = addrconf_disable_policy(ctl, valp, val); 6565 6566 if (ret) 6567 *ppos = pos; 6568 6569 return ret; 6570 } 6571 6572 static int minus_one = -1; 6573 static const int two_five_five = 255; 6574 static u32 ioam6_if_id_max = U16_MAX; 6575 6576 static const struct ctl_table addrconf_sysctl[] = { 6577 { 6578 .procname = "forwarding", 6579 .data = &ipv6_devconf.forwarding, 6580 .maxlen = sizeof(int), 6581 .mode = 0644, 6582 .proc_handler = addrconf_sysctl_forward, 6583 }, 6584 { 6585 .procname = "hop_limit", 6586 .data = &ipv6_devconf.hop_limit, 6587 .maxlen = sizeof(int), 6588 .mode = 0644, 6589 .proc_handler = proc_dointvec_minmax, 6590 .extra1 = (void *)SYSCTL_ONE, 6591 .extra2 = (void *)&two_five_five, 6592 }, 6593 { 6594 .procname = "mtu", 6595 .data = &ipv6_devconf.mtu6, 6596 .maxlen = sizeof(int), 6597 .mode = 0644, 6598 .proc_handler = addrconf_sysctl_mtu, 6599 }, 6600 { 6601 .procname = "accept_ra", 6602 .data = &ipv6_devconf.accept_ra, 6603 .maxlen = sizeof(int), 6604 .mode = 0644, 6605 .proc_handler = proc_dointvec, 6606 }, 6607 { 6608 .procname = "accept_redirects", 6609 .data = &ipv6_devconf.accept_redirects, 6610 .maxlen = sizeof(int), 6611 .mode = 0644, 6612 .proc_handler = proc_dointvec, 6613 }, 6614 { 6615 .procname = "autoconf", 6616 .data = &ipv6_devconf.autoconf, 6617 .maxlen = sizeof(int), 6618 .mode = 0644, 6619 .proc_handler = proc_dointvec, 6620 }, 6621 { 6622 .procname = "dad_transmits", 6623 .data = &ipv6_devconf.dad_transmits, 6624 .maxlen = sizeof(int), 6625 .mode = 0644, 6626 .proc_handler = proc_dointvec, 6627 }, 6628 { 6629 .procname = "router_solicitations", 6630 .data = &ipv6_devconf.rtr_solicits, 6631 .maxlen = sizeof(int), 6632 .mode = 0644, 6633 .proc_handler = proc_dointvec_minmax, 6634 .extra1 = &minus_one, 6635 }, 6636 { 6637 .procname = "router_solicitation_interval", 6638 .data = &ipv6_devconf.rtr_solicit_interval, 6639 .maxlen = sizeof(int), 6640 .mode = 0644, 6641 .proc_handler = proc_dointvec_jiffies, 6642 }, 6643 { 6644 .procname = "router_solicitation_max_interval", 6645 .data = &ipv6_devconf.rtr_solicit_max_interval, 6646 .maxlen = sizeof(int), 6647 .mode = 0644, 6648 .proc_handler = proc_dointvec_jiffies, 6649 }, 6650 { 6651 .procname = "router_solicitation_delay", 6652 .data = &ipv6_devconf.rtr_solicit_delay, 6653 .maxlen = sizeof(int), 6654 .mode = 0644, 6655 .proc_handler = proc_dointvec_jiffies, 6656 }, 6657 { 6658 .procname = "force_mld_version", 6659 .data = &ipv6_devconf.force_mld_version, 6660 .maxlen = sizeof(int), 6661 .mode = 0644, 6662 .proc_handler = proc_dointvec, 6663 }, 6664 { 6665 .procname = "mldv1_unsolicited_report_interval", 6666 .data = 6667 &ipv6_devconf.mldv1_unsolicited_report_interval, 6668 .maxlen = sizeof(int), 6669 .mode = 0644, 6670 .proc_handler = proc_dointvec_ms_jiffies, 6671 }, 6672 { 6673 .procname = "mldv2_unsolicited_report_interval", 6674 .data = 6675 &ipv6_devconf.mldv2_unsolicited_report_interval, 6676 .maxlen = sizeof(int), 6677 .mode = 0644, 6678 .proc_handler = proc_dointvec_ms_jiffies, 6679 }, 6680 { 6681 .procname = "use_tempaddr", 6682 .data = &ipv6_devconf.use_tempaddr, 6683 .maxlen = sizeof(int), 6684 .mode = 0644, 6685 .proc_handler = proc_dointvec, 6686 }, 6687 { 6688 .procname = "temp_valid_lft", 6689 .data = &ipv6_devconf.temp_valid_lft, 6690 .maxlen = sizeof(int), 6691 .mode = 0644, 6692 .proc_handler = proc_dointvec, 6693 }, 6694 { 6695 .procname = "temp_prefered_lft", 6696 .data = &ipv6_devconf.temp_prefered_lft, 6697 .maxlen = sizeof(int), 6698 .mode = 0644, 6699 .proc_handler = proc_dointvec, 6700 }, 6701 { 6702 .procname = "regen_max_retry", 6703 .data = &ipv6_devconf.regen_max_retry, 6704 .maxlen = sizeof(int), 6705 .mode = 0644, 6706 .proc_handler = proc_dointvec, 6707 }, 6708 { 6709 .procname = "max_desync_factor", 6710 .data = &ipv6_devconf.max_desync_factor, 6711 .maxlen = sizeof(int), 6712 .mode = 0644, 6713 .proc_handler = proc_dointvec, 6714 }, 6715 { 6716 .procname = "max_addresses", 6717 .data = &ipv6_devconf.max_addresses, 6718 .maxlen = sizeof(int), 6719 .mode = 0644, 6720 .proc_handler = proc_dointvec, 6721 }, 6722 { 6723 .procname = "accept_ra_defrtr", 6724 .data = &ipv6_devconf.accept_ra_defrtr, 6725 .maxlen = sizeof(int), 6726 .mode = 0644, 6727 .proc_handler = proc_dointvec, 6728 }, 6729 { 6730 .procname = "ra_defrtr_metric", 6731 .data = &ipv6_devconf.ra_defrtr_metric, 6732 .maxlen = sizeof(u32), 6733 .mode = 0644, 6734 .proc_handler = proc_douintvec_minmax, 6735 .extra1 = (void *)SYSCTL_ONE, 6736 }, 6737 { 6738 .procname = "accept_ra_min_hop_limit", 6739 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6740 .maxlen = sizeof(int), 6741 .mode = 0644, 6742 .proc_handler = proc_dointvec, 6743 }, 6744 { 6745 .procname = "accept_ra_pinfo", 6746 .data = &ipv6_devconf.accept_ra_pinfo, 6747 .maxlen = sizeof(int), 6748 .mode = 0644, 6749 .proc_handler = proc_dointvec, 6750 }, 6751 #ifdef CONFIG_IPV6_ROUTER_PREF 6752 { 6753 .procname = "accept_ra_rtr_pref", 6754 .data = &ipv6_devconf.accept_ra_rtr_pref, 6755 .maxlen = sizeof(int), 6756 .mode = 0644, 6757 .proc_handler = proc_dointvec, 6758 }, 6759 { 6760 .procname = "router_probe_interval", 6761 .data = &ipv6_devconf.rtr_probe_interval, 6762 .maxlen = sizeof(int), 6763 .mode = 0644, 6764 .proc_handler = proc_dointvec_jiffies, 6765 }, 6766 #ifdef CONFIG_IPV6_ROUTE_INFO 6767 { 6768 .procname = "accept_ra_rt_info_min_plen", 6769 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6770 .maxlen = sizeof(int), 6771 .mode = 0644, 6772 .proc_handler = proc_dointvec, 6773 }, 6774 { 6775 .procname = "accept_ra_rt_info_max_plen", 6776 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6777 .maxlen = sizeof(int), 6778 .mode = 0644, 6779 .proc_handler = proc_dointvec, 6780 }, 6781 #endif 6782 #endif 6783 { 6784 .procname = "proxy_ndp", 6785 .data = &ipv6_devconf.proxy_ndp, 6786 .maxlen = sizeof(int), 6787 .mode = 0644, 6788 .proc_handler = addrconf_sysctl_proxy_ndp, 6789 }, 6790 { 6791 .procname = "accept_source_route", 6792 .data = &ipv6_devconf.accept_source_route, 6793 .maxlen = sizeof(int), 6794 .mode = 0644, 6795 .proc_handler = proc_dointvec, 6796 }, 6797 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6798 { 6799 .procname = "optimistic_dad", 6800 .data = &ipv6_devconf.optimistic_dad, 6801 .maxlen = sizeof(int), 6802 .mode = 0644, 6803 .proc_handler = proc_dointvec, 6804 }, 6805 { 6806 .procname = "use_optimistic", 6807 .data = &ipv6_devconf.use_optimistic, 6808 .maxlen = sizeof(int), 6809 .mode = 0644, 6810 .proc_handler = proc_dointvec, 6811 }, 6812 #endif 6813 #ifdef CONFIG_IPV6_MROUTE 6814 { 6815 .procname = "mc_forwarding", 6816 .data = &ipv6_devconf.mc_forwarding, 6817 .maxlen = sizeof(int), 6818 .mode = 0444, 6819 .proc_handler = proc_dointvec, 6820 }, 6821 #endif 6822 { 6823 .procname = "disable_ipv6", 6824 .data = &ipv6_devconf.disable_ipv6, 6825 .maxlen = sizeof(int), 6826 .mode = 0644, 6827 .proc_handler = addrconf_sysctl_disable, 6828 }, 6829 { 6830 .procname = "accept_dad", 6831 .data = &ipv6_devconf.accept_dad, 6832 .maxlen = sizeof(int), 6833 .mode = 0644, 6834 .proc_handler = proc_dointvec, 6835 }, 6836 { 6837 .procname = "force_tllao", 6838 .data = &ipv6_devconf.force_tllao, 6839 .maxlen = sizeof(int), 6840 .mode = 0644, 6841 .proc_handler = proc_dointvec 6842 }, 6843 { 6844 .procname = "ndisc_notify", 6845 .data = &ipv6_devconf.ndisc_notify, 6846 .maxlen = sizeof(int), 6847 .mode = 0644, 6848 .proc_handler = proc_dointvec 6849 }, 6850 { 6851 .procname = "suppress_frag_ndisc", 6852 .data = &ipv6_devconf.suppress_frag_ndisc, 6853 .maxlen = sizeof(int), 6854 .mode = 0644, 6855 .proc_handler = proc_dointvec 6856 }, 6857 { 6858 .procname = "accept_ra_from_local", 6859 .data = &ipv6_devconf.accept_ra_from_local, 6860 .maxlen = sizeof(int), 6861 .mode = 0644, 6862 .proc_handler = proc_dointvec, 6863 }, 6864 { 6865 .procname = "accept_ra_mtu", 6866 .data = &ipv6_devconf.accept_ra_mtu, 6867 .maxlen = sizeof(int), 6868 .mode = 0644, 6869 .proc_handler = proc_dointvec, 6870 }, 6871 { 6872 .procname = "stable_secret", 6873 .data = &ipv6_devconf.stable_secret, 6874 .maxlen = IPV6_MAX_STRLEN, 6875 .mode = 0600, 6876 .proc_handler = addrconf_sysctl_stable_secret, 6877 }, 6878 { 6879 .procname = "use_oif_addrs_only", 6880 .data = &ipv6_devconf.use_oif_addrs_only, 6881 .maxlen = sizeof(int), 6882 .mode = 0644, 6883 .proc_handler = proc_dointvec, 6884 }, 6885 { 6886 .procname = "ignore_routes_with_linkdown", 6887 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6888 .maxlen = sizeof(int), 6889 .mode = 0644, 6890 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6891 }, 6892 { 6893 .procname = "drop_unicast_in_l2_multicast", 6894 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6895 .maxlen = sizeof(int), 6896 .mode = 0644, 6897 .proc_handler = proc_dointvec, 6898 }, 6899 { 6900 .procname = "drop_unsolicited_na", 6901 .data = &ipv6_devconf.drop_unsolicited_na, 6902 .maxlen = sizeof(int), 6903 .mode = 0644, 6904 .proc_handler = proc_dointvec, 6905 }, 6906 { 6907 .procname = "keep_addr_on_down", 6908 .data = &ipv6_devconf.keep_addr_on_down, 6909 .maxlen = sizeof(int), 6910 .mode = 0644, 6911 .proc_handler = proc_dointvec, 6912 6913 }, 6914 { 6915 .procname = "seg6_enabled", 6916 .data = &ipv6_devconf.seg6_enabled, 6917 .maxlen = sizeof(int), 6918 .mode = 0644, 6919 .proc_handler = proc_dointvec, 6920 }, 6921 #ifdef CONFIG_IPV6_SEG6_HMAC 6922 { 6923 .procname = "seg6_require_hmac", 6924 .data = &ipv6_devconf.seg6_require_hmac, 6925 .maxlen = sizeof(int), 6926 .mode = 0644, 6927 .proc_handler = proc_dointvec, 6928 }, 6929 #endif 6930 { 6931 .procname = "enhanced_dad", 6932 .data = &ipv6_devconf.enhanced_dad, 6933 .maxlen = sizeof(int), 6934 .mode = 0644, 6935 .proc_handler = proc_dointvec, 6936 }, 6937 { 6938 .procname = "addr_gen_mode", 6939 .data = &ipv6_devconf.addr_gen_mode, 6940 .maxlen = sizeof(int), 6941 .mode = 0644, 6942 .proc_handler = addrconf_sysctl_addr_gen_mode, 6943 }, 6944 { 6945 .procname = "disable_policy", 6946 .data = &ipv6_devconf.disable_policy, 6947 .maxlen = sizeof(int), 6948 .mode = 0644, 6949 .proc_handler = addrconf_sysctl_disable_policy, 6950 }, 6951 { 6952 .procname = "ndisc_tclass", 6953 .data = &ipv6_devconf.ndisc_tclass, 6954 .maxlen = sizeof(int), 6955 .mode = 0644, 6956 .proc_handler = proc_dointvec_minmax, 6957 .extra1 = (void *)SYSCTL_ZERO, 6958 .extra2 = (void *)&two_five_five, 6959 }, 6960 { 6961 .procname = "rpl_seg_enabled", 6962 .data = &ipv6_devconf.rpl_seg_enabled, 6963 .maxlen = sizeof(int), 6964 .mode = 0644, 6965 .proc_handler = proc_dointvec, 6966 }, 6967 { 6968 .procname = "ioam6_enabled", 6969 .data = &ipv6_devconf.ioam6_enabled, 6970 .maxlen = sizeof(u8), 6971 .mode = 0644, 6972 .proc_handler = proc_dou8vec_minmax, 6973 .extra1 = (void *)SYSCTL_ZERO, 6974 .extra2 = (void *)SYSCTL_ONE, 6975 }, 6976 { 6977 .procname = "ioam6_id", 6978 .data = &ipv6_devconf.ioam6_id, 6979 .maxlen = sizeof(u32), 6980 .mode = 0644, 6981 .proc_handler = proc_douintvec_minmax, 6982 .extra1 = (void *)SYSCTL_ZERO, 6983 .extra2 = (void *)&ioam6_if_id_max, 6984 }, 6985 { 6986 .procname = "ioam6_id_wide", 6987 .data = &ipv6_devconf.ioam6_id_wide, 6988 .maxlen = sizeof(u32), 6989 .mode = 0644, 6990 .proc_handler = proc_douintvec, 6991 }, 6992 { 6993 .procname = "ndisc_evict_nocarrier", 6994 .data = &ipv6_devconf.ndisc_evict_nocarrier, 6995 .maxlen = sizeof(u8), 6996 .mode = 0644, 6997 .proc_handler = proc_dou8vec_minmax, 6998 .extra1 = (void *)SYSCTL_ZERO, 6999 .extra2 = (void *)SYSCTL_ONE, 7000 }, 7001 { 7002 /* sentinel */ 7003 } 7004 }; 7005 7006 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 7007 struct inet6_dev *idev, struct ipv6_devconf *p) 7008 { 7009 int i, ifindex; 7010 struct ctl_table *table; 7011 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 7012 7013 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 7014 if (!table) 7015 goto out; 7016 7017 for (i = 0; table[i].data; i++) { 7018 table[i].data += (char *)p - (char *)&ipv6_devconf; 7019 /* If one of these is already set, then it is not safe to 7020 * overwrite either of them: this makes proc_dointvec_minmax 7021 * usable. 7022 */ 7023 if (!table[i].extra1 && !table[i].extra2) { 7024 table[i].extra1 = idev; /* embedded; no ref */ 7025 table[i].extra2 = net; 7026 } 7027 } 7028 7029 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 7030 7031 p->sysctl_header = register_net_sysctl(net, path, table); 7032 if (!p->sysctl_header) 7033 goto free; 7034 7035 if (!strcmp(dev_name, "all")) 7036 ifindex = NETCONFA_IFINDEX_ALL; 7037 else if (!strcmp(dev_name, "default")) 7038 ifindex = NETCONFA_IFINDEX_DEFAULT; 7039 else 7040 ifindex = idev->dev->ifindex; 7041 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 7042 ifindex, p); 7043 return 0; 7044 7045 free: 7046 kfree(table); 7047 out: 7048 return -ENOBUFS; 7049 } 7050 7051 static void __addrconf_sysctl_unregister(struct net *net, 7052 struct ipv6_devconf *p, int ifindex) 7053 { 7054 struct ctl_table *table; 7055 7056 if (!p->sysctl_header) 7057 return; 7058 7059 table = p->sysctl_header->ctl_table_arg; 7060 unregister_net_sysctl_table(p->sysctl_header); 7061 p->sysctl_header = NULL; 7062 kfree(table); 7063 7064 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 7065 } 7066 7067 static int addrconf_sysctl_register(struct inet6_dev *idev) 7068 { 7069 int err; 7070 7071 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 7072 return -EINVAL; 7073 7074 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 7075 &ndisc_ifinfo_sysctl_change); 7076 if (err) 7077 return err; 7078 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 7079 idev, &idev->cnf); 7080 if (err) 7081 neigh_sysctl_unregister(idev->nd_parms); 7082 7083 return err; 7084 } 7085 7086 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 7087 { 7088 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 7089 idev->dev->ifindex); 7090 neigh_sysctl_unregister(idev->nd_parms); 7091 } 7092 7093 7094 #endif 7095 7096 static int __net_init addrconf_init_net(struct net *net) 7097 { 7098 int err = -ENOMEM; 7099 struct ipv6_devconf *all, *dflt; 7100 7101 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 7102 if (!all) 7103 goto err_alloc_all; 7104 7105 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 7106 if (!dflt) 7107 goto err_alloc_dflt; 7108 7109 if (IS_ENABLED(CONFIG_SYSCTL) && 7110 !net_eq(net, &init_net)) { 7111 switch (sysctl_devconf_inherit_init_net) { 7112 case 1: /* copy from init_net */ 7113 memcpy(all, init_net.ipv6.devconf_all, 7114 sizeof(ipv6_devconf)); 7115 memcpy(dflt, init_net.ipv6.devconf_dflt, 7116 sizeof(ipv6_devconf_dflt)); 7117 break; 7118 case 3: /* copy from the current netns */ 7119 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all, 7120 sizeof(ipv6_devconf)); 7121 memcpy(dflt, 7122 current->nsproxy->net_ns->ipv6.devconf_dflt, 7123 sizeof(ipv6_devconf_dflt)); 7124 break; 7125 case 0: 7126 case 2: 7127 /* use compiled values */ 7128 break; 7129 } 7130 } 7131 7132 /* these will be inherited by all namespaces */ 7133 dflt->autoconf = ipv6_defaults.autoconf; 7134 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 7135 7136 dflt->stable_secret.initialized = false; 7137 all->stable_secret.initialized = false; 7138 7139 net->ipv6.devconf_all = all; 7140 net->ipv6.devconf_dflt = dflt; 7141 7142 #ifdef CONFIG_SYSCTL 7143 err = __addrconf_sysctl_register(net, "all", NULL, all); 7144 if (err < 0) 7145 goto err_reg_all; 7146 7147 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 7148 if (err < 0) 7149 goto err_reg_dflt; 7150 #endif 7151 return 0; 7152 7153 #ifdef CONFIG_SYSCTL 7154 err_reg_dflt: 7155 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 7156 err_reg_all: 7157 kfree(dflt); 7158 #endif 7159 err_alloc_dflt: 7160 kfree(all); 7161 err_alloc_all: 7162 return err; 7163 } 7164 7165 static void __net_exit addrconf_exit_net(struct net *net) 7166 { 7167 #ifdef CONFIG_SYSCTL 7168 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 7169 NETCONFA_IFINDEX_DEFAULT); 7170 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 7171 NETCONFA_IFINDEX_ALL); 7172 #endif 7173 kfree(net->ipv6.devconf_dflt); 7174 kfree(net->ipv6.devconf_all); 7175 } 7176 7177 static struct pernet_operations addrconf_ops = { 7178 .init = addrconf_init_net, 7179 .exit = addrconf_exit_net, 7180 }; 7181 7182 static struct rtnl_af_ops inet6_ops __read_mostly = { 7183 .family = AF_INET6, 7184 .fill_link_af = inet6_fill_link_af, 7185 .get_link_af_size = inet6_get_link_af_size, 7186 .validate_link_af = inet6_validate_link_af, 7187 .set_link_af = inet6_set_link_af, 7188 }; 7189 7190 /* 7191 * Init / cleanup code 7192 */ 7193 7194 int __init addrconf_init(void) 7195 { 7196 struct inet6_dev *idev; 7197 int i, err; 7198 7199 err = ipv6_addr_label_init(); 7200 if (err < 0) { 7201 pr_crit("%s: cannot initialize default policy table: %d\n", 7202 __func__, err); 7203 goto out; 7204 } 7205 7206 err = register_pernet_subsys(&addrconf_ops); 7207 if (err < 0) 7208 goto out_addrlabel; 7209 7210 addrconf_wq = create_workqueue("ipv6_addrconf"); 7211 if (!addrconf_wq) { 7212 err = -ENOMEM; 7213 goto out_nowq; 7214 } 7215 7216 /* The addrconf netdev notifier requires that loopback_dev 7217 * has it's ipv6 private information allocated and setup 7218 * before it can bring up and give link-local addresses 7219 * to other devices which are up. 7220 * 7221 * Unfortunately, loopback_dev is not necessarily the first 7222 * entry in the global dev_base list of net devices. In fact, 7223 * it is likely to be the very last entry on that list. 7224 * So this causes the notifier registry below to try and 7225 * give link-local addresses to all devices besides loopback_dev 7226 * first, then loopback_dev, which cases all the non-loopback_dev 7227 * devices to fail to get a link-local address. 7228 * 7229 * So, as a temporary fix, allocate the ipv6 structure for 7230 * loopback_dev first by hand. 7231 * Longer term, all of the dependencies ipv6 has upon the loopback 7232 * device and it being up should be removed. 7233 */ 7234 rtnl_lock(); 7235 idev = ipv6_add_dev(init_net.loopback_dev); 7236 rtnl_unlock(); 7237 if (IS_ERR(idev)) { 7238 err = PTR_ERR(idev); 7239 goto errlo; 7240 } 7241 7242 ip6_route_init_special_entries(); 7243 7244 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7245 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 7246 7247 register_netdevice_notifier(&ipv6_dev_notf); 7248 7249 addrconf_verify(); 7250 7251 rtnl_af_register(&inet6_ops); 7252 7253 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK, 7254 NULL, inet6_dump_ifinfo, 0); 7255 if (err < 0) 7256 goto errout; 7257 7258 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR, 7259 inet6_rtm_newaddr, NULL, 0); 7260 if (err < 0) 7261 goto errout; 7262 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR, 7263 inet6_rtm_deladdr, NULL, 0); 7264 if (err < 0) 7265 goto errout; 7266 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR, 7267 inet6_rtm_getaddr, inet6_dump_ifaddr, 7268 RTNL_FLAG_DOIT_UNLOCKED); 7269 if (err < 0) 7270 goto errout; 7271 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST, 7272 NULL, inet6_dump_ifmcaddr, 0); 7273 if (err < 0) 7274 goto errout; 7275 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST, 7276 NULL, inet6_dump_ifacaddr, 0); 7277 if (err < 0) 7278 goto errout; 7279 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF, 7280 inet6_netconf_get_devconf, 7281 inet6_netconf_dump_devconf, 7282 RTNL_FLAG_DOIT_UNLOCKED); 7283 if (err < 0) 7284 goto errout; 7285 err = ipv6_addr_label_rtnl_register(); 7286 if (err < 0) 7287 goto errout; 7288 7289 return 0; 7290 errout: 7291 rtnl_unregister_all(PF_INET6); 7292 rtnl_af_unregister(&inet6_ops); 7293 unregister_netdevice_notifier(&ipv6_dev_notf); 7294 errlo: 7295 destroy_workqueue(addrconf_wq); 7296 out_nowq: 7297 unregister_pernet_subsys(&addrconf_ops); 7298 out_addrlabel: 7299 ipv6_addr_label_cleanup(); 7300 out: 7301 return err; 7302 } 7303 7304 void addrconf_cleanup(void) 7305 { 7306 struct net_device *dev; 7307 int i; 7308 7309 unregister_netdevice_notifier(&ipv6_dev_notf); 7310 unregister_pernet_subsys(&addrconf_ops); 7311 ipv6_addr_label_cleanup(); 7312 7313 rtnl_af_unregister(&inet6_ops); 7314 7315 rtnl_lock(); 7316 7317 /* clean dev list */ 7318 for_each_netdev(&init_net, dev) { 7319 if (__in6_dev_get(dev) == NULL) 7320 continue; 7321 addrconf_ifdown(dev, true); 7322 } 7323 addrconf_ifdown(init_net.loopback_dev, true); 7324 7325 /* 7326 * Check hash table. 7327 */ 7328 spin_lock_bh(&addrconf_hash_lock); 7329 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7330 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 7331 spin_unlock_bh(&addrconf_hash_lock); 7332 cancel_delayed_work(&addr_chk_work); 7333 rtnl_unlock(); 7334 7335 destroy_workqueue(addrconf_wq); 7336 } 7337