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 = get_random_u32_inclusive(900000, 1100000) * (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 = get_random_u32_inclusive(1900000, 2100000) * (u64)rt; 116 do_div(tmp, 1000000); 117 if ((s32)tmp > mrt) { 118 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */ 119 tmp = get_random_u32_inclusive(900000, 1100000) * (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 static void addrconf_verify(struct net *net); 151 static void addrconf_verify_rtnl(struct net *net); 152 153 static struct workqueue_struct *addrconf_wq; 154 155 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 156 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 157 158 static void addrconf_type_change(struct net_device *dev, 159 unsigned long event); 160 static int addrconf_ifdown(struct net_device *dev, bool unregister); 161 162 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 163 int plen, 164 const struct net_device *dev, 165 u32 flags, u32 noflags, 166 bool no_gw); 167 168 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 169 static void addrconf_dad_work(struct work_struct *w); 170 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 171 bool send_na); 172 static void addrconf_dad_run(struct inet6_dev *idev, bool restart); 173 static void addrconf_rs_timer(struct timer_list *t); 174 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 175 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 176 177 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 178 struct prefix_info *pinfo); 179 180 static struct ipv6_devconf ipv6_devconf __read_mostly = { 181 .forwarding = 0, 182 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 183 .mtu6 = IPV6_MIN_MTU, 184 .accept_ra = 1, 185 .accept_redirects = 1, 186 .autoconf = 1, 187 .force_mld_version = 0, 188 .mldv1_unsolicited_report_interval = 10 * HZ, 189 .mldv2_unsolicited_report_interval = HZ, 190 .dad_transmits = 1, 191 .rtr_solicits = MAX_RTR_SOLICITATIONS, 192 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 193 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 194 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 195 .use_tempaddr = 0, 196 .temp_valid_lft = TEMP_VALID_LIFETIME, 197 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 198 .regen_max_retry = REGEN_MAX_RETRY, 199 .max_desync_factor = MAX_DESYNC_FACTOR, 200 .max_addresses = IPV6_MAX_ADDRESSES, 201 .accept_ra_defrtr = 1, 202 .ra_defrtr_metric = IP6_RT_PRIO_USER, 203 .accept_ra_from_local = 0, 204 .accept_ra_min_hop_limit= 1, 205 .accept_ra_min_lft = 0, 206 .accept_ra_pinfo = 1, 207 #ifdef CONFIG_IPV6_ROUTER_PREF 208 .accept_ra_rtr_pref = 1, 209 .rtr_probe_interval = 60 * HZ, 210 #ifdef CONFIG_IPV6_ROUTE_INFO 211 .accept_ra_rt_info_min_plen = 0, 212 .accept_ra_rt_info_max_plen = 0, 213 #endif 214 #endif 215 .proxy_ndp = 0, 216 .accept_source_route = 0, /* we do not accept RH0 by default. */ 217 .disable_ipv6 = 0, 218 .accept_dad = 0, 219 .suppress_frag_ndisc = 1, 220 .accept_ra_mtu = 1, 221 .stable_secret = { 222 .initialized = false, 223 }, 224 .use_oif_addrs_only = 0, 225 .ignore_routes_with_linkdown = 0, 226 .keep_addr_on_down = 0, 227 .seg6_enabled = 0, 228 #ifdef CONFIG_IPV6_SEG6_HMAC 229 .seg6_require_hmac = 0, 230 #endif 231 .enhanced_dad = 1, 232 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 233 .disable_policy = 0, 234 .rpl_seg_enabled = 0, 235 .ioam6_enabled = 0, 236 .ioam6_id = IOAM6_DEFAULT_IF_ID, 237 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE, 238 .ndisc_evict_nocarrier = 1, 239 .ra_honor_pio_life = 0, 240 }; 241 242 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 243 .forwarding = 0, 244 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 245 .mtu6 = IPV6_MIN_MTU, 246 .accept_ra = 1, 247 .accept_redirects = 1, 248 .autoconf = 1, 249 .force_mld_version = 0, 250 .mldv1_unsolicited_report_interval = 10 * HZ, 251 .mldv2_unsolicited_report_interval = HZ, 252 .dad_transmits = 1, 253 .rtr_solicits = MAX_RTR_SOLICITATIONS, 254 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 255 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 256 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 257 .use_tempaddr = 0, 258 .temp_valid_lft = TEMP_VALID_LIFETIME, 259 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 260 .regen_max_retry = REGEN_MAX_RETRY, 261 .max_desync_factor = MAX_DESYNC_FACTOR, 262 .max_addresses = IPV6_MAX_ADDRESSES, 263 .accept_ra_defrtr = 1, 264 .ra_defrtr_metric = IP6_RT_PRIO_USER, 265 .accept_ra_from_local = 0, 266 .accept_ra_min_hop_limit= 1, 267 .accept_ra_min_lft = 0, 268 .accept_ra_pinfo = 1, 269 #ifdef CONFIG_IPV6_ROUTER_PREF 270 .accept_ra_rtr_pref = 1, 271 .rtr_probe_interval = 60 * HZ, 272 #ifdef CONFIG_IPV6_ROUTE_INFO 273 .accept_ra_rt_info_min_plen = 0, 274 .accept_ra_rt_info_max_plen = 0, 275 #endif 276 #endif 277 .proxy_ndp = 0, 278 .accept_source_route = 0, /* we do not accept RH0 by default. */ 279 .disable_ipv6 = 0, 280 .accept_dad = 1, 281 .suppress_frag_ndisc = 1, 282 .accept_ra_mtu = 1, 283 .stable_secret = { 284 .initialized = false, 285 }, 286 .use_oif_addrs_only = 0, 287 .ignore_routes_with_linkdown = 0, 288 .keep_addr_on_down = 0, 289 .seg6_enabled = 0, 290 #ifdef CONFIG_IPV6_SEG6_HMAC 291 .seg6_require_hmac = 0, 292 #endif 293 .enhanced_dad = 1, 294 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 295 .disable_policy = 0, 296 .rpl_seg_enabled = 0, 297 .ioam6_enabled = 0, 298 .ioam6_id = IOAM6_DEFAULT_IF_ID, 299 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE, 300 .ndisc_evict_nocarrier = 1, 301 .ra_honor_pio_life = 0, 302 }; 303 304 /* Check if link is ready: is it up and is a valid qdisc available */ 305 static inline bool addrconf_link_ready(const struct net_device *dev) 306 { 307 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev); 308 } 309 310 static void addrconf_del_rs_timer(struct inet6_dev *idev) 311 { 312 if (del_timer(&idev->rs_timer)) 313 __in6_dev_put(idev); 314 } 315 316 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 317 { 318 if (cancel_delayed_work(&ifp->dad_work)) 319 __in6_ifa_put(ifp); 320 } 321 322 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 323 unsigned long when) 324 { 325 if (!mod_timer(&idev->rs_timer, jiffies + when)) 326 in6_dev_hold(idev); 327 } 328 329 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 330 unsigned long delay) 331 { 332 in6_ifa_hold(ifp); 333 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay)) 334 in6_ifa_put(ifp); 335 } 336 337 static int snmp6_alloc_dev(struct inet6_dev *idev) 338 { 339 int i; 340 341 idev->stats.ipv6 = alloc_percpu_gfp(struct ipstats_mib, GFP_KERNEL_ACCOUNT); 342 if (!idev->stats.ipv6) 343 goto err_ip; 344 345 for_each_possible_cpu(i) { 346 struct ipstats_mib *addrconf_stats; 347 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 348 u64_stats_init(&addrconf_stats->syncp); 349 } 350 351 352 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 353 GFP_KERNEL); 354 if (!idev->stats.icmpv6dev) 355 goto err_icmp; 356 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 357 GFP_KERNEL_ACCOUNT); 358 if (!idev->stats.icmpv6msgdev) 359 goto err_icmpmsg; 360 361 return 0; 362 363 err_icmpmsg: 364 kfree(idev->stats.icmpv6dev); 365 err_icmp: 366 free_percpu(idev->stats.ipv6); 367 err_ip: 368 return -ENOMEM; 369 } 370 371 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 372 { 373 struct inet6_dev *ndev; 374 int err = -ENOMEM; 375 376 ASSERT_RTNL(); 377 378 if (dev->mtu < IPV6_MIN_MTU && dev != blackhole_netdev) 379 return ERR_PTR(-EINVAL); 380 381 ndev = kzalloc(sizeof(*ndev), GFP_KERNEL_ACCOUNT); 382 if (!ndev) 383 return ERR_PTR(err); 384 385 rwlock_init(&ndev->lock); 386 ndev->dev = dev; 387 INIT_LIST_HEAD(&ndev->addr_list); 388 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0); 389 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 390 391 if (ndev->cnf.stable_secret.initialized) 392 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 393 394 ndev->cnf.mtu6 = dev->mtu; 395 ndev->ra_mtu = 0; 396 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 397 if (!ndev->nd_parms) { 398 kfree(ndev); 399 return ERR_PTR(err); 400 } 401 if (ndev->cnf.forwarding) 402 dev_disable_lro(dev); 403 /* We refer to the device */ 404 netdev_hold(dev, &ndev->dev_tracker, GFP_KERNEL); 405 406 if (snmp6_alloc_dev(ndev) < 0) { 407 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n", 408 __func__); 409 neigh_parms_release(&nd_tbl, ndev->nd_parms); 410 netdev_put(dev, &ndev->dev_tracker); 411 kfree(ndev); 412 return ERR_PTR(err); 413 } 414 415 if (dev != blackhole_netdev) { 416 if (snmp6_register_dev(ndev) < 0) { 417 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n", 418 __func__, dev->name); 419 goto err_release; 420 } 421 } 422 /* One reference from device. */ 423 refcount_set(&ndev->refcnt, 1); 424 425 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 426 ndev->cnf.accept_dad = -1; 427 428 #if IS_ENABLED(CONFIG_IPV6_SIT) 429 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 430 pr_info("%s: Disabled Multicast RS\n", dev->name); 431 ndev->cnf.rtr_solicits = 0; 432 } 433 #endif 434 435 INIT_LIST_HEAD(&ndev->tempaddr_list); 436 ndev->desync_factor = U32_MAX; 437 if ((dev->flags&IFF_LOOPBACK) || 438 dev->type == ARPHRD_TUNNEL || 439 dev->type == ARPHRD_TUNNEL6 || 440 dev->type == ARPHRD_SIT || 441 dev->type == ARPHRD_NONE) { 442 ndev->cnf.use_tempaddr = -1; 443 } 444 445 ndev->token = in6addr_any; 446 447 if (netif_running(dev) && addrconf_link_ready(dev)) 448 ndev->if_flags |= IF_READY; 449 450 ipv6_mc_init_dev(ndev); 451 ndev->tstamp = jiffies; 452 if (dev != blackhole_netdev) { 453 err = addrconf_sysctl_register(ndev); 454 if (err) { 455 ipv6_mc_destroy_dev(ndev); 456 snmp6_unregister_dev(ndev); 457 goto err_release; 458 } 459 } 460 /* protected by rtnl_lock */ 461 rcu_assign_pointer(dev->ip6_ptr, ndev); 462 463 if (dev != blackhole_netdev) { 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 atomic_read(&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 LIST_HEAD(tmp_addr_list); 804 805 if (!idev) 806 return; 807 dev = idev->dev; 808 if (idev->cnf.forwarding) 809 dev_disable_lro(dev); 810 if (dev->flags & IFF_MULTICAST) { 811 if (idev->cnf.forwarding) { 812 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 813 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 814 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 815 } else { 816 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 817 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 818 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 819 } 820 } 821 822 read_lock_bh(&idev->lock); 823 list_for_each_entry(ifa, &idev->addr_list, if_list) { 824 if (ifa->flags&IFA_F_TENTATIVE) 825 continue; 826 list_add_tail(&ifa->if_list_aux, &tmp_addr_list); 827 } 828 read_unlock_bh(&idev->lock); 829 830 while (!list_empty(&tmp_addr_list)) { 831 ifa = list_first_entry(&tmp_addr_list, 832 struct inet6_ifaddr, if_list_aux); 833 list_del(&ifa->if_list_aux); 834 if (idev->cnf.forwarding) 835 addrconf_join_anycast(ifa); 836 else 837 addrconf_leave_anycast(ifa); 838 } 839 840 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, 841 NETCONFA_FORWARDING, 842 dev->ifindex, &idev->cnf); 843 } 844 845 846 static void addrconf_forward_change(struct net *net, __s32 newf) 847 { 848 struct net_device *dev; 849 struct inet6_dev *idev; 850 851 for_each_netdev(net, dev) { 852 idev = __in6_dev_get(dev); 853 if (idev) { 854 int changed = (!idev->cnf.forwarding) ^ (!newf); 855 idev->cnf.forwarding = newf; 856 if (changed) 857 dev_forward_change(idev); 858 } 859 } 860 } 861 862 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 863 { 864 struct net *net; 865 int old; 866 867 if (!rtnl_trylock()) 868 return restart_syscall(); 869 870 net = (struct net *)table->extra2; 871 old = *p; 872 *p = newf; 873 874 if (p == &net->ipv6.devconf_dflt->forwarding) { 875 if ((!newf) ^ (!old)) 876 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 877 NETCONFA_FORWARDING, 878 NETCONFA_IFINDEX_DEFAULT, 879 net->ipv6.devconf_dflt); 880 rtnl_unlock(); 881 return 0; 882 } 883 884 if (p == &net->ipv6.devconf_all->forwarding) { 885 int old_dflt = net->ipv6.devconf_dflt->forwarding; 886 887 net->ipv6.devconf_dflt->forwarding = newf; 888 if ((!newf) ^ (!old_dflt)) 889 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 890 NETCONFA_FORWARDING, 891 NETCONFA_IFINDEX_DEFAULT, 892 net->ipv6.devconf_dflt); 893 894 addrconf_forward_change(net, newf); 895 if ((!newf) ^ (!old)) 896 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 897 NETCONFA_FORWARDING, 898 NETCONFA_IFINDEX_ALL, 899 net->ipv6.devconf_all); 900 } else if ((!newf) ^ (!old)) 901 dev_forward_change((struct inet6_dev *)table->extra1); 902 rtnl_unlock(); 903 904 if (newf) 905 rt6_purge_dflt_routers(net); 906 return 1; 907 } 908 909 static void addrconf_linkdown_change(struct net *net, __s32 newf) 910 { 911 struct net_device *dev; 912 struct inet6_dev *idev; 913 914 for_each_netdev(net, dev) { 915 idev = __in6_dev_get(dev); 916 if (idev) { 917 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 918 919 idev->cnf.ignore_routes_with_linkdown = newf; 920 if (changed) 921 inet6_netconf_notify_devconf(dev_net(dev), 922 RTM_NEWNETCONF, 923 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 924 dev->ifindex, 925 &idev->cnf); 926 } 927 } 928 } 929 930 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 931 { 932 struct net *net; 933 int old; 934 935 if (!rtnl_trylock()) 936 return restart_syscall(); 937 938 net = (struct net *)table->extra2; 939 old = *p; 940 *p = newf; 941 942 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 943 if ((!newf) ^ (!old)) 944 inet6_netconf_notify_devconf(net, 945 RTM_NEWNETCONF, 946 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 947 NETCONFA_IFINDEX_DEFAULT, 948 net->ipv6.devconf_dflt); 949 rtnl_unlock(); 950 return 0; 951 } 952 953 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 954 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 955 addrconf_linkdown_change(net, newf); 956 if ((!newf) ^ (!old)) 957 inet6_netconf_notify_devconf(net, 958 RTM_NEWNETCONF, 959 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 960 NETCONFA_IFINDEX_ALL, 961 net->ipv6.devconf_all); 962 } 963 rtnl_unlock(); 964 965 return 1; 966 } 967 968 #endif 969 970 /* Nobody refers to this ifaddr, destroy it */ 971 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 972 { 973 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 974 975 #ifdef NET_REFCNT_DEBUG 976 pr_debug("%s\n", __func__); 977 #endif 978 979 in6_dev_put(ifp->idev); 980 981 if (cancel_delayed_work(&ifp->dad_work)) 982 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 983 ifp); 984 985 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 986 pr_warn("Freeing alive inet6 address %p\n", ifp); 987 return; 988 } 989 990 kfree_rcu(ifp, rcu); 991 } 992 993 static void 994 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 995 { 996 struct list_head *p; 997 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 998 999 /* 1000 * Each device address list is sorted in order of scope - 1001 * global before linklocal. 1002 */ 1003 list_for_each(p, &idev->addr_list) { 1004 struct inet6_ifaddr *ifa 1005 = list_entry(p, struct inet6_ifaddr, if_list); 1006 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 1007 break; 1008 } 1009 1010 list_add_tail_rcu(&ifp->if_list, p); 1011 } 1012 1013 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr) 1014 { 1015 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net); 1016 1017 return hash_32(val, IN6_ADDR_HSIZE_SHIFT); 1018 } 1019 1020 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1021 struct net_device *dev, unsigned int hash) 1022 { 1023 struct inet6_ifaddr *ifp; 1024 1025 hlist_for_each_entry(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 1026 if (ipv6_addr_equal(&ifp->addr, addr)) { 1027 if (!dev || ifp->idev->dev == dev) 1028 return true; 1029 } 1030 } 1031 return false; 1032 } 1033 1034 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa) 1035 { 1036 struct net *net = dev_net(dev); 1037 unsigned int hash = inet6_addr_hash(net, &ifa->addr); 1038 int err = 0; 1039 1040 spin_lock_bh(&net->ipv6.addrconf_hash_lock); 1041 1042 /* Ignore adding duplicate addresses on an interface */ 1043 if (ipv6_chk_same_addr(net, &ifa->addr, dev, hash)) { 1044 netdev_dbg(dev, "ipv6_add_addr: already assigned\n"); 1045 err = -EEXIST; 1046 } else { 1047 hlist_add_head_rcu(&ifa->addr_lst, &net->ipv6.inet6_addr_lst[hash]); 1048 } 1049 1050 spin_unlock_bh(&net->ipv6.addrconf_hash_lock); 1051 1052 return err; 1053 } 1054 1055 /* On success it returns ifp with increased reference count */ 1056 1057 static struct inet6_ifaddr * 1058 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg, 1059 bool can_block, struct netlink_ext_ack *extack) 1060 { 1061 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC; 1062 int addr_type = ipv6_addr_type(cfg->pfx); 1063 struct net *net = dev_net(idev->dev); 1064 struct inet6_ifaddr *ifa = NULL; 1065 struct fib6_info *f6i = NULL; 1066 int err = 0; 1067 1068 if (addr_type == IPV6_ADDR_ANY) { 1069 NL_SET_ERR_MSG_MOD(extack, "Invalid address"); 1070 return ERR_PTR(-EADDRNOTAVAIL); 1071 } else if (addr_type & IPV6_ADDR_MULTICAST && 1072 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) { 1073 NL_SET_ERR_MSG_MOD(extack, "Cannot assign multicast address without \"IFA_F_MCAUTOJOIN\" flag"); 1074 return ERR_PTR(-EADDRNOTAVAIL); 1075 } else if (!(idev->dev->flags & IFF_LOOPBACK) && 1076 !netif_is_l3_master(idev->dev) && 1077 addr_type & IPV6_ADDR_LOOPBACK) { 1078 NL_SET_ERR_MSG_MOD(extack, "Cannot assign loopback address on this device"); 1079 return ERR_PTR(-EADDRNOTAVAIL); 1080 } 1081 1082 if (idev->dead) { 1083 NL_SET_ERR_MSG_MOD(extack, "device is going away"); 1084 err = -ENODEV; 1085 goto out; 1086 } 1087 1088 if (idev->cnf.disable_ipv6) { 1089 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device"); 1090 err = -EACCES; 1091 goto out; 1092 } 1093 1094 /* validator notifier needs to be blocking; 1095 * do not call in atomic context 1096 */ 1097 if (can_block) { 1098 struct in6_validator_info i6vi = { 1099 .i6vi_addr = *cfg->pfx, 1100 .i6vi_dev = idev, 1101 .extack = extack, 1102 }; 1103 1104 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi); 1105 err = notifier_to_errno(err); 1106 if (err < 0) 1107 goto out; 1108 } 1109 1110 ifa = kzalloc(sizeof(*ifa), gfp_flags | __GFP_ACCOUNT); 1111 if (!ifa) { 1112 err = -ENOBUFS; 1113 goto out; 1114 } 1115 1116 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags, extack); 1117 if (IS_ERR(f6i)) { 1118 err = PTR_ERR(f6i); 1119 f6i = NULL; 1120 goto out; 1121 } 1122 1123 neigh_parms_data_state_setall(idev->nd_parms); 1124 1125 ifa->addr = *cfg->pfx; 1126 if (cfg->peer_pfx) 1127 ifa->peer_addr = *cfg->peer_pfx; 1128 1129 spin_lock_init(&ifa->lock); 1130 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1131 INIT_HLIST_NODE(&ifa->addr_lst); 1132 ifa->scope = cfg->scope; 1133 ifa->prefix_len = cfg->plen; 1134 ifa->rt_priority = cfg->rt_priority; 1135 ifa->flags = cfg->ifa_flags; 1136 ifa->ifa_proto = cfg->ifa_proto; 1137 /* No need to add the TENTATIVE flag for addresses with NODAD */ 1138 if (!(cfg->ifa_flags & IFA_F_NODAD)) 1139 ifa->flags |= IFA_F_TENTATIVE; 1140 ifa->valid_lft = cfg->valid_lft; 1141 ifa->prefered_lft = cfg->preferred_lft; 1142 ifa->cstamp = ifa->tstamp = jiffies; 1143 ifa->tokenized = false; 1144 1145 ifa->rt = f6i; 1146 1147 ifa->idev = idev; 1148 in6_dev_hold(idev); 1149 1150 /* For caller */ 1151 refcount_set(&ifa->refcnt, 1); 1152 1153 rcu_read_lock(); 1154 1155 err = ipv6_add_addr_hash(idev->dev, ifa); 1156 if (err < 0) { 1157 rcu_read_unlock(); 1158 goto out; 1159 } 1160 1161 write_lock_bh(&idev->lock); 1162 1163 /* Add to inet6_dev unicast addr list. */ 1164 ipv6_link_dev_addr(idev, ifa); 1165 1166 if (ifa->flags&IFA_F_TEMPORARY) { 1167 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1168 in6_ifa_hold(ifa); 1169 } 1170 1171 in6_ifa_hold(ifa); 1172 write_unlock_bh(&idev->lock); 1173 1174 rcu_read_unlock(); 1175 1176 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1177 out: 1178 if (unlikely(err < 0)) { 1179 fib6_info_release(f6i); 1180 1181 if (ifa) { 1182 if (ifa->idev) 1183 in6_dev_put(ifa->idev); 1184 kfree(ifa); 1185 } 1186 ifa = ERR_PTR(err); 1187 } 1188 1189 return ifa; 1190 } 1191 1192 enum cleanup_prefix_rt_t { 1193 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1194 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1195 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1196 }; 1197 1198 /* 1199 * Check, whether the prefix for ifp would still need a prefix route 1200 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1201 * constants. 1202 * 1203 * 1) we don't purge prefix if address was not permanent. 1204 * prefix is managed by its own lifetime. 1205 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1206 * 3) if there are no addresses, delete prefix. 1207 * 4) if there are still other permanent address(es), 1208 * corresponding prefix is still permanent. 1209 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1210 * don't purge the prefix, assume user space is managing it. 1211 * 6) otherwise, update prefix lifetime to the 1212 * longest valid lifetime among the corresponding 1213 * addresses on the device. 1214 * Note: subsequent RA will update lifetime. 1215 **/ 1216 static enum cleanup_prefix_rt_t 1217 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1218 { 1219 struct inet6_ifaddr *ifa; 1220 struct inet6_dev *idev = ifp->idev; 1221 unsigned long lifetime; 1222 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1223 1224 *expires = jiffies; 1225 1226 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1227 if (ifa == ifp) 1228 continue; 1229 if (ifa->prefix_len != ifp->prefix_len || 1230 !ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1231 ifp->prefix_len)) 1232 continue; 1233 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1234 return CLEANUP_PREFIX_RT_NOP; 1235 1236 action = CLEANUP_PREFIX_RT_EXPIRE; 1237 1238 spin_lock(&ifa->lock); 1239 1240 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1241 /* 1242 * Note: Because this address is 1243 * not permanent, lifetime < 1244 * LONG_MAX / HZ here. 1245 */ 1246 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1247 *expires = ifa->tstamp + lifetime * HZ; 1248 spin_unlock(&ifa->lock); 1249 } 1250 1251 return action; 1252 } 1253 1254 static void 1255 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, 1256 bool del_rt, bool del_peer) 1257 { 1258 struct fib6_info *f6i; 1259 1260 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr, 1261 ifp->prefix_len, 1262 ifp->idev->dev, 0, RTF_DEFAULT, true); 1263 if (f6i) { 1264 if (del_rt) 1265 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 1266 else { 1267 if (!(f6i->fib6_flags & RTF_EXPIRES)) 1268 fib6_set_expires(f6i, expires); 1269 fib6_info_release(f6i); 1270 } 1271 } 1272 } 1273 1274 1275 /* This function wants to get referenced ifp and releases it before return */ 1276 1277 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1278 { 1279 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1280 struct net *net = dev_net(ifp->idev->dev); 1281 unsigned long expires; 1282 int state; 1283 1284 ASSERT_RTNL(); 1285 1286 spin_lock_bh(&ifp->lock); 1287 state = ifp->state; 1288 ifp->state = INET6_IFADDR_STATE_DEAD; 1289 spin_unlock_bh(&ifp->lock); 1290 1291 if (state == INET6_IFADDR_STATE_DEAD) 1292 goto out; 1293 1294 spin_lock_bh(&net->ipv6.addrconf_hash_lock); 1295 hlist_del_init_rcu(&ifp->addr_lst); 1296 spin_unlock_bh(&net->ipv6.addrconf_hash_lock); 1297 1298 write_lock_bh(&ifp->idev->lock); 1299 1300 if (ifp->flags&IFA_F_TEMPORARY) { 1301 list_del(&ifp->tmp_list); 1302 if (ifp->ifpub) { 1303 in6_ifa_put(ifp->ifpub); 1304 ifp->ifpub = NULL; 1305 } 1306 __in6_ifa_put(ifp); 1307 } 1308 1309 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1310 action = check_cleanup_prefix_route(ifp, &expires); 1311 1312 list_del_rcu(&ifp->if_list); 1313 __in6_ifa_put(ifp); 1314 1315 write_unlock_bh(&ifp->idev->lock); 1316 1317 addrconf_del_dad_work(ifp); 1318 1319 ipv6_ifa_notify(RTM_DELADDR, ifp); 1320 1321 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1322 1323 if (action != CLEANUP_PREFIX_RT_NOP) { 1324 cleanup_prefix_route(ifp, expires, 1325 action == CLEANUP_PREFIX_RT_DEL, false); 1326 } 1327 1328 /* clean up prefsrc entries */ 1329 rt6_remove_prefsrc(ifp); 1330 out: 1331 in6_ifa_put(ifp); 1332 } 1333 1334 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block) 1335 { 1336 struct inet6_dev *idev = ifp->idev; 1337 unsigned long tmp_tstamp, age; 1338 unsigned long regen_advance; 1339 unsigned long now = jiffies; 1340 s32 cnf_temp_preferred_lft; 1341 struct inet6_ifaddr *ift; 1342 struct ifa6_config cfg; 1343 long max_desync_factor; 1344 struct in6_addr addr; 1345 int ret = 0; 1346 1347 write_lock_bh(&idev->lock); 1348 1349 retry: 1350 in6_dev_hold(idev); 1351 if (idev->cnf.use_tempaddr <= 0) { 1352 write_unlock_bh(&idev->lock); 1353 pr_info("%s: use_tempaddr is disabled\n", __func__); 1354 in6_dev_put(idev); 1355 ret = -1; 1356 goto out; 1357 } 1358 spin_lock_bh(&ifp->lock); 1359 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1360 idev->cnf.use_tempaddr = -1; /*XXX*/ 1361 spin_unlock_bh(&ifp->lock); 1362 write_unlock_bh(&idev->lock); 1363 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1364 __func__); 1365 in6_dev_put(idev); 1366 ret = -1; 1367 goto out; 1368 } 1369 in6_ifa_hold(ifp); 1370 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1371 ipv6_gen_rnd_iid(&addr); 1372 1373 age = (now - ifp->tstamp) / HZ; 1374 1375 regen_advance = idev->cnf.regen_max_retry * 1376 idev->cnf.dad_transmits * 1377 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 1378 1379 /* recalculate max_desync_factor each time and update 1380 * idev->desync_factor if it's larger 1381 */ 1382 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1383 max_desync_factor = min_t(long, 1384 idev->cnf.max_desync_factor, 1385 cnf_temp_preferred_lft - regen_advance); 1386 1387 if (unlikely(idev->desync_factor > max_desync_factor)) { 1388 if (max_desync_factor > 0) { 1389 get_random_bytes(&idev->desync_factor, 1390 sizeof(idev->desync_factor)); 1391 idev->desync_factor %= max_desync_factor; 1392 } else { 1393 idev->desync_factor = 0; 1394 } 1395 } 1396 1397 memset(&cfg, 0, sizeof(cfg)); 1398 cfg.valid_lft = min_t(__u32, ifp->valid_lft, 1399 idev->cnf.temp_valid_lft + age); 1400 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor; 1401 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft); 1402 cfg.preferred_lft = min_t(__u32, cfg.valid_lft, cfg.preferred_lft); 1403 1404 cfg.plen = ifp->prefix_len; 1405 tmp_tstamp = ifp->tstamp; 1406 spin_unlock_bh(&ifp->lock); 1407 1408 write_unlock_bh(&idev->lock); 1409 1410 /* A temporary address is created only if this calculated Preferred 1411 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1412 * an implementation must not create a temporary address with a zero 1413 * Preferred Lifetime. 1414 * Use age calculation as in addrconf_verify to avoid unnecessary 1415 * temporary addresses being generated. 1416 */ 1417 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1418 if (cfg.preferred_lft <= regen_advance + age) { 1419 in6_ifa_put(ifp); 1420 in6_dev_put(idev); 1421 ret = -1; 1422 goto out; 1423 } 1424 1425 cfg.ifa_flags = IFA_F_TEMPORARY; 1426 /* set in addrconf_prefix_rcv() */ 1427 if (ifp->flags & IFA_F_OPTIMISTIC) 1428 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 1429 1430 cfg.pfx = &addr; 1431 cfg.scope = ipv6_addr_scope(cfg.pfx); 1432 1433 ift = ipv6_add_addr(idev, &cfg, block, NULL); 1434 if (IS_ERR(ift)) { 1435 in6_ifa_put(ifp); 1436 in6_dev_put(idev); 1437 pr_info("%s: retry temporary address regeneration\n", __func__); 1438 write_lock_bh(&idev->lock); 1439 goto retry; 1440 } 1441 1442 spin_lock_bh(&ift->lock); 1443 ift->ifpub = ifp; 1444 ift->cstamp = now; 1445 ift->tstamp = tmp_tstamp; 1446 spin_unlock_bh(&ift->lock); 1447 1448 addrconf_dad_start(ift); 1449 in6_ifa_put(ift); 1450 in6_dev_put(idev); 1451 out: 1452 return ret; 1453 } 1454 1455 /* 1456 * Choose an appropriate source address (RFC3484) 1457 */ 1458 enum { 1459 IPV6_SADDR_RULE_INIT = 0, 1460 IPV6_SADDR_RULE_LOCAL, 1461 IPV6_SADDR_RULE_SCOPE, 1462 IPV6_SADDR_RULE_PREFERRED, 1463 #ifdef CONFIG_IPV6_MIP6 1464 IPV6_SADDR_RULE_HOA, 1465 #endif 1466 IPV6_SADDR_RULE_OIF, 1467 IPV6_SADDR_RULE_LABEL, 1468 IPV6_SADDR_RULE_PRIVACY, 1469 IPV6_SADDR_RULE_ORCHID, 1470 IPV6_SADDR_RULE_PREFIX, 1471 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1472 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1473 #endif 1474 IPV6_SADDR_RULE_MAX 1475 }; 1476 1477 struct ipv6_saddr_score { 1478 int rule; 1479 int addr_type; 1480 struct inet6_ifaddr *ifa; 1481 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1482 int scopedist; 1483 int matchlen; 1484 }; 1485 1486 struct ipv6_saddr_dst { 1487 const struct in6_addr *addr; 1488 int ifindex; 1489 int scope; 1490 int label; 1491 unsigned int prefs; 1492 }; 1493 1494 static inline int ipv6_saddr_preferred(int type) 1495 { 1496 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1497 return 1; 1498 return 0; 1499 } 1500 1501 static bool ipv6_use_optimistic_addr(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 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic) 1510 return false; 1511 1512 return true; 1513 #else 1514 return false; 1515 #endif 1516 } 1517 1518 static bool ipv6_allow_optimistic_dad(struct net *net, 1519 struct inet6_dev *idev) 1520 { 1521 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1522 if (!idev) 1523 return false; 1524 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1525 return false; 1526 1527 return true; 1528 #else 1529 return false; 1530 #endif 1531 } 1532 1533 static int ipv6_get_saddr_eval(struct net *net, 1534 struct ipv6_saddr_score *score, 1535 struct ipv6_saddr_dst *dst, 1536 int i) 1537 { 1538 int ret; 1539 1540 if (i <= score->rule) { 1541 switch (i) { 1542 case IPV6_SADDR_RULE_SCOPE: 1543 ret = score->scopedist; 1544 break; 1545 case IPV6_SADDR_RULE_PREFIX: 1546 ret = score->matchlen; 1547 break; 1548 default: 1549 ret = !!test_bit(i, score->scorebits); 1550 } 1551 goto out; 1552 } 1553 1554 switch (i) { 1555 case IPV6_SADDR_RULE_INIT: 1556 /* Rule 0: remember if hiscore is not ready yet */ 1557 ret = !!score->ifa; 1558 break; 1559 case IPV6_SADDR_RULE_LOCAL: 1560 /* Rule 1: Prefer same address */ 1561 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1562 break; 1563 case IPV6_SADDR_RULE_SCOPE: 1564 /* Rule 2: Prefer appropriate scope 1565 * 1566 * ret 1567 * ^ 1568 * -1 | d 15 1569 * ---+--+-+---> scope 1570 * | 1571 * | d is scope of the destination. 1572 * B-d | \ 1573 * | \ <- smaller scope is better if 1574 * B-15 | \ if scope is enough for destination. 1575 * | ret = B - scope (-1 <= scope >= d <= 15). 1576 * d-C-1 | / 1577 * |/ <- greater is better 1578 * -C / if scope is not enough for destination. 1579 * /| ret = scope - C (-1 <= d < scope <= 15). 1580 * 1581 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1582 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1583 * Assume B = 0 and we get C > 29. 1584 */ 1585 ret = __ipv6_addr_src_scope(score->addr_type); 1586 if (ret >= dst->scope) 1587 ret = -ret; 1588 else 1589 ret -= 128; /* 30 is enough */ 1590 score->scopedist = ret; 1591 break; 1592 case IPV6_SADDR_RULE_PREFERRED: 1593 { 1594 /* Rule 3: Avoid deprecated and optimistic addresses */ 1595 u8 avoid = IFA_F_DEPRECATED; 1596 1597 if (!ipv6_use_optimistic_addr(net, score->ifa->idev)) 1598 avoid |= IFA_F_OPTIMISTIC; 1599 ret = ipv6_saddr_preferred(score->addr_type) || 1600 !(score->ifa->flags & avoid); 1601 break; 1602 } 1603 #ifdef CONFIG_IPV6_MIP6 1604 case IPV6_SADDR_RULE_HOA: 1605 { 1606 /* Rule 4: Prefer home address */ 1607 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1608 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1609 break; 1610 } 1611 #endif 1612 case IPV6_SADDR_RULE_OIF: 1613 /* Rule 5: Prefer outgoing interface */ 1614 ret = (!dst->ifindex || 1615 dst->ifindex == score->ifa->idev->dev->ifindex); 1616 break; 1617 case IPV6_SADDR_RULE_LABEL: 1618 /* Rule 6: Prefer matching label */ 1619 ret = ipv6_addr_label(net, 1620 &score->ifa->addr, score->addr_type, 1621 score->ifa->idev->dev->ifindex) == dst->label; 1622 break; 1623 case IPV6_SADDR_RULE_PRIVACY: 1624 { 1625 /* Rule 7: Prefer public address 1626 * Note: prefer temporary address if use_tempaddr >= 2 1627 */ 1628 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1629 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1630 score->ifa->idev->cnf.use_tempaddr >= 2; 1631 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1632 break; 1633 } 1634 case IPV6_SADDR_RULE_ORCHID: 1635 /* Rule 8-: Prefer ORCHID vs ORCHID or 1636 * non-ORCHID vs non-ORCHID 1637 */ 1638 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1639 ipv6_addr_orchid(dst->addr)); 1640 break; 1641 case IPV6_SADDR_RULE_PREFIX: 1642 /* Rule 8: Use longest matching prefix */ 1643 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1644 if (ret > score->ifa->prefix_len) 1645 ret = score->ifa->prefix_len; 1646 score->matchlen = ret; 1647 break; 1648 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1649 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1650 /* Optimistic addresses still have lower precedence than other 1651 * preferred addresses. 1652 */ 1653 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1654 break; 1655 #endif 1656 default: 1657 ret = 0; 1658 } 1659 1660 if (ret) 1661 __set_bit(i, score->scorebits); 1662 score->rule = i; 1663 out: 1664 return ret; 1665 } 1666 1667 static int __ipv6_dev_get_saddr(struct net *net, 1668 struct ipv6_saddr_dst *dst, 1669 struct inet6_dev *idev, 1670 struct ipv6_saddr_score *scores, 1671 int hiscore_idx) 1672 { 1673 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1674 1675 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) { 1676 int i; 1677 1678 /* 1679 * - Tentative Address (RFC2462 section 5.4) 1680 * - A tentative address is not considered 1681 * "assigned to an interface" in the traditional 1682 * sense, unless it is also flagged as optimistic. 1683 * - Candidate Source Address (section 4) 1684 * - In any case, anycast addresses, multicast 1685 * addresses, and the unspecified address MUST 1686 * NOT be included in a candidate set. 1687 */ 1688 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1689 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1690 continue; 1691 1692 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1693 1694 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1695 score->addr_type & IPV6_ADDR_MULTICAST)) { 1696 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1697 idev->dev->name); 1698 continue; 1699 } 1700 1701 score->rule = -1; 1702 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1703 1704 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1705 int minihiscore, miniscore; 1706 1707 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1708 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1709 1710 if (minihiscore > miniscore) { 1711 if (i == IPV6_SADDR_RULE_SCOPE && 1712 score->scopedist > 0) { 1713 /* 1714 * special case: 1715 * each remaining entry 1716 * has too small (not enough) 1717 * scope, because ifa entries 1718 * are sorted by their scope 1719 * values. 1720 */ 1721 goto out; 1722 } 1723 break; 1724 } else if (minihiscore < miniscore) { 1725 swap(hiscore, score); 1726 hiscore_idx = 1 - hiscore_idx; 1727 1728 /* restore our iterator */ 1729 score->ifa = hiscore->ifa; 1730 1731 break; 1732 } 1733 } 1734 } 1735 out: 1736 return hiscore_idx; 1737 } 1738 1739 static int ipv6_get_saddr_master(struct net *net, 1740 const struct net_device *dst_dev, 1741 const struct net_device *master, 1742 struct ipv6_saddr_dst *dst, 1743 struct ipv6_saddr_score *scores, 1744 int hiscore_idx) 1745 { 1746 struct inet6_dev *idev; 1747 1748 idev = __in6_dev_get(dst_dev); 1749 if (idev) 1750 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1751 scores, hiscore_idx); 1752 1753 idev = __in6_dev_get(master); 1754 if (idev) 1755 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1756 scores, hiscore_idx); 1757 1758 return hiscore_idx; 1759 } 1760 1761 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1762 const struct in6_addr *daddr, unsigned int prefs, 1763 struct in6_addr *saddr) 1764 { 1765 struct ipv6_saddr_score scores[2], *hiscore; 1766 struct ipv6_saddr_dst dst; 1767 struct inet6_dev *idev; 1768 struct net_device *dev; 1769 int dst_type; 1770 bool use_oif_addr = false; 1771 int hiscore_idx = 0; 1772 int ret = 0; 1773 1774 dst_type = __ipv6_addr_type(daddr); 1775 dst.addr = daddr; 1776 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1777 dst.scope = __ipv6_addr_src_scope(dst_type); 1778 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1779 dst.prefs = prefs; 1780 1781 scores[hiscore_idx].rule = -1; 1782 scores[hiscore_idx].ifa = NULL; 1783 1784 rcu_read_lock(); 1785 1786 /* Candidate Source Address (section 4) 1787 * - multicast and link-local destination address, 1788 * the set of candidate source address MUST only 1789 * include addresses assigned to interfaces 1790 * belonging to the same link as the outgoing 1791 * interface. 1792 * (- For site-local destination addresses, the 1793 * set of candidate source addresses MUST only 1794 * include addresses assigned to interfaces 1795 * belonging to the same site as the outgoing 1796 * interface.) 1797 * - "It is RECOMMENDED that the candidate source addresses 1798 * be the set of unicast addresses assigned to the 1799 * interface that will be used to send to the destination 1800 * (the 'outgoing' interface)." (RFC 6724) 1801 */ 1802 if (dst_dev) { 1803 idev = __in6_dev_get(dst_dev); 1804 if ((dst_type & IPV6_ADDR_MULTICAST) || 1805 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1806 (idev && idev->cnf.use_oif_addrs_only)) { 1807 use_oif_addr = true; 1808 } 1809 } 1810 1811 if (use_oif_addr) { 1812 if (idev) 1813 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1814 } else { 1815 const struct net_device *master; 1816 int master_idx = 0; 1817 1818 /* if dst_dev exists and is enslaved to an L3 device, then 1819 * prefer addresses from dst_dev and then the master over 1820 * any other enslaved devices in the L3 domain. 1821 */ 1822 master = l3mdev_master_dev_rcu(dst_dev); 1823 if (master) { 1824 master_idx = master->ifindex; 1825 1826 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1827 master, &dst, 1828 scores, hiscore_idx); 1829 1830 if (scores[hiscore_idx].ifa) 1831 goto out; 1832 } 1833 1834 for_each_netdev_rcu(net, dev) { 1835 /* only consider addresses on devices in the 1836 * same L3 domain 1837 */ 1838 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1839 continue; 1840 idev = __in6_dev_get(dev); 1841 if (!idev) 1842 continue; 1843 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1844 } 1845 } 1846 1847 out: 1848 hiscore = &scores[hiscore_idx]; 1849 if (!hiscore->ifa) 1850 ret = -EADDRNOTAVAIL; 1851 else 1852 *saddr = hiscore->ifa->addr; 1853 1854 rcu_read_unlock(); 1855 return ret; 1856 } 1857 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1858 1859 static int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1860 u32 banned_flags) 1861 { 1862 struct inet6_ifaddr *ifp; 1863 int err = -EADDRNOTAVAIL; 1864 1865 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1866 if (ifp->scope > IFA_LINK) 1867 break; 1868 if (ifp->scope == IFA_LINK && 1869 !(ifp->flags & banned_flags)) { 1870 *addr = ifp->addr; 1871 err = 0; 1872 break; 1873 } 1874 } 1875 return err; 1876 } 1877 1878 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1879 u32 banned_flags) 1880 { 1881 struct inet6_dev *idev; 1882 int err = -EADDRNOTAVAIL; 1883 1884 rcu_read_lock(); 1885 idev = __in6_dev_get(dev); 1886 if (idev) { 1887 read_lock_bh(&idev->lock); 1888 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1889 read_unlock_bh(&idev->lock); 1890 } 1891 rcu_read_unlock(); 1892 return err; 1893 } 1894 1895 static int ipv6_count_addresses(const struct inet6_dev *idev) 1896 { 1897 const struct inet6_ifaddr *ifp; 1898 int cnt = 0; 1899 1900 rcu_read_lock(); 1901 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list) 1902 cnt++; 1903 rcu_read_unlock(); 1904 return cnt; 1905 } 1906 1907 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1908 const struct net_device *dev, int strict) 1909 { 1910 return ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1911 strict, IFA_F_TENTATIVE); 1912 } 1913 EXPORT_SYMBOL(ipv6_chk_addr); 1914 1915 /* device argument is used to find the L3 domain of interest. If 1916 * skip_dev_check is set, then the ifp device is not checked against 1917 * the passed in dev argument. So the 2 cases for addresses checks are: 1918 * 1. does the address exist in the L3 domain that dev is part of 1919 * (skip_dev_check = true), or 1920 * 1921 * 2. does the address exist on the specific device 1922 * (skip_dev_check = false) 1923 */ 1924 static struct net_device * 1925 __ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1926 const struct net_device *dev, bool skip_dev_check, 1927 int strict, u32 banned_flags) 1928 { 1929 unsigned int hash = inet6_addr_hash(net, addr); 1930 struct net_device *l3mdev, *ndev; 1931 struct inet6_ifaddr *ifp; 1932 u32 ifp_flags; 1933 1934 rcu_read_lock(); 1935 1936 l3mdev = l3mdev_master_dev_rcu(dev); 1937 if (skip_dev_check) 1938 dev = NULL; 1939 1940 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 1941 ndev = ifp->idev->dev; 1942 1943 if (l3mdev_master_dev_rcu(ndev) != l3mdev) 1944 continue; 1945 1946 /* Decouple optimistic from tentative for evaluation here. 1947 * Ban optimistic addresses explicitly, when required. 1948 */ 1949 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1950 ? (ifp->flags&~IFA_F_TENTATIVE) 1951 : ifp->flags; 1952 if (ipv6_addr_equal(&ifp->addr, addr) && 1953 !(ifp_flags&banned_flags) && 1954 (!dev || ndev == dev || 1955 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1956 rcu_read_unlock(); 1957 return ndev; 1958 } 1959 } 1960 1961 rcu_read_unlock(); 1962 return NULL; 1963 } 1964 1965 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1966 const struct net_device *dev, bool skip_dev_check, 1967 int strict, u32 banned_flags) 1968 { 1969 return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check, 1970 strict, banned_flags) ? 1 : 0; 1971 } 1972 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1973 1974 1975 /* Compares an address/prefix_len with addresses on device @dev. 1976 * If one is found it returns true. 1977 */ 1978 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1979 const unsigned int prefix_len, struct net_device *dev) 1980 { 1981 const struct inet6_ifaddr *ifa; 1982 const struct inet6_dev *idev; 1983 bool ret = false; 1984 1985 rcu_read_lock(); 1986 idev = __in6_dev_get(dev); 1987 if (idev) { 1988 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1989 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1990 if (ret) 1991 break; 1992 } 1993 } 1994 rcu_read_unlock(); 1995 1996 return ret; 1997 } 1998 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1999 2000 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 2001 { 2002 const struct inet6_ifaddr *ifa; 2003 const struct inet6_dev *idev; 2004 int onlink; 2005 2006 onlink = 0; 2007 rcu_read_lock(); 2008 idev = __in6_dev_get(dev); 2009 if (idev) { 2010 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 2011 onlink = ipv6_prefix_equal(addr, &ifa->addr, 2012 ifa->prefix_len); 2013 if (onlink) 2014 break; 2015 } 2016 } 2017 rcu_read_unlock(); 2018 return onlink; 2019 } 2020 EXPORT_SYMBOL(ipv6_chk_prefix); 2021 2022 /** 2023 * ipv6_dev_find - find the first device with a given source address. 2024 * @net: the net namespace 2025 * @addr: the source address 2026 * @dev: used to find the L3 domain of interest 2027 * 2028 * The caller should be protected by RCU, or RTNL. 2029 */ 2030 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr, 2031 struct net_device *dev) 2032 { 2033 return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1, 2034 IFA_F_TENTATIVE); 2035 } 2036 EXPORT_SYMBOL(ipv6_dev_find); 2037 2038 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 2039 struct net_device *dev, int strict) 2040 { 2041 unsigned int hash = inet6_addr_hash(net, addr); 2042 struct inet6_ifaddr *ifp, *result = NULL; 2043 2044 rcu_read_lock(); 2045 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 2046 if (ipv6_addr_equal(&ifp->addr, addr)) { 2047 if (!dev || ifp->idev->dev == dev || 2048 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 2049 result = ifp; 2050 in6_ifa_hold(ifp); 2051 break; 2052 } 2053 } 2054 } 2055 rcu_read_unlock(); 2056 2057 return result; 2058 } 2059 2060 /* Gets referenced address, destroys ifaddr */ 2061 2062 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 2063 { 2064 if (dad_failed) 2065 ifp->flags |= IFA_F_DADFAILED; 2066 2067 if (ifp->flags&IFA_F_TEMPORARY) { 2068 struct inet6_ifaddr *ifpub; 2069 spin_lock_bh(&ifp->lock); 2070 ifpub = ifp->ifpub; 2071 if (ifpub) { 2072 in6_ifa_hold(ifpub); 2073 spin_unlock_bh(&ifp->lock); 2074 ipv6_create_tempaddr(ifpub, true); 2075 in6_ifa_put(ifpub); 2076 } else { 2077 spin_unlock_bh(&ifp->lock); 2078 } 2079 ipv6_del_addr(ifp); 2080 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) { 2081 spin_lock_bh(&ifp->lock); 2082 addrconf_del_dad_work(ifp); 2083 ifp->flags |= IFA_F_TENTATIVE; 2084 if (dad_failed) 2085 ifp->flags &= ~IFA_F_OPTIMISTIC; 2086 spin_unlock_bh(&ifp->lock); 2087 if (dad_failed) 2088 ipv6_ifa_notify(0, ifp); 2089 in6_ifa_put(ifp); 2090 } else { 2091 ipv6_del_addr(ifp); 2092 } 2093 } 2094 2095 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 2096 { 2097 int err = -ENOENT; 2098 2099 spin_lock_bh(&ifp->lock); 2100 if (ifp->state == INET6_IFADDR_STATE_DAD) { 2101 ifp->state = INET6_IFADDR_STATE_POSTDAD; 2102 err = 0; 2103 } 2104 spin_unlock_bh(&ifp->lock); 2105 2106 return err; 2107 } 2108 2109 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp) 2110 { 2111 struct inet6_dev *idev = ifp->idev; 2112 struct net *net = dev_net(idev->dev); 2113 2114 if (addrconf_dad_end(ifp)) { 2115 in6_ifa_put(ifp); 2116 return; 2117 } 2118 2119 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n", 2120 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source); 2121 2122 spin_lock_bh(&ifp->lock); 2123 2124 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 2125 struct in6_addr new_addr; 2126 struct inet6_ifaddr *ifp2; 2127 int retries = ifp->stable_privacy_retry + 1; 2128 struct ifa6_config cfg = { 2129 .pfx = &new_addr, 2130 .plen = ifp->prefix_len, 2131 .ifa_flags = ifp->flags, 2132 .valid_lft = ifp->valid_lft, 2133 .preferred_lft = ifp->prefered_lft, 2134 .scope = ifp->scope, 2135 }; 2136 2137 if (retries > net->ipv6.sysctl.idgen_retries) { 2138 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 2139 ifp->idev->dev->name); 2140 goto errdad; 2141 } 2142 2143 new_addr = ifp->addr; 2144 if (ipv6_generate_stable_address(&new_addr, retries, 2145 idev)) 2146 goto errdad; 2147 2148 spin_unlock_bh(&ifp->lock); 2149 2150 if (idev->cnf.max_addresses && 2151 ipv6_count_addresses(idev) >= 2152 idev->cnf.max_addresses) 2153 goto lock_errdad; 2154 2155 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 2156 ifp->idev->dev->name); 2157 2158 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL); 2159 if (IS_ERR(ifp2)) 2160 goto lock_errdad; 2161 2162 spin_lock_bh(&ifp2->lock); 2163 ifp2->stable_privacy_retry = retries; 2164 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2165 spin_unlock_bh(&ifp2->lock); 2166 2167 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2168 in6_ifa_put(ifp2); 2169 lock_errdad: 2170 spin_lock_bh(&ifp->lock); 2171 } 2172 2173 errdad: 2174 /* transition from _POSTDAD to _ERRDAD */ 2175 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2176 spin_unlock_bh(&ifp->lock); 2177 2178 addrconf_mod_dad_work(ifp, 0); 2179 in6_ifa_put(ifp); 2180 } 2181 2182 /* Join to solicited addr multicast group. 2183 * caller must hold RTNL */ 2184 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2185 { 2186 struct in6_addr maddr; 2187 2188 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2189 return; 2190 2191 addrconf_addr_solict_mult(addr, &maddr); 2192 ipv6_dev_mc_inc(dev, &maddr); 2193 } 2194 2195 /* caller must hold RTNL */ 2196 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2197 { 2198 struct in6_addr maddr; 2199 2200 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2201 return; 2202 2203 addrconf_addr_solict_mult(addr, &maddr); 2204 __ipv6_dev_mc_dec(idev, &maddr); 2205 } 2206 2207 /* caller must hold RTNL */ 2208 static void addrconf_join_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_inc(ifp->idev, &addr); 2218 } 2219 2220 /* caller must hold RTNL */ 2221 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2222 { 2223 struct in6_addr addr; 2224 2225 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2226 return; 2227 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2228 if (ipv6_addr_any(&addr)) 2229 return; 2230 __ipv6_dev_ac_dec(ifp->idev, &addr); 2231 } 2232 2233 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2234 { 2235 switch (dev->addr_len) { 2236 case ETH_ALEN: 2237 memcpy(eui, dev->dev_addr, 3); 2238 eui[3] = 0xFF; 2239 eui[4] = 0xFE; 2240 memcpy(eui + 5, dev->dev_addr + 3, 3); 2241 break; 2242 case EUI64_ADDR_LEN: 2243 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2244 eui[0] ^= 2; 2245 break; 2246 default: 2247 return -1; 2248 } 2249 2250 return 0; 2251 } 2252 2253 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2254 { 2255 const union fwnet_hwaddr *ha; 2256 2257 if (dev->addr_len != FWNET_ALEN) 2258 return -1; 2259 2260 ha = (const union fwnet_hwaddr *)dev->dev_addr; 2261 2262 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2263 eui[0] ^= 2; 2264 return 0; 2265 } 2266 2267 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2268 { 2269 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2270 if (dev->addr_len != ARCNET_ALEN) 2271 return -1; 2272 memset(eui, 0, 7); 2273 eui[7] = *(u8 *)dev->dev_addr; 2274 return 0; 2275 } 2276 2277 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2278 { 2279 if (dev->addr_len != INFINIBAND_ALEN) 2280 return -1; 2281 memcpy(eui, dev->dev_addr + 12, 8); 2282 eui[0] |= 2; 2283 return 0; 2284 } 2285 2286 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2287 { 2288 if (addr == 0) 2289 return -1; 2290 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2291 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2292 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2293 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2294 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2295 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2296 eui[1] = 0; 2297 eui[2] = 0x5E; 2298 eui[3] = 0xFE; 2299 memcpy(eui + 4, &addr, 4); 2300 return 0; 2301 } 2302 2303 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2304 { 2305 if (dev->priv_flags & IFF_ISATAP) 2306 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2307 return -1; 2308 } 2309 2310 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2311 { 2312 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2313 } 2314 2315 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2316 { 2317 memcpy(eui, dev->perm_addr, 3); 2318 memcpy(eui + 5, dev->perm_addr + 3, 3); 2319 eui[3] = 0xFF; 2320 eui[4] = 0xFE; 2321 eui[0] ^= 2; 2322 return 0; 2323 } 2324 2325 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2326 { 2327 switch (dev->type) { 2328 case ARPHRD_ETHER: 2329 case ARPHRD_FDDI: 2330 return addrconf_ifid_eui48(eui, dev); 2331 case ARPHRD_ARCNET: 2332 return addrconf_ifid_arcnet(eui, dev); 2333 case ARPHRD_INFINIBAND: 2334 return addrconf_ifid_infiniband(eui, dev); 2335 case ARPHRD_SIT: 2336 return addrconf_ifid_sit(eui, dev); 2337 case ARPHRD_IPGRE: 2338 case ARPHRD_TUNNEL: 2339 return addrconf_ifid_gre(eui, dev); 2340 case ARPHRD_6LOWPAN: 2341 return addrconf_ifid_6lowpan(eui, dev); 2342 case ARPHRD_IEEE1394: 2343 return addrconf_ifid_ieee1394(eui, dev); 2344 case ARPHRD_TUNNEL6: 2345 case ARPHRD_IP6GRE: 2346 case ARPHRD_RAWIP: 2347 return addrconf_ifid_ip6tnl(eui, dev); 2348 } 2349 return -1; 2350 } 2351 2352 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2353 { 2354 int err = -1; 2355 struct inet6_ifaddr *ifp; 2356 2357 read_lock_bh(&idev->lock); 2358 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2359 if (ifp->scope > IFA_LINK) 2360 break; 2361 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2362 memcpy(eui, ifp->addr.s6_addr+8, 8); 2363 err = 0; 2364 break; 2365 } 2366 } 2367 read_unlock_bh(&idev->lock); 2368 return err; 2369 } 2370 2371 /* Generation of a randomized Interface Identifier 2372 * draft-ietf-6man-rfc4941bis, Section 3.3.1 2373 */ 2374 2375 static void ipv6_gen_rnd_iid(struct in6_addr *addr) 2376 { 2377 regen: 2378 get_random_bytes(&addr->s6_addr[8], 8); 2379 2380 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1: 2381 * check if generated address is not inappropriate: 2382 * 2383 * - Reserved IPv6 Interface Identifiers 2384 * - XXX: already assigned to an address on the device 2385 */ 2386 2387 /* Subnet-router anycast: 0000:0000:0000:0000 */ 2388 if (!(addr->s6_addr32[2] | addr->s6_addr32[3])) 2389 goto regen; 2390 2391 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212 2392 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213 2393 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF 2394 */ 2395 if (ntohl(addr->s6_addr32[2]) == 0x02005eff && 2396 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000) 2397 goto regen; 2398 2399 /* Reserved subnet anycast addresses */ 2400 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff && 2401 ntohl(addr->s6_addr32[3]) >= 0Xffffff80) 2402 goto regen; 2403 } 2404 2405 /* 2406 * Add prefix route. 2407 */ 2408 2409 static void 2410 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric, 2411 struct net_device *dev, unsigned long expires, 2412 u32 flags, gfp_t gfp_flags) 2413 { 2414 struct fib6_config cfg = { 2415 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2416 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF, 2417 .fc_ifindex = dev->ifindex, 2418 .fc_expires = expires, 2419 .fc_dst_len = plen, 2420 .fc_flags = RTF_UP | flags, 2421 .fc_nlinfo.nl_net = dev_net(dev), 2422 .fc_protocol = RTPROT_KERNEL, 2423 .fc_type = RTN_UNICAST, 2424 }; 2425 2426 cfg.fc_dst = *pfx; 2427 2428 /* Prevent useless cloning on PtP SIT. 2429 This thing is done here expecting that the whole 2430 class of non-broadcast devices need not cloning. 2431 */ 2432 #if IS_ENABLED(CONFIG_IPV6_SIT) 2433 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2434 cfg.fc_flags |= RTF_NONEXTHOP; 2435 #endif 2436 2437 ip6_route_add(&cfg, gfp_flags, NULL); 2438 } 2439 2440 2441 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2442 int plen, 2443 const struct net_device *dev, 2444 u32 flags, u32 noflags, 2445 bool no_gw) 2446 { 2447 struct fib6_node *fn; 2448 struct fib6_info *rt = NULL; 2449 struct fib6_table *table; 2450 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2451 2452 table = fib6_get_table(dev_net(dev), tb_id); 2453 if (!table) 2454 return NULL; 2455 2456 rcu_read_lock(); 2457 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true); 2458 if (!fn) 2459 goto out; 2460 2461 for_each_fib6_node_rt_rcu(fn) { 2462 /* prefix routes only use builtin fib6_nh */ 2463 if (rt->nh) 2464 continue; 2465 2466 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex) 2467 continue; 2468 if (no_gw && rt->fib6_nh->fib_nh_gw_family) 2469 continue; 2470 if ((rt->fib6_flags & flags) != flags) 2471 continue; 2472 if ((rt->fib6_flags & noflags) != 0) 2473 continue; 2474 if (!fib6_info_hold_safe(rt)) 2475 continue; 2476 break; 2477 } 2478 out: 2479 rcu_read_unlock(); 2480 return rt; 2481 } 2482 2483 2484 /* Create "default" multicast route to the interface */ 2485 2486 static void addrconf_add_mroute(struct net_device *dev) 2487 { 2488 struct fib6_config cfg = { 2489 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2490 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2491 .fc_ifindex = dev->ifindex, 2492 .fc_dst_len = 8, 2493 .fc_flags = RTF_UP, 2494 .fc_type = RTN_MULTICAST, 2495 .fc_nlinfo.nl_net = dev_net(dev), 2496 .fc_protocol = RTPROT_KERNEL, 2497 }; 2498 2499 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2500 2501 ip6_route_add(&cfg, GFP_KERNEL, NULL); 2502 } 2503 2504 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2505 { 2506 struct inet6_dev *idev; 2507 2508 ASSERT_RTNL(); 2509 2510 idev = ipv6_find_idev(dev); 2511 if (IS_ERR(idev)) 2512 return idev; 2513 2514 if (idev->cnf.disable_ipv6) 2515 return ERR_PTR(-EACCES); 2516 2517 /* Add default multicast route */ 2518 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2519 addrconf_add_mroute(dev); 2520 2521 return idev; 2522 } 2523 2524 static void manage_tempaddrs(struct inet6_dev *idev, 2525 struct inet6_ifaddr *ifp, 2526 __u32 valid_lft, __u32 prefered_lft, 2527 bool create, unsigned long now) 2528 { 2529 u32 flags; 2530 struct inet6_ifaddr *ift; 2531 2532 read_lock_bh(&idev->lock); 2533 /* update all temporary addresses in the list */ 2534 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2535 int age, max_valid, max_prefered; 2536 2537 if (ifp != ift->ifpub) 2538 continue; 2539 2540 /* RFC 4941 section 3.3: 2541 * If a received option will extend the lifetime of a public 2542 * address, the lifetimes of temporary addresses should 2543 * be extended, subject to the overall constraint that no 2544 * temporary addresses should ever remain "valid" or "preferred" 2545 * for a time longer than (TEMP_VALID_LIFETIME) or 2546 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2547 */ 2548 age = (now - ift->cstamp) / HZ; 2549 max_valid = idev->cnf.temp_valid_lft - age; 2550 if (max_valid < 0) 2551 max_valid = 0; 2552 2553 max_prefered = idev->cnf.temp_prefered_lft - 2554 idev->desync_factor - age; 2555 if (max_prefered < 0) 2556 max_prefered = 0; 2557 2558 if (valid_lft > max_valid) 2559 valid_lft = max_valid; 2560 2561 if (prefered_lft > max_prefered) 2562 prefered_lft = max_prefered; 2563 2564 spin_lock(&ift->lock); 2565 flags = ift->flags; 2566 ift->valid_lft = valid_lft; 2567 ift->prefered_lft = prefered_lft; 2568 ift->tstamp = now; 2569 if (prefered_lft > 0) 2570 ift->flags &= ~IFA_F_DEPRECATED; 2571 2572 spin_unlock(&ift->lock); 2573 if (!(flags&IFA_F_TENTATIVE)) 2574 ipv6_ifa_notify(0, ift); 2575 } 2576 2577 /* Also create a temporary address if it's enabled but no temporary 2578 * address currently exists. 2579 * However, we get called with valid_lft == 0, prefered_lft == 0, create == false 2580 * as part of cleanup (ie. deleting the mngtmpaddr). 2581 * We don't want that to result in creating a new temporary ip address. 2582 */ 2583 if (list_empty(&idev->tempaddr_list) && (valid_lft || prefered_lft)) 2584 create = true; 2585 2586 if (create && idev->cnf.use_tempaddr > 0) { 2587 /* When a new public address is created as described 2588 * in [ADDRCONF], also create a new temporary address. 2589 */ 2590 read_unlock_bh(&idev->lock); 2591 ipv6_create_tempaddr(ifp, false); 2592 } else { 2593 read_unlock_bh(&idev->lock); 2594 } 2595 } 2596 2597 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2598 { 2599 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2600 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2601 } 2602 2603 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2604 const struct prefix_info *pinfo, 2605 struct inet6_dev *in6_dev, 2606 const struct in6_addr *addr, int addr_type, 2607 u32 addr_flags, bool sllao, bool tokenized, 2608 __u32 valid_lft, u32 prefered_lft) 2609 { 2610 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2611 int create = 0, update_lft = 0; 2612 2613 if (!ifp && valid_lft) { 2614 int max_addresses = in6_dev->cnf.max_addresses; 2615 struct ifa6_config cfg = { 2616 .pfx = addr, 2617 .plen = pinfo->prefix_len, 2618 .ifa_flags = addr_flags, 2619 .valid_lft = valid_lft, 2620 .preferred_lft = prefered_lft, 2621 .scope = addr_type & IPV6_ADDR_SCOPE_MASK, 2622 .ifa_proto = IFAPROT_KERNEL_RA 2623 }; 2624 2625 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2626 if ((net->ipv6.devconf_all->optimistic_dad || 2627 in6_dev->cnf.optimistic_dad) && 2628 !net->ipv6.devconf_all->forwarding && sllao) 2629 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 2630 #endif 2631 2632 /* Do not allow to create too much of autoconfigured 2633 * addresses; this would be too easy way to crash kernel. 2634 */ 2635 if (!max_addresses || 2636 ipv6_count_addresses(in6_dev) < max_addresses) 2637 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL); 2638 2639 if (IS_ERR_OR_NULL(ifp)) 2640 return -1; 2641 2642 create = 1; 2643 spin_lock_bh(&ifp->lock); 2644 ifp->flags |= IFA_F_MANAGETEMPADDR; 2645 ifp->cstamp = jiffies; 2646 ifp->tokenized = tokenized; 2647 spin_unlock_bh(&ifp->lock); 2648 addrconf_dad_start(ifp); 2649 } 2650 2651 if (ifp) { 2652 u32 flags; 2653 unsigned long now; 2654 u32 stored_lft; 2655 2656 /* update lifetime (RFC2462 5.5.3 e) */ 2657 spin_lock_bh(&ifp->lock); 2658 now = jiffies; 2659 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2660 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2661 else 2662 stored_lft = 0; 2663 2664 /* RFC4862 Section 5.5.3e: 2665 * "Note that the preferred lifetime of the 2666 * corresponding address is always reset to 2667 * the Preferred Lifetime in the received 2668 * Prefix Information option, regardless of 2669 * whether the valid lifetime is also reset or 2670 * ignored." 2671 * 2672 * So we should always update prefered_lft here. 2673 */ 2674 update_lft = !create && stored_lft; 2675 2676 if (update_lft && !in6_dev->cnf.ra_honor_pio_life) { 2677 const u32 minimum_lft = min_t(u32, 2678 stored_lft, MIN_VALID_LIFETIME); 2679 valid_lft = max(valid_lft, minimum_lft); 2680 } 2681 2682 if (update_lft) { 2683 ifp->valid_lft = valid_lft; 2684 ifp->prefered_lft = prefered_lft; 2685 ifp->tstamp = now; 2686 flags = ifp->flags; 2687 ifp->flags &= ~IFA_F_DEPRECATED; 2688 spin_unlock_bh(&ifp->lock); 2689 2690 if (!(flags&IFA_F_TENTATIVE)) 2691 ipv6_ifa_notify(0, ifp); 2692 } else 2693 spin_unlock_bh(&ifp->lock); 2694 2695 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2696 create, now); 2697 2698 in6_ifa_put(ifp); 2699 addrconf_verify(net); 2700 } 2701 2702 return 0; 2703 } 2704 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2705 2706 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2707 { 2708 struct prefix_info *pinfo; 2709 __u32 valid_lft; 2710 __u32 prefered_lft; 2711 int addr_type, err; 2712 u32 addr_flags = 0; 2713 struct inet6_dev *in6_dev; 2714 struct net *net = dev_net(dev); 2715 2716 pinfo = (struct prefix_info *) opt; 2717 2718 if (len < sizeof(struct prefix_info)) { 2719 netdev_dbg(dev, "addrconf: prefix option too short\n"); 2720 return; 2721 } 2722 2723 /* 2724 * Validation checks ([ADDRCONF], page 19) 2725 */ 2726 2727 addr_type = ipv6_addr_type(&pinfo->prefix); 2728 2729 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2730 return; 2731 2732 valid_lft = ntohl(pinfo->valid); 2733 prefered_lft = ntohl(pinfo->prefered); 2734 2735 if (prefered_lft > valid_lft) { 2736 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2737 return; 2738 } 2739 2740 in6_dev = in6_dev_get(dev); 2741 2742 if (!in6_dev) { 2743 net_dbg_ratelimited("addrconf: device %s not configured\n", 2744 dev->name); 2745 return; 2746 } 2747 2748 if (valid_lft != 0 && valid_lft < in6_dev->cnf.accept_ra_min_lft) 2749 goto put; 2750 2751 /* 2752 * Two things going on here: 2753 * 1) Add routes for on-link prefixes 2754 * 2) Configure prefixes with the auto flag set 2755 */ 2756 2757 if (pinfo->onlink) { 2758 struct fib6_info *rt; 2759 unsigned long rt_expires; 2760 2761 /* Avoid arithmetic overflow. Really, we could 2762 * save rt_expires in seconds, likely valid_lft, 2763 * but it would require division in fib gc, that it 2764 * not good. 2765 */ 2766 if (HZ > USER_HZ) 2767 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2768 else 2769 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2770 2771 if (addrconf_finite_timeout(rt_expires)) 2772 rt_expires *= HZ; 2773 2774 rt = addrconf_get_prefix_route(&pinfo->prefix, 2775 pinfo->prefix_len, 2776 dev, 2777 RTF_ADDRCONF | RTF_PREFIX_RT, 2778 RTF_DEFAULT, true); 2779 2780 if (rt) { 2781 /* Autoconf prefix route */ 2782 if (valid_lft == 0) { 2783 ip6_del_rt(net, rt, false); 2784 rt = NULL; 2785 } else if (addrconf_finite_timeout(rt_expires)) { 2786 /* not infinity */ 2787 fib6_set_expires(rt, jiffies + rt_expires); 2788 } else { 2789 fib6_clean_expires(rt); 2790 } 2791 } else if (valid_lft) { 2792 clock_t expires = 0; 2793 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2794 if (addrconf_finite_timeout(rt_expires)) { 2795 /* not infinity */ 2796 flags |= RTF_EXPIRES; 2797 expires = jiffies_to_clock_t(rt_expires); 2798 } 2799 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2800 0, dev, expires, flags, 2801 GFP_ATOMIC); 2802 } 2803 fib6_info_release(rt); 2804 } 2805 2806 /* Try to figure out our local address for this prefix */ 2807 2808 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2809 struct in6_addr addr; 2810 bool tokenized = false, dev_addr_generated = false; 2811 2812 if (pinfo->prefix_len == 64) { 2813 memcpy(&addr, &pinfo->prefix, 8); 2814 2815 if (!ipv6_addr_any(&in6_dev->token)) { 2816 read_lock_bh(&in6_dev->lock); 2817 memcpy(addr.s6_addr + 8, 2818 in6_dev->token.s6_addr + 8, 8); 2819 read_unlock_bh(&in6_dev->lock); 2820 tokenized = true; 2821 } else if (is_addr_mode_generate_stable(in6_dev) && 2822 !ipv6_generate_stable_address(&addr, 0, 2823 in6_dev)) { 2824 addr_flags |= IFA_F_STABLE_PRIVACY; 2825 goto ok; 2826 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2827 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2828 goto put; 2829 } else { 2830 dev_addr_generated = true; 2831 } 2832 goto ok; 2833 } 2834 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2835 pinfo->prefix_len); 2836 goto put; 2837 2838 ok: 2839 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2840 &addr, addr_type, 2841 addr_flags, sllao, 2842 tokenized, valid_lft, 2843 prefered_lft); 2844 if (err) 2845 goto put; 2846 2847 /* Ignore error case here because previous prefix add addr was 2848 * successful which will be notified. 2849 */ 2850 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2851 addr_type, addr_flags, sllao, 2852 tokenized, valid_lft, 2853 prefered_lft, 2854 dev_addr_generated); 2855 } 2856 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2857 put: 2858 in6_dev_put(in6_dev); 2859 } 2860 2861 static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev, 2862 struct in6_ifreq *ireq) 2863 { 2864 struct ip_tunnel_parm p = { }; 2865 int err; 2866 2867 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4)) 2868 return -EADDRNOTAVAIL; 2869 2870 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3]; 2871 p.iph.version = 4; 2872 p.iph.ihl = 5; 2873 p.iph.protocol = IPPROTO_IPV6; 2874 p.iph.ttl = 64; 2875 2876 if (!dev->netdev_ops->ndo_tunnel_ctl) 2877 return -EOPNOTSUPP; 2878 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL); 2879 if (err) 2880 return err; 2881 2882 dev = __dev_get_by_name(net, p.name); 2883 if (!dev) 2884 return -ENOBUFS; 2885 return dev_open(dev, NULL); 2886 } 2887 2888 /* 2889 * Set destination address. 2890 * Special case for SIT interfaces where we create a new "virtual" 2891 * device. 2892 */ 2893 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2894 { 2895 struct net_device *dev; 2896 struct in6_ifreq ireq; 2897 int err = -ENODEV; 2898 2899 if (!IS_ENABLED(CONFIG_IPV6_SIT)) 2900 return -ENODEV; 2901 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2902 return -EFAULT; 2903 2904 rtnl_lock(); 2905 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2906 if (dev && dev->type == ARPHRD_SIT) 2907 err = addrconf_set_sit_dstaddr(net, dev, &ireq); 2908 rtnl_unlock(); 2909 return err; 2910 } 2911 2912 static int ipv6_mc_config(struct sock *sk, bool join, 2913 const struct in6_addr *addr, int ifindex) 2914 { 2915 int ret; 2916 2917 ASSERT_RTNL(); 2918 2919 lock_sock(sk); 2920 if (join) 2921 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2922 else 2923 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2924 release_sock(sk); 2925 2926 return ret; 2927 } 2928 2929 /* 2930 * Manual configuration of address on an interface 2931 */ 2932 static int inet6_addr_add(struct net *net, int ifindex, 2933 struct ifa6_config *cfg, 2934 struct netlink_ext_ack *extack) 2935 { 2936 struct inet6_ifaddr *ifp; 2937 struct inet6_dev *idev; 2938 struct net_device *dev; 2939 unsigned long timeout; 2940 clock_t expires; 2941 u32 flags; 2942 2943 ASSERT_RTNL(); 2944 2945 if (cfg->plen > 128) { 2946 NL_SET_ERR_MSG_MOD(extack, "Invalid prefix length"); 2947 return -EINVAL; 2948 } 2949 2950 /* check the lifetime */ 2951 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) { 2952 NL_SET_ERR_MSG_MOD(extack, "address lifetime invalid"); 2953 return -EINVAL; 2954 } 2955 2956 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) { 2957 NL_SET_ERR_MSG_MOD(extack, "address with \"mngtmpaddr\" flag must have a prefix length of 64"); 2958 return -EINVAL; 2959 } 2960 2961 dev = __dev_get_by_index(net, ifindex); 2962 if (!dev) 2963 return -ENODEV; 2964 2965 idev = addrconf_add_dev(dev); 2966 if (IS_ERR(idev)) { 2967 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device"); 2968 return PTR_ERR(idev); 2969 } 2970 2971 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2972 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2973 true, cfg->pfx, ifindex); 2974 2975 if (ret < 0) { 2976 NL_SET_ERR_MSG_MOD(extack, "Multicast auto join failed"); 2977 return ret; 2978 } 2979 } 2980 2981 cfg->scope = ipv6_addr_scope(cfg->pfx); 2982 2983 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 2984 if (addrconf_finite_timeout(timeout)) { 2985 expires = jiffies_to_clock_t(timeout * HZ); 2986 cfg->valid_lft = timeout; 2987 flags = RTF_EXPIRES; 2988 } else { 2989 expires = 0; 2990 flags = 0; 2991 cfg->ifa_flags |= IFA_F_PERMANENT; 2992 } 2993 2994 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 2995 if (addrconf_finite_timeout(timeout)) { 2996 if (timeout == 0) 2997 cfg->ifa_flags |= IFA_F_DEPRECATED; 2998 cfg->preferred_lft = timeout; 2999 } 3000 3001 ifp = ipv6_add_addr(idev, cfg, true, extack); 3002 if (!IS_ERR(ifp)) { 3003 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 3004 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3005 ifp->rt_priority, dev, expires, 3006 flags, GFP_KERNEL); 3007 } 3008 3009 /* Send a netlink notification if DAD is enabled and 3010 * optimistic flag is not set 3011 */ 3012 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD))) 3013 ipv6_ifa_notify(0, ifp); 3014 /* 3015 * Note that section 3.1 of RFC 4429 indicates 3016 * that the Optimistic flag should not be set for 3017 * manually configured addresses 3018 */ 3019 addrconf_dad_start(ifp); 3020 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR) 3021 manage_tempaddrs(idev, ifp, cfg->valid_lft, 3022 cfg->preferred_lft, true, jiffies); 3023 in6_ifa_put(ifp); 3024 addrconf_verify_rtnl(net); 3025 return 0; 3026 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 3027 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false, 3028 cfg->pfx, ifindex); 3029 } 3030 3031 return PTR_ERR(ifp); 3032 } 3033 3034 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 3035 const struct in6_addr *pfx, unsigned int plen, 3036 struct netlink_ext_ack *extack) 3037 { 3038 struct inet6_ifaddr *ifp; 3039 struct inet6_dev *idev; 3040 struct net_device *dev; 3041 3042 if (plen > 128) { 3043 NL_SET_ERR_MSG_MOD(extack, "Invalid prefix length"); 3044 return -EINVAL; 3045 } 3046 3047 dev = __dev_get_by_index(net, ifindex); 3048 if (!dev) { 3049 NL_SET_ERR_MSG_MOD(extack, "Unable to find the interface"); 3050 return -ENODEV; 3051 } 3052 3053 idev = __in6_dev_get(dev); 3054 if (!idev) { 3055 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device"); 3056 return -ENXIO; 3057 } 3058 3059 read_lock_bh(&idev->lock); 3060 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3061 if (ifp->prefix_len == plen && 3062 ipv6_addr_equal(pfx, &ifp->addr)) { 3063 in6_ifa_hold(ifp); 3064 read_unlock_bh(&idev->lock); 3065 3066 if (!(ifp->flags & IFA_F_TEMPORARY) && 3067 (ifa_flags & IFA_F_MANAGETEMPADDR)) 3068 manage_tempaddrs(idev, ifp, 0, 0, false, 3069 jiffies); 3070 ipv6_del_addr(ifp); 3071 addrconf_verify_rtnl(net); 3072 if (ipv6_addr_is_multicast(pfx)) { 3073 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 3074 false, pfx, dev->ifindex); 3075 } 3076 return 0; 3077 } 3078 } 3079 read_unlock_bh(&idev->lock); 3080 3081 NL_SET_ERR_MSG_MOD(extack, "address not found"); 3082 return -EADDRNOTAVAIL; 3083 } 3084 3085 3086 int addrconf_add_ifaddr(struct net *net, void __user *arg) 3087 { 3088 struct ifa6_config cfg = { 3089 .ifa_flags = IFA_F_PERMANENT, 3090 .preferred_lft = INFINITY_LIFE_TIME, 3091 .valid_lft = INFINITY_LIFE_TIME, 3092 }; 3093 struct in6_ifreq ireq; 3094 int err; 3095 3096 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3097 return -EPERM; 3098 3099 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3100 return -EFAULT; 3101 3102 cfg.pfx = &ireq.ifr6_addr; 3103 cfg.plen = ireq.ifr6_prefixlen; 3104 3105 rtnl_lock(); 3106 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL); 3107 rtnl_unlock(); 3108 return err; 3109 } 3110 3111 int addrconf_del_ifaddr(struct net *net, void __user *arg) 3112 { 3113 struct in6_ifreq ireq; 3114 int err; 3115 3116 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3117 return -EPERM; 3118 3119 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3120 return -EFAULT; 3121 3122 rtnl_lock(); 3123 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 3124 ireq.ifr6_prefixlen, NULL); 3125 rtnl_unlock(); 3126 return err; 3127 } 3128 3129 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 3130 int plen, int scope, u8 proto) 3131 { 3132 struct inet6_ifaddr *ifp; 3133 struct ifa6_config cfg = { 3134 .pfx = addr, 3135 .plen = plen, 3136 .ifa_flags = IFA_F_PERMANENT, 3137 .valid_lft = INFINITY_LIFE_TIME, 3138 .preferred_lft = INFINITY_LIFE_TIME, 3139 .scope = scope, 3140 .ifa_proto = proto 3141 }; 3142 3143 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3144 if (!IS_ERR(ifp)) { 3145 spin_lock_bh(&ifp->lock); 3146 ifp->flags &= ~IFA_F_TENTATIVE; 3147 spin_unlock_bh(&ifp->lock); 3148 rt_genid_bump_ipv6(dev_net(idev->dev)); 3149 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3150 in6_ifa_put(ifp); 3151 } 3152 } 3153 3154 #if IS_ENABLED(CONFIG_IPV6_SIT) || IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3155 static void add_v4_addrs(struct inet6_dev *idev) 3156 { 3157 struct in6_addr addr; 3158 struct net_device *dev; 3159 struct net *net = dev_net(idev->dev); 3160 int scope, plen, offset = 0; 3161 u32 pflags = 0; 3162 3163 ASSERT_RTNL(); 3164 3165 memset(&addr, 0, sizeof(struct in6_addr)); 3166 /* in case of IP6GRE the dev_addr is an IPv6 and therefore we use only the last 4 bytes */ 3167 if (idev->dev->addr_len == sizeof(struct in6_addr)) 3168 offset = sizeof(struct in6_addr) - 4; 3169 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr + offset, 4); 3170 3171 if (!(idev->dev->flags & IFF_POINTOPOINT) && idev->dev->type == ARPHRD_SIT) { 3172 scope = IPV6_ADDR_COMPATv4; 3173 plen = 96; 3174 pflags |= RTF_NONEXTHOP; 3175 } else { 3176 if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE) 3177 return; 3178 3179 addr.s6_addr32[0] = htonl(0xfe800000); 3180 scope = IFA_LINK; 3181 plen = 64; 3182 } 3183 3184 if (addr.s6_addr32[3]) { 3185 add_addr(idev, &addr, plen, scope, IFAPROT_UNSPEC); 3186 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags, 3187 GFP_KERNEL); 3188 return; 3189 } 3190 3191 for_each_netdev(net, dev) { 3192 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3193 if (in_dev && (dev->flags & IFF_UP)) { 3194 struct in_ifaddr *ifa; 3195 int flag = scope; 3196 3197 in_dev_for_each_ifa_rtnl(ifa, in_dev) { 3198 addr.s6_addr32[3] = ifa->ifa_local; 3199 3200 if (ifa->ifa_scope == RT_SCOPE_LINK) 3201 continue; 3202 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3203 if (idev->dev->flags&IFF_POINTOPOINT) 3204 continue; 3205 flag |= IFA_HOST; 3206 } 3207 3208 add_addr(idev, &addr, plen, flag, 3209 IFAPROT_UNSPEC); 3210 addrconf_prefix_route(&addr, plen, 0, idev->dev, 3211 0, pflags, GFP_KERNEL); 3212 } 3213 } 3214 } 3215 } 3216 #endif 3217 3218 static void init_loopback(struct net_device *dev) 3219 { 3220 struct inet6_dev *idev; 3221 3222 /* ::1 */ 3223 3224 ASSERT_RTNL(); 3225 3226 idev = ipv6_find_idev(dev); 3227 if (IS_ERR(idev)) { 3228 pr_debug("%s: add_dev failed\n", __func__); 3229 return; 3230 } 3231 3232 add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFAPROT_KERNEL_LO); 3233 } 3234 3235 void addrconf_add_linklocal(struct inet6_dev *idev, 3236 const struct in6_addr *addr, u32 flags) 3237 { 3238 struct ifa6_config cfg = { 3239 .pfx = addr, 3240 .plen = 64, 3241 .ifa_flags = flags | IFA_F_PERMANENT, 3242 .valid_lft = INFINITY_LIFE_TIME, 3243 .preferred_lft = INFINITY_LIFE_TIME, 3244 .scope = IFA_LINK, 3245 .ifa_proto = IFAPROT_KERNEL_LL 3246 }; 3247 struct inet6_ifaddr *ifp; 3248 3249 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3250 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad || 3251 idev->cnf.optimistic_dad) && 3252 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3253 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 3254 #endif 3255 3256 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3257 if (!IS_ERR(ifp)) { 3258 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev, 3259 0, 0, GFP_ATOMIC); 3260 addrconf_dad_start(ifp); 3261 in6_ifa_put(ifp); 3262 } 3263 } 3264 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3265 3266 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3267 { 3268 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3269 return true; 3270 3271 if (address.s6_addr32[2] == htonl(0x02005eff) && 3272 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3273 return true; 3274 3275 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3276 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3277 return true; 3278 3279 return false; 3280 } 3281 3282 static int ipv6_generate_stable_address(struct in6_addr *address, 3283 u8 dad_count, 3284 const struct inet6_dev *idev) 3285 { 3286 static DEFINE_SPINLOCK(lock); 3287 static __u32 digest[SHA1_DIGEST_WORDS]; 3288 static __u32 workspace[SHA1_WORKSPACE_WORDS]; 3289 3290 static union { 3291 char __data[SHA1_BLOCK_SIZE]; 3292 struct { 3293 struct in6_addr secret; 3294 __be32 prefix[2]; 3295 unsigned char hwaddr[MAX_ADDR_LEN]; 3296 u8 dad_count; 3297 } __packed; 3298 } data; 3299 3300 struct in6_addr secret; 3301 struct in6_addr temp; 3302 struct net *net = dev_net(idev->dev); 3303 3304 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3305 3306 if (idev->cnf.stable_secret.initialized) 3307 secret = idev->cnf.stable_secret.secret; 3308 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3309 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3310 else 3311 return -1; 3312 3313 retry: 3314 spin_lock_bh(&lock); 3315 3316 sha1_init(digest); 3317 memset(&data, 0, sizeof(data)); 3318 memset(workspace, 0, sizeof(workspace)); 3319 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3320 data.prefix[0] = address->s6_addr32[0]; 3321 data.prefix[1] = address->s6_addr32[1]; 3322 data.secret = secret; 3323 data.dad_count = dad_count; 3324 3325 sha1_transform(digest, data.__data, workspace); 3326 3327 temp = *address; 3328 temp.s6_addr32[2] = (__force __be32)digest[0]; 3329 temp.s6_addr32[3] = (__force __be32)digest[1]; 3330 3331 spin_unlock_bh(&lock); 3332 3333 if (ipv6_reserved_interfaceid(temp)) { 3334 dad_count++; 3335 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3336 return -1; 3337 goto retry; 3338 } 3339 3340 *address = temp; 3341 return 0; 3342 } 3343 3344 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3345 { 3346 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3347 3348 if (s->initialized) 3349 return; 3350 s = &idev->cnf.stable_secret; 3351 get_random_bytes(&s->secret, sizeof(s->secret)); 3352 s->initialized = true; 3353 } 3354 3355 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3356 { 3357 struct in6_addr addr; 3358 3359 /* no link local addresses on L3 master devices */ 3360 if (netif_is_l3_master(idev->dev)) 3361 return; 3362 3363 /* no link local addresses on devices flagged as slaves */ 3364 if (idev->dev->priv_flags & IFF_NO_ADDRCONF) 3365 return; 3366 3367 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3368 3369 switch (idev->cnf.addr_gen_mode) { 3370 case IN6_ADDR_GEN_MODE_RANDOM: 3371 ipv6_gen_mode_random_init(idev); 3372 fallthrough; 3373 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3374 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3375 addrconf_add_linklocal(idev, &addr, 3376 IFA_F_STABLE_PRIVACY); 3377 else if (prefix_route) 3378 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3379 0, 0, GFP_KERNEL); 3380 break; 3381 case IN6_ADDR_GEN_MODE_EUI64: 3382 /* addrconf_add_linklocal also adds a prefix_route and we 3383 * only need to care about prefix routes if ipv6_generate_eui64 3384 * couldn't generate one. 3385 */ 3386 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3387 addrconf_add_linklocal(idev, &addr, 0); 3388 else if (prefix_route) 3389 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3390 0, 0, GFP_KERNEL); 3391 break; 3392 case IN6_ADDR_GEN_MODE_NONE: 3393 default: 3394 /* will not add any link local address */ 3395 break; 3396 } 3397 } 3398 3399 static void addrconf_dev_config(struct net_device *dev) 3400 { 3401 struct inet6_dev *idev; 3402 3403 ASSERT_RTNL(); 3404 3405 if ((dev->type != ARPHRD_ETHER) && 3406 (dev->type != ARPHRD_FDDI) && 3407 (dev->type != ARPHRD_ARCNET) && 3408 (dev->type != ARPHRD_INFINIBAND) && 3409 (dev->type != ARPHRD_IEEE1394) && 3410 (dev->type != ARPHRD_TUNNEL6) && 3411 (dev->type != ARPHRD_6LOWPAN) && 3412 (dev->type != ARPHRD_TUNNEL) && 3413 (dev->type != ARPHRD_NONE) && 3414 (dev->type != ARPHRD_RAWIP)) { 3415 /* Alas, we support only Ethernet autoconfiguration. */ 3416 idev = __in6_dev_get(dev); 3417 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP && 3418 dev->flags & IFF_MULTICAST) 3419 ipv6_mc_up(idev); 3420 return; 3421 } 3422 3423 idev = addrconf_add_dev(dev); 3424 if (IS_ERR(idev)) 3425 return; 3426 3427 /* this device type has no EUI support */ 3428 if (dev->type == ARPHRD_NONE && 3429 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3430 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3431 3432 addrconf_addr_gen(idev, false); 3433 } 3434 3435 #if IS_ENABLED(CONFIG_IPV6_SIT) 3436 static void addrconf_sit_config(struct net_device *dev) 3437 { 3438 struct inet6_dev *idev; 3439 3440 ASSERT_RTNL(); 3441 3442 /* 3443 * Configure the tunnel with one of our IPv4 3444 * addresses... we should configure all of 3445 * our v4 addrs in the tunnel 3446 */ 3447 3448 idev = ipv6_find_idev(dev); 3449 if (IS_ERR(idev)) { 3450 pr_debug("%s: add_dev failed\n", __func__); 3451 return; 3452 } 3453 3454 if (dev->priv_flags & IFF_ISATAP) { 3455 addrconf_addr_gen(idev, false); 3456 return; 3457 } 3458 3459 add_v4_addrs(idev); 3460 3461 if (dev->flags&IFF_POINTOPOINT) 3462 addrconf_add_mroute(dev); 3463 } 3464 #endif 3465 3466 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3467 static void addrconf_gre_config(struct net_device *dev) 3468 { 3469 struct inet6_dev *idev; 3470 3471 ASSERT_RTNL(); 3472 3473 idev = ipv6_find_idev(dev); 3474 if (IS_ERR(idev)) { 3475 pr_debug("%s: add_dev failed\n", __func__); 3476 return; 3477 } 3478 3479 if (dev->type == ARPHRD_ETHER) { 3480 addrconf_addr_gen(idev, true); 3481 return; 3482 } 3483 3484 add_v4_addrs(idev); 3485 3486 if (dev->flags & IFF_POINTOPOINT) 3487 addrconf_add_mroute(dev); 3488 } 3489 #endif 3490 3491 static void addrconf_init_auto_addrs(struct net_device *dev) 3492 { 3493 switch (dev->type) { 3494 #if IS_ENABLED(CONFIG_IPV6_SIT) 3495 case ARPHRD_SIT: 3496 addrconf_sit_config(dev); 3497 break; 3498 #endif 3499 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3500 case ARPHRD_IP6GRE: 3501 case ARPHRD_IPGRE: 3502 addrconf_gre_config(dev); 3503 break; 3504 #endif 3505 case ARPHRD_LOOPBACK: 3506 init_loopback(dev); 3507 break; 3508 3509 default: 3510 addrconf_dev_config(dev); 3511 break; 3512 } 3513 } 3514 3515 static int fixup_permanent_addr(struct net *net, 3516 struct inet6_dev *idev, 3517 struct inet6_ifaddr *ifp) 3518 { 3519 /* !fib6_node means the host route was removed from the 3520 * FIB, for example, if 'lo' device is taken down. In that 3521 * case regenerate the host route. 3522 */ 3523 if (!ifp->rt || !ifp->rt->fib6_node) { 3524 struct fib6_info *f6i, *prev; 3525 3526 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false, 3527 GFP_ATOMIC, NULL); 3528 if (IS_ERR(f6i)) 3529 return PTR_ERR(f6i); 3530 3531 /* ifp->rt can be accessed outside of rtnl */ 3532 spin_lock(&ifp->lock); 3533 prev = ifp->rt; 3534 ifp->rt = f6i; 3535 spin_unlock(&ifp->lock); 3536 3537 fib6_info_release(prev); 3538 } 3539 3540 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3541 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3542 ifp->rt_priority, idev->dev, 0, 0, 3543 GFP_ATOMIC); 3544 } 3545 3546 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3547 addrconf_dad_start(ifp); 3548 3549 return 0; 3550 } 3551 3552 static void addrconf_permanent_addr(struct net *net, struct net_device *dev) 3553 { 3554 struct inet6_ifaddr *ifp, *tmp; 3555 struct inet6_dev *idev; 3556 3557 idev = __in6_dev_get(dev); 3558 if (!idev) 3559 return; 3560 3561 write_lock_bh(&idev->lock); 3562 3563 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3564 if ((ifp->flags & IFA_F_PERMANENT) && 3565 fixup_permanent_addr(net, idev, ifp) < 0) { 3566 write_unlock_bh(&idev->lock); 3567 in6_ifa_hold(ifp); 3568 ipv6_del_addr(ifp); 3569 write_lock_bh(&idev->lock); 3570 3571 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3572 idev->dev->name, &ifp->addr); 3573 } 3574 } 3575 3576 write_unlock_bh(&idev->lock); 3577 } 3578 3579 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3580 void *ptr) 3581 { 3582 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3583 struct netdev_notifier_change_info *change_info; 3584 struct netdev_notifier_changeupper_info *info; 3585 struct inet6_dev *idev = __in6_dev_get(dev); 3586 struct net *net = dev_net(dev); 3587 int run_pending = 0; 3588 int err; 3589 3590 switch (event) { 3591 case NETDEV_REGISTER: 3592 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3593 idev = ipv6_add_dev(dev); 3594 if (IS_ERR(idev)) 3595 return notifier_from_errno(PTR_ERR(idev)); 3596 } 3597 break; 3598 3599 case NETDEV_CHANGEMTU: 3600 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3601 if (dev->mtu < IPV6_MIN_MTU) { 3602 addrconf_ifdown(dev, dev != net->loopback_dev); 3603 break; 3604 } 3605 3606 if (idev) { 3607 rt6_mtu_change(dev, dev->mtu); 3608 idev->cnf.mtu6 = dev->mtu; 3609 break; 3610 } 3611 3612 /* allocate new idev */ 3613 idev = ipv6_add_dev(dev); 3614 if (IS_ERR(idev)) 3615 break; 3616 3617 /* device is still not ready */ 3618 if (!(idev->if_flags & IF_READY)) 3619 break; 3620 3621 run_pending = 1; 3622 fallthrough; 3623 case NETDEV_UP: 3624 case NETDEV_CHANGE: 3625 if (idev && idev->cnf.disable_ipv6) 3626 break; 3627 3628 if (dev->priv_flags & IFF_NO_ADDRCONF) { 3629 if (event == NETDEV_UP && !IS_ERR_OR_NULL(idev) && 3630 dev->flags & IFF_UP && dev->flags & IFF_MULTICAST) 3631 ipv6_mc_up(idev); 3632 break; 3633 } 3634 3635 if (event == NETDEV_UP) { 3636 /* restore routes for permanent addresses */ 3637 addrconf_permanent_addr(net, dev); 3638 3639 if (!addrconf_link_ready(dev)) { 3640 /* device is not ready yet. */ 3641 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3642 dev->name); 3643 break; 3644 } 3645 3646 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3647 idev = ipv6_add_dev(dev); 3648 3649 if (!IS_ERR_OR_NULL(idev)) { 3650 idev->if_flags |= IF_READY; 3651 run_pending = 1; 3652 } 3653 } else if (event == NETDEV_CHANGE) { 3654 if (!addrconf_link_ready(dev)) { 3655 /* device is still not ready. */ 3656 rt6_sync_down_dev(dev, event); 3657 break; 3658 } 3659 3660 if (!IS_ERR_OR_NULL(idev)) { 3661 if (idev->if_flags & IF_READY) { 3662 /* device is already configured - 3663 * but resend MLD reports, we might 3664 * have roamed and need to update 3665 * multicast snooping switches 3666 */ 3667 ipv6_mc_up(idev); 3668 change_info = ptr; 3669 if (change_info->flags_changed & IFF_NOARP) 3670 addrconf_dad_run(idev, true); 3671 rt6_sync_up(dev, RTNH_F_LINKDOWN); 3672 break; 3673 } 3674 idev->if_flags |= IF_READY; 3675 } 3676 3677 pr_debug("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3678 dev->name); 3679 3680 run_pending = 1; 3681 } 3682 3683 addrconf_init_auto_addrs(dev); 3684 3685 if (!IS_ERR_OR_NULL(idev)) { 3686 if (run_pending) 3687 addrconf_dad_run(idev, false); 3688 3689 /* Device has an address by now */ 3690 rt6_sync_up(dev, RTNH_F_DEAD); 3691 3692 /* 3693 * If the MTU changed during the interface down, 3694 * when the interface up, the changed MTU must be 3695 * reflected in the idev as well as routers. 3696 */ 3697 if (idev->cnf.mtu6 != dev->mtu && 3698 dev->mtu >= IPV6_MIN_MTU) { 3699 rt6_mtu_change(dev, dev->mtu); 3700 idev->cnf.mtu6 = dev->mtu; 3701 } 3702 idev->tstamp = jiffies; 3703 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3704 3705 /* 3706 * If the changed mtu during down is lower than 3707 * IPV6_MIN_MTU stop IPv6 on this interface. 3708 */ 3709 if (dev->mtu < IPV6_MIN_MTU) 3710 addrconf_ifdown(dev, dev != net->loopback_dev); 3711 } 3712 break; 3713 3714 case NETDEV_DOWN: 3715 case NETDEV_UNREGISTER: 3716 /* 3717 * Remove all addresses from this interface. 3718 */ 3719 addrconf_ifdown(dev, event != NETDEV_DOWN); 3720 break; 3721 3722 case NETDEV_CHANGENAME: 3723 if (idev) { 3724 snmp6_unregister_dev(idev); 3725 addrconf_sysctl_unregister(idev); 3726 err = addrconf_sysctl_register(idev); 3727 if (err) 3728 return notifier_from_errno(err); 3729 err = snmp6_register_dev(idev); 3730 if (err) { 3731 addrconf_sysctl_unregister(idev); 3732 return notifier_from_errno(err); 3733 } 3734 } 3735 break; 3736 3737 case NETDEV_PRE_TYPE_CHANGE: 3738 case NETDEV_POST_TYPE_CHANGE: 3739 if (idev) 3740 addrconf_type_change(dev, event); 3741 break; 3742 3743 case NETDEV_CHANGEUPPER: 3744 info = ptr; 3745 3746 /* flush all routes if dev is linked to or unlinked from 3747 * an L3 master device (e.g., VRF) 3748 */ 3749 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3750 addrconf_ifdown(dev, false); 3751 } 3752 3753 return NOTIFY_OK; 3754 } 3755 3756 /* 3757 * addrconf module should be notified of a device going up 3758 */ 3759 static struct notifier_block ipv6_dev_notf = { 3760 .notifier_call = addrconf_notify, 3761 .priority = ADDRCONF_NOTIFY_PRIORITY, 3762 }; 3763 3764 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3765 { 3766 struct inet6_dev *idev; 3767 ASSERT_RTNL(); 3768 3769 idev = __in6_dev_get(dev); 3770 3771 if (event == NETDEV_POST_TYPE_CHANGE) 3772 ipv6_mc_remap(idev); 3773 else if (event == NETDEV_PRE_TYPE_CHANGE) 3774 ipv6_mc_unmap(idev); 3775 } 3776 3777 static bool addr_is_local(const struct in6_addr *addr) 3778 { 3779 return ipv6_addr_type(addr) & 3780 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3781 } 3782 3783 static int addrconf_ifdown(struct net_device *dev, bool unregister) 3784 { 3785 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN; 3786 struct net *net = dev_net(dev); 3787 struct inet6_dev *idev; 3788 struct inet6_ifaddr *ifa; 3789 LIST_HEAD(tmp_addr_list); 3790 bool keep_addr = false; 3791 bool was_ready; 3792 int state, i; 3793 3794 ASSERT_RTNL(); 3795 3796 rt6_disable_ip(dev, event); 3797 3798 idev = __in6_dev_get(dev); 3799 if (!idev) 3800 return -ENODEV; 3801 3802 /* 3803 * Step 1: remove reference to ipv6 device from parent device. 3804 * Do not dev_put! 3805 */ 3806 if (unregister) { 3807 idev->dead = 1; 3808 3809 /* protected by rtnl_lock */ 3810 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3811 3812 /* Step 1.5: remove snmp6 entry */ 3813 snmp6_unregister_dev(idev); 3814 3815 } 3816 3817 /* combine the user config with event to determine if permanent 3818 * addresses are to be removed from address hash table 3819 */ 3820 if (!unregister && !idev->cnf.disable_ipv6) { 3821 /* aggregate the system setting and interface setting */ 3822 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3823 3824 if (!_keep_addr) 3825 _keep_addr = idev->cnf.keep_addr_on_down; 3826 3827 keep_addr = (_keep_addr > 0); 3828 } 3829 3830 /* Step 2: clear hash table */ 3831 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3832 struct hlist_head *h = &net->ipv6.inet6_addr_lst[i]; 3833 3834 spin_lock_bh(&net->ipv6.addrconf_hash_lock); 3835 restart: 3836 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3837 if (ifa->idev == idev) { 3838 addrconf_del_dad_work(ifa); 3839 /* combined flag + permanent flag decide if 3840 * address is retained on a down event 3841 */ 3842 if (!keep_addr || 3843 !(ifa->flags & IFA_F_PERMANENT) || 3844 addr_is_local(&ifa->addr)) { 3845 hlist_del_init_rcu(&ifa->addr_lst); 3846 goto restart; 3847 } 3848 } 3849 } 3850 spin_unlock_bh(&net->ipv6.addrconf_hash_lock); 3851 } 3852 3853 write_lock_bh(&idev->lock); 3854 3855 addrconf_del_rs_timer(idev); 3856 3857 /* Step 2: clear flags for stateless addrconf, repeated down 3858 * detection 3859 */ 3860 was_ready = idev->if_flags & IF_READY; 3861 if (!unregister) 3862 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3863 3864 /* Step 3: clear tempaddr list */ 3865 while (!list_empty(&idev->tempaddr_list)) { 3866 ifa = list_first_entry(&idev->tempaddr_list, 3867 struct inet6_ifaddr, tmp_list); 3868 list_del(&ifa->tmp_list); 3869 write_unlock_bh(&idev->lock); 3870 spin_lock_bh(&ifa->lock); 3871 3872 if (ifa->ifpub) { 3873 in6_ifa_put(ifa->ifpub); 3874 ifa->ifpub = NULL; 3875 } 3876 spin_unlock_bh(&ifa->lock); 3877 in6_ifa_put(ifa); 3878 write_lock_bh(&idev->lock); 3879 } 3880 3881 list_for_each_entry(ifa, &idev->addr_list, if_list) 3882 list_add_tail(&ifa->if_list_aux, &tmp_addr_list); 3883 write_unlock_bh(&idev->lock); 3884 3885 while (!list_empty(&tmp_addr_list)) { 3886 struct fib6_info *rt = NULL; 3887 bool keep; 3888 3889 ifa = list_first_entry(&tmp_addr_list, 3890 struct inet6_ifaddr, if_list_aux); 3891 list_del(&ifa->if_list_aux); 3892 3893 addrconf_del_dad_work(ifa); 3894 3895 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3896 !addr_is_local(&ifa->addr); 3897 3898 spin_lock_bh(&ifa->lock); 3899 3900 if (keep) { 3901 /* set state to skip the notifier below */ 3902 state = INET6_IFADDR_STATE_DEAD; 3903 ifa->state = INET6_IFADDR_STATE_PREDAD; 3904 if (!(ifa->flags & IFA_F_NODAD)) 3905 ifa->flags |= IFA_F_TENTATIVE; 3906 3907 rt = ifa->rt; 3908 ifa->rt = NULL; 3909 } else { 3910 state = ifa->state; 3911 ifa->state = INET6_IFADDR_STATE_DEAD; 3912 } 3913 3914 spin_unlock_bh(&ifa->lock); 3915 3916 if (rt) 3917 ip6_del_rt(net, rt, false); 3918 3919 if (state != INET6_IFADDR_STATE_DEAD) { 3920 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3921 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3922 } else { 3923 if (idev->cnf.forwarding) 3924 addrconf_leave_anycast(ifa); 3925 addrconf_leave_solict(ifa->idev, &ifa->addr); 3926 } 3927 3928 if (!keep) { 3929 write_lock_bh(&idev->lock); 3930 list_del_rcu(&ifa->if_list); 3931 write_unlock_bh(&idev->lock); 3932 in6_ifa_put(ifa); 3933 } 3934 } 3935 3936 /* Step 5: Discard anycast and multicast list */ 3937 if (unregister) { 3938 ipv6_ac_destroy_dev(idev); 3939 ipv6_mc_destroy_dev(idev); 3940 } else if (was_ready) { 3941 ipv6_mc_down(idev); 3942 } 3943 3944 idev->tstamp = jiffies; 3945 idev->ra_mtu = 0; 3946 3947 /* Last: Shot the device (if unregistered) */ 3948 if (unregister) { 3949 addrconf_sysctl_unregister(idev); 3950 neigh_parms_release(&nd_tbl, idev->nd_parms); 3951 neigh_ifdown(&nd_tbl, dev); 3952 in6_dev_put(idev); 3953 } 3954 return 0; 3955 } 3956 3957 static void addrconf_rs_timer(struct timer_list *t) 3958 { 3959 struct inet6_dev *idev = from_timer(idev, t, rs_timer); 3960 struct net_device *dev = idev->dev; 3961 struct in6_addr lladdr; 3962 3963 write_lock(&idev->lock); 3964 if (idev->dead || !(idev->if_flags & IF_READY)) 3965 goto out; 3966 3967 if (!ipv6_accept_ra(idev)) 3968 goto out; 3969 3970 /* Announcement received after solicitation was sent */ 3971 if (idev->if_flags & IF_RA_RCVD) 3972 goto out; 3973 3974 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3975 write_unlock(&idev->lock); 3976 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3977 ndisc_send_rs(dev, &lladdr, 3978 &in6addr_linklocal_allrouters); 3979 else 3980 goto put; 3981 3982 write_lock(&idev->lock); 3983 idev->rs_interval = rfc3315_s14_backoff_update( 3984 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3985 /* The wait after the last probe can be shorter */ 3986 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3987 idev->cnf.rtr_solicits) ? 3988 idev->cnf.rtr_solicit_delay : 3989 idev->rs_interval); 3990 } else { 3991 /* 3992 * Note: we do not support deprecated "all on-link" 3993 * assumption any longer. 3994 */ 3995 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3996 } 3997 3998 out: 3999 write_unlock(&idev->lock); 4000 put: 4001 in6_dev_put(idev); 4002 } 4003 4004 /* 4005 * Duplicate Address Detection 4006 */ 4007 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 4008 { 4009 unsigned long rand_num; 4010 struct inet6_dev *idev = ifp->idev; 4011 u64 nonce; 4012 4013 if (ifp->flags & IFA_F_OPTIMISTIC) 4014 rand_num = 0; 4015 else 4016 rand_num = get_random_u32_below(idev->cnf.rtr_solicit_delay ? : 1); 4017 4018 nonce = 0; 4019 if (idev->cnf.enhanced_dad || 4020 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 4021 do 4022 get_random_bytes(&nonce, 6); 4023 while (nonce == 0); 4024 } 4025 ifp->dad_nonce = nonce; 4026 ifp->dad_probes = idev->cnf.dad_transmits; 4027 addrconf_mod_dad_work(ifp, rand_num); 4028 } 4029 4030 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 4031 { 4032 struct inet6_dev *idev = ifp->idev; 4033 struct net_device *dev = idev->dev; 4034 bool bump_id, notify = false; 4035 struct net *net; 4036 4037 addrconf_join_solict(dev, &ifp->addr); 4038 4039 read_lock_bh(&idev->lock); 4040 spin_lock(&ifp->lock); 4041 if (ifp->state == INET6_IFADDR_STATE_DEAD) 4042 goto out; 4043 4044 net = dev_net(dev); 4045 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 4046 (net->ipv6.devconf_all->accept_dad < 1 && 4047 idev->cnf.accept_dad < 1) || 4048 !(ifp->flags&IFA_F_TENTATIVE) || 4049 ifp->flags & IFA_F_NODAD) { 4050 bool send_na = false; 4051 4052 if (ifp->flags & IFA_F_TENTATIVE && 4053 !(ifp->flags & IFA_F_OPTIMISTIC)) 4054 send_na = true; 4055 bump_id = ifp->flags & IFA_F_TENTATIVE; 4056 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4057 spin_unlock(&ifp->lock); 4058 read_unlock_bh(&idev->lock); 4059 4060 addrconf_dad_completed(ifp, bump_id, send_na); 4061 return; 4062 } 4063 4064 if (!(idev->if_flags & IF_READY)) { 4065 spin_unlock(&ifp->lock); 4066 read_unlock_bh(&idev->lock); 4067 /* 4068 * If the device is not ready: 4069 * - keep it tentative if it is a permanent address. 4070 * - otherwise, kill it. 4071 */ 4072 in6_ifa_hold(ifp); 4073 addrconf_dad_stop(ifp, 0); 4074 return; 4075 } 4076 4077 /* 4078 * Optimistic nodes can start receiving 4079 * Frames right away 4080 */ 4081 if (ifp->flags & IFA_F_OPTIMISTIC) { 4082 ip6_ins_rt(net, ifp->rt); 4083 if (ipv6_use_optimistic_addr(net, idev)) { 4084 /* Because optimistic nodes can use this address, 4085 * notify listeners. If DAD fails, RTM_DELADDR is sent. 4086 */ 4087 notify = true; 4088 } 4089 } 4090 4091 addrconf_dad_kick(ifp); 4092 out: 4093 spin_unlock(&ifp->lock); 4094 read_unlock_bh(&idev->lock); 4095 if (notify) 4096 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4097 } 4098 4099 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 4100 { 4101 bool begin_dad = false; 4102 4103 spin_lock_bh(&ifp->lock); 4104 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 4105 ifp->state = INET6_IFADDR_STATE_PREDAD; 4106 begin_dad = true; 4107 } 4108 spin_unlock_bh(&ifp->lock); 4109 4110 if (begin_dad) 4111 addrconf_mod_dad_work(ifp, 0); 4112 } 4113 4114 static void addrconf_dad_work(struct work_struct *w) 4115 { 4116 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 4117 struct inet6_ifaddr, 4118 dad_work); 4119 struct inet6_dev *idev = ifp->idev; 4120 bool bump_id, disable_ipv6 = false; 4121 struct in6_addr mcaddr; 4122 4123 enum { 4124 DAD_PROCESS, 4125 DAD_BEGIN, 4126 DAD_ABORT, 4127 } action = DAD_PROCESS; 4128 4129 rtnl_lock(); 4130 4131 spin_lock_bh(&ifp->lock); 4132 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 4133 action = DAD_BEGIN; 4134 ifp->state = INET6_IFADDR_STATE_DAD; 4135 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 4136 action = DAD_ABORT; 4137 ifp->state = INET6_IFADDR_STATE_POSTDAD; 4138 4139 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 || 4140 idev->cnf.accept_dad > 1) && 4141 !idev->cnf.disable_ipv6 && 4142 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 4143 struct in6_addr addr; 4144 4145 addr.s6_addr32[0] = htonl(0xfe800000); 4146 addr.s6_addr32[1] = 0; 4147 4148 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 4149 ipv6_addr_equal(&ifp->addr, &addr)) { 4150 /* DAD failed for link-local based on MAC */ 4151 idev->cnf.disable_ipv6 = 1; 4152 4153 pr_info("%s: IPv6 being disabled!\n", 4154 ifp->idev->dev->name); 4155 disable_ipv6 = true; 4156 } 4157 } 4158 } 4159 spin_unlock_bh(&ifp->lock); 4160 4161 if (action == DAD_BEGIN) { 4162 addrconf_dad_begin(ifp); 4163 goto out; 4164 } else if (action == DAD_ABORT) { 4165 in6_ifa_hold(ifp); 4166 addrconf_dad_stop(ifp, 1); 4167 if (disable_ipv6) 4168 addrconf_ifdown(idev->dev, false); 4169 goto out; 4170 } 4171 4172 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 4173 goto out; 4174 4175 write_lock_bh(&idev->lock); 4176 if (idev->dead || !(idev->if_flags & IF_READY)) { 4177 write_unlock_bh(&idev->lock); 4178 goto out; 4179 } 4180 4181 spin_lock(&ifp->lock); 4182 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 4183 spin_unlock(&ifp->lock); 4184 write_unlock_bh(&idev->lock); 4185 goto out; 4186 } 4187 4188 if (ifp->dad_probes == 0) { 4189 bool send_na = false; 4190 4191 /* 4192 * DAD was successful 4193 */ 4194 4195 if (ifp->flags & IFA_F_TENTATIVE && 4196 !(ifp->flags & IFA_F_OPTIMISTIC)) 4197 send_na = true; 4198 bump_id = ifp->flags & IFA_F_TENTATIVE; 4199 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4200 spin_unlock(&ifp->lock); 4201 write_unlock_bh(&idev->lock); 4202 4203 addrconf_dad_completed(ifp, bump_id, send_na); 4204 4205 goto out; 4206 } 4207 4208 ifp->dad_probes--; 4209 addrconf_mod_dad_work(ifp, 4210 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), 4211 HZ/100)); 4212 spin_unlock(&ifp->lock); 4213 write_unlock_bh(&idev->lock); 4214 4215 /* send a neighbour solicitation for our addr */ 4216 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 4217 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 4218 ifp->dad_nonce); 4219 out: 4220 in6_ifa_put(ifp); 4221 rtnl_unlock(); 4222 } 4223 4224 /* ifp->idev must be at least read locked */ 4225 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4226 { 4227 struct inet6_ifaddr *ifpiter; 4228 struct inet6_dev *idev = ifp->idev; 4229 4230 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4231 if (ifpiter->scope > IFA_LINK) 4232 break; 4233 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4234 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4235 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4236 IFA_F_PERMANENT) 4237 return false; 4238 } 4239 return true; 4240 } 4241 4242 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 4243 bool send_na) 4244 { 4245 struct net_device *dev = ifp->idev->dev; 4246 struct in6_addr lladdr; 4247 bool send_rs, send_mld; 4248 4249 addrconf_del_dad_work(ifp); 4250 4251 /* 4252 * Configure the address for reception. Now it is valid. 4253 */ 4254 4255 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4256 4257 /* If added prefix is link local and we are prepared to process 4258 router advertisements, start sending router solicitations. 4259 */ 4260 4261 read_lock_bh(&ifp->idev->lock); 4262 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4263 send_rs = send_mld && 4264 ipv6_accept_ra(ifp->idev) && 4265 ifp->idev->cnf.rtr_solicits != 0 && 4266 (dev->flags & IFF_LOOPBACK) == 0 && 4267 (dev->type != ARPHRD_TUNNEL) && 4268 !netif_is_team_port(dev); 4269 read_unlock_bh(&ifp->idev->lock); 4270 4271 /* While dad is in progress mld report's source address is in6_addrany. 4272 * Resend with proper ll now. 4273 */ 4274 if (send_mld) 4275 ipv6_mc_dad_complete(ifp->idev); 4276 4277 /* send unsolicited NA if enabled */ 4278 if (send_na && 4279 (ifp->idev->cnf.ndisc_notify || 4280 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) { 4281 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr, 4282 /*router=*/ !!ifp->idev->cnf.forwarding, 4283 /*solicited=*/ false, /*override=*/ true, 4284 /*inc_opt=*/ true); 4285 } 4286 4287 if (send_rs) { 4288 /* 4289 * If a host as already performed a random delay 4290 * [...] as part of DAD [...] there is no need 4291 * to delay again before sending the first RS 4292 */ 4293 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4294 return; 4295 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4296 4297 write_lock_bh(&ifp->idev->lock); 4298 spin_lock(&ifp->lock); 4299 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4300 ifp->idev->cnf.rtr_solicit_interval); 4301 ifp->idev->rs_probes = 1; 4302 ifp->idev->if_flags |= IF_RS_SENT; 4303 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4304 spin_unlock(&ifp->lock); 4305 write_unlock_bh(&ifp->idev->lock); 4306 } 4307 4308 if (bump_id) 4309 rt_genid_bump_ipv6(dev_net(dev)); 4310 4311 /* Make sure that a new temporary address will be created 4312 * before this temporary address becomes deprecated. 4313 */ 4314 if (ifp->flags & IFA_F_TEMPORARY) 4315 addrconf_verify_rtnl(dev_net(dev)); 4316 } 4317 4318 static void addrconf_dad_run(struct inet6_dev *idev, bool restart) 4319 { 4320 struct inet6_ifaddr *ifp; 4321 4322 read_lock_bh(&idev->lock); 4323 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4324 spin_lock(&ifp->lock); 4325 if ((ifp->flags & IFA_F_TENTATIVE && 4326 ifp->state == INET6_IFADDR_STATE_DAD) || restart) { 4327 if (restart) 4328 ifp->state = INET6_IFADDR_STATE_PREDAD; 4329 addrconf_dad_kick(ifp); 4330 } 4331 spin_unlock(&ifp->lock); 4332 } 4333 read_unlock_bh(&idev->lock); 4334 } 4335 4336 #ifdef CONFIG_PROC_FS 4337 struct if6_iter_state { 4338 struct seq_net_private p; 4339 int bucket; 4340 int offset; 4341 }; 4342 4343 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4344 { 4345 struct if6_iter_state *state = seq->private; 4346 struct net *net = seq_file_net(seq); 4347 struct inet6_ifaddr *ifa = NULL; 4348 int p = 0; 4349 4350 /* initial bucket if pos is 0 */ 4351 if (pos == 0) { 4352 state->bucket = 0; 4353 state->offset = 0; 4354 } 4355 4356 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4357 hlist_for_each_entry_rcu(ifa, &net->ipv6.inet6_addr_lst[state->bucket], 4358 addr_lst) { 4359 /* sync with offset */ 4360 if (p < state->offset) { 4361 p++; 4362 continue; 4363 } 4364 return ifa; 4365 } 4366 4367 /* prepare for next bucket */ 4368 state->offset = 0; 4369 p = 0; 4370 } 4371 return NULL; 4372 } 4373 4374 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4375 struct inet6_ifaddr *ifa) 4376 { 4377 struct if6_iter_state *state = seq->private; 4378 struct net *net = seq_file_net(seq); 4379 4380 hlist_for_each_entry_continue_rcu(ifa, addr_lst) { 4381 state->offset++; 4382 return ifa; 4383 } 4384 4385 state->offset = 0; 4386 while (++state->bucket < IN6_ADDR_HSIZE) { 4387 hlist_for_each_entry_rcu(ifa, 4388 &net->ipv6.inet6_addr_lst[state->bucket], addr_lst) { 4389 return ifa; 4390 } 4391 } 4392 4393 return NULL; 4394 } 4395 4396 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4397 __acquires(rcu) 4398 { 4399 rcu_read_lock(); 4400 return if6_get_first(seq, *pos); 4401 } 4402 4403 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4404 { 4405 struct inet6_ifaddr *ifa; 4406 4407 ifa = if6_get_next(seq, v); 4408 ++*pos; 4409 return ifa; 4410 } 4411 4412 static void if6_seq_stop(struct seq_file *seq, void *v) 4413 __releases(rcu) 4414 { 4415 rcu_read_unlock(); 4416 } 4417 4418 static int if6_seq_show(struct seq_file *seq, void *v) 4419 { 4420 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4421 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4422 &ifp->addr, 4423 ifp->idev->dev->ifindex, 4424 ifp->prefix_len, 4425 ifp->scope, 4426 (u8) ifp->flags, 4427 ifp->idev->dev->name); 4428 return 0; 4429 } 4430 4431 static const struct seq_operations if6_seq_ops = { 4432 .start = if6_seq_start, 4433 .next = if6_seq_next, 4434 .show = if6_seq_show, 4435 .stop = if6_seq_stop, 4436 }; 4437 4438 static int __net_init if6_proc_net_init(struct net *net) 4439 { 4440 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops, 4441 sizeof(struct if6_iter_state))) 4442 return -ENOMEM; 4443 return 0; 4444 } 4445 4446 static void __net_exit if6_proc_net_exit(struct net *net) 4447 { 4448 remove_proc_entry("if_inet6", net->proc_net); 4449 } 4450 4451 static struct pernet_operations if6_proc_net_ops = { 4452 .init = if6_proc_net_init, 4453 .exit = if6_proc_net_exit, 4454 }; 4455 4456 int __init if6_proc_init(void) 4457 { 4458 return register_pernet_subsys(&if6_proc_net_ops); 4459 } 4460 4461 void if6_proc_exit(void) 4462 { 4463 unregister_pernet_subsys(&if6_proc_net_ops); 4464 } 4465 #endif /* CONFIG_PROC_FS */ 4466 4467 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4468 /* Check if address is a home address configured on any interface. */ 4469 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4470 { 4471 unsigned int hash = inet6_addr_hash(net, addr); 4472 struct inet6_ifaddr *ifp = NULL; 4473 int ret = 0; 4474 4475 rcu_read_lock(); 4476 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 4477 if (ipv6_addr_equal(&ifp->addr, addr) && 4478 (ifp->flags & IFA_F_HOMEADDRESS)) { 4479 ret = 1; 4480 break; 4481 } 4482 } 4483 rcu_read_unlock(); 4484 return ret; 4485 } 4486 #endif 4487 4488 /* RFC6554 has some algorithm to avoid loops in segment routing by 4489 * checking if the segments contains any of a local interface address. 4490 * 4491 * Quote: 4492 * 4493 * To detect loops in the SRH, a router MUST determine if the SRH 4494 * includes multiple addresses assigned to any interface on that router. 4495 * If such addresses appear more than once and are separated by at least 4496 * one address not assigned to that router. 4497 */ 4498 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs, 4499 unsigned char nsegs) 4500 { 4501 const struct in6_addr *addr; 4502 int i, ret = 0, found = 0; 4503 struct inet6_ifaddr *ifp; 4504 bool separated = false; 4505 unsigned int hash; 4506 bool hash_found; 4507 4508 rcu_read_lock(); 4509 for (i = 0; i < nsegs; i++) { 4510 addr = &segs[i]; 4511 hash = inet6_addr_hash(net, addr); 4512 4513 hash_found = false; 4514 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 4515 4516 if (ipv6_addr_equal(&ifp->addr, addr)) { 4517 hash_found = true; 4518 break; 4519 } 4520 } 4521 4522 if (hash_found) { 4523 if (found > 1 && separated) { 4524 ret = 1; 4525 break; 4526 } 4527 4528 separated = false; 4529 found++; 4530 } else { 4531 separated = true; 4532 } 4533 } 4534 rcu_read_unlock(); 4535 4536 return ret; 4537 } 4538 4539 /* 4540 * Periodic address status verification 4541 */ 4542 4543 static void addrconf_verify_rtnl(struct net *net) 4544 { 4545 unsigned long now, next, next_sec, next_sched; 4546 struct inet6_ifaddr *ifp; 4547 int i; 4548 4549 ASSERT_RTNL(); 4550 4551 rcu_read_lock_bh(); 4552 now = jiffies; 4553 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4554 4555 cancel_delayed_work(&net->ipv6.addr_chk_work); 4556 4557 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4558 restart: 4559 hlist_for_each_entry_rcu_bh(ifp, &net->ipv6.inet6_addr_lst[i], addr_lst) { 4560 unsigned long age; 4561 4562 /* When setting preferred_lft to a value not zero or 4563 * infinity, while valid_lft is infinity 4564 * IFA_F_PERMANENT has a non-infinity life time. 4565 */ 4566 if ((ifp->flags & IFA_F_PERMANENT) && 4567 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4568 continue; 4569 4570 spin_lock(&ifp->lock); 4571 /* We try to batch several events at once. */ 4572 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4573 4574 if ((ifp->flags&IFA_F_TEMPORARY) && 4575 !(ifp->flags&IFA_F_TENTATIVE) && 4576 ifp->prefered_lft != INFINITY_LIFE_TIME && 4577 !ifp->regen_count && ifp->ifpub) { 4578 /* This is a non-regenerated temporary addr. */ 4579 4580 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4581 ifp->idev->cnf.dad_transmits * 4582 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 4583 4584 if (age + regen_advance >= ifp->prefered_lft) { 4585 struct inet6_ifaddr *ifpub = ifp->ifpub; 4586 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4587 next = ifp->tstamp + ifp->prefered_lft * HZ; 4588 4589 ifp->regen_count++; 4590 in6_ifa_hold(ifp); 4591 in6_ifa_hold(ifpub); 4592 spin_unlock(&ifp->lock); 4593 4594 spin_lock(&ifpub->lock); 4595 ifpub->regen_count = 0; 4596 spin_unlock(&ifpub->lock); 4597 rcu_read_unlock_bh(); 4598 ipv6_create_tempaddr(ifpub, true); 4599 in6_ifa_put(ifpub); 4600 in6_ifa_put(ifp); 4601 rcu_read_lock_bh(); 4602 goto restart; 4603 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4604 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4605 } 4606 4607 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4608 age >= ifp->valid_lft) { 4609 spin_unlock(&ifp->lock); 4610 in6_ifa_hold(ifp); 4611 rcu_read_unlock_bh(); 4612 ipv6_del_addr(ifp); 4613 rcu_read_lock_bh(); 4614 goto restart; 4615 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4616 spin_unlock(&ifp->lock); 4617 continue; 4618 } else if (age >= ifp->prefered_lft) { 4619 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4620 int deprecate = 0; 4621 4622 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4623 deprecate = 1; 4624 ifp->flags |= IFA_F_DEPRECATED; 4625 } 4626 4627 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4628 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4629 next = ifp->tstamp + ifp->valid_lft * HZ; 4630 4631 spin_unlock(&ifp->lock); 4632 4633 if (deprecate) { 4634 in6_ifa_hold(ifp); 4635 4636 ipv6_ifa_notify(0, ifp); 4637 in6_ifa_put(ifp); 4638 goto restart; 4639 } 4640 } else { 4641 /* ifp->prefered_lft <= ifp->valid_lft */ 4642 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4643 next = ifp->tstamp + ifp->prefered_lft * HZ; 4644 spin_unlock(&ifp->lock); 4645 } 4646 } 4647 } 4648 4649 next_sec = round_jiffies_up(next); 4650 next_sched = next; 4651 4652 /* If rounded timeout is accurate enough, accept it. */ 4653 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4654 next_sched = next_sec; 4655 4656 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4657 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4658 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4659 4660 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4661 now, next, next_sec, next_sched); 4662 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, next_sched - now); 4663 rcu_read_unlock_bh(); 4664 } 4665 4666 static void addrconf_verify_work(struct work_struct *w) 4667 { 4668 struct net *net = container_of(to_delayed_work(w), struct net, 4669 ipv6.addr_chk_work); 4670 4671 rtnl_lock(); 4672 addrconf_verify_rtnl(net); 4673 rtnl_unlock(); 4674 } 4675 4676 static void addrconf_verify(struct net *net) 4677 { 4678 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, 0); 4679 } 4680 4681 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4682 struct in6_addr **peer_pfx) 4683 { 4684 struct in6_addr *pfx = NULL; 4685 4686 *peer_pfx = NULL; 4687 4688 if (addr) 4689 pfx = nla_data(addr); 4690 4691 if (local) { 4692 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4693 *peer_pfx = pfx; 4694 pfx = nla_data(local); 4695 } 4696 4697 return pfx; 4698 } 4699 4700 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4701 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4702 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4703 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4704 [IFA_FLAGS] = { .len = sizeof(u32) }, 4705 [IFA_RT_PRIORITY] = { .len = sizeof(u32) }, 4706 [IFA_TARGET_NETNSID] = { .type = NLA_S32 }, 4707 [IFA_PROTO] = { .type = NLA_U8 }, 4708 }; 4709 4710 static int 4711 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4712 struct netlink_ext_ack *extack) 4713 { 4714 struct net *net = sock_net(skb->sk); 4715 struct ifaddrmsg *ifm; 4716 struct nlattr *tb[IFA_MAX+1]; 4717 struct in6_addr *pfx, *peer_pfx; 4718 u32 ifa_flags; 4719 int err; 4720 4721 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4722 ifa_ipv6_policy, extack); 4723 if (err < 0) 4724 return err; 4725 4726 ifm = nlmsg_data(nlh); 4727 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4728 if (!pfx) 4729 return -EINVAL; 4730 4731 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4732 4733 /* We ignore other flags so far. */ 4734 ifa_flags &= IFA_F_MANAGETEMPADDR; 4735 4736 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4737 ifm->ifa_prefixlen, extack); 4738 } 4739 4740 static int modify_prefix_route(struct inet6_ifaddr *ifp, 4741 unsigned long expires, u32 flags, 4742 bool modify_peer) 4743 { 4744 struct fib6_info *f6i; 4745 u32 prio; 4746 4747 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4748 ifp->prefix_len, 4749 ifp->idev->dev, 0, RTF_DEFAULT, true); 4750 if (!f6i) 4751 return -ENOENT; 4752 4753 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF; 4754 if (f6i->fib6_metric != prio) { 4755 /* delete old one */ 4756 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 4757 4758 /* add new one */ 4759 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4760 ifp->prefix_len, 4761 ifp->rt_priority, ifp->idev->dev, 4762 expires, flags, GFP_KERNEL); 4763 } else { 4764 if (!expires) 4765 fib6_clean_expires(f6i); 4766 else 4767 fib6_set_expires(f6i, expires); 4768 4769 fib6_info_release(f6i); 4770 } 4771 4772 return 0; 4773 } 4774 4775 static int inet6_addr_modify(struct net *net, struct inet6_ifaddr *ifp, 4776 struct ifa6_config *cfg) 4777 { 4778 u32 flags; 4779 clock_t expires; 4780 unsigned long timeout; 4781 bool was_managetempaddr; 4782 bool had_prefixroute; 4783 bool new_peer = false; 4784 4785 ASSERT_RTNL(); 4786 4787 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 4788 return -EINVAL; 4789 4790 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && 4791 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4792 return -EINVAL; 4793 4794 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED) 4795 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC; 4796 4797 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 4798 if (addrconf_finite_timeout(timeout)) { 4799 expires = jiffies_to_clock_t(timeout * HZ); 4800 cfg->valid_lft = timeout; 4801 flags = RTF_EXPIRES; 4802 } else { 4803 expires = 0; 4804 flags = 0; 4805 cfg->ifa_flags |= IFA_F_PERMANENT; 4806 } 4807 4808 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 4809 if (addrconf_finite_timeout(timeout)) { 4810 if (timeout == 0) 4811 cfg->ifa_flags |= IFA_F_DEPRECATED; 4812 cfg->preferred_lft = timeout; 4813 } 4814 4815 if (cfg->peer_pfx && 4816 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) { 4817 if (!ipv6_addr_any(&ifp->peer_addr)) 4818 cleanup_prefix_route(ifp, expires, true, true); 4819 new_peer = true; 4820 } 4821 4822 spin_lock_bh(&ifp->lock); 4823 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4824 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4825 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4826 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4827 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4828 IFA_F_NOPREFIXROUTE); 4829 ifp->flags |= cfg->ifa_flags; 4830 ifp->tstamp = jiffies; 4831 ifp->valid_lft = cfg->valid_lft; 4832 ifp->prefered_lft = cfg->preferred_lft; 4833 ifp->ifa_proto = cfg->ifa_proto; 4834 4835 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority) 4836 ifp->rt_priority = cfg->rt_priority; 4837 4838 if (new_peer) 4839 ifp->peer_addr = *cfg->peer_pfx; 4840 4841 spin_unlock_bh(&ifp->lock); 4842 if (!(ifp->flags&IFA_F_TENTATIVE)) 4843 ipv6_ifa_notify(0, ifp); 4844 4845 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 4846 int rc = -ENOENT; 4847 4848 if (had_prefixroute) 4849 rc = modify_prefix_route(ifp, expires, flags, false); 4850 4851 /* prefix route could have been deleted; if so restore it */ 4852 if (rc == -ENOENT) { 4853 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4854 ifp->rt_priority, ifp->idev->dev, 4855 expires, flags, GFP_KERNEL); 4856 } 4857 4858 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr)) 4859 rc = modify_prefix_route(ifp, expires, flags, true); 4860 4861 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) { 4862 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len, 4863 ifp->rt_priority, ifp->idev->dev, 4864 expires, flags, GFP_KERNEL); 4865 } 4866 } else if (had_prefixroute) { 4867 enum cleanup_prefix_rt_t action; 4868 unsigned long rt_expires; 4869 4870 write_lock_bh(&ifp->idev->lock); 4871 action = check_cleanup_prefix_route(ifp, &rt_expires); 4872 write_unlock_bh(&ifp->idev->lock); 4873 4874 if (action != CLEANUP_PREFIX_RT_NOP) { 4875 cleanup_prefix_route(ifp, rt_expires, 4876 action == CLEANUP_PREFIX_RT_DEL, false); 4877 } 4878 } 4879 4880 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4881 if (was_managetempaddr && 4882 !(ifp->flags & IFA_F_MANAGETEMPADDR)) { 4883 cfg->valid_lft = 0; 4884 cfg->preferred_lft = 0; 4885 } 4886 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft, 4887 cfg->preferred_lft, !was_managetempaddr, 4888 jiffies); 4889 } 4890 4891 addrconf_verify_rtnl(net); 4892 4893 return 0; 4894 } 4895 4896 static int 4897 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4898 struct netlink_ext_ack *extack) 4899 { 4900 struct net *net = sock_net(skb->sk); 4901 struct ifaddrmsg *ifm; 4902 struct nlattr *tb[IFA_MAX+1]; 4903 struct in6_addr *peer_pfx; 4904 struct inet6_ifaddr *ifa; 4905 struct net_device *dev; 4906 struct inet6_dev *idev; 4907 struct ifa6_config cfg; 4908 int err; 4909 4910 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4911 ifa_ipv6_policy, extack); 4912 if (err < 0) 4913 return err; 4914 4915 memset(&cfg, 0, sizeof(cfg)); 4916 4917 ifm = nlmsg_data(nlh); 4918 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4919 if (!cfg.pfx) 4920 return -EINVAL; 4921 4922 cfg.peer_pfx = peer_pfx; 4923 cfg.plen = ifm->ifa_prefixlen; 4924 if (tb[IFA_RT_PRIORITY]) 4925 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]); 4926 4927 if (tb[IFA_PROTO]) 4928 cfg.ifa_proto = nla_get_u8(tb[IFA_PROTO]); 4929 4930 cfg.valid_lft = INFINITY_LIFE_TIME; 4931 cfg.preferred_lft = INFINITY_LIFE_TIME; 4932 4933 if (tb[IFA_CACHEINFO]) { 4934 struct ifa_cacheinfo *ci; 4935 4936 ci = nla_data(tb[IFA_CACHEINFO]); 4937 cfg.valid_lft = ci->ifa_valid; 4938 cfg.preferred_lft = ci->ifa_prefered; 4939 } 4940 4941 dev = __dev_get_by_index(net, ifm->ifa_index); 4942 if (!dev) { 4943 NL_SET_ERR_MSG_MOD(extack, "Unable to find the interface"); 4944 return -ENODEV; 4945 } 4946 4947 if (tb[IFA_FLAGS]) 4948 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]); 4949 else 4950 cfg.ifa_flags = ifm->ifa_flags; 4951 4952 /* We ignore other flags so far. */ 4953 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | 4954 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE | 4955 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC; 4956 4957 idev = ipv6_find_idev(dev); 4958 if (IS_ERR(idev)) 4959 return PTR_ERR(idev); 4960 4961 if (!ipv6_allow_optimistic_dad(net, idev)) 4962 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC; 4963 4964 if (cfg.ifa_flags & IFA_F_NODAD && 4965 cfg.ifa_flags & IFA_F_OPTIMISTIC) { 4966 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive"); 4967 return -EINVAL; 4968 } 4969 4970 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1); 4971 if (!ifa) { 4972 /* 4973 * It would be best to check for !NLM_F_CREATE here but 4974 * userspace already relies on not having to provide this. 4975 */ 4976 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack); 4977 } 4978 4979 if (nlh->nlmsg_flags & NLM_F_EXCL || 4980 !(nlh->nlmsg_flags & NLM_F_REPLACE)) { 4981 NL_SET_ERR_MSG_MOD(extack, "address already assigned"); 4982 err = -EEXIST; 4983 } else { 4984 err = inet6_addr_modify(net, ifa, &cfg); 4985 } 4986 4987 in6_ifa_put(ifa); 4988 4989 return err; 4990 } 4991 4992 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4993 u8 scope, int ifindex) 4994 { 4995 struct ifaddrmsg *ifm; 4996 4997 ifm = nlmsg_data(nlh); 4998 ifm->ifa_family = AF_INET6; 4999 ifm->ifa_prefixlen = prefixlen; 5000 ifm->ifa_flags = flags; 5001 ifm->ifa_scope = scope; 5002 ifm->ifa_index = ifindex; 5003 } 5004 5005 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 5006 unsigned long tstamp, u32 preferred, u32 valid) 5007 { 5008 struct ifa_cacheinfo ci; 5009 5010 ci.cstamp = cstamp_delta(cstamp); 5011 ci.tstamp = cstamp_delta(tstamp); 5012 ci.ifa_prefered = preferred; 5013 ci.ifa_valid = valid; 5014 5015 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 5016 } 5017 5018 static inline int rt_scope(int ifa_scope) 5019 { 5020 if (ifa_scope & IFA_HOST) 5021 return RT_SCOPE_HOST; 5022 else if (ifa_scope & IFA_LINK) 5023 return RT_SCOPE_LINK; 5024 else if (ifa_scope & IFA_SITE) 5025 return RT_SCOPE_SITE; 5026 else 5027 return RT_SCOPE_UNIVERSE; 5028 } 5029 5030 static inline int inet6_ifaddr_msgsize(void) 5031 { 5032 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 5033 + nla_total_size(16) /* IFA_LOCAL */ 5034 + nla_total_size(16) /* IFA_ADDRESS */ 5035 + nla_total_size(sizeof(struct ifa_cacheinfo)) 5036 + nla_total_size(4) /* IFA_FLAGS */ 5037 + nla_total_size(1) /* IFA_PROTO */ 5038 + nla_total_size(4) /* IFA_RT_PRIORITY */; 5039 } 5040 5041 enum addr_type_t { 5042 UNICAST_ADDR, 5043 MULTICAST_ADDR, 5044 ANYCAST_ADDR, 5045 }; 5046 5047 struct inet6_fill_args { 5048 u32 portid; 5049 u32 seq; 5050 int event; 5051 unsigned int flags; 5052 int netnsid; 5053 int ifindex; 5054 enum addr_type_t type; 5055 }; 5056 5057 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 5058 struct inet6_fill_args *args) 5059 { 5060 struct nlmsghdr *nlh; 5061 u32 preferred, valid; 5062 5063 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5064 sizeof(struct ifaddrmsg), args->flags); 5065 if (!nlh) 5066 return -EMSGSIZE; 5067 5068 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 5069 ifa->idev->dev->ifindex); 5070 5071 if (args->netnsid >= 0 && 5072 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 5073 goto error; 5074 5075 spin_lock_bh(&ifa->lock); 5076 if (!((ifa->flags&IFA_F_PERMANENT) && 5077 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 5078 preferred = ifa->prefered_lft; 5079 valid = ifa->valid_lft; 5080 if (preferred != INFINITY_LIFE_TIME) { 5081 long tval = (jiffies - ifa->tstamp)/HZ; 5082 if (preferred > tval) 5083 preferred -= tval; 5084 else 5085 preferred = 0; 5086 if (valid != INFINITY_LIFE_TIME) { 5087 if (valid > tval) 5088 valid -= tval; 5089 else 5090 valid = 0; 5091 } 5092 } 5093 } else { 5094 preferred = INFINITY_LIFE_TIME; 5095 valid = INFINITY_LIFE_TIME; 5096 } 5097 spin_unlock_bh(&ifa->lock); 5098 5099 if (!ipv6_addr_any(&ifa->peer_addr)) { 5100 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 5101 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 5102 goto error; 5103 } else 5104 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 5105 goto error; 5106 5107 if (ifa->rt_priority && 5108 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority)) 5109 goto error; 5110 5111 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 5112 goto error; 5113 5114 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 5115 goto error; 5116 5117 if (ifa->ifa_proto && 5118 nla_put_u8(skb, IFA_PROTO, ifa->ifa_proto)) 5119 goto error; 5120 5121 nlmsg_end(skb, nlh); 5122 return 0; 5123 5124 error: 5125 nlmsg_cancel(skb, nlh); 5126 return -EMSGSIZE; 5127 } 5128 5129 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 5130 struct inet6_fill_args *args) 5131 { 5132 struct nlmsghdr *nlh; 5133 u8 scope = RT_SCOPE_UNIVERSE; 5134 int ifindex = ifmca->idev->dev->ifindex; 5135 5136 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 5137 scope = RT_SCOPE_SITE; 5138 5139 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5140 sizeof(struct ifaddrmsg), args->flags); 5141 if (!nlh) 5142 return -EMSGSIZE; 5143 5144 if (args->netnsid >= 0 && 5145 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5146 nlmsg_cancel(skb, nlh); 5147 return -EMSGSIZE; 5148 } 5149 5150 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5151 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 5152 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 5153 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5154 nlmsg_cancel(skb, nlh); 5155 return -EMSGSIZE; 5156 } 5157 5158 nlmsg_end(skb, nlh); 5159 return 0; 5160 } 5161 5162 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 5163 struct inet6_fill_args *args) 5164 { 5165 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt); 5166 int ifindex = dev ? dev->ifindex : 1; 5167 struct nlmsghdr *nlh; 5168 u8 scope = RT_SCOPE_UNIVERSE; 5169 5170 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 5171 scope = RT_SCOPE_SITE; 5172 5173 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5174 sizeof(struct ifaddrmsg), args->flags); 5175 if (!nlh) 5176 return -EMSGSIZE; 5177 5178 if (args->netnsid >= 0 && 5179 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5180 nlmsg_cancel(skb, nlh); 5181 return -EMSGSIZE; 5182 } 5183 5184 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5185 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 5186 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 5187 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5188 nlmsg_cancel(skb, nlh); 5189 return -EMSGSIZE; 5190 } 5191 5192 nlmsg_end(skb, nlh); 5193 return 0; 5194 } 5195 5196 /* called with rcu_read_lock() */ 5197 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 5198 struct netlink_callback *cb, int s_ip_idx, 5199 struct inet6_fill_args *fillargs) 5200 { 5201 struct ifmcaddr6 *ifmca; 5202 struct ifacaddr6 *ifaca; 5203 int ip_idx = 0; 5204 int err = 1; 5205 5206 read_lock_bh(&idev->lock); 5207 switch (fillargs->type) { 5208 case UNICAST_ADDR: { 5209 struct inet6_ifaddr *ifa; 5210 fillargs->event = RTM_NEWADDR; 5211 5212 /* unicast address incl. temp addr */ 5213 list_for_each_entry(ifa, &idev->addr_list, if_list) { 5214 if (ip_idx < s_ip_idx) 5215 goto next; 5216 err = inet6_fill_ifaddr(skb, ifa, fillargs); 5217 if (err < 0) 5218 break; 5219 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 5220 next: 5221 ip_idx++; 5222 } 5223 break; 5224 } 5225 case MULTICAST_ADDR: 5226 read_unlock_bh(&idev->lock); 5227 fillargs->event = RTM_GETMULTICAST; 5228 5229 /* multicast address */ 5230 for (ifmca = rtnl_dereference(idev->mc_list); 5231 ifmca; 5232 ifmca = rtnl_dereference(ifmca->next), ip_idx++) { 5233 if (ip_idx < s_ip_idx) 5234 continue; 5235 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs); 5236 if (err < 0) 5237 break; 5238 } 5239 read_lock_bh(&idev->lock); 5240 break; 5241 case ANYCAST_ADDR: 5242 fillargs->event = RTM_GETANYCAST; 5243 /* anycast address */ 5244 for (ifaca = idev->ac_list; ifaca; 5245 ifaca = ifaca->aca_next, ip_idx++) { 5246 if (ip_idx < s_ip_idx) 5247 continue; 5248 err = inet6_fill_ifacaddr(skb, ifaca, fillargs); 5249 if (err < 0) 5250 break; 5251 } 5252 break; 5253 default: 5254 break; 5255 } 5256 read_unlock_bh(&idev->lock); 5257 cb->args[2] = ip_idx; 5258 return err; 5259 } 5260 5261 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh, 5262 struct inet6_fill_args *fillargs, 5263 struct net **tgt_net, struct sock *sk, 5264 struct netlink_callback *cb) 5265 { 5266 struct netlink_ext_ack *extack = cb->extack; 5267 struct nlattr *tb[IFA_MAX+1]; 5268 struct ifaddrmsg *ifm; 5269 int err, i; 5270 5271 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5272 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request"); 5273 return -EINVAL; 5274 } 5275 5276 ifm = nlmsg_data(nlh); 5277 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5278 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request"); 5279 return -EINVAL; 5280 } 5281 5282 fillargs->ifindex = ifm->ifa_index; 5283 if (fillargs->ifindex) { 5284 cb->answer_flags |= NLM_F_DUMP_FILTERED; 5285 fillargs->flags |= NLM_F_DUMP_FILTERED; 5286 } 5287 5288 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5289 ifa_ipv6_policy, extack); 5290 if (err < 0) 5291 return err; 5292 5293 for (i = 0; i <= IFA_MAX; ++i) { 5294 if (!tb[i]) 5295 continue; 5296 5297 if (i == IFA_TARGET_NETNSID) { 5298 struct net *net; 5299 5300 fillargs->netnsid = nla_get_s32(tb[i]); 5301 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid); 5302 if (IS_ERR(net)) { 5303 fillargs->netnsid = -1; 5304 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id"); 5305 return PTR_ERR(net); 5306 } 5307 *tgt_net = net; 5308 } else { 5309 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); 5310 return -EINVAL; 5311 } 5312 } 5313 5314 return 0; 5315 } 5316 5317 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 5318 enum addr_type_t type) 5319 { 5320 const struct nlmsghdr *nlh = cb->nlh; 5321 struct inet6_fill_args fillargs = { 5322 .portid = NETLINK_CB(cb->skb).portid, 5323 .seq = cb->nlh->nlmsg_seq, 5324 .flags = NLM_F_MULTI, 5325 .netnsid = -1, 5326 .type = type, 5327 }; 5328 struct net *tgt_net = sock_net(skb->sk); 5329 int idx, s_idx, s_ip_idx; 5330 int h, s_h; 5331 struct net_device *dev; 5332 struct inet6_dev *idev; 5333 struct hlist_head *head; 5334 int err = 0; 5335 5336 s_h = cb->args[0]; 5337 s_idx = idx = cb->args[1]; 5338 s_ip_idx = cb->args[2]; 5339 5340 if (cb->strict_check) { 5341 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net, 5342 skb->sk, cb); 5343 if (err < 0) 5344 goto put_tgt_net; 5345 5346 err = 0; 5347 if (fillargs.ifindex) { 5348 dev = __dev_get_by_index(tgt_net, fillargs.ifindex); 5349 if (!dev) { 5350 err = -ENODEV; 5351 goto put_tgt_net; 5352 } 5353 idev = __in6_dev_get(dev); 5354 if (idev) { 5355 err = in6_dump_addrs(idev, skb, cb, s_ip_idx, 5356 &fillargs); 5357 if (err > 0) 5358 err = 0; 5359 } 5360 goto put_tgt_net; 5361 } 5362 } 5363 5364 rcu_read_lock(); 5365 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq; 5366 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5367 idx = 0; 5368 head = &tgt_net->dev_index_head[h]; 5369 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5370 if (idx < s_idx) 5371 goto cont; 5372 if (h > s_h || idx > s_idx) 5373 s_ip_idx = 0; 5374 idev = __in6_dev_get(dev); 5375 if (!idev) 5376 goto cont; 5377 5378 if (in6_dump_addrs(idev, skb, cb, s_ip_idx, 5379 &fillargs) < 0) 5380 goto done; 5381 cont: 5382 idx++; 5383 } 5384 } 5385 done: 5386 rcu_read_unlock(); 5387 cb->args[0] = h; 5388 cb->args[1] = idx; 5389 put_tgt_net: 5390 if (fillargs.netnsid >= 0) 5391 put_net(tgt_net); 5392 5393 return skb->len ? : err; 5394 } 5395 5396 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 5397 { 5398 enum addr_type_t type = UNICAST_ADDR; 5399 5400 return inet6_dump_addr(skb, cb, type); 5401 } 5402 5403 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 5404 { 5405 enum addr_type_t type = MULTICAST_ADDR; 5406 5407 return inet6_dump_addr(skb, cb, type); 5408 } 5409 5410 5411 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 5412 { 5413 enum addr_type_t type = ANYCAST_ADDR; 5414 5415 return inet6_dump_addr(skb, cb, type); 5416 } 5417 5418 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb, 5419 const struct nlmsghdr *nlh, 5420 struct nlattr **tb, 5421 struct netlink_ext_ack *extack) 5422 { 5423 struct ifaddrmsg *ifm; 5424 int i, err; 5425 5426 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5427 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request"); 5428 return -EINVAL; 5429 } 5430 5431 if (!netlink_strict_get_check(skb)) 5432 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 5433 ifa_ipv6_policy, extack); 5434 5435 ifm = nlmsg_data(nlh); 5436 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5437 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request"); 5438 return -EINVAL; 5439 } 5440 5441 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5442 ifa_ipv6_policy, extack); 5443 if (err) 5444 return err; 5445 5446 for (i = 0; i <= IFA_MAX; i++) { 5447 if (!tb[i]) 5448 continue; 5449 5450 switch (i) { 5451 case IFA_TARGET_NETNSID: 5452 case IFA_ADDRESS: 5453 case IFA_LOCAL: 5454 break; 5455 default: 5456 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request"); 5457 return -EINVAL; 5458 } 5459 } 5460 5461 return 0; 5462 } 5463 5464 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 5465 struct netlink_ext_ack *extack) 5466 { 5467 struct net *tgt_net = sock_net(in_skb->sk); 5468 struct inet6_fill_args fillargs = { 5469 .portid = NETLINK_CB(in_skb).portid, 5470 .seq = nlh->nlmsg_seq, 5471 .event = RTM_NEWADDR, 5472 .flags = 0, 5473 .netnsid = -1, 5474 }; 5475 struct ifaddrmsg *ifm; 5476 struct nlattr *tb[IFA_MAX+1]; 5477 struct in6_addr *addr = NULL, *peer; 5478 struct net_device *dev = NULL; 5479 struct inet6_ifaddr *ifa; 5480 struct sk_buff *skb; 5481 int err; 5482 5483 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack); 5484 if (err < 0) 5485 return err; 5486 5487 if (tb[IFA_TARGET_NETNSID]) { 5488 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]); 5489 5490 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk, 5491 fillargs.netnsid); 5492 if (IS_ERR(tgt_net)) 5493 return PTR_ERR(tgt_net); 5494 } 5495 5496 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 5497 if (!addr) 5498 return -EINVAL; 5499 5500 ifm = nlmsg_data(nlh); 5501 if (ifm->ifa_index) 5502 dev = dev_get_by_index(tgt_net, ifm->ifa_index); 5503 5504 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1); 5505 if (!ifa) { 5506 err = -EADDRNOTAVAIL; 5507 goto errout; 5508 } 5509 5510 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 5511 if (!skb) { 5512 err = -ENOBUFS; 5513 goto errout_ifa; 5514 } 5515 5516 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5517 if (err < 0) { 5518 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5519 WARN_ON(err == -EMSGSIZE); 5520 kfree_skb(skb); 5521 goto errout_ifa; 5522 } 5523 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid); 5524 errout_ifa: 5525 in6_ifa_put(ifa); 5526 errout: 5527 dev_put(dev); 5528 if (fillargs.netnsid >= 0) 5529 put_net(tgt_net); 5530 5531 return err; 5532 } 5533 5534 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 5535 { 5536 struct sk_buff *skb; 5537 struct net *net = dev_net(ifa->idev->dev); 5538 struct inet6_fill_args fillargs = { 5539 .portid = 0, 5540 .seq = 0, 5541 .event = event, 5542 .flags = 0, 5543 .netnsid = -1, 5544 }; 5545 int err = -ENOBUFS; 5546 5547 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 5548 if (!skb) 5549 goto errout; 5550 5551 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5552 if (err < 0) { 5553 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5554 WARN_ON(err == -EMSGSIZE); 5555 kfree_skb(skb); 5556 goto errout; 5557 } 5558 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 5559 return; 5560 errout: 5561 if (err < 0) 5562 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 5563 } 5564 5565 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 5566 __s32 *array, int bytes) 5567 { 5568 BUG_ON(bytes < (DEVCONF_MAX * 4)); 5569 5570 memset(array, 0, bytes); 5571 array[DEVCONF_FORWARDING] = cnf->forwarding; 5572 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 5573 array[DEVCONF_MTU6] = cnf->mtu6; 5574 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 5575 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 5576 array[DEVCONF_AUTOCONF] = cnf->autoconf; 5577 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 5578 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 5579 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5580 jiffies_to_msecs(cnf->rtr_solicit_interval); 5581 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5582 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 5583 array[DEVCONF_RTR_SOLICIT_DELAY] = 5584 jiffies_to_msecs(cnf->rtr_solicit_delay); 5585 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 5586 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5587 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 5588 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5589 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 5590 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 5591 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 5592 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 5593 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 5594 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 5595 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 5596 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 5597 array[DEVCONF_RA_DEFRTR_METRIC] = cnf->ra_defrtr_metric; 5598 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 5599 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 5600 #ifdef CONFIG_IPV6_ROUTER_PREF 5601 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 5602 array[DEVCONF_RTR_PROBE_INTERVAL] = 5603 jiffies_to_msecs(cnf->rtr_probe_interval); 5604 #ifdef CONFIG_IPV6_ROUTE_INFO 5605 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen; 5606 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 5607 #endif 5608 #endif 5609 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 5610 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 5611 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5612 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 5613 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 5614 #endif 5615 #ifdef CONFIG_IPV6_MROUTE 5616 array[DEVCONF_MC_FORWARDING] = atomic_read(&cnf->mc_forwarding); 5617 #endif 5618 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 5619 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 5620 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 5621 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 5622 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 5623 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 5624 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 5625 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 5626 /* we omit DEVCONF_STABLE_SECRET for now */ 5627 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 5628 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 5629 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 5630 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5631 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5632 #ifdef CONFIG_IPV6_SEG6_HMAC 5633 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5634 #endif 5635 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5636 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5637 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy; 5638 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass; 5639 array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled; 5640 array[DEVCONF_IOAM6_ENABLED] = cnf->ioam6_enabled; 5641 array[DEVCONF_IOAM6_ID] = cnf->ioam6_id; 5642 array[DEVCONF_IOAM6_ID_WIDE] = cnf->ioam6_id_wide; 5643 array[DEVCONF_NDISC_EVICT_NOCARRIER] = cnf->ndisc_evict_nocarrier; 5644 array[DEVCONF_ACCEPT_UNTRACKED_NA] = cnf->accept_untracked_na; 5645 array[DEVCONF_ACCEPT_RA_MIN_LFT] = cnf->accept_ra_min_lft; 5646 } 5647 5648 static inline size_t inet6_ifla6_size(void) 5649 { 5650 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5651 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5652 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5653 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5654 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5655 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */ 5656 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */ 5657 + nla_total_size(4) /* IFLA_INET6_RA_MTU */ 5658 + 0; 5659 } 5660 5661 static inline size_t inet6_if_nlmsg_size(void) 5662 { 5663 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5664 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5665 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5666 + nla_total_size(4) /* IFLA_MTU */ 5667 + nla_total_size(4) /* IFLA_LINK */ 5668 + nla_total_size(1) /* IFLA_OPERSTATE */ 5669 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5670 } 5671 5672 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5673 int bytes) 5674 { 5675 int i; 5676 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5677 BUG_ON(pad < 0); 5678 5679 /* Use put_unaligned() because stats may not be aligned for u64. */ 5680 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5681 for (i = 1; i < ICMP6_MIB_MAX; i++) 5682 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5683 5684 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5685 } 5686 5687 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5688 int bytes, size_t syncpoff) 5689 { 5690 int i, c; 5691 u64 buff[IPSTATS_MIB_MAX]; 5692 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5693 5694 BUG_ON(pad < 0); 5695 5696 memset(buff, 0, sizeof(buff)); 5697 buff[0] = IPSTATS_MIB_MAX; 5698 5699 for_each_possible_cpu(c) { 5700 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5701 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5702 } 5703 5704 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5705 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5706 } 5707 5708 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5709 int bytes) 5710 { 5711 switch (attrtype) { 5712 case IFLA_INET6_STATS: 5713 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5714 offsetof(struct ipstats_mib, syncp)); 5715 break; 5716 case IFLA_INET6_ICMP6STATS: 5717 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5718 break; 5719 } 5720 } 5721 5722 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5723 u32 ext_filter_mask) 5724 { 5725 struct nlattr *nla; 5726 struct ifla_cacheinfo ci; 5727 5728 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5729 goto nla_put_failure; 5730 ci.max_reasm_len = IPV6_MAXPLEN; 5731 ci.tstamp = cstamp_delta(idev->tstamp); 5732 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5733 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5734 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5735 goto nla_put_failure; 5736 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5737 if (!nla) 5738 goto nla_put_failure; 5739 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5740 5741 /* XXX - MC not implemented */ 5742 5743 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5744 return 0; 5745 5746 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5747 if (!nla) 5748 goto nla_put_failure; 5749 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5750 5751 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5752 if (!nla) 5753 goto nla_put_failure; 5754 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5755 5756 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5757 if (!nla) 5758 goto nla_put_failure; 5759 read_lock_bh(&idev->lock); 5760 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5761 read_unlock_bh(&idev->lock); 5762 5763 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5764 goto nla_put_failure; 5765 5766 if (idev->ra_mtu && 5767 nla_put_u32(skb, IFLA_INET6_RA_MTU, idev->ra_mtu)) 5768 goto nla_put_failure; 5769 5770 return 0; 5771 5772 nla_put_failure: 5773 return -EMSGSIZE; 5774 } 5775 5776 static size_t inet6_get_link_af_size(const struct net_device *dev, 5777 u32 ext_filter_mask) 5778 { 5779 if (!__in6_dev_get(dev)) 5780 return 0; 5781 5782 return inet6_ifla6_size(); 5783 } 5784 5785 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5786 u32 ext_filter_mask) 5787 { 5788 struct inet6_dev *idev = __in6_dev_get(dev); 5789 5790 if (!idev) 5791 return -ENODATA; 5792 5793 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5794 return -EMSGSIZE; 5795 5796 return 0; 5797 } 5798 5799 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token, 5800 struct netlink_ext_ack *extack) 5801 { 5802 struct inet6_ifaddr *ifp; 5803 struct net_device *dev = idev->dev; 5804 bool clear_token, update_rs = false; 5805 struct in6_addr ll_addr; 5806 5807 ASSERT_RTNL(); 5808 5809 if (!token) 5810 return -EINVAL; 5811 5812 if (dev->flags & IFF_LOOPBACK) { 5813 NL_SET_ERR_MSG_MOD(extack, "Device is loopback"); 5814 return -EINVAL; 5815 } 5816 5817 if (dev->flags & IFF_NOARP) { 5818 NL_SET_ERR_MSG_MOD(extack, 5819 "Device does not do neighbour discovery"); 5820 return -EINVAL; 5821 } 5822 5823 if (!ipv6_accept_ra(idev)) { 5824 NL_SET_ERR_MSG_MOD(extack, 5825 "Router advertisement is disabled on device"); 5826 return -EINVAL; 5827 } 5828 5829 if (idev->cnf.rtr_solicits == 0) { 5830 NL_SET_ERR_MSG(extack, 5831 "Router solicitation is disabled on device"); 5832 return -EINVAL; 5833 } 5834 5835 write_lock_bh(&idev->lock); 5836 5837 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5838 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5839 5840 write_unlock_bh(&idev->lock); 5841 5842 clear_token = ipv6_addr_any(token); 5843 if (clear_token) 5844 goto update_lft; 5845 5846 if (!idev->dead && (idev->if_flags & IF_READY) && 5847 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5848 IFA_F_OPTIMISTIC)) { 5849 /* If we're not ready, then normal ifup will take care 5850 * of this. Otherwise, we need to request our rs here. 5851 */ 5852 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5853 update_rs = true; 5854 } 5855 5856 update_lft: 5857 write_lock_bh(&idev->lock); 5858 5859 if (update_rs) { 5860 idev->if_flags |= IF_RS_SENT; 5861 idev->rs_interval = rfc3315_s14_backoff_init( 5862 idev->cnf.rtr_solicit_interval); 5863 idev->rs_probes = 1; 5864 addrconf_mod_rs_timer(idev, idev->rs_interval); 5865 } 5866 5867 /* Well, that's kinda nasty ... */ 5868 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5869 spin_lock(&ifp->lock); 5870 if (ifp->tokenized) { 5871 ifp->valid_lft = 0; 5872 ifp->prefered_lft = 0; 5873 } 5874 spin_unlock(&ifp->lock); 5875 } 5876 5877 write_unlock_bh(&idev->lock); 5878 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5879 addrconf_verify_rtnl(dev_net(dev)); 5880 return 0; 5881 } 5882 5883 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5884 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5885 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5886 [IFLA_INET6_RA_MTU] = { .type = NLA_REJECT, 5887 .reject_message = 5888 "IFLA_INET6_RA_MTU can not be set" }, 5889 }; 5890 5891 static int check_addr_gen_mode(int mode) 5892 { 5893 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5894 mode != IN6_ADDR_GEN_MODE_NONE && 5895 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5896 mode != IN6_ADDR_GEN_MODE_RANDOM) 5897 return -EINVAL; 5898 return 1; 5899 } 5900 5901 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5902 int mode) 5903 { 5904 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5905 !idev->cnf.stable_secret.initialized && 5906 !net->ipv6.devconf_dflt->stable_secret.initialized) 5907 return -EINVAL; 5908 return 1; 5909 } 5910 5911 static int inet6_validate_link_af(const struct net_device *dev, 5912 const struct nlattr *nla, 5913 struct netlink_ext_ack *extack) 5914 { 5915 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5916 struct inet6_dev *idev = NULL; 5917 int err; 5918 5919 if (dev) { 5920 idev = __in6_dev_get(dev); 5921 if (!idev) 5922 return -EAFNOSUPPORT; 5923 } 5924 5925 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, 5926 inet6_af_policy, extack); 5927 if (err) 5928 return err; 5929 5930 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE]) 5931 return -EINVAL; 5932 5933 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5934 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5935 5936 if (check_addr_gen_mode(mode) < 0) 5937 return -EINVAL; 5938 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0) 5939 return -EINVAL; 5940 } 5941 5942 return 0; 5943 } 5944 5945 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla, 5946 struct netlink_ext_ack *extack) 5947 { 5948 struct inet6_dev *idev = __in6_dev_get(dev); 5949 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5950 int err; 5951 5952 if (!idev) 5953 return -EAFNOSUPPORT; 5954 5955 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 5956 return -EINVAL; 5957 5958 if (tb[IFLA_INET6_TOKEN]) { 5959 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]), 5960 extack); 5961 if (err) 5962 return err; 5963 } 5964 5965 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5966 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5967 5968 idev->cnf.addr_gen_mode = mode; 5969 } 5970 5971 return 0; 5972 } 5973 5974 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5975 u32 portid, u32 seq, int event, unsigned int flags) 5976 { 5977 struct net_device *dev = idev->dev; 5978 struct ifinfomsg *hdr; 5979 struct nlmsghdr *nlh; 5980 void *protoinfo; 5981 5982 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5983 if (!nlh) 5984 return -EMSGSIZE; 5985 5986 hdr = nlmsg_data(nlh); 5987 hdr->ifi_family = AF_INET6; 5988 hdr->__ifi_pad = 0; 5989 hdr->ifi_type = dev->type; 5990 hdr->ifi_index = dev->ifindex; 5991 hdr->ifi_flags = dev_get_flags(dev); 5992 hdr->ifi_change = 0; 5993 5994 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5995 (dev->addr_len && 5996 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5997 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5998 (dev->ifindex != dev_get_iflink(dev) && 5999 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 6000 nla_put_u8(skb, IFLA_OPERSTATE, 6001 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 6002 goto nla_put_failure; 6003 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO); 6004 if (!protoinfo) 6005 goto nla_put_failure; 6006 6007 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 6008 goto nla_put_failure; 6009 6010 nla_nest_end(skb, protoinfo); 6011 nlmsg_end(skb, nlh); 6012 return 0; 6013 6014 nla_put_failure: 6015 nlmsg_cancel(skb, nlh); 6016 return -EMSGSIZE; 6017 } 6018 6019 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh, 6020 struct netlink_ext_ack *extack) 6021 { 6022 struct ifinfomsg *ifm; 6023 6024 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 6025 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request"); 6026 return -EINVAL; 6027 } 6028 6029 if (nlmsg_attrlen(nlh, sizeof(*ifm))) { 6030 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header"); 6031 return -EINVAL; 6032 } 6033 6034 ifm = nlmsg_data(nlh); 6035 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || 6036 ifm->ifi_change || ifm->ifi_index) { 6037 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request"); 6038 return -EINVAL; 6039 } 6040 6041 return 0; 6042 } 6043 6044 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 6045 { 6046 struct net *net = sock_net(skb->sk); 6047 int h, s_h; 6048 int idx = 0, s_idx; 6049 struct net_device *dev; 6050 struct inet6_dev *idev; 6051 struct hlist_head *head; 6052 6053 /* only requests using strict checking can pass data to 6054 * influence the dump 6055 */ 6056 if (cb->strict_check) { 6057 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack); 6058 6059 if (err < 0) 6060 return err; 6061 } 6062 6063 s_h = cb->args[0]; 6064 s_idx = cb->args[1]; 6065 6066 rcu_read_lock(); 6067 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 6068 idx = 0; 6069 head = &net->dev_index_head[h]; 6070 hlist_for_each_entry_rcu(dev, head, index_hlist) { 6071 if (idx < s_idx) 6072 goto cont; 6073 idev = __in6_dev_get(dev); 6074 if (!idev) 6075 goto cont; 6076 if (inet6_fill_ifinfo(skb, idev, 6077 NETLINK_CB(cb->skb).portid, 6078 cb->nlh->nlmsg_seq, 6079 RTM_NEWLINK, NLM_F_MULTI) < 0) 6080 goto out; 6081 cont: 6082 idx++; 6083 } 6084 } 6085 out: 6086 rcu_read_unlock(); 6087 cb->args[1] = idx; 6088 cb->args[0] = h; 6089 6090 return skb->len; 6091 } 6092 6093 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 6094 { 6095 struct sk_buff *skb; 6096 struct net *net = dev_net(idev->dev); 6097 int err = -ENOBUFS; 6098 6099 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 6100 if (!skb) 6101 goto errout; 6102 6103 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 6104 if (err < 0) { 6105 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 6106 WARN_ON(err == -EMSGSIZE); 6107 kfree_skb(skb); 6108 goto errout; 6109 } 6110 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 6111 return; 6112 errout: 6113 if (err < 0) 6114 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 6115 } 6116 6117 static inline size_t inet6_prefix_nlmsg_size(void) 6118 { 6119 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 6120 + nla_total_size(sizeof(struct in6_addr)) 6121 + nla_total_size(sizeof(struct prefix_cacheinfo)); 6122 } 6123 6124 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 6125 struct prefix_info *pinfo, u32 portid, u32 seq, 6126 int event, unsigned int flags) 6127 { 6128 struct prefixmsg *pmsg; 6129 struct nlmsghdr *nlh; 6130 struct prefix_cacheinfo ci; 6131 6132 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 6133 if (!nlh) 6134 return -EMSGSIZE; 6135 6136 pmsg = nlmsg_data(nlh); 6137 pmsg->prefix_family = AF_INET6; 6138 pmsg->prefix_pad1 = 0; 6139 pmsg->prefix_pad2 = 0; 6140 pmsg->prefix_ifindex = idev->dev->ifindex; 6141 pmsg->prefix_len = pinfo->prefix_len; 6142 pmsg->prefix_type = pinfo->type; 6143 pmsg->prefix_pad3 = 0; 6144 pmsg->prefix_flags = pinfo->flags; 6145 6146 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 6147 goto nla_put_failure; 6148 ci.preferred_time = ntohl(pinfo->prefered); 6149 ci.valid_time = ntohl(pinfo->valid); 6150 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 6151 goto nla_put_failure; 6152 nlmsg_end(skb, nlh); 6153 return 0; 6154 6155 nla_put_failure: 6156 nlmsg_cancel(skb, nlh); 6157 return -EMSGSIZE; 6158 } 6159 6160 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 6161 struct prefix_info *pinfo) 6162 { 6163 struct sk_buff *skb; 6164 struct net *net = dev_net(idev->dev); 6165 int err = -ENOBUFS; 6166 6167 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 6168 if (!skb) 6169 goto errout; 6170 6171 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 6172 if (err < 0) { 6173 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 6174 WARN_ON(err == -EMSGSIZE); 6175 kfree_skb(skb); 6176 goto errout; 6177 } 6178 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 6179 return; 6180 errout: 6181 if (err < 0) 6182 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 6183 } 6184 6185 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6186 { 6187 struct net *net = dev_net(ifp->idev->dev); 6188 6189 if (event) 6190 ASSERT_RTNL(); 6191 6192 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 6193 6194 switch (event) { 6195 case RTM_NEWADDR: 6196 /* 6197 * If the address was optimistic we inserted the route at the 6198 * start of our DAD process, so we don't need to do it again. 6199 * If the device was taken down in the middle of the DAD 6200 * cycle there is a race where we could get here without a 6201 * host route, so nothing to insert. That will be fixed when 6202 * the device is brought up. 6203 */ 6204 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) { 6205 ip6_ins_rt(net, ifp->rt); 6206 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) { 6207 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n", 6208 &ifp->addr, ifp->idev->dev->name); 6209 } 6210 6211 if (ifp->idev->cnf.forwarding) 6212 addrconf_join_anycast(ifp); 6213 if (!ipv6_addr_any(&ifp->peer_addr)) 6214 addrconf_prefix_route(&ifp->peer_addr, 128, 6215 ifp->rt_priority, ifp->idev->dev, 6216 0, 0, GFP_ATOMIC); 6217 break; 6218 case RTM_DELADDR: 6219 if (ifp->idev->cnf.forwarding) 6220 addrconf_leave_anycast(ifp); 6221 addrconf_leave_solict(ifp->idev, &ifp->addr); 6222 if (!ipv6_addr_any(&ifp->peer_addr)) { 6223 struct fib6_info *rt; 6224 6225 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 6226 ifp->idev->dev, 0, 0, 6227 false); 6228 if (rt) 6229 ip6_del_rt(net, rt, false); 6230 } 6231 if (ifp->rt) { 6232 ip6_del_rt(net, ifp->rt, false); 6233 ifp->rt = NULL; 6234 } 6235 rt_genid_bump_ipv6(net); 6236 break; 6237 } 6238 atomic_inc(&net->ipv6.dev_addr_genid); 6239 } 6240 6241 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6242 { 6243 if (likely(ifp->idev->dead == 0)) 6244 __ipv6_ifa_notify(event, ifp); 6245 } 6246 6247 #ifdef CONFIG_SYSCTL 6248 6249 static int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 6250 void *buffer, size_t *lenp, loff_t *ppos) 6251 { 6252 int *valp = ctl->data; 6253 int val = *valp; 6254 loff_t pos = *ppos; 6255 struct ctl_table lctl; 6256 int ret; 6257 6258 /* 6259 * ctl->data points to idev->cnf.forwarding, we should 6260 * not modify it until we get the rtnl lock. 6261 */ 6262 lctl = *ctl; 6263 lctl.data = &val; 6264 6265 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6266 6267 if (write) 6268 ret = addrconf_fixup_forwarding(ctl, valp, val); 6269 if (ret) 6270 *ppos = pos; 6271 return ret; 6272 } 6273 6274 static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 6275 void *buffer, size_t *lenp, loff_t *ppos) 6276 { 6277 struct inet6_dev *idev = ctl->extra1; 6278 int min_mtu = IPV6_MIN_MTU; 6279 struct ctl_table lctl; 6280 6281 lctl = *ctl; 6282 lctl.extra1 = &min_mtu; 6283 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 6284 6285 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 6286 } 6287 6288 static void dev_disable_change(struct inet6_dev *idev) 6289 { 6290 struct netdev_notifier_info info; 6291 6292 if (!idev || !idev->dev) 6293 return; 6294 6295 netdev_notifier_info_init(&info, idev->dev); 6296 if (idev->cnf.disable_ipv6) 6297 addrconf_notify(NULL, NETDEV_DOWN, &info); 6298 else 6299 addrconf_notify(NULL, NETDEV_UP, &info); 6300 } 6301 6302 static void addrconf_disable_change(struct net *net, __s32 newf) 6303 { 6304 struct net_device *dev; 6305 struct inet6_dev *idev; 6306 6307 for_each_netdev(net, dev) { 6308 idev = __in6_dev_get(dev); 6309 if (idev) { 6310 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 6311 idev->cnf.disable_ipv6 = newf; 6312 if (changed) 6313 dev_disable_change(idev); 6314 } 6315 } 6316 } 6317 6318 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 6319 { 6320 struct net *net; 6321 int old; 6322 6323 if (!rtnl_trylock()) 6324 return restart_syscall(); 6325 6326 net = (struct net *)table->extra2; 6327 old = *p; 6328 *p = newf; 6329 6330 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 6331 rtnl_unlock(); 6332 return 0; 6333 } 6334 6335 if (p == &net->ipv6.devconf_all->disable_ipv6) { 6336 net->ipv6.devconf_dflt->disable_ipv6 = newf; 6337 addrconf_disable_change(net, newf); 6338 } else if ((!newf) ^ (!old)) 6339 dev_disable_change((struct inet6_dev *)table->extra1); 6340 6341 rtnl_unlock(); 6342 return 0; 6343 } 6344 6345 static int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 6346 void *buffer, size_t *lenp, loff_t *ppos) 6347 { 6348 int *valp = ctl->data; 6349 int val = *valp; 6350 loff_t pos = *ppos; 6351 struct ctl_table lctl; 6352 int ret; 6353 6354 /* 6355 * ctl->data points to idev->cnf.disable_ipv6, we should 6356 * not modify it until we get the rtnl lock. 6357 */ 6358 lctl = *ctl; 6359 lctl.data = &val; 6360 6361 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6362 6363 if (write) 6364 ret = addrconf_disable_ipv6(ctl, valp, val); 6365 if (ret) 6366 *ppos = pos; 6367 return ret; 6368 } 6369 6370 static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 6371 void *buffer, size_t *lenp, loff_t *ppos) 6372 { 6373 int *valp = ctl->data; 6374 int ret; 6375 int old, new; 6376 6377 old = *valp; 6378 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 6379 new = *valp; 6380 6381 if (write && old != new) { 6382 struct net *net = ctl->extra2; 6383 6384 if (!rtnl_trylock()) 6385 return restart_syscall(); 6386 6387 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 6388 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6389 NETCONFA_PROXY_NEIGH, 6390 NETCONFA_IFINDEX_DEFAULT, 6391 net->ipv6.devconf_dflt); 6392 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 6393 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6394 NETCONFA_PROXY_NEIGH, 6395 NETCONFA_IFINDEX_ALL, 6396 net->ipv6.devconf_all); 6397 else { 6398 struct inet6_dev *idev = ctl->extra1; 6399 6400 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6401 NETCONFA_PROXY_NEIGH, 6402 idev->dev->ifindex, 6403 &idev->cnf); 6404 } 6405 rtnl_unlock(); 6406 } 6407 6408 return ret; 6409 } 6410 6411 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 6412 void *buffer, size_t *lenp, 6413 loff_t *ppos) 6414 { 6415 int ret = 0; 6416 u32 new_val; 6417 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 6418 struct net *net = (struct net *)ctl->extra2; 6419 struct ctl_table tmp = { 6420 .data = &new_val, 6421 .maxlen = sizeof(new_val), 6422 .mode = ctl->mode, 6423 }; 6424 6425 if (!rtnl_trylock()) 6426 return restart_syscall(); 6427 6428 new_val = *((u32 *)ctl->data); 6429 6430 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos); 6431 if (ret != 0) 6432 goto out; 6433 6434 if (write) { 6435 if (check_addr_gen_mode(new_val) < 0) { 6436 ret = -EINVAL; 6437 goto out; 6438 } 6439 6440 if (idev) { 6441 if (check_stable_privacy(idev, net, new_val) < 0) { 6442 ret = -EINVAL; 6443 goto out; 6444 } 6445 6446 if (idev->cnf.addr_gen_mode != new_val) { 6447 idev->cnf.addr_gen_mode = new_val; 6448 addrconf_init_auto_addrs(idev->dev); 6449 } 6450 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) { 6451 struct net_device *dev; 6452 6453 net->ipv6.devconf_dflt->addr_gen_mode = new_val; 6454 for_each_netdev(net, dev) { 6455 idev = __in6_dev_get(dev); 6456 if (idev && 6457 idev->cnf.addr_gen_mode != new_val) { 6458 idev->cnf.addr_gen_mode = new_val; 6459 addrconf_init_auto_addrs(idev->dev); 6460 } 6461 } 6462 } 6463 6464 *((u32 *)ctl->data) = new_val; 6465 } 6466 6467 out: 6468 rtnl_unlock(); 6469 6470 return ret; 6471 } 6472 6473 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 6474 void *buffer, size_t *lenp, 6475 loff_t *ppos) 6476 { 6477 int err; 6478 struct in6_addr addr; 6479 char str[IPV6_MAX_STRLEN]; 6480 struct ctl_table lctl = *ctl; 6481 struct net *net = ctl->extra2; 6482 struct ipv6_stable_secret *secret = ctl->data; 6483 6484 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 6485 return -EIO; 6486 6487 lctl.maxlen = IPV6_MAX_STRLEN; 6488 lctl.data = str; 6489 6490 if (!rtnl_trylock()) 6491 return restart_syscall(); 6492 6493 if (!write && !secret->initialized) { 6494 err = -EIO; 6495 goto out; 6496 } 6497 6498 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 6499 if (err >= sizeof(str)) { 6500 err = -EIO; 6501 goto out; 6502 } 6503 6504 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 6505 if (err || !write) 6506 goto out; 6507 6508 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 6509 err = -EIO; 6510 goto out; 6511 } 6512 6513 secret->initialized = true; 6514 secret->secret = addr; 6515 6516 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 6517 struct net_device *dev; 6518 6519 for_each_netdev(net, dev) { 6520 struct inet6_dev *idev = __in6_dev_get(dev); 6521 6522 if (idev) { 6523 idev->cnf.addr_gen_mode = 6524 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6525 } 6526 } 6527 } else { 6528 struct inet6_dev *idev = ctl->extra1; 6529 6530 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6531 } 6532 6533 out: 6534 rtnl_unlock(); 6535 6536 return err; 6537 } 6538 6539 static 6540 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 6541 int write, void *buffer, 6542 size_t *lenp, 6543 loff_t *ppos) 6544 { 6545 int *valp = ctl->data; 6546 int val = *valp; 6547 loff_t pos = *ppos; 6548 struct ctl_table lctl; 6549 int ret; 6550 6551 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 6552 * we should not modify it until we get the rtnl lock. 6553 */ 6554 lctl = *ctl; 6555 lctl.data = &val; 6556 6557 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6558 6559 if (write) 6560 ret = addrconf_fixup_linkdown(ctl, valp, val); 6561 if (ret) 6562 *ppos = pos; 6563 return ret; 6564 } 6565 6566 static 6567 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 6568 { 6569 if (rt) { 6570 if (action) 6571 rt->dst.flags |= DST_NOPOLICY; 6572 else 6573 rt->dst.flags &= ~DST_NOPOLICY; 6574 } 6575 } 6576 6577 static 6578 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 6579 { 6580 struct inet6_ifaddr *ifa; 6581 6582 read_lock_bh(&idev->lock); 6583 list_for_each_entry(ifa, &idev->addr_list, if_list) { 6584 spin_lock(&ifa->lock); 6585 if (ifa->rt) { 6586 /* host routes only use builtin fib6_nh */ 6587 struct fib6_nh *nh = ifa->rt->fib6_nh; 6588 int cpu; 6589 6590 rcu_read_lock(); 6591 ifa->rt->dst_nopolicy = val ? true : false; 6592 if (nh->rt6i_pcpu) { 6593 for_each_possible_cpu(cpu) { 6594 struct rt6_info **rtp; 6595 6596 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu); 6597 addrconf_set_nopolicy(*rtp, val); 6598 } 6599 } 6600 rcu_read_unlock(); 6601 } 6602 spin_unlock(&ifa->lock); 6603 } 6604 read_unlock_bh(&idev->lock); 6605 } 6606 6607 static 6608 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 6609 { 6610 struct inet6_dev *idev; 6611 struct net *net; 6612 6613 if (!rtnl_trylock()) 6614 return restart_syscall(); 6615 6616 *valp = val; 6617 6618 net = (struct net *)ctl->extra2; 6619 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 6620 rtnl_unlock(); 6621 return 0; 6622 } 6623 6624 if (valp == &net->ipv6.devconf_all->disable_policy) { 6625 struct net_device *dev; 6626 6627 for_each_netdev(net, dev) { 6628 idev = __in6_dev_get(dev); 6629 if (idev) 6630 addrconf_disable_policy_idev(idev, val); 6631 } 6632 } else { 6633 idev = (struct inet6_dev *)ctl->extra1; 6634 addrconf_disable_policy_idev(idev, val); 6635 } 6636 6637 rtnl_unlock(); 6638 return 0; 6639 } 6640 6641 static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 6642 void *buffer, size_t *lenp, loff_t *ppos) 6643 { 6644 int *valp = ctl->data; 6645 int val = *valp; 6646 loff_t pos = *ppos; 6647 struct ctl_table lctl; 6648 int ret; 6649 6650 lctl = *ctl; 6651 lctl.data = &val; 6652 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6653 6654 if (write && (*valp != val)) 6655 ret = addrconf_disable_policy(ctl, valp, val); 6656 6657 if (ret) 6658 *ppos = pos; 6659 6660 return ret; 6661 } 6662 6663 static int minus_one = -1; 6664 static const int two_five_five = 255; 6665 static u32 ioam6_if_id_max = U16_MAX; 6666 6667 static const struct ctl_table addrconf_sysctl[] = { 6668 { 6669 .procname = "forwarding", 6670 .data = &ipv6_devconf.forwarding, 6671 .maxlen = sizeof(int), 6672 .mode = 0644, 6673 .proc_handler = addrconf_sysctl_forward, 6674 }, 6675 { 6676 .procname = "hop_limit", 6677 .data = &ipv6_devconf.hop_limit, 6678 .maxlen = sizeof(int), 6679 .mode = 0644, 6680 .proc_handler = proc_dointvec_minmax, 6681 .extra1 = (void *)SYSCTL_ONE, 6682 .extra2 = (void *)&two_five_five, 6683 }, 6684 { 6685 .procname = "mtu", 6686 .data = &ipv6_devconf.mtu6, 6687 .maxlen = sizeof(int), 6688 .mode = 0644, 6689 .proc_handler = addrconf_sysctl_mtu, 6690 }, 6691 { 6692 .procname = "accept_ra", 6693 .data = &ipv6_devconf.accept_ra, 6694 .maxlen = sizeof(int), 6695 .mode = 0644, 6696 .proc_handler = proc_dointvec, 6697 }, 6698 { 6699 .procname = "accept_redirects", 6700 .data = &ipv6_devconf.accept_redirects, 6701 .maxlen = sizeof(int), 6702 .mode = 0644, 6703 .proc_handler = proc_dointvec, 6704 }, 6705 { 6706 .procname = "autoconf", 6707 .data = &ipv6_devconf.autoconf, 6708 .maxlen = sizeof(int), 6709 .mode = 0644, 6710 .proc_handler = proc_dointvec, 6711 }, 6712 { 6713 .procname = "dad_transmits", 6714 .data = &ipv6_devconf.dad_transmits, 6715 .maxlen = sizeof(int), 6716 .mode = 0644, 6717 .proc_handler = proc_dointvec, 6718 }, 6719 { 6720 .procname = "router_solicitations", 6721 .data = &ipv6_devconf.rtr_solicits, 6722 .maxlen = sizeof(int), 6723 .mode = 0644, 6724 .proc_handler = proc_dointvec_minmax, 6725 .extra1 = &minus_one, 6726 }, 6727 { 6728 .procname = "router_solicitation_interval", 6729 .data = &ipv6_devconf.rtr_solicit_interval, 6730 .maxlen = sizeof(int), 6731 .mode = 0644, 6732 .proc_handler = proc_dointvec_jiffies, 6733 }, 6734 { 6735 .procname = "router_solicitation_max_interval", 6736 .data = &ipv6_devconf.rtr_solicit_max_interval, 6737 .maxlen = sizeof(int), 6738 .mode = 0644, 6739 .proc_handler = proc_dointvec_jiffies, 6740 }, 6741 { 6742 .procname = "router_solicitation_delay", 6743 .data = &ipv6_devconf.rtr_solicit_delay, 6744 .maxlen = sizeof(int), 6745 .mode = 0644, 6746 .proc_handler = proc_dointvec_jiffies, 6747 }, 6748 { 6749 .procname = "force_mld_version", 6750 .data = &ipv6_devconf.force_mld_version, 6751 .maxlen = sizeof(int), 6752 .mode = 0644, 6753 .proc_handler = proc_dointvec, 6754 }, 6755 { 6756 .procname = "mldv1_unsolicited_report_interval", 6757 .data = 6758 &ipv6_devconf.mldv1_unsolicited_report_interval, 6759 .maxlen = sizeof(int), 6760 .mode = 0644, 6761 .proc_handler = proc_dointvec_ms_jiffies, 6762 }, 6763 { 6764 .procname = "mldv2_unsolicited_report_interval", 6765 .data = 6766 &ipv6_devconf.mldv2_unsolicited_report_interval, 6767 .maxlen = sizeof(int), 6768 .mode = 0644, 6769 .proc_handler = proc_dointvec_ms_jiffies, 6770 }, 6771 { 6772 .procname = "use_tempaddr", 6773 .data = &ipv6_devconf.use_tempaddr, 6774 .maxlen = sizeof(int), 6775 .mode = 0644, 6776 .proc_handler = proc_dointvec, 6777 }, 6778 { 6779 .procname = "temp_valid_lft", 6780 .data = &ipv6_devconf.temp_valid_lft, 6781 .maxlen = sizeof(int), 6782 .mode = 0644, 6783 .proc_handler = proc_dointvec, 6784 }, 6785 { 6786 .procname = "temp_prefered_lft", 6787 .data = &ipv6_devconf.temp_prefered_lft, 6788 .maxlen = sizeof(int), 6789 .mode = 0644, 6790 .proc_handler = proc_dointvec, 6791 }, 6792 { 6793 .procname = "regen_max_retry", 6794 .data = &ipv6_devconf.regen_max_retry, 6795 .maxlen = sizeof(int), 6796 .mode = 0644, 6797 .proc_handler = proc_dointvec, 6798 }, 6799 { 6800 .procname = "max_desync_factor", 6801 .data = &ipv6_devconf.max_desync_factor, 6802 .maxlen = sizeof(int), 6803 .mode = 0644, 6804 .proc_handler = proc_dointvec, 6805 }, 6806 { 6807 .procname = "max_addresses", 6808 .data = &ipv6_devconf.max_addresses, 6809 .maxlen = sizeof(int), 6810 .mode = 0644, 6811 .proc_handler = proc_dointvec, 6812 }, 6813 { 6814 .procname = "accept_ra_defrtr", 6815 .data = &ipv6_devconf.accept_ra_defrtr, 6816 .maxlen = sizeof(int), 6817 .mode = 0644, 6818 .proc_handler = proc_dointvec, 6819 }, 6820 { 6821 .procname = "ra_defrtr_metric", 6822 .data = &ipv6_devconf.ra_defrtr_metric, 6823 .maxlen = sizeof(u32), 6824 .mode = 0644, 6825 .proc_handler = proc_douintvec_minmax, 6826 .extra1 = (void *)SYSCTL_ONE, 6827 }, 6828 { 6829 .procname = "accept_ra_min_hop_limit", 6830 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6831 .maxlen = sizeof(int), 6832 .mode = 0644, 6833 .proc_handler = proc_dointvec, 6834 }, 6835 { 6836 .procname = "accept_ra_min_lft", 6837 .data = &ipv6_devconf.accept_ra_min_lft, 6838 .maxlen = sizeof(int), 6839 .mode = 0644, 6840 .proc_handler = proc_dointvec, 6841 }, 6842 { 6843 .procname = "accept_ra_pinfo", 6844 .data = &ipv6_devconf.accept_ra_pinfo, 6845 .maxlen = sizeof(int), 6846 .mode = 0644, 6847 .proc_handler = proc_dointvec, 6848 }, 6849 { 6850 .procname = "ra_honor_pio_life", 6851 .data = &ipv6_devconf.ra_honor_pio_life, 6852 .maxlen = sizeof(u8), 6853 .mode = 0644, 6854 .proc_handler = proc_dou8vec_minmax, 6855 .extra1 = SYSCTL_ZERO, 6856 .extra2 = SYSCTL_ONE, 6857 }, 6858 #ifdef CONFIG_IPV6_ROUTER_PREF 6859 { 6860 .procname = "accept_ra_rtr_pref", 6861 .data = &ipv6_devconf.accept_ra_rtr_pref, 6862 .maxlen = sizeof(int), 6863 .mode = 0644, 6864 .proc_handler = proc_dointvec, 6865 }, 6866 { 6867 .procname = "router_probe_interval", 6868 .data = &ipv6_devconf.rtr_probe_interval, 6869 .maxlen = sizeof(int), 6870 .mode = 0644, 6871 .proc_handler = proc_dointvec_jiffies, 6872 }, 6873 #ifdef CONFIG_IPV6_ROUTE_INFO 6874 { 6875 .procname = "accept_ra_rt_info_min_plen", 6876 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6877 .maxlen = sizeof(int), 6878 .mode = 0644, 6879 .proc_handler = proc_dointvec, 6880 }, 6881 { 6882 .procname = "accept_ra_rt_info_max_plen", 6883 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6884 .maxlen = sizeof(int), 6885 .mode = 0644, 6886 .proc_handler = proc_dointvec, 6887 }, 6888 #endif 6889 #endif 6890 { 6891 .procname = "proxy_ndp", 6892 .data = &ipv6_devconf.proxy_ndp, 6893 .maxlen = sizeof(int), 6894 .mode = 0644, 6895 .proc_handler = addrconf_sysctl_proxy_ndp, 6896 }, 6897 { 6898 .procname = "accept_source_route", 6899 .data = &ipv6_devconf.accept_source_route, 6900 .maxlen = sizeof(int), 6901 .mode = 0644, 6902 .proc_handler = proc_dointvec, 6903 }, 6904 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6905 { 6906 .procname = "optimistic_dad", 6907 .data = &ipv6_devconf.optimistic_dad, 6908 .maxlen = sizeof(int), 6909 .mode = 0644, 6910 .proc_handler = proc_dointvec, 6911 }, 6912 { 6913 .procname = "use_optimistic", 6914 .data = &ipv6_devconf.use_optimistic, 6915 .maxlen = sizeof(int), 6916 .mode = 0644, 6917 .proc_handler = proc_dointvec, 6918 }, 6919 #endif 6920 #ifdef CONFIG_IPV6_MROUTE 6921 { 6922 .procname = "mc_forwarding", 6923 .data = &ipv6_devconf.mc_forwarding, 6924 .maxlen = sizeof(int), 6925 .mode = 0444, 6926 .proc_handler = proc_dointvec, 6927 }, 6928 #endif 6929 { 6930 .procname = "disable_ipv6", 6931 .data = &ipv6_devconf.disable_ipv6, 6932 .maxlen = sizeof(int), 6933 .mode = 0644, 6934 .proc_handler = addrconf_sysctl_disable, 6935 }, 6936 { 6937 .procname = "accept_dad", 6938 .data = &ipv6_devconf.accept_dad, 6939 .maxlen = sizeof(int), 6940 .mode = 0644, 6941 .proc_handler = proc_dointvec, 6942 }, 6943 { 6944 .procname = "force_tllao", 6945 .data = &ipv6_devconf.force_tllao, 6946 .maxlen = sizeof(int), 6947 .mode = 0644, 6948 .proc_handler = proc_dointvec 6949 }, 6950 { 6951 .procname = "ndisc_notify", 6952 .data = &ipv6_devconf.ndisc_notify, 6953 .maxlen = sizeof(int), 6954 .mode = 0644, 6955 .proc_handler = proc_dointvec 6956 }, 6957 { 6958 .procname = "suppress_frag_ndisc", 6959 .data = &ipv6_devconf.suppress_frag_ndisc, 6960 .maxlen = sizeof(int), 6961 .mode = 0644, 6962 .proc_handler = proc_dointvec 6963 }, 6964 { 6965 .procname = "accept_ra_from_local", 6966 .data = &ipv6_devconf.accept_ra_from_local, 6967 .maxlen = sizeof(int), 6968 .mode = 0644, 6969 .proc_handler = proc_dointvec, 6970 }, 6971 { 6972 .procname = "accept_ra_mtu", 6973 .data = &ipv6_devconf.accept_ra_mtu, 6974 .maxlen = sizeof(int), 6975 .mode = 0644, 6976 .proc_handler = proc_dointvec, 6977 }, 6978 { 6979 .procname = "stable_secret", 6980 .data = &ipv6_devconf.stable_secret, 6981 .maxlen = IPV6_MAX_STRLEN, 6982 .mode = 0600, 6983 .proc_handler = addrconf_sysctl_stable_secret, 6984 }, 6985 { 6986 .procname = "use_oif_addrs_only", 6987 .data = &ipv6_devconf.use_oif_addrs_only, 6988 .maxlen = sizeof(int), 6989 .mode = 0644, 6990 .proc_handler = proc_dointvec, 6991 }, 6992 { 6993 .procname = "ignore_routes_with_linkdown", 6994 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6995 .maxlen = sizeof(int), 6996 .mode = 0644, 6997 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6998 }, 6999 { 7000 .procname = "drop_unicast_in_l2_multicast", 7001 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 7002 .maxlen = sizeof(int), 7003 .mode = 0644, 7004 .proc_handler = proc_dointvec, 7005 }, 7006 { 7007 .procname = "drop_unsolicited_na", 7008 .data = &ipv6_devconf.drop_unsolicited_na, 7009 .maxlen = sizeof(int), 7010 .mode = 0644, 7011 .proc_handler = proc_dointvec, 7012 }, 7013 { 7014 .procname = "keep_addr_on_down", 7015 .data = &ipv6_devconf.keep_addr_on_down, 7016 .maxlen = sizeof(int), 7017 .mode = 0644, 7018 .proc_handler = proc_dointvec, 7019 7020 }, 7021 { 7022 .procname = "seg6_enabled", 7023 .data = &ipv6_devconf.seg6_enabled, 7024 .maxlen = sizeof(int), 7025 .mode = 0644, 7026 .proc_handler = proc_dointvec, 7027 }, 7028 #ifdef CONFIG_IPV6_SEG6_HMAC 7029 { 7030 .procname = "seg6_require_hmac", 7031 .data = &ipv6_devconf.seg6_require_hmac, 7032 .maxlen = sizeof(int), 7033 .mode = 0644, 7034 .proc_handler = proc_dointvec, 7035 }, 7036 #endif 7037 { 7038 .procname = "enhanced_dad", 7039 .data = &ipv6_devconf.enhanced_dad, 7040 .maxlen = sizeof(int), 7041 .mode = 0644, 7042 .proc_handler = proc_dointvec, 7043 }, 7044 { 7045 .procname = "addr_gen_mode", 7046 .data = &ipv6_devconf.addr_gen_mode, 7047 .maxlen = sizeof(int), 7048 .mode = 0644, 7049 .proc_handler = addrconf_sysctl_addr_gen_mode, 7050 }, 7051 { 7052 .procname = "disable_policy", 7053 .data = &ipv6_devconf.disable_policy, 7054 .maxlen = sizeof(int), 7055 .mode = 0644, 7056 .proc_handler = addrconf_sysctl_disable_policy, 7057 }, 7058 { 7059 .procname = "ndisc_tclass", 7060 .data = &ipv6_devconf.ndisc_tclass, 7061 .maxlen = sizeof(int), 7062 .mode = 0644, 7063 .proc_handler = proc_dointvec_minmax, 7064 .extra1 = (void *)SYSCTL_ZERO, 7065 .extra2 = (void *)&two_five_five, 7066 }, 7067 { 7068 .procname = "rpl_seg_enabled", 7069 .data = &ipv6_devconf.rpl_seg_enabled, 7070 .maxlen = sizeof(int), 7071 .mode = 0644, 7072 .proc_handler = proc_dointvec, 7073 }, 7074 { 7075 .procname = "ioam6_enabled", 7076 .data = &ipv6_devconf.ioam6_enabled, 7077 .maxlen = sizeof(u8), 7078 .mode = 0644, 7079 .proc_handler = proc_dou8vec_minmax, 7080 .extra1 = (void *)SYSCTL_ZERO, 7081 .extra2 = (void *)SYSCTL_ONE, 7082 }, 7083 { 7084 .procname = "ioam6_id", 7085 .data = &ipv6_devconf.ioam6_id, 7086 .maxlen = sizeof(u32), 7087 .mode = 0644, 7088 .proc_handler = proc_douintvec_minmax, 7089 .extra1 = (void *)SYSCTL_ZERO, 7090 .extra2 = (void *)&ioam6_if_id_max, 7091 }, 7092 { 7093 .procname = "ioam6_id_wide", 7094 .data = &ipv6_devconf.ioam6_id_wide, 7095 .maxlen = sizeof(u32), 7096 .mode = 0644, 7097 .proc_handler = proc_douintvec, 7098 }, 7099 { 7100 .procname = "ndisc_evict_nocarrier", 7101 .data = &ipv6_devconf.ndisc_evict_nocarrier, 7102 .maxlen = sizeof(u8), 7103 .mode = 0644, 7104 .proc_handler = proc_dou8vec_minmax, 7105 .extra1 = (void *)SYSCTL_ZERO, 7106 .extra2 = (void *)SYSCTL_ONE, 7107 }, 7108 { 7109 .procname = "accept_untracked_na", 7110 .data = &ipv6_devconf.accept_untracked_na, 7111 .maxlen = sizeof(int), 7112 .mode = 0644, 7113 .proc_handler = proc_dointvec_minmax, 7114 .extra1 = SYSCTL_ZERO, 7115 .extra2 = SYSCTL_TWO, 7116 }, 7117 { 7118 /* sentinel */ 7119 } 7120 }; 7121 7122 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 7123 struct inet6_dev *idev, struct ipv6_devconf *p) 7124 { 7125 int i, ifindex; 7126 struct ctl_table *table; 7127 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 7128 7129 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL_ACCOUNT); 7130 if (!table) 7131 goto out; 7132 7133 for (i = 0; table[i].data; i++) { 7134 table[i].data += (char *)p - (char *)&ipv6_devconf; 7135 /* If one of these is already set, then it is not safe to 7136 * overwrite either of them: this makes proc_dointvec_minmax 7137 * usable. 7138 */ 7139 if (!table[i].extra1 && !table[i].extra2) { 7140 table[i].extra1 = idev; /* embedded; no ref */ 7141 table[i].extra2 = net; 7142 } 7143 } 7144 7145 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 7146 7147 p->sysctl_header = register_net_sysctl_sz(net, path, table, 7148 ARRAY_SIZE(addrconf_sysctl)); 7149 if (!p->sysctl_header) 7150 goto free; 7151 7152 if (!strcmp(dev_name, "all")) 7153 ifindex = NETCONFA_IFINDEX_ALL; 7154 else if (!strcmp(dev_name, "default")) 7155 ifindex = NETCONFA_IFINDEX_DEFAULT; 7156 else 7157 ifindex = idev->dev->ifindex; 7158 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 7159 ifindex, p); 7160 return 0; 7161 7162 free: 7163 kfree(table); 7164 out: 7165 return -ENOBUFS; 7166 } 7167 7168 static void __addrconf_sysctl_unregister(struct net *net, 7169 struct ipv6_devconf *p, int ifindex) 7170 { 7171 struct ctl_table *table; 7172 7173 if (!p->sysctl_header) 7174 return; 7175 7176 table = p->sysctl_header->ctl_table_arg; 7177 unregister_net_sysctl_table(p->sysctl_header); 7178 p->sysctl_header = NULL; 7179 kfree(table); 7180 7181 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 7182 } 7183 7184 static int addrconf_sysctl_register(struct inet6_dev *idev) 7185 { 7186 int err; 7187 7188 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 7189 return -EINVAL; 7190 7191 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 7192 &ndisc_ifinfo_sysctl_change); 7193 if (err) 7194 return err; 7195 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 7196 idev, &idev->cnf); 7197 if (err) 7198 neigh_sysctl_unregister(idev->nd_parms); 7199 7200 return err; 7201 } 7202 7203 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 7204 { 7205 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 7206 idev->dev->ifindex); 7207 neigh_sysctl_unregister(idev->nd_parms); 7208 } 7209 7210 7211 #endif 7212 7213 static int __net_init addrconf_init_net(struct net *net) 7214 { 7215 int err = -ENOMEM; 7216 struct ipv6_devconf *all, *dflt; 7217 7218 spin_lock_init(&net->ipv6.addrconf_hash_lock); 7219 INIT_DEFERRABLE_WORK(&net->ipv6.addr_chk_work, addrconf_verify_work); 7220 net->ipv6.inet6_addr_lst = kcalloc(IN6_ADDR_HSIZE, 7221 sizeof(struct hlist_head), 7222 GFP_KERNEL); 7223 if (!net->ipv6.inet6_addr_lst) 7224 goto err_alloc_addr; 7225 7226 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 7227 if (!all) 7228 goto err_alloc_all; 7229 7230 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 7231 if (!dflt) 7232 goto err_alloc_dflt; 7233 7234 if (!net_eq(net, &init_net)) { 7235 switch (net_inherit_devconf()) { 7236 case 1: /* copy from init_net */ 7237 memcpy(all, init_net.ipv6.devconf_all, 7238 sizeof(ipv6_devconf)); 7239 memcpy(dflt, init_net.ipv6.devconf_dflt, 7240 sizeof(ipv6_devconf_dflt)); 7241 break; 7242 case 3: /* copy from the current netns */ 7243 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all, 7244 sizeof(ipv6_devconf)); 7245 memcpy(dflt, 7246 current->nsproxy->net_ns->ipv6.devconf_dflt, 7247 sizeof(ipv6_devconf_dflt)); 7248 break; 7249 case 0: 7250 case 2: 7251 /* use compiled values */ 7252 break; 7253 } 7254 } 7255 7256 /* these will be inherited by all namespaces */ 7257 dflt->autoconf = ipv6_defaults.autoconf; 7258 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 7259 7260 dflt->stable_secret.initialized = false; 7261 all->stable_secret.initialized = false; 7262 7263 net->ipv6.devconf_all = all; 7264 net->ipv6.devconf_dflt = dflt; 7265 7266 #ifdef CONFIG_SYSCTL 7267 err = __addrconf_sysctl_register(net, "all", NULL, all); 7268 if (err < 0) 7269 goto err_reg_all; 7270 7271 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 7272 if (err < 0) 7273 goto err_reg_dflt; 7274 #endif 7275 return 0; 7276 7277 #ifdef CONFIG_SYSCTL 7278 err_reg_dflt: 7279 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 7280 err_reg_all: 7281 kfree(dflt); 7282 net->ipv6.devconf_dflt = NULL; 7283 #endif 7284 err_alloc_dflt: 7285 kfree(all); 7286 net->ipv6.devconf_all = NULL; 7287 err_alloc_all: 7288 kfree(net->ipv6.inet6_addr_lst); 7289 err_alloc_addr: 7290 return err; 7291 } 7292 7293 static void __net_exit addrconf_exit_net(struct net *net) 7294 { 7295 int i; 7296 7297 #ifdef CONFIG_SYSCTL 7298 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 7299 NETCONFA_IFINDEX_DEFAULT); 7300 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 7301 NETCONFA_IFINDEX_ALL); 7302 #endif 7303 kfree(net->ipv6.devconf_dflt); 7304 net->ipv6.devconf_dflt = NULL; 7305 kfree(net->ipv6.devconf_all); 7306 net->ipv6.devconf_all = NULL; 7307 7308 cancel_delayed_work_sync(&net->ipv6.addr_chk_work); 7309 /* 7310 * Check hash table, then free it. 7311 */ 7312 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7313 WARN_ON_ONCE(!hlist_empty(&net->ipv6.inet6_addr_lst[i])); 7314 7315 kfree(net->ipv6.inet6_addr_lst); 7316 net->ipv6.inet6_addr_lst = NULL; 7317 } 7318 7319 static struct pernet_operations addrconf_ops = { 7320 .init = addrconf_init_net, 7321 .exit = addrconf_exit_net, 7322 }; 7323 7324 static struct rtnl_af_ops inet6_ops __read_mostly = { 7325 .family = AF_INET6, 7326 .fill_link_af = inet6_fill_link_af, 7327 .get_link_af_size = inet6_get_link_af_size, 7328 .validate_link_af = inet6_validate_link_af, 7329 .set_link_af = inet6_set_link_af, 7330 }; 7331 7332 /* 7333 * Init / cleanup code 7334 */ 7335 7336 int __init addrconf_init(void) 7337 { 7338 struct inet6_dev *idev; 7339 int err; 7340 7341 err = ipv6_addr_label_init(); 7342 if (err < 0) { 7343 pr_crit("%s: cannot initialize default policy table: %d\n", 7344 __func__, err); 7345 goto out; 7346 } 7347 7348 err = register_pernet_subsys(&addrconf_ops); 7349 if (err < 0) 7350 goto out_addrlabel; 7351 7352 addrconf_wq = create_workqueue("ipv6_addrconf"); 7353 if (!addrconf_wq) { 7354 err = -ENOMEM; 7355 goto out_nowq; 7356 } 7357 7358 rtnl_lock(); 7359 idev = ipv6_add_dev(blackhole_netdev); 7360 rtnl_unlock(); 7361 if (IS_ERR(idev)) { 7362 err = PTR_ERR(idev); 7363 goto errlo; 7364 } 7365 7366 ip6_route_init_special_entries(); 7367 7368 register_netdevice_notifier(&ipv6_dev_notf); 7369 7370 addrconf_verify(&init_net); 7371 7372 rtnl_af_register(&inet6_ops); 7373 7374 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK, 7375 NULL, inet6_dump_ifinfo, 0); 7376 if (err < 0) 7377 goto errout; 7378 7379 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR, 7380 inet6_rtm_newaddr, NULL, 0); 7381 if (err < 0) 7382 goto errout; 7383 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR, 7384 inet6_rtm_deladdr, NULL, 0); 7385 if (err < 0) 7386 goto errout; 7387 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR, 7388 inet6_rtm_getaddr, inet6_dump_ifaddr, 7389 RTNL_FLAG_DOIT_UNLOCKED); 7390 if (err < 0) 7391 goto errout; 7392 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST, 7393 NULL, inet6_dump_ifmcaddr, 0); 7394 if (err < 0) 7395 goto errout; 7396 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST, 7397 NULL, inet6_dump_ifacaddr, 0); 7398 if (err < 0) 7399 goto errout; 7400 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF, 7401 inet6_netconf_get_devconf, 7402 inet6_netconf_dump_devconf, 7403 RTNL_FLAG_DOIT_UNLOCKED); 7404 if (err < 0) 7405 goto errout; 7406 err = ipv6_addr_label_rtnl_register(); 7407 if (err < 0) 7408 goto errout; 7409 7410 return 0; 7411 errout: 7412 rtnl_unregister_all(PF_INET6); 7413 rtnl_af_unregister(&inet6_ops); 7414 unregister_netdevice_notifier(&ipv6_dev_notf); 7415 errlo: 7416 destroy_workqueue(addrconf_wq); 7417 out_nowq: 7418 unregister_pernet_subsys(&addrconf_ops); 7419 out_addrlabel: 7420 ipv6_addr_label_cleanup(); 7421 out: 7422 return err; 7423 } 7424 7425 void addrconf_cleanup(void) 7426 { 7427 struct net_device *dev; 7428 7429 unregister_netdevice_notifier(&ipv6_dev_notf); 7430 unregister_pernet_subsys(&addrconf_ops); 7431 ipv6_addr_label_cleanup(); 7432 7433 rtnl_af_unregister(&inet6_ops); 7434 7435 rtnl_lock(); 7436 7437 /* clean dev list */ 7438 for_each_netdev(&init_net, dev) { 7439 if (__in6_dev_get(dev) == NULL) 7440 continue; 7441 addrconf_ifdown(dev, true); 7442 } 7443 addrconf_ifdown(init_net.loopback_dev, true); 7444 7445 rtnl_unlock(); 7446 7447 destroy_workqueue(addrconf_wq); 7448 } 7449