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 93 #define INFINITY_LIFE_TIME 0xFFFFFFFF 94 95 #define IPV6_MAX_STRLEN \ 96 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") 97 98 static inline u32 cstamp_delta(unsigned long cstamp) 99 { 100 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 101 } 102 103 static inline s32 rfc3315_s14_backoff_init(s32 irt) 104 { 105 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */ 106 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt; 107 do_div(tmp, 1000000); 108 return (s32)tmp; 109 } 110 111 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt) 112 { 113 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */ 114 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt; 115 do_div(tmp, 1000000); 116 if ((s32)tmp > mrt) { 117 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */ 118 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt; 119 do_div(tmp, 1000000); 120 } 121 return (s32)tmp; 122 } 123 124 #ifdef CONFIG_SYSCTL 125 static int addrconf_sysctl_register(struct inet6_dev *idev); 126 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 127 #else 128 static inline int addrconf_sysctl_register(struct inet6_dev *idev) 129 { 130 return 0; 131 } 132 133 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 134 { 135 } 136 #endif 137 138 static void ipv6_gen_rnd_iid(struct in6_addr *addr); 139 140 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 141 static int ipv6_count_addresses(const struct inet6_dev *idev); 142 static int ipv6_generate_stable_address(struct in6_addr *addr, 143 u8 dad_count, 144 const struct inet6_dev *idev); 145 146 #define IN6_ADDR_HSIZE_SHIFT 8 147 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT) 148 /* 149 * Configured unicast address hash table 150 */ 151 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 152 static DEFINE_SPINLOCK(addrconf_hash_lock); 153 154 static void addrconf_verify(void); 155 static void addrconf_verify_rtnl(void); 156 static void addrconf_verify_work(struct work_struct *); 157 158 static struct workqueue_struct *addrconf_wq; 159 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work); 160 161 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 162 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 163 164 static void addrconf_type_change(struct net_device *dev, 165 unsigned long event); 166 static int addrconf_ifdown(struct net_device *dev, bool unregister); 167 168 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 169 int plen, 170 const struct net_device *dev, 171 u32 flags, u32 noflags, 172 bool no_gw); 173 174 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 175 static void addrconf_dad_work(struct work_struct *w); 176 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 177 bool send_na); 178 static void addrconf_dad_run(struct inet6_dev *idev, bool restart); 179 static void addrconf_rs_timer(struct timer_list *t); 180 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 181 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 182 183 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 184 struct prefix_info *pinfo); 185 186 static struct ipv6_devconf ipv6_devconf __read_mostly = { 187 .forwarding = 0, 188 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 189 .mtu6 = IPV6_MIN_MTU, 190 .accept_ra = 1, 191 .accept_redirects = 1, 192 .autoconf = 1, 193 .force_mld_version = 0, 194 .mldv1_unsolicited_report_interval = 10 * HZ, 195 .mldv2_unsolicited_report_interval = HZ, 196 .dad_transmits = 1, 197 .rtr_solicits = MAX_RTR_SOLICITATIONS, 198 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 199 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 200 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 201 .use_tempaddr = 0, 202 .temp_valid_lft = TEMP_VALID_LIFETIME, 203 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 204 .regen_max_retry = REGEN_MAX_RETRY, 205 .max_desync_factor = MAX_DESYNC_FACTOR, 206 .max_addresses = IPV6_MAX_ADDRESSES, 207 .accept_ra_defrtr = 1, 208 .accept_ra_from_local = 0, 209 .accept_ra_min_hop_limit= 1, 210 .accept_ra_pinfo = 1, 211 #ifdef CONFIG_IPV6_ROUTER_PREF 212 .accept_ra_rtr_pref = 1, 213 .rtr_probe_interval = 60 * HZ, 214 #ifdef CONFIG_IPV6_ROUTE_INFO 215 .accept_ra_rt_info_min_plen = 0, 216 .accept_ra_rt_info_max_plen = 0, 217 #endif 218 #endif 219 .proxy_ndp = 0, 220 .accept_source_route = 0, /* we do not accept RH0 by default. */ 221 .disable_ipv6 = 0, 222 .accept_dad = 0, 223 .suppress_frag_ndisc = 1, 224 .accept_ra_mtu = 1, 225 .stable_secret = { 226 .initialized = false, 227 }, 228 .use_oif_addrs_only = 0, 229 .ignore_routes_with_linkdown = 0, 230 .keep_addr_on_down = 0, 231 .seg6_enabled = 0, 232 #ifdef CONFIG_IPV6_SEG6_HMAC 233 .seg6_require_hmac = 0, 234 #endif 235 .enhanced_dad = 1, 236 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 237 .disable_policy = 0, 238 .rpl_seg_enabled = 0, 239 }; 240 241 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 242 .forwarding = 0, 243 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 244 .mtu6 = IPV6_MIN_MTU, 245 .accept_ra = 1, 246 .accept_redirects = 1, 247 .autoconf = 1, 248 .force_mld_version = 0, 249 .mldv1_unsolicited_report_interval = 10 * HZ, 250 .mldv2_unsolicited_report_interval = HZ, 251 .dad_transmits = 1, 252 .rtr_solicits = MAX_RTR_SOLICITATIONS, 253 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 254 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 255 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 256 .use_tempaddr = 0, 257 .temp_valid_lft = TEMP_VALID_LIFETIME, 258 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 259 .regen_max_retry = REGEN_MAX_RETRY, 260 .max_desync_factor = MAX_DESYNC_FACTOR, 261 .max_addresses = IPV6_MAX_ADDRESSES, 262 .accept_ra_defrtr = 1, 263 .accept_ra_from_local = 0, 264 .accept_ra_min_hop_limit= 1, 265 .accept_ra_pinfo = 1, 266 #ifdef CONFIG_IPV6_ROUTER_PREF 267 .accept_ra_rtr_pref = 1, 268 .rtr_probe_interval = 60 * HZ, 269 #ifdef CONFIG_IPV6_ROUTE_INFO 270 .accept_ra_rt_info_min_plen = 0, 271 .accept_ra_rt_info_max_plen = 0, 272 #endif 273 #endif 274 .proxy_ndp = 0, 275 .accept_source_route = 0, /* we do not accept RH0 by default. */ 276 .disable_ipv6 = 0, 277 .accept_dad = 1, 278 .suppress_frag_ndisc = 1, 279 .accept_ra_mtu = 1, 280 .stable_secret = { 281 .initialized = false, 282 }, 283 .use_oif_addrs_only = 0, 284 .ignore_routes_with_linkdown = 0, 285 .keep_addr_on_down = 0, 286 .seg6_enabled = 0, 287 #ifdef CONFIG_IPV6_SEG6_HMAC 288 .seg6_require_hmac = 0, 289 #endif 290 .enhanced_dad = 1, 291 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 292 .disable_policy = 0, 293 .rpl_seg_enabled = 0, 294 }; 295 296 /* Check if link is ready: is it up and is a valid qdisc available */ 297 static inline bool addrconf_link_ready(const struct net_device *dev) 298 { 299 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev); 300 } 301 302 static void addrconf_del_rs_timer(struct inet6_dev *idev) 303 { 304 if (del_timer(&idev->rs_timer)) 305 __in6_dev_put(idev); 306 } 307 308 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 309 { 310 if (cancel_delayed_work(&ifp->dad_work)) 311 __in6_ifa_put(ifp); 312 } 313 314 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 315 unsigned long when) 316 { 317 if (!timer_pending(&idev->rs_timer)) 318 in6_dev_hold(idev); 319 mod_timer(&idev->rs_timer, jiffies + when); 320 } 321 322 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 323 unsigned long delay) 324 { 325 in6_ifa_hold(ifp); 326 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay)) 327 in6_ifa_put(ifp); 328 } 329 330 static int snmp6_alloc_dev(struct inet6_dev *idev) 331 { 332 int i; 333 334 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib); 335 if (!idev->stats.ipv6) 336 goto err_ip; 337 338 for_each_possible_cpu(i) { 339 struct ipstats_mib *addrconf_stats; 340 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 341 u64_stats_init(&addrconf_stats->syncp); 342 } 343 344 345 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 346 GFP_KERNEL); 347 if (!idev->stats.icmpv6dev) 348 goto err_icmp; 349 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 350 GFP_KERNEL); 351 if (!idev->stats.icmpv6msgdev) 352 goto err_icmpmsg; 353 354 return 0; 355 356 err_icmpmsg: 357 kfree(idev->stats.icmpv6dev); 358 err_icmp: 359 free_percpu(idev->stats.ipv6); 360 err_ip: 361 return -ENOMEM; 362 } 363 364 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 365 { 366 struct inet6_dev *ndev; 367 int err = -ENOMEM; 368 369 ASSERT_RTNL(); 370 371 if (dev->mtu < IPV6_MIN_MTU) 372 return ERR_PTR(-EINVAL); 373 374 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 375 if (!ndev) 376 return ERR_PTR(err); 377 378 rwlock_init(&ndev->lock); 379 ndev->dev = dev; 380 INIT_LIST_HEAD(&ndev->addr_list); 381 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0); 382 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 383 384 if (ndev->cnf.stable_secret.initialized) 385 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 386 387 ndev->cnf.mtu6 = dev->mtu; 388 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 389 if (!ndev->nd_parms) { 390 kfree(ndev); 391 return ERR_PTR(err); 392 } 393 if (ndev->cnf.forwarding) 394 dev_disable_lro(dev); 395 /* We refer to the device */ 396 dev_hold(dev); 397 398 if (snmp6_alloc_dev(ndev) < 0) { 399 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n", 400 __func__); 401 neigh_parms_release(&nd_tbl, ndev->nd_parms); 402 dev_put(dev); 403 kfree(ndev); 404 return ERR_PTR(err); 405 } 406 407 if (snmp6_register_dev(ndev) < 0) { 408 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n", 409 __func__, dev->name); 410 goto err_release; 411 } 412 413 /* One reference from device. */ 414 refcount_set(&ndev->refcnt, 1); 415 416 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 417 ndev->cnf.accept_dad = -1; 418 419 #if IS_ENABLED(CONFIG_IPV6_SIT) 420 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 421 pr_info("%s: Disabled Multicast RS\n", dev->name); 422 ndev->cnf.rtr_solicits = 0; 423 } 424 #endif 425 426 INIT_LIST_HEAD(&ndev->tempaddr_list); 427 ndev->desync_factor = U32_MAX; 428 if ((dev->flags&IFF_LOOPBACK) || 429 dev->type == ARPHRD_TUNNEL || 430 dev->type == ARPHRD_TUNNEL6 || 431 dev->type == ARPHRD_SIT || 432 dev->type == ARPHRD_NONE) { 433 ndev->cnf.use_tempaddr = -1; 434 } 435 436 ndev->token = in6addr_any; 437 438 if (netif_running(dev) && addrconf_link_ready(dev)) 439 ndev->if_flags |= IF_READY; 440 441 ipv6_mc_init_dev(ndev); 442 ndev->tstamp = jiffies; 443 err = addrconf_sysctl_register(ndev); 444 if (err) { 445 ipv6_mc_destroy_dev(ndev); 446 snmp6_unregister_dev(ndev); 447 goto err_release; 448 } 449 /* protected by rtnl_lock */ 450 rcu_assign_pointer(dev->ip6_ptr, ndev); 451 452 /* Join interface-local all-node multicast group */ 453 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 454 455 /* Join all-node multicast group */ 456 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 457 458 /* Join all-router multicast group if forwarding is set */ 459 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 460 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 461 462 return ndev; 463 464 err_release: 465 neigh_parms_release(&nd_tbl, ndev->nd_parms); 466 ndev->dead = 1; 467 in6_dev_finish_destroy(ndev); 468 return ERR_PTR(err); 469 } 470 471 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 472 { 473 struct inet6_dev *idev; 474 475 ASSERT_RTNL(); 476 477 idev = __in6_dev_get(dev); 478 if (!idev) { 479 idev = ipv6_add_dev(dev); 480 if (IS_ERR(idev)) 481 return idev; 482 } 483 484 if (dev->flags&IFF_UP) 485 ipv6_mc_up(idev); 486 return idev; 487 } 488 489 static int inet6_netconf_msgsize_devconf(int type) 490 { 491 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 492 + nla_total_size(4); /* NETCONFA_IFINDEX */ 493 bool all = false; 494 495 if (type == NETCONFA_ALL) 496 all = true; 497 498 if (all || type == NETCONFA_FORWARDING) 499 size += nla_total_size(4); 500 #ifdef CONFIG_IPV6_MROUTE 501 if (all || type == NETCONFA_MC_FORWARDING) 502 size += nla_total_size(4); 503 #endif 504 if (all || type == NETCONFA_PROXY_NEIGH) 505 size += nla_total_size(4); 506 507 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 508 size += nla_total_size(4); 509 510 return size; 511 } 512 513 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 514 struct ipv6_devconf *devconf, u32 portid, 515 u32 seq, int event, unsigned int flags, 516 int type) 517 { 518 struct nlmsghdr *nlh; 519 struct netconfmsg *ncm; 520 bool all = false; 521 522 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 523 flags); 524 if (!nlh) 525 return -EMSGSIZE; 526 527 if (type == NETCONFA_ALL) 528 all = true; 529 530 ncm = nlmsg_data(nlh); 531 ncm->ncm_family = AF_INET6; 532 533 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 534 goto nla_put_failure; 535 536 if (!devconf) 537 goto out; 538 539 if ((all || type == NETCONFA_FORWARDING) && 540 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 541 goto nla_put_failure; 542 #ifdef CONFIG_IPV6_MROUTE 543 if ((all || type == NETCONFA_MC_FORWARDING) && 544 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 545 devconf->mc_forwarding) < 0) 546 goto nla_put_failure; 547 #endif 548 if ((all || type == NETCONFA_PROXY_NEIGH) && 549 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 550 goto nla_put_failure; 551 552 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 553 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 554 devconf->ignore_routes_with_linkdown) < 0) 555 goto nla_put_failure; 556 557 out: 558 nlmsg_end(skb, nlh); 559 return 0; 560 561 nla_put_failure: 562 nlmsg_cancel(skb, nlh); 563 return -EMSGSIZE; 564 } 565 566 void inet6_netconf_notify_devconf(struct net *net, int event, int type, 567 int ifindex, struct ipv6_devconf *devconf) 568 { 569 struct sk_buff *skb; 570 int err = -ENOBUFS; 571 572 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL); 573 if (!skb) 574 goto errout; 575 576 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 577 event, 0, type); 578 if (err < 0) { 579 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 580 WARN_ON(err == -EMSGSIZE); 581 kfree_skb(skb); 582 goto errout; 583 } 584 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL); 585 return; 586 errout: 587 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 588 } 589 590 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 591 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 592 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 593 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 594 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 595 }; 596 597 static int inet6_netconf_valid_get_req(struct sk_buff *skb, 598 const struct nlmsghdr *nlh, 599 struct nlattr **tb, 600 struct netlink_ext_ack *extack) 601 { 602 int i, err; 603 604 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) { 605 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request"); 606 return -EINVAL; 607 } 608 609 if (!netlink_strict_get_check(skb)) 610 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg), 611 tb, NETCONFA_MAX, 612 devconf_ipv6_policy, extack); 613 614 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg), 615 tb, NETCONFA_MAX, 616 devconf_ipv6_policy, extack); 617 if (err) 618 return err; 619 620 for (i = 0; i <= NETCONFA_MAX; i++) { 621 if (!tb[i]) 622 continue; 623 624 switch (i) { 625 case NETCONFA_IFINDEX: 626 break; 627 default: 628 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request"); 629 return -EINVAL; 630 } 631 } 632 633 return 0; 634 } 635 636 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 637 struct nlmsghdr *nlh, 638 struct netlink_ext_ack *extack) 639 { 640 struct net *net = sock_net(in_skb->sk); 641 struct nlattr *tb[NETCONFA_MAX+1]; 642 struct inet6_dev *in6_dev = NULL; 643 struct net_device *dev = NULL; 644 struct sk_buff *skb; 645 struct ipv6_devconf *devconf; 646 int ifindex; 647 int err; 648 649 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack); 650 if (err < 0) 651 return err; 652 653 if (!tb[NETCONFA_IFINDEX]) 654 return -EINVAL; 655 656 err = -EINVAL; 657 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 658 switch (ifindex) { 659 case NETCONFA_IFINDEX_ALL: 660 devconf = net->ipv6.devconf_all; 661 break; 662 case NETCONFA_IFINDEX_DEFAULT: 663 devconf = net->ipv6.devconf_dflt; 664 break; 665 default: 666 dev = dev_get_by_index(net, ifindex); 667 if (!dev) 668 return -EINVAL; 669 in6_dev = in6_dev_get(dev); 670 if (!in6_dev) 671 goto errout; 672 devconf = &in6_dev->cnf; 673 break; 674 } 675 676 err = -ENOBUFS; 677 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); 678 if (!skb) 679 goto errout; 680 681 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 682 NETLINK_CB(in_skb).portid, 683 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 684 NETCONFA_ALL); 685 if (err < 0) { 686 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 687 WARN_ON(err == -EMSGSIZE); 688 kfree_skb(skb); 689 goto errout; 690 } 691 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 692 errout: 693 if (in6_dev) 694 in6_dev_put(in6_dev); 695 if (dev) 696 dev_put(dev); 697 return err; 698 } 699 700 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 701 struct netlink_callback *cb) 702 { 703 const struct nlmsghdr *nlh = cb->nlh; 704 struct net *net = sock_net(skb->sk); 705 int h, s_h; 706 int idx, s_idx; 707 struct net_device *dev; 708 struct inet6_dev *idev; 709 struct hlist_head *head; 710 711 if (cb->strict_check) { 712 struct netlink_ext_ack *extack = cb->extack; 713 struct netconfmsg *ncm; 714 715 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) { 716 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request"); 717 return -EINVAL; 718 } 719 720 if (nlmsg_attrlen(nlh, sizeof(*ncm))) { 721 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request"); 722 return -EINVAL; 723 } 724 } 725 726 s_h = cb->args[0]; 727 s_idx = idx = cb->args[1]; 728 729 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 730 idx = 0; 731 head = &net->dev_index_head[h]; 732 rcu_read_lock(); 733 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 734 net->dev_base_seq; 735 hlist_for_each_entry_rcu(dev, head, index_hlist) { 736 if (idx < s_idx) 737 goto cont; 738 idev = __in6_dev_get(dev); 739 if (!idev) 740 goto cont; 741 742 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 743 &idev->cnf, 744 NETLINK_CB(cb->skb).portid, 745 nlh->nlmsg_seq, 746 RTM_NEWNETCONF, 747 NLM_F_MULTI, 748 NETCONFA_ALL) < 0) { 749 rcu_read_unlock(); 750 goto done; 751 } 752 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 753 cont: 754 idx++; 755 } 756 rcu_read_unlock(); 757 } 758 if (h == NETDEV_HASHENTRIES) { 759 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 760 net->ipv6.devconf_all, 761 NETLINK_CB(cb->skb).portid, 762 nlh->nlmsg_seq, 763 RTM_NEWNETCONF, NLM_F_MULTI, 764 NETCONFA_ALL) < 0) 765 goto done; 766 else 767 h++; 768 } 769 if (h == NETDEV_HASHENTRIES + 1) { 770 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 771 net->ipv6.devconf_dflt, 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 done: 781 cb->args[0] = h; 782 cb->args[1] = idx; 783 784 return skb->len; 785 } 786 787 #ifdef CONFIG_SYSCTL 788 static void dev_forward_change(struct inet6_dev *idev) 789 { 790 struct net_device *dev; 791 struct inet6_ifaddr *ifa; 792 793 if (!idev) 794 return; 795 dev = idev->dev; 796 if (idev->cnf.forwarding) 797 dev_disable_lro(dev); 798 if (dev->flags & IFF_MULTICAST) { 799 if (idev->cnf.forwarding) { 800 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 801 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 802 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 803 } else { 804 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 805 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 806 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 807 } 808 } 809 810 list_for_each_entry(ifa, &idev->addr_list, if_list) { 811 if (ifa->flags&IFA_F_TENTATIVE) 812 continue; 813 if (idev->cnf.forwarding) 814 addrconf_join_anycast(ifa); 815 else 816 addrconf_leave_anycast(ifa); 817 } 818 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, 819 NETCONFA_FORWARDING, 820 dev->ifindex, &idev->cnf); 821 } 822 823 824 static void addrconf_forward_change(struct net *net, __s32 newf) 825 { 826 struct net_device *dev; 827 struct inet6_dev *idev; 828 829 for_each_netdev(net, dev) { 830 idev = __in6_dev_get(dev); 831 if (idev) { 832 int changed = (!idev->cnf.forwarding) ^ (!newf); 833 idev->cnf.forwarding = newf; 834 if (changed) 835 dev_forward_change(idev); 836 } 837 } 838 } 839 840 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 841 { 842 struct net *net; 843 int old; 844 845 if (!rtnl_trylock()) 846 return restart_syscall(); 847 848 net = (struct net *)table->extra2; 849 old = *p; 850 *p = newf; 851 852 if (p == &net->ipv6.devconf_dflt->forwarding) { 853 if ((!newf) ^ (!old)) 854 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 855 NETCONFA_FORWARDING, 856 NETCONFA_IFINDEX_DEFAULT, 857 net->ipv6.devconf_dflt); 858 rtnl_unlock(); 859 return 0; 860 } 861 862 if (p == &net->ipv6.devconf_all->forwarding) { 863 int old_dflt = net->ipv6.devconf_dflt->forwarding; 864 865 net->ipv6.devconf_dflt->forwarding = newf; 866 if ((!newf) ^ (!old_dflt)) 867 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 868 NETCONFA_FORWARDING, 869 NETCONFA_IFINDEX_DEFAULT, 870 net->ipv6.devconf_dflt); 871 872 addrconf_forward_change(net, newf); 873 if ((!newf) ^ (!old)) 874 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 875 NETCONFA_FORWARDING, 876 NETCONFA_IFINDEX_ALL, 877 net->ipv6.devconf_all); 878 } else if ((!newf) ^ (!old)) 879 dev_forward_change((struct inet6_dev *)table->extra1); 880 rtnl_unlock(); 881 882 if (newf) 883 rt6_purge_dflt_routers(net); 884 return 1; 885 } 886 887 static void addrconf_linkdown_change(struct net *net, __s32 newf) 888 { 889 struct net_device *dev; 890 struct inet6_dev *idev; 891 892 for_each_netdev(net, dev) { 893 idev = __in6_dev_get(dev); 894 if (idev) { 895 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 896 897 idev->cnf.ignore_routes_with_linkdown = newf; 898 if (changed) 899 inet6_netconf_notify_devconf(dev_net(dev), 900 RTM_NEWNETCONF, 901 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 902 dev->ifindex, 903 &idev->cnf); 904 } 905 } 906 } 907 908 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 909 { 910 struct net *net; 911 int old; 912 913 if (!rtnl_trylock()) 914 return restart_syscall(); 915 916 net = (struct net *)table->extra2; 917 old = *p; 918 *p = newf; 919 920 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 921 if ((!newf) ^ (!old)) 922 inet6_netconf_notify_devconf(net, 923 RTM_NEWNETCONF, 924 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 925 NETCONFA_IFINDEX_DEFAULT, 926 net->ipv6.devconf_dflt); 927 rtnl_unlock(); 928 return 0; 929 } 930 931 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 932 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 933 addrconf_linkdown_change(net, newf); 934 if ((!newf) ^ (!old)) 935 inet6_netconf_notify_devconf(net, 936 RTM_NEWNETCONF, 937 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 938 NETCONFA_IFINDEX_ALL, 939 net->ipv6.devconf_all); 940 } 941 rtnl_unlock(); 942 943 return 1; 944 } 945 946 #endif 947 948 /* Nobody refers to this ifaddr, destroy it */ 949 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 950 { 951 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 952 953 #ifdef NET_REFCNT_DEBUG 954 pr_debug("%s\n", __func__); 955 #endif 956 957 in6_dev_put(ifp->idev); 958 959 if (cancel_delayed_work(&ifp->dad_work)) 960 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 961 ifp); 962 963 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 964 pr_warn("Freeing alive inet6 address %p\n", ifp); 965 return; 966 } 967 968 kfree_rcu(ifp, rcu); 969 } 970 971 static void 972 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 973 { 974 struct list_head *p; 975 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 976 977 /* 978 * Each device address list is sorted in order of scope - 979 * global before linklocal. 980 */ 981 list_for_each(p, &idev->addr_list) { 982 struct inet6_ifaddr *ifa 983 = list_entry(p, struct inet6_ifaddr, if_list); 984 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 985 break; 986 } 987 988 list_add_tail_rcu(&ifp->if_list, p); 989 } 990 991 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr) 992 { 993 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net); 994 995 return hash_32(val, IN6_ADDR_HSIZE_SHIFT); 996 } 997 998 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 999 struct net_device *dev, unsigned int hash) 1000 { 1001 struct inet6_ifaddr *ifp; 1002 1003 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1004 if (!net_eq(dev_net(ifp->idev->dev), net)) 1005 continue; 1006 if (ipv6_addr_equal(&ifp->addr, addr)) { 1007 if (!dev || ifp->idev->dev == dev) 1008 return true; 1009 } 1010 } 1011 return false; 1012 } 1013 1014 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa) 1015 { 1016 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr); 1017 int err = 0; 1018 1019 spin_lock(&addrconf_hash_lock); 1020 1021 /* Ignore adding duplicate addresses on an interface */ 1022 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) { 1023 netdev_dbg(dev, "ipv6_add_addr: already assigned\n"); 1024 err = -EEXIST; 1025 } else { 1026 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 1027 } 1028 1029 spin_unlock(&addrconf_hash_lock); 1030 1031 return err; 1032 } 1033 1034 /* On success it returns ifp with increased reference count */ 1035 1036 static struct inet6_ifaddr * 1037 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg, 1038 bool can_block, struct netlink_ext_ack *extack) 1039 { 1040 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC; 1041 int addr_type = ipv6_addr_type(cfg->pfx); 1042 struct net *net = dev_net(idev->dev); 1043 struct inet6_ifaddr *ifa = NULL; 1044 struct fib6_info *f6i = NULL; 1045 int err = 0; 1046 1047 if (addr_type == IPV6_ADDR_ANY || 1048 (addr_type & IPV6_ADDR_MULTICAST && 1049 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) || 1050 (!(idev->dev->flags & IFF_LOOPBACK) && 1051 !netif_is_l3_master(idev->dev) && 1052 addr_type & IPV6_ADDR_LOOPBACK)) 1053 return ERR_PTR(-EADDRNOTAVAIL); 1054 1055 if (idev->dead) { 1056 err = -ENODEV; /*XXX*/ 1057 goto out; 1058 } 1059 1060 if (idev->cnf.disable_ipv6) { 1061 err = -EACCES; 1062 goto out; 1063 } 1064 1065 /* validator notifier needs to be blocking; 1066 * do not call in atomic context 1067 */ 1068 if (can_block) { 1069 struct in6_validator_info i6vi = { 1070 .i6vi_addr = *cfg->pfx, 1071 .i6vi_dev = idev, 1072 .extack = extack, 1073 }; 1074 1075 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi); 1076 err = notifier_to_errno(err); 1077 if (err < 0) 1078 goto out; 1079 } 1080 1081 ifa = kzalloc(sizeof(*ifa), gfp_flags); 1082 if (!ifa) { 1083 err = -ENOBUFS; 1084 goto out; 1085 } 1086 1087 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags); 1088 if (IS_ERR(f6i)) { 1089 err = PTR_ERR(f6i); 1090 f6i = NULL; 1091 goto out; 1092 } 1093 1094 if (net->ipv6.devconf_all->disable_policy || 1095 idev->cnf.disable_policy) 1096 f6i->dst_nopolicy = true; 1097 1098 neigh_parms_data_state_setall(idev->nd_parms); 1099 1100 ifa->addr = *cfg->pfx; 1101 if (cfg->peer_pfx) 1102 ifa->peer_addr = *cfg->peer_pfx; 1103 1104 spin_lock_init(&ifa->lock); 1105 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1106 INIT_HLIST_NODE(&ifa->addr_lst); 1107 ifa->scope = cfg->scope; 1108 ifa->prefix_len = cfg->plen; 1109 ifa->rt_priority = cfg->rt_priority; 1110 ifa->flags = cfg->ifa_flags; 1111 /* No need to add the TENTATIVE flag for addresses with NODAD */ 1112 if (!(cfg->ifa_flags & IFA_F_NODAD)) 1113 ifa->flags |= IFA_F_TENTATIVE; 1114 ifa->valid_lft = cfg->valid_lft; 1115 ifa->prefered_lft = cfg->preferred_lft; 1116 ifa->cstamp = ifa->tstamp = jiffies; 1117 ifa->tokenized = false; 1118 1119 ifa->rt = f6i; 1120 1121 ifa->idev = idev; 1122 in6_dev_hold(idev); 1123 1124 /* For caller */ 1125 refcount_set(&ifa->refcnt, 1); 1126 1127 rcu_read_lock_bh(); 1128 1129 err = ipv6_add_addr_hash(idev->dev, ifa); 1130 if (err < 0) { 1131 rcu_read_unlock_bh(); 1132 goto out; 1133 } 1134 1135 write_lock(&idev->lock); 1136 1137 /* Add to inet6_dev unicast addr list. */ 1138 ipv6_link_dev_addr(idev, ifa); 1139 1140 if (ifa->flags&IFA_F_TEMPORARY) { 1141 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1142 in6_ifa_hold(ifa); 1143 } 1144 1145 in6_ifa_hold(ifa); 1146 write_unlock(&idev->lock); 1147 1148 rcu_read_unlock_bh(); 1149 1150 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1151 out: 1152 if (unlikely(err < 0)) { 1153 fib6_info_release(f6i); 1154 1155 if (ifa) { 1156 if (ifa->idev) 1157 in6_dev_put(ifa->idev); 1158 kfree(ifa); 1159 } 1160 ifa = ERR_PTR(err); 1161 } 1162 1163 return ifa; 1164 } 1165 1166 enum cleanup_prefix_rt_t { 1167 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1168 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1169 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1170 }; 1171 1172 /* 1173 * Check, whether the prefix for ifp would still need a prefix route 1174 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1175 * constants. 1176 * 1177 * 1) we don't purge prefix if address was not permanent. 1178 * prefix is managed by its own lifetime. 1179 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1180 * 3) if there are no addresses, delete prefix. 1181 * 4) if there are still other permanent address(es), 1182 * corresponding prefix is still permanent. 1183 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1184 * don't purge the prefix, assume user space is managing it. 1185 * 6) otherwise, update prefix lifetime to the 1186 * longest valid lifetime among the corresponding 1187 * addresses on the device. 1188 * Note: subsequent RA will update lifetime. 1189 **/ 1190 static enum cleanup_prefix_rt_t 1191 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1192 { 1193 struct inet6_ifaddr *ifa; 1194 struct inet6_dev *idev = ifp->idev; 1195 unsigned long lifetime; 1196 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1197 1198 *expires = jiffies; 1199 1200 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1201 if (ifa == ifp) 1202 continue; 1203 if (ifa->prefix_len != ifp->prefix_len || 1204 !ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1205 ifp->prefix_len)) 1206 continue; 1207 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1208 return CLEANUP_PREFIX_RT_NOP; 1209 1210 action = CLEANUP_PREFIX_RT_EXPIRE; 1211 1212 spin_lock(&ifa->lock); 1213 1214 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1215 /* 1216 * Note: Because this address is 1217 * not permanent, lifetime < 1218 * LONG_MAX / HZ here. 1219 */ 1220 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1221 *expires = ifa->tstamp + lifetime * HZ; 1222 spin_unlock(&ifa->lock); 1223 } 1224 1225 return action; 1226 } 1227 1228 static void 1229 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, 1230 bool del_rt, bool del_peer) 1231 { 1232 struct fib6_info *f6i; 1233 1234 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr, 1235 ifp->prefix_len, 1236 ifp->idev->dev, 0, RTF_DEFAULT, true); 1237 if (f6i) { 1238 if (del_rt) 1239 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 1240 else { 1241 if (!(f6i->fib6_flags & RTF_EXPIRES)) 1242 fib6_set_expires(f6i, expires); 1243 fib6_info_release(f6i); 1244 } 1245 } 1246 } 1247 1248 1249 /* This function wants to get referenced ifp and releases it before return */ 1250 1251 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1252 { 1253 int state; 1254 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1255 unsigned long expires; 1256 1257 ASSERT_RTNL(); 1258 1259 spin_lock_bh(&ifp->lock); 1260 state = ifp->state; 1261 ifp->state = INET6_IFADDR_STATE_DEAD; 1262 spin_unlock_bh(&ifp->lock); 1263 1264 if (state == INET6_IFADDR_STATE_DEAD) 1265 goto out; 1266 1267 spin_lock_bh(&addrconf_hash_lock); 1268 hlist_del_init_rcu(&ifp->addr_lst); 1269 spin_unlock_bh(&addrconf_hash_lock); 1270 1271 write_lock_bh(&ifp->idev->lock); 1272 1273 if (ifp->flags&IFA_F_TEMPORARY) { 1274 list_del(&ifp->tmp_list); 1275 if (ifp->ifpub) { 1276 in6_ifa_put(ifp->ifpub); 1277 ifp->ifpub = NULL; 1278 } 1279 __in6_ifa_put(ifp); 1280 } 1281 1282 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1283 action = check_cleanup_prefix_route(ifp, &expires); 1284 1285 list_del_rcu(&ifp->if_list); 1286 __in6_ifa_put(ifp); 1287 1288 write_unlock_bh(&ifp->idev->lock); 1289 1290 addrconf_del_dad_work(ifp); 1291 1292 ipv6_ifa_notify(RTM_DELADDR, ifp); 1293 1294 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1295 1296 if (action != CLEANUP_PREFIX_RT_NOP) { 1297 cleanup_prefix_route(ifp, expires, 1298 action == CLEANUP_PREFIX_RT_DEL, false); 1299 } 1300 1301 /* clean up prefsrc entries */ 1302 rt6_remove_prefsrc(ifp); 1303 out: 1304 in6_ifa_put(ifp); 1305 } 1306 1307 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block) 1308 { 1309 struct inet6_dev *idev = ifp->idev; 1310 unsigned long tmp_tstamp, age; 1311 unsigned long regen_advance; 1312 unsigned long now = jiffies; 1313 s32 cnf_temp_preferred_lft; 1314 struct inet6_ifaddr *ift; 1315 struct ifa6_config cfg; 1316 long max_desync_factor; 1317 struct in6_addr addr; 1318 int ret = 0; 1319 1320 write_lock_bh(&idev->lock); 1321 1322 retry: 1323 in6_dev_hold(idev); 1324 if (idev->cnf.use_tempaddr <= 0) { 1325 write_unlock_bh(&idev->lock); 1326 pr_info("%s: use_tempaddr is disabled\n", __func__); 1327 in6_dev_put(idev); 1328 ret = -1; 1329 goto out; 1330 } 1331 spin_lock_bh(&ifp->lock); 1332 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1333 idev->cnf.use_tempaddr = -1; /*XXX*/ 1334 spin_unlock_bh(&ifp->lock); 1335 write_unlock_bh(&idev->lock); 1336 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1337 __func__); 1338 in6_dev_put(idev); 1339 ret = -1; 1340 goto out; 1341 } 1342 in6_ifa_hold(ifp); 1343 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1344 ipv6_gen_rnd_iid(&addr); 1345 1346 age = (now - ifp->tstamp) / HZ; 1347 1348 regen_advance = idev->cnf.regen_max_retry * 1349 idev->cnf.dad_transmits * 1350 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 1351 1352 /* recalculate max_desync_factor each time and update 1353 * idev->desync_factor if it's larger 1354 */ 1355 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1356 max_desync_factor = min_t(__u32, 1357 idev->cnf.max_desync_factor, 1358 cnf_temp_preferred_lft - regen_advance); 1359 1360 if (unlikely(idev->desync_factor > max_desync_factor)) { 1361 if (max_desync_factor > 0) { 1362 get_random_bytes(&idev->desync_factor, 1363 sizeof(idev->desync_factor)); 1364 idev->desync_factor %= max_desync_factor; 1365 } else { 1366 idev->desync_factor = 0; 1367 } 1368 } 1369 1370 memset(&cfg, 0, sizeof(cfg)); 1371 cfg.valid_lft = min_t(__u32, ifp->valid_lft, 1372 idev->cnf.temp_valid_lft + age); 1373 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor; 1374 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft); 1375 1376 cfg.plen = ifp->prefix_len; 1377 tmp_tstamp = ifp->tstamp; 1378 spin_unlock_bh(&ifp->lock); 1379 1380 write_unlock_bh(&idev->lock); 1381 1382 /* A temporary address is created only if this calculated Preferred 1383 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1384 * an implementation must not create a temporary address with a zero 1385 * Preferred Lifetime. 1386 * Use age calculation as in addrconf_verify to avoid unnecessary 1387 * temporary addresses being generated. 1388 */ 1389 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1390 if (cfg.preferred_lft <= regen_advance + age) { 1391 in6_ifa_put(ifp); 1392 in6_dev_put(idev); 1393 ret = -1; 1394 goto out; 1395 } 1396 1397 cfg.ifa_flags = IFA_F_TEMPORARY; 1398 /* set in addrconf_prefix_rcv() */ 1399 if (ifp->flags & IFA_F_OPTIMISTIC) 1400 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 1401 1402 cfg.pfx = &addr; 1403 cfg.scope = ipv6_addr_scope(cfg.pfx); 1404 1405 ift = ipv6_add_addr(idev, &cfg, block, NULL); 1406 if (IS_ERR(ift)) { 1407 in6_ifa_put(ifp); 1408 in6_dev_put(idev); 1409 pr_info("%s: retry temporary address regeneration\n", __func__); 1410 write_lock_bh(&idev->lock); 1411 goto retry; 1412 } 1413 1414 spin_lock_bh(&ift->lock); 1415 ift->ifpub = ifp; 1416 ift->cstamp = now; 1417 ift->tstamp = tmp_tstamp; 1418 spin_unlock_bh(&ift->lock); 1419 1420 addrconf_dad_start(ift); 1421 in6_ifa_put(ift); 1422 in6_dev_put(idev); 1423 out: 1424 return ret; 1425 } 1426 1427 /* 1428 * Choose an appropriate source address (RFC3484) 1429 */ 1430 enum { 1431 IPV6_SADDR_RULE_INIT = 0, 1432 IPV6_SADDR_RULE_LOCAL, 1433 IPV6_SADDR_RULE_SCOPE, 1434 IPV6_SADDR_RULE_PREFERRED, 1435 #ifdef CONFIG_IPV6_MIP6 1436 IPV6_SADDR_RULE_HOA, 1437 #endif 1438 IPV6_SADDR_RULE_OIF, 1439 IPV6_SADDR_RULE_LABEL, 1440 IPV6_SADDR_RULE_PRIVACY, 1441 IPV6_SADDR_RULE_ORCHID, 1442 IPV6_SADDR_RULE_PREFIX, 1443 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1444 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1445 #endif 1446 IPV6_SADDR_RULE_MAX 1447 }; 1448 1449 struct ipv6_saddr_score { 1450 int rule; 1451 int addr_type; 1452 struct inet6_ifaddr *ifa; 1453 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1454 int scopedist; 1455 int matchlen; 1456 }; 1457 1458 struct ipv6_saddr_dst { 1459 const struct in6_addr *addr; 1460 int ifindex; 1461 int scope; 1462 int label; 1463 unsigned int prefs; 1464 }; 1465 1466 static inline int ipv6_saddr_preferred(int type) 1467 { 1468 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1469 return 1; 1470 return 0; 1471 } 1472 1473 static bool ipv6_use_optimistic_addr(struct net *net, 1474 struct inet6_dev *idev) 1475 { 1476 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1477 if (!idev) 1478 return false; 1479 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1480 return false; 1481 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic) 1482 return false; 1483 1484 return true; 1485 #else 1486 return false; 1487 #endif 1488 } 1489 1490 static bool ipv6_allow_optimistic_dad(struct net *net, 1491 struct inet6_dev *idev) 1492 { 1493 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1494 if (!idev) 1495 return false; 1496 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1497 return false; 1498 1499 return true; 1500 #else 1501 return false; 1502 #endif 1503 } 1504 1505 static int ipv6_get_saddr_eval(struct net *net, 1506 struct ipv6_saddr_score *score, 1507 struct ipv6_saddr_dst *dst, 1508 int i) 1509 { 1510 int ret; 1511 1512 if (i <= score->rule) { 1513 switch (i) { 1514 case IPV6_SADDR_RULE_SCOPE: 1515 ret = score->scopedist; 1516 break; 1517 case IPV6_SADDR_RULE_PREFIX: 1518 ret = score->matchlen; 1519 break; 1520 default: 1521 ret = !!test_bit(i, score->scorebits); 1522 } 1523 goto out; 1524 } 1525 1526 switch (i) { 1527 case IPV6_SADDR_RULE_INIT: 1528 /* Rule 0: remember if hiscore is not ready yet */ 1529 ret = !!score->ifa; 1530 break; 1531 case IPV6_SADDR_RULE_LOCAL: 1532 /* Rule 1: Prefer same address */ 1533 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1534 break; 1535 case IPV6_SADDR_RULE_SCOPE: 1536 /* Rule 2: Prefer appropriate scope 1537 * 1538 * ret 1539 * ^ 1540 * -1 | d 15 1541 * ---+--+-+---> scope 1542 * | 1543 * | d is scope of the destination. 1544 * B-d | \ 1545 * | \ <- smaller scope is better if 1546 * B-15 | \ if scope is enough for destination. 1547 * | ret = B - scope (-1 <= scope >= d <= 15). 1548 * d-C-1 | / 1549 * |/ <- greater is better 1550 * -C / if scope is not enough for destination. 1551 * /| ret = scope - C (-1 <= d < scope <= 15). 1552 * 1553 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1554 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1555 * Assume B = 0 and we get C > 29. 1556 */ 1557 ret = __ipv6_addr_src_scope(score->addr_type); 1558 if (ret >= dst->scope) 1559 ret = -ret; 1560 else 1561 ret -= 128; /* 30 is enough */ 1562 score->scopedist = ret; 1563 break; 1564 case IPV6_SADDR_RULE_PREFERRED: 1565 { 1566 /* Rule 3: Avoid deprecated and optimistic addresses */ 1567 u8 avoid = IFA_F_DEPRECATED; 1568 1569 if (!ipv6_use_optimistic_addr(net, score->ifa->idev)) 1570 avoid |= IFA_F_OPTIMISTIC; 1571 ret = ipv6_saddr_preferred(score->addr_type) || 1572 !(score->ifa->flags & avoid); 1573 break; 1574 } 1575 #ifdef CONFIG_IPV6_MIP6 1576 case IPV6_SADDR_RULE_HOA: 1577 { 1578 /* Rule 4: Prefer home address */ 1579 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1580 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1581 break; 1582 } 1583 #endif 1584 case IPV6_SADDR_RULE_OIF: 1585 /* Rule 5: Prefer outgoing interface */ 1586 ret = (!dst->ifindex || 1587 dst->ifindex == score->ifa->idev->dev->ifindex); 1588 break; 1589 case IPV6_SADDR_RULE_LABEL: 1590 /* Rule 6: Prefer matching label */ 1591 ret = ipv6_addr_label(net, 1592 &score->ifa->addr, score->addr_type, 1593 score->ifa->idev->dev->ifindex) == dst->label; 1594 break; 1595 case IPV6_SADDR_RULE_PRIVACY: 1596 { 1597 /* Rule 7: Prefer public address 1598 * Note: prefer temporary address if use_tempaddr >= 2 1599 */ 1600 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1601 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1602 score->ifa->idev->cnf.use_tempaddr >= 2; 1603 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1604 break; 1605 } 1606 case IPV6_SADDR_RULE_ORCHID: 1607 /* Rule 8-: Prefer ORCHID vs ORCHID or 1608 * non-ORCHID vs non-ORCHID 1609 */ 1610 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1611 ipv6_addr_orchid(dst->addr)); 1612 break; 1613 case IPV6_SADDR_RULE_PREFIX: 1614 /* Rule 8: Use longest matching prefix */ 1615 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1616 if (ret > score->ifa->prefix_len) 1617 ret = score->ifa->prefix_len; 1618 score->matchlen = ret; 1619 break; 1620 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1621 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1622 /* Optimistic addresses still have lower precedence than other 1623 * preferred addresses. 1624 */ 1625 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1626 break; 1627 #endif 1628 default: 1629 ret = 0; 1630 } 1631 1632 if (ret) 1633 __set_bit(i, score->scorebits); 1634 score->rule = i; 1635 out: 1636 return ret; 1637 } 1638 1639 static int __ipv6_dev_get_saddr(struct net *net, 1640 struct ipv6_saddr_dst *dst, 1641 struct inet6_dev *idev, 1642 struct ipv6_saddr_score *scores, 1643 int hiscore_idx) 1644 { 1645 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1646 1647 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) { 1648 int i; 1649 1650 /* 1651 * - Tentative Address (RFC2462 section 5.4) 1652 * - A tentative address is not considered 1653 * "assigned to an interface" in the traditional 1654 * sense, unless it is also flagged as optimistic. 1655 * - Candidate Source Address (section 4) 1656 * - In any case, anycast addresses, multicast 1657 * addresses, and the unspecified address MUST 1658 * NOT be included in a candidate set. 1659 */ 1660 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1661 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1662 continue; 1663 1664 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1665 1666 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1667 score->addr_type & IPV6_ADDR_MULTICAST)) { 1668 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1669 idev->dev->name); 1670 continue; 1671 } 1672 1673 score->rule = -1; 1674 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1675 1676 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1677 int minihiscore, miniscore; 1678 1679 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1680 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1681 1682 if (minihiscore > miniscore) { 1683 if (i == IPV6_SADDR_RULE_SCOPE && 1684 score->scopedist > 0) { 1685 /* 1686 * special case: 1687 * each remaining entry 1688 * has too small (not enough) 1689 * scope, because ifa entries 1690 * are sorted by their scope 1691 * values. 1692 */ 1693 goto out; 1694 } 1695 break; 1696 } else if (minihiscore < miniscore) { 1697 swap(hiscore, score); 1698 hiscore_idx = 1 - hiscore_idx; 1699 1700 /* restore our iterator */ 1701 score->ifa = hiscore->ifa; 1702 1703 break; 1704 } 1705 } 1706 } 1707 out: 1708 return hiscore_idx; 1709 } 1710 1711 static int ipv6_get_saddr_master(struct net *net, 1712 const struct net_device *dst_dev, 1713 const struct net_device *master, 1714 struct ipv6_saddr_dst *dst, 1715 struct ipv6_saddr_score *scores, 1716 int hiscore_idx) 1717 { 1718 struct inet6_dev *idev; 1719 1720 idev = __in6_dev_get(dst_dev); 1721 if (idev) 1722 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1723 scores, hiscore_idx); 1724 1725 idev = __in6_dev_get(master); 1726 if (idev) 1727 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1728 scores, hiscore_idx); 1729 1730 return hiscore_idx; 1731 } 1732 1733 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1734 const struct in6_addr *daddr, unsigned int prefs, 1735 struct in6_addr *saddr) 1736 { 1737 struct ipv6_saddr_score scores[2], *hiscore; 1738 struct ipv6_saddr_dst dst; 1739 struct inet6_dev *idev; 1740 struct net_device *dev; 1741 int dst_type; 1742 bool use_oif_addr = false; 1743 int hiscore_idx = 0; 1744 int ret = 0; 1745 1746 dst_type = __ipv6_addr_type(daddr); 1747 dst.addr = daddr; 1748 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1749 dst.scope = __ipv6_addr_src_scope(dst_type); 1750 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1751 dst.prefs = prefs; 1752 1753 scores[hiscore_idx].rule = -1; 1754 scores[hiscore_idx].ifa = NULL; 1755 1756 rcu_read_lock(); 1757 1758 /* Candidate Source Address (section 4) 1759 * - multicast and link-local destination address, 1760 * the set of candidate source address MUST only 1761 * include addresses assigned to interfaces 1762 * belonging to the same link as the outgoing 1763 * interface. 1764 * (- For site-local destination addresses, the 1765 * set of candidate source addresses MUST only 1766 * include addresses assigned to interfaces 1767 * belonging to the same site as the outgoing 1768 * interface.) 1769 * - "It is RECOMMENDED that the candidate source addresses 1770 * be the set of unicast addresses assigned to the 1771 * interface that will be used to send to the destination 1772 * (the 'outgoing' interface)." (RFC 6724) 1773 */ 1774 if (dst_dev) { 1775 idev = __in6_dev_get(dst_dev); 1776 if ((dst_type & IPV6_ADDR_MULTICAST) || 1777 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1778 (idev && idev->cnf.use_oif_addrs_only)) { 1779 use_oif_addr = true; 1780 } 1781 } 1782 1783 if (use_oif_addr) { 1784 if (idev) 1785 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1786 } else { 1787 const struct net_device *master; 1788 int master_idx = 0; 1789 1790 /* if dst_dev exists and is enslaved to an L3 device, then 1791 * prefer addresses from dst_dev and then the master over 1792 * any other enslaved devices in the L3 domain. 1793 */ 1794 master = l3mdev_master_dev_rcu(dst_dev); 1795 if (master) { 1796 master_idx = master->ifindex; 1797 1798 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1799 master, &dst, 1800 scores, hiscore_idx); 1801 1802 if (scores[hiscore_idx].ifa) 1803 goto out; 1804 } 1805 1806 for_each_netdev_rcu(net, dev) { 1807 /* only consider addresses on devices in the 1808 * same L3 domain 1809 */ 1810 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1811 continue; 1812 idev = __in6_dev_get(dev); 1813 if (!idev) 1814 continue; 1815 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1816 } 1817 } 1818 1819 out: 1820 hiscore = &scores[hiscore_idx]; 1821 if (!hiscore->ifa) 1822 ret = -EADDRNOTAVAIL; 1823 else 1824 *saddr = hiscore->ifa->addr; 1825 1826 rcu_read_unlock(); 1827 return ret; 1828 } 1829 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1830 1831 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1832 u32 banned_flags) 1833 { 1834 struct inet6_ifaddr *ifp; 1835 int err = -EADDRNOTAVAIL; 1836 1837 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1838 if (ifp->scope > IFA_LINK) 1839 break; 1840 if (ifp->scope == IFA_LINK && 1841 !(ifp->flags & banned_flags)) { 1842 *addr = ifp->addr; 1843 err = 0; 1844 break; 1845 } 1846 } 1847 return err; 1848 } 1849 1850 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1851 u32 banned_flags) 1852 { 1853 struct inet6_dev *idev; 1854 int err = -EADDRNOTAVAIL; 1855 1856 rcu_read_lock(); 1857 idev = __in6_dev_get(dev); 1858 if (idev) { 1859 read_lock_bh(&idev->lock); 1860 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1861 read_unlock_bh(&idev->lock); 1862 } 1863 rcu_read_unlock(); 1864 return err; 1865 } 1866 1867 static int ipv6_count_addresses(const struct inet6_dev *idev) 1868 { 1869 const struct inet6_ifaddr *ifp; 1870 int cnt = 0; 1871 1872 rcu_read_lock(); 1873 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list) 1874 cnt++; 1875 rcu_read_unlock(); 1876 return cnt; 1877 } 1878 1879 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1880 const struct net_device *dev, int strict) 1881 { 1882 return ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1883 strict, IFA_F_TENTATIVE); 1884 } 1885 EXPORT_SYMBOL(ipv6_chk_addr); 1886 1887 /* device argument is used to find the L3 domain of interest. If 1888 * skip_dev_check is set, then the ifp device is not checked against 1889 * the passed in dev argument. So the 2 cases for addresses checks are: 1890 * 1. does the address exist in the L3 domain that dev is part of 1891 * (skip_dev_check = true), or 1892 * 1893 * 2. does the address exist on the specific device 1894 * (skip_dev_check = false) 1895 */ 1896 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1897 const struct net_device *dev, bool skip_dev_check, 1898 int strict, u32 banned_flags) 1899 { 1900 unsigned int hash = inet6_addr_hash(net, addr); 1901 const struct net_device *l3mdev; 1902 struct inet6_ifaddr *ifp; 1903 u32 ifp_flags; 1904 1905 rcu_read_lock(); 1906 1907 l3mdev = l3mdev_master_dev_rcu(dev); 1908 if (skip_dev_check) 1909 dev = NULL; 1910 1911 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1912 if (!net_eq(dev_net(ifp->idev->dev), net)) 1913 continue; 1914 1915 if (l3mdev_master_dev_rcu(ifp->idev->dev) != l3mdev) 1916 continue; 1917 1918 /* Decouple optimistic from tentative for evaluation here. 1919 * Ban optimistic addresses explicitly, when required. 1920 */ 1921 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1922 ? (ifp->flags&~IFA_F_TENTATIVE) 1923 : ifp->flags; 1924 if (ipv6_addr_equal(&ifp->addr, addr) && 1925 !(ifp_flags&banned_flags) && 1926 (!dev || ifp->idev->dev == dev || 1927 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1928 rcu_read_unlock(); 1929 return 1; 1930 } 1931 } 1932 1933 rcu_read_unlock(); 1934 return 0; 1935 } 1936 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1937 1938 1939 /* Compares an address/prefix_len with addresses on device @dev. 1940 * If one is found it returns true. 1941 */ 1942 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1943 const unsigned int prefix_len, struct net_device *dev) 1944 { 1945 const struct inet6_ifaddr *ifa; 1946 const struct inet6_dev *idev; 1947 bool ret = false; 1948 1949 rcu_read_lock(); 1950 idev = __in6_dev_get(dev); 1951 if (idev) { 1952 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1953 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1954 if (ret) 1955 break; 1956 } 1957 } 1958 rcu_read_unlock(); 1959 1960 return ret; 1961 } 1962 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1963 1964 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1965 { 1966 const struct inet6_ifaddr *ifa; 1967 const struct inet6_dev *idev; 1968 int onlink; 1969 1970 onlink = 0; 1971 rcu_read_lock(); 1972 idev = __in6_dev_get(dev); 1973 if (idev) { 1974 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1975 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1976 ifa->prefix_len); 1977 if (onlink) 1978 break; 1979 } 1980 } 1981 rcu_read_unlock(); 1982 return onlink; 1983 } 1984 EXPORT_SYMBOL(ipv6_chk_prefix); 1985 1986 /** 1987 * ipv6_dev_find - find the first device with a given source address. 1988 * @net: the net namespace 1989 * @addr: the source address 1990 * 1991 * The caller should be protected by RCU, or RTNL. 1992 */ 1993 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr) 1994 { 1995 unsigned int hash = inet6_addr_hash(net, addr); 1996 struct inet6_ifaddr *ifp, *result = NULL; 1997 struct net_device *dev = NULL; 1998 1999 rcu_read_lock(); 2000 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 2001 if (net_eq(dev_net(ifp->idev->dev), net) && 2002 ipv6_addr_equal(&ifp->addr, addr)) { 2003 result = ifp; 2004 break; 2005 } 2006 } 2007 2008 if (!result) { 2009 struct rt6_info *rt; 2010 2011 rt = rt6_lookup(net, addr, NULL, 0, NULL, 0); 2012 if (rt) { 2013 dev = rt->dst.dev; 2014 ip6_rt_put(rt); 2015 } 2016 } else { 2017 dev = result->idev->dev; 2018 } 2019 rcu_read_unlock(); 2020 2021 return dev; 2022 } 2023 EXPORT_SYMBOL(ipv6_dev_find); 2024 2025 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 2026 struct net_device *dev, int strict) 2027 { 2028 unsigned int hash = inet6_addr_hash(net, addr); 2029 struct inet6_ifaddr *ifp, *result = NULL; 2030 2031 rcu_read_lock(); 2032 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 2033 if (!net_eq(dev_net(ifp->idev->dev), net)) 2034 continue; 2035 if (ipv6_addr_equal(&ifp->addr, addr)) { 2036 if (!dev || ifp->idev->dev == dev || 2037 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 2038 result = ifp; 2039 in6_ifa_hold(ifp); 2040 break; 2041 } 2042 } 2043 } 2044 rcu_read_unlock(); 2045 2046 return result; 2047 } 2048 2049 /* Gets referenced address, destroys ifaddr */ 2050 2051 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 2052 { 2053 if (dad_failed) 2054 ifp->flags |= IFA_F_DADFAILED; 2055 2056 if (ifp->flags&IFA_F_TEMPORARY) { 2057 struct inet6_ifaddr *ifpub; 2058 spin_lock_bh(&ifp->lock); 2059 ifpub = ifp->ifpub; 2060 if (ifpub) { 2061 in6_ifa_hold(ifpub); 2062 spin_unlock_bh(&ifp->lock); 2063 ipv6_create_tempaddr(ifpub, true); 2064 in6_ifa_put(ifpub); 2065 } else { 2066 spin_unlock_bh(&ifp->lock); 2067 } 2068 ipv6_del_addr(ifp); 2069 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) { 2070 spin_lock_bh(&ifp->lock); 2071 addrconf_del_dad_work(ifp); 2072 ifp->flags |= IFA_F_TENTATIVE; 2073 if (dad_failed) 2074 ifp->flags &= ~IFA_F_OPTIMISTIC; 2075 spin_unlock_bh(&ifp->lock); 2076 if (dad_failed) 2077 ipv6_ifa_notify(0, ifp); 2078 in6_ifa_put(ifp); 2079 } else { 2080 ipv6_del_addr(ifp); 2081 } 2082 } 2083 2084 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 2085 { 2086 int err = -ENOENT; 2087 2088 spin_lock_bh(&ifp->lock); 2089 if (ifp->state == INET6_IFADDR_STATE_DAD) { 2090 ifp->state = INET6_IFADDR_STATE_POSTDAD; 2091 err = 0; 2092 } 2093 spin_unlock_bh(&ifp->lock); 2094 2095 return err; 2096 } 2097 2098 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp) 2099 { 2100 struct inet6_dev *idev = ifp->idev; 2101 struct net *net = dev_net(ifp->idev->dev); 2102 2103 if (addrconf_dad_end(ifp)) { 2104 in6_ifa_put(ifp); 2105 return; 2106 } 2107 2108 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n", 2109 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source); 2110 2111 spin_lock_bh(&ifp->lock); 2112 2113 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 2114 struct in6_addr new_addr; 2115 struct inet6_ifaddr *ifp2; 2116 int retries = ifp->stable_privacy_retry + 1; 2117 struct ifa6_config cfg = { 2118 .pfx = &new_addr, 2119 .plen = ifp->prefix_len, 2120 .ifa_flags = ifp->flags, 2121 .valid_lft = ifp->valid_lft, 2122 .preferred_lft = ifp->prefered_lft, 2123 .scope = ifp->scope, 2124 }; 2125 2126 if (retries > net->ipv6.sysctl.idgen_retries) { 2127 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 2128 ifp->idev->dev->name); 2129 goto errdad; 2130 } 2131 2132 new_addr = ifp->addr; 2133 if (ipv6_generate_stable_address(&new_addr, retries, 2134 idev)) 2135 goto errdad; 2136 2137 spin_unlock_bh(&ifp->lock); 2138 2139 if (idev->cnf.max_addresses && 2140 ipv6_count_addresses(idev) >= 2141 idev->cnf.max_addresses) 2142 goto lock_errdad; 2143 2144 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 2145 ifp->idev->dev->name); 2146 2147 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL); 2148 if (IS_ERR(ifp2)) 2149 goto lock_errdad; 2150 2151 spin_lock_bh(&ifp2->lock); 2152 ifp2->stable_privacy_retry = retries; 2153 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2154 spin_unlock_bh(&ifp2->lock); 2155 2156 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2157 in6_ifa_put(ifp2); 2158 lock_errdad: 2159 spin_lock_bh(&ifp->lock); 2160 } 2161 2162 errdad: 2163 /* transition from _POSTDAD to _ERRDAD */ 2164 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2165 spin_unlock_bh(&ifp->lock); 2166 2167 addrconf_mod_dad_work(ifp, 0); 2168 in6_ifa_put(ifp); 2169 } 2170 2171 /* Join to solicited addr multicast group. 2172 * caller must hold RTNL */ 2173 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2174 { 2175 struct in6_addr maddr; 2176 2177 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2178 return; 2179 2180 addrconf_addr_solict_mult(addr, &maddr); 2181 ipv6_dev_mc_inc(dev, &maddr); 2182 } 2183 2184 /* caller must hold RTNL */ 2185 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2186 { 2187 struct in6_addr maddr; 2188 2189 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2190 return; 2191 2192 addrconf_addr_solict_mult(addr, &maddr); 2193 __ipv6_dev_mc_dec(idev, &maddr); 2194 } 2195 2196 /* caller must hold RTNL */ 2197 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2198 { 2199 struct in6_addr addr; 2200 2201 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2202 return; 2203 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2204 if (ipv6_addr_any(&addr)) 2205 return; 2206 __ipv6_dev_ac_inc(ifp->idev, &addr); 2207 } 2208 2209 /* caller must hold RTNL */ 2210 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2211 { 2212 struct in6_addr addr; 2213 2214 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2215 return; 2216 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2217 if (ipv6_addr_any(&addr)) 2218 return; 2219 __ipv6_dev_ac_dec(ifp->idev, &addr); 2220 } 2221 2222 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2223 { 2224 switch (dev->addr_len) { 2225 case ETH_ALEN: 2226 memcpy(eui, dev->dev_addr, 3); 2227 eui[3] = 0xFF; 2228 eui[4] = 0xFE; 2229 memcpy(eui + 5, dev->dev_addr + 3, 3); 2230 break; 2231 case EUI64_ADDR_LEN: 2232 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2233 eui[0] ^= 2; 2234 break; 2235 default: 2236 return -1; 2237 } 2238 2239 return 0; 2240 } 2241 2242 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2243 { 2244 union fwnet_hwaddr *ha; 2245 2246 if (dev->addr_len != FWNET_ALEN) 2247 return -1; 2248 2249 ha = (union fwnet_hwaddr *)dev->dev_addr; 2250 2251 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2252 eui[0] ^= 2; 2253 return 0; 2254 } 2255 2256 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2257 { 2258 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2259 if (dev->addr_len != ARCNET_ALEN) 2260 return -1; 2261 memset(eui, 0, 7); 2262 eui[7] = *(u8 *)dev->dev_addr; 2263 return 0; 2264 } 2265 2266 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2267 { 2268 if (dev->addr_len != INFINIBAND_ALEN) 2269 return -1; 2270 memcpy(eui, dev->dev_addr + 12, 8); 2271 eui[0] |= 2; 2272 return 0; 2273 } 2274 2275 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2276 { 2277 if (addr == 0) 2278 return -1; 2279 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2280 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2281 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2282 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2283 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2284 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2285 eui[1] = 0; 2286 eui[2] = 0x5E; 2287 eui[3] = 0xFE; 2288 memcpy(eui + 4, &addr, 4); 2289 return 0; 2290 } 2291 2292 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2293 { 2294 if (dev->priv_flags & IFF_ISATAP) 2295 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2296 return -1; 2297 } 2298 2299 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2300 { 2301 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2302 } 2303 2304 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2305 { 2306 memcpy(eui, dev->perm_addr, 3); 2307 memcpy(eui + 5, dev->perm_addr + 3, 3); 2308 eui[3] = 0xFF; 2309 eui[4] = 0xFE; 2310 eui[0] ^= 2; 2311 return 0; 2312 } 2313 2314 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2315 { 2316 switch (dev->type) { 2317 case ARPHRD_ETHER: 2318 case ARPHRD_FDDI: 2319 return addrconf_ifid_eui48(eui, dev); 2320 case ARPHRD_ARCNET: 2321 return addrconf_ifid_arcnet(eui, dev); 2322 case ARPHRD_INFINIBAND: 2323 return addrconf_ifid_infiniband(eui, dev); 2324 case ARPHRD_SIT: 2325 return addrconf_ifid_sit(eui, dev); 2326 case ARPHRD_IPGRE: 2327 case ARPHRD_TUNNEL: 2328 return addrconf_ifid_gre(eui, dev); 2329 case ARPHRD_6LOWPAN: 2330 return addrconf_ifid_6lowpan(eui, dev); 2331 case ARPHRD_IEEE1394: 2332 return addrconf_ifid_ieee1394(eui, dev); 2333 case ARPHRD_TUNNEL6: 2334 case ARPHRD_IP6GRE: 2335 case ARPHRD_RAWIP: 2336 return addrconf_ifid_ip6tnl(eui, dev); 2337 } 2338 return -1; 2339 } 2340 2341 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2342 { 2343 int err = -1; 2344 struct inet6_ifaddr *ifp; 2345 2346 read_lock_bh(&idev->lock); 2347 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2348 if (ifp->scope > IFA_LINK) 2349 break; 2350 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2351 memcpy(eui, ifp->addr.s6_addr+8, 8); 2352 err = 0; 2353 break; 2354 } 2355 } 2356 read_unlock_bh(&idev->lock); 2357 return err; 2358 } 2359 2360 /* Generation of a randomized Interface Identifier 2361 * draft-ietf-6man-rfc4941bis, Section 3.3.1 2362 */ 2363 2364 static void ipv6_gen_rnd_iid(struct in6_addr *addr) 2365 { 2366 regen: 2367 get_random_bytes(&addr->s6_addr[8], 8); 2368 2369 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1: 2370 * check if generated address is not inappropriate: 2371 * 2372 * - Reserved IPv6 Interface Identifers 2373 * - XXX: already assigned to an address on the device 2374 */ 2375 2376 /* Subnet-router anycast: 0000:0000:0000:0000 */ 2377 if (!(addr->s6_addr32[2] | addr->s6_addr32[3])) 2378 goto regen; 2379 2380 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212 2381 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213 2382 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF 2383 */ 2384 if (ntohl(addr->s6_addr32[2]) == 0x02005eff && 2385 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000) 2386 goto regen; 2387 2388 /* Reserved subnet anycast addresses */ 2389 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff && 2390 ntohl(addr->s6_addr32[3]) >= 0Xffffff80) 2391 goto regen; 2392 } 2393 2394 /* 2395 * Add prefix route. 2396 */ 2397 2398 static void 2399 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric, 2400 struct net_device *dev, unsigned long expires, 2401 u32 flags, gfp_t gfp_flags) 2402 { 2403 struct fib6_config cfg = { 2404 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2405 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF, 2406 .fc_ifindex = dev->ifindex, 2407 .fc_expires = expires, 2408 .fc_dst_len = plen, 2409 .fc_flags = RTF_UP | flags, 2410 .fc_nlinfo.nl_net = dev_net(dev), 2411 .fc_protocol = RTPROT_KERNEL, 2412 .fc_type = RTN_UNICAST, 2413 }; 2414 2415 cfg.fc_dst = *pfx; 2416 2417 /* Prevent useless cloning on PtP SIT. 2418 This thing is done here expecting that the whole 2419 class of non-broadcast devices need not cloning. 2420 */ 2421 #if IS_ENABLED(CONFIG_IPV6_SIT) 2422 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2423 cfg.fc_flags |= RTF_NONEXTHOP; 2424 #endif 2425 2426 ip6_route_add(&cfg, gfp_flags, NULL); 2427 } 2428 2429 2430 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2431 int plen, 2432 const struct net_device *dev, 2433 u32 flags, u32 noflags, 2434 bool no_gw) 2435 { 2436 struct fib6_node *fn; 2437 struct fib6_info *rt = NULL; 2438 struct fib6_table *table; 2439 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2440 2441 table = fib6_get_table(dev_net(dev), tb_id); 2442 if (!table) 2443 return NULL; 2444 2445 rcu_read_lock(); 2446 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true); 2447 if (!fn) 2448 goto out; 2449 2450 for_each_fib6_node_rt_rcu(fn) { 2451 /* prefix routes only use builtin fib6_nh */ 2452 if (rt->nh) 2453 continue; 2454 2455 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex) 2456 continue; 2457 if (no_gw && rt->fib6_nh->fib_nh_gw_family) 2458 continue; 2459 if ((rt->fib6_flags & flags) != flags) 2460 continue; 2461 if ((rt->fib6_flags & noflags) != 0) 2462 continue; 2463 if (!fib6_info_hold_safe(rt)) 2464 continue; 2465 break; 2466 } 2467 out: 2468 rcu_read_unlock(); 2469 return rt; 2470 } 2471 2472 2473 /* Create "default" multicast route to the interface */ 2474 2475 static void addrconf_add_mroute(struct net_device *dev) 2476 { 2477 struct fib6_config cfg = { 2478 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2479 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2480 .fc_ifindex = dev->ifindex, 2481 .fc_dst_len = 8, 2482 .fc_flags = RTF_UP, 2483 .fc_type = RTN_UNICAST, 2484 .fc_nlinfo.nl_net = dev_net(dev), 2485 }; 2486 2487 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2488 2489 ip6_route_add(&cfg, GFP_KERNEL, NULL); 2490 } 2491 2492 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2493 { 2494 struct inet6_dev *idev; 2495 2496 ASSERT_RTNL(); 2497 2498 idev = ipv6_find_idev(dev); 2499 if (IS_ERR(idev)) 2500 return idev; 2501 2502 if (idev->cnf.disable_ipv6) 2503 return ERR_PTR(-EACCES); 2504 2505 /* Add default multicast route */ 2506 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2507 addrconf_add_mroute(dev); 2508 2509 return idev; 2510 } 2511 2512 static void manage_tempaddrs(struct inet6_dev *idev, 2513 struct inet6_ifaddr *ifp, 2514 __u32 valid_lft, __u32 prefered_lft, 2515 bool create, unsigned long now) 2516 { 2517 u32 flags; 2518 struct inet6_ifaddr *ift; 2519 2520 read_lock_bh(&idev->lock); 2521 /* update all temporary addresses in the list */ 2522 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2523 int age, max_valid, max_prefered; 2524 2525 if (ifp != ift->ifpub) 2526 continue; 2527 2528 /* RFC 4941 section 3.3: 2529 * If a received option will extend the lifetime of a public 2530 * address, the lifetimes of temporary addresses should 2531 * be extended, subject to the overall constraint that no 2532 * temporary addresses should ever remain "valid" or "preferred" 2533 * for a time longer than (TEMP_VALID_LIFETIME) or 2534 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2535 */ 2536 age = (now - ift->cstamp) / HZ; 2537 max_valid = idev->cnf.temp_valid_lft - age; 2538 if (max_valid < 0) 2539 max_valid = 0; 2540 2541 max_prefered = idev->cnf.temp_prefered_lft - 2542 idev->desync_factor - age; 2543 if (max_prefered < 0) 2544 max_prefered = 0; 2545 2546 if (valid_lft > max_valid) 2547 valid_lft = max_valid; 2548 2549 if (prefered_lft > max_prefered) 2550 prefered_lft = max_prefered; 2551 2552 spin_lock(&ift->lock); 2553 flags = ift->flags; 2554 ift->valid_lft = valid_lft; 2555 ift->prefered_lft = prefered_lft; 2556 ift->tstamp = now; 2557 if (prefered_lft > 0) 2558 ift->flags &= ~IFA_F_DEPRECATED; 2559 2560 spin_unlock(&ift->lock); 2561 if (!(flags&IFA_F_TENTATIVE)) 2562 ipv6_ifa_notify(0, ift); 2563 } 2564 2565 if ((create || list_empty(&idev->tempaddr_list)) && 2566 idev->cnf.use_tempaddr > 0) { 2567 /* When a new public address is created as described 2568 * in [ADDRCONF], also create a new temporary address. 2569 * Also create a temporary address if it's enabled but 2570 * no temporary address currently exists. 2571 */ 2572 read_unlock_bh(&idev->lock); 2573 ipv6_create_tempaddr(ifp, false); 2574 } else { 2575 read_unlock_bh(&idev->lock); 2576 } 2577 } 2578 2579 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2580 { 2581 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2582 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2583 } 2584 2585 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2586 const struct prefix_info *pinfo, 2587 struct inet6_dev *in6_dev, 2588 const struct in6_addr *addr, int addr_type, 2589 u32 addr_flags, bool sllao, bool tokenized, 2590 __u32 valid_lft, u32 prefered_lft) 2591 { 2592 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2593 int create = 0; 2594 2595 if (!ifp && valid_lft) { 2596 int max_addresses = in6_dev->cnf.max_addresses; 2597 struct ifa6_config cfg = { 2598 .pfx = addr, 2599 .plen = pinfo->prefix_len, 2600 .ifa_flags = addr_flags, 2601 .valid_lft = valid_lft, 2602 .preferred_lft = prefered_lft, 2603 .scope = addr_type & IPV6_ADDR_SCOPE_MASK, 2604 }; 2605 2606 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2607 if ((net->ipv6.devconf_all->optimistic_dad || 2608 in6_dev->cnf.optimistic_dad) && 2609 !net->ipv6.devconf_all->forwarding && sllao) 2610 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 2611 #endif 2612 2613 /* Do not allow to create too much of autoconfigured 2614 * addresses; this would be too easy way to crash kernel. 2615 */ 2616 if (!max_addresses || 2617 ipv6_count_addresses(in6_dev) < max_addresses) 2618 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL); 2619 2620 if (IS_ERR_OR_NULL(ifp)) 2621 return -1; 2622 2623 create = 1; 2624 spin_lock_bh(&ifp->lock); 2625 ifp->flags |= IFA_F_MANAGETEMPADDR; 2626 ifp->cstamp = jiffies; 2627 ifp->tokenized = tokenized; 2628 spin_unlock_bh(&ifp->lock); 2629 addrconf_dad_start(ifp); 2630 } 2631 2632 if (ifp) { 2633 u32 flags; 2634 unsigned long now; 2635 u32 stored_lft; 2636 2637 /* Update lifetime (RFC4862 5.5.3 e) 2638 * We deviate from RFC4862 by honoring all Valid Lifetimes to 2639 * improve the reaction of SLAAC to renumbering events 2640 * (draft-gont-6man-slaac-renum-06, Section 4.2) 2641 */ 2642 spin_lock_bh(&ifp->lock); 2643 now = jiffies; 2644 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2645 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2646 else 2647 stored_lft = 0; 2648 2649 if (!create && stored_lft) { 2650 ifp->valid_lft = valid_lft; 2651 ifp->prefered_lft = prefered_lft; 2652 ifp->tstamp = now; 2653 flags = ifp->flags; 2654 ifp->flags &= ~IFA_F_DEPRECATED; 2655 spin_unlock_bh(&ifp->lock); 2656 2657 if (!(flags&IFA_F_TENTATIVE)) 2658 ipv6_ifa_notify(0, ifp); 2659 } else 2660 spin_unlock_bh(&ifp->lock); 2661 2662 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2663 create, now); 2664 2665 in6_ifa_put(ifp); 2666 addrconf_verify(); 2667 } 2668 2669 return 0; 2670 } 2671 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2672 2673 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2674 { 2675 struct prefix_info *pinfo; 2676 __u32 valid_lft; 2677 __u32 prefered_lft; 2678 int addr_type, err; 2679 u32 addr_flags = 0; 2680 struct inet6_dev *in6_dev; 2681 struct net *net = dev_net(dev); 2682 2683 pinfo = (struct prefix_info *) opt; 2684 2685 if (len < sizeof(struct prefix_info)) { 2686 netdev_dbg(dev, "addrconf: prefix option too short\n"); 2687 return; 2688 } 2689 2690 /* 2691 * Validation checks ([ADDRCONF], page 19) 2692 */ 2693 2694 addr_type = ipv6_addr_type(&pinfo->prefix); 2695 2696 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2697 return; 2698 2699 valid_lft = ntohl(pinfo->valid); 2700 prefered_lft = ntohl(pinfo->prefered); 2701 2702 if (prefered_lft > valid_lft) { 2703 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2704 return; 2705 } 2706 2707 in6_dev = in6_dev_get(dev); 2708 2709 if (!in6_dev) { 2710 net_dbg_ratelimited("addrconf: device %s not configured\n", 2711 dev->name); 2712 return; 2713 } 2714 2715 /* 2716 * Two things going on here: 2717 * 1) Add routes for on-link prefixes 2718 * 2) Configure prefixes with the auto flag set 2719 */ 2720 2721 if (pinfo->onlink) { 2722 struct fib6_info *rt; 2723 unsigned long rt_expires; 2724 2725 /* Avoid arithmetic overflow. Really, we could 2726 * save rt_expires in seconds, likely valid_lft, 2727 * but it would require division in fib gc, that it 2728 * not good. 2729 */ 2730 if (HZ > USER_HZ) 2731 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2732 else 2733 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2734 2735 if (addrconf_finite_timeout(rt_expires)) 2736 rt_expires *= HZ; 2737 2738 rt = addrconf_get_prefix_route(&pinfo->prefix, 2739 pinfo->prefix_len, 2740 dev, 2741 RTF_ADDRCONF | RTF_PREFIX_RT, 2742 RTF_DEFAULT, true); 2743 2744 if (rt) { 2745 /* Autoconf prefix route */ 2746 if (valid_lft == 0) { 2747 ip6_del_rt(net, rt, false); 2748 rt = NULL; 2749 } else if (addrconf_finite_timeout(rt_expires)) { 2750 /* not infinity */ 2751 fib6_set_expires(rt, jiffies + rt_expires); 2752 } else { 2753 fib6_clean_expires(rt); 2754 } 2755 } else if (valid_lft) { 2756 clock_t expires = 0; 2757 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2758 if (addrconf_finite_timeout(rt_expires)) { 2759 /* not infinity */ 2760 flags |= RTF_EXPIRES; 2761 expires = jiffies_to_clock_t(rt_expires); 2762 } 2763 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2764 0, dev, expires, flags, 2765 GFP_ATOMIC); 2766 } 2767 fib6_info_release(rt); 2768 } 2769 2770 /* Try to figure out our local address for this prefix */ 2771 2772 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2773 struct in6_addr addr; 2774 bool tokenized = false, dev_addr_generated = false; 2775 2776 if (pinfo->prefix_len == 64) { 2777 memcpy(&addr, &pinfo->prefix, 8); 2778 2779 if (!ipv6_addr_any(&in6_dev->token)) { 2780 read_lock_bh(&in6_dev->lock); 2781 memcpy(addr.s6_addr + 8, 2782 in6_dev->token.s6_addr + 8, 8); 2783 read_unlock_bh(&in6_dev->lock); 2784 tokenized = true; 2785 } else if (is_addr_mode_generate_stable(in6_dev) && 2786 !ipv6_generate_stable_address(&addr, 0, 2787 in6_dev)) { 2788 addr_flags |= IFA_F_STABLE_PRIVACY; 2789 goto ok; 2790 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2791 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2792 goto put; 2793 } else { 2794 dev_addr_generated = true; 2795 } 2796 goto ok; 2797 } 2798 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2799 pinfo->prefix_len); 2800 goto put; 2801 2802 ok: 2803 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2804 &addr, addr_type, 2805 addr_flags, sllao, 2806 tokenized, valid_lft, 2807 prefered_lft); 2808 if (err) 2809 goto put; 2810 2811 /* Ignore error case here because previous prefix add addr was 2812 * successful which will be notified. 2813 */ 2814 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2815 addr_type, addr_flags, sllao, 2816 tokenized, valid_lft, 2817 prefered_lft, 2818 dev_addr_generated); 2819 } 2820 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2821 put: 2822 in6_dev_put(in6_dev); 2823 } 2824 2825 static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev, 2826 struct in6_ifreq *ireq) 2827 { 2828 struct ip_tunnel_parm p = { }; 2829 int err; 2830 2831 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4)) 2832 return -EADDRNOTAVAIL; 2833 2834 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3]; 2835 p.iph.version = 4; 2836 p.iph.ihl = 5; 2837 p.iph.protocol = IPPROTO_IPV6; 2838 p.iph.ttl = 64; 2839 2840 if (!dev->netdev_ops->ndo_tunnel_ctl) 2841 return -EOPNOTSUPP; 2842 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL); 2843 if (err) 2844 return err; 2845 2846 dev = __dev_get_by_name(net, p.name); 2847 if (!dev) 2848 return -ENOBUFS; 2849 return dev_open(dev, NULL); 2850 } 2851 2852 /* 2853 * Set destination address. 2854 * Special case for SIT interfaces where we create a new "virtual" 2855 * device. 2856 */ 2857 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2858 { 2859 struct net_device *dev; 2860 struct in6_ifreq ireq; 2861 int err = -ENODEV; 2862 2863 if (!IS_ENABLED(CONFIG_IPV6_SIT)) 2864 return -ENODEV; 2865 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2866 return -EFAULT; 2867 2868 rtnl_lock(); 2869 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2870 if (dev && dev->type == ARPHRD_SIT) 2871 err = addrconf_set_sit_dstaddr(net, dev, &ireq); 2872 rtnl_unlock(); 2873 return err; 2874 } 2875 2876 static int ipv6_mc_config(struct sock *sk, bool join, 2877 const struct in6_addr *addr, int ifindex) 2878 { 2879 int ret; 2880 2881 ASSERT_RTNL(); 2882 2883 lock_sock(sk); 2884 if (join) 2885 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2886 else 2887 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2888 release_sock(sk); 2889 2890 return ret; 2891 } 2892 2893 /* 2894 * Manual configuration of address on an interface 2895 */ 2896 static int inet6_addr_add(struct net *net, int ifindex, 2897 struct ifa6_config *cfg, 2898 struct netlink_ext_ack *extack) 2899 { 2900 struct inet6_ifaddr *ifp; 2901 struct inet6_dev *idev; 2902 struct net_device *dev; 2903 unsigned long timeout; 2904 clock_t expires; 2905 u32 flags; 2906 2907 ASSERT_RTNL(); 2908 2909 if (cfg->plen > 128) 2910 return -EINVAL; 2911 2912 /* check the lifetime */ 2913 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 2914 return -EINVAL; 2915 2916 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) 2917 return -EINVAL; 2918 2919 dev = __dev_get_by_index(net, ifindex); 2920 if (!dev) 2921 return -ENODEV; 2922 2923 idev = addrconf_add_dev(dev); 2924 if (IS_ERR(idev)) 2925 return PTR_ERR(idev); 2926 2927 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2928 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2929 true, cfg->pfx, ifindex); 2930 2931 if (ret < 0) 2932 return ret; 2933 } 2934 2935 cfg->scope = ipv6_addr_scope(cfg->pfx); 2936 2937 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 2938 if (addrconf_finite_timeout(timeout)) { 2939 expires = jiffies_to_clock_t(timeout * HZ); 2940 cfg->valid_lft = timeout; 2941 flags = RTF_EXPIRES; 2942 } else { 2943 expires = 0; 2944 flags = 0; 2945 cfg->ifa_flags |= IFA_F_PERMANENT; 2946 } 2947 2948 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 2949 if (addrconf_finite_timeout(timeout)) { 2950 if (timeout == 0) 2951 cfg->ifa_flags |= IFA_F_DEPRECATED; 2952 cfg->preferred_lft = timeout; 2953 } 2954 2955 ifp = ipv6_add_addr(idev, cfg, true, extack); 2956 if (!IS_ERR(ifp)) { 2957 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 2958 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 2959 ifp->rt_priority, dev, expires, 2960 flags, GFP_KERNEL); 2961 } 2962 2963 /* Send a netlink notification if DAD is enabled and 2964 * optimistic flag is not set 2965 */ 2966 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD))) 2967 ipv6_ifa_notify(0, ifp); 2968 /* 2969 * Note that section 3.1 of RFC 4429 indicates 2970 * that the Optimistic flag should not be set for 2971 * manually configured addresses 2972 */ 2973 addrconf_dad_start(ifp); 2974 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR) 2975 manage_tempaddrs(idev, ifp, cfg->valid_lft, 2976 cfg->preferred_lft, true, jiffies); 2977 in6_ifa_put(ifp); 2978 addrconf_verify_rtnl(); 2979 return 0; 2980 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2981 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false, 2982 cfg->pfx, ifindex); 2983 } 2984 2985 return PTR_ERR(ifp); 2986 } 2987 2988 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2989 const struct in6_addr *pfx, unsigned int plen) 2990 { 2991 struct inet6_ifaddr *ifp; 2992 struct inet6_dev *idev; 2993 struct net_device *dev; 2994 2995 if (plen > 128) 2996 return -EINVAL; 2997 2998 dev = __dev_get_by_index(net, ifindex); 2999 if (!dev) 3000 return -ENODEV; 3001 3002 idev = __in6_dev_get(dev); 3003 if (!idev) 3004 return -ENXIO; 3005 3006 read_lock_bh(&idev->lock); 3007 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3008 if (ifp->prefix_len == plen && 3009 ipv6_addr_equal(pfx, &ifp->addr)) { 3010 in6_ifa_hold(ifp); 3011 read_unlock_bh(&idev->lock); 3012 3013 if (!(ifp->flags & IFA_F_TEMPORARY) && 3014 (ifa_flags & IFA_F_MANAGETEMPADDR)) 3015 manage_tempaddrs(idev, ifp, 0, 0, false, 3016 jiffies); 3017 ipv6_del_addr(ifp); 3018 addrconf_verify_rtnl(); 3019 if (ipv6_addr_is_multicast(pfx)) { 3020 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 3021 false, pfx, dev->ifindex); 3022 } 3023 return 0; 3024 } 3025 } 3026 read_unlock_bh(&idev->lock); 3027 return -EADDRNOTAVAIL; 3028 } 3029 3030 3031 int addrconf_add_ifaddr(struct net *net, void __user *arg) 3032 { 3033 struct ifa6_config cfg = { 3034 .ifa_flags = IFA_F_PERMANENT, 3035 .preferred_lft = INFINITY_LIFE_TIME, 3036 .valid_lft = INFINITY_LIFE_TIME, 3037 }; 3038 struct in6_ifreq ireq; 3039 int err; 3040 3041 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3042 return -EPERM; 3043 3044 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3045 return -EFAULT; 3046 3047 cfg.pfx = &ireq.ifr6_addr; 3048 cfg.plen = ireq.ifr6_prefixlen; 3049 3050 rtnl_lock(); 3051 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL); 3052 rtnl_unlock(); 3053 return err; 3054 } 3055 3056 int addrconf_del_ifaddr(struct net *net, void __user *arg) 3057 { 3058 struct in6_ifreq ireq; 3059 int err; 3060 3061 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3062 return -EPERM; 3063 3064 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3065 return -EFAULT; 3066 3067 rtnl_lock(); 3068 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 3069 ireq.ifr6_prefixlen); 3070 rtnl_unlock(); 3071 return err; 3072 } 3073 3074 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 3075 int plen, int scope) 3076 { 3077 struct inet6_ifaddr *ifp; 3078 struct ifa6_config cfg = { 3079 .pfx = addr, 3080 .plen = plen, 3081 .ifa_flags = IFA_F_PERMANENT, 3082 .valid_lft = INFINITY_LIFE_TIME, 3083 .preferred_lft = INFINITY_LIFE_TIME, 3084 .scope = scope 3085 }; 3086 3087 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3088 if (!IS_ERR(ifp)) { 3089 spin_lock_bh(&ifp->lock); 3090 ifp->flags &= ~IFA_F_TENTATIVE; 3091 spin_unlock_bh(&ifp->lock); 3092 rt_genid_bump_ipv6(dev_net(idev->dev)); 3093 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3094 in6_ifa_put(ifp); 3095 } 3096 } 3097 3098 #if IS_ENABLED(CONFIG_IPV6_SIT) 3099 static void sit_add_v4_addrs(struct inet6_dev *idev) 3100 { 3101 struct in6_addr addr; 3102 struct net_device *dev; 3103 struct net *net = dev_net(idev->dev); 3104 int scope, plen; 3105 u32 pflags = 0; 3106 3107 ASSERT_RTNL(); 3108 3109 memset(&addr, 0, sizeof(struct in6_addr)); 3110 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 3111 3112 if (idev->dev->flags&IFF_POINTOPOINT) { 3113 addr.s6_addr32[0] = htonl(0xfe800000); 3114 scope = IFA_LINK; 3115 plen = 64; 3116 } else { 3117 scope = IPV6_ADDR_COMPATv4; 3118 plen = 96; 3119 pflags |= RTF_NONEXTHOP; 3120 } 3121 3122 if (addr.s6_addr32[3]) { 3123 add_addr(idev, &addr, plen, scope); 3124 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags, 3125 GFP_KERNEL); 3126 return; 3127 } 3128 3129 for_each_netdev(net, dev) { 3130 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3131 if (in_dev && (dev->flags & IFF_UP)) { 3132 struct in_ifaddr *ifa; 3133 int flag = scope; 3134 3135 in_dev_for_each_ifa_rtnl(ifa, in_dev) { 3136 addr.s6_addr32[3] = ifa->ifa_local; 3137 3138 if (ifa->ifa_scope == RT_SCOPE_LINK) 3139 continue; 3140 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3141 if (idev->dev->flags&IFF_POINTOPOINT) 3142 continue; 3143 flag |= IFA_HOST; 3144 } 3145 3146 add_addr(idev, &addr, plen, flag); 3147 addrconf_prefix_route(&addr, plen, 0, idev->dev, 3148 0, pflags, GFP_KERNEL); 3149 } 3150 } 3151 } 3152 } 3153 #endif 3154 3155 static void init_loopback(struct net_device *dev) 3156 { 3157 struct inet6_dev *idev; 3158 3159 /* ::1 */ 3160 3161 ASSERT_RTNL(); 3162 3163 idev = ipv6_find_idev(dev); 3164 if (IS_ERR(idev)) { 3165 pr_debug("%s: add_dev failed\n", __func__); 3166 return; 3167 } 3168 3169 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 3170 } 3171 3172 void addrconf_add_linklocal(struct inet6_dev *idev, 3173 const struct in6_addr *addr, u32 flags) 3174 { 3175 struct ifa6_config cfg = { 3176 .pfx = addr, 3177 .plen = 64, 3178 .ifa_flags = flags | IFA_F_PERMANENT, 3179 .valid_lft = INFINITY_LIFE_TIME, 3180 .preferred_lft = INFINITY_LIFE_TIME, 3181 .scope = IFA_LINK 3182 }; 3183 struct inet6_ifaddr *ifp; 3184 3185 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3186 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad || 3187 idev->cnf.optimistic_dad) && 3188 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3189 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 3190 #endif 3191 3192 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3193 if (!IS_ERR(ifp)) { 3194 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev, 3195 0, 0, GFP_ATOMIC); 3196 addrconf_dad_start(ifp); 3197 in6_ifa_put(ifp); 3198 } 3199 } 3200 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3201 3202 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3203 { 3204 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3205 return true; 3206 3207 if (address.s6_addr32[2] == htonl(0x02005eff) && 3208 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3209 return true; 3210 3211 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3212 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3213 return true; 3214 3215 return false; 3216 } 3217 3218 static int ipv6_generate_stable_address(struct in6_addr *address, 3219 u8 dad_count, 3220 const struct inet6_dev *idev) 3221 { 3222 static DEFINE_SPINLOCK(lock); 3223 static __u32 digest[SHA1_DIGEST_WORDS]; 3224 static __u32 workspace[SHA1_WORKSPACE_WORDS]; 3225 3226 static union { 3227 char __data[SHA1_BLOCK_SIZE]; 3228 struct { 3229 struct in6_addr secret; 3230 __be32 prefix[2]; 3231 unsigned char hwaddr[MAX_ADDR_LEN]; 3232 u8 dad_count; 3233 } __packed; 3234 } data; 3235 3236 struct in6_addr secret; 3237 struct in6_addr temp; 3238 struct net *net = dev_net(idev->dev); 3239 3240 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3241 3242 if (idev->cnf.stable_secret.initialized) 3243 secret = idev->cnf.stable_secret.secret; 3244 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3245 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3246 else 3247 return -1; 3248 3249 retry: 3250 spin_lock_bh(&lock); 3251 3252 sha1_init(digest); 3253 memset(&data, 0, sizeof(data)); 3254 memset(workspace, 0, sizeof(workspace)); 3255 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3256 data.prefix[0] = address->s6_addr32[0]; 3257 data.prefix[1] = address->s6_addr32[1]; 3258 data.secret = secret; 3259 data.dad_count = dad_count; 3260 3261 sha1_transform(digest, data.__data, workspace); 3262 3263 temp = *address; 3264 temp.s6_addr32[2] = (__force __be32)digest[0]; 3265 temp.s6_addr32[3] = (__force __be32)digest[1]; 3266 3267 spin_unlock_bh(&lock); 3268 3269 if (ipv6_reserved_interfaceid(temp)) { 3270 dad_count++; 3271 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3272 return -1; 3273 goto retry; 3274 } 3275 3276 *address = temp; 3277 return 0; 3278 } 3279 3280 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3281 { 3282 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3283 3284 if (s->initialized) 3285 return; 3286 s = &idev->cnf.stable_secret; 3287 get_random_bytes(&s->secret, sizeof(s->secret)); 3288 s->initialized = true; 3289 } 3290 3291 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3292 { 3293 struct in6_addr addr; 3294 3295 /* no link local addresses on L3 master devices */ 3296 if (netif_is_l3_master(idev->dev)) 3297 return; 3298 3299 /* no link local addresses on devices flagged as slaves */ 3300 if (idev->dev->flags & IFF_SLAVE) 3301 return; 3302 3303 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3304 3305 switch (idev->cnf.addr_gen_mode) { 3306 case IN6_ADDR_GEN_MODE_RANDOM: 3307 ipv6_gen_mode_random_init(idev); 3308 fallthrough; 3309 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3310 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3311 addrconf_add_linklocal(idev, &addr, 3312 IFA_F_STABLE_PRIVACY); 3313 else if (prefix_route) 3314 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3315 0, 0, GFP_KERNEL); 3316 break; 3317 case IN6_ADDR_GEN_MODE_EUI64: 3318 /* addrconf_add_linklocal also adds a prefix_route and we 3319 * only need to care about prefix routes if ipv6_generate_eui64 3320 * couldn't generate one. 3321 */ 3322 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3323 addrconf_add_linklocal(idev, &addr, 0); 3324 else if (prefix_route) 3325 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3326 0, 0, GFP_KERNEL); 3327 break; 3328 case IN6_ADDR_GEN_MODE_NONE: 3329 default: 3330 /* will not add any link local address */ 3331 break; 3332 } 3333 } 3334 3335 static void addrconf_dev_config(struct net_device *dev) 3336 { 3337 struct inet6_dev *idev; 3338 3339 ASSERT_RTNL(); 3340 3341 if ((dev->type != ARPHRD_ETHER) && 3342 (dev->type != ARPHRD_FDDI) && 3343 (dev->type != ARPHRD_ARCNET) && 3344 (dev->type != ARPHRD_INFINIBAND) && 3345 (dev->type != ARPHRD_IEEE1394) && 3346 (dev->type != ARPHRD_TUNNEL6) && 3347 (dev->type != ARPHRD_6LOWPAN) && 3348 (dev->type != ARPHRD_IP6GRE) && 3349 (dev->type != ARPHRD_IPGRE) && 3350 (dev->type != ARPHRD_TUNNEL) && 3351 (dev->type != ARPHRD_NONE) && 3352 (dev->type != ARPHRD_RAWIP)) { 3353 /* Alas, we support only Ethernet autoconfiguration. */ 3354 idev = __in6_dev_get(dev); 3355 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP && 3356 dev->flags & IFF_MULTICAST) 3357 ipv6_mc_up(idev); 3358 return; 3359 } 3360 3361 idev = addrconf_add_dev(dev); 3362 if (IS_ERR(idev)) 3363 return; 3364 3365 /* this device type has no EUI support */ 3366 if (dev->type == ARPHRD_NONE && 3367 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3368 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3369 3370 addrconf_addr_gen(idev, false); 3371 } 3372 3373 #if IS_ENABLED(CONFIG_IPV6_SIT) 3374 static void addrconf_sit_config(struct net_device *dev) 3375 { 3376 struct inet6_dev *idev; 3377 3378 ASSERT_RTNL(); 3379 3380 /* 3381 * Configure the tunnel with one of our IPv4 3382 * addresses... we should configure all of 3383 * our v4 addrs in the tunnel 3384 */ 3385 3386 idev = ipv6_find_idev(dev); 3387 if (IS_ERR(idev)) { 3388 pr_debug("%s: add_dev failed\n", __func__); 3389 return; 3390 } 3391 3392 if (dev->priv_flags & IFF_ISATAP) { 3393 addrconf_addr_gen(idev, false); 3394 return; 3395 } 3396 3397 sit_add_v4_addrs(idev); 3398 3399 if (dev->flags&IFF_POINTOPOINT) 3400 addrconf_add_mroute(dev); 3401 } 3402 #endif 3403 3404 #if IS_ENABLED(CONFIG_NET_IPGRE) 3405 static void addrconf_gre_config(struct net_device *dev) 3406 { 3407 struct inet6_dev *idev; 3408 3409 ASSERT_RTNL(); 3410 3411 idev = ipv6_find_idev(dev); 3412 if (IS_ERR(idev)) { 3413 pr_debug("%s: add_dev failed\n", __func__); 3414 return; 3415 } 3416 3417 addrconf_addr_gen(idev, true); 3418 if (dev->flags & IFF_POINTOPOINT) 3419 addrconf_add_mroute(dev); 3420 } 3421 #endif 3422 3423 static int fixup_permanent_addr(struct net *net, 3424 struct inet6_dev *idev, 3425 struct inet6_ifaddr *ifp) 3426 { 3427 /* !fib6_node means the host route was removed from the 3428 * FIB, for example, if 'lo' device is taken down. In that 3429 * case regenerate the host route. 3430 */ 3431 if (!ifp->rt || !ifp->rt->fib6_node) { 3432 struct fib6_info *f6i, *prev; 3433 3434 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false, 3435 GFP_ATOMIC); 3436 if (IS_ERR(f6i)) 3437 return PTR_ERR(f6i); 3438 3439 /* ifp->rt can be accessed outside of rtnl */ 3440 spin_lock(&ifp->lock); 3441 prev = ifp->rt; 3442 ifp->rt = f6i; 3443 spin_unlock(&ifp->lock); 3444 3445 fib6_info_release(prev); 3446 } 3447 3448 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3449 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3450 ifp->rt_priority, idev->dev, 0, 0, 3451 GFP_ATOMIC); 3452 } 3453 3454 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3455 addrconf_dad_start(ifp); 3456 3457 return 0; 3458 } 3459 3460 static void addrconf_permanent_addr(struct net *net, struct net_device *dev) 3461 { 3462 struct inet6_ifaddr *ifp, *tmp; 3463 struct inet6_dev *idev; 3464 3465 idev = __in6_dev_get(dev); 3466 if (!idev) 3467 return; 3468 3469 write_lock_bh(&idev->lock); 3470 3471 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3472 if ((ifp->flags & IFA_F_PERMANENT) && 3473 fixup_permanent_addr(net, idev, ifp) < 0) { 3474 write_unlock_bh(&idev->lock); 3475 in6_ifa_hold(ifp); 3476 ipv6_del_addr(ifp); 3477 write_lock_bh(&idev->lock); 3478 3479 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3480 idev->dev->name, &ifp->addr); 3481 } 3482 } 3483 3484 write_unlock_bh(&idev->lock); 3485 } 3486 3487 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3488 void *ptr) 3489 { 3490 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3491 struct netdev_notifier_change_info *change_info; 3492 struct netdev_notifier_changeupper_info *info; 3493 struct inet6_dev *idev = __in6_dev_get(dev); 3494 struct net *net = dev_net(dev); 3495 int run_pending = 0; 3496 int err; 3497 3498 switch (event) { 3499 case NETDEV_REGISTER: 3500 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3501 idev = ipv6_add_dev(dev); 3502 if (IS_ERR(idev)) 3503 return notifier_from_errno(PTR_ERR(idev)); 3504 } 3505 break; 3506 3507 case NETDEV_CHANGEMTU: 3508 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3509 if (dev->mtu < IPV6_MIN_MTU) { 3510 addrconf_ifdown(dev, dev != net->loopback_dev); 3511 break; 3512 } 3513 3514 if (idev) { 3515 rt6_mtu_change(dev, dev->mtu); 3516 idev->cnf.mtu6 = dev->mtu; 3517 break; 3518 } 3519 3520 /* allocate new idev */ 3521 idev = ipv6_add_dev(dev); 3522 if (IS_ERR(idev)) 3523 break; 3524 3525 /* device is still not ready */ 3526 if (!(idev->if_flags & IF_READY)) 3527 break; 3528 3529 run_pending = 1; 3530 fallthrough; 3531 case NETDEV_UP: 3532 case NETDEV_CHANGE: 3533 if (dev->flags & IFF_SLAVE) 3534 break; 3535 3536 if (idev && idev->cnf.disable_ipv6) 3537 break; 3538 3539 if (event == NETDEV_UP) { 3540 /* restore routes for permanent addresses */ 3541 addrconf_permanent_addr(net, dev); 3542 3543 if (!addrconf_link_ready(dev)) { 3544 /* device is not ready yet. */ 3545 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3546 dev->name); 3547 break; 3548 } 3549 3550 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3551 idev = ipv6_add_dev(dev); 3552 3553 if (!IS_ERR_OR_NULL(idev)) { 3554 idev->if_flags |= IF_READY; 3555 run_pending = 1; 3556 } 3557 } else if (event == NETDEV_CHANGE) { 3558 if (!addrconf_link_ready(dev)) { 3559 /* device is still not ready. */ 3560 rt6_sync_down_dev(dev, event); 3561 break; 3562 } 3563 3564 if (!IS_ERR_OR_NULL(idev)) { 3565 if (idev->if_flags & IF_READY) { 3566 /* device is already configured - 3567 * but resend MLD reports, we might 3568 * have roamed and need to update 3569 * multicast snooping switches 3570 */ 3571 ipv6_mc_up(idev); 3572 change_info = ptr; 3573 if (change_info->flags_changed & IFF_NOARP) 3574 addrconf_dad_run(idev, true); 3575 rt6_sync_up(dev, RTNH_F_LINKDOWN); 3576 break; 3577 } 3578 idev->if_flags |= IF_READY; 3579 } 3580 3581 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3582 dev->name); 3583 3584 run_pending = 1; 3585 } 3586 3587 switch (dev->type) { 3588 #if IS_ENABLED(CONFIG_IPV6_SIT) 3589 case ARPHRD_SIT: 3590 addrconf_sit_config(dev); 3591 break; 3592 #endif 3593 #if IS_ENABLED(CONFIG_NET_IPGRE) 3594 case ARPHRD_IPGRE: 3595 addrconf_gre_config(dev); 3596 break; 3597 #endif 3598 case ARPHRD_LOOPBACK: 3599 init_loopback(dev); 3600 break; 3601 3602 default: 3603 addrconf_dev_config(dev); 3604 break; 3605 } 3606 3607 if (!IS_ERR_OR_NULL(idev)) { 3608 if (run_pending) 3609 addrconf_dad_run(idev, false); 3610 3611 /* Device has an address by now */ 3612 rt6_sync_up(dev, RTNH_F_DEAD); 3613 3614 /* 3615 * If the MTU changed during the interface down, 3616 * when the interface up, the changed MTU must be 3617 * reflected in the idev as well as routers. 3618 */ 3619 if (idev->cnf.mtu6 != dev->mtu && 3620 dev->mtu >= IPV6_MIN_MTU) { 3621 rt6_mtu_change(dev, dev->mtu); 3622 idev->cnf.mtu6 = dev->mtu; 3623 } 3624 idev->tstamp = jiffies; 3625 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3626 3627 /* 3628 * If the changed mtu during down is lower than 3629 * IPV6_MIN_MTU stop IPv6 on this interface. 3630 */ 3631 if (dev->mtu < IPV6_MIN_MTU) 3632 addrconf_ifdown(dev, dev != net->loopback_dev); 3633 } 3634 break; 3635 3636 case NETDEV_DOWN: 3637 case NETDEV_UNREGISTER: 3638 /* 3639 * Remove all addresses from this interface. 3640 */ 3641 addrconf_ifdown(dev, event != NETDEV_DOWN); 3642 break; 3643 3644 case NETDEV_CHANGENAME: 3645 if (idev) { 3646 snmp6_unregister_dev(idev); 3647 addrconf_sysctl_unregister(idev); 3648 err = addrconf_sysctl_register(idev); 3649 if (err) 3650 return notifier_from_errno(err); 3651 err = snmp6_register_dev(idev); 3652 if (err) { 3653 addrconf_sysctl_unregister(idev); 3654 return notifier_from_errno(err); 3655 } 3656 } 3657 break; 3658 3659 case NETDEV_PRE_TYPE_CHANGE: 3660 case NETDEV_POST_TYPE_CHANGE: 3661 if (idev) 3662 addrconf_type_change(dev, event); 3663 break; 3664 3665 case NETDEV_CHANGEUPPER: 3666 info = ptr; 3667 3668 /* flush all routes if dev is linked to or unlinked from 3669 * an L3 master device (e.g., VRF) 3670 */ 3671 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3672 addrconf_ifdown(dev, false); 3673 } 3674 3675 return NOTIFY_OK; 3676 } 3677 3678 /* 3679 * addrconf module should be notified of a device going up 3680 */ 3681 static struct notifier_block ipv6_dev_notf = { 3682 .notifier_call = addrconf_notify, 3683 .priority = ADDRCONF_NOTIFY_PRIORITY, 3684 }; 3685 3686 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3687 { 3688 struct inet6_dev *idev; 3689 ASSERT_RTNL(); 3690 3691 idev = __in6_dev_get(dev); 3692 3693 if (event == NETDEV_POST_TYPE_CHANGE) 3694 ipv6_mc_remap(idev); 3695 else if (event == NETDEV_PRE_TYPE_CHANGE) 3696 ipv6_mc_unmap(idev); 3697 } 3698 3699 static bool addr_is_local(const struct in6_addr *addr) 3700 { 3701 return ipv6_addr_type(addr) & 3702 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3703 } 3704 3705 static int addrconf_ifdown(struct net_device *dev, bool unregister) 3706 { 3707 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN; 3708 struct net *net = dev_net(dev); 3709 struct inet6_dev *idev; 3710 struct inet6_ifaddr *ifa, *tmp; 3711 bool keep_addr = false; 3712 int state, i; 3713 3714 ASSERT_RTNL(); 3715 3716 rt6_disable_ip(dev, event); 3717 3718 idev = __in6_dev_get(dev); 3719 if (!idev) 3720 return -ENODEV; 3721 3722 /* 3723 * Step 1: remove reference to ipv6 device from parent device. 3724 * Do not dev_put! 3725 */ 3726 if (unregister) { 3727 idev->dead = 1; 3728 3729 /* protected by rtnl_lock */ 3730 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3731 3732 /* Step 1.5: remove snmp6 entry */ 3733 snmp6_unregister_dev(idev); 3734 3735 } 3736 3737 /* combine the user config with event to determine if permanent 3738 * addresses are to be removed from address hash table 3739 */ 3740 if (!unregister && !idev->cnf.disable_ipv6) { 3741 /* aggregate the system setting and interface setting */ 3742 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3743 3744 if (!_keep_addr) 3745 _keep_addr = idev->cnf.keep_addr_on_down; 3746 3747 keep_addr = (_keep_addr > 0); 3748 } 3749 3750 /* Step 2: clear hash table */ 3751 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3752 struct hlist_head *h = &inet6_addr_lst[i]; 3753 3754 spin_lock_bh(&addrconf_hash_lock); 3755 restart: 3756 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3757 if (ifa->idev == idev) { 3758 addrconf_del_dad_work(ifa); 3759 /* combined flag + permanent flag decide if 3760 * address is retained on a down event 3761 */ 3762 if (!keep_addr || 3763 !(ifa->flags & IFA_F_PERMANENT) || 3764 addr_is_local(&ifa->addr)) { 3765 hlist_del_init_rcu(&ifa->addr_lst); 3766 goto restart; 3767 } 3768 } 3769 } 3770 spin_unlock_bh(&addrconf_hash_lock); 3771 } 3772 3773 write_lock_bh(&idev->lock); 3774 3775 addrconf_del_rs_timer(idev); 3776 3777 /* Step 2: clear flags for stateless addrconf */ 3778 if (!unregister) 3779 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3780 3781 /* Step 3: clear tempaddr list */ 3782 while (!list_empty(&idev->tempaddr_list)) { 3783 ifa = list_first_entry(&idev->tempaddr_list, 3784 struct inet6_ifaddr, tmp_list); 3785 list_del(&ifa->tmp_list); 3786 write_unlock_bh(&idev->lock); 3787 spin_lock_bh(&ifa->lock); 3788 3789 if (ifa->ifpub) { 3790 in6_ifa_put(ifa->ifpub); 3791 ifa->ifpub = NULL; 3792 } 3793 spin_unlock_bh(&ifa->lock); 3794 in6_ifa_put(ifa); 3795 write_lock_bh(&idev->lock); 3796 } 3797 3798 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3799 struct fib6_info *rt = NULL; 3800 bool keep; 3801 3802 addrconf_del_dad_work(ifa); 3803 3804 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3805 !addr_is_local(&ifa->addr); 3806 3807 write_unlock_bh(&idev->lock); 3808 spin_lock_bh(&ifa->lock); 3809 3810 if (keep) { 3811 /* set state to skip the notifier below */ 3812 state = INET6_IFADDR_STATE_DEAD; 3813 ifa->state = INET6_IFADDR_STATE_PREDAD; 3814 if (!(ifa->flags & IFA_F_NODAD)) 3815 ifa->flags |= IFA_F_TENTATIVE; 3816 3817 rt = ifa->rt; 3818 ifa->rt = NULL; 3819 } else { 3820 state = ifa->state; 3821 ifa->state = INET6_IFADDR_STATE_DEAD; 3822 } 3823 3824 spin_unlock_bh(&ifa->lock); 3825 3826 if (rt) 3827 ip6_del_rt(net, rt, false); 3828 3829 if (state != INET6_IFADDR_STATE_DEAD) { 3830 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3831 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3832 } else { 3833 if (idev->cnf.forwarding) 3834 addrconf_leave_anycast(ifa); 3835 addrconf_leave_solict(ifa->idev, &ifa->addr); 3836 } 3837 3838 write_lock_bh(&idev->lock); 3839 if (!keep) { 3840 list_del_rcu(&ifa->if_list); 3841 in6_ifa_put(ifa); 3842 } 3843 } 3844 3845 write_unlock_bh(&idev->lock); 3846 3847 /* Step 5: Discard anycast and multicast list */ 3848 if (unregister) { 3849 ipv6_ac_destroy_dev(idev); 3850 ipv6_mc_destroy_dev(idev); 3851 } else { 3852 ipv6_mc_down(idev); 3853 } 3854 3855 idev->tstamp = jiffies; 3856 3857 /* Last: Shot the device (if unregistered) */ 3858 if (unregister) { 3859 addrconf_sysctl_unregister(idev); 3860 neigh_parms_release(&nd_tbl, idev->nd_parms); 3861 neigh_ifdown(&nd_tbl, dev); 3862 in6_dev_put(idev); 3863 } 3864 return 0; 3865 } 3866 3867 static void addrconf_rs_timer(struct timer_list *t) 3868 { 3869 struct inet6_dev *idev = from_timer(idev, t, rs_timer); 3870 struct net_device *dev = idev->dev; 3871 struct in6_addr lladdr; 3872 3873 write_lock(&idev->lock); 3874 if (idev->dead || !(idev->if_flags & IF_READY)) 3875 goto out; 3876 3877 if (!ipv6_accept_ra(idev)) 3878 goto out; 3879 3880 /* Announcement received after solicitation was sent */ 3881 if (idev->if_flags & IF_RA_RCVD) 3882 goto out; 3883 3884 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3885 write_unlock(&idev->lock); 3886 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3887 ndisc_send_rs(dev, &lladdr, 3888 &in6addr_linklocal_allrouters); 3889 else 3890 goto put; 3891 3892 write_lock(&idev->lock); 3893 idev->rs_interval = rfc3315_s14_backoff_update( 3894 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3895 /* The wait after the last probe can be shorter */ 3896 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3897 idev->cnf.rtr_solicits) ? 3898 idev->cnf.rtr_solicit_delay : 3899 idev->rs_interval); 3900 } else { 3901 /* 3902 * Note: we do not support deprecated "all on-link" 3903 * assumption any longer. 3904 */ 3905 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3906 } 3907 3908 out: 3909 write_unlock(&idev->lock); 3910 put: 3911 in6_dev_put(idev); 3912 } 3913 3914 /* 3915 * Duplicate Address Detection 3916 */ 3917 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3918 { 3919 unsigned long rand_num; 3920 struct inet6_dev *idev = ifp->idev; 3921 u64 nonce; 3922 3923 if (ifp->flags & IFA_F_OPTIMISTIC) 3924 rand_num = 0; 3925 else 3926 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3927 3928 nonce = 0; 3929 if (idev->cnf.enhanced_dad || 3930 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 3931 do 3932 get_random_bytes(&nonce, 6); 3933 while (nonce == 0); 3934 } 3935 ifp->dad_nonce = nonce; 3936 ifp->dad_probes = idev->cnf.dad_transmits; 3937 addrconf_mod_dad_work(ifp, rand_num); 3938 } 3939 3940 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3941 { 3942 struct inet6_dev *idev = ifp->idev; 3943 struct net_device *dev = idev->dev; 3944 bool bump_id, notify = false; 3945 struct net *net; 3946 3947 addrconf_join_solict(dev, &ifp->addr); 3948 3949 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3950 3951 read_lock_bh(&idev->lock); 3952 spin_lock(&ifp->lock); 3953 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3954 goto out; 3955 3956 net = dev_net(dev); 3957 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3958 (net->ipv6.devconf_all->accept_dad < 1 && 3959 idev->cnf.accept_dad < 1) || 3960 !(ifp->flags&IFA_F_TENTATIVE) || 3961 ifp->flags & IFA_F_NODAD) { 3962 bool send_na = false; 3963 3964 if (ifp->flags & IFA_F_TENTATIVE && 3965 !(ifp->flags & IFA_F_OPTIMISTIC)) 3966 send_na = true; 3967 bump_id = ifp->flags & IFA_F_TENTATIVE; 3968 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3969 spin_unlock(&ifp->lock); 3970 read_unlock_bh(&idev->lock); 3971 3972 addrconf_dad_completed(ifp, bump_id, send_na); 3973 return; 3974 } 3975 3976 if (!(idev->if_flags & IF_READY)) { 3977 spin_unlock(&ifp->lock); 3978 read_unlock_bh(&idev->lock); 3979 /* 3980 * If the device is not ready: 3981 * - keep it tentative if it is a permanent address. 3982 * - otherwise, kill it. 3983 */ 3984 in6_ifa_hold(ifp); 3985 addrconf_dad_stop(ifp, 0); 3986 return; 3987 } 3988 3989 /* 3990 * Optimistic nodes can start receiving 3991 * Frames right away 3992 */ 3993 if (ifp->flags & IFA_F_OPTIMISTIC) { 3994 ip6_ins_rt(net, ifp->rt); 3995 if (ipv6_use_optimistic_addr(net, idev)) { 3996 /* Because optimistic nodes can use this address, 3997 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3998 */ 3999 notify = true; 4000 } 4001 } 4002 4003 addrconf_dad_kick(ifp); 4004 out: 4005 spin_unlock(&ifp->lock); 4006 read_unlock_bh(&idev->lock); 4007 if (notify) 4008 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4009 } 4010 4011 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 4012 { 4013 bool begin_dad = false; 4014 4015 spin_lock_bh(&ifp->lock); 4016 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 4017 ifp->state = INET6_IFADDR_STATE_PREDAD; 4018 begin_dad = true; 4019 } 4020 spin_unlock_bh(&ifp->lock); 4021 4022 if (begin_dad) 4023 addrconf_mod_dad_work(ifp, 0); 4024 } 4025 4026 static void addrconf_dad_work(struct work_struct *w) 4027 { 4028 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 4029 struct inet6_ifaddr, 4030 dad_work); 4031 struct inet6_dev *idev = ifp->idev; 4032 bool bump_id, disable_ipv6 = false; 4033 struct in6_addr mcaddr; 4034 4035 enum { 4036 DAD_PROCESS, 4037 DAD_BEGIN, 4038 DAD_ABORT, 4039 } action = DAD_PROCESS; 4040 4041 rtnl_lock(); 4042 4043 spin_lock_bh(&ifp->lock); 4044 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 4045 action = DAD_BEGIN; 4046 ifp->state = INET6_IFADDR_STATE_DAD; 4047 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 4048 action = DAD_ABORT; 4049 ifp->state = INET6_IFADDR_STATE_POSTDAD; 4050 4051 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 || 4052 idev->cnf.accept_dad > 1) && 4053 !idev->cnf.disable_ipv6 && 4054 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 4055 struct in6_addr addr; 4056 4057 addr.s6_addr32[0] = htonl(0xfe800000); 4058 addr.s6_addr32[1] = 0; 4059 4060 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 4061 ipv6_addr_equal(&ifp->addr, &addr)) { 4062 /* DAD failed for link-local based on MAC */ 4063 idev->cnf.disable_ipv6 = 1; 4064 4065 pr_info("%s: IPv6 being disabled!\n", 4066 ifp->idev->dev->name); 4067 disable_ipv6 = true; 4068 } 4069 } 4070 } 4071 spin_unlock_bh(&ifp->lock); 4072 4073 if (action == DAD_BEGIN) { 4074 addrconf_dad_begin(ifp); 4075 goto out; 4076 } else if (action == DAD_ABORT) { 4077 in6_ifa_hold(ifp); 4078 addrconf_dad_stop(ifp, 1); 4079 if (disable_ipv6) 4080 addrconf_ifdown(idev->dev, false); 4081 goto out; 4082 } 4083 4084 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 4085 goto out; 4086 4087 write_lock_bh(&idev->lock); 4088 if (idev->dead || !(idev->if_flags & IF_READY)) { 4089 write_unlock_bh(&idev->lock); 4090 goto out; 4091 } 4092 4093 spin_lock(&ifp->lock); 4094 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 4095 spin_unlock(&ifp->lock); 4096 write_unlock_bh(&idev->lock); 4097 goto out; 4098 } 4099 4100 if (ifp->dad_probes == 0) { 4101 bool send_na = false; 4102 4103 /* 4104 * DAD was successful 4105 */ 4106 4107 if (ifp->flags & IFA_F_TENTATIVE && 4108 !(ifp->flags & IFA_F_OPTIMISTIC)) 4109 send_na = true; 4110 bump_id = ifp->flags & IFA_F_TENTATIVE; 4111 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4112 spin_unlock(&ifp->lock); 4113 write_unlock_bh(&idev->lock); 4114 4115 addrconf_dad_completed(ifp, bump_id, send_na); 4116 4117 goto out; 4118 } 4119 4120 ifp->dad_probes--; 4121 addrconf_mod_dad_work(ifp, 4122 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), 4123 HZ/100)); 4124 spin_unlock(&ifp->lock); 4125 write_unlock_bh(&idev->lock); 4126 4127 /* send a neighbour solicitation for our addr */ 4128 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 4129 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 4130 ifp->dad_nonce); 4131 out: 4132 in6_ifa_put(ifp); 4133 rtnl_unlock(); 4134 } 4135 4136 /* ifp->idev must be at least read locked */ 4137 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4138 { 4139 struct inet6_ifaddr *ifpiter; 4140 struct inet6_dev *idev = ifp->idev; 4141 4142 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4143 if (ifpiter->scope > IFA_LINK) 4144 break; 4145 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4146 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4147 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4148 IFA_F_PERMANENT) 4149 return false; 4150 } 4151 return true; 4152 } 4153 4154 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 4155 bool send_na) 4156 { 4157 struct net_device *dev = ifp->idev->dev; 4158 struct in6_addr lladdr; 4159 bool send_rs, send_mld; 4160 4161 addrconf_del_dad_work(ifp); 4162 4163 /* 4164 * Configure the address for reception. Now it is valid. 4165 */ 4166 4167 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4168 4169 /* If added prefix is link local and we are prepared to process 4170 router advertisements, start sending router solicitations. 4171 */ 4172 4173 read_lock_bh(&ifp->idev->lock); 4174 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4175 send_rs = send_mld && 4176 ipv6_accept_ra(ifp->idev) && 4177 ifp->idev->cnf.rtr_solicits != 0 && 4178 (dev->flags&IFF_LOOPBACK) == 0; 4179 read_unlock_bh(&ifp->idev->lock); 4180 4181 /* While dad is in progress mld report's source address is in6_addrany. 4182 * Resend with proper ll now. 4183 */ 4184 if (send_mld) 4185 ipv6_mc_dad_complete(ifp->idev); 4186 4187 /* send unsolicited NA if enabled */ 4188 if (send_na && 4189 (ifp->idev->cnf.ndisc_notify || 4190 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) { 4191 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr, 4192 /*router=*/ !!ifp->idev->cnf.forwarding, 4193 /*solicited=*/ false, /*override=*/ true, 4194 /*inc_opt=*/ true); 4195 } 4196 4197 if (send_rs) { 4198 /* 4199 * If a host as already performed a random delay 4200 * [...] as part of DAD [...] there is no need 4201 * to delay again before sending the first RS 4202 */ 4203 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4204 return; 4205 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4206 4207 write_lock_bh(&ifp->idev->lock); 4208 spin_lock(&ifp->lock); 4209 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4210 ifp->idev->cnf.rtr_solicit_interval); 4211 ifp->idev->rs_probes = 1; 4212 ifp->idev->if_flags |= IF_RS_SENT; 4213 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4214 spin_unlock(&ifp->lock); 4215 write_unlock_bh(&ifp->idev->lock); 4216 } 4217 4218 if (bump_id) 4219 rt_genid_bump_ipv6(dev_net(dev)); 4220 4221 /* Make sure that a new temporary address will be created 4222 * before this temporary address becomes deprecated. 4223 */ 4224 if (ifp->flags & IFA_F_TEMPORARY) 4225 addrconf_verify_rtnl(); 4226 } 4227 4228 static void addrconf_dad_run(struct inet6_dev *idev, bool restart) 4229 { 4230 struct inet6_ifaddr *ifp; 4231 4232 read_lock_bh(&idev->lock); 4233 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4234 spin_lock(&ifp->lock); 4235 if ((ifp->flags & IFA_F_TENTATIVE && 4236 ifp->state == INET6_IFADDR_STATE_DAD) || restart) { 4237 if (restart) 4238 ifp->state = INET6_IFADDR_STATE_PREDAD; 4239 addrconf_dad_kick(ifp); 4240 } 4241 spin_unlock(&ifp->lock); 4242 } 4243 read_unlock_bh(&idev->lock); 4244 } 4245 4246 #ifdef CONFIG_PROC_FS 4247 struct if6_iter_state { 4248 struct seq_net_private p; 4249 int bucket; 4250 int offset; 4251 }; 4252 4253 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4254 { 4255 struct if6_iter_state *state = seq->private; 4256 struct net *net = seq_file_net(seq); 4257 struct inet6_ifaddr *ifa = NULL; 4258 int p = 0; 4259 4260 /* initial bucket if pos is 0 */ 4261 if (pos == 0) { 4262 state->bucket = 0; 4263 state->offset = 0; 4264 } 4265 4266 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4267 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket], 4268 addr_lst) { 4269 if (!net_eq(dev_net(ifa->idev->dev), net)) 4270 continue; 4271 /* sync with offset */ 4272 if (p < state->offset) { 4273 p++; 4274 continue; 4275 } 4276 return ifa; 4277 } 4278 4279 /* prepare for next bucket */ 4280 state->offset = 0; 4281 p = 0; 4282 } 4283 return NULL; 4284 } 4285 4286 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4287 struct inet6_ifaddr *ifa) 4288 { 4289 struct if6_iter_state *state = seq->private; 4290 struct net *net = seq_file_net(seq); 4291 4292 hlist_for_each_entry_continue_rcu(ifa, addr_lst) { 4293 if (!net_eq(dev_net(ifa->idev->dev), net)) 4294 continue; 4295 state->offset++; 4296 return ifa; 4297 } 4298 4299 state->offset = 0; 4300 while (++state->bucket < IN6_ADDR_HSIZE) { 4301 hlist_for_each_entry_rcu(ifa, 4302 &inet6_addr_lst[state->bucket], addr_lst) { 4303 if (!net_eq(dev_net(ifa->idev->dev), net)) 4304 continue; 4305 return ifa; 4306 } 4307 } 4308 4309 return NULL; 4310 } 4311 4312 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4313 __acquires(rcu) 4314 { 4315 rcu_read_lock(); 4316 return if6_get_first(seq, *pos); 4317 } 4318 4319 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4320 { 4321 struct inet6_ifaddr *ifa; 4322 4323 ifa = if6_get_next(seq, v); 4324 ++*pos; 4325 return ifa; 4326 } 4327 4328 static void if6_seq_stop(struct seq_file *seq, void *v) 4329 __releases(rcu) 4330 { 4331 rcu_read_unlock(); 4332 } 4333 4334 static int if6_seq_show(struct seq_file *seq, void *v) 4335 { 4336 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4337 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4338 &ifp->addr, 4339 ifp->idev->dev->ifindex, 4340 ifp->prefix_len, 4341 ifp->scope, 4342 (u8) ifp->flags, 4343 ifp->idev->dev->name); 4344 return 0; 4345 } 4346 4347 static const struct seq_operations if6_seq_ops = { 4348 .start = if6_seq_start, 4349 .next = if6_seq_next, 4350 .show = if6_seq_show, 4351 .stop = if6_seq_stop, 4352 }; 4353 4354 static int __net_init if6_proc_net_init(struct net *net) 4355 { 4356 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops, 4357 sizeof(struct if6_iter_state))) 4358 return -ENOMEM; 4359 return 0; 4360 } 4361 4362 static void __net_exit if6_proc_net_exit(struct net *net) 4363 { 4364 remove_proc_entry("if_inet6", net->proc_net); 4365 } 4366 4367 static struct pernet_operations if6_proc_net_ops = { 4368 .init = if6_proc_net_init, 4369 .exit = if6_proc_net_exit, 4370 }; 4371 4372 int __init if6_proc_init(void) 4373 { 4374 return register_pernet_subsys(&if6_proc_net_ops); 4375 } 4376 4377 void if6_proc_exit(void) 4378 { 4379 unregister_pernet_subsys(&if6_proc_net_ops); 4380 } 4381 #endif /* CONFIG_PROC_FS */ 4382 4383 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4384 /* Check if address is a home address configured on any interface. */ 4385 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4386 { 4387 unsigned int hash = inet6_addr_hash(net, addr); 4388 struct inet6_ifaddr *ifp = NULL; 4389 int ret = 0; 4390 4391 rcu_read_lock(); 4392 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 4393 if (!net_eq(dev_net(ifp->idev->dev), net)) 4394 continue; 4395 if (ipv6_addr_equal(&ifp->addr, addr) && 4396 (ifp->flags & IFA_F_HOMEADDRESS)) { 4397 ret = 1; 4398 break; 4399 } 4400 } 4401 rcu_read_unlock(); 4402 return ret; 4403 } 4404 #endif 4405 4406 /* RFC6554 has some algorithm to avoid loops in segment routing by 4407 * checking if the segments contains any of a local interface address. 4408 * 4409 * Quote: 4410 * 4411 * To detect loops in the SRH, a router MUST determine if the SRH 4412 * includes multiple addresses assigned to any interface on that router. 4413 * If such addresses appear more than once and are separated by at least 4414 * one address not assigned to that router. 4415 */ 4416 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs, 4417 unsigned char nsegs) 4418 { 4419 const struct in6_addr *addr; 4420 int i, ret = 0, found = 0; 4421 struct inet6_ifaddr *ifp; 4422 bool separated = false; 4423 unsigned int hash; 4424 bool hash_found; 4425 4426 rcu_read_lock(); 4427 for (i = 0; i < nsegs; i++) { 4428 addr = &segs[i]; 4429 hash = inet6_addr_hash(net, addr); 4430 4431 hash_found = false; 4432 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 4433 if (!net_eq(dev_net(ifp->idev->dev), net)) 4434 continue; 4435 4436 if (ipv6_addr_equal(&ifp->addr, addr)) { 4437 hash_found = true; 4438 break; 4439 } 4440 } 4441 4442 if (hash_found) { 4443 if (found > 1 && separated) { 4444 ret = 1; 4445 break; 4446 } 4447 4448 separated = false; 4449 found++; 4450 } else { 4451 separated = true; 4452 } 4453 } 4454 rcu_read_unlock(); 4455 4456 return ret; 4457 } 4458 4459 /* 4460 * Periodic address status verification 4461 */ 4462 4463 static void addrconf_verify_rtnl(void) 4464 { 4465 unsigned long now, next, next_sec, next_sched; 4466 struct inet6_ifaddr *ifp; 4467 int i; 4468 4469 ASSERT_RTNL(); 4470 4471 rcu_read_lock_bh(); 4472 now = jiffies; 4473 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4474 4475 cancel_delayed_work(&addr_chk_work); 4476 4477 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4478 restart: 4479 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4480 unsigned long age; 4481 4482 /* When setting preferred_lft to a value not zero or 4483 * infinity, while valid_lft is infinity 4484 * IFA_F_PERMANENT has a non-infinity life time. 4485 */ 4486 if ((ifp->flags & IFA_F_PERMANENT) && 4487 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4488 continue; 4489 4490 spin_lock(&ifp->lock); 4491 /* We try to batch several events at once. */ 4492 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4493 4494 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4495 age >= ifp->valid_lft) { 4496 spin_unlock(&ifp->lock); 4497 in6_ifa_hold(ifp); 4498 ipv6_del_addr(ifp); 4499 goto restart; 4500 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4501 spin_unlock(&ifp->lock); 4502 continue; 4503 } else if (age >= ifp->prefered_lft) { 4504 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4505 int deprecate = 0; 4506 4507 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4508 deprecate = 1; 4509 ifp->flags |= IFA_F_DEPRECATED; 4510 } 4511 4512 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4513 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4514 next = ifp->tstamp + ifp->valid_lft * HZ; 4515 4516 spin_unlock(&ifp->lock); 4517 4518 if (deprecate) { 4519 in6_ifa_hold(ifp); 4520 4521 ipv6_ifa_notify(0, ifp); 4522 in6_ifa_put(ifp); 4523 goto restart; 4524 } 4525 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4526 !(ifp->flags&IFA_F_TENTATIVE)) { 4527 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4528 ifp->idev->cnf.dad_transmits * 4529 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 4530 4531 if (age >= ifp->prefered_lft - regen_advance) { 4532 struct inet6_ifaddr *ifpub = ifp->ifpub; 4533 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4534 next = ifp->tstamp + ifp->prefered_lft * HZ; 4535 if (!ifp->regen_count && ifpub) { 4536 ifp->regen_count++; 4537 in6_ifa_hold(ifp); 4538 in6_ifa_hold(ifpub); 4539 spin_unlock(&ifp->lock); 4540 4541 spin_lock(&ifpub->lock); 4542 ifpub->regen_count = 0; 4543 spin_unlock(&ifpub->lock); 4544 rcu_read_unlock_bh(); 4545 ipv6_create_tempaddr(ifpub, true); 4546 in6_ifa_put(ifpub); 4547 in6_ifa_put(ifp); 4548 rcu_read_lock_bh(); 4549 goto restart; 4550 } 4551 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4552 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4553 spin_unlock(&ifp->lock); 4554 } else { 4555 /* ifp->prefered_lft <= ifp->valid_lft */ 4556 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4557 next = ifp->tstamp + ifp->prefered_lft * HZ; 4558 spin_unlock(&ifp->lock); 4559 } 4560 } 4561 } 4562 4563 next_sec = round_jiffies_up(next); 4564 next_sched = next; 4565 4566 /* If rounded timeout is accurate enough, accept it. */ 4567 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4568 next_sched = next_sec; 4569 4570 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4571 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4572 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4573 4574 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4575 now, next, next_sec, next_sched); 4576 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4577 rcu_read_unlock_bh(); 4578 } 4579 4580 static void addrconf_verify_work(struct work_struct *w) 4581 { 4582 rtnl_lock(); 4583 addrconf_verify_rtnl(); 4584 rtnl_unlock(); 4585 } 4586 4587 static void addrconf_verify(void) 4588 { 4589 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4590 } 4591 4592 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4593 struct in6_addr **peer_pfx) 4594 { 4595 struct in6_addr *pfx = NULL; 4596 4597 *peer_pfx = NULL; 4598 4599 if (addr) 4600 pfx = nla_data(addr); 4601 4602 if (local) { 4603 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4604 *peer_pfx = pfx; 4605 pfx = nla_data(local); 4606 } 4607 4608 return pfx; 4609 } 4610 4611 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4612 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4613 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4614 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4615 [IFA_FLAGS] = { .len = sizeof(u32) }, 4616 [IFA_RT_PRIORITY] = { .len = sizeof(u32) }, 4617 [IFA_TARGET_NETNSID] = { .type = NLA_S32 }, 4618 }; 4619 4620 static int 4621 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4622 struct netlink_ext_ack *extack) 4623 { 4624 struct net *net = sock_net(skb->sk); 4625 struct ifaddrmsg *ifm; 4626 struct nlattr *tb[IFA_MAX+1]; 4627 struct in6_addr *pfx, *peer_pfx; 4628 u32 ifa_flags; 4629 int err; 4630 4631 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4632 ifa_ipv6_policy, extack); 4633 if (err < 0) 4634 return err; 4635 4636 ifm = nlmsg_data(nlh); 4637 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4638 if (!pfx) 4639 return -EINVAL; 4640 4641 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4642 4643 /* We ignore other flags so far. */ 4644 ifa_flags &= IFA_F_MANAGETEMPADDR; 4645 4646 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4647 ifm->ifa_prefixlen); 4648 } 4649 4650 static int modify_prefix_route(struct inet6_ifaddr *ifp, 4651 unsigned long expires, u32 flags, 4652 bool modify_peer) 4653 { 4654 struct fib6_info *f6i; 4655 u32 prio; 4656 4657 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4658 ifp->prefix_len, 4659 ifp->idev->dev, 0, RTF_DEFAULT, true); 4660 if (!f6i) 4661 return -ENOENT; 4662 4663 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF; 4664 if (f6i->fib6_metric != prio) { 4665 /* delete old one */ 4666 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 4667 4668 /* add new one */ 4669 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4670 ifp->prefix_len, 4671 ifp->rt_priority, ifp->idev->dev, 4672 expires, flags, GFP_KERNEL); 4673 } else { 4674 if (!expires) 4675 fib6_clean_expires(f6i); 4676 else 4677 fib6_set_expires(f6i, expires); 4678 4679 fib6_info_release(f6i); 4680 } 4681 4682 return 0; 4683 } 4684 4685 static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg) 4686 { 4687 u32 flags; 4688 clock_t expires; 4689 unsigned long timeout; 4690 bool was_managetempaddr; 4691 bool had_prefixroute; 4692 bool new_peer = false; 4693 4694 ASSERT_RTNL(); 4695 4696 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 4697 return -EINVAL; 4698 4699 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && 4700 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4701 return -EINVAL; 4702 4703 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED) 4704 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC; 4705 4706 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 4707 if (addrconf_finite_timeout(timeout)) { 4708 expires = jiffies_to_clock_t(timeout * HZ); 4709 cfg->valid_lft = timeout; 4710 flags = RTF_EXPIRES; 4711 } else { 4712 expires = 0; 4713 flags = 0; 4714 cfg->ifa_flags |= IFA_F_PERMANENT; 4715 } 4716 4717 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 4718 if (addrconf_finite_timeout(timeout)) { 4719 if (timeout == 0) 4720 cfg->ifa_flags |= IFA_F_DEPRECATED; 4721 cfg->preferred_lft = timeout; 4722 } 4723 4724 if (cfg->peer_pfx && 4725 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) { 4726 if (!ipv6_addr_any(&ifp->peer_addr)) 4727 cleanup_prefix_route(ifp, expires, true, true); 4728 new_peer = true; 4729 } 4730 4731 spin_lock_bh(&ifp->lock); 4732 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4733 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4734 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4735 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4736 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4737 IFA_F_NOPREFIXROUTE); 4738 ifp->flags |= cfg->ifa_flags; 4739 ifp->tstamp = jiffies; 4740 ifp->valid_lft = cfg->valid_lft; 4741 ifp->prefered_lft = cfg->preferred_lft; 4742 4743 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority) 4744 ifp->rt_priority = cfg->rt_priority; 4745 4746 if (new_peer) 4747 ifp->peer_addr = *cfg->peer_pfx; 4748 4749 spin_unlock_bh(&ifp->lock); 4750 if (!(ifp->flags&IFA_F_TENTATIVE)) 4751 ipv6_ifa_notify(0, ifp); 4752 4753 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 4754 int rc = -ENOENT; 4755 4756 if (had_prefixroute) 4757 rc = modify_prefix_route(ifp, expires, flags, false); 4758 4759 /* prefix route could have been deleted; if so restore it */ 4760 if (rc == -ENOENT) { 4761 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4762 ifp->rt_priority, ifp->idev->dev, 4763 expires, flags, GFP_KERNEL); 4764 } 4765 4766 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr)) 4767 rc = modify_prefix_route(ifp, expires, flags, true); 4768 4769 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) { 4770 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len, 4771 ifp->rt_priority, ifp->idev->dev, 4772 expires, flags, GFP_KERNEL); 4773 } 4774 } else if (had_prefixroute) { 4775 enum cleanup_prefix_rt_t action; 4776 unsigned long rt_expires; 4777 4778 write_lock_bh(&ifp->idev->lock); 4779 action = check_cleanup_prefix_route(ifp, &rt_expires); 4780 write_unlock_bh(&ifp->idev->lock); 4781 4782 if (action != CLEANUP_PREFIX_RT_NOP) { 4783 cleanup_prefix_route(ifp, rt_expires, 4784 action == CLEANUP_PREFIX_RT_DEL, false); 4785 } 4786 } 4787 4788 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4789 if (was_managetempaddr && 4790 !(ifp->flags & IFA_F_MANAGETEMPADDR)) { 4791 cfg->valid_lft = 0; 4792 cfg->preferred_lft = 0; 4793 } 4794 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft, 4795 cfg->preferred_lft, !was_managetempaddr, 4796 jiffies); 4797 } 4798 4799 addrconf_verify_rtnl(); 4800 4801 return 0; 4802 } 4803 4804 static int 4805 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4806 struct netlink_ext_ack *extack) 4807 { 4808 struct net *net = sock_net(skb->sk); 4809 struct ifaddrmsg *ifm; 4810 struct nlattr *tb[IFA_MAX+1]; 4811 struct in6_addr *peer_pfx; 4812 struct inet6_ifaddr *ifa; 4813 struct net_device *dev; 4814 struct inet6_dev *idev; 4815 struct ifa6_config cfg; 4816 int err; 4817 4818 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4819 ifa_ipv6_policy, extack); 4820 if (err < 0) 4821 return err; 4822 4823 memset(&cfg, 0, sizeof(cfg)); 4824 4825 ifm = nlmsg_data(nlh); 4826 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4827 if (!cfg.pfx) 4828 return -EINVAL; 4829 4830 cfg.peer_pfx = peer_pfx; 4831 cfg.plen = ifm->ifa_prefixlen; 4832 if (tb[IFA_RT_PRIORITY]) 4833 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]); 4834 4835 cfg.valid_lft = INFINITY_LIFE_TIME; 4836 cfg.preferred_lft = INFINITY_LIFE_TIME; 4837 4838 if (tb[IFA_CACHEINFO]) { 4839 struct ifa_cacheinfo *ci; 4840 4841 ci = nla_data(tb[IFA_CACHEINFO]); 4842 cfg.valid_lft = ci->ifa_valid; 4843 cfg.preferred_lft = ci->ifa_prefered; 4844 } 4845 4846 dev = __dev_get_by_index(net, ifm->ifa_index); 4847 if (!dev) 4848 return -ENODEV; 4849 4850 if (tb[IFA_FLAGS]) 4851 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]); 4852 else 4853 cfg.ifa_flags = ifm->ifa_flags; 4854 4855 /* We ignore other flags so far. */ 4856 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | 4857 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE | 4858 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC; 4859 4860 idev = ipv6_find_idev(dev); 4861 if (IS_ERR(idev)) 4862 return PTR_ERR(idev); 4863 4864 if (!ipv6_allow_optimistic_dad(net, idev)) 4865 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC; 4866 4867 if (cfg.ifa_flags & IFA_F_NODAD && 4868 cfg.ifa_flags & IFA_F_OPTIMISTIC) { 4869 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive"); 4870 return -EINVAL; 4871 } 4872 4873 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1); 4874 if (!ifa) { 4875 /* 4876 * It would be best to check for !NLM_F_CREATE here but 4877 * userspace already relies on not having to provide this. 4878 */ 4879 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack); 4880 } 4881 4882 if (nlh->nlmsg_flags & NLM_F_EXCL || 4883 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4884 err = -EEXIST; 4885 else 4886 err = inet6_addr_modify(ifa, &cfg); 4887 4888 in6_ifa_put(ifa); 4889 4890 return err; 4891 } 4892 4893 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4894 u8 scope, int ifindex) 4895 { 4896 struct ifaddrmsg *ifm; 4897 4898 ifm = nlmsg_data(nlh); 4899 ifm->ifa_family = AF_INET6; 4900 ifm->ifa_prefixlen = prefixlen; 4901 ifm->ifa_flags = flags; 4902 ifm->ifa_scope = scope; 4903 ifm->ifa_index = ifindex; 4904 } 4905 4906 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4907 unsigned long tstamp, u32 preferred, u32 valid) 4908 { 4909 struct ifa_cacheinfo ci; 4910 4911 ci.cstamp = cstamp_delta(cstamp); 4912 ci.tstamp = cstamp_delta(tstamp); 4913 ci.ifa_prefered = preferred; 4914 ci.ifa_valid = valid; 4915 4916 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4917 } 4918 4919 static inline int rt_scope(int ifa_scope) 4920 { 4921 if (ifa_scope & IFA_HOST) 4922 return RT_SCOPE_HOST; 4923 else if (ifa_scope & IFA_LINK) 4924 return RT_SCOPE_LINK; 4925 else if (ifa_scope & IFA_SITE) 4926 return RT_SCOPE_SITE; 4927 else 4928 return RT_SCOPE_UNIVERSE; 4929 } 4930 4931 static inline int inet6_ifaddr_msgsize(void) 4932 { 4933 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4934 + nla_total_size(16) /* IFA_LOCAL */ 4935 + nla_total_size(16) /* IFA_ADDRESS */ 4936 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4937 + nla_total_size(4) /* IFA_FLAGS */ 4938 + nla_total_size(4) /* IFA_RT_PRIORITY */; 4939 } 4940 4941 enum addr_type_t { 4942 UNICAST_ADDR, 4943 MULTICAST_ADDR, 4944 ANYCAST_ADDR, 4945 }; 4946 4947 struct inet6_fill_args { 4948 u32 portid; 4949 u32 seq; 4950 int event; 4951 unsigned int flags; 4952 int netnsid; 4953 int ifindex; 4954 enum addr_type_t type; 4955 }; 4956 4957 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4958 struct inet6_fill_args *args) 4959 { 4960 struct nlmsghdr *nlh; 4961 u32 preferred, valid; 4962 4963 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 4964 sizeof(struct ifaddrmsg), args->flags); 4965 if (!nlh) 4966 return -EMSGSIZE; 4967 4968 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4969 ifa->idev->dev->ifindex); 4970 4971 if (args->netnsid >= 0 && 4972 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 4973 goto error; 4974 4975 if (!((ifa->flags&IFA_F_PERMANENT) && 4976 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4977 preferred = ifa->prefered_lft; 4978 valid = ifa->valid_lft; 4979 if (preferred != INFINITY_LIFE_TIME) { 4980 long tval = (jiffies - ifa->tstamp)/HZ; 4981 if (preferred > tval) 4982 preferred -= tval; 4983 else 4984 preferred = 0; 4985 if (valid != INFINITY_LIFE_TIME) { 4986 if (valid > tval) 4987 valid -= tval; 4988 else 4989 valid = 0; 4990 } 4991 } 4992 } else { 4993 preferred = INFINITY_LIFE_TIME; 4994 valid = INFINITY_LIFE_TIME; 4995 } 4996 4997 if (!ipv6_addr_any(&ifa->peer_addr)) { 4998 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4999 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 5000 goto error; 5001 } else 5002 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 5003 goto error; 5004 5005 if (ifa->rt_priority && 5006 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority)) 5007 goto error; 5008 5009 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 5010 goto error; 5011 5012 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 5013 goto error; 5014 5015 nlmsg_end(skb, nlh); 5016 return 0; 5017 5018 error: 5019 nlmsg_cancel(skb, nlh); 5020 return -EMSGSIZE; 5021 } 5022 5023 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 5024 struct inet6_fill_args *args) 5025 { 5026 struct nlmsghdr *nlh; 5027 u8 scope = RT_SCOPE_UNIVERSE; 5028 int ifindex = ifmca->idev->dev->ifindex; 5029 5030 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 5031 scope = RT_SCOPE_SITE; 5032 5033 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5034 sizeof(struct ifaddrmsg), args->flags); 5035 if (!nlh) 5036 return -EMSGSIZE; 5037 5038 if (args->netnsid >= 0 && 5039 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 5040 return -EMSGSIZE; 5041 5042 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5043 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 5044 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 5045 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5046 nlmsg_cancel(skb, nlh); 5047 return -EMSGSIZE; 5048 } 5049 5050 nlmsg_end(skb, nlh); 5051 return 0; 5052 } 5053 5054 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 5055 struct inet6_fill_args *args) 5056 { 5057 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt); 5058 int ifindex = dev ? dev->ifindex : 1; 5059 struct nlmsghdr *nlh; 5060 u8 scope = RT_SCOPE_UNIVERSE; 5061 5062 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 5063 scope = RT_SCOPE_SITE; 5064 5065 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5066 sizeof(struct ifaddrmsg), args->flags); 5067 if (!nlh) 5068 return -EMSGSIZE; 5069 5070 if (args->netnsid >= 0 && 5071 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 5072 return -EMSGSIZE; 5073 5074 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5075 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 5076 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 5077 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5078 nlmsg_cancel(skb, nlh); 5079 return -EMSGSIZE; 5080 } 5081 5082 nlmsg_end(skb, nlh); 5083 return 0; 5084 } 5085 5086 /* called with rcu_read_lock() */ 5087 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 5088 struct netlink_callback *cb, int s_ip_idx, 5089 struct inet6_fill_args *fillargs) 5090 { 5091 struct ifmcaddr6 *ifmca; 5092 struct ifacaddr6 *ifaca; 5093 int ip_idx = 0; 5094 int err = 1; 5095 5096 read_lock_bh(&idev->lock); 5097 switch (fillargs->type) { 5098 case UNICAST_ADDR: { 5099 struct inet6_ifaddr *ifa; 5100 fillargs->event = RTM_NEWADDR; 5101 5102 /* unicast address incl. temp addr */ 5103 list_for_each_entry(ifa, &idev->addr_list, if_list) { 5104 if (ip_idx < s_ip_idx) 5105 goto next; 5106 err = inet6_fill_ifaddr(skb, ifa, fillargs); 5107 if (err < 0) 5108 break; 5109 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 5110 next: 5111 ip_idx++; 5112 } 5113 break; 5114 } 5115 case MULTICAST_ADDR: 5116 fillargs->event = RTM_GETMULTICAST; 5117 5118 /* multicast address */ 5119 for (ifmca = idev->mc_list; ifmca; 5120 ifmca = ifmca->next, ip_idx++) { 5121 if (ip_idx < s_ip_idx) 5122 continue; 5123 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs); 5124 if (err < 0) 5125 break; 5126 } 5127 break; 5128 case ANYCAST_ADDR: 5129 fillargs->event = RTM_GETANYCAST; 5130 /* anycast address */ 5131 for (ifaca = idev->ac_list; ifaca; 5132 ifaca = ifaca->aca_next, ip_idx++) { 5133 if (ip_idx < s_ip_idx) 5134 continue; 5135 err = inet6_fill_ifacaddr(skb, ifaca, fillargs); 5136 if (err < 0) 5137 break; 5138 } 5139 break; 5140 default: 5141 break; 5142 } 5143 read_unlock_bh(&idev->lock); 5144 cb->args[2] = ip_idx; 5145 return err; 5146 } 5147 5148 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh, 5149 struct inet6_fill_args *fillargs, 5150 struct net **tgt_net, struct sock *sk, 5151 struct netlink_callback *cb) 5152 { 5153 struct netlink_ext_ack *extack = cb->extack; 5154 struct nlattr *tb[IFA_MAX+1]; 5155 struct ifaddrmsg *ifm; 5156 int err, i; 5157 5158 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5159 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request"); 5160 return -EINVAL; 5161 } 5162 5163 ifm = nlmsg_data(nlh); 5164 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5165 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request"); 5166 return -EINVAL; 5167 } 5168 5169 fillargs->ifindex = ifm->ifa_index; 5170 if (fillargs->ifindex) { 5171 cb->answer_flags |= NLM_F_DUMP_FILTERED; 5172 fillargs->flags |= NLM_F_DUMP_FILTERED; 5173 } 5174 5175 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5176 ifa_ipv6_policy, extack); 5177 if (err < 0) 5178 return err; 5179 5180 for (i = 0; i <= IFA_MAX; ++i) { 5181 if (!tb[i]) 5182 continue; 5183 5184 if (i == IFA_TARGET_NETNSID) { 5185 struct net *net; 5186 5187 fillargs->netnsid = nla_get_s32(tb[i]); 5188 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid); 5189 if (IS_ERR(net)) { 5190 fillargs->netnsid = -1; 5191 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id"); 5192 return PTR_ERR(net); 5193 } 5194 *tgt_net = net; 5195 } else { 5196 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); 5197 return -EINVAL; 5198 } 5199 } 5200 5201 return 0; 5202 } 5203 5204 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 5205 enum addr_type_t type) 5206 { 5207 const struct nlmsghdr *nlh = cb->nlh; 5208 struct inet6_fill_args fillargs = { 5209 .portid = NETLINK_CB(cb->skb).portid, 5210 .seq = cb->nlh->nlmsg_seq, 5211 .flags = NLM_F_MULTI, 5212 .netnsid = -1, 5213 .type = type, 5214 }; 5215 struct net *net = sock_net(skb->sk); 5216 struct net *tgt_net = net; 5217 int idx, s_idx, s_ip_idx; 5218 int h, s_h; 5219 struct net_device *dev; 5220 struct inet6_dev *idev; 5221 struct hlist_head *head; 5222 int err = 0; 5223 5224 s_h = cb->args[0]; 5225 s_idx = idx = cb->args[1]; 5226 s_ip_idx = cb->args[2]; 5227 5228 if (cb->strict_check) { 5229 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net, 5230 skb->sk, cb); 5231 if (err < 0) 5232 goto put_tgt_net; 5233 5234 err = 0; 5235 if (fillargs.ifindex) { 5236 dev = __dev_get_by_index(tgt_net, fillargs.ifindex); 5237 if (!dev) { 5238 err = -ENODEV; 5239 goto put_tgt_net; 5240 } 5241 idev = __in6_dev_get(dev); 5242 if (idev) { 5243 err = in6_dump_addrs(idev, skb, cb, s_ip_idx, 5244 &fillargs); 5245 if (err > 0) 5246 err = 0; 5247 } 5248 goto put_tgt_net; 5249 } 5250 } 5251 5252 rcu_read_lock(); 5253 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq; 5254 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5255 idx = 0; 5256 head = &tgt_net->dev_index_head[h]; 5257 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5258 if (idx < s_idx) 5259 goto cont; 5260 if (h > s_h || idx > s_idx) 5261 s_ip_idx = 0; 5262 idev = __in6_dev_get(dev); 5263 if (!idev) 5264 goto cont; 5265 5266 if (in6_dump_addrs(idev, skb, cb, s_ip_idx, 5267 &fillargs) < 0) 5268 goto done; 5269 cont: 5270 idx++; 5271 } 5272 } 5273 done: 5274 rcu_read_unlock(); 5275 cb->args[0] = h; 5276 cb->args[1] = idx; 5277 put_tgt_net: 5278 if (fillargs.netnsid >= 0) 5279 put_net(tgt_net); 5280 5281 return skb->len ? : err; 5282 } 5283 5284 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 5285 { 5286 enum addr_type_t type = UNICAST_ADDR; 5287 5288 return inet6_dump_addr(skb, cb, type); 5289 } 5290 5291 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 5292 { 5293 enum addr_type_t type = MULTICAST_ADDR; 5294 5295 return inet6_dump_addr(skb, cb, type); 5296 } 5297 5298 5299 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 5300 { 5301 enum addr_type_t type = ANYCAST_ADDR; 5302 5303 return inet6_dump_addr(skb, cb, type); 5304 } 5305 5306 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb, 5307 const struct nlmsghdr *nlh, 5308 struct nlattr **tb, 5309 struct netlink_ext_ack *extack) 5310 { 5311 struct ifaddrmsg *ifm; 5312 int i, err; 5313 5314 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5315 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request"); 5316 return -EINVAL; 5317 } 5318 5319 if (!netlink_strict_get_check(skb)) 5320 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 5321 ifa_ipv6_policy, extack); 5322 5323 ifm = nlmsg_data(nlh); 5324 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5325 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request"); 5326 return -EINVAL; 5327 } 5328 5329 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5330 ifa_ipv6_policy, extack); 5331 if (err) 5332 return err; 5333 5334 for (i = 0; i <= IFA_MAX; i++) { 5335 if (!tb[i]) 5336 continue; 5337 5338 switch (i) { 5339 case IFA_TARGET_NETNSID: 5340 case IFA_ADDRESS: 5341 case IFA_LOCAL: 5342 break; 5343 default: 5344 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request"); 5345 return -EINVAL; 5346 } 5347 } 5348 5349 return 0; 5350 } 5351 5352 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 5353 struct netlink_ext_ack *extack) 5354 { 5355 struct net *net = sock_net(in_skb->sk); 5356 struct inet6_fill_args fillargs = { 5357 .portid = NETLINK_CB(in_skb).portid, 5358 .seq = nlh->nlmsg_seq, 5359 .event = RTM_NEWADDR, 5360 .flags = 0, 5361 .netnsid = -1, 5362 }; 5363 struct net *tgt_net = net; 5364 struct ifaddrmsg *ifm; 5365 struct nlattr *tb[IFA_MAX+1]; 5366 struct in6_addr *addr = NULL, *peer; 5367 struct net_device *dev = NULL; 5368 struct inet6_ifaddr *ifa; 5369 struct sk_buff *skb; 5370 int err; 5371 5372 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack); 5373 if (err < 0) 5374 return err; 5375 5376 if (tb[IFA_TARGET_NETNSID]) { 5377 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]); 5378 5379 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk, 5380 fillargs.netnsid); 5381 if (IS_ERR(tgt_net)) 5382 return PTR_ERR(tgt_net); 5383 } 5384 5385 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 5386 if (!addr) 5387 return -EINVAL; 5388 5389 ifm = nlmsg_data(nlh); 5390 if (ifm->ifa_index) 5391 dev = dev_get_by_index(tgt_net, ifm->ifa_index); 5392 5393 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1); 5394 if (!ifa) { 5395 err = -EADDRNOTAVAIL; 5396 goto errout; 5397 } 5398 5399 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 5400 if (!skb) { 5401 err = -ENOBUFS; 5402 goto errout_ifa; 5403 } 5404 5405 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5406 if (err < 0) { 5407 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5408 WARN_ON(err == -EMSGSIZE); 5409 kfree_skb(skb); 5410 goto errout_ifa; 5411 } 5412 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid); 5413 errout_ifa: 5414 in6_ifa_put(ifa); 5415 errout: 5416 if (dev) 5417 dev_put(dev); 5418 if (fillargs.netnsid >= 0) 5419 put_net(tgt_net); 5420 5421 return err; 5422 } 5423 5424 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 5425 { 5426 struct sk_buff *skb; 5427 struct net *net = dev_net(ifa->idev->dev); 5428 struct inet6_fill_args fillargs = { 5429 .portid = 0, 5430 .seq = 0, 5431 .event = event, 5432 .flags = 0, 5433 .netnsid = -1, 5434 }; 5435 int err = -ENOBUFS; 5436 5437 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 5438 if (!skb) 5439 goto errout; 5440 5441 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5442 if (err < 0) { 5443 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5444 WARN_ON(err == -EMSGSIZE); 5445 kfree_skb(skb); 5446 goto errout; 5447 } 5448 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 5449 return; 5450 errout: 5451 if (err < 0) 5452 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 5453 } 5454 5455 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 5456 __s32 *array, int bytes) 5457 { 5458 BUG_ON(bytes < (DEVCONF_MAX * 4)); 5459 5460 memset(array, 0, bytes); 5461 array[DEVCONF_FORWARDING] = cnf->forwarding; 5462 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 5463 array[DEVCONF_MTU6] = cnf->mtu6; 5464 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 5465 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 5466 array[DEVCONF_AUTOCONF] = cnf->autoconf; 5467 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 5468 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 5469 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5470 jiffies_to_msecs(cnf->rtr_solicit_interval); 5471 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5472 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 5473 array[DEVCONF_RTR_SOLICIT_DELAY] = 5474 jiffies_to_msecs(cnf->rtr_solicit_delay); 5475 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 5476 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5477 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 5478 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5479 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 5480 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 5481 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 5482 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 5483 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 5484 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 5485 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 5486 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 5487 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 5488 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 5489 #ifdef CONFIG_IPV6_ROUTER_PREF 5490 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 5491 array[DEVCONF_RTR_PROBE_INTERVAL] = 5492 jiffies_to_msecs(cnf->rtr_probe_interval); 5493 #ifdef CONFIG_IPV6_ROUTE_INFO 5494 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen; 5495 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 5496 #endif 5497 #endif 5498 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 5499 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 5500 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5501 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 5502 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 5503 #endif 5504 #ifdef CONFIG_IPV6_MROUTE 5505 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 5506 #endif 5507 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 5508 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 5509 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 5510 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 5511 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 5512 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 5513 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 5514 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 5515 /* we omit DEVCONF_STABLE_SECRET for now */ 5516 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 5517 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 5518 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 5519 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5520 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5521 #ifdef CONFIG_IPV6_SEG6_HMAC 5522 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5523 #endif 5524 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5525 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5526 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy; 5527 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass; 5528 array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled; 5529 } 5530 5531 static inline size_t inet6_ifla6_size(void) 5532 { 5533 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5534 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5535 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5536 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5537 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5538 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */ 5539 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */ 5540 + 0; 5541 } 5542 5543 static inline size_t inet6_if_nlmsg_size(void) 5544 { 5545 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5546 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5547 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5548 + nla_total_size(4) /* IFLA_MTU */ 5549 + nla_total_size(4) /* IFLA_LINK */ 5550 + nla_total_size(1) /* IFLA_OPERSTATE */ 5551 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5552 } 5553 5554 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5555 int bytes) 5556 { 5557 int i; 5558 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5559 BUG_ON(pad < 0); 5560 5561 /* Use put_unaligned() because stats may not be aligned for u64. */ 5562 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5563 for (i = 1; i < ICMP6_MIB_MAX; i++) 5564 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5565 5566 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5567 } 5568 5569 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5570 int bytes, size_t syncpoff) 5571 { 5572 int i, c; 5573 u64 buff[IPSTATS_MIB_MAX]; 5574 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5575 5576 BUG_ON(pad < 0); 5577 5578 memset(buff, 0, sizeof(buff)); 5579 buff[0] = IPSTATS_MIB_MAX; 5580 5581 for_each_possible_cpu(c) { 5582 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5583 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5584 } 5585 5586 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5587 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5588 } 5589 5590 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5591 int bytes) 5592 { 5593 switch (attrtype) { 5594 case IFLA_INET6_STATS: 5595 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5596 offsetof(struct ipstats_mib, syncp)); 5597 break; 5598 case IFLA_INET6_ICMP6STATS: 5599 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5600 break; 5601 } 5602 } 5603 5604 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5605 u32 ext_filter_mask) 5606 { 5607 struct nlattr *nla; 5608 struct ifla_cacheinfo ci; 5609 5610 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5611 goto nla_put_failure; 5612 ci.max_reasm_len = IPV6_MAXPLEN; 5613 ci.tstamp = cstamp_delta(idev->tstamp); 5614 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5615 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5616 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5617 goto nla_put_failure; 5618 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5619 if (!nla) 5620 goto nla_put_failure; 5621 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5622 5623 /* XXX - MC not implemented */ 5624 5625 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5626 return 0; 5627 5628 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5629 if (!nla) 5630 goto nla_put_failure; 5631 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5632 5633 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5634 if (!nla) 5635 goto nla_put_failure; 5636 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5637 5638 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5639 if (!nla) 5640 goto nla_put_failure; 5641 read_lock_bh(&idev->lock); 5642 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5643 read_unlock_bh(&idev->lock); 5644 5645 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5646 goto nla_put_failure; 5647 5648 return 0; 5649 5650 nla_put_failure: 5651 return -EMSGSIZE; 5652 } 5653 5654 static size_t inet6_get_link_af_size(const struct net_device *dev, 5655 u32 ext_filter_mask) 5656 { 5657 if (!__in6_dev_get(dev)) 5658 return 0; 5659 5660 return inet6_ifla6_size(); 5661 } 5662 5663 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5664 u32 ext_filter_mask) 5665 { 5666 struct inet6_dev *idev = __in6_dev_get(dev); 5667 5668 if (!idev) 5669 return -ENODATA; 5670 5671 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5672 return -EMSGSIZE; 5673 5674 return 0; 5675 } 5676 5677 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 5678 { 5679 struct inet6_ifaddr *ifp; 5680 struct net_device *dev = idev->dev; 5681 bool clear_token, update_rs = false; 5682 struct in6_addr ll_addr; 5683 5684 ASSERT_RTNL(); 5685 5686 if (!token) 5687 return -EINVAL; 5688 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 5689 return -EINVAL; 5690 if (!ipv6_accept_ra(idev)) 5691 return -EINVAL; 5692 if (idev->cnf.rtr_solicits == 0) 5693 return -EINVAL; 5694 5695 write_lock_bh(&idev->lock); 5696 5697 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5698 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5699 5700 write_unlock_bh(&idev->lock); 5701 5702 clear_token = ipv6_addr_any(token); 5703 if (clear_token) 5704 goto update_lft; 5705 5706 if (!idev->dead && (idev->if_flags & IF_READY) && 5707 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5708 IFA_F_OPTIMISTIC)) { 5709 /* If we're not ready, then normal ifup will take care 5710 * of this. Otherwise, we need to request our rs here. 5711 */ 5712 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5713 update_rs = true; 5714 } 5715 5716 update_lft: 5717 write_lock_bh(&idev->lock); 5718 5719 if (update_rs) { 5720 idev->if_flags |= IF_RS_SENT; 5721 idev->rs_interval = rfc3315_s14_backoff_init( 5722 idev->cnf.rtr_solicit_interval); 5723 idev->rs_probes = 1; 5724 addrconf_mod_rs_timer(idev, idev->rs_interval); 5725 } 5726 5727 /* Well, that's kinda nasty ... */ 5728 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5729 spin_lock(&ifp->lock); 5730 if (ifp->tokenized) { 5731 ifp->valid_lft = 0; 5732 ifp->prefered_lft = 0; 5733 } 5734 spin_unlock(&ifp->lock); 5735 } 5736 5737 write_unlock_bh(&idev->lock); 5738 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5739 addrconf_verify_rtnl(); 5740 return 0; 5741 } 5742 5743 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5744 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5745 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5746 }; 5747 5748 static int check_addr_gen_mode(int mode) 5749 { 5750 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5751 mode != IN6_ADDR_GEN_MODE_NONE && 5752 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5753 mode != IN6_ADDR_GEN_MODE_RANDOM) 5754 return -EINVAL; 5755 return 1; 5756 } 5757 5758 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5759 int mode) 5760 { 5761 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5762 !idev->cnf.stable_secret.initialized && 5763 !net->ipv6.devconf_dflt->stable_secret.initialized) 5764 return -EINVAL; 5765 return 1; 5766 } 5767 5768 static int inet6_validate_link_af(const struct net_device *dev, 5769 const struct nlattr *nla) 5770 { 5771 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5772 struct inet6_dev *idev = NULL; 5773 int err; 5774 5775 if (dev) { 5776 idev = __in6_dev_get(dev); 5777 if (!idev) 5778 return -EAFNOSUPPORT; 5779 } 5780 5781 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, 5782 inet6_af_policy, NULL); 5783 if (err) 5784 return err; 5785 5786 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE]) 5787 return -EINVAL; 5788 5789 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5790 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5791 5792 if (check_addr_gen_mode(mode) < 0) 5793 return -EINVAL; 5794 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0) 5795 return -EINVAL; 5796 } 5797 5798 return 0; 5799 } 5800 5801 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 5802 { 5803 struct inet6_dev *idev = __in6_dev_get(dev); 5804 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5805 int err; 5806 5807 if (!idev) 5808 return -EAFNOSUPPORT; 5809 5810 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 5811 BUG(); 5812 5813 if (tb[IFLA_INET6_TOKEN]) { 5814 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 5815 if (err) 5816 return err; 5817 } 5818 5819 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5820 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5821 5822 idev->cnf.addr_gen_mode = mode; 5823 } 5824 5825 return 0; 5826 } 5827 5828 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5829 u32 portid, u32 seq, int event, unsigned int flags) 5830 { 5831 struct net_device *dev = idev->dev; 5832 struct ifinfomsg *hdr; 5833 struct nlmsghdr *nlh; 5834 void *protoinfo; 5835 5836 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5837 if (!nlh) 5838 return -EMSGSIZE; 5839 5840 hdr = nlmsg_data(nlh); 5841 hdr->ifi_family = AF_INET6; 5842 hdr->__ifi_pad = 0; 5843 hdr->ifi_type = dev->type; 5844 hdr->ifi_index = dev->ifindex; 5845 hdr->ifi_flags = dev_get_flags(dev); 5846 hdr->ifi_change = 0; 5847 5848 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5849 (dev->addr_len && 5850 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5851 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5852 (dev->ifindex != dev_get_iflink(dev) && 5853 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5854 nla_put_u8(skb, IFLA_OPERSTATE, 5855 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5856 goto nla_put_failure; 5857 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO); 5858 if (!protoinfo) 5859 goto nla_put_failure; 5860 5861 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5862 goto nla_put_failure; 5863 5864 nla_nest_end(skb, protoinfo); 5865 nlmsg_end(skb, nlh); 5866 return 0; 5867 5868 nla_put_failure: 5869 nlmsg_cancel(skb, nlh); 5870 return -EMSGSIZE; 5871 } 5872 5873 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh, 5874 struct netlink_ext_ack *extack) 5875 { 5876 struct ifinfomsg *ifm; 5877 5878 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5879 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request"); 5880 return -EINVAL; 5881 } 5882 5883 if (nlmsg_attrlen(nlh, sizeof(*ifm))) { 5884 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header"); 5885 return -EINVAL; 5886 } 5887 5888 ifm = nlmsg_data(nlh); 5889 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || 5890 ifm->ifi_change || ifm->ifi_index) { 5891 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request"); 5892 return -EINVAL; 5893 } 5894 5895 return 0; 5896 } 5897 5898 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5899 { 5900 struct net *net = sock_net(skb->sk); 5901 int h, s_h; 5902 int idx = 0, s_idx; 5903 struct net_device *dev; 5904 struct inet6_dev *idev; 5905 struct hlist_head *head; 5906 5907 /* only requests using strict checking can pass data to 5908 * influence the dump 5909 */ 5910 if (cb->strict_check) { 5911 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack); 5912 5913 if (err < 0) 5914 return err; 5915 } 5916 5917 s_h = cb->args[0]; 5918 s_idx = cb->args[1]; 5919 5920 rcu_read_lock(); 5921 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5922 idx = 0; 5923 head = &net->dev_index_head[h]; 5924 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5925 if (idx < s_idx) 5926 goto cont; 5927 idev = __in6_dev_get(dev); 5928 if (!idev) 5929 goto cont; 5930 if (inet6_fill_ifinfo(skb, idev, 5931 NETLINK_CB(cb->skb).portid, 5932 cb->nlh->nlmsg_seq, 5933 RTM_NEWLINK, NLM_F_MULTI) < 0) 5934 goto out; 5935 cont: 5936 idx++; 5937 } 5938 } 5939 out: 5940 rcu_read_unlock(); 5941 cb->args[1] = idx; 5942 cb->args[0] = h; 5943 5944 return skb->len; 5945 } 5946 5947 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5948 { 5949 struct sk_buff *skb; 5950 struct net *net = dev_net(idev->dev); 5951 int err = -ENOBUFS; 5952 5953 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5954 if (!skb) 5955 goto errout; 5956 5957 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5958 if (err < 0) { 5959 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5960 WARN_ON(err == -EMSGSIZE); 5961 kfree_skb(skb); 5962 goto errout; 5963 } 5964 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5965 return; 5966 errout: 5967 if (err < 0) 5968 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5969 } 5970 5971 static inline size_t inet6_prefix_nlmsg_size(void) 5972 { 5973 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5974 + nla_total_size(sizeof(struct in6_addr)) 5975 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5976 } 5977 5978 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5979 struct prefix_info *pinfo, u32 portid, u32 seq, 5980 int event, unsigned int flags) 5981 { 5982 struct prefixmsg *pmsg; 5983 struct nlmsghdr *nlh; 5984 struct prefix_cacheinfo ci; 5985 5986 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5987 if (!nlh) 5988 return -EMSGSIZE; 5989 5990 pmsg = nlmsg_data(nlh); 5991 pmsg->prefix_family = AF_INET6; 5992 pmsg->prefix_pad1 = 0; 5993 pmsg->prefix_pad2 = 0; 5994 pmsg->prefix_ifindex = idev->dev->ifindex; 5995 pmsg->prefix_len = pinfo->prefix_len; 5996 pmsg->prefix_type = pinfo->type; 5997 pmsg->prefix_pad3 = 0; 5998 pmsg->prefix_flags = 0; 5999 if (pinfo->onlink) 6000 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 6001 if (pinfo->autoconf) 6002 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 6003 6004 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 6005 goto nla_put_failure; 6006 ci.preferred_time = ntohl(pinfo->prefered); 6007 ci.valid_time = ntohl(pinfo->valid); 6008 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 6009 goto nla_put_failure; 6010 nlmsg_end(skb, nlh); 6011 return 0; 6012 6013 nla_put_failure: 6014 nlmsg_cancel(skb, nlh); 6015 return -EMSGSIZE; 6016 } 6017 6018 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 6019 struct prefix_info *pinfo) 6020 { 6021 struct sk_buff *skb; 6022 struct net *net = dev_net(idev->dev); 6023 int err = -ENOBUFS; 6024 6025 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 6026 if (!skb) 6027 goto errout; 6028 6029 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 6030 if (err < 0) { 6031 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 6032 WARN_ON(err == -EMSGSIZE); 6033 kfree_skb(skb); 6034 goto errout; 6035 } 6036 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 6037 return; 6038 errout: 6039 if (err < 0) 6040 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 6041 } 6042 6043 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6044 { 6045 struct net *net = dev_net(ifp->idev->dev); 6046 6047 if (event) 6048 ASSERT_RTNL(); 6049 6050 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 6051 6052 switch (event) { 6053 case RTM_NEWADDR: 6054 /* 6055 * If the address was optimistic we inserted the route at the 6056 * start of our DAD process, so we don't need to do it again. 6057 * If the device was taken down in the middle of the DAD 6058 * cycle there is a race where we could get here without a 6059 * host route, so nothing to insert. That will be fixed when 6060 * the device is brought up. 6061 */ 6062 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) { 6063 ip6_ins_rt(net, ifp->rt); 6064 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) { 6065 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n", 6066 &ifp->addr, ifp->idev->dev->name); 6067 } 6068 6069 if (ifp->idev->cnf.forwarding) 6070 addrconf_join_anycast(ifp); 6071 if (!ipv6_addr_any(&ifp->peer_addr)) 6072 addrconf_prefix_route(&ifp->peer_addr, 128, 6073 ifp->rt_priority, ifp->idev->dev, 6074 0, 0, GFP_ATOMIC); 6075 break; 6076 case RTM_DELADDR: 6077 if (ifp->idev->cnf.forwarding) 6078 addrconf_leave_anycast(ifp); 6079 addrconf_leave_solict(ifp->idev, &ifp->addr); 6080 if (!ipv6_addr_any(&ifp->peer_addr)) { 6081 struct fib6_info *rt; 6082 6083 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 6084 ifp->idev->dev, 0, 0, 6085 false); 6086 if (rt) 6087 ip6_del_rt(net, rt, false); 6088 } 6089 if (ifp->rt) { 6090 ip6_del_rt(net, ifp->rt, false); 6091 ifp->rt = NULL; 6092 } 6093 rt_genid_bump_ipv6(net); 6094 break; 6095 } 6096 atomic_inc(&net->ipv6.dev_addr_genid); 6097 } 6098 6099 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6100 { 6101 rcu_read_lock_bh(); 6102 if (likely(ifp->idev->dead == 0)) 6103 __ipv6_ifa_notify(event, ifp); 6104 rcu_read_unlock_bh(); 6105 } 6106 6107 #ifdef CONFIG_SYSCTL 6108 6109 static int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 6110 void *buffer, size_t *lenp, loff_t *ppos) 6111 { 6112 int *valp = ctl->data; 6113 int val = *valp; 6114 loff_t pos = *ppos; 6115 struct ctl_table lctl; 6116 int ret; 6117 6118 /* 6119 * ctl->data points to idev->cnf.forwarding, we should 6120 * not modify it until we get the rtnl lock. 6121 */ 6122 lctl = *ctl; 6123 lctl.data = &val; 6124 6125 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6126 6127 if (write) 6128 ret = addrconf_fixup_forwarding(ctl, valp, val); 6129 if (ret) 6130 *ppos = pos; 6131 return ret; 6132 } 6133 6134 static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 6135 void *buffer, size_t *lenp, loff_t *ppos) 6136 { 6137 struct inet6_dev *idev = ctl->extra1; 6138 int min_mtu = IPV6_MIN_MTU; 6139 struct ctl_table lctl; 6140 6141 lctl = *ctl; 6142 lctl.extra1 = &min_mtu; 6143 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 6144 6145 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 6146 } 6147 6148 static void dev_disable_change(struct inet6_dev *idev) 6149 { 6150 struct netdev_notifier_info info; 6151 6152 if (!idev || !idev->dev) 6153 return; 6154 6155 netdev_notifier_info_init(&info, idev->dev); 6156 if (idev->cnf.disable_ipv6) 6157 addrconf_notify(NULL, NETDEV_DOWN, &info); 6158 else 6159 addrconf_notify(NULL, NETDEV_UP, &info); 6160 } 6161 6162 static void addrconf_disable_change(struct net *net, __s32 newf) 6163 { 6164 struct net_device *dev; 6165 struct inet6_dev *idev; 6166 6167 for_each_netdev(net, dev) { 6168 idev = __in6_dev_get(dev); 6169 if (idev) { 6170 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 6171 idev->cnf.disable_ipv6 = newf; 6172 if (changed) 6173 dev_disable_change(idev); 6174 } 6175 } 6176 } 6177 6178 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 6179 { 6180 struct net *net; 6181 int old; 6182 6183 if (!rtnl_trylock()) 6184 return restart_syscall(); 6185 6186 net = (struct net *)table->extra2; 6187 old = *p; 6188 *p = newf; 6189 6190 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 6191 rtnl_unlock(); 6192 return 0; 6193 } 6194 6195 if (p == &net->ipv6.devconf_all->disable_ipv6) { 6196 net->ipv6.devconf_dflt->disable_ipv6 = newf; 6197 addrconf_disable_change(net, newf); 6198 } else if ((!newf) ^ (!old)) 6199 dev_disable_change((struct inet6_dev *)table->extra1); 6200 6201 rtnl_unlock(); 6202 return 0; 6203 } 6204 6205 static int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 6206 void *buffer, size_t *lenp, loff_t *ppos) 6207 { 6208 int *valp = ctl->data; 6209 int val = *valp; 6210 loff_t pos = *ppos; 6211 struct ctl_table lctl; 6212 int ret; 6213 6214 /* 6215 * ctl->data points to idev->cnf.disable_ipv6, we should 6216 * not modify it until we get the rtnl lock. 6217 */ 6218 lctl = *ctl; 6219 lctl.data = &val; 6220 6221 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6222 6223 if (write) 6224 ret = addrconf_disable_ipv6(ctl, valp, val); 6225 if (ret) 6226 *ppos = pos; 6227 return ret; 6228 } 6229 6230 static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 6231 void *buffer, size_t *lenp, loff_t *ppos) 6232 { 6233 int *valp = ctl->data; 6234 int ret; 6235 int old, new; 6236 6237 old = *valp; 6238 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 6239 new = *valp; 6240 6241 if (write && old != new) { 6242 struct net *net = ctl->extra2; 6243 6244 if (!rtnl_trylock()) 6245 return restart_syscall(); 6246 6247 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 6248 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6249 NETCONFA_PROXY_NEIGH, 6250 NETCONFA_IFINDEX_DEFAULT, 6251 net->ipv6.devconf_dflt); 6252 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 6253 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6254 NETCONFA_PROXY_NEIGH, 6255 NETCONFA_IFINDEX_ALL, 6256 net->ipv6.devconf_all); 6257 else { 6258 struct inet6_dev *idev = ctl->extra1; 6259 6260 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6261 NETCONFA_PROXY_NEIGH, 6262 idev->dev->ifindex, 6263 &idev->cnf); 6264 } 6265 rtnl_unlock(); 6266 } 6267 6268 return ret; 6269 } 6270 6271 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 6272 void *buffer, size_t *lenp, 6273 loff_t *ppos) 6274 { 6275 int ret = 0; 6276 u32 new_val; 6277 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 6278 struct net *net = (struct net *)ctl->extra2; 6279 struct ctl_table tmp = { 6280 .data = &new_val, 6281 .maxlen = sizeof(new_val), 6282 .mode = ctl->mode, 6283 }; 6284 6285 if (!rtnl_trylock()) 6286 return restart_syscall(); 6287 6288 new_val = *((u32 *)ctl->data); 6289 6290 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos); 6291 if (ret != 0) 6292 goto out; 6293 6294 if (write) { 6295 if (check_addr_gen_mode(new_val) < 0) { 6296 ret = -EINVAL; 6297 goto out; 6298 } 6299 6300 if (idev) { 6301 if (check_stable_privacy(idev, net, new_val) < 0) { 6302 ret = -EINVAL; 6303 goto out; 6304 } 6305 6306 if (idev->cnf.addr_gen_mode != new_val) { 6307 idev->cnf.addr_gen_mode = new_val; 6308 addrconf_dev_config(idev->dev); 6309 } 6310 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) { 6311 struct net_device *dev; 6312 6313 net->ipv6.devconf_dflt->addr_gen_mode = new_val; 6314 for_each_netdev(net, dev) { 6315 idev = __in6_dev_get(dev); 6316 if (idev && 6317 idev->cnf.addr_gen_mode != new_val) { 6318 idev->cnf.addr_gen_mode = new_val; 6319 addrconf_dev_config(idev->dev); 6320 } 6321 } 6322 } 6323 6324 *((u32 *)ctl->data) = new_val; 6325 } 6326 6327 out: 6328 rtnl_unlock(); 6329 6330 return ret; 6331 } 6332 6333 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 6334 void *buffer, size_t *lenp, 6335 loff_t *ppos) 6336 { 6337 int err; 6338 struct in6_addr addr; 6339 char str[IPV6_MAX_STRLEN]; 6340 struct ctl_table lctl = *ctl; 6341 struct net *net = ctl->extra2; 6342 struct ipv6_stable_secret *secret = ctl->data; 6343 6344 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 6345 return -EIO; 6346 6347 lctl.maxlen = IPV6_MAX_STRLEN; 6348 lctl.data = str; 6349 6350 if (!rtnl_trylock()) 6351 return restart_syscall(); 6352 6353 if (!write && !secret->initialized) { 6354 err = -EIO; 6355 goto out; 6356 } 6357 6358 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 6359 if (err >= sizeof(str)) { 6360 err = -EIO; 6361 goto out; 6362 } 6363 6364 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 6365 if (err || !write) 6366 goto out; 6367 6368 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 6369 err = -EIO; 6370 goto out; 6371 } 6372 6373 secret->initialized = true; 6374 secret->secret = addr; 6375 6376 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 6377 struct net_device *dev; 6378 6379 for_each_netdev(net, dev) { 6380 struct inet6_dev *idev = __in6_dev_get(dev); 6381 6382 if (idev) { 6383 idev->cnf.addr_gen_mode = 6384 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6385 } 6386 } 6387 } else { 6388 struct inet6_dev *idev = ctl->extra1; 6389 6390 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6391 } 6392 6393 out: 6394 rtnl_unlock(); 6395 6396 return err; 6397 } 6398 6399 static 6400 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 6401 int write, void *buffer, 6402 size_t *lenp, 6403 loff_t *ppos) 6404 { 6405 int *valp = ctl->data; 6406 int val = *valp; 6407 loff_t pos = *ppos; 6408 struct ctl_table lctl; 6409 int ret; 6410 6411 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 6412 * we should not modify it until we get the rtnl lock. 6413 */ 6414 lctl = *ctl; 6415 lctl.data = &val; 6416 6417 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6418 6419 if (write) 6420 ret = addrconf_fixup_linkdown(ctl, valp, val); 6421 if (ret) 6422 *ppos = pos; 6423 return ret; 6424 } 6425 6426 static 6427 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 6428 { 6429 if (rt) { 6430 if (action) 6431 rt->dst.flags |= DST_NOPOLICY; 6432 else 6433 rt->dst.flags &= ~DST_NOPOLICY; 6434 } 6435 } 6436 6437 static 6438 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 6439 { 6440 struct inet6_ifaddr *ifa; 6441 6442 read_lock_bh(&idev->lock); 6443 list_for_each_entry(ifa, &idev->addr_list, if_list) { 6444 spin_lock(&ifa->lock); 6445 if (ifa->rt) { 6446 /* host routes only use builtin fib6_nh */ 6447 struct fib6_nh *nh = ifa->rt->fib6_nh; 6448 int cpu; 6449 6450 rcu_read_lock(); 6451 ifa->rt->dst_nopolicy = val ? true : false; 6452 if (nh->rt6i_pcpu) { 6453 for_each_possible_cpu(cpu) { 6454 struct rt6_info **rtp; 6455 6456 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu); 6457 addrconf_set_nopolicy(*rtp, val); 6458 } 6459 } 6460 rcu_read_unlock(); 6461 } 6462 spin_unlock(&ifa->lock); 6463 } 6464 read_unlock_bh(&idev->lock); 6465 } 6466 6467 static 6468 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 6469 { 6470 struct inet6_dev *idev; 6471 struct net *net; 6472 6473 if (!rtnl_trylock()) 6474 return restart_syscall(); 6475 6476 *valp = val; 6477 6478 net = (struct net *)ctl->extra2; 6479 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 6480 rtnl_unlock(); 6481 return 0; 6482 } 6483 6484 if (valp == &net->ipv6.devconf_all->disable_policy) { 6485 struct net_device *dev; 6486 6487 for_each_netdev(net, dev) { 6488 idev = __in6_dev_get(dev); 6489 if (idev) 6490 addrconf_disable_policy_idev(idev, val); 6491 } 6492 } else { 6493 idev = (struct inet6_dev *)ctl->extra1; 6494 addrconf_disable_policy_idev(idev, val); 6495 } 6496 6497 rtnl_unlock(); 6498 return 0; 6499 } 6500 6501 static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 6502 void *buffer, size_t *lenp, loff_t *ppos) 6503 { 6504 int *valp = ctl->data; 6505 int val = *valp; 6506 loff_t pos = *ppos; 6507 struct ctl_table lctl; 6508 int ret; 6509 6510 lctl = *ctl; 6511 lctl.data = &val; 6512 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6513 6514 if (write && (*valp != val)) 6515 ret = addrconf_disable_policy(ctl, valp, val); 6516 6517 if (ret) 6518 *ppos = pos; 6519 6520 return ret; 6521 } 6522 6523 static int minus_one = -1; 6524 static const int two_five_five = 255; 6525 6526 static const struct ctl_table addrconf_sysctl[] = { 6527 { 6528 .procname = "forwarding", 6529 .data = &ipv6_devconf.forwarding, 6530 .maxlen = sizeof(int), 6531 .mode = 0644, 6532 .proc_handler = addrconf_sysctl_forward, 6533 }, 6534 { 6535 .procname = "hop_limit", 6536 .data = &ipv6_devconf.hop_limit, 6537 .maxlen = sizeof(int), 6538 .mode = 0644, 6539 .proc_handler = proc_dointvec_minmax, 6540 .extra1 = (void *)SYSCTL_ONE, 6541 .extra2 = (void *)&two_five_five, 6542 }, 6543 { 6544 .procname = "mtu", 6545 .data = &ipv6_devconf.mtu6, 6546 .maxlen = sizeof(int), 6547 .mode = 0644, 6548 .proc_handler = addrconf_sysctl_mtu, 6549 }, 6550 { 6551 .procname = "accept_ra", 6552 .data = &ipv6_devconf.accept_ra, 6553 .maxlen = sizeof(int), 6554 .mode = 0644, 6555 .proc_handler = proc_dointvec, 6556 }, 6557 { 6558 .procname = "accept_redirects", 6559 .data = &ipv6_devconf.accept_redirects, 6560 .maxlen = sizeof(int), 6561 .mode = 0644, 6562 .proc_handler = proc_dointvec, 6563 }, 6564 { 6565 .procname = "autoconf", 6566 .data = &ipv6_devconf.autoconf, 6567 .maxlen = sizeof(int), 6568 .mode = 0644, 6569 .proc_handler = proc_dointvec, 6570 }, 6571 { 6572 .procname = "dad_transmits", 6573 .data = &ipv6_devconf.dad_transmits, 6574 .maxlen = sizeof(int), 6575 .mode = 0644, 6576 .proc_handler = proc_dointvec, 6577 }, 6578 { 6579 .procname = "router_solicitations", 6580 .data = &ipv6_devconf.rtr_solicits, 6581 .maxlen = sizeof(int), 6582 .mode = 0644, 6583 .proc_handler = proc_dointvec_minmax, 6584 .extra1 = &minus_one, 6585 }, 6586 { 6587 .procname = "router_solicitation_interval", 6588 .data = &ipv6_devconf.rtr_solicit_interval, 6589 .maxlen = sizeof(int), 6590 .mode = 0644, 6591 .proc_handler = proc_dointvec_jiffies, 6592 }, 6593 { 6594 .procname = "router_solicitation_max_interval", 6595 .data = &ipv6_devconf.rtr_solicit_max_interval, 6596 .maxlen = sizeof(int), 6597 .mode = 0644, 6598 .proc_handler = proc_dointvec_jiffies, 6599 }, 6600 { 6601 .procname = "router_solicitation_delay", 6602 .data = &ipv6_devconf.rtr_solicit_delay, 6603 .maxlen = sizeof(int), 6604 .mode = 0644, 6605 .proc_handler = proc_dointvec_jiffies, 6606 }, 6607 { 6608 .procname = "force_mld_version", 6609 .data = &ipv6_devconf.force_mld_version, 6610 .maxlen = sizeof(int), 6611 .mode = 0644, 6612 .proc_handler = proc_dointvec, 6613 }, 6614 { 6615 .procname = "mldv1_unsolicited_report_interval", 6616 .data = 6617 &ipv6_devconf.mldv1_unsolicited_report_interval, 6618 .maxlen = sizeof(int), 6619 .mode = 0644, 6620 .proc_handler = proc_dointvec_ms_jiffies, 6621 }, 6622 { 6623 .procname = "mldv2_unsolicited_report_interval", 6624 .data = 6625 &ipv6_devconf.mldv2_unsolicited_report_interval, 6626 .maxlen = sizeof(int), 6627 .mode = 0644, 6628 .proc_handler = proc_dointvec_ms_jiffies, 6629 }, 6630 { 6631 .procname = "use_tempaddr", 6632 .data = &ipv6_devconf.use_tempaddr, 6633 .maxlen = sizeof(int), 6634 .mode = 0644, 6635 .proc_handler = proc_dointvec, 6636 }, 6637 { 6638 .procname = "temp_valid_lft", 6639 .data = &ipv6_devconf.temp_valid_lft, 6640 .maxlen = sizeof(int), 6641 .mode = 0644, 6642 .proc_handler = proc_dointvec, 6643 }, 6644 { 6645 .procname = "temp_prefered_lft", 6646 .data = &ipv6_devconf.temp_prefered_lft, 6647 .maxlen = sizeof(int), 6648 .mode = 0644, 6649 .proc_handler = proc_dointvec, 6650 }, 6651 { 6652 .procname = "regen_max_retry", 6653 .data = &ipv6_devconf.regen_max_retry, 6654 .maxlen = sizeof(int), 6655 .mode = 0644, 6656 .proc_handler = proc_dointvec, 6657 }, 6658 { 6659 .procname = "max_desync_factor", 6660 .data = &ipv6_devconf.max_desync_factor, 6661 .maxlen = sizeof(int), 6662 .mode = 0644, 6663 .proc_handler = proc_dointvec, 6664 }, 6665 { 6666 .procname = "max_addresses", 6667 .data = &ipv6_devconf.max_addresses, 6668 .maxlen = sizeof(int), 6669 .mode = 0644, 6670 .proc_handler = proc_dointvec, 6671 }, 6672 { 6673 .procname = "accept_ra_defrtr", 6674 .data = &ipv6_devconf.accept_ra_defrtr, 6675 .maxlen = sizeof(int), 6676 .mode = 0644, 6677 .proc_handler = proc_dointvec, 6678 }, 6679 { 6680 .procname = "accept_ra_min_hop_limit", 6681 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6682 .maxlen = sizeof(int), 6683 .mode = 0644, 6684 .proc_handler = proc_dointvec, 6685 }, 6686 { 6687 .procname = "accept_ra_pinfo", 6688 .data = &ipv6_devconf.accept_ra_pinfo, 6689 .maxlen = sizeof(int), 6690 .mode = 0644, 6691 .proc_handler = proc_dointvec, 6692 }, 6693 #ifdef CONFIG_IPV6_ROUTER_PREF 6694 { 6695 .procname = "accept_ra_rtr_pref", 6696 .data = &ipv6_devconf.accept_ra_rtr_pref, 6697 .maxlen = sizeof(int), 6698 .mode = 0644, 6699 .proc_handler = proc_dointvec, 6700 }, 6701 { 6702 .procname = "router_probe_interval", 6703 .data = &ipv6_devconf.rtr_probe_interval, 6704 .maxlen = sizeof(int), 6705 .mode = 0644, 6706 .proc_handler = proc_dointvec_jiffies, 6707 }, 6708 #ifdef CONFIG_IPV6_ROUTE_INFO 6709 { 6710 .procname = "accept_ra_rt_info_min_plen", 6711 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6712 .maxlen = sizeof(int), 6713 .mode = 0644, 6714 .proc_handler = proc_dointvec, 6715 }, 6716 { 6717 .procname = "accept_ra_rt_info_max_plen", 6718 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6719 .maxlen = sizeof(int), 6720 .mode = 0644, 6721 .proc_handler = proc_dointvec, 6722 }, 6723 #endif 6724 #endif 6725 { 6726 .procname = "proxy_ndp", 6727 .data = &ipv6_devconf.proxy_ndp, 6728 .maxlen = sizeof(int), 6729 .mode = 0644, 6730 .proc_handler = addrconf_sysctl_proxy_ndp, 6731 }, 6732 { 6733 .procname = "accept_source_route", 6734 .data = &ipv6_devconf.accept_source_route, 6735 .maxlen = sizeof(int), 6736 .mode = 0644, 6737 .proc_handler = proc_dointvec, 6738 }, 6739 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6740 { 6741 .procname = "optimistic_dad", 6742 .data = &ipv6_devconf.optimistic_dad, 6743 .maxlen = sizeof(int), 6744 .mode = 0644, 6745 .proc_handler = proc_dointvec, 6746 }, 6747 { 6748 .procname = "use_optimistic", 6749 .data = &ipv6_devconf.use_optimistic, 6750 .maxlen = sizeof(int), 6751 .mode = 0644, 6752 .proc_handler = proc_dointvec, 6753 }, 6754 #endif 6755 #ifdef CONFIG_IPV6_MROUTE 6756 { 6757 .procname = "mc_forwarding", 6758 .data = &ipv6_devconf.mc_forwarding, 6759 .maxlen = sizeof(int), 6760 .mode = 0444, 6761 .proc_handler = proc_dointvec, 6762 }, 6763 #endif 6764 { 6765 .procname = "disable_ipv6", 6766 .data = &ipv6_devconf.disable_ipv6, 6767 .maxlen = sizeof(int), 6768 .mode = 0644, 6769 .proc_handler = addrconf_sysctl_disable, 6770 }, 6771 { 6772 .procname = "accept_dad", 6773 .data = &ipv6_devconf.accept_dad, 6774 .maxlen = sizeof(int), 6775 .mode = 0644, 6776 .proc_handler = proc_dointvec, 6777 }, 6778 { 6779 .procname = "force_tllao", 6780 .data = &ipv6_devconf.force_tllao, 6781 .maxlen = sizeof(int), 6782 .mode = 0644, 6783 .proc_handler = proc_dointvec 6784 }, 6785 { 6786 .procname = "ndisc_notify", 6787 .data = &ipv6_devconf.ndisc_notify, 6788 .maxlen = sizeof(int), 6789 .mode = 0644, 6790 .proc_handler = proc_dointvec 6791 }, 6792 { 6793 .procname = "suppress_frag_ndisc", 6794 .data = &ipv6_devconf.suppress_frag_ndisc, 6795 .maxlen = sizeof(int), 6796 .mode = 0644, 6797 .proc_handler = proc_dointvec 6798 }, 6799 { 6800 .procname = "accept_ra_from_local", 6801 .data = &ipv6_devconf.accept_ra_from_local, 6802 .maxlen = sizeof(int), 6803 .mode = 0644, 6804 .proc_handler = proc_dointvec, 6805 }, 6806 { 6807 .procname = "accept_ra_mtu", 6808 .data = &ipv6_devconf.accept_ra_mtu, 6809 .maxlen = sizeof(int), 6810 .mode = 0644, 6811 .proc_handler = proc_dointvec, 6812 }, 6813 { 6814 .procname = "stable_secret", 6815 .data = &ipv6_devconf.stable_secret, 6816 .maxlen = IPV6_MAX_STRLEN, 6817 .mode = 0600, 6818 .proc_handler = addrconf_sysctl_stable_secret, 6819 }, 6820 { 6821 .procname = "use_oif_addrs_only", 6822 .data = &ipv6_devconf.use_oif_addrs_only, 6823 .maxlen = sizeof(int), 6824 .mode = 0644, 6825 .proc_handler = proc_dointvec, 6826 }, 6827 { 6828 .procname = "ignore_routes_with_linkdown", 6829 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6830 .maxlen = sizeof(int), 6831 .mode = 0644, 6832 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6833 }, 6834 { 6835 .procname = "drop_unicast_in_l2_multicast", 6836 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6837 .maxlen = sizeof(int), 6838 .mode = 0644, 6839 .proc_handler = proc_dointvec, 6840 }, 6841 { 6842 .procname = "drop_unsolicited_na", 6843 .data = &ipv6_devconf.drop_unsolicited_na, 6844 .maxlen = sizeof(int), 6845 .mode = 0644, 6846 .proc_handler = proc_dointvec, 6847 }, 6848 { 6849 .procname = "keep_addr_on_down", 6850 .data = &ipv6_devconf.keep_addr_on_down, 6851 .maxlen = sizeof(int), 6852 .mode = 0644, 6853 .proc_handler = proc_dointvec, 6854 6855 }, 6856 { 6857 .procname = "seg6_enabled", 6858 .data = &ipv6_devconf.seg6_enabled, 6859 .maxlen = sizeof(int), 6860 .mode = 0644, 6861 .proc_handler = proc_dointvec, 6862 }, 6863 #ifdef CONFIG_IPV6_SEG6_HMAC 6864 { 6865 .procname = "seg6_require_hmac", 6866 .data = &ipv6_devconf.seg6_require_hmac, 6867 .maxlen = sizeof(int), 6868 .mode = 0644, 6869 .proc_handler = proc_dointvec, 6870 }, 6871 #endif 6872 { 6873 .procname = "enhanced_dad", 6874 .data = &ipv6_devconf.enhanced_dad, 6875 .maxlen = sizeof(int), 6876 .mode = 0644, 6877 .proc_handler = proc_dointvec, 6878 }, 6879 { 6880 .procname = "addr_gen_mode", 6881 .data = &ipv6_devconf.addr_gen_mode, 6882 .maxlen = sizeof(int), 6883 .mode = 0644, 6884 .proc_handler = addrconf_sysctl_addr_gen_mode, 6885 }, 6886 { 6887 .procname = "disable_policy", 6888 .data = &ipv6_devconf.disable_policy, 6889 .maxlen = sizeof(int), 6890 .mode = 0644, 6891 .proc_handler = addrconf_sysctl_disable_policy, 6892 }, 6893 { 6894 .procname = "ndisc_tclass", 6895 .data = &ipv6_devconf.ndisc_tclass, 6896 .maxlen = sizeof(int), 6897 .mode = 0644, 6898 .proc_handler = proc_dointvec_minmax, 6899 .extra1 = (void *)SYSCTL_ZERO, 6900 .extra2 = (void *)&two_five_five, 6901 }, 6902 { 6903 .procname = "rpl_seg_enabled", 6904 .data = &ipv6_devconf.rpl_seg_enabled, 6905 .maxlen = sizeof(int), 6906 .mode = 0644, 6907 .proc_handler = proc_dointvec, 6908 }, 6909 { 6910 /* sentinel */ 6911 } 6912 }; 6913 6914 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 6915 struct inet6_dev *idev, struct ipv6_devconf *p) 6916 { 6917 int i, ifindex; 6918 struct ctl_table *table; 6919 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 6920 6921 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 6922 if (!table) 6923 goto out; 6924 6925 for (i = 0; table[i].data; i++) { 6926 table[i].data += (char *)p - (char *)&ipv6_devconf; 6927 /* If one of these is already set, then it is not safe to 6928 * overwrite either of them: this makes proc_dointvec_minmax 6929 * usable. 6930 */ 6931 if (!table[i].extra1 && !table[i].extra2) { 6932 table[i].extra1 = idev; /* embedded; no ref */ 6933 table[i].extra2 = net; 6934 } 6935 } 6936 6937 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 6938 6939 p->sysctl_header = register_net_sysctl(net, path, table); 6940 if (!p->sysctl_header) 6941 goto free; 6942 6943 if (!strcmp(dev_name, "all")) 6944 ifindex = NETCONFA_IFINDEX_ALL; 6945 else if (!strcmp(dev_name, "default")) 6946 ifindex = NETCONFA_IFINDEX_DEFAULT; 6947 else 6948 ifindex = idev->dev->ifindex; 6949 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 6950 ifindex, p); 6951 return 0; 6952 6953 free: 6954 kfree(table); 6955 out: 6956 return -ENOBUFS; 6957 } 6958 6959 static void __addrconf_sysctl_unregister(struct net *net, 6960 struct ipv6_devconf *p, int ifindex) 6961 { 6962 struct ctl_table *table; 6963 6964 if (!p->sysctl_header) 6965 return; 6966 6967 table = p->sysctl_header->ctl_table_arg; 6968 unregister_net_sysctl_table(p->sysctl_header); 6969 p->sysctl_header = NULL; 6970 kfree(table); 6971 6972 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 6973 } 6974 6975 static int addrconf_sysctl_register(struct inet6_dev *idev) 6976 { 6977 int err; 6978 6979 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 6980 return -EINVAL; 6981 6982 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 6983 &ndisc_ifinfo_sysctl_change); 6984 if (err) 6985 return err; 6986 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 6987 idev, &idev->cnf); 6988 if (err) 6989 neigh_sysctl_unregister(idev->nd_parms); 6990 6991 return err; 6992 } 6993 6994 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 6995 { 6996 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 6997 idev->dev->ifindex); 6998 neigh_sysctl_unregister(idev->nd_parms); 6999 } 7000 7001 7002 #endif 7003 7004 static int __net_init addrconf_init_net(struct net *net) 7005 { 7006 int err = -ENOMEM; 7007 struct ipv6_devconf *all, *dflt; 7008 7009 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 7010 if (!all) 7011 goto err_alloc_all; 7012 7013 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 7014 if (!dflt) 7015 goto err_alloc_dflt; 7016 7017 if (IS_ENABLED(CONFIG_SYSCTL) && 7018 !net_eq(net, &init_net)) { 7019 switch (sysctl_devconf_inherit_init_net) { 7020 case 1: /* copy from init_net */ 7021 memcpy(all, init_net.ipv6.devconf_all, 7022 sizeof(ipv6_devconf)); 7023 memcpy(dflt, init_net.ipv6.devconf_dflt, 7024 sizeof(ipv6_devconf_dflt)); 7025 break; 7026 case 3: /* copy from the current netns */ 7027 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all, 7028 sizeof(ipv6_devconf)); 7029 memcpy(dflt, 7030 current->nsproxy->net_ns->ipv6.devconf_dflt, 7031 sizeof(ipv6_devconf_dflt)); 7032 break; 7033 case 0: 7034 case 2: 7035 /* use compiled values */ 7036 break; 7037 } 7038 } 7039 7040 /* these will be inherited by all namespaces */ 7041 dflt->autoconf = ipv6_defaults.autoconf; 7042 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 7043 7044 dflt->stable_secret.initialized = false; 7045 all->stable_secret.initialized = false; 7046 7047 net->ipv6.devconf_all = all; 7048 net->ipv6.devconf_dflt = dflt; 7049 7050 #ifdef CONFIG_SYSCTL 7051 err = __addrconf_sysctl_register(net, "all", NULL, all); 7052 if (err < 0) 7053 goto err_reg_all; 7054 7055 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 7056 if (err < 0) 7057 goto err_reg_dflt; 7058 #endif 7059 return 0; 7060 7061 #ifdef CONFIG_SYSCTL 7062 err_reg_dflt: 7063 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 7064 err_reg_all: 7065 kfree(dflt); 7066 #endif 7067 err_alloc_dflt: 7068 kfree(all); 7069 err_alloc_all: 7070 return err; 7071 } 7072 7073 static void __net_exit addrconf_exit_net(struct net *net) 7074 { 7075 #ifdef CONFIG_SYSCTL 7076 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 7077 NETCONFA_IFINDEX_DEFAULT); 7078 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 7079 NETCONFA_IFINDEX_ALL); 7080 #endif 7081 kfree(net->ipv6.devconf_dflt); 7082 kfree(net->ipv6.devconf_all); 7083 } 7084 7085 static struct pernet_operations addrconf_ops = { 7086 .init = addrconf_init_net, 7087 .exit = addrconf_exit_net, 7088 }; 7089 7090 static struct rtnl_af_ops inet6_ops __read_mostly = { 7091 .family = AF_INET6, 7092 .fill_link_af = inet6_fill_link_af, 7093 .get_link_af_size = inet6_get_link_af_size, 7094 .validate_link_af = inet6_validate_link_af, 7095 .set_link_af = inet6_set_link_af, 7096 }; 7097 7098 /* 7099 * Init / cleanup code 7100 */ 7101 7102 int __init addrconf_init(void) 7103 { 7104 struct inet6_dev *idev; 7105 int i, err; 7106 7107 err = ipv6_addr_label_init(); 7108 if (err < 0) { 7109 pr_crit("%s: cannot initialize default policy table: %d\n", 7110 __func__, err); 7111 goto out; 7112 } 7113 7114 err = register_pernet_subsys(&addrconf_ops); 7115 if (err < 0) 7116 goto out_addrlabel; 7117 7118 addrconf_wq = create_workqueue("ipv6_addrconf"); 7119 if (!addrconf_wq) { 7120 err = -ENOMEM; 7121 goto out_nowq; 7122 } 7123 7124 /* The addrconf netdev notifier requires that loopback_dev 7125 * has it's ipv6 private information allocated and setup 7126 * before it can bring up and give link-local addresses 7127 * to other devices which are up. 7128 * 7129 * Unfortunately, loopback_dev is not necessarily the first 7130 * entry in the global dev_base list of net devices. In fact, 7131 * it is likely to be the very last entry on that list. 7132 * So this causes the notifier registry below to try and 7133 * give link-local addresses to all devices besides loopback_dev 7134 * first, then loopback_dev, which cases all the non-loopback_dev 7135 * devices to fail to get a link-local address. 7136 * 7137 * So, as a temporary fix, allocate the ipv6 structure for 7138 * loopback_dev first by hand. 7139 * Longer term, all of the dependencies ipv6 has upon the loopback 7140 * device and it being up should be removed. 7141 */ 7142 rtnl_lock(); 7143 idev = ipv6_add_dev(init_net.loopback_dev); 7144 rtnl_unlock(); 7145 if (IS_ERR(idev)) { 7146 err = PTR_ERR(idev); 7147 goto errlo; 7148 } 7149 7150 ip6_route_init_special_entries(); 7151 7152 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7153 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 7154 7155 register_netdevice_notifier(&ipv6_dev_notf); 7156 7157 addrconf_verify(); 7158 7159 rtnl_af_register(&inet6_ops); 7160 7161 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK, 7162 NULL, inet6_dump_ifinfo, 0); 7163 if (err < 0) 7164 goto errout; 7165 7166 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR, 7167 inet6_rtm_newaddr, NULL, 0); 7168 if (err < 0) 7169 goto errout; 7170 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR, 7171 inet6_rtm_deladdr, NULL, 0); 7172 if (err < 0) 7173 goto errout; 7174 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR, 7175 inet6_rtm_getaddr, inet6_dump_ifaddr, 7176 RTNL_FLAG_DOIT_UNLOCKED); 7177 if (err < 0) 7178 goto errout; 7179 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST, 7180 NULL, inet6_dump_ifmcaddr, 0); 7181 if (err < 0) 7182 goto errout; 7183 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST, 7184 NULL, inet6_dump_ifacaddr, 0); 7185 if (err < 0) 7186 goto errout; 7187 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF, 7188 inet6_netconf_get_devconf, 7189 inet6_netconf_dump_devconf, 7190 RTNL_FLAG_DOIT_UNLOCKED); 7191 if (err < 0) 7192 goto errout; 7193 err = ipv6_addr_label_rtnl_register(); 7194 if (err < 0) 7195 goto errout; 7196 7197 return 0; 7198 errout: 7199 rtnl_unregister_all(PF_INET6); 7200 rtnl_af_unregister(&inet6_ops); 7201 unregister_netdevice_notifier(&ipv6_dev_notf); 7202 errlo: 7203 destroy_workqueue(addrconf_wq); 7204 out_nowq: 7205 unregister_pernet_subsys(&addrconf_ops); 7206 out_addrlabel: 7207 ipv6_addr_label_cleanup(); 7208 out: 7209 return err; 7210 } 7211 7212 void addrconf_cleanup(void) 7213 { 7214 struct net_device *dev; 7215 int i; 7216 7217 unregister_netdevice_notifier(&ipv6_dev_notf); 7218 unregister_pernet_subsys(&addrconf_ops); 7219 ipv6_addr_label_cleanup(); 7220 7221 rtnl_af_unregister(&inet6_ops); 7222 7223 rtnl_lock(); 7224 7225 /* clean dev list */ 7226 for_each_netdev(&init_net, dev) { 7227 if (__in6_dev_get(dev) == NULL) 7228 continue; 7229 addrconf_ifdown(dev, true); 7230 } 7231 addrconf_ifdown(init_net.loopback_dev, true); 7232 7233 /* 7234 * Check hash table. 7235 */ 7236 spin_lock_bh(&addrconf_hash_lock); 7237 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7238 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 7239 spin_unlock_bh(&addrconf_hash_lock); 7240 cancel_delayed_work(&addr_chk_work); 7241 rtnl_unlock(); 7242 7243 destroy_workqueue(addrconf_wq); 7244 } 7245