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 static struct net_device * 1897 __ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1898 const struct net_device *dev, bool skip_dev_check, 1899 int strict, u32 banned_flags) 1900 { 1901 unsigned int hash = inet6_addr_hash(net, addr); 1902 struct net_device *l3mdev, *ndev; 1903 struct inet6_ifaddr *ifp; 1904 u32 ifp_flags; 1905 1906 rcu_read_lock(); 1907 1908 l3mdev = l3mdev_master_dev_rcu(dev); 1909 if (skip_dev_check) 1910 dev = NULL; 1911 1912 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1913 ndev = ifp->idev->dev; 1914 if (!net_eq(dev_net(ndev), net)) 1915 continue; 1916 1917 if (l3mdev_master_dev_rcu(ndev) != l3mdev) 1918 continue; 1919 1920 /* Decouple optimistic from tentative for evaluation here. 1921 * Ban optimistic addresses explicitly, when required. 1922 */ 1923 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1924 ? (ifp->flags&~IFA_F_TENTATIVE) 1925 : ifp->flags; 1926 if (ipv6_addr_equal(&ifp->addr, addr) && 1927 !(ifp_flags&banned_flags) && 1928 (!dev || ndev == dev || 1929 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1930 rcu_read_unlock(); 1931 return ndev; 1932 } 1933 } 1934 1935 rcu_read_unlock(); 1936 return NULL; 1937 } 1938 1939 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1940 const struct net_device *dev, bool skip_dev_check, 1941 int strict, u32 banned_flags) 1942 { 1943 return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check, 1944 strict, banned_flags) ? 1 : 0; 1945 } 1946 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1947 1948 1949 /* Compares an address/prefix_len with addresses on device @dev. 1950 * If one is found it returns true. 1951 */ 1952 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1953 const unsigned int prefix_len, struct net_device *dev) 1954 { 1955 const struct inet6_ifaddr *ifa; 1956 const struct inet6_dev *idev; 1957 bool ret = false; 1958 1959 rcu_read_lock(); 1960 idev = __in6_dev_get(dev); 1961 if (idev) { 1962 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1963 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1964 if (ret) 1965 break; 1966 } 1967 } 1968 rcu_read_unlock(); 1969 1970 return ret; 1971 } 1972 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1973 1974 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1975 { 1976 const struct inet6_ifaddr *ifa; 1977 const struct inet6_dev *idev; 1978 int onlink; 1979 1980 onlink = 0; 1981 rcu_read_lock(); 1982 idev = __in6_dev_get(dev); 1983 if (idev) { 1984 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1985 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1986 ifa->prefix_len); 1987 if (onlink) 1988 break; 1989 } 1990 } 1991 rcu_read_unlock(); 1992 return onlink; 1993 } 1994 EXPORT_SYMBOL(ipv6_chk_prefix); 1995 1996 /** 1997 * ipv6_dev_find - find the first device with a given source address. 1998 * @net: the net namespace 1999 * @addr: the source address 2000 * 2001 * The caller should be protected by RCU, or RTNL. 2002 */ 2003 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr, 2004 struct net_device *dev) 2005 { 2006 return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1, 2007 IFA_F_TENTATIVE); 2008 } 2009 EXPORT_SYMBOL(ipv6_dev_find); 2010 2011 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 2012 struct net_device *dev, int strict) 2013 { 2014 unsigned int hash = inet6_addr_hash(net, addr); 2015 struct inet6_ifaddr *ifp, *result = NULL; 2016 2017 rcu_read_lock(); 2018 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 2019 if (!net_eq(dev_net(ifp->idev->dev), net)) 2020 continue; 2021 if (ipv6_addr_equal(&ifp->addr, addr)) { 2022 if (!dev || ifp->idev->dev == dev || 2023 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 2024 result = ifp; 2025 in6_ifa_hold(ifp); 2026 break; 2027 } 2028 } 2029 } 2030 rcu_read_unlock(); 2031 2032 return result; 2033 } 2034 2035 /* Gets referenced address, destroys ifaddr */ 2036 2037 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 2038 { 2039 if (dad_failed) 2040 ifp->flags |= IFA_F_DADFAILED; 2041 2042 if (ifp->flags&IFA_F_TEMPORARY) { 2043 struct inet6_ifaddr *ifpub; 2044 spin_lock_bh(&ifp->lock); 2045 ifpub = ifp->ifpub; 2046 if (ifpub) { 2047 in6_ifa_hold(ifpub); 2048 spin_unlock_bh(&ifp->lock); 2049 ipv6_create_tempaddr(ifpub, true); 2050 in6_ifa_put(ifpub); 2051 } else { 2052 spin_unlock_bh(&ifp->lock); 2053 } 2054 ipv6_del_addr(ifp); 2055 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) { 2056 spin_lock_bh(&ifp->lock); 2057 addrconf_del_dad_work(ifp); 2058 ifp->flags |= IFA_F_TENTATIVE; 2059 if (dad_failed) 2060 ifp->flags &= ~IFA_F_OPTIMISTIC; 2061 spin_unlock_bh(&ifp->lock); 2062 if (dad_failed) 2063 ipv6_ifa_notify(0, ifp); 2064 in6_ifa_put(ifp); 2065 } else { 2066 ipv6_del_addr(ifp); 2067 } 2068 } 2069 2070 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 2071 { 2072 int err = -ENOENT; 2073 2074 spin_lock_bh(&ifp->lock); 2075 if (ifp->state == INET6_IFADDR_STATE_DAD) { 2076 ifp->state = INET6_IFADDR_STATE_POSTDAD; 2077 err = 0; 2078 } 2079 spin_unlock_bh(&ifp->lock); 2080 2081 return err; 2082 } 2083 2084 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp) 2085 { 2086 struct inet6_dev *idev = ifp->idev; 2087 struct net *net = dev_net(ifp->idev->dev); 2088 2089 if (addrconf_dad_end(ifp)) { 2090 in6_ifa_put(ifp); 2091 return; 2092 } 2093 2094 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n", 2095 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source); 2096 2097 spin_lock_bh(&ifp->lock); 2098 2099 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 2100 struct in6_addr new_addr; 2101 struct inet6_ifaddr *ifp2; 2102 int retries = ifp->stable_privacy_retry + 1; 2103 struct ifa6_config cfg = { 2104 .pfx = &new_addr, 2105 .plen = ifp->prefix_len, 2106 .ifa_flags = ifp->flags, 2107 .valid_lft = ifp->valid_lft, 2108 .preferred_lft = ifp->prefered_lft, 2109 .scope = ifp->scope, 2110 }; 2111 2112 if (retries > net->ipv6.sysctl.idgen_retries) { 2113 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 2114 ifp->idev->dev->name); 2115 goto errdad; 2116 } 2117 2118 new_addr = ifp->addr; 2119 if (ipv6_generate_stable_address(&new_addr, retries, 2120 idev)) 2121 goto errdad; 2122 2123 spin_unlock_bh(&ifp->lock); 2124 2125 if (idev->cnf.max_addresses && 2126 ipv6_count_addresses(idev) >= 2127 idev->cnf.max_addresses) 2128 goto lock_errdad; 2129 2130 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 2131 ifp->idev->dev->name); 2132 2133 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL); 2134 if (IS_ERR(ifp2)) 2135 goto lock_errdad; 2136 2137 spin_lock_bh(&ifp2->lock); 2138 ifp2->stable_privacy_retry = retries; 2139 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2140 spin_unlock_bh(&ifp2->lock); 2141 2142 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2143 in6_ifa_put(ifp2); 2144 lock_errdad: 2145 spin_lock_bh(&ifp->lock); 2146 } 2147 2148 errdad: 2149 /* transition from _POSTDAD to _ERRDAD */ 2150 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2151 spin_unlock_bh(&ifp->lock); 2152 2153 addrconf_mod_dad_work(ifp, 0); 2154 in6_ifa_put(ifp); 2155 } 2156 2157 /* Join to solicited addr multicast group. 2158 * caller must hold RTNL */ 2159 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2160 { 2161 struct in6_addr maddr; 2162 2163 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2164 return; 2165 2166 addrconf_addr_solict_mult(addr, &maddr); 2167 ipv6_dev_mc_inc(dev, &maddr); 2168 } 2169 2170 /* caller must hold RTNL */ 2171 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2172 { 2173 struct in6_addr maddr; 2174 2175 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2176 return; 2177 2178 addrconf_addr_solict_mult(addr, &maddr); 2179 __ipv6_dev_mc_dec(idev, &maddr); 2180 } 2181 2182 /* caller must hold RTNL */ 2183 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2184 { 2185 struct in6_addr addr; 2186 2187 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2188 return; 2189 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2190 if (ipv6_addr_any(&addr)) 2191 return; 2192 __ipv6_dev_ac_inc(ifp->idev, &addr); 2193 } 2194 2195 /* caller must hold RTNL */ 2196 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2197 { 2198 struct in6_addr addr; 2199 2200 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2201 return; 2202 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2203 if (ipv6_addr_any(&addr)) 2204 return; 2205 __ipv6_dev_ac_dec(ifp->idev, &addr); 2206 } 2207 2208 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2209 { 2210 switch (dev->addr_len) { 2211 case ETH_ALEN: 2212 memcpy(eui, dev->dev_addr, 3); 2213 eui[3] = 0xFF; 2214 eui[4] = 0xFE; 2215 memcpy(eui + 5, dev->dev_addr + 3, 3); 2216 break; 2217 case EUI64_ADDR_LEN: 2218 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2219 eui[0] ^= 2; 2220 break; 2221 default: 2222 return -1; 2223 } 2224 2225 return 0; 2226 } 2227 2228 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2229 { 2230 union fwnet_hwaddr *ha; 2231 2232 if (dev->addr_len != FWNET_ALEN) 2233 return -1; 2234 2235 ha = (union fwnet_hwaddr *)dev->dev_addr; 2236 2237 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2238 eui[0] ^= 2; 2239 return 0; 2240 } 2241 2242 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2243 { 2244 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2245 if (dev->addr_len != ARCNET_ALEN) 2246 return -1; 2247 memset(eui, 0, 7); 2248 eui[7] = *(u8 *)dev->dev_addr; 2249 return 0; 2250 } 2251 2252 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2253 { 2254 if (dev->addr_len != INFINIBAND_ALEN) 2255 return -1; 2256 memcpy(eui, dev->dev_addr + 12, 8); 2257 eui[0] |= 2; 2258 return 0; 2259 } 2260 2261 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2262 { 2263 if (addr == 0) 2264 return -1; 2265 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2266 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2267 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2268 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2269 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2270 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2271 eui[1] = 0; 2272 eui[2] = 0x5E; 2273 eui[3] = 0xFE; 2274 memcpy(eui + 4, &addr, 4); 2275 return 0; 2276 } 2277 2278 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2279 { 2280 if (dev->priv_flags & IFF_ISATAP) 2281 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2282 return -1; 2283 } 2284 2285 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2286 { 2287 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2288 } 2289 2290 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2291 { 2292 memcpy(eui, dev->perm_addr, 3); 2293 memcpy(eui + 5, dev->perm_addr + 3, 3); 2294 eui[3] = 0xFF; 2295 eui[4] = 0xFE; 2296 eui[0] ^= 2; 2297 return 0; 2298 } 2299 2300 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2301 { 2302 switch (dev->type) { 2303 case ARPHRD_ETHER: 2304 case ARPHRD_FDDI: 2305 return addrconf_ifid_eui48(eui, dev); 2306 case ARPHRD_ARCNET: 2307 return addrconf_ifid_arcnet(eui, dev); 2308 case ARPHRD_INFINIBAND: 2309 return addrconf_ifid_infiniband(eui, dev); 2310 case ARPHRD_SIT: 2311 return addrconf_ifid_sit(eui, dev); 2312 case ARPHRD_IPGRE: 2313 case ARPHRD_TUNNEL: 2314 return addrconf_ifid_gre(eui, dev); 2315 case ARPHRD_6LOWPAN: 2316 return addrconf_ifid_6lowpan(eui, dev); 2317 case ARPHRD_IEEE1394: 2318 return addrconf_ifid_ieee1394(eui, dev); 2319 case ARPHRD_TUNNEL6: 2320 case ARPHRD_IP6GRE: 2321 case ARPHRD_RAWIP: 2322 return addrconf_ifid_ip6tnl(eui, dev); 2323 } 2324 return -1; 2325 } 2326 2327 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2328 { 2329 int err = -1; 2330 struct inet6_ifaddr *ifp; 2331 2332 read_lock_bh(&idev->lock); 2333 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2334 if (ifp->scope > IFA_LINK) 2335 break; 2336 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2337 memcpy(eui, ifp->addr.s6_addr+8, 8); 2338 err = 0; 2339 break; 2340 } 2341 } 2342 read_unlock_bh(&idev->lock); 2343 return err; 2344 } 2345 2346 /* Generation of a randomized Interface Identifier 2347 * draft-ietf-6man-rfc4941bis, Section 3.3.1 2348 */ 2349 2350 static void ipv6_gen_rnd_iid(struct in6_addr *addr) 2351 { 2352 regen: 2353 get_random_bytes(&addr->s6_addr[8], 8); 2354 2355 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1: 2356 * check if generated address is not inappropriate: 2357 * 2358 * - Reserved IPv6 Interface Identifers 2359 * - XXX: already assigned to an address on the device 2360 */ 2361 2362 /* Subnet-router anycast: 0000:0000:0000:0000 */ 2363 if (!(addr->s6_addr32[2] | addr->s6_addr32[3])) 2364 goto regen; 2365 2366 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212 2367 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213 2368 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF 2369 */ 2370 if (ntohl(addr->s6_addr32[2]) == 0x02005eff && 2371 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000) 2372 goto regen; 2373 2374 /* Reserved subnet anycast addresses */ 2375 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff && 2376 ntohl(addr->s6_addr32[3]) >= 0Xffffff80) 2377 goto regen; 2378 } 2379 2380 /* 2381 * Add prefix route. 2382 */ 2383 2384 static void 2385 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric, 2386 struct net_device *dev, unsigned long expires, 2387 u32 flags, gfp_t gfp_flags) 2388 { 2389 struct fib6_config cfg = { 2390 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2391 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF, 2392 .fc_ifindex = dev->ifindex, 2393 .fc_expires = expires, 2394 .fc_dst_len = plen, 2395 .fc_flags = RTF_UP | flags, 2396 .fc_nlinfo.nl_net = dev_net(dev), 2397 .fc_protocol = RTPROT_KERNEL, 2398 .fc_type = RTN_UNICAST, 2399 }; 2400 2401 cfg.fc_dst = *pfx; 2402 2403 /* Prevent useless cloning on PtP SIT. 2404 This thing is done here expecting that the whole 2405 class of non-broadcast devices need not cloning. 2406 */ 2407 #if IS_ENABLED(CONFIG_IPV6_SIT) 2408 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2409 cfg.fc_flags |= RTF_NONEXTHOP; 2410 #endif 2411 2412 ip6_route_add(&cfg, gfp_flags, NULL); 2413 } 2414 2415 2416 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2417 int plen, 2418 const struct net_device *dev, 2419 u32 flags, u32 noflags, 2420 bool no_gw) 2421 { 2422 struct fib6_node *fn; 2423 struct fib6_info *rt = NULL; 2424 struct fib6_table *table; 2425 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2426 2427 table = fib6_get_table(dev_net(dev), tb_id); 2428 if (!table) 2429 return NULL; 2430 2431 rcu_read_lock(); 2432 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true); 2433 if (!fn) 2434 goto out; 2435 2436 for_each_fib6_node_rt_rcu(fn) { 2437 /* prefix routes only use builtin fib6_nh */ 2438 if (rt->nh) 2439 continue; 2440 2441 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex) 2442 continue; 2443 if (no_gw && rt->fib6_nh->fib_nh_gw_family) 2444 continue; 2445 if ((rt->fib6_flags & flags) != flags) 2446 continue; 2447 if ((rt->fib6_flags & noflags) != 0) 2448 continue; 2449 if (!fib6_info_hold_safe(rt)) 2450 continue; 2451 break; 2452 } 2453 out: 2454 rcu_read_unlock(); 2455 return rt; 2456 } 2457 2458 2459 /* Create "default" multicast route to the interface */ 2460 2461 static void addrconf_add_mroute(struct net_device *dev) 2462 { 2463 struct fib6_config cfg = { 2464 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2465 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2466 .fc_ifindex = dev->ifindex, 2467 .fc_dst_len = 8, 2468 .fc_flags = RTF_UP, 2469 .fc_type = RTN_UNICAST, 2470 .fc_nlinfo.nl_net = dev_net(dev), 2471 }; 2472 2473 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2474 2475 ip6_route_add(&cfg, GFP_KERNEL, NULL); 2476 } 2477 2478 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2479 { 2480 struct inet6_dev *idev; 2481 2482 ASSERT_RTNL(); 2483 2484 idev = ipv6_find_idev(dev); 2485 if (IS_ERR(idev)) 2486 return idev; 2487 2488 if (idev->cnf.disable_ipv6) 2489 return ERR_PTR(-EACCES); 2490 2491 /* Add default multicast route */ 2492 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2493 addrconf_add_mroute(dev); 2494 2495 return idev; 2496 } 2497 2498 static void manage_tempaddrs(struct inet6_dev *idev, 2499 struct inet6_ifaddr *ifp, 2500 __u32 valid_lft, __u32 prefered_lft, 2501 bool create, unsigned long now) 2502 { 2503 u32 flags; 2504 struct inet6_ifaddr *ift; 2505 2506 read_lock_bh(&idev->lock); 2507 /* update all temporary addresses in the list */ 2508 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2509 int age, max_valid, max_prefered; 2510 2511 if (ifp != ift->ifpub) 2512 continue; 2513 2514 /* RFC 4941 section 3.3: 2515 * If a received option will extend the lifetime of a public 2516 * address, the lifetimes of temporary addresses should 2517 * be extended, subject to the overall constraint that no 2518 * temporary addresses should ever remain "valid" or "preferred" 2519 * for a time longer than (TEMP_VALID_LIFETIME) or 2520 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2521 */ 2522 age = (now - ift->cstamp) / HZ; 2523 max_valid = idev->cnf.temp_valid_lft - age; 2524 if (max_valid < 0) 2525 max_valid = 0; 2526 2527 max_prefered = idev->cnf.temp_prefered_lft - 2528 idev->desync_factor - age; 2529 if (max_prefered < 0) 2530 max_prefered = 0; 2531 2532 if (valid_lft > max_valid) 2533 valid_lft = max_valid; 2534 2535 if (prefered_lft > max_prefered) 2536 prefered_lft = max_prefered; 2537 2538 spin_lock(&ift->lock); 2539 flags = ift->flags; 2540 ift->valid_lft = valid_lft; 2541 ift->prefered_lft = prefered_lft; 2542 ift->tstamp = now; 2543 if (prefered_lft > 0) 2544 ift->flags &= ~IFA_F_DEPRECATED; 2545 2546 spin_unlock(&ift->lock); 2547 if (!(flags&IFA_F_TENTATIVE)) 2548 ipv6_ifa_notify(0, ift); 2549 } 2550 2551 if ((create || list_empty(&idev->tempaddr_list)) && 2552 idev->cnf.use_tempaddr > 0) { 2553 /* When a new public address is created as described 2554 * in [ADDRCONF], also create a new temporary address. 2555 * Also create a temporary address if it's enabled but 2556 * no temporary address currently exists. 2557 */ 2558 read_unlock_bh(&idev->lock); 2559 ipv6_create_tempaddr(ifp, false); 2560 } else { 2561 read_unlock_bh(&idev->lock); 2562 } 2563 } 2564 2565 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2566 { 2567 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2568 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2569 } 2570 2571 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2572 const struct prefix_info *pinfo, 2573 struct inet6_dev *in6_dev, 2574 const struct in6_addr *addr, int addr_type, 2575 u32 addr_flags, bool sllao, bool tokenized, 2576 __u32 valid_lft, u32 prefered_lft) 2577 { 2578 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2579 int create = 0; 2580 2581 if (!ifp && valid_lft) { 2582 int max_addresses = in6_dev->cnf.max_addresses; 2583 struct ifa6_config cfg = { 2584 .pfx = addr, 2585 .plen = pinfo->prefix_len, 2586 .ifa_flags = addr_flags, 2587 .valid_lft = valid_lft, 2588 .preferred_lft = prefered_lft, 2589 .scope = addr_type & IPV6_ADDR_SCOPE_MASK, 2590 }; 2591 2592 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2593 if ((net->ipv6.devconf_all->optimistic_dad || 2594 in6_dev->cnf.optimistic_dad) && 2595 !net->ipv6.devconf_all->forwarding && sllao) 2596 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 2597 #endif 2598 2599 /* Do not allow to create too much of autoconfigured 2600 * addresses; this would be too easy way to crash kernel. 2601 */ 2602 if (!max_addresses || 2603 ipv6_count_addresses(in6_dev) < max_addresses) 2604 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL); 2605 2606 if (IS_ERR_OR_NULL(ifp)) 2607 return -1; 2608 2609 create = 1; 2610 spin_lock_bh(&ifp->lock); 2611 ifp->flags |= IFA_F_MANAGETEMPADDR; 2612 ifp->cstamp = jiffies; 2613 ifp->tokenized = tokenized; 2614 spin_unlock_bh(&ifp->lock); 2615 addrconf_dad_start(ifp); 2616 } 2617 2618 if (ifp) { 2619 u32 flags; 2620 unsigned long now; 2621 u32 stored_lft; 2622 2623 /* Update lifetime (RFC4862 5.5.3 e) 2624 * We deviate from RFC4862 by honoring all Valid Lifetimes to 2625 * improve the reaction of SLAAC to renumbering events 2626 * (draft-gont-6man-slaac-renum-06, Section 4.2) 2627 */ 2628 spin_lock_bh(&ifp->lock); 2629 now = jiffies; 2630 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2631 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2632 else 2633 stored_lft = 0; 2634 2635 if (!create && stored_lft) { 2636 ifp->valid_lft = valid_lft; 2637 ifp->prefered_lft = prefered_lft; 2638 ifp->tstamp = now; 2639 flags = ifp->flags; 2640 ifp->flags &= ~IFA_F_DEPRECATED; 2641 spin_unlock_bh(&ifp->lock); 2642 2643 if (!(flags&IFA_F_TENTATIVE)) 2644 ipv6_ifa_notify(0, ifp); 2645 } else 2646 spin_unlock_bh(&ifp->lock); 2647 2648 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2649 create, now); 2650 2651 in6_ifa_put(ifp); 2652 addrconf_verify(); 2653 } 2654 2655 return 0; 2656 } 2657 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2658 2659 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2660 { 2661 struct prefix_info *pinfo; 2662 __u32 valid_lft; 2663 __u32 prefered_lft; 2664 int addr_type, err; 2665 u32 addr_flags = 0; 2666 struct inet6_dev *in6_dev; 2667 struct net *net = dev_net(dev); 2668 2669 pinfo = (struct prefix_info *) opt; 2670 2671 if (len < sizeof(struct prefix_info)) { 2672 netdev_dbg(dev, "addrconf: prefix option too short\n"); 2673 return; 2674 } 2675 2676 /* 2677 * Validation checks ([ADDRCONF], page 19) 2678 */ 2679 2680 addr_type = ipv6_addr_type(&pinfo->prefix); 2681 2682 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2683 return; 2684 2685 valid_lft = ntohl(pinfo->valid); 2686 prefered_lft = ntohl(pinfo->prefered); 2687 2688 if (prefered_lft > valid_lft) { 2689 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2690 return; 2691 } 2692 2693 in6_dev = in6_dev_get(dev); 2694 2695 if (!in6_dev) { 2696 net_dbg_ratelimited("addrconf: device %s not configured\n", 2697 dev->name); 2698 return; 2699 } 2700 2701 /* 2702 * Two things going on here: 2703 * 1) Add routes for on-link prefixes 2704 * 2) Configure prefixes with the auto flag set 2705 */ 2706 2707 if (pinfo->onlink) { 2708 struct fib6_info *rt; 2709 unsigned long rt_expires; 2710 2711 /* Avoid arithmetic overflow. Really, we could 2712 * save rt_expires in seconds, likely valid_lft, 2713 * but it would require division in fib gc, that it 2714 * not good. 2715 */ 2716 if (HZ > USER_HZ) 2717 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2718 else 2719 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2720 2721 if (addrconf_finite_timeout(rt_expires)) 2722 rt_expires *= HZ; 2723 2724 rt = addrconf_get_prefix_route(&pinfo->prefix, 2725 pinfo->prefix_len, 2726 dev, 2727 RTF_ADDRCONF | RTF_PREFIX_RT, 2728 RTF_DEFAULT, true); 2729 2730 if (rt) { 2731 /* Autoconf prefix route */ 2732 if (valid_lft == 0) { 2733 ip6_del_rt(net, rt, false); 2734 rt = NULL; 2735 } else if (addrconf_finite_timeout(rt_expires)) { 2736 /* not infinity */ 2737 fib6_set_expires(rt, jiffies + rt_expires); 2738 } else { 2739 fib6_clean_expires(rt); 2740 } 2741 } else if (valid_lft) { 2742 clock_t expires = 0; 2743 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2744 if (addrconf_finite_timeout(rt_expires)) { 2745 /* not infinity */ 2746 flags |= RTF_EXPIRES; 2747 expires = jiffies_to_clock_t(rt_expires); 2748 } 2749 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2750 0, dev, expires, flags, 2751 GFP_ATOMIC); 2752 } 2753 fib6_info_release(rt); 2754 } 2755 2756 /* Try to figure out our local address for this prefix */ 2757 2758 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2759 struct in6_addr addr; 2760 bool tokenized = false, dev_addr_generated = false; 2761 2762 if (pinfo->prefix_len == 64) { 2763 memcpy(&addr, &pinfo->prefix, 8); 2764 2765 if (!ipv6_addr_any(&in6_dev->token)) { 2766 read_lock_bh(&in6_dev->lock); 2767 memcpy(addr.s6_addr + 8, 2768 in6_dev->token.s6_addr + 8, 8); 2769 read_unlock_bh(&in6_dev->lock); 2770 tokenized = true; 2771 } else if (is_addr_mode_generate_stable(in6_dev) && 2772 !ipv6_generate_stable_address(&addr, 0, 2773 in6_dev)) { 2774 addr_flags |= IFA_F_STABLE_PRIVACY; 2775 goto ok; 2776 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2777 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2778 goto put; 2779 } else { 2780 dev_addr_generated = true; 2781 } 2782 goto ok; 2783 } 2784 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2785 pinfo->prefix_len); 2786 goto put; 2787 2788 ok: 2789 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2790 &addr, addr_type, 2791 addr_flags, sllao, 2792 tokenized, valid_lft, 2793 prefered_lft); 2794 if (err) 2795 goto put; 2796 2797 /* Ignore error case here because previous prefix add addr was 2798 * successful which will be notified. 2799 */ 2800 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2801 addr_type, addr_flags, sllao, 2802 tokenized, valid_lft, 2803 prefered_lft, 2804 dev_addr_generated); 2805 } 2806 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2807 put: 2808 in6_dev_put(in6_dev); 2809 } 2810 2811 static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev, 2812 struct in6_ifreq *ireq) 2813 { 2814 struct ip_tunnel_parm p = { }; 2815 int err; 2816 2817 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4)) 2818 return -EADDRNOTAVAIL; 2819 2820 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3]; 2821 p.iph.version = 4; 2822 p.iph.ihl = 5; 2823 p.iph.protocol = IPPROTO_IPV6; 2824 p.iph.ttl = 64; 2825 2826 if (!dev->netdev_ops->ndo_tunnel_ctl) 2827 return -EOPNOTSUPP; 2828 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL); 2829 if (err) 2830 return err; 2831 2832 dev = __dev_get_by_name(net, p.name); 2833 if (!dev) 2834 return -ENOBUFS; 2835 return dev_open(dev, NULL); 2836 } 2837 2838 /* 2839 * Set destination address. 2840 * Special case for SIT interfaces where we create a new "virtual" 2841 * device. 2842 */ 2843 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2844 { 2845 struct net_device *dev; 2846 struct in6_ifreq ireq; 2847 int err = -ENODEV; 2848 2849 if (!IS_ENABLED(CONFIG_IPV6_SIT)) 2850 return -ENODEV; 2851 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2852 return -EFAULT; 2853 2854 rtnl_lock(); 2855 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2856 if (dev && dev->type == ARPHRD_SIT) 2857 err = addrconf_set_sit_dstaddr(net, dev, &ireq); 2858 rtnl_unlock(); 2859 return err; 2860 } 2861 2862 static int ipv6_mc_config(struct sock *sk, bool join, 2863 const struct in6_addr *addr, int ifindex) 2864 { 2865 int ret; 2866 2867 ASSERT_RTNL(); 2868 2869 lock_sock(sk); 2870 if (join) 2871 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2872 else 2873 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2874 release_sock(sk); 2875 2876 return ret; 2877 } 2878 2879 /* 2880 * Manual configuration of address on an interface 2881 */ 2882 static int inet6_addr_add(struct net *net, int ifindex, 2883 struct ifa6_config *cfg, 2884 struct netlink_ext_ack *extack) 2885 { 2886 struct inet6_ifaddr *ifp; 2887 struct inet6_dev *idev; 2888 struct net_device *dev; 2889 unsigned long timeout; 2890 clock_t expires; 2891 u32 flags; 2892 2893 ASSERT_RTNL(); 2894 2895 if (cfg->plen > 128) 2896 return -EINVAL; 2897 2898 /* check the lifetime */ 2899 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 2900 return -EINVAL; 2901 2902 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) 2903 return -EINVAL; 2904 2905 dev = __dev_get_by_index(net, ifindex); 2906 if (!dev) 2907 return -ENODEV; 2908 2909 idev = addrconf_add_dev(dev); 2910 if (IS_ERR(idev)) 2911 return PTR_ERR(idev); 2912 2913 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2914 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2915 true, cfg->pfx, ifindex); 2916 2917 if (ret < 0) 2918 return ret; 2919 } 2920 2921 cfg->scope = ipv6_addr_scope(cfg->pfx); 2922 2923 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 2924 if (addrconf_finite_timeout(timeout)) { 2925 expires = jiffies_to_clock_t(timeout * HZ); 2926 cfg->valid_lft = timeout; 2927 flags = RTF_EXPIRES; 2928 } else { 2929 expires = 0; 2930 flags = 0; 2931 cfg->ifa_flags |= IFA_F_PERMANENT; 2932 } 2933 2934 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 2935 if (addrconf_finite_timeout(timeout)) { 2936 if (timeout == 0) 2937 cfg->ifa_flags |= IFA_F_DEPRECATED; 2938 cfg->preferred_lft = timeout; 2939 } 2940 2941 ifp = ipv6_add_addr(idev, cfg, true, extack); 2942 if (!IS_ERR(ifp)) { 2943 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 2944 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 2945 ifp->rt_priority, dev, expires, 2946 flags, GFP_KERNEL); 2947 } 2948 2949 /* Send a netlink notification if DAD is enabled and 2950 * optimistic flag is not set 2951 */ 2952 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD))) 2953 ipv6_ifa_notify(0, ifp); 2954 /* 2955 * Note that section 3.1 of RFC 4429 indicates 2956 * that the Optimistic flag should not be set for 2957 * manually configured addresses 2958 */ 2959 addrconf_dad_start(ifp); 2960 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR) 2961 manage_tempaddrs(idev, ifp, cfg->valid_lft, 2962 cfg->preferred_lft, true, jiffies); 2963 in6_ifa_put(ifp); 2964 addrconf_verify_rtnl(); 2965 return 0; 2966 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2967 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false, 2968 cfg->pfx, ifindex); 2969 } 2970 2971 return PTR_ERR(ifp); 2972 } 2973 2974 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2975 const struct in6_addr *pfx, unsigned int plen) 2976 { 2977 struct inet6_ifaddr *ifp; 2978 struct inet6_dev *idev; 2979 struct net_device *dev; 2980 2981 if (plen > 128) 2982 return -EINVAL; 2983 2984 dev = __dev_get_by_index(net, ifindex); 2985 if (!dev) 2986 return -ENODEV; 2987 2988 idev = __in6_dev_get(dev); 2989 if (!idev) 2990 return -ENXIO; 2991 2992 read_lock_bh(&idev->lock); 2993 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2994 if (ifp->prefix_len == plen && 2995 ipv6_addr_equal(pfx, &ifp->addr)) { 2996 in6_ifa_hold(ifp); 2997 read_unlock_bh(&idev->lock); 2998 2999 if (!(ifp->flags & IFA_F_TEMPORARY) && 3000 (ifa_flags & IFA_F_MANAGETEMPADDR)) 3001 manage_tempaddrs(idev, ifp, 0, 0, false, 3002 jiffies); 3003 ipv6_del_addr(ifp); 3004 addrconf_verify_rtnl(); 3005 if (ipv6_addr_is_multicast(pfx)) { 3006 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 3007 false, pfx, dev->ifindex); 3008 } 3009 return 0; 3010 } 3011 } 3012 read_unlock_bh(&idev->lock); 3013 return -EADDRNOTAVAIL; 3014 } 3015 3016 3017 int addrconf_add_ifaddr(struct net *net, void __user *arg) 3018 { 3019 struct ifa6_config cfg = { 3020 .ifa_flags = IFA_F_PERMANENT, 3021 .preferred_lft = INFINITY_LIFE_TIME, 3022 .valid_lft = INFINITY_LIFE_TIME, 3023 }; 3024 struct in6_ifreq ireq; 3025 int err; 3026 3027 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3028 return -EPERM; 3029 3030 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3031 return -EFAULT; 3032 3033 cfg.pfx = &ireq.ifr6_addr; 3034 cfg.plen = ireq.ifr6_prefixlen; 3035 3036 rtnl_lock(); 3037 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL); 3038 rtnl_unlock(); 3039 return err; 3040 } 3041 3042 int addrconf_del_ifaddr(struct net *net, void __user *arg) 3043 { 3044 struct in6_ifreq ireq; 3045 int err; 3046 3047 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3048 return -EPERM; 3049 3050 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3051 return -EFAULT; 3052 3053 rtnl_lock(); 3054 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 3055 ireq.ifr6_prefixlen); 3056 rtnl_unlock(); 3057 return err; 3058 } 3059 3060 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 3061 int plen, int scope) 3062 { 3063 struct inet6_ifaddr *ifp; 3064 struct ifa6_config cfg = { 3065 .pfx = addr, 3066 .plen = plen, 3067 .ifa_flags = IFA_F_PERMANENT, 3068 .valid_lft = INFINITY_LIFE_TIME, 3069 .preferred_lft = INFINITY_LIFE_TIME, 3070 .scope = scope 3071 }; 3072 3073 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3074 if (!IS_ERR(ifp)) { 3075 spin_lock_bh(&ifp->lock); 3076 ifp->flags &= ~IFA_F_TENTATIVE; 3077 spin_unlock_bh(&ifp->lock); 3078 rt_genid_bump_ipv6(dev_net(idev->dev)); 3079 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3080 in6_ifa_put(ifp); 3081 } 3082 } 3083 3084 #if IS_ENABLED(CONFIG_IPV6_SIT) 3085 static void sit_add_v4_addrs(struct inet6_dev *idev) 3086 { 3087 struct in6_addr addr; 3088 struct net_device *dev; 3089 struct net *net = dev_net(idev->dev); 3090 int scope, plen; 3091 u32 pflags = 0; 3092 3093 ASSERT_RTNL(); 3094 3095 memset(&addr, 0, sizeof(struct in6_addr)); 3096 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 3097 3098 if (idev->dev->flags&IFF_POINTOPOINT) { 3099 addr.s6_addr32[0] = htonl(0xfe800000); 3100 scope = IFA_LINK; 3101 plen = 64; 3102 } else { 3103 scope = IPV6_ADDR_COMPATv4; 3104 plen = 96; 3105 pflags |= RTF_NONEXTHOP; 3106 } 3107 3108 if (addr.s6_addr32[3]) { 3109 add_addr(idev, &addr, plen, scope); 3110 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags, 3111 GFP_KERNEL); 3112 return; 3113 } 3114 3115 for_each_netdev(net, dev) { 3116 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3117 if (in_dev && (dev->flags & IFF_UP)) { 3118 struct in_ifaddr *ifa; 3119 int flag = scope; 3120 3121 in_dev_for_each_ifa_rtnl(ifa, in_dev) { 3122 addr.s6_addr32[3] = ifa->ifa_local; 3123 3124 if (ifa->ifa_scope == RT_SCOPE_LINK) 3125 continue; 3126 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3127 if (idev->dev->flags&IFF_POINTOPOINT) 3128 continue; 3129 flag |= IFA_HOST; 3130 } 3131 3132 add_addr(idev, &addr, plen, flag); 3133 addrconf_prefix_route(&addr, plen, 0, idev->dev, 3134 0, pflags, GFP_KERNEL); 3135 } 3136 } 3137 } 3138 } 3139 #endif 3140 3141 static void init_loopback(struct net_device *dev) 3142 { 3143 struct inet6_dev *idev; 3144 3145 /* ::1 */ 3146 3147 ASSERT_RTNL(); 3148 3149 idev = ipv6_find_idev(dev); 3150 if (IS_ERR(idev)) { 3151 pr_debug("%s: add_dev failed\n", __func__); 3152 return; 3153 } 3154 3155 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 3156 } 3157 3158 void addrconf_add_linklocal(struct inet6_dev *idev, 3159 const struct in6_addr *addr, u32 flags) 3160 { 3161 struct ifa6_config cfg = { 3162 .pfx = addr, 3163 .plen = 64, 3164 .ifa_flags = flags | IFA_F_PERMANENT, 3165 .valid_lft = INFINITY_LIFE_TIME, 3166 .preferred_lft = INFINITY_LIFE_TIME, 3167 .scope = IFA_LINK 3168 }; 3169 struct inet6_ifaddr *ifp; 3170 3171 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3172 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad || 3173 idev->cnf.optimistic_dad) && 3174 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3175 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 3176 #endif 3177 3178 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3179 if (!IS_ERR(ifp)) { 3180 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev, 3181 0, 0, GFP_ATOMIC); 3182 addrconf_dad_start(ifp); 3183 in6_ifa_put(ifp); 3184 } 3185 } 3186 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3187 3188 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3189 { 3190 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3191 return true; 3192 3193 if (address.s6_addr32[2] == htonl(0x02005eff) && 3194 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3195 return true; 3196 3197 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3198 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3199 return true; 3200 3201 return false; 3202 } 3203 3204 static int ipv6_generate_stable_address(struct in6_addr *address, 3205 u8 dad_count, 3206 const struct inet6_dev *idev) 3207 { 3208 static DEFINE_SPINLOCK(lock); 3209 static __u32 digest[SHA1_DIGEST_WORDS]; 3210 static __u32 workspace[SHA1_WORKSPACE_WORDS]; 3211 3212 static union { 3213 char __data[SHA1_BLOCK_SIZE]; 3214 struct { 3215 struct in6_addr secret; 3216 __be32 prefix[2]; 3217 unsigned char hwaddr[MAX_ADDR_LEN]; 3218 u8 dad_count; 3219 } __packed; 3220 } data; 3221 3222 struct in6_addr secret; 3223 struct in6_addr temp; 3224 struct net *net = dev_net(idev->dev); 3225 3226 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3227 3228 if (idev->cnf.stable_secret.initialized) 3229 secret = idev->cnf.stable_secret.secret; 3230 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3231 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3232 else 3233 return -1; 3234 3235 retry: 3236 spin_lock_bh(&lock); 3237 3238 sha1_init(digest); 3239 memset(&data, 0, sizeof(data)); 3240 memset(workspace, 0, sizeof(workspace)); 3241 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3242 data.prefix[0] = address->s6_addr32[0]; 3243 data.prefix[1] = address->s6_addr32[1]; 3244 data.secret = secret; 3245 data.dad_count = dad_count; 3246 3247 sha1_transform(digest, data.__data, workspace); 3248 3249 temp = *address; 3250 temp.s6_addr32[2] = (__force __be32)digest[0]; 3251 temp.s6_addr32[3] = (__force __be32)digest[1]; 3252 3253 spin_unlock_bh(&lock); 3254 3255 if (ipv6_reserved_interfaceid(temp)) { 3256 dad_count++; 3257 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3258 return -1; 3259 goto retry; 3260 } 3261 3262 *address = temp; 3263 return 0; 3264 } 3265 3266 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3267 { 3268 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3269 3270 if (s->initialized) 3271 return; 3272 s = &idev->cnf.stable_secret; 3273 get_random_bytes(&s->secret, sizeof(s->secret)); 3274 s->initialized = true; 3275 } 3276 3277 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3278 { 3279 struct in6_addr addr; 3280 3281 /* no link local addresses on L3 master devices */ 3282 if (netif_is_l3_master(idev->dev)) 3283 return; 3284 3285 /* no link local addresses on devices flagged as slaves */ 3286 if (idev->dev->flags & IFF_SLAVE) 3287 return; 3288 3289 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3290 3291 switch (idev->cnf.addr_gen_mode) { 3292 case IN6_ADDR_GEN_MODE_RANDOM: 3293 ipv6_gen_mode_random_init(idev); 3294 fallthrough; 3295 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3296 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3297 addrconf_add_linklocal(idev, &addr, 3298 IFA_F_STABLE_PRIVACY); 3299 else if (prefix_route) 3300 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3301 0, 0, GFP_KERNEL); 3302 break; 3303 case IN6_ADDR_GEN_MODE_EUI64: 3304 /* addrconf_add_linklocal also adds a prefix_route and we 3305 * only need to care about prefix routes if ipv6_generate_eui64 3306 * couldn't generate one. 3307 */ 3308 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3309 addrconf_add_linklocal(idev, &addr, 0); 3310 else if (prefix_route) 3311 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3312 0, 0, GFP_KERNEL); 3313 break; 3314 case IN6_ADDR_GEN_MODE_NONE: 3315 default: 3316 /* will not add any link local address */ 3317 break; 3318 } 3319 } 3320 3321 static void addrconf_dev_config(struct net_device *dev) 3322 { 3323 struct inet6_dev *idev; 3324 3325 ASSERT_RTNL(); 3326 3327 if ((dev->type != ARPHRD_ETHER) && 3328 (dev->type != ARPHRD_FDDI) && 3329 (dev->type != ARPHRD_ARCNET) && 3330 (dev->type != ARPHRD_INFINIBAND) && 3331 (dev->type != ARPHRD_IEEE1394) && 3332 (dev->type != ARPHRD_TUNNEL6) && 3333 (dev->type != ARPHRD_6LOWPAN) && 3334 (dev->type != ARPHRD_IP6GRE) && 3335 (dev->type != ARPHRD_IPGRE) && 3336 (dev->type != ARPHRD_TUNNEL) && 3337 (dev->type != ARPHRD_NONE) && 3338 (dev->type != ARPHRD_RAWIP)) { 3339 /* Alas, we support only Ethernet autoconfiguration. */ 3340 idev = __in6_dev_get(dev); 3341 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP && 3342 dev->flags & IFF_MULTICAST) 3343 ipv6_mc_up(idev); 3344 return; 3345 } 3346 3347 idev = addrconf_add_dev(dev); 3348 if (IS_ERR(idev)) 3349 return; 3350 3351 /* this device type has no EUI support */ 3352 if (dev->type == ARPHRD_NONE && 3353 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3354 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3355 3356 addrconf_addr_gen(idev, false); 3357 } 3358 3359 #if IS_ENABLED(CONFIG_IPV6_SIT) 3360 static void addrconf_sit_config(struct net_device *dev) 3361 { 3362 struct inet6_dev *idev; 3363 3364 ASSERT_RTNL(); 3365 3366 /* 3367 * Configure the tunnel with one of our IPv4 3368 * addresses... we should configure all of 3369 * our v4 addrs in the tunnel 3370 */ 3371 3372 idev = ipv6_find_idev(dev); 3373 if (IS_ERR(idev)) { 3374 pr_debug("%s: add_dev failed\n", __func__); 3375 return; 3376 } 3377 3378 if (dev->priv_flags & IFF_ISATAP) { 3379 addrconf_addr_gen(idev, false); 3380 return; 3381 } 3382 3383 sit_add_v4_addrs(idev); 3384 3385 if (dev->flags&IFF_POINTOPOINT) 3386 addrconf_add_mroute(dev); 3387 } 3388 #endif 3389 3390 #if IS_ENABLED(CONFIG_NET_IPGRE) 3391 static void addrconf_gre_config(struct net_device *dev) 3392 { 3393 struct inet6_dev *idev; 3394 3395 ASSERT_RTNL(); 3396 3397 idev = ipv6_find_idev(dev); 3398 if (IS_ERR(idev)) { 3399 pr_debug("%s: add_dev failed\n", __func__); 3400 return; 3401 } 3402 3403 addrconf_addr_gen(idev, true); 3404 if (dev->flags & IFF_POINTOPOINT) 3405 addrconf_add_mroute(dev); 3406 } 3407 #endif 3408 3409 static int fixup_permanent_addr(struct net *net, 3410 struct inet6_dev *idev, 3411 struct inet6_ifaddr *ifp) 3412 { 3413 /* !fib6_node means the host route was removed from the 3414 * FIB, for example, if 'lo' device is taken down. In that 3415 * case regenerate the host route. 3416 */ 3417 if (!ifp->rt || !ifp->rt->fib6_node) { 3418 struct fib6_info *f6i, *prev; 3419 3420 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false, 3421 GFP_ATOMIC); 3422 if (IS_ERR(f6i)) 3423 return PTR_ERR(f6i); 3424 3425 /* ifp->rt can be accessed outside of rtnl */ 3426 spin_lock(&ifp->lock); 3427 prev = ifp->rt; 3428 ifp->rt = f6i; 3429 spin_unlock(&ifp->lock); 3430 3431 fib6_info_release(prev); 3432 } 3433 3434 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3435 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3436 ifp->rt_priority, idev->dev, 0, 0, 3437 GFP_ATOMIC); 3438 } 3439 3440 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3441 addrconf_dad_start(ifp); 3442 3443 return 0; 3444 } 3445 3446 static void addrconf_permanent_addr(struct net *net, struct net_device *dev) 3447 { 3448 struct inet6_ifaddr *ifp, *tmp; 3449 struct inet6_dev *idev; 3450 3451 idev = __in6_dev_get(dev); 3452 if (!idev) 3453 return; 3454 3455 write_lock_bh(&idev->lock); 3456 3457 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3458 if ((ifp->flags & IFA_F_PERMANENT) && 3459 fixup_permanent_addr(net, idev, ifp) < 0) { 3460 write_unlock_bh(&idev->lock); 3461 in6_ifa_hold(ifp); 3462 ipv6_del_addr(ifp); 3463 write_lock_bh(&idev->lock); 3464 3465 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3466 idev->dev->name, &ifp->addr); 3467 } 3468 } 3469 3470 write_unlock_bh(&idev->lock); 3471 } 3472 3473 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3474 void *ptr) 3475 { 3476 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3477 struct netdev_notifier_change_info *change_info; 3478 struct netdev_notifier_changeupper_info *info; 3479 struct inet6_dev *idev = __in6_dev_get(dev); 3480 struct net *net = dev_net(dev); 3481 int run_pending = 0; 3482 int err; 3483 3484 switch (event) { 3485 case NETDEV_REGISTER: 3486 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3487 idev = ipv6_add_dev(dev); 3488 if (IS_ERR(idev)) 3489 return notifier_from_errno(PTR_ERR(idev)); 3490 } 3491 break; 3492 3493 case NETDEV_CHANGEMTU: 3494 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3495 if (dev->mtu < IPV6_MIN_MTU) { 3496 addrconf_ifdown(dev, dev != net->loopback_dev); 3497 break; 3498 } 3499 3500 if (idev) { 3501 rt6_mtu_change(dev, dev->mtu); 3502 idev->cnf.mtu6 = dev->mtu; 3503 break; 3504 } 3505 3506 /* allocate new idev */ 3507 idev = ipv6_add_dev(dev); 3508 if (IS_ERR(idev)) 3509 break; 3510 3511 /* device is still not ready */ 3512 if (!(idev->if_flags & IF_READY)) 3513 break; 3514 3515 run_pending = 1; 3516 fallthrough; 3517 case NETDEV_UP: 3518 case NETDEV_CHANGE: 3519 if (dev->flags & IFF_SLAVE) 3520 break; 3521 3522 if (idev && idev->cnf.disable_ipv6) 3523 break; 3524 3525 if (event == NETDEV_UP) { 3526 /* restore routes for permanent addresses */ 3527 addrconf_permanent_addr(net, dev); 3528 3529 if (!addrconf_link_ready(dev)) { 3530 /* device is not ready yet. */ 3531 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3532 dev->name); 3533 break; 3534 } 3535 3536 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3537 idev = ipv6_add_dev(dev); 3538 3539 if (!IS_ERR_OR_NULL(idev)) { 3540 idev->if_flags |= IF_READY; 3541 run_pending = 1; 3542 } 3543 } else if (event == NETDEV_CHANGE) { 3544 if (!addrconf_link_ready(dev)) { 3545 /* device is still not ready. */ 3546 rt6_sync_down_dev(dev, event); 3547 break; 3548 } 3549 3550 if (!IS_ERR_OR_NULL(idev)) { 3551 if (idev->if_flags & IF_READY) { 3552 /* device is already configured - 3553 * but resend MLD reports, we might 3554 * have roamed and need to update 3555 * multicast snooping switches 3556 */ 3557 ipv6_mc_up(idev); 3558 change_info = ptr; 3559 if (change_info->flags_changed & IFF_NOARP) 3560 addrconf_dad_run(idev, true); 3561 rt6_sync_up(dev, RTNH_F_LINKDOWN); 3562 break; 3563 } 3564 idev->if_flags |= IF_READY; 3565 } 3566 3567 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3568 dev->name); 3569 3570 run_pending = 1; 3571 } 3572 3573 switch (dev->type) { 3574 #if IS_ENABLED(CONFIG_IPV6_SIT) 3575 case ARPHRD_SIT: 3576 addrconf_sit_config(dev); 3577 break; 3578 #endif 3579 #if IS_ENABLED(CONFIG_NET_IPGRE) 3580 case ARPHRD_IPGRE: 3581 addrconf_gre_config(dev); 3582 break; 3583 #endif 3584 case ARPHRD_LOOPBACK: 3585 init_loopback(dev); 3586 break; 3587 3588 default: 3589 addrconf_dev_config(dev); 3590 break; 3591 } 3592 3593 if (!IS_ERR_OR_NULL(idev)) { 3594 if (run_pending) 3595 addrconf_dad_run(idev, false); 3596 3597 /* Device has an address by now */ 3598 rt6_sync_up(dev, RTNH_F_DEAD); 3599 3600 /* 3601 * If the MTU changed during the interface down, 3602 * when the interface up, the changed MTU must be 3603 * reflected in the idev as well as routers. 3604 */ 3605 if (idev->cnf.mtu6 != dev->mtu && 3606 dev->mtu >= IPV6_MIN_MTU) { 3607 rt6_mtu_change(dev, dev->mtu); 3608 idev->cnf.mtu6 = dev->mtu; 3609 } 3610 idev->tstamp = jiffies; 3611 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3612 3613 /* 3614 * If the changed mtu during down is lower than 3615 * IPV6_MIN_MTU stop IPv6 on this interface. 3616 */ 3617 if (dev->mtu < IPV6_MIN_MTU) 3618 addrconf_ifdown(dev, dev != net->loopback_dev); 3619 } 3620 break; 3621 3622 case NETDEV_DOWN: 3623 case NETDEV_UNREGISTER: 3624 /* 3625 * Remove all addresses from this interface. 3626 */ 3627 addrconf_ifdown(dev, event != NETDEV_DOWN); 3628 break; 3629 3630 case NETDEV_CHANGENAME: 3631 if (idev) { 3632 snmp6_unregister_dev(idev); 3633 addrconf_sysctl_unregister(idev); 3634 err = addrconf_sysctl_register(idev); 3635 if (err) 3636 return notifier_from_errno(err); 3637 err = snmp6_register_dev(idev); 3638 if (err) { 3639 addrconf_sysctl_unregister(idev); 3640 return notifier_from_errno(err); 3641 } 3642 } 3643 break; 3644 3645 case NETDEV_PRE_TYPE_CHANGE: 3646 case NETDEV_POST_TYPE_CHANGE: 3647 if (idev) 3648 addrconf_type_change(dev, event); 3649 break; 3650 3651 case NETDEV_CHANGEUPPER: 3652 info = ptr; 3653 3654 /* flush all routes if dev is linked to or unlinked from 3655 * an L3 master device (e.g., VRF) 3656 */ 3657 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3658 addrconf_ifdown(dev, false); 3659 } 3660 3661 return NOTIFY_OK; 3662 } 3663 3664 /* 3665 * addrconf module should be notified of a device going up 3666 */ 3667 static struct notifier_block ipv6_dev_notf = { 3668 .notifier_call = addrconf_notify, 3669 .priority = ADDRCONF_NOTIFY_PRIORITY, 3670 }; 3671 3672 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3673 { 3674 struct inet6_dev *idev; 3675 ASSERT_RTNL(); 3676 3677 idev = __in6_dev_get(dev); 3678 3679 if (event == NETDEV_POST_TYPE_CHANGE) 3680 ipv6_mc_remap(idev); 3681 else if (event == NETDEV_PRE_TYPE_CHANGE) 3682 ipv6_mc_unmap(idev); 3683 } 3684 3685 static bool addr_is_local(const struct in6_addr *addr) 3686 { 3687 return ipv6_addr_type(addr) & 3688 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3689 } 3690 3691 static int addrconf_ifdown(struct net_device *dev, bool unregister) 3692 { 3693 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN; 3694 struct net *net = dev_net(dev); 3695 struct inet6_dev *idev; 3696 struct inet6_ifaddr *ifa, *tmp; 3697 bool keep_addr = false; 3698 int state, i; 3699 3700 ASSERT_RTNL(); 3701 3702 rt6_disable_ip(dev, event); 3703 3704 idev = __in6_dev_get(dev); 3705 if (!idev) 3706 return -ENODEV; 3707 3708 /* 3709 * Step 1: remove reference to ipv6 device from parent device. 3710 * Do not dev_put! 3711 */ 3712 if (unregister) { 3713 idev->dead = 1; 3714 3715 /* protected by rtnl_lock */ 3716 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3717 3718 /* Step 1.5: remove snmp6 entry */ 3719 snmp6_unregister_dev(idev); 3720 3721 } 3722 3723 /* combine the user config with event to determine if permanent 3724 * addresses are to be removed from address hash table 3725 */ 3726 if (!unregister && !idev->cnf.disable_ipv6) { 3727 /* aggregate the system setting and interface setting */ 3728 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3729 3730 if (!_keep_addr) 3731 _keep_addr = idev->cnf.keep_addr_on_down; 3732 3733 keep_addr = (_keep_addr > 0); 3734 } 3735 3736 /* Step 2: clear hash table */ 3737 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3738 struct hlist_head *h = &inet6_addr_lst[i]; 3739 3740 spin_lock_bh(&addrconf_hash_lock); 3741 restart: 3742 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3743 if (ifa->idev == idev) { 3744 addrconf_del_dad_work(ifa); 3745 /* combined flag + permanent flag decide if 3746 * address is retained on a down event 3747 */ 3748 if (!keep_addr || 3749 !(ifa->flags & IFA_F_PERMANENT) || 3750 addr_is_local(&ifa->addr)) { 3751 hlist_del_init_rcu(&ifa->addr_lst); 3752 goto restart; 3753 } 3754 } 3755 } 3756 spin_unlock_bh(&addrconf_hash_lock); 3757 } 3758 3759 write_lock_bh(&idev->lock); 3760 3761 addrconf_del_rs_timer(idev); 3762 3763 /* Step 2: clear flags for stateless addrconf */ 3764 if (!unregister) 3765 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3766 3767 /* Step 3: clear tempaddr list */ 3768 while (!list_empty(&idev->tempaddr_list)) { 3769 ifa = list_first_entry(&idev->tempaddr_list, 3770 struct inet6_ifaddr, tmp_list); 3771 list_del(&ifa->tmp_list); 3772 write_unlock_bh(&idev->lock); 3773 spin_lock_bh(&ifa->lock); 3774 3775 if (ifa->ifpub) { 3776 in6_ifa_put(ifa->ifpub); 3777 ifa->ifpub = NULL; 3778 } 3779 spin_unlock_bh(&ifa->lock); 3780 in6_ifa_put(ifa); 3781 write_lock_bh(&idev->lock); 3782 } 3783 3784 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3785 struct fib6_info *rt = NULL; 3786 bool keep; 3787 3788 addrconf_del_dad_work(ifa); 3789 3790 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3791 !addr_is_local(&ifa->addr); 3792 3793 write_unlock_bh(&idev->lock); 3794 spin_lock_bh(&ifa->lock); 3795 3796 if (keep) { 3797 /* set state to skip the notifier below */ 3798 state = INET6_IFADDR_STATE_DEAD; 3799 ifa->state = INET6_IFADDR_STATE_PREDAD; 3800 if (!(ifa->flags & IFA_F_NODAD)) 3801 ifa->flags |= IFA_F_TENTATIVE; 3802 3803 rt = ifa->rt; 3804 ifa->rt = NULL; 3805 } else { 3806 state = ifa->state; 3807 ifa->state = INET6_IFADDR_STATE_DEAD; 3808 } 3809 3810 spin_unlock_bh(&ifa->lock); 3811 3812 if (rt) 3813 ip6_del_rt(net, rt, false); 3814 3815 if (state != INET6_IFADDR_STATE_DEAD) { 3816 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3817 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3818 } else { 3819 if (idev->cnf.forwarding) 3820 addrconf_leave_anycast(ifa); 3821 addrconf_leave_solict(ifa->idev, &ifa->addr); 3822 } 3823 3824 write_lock_bh(&idev->lock); 3825 if (!keep) { 3826 list_del_rcu(&ifa->if_list); 3827 in6_ifa_put(ifa); 3828 } 3829 } 3830 3831 write_unlock_bh(&idev->lock); 3832 3833 /* Step 5: Discard anycast and multicast list */ 3834 if (unregister) { 3835 ipv6_ac_destroy_dev(idev); 3836 ipv6_mc_destroy_dev(idev); 3837 } else { 3838 ipv6_mc_down(idev); 3839 } 3840 3841 idev->tstamp = jiffies; 3842 3843 /* Last: Shot the device (if unregistered) */ 3844 if (unregister) { 3845 addrconf_sysctl_unregister(idev); 3846 neigh_parms_release(&nd_tbl, idev->nd_parms); 3847 neigh_ifdown(&nd_tbl, dev); 3848 in6_dev_put(idev); 3849 } 3850 return 0; 3851 } 3852 3853 static void addrconf_rs_timer(struct timer_list *t) 3854 { 3855 struct inet6_dev *idev = from_timer(idev, t, rs_timer); 3856 struct net_device *dev = idev->dev; 3857 struct in6_addr lladdr; 3858 3859 write_lock(&idev->lock); 3860 if (idev->dead || !(idev->if_flags & IF_READY)) 3861 goto out; 3862 3863 if (!ipv6_accept_ra(idev)) 3864 goto out; 3865 3866 /* Announcement received after solicitation was sent */ 3867 if (idev->if_flags & IF_RA_RCVD) 3868 goto out; 3869 3870 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3871 write_unlock(&idev->lock); 3872 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3873 ndisc_send_rs(dev, &lladdr, 3874 &in6addr_linklocal_allrouters); 3875 else 3876 goto put; 3877 3878 write_lock(&idev->lock); 3879 idev->rs_interval = rfc3315_s14_backoff_update( 3880 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3881 /* The wait after the last probe can be shorter */ 3882 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3883 idev->cnf.rtr_solicits) ? 3884 idev->cnf.rtr_solicit_delay : 3885 idev->rs_interval); 3886 } else { 3887 /* 3888 * Note: we do not support deprecated "all on-link" 3889 * assumption any longer. 3890 */ 3891 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3892 } 3893 3894 out: 3895 write_unlock(&idev->lock); 3896 put: 3897 in6_dev_put(idev); 3898 } 3899 3900 /* 3901 * Duplicate Address Detection 3902 */ 3903 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3904 { 3905 unsigned long rand_num; 3906 struct inet6_dev *idev = ifp->idev; 3907 u64 nonce; 3908 3909 if (ifp->flags & IFA_F_OPTIMISTIC) 3910 rand_num = 0; 3911 else 3912 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3913 3914 nonce = 0; 3915 if (idev->cnf.enhanced_dad || 3916 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 3917 do 3918 get_random_bytes(&nonce, 6); 3919 while (nonce == 0); 3920 } 3921 ifp->dad_nonce = nonce; 3922 ifp->dad_probes = idev->cnf.dad_transmits; 3923 addrconf_mod_dad_work(ifp, rand_num); 3924 } 3925 3926 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3927 { 3928 struct inet6_dev *idev = ifp->idev; 3929 struct net_device *dev = idev->dev; 3930 bool bump_id, notify = false; 3931 struct net *net; 3932 3933 addrconf_join_solict(dev, &ifp->addr); 3934 3935 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3936 3937 read_lock_bh(&idev->lock); 3938 spin_lock(&ifp->lock); 3939 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3940 goto out; 3941 3942 net = dev_net(dev); 3943 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3944 (net->ipv6.devconf_all->accept_dad < 1 && 3945 idev->cnf.accept_dad < 1) || 3946 !(ifp->flags&IFA_F_TENTATIVE) || 3947 ifp->flags & IFA_F_NODAD) { 3948 bool send_na = false; 3949 3950 if (ifp->flags & IFA_F_TENTATIVE && 3951 !(ifp->flags & IFA_F_OPTIMISTIC)) 3952 send_na = true; 3953 bump_id = ifp->flags & IFA_F_TENTATIVE; 3954 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3955 spin_unlock(&ifp->lock); 3956 read_unlock_bh(&idev->lock); 3957 3958 addrconf_dad_completed(ifp, bump_id, send_na); 3959 return; 3960 } 3961 3962 if (!(idev->if_flags & IF_READY)) { 3963 spin_unlock(&ifp->lock); 3964 read_unlock_bh(&idev->lock); 3965 /* 3966 * If the device is not ready: 3967 * - keep it tentative if it is a permanent address. 3968 * - otherwise, kill it. 3969 */ 3970 in6_ifa_hold(ifp); 3971 addrconf_dad_stop(ifp, 0); 3972 return; 3973 } 3974 3975 /* 3976 * Optimistic nodes can start receiving 3977 * Frames right away 3978 */ 3979 if (ifp->flags & IFA_F_OPTIMISTIC) { 3980 ip6_ins_rt(net, ifp->rt); 3981 if (ipv6_use_optimistic_addr(net, idev)) { 3982 /* Because optimistic nodes can use this address, 3983 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3984 */ 3985 notify = true; 3986 } 3987 } 3988 3989 addrconf_dad_kick(ifp); 3990 out: 3991 spin_unlock(&ifp->lock); 3992 read_unlock_bh(&idev->lock); 3993 if (notify) 3994 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3995 } 3996 3997 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3998 { 3999 bool begin_dad = false; 4000 4001 spin_lock_bh(&ifp->lock); 4002 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 4003 ifp->state = INET6_IFADDR_STATE_PREDAD; 4004 begin_dad = true; 4005 } 4006 spin_unlock_bh(&ifp->lock); 4007 4008 if (begin_dad) 4009 addrconf_mod_dad_work(ifp, 0); 4010 } 4011 4012 static void addrconf_dad_work(struct work_struct *w) 4013 { 4014 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 4015 struct inet6_ifaddr, 4016 dad_work); 4017 struct inet6_dev *idev = ifp->idev; 4018 bool bump_id, disable_ipv6 = false; 4019 struct in6_addr mcaddr; 4020 4021 enum { 4022 DAD_PROCESS, 4023 DAD_BEGIN, 4024 DAD_ABORT, 4025 } action = DAD_PROCESS; 4026 4027 rtnl_lock(); 4028 4029 spin_lock_bh(&ifp->lock); 4030 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 4031 action = DAD_BEGIN; 4032 ifp->state = INET6_IFADDR_STATE_DAD; 4033 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 4034 action = DAD_ABORT; 4035 ifp->state = INET6_IFADDR_STATE_POSTDAD; 4036 4037 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 || 4038 idev->cnf.accept_dad > 1) && 4039 !idev->cnf.disable_ipv6 && 4040 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 4041 struct in6_addr addr; 4042 4043 addr.s6_addr32[0] = htonl(0xfe800000); 4044 addr.s6_addr32[1] = 0; 4045 4046 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 4047 ipv6_addr_equal(&ifp->addr, &addr)) { 4048 /* DAD failed for link-local based on MAC */ 4049 idev->cnf.disable_ipv6 = 1; 4050 4051 pr_info("%s: IPv6 being disabled!\n", 4052 ifp->idev->dev->name); 4053 disable_ipv6 = true; 4054 } 4055 } 4056 } 4057 spin_unlock_bh(&ifp->lock); 4058 4059 if (action == DAD_BEGIN) { 4060 addrconf_dad_begin(ifp); 4061 goto out; 4062 } else if (action == DAD_ABORT) { 4063 in6_ifa_hold(ifp); 4064 addrconf_dad_stop(ifp, 1); 4065 if (disable_ipv6) 4066 addrconf_ifdown(idev->dev, false); 4067 goto out; 4068 } 4069 4070 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 4071 goto out; 4072 4073 write_lock_bh(&idev->lock); 4074 if (idev->dead || !(idev->if_flags & IF_READY)) { 4075 write_unlock_bh(&idev->lock); 4076 goto out; 4077 } 4078 4079 spin_lock(&ifp->lock); 4080 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 4081 spin_unlock(&ifp->lock); 4082 write_unlock_bh(&idev->lock); 4083 goto out; 4084 } 4085 4086 if (ifp->dad_probes == 0) { 4087 bool send_na = false; 4088 4089 /* 4090 * DAD was successful 4091 */ 4092 4093 if (ifp->flags & IFA_F_TENTATIVE && 4094 !(ifp->flags & IFA_F_OPTIMISTIC)) 4095 send_na = true; 4096 bump_id = ifp->flags & IFA_F_TENTATIVE; 4097 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4098 spin_unlock(&ifp->lock); 4099 write_unlock_bh(&idev->lock); 4100 4101 addrconf_dad_completed(ifp, bump_id, send_na); 4102 4103 goto out; 4104 } 4105 4106 ifp->dad_probes--; 4107 addrconf_mod_dad_work(ifp, 4108 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), 4109 HZ/100)); 4110 spin_unlock(&ifp->lock); 4111 write_unlock_bh(&idev->lock); 4112 4113 /* send a neighbour solicitation for our addr */ 4114 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 4115 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 4116 ifp->dad_nonce); 4117 out: 4118 in6_ifa_put(ifp); 4119 rtnl_unlock(); 4120 } 4121 4122 /* ifp->idev must be at least read locked */ 4123 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4124 { 4125 struct inet6_ifaddr *ifpiter; 4126 struct inet6_dev *idev = ifp->idev; 4127 4128 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4129 if (ifpiter->scope > IFA_LINK) 4130 break; 4131 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4132 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4133 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4134 IFA_F_PERMANENT) 4135 return false; 4136 } 4137 return true; 4138 } 4139 4140 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 4141 bool send_na) 4142 { 4143 struct net_device *dev = ifp->idev->dev; 4144 struct in6_addr lladdr; 4145 bool send_rs, send_mld; 4146 4147 addrconf_del_dad_work(ifp); 4148 4149 /* 4150 * Configure the address for reception. Now it is valid. 4151 */ 4152 4153 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4154 4155 /* If added prefix is link local and we are prepared to process 4156 router advertisements, start sending router solicitations. 4157 */ 4158 4159 read_lock_bh(&ifp->idev->lock); 4160 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4161 send_rs = send_mld && 4162 ipv6_accept_ra(ifp->idev) && 4163 ifp->idev->cnf.rtr_solicits != 0 && 4164 (dev->flags&IFF_LOOPBACK) == 0; 4165 read_unlock_bh(&ifp->idev->lock); 4166 4167 /* While dad is in progress mld report's source address is in6_addrany. 4168 * Resend with proper ll now. 4169 */ 4170 if (send_mld) 4171 ipv6_mc_dad_complete(ifp->idev); 4172 4173 /* send unsolicited NA if enabled */ 4174 if (send_na && 4175 (ifp->idev->cnf.ndisc_notify || 4176 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) { 4177 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr, 4178 /*router=*/ !!ifp->idev->cnf.forwarding, 4179 /*solicited=*/ false, /*override=*/ true, 4180 /*inc_opt=*/ true); 4181 } 4182 4183 if (send_rs) { 4184 /* 4185 * If a host as already performed a random delay 4186 * [...] as part of DAD [...] there is no need 4187 * to delay again before sending the first RS 4188 */ 4189 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4190 return; 4191 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4192 4193 write_lock_bh(&ifp->idev->lock); 4194 spin_lock(&ifp->lock); 4195 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4196 ifp->idev->cnf.rtr_solicit_interval); 4197 ifp->idev->rs_probes = 1; 4198 ifp->idev->if_flags |= IF_RS_SENT; 4199 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4200 spin_unlock(&ifp->lock); 4201 write_unlock_bh(&ifp->idev->lock); 4202 } 4203 4204 if (bump_id) 4205 rt_genid_bump_ipv6(dev_net(dev)); 4206 4207 /* Make sure that a new temporary address will be created 4208 * before this temporary address becomes deprecated. 4209 */ 4210 if (ifp->flags & IFA_F_TEMPORARY) 4211 addrconf_verify_rtnl(); 4212 } 4213 4214 static void addrconf_dad_run(struct inet6_dev *idev, bool restart) 4215 { 4216 struct inet6_ifaddr *ifp; 4217 4218 read_lock_bh(&idev->lock); 4219 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4220 spin_lock(&ifp->lock); 4221 if ((ifp->flags & IFA_F_TENTATIVE && 4222 ifp->state == INET6_IFADDR_STATE_DAD) || restart) { 4223 if (restart) 4224 ifp->state = INET6_IFADDR_STATE_PREDAD; 4225 addrconf_dad_kick(ifp); 4226 } 4227 spin_unlock(&ifp->lock); 4228 } 4229 read_unlock_bh(&idev->lock); 4230 } 4231 4232 #ifdef CONFIG_PROC_FS 4233 struct if6_iter_state { 4234 struct seq_net_private p; 4235 int bucket; 4236 int offset; 4237 }; 4238 4239 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4240 { 4241 struct if6_iter_state *state = seq->private; 4242 struct net *net = seq_file_net(seq); 4243 struct inet6_ifaddr *ifa = NULL; 4244 int p = 0; 4245 4246 /* initial bucket if pos is 0 */ 4247 if (pos == 0) { 4248 state->bucket = 0; 4249 state->offset = 0; 4250 } 4251 4252 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4253 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket], 4254 addr_lst) { 4255 if (!net_eq(dev_net(ifa->idev->dev), net)) 4256 continue; 4257 /* sync with offset */ 4258 if (p < state->offset) { 4259 p++; 4260 continue; 4261 } 4262 return ifa; 4263 } 4264 4265 /* prepare for next bucket */ 4266 state->offset = 0; 4267 p = 0; 4268 } 4269 return NULL; 4270 } 4271 4272 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4273 struct inet6_ifaddr *ifa) 4274 { 4275 struct if6_iter_state *state = seq->private; 4276 struct net *net = seq_file_net(seq); 4277 4278 hlist_for_each_entry_continue_rcu(ifa, addr_lst) { 4279 if (!net_eq(dev_net(ifa->idev->dev), net)) 4280 continue; 4281 state->offset++; 4282 return ifa; 4283 } 4284 4285 state->offset = 0; 4286 while (++state->bucket < IN6_ADDR_HSIZE) { 4287 hlist_for_each_entry_rcu(ifa, 4288 &inet6_addr_lst[state->bucket], addr_lst) { 4289 if (!net_eq(dev_net(ifa->idev->dev), net)) 4290 continue; 4291 return ifa; 4292 } 4293 } 4294 4295 return NULL; 4296 } 4297 4298 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4299 __acquires(rcu) 4300 { 4301 rcu_read_lock(); 4302 return if6_get_first(seq, *pos); 4303 } 4304 4305 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4306 { 4307 struct inet6_ifaddr *ifa; 4308 4309 ifa = if6_get_next(seq, v); 4310 ++*pos; 4311 return ifa; 4312 } 4313 4314 static void if6_seq_stop(struct seq_file *seq, void *v) 4315 __releases(rcu) 4316 { 4317 rcu_read_unlock(); 4318 } 4319 4320 static int if6_seq_show(struct seq_file *seq, void *v) 4321 { 4322 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4323 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4324 &ifp->addr, 4325 ifp->idev->dev->ifindex, 4326 ifp->prefix_len, 4327 ifp->scope, 4328 (u8) ifp->flags, 4329 ifp->idev->dev->name); 4330 return 0; 4331 } 4332 4333 static const struct seq_operations if6_seq_ops = { 4334 .start = if6_seq_start, 4335 .next = if6_seq_next, 4336 .show = if6_seq_show, 4337 .stop = if6_seq_stop, 4338 }; 4339 4340 static int __net_init if6_proc_net_init(struct net *net) 4341 { 4342 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops, 4343 sizeof(struct if6_iter_state))) 4344 return -ENOMEM; 4345 return 0; 4346 } 4347 4348 static void __net_exit if6_proc_net_exit(struct net *net) 4349 { 4350 remove_proc_entry("if_inet6", net->proc_net); 4351 } 4352 4353 static struct pernet_operations if6_proc_net_ops = { 4354 .init = if6_proc_net_init, 4355 .exit = if6_proc_net_exit, 4356 }; 4357 4358 int __init if6_proc_init(void) 4359 { 4360 return register_pernet_subsys(&if6_proc_net_ops); 4361 } 4362 4363 void if6_proc_exit(void) 4364 { 4365 unregister_pernet_subsys(&if6_proc_net_ops); 4366 } 4367 #endif /* CONFIG_PROC_FS */ 4368 4369 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4370 /* Check if address is a home address configured on any interface. */ 4371 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4372 { 4373 unsigned int hash = inet6_addr_hash(net, addr); 4374 struct inet6_ifaddr *ifp = NULL; 4375 int ret = 0; 4376 4377 rcu_read_lock(); 4378 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 4379 if (!net_eq(dev_net(ifp->idev->dev), net)) 4380 continue; 4381 if (ipv6_addr_equal(&ifp->addr, addr) && 4382 (ifp->flags & IFA_F_HOMEADDRESS)) { 4383 ret = 1; 4384 break; 4385 } 4386 } 4387 rcu_read_unlock(); 4388 return ret; 4389 } 4390 #endif 4391 4392 /* RFC6554 has some algorithm to avoid loops in segment routing by 4393 * checking if the segments contains any of a local interface address. 4394 * 4395 * Quote: 4396 * 4397 * To detect loops in the SRH, a router MUST determine if the SRH 4398 * includes multiple addresses assigned to any interface on that router. 4399 * If such addresses appear more than once and are separated by at least 4400 * one address not assigned to that router. 4401 */ 4402 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs, 4403 unsigned char nsegs) 4404 { 4405 const struct in6_addr *addr; 4406 int i, ret = 0, found = 0; 4407 struct inet6_ifaddr *ifp; 4408 bool separated = false; 4409 unsigned int hash; 4410 bool hash_found; 4411 4412 rcu_read_lock(); 4413 for (i = 0; i < nsegs; i++) { 4414 addr = &segs[i]; 4415 hash = inet6_addr_hash(net, addr); 4416 4417 hash_found = false; 4418 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 4419 if (!net_eq(dev_net(ifp->idev->dev), net)) 4420 continue; 4421 4422 if (ipv6_addr_equal(&ifp->addr, addr)) { 4423 hash_found = true; 4424 break; 4425 } 4426 } 4427 4428 if (hash_found) { 4429 if (found > 1 && separated) { 4430 ret = 1; 4431 break; 4432 } 4433 4434 separated = false; 4435 found++; 4436 } else { 4437 separated = true; 4438 } 4439 } 4440 rcu_read_unlock(); 4441 4442 return ret; 4443 } 4444 4445 /* 4446 * Periodic address status verification 4447 */ 4448 4449 static void addrconf_verify_rtnl(void) 4450 { 4451 unsigned long now, next, next_sec, next_sched; 4452 struct inet6_ifaddr *ifp; 4453 int i; 4454 4455 ASSERT_RTNL(); 4456 4457 rcu_read_lock_bh(); 4458 now = jiffies; 4459 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4460 4461 cancel_delayed_work(&addr_chk_work); 4462 4463 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4464 restart: 4465 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4466 unsigned long age; 4467 4468 /* When setting preferred_lft to a value not zero or 4469 * infinity, while valid_lft is infinity 4470 * IFA_F_PERMANENT has a non-infinity life time. 4471 */ 4472 if ((ifp->flags & IFA_F_PERMANENT) && 4473 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4474 continue; 4475 4476 spin_lock(&ifp->lock); 4477 /* We try to batch several events at once. */ 4478 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4479 4480 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4481 age >= ifp->valid_lft) { 4482 spin_unlock(&ifp->lock); 4483 in6_ifa_hold(ifp); 4484 ipv6_del_addr(ifp); 4485 goto restart; 4486 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4487 spin_unlock(&ifp->lock); 4488 continue; 4489 } else if (age >= ifp->prefered_lft) { 4490 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4491 int deprecate = 0; 4492 4493 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4494 deprecate = 1; 4495 ifp->flags |= IFA_F_DEPRECATED; 4496 } 4497 4498 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4499 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4500 next = ifp->tstamp + ifp->valid_lft * HZ; 4501 4502 spin_unlock(&ifp->lock); 4503 4504 if (deprecate) { 4505 in6_ifa_hold(ifp); 4506 4507 ipv6_ifa_notify(0, ifp); 4508 in6_ifa_put(ifp); 4509 goto restart; 4510 } 4511 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4512 !(ifp->flags&IFA_F_TENTATIVE)) { 4513 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4514 ifp->idev->cnf.dad_transmits * 4515 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 4516 4517 if (age >= ifp->prefered_lft - regen_advance) { 4518 struct inet6_ifaddr *ifpub = ifp->ifpub; 4519 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4520 next = ifp->tstamp + ifp->prefered_lft * HZ; 4521 if (!ifp->regen_count && ifpub) { 4522 ifp->regen_count++; 4523 in6_ifa_hold(ifp); 4524 in6_ifa_hold(ifpub); 4525 spin_unlock(&ifp->lock); 4526 4527 spin_lock(&ifpub->lock); 4528 ifpub->regen_count = 0; 4529 spin_unlock(&ifpub->lock); 4530 rcu_read_unlock_bh(); 4531 ipv6_create_tempaddr(ifpub, true); 4532 in6_ifa_put(ifpub); 4533 in6_ifa_put(ifp); 4534 rcu_read_lock_bh(); 4535 goto restart; 4536 } 4537 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4538 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4539 spin_unlock(&ifp->lock); 4540 } else { 4541 /* ifp->prefered_lft <= ifp->valid_lft */ 4542 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4543 next = ifp->tstamp + ifp->prefered_lft * HZ; 4544 spin_unlock(&ifp->lock); 4545 } 4546 } 4547 } 4548 4549 next_sec = round_jiffies_up(next); 4550 next_sched = next; 4551 4552 /* If rounded timeout is accurate enough, accept it. */ 4553 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4554 next_sched = next_sec; 4555 4556 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4557 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4558 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4559 4560 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4561 now, next, next_sec, next_sched); 4562 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4563 rcu_read_unlock_bh(); 4564 } 4565 4566 static void addrconf_verify_work(struct work_struct *w) 4567 { 4568 rtnl_lock(); 4569 addrconf_verify_rtnl(); 4570 rtnl_unlock(); 4571 } 4572 4573 static void addrconf_verify(void) 4574 { 4575 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4576 } 4577 4578 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4579 struct in6_addr **peer_pfx) 4580 { 4581 struct in6_addr *pfx = NULL; 4582 4583 *peer_pfx = NULL; 4584 4585 if (addr) 4586 pfx = nla_data(addr); 4587 4588 if (local) { 4589 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4590 *peer_pfx = pfx; 4591 pfx = nla_data(local); 4592 } 4593 4594 return pfx; 4595 } 4596 4597 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4598 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4599 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4600 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4601 [IFA_FLAGS] = { .len = sizeof(u32) }, 4602 [IFA_RT_PRIORITY] = { .len = sizeof(u32) }, 4603 [IFA_TARGET_NETNSID] = { .type = NLA_S32 }, 4604 }; 4605 4606 static int 4607 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4608 struct netlink_ext_ack *extack) 4609 { 4610 struct net *net = sock_net(skb->sk); 4611 struct ifaddrmsg *ifm; 4612 struct nlattr *tb[IFA_MAX+1]; 4613 struct in6_addr *pfx, *peer_pfx; 4614 u32 ifa_flags; 4615 int err; 4616 4617 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4618 ifa_ipv6_policy, extack); 4619 if (err < 0) 4620 return err; 4621 4622 ifm = nlmsg_data(nlh); 4623 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4624 if (!pfx) 4625 return -EINVAL; 4626 4627 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4628 4629 /* We ignore other flags so far. */ 4630 ifa_flags &= IFA_F_MANAGETEMPADDR; 4631 4632 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4633 ifm->ifa_prefixlen); 4634 } 4635 4636 static int modify_prefix_route(struct inet6_ifaddr *ifp, 4637 unsigned long expires, u32 flags, 4638 bool modify_peer) 4639 { 4640 struct fib6_info *f6i; 4641 u32 prio; 4642 4643 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4644 ifp->prefix_len, 4645 ifp->idev->dev, 0, RTF_DEFAULT, true); 4646 if (!f6i) 4647 return -ENOENT; 4648 4649 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF; 4650 if (f6i->fib6_metric != prio) { 4651 /* delete old one */ 4652 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 4653 4654 /* add new one */ 4655 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4656 ifp->prefix_len, 4657 ifp->rt_priority, ifp->idev->dev, 4658 expires, flags, GFP_KERNEL); 4659 } else { 4660 if (!expires) 4661 fib6_clean_expires(f6i); 4662 else 4663 fib6_set_expires(f6i, expires); 4664 4665 fib6_info_release(f6i); 4666 } 4667 4668 return 0; 4669 } 4670 4671 static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg) 4672 { 4673 u32 flags; 4674 clock_t expires; 4675 unsigned long timeout; 4676 bool was_managetempaddr; 4677 bool had_prefixroute; 4678 bool new_peer = false; 4679 4680 ASSERT_RTNL(); 4681 4682 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 4683 return -EINVAL; 4684 4685 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && 4686 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4687 return -EINVAL; 4688 4689 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED) 4690 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC; 4691 4692 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 4693 if (addrconf_finite_timeout(timeout)) { 4694 expires = jiffies_to_clock_t(timeout * HZ); 4695 cfg->valid_lft = timeout; 4696 flags = RTF_EXPIRES; 4697 } else { 4698 expires = 0; 4699 flags = 0; 4700 cfg->ifa_flags |= IFA_F_PERMANENT; 4701 } 4702 4703 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 4704 if (addrconf_finite_timeout(timeout)) { 4705 if (timeout == 0) 4706 cfg->ifa_flags |= IFA_F_DEPRECATED; 4707 cfg->preferred_lft = timeout; 4708 } 4709 4710 if (cfg->peer_pfx && 4711 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) { 4712 if (!ipv6_addr_any(&ifp->peer_addr)) 4713 cleanup_prefix_route(ifp, expires, true, true); 4714 new_peer = true; 4715 } 4716 4717 spin_lock_bh(&ifp->lock); 4718 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4719 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4720 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4721 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4722 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4723 IFA_F_NOPREFIXROUTE); 4724 ifp->flags |= cfg->ifa_flags; 4725 ifp->tstamp = jiffies; 4726 ifp->valid_lft = cfg->valid_lft; 4727 ifp->prefered_lft = cfg->preferred_lft; 4728 4729 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority) 4730 ifp->rt_priority = cfg->rt_priority; 4731 4732 if (new_peer) 4733 ifp->peer_addr = *cfg->peer_pfx; 4734 4735 spin_unlock_bh(&ifp->lock); 4736 if (!(ifp->flags&IFA_F_TENTATIVE)) 4737 ipv6_ifa_notify(0, ifp); 4738 4739 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 4740 int rc = -ENOENT; 4741 4742 if (had_prefixroute) 4743 rc = modify_prefix_route(ifp, expires, flags, false); 4744 4745 /* prefix route could have been deleted; if so restore it */ 4746 if (rc == -ENOENT) { 4747 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4748 ifp->rt_priority, ifp->idev->dev, 4749 expires, flags, GFP_KERNEL); 4750 } 4751 4752 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr)) 4753 rc = modify_prefix_route(ifp, expires, flags, true); 4754 4755 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) { 4756 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len, 4757 ifp->rt_priority, ifp->idev->dev, 4758 expires, flags, GFP_KERNEL); 4759 } 4760 } else if (had_prefixroute) { 4761 enum cleanup_prefix_rt_t action; 4762 unsigned long rt_expires; 4763 4764 write_lock_bh(&ifp->idev->lock); 4765 action = check_cleanup_prefix_route(ifp, &rt_expires); 4766 write_unlock_bh(&ifp->idev->lock); 4767 4768 if (action != CLEANUP_PREFIX_RT_NOP) { 4769 cleanup_prefix_route(ifp, rt_expires, 4770 action == CLEANUP_PREFIX_RT_DEL, false); 4771 } 4772 } 4773 4774 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4775 if (was_managetempaddr && 4776 !(ifp->flags & IFA_F_MANAGETEMPADDR)) { 4777 cfg->valid_lft = 0; 4778 cfg->preferred_lft = 0; 4779 } 4780 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft, 4781 cfg->preferred_lft, !was_managetempaddr, 4782 jiffies); 4783 } 4784 4785 addrconf_verify_rtnl(); 4786 4787 return 0; 4788 } 4789 4790 static int 4791 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4792 struct netlink_ext_ack *extack) 4793 { 4794 struct net *net = sock_net(skb->sk); 4795 struct ifaddrmsg *ifm; 4796 struct nlattr *tb[IFA_MAX+1]; 4797 struct in6_addr *peer_pfx; 4798 struct inet6_ifaddr *ifa; 4799 struct net_device *dev; 4800 struct inet6_dev *idev; 4801 struct ifa6_config cfg; 4802 int err; 4803 4804 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4805 ifa_ipv6_policy, extack); 4806 if (err < 0) 4807 return err; 4808 4809 memset(&cfg, 0, sizeof(cfg)); 4810 4811 ifm = nlmsg_data(nlh); 4812 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4813 if (!cfg.pfx) 4814 return -EINVAL; 4815 4816 cfg.peer_pfx = peer_pfx; 4817 cfg.plen = ifm->ifa_prefixlen; 4818 if (tb[IFA_RT_PRIORITY]) 4819 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]); 4820 4821 cfg.valid_lft = INFINITY_LIFE_TIME; 4822 cfg.preferred_lft = INFINITY_LIFE_TIME; 4823 4824 if (tb[IFA_CACHEINFO]) { 4825 struct ifa_cacheinfo *ci; 4826 4827 ci = nla_data(tb[IFA_CACHEINFO]); 4828 cfg.valid_lft = ci->ifa_valid; 4829 cfg.preferred_lft = ci->ifa_prefered; 4830 } 4831 4832 dev = __dev_get_by_index(net, ifm->ifa_index); 4833 if (!dev) 4834 return -ENODEV; 4835 4836 if (tb[IFA_FLAGS]) 4837 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]); 4838 else 4839 cfg.ifa_flags = ifm->ifa_flags; 4840 4841 /* We ignore other flags so far. */ 4842 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | 4843 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE | 4844 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC; 4845 4846 idev = ipv6_find_idev(dev); 4847 if (IS_ERR(idev)) 4848 return PTR_ERR(idev); 4849 4850 if (!ipv6_allow_optimistic_dad(net, idev)) 4851 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC; 4852 4853 if (cfg.ifa_flags & IFA_F_NODAD && 4854 cfg.ifa_flags & IFA_F_OPTIMISTIC) { 4855 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive"); 4856 return -EINVAL; 4857 } 4858 4859 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1); 4860 if (!ifa) { 4861 /* 4862 * It would be best to check for !NLM_F_CREATE here but 4863 * userspace already relies on not having to provide this. 4864 */ 4865 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack); 4866 } 4867 4868 if (nlh->nlmsg_flags & NLM_F_EXCL || 4869 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4870 err = -EEXIST; 4871 else 4872 err = inet6_addr_modify(ifa, &cfg); 4873 4874 in6_ifa_put(ifa); 4875 4876 return err; 4877 } 4878 4879 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4880 u8 scope, int ifindex) 4881 { 4882 struct ifaddrmsg *ifm; 4883 4884 ifm = nlmsg_data(nlh); 4885 ifm->ifa_family = AF_INET6; 4886 ifm->ifa_prefixlen = prefixlen; 4887 ifm->ifa_flags = flags; 4888 ifm->ifa_scope = scope; 4889 ifm->ifa_index = ifindex; 4890 } 4891 4892 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4893 unsigned long tstamp, u32 preferred, u32 valid) 4894 { 4895 struct ifa_cacheinfo ci; 4896 4897 ci.cstamp = cstamp_delta(cstamp); 4898 ci.tstamp = cstamp_delta(tstamp); 4899 ci.ifa_prefered = preferred; 4900 ci.ifa_valid = valid; 4901 4902 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4903 } 4904 4905 static inline int rt_scope(int ifa_scope) 4906 { 4907 if (ifa_scope & IFA_HOST) 4908 return RT_SCOPE_HOST; 4909 else if (ifa_scope & IFA_LINK) 4910 return RT_SCOPE_LINK; 4911 else if (ifa_scope & IFA_SITE) 4912 return RT_SCOPE_SITE; 4913 else 4914 return RT_SCOPE_UNIVERSE; 4915 } 4916 4917 static inline int inet6_ifaddr_msgsize(void) 4918 { 4919 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4920 + nla_total_size(16) /* IFA_LOCAL */ 4921 + nla_total_size(16) /* IFA_ADDRESS */ 4922 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4923 + nla_total_size(4) /* IFA_FLAGS */ 4924 + nla_total_size(4) /* IFA_RT_PRIORITY */; 4925 } 4926 4927 enum addr_type_t { 4928 UNICAST_ADDR, 4929 MULTICAST_ADDR, 4930 ANYCAST_ADDR, 4931 }; 4932 4933 struct inet6_fill_args { 4934 u32 portid; 4935 u32 seq; 4936 int event; 4937 unsigned int flags; 4938 int netnsid; 4939 int ifindex; 4940 enum addr_type_t type; 4941 }; 4942 4943 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4944 struct inet6_fill_args *args) 4945 { 4946 struct nlmsghdr *nlh; 4947 u32 preferred, valid; 4948 4949 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 4950 sizeof(struct ifaddrmsg), args->flags); 4951 if (!nlh) 4952 return -EMSGSIZE; 4953 4954 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4955 ifa->idev->dev->ifindex); 4956 4957 if (args->netnsid >= 0 && 4958 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 4959 goto error; 4960 4961 if (!((ifa->flags&IFA_F_PERMANENT) && 4962 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4963 preferred = ifa->prefered_lft; 4964 valid = ifa->valid_lft; 4965 if (preferred != INFINITY_LIFE_TIME) { 4966 long tval = (jiffies - ifa->tstamp)/HZ; 4967 if (preferred > tval) 4968 preferred -= tval; 4969 else 4970 preferred = 0; 4971 if (valid != INFINITY_LIFE_TIME) { 4972 if (valid > tval) 4973 valid -= tval; 4974 else 4975 valid = 0; 4976 } 4977 } 4978 } else { 4979 preferred = INFINITY_LIFE_TIME; 4980 valid = INFINITY_LIFE_TIME; 4981 } 4982 4983 if (!ipv6_addr_any(&ifa->peer_addr)) { 4984 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4985 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4986 goto error; 4987 } else 4988 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4989 goto error; 4990 4991 if (ifa->rt_priority && 4992 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority)) 4993 goto error; 4994 4995 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4996 goto error; 4997 4998 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4999 goto error; 5000 5001 nlmsg_end(skb, nlh); 5002 return 0; 5003 5004 error: 5005 nlmsg_cancel(skb, nlh); 5006 return -EMSGSIZE; 5007 } 5008 5009 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 5010 struct inet6_fill_args *args) 5011 { 5012 struct nlmsghdr *nlh; 5013 u8 scope = RT_SCOPE_UNIVERSE; 5014 int ifindex = ifmca->idev->dev->ifindex; 5015 5016 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 5017 scope = RT_SCOPE_SITE; 5018 5019 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5020 sizeof(struct ifaddrmsg), args->flags); 5021 if (!nlh) 5022 return -EMSGSIZE; 5023 5024 if (args->netnsid >= 0 && 5025 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5026 nlmsg_cancel(skb, nlh); 5027 return -EMSGSIZE; 5028 } 5029 5030 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5031 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 5032 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 5033 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5034 nlmsg_cancel(skb, nlh); 5035 return -EMSGSIZE; 5036 } 5037 5038 nlmsg_end(skb, nlh); 5039 return 0; 5040 } 5041 5042 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 5043 struct inet6_fill_args *args) 5044 { 5045 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt); 5046 int ifindex = dev ? dev->ifindex : 1; 5047 struct nlmsghdr *nlh; 5048 u8 scope = RT_SCOPE_UNIVERSE; 5049 5050 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 5051 scope = RT_SCOPE_SITE; 5052 5053 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5054 sizeof(struct ifaddrmsg), args->flags); 5055 if (!nlh) 5056 return -EMSGSIZE; 5057 5058 if (args->netnsid >= 0 && 5059 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5060 nlmsg_cancel(skb, nlh); 5061 return -EMSGSIZE; 5062 } 5063 5064 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5065 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 5066 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 5067 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5068 nlmsg_cancel(skb, nlh); 5069 return -EMSGSIZE; 5070 } 5071 5072 nlmsg_end(skb, nlh); 5073 return 0; 5074 } 5075 5076 /* called with rcu_read_lock() */ 5077 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 5078 struct netlink_callback *cb, int s_ip_idx, 5079 struct inet6_fill_args *fillargs) 5080 { 5081 struct ifmcaddr6 *ifmca; 5082 struct ifacaddr6 *ifaca; 5083 int ip_idx = 0; 5084 int err = 1; 5085 5086 read_lock_bh(&idev->lock); 5087 switch (fillargs->type) { 5088 case UNICAST_ADDR: { 5089 struct inet6_ifaddr *ifa; 5090 fillargs->event = RTM_NEWADDR; 5091 5092 /* unicast address incl. temp addr */ 5093 list_for_each_entry(ifa, &idev->addr_list, if_list) { 5094 if (ip_idx < s_ip_idx) 5095 goto next; 5096 err = inet6_fill_ifaddr(skb, ifa, fillargs); 5097 if (err < 0) 5098 break; 5099 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 5100 next: 5101 ip_idx++; 5102 } 5103 break; 5104 } 5105 case MULTICAST_ADDR: 5106 fillargs->event = RTM_GETMULTICAST; 5107 5108 /* multicast address */ 5109 for (ifmca = idev->mc_list; ifmca; 5110 ifmca = ifmca->next, ip_idx++) { 5111 if (ip_idx < s_ip_idx) 5112 continue; 5113 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs); 5114 if (err < 0) 5115 break; 5116 } 5117 break; 5118 case ANYCAST_ADDR: 5119 fillargs->event = RTM_GETANYCAST; 5120 /* anycast address */ 5121 for (ifaca = idev->ac_list; ifaca; 5122 ifaca = ifaca->aca_next, ip_idx++) { 5123 if (ip_idx < s_ip_idx) 5124 continue; 5125 err = inet6_fill_ifacaddr(skb, ifaca, fillargs); 5126 if (err < 0) 5127 break; 5128 } 5129 break; 5130 default: 5131 break; 5132 } 5133 read_unlock_bh(&idev->lock); 5134 cb->args[2] = ip_idx; 5135 return err; 5136 } 5137 5138 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh, 5139 struct inet6_fill_args *fillargs, 5140 struct net **tgt_net, struct sock *sk, 5141 struct netlink_callback *cb) 5142 { 5143 struct netlink_ext_ack *extack = cb->extack; 5144 struct nlattr *tb[IFA_MAX+1]; 5145 struct ifaddrmsg *ifm; 5146 int err, i; 5147 5148 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5149 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request"); 5150 return -EINVAL; 5151 } 5152 5153 ifm = nlmsg_data(nlh); 5154 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5155 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request"); 5156 return -EINVAL; 5157 } 5158 5159 fillargs->ifindex = ifm->ifa_index; 5160 if (fillargs->ifindex) { 5161 cb->answer_flags |= NLM_F_DUMP_FILTERED; 5162 fillargs->flags |= NLM_F_DUMP_FILTERED; 5163 } 5164 5165 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5166 ifa_ipv6_policy, extack); 5167 if (err < 0) 5168 return err; 5169 5170 for (i = 0; i <= IFA_MAX; ++i) { 5171 if (!tb[i]) 5172 continue; 5173 5174 if (i == IFA_TARGET_NETNSID) { 5175 struct net *net; 5176 5177 fillargs->netnsid = nla_get_s32(tb[i]); 5178 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid); 5179 if (IS_ERR(net)) { 5180 fillargs->netnsid = -1; 5181 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id"); 5182 return PTR_ERR(net); 5183 } 5184 *tgt_net = net; 5185 } else { 5186 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); 5187 return -EINVAL; 5188 } 5189 } 5190 5191 return 0; 5192 } 5193 5194 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 5195 enum addr_type_t type) 5196 { 5197 const struct nlmsghdr *nlh = cb->nlh; 5198 struct inet6_fill_args fillargs = { 5199 .portid = NETLINK_CB(cb->skb).portid, 5200 .seq = cb->nlh->nlmsg_seq, 5201 .flags = NLM_F_MULTI, 5202 .netnsid = -1, 5203 .type = type, 5204 }; 5205 struct net *net = sock_net(skb->sk); 5206 struct net *tgt_net = net; 5207 int idx, s_idx, s_ip_idx; 5208 int h, s_h; 5209 struct net_device *dev; 5210 struct inet6_dev *idev; 5211 struct hlist_head *head; 5212 int err = 0; 5213 5214 s_h = cb->args[0]; 5215 s_idx = idx = cb->args[1]; 5216 s_ip_idx = cb->args[2]; 5217 5218 if (cb->strict_check) { 5219 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net, 5220 skb->sk, cb); 5221 if (err < 0) 5222 goto put_tgt_net; 5223 5224 err = 0; 5225 if (fillargs.ifindex) { 5226 dev = __dev_get_by_index(tgt_net, fillargs.ifindex); 5227 if (!dev) { 5228 err = -ENODEV; 5229 goto put_tgt_net; 5230 } 5231 idev = __in6_dev_get(dev); 5232 if (idev) { 5233 err = in6_dump_addrs(idev, skb, cb, s_ip_idx, 5234 &fillargs); 5235 if (err > 0) 5236 err = 0; 5237 } 5238 goto put_tgt_net; 5239 } 5240 } 5241 5242 rcu_read_lock(); 5243 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq; 5244 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5245 idx = 0; 5246 head = &tgt_net->dev_index_head[h]; 5247 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5248 if (idx < s_idx) 5249 goto cont; 5250 if (h > s_h || idx > s_idx) 5251 s_ip_idx = 0; 5252 idev = __in6_dev_get(dev); 5253 if (!idev) 5254 goto cont; 5255 5256 if (in6_dump_addrs(idev, skb, cb, s_ip_idx, 5257 &fillargs) < 0) 5258 goto done; 5259 cont: 5260 idx++; 5261 } 5262 } 5263 done: 5264 rcu_read_unlock(); 5265 cb->args[0] = h; 5266 cb->args[1] = idx; 5267 put_tgt_net: 5268 if (fillargs.netnsid >= 0) 5269 put_net(tgt_net); 5270 5271 return skb->len ? : err; 5272 } 5273 5274 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 5275 { 5276 enum addr_type_t type = UNICAST_ADDR; 5277 5278 return inet6_dump_addr(skb, cb, type); 5279 } 5280 5281 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 5282 { 5283 enum addr_type_t type = MULTICAST_ADDR; 5284 5285 return inet6_dump_addr(skb, cb, type); 5286 } 5287 5288 5289 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 5290 { 5291 enum addr_type_t type = ANYCAST_ADDR; 5292 5293 return inet6_dump_addr(skb, cb, type); 5294 } 5295 5296 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb, 5297 const struct nlmsghdr *nlh, 5298 struct nlattr **tb, 5299 struct netlink_ext_ack *extack) 5300 { 5301 struct ifaddrmsg *ifm; 5302 int i, err; 5303 5304 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5305 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request"); 5306 return -EINVAL; 5307 } 5308 5309 if (!netlink_strict_get_check(skb)) 5310 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 5311 ifa_ipv6_policy, extack); 5312 5313 ifm = nlmsg_data(nlh); 5314 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5315 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request"); 5316 return -EINVAL; 5317 } 5318 5319 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5320 ifa_ipv6_policy, extack); 5321 if (err) 5322 return err; 5323 5324 for (i = 0; i <= IFA_MAX; i++) { 5325 if (!tb[i]) 5326 continue; 5327 5328 switch (i) { 5329 case IFA_TARGET_NETNSID: 5330 case IFA_ADDRESS: 5331 case IFA_LOCAL: 5332 break; 5333 default: 5334 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request"); 5335 return -EINVAL; 5336 } 5337 } 5338 5339 return 0; 5340 } 5341 5342 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 5343 struct netlink_ext_ack *extack) 5344 { 5345 struct net *net = sock_net(in_skb->sk); 5346 struct inet6_fill_args fillargs = { 5347 .portid = NETLINK_CB(in_skb).portid, 5348 .seq = nlh->nlmsg_seq, 5349 .event = RTM_NEWADDR, 5350 .flags = 0, 5351 .netnsid = -1, 5352 }; 5353 struct net *tgt_net = net; 5354 struct ifaddrmsg *ifm; 5355 struct nlattr *tb[IFA_MAX+1]; 5356 struct in6_addr *addr = NULL, *peer; 5357 struct net_device *dev = NULL; 5358 struct inet6_ifaddr *ifa; 5359 struct sk_buff *skb; 5360 int err; 5361 5362 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack); 5363 if (err < 0) 5364 return err; 5365 5366 if (tb[IFA_TARGET_NETNSID]) { 5367 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]); 5368 5369 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk, 5370 fillargs.netnsid); 5371 if (IS_ERR(tgt_net)) 5372 return PTR_ERR(tgt_net); 5373 } 5374 5375 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 5376 if (!addr) 5377 return -EINVAL; 5378 5379 ifm = nlmsg_data(nlh); 5380 if (ifm->ifa_index) 5381 dev = dev_get_by_index(tgt_net, ifm->ifa_index); 5382 5383 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1); 5384 if (!ifa) { 5385 err = -EADDRNOTAVAIL; 5386 goto errout; 5387 } 5388 5389 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 5390 if (!skb) { 5391 err = -ENOBUFS; 5392 goto errout_ifa; 5393 } 5394 5395 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5396 if (err < 0) { 5397 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5398 WARN_ON(err == -EMSGSIZE); 5399 kfree_skb(skb); 5400 goto errout_ifa; 5401 } 5402 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid); 5403 errout_ifa: 5404 in6_ifa_put(ifa); 5405 errout: 5406 if (dev) 5407 dev_put(dev); 5408 if (fillargs.netnsid >= 0) 5409 put_net(tgt_net); 5410 5411 return err; 5412 } 5413 5414 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 5415 { 5416 struct sk_buff *skb; 5417 struct net *net = dev_net(ifa->idev->dev); 5418 struct inet6_fill_args fillargs = { 5419 .portid = 0, 5420 .seq = 0, 5421 .event = event, 5422 .flags = 0, 5423 .netnsid = -1, 5424 }; 5425 int err = -ENOBUFS; 5426 5427 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 5428 if (!skb) 5429 goto errout; 5430 5431 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5432 if (err < 0) { 5433 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5434 WARN_ON(err == -EMSGSIZE); 5435 kfree_skb(skb); 5436 goto errout; 5437 } 5438 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 5439 return; 5440 errout: 5441 if (err < 0) 5442 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 5443 } 5444 5445 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 5446 __s32 *array, int bytes) 5447 { 5448 BUG_ON(bytes < (DEVCONF_MAX * 4)); 5449 5450 memset(array, 0, bytes); 5451 array[DEVCONF_FORWARDING] = cnf->forwarding; 5452 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 5453 array[DEVCONF_MTU6] = cnf->mtu6; 5454 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 5455 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 5456 array[DEVCONF_AUTOCONF] = cnf->autoconf; 5457 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 5458 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 5459 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5460 jiffies_to_msecs(cnf->rtr_solicit_interval); 5461 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5462 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 5463 array[DEVCONF_RTR_SOLICIT_DELAY] = 5464 jiffies_to_msecs(cnf->rtr_solicit_delay); 5465 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 5466 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5467 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 5468 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5469 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 5470 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 5471 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 5472 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 5473 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 5474 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 5475 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 5476 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 5477 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 5478 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 5479 #ifdef CONFIG_IPV6_ROUTER_PREF 5480 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 5481 array[DEVCONF_RTR_PROBE_INTERVAL] = 5482 jiffies_to_msecs(cnf->rtr_probe_interval); 5483 #ifdef CONFIG_IPV6_ROUTE_INFO 5484 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen; 5485 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 5486 #endif 5487 #endif 5488 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 5489 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 5490 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5491 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 5492 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 5493 #endif 5494 #ifdef CONFIG_IPV6_MROUTE 5495 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 5496 #endif 5497 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 5498 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 5499 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 5500 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 5501 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 5502 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 5503 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 5504 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 5505 /* we omit DEVCONF_STABLE_SECRET for now */ 5506 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 5507 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 5508 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 5509 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5510 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5511 #ifdef CONFIG_IPV6_SEG6_HMAC 5512 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5513 #endif 5514 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5515 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5516 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy; 5517 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass; 5518 array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled; 5519 } 5520 5521 static inline size_t inet6_ifla6_size(void) 5522 { 5523 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5524 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5525 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5526 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5527 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5528 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */ 5529 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */ 5530 + 0; 5531 } 5532 5533 static inline size_t inet6_if_nlmsg_size(void) 5534 { 5535 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5536 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5537 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5538 + nla_total_size(4) /* IFLA_MTU */ 5539 + nla_total_size(4) /* IFLA_LINK */ 5540 + nla_total_size(1) /* IFLA_OPERSTATE */ 5541 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5542 } 5543 5544 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5545 int bytes) 5546 { 5547 int i; 5548 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5549 BUG_ON(pad < 0); 5550 5551 /* Use put_unaligned() because stats may not be aligned for u64. */ 5552 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5553 for (i = 1; i < ICMP6_MIB_MAX; i++) 5554 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5555 5556 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5557 } 5558 5559 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5560 int bytes, size_t syncpoff) 5561 { 5562 int i, c; 5563 u64 buff[IPSTATS_MIB_MAX]; 5564 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5565 5566 BUG_ON(pad < 0); 5567 5568 memset(buff, 0, sizeof(buff)); 5569 buff[0] = IPSTATS_MIB_MAX; 5570 5571 for_each_possible_cpu(c) { 5572 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5573 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5574 } 5575 5576 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5577 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5578 } 5579 5580 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5581 int bytes) 5582 { 5583 switch (attrtype) { 5584 case IFLA_INET6_STATS: 5585 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5586 offsetof(struct ipstats_mib, syncp)); 5587 break; 5588 case IFLA_INET6_ICMP6STATS: 5589 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5590 break; 5591 } 5592 } 5593 5594 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5595 u32 ext_filter_mask) 5596 { 5597 struct nlattr *nla; 5598 struct ifla_cacheinfo ci; 5599 5600 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5601 goto nla_put_failure; 5602 ci.max_reasm_len = IPV6_MAXPLEN; 5603 ci.tstamp = cstamp_delta(idev->tstamp); 5604 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5605 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5606 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5607 goto nla_put_failure; 5608 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5609 if (!nla) 5610 goto nla_put_failure; 5611 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5612 5613 /* XXX - MC not implemented */ 5614 5615 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5616 return 0; 5617 5618 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5619 if (!nla) 5620 goto nla_put_failure; 5621 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5622 5623 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5624 if (!nla) 5625 goto nla_put_failure; 5626 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5627 5628 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5629 if (!nla) 5630 goto nla_put_failure; 5631 read_lock_bh(&idev->lock); 5632 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5633 read_unlock_bh(&idev->lock); 5634 5635 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5636 goto nla_put_failure; 5637 5638 return 0; 5639 5640 nla_put_failure: 5641 return -EMSGSIZE; 5642 } 5643 5644 static size_t inet6_get_link_af_size(const struct net_device *dev, 5645 u32 ext_filter_mask) 5646 { 5647 if (!__in6_dev_get(dev)) 5648 return 0; 5649 5650 return inet6_ifla6_size(); 5651 } 5652 5653 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5654 u32 ext_filter_mask) 5655 { 5656 struct inet6_dev *idev = __in6_dev_get(dev); 5657 5658 if (!idev) 5659 return -ENODATA; 5660 5661 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5662 return -EMSGSIZE; 5663 5664 return 0; 5665 } 5666 5667 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 5668 { 5669 struct inet6_ifaddr *ifp; 5670 struct net_device *dev = idev->dev; 5671 bool clear_token, update_rs = false; 5672 struct in6_addr ll_addr; 5673 5674 ASSERT_RTNL(); 5675 5676 if (!token) 5677 return -EINVAL; 5678 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 5679 return -EINVAL; 5680 if (!ipv6_accept_ra(idev)) 5681 return -EINVAL; 5682 if (idev->cnf.rtr_solicits == 0) 5683 return -EINVAL; 5684 5685 write_lock_bh(&idev->lock); 5686 5687 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5688 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5689 5690 write_unlock_bh(&idev->lock); 5691 5692 clear_token = ipv6_addr_any(token); 5693 if (clear_token) 5694 goto update_lft; 5695 5696 if (!idev->dead && (idev->if_flags & IF_READY) && 5697 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5698 IFA_F_OPTIMISTIC)) { 5699 /* If we're not ready, then normal ifup will take care 5700 * of this. Otherwise, we need to request our rs here. 5701 */ 5702 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5703 update_rs = true; 5704 } 5705 5706 update_lft: 5707 write_lock_bh(&idev->lock); 5708 5709 if (update_rs) { 5710 idev->if_flags |= IF_RS_SENT; 5711 idev->rs_interval = rfc3315_s14_backoff_init( 5712 idev->cnf.rtr_solicit_interval); 5713 idev->rs_probes = 1; 5714 addrconf_mod_rs_timer(idev, idev->rs_interval); 5715 } 5716 5717 /* Well, that's kinda nasty ... */ 5718 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5719 spin_lock(&ifp->lock); 5720 if (ifp->tokenized) { 5721 ifp->valid_lft = 0; 5722 ifp->prefered_lft = 0; 5723 } 5724 spin_unlock(&ifp->lock); 5725 } 5726 5727 write_unlock_bh(&idev->lock); 5728 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5729 addrconf_verify_rtnl(); 5730 return 0; 5731 } 5732 5733 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5734 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5735 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5736 }; 5737 5738 static int check_addr_gen_mode(int mode) 5739 { 5740 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5741 mode != IN6_ADDR_GEN_MODE_NONE && 5742 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5743 mode != IN6_ADDR_GEN_MODE_RANDOM) 5744 return -EINVAL; 5745 return 1; 5746 } 5747 5748 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5749 int mode) 5750 { 5751 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5752 !idev->cnf.stable_secret.initialized && 5753 !net->ipv6.devconf_dflt->stable_secret.initialized) 5754 return -EINVAL; 5755 return 1; 5756 } 5757 5758 static int inet6_validate_link_af(const struct net_device *dev, 5759 const struct nlattr *nla) 5760 { 5761 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5762 struct inet6_dev *idev = NULL; 5763 int err; 5764 5765 if (dev) { 5766 idev = __in6_dev_get(dev); 5767 if (!idev) 5768 return -EAFNOSUPPORT; 5769 } 5770 5771 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, 5772 inet6_af_policy, NULL); 5773 if (err) 5774 return err; 5775 5776 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE]) 5777 return -EINVAL; 5778 5779 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5780 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5781 5782 if (check_addr_gen_mode(mode) < 0) 5783 return -EINVAL; 5784 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0) 5785 return -EINVAL; 5786 } 5787 5788 return 0; 5789 } 5790 5791 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 5792 { 5793 struct inet6_dev *idev = __in6_dev_get(dev); 5794 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5795 int err; 5796 5797 if (!idev) 5798 return -EAFNOSUPPORT; 5799 5800 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 5801 BUG(); 5802 5803 if (tb[IFLA_INET6_TOKEN]) { 5804 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 5805 if (err) 5806 return err; 5807 } 5808 5809 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5810 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5811 5812 idev->cnf.addr_gen_mode = mode; 5813 } 5814 5815 return 0; 5816 } 5817 5818 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5819 u32 portid, u32 seq, int event, unsigned int flags) 5820 { 5821 struct net_device *dev = idev->dev; 5822 struct ifinfomsg *hdr; 5823 struct nlmsghdr *nlh; 5824 void *protoinfo; 5825 5826 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5827 if (!nlh) 5828 return -EMSGSIZE; 5829 5830 hdr = nlmsg_data(nlh); 5831 hdr->ifi_family = AF_INET6; 5832 hdr->__ifi_pad = 0; 5833 hdr->ifi_type = dev->type; 5834 hdr->ifi_index = dev->ifindex; 5835 hdr->ifi_flags = dev_get_flags(dev); 5836 hdr->ifi_change = 0; 5837 5838 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5839 (dev->addr_len && 5840 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5841 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5842 (dev->ifindex != dev_get_iflink(dev) && 5843 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5844 nla_put_u8(skb, IFLA_OPERSTATE, 5845 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5846 goto nla_put_failure; 5847 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO); 5848 if (!protoinfo) 5849 goto nla_put_failure; 5850 5851 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5852 goto nla_put_failure; 5853 5854 nla_nest_end(skb, protoinfo); 5855 nlmsg_end(skb, nlh); 5856 return 0; 5857 5858 nla_put_failure: 5859 nlmsg_cancel(skb, nlh); 5860 return -EMSGSIZE; 5861 } 5862 5863 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh, 5864 struct netlink_ext_ack *extack) 5865 { 5866 struct ifinfomsg *ifm; 5867 5868 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5869 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request"); 5870 return -EINVAL; 5871 } 5872 5873 if (nlmsg_attrlen(nlh, sizeof(*ifm))) { 5874 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header"); 5875 return -EINVAL; 5876 } 5877 5878 ifm = nlmsg_data(nlh); 5879 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || 5880 ifm->ifi_change || ifm->ifi_index) { 5881 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request"); 5882 return -EINVAL; 5883 } 5884 5885 return 0; 5886 } 5887 5888 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5889 { 5890 struct net *net = sock_net(skb->sk); 5891 int h, s_h; 5892 int idx = 0, s_idx; 5893 struct net_device *dev; 5894 struct inet6_dev *idev; 5895 struct hlist_head *head; 5896 5897 /* only requests using strict checking can pass data to 5898 * influence the dump 5899 */ 5900 if (cb->strict_check) { 5901 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack); 5902 5903 if (err < 0) 5904 return err; 5905 } 5906 5907 s_h = cb->args[0]; 5908 s_idx = cb->args[1]; 5909 5910 rcu_read_lock(); 5911 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5912 idx = 0; 5913 head = &net->dev_index_head[h]; 5914 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5915 if (idx < s_idx) 5916 goto cont; 5917 idev = __in6_dev_get(dev); 5918 if (!idev) 5919 goto cont; 5920 if (inet6_fill_ifinfo(skb, idev, 5921 NETLINK_CB(cb->skb).portid, 5922 cb->nlh->nlmsg_seq, 5923 RTM_NEWLINK, NLM_F_MULTI) < 0) 5924 goto out; 5925 cont: 5926 idx++; 5927 } 5928 } 5929 out: 5930 rcu_read_unlock(); 5931 cb->args[1] = idx; 5932 cb->args[0] = h; 5933 5934 return skb->len; 5935 } 5936 5937 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5938 { 5939 struct sk_buff *skb; 5940 struct net *net = dev_net(idev->dev); 5941 int err = -ENOBUFS; 5942 5943 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5944 if (!skb) 5945 goto errout; 5946 5947 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5948 if (err < 0) { 5949 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5950 WARN_ON(err == -EMSGSIZE); 5951 kfree_skb(skb); 5952 goto errout; 5953 } 5954 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5955 return; 5956 errout: 5957 if (err < 0) 5958 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5959 } 5960 5961 static inline size_t inet6_prefix_nlmsg_size(void) 5962 { 5963 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5964 + nla_total_size(sizeof(struct in6_addr)) 5965 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5966 } 5967 5968 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5969 struct prefix_info *pinfo, u32 portid, u32 seq, 5970 int event, unsigned int flags) 5971 { 5972 struct prefixmsg *pmsg; 5973 struct nlmsghdr *nlh; 5974 struct prefix_cacheinfo ci; 5975 5976 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5977 if (!nlh) 5978 return -EMSGSIZE; 5979 5980 pmsg = nlmsg_data(nlh); 5981 pmsg->prefix_family = AF_INET6; 5982 pmsg->prefix_pad1 = 0; 5983 pmsg->prefix_pad2 = 0; 5984 pmsg->prefix_ifindex = idev->dev->ifindex; 5985 pmsg->prefix_len = pinfo->prefix_len; 5986 pmsg->prefix_type = pinfo->type; 5987 pmsg->prefix_pad3 = 0; 5988 pmsg->prefix_flags = 0; 5989 if (pinfo->onlink) 5990 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 5991 if (pinfo->autoconf) 5992 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 5993 5994 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5995 goto nla_put_failure; 5996 ci.preferred_time = ntohl(pinfo->prefered); 5997 ci.valid_time = ntohl(pinfo->valid); 5998 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 5999 goto nla_put_failure; 6000 nlmsg_end(skb, nlh); 6001 return 0; 6002 6003 nla_put_failure: 6004 nlmsg_cancel(skb, nlh); 6005 return -EMSGSIZE; 6006 } 6007 6008 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 6009 struct prefix_info *pinfo) 6010 { 6011 struct sk_buff *skb; 6012 struct net *net = dev_net(idev->dev); 6013 int err = -ENOBUFS; 6014 6015 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 6016 if (!skb) 6017 goto errout; 6018 6019 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 6020 if (err < 0) { 6021 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 6022 WARN_ON(err == -EMSGSIZE); 6023 kfree_skb(skb); 6024 goto errout; 6025 } 6026 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 6027 return; 6028 errout: 6029 if (err < 0) 6030 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 6031 } 6032 6033 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6034 { 6035 struct net *net = dev_net(ifp->idev->dev); 6036 6037 if (event) 6038 ASSERT_RTNL(); 6039 6040 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 6041 6042 switch (event) { 6043 case RTM_NEWADDR: 6044 /* 6045 * If the address was optimistic we inserted the route at the 6046 * start of our DAD process, so we don't need to do it again. 6047 * If the device was taken down in the middle of the DAD 6048 * cycle there is a race where we could get here without a 6049 * host route, so nothing to insert. That will be fixed when 6050 * the device is brought up. 6051 */ 6052 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) { 6053 ip6_ins_rt(net, ifp->rt); 6054 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) { 6055 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n", 6056 &ifp->addr, ifp->idev->dev->name); 6057 } 6058 6059 if (ifp->idev->cnf.forwarding) 6060 addrconf_join_anycast(ifp); 6061 if (!ipv6_addr_any(&ifp->peer_addr)) 6062 addrconf_prefix_route(&ifp->peer_addr, 128, 6063 ifp->rt_priority, ifp->idev->dev, 6064 0, 0, GFP_ATOMIC); 6065 break; 6066 case RTM_DELADDR: 6067 if (ifp->idev->cnf.forwarding) 6068 addrconf_leave_anycast(ifp); 6069 addrconf_leave_solict(ifp->idev, &ifp->addr); 6070 if (!ipv6_addr_any(&ifp->peer_addr)) { 6071 struct fib6_info *rt; 6072 6073 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 6074 ifp->idev->dev, 0, 0, 6075 false); 6076 if (rt) 6077 ip6_del_rt(net, rt, false); 6078 } 6079 if (ifp->rt) { 6080 ip6_del_rt(net, ifp->rt, false); 6081 ifp->rt = NULL; 6082 } 6083 rt_genid_bump_ipv6(net); 6084 break; 6085 } 6086 atomic_inc(&net->ipv6.dev_addr_genid); 6087 } 6088 6089 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6090 { 6091 rcu_read_lock_bh(); 6092 if (likely(ifp->idev->dead == 0)) 6093 __ipv6_ifa_notify(event, ifp); 6094 rcu_read_unlock_bh(); 6095 } 6096 6097 #ifdef CONFIG_SYSCTL 6098 6099 static int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 6100 void *buffer, size_t *lenp, loff_t *ppos) 6101 { 6102 int *valp = ctl->data; 6103 int val = *valp; 6104 loff_t pos = *ppos; 6105 struct ctl_table lctl; 6106 int ret; 6107 6108 /* 6109 * ctl->data points to idev->cnf.forwarding, we should 6110 * not modify it until we get the rtnl lock. 6111 */ 6112 lctl = *ctl; 6113 lctl.data = &val; 6114 6115 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6116 6117 if (write) 6118 ret = addrconf_fixup_forwarding(ctl, valp, val); 6119 if (ret) 6120 *ppos = pos; 6121 return ret; 6122 } 6123 6124 static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 6125 void *buffer, size_t *lenp, loff_t *ppos) 6126 { 6127 struct inet6_dev *idev = ctl->extra1; 6128 int min_mtu = IPV6_MIN_MTU; 6129 struct ctl_table lctl; 6130 6131 lctl = *ctl; 6132 lctl.extra1 = &min_mtu; 6133 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 6134 6135 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 6136 } 6137 6138 static void dev_disable_change(struct inet6_dev *idev) 6139 { 6140 struct netdev_notifier_info info; 6141 6142 if (!idev || !idev->dev) 6143 return; 6144 6145 netdev_notifier_info_init(&info, idev->dev); 6146 if (idev->cnf.disable_ipv6) 6147 addrconf_notify(NULL, NETDEV_DOWN, &info); 6148 else 6149 addrconf_notify(NULL, NETDEV_UP, &info); 6150 } 6151 6152 static void addrconf_disable_change(struct net *net, __s32 newf) 6153 { 6154 struct net_device *dev; 6155 struct inet6_dev *idev; 6156 6157 for_each_netdev(net, dev) { 6158 idev = __in6_dev_get(dev); 6159 if (idev) { 6160 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 6161 idev->cnf.disable_ipv6 = newf; 6162 if (changed) 6163 dev_disable_change(idev); 6164 } 6165 } 6166 } 6167 6168 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 6169 { 6170 struct net *net; 6171 int old; 6172 6173 if (!rtnl_trylock()) 6174 return restart_syscall(); 6175 6176 net = (struct net *)table->extra2; 6177 old = *p; 6178 *p = newf; 6179 6180 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 6181 rtnl_unlock(); 6182 return 0; 6183 } 6184 6185 if (p == &net->ipv6.devconf_all->disable_ipv6) { 6186 net->ipv6.devconf_dflt->disable_ipv6 = newf; 6187 addrconf_disable_change(net, newf); 6188 } else if ((!newf) ^ (!old)) 6189 dev_disable_change((struct inet6_dev *)table->extra1); 6190 6191 rtnl_unlock(); 6192 return 0; 6193 } 6194 6195 static int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 6196 void *buffer, size_t *lenp, loff_t *ppos) 6197 { 6198 int *valp = ctl->data; 6199 int val = *valp; 6200 loff_t pos = *ppos; 6201 struct ctl_table lctl; 6202 int ret; 6203 6204 /* 6205 * ctl->data points to idev->cnf.disable_ipv6, we should 6206 * not modify it until we get the rtnl lock. 6207 */ 6208 lctl = *ctl; 6209 lctl.data = &val; 6210 6211 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6212 6213 if (write) 6214 ret = addrconf_disable_ipv6(ctl, valp, val); 6215 if (ret) 6216 *ppos = pos; 6217 return ret; 6218 } 6219 6220 static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 6221 void *buffer, size_t *lenp, loff_t *ppos) 6222 { 6223 int *valp = ctl->data; 6224 int ret; 6225 int old, new; 6226 6227 old = *valp; 6228 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 6229 new = *valp; 6230 6231 if (write && old != new) { 6232 struct net *net = ctl->extra2; 6233 6234 if (!rtnl_trylock()) 6235 return restart_syscall(); 6236 6237 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 6238 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6239 NETCONFA_PROXY_NEIGH, 6240 NETCONFA_IFINDEX_DEFAULT, 6241 net->ipv6.devconf_dflt); 6242 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 6243 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6244 NETCONFA_PROXY_NEIGH, 6245 NETCONFA_IFINDEX_ALL, 6246 net->ipv6.devconf_all); 6247 else { 6248 struct inet6_dev *idev = ctl->extra1; 6249 6250 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6251 NETCONFA_PROXY_NEIGH, 6252 idev->dev->ifindex, 6253 &idev->cnf); 6254 } 6255 rtnl_unlock(); 6256 } 6257 6258 return ret; 6259 } 6260 6261 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 6262 void *buffer, size_t *lenp, 6263 loff_t *ppos) 6264 { 6265 int ret = 0; 6266 u32 new_val; 6267 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 6268 struct net *net = (struct net *)ctl->extra2; 6269 struct ctl_table tmp = { 6270 .data = &new_val, 6271 .maxlen = sizeof(new_val), 6272 .mode = ctl->mode, 6273 }; 6274 6275 if (!rtnl_trylock()) 6276 return restart_syscall(); 6277 6278 new_val = *((u32 *)ctl->data); 6279 6280 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos); 6281 if (ret != 0) 6282 goto out; 6283 6284 if (write) { 6285 if (check_addr_gen_mode(new_val) < 0) { 6286 ret = -EINVAL; 6287 goto out; 6288 } 6289 6290 if (idev) { 6291 if (check_stable_privacy(idev, net, new_val) < 0) { 6292 ret = -EINVAL; 6293 goto out; 6294 } 6295 6296 if (idev->cnf.addr_gen_mode != new_val) { 6297 idev->cnf.addr_gen_mode = new_val; 6298 addrconf_dev_config(idev->dev); 6299 } 6300 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) { 6301 struct net_device *dev; 6302 6303 net->ipv6.devconf_dflt->addr_gen_mode = new_val; 6304 for_each_netdev(net, dev) { 6305 idev = __in6_dev_get(dev); 6306 if (idev && 6307 idev->cnf.addr_gen_mode != new_val) { 6308 idev->cnf.addr_gen_mode = new_val; 6309 addrconf_dev_config(idev->dev); 6310 } 6311 } 6312 } 6313 6314 *((u32 *)ctl->data) = new_val; 6315 } 6316 6317 out: 6318 rtnl_unlock(); 6319 6320 return ret; 6321 } 6322 6323 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 6324 void *buffer, size_t *lenp, 6325 loff_t *ppos) 6326 { 6327 int err; 6328 struct in6_addr addr; 6329 char str[IPV6_MAX_STRLEN]; 6330 struct ctl_table lctl = *ctl; 6331 struct net *net = ctl->extra2; 6332 struct ipv6_stable_secret *secret = ctl->data; 6333 6334 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 6335 return -EIO; 6336 6337 lctl.maxlen = IPV6_MAX_STRLEN; 6338 lctl.data = str; 6339 6340 if (!rtnl_trylock()) 6341 return restart_syscall(); 6342 6343 if (!write && !secret->initialized) { 6344 err = -EIO; 6345 goto out; 6346 } 6347 6348 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 6349 if (err >= sizeof(str)) { 6350 err = -EIO; 6351 goto out; 6352 } 6353 6354 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 6355 if (err || !write) 6356 goto out; 6357 6358 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 6359 err = -EIO; 6360 goto out; 6361 } 6362 6363 secret->initialized = true; 6364 secret->secret = addr; 6365 6366 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 6367 struct net_device *dev; 6368 6369 for_each_netdev(net, dev) { 6370 struct inet6_dev *idev = __in6_dev_get(dev); 6371 6372 if (idev) { 6373 idev->cnf.addr_gen_mode = 6374 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6375 } 6376 } 6377 } else { 6378 struct inet6_dev *idev = ctl->extra1; 6379 6380 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6381 } 6382 6383 out: 6384 rtnl_unlock(); 6385 6386 return err; 6387 } 6388 6389 static 6390 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 6391 int write, void *buffer, 6392 size_t *lenp, 6393 loff_t *ppos) 6394 { 6395 int *valp = ctl->data; 6396 int val = *valp; 6397 loff_t pos = *ppos; 6398 struct ctl_table lctl; 6399 int ret; 6400 6401 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 6402 * we should not modify it until we get the rtnl lock. 6403 */ 6404 lctl = *ctl; 6405 lctl.data = &val; 6406 6407 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6408 6409 if (write) 6410 ret = addrconf_fixup_linkdown(ctl, valp, val); 6411 if (ret) 6412 *ppos = pos; 6413 return ret; 6414 } 6415 6416 static 6417 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 6418 { 6419 if (rt) { 6420 if (action) 6421 rt->dst.flags |= DST_NOPOLICY; 6422 else 6423 rt->dst.flags &= ~DST_NOPOLICY; 6424 } 6425 } 6426 6427 static 6428 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 6429 { 6430 struct inet6_ifaddr *ifa; 6431 6432 read_lock_bh(&idev->lock); 6433 list_for_each_entry(ifa, &idev->addr_list, if_list) { 6434 spin_lock(&ifa->lock); 6435 if (ifa->rt) { 6436 /* host routes only use builtin fib6_nh */ 6437 struct fib6_nh *nh = ifa->rt->fib6_nh; 6438 int cpu; 6439 6440 rcu_read_lock(); 6441 ifa->rt->dst_nopolicy = val ? true : false; 6442 if (nh->rt6i_pcpu) { 6443 for_each_possible_cpu(cpu) { 6444 struct rt6_info **rtp; 6445 6446 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu); 6447 addrconf_set_nopolicy(*rtp, val); 6448 } 6449 } 6450 rcu_read_unlock(); 6451 } 6452 spin_unlock(&ifa->lock); 6453 } 6454 read_unlock_bh(&idev->lock); 6455 } 6456 6457 static 6458 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 6459 { 6460 struct inet6_dev *idev; 6461 struct net *net; 6462 6463 if (!rtnl_trylock()) 6464 return restart_syscall(); 6465 6466 *valp = val; 6467 6468 net = (struct net *)ctl->extra2; 6469 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 6470 rtnl_unlock(); 6471 return 0; 6472 } 6473 6474 if (valp == &net->ipv6.devconf_all->disable_policy) { 6475 struct net_device *dev; 6476 6477 for_each_netdev(net, dev) { 6478 idev = __in6_dev_get(dev); 6479 if (idev) 6480 addrconf_disable_policy_idev(idev, val); 6481 } 6482 } else { 6483 idev = (struct inet6_dev *)ctl->extra1; 6484 addrconf_disable_policy_idev(idev, val); 6485 } 6486 6487 rtnl_unlock(); 6488 return 0; 6489 } 6490 6491 static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 6492 void *buffer, size_t *lenp, loff_t *ppos) 6493 { 6494 int *valp = ctl->data; 6495 int val = *valp; 6496 loff_t pos = *ppos; 6497 struct ctl_table lctl; 6498 int ret; 6499 6500 lctl = *ctl; 6501 lctl.data = &val; 6502 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6503 6504 if (write && (*valp != val)) 6505 ret = addrconf_disable_policy(ctl, valp, val); 6506 6507 if (ret) 6508 *ppos = pos; 6509 6510 return ret; 6511 } 6512 6513 static int minus_one = -1; 6514 static const int two_five_five = 255; 6515 6516 static const struct ctl_table addrconf_sysctl[] = { 6517 { 6518 .procname = "forwarding", 6519 .data = &ipv6_devconf.forwarding, 6520 .maxlen = sizeof(int), 6521 .mode = 0644, 6522 .proc_handler = addrconf_sysctl_forward, 6523 }, 6524 { 6525 .procname = "hop_limit", 6526 .data = &ipv6_devconf.hop_limit, 6527 .maxlen = sizeof(int), 6528 .mode = 0644, 6529 .proc_handler = proc_dointvec_minmax, 6530 .extra1 = (void *)SYSCTL_ONE, 6531 .extra2 = (void *)&two_five_five, 6532 }, 6533 { 6534 .procname = "mtu", 6535 .data = &ipv6_devconf.mtu6, 6536 .maxlen = sizeof(int), 6537 .mode = 0644, 6538 .proc_handler = addrconf_sysctl_mtu, 6539 }, 6540 { 6541 .procname = "accept_ra", 6542 .data = &ipv6_devconf.accept_ra, 6543 .maxlen = sizeof(int), 6544 .mode = 0644, 6545 .proc_handler = proc_dointvec, 6546 }, 6547 { 6548 .procname = "accept_redirects", 6549 .data = &ipv6_devconf.accept_redirects, 6550 .maxlen = sizeof(int), 6551 .mode = 0644, 6552 .proc_handler = proc_dointvec, 6553 }, 6554 { 6555 .procname = "autoconf", 6556 .data = &ipv6_devconf.autoconf, 6557 .maxlen = sizeof(int), 6558 .mode = 0644, 6559 .proc_handler = proc_dointvec, 6560 }, 6561 { 6562 .procname = "dad_transmits", 6563 .data = &ipv6_devconf.dad_transmits, 6564 .maxlen = sizeof(int), 6565 .mode = 0644, 6566 .proc_handler = proc_dointvec, 6567 }, 6568 { 6569 .procname = "router_solicitations", 6570 .data = &ipv6_devconf.rtr_solicits, 6571 .maxlen = sizeof(int), 6572 .mode = 0644, 6573 .proc_handler = proc_dointvec_minmax, 6574 .extra1 = &minus_one, 6575 }, 6576 { 6577 .procname = "router_solicitation_interval", 6578 .data = &ipv6_devconf.rtr_solicit_interval, 6579 .maxlen = sizeof(int), 6580 .mode = 0644, 6581 .proc_handler = proc_dointvec_jiffies, 6582 }, 6583 { 6584 .procname = "router_solicitation_max_interval", 6585 .data = &ipv6_devconf.rtr_solicit_max_interval, 6586 .maxlen = sizeof(int), 6587 .mode = 0644, 6588 .proc_handler = proc_dointvec_jiffies, 6589 }, 6590 { 6591 .procname = "router_solicitation_delay", 6592 .data = &ipv6_devconf.rtr_solicit_delay, 6593 .maxlen = sizeof(int), 6594 .mode = 0644, 6595 .proc_handler = proc_dointvec_jiffies, 6596 }, 6597 { 6598 .procname = "force_mld_version", 6599 .data = &ipv6_devconf.force_mld_version, 6600 .maxlen = sizeof(int), 6601 .mode = 0644, 6602 .proc_handler = proc_dointvec, 6603 }, 6604 { 6605 .procname = "mldv1_unsolicited_report_interval", 6606 .data = 6607 &ipv6_devconf.mldv1_unsolicited_report_interval, 6608 .maxlen = sizeof(int), 6609 .mode = 0644, 6610 .proc_handler = proc_dointvec_ms_jiffies, 6611 }, 6612 { 6613 .procname = "mldv2_unsolicited_report_interval", 6614 .data = 6615 &ipv6_devconf.mldv2_unsolicited_report_interval, 6616 .maxlen = sizeof(int), 6617 .mode = 0644, 6618 .proc_handler = proc_dointvec_ms_jiffies, 6619 }, 6620 { 6621 .procname = "use_tempaddr", 6622 .data = &ipv6_devconf.use_tempaddr, 6623 .maxlen = sizeof(int), 6624 .mode = 0644, 6625 .proc_handler = proc_dointvec, 6626 }, 6627 { 6628 .procname = "temp_valid_lft", 6629 .data = &ipv6_devconf.temp_valid_lft, 6630 .maxlen = sizeof(int), 6631 .mode = 0644, 6632 .proc_handler = proc_dointvec, 6633 }, 6634 { 6635 .procname = "temp_prefered_lft", 6636 .data = &ipv6_devconf.temp_prefered_lft, 6637 .maxlen = sizeof(int), 6638 .mode = 0644, 6639 .proc_handler = proc_dointvec, 6640 }, 6641 { 6642 .procname = "regen_max_retry", 6643 .data = &ipv6_devconf.regen_max_retry, 6644 .maxlen = sizeof(int), 6645 .mode = 0644, 6646 .proc_handler = proc_dointvec, 6647 }, 6648 { 6649 .procname = "max_desync_factor", 6650 .data = &ipv6_devconf.max_desync_factor, 6651 .maxlen = sizeof(int), 6652 .mode = 0644, 6653 .proc_handler = proc_dointvec, 6654 }, 6655 { 6656 .procname = "max_addresses", 6657 .data = &ipv6_devconf.max_addresses, 6658 .maxlen = sizeof(int), 6659 .mode = 0644, 6660 .proc_handler = proc_dointvec, 6661 }, 6662 { 6663 .procname = "accept_ra_defrtr", 6664 .data = &ipv6_devconf.accept_ra_defrtr, 6665 .maxlen = sizeof(int), 6666 .mode = 0644, 6667 .proc_handler = proc_dointvec, 6668 }, 6669 { 6670 .procname = "accept_ra_min_hop_limit", 6671 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6672 .maxlen = sizeof(int), 6673 .mode = 0644, 6674 .proc_handler = proc_dointvec, 6675 }, 6676 { 6677 .procname = "accept_ra_pinfo", 6678 .data = &ipv6_devconf.accept_ra_pinfo, 6679 .maxlen = sizeof(int), 6680 .mode = 0644, 6681 .proc_handler = proc_dointvec, 6682 }, 6683 #ifdef CONFIG_IPV6_ROUTER_PREF 6684 { 6685 .procname = "accept_ra_rtr_pref", 6686 .data = &ipv6_devconf.accept_ra_rtr_pref, 6687 .maxlen = sizeof(int), 6688 .mode = 0644, 6689 .proc_handler = proc_dointvec, 6690 }, 6691 { 6692 .procname = "router_probe_interval", 6693 .data = &ipv6_devconf.rtr_probe_interval, 6694 .maxlen = sizeof(int), 6695 .mode = 0644, 6696 .proc_handler = proc_dointvec_jiffies, 6697 }, 6698 #ifdef CONFIG_IPV6_ROUTE_INFO 6699 { 6700 .procname = "accept_ra_rt_info_min_plen", 6701 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6702 .maxlen = sizeof(int), 6703 .mode = 0644, 6704 .proc_handler = proc_dointvec, 6705 }, 6706 { 6707 .procname = "accept_ra_rt_info_max_plen", 6708 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6709 .maxlen = sizeof(int), 6710 .mode = 0644, 6711 .proc_handler = proc_dointvec, 6712 }, 6713 #endif 6714 #endif 6715 { 6716 .procname = "proxy_ndp", 6717 .data = &ipv6_devconf.proxy_ndp, 6718 .maxlen = sizeof(int), 6719 .mode = 0644, 6720 .proc_handler = addrconf_sysctl_proxy_ndp, 6721 }, 6722 { 6723 .procname = "accept_source_route", 6724 .data = &ipv6_devconf.accept_source_route, 6725 .maxlen = sizeof(int), 6726 .mode = 0644, 6727 .proc_handler = proc_dointvec, 6728 }, 6729 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6730 { 6731 .procname = "optimistic_dad", 6732 .data = &ipv6_devconf.optimistic_dad, 6733 .maxlen = sizeof(int), 6734 .mode = 0644, 6735 .proc_handler = proc_dointvec, 6736 }, 6737 { 6738 .procname = "use_optimistic", 6739 .data = &ipv6_devconf.use_optimistic, 6740 .maxlen = sizeof(int), 6741 .mode = 0644, 6742 .proc_handler = proc_dointvec, 6743 }, 6744 #endif 6745 #ifdef CONFIG_IPV6_MROUTE 6746 { 6747 .procname = "mc_forwarding", 6748 .data = &ipv6_devconf.mc_forwarding, 6749 .maxlen = sizeof(int), 6750 .mode = 0444, 6751 .proc_handler = proc_dointvec, 6752 }, 6753 #endif 6754 { 6755 .procname = "disable_ipv6", 6756 .data = &ipv6_devconf.disable_ipv6, 6757 .maxlen = sizeof(int), 6758 .mode = 0644, 6759 .proc_handler = addrconf_sysctl_disable, 6760 }, 6761 { 6762 .procname = "accept_dad", 6763 .data = &ipv6_devconf.accept_dad, 6764 .maxlen = sizeof(int), 6765 .mode = 0644, 6766 .proc_handler = proc_dointvec, 6767 }, 6768 { 6769 .procname = "force_tllao", 6770 .data = &ipv6_devconf.force_tllao, 6771 .maxlen = sizeof(int), 6772 .mode = 0644, 6773 .proc_handler = proc_dointvec 6774 }, 6775 { 6776 .procname = "ndisc_notify", 6777 .data = &ipv6_devconf.ndisc_notify, 6778 .maxlen = sizeof(int), 6779 .mode = 0644, 6780 .proc_handler = proc_dointvec 6781 }, 6782 { 6783 .procname = "suppress_frag_ndisc", 6784 .data = &ipv6_devconf.suppress_frag_ndisc, 6785 .maxlen = sizeof(int), 6786 .mode = 0644, 6787 .proc_handler = proc_dointvec 6788 }, 6789 { 6790 .procname = "accept_ra_from_local", 6791 .data = &ipv6_devconf.accept_ra_from_local, 6792 .maxlen = sizeof(int), 6793 .mode = 0644, 6794 .proc_handler = proc_dointvec, 6795 }, 6796 { 6797 .procname = "accept_ra_mtu", 6798 .data = &ipv6_devconf.accept_ra_mtu, 6799 .maxlen = sizeof(int), 6800 .mode = 0644, 6801 .proc_handler = proc_dointvec, 6802 }, 6803 { 6804 .procname = "stable_secret", 6805 .data = &ipv6_devconf.stable_secret, 6806 .maxlen = IPV6_MAX_STRLEN, 6807 .mode = 0600, 6808 .proc_handler = addrconf_sysctl_stable_secret, 6809 }, 6810 { 6811 .procname = "use_oif_addrs_only", 6812 .data = &ipv6_devconf.use_oif_addrs_only, 6813 .maxlen = sizeof(int), 6814 .mode = 0644, 6815 .proc_handler = proc_dointvec, 6816 }, 6817 { 6818 .procname = "ignore_routes_with_linkdown", 6819 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6820 .maxlen = sizeof(int), 6821 .mode = 0644, 6822 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6823 }, 6824 { 6825 .procname = "drop_unicast_in_l2_multicast", 6826 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6827 .maxlen = sizeof(int), 6828 .mode = 0644, 6829 .proc_handler = proc_dointvec, 6830 }, 6831 { 6832 .procname = "drop_unsolicited_na", 6833 .data = &ipv6_devconf.drop_unsolicited_na, 6834 .maxlen = sizeof(int), 6835 .mode = 0644, 6836 .proc_handler = proc_dointvec, 6837 }, 6838 { 6839 .procname = "keep_addr_on_down", 6840 .data = &ipv6_devconf.keep_addr_on_down, 6841 .maxlen = sizeof(int), 6842 .mode = 0644, 6843 .proc_handler = proc_dointvec, 6844 6845 }, 6846 { 6847 .procname = "seg6_enabled", 6848 .data = &ipv6_devconf.seg6_enabled, 6849 .maxlen = sizeof(int), 6850 .mode = 0644, 6851 .proc_handler = proc_dointvec, 6852 }, 6853 #ifdef CONFIG_IPV6_SEG6_HMAC 6854 { 6855 .procname = "seg6_require_hmac", 6856 .data = &ipv6_devconf.seg6_require_hmac, 6857 .maxlen = sizeof(int), 6858 .mode = 0644, 6859 .proc_handler = proc_dointvec, 6860 }, 6861 #endif 6862 { 6863 .procname = "enhanced_dad", 6864 .data = &ipv6_devconf.enhanced_dad, 6865 .maxlen = sizeof(int), 6866 .mode = 0644, 6867 .proc_handler = proc_dointvec, 6868 }, 6869 { 6870 .procname = "addr_gen_mode", 6871 .data = &ipv6_devconf.addr_gen_mode, 6872 .maxlen = sizeof(int), 6873 .mode = 0644, 6874 .proc_handler = addrconf_sysctl_addr_gen_mode, 6875 }, 6876 { 6877 .procname = "disable_policy", 6878 .data = &ipv6_devconf.disable_policy, 6879 .maxlen = sizeof(int), 6880 .mode = 0644, 6881 .proc_handler = addrconf_sysctl_disable_policy, 6882 }, 6883 { 6884 .procname = "ndisc_tclass", 6885 .data = &ipv6_devconf.ndisc_tclass, 6886 .maxlen = sizeof(int), 6887 .mode = 0644, 6888 .proc_handler = proc_dointvec_minmax, 6889 .extra1 = (void *)SYSCTL_ZERO, 6890 .extra2 = (void *)&two_five_five, 6891 }, 6892 { 6893 .procname = "rpl_seg_enabled", 6894 .data = &ipv6_devconf.rpl_seg_enabled, 6895 .maxlen = sizeof(int), 6896 .mode = 0644, 6897 .proc_handler = proc_dointvec, 6898 }, 6899 { 6900 /* sentinel */ 6901 } 6902 }; 6903 6904 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 6905 struct inet6_dev *idev, struct ipv6_devconf *p) 6906 { 6907 int i, ifindex; 6908 struct ctl_table *table; 6909 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 6910 6911 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 6912 if (!table) 6913 goto out; 6914 6915 for (i = 0; table[i].data; i++) { 6916 table[i].data += (char *)p - (char *)&ipv6_devconf; 6917 /* If one of these is already set, then it is not safe to 6918 * overwrite either of them: this makes proc_dointvec_minmax 6919 * usable. 6920 */ 6921 if (!table[i].extra1 && !table[i].extra2) { 6922 table[i].extra1 = idev; /* embedded; no ref */ 6923 table[i].extra2 = net; 6924 } 6925 } 6926 6927 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 6928 6929 p->sysctl_header = register_net_sysctl(net, path, table); 6930 if (!p->sysctl_header) 6931 goto free; 6932 6933 if (!strcmp(dev_name, "all")) 6934 ifindex = NETCONFA_IFINDEX_ALL; 6935 else if (!strcmp(dev_name, "default")) 6936 ifindex = NETCONFA_IFINDEX_DEFAULT; 6937 else 6938 ifindex = idev->dev->ifindex; 6939 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 6940 ifindex, p); 6941 return 0; 6942 6943 free: 6944 kfree(table); 6945 out: 6946 return -ENOBUFS; 6947 } 6948 6949 static void __addrconf_sysctl_unregister(struct net *net, 6950 struct ipv6_devconf *p, int ifindex) 6951 { 6952 struct ctl_table *table; 6953 6954 if (!p->sysctl_header) 6955 return; 6956 6957 table = p->sysctl_header->ctl_table_arg; 6958 unregister_net_sysctl_table(p->sysctl_header); 6959 p->sysctl_header = NULL; 6960 kfree(table); 6961 6962 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 6963 } 6964 6965 static int addrconf_sysctl_register(struct inet6_dev *idev) 6966 { 6967 int err; 6968 6969 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 6970 return -EINVAL; 6971 6972 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 6973 &ndisc_ifinfo_sysctl_change); 6974 if (err) 6975 return err; 6976 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 6977 idev, &idev->cnf); 6978 if (err) 6979 neigh_sysctl_unregister(idev->nd_parms); 6980 6981 return err; 6982 } 6983 6984 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 6985 { 6986 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 6987 idev->dev->ifindex); 6988 neigh_sysctl_unregister(idev->nd_parms); 6989 } 6990 6991 6992 #endif 6993 6994 static int __net_init addrconf_init_net(struct net *net) 6995 { 6996 int err = -ENOMEM; 6997 struct ipv6_devconf *all, *dflt; 6998 6999 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 7000 if (!all) 7001 goto err_alloc_all; 7002 7003 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 7004 if (!dflt) 7005 goto err_alloc_dflt; 7006 7007 if (IS_ENABLED(CONFIG_SYSCTL) && 7008 !net_eq(net, &init_net)) { 7009 switch (sysctl_devconf_inherit_init_net) { 7010 case 1: /* copy from init_net */ 7011 memcpy(all, init_net.ipv6.devconf_all, 7012 sizeof(ipv6_devconf)); 7013 memcpy(dflt, init_net.ipv6.devconf_dflt, 7014 sizeof(ipv6_devconf_dflt)); 7015 break; 7016 case 3: /* copy from the current netns */ 7017 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all, 7018 sizeof(ipv6_devconf)); 7019 memcpy(dflt, 7020 current->nsproxy->net_ns->ipv6.devconf_dflt, 7021 sizeof(ipv6_devconf_dflt)); 7022 break; 7023 case 0: 7024 case 2: 7025 /* use compiled values */ 7026 break; 7027 } 7028 } 7029 7030 /* these will be inherited by all namespaces */ 7031 dflt->autoconf = ipv6_defaults.autoconf; 7032 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 7033 7034 dflt->stable_secret.initialized = false; 7035 all->stable_secret.initialized = false; 7036 7037 net->ipv6.devconf_all = all; 7038 net->ipv6.devconf_dflt = dflt; 7039 7040 #ifdef CONFIG_SYSCTL 7041 err = __addrconf_sysctl_register(net, "all", NULL, all); 7042 if (err < 0) 7043 goto err_reg_all; 7044 7045 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 7046 if (err < 0) 7047 goto err_reg_dflt; 7048 #endif 7049 return 0; 7050 7051 #ifdef CONFIG_SYSCTL 7052 err_reg_dflt: 7053 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 7054 err_reg_all: 7055 kfree(dflt); 7056 #endif 7057 err_alloc_dflt: 7058 kfree(all); 7059 err_alloc_all: 7060 return err; 7061 } 7062 7063 static void __net_exit addrconf_exit_net(struct net *net) 7064 { 7065 #ifdef CONFIG_SYSCTL 7066 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 7067 NETCONFA_IFINDEX_DEFAULT); 7068 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 7069 NETCONFA_IFINDEX_ALL); 7070 #endif 7071 kfree(net->ipv6.devconf_dflt); 7072 kfree(net->ipv6.devconf_all); 7073 } 7074 7075 static struct pernet_operations addrconf_ops = { 7076 .init = addrconf_init_net, 7077 .exit = addrconf_exit_net, 7078 }; 7079 7080 static struct rtnl_af_ops inet6_ops __read_mostly = { 7081 .family = AF_INET6, 7082 .fill_link_af = inet6_fill_link_af, 7083 .get_link_af_size = inet6_get_link_af_size, 7084 .validate_link_af = inet6_validate_link_af, 7085 .set_link_af = inet6_set_link_af, 7086 }; 7087 7088 /* 7089 * Init / cleanup code 7090 */ 7091 7092 int __init addrconf_init(void) 7093 { 7094 struct inet6_dev *idev; 7095 int i, err; 7096 7097 err = ipv6_addr_label_init(); 7098 if (err < 0) { 7099 pr_crit("%s: cannot initialize default policy table: %d\n", 7100 __func__, err); 7101 goto out; 7102 } 7103 7104 err = register_pernet_subsys(&addrconf_ops); 7105 if (err < 0) 7106 goto out_addrlabel; 7107 7108 addrconf_wq = create_workqueue("ipv6_addrconf"); 7109 if (!addrconf_wq) { 7110 err = -ENOMEM; 7111 goto out_nowq; 7112 } 7113 7114 /* The addrconf netdev notifier requires that loopback_dev 7115 * has it's ipv6 private information allocated and setup 7116 * before it can bring up and give link-local addresses 7117 * to other devices which are up. 7118 * 7119 * Unfortunately, loopback_dev is not necessarily the first 7120 * entry in the global dev_base list of net devices. In fact, 7121 * it is likely to be the very last entry on that list. 7122 * So this causes the notifier registry below to try and 7123 * give link-local addresses to all devices besides loopback_dev 7124 * first, then loopback_dev, which cases all the non-loopback_dev 7125 * devices to fail to get a link-local address. 7126 * 7127 * So, as a temporary fix, allocate the ipv6 structure for 7128 * loopback_dev first by hand. 7129 * Longer term, all of the dependencies ipv6 has upon the loopback 7130 * device and it being up should be removed. 7131 */ 7132 rtnl_lock(); 7133 idev = ipv6_add_dev(init_net.loopback_dev); 7134 rtnl_unlock(); 7135 if (IS_ERR(idev)) { 7136 err = PTR_ERR(idev); 7137 goto errlo; 7138 } 7139 7140 ip6_route_init_special_entries(); 7141 7142 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7143 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 7144 7145 register_netdevice_notifier(&ipv6_dev_notf); 7146 7147 addrconf_verify(); 7148 7149 rtnl_af_register(&inet6_ops); 7150 7151 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK, 7152 NULL, inet6_dump_ifinfo, 0); 7153 if (err < 0) 7154 goto errout; 7155 7156 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR, 7157 inet6_rtm_newaddr, NULL, 0); 7158 if (err < 0) 7159 goto errout; 7160 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR, 7161 inet6_rtm_deladdr, NULL, 0); 7162 if (err < 0) 7163 goto errout; 7164 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR, 7165 inet6_rtm_getaddr, inet6_dump_ifaddr, 7166 RTNL_FLAG_DOIT_UNLOCKED); 7167 if (err < 0) 7168 goto errout; 7169 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST, 7170 NULL, inet6_dump_ifmcaddr, 0); 7171 if (err < 0) 7172 goto errout; 7173 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST, 7174 NULL, inet6_dump_ifacaddr, 0); 7175 if (err < 0) 7176 goto errout; 7177 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF, 7178 inet6_netconf_get_devconf, 7179 inet6_netconf_dump_devconf, 7180 RTNL_FLAG_DOIT_UNLOCKED); 7181 if (err < 0) 7182 goto errout; 7183 err = ipv6_addr_label_rtnl_register(); 7184 if (err < 0) 7185 goto errout; 7186 7187 return 0; 7188 errout: 7189 rtnl_unregister_all(PF_INET6); 7190 rtnl_af_unregister(&inet6_ops); 7191 unregister_netdevice_notifier(&ipv6_dev_notf); 7192 errlo: 7193 destroy_workqueue(addrconf_wq); 7194 out_nowq: 7195 unregister_pernet_subsys(&addrconf_ops); 7196 out_addrlabel: 7197 ipv6_addr_label_cleanup(); 7198 out: 7199 return err; 7200 } 7201 7202 void addrconf_cleanup(void) 7203 { 7204 struct net_device *dev; 7205 int i; 7206 7207 unregister_netdevice_notifier(&ipv6_dev_notf); 7208 unregister_pernet_subsys(&addrconf_ops); 7209 ipv6_addr_label_cleanup(); 7210 7211 rtnl_af_unregister(&inet6_ops); 7212 7213 rtnl_lock(); 7214 7215 /* clean dev list */ 7216 for_each_netdev(&init_net, dev) { 7217 if (__in6_dev_get(dev) == NULL) 7218 continue; 7219 addrconf_ifdown(dev, true); 7220 } 7221 addrconf_ifdown(init_net.loopback_dev, true); 7222 7223 /* 7224 * Check hash table. 7225 */ 7226 spin_lock_bh(&addrconf_hash_lock); 7227 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7228 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 7229 spin_unlock_bh(&addrconf_hash_lock); 7230 cancel_delayed_work(&addr_chk_work); 7231 rtnl_unlock(); 7232 7233 destroy_workqueue(addrconf_wq); 7234 } 7235