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, int how); 167 168 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 169 int plen, 170 const struct net_device *dev, 171 u32 flags, u32 noflags, 172 bool no_gw); 173 174 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 175 static void addrconf_dad_work(struct work_struct *w); 176 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 177 bool send_na); 178 static void addrconf_dad_run(struct inet6_dev *idev, bool restart); 179 static void addrconf_rs_timer(struct timer_list *t); 180 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 181 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 182 183 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 184 struct prefix_info *pinfo); 185 186 static struct ipv6_devconf ipv6_devconf __read_mostly = { 187 .forwarding = 0, 188 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 189 .mtu6 = IPV6_MIN_MTU, 190 .accept_ra = 1, 191 .accept_redirects = 1, 192 .autoconf = 1, 193 .force_mld_version = 0, 194 .mldv1_unsolicited_report_interval = 10 * HZ, 195 .mldv2_unsolicited_report_interval = HZ, 196 .dad_transmits = 1, 197 .rtr_solicits = MAX_RTR_SOLICITATIONS, 198 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 199 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 200 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 201 .use_tempaddr = 0, 202 .temp_valid_lft = TEMP_VALID_LIFETIME, 203 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 204 .regen_max_retry = REGEN_MAX_RETRY, 205 .max_desync_factor = MAX_DESYNC_FACTOR, 206 .max_addresses = IPV6_MAX_ADDRESSES, 207 .accept_ra_defrtr = 1, 208 .accept_ra_from_local = 0, 209 .accept_ra_min_hop_limit= 1, 210 .accept_ra_pinfo = 1, 211 #ifdef CONFIG_IPV6_ROUTER_PREF 212 .accept_ra_rtr_pref = 1, 213 .rtr_probe_interval = 60 * HZ, 214 #ifdef CONFIG_IPV6_ROUTE_INFO 215 .accept_ra_rt_info_min_plen = 0, 216 .accept_ra_rt_info_max_plen = 0, 217 #endif 218 #endif 219 .proxy_ndp = 0, 220 .accept_source_route = 0, /* we do not accept RH0 by default. */ 221 .disable_ipv6 = 0, 222 .accept_dad = 0, 223 .suppress_frag_ndisc = 1, 224 .accept_ra_mtu = 1, 225 .stable_secret = { 226 .initialized = false, 227 }, 228 .use_oif_addrs_only = 0, 229 .ignore_routes_with_linkdown = 0, 230 .keep_addr_on_down = 0, 231 .seg6_enabled = 0, 232 #ifdef CONFIG_IPV6_SEG6_HMAC 233 .seg6_require_hmac = 0, 234 #endif 235 .enhanced_dad = 1, 236 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 237 .disable_policy = 0, 238 .rpl_seg_enabled = 0, 239 }; 240 241 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 242 .forwarding = 0, 243 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 244 .mtu6 = IPV6_MIN_MTU, 245 .accept_ra = 1, 246 .accept_redirects = 1, 247 .autoconf = 1, 248 .force_mld_version = 0, 249 .mldv1_unsolicited_report_interval = 10 * HZ, 250 .mldv2_unsolicited_report_interval = HZ, 251 .dad_transmits = 1, 252 .rtr_solicits = MAX_RTR_SOLICITATIONS, 253 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 254 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 255 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 256 .use_tempaddr = 0, 257 .temp_valid_lft = TEMP_VALID_LIFETIME, 258 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 259 .regen_max_retry = REGEN_MAX_RETRY, 260 .max_desync_factor = MAX_DESYNC_FACTOR, 261 .max_addresses = IPV6_MAX_ADDRESSES, 262 .accept_ra_defrtr = 1, 263 .accept_ra_from_local = 0, 264 .accept_ra_min_hop_limit= 1, 265 .accept_ra_pinfo = 1, 266 #ifdef CONFIG_IPV6_ROUTER_PREF 267 .accept_ra_rtr_pref = 1, 268 .rtr_probe_interval = 60 * HZ, 269 #ifdef CONFIG_IPV6_ROUTE_INFO 270 .accept_ra_rt_info_min_plen = 0, 271 .accept_ra_rt_info_max_plen = 0, 272 #endif 273 #endif 274 .proxy_ndp = 0, 275 .accept_source_route = 0, /* we do not accept RH0 by default. */ 276 .disable_ipv6 = 0, 277 .accept_dad = 1, 278 .suppress_frag_ndisc = 1, 279 .accept_ra_mtu = 1, 280 .stable_secret = { 281 .initialized = false, 282 }, 283 .use_oif_addrs_only = 0, 284 .ignore_routes_with_linkdown = 0, 285 .keep_addr_on_down = 0, 286 .seg6_enabled = 0, 287 #ifdef CONFIG_IPV6_SEG6_HMAC 288 .seg6_require_hmac = 0, 289 #endif 290 .enhanced_dad = 1, 291 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 292 .disable_policy = 0, 293 .rpl_seg_enabled = 0, 294 }; 295 296 /* Check if link is ready: is it up and is a valid qdisc available */ 297 static inline bool addrconf_link_ready(const struct net_device *dev) 298 { 299 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev); 300 } 301 302 static void addrconf_del_rs_timer(struct inet6_dev *idev) 303 { 304 if (del_timer(&idev->rs_timer)) 305 __in6_dev_put(idev); 306 } 307 308 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 309 { 310 if (cancel_delayed_work(&ifp->dad_work)) 311 __in6_ifa_put(ifp); 312 } 313 314 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 315 unsigned long when) 316 { 317 if (!timer_pending(&idev->rs_timer)) 318 in6_dev_hold(idev); 319 mod_timer(&idev->rs_timer, jiffies + when); 320 } 321 322 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 323 unsigned long delay) 324 { 325 in6_ifa_hold(ifp); 326 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay)) 327 in6_ifa_put(ifp); 328 } 329 330 static int snmp6_alloc_dev(struct inet6_dev *idev) 331 { 332 int i; 333 334 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib); 335 if (!idev->stats.ipv6) 336 goto err_ip; 337 338 for_each_possible_cpu(i) { 339 struct ipstats_mib *addrconf_stats; 340 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 341 u64_stats_init(&addrconf_stats->syncp); 342 } 343 344 345 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 346 GFP_KERNEL); 347 if (!idev->stats.icmpv6dev) 348 goto err_icmp; 349 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 350 GFP_KERNEL); 351 if (!idev->stats.icmpv6msgdev) 352 goto err_icmpmsg; 353 354 return 0; 355 356 err_icmpmsg: 357 kfree(idev->stats.icmpv6dev); 358 err_icmp: 359 free_percpu(idev->stats.ipv6); 360 err_ip: 361 return -ENOMEM; 362 } 363 364 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 365 { 366 struct inet6_dev *ndev; 367 int err = -ENOMEM; 368 369 ASSERT_RTNL(); 370 371 if (dev->mtu < IPV6_MIN_MTU) 372 return ERR_PTR(-EINVAL); 373 374 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 375 if (!ndev) 376 return ERR_PTR(err); 377 378 rwlock_init(&ndev->lock); 379 ndev->dev = dev; 380 INIT_LIST_HEAD(&ndev->addr_list); 381 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0); 382 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 383 384 if (ndev->cnf.stable_secret.initialized) 385 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 386 387 ndev->cnf.mtu6 = dev->mtu; 388 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 389 if (!ndev->nd_parms) { 390 kfree(ndev); 391 return ERR_PTR(err); 392 } 393 if (ndev->cnf.forwarding) 394 dev_disable_lro(dev); 395 /* We refer to the device */ 396 dev_hold(dev); 397 398 if (snmp6_alloc_dev(ndev) < 0) { 399 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n", 400 __func__); 401 neigh_parms_release(&nd_tbl, ndev->nd_parms); 402 dev_put(dev); 403 kfree(ndev); 404 return ERR_PTR(err); 405 } 406 407 if (snmp6_register_dev(ndev) < 0) { 408 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n", 409 __func__, dev->name); 410 goto err_release; 411 } 412 413 /* One reference from device. */ 414 refcount_set(&ndev->refcnt, 1); 415 416 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 417 ndev->cnf.accept_dad = -1; 418 419 #if IS_ENABLED(CONFIG_IPV6_SIT) 420 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 421 pr_info("%s: Disabled Multicast RS\n", dev->name); 422 ndev->cnf.rtr_solicits = 0; 423 } 424 #endif 425 426 INIT_LIST_HEAD(&ndev->tempaddr_list); 427 ndev->desync_factor = U32_MAX; 428 if ((dev->flags&IFF_LOOPBACK) || 429 dev->type == ARPHRD_TUNNEL || 430 dev->type == ARPHRD_TUNNEL6 || 431 dev->type == ARPHRD_SIT || 432 dev->type == ARPHRD_NONE) { 433 ndev->cnf.use_tempaddr = -1; 434 } 435 436 ndev->token = in6addr_any; 437 438 if (netif_running(dev) && addrconf_link_ready(dev)) 439 ndev->if_flags |= IF_READY; 440 441 ipv6_mc_init_dev(ndev); 442 ndev->tstamp = jiffies; 443 err = addrconf_sysctl_register(ndev); 444 if (err) { 445 ipv6_mc_destroy_dev(ndev); 446 snmp6_unregister_dev(ndev); 447 goto err_release; 448 } 449 /* protected by rtnl_lock */ 450 rcu_assign_pointer(dev->ip6_ptr, ndev); 451 452 /* Join interface-local all-node multicast group */ 453 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 454 455 /* Join all-node multicast group */ 456 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 457 458 /* Join all-router multicast group if forwarding is set */ 459 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 460 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 461 462 return ndev; 463 464 err_release: 465 neigh_parms_release(&nd_tbl, ndev->nd_parms); 466 ndev->dead = 1; 467 in6_dev_finish_destroy(ndev); 468 return ERR_PTR(err); 469 } 470 471 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 472 { 473 struct inet6_dev *idev; 474 475 ASSERT_RTNL(); 476 477 idev = __in6_dev_get(dev); 478 if (!idev) { 479 idev = ipv6_add_dev(dev); 480 if (IS_ERR(idev)) 481 return idev; 482 } 483 484 if (dev->flags&IFF_UP) 485 ipv6_mc_up(idev); 486 return idev; 487 } 488 489 static int inet6_netconf_msgsize_devconf(int type) 490 { 491 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 492 + nla_total_size(4); /* NETCONFA_IFINDEX */ 493 bool all = false; 494 495 if (type == NETCONFA_ALL) 496 all = true; 497 498 if (all || type == NETCONFA_FORWARDING) 499 size += nla_total_size(4); 500 #ifdef CONFIG_IPV6_MROUTE 501 if (all || type == NETCONFA_MC_FORWARDING) 502 size += nla_total_size(4); 503 #endif 504 if (all || type == NETCONFA_PROXY_NEIGH) 505 size += nla_total_size(4); 506 507 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 508 size += nla_total_size(4); 509 510 return size; 511 } 512 513 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 514 struct ipv6_devconf *devconf, u32 portid, 515 u32 seq, int event, unsigned int flags, 516 int type) 517 { 518 struct nlmsghdr *nlh; 519 struct netconfmsg *ncm; 520 bool all = false; 521 522 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 523 flags); 524 if (!nlh) 525 return -EMSGSIZE; 526 527 if (type == NETCONFA_ALL) 528 all = true; 529 530 ncm = nlmsg_data(nlh); 531 ncm->ncm_family = AF_INET6; 532 533 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 534 goto nla_put_failure; 535 536 if (!devconf) 537 goto out; 538 539 if ((all || type == NETCONFA_FORWARDING) && 540 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 541 goto nla_put_failure; 542 #ifdef CONFIG_IPV6_MROUTE 543 if ((all || type == NETCONFA_MC_FORWARDING) && 544 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 545 devconf->mc_forwarding) < 0) 546 goto nla_put_failure; 547 #endif 548 if ((all || type == NETCONFA_PROXY_NEIGH) && 549 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 550 goto nla_put_failure; 551 552 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 553 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 554 devconf->ignore_routes_with_linkdown) < 0) 555 goto nla_put_failure; 556 557 out: 558 nlmsg_end(skb, nlh); 559 return 0; 560 561 nla_put_failure: 562 nlmsg_cancel(skb, nlh); 563 return -EMSGSIZE; 564 } 565 566 void inet6_netconf_notify_devconf(struct net *net, int event, int type, 567 int ifindex, struct ipv6_devconf *devconf) 568 { 569 struct sk_buff *skb; 570 int err = -ENOBUFS; 571 572 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL); 573 if (!skb) 574 goto errout; 575 576 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 577 event, 0, type); 578 if (err < 0) { 579 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 580 WARN_ON(err == -EMSGSIZE); 581 kfree_skb(skb); 582 goto errout; 583 } 584 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL); 585 return; 586 errout: 587 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 588 } 589 590 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 591 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 592 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 593 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 594 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 595 }; 596 597 static int inet6_netconf_valid_get_req(struct sk_buff *skb, 598 const struct nlmsghdr *nlh, 599 struct nlattr **tb, 600 struct netlink_ext_ack *extack) 601 { 602 int i, err; 603 604 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) { 605 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request"); 606 return -EINVAL; 607 } 608 609 if (!netlink_strict_get_check(skb)) 610 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg), 611 tb, NETCONFA_MAX, 612 devconf_ipv6_policy, extack); 613 614 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg), 615 tb, NETCONFA_MAX, 616 devconf_ipv6_policy, extack); 617 if (err) 618 return err; 619 620 for (i = 0; i <= NETCONFA_MAX; i++) { 621 if (!tb[i]) 622 continue; 623 624 switch (i) { 625 case NETCONFA_IFINDEX: 626 break; 627 default: 628 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request"); 629 return -EINVAL; 630 } 631 } 632 633 return 0; 634 } 635 636 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 637 struct nlmsghdr *nlh, 638 struct netlink_ext_ack *extack) 639 { 640 struct net *net = sock_net(in_skb->sk); 641 struct nlattr *tb[NETCONFA_MAX+1]; 642 struct inet6_dev *in6_dev = NULL; 643 struct net_device *dev = NULL; 644 struct sk_buff *skb; 645 struct ipv6_devconf *devconf; 646 int ifindex; 647 int err; 648 649 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack); 650 if (err < 0) 651 return err; 652 653 if (!tb[NETCONFA_IFINDEX]) 654 return -EINVAL; 655 656 err = -EINVAL; 657 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 658 switch (ifindex) { 659 case NETCONFA_IFINDEX_ALL: 660 devconf = net->ipv6.devconf_all; 661 break; 662 case NETCONFA_IFINDEX_DEFAULT: 663 devconf = net->ipv6.devconf_dflt; 664 break; 665 default: 666 dev = dev_get_by_index(net, ifindex); 667 if (!dev) 668 return -EINVAL; 669 in6_dev = in6_dev_get(dev); 670 if (!in6_dev) 671 goto errout; 672 devconf = &in6_dev->cnf; 673 break; 674 } 675 676 err = -ENOBUFS; 677 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); 678 if (!skb) 679 goto errout; 680 681 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 682 NETLINK_CB(in_skb).portid, 683 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 684 NETCONFA_ALL); 685 if (err < 0) { 686 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 687 WARN_ON(err == -EMSGSIZE); 688 kfree_skb(skb); 689 goto errout; 690 } 691 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 692 errout: 693 if (in6_dev) 694 in6_dev_put(in6_dev); 695 if (dev) 696 dev_put(dev); 697 return err; 698 } 699 700 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 701 struct netlink_callback *cb) 702 { 703 const struct nlmsghdr *nlh = cb->nlh; 704 struct net *net = sock_net(skb->sk); 705 int h, s_h; 706 int idx, s_idx; 707 struct net_device *dev; 708 struct inet6_dev *idev; 709 struct hlist_head *head; 710 711 if (cb->strict_check) { 712 struct netlink_ext_ack *extack = cb->extack; 713 struct netconfmsg *ncm; 714 715 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) { 716 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request"); 717 return -EINVAL; 718 } 719 720 if (nlmsg_attrlen(nlh, sizeof(*ncm))) { 721 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request"); 722 return -EINVAL; 723 } 724 } 725 726 s_h = cb->args[0]; 727 s_idx = idx = cb->args[1]; 728 729 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 730 idx = 0; 731 head = &net->dev_index_head[h]; 732 rcu_read_lock(); 733 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 734 net->dev_base_seq; 735 hlist_for_each_entry_rcu(dev, head, index_hlist) { 736 if (idx < s_idx) 737 goto cont; 738 idev = __in6_dev_get(dev); 739 if (!idev) 740 goto cont; 741 742 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 743 &idev->cnf, 744 NETLINK_CB(cb->skb).portid, 745 nlh->nlmsg_seq, 746 RTM_NEWNETCONF, 747 NLM_F_MULTI, 748 NETCONFA_ALL) < 0) { 749 rcu_read_unlock(); 750 goto done; 751 } 752 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 753 cont: 754 idx++; 755 } 756 rcu_read_unlock(); 757 } 758 if (h == NETDEV_HASHENTRIES) { 759 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 760 net->ipv6.devconf_all, 761 NETLINK_CB(cb->skb).portid, 762 nlh->nlmsg_seq, 763 RTM_NEWNETCONF, NLM_F_MULTI, 764 NETCONFA_ALL) < 0) 765 goto done; 766 else 767 h++; 768 } 769 if (h == NETDEV_HASHENTRIES + 1) { 770 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 771 net->ipv6.devconf_dflt, 772 NETLINK_CB(cb->skb).portid, 773 nlh->nlmsg_seq, 774 RTM_NEWNETCONF, NLM_F_MULTI, 775 NETCONFA_ALL) < 0) 776 goto done; 777 else 778 h++; 779 } 780 done: 781 cb->args[0] = h; 782 cb->args[1] = idx; 783 784 return skb->len; 785 } 786 787 #ifdef CONFIG_SYSCTL 788 static void dev_forward_change(struct inet6_dev *idev) 789 { 790 struct net_device *dev; 791 struct inet6_ifaddr *ifa; 792 793 if (!idev) 794 return; 795 dev = idev->dev; 796 if (idev->cnf.forwarding) 797 dev_disable_lro(dev); 798 if (dev->flags & IFF_MULTICAST) { 799 if (idev->cnf.forwarding) { 800 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 801 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 802 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 803 } else { 804 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 805 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 806 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 807 } 808 } 809 810 list_for_each_entry(ifa, &idev->addr_list, if_list) { 811 if (ifa->flags&IFA_F_TENTATIVE) 812 continue; 813 if (idev->cnf.forwarding) 814 addrconf_join_anycast(ifa); 815 else 816 addrconf_leave_anycast(ifa); 817 } 818 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, 819 NETCONFA_FORWARDING, 820 dev->ifindex, &idev->cnf); 821 } 822 823 824 static void addrconf_forward_change(struct net *net, __s32 newf) 825 { 826 struct net_device *dev; 827 struct inet6_dev *idev; 828 829 for_each_netdev(net, dev) { 830 idev = __in6_dev_get(dev); 831 if (idev) { 832 int changed = (!idev->cnf.forwarding) ^ (!newf); 833 idev->cnf.forwarding = newf; 834 if (changed) 835 dev_forward_change(idev); 836 } 837 } 838 } 839 840 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 841 { 842 struct net *net; 843 int old; 844 845 if (!rtnl_trylock()) 846 return restart_syscall(); 847 848 net = (struct net *)table->extra2; 849 old = *p; 850 *p = newf; 851 852 if (p == &net->ipv6.devconf_dflt->forwarding) { 853 if ((!newf) ^ (!old)) 854 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 855 NETCONFA_FORWARDING, 856 NETCONFA_IFINDEX_DEFAULT, 857 net->ipv6.devconf_dflt); 858 rtnl_unlock(); 859 return 0; 860 } 861 862 if (p == &net->ipv6.devconf_all->forwarding) { 863 int old_dflt = net->ipv6.devconf_dflt->forwarding; 864 865 net->ipv6.devconf_dflt->forwarding = newf; 866 if ((!newf) ^ (!old_dflt)) 867 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 868 NETCONFA_FORWARDING, 869 NETCONFA_IFINDEX_DEFAULT, 870 net->ipv6.devconf_dflt); 871 872 addrconf_forward_change(net, newf); 873 if ((!newf) ^ (!old)) 874 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 875 NETCONFA_FORWARDING, 876 NETCONFA_IFINDEX_ALL, 877 net->ipv6.devconf_all); 878 } else if ((!newf) ^ (!old)) 879 dev_forward_change((struct inet6_dev *)table->extra1); 880 rtnl_unlock(); 881 882 if (newf) 883 rt6_purge_dflt_routers(net); 884 return 1; 885 } 886 887 static void addrconf_linkdown_change(struct net *net, __s32 newf) 888 { 889 struct net_device *dev; 890 struct inet6_dev *idev; 891 892 for_each_netdev(net, dev) { 893 idev = __in6_dev_get(dev); 894 if (idev) { 895 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 896 897 idev->cnf.ignore_routes_with_linkdown = newf; 898 if (changed) 899 inet6_netconf_notify_devconf(dev_net(dev), 900 RTM_NEWNETCONF, 901 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 902 dev->ifindex, 903 &idev->cnf); 904 } 905 } 906 } 907 908 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 909 { 910 struct net *net; 911 int old; 912 913 if (!rtnl_trylock()) 914 return restart_syscall(); 915 916 net = (struct net *)table->extra2; 917 old = *p; 918 *p = newf; 919 920 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 921 if ((!newf) ^ (!old)) 922 inet6_netconf_notify_devconf(net, 923 RTM_NEWNETCONF, 924 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 925 NETCONFA_IFINDEX_DEFAULT, 926 net->ipv6.devconf_dflt); 927 rtnl_unlock(); 928 return 0; 929 } 930 931 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 932 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 933 addrconf_linkdown_change(net, newf); 934 if ((!newf) ^ (!old)) 935 inet6_netconf_notify_devconf(net, 936 RTM_NEWNETCONF, 937 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 938 NETCONFA_IFINDEX_ALL, 939 net->ipv6.devconf_all); 940 } 941 rtnl_unlock(); 942 943 return 1; 944 } 945 946 #endif 947 948 /* Nobody refers to this ifaddr, destroy it */ 949 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 950 { 951 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 952 953 #ifdef NET_REFCNT_DEBUG 954 pr_debug("%s\n", __func__); 955 #endif 956 957 in6_dev_put(ifp->idev); 958 959 if (cancel_delayed_work(&ifp->dad_work)) 960 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 961 ifp); 962 963 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 964 pr_warn("Freeing alive inet6 address %p\n", ifp); 965 return; 966 } 967 968 kfree_rcu(ifp, rcu); 969 } 970 971 static void 972 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 973 { 974 struct list_head *p; 975 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 976 977 /* 978 * Each device address list is sorted in order of scope - 979 * global before linklocal. 980 */ 981 list_for_each(p, &idev->addr_list) { 982 struct inet6_ifaddr *ifa 983 = list_entry(p, struct inet6_ifaddr, if_list); 984 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 985 break; 986 } 987 988 list_add_tail_rcu(&ifp->if_list, p); 989 } 990 991 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr) 992 { 993 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net); 994 995 return hash_32(val, IN6_ADDR_HSIZE_SHIFT); 996 } 997 998 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 999 struct net_device *dev, unsigned int hash) 1000 { 1001 struct inet6_ifaddr *ifp; 1002 1003 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1004 if (!net_eq(dev_net(ifp->idev->dev), net)) 1005 continue; 1006 if (ipv6_addr_equal(&ifp->addr, addr)) { 1007 if (!dev || ifp->idev->dev == dev) 1008 return true; 1009 } 1010 } 1011 return false; 1012 } 1013 1014 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa) 1015 { 1016 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr); 1017 int err = 0; 1018 1019 spin_lock(&addrconf_hash_lock); 1020 1021 /* Ignore adding duplicate addresses on an interface */ 1022 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) { 1023 netdev_dbg(dev, "ipv6_add_addr: already assigned\n"); 1024 err = -EEXIST; 1025 } else { 1026 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 1027 } 1028 1029 spin_unlock(&addrconf_hash_lock); 1030 1031 return err; 1032 } 1033 1034 /* On success it returns ifp with increased reference count */ 1035 1036 static struct inet6_ifaddr * 1037 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg, 1038 bool can_block, struct netlink_ext_ack *extack) 1039 { 1040 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC; 1041 int addr_type = ipv6_addr_type(cfg->pfx); 1042 struct net *net = dev_net(idev->dev); 1043 struct inet6_ifaddr *ifa = NULL; 1044 struct fib6_info *f6i = NULL; 1045 int err = 0; 1046 1047 if (addr_type == IPV6_ADDR_ANY || 1048 (addr_type & IPV6_ADDR_MULTICAST && 1049 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) || 1050 (!(idev->dev->flags & IFF_LOOPBACK) && 1051 !netif_is_l3_master(idev->dev) && 1052 addr_type & IPV6_ADDR_LOOPBACK)) 1053 return ERR_PTR(-EADDRNOTAVAIL); 1054 1055 if (idev->dead) { 1056 err = -ENODEV; /*XXX*/ 1057 goto out; 1058 } 1059 1060 if (idev->cnf.disable_ipv6) { 1061 err = -EACCES; 1062 goto out; 1063 } 1064 1065 /* validator notifier needs to be blocking; 1066 * do not call in atomic context 1067 */ 1068 if (can_block) { 1069 struct in6_validator_info i6vi = { 1070 .i6vi_addr = *cfg->pfx, 1071 .i6vi_dev = idev, 1072 .extack = extack, 1073 }; 1074 1075 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi); 1076 err = notifier_to_errno(err); 1077 if (err < 0) 1078 goto out; 1079 } 1080 1081 ifa = kzalloc(sizeof(*ifa), gfp_flags); 1082 if (!ifa) { 1083 err = -ENOBUFS; 1084 goto out; 1085 } 1086 1087 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags); 1088 if (IS_ERR(f6i)) { 1089 err = PTR_ERR(f6i); 1090 f6i = NULL; 1091 goto out; 1092 } 1093 1094 if (net->ipv6.devconf_all->disable_policy || 1095 idev->cnf.disable_policy) 1096 f6i->dst_nopolicy = true; 1097 1098 neigh_parms_data_state_setall(idev->nd_parms); 1099 1100 ifa->addr = *cfg->pfx; 1101 if (cfg->peer_pfx) 1102 ifa->peer_addr = *cfg->peer_pfx; 1103 1104 spin_lock_init(&ifa->lock); 1105 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1106 INIT_HLIST_NODE(&ifa->addr_lst); 1107 ifa->scope = cfg->scope; 1108 ifa->prefix_len = cfg->plen; 1109 ifa->rt_priority = cfg->rt_priority; 1110 ifa->flags = cfg->ifa_flags; 1111 /* No need to add the TENTATIVE flag for addresses with NODAD */ 1112 if (!(cfg->ifa_flags & IFA_F_NODAD)) 1113 ifa->flags |= IFA_F_TENTATIVE; 1114 ifa->valid_lft = cfg->valid_lft; 1115 ifa->prefered_lft = cfg->preferred_lft; 1116 ifa->cstamp = ifa->tstamp = jiffies; 1117 ifa->tokenized = false; 1118 1119 ifa->rt = f6i; 1120 1121 ifa->idev = idev; 1122 in6_dev_hold(idev); 1123 1124 /* For caller */ 1125 refcount_set(&ifa->refcnt, 1); 1126 1127 rcu_read_lock_bh(); 1128 1129 err = ipv6_add_addr_hash(idev->dev, ifa); 1130 if (err < 0) { 1131 rcu_read_unlock_bh(); 1132 goto out; 1133 } 1134 1135 write_lock(&idev->lock); 1136 1137 /* Add to inet6_dev unicast addr list. */ 1138 ipv6_link_dev_addr(idev, ifa); 1139 1140 if (ifa->flags&IFA_F_TEMPORARY) { 1141 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1142 in6_ifa_hold(ifa); 1143 } 1144 1145 in6_ifa_hold(ifa); 1146 write_unlock(&idev->lock); 1147 1148 rcu_read_unlock_bh(); 1149 1150 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1151 out: 1152 if (unlikely(err < 0)) { 1153 fib6_info_release(f6i); 1154 1155 if (ifa) { 1156 if (ifa->idev) 1157 in6_dev_put(ifa->idev); 1158 kfree(ifa); 1159 } 1160 ifa = ERR_PTR(err); 1161 } 1162 1163 return ifa; 1164 } 1165 1166 enum cleanup_prefix_rt_t { 1167 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1168 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1169 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1170 }; 1171 1172 /* 1173 * Check, whether the prefix for ifp would still need a prefix route 1174 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1175 * constants. 1176 * 1177 * 1) we don't purge prefix if address was not permanent. 1178 * prefix is managed by its own lifetime. 1179 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1180 * 3) if there are no addresses, delete prefix. 1181 * 4) if there are still other permanent address(es), 1182 * corresponding prefix is still permanent. 1183 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1184 * don't purge the prefix, assume user space is managing it. 1185 * 6) otherwise, update prefix lifetime to the 1186 * longest valid lifetime among the corresponding 1187 * addresses on the device. 1188 * Note: subsequent RA will update lifetime. 1189 **/ 1190 static enum cleanup_prefix_rt_t 1191 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1192 { 1193 struct inet6_ifaddr *ifa; 1194 struct inet6_dev *idev = ifp->idev; 1195 unsigned long lifetime; 1196 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1197 1198 *expires = jiffies; 1199 1200 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1201 if (ifa == ifp) 1202 continue; 1203 if (ifa->prefix_len != ifp->prefix_len || 1204 !ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1205 ifp->prefix_len)) 1206 continue; 1207 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1208 return CLEANUP_PREFIX_RT_NOP; 1209 1210 action = CLEANUP_PREFIX_RT_EXPIRE; 1211 1212 spin_lock(&ifa->lock); 1213 1214 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1215 /* 1216 * Note: Because this address is 1217 * not permanent, lifetime < 1218 * LONG_MAX / HZ here. 1219 */ 1220 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1221 *expires = ifa->tstamp + lifetime * HZ; 1222 spin_unlock(&ifa->lock); 1223 } 1224 1225 return action; 1226 } 1227 1228 static void 1229 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, 1230 bool del_rt, bool del_peer) 1231 { 1232 struct fib6_info *f6i; 1233 1234 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr, 1235 ifp->prefix_len, 1236 ifp->idev->dev, 0, RTF_DEFAULT, true); 1237 if (f6i) { 1238 if (del_rt) 1239 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 1240 else { 1241 if (!(f6i->fib6_flags & RTF_EXPIRES)) 1242 fib6_set_expires(f6i, expires); 1243 fib6_info_release(f6i); 1244 } 1245 } 1246 } 1247 1248 1249 /* This function wants to get referenced ifp and releases it before return */ 1250 1251 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1252 { 1253 int state; 1254 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1255 unsigned long expires; 1256 1257 ASSERT_RTNL(); 1258 1259 spin_lock_bh(&ifp->lock); 1260 state = ifp->state; 1261 ifp->state = INET6_IFADDR_STATE_DEAD; 1262 spin_unlock_bh(&ifp->lock); 1263 1264 if (state == INET6_IFADDR_STATE_DEAD) 1265 goto out; 1266 1267 spin_lock_bh(&addrconf_hash_lock); 1268 hlist_del_init_rcu(&ifp->addr_lst); 1269 spin_unlock_bh(&addrconf_hash_lock); 1270 1271 write_lock_bh(&ifp->idev->lock); 1272 1273 if (ifp->flags&IFA_F_TEMPORARY) { 1274 list_del(&ifp->tmp_list); 1275 if (ifp->ifpub) { 1276 in6_ifa_put(ifp->ifpub); 1277 ifp->ifpub = NULL; 1278 } 1279 __in6_ifa_put(ifp); 1280 } 1281 1282 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1283 action = check_cleanup_prefix_route(ifp, &expires); 1284 1285 list_del_rcu(&ifp->if_list); 1286 __in6_ifa_put(ifp); 1287 1288 write_unlock_bh(&ifp->idev->lock); 1289 1290 addrconf_del_dad_work(ifp); 1291 1292 ipv6_ifa_notify(RTM_DELADDR, ifp); 1293 1294 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1295 1296 if (action != CLEANUP_PREFIX_RT_NOP) { 1297 cleanup_prefix_route(ifp, expires, 1298 action == CLEANUP_PREFIX_RT_DEL, false); 1299 } 1300 1301 /* clean up prefsrc entries */ 1302 rt6_remove_prefsrc(ifp); 1303 out: 1304 in6_ifa_put(ifp); 1305 } 1306 1307 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block) 1308 { 1309 struct inet6_dev *idev = ifp->idev; 1310 unsigned long tmp_tstamp, age; 1311 unsigned long regen_advance; 1312 unsigned long now = jiffies; 1313 s32 cnf_temp_preferred_lft; 1314 struct inet6_ifaddr *ift; 1315 struct ifa6_config cfg; 1316 long max_desync_factor; 1317 struct in6_addr addr; 1318 int ret = 0; 1319 1320 write_lock_bh(&idev->lock); 1321 1322 retry: 1323 in6_dev_hold(idev); 1324 if (idev->cnf.use_tempaddr <= 0) { 1325 write_unlock_bh(&idev->lock); 1326 pr_info("%s: use_tempaddr is disabled\n", __func__); 1327 in6_dev_put(idev); 1328 ret = -1; 1329 goto out; 1330 } 1331 spin_lock_bh(&ifp->lock); 1332 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1333 idev->cnf.use_tempaddr = -1; /*XXX*/ 1334 spin_unlock_bh(&ifp->lock); 1335 write_unlock_bh(&idev->lock); 1336 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1337 __func__); 1338 in6_dev_put(idev); 1339 ret = -1; 1340 goto out; 1341 } 1342 in6_ifa_hold(ifp); 1343 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1344 ipv6_gen_rnd_iid(&addr); 1345 1346 age = (now - ifp->tstamp) / HZ; 1347 1348 regen_advance = idev->cnf.regen_max_retry * 1349 idev->cnf.dad_transmits * 1350 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 1351 1352 /* recalculate max_desync_factor each time and update 1353 * idev->desync_factor if it's larger 1354 */ 1355 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1356 max_desync_factor = min_t(__u32, 1357 idev->cnf.max_desync_factor, 1358 cnf_temp_preferred_lft - regen_advance); 1359 1360 if (unlikely(idev->desync_factor > max_desync_factor)) { 1361 if (max_desync_factor > 0) { 1362 get_random_bytes(&idev->desync_factor, 1363 sizeof(idev->desync_factor)); 1364 idev->desync_factor %= max_desync_factor; 1365 } else { 1366 idev->desync_factor = 0; 1367 } 1368 } 1369 1370 memset(&cfg, 0, sizeof(cfg)); 1371 cfg.valid_lft = min_t(__u32, ifp->valid_lft, 1372 idev->cnf.temp_valid_lft + age); 1373 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor; 1374 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft); 1375 1376 cfg.plen = ifp->prefix_len; 1377 tmp_tstamp = ifp->tstamp; 1378 spin_unlock_bh(&ifp->lock); 1379 1380 write_unlock_bh(&idev->lock); 1381 1382 /* A temporary address is created only if this calculated Preferred 1383 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1384 * an implementation must not create a temporary address with a zero 1385 * Preferred Lifetime. 1386 * Use age calculation as in addrconf_verify to avoid unnecessary 1387 * temporary addresses being generated. 1388 */ 1389 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1390 if (cfg.preferred_lft <= regen_advance + age) { 1391 in6_ifa_put(ifp); 1392 in6_dev_put(idev); 1393 ret = -1; 1394 goto out; 1395 } 1396 1397 cfg.ifa_flags = IFA_F_TEMPORARY; 1398 /* set in addrconf_prefix_rcv() */ 1399 if (ifp->flags & IFA_F_OPTIMISTIC) 1400 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 1401 1402 cfg.pfx = &addr; 1403 cfg.scope = ipv6_addr_scope(cfg.pfx); 1404 1405 ift = ipv6_add_addr(idev, &cfg, block, NULL); 1406 if (IS_ERR(ift)) { 1407 in6_ifa_put(ifp); 1408 in6_dev_put(idev); 1409 pr_info("%s: retry temporary address regeneration\n", __func__); 1410 write_lock_bh(&idev->lock); 1411 goto retry; 1412 } 1413 1414 spin_lock_bh(&ift->lock); 1415 ift->ifpub = ifp; 1416 ift->cstamp = now; 1417 ift->tstamp = tmp_tstamp; 1418 spin_unlock_bh(&ift->lock); 1419 1420 addrconf_dad_start(ift); 1421 in6_ifa_put(ift); 1422 in6_dev_put(idev); 1423 out: 1424 return ret; 1425 } 1426 1427 /* 1428 * Choose an appropriate source address (RFC3484) 1429 */ 1430 enum { 1431 IPV6_SADDR_RULE_INIT = 0, 1432 IPV6_SADDR_RULE_LOCAL, 1433 IPV6_SADDR_RULE_SCOPE, 1434 IPV6_SADDR_RULE_PREFERRED, 1435 #ifdef CONFIG_IPV6_MIP6 1436 IPV6_SADDR_RULE_HOA, 1437 #endif 1438 IPV6_SADDR_RULE_OIF, 1439 IPV6_SADDR_RULE_LABEL, 1440 IPV6_SADDR_RULE_PRIVACY, 1441 IPV6_SADDR_RULE_ORCHID, 1442 IPV6_SADDR_RULE_PREFIX, 1443 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1444 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1445 #endif 1446 IPV6_SADDR_RULE_MAX 1447 }; 1448 1449 struct ipv6_saddr_score { 1450 int rule; 1451 int addr_type; 1452 struct inet6_ifaddr *ifa; 1453 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1454 int scopedist; 1455 int matchlen; 1456 }; 1457 1458 struct ipv6_saddr_dst { 1459 const struct in6_addr *addr; 1460 int ifindex; 1461 int scope; 1462 int label; 1463 unsigned int prefs; 1464 }; 1465 1466 static inline int ipv6_saddr_preferred(int type) 1467 { 1468 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1469 return 1; 1470 return 0; 1471 } 1472 1473 static bool ipv6_use_optimistic_addr(struct net *net, 1474 struct inet6_dev *idev) 1475 { 1476 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1477 if (!idev) 1478 return false; 1479 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1480 return false; 1481 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic) 1482 return false; 1483 1484 return true; 1485 #else 1486 return false; 1487 #endif 1488 } 1489 1490 static bool ipv6_allow_optimistic_dad(struct net *net, 1491 struct inet6_dev *idev) 1492 { 1493 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1494 if (!idev) 1495 return false; 1496 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1497 return false; 1498 1499 return true; 1500 #else 1501 return false; 1502 #endif 1503 } 1504 1505 static int ipv6_get_saddr_eval(struct net *net, 1506 struct ipv6_saddr_score *score, 1507 struct ipv6_saddr_dst *dst, 1508 int i) 1509 { 1510 int ret; 1511 1512 if (i <= score->rule) { 1513 switch (i) { 1514 case IPV6_SADDR_RULE_SCOPE: 1515 ret = score->scopedist; 1516 break; 1517 case IPV6_SADDR_RULE_PREFIX: 1518 ret = score->matchlen; 1519 break; 1520 default: 1521 ret = !!test_bit(i, score->scorebits); 1522 } 1523 goto out; 1524 } 1525 1526 switch (i) { 1527 case IPV6_SADDR_RULE_INIT: 1528 /* Rule 0: remember if hiscore is not ready yet */ 1529 ret = !!score->ifa; 1530 break; 1531 case IPV6_SADDR_RULE_LOCAL: 1532 /* Rule 1: Prefer same address */ 1533 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1534 break; 1535 case IPV6_SADDR_RULE_SCOPE: 1536 /* Rule 2: Prefer appropriate scope 1537 * 1538 * ret 1539 * ^ 1540 * -1 | d 15 1541 * ---+--+-+---> scope 1542 * | 1543 * | d is scope of the destination. 1544 * B-d | \ 1545 * | \ <- smaller scope is better if 1546 * B-15 | \ if scope is enough for destination. 1547 * | ret = B - scope (-1 <= scope >= d <= 15). 1548 * d-C-1 | / 1549 * |/ <- greater is better 1550 * -C / if scope is not enough for destination. 1551 * /| ret = scope - C (-1 <= d < scope <= 15). 1552 * 1553 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1554 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1555 * Assume B = 0 and we get C > 29. 1556 */ 1557 ret = __ipv6_addr_src_scope(score->addr_type); 1558 if (ret >= dst->scope) 1559 ret = -ret; 1560 else 1561 ret -= 128; /* 30 is enough */ 1562 score->scopedist = ret; 1563 break; 1564 case IPV6_SADDR_RULE_PREFERRED: 1565 { 1566 /* Rule 3: Avoid deprecated and optimistic addresses */ 1567 u8 avoid = IFA_F_DEPRECATED; 1568 1569 if (!ipv6_use_optimistic_addr(net, score->ifa->idev)) 1570 avoid |= IFA_F_OPTIMISTIC; 1571 ret = ipv6_saddr_preferred(score->addr_type) || 1572 !(score->ifa->flags & avoid); 1573 break; 1574 } 1575 #ifdef CONFIG_IPV6_MIP6 1576 case IPV6_SADDR_RULE_HOA: 1577 { 1578 /* Rule 4: Prefer home address */ 1579 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1580 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1581 break; 1582 } 1583 #endif 1584 case IPV6_SADDR_RULE_OIF: 1585 /* Rule 5: Prefer outgoing interface */ 1586 ret = (!dst->ifindex || 1587 dst->ifindex == score->ifa->idev->dev->ifindex); 1588 break; 1589 case IPV6_SADDR_RULE_LABEL: 1590 /* Rule 6: Prefer matching label */ 1591 ret = ipv6_addr_label(net, 1592 &score->ifa->addr, score->addr_type, 1593 score->ifa->idev->dev->ifindex) == dst->label; 1594 break; 1595 case IPV6_SADDR_RULE_PRIVACY: 1596 { 1597 /* Rule 7: Prefer public address 1598 * Note: prefer temporary address if use_tempaddr >= 2 1599 */ 1600 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1601 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1602 score->ifa->idev->cnf.use_tempaddr >= 2; 1603 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1604 break; 1605 } 1606 case IPV6_SADDR_RULE_ORCHID: 1607 /* Rule 8-: Prefer ORCHID vs ORCHID or 1608 * non-ORCHID vs non-ORCHID 1609 */ 1610 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1611 ipv6_addr_orchid(dst->addr)); 1612 break; 1613 case IPV6_SADDR_RULE_PREFIX: 1614 /* Rule 8: Use longest matching prefix */ 1615 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1616 if (ret > score->ifa->prefix_len) 1617 ret = score->ifa->prefix_len; 1618 score->matchlen = ret; 1619 break; 1620 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1621 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1622 /* Optimistic addresses still have lower precedence than other 1623 * preferred addresses. 1624 */ 1625 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1626 break; 1627 #endif 1628 default: 1629 ret = 0; 1630 } 1631 1632 if (ret) 1633 __set_bit(i, score->scorebits); 1634 score->rule = i; 1635 out: 1636 return ret; 1637 } 1638 1639 static int __ipv6_dev_get_saddr(struct net *net, 1640 struct ipv6_saddr_dst *dst, 1641 struct inet6_dev *idev, 1642 struct ipv6_saddr_score *scores, 1643 int hiscore_idx) 1644 { 1645 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1646 1647 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) { 1648 int i; 1649 1650 /* 1651 * - Tentative Address (RFC2462 section 5.4) 1652 * - A tentative address is not considered 1653 * "assigned to an interface" in the traditional 1654 * sense, unless it is also flagged as optimistic. 1655 * - Candidate Source Address (section 4) 1656 * - In any case, anycast addresses, multicast 1657 * addresses, and the unspecified address MUST 1658 * NOT be included in a candidate set. 1659 */ 1660 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1661 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1662 continue; 1663 1664 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1665 1666 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1667 score->addr_type & IPV6_ADDR_MULTICAST)) { 1668 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1669 idev->dev->name); 1670 continue; 1671 } 1672 1673 score->rule = -1; 1674 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1675 1676 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1677 int minihiscore, miniscore; 1678 1679 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1680 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1681 1682 if (minihiscore > miniscore) { 1683 if (i == IPV6_SADDR_RULE_SCOPE && 1684 score->scopedist > 0) { 1685 /* 1686 * special case: 1687 * each remaining entry 1688 * has too small (not enough) 1689 * scope, because ifa entries 1690 * are sorted by their scope 1691 * values. 1692 */ 1693 goto out; 1694 } 1695 break; 1696 } else if (minihiscore < miniscore) { 1697 swap(hiscore, score); 1698 hiscore_idx = 1 - hiscore_idx; 1699 1700 /* restore our iterator */ 1701 score->ifa = hiscore->ifa; 1702 1703 break; 1704 } 1705 } 1706 } 1707 out: 1708 return hiscore_idx; 1709 } 1710 1711 static int ipv6_get_saddr_master(struct net *net, 1712 const struct net_device *dst_dev, 1713 const struct net_device *master, 1714 struct ipv6_saddr_dst *dst, 1715 struct ipv6_saddr_score *scores, 1716 int hiscore_idx) 1717 { 1718 struct inet6_dev *idev; 1719 1720 idev = __in6_dev_get(dst_dev); 1721 if (idev) 1722 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1723 scores, hiscore_idx); 1724 1725 idev = __in6_dev_get(master); 1726 if (idev) 1727 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1728 scores, hiscore_idx); 1729 1730 return hiscore_idx; 1731 } 1732 1733 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1734 const struct in6_addr *daddr, unsigned int prefs, 1735 struct in6_addr *saddr) 1736 { 1737 struct ipv6_saddr_score scores[2], *hiscore; 1738 struct ipv6_saddr_dst dst; 1739 struct inet6_dev *idev; 1740 struct net_device *dev; 1741 int dst_type; 1742 bool use_oif_addr = false; 1743 int hiscore_idx = 0; 1744 int ret = 0; 1745 1746 dst_type = __ipv6_addr_type(daddr); 1747 dst.addr = daddr; 1748 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1749 dst.scope = __ipv6_addr_src_scope(dst_type); 1750 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1751 dst.prefs = prefs; 1752 1753 scores[hiscore_idx].rule = -1; 1754 scores[hiscore_idx].ifa = NULL; 1755 1756 rcu_read_lock(); 1757 1758 /* Candidate Source Address (section 4) 1759 * - multicast and link-local destination address, 1760 * the set of candidate source address MUST only 1761 * include addresses assigned to interfaces 1762 * belonging to the same link as the outgoing 1763 * interface. 1764 * (- For site-local destination addresses, the 1765 * set of candidate source addresses MUST only 1766 * include addresses assigned to interfaces 1767 * belonging to the same site as the outgoing 1768 * interface.) 1769 * - "It is RECOMMENDED that the candidate source addresses 1770 * be the set of unicast addresses assigned to the 1771 * interface that will be used to send to the destination 1772 * (the 'outgoing' interface)." (RFC 6724) 1773 */ 1774 if (dst_dev) { 1775 idev = __in6_dev_get(dst_dev); 1776 if ((dst_type & IPV6_ADDR_MULTICAST) || 1777 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1778 (idev && idev->cnf.use_oif_addrs_only)) { 1779 use_oif_addr = true; 1780 } 1781 } 1782 1783 if (use_oif_addr) { 1784 if (idev) 1785 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1786 } else { 1787 const struct net_device *master; 1788 int master_idx = 0; 1789 1790 /* if dst_dev exists and is enslaved to an L3 device, then 1791 * prefer addresses from dst_dev and then the master over 1792 * any other enslaved devices in the L3 domain. 1793 */ 1794 master = l3mdev_master_dev_rcu(dst_dev); 1795 if (master) { 1796 master_idx = master->ifindex; 1797 1798 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1799 master, &dst, 1800 scores, hiscore_idx); 1801 1802 if (scores[hiscore_idx].ifa) 1803 goto out; 1804 } 1805 1806 for_each_netdev_rcu(net, dev) { 1807 /* only consider addresses on devices in the 1808 * same L3 domain 1809 */ 1810 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1811 continue; 1812 idev = __in6_dev_get(dev); 1813 if (!idev) 1814 continue; 1815 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1816 } 1817 } 1818 1819 out: 1820 hiscore = &scores[hiscore_idx]; 1821 if (!hiscore->ifa) 1822 ret = -EADDRNOTAVAIL; 1823 else 1824 *saddr = hiscore->ifa->addr; 1825 1826 rcu_read_unlock(); 1827 return ret; 1828 } 1829 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1830 1831 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1832 u32 banned_flags) 1833 { 1834 struct inet6_ifaddr *ifp; 1835 int err = -EADDRNOTAVAIL; 1836 1837 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1838 if (ifp->scope > IFA_LINK) 1839 break; 1840 if (ifp->scope == IFA_LINK && 1841 !(ifp->flags & banned_flags)) { 1842 *addr = ifp->addr; 1843 err = 0; 1844 break; 1845 } 1846 } 1847 return err; 1848 } 1849 1850 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1851 u32 banned_flags) 1852 { 1853 struct inet6_dev *idev; 1854 int err = -EADDRNOTAVAIL; 1855 1856 rcu_read_lock(); 1857 idev = __in6_dev_get(dev); 1858 if (idev) { 1859 read_lock_bh(&idev->lock); 1860 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1861 read_unlock_bh(&idev->lock); 1862 } 1863 rcu_read_unlock(); 1864 return err; 1865 } 1866 1867 static int ipv6_count_addresses(const struct inet6_dev *idev) 1868 { 1869 const struct inet6_ifaddr *ifp; 1870 int cnt = 0; 1871 1872 rcu_read_lock(); 1873 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list) 1874 cnt++; 1875 rcu_read_unlock(); 1876 return cnt; 1877 } 1878 1879 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1880 const struct net_device *dev, int strict) 1881 { 1882 return ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1883 strict, IFA_F_TENTATIVE); 1884 } 1885 EXPORT_SYMBOL(ipv6_chk_addr); 1886 1887 /* device argument is used to find the L3 domain of interest. If 1888 * skip_dev_check is set, then the ifp device is not checked against 1889 * the passed in dev argument. So the 2 cases for addresses checks are: 1890 * 1. does the address exist in the L3 domain that dev is part of 1891 * (skip_dev_check = true), or 1892 * 1893 * 2. does the address exist on the specific device 1894 * (skip_dev_check = false) 1895 */ 1896 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1897 const struct net_device *dev, bool skip_dev_check, 1898 int strict, u32 banned_flags) 1899 { 1900 unsigned int hash = inet6_addr_hash(net, addr); 1901 const struct net_device *l3mdev; 1902 struct inet6_ifaddr *ifp; 1903 u32 ifp_flags; 1904 1905 rcu_read_lock(); 1906 1907 l3mdev = l3mdev_master_dev_rcu(dev); 1908 if (skip_dev_check) 1909 dev = NULL; 1910 1911 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1912 if (!net_eq(dev_net(ifp->idev->dev), net)) 1913 continue; 1914 1915 if (l3mdev_master_dev_rcu(ifp->idev->dev) != l3mdev) 1916 continue; 1917 1918 /* Decouple optimistic from tentative for evaluation here. 1919 * Ban optimistic addresses explicitly, when required. 1920 */ 1921 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1922 ? (ifp->flags&~IFA_F_TENTATIVE) 1923 : ifp->flags; 1924 if (ipv6_addr_equal(&ifp->addr, addr) && 1925 !(ifp_flags&banned_flags) && 1926 (!dev || ifp->idev->dev == dev || 1927 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1928 rcu_read_unlock(); 1929 return 1; 1930 } 1931 } 1932 1933 rcu_read_unlock(); 1934 return 0; 1935 } 1936 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1937 1938 1939 /* Compares an address/prefix_len with addresses on device @dev. 1940 * If one is found it returns true. 1941 */ 1942 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1943 const unsigned int prefix_len, struct net_device *dev) 1944 { 1945 const struct inet6_ifaddr *ifa; 1946 const struct inet6_dev *idev; 1947 bool ret = false; 1948 1949 rcu_read_lock(); 1950 idev = __in6_dev_get(dev); 1951 if (idev) { 1952 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1953 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1954 if (ret) 1955 break; 1956 } 1957 } 1958 rcu_read_unlock(); 1959 1960 return ret; 1961 } 1962 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1963 1964 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1965 { 1966 const struct inet6_ifaddr *ifa; 1967 const struct inet6_dev *idev; 1968 int onlink; 1969 1970 onlink = 0; 1971 rcu_read_lock(); 1972 idev = __in6_dev_get(dev); 1973 if (idev) { 1974 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1975 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1976 ifa->prefix_len); 1977 if (onlink) 1978 break; 1979 } 1980 } 1981 rcu_read_unlock(); 1982 return onlink; 1983 } 1984 EXPORT_SYMBOL(ipv6_chk_prefix); 1985 1986 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1987 struct net_device *dev, int strict) 1988 { 1989 unsigned int hash = inet6_addr_hash(net, addr); 1990 struct inet6_ifaddr *ifp, *result = NULL; 1991 1992 rcu_read_lock(); 1993 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1994 if (!net_eq(dev_net(ifp->idev->dev), net)) 1995 continue; 1996 if (ipv6_addr_equal(&ifp->addr, addr)) { 1997 if (!dev || ifp->idev->dev == dev || 1998 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1999 result = ifp; 2000 in6_ifa_hold(ifp); 2001 break; 2002 } 2003 } 2004 } 2005 rcu_read_unlock(); 2006 2007 return result; 2008 } 2009 2010 /* Gets referenced address, destroys ifaddr */ 2011 2012 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 2013 { 2014 if (dad_failed) 2015 ifp->flags |= IFA_F_DADFAILED; 2016 2017 if (ifp->flags&IFA_F_TEMPORARY) { 2018 struct inet6_ifaddr *ifpub; 2019 spin_lock_bh(&ifp->lock); 2020 ifpub = ifp->ifpub; 2021 if (ifpub) { 2022 in6_ifa_hold(ifpub); 2023 spin_unlock_bh(&ifp->lock); 2024 ipv6_create_tempaddr(ifpub, true); 2025 in6_ifa_put(ifpub); 2026 } else { 2027 spin_unlock_bh(&ifp->lock); 2028 } 2029 ipv6_del_addr(ifp); 2030 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) { 2031 spin_lock_bh(&ifp->lock); 2032 addrconf_del_dad_work(ifp); 2033 ifp->flags |= IFA_F_TENTATIVE; 2034 if (dad_failed) 2035 ifp->flags &= ~IFA_F_OPTIMISTIC; 2036 spin_unlock_bh(&ifp->lock); 2037 if (dad_failed) 2038 ipv6_ifa_notify(0, ifp); 2039 in6_ifa_put(ifp); 2040 } else { 2041 ipv6_del_addr(ifp); 2042 } 2043 } 2044 2045 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 2046 { 2047 int err = -ENOENT; 2048 2049 spin_lock_bh(&ifp->lock); 2050 if (ifp->state == INET6_IFADDR_STATE_DAD) { 2051 ifp->state = INET6_IFADDR_STATE_POSTDAD; 2052 err = 0; 2053 } 2054 spin_unlock_bh(&ifp->lock); 2055 2056 return err; 2057 } 2058 2059 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp) 2060 { 2061 struct inet6_dev *idev = ifp->idev; 2062 struct net *net = dev_net(ifp->idev->dev); 2063 2064 if (addrconf_dad_end(ifp)) { 2065 in6_ifa_put(ifp); 2066 return; 2067 } 2068 2069 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n", 2070 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source); 2071 2072 spin_lock_bh(&ifp->lock); 2073 2074 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 2075 struct in6_addr new_addr; 2076 struct inet6_ifaddr *ifp2; 2077 int retries = ifp->stable_privacy_retry + 1; 2078 struct ifa6_config cfg = { 2079 .pfx = &new_addr, 2080 .plen = ifp->prefix_len, 2081 .ifa_flags = ifp->flags, 2082 .valid_lft = ifp->valid_lft, 2083 .preferred_lft = ifp->prefered_lft, 2084 .scope = ifp->scope, 2085 }; 2086 2087 if (retries > net->ipv6.sysctl.idgen_retries) { 2088 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 2089 ifp->idev->dev->name); 2090 goto errdad; 2091 } 2092 2093 new_addr = ifp->addr; 2094 if (ipv6_generate_stable_address(&new_addr, retries, 2095 idev)) 2096 goto errdad; 2097 2098 spin_unlock_bh(&ifp->lock); 2099 2100 if (idev->cnf.max_addresses && 2101 ipv6_count_addresses(idev) >= 2102 idev->cnf.max_addresses) 2103 goto lock_errdad; 2104 2105 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 2106 ifp->idev->dev->name); 2107 2108 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL); 2109 if (IS_ERR(ifp2)) 2110 goto lock_errdad; 2111 2112 spin_lock_bh(&ifp2->lock); 2113 ifp2->stable_privacy_retry = retries; 2114 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2115 spin_unlock_bh(&ifp2->lock); 2116 2117 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2118 in6_ifa_put(ifp2); 2119 lock_errdad: 2120 spin_lock_bh(&ifp->lock); 2121 } 2122 2123 errdad: 2124 /* transition from _POSTDAD to _ERRDAD */ 2125 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2126 spin_unlock_bh(&ifp->lock); 2127 2128 addrconf_mod_dad_work(ifp, 0); 2129 in6_ifa_put(ifp); 2130 } 2131 2132 /* Join to solicited addr multicast group. 2133 * caller must hold RTNL */ 2134 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2135 { 2136 struct in6_addr maddr; 2137 2138 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2139 return; 2140 2141 addrconf_addr_solict_mult(addr, &maddr); 2142 ipv6_dev_mc_inc(dev, &maddr); 2143 } 2144 2145 /* caller must hold RTNL */ 2146 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2147 { 2148 struct in6_addr maddr; 2149 2150 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2151 return; 2152 2153 addrconf_addr_solict_mult(addr, &maddr); 2154 __ipv6_dev_mc_dec(idev, &maddr); 2155 } 2156 2157 /* caller must hold RTNL */ 2158 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2159 { 2160 struct in6_addr addr; 2161 2162 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2163 return; 2164 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2165 if (ipv6_addr_any(&addr)) 2166 return; 2167 __ipv6_dev_ac_inc(ifp->idev, &addr); 2168 } 2169 2170 /* caller must hold RTNL */ 2171 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2172 { 2173 struct in6_addr addr; 2174 2175 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2176 return; 2177 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2178 if (ipv6_addr_any(&addr)) 2179 return; 2180 __ipv6_dev_ac_dec(ifp->idev, &addr); 2181 } 2182 2183 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2184 { 2185 switch (dev->addr_len) { 2186 case ETH_ALEN: 2187 memcpy(eui, dev->dev_addr, 3); 2188 eui[3] = 0xFF; 2189 eui[4] = 0xFE; 2190 memcpy(eui + 5, dev->dev_addr + 3, 3); 2191 break; 2192 case EUI64_ADDR_LEN: 2193 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2194 eui[0] ^= 2; 2195 break; 2196 default: 2197 return -1; 2198 } 2199 2200 return 0; 2201 } 2202 2203 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2204 { 2205 union fwnet_hwaddr *ha; 2206 2207 if (dev->addr_len != FWNET_ALEN) 2208 return -1; 2209 2210 ha = (union fwnet_hwaddr *)dev->dev_addr; 2211 2212 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2213 eui[0] ^= 2; 2214 return 0; 2215 } 2216 2217 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2218 { 2219 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2220 if (dev->addr_len != ARCNET_ALEN) 2221 return -1; 2222 memset(eui, 0, 7); 2223 eui[7] = *(u8 *)dev->dev_addr; 2224 return 0; 2225 } 2226 2227 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2228 { 2229 if (dev->addr_len != INFINIBAND_ALEN) 2230 return -1; 2231 memcpy(eui, dev->dev_addr + 12, 8); 2232 eui[0] |= 2; 2233 return 0; 2234 } 2235 2236 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2237 { 2238 if (addr == 0) 2239 return -1; 2240 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2241 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2242 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2243 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2244 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2245 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2246 eui[1] = 0; 2247 eui[2] = 0x5E; 2248 eui[3] = 0xFE; 2249 memcpy(eui + 4, &addr, 4); 2250 return 0; 2251 } 2252 2253 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2254 { 2255 if (dev->priv_flags & IFF_ISATAP) 2256 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2257 return -1; 2258 } 2259 2260 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2261 { 2262 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2263 } 2264 2265 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2266 { 2267 memcpy(eui, dev->perm_addr, 3); 2268 memcpy(eui + 5, dev->perm_addr + 3, 3); 2269 eui[3] = 0xFF; 2270 eui[4] = 0xFE; 2271 eui[0] ^= 2; 2272 return 0; 2273 } 2274 2275 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2276 { 2277 switch (dev->type) { 2278 case ARPHRD_ETHER: 2279 case ARPHRD_FDDI: 2280 return addrconf_ifid_eui48(eui, dev); 2281 case ARPHRD_ARCNET: 2282 return addrconf_ifid_arcnet(eui, dev); 2283 case ARPHRD_INFINIBAND: 2284 return addrconf_ifid_infiniband(eui, dev); 2285 case ARPHRD_SIT: 2286 return addrconf_ifid_sit(eui, dev); 2287 case ARPHRD_IPGRE: 2288 case ARPHRD_TUNNEL: 2289 return addrconf_ifid_gre(eui, dev); 2290 case ARPHRD_6LOWPAN: 2291 return addrconf_ifid_6lowpan(eui, dev); 2292 case ARPHRD_IEEE1394: 2293 return addrconf_ifid_ieee1394(eui, dev); 2294 case ARPHRD_TUNNEL6: 2295 case ARPHRD_IP6GRE: 2296 case ARPHRD_RAWIP: 2297 return addrconf_ifid_ip6tnl(eui, dev); 2298 } 2299 return -1; 2300 } 2301 2302 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2303 { 2304 int err = -1; 2305 struct inet6_ifaddr *ifp; 2306 2307 read_lock_bh(&idev->lock); 2308 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2309 if (ifp->scope > IFA_LINK) 2310 break; 2311 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2312 memcpy(eui, ifp->addr.s6_addr+8, 8); 2313 err = 0; 2314 break; 2315 } 2316 } 2317 read_unlock_bh(&idev->lock); 2318 return err; 2319 } 2320 2321 /* Generation of a randomized Interface Identifier 2322 * draft-ietf-6man-rfc4941bis, Section 3.3.1 2323 */ 2324 2325 static void ipv6_gen_rnd_iid(struct in6_addr *addr) 2326 { 2327 regen: 2328 get_random_bytes(&addr->s6_addr[8], 8); 2329 2330 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1: 2331 * check if generated address is not inappropriate: 2332 * 2333 * - Reserved IPv6 Interface Identifers 2334 * - XXX: already assigned to an address on the device 2335 */ 2336 2337 /* Subnet-router anycast: 0000:0000:0000:0000 */ 2338 if (!(addr->s6_addr32[2] | addr->s6_addr32[3])) 2339 goto regen; 2340 2341 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212 2342 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213 2343 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF 2344 */ 2345 if (ntohl(addr->s6_addr32[2]) == 0x02005eff && 2346 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000) 2347 goto regen; 2348 2349 /* Reserved subnet anycast addresses */ 2350 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff && 2351 ntohl(addr->s6_addr32[3]) >= 0Xffffff80) 2352 goto regen; 2353 } 2354 2355 /* 2356 * Add prefix route. 2357 */ 2358 2359 static void 2360 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric, 2361 struct net_device *dev, unsigned long expires, 2362 u32 flags, gfp_t gfp_flags) 2363 { 2364 struct fib6_config cfg = { 2365 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2366 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF, 2367 .fc_ifindex = dev->ifindex, 2368 .fc_expires = expires, 2369 .fc_dst_len = plen, 2370 .fc_flags = RTF_UP | flags, 2371 .fc_nlinfo.nl_net = dev_net(dev), 2372 .fc_protocol = RTPROT_KERNEL, 2373 .fc_type = RTN_UNICAST, 2374 }; 2375 2376 cfg.fc_dst = *pfx; 2377 2378 /* Prevent useless cloning on PtP SIT. 2379 This thing is done here expecting that the whole 2380 class of non-broadcast devices need not cloning. 2381 */ 2382 #if IS_ENABLED(CONFIG_IPV6_SIT) 2383 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2384 cfg.fc_flags |= RTF_NONEXTHOP; 2385 #endif 2386 2387 ip6_route_add(&cfg, gfp_flags, NULL); 2388 } 2389 2390 2391 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2392 int plen, 2393 const struct net_device *dev, 2394 u32 flags, u32 noflags, 2395 bool no_gw) 2396 { 2397 struct fib6_node *fn; 2398 struct fib6_info *rt = NULL; 2399 struct fib6_table *table; 2400 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2401 2402 table = fib6_get_table(dev_net(dev), tb_id); 2403 if (!table) 2404 return NULL; 2405 2406 rcu_read_lock(); 2407 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true); 2408 if (!fn) 2409 goto out; 2410 2411 for_each_fib6_node_rt_rcu(fn) { 2412 /* prefix routes only use builtin fib6_nh */ 2413 if (rt->nh) 2414 continue; 2415 2416 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex) 2417 continue; 2418 if (no_gw && rt->fib6_nh->fib_nh_gw_family) 2419 continue; 2420 if ((rt->fib6_flags & flags) != flags) 2421 continue; 2422 if ((rt->fib6_flags & noflags) != 0) 2423 continue; 2424 if (!fib6_info_hold_safe(rt)) 2425 continue; 2426 break; 2427 } 2428 out: 2429 rcu_read_unlock(); 2430 return rt; 2431 } 2432 2433 2434 /* Create "default" multicast route to the interface */ 2435 2436 static void addrconf_add_mroute(struct net_device *dev) 2437 { 2438 struct fib6_config cfg = { 2439 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2440 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2441 .fc_ifindex = dev->ifindex, 2442 .fc_dst_len = 8, 2443 .fc_flags = RTF_UP, 2444 .fc_type = RTN_UNICAST, 2445 .fc_nlinfo.nl_net = dev_net(dev), 2446 }; 2447 2448 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2449 2450 ip6_route_add(&cfg, GFP_KERNEL, NULL); 2451 } 2452 2453 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2454 { 2455 struct inet6_dev *idev; 2456 2457 ASSERT_RTNL(); 2458 2459 idev = ipv6_find_idev(dev); 2460 if (IS_ERR(idev)) 2461 return idev; 2462 2463 if (idev->cnf.disable_ipv6) 2464 return ERR_PTR(-EACCES); 2465 2466 /* Add default multicast route */ 2467 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2468 addrconf_add_mroute(dev); 2469 2470 return idev; 2471 } 2472 2473 static void manage_tempaddrs(struct inet6_dev *idev, 2474 struct inet6_ifaddr *ifp, 2475 __u32 valid_lft, __u32 prefered_lft, 2476 bool create, unsigned long now) 2477 { 2478 u32 flags; 2479 struct inet6_ifaddr *ift; 2480 2481 read_lock_bh(&idev->lock); 2482 /* update all temporary addresses in the list */ 2483 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2484 int age, max_valid, max_prefered; 2485 2486 if (ifp != ift->ifpub) 2487 continue; 2488 2489 /* RFC 4941 section 3.3: 2490 * If a received option will extend the lifetime of a public 2491 * address, the lifetimes of temporary addresses should 2492 * be extended, subject to the overall constraint that no 2493 * temporary addresses should ever remain "valid" or "preferred" 2494 * for a time longer than (TEMP_VALID_LIFETIME) or 2495 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2496 */ 2497 age = (now - ift->cstamp) / HZ; 2498 max_valid = idev->cnf.temp_valid_lft - age; 2499 if (max_valid < 0) 2500 max_valid = 0; 2501 2502 max_prefered = idev->cnf.temp_prefered_lft - 2503 idev->desync_factor - age; 2504 if (max_prefered < 0) 2505 max_prefered = 0; 2506 2507 if (valid_lft > max_valid) 2508 valid_lft = max_valid; 2509 2510 if (prefered_lft > max_prefered) 2511 prefered_lft = max_prefered; 2512 2513 spin_lock(&ift->lock); 2514 flags = ift->flags; 2515 ift->valid_lft = valid_lft; 2516 ift->prefered_lft = prefered_lft; 2517 ift->tstamp = now; 2518 if (prefered_lft > 0) 2519 ift->flags &= ~IFA_F_DEPRECATED; 2520 2521 spin_unlock(&ift->lock); 2522 if (!(flags&IFA_F_TENTATIVE)) 2523 ipv6_ifa_notify(0, ift); 2524 } 2525 2526 if ((create || list_empty(&idev->tempaddr_list)) && 2527 idev->cnf.use_tempaddr > 0) { 2528 /* When a new public address is created as described 2529 * in [ADDRCONF], also create a new temporary address. 2530 * Also create a temporary address if it's enabled but 2531 * no temporary address currently exists. 2532 */ 2533 read_unlock_bh(&idev->lock); 2534 ipv6_create_tempaddr(ifp, false); 2535 } else { 2536 read_unlock_bh(&idev->lock); 2537 } 2538 } 2539 2540 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2541 { 2542 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2543 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2544 } 2545 2546 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2547 const struct prefix_info *pinfo, 2548 struct inet6_dev *in6_dev, 2549 const struct in6_addr *addr, int addr_type, 2550 u32 addr_flags, bool sllao, bool tokenized, 2551 __u32 valid_lft, u32 prefered_lft) 2552 { 2553 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2554 int create = 0; 2555 2556 if (!ifp && valid_lft) { 2557 int max_addresses = in6_dev->cnf.max_addresses; 2558 struct ifa6_config cfg = { 2559 .pfx = addr, 2560 .plen = pinfo->prefix_len, 2561 .ifa_flags = addr_flags, 2562 .valid_lft = valid_lft, 2563 .preferred_lft = prefered_lft, 2564 .scope = addr_type & IPV6_ADDR_SCOPE_MASK, 2565 }; 2566 2567 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2568 if ((net->ipv6.devconf_all->optimistic_dad || 2569 in6_dev->cnf.optimistic_dad) && 2570 !net->ipv6.devconf_all->forwarding && sllao) 2571 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 2572 #endif 2573 2574 /* Do not allow to create too much of autoconfigured 2575 * addresses; this would be too easy way to crash kernel. 2576 */ 2577 if (!max_addresses || 2578 ipv6_count_addresses(in6_dev) < max_addresses) 2579 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL); 2580 2581 if (IS_ERR_OR_NULL(ifp)) 2582 return -1; 2583 2584 create = 1; 2585 spin_lock_bh(&ifp->lock); 2586 ifp->flags |= IFA_F_MANAGETEMPADDR; 2587 ifp->cstamp = jiffies; 2588 ifp->tokenized = tokenized; 2589 spin_unlock_bh(&ifp->lock); 2590 addrconf_dad_start(ifp); 2591 } 2592 2593 if (ifp) { 2594 u32 flags; 2595 unsigned long now; 2596 u32 stored_lft; 2597 2598 /* Update lifetime (RFC4862 5.5.3 e) 2599 * We deviate from RFC4862 by honoring all Valid Lifetimes to 2600 * improve the reaction of SLAAC to renumbering events 2601 * (draft-gont-6man-slaac-renum-06, Section 4.2) 2602 */ 2603 spin_lock_bh(&ifp->lock); 2604 now = jiffies; 2605 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2606 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2607 else 2608 stored_lft = 0; 2609 2610 if (!create && stored_lft) { 2611 ifp->valid_lft = valid_lft; 2612 ifp->prefered_lft = prefered_lft; 2613 ifp->tstamp = now; 2614 flags = ifp->flags; 2615 ifp->flags &= ~IFA_F_DEPRECATED; 2616 spin_unlock_bh(&ifp->lock); 2617 2618 if (!(flags&IFA_F_TENTATIVE)) 2619 ipv6_ifa_notify(0, ifp); 2620 } else 2621 spin_unlock_bh(&ifp->lock); 2622 2623 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2624 create, now); 2625 2626 in6_ifa_put(ifp); 2627 addrconf_verify(); 2628 } 2629 2630 return 0; 2631 } 2632 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2633 2634 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2635 { 2636 struct prefix_info *pinfo; 2637 __u32 valid_lft; 2638 __u32 prefered_lft; 2639 int addr_type, err; 2640 u32 addr_flags = 0; 2641 struct inet6_dev *in6_dev; 2642 struct net *net = dev_net(dev); 2643 2644 pinfo = (struct prefix_info *) opt; 2645 2646 if (len < sizeof(struct prefix_info)) { 2647 netdev_dbg(dev, "addrconf: prefix option too short\n"); 2648 return; 2649 } 2650 2651 /* 2652 * Validation checks ([ADDRCONF], page 19) 2653 */ 2654 2655 addr_type = ipv6_addr_type(&pinfo->prefix); 2656 2657 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2658 return; 2659 2660 valid_lft = ntohl(pinfo->valid); 2661 prefered_lft = ntohl(pinfo->prefered); 2662 2663 if (prefered_lft > valid_lft) { 2664 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2665 return; 2666 } 2667 2668 in6_dev = in6_dev_get(dev); 2669 2670 if (!in6_dev) { 2671 net_dbg_ratelimited("addrconf: device %s not configured\n", 2672 dev->name); 2673 return; 2674 } 2675 2676 /* 2677 * Two things going on here: 2678 * 1) Add routes for on-link prefixes 2679 * 2) Configure prefixes with the auto flag set 2680 */ 2681 2682 if (pinfo->onlink) { 2683 struct fib6_info *rt; 2684 unsigned long rt_expires; 2685 2686 /* Avoid arithmetic overflow. Really, we could 2687 * save rt_expires in seconds, likely valid_lft, 2688 * but it would require division in fib gc, that it 2689 * not good. 2690 */ 2691 if (HZ > USER_HZ) 2692 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2693 else 2694 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2695 2696 if (addrconf_finite_timeout(rt_expires)) 2697 rt_expires *= HZ; 2698 2699 rt = addrconf_get_prefix_route(&pinfo->prefix, 2700 pinfo->prefix_len, 2701 dev, 2702 RTF_ADDRCONF | RTF_PREFIX_RT, 2703 RTF_DEFAULT, true); 2704 2705 if (rt) { 2706 /* Autoconf prefix route */ 2707 if (valid_lft == 0) { 2708 ip6_del_rt(net, rt, false); 2709 rt = NULL; 2710 } else if (addrconf_finite_timeout(rt_expires)) { 2711 /* not infinity */ 2712 fib6_set_expires(rt, jiffies + rt_expires); 2713 } else { 2714 fib6_clean_expires(rt); 2715 } 2716 } else if (valid_lft) { 2717 clock_t expires = 0; 2718 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2719 if (addrconf_finite_timeout(rt_expires)) { 2720 /* not infinity */ 2721 flags |= RTF_EXPIRES; 2722 expires = jiffies_to_clock_t(rt_expires); 2723 } 2724 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2725 0, dev, expires, flags, 2726 GFP_ATOMIC); 2727 } 2728 fib6_info_release(rt); 2729 } 2730 2731 /* Try to figure out our local address for this prefix */ 2732 2733 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2734 struct in6_addr addr; 2735 bool tokenized = false, dev_addr_generated = false; 2736 2737 if (pinfo->prefix_len == 64) { 2738 memcpy(&addr, &pinfo->prefix, 8); 2739 2740 if (!ipv6_addr_any(&in6_dev->token)) { 2741 read_lock_bh(&in6_dev->lock); 2742 memcpy(addr.s6_addr + 8, 2743 in6_dev->token.s6_addr + 8, 8); 2744 read_unlock_bh(&in6_dev->lock); 2745 tokenized = true; 2746 } else if (is_addr_mode_generate_stable(in6_dev) && 2747 !ipv6_generate_stable_address(&addr, 0, 2748 in6_dev)) { 2749 addr_flags |= IFA_F_STABLE_PRIVACY; 2750 goto ok; 2751 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2752 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2753 goto put; 2754 } else { 2755 dev_addr_generated = true; 2756 } 2757 goto ok; 2758 } 2759 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2760 pinfo->prefix_len); 2761 goto put; 2762 2763 ok: 2764 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2765 &addr, addr_type, 2766 addr_flags, sllao, 2767 tokenized, valid_lft, 2768 prefered_lft); 2769 if (err) 2770 goto put; 2771 2772 /* Ignore error case here because previous prefix add addr was 2773 * successful which will be notified. 2774 */ 2775 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2776 addr_type, addr_flags, sllao, 2777 tokenized, valid_lft, 2778 prefered_lft, 2779 dev_addr_generated); 2780 } 2781 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2782 put: 2783 in6_dev_put(in6_dev); 2784 } 2785 2786 static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev, 2787 struct in6_ifreq *ireq) 2788 { 2789 struct ip_tunnel_parm p = { }; 2790 int err; 2791 2792 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4)) 2793 return -EADDRNOTAVAIL; 2794 2795 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3]; 2796 p.iph.version = 4; 2797 p.iph.ihl = 5; 2798 p.iph.protocol = IPPROTO_IPV6; 2799 p.iph.ttl = 64; 2800 2801 if (!dev->netdev_ops->ndo_tunnel_ctl) 2802 return -EOPNOTSUPP; 2803 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL); 2804 if (err) 2805 return err; 2806 2807 dev = __dev_get_by_name(net, p.name); 2808 if (!dev) 2809 return -ENOBUFS; 2810 return dev_open(dev, NULL); 2811 } 2812 2813 /* 2814 * Set destination address. 2815 * Special case for SIT interfaces where we create a new "virtual" 2816 * device. 2817 */ 2818 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2819 { 2820 struct net_device *dev; 2821 struct in6_ifreq ireq; 2822 int err = -ENODEV; 2823 2824 if (!IS_ENABLED(CONFIG_IPV6_SIT)) 2825 return -ENODEV; 2826 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2827 return -EFAULT; 2828 2829 rtnl_lock(); 2830 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2831 if (dev && dev->type == ARPHRD_SIT) 2832 err = addrconf_set_sit_dstaddr(net, dev, &ireq); 2833 rtnl_unlock(); 2834 return err; 2835 } 2836 2837 static int ipv6_mc_config(struct sock *sk, bool join, 2838 const struct in6_addr *addr, int ifindex) 2839 { 2840 int ret; 2841 2842 ASSERT_RTNL(); 2843 2844 lock_sock(sk); 2845 if (join) 2846 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2847 else 2848 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2849 release_sock(sk); 2850 2851 return ret; 2852 } 2853 2854 /* 2855 * Manual configuration of address on an interface 2856 */ 2857 static int inet6_addr_add(struct net *net, int ifindex, 2858 struct ifa6_config *cfg, 2859 struct netlink_ext_ack *extack) 2860 { 2861 struct inet6_ifaddr *ifp; 2862 struct inet6_dev *idev; 2863 struct net_device *dev; 2864 unsigned long timeout; 2865 clock_t expires; 2866 u32 flags; 2867 2868 ASSERT_RTNL(); 2869 2870 if (cfg->plen > 128) 2871 return -EINVAL; 2872 2873 /* check the lifetime */ 2874 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 2875 return -EINVAL; 2876 2877 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) 2878 return -EINVAL; 2879 2880 dev = __dev_get_by_index(net, ifindex); 2881 if (!dev) 2882 return -ENODEV; 2883 2884 idev = addrconf_add_dev(dev); 2885 if (IS_ERR(idev)) 2886 return PTR_ERR(idev); 2887 2888 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2889 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2890 true, cfg->pfx, ifindex); 2891 2892 if (ret < 0) 2893 return ret; 2894 } 2895 2896 cfg->scope = ipv6_addr_scope(cfg->pfx); 2897 2898 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 2899 if (addrconf_finite_timeout(timeout)) { 2900 expires = jiffies_to_clock_t(timeout * HZ); 2901 cfg->valid_lft = timeout; 2902 flags = RTF_EXPIRES; 2903 } else { 2904 expires = 0; 2905 flags = 0; 2906 cfg->ifa_flags |= IFA_F_PERMANENT; 2907 } 2908 2909 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 2910 if (addrconf_finite_timeout(timeout)) { 2911 if (timeout == 0) 2912 cfg->ifa_flags |= IFA_F_DEPRECATED; 2913 cfg->preferred_lft = timeout; 2914 } 2915 2916 ifp = ipv6_add_addr(idev, cfg, true, extack); 2917 if (!IS_ERR(ifp)) { 2918 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 2919 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 2920 ifp->rt_priority, dev, expires, 2921 flags, GFP_KERNEL); 2922 } 2923 2924 /* Send a netlink notification if DAD is enabled and 2925 * optimistic flag is not set 2926 */ 2927 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD))) 2928 ipv6_ifa_notify(0, ifp); 2929 /* 2930 * Note that section 3.1 of RFC 4429 indicates 2931 * that the Optimistic flag should not be set for 2932 * manually configured addresses 2933 */ 2934 addrconf_dad_start(ifp); 2935 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR) 2936 manage_tempaddrs(idev, ifp, cfg->valid_lft, 2937 cfg->preferred_lft, true, jiffies); 2938 in6_ifa_put(ifp); 2939 addrconf_verify_rtnl(); 2940 return 0; 2941 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2942 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false, 2943 cfg->pfx, ifindex); 2944 } 2945 2946 return PTR_ERR(ifp); 2947 } 2948 2949 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2950 const struct in6_addr *pfx, unsigned int plen) 2951 { 2952 struct inet6_ifaddr *ifp; 2953 struct inet6_dev *idev; 2954 struct net_device *dev; 2955 2956 if (plen > 128) 2957 return -EINVAL; 2958 2959 dev = __dev_get_by_index(net, ifindex); 2960 if (!dev) 2961 return -ENODEV; 2962 2963 idev = __in6_dev_get(dev); 2964 if (!idev) 2965 return -ENXIO; 2966 2967 read_lock_bh(&idev->lock); 2968 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2969 if (ifp->prefix_len == plen && 2970 ipv6_addr_equal(pfx, &ifp->addr)) { 2971 in6_ifa_hold(ifp); 2972 read_unlock_bh(&idev->lock); 2973 2974 if (!(ifp->flags & IFA_F_TEMPORARY) && 2975 (ifa_flags & IFA_F_MANAGETEMPADDR)) 2976 manage_tempaddrs(idev, ifp, 0, 0, false, 2977 jiffies); 2978 ipv6_del_addr(ifp); 2979 addrconf_verify_rtnl(); 2980 if (ipv6_addr_is_multicast(pfx)) { 2981 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2982 false, pfx, dev->ifindex); 2983 } 2984 return 0; 2985 } 2986 } 2987 read_unlock_bh(&idev->lock); 2988 return -EADDRNOTAVAIL; 2989 } 2990 2991 2992 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2993 { 2994 struct ifa6_config cfg = { 2995 .ifa_flags = IFA_F_PERMANENT, 2996 .preferred_lft = INFINITY_LIFE_TIME, 2997 .valid_lft = INFINITY_LIFE_TIME, 2998 }; 2999 struct in6_ifreq ireq; 3000 int err; 3001 3002 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3003 return -EPERM; 3004 3005 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3006 return -EFAULT; 3007 3008 cfg.pfx = &ireq.ifr6_addr; 3009 cfg.plen = ireq.ifr6_prefixlen; 3010 3011 rtnl_lock(); 3012 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL); 3013 rtnl_unlock(); 3014 return err; 3015 } 3016 3017 int addrconf_del_ifaddr(struct net *net, void __user *arg) 3018 { 3019 struct in6_ifreq ireq; 3020 int err; 3021 3022 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3023 return -EPERM; 3024 3025 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3026 return -EFAULT; 3027 3028 rtnl_lock(); 3029 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 3030 ireq.ifr6_prefixlen); 3031 rtnl_unlock(); 3032 return err; 3033 } 3034 3035 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 3036 int plen, int scope) 3037 { 3038 struct inet6_ifaddr *ifp; 3039 struct ifa6_config cfg = { 3040 .pfx = addr, 3041 .plen = plen, 3042 .ifa_flags = IFA_F_PERMANENT, 3043 .valid_lft = INFINITY_LIFE_TIME, 3044 .preferred_lft = INFINITY_LIFE_TIME, 3045 .scope = scope 3046 }; 3047 3048 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3049 if (!IS_ERR(ifp)) { 3050 spin_lock_bh(&ifp->lock); 3051 ifp->flags &= ~IFA_F_TENTATIVE; 3052 spin_unlock_bh(&ifp->lock); 3053 rt_genid_bump_ipv6(dev_net(idev->dev)); 3054 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3055 in6_ifa_put(ifp); 3056 } 3057 } 3058 3059 #if IS_ENABLED(CONFIG_IPV6_SIT) 3060 static void sit_add_v4_addrs(struct inet6_dev *idev) 3061 { 3062 struct in6_addr addr; 3063 struct net_device *dev; 3064 struct net *net = dev_net(idev->dev); 3065 int scope, plen; 3066 u32 pflags = 0; 3067 3068 ASSERT_RTNL(); 3069 3070 memset(&addr, 0, sizeof(struct in6_addr)); 3071 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 3072 3073 if (idev->dev->flags&IFF_POINTOPOINT) { 3074 addr.s6_addr32[0] = htonl(0xfe800000); 3075 scope = IFA_LINK; 3076 plen = 64; 3077 } else { 3078 scope = IPV6_ADDR_COMPATv4; 3079 plen = 96; 3080 pflags |= RTF_NONEXTHOP; 3081 } 3082 3083 if (addr.s6_addr32[3]) { 3084 add_addr(idev, &addr, plen, scope); 3085 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags, 3086 GFP_KERNEL); 3087 return; 3088 } 3089 3090 for_each_netdev(net, dev) { 3091 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3092 if (in_dev && (dev->flags & IFF_UP)) { 3093 struct in_ifaddr *ifa; 3094 int flag = scope; 3095 3096 in_dev_for_each_ifa_rtnl(ifa, in_dev) { 3097 addr.s6_addr32[3] = ifa->ifa_local; 3098 3099 if (ifa->ifa_scope == RT_SCOPE_LINK) 3100 continue; 3101 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3102 if (idev->dev->flags&IFF_POINTOPOINT) 3103 continue; 3104 flag |= IFA_HOST; 3105 } 3106 3107 add_addr(idev, &addr, plen, flag); 3108 addrconf_prefix_route(&addr, plen, 0, idev->dev, 3109 0, pflags, GFP_KERNEL); 3110 } 3111 } 3112 } 3113 } 3114 #endif 3115 3116 static void init_loopback(struct net_device *dev) 3117 { 3118 struct inet6_dev *idev; 3119 3120 /* ::1 */ 3121 3122 ASSERT_RTNL(); 3123 3124 idev = ipv6_find_idev(dev); 3125 if (IS_ERR(idev)) { 3126 pr_debug("%s: add_dev failed\n", __func__); 3127 return; 3128 } 3129 3130 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 3131 } 3132 3133 void addrconf_add_linklocal(struct inet6_dev *idev, 3134 const struct in6_addr *addr, u32 flags) 3135 { 3136 struct ifa6_config cfg = { 3137 .pfx = addr, 3138 .plen = 64, 3139 .ifa_flags = flags | IFA_F_PERMANENT, 3140 .valid_lft = INFINITY_LIFE_TIME, 3141 .preferred_lft = INFINITY_LIFE_TIME, 3142 .scope = IFA_LINK 3143 }; 3144 struct inet6_ifaddr *ifp; 3145 3146 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3147 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad || 3148 idev->cnf.optimistic_dad) && 3149 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3150 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 3151 #endif 3152 3153 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3154 if (!IS_ERR(ifp)) { 3155 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev, 3156 0, 0, GFP_ATOMIC); 3157 addrconf_dad_start(ifp); 3158 in6_ifa_put(ifp); 3159 } 3160 } 3161 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3162 3163 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3164 { 3165 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3166 return true; 3167 3168 if (address.s6_addr32[2] == htonl(0x02005eff) && 3169 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3170 return true; 3171 3172 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3173 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3174 return true; 3175 3176 return false; 3177 } 3178 3179 static int ipv6_generate_stable_address(struct in6_addr *address, 3180 u8 dad_count, 3181 const struct inet6_dev *idev) 3182 { 3183 static DEFINE_SPINLOCK(lock); 3184 static __u32 digest[SHA1_DIGEST_WORDS]; 3185 static __u32 workspace[SHA1_WORKSPACE_WORDS]; 3186 3187 static union { 3188 char __data[SHA1_BLOCK_SIZE]; 3189 struct { 3190 struct in6_addr secret; 3191 __be32 prefix[2]; 3192 unsigned char hwaddr[MAX_ADDR_LEN]; 3193 u8 dad_count; 3194 } __packed; 3195 } data; 3196 3197 struct in6_addr secret; 3198 struct in6_addr temp; 3199 struct net *net = dev_net(idev->dev); 3200 3201 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3202 3203 if (idev->cnf.stable_secret.initialized) 3204 secret = idev->cnf.stable_secret.secret; 3205 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3206 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3207 else 3208 return -1; 3209 3210 retry: 3211 spin_lock_bh(&lock); 3212 3213 sha1_init(digest); 3214 memset(&data, 0, sizeof(data)); 3215 memset(workspace, 0, sizeof(workspace)); 3216 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3217 data.prefix[0] = address->s6_addr32[0]; 3218 data.prefix[1] = address->s6_addr32[1]; 3219 data.secret = secret; 3220 data.dad_count = dad_count; 3221 3222 sha1_transform(digest, data.__data, workspace); 3223 3224 temp = *address; 3225 temp.s6_addr32[2] = (__force __be32)digest[0]; 3226 temp.s6_addr32[3] = (__force __be32)digest[1]; 3227 3228 spin_unlock_bh(&lock); 3229 3230 if (ipv6_reserved_interfaceid(temp)) { 3231 dad_count++; 3232 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3233 return -1; 3234 goto retry; 3235 } 3236 3237 *address = temp; 3238 return 0; 3239 } 3240 3241 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3242 { 3243 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3244 3245 if (s->initialized) 3246 return; 3247 s = &idev->cnf.stable_secret; 3248 get_random_bytes(&s->secret, sizeof(s->secret)); 3249 s->initialized = true; 3250 } 3251 3252 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3253 { 3254 struct in6_addr addr; 3255 3256 /* no link local addresses on L3 master devices */ 3257 if (netif_is_l3_master(idev->dev)) 3258 return; 3259 3260 /* no link local addresses on devices flagged as slaves */ 3261 if (idev->dev->flags & IFF_SLAVE) 3262 return; 3263 3264 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3265 3266 switch (idev->cnf.addr_gen_mode) { 3267 case IN6_ADDR_GEN_MODE_RANDOM: 3268 ipv6_gen_mode_random_init(idev); 3269 fallthrough; 3270 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3271 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3272 addrconf_add_linklocal(idev, &addr, 3273 IFA_F_STABLE_PRIVACY); 3274 else if (prefix_route) 3275 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3276 0, 0, GFP_KERNEL); 3277 break; 3278 case IN6_ADDR_GEN_MODE_EUI64: 3279 /* addrconf_add_linklocal also adds a prefix_route and we 3280 * only need to care about prefix routes if ipv6_generate_eui64 3281 * couldn't generate one. 3282 */ 3283 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3284 addrconf_add_linklocal(idev, &addr, 0); 3285 else if (prefix_route) 3286 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3287 0, 0, GFP_KERNEL); 3288 break; 3289 case IN6_ADDR_GEN_MODE_NONE: 3290 default: 3291 /* will not add any link local address */ 3292 break; 3293 } 3294 } 3295 3296 static void addrconf_dev_config(struct net_device *dev) 3297 { 3298 struct inet6_dev *idev; 3299 3300 ASSERT_RTNL(); 3301 3302 if ((dev->type != ARPHRD_ETHER) && 3303 (dev->type != ARPHRD_FDDI) && 3304 (dev->type != ARPHRD_ARCNET) && 3305 (dev->type != ARPHRD_INFINIBAND) && 3306 (dev->type != ARPHRD_IEEE1394) && 3307 (dev->type != ARPHRD_TUNNEL6) && 3308 (dev->type != ARPHRD_6LOWPAN) && 3309 (dev->type != ARPHRD_IP6GRE) && 3310 (dev->type != ARPHRD_IPGRE) && 3311 (dev->type != ARPHRD_TUNNEL) && 3312 (dev->type != ARPHRD_NONE) && 3313 (dev->type != ARPHRD_RAWIP)) { 3314 /* Alas, we support only Ethernet autoconfiguration. */ 3315 idev = __in6_dev_get(dev); 3316 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP && 3317 dev->flags & IFF_MULTICAST) 3318 ipv6_mc_up(idev); 3319 return; 3320 } 3321 3322 idev = addrconf_add_dev(dev); 3323 if (IS_ERR(idev)) 3324 return; 3325 3326 /* this device type has no EUI support */ 3327 if (dev->type == ARPHRD_NONE && 3328 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3329 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3330 3331 addrconf_addr_gen(idev, false); 3332 } 3333 3334 #if IS_ENABLED(CONFIG_IPV6_SIT) 3335 static void addrconf_sit_config(struct net_device *dev) 3336 { 3337 struct inet6_dev *idev; 3338 3339 ASSERT_RTNL(); 3340 3341 /* 3342 * Configure the tunnel with one of our IPv4 3343 * addresses... we should configure all of 3344 * our v4 addrs in the tunnel 3345 */ 3346 3347 idev = ipv6_find_idev(dev); 3348 if (IS_ERR(idev)) { 3349 pr_debug("%s: add_dev failed\n", __func__); 3350 return; 3351 } 3352 3353 if (dev->priv_flags & IFF_ISATAP) { 3354 addrconf_addr_gen(idev, false); 3355 return; 3356 } 3357 3358 sit_add_v4_addrs(idev); 3359 3360 if (dev->flags&IFF_POINTOPOINT) 3361 addrconf_add_mroute(dev); 3362 } 3363 #endif 3364 3365 #if IS_ENABLED(CONFIG_NET_IPGRE) 3366 static void addrconf_gre_config(struct net_device *dev) 3367 { 3368 struct inet6_dev *idev; 3369 3370 ASSERT_RTNL(); 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 addrconf_addr_gen(idev, true); 3379 if (dev->flags & IFF_POINTOPOINT) 3380 addrconf_add_mroute(dev); 3381 } 3382 #endif 3383 3384 static int fixup_permanent_addr(struct net *net, 3385 struct inet6_dev *idev, 3386 struct inet6_ifaddr *ifp) 3387 { 3388 /* !fib6_node means the host route was removed from the 3389 * FIB, for example, if 'lo' device is taken down. In that 3390 * case regenerate the host route. 3391 */ 3392 if (!ifp->rt || !ifp->rt->fib6_node) { 3393 struct fib6_info *f6i, *prev; 3394 3395 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false, 3396 GFP_ATOMIC); 3397 if (IS_ERR(f6i)) 3398 return PTR_ERR(f6i); 3399 3400 /* ifp->rt can be accessed outside of rtnl */ 3401 spin_lock(&ifp->lock); 3402 prev = ifp->rt; 3403 ifp->rt = f6i; 3404 spin_unlock(&ifp->lock); 3405 3406 fib6_info_release(prev); 3407 } 3408 3409 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3410 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3411 ifp->rt_priority, idev->dev, 0, 0, 3412 GFP_ATOMIC); 3413 } 3414 3415 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3416 addrconf_dad_start(ifp); 3417 3418 return 0; 3419 } 3420 3421 static void addrconf_permanent_addr(struct net *net, struct net_device *dev) 3422 { 3423 struct inet6_ifaddr *ifp, *tmp; 3424 struct inet6_dev *idev; 3425 3426 idev = __in6_dev_get(dev); 3427 if (!idev) 3428 return; 3429 3430 write_lock_bh(&idev->lock); 3431 3432 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3433 if ((ifp->flags & IFA_F_PERMANENT) && 3434 fixup_permanent_addr(net, idev, ifp) < 0) { 3435 write_unlock_bh(&idev->lock); 3436 in6_ifa_hold(ifp); 3437 ipv6_del_addr(ifp); 3438 write_lock_bh(&idev->lock); 3439 3440 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3441 idev->dev->name, &ifp->addr); 3442 } 3443 } 3444 3445 write_unlock_bh(&idev->lock); 3446 } 3447 3448 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3449 void *ptr) 3450 { 3451 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3452 struct netdev_notifier_change_info *change_info; 3453 struct netdev_notifier_changeupper_info *info; 3454 struct inet6_dev *idev = __in6_dev_get(dev); 3455 struct net *net = dev_net(dev); 3456 int run_pending = 0; 3457 int err; 3458 3459 switch (event) { 3460 case NETDEV_REGISTER: 3461 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3462 idev = ipv6_add_dev(dev); 3463 if (IS_ERR(idev)) 3464 return notifier_from_errno(PTR_ERR(idev)); 3465 } 3466 break; 3467 3468 case NETDEV_CHANGEMTU: 3469 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3470 if (dev->mtu < IPV6_MIN_MTU) { 3471 addrconf_ifdown(dev, dev != net->loopback_dev); 3472 break; 3473 } 3474 3475 if (idev) { 3476 rt6_mtu_change(dev, dev->mtu); 3477 idev->cnf.mtu6 = dev->mtu; 3478 break; 3479 } 3480 3481 /* allocate new idev */ 3482 idev = ipv6_add_dev(dev); 3483 if (IS_ERR(idev)) 3484 break; 3485 3486 /* device is still not ready */ 3487 if (!(idev->if_flags & IF_READY)) 3488 break; 3489 3490 run_pending = 1; 3491 fallthrough; 3492 case NETDEV_UP: 3493 case NETDEV_CHANGE: 3494 if (dev->flags & IFF_SLAVE) 3495 break; 3496 3497 if (idev && idev->cnf.disable_ipv6) 3498 break; 3499 3500 if (event == NETDEV_UP) { 3501 /* restore routes for permanent addresses */ 3502 addrconf_permanent_addr(net, dev); 3503 3504 if (!addrconf_link_ready(dev)) { 3505 /* device is not ready yet. */ 3506 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3507 dev->name); 3508 break; 3509 } 3510 3511 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3512 idev = ipv6_add_dev(dev); 3513 3514 if (!IS_ERR_OR_NULL(idev)) { 3515 idev->if_flags |= IF_READY; 3516 run_pending = 1; 3517 } 3518 } else if (event == NETDEV_CHANGE) { 3519 if (!addrconf_link_ready(dev)) { 3520 /* device is still not ready. */ 3521 rt6_sync_down_dev(dev, event); 3522 break; 3523 } 3524 3525 if (!IS_ERR_OR_NULL(idev)) { 3526 if (idev->if_flags & IF_READY) { 3527 /* device is already configured - 3528 * but resend MLD reports, we might 3529 * have roamed and need to update 3530 * multicast snooping switches 3531 */ 3532 ipv6_mc_up(idev); 3533 change_info = ptr; 3534 if (change_info->flags_changed & IFF_NOARP) 3535 addrconf_dad_run(idev, true); 3536 rt6_sync_up(dev, RTNH_F_LINKDOWN); 3537 break; 3538 } 3539 idev->if_flags |= IF_READY; 3540 } 3541 3542 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3543 dev->name); 3544 3545 run_pending = 1; 3546 } 3547 3548 switch (dev->type) { 3549 #if IS_ENABLED(CONFIG_IPV6_SIT) 3550 case ARPHRD_SIT: 3551 addrconf_sit_config(dev); 3552 break; 3553 #endif 3554 #if IS_ENABLED(CONFIG_NET_IPGRE) 3555 case ARPHRD_IPGRE: 3556 addrconf_gre_config(dev); 3557 break; 3558 #endif 3559 case ARPHRD_LOOPBACK: 3560 init_loopback(dev); 3561 break; 3562 3563 default: 3564 addrconf_dev_config(dev); 3565 break; 3566 } 3567 3568 if (!IS_ERR_OR_NULL(idev)) { 3569 if (run_pending) 3570 addrconf_dad_run(idev, false); 3571 3572 /* Device has an address by now */ 3573 rt6_sync_up(dev, RTNH_F_DEAD); 3574 3575 /* 3576 * If the MTU changed during the interface down, 3577 * when the interface up, the changed MTU must be 3578 * reflected in the idev as well as routers. 3579 */ 3580 if (idev->cnf.mtu6 != dev->mtu && 3581 dev->mtu >= IPV6_MIN_MTU) { 3582 rt6_mtu_change(dev, dev->mtu); 3583 idev->cnf.mtu6 = dev->mtu; 3584 } 3585 idev->tstamp = jiffies; 3586 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3587 3588 /* 3589 * If the changed mtu during down is lower than 3590 * IPV6_MIN_MTU stop IPv6 on this interface. 3591 */ 3592 if (dev->mtu < IPV6_MIN_MTU) 3593 addrconf_ifdown(dev, dev != net->loopback_dev); 3594 } 3595 break; 3596 3597 case NETDEV_DOWN: 3598 case NETDEV_UNREGISTER: 3599 /* 3600 * Remove all addresses from this interface. 3601 */ 3602 addrconf_ifdown(dev, event != NETDEV_DOWN); 3603 break; 3604 3605 case NETDEV_CHANGENAME: 3606 if (idev) { 3607 snmp6_unregister_dev(idev); 3608 addrconf_sysctl_unregister(idev); 3609 err = addrconf_sysctl_register(idev); 3610 if (err) 3611 return notifier_from_errno(err); 3612 err = snmp6_register_dev(idev); 3613 if (err) { 3614 addrconf_sysctl_unregister(idev); 3615 return notifier_from_errno(err); 3616 } 3617 } 3618 break; 3619 3620 case NETDEV_PRE_TYPE_CHANGE: 3621 case NETDEV_POST_TYPE_CHANGE: 3622 if (idev) 3623 addrconf_type_change(dev, event); 3624 break; 3625 3626 case NETDEV_CHANGEUPPER: 3627 info = ptr; 3628 3629 /* flush all routes if dev is linked to or unlinked from 3630 * an L3 master device (e.g., VRF) 3631 */ 3632 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3633 addrconf_ifdown(dev, 0); 3634 } 3635 3636 return NOTIFY_OK; 3637 } 3638 3639 /* 3640 * addrconf module should be notified of a device going up 3641 */ 3642 static struct notifier_block ipv6_dev_notf = { 3643 .notifier_call = addrconf_notify, 3644 .priority = ADDRCONF_NOTIFY_PRIORITY, 3645 }; 3646 3647 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3648 { 3649 struct inet6_dev *idev; 3650 ASSERT_RTNL(); 3651 3652 idev = __in6_dev_get(dev); 3653 3654 if (event == NETDEV_POST_TYPE_CHANGE) 3655 ipv6_mc_remap(idev); 3656 else if (event == NETDEV_PRE_TYPE_CHANGE) 3657 ipv6_mc_unmap(idev); 3658 } 3659 3660 static bool addr_is_local(const struct in6_addr *addr) 3661 { 3662 return ipv6_addr_type(addr) & 3663 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3664 } 3665 3666 static int addrconf_ifdown(struct net_device *dev, int how) 3667 { 3668 unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN; 3669 struct net *net = dev_net(dev); 3670 struct inet6_dev *idev; 3671 struct inet6_ifaddr *ifa, *tmp; 3672 bool keep_addr = false; 3673 int state, i; 3674 3675 ASSERT_RTNL(); 3676 3677 rt6_disable_ip(dev, event); 3678 3679 idev = __in6_dev_get(dev); 3680 if (!idev) 3681 return -ENODEV; 3682 3683 /* 3684 * Step 1: remove reference to ipv6 device from parent device. 3685 * Do not dev_put! 3686 */ 3687 if (how) { 3688 idev->dead = 1; 3689 3690 /* protected by rtnl_lock */ 3691 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3692 3693 /* Step 1.5: remove snmp6 entry */ 3694 snmp6_unregister_dev(idev); 3695 3696 } 3697 3698 /* combine the user config with event to determine if permanent 3699 * addresses are to be removed from address hash table 3700 */ 3701 if (!how && !idev->cnf.disable_ipv6) { 3702 /* aggregate the system setting and interface setting */ 3703 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3704 3705 if (!_keep_addr) 3706 _keep_addr = idev->cnf.keep_addr_on_down; 3707 3708 keep_addr = (_keep_addr > 0); 3709 } 3710 3711 /* Step 2: clear hash table */ 3712 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3713 struct hlist_head *h = &inet6_addr_lst[i]; 3714 3715 spin_lock_bh(&addrconf_hash_lock); 3716 restart: 3717 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3718 if (ifa->idev == idev) { 3719 addrconf_del_dad_work(ifa); 3720 /* combined flag + permanent flag decide if 3721 * address is retained on a down event 3722 */ 3723 if (!keep_addr || 3724 !(ifa->flags & IFA_F_PERMANENT) || 3725 addr_is_local(&ifa->addr)) { 3726 hlist_del_init_rcu(&ifa->addr_lst); 3727 goto restart; 3728 } 3729 } 3730 } 3731 spin_unlock_bh(&addrconf_hash_lock); 3732 } 3733 3734 write_lock_bh(&idev->lock); 3735 3736 addrconf_del_rs_timer(idev); 3737 3738 /* Step 2: clear flags for stateless addrconf */ 3739 if (!how) 3740 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3741 3742 /* Step 3: clear tempaddr list */ 3743 while (!list_empty(&idev->tempaddr_list)) { 3744 ifa = list_first_entry(&idev->tempaddr_list, 3745 struct inet6_ifaddr, tmp_list); 3746 list_del(&ifa->tmp_list); 3747 write_unlock_bh(&idev->lock); 3748 spin_lock_bh(&ifa->lock); 3749 3750 if (ifa->ifpub) { 3751 in6_ifa_put(ifa->ifpub); 3752 ifa->ifpub = NULL; 3753 } 3754 spin_unlock_bh(&ifa->lock); 3755 in6_ifa_put(ifa); 3756 write_lock_bh(&idev->lock); 3757 } 3758 3759 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3760 struct fib6_info *rt = NULL; 3761 bool keep; 3762 3763 addrconf_del_dad_work(ifa); 3764 3765 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3766 !addr_is_local(&ifa->addr); 3767 3768 write_unlock_bh(&idev->lock); 3769 spin_lock_bh(&ifa->lock); 3770 3771 if (keep) { 3772 /* set state to skip the notifier below */ 3773 state = INET6_IFADDR_STATE_DEAD; 3774 ifa->state = INET6_IFADDR_STATE_PREDAD; 3775 if (!(ifa->flags & IFA_F_NODAD)) 3776 ifa->flags |= IFA_F_TENTATIVE; 3777 3778 rt = ifa->rt; 3779 ifa->rt = NULL; 3780 } else { 3781 state = ifa->state; 3782 ifa->state = INET6_IFADDR_STATE_DEAD; 3783 } 3784 3785 spin_unlock_bh(&ifa->lock); 3786 3787 if (rt) 3788 ip6_del_rt(net, rt, false); 3789 3790 if (state != INET6_IFADDR_STATE_DEAD) { 3791 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3792 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3793 } else { 3794 if (idev->cnf.forwarding) 3795 addrconf_leave_anycast(ifa); 3796 addrconf_leave_solict(ifa->idev, &ifa->addr); 3797 } 3798 3799 write_lock_bh(&idev->lock); 3800 if (!keep) { 3801 list_del_rcu(&ifa->if_list); 3802 in6_ifa_put(ifa); 3803 } 3804 } 3805 3806 write_unlock_bh(&idev->lock); 3807 3808 /* Step 5: Discard anycast and multicast list */ 3809 if (how) { 3810 ipv6_ac_destroy_dev(idev); 3811 ipv6_mc_destroy_dev(idev); 3812 } else { 3813 ipv6_mc_down(idev); 3814 } 3815 3816 idev->tstamp = jiffies; 3817 3818 /* Last: Shot the device (if unregistered) */ 3819 if (how) { 3820 addrconf_sysctl_unregister(idev); 3821 neigh_parms_release(&nd_tbl, idev->nd_parms); 3822 neigh_ifdown(&nd_tbl, dev); 3823 in6_dev_put(idev); 3824 } 3825 return 0; 3826 } 3827 3828 static void addrconf_rs_timer(struct timer_list *t) 3829 { 3830 struct inet6_dev *idev = from_timer(idev, t, rs_timer); 3831 struct net_device *dev = idev->dev; 3832 struct in6_addr lladdr; 3833 3834 write_lock(&idev->lock); 3835 if (idev->dead || !(idev->if_flags & IF_READY)) 3836 goto out; 3837 3838 if (!ipv6_accept_ra(idev)) 3839 goto out; 3840 3841 /* Announcement received after solicitation was sent */ 3842 if (idev->if_flags & IF_RA_RCVD) 3843 goto out; 3844 3845 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3846 write_unlock(&idev->lock); 3847 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3848 ndisc_send_rs(dev, &lladdr, 3849 &in6addr_linklocal_allrouters); 3850 else 3851 goto put; 3852 3853 write_lock(&idev->lock); 3854 idev->rs_interval = rfc3315_s14_backoff_update( 3855 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3856 /* The wait after the last probe can be shorter */ 3857 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3858 idev->cnf.rtr_solicits) ? 3859 idev->cnf.rtr_solicit_delay : 3860 idev->rs_interval); 3861 } else { 3862 /* 3863 * Note: we do not support deprecated "all on-link" 3864 * assumption any longer. 3865 */ 3866 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3867 } 3868 3869 out: 3870 write_unlock(&idev->lock); 3871 put: 3872 in6_dev_put(idev); 3873 } 3874 3875 /* 3876 * Duplicate Address Detection 3877 */ 3878 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3879 { 3880 unsigned long rand_num; 3881 struct inet6_dev *idev = ifp->idev; 3882 u64 nonce; 3883 3884 if (ifp->flags & IFA_F_OPTIMISTIC) 3885 rand_num = 0; 3886 else 3887 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3888 3889 nonce = 0; 3890 if (idev->cnf.enhanced_dad || 3891 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 3892 do 3893 get_random_bytes(&nonce, 6); 3894 while (nonce == 0); 3895 } 3896 ifp->dad_nonce = nonce; 3897 ifp->dad_probes = idev->cnf.dad_transmits; 3898 addrconf_mod_dad_work(ifp, rand_num); 3899 } 3900 3901 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3902 { 3903 struct inet6_dev *idev = ifp->idev; 3904 struct net_device *dev = idev->dev; 3905 bool bump_id, notify = false; 3906 struct net *net; 3907 3908 addrconf_join_solict(dev, &ifp->addr); 3909 3910 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3911 3912 read_lock_bh(&idev->lock); 3913 spin_lock(&ifp->lock); 3914 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3915 goto out; 3916 3917 net = dev_net(dev); 3918 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3919 (net->ipv6.devconf_all->accept_dad < 1 && 3920 idev->cnf.accept_dad < 1) || 3921 !(ifp->flags&IFA_F_TENTATIVE) || 3922 ifp->flags & IFA_F_NODAD) { 3923 bool send_na = false; 3924 3925 if (ifp->flags & IFA_F_TENTATIVE && 3926 !(ifp->flags & IFA_F_OPTIMISTIC)) 3927 send_na = true; 3928 bump_id = ifp->flags & IFA_F_TENTATIVE; 3929 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3930 spin_unlock(&ifp->lock); 3931 read_unlock_bh(&idev->lock); 3932 3933 addrconf_dad_completed(ifp, bump_id, send_na); 3934 return; 3935 } 3936 3937 if (!(idev->if_flags & IF_READY)) { 3938 spin_unlock(&ifp->lock); 3939 read_unlock_bh(&idev->lock); 3940 /* 3941 * If the device is not ready: 3942 * - keep it tentative if it is a permanent address. 3943 * - otherwise, kill it. 3944 */ 3945 in6_ifa_hold(ifp); 3946 addrconf_dad_stop(ifp, 0); 3947 return; 3948 } 3949 3950 /* 3951 * Optimistic nodes can start receiving 3952 * Frames right away 3953 */ 3954 if (ifp->flags & IFA_F_OPTIMISTIC) { 3955 ip6_ins_rt(net, ifp->rt); 3956 if (ipv6_use_optimistic_addr(net, idev)) { 3957 /* Because optimistic nodes can use this address, 3958 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3959 */ 3960 notify = true; 3961 } 3962 } 3963 3964 addrconf_dad_kick(ifp); 3965 out: 3966 spin_unlock(&ifp->lock); 3967 read_unlock_bh(&idev->lock); 3968 if (notify) 3969 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3970 } 3971 3972 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3973 { 3974 bool begin_dad = false; 3975 3976 spin_lock_bh(&ifp->lock); 3977 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3978 ifp->state = INET6_IFADDR_STATE_PREDAD; 3979 begin_dad = true; 3980 } 3981 spin_unlock_bh(&ifp->lock); 3982 3983 if (begin_dad) 3984 addrconf_mod_dad_work(ifp, 0); 3985 } 3986 3987 static void addrconf_dad_work(struct work_struct *w) 3988 { 3989 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3990 struct inet6_ifaddr, 3991 dad_work); 3992 struct inet6_dev *idev = ifp->idev; 3993 bool bump_id, disable_ipv6 = false; 3994 struct in6_addr mcaddr; 3995 3996 enum { 3997 DAD_PROCESS, 3998 DAD_BEGIN, 3999 DAD_ABORT, 4000 } action = DAD_PROCESS; 4001 4002 rtnl_lock(); 4003 4004 spin_lock_bh(&ifp->lock); 4005 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 4006 action = DAD_BEGIN; 4007 ifp->state = INET6_IFADDR_STATE_DAD; 4008 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 4009 action = DAD_ABORT; 4010 ifp->state = INET6_IFADDR_STATE_POSTDAD; 4011 4012 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 || 4013 idev->cnf.accept_dad > 1) && 4014 !idev->cnf.disable_ipv6 && 4015 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 4016 struct in6_addr addr; 4017 4018 addr.s6_addr32[0] = htonl(0xfe800000); 4019 addr.s6_addr32[1] = 0; 4020 4021 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 4022 ipv6_addr_equal(&ifp->addr, &addr)) { 4023 /* DAD failed for link-local based on MAC */ 4024 idev->cnf.disable_ipv6 = 1; 4025 4026 pr_info("%s: IPv6 being disabled!\n", 4027 ifp->idev->dev->name); 4028 disable_ipv6 = true; 4029 } 4030 } 4031 } 4032 spin_unlock_bh(&ifp->lock); 4033 4034 if (action == DAD_BEGIN) { 4035 addrconf_dad_begin(ifp); 4036 goto out; 4037 } else if (action == DAD_ABORT) { 4038 in6_ifa_hold(ifp); 4039 addrconf_dad_stop(ifp, 1); 4040 if (disable_ipv6) 4041 addrconf_ifdown(idev->dev, 0); 4042 goto out; 4043 } 4044 4045 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 4046 goto out; 4047 4048 write_lock_bh(&idev->lock); 4049 if (idev->dead || !(idev->if_flags & IF_READY)) { 4050 write_unlock_bh(&idev->lock); 4051 goto out; 4052 } 4053 4054 spin_lock(&ifp->lock); 4055 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 4056 spin_unlock(&ifp->lock); 4057 write_unlock_bh(&idev->lock); 4058 goto out; 4059 } 4060 4061 if (ifp->dad_probes == 0) { 4062 bool send_na = false; 4063 4064 /* 4065 * DAD was successful 4066 */ 4067 4068 if (ifp->flags & IFA_F_TENTATIVE && 4069 !(ifp->flags & IFA_F_OPTIMISTIC)) 4070 send_na = true; 4071 bump_id = ifp->flags & IFA_F_TENTATIVE; 4072 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4073 spin_unlock(&ifp->lock); 4074 write_unlock_bh(&idev->lock); 4075 4076 addrconf_dad_completed(ifp, bump_id, send_na); 4077 4078 goto out; 4079 } 4080 4081 ifp->dad_probes--; 4082 addrconf_mod_dad_work(ifp, 4083 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), 4084 HZ/100)); 4085 spin_unlock(&ifp->lock); 4086 write_unlock_bh(&idev->lock); 4087 4088 /* send a neighbour solicitation for our addr */ 4089 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 4090 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 4091 ifp->dad_nonce); 4092 out: 4093 in6_ifa_put(ifp); 4094 rtnl_unlock(); 4095 } 4096 4097 /* ifp->idev must be at least read locked */ 4098 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4099 { 4100 struct inet6_ifaddr *ifpiter; 4101 struct inet6_dev *idev = ifp->idev; 4102 4103 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4104 if (ifpiter->scope > IFA_LINK) 4105 break; 4106 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4107 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4108 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4109 IFA_F_PERMANENT) 4110 return false; 4111 } 4112 return true; 4113 } 4114 4115 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 4116 bool send_na) 4117 { 4118 struct net_device *dev = ifp->idev->dev; 4119 struct in6_addr lladdr; 4120 bool send_rs, send_mld; 4121 4122 addrconf_del_dad_work(ifp); 4123 4124 /* 4125 * Configure the address for reception. Now it is valid. 4126 */ 4127 4128 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4129 4130 /* If added prefix is link local and we are prepared to process 4131 router advertisements, start sending router solicitations. 4132 */ 4133 4134 read_lock_bh(&ifp->idev->lock); 4135 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4136 send_rs = send_mld && 4137 ipv6_accept_ra(ifp->idev) && 4138 ifp->idev->cnf.rtr_solicits != 0 && 4139 (dev->flags&IFF_LOOPBACK) == 0; 4140 read_unlock_bh(&ifp->idev->lock); 4141 4142 /* While dad is in progress mld report's source address is in6_addrany. 4143 * Resend with proper ll now. 4144 */ 4145 if (send_mld) 4146 ipv6_mc_dad_complete(ifp->idev); 4147 4148 /* send unsolicited NA if enabled */ 4149 if (send_na && 4150 (ifp->idev->cnf.ndisc_notify || 4151 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) { 4152 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr, 4153 /*router=*/ !!ifp->idev->cnf.forwarding, 4154 /*solicited=*/ false, /*override=*/ true, 4155 /*inc_opt=*/ true); 4156 } 4157 4158 if (send_rs) { 4159 /* 4160 * If a host as already performed a random delay 4161 * [...] as part of DAD [...] there is no need 4162 * to delay again before sending the first RS 4163 */ 4164 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4165 return; 4166 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4167 4168 write_lock_bh(&ifp->idev->lock); 4169 spin_lock(&ifp->lock); 4170 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4171 ifp->idev->cnf.rtr_solicit_interval); 4172 ifp->idev->rs_probes = 1; 4173 ifp->idev->if_flags |= IF_RS_SENT; 4174 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4175 spin_unlock(&ifp->lock); 4176 write_unlock_bh(&ifp->idev->lock); 4177 } 4178 4179 if (bump_id) 4180 rt_genid_bump_ipv6(dev_net(dev)); 4181 4182 /* Make sure that a new temporary address will be created 4183 * before this temporary address becomes deprecated. 4184 */ 4185 if (ifp->flags & IFA_F_TEMPORARY) 4186 addrconf_verify_rtnl(); 4187 } 4188 4189 static void addrconf_dad_run(struct inet6_dev *idev, bool restart) 4190 { 4191 struct inet6_ifaddr *ifp; 4192 4193 read_lock_bh(&idev->lock); 4194 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4195 spin_lock(&ifp->lock); 4196 if ((ifp->flags & IFA_F_TENTATIVE && 4197 ifp->state == INET6_IFADDR_STATE_DAD) || restart) { 4198 if (restart) 4199 ifp->state = INET6_IFADDR_STATE_PREDAD; 4200 addrconf_dad_kick(ifp); 4201 } 4202 spin_unlock(&ifp->lock); 4203 } 4204 read_unlock_bh(&idev->lock); 4205 } 4206 4207 #ifdef CONFIG_PROC_FS 4208 struct if6_iter_state { 4209 struct seq_net_private p; 4210 int bucket; 4211 int offset; 4212 }; 4213 4214 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4215 { 4216 struct if6_iter_state *state = seq->private; 4217 struct net *net = seq_file_net(seq); 4218 struct inet6_ifaddr *ifa = NULL; 4219 int p = 0; 4220 4221 /* initial bucket if pos is 0 */ 4222 if (pos == 0) { 4223 state->bucket = 0; 4224 state->offset = 0; 4225 } 4226 4227 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4228 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket], 4229 addr_lst) { 4230 if (!net_eq(dev_net(ifa->idev->dev), net)) 4231 continue; 4232 /* sync with offset */ 4233 if (p < state->offset) { 4234 p++; 4235 continue; 4236 } 4237 return ifa; 4238 } 4239 4240 /* prepare for next bucket */ 4241 state->offset = 0; 4242 p = 0; 4243 } 4244 return NULL; 4245 } 4246 4247 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4248 struct inet6_ifaddr *ifa) 4249 { 4250 struct if6_iter_state *state = seq->private; 4251 struct net *net = seq_file_net(seq); 4252 4253 hlist_for_each_entry_continue_rcu(ifa, addr_lst) { 4254 if (!net_eq(dev_net(ifa->idev->dev), net)) 4255 continue; 4256 state->offset++; 4257 return ifa; 4258 } 4259 4260 state->offset = 0; 4261 while (++state->bucket < IN6_ADDR_HSIZE) { 4262 hlist_for_each_entry_rcu(ifa, 4263 &inet6_addr_lst[state->bucket], addr_lst) { 4264 if (!net_eq(dev_net(ifa->idev->dev), net)) 4265 continue; 4266 return ifa; 4267 } 4268 } 4269 4270 return NULL; 4271 } 4272 4273 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4274 __acquires(rcu) 4275 { 4276 rcu_read_lock(); 4277 return if6_get_first(seq, *pos); 4278 } 4279 4280 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4281 { 4282 struct inet6_ifaddr *ifa; 4283 4284 ifa = if6_get_next(seq, v); 4285 ++*pos; 4286 return ifa; 4287 } 4288 4289 static void if6_seq_stop(struct seq_file *seq, void *v) 4290 __releases(rcu) 4291 { 4292 rcu_read_unlock(); 4293 } 4294 4295 static int if6_seq_show(struct seq_file *seq, void *v) 4296 { 4297 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4298 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4299 &ifp->addr, 4300 ifp->idev->dev->ifindex, 4301 ifp->prefix_len, 4302 ifp->scope, 4303 (u8) ifp->flags, 4304 ifp->idev->dev->name); 4305 return 0; 4306 } 4307 4308 static const struct seq_operations if6_seq_ops = { 4309 .start = if6_seq_start, 4310 .next = if6_seq_next, 4311 .show = if6_seq_show, 4312 .stop = if6_seq_stop, 4313 }; 4314 4315 static int __net_init if6_proc_net_init(struct net *net) 4316 { 4317 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops, 4318 sizeof(struct if6_iter_state))) 4319 return -ENOMEM; 4320 return 0; 4321 } 4322 4323 static void __net_exit if6_proc_net_exit(struct net *net) 4324 { 4325 remove_proc_entry("if_inet6", net->proc_net); 4326 } 4327 4328 static struct pernet_operations if6_proc_net_ops = { 4329 .init = if6_proc_net_init, 4330 .exit = if6_proc_net_exit, 4331 }; 4332 4333 int __init if6_proc_init(void) 4334 { 4335 return register_pernet_subsys(&if6_proc_net_ops); 4336 } 4337 4338 void if6_proc_exit(void) 4339 { 4340 unregister_pernet_subsys(&if6_proc_net_ops); 4341 } 4342 #endif /* CONFIG_PROC_FS */ 4343 4344 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4345 /* Check if address is a home address configured on any interface. */ 4346 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4347 { 4348 unsigned int hash = inet6_addr_hash(net, addr); 4349 struct inet6_ifaddr *ifp = NULL; 4350 int ret = 0; 4351 4352 rcu_read_lock(); 4353 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 4354 if (!net_eq(dev_net(ifp->idev->dev), net)) 4355 continue; 4356 if (ipv6_addr_equal(&ifp->addr, addr) && 4357 (ifp->flags & IFA_F_HOMEADDRESS)) { 4358 ret = 1; 4359 break; 4360 } 4361 } 4362 rcu_read_unlock(); 4363 return ret; 4364 } 4365 #endif 4366 4367 /* RFC6554 has some algorithm to avoid loops in segment routing by 4368 * checking if the segments contains any of a local interface address. 4369 * 4370 * Quote: 4371 * 4372 * To detect loops in the SRH, a router MUST determine if the SRH 4373 * includes multiple addresses assigned to any interface on that router. 4374 * If such addresses appear more than once and are separated by at least 4375 * one address not assigned to that router. 4376 */ 4377 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs, 4378 unsigned char nsegs) 4379 { 4380 const struct in6_addr *addr; 4381 int i, ret = 0, found = 0; 4382 struct inet6_ifaddr *ifp; 4383 bool separated = false; 4384 unsigned int hash; 4385 bool hash_found; 4386 4387 rcu_read_lock(); 4388 for (i = 0; i < nsegs; i++) { 4389 addr = &segs[i]; 4390 hash = inet6_addr_hash(net, addr); 4391 4392 hash_found = false; 4393 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 4394 if (!net_eq(dev_net(ifp->idev->dev), net)) 4395 continue; 4396 4397 if (ipv6_addr_equal(&ifp->addr, addr)) { 4398 hash_found = true; 4399 break; 4400 } 4401 } 4402 4403 if (hash_found) { 4404 if (found > 1 && separated) { 4405 ret = 1; 4406 break; 4407 } 4408 4409 separated = false; 4410 found++; 4411 } else { 4412 separated = true; 4413 } 4414 } 4415 rcu_read_unlock(); 4416 4417 return ret; 4418 } 4419 4420 /* 4421 * Periodic address status verification 4422 */ 4423 4424 static void addrconf_verify_rtnl(void) 4425 { 4426 unsigned long now, next, next_sec, next_sched; 4427 struct inet6_ifaddr *ifp; 4428 int i; 4429 4430 ASSERT_RTNL(); 4431 4432 rcu_read_lock_bh(); 4433 now = jiffies; 4434 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4435 4436 cancel_delayed_work(&addr_chk_work); 4437 4438 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4439 restart: 4440 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4441 unsigned long age; 4442 4443 /* When setting preferred_lft to a value not zero or 4444 * infinity, while valid_lft is infinity 4445 * IFA_F_PERMANENT has a non-infinity life time. 4446 */ 4447 if ((ifp->flags & IFA_F_PERMANENT) && 4448 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4449 continue; 4450 4451 spin_lock(&ifp->lock); 4452 /* We try to batch several events at once. */ 4453 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4454 4455 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4456 age >= ifp->valid_lft) { 4457 spin_unlock(&ifp->lock); 4458 in6_ifa_hold(ifp); 4459 ipv6_del_addr(ifp); 4460 goto restart; 4461 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4462 spin_unlock(&ifp->lock); 4463 continue; 4464 } else if (age >= ifp->prefered_lft) { 4465 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4466 int deprecate = 0; 4467 4468 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4469 deprecate = 1; 4470 ifp->flags |= IFA_F_DEPRECATED; 4471 } 4472 4473 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4474 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4475 next = ifp->tstamp + ifp->valid_lft * HZ; 4476 4477 spin_unlock(&ifp->lock); 4478 4479 if (deprecate) { 4480 in6_ifa_hold(ifp); 4481 4482 ipv6_ifa_notify(0, ifp); 4483 in6_ifa_put(ifp); 4484 goto restart; 4485 } 4486 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4487 !(ifp->flags&IFA_F_TENTATIVE)) { 4488 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4489 ifp->idev->cnf.dad_transmits * 4490 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 4491 4492 if (age >= ifp->prefered_lft - regen_advance) { 4493 struct inet6_ifaddr *ifpub = ifp->ifpub; 4494 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4495 next = ifp->tstamp + ifp->prefered_lft * HZ; 4496 if (!ifp->regen_count && ifpub) { 4497 ifp->regen_count++; 4498 in6_ifa_hold(ifp); 4499 in6_ifa_hold(ifpub); 4500 spin_unlock(&ifp->lock); 4501 4502 spin_lock(&ifpub->lock); 4503 ifpub->regen_count = 0; 4504 spin_unlock(&ifpub->lock); 4505 rcu_read_unlock_bh(); 4506 ipv6_create_tempaddr(ifpub, true); 4507 in6_ifa_put(ifpub); 4508 in6_ifa_put(ifp); 4509 rcu_read_lock_bh(); 4510 goto restart; 4511 } 4512 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4513 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4514 spin_unlock(&ifp->lock); 4515 } else { 4516 /* ifp->prefered_lft <= ifp->valid_lft */ 4517 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4518 next = ifp->tstamp + ifp->prefered_lft * HZ; 4519 spin_unlock(&ifp->lock); 4520 } 4521 } 4522 } 4523 4524 next_sec = round_jiffies_up(next); 4525 next_sched = next; 4526 4527 /* If rounded timeout is accurate enough, accept it. */ 4528 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4529 next_sched = next_sec; 4530 4531 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4532 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4533 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4534 4535 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4536 now, next, next_sec, next_sched); 4537 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4538 rcu_read_unlock_bh(); 4539 } 4540 4541 static void addrconf_verify_work(struct work_struct *w) 4542 { 4543 rtnl_lock(); 4544 addrconf_verify_rtnl(); 4545 rtnl_unlock(); 4546 } 4547 4548 static void addrconf_verify(void) 4549 { 4550 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4551 } 4552 4553 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4554 struct in6_addr **peer_pfx) 4555 { 4556 struct in6_addr *pfx = NULL; 4557 4558 *peer_pfx = NULL; 4559 4560 if (addr) 4561 pfx = nla_data(addr); 4562 4563 if (local) { 4564 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4565 *peer_pfx = pfx; 4566 pfx = nla_data(local); 4567 } 4568 4569 return pfx; 4570 } 4571 4572 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4573 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4574 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4575 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4576 [IFA_FLAGS] = { .len = sizeof(u32) }, 4577 [IFA_RT_PRIORITY] = { .len = sizeof(u32) }, 4578 [IFA_TARGET_NETNSID] = { .type = NLA_S32 }, 4579 }; 4580 4581 static int 4582 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4583 struct netlink_ext_ack *extack) 4584 { 4585 struct net *net = sock_net(skb->sk); 4586 struct ifaddrmsg *ifm; 4587 struct nlattr *tb[IFA_MAX+1]; 4588 struct in6_addr *pfx, *peer_pfx; 4589 u32 ifa_flags; 4590 int err; 4591 4592 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4593 ifa_ipv6_policy, extack); 4594 if (err < 0) 4595 return err; 4596 4597 ifm = nlmsg_data(nlh); 4598 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4599 if (!pfx) 4600 return -EINVAL; 4601 4602 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4603 4604 /* We ignore other flags so far. */ 4605 ifa_flags &= IFA_F_MANAGETEMPADDR; 4606 4607 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4608 ifm->ifa_prefixlen); 4609 } 4610 4611 static int modify_prefix_route(struct inet6_ifaddr *ifp, 4612 unsigned long expires, u32 flags, 4613 bool modify_peer) 4614 { 4615 struct fib6_info *f6i; 4616 u32 prio; 4617 4618 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4619 ifp->prefix_len, 4620 ifp->idev->dev, 0, RTF_DEFAULT, true); 4621 if (!f6i) 4622 return -ENOENT; 4623 4624 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF; 4625 if (f6i->fib6_metric != prio) { 4626 /* delete old one */ 4627 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 4628 4629 /* add new one */ 4630 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4631 ifp->prefix_len, 4632 ifp->rt_priority, ifp->idev->dev, 4633 expires, flags, GFP_KERNEL); 4634 } else { 4635 if (!expires) 4636 fib6_clean_expires(f6i); 4637 else 4638 fib6_set_expires(f6i, expires); 4639 4640 fib6_info_release(f6i); 4641 } 4642 4643 return 0; 4644 } 4645 4646 static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg) 4647 { 4648 u32 flags; 4649 clock_t expires; 4650 unsigned long timeout; 4651 bool was_managetempaddr; 4652 bool had_prefixroute; 4653 bool new_peer = false; 4654 4655 ASSERT_RTNL(); 4656 4657 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 4658 return -EINVAL; 4659 4660 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && 4661 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4662 return -EINVAL; 4663 4664 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED) 4665 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC; 4666 4667 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 4668 if (addrconf_finite_timeout(timeout)) { 4669 expires = jiffies_to_clock_t(timeout * HZ); 4670 cfg->valid_lft = timeout; 4671 flags = RTF_EXPIRES; 4672 } else { 4673 expires = 0; 4674 flags = 0; 4675 cfg->ifa_flags |= IFA_F_PERMANENT; 4676 } 4677 4678 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 4679 if (addrconf_finite_timeout(timeout)) { 4680 if (timeout == 0) 4681 cfg->ifa_flags |= IFA_F_DEPRECATED; 4682 cfg->preferred_lft = timeout; 4683 } 4684 4685 if (cfg->peer_pfx && 4686 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) { 4687 if (!ipv6_addr_any(&ifp->peer_addr)) 4688 cleanup_prefix_route(ifp, expires, true, true); 4689 new_peer = true; 4690 } 4691 4692 spin_lock_bh(&ifp->lock); 4693 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4694 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4695 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4696 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4697 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4698 IFA_F_NOPREFIXROUTE); 4699 ifp->flags |= cfg->ifa_flags; 4700 ifp->tstamp = jiffies; 4701 ifp->valid_lft = cfg->valid_lft; 4702 ifp->prefered_lft = cfg->preferred_lft; 4703 4704 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority) 4705 ifp->rt_priority = cfg->rt_priority; 4706 4707 if (new_peer) 4708 ifp->peer_addr = *cfg->peer_pfx; 4709 4710 spin_unlock_bh(&ifp->lock); 4711 if (!(ifp->flags&IFA_F_TENTATIVE)) 4712 ipv6_ifa_notify(0, ifp); 4713 4714 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 4715 int rc = -ENOENT; 4716 4717 if (had_prefixroute) 4718 rc = modify_prefix_route(ifp, expires, flags, false); 4719 4720 /* prefix route could have been deleted; if so restore it */ 4721 if (rc == -ENOENT) { 4722 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4723 ifp->rt_priority, ifp->idev->dev, 4724 expires, flags, GFP_KERNEL); 4725 } 4726 4727 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr)) 4728 rc = modify_prefix_route(ifp, expires, flags, true); 4729 4730 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) { 4731 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len, 4732 ifp->rt_priority, ifp->idev->dev, 4733 expires, flags, GFP_KERNEL); 4734 } 4735 } else if (had_prefixroute) { 4736 enum cleanup_prefix_rt_t action; 4737 unsigned long rt_expires; 4738 4739 write_lock_bh(&ifp->idev->lock); 4740 action = check_cleanup_prefix_route(ifp, &rt_expires); 4741 write_unlock_bh(&ifp->idev->lock); 4742 4743 if (action != CLEANUP_PREFIX_RT_NOP) { 4744 cleanup_prefix_route(ifp, rt_expires, 4745 action == CLEANUP_PREFIX_RT_DEL, false); 4746 } 4747 } 4748 4749 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4750 if (was_managetempaddr && 4751 !(ifp->flags & IFA_F_MANAGETEMPADDR)) { 4752 cfg->valid_lft = 0; 4753 cfg->preferred_lft = 0; 4754 } 4755 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft, 4756 cfg->preferred_lft, !was_managetempaddr, 4757 jiffies); 4758 } 4759 4760 addrconf_verify_rtnl(); 4761 4762 return 0; 4763 } 4764 4765 static int 4766 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4767 struct netlink_ext_ack *extack) 4768 { 4769 struct net *net = sock_net(skb->sk); 4770 struct ifaddrmsg *ifm; 4771 struct nlattr *tb[IFA_MAX+1]; 4772 struct in6_addr *peer_pfx; 4773 struct inet6_ifaddr *ifa; 4774 struct net_device *dev; 4775 struct inet6_dev *idev; 4776 struct ifa6_config cfg; 4777 int err; 4778 4779 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4780 ifa_ipv6_policy, extack); 4781 if (err < 0) 4782 return err; 4783 4784 memset(&cfg, 0, sizeof(cfg)); 4785 4786 ifm = nlmsg_data(nlh); 4787 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4788 if (!cfg.pfx) 4789 return -EINVAL; 4790 4791 cfg.peer_pfx = peer_pfx; 4792 cfg.plen = ifm->ifa_prefixlen; 4793 if (tb[IFA_RT_PRIORITY]) 4794 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]); 4795 4796 cfg.valid_lft = INFINITY_LIFE_TIME; 4797 cfg.preferred_lft = INFINITY_LIFE_TIME; 4798 4799 if (tb[IFA_CACHEINFO]) { 4800 struct ifa_cacheinfo *ci; 4801 4802 ci = nla_data(tb[IFA_CACHEINFO]); 4803 cfg.valid_lft = ci->ifa_valid; 4804 cfg.preferred_lft = ci->ifa_prefered; 4805 } 4806 4807 dev = __dev_get_by_index(net, ifm->ifa_index); 4808 if (!dev) 4809 return -ENODEV; 4810 4811 if (tb[IFA_FLAGS]) 4812 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]); 4813 else 4814 cfg.ifa_flags = ifm->ifa_flags; 4815 4816 /* We ignore other flags so far. */ 4817 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | 4818 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE | 4819 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC; 4820 4821 idev = ipv6_find_idev(dev); 4822 if (IS_ERR(idev)) 4823 return PTR_ERR(idev); 4824 4825 if (!ipv6_allow_optimistic_dad(net, idev)) 4826 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC; 4827 4828 if (cfg.ifa_flags & IFA_F_NODAD && 4829 cfg.ifa_flags & IFA_F_OPTIMISTIC) { 4830 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive"); 4831 return -EINVAL; 4832 } 4833 4834 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1); 4835 if (!ifa) { 4836 /* 4837 * It would be best to check for !NLM_F_CREATE here but 4838 * userspace already relies on not having to provide this. 4839 */ 4840 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack); 4841 } 4842 4843 if (nlh->nlmsg_flags & NLM_F_EXCL || 4844 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4845 err = -EEXIST; 4846 else 4847 err = inet6_addr_modify(ifa, &cfg); 4848 4849 in6_ifa_put(ifa); 4850 4851 return err; 4852 } 4853 4854 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4855 u8 scope, int ifindex) 4856 { 4857 struct ifaddrmsg *ifm; 4858 4859 ifm = nlmsg_data(nlh); 4860 ifm->ifa_family = AF_INET6; 4861 ifm->ifa_prefixlen = prefixlen; 4862 ifm->ifa_flags = flags; 4863 ifm->ifa_scope = scope; 4864 ifm->ifa_index = ifindex; 4865 } 4866 4867 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4868 unsigned long tstamp, u32 preferred, u32 valid) 4869 { 4870 struct ifa_cacheinfo ci; 4871 4872 ci.cstamp = cstamp_delta(cstamp); 4873 ci.tstamp = cstamp_delta(tstamp); 4874 ci.ifa_prefered = preferred; 4875 ci.ifa_valid = valid; 4876 4877 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4878 } 4879 4880 static inline int rt_scope(int ifa_scope) 4881 { 4882 if (ifa_scope & IFA_HOST) 4883 return RT_SCOPE_HOST; 4884 else if (ifa_scope & IFA_LINK) 4885 return RT_SCOPE_LINK; 4886 else if (ifa_scope & IFA_SITE) 4887 return RT_SCOPE_SITE; 4888 else 4889 return RT_SCOPE_UNIVERSE; 4890 } 4891 4892 static inline int inet6_ifaddr_msgsize(void) 4893 { 4894 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4895 + nla_total_size(16) /* IFA_LOCAL */ 4896 + nla_total_size(16) /* IFA_ADDRESS */ 4897 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4898 + nla_total_size(4) /* IFA_FLAGS */ 4899 + nla_total_size(4) /* IFA_RT_PRIORITY */; 4900 } 4901 4902 enum addr_type_t { 4903 UNICAST_ADDR, 4904 MULTICAST_ADDR, 4905 ANYCAST_ADDR, 4906 }; 4907 4908 struct inet6_fill_args { 4909 u32 portid; 4910 u32 seq; 4911 int event; 4912 unsigned int flags; 4913 int netnsid; 4914 int ifindex; 4915 enum addr_type_t type; 4916 }; 4917 4918 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4919 struct inet6_fill_args *args) 4920 { 4921 struct nlmsghdr *nlh; 4922 u32 preferred, valid; 4923 4924 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 4925 sizeof(struct ifaddrmsg), args->flags); 4926 if (!nlh) 4927 return -EMSGSIZE; 4928 4929 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4930 ifa->idev->dev->ifindex); 4931 4932 if (args->netnsid >= 0 && 4933 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 4934 goto error; 4935 4936 if (!((ifa->flags&IFA_F_PERMANENT) && 4937 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4938 preferred = ifa->prefered_lft; 4939 valid = ifa->valid_lft; 4940 if (preferred != INFINITY_LIFE_TIME) { 4941 long tval = (jiffies - ifa->tstamp)/HZ; 4942 if (preferred > tval) 4943 preferred -= tval; 4944 else 4945 preferred = 0; 4946 if (valid != INFINITY_LIFE_TIME) { 4947 if (valid > tval) 4948 valid -= tval; 4949 else 4950 valid = 0; 4951 } 4952 } 4953 } else { 4954 preferred = INFINITY_LIFE_TIME; 4955 valid = INFINITY_LIFE_TIME; 4956 } 4957 4958 if (!ipv6_addr_any(&ifa->peer_addr)) { 4959 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4960 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4961 goto error; 4962 } else 4963 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4964 goto error; 4965 4966 if (ifa->rt_priority && 4967 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority)) 4968 goto error; 4969 4970 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4971 goto error; 4972 4973 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4974 goto error; 4975 4976 nlmsg_end(skb, nlh); 4977 return 0; 4978 4979 error: 4980 nlmsg_cancel(skb, nlh); 4981 return -EMSGSIZE; 4982 } 4983 4984 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4985 struct inet6_fill_args *args) 4986 { 4987 struct nlmsghdr *nlh; 4988 u8 scope = RT_SCOPE_UNIVERSE; 4989 int ifindex = ifmca->idev->dev->ifindex; 4990 4991 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4992 scope = RT_SCOPE_SITE; 4993 4994 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 4995 sizeof(struct ifaddrmsg), args->flags); 4996 if (!nlh) 4997 return -EMSGSIZE; 4998 4999 if (args->netnsid >= 0 && 5000 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 5001 return -EMSGSIZE; 5002 5003 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5004 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 5005 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 5006 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5007 nlmsg_cancel(skb, nlh); 5008 return -EMSGSIZE; 5009 } 5010 5011 nlmsg_end(skb, nlh); 5012 return 0; 5013 } 5014 5015 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 5016 struct inet6_fill_args *args) 5017 { 5018 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt); 5019 int ifindex = dev ? dev->ifindex : 1; 5020 struct nlmsghdr *nlh; 5021 u8 scope = RT_SCOPE_UNIVERSE; 5022 5023 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 5024 scope = RT_SCOPE_SITE; 5025 5026 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5027 sizeof(struct ifaddrmsg), args->flags); 5028 if (!nlh) 5029 return -EMSGSIZE; 5030 5031 if (args->netnsid >= 0 && 5032 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 5033 return -EMSGSIZE; 5034 5035 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5036 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 5037 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 5038 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5039 nlmsg_cancel(skb, nlh); 5040 return -EMSGSIZE; 5041 } 5042 5043 nlmsg_end(skb, nlh); 5044 return 0; 5045 } 5046 5047 /* called with rcu_read_lock() */ 5048 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 5049 struct netlink_callback *cb, int s_ip_idx, 5050 struct inet6_fill_args *fillargs) 5051 { 5052 struct ifmcaddr6 *ifmca; 5053 struct ifacaddr6 *ifaca; 5054 int ip_idx = 0; 5055 int err = 1; 5056 5057 read_lock_bh(&idev->lock); 5058 switch (fillargs->type) { 5059 case UNICAST_ADDR: { 5060 struct inet6_ifaddr *ifa; 5061 fillargs->event = RTM_NEWADDR; 5062 5063 /* unicast address incl. temp addr */ 5064 list_for_each_entry(ifa, &idev->addr_list, if_list) { 5065 if (ip_idx < s_ip_idx) 5066 goto next; 5067 err = inet6_fill_ifaddr(skb, ifa, fillargs); 5068 if (err < 0) 5069 break; 5070 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 5071 next: 5072 ip_idx++; 5073 } 5074 break; 5075 } 5076 case MULTICAST_ADDR: 5077 fillargs->event = RTM_GETMULTICAST; 5078 5079 /* multicast address */ 5080 for (ifmca = idev->mc_list; ifmca; 5081 ifmca = ifmca->next, ip_idx++) { 5082 if (ip_idx < s_ip_idx) 5083 continue; 5084 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs); 5085 if (err < 0) 5086 break; 5087 } 5088 break; 5089 case ANYCAST_ADDR: 5090 fillargs->event = RTM_GETANYCAST; 5091 /* anycast address */ 5092 for (ifaca = idev->ac_list; ifaca; 5093 ifaca = ifaca->aca_next, ip_idx++) { 5094 if (ip_idx < s_ip_idx) 5095 continue; 5096 err = inet6_fill_ifacaddr(skb, ifaca, fillargs); 5097 if (err < 0) 5098 break; 5099 } 5100 break; 5101 default: 5102 break; 5103 } 5104 read_unlock_bh(&idev->lock); 5105 cb->args[2] = ip_idx; 5106 return err; 5107 } 5108 5109 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh, 5110 struct inet6_fill_args *fillargs, 5111 struct net **tgt_net, struct sock *sk, 5112 struct netlink_callback *cb) 5113 { 5114 struct netlink_ext_ack *extack = cb->extack; 5115 struct nlattr *tb[IFA_MAX+1]; 5116 struct ifaddrmsg *ifm; 5117 int err, i; 5118 5119 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5120 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request"); 5121 return -EINVAL; 5122 } 5123 5124 ifm = nlmsg_data(nlh); 5125 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5126 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request"); 5127 return -EINVAL; 5128 } 5129 5130 fillargs->ifindex = ifm->ifa_index; 5131 if (fillargs->ifindex) { 5132 cb->answer_flags |= NLM_F_DUMP_FILTERED; 5133 fillargs->flags |= NLM_F_DUMP_FILTERED; 5134 } 5135 5136 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5137 ifa_ipv6_policy, extack); 5138 if (err < 0) 5139 return err; 5140 5141 for (i = 0; i <= IFA_MAX; ++i) { 5142 if (!tb[i]) 5143 continue; 5144 5145 if (i == IFA_TARGET_NETNSID) { 5146 struct net *net; 5147 5148 fillargs->netnsid = nla_get_s32(tb[i]); 5149 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid); 5150 if (IS_ERR(net)) { 5151 fillargs->netnsid = -1; 5152 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id"); 5153 return PTR_ERR(net); 5154 } 5155 *tgt_net = net; 5156 } else { 5157 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); 5158 return -EINVAL; 5159 } 5160 } 5161 5162 return 0; 5163 } 5164 5165 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 5166 enum addr_type_t type) 5167 { 5168 const struct nlmsghdr *nlh = cb->nlh; 5169 struct inet6_fill_args fillargs = { 5170 .portid = NETLINK_CB(cb->skb).portid, 5171 .seq = cb->nlh->nlmsg_seq, 5172 .flags = NLM_F_MULTI, 5173 .netnsid = -1, 5174 .type = type, 5175 }; 5176 struct net *net = sock_net(skb->sk); 5177 struct net *tgt_net = net; 5178 int idx, s_idx, s_ip_idx; 5179 int h, s_h; 5180 struct net_device *dev; 5181 struct inet6_dev *idev; 5182 struct hlist_head *head; 5183 int err = 0; 5184 5185 s_h = cb->args[0]; 5186 s_idx = idx = cb->args[1]; 5187 s_ip_idx = cb->args[2]; 5188 5189 if (cb->strict_check) { 5190 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net, 5191 skb->sk, cb); 5192 if (err < 0) 5193 goto put_tgt_net; 5194 5195 err = 0; 5196 if (fillargs.ifindex) { 5197 dev = __dev_get_by_index(tgt_net, fillargs.ifindex); 5198 if (!dev) { 5199 err = -ENODEV; 5200 goto put_tgt_net; 5201 } 5202 idev = __in6_dev_get(dev); 5203 if (idev) { 5204 err = in6_dump_addrs(idev, skb, cb, s_ip_idx, 5205 &fillargs); 5206 if (err > 0) 5207 err = 0; 5208 } 5209 goto put_tgt_net; 5210 } 5211 } 5212 5213 rcu_read_lock(); 5214 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq; 5215 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5216 idx = 0; 5217 head = &tgt_net->dev_index_head[h]; 5218 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5219 if (idx < s_idx) 5220 goto cont; 5221 if (h > s_h || idx > s_idx) 5222 s_ip_idx = 0; 5223 idev = __in6_dev_get(dev); 5224 if (!idev) 5225 goto cont; 5226 5227 if (in6_dump_addrs(idev, skb, cb, s_ip_idx, 5228 &fillargs) < 0) 5229 goto done; 5230 cont: 5231 idx++; 5232 } 5233 } 5234 done: 5235 rcu_read_unlock(); 5236 cb->args[0] = h; 5237 cb->args[1] = idx; 5238 put_tgt_net: 5239 if (fillargs.netnsid >= 0) 5240 put_net(tgt_net); 5241 5242 return skb->len ? : err; 5243 } 5244 5245 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 5246 { 5247 enum addr_type_t type = UNICAST_ADDR; 5248 5249 return inet6_dump_addr(skb, cb, type); 5250 } 5251 5252 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 5253 { 5254 enum addr_type_t type = MULTICAST_ADDR; 5255 5256 return inet6_dump_addr(skb, cb, type); 5257 } 5258 5259 5260 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 5261 { 5262 enum addr_type_t type = ANYCAST_ADDR; 5263 5264 return inet6_dump_addr(skb, cb, type); 5265 } 5266 5267 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb, 5268 const struct nlmsghdr *nlh, 5269 struct nlattr **tb, 5270 struct netlink_ext_ack *extack) 5271 { 5272 struct ifaddrmsg *ifm; 5273 int i, err; 5274 5275 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5276 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request"); 5277 return -EINVAL; 5278 } 5279 5280 if (!netlink_strict_get_check(skb)) 5281 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 5282 ifa_ipv6_policy, extack); 5283 5284 ifm = nlmsg_data(nlh); 5285 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5286 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request"); 5287 return -EINVAL; 5288 } 5289 5290 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5291 ifa_ipv6_policy, extack); 5292 if (err) 5293 return err; 5294 5295 for (i = 0; i <= IFA_MAX; i++) { 5296 if (!tb[i]) 5297 continue; 5298 5299 switch (i) { 5300 case IFA_TARGET_NETNSID: 5301 case IFA_ADDRESS: 5302 case IFA_LOCAL: 5303 break; 5304 default: 5305 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request"); 5306 return -EINVAL; 5307 } 5308 } 5309 5310 return 0; 5311 } 5312 5313 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 5314 struct netlink_ext_ack *extack) 5315 { 5316 struct net *net = sock_net(in_skb->sk); 5317 struct inet6_fill_args fillargs = { 5318 .portid = NETLINK_CB(in_skb).portid, 5319 .seq = nlh->nlmsg_seq, 5320 .event = RTM_NEWADDR, 5321 .flags = 0, 5322 .netnsid = -1, 5323 }; 5324 struct net *tgt_net = net; 5325 struct ifaddrmsg *ifm; 5326 struct nlattr *tb[IFA_MAX+1]; 5327 struct in6_addr *addr = NULL, *peer; 5328 struct net_device *dev = NULL; 5329 struct inet6_ifaddr *ifa; 5330 struct sk_buff *skb; 5331 int err; 5332 5333 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack); 5334 if (err < 0) 5335 return err; 5336 5337 if (tb[IFA_TARGET_NETNSID]) { 5338 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]); 5339 5340 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk, 5341 fillargs.netnsid); 5342 if (IS_ERR(tgt_net)) 5343 return PTR_ERR(tgt_net); 5344 } 5345 5346 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 5347 if (!addr) 5348 return -EINVAL; 5349 5350 ifm = nlmsg_data(nlh); 5351 if (ifm->ifa_index) 5352 dev = dev_get_by_index(tgt_net, ifm->ifa_index); 5353 5354 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1); 5355 if (!ifa) { 5356 err = -EADDRNOTAVAIL; 5357 goto errout; 5358 } 5359 5360 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 5361 if (!skb) { 5362 err = -ENOBUFS; 5363 goto errout_ifa; 5364 } 5365 5366 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5367 if (err < 0) { 5368 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5369 WARN_ON(err == -EMSGSIZE); 5370 kfree_skb(skb); 5371 goto errout_ifa; 5372 } 5373 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid); 5374 errout_ifa: 5375 in6_ifa_put(ifa); 5376 errout: 5377 if (dev) 5378 dev_put(dev); 5379 if (fillargs.netnsid >= 0) 5380 put_net(tgt_net); 5381 5382 return err; 5383 } 5384 5385 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 5386 { 5387 struct sk_buff *skb; 5388 struct net *net = dev_net(ifa->idev->dev); 5389 struct inet6_fill_args fillargs = { 5390 .portid = 0, 5391 .seq = 0, 5392 .event = event, 5393 .flags = 0, 5394 .netnsid = -1, 5395 }; 5396 int err = -ENOBUFS; 5397 5398 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 5399 if (!skb) 5400 goto errout; 5401 5402 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5403 if (err < 0) { 5404 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5405 WARN_ON(err == -EMSGSIZE); 5406 kfree_skb(skb); 5407 goto errout; 5408 } 5409 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 5410 return; 5411 errout: 5412 if (err < 0) 5413 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 5414 } 5415 5416 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 5417 __s32 *array, int bytes) 5418 { 5419 BUG_ON(bytes < (DEVCONF_MAX * 4)); 5420 5421 memset(array, 0, bytes); 5422 array[DEVCONF_FORWARDING] = cnf->forwarding; 5423 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 5424 array[DEVCONF_MTU6] = cnf->mtu6; 5425 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 5426 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 5427 array[DEVCONF_AUTOCONF] = cnf->autoconf; 5428 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 5429 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 5430 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5431 jiffies_to_msecs(cnf->rtr_solicit_interval); 5432 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5433 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 5434 array[DEVCONF_RTR_SOLICIT_DELAY] = 5435 jiffies_to_msecs(cnf->rtr_solicit_delay); 5436 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 5437 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5438 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 5439 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5440 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 5441 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 5442 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 5443 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 5444 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 5445 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 5446 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 5447 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 5448 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 5449 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 5450 #ifdef CONFIG_IPV6_ROUTER_PREF 5451 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 5452 array[DEVCONF_RTR_PROBE_INTERVAL] = 5453 jiffies_to_msecs(cnf->rtr_probe_interval); 5454 #ifdef CONFIG_IPV6_ROUTE_INFO 5455 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen; 5456 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 5457 #endif 5458 #endif 5459 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 5460 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 5461 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5462 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 5463 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 5464 #endif 5465 #ifdef CONFIG_IPV6_MROUTE 5466 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 5467 #endif 5468 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 5469 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 5470 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 5471 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 5472 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 5473 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 5474 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 5475 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 5476 /* we omit DEVCONF_STABLE_SECRET for now */ 5477 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 5478 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 5479 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 5480 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5481 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5482 #ifdef CONFIG_IPV6_SEG6_HMAC 5483 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5484 #endif 5485 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5486 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5487 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy; 5488 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass; 5489 array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled; 5490 } 5491 5492 static inline size_t inet6_ifla6_size(void) 5493 { 5494 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5495 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5496 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5497 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5498 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5499 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */ 5500 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */ 5501 + 0; 5502 } 5503 5504 static inline size_t inet6_if_nlmsg_size(void) 5505 { 5506 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5507 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5508 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5509 + nla_total_size(4) /* IFLA_MTU */ 5510 + nla_total_size(4) /* IFLA_LINK */ 5511 + nla_total_size(1) /* IFLA_OPERSTATE */ 5512 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5513 } 5514 5515 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5516 int bytes) 5517 { 5518 int i; 5519 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5520 BUG_ON(pad < 0); 5521 5522 /* Use put_unaligned() because stats may not be aligned for u64. */ 5523 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5524 for (i = 1; i < ICMP6_MIB_MAX; i++) 5525 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5526 5527 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5528 } 5529 5530 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5531 int bytes, size_t syncpoff) 5532 { 5533 int i, c; 5534 u64 buff[IPSTATS_MIB_MAX]; 5535 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5536 5537 BUG_ON(pad < 0); 5538 5539 memset(buff, 0, sizeof(buff)); 5540 buff[0] = IPSTATS_MIB_MAX; 5541 5542 for_each_possible_cpu(c) { 5543 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5544 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5545 } 5546 5547 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5548 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5549 } 5550 5551 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5552 int bytes) 5553 { 5554 switch (attrtype) { 5555 case IFLA_INET6_STATS: 5556 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5557 offsetof(struct ipstats_mib, syncp)); 5558 break; 5559 case IFLA_INET6_ICMP6STATS: 5560 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5561 break; 5562 } 5563 } 5564 5565 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5566 u32 ext_filter_mask) 5567 { 5568 struct nlattr *nla; 5569 struct ifla_cacheinfo ci; 5570 5571 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5572 goto nla_put_failure; 5573 ci.max_reasm_len = IPV6_MAXPLEN; 5574 ci.tstamp = cstamp_delta(idev->tstamp); 5575 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5576 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5577 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5578 goto nla_put_failure; 5579 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5580 if (!nla) 5581 goto nla_put_failure; 5582 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5583 5584 /* XXX - MC not implemented */ 5585 5586 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5587 return 0; 5588 5589 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5590 if (!nla) 5591 goto nla_put_failure; 5592 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5593 5594 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5595 if (!nla) 5596 goto nla_put_failure; 5597 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5598 5599 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5600 if (!nla) 5601 goto nla_put_failure; 5602 read_lock_bh(&idev->lock); 5603 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5604 read_unlock_bh(&idev->lock); 5605 5606 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5607 goto nla_put_failure; 5608 5609 return 0; 5610 5611 nla_put_failure: 5612 return -EMSGSIZE; 5613 } 5614 5615 static size_t inet6_get_link_af_size(const struct net_device *dev, 5616 u32 ext_filter_mask) 5617 { 5618 if (!__in6_dev_get(dev)) 5619 return 0; 5620 5621 return inet6_ifla6_size(); 5622 } 5623 5624 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5625 u32 ext_filter_mask) 5626 { 5627 struct inet6_dev *idev = __in6_dev_get(dev); 5628 5629 if (!idev) 5630 return -ENODATA; 5631 5632 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5633 return -EMSGSIZE; 5634 5635 return 0; 5636 } 5637 5638 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 5639 { 5640 struct inet6_ifaddr *ifp; 5641 struct net_device *dev = idev->dev; 5642 bool clear_token, update_rs = false; 5643 struct in6_addr ll_addr; 5644 5645 ASSERT_RTNL(); 5646 5647 if (!token) 5648 return -EINVAL; 5649 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 5650 return -EINVAL; 5651 if (!ipv6_accept_ra(idev)) 5652 return -EINVAL; 5653 if (idev->cnf.rtr_solicits == 0) 5654 return -EINVAL; 5655 5656 write_lock_bh(&idev->lock); 5657 5658 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5659 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5660 5661 write_unlock_bh(&idev->lock); 5662 5663 clear_token = ipv6_addr_any(token); 5664 if (clear_token) 5665 goto update_lft; 5666 5667 if (!idev->dead && (idev->if_flags & IF_READY) && 5668 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5669 IFA_F_OPTIMISTIC)) { 5670 /* If we're not ready, then normal ifup will take care 5671 * of this. Otherwise, we need to request our rs here. 5672 */ 5673 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5674 update_rs = true; 5675 } 5676 5677 update_lft: 5678 write_lock_bh(&idev->lock); 5679 5680 if (update_rs) { 5681 idev->if_flags |= IF_RS_SENT; 5682 idev->rs_interval = rfc3315_s14_backoff_init( 5683 idev->cnf.rtr_solicit_interval); 5684 idev->rs_probes = 1; 5685 addrconf_mod_rs_timer(idev, idev->rs_interval); 5686 } 5687 5688 /* Well, that's kinda nasty ... */ 5689 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5690 spin_lock(&ifp->lock); 5691 if (ifp->tokenized) { 5692 ifp->valid_lft = 0; 5693 ifp->prefered_lft = 0; 5694 } 5695 spin_unlock(&ifp->lock); 5696 } 5697 5698 write_unlock_bh(&idev->lock); 5699 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5700 addrconf_verify_rtnl(); 5701 return 0; 5702 } 5703 5704 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5705 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5706 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5707 }; 5708 5709 static int check_addr_gen_mode(int mode) 5710 { 5711 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5712 mode != IN6_ADDR_GEN_MODE_NONE && 5713 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5714 mode != IN6_ADDR_GEN_MODE_RANDOM) 5715 return -EINVAL; 5716 return 1; 5717 } 5718 5719 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5720 int mode) 5721 { 5722 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5723 !idev->cnf.stable_secret.initialized && 5724 !net->ipv6.devconf_dflt->stable_secret.initialized) 5725 return -EINVAL; 5726 return 1; 5727 } 5728 5729 static int inet6_validate_link_af(const struct net_device *dev, 5730 const struct nlattr *nla) 5731 { 5732 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5733 struct inet6_dev *idev = NULL; 5734 int err; 5735 5736 if (dev) { 5737 idev = __in6_dev_get(dev); 5738 if (!idev) 5739 return -EAFNOSUPPORT; 5740 } 5741 5742 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, 5743 inet6_af_policy, NULL); 5744 if (err) 5745 return err; 5746 5747 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE]) 5748 return -EINVAL; 5749 5750 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5751 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5752 5753 if (check_addr_gen_mode(mode) < 0) 5754 return -EINVAL; 5755 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0) 5756 return -EINVAL; 5757 } 5758 5759 return 0; 5760 } 5761 5762 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 5763 { 5764 struct inet6_dev *idev = __in6_dev_get(dev); 5765 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5766 int err; 5767 5768 if (!idev) 5769 return -EAFNOSUPPORT; 5770 5771 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 5772 BUG(); 5773 5774 if (tb[IFLA_INET6_TOKEN]) { 5775 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 5776 if (err) 5777 return err; 5778 } 5779 5780 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5781 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5782 5783 idev->cnf.addr_gen_mode = mode; 5784 } 5785 5786 return 0; 5787 } 5788 5789 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5790 u32 portid, u32 seq, int event, unsigned int flags) 5791 { 5792 struct net_device *dev = idev->dev; 5793 struct ifinfomsg *hdr; 5794 struct nlmsghdr *nlh; 5795 void *protoinfo; 5796 5797 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5798 if (!nlh) 5799 return -EMSGSIZE; 5800 5801 hdr = nlmsg_data(nlh); 5802 hdr->ifi_family = AF_INET6; 5803 hdr->__ifi_pad = 0; 5804 hdr->ifi_type = dev->type; 5805 hdr->ifi_index = dev->ifindex; 5806 hdr->ifi_flags = dev_get_flags(dev); 5807 hdr->ifi_change = 0; 5808 5809 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5810 (dev->addr_len && 5811 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5812 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5813 (dev->ifindex != dev_get_iflink(dev) && 5814 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5815 nla_put_u8(skb, IFLA_OPERSTATE, 5816 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5817 goto nla_put_failure; 5818 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO); 5819 if (!protoinfo) 5820 goto nla_put_failure; 5821 5822 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5823 goto nla_put_failure; 5824 5825 nla_nest_end(skb, protoinfo); 5826 nlmsg_end(skb, nlh); 5827 return 0; 5828 5829 nla_put_failure: 5830 nlmsg_cancel(skb, nlh); 5831 return -EMSGSIZE; 5832 } 5833 5834 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh, 5835 struct netlink_ext_ack *extack) 5836 { 5837 struct ifinfomsg *ifm; 5838 5839 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5840 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request"); 5841 return -EINVAL; 5842 } 5843 5844 if (nlmsg_attrlen(nlh, sizeof(*ifm))) { 5845 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header"); 5846 return -EINVAL; 5847 } 5848 5849 ifm = nlmsg_data(nlh); 5850 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || 5851 ifm->ifi_change || ifm->ifi_index) { 5852 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request"); 5853 return -EINVAL; 5854 } 5855 5856 return 0; 5857 } 5858 5859 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5860 { 5861 struct net *net = sock_net(skb->sk); 5862 int h, s_h; 5863 int idx = 0, s_idx; 5864 struct net_device *dev; 5865 struct inet6_dev *idev; 5866 struct hlist_head *head; 5867 5868 /* only requests using strict checking can pass data to 5869 * influence the dump 5870 */ 5871 if (cb->strict_check) { 5872 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack); 5873 5874 if (err < 0) 5875 return err; 5876 } 5877 5878 s_h = cb->args[0]; 5879 s_idx = cb->args[1]; 5880 5881 rcu_read_lock(); 5882 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5883 idx = 0; 5884 head = &net->dev_index_head[h]; 5885 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5886 if (idx < s_idx) 5887 goto cont; 5888 idev = __in6_dev_get(dev); 5889 if (!idev) 5890 goto cont; 5891 if (inet6_fill_ifinfo(skb, idev, 5892 NETLINK_CB(cb->skb).portid, 5893 cb->nlh->nlmsg_seq, 5894 RTM_NEWLINK, NLM_F_MULTI) < 0) 5895 goto out; 5896 cont: 5897 idx++; 5898 } 5899 } 5900 out: 5901 rcu_read_unlock(); 5902 cb->args[1] = idx; 5903 cb->args[0] = h; 5904 5905 return skb->len; 5906 } 5907 5908 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5909 { 5910 struct sk_buff *skb; 5911 struct net *net = dev_net(idev->dev); 5912 int err = -ENOBUFS; 5913 5914 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5915 if (!skb) 5916 goto errout; 5917 5918 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5919 if (err < 0) { 5920 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5921 WARN_ON(err == -EMSGSIZE); 5922 kfree_skb(skb); 5923 goto errout; 5924 } 5925 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5926 return; 5927 errout: 5928 if (err < 0) 5929 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5930 } 5931 5932 static inline size_t inet6_prefix_nlmsg_size(void) 5933 { 5934 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5935 + nla_total_size(sizeof(struct in6_addr)) 5936 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5937 } 5938 5939 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5940 struct prefix_info *pinfo, u32 portid, u32 seq, 5941 int event, unsigned int flags) 5942 { 5943 struct prefixmsg *pmsg; 5944 struct nlmsghdr *nlh; 5945 struct prefix_cacheinfo ci; 5946 5947 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5948 if (!nlh) 5949 return -EMSGSIZE; 5950 5951 pmsg = nlmsg_data(nlh); 5952 pmsg->prefix_family = AF_INET6; 5953 pmsg->prefix_pad1 = 0; 5954 pmsg->prefix_pad2 = 0; 5955 pmsg->prefix_ifindex = idev->dev->ifindex; 5956 pmsg->prefix_len = pinfo->prefix_len; 5957 pmsg->prefix_type = pinfo->type; 5958 pmsg->prefix_pad3 = 0; 5959 pmsg->prefix_flags = 0; 5960 if (pinfo->onlink) 5961 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 5962 if (pinfo->autoconf) 5963 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 5964 5965 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5966 goto nla_put_failure; 5967 ci.preferred_time = ntohl(pinfo->prefered); 5968 ci.valid_time = ntohl(pinfo->valid); 5969 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 5970 goto nla_put_failure; 5971 nlmsg_end(skb, nlh); 5972 return 0; 5973 5974 nla_put_failure: 5975 nlmsg_cancel(skb, nlh); 5976 return -EMSGSIZE; 5977 } 5978 5979 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 5980 struct prefix_info *pinfo) 5981 { 5982 struct sk_buff *skb; 5983 struct net *net = dev_net(idev->dev); 5984 int err = -ENOBUFS; 5985 5986 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 5987 if (!skb) 5988 goto errout; 5989 5990 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5991 if (err < 0) { 5992 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5993 WARN_ON(err == -EMSGSIZE); 5994 kfree_skb(skb); 5995 goto errout; 5996 } 5997 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5998 return; 5999 errout: 6000 if (err < 0) 6001 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 6002 } 6003 6004 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6005 { 6006 struct net *net = dev_net(ifp->idev->dev); 6007 6008 if (event) 6009 ASSERT_RTNL(); 6010 6011 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 6012 6013 switch (event) { 6014 case RTM_NEWADDR: 6015 /* 6016 * If the address was optimistic we inserted the route at the 6017 * start of our DAD process, so we don't need to do it again. 6018 * If the device was taken down in the middle of the DAD 6019 * cycle there is a race where we could get here without a 6020 * host route, so nothing to insert. That will be fixed when 6021 * the device is brought up. 6022 */ 6023 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) { 6024 ip6_ins_rt(net, ifp->rt); 6025 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) { 6026 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n", 6027 &ifp->addr, ifp->idev->dev->name); 6028 } 6029 6030 if (ifp->idev->cnf.forwarding) 6031 addrconf_join_anycast(ifp); 6032 if (!ipv6_addr_any(&ifp->peer_addr)) 6033 addrconf_prefix_route(&ifp->peer_addr, 128, 6034 ifp->rt_priority, ifp->idev->dev, 6035 0, 0, GFP_ATOMIC); 6036 break; 6037 case RTM_DELADDR: 6038 if (ifp->idev->cnf.forwarding) 6039 addrconf_leave_anycast(ifp); 6040 addrconf_leave_solict(ifp->idev, &ifp->addr); 6041 if (!ipv6_addr_any(&ifp->peer_addr)) { 6042 struct fib6_info *rt; 6043 6044 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 6045 ifp->idev->dev, 0, 0, 6046 false); 6047 if (rt) 6048 ip6_del_rt(net, rt, false); 6049 } 6050 if (ifp->rt) { 6051 ip6_del_rt(net, ifp->rt, false); 6052 ifp->rt = NULL; 6053 } 6054 rt_genid_bump_ipv6(net); 6055 break; 6056 } 6057 atomic_inc(&net->ipv6.dev_addr_genid); 6058 } 6059 6060 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6061 { 6062 rcu_read_lock_bh(); 6063 if (likely(ifp->idev->dead == 0)) 6064 __ipv6_ifa_notify(event, ifp); 6065 rcu_read_unlock_bh(); 6066 } 6067 6068 #ifdef CONFIG_SYSCTL 6069 6070 static int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 6071 void *buffer, size_t *lenp, loff_t *ppos) 6072 { 6073 int *valp = ctl->data; 6074 int val = *valp; 6075 loff_t pos = *ppos; 6076 struct ctl_table lctl; 6077 int ret; 6078 6079 /* 6080 * ctl->data points to idev->cnf.forwarding, we should 6081 * not modify it until we get the rtnl lock. 6082 */ 6083 lctl = *ctl; 6084 lctl.data = &val; 6085 6086 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6087 6088 if (write) 6089 ret = addrconf_fixup_forwarding(ctl, valp, val); 6090 if (ret) 6091 *ppos = pos; 6092 return ret; 6093 } 6094 6095 static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 6096 void *buffer, size_t *lenp, loff_t *ppos) 6097 { 6098 struct inet6_dev *idev = ctl->extra1; 6099 int min_mtu = IPV6_MIN_MTU; 6100 struct ctl_table lctl; 6101 6102 lctl = *ctl; 6103 lctl.extra1 = &min_mtu; 6104 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 6105 6106 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 6107 } 6108 6109 static void dev_disable_change(struct inet6_dev *idev) 6110 { 6111 struct netdev_notifier_info info; 6112 6113 if (!idev || !idev->dev) 6114 return; 6115 6116 netdev_notifier_info_init(&info, idev->dev); 6117 if (idev->cnf.disable_ipv6) 6118 addrconf_notify(NULL, NETDEV_DOWN, &info); 6119 else 6120 addrconf_notify(NULL, NETDEV_UP, &info); 6121 } 6122 6123 static void addrconf_disable_change(struct net *net, __s32 newf) 6124 { 6125 struct net_device *dev; 6126 struct inet6_dev *idev; 6127 6128 for_each_netdev(net, dev) { 6129 idev = __in6_dev_get(dev); 6130 if (idev) { 6131 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 6132 idev->cnf.disable_ipv6 = newf; 6133 if (changed) 6134 dev_disable_change(idev); 6135 } 6136 } 6137 } 6138 6139 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 6140 { 6141 struct net *net; 6142 int old; 6143 6144 if (!rtnl_trylock()) 6145 return restart_syscall(); 6146 6147 net = (struct net *)table->extra2; 6148 old = *p; 6149 *p = newf; 6150 6151 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 6152 rtnl_unlock(); 6153 return 0; 6154 } 6155 6156 if (p == &net->ipv6.devconf_all->disable_ipv6) { 6157 net->ipv6.devconf_dflt->disable_ipv6 = newf; 6158 addrconf_disable_change(net, newf); 6159 } else if ((!newf) ^ (!old)) 6160 dev_disable_change((struct inet6_dev *)table->extra1); 6161 6162 rtnl_unlock(); 6163 return 0; 6164 } 6165 6166 static int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 6167 void *buffer, size_t *lenp, loff_t *ppos) 6168 { 6169 int *valp = ctl->data; 6170 int val = *valp; 6171 loff_t pos = *ppos; 6172 struct ctl_table lctl; 6173 int ret; 6174 6175 /* 6176 * ctl->data points to idev->cnf.disable_ipv6, we should 6177 * not modify it until we get the rtnl lock. 6178 */ 6179 lctl = *ctl; 6180 lctl.data = &val; 6181 6182 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6183 6184 if (write) 6185 ret = addrconf_disable_ipv6(ctl, valp, val); 6186 if (ret) 6187 *ppos = pos; 6188 return ret; 6189 } 6190 6191 static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 6192 void *buffer, size_t *lenp, loff_t *ppos) 6193 { 6194 int *valp = ctl->data; 6195 int ret; 6196 int old, new; 6197 6198 old = *valp; 6199 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 6200 new = *valp; 6201 6202 if (write && old != new) { 6203 struct net *net = ctl->extra2; 6204 6205 if (!rtnl_trylock()) 6206 return restart_syscall(); 6207 6208 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 6209 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6210 NETCONFA_PROXY_NEIGH, 6211 NETCONFA_IFINDEX_DEFAULT, 6212 net->ipv6.devconf_dflt); 6213 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 6214 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6215 NETCONFA_PROXY_NEIGH, 6216 NETCONFA_IFINDEX_ALL, 6217 net->ipv6.devconf_all); 6218 else { 6219 struct inet6_dev *idev = ctl->extra1; 6220 6221 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6222 NETCONFA_PROXY_NEIGH, 6223 idev->dev->ifindex, 6224 &idev->cnf); 6225 } 6226 rtnl_unlock(); 6227 } 6228 6229 return ret; 6230 } 6231 6232 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 6233 void *buffer, size_t *lenp, 6234 loff_t *ppos) 6235 { 6236 int ret = 0; 6237 u32 new_val; 6238 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 6239 struct net *net = (struct net *)ctl->extra2; 6240 struct ctl_table tmp = { 6241 .data = &new_val, 6242 .maxlen = sizeof(new_val), 6243 .mode = ctl->mode, 6244 }; 6245 6246 if (!rtnl_trylock()) 6247 return restart_syscall(); 6248 6249 new_val = *((u32 *)ctl->data); 6250 6251 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos); 6252 if (ret != 0) 6253 goto out; 6254 6255 if (write) { 6256 if (check_addr_gen_mode(new_val) < 0) { 6257 ret = -EINVAL; 6258 goto out; 6259 } 6260 6261 if (idev) { 6262 if (check_stable_privacy(idev, net, new_val) < 0) { 6263 ret = -EINVAL; 6264 goto out; 6265 } 6266 6267 if (idev->cnf.addr_gen_mode != new_val) { 6268 idev->cnf.addr_gen_mode = new_val; 6269 addrconf_dev_config(idev->dev); 6270 } 6271 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) { 6272 struct net_device *dev; 6273 6274 net->ipv6.devconf_dflt->addr_gen_mode = new_val; 6275 for_each_netdev(net, dev) { 6276 idev = __in6_dev_get(dev); 6277 if (idev && 6278 idev->cnf.addr_gen_mode != new_val) { 6279 idev->cnf.addr_gen_mode = new_val; 6280 addrconf_dev_config(idev->dev); 6281 } 6282 } 6283 } 6284 6285 *((u32 *)ctl->data) = new_val; 6286 } 6287 6288 out: 6289 rtnl_unlock(); 6290 6291 return ret; 6292 } 6293 6294 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 6295 void *buffer, size_t *lenp, 6296 loff_t *ppos) 6297 { 6298 int err; 6299 struct in6_addr addr; 6300 char str[IPV6_MAX_STRLEN]; 6301 struct ctl_table lctl = *ctl; 6302 struct net *net = ctl->extra2; 6303 struct ipv6_stable_secret *secret = ctl->data; 6304 6305 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 6306 return -EIO; 6307 6308 lctl.maxlen = IPV6_MAX_STRLEN; 6309 lctl.data = str; 6310 6311 if (!rtnl_trylock()) 6312 return restart_syscall(); 6313 6314 if (!write && !secret->initialized) { 6315 err = -EIO; 6316 goto out; 6317 } 6318 6319 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 6320 if (err >= sizeof(str)) { 6321 err = -EIO; 6322 goto out; 6323 } 6324 6325 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 6326 if (err || !write) 6327 goto out; 6328 6329 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 6330 err = -EIO; 6331 goto out; 6332 } 6333 6334 secret->initialized = true; 6335 secret->secret = addr; 6336 6337 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 6338 struct net_device *dev; 6339 6340 for_each_netdev(net, dev) { 6341 struct inet6_dev *idev = __in6_dev_get(dev); 6342 6343 if (idev) { 6344 idev->cnf.addr_gen_mode = 6345 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6346 } 6347 } 6348 } else { 6349 struct inet6_dev *idev = ctl->extra1; 6350 6351 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6352 } 6353 6354 out: 6355 rtnl_unlock(); 6356 6357 return err; 6358 } 6359 6360 static 6361 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 6362 int write, void *buffer, 6363 size_t *lenp, 6364 loff_t *ppos) 6365 { 6366 int *valp = ctl->data; 6367 int val = *valp; 6368 loff_t pos = *ppos; 6369 struct ctl_table lctl; 6370 int ret; 6371 6372 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 6373 * we should not modify it until we get the rtnl lock. 6374 */ 6375 lctl = *ctl; 6376 lctl.data = &val; 6377 6378 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6379 6380 if (write) 6381 ret = addrconf_fixup_linkdown(ctl, valp, val); 6382 if (ret) 6383 *ppos = pos; 6384 return ret; 6385 } 6386 6387 static 6388 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 6389 { 6390 if (rt) { 6391 if (action) 6392 rt->dst.flags |= DST_NOPOLICY; 6393 else 6394 rt->dst.flags &= ~DST_NOPOLICY; 6395 } 6396 } 6397 6398 static 6399 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 6400 { 6401 struct inet6_ifaddr *ifa; 6402 6403 read_lock_bh(&idev->lock); 6404 list_for_each_entry(ifa, &idev->addr_list, if_list) { 6405 spin_lock(&ifa->lock); 6406 if (ifa->rt) { 6407 /* host routes only use builtin fib6_nh */ 6408 struct fib6_nh *nh = ifa->rt->fib6_nh; 6409 int cpu; 6410 6411 rcu_read_lock(); 6412 ifa->rt->dst_nopolicy = val ? true : false; 6413 if (nh->rt6i_pcpu) { 6414 for_each_possible_cpu(cpu) { 6415 struct rt6_info **rtp; 6416 6417 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu); 6418 addrconf_set_nopolicy(*rtp, val); 6419 } 6420 } 6421 rcu_read_unlock(); 6422 } 6423 spin_unlock(&ifa->lock); 6424 } 6425 read_unlock_bh(&idev->lock); 6426 } 6427 6428 static 6429 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 6430 { 6431 struct inet6_dev *idev; 6432 struct net *net; 6433 6434 if (!rtnl_trylock()) 6435 return restart_syscall(); 6436 6437 *valp = val; 6438 6439 net = (struct net *)ctl->extra2; 6440 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 6441 rtnl_unlock(); 6442 return 0; 6443 } 6444 6445 if (valp == &net->ipv6.devconf_all->disable_policy) { 6446 struct net_device *dev; 6447 6448 for_each_netdev(net, dev) { 6449 idev = __in6_dev_get(dev); 6450 if (idev) 6451 addrconf_disable_policy_idev(idev, val); 6452 } 6453 } else { 6454 idev = (struct inet6_dev *)ctl->extra1; 6455 addrconf_disable_policy_idev(idev, val); 6456 } 6457 6458 rtnl_unlock(); 6459 return 0; 6460 } 6461 6462 static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 6463 void *buffer, size_t *lenp, loff_t *ppos) 6464 { 6465 int *valp = ctl->data; 6466 int val = *valp; 6467 loff_t pos = *ppos; 6468 struct ctl_table lctl; 6469 int ret; 6470 6471 lctl = *ctl; 6472 lctl.data = &val; 6473 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6474 6475 if (write && (*valp != val)) 6476 ret = addrconf_disable_policy(ctl, valp, val); 6477 6478 if (ret) 6479 *ppos = pos; 6480 6481 return ret; 6482 } 6483 6484 static int minus_one = -1; 6485 static const int two_five_five = 255; 6486 6487 static const struct ctl_table addrconf_sysctl[] = { 6488 { 6489 .procname = "forwarding", 6490 .data = &ipv6_devconf.forwarding, 6491 .maxlen = sizeof(int), 6492 .mode = 0644, 6493 .proc_handler = addrconf_sysctl_forward, 6494 }, 6495 { 6496 .procname = "hop_limit", 6497 .data = &ipv6_devconf.hop_limit, 6498 .maxlen = sizeof(int), 6499 .mode = 0644, 6500 .proc_handler = proc_dointvec_minmax, 6501 .extra1 = (void *)SYSCTL_ONE, 6502 .extra2 = (void *)&two_five_five, 6503 }, 6504 { 6505 .procname = "mtu", 6506 .data = &ipv6_devconf.mtu6, 6507 .maxlen = sizeof(int), 6508 .mode = 0644, 6509 .proc_handler = addrconf_sysctl_mtu, 6510 }, 6511 { 6512 .procname = "accept_ra", 6513 .data = &ipv6_devconf.accept_ra, 6514 .maxlen = sizeof(int), 6515 .mode = 0644, 6516 .proc_handler = proc_dointvec, 6517 }, 6518 { 6519 .procname = "accept_redirects", 6520 .data = &ipv6_devconf.accept_redirects, 6521 .maxlen = sizeof(int), 6522 .mode = 0644, 6523 .proc_handler = proc_dointvec, 6524 }, 6525 { 6526 .procname = "autoconf", 6527 .data = &ipv6_devconf.autoconf, 6528 .maxlen = sizeof(int), 6529 .mode = 0644, 6530 .proc_handler = proc_dointvec, 6531 }, 6532 { 6533 .procname = "dad_transmits", 6534 .data = &ipv6_devconf.dad_transmits, 6535 .maxlen = sizeof(int), 6536 .mode = 0644, 6537 .proc_handler = proc_dointvec, 6538 }, 6539 { 6540 .procname = "router_solicitations", 6541 .data = &ipv6_devconf.rtr_solicits, 6542 .maxlen = sizeof(int), 6543 .mode = 0644, 6544 .proc_handler = proc_dointvec_minmax, 6545 .extra1 = &minus_one, 6546 }, 6547 { 6548 .procname = "router_solicitation_interval", 6549 .data = &ipv6_devconf.rtr_solicit_interval, 6550 .maxlen = sizeof(int), 6551 .mode = 0644, 6552 .proc_handler = proc_dointvec_jiffies, 6553 }, 6554 { 6555 .procname = "router_solicitation_max_interval", 6556 .data = &ipv6_devconf.rtr_solicit_max_interval, 6557 .maxlen = sizeof(int), 6558 .mode = 0644, 6559 .proc_handler = proc_dointvec_jiffies, 6560 }, 6561 { 6562 .procname = "router_solicitation_delay", 6563 .data = &ipv6_devconf.rtr_solicit_delay, 6564 .maxlen = sizeof(int), 6565 .mode = 0644, 6566 .proc_handler = proc_dointvec_jiffies, 6567 }, 6568 { 6569 .procname = "force_mld_version", 6570 .data = &ipv6_devconf.force_mld_version, 6571 .maxlen = sizeof(int), 6572 .mode = 0644, 6573 .proc_handler = proc_dointvec, 6574 }, 6575 { 6576 .procname = "mldv1_unsolicited_report_interval", 6577 .data = 6578 &ipv6_devconf.mldv1_unsolicited_report_interval, 6579 .maxlen = sizeof(int), 6580 .mode = 0644, 6581 .proc_handler = proc_dointvec_ms_jiffies, 6582 }, 6583 { 6584 .procname = "mldv2_unsolicited_report_interval", 6585 .data = 6586 &ipv6_devconf.mldv2_unsolicited_report_interval, 6587 .maxlen = sizeof(int), 6588 .mode = 0644, 6589 .proc_handler = proc_dointvec_ms_jiffies, 6590 }, 6591 { 6592 .procname = "use_tempaddr", 6593 .data = &ipv6_devconf.use_tempaddr, 6594 .maxlen = sizeof(int), 6595 .mode = 0644, 6596 .proc_handler = proc_dointvec, 6597 }, 6598 { 6599 .procname = "temp_valid_lft", 6600 .data = &ipv6_devconf.temp_valid_lft, 6601 .maxlen = sizeof(int), 6602 .mode = 0644, 6603 .proc_handler = proc_dointvec, 6604 }, 6605 { 6606 .procname = "temp_prefered_lft", 6607 .data = &ipv6_devconf.temp_prefered_lft, 6608 .maxlen = sizeof(int), 6609 .mode = 0644, 6610 .proc_handler = proc_dointvec, 6611 }, 6612 { 6613 .procname = "regen_max_retry", 6614 .data = &ipv6_devconf.regen_max_retry, 6615 .maxlen = sizeof(int), 6616 .mode = 0644, 6617 .proc_handler = proc_dointvec, 6618 }, 6619 { 6620 .procname = "max_desync_factor", 6621 .data = &ipv6_devconf.max_desync_factor, 6622 .maxlen = sizeof(int), 6623 .mode = 0644, 6624 .proc_handler = proc_dointvec, 6625 }, 6626 { 6627 .procname = "max_addresses", 6628 .data = &ipv6_devconf.max_addresses, 6629 .maxlen = sizeof(int), 6630 .mode = 0644, 6631 .proc_handler = proc_dointvec, 6632 }, 6633 { 6634 .procname = "accept_ra_defrtr", 6635 .data = &ipv6_devconf.accept_ra_defrtr, 6636 .maxlen = sizeof(int), 6637 .mode = 0644, 6638 .proc_handler = proc_dointvec, 6639 }, 6640 { 6641 .procname = "accept_ra_min_hop_limit", 6642 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6643 .maxlen = sizeof(int), 6644 .mode = 0644, 6645 .proc_handler = proc_dointvec, 6646 }, 6647 { 6648 .procname = "accept_ra_pinfo", 6649 .data = &ipv6_devconf.accept_ra_pinfo, 6650 .maxlen = sizeof(int), 6651 .mode = 0644, 6652 .proc_handler = proc_dointvec, 6653 }, 6654 #ifdef CONFIG_IPV6_ROUTER_PREF 6655 { 6656 .procname = "accept_ra_rtr_pref", 6657 .data = &ipv6_devconf.accept_ra_rtr_pref, 6658 .maxlen = sizeof(int), 6659 .mode = 0644, 6660 .proc_handler = proc_dointvec, 6661 }, 6662 { 6663 .procname = "router_probe_interval", 6664 .data = &ipv6_devconf.rtr_probe_interval, 6665 .maxlen = sizeof(int), 6666 .mode = 0644, 6667 .proc_handler = proc_dointvec_jiffies, 6668 }, 6669 #ifdef CONFIG_IPV6_ROUTE_INFO 6670 { 6671 .procname = "accept_ra_rt_info_min_plen", 6672 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6673 .maxlen = sizeof(int), 6674 .mode = 0644, 6675 .proc_handler = proc_dointvec, 6676 }, 6677 { 6678 .procname = "accept_ra_rt_info_max_plen", 6679 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6680 .maxlen = sizeof(int), 6681 .mode = 0644, 6682 .proc_handler = proc_dointvec, 6683 }, 6684 #endif 6685 #endif 6686 { 6687 .procname = "proxy_ndp", 6688 .data = &ipv6_devconf.proxy_ndp, 6689 .maxlen = sizeof(int), 6690 .mode = 0644, 6691 .proc_handler = addrconf_sysctl_proxy_ndp, 6692 }, 6693 { 6694 .procname = "accept_source_route", 6695 .data = &ipv6_devconf.accept_source_route, 6696 .maxlen = sizeof(int), 6697 .mode = 0644, 6698 .proc_handler = proc_dointvec, 6699 }, 6700 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6701 { 6702 .procname = "optimistic_dad", 6703 .data = &ipv6_devconf.optimistic_dad, 6704 .maxlen = sizeof(int), 6705 .mode = 0644, 6706 .proc_handler = proc_dointvec, 6707 }, 6708 { 6709 .procname = "use_optimistic", 6710 .data = &ipv6_devconf.use_optimistic, 6711 .maxlen = sizeof(int), 6712 .mode = 0644, 6713 .proc_handler = proc_dointvec, 6714 }, 6715 #endif 6716 #ifdef CONFIG_IPV6_MROUTE 6717 { 6718 .procname = "mc_forwarding", 6719 .data = &ipv6_devconf.mc_forwarding, 6720 .maxlen = sizeof(int), 6721 .mode = 0444, 6722 .proc_handler = proc_dointvec, 6723 }, 6724 #endif 6725 { 6726 .procname = "disable_ipv6", 6727 .data = &ipv6_devconf.disable_ipv6, 6728 .maxlen = sizeof(int), 6729 .mode = 0644, 6730 .proc_handler = addrconf_sysctl_disable, 6731 }, 6732 { 6733 .procname = "accept_dad", 6734 .data = &ipv6_devconf.accept_dad, 6735 .maxlen = sizeof(int), 6736 .mode = 0644, 6737 .proc_handler = proc_dointvec, 6738 }, 6739 { 6740 .procname = "force_tllao", 6741 .data = &ipv6_devconf.force_tllao, 6742 .maxlen = sizeof(int), 6743 .mode = 0644, 6744 .proc_handler = proc_dointvec 6745 }, 6746 { 6747 .procname = "ndisc_notify", 6748 .data = &ipv6_devconf.ndisc_notify, 6749 .maxlen = sizeof(int), 6750 .mode = 0644, 6751 .proc_handler = proc_dointvec 6752 }, 6753 { 6754 .procname = "suppress_frag_ndisc", 6755 .data = &ipv6_devconf.suppress_frag_ndisc, 6756 .maxlen = sizeof(int), 6757 .mode = 0644, 6758 .proc_handler = proc_dointvec 6759 }, 6760 { 6761 .procname = "accept_ra_from_local", 6762 .data = &ipv6_devconf.accept_ra_from_local, 6763 .maxlen = sizeof(int), 6764 .mode = 0644, 6765 .proc_handler = proc_dointvec, 6766 }, 6767 { 6768 .procname = "accept_ra_mtu", 6769 .data = &ipv6_devconf.accept_ra_mtu, 6770 .maxlen = sizeof(int), 6771 .mode = 0644, 6772 .proc_handler = proc_dointvec, 6773 }, 6774 { 6775 .procname = "stable_secret", 6776 .data = &ipv6_devconf.stable_secret, 6777 .maxlen = IPV6_MAX_STRLEN, 6778 .mode = 0600, 6779 .proc_handler = addrconf_sysctl_stable_secret, 6780 }, 6781 { 6782 .procname = "use_oif_addrs_only", 6783 .data = &ipv6_devconf.use_oif_addrs_only, 6784 .maxlen = sizeof(int), 6785 .mode = 0644, 6786 .proc_handler = proc_dointvec, 6787 }, 6788 { 6789 .procname = "ignore_routes_with_linkdown", 6790 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6791 .maxlen = sizeof(int), 6792 .mode = 0644, 6793 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6794 }, 6795 { 6796 .procname = "drop_unicast_in_l2_multicast", 6797 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6798 .maxlen = sizeof(int), 6799 .mode = 0644, 6800 .proc_handler = proc_dointvec, 6801 }, 6802 { 6803 .procname = "drop_unsolicited_na", 6804 .data = &ipv6_devconf.drop_unsolicited_na, 6805 .maxlen = sizeof(int), 6806 .mode = 0644, 6807 .proc_handler = proc_dointvec, 6808 }, 6809 { 6810 .procname = "keep_addr_on_down", 6811 .data = &ipv6_devconf.keep_addr_on_down, 6812 .maxlen = sizeof(int), 6813 .mode = 0644, 6814 .proc_handler = proc_dointvec, 6815 6816 }, 6817 { 6818 .procname = "seg6_enabled", 6819 .data = &ipv6_devconf.seg6_enabled, 6820 .maxlen = sizeof(int), 6821 .mode = 0644, 6822 .proc_handler = proc_dointvec, 6823 }, 6824 #ifdef CONFIG_IPV6_SEG6_HMAC 6825 { 6826 .procname = "seg6_require_hmac", 6827 .data = &ipv6_devconf.seg6_require_hmac, 6828 .maxlen = sizeof(int), 6829 .mode = 0644, 6830 .proc_handler = proc_dointvec, 6831 }, 6832 #endif 6833 { 6834 .procname = "enhanced_dad", 6835 .data = &ipv6_devconf.enhanced_dad, 6836 .maxlen = sizeof(int), 6837 .mode = 0644, 6838 .proc_handler = proc_dointvec, 6839 }, 6840 { 6841 .procname = "addr_gen_mode", 6842 .data = &ipv6_devconf.addr_gen_mode, 6843 .maxlen = sizeof(int), 6844 .mode = 0644, 6845 .proc_handler = addrconf_sysctl_addr_gen_mode, 6846 }, 6847 { 6848 .procname = "disable_policy", 6849 .data = &ipv6_devconf.disable_policy, 6850 .maxlen = sizeof(int), 6851 .mode = 0644, 6852 .proc_handler = addrconf_sysctl_disable_policy, 6853 }, 6854 { 6855 .procname = "ndisc_tclass", 6856 .data = &ipv6_devconf.ndisc_tclass, 6857 .maxlen = sizeof(int), 6858 .mode = 0644, 6859 .proc_handler = proc_dointvec_minmax, 6860 .extra1 = (void *)SYSCTL_ZERO, 6861 .extra2 = (void *)&two_five_five, 6862 }, 6863 { 6864 .procname = "rpl_seg_enabled", 6865 .data = &ipv6_devconf.rpl_seg_enabled, 6866 .maxlen = sizeof(int), 6867 .mode = 0644, 6868 .proc_handler = proc_dointvec, 6869 }, 6870 { 6871 /* sentinel */ 6872 } 6873 }; 6874 6875 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 6876 struct inet6_dev *idev, struct ipv6_devconf *p) 6877 { 6878 int i, ifindex; 6879 struct ctl_table *table; 6880 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 6881 6882 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 6883 if (!table) 6884 goto out; 6885 6886 for (i = 0; table[i].data; i++) { 6887 table[i].data += (char *)p - (char *)&ipv6_devconf; 6888 /* If one of these is already set, then it is not safe to 6889 * overwrite either of them: this makes proc_dointvec_minmax 6890 * usable. 6891 */ 6892 if (!table[i].extra1 && !table[i].extra2) { 6893 table[i].extra1 = idev; /* embedded; no ref */ 6894 table[i].extra2 = net; 6895 } 6896 } 6897 6898 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 6899 6900 p->sysctl_header = register_net_sysctl(net, path, table); 6901 if (!p->sysctl_header) 6902 goto free; 6903 6904 if (!strcmp(dev_name, "all")) 6905 ifindex = NETCONFA_IFINDEX_ALL; 6906 else if (!strcmp(dev_name, "default")) 6907 ifindex = NETCONFA_IFINDEX_DEFAULT; 6908 else 6909 ifindex = idev->dev->ifindex; 6910 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 6911 ifindex, p); 6912 return 0; 6913 6914 free: 6915 kfree(table); 6916 out: 6917 return -ENOBUFS; 6918 } 6919 6920 static void __addrconf_sysctl_unregister(struct net *net, 6921 struct ipv6_devconf *p, int ifindex) 6922 { 6923 struct ctl_table *table; 6924 6925 if (!p->sysctl_header) 6926 return; 6927 6928 table = p->sysctl_header->ctl_table_arg; 6929 unregister_net_sysctl_table(p->sysctl_header); 6930 p->sysctl_header = NULL; 6931 kfree(table); 6932 6933 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 6934 } 6935 6936 static int addrconf_sysctl_register(struct inet6_dev *idev) 6937 { 6938 int err; 6939 6940 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 6941 return -EINVAL; 6942 6943 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 6944 &ndisc_ifinfo_sysctl_change); 6945 if (err) 6946 return err; 6947 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 6948 idev, &idev->cnf); 6949 if (err) 6950 neigh_sysctl_unregister(idev->nd_parms); 6951 6952 return err; 6953 } 6954 6955 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 6956 { 6957 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 6958 idev->dev->ifindex); 6959 neigh_sysctl_unregister(idev->nd_parms); 6960 } 6961 6962 6963 #endif 6964 6965 static int __net_init addrconf_init_net(struct net *net) 6966 { 6967 int err = -ENOMEM; 6968 struct ipv6_devconf *all, *dflt; 6969 6970 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 6971 if (!all) 6972 goto err_alloc_all; 6973 6974 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 6975 if (!dflt) 6976 goto err_alloc_dflt; 6977 6978 if (IS_ENABLED(CONFIG_SYSCTL) && 6979 !net_eq(net, &init_net)) { 6980 switch (sysctl_devconf_inherit_init_net) { 6981 case 1: /* copy from init_net */ 6982 memcpy(all, init_net.ipv6.devconf_all, 6983 sizeof(ipv6_devconf)); 6984 memcpy(dflt, init_net.ipv6.devconf_dflt, 6985 sizeof(ipv6_devconf_dflt)); 6986 break; 6987 case 3: /* copy from the current netns */ 6988 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all, 6989 sizeof(ipv6_devconf)); 6990 memcpy(dflt, 6991 current->nsproxy->net_ns->ipv6.devconf_dflt, 6992 sizeof(ipv6_devconf_dflt)); 6993 break; 6994 case 0: 6995 case 2: 6996 /* use compiled values */ 6997 break; 6998 } 6999 } 7000 7001 /* these will be inherited by all namespaces */ 7002 dflt->autoconf = ipv6_defaults.autoconf; 7003 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 7004 7005 dflt->stable_secret.initialized = false; 7006 all->stable_secret.initialized = false; 7007 7008 net->ipv6.devconf_all = all; 7009 net->ipv6.devconf_dflt = dflt; 7010 7011 #ifdef CONFIG_SYSCTL 7012 err = __addrconf_sysctl_register(net, "all", NULL, all); 7013 if (err < 0) 7014 goto err_reg_all; 7015 7016 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 7017 if (err < 0) 7018 goto err_reg_dflt; 7019 #endif 7020 return 0; 7021 7022 #ifdef CONFIG_SYSCTL 7023 err_reg_dflt: 7024 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 7025 err_reg_all: 7026 kfree(dflt); 7027 #endif 7028 err_alloc_dflt: 7029 kfree(all); 7030 err_alloc_all: 7031 return err; 7032 } 7033 7034 static void __net_exit addrconf_exit_net(struct net *net) 7035 { 7036 #ifdef CONFIG_SYSCTL 7037 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 7038 NETCONFA_IFINDEX_DEFAULT); 7039 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 7040 NETCONFA_IFINDEX_ALL); 7041 #endif 7042 kfree(net->ipv6.devconf_dflt); 7043 kfree(net->ipv6.devconf_all); 7044 } 7045 7046 static struct pernet_operations addrconf_ops = { 7047 .init = addrconf_init_net, 7048 .exit = addrconf_exit_net, 7049 }; 7050 7051 static struct rtnl_af_ops inet6_ops __read_mostly = { 7052 .family = AF_INET6, 7053 .fill_link_af = inet6_fill_link_af, 7054 .get_link_af_size = inet6_get_link_af_size, 7055 .validate_link_af = inet6_validate_link_af, 7056 .set_link_af = inet6_set_link_af, 7057 }; 7058 7059 /* 7060 * Init / cleanup code 7061 */ 7062 7063 int __init addrconf_init(void) 7064 { 7065 struct inet6_dev *idev; 7066 int i, err; 7067 7068 err = ipv6_addr_label_init(); 7069 if (err < 0) { 7070 pr_crit("%s: cannot initialize default policy table: %d\n", 7071 __func__, err); 7072 goto out; 7073 } 7074 7075 err = register_pernet_subsys(&addrconf_ops); 7076 if (err < 0) 7077 goto out_addrlabel; 7078 7079 addrconf_wq = create_workqueue("ipv6_addrconf"); 7080 if (!addrconf_wq) { 7081 err = -ENOMEM; 7082 goto out_nowq; 7083 } 7084 7085 /* The addrconf netdev notifier requires that loopback_dev 7086 * has it's ipv6 private information allocated and setup 7087 * before it can bring up and give link-local addresses 7088 * to other devices which are up. 7089 * 7090 * Unfortunately, loopback_dev is not necessarily the first 7091 * entry in the global dev_base list of net devices. In fact, 7092 * it is likely to be the very last entry on that list. 7093 * So this causes the notifier registry below to try and 7094 * give link-local addresses to all devices besides loopback_dev 7095 * first, then loopback_dev, which cases all the non-loopback_dev 7096 * devices to fail to get a link-local address. 7097 * 7098 * So, as a temporary fix, allocate the ipv6 structure for 7099 * loopback_dev first by hand. 7100 * Longer term, all of the dependencies ipv6 has upon the loopback 7101 * device and it being up should be removed. 7102 */ 7103 rtnl_lock(); 7104 idev = ipv6_add_dev(init_net.loopback_dev); 7105 rtnl_unlock(); 7106 if (IS_ERR(idev)) { 7107 err = PTR_ERR(idev); 7108 goto errlo; 7109 } 7110 7111 ip6_route_init_special_entries(); 7112 7113 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7114 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 7115 7116 register_netdevice_notifier(&ipv6_dev_notf); 7117 7118 addrconf_verify(); 7119 7120 rtnl_af_register(&inet6_ops); 7121 7122 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK, 7123 NULL, inet6_dump_ifinfo, 0); 7124 if (err < 0) 7125 goto errout; 7126 7127 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR, 7128 inet6_rtm_newaddr, NULL, 0); 7129 if (err < 0) 7130 goto errout; 7131 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR, 7132 inet6_rtm_deladdr, NULL, 0); 7133 if (err < 0) 7134 goto errout; 7135 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR, 7136 inet6_rtm_getaddr, inet6_dump_ifaddr, 7137 RTNL_FLAG_DOIT_UNLOCKED); 7138 if (err < 0) 7139 goto errout; 7140 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST, 7141 NULL, inet6_dump_ifmcaddr, 0); 7142 if (err < 0) 7143 goto errout; 7144 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST, 7145 NULL, inet6_dump_ifacaddr, 0); 7146 if (err < 0) 7147 goto errout; 7148 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF, 7149 inet6_netconf_get_devconf, 7150 inet6_netconf_dump_devconf, 7151 RTNL_FLAG_DOIT_UNLOCKED); 7152 if (err < 0) 7153 goto errout; 7154 err = ipv6_addr_label_rtnl_register(); 7155 if (err < 0) 7156 goto errout; 7157 7158 return 0; 7159 errout: 7160 rtnl_unregister_all(PF_INET6); 7161 rtnl_af_unregister(&inet6_ops); 7162 unregister_netdevice_notifier(&ipv6_dev_notf); 7163 errlo: 7164 destroy_workqueue(addrconf_wq); 7165 out_nowq: 7166 unregister_pernet_subsys(&addrconf_ops); 7167 out_addrlabel: 7168 ipv6_addr_label_cleanup(); 7169 out: 7170 return err; 7171 } 7172 7173 void addrconf_cleanup(void) 7174 { 7175 struct net_device *dev; 7176 int i; 7177 7178 unregister_netdevice_notifier(&ipv6_dev_notf); 7179 unregister_pernet_subsys(&addrconf_ops); 7180 ipv6_addr_label_cleanup(); 7181 7182 rtnl_af_unregister(&inet6_ops); 7183 7184 rtnl_lock(); 7185 7186 /* clean dev list */ 7187 for_each_netdev(&init_net, dev) { 7188 if (__in6_dev_get(dev) == NULL) 7189 continue; 7190 addrconf_ifdown(dev, 1); 7191 } 7192 addrconf_ifdown(init_net.loopback_dev, 2); 7193 7194 /* 7195 * Check hash table. 7196 */ 7197 spin_lock_bh(&addrconf_hash_lock); 7198 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7199 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 7200 spin_unlock_bh(&addrconf_hash_lock); 7201 cancel_delayed_work(&addr_chk_work); 7202 rtnl_unlock(); 7203 7204 destroy_workqueue(addrconf_wq); 7205 } 7206