1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * IPv6 Address [auto]configuration 4 * Linux INET6 implementation 5 * 6 * Authors: 7 * Pedro Roque <roque@di.fc.ul.pt> 8 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 9 */ 10 11 /* 12 * Changes: 13 * 14 * Janos Farkas : delete timer on ifdown 15 * <chexum@bankinf.banki.hu> 16 * Andi Kleen : kill double kfree on module 17 * unload. 18 * Maciej W. Rozycki : FDDI support 19 * sekiya@USAGI : Don't send too many RS 20 * packets. 21 * yoshfuji@USAGI : Fixed interval between DAD 22 * packets. 23 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 24 * address validation timer. 25 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 26 * support. 27 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 28 * address on a same interface. 29 * YOSHIFUJI Hideaki @USAGI : ARCnet support 30 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 31 * seq_file. 32 * YOSHIFUJI Hideaki @USAGI : improved source address 33 * selection; consider scope, 34 * status etc. 35 */ 36 37 #define pr_fmt(fmt) "IPv6: " fmt 38 39 #include <linux/errno.h> 40 #include <linux/types.h> 41 #include <linux/kernel.h> 42 #include <linux/sched/signal.h> 43 #include <linux/socket.h> 44 #include <linux/sockios.h> 45 #include <linux/net.h> 46 #include <linux/inet.h> 47 #include <linux/in6.h> 48 #include <linux/netdevice.h> 49 #include <linux/if_addr.h> 50 #include <linux/if_arp.h> 51 #include <linux/if_arcnet.h> 52 #include <linux/if_infiniband.h> 53 #include <linux/route.h> 54 #include <linux/inetdevice.h> 55 #include <linux/init.h> 56 #include <linux/slab.h> 57 #ifdef CONFIG_SYSCTL 58 #include <linux/sysctl.h> 59 #endif 60 #include <linux/capability.h> 61 #include <linux/delay.h> 62 #include <linux/notifier.h> 63 #include <linux/string.h> 64 #include <linux/hash.h> 65 66 #include <net/net_namespace.h> 67 #include <net/sock.h> 68 #include <net/snmp.h> 69 70 #include <net/6lowpan.h> 71 #include <net/firewire.h> 72 #include <net/ipv6.h> 73 #include <net/protocol.h> 74 #include <net/ndisc.h> 75 #include <net/ip6_route.h> 76 #include <net/addrconf.h> 77 #include <net/tcp.h> 78 #include <net/ip.h> 79 #include <net/netlink.h> 80 #include <net/pkt_sched.h> 81 #include <net/l3mdev.h> 82 #include <linux/if_tunnel.h> 83 #include <linux/rtnetlink.h> 84 #include <linux/netconf.h> 85 #include <linux/random.h> 86 #include <linux/uaccess.h> 87 #include <asm/unaligned.h> 88 89 #include <linux/proc_fs.h> 90 #include <linux/seq_file.h> 91 #include <linux/export.h> 92 93 #define INFINITY_LIFE_TIME 0xFFFFFFFF 94 95 #define IPV6_MAX_STRLEN \ 96 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") 97 98 static inline u32 cstamp_delta(unsigned long cstamp) 99 { 100 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 101 } 102 103 static inline s32 rfc3315_s14_backoff_init(s32 irt) 104 { 105 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */ 106 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt; 107 do_div(tmp, 1000000); 108 return (s32)tmp; 109 } 110 111 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt) 112 { 113 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */ 114 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt; 115 do_div(tmp, 1000000); 116 if ((s32)tmp > mrt) { 117 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */ 118 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt; 119 do_div(tmp, 1000000); 120 } 121 return (s32)tmp; 122 } 123 124 #ifdef CONFIG_SYSCTL 125 static int addrconf_sysctl_register(struct inet6_dev *idev); 126 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 127 #else 128 static inline int addrconf_sysctl_register(struct inet6_dev *idev) 129 { 130 return 0; 131 } 132 133 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 134 { 135 } 136 #endif 137 138 static void ipv6_gen_rnd_iid(struct in6_addr *addr); 139 140 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 141 static int ipv6_count_addresses(const struct inet6_dev *idev); 142 static int ipv6_generate_stable_address(struct in6_addr *addr, 143 u8 dad_count, 144 const struct inet6_dev *idev); 145 146 #define IN6_ADDR_HSIZE_SHIFT 8 147 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT) 148 /* 149 * Configured unicast address hash table 150 */ 151 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 152 static DEFINE_SPINLOCK(addrconf_hash_lock); 153 154 static void addrconf_verify(void); 155 static void addrconf_verify_rtnl(void); 156 static void addrconf_verify_work(struct work_struct *); 157 158 static struct workqueue_struct *addrconf_wq; 159 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work); 160 161 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 162 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 163 164 static void addrconf_type_change(struct net_device *dev, 165 unsigned long event); 166 static int addrconf_ifdown(struct net_device *dev, bool unregister); 167 168 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 169 int plen, 170 const struct net_device *dev, 171 u32 flags, u32 noflags, 172 bool no_gw); 173 174 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 175 static void addrconf_dad_work(struct work_struct *w); 176 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 177 bool send_na); 178 static void addrconf_dad_run(struct inet6_dev *idev, bool restart); 179 static void addrconf_rs_timer(struct timer_list *t); 180 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 181 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 182 183 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 184 struct prefix_info *pinfo); 185 186 static struct ipv6_devconf ipv6_devconf __read_mostly = { 187 .forwarding = 0, 188 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 189 .mtu6 = IPV6_MIN_MTU, 190 .accept_ra = 1, 191 .accept_redirects = 1, 192 .autoconf = 1, 193 .force_mld_version = 0, 194 .mldv1_unsolicited_report_interval = 10 * HZ, 195 .mldv2_unsolicited_report_interval = HZ, 196 .dad_transmits = 1, 197 .rtr_solicits = MAX_RTR_SOLICITATIONS, 198 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 199 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 200 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 201 .use_tempaddr = 0, 202 .temp_valid_lft = TEMP_VALID_LIFETIME, 203 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 204 .regen_max_retry = REGEN_MAX_RETRY, 205 .max_desync_factor = MAX_DESYNC_FACTOR, 206 .max_addresses = IPV6_MAX_ADDRESSES, 207 .accept_ra_defrtr = 1, 208 .accept_ra_from_local = 0, 209 .accept_ra_min_hop_limit= 1, 210 .accept_ra_pinfo = 1, 211 #ifdef CONFIG_IPV6_ROUTER_PREF 212 .accept_ra_rtr_pref = 1, 213 .rtr_probe_interval = 60 * HZ, 214 #ifdef CONFIG_IPV6_ROUTE_INFO 215 .accept_ra_rt_info_min_plen = 0, 216 .accept_ra_rt_info_max_plen = 0, 217 #endif 218 #endif 219 .proxy_ndp = 0, 220 .accept_source_route = 0, /* we do not accept RH0 by default. */ 221 .disable_ipv6 = 0, 222 .accept_dad = 0, 223 .suppress_frag_ndisc = 1, 224 .accept_ra_mtu = 1, 225 .stable_secret = { 226 .initialized = false, 227 }, 228 .use_oif_addrs_only = 0, 229 .ignore_routes_with_linkdown = 0, 230 .keep_addr_on_down = 0, 231 .seg6_enabled = 0, 232 #ifdef CONFIG_IPV6_SEG6_HMAC 233 .seg6_require_hmac = 0, 234 #endif 235 .enhanced_dad = 1, 236 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 237 .disable_policy = 0, 238 .rpl_seg_enabled = 0, 239 }; 240 241 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 242 .forwarding = 0, 243 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 244 .mtu6 = IPV6_MIN_MTU, 245 .accept_ra = 1, 246 .accept_redirects = 1, 247 .autoconf = 1, 248 .force_mld_version = 0, 249 .mldv1_unsolicited_report_interval = 10 * HZ, 250 .mldv2_unsolicited_report_interval = HZ, 251 .dad_transmits = 1, 252 .rtr_solicits = MAX_RTR_SOLICITATIONS, 253 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 254 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 255 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 256 .use_tempaddr = 0, 257 .temp_valid_lft = TEMP_VALID_LIFETIME, 258 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 259 .regen_max_retry = REGEN_MAX_RETRY, 260 .max_desync_factor = MAX_DESYNC_FACTOR, 261 .max_addresses = IPV6_MAX_ADDRESSES, 262 .accept_ra_defrtr = 1, 263 .accept_ra_from_local = 0, 264 .accept_ra_min_hop_limit= 1, 265 .accept_ra_pinfo = 1, 266 #ifdef CONFIG_IPV6_ROUTER_PREF 267 .accept_ra_rtr_pref = 1, 268 .rtr_probe_interval = 60 * HZ, 269 #ifdef CONFIG_IPV6_ROUTE_INFO 270 .accept_ra_rt_info_min_plen = 0, 271 .accept_ra_rt_info_max_plen = 0, 272 #endif 273 #endif 274 .proxy_ndp = 0, 275 .accept_source_route = 0, /* we do not accept RH0 by default. */ 276 .disable_ipv6 = 0, 277 .accept_dad = 1, 278 .suppress_frag_ndisc = 1, 279 .accept_ra_mtu = 1, 280 .stable_secret = { 281 .initialized = false, 282 }, 283 .use_oif_addrs_only = 0, 284 .ignore_routes_with_linkdown = 0, 285 .keep_addr_on_down = 0, 286 .seg6_enabled = 0, 287 #ifdef CONFIG_IPV6_SEG6_HMAC 288 .seg6_require_hmac = 0, 289 #endif 290 .enhanced_dad = 1, 291 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 292 .disable_policy = 0, 293 .rpl_seg_enabled = 0, 294 }; 295 296 /* Check if link is ready: is it up and is a valid qdisc available */ 297 static inline bool addrconf_link_ready(const struct net_device *dev) 298 { 299 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev); 300 } 301 302 static void addrconf_del_rs_timer(struct inet6_dev *idev) 303 { 304 if (del_timer(&idev->rs_timer)) 305 __in6_dev_put(idev); 306 } 307 308 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 309 { 310 if (cancel_delayed_work(&ifp->dad_work)) 311 __in6_ifa_put(ifp); 312 } 313 314 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 315 unsigned long when) 316 { 317 if (!timer_pending(&idev->rs_timer)) 318 in6_dev_hold(idev); 319 mod_timer(&idev->rs_timer, jiffies + when); 320 } 321 322 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 323 unsigned long delay) 324 { 325 in6_ifa_hold(ifp); 326 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay)) 327 in6_ifa_put(ifp); 328 } 329 330 static int snmp6_alloc_dev(struct inet6_dev *idev) 331 { 332 int i; 333 334 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib); 335 if (!idev->stats.ipv6) 336 goto err_ip; 337 338 for_each_possible_cpu(i) { 339 struct ipstats_mib *addrconf_stats; 340 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 341 u64_stats_init(&addrconf_stats->syncp); 342 } 343 344 345 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 346 GFP_KERNEL); 347 if (!idev->stats.icmpv6dev) 348 goto err_icmp; 349 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 350 GFP_KERNEL); 351 if (!idev->stats.icmpv6msgdev) 352 goto err_icmpmsg; 353 354 return 0; 355 356 err_icmpmsg: 357 kfree(idev->stats.icmpv6dev); 358 err_icmp: 359 free_percpu(idev->stats.ipv6); 360 err_ip: 361 return -ENOMEM; 362 } 363 364 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 365 { 366 struct inet6_dev *ndev; 367 int err = -ENOMEM; 368 369 ASSERT_RTNL(); 370 371 if (dev->mtu < IPV6_MIN_MTU) 372 return ERR_PTR(-EINVAL); 373 374 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 375 if (!ndev) 376 return ERR_PTR(err); 377 378 rwlock_init(&ndev->lock); 379 ndev->dev = dev; 380 INIT_LIST_HEAD(&ndev->addr_list); 381 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0); 382 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 383 384 if (ndev->cnf.stable_secret.initialized) 385 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 386 387 ndev->cnf.mtu6 = dev->mtu; 388 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 389 if (!ndev->nd_parms) { 390 kfree(ndev); 391 return ERR_PTR(err); 392 } 393 if (ndev->cnf.forwarding) 394 dev_disable_lro(dev); 395 /* We refer to the device */ 396 dev_hold(dev); 397 398 if (snmp6_alloc_dev(ndev) < 0) { 399 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n", 400 __func__); 401 neigh_parms_release(&nd_tbl, ndev->nd_parms); 402 dev_put(dev); 403 kfree(ndev); 404 return ERR_PTR(err); 405 } 406 407 if (snmp6_register_dev(ndev) < 0) { 408 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n", 409 __func__, dev->name); 410 goto err_release; 411 } 412 413 /* One reference from device. */ 414 refcount_set(&ndev->refcnt, 1); 415 416 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 417 ndev->cnf.accept_dad = -1; 418 419 #if IS_ENABLED(CONFIG_IPV6_SIT) 420 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 421 pr_info("%s: Disabled Multicast RS\n", dev->name); 422 ndev->cnf.rtr_solicits = 0; 423 } 424 #endif 425 426 INIT_LIST_HEAD(&ndev->tempaddr_list); 427 ndev->desync_factor = U32_MAX; 428 if ((dev->flags&IFF_LOOPBACK) || 429 dev->type == ARPHRD_TUNNEL || 430 dev->type == ARPHRD_TUNNEL6 || 431 dev->type == ARPHRD_SIT || 432 dev->type == ARPHRD_NONE) { 433 ndev->cnf.use_tempaddr = -1; 434 } 435 436 ndev->token = in6addr_any; 437 438 if (netif_running(dev) && addrconf_link_ready(dev)) 439 ndev->if_flags |= IF_READY; 440 441 ipv6_mc_init_dev(ndev); 442 ndev->tstamp = jiffies; 443 err = addrconf_sysctl_register(ndev); 444 if (err) { 445 ipv6_mc_destroy_dev(ndev); 446 snmp6_unregister_dev(ndev); 447 goto err_release; 448 } 449 /* protected by rtnl_lock */ 450 rcu_assign_pointer(dev->ip6_ptr, ndev); 451 452 /* Join interface-local all-node multicast group */ 453 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 454 455 /* Join all-node multicast group */ 456 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 457 458 /* Join all-router multicast group if forwarding is set */ 459 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 460 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 461 462 return ndev; 463 464 err_release: 465 neigh_parms_release(&nd_tbl, ndev->nd_parms); 466 ndev->dead = 1; 467 in6_dev_finish_destroy(ndev); 468 return ERR_PTR(err); 469 } 470 471 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 472 { 473 struct inet6_dev *idev; 474 475 ASSERT_RTNL(); 476 477 idev = __in6_dev_get(dev); 478 if (!idev) { 479 idev = ipv6_add_dev(dev); 480 if (IS_ERR(idev)) 481 return idev; 482 } 483 484 if (dev->flags&IFF_UP) 485 ipv6_mc_up(idev); 486 return idev; 487 } 488 489 static int inet6_netconf_msgsize_devconf(int type) 490 { 491 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 492 + nla_total_size(4); /* NETCONFA_IFINDEX */ 493 bool all = false; 494 495 if (type == NETCONFA_ALL) 496 all = true; 497 498 if (all || type == NETCONFA_FORWARDING) 499 size += nla_total_size(4); 500 #ifdef CONFIG_IPV6_MROUTE 501 if (all || type == NETCONFA_MC_FORWARDING) 502 size += nla_total_size(4); 503 #endif 504 if (all || type == NETCONFA_PROXY_NEIGH) 505 size += nla_total_size(4); 506 507 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 508 size += nla_total_size(4); 509 510 return size; 511 } 512 513 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 514 struct ipv6_devconf *devconf, u32 portid, 515 u32 seq, int event, unsigned int flags, 516 int type) 517 { 518 struct nlmsghdr *nlh; 519 struct netconfmsg *ncm; 520 bool all = false; 521 522 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 523 flags); 524 if (!nlh) 525 return -EMSGSIZE; 526 527 if (type == NETCONFA_ALL) 528 all = true; 529 530 ncm = nlmsg_data(nlh); 531 ncm->ncm_family = AF_INET6; 532 533 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 534 goto nla_put_failure; 535 536 if (!devconf) 537 goto out; 538 539 if ((all || type == NETCONFA_FORWARDING) && 540 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 541 goto nla_put_failure; 542 #ifdef CONFIG_IPV6_MROUTE 543 if ((all || type == NETCONFA_MC_FORWARDING) && 544 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 545 devconf->mc_forwarding) < 0) 546 goto nla_put_failure; 547 #endif 548 if ((all || type == NETCONFA_PROXY_NEIGH) && 549 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 550 goto nla_put_failure; 551 552 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 553 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 554 devconf->ignore_routes_with_linkdown) < 0) 555 goto nla_put_failure; 556 557 out: 558 nlmsg_end(skb, nlh); 559 return 0; 560 561 nla_put_failure: 562 nlmsg_cancel(skb, nlh); 563 return -EMSGSIZE; 564 } 565 566 void inet6_netconf_notify_devconf(struct net *net, int event, int type, 567 int ifindex, struct ipv6_devconf *devconf) 568 { 569 struct sk_buff *skb; 570 int err = -ENOBUFS; 571 572 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL); 573 if (!skb) 574 goto errout; 575 576 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 577 event, 0, type); 578 if (err < 0) { 579 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 580 WARN_ON(err == -EMSGSIZE); 581 kfree_skb(skb); 582 goto errout; 583 } 584 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL); 585 return; 586 errout: 587 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 588 } 589 590 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 591 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 592 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 593 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 594 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 595 }; 596 597 static int inet6_netconf_valid_get_req(struct sk_buff *skb, 598 const struct nlmsghdr *nlh, 599 struct nlattr **tb, 600 struct netlink_ext_ack *extack) 601 { 602 int i, err; 603 604 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) { 605 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request"); 606 return -EINVAL; 607 } 608 609 if (!netlink_strict_get_check(skb)) 610 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg), 611 tb, NETCONFA_MAX, 612 devconf_ipv6_policy, extack); 613 614 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg), 615 tb, NETCONFA_MAX, 616 devconf_ipv6_policy, extack); 617 if (err) 618 return err; 619 620 for (i = 0; i <= NETCONFA_MAX; i++) { 621 if (!tb[i]) 622 continue; 623 624 switch (i) { 625 case NETCONFA_IFINDEX: 626 break; 627 default: 628 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request"); 629 return -EINVAL; 630 } 631 } 632 633 return 0; 634 } 635 636 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 637 struct nlmsghdr *nlh, 638 struct netlink_ext_ack *extack) 639 { 640 struct net *net = sock_net(in_skb->sk); 641 struct nlattr *tb[NETCONFA_MAX+1]; 642 struct inet6_dev *in6_dev = NULL; 643 struct net_device *dev = NULL; 644 struct sk_buff *skb; 645 struct ipv6_devconf *devconf; 646 int ifindex; 647 int err; 648 649 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack); 650 if (err < 0) 651 return err; 652 653 if (!tb[NETCONFA_IFINDEX]) 654 return -EINVAL; 655 656 err = -EINVAL; 657 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 658 switch (ifindex) { 659 case NETCONFA_IFINDEX_ALL: 660 devconf = net->ipv6.devconf_all; 661 break; 662 case NETCONFA_IFINDEX_DEFAULT: 663 devconf = net->ipv6.devconf_dflt; 664 break; 665 default: 666 dev = dev_get_by_index(net, ifindex); 667 if (!dev) 668 return -EINVAL; 669 in6_dev = in6_dev_get(dev); 670 if (!in6_dev) 671 goto errout; 672 devconf = &in6_dev->cnf; 673 break; 674 } 675 676 err = -ENOBUFS; 677 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); 678 if (!skb) 679 goto errout; 680 681 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 682 NETLINK_CB(in_skb).portid, 683 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 684 NETCONFA_ALL); 685 if (err < 0) { 686 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 687 WARN_ON(err == -EMSGSIZE); 688 kfree_skb(skb); 689 goto errout; 690 } 691 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 692 errout: 693 if (in6_dev) 694 in6_dev_put(in6_dev); 695 if (dev) 696 dev_put(dev); 697 return err; 698 } 699 700 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 701 struct netlink_callback *cb) 702 { 703 const struct nlmsghdr *nlh = cb->nlh; 704 struct net *net = sock_net(skb->sk); 705 int h, s_h; 706 int idx, s_idx; 707 struct net_device *dev; 708 struct inet6_dev *idev; 709 struct hlist_head *head; 710 711 if (cb->strict_check) { 712 struct netlink_ext_ack *extack = cb->extack; 713 struct netconfmsg *ncm; 714 715 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) { 716 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request"); 717 return -EINVAL; 718 } 719 720 if (nlmsg_attrlen(nlh, sizeof(*ncm))) { 721 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request"); 722 return -EINVAL; 723 } 724 } 725 726 s_h = cb->args[0]; 727 s_idx = idx = cb->args[1]; 728 729 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 730 idx = 0; 731 head = &net->dev_index_head[h]; 732 rcu_read_lock(); 733 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 734 net->dev_base_seq; 735 hlist_for_each_entry_rcu(dev, head, index_hlist) { 736 if (idx < s_idx) 737 goto cont; 738 idev = __in6_dev_get(dev); 739 if (!idev) 740 goto cont; 741 742 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 743 &idev->cnf, 744 NETLINK_CB(cb->skb).portid, 745 nlh->nlmsg_seq, 746 RTM_NEWNETCONF, 747 NLM_F_MULTI, 748 NETCONFA_ALL) < 0) { 749 rcu_read_unlock(); 750 goto done; 751 } 752 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 753 cont: 754 idx++; 755 } 756 rcu_read_unlock(); 757 } 758 if (h == NETDEV_HASHENTRIES) { 759 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 760 net->ipv6.devconf_all, 761 NETLINK_CB(cb->skb).portid, 762 nlh->nlmsg_seq, 763 RTM_NEWNETCONF, NLM_F_MULTI, 764 NETCONFA_ALL) < 0) 765 goto done; 766 else 767 h++; 768 } 769 if (h == NETDEV_HASHENTRIES + 1) { 770 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 771 net->ipv6.devconf_dflt, 772 NETLINK_CB(cb->skb).portid, 773 nlh->nlmsg_seq, 774 RTM_NEWNETCONF, NLM_F_MULTI, 775 NETCONFA_ALL) < 0) 776 goto done; 777 else 778 h++; 779 } 780 done: 781 cb->args[0] = h; 782 cb->args[1] = idx; 783 784 return skb->len; 785 } 786 787 #ifdef CONFIG_SYSCTL 788 static void dev_forward_change(struct inet6_dev *idev) 789 { 790 struct net_device *dev; 791 struct inet6_ifaddr *ifa; 792 793 if (!idev) 794 return; 795 dev = idev->dev; 796 if (idev->cnf.forwarding) 797 dev_disable_lro(dev); 798 if (dev->flags & IFF_MULTICAST) { 799 if (idev->cnf.forwarding) { 800 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 801 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 802 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 803 } else { 804 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 805 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 806 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 807 } 808 } 809 810 list_for_each_entry(ifa, &idev->addr_list, if_list) { 811 if (ifa->flags&IFA_F_TENTATIVE) 812 continue; 813 if (idev->cnf.forwarding) 814 addrconf_join_anycast(ifa); 815 else 816 addrconf_leave_anycast(ifa); 817 } 818 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, 819 NETCONFA_FORWARDING, 820 dev->ifindex, &idev->cnf); 821 } 822 823 824 static void addrconf_forward_change(struct net *net, __s32 newf) 825 { 826 struct net_device *dev; 827 struct inet6_dev *idev; 828 829 for_each_netdev(net, dev) { 830 idev = __in6_dev_get(dev); 831 if (idev) { 832 int changed = (!idev->cnf.forwarding) ^ (!newf); 833 idev->cnf.forwarding = newf; 834 if (changed) 835 dev_forward_change(idev); 836 } 837 } 838 } 839 840 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 841 { 842 struct net *net; 843 int old; 844 845 if (!rtnl_trylock()) 846 return restart_syscall(); 847 848 net = (struct net *)table->extra2; 849 old = *p; 850 *p = newf; 851 852 if (p == &net->ipv6.devconf_dflt->forwarding) { 853 if ((!newf) ^ (!old)) 854 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 855 NETCONFA_FORWARDING, 856 NETCONFA_IFINDEX_DEFAULT, 857 net->ipv6.devconf_dflt); 858 rtnl_unlock(); 859 return 0; 860 } 861 862 if (p == &net->ipv6.devconf_all->forwarding) { 863 int old_dflt = net->ipv6.devconf_dflt->forwarding; 864 865 net->ipv6.devconf_dflt->forwarding = newf; 866 if ((!newf) ^ (!old_dflt)) 867 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 868 NETCONFA_FORWARDING, 869 NETCONFA_IFINDEX_DEFAULT, 870 net->ipv6.devconf_dflt); 871 872 addrconf_forward_change(net, newf); 873 if ((!newf) ^ (!old)) 874 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 875 NETCONFA_FORWARDING, 876 NETCONFA_IFINDEX_ALL, 877 net->ipv6.devconf_all); 878 } else if ((!newf) ^ (!old)) 879 dev_forward_change((struct inet6_dev *)table->extra1); 880 rtnl_unlock(); 881 882 if (newf) 883 rt6_purge_dflt_routers(net); 884 return 1; 885 } 886 887 static void addrconf_linkdown_change(struct net *net, __s32 newf) 888 { 889 struct net_device *dev; 890 struct inet6_dev *idev; 891 892 for_each_netdev(net, dev) { 893 idev = __in6_dev_get(dev); 894 if (idev) { 895 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 896 897 idev->cnf.ignore_routes_with_linkdown = newf; 898 if (changed) 899 inet6_netconf_notify_devconf(dev_net(dev), 900 RTM_NEWNETCONF, 901 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 902 dev->ifindex, 903 &idev->cnf); 904 } 905 } 906 } 907 908 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 909 { 910 struct net *net; 911 int old; 912 913 if (!rtnl_trylock()) 914 return restart_syscall(); 915 916 net = (struct net *)table->extra2; 917 old = *p; 918 *p = newf; 919 920 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 921 if ((!newf) ^ (!old)) 922 inet6_netconf_notify_devconf(net, 923 RTM_NEWNETCONF, 924 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 925 NETCONFA_IFINDEX_DEFAULT, 926 net->ipv6.devconf_dflt); 927 rtnl_unlock(); 928 return 0; 929 } 930 931 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 932 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 933 addrconf_linkdown_change(net, newf); 934 if ((!newf) ^ (!old)) 935 inet6_netconf_notify_devconf(net, 936 RTM_NEWNETCONF, 937 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 938 NETCONFA_IFINDEX_ALL, 939 net->ipv6.devconf_all); 940 } 941 rtnl_unlock(); 942 943 return 1; 944 } 945 946 #endif 947 948 /* Nobody refers to this ifaddr, destroy it */ 949 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 950 { 951 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 952 953 #ifdef NET_REFCNT_DEBUG 954 pr_debug("%s\n", __func__); 955 #endif 956 957 in6_dev_put(ifp->idev); 958 959 if (cancel_delayed_work(&ifp->dad_work)) 960 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 961 ifp); 962 963 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 964 pr_warn("Freeing alive inet6 address %p\n", ifp); 965 return; 966 } 967 968 kfree_rcu(ifp, rcu); 969 } 970 971 static void 972 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 973 { 974 struct list_head *p; 975 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 976 977 /* 978 * Each device address list is sorted in order of scope - 979 * global before linklocal. 980 */ 981 list_for_each(p, &idev->addr_list) { 982 struct inet6_ifaddr *ifa 983 = list_entry(p, struct inet6_ifaddr, if_list); 984 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 985 break; 986 } 987 988 list_add_tail_rcu(&ifp->if_list, p); 989 } 990 991 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr) 992 { 993 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net); 994 995 return hash_32(val, IN6_ADDR_HSIZE_SHIFT); 996 } 997 998 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 999 struct net_device *dev, unsigned int hash) 1000 { 1001 struct inet6_ifaddr *ifp; 1002 1003 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1004 if (!net_eq(dev_net(ifp->idev->dev), net)) 1005 continue; 1006 if (ipv6_addr_equal(&ifp->addr, addr)) { 1007 if (!dev || ifp->idev->dev == dev) 1008 return true; 1009 } 1010 } 1011 return false; 1012 } 1013 1014 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa) 1015 { 1016 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr); 1017 int err = 0; 1018 1019 spin_lock(&addrconf_hash_lock); 1020 1021 /* Ignore adding duplicate addresses on an interface */ 1022 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) { 1023 netdev_dbg(dev, "ipv6_add_addr: already assigned\n"); 1024 err = -EEXIST; 1025 } else { 1026 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 1027 } 1028 1029 spin_unlock(&addrconf_hash_lock); 1030 1031 return err; 1032 } 1033 1034 /* On success it returns ifp with increased reference count */ 1035 1036 static struct inet6_ifaddr * 1037 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg, 1038 bool can_block, struct netlink_ext_ack *extack) 1039 { 1040 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC; 1041 int addr_type = ipv6_addr_type(cfg->pfx); 1042 struct net *net = dev_net(idev->dev); 1043 struct inet6_ifaddr *ifa = NULL; 1044 struct fib6_info *f6i = NULL; 1045 int err = 0; 1046 1047 if (addr_type == IPV6_ADDR_ANY || 1048 (addr_type & IPV6_ADDR_MULTICAST && 1049 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) || 1050 (!(idev->dev->flags & IFF_LOOPBACK) && 1051 !netif_is_l3_master(idev->dev) && 1052 addr_type & IPV6_ADDR_LOOPBACK)) 1053 return ERR_PTR(-EADDRNOTAVAIL); 1054 1055 if (idev->dead) { 1056 err = -ENODEV; /*XXX*/ 1057 goto out; 1058 } 1059 1060 if (idev->cnf.disable_ipv6) { 1061 err = -EACCES; 1062 goto out; 1063 } 1064 1065 /* validator notifier needs to be blocking; 1066 * do not call in atomic context 1067 */ 1068 if (can_block) { 1069 struct in6_validator_info i6vi = { 1070 .i6vi_addr = *cfg->pfx, 1071 .i6vi_dev = idev, 1072 .extack = extack, 1073 }; 1074 1075 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi); 1076 err = notifier_to_errno(err); 1077 if (err < 0) 1078 goto out; 1079 } 1080 1081 ifa = kzalloc(sizeof(*ifa), gfp_flags); 1082 if (!ifa) { 1083 err = -ENOBUFS; 1084 goto out; 1085 } 1086 1087 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags); 1088 if (IS_ERR(f6i)) { 1089 err = PTR_ERR(f6i); 1090 f6i = NULL; 1091 goto out; 1092 } 1093 1094 if (net->ipv6.devconf_all->disable_policy || 1095 idev->cnf.disable_policy) 1096 f6i->dst_nopolicy = true; 1097 1098 neigh_parms_data_state_setall(idev->nd_parms); 1099 1100 ifa->addr = *cfg->pfx; 1101 if (cfg->peer_pfx) 1102 ifa->peer_addr = *cfg->peer_pfx; 1103 1104 spin_lock_init(&ifa->lock); 1105 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1106 INIT_HLIST_NODE(&ifa->addr_lst); 1107 ifa->scope = cfg->scope; 1108 ifa->prefix_len = cfg->plen; 1109 ifa->rt_priority = cfg->rt_priority; 1110 ifa->flags = cfg->ifa_flags; 1111 /* No need to add the TENTATIVE flag for addresses with NODAD */ 1112 if (!(cfg->ifa_flags & IFA_F_NODAD)) 1113 ifa->flags |= IFA_F_TENTATIVE; 1114 ifa->valid_lft = cfg->valid_lft; 1115 ifa->prefered_lft = cfg->preferred_lft; 1116 ifa->cstamp = ifa->tstamp = jiffies; 1117 ifa->tokenized = false; 1118 1119 ifa->rt = f6i; 1120 1121 ifa->idev = idev; 1122 in6_dev_hold(idev); 1123 1124 /* For caller */ 1125 refcount_set(&ifa->refcnt, 1); 1126 1127 rcu_read_lock_bh(); 1128 1129 err = ipv6_add_addr_hash(idev->dev, ifa); 1130 if (err < 0) { 1131 rcu_read_unlock_bh(); 1132 goto out; 1133 } 1134 1135 write_lock(&idev->lock); 1136 1137 /* Add to inet6_dev unicast addr list. */ 1138 ipv6_link_dev_addr(idev, ifa); 1139 1140 if (ifa->flags&IFA_F_TEMPORARY) { 1141 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1142 in6_ifa_hold(ifa); 1143 } 1144 1145 in6_ifa_hold(ifa); 1146 write_unlock(&idev->lock); 1147 1148 rcu_read_unlock_bh(); 1149 1150 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1151 out: 1152 if (unlikely(err < 0)) { 1153 fib6_info_release(f6i); 1154 1155 if (ifa) { 1156 if (ifa->idev) 1157 in6_dev_put(ifa->idev); 1158 kfree(ifa); 1159 } 1160 ifa = ERR_PTR(err); 1161 } 1162 1163 return ifa; 1164 } 1165 1166 enum cleanup_prefix_rt_t { 1167 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1168 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1169 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1170 }; 1171 1172 /* 1173 * Check, whether the prefix for ifp would still need a prefix route 1174 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1175 * constants. 1176 * 1177 * 1) we don't purge prefix if address was not permanent. 1178 * prefix is managed by its own lifetime. 1179 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1180 * 3) if there are no addresses, delete prefix. 1181 * 4) if there are still other permanent address(es), 1182 * corresponding prefix is still permanent. 1183 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1184 * don't purge the prefix, assume user space is managing it. 1185 * 6) otherwise, update prefix lifetime to the 1186 * longest valid lifetime among the corresponding 1187 * addresses on the device. 1188 * Note: subsequent RA will update lifetime. 1189 **/ 1190 static enum cleanup_prefix_rt_t 1191 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1192 { 1193 struct inet6_ifaddr *ifa; 1194 struct inet6_dev *idev = ifp->idev; 1195 unsigned long lifetime; 1196 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1197 1198 *expires = jiffies; 1199 1200 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1201 if (ifa == ifp) 1202 continue; 1203 if (ifa->prefix_len != ifp->prefix_len || 1204 !ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1205 ifp->prefix_len)) 1206 continue; 1207 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1208 return CLEANUP_PREFIX_RT_NOP; 1209 1210 action = CLEANUP_PREFIX_RT_EXPIRE; 1211 1212 spin_lock(&ifa->lock); 1213 1214 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1215 /* 1216 * Note: Because this address is 1217 * not permanent, lifetime < 1218 * LONG_MAX / HZ here. 1219 */ 1220 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1221 *expires = ifa->tstamp + lifetime * HZ; 1222 spin_unlock(&ifa->lock); 1223 } 1224 1225 return action; 1226 } 1227 1228 static void 1229 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, 1230 bool del_rt, bool del_peer) 1231 { 1232 struct fib6_info *f6i; 1233 1234 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr, 1235 ifp->prefix_len, 1236 ifp->idev->dev, 0, RTF_DEFAULT, true); 1237 if (f6i) { 1238 if (del_rt) 1239 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 1240 else { 1241 if (!(f6i->fib6_flags & RTF_EXPIRES)) 1242 fib6_set_expires(f6i, expires); 1243 fib6_info_release(f6i); 1244 } 1245 } 1246 } 1247 1248 1249 /* This function wants to get referenced ifp and releases it before return */ 1250 1251 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1252 { 1253 int state; 1254 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1255 unsigned long expires; 1256 1257 ASSERT_RTNL(); 1258 1259 spin_lock_bh(&ifp->lock); 1260 state = ifp->state; 1261 ifp->state = INET6_IFADDR_STATE_DEAD; 1262 spin_unlock_bh(&ifp->lock); 1263 1264 if (state == INET6_IFADDR_STATE_DEAD) 1265 goto out; 1266 1267 spin_lock_bh(&addrconf_hash_lock); 1268 hlist_del_init_rcu(&ifp->addr_lst); 1269 spin_unlock_bh(&addrconf_hash_lock); 1270 1271 write_lock_bh(&ifp->idev->lock); 1272 1273 if (ifp->flags&IFA_F_TEMPORARY) { 1274 list_del(&ifp->tmp_list); 1275 if (ifp->ifpub) { 1276 in6_ifa_put(ifp->ifpub); 1277 ifp->ifpub = NULL; 1278 } 1279 __in6_ifa_put(ifp); 1280 } 1281 1282 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1283 action = check_cleanup_prefix_route(ifp, &expires); 1284 1285 list_del_rcu(&ifp->if_list); 1286 __in6_ifa_put(ifp); 1287 1288 write_unlock_bh(&ifp->idev->lock); 1289 1290 addrconf_del_dad_work(ifp); 1291 1292 ipv6_ifa_notify(RTM_DELADDR, ifp); 1293 1294 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1295 1296 if (action != CLEANUP_PREFIX_RT_NOP) { 1297 cleanup_prefix_route(ifp, expires, 1298 action == CLEANUP_PREFIX_RT_DEL, false); 1299 } 1300 1301 /* clean up prefsrc entries */ 1302 rt6_remove_prefsrc(ifp); 1303 out: 1304 in6_ifa_put(ifp); 1305 } 1306 1307 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block) 1308 { 1309 struct inet6_dev *idev = ifp->idev; 1310 unsigned long tmp_tstamp, age; 1311 unsigned long regen_advance; 1312 unsigned long now = jiffies; 1313 s32 cnf_temp_preferred_lft; 1314 struct inet6_ifaddr *ift; 1315 struct ifa6_config cfg; 1316 long max_desync_factor; 1317 struct in6_addr addr; 1318 int ret = 0; 1319 1320 write_lock_bh(&idev->lock); 1321 1322 retry: 1323 in6_dev_hold(idev); 1324 if (idev->cnf.use_tempaddr <= 0) { 1325 write_unlock_bh(&idev->lock); 1326 pr_info("%s: use_tempaddr is disabled\n", __func__); 1327 in6_dev_put(idev); 1328 ret = -1; 1329 goto out; 1330 } 1331 spin_lock_bh(&ifp->lock); 1332 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1333 idev->cnf.use_tempaddr = -1; /*XXX*/ 1334 spin_unlock_bh(&ifp->lock); 1335 write_unlock_bh(&idev->lock); 1336 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1337 __func__); 1338 in6_dev_put(idev); 1339 ret = -1; 1340 goto out; 1341 } 1342 in6_ifa_hold(ifp); 1343 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1344 ipv6_gen_rnd_iid(&addr); 1345 1346 age = (now - ifp->tstamp) / HZ; 1347 1348 regen_advance = idev->cnf.regen_max_retry * 1349 idev->cnf.dad_transmits * 1350 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 1351 1352 /* recalculate max_desync_factor each time and update 1353 * idev->desync_factor if it's larger 1354 */ 1355 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1356 max_desync_factor = min_t(__u32, 1357 idev->cnf.max_desync_factor, 1358 cnf_temp_preferred_lft - regen_advance); 1359 1360 if (unlikely(idev->desync_factor > max_desync_factor)) { 1361 if (max_desync_factor > 0) { 1362 get_random_bytes(&idev->desync_factor, 1363 sizeof(idev->desync_factor)); 1364 idev->desync_factor %= max_desync_factor; 1365 } else { 1366 idev->desync_factor = 0; 1367 } 1368 } 1369 1370 memset(&cfg, 0, sizeof(cfg)); 1371 cfg.valid_lft = min_t(__u32, ifp->valid_lft, 1372 idev->cnf.temp_valid_lft + age); 1373 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor; 1374 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft); 1375 1376 cfg.plen = ifp->prefix_len; 1377 tmp_tstamp = ifp->tstamp; 1378 spin_unlock_bh(&ifp->lock); 1379 1380 write_unlock_bh(&idev->lock); 1381 1382 /* A temporary address is created only if this calculated Preferred 1383 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1384 * an implementation must not create a temporary address with a zero 1385 * Preferred Lifetime. 1386 * Use age calculation as in addrconf_verify to avoid unnecessary 1387 * temporary addresses being generated. 1388 */ 1389 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1390 if (cfg.preferred_lft <= regen_advance + age) { 1391 in6_ifa_put(ifp); 1392 in6_dev_put(idev); 1393 ret = -1; 1394 goto out; 1395 } 1396 1397 cfg.ifa_flags = IFA_F_TEMPORARY; 1398 /* set in addrconf_prefix_rcv() */ 1399 if (ifp->flags & IFA_F_OPTIMISTIC) 1400 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 1401 1402 cfg.pfx = &addr; 1403 cfg.scope = ipv6_addr_scope(cfg.pfx); 1404 1405 ift = ipv6_add_addr(idev, &cfg, block, NULL); 1406 if (IS_ERR(ift)) { 1407 in6_ifa_put(ifp); 1408 in6_dev_put(idev); 1409 pr_info("%s: retry temporary address regeneration\n", __func__); 1410 write_lock_bh(&idev->lock); 1411 goto retry; 1412 } 1413 1414 spin_lock_bh(&ift->lock); 1415 ift->ifpub = ifp; 1416 ift->cstamp = now; 1417 ift->tstamp = tmp_tstamp; 1418 spin_unlock_bh(&ift->lock); 1419 1420 addrconf_dad_start(ift); 1421 in6_ifa_put(ift); 1422 in6_dev_put(idev); 1423 out: 1424 return ret; 1425 } 1426 1427 /* 1428 * Choose an appropriate source address (RFC3484) 1429 */ 1430 enum { 1431 IPV6_SADDR_RULE_INIT = 0, 1432 IPV6_SADDR_RULE_LOCAL, 1433 IPV6_SADDR_RULE_SCOPE, 1434 IPV6_SADDR_RULE_PREFERRED, 1435 #ifdef CONFIG_IPV6_MIP6 1436 IPV6_SADDR_RULE_HOA, 1437 #endif 1438 IPV6_SADDR_RULE_OIF, 1439 IPV6_SADDR_RULE_LABEL, 1440 IPV6_SADDR_RULE_PRIVACY, 1441 IPV6_SADDR_RULE_ORCHID, 1442 IPV6_SADDR_RULE_PREFIX, 1443 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1444 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1445 #endif 1446 IPV6_SADDR_RULE_MAX 1447 }; 1448 1449 struct ipv6_saddr_score { 1450 int rule; 1451 int addr_type; 1452 struct inet6_ifaddr *ifa; 1453 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1454 int scopedist; 1455 int matchlen; 1456 }; 1457 1458 struct ipv6_saddr_dst { 1459 const struct in6_addr *addr; 1460 int ifindex; 1461 int scope; 1462 int label; 1463 unsigned int prefs; 1464 }; 1465 1466 static inline int ipv6_saddr_preferred(int type) 1467 { 1468 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1469 return 1; 1470 return 0; 1471 } 1472 1473 static bool ipv6_use_optimistic_addr(struct net *net, 1474 struct inet6_dev *idev) 1475 { 1476 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1477 if (!idev) 1478 return false; 1479 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1480 return false; 1481 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic) 1482 return false; 1483 1484 return true; 1485 #else 1486 return false; 1487 #endif 1488 } 1489 1490 static bool ipv6_allow_optimistic_dad(struct net *net, 1491 struct inet6_dev *idev) 1492 { 1493 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1494 if (!idev) 1495 return false; 1496 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1497 return false; 1498 1499 return true; 1500 #else 1501 return false; 1502 #endif 1503 } 1504 1505 static int ipv6_get_saddr_eval(struct net *net, 1506 struct ipv6_saddr_score *score, 1507 struct ipv6_saddr_dst *dst, 1508 int i) 1509 { 1510 int ret; 1511 1512 if (i <= score->rule) { 1513 switch (i) { 1514 case IPV6_SADDR_RULE_SCOPE: 1515 ret = score->scopedist; 1516 break; 1517 case IPV6_SADDR_RULE_PREFIX: 1518 ret = score->matchlen; 1519 break; 1520 default: 1521 ret = !!test_bit(i, score->scorebits); 1522 } 1523 goto out; 1524 } 1525 1526 switch (i) { 1527 case IPV6_SADDR_RULE_INIT: 1528 /* Rule 0: remember if hiscore is not ready yet */ 1529 ret = !!score->ifa; 1530 break; 1531 case IPV6_SADDR_RULE_LOCAL: 1532 /* Rule 1: Prefer same address */ 1533 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1534 break; 1535 case IPV6_SADDR_RULE_SCOPE: 1536 /* Rule 2: Prefer appropriate scope 1537 * 1538 * ret 1539 * ^ 1540 * -1 | d 15 1541 * ---+--+-+---> scope 1542 * | 1543 * | d is scope of the destination. 1544 * B-d | \ 1545 * | \ <- smaller scope is better if 1546 * B-15 | \ if scope is enough for destination. 1547 * | ret = B - scope (-1 <= scope >= d <= 15). 1548 * d-C-1 | / 1549 * |/ <- greater is better 1550 * -C / if scope is not enough for destination. 1551 * /| ret = scope - C (-1 <= d < scope <= 15). 1552 * 1553 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1554 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1555 * Assume B = 0 and we get C > 29. 1556 */ 1557 ret = __ipv6_addr_src_scope(score->addr_type); 1558 if (ret >= dst->scope) 1559 ret = -ret; 1560 else 1561 ret -= 128; /* 30 is enough */ 1562 score->scopedist = ret; 1563 break; 1564 case IPV6_SADDR_RULE_PREFERRED: 1565 { 1566 /* Rule 3: Avoid deprecated and optimistic addresses */ 1567 u8 avoid = IFA_F_DEPRECATED; 1568 1569 if (!ipv6_use_optimistic_addr(net, score->ifa->idev)) 1570 avoid |= IFA_F_OPTIMISTIC; 1571 ret = ipv6_saddr_preferred(score->addr_type) || 1572 !(score->ifa->flags & avoid); 1573 break; 1574 } 1575 #ifdef CONFIG_IPV6_MIP6 1576 case IPV6_SADDR_RULE_HOA: 1577 { 1578 /* Rule 4: Prefer home address */ 1579 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1580 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1581 break; 1582 } 1583 #endif 1584 case IPV6_SADDR_RULE_OIF: 1585 /* Rule 5: Prefer outgoing interface */ 1586 ret = (!dst->ifindex || 1587 dst->ifindex == score->ifa->idev->dev->ifindex); 1588 break; 1589 case IPV6_SADDR_RULE_LABEL: 1590 /* Rule 6: Prefer matching label */ 1591 ret = ipv6_addr_label(net, 1592 &score->ifa->addr, score->addr_type, 1593 score->ifa->idev->dev->ifindex) == dst->label; 1594 break; 1595 case IPV6_SADDR_RULE_PRIVACY: 1596 { 1597 /* Rule 7: Prefer public address 1598 * Note: prefer temporary address if use_tempaddr >= 2 1599 */ 1600 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1601 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1602 score->ifa->idev->cnf.use_tempaddr >= 2; 1603 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1604 break; 1605 } 1606 case IPV6_SADDR_RULE_ORCHID: 1607 /* Rule 8-: Prefer ORCHID vs ORCHID or 1608 * non-ORCHID vs non-ORCHID 1609 */ 1610 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1611 ipv6_addr_orchid(dst->addr)); 1612 break; 1613 case IPV6_SADDR_RULE_PREFIX: 1614 /* Rule 8: Use longest matching prefix */ 1615 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1616 if (ret > score->ifa->prefix_len) 1617 ret = score->ifa->prefix_len; 1618 score->matchlen = ret; 1619 break; 1620 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1621 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1622 /* Optimistic addresses still have lower precedence than other 1623 * preferred addresses. 1624 */ 1625 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1626 break; 1627 #endif 1628 default: 1629 ret = 0; 1630 } 1631 1632 if (ret) 1633 __set_bit(i, score->scorebits); 1634 score->rule = i; 1635 out: 1636 return ret; 1637 } 1638 1639 static int __ipv6_dev_get_saddr(struct net *net, 1640 struct ipv6_saddr_dst *dst, 1641 struct inet6_dev *idev, 1642 struct ipv6_saddr_score *scores, 1643 int hiscore_idx) 1644 { 1645 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1646 1647 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) { 1648 int i; 1649 1650 /* 1651 * - Tentative Address (RFC2462 section 5.4) 1652 * - A tentative address is not considered 1653 * "assigned to an interface" in the traditional 1654 * sense, unless it is also flagged as optimistic. 1655 * - Candidate Source Address (section 4) 1656 * - In any case, anycast addresses, multicast 1657 * addresses, and the unspecified address MUST 1658 * NOT be included in a candidate set. 1659 */ 1660 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1661 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1662 continue; 1663 1664 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1665 1666 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1667 score->addr_type & IPV6_ADDR_MULTICAST)) { 1668 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1669 idev->dev->name); 1670 continue; 1671 } 1672 1673 score->rule = -1; 1674 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1675 1676 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1677 int minihiscore, miniscore; 1678 1679 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1680 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1681 1682 if (minihiscore > miniscore) { 1683 if (i == IPV6_SADDR_RULE_SCOPE && 1684 score->scopedist > 0) { 1685 /* 1686 * special case: 1687 * each remaining entry 1688 * has too small (not enough) 1689 * scope, because ifa entries 1690 * are sorted by their scope 1691 * values. 1692 */ 1693 goto out; 1694 } 1695 break; 1696 } else if (minihiscore < miniscore) { 1697 swap(hiscore, score); 1698 hiscore_idx = 1 - hiscore_idx; 1699 1700 /* restore our iterator */ 1701 score->ifa = hiscore->ifa; 1702 1703 break; 1704 } 1705 } 1706 } 1707 out: 1708 return hiscore_idx; 1709 } 1710 1711 static int ipv6_get_saddr_master(struct net *net, 1712 const struct net_device *dst_dev, 1713 const struct net_device *master, 1714 struct ipv6_saddr_dst *dst, 1715 struct ipv6_saddr_score *scores, 1716 int hiscore_idx) 1717 { 1718 struct inet6_dev *idev; 1719 1720 idev = __in6_dev_get(dst_dev); 1721 if (idev) 1722 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1723 scores, hiscore_idx); 1724 1725 idev = __in6_dev_get(master); 1726 if (idev) 1727 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1728 scores, hiscore_idx); 1729 1730 return hiscore_idx; 1731 } 1732 1733 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1734 const struct in6_addr *daddr, unsigned int prefs, 1735 struct in6_addr *saddr) 1736 { 1737 struct ipv6_saddr_score scores[2], *hiscore; 1738 struct ipv6_saddr_dst dst; 1739 struct inet6_dev *idev; 1740 struct net_device *dev; 1741 int dst_type; 1742 bool use_oif_addr = false; 1743 int hiscore_idx = 0; 1744 int ret = 0; 1745 1746 dst_type = __ipv6_addr_type(daddr); 1747 dst.addr = daddr; 1748 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1749 dst.scope = __ipv6_addr_src_scope(dst_type); 1750 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1751 dst.prefs = prefs; 1752 1753 scores[hiscore_idx].rule = -1; 1754 scores[hiscore_idx].ifa = NULL; 1755 1756 rcu_read_lock(); 1757 1758 /* Candidate Source Address (section 4) 1759 * - multicast and link-local destination address, 1760 * the set of candidate source address MUST only 1761 * include addresses assigned to interfaces 1762 * belonging to the same link as the outgoing 1763 * interface. 1764 * (- For site-local destination addresses, the 1765 * set of candidate source addresses MUST only 1766 * include addresses assigned to interfaces 1767 * belonging to the same site as the outgoing 1768 * interface.) 1769 * - "It is RECOMMENDED that the candidate source addresses 1770 * be the set of unicast addresses assigned to the 1771 * interface that will be used to send to the destination 1772 * (the 'outgoing' interface)." (RFC 6724) 1773 */ 1774 if (dst_dev) { 1775 idev = __in6_dev_get(dst_dev); 1776 if ((dst_type & IPV6_ADDR_MULTICAST) || 1777 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1778 (idev && idev->cnf.use_oif_addrs_only)) { 1779 use_oif_addr = true; 1780 } 1781 } 1782 1783 if (use_oif_addr) { 1784 if (idev) 1785 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1786 } else { 1787 const struct net_device *master; 1788 int master_idx = 0; 1789 1790 /* if dst_dev exists and is enslaved to an L3 device, then 1791 * prefer addresses from dst_dev and then the master over 1792 * any other enslaved devices in the L3 domain. 1793 */ 1794 master = l3mdev_master_dev_rcu(dst_dev); 1795 if (master) { 1796 master_idx = master->ifindex; 1797 1798 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1799 master, &dst, 1800 scores, hiscore_idx); 1801 1802 if (scores[hiscore_idx].ifa) 1803 goto out; 1804 } 1805 1806 for_each_netdev_rcu(net, dev) { 1807 /* only consider addresses on devices in the 1808 * same L3 domain 1809 */ 1810 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1811 continue; 1812 idev = __in6_dev_get(dev); 1813 if (!idev) 1814 continue; 1815 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1816 } 1817 } 1818 1819 out: 1820 hiscore = &scores[hiscore_idx]; 1821 if (!hiscore->ifa) 1822 ret = -EADDRNOTAVAIL; 1823 else 1824 *saddr = hiscore->ifa->addr; 1825 1826 rcu_read_unlock(); 1827 return ret; 1828 } 1829 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1830 1831 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1832 u32 banned_flags) 1833 { 1834 struct inet6_ifaddr *ifp; 1835 int err = -EADDRNOTAVAIL; 1836 1837 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1838 if (ifp->scope > IFA_LINK) 1839 break; 1840 if (ifp->scope == IFA_LINK && 1841 !(ifp->flags & banned_flags)) { 1842 *addr = ifp->addr; 1843 err = 0; 1844 break; 1845 } 1846 } 1847 return err; 1848 } 1849 1850 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1851 u32 banned_flags) 1852 { 1853 struct inet6_dev *idev; 1854 int err = -EADDRNOTAVAIL; 1855 1856 rcu_read_lock(); 1857 idev = __in6_dev_get(dev); 1858 if (idev) { 1859 read_lock_bh(&idev->lock); 1860 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1861 read_unlock_bh(&idev->lock); 1862 } 1863 rcu_read_unlock(); 1864 return err; 1865 } 1866 1867 static int ipv6_count_addresses(const struct inet6_dev *idev) 1868 { 1869 const struct inet6_ifaddr *ifp; 1870 int cnt = 0; 1871 1872 rcu_read_lock(); 1873 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list) 1874 cnt++; 1875 rcu_read_unlock(); 1876 return cnt; 1877 } 1878 1879 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1880 const struct net_device *dev, int strict) 1881 { 1882 return ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1883 strict, IFA_F_TENTATIVE); 1884 } 1885 EXPORT_SYMBOL(ipv6_chk_addr); 1886 1887 /* device argument is used to find the L3 domain of interest. If 1888 * skip_dev_check is set, then the ifp device is not checked against 1889 * the passed in dev argument. So the 2 cases for addresses checks are: 1890 * 1. does the address exist in the L3 domain that dev is part of 1891 * (skip_dev_check = true), or 1892 * 1893 * 2. does the address exist on the specific device 1894 * (skip_dev_check = false) 1895 */ 1896 static struct net_device * 1897 __ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1898 const struct net_device *dev, bool skip_dev_check, 1899 int strict, u32 banned_flags) 1900 { 1901 unsigned int hash = inet6_addr_hash(net, addr); 1902 struct net_device *l3mdev, *ndev; 1903 struct inet6_ifaddr *ifp; 1904 u32 ifp_flags; 1905 1906 rcu_read_lock(); 1907 1908 l3mdev = l3mdev_master_dev_rcu(dev); 1909 if (skip_dev_check) 1910 dev = NULL; 1911 1912 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1913 ndev = ifp->idev->dev; 1914 if (!net_eq(dev_net(ndev), net)) 1915 continue; 1916 1917 if (l3mdev_master_dev_rcu(ndev) != l3mdev) 1918 continue; 1919 1920 /* Decouple optimistic from tentative for evaluation here. 1921 * Ban optimistic addresses explicitly, when required. 1922 */ 1923 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1924 ? (ifp->flags&~IFA_F_TENTATIVE) 1925 : ifp->flags; 1926 if (ipv6_addr_equal(&ifp->addr, addr) && 1927 !(ifp_flags&banned_flags) && 1928 (!dev || ndev == dev || 1929 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1930 rcu_read_unlock(); 1931 return ndev; 1932 } 1933 } 1934 1935 rcu_read_unlock(); 1936 return NULL; 1937 } 1938 1939 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1940 const struct net_device *dev, bool skip_dev_check, 1941 int strict, u32 banned_flags) 1942 { 1943 return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check, 1944 strict, banned_flags) ? 1 : 0; 1945 } 1946 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1947 1948 1949 /* Compares an address/prefix_len with addresses on device @dev. 1950 * If one is found it returns true. 1951 */ 1952 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1953 const unsigned int prefix_len, struct net_device *dev) 1954 { 1955 const struct inet6_ifaddr *ifa; 1956 const struct inet6_dev *idev; 1957 bool ret = false; 1958 1959 rcu_read_lock(); 1960 idev = __in6_dev_get(dev); 1961 if (idev) { 1962 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1963 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1964 if (ret) 1965 break; 1966 } 1967 } 1968 rcu_read_unlock(); 1969 1970 return ret; 1971 } 1972 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1973 1974 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1975 { 1976 const struct inet6_ifaddr *ifa; 1977 const struct inet6_dev *idev; 1978 int onlink; 1979 1980 onlink = 0; 1981 rcu_read_lock(); 1982 idev = __in6_dev_get(dev); 1983 if (idev) { 1984 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1985 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1986 ifa->prefix_len); 1987 if (onlink) 1988 break; 1989 } 1990 } 1991 rcu_read_unlock(); 1992 return onlink; 1993 } 1994 EXPORT_SYMBOL(ipv6_chk_prefix); 1995 1996 /** 1997 * ipv6_dev_find - find the first device with a given source address. 1998 * @net: the net namespace 1999 * @addr: the source address 2000 * @dev: used to find the L3 domain of interest 2001 * 2002 * The caller should be protected by RCU, or RTNL. 2003 */ 2004 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr, 2005 struct net_device *dev) 2006 { 2007 return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1, 2008 IFA_F_TENTATIVE); 2009 } 2010 EXPORT_SYMBOL(ipv6_dev_find); 2011 2012 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 2013 struct net_device *dev, int strict) 2014 { 2015 unsigned int hash = inet6_addr_hash(net, addr); 2016 struct inet6_ifaddr *ifp, *result = NULL; 2017 2018 rcu_read_lock(); 2019 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 2020 if (!net_eq(dev_net(ifp->idev->dev), net)) 2021 continue; 2022 if (ipv6_addr_equal(&ifp->addr, addr)) { 2023 if (!dev || ifp->idev->dev == dev || 2024 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 2025 result = ifp; 2026 in6_ifa_hold(ifp); 2027 break; 2028 } 2029 } 2030 } 2031 rcu_read_unlock(); 2032 2033 return result; 2034 } 2035 2036 /* Gets referenced address, destroys ifaddr */ 2037 2038 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 2039 { 2040 if (dad_failed) 2041 ifp->flags |= IFA_F_DADFAILED; 2042 2043 if (ifp->flags&IFA_F_TEMPORARY) { 2044 struct inet6_ifaddr *ifpub; 2045 spin_lock_bh(&ifp->lock); 2046 ifpub = ifp->ifpub; 2047 if (ifpub) { 2048 in6_ifa_hold(ifpub); 2049 spin_unlock_bh(&ifp->lock); 2050 ipv6_create_tempaddr(ifpub, true); 2051 in6_ifa_put(ifpub); 2052 } else { 2053 spin_unlock_bh(&ifp->lock); 2054 } 2055 ipv6_del_addr(ifp); 2056 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) { 2057 spin_lock_bh(&ifp->lock); 2058 addrconf_del_dad_work(ifp); 2059 ifp->flags |= IFA_F_TENTATIVE; 2060 if (dad_failed) 2061 ifp->flags &= ~IFA_F_OPTIMISTIC; 2062 spin_unlock_bh(&ifp->lock); 2063 if (dad_failed) 2064 ipv6_ifa_notify(0, ifp); 2065 in6_ifa_put(ifp); 2066 } else { 2067 ipv6_del_addr(ifp); 2068 } 2069 } 2070 2071 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 2072 { 2073 int err = -ENOENT; 2074 2075 spin_lock_bh(&ifp->lock); 2076 if (ifp->state == INET6_IFADDR_STATE_DAD) { 2077 ifp->state = INET6_IFADDR_STATE_POSTDAD; 2078 err = 0; 2079 } 2080 spin_unlock_bh(&ifp->lock); 2081 2082 return err; 2083 } 2084 2085 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp) 2086 { 2087 struct inet6_dev *idev = ifp->idev; 2088 struct net *net = dev_net(ifp->idev->dev); 2089 2090 if (addrconf_dad_end(ifp)) { 2091 in6_ifa_put(ifp); 2092 return; 2093 } 2094 2095 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n", 2096 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source); 2097 2098 spin_lock_bh(&ifp->lock); 2099 2100 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 2101 struct in6_addr new_addr; 2102 struct inet6_ifaddr *ifp2; 2103 int retries = ifp->stable_privacy_retry + 1; 2104 struct ifa6_config cfg = { 2105 .pfx = &new_addr, 2106 .plen = ifp->prefix_len, 2107 .ifa_flags = ifp->flags, 2108 .valid_lft = ifp->valid_lft, 2109 .preferred_lft = ifp->prefered_lft, 2110 .scope = ifp->scope, 2111 }; 2112 2113 if (retries > net->ipv6.sysctl.idgen_retries) { 2114 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 2115 ifp->idev->dev->name); 2116 goto errdad; 2117 } 2118 2119 new_addr = ifp->addr; 2120 if (ipv6_generate_stable_address(&new_addr, retries, 2121 idev)) 2122 goto errdad; 2123 2124 spin_unlock_bh(&ifp->lock); 2125 2126 if (idev->cnf.max_addresses && 2127 ipv6_count_addresses(idev) >= 2128 idev->cnf.max_addresses) 2129 goto lock_errdad; 2130 2131 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 2132 ifp->idev->dev->name); 2133 2134 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL); 2135 if (IS_ERR(ifp2)) 2136 goto lock_errdad; 2137 2138 spin_lock_bh(&ifp2->lock); 2139 ifp2->stable_privacy_retry = retries; 2140 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2141 spin_unlock_bh(&ifp2->lock); 2142 2143 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2144 in6_ifa_put(ifp2); 2145 lock_errdad: 2146 spin_lock_bh(&ifp->lock); 2147 } 2148 2149 errdad: 2150 /* transition from _POSTDAD to _ERRDAD */ 2151 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2152 spin_unlock_bh(&ifp->lock); 2153 2154 addrconf_mod_dad_work(ifp, 0); 2155 in6_ifa_put(ifp); 2156 } 2157 2158 /* Join to solicited addr multicast group. 2159 * caller must hold RTNL */ 2160 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2161 { 2162 struct in6_addr maddr; 2163 2164 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2165 return; 2166 2167 addrconf_addr_solict_mult(addr, &maddr); 2168 ipv6_dev_mc_inc(dev, &maddr); 2169 } 2170 2171 /* caller must hold RTNL */ 2172 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2173 { 2174 struct in6_addr maddr; 2175 2176 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2177 return; 2178 2179 addrconf_addr_solict_mult(addr, &maddr); 2180 __ipv6_dev_mc_dec(idev, &maddr); 2181 } 2182 2183 /* caller must hold RTNL */ 2184 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2185 { 2186 struct in6_addr addr; 2187 2188 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2189 return; 2190 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2191 if (ipv6_addr_any(&addr)) 2192 return; 2193 __ipv6_dev_ac_inc(ifp->idev, &addr); 2194 } 2195 2196 /* caller must hold RTNL */ 2197 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2198 { 2199 struct in6_addr addr; 2200 2201 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2202 return; 2203 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2204 if (ipv6_addr_any(&addr)) 2205 return; 2206 __ipv6_dev_ac_dec(ifp->idev, &addr); 2207 } 2208 2209 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2210 { 2211 switch (dev->addr_len) { 2212 case ETH_ALEN: 2213 memcpy(eui, dev->dev_addr, 3); 2214 eui[3] = 0xFF; 2215 eui[4] = 0xFE; 2216 memcpy(eui + 5, dev->dev_addr + 3, 3); 2217 break; 2218 case EUI64_ADDR_LEN: 2219 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2220 eui[0] ^= 2; 2221 break; 2222 default: 2223 return -1; 2224 } 2225 2226 return 0; 2227 } 2228 2229 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2230 { 2231 union fwnet_hwaddr *ha; 2232 2233 if (dev->addr_len != FWNET_ALEN) 2234 return -1; 2235 2236 ha = (union fwnet_hwaddr *)dev->dev_addr; 2237 2238 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2239 eui[0] ^= 2; 2240 return 0; 2241 } 2242 2243 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2244 { 2245 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2246 if (dev->addr_len != ARCNET_ALEN) 2247 return -1; 2248 memset(eui, 0, 7); 2249 eui[7] = *(u8 *)dev->dev_addr; 2250 return 0; 2251 } 2252 2253 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2254 { 2255 if (dev->addr_len != INFINIBAND_ALEN) 2256 return -1; 2257 memcpy(eui, dev->dev_addr + 12, 8); 2258 eui[0] |= 2; 2259 return 0; 2260 } 2261 2262 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2263 { 2264 if (addr == 0) 2265 return -1; 2266 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2267 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2268 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2269 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2270 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2271 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2272 eui[1] = 0; 2273 eui[2] = 0x5E; 2274 eui[3] = 0xFE; 2275 memcpy(eui + 4, &addr, 4); 2276 return 0; 2277 } 2278 2279 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2280 { 2281 if (dev->priv_flags & IFF_ISATAP) 2282 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2283 return -1; 2284 } 2285 2286 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2287 { 2288 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2289 } 2290 2291 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2292 { 2293 memcpy(eui, dev->perm_addr, 3); 2294 memcpy(eui + 5, dev->perm_addr + 3, 3); 2295 eui[3] = 0xFF; 2296 eui[4] = 0xFE; 2297 eui[0] ^= 2; 2298 return 0; 2299 } 2300 2301 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2302 { 2303 switch (dev->type) { 2304 case ARPHRD_ETHER: 2305 case ARPHRD_FDDI: 2306 return addrconf_ifid_eui48(eui, dev); 2307 case ARPHRD_ARCNET: 2308 return addrconf_ifid_arcnet(eui, dev); 2309 case ARPHRD_INFINIBAND: 2310 return addrconf_ifid_infiniband(eui, dev); 2311 case ARPHRD_SIT: 2312 return addrconf_ifid_sit(eui, dev); 2313 case ARPHRD_IPGRE: 2314 case ARPHRD_TUNNEL: 2315 return addrconf_ifid_gre(eui, dev); 2316 case ARPHRD_6LOWPAN: 2317 return addrconf_ifid_6lowpan(eui, dev); 2318 case ARPHRD_IEEE1394: 2319 return addrconf_ifid_ieee1394(eui, dev); 2320 case ARPHRD_TUNNEL6: 2321 case ARPHRD_IP6GRE: 2322 case ARPHRD_RAWIP: 2323 return addrconf_ifid_ip6tnl(eui, dev); 2324 } 2325 return -1; 2326 } 2327 2328 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2329 { 2330 int err = -1; 2331 struct inet6_ifaddr *ifp; 2332 2333 read_lock_bh(&idev->lock); 2334 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2335 if (ifp->scope > IFA_LINK) 2336 break; 2337 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2338 memcpy(eui, ifp->addr.s6_addr+8, 8); 2339 err = 0; 2340 break; 2341 } 2342 } 2343 read_unlock_bh(&idev->lock); 2344 return err; 2345 } 2346 2347 /* Generation of a randomized Interface Identifier 2348 * draft-ietf-6man-rfc4941bis, Section 3.3.1 2349 */ 2350 2351 static void ipv6_gen_rnd_iid(struct in6_addr *addr) 2352 { 2353 regen: 2354 get_random_bytes(&addr->s6_addr[8], 8); 2355 2356 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1: 2357 * check if generated address is not inappropriate: 2358 * 2359 * - Reserved IPv6 Interface Identifers 2360 * - XXX: already assigned to an address on the device 2361 */ 2362 2363 /* Subnet-router anycast: 0000:0000:0000:0000 */ 2364 if (!(addr->s6_addr32[2] | addr->s6_addr32[3])) 2365 goto regen; 2366 2367 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212 2368 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213 2369 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF 2370 */ 2371 if (ntohl(addr->s6_addr32[2]) == 0x02005eff && 2372 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000) 2373 goto regen; 2374 2375 /* Reserved subnet anycast addresses */ 2376 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff && 2377 ntohl(addr->s6_addr32[3]) >= 0Xffffff80) 2378 goto regen; 2379 } 2380 2381 /* 2382 * Add prefix route. 2383 */ 2384 2385 static void 2386 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric, 2387 struct net_device *dev, unsigned long expires, 2388 u32 flags, gfp_t gfp_flags) 2389 { 2390 struct fib6_config cfg = { 2391 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2392 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF, 2393 .fc_ifindex = dev->ifindex, 2394 .fc_expires = expires, 2395 .fc_dst_len = plen, 2396 .fc_flags = RTF_UP | flags, 2397 .fc_nlinfo.nl_net = dev_net(dev), 2398 .fc_protocol = RTPROT_KERNEL, 2399 .fc_type = RTN_UNICAST, 2400 }; 2401 2402 cfg.fc_dst = *pfx; 2403 2404 /* Prevent useless cloning on PtP SIT. 2405 This thing is done here expecting that the whole 2406 class of non-broadcast devices need not cloning. 2407 */ 2408 #if IS_ENABLED(CONFIG_IPV6_SIT) 2409 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2410 cfg.fc_flags |= RTF_NONEXTHOP; 2411 #endif 2412 2413 ip6_route_add(&cfg, gfp_flags, NULL); 2414 } 2415 2416 2417 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2418 int plen, 2419 const struct net_device *dev, 2420 u32 flags, u32 noflags, 2421 bool no_gw) 2422 { 2423 struct fib6_node *fn; 2424 struct fib6_info *rt = NULL; 2425 struct fib6_table *table; 2426 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2427 2428 table = fib6_get_table(dev_net(dev), tb_id); 2429 if (!table) 2430 return NULL; 2431 2432 rcu_read_lock(); 2433 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true); 2434 if (!fn) 2435 goto out; 2436 2437 for_each_fib6_node_rt_rcu(fn) { 2438 /* prefix routes only use builtin fib6_nh */ 2439 if (rt->nh) 2440 continue; 2441 2442 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex) 2443 continue; 2444 if (no_gw && rt->fib6_nh->fib_nh_gw_family) 2445 continue; 2446 if ((rt->fib6_flags & flags) != flags) 2447 continue; 2448 if ((rt->fib6_flags & noflags) != 0) 2449 continue; 2450 if (!fib6_info_hold_safe(rt)) 2451 continue; 2452 break; 2453 } 2454 out: 2455 rcu_read_unlock(); 2456 return rt; 2457 } 2458 2459 2460 /* Create "default" multicast route to the interface */ 2461 2462 static void addrconf_add_mroute(struct net_device *dev) 2463 { 2464 struct fib6_config cfg = { 2465 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2466 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2467 .fc_ifindex = dev->ifindex, 2468 .fc_dst_len = 8, 2469 .fc_flags = RTF_UP, 2470 .fc_type = RTN_UNICAST, 2471 .fc_nlinfo.nl_net = dev_net(dev), 2472 }; 2473 2474 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2475 2476 ip6_route_add(&cfg, GFP_KERNEL, NULL); 2477 } 2478 2479 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2480 { 2481 struct inet6_dev *idev; 2482 2483 ASSERT_RTNL(); 2484 2485 idev = ipv6_find_idev(dev); 2486 if (IS_ERR(idev)) 2487 return idev; 2488 2489 if (idev->cnf.disable_ipv6) 2490 return ERR_PTR(-EACCES); 2491 2492 /* Add default multicast route */ 2493 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2494 addrconf_add_mroute(dev); 2495 2496 return idev; 2497 } 2498 2499 static void manage_tempaddrs(struct inet6_dev *idev, 2500 struct inet6_ifaddr *ifp, 2501 __u32 valid_lft, __u32 prefered_lft, 2502 bool create, unsigned long now) 2503 { 2504 u32 flags; 2505 struct inet6_ifaddr *ift; 2506 2507 read_lock_bh(&idev->lock); 2508 /* update all temporary addresses in the list */ 2509 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2510 int age, max_valid, max_prefered; 2511 2512 if (ifp != ift->ifpub) 2513 continue; 2514 2515 /* RFC 4941 section 3.3: 2516 * If a received option will extend the lifetime of a public 2517 * address, the lifetimes of temporary addresses should 2518 * be extended, subject to the overall constraint that no 2519 * temporary addresses should ever remain "valid" or "preferred" 2520 * for a time longer than (TEMP_VALID_LIFETIME) or 2521 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2522 */ 2523 age = (now - ift->cstamp) / HZ; 2524 max_valid = idev->cnf.temp_valid_lft - age; 2525 if (max_valid < 0) 2526 max_valid = 0; 2527 2528 max_prefered = idev->cnf.temp_prefered_lft - 2529 idev->desync_factor - age; 2530 if (max_prefered < 0) 2531 max_prefered = 0; 2532 2533 if (valid_lft > max_valid) 2534 valid_lft = max_valid; 2535 2536 if (prefered_lft > max_prefered) 2537 prefered_lft = max_prefered; 2538 2539 spin_lock(&ift->lock); 2540 flags = ift->flags; 2541 ift->valid_lft = valid_lft; 2542 ift->prefered_lft = prefered_lft; 2543 ift->tstamp = now; 2544 if (prefered_lft > 0) 2545 ift->flags &= ~IFA_F_DEPRECATED; 2546 2547 spin_unlock(&ift->lock); 2548 if (!(flags&IFA_F_TENTATIVE)) 2549 ipv6_ifa_notify(0, ift); 2550 } 2551 2552 if ((create || list_empty(&idev->tempaddr_list)) && 2553 idev->cnf.use_tempaddr > 0) { 2554 /* When a new public address is created as described 2555 * in [ADDRCONF], also create a new temporary address. 2556 * Also create a temporary address if it's enabled but 2557 * no temporary address currently exists. 2558 */ 2559 read_unlock_bh(&idev->lock); 2560 ipv6_create_tempaddr(ifp, false); 2561 } else { 2562 read_unlock_bh(&idev->lock); 2563 } 2564 } 2565 2566 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2567 { 2568 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2569 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2570 } 2571 2572 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2573 const struct prefix_info *pinfo, 2574 struct inet6_dev *in6_dev, 2575 const struct in6_addr *addr, int addr_type, 2576 u32 addr_flags, bool sllao, bool tokenized, 2577 __u32 valid_lft, u32 prefered_lft) 2578 { 2579 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2580 int create = 0; 2581 2582 if (!ifp && valid_lft) { 2583 int max_addresses = in6_dev->cnf.max_addresses; 2584 struct ifa6_config cfg = { 2585 .pfx = addr, 2586 .plen = pinfo->prefix_len, 2587 .ifa_flags = addr_flags, 2588 .valid_lft = valid_lft, 2589 .preferred_lft = prefered_lft, 2590 .scope = addr_type & IPV6_ADDR_SCOPE_MASK, 2591 }; 2592 2593 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2594 if ((net->ipv6.devconf_all->optimistic_dad || 2595 in6_dev->cnf.optimistic_dad) && 2596 !net->ipv6.devconf_all->forwarding && sllao) 2597 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 2598 #endif 2599 2600 /* Do not allow to create too much of autoconfigured 2601 * addresses; this would be too easy way to crash kernel. 2602 */ 2603 if (!max_addresses || 2604 ipv6_count_addresses(in6_dev) < max_addresses) 2605 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL); 2606 2607 if (IS_ERR_OR_NULL(ifp)) 2608 return -1; 2609 2610 create = 1; 2611 spin_lock_bh(&ifp->lock); 2612 ifp->flags |= IFA_F_MANAGETEMPADDR; 2613 ifp->cstamp = jiffies; 2614 ifp->tokenized = tokenized; 2615 spin_unlock_bh(&ifp->lock); 2616 addrconf_dad_start(ifp); 2617 } 2618 2619 if (ifp) { 2620 u32 flags; 2621 unsigned long now; 2622 u32 stored_lft; 2623 2624 /* Update lifetime (RFC4862 5.5.3 e) 2625 * We deviate from RFC4862 by honoring all Valid Lifetimes to 2626 * improve the reaction of SLAAC to renumbering events 2627 * (draft-gont-6man-slaac-renum-06, Section 4.2) 2628 */ 2629 spin_lock_bh(&ifp->lock); 2630 now = jiffies; 2631 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2632 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2633 else 2634 stored_lft = 0; 2635 2636 if (!create && stored_lft) { 2637 ifp->valid_lft = valid_lft; 2638 ifp->prefered_lft = prefered_lft; 2639 ifp->tstamp = now; 2640 flags = ifp->flags; 2641 ifp->flags &= ~IFA_F_DEPRECATED; 2642 spin_unlock_bh(&ifp->lock); 2643 2644 if (!(flags&IFA_F_TENTATIVE)) 2645 ipv6_ifa_notify(0, ifp); 2646 } else 2647 spin_unlock_bh(&ifp->lock); 2648 2649 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2650 create, now); 2651 2652 in6_ifa_put(ifp); 2653 addrconf_verify(); 2654 } 2655 2656 return 0; 2657 } 2658 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2659 2660 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2661 { 2662 struct prefix_info *pinfo; 2663 __u32 valid_lft; 2664 __u32 prefered_lft; 2665 int addr_type, err; 2666 u32 addr_flags = 0; 2667 struct inet6_dev *in6_dev; 2668 struct net *net = dev_net(dev); 2669 2670 pinfo = (struct prefix_info *) opt; 2671 2672 if (len < sizeof(struct prefix_info)) { 2673 netdev_dbg(dev, "addrconf: prefix option too short\n"); 2674 return; 2675 } 2676 2677 /* 2678 * Validation checks ([ADDRCONF], page 19) 2679 */ 2680 2681 addr_type = ipv6_addr_type(&pinfo->prefix); 2682 2683 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2684 return; 2685 2686 valid_lft = ntohl(pinfo->valid); 2687 prefered_lft = ntohl(pinfo->prefered); 2688 2689 if (prefered_lft > valid_lft) { 2690 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2691 return; 2692 } 2693 2694 in6_dev = in6_dev_get(dev); 2695 2696 if (!in6_dev) { 2697 net_dbg_ratelimited("addrconf: device %s not configured\n", 2698 dev->name); 2699 return; 2700 } 2701 2702 /* 2703 * Two things going on here: 2704 * 1) Add routes for on-link prefixes 2705 * 2) Configure prefixes with the auto flag set 2706 */ 2707 2708 if (pinfo->onlink) { 2709 struct fib6_info *rt; 2710 unsigned long rt_expires; 2711 2712 /* Avoid arithmetic overflow. Really, we could 2713 * save rt_expires in seconds, likely valid_lft, 2714 * but it would require division in fib gc, that it 2715 * not good. 2716 */ 2717 if (HZ > USER_HZ) 2718 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2719 else 2720 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2721 2722 if (addrconf_finite_timeout(rt_expires)) 2723 rt_expires *= HZ; 2724 2725 rt = addrconf_get_prefix_route(&pinfo->prefix, 2726 pinfo->prefix_len, 2727 dev, 2728 RTF_ADDRCONF | RTF_PREFIX_RT, 2729 RTF_DEFAULT, true); 2730 2731 if (rt) { 2732 /* Autoconf prefix route */ 2733 if (valid_lft == 0) { 2734 ip6_del_rt(net, rt, false); 2735 rt = NULL; 2736 } else if (addrconf_finite_timeout(rt_expires)) { 2737 /* not infinity */ 2738 fib6_set_expires(rt, jiffies + rt_expires); 2739 } else { 2740 fib6_clean_expires(rt); 2741 } 2742 } else if (valid_lft) { 2743 clock_t expires = 0; 2744 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2745 if (addrconf_finite_timeout(rt_expires)) { 2746 /* not infinity */ 2747 flags |= RTF_EXPIRES; 2748 expires = jiffies_to_clock_t(rt_expires); 2749 } 2750 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2751 0, dev, expires, flags, 2752 GFP_ATOMIC); 2753 } 2754 fib6_info_release(rt); 2755 } 2756 2757 /* Try to figure out our local address for this prefix */ 2758 2759 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2760 struct in6_addr addr; 2761 bool tokenized = false, dev_addr_generated = false; 2762 2763 if (pinfo->prefix_len == 64) { 2764 memcpy(&addr, &pinfo->prefix, 8); 2765 2766 if (!ipv6_addr_any(&in6_dev->token)) { 2767 read_lock_bh(&in6_dev->lock); 2768 memcpy(addr.s6_addr + 8, 2769 in6_dev->token.s6_addr + 8, 8); 2770 read_unlock_bh(&in6_dev->lock); 2771 tokenized = true; 2772 } else if (is_addr_mode_generate_stable(in6_dev) && 2773 !ipv6_generate_stable_address(&addr, 0, 2774 in6_dev)) { 2775 addr_flags |= IFA_F_STABLE_PRIVACY; 2776 goto ok; 2777 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2778 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2779 goto put; 2780 } else { 2781 dev_addr_generated = true; 2782 } 2783 goto ok; 2784 } 2785 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2786 pinfo->prefix_len); 2787 goto put; 2788 2789 ok: 2790 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2791 &addr, addr_type, 2792 addr_flags, sllao, 2793 tokenized, valid_lft, 2794 prefered_lft); 2795 if (err) 2796 goto put; 2797 2798 /* Ignore error case here because previous prefix add addr was 2799 * successful which will be notified. 2800 */ 2801 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2802 addr_type, addr_flags, sllao, 2803 tokenized, valid_lft, 2804 prefered_lft, 2805 dev_addr_generated); 2806 } 2807 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2808 put: 2809 in6_dev_put(in6_dev); 2810 } 2811 2812 static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev, 2813 struct in6_ifreq *ireq) 2814 { 2815 struct ip_tunnel_parm p = { }; 2816 int err; 2817 2818 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4)) 2819 return -EADDRNOTAVAIL; 2820 2821 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3]; 2822 p.iph.version = 4; 2823 p.iph.ihl = 5; 2824 p.iph.protocol = IPPROTO_IPV6; 2825 p.iph.ttl = 64; 2826 2827 if (!dev->netdev_ops->ndo_tunnel_ctl) 2828 return -EOPNOTSUPP; 2829 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL); 2830 if (err) 2831 return err; 2832 2833 dev = __dev_get_by_name(net, p.name); 2834 if (!dev) 2835 return -ENOBUFS; 2836 return dev_open(dev, NULL); 2837 } 2838 2839 /* 2840 * Set destination address. 2841 * Special case for SIT interfaces where we create a new "virtual" 2842 * device. 2843 */ 2844 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2845 { 2846 struct net_device *dev; 2847 struct in6_ifreq ireq; 2848 int err = -ENODEV; 2849 2850 if (!IS_ENABLED(CONFIG_IPV6_SIT)) 2851 return -ENODEV; 2852 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2853 return -EFAULT; 2854 2855 rtnl_lock(); 2856 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2857 if (dev && dev->type == ARPHRD_SIT) 2858 err = addrconf_set_sit_dstaddr(net, dev, &ireq); 2859 rtnl_unlock(); 2860 return err; 2861 } 2862 2863 static int ipv6_mc_config(struct sock *sk, bool join, 2864 const struct in6_addr *addr, int ifindex) 2865 { 2866 int ret; 2867 2868 ASSERT_RTNL(); 2869 2870 lock_sock(sk); 2871 if (join) 2872 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2873 else 2874 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2875 release_sock(sk); 2876 2877 return ret; 2878 } 2879 2880 /* 2881 * Manual configuration of address on an interface 2882 */ 2883 static int inet6_addr_add(struct net *net, int ifindex, 2884 struct ifa6_config *cfg, 2885 struct netlink_ext_ack *extack) 2886 { 2887 struct inet6_ifaddr *ifp; 2888 struct inet6_dev *idev; 2889 struct net_device *dev; 2890 unsigned long timeout; 2891 clock_t expires; 2892 u32 flags; 2893 2894 ASSERT_RTNL(); 2895 2896 if (cfg->plen > 128) 2897 return -EINVAL; 2898 2899 /* check the lifetime */ 2900 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 2901 return -EINVAL; 2902 2903 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) 2904 return -EINVAL; 2905 2906 dev = __dev_get_by_index(net, ifindex); 2907 if (!dev) 2908 return -ENODEV; 2909 2910 idev = addrconf_add_dev(dev); 2911 if (IS_ERR(idev)) 2912 return PTR_ERR(idev); 2913 2914 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2915 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2916 true, cfg->pfx, ifindex); 2917 2918 if (ret < 0) 2919 return ret; 2920 } 2921 2922 cfg->scope = ipv6_addr_scope(cfg->pfx); 2923 2924 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 2925 if (addrconf_finite_timeout(timeout)) { 2926 expires = jiffies_to_clock_t(timeout * HZ); 2927 cfg->valid_lft = timeout; 2928 flags = RTF_EXPIRES; 2929 } else { 2930 expires = 0; 2931 flags = 0; 2932 cfg->ifa_flags |= IFA_F_PERMANENT; 2933 } 2934 2935 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 2936 if (addrconf_finite_timeout(timeout)) { 2937 if (timeout == 0) 2938 cfg->ifa_flags |= IFA_F_DEPRECATED; 2939 cfg->preferred_lft = timeout; 2940 } 2941 2942 ifp = ipv6_add_addr(idev, cfg, true, extack); 2943 if (!IS_ERR(ifp)) { 2944 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 2945 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 2946 ifp->rt_priority, dev, expires, 2947 flags, GFP_KERNEL); 2948 } 2949 2950 /* Send a netlink notification if DAD is enabled and 2951 * optimistic flag is not set 2952 */ 2953 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD))) 2954 ipv6_ifa_notify(0, ifp); 2955 /* 2956 * Note that section 3.1 of RFC 4429 indicates 2957 * that the Optimistic flag should not be set for 2958 * manually configured addresses 2959 */ 2960 addrconf_dad_start(ifp); 2961 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR) 2962 manage_tempaddrs(idev, ifp, cfg->valid_lft, 2963 cfg->preferred_lft, true, jiffies); 2964 in6_ifa_put(ifp); 2965 addrconf_verify_rtnl(); 2966 return 0; 2967 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2968 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false, 2969 cfg->pfx, ifindex); 2970 } 2971 2972 return PTR_ERR(ifp); 2973 } 2974 2975 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2976 const struct in6_addr *pfx, unsigned int plen) 2977 { 2978 struct inet6_ifaddr *ifp; 2979 struct inet6_dev *idev; 2980 struct net_device *dev; 2981 2982 if (plen > 128) 2983 return -EINVAL; 2984 2985 dev = __dev_get_by_index(net, ifindex); 2986 if (!dev) 2987 return -ENODEV; 2988 2989 idev = __in6_dev_get(dev); 2990 if (!idev) 2991 return -ENXIO; 2992 2993 read_lock_bh(&idev->lock); 2994 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2995 if (ifp->prefix_len == plen && 2996 ipv6_addr_equal(pfx, &ifp->addr)) { 2997 in6_ifa_hold(ifp); 2998 read_unlock_bh(&idev->lock); 2999 3000 if (!(ifp->flags & IFA_F_TEMPORARY) && 3001 (ifa_flags & IFA_F_MANAGETEMPADDR)) 3002 manage_tempaddrs(idev, ifp, 0, 0, false, 3003 jiffies); 3004 ipv6_del_addr(ifp); 3005 addrconf_verify_rtnl(); 3006 if (ipv6_addr_is_multicast(pfx)) { 3007 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 3008 false, pfx, dev->ifindex); 3009 } 3010 return 0; 3011 } 3012 } 3013 read_unlock_bh(&idev->lock); 3014 return -EADDRNOTAVAIL; 3015 } 3016 3017 3018 int addrconf_add_ifaddr(struct net *net, void __user *arg) 3019 { 3020 struct ifa6_config cfg = { 3021 .ifa_flags = IFA_F_PERMANENT, 3022 .preferred_lft = INFINITY_LIFE_TIME, 3023 .valid_lft = INFINITY_LIFE_TIME, 3024 }; 3025 struct in6_ifreq ireq; 3026 int err; 3027 3028 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3029 return -EPERM; 3030 3031 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3032 return -EFAULT; 3033 3034 cfg.pfx = &ireq.ifr6_addr; 3035 cfg.plen = ireq.ifr6_prefixlen; 3036 3037 rtnl_lock(); 3038 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL); 3039 rtnl_unlock(); 3040 return err; 3041 } 3042 3043 int addrconf_del_ifaddr(struct net *net, void __user *arg) 3044 { 3045 struct in6_ifreq ireq; 3046 int err; 3047 3048 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3049 return -EPERM; 3050 3051 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3052 return -EFAULT; 3053 3054 rtnl_lock(); 3055 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 3056 ireq.ifr6_prefixlen); 3057 rtnl_unlock(); 3058 return err; 3059 } 3060 3061 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 3062 int plen, int scope) 3063 { 3064 struct inet6_ifaddr *ifp; 3065 struct ifa6_config cfg = { 3066 .pfx = addr, 3067 .plen = plen, 3068 .ifa_flags = IFA_F_PERMANENT, 3069 .valid_lft = INFINITY_LIFE_TIME, 3070 .preferred_lft = INFINITY_LIFE_TIME, 3071 .scope = scope 3072 }; 3073 3074 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3075 if (!IS_ERR(ifp)) { 3076 spin_lock_bh(&ifp->lock); 3077 ifp->flags &= ~IFA_F_TENTATIVE; 3078 spin_unlock_bh(&ifp->lock); 3079 rt_genid_bump_ipv6(dev_net(idev->dev)); 3080 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3081 in6_ifa_put(ifp); 3082 } 3083 } 3084 3085 #if IS_ENABLED(CONFIG_IPV6_SIT) 3086 static void sit_add_v4_addrs(struct inet6_dev *idev) 3087 { 3088 struct in6_addr addr; 3089 struct net_device *dev; 3090 struct net *net = dev_net(idev->dev); 3091 int scope, plen; 3092 u32 pflags = 0; 3093 3094 ASSERT_RTNL(); 3095 3096 memset(&addr, 0, sizeof(struct in6_addr)); 3097 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 3098 3099 if (idev->dev->flags&IFF_POINTOPOINT) { 3100 addr.s6_addr32[0] = htonl(0xfe800000); 3101 scope = IFA_LINK; 3102 plen = 64; 3103 } else { 3104 scope = IPV6_ADDR_COMPATv4; 3105 plen = 96; 3106 pflags |= RTF_NONEXTHOP; 3107 } 3108 3109 if (addr.s6_addr32[3]) { 3110 add_addr(idev, &addr, plen, scope); 3111 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags, 3112 GFP_KERNEL); 3113 return; 3114 } 3115 3116 for_each_netdev(net, dev) { 3117 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3118 if (in_dev && (dev->flags & IFF_UP)) { 3119 struct in_ifaddr *ifa; 3120 int flag = scope; 3121 3122 in_dev_for_each_ifa_rtnl(ifa, in_dev) { 3123 addr.s6_addr32[3] = ifa->ifa_local; 3124 3125 if (ifa->ifa_scope == RT_SCOPE_LINK) 3126 continue; 3127 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3128 if (idev->dev->flags&IFF_POINTOPOINT) 3129 continue; 3130 flag |= IFA_HOST; 3131 } 3132 3133 add_addr(idev, &addr, plen, flag); 3134 addrconf_prefix_route(&addr, plen, 0, idev->dev, 3135 0, pflags, GFP_KERNEL); 3136 } 3137 } 3138 } 3139 } 3140 #endif 3141 3142 static void init_loopback(struct net_device *dev) 3143 { 3144 struct inet6_dev *idev; 3145 3146 /* ::1 */ 3147 3148 ASSERT_RTNL(); 3149 3150 idev = ipv6_find_idev(dev); 3151 if (IS_ERR(idev)) { 3152 pr_debug("%s: add_dev failed\n", __func__); 3153 return; 3154 } 3155 3156 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 3157 } 3158 3159 void addrconf_add_linklocal(struct inet6_dev *idev, 3160 const struct in6_addr *addr, u32 flags) 3161 { 3162 struct ifa6_config cfg = { 3163 .pfx = addr, 3164 .plen = 64, 3165 .ifa_flags = flags | IFA_F_PERMANENT, 3166 .valid_lft = INFINITY_LIFE_TIME, 3167 .preferred_lft = INFINITY_LIFE_TIME, 3168 .scope = IFA_LINK 3169 }; 3170 struct inet6_ifaddr *ifp; 3171 3172 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3173 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad || 3174 idev->cnf.optimistic_dad) && 3175 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3176 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 3177 #endif 3178 3179 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3180 if (!IS_ERR(ifp)) { 3181 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev, 3182 0, 0, GFP_ATOMIC); 3183 addrconf_dad_start(ifp); 3184 in6_ifa_put(ifp); 3185 } 3186 } 3187 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3188 3189 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3190 { 3191 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3192 return true; 3193 3194 if (address.s6_addr32[2] == htonl(0x02005eff) && 3195 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3196 return true; 3197 3198 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3199 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3200 return true; 3201 3202 return false; 3203 } 3204 3205 static int ipv6_generate_stable_address(struct in6_addr *address, 3206 u8 dad_count, 3207 const struct inet6_dev *idev) 3208 { 3209 static DEFINE_SPINLOCK(lock); 3210 static __u32 digest[SHA1_DIGEST_WORDS]; 3211 static __u32 workspace[SHA1_WORKSPACE_WORDS]; 3212 3213 static union { 3214 char __data[SHA1_BLOCK_SIZE]; 3215 struct { 3216 struct in6_addr secret; 3217 __be32 prefix[2]; 3218 unsigned char hwaddr[MAX_ADDR_LEN]; 3219 u8 dad_count; 3220 } __packed; 3221 } data; 3222 3223 struct in6_addr secret; 3224 struct in6_addr temp; 3225 struct net *net = dev_net(idev->dev); 3226 3227 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3228 3229 if (idev->cnf.stable_secret.initialized) 3230 secret = idev->cnf.stable_secret.secret; 3231 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3232 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3233 else 3234 return -1; 3235 3236 retry: 3237 spin_lock_bh(&lock); 3238 3239 sha1_init(digest); 3240 memset(&data, 0, sizeof(data)); 3241 memset(workspace, 0, sizeof(workspace)); 3242 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3243 data.prefix[0] = address->s6_addr32[0]; 3244 data.prefix[1] = address->s6_addr32[1]; 3245 data.secret = secret; 3246 data.dad_count = dad_count; 3247 3248 sha1_transform(digest, data.__data, workspace); 3249 3250 temp = *address; 3251 temp.s6_addr32[2] = (__force __be32)digest[0]; 3252 temp.s6_addr32[3] = (__force __be32)digest[1]; 3253 3254 spin_unlock_bh(&lock); 3255 3256 if (ipv6_reserved_interfaceid(temp)) { 3257 dad_count++; 3258 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3259 return -1; 3260 goto retry; 3261 } 3262 3263 *address = temp; 3264 return 0; 3265 } 3266 3267 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3268 { 3269 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3270 3271 if (s->initialized) 3272 return; 3273 s = &idev->cnf.stable_secret; 3274 get_random_bytes(&s->secret, sizeof(s->secret)); 3275 s->initialized = true; 3276 } 3277 3278 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3279 { 3280 struct in6_addr addr; 3281 3282 /* no link local addresses on L3 master devices */ 3283 if (netif_is_l3_master(idev->dev)) 3284 return; 3285 3286 /* no link local addresses on devices flagged as slaves */ 3287 if (idev->dev->flags & IFF_SLAVE) 3288 return; 3289 3290 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3291 3292 switch (idev->cnf.addr_gen_mode) { 3293 case IN6_ADDR_GEN_MODE_RANDOM: 3294 ipv6_gen_mode_random_init(idev); 3295 fallthrough; 3296 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3297 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3298 addrconf_add_linklocal(idev, &addr, 3299 IFA_F_STABLE_PRIVACY); 3300 else if (prefix_route) 3301 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3302 0, 0, GFP_KERNEL); 3303 break; 3304 case IN6_ADDR_GEN_MODE_EUI64: 3305 /* addrconf_add_linklocal also adds a prefix_route and we 3306 * only need to care about prefix routes if ipv6_generate_eui64 3307 * couldn't generate one. 3308 */ 3309 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3310 addrconf_add_linklocal(idev, &addr, 0); 3311 else if (prefix_route) 3312 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3313 0, 0, GFP_KERNEL); 3314 break; 3315 case IN6_ADDR_GEN_MODE_NONE: 3316 default: 3317 /* will not add any link local address */ 3318 break; 3319 } 3320 } 3321 3322 static void addrconf_dev_config(struct net_device *dev) 3323 { 3324 struct inet6_dev *idev; 3325 3326 ASSERT_RTNL(); 3327 3328 if ((dev->type != ARPHRD_ETHER) && 3329 (dev->type != ARPHRD_FDDI) && 3330 (dev->type != ARPHRD_ARCNET) && 3331 (dev->type != ARPHRD_INFINIBAND) && 3332 (dev->type != ARPHRD_IEEE1394) && 3333 (dev->type != ARPHRD_TUNNEL6) && 3334 (dev->type != ARPHRD_6LOWPAN) && 3335 (dev->type != ARPHRD_IP6GRE) && 3336 (dev->type != ARPHRD_IPGRE) && 3337 (dev->type != ARPHRD_TUNNEL) && 3338 (dev->type != ARPHRD_NONE) && 3339 (dev->type != ARPHRD_RAWIP)) { 3340 /* Alas, we support only Ethernet autoconfiguration. */ 3341 idev = __in6_dev_get(dev); 3342 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP && 3343 dev->flags & IFF_MULTICAST) 3344 ipv6_mc_up(idev); 3345 return; 3346 } 3347 3348 idev = addrconf_add_dev(dev); 3349 if (IS_ERR(idev)) 3350 return; 3351 3352 /* this device type has no EUI support */ 3353 if (dev->type == ARPHRD_NONE && 3354 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3355 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3356 3357 addrconf_addr_gen(idev, false); 3358 } 3359 3360 #if IS_ENABLED(CONFIG_IPV6_SIT) 3361 static void addrconf_sit_config(struct net_device *dev) 3362 { 3363 struct inet6_dev *idev; 3364 3365 ASSERT_RTNL(); 3366 3367 /* 3368 * Configure the tunnel with one of our IPv4 3369 * addresses... we should configure all of 3370 * our v4 addrs in the tunnel 3371 */ 3372 3373 idev = ipv6_find_idev(dev); 3374 if (IS_ERR(idev)) { 3375 pr_debug("%s: add_dev failed\n", __func__); 3376 return; 3377 } 3378 3379 if (dev->priv_flags & IFF_ISATAP) { 3380 addrconf_addr_gen(idev, false); 3381 return; 3382 } 3383 3384 sit_add_v4_addrs(idev); 3385 3386 if (dev->flags&IFF_POINTOPOINT) 3387 addrconf_add_mroute(dev); 3388 } 3389 #endif 3390 3391 #if IS_ENABLED(CONFIG_NET_IPGRE) 3392 static void addrconf_gre_config(struct net_device *dev) 3393 { 3394 struct inet6_dev *idev; 3395 3396 ASSERT_RTNL(); 3397 3398 idev = ipv6_find_idev(dev); 3399 if (IS_ERR(idev)) { 3400 pr_debug("%s: add_dev failed\n", __func__); 3401 return; 3402 } 3403 3404 addrconf_addr_gen(idev, true); 3405 if (dev->flags & IFF_POINTOPOINT) 3406 addrconf_add_mroute(dev); 3407 } 3408 #endif 3409 3410 static int fixup_permanent_addr(struct net *net, 3411 struct inet6_dev *idev, 3412 struct inet6_ifaddr *ifp) 3413 { 3414 /* !fib6_node means the host route was removed from the 3415 * FIB, for example, if 'lo' device is taken down. In that 3416 * case regenerate the host route. 3417 */ 3418 if (!ifp->rt || !ifp->rt->fib6_node) { 3419 struct fib6_info *f6i, *prev; 3420 3421 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false, 3422 GFP_ATOMIC); 3423 if (IS_ERR(f6i)) 3424 return PTR_ERR(f6i); 3425 3426 /* ifp->rt can be accessed outside of rtnl */ 3427 spin_lock(&ifp->lock); 3428 prev = ifp->rt; 3429 ifp->rt = f6i; 3430 spin_unlock(&ifp->lock); 3431 3432 fib6_info_release(prev); 3433 } 3434 3435 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3436 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3437 ifp->rt_priority, idev->dev, 0, 0, 3438 GFP_ATOMIC); 3439 } 3440 3441 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3442 addrconf_dad_start(ifp); 3443 3444 return 0; 3445 } 3446 3447 static void addrconf_permanent_addr(struct net *net, struct net_device *dev) 3448 { 3449 struct inet6_ifaddr *ifp, *tmp; 3450 struct inet6_dev *idev; 3451 3452 idev = __in6_dev_get(dev); 3453 if (!idev) 3454 return; 3455 3456 write_lock_bh(&idev->lock); 3457 3458 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3459 if ((ifp->flags & IFA_F_PERMANENT) && 3460 fixup_permanent_addr(net, idev, ifp) < 0) { 3461 write_unlock_bh(&idev->lock); 3462 in6_ifa_hold(ifp); 3463 ipv6_del_addr(ifp); 3464 write_lock_bh(&idev->lock); 3465 3466 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3467 idev->dev->name, &ifp->addr); 3468 } 3469 } 3470 3471 write_unlock_bh(&idev->lock); 3472 } 3473 3474 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3475 void *ptr) 3476 { 3477 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3478 struct netdev_notifier_change_info *change_info; 3479 struct netdev_notifier_changeupper_info *info; 3480 struct inet6_dev *idev = __in6_dev_get(dev); 3481 struct net *net = dev_net(dev); 3482 int run_pending = 0; 3483 int err; 3484 3485 switch (event) { 3486 case NETDEV_REGISTER: 3487 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3488 idev = ipv6_add_dev(dev); 3489 if (IS_ERR(idev)) 3490 return notifier_from_errno(PTR_ERR(idev)); 3491 } 3492 break; 3493 3494 case NETDEV_CHANGEMTU: 3495 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3496 if (dev->mtu < IPV6_MIN_MTU) { 3497 addrconf_ifdown(dev, dev != net->loopback_dev); 3498 break; 3499 } 3500 3501 if (idev) { 3502 rt6_mtu_change(dev, dev->mtu); 3503 idev->cnf.mtu6 = dev->mtu; 3504 break; 3505 } 3506 3507 /* allocate new idev */ 3508 idev = ipv6_add_dev(dev); 3509 if (IS_ERR(idev)) 3510 break; 3511 3512 /* device is still not ready */ 3513 if (!(idev->if_flags & IF_READY)) 3514 break; 3515 3516 run_pending = 1; 3517 fallthrough; 3518 case NETDEV_UP: 3519 case NETDEV_CHANGE: 3520 if (dev->flags & IFF_SLAVE) 3521 break; 3522 3523 if (idev && idev->cnf.disable_ipv6) 3524 break; 3525 3526 if (event == NETDEV_UP) { 3527 /* restore routes for permanent addresses */ 3528 addrconf_permanent_addr(net, dev); 3529 3530 if (!addrconf_link_ready(dev)) { 3531 /* device is not ready yet. */ 3532 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3533 dev->name); 3534 break; 3535 } 3536 3537 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3538 idev = ipv6_add_dev(dev); 3539 3540 if (!IS_ERR_OR_NULL(idev)) { 3541 idev->if_flags |= IF_READY; 3542 run_pending = 1; 3543 } 3544 } else if (event == NETDEV_CHANGE) { 3545 if (!addrconf_link_ready(dev)) { 3546 /* device is still not ready. */ 3547 rt6_sync_down_dev(dev, event); 3548 break; 3549 } 3550 3551 if (!IS_ERR_OR_NULL(idev)) { 3552 if (idev->if_flags & IF_READY) { 3553 /* device is already configured - 3554 * but resend MLD reports, we might 3555 * have roamed and need to update 3556 * multicast snooping switches 3557 */ 3558 ipv6_mc_up(idev); 3559 change_info = ptr; 3560 if (change_info->flags_changed & IFF_NOARP) 3561 addrconf_dad_run(idev, true); 3562 rt6_sync_up(dev, RTNH_F_LINKDOWN); 3563 break; 3564 } 3565 idev->if_flags |= IF_READY; 3566 } 3567 3568 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3569 dev->name); 3570 3571 run_pending = 1; 3572 } 3573 3574 switch (dev->type) { 3575 #if IS_ENABLED(CONFIG_IPV6_SIT) 3576 case ARPHRD_SIT: 3577 addrconf_sit_config(dev); 3578 break; 3579 #endif 3580 #if IS_ENABLED(CONFIG_NET_IPGRE) 3581 case ARPHRD_IPGRE: 3582 addrconf_gre_config(dev); 3583 break; 3584 #endif 3585 case ARPHRD_LOOPBACK: 3586 init_loopback(dev); 3587 break; 3588 3589 default: 3590 addrconf_dev_config(dev); 3591 break; 3592 } 3593 3594 if (!IS_ERR_OR_NULL(idev)) { 3595 if (run_pending) 3596 addrconf_dad_run(idev, false); 3597 3598 /* Device has an address by now */ 3599 rt6_sync_up(dev, RTNH_F_DEAD); 3600 3601 /* 3602 * If the MTU changed during the interface down, 3603 * when the interface up, the changed MTU must be 3604 * reflected in the idev as well as routers. 3605 */ 3606 if (idev->cnf.mtu6 != dev->mtu && 3607 dev->mtu >= IPV6_MIN_MTU) { 3608 rt6_mtu_change(dev, dev->mtu); 3609 idev->cnf.mtu6 = dev->mtu; 3610 } 3611 idev->tstamp = jiffies; 3612 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3613 3614 /* 3615 * If the changed mtu during down is lower than 3616 * IPV6_MIN_MTU stop IPv6 on this interface. 3617 */ 3618 if (dev->mtu < IPV6_MIN_MTU) 3619 addrconf_ifdown(dev, dev != net->loopback_dev); 3620 } 3621 break; 3622 3623 case NETDEV_DOWN: 3624 case NETDEV_UNREGISTER: 3625 /* 3626 * Remove all addresses from this interface. 3627 */ 3628 addrconf_ifdown(dev, event != NETDEV_DOWN); 3629 break; 3630 3631 case NETDEV_CHANGENAME: 3632 if (idev) { 3633 snmp6_unregister_dev(idev); 3634 addrconf_sysctl_unregister(idev); 3635 err = addrconf_sysctl_register(idev); 3636 if (err) 3637 return notifier_from_errno(err); 3638 err = snmp6_register_dev(idev); 3639 if (err) { 3640 addrconf_sysctl_unregister(idev); 3641 return notifier_from_errno(err); 3642 } 3643 } 3644 break; 3645 3646 case NETDEV_PRE_TYPE_CHANGE: 3647 case NETDEV_POST_TYPE_CHANGE: 3648 if (idev) 3649 addrconf_type_change(dev, event); 3650 break; 3651 3652 case NETDEV_CHANGEUPPER: 3653 info = ptr; 3654 3655 /* flush all routes if dev is linked to or unlinked from 3656 * an L3 master device (e.g., VRF) 3657 */ 3658 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3659 addrconf_ifdown(dev, false); 3660 } 3661 3662 return NOTIFY_OK; 3663 } 3664 3665 /* 3666 * addrconf module should be notified of a device going up 3667 */ 3668 static struct notifier_block ipv6_dev_notf = { 3669 .notifier_call = addrconf_notify, 3670 .priority = ADDRCONF_NOTIFY_PRIORITY, 3671 }; 3672 3673 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3674 { 3675 struct inet6_dev *idev; 3676 ASSERT_RTNL(); 3677 3678 idev = __in6_dev_get(dev); 3679 3680 if (event == NETDEV_POST_TYPE_CHANGE) 3681 ipv6_mc_remap(idev); 3682 else if (event == NETDEV_PRE_TYPE_CHANGE) 3683 ipv6_mc_unmap(idev); 3684 } 3685 3686 static bool addr_is_local(const struct in6_addr *addr) 3687 { 3688 return ipv6_addr_type(addr) & 3689 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3690 } 3691 3692 static int addrconf_ifdown(struct net_device *dev, bool unregister) 3693 { 3694 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN; 3695 struct net *net = dev_net(dev); 3696 struct inet6_dev *idev; 3697 struct inet6_ifaddr *ifa, *tmp; 3698 bool keep_addr = false; 3699 int state, i; 3700 3701 ASSERT_RTNL(); 3702 3703 rt6_disable_ip(dev, event); 3704 3705 idev = __in6_dev_get(dev); 3706 if (!idev) 3707 return -ENODEV; 3708 3709 /* 3710 * Step 1: remove reference to ipv6 device from parent device. 3711 * Do not dev_put! 3712 */ 3713 if (unregister) { 3714 idev->dead = 1; 3715 3716 /* protected by rtnl_lock */ 3717 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3718 3719 /* Step 1.5: remove snmp6 entry */ 3720 snmp6_unregister_dev(idev); 3721 3722 } 3723 3724 /* combine the user config with event to determine if permanent 3725 * addresses are to be removed from address hash table 3726 */ 3727 if (!unregister && !idev->cnf.disable_ipv6) { 3728 /* aggregate the system setting and interface setting */ 3729 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3730 3731 if (!_keep_addr) 3732 _keep_addr = idev->cnf.keep_addr_on_down; 3733 3734 keep_addr = (_keep_addr > 0); 3735 } 3736 3737 /* Step 2: clear hash table */ 3738 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3739 struct hlist_head *h = &inet6_addr_lst[i]; 3740 3741 spin_lock_bh(&addrconf_hash_lock); 3742 restart: 3743 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3744 if (ifa->idev == idev) { 3745 addrconf_del_dad_work(ifa); 3746 /* combined flag + permanent flag decide if 3747 * address is retained on a down event 3748 */ 3749 if (!keep_addr || 3750 !(ifa->flags & IFA_F_PERMANENT) || 3751 addr_is_local(&ifa->addr)) { 3752 hlist_del_init_rcu(&ifa->addr_lst); 3753 goto restart; 3754 } 3755 } 3756 } 3757 spin_unlock_bh(&addrconf_hash_lock); 3758 } 3759 3760 write_lock_bh(&idev->lock); 3761 3762 addrconf_del_rs_timer(idev); 3763 3764 /* Step 2: clear flags for stateless addrconf */ 3765 if (!unregister) 3766 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3767 3768 /* Step 3: clear tempaddr list */ 3769 while (!list_empty(&idev->tempaddr_list)) { 3770 ifa = list_first_entry(&idev->tempaddr_list, 3771 struct inet6_ifaddr, tmp_list); 3772 list_del(&ifa->tmp_list); 3773 write_unlock_bh(&idev->lock); 3774 spin_lock_bh(&ifa->lock); 3775 3776 if (ifa->ifpub) { 3777 in6_ifa_put(ifa->ifpub); 3778 ifa->ifpub = NULL; 3779 } 3780 spin_unlock_bh(&ifa->lock); 3781 in6_ifa_put(ifa); 3782 write_lock_bh(&idev->lock); 3783 } 3784 3785 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3786 struct fib6_info *rt = NULL; 3787 bool keep; 3788 3789 addrconf_del_dad_work(ifa); 3790 3791 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3792 !addr_is_local(&ifa->addr); 3793 3794 write_unlock_bh(&idev->lock); 3795 spin_lock_bh(&ifa->lock); 3796 3797 if (keep) { 3798 /* set state to skip the notifier below */ 3799 state = INET6_IFADDR_STATE_DEAD; 3800 ifa->state = INET6_IFADDR_STATE_PREDAD; 3801 if (!(ifa->flags & IFA_F_NODAD)) 3802 ifa->flags |= IFA_F_TENTATIVE; 3803 3804 rt = ifa->rt; 3805 ifa->rt = NULL; 3806 } else { 3807 state = ifa->state; 3808 ifa->state = INET6_IFADDR_STATE_DEAD; 3809 } 3810 3811 spin_unlock_bh(&ifa->lock); 3812 3813 if (rt) 3814 ip6_del_rt(net, rt, false); 3815 3816 if (state != INET6_IFADDR_STATE_DEAD) { 3817 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3818 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3819 } else { 3820 if (idev->cnf.forwarding) 3821 addrconf_leave_anycast(ifa); 3822 addrconf_leave_solict(ifa->idev, &ifa->addr); 3823 } 3824 3825 write_lock_bh(&idev->lock); 3826 if (!keep) { 3827 list_del_rcu(&ifa->if_list); 3828 in6_ifa_put(ifa); 3829 } 3830 } 3831 3832 write_unlock_bh(&idev->lock); 3833 3834 /* Step 5: Discard anycast and multicast list */ 3835 if (unregister) { 3836 ipv6_ac_destroy_dev(idev); 3837 ipv6_mc_destroy_dev(idev); 3838 } else { 3839 ipv6_mc_down(idev); 3840 } 3841 3842 idev->tstamp = jiffies; 3843 3844 /* Last: Shot the device (if unregistered) */ 3845 if (unregister) { 3846 addrconf_sysctl_unregister(idev); 3847 neigh_parms_release(&nd_tbl, idev->nd_parms); 3848 neigh_ifdown(&nd_tbl, dev); 3849 in6_dev_put(idev); 3850 } 3851 return 0; 3852 } 3853 3854 static void addrconf_rs_timer(struct timer_list *t) 3855 { 3856 struct inet6_dev *idev = from_timer(idev, t, rs_timer); 3857 struct net_device *dev = idev->dev; 3858 struct in6_addr lladdr; 3859 3860 write_lock(&idev->lock); 3861 if (idev->dead || !(idev->if_flags & IF_READY)) 3862 goto out; 3863 3864 if (!ipv6_accept_ra(idev)) 3865 goto out; 3866 3867 /* Announcement received after solicitation was sent */ 3868 if (idev->if_flags & IF_RA_RCVD) 3869 goto out; 3870 3871 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3872 write_unlock(&idev->lock); 3873 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3874 ndisc_send_rs(dev, &lladdr, 3875 &in6addr_linklocal_allrouters); 3876 else 3877 goto put; 3878 3879 write_lock(&idev->lock); 3880 idev->rs_interval = rfc3315_s14_backoff_update( 3881 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3882 /* The wait after the last probe can be shorter */ 3883 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3884 idev->cnf.rtr_solicits) ? 3885 idev->cnf.rtr_solicit_delay : 3886 idev->rs_interval); 3887 } else { 3888 /* 3889 * Note: we do not support deprecated "all on-link" 3890 * assumption any longer. 3891 */ 3892 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3893 } 3894 3895 out: 3896 write_unlock(&idev->lock); 3897 put: 3898 in6_dev_put(idev); 3899 } 3900 3901 /* 3902 * Duplicate Address Detection 3903 */ 3904 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3905 { 3906 unsigned long rand_num; 3907 struct inet6_dev *idev = ifp->idev; 3908 u64 nonce; 3909 3910 if (ifp->flags & IFA_F_OPTIMISTIC) 3911 rand_num = 0; 3912 else 3913 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3914 3915 nonce = 0; 3916 if (idev->cnf.enhanced_dad || 3917 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 3918 do 3919 get_random_bytes(&nonce, 6); 3920 while (nonce == 0); 3921 } 3922 ifp->dad_nonce = nonce; 3923 ifp->dad_probes = idev->cnf.dad_transmits; 3924 addrconf_mod_dad_work(ifp, rand_num); 3925 } 3926 3927 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3928 { 3929 struct inet6_dev *idev = ifp->idev; 3930 struct net_device *dev = idev->dev; 3931 bool bump_id, notify = false; 3932 struct net *net; 3933 3934 addrconf_join_solict(dev, &ifp->addr); 3935 3936 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3937 3938 read_lock_bh(&idev->lock); 3939 spin_lock(&ifp->lock); 3940 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3941 goto out; 3942 3943 net = dev_net(dev); 3944 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3945 (net->ipv6.devconf_all->accept_dad < 1 && 3946 idev->cnf.accept_dad < 1) || 3947 !(ifp->flags&IFA_F_TENTATIVE) || 3948 ifp->flags & IFA_F_NODAD) { 3949 bool send_na = false; 3950 3951 if (ifp->flags & IFA_F_TENTATIVE && 3952 !(ifp->flags & IFA_F_OPTIMISTIC)) 3953 send_na = true; 3954 bump_id = ifp->flags & IFA_F_TENTATIVE; 3955 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3956 spin_unlock(&ifp->lock); 3957 read_unlock_bh(&idev->lock); 3958 3959 addrconf_dad_completed(ifp, bump_id, send_na); 3960 return; 3961 } 3962 3963 if (!(idev->if_flags & IF_READY)) { 3964 spin_unlock(&ifp->lock); 3965 read_unlock_bh(&idev->lock); 3966 /* 3967 * If the device is not ready: 3968 * - keep it tentative if it is a permanent address. 3969 * - otherwise, kill it. 3970 */ 3971 in6_ifa_hold(ifp); 3972 addrconf_dad_stop(ifp, 0); 3973 return; 3974 } 3975 3976 /* 3977 * Optimistic nodes can start receiving 3978 * Frames right away 3979 */ 3980 if (ifp->flags & IFA_F_OPTIMISTIC) { 3981 ip6_ins_rt(net, ifp->rt); 3982 if (ipv6_use_optimistic_addr(net, idev)) { 3983 /* Because optimistic nodes can use this address, 3984 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3985 */ 3986 notify = true; 3987 } 3988 } 3989 3990 addrconf_dad_kick(ifp); 3991 out: 3992 spin_unlock(&ifp->lock); 3993 read_unlock_bh(&idev->lock); 3994 if (notify) 3995 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3996 } 3997 3998 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3999 { 4000 bool begin_dad = false; 4001 4002 spin_lock_bh(&ifp->lock); 4003 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 4004 ifp->state = INET6_IFADDR_STATE_PREDAD; 4005 begin_dad = true; 4006 } 4007 spin_unlock_bh(&ifp->lock); 4008 4009 if (begin_dad) 4010 addrconf_mod_dad_work(ifp, 0); 4011 } 4012 4013 static void addrconf_dad_work(struct work_struct *w) 4014 { 4015 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 4016 struct inet6_ifaddr, 4017 dad_work); 4018 struct inet6_dev *idev = ifp->idev; 4019 bool bump_id, disable_ipv6 = false; 4020 struct in6_addr mcaddr; 4021 4022 enum { 4023 DAD_PROCESS, 4024 DAD_BEGIN, 4025 DAD_ABORT, 4026 } action = DAD_PROCESS; 4027 4028 rtnl_lock(); 4029 4030 spin_lock_bh(&ifp->lock); 4031 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 4032 action = DAD_BEGIN; 4033 ifp->state = INET6_IFADDR_STATE_DAD; 4034 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 4035 action = DAD_ABORT; 4036 ifp->state = INET6_IFADDR_STATE_POSTDAD; 4037 4038 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 || 4039 idev->cnf.accept_dad > 1) && 4040 !idev->cnf.disable_ipv6 && 4041 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 4042 struct in6_addr addr; 4043 4044 addr.s6_addr32[0] = htonl(0xfe800000); 4045 addr.s6_addr32[1] = 0; 4046 4047 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 4048 ipv6_addr_equal(&ifp->addr, &addr)) { 4049 /* DAD failed for link-local based on MAC */ 4050 idev->cnf.disable_ipv6 = 1; 4051 4052 pr_info("%s: IPv6 being disabled!\n", 4053 ifp->idev->dev->name); 4054 disable_ipv6 = true; 4055 } 4056 } 4057 } 4058 spin_unlock_bh(&ifp->lock); 4059 4060 if (action == DAD_BEGIN) { 4061 addrconf_dad_begin(ifp); 4062 goto out; 4063 } else if (action == DAD_ABORT) { 4064 in6_ifa_hold(ifp); 4065 addrconf_dad_stop(ifp, 1); 4066 if (disable_ipv6) 4067 addrconf_ifdown(idev->dev, false); 4068 goto out; 4069 } 4070 4071 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 4072 goto out; 4073 4074 write_lock_bh(&idev->lock); 4075 if (idev->dead || !(idev->if_flags & IF_READY)) { 4076 write_unlock_bh(&idev->lock); 4077 goto out; 4078 } 4079 4080 spin_lock(&ifp->lock); 4081 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 4082 spin_unlock(&ifp->lock); 4083 write_unlock_bh(&idev->lock); 4084 goto out; 4085 } 4086 4087 if (ifp->dad_probes == 0) { 4088 bool send_na = false; 4089 4090 /* 4091 * DAD was successful 4092 */ 4093 4094 if (ifp->flags & IFA_F_TENTATIVE && 4095 !(ifp->flags & IFA_F_OPTIMISTIC)) 4096 send_na = true; 4097 bump_id = ifp->flags & IFA_F_TENTATIVE; 4098 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4099 spin_unlock(&ifp->lock); 4100 write_unlock_bh(&idev->lock); 4101 4102 addrconf_dad_completed(ifp, bump_id, send_na); 4103 4104 goto out; 4105 } 4106 4107 ifp->dad_probes--; 4108 addrconf_mod_dad_work(ifp, 4109 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), 4110 HZ/100)); 4111 spin_unlock(&ifp->lock); 4112 write_unlock_bh(&idev->lock); 4113 4114 /* send a neighbour solicitation for our addr */ 4115 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 4116 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 4117 ifp->dad_nonce); 4118 out: 4119 in6_ifa_put(ifp); 4120 rtnl_unlock(); 4121 } 4122 4123 /* ifp->idev must be at least read locked */ 4124 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4125 { 4126 struct inet6_ifaddr *ifpiter; 4127 struct inet6_dev *idev = ifp->idev; 4128 4129 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4130 if (ifpiter->scope > IFA_LINK) 4131 break; 4132 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4133 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4134 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4135 IFA_F_PERMANENT) 4136 return false; 4137 } 4138 return true; 4139 } 4140 4141 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 4142 bool send_na) 4143 { 4144 struct net_device *dev = ifp->idev->dev; 4145 struct in6_addr lladdr; 4146 bool send_rs, send_mld; 4147 4148 addrconf_del_dad_work(ifp); 4149 4150 /* 4151 * Configure the address for reception. Now it is valid. 4152 */ 4153 4154 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4155 4156 /* If added prefix is link local and we are prepared to process 4157 router advertisements, start sending router solicitations. 4158 */ 4159 4160 read_lock_bh(&ifp->idev->lock); 4161 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4162 send_rs = send_mld && 4163 ipv6_accept_ra(ifp->idev) && 4164 ifp->idev->cnf.rtr_solicits != 0 && 4165 (dev->flags&IFF_LOOPBACK) == 0; 4166 read_unlock_bh(&ifp->idev->lock); 4167 4168 /* While dad is in progress mld report's source address is in6_addrany. 4169 * Resend with proper ll now. 4170 */ 4171 if (send_mld) 4172 ipv6_mc_dad_complete(ifp->idev); 4173 4174 /* send unsolicited NA if enabled */ 4175 if (send_na && 4176 (ifp->idev->cnf.ndisc_notify || 4177 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) { 4178 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr, 4179 /*router=*/ !!ifp->idev->cnf.forwarding, 4180 /*solicited=*/ false, /*override=*/ true, 4181 /*inc_opt=*/ true); 4182 } 4183 4184 if (send_rs) { 4185 /* 4186 * If a host as already performed a random delay 4187 * [...] as part of DAD [...] there is no need 4188 * to delay again before sending the first RS 4189 */ 4190 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4191 return; 4192 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4193 4194 write_lock_bh(&ifp->idev->lock); 4195 spin_lock(&ifp->lock); 4196 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4197 ifp->idev->cnf.rtr_solicit_interval); 4198 ifp->idev->rs_probes = 1; 4199 ifp->idev->if_flags |= IF_RS_SENT; 4200 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4201 spin_unlock(&ifp->lock); 4202 write_unlock_bh(&ifp->idev->lock); 4203 } 4204 4205 if (bump_id) 4206 rt_genid_bump_ipv6(dev_net(dev)); 4207 4208 /* Make sure that a new temporary address will be created 4209 * before this temporary address becomes deprecated. 4210 */ 4211 if (ifp->flags & IFA_F_TEMPORARY) 4212 addrconf_verify_rtnl(); 4213 } 4214 4215 static void addrconf_dad_run(struct inet6_dev *idev, bool restart) 4216 { 4217 struct inet6_ifaddr *ifp; 4218 4219 read_lock_bh(&idev->lock); 4220 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4221 spin_lock(&ifp->lock); 4222 if ((ifp->flags & IFA_F_TENTATIVE && 4223 ifp->state == INET6_IFADDR_STATE_DAD) || restart) { 4224 if (restart) 4225 ifp->state = INET6_IFADDR_STATE_PREDAD; 4226 addrconf_dad_kick(ifp); 4227 } 4228 spin_unlock(&ifp->lock); 4229 } 4230 read_unlock_bh(&idev->lock); 4231 } 4232 4233 #ifdef CONFIG_PROC_FS 4234 struct if6_iter_state { 4235 struct seq_net_private p; 4236 int bucket; 4237 int offset; 4238 }; 4239 4240 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4241 { 4242 struct if6_iter_state *state = seq->private; 4243 struct net *net = seq_file_net(seq); 4244 struct inet6_ifaddr *ifa = NULL; 4245 int p = 0; 4246 4247 /* initial bucket if pos is 0 */ 4248 if (pos == 0) { 4249 state->bucket = 0; 4250 state->offset = 0; 4251 } 4252 4253 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4254 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket], 4255 addr_lst) { 4256 if (!net_eq(dev_net(ifa->idev->dev), net)) 4257 continue; 4258 /* sync with offset */ 4259 if (p < state->offset) { 4260 p++; 4261 continue; 4262 } 4263 return ifa; 4264 } 4265 4266 /* prepare for next bucket */ 4267 state->offset = 0; 4268 p = 0; 4269 } 4270 return NULL; 4271 } 4272 4273 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4274 struct inet6_ifaddr *ifa) 4275 { 4276 struct if6_iter_state *state = seq->private; 4277 struct net *net = seq_file_net(seq); 4278 4279 hlist_for_each_entry_continue_rcu(ifa, addr_lst) { 4280 if (!net_eq(dev_net(ifa->idev->dev), net)) 4281 continue; 4282 state->offset++; 4283 return ifa; 4284 } 4285 4286 state->offset = 0; 4287 while (++state->bucket < IN6_ADDR_HSIZE) { 4288 hlist_for_each_entry_rcu(ifa, 4289 &inet6_addr_lst[state->bucket], addr_lst) { 4290 if (!net_eq(dev_net(ifa->idev->dev), net)) 4291 continue; 4292 return ifa; 4293 } 4294 } 4295 4296 return NULL; 4297 } 4298 4299 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4300 __acquires(rcu) 4301 { 4302 rcu_read_lock(); 4303 return if6_get_first(seq, *pos); 4304 } 4305 4306 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4307 { 4308 struct inet6_ifaddr *ifa; 4309 4310 ifa = if6_get_next(seq, v); 4311 ++*pos; 4312 return ifa; 4313 } 4314 4315 static void if6_seq_stop(struct seq_file *seq, void *v) 4316 __releases(rcu) 4317 { 4318 rcu_read_unlock(); 4319 } 4320 4321 static int if6_seq_show(struct seq_file *seq, void *v) 4322 { 4323 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4324 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4325 &ifp->addr, 4326 ifp->idev->dev->ifindex, 4327 ifp->prefix_len, 4328 ifp->scope, 4329 (u8) ifp->flags, 4330 ifp->idev->dev->name); 4331 return 0; 4332 } 4333 4334 static const struct seq_operations if6_seq_ops = { 4335 .start = if6_seq_start, 4336 .next = if6_seq_next, 4337 .show = if6_seq_show, 4338 .stop = if6_seq_stop, 4339 }; 4340 4341 static int __net_init if6_proc_net_init(struct net *net) 4342 { 4343 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops, 4344 sizeof(struct if6_iter_state))) 4345 return -ENOMEM; 4346 return 0; 4347 } 4348 4349 static void __net_exit if6_proc_net_exit(struct net *net) 4350 { 4351 remove_proc_entry("if_inet6", net->proc_net); 4352 } 4353 4354 static struct pernet_operations if6_proc_net_ops = { 4355 .init = if6_proc_net_init, 4356 .exit = if6_proc_net_exit, 4357 }; 4358 4359 int __init if6_proc_init(void) 4360 { 4361 return register_pernet_subsys(&if6_proc_net_ops); 4362 } 4363 4364 void if6_proc_exit(void) 4365 { 4366 unregister_pernet_subsys(&if6_proc_net_ops); 4367 } 4368 #endif /* CONFIG_PROC_FS */ 4369 4370 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4371 /* Check if address is a home address configured on any interface. */ 4372 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4373 { 4374 unsigned int hash = inet6_addr_hash(net, addr); 4375 struct inet6_ifaddr *ifp = NULL; 4376 int ret = 0; 4377 4378 rcu_read_lock(); 4379 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 4380 if (!net_eq(dev_net(ifp->idev->dev), net)) 4381 continue; 4382 if (ipv6_addr_equal(&ifp->addr, addr) && 4383 (ifp->flags & IFA_F_HOMEADDRESS)) { 4384 ret = 1; 4385 break; 4386 } 4387 } 4388 rcu_read_unlock(); 4389 return ret; 4390 } 4391 #endif 4392 4393 /* RFC6554 has some algorithm to avoid loops in segment routing by 4394 * checking if the segments contains any of a local interface address. 4395 * 4396 * Quote: 4397 * 4398 * To detect loops in the SRH, a router MUST determine if the SRH 4399 * includes multiple addresses assigned to any interface on that router. 4400 * If such addresses appear more than once and are separated by at least 4401 * one address not assigned to that router. 4402 */ 4403 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs, 4404 unsigned char nsegs) 4405 { 4406 const struct in6_addr *addr; 4407 int i, ret = 0, found = 0; 4408 struct inet6_ifaddr *ifp; 4409 bool separated = false; 4410 unsigned int hash; 4411 bool hash_found; 4412 4413 rcu_read_lock(); 4414 for (i = 0; i < nsegs; i++) { 4415 addr = &segs[i]; 4416 hash = inet6_addr_hash(net, addr); 4417 4418 hash_found = false; 4419 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 4420 if (!net_eq(dev_net(ifp->idev->dev), net)) 4421 continue; 4422 4423 if (ipv6_addr_equal(&ifp->addr, addr)) { 4424 hash_found = true; 4425 break; 4426 } 4427 } 4428 4429 if (hash_found) { 4430 if (found > 1 && separated) { 4431 ret = 1; 4432 break; 4433 } 4434 4435 separated = false; 4436 found++; 4437 } else { 4438 separated = true; 4439 } 4440 } 4441 rcu_read_unlock(); 4442 4443 return ret; 4444 } 4445 4446 /* 4447 * Periodic address status verification 4448 */ 4449 4450 static void addrconf_verify_rtnl(void) 4451 { 4452 unsigned long now, next, next_sec, next_sched; 4453 struct inet6_ifaddr *ifp; 4454 int i; 4455 4456 ASSERT_RTNL(); 4457 4458 rcu_read_lock_bh(); 4459 now = jiffies; 4460 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4461 4462 cancel_delayed_work(&addr_chk_work); 4463 4464 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4465 restart: 4466 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4467 unsigned long age; 4468 4469 /* When setting preferred_lft to a value not zero or 4470 * infinity, while valid_lft is infinity 4471 * IFA_F_PERMANENT has a non-infinity life time. 4472 */ 4473 if ((ifp->flags & IFA_F_PERMANENT) && 4474 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4475 continue; 4476 4477 spin_lock(&ifp->lock); 4478 /* We try to batch several events at once. */ 4479 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4480 4481 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4482 age >= ifp->valid_lft) { 4483 spin_unlock(&ifp->lock); 4484 in6_ifa_hold(ifp); 4485 ipv6_del_addr(ifp); 4486 goto restart; 4487 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4488 spin_unlock(&ifp->lock); 4489 continue; 4490 } else if (age >= ifp->prefered_lft) { 4491 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4492 int deprecate = 0; 4493 4494 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4495 deprecate = 1; 4496 ifp->flags |= IFA_F_DEPRECATED; 4497 } 4498 4499 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4500 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4501 next = ifp->tstamp + ifp->valid_lft * HZ; 4502 4503 spin_unlock(&ifp->lock); 4504 4505 if (deprecate) { 4506 in6_ifa_hold(ifp); 4507 4508 ipv6_ifa_notify(0, ifp); 4509 in6_ifa_put(ifp); 4510 goto restart; 4511 } 4512 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4513 !(ifp->flags&IFA_F_TENTATIVE)) { 4514 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4515 ifp->idev->cnf.dad_transmits * 4516 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 4517 4518 if (age >= ifp->prefered_lft - regen_advance) { 4519 struct inet6_ifaddr *ifpub = ifp->ifpub; 4520 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4521 next = ifp->tstamp + ifp->prefered_lft * HZ; 4522 if (!ifp->regen_count && ifpub) { 4523 ifp->regen_count++; 4524 in6_ifa_hold(ifp); 4525 in6_ifa_hold(ifpub); 4526 spin_unlock(&ifp->lock); 4527 4528 spin_lock(&ifpub->lock); 4529 ifpub->regen_count = 0; 4530 spin_unlock(&ifpub->lock); 4531 rcu_read_unlock_bh(); 4532 ipv6_create_tempaddr(ifpub, true); 4533 in6_ifa_put(ifpub); 4534 in6_ifa_put(ifp); 4535 rcu_read_lock_bh(); 4536 goto restart; 4537 } 4538 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4539 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4540 spin_unlock(&ifp->lock); 4541 } else { 4542 /* ifp->prefered_lft <= ifp->valid_lft */ 4543 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4544 next = ifp->tstamp + ifp->prefered_lft * HZ; 4545 spin_unlock(&ifp->lock); 4546 } 4547 } 4548 } 4549 4550 next_sec = round_jiffies_up(next); 4551 next_sched = next; 4552 4553 /* If rounded timeout is accurate enough, accept it. */ 4554 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4555 next_sched = next_sec; 4556 4557 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4558 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4559 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4560 4561 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4562 now, next, next_sec, next_sched); 4563 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4564 rcu_read_unlock_bh(); 4565 } 4566 4567 static void addrconf_verify_work(struct work_struct *w) 4568 { 4569 rtnl_lock(); 4570 addrconf_verify_rtnl(); 4571 rtnl_unlock(); 4572 } 4573 4574 static void addrconf_verify(void) 4575 { 4576 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4577 } 4578 4579 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4580 struct in6_addr **peer_pfx) 4581 { 4582 struct in6_addr *pfx = NULL; 4583 4584 *peer_pfx = NULL; 4585 4586 if (addr) 4587 pfx = nla_data(addr); 4588 4589 if (local) { 4590 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4591 *peer_pfx = pfx; 4592 pfx = nla_data(local); 4593 } 4594 4595 return pfx; 4596 } 4597 4598 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4599 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4600 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4601 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4602 [IFA_FLAGS] = { .len = sizeof(u32) }, 4603 [IFA_RT_PRIORITY] = { .len = sizeof(u32) }, 4604 [IFA_TARGET_NETNSID] = { .type = NLA_S32 }, 4605 }; 4606 4607 static int 4608 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4609 struct netlink_ext_ack *extack) 4610 { 4611 struct net *net = sock_net(skb->sk); 4612 struct ifaddrmsg *ifm; 4613 struct nlattr *tb[IFA_MAX+1]; 4614 struct in6_addr *pfx, *peer_pfx; 4615 u32 ifa_flags; 4616 int err; 4617 4618 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4619 ifa_ipv6_policy, extack); 4620 if (err < 0) 4621 return err; 4622 4623 ifm = nlmsg_data(nlh); 4624 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4625 if (!pfx) 4626 return -EINVAL; 4627 4628 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4629 4630 /* We ignore other flags so far. */ 4631 ifa_flags &= IFA_F_MANAGETEMPADDR; 4632 4633 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4634 ifm->ifa_prefixlen); 4635 } 4636 4637 static int modify_prefix_route(struct inet6_ifaddr *ifp, 4638 unsigned long expires, u32 flags, 4639 bool modify_peer) 4640 { 4641 struct fib6_info *f6i; 4642 u32 prio; 4643 4644 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4645 ifp->prefix_len, 4646 ifp->idev->dev, 0, RTF_DEFAULT, true); 4647 if (!f6i) 4648 return -ENOENT; 4649 4650 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF; 4651 if (f6i->fib6_metric != prio) { 4652 /* delete old one */ 4653 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 4654 4655 /* add new one */ 4656 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4657 ifp->prefix_len, 4658 ifp->rt_priority, ifp->idev->dev, 4659 expires, flags, GFP_KERNEL); 4660 } else { 4661 if (!expires) 4662 fib6_clean_expires(f6i); 4663 else 4664 fib6_set_expires(f6i, expires); 4665 4666 fib6_info_release(f6i); 4667 } 4668 4669 return 0; 4670 } 4671 4672 static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg) 4673 { 4674 u32 flags; 4675 clock_t expires; 4676 unsigned long timeout; 4677 bool was_managetempaddr; 4678 bool had_prefixroute; 4679 bool new_peer = false; 4680 4681 ASSERT_RTNL(); 4682 4683 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 4684 return -EINVAL; 4685 4686 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && 4687 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4688 return -EINVAL; 4689 4690 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED) 4691 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC; 4692 4693 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 4694 if (addrconf_finite_timeout(timeout)) { 4695 expires = jiffies_to_clock_t(timeout * HZ); 4696 cfg->valid_lft = timeout; 4697 flags = RTF_EXPIRES; 4698 } else { 4699 expires = 0; 4700 flags = 0; 4701 cfg->ifa_flags |= IFA_F_PERMANENT; 4702 } 4703 4704 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 4705 if (addrconf_finite_timeout(timeout)) { 4706 if (timeout == 0) 4707 cfg->ifa_flags |= IFA_F_DEPRECATED; 4708 cfg->preferred_lft = timeout; 4709 } 4710 4711 if (cfg->peer_pfx && 4712 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) { 4713 if (!ipv6_addr_any(&ifp->peer_addr)) 4714 cleanup_prefix_route(ifp, expires, true, true); 4715 new_peer = true; 4716 } 4717 4718 spin_lock_bh(&ifp->lock); 4719 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4720 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4721 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4722 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4723 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4724 IFA_F_NOPREFIXROUTE); 4725 ifp->flags |= cfg->ifa_flags; 4726 ifp->tstamp = jiffies; 4727 ifp->valid_lft = cfg->valid_lft; 4728 ifp->prefered_lft = cfg->preferred_lft; 4729 4730 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority) 4731 ifp->rt_priority = cfg->rt_priority; 4732 4733 if (new_peer) 4734 ifp->peer_addr = *cfg->peer_pfx; 4735 4736 spin_unlock_bh(&ifp->lock); 4737 if (!(ifp->flags&IFA_F_TENTATIVE)) 4738 ipv6_ifa_notify(0, ifp); 4739 4740 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 4741 int rc = -ENOENT; 4742 4743 if (had_prefixroute) 4744 rc = modify_prefix_route(ifp, expires, flags, false); 4745 4746 /* prefix route could have been deleted; if so restore it */ 4747 if (rc == -ENOENT) { 4748 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4749 ifp->rt_priority, ifp->idev->dev, 4750 expires, flags, GFP_KERNEL); 4751 } 4752 4753 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr)) 4754 rc = modify_prefix_route(ifp, expires, flags, true); 4755 4756 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) { 4757 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len, 4758 ifp->rt_priority, ifp->idev->dev, 4759 expires, flags, GFP_KERNEL); 4760 } 4761 } else if (had_prefixroute) { 4762 enum cleanup_prefix_rt_t action; 4763 unsigned long rt_expires; 4764 4765 write_lock_bh(&ifp->idev->lock); 4766 action = check_cleanup_prefix_route(ifp, &rt_expires); 4767 write_unlock_bh(&ifp->idev->lock); 4768 4769 if (action != CLEANUP_PREFIX_RT_NOP) { 4770 cleanup_prefix_route(ifp, rt_expires, 4771 action == CLEANUP_PREFIX_RT_DEL, false); 4772 } 4773 } 4774 4775 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4776 if (was_managetempaddr && 4777 !(ifp->flags & IFA_F_MANAGETEMPADDR)) { 4778 cfg->valid_lft = 0; 4779 cfg->preferred_lft = 0; 4780 } 4781 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft, 4782 cfg->preferred_lft, !was_managetempaddr, 4783 jiffies); 4784 } 4785 4786 addrconf_verify_rtnl(); 4787 4788 return 0; 4789 } 4790 4791 static int 4792 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4793 struct netlink_ext_ack *extack) 4794 { 4795 struct net *net = sock_net(skb->sk); 4796 struct ifaddrmsg *ifm; 4797 struct nlattr *tb[IFA_MAX+1]; 4798 struct in6_addr *peer_pfx; 4799 struct inet6_ifaddr *ifa; 4800 struct net_device *dev; 4801 struct inet6_dev *idev; 4802 struct ifa6_config cfg; 4803 int err; 4804 4805 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4806 ifa_ipv6_policy, extack); 4807 if (err < 0) 4808 return err; 4809 4810 memset(&cfg, 0, sizeof(cfg)); 4811 4812 ifm = nlmsg_data(nlh); 4813 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4814 if (!cfg.pfx) 4815 return -EINVAL; 4816 4817 cfg.peer_pfx = peer_pfx; 4818 cfg.plen = ifm->ifa_prefixlen; 4819 if (tb[IFA_RT_PRIORITY]) 4820 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]); 4821 4822 cfg.valid_lft = INFINITY_LIFE_TIME; 4823 cfg.preferred_lft = INFINITY_LIFE_TIME; 4824 4825 if (tb[IFA_CACHEINFO]) { 4826 struct ifa_cacheinfo *ci; 4827 4828 ci = nla_data(tb[IFA_CACHEINFO]); 4829 cfg.valid_lft = ci->ifa_valid; 4830 cfg.preferred_lft = ci->ifa_prefered; 4831 } 4832 4833 dev = __dev_get_by_index(net, ifm->ifa_index); 4834 if (!dev) 4835 return -ENODEV; 4836 4837 if (tb[IFA_FLAGS]) 4838 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]); 4839 else 4840 cfg.ifa_flags = ifm->ifa_flags; 4841 4842 /* We ignore other flags so far. */ 4843 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | 4844 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE | 4845 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC; 4846 4847 idev = ipv6_find_idev(dev); 4848 if (IS_ERR(idev)) 4849 return PTR_ERR(idev); 4850 4851 if (!ipv6_allow_optimistic_dad(net, idev)) 4852 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC; 4853 4854 if (cfg.ifa_flags & IFA_F_NODAD && 4855 cfg.ifa_flags & IFA_F_OPTIMISTIC) { 4856 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive"); 4857 return -EINVAL; 4858 } 4859 4860 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1); 4861 if (!ifa) { 4862 /* 4863 * It would be best to check for !NLM_F_CREATE here but 4864 * userspace already relies on not having to provide this. 4865 */ 4866 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack); 4867 } 4868 4869 if (nlh->nlmsg_flags & NLM_F_EXCL || 4870 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4871 err = -EEXIST; 4872 else 4873 err = inet6_addr_modify(ifa, &cfg); 4874 4875 in6_ifa_put(ifa); 4876 4877 return err; 4878 } 4879 4880 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4881 u8 scope, int ifindex) 4882 { 4883 struct ifaddrmsg *ifm; 4884 4885 ifm = nlmsg_data(nlh); 4886 ifm->ifa_family = AF_INET6; 4887 ifm->ifa_prefixlen = prefixlen; 4888 ifm->ifa_flags = flags; 4889 ifm->ifa_scope = scope; 4890 ifm->ifa_index = ifindex; 4891 } 4892 4893 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4894 unsigned long tstamp, u32 preferred, u32 valid) 4895 { 4896 struct ifa_cacheinfo ci; 4897 4898 ci.cstamp = cstamp_delta(cstamp); 4899 ci.tstamp = cstamp_delta(tstamp); 4900 ci.ifa_prefered = preferred; 4901 ci.ifa_valid = valid; 4902 4903 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4904 } 4905 4906 static inline int rt_scope(int ifa_scope) 4907 { 4908 if (ifa_scope & IFA_HOST) 4909 return RT_SCOPE_HOST; 4910 else if (ifa_scope & IFA_LINK) 4911 return RT_SCOPE_LINK; 4912 else if (ifa_scope & IFA_SITE) 4913 return RT_SCOPE_SITE; 4914 else 4915 return RT_SCOPE_UNIVERSE; 4916 } 4917 4918 static inline int inet6_ifaddr_msgsize(void) 4919 { 4920 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4921 + nla_total_size(16) /* IFA_LOCAL */ 4922 + nla_total_size(16) /* IFA_ADDRESS */ 4923 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4924 + nla_total_size(4) /* IFA_FLAGS */ 4925 + nla_total_size(4) /* IFA_RT_PRIORITY */; 4926 } 4927 4928 enum addr_type_t { 4929 UNICAST_ADDR, 4930 MULTICAST_ADDR, 4931 ANYCAST_ADDR, 4932 }; 4933 4934 struct inet6_fill_args { 4935 u32 portid; 4936 u32 seq; 4937 int event; 4938 unsigned int flags; 4939 int netnsid; 4940 int ifindex; 4941 enum addr_type_t type; 4942 }; 4943 4944 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4945 struct inet6_fill_args *args) 4946 { 4947 struct nlmsghdr *nlh; 4948 u32 preferred, valid; 4949 4950 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 4951 sizeof(struct ifaddrmsg), args->flags); 4952 if (!nlh) 4953 return -EMSGSIZE; 4954 4955 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4956 ifa->idev->dev->ifindex); 4957 4958 if (args->netnsid >= 0 && 4959 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 4960 goto error; 4961 4962 if (!((ifa->flags&IFA_F_PERMANENT) && 4963 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4964 preferred = ifa->prefered_lft; 4965 valid = ifa->valid_lft; 4966 if (preferred != INFINITY_LIFE_TIME) { 4967 long tval = (jiffies - ifa->tstamp)/HZ; 4968 if (preferred > tval) 4969 preferred -= tval; 4970 else 4971 preferred = 0; 4972 if (valid != INFINITY_LIFE_TIME) { 4973 if (valid > tval) 4974 valid -= tval; 4975 else 4976 valid = 0; 4977 } 4978 } 4979 } else { 4980 preferred = INFINITY_LIFE_TIME; 4981 valid = INFINITY_LIFE_TIME; 4982 } 4983 4984 if (!ipv6_addr_any(&ifa->peer_addr)) { 4985 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4986 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4987 goto error; 4988 } else 4989 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4990 goto error; 4991 4992 if (ifa->rt_priority && 4993 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority)) 4994 goto error; 4995 4996 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4997 goto error; 4998 4999 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 5000 goto error; 5001 5002 nlmsg_end(skb, nlh); 5003 return 0; 5004 5005 error: 5006 nlmsg_cancel(skb, nlh); 5007 return -EMSGSIZE; 5008 } 5009 5010 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 5011 struct inet6_fill_args *args) 5012 { 5013 struct nlmsghdr *nlh; 5014 u8 scope = RT_SCOPE_UNIVERSE; 5015 int ifindex = ifmca->idev->dev->ifindex; 5016 5017 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 5018 scope = RT_SCOPE_SITE; 5019 5020 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5021 sizeof(struct ifaddrmsg), args->flags); 5022 if (!nlh) 5023 return -EMSGSIZE; 5024 5025 if (args->netnsid >= 0 && 5026 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5027 nlmsg_cancel(skb, nlh); 5028 return -EMSGSIZE; 5029 } 5030 5031 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5032 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 5033 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 5034 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5035 nlmsg_cancel(skb, nlh); 5036 return -EMSGSIZE; 5037 } 5038 5039 nlmsg_end(skb, nlh); 5040 return 0; 5041 } 5042 5043 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 5044 struct inet6_fill_args *args) 5045 { 5046 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt); 5047 int ifindex = dev ? dev->ifindex : 1; 5048 struct nlmsghdr *nlh; 5049 u8 scope = RT_SCOPE_UNIVERSE; 5050 5051 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 5052 scope = RT_SCOPE_SITE; 5053 5054 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5055 sizeof(struct ifaddrmsg), args->flags); 5056 if (!nlh) 5057 return -EMSGSIZE; 5058 5059 if (args->netnsid >= 0 && 5060 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5061 nlmsg_cancel(skb, nlh); 5062 return -EMSGSIZE; 5063 } 5064 5065 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5066 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 5067 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 5068 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5069 nlmsg_cancel(skb, nlh); 5070 return -EMSGSIZE; 5071 } 5072 5073 nlmsg_end(skb, nlh); 5074 return 0; 5075 } 5076 5077 /* called with rcu_read_lock() */ 5078 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 5079 struct netlink_callback *cb, int s_ip_idx, 5080 struct inet6_fill_args *fillargs) 5081 { 5082 struct ifmcaddr6 *ifmca; 5083 struct ifacaddr6 *ifaca; 5084 int ip_idx = 0; 5085 int err = 1; 5086 5087 read_lock_bh(&idev->lock); 5088 switch (fillargs->type) { 5089 case UNICAST_ADDR: { 5090 struct inet6_ifaddr *ifa; 5091 fillargs->event = RTM_NEWADDR; 5092 5093 /* unicast address incl. temp addr */ 5094 list_for_each_entry(ifa, &idev->addr_list, if_list) { 5095 if (ip_idx < s_ip_idx) 5096 goto next; 5097 err = inet6_fill_ifaddr(skb, ifa, fillargs); 5098 if (err < 0) 5099 break; 5100 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 5101 next: 5102 ip_idx++; 5103 } 5104 break; 5105 } 5106 case MULTICAST_ADDR: 5107 fillargs->event = RTM_GETMULTICAST; 5108 5109 /* multicast address */ 5110 for (ifmca = idev->mc_list; ifmca; 5111 ifmca = ifmca->next, ip_idx++) { 5112 if (ip_idx < s_ip_idx) 5113 continue; 5114 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs); 5115 if (err < 0) 5116 break; 5117 } 5118 break; 5119 case ANYCAST_ADDR: 5120 fillargs->event = RTM_GETANYCAST; 5121 /* anycast address */ 5122 for (ifaca = idev->ac_list; ifaca; 5123 ifaca = ifaca->aca_next, ip_idx++) { 5124 if (ip_idx < s_ip_idx) 5125 continue; 5126 err = inet6_fill_ifacaddr(skb, ifaca, fillargs); 5127 if (err < 0) 5128 break; 5129 } 5130 break; 5131 default: 5132 break; 5133 } 5134 read_unlock_bh(&idev->lock); 5135 cb->args[2] = ip_idx; 5136 return err; 5137 } 5138 5139 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh, 5140 struct inet6_fill_args *fillargs, 5141 struct net **tgt_net, struct sock *sk, 5142 struct netlink_callback *cb) 5143 { 5144 struct netlink_ext_ack *extack = cb->extack; 5145 struct nlattr *tb[IFA_MAX+1]; 5146 struct ifaddrmsg *ifm; 5147 int err, i; 5148 5149 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5150 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request"); 5151 return -EINVAL; 5152 } 5153 5154 ifm = nlmsg_data(nlh); 5155 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5156 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request"); 5157 return -EINVAL; 5158 } 5159 5160 fillargs->ifindex = ifm->ifa_index; 5161 if (fillargs->ifindex) { 5162 cb->answer_flags |= NLM_F_DUMP_FILTERED; 5163 fillargs->flags |= NLM_F_DUMP_FILTERED; 5164 } 5165 5166 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5167 ifa_ipv6_policy, extack); 5168 if (err < 0) 5169 return err; 5170 5171 for (i = 0; i <= IFA_MAX; ++i) { 5172 if (!tb[i]) 5173 continue; 5174 5175 if (i == IFA_TARGET_NETNSID) { 5176 struct net *net; 5177 5178 fillargs->netnsid = nla_get_s32(tb[i]); 5179 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid); 5180 if (IS_ERR(net)) { 5181 fillargs->netnsid = -1; 5182 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id"); 5183 return PTR_ERR(net); 5184 } 5185 *tgt_net = net; 5186 } else { 5187 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); 5188 return -EINVAL; 5189 } 5190 } 5191 5192 return 0; 5193 } 5194 5195 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 5196 enum addr_type_t type) 5197 { 5198 const struct nlmsghdr *nlh = cb->nlh; 5199 struct inet6_fill_args fillargs = { 5200 .portid = NETLINK_CB(cb->skb).portid, 5201 .seq = cb->nlh->nlmsg_seq, 5202 .flags = NLM_F_MULTI, 5203 .netnsid = -1, 5204 .type = type, 5205 }; 5206 struct net *net = sock_net(skb->sk); 5207 struct net *tgt_net = net; 5208 int idx, s_idx, s_ip_idx; 5209 int h, s_h; 5210 struct net_device *dev; 5211 struct inet6_dev *idev; 5212 struct hlist_head *head; 5213 int err = 0; 5214 5215 s_h = cb->args[0]; 5216 s_idx = idx = cb->args[1]; 5217 s_ip_idx = cb->args[2]; 5218 5219 if (cb->strict_check) { 5220 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net, 5221 skb->sk, cb); 5222 if (err < 0) 5223 goto put_tgt_net; 5224 5225 err = 0; 5226 if (fillargs.ifindex) { 5227 dev = __dev_get_by_index(tgt_net, fillargs.ifindex); 5228 if (!dev) { 5229 err = -ENODEV; 5230 goto put_tgt_net; 5231 } 5232 idev = __in6_dev_get(dev); 5233 if (idev) { 5234 err = in6_dump_addrs(idev, skb, cb, s_ip_idx, 5235 &fillargs); 5236 if (err > 0) 5237 err = 0; 5238 } 5239 goto put_tgt_net; 5240 } 5241 } 5242 5243 rcu_read_lock(); 5244 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq; 5245 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5246 idx = 0; 5247 head = &tgt_net->dev_index_head[h]; 5248 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5249 if (idx < s_idx) 5250 goto cont; 5251 if (h > s_h || idx > s_idx) 5252 s_ip_idx = 0; 5253 idev = __in6_dev_get(dev); 5254 if (!idev) 5255 goto cont; 5256 5257 if (in6_dump_addrs(idev, skb, cb, s_ip_idx, 5258 &fillargs) < 0) 5259 goto done; 5260 cont: 5261 idx++; 5262 } 5263 } 5264 done: 5265 rcu_read_unlock(); 5266 cb->args[0] = h; 5267 cb->args[1] = idx; 5268 put_tgt_net: 5269 if (fillargs.netnsid >= 0) 5270 put_net(tgt_net); 5271 5272 return skb->len ? : err; 5273 } 5274 5275 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 5276 { 5277 enum addr_type_t type = UNICAST_ADDR; 5278 5279 return inet6_dump_addr(skb, cb, type); 5280 } 5281 5282 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 5283 { 5284 enum addr_type_t type = MULTICAST_ADDR; 5285 5286 return inet6_dump_addr(skb, cb, type); 5287 } 5288 5289 5290 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 5291 { 5292 enum addr_type_t type = ANYCAST_ADDR; 5293 5294 return inet6_dump_addr(skb, cb, type); 5295 } 5296 5297 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb, 5298 const struct nlmsghdr *nlh, 5299 struct nlattr **tb, 5300 struct netlink_ext_ack *extack) 5301 { 5302 struct ifaddrmsg *ifm; 5303 int i, err; 5304 5305 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5306 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request"); 5307 return -EINVAL; 5308 } 5309 5310 if (!netlink_strict_get_check(skb)) 5311 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 5312 ifa_ipv6_policy, extack); 5313 5314 ifm = nlmsg_data(nlh); 5315 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5316 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request"); 5317 return -EINVAL; 5318 } 5319 5320 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5321 ifa_ipv6_policy, extack); 5322 if (err) 5323 return err; 5324 5325 for (i = 0; i <= IFA_MAX; i++) { 5326 if (!tb[i]) 5327 continue; 5328 5329 switch (i) { 5330 case IFA_TARGET_NETNSID: 5331 case IFA_ADDRESS: 5332 case IFA_LOCAL: 5333 break; 5334 default: 5335 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request"); 5336 return -EINVAL; 5337 } 5338 } 5339 5340 return 0; 5341 } 5342 5343 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 5344 struct netlink_ext_ack *extack) 5345 { 5346 struct net *net = sock_net(in_skb->sk); 5347 struct inet6_fill_args fillargs = { 5348 .portid = NETLINK_CB(in_skb).portid, 5349 .seq = nlh->nlmsg_seq, 5350 .event = RTM_NEWADDR, 5351 .flags = 0, 5352 .netnsid = -1, 5353 }; 5354 struct net *tgt_net = net; 5355 struct ifaddrmsg *ifm; 5356 struct nlattr *tb[IFA_MAX+1]; 5357 struct in6_addr *addr = NULL, *peer; 5358 struct net_device *dev = NULL; 5359 struct inet6_ifaddr *ifa; 5360 struct sk_buff *skb; 5361 int err; 5362 5363 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack); 5364 if (err < 0) 5365 return err; 5366 5367 if (tb[IFA_TARGET_NETNSID]) { 5368 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]); 5369 5370 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk, 5371 fillargs.netnsid); 5372 if (IS_ERR(tgt_net)) 5373 return PTR_ERR(tgt_net); 5374 } 5375 5376 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 5377 if (!addr) 5378 return -EINVAL; 5379 5380 ifm = nlmsg_data(nlh); 5381 if (ifm->ifa_index) 5382 dev = dev_get_by_index(tgt_net, ifm->ifa_index); 5383 5384 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1); 5385 if (!ifa) { 5386 err = -EADDRNOTAVAIL; 5387 goto errout; 5388 } 5389 5390 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 5391 if (!skb) { 5392 err = -ENOBUFS; 5393 goto errout_ifa; 5394 } 5395 5396 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5397 if (err < 0) { 5398 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5399 WARN_ON(err == -EMSGSIZE); 5400 kfree_skb(skb); 5401 goto errout_ifa; 5402 } 5403 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid); 5404 errout_ifa: 5405 in6_ifa_put(ifa); 5406 errout: 5407 if (dev) 5408 dev_put(dev); 5409 if (fillargs.netnsid >= 0) 5410 put_net(tgt_net); 5411 5412 return err; 5413 } 5414 5415 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 5416 { 5417 struct sk_buff *skb; 5418 struct net *net = dev_net(ifa->idev->dev); 5419 struct inet6_fill_args fillargs = { 5420 .portid = 0, 5421 .seq = 0, 5422 .event = event, 5423 .flags = 0, 5424 .netnsid = -1, 5425 }; 5426 int err = -ENOBUFS; 5427 5428 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 5429 if (!skb) 5430 goto errout; 5431 5432 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5433 if (err < 0) { 5434 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5435 WARN_ON(err == -EMSGSIZE); 5436 kfree_skb(skb); 5437 goto errout; 5438 } 5439 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 5440 return; 5441 errout: 5442 if (err < 0) 5443 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 5444 } 5445 5446 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 5447 __s32 *array, int bytes) 5448 { 5449 BUG_ON(bytes < (DEVCONF_MAX * 4)); 5450 5451 memset(array, 0, bytes); 5452 array[DEVCONF_FORWARDING] = cnf->forwarding; 5453 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 5454 array[DEVCONF_MTU6] = cnf->mtu6; 5455 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 5456 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 5457 array[DEVCONF_AUTOCONF] = cnf->autoconf; 5458 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 5459 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 5460 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5461 jiffies_to_msecs(cnf->rtr_solicit_interval); 5462 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5463 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 5464 array[DEVCONF_RTR_SOLICIT_DELAY] = 5465 jiffies_to_msecs(cnf->rtr_solicit_delay); 5466 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 5467 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5468 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 5469 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5470 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 5471 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 5472 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 5473 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 5474 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 5475 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 5476 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 5477 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 5478 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 5479 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 5480 #ifdef CONFIG_IPV6_ROUTER_PREF 5481 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 5482 array[DEVCONF_RTR_PROBE_INTERVAL] = 5483 jiffies_to_msecs(cnf->rtr_probe_interval); 5484 #ifdef CONFIG_IPV6_ROUTE_INFO 5485 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen; 5486 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 5487 #endif 5488 #endif 5489 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 5490 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 5491 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5492 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 5493 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 5494 #endif 5495 #ifdef CONFIG_IPV6_MROUTE 5496 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 5497 #endif 5498 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 5499 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 5500 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 5501 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 5502 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 5503 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 5504 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 5505 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 5506 /* we omit DEVCONF_STABLE_SECRET for now */ 5507 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 5508 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 5509 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 5510 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5511 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5512 #ifdef CONFIG_IPV6_SEG6_HMAC 5513 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5514 #endif 5515 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5516 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5517 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy; 5518 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass; 5519 array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled; 5520 } 5521 5522 static inline size_t inet6_ifla6_size(void) 5523 { 5524 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5525 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5526 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5527 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5528 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5529 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */ 5530 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */ 5531 + 0; 5532 } 5533 5534 static inline size_t inet6_if_nlmsg_size(void) 5535 { 5536 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5537 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5538 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5539 + nla_total_size(4) /* IFLA_MTU */ 5540 + nla_total_size(4) /* IFLA_LINK */ 5541 + nla_total_size(1) /* IFLA_OPERSTATE */ 5542 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5543 } 5544 5545 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5546 int bytes) 5547 { 5548 int i; 5549 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5550 BUG_ON(pad < 0); 5551 5552 /* Use put_unaligned() because stats may not be aligned for u64. */ 5553 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5554 for (i = 1; i < ICMP6_MIB_MAX; i++) 5555 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5556 5557 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5558 } 5559 5560 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5561 int bytes, size_t syncpoff) 5562 { 5563 int i, c; 5564 u64 buff[IPSTATS_MIB_MAX]; 5565 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5566 5567 BUG_ON(pad < 0); 5568 5569 memset(buff, 0, sizeof(buff)); 5570 buff[0] = IPSTATS_MIB_MAX; 5571 5572 for_each_possible_cpu(c) { 5573 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5574 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5575 } 5576 5577 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5578 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5579 } 5580 5581 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5582 int bytes) 5583 { 5584 switch (attrtype) { 5585 case IFLA_INET6_STATS: 5586 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5587 offsetof(struct ipstats_mib, syncp)); 5588 break; 5589 case IFLA_INET6_ICMP6STATS: 5590 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5591 break; 5592 } 5593 } 5594 5595 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5596 u32 ext_filter_mask) 5597 { 5598 struct nlattr *nla; 5599 struct ifla_cacheinfo ci; 5600 5601 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5602 goto nla_put_failure; 5603 ci.max_reasm_len = IPV6_MAXPLEN; 5604 ci.tstamp = cstamp_delta(idev->tstamp); 5605 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5606 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5607 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5608 goto nla_put_failure; 5609 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5610 if (!nla) 5611 goto nla_put_failure; 5612 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5613 5614 /* XXX - MC not implemented */ 5615 5616 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5617 return 0; 5618 5619 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5620 if (!nla) 5621 goto nla_put_failure; 5622 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5623 5624 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5625 if (!nla) 5626 goto nla_put_failure; 5627 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5628 5629 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5630 if (!nla) 5631 goto nla_put_failure; 5632 read_lock_bh(&idev->lock); 5633 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5634 read_unlock_bh(&idev->lock); 5635 5636 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5637 goto nla_put_failure; 5638 5639 return 0; 5640 5641 nla_put_failure: 5642 return -EMSGSIZE; 5643 } 5644 5645 static size_t inet6_get_link_af_size(const struct net_device *dev, 5646 u32 ext_filter_mask) 5647 { 5648 if (!__in6_dev_get(dev)) 5649 return 0; 5650 5651 return inet6_ifla6_size(); 5652 } 5653 5654 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5655 u32 ext_filter_mask) 5656 { 5657 struct inet6_dev *idev = __in6_dev_get(dev); 5658 5659 if (!idev) 5660 return -ENODATA; 5661 5662 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5663 return -EMSGSIZE; 5664 5665 return 0; 5666 } 5667 5668 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 5669 { 5670 struct inet6_ifaddr *ifp; 5671 struct net_device *dev = idev->dev; 5672 bool clear_token, update_rs = false; 5673 struct in6_addr ll_addr; 5674 5675 ASSERT_RTNL(); 5676 5677 if (!token) 5678 return -EINVAL; 5679 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 5680 return -EINVAL; 5681 if (!ipv6_accept_ra(idev)) 5682 return -EINVAL; 5683 if (idev->cnf.rtr_solicits == 0) 5684 return -EINVAL; 5685 5686 write_lock_bh(&idev->lock); 5687 5688 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5689 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5690 5691 write_unlock_bh(&idev->lock); 5692 5693 clear_token = ipv6_addr_any(token); 5694 if (clear_token) 5695 goto update_lft; 5696 5697 if (!idev->dead && (idev->if_flags & IF_READY) && 5698 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5699 IFA_F_OPTIMISTIC)) { 5700 /* If we're not ready, then normal ifup will take care 5701 * of this. Otherwise, we need to request our rs here. 5702 */ 5703 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5704 update_rs = true; 5705 } 5706 5707 update_lft: 5708 write_lock_bh(&idev->lock); 5709 5710 if (update_rs) { 5711 idev->if_flags |= IF_RS_SENT; 5712 idev->rs_interval = rfc3315_s14_backoff_init( 5713 idev->cnf.rtr_solicit_interval); 5714 idev->rs_probes = 1; 5715 addrconf_mod_rs_timer(idev, idev->rs_interval); 5716 } 5717 5718 /* Well, that's kinda nasty ... */ 5719 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5720 spin_lock(&ifp->lock); 5721 if (ifp->tokenized) { 5722 ifp->valid_lft = 0; 5723 ifp->prefered_lft = 0; 5724 } 5725 spin_unlock(&ifp->lock); 5726 } 5727 5728 write_unlock_bh(&idev->lock); 5729 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5730 addrconf_verify_rtnl(); 5731 return 0; 5732 } 5733 5734 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5735 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5736 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5737 }; 5738 5739 static int check_addr_gen_mode(int mode) 5740 { 5741 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5742 mode != IN6_ADDR_GEN_MODE_NONE && 5743 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5744 mode != IN6_ADDR_GEN_MODE_RANDOM) 5745 return -EINVAL; 5746 return 1; 5747 } 5748 5749 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5750 int mode) 5751 { 5752 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5753 !idev->cnf.stable_secret.initialized && 5754 !net->ipv6.devconf_dflt->stable_secret.initialized) 5755 return -EINVAL; 5756 return 1; 5757 } 5758 5759 static int inet6_validate_link_af(const struct net_device *dev, 5760 const struct nlattr *nla) 5761 { 5762 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5763 struct inet6_dev *idev = NULL; 5764 int err; 5765 5766 if (dev) { 5767 idev = __in6_dev_get(dev); 5768 if (!idev) 5769 return -EAFNOSUPPORT; 5770 } 5771 5772 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, 5773 inet6_af_policy, NULL); 5774 if (err) 5775 return err; 5776 5777 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE]) 5778 return -EINVAL; 5779 5780 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5781 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5782 5783 if (check_addr_gen_mode(mode) < 0) 5784 return -EINVAL; 5785 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0) 5786 return -EINVAL; 5787 } 5788 5789 return 0; 5790 } 5791 5792 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 5793 { 5794 struct inet6_dev *idev = __in6_dev_get(dev); 5795 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5796 int err; 5797 5798 if (!idev) 5799 return -EAFNOSUPPORT; 5800 5801 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 5802 BUG(); 5803 5804 if (tb[IFLA_INET6_TOKEN]) { 5805 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 5806 if (err) 5807 return err; 5808 } 5809 5810 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5811 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5812 5813 idev->cnf.addr_gen_mode = mode; 5814 } 5815 5816 return 0; 5817 } 5818 5819 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5820 u32 portid, u32 seq, int event, unsigned int flags) 5821 { 5822 struct net_device *dev = idev->dev; 5823 struct ifinfomsg *hdr; 5824 struct nlmsghdr *nlh; 5825 void *protoinfo; 5826 5827 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5828 if (!nlh) 5829 return -EMSGSIZE; 5830 5831 hdr = nlmsg_data(nlh); 5832 hdr->ifi_family = AF_INET6; 5833 hdr->__ifi_pad = 0; 5834 hdr->ifi_type = dev->type; 5835 hdr->ifi_index = dev->ifindex; 5836 hdr->ifi_flags = dev_get_flags(dev); 5837 hdr->ifi_change = 0; 5838 5839 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5840 (dev->addr_len && 5841 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5842 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5843 (dev->ifindex != dev_get_iflink(dev) && 5844 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5845 nla_put_u8(skb, IFLA_OPERSTATE, 5846 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5847 goto nla_put_failure; 5848 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO); 5849 if (!protoinfo) 5850 goto nla_put_failure; 5851 5852 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5853 goto nla_put_failure; 5854 5855 nla_nest_end(skb, protoinfo); 5856 nlmsg_end(skb, nlh); 5857 return 0; 5858 5859 nla_put_failure: 5860 nlmsg_cancel(skb, nlh); 5861 return -EMSGSIZE; 5862 } 5863 5864 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh, 5865 struct netlink_ext_ack *extack) 5866 { 5867 struct ifinfomsg *ifm; 5868 5869 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5870 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request"); 5871 return -EINVAL; 5872 } 5873 5874 if (nlmsg_attrlen(nlh, sizeof(*ifm))) { 5875 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header"); 5876 return -EINVAL; 5877 } 5878 5879 ifm = nlmsg_data(nlh); 5880 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || 5881 ifm->ifi_change || ifm->ifi_index) { 5882 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request"); 5883 return -EINVAL; 5884 } 5885 5886 return 0; 5887 } 5888 5889 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5890 { 5891 struct net *net = sock_net(skb->sk); 5892 int h, s_h; 5893 int idx = 0, s_idx; 5894 struct net_device *dev; 5895 struct inet6_dev *idev; 5896 struct hlist_head *head; 5897 5898 /* only requests using strict checking can pass data to 5899 * influence the dump 5900 */ 5901 if (cb->strict_check) { 5902 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack); 5903 5904 if (err < 0) 5905 return err; 5906 } 5907 5908 s_h = cb->args[0]; 5909 s_idx = cb->args[1]; 5910 5911 rcu_read_lock(); 5912 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5913 idx = 0; 5914 head = &net->dev_index_head[h]; 5915 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5916 if (idx < s_idx) 5917 goto cont; 5918 idev = __in6_dev_get(dev); 5919 if (!idev) 5920 goto cont; 5921 if (inet6_fill_ifinfo(skb, idev, 5922 NETLINK_CB(cb->skb).portid, 5923 cb->nlh->nlmsg_seq, 5924 RTM_NEWLINK, NLM_F_MULTI) < 0) 5925 goto out; 5926 cont: 5927 idx++; 5928 } 5929 } 5930 out: 5931 rcu_read_unlock(); 5932 cb->args[1] = idx; 5933 cb->args[0] = h; 5934 5935 return skb->len; 5936 } 5937 5938 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5939 { 5940 struct sk_buff *skb; 5941 struct net *net = dev_net(idev->dev); 5942 int err = -ENOBUFS; 5943 5944 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5945 if (!skb) 5946 goto errout; 5947 5948 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5949 if (err < 0) { 5950 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5951 WARN_ON(err == -EMSGSIZE); 5952 kfree_skb(skb); 5953 goto errout; 5954 } 5955 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5956 return; 5957 errout: 5958 if (err < 0) 5959 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5960 } 5961 5962 static inline size_t inet6_prefix_nlmsg_size(void) 5963 { 5964 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5965 + nla_total_size(sizeof(struct in6_addr)) 5966 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5967 } 5968 5969 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5970 struct prefix_info *pinfo, u32 portid, u32 seq, 5971 int event, unsigned int flags) 5972 { 5973 struct prefixmsg *pmsg; 5974 struct nlmsghdr *nlh; 5975 struct prefix_cacheinfo ci; 5976 5977 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5978 if (!nlh) 5979 return -EMSGSIZE; 5980 5981 pmsg = nlmsg_data(nlh); 5982 pmsg->prefix_family = AF_INET6; 5983 pmsg->prefix_pad1 = 0; 5984 pmsg->prefix_pad2 = 0; 5985 pmsg->prefix_ifindex = idev->dev->ifindex; 5986 pmsg->prefix_len = pinfo->prefix_len; 5987 pmsg->prefix_type = pinfo->type; 5988 pmsg->prefix_pad3 = 0; 5989 pmsg->prefix_flags = 0; 5990 if (pinfo->onlink) 5991 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 5992 if (pinfo->autoconf) 5993 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 5994 5995 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5996 goto nla_put_failure; 5997 ci.preferred_time = ntohl(pinfo->prefered); 5998 ci.valid_time = ntohl(pinfo->valid); 5999 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 6000 goto nla_put_failure; 6001 nlmsg_end(skb, nlh); 6002 return 0; 6003 6004 nla_put_failure: 6005 nlmsg_cancel(skb, nlh); 6006 return -EMSGSIZE; 6007 } 6008 6009 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 6010 struct prefix_info *pinfo) 6011 { 6012 struct sk_buff *skb; 6013 struct net *net = dev_net(idev->dev); 6014 int err = -ENOBUFS; 6015 6016 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 6017 if (!skb) 6018 goto errout; 6019 6020 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 6021 if (err < 0) { 6022 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 6023 WARN_ON(err == -EMSGSIZE); 6024 kfree_skb(skb); 6025 goto errout; 6026 } 6027 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 6028 return; 6029 errout: 6030 if (err < 0) 6031 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 6032 } 6033 6034 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6035 { 6036 struct net *net = dev_net(ifp->idev->dev); 6037 6038 if (event) 6039 ASSERT_RTNL(); 6040 6041 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 6042 6043 switch (event) { 6044 case RTM_NEWADDR: 6045 /* 6046 * If the address was optimistic we inserted the route at the 6047 * start of our DAD process, so we don't need to do it again. 6048 * If the device was taken down in the middle of the DAD 6049 * cycle there is a race where we could get here without a 6050 * host route, so nothing to insert. That will be fixed when 6051 * the device is brought up. 6052 */ 6053 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) { 6054 ip6_ins_rt(net, ifp->rt); 6055 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) { 6056 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n", 6057 &ifp->addr, ifp->idev->dev->name); 6058 } 6059 6060 if (ifp->idev->cnf.forwarding) 6061 addrconf_join_anycast(ifp); 6062 if (!ipv6_addr_any(&ifp->peer_addr)) 6063 addrconf_prefix_route(&ifp->peer_addr, 128, 6064 ifp->rt_priority, ifp->idev->dev, 6065 0, 0, GFP_ATOMIC); 6066 break; 6067 case RTM_DELADDR: 6068 if (ifp->idev->cnf.forwarding) 6069 addrconf_leave_anycast(ifp); 6070 addrconf_leave_solict(ifp->idev, &ifp->addr); 6071 if (!ipv6_addr_any(&ifp->peer_addr)) { 6072 struct fib6_info *rt; 6073 6074 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 6075 ifp->idev->dev, 0, 0, 6076 false); 6077 if (rt) 6078 ip6_del_rt(net, rt, false); 6079 } 6080 if (ifp->rt) { 6081 ip6_del_rt(net, ifp->rt, false); 6082 ifp->rt = NULL; 6083 } 6084 rt_genid_bump_ipv6(net); 6085 break; 6086 } 6087 atomic_inc(&net->ipv6.dev_addr_genid); 6088 } 6089 6090 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6091 { 6092 rcu_read_lock_bh(); 6093 if (likely(ifp->idev->dead == 0)) 6094 __ipv6_ifa_notify(event, ifp); 6095 rcu_read_unlock_bh(); 6096 } 6097 6098 #ifdef CONFIG_SYSCTL 6099 6100 static int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 6101 void *buffer, size_t *lenp, loff_t *ppos) 6102 { 6103 int *valp = ctl->data; 6104 int val = *valp; 6105 loff_t pos = *ppos; 6106 struct ctl_table lctl; 6107 int ret; 6108 6109 /* 6110 * ctl->data points to idev->cnf.forwarding, we should 6111 * not modify it until we get the rtnl lock. 6112 */ 6113 lctl = *ctl; 6114 lctl.data = &val; 6115 6116 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6117 6118 if (write) 6119 ret = addrconf_fixup_forwarding(ctl, valp, val); 6120 if (ret) 6121 *ppos = pos; 6122 return ret; 6123 } 6124 6125 static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 6126 void *buffer, size_t *lenp, loff_t *ppos) 6127 { 6128 struct inet6_dev *idev = ctl->extra1; 6129 int min_mtu = IPV6_MIN_MTU; 6130 struct ctl_table lctl; 6131 6132 lctl = *ctl; 6133 lctl.extra1 = &min_mtu; 6134 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 6135 6136 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 6137 } 6138 6139 static void dev_disable_change(struct inet6_dev *idev) 6140 { 6141 struct netdev_notifier_info info; 6142 6143 if (!idev || !idev->dev) 6144 return; 6145 6146 netdev_notifier_info_init(&info, idev->dev); 6147 if (idev->cnf.disable_ipv6) 6148 addrconf_notify(NULL, NETDEV_DOWN, &info); 6149 else 6150 addrconf_notify(NULL, NETDEV_UP, &info); 6151 } 6152 6153 static void addrconf_disable_change(struct net *net, __s32 newf) 6154 { 6155 struct net_device *dev; 6156 struct inet6_dev *idev; 6157 6158 for_each_netdev(net, dev) { 6159 idev = __in6_dev_get(dev); 6160 if (idev) { 6161 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 6162 idev->cnf.disable_ipv6 = newf; 6163 if (changed) 6164 dev_disable_change(idev); 6165 } 6166 } 6167 } 6168 6169 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 6170 { 6171 struct net *net; 6172 int old; 6173 6174 if (!rtnl_trylock()) 6175 return restart_syscall(); 6176 6177 net = (struct net *)table->extra2; 6178 old = *p; 6179 *p = newf; 6180 6181 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 6182 rtnl_unlock(); 6183 return 0; 6184 } 6185 6186 if (p == &net->ipv6.devconf_all->disable_ipv6) { 6187 net->ipv6.devconf_dflt->disable_ipv6 = newf; 6188 addrconf_disable_change(net, newf); 6189 } else if ((!newf) ^ (!old)) 6190 dev_disable_change((struct inet6_dev *)table->extra1); 6191 6192 rtnl_unlock(); 6193 return 0; 6194 } 6195 6196 static int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 6197 void *buffer, size_t *lenp, loff_t *ppos) 6198 { 6199 int *valp = ctl->data; 6200 int val = *valp; 6201 loff_t pos = *ppos; 6202 struct ctl_table lctl; 6203 int ret; 6204 6205 /* 6206 * ctl->data points to idev->cnf.disable_ipv6, we should 6207 * not modify it until we get the rtnl lock. 6208 */ 6209 lctl = *ctl; 6210 lctl.data = &val; 6211 6212 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6213 6214 if (write) 6215 ret = addrconf_disable_ipv6(ctl, valp, val); 6216 if (ret) 6217 *ppos = pos; 6218 return ret; 6219 } 6220 6221 static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 6222 void *buffer, size_t *lenp, loff_t *ppos) 6223 { 6224 int *valp = ctl->data; 6225 int ret; 6226 int old, new; 6227 6228 old = *valp; 6229 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 6230 new = *valp; 6231 6232 if (write && old != new) { 6233 struct net *net = ctl->extra2; 6234 6235 if (!rtnl_trylock()) 6236 return restart_syscall(); 6237 6238 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 6239 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6240 NETCONFA_PROXY_NEIGH, 6241 NETCONFA_IFINDEX_DEFAULT, 6242 net->ipv6.devconf_dflt); 6243 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 6244 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6245 NETCONFA_PROXY_NEIGH, 6246 NETCONFA_IFINDEX_ALL, 6247 net->ipv6.devconf_all); 6248 else { 6249 struct inet6_dev *idev = ctl->extra1; 6250 6251 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6252 NETCONFA_PROXY_NEIGH, 6253 idev->dev->ifindex, 6254 &idev->cnf); 6255 } 6256 rtnl_unlock(); 6257 } 6258 6259 return ret; 6260 } 6261 6262 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 6263 void *buffer, size_t *lenp, 6264 loff_t *ppos) 6265 { 6266 int ret = 0; 6267 u32 new_val; 6268 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 6269 struct net *net = (struct net *)ctl->extra2; 6270 struct ctl_table tmp = { 6271 .data = &new_val, 6272 .maxlen = sizeof(new_val), 6273 .mode = ctl->mode, 6274 }; 6275 6276 if (!rtnl_trylock()) 6277 return restart_syscall(); 6278 6279 new_val = *((u32 *)ctl->data); 6280 6281 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos); 6282 if (ret != 0) 6283 goto out; 6284 6285 if (write) { 6286 if (check_addr_gen_mode(new_val) < 0) { 6287 ret = -EINVAL; 6288 goto out; 6289 } 6290 6291 if (idev) { 6292 if (check_stable_privacy(idev, net, new_val) < 0) { 6293 ret = -EINVAL; 6294 goto out; 6295 } 6296 6297 if (idev->cnf.addr_gen_mode != new_val) { 6298 idev->cnf.addr_gen_mode = new_val; 6299 addrconf_dev_config(idev->dev); 6300 } 6301 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) { 6302 struct net_device *dev; 6303 6304 net->ipv6.devconf_dflt->addr_gen_mode = new_val; 6305 for_each_netdev(net, dev) { 6306 idev = __in6_dev_get(dev); 6307 if (idev && 6308 idev->cnf.addr_gen_mode != new_val) { 6309 idev->cnf.addr_gen_mode = new_val; 6310 addrconf_dev_config(idev->dev); 6311 } 6312 } 6313 } 6314 6315 *((u32 *)ctl->data) = new_val; 6316 } 6317 6318 out: 6319 rtnl_unlock(); 6320 6321 return ret; 6322 } 6323 6324 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 6325 void *buffer, size_t *lenp, 6326 loff_t *ppos) 6327 { 6328 int err; 6329 struct in6_addr addr; 6330 char str[IPV6_MAX_STRLEN]; 6331 struct ctl_table lctl = *ctl; 6332 struct net *net = ctl->extra2; 6333 struct ipv6_stable_secret *secret = ctl->data; 6334 6335 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 6336 return -EIO; 6337 6338 lctl.maxlen = IPV6_MAX_STRLEN; 6339 lctl.data = str; 6340 6341 if (!rtnl_trylock()) 6342 return restart_syscall(); 6343 6344 if (!write && !secret->initialized) { 6345 err = -EIO; 6346 goto out; 6347 } 6348 6349 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 6350 if (err >= sizeof(str)) { 6351 err = -EIO; 6352 goto out; 6353 } 6354 6355 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 6356 if (err || !write) 6357 goto out; 6358 6359 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 6360 err = -EIO; 6361 goto out; 6362 } 6363 6364 secret->initialized = true; 6365 secret->secret = addr; 6366 6367 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 6368 struct net_device *dev; 6369 6370 for_each_netdev(net, dev) { 6371 struct inet6_dev *idev = __in6_dev_get(dev); 6372 6373 if (idev) { 6374 idev->cnf.addr_gen_mode = 6375 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6376 } 6377 } 6378 } else { 6379 struct inet6_dev *idev = ctl->extra1; 6380 6381 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6382 } 6383 6384 out: 6385 rtnl_unlock(); 6386 6387 return err; 6388 } 6389 6390 static 6391 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 6392 int write, void *buffer, 6393 size_t *lenp, 6394 loff_t *ppos) 6395 { 6396 int *valp = ctl->data; 6397 int val = *valp; 6398 loff_t pos = *ppos; 6399 struct ctl_table lctl; 6400 int ret; 6401 6402 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 6403 * we should not modify it until we get the rtnl lock. 6404 */ 6405 lctl = *ctl; 6406 lctl.data = &val; 6407 6408 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6409 6410 if (write) 6411 ret = addrconf_fixup_linkdown(ctl, valp, val); 6412 if (ret) 6413 *ppos = pos; 6414 return ret; 6415 } 6416 6417 static 6418 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 6419 { 6420 if (rt) { 6421 if (action) 6422 rt->dst.flags |= DST_NOPOLICY; 6423 else 6424 rt->dst.flags &= ~DST_NOPOLICY; 6425 } 6426 } 6427 6428 static 6429 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 6430 { 6431 struct inet6_ifaddr *ifa; 6432 6433 read_lock_bh(&idev->lock); 6434 list_for_each_entry(ifa, &idev->addr_list, if_list) { 6435 spin_lock(&ifa->lock); 6436 if (ifa->rt) { 6437 /* host routes only use builtin fib6_nh */ 6438 struct fib6_nh *nh = ifa->rt->fib6_nh; 6439 int cpu; 6440 6441 rcu_read_lock(); 6442 ifa->rt->dst_nopolicy = val ? true : false; 6443 if (nh->rt6i_pcpu) { 6444 for_each_possible_cpu(cpu) { 6445 struct rt6_info **rtp; 6446 6447 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu); 6448 addrconf_set_nopolicy(*rtp, val); 6449 } 6450 } 6451 rcu_read_unlock(); 6452 } 6453 spin_unlock(&ifa->lock); 6454 } 6455 read_unlock_bh(&idev->lock); 6456 } 6457 6458 static 6459 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 6460 { 6461 struct inet6_dev *idev; 6462 struct net *net; 6463 6464 if (!rtnl_trylock()) 6465 return restart_syscall(); 6466 6467 *valp = val; 6468 6469 net = (struct net *)ctl->extra2; 6470 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 6471 rtnl_unlock(); 6472 return 0; 6473 } 6474 6475 if (valp == &net->ipv6.devconf_all->disable_policy) { 6476 struct net_device *dev; 6477 6478 for_each_netdev(net, dev) { 6479 idev = __in6_dev_get(dev); 6480 if (idev) 6481 addrconf_disable_policy_idev(idev, val); 6482 } 6483 } else { 6484 idev = (struct inet6_dev *)ctl->extra1; 6485 addrconf_disable_policy_idev(idev, val); 6486 } 6487 6488 rtnl_unlock(); 6489 return 0; 6490 } 6491 6492 static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 6493 void *buffer, size_t *lenp, loff_t *ppos) 6494 { 6495 int *valp = ctl->data; 6496 int val = *valp; 6497 loff_t pos = *ppos; 6498 struct ctl_table lctl; 6499 int ret; 6500 6501 lctl = *ctl; 6502 lctl.data = &val; 6503 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6504 6505 if (write && (*valp != val)) 6506 ret = addrconf_disable_policy(ctl, valp, val); 6507 6508 if (ret) 6509 *ppos = pos; 6510 6511 return ret; 6512 } 6513 6514 static int minus_one = -1; 6515 static const int two_five_five = 255; 6516 6517 static const struct ctl_table addrconf_sysctl[] = { 6518 { 6519 .procname = "forwarding", 6520 .data = &ipv6_devconf.forwarding, 6521 .maxlen = sizeof(int), 6522 .mode = 0644, 6523 .proc_handler = addrconf_sysctl_forward, 6524 }, 6525 { 6526 .procname = "hop_limit", 6527 .data = &ipv6_devconf.hop_limit, 6528 .maxlen = sizeof(int), 6529 .mode = 0644, 6530 .proc_handler = proc_dointvec_minmax, 6531 .extra1 = (void *)SYSCTL_ONE, 6532 .extra2 = (void *)&two_five_five, 6533 }, 6534 { 6535 .procname = "mtu", 6536 .data = &ipv6_devconf.mtu6, 6537 .maxlen = sizeof(int), 6538 .mode = 0644, 6539 .proc_handler = addrconf_sysctl_mtu, 6540 }, 6541 { 6542 .procname = "accept_ra", 6543 .data = &ipv6_devconf.accept_ra, 6544 .maxlen = sizeof(int), 6545 .mode = 0644, 6546 .proc_handler = proc_dointvec, 6547 }, 6548 { 6549 .procname = "accept_redirects", 6550 .data = &ipv6_devconf.accept_redirects, 6551 .maxlen = sizeof(int), 6552 .mode = 0644, 6553 .proc_handler = proc_dointvec, 6554 }, 6555 { 6556 .procname = "autoconf", 6557 .data = &ipv6_devconf.autoconf, 6558 .maxlen = sizeof(int), 6559 .mode = 0644, 6560 .proc_handler = proc_dointvec, 6561 }, 6562 { 6563 .procname = "dad_transmits", 6564 .data = &ipv6_devconf.dad_transmits, 6565 .maxlen = sizeof(int), 6566 .mode = 0644, 6567 .proc_handler = proc_dointvec, 6568 }, 6569 { 6570 .procname = "router_solicitations", 6571 .data = &ipv6_devconf.rtr_solicits, 6572 .maxlen = sizeof(int), 6573 .mode = 0644, 6574 .proc_handler = proc_dointvec_minmax, 6575 .extra1 = &minus_one, 6576 }, 6577 { 6578 .procname = "router_solicitation_interval", 6579 .data = &ipv6_devconf.rtr_solicit_interval, 6580 .maxlen = sizeof(int), 6581 .mode = 0644, 6582 .proc_handler = proc_dointvec_jiffies, 6583 }, 6584 { 6585 .procname = "router_solicitation_max_interval", 6586 .data = &ipv6_devconf.rtr_solicit_max_interval, 6587 .maxlen = sizeof(int), 6588 .mode = 0644, 6589 .proc_handler = proc_dointvec_jiffies, 6590 }, 6591 { 6592 .procname = "router_solicitation_delay", 6593 .data = &ipv6_devconf.rtr_solicit_delay, 6594 .maxlen = sizeof(int), 6595 .mode = 0644, 6596 .proc_handler = proc_dointvec_jiffies, 6597 }, 6598 { 6599 .procname = "force_mld_version", 6600 .data = &ipv6_devconf.force_mld_version, 6601 .maxlen = sizeof(int), 6602 .mode = 0644, 6603 .proc_handler = proc_dointvec, 6604 }, 6605 { 6606 .procname = "mldv1_unsolicited_report_interval", 6607 .data = 6608 &ipv6_devconf.mldv1_unsolicited_report_interval, 6609 .maxlen = sizeof(int), 6610 .mode = 0644, 6611 .proc_handler = proc_dointvec_ms_jiffies, 6612 }, 6613 { 6614 .procname = "mldv2_unsolicited_report_interval", 6615 .data = 6616 &ipv6_devconf.mldv2_unsolicited_report_interval, 6617 .maxlen = sizeof(int), 6618 .mode = 0644, 6619 .proc_handler = proc_dointvec_ms_jiffies, 6620 }, 6621 { 6622 .procname = "use_tempaddr", 6623 .data = &ipv6_devconf.use_tempaddr, 6624 .maxlen = sizeof(int), 6625 .mode = 0644, 6626 .proc_handler = proc_dointvec, 6627 }, 6628 { 6629 .procname = "temp_valid_lft", 6630 .data = &ipv6_devconf.temp_valid_lft, 6631 .maxlen = sizeof(int), 6632 .mode = 0644, 6633 .proc_handler = proc_dointvec, 6634 }, 6635 { 6636 .procname = "temp_prefered_lft", 6637 .data = &ipv6_devconf.temp_prefered_lft, 6638 .maxlen = sizeof(int), 6639 .mode = 0644, 6640 .proc_handler = proc_dointvec, 6641 }, 6642 { 6643 .procname = "regen_max_retry", 6644 .data = &ipv6_devconf.regen_max_retry, 6645 .maxlen = sizeof(int), 6646 .mode = 0644, 6647 .proc_handler = proc_dointvec, 6648 }, 6649 { 6650 .procname = "max_desync_factor", 6651 .data = &ipv6_devconf.max_desync_factor, 6652 .maxlen = sizeof(int), 6653 .mode = 0644, 6654 .proc_handler = proc_dointvec, 6655 }, 6656 { 6657 .procname = "max_addresses", 6658 .data = &ipv6_devconf.max_addresses, 6659 .maxlen = sizeof(int), 6660 .mode = 0644, 6661 .proc_handler = proc_dointvec, 6662 }, 6663 { 6664 .procname = "accept_ra_defrtr", 6665 .data = &ipv6_devconf.accept_ra_defrtr, 6666 .maxlen = sizeof(int), 6667 .mode = 0644, 6668 .proc_handler = proc_dointvec, 6669 }, 6670 { 6671 .procname = "accept_ra_min_hop_limit", 6672 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6673 .maxlen = sizeof(int), 6674 .mode = 0644, 6675 .proc_handler = proc_dointvec, 6676 }, 6677 { 6678 .procname = "accept_ra_pinfo", 6679 .data = &ipv6_devconf.accept_ra_pinfo, 6680 .maxlen = sizeof(int), 6681 .mode = 0644, 6682 .proc_handler = proc_dointvec, 6683 }, 6684 #ifdef CONFIG_IPV6_ROUTER_PREF 6685 { 6686 .procname = "accept_ra_rtr_pref", 6687 .data = &ipv6_devconf.accept_ra_rtr_pref, 6688 .maxlen = sizeof(int), 6689 .mode = 0644, 6690 .proc_handler = proc_dointvec, 6691 }, 6692 { 6693 .procname = "router_probe_interval", 6694 .data = &ipv6_devconf.rtr_probe_interval, 6695 .maxlen = sizeof(int), 6696 .mode = 0644, 6697 .proc_handler = proc_dointvec_jiffies, 6698 }, 6699 #ifdef CONFIG_IPV6_ROUTE_INFO 6700 { 6701 .procname = "accept_ra_rt_info_min_plen", 6702 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6703 .maxlen = sizeof(int), 6704 .mode = 0644, 6705 .proc_handler = proc_dointvec, 6706 }, 6707 { 6708 .procname = "accept_ra_rt_info_max_plen", 6709 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6710 .maxlen = sizeof(int), 6711 .mode = 0644, 6712 .proc_handler = proc_dointvec, 6713 }, 6714 #endif 6715 #endif 6716 { 6717 .procname = "proxy_ndp", 6718 .data = &ipv6_devconf.proxy_ndp, 6719 .maxlen = sizeof(int), 6720 .mode = 0644, 6721 .proc_handler = addrconf_sysctl_proxy_ndp, 6722 }, 6723 { 6724 .procname = "accept_source_route", 6725 .data = &ipv6_devconf.accept_source_route, 6726 .maxlen = sizeof(int), 6727 .mode = 0644, 6728 .proc_handler = proc_dointvec, 6729 }, 6730 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6731 { 6732 .procname = "optimistic_dad", 6733 .data = &ipv6_devconf.optimistic_dad, 6734 .maxlen = sizeof(int), 6735 .mode = 0644, 6736 .proc_handler = proc_dointvec, 6737 }, 6738 { 6739 .procname = "use_optimistic", 6740 .data = &ipv6_devconf.use_optimistic, 6741 .maxlen = sizeof(int), 6742 .mode = 0644, 6743 .proc_handler = proc_dointvec, 6744 }, 6745 #endif 6746 #ifdef CONFIG_IPV6_MROUTE 6747 { 6748 .procname = "mc_forwarding", 6749 .data = &ipv6_devconf.mc_forwarding, 6750 .maxlen = sizeof(int), 6751 .mode = 0444, 6752 .proc_handler = proc_dointvec, 6753 }, 6754 #endif 6755 { 6756 .procname = "disable_ipv6", 6757 .data = &ipv6_devconf.disable_ipv6, 6758 .maxlen = sizeof(int), 6759 .mode = 0644, 6760 .proc_handler = addrconf_sysctl_disable, 6761 }, 6762 { 6763 .procname = "accept_dad", 6764 .data = &ipv6_devconf.accept_dad, 6765 .maxlen = sizeof(int), 6766 .mode = 0644, 6767 .proc_handler = proc_dointvec, 6768 }, 6769 { 6770 .procname = "force_tllao", 6771 .data = &ipv6_devconf.force_tllao, 6772 .maxlen = sizeof(int), 6773 .mode = 0644, 6774 .proc_handler = proc_dointvec 6775 }, 6776 { 6777 .procname = "ndisc_notify", 6778 .data = &ipv6_devconf.ndisc_notify, 6779 .maxlen = sizeof(int), 6780 .mode = 0644, 6781 .proc_handler = proc_dointvec 6782 }, 6783 { 6784 .procname = "suppress_frag_ndisc", 6785 .data = &ipv6_devconf.suppress_frag_ndisc, 6786 .maxlen = sizeof(int), 6787 .mode = 0644, 6788 .proc_handler = proc_dointvec 6789 }, 6790 { 6791 .procname = "accept_ra_from_local", 6792 .data = &ipv6_devconf.accept_ra_from_local, 6793 .maxlen = sizeof(int), 6794 .mode = 0644, 6795 .proc_handler = proc_dointvec, 6796 }, 6797 { 6798 .procname = "accept_ra_mtu", 6799 .data = &ipv6_devconf.accept_ra_mtu, 6800 .maxlen = sizeof(int), 6801 .mode = 0644, 6802 .proc_handler = proc_dointvec, 6803 }, 6804 { 6805 .procname = "stable_secret", 6806 .data = &ipv6_devconf.stable_secret, 6807 .maxlen = IPV6_MAX_STRLEN, 6808 .mode = 0600, 6809 .proc_handler = addrconf_sysctl_stable_secret, 6810 }, 6811 { 6812 .procname = "use_oif_addrs_only", 6813 .data = &ipv6_devconf.use_oif_addrs_only, 6814 .maxlen = sizeof(int), 6815 .mode = 0644, 6816 .proc_handler = proc_dointvec, 6817 }, 6818 { 6819 .procname = "ignore_routes_with_linkdown", 6820 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6821 .maxlen = sizeof(int), 6822 .mode = 0644, 6823 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6824 }, 6825 { 6826 .procname = "drop_unicast_in_l2_multicast", 6827 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6828 .maxlen = sizeof(int), 6829 .mode = 0644, 6830 .proc_handler = proc_dointvec, 6831 }, 6832 { 6833 .procname = "drop_unsolicited_na", 6834 .data = &ipv6_devconf.drop_unsolicited_na, 6835 .maxlen = sizeof(int), 6836 .mode = 0644, 6837 .proc_handler = proc_dointvec, 6838 }, 6839 { 6840 .procname = "keep_addr_on_down", 6841 .data = &ipv6_devconf.keep_addr_on_down, 6842 .maxlen = sizeof(int), 6843 .mode = 0644, 6844 .proc_handler = proc_dointvec, 6845 6846 }, 6847 { 6848 .procname = "seg6_enabled", 6849 .data = &ipv6_devconf.seg6_enabled, 6850 .maxlen = sizeof(int), 6851 .mode = 0644, 6852 .proc_handler = proc_dointvec, 6853 }, 6854 #ifdef CONFIG_IPV6_SEG6_HMAC 6855 { 6856 .procname = "seg6_require_hmac", 6857 .data = &ipv6_devconf.seg6_require_hmac, 6858 .maxlen = sizeof(int), 6859 .mode = 0644, 6860 .proc_handler = proc_dointvec, 6861 }, 6862 #endif 6863 { 6864 .procname = "enhanced_dad", 6865 .data = &ipv6_devconf.enhanced_dad, 6866 .maxlen = sizeof(int), 6867 .mode = 0644, 6868 .proc_handler = proc_dointvec, 6869 }, 6870 { 6871 .procname = "addr_gen_mode", 6872 .data = &ipv6_devconf.addr_gen_mode, 6873 .maxlen = sizeof(int), 6874 .mode = 0644, 6875 .proc_handler = addrconf_sysctl_addr_gen_mode, 6876 }, 6877 { 6878 .procname = "disable_policy", 6879 .data = &ipv6_devconf.disable_policy, 6880 .maxlen = sizeof(int), 6881 .mode = 0644, 6882 .proc_handler = addrconf_sysctl_disable_policy, 6883 }, 6884 { 6885 .procname = "ndisc_tclass", 6886 .data = &ipv6_devconf.ndisc_tclass, 6887 .maxlen = sizeof(int), 6888 .mode = 0644, 6889 .proc_handler = proc_dointvec_minmax, 6890 .extra1 = (void *)SYSCTL_ZERO, 6891 .extra2 = (void *)&two_five_five, 6892 }, 6893 { 6894 .procname = "rpl_seg_enabled", 6895 .data = &ipv6_devconf.rpl_seg_enabled, 6896 .maxlen = sizeof(int), 6897 .mode = 0644, 6898 .proc_handler = proc_dointvec, 6899 }, 6900 { 6901 /* sentinel */ 6902 } 6903 }; 6904 6905 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 6906 struct inet6_dev *idev, struct ipv6_devconf *p) 6907 { 6908 int i, ifindex; 6909 struct ctl_table *table; 6910 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 6911 6912 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 6913 if (!table) 6914 goto out; 6915 6916 for (i = 0; table[i].data; i++) { 6917 table[i].data += (char *)p - (char *)&ipv6_devconf; 6918 /* If one of these is already set, then it is not safe to 6919 * overwrite either of them: this makes proc_dointvec_minmax 6920 * usable. 6921 */ 6922 if (!table[i].extra1 && !table[i].extra2) { 6923 table[i].extra1 = idev; /* embedded; no ref */ 6924 table[i].extra2 = net; 6925 } 6926 } 6927 6928 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 6929 6930 p->sysctl_header = register_net_sysctl(net, path, table); 6931 if (!p->sysctl_header) 6932 goto free; 6933 6934 if (!strcmp(dev_name, "all")) 6935 ifindex = NETCONFA_IFINDEX_ALL; 6936 else if (!strcmp(dev_name, "default")) 6937 ifindex = NETCONFA_IFINDEX_DEFAULT; 6938 else 6939 ifindex = idev->dev->ifindex; 6940 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 6941 ifindex, p); 6942 return 0; 6943 6944 free: 6945 kfree(table); 6946 out: 6947 return -ENOBUFS; 6948 } 6949 6950 static void __addrconf_sysctl_unregister(struct net *net, 6951 struct ipv6_devconf *p, int ifindex) 6952 { 6953 struct ctl_table *table; 6954 6955 if (!p->sysctl_header) 6956 return; 6957 6958 table = p->sysctl_header->ctl_table_arg; 6959 unregister_net_sysctl_table(p->sysctl_header); 6960 p->sysctl_header = NULL; 6961 kfree(table); 6962 6963 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 6964 } 6965 6966 static int addrconf_sysctl_register(struct inet6_dev *idev) 6967 { 6968 int err; 6969 6970 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 6971 return -EINVAL; 6972 6973 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 6974 &ndisc_ifinfo_sysctl_change); 6975 if (err) 6976 return err; 6977 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 6978 idev, &idev->cnf); 6979 if (err) 6980 neigh_sysctl_unregister(idev->nd_parms); 6981 6982 return err; 6983 } 6984 6985 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 6986 { 6987 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 6988 idev->dev->ifindex); 6989 neigh_sysctl_unregister(idev->nd_parms); 6990 } 6991 6992 6993 #endif 6994 6995 static int __net_init addrconf_init_net(struct net *net) 6996 { 6997 int err = -ENOMEM; 6998 struct ipv6_devconf *all, *dflt; 6999 7000 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 7001 if (!all) 7002 goto err_alloc_all; 7003 7004 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 7005 if (!dflt) 7006 goto err_alloc_dflt; 7007 7008 if (IS_ENABLED(CONFIG_SYSCTL) && 7009 !net_eq(net, &init_net)) { 7010 switch (sysctl_devconf_inherit_init_net) { 7011 case 1: /* copy from init_net */ 7012 memcpy(all, init_net.ipv6.devconf_all, 7013 sizeof(ipv6_devconf)); 7014 memcpy(dflt, init_net.ipv6.devconf_dflt, 7015 sizeof(ipv6_devconf_dflt)); 7016 break; 7017 case 3: /* copy from the current netns */ 7018 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all, 7019 sizeof(ipv6_devconf)); 7020 memcpy(dflt, 7021 current->nsproxy->net_ns->ipv6.devconf_dflt, 7022 sizeof(ipv6_devconf_dflt)); 7023 break; 7024 case 0: 7025 case 2: 7026 /* use compiled values */ 7027 break; 7028 } 7029 } 7030 7031 /* these will be inherited by all namespaces */ 7032 dflt->autoconf = ipv6_defaults.autoconf; 7033 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 7034 7035 dflt->stable_secret.initialized = false; 7036 all->stable_secret.initialized = false; 7037 7038 net->ipv6.devconf_all = all; 7039 net->ipv6.devconf_dflt = dflt; 7040 7041 #ifdef CONFIG_SYSCTL 7042 err = __addrconf_sysctl_register(net, "all", NULL, all); 7043 if (err < 0) 7044 goto err_reg_all; 7045 7046 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 7047 if (err < 0) 7048 goto err_reg_dflt; 7049 #endif 7050 return 0; 7051 7052 #ifdef CONFIG_SYSCTL 7053 err_reg_dflt: 7054 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 7055 err_reg_all: 7056 kfree(dflt); 7057 #endif 7058 err_alloc_dflt: 7059 kfree(all); 7060 err_alloc_all: 7061 return err; 7062 } 7063 7064 static void __net_exit addrconf_exit_net(struct net *net) 7065 { 7066 #ifdef CONFIG_SYSCTL 7067 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 7068 NETCONFA_IFINDEX_DEFAULT); 7069 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 7070 NETCONFA_IFINDEX_ALL); 7071 #endif 7072 kfree(net->ipv6.devconf_dflt); 7073 kfree(net->ipv6.devconf_all); 7074 } 7075 7076 static struct pernet_operations addrconf_ops = { 7077 .init = addrconf_init_net, 7078 .exit = addrconf_exit_net, 7079 }; 7080 7081 static struct rtnl_af_ops inet6_ops __read_mostly = { 7082 .family = AF_INET6, 7083 .fill_link_af = inet6_fill_link_af, 7084 .get_link_af_size = inet6_get_link_af_size, 7085 .validate_link_af = inet6_validate_link_af, 7086 .set_link_af = inet6_set_link_af, 7087 }; 7088 7089 /* 7090 * Init / cleanup code 7091 */ 7092 7093 int __init addrconf_init(void) 7094 { 7095 struct inet6_dev *idev; 7096 int i, err; 7097 7098 err = ipv6_addr_label_init(); 7099 if (err < 0) { 7100 pr_crit("%s: cannot initialize default policy table: %d\n", 7101 __func__, err); 7102 goto out; 7103 } 7104 7105 err = register_pernet_subsys(&addrconf_ops); 7106 if (err < 0) 7107 goto out_addrlabel; 7108 7109 addrconf_wq = create_workqueue("ipv6_addrconf"); 7110 if (!addrconf_wq) { 7111 err = -ENOMEM; 7112 goto out_nowq; 7113 } 7114 7115 /* The addrconf netdev notifier requires that loopback_dev 7116 * has it's ipv6 private information allocated and setup 7117 * before it can bring up and give link-local addresses 7118 * to other devices which are up. 7119 * 7120 * Unfortunately, loopback_dev is not necessarily the first 7121 * entry in the global dev_base list of net devices. In fact, 7122 * it is likely to be the very last entry on that list. 7123 * So this causes the notifier registry below to try and 7124 * give link-local addresses to all devices besides loopback_dev 7125 * first, then loopback_dev, which cases all the non-loopback_dev 7126 * devices to fail to get a link-local address. 7127 * 7128 * So, as a temporary fix, allocate the ipv6 structure for 7129 * loopback_dev first by hand. 7130 * Longer term, all of the dependencies ipv6 has upon the loopback 7131 * device and it being up should be removed. 7132 */ 7133 rtnl_lock(); 7134 idev = ipv6_add_dev(init_net.loopback_dev); 7135 rtnl_unlock(); 7136 if (IS_ERR(idev)) { 7137 err = PTR_ERR(idev); 7138 goto errlo; 7139 } 7140 7141 ip6_route_init_special_entries(); 7142 7143 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7144 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 7145 7146 register_netdevice_notifier(&ipv6_dev_notf); 7147 7148 addrconf_verify(); 7149 7150 rtnl_af_register(&inet6_ops); 7151 7152 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK, 7153 NULL, inet6_dump_ifinfo, 0); 7154 if (err < 0) 7155 goto errout; 7156 7157 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR, 7158 inet6_rtm_newaddr, NULL, 0); 7159 if (err < 0) 7160 goto errout; 7161 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR, 7162 inet6_rtm_deladdr, NULL, 0); 7163 if (err < 0) 7164 goto errout; 7165 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR, 7166 inet6_rtm_getaddr, inet6_dump_ifaddr, 7167 RTNL_FLAG_DOIT_UNLOCKED); 7168 if (err < 0) 7169 goto errout; 7170 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST, 7171 NULL, inet6_dump_ifmcaddr, 0); 7172 if (err < 0) 7173 goto errout; 7174 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST, 7175 NULL, inet6_dump_ifacaddr, 0); 7176 if (err < 0) 7177 goto errout; 7178 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF, 7179 inet6_netconf_get_devconf, 7180 inet6_netconf_dump_devconf, 7181 RTNL_FLAG_DOIT_UNLOCKED); 7182 if (err < 0) 7183 goto errout; 7184 err = ipv6_addr_label_rtnl_register(); 7185 if (err < 0) 7186 goto errout; 7187 7188 return 0; 7189 errout: 7190 rtnl_unregister_all(PF_INET6); 7191 rtnl_af_unregister(&inet6_ops); 7192 unregister_netdevice_notifier(&ipv6_dev_notf); 7193 errlo: 7194 destroy_workqueue(addrconf_wq); 7195 out_nowq: 7196 unregister_pernet_subsys(&addrconf_ops); 7197 out_addrlabel: 7198 ipv6_addr_label_cleanup(); 7199 out: 7200 return err; 7201 } 7202 7203 void addrconf_cleanup(void) 7204 { 7205 struct net_device *dev; 7206 int i; 7207 7208 unregister_netdevice_notifier(&ipv6_dev_notf); 7209 unregister_pernet_subsys(&addrconf_ops); 7210 ipv6_addr_label_cleanup(); 7211 7212 rtnl_af_unregister(&inet6_ops); 7213 7214 rtnl_lock(); 7215 7216 /* clean dev list */ 7217 for_each_netdev(&init_net, dev) { 7218 if (__in6_dev_get(dev) == NULL) 7219 continue; 7220 addrconf_ifdown(dev, true); 7221 } 7222 addrconf_ifdown(init_net.loopback_dev, true); 7223 7224 /* 7225 * Check hash table. 7226 */ 7227 spin_lock_bh(&addrconf_hash_lock); 7228 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7229 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 7230 spin_unlock_bh(&addrconf_hash_lock); 7231 cancel_delayed_work(&addr_chk_work); 7232 rtnl_unlock(); 7233 7234 destroy_workqueue(addrconf_wq); 7235 } 7236