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