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 #include <linux/ioam6.h> 93 94 #define INFINITY_LIFE_TIME 0xFFFFFFFF 95 96 #define IPV6_MAX_STRLEN \ 97 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") 98 99 static inline u32 cstamp_delta(unsigned long cstamp) 100 { 101 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 102 } 103 104 static inline s32 rfc3315_s14_backoff_init(s32 irt) 105 { 106 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */ 107 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt; 108 do_div(tmp, 1000000); 109 return (s32)tmp; 110 } 111 112 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt) 113 { 114 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */ 115 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt; 116 do_div(tmp, 1000000); 117 if ((s32)tmp > mrt) { 118 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */ 119 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt; 120 do_div(tmp, 1000000); 121 } 122 return (s32)tmp; 123 } 124 125 #ifdef CONFIG_SYSCTL 126 static int addrconf_sysctl_register(struct inet6_dev *idev); 127 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 128 #else 129 static inline int addrconf_sysctl_register(struct inet6_dev *idev) 130 { 131 return 0; 132 } 133 134 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 135 { 136 } 137 #endif 138 139 static void ipv6_gen_rnd_iid(struct in6_addr *addr); 140 141 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 142 static int ipv6_count_addresses(const struct inet6_dev *idev); 143 static int ipv6_generate_stable_address(struct in6_addr *addr, 144 u8 dad_count, 145 const struct inet6_dev *idev); 146 147 #define IN6_ADDR_HSIZE_SHIFT 8 148 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT) 149 /* 150 * Configured unicast address hash table 151 */ 152 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 153 static DEFINE_SPINLOCK(addrconf_hash_lock); 154 155 static void addrconf_verify(void); 156 static void addrconf_verify_rtnl(void); 157 static void addrconf_verify_work(struct work_struct *); 158 159 static struct workqueue_struct *addrconf_wq; 160 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work); 161 162 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 163 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 164 165 static void addrconf_type_change(struct net_device *dev, 166 unsigned long event); 167 static int addrconf_ifdown(struct net_device *dev, bool unregister); 168 169 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 170 int plen, 171 const struct net_device *dev, 172 u32 flags, u32 noflags, 173 bool no_gw); 174 175 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 176 static void addrconf_dad_work(struct work_struct *w); 177 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 178 bool send_na); 179 static void addrconf_dad_run(struct inet6_dev *idev, bool restart); 180 static void addrconf_rs_timer(struct timer_list *t); 181 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 182 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 183 184 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 185 struct prefix_info *pinfo); 186 187 static struct ipv6_devconf ipv6_devconf __read_mostly = { 188 .forwarding = 0, 189 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 190 .mtu6 = IPV6_MIN_MTU, 191 .accept_ra = 1, 192 .accept_redirects = 1, 193 .autoconf = 1, 194 .force_mld_version = 0, 195 .mldv1_unsolicited_report_interval = 10 * HZ, 196 .mldv2_unsolicited_report_interval = HZ, 197 .dad_transmits = 1, 198 .rtr_solicits = MAX_RTR_SOLICITATIONS, 199 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 200 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 201 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 202 .use_tempaddr = 0, 203 .temp_valid_lft = TEMP_VALID_LIFETIME, 204 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 205 .regen_max_retry = REGEN_MAX_RETRY, 206 .max_desync_factor = MAX_DESYNC_FACTOR, 207 .max_addresses = IPV6_MAX_ADDRESSES, 208 .accept_ra_defrtr = 1, 209 .ra_defrtr_metric = IP6_RT_PRIO_USER, 210 .accept_ra_from_local = 0, 211 .accept_ra_min_hop_limit= 1, 212 .accept_ra_pinfo = 1, 213 #ifdef CONFIG_IPV6_ROUTER_PREF 214 .accept_ra_rtr_pref = 1, 215 .rtr_probe_interval = 60 * HZ, 216 #ifdef CONFIG_IPV6_ROUTE_INFO 217 .accept_ra_rt_info_min_plen = 0, 218 .accept_ra_rt_info_max_plen = 0, 219 #endif 220 #endif 221 .proxy_ndp = 0, 222 .accept_source_route = 0, /* we do not accept RH0 by default. */ 223 .disable_ipv6 = 0, 224 .accept_dad = 0, 225 .suppress_frag_ndisc = 1, 226 .accept_ra_mtu = 1, 227 .stable_secret = { 228 .initialized = false, 229 }, 230 .use_oif_addrs_only = 0, 231 .ignore_routes_with_linkdown = 0, 232 .keep_addr_on_down = 0, 233 .seg6_enabled = 0, 234 #ifdef CONFIG_IPV6_SEG6_HMAC 235 .seg6_require_hmac = 0, 236 #endif 237 .enhanced_dad = 1, 238 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 239 .disable_policy = 0, 240 .rpl_seg_enabled = 0, 241 .ioam6_enabled = 0, 242 .ioam6_id = IOAM6_DEFAULT_IF_ID, 243 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE, 244 }; 245 246 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 247 .forwarding = 0, 248 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 249 .mtu6 = IPV6_MIN_MTU, 250 .accept_ra = 1, 251 .accept_redirects = 1, 252 .autoconf = 1, 253 .force_mld_version = 0, 254 .mldv1_unsolicited_report_interval = 10 * HZ, 255 .mldv2_unsolicited_report_interval = HZ, 256 .dad_transmits = 1, 257 .rtr_solicits = MAX_RTR_SOLICITATIONS, 258 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 259 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 260 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 261 .use_tempaddr = 0, 262 .temp_valid_lft = TEMP_VALID_LIFETIME, 263 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 264 .regen_max_retry = REGEN_MAX_RETRY, 265 .max_desync_factor = MAX_DESYNC_FACTOR, 266 .max_addresses = IPV6_MAX_ADDRESSES, 267 .accept_ra_defrtr = 1, 268 .ra_defrtr_metric = IP6_RT_PRIO_USER, 269 .accept_ra_from_local = 0, 270 .accept_ra_min_hop_limit= 1, 271 .accept_ra_pinfo = 1, 272 #ifdef CONFIG_IPV6_ROUTER_PREF 273 .accept_ra_rtr_pref = 1, 274 .rtr_probe_interval = 60 * HZ, 275 #ifdef CONFIG_IPV6_ROUTE_INFO 276 .accept_ra_rt_info_min_plen = 0, 277 .accept_ra_rt_info_max_plen = 0, 278 #endif 279 #endif 280 .proxy_ndp = 0, 281 .accept_source_route = 0, /* we do not accept RH0 by default. */ 282 .disable_ipv6 = 0, 283 .accept_dad = 1, 284 .suppress_frag_ndisc = 1, 285 .accept_ra_mtu = 1, 286 .stable_secret = { 287 .initialized = false, 288 }, 289 .use_oif_addrs_only = 0, 290 .ignore_routes_with_linkdown = 0, 291 .keep_addr_on_down = 0, 292 .seg6_enabled = 0, 293 #ifdef CONFIG_IPV6_SEG6_HMAC 294 .seg6_require_hmac = 0, 295 #endif 296 .enhanced_dad = 1, 297 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 298 .disable_policy = 0, 299 .rpl_seg_enabled = 0, 300 .ioam6_enabled = 0, 301 .ioam6_id = IOAM6_DEFAULT_IF_ID, 302 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE, 303 }; 304 305 /* Check if link is ready: is it up and is a valid qdisc available */ 306 static inline bool addrconf_link_ready(const struct net_device *dev) 307 { 308 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev); 309 } 310 311 static void addrconf_del_rs_timer(struct inet6_dev *idev) 312 { 313 if (del_timer(&idev->rs_timer)) 314 __in6_dev_put(idev); 315 } 316 317 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 318 { 319 if (cancel_delayed_work(&ifp->dad_work)) 320 __in6_ifa_put(ifp); 321 } 322 323 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 324 unsigned long when) 325 { 326 if (!timer_pending(&idev->rs_timer)) 327 in6_dev_hold(idev); 328 mod_timer(&idev->rs_timer, jiffies + when); 329 } 330 331 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 332 unsigned long delay) 333 { 334 in6_ifa_hold(ifp); 335 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay)) 336 in6_ifa_put(ifp); 337 } 338 339 static int snmp6_alloc_dev(struct inet6_dev *idev) 340 { 341 int i; 342 343 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib); 344 if (!idev->stats.ipv6) 345 goto err_ip; 346 347 for_each_possible_cpu(i) { 348 struct ipstats_mib *addrconf_stats; 349 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 350 u64_stats_init(&addrconf_stats->syncp); 351 } 352 353 354 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 355 GFP_KERNEL); 356 if (!idev->stats.icmpv6dev) 357 goto err_icmp; 358 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 359 GFP_KERNEL); 360 if (!idev->stats.icmpv6msgdev) 361 goto err_icmpmsg; 362 363 return 0; 364 365 err_icmpmsg: 366 kfree(idev->stats.icmpv6dev); 367 err_icmp: 368 free_percpu(idev->stats.ipv6); 369 err_ip: 370 return -ENOMEM; 371 } 372 373 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 374 { 375 struct inet6_dev *ndev; 376 int err = -ENOMEM; 377 378 ASSERT_RTNL(); 379 380 if (dev->mtu < IPV6_MIN_MTU) 381 return ERR_PTR(-EINVAL); 382 383 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 384 if (!ndev) 385 return ERR_PTR(err); 386 387 rwlock_init(&ndev->lock); 388 ndev->dev = dev; 389 INIT_LIST_HEAD(&ndev->addr_list); 390 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0); 391 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 392 393 if (ndev->cnf.stable_secret.initialized) 394 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 395 396 ndev->cnf.mtu6 = dev->mtu; 397 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 398 if (!ndev->nd_parms) { 399 kfree(ndev); 400 return ERR_PTR(err); 401 } 402 if (ndev->cnf.forwarding) 403 dev_disable_lro(dev); 404 /* We refer to the device */ 405 dev_hold(dev); 406 407 if (snmp6_alloc_dev(ndev) < 0) { 408 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n", 409 __func__); 410 neigh_parms_release(&nd_tbl, ndev->nd_parms); 411 dev_put(dev); 412 kfree(ndev); 413 return ERR_PTR(err); 414 } 415 416 if (snmp6_register_dev(ndev) < 0) { 417 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n", 418 __func__, dev->name); 419 goto err_release; 420 } 421 422 /* One reference from device. */ 423 refcount_set(&ndev->refcnt, 1); 424 425 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 426 ndev->cnf.accept_dad = -1; 427 428 #if IS_ENABLED(CONFIG_IPV6_SIT) 429 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 430 pr_info("%s: Disabled Multicast RS\n", dev->name); 431 ndev->cnf.rtr_solicits = 0; 432 } 433 #endif 434 435 INIT_LIST_HEAD(&ndev->tempaddr_list); 436 ndev->desync_factor = U32_MAX; 437 if ((dev->flags&IFF_LOOPBACK) || 438 dev->type == ARPHRD_TUNNEL || 439 dev->type == ARPHRD_TUNNEL6 || 440 dev->type == ARPHRD_SIT || 441 dev->type == ARPHRD_NONE) { 442 ndev->cnf.use_tempaddr = -1; 443 } 444 445 ndev->token = in6addr_any; 446 447 if (netif_running(dev) && addrconf_link_ready(dev)) 448 ndev->if_flags |= IF_READY; 449 450 ipv6_mc_init_dev(ndev); 451 ndev->tstamp = jiffies; 452 err = addrconf_sysctl_register(ndev); 453 if (err) { 454 ipv6_mc_destroy_dev(ndev); 455 snmp6_unregister_dev(ndev); 456 goto err_release; 457 } 458 /* protected by rtnl_lock */ 459 rcu_assign_pointer(dev->ip6_ptr, ndev); 460 461 /* Join interface-local all-node multicast group */ 462 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 463 464 /* Join all-node multicast group */ 465 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 466 467 /* Join all-router multicast group if forwarding is set */ 468 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 469 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 470 471 return ndev; 472 473 err_release: 474 neigh_parms_release(&nd_tbl, ndev->nd_parms); 475 ndev->dead = 1; 476 in6_dev_finish_destroy(ndev); 477 return ERR_PTR(err); 478 } 479 480 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 481 { 482 struct inet6_dev *idev; 483 484 ASSERT_RTNL(); 485 486 idev = __in6_dev_get(dev); 487 if (!idev) { 488 idev = ipv6_add_dev(dev); 489 if (IS_ERR(idev)) 490 return idev; 491 } 492 493 if (dev->flags&IFF_UP) 494 ipv6_mc_up(idev); 495 return idev; 496 } 497 498 static int inet6_netconf_msgsize_devconf(int type) 499 { 500 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 501 + nla_total_size(4); /* NETCONFA_IFINDEX */ 502 bool all = false; 503 504 if (type == NETCONFA_ALL) 505 all = true; 506 507 if (all || type == NETCONFA_FORWARDING) 508 size += nla_total_size(4); 509 #ifdef CONFIG_IPV6_MROUTE 510 if (all || type == NETCONFA_MC_FORWARDING) 511 size += nla_total_size(4); 512 #endif 513 if (all || type == NETCONFA_PROXY_NEIGH) 514 size += nla_total_size(4); 515 516 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 517 size += nla_total_size(4); 518 519 return size; 520 } 521 522 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 523 struct ipv6_devconf *devconf, u32 portid, 524 u32 seq, int event, unsigned int flags, 525 int type) 526 { 527 struct nlmsghdr *nlh; 528 struct netconfmsg *ncm; 529 bool all = false; 530 531 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 532 flags); 533 if (!nlh) 534 return -EMSGSIZE; 535 536 if (type == NETCONFA_ALL) 537 all = true; 538 539 ncm = nlmsg_data(nlh); 540 ncm->ncm_family = AF_INET6; 541 542 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 543 goto nla_put_failure; 544 545 if (!devconf) 546 goto out; 547 548 if ((all || type == NETCONFA_FORWARDING) && 549 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 550 goto nla_put_failure; 551 #ifdef CONFIG_IPV6_MROUTE 552 if ((all || type == NETCONFA_MC_FORWARDING) && 553 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 554 devconf->mc_forwarding) < 0) 555 goto nla_put_failure; 556 #endif 557 if ((all || type == NETCONFA_PROXY_NEIGH) && 558 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 559 goto nla_put_failure; 560 561 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 562 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 563 devconf->ignore_routes_with_linkdown) < 0) 564 goto nla_put_failure; 565 566 out: 567 nlmsg_end(skb, nlh); 568 return 0; 569 570 nla_put_failure: 571 nlmsg_cancel(skb, nlh); 572 return -EMSGSIZE; 573 } 574 575 void inet6_netconf_notify_devconf(struct net *net, int event, int type, 576 int ifindex, struct ipv6_devconf *devconf) 577 { 578 struct sk_buff *skb; 579 int err = -ENOBUFS; 580 581 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL); 582 if (!skb) 583 goto errout; 584 585 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 586 event, 0, type); 587 if (err < 0) { 588 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 589 WARN_ON(err == -EMSGSIZE); 590 kfree_skb(skb); 591 goto errout; 592 } 593 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL); 594 return; 595 errout: 596 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 597 } 598 599 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 600 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 601 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 602 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 603 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 604 }; 605 606 static int inet6_netconf_valid_get_req(struct sk_buff *skb, 607 const struct nlmsghdr *nlh, 608 struct nlattr **tb, 609 struct netlink_ext_ack *extack) 610 { 611 int i, err; 612 613 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) { 614 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request"); 615 return -EINVAL; 616 } 617 618 if (!netlink_strict_get_check(skb)) 619 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg), 620 tb, NETCONFA_MAX, 621 devconf_ipv6_policy, extack); 622 623 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg), 624 tb, NETCONFA_MAX, 625 devconf_ipv6_policy, extack); 626 if (err) 627 return err; 628 629 for (i = 0; i <= NETCONFA_MAX; i++) { 630 if (!tb[i]) 631 continue; 632 633 switch (i) { 634 case NETCONFA_IFINDEX: 635 break; 636 default: 637 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request"); 638 return -EINVAL; 639 } 640 } 641 642 return 0; 643 } 644 645 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 646 struct nlmsghdr *nlh, 647 struct netlink_ext_ack *extack) 648 { 649 struct net *net = sock_net(in_skb->sk); 650 struct nlattr *tb[NETCONFA_MAX+1]; 651 struct inet6_dev *in6_dev = NULL; 652 struct net_device *dev = NULL; 653 struct sk_buff *skb; 654 struct ipv6_devconf *devconf; 655 int ifindex; 656 int err; 657 658 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack); 659 if (err < 0) 660 return err; 661 662 if (!tb[NETCONFA_IFINDEX]) 663 return -EINVAL; 664 665 err = -EINVAL; 666 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 667 switch (ifindex) { 668 case NETCONFA_IFINDEX_ALL: 669 devconf = net->ipv6.devconf_all; 670 break; 671 case NETCONFA_IFINDEX_DEFAULT: 672 devconf = net->ipv6.devconf_dflt; 673 break; 674 default: 675 dev = dev_get_by_index(net, ifindex); 676 if (!dev) 677 return -EINVAL; 678 in6_dev = in6_dev_get(dev); 679 if (!in6_dev) 680 goto errout; 681 devconf = &in6_dev->cnf; 682 break; 683 } 684 685 err = -ENOBUFS; 686 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); 687 if (!skb) 688 goto errout; 689 690 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 691 NETLINK_CB(in_skb).portid, 692 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 693 NETCONFA_ALL); 694 if (err < 0) { 695 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 696 WARN_ON(err == -EMSGSIZE); 697 kfree_skb(skb); 698 goto errout; 699 } 700 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 701 errout: 702 if (in6_dev) 703 in6_dev_put(in6_dev); 704 if (dev) 705 dev_put(dev); 706 return err; 707 } 708 709 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 710 struct netlink_callback *cb) 711 { 712 const struct nlmsghdr *nlh = cb->nlh; 713 struct net *net = sock_net(skb->sk); 714 int h, s_h; 715 int idx, s_idx; 716 struct net_device *dev; 717 struct inet6_dev *idev; 718 struct hlist_head *head; 719 720 if (cb->strict_check) { 721 struct netlink_ext_ack *extack = cb->extack; 722 struct netconfmsg *ncm; 723 724 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) { 725 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request"); 726 return -EINVAL; 727 } 728 729 if (nlmsg_attrlen(nlh, sizeof(*ncm))) { 730 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request"); 731 return -EINVAL; 732 } 733 } 734 735 s_h = cb->args[0]; 736 s_idx = idx = cb->args[1]; 737 738 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 739 idx = 0; 740 head = &net->dev_index_head[h]; 741 rcu_read_lock(); 742 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 743 net->dev_base_seq; 744 hlist_for_each_entry_rcu(dev, head, index_hlist) { 745 if (idx < s_idx) 746 goto cont; 747 idev = __in6_dev_get(dev); 748 if (!idev) 749 goto cont; 750 751 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 752 &idev->cnf, 753 NETLINK_CB(cb->skb).portid, 754 nlh->nlmsg_seq, 755 RTM_NEWNETCONF, 756 NLM_F_MULTI, 757 NETCONFA_ALL) < 0) { 758 rcu_read_unlock(); 759 goto done; 760 } 761 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 762 cont: 763 idx++; 764 } 765 rcu_read_unlock(); 766 } 767 if (h == NETDEV_HASHENTRIES) { 768 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 769 net->ipv6.devconf_all, 770 NETLINK_CB(cb->skb).portid, 771 nlh->nlmsg_seq, 772 RTM_NEWNETCONF, NLM_F_MULTI, 773 NETCONFA_ALL) < 0) 774 goto done; 775 else 776 h++; 777 } 778 if (h == NETDEV_HASHENTRIES + 1) { 779 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 780 net->ipv6.devconf_dflt, 781 NETLINK_CB(cb->skb).portid, 782 nlh->nlmsg_seq, 783 RTM_NEWNETCONF, NLM_F_MULTI, 784 NETCONFA_ALL) < 0) 785 goto done; 786 else 787 h++; 788 } 789 done: 790 cb->args[0] = h; 791 cb->args[1] = idx; 792 793 return skb->len; 794 } 795 796 #ifdef CONFIG_SYSCTL 797 static void dev_forward_change(struct inet6_dev *idev) 798 { 799 struct net_device *dev; 800 struct inet6_ifaddr *ifa; 801 802 if (!idev) 803 return; 804 dev = idev->dev; 805 if (idev->cnf.forwarding) 806 dev_disable_lro(dev); 807 if (dev->flags & IFF_MULTICAST) { 808 if (idev->cnf.forwarding) { 809 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 810 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 811 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 812 } else { 813 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 814 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 815 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 816 } 817 } 818 819 list_for_each_entry(ifa, &idev->addr_list, if_list) { 820 if (ifa->flags&IFA_F_TENTATIVE) 821 continue; 822 if (idev->cnf.forwarding) 823 addrconf_join_anycast(ifa); 824 else 825 addrconf_leave_anycast(ifa); 826 } 827 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, 828 NETCONFA_FORWARDING, 829 dev->ifindex, &idev->cnf); 830 } 831 832 833 static void addrconf_forward_change(struct net *net, __s32 newf) 834 { 835 struct net_device *dev; 836 struct inet6_dev *idev; 837 838 for_each_netdev(net, dev) { 839 idev = __in6_dev_get(dev); 840 if (idev) { 841 int changed = (!idev->cnf.forwarding) ^ (!newf); 842 idev->cnf.forwarding = newf; 843 if (changed) 844 dev_forward_change(idev); 845 } 846 } 847 } 848 849 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 850 { 851 struct net *net; 852 int old; 853 854 if (!rtnl_trylock()) 855 return restart_syscall(); 856 857 net = (struct net *)table->extra2; 858 old = *p; 859 *p = newf; 860 861 if (p == &net->ipv6.devconf_dflt->forwarding) { 862 if ((!newf) ^ (!old)) 863 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 864 NETCONFA_FORWARDING, 865 NETCONFA_IFINDEX_DEFAULT, 866 net->ipv6.devconf_dflt); 867 rtnl_unlock(); 868 return 0; 869 } 870 871 if (p == &net->ipv6.devconf_all->forwarding) { 872 int old_dflt = net->ipv6.devconf_dflt->forwarding; 873 874 net->ipv6.devconf_dflt->forwarding = newf; 875 if ((!newf) ^ (!old_dflt)) 876 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 877 NETCONFA_FORWARDING, 878 NETCONFA_IFINDEX_DEFAULT, 879 net->ipv6.devconf_dflt); 880 881 addrconf_forward_change(net, newf); 882 if ((!newf) ^ (!old)) 883 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 884 NETCONFA_FORWARDING, 885 NETCONFA_IFINDEX_ALL, 886 net->ipv6.devconf_all); 887 } else if ((!newf) ^ (!old)) 888 dev_forward_change((struct inet6_dev *)table->extra1); 889 rtnl_unlock(); 890 891 if (newf) 892 rt6_purge_dflt_routers(net); 893 return 1; 894 } 895 896 static void addrconf_linkdown_change(struct net *net, __s32 newf) 897 { 898 struct net_device *dev; 899 struct inet6_dev *idev; 900 901 for_each_netdev(net, dev) { 902 idev = __in6_dev_get(dev); 903 if (idev) { 904 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 905 906 idev->cnf.ignore_routes_with_linkdown = newf; 907 if (changed) 908 inet6_netconf_notify_devconf(dev_net(dev), 909 RTM_NEWNETCONF, 910 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 911 dev->ifindex, 912 &idev->cnf); 913 } 914 } 915 } 916 917 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 918 { 919 struct net *net; 920 int old; 921 922 if (!rtnl_trylock()) 923 return restart_syscall(); 924 925 net = (struct net *)table->extra2; 926 old = *p; 927 *p = newf; 928 929 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 930 if ((!newf) ^ (!old)) 931 inet6_netconf_notify_devconf(net, 932 RTM_NEWNETCONF, 933 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 934 NETCONFA_IFINDEX_DEFAULT, 935 net->ipv6.devconf_dflt); 936 rtnl_unlock(); 937 return 0; 938 } 939 940 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 941 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 942 addrconf_linkdown_change(net, newf); 943 if ((!newf) ^ (!old)) 944 inet6_netconf_notify_devconf(net, 945 RTM_NEWNETCONF, 946 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 947 NETCONFA_IFINDEX_ALL, 948 net->ipv6.devconf_all); 949 } 950 rtnl_unlock(); 951 952 return 1; 953 } 954 955 #endif 956 957 /* Nobody refers to this ifaddr, destroy it */ 958 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 959 { 960 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 961 962 #ifdef NET_REFCNT_DEBUG 963 pr_debug("%s\n", __func__); 964 #endif 965 966 in6_dev_put(ifp->idev); 967 968 if (cancel_delayed_work(&ifp->dad_work)) 969 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 970 ifp); 971 972 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 973 pr_warn("Freeing alive inet6 address %p\n", ifp); 974 return; 975 } 976 977 kfree_rcu(ifp, rcu); 978 } 979 980 static void 981 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 982 { 983 struct list_head *p; 984 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 985 986 /* 987 * Each device address list is sorted in order of scope - 988 * global before linklocal. 989 */ 990 list_for_each(p, &idev->addr_list) { 991 struct inet6_ifaddr *ifa 992 = list_entry(p, struct inet6_ifaddr, if_list); 993 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 994 break; 995 } 996 997 list_add_tail_rcu(&ifp->if_list, p); 998 } 999 1000 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr) 1001 { 1002 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net); 1003 1004 return hash_32(val, IN6_ADDR_HSIZE_SHIFT); 1005 } 1006 1007 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1008 struct net_device *dev, unsigned int hash) 1009 { 1010 struct inet6_ifaddr *ifp; 1011 1012 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1013 if (!net_eq(dev_net(ifp->idev->dev), net)) 1014 continue; 1015 if (ipv6_addr_equal(&ifp->addr, addr)) { 1016 if (!dev || ifp->idev->dev == dev) 1017 return true; 1018 } 1019 } 1020 return false; 1021 } 1022 1023 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa) 1024 { 1025 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr); 1026 int err = 0; 1027 1028 spin_lock(&addrconf_hash_lock); 1029 1030 /* Ignore adding duplicate addresses on an interface */ 1031 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) { 1032 netdev_dbg(dev, "ipv6_add_addr: already assigned\n"); 1033 err = -EEXIST; 1034 } else { 1035 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 1036 } 1037 1038 spin_unlock(&addrconf_hash_lock); 1039 1040 return err; 1041 } 1042 1043 /* On success it returns ifp with increased reference count */ 1044 1045 static struct inet6_ifaddr * 1046 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg, 1047 bool can_block, struct netlink_ext_ack *extack) 1048 { 1049 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC; 1050 int addr_type = ipv6_addr_type(cfg->pfx); 1051 struct net *net = dev_net(idev->dev); 1052 struct inet6_ifaddr *ifa = NULL; 1053 struct fib6_info *f6i = NULL; 1054 int err = 0; 1055 1056 if (addr_type == IPV6_ADDR_ANY || 1057 (addr_type & IPV6_ADDR_MULTICAST && 1058 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) || 1059 (!(idev->dev->flags & IFF_LOOPBACK) && 1060 !netif_is_l3_master(idev->dev) && 1061 addr_type & IPV6_ADDR_LOOPBACK)) 1062 return ERR_PTR(-EADDRNOTAVAIL); 1063 1064 if (idev->dead) { 1065 err = -ENODEV; /*XXX*/ 1066 goto out; 1067 } 1068 1069 if (idev->cnf.disable_ipv6) { 1070 err = -EACCES; 1071 goto out; 1072 } 1073 1074 /* validator notifier needs to be blocking; 1075 * do not call in atomic context 1076 */ 1077 if (can_block) { 1078 struct in6_validator_info i6vi = { 1079 .i6vi_addr = *cfg->pfx, 1080 .i6vi_dev = idev, 1081 .extack = extack, 1082 }; 1083 1084 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi); 1085 err = notifier_to_errno(err); 1086 if (err < 0) 1087 goto out; 1088 } 1089 1090 ifa = kzalloc(sizeof(*ifa), gfp_flags | __GFP_ACCOUNT); 1091 if (!ifa) { 1092 err = -ENOBUFS; 1093 goto out; 1094 } 1095 1096 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags); 1097 if (IS_ERR(f6i)) { 1098 err = PTR_ERR(f6i); 1099 f6i = NULL; 1100 goto out; 1101 } 1102 1103 if (net->ipv6.devconf_all->disable_policy || 1104 idev->cnf.disable_policy) 1105 f6i->dst_nopolicy = true; 1106 1107 neigh_parms_data_state_setall(idev->nd_parms); 1108 1109 ifa->addr = *cfg->pfx; 1110 if (cfg->peer_pfx) 1111 ifa->peer_addr = *cfg->peer_pfx; 1112 1113 spin_lock_init(&ifa->lock); 1114 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1115 INIT_HLIST_NODE(&ifa->addr_lst); 1116 ifa->scope = cfg->scope; 1117 ifa->prefix_len = cfg->plen; 1118 ifa->rt_priority = cfg->rt_priority; 1119 ifa->flags = cfg->ifa_flags; 1120 /* No need to add the TENTATIVE flag for addresses with NODAD */ 1121 if (!(cfg->ifa_flags & IFA_F_NODAD)) 1122 ifa->flags |= IFA_F_TENTATIVE; 1123 ifa->valid_lft = cfg->valid_lft; 1124 ifa->prefered_lft = cfg->preferred_lft; 1125 ifa->cstamp = ifa->tstamp = jiffies; 1126 ifa->tokenized = false; 1127 1128 ifa->rt = f6i; 1129 1130 ifa->idev = idev; 1131 in6_dev_hold(idev); 1132 1133 /* For caller */ 1134 refcount_set(&ifa->refcnt, 1); 1135 1136 rcu_read_lock_bh(); 1137 1138 err = ipv6_add_addr_hash(idev->dev, ifa); 1139 if (err < 0) { 1140 rcu_read_unlock_bh(); 1141 goto out; 1142 } 1143 1144 write_lock(&idev->lock); 1145 1146 /* Add to inet6_dev unicast addr list. */ 1147 ipv6_link_dev_addr(idev, ifa); 1148 1149 if (ifa->flags&IFA_F_TEMPORARY) { 1150 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1151 in6_ifa_hold(ifa); 1152 } 1153 1154 in6_ifa_hold(ifa); 1155 write_unlock(&idev->lock); 1156 1157 rcu_read_unlock_bh(); 1158 1159 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1160 out: 1161 if (unlikely(err < 0)) { 1162 fib6_info_release(f6i); 1163 1164 if (ifa) { 1165 if (ifa->idev) 1166 in6_dev_put(ifa->idev); 1167 kfree(ifa); 1168 } 1169 ifa = ERR_PTR(err); 1170 } 1171 1172 return ifa; 1173 } 1174 1175 enum cleanup_prefix_rt_t { 1176 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1177 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1178 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1179 }; 1180 1181 /* 1182 * Check, whether the prefix for ifp would still need a prefix route 1183 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1184 * constants. 1185 * 1186 * 1) we don't purge prefix if address was not permanent. 1187 * prefix is managed by its own lifetime. 1188 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1189 * 3) if there are no addresses, delete prefix. 1190 * 4) if there are still other permanent address(es), 1191 * corresponding prefix is still permanent. 1192 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1193 * don't purge the prefix, assume user space is managing it. 1194 * 6) otherwise, update prefix lifetime to the 1195 * longest valid lifetime among the corresponding 1196 * addresses on the device. 1197 * Note: subsequent RA will update lifetime. 1198 **/ 1199 static enum cleanup_prefix_rt_t 1200 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1201 { 1202 struct inet6_ifaddr *ifa; 1203 struct inet6_dev *idev = ifp->idev; 1204 unsigned long lifetime; 1205 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1206 1207 *expires = jiffies; 1208 1209 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1210 if (ifa == ifp) 1211 continue; 1212 if (ifa->prefix_len != ifp->prefix_len || 1213 !ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1214 ifp->prefix_len)) 1215 continue; 1216 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1217 return CLEANUP_PREFIX_RT_NOP; 1218 1219 action = CLEANUP_PREFIX_RT_EXPIRE; 1220 1221 spin_lock(&ifa->lock); 1222 1223 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1224 /* 1225 * Note: Because this address is 1226 * not permanent, lifetime < 1227 * LONG_MAX / HZ here. 1228 */ 1229 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1230 *expires = ifa->tstamp + lifetime * HZ; 1231 spin_unlock(&ifa->lock); 1232 } 1233 1234 return action; 1235 } 1236 1237 static void 1238 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, 1239 bool del_rt, bool del_peer) 1240 { 1241 struct fib6_info *f6i; 1242 1243 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr, 1244 ifp->prefix_len, 1245 ifp->idev->dev, 0, RTF_DEFAULT, true); 1246 if (f6i) { 1247 if (del_rt) 1248 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 1249 else { 1250 if (!(f6i->fib6_flags & RTF_EXPIRES)) 1251 fib6_set_expires(f6i, expires); 1252 fib6_info_release(f6i); 1253 } 1254 } 1255 } 1256 1257 1258 /* This function wants to get referenced ifp and releases it before return */ 1259 1260 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1261 { 1262 int state; 1263 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1264 unsigned long expires; 1265 1266 ASSERT_RTNL(); 1267 1268 spin_lock_bh(&ifp->lock); 1269 state = ifp->state; 1270 ifp->state = INET6_IFADDR_STATE_DEAD; 1271 spin_unlock_bh(&ifp->lock); 1272 1273 if (state == INET6_IFADDR_STATE_DEAD) 1274 goto out; 1275 1276 spin_lock_bh(&addrconf_hash_lock); 1277 hlist_del_init_rcu(&ifp->addr_lst); 1278 spin_unlock_bh(&addrconf_hash_lock); 1279 1280 write_lock_bh(&ifp->idev->lock); 1281 1282 if (ifp->flags&IFA_F_TEMPORARY) { 1283 list_del(&ifp->tmp_list); 1284 if (ifp->ifpub) { 1285 in6_ifa_put(ifp->ifpub); 1286 ifp->ifpub = NULL; 1287 } 1288 __in6_ifa_put(ifp); 1289 } 1290 1291 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1292 action = check_cleanup_prefix_route(ifp, &expires); 1293 1294 list_del_rcu(&ifp->if_list); 1295 __in6_ifa_put(ifp); 1296 1297 write_unlock_bh(&ifp->idev->lock); 1298 1299 addrconf_del_dad_work(ifp); 1300 1301 ipv6_ifa_notify(RTM_DELADDR, ifp); 1302 1303 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1304 1305 if (action != CLEANUP_PREFIX_RT_NOP) { 1306 cleanup_prefix_route(ifp, expires, 1307 action == CLEANUP_PREFIX_RT_DEL, false); 1308 } 1309 1310 /* clean up prefsrc entries */ 1311 rt6_remove_prefsrc(ifp); 1312 out: 1313 in6_ifa_put(ifp); 1314 } 1315 1316 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block) 1317 { 1318 struct inet6_dev *idev = ifp->idev; 1319 unsigned long tmp_tstamp, age; 1320 unsigned long regen_advance; 1321 unsigned long now = jiffies; 1322 s32 cnf_temp_preferred_lft; 1323 struct inet6_ifaddr *ift; 1324 struct ifa6_config cfg; 1325 long max_desync_factor; 1326 struct in6_addr addr; 1327 int ret = 0; 1328 1329 write_lock_bh(&idev->lock); 1330 1331 retry: 1332 in6_dev_hold(idev); 1333 if (idev->cnf.use_tempaddr <= 0) { 1334 write_unlock_bh(&idev->lock); 1335 pr_info("%s: use_tempaddr is disabled\n", __func__); 1336 in6_dev_put(idev); 1337 ret = -1; 1338 goto out; 1339 } 1340 spin_lock_bh(&ifp->lock); 1341 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1342 idev->cnf.use_tempaddr = -1; /*XXX*/ 1343 spin_unlock_bh(&ifp->lock); 1344 write_unlock_bh(&idev->lock); 1345 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1346 __func__); 1347 in6_dev_put(idev); 1348 ret = -1; 1349 goto out; 1350 } 1351 in6_ifa_hold(ifp); 1352 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1353 ipv6_gen_rnd_iid(&addr); 1354 1355 age = (now - ifp->tstamp) / HZ; 1356 1357 regen_advance = idev->cnf.regen_max_retry * 1358 idev->cnf.dad_transmits * 1359 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 1360 1361 /* recalculate max_desync_factor each time and update 1362 * idev->desync_factor if it's larger 1363 */ 1364 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1365 max_desync_factor = min_t(__u32, 1366 idev->cnf.max_desync_factor, 1367 cnf_temp_preferred_lft - regen_advance); 1368 1369 if (unlikely(idev->desync_factor > max_desync_factor)) { 1370 if (max_desync_factor > 0) { 1371 get_random_bytes(&idev->desync_factor, 1372 sizeof(idev->desync_factor)); 1373 idev->desync_factor %= max_desync_factor; 1374 } else { 1375 idev->desync_factor = 0; 1376 } 1377 } 1378 1379 memset(&cfg, 0, sizeof(cfg)); 1380 cfg.valid_lft = min_t(__u32, ifp->valid_lft, 1381 idev->cnf.temp_valid_lft + age); 1382 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor; 1383 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft); 1384 1385 cfg.plen = ifp->prefix_len; 1386 tmp_tstamp = ifp->tstamp; 1387 spin_unlock_bh(&ifp->lock); 1388 1389 write_unlock_bh(&idev->lock); 1390 1391 /* A temporary address is created only if this calculated Preferred 1392 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1393 * an implementation must not create a temporary address with a zero 1394 * Preferred Lifetime. 1395 * Use age calculation as in addrconf_verify to avoid unnecessary 1396 * temporary addresses being generated. 1397 */ 1398 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1399 if (cfg.preferred_lft <= regen_advance + age) { 1400 in6_ifa_put(ifp); 1401 in6_dev_put(idev); 1402 ret = -1; 1403 goto out; 1404 } 1405 1406 cfg.ifa_flags = IFA_F_TEMPORARY; 1407 /* set in addrconf_prefix_rcv() */ 1408 if (ifp->flags & IFA_F_OPTIMISTIC) 1409 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 1410 1411 cfg.pfx = &addr; 1412 cfg.scope = ipv6_addr_scope(cfg.pfx); 1413 1414 ift = ipv6_add_addr(idev, &cfg, block, NULL); 1415 if (IS_ERR(ift)) { 1416 in6_ifa_put(ifp); 1417 in6_dev_put(idev); 1418 pr_info("%s: retry temporary address regeneration\n", __func__); 1419 write_lock_bh(&idev->lock); 1420 goto retry; 1421 } 1422 1423 spin_lock_bh(&ift->lock); 1424 ift->ifpub = ifp; 1425 ift->cstamp = now; 1426 ift->tstamp = tmp_tstamp; 1427 spin_unlock_bh(&ift->lock); 1428 1429 addrconf_dad_start(ift); 1430 in6_ifa_put(ift); 1431 in6_dev_put(idev); 1432 out: 1433 return ret; 1434 } 1435 1436 /* 1437 * Choose an appropriate source address (RFC3484) 1438 */ 1439 enum { 1440 IPV6_SADDR_RULE_INIT = 0, 1441 IPV6_SADDR_RULE_LOCAL, 1442 IPV6_SADDR_RULE_SCOPE, 1443 IPV6_SADDR_RULE_PREFERRED, 1444 #ifdef CONFIG_IPV6_MIP6 1445 IPV6_SADDR_RULE_HOA, 1446 #endif 1447 IPV6_SADDR_RULE_OIF, 1448 IPV6_SADDR_RULE_LABEL, 1449 IPV6_SADDR_RULE_PRIVACY, 1450 IPV6_SADDR_RULE_ORCHID, 1451 IPV6_SADDR_RULE_PREFIX, 1452 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1453 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1454 #endif 1455 IPV6_SADDR_RULE_MAX 1456 }; 1457 1458 struct ipv6_saddr_score { 1459 int rule; 1460 int addr_type; 1461 struct inet6_ifaddr *ifa; 1462 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1463 int scopedist; 1464 int matchlen; 1465 }; 1466 1467 struct ipv6_saddr_dst { 1468 const struct in6_addr *addr; 1469 int ifindex; 1470 int scope; 1471 int label; 1472 unsigned int prefs; 1473 }; 1474 1475 static inline int ipv6_saddr_preferred(int type) 1476 { 1477 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1478 return 1; 1479 return 0; 1480 } 1481 1482 static bool ipv6_use_optimistic_addr(struct net *net, 1483 struct inet6_dev *idev) 1484 { 1485 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1486 if (!idev) 1487 return false; 1488 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1489 return false; 1490 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic) 1491 return false; 1492 1493 return true; 1494 #else 1495 return false; 1496 #endif 1497 } 1498 1499 static bool ipv6_allow_optimistic_dad(struct net *net, 1500 struct inet6_dev *idev) 1501 { 1502 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1503 if (!idev) 1504 return false; 1505 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1506 return false; 1507 1508 return true; 1509 #else 1510 return false; 1511 #endif 1512 } 1513 1514 static int ipv6_get_saddr_eval(struct net *net, 1515 struct ipv6_saddr_score *score, 1516 struct ipv6_saddr_dst *dst, 1517 int i) 1518 { 1519 int ret; 1520 1521 if (i <= score->rule) { 1522 switch (i) { 1523 case IPV6_SADDR_RULE_SCOPE: 1524 ret = score->scopedist; 1525 break; 1526 case IPV6_SADDR_RULE_PREFIX: 1527 ret = score->matchlen; 1528 break; 1529 default: 1530 ret = !!test_bit(i, score->scorebits); 1531 } 1532 goto out; 1533 } 1534 1535 switch (i) { 1536 case IPV6_SADDR_RULE_INIT: 1537 /* Rule 0: remember if hiscore is not ready yet */ 1538 ret = !!score->ifa; 1539 break; 1540 case IPV6_SADDR_RULE_LOCAL: 1541 /* Rule 1: Prefer same address */ 1542 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1543 break; 1544 case IPV6_SADDR_RULE_SCOPE: 1545 /* Rule 2: Prefer appropriate scope 1546 * 1547 * ret 1548 * ^ 1549 * -1 | d 15 1550 * ---+--+-+---> scope 1551 * | 1552 * | d is scope of the destination. 1553 * B-d | \ 1554 * | \ <- smaller scope is better if 1555 * B-15 | \ if scope is enough for destination. 1556 * | ret = B - scope (-1 <= scope >= d <= 15). 1557 * d-C-1 | / 1558 * |/ <- greater is better 1559 * -C / if scope is not enough for destination. 1560 * /| ret = scope - C (-1 <= d < scope <= 15). 1561 * 1562 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1563 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1564 * Assume B = 0 and we get C > 29. 1565 */ 1566 ret = __ipv6_addr_src_scope(score->addr_type); 1567 if (ret >= dst->scope) 1568 ret = -ret; 1569 else 1570 ret -= 128; /* 30 is enough */ 1571 score->scopedist = ret; 1572 break; 1573 case IPV6_SADDR_RULE_PREFERRED: 1574 { 1575 /* Rule 3: Avoid deprecated and optimistic addresses */ 1576 u8 avoid = IFA_F_DEPRECATED; 1577 1578 if (!ipv6_use_optimistic_addr(net, score->ifa->idev)) 1579 avoid |= IFA_F_OPTIMISTIC; 1580 ret = ipv6_saddr_preferred(score->addr_type) || 1581 !(score->ifa->flags & avoid); 1582 break; 1583 } 1584 #ifdef CONFIG_IPV6_MIP6 1585 case IPV6_SADDR_RULE_HOA: 1586 { 1587 /* Rule 4: Prefer home address */ 1588 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1589 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1590 break; 1591 } 1592 #endif 1593 case IPV6_SADDR_RULE_OIF: 1594 /* Rule 5: Prefer outgoing interface */ 1595 ret = (!dst->ifindex || 1596 dst->ifindex == score->ifa->idev->dev->ifindex); 1597 break; 1598 case IPV6_SADDR_RULE_LABEL: 1599 /* Rule 6: Prefer matching label */ 1600 ret = ipv6_addr_label(net, 1601 &score->ifa->addr, score->addr_type, 1602 score->ifa->idev->dev->ifindex) == dst->label; 1603 break; 1604 case IPV6_SADDR_RULE_PRIVACY: 1605 { 1606 /* Rule 7: Prefer public address 1607 * Note: prefer temporary address if use_tempaddr >= 2 1608 */ 1609 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1610 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1611 score->ifa->idev->cnf.use_tempaddr >= 2; 1612 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1613 break; 1614 } 1615 case IPV6_SADDR_RULE_ORCHID: 1616 /* Rule 8-: Prefer ORCHID vs ORCHID or 1617 * non-ORCHID vs non-ORCHID 1618 */ 1619 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1620 ipv6_addr_orchid(dst->addr)); 1621 break; 1622 case IPV6_SADDR_RULE_PREFIX: 1623 /* Rule 8: Use longest matching prefix */ 1624 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1625 if (ret > score->ifa->prefix_len) 1626 ret = score->ifa->prefix_len; 1627 score->matchlen = ret; 1628 break; 1629 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1630 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1631 /* Optimistic addresses still have lower precedence than other 1632 * preferred addresses. 1633 */ 1634 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1635 break; 1636 #endif 1637 default: 1638 ret = 0; 1639 } 1640 1641 if (ret) 1642 __set_bit(i, score->scorebits); 1643 score->rule = i; 1644 out: 1645 return ret; 1646 } 1647 1648 static int __ipv6_dev_get_saddr(struct net *net, 1649 struct ipv6_saddr_dst *dst, 1650 struct inet6_dev *idev, 1651 struct ipv6_saddr_score *scores, 1652 int hiscore_idx) 1653 { 1654 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1655 1656 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) { 1657 int i; 1658 1659 /* 1660 * - Tentative Address (RFC2462 section 5.4) 1661 * - A tentative address is not considered 1662 * "assigned to an interface" in the traditional 1663 * sense, unless it is also flagged as optimistic. 1664 * - Candidate Source Address (section 4) 1665 * - In any case, anycast addresses, multicast 1666 * addresses, and the unspecified address MUST 1667 * NOT be included in a candidate set. 1668 */ 1669 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1670 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1671 continue; 1672 1673 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1674 1675 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1676 score->addr_type & IPV6_ADDR_MULTICAST)) { 1677 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1678 idev->dev->name); 1679 continue; 1680 } 1681 1682 score->rule = -1; 1683 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1684 1685 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1686 int minihiscore, miniscore; 1687 1688 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1689 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1690 1691 if (minihiscore > miniscore) { 1692 if (i == IPV6_SADDR_RULE_SCOPE && 1693 score->scopedist > 0) { 1694 /* 1695 * special case: 1696 * each remaining entry 1697 * has too small (not enough) 1698 * scope, because ifa entries 1699 * are sorted by their scope 1700 * values. 1701 */ 1702 goto out; 1703 } 1704 break; 1705 } else if (minihiscore < miniscore) { 1706 swap(hiscore, score); 1707 hiscore_idx = 1 - hiscore_idx; 1708 1709 /* restore our iterator */ 1710 score->ifa = hiscore->ifa; 1711 1712 break; 1713 } 1714 } 1715 } 1716 out: 1717 return hiscore_idx; 1718 } 1719 1720 static int ipv6_get_saddr_master(struct net *net, 1721 const struct net_device *dst_dev, 1722 const struct net_device *master, 1723 struct ipv6_saddr_dst *dst, 1724 struct ipv6_saddr_score *scores, 1725 int hiscore_idx) 1726 { 1727 struct inet6_dev *idev; 1728 1729 idev = __in6_dev_get(dst_dev); 1730 if (idev) 1731 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1732 scores, hiscore_idx); 1733 1734 idev = __in6_dev_get(master); 1735 if (idev) 1736 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1737 scores, hiscore_idx); 1738 1739 return hiscore_idx; 1740 } 1741 1742 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1743 const struct in6_addr *daddr, unsigned int prefs, 1744 struct in6_addr *saddr) 1745 { 1746 struct ipv6_saddr_score scores[2], *hiscore; 1747 struct ipv6_saddr_dst dst; 1748 struct inet6_dev *idev; 1749 struct net_device *dev; 1750 int dst_type; 1751 bool use_oif_addr = false; 1752 int hiscore_idx = 0; 1753 int ret = 0; 1754 1755 dst_type = __ipv6_addr_type(daddr); 1756 dst.addr = daddr; 1757 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1758 dst.scope = __ipv6_addr_src_scope(dst_type); 1759 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1760 dst.prefs = prefs; 1761 1762 scores[hiscore_idx].rule = -1; 1763 scores[hiscore_idx].ifa = NULL; 1764 1765 rcu_read_lock(); 1766 1767 /* Candidate Source Address (section 4) 1768 * - multicast and link-local destination address, 1769 * the set of candidate source address MUST only 1770 * include addresses assigned to interfaces 1771 * belonging to the same link as the outgoing 1772 * interface. 1773 * (- For site-local destination addresses, the 1774 * set of candidate source addresses MUST only 1775 * include addresses assigned to interfaces 1776 * belonging to the same site as the outgoing 1777 * interface.) 1778 * - "It is RECOMMENDED that the candidate source addresses 1779 * be the set of unicast addresses assigned to the 1780 * interface that will be used to send to the destination 1781 * (the 'outgoing' interface)." (RFC 6724) 1782 */ 1783 if (dst_dev) { 1784 idev = __in6_dev_get(dst_dev); 1785 if ((dst_type & IPV6_ADDR_MULTICAST) || 1786 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1787 (idev && idev->cnf.use_oif_addrs_only)) { 1788 use_oif_addr = true; 1789 } 1790 } 1791 1792 if (use_oif_addr) { 1793 if (idev) 1794 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1795 } else { 1796 const struct net_device *master; 1797 int master_idx = 0; 1798 1799 /* if dst_dev exists and is enslaved to an L3 device, then 1800 * prefer addresses from dst_dev and then the master over 1801 * any other enslaved devices in the L3 domain. 1802 */ 1803 master = l3mdev_master_dev_rcu(dst_dev); 1804 if (master) { 1805 master_idx = master->ifindex; 1806 1807 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1808 master, &dst, 1809 scores, hiscore_idx); 1810 1811 if (scores[hiscore_idx].ifa) 1812 goto out; 1813 } 1814 1815 for_each_netdev_rcu(net, dev) { 1816 /* only consider addresses on devices in the 1817 * same L3 domain 1818 */ 1819 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1820 continue; 1821 idev = __in6_dev_get(dev); 1822 if (!idev) 1823 continue; 1824 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1825 } 1826 } 1827 1828 out: 1829 hiscore = &scores[hiscore_idx]; 1830 if (!hiscore->ifa) 1831 ret = -EADDRNOTAVAIL; 1832 else 1833 *saddr = hiscore->ifa->addr; 1834 1835 rcu_read_unlock(); 1836 return ret; 1837 } 1838 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1839 1840 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1841 u32 banned_flags) 1842 { 1843 struct inet6_ifaddr *ifp; 1844 int err = -EADDRNOTAVAIL; 1845 1846 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1847 if (ifp->scope > IFA_LINK) 1848 break; 1849 if (ifp->scope == IFA_LINK && 1850 !(ifp->flags & banned_flags)) { 1851 *addr = ifp->addr; 1852 err = 0; 1853 break; 1854 } 1855 } 1856 return err; 1857 } 1858 1859 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1860 u32 banned_flags) 1861 { 1862 struct inet6_dev *idev; 1863 int err = -EADDRNOTAVAIL; 1864 1865 rcu_read_lock(); 1866 idev = __in6_dev_get(dev); 1867 if (idev) { 1868 read_lock_bh(&idev->lock); 1869 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1870 read_unlock_bh(&idev->lock); 1871 } 1872 rcu_read_unlock(); 1873 return err; 1874 } 1875 1876 static int ipv6_count_addresses(const struct inet6_dev *idev) 1877 { 1878 const struct inet6_ifaddr *ifp; 1879 int cnt = 0; 1880 1881 rcu_read_lock(); 1882 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list) 1883 cnt++; 1884 rcu_read_unlock(); 1885 return cnt; 1886 } 1887 1888 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1889 const struct net_device *dev, int strict) 1890 { 1891 return ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1892 strict, IFA_F_TENTATIVE); 1893 } 1894 EXPORT_SYMBOL(ipv6_chk_addr); 1895 1896 /* device argument is used to find the L3 domain of interest. If 1897 * skip_dev_check is set, then the ifp device is not checked against 1898 * the passed in dev argument. So the 2 cases for addresses checks are: 1899 * 1. does the address exist in the L3 domain that dev is part of 1900 * (skip_dev_check = true), or 1901 * 1902 * 2. does the address exist on the specific device 1903 * (skip_dev_check = false) 1904 */ 1905 static struct net_device * 1906 __ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1907 const struct net_device *dev, bool skip_dev_check, 1908 int strict, u32 banned_flags) 1909 { 1910 unsigned int hash = inet6_addr_hash(net, addr); 1911 struct net_device *l3mdev, *ndev; 1912 struct inet6_ifaddr *ifp; 1913 u32 ifp_flags; 1914 1915 rcu_read_lock(); 1916 1917 l3mdev = l3mdev_master_dev_rcu(dev); 1918 if (skip_dev_check) 1919 dev = NULL; 1920 1921 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1922 ndev = ifp->idev->dev; 1923 if (!net_eq(dev_net(ndev), net)) 1924 continue; 1925 1926 if (l3mdev_master_dev_rcu(ndev) != l3mdev) 1927 continue; 1928 1929 /* Decouple optimistic from tentative for evaluation here. 1930 * Ban optimistic addresses explicitly, when required. 1931 */ 1932 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1933 ? (ifp->flags&~IFA_F_TENTATIVE) 1934 : ifp->flags; 1935 if (ipv6_addr_equal(&ifp->addr, addr) && 1936 !(ifp_flags&banned_flags) && 1937 (!dev || ndev == dev || 1938 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1939 rcu_read_unlock(); 1940 return ndev; 1941 } 1942 } 1943 1944 rcu_read_unlock(); 1945 return NULL; 1946 } 1947 1948 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1949 const struct net_device *dev, bool skip_dev_check, 1950 int strict, u32 banned_flags) 1951 { 1952 return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check, 1953 strict, banned_flags) ? 1 : 0; 1954 } 1955 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1956 1957 1958 /* Compares an address/prefix_len with addresses on device @dev. 1959 * If one is found it returns true. 1960 */ 1961 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1962 const unsigned int prefix_len, struct net_device *dev) 1963 { 1964 const struct inet6_ifaddr *ifa; 1965 const struct inet6_dev *idev; 1966 bool ret = false; 1967 1968 rcu_read_lock(); 1969 idev = __in6_dev_get(dev); 1970 if (idev) { 1971 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1972 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1973 if (ret) 1974 break; 1975 } 1976 } 1977 rcu_read_unlock(); 1978 1979 return ret; 1980 } 1981 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1982 1983 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1984 { 1985 const struct inet6_ifaddr *ifa; 1986 const struct inet6_dev *idev; 1987 int onlink; 1988 1989 onlink = 0; 1990 rcu_read_lock(); 1991 idev = __in6_dev_get(dev); 1992 if (idev) { 1993 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1994 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1995 ifa->prefix_len); 1996 if (onlink) 1997 break; 1998 } 1999 } 2000 rcu_read_unlock(); 2001 return onlink; 2002 } 2003 EXPORT_SYMBOL(ipv6_chk_prefix); 2004 2005 /** 2006 * ipv6_dev_find - find the first device with a given source address. 2007 * @net: the net namespace 2008 * @addr: the source address 2009 * @dev: used to find the L3 domain of interest 2010 * 2011 * The caller should be protected by RCU, or RTNL. 2012 */ 2013 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr, 2014 struct net_device *dev) 2015 { 2016 return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1, 2017 IFA_F_TENTATIVE); 2018 } 2019 EXPORT_SYMBOL(ipv6_dev_find); 2020 2021 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 2022 struct net_device *dev, int strict) 2023 { 2024 unsigned int hash = inet6_addr_hash(net, addr); 2025 struct inet6_ifaddr *ifp, *result = NULL; 2026 2027 rcu_read_lock(); 2028 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 2029 if (!net_eq(dev_net(ifp->idev->dev), net)) 2030 continue; 2031 if (ipv6_addr_equal(&ifp->addr, addr)) { 2032 if (!dev || ifp->idev->dev == dev || 2033 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 2034 result = ifp; 2035 in6_ifa_hold(ifp); 2036 break; 2037 } 2038 } 2039 } 2040 rcu_read_unlock(); 2041 2042 return result; 2043 } 2044 2045 /* Gets referenced address, destroys ifaddr */ 2046 2047 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 2048 { 2049 if (dad_failed) 2050 ifp->flags |= IFA_F_DADFAILED; 2051 2052 if (ifp->flags&IFA_F_TEMPORARY) { 2053 struct inet6_ifaddr *ifpub; 2054 spin_lock_bh(&ifp->lock); 2055 ifpub = ifp->ifpub; 2056 if (ifpub) { 2057 in6_ifa_hold(ifpub); 2058 spin_unlock_bh(&ifp->lock); 2059 ipv6_create_tempaddr(ifpub, true); 2060 in6_ifa_put(ifpub); 2061 } else { 2062 spin_unlock_bh(&ifp->lock); 2063 } 2064 ipv6_del_addr(ifp); 2065 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) { 2066 spin_lock_bh(&ifp->lock); 2067 addrconf_del_dad_work(ifp); 2068 ifp->flags |= IFA_F_TENTATIVE; 2069 if (dad_failed) 2070 ifp->flags &= ~IFA_F_OPTIMISTIC; 2071 spin_unlock_bh(&ifp->lock); 2072 if (dad_failed) 2073 ipv6_ifa_notify(0, ifp); 2074 in6_ifa_put(ifp); 2075 } else { 2076 ipv6_del_addr(ifp); 2077 } 2078 } 2079 2080 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 2081 { 2082 int err = -ENOENT; 2083 2084 spin_lock_bh(&ifp->lock); 2085 if (ifp->state == INET6_IFADDR_STATE_DAD) { 2086 ifp->state = INET6_IFADDR_STATE_POSTDAD; 2087 err = 0; 2088 } 2089 spin_unlock_bh(&ifp->lock); 2090 2091 return err; 2092 } 2093 2094 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp) 2095 { 2096 struct inet6_dev *idev = ifp->idev; 2097 struct net *net = dev_net(ifp->idev->dev); 2098 2099 if (addrconf_dad_end(ifp)) { 2100 in6_ifa_put(ifp); 2101 return; 2102 } 2103 2104 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n", 2105 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source); 2106 2107 spin_lock_bh(&ifp->lock); 2108 2109 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 2110 struct in6_addr new_addr; 2111 struct inet6_ifaddr *ifp2; 2112 int retries = ifp->stable_privacy_retry + 1; 2113 struct ifa6_config cfg = { 2114 .pfx = &new_addr, 2115 .plen = ifp->prefix_len, 2116 .ifa_flags = ifp->flags, 2117 .valid_lft = ifp->valid_lft, 2118 .preferred_lft = ifp->prefered_lft, 2119 .scope = ifp->scope, 2120 }; 2121 2122 if (retries > net->ipv6.sysctl.idgen_retries) { 2123 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 2124 ifp->idev->dev->name); 2125 goto errdad; 2126 } 2127 2128 new_addr = ifp->addr; 2129 if (ipv6_generate_stable_address(&new_addr, retries, 2130 idev)) 2131 goto errdad; 2132 2133 spin_unlock_bh(&ifp->lock); 2134 2135 if (idev->cnf.max_addresses && 2136 ipv6_count_addresses(idev) >= 2137 idev->cnf.max_addresses) 2138 goto lock_errdad; 2139 2140 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 2141 ifp->idev->dev->name); 2142 2143 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL); 2144 if (IS_ERR(ifp2)) 2145 goto lock_errdad; 2146 2147 spin_lock_bh(&ifp2->lock); 2148 ifp2->stable_privacy_retry = retries; 2149 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2150 spin_unlock_bh(&ifp2->lock); 2151 2152 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2153 in6_ifa_put(ifp2); 2154 lock_errdad: 2155 spin_lock_bh(&ifp->lock); 2156 } 2157 2158 errdad: 2159 /* transition from _POSTDAD to _ERRDAD */ 2160 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2161 spin_unlock_bh(&ifp->lock); 2162 2163 addrconf_mod_dad_work(ifp, 0); 2164 in6_ifa_put(ifp); 2165 } 2166 2167 /* Join to solicited addr multicast group. 2168 * caller must hold RTNL */ 2169 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2170 { 2171 struct in6_addr maddr; 2172 2173 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2174 return; 2175 2176 addrconf_addr_solict_mult(addr, &maddr); 2177 ipv6_dev_mc_inc(dev, &maddr); 2178 } 2179 2180 /* caller must hold RTNL */ 2181 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2182 { 2183 struct in6_addr maddr; 2184 2185 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2186 return; 2187 2188 addrconf_addr_solict_mult(addr, &maddr); 2189 __ipv6_dev_mc_dec(idev, &maddr); 2190 } 2191 2192 /* caller must hold RTNL */ 2193 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2194 { 2195 struct in6_addr addr; 2196 2197 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2198 return; 2199 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2200 if (ipv6_addr_any(&addr)) 2201 return; 2202 __ipv6_dev_ac_inc(ifp->idev, &addr); 2203 } 2204 2205 /* caller must hold RTNL */ 2206 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2207 { 2208 struct in6_addr addr; 2209 2210 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2211 return; 2212 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2213 if (ipv6_addr_any(&addr)) 2214 return; 2215 __ipv6_dev_ac_dec(ifp->idev, &addr); 2216 } 2217 2218 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2219 { 2220 switch (dev->addr_len) { 2221 case ETH_ALEN: 2222 memcpy(eui, dev->dev_addr, 3); 2223 eui[3] = 0xFF; 2224 eui[4] = 0xFE; 2225 memcpy(eui + 5, dev->dev_addr + 3, 3); 2226 break; 2227 case EUI64_ADDR_LEN: 2228 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2229 eui[0] ^= 2; 2230 break; 2231 default: 2232 return -1; 2233 } 2234 2235 return 0; 2236 } 2237 2238 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2239 { 2240 union fwnet_hwaddr *ha; 2241 2242 if (dev->addr_len != FWNET_ALEN) 2243 return -1; 2244 2245 ha = (union fwnet_hwaddr *)dev->dev_addr; 2246 2247 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2248 eui[0] ^= 2; 2249 return 0; 2250 } 2251 2252 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2253 { 2254 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2255 if (dev->addr_len != ARCNET_ALEN) 2256 return -1; 2257 memset(eui, 0, 7); 2258 eui[7] = *(u8 *)dev->dev_addr; 2259 return 0; 2260 } 2261 2262 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2263 { 2264 if (dev->addr_len != INFINIBAND_ALEN) 2265 return -1; 2266 memcpy(eui, dev->dev_addr + 12, 8); 2267 eui[0] |= 2; 2268 return 0; 2269 } 2270 2271 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2272 { 2273 if (addr == 0) 2274 return -1; 2275 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2276 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2277 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2278 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2279 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2280 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2281 eui[1] = 0; 2282 eui[2] = 0x5E; 2283 eui[3] = 0xFE; 2284 memcpy(eui + 4, &addr, 4); 2285 return 0; 2286 } 2287 2288 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2289 { 2290 if (dev->priv_flags & IFF_ISATAP) 2291 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2292 return -1; 2293 } 2294 2295 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2296 { 2297 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2298 } 2299 2300 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2301 { 2302 memcpy(eui, dev->perm_addr, 3); 2303 memcpy(eui + 5, dev->perm_addr + 3, 3); 2304 eui[3] = 0xFF; 2305 eui[4] = 0xFE; 2306 eui[0] ^= 2; 2307 return 0; 2308 } 2309 2310 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2311 { 2312 switch (dev->type) { 2313 case ARPHRD_ETHER: 2314 case ARPHRD_FDDI: 2315 return addrconf_ifid_eui48(eui, dev); 2316 case ARPHRD_ARCNET: 2317 return addrconf_ifid_arcnet(eui, dev); 2318 case ARPHRD_INFINIBAND: 2319 return addrconf_ifid_infiniband(eui, dev); 2320 case ARPHRD_SIT: 2321 return addrconf_ifid_sit(eui, dev); 2322 case ARPHRD_IPGRE: 2323 case ARPHRD_TUNNEL: 2324 return addrconf_ifid_gre(eui, dev); 2325 case ARPHRD_6LOWPAN: 2326 return addrconf_ifid_6lowpan(eui, dev); 2327 case ARPHRD_IEEE1394: 2328 return addrconf_ifid_ieee1394(eui, dev); 2329 case ARPHRD_TUNNEL6: 2330 case ARPHRD_IP6GRE: 2331 case ARPHRD_RAWIP: 2332 return addrconf_ifid_ip6tnl(eui, dev); 2333 } 2334 return -1; 2335 } 2336 2337 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2338 { 2339 int err = -1; 2340 struct inet6_ifaddr *ifp; 2341 2342 read_lock_bh(&idev->lock); 2343 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2344 if (ifp->scope > IFA_LINK) 2345 break; 2346 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2347 memcpy(eui, ifp->addr.s6_addr+8, 8); 2348 err = 0; 2349 break; 2350 } 2351 } 2352 read_unlock_bh(&idev->lock); 2353 return err; 2354 } 2355 2356 /* Generation of a randomized Interface Identifier 2357 * draft-ietf-6man-rfc4941bis, Section 3.3.1 2358 */ 2359 2360 static void ipv6_gen_rnd_iid(struct in6_addr *addr) 2361 { 2362 regen: 2363 get_random_bytes(&addr->s6_addr[8], 8); 2364 2365 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1: 2366 * check if generated address is not inappropriate: 2367 * 2368 * - Reserved IPv6 Interface Identifiers 2369 * - XXX: already assigned to an address on the device 2370 */ 2371 2372 /* Subnet-router anycast: 0000:0000:0000:0000 */ 2373 if (!(addr->s6_addr32[2] | addr->s6_addr32[3])) 2374 goto regen; 2375 2376 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212 2377 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213 2378 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF 2379 */ 2380 if (ntohl(addr->s6_addr32[2]) == 0x02005eff && 2381 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000) 2382 goto regen; 2383 2384 /* Reserved subnet anycast addresses */ 2385 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff && 2386 ntohl(addr->s6_addr32[3]) >= 0Xffffff80) 2387 goto regen; 2388 } 2389 2390 /* 2391 * Add prefix route. 2392 */ 2393 2394 static void 2395 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric, 2396 struct net_device *dev, unsigned long expires, 2397 u32 flags, gfp_t gfp_flags) 2398 { 2399 struct fib6_config cfg = { 2400 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2401 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF, 2402 .fc_ifindex = dev->ifindex, 2403 .fc_expires = expires, 2404 .fc_dst_len = plen, 2405 .fc_flags = RTF_UP | flags, 2406 .fc_nlinfo.nl_net = dev_net(dev), 2407 .fc_protocol = RTPROT_KERNEL, 2408 .fc_type = RTN_UNICAST, 2409 }; 2410 2411 cfg.fc_dst = *pfx; 2412 2413 /* Prevent useless cloning on PtP SIT. 2414 This thing is done here expecting that the whole 2415 class of non-broadcast devices need not cloning. 2416 */ 2417 #if IS_ENABLED(CONFIG_IPV6_SIT) 2418 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2419 cfg.fc_flags |= RTF_NONEXTHOP; 2420 #endif 2421 2422 ip6_route_add(&cfg, gfp_flags, NULL); 2423 } 2424 2425 2426 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2427 int plen, 2428 const struct net_device *dev, 2429 u32 flags, u32 noflags, 2430 bool no_gw) 2431 { 2432 struct fib6_node *fn; 2433 struct fib6_info *rt = NULL; 2434 struct fib6_table *table; 2435 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2436 2437 table = fib6_get_table(dev_net(dev), tb_id); 2438 if (!table) 2439 return NULL; 2440 2441 rcu_read_lock(); 2442 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true); 2443 if (!fn) 2444 goto out; 2445 2446 for_each_fib6_node_rt_rcu(fn) { 2447 /* prefix routes only use builtin fib6_nh */ 2448 if (rt->nh) 2449 continue; 2450 2451 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex) 2452 continue; 2453 if (no_gw && rt->fib6_nh->fib_nh_gw_family) 2454 continue; 2455 if ((rt->fib6_flags & flags) != flags) 2456 continue; 2457 if ((rt->fib6_flags & noflags) != 0) 2458 continue; 2459 if (!fib6_info_hold_safe(rt)) 2460 continue; 2461 break; 2462 } 2463 out: 2464 rcu_read_unlock(); 2465 return rt; 2466 } 2467 2468 2469 /* Create "default" multicast route to the interface */ 2470 2471 static void addrconf_add_mroute(struct net_device *dev) 2472 { 2473 struct fib6_config cfg = { 2474 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2475 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2476 .fc_ifindex = dev->ifindex, 2477 .fc_dst_len = 8, 2478 .fc_flags = RTF_UP, 2479 .fc_type = RTN_MULTICAST, 2480 .fc_nlinfo.nl_net = dev_net(dev), 2481 .fc_protocol = RTPROT_KERNEL, 2482 }; 2483 2484 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2485 2486 ip6_route_add(&cfg, GFP_KERNEL, NULL); 2487 } 2488 2489 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2490 { 2491 struct inet6_dev *idev; 2492 2493 ASSERT_RTNL(); 2494 2495 idev = ipv6_find_idev(dev); 2496 if (IS_ERR(idev)) 2497 return idev; 2498 2499 if (idev->cnf.disable_ipv6) 2500 return ERR_PTR(-EACCES); 2501 2502 /* Add default multicast route */ 2503 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2504 addrconf_add_mroute(dev); 2505 2506 return idev; 2507 } 2508 2509 static void manage_tempaddrs(struct inet6_dev *idev, 2510 struct inet6_ifaddr *ifp, 2511 __u32 valid_lft, __u32 prefered_lft, 2512 bool create, unsigned long now) 2513 { 2514 u32 flags; 2515 struct inet6_ifaddr *ift; 2516 2517 read_lock_bh(&idev->lock); 2518 /* update all temporary addresses in the list */ 2519 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2520 int age, max_valid, max_prefered; 2521 2522 if (ifp != ift->ifpub) 2523 continue; 2524 2525 /* RFC 4941 section 3.3: 2526 * If a received option will extend the lifetime of a public 2527 * address, the lifetimes of temporary addresses should 2528 * be extended, subject to the overall constraint that no 2529 * temporary addresses should ever remain "valid" or "preferred" 2530 * for a time longer than (TEMP_VALID_LIFETIME) or 2531 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2532 */ 2533 age = (now - ift->cstamp) / HZ; 2534 max_valid = idev->cnf.temp_valid_lft - age; 2535 if (max_valid < 0) 2536 max_valid = 0; 2537 2538 max_prefered = idev->cnf.temp_prefered_lft - 2539 idev->desync_factor - age; 2540 if (max_prefered < 0) 2541 max_prefered = 0; 2542 2543 if (valid_lft > max_valid) 2544 valid_lft = max_valid; 2545 2546 if (prefered_lft > max_prefered) 2547 prefered_lft = max_prefered; 2548 2549 spin_lock(&ift->lock); 2550 flags = ift->flags; 2551 ift->valid_lft = valid_lft; 2552 ift->prefered_lft = prefered_lft; 2553 ift->tstamp = now; 2554 if (prefered_lft > 0) 2555 ift->flags &= ~IFA_F_DEPRECATED; 2556 2557 spin_unlock(&ift->lock); 2558 if (!(flags&IFA_F_TENTATIVE)) 2559 ipv6_ifa_notify(0, ift); 2560 } 2561 2562 if ((create || list_empty(&idev->tempaddr_list)) && 2563 idev->cnf.use_tempaddr > 0) { 2564 /* When a new public address is created as described 2565 * in [ADDRCONF], also create a new temporary address. 2566 * Also create a temporary address if it's enabled but 2567 * no temporary address currently exists. 2568 */ 2569 read_unlock_bh(&idev->lock); 2570 ipv6_create_tempaddr(ifp, false); 2571 } else { 2572 read_unlock_bh(&idev->lock); 2573 } 2574 } 2575 2576 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2577 { 2578 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2579 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2580 } 2581 2582 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2583 const struct prefix_info *pinfo, 2584 struct inet6_dev *in6_dev, 2585 const struct in6_addr *addr, int addr_type, 2586 u32 addr_flags, bool sllao, bool tokenized, 2587 __u32 valid_lft, u32 prefered_lft) 2588 { 2589 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2590 int create = 0; 2591 2592 if (!ifp && valid_lft) { 2593 int max_addresses = in6_dev->cnf.max_addresses; 2594 struct ifa6_config cfg = { 2595 .pfx = addr, 2596 .plen = pinfo->prefix_len, 2597 .ifa_flags = addr_flags, 2598 .valid_lft = valid_lft, 2599 .preferred_lft = prefered_lft, 2600 .scope = addr_type & IPV6_ADDR_SCOPE_MASK, 2601 }; 2602 2603 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2604 if ((net->ipv6.devconf_all->optimistic_dad || 2605 in6_dev->cnf.optimistic_dad) && 2606 !net->ipv6.devconf_all->forwarding && sllao) 2607 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 2608 #endif 2609 2610 /* Do not allow to create too much of autoconfigured 2611 * addresses; this would be too easy way to crash kernel. 2612 */ 2613 if (!max_addresses || 2614 ipv6_count_addresses(in6_dev) < max_addresses) 2615 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL); 2616 2617 if (IS_ERR_OR_NULL(ifp)) 2618 return -1; 2619 2620 create = 1; 2621 spin_lock_bh(&ifp->lock); 2622 ifp->flags |= IFA_F_MANAGETEMPADDR; 2623 ifp->cstamp = jiffies; 2624 ifp->tokenized = tokenized; 2625 spin_unlock_bh(&ifp->lock); 2626 addrconf_dad_start(ifp); 2627 } 2628 2629 if (ifp) { 2630 u32 flags; 2631 unsigned long now; 2632 u32 stored_lft; 2633 2634 /* Update lifetime (RFC4862 5.5.3 e) 2635 * We deviate from RFC4862 by honoring all Valid Lifetimes to 2636 * improve the reaction of SLAAC to renumbering events 2637 * (draft-gont-6man-slaac-renum-06, Section 4.2) 2638 */ 2639 spin_lock_bh(&ifp->lock); 2640 now = jiffies; 2641 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2642 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2643 else 2644 stored_lft = 0; 2645 2646 if (!create && stored_lft) { 2647 ifp->valid_lft = valid_lft; 2648 ifp->prefered_lft = prefered_lft; 2649 ifp->tstamp = now; 2650 flags = ifp->flags; 2651 ifp->flags &= ~IFA_F_DEPRECATED; 2652 spin_unlock_bh(&ifp->lock); 2653 2654 if (!(flags&IFA_F_TENTATIVE)) 2655 ipv6_ifa_notify(0, ifp); 2656 } else 2657 spin_unlock_bh(&ifp->lock); 2658 2659 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2660 create, now); 2661 2662 in6_ifa_put(ifp); 2663 addrconf_verify(); 2664 } 2665 2666 return 0; 2667 } 2668 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2669 2670 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2671 { 2672 struct prefix_info *pinfo; 2673 __u32 valid_lft; 2674 __u32 prefered_lft; 2675 int addr_type, err; 2676 u32 addr_flags = 0; 2677 struct inet6_dev *in6_dev; 2678 struct net *net = dev_net(dev); 2679 2680 pinfo = (struct prefix_info *) opt; 2681 2682 if (len < sizeof(struct prefix_info)) { 2683 netdev_dbg(dev, "addrconf: prefix option too short\n"); 2684 return; 2685 } 2686 2687 /* 2688 * Validation checks ([ADDRCONF], page 19) 2689 */ 2690 2691 addr_type = ipv6_addr_type(&pinfo->prefix); 2692 2693 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2694 return; 2695 2696 valid_lft = ntohl(pinfo->valid); 2697 prefered_lft = ntohl(pinfo->prefered); 2698 2699 if (prefered_lft > valid_lft) { 2700 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2701 return; 2702 } 2703 2704 in6_dev = in6_dev_get(dev); 2705 2706 if (!in6_dev) { 2707 net_dbg_ratelimited("addrconf: device %s not configured\n", 2708 dev->name); 2709 return; 2710 } 2711 2712 /* 2713 * Two things going on here: 2714 * 1) Add routes for on-link prefixes 2715 * 2) Configure prefixes with the auto flag set 2716 */ 2717 2718 if (pinfo->onlink) { 2719 struct fib6_info *rt; 2720 unsigned long rt_expires; 2721 2722 /* Avoid arithmetic overflow. Really, we could 2723 * save rt_expires in seconds, likely valid_lft, 2724 * but it would require division in fib gc, that it 2725 * not good. 2726 */ 2727 if (HZ > USER_HZ) 2728 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2729 else 2730 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2731 2732 if (addrconf_finite_timeout(rt_expires)) 2733 rt_expires *= HZ; 2734 2735 rt = addrconf_get_prefix_route(&pinfo->prefix, 2736 pinfo->prefix_len, 2737 dev, 2738 RTF_ADDRCONF | RTF_PREFIX_RT, 2739 RTF_DEFAULT, true); 2740 2741 if (rt) { 2742 /* Autoconf prefix route */ 2743 if (valid_lft == 0) { 2744 ip6_del_rt(net, rt, false); 2745 rt = NULL; 2746 } else if (addrconf_finite_timeout(rt_expires)) { 2747 /* not infinity */ 2748 fib6_set_expires(rt, jiffies + rt_expires); 2749 } else { 2750 fib6_clean_expires(rt); 2751 } 2752 } else if (valid_lft) { 2753 clock_t expires = 0; 2754 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2755 if (addrconf_finite_timeout(rt_expires)) { 2756 /* not infinity */ 2757 flags |= RTF_EXPIRES; 2758 expires = jiffies_to_clock_t(rt_expires); 2759 } 2760 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2761 0, dev, expires, flags, 2762 GFP_ATOMIC); 2763 } 2764 fib6_info_release(rt); 2765 } 2766 2767 /* Try to figure out our local address for this prefix */ 2768 2769 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2770 struct in6_addr addr; 2771 bool tokenized = false, dev_addr_generated = false; 2772 2773 if (pinfo->prefix_len == 64) { 2774 memcpy(&addr, &pinfo->prefix, 8); 2775 2776 if (!ipv6_addr_any(&in6_dev->token)) { 2777 read_lock_bh(&in6_dev->lock); 2778 memcpy(addr.s6_addr + 8, 2779 in6_dev->token.s6_addr + 8, 8); 2780 read_unlock_bh(&in6_dev->lock); 2781 tokenized = true; 2782 } else if (is_addr_mode_generate_stable(in6_dev) && 2783 !ipv6_generate_stable_address(&addr, 0, 2784 in6_dev)) { 2785 addr_flags |= IFA_F_STABLE_PRIVACY; 2786 goto ok; 2787 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2788 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2789 goto put; 2790 } else { 2791 dev_addr_generated = true; 2792 } 2793 goto ok; 2794 } 2795 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2796 pinfo->prefix_len); 2797 goto put; 2798 2799 ok: 2800 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2801 &addr, addr_type, 2802 addr_flags, sllao, 2803 tokenized, valid_lft, 2804 prefered_lft); 2805 if (err) 2806 goto put; 2807 2808 /* Ignore error case here because previous prefix add addr was 2809 * successful which will be notified. 2810 */ 2811 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2812 addr_type, addr_flags, sllao, 2813 tokenized, valid_lft, 2814 prefered_lft, 2815 dev_addr_generated); 2816 } 2817 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2818 put: 2819 in6_dev_put(in6_dev); 2820 } 2821 2822 static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev, 2823 struct in6_ifreq *ireq) 2824 { 2825 struct ip_tunnel_parm p = { }; 2826 int err; 2827 2828 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4)) 2829 return -EADDRNOTAVAIL; 2830 2831 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3]; 2832 p.iph.version = 4; 2833 p.iph.ihl = 5; 2834 p.iph.protocol = IPPROTO_IPV6; 2835 p.iph.ttl = 64; 2836 2837 if (!dev->netdev_ops->ndo_tunnel_ctl) 2838 return -EOPNOTSUPP; 2839 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL); 2840 if (err) 2841 return err; 2842 2843 dev = __dev_get_by_name(net, p.name); 2844 if (!dev) 2845 return -ENOBUFS; 2846 return dev_open(dev, NULL); 2847 } 2848 2849 /* 2850 * Set destination address. 2851 * Special case for SIT interfaces where we create a new "virtual" 2852 * device. 2853 */ 2854 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2855 { 2856 struct net_device *dev; 2857 struct in6_ifreq ireq; 2858 int err = -ENODEV; 2859 2860 if (!IS_ENABLED(CONFIG_IPV6_SIT)) 2861 return -ENODEV; 2862 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2863 return -EFAULT; 2864 2865 rtnl_lock(); 2866 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2867 if (dev && dev->type == ARPHRD_SIT) 2868 err = addrconf_set_sit_dstaddr(net, dev, &ireq); 2869 rtnl_unlock(); 2870 return err; 2871 } 2872 2873 static int ipv6_mc_config(struct sock *sk, bool join, 2874 const struct in6_addr *addr, int ifindex) 2875 { 2876 int ret; 2877 2878 ASSERT_RTNL(); 2879 2880 lock_sock(sk); 2881 if (join) 2882 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2883 else 2884 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2885 release_sock(sk); 2886 2887 return ret; 2888 } 2889 2890 /* 2891 * Manual configuration of address on an interface 2892 */ 2893 static int inet6_addr_add(struct net *net, int ifindex, 2894 struct ifa6_config *cfg, 2895 struct netlink_ext_ack *extack) 2896 { 2897 struct inet6_ifaddr *ifp; 2898 struct inet6_dev *idev; 2899 struct net_device *dev; 2900 unsigned long timeout; 2901 clock_t expires; 2902 u32 flags; 2903 2904 ASSERT_RTNL(); 2905 2906 if (cfg->plen > 128) 2907 return -EINVAL; 2908 2909 /* check the lifetime */ 2910 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 2911 return -EINVAL; 2912 2913 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) 2914 return -EINVAL; 2915 2916 dev = __dev_get_by_index(net, ifindex); 2917 if (!dev) 2918 return -ENODEV; 2919 2920 idev = addrconf_add_dev(dev); 2921 if (IS_ERR(idev)) 2922 return PTR_ERR(idev); 2923 2924 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2925 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2926 true, cfg->pfx, ifindex); 2927 2928 if (ret < 0) 2929 return ret; 2930 } 2931 2932 cfg->scope = ipv6_addr_scope(cfg->pfx); 2933 2934 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 2935 if (addrconf_finite_timeout(timeout)) { 2936 expires = jiffies_to_clock_t(timeout * HZ); 2937 cfg->valid_lft = timeout; 2938 flags = RTF_EXPIRES; 2939 } else { 2940 expires = 0; 2941 flags = 0; 2942 cfg->ifa_flags |= IFA_F_PERMANENT; 2943 } 2944 2945 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 2946 if (addrconf_finite_timeout(timeout)) { 2947 if (timeout == 0) 2948 cfg->ifa_flags |= IFA_F_DEPRECATED; 2949 cfg->preferred_lft = timeout; 2950 } 2951 2952 ifp = ipv6_add_addr(idev, cfg, true, extack); 2953 if (!IS_ERR(ifp)) { 2954 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 2955 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 2956 ifp->rt_priority, dev, expires, 2957 flags, GFP_KERNEL); 2958 } 2959 2960 /* Send a netlink notification if DAD is enabled and 2961 * optimistic flag is not set 2962 */ 2963 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD))) 2964 ipv6_ifa_notify(0, ifp); 2965 /* 2966 * Note that section 3.1 of RFC 4429 indicates 2967 * that the Optimistic flag should not be set for 2968 * manually configured addresses 2969 */ 2970 addrconf_dad_start(ifp); 2971 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR) 2972 manage_tempaddrs(idev, ifp, cfg->valid_lft, 2973 cfg->preferred_lft, true, jiffies); 2974 in6_ifa_put(ifp); 2975 addrconf_verify_rtnl(); 2976 return 0; 2977 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2978 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false, 2979 cfg->pfx, ifindex); 2980 } 2981 2982 return PTR_ERR(ifp); 2983 } 2984 2985 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2986 const struct in6_addr *pfx, unsigned int plen) 2987 { 2988 struct inet6_ifaddr *ifp; 2989 struct inet6_dev *idev; 2990 struct net_device *dev; 2991 2992 if (plen > 128) 2993 return -EINVAL; 2994 2995 dev = __dev_get_by_index(net, ifindex); 2996 if (!dev) 2997 return -ENODEV; 2998 2999 idev = __in6_dev_get(dev); 3000 if (!idev) 3001 return -ENXIO; 3002 3003 read_lock_bh(&idev->lock); 3004 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3005 if (ifp->prefix_len == plen && 3006 ipv6_addr_equal(pfx, &ifp->addr)) { 3007 in6_ifa_hold(ifp); 3008 read_unlock_bh(&idev->lock); 3009 3010 if (!(ifp->flags & IFA_F_TEMPORARY) && 3011 (ifa_flags & IFA_F_MANAGETEMPADDR)) 3012 manage_tempaddrs(idev, ifp, 0, 0, false, 3013 jiffies); 3014 ipv6_del_addr(ifp); 3015 addrconf_verify_rtnl(); 3016 if (ipv6_addr_is_multicast(pfx)) { 3017 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 3018 false, pfx, dev->ifindex); 3019 } 3020 return 0; 3021 } 3022 } 3023 read_unlock_bh(&idev->lock); 3024 return -EADDRNOTAVAIL; 3025 } 3026 3027 3028 int addrconf_add_ifaddr(struct net *net, void __user *arg) 3029 { 3030 struct ifa6_config cfg = { 3031 .ifa_flags = IFA_F_PERMANENT, 3032 .preferred_lft = INFINITY_LIFE_TIME, 3033 .valid_lft = INFINITY_LIFE_TIME, 3034 }; 3035 struct in6_ifreq ireq; 3036 int err; 3037 3038 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3039 return -EPERM; 3040 3041 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3042 return -EFAULT; 3043 3044 cfg.pfx = &ireq.ifr6_addr; 3045 cfg.plen = ireq.ifr6_prefixlen; 3046 3047 rtnl_lock(); 3048 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL); 3049 rtnl_unlock(); 3050 return err; 3051 } 3052 3053 int addrconf_del_ifaddr(struct net *net, void __user *arg) 3054 { 3055 struct in6_ifreq ireq; 3056 int err; 3057 3058 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3059 return -EPERM; 3060 3061 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3062 return -EFAULT; 3063 3064 rtnl_lock(); 3065 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 3066 ireq.ifr6_prefixlen); 3067 rtnl_unlock(); 3068 return err; 3069 } 3070 3071 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 3072 int plen, int scope) 3073 { 3074 struct inet6_ifaddr *ifp; 3075 struct ifa6_config cfg = { 3076 .pfx = addr, 3077 .plen = plen, 3078 .ifa_flags = IFA_F_PERMANENT, 3079 .valid_lft = INFINITY_LIFE_TIME, 3080 .preferred_lft = INFINITY_LIFE_TIME, 3081 .scope = scope 3082 }; 3083 3084 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3085 if (!IS_ERR(ifp)) { 3086 spin_lock_bh(&ifp->lock); 3087 ifp->flags &= ~IFA_F_TENTATIVE; 3088 spin_unlock_bh(&ifp->lock); 3089 rt_genid_bump_ipv6(dev_net(idev->dev)); 3090 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3091 in6_ifa_put(ifp); 3092 } 3093 } 3094 3095 #if IS_ENABLED(CONFIG_IPV6_SIT) 3096 static void sit_add_v4_addrs(struct inet6_dev *idev) 3097 { 3098 struct in6_addr addr; 3099 struct net_device *dev; 3100 struct net *net = dev_net(idev->dev); 3101 int scope, plen; 3102 u32 pflags = 0; 3103 3104 ASSERT_RTNL(); 3105 3106 memset(&addr, 0, sizeof(struct in6_addr)); 3107 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 3108 3109 if (idev->dev->flags&IFF_POINTOPOINT) { 3110 addr.s6_addr32[0] = htonl(0xfe800000); 3111 scope = IFA_LINK; 3112 plen = 64; 3113 } else { 3114 scope = IPV6_ADDR_COMPATv4; 3115 plen = 96; 3116 pflags |= RTF_NONEXTHOP; 3117 } 3118 3119 if (addr.s6_addr32[3]) { 3120 add_addr(idev, &addr, plen, scope); 3121 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags, 3122 GFP_KERNEL); 3123 return; 3124 } 3125 3126 for_each_netdev(net, dev) { 3127 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3128 if (in_dev && (dev->flags & IFF_UP)) { 3129 struct in_ifaddr *ifa; 3130 int flag = scope; 3131 3132 in_dev_for_each_ifa_rtnl(ifa, in_dev) { 3133 addr.s6_addr32[3] = ifa->ifa_local; 3134 3135 if (ifa->ifa_scope == RT_SCOPE_LINK) 3136 continue; 3137 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3138 if (idev->dev->flags&IFF_POINTOPOINT) 3139 continue; 3140 flag |= IFA_HOST; 3141 } 3142 3143 add_addr(idev, &addr, plen, flag); 3144 addrconf_prefix_route(&addr, plen, 0, idev->dev, 3145 0, pflags, GFP_KERNEL); 3146 } 3147 } 3148 } 3149 } 3150 #endif 3151 3152 static void init_loopback(struct net_device *dev) 3153 { 3154 struct inet6_dev *idev; 3155 3156 /* ::1 */ 3157 3158 ASSERT_RTNL(); 3159 3160 idev = ipv6_find_idev(dev); 3161 if (IS_ERR(idev)) { 3162 pr_debug("%s: add_dev failed\n", __func__); 3163 return; 3164 } 3165 3166 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 3167 } 3168 3169 void addrconf_add_linklocal(struct inet6_dev *idev, 3170 const struct in6_addr *addr, u32 flags) 3171 { 3172 struct ifa6_config cfg = { 3173 .pfx = addr, 3174 .plen = 64, 3175 .ifa_flags = flags | IFA_F_PERMANENT, 3176 .valid_lft = INFINITY_LIFE_TIME, 3177 .preferred_lft = INFINITY_LIFE_TIME, 3178 .scope = IFA_LINK 3179 }; 3180 struct inet6_ifaddr *ifp; 3181 3182 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3183 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad || 3184 idev->cnf.optimistic_dad) && 3185 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3186 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 3187 #endif 3188 3189 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3190 if (!IS_ERR(ifp)) { 3191 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev, 3192 0, 0, GFP_ATOMIC); 3193 addrconf_dad_start(ifp); 3194 in6_ifa_put(ifp); 3195 } 3196 } 3197 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3198 3199 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3200 { 3201 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3202 return true; 3203 3204 if (address.s6_addr32[2] == htonl(0x02005eff) && 3205 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3206 return true; 3207 3208 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3209 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3210 return true; 3211 3212 return false; 3213 } 3214 3215 static int ipv6_generate_stable_address(struct in6_addr *address, 3216 u8 dad_count, 3217 const struct inet6_dev *idev) 3218 { 3219 static DEFINE_SPINLOCK(lock); 3220 static __u32 digest[SHA1_DIGEST_WORDS]; 3221 static __u32 workspace[SHA1_WORKSPACE_WORDS]; 3222 3223 static union { 3224 char __data[SHA1_BLOCK_SIZE]; 3225 struct { 3226 struct in6_addr secret; 3227 __be32 prefix[2]; 3228 unsigned char hwaddr[MAX_ADDR_LEN]; 3229 u8 dad_count; 3230 } __packed; 3231 } data; 3232 3233 struct in6_addr secret; 3234 struct in6_addr temp; 3235 struct net *net = dev_net(idev->dev); 3236 3237 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3238 3239 if (idev->cnf.stable_secret.initialized) 3240 secret = idev->cnf.stable_secret.secret; 3241 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3242 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3243 else 3244 return -1; 3245 3246 retry: 3247 spin_lock_bh(&lock); 3248 3249 sha1_init(digest); 3250 memset(&data, 0, sizeof(data)); 3251 memset(workspace, 0, sizeof(workspace)); 3252 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3253 data.prefix[0] = address->s6_addr32[0]; 3254 data.prefix[1] = address->s6_addr32[1]; 3255 data.secret = secret; 3256 data.dad_count = dad_count; 3257 3258 sha1_transform(digest, data.__data, workspace); 3259 3260 temp = *address; 3261 temp.s6_addr32[2] = (__force __be32)digest[0]; 3262 temp.s6_addr32[3] = (__force __be32)digest[1]; 3263 3264 spin_unlock_bh(&lock); 3265 3266 if (ipv6_reserved_interfaceid(temp)) { 3267 dad_count++; 3268 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3269 return -1; 3270 goto retry; 3271 } 3272 3273 *address = temp; 3274 return 0; 3275 } 3276 3277 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3278 { 3279 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3280 3281 if (s->initialized) 3282 return; 3283 s = &idev->cnf.stable_secret; 3284 get_random_bytes(&s->secret, sizeof(s->secret)); 3285 s->initialized = true; 3286 } 3287 3288 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3289 { 3290 struct in6_addr addr; 3291 3292 /* no link local addresses on L3 master devices */ 3293 if (netif_is_l3_master(idev->dev)) 3294 return; 3295 3296 /* no link local addresses on devices flagged as slaves */ 3297 if (idev->dev->flags & IFF_SLAVE) 3298 return; 3299 3300 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3301 3302 switch (idev->cnf.addr_gen_mode) { 3303 case IN6_ADDR_GEN_MODE_RANDOM: 3304 ipv6_gen_mode_random_init(idev); 3305 fallthrough; 3306 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3307 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3308 addrconf_add_linklocal(idev, &addr, 3309 IFA_F_STABLE_PRIVACY); 3310 else if (prefix_route) 3311 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3312 0, 0, GFP_KERNEL); 3313 break; 3314 case IN6_ADDR_GEN_MODE_EUI64: 3315 /* addrconf_add_linklocal also adds a prefix_route and we 3316 * only need to care about prefix routes if ipv6_generate_eui64 3317 * couldn't generate one. 3318 */ 3319 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3320 addrconf_add_linklocal(idev, &addr, 0); 3321 else if (prefix_route) 3322 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3323 0, 0, GFP_KERNEL); 3324 break; 3325 case IN6_ADDR_GEN_MODE_NONE: 3326 default: 3327 /* will not add any link local address */ 3328 break; 3329 } 3330 } 3331 3332 static void addrconf_dev_config(struct net_device *dev) 3333 { 3334 struct inet6_dev *idev; 3335 3336 ASSERT_RTNL(); 3337 3338 if ((dev->type != ARPHRD_ETHER) && 3339 (dev->type != ARPHRD_FDDI) && 3340 (dev->type != ARPHRD_ARCNET) && 3341 (dev->type != ARPHRD_INFINIBAND) && 3342 (dev->type != ARPHRD_IEEE1394) && 3343 (dev->type != ARPHRD_TUNNEL6) && 3344 (dev->type != ARPHRD_6LOWPAN) && 3345 (dev->type != ARPHRD_IP6GRE) && 3346 (dev->type != ARPHRD_IPGRE) && 3347 (dev->type != ARPHRD_TUNNEL) && 3348 (dev->type != ARPHRD_NONE) && 3349 (dev->type != ARPHRD_RAWIP)) { 3350 /* Alas, we support only Ethernet autoconfiguration. */ 3351 idev = __in6_dev_get(dev); 3352 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP && 3353 dev->flags & IFF_MULTICAST) 3354 ipv6_mc_up(idev); 3355 return; 3356 } 3357 3358 idev = addrconf_add_dev(dev); 3359 if (IS_ERR(idev)) 3360 return; 3361 3362 /* this device type has no EUI support */ 3363 if (dev->type == ARPHRD_NONE && 3364 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3365 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3366 3367 addrconf_addr_gen(idev, false); 3368 } 3369 3370 #if IS_ENABLED(CONFIG_IPV6_SIT) 3371 static void addrconf_sit_config(struct net_device *dev) 3372 { 3373 struct inet6_dev *idev; 3374 3375 ASSERT_RTNL(); 3376 3377 /* 3378 * Configure the tunnel with one of our IPv4 3379 * addresses... we should configure all of 3380 * our v4 addrs in the tunnel 3381 */ 3382 3383 idev = ipv6_find_idev(dev); 3384 if (IS_ERR(idev)) { 3385 pr_debug("%s: add_dev failed\n", __func__); 3386 return; 3387 } 3388 3389 if (dev->priv_flags & IFF_ISATAP) { 3390 addrconf_addr_gen(idev, false); 3391 return; 3392 } 3393 3394 sit_add_v4_addrs(idev); 3395 3396 if (dev->flags&IFF_POINTOPOINT) 3397 addrconf_add_mroute(dev); 3398 } 3399 #endif 3400 3401 #if IS_ENABLED(CONFIG_NET_IPGRE) 3402 static void addrconf_gre_config(struct net_device *dev) 3403 { 3404 struct inet6_dev *idev; 3405 3406 ASSERT_RTNL(); 3407 3408 idev = ipv6_find_idev(dev); 3409 if (IS_ERR(idev)) { 3410 pr_debug("%s: add_dev failed\n", __func__); 3411 return; 3412 } 3413 3414 addrconf_addr_gen(idev, true); 3415 if (dev->flags & IFF_POINTOPOINT) 3416 addrconf_add_mroute(dev); 3417 } 3418 #endif 3419 3420 static int fixup_permanent_addr(struct net *net, 3421 struct inet6_dev *idev, 3422 struct inet6_ifaddr *ifp) 3423 { 3424 /* !fib6_node means the host route was removed from the 3425 * FIB, for example, if 'lo' device is taken down. In that 3426 * case regenerate the host route. 3427 */ 3428 if (!ifp->rt || !ifp->rt->fib6_node) { 3429 struct fib6_info *f6i, *prev; 3430 3431 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false, 3432 GFP_ATOMIC); 3433 if (IS_ERR(f6i)) 3434 return PTR_ERR(f6i); 3435 3436 /* ifp->rt can be accessed outside of rtnl */ 3437 spin_lock(&ifp->lock); 3438 prev = ifp->rt; 3439 ifp->rt = f6i; 3440 spin_unlock(&ifp->lock); 3441 3442 fib6_info_release(prev); 3443 } 3444 3445 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3446 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3447 ifp->rt_priority, idev->dev, 0, 0, 3448 GFP_ATOMIC); 3449 } 3450 3451 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3452 addrconf_dad_start(ifp); 3453 3454 return 0; 3455 } 3456 3457 static void addrconf_permanent_addr(struct net *net, struct net_device *dev) 3458 { 3459 struct inet6_ifaddr *ifp, *tmp; 3460 struct inet6_dev *idev; 3461 3462 idev = __in6_dev_get(dev); 3463 if (!idev) 3464 return; 3465 3466 write_lock_bh(&idev->lock); 3467 3468 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3469 if ((ifp->flags & IFA_F_PERMANENT) && 3470 fixup_permanent_addr(net, idev, ifp) < 0) { 3471 write_unlock_bh(&idev->lock); 3472 in6_ifa_hold(ifp); 3473 ipv6_del_addr(ifp); 3474 write_lock_bh(&idev->lock); 3475 3476 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3477 idev->dev->name, &ifp->addr); 3478 } 3479 } 3480 3481 write_unlock_bh(&idev->lock); 3482 } 3483 3484 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3485 void *ptr) 3486 { 3487 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3488 struct netdev_notifier_change_info *change_info; 3489 struct netdev_notifier_changeupper_info *info; 3490 struct inet6_dev *idev = __in6_dev_get(dev); 3491 struct net *net = dev_net(dev); 3492 int run_pending = 0; 3493 int err; 3494 3495 switch (event) { 3496 case NETDEV_REGISTER: 3497 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3498 idev = ipv6_add_dev(dev); 3499 if (IS_ERR(idev)) 3500 return notifier_from_errno(PTR_ERR(idev)); 3501 } 3502 break; 3503 3504 case NETDEV_CHANGEMTU: 3505 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3506 if (dev->mtu < IPV6_MIN_MTU) { 3507 addrconf_ifdown(dev, dev != net->loopback_dev); 3508 break; 3509 } 3510 3511 if (idev) { 3512 rt6_mtu_change(dev, dev->mtu); 3513 idev->cnf.mtu6 = dev->mtu; 3514 break; 3515 } 3516 3517 /* allocate new idev */ 3518 idev = ipv6_add_dev(dev); 3519 if (IS_ERR(idev)) 3520 break; 3521 3522 /* device is still not ready */ 3523 if (!(idev->if_flags & IF_READY)) 3524 break; 3525 3526 run_pending = 1; 3527 fallthrough; 3528 case NETDEV_UP: 3529 case NETDEV_CHANGE: 3530 if (dev->flags & IFF_SLAVE) 3531 break; 3532 3533 if (idev && idev->cnf.disable_ipv6) 3534 break; 3535 3536 if (event == NETDEV_UP) { 3537 /* restore routes for permanent addresses */ 3538 addrconf_permanent_addr(net, dev); 3539 3540 if (!addrconf_link_ready(dev)) { 3541 /* device is not ready yet. */ 3542 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3543 dev->name); 3544 break; 3545 } 3546 3547 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3548 idev = ipv6_add_dev(dev); 3549 3550 if (!IS_ERR_OR_NULL(idev)) { 3551 idev->if_flags |= IF_READY; 3552 run_pending = 1; 3553 } 3554 } else if (event == NETDEV_CHANGE) { 3555 if (!addrconf_link_ready(dev)) { 3556 /* device is still not ready. */ 3557 rt6_sync_down_dev(dev, event); 3558 break; 3559 } 3560 3561 if (!IS_ERR_OR_NULL(idev)) { 3562 if (idev->if_flags & IF_READY) { 3563 /* device is already configured - 3564 * but resend MLD reports, we might 3565 * have roamed and need to update 3566 * multicast snooping switches 3567 */ 3568 ipv6_mc_up(idev); 3569 change_info = ptr; 3570 if (change_info->flags_changed & IFF_NOARP) 3571 addrconf_dad_run(idev, true); 3572 rt6_sync_up(dev, RTNH_F_LINKDOWN); 3573 break; 3574 } 3575 idev->if_flags |= IF_READY; 3576 } 3577 3578 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3579 dev->name); 3580 3581 run_pending = 1; 3582 } 3583 3584 switch (dev->type) { 3585 #if IS_ENABLED(CONFIG_IPV6_SIT) 3586 case ARPHRD_SIT: 3587 addrconf_sit_config(dev); 3588 break; 3589 #endif 3590 #if IS_ENABLED(CONFIG_NET_IPGRE) 3591 case ARPHRD_IPGRE: 3592 addrconf_gre_config(dev); 3593 break; 3594 #endif 3595 case ARPHRD_LOOPBACK: 3596 init_loopback(dev); 3597 break; 3598 3599 default: 3600 addrconf_dev_config(dev); 3601 break; 3602 } 3603 3604 if (!IS_ERR_OR_NULL(idev)) { 3605 if (run_pending) 3606 addrconf_dad_run(idev, false); 3607 3608 /* Device has an address by now */ 3609 rt6_sync_up(dev, RTNH_F_DEAD); 3610 3611 /* 3612 * If the MTU changed during the interface down, 3613 * when the interface up, the changed MTU must be 3614 * reflected in the idev as well as routers. 3615 */ 3616 if (idev->cnf.mtu6 != dev->mtu && 3617 dev->mtu >= IPV6_MIN_MTU) { 3618 rt6_mtu_change(dev, dev->mtu); 3619 idev->cnf.mtu6 = dev->mtu; 3620 } 3621 idev->tstamp = jiffies; 3622 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3623 3624 /* 3625 * If the changed mtu during down is lower than 3626 * IPV6_MIN_MTU stop IPv6 on this interface. 3627 */ 3628 if (dev->mtu < IPV6_MIN_MTU) 3629 addrconf_ifdown(dev, dev != net->loopback_dev); 3630 } 3631 break; 3632 3633 case NETDEV_DOWN: 3634 case NETDEV_UNREGISTER: 3635 /* 3636 * Remove all addresses from this interface. 3637 */ 3638 addrconf_ifdown(dev, event != NETDEV_DOWN); 3639 break; 3640 3641 case NETDEV_CHANGENAME: 3642 if (idev) { 3643 snmp6_unregister_dev(idev); 3644 addrconf_sysctl_unregister(idev); 3645 err = addrconf_sysctl_register(idev); 3646 if (err) 3647 return notifier_from_errno(err); 3648 err = snmp6_register_dev(idev); 3649 if (err) { 3650 addrconf_sysctl_unregister(idev); 3651 return notifier_from_errno(err); 3652 } 3653 } 3654 break; 3655 3656 case NETDEV_PRE_TYPE_CHANGE: 3657 case NETDEV_POST_TYPE_CHANGE: 3658 if (idev) 3659 addrconf_type_change(dev, event); 3660 break; 3661 3662 case NETDEV_CHANGEUPPER: 3663 info = ptr; 3664 3665 /* flush all routes if dev is linked to or unlinked from 3666 * an L3 master device (e.g., VRF) 3667 */ 3668 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3669 addrconf_ifdown(dev, false); 3670 } 3671 3672 return NOTIFY_OK; 3673 } 3674 3675 /* 3676 * addrconf module should be notified of a device going up 3677 */ 3678 static struct notifier_block ipv6_dev_notf = { 3679 .notifier_call = addrconf_notify, 3680 .priority = ADDRCONF_NOTIFY_PRIORITY, 3681 }; 3682 3683 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3684 { 3685 struct inet6_dev *idev; 3686 ASSERT_RTNL(); 3687 3688 idev = __in6_dev_get(dev); 3689 3690 if (event == NETDEV_POST_TYPE_CHANGE) 3691 ipv6_mc_remap(idev); 3692 else if (event == NETDEV_PRE_TYPE_CHANGE) 3693 ipv6_mc_unmap(idev); 3694 } 3695 3696 static bool addr_is_local(const struct in6_addr *addr) 3697 { 3698 return ipv6_addr_type(addr) & 3699 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3700 } 3701 3702 static int addrconf_ifdown(struct net_device *dev, bool unregister) 3703 { 3704 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN; 3705 struct net *net = dev_net(dev); 3706 struct inet6_dev *idev; 3707 struct inet6_ifaddr *ifa, *tmp; 3708 bool keep_addr = false; 3709 int state, i; 3710 3711 ASSERT_RTNL(); 3712 3713 rt6_disable_ip(dev, event); 3714 3715 idev = __in6_dev_get(dev); 3716 if (!idev) 3717 return -ENODEV; 3718 3719 /* 3720 * Step 1: remove reference to ipv6 device from parent device. 3721 * Do not dev_put! 3722 */ 3723 if (unregister) { 3724 idev->dead = 1; 3725 3726 /* protected by rtnl_lock */ 3727 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3728 3729 /* Step 1.5: remove snmp6 entry */ 3730 snmp6_unregister_dev(idev); 3731 3732 } 3733 3734 /* combine the user config with event to determine if permanent 3735 * addresses are to be removed from address hash table 3736 */ 3737 if (!unregister && !idev->cnf.disable_ipv6) { 3738 /* aggregate the system setting and interface setting */ 3739 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3740 3741 if (!_keep_addr) 3742 _keep_addr = idev->cnf.keep_addr_on_down; 3743 3744 keep_addr = (_keep_addr > 0); 3745 } 3746 3747 /* Step 2: clear hash table */ 3748 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3749 struct hlist_head *h = &inet6_addr_lst[i]; 3750 3751 spin_lock_bh(&addrconf_hash_lock); 3752 restart: 3753 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3754 if (ifa->idev == idev) { 3755 addrconf_del_dad_work(ifa); 3756 /* combined flag + permanent flag decide if 3757 * address is retained on a down event 3758 */ 3759 if (!keep_addr || 3760 !(ifa->flags & IFA_F_PERMANENT) || 3761 addr_is_local(&ifa->addr)) { 3762 hlist_del_init_rcu(&ifa->addr_lst); 3763 goto restart; 3764 } 3765 } 3766 } 3767 spin_unlock_bh(&addrconf_hash_lock); 3768 } 3769 3770 write_lock_bh(&idev->lock); 3771 3772 addrconf_del_rs_timer(idev); 3773 3774 /* Step 2: clear flags for stateless addrconf */ 3775 if (!unregister) 3776 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3777 3778 /* Step 3: clear tempaddr list */ 3779 while (!list_empty(&idev->tempaddr_list)) { 3780 ifa = list_first_entry(&idev->tempaddr_list, 3781 struct inet6_ifaddr, tmp_list); 3782 list_del(&ifa->tmp_list); 3783 write_unlock_bh(&idev->lock); 3784 spin_lock_bh(&ifa->lock); 3785 3786 if (ifa->ifpub) { 3787 in6_ifa_put(ifa->ifpub); 3788 ifa->ifpub = NULL; 3789 } 3790 spin_unlock_bh(&ifa->lock); 3791 in6_ifa_put(ifa); 3792 write_lock_bh(&idev->lock); 3793 } 3794 3795 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3796 struct fib6_info *rt = NULL; 3797 bool keep; 3798 3799 addrconf_del_dad_work(ifa); 3800 3801 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3802 !addr_is_local(&ifa->addr); 3803 3804 write_unlock_bh(&idev->lock); 3805 spin_lock_bh(&ifa->lock); 3806 3807 if (keep) { 3808 /* set state to skip the notifier below */ 3809 state = INET6_IFADDR_STATE_DEAD; 3810 ifa->state = INET6_IFADDR_STATE_PREDAD; 3811 if (!(ifa->flags & IFA_F_NODAD)) 3812 ifa->flags |= IFA_F_TENTATIVE; 3813 3814 rt = ifa->rt; 3815 ifa->rt = NULL; 3816 } else { 3817 state = ifa->state; 3818 ifa->state = INET6_IFADDR_STATE_DEAD; 3819 } 3820 3821 spin_unlock_bh(&ifa->lock); 3822 3823 if (rt) 3824 ip6_del_rt(net, rt, false); 3825 3826 if (state != INET6_IFADDR_STATE_DEAD) { 3827 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3828 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3829 } else { 3830 if (idev->cnf.forwarding) 3831 addrconf_leave_anycast(ifa); 3832 addrconf_leave_solict(ifa->idev, &ifa->addr); 3833 } 3834 3835 write_lock_bh(&idev->lock); 3836 if (!keep) { 3837 list_del_rcu(&ifa->if_list); 3838 in6_ifa_put(ifa); 3839 } 3840 } 3841 3842 write_unlock_bh(&idev->lock); 3843 3844 /* Step 5: Discard anycast and multicast list */ 3845 if (unregister) { 3846 ipv6_ac_destroy_dev(idev); 3847 ipv6_mc_destroy_dev(idev); 3848 } else { 3849 ipv6_mc_down(idev); 3850 } 3851 3852 idev->tstamp = jiffies; 3853 3854 /* Last: Shot the device (if unregistered) */ 3855 if (unregister) { 3856 addrconf_sysctl_unregister(idev); 3857 neigh_parms_release(&nd_tbl, idev->nd_parms); 3858 neigh_ifdown(&nd_tbl, dev); 3859 in6_dev_put(idev); 3860 } 3861 return 0; 3862 } 3863 3864 static void addrconf_rs_timer(struct timer_list *t) 3865 { 3866 struct inet6_dev *idev = from_timer(idev, t, rs_timer); 3867 struct net_device *dev = idev->dev; 3868 struct in6_addr lladdr; 3869 3870 write_lock(&idev->lock); 3871 if (idev->dead || !(idev->if_flags & IF_READY)) 3872 goto out; 3873 3874 if (!ipv6_accept_ra(idev)) 3875 goto out; 3876 3877 /* Announcement received after solicitation was sent */ 3878 if (idev->if_flags & IF_RA_RCVD) 3879 goto out; 3880 3881 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3882 write_unlock(&idev->lock); 3883 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3884 ndisc_send_rs(dev, &lladdr, 3885 &in6addr_linklocal_allrouters); 3886 else 3887 goto put; 3888 3889 write_lock(&idev->lock); 3890 idev->rs_interval = rfc3315_s14_backoff_update( 3891 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3892 /* The wait after the last probe can be shorter */ 3893 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3894 idev->cnf.rtr_solicits) ? 3895 idev->cnf.rtr_solicit_delay : 3896 idev->rs_interval); 3897 } else { 3898 /* 3899 * Note: we do not support deprecated "all on-link" 3900 * assumption any longer. 3901 */ 3902 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3903 } 3904 3905 out: 3906 write_unlock(&idev->lock); 3907 put: 3908 in6_dev_put(idev); 3909 } 3910 3911 /* 3912 * Duplicate Address Detection 3913 */ 3914 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3915 { 3916 unsigned long rand_num; 3917 struct inet6_dev *idev = ifp->idev; 3918 u64 nonce; 3919 3920 if (ifp->flags & IFA_F_OPTIMISTIC) 3921 rand_num = 0; 3922 else 3923 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3924 3925 nonce = 0; 3926 if (idev->cnf.enhanced_dad || 3927 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 3928 do 3929 get_random_bytes(&nonce, 6); 3930 while (nonce == 0); 3931 } 3932 ifp->dad_nonce = nonce; 3933 ifp->dad_probes = idev->cnf.dad_transmits; 3934 addrconf_mod_dad_work(ifp, rand_num); 3935 } 3936 3937 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3938 { 3939 struct inet6_dev *idev = ifp->idev; 3940 struct net_device *dev = idev->dev; 3941 bool bump_id, notify = false; 3942 struct net *net; 3943 3944 addrconf_join_solict(dev, &ifp->addr); 3945 3946 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3947 3948 read_lock_bh(&idev->lock); 3949 spin_lock(&ifp->lock); 3950 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3951 goto out; 3952 3953 net = dev_net(dev); 3954 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3955 (net->ipv6.devconf_all->accept_dad < 1 && 3956 idev->cnf.accept_dad < 1) || 3957 !(ifp->flags&IFA_F_TENTATIVE) || 3958 ifp->flags & IFA_F_NODAD) { 3959 bool send_na = false; 3960 3961 if (ifp->flags & IFA_F_TENTATIVE && 3962 !(ifp->flags & IFA_F_OPTIMISTIC)) 3963 send_na = true; 3964 bump_id = ifp->flags & IFA_F_TENTATIVE; 3965 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3966 spin_unlock(&ifp->lock); 3967 read_unlock_bh(&idev->lock); 3968 3969 addrconf_dad_completed(ifp, bump_id, send_na); 3970 return; 3971 } 3972 3973 if (!(idev->if_flags & IF_READY)) { 3974 spin_unlock(&ifp->lock); 3975 read_unlock_bh(&idev->lock); 3976 /* 3977 * If the device is not ready: 3978 * - keep it tentative if it is a permanent address. 3979 * - otherwise, kill it. 3980 */ 3981 in6_ifa_hold(ifp); 3982 addrconf_dad_stop(ifp, 0); 3983 return; 3984 } 3985 3986 /* 3987 * Optimistic nodes can start receiving 3988 * Frames right away 3989 */ 3990 if (ifp->flags & IFA_F_OPTIMISTIC) { 3991 ip6_ins_rt(net, ifp->rt); 3992 if (ipv6_use_optimistic_addr(net, idev)) { 3993 /* Because optimistic nodes can use this address, 3994 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3995 */ 3996 notify = true; 3997 } 3998 } 3999 4000 addrconf_dad_kick(ifp); 4001 out: 4002 spin_unlock(&ifp->lock); 4003 read_unlock_bh(&idev->lock); 4004 if (notify) 4005 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4006 } 4007 4008 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 4009 { 4010 bool begin_dad = false; 4011 4012 spin_lock_bh(&ifp->lock); 4013 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 4014 ifp->state = INET6_IFADDR_STATE_PREDAD; 4015 begin_dad = true; 4016 } 4017 spin_unlock_bh(&ifp->lock); 4018 4019 if (begin_dad) 4020 addrconf_mod_dad_work(ifp, 0); 4021 } 4022 4023 static void addrconf_dad_work(struct work_struct *w) 4024 { 4025 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 4026 struct inet6_ifaddr, 4027 dad_work); 4028 struct inet6_dev *idev = ifp->idev; 4029 bool bump_id, disable_ipv6 = false; 4030 struct in6_addr mcaddr; 4031 4032 enum { 4033 DAD_PROCESS, 4034 DAD_BEGIN, 4035 DAD_ABORT, 4036 } action = DAD_PROCESS; 4037 4038 rtnl_lock(); 4039 4040 spin_lock_bh(&ifp->lock); 4041 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 4042 action = DAD_BEGIN; 4043 ifp->state = INET6_IFADDR_STATE_DAD; 4044 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 4045 action = DAD_ABORT; 4046 ifp->state = INET6_IFADDR_STATE_POSTDAD; 4047 4048 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 || 4049 idev->cnf.accept_dad > 1) && 4050 !idev->cnf.disable_ipv6 && 4051 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 4052 struct in6_addr addr; 4053 4054 addr.s6_addr32[0] = htonl(0xfe800000); 4055 addr.s6_addr32[1] = 0; 4056 4057 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 4058 ipv6_addr_equal(&ifp->addr, &addr)) { 4059 /* DAD failed for link-local based on MAC */ 4060 idev->cnf.disable_ipv6 = 1; 4061 4062 pr_info("%s: IPv6 being disabled!\n", 4063 ifp->idev->dev->name); 4064 disable_ipv6 = true; 4065 } 4066 } 4067 } 4068 spin_unlock_bh(&ifp->lock); 4069 4070 if (action == DAD_BEGIN) { 4071 addrconf_dad_begin(ifp); 4072 goto out; 4073 } else if (action == DAD_ABORT) { 4074 in6_ifa_hold(ifp); 4075 addrconf_dad_stop(ifp, 1); 4076 if (disable_ipv6) 4077 addrconf_ifdown(idev->dev, false); 4078 goto out; 4079 } 4080 4081 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 4082 goto out; 4083 4084 write_lock_bh(&idev->lock); 4085 if (idev->dead || !(idev->if_flags & IF_READY)) { 4086 write_unlock_bh(&idev->lock); 4087 goto out; 4088 } 4089 4090 spin_lock(&ifp->lock); 4091 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 4092 spin_unlock(&ifp->lock); 4093 write_unlock_bh(&idev->lock); 4094 goto out; 4095 } 4096 4097 if (ifp->dad_probes == 0) { 4098 bool send_na = false; 4099 4100 /* 4101 * DAD was successful 4102 */ 4103 4104 if (ifp->flags & IFA_F_TENTATIVE && 4105 !(ifp->flags & IFA_F_OPTIMISTIC)) 4106 send_na = true; 4107 bump_id = ifp->flags & IFA_F_TENTATIVE; 4108 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4109 spin_unlock(&ifp->lock); 4110 write_unlock_bh(&idev->lock); 4111 4112 addrconf_dad_completed(ifp, bump_id, send_na); 4113 4114 goto out; 4115 } 4116 4117 ifp->dad_probes--; 4118 addrconf_mod_dad_work(ifp, 4119 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), 4120 HZ/100)); 4121 spin_unlock(&ifp->lock); 4122 write_unlock_bh(&idev->lock); 4123 4124 /* send a neighbour solicitation for our addr */ 4125 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 4126 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 4127 ifp->dad_nonce); 4128 out: 4129 in6_ifa_put(ifp); 4130 rtnl_unlock(); 4131 } 4132 4133 /* ifp->idev must be at least read locked */ 4134 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4135 { 4136 struct inet6_ifaddr *ifpiter; 4137 struct inet6_dev *idev = ifp->idev; 4138 4139 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4140 if (ifpiter->scope > IFA_LINK) 4141 break; 4142 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4143 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4144 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4145 IFA_F_PERMANENT) 4146 return false; 4147 } 4148 return true; 4149 } 4150 4151 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 4152 bool send_na) 4153 { 4154 struct net_device *dev = ifp->idev->dev; 4155 struct in6_addr lladdr; 4156 bool send_rs, send_mld; 4157 4158 addrconf_del_dad_work(ifp); 4159 4160 /* 4161 * Configure the address for reception. Now it is valid. 4162 */ 4163 4164 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4165 4166 /* If added prefix is link local and we are prepared to process 4167 router advertisements, start sending router solicitations. 4168 */ 4169 4170 read_lock_bh(&ifp->idev->lock); 4171 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4172 send_rs = send_mld && 4173 ipv6_accept_ra(ifp->idev) && 4174 ifp->idev->cnf.rtr_solicits != 0 && 4175 (dev->flags&IFF_LOOPBACK) == 0; 4176 read_unlock_bh(&ifp->idev->lock); 4177 4178 /* While dad is in progress mld report's source address is in6_addrany. 4179 * Resend with proper ll now. 4180 */ 4181 if (send_mld) 4182 ipv6_mc_dad_complete(ifp->idev); 4183 4184 /* send unsolicited NA if enabled */ 4185 if (send_na && 4186 (ifp->idev->cnf.ndisc_notify || 4187 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) { 4188 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr, 4189 /*router=*/ !!ifp->idev->cnf.forwarding, 4190 /*solicited=*/ false, /*override=*/ true, 4191 /*inc_opt=*/ true); 4192 } 4193 4194 if (send_rs) { 4195 /* 4196 * If a host as already performed a random delay 4197 * [...] as part of DAD [...] there is no need 4198 * to delay again before sending the first RS 4199 */ 4200 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4201 return; 4202 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4203 4204 write_lock_bh(&ifp->idev->lock); 4205 spin_lock(&ifp->lock); 4206 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4207 ifp->idev->cnf.rtr_solicit_interval); 4208 ifp->idev->rs_probes = 1; 4209 ifp->idev->if_flags |= IF_RS_SENT; 4210 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4211 spin_unlock(&ifp->lock); 4212 write_unlock_bh(&ifp->idev->lock); 4213 } 4214 4215 if (bump_id) 4216 rt_genid_bump_ipv6(dev_net(dev)); 4217 4218 /* Make sure that a new temporary address will be created 4219 * before this temporary address becomes deprecated. 4220 */ 4221 if (ifp->flags & IFA_F_TEMPORARY) 4222 addrconf_verify_rtnl(); 4223 } 4224 4225 static void addrconf_dad_run(struct inet6_dev *idev, bool restart) 4226 { 4227 struct inet6_ifaddr *ifp; 4228 4229 read_lock_bh(&idev->lock); 4230 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4231 spin_lock(&ifp->lock); 4232 if ((ifp->flags & IFA_F_TENTATIVE && 4233 ifp->state == INET6_IFADDR_STATE_DAD) || restart) { 4234 if (restart) 4235 ifp->state = INET6_IFADDR_STATE_PREDAD; 4236 addrconf_dad_kick(ifp); 4237 } 4238 spin_unlock(&ifp->lock); 4239 } 4240 read_unlock_bh(&idev->lock); 4241 } 4242 4243 #ifdef CONFIG_PROC_FS 4244 struct if6_iter_state { 4245 struct seq_net_private p; 4246 int bucket; 4247 int offset; 4248 }; 4249 4250 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4251 { 4252 struct if6_iter_state *state = seq->private; 4253 struct net *net = seq_file_net(seq); 4254 struct inet6_ifaddr *ifa = NULL; 4255 int p = 0; 4256 4257 /* initial bucket if pos is 0 */ 4258 if (pos == 0) { 4259 state->bucket = 0; 4260 state->offset = 0; 4261 } 4262 4263 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4264 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket], 4265 addr_lst) { 4266 if (!net_eq(dev_net(ifa->idev->dev), net)) 4267 continue; 4268 /* sync with offset */ 4269 if (p < state->offset) { 4270 p++; 4271 continue; 4272 } 4273 return ifa; 4274 } 4275 4276 /* prepare for next bucket */ 4277 state->offset = 0; 4278 p = 0; 4279 } 4280 return NULL; 4281 } 4282 4283 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4284 struct inet6_ifaddr *ifa) 4285 { 4286 struct if6_iter_state *state = seq->private; 4287 struct net *net = seq_file_net(seq); 4288 4289 hlist_for_each_entry_continue_rcu(ifa, addr_lst) { 4290 if (!net_eq(dev_net(ifa->idev->dev), net)) 4291 continue; 4292 state->offset++; 4293 return ifa; 4294 } 4295 4296 state->offset = 0; 4297 while (++state->bucket < IN6_ADDR_HSIZE) { 4298 hlist_for_each_entry_rcu(ifa, 4299 &inet6_addr_lst[state->bucket], addr_lst) { 4300 if (!net_eq(dev_net(ifa->idev->dev), net)) 4301 continue; 4302 return ifa; 4303 } 4304 } 4305 4306 return NULL; 4307 } 4308 4309 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4310 __acquires(rcu) 4311 { 4312 rcu_read_lock(); 4313 return if6_get_first(seq, *pos); 4314 } 4315 4316 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4317 { 4318 struct inet6_ifaddr *ifa; 4319 4320 ifa = if6_get_next(seq, v); 4321 ++*pos; 4322 return ifa; 4323 } 4324 4325 static void if6_seq_stop(struct seq_file *seq, void *v) 4326 __releases(rcu) 4327 { 4328 rcu_read_unlock(); 4329 } 4330 4331 static int if6_seq_show(struct seq_file *seq, void *v) 4332 { 4333 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4334 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4335 &ifp->addr, 4336 ifp->idev->dev->ifindex, 4337 ifp->prefix_len, 4338 ifp->scope, 4339 (u8) ifp->flags, 4340 ifp->idev->dev->name); 4341 return 0; 4342 } 4343 4344 static const struct seq_operations if6_seq_ops = { 4345 .start = if6_seq_start, 4346 .next = if6_seq_next, 4347 .show = if6_seq_show, 4348 .stop = if6_seq_stop, 4349 }; 4350 4351 static int __net_init if6_proc_net_init(struct net *net) 4352 { 4353 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops, 4354 sizeof(struct if6_iter_state))) 4355 return -ENOMEM; 4356 return 0; 4357 } 4358 4359 static void __net_exit if6_proc_net_exit(struct net *net) 4360 { 4361 remove_proc_entry("if_inet6", net->proc_net); 4362 } 4363 4364 static struct pernet_operations if6_proc_net_ops = { 4365 .init = if6_proc_net_init, 4366 .exit = if6_proc_net_exit, 4367 }; 4368 4369 int __init if6_proc_init(void) 4370 { 4371 return register_pernet_subsys(&if6_proc_net_ops); 4372 } 4373 4374 void if6_proc_exit(void) 4375 { 4376 unregister_pernet_subsys(&if6_proc_net_ops); 4377 } 4378 #endif /* CONFIG_PROC_FS */ 4379 4380 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4381 /* Check if address is a home address configured on any interface. */ 4382 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4383 { 4384 unsigned int hash = inet6_addr_hash(net, addr); 4385 struct inet6_ifaddr *ifp = NULL; 4386 int ret = 0; 4387 4388 rcu_read_lock(); 4389 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 4390 if (!net_eq(dev_net(ifp->idev->dev), net)) 4391 continue; 4392 if (ipv6_addr_equal(&ifp->addr, addr) && 4393 (ifp->flags & IFA_F_HOMEADDRESS)) { 4394 ret = 1; 4395 break; 4396 } 4397 } 4398 rcu_read_unlock(); 4399 return ret; 4400 } 4401 #endif 4402 4403 /* RFC6554 has some algorithm to avoid loops in segment routing by 4404 * checking if the segments contains any of a local interface address. 4405 * 4406 * Quote: 4407 * 4408 * To detect loops in the SRH, a router MUST determine if the SRH 4409 * includes multiple addresses assigned to any interface on that router. 4410 * If such addresses appear more than once and are separated by at least 4411 * one address not assigned to that router. 4412 */ 4413 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs, 4414 unsigned char nsegs) 4415 { 4416 const struct in6_addr *addr; 4417 int i, ret = 0, found = 0; 4418 struct inet6_ifaddr *ifp; 4419 bool separated = false; 4420 unsigned int hash; 4421 bool hash_found; 4422 4423 rcu_read_lock(); 4424 for (i = 0; i < nsegs; i++) { 4425 addr = &segs[i]; 4426 hash = inet6_addr_hash(net, addr); 4427 4428 hash_found = false; 4429 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 4430 if (!net_eq(dev_net(ifp->idev->dev), net)) 4431 continue; 4432 4433 if (ipv6_addr_equal(&ifp->addr, addr)) { 4434 hash_found = true; 4435 break; 4436 } 4437 } 4438 4439 if (hash_found) { 4440 if (found > 1 && separated) { 4441 ret = 1; 4442 break; 4443 } 4444 4445 separated = false; 4446 found++; 4447 } else { 4448 separated = true; 4449 } 4450 } 4451 rcu_read_unlock(); 4452 4453 return ret; 4454 } 4455 4456 /* 4457 * Periodic address status verification 4458 */ 4459 4460 static void addrconf_verify_rtnl(void) 4461 { 4462 unsigned long now, next, next_sec, next_sched; 4463 struct inet6_ifaddr *ifp; 4464 int i; 4465 4466 ASSERT_RTNL(); 4467 4468 rcu_read_lock_bh(); 4469 now = jiffies; 4470 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4471 4472 cancel_delayed_work(&addr_chk_work); 4473 4474 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4475 restart: 4476 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4477 unsigned long age; 4478 4479 /* When setting preferred_lft to a value not zero or 4480 * infinity, while valid_lft is infinity 4481 * IFA_F_PERMANENT has a non-infinity life time. 4482 */ 4483 if ((ifp->flags & IFA_F_PERMANENT) && 4484 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4485 continue; 4486 4487 spin_lock(&ifp->lock); 4488 /* We try to batch several events at once. */ 4489 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4490 4491 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4492 age >= ifp->valid_lft) { 4493 spin_unlock(&ifp->lock); 4494 in6_ifa_hold(ifp); 4495 rcu_read_unlock_bh(); 4496 ipv6_del_addr(ifp); 4497 rcu_read_lock_bh(); 4498 goto restart; 4499 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4500 spin_unlock(&ifp->lock); 4501 continue; 4502 } else if (age >= ifp->prefered_lft) { 4503 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4504 int deprecate = 0; 4505 4506 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4507 deprecate = 1; 4508 ifp->flags |= IFA_F_DEPRECATED; 4509 } 4510 4511 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4512 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4513 next = ifp->tstamp + ifp->valid_lft * HZ; 4514 4515 spin_unlock(&ifp->lock); 4516 4517 if (deprecate) { 4518 in6_ifa_hold(ifp); 4519 4520 ipv6_ifa_notify(0, ifp); 4521 in6_ifa_put(ifp); 4522 goto restart; 4523 } 4524 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4525 !(ifp->flags&IFA_F_TENTATIVE)) { 4526 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4527 ifp->idev->cnf.dad_transmits * 4528 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 4529 4530 if (age >= ifp->prefered_lft - regen_advance) { 4531 struct inet6_ifaddr *ifpub = ifp->ifpub; 4532 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4533 next = ifp->tstamp + ifp->prefered_lft * HZ; 4534 if (!ifp->regen_count && ifpub) { 4535 ifp->regen_count++; 4536 in6_ifa_hold(ifp); 4537 in6_ifa_hold(ifpub); 4538 spin_unlock(&ifp->lock); 4539 4540 spin_lock(&ifpub->lock); 4541 ifpub->regen_count = 0; 4542 spin_unlock(&ifpub->lock); 4543 rcu_read_unlock_bh(); 4544 ipv6_create_tempaddr(ifpub, true); 4545 in6_ifa_put(ifpub); 4546 in6_ifa_put(ifp); 4547 rcu_read_lock_bh(); 4548 goto restart; 4549 } 4550 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4551 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4552 spin_unlock(&ifp->lock); 4553 } else { 4554 /* ifp->prefered_lft <= ifp->valid_lft */ 4555 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4556 next = ifp->tstamp + ifp->prefered_lft * HZ; 4557 spin_unlock(&ifp->lock); 4558 } 4559 } 4560 } 4561 4562 next_sec = round_jiffies_up(next); 4563 next_sched = next; 4564 4565 /* If rounded timeout is accurate enough, accept it. */ 4566 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4567 next_sched = next_sec; 4568 4569 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4570 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4571 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4572 4573 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4574 now, next, next_sec, next_sched); 4575 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4576 rcu_read_unlock_bh(); 4577 } 4578 4579 static void addrconf_verify_work(struct work_struct *w) 4580 { 4581 rtnl_lock(); 4582 addrconf_verify_rtnl(); 4583 rtnl_unlock(); 4584 } 4585 4586 static void addrconf_verify(void) 4587 { 4588 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4589 } 4590 4591 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4592 struct in6_addr **peer_pfx) 4593 { 4594 struct in6_addr *pfx = NULL; 4595 4596 *peer_pfx = NULL; 4597 4598 if (addr) 4599 pfx = nla_data(addr); 4600 4601 if (local) { 4602 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4603 *peer_pfx = pfx; 4604 pfx = nla_data(local); 4605 } 4606 4607 return pfx; 4608 } 4609 4610 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4611 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4612 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4613 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4614 [IFA_FLAGS] = { .len = sizeof(u32) }, 4615 [IFA_RT_PRIORITY] = { .len = sizeof(u32) }, 4616 [IFA_TARGET_NETNSID] = { .type = NLA_S32 }, 4617 }; 4618 4619 static int 4620 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4621 struct netlink_ext_ack *extack) 4622 { 4623 struct net *net = sock_net(skb->sk); 4624 struct ifaddrmsg *ifm; 4625 struct nlattr *tb[IFA_MAX+1]; 4626 struct in6_addr *pfx, *peer_pfx; 4627 u32 ifa_flags; 4628 int err; 4629 4630 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4631 ifa_ipv6_policy, extack); 4632 if (err < 0) 4633 return err; 4634 4635 ifm = nlmsg_data(nlh); 4636 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4637 if (!pfx) 4638 return -EINVAL; 4639 4640 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4641 4642 /* We ignore other flags so far. */ 4643 ifa_flags &= IFA_F_MANAGETEMPADDR; 4644 4645 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4646 ifm->ifa_prefixlen); 4647 } 4648 4649 static int modify_prefix_route(struct inet6_ifaddr *ifp, 4650 unsigned long expires, u32 flags, 4651 bool modify_peer) 4652 { 4653 struct fib6_info *f6i; 4654 u32 prio; 4655 4656 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4657 ifp->prefix_len, 4658 ifp->idev->dev, 0, RTF_DEFAULT, true); 4659 if (!f6i) 4660 return -ENOENT; 4661 4662 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF; 4663 if (f6i->fib6_metric != prio) { 4664 /* delete old one */ 4665 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 4666 4667 /* add new one */ 4668 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4669 ifp->prefix_len, 4670 ifp->rt_priority, ifp->idev->dev, 4671 expires, flags, GFP_KERNEL); 4672 } else { 4673 if (!expires) 4674 fib6_clean_expires(f6i); 4675 else 4676 fib6_set_expires(f6i, expires); 4677 4678 fib6_info_release(f6i); 4679 } 4680 4681 return 0; 4682 } 4683 4684 static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg) 4685 { 4686 u32 flags; 4687 clock_t expires; 4688 unsigned long timeout; 4689 bool was_managetempaddr; 4690 bool had_prefixroute; 4691 bool new_peer = false; 4692 4693 ASSERT_RTNL(); 4694 4695 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 4696 return -EINVAL; 4697 4698 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && 4699 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4700 return -EINVAL; 4701 4702 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED) 4703 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC; 4704 4705 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 4706 if (addrconf_finite_timeout(timeout)) { 4707 expires = jiffies_to_clock_t(timeout * HZ); 4708 cfg->valid_lft = timeout; 4709 flags = RTF_EXPIRES; 4710 } else { 4711 expires = 0; 4712 flags = 0; 4713 cfg->ifa_flags |= IFA_F_PERMANENT; 4714 } 4715 4716 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 4717 if (addrconf_finite_timeout(timeout)) { 4718 if (timeout == 0) 4719 cfg->ifa_flags |= IFA_F_DEPRECATED; 4720 cfg->preferred_lft = timeout; 4721 } 4722 4723 if (cfg->peer_pfx && 4724 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) { 4725 if (!ipv6_addr_any(&ifp->peer_addr)) 4726 cleanup_prefix_route(ifp, expires, true, true); 4727 new_peer = true; 4728 } 4729 4730 spin_lock_bh(&ifp->lock); 4731 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4732 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4733 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4734 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4735 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4736 IFA_F_NOPREFIXROUTE); 4737 ifp->flags |= cfg->ifa_flags; 4738 ifp->tstamp = jiffies; 4739 ifp->valid_lft = cfg->valid_lft; 4740 ifp->prefered_lft = cfg->preferred_lft; 4741 4742 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority) 4743 ifp->rt_priority = cfg->rt_priority; 4744 4745 if (new_peer) 4746 ifp->peer_addr = *cfg->peer_pfx; 4747 4748 spin_unlock_bh(&ifp->lock); 4749 if (!(ifp->flags&IFA_F_TENTATIVE)) 4750 ipv6_ifa_notify(0, ifp); 4751 4752 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 4753 int rc = -ENOENT; 4754 4755 if (had_prefixroute) 4756 rc = modify_prefix_route(ifp, expires, flags, false); 4757 4758 /* prefix route could have been deleted; if so restore it */ 4759 if (rc == -ENOENT) { 4760 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4761 ifp->rt_priority, ifp->idev->dev, 4762 expires, flags, GFP_KERNEL); 4763 } 4764 4765 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr)) 4766 rc = modify_prefix_route(ifp, expires, flags, true); 4767 4768 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) { 4769 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len, 4770 ifp->rt_priority, ifp->idev->dev, 4771 expires, flags, GFP_KERNEL); 4772 } 4773 } else if (had_prefixroute) { 4774 enum cleanup_prefix_rt_t action; 4775 unsigned long rt_expires; 4776 4777 write_lock_bh(&ifp->idev->lock); 4778 action = check_cleanup_prefix_route(ifp, &rt_expires); 4779 write_unlock_bh(&ifp->idev->lock); 4780 4781 if (action != CLEANUP_PREFIX_RT_NOP) { 4782 cleanup_prefix_route(ifp, rt_expires, 4783 action == CLEANUP_PREFIX_RT_DEL, false); 4784 } 4785 } 4786 4787 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4788 if (was_managetempaddr && 4789 !(ifp->flags & IFA_F_MANAGETEMPADDR)) { 4790 cfg->valid_lft = 0; 4791 cfg->preferred_lft = 0; 4792 } 4793 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft, 4794 cfg->preferred_lft, !was_managetempaddr, 4795 jiffies); 4796 } 4797 4798 addrconf_verify_rtnl(); 4799 4800 return 0; 4801 } 4802 4803 static int 4804 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4805 struct netlink_ext_ack *extack) 4806 { 4807 struct net *net = sock_net(skb->sk); 4808 struct ifaddrmsg *ifm; 4809 struct nlattr *tb[IFA_MAX+1]; 4810 struct in6_addr *peer_pfx; 4811 struct inet6_ifaddr *ifa; 4812 struct net_device *dev; 4813 struct inet6_dev *idev; 4814 struct ifa6_config cfg; 4815 int err; 4816 4817 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4818 ifa_ipv6_policy, extack); 4819 if (err < 0) 4820 return err; 4821 4822 memset(&cfg, 0, sizeof(cfg)); 4823 4824 ifm = nlmsg_data(nlh); 4825 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4826 if (!cfg.pfx) 4827 return -EINVAL; 4828 4829 cfg.peer_pfx = peer_pfx; 4830 cfg.plen = ifm->ifa_prefixlen; 4831 if (tb[IFA_RT_PRIORITY]) 4832 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]); 4833 4834 cfg.valid_lft = INFINITY_LIFE_TIME; 4835 cfg.preferred_lft = INFINITY_LIFE_TIME; 4836 4837 if (tb[IFA_CACHEINFO]) { 4838 struct ifa_cacheinfo *ci; 4839 4840 ci = nla_data(tb[IFA_CACHEINFO]); 4841 cfg.valid_lft = ci->ifa_valid; 4842 cfg.preferred_lft = ci->ifa_prefered; 4843 } 4844 4845 dev = __dev_get_by_index(net, ifm->ifa_index); 4846 if (!dev) 4847 return -ENODEV; 4848 4849 if (tb[IFA_FLAGS]) 4850 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]); 4851 else 4852 cfg.ifa_flags = ifm->ifa_flags; 4853 4854 /* We ignore other flags so far. */ 4855 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | 4856 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE | 4857 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC; 4858 4859 idev = ipv6_find_idev(dev); 4860 if (IS_ERR(idev)) 4861 return PTR_ERR(idev); 4862 4863 if (!ipv6_allow_optimistic_dad(net, idev)) 4864 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC; 4865 4866 if (cfg.ifa_flags & IFA_F_NODAD && 4867 cfg.ifa_flags & IFA_F_OPTIMISTIC) { 4868 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive"); 4869 return -EINVAL; 4870 } 4871 4872 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1); 4873 if (!ifa) { 4874 /* 4875 * It would be best to check for !NLM_F_CREATE here but 4876 * userspace already relies on not having to provide this. 4877 */ 4878 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack); 4879 } 4880 4881 if (nlh->nlmsg_flags & NLM_F_EXCL || 4882 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4883 err = -EEXIST; 4884 else 4885 err = inet6_addr_modify(ifa, &cfg); 4886 4887 in6_ifa_put(ifa); 4888 4889 return err; 4890 } 4891 4892 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4893 u8 scope, int ifindex) 4894 { 4895 struct ifaddrmsg *ifm; 4896 4897 ifm = nlmsg_data(nlh); 4898 ifm->ifa_family = AF_INET6; 4899 ifm->ifa_prefixlen = prefixlen; 4900 ifm->ifa_flags = flags; 4901 ifm->ifa_scope = scope; 4902 ifm->ifa_index = ifindex; 4903 } 4904 4905 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4906 unsigned long tstamp, u32 preferred, u32 valid) 4907 { 4908 struct ifa_cacheinfo ci; 4909 4910 ci.cstamp = cstamp_delta(cstamp); 4911 ci.tstamp = cstamp_delta(tstamp); 4912 ci.ifa_prefered = preferred; 4913 ci.ifa_valid = valid; 4914 4915 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4916 } 4917 4918 static inline int rt_scope(int ifa_scope) 4919 { 4920 if (ifa_scope & IFA_HOST) 4921 return RT_SCOPE_HOST; 4922 else if (ifa_scope & IFA_LINK) 4923 return RT_SCOPE_LINK; 4924 else if (ifa_scope & IFA_SITE) 4925 return RT_SCOPE_SITE; 4926 else 4927 return RT_SCOPE_UNIVERSE; 4928 } 4929 4930 static inline int inet6_ifaddr_msgsize(void) 4931 { 4932 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4933 + nla_total_size(16) /* IFA_LOCAL */ 4934 + nla_total_size(16) /* IFA_ADDRESS */ 4935 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4936 + nla_total_size(4) /* IFA_FLAGS */ 4937 + nla_total_size(4) /* IFA_RT_PRIORITY */; 4938 } 4939 4940 enum addr_type_t { 4941 UNICAST_ADDR, 4942 MULTICAST_ADDR, 4943 ANYCAST_ADDR, 4944 }; 4945 4946 struct inet6_fill_args { 4947 u32 portid; 4948 u32 seq; 4949 int event; 4950 unsigned int flags; 4951 int netnsid; 4952 int ifindex; 4953 enum addr_type_t type; 4954 }; 4955 4956 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4957 struct inet6_fill_args *args) 4958 { 4959 struct nlmsghdr *nlh; 4960 u32 preferred, valid; 4961 4962 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 4963 sizeof(struct ifaddrmsg), args->flags); 4964 if (!nlh) 4965 return -EMSGSIZE; 4966 4967 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4968 ifa->idev->dev->ifindex); 4969 4970 if (args->netnsid >= 0 && 4971 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 4972 goto error; 4973 4974 if (!((ifa->flags&IFA_F_PERMANENT) && 4975 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4976 preferred = ifa->prefered_lft; 4977 valid = ifa->valid_lft; 4978 if (preferred != INFINITY_LIFE_TIME) { 4979 long tval = (jiffies - ifa->tstamp)/HZ; 4980 if (preferred > tval) 4981 preferred -= tval; 4982 else 4983 preferred = 0; 4984 if (valid != INFINITY_LIFE_TIME) { 4985 if (valid > tval) 4986 valid -= tval; 4987 else 4988 valid = 0; 4989 } 4990 } 4991 } else { 4992 preferred = INFINITY_LIFE_TIME; 4993 valid = INFINITY_LIFE_TIME; 4994 } 4995 4996 if (!ipv6_addr_any(&ifa->peer_addr)) { 4997 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4998 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4999 goto error; 5000 } else 5001 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 5002 goto error; 5003 5004 if (ifa->rt_priority && 5005 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority)) 5006 goto error; 5007 5008 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 5009 goto error; 5010 5011 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 5012 goto error; 5013 5014 nlmsg_end(skb, nlh); 5015 return 0; 5016 5017 error: 5018 nlmsg_cancel(skb, nlh); 5019 return -EMSGSIZE; 5020 } 5021 5022 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 5023 struct inet6_fill_args *args) 5024 { 5025 struct nlmsghdr *nlh; 5026 u8 scope = RT_SCOPE_UNIVERSE; 5027 int ifindex = ifmca->idev->dev->ifindex; 5028 5029 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 5030 scope = RT_SCOPE_SITE; 5031 5032 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5033 sizeof(struct ifaddrmsg), args->flags); 5034 if (!nlh) 5035 return -EMSGSIZE; 5036 5037 if (args->netnsid >= 0 && 5038 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5039 nlmsg_cancel(skb, nlh); 5040 return -EMSGSIZE; 5041 } 5042 5043 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5044 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 5045 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 5046 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5047 nlmsg_cancel(skb, nlh); 5048 return -EMSGSIZE; 5049 } 5050 5051 nlmsg_end(skb, nlh); 5052 return 0; 5053 } 5054 5055 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 5056 struct inet6_fill_args *args) 5057 { 5058 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt); 5059 int ifindex = dev ? dev->ifindex : 1; 5060 struct nlmsghdr *nlh; 5061 u8 scope = RT_SCOPE_UNIVERSE; 5062 5063 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 5064 scope = RT_SCOPE_SITE; 5065 5066 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5067 sizeof(struct ifaddrmsg), args->flags); 5068 if (!nlh) 5069 return -EMSGSIZE; 5070 5071 if (args->netnsid >= 0 && 5072 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5073 nlmsg_cancel(skb, nlh); 5074 return -EMSGSIZE; 5075 } 5076 5077 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5078 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 5079 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 5080 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5081 nlmsg_cancel(skb, nlh); 5082 return -EMSGSIZE; 5083 } 5084 5085 nlmsg_end(skb, nlh); 5086 return 0; 5087 } 5088 5089 /* called with rcu_read_lock() */ 5090 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 5091 struct netlink_callback *cb, int s_ip_idx, 5092 struct inet6_fill_args *fillargs) 5093 { 5094 struct ifmcaddr6 *ifmca; 5095 struct ifacaddr6 *ifaca; 5096 int ip_idx = 0; 5097 int err = 1; 5098 5099 read_lock_bh(&idev->lock); 5100 switch (fillargs->type) { 5101 case UNICAST_ADDR: { 5102 struct inet6_ifaddr *ifa; 5103 fillargs->event = RTM_NEWADDR; 5104 5105 /* unicast address incl. temp addr */ 5106 list_for_each_entry(ifa, &idev->addr_list, if_list) { 5107 if (ip_idx < s_ip_idx) 5108 goto next; 5109 err = inet6_fill_ifaddr(skb, ifa, fillargs); 5110 if (err < 0) 5111 break; 5112 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 5113 next: 5114 ip_idx++; 5115 } 5116 break; 5117 } 5118 case MULTICAST_ADDR: 5119 read_unlock_bh(&idev->lock); 5120 fillargs->event = RTM_GETMULTICAST; 5121 5122 /* multicast address */ 5123 for (ifmca = rcu_dereference(idev->mc_list); 5124 ifmca; 5125 ifmca = rcu_dereference(ifmca->next), ip_idx++) { 5126 if (ip_idx < s_ip_idx) 5127 continue; 5128 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs); 5129 if (err < 0) 5130 break; 5131 } 5132 read_lock_bh(&idev->lock); 5133 break; 5134 case ANYCAST_ADDR: 5135 fillargs->event = RTM_GETANYCAST; 5136 /* anycast address */ 5137 for (ifaca = idev->ac_list; ifaca; 5138 ifaca = ifaca->aca_next, ip_idx++) { 5139 if (ip_idx < s_ip_idx) 5140 continue; 5141 err = inet6_fill_ifacaddr(skb, ifaca, fillargs); 5142 if (err < 0) 5143 break; 5144 } 5145 break; 5146 default: 5147 break; 5148 } 5149 read_unlock_bh(&idev->lock); 5150 cb->args[2] = ip_idx; 5151 return err; 5152 } 5153 5154 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh, 5155 struct inet6_fill_args *fillargs, 5156 struct net **tgt_net, struct sock *sk, 5157 struct netlink_callback *cb) 5158 { 5159 struct netlink_ext_ack *extack = cb->extack; 5160 struct nlattr *tb[IFA_MAX+1]; 5161 struct ifaddrmsg *ifm; 5162 int err, i; 5163 5164 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5165 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request"); 5166 return -EINVAL; 5167 } 5168 5169 ifm = nlmsg_data(nlh); 5170 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5171 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request"); 5172 return -EINVAL; 5173 } 5174 5175 fillargs->ifindex = ifm->ifa_index; 5176 if (fillargs->ifindex) { 5177 cb->answer_flags |= NLM_F_DUMP_FILTERED; 5178 fillargs->flags |= NLM_F_DUMP_FILTERED; 5179 } 5180 5181 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5182 ifa_ipv6_policy, extack); 5183 if (err < 0) 5184 return err; 5185 5186 for (i = 0; i <= IFA_MAX; ++i) { 5187 if (!tb[i]) 5188 continue; 5189 5190 if (i == IFA_TARGET_NETNSID) { 5191 struct net *net; 5192 5193 fillargs->netnsid = nla_get_s32(tb[i]); 5194 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid); 5195 if (IS_ERR(net)) { 5196 fillargs->netnsid = -1; 5197 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id"); 5198 return PTR_ERR(net); 5199 } 5200 *tgt_net = net; 5201 } else { 5202 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); 5203 return -EINVAL; 5204 } 5205 } 5206 5207 return 0; 5208 } 5209 5210 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 5211 enum addr_type_t type) 5212 { 5213 const struct nlmsghdr *nlh = cb->nlh; 5214 struct inet6_fill_args fillargs = { 5215 .portid = NETLINK_CB(cb->skb).portid, 5216 .seq = cb->nlh->nlmsg_seq, 5217 .flags = NLM_F_MULTI, 5218 .netnsid = -1, 5219 .type = type, 5220 }; 5221 struct net *tgt_net = sock_net(skb->sk); 5222 int idx, s_idx, s_ip_idx; 5223 int h, s_h; 5224 struct net_device *dev; 5225 struct inet6_dev *idev; 5226 struct hlist_head *head; 5227 int err = 0; 5228 5229 s_h = cb->args[0]; 5230 s_idx = idx = cb->args[1]; 5231 s_ip_idx = cb->args[2]; 5232 5233 if (cb->strict_check) { 5234 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net, 5235 skb->sk, cb); 5236 if (err < 0) 5237 goto put_tgt_net; 5238 5239 err = 0; 5240 if (fillargs.ifindex) { 5241 dev = __dev_get_by_index(tgt_net, fillargs.ifindex); 5242 if (!dev) { 5243 err = -ENODEV; 5244 goto put_tgt_net; 5245 } 5246 idev = __in6_dev_get(dev); 5247 if (idev) { 5248 err = in6_dump_addrs(idev, skb, cb, s_ip_idx, 5249 &fillargs); 5250 if (err > 0) 5251 err = 0; 5252 } 5253 goto put_tgt_net; 5254 } 5255 } 5256 5257 rcu_read_lock(); 5258 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq; 5259 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5260 idx = 0; 5261 head = &tgt_net->dev_index_head[h]; 5262 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5263 if (idx < s_idx) 5264 goto cont; 5265 if (h > s_h || idx > s_idx) 5266 s_ip_idx = 0; 5267 idev = __in6_dev_get(dev); 5268 if (!idev) 5269 goto cont; 5270 5271 if (in6_dump_addrs(idev, skb, cb, s_ip_idx, 5272 &fillargs) < 0) 5273 goto done; 5274 cont: 5275 idx++; 5276 } 5277 } 5278 done: 5279 rcu_read_unlock(); 5280 cb->args[0] = h; 5281 cb->args[1] = idx; 5282 put_tgt_net: 5283 if (fillargs.netnsid >= 0) 5284 put_net(tgt_net); 5285 5286 return skb->len ? : err; 5287 } 5288 5289 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 5290 { 5291 enum addr_type_t type = UNICAST_ADDR; 5292 5293 return inet6_dump_addr(skb, cb, type); 5294 } 5295 5296 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 5297 { 5298 enum addr_type_t type = MULTICAST_ADDR; 5299 5300 return inet6_dump_addr(skb, cb, type); 5301 } 5302 5303 5304 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 5305 { 5306 enum addr_type_t type = ANYCAST_ADDR; 5307 5308 return inet6_dump_addr(skb, cb, type); 5309 } 5310 5311 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb, 5312 const struct nlmsghdr *nlh, 5313 struct nlattr **tb, 5314 struct netlink_ext_ack *extack) 5315 { 5316 struct ifaddrmsg *ifm; 5317 int i, err; 5318 5319 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5320 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request"); 5321 return -EINVAL; 5322 } 5323 5324 if (!netlink_strict_get_check(skb)) 5325 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 5326 ifa_ipv6_policy, extack); 5327 5328 ifm = nlmsg_data(nlh); 5329 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5330 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request"); 5331 return -EINVAL; 5332 } 5333 5334 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5335 ifa_ipv6_policy, extack); 5336 if (err) 5337 return err; 5338 5339 for (i = 0; i <= IFA_MAX; i++) { 5340 if (!tb[i]) 5341 continue; 5342 5343 switch (i) { 5344 case IFA_TARGET_NETNSID: 5345 case IFA_ADDRESS: 5346 case IFA_LOCAL: 5347 break; 5348 default: 5349 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request"); 5350 return -EINVAL; 5351 } 5352 } 5353 5354 return 0; 5355 } 5356 5357 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 5358 struct netlink_ext_ack *extack) 5359 { 5360 struct net *tgt_net = sock_net(in_skb->sk); 5361 struct inet6_fill_args fillargs = { 5362 .portid = NETLINK_CB(in_skb).portid, 5363 .seq = nlh->nlmsg_seq, 5364 .event = RTM_NEWADDR, 5365 .flags = 0, 5366 .netnsid = -1, 5367 }; 5368 struct ifaddrmsg *ifm; 5369 struct nlattr *tb[IFA_MAX+1]; 5370 struct in6_addr *addr = NULL, *peer; 5371 struct net_device *dev = NULL; 5372 struct inet6_ifaddr *ifa; 5373 struct sk_buff *skb; 5374 int err; 5375 5376 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack); 5377 if (err < 0) 5378 return err; 5379 5380 if (tb[IFA_TARGET_NETNSID]) { 5381 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]); 5382 5383 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk, 5384 fillargs.netnsid); 5385 if (IS_ERR(tgt_net)) 5386 return PTR_ERR(tgt_net); 5387 } 5388 5389 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 5390 if (!addr) 5391 return -EINVAL; 5392 5393 ifm = nlmsg_data(nlh); 5394 if (ifm->ifa_index) 5395 dev = dev_get_by_index(tgt_net, ifm->ifa_index); 5396 5397 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1); 5398 if (!ifa) { 5399 err = -EADDRNOTAVAIL; 5400 goto errout; 5401 } 5402 5403 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 5404 if (!skb) { 5405 err = -ENOBUFS; 5406 goto errout_ifa; 5407 } 5408 5409 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5410 if (err < 0) { 5411 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5412 WARN_ON(err == -EMSGSIZE); 5413 kfree_skb(skb); 5414 goto errout_ifa; 5415 } 5416 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid); 5417 errout_ifa: 5418 in6_ifa_put(ifa); 5419 errout: 5420 if (dev) 5421 dev_put(dev); 5422 if (fillargs.netnsid >= 0) 5423 put_net(tgt_net); 5424 5425 return err; 5426 } 5427 5428 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 5429 { 5430 struct sk_buff *skb; 5431 struct net *net = dev_net(ifa->idev->dev); 5432 struct inet6_fill_args fillargs = { 5433 .portid = 0, 5434 .seq = 0, 5435 .event = event, 5436 .flags = 0, 5437 .netnsid = -1, 5438 }; 5439 int err = -ENOBUFS; 5440 5441 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 5442 if (!skb) 5443 goto errout; 5444 5445 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5446 if (err < 0) { 5447 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5448 WARN_ON(err == -EMSGSIZE); 5449 kfree_skb(skb); 5450 goto errout; 5451 } 5452 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 5453 return; 5454 errout: 5455 if (err < 0) 5456 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 5457 } 5458 5459 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 5460 __s32 *array, int bytes) 5461 { 5462 BUG_ON(bytes < (DEVCONF_MAX * 4)); 5463 5464 memset(array, 0, bytes); 5465 array[DEVCONF_FORWARDING] = cnf->forwarding; 5466 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 5467 array[DEVCONF_MTU6] = cnf->mtu6; 5468 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 5469 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 5470 array[DEVCONF_AUTOCONF] = cnf->autoconf; 5471 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 5472 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 5473 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5474 jiffies_to_msecs(cnf->rtr_solicit_interval); 5475 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5476 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 5477 array[DEVCONF_RTR_SOLICIT_DELAY] = 5478 jiffies_to_msecs(cnf->rtr_solicit_delay); 5479 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 5480 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5481 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 5482 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5483 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 5484 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 5485 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 5486 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 5487 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 5488 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 5489 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 5490 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 5491 array[DEVCONF_RA_DEFRTR_METRIC] = cnf->ra_defrtr_metric; 5492 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 5493 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 5494 #ifdef CONFIG_IPV6_ROUTER_PREF 5495 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 5496 array[DEVCONF_RTR_PROBE_INTERVAL] = 5497 jiffies_to_msecs(cnf->rtr_probe_interval); 5498 #ifdef CONFIG_IPV6_ROUTE_INFO 5499 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen; 5500 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 5501 #endif 5502 #endif 5503 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 5504 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 5505 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5506 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 5507 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 5508 #endif 5509 #ifdef CONFIG_IPV6_MROUTE 5510 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 5511 #endif 5512 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 5513 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 5514 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 5515 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 5516 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 5517 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 5518 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 5519 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 5520 /* we omit DEVCONF_STABLE_SECRET for now */ 5521 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 5522 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 5523 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 5524 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5525 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5526 #ifdef CONFIG_IPV6_SEG6_HMAC 5527 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5528 #endif 5529 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5530 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5531 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy; 5532 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass; 5533 array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled; 5534 array[DEVCONF_IOAM6_ENABLED] = cnf->ioam6_enabled; 5535 array[DEVCONF_IOAM6_ID] = cnf->ioam6_id; 5536 array[DEVCONF_IOAM6_ID_WIDE] = cnf->ioam6_id_wide; 5537 } 5538 5539 static inline size_t inet6_ifla6_size(void) 5540 { 5541 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5542 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5543 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5544 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5545 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5546 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */ 5547 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */ 5548 + 0; 5549 } 5550 5551 static inline size_t inet6_if_nlmsg_size(void) 5552 { 5553 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5554 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5555 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5556 + nla_total_size(4) /* IFLA_MTU */ 5557 + nla_total_size(4) /* IFLA_LINK */ 5558 + nla_total_size(1) /* IFLA_OPERSTATE */ 5559 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5560 } 5561 5562 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5563 int bytes) 5564 { 5565 int i; 5566 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5567 BUG_ON(pad < 0); 5568 5569 /* Use put_unaligned() because stats may not be aligned for u64. */ 5570 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5571 for (i = 1; i < ICMP6_MIB_MAX; i++) 5572 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5573 5574 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5575 } 5576 5577 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5578 int bytes, size_t syncpoff) 5579 { 5580 int i, c; 5581 u64 buff[IPSTATS_MIB_MAX]; 5582 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5583 5584 BUG_ON(pad < 0); 5585 5586 memset(buff, 0, sizeof(buff)); 5587 buff[0] = IPSTATS_MIB_MAX; 5588 5589 for_each_possible_cpu(c) { 5590 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5591 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5592 } 5593 5594 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5595 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5596 } 5597 5598 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5599 int bytes) 5600 { 5601 switch (attrtype) { 5602 case IFLA_INET6_STATS: 5603 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5604 offsetof(struct ipstats_mib, syncp)); 5605 break; 5606 case IFLA_INET6_ICMP6STATS: 5607 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5608 break; 5609 } 5610 } 5611 5612 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5613 u32 ext_filter_mask) 5614 { 5615 struct nlattr *nla; 5616 struct ifla_cacheinfo ci; 5617 5618 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5619 goto nla_put_failure; 5620 ci.max_reasm_len = IPV6_MAXPLEN; 5621 ci.tstamp = cstamp_delta(idev->tstamp); 5622 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5623 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5624 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5625 goto nla_put_failure; 5626 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5627 if (!nla) 5628 goto nla_put_failure; 5629 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5630 5631 /* XXX - MC not implemented */ 5632 5633 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5634 return 0; 5635 5636 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5637 if (!nla) 5638 goto nla_put_failure; 5639 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5640 5641 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5642 if (!nla) 5643 goto nla_put_failure; 5644 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5645 5646 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5647 if (!nla) 5648 goto nla_put_failure; 5649 read_lock_bh(&idev->lock); 5650 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5651 read_unlock_bh(&idev->lock); 5652 5653 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5654 goto nla_put_failure; 5655 5656 return 0; 5657 5658 nla_put_failure: 5659 return -EMSGSIZE; 5660 } 5661 5662 static size_t inet6_get_link_af_size(const struct net_device *dev, 5663 u32 ext_filter_mask) 5664 { 5665 if (!__in6_dev_get(dev)) 5666 return 0; 5667 5668 return inet6_ifla6_size(); 5669 } 5670 5671 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5672 u32 ext_filter_mask) 5673 { 5674 struct inet6_dev *idev = __in6_dev_get(dev); 5675 5676 if (!idev) 5677 return -ENODATA; 5678 5679 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5680 return -EMSGSIZE; 5681 5682 return 0; 5683 } 5684 5685 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token, 5686 struct netlink_ext_ack *extack) 5687 { 5688 struct inet6_ifaddr *ifp; 5689 struct net_device *dev = idev->dev; 5690 bool clear_token, update_rs = false; 5691 struct in6_addr ll_addr; 5692 5693 ASSERT_RTNL(); 5694 5695 if (!token) 5696 return -EINVAL; 5697 5698 if (dev->flags & IFF_LOOPBACK) { 5699 NL_SET_ERR_MSG_MOD(extack, "Device is loopback"); 5700 return -EINVAL; 5701 } 5702 5703 if (dev->flags & IFF_NOARP) { 5704 NL_SET_ERR_MSG_MOD(extack, 5705 "Device does not do neighbour discovery"); 5706 return -EINVAL; 5707 } 5708 5709 if (!ipv6_accept_ra(idev)) { 5710 NL_SET_ERR_MSG_MOD(extack, 5711 "Router advertisement is disabled on device"); 5712 return -EINVAL; 5713 } 5714 5715 if (idev->cnf.rtr_solicits == 0) { 5716 NL_SET_ERR_MSG(extack, 5717 "Router solicitation is disabled on device"); 5718 return -EINVAL; 5719 } 5720 5721 write_lock_bh(&idev->lock); 5722 5723 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5724 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5725 5726 write_unlock_bh(&idev->lock); 5727 5728 clear_token = ipv6_addr_any(token); 5729 if (clear_token) 5730 goto update_lft; 5731 5732 if (!idev->dead && (idev->if_flags & IF_READY) && 5733 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5734 IFA_F_OPTIMISTIC)) { 5735 /* If we're not ready, then normal ifup will take care 5736 * of this. Otherwise, we need to request our rs here. 5737 */ 5738 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5739 update_rs = true; 5740 } 5741 5742 update_lft: 5743 write_lock_bh(&idev->lock); 5744 5745 if (update_rs) { 5746 idev->if_flags |= IF_RS_SENT; 5747 idev->rs_interval = rfc3315_s14_backoff_init( 5748 idev->cnf.rtr_solicit_interval); 5749 idev->rs_probes = 1; 5750 addrconf_mod_rs_timer(idev, idev->rs_interval); 5751 } 5752 5753 /* Well, that's kinda nasty ... */ 5754 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5755 spin_lock(&ifp->lock); 5756 if (ifp->tokenized) { 5757 ifp->valid_lft = 0; 5758 ifp->prefered_lft = 0; 5759 } 5760 spin_unlock(&ifp->lock); 5761 } 5762 5763 write_unlock_bh(&idev->lock); 5764 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5765 addrconf_verify_rtnl(); 5766 return 0; 5767 } 5768 5769 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5770 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5771 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5772 }; 5773 5774 static int check_addr_gen_mode(int mode) 5775 { 5776 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5777 mode != IN6_ADDR_GEN_MODE_NONE && 5778 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5779 mode != IN6_ADDR_GEN_MODE_RANDOM) 5780 return -EINVAL; 5781 return 1; 5782 } 5783 5784 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5785 int mode) 5786 { 5787 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5788 !idev->cnf.stable_secret.initialized && 5789 !net->ipv6.devconf_dflt->stable_secret.initialized) 5790 return -EINVAL; 5791 return 1; 5792 } 5793 5794 static int inet6_validate_link_af(const struct net_device *dev, 5795 const struct nlattr *nla) 5796 { 5797 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5798 struct inet6_dev *idev = NULL; 5799 int err; 5800 5801 if (dev) { 5802 idev = __in6_dev_get(dev); 5803 if (!idev) 5804 return -EAFNOSUPPORT; 5805 } 5806 5807 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, 5808 inet6_af_policy, NULL); 5809 if (err) 5810 return err; 5811 5812 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE]) 5813 return -EINVAL; 5814 5815 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5816 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5817 5818 if (check_addr_gen_mode(mode) < 0) 5819 return -EINVAL; 5820 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0) 5821 return -EINVAL; 5822 } 5823 5824 return 0; 5825 } 5826 5827 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla, 5828 struct netlink_ext_ack *extack) 5829 { 5830 struct inet6_dev *idev = __in6_dev_get(dev); 5831 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5832 int err; 5833 5834 if (!idev) 5835 return -EAFNOSUPPORT; 5836 5837 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 5838 return -EINVAL; 5839 5840 if (tb[IFLA_INET6_TOKEN]) { 5841 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]), 5842 extack); 5843 if (err) 5844 return err; 5845 } 5846 5847 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5848 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5849 5850 idev->cnf.addr_gen_mode = mode; 5851 } 5852 5853 return 0; 5854 } 5855 5856 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5857 u32 portid, u32 seq, int event, unsigned int flags) 5858 { 5859 struct net_device *dev = idev->dev; 5860 struct ifinfomsg *hdr; 5861 struct nlmsghdr *nlh; 5862 void *protoinfo; 5863 5864 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5865 if (!nlh) 5866 return -EMSGSIZE; 5867 5868 hdr = nlmsg_data(nlh); 5869 hdr->ifi_family = AF_INET6; 5870 hdr->__ifi_pad = 0; 5871 hdr->ifi_type = dev->type; 5872 hdr->ifi_index = dev->ifindex; 5873 hdr->ifi_flags = dev_get_flags(dev); 5874 hdr->ifi_change = 0; 5875 5876 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5877 (dev->addr_len && 5878 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5879 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5880 (dev->ifindex != dev_get_iflink(dev) && 5881 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5882 nla_put_u8(skb, IFLA_OPERSTATE, 5883 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5884 goto nla_put_failure; 5885 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO); 5886 if (!protoinfo) 5887 goto nla_put_failure; 5888 5889 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5890 goto nla_put_failure; 5891 5892 nla_nest_end(skb, protoinfo); 5893 nlmsg_end(skb, nlh); 5894 return 0; 5895 5896 nla_put_failure: 5897 nlmsg_cancel(skb, nlh); 5898 return -EMSGSIZE; 5899 } 5900 5901 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh, 5902 struct netlink_ext_ack *extack) 5903 { 5904 struct ifinfomsg *ifm; 5905 5906 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5907 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request"); 5908 return -EINVAL; 5909 } 5910 5911 if (nlmsg_attrlen(nlh, sizeof(*ifm))) { 5912 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header"); 5913 return -EINVAL; 5914 } 5915 5916 ifm = nlmsg_data(nlh); 5917 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || 5918 ifm->ifi_change || ifm->ifi_index) { 5919 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request"); 5920 return -EINVAL; 5921 } 5922 5923 return 0; 5924 } 5925 5926 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5927 { 5928 struct net *net = sock_net(skb->sk); 5929 int h, s_h; 5930 int idx = 0, s_idx; 5931 struct net_device *dev; 5932 struct inet6_dev *idev; 5933 struct hlist_head *head; 5934 5935 /* only requests using strict checking can pass data to 5936 * influence the dump 5937 */ 5938 if (cb->strict_check) { 5939 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack); 5940 5941 if (err < 0) 5942 return err; 5943 } 5944 5945 s_h = cb->args[0]; 5946 s_idx = cb->args[1]; 5947 5948 rcu_read_lock(); 5949 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5950 idx = 0; 5951 head = &net->dev_index_head[h]; 5952 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5953 if (idx < s_idx) 5954 goto cont; 5955 idev = __in6_dev_get(dev); 5956 if (!idev) 5957 goto cont; 5958 if (inet6_fill_ifinfo(skb, idev, 5959 NETLINK_CB(cb->skb).portid, 5960 cb->nlh->nlmsg_seq, 5961 RTM_NEWLINK, NLM_F_MULTI) < 0) 5962 goto out; 5963 cont: 5964 idx++; 5965 } 5966 } 5967 out: 5968 rcu_read_unlock(); 5969 cb->args[1] = idx; 5970 cb->args[0] = h; 5971 5972 return skb->len; 5973 } 5974 5975 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5976 { 5977 struct sk_buff *skb; 5978 struct net *net = dev_net(idev->dev); 5979 int err = -ENOBUFS; 5980 5981 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5982 if (!skb) 5983 goto errout; 5984 5985 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5986 if (err < 0) { 5987 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5988 WARN_ON(err == -EMSGSIZE); 5989 kfree_skb(skb); 5990 goto errout; 5991 } 5992 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5993 return; 5994 errout: 5995 if (err < 0) 5996 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5997 } 5998 5999 static inline size_t inet6_prefix_nlmsg_size(void) 6000 { 6001 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 6002 + nla_total_size(sizeof(struct in6_addr)) 6003 + nla_total_size(sizeof(struct prefix_cacheinfo)); 6004 } 6005 6006 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 6007 struct prefix_info *pinfo, u32 portid, u32 seq, 6008 int event, unsigned int flags) 6009 { 6010 struct prefixmsg *pmsg; 6011 struct nlmsghdr *nlh; 6012 struct prefix_cacheinfo ci; 6013 6014 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 6015 if (!nlh) 6016 return -EMSGSIZE; 6017 6018 pmsg = nlmsg_data(nlh); 6019 pmsg->prefix_family = AF_INET6; 6020 pmsg->prefix_pad1 = 0; 6021 pmsg->prefix_pad2 = 0; 6022 pmsg->prefix_ifindex = idev->dev->ifindex; 6023 pmsg->prefix_len = pinfo->prefix_len; 6024 pmsg->prefix_type = pinfo->type; 6025 pmsg->prefix_pad3 = 0; 6026 pmsg->prefix_flags = 0; 6027 if (pinfo->onlink) 6028 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 6029 if (pinfo->autoconf) 6030 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 6031 6032 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 6033 goto nla_put_failure; 6034 ci.preferred_time = ntohl(pinfo->prefered); 6035 ci.valid_time = ntohl(pinfo->valid); 6036 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 6037 goto nla_put_failure; 6038 nlmsg_end(skb, nlh); 6039 return 0; 6040 6041 nla_put_failure: 6042 nlmsg_cancel(skb, nlh); 6043 return -EMSGSIZE; 6044 } 6045 6046 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 6047 struct prefix_info *pinfo) 6048 { 6049 struct sk_buff *skb; 6050 struct net *net = dev_net(idev->dev); 6051 int err = -ENOBUFS; 6052 6053 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 6054 if (!skb) 6055 goto errout; 6056 6057 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 6058 if (err < 0) { 6059 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 6060 WARN_ON(err == -EMSGSIZE); 6061 kfree_skb(skb); 6062 goto errout; 6063 } 6064 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 6065 return; 6066 errout: 6067 if (err < 0) 6068 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 6069 } 6070 6071 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6072 { 6073 struct net *net = dev_net(ifp->idev->dev); 6074 6075 if (event) 6076 ASSERT_RTNL(); 6077 6078 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 6079 6080 switch (event) { 6081 case RTM_NEWADDR: 6082 /* 6083 * If the address was optimistic we inserted the route at the 6084 * start of our DAD process, so we don't need to do it again. 6085 * If the device was taken down in the middle of the DAD 6086 * cycle there is a race where we could get here without a 6087 * host route, so nothing to insert. That will be fixed when 6088 * the device is brought up. 6089 */ 6090 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) { 6091 ip6_ins_rt(net, ifp->rt); 6092 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) { 6093 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n", 6094 &ifp->addr, ifp->idev->dev->name); 6095 } 6096 6097 if (ifp->idev->cnf.forwarding) 6098 addrconf_join_anycast(ifp); 6099 if (!ipv6_addr_any(&ifp->peer_addr)) 6100 addrconf_prefix_route(&ifp->peer_addr, 128, 6101 ifp->rt_priority, ifp->idev->dev, 6102 0, 0, GFP_ATOMIC); 6103 break; 6104 case RTM_DELADDR: 6105 if (ifp->idev->cnf.forwarding) 6106 addrconf_leave_anycast(ifp); 6107 addrconf_leave_solict(ifp->idev, &ifp->addr); 6108 if (!ipv6_addr_any(&ifp->peer_addr)) { 6109 struct fib6_info *rt; 6110 6111 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 6112 ifp->idev->dev, 0, 0, 6113 false); 6114 if (rt) 6115 ip6_del_rt(net, rt, false); 6116 } 6117 if (ifp->rt) { 6118 ip6_del_rt(net, ifp->rt, false); 6119 ifp->rt = NULL; 6120 } 6121 rt_genid_bump_ipv6(net); 6122 break; 6123 } 6124 atomic_inc(&net->ipv6.dev_addr_genid); 6125 } 6126 6127 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6128 { 6129 if (likely(ifp->idev->dead == 0)) 6130 __ipv6_ifa_notify(event, ifp); 6131 } 6132 6133 #ifdef CONFIG_SYSCTL 6134 6135 static int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 6136 void *buffer, size_t *lenp, loff_t *ppos) 6137 { 6138 int *valp = ctl->data; 6139 int val = *valp; 6140 loff_t pos = *ppos; 6141 struct ctl_table lctl; 6142 int ret; 6143 6144 /* 6145 * ctl->data points to idev->cnf.forwarding, we should 6146 * not modify it until we get the rtnl lock. 6147 */ 6148 lctl = *ctl; 6149 lctl.data = &val; 6150 6151 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6152 6153 if (write) 6154 ret = addrconf_fixup_forwarding(ctl, valp, val); 6155 if (ret) 6156 *ppos = pos; 6157 return ret; 6158 } 6159 6160 static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 6161 void *buffer, size_t *lenp, loff_t *ppos) 6162 { 6163 struct inet6_dev *idev = ctl->extra1; 6164 int min_mtu = IPV6_MIN_MTU; 6165 struct ctl_table lctl; 6166 6167 lctl = *ctl; 6168 lctl.extra1 = &min_mtu; 6169 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 6170 6171 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 6172 } 6173 6174 static void dev_disable_change(struct inet6_dev *idev) 6175 { 6176 struct netdev_notifier_info info; 6177 6178 if (!idev || !idev->dev) 6179 return; 6180 6181 netdev_notifier_info_init(&info, idev->dev); 6182 if (idev->cnf.disable_ipv6) 6183 addrconf_notify(NULL, NETDEV_DOWN, &info); 6184 else 6185 addrconf_notify(NULL, NETDEV_UP, &info); 6186 } 6187 6188 static void addrconf_disable_change(struct net *net, __s32 newf) 6189 { 6190 struct net_device *dev; 6191 struct inet6_dev *idev; 6192 6193 for_each_netdev(net, dev) { 6194 idev = __in6_dev_get(dev); 6195 if (idev) { 6196 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 6197 idev->cnf.disable_ipv6 = newf; 6198 if (changed) 6199 dev_disable_change(idev); 6200 } 6201 } 6202 } 6203 6204 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 6205 { 6206 struct net *net; 6207 int old; 6208 6209 if (!rtnl_trylock()) 6210 return restart_syscall(); 6211 6212 net = (struct net *)table->extra2; 6213 old = *p; 6214 *p = newf; 6215 6216 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 6217 rtnl_unlock(); 6218 return 0; 6219 } 6220 6221 if (p == &net->ipv6.devconf_all->disable_ipv6) { 6222 net->ipv6.devconf_dflt->disable_ipv6 = newf; 6223 addrconf_disable_change(net, newf); 6224 } else if ((!newf) ^ (!old)) 6225 dev_disable_change((struct inet6_dev *)table->extra1); 6226 6227 rtnl_unlock(); 6228 return 0; 6229 } 6230 6231 static int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 6232 void *buffer, size_t *lenp, loff_t *ppos) 6233 { 6234 int *valp = ctl->data; 6235 int val = *valp; 6236 loff_t pos = *ppos; 6237 struct ctl_table lctl; 6238 int ret; 6239 6240 /* 6241 * ctl->data points to idev->cnf.disable_ipv6, we should 6242 * not modify it until we get the rtnl lock. 6243 */ 6244 lctl = *ctl; 6245 lctl.data = &val; 6246 6247 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6248 6249 if (write) 6250 ret = addrconf_disable_ipv6(ctl, valp, val); 6251 if (ret) 6252 *ppos = pos; 6253 return ret; 6254 } 6255 6256 static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 6257 void *buffer, size_t *lenp, loff_t *ppos) 6258 { 6259 int *valp = ctl->data; 6260 int ret; 6261 int old, new; 6262 6263 old = *valp; 6264 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 6265 new = *valp; 6266 6267 if (write && old != new) { 6268 struct net *net = ctl->extra2; 6269 6270 if (!rtnl_trylock()) 6271 return restart_syscall(); 6272 6273 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 6274 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6275 NETCONFA_PROXY_NEIGH, 6276 NETCONFA_IFINDEX_DEFAULT, 6277 net->ipv6.devconf_dflt); 6278 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 6279 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6280 NETCONFA_PROXY_NEIGH, 6281 NETCONFA_IFINDEX_ALL, 6282 net->ipv6.devconf_all); 6283 else { 6284 struct inet6_dev *idev = ctl->extra1; 6285 6286 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6287 NETCONFA_PROXY_NEIGH, 6288 idev->dev->ifindex, 6289 &idev->cnf); 6290 } 6291 rtnl_unlock(); 6292 } 6293 6294 return ret; 6295 } 6296 6297 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 6298 void *buffer, size_t *lenp, 6299 loff_t *ppos) 6300 { 6301 int ret = 0; 6302 u32 new_val; 6303 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 6304 struct net *net = (struct net *)ctl->extra2; 6305 struct ctl_table tmp = { 6306 .data = &new_val, 6307 .maxlen = sizeof(new_val), 6308 .mode = ctl->mode, 6309 }; 6310 6311 if (!rtnl_trylock()) 6312 return restart_syscall(); 6313 6314 new_val = *((u32 *)ctl->data); 6315 6316 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos); 6317 if (ret != 0) 6318 goto out; 6319 6320 if (write) { 6321 if (check_addr_gen_mode(new_val) < 0) { 6322 ret = -EINVAL; 6323 goto out; 6324 } 6325 6326 if (idev) { 6327 if (check_stable_privacy(idev, net, new_val) < 0) { 6328 ret = -EINVAL; 6329 goto out; 6330 } 6331 6332 if (idev->cnf.addr_gen_mode != new_val) { 6333 idev->cnf.addr_gen_mode = new_val; 6334 addrconf_dev_config(idev->dev); 6335 } 6336 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) { 6337 struct net_device *dev; 6338 6339 net->ipv6.devconf_dflt->addr_gen_mode = new_val; 6340 for_each_netdev(net, dev) { 6341 idev = __in6_dev_get(dev); 6342 if (idev && 6343 idev->cnf.addr_gen_mode != new_val) { 6344 idev->cnf.addr_gen_mode = new_val; 6345 addrconf_dev_config(idev->dev); 6346 } 6347 } 6348 } 6349 6350 *((u32 *)ctl->data) = new_val; 6351 } 6352 6353 out: 6354 rtnl_unlock(); 6355 6356 return ret; 6357 } 6358 6359 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 6360 void *buffer, size_t *lenp, 6361 loff_t *ppos) 6362 { 6363 int err; 6364 struct in6_addr addr; 6365 char str[IPV6_MAX_STRLEN]; 6366 struct ctl_table lctl = *ctl; 6367 struct net *net = ctl->extra2; 6368 struct ipv6_stable_secret *secret = ctl->data; 6369 6370 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 6371 return -EIO; 6372 6373 lctl.maxlen = IPV6_MAX_STRLEN; 6374 lctl.data = str; 6375 6376 if (!rtnl_trylock()) 6377 return restart_syscall(); 6378 6379 if (!write && !secret->initialized) { 6380 err = -EIO; 6381 goto out; 6382 } 6383 6384 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 6385 if (err >= sizeof(str)) { 6386 err = -EIO; 6387 goto out; 6388 } 6389 6390 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 6391 if (err || !write) 6392 goto out; 6393 6394 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 6395 err = -EIO; 6396 goto out; 6397 } 6398 6399 secret->initialized = true; 6400 secret->secret = addr; 6401 6402 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 6403 struct net_device *dev; 6404 6405 for_each_netdev(net, dev) { 6406 struct inet6_dev *idev = __in6_dev_get(dev); 6407 6408 if (idev) { 6409 idev->cnf.addr_gen_mode = 6410 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6411 } 6412 } 6413 } else { 6414 struct inet6_dev *idev = ctl->extra1; 6415 6416 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6417 } 6418 6419 out: 6420 rtnl_unlock(); 6421 6422 return err; 6423 } 6424 6425 static 6426 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 6427 int write, void *buffer, 6428 size_t *lenp, 6429 loff_t *ppos) 6430 { 6431 int *valp = ctl->data; 6432 int val = *valp; 6433 loff_t pos = *ppos; 6434 struct ctl_table lctl; 6435 int ret; 6436 6437 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 6438 * we should not modify it until we get the rtnl lock. 6439 */ 6440 lctl = *ctl; 6441 lctl.data = &val; 6442 6443 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6444 6445 if (write) 6446 ret = addrconf_fixup_linkdown(ctl, valp, val); 6447 if (ret) 6448 *ppos = pos; 6449 return ret; 6450 } 6451 6452 static 6453 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 6454 { 6455 if (rt) { 6456 if (action) 6457 rt->dst.flags |= DST_NOPOLICY; 6458 else 6459 rt->dst.flags &= ~DST_NOPOLICY; 6460 } 6461 } 6462 6463 static 6464 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 6465 { 6466 struct inet6_ifaddr *ifa; 6467 6468 read_lock_bh(&idev->lock); 6469 list_for_each_entry(ifa, &idev->addr_list, if_list) { 6470 spin_lock(&ifa->lock); 6471 if (ifa->rt) { 6472 /* host routes only use builtin fib6_nh */ 6473 struct fib6_nh *nh = ifa->rt->fib6_nh; 6474 int cpu; 6475 6476 rcu_read_lock(); 6477 ifa->rt->dst_nopolicy = val ? true : false; 6478 if (nh->rt6i_pcpu) { 6479 for_each_possible_cpu(cpu) { 6480 struct rt6_info **rtp; 6481 6482 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu); 6483 addrconf_set_nopolicy(*rtp, val); 6484 } 6485 } 6486 rcu_read_unlock(); 6487 } 6488 spin_unlock(&ifa->lock); 6489 } 6490 read_unlock_bh(&idev->lock); 6491 } 6492 6493 static 6494 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 6495 { 6496 struct inet6_dev *idev; 6497 struct net *net; 6498 6499 if (!rtnl_trylock()) 6500 return restart_syscall(); 6501 6502 *valp = val; 6503 6504 net = (struct net *)ctl->extra2; 6505 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 6506 rtnl_unlock(); 6507 return 0; 6508 } 6509 6510 if (valp == &net->ipv6.devconf_all->disable_policy) { 6511 struct net_device *dev; 6512 6513 for_each_netdev(net, dev) { 6514 idev = __in6_dev_get(dev); 6515 if (idev) 6516 addrconf_disable_policy_idev(idev, val); 6517 } 6518 } else { 6519 idev = (struct inet6_dev *)ctl->extra1; 6520 addrconf_disable_policy_idev(idev, val); 6521 } 6522 6523 rtnl_unlock(); 6524 return 0; 6525 } 6526 6527 static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 6528 void *buffer, size_t *lenp, loff_t *ppos) 6529 { 6530 int *valp = ctl->data; 6531 int val = *valp; 6532 loff_t pos = *ppos; 6533 struct ctl_table lctl; 6534 int ret; 6535 6536 lctl = *ctl; 6537 lctl.data = &val; 6538 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6539 6540 if (write && (*valp != val)) 6541 ret = addrconf_disable_policy(ctl, valp, val); 6542 6543 if (ret) 6544 *ppos = pos; 6545 6546 return ret; 6547 } 6548 6549 static int minus_one = -1; 6550 static const int two_five_five = 255; 6551 static u32 ioam6_if_id_max = U16_MAX; 6552 6553 static const struct ctl_table addrconf_sysctl[] = { 6554 { 6555 .procname = "forwarding", 6556 .data = &ipv6_devconf.forwarding, 6557 .maxlen = sizeof(int), 6558 .mode = 0644, 6559 .proc_handler = addrconf_sysctl_forward, 6560 }, 6561 { 6562 .procname = "hop_limit", 6563 .data = &ipv6_devconf.hop_limit, 6564 .maxlen = sizeof(int), 6565 .mode = 0644, 6566 .proc_handler = proc_dointvec_minmax, 6567 .extra1 = (void *)SYSCTL_ONE, 6568 .extra2 = (void *)&two_five_five, 6569 }, 6570 { 6571 .procname = "mtu", 6572 .data = &ipv6_devconf.mtu6, 6573 .maxlen = sizeof(int), 6574 .mode = 0644, 6575 .proc_handler = addrconf_sysctl_mtu, 6576 }, 6577 { 6578 .procname = "accept_ra", 6579 .data = &ipv6_devconf.accept_ra, 6580 .maxlen = sizeof(int), 6581 .mode = 0644, 6582 .proc_handler = proc_dointvec, 6583 }, 6584 { 6585 .procname = "accept_redirects", 6586 .data = &ipv6_devconf.accept_redirects, 6587 .maxlen = sizeof(int), 6588 .mode = 0644, 6589 .proc_handler = proc_dointvec, 6590 }, 6591 { 6592 .procname = "autoconf", 6593 .data = &ipv6_devconf.autoconf, 6594 .maxlen = sizeof(int), 6595 .mode = 0644, 6596 .proc_handler = proc_dointvec, 6597 }, 6598 { 6599 .procname = "dad_transmits", 6600 .data = &ipv6_devconf.dad_transmits, 6601 .maxlen = sizeof(int), 6602 .mode = 0644, 6603 .proc_handler = proc_dointvec, 6604 }, 6605 { 6606 .procname = "router_solicitations", 6607 .data = &ipv6_devconf.rtr_solicits, 6608 .maxlen = sizeof(int), 6609 .mode = 0644, 6610 .proc_handler = proc_dointvec_minmax, 6611 .extra1 = &minus_one, 6612 }, 6613 { 6614 .procname = "router_solicitation_interval", 6615 .data = &ipv6_devconf.rtr_solicit_interval, 6616 .maxlen = sizeof(int), 6617 .mode = 0644, 6618 .proc_handler = proc_dointvec_jiffies, 6619 }, 6620 { 6621 .procname = "router_solicitation_max_interval", 6622 .data = &ipv6_devconf.rtr_solicit_max_interval, 6623 .maxlen = sizeof(int), 6624 .mode = 0644, 6625 .proc_handler = proc_dointvec_jiffies, 6626 }, 6627 { 6628 .procname = "router_solicitation_delay", 6629 .data = &ipv6_devconf.rtr_solicit_delay, 6630 .maxlen = sizeof(int), 6631 .mode = 0644, 6632 .proc_handler = proc_dointvec_jiffies, 6633 }, 6634 { 6635 .procname = "force_mld_version", 6636 .data = &ipv6_devconf.force_mld_version, 6637 .maxlen = sizeof(int), 6638 .mode = 0644, 6639 .proc_handler = proc_dointvec, 6640 }, 6641 { 6642 .procname = "mldv1_unsolicited_report_interval", 6643 .data = 6644 &ipv6_devconf.mldv1_unsolicited_report_interval, 6645 .maxlen = sizeof(int), 6646 .mode = 0644, 6647 .proc_handler = proc_dointvec_ms_jiffies, 6648 }, 6649 { 6650 .procname = "mldv2_unsolicited_report_interval", 6651 .data = 6652 &ipv6_devconf.mldv2_unsolicited_report_interval, 6653 .maxlen = sizeof(int), 6654 .mode = 0644, 6655 .proc_handler = proc_dointvec_ms_jiffies, 6656 }, 6657 { 6658 .procname = "use_tempaddr", 6659 .data = &ipv6_devconf.use_tempaddr, 6660 .maxlen = sizeof(int), 6661 .mode = 0644, 6662 .proc_handler = proc_dointvec, 6663 }, 6664 { 6665 .procname = "temp_valid_lft", 6666 .data = &ipv6_devconf.temp_valid_lft, 6667 .maxlen = sizeof(int), 6668 .mode = 0644, 6669 .proc_handler = proc_dointvec, 6670 }, 6671 { 6672 .procname = "temp_prefered_lft", 6673 .data = &ipv6_devconf.temp_prefered_lft, 6674 .maxlen = sizeof(int), 6675 .mode = 0644, 6676 .proc_handler = proc_dointvec, 6677 }, 6678 { 6679 .procname = "regen_max_retry", 6680 .data = &ipv6_devconf.regen_max_retry, 6681 .maxlen = sizeof(int), 6682 .mode = 0644, 6683 .proc_handler = proc_dointvec, 6684 }, 6685 { 6686 .procname = "max_desync_factor", 6687 .data = &ipv6_devconf.max_desync_factor, 6688 .maxlen = sizeof(int), 6689 .mode = 0644, 6690 .proc_handler = proc_dointvec, 6691 }, 6692 { 6693 .procname = "max_addresses", 6694 .data = &ipv6_devconf.max_addresses, 6695 .maxlen = sizeof(int), 6696 .mode = 0644, 6697 .proc_handler = proc_dointvec, 6698 }, 6699 { 6700 .procname = "accept_ra_defrtr", 6701 .data = &ipv6_devconf.accept_ra_defrtr, 6702 .maxlen = sizeof(int), 6703 .mode = 0644, 6704 .proc_handler = proc_dointvec, 6705 }, 6706 { 6707 .procname = "ra_defrtr_metric", 6708 .data = &ipv6_devconf.ra_defrtr_metric, 6709 .maxlen = sizeof(u32), 6710 .mode = 0644, 6711 .proc_handler = proc_douintvec_minmax, 6712 .extra1 = (void *)SYSCTL_ONE, 6713 }, 6714 { 6715 .procname = "accept_ra_min_hop_limit", 6716 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6717 .maxlen = sizeof(int), 6718 .mode = 0644, 6719 .proc_handler = proc_dointvec, 6720 }, 6721 { 6722 .procname = "accept_ra_pinfo", 6723 .data = &ipv6_devconf.accept_ra_pinfo, 6724 .maxlen = sizeof(int), 6725 .mode = 0644, 6726 .proc_handler = proc_dointvec, 6727 }, 6728 #ifdef CONFIG_IPV6_ROUTER_PREF 6729 { 6730 .procname = "accept_ra_rtr_pref", 6731 .data = &ipv6_devconf.accept_ra_rtr_pref, 6732 .maxlen = sizeof(int), 6733 .mode = 0644, 6734 .proc_handler = proc_dointvec, 6735 }, 6736 { 6737 .procname = "router_probe_interval", 6738 .data = &ipv6_devconf.rtr_probe_interval, 6739 .maxlen = sizeof(int), 6740 .mode = 0644, 6741 .proc_handler = proc_dointvec_jiffies, 6742 }, 6743 #ifdef CONFIG_IPV6_ROUTE_INFO 6744 { 6745 .procname = "accept_ra_rt_info_min_plen", 6746 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6747 .maxlen = sizeof(int), 6748 .mode = 0644, 6749 .proc_handler = proc_dointvec, 6750 }, 6751 { 6752 .procname = "accept_ra_rt_info_max_plen", 6753 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6754 .maxlen = sizeof(int), 6755 .mode = 0644, 6756 .proc_handler = proc_dointvec, 6757 }, 6758 #endif 6759 #endif 6760 { 6761 .procname = "proxy_ndp", 6762 .data = &ipv6_devconf.proxy_ndp, 6763 .maxlen = sizeof(int), 6764 .mode = 0644, 6765 .proc_handler = addrconf_sysctl_proxy_ndp, 6766 }, 6767 { 6768 .procname = "accept_source_route", 6769 .data = &ipv6_devconf.accept_source_route, 6770 .maxlen = sizeof(int), 6771 .mode = 0644, 6772 .proc_handler = proc_dointvec, 6773 }, 6774 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6775 { 6776 .procname = "optimistic_dad", 6777 .data = &ipv6_devconf.optimistic_dad, 6778 .maxlen = sizeof(int), 6779 .mode = 0644, 6780 .proc_handler = proc_dointvec, 6781 }, 6782 { 6783 .procname = "use_optimistic", 6784 .data = &ipv6_devconf.use_optimistic, 6785 .maxlen = sizeof(int), 6786 .mode = 0644, 6787 .proc_handler = proc_dointvec, 6788 }, 6789 #endif 6790 #ifdef CONFIG_IPV6_MROUTE 6791 { 6792 .procname = "mc_forwarding", 6793 .data = &ipv6_devconf.mc_forwarding, 6794 .maxlen = sizeof(int), 6795 .mode = 0444, 6796 .proc_handler = proc_dointvec, 6797 }, 6798 #endif 6799 { 6800 .procname = "disable_ipv6", 6801 .data = &ipv6_devconf.disable_ipv6, 6802 .maxlen = sizeof(int), 6803 .mode = 0644, 6804 .proc_handler = addrconf_sysctl_disable, 6805 }, 6806 { 6807 .procname = "accept_dad", 6808 .data = &ipv6_devconf.accept_dad, 6809 .maxlen = sizeof(int), 6810 .mode = 0644, 6811 .proc_handler = proc_dointvec, 6812 }, 6813 { 6814 .procname = "force_tllao", 6815 .data = &ipv6_devconf.force_tllao, 6816 .maxlen = sizeof(int), 6817 .mode = 0644, 6818 .proc_handler = proc_dointvec 6819 }, 6820 { 6821 .procname = "ndisc_notify", 6822 .data = &ipv6_devconf.ndisc_notify, 6823 .maxlen = sizeof(int), 6824 .mode = 0644, 6825 .proc_handler = proc_dointvec 6826 }, 6827 { 6828 .procname = "suppress_frag_ndisc", 6829 .data = &ipv6_devconf.suppress_frag_ndisc, 6830 .maxlen = sizeof(int), 6831 .mode = 0644, 6832 .proc_handler = proc_dointvec 6833 }, 6834 { 6835 .procname = "accept_ra_from_local", 6836 .data = &ipv6_devconf.accept_ra_from_local, 6837 .maxlen = sizeof(int), 6838 .mode = 0644, 6839 .proc_handler = proc_dointvec, 6840 }, 6841 { 6842 .procname = "accept_ra_mtu", 6843 .data = &ipv6_devconf.accept_ra_mtu, 6844 .maxlen = sizeof(int), 6845 .mode = 0644, 6846 .proc_handler = proc_dointvec, 6847 }, 6848 { 6849 .procname = "stable_secret", 6850 .data = &ipv6_devconf.stable_secret, 6851 .maxlen = IPV6_MAX_STRLEN, 6852 .mode = 0600, 6853 .proc_handler = addrconf_sysctl_stable_secret, 6854 }, 6855 { 6856 .procname = "use_oif_addrs_only", 6857 .data = &ipv6_devconf.use_oif_addrs_only, 6858 .maxlen = sizeof(int), 6859 .mode = 0644, 6860 .proc_handler = proc_dointvec, 6861 }, 6862 { 6863 .procname = "ignore_routes_with_linkdown", 6864 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6865 .maxlen = sizeof(int), 6866 .mode = 0644, 6867 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6868 }, 6869 { 6870 .procname = "drop_unicast_in_l2_multicast", 6871 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6872 .maxlen = sizeof(int), 6873 .mode = 0644, 6874 .proc_handler = proc_dointvec, 6875 }, 6876 { 6877 .procname = "drop_unsolicited_na", 6878 .data = &ipv6_devconf.drop_unsolicited_na, 6879 .maxlen = sizeof(int), 6880 .mode = 0644, 6881 .proc_handler = proc_dointvec, 6882 }, 6883 { 6884 .procname = "keep_addr_on_down", 6885 .data = &ipv6_devconf.keep_addr_on_down, 6886 .maxlen = sizeof(int), 6887 .mode = 0644, 6888 .proc_handler = proc_dointvec, 6889 6890 }, 6891 { 6892 .procname = "seg6_enabled", 6893 .data = &ipv6_devconf.seg6_enabled, 6894 .maxlen = sizeof(int), 6895 .mode = 0644, 6896 .proc_handler = proc_dointvec, 6897 }, 6898 #ifdef CONFIG_IPV6_SEG6_HMAC 6899 { 6900 .procname = "seg6_require_hmac", 6901 .data = &ipv6_devconf.seg6_require_hmac, 6902 .maxlen = sizeof(int), 6903 .mode = 0644, 6904 .proc_handler = proc_dointvec, 6905 }, 6906 #endif 6907 { 6908 .procname = "enhanced_dad", 6909 .data = &ipv6_devconf.enhanced_dad, 6910 .maxlen = sizeof(int), 6911 .mode = 0644, 6912 .proc_handler = proc_dointvec, 6913 }, 6914 { 6915 .procname = "addr_gen_mode", 6916 .data = &ipv6_devconf.addr_gen_mode, 6917 .maxlen = sizeof(int), 6918 .mode = 0644, 6919 .proc_handler = addrconf_sysctl_addr_gen_mode, 6920 }, 6921 { 6922 .procname = "disable_policy", 6923 .data = &ipv6_devconf.disable_policy, 6924 .maxlen = sizeof(int), 6925 .mode = 0644, 6926 .proc_handler = addrconf_sysctl_disable_policy, 6927 }, 6928 { 6929 .procname = "ndisc_tclass", 6930 .data = &ipv6_devconf.ndisc_tclass, 6931 .maxlen = sizeof(int), 6932 .mode = 0644, 6933 .proc_handler = proc_dointvec_minmax, 6934 .extra1 = (void *)SYSCTL_ZERO, 6935 .extra2 = (void *)&two_five_five, 6936 }, 6937 { 6938 .procname = "rpl_seg_enabled", 6939 .data = &ipv6_devconf.rpl_seg_enabled, 6940 .maxlen = sizeof(int), 6941 .mode = 0644, 6942 .proc_handler = proc_dointvec, 6943 }, 6944 { 6945 .procname = "ioam6_enabled", 6946 .data = &ipv6_devconf.ioam6_enabled, 6947 .maxlen = sizeof(u8), 6948 .mode = 0644, 6949 .proc_handler = proc_dou8vec_minmax, 6950 .extra1 = (void *)SYSCTL_ZERO, 6951 .extra2 = (void *)SYSCTL_ONE, 6952 }, 6953 { 6954 .procname = "ioam6_id", 6955 .data = &ipv6_devconf.ioam6_id, 6956 .maxlen = sizeof(u32), 6957 .mode = 0644, 6958 .proc_handler = proc_douintvec_minmax, 6959 .extra1 = (void *)SYSCTL_ZERO, 6960 .extra2 = (void *)&ioam6_if_id_max, 6961 }, 6962 { 6963 .procname = "ioam6_id_wide", 6964 .data = &ipv6_devconf.ioam6_id_wide, 6965 .maxlen = sizeof(u32), 6966 .mode = 0644, 6967 .proc_handler = proc_douintvec, 6968 }, 6969 { 6970 /* sentinel */ 6971 } 6972 }; 6973 6974 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 6975 struct inet6_dev *idev, struct ipv6_devconf *p) 6976 { 6977 int i, ifindex; 6978 struct ctl_table *table; 6979 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 6980 6981 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 6982 if (!table) 6983 goto out; 6984 6985 for (i = 0; table[i].data; i++) { 6986 table[i].data += (char *)p - (char *)&ipv6_devconf; 6987 /* If one of these is already set, then it is not safe to 6988 * overwrite either of them: this makes proc_dointvec_minmax 6989 * usable. 6990 */ 6991 if (!table[i].extra1 && !table[i].extra2) { 6992 table[i].extra1 = idev; /* embedded; no ref */ 6993 table[i].extra2 = net; 6994 } 6995 } 6996 6997 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 6998 6999 p->sysctl_header = register_net_sysctl(net, path, table); 7000 if (!p->sysctl_header) 7001 goto free; 7002 7003 if (!strcmp(dev_name, "all")) 7004 ifindex = NETCONFA_IFINDEX_ALL; 7005 else if (!strcmp(dev_name, "default")) 7006 ifindex = NETCONFA_IFINDEX_DEFAULT; 7007 else 7008 ifindex = idev->dev->ifindex; 7009 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 7010 ifindex, p); 7011 return 0; 7012 7013 free: 7014 kfree(table); 7015 out: 7016 return -ENOBUFS; 7017 } 7018 7019 static void __addrconf_sysctl_unregister(struct net *net, 7020 struct ipv6_devconf *p, int ifindex) 7021 { 7022 struct ctl_table *table; 7023 7024 if (!p->sysctl_header) 7025 return; 7026 7027 table = p->sysctl_header->ctl_table_arg; 7028 unregister_net_sysctl_table(p->sysctl_header); 7029 p->sysctl_header = NULL; 7030 kfree(table); 7031 7032 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 7033 } 7034 7035 static int addrconf_sysctl_register(struct inet6_dev *idev) 7036 { 7037 int err; 7038 7039 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 7040 return -EINVAL; 7041 7042 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 7043 &ndisc_ifinfo_sysctl_change); 7044 if (err) 7045 return err; 7046 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 7047 idev, &idev->cnf); 7048 if (err) 7049 neigh_sysctl_unregister(idev->nd_parms); 7050 7051 return err; 7052 } 7053 7054 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 7055 { 7056 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 7057 idev->dev->ifindex); 7058 neigh_sysctl_unregister(idev->nd_parms); 7059 } 7060 7061 7062 #endif 7063 7064 static int __net_init addrconf_init_net(struct net *net) 7065 { 7066 int err = -ENOMEM; 7067 struct ipv6_devconf *all, *dflt; 7068 7069 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 7070 if (!all) 7071 goto err_alloc_all; 7072 7073 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 7074 if (!dflt) 7075 goto err_alloc_dflt; 7076 7077 if (IS_ENABLED(CONFIG_SYSCTL) && 7078 !net_eq(net, &init_net)) { 7079 switch (sysctl_devconf_inherit_init_net) { 7080 case 1: /* copy from init_net */ 7081 memcpy(all, init_net.ipv6.devconf_all, 7082 sizeof(ipv6_devconf)); 7083 memcpy(dflt, init_net.ipv6.devconf_dflt, 7084 sizeof(ipv6_devconf_dflt)); 7085 break; 7086 case 3: /* copy from the current netns */ 7087 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all, 7088 sizeof(ipv6_devconf)); 7089 memcpy(dflt, 7090 current->nsproxy->net_ns->ipv6.devconf_dflt, 7091 sizeof(ipv6_devconf_dflt)); 7092 break; 7093 case 0: 7094 case 2: 7095 /* use compiled values */ 7096 break; 7097 } 7098 } 7099 7100 /* these will be inherited by all namespaces */ 7101 dflt->autoconf = ipv6_defaults.autoconf; 7102 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 7103 7104 dflt->stable_secret.initialized = false; 7105 all->stable_secret.initialized = false; 7106 7107 net->ipv6.devconf_all = all; 7108 net->ipv6.devconf_dflt = dflt; 7109 7110 #ifdef CONFIG_SYSCTL 7111 err = __addrconf_sysctl_register(net, "all", NULL, all); 7112 if (err < 0) 7113 goto err_reg_all; 7114 7115 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 7116 if (err < 0) 7117 goto err_reg_dflt; 7118 #endif 7119 return 0; 7120 7121 #ifdef CONFIG_SYSCTL 7122 err_reg_dflt: 7123 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 7124 err_reg_all: 7125 kfree(dflt); 7126 #endif 7127 err_alloc_dflt: 7128 kfree(all); 7129 err_alloc_all: 7130 return err; 7131 } 7132 7133 static void __net_exit addrconf_exit_net(struct net *net) 7134 { 7135 #ifdef CONFIG_SYSCTL 7136 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 7137 NETCONFA_IFINDEX_DEFAULT); 7138 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 7139 NETCONFA_IFINDEX_ALL); 7140 #endif 7141 kfree(net->ipv6.devconf_dflt); 7142 kfree(net->ipv6.devconf_all); 7143 } 7144 7145 static struct pernet_operations addrconf_ops = { 7146 .init = addrconf_init_net, 7147 .exit = addrconf_exit_net, 7148 }; 7149 7150 static struct rtnl_af_ops inet6_ops __read_mostly = { 7151 .family = AF_INET6, 7152 .fill_link_af = inet6_fill_link_af, 7153 .get_link_af_size = inet6_get_link_af_size, 7154 .validate_link_af = inet6_validate_link_af, 7155 .set_link_af = inet6_set_link_af, 7156 }; 7157 7158 /* 7159 * Init / cleanup code 7160 */ 7161 7162 int __init addrconf_init(void) 7163 { 7164 struct inet6_dev *idev; 7165 int i, err; 7166 7167 err = ipv6_addr_label_init(); 7168 if (err < 0) { 7169 pr_crit("%s: cannot initialize default policy table: %d\n", 7170 __func__, err); 7171 goto out; 7172 } 7173 7174 err = register_pernet_subsys(&addrconf_ops); 7175 if (err < 0) 7176 goto out_addrlabel; 7177 7178 addrconf_wq = create_workqueue("ipv6_addrconf"); 7179 if (!addrconf_wq) { 7180 err = -ENOMEM; 7181 goto out_nowq; 7182 } 7183 7184 /* The addrconf netdev notifier requires that loopback_dev 7185 * has it's ipv6 private information allocated and setup 7186 * before it can bring up and give link-local addresses 7187 * to other devices which are up. 7188 * 7189 * Unfortunately, loopback_dev is not necessarily the first 7190 * entry in the global dev_base list of net devices. In fact, 7191 * it is likely to be the very last entry on that list. 7192 * So this causes the notifier registry below to try and 7193 * give link-local addresses to all devices besides loopback_dev 7194 * first, then loopback_dev, which cases all the non-loopback_dev 7195 * devices to fail to get a link-local address. 7196 * 7197 * So, as a temporary fix, allocate the ipv6 structure for 7198 * loopback_dev first by hand. 7199 * Longer term, all of the dependencies ipv6 has upon the loopback 7200 * device and it being up should be removed. 7201 */ 7202 rtnl_lock(); 7203 idev = ipv6_add_dev(init_net.loopback_dev); 7204 rtnl_unlock(); 7205 if (IS_ERR(idev)) { 7206 err = PTR_ERR(idev); 7207 goto errlo; 7208 } 7209 7210 ip6_route_init_special_entries(); 7211 7212 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7213 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 7214 7215 register_netdevice_notifier(&ipv6_dev_notf); 7216 7217 addrconf_verify(); 7218 7219 rtnl_af_register(&inet6_ops); 7220 7221 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK, 7222 NULL, inet6_dump_ifinfo, 0); 7223 if (err < 0) 7224 goto errout; 7225 7226 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR, 7227 inet6_rtm_newaddr, NULL, 0); 7228 if (err < 0) 7229 goto errout; 7230 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR, 7231 inet6_rtm_deladdr, NULL, 0); 7232 if (err < 0) 7233 goto errout; 7234 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR, 7235 inet6_rtm_getaddr, inet6_dump_ifaddr, 7236 RTNL_FLAG_DOIT_UNLOCKED); 7237 if (err < 0) 7238 goto errout; 7239 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST, 7240 NULL, inet6_dump_ifmcaddr, 0); 7241 if (err < 0) 7242 goto errout; 7243 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST, 7244 NULL, inet6_dump_ifacaddr, 0); 7245 if (err < 0) 7246 goto errout; 7247 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF, 7248 inet6_netconf_get_devconf, 7249 inet6_netconf_dump_devconf, 7250 RTNL_FLAG_DOIT_UNLOCKED); 7251 if (err < 0) 7252 goto errout; 7253 err = ipv6_addr_label_rtnl_register(); 7254 if (err < 0) 7255 goto errout; 7256 7257 return 0; 7258 errout: 7259 rtnl_unregister_all(PF_INET6); 7260 rtnl_af_unregister(&inet6_ops); 7261 unregister_netdevice_notifier(&ipv6_dev_notf); 7262 errlo: 7263 destroy_workqueue(addrconf_wq); 7264 out_nowq: 7265 unregister_pernet_subsys(&addrconf_ops); 7266 out_addrlabel: 7267 ipv6_addr_label_cleanup(); 7268 out: 7269 return err; 7270 } 7271 7272 void addrconf_cleanup(void) 7273 { 7274 struct net_device *dev; 7275 int i; 7276 7277 unregister_netdevice_notifier(&ipv6_dev_notf); 7278 unregister_pernet_subsys(&addrconf_ops); 7279 ipv6_addr_label_cleanup(); 7280 7281 rtnl_af_unregister(&inet6_ops); 7282 7283 rtnl_lock(); 7284 7285 /* clean dev list */ 7286 for_each_netdev(&init_net, dev) { 7287 if (__in6_dev_get(dev) == NULL) 7288 continue; 7289 addrconf_ifdown(dev, true); 7290 } 7291 addrconf_ifdown(init_net.loopback_dev, true); 7292 7293 /* 7294 * Check hash table. 7295 */ 7296 spin_lock_bh(&addrconf_hash_lock); 7297 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7298 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 7299 spin_unlock_bh(&addrconf_hash_lock); 7300 cancel_delayed_work(&addr_chk_work); 7301 rtnl_unlock(); 7302 7303 destroy_workqueue(addrconf_wq); 7304 } 7305