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