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 .ndisc_evict_nocarrier = 1, 245 }; 246 247 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 248 .forwarding = 0, 249 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 250 .mtu6 = IPV6_MIN_MTU, 251 .accept_ra = 1, 252 .accept_redirects = 1, 253 .autoconf = 1, 254 .force_mld_version = 0, 255 .mldv1_unsolicited_report_interval = 10 * HZ, 256 .mldv2_unsolicited_report_interval = HZ, 257 .dad_transmits = 1, 258 .rtr_solicits = MAX_RTR_SOLICITATIONS, 259 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 260 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 261 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 262 .use_tempaddr = 0, 263 .temp_valid_lft = TEMP_VALID_LIFETIME, 264 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 265 .regen_max_retry = REGEN_MAX_RETRY, 266 .max_desync_factor = MAX_DESYNC_FACTOR, 267 .max_addresses = IPV6_MAX_ADDRESSES, 268 .accept_ra_defrtr = 1, 269 .ra_defrtr_metric = IP6_RT_PRIO_USER, 270 .accept_ra_from_local = 0, 271 .accept_ra_min_hop_limit= 1, 272 .accept_ra_pinfo = 1, 273 #ifdef CONFIG_IPV6_ROUTER_PREF 274 .accept_ra_rtr_pref = 1, 275 .rtr_probe_interval = 60 * HZ, 276 #ifdef CONFIG_IPV6_ROUTE_INFO 277 .accept_ra_rt_info_min_plen = 0, 278 .accept_ra_rt_info_max_plen = 0, 279 #endif 280 #endif 281 .proxy_ndp = 0, 282 .accept_source_route = 0, /* we do not accept RH0 by default. */ 283 .disable_ipv6 = 0, 284 .accept_dad = 1, 285 .suppress_frag_ndisc = 1, 286 .accept_ra_mtu = 1, 287 .stable_secret = { 288 .initialized = false, 289 }, 290 .use_oif_addrs_only = 0, 291 .ignore_routes_with_linkdown = 0, 292 .keep_addr_on_down = 0, 293 .seg6_enabled = 0, 294 #ifdef CONFIG_IPV6_SEG6_HMAC 295 .seg6_require_hmac = 0, 296 #endif 297 .enhanced_dad = 1, 298 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 299 .disable_policy = 0, 300 .rpl_seg_enabled = 0, 301 .ioam6_enabled = 0, 302 .ioam6_id = IOAM6_DEFAULT_IF_ID, 303 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE, 304 .ndisc_evict_nocarrier = 1, 305 }; 306 307 /* Check if link is ready: is it up and is a valid qdisc available */ 308 static inline bool addrconf_link_ready(const struct net_device *dev) 309 { 310 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev); 311 } 312 313 static void addrconf_del_rs_timer(struct inet6_dev *idev) 314 { 315 if (del_timer(&idev->rs_timer)) 316 __in6_dev_put(idev); 317 } 318 319 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 320 { 321 if (cancel_delayed_work(&ifp->dad_work)) 322 __in6_ifa_put(ifp); 323 } 324 325 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 326 unsigned long when) 327 { 328 if (!timer_pending(&idev->rs_timer)) 329 in6_dev_hold(idev); 330 mod_timer(&idev->rs_timer, jiffies + when); 331 } 332 333 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 334 unsigned long delay) 335 { 336 in6_ifa_hold(ifp); 337 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay)) 338 in6_ifa_put(ifp); 339 } 340 341 static int snmp6_alloc_dev(struct inet6_dev *idev) 342 { 343 int i; 344 345 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib); 346 if (!idev->stats.ipv6) 347 goto err_ip; 348 349 for_each_possible_cpu(i) { 350 struct ipstats_mib *addrconf_stats; 351 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 352 u64_stats_init(&addrconf_stats->syncp); 353 } 354 355 356 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 357 GFP_KERNEL); 358 if (!idev->stats.icmpv6dev) 359 goto err_icmp; 360 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 361 GFP_KERNEL); 362 if (!idev->stats.icmpv6msgdev) 363 goto err_icmpmsg; 364 365 return 0; 366 367 err_icmpmsg: 368 kfree(idev->stats.icmpv6dev); 369 err_icmp: 370 free_percpu(idev->stats.ipv6); 371 err_ip: 372 return -ENOMEM; 373 } 374 375 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 376 { 377 struct inet6_dev *ndev; 378 int err = -ENOMEM; 379 380 ASSERT_RTNL(); 381 382 if (dev->mtu < IPV6_MIN_MTU) 383 return ERR_PTR(-EINVAL); 384 385 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 386 if (!ndev) 387 return ERR_PTR(err); 388 389 rwlock_init(&ndev->lock); 390 ndev->dev = dev; 391 INIT_LIST_HEAD(&ndev->addr_list); 392 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0); 393 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 394 395 if (ndev->cnf.stable_secret.initialized) 396 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 397 398 ndev->cnf.mtu6 = dev->mtu; 399 ndev->ra_mtu = 0; 400 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 401 if (!ndev->nd_parms) { 402 kfree(ndev); 403 return ERR_PTR(err); 404 } 405 if (ndev->cnf.forwarding) 406 dev_disable_lro(dev); 407 /* We refer to the device */ 408 dev_hold_track(dev, &ndev->dev_tracker, GFP_KERNEL); 409 410 if (snmp6_alloc_dev(ndev) < 0) { 411 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n", 412 __func__); 413 neigh_parms_release(&nd_tbl, ndev->nd_parms); 414 dev_put_track(dev, &ndev->dev_tracker); 415 kfree(ndev); 416 return ERR_PTR(err); 417 } 418 419 if (snmp6_register_dev(ndev) < 0) { 420 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n", 421 __func__, dev->name); 422 goto err_release; 423 } 424 425 /* One reference from device. */ 426 refcount_set(&ndev->refcnt, 1); 427 428 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 429 ndev->cnf.accept_dad = -1; 430 431 #if IS_ENABLED(CONFIG_IPV6_SIT) 432 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 433 pr_info("%s: Disabled Multicast RS\n", dev->name); 434 ndev->cnf.rtr_solicits = 0; 435 } 436 #endif 437 438 INIT_LIST_HEAD(&ndev->tempaddr_list); 439 ndev->desync_factor = U32_MAX; 440 if ((dev->flags&IFF_LOOPBACK) || 441 dev->type == ARPHRD_TUNNEL || 442 dev->type == ARPHRD_TUNNEL6 || 443 dev->type == ARPHRD_SIT || 444 dev->type == ARPHRD_NONE) { 445 ndev->cnf.use_tempaddr = -1; 446 } 447 448 ndev->token = in6addr_any; 449 450 if (netif_running(dev) && addrconf_link_ready(dev)) 451 ndev->if_flags |= IF_READY; 452 453 ipv6_mc_init_dev(ndev); 454 ndev->tstamp = jiffies; 455 err = addrconf_sysctl_register(ndev); 456 if (err) { 457 ipv6_mc_destroy_dev(ndev); 458 snmp6_unregister_dev(ndev); 459 goto err_release; 460 } 461 /* protected by rtnl_lock */ 462 rcu_assign_pointer(dev->ip6_ptr, ndev); 463 464 /* Join interface-local all-node multicast group */ 465 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 466 467 /* Join all-node multicast group */ 468 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 469 470 /* Join all-router multicast group if forwarding is set */ 471 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 472 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 473 474 return ndev; 475 476 err_release: 477 neigh_parms_release(&nd_tbl, ndev->nd_parms); 478 ndev->dead = 1; 479 in6_dev_finish_destroy(ndev); 480 return ERR_PTR(err); 481 } 482 483 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 484 { 485 struct inet6_dev *idev; 486 487 ASSERT_RTNL(); 488 489 idev = __in6_dev_get(dev); 490 if (!idev) { 491 idev = ipv6_add_dev(dev); 492 if (IS_ERR(idev)) 493 return idev; 494 } 495 496 if (dev->flags&IFF_UP) 497 ipv6_mc_up(idev); 498 return idev; 499 } 500 501 static int inet6_netconf_msgsize_devconf(int type) 502 { 503 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 504 + nla_total_size(4); /* NETCONFA_IFINDEX */ 505 bool all = false; 506 507 if (type == NETCONFA_ALL) 508 all = true; 509 510 if (all || type == NETCONFA_FORWARDING) 511 size += nla_total_size(4); 512 #ifdef CONFIG_IPV6_MROUTE 513 if (all || type == NETCONFA_MC_FORWARDING) 514 size += nla_total_size(4); 515 #endif 516 if (all || type == NETCONFA_PROXY_NEIGH) 517 size += nla_total_size(4); 518 519 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 520 size += nla_total_size(4); 521 522 return size; 523 } 524 525 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 526 struct ipv6_devconf *devconf, u32 portid, 527 u32 seq, int event, unsigned int flags, 528 int type) 529 { 530 struct nlmsghdr *nlh; 531 struct netconfmsg *ncm; 532 bool all = false; 533 534 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 535 flags); 536 if (!nlh) 537 return -EMSGSIZE; 538 539 if (type == NETCONFA_ALL) 540 all = true; 541 542 ncm = nlmsg_data(nlh); 543 ncm->ncm_family = AF_INET6; 544 545 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 546 goto nla_put_failure; 547 548 if (!devconf) 549 goto out; 550 551 if ((all || type == NETCONFA_FORWARDING) && 552 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 553 goto nla_put_failure; 554 #ifdef CONFIG_IPV6_MROUTE 555 if ((all || type == NETCONFA_MC_FORWARDING) && 556 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 557 devconf->mc_forwarding) < 0) 558 goto nla_put_failure; 559 #endif 560 if ((all || type == NETCONFA_PROXY_NEIGH) && 561 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 562 goto nla_put_failure; 563 564 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 565 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 566 devconf->ignore_routes_with_linkdown) < 0) 567 goto nla_put_failure; 568 569 out: 570 nlmsg_end(skb, nlh); 571 return 0; 572 573 nla_put_failure: 574 nlmsg_cancel(skb, nlh); 575 return -EMSGSIZE; 576 } 577 578 void inet6_netconf_notify_devconf(struct net *net, int event, int type, 579 int ifindex, struct ipv6_devconf *devconf) 580 { 581 struct sk_buff *skb; 582 int err = -ENOBUFS; 583 584 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL); 585 if (!skb) 586 goto errout; 587 588 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 589 event, 0, type); 590 if (err < 0) { 591 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 592 WARN_ON(err == -EMSGSIZE); 593 kfree_skb(skb); 594 goto errout; 595 } 596 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL); 597 return; 598 errout: 599 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 600 } 601 602 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 603 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 604 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 605 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 606 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 607 }; 608 609 static int inet6_netconf_valid_get_req(struct sk_buff *skb, 610 const struct nlmsghdr *nlh, 611 struct nlattr **tb, 612 struct netlink_ext_ack *extack) 613 { 614 int i, err; 615 616 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) { 617 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request"); 618 return -EINVAL; 619 } 620 621 if (!netlink_strict_get_check(skb)) 622 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg), 623 tb, NETCONFA_MAX, 624 devconf_ipv6_policy, extack); 625 626 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg), 627 tb, NETCONFA_MAX, 628 devconf_ipv6_policy, extack); 629 if (err) 630 return err; 631 632 for (i = 0; i <= NETCONFA_MAX; i++) { 633 if (!tb[i]) 634 continue; 635 636 switch (i) { 637 case NETCONFA_IFINDEX: 638 break; 639 default: 640 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request"); 641 return -EINVAL; 642 } 643 } 644 645 return 0; 646 } 647 648 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 649 struct nlmsghdr *nlh, 650 struct netlink_ext_ack *extack) 651 { 652 struct net *net = sock_net(in_skb->sk); 653 struct nlattr *tb[NETCONFA_MAX+1]; 654 struct inet6_dev *in6_dev = NULL; 655 struct net_device *dev = NULL; 656 struct sk_buff *skb; 657 struct ipv6_devconf *devconf; 658 int ifindex; 659 int err; 660 661 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack); 662 if (err < 0) 663 return err; 664 665 if (!tb[NETCONFA_IFINDEX]) 666 return -EINVAL; 667 668 err = -EINVAL; 669 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 670 switch (ifindex) { 671 case NETCONFA_IFINDEX_ALL: 672 devconf = net->ipv6.devconf_all; 673 break; 674 case NETCONFA_IFINDEX_DEFAULT: 675 devconf = net->ipv6.devconf_dflt; 676 break; 677 default: 678 dev = dev_get_by_index(net, ifindex); 679 if (!dev) 680 return -EINVAL; 681 in6_dev = in6_dev_get(dev); 682 if (!in6_dev) 683 goto errout; 684 devconf = &in6_dev->cnf; 685 break; 686 } 687 688 err = -ENOBUFS; 689 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); 690 if (!skb) 691 goto errout; 692 693 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 694 NETLINK_CB(in_skb).portid, 695 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 696 NETCONFA_ALL); 697 if (err < 0) { 698 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 699 WARN_ON(err == -EMSGSIZE); 700 kfree_skb(skb); 701 goto errout; 702 } 703 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 704 errout: 705 if (in6_dev) 706 in6_dev_put(in6_dev); 707 dev_put(dev); 708 return err; 709 } 710 711 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 712 struct netlink_callback *cb) 713 { 714 const struct nlmsghdr *nlh = cb->nlh; 715 struct net *net = sock_net(skb->sk); 716 int h, s_h; 717 int idx, s_idx; 718 struct net_device *dev; 719 struct inet6_dev *idev; 720 struct hlist_head *head; 721 722 if (cb->strict_check) { 723 struct netlink_ext_ack *extack = cb->extack; 724 struct netconfmsg *ncm; 725 726 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) { 727 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request"); 728 return -EINVAL; 729 } 730 731 if (nlmsg_attrlen(nlh, sizeof(*ncm))) { 732 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request"); 733 return -EINVAL; 734 } 735 } 736 737 s_h = cb->args[0]; 738 s_idx = idx = cb->args[1]; 739 740 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 741 idx = 0; 742 head = &net->dev_index_head[h]; 743 rcu_read_lock(); 744 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 745 net->dev_base_seq; 746 hlist_for_each_entry_rcu(dev, head, index_hlist) { 747 if (idx < s_idx) 748 goto cont; 749 idev = __in6_dev_get(dev); 750 if (!idev) 751 goto cont; 752 753 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 754 &idev->cnf, 755 NETLINK_CB(cb->skb).portid, 756 nlh->nlmsg_seq, 757 RTM_NEWNETCONF, 758 NLM_F_MULTI, 759 NETCONFA_ALL) < 0) { 760 rcu_read_unlock(); 761 goto done; 762 } 763 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 764 cont: 765 idx++; 766 } 767 rcu_read_unlock(); 768 } 769 if (h == NETDEV_HASHENTRIES) { 770 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 771 net->ipv6.devconf_all, 772 NETLINK_CB(cb->skb).portid, 773 nlh->nlmsg_seq, 774 RTM_NEWNETCONF, NLM_F_MULTI, 775 NETCONFA_ALL) < 0) 776 goto done; 777 else 778 h++; 779 } 780 if (h == NETDEV_HASHENTRIES + 1) { 781 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 782 net->ipv6.devconf_dflt, 783 NETLINK_CB(cb->skb).portid, 784 nlh->nlmsg_seq, 785 RTM_NEWNETCONF, NLM_F_MULTI, 786 NETCONFA_ALL) < 0) 787 goto done; 788 else 789 h++; 790 } 791 done: 792 cb->args[0] = h; 793 cb->args[1] = idx; 794 795 return skb->len; 796 } 797 798 #ifdef CONFIG_SYSCTL 799 static void dev_forward_change(struct inet6_dev *idev) 800 { 801 struct net_device *dev; 802 struct inet6_ifaddr *ifa; 803 804 if (!idev) 805 return; 806 dev = idev->dev; 807 if (idev->cnf.forwarding) 808 dev_disable_lro(dev); 809 if (dev->flags & IFF_MULTICAST) { 810 if (idev->cnf.forwarding) { 811 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 812 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 813 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 814 } else { 815 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 816 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 817 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 818 } 819 } 820 821 list_for_each_entry(ifa, &idev->addr_list, if_list) { 822 if (ifa->flags&IFA_F_TENTATIVE) 823 continue; 824 if (idev->cnf.forwarding) 825 addrconf_join_anycast(ifa); 826 else 827 addrconf_leave_anycast(ifa); 828 } 829 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, 830 NETCONFA_FORWARDING, 831 dev->ifindex, &idev->cnf); 832 } 833 834 835 static void addrconf_forward_change(struct net *net, __s32 newf) 836 { 837 struct net_device *dev; 838 struct inet6_dev *idev; 839 840 for_each_netdev(net, dev) { 841 idev = __in6_dev_get(dev); 842 if (idev) { 843 int changed = (!idev->cnf.forwarding) ^ (!newf); 844 idev->cnf.forwarding = newf; 845 if (changed) 846 dev_forward_change(idev); 847 } 848 } 849 } 850 851 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 852 { 853 struct net *net; 854 int old; 855 856 if (!rtnl_trylock()) 857 return restart_syscall(); 858 859 net = (struct net *)table->extra2; 860 old = *p; 861 *p = newf; 862 863 if (p == &net->ipv6.devconf_dflt->forwarding) { 864 if ((!newf) ^ (!old)) 865 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 866 NETCONFA_FORWARDING, 867 NETCONFA_IFINDEX_DEFAULT, 868 net->ipv6.devconf_dflt); 869 rtnl_unlock(); 870 return 0; 871 } 872 873 if (p == &net->ipv6.devconf_all->forwarding) { 874 int old_dflt = net->ipv6.devconf_dflt->forwarding; 875 876 net->ipv6.devconf_dflt->forwarding = newf; 877 if ((!newf) ^ (!old_dflt)) 878 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 879 NETCONFA_FORWARDING, 880 NETCONFA_IFINDEX_DEFAULT, 881 net->ipv6.devconf_dflt); 882 883 addrconf_forward_change(net, newf); 884 if ((!newf) ^ (!old)) 885 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 886 NETCONFA_FORWARDING, 887 NETCONFA_IFINDEX_ALL, 888 net->ipv6.devconf_all); 889 } else if ((!newf) ^ (!old)) 890 dev_forward_change((struct inet6_dev *)table->extra1); 891 rtnl_unlock(); 892 893 if (newf) 894 rt6_purge_dflt_routers(net); 895 return 1; 896 } 897 898 static void addrconf_linkdown_change(struct net *net, __s32 newf) 899 { 900 struct net_device *dev; 901 struct inet6_dev *idev; 902 903 for_each_netdev(net, dev) { 904 idev = __in6_dev_get(dev); 905 if (idev) { 906 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 907 908 idev->cnf.ignore_routes_with_linkdown = newf; 909 if (changed) 910 inet6_netconf_notify_devconf(dev_net(dev), 911 RTM_NEWNETCONF, 912 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 913 dev->ifindex, 914 &idev->cnf); 915 } 916 } 917 } 918 919 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 920 { 921 struct net *net; 922 int old; 923 924 if (!rtnl_trylock()) 925 return restart_syscall(); 926 927 net = (struct net *)table->extra2; 928 old = *p; 929 *p = newf; 930 931 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 932 if ((!newf) ^ (!old)) 933 inet6_netconf_notify_devconf(net, 934 RTM_NEWNETCONF, 935 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 936 NETCONFA_IFINDEX_DEFAULT, 937 net->ipv6.devconf_dflt); 938 rtnl_unlock(); 939 return 0; 940 } 941 942 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 943 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 944 addrconf_linkdown_change(net, newf); 945 if ((!newf) ^ (!old)) 946 inet6_netconf_notify_devconf(net, 947 RTM_NEWNETCONF, 948 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 949 NETCONFA_IFINDEX_ALL, 950 net->ipv6.devconf_all); 951 } 952 rtnl_unlock(); 953 954 return 1; 955 } 956 957 #endif 958 959 /* Nobody refers to this ifaddr, destroy it */ 960 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 961 { 962 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 963 964 #ifdef NET_REFCNT_DEBUG 965 pr_debug("%s\n", __func__); 966 #endif 967 968 in6_dev_put(ifp->idev); 969 970 if (cancel_delayed_work(&ifp->dad_work)) 971 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 972 ifp); 973 974 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 975 pr_warn("Freeing alive inet6 address %p\n", ifp); 976 return; 977 } 978 979 kfree_rcu(ifp, rcu); 980 } 981 982 static void 983 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 984 { 985 struct list_head *p; 986 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 987 988 /* 989 * Each device address list is sorted in order of scope - 990 * global before linklocal. 991 */ 992 list_for_each(p, &idev->addr_list) { 993 struct inet6_ifaddr *ifa 994 = list_entry(p, struct inet6_ifaddr, if_list); 995 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 996 break; 997 } 998 999 list_add_tail_rcu(&ifp->if_list, p); 1000 } 1001 1002 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr) 1003 { 1004 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net); 1005 1006 return hash_32(val, IN6_ADDR_HSIZE_SHIFT); 1007 } 1008 1009 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1010 struct net_device *dev, unsigned int hash) 1011 { 1012 struct inet6_ifaddr *ifp; 1013 1014 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1015 if (!net_eq(dev_net(ifp->idev->dev), net)) 1016 continue; 1017 if (ipv6_addr_equal(&ifp->addr, addr)) { 1018 if (!dev || ifp->idev->dev == dev) 1019 return true; 1020 } 1021 } 1022 return false; 1023 } 1024 1025 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa) 1026 { 1027 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr); 1028 int err = 0; 1029 1030 spin_lock(&addrconf_hash_lock); 1031 1032 /* Ignore adding duplicate addresses on an interface */ 1033 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) { 1034 netdev_dbg(dev, "ipv6_add_addr: already assigned\n"); 1035 err = -EEXIST; 1036 } else { 1037 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 1038 } 1039 1040 spin_unlock(&addrconf_hash_lock); 1041 1042 return err; 1043 } 1044 1045 /* On success it returns ifp with increased reference count */ 1046 1047 static struct inet6_ifaddr * 1048 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg, 1049 bool can_block, struct netlink_ext_ack *extack) 1050 { 1051 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC; 1052 int addr_type = ipv6_addr_type(cfg->pfx); 1053 struct net *net = dev_net(idev->dev); 1054 struct inet6_ifaddr *ifa = NULL; 1055 struct fib6_info *f6i = NULL; 1056 int err = 0; 1057 1058 if (addr_type == IPV6_ADDR_ANY || 1059 (addr_type & IPV6_ADDR_MULTICAST && 1060 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) || 1061 (!(idev->dev->flags & IFF_LOOPBACK) && 1062 !netif_is_l3_master(idev->dev) && 1063 addr_type & IPV6_ADDR_LOOPBACK)) 1064 return ERR_PTR(-EADDRNOTAVAIL); 1065 1066 if (idev->dead) { 1067 err = -ENODEV; /*XXX*/ 1068 goto out; 1069 } 1070 1071 if (idev->cnf.disable_ipv6) { 1072 err = -EACCES; 1073 goto out; 1074 } 1075 1076 /* validator notifier needs to be blocking; 1077 * do not call in atomic context 1078 */ 1079 if (can_block) { 1080 struct in6_validator_info i6vi = { 1081 .i6vi_addr = *cfg->pfx, 1082 .i6vi_dev = idev, 1083 .extack = extack, 1084 }; 1085 1086 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi); 1087 err = notifier_to_errno(err); 1088 if (err < 0) 1089 goto out; 1090 } 1091 1092 ifa = kzalloc(sizeof(*ifa), gfp_flags | __GFP_ACCOUNT); 1093 if (!ifa) { 1094 err = -ENOBUFS; 1095 goto out; 1096 } 1097 1098 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags); 1099 if (IS_ERR(f6i)) { 1100 err = PTR_ERR(f6i); 1101 f6i = NULL; 1102 goto out; 1103 } 1104 1105 if (net->ipv6.devconf_all->disable_policy || 1106 idev->cnf.disable_policy) 1107 f6i->dst_nopolicy = true; 1108 1109 neigh_parms_data_state_setall(idev->nd_parms); 1110 1111 ifa->addr = *cfg->pfx; 1112 if (cfg->peer_pfx) 1113 ifa->peer_addr = *cfg->peer_pfx; 1114 1115 spin_lock_init(&ifa->lock); 1116 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1117 INIT_HLIST_NODE(&ifa->addr_lst); 1118 ifa->scope = cfg->scope; 1119 ifa->prefix_len = cfg->plen; 1120 ifa->rt_priority = cfg->rt_priority; 1121 ifa->flags = cfg->ifa_flags; 1122 /* No need to add the TENTATIVE flag for addresses with NODAD */ 1123 if (!(cfg->ifa_flags & IFA_F_NODAD)) 1124 ifa->flags |= IFA_F_TENTATIVE; 1125 ifa->valid_lft = cfg->valid_lft; 1126 ifa->prefered_lft = cfg->preferred_lft; 1127 ifa->cstamp = ifa->tstamp = jiffies; 1128 ifa->tokenized = false; 1129 1130 ifa->rt = f6i; 1131 1132 ifa->idev = idev; 1133 in6_dev_hold(idev); 1134 1135 /* For caller */ 1136 refcount_set(&ifa->refcnt, 1); 1137 1138 rcu_read_lock_bh(); 1139 1140 err = ipv6_add_addr_hash(idev->dev, ifa); 1141 if (err < 0) { 1142 rcu_read_unlock_bh(); 1143 goto out; 1144 } 1145 1146 write_lock(&idev->lock); 1147 1148 /* Add to inet6_dev unicast addr list. */ 1149 ipv6_link_dev_addr(idev, ifa); 1150 1151 if (ifa->flags&IFA_F_TEMPORARY) { 1152 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1153 in6_ifa_hold(ifa); 1154 } 1155 1156 in6_ifa_hold(ifa); 1157 write_unlock(&idev->lock); 1158 1159 rcu_read_unlock_bh(); 1160 1161 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1162 out: 1163 if (unlikely(err < 0)) { 1164 fib6_info_release(f6i); 1165 1166 if (ifa) { 1167 if (ifa->idev) 1168 in6_dev_put(ifa->idev); 1169 kfree(ifa); 1170 } 1171 ifa = ERR_PTR(err); 1172 } 1173 1174 return ifa; 1175 } 1176 1177 enum cleanup_prefix_rt_t { 1178 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1179 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1180 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1181 }; 1182 1183 /* 1184 * Check, whether the prefix for ifp would still need a prefix route 1185 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1186 * constants. 1187 * 1188 * 1) we don't purge prefix if address was not permanent. 1189 * prefix is managed by its own lifetime. 1190 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1191 * 3) if there are no addresses, delete prefix. 1192 * 4) if there are still other permanent address(es), 1193 * corresponding prefix is still permanent. 1194 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1195 * don't purge the prefix, assume user space is managing it. 1196 * 6) otherwise, update prefix lifetime to the 1197 * longest valid lifetime among the corresponding 1198 * addresses on the device. 1199 * Note: subsequent RA will update lifetime. 1200 **/ 1201 static enum cleanup_prefix_rt_t 1202 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1203 { 1204 struct inet6_ifaddr *ifa; 1205 struct inet6_dev *idev = ifp->idev; 1206 unsigned long lifetime; 1207 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1208 1209 *expires = jiffies; 1210 1211 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1212 if (ifa == ifp) 1213 continue; 1214 if (ifa->prefix_len != ifp->prefix_len || 1215 !ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1216 ifp->prefix_len)) 1217 continue; 1218 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1219 return CLEANUP_PREFIX_RT_NOP; 1220 1221 action = CLEANUP_PREFIX_RT_EXPIRE; 1222 1223 spin_lock(&ifa->lock); 1224 1225 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1226 /* 1227 * Note: Because this address is 1228 * not permanent, lifetime < 1229 * LONG_MAX / HZ here. 1230 */ 1231 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1232 *expires = ifa->tstamp + lifetime * HZ; 1233 spin_unlock(&ifa->lock); 1234 } 1235 1236 return action; 1237 } 1238 1239 static void 1240 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, 1241 bool del_rt, bool del_peer) 1242 { 1243 struct fib6_info *f6i; 1244 1245 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr, 1246 ifp->prefix_len, 1247 ifp->idev->dev, 0, RTF_DEFAULT, true); 1248 if (f6i) { 1249 if (del_rt) 1250 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 1251 else { 1252 if (!(f6i->fib6_flags & RTF_EXPIRES)) 1253 fib6_set_expires(f6i, expires); 1254 fib6_info_release(f6i); 1255 } 1256 } 1257 } 1258 1259 1260 /* This function wants to get referenced ifp and releases it before return */ 1261 1262 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1263 { 1264 int state; 1265 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1266 unsigned long expires; 1267 1268 ASSERT_RTNL(); 1269 1270 spin_lock_bh(&ifp->lock); 1271 state = ifp->state; 1272 ifp->state = INET6_IFADDR_STATE_DEAD; 1273 spin_unlock_bh(&ifp->lock); 1274 1275 if (state == INET6_IFADDR_STATE_DEAD) 1276 goto out; 1277 1278 spin_lock_bh(&addrconf_hash_lock); 1279 hlist_del_init_rcu(&ifp->addr_lst); 1280 spin_unlock_bh(&addrconf_hash_lock); 1281 1282 write_lock_bh(&ifp->idev->lock); 1283 1284 if (ifp->flags&IFA_F_TEMPORARY) { 1285 list_del(&ifp->tmp_list); 1286 if (ifp->ifpub) { 1287 in6_ifa_put(ifp->ifpub); 1288 ifp->ifpub = NULL; 1289 } 1290 __in6_ifa_put(ifp); 1291 } 1292 1293 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1294 action = check_cleanup_prefix_route(ifp, &expires); 1295 1296 list_del_rcu(&ifp->if_list); 1297 __in6_ifa_put(ifp); 1298 1299 write_unlock_bh(&ifp->idev->lock); 1300 1301 addrconf_del_dad_work(ifp); 1302 1303 ipv6_ifa_notify(RTM_DELADDR, ifp); 1304 1305 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1306 1307 if (action != CLEANUP_PREFIX_RT_NOP) { 1308 cleanup_prefix_route(ifp, expires, 1309 action == CLEANUP_PREFIX_RT_DEL, false); 1310 } 1311 1312 /* clean up prefsrc entries */ 1313 rt6_remove_prefsrc(ifp); 1314 out: 1315 in6_ifa_put(ifp); 1316 } 1317 1318 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block) 1319 { 1320 struct inet6_dev *idev = ifp->idev; 1321 unsigned long tmp_tstamp, age; 1322 unsigned long regen_advance; 1323 unsigned long now = jiffies; 1324 s32 cnf_temp_preferred_lft; 1325 struct inet6_ifaddr *ift; 1326 struct ifa6_config cfg; 1327 long max_desync_factor; 1328 struct in6_addr addr; 1329 int ret = 0; 1330 1331 write_lock_bh(&idev->lock); 1332 1333 retry: 1334 in6_dev_hold(idev); 1335 if (idev->cnf.use_tempaddr <= 0) { 1336 write_unlock_bh(&idev->lock); 1337 pr_info("%s: use_tempaddr is disabled\n", __func__); 1338 in6_dev_put(idev); 1339 ret = -1; 1340 goto out; 1341 } 1342 spin_lock_bh(&ifp->lock); 1343 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1344 idev->cnf.use_tempaddr = -1; /*XXX*/ 1345 spin_unlock_bh(&ifp->lock); 1346 write_unlock_bh(&idev->lock); 1347 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1348 __func__); 1349 in6_dev_put(idev); 1350 ret = -1; 1351 goto out; 1352 } 1353 in6_ifa_hold(ifp); 1354 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1355 ipv6_gen_rnd_iid(&addr); 1356 1357 age = (now - ifp->tstamp) / HZ; 1358 1359 regen_advance = idev->cnf.regen_max_retry * 1360 idev->cnf.dad_transmits * 1361 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 1362 1363 /* recalculate max_desync_factor each time and update 1364 * idev->desync_factor if it's larger 1365 */ 1366 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1367 max_desync_factor = min_t(__u32, 1368 idev->cnf.max_desync_factor, 1369 cnf_temp_preferred_lft - regen_advance); 1370 1371 if (unlikely(idev->desync_factor > max_desync_factor)) { 1372 if (max_desync_factor > 0) { 1373 get_random_bytes(&idev->desync_factor, 1374 sizeof(idev->desync_factor)); 1375 idev->desync_factor %= max_desync_factor; 1376 } else { 1377 idev->desync_factor = 0; 1378 } 1379 } 1380 1381 memset(&cfg, 0, sizeof(cfg)); 1382 cfg.valid_lft = min_t(__u32, ifp->valid_lft, 1383 idev->cnf.temp_valid_lft + age); 1384 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor; 1385 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft); 1386 1387 cfg.plen = ifp->prefix_len; 1388 tmp_tstamp = ifp->tstamp; 1389 spin_unlock_bh(&ifp->lock); 1390 1391 write_unlock_bh(&idev->lock); 1392 1393 /* A temporary address is created only if this calculated Preferred 1394 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1395 * an implementation must not create a temporary address with a zero 1396 * Preferred Lifetime. 1397 * Use age calculation as in addrconf_verify to avoid unnecessary 1398 * temporary addresses being generated. 1399 */ 1400 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1401 if (cfg.preferred_lft <= regen_advance + age) { 1402 in6_ifa_put(ifp); 1403 in6_dev_put(idev); 1404 ret = -1; 1405 goto out; 1406 } 1407 1408 cfg.ifa_flags = IFA_F_TEMPORARY; 1409 /* set in addrconf_prefix_rcv() */ 1410 if (ifp->flags & IFA_F_OPTIMISTIC) 1411 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 1412 1413 cfg.pfx = &addr; 1414 cfg.scope = ipv6_addr_scope(cfg.pfx); 1415 1416 ift = ipv6_add_addr(idev, &cfg, block, NULL); 1417 if (IS_ERR(ift)) { 1418 in6_ifa_put(ifp); 1419 in6_dev_put(idev); 1420 pr_info("%s: retry temporary address regeneration\n", __func__); 1421 write_lock_bh(&idev->lock); 1422 goto retry; 1423 } 1424 1425 spin_lock_bh(&ift->lock); 1426 ift->ifpub = ifp; 1427 ift->cstamp = now; 1428 ift->tstamp = tmp_tstamp; 1429 spin_unlock_bh(&ift->lock); 1430 1431 addrconf_dad_start(ift); 1432 in6_ifa_put(ift); 1433 in6_dev_put(idev); 1434 out: 1435 return ret; 1436 } 1437 1438 /* 1439 * Choose an appropriate source address (RFC3484) 1440 */ 1441 enum { 1442 IPV6_SADDR_RULE_INIT = 0, 1443 IPV6_SADDR_RULE_LOCAL, 1444 IPV6_SADDR_RULE_SCOPE, 1445 IPV6_SADDR_RULE_PREFERRED, 1446 #ifdef CONFIG_IPV6_MIP6 1447 IPV6_SADDR_RULE_HOA, 1448 #endif 1449 IPV6_SADDR_RULE_OIF, 1450 IPV6_SADDR_RULE_LABEL, 1451 IPV6_SADDR_RULE_PRIVACY, 1452 IPV6_SADDR_RULE_ORCHID, 1453 IPV6_SADDR_RULE_PREFIX, 1454 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1455 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1456 #endif 1457 IPV6_SADDR_RULE_MAX 1458 }; 1459 1460 struct ipv6_saddr_score { 1461 int rule; 1462 int addr_type; 1463 struct inet6_ifaddr *ifa; 1464 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1465 int scopedist; 1466 int matchlen; 1467 }; 1468 1469 struct ipv6_saddr_dst { 1470 const struct in6_addr *addr; 1471 int ifindex; 1472 int scope; 1473 int label; 1474 unsigned int prefs; 1475 }; 1476 1477 static inline int ipv6_saddr_preferred(int type) 1478 { 1479 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1480 return 1; 1481 return 0; 1482 } 1483 1484 static bool ipv6_use_optimistic_addr(struct net *net, 1485 struct inet6_dev *idev) 1486 { 1487 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1488 if (!idev) 1489 return false; 1490 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1491 return false; 1492 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic) 1493 return false; 1494 1495 return true; 1496 #else 1497 return false; 1498 #endif 1499 } 1500 1501 static bool ipv6_allow_optimistic_dad(struct net *net, 1502 struct inet6_dev *idev) 1503 { 1504 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1505 if (!idev) 1506 return false; 1507 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1508 return false; 1509 1510 return true; 1511 #else 1512 return false; 1513 #endif 1514 } 1515 1516 static int ipv6_get_saddr_eval(struct net *net, 1517 struct ipv6_saddr_score *score, 1518 struct ipv6_saddr_dst *dst, 1519 int i) 1520 { 1521 int ret; 1522 1523 if (i <= score->rule) { 1524 switch (i) { 1525 case IPV6_SADDR_RULE_SCOPE: 1526 ret = score->scopedist; 1527 break; 1528 case IPV6_SADDR_RULE_PREFIX: 1529 ret = score->matchlen; 1530 break; 1531 default: 1532 ret = !!test_bit(i, score->scorebits); 1533 } 1534 goto out; 1535 } 1536 1537 switch (i) { 1538 case IPV6_SADDR_RULE_INIT: 1539 /* Rule 0: remember if hiscore is not ready yet */ 1540 ret = !!score->ifa; 1541 break; 1542 case IPV6_SADDR_RULE_LOCAL: 1543 /* Rule 1: Prefer same address */ 1544 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1545 break; 1546 case IPV6_SADDR_RULE_SCOPE: 1547 /* Rule 2: Prefer appropriate scope 1548 * 1549 * ret 1550 * ^ 1551 * -1 | d 15 1552 * ---+--+-+---> scope 1553 * | 1554 * | d is scope of the destination. 1555 * B-d | \ 1556 * | \ <- smaller scope is better if 1557 * B-15 | \ if scope is enough for destination. 1558 * | ret = B - scope (-1 <= scope >= d <= 15). 1559 * d-C-1 | / 1560 * |/ <- greater is better 1561 * -C / if scope is not enough for destination. 1562 * /| ret = scope - C (-1 <= d < scope <= 15). 1563 * 1564 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1565 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1566 * Assume B = 0 and we get C > 29. 1567 */ 1568 ret = __ipv6_addr_src_scope(score->addr_type); 1569 if (ret >= dst->scope) 1570 ret = -ret; 1571 else 1572 ret -= 128; /* 30 is enough */ 1573 score->scopedist = ret; 1574 break; 1575 case IPV6_SADDR_RULE_PREFERRED: 1576 { 1577 /* Rule 3: Avoid deprecated and optimistic addresses */ 1578 u8 avoid = IFA_F_DEPRECATED; 1579 1580 if (!ipv6_use_optimistic_addr(net, score->ifa->idev)) 1581 avoid |= IFA_F_OPTIMISTIC; 1582 ret = ipv6_saddr_preferred(score->addr_type) || 1583 !(score->ifa->flags & avoid); 1584 break; 1585 } 1586 #ifdef CONFIG_IPV6_MIP6 1587 case IPV6_SADDR_RULE_HOA: 1588 { 1589 /* Rule 4: Prefer home address */ 1590 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1591 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1592 break; 1593 } 1594 #endif 1595 case IPV6_SADDR_RULE_OIF: 1596 /* Rule 5: Prefer outgoing interface */ 1597 ret = (!dst->ifindex || 1598 dst->ifindex == score->ifa->idev->dev->ifindex); 1599 break; 1600 case IPV6_SADDR_RULE_LABEL: 1601 /* Rule 6: Prefer matching label */ 1602 ret = ipv6_addr_label(net, 1603 &score->ifa->addr, score->addr_type, 1604 score->ifa->idev->dev->ifindex) == dst->label; 1605 break; 1606 case IPV6_SADDR_RULE_PRIVACY: 1607 { 1608 /* Rule 7: Prefer public address 1609 * Note: prefer temporary address if use_tempaddr >= 2 1610 */ 1611 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1612 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1613 score->ifa->idev->cnf.use_tempaddr >= 2; 1614 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1615 break; 1616 } 1617 case IPV6_SADDR_RULE_ORCHID: 1618 /* Rule 8-: Prefer ORCHID vs ORCHID or 1619 * non-ORCHID vs non-ORCHID 1620 */ 1621 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1622 ipv6_addr_orchid(dst->addr)); 1623 break; 1624 case IPV6_SADDR_RULE_PREFIX: 1625 /* Rule 8: Use longest matching prefix */ 1626 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1627 if (ret > score->ifa->prefix_len) 1628 ret = score->ifa->prefix_len; 1629 score->matchlen = ret; 1630 break; 1631 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1632 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1633 /* Optimistic addresses still have lower precedence than other 1634 * preferred addresses. 1635 */ 1636 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1637 break; 1638 #endif 1639 default: 1640 ret = 0; 1641 } 1642 1643 if (ret) 1644 __set_bit(i, score->scorebits); 1645 score->rule = i; 1646 out: 1647 return ret; 1648 } 1649 1650 static int __ipv6_dev_get_saddr(struct net *net, 1651 struct ipv6_saddr_dst *dst, 1652 struct inet6_dev *idev, 1653 struct ipv6_saddr_score *scores, 1654 int hiscore_idx) 1655 { 1656 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1657 1658 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) { 1659 int i; 1660 1661 /* 1662 * - Tentative Address (RFC2462 section 5.4) 1663 * - A tentative address is not considered 1664 * "assigned to an interface" in the traditional 1665 * sense, unless it is also flagged as optimistic. 1666 * - Candidate Source Address (section 4) 1667 * - In any case, anycast addresses, multicast 1668 * addresses, and the unspecified address MUST 1669 * NOT be included in a candidate set. 1670 */ 1671 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1672 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1673 continue; 1674 1675 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1676 1677 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1678 score->addr_type & IPV6_ADDR_MULTICAST)) { 1679 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1680 idev->dev->name); 1681 continue; 1682 } 1683 1684 score->rule = -1; 1685 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1686 1687 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1688 int minihiscore, miniscore; 1689 1690 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1691 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1692 1693 if (minihiscore > miniscore) { 1694 if (i == IPV6_SADDR_RULE_SCOPE && 1695 score->scopedist > 0) { 1696 /* 1697 * special case: 1698 * each remaining entry 1699 * has too small (not enough) 1700 * scope, because ifa entries 1701 * are sorted by their scope 1702 * values. 1703 */ 1704 goto out; 1705 } 1706 break; 1707 } else if (minihiscore < miniscore) { 1708 swap(hiscore, score); 1709 hiscore_idx = 1 - hiscore_idx; 1710 1711 /* restore our iterator */ 1712 score->ifa = hiscore->ifa; 1713 1714 break; 1715 } 1716 } 1717 } 1718 out: 1719 return hiscore_idx; 1720 } 1721 1722 static int ipv6_get_saddr_master(struct net *net, 1723 const struct net_device *dst_dev, 1724 const struct net_device *master, 1725 struct ipv6_saddr_dst *dst, 1726 struct ipv6_saddr_score *scores, 1727 int hiscore_idx) 1728 { 1729 struct inet6_dev *idev; 1730 1731 idev = __in6_dev_get(dst_dev); 1732 if (idev) 1733 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1734 scores, hiscore_idx); 1735 1736 idev = __in6_dev_get(master); 1737 if (idev) 1738 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1739 scores, hiscore_idx); 1740 1741 return hiscore_idx; 1742 } 1743 1744 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1745 const struct in6_addr *daddr, unsigned int prefs, 1746 struct in6_addr *saddr) 1747 { 1748 struct ipv6_saddr_score scores[2], *hiscore; 1749 struct ipv6_saddr_dst dst; 1750 struct inet6_dev *idev; 1751 struct net_device *dev; 1752 int dst_type; 1753 bool use_oif_addr = false; 1754 int hiscore_idx = 0; 1755 int ret = 0; 1756 1757 dst_type = __ipv6_addr_type(daddr); 1758 dst.addr = daddr; 1759 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1760 dst.scope = __ipv6_addr_src_scope(dst_type); 1761 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1762 dst.prefs = prefs; 1763 1764 scores[hiscore_idx].rule = -1; 1765 scores[hiscore_idx].ifa = NULL; 1766 1767 rcu_read_lock(); 1768 1769 /* Candidate Source Address (section 4) 1770 * - multicast and link-local destination address, 1771 * the set of candidate source address MUST only 1772 * include addresses assigned to interfaces 1773 * belonging to the same link as the outgoing 1774 * interface. 1775 * (- For site-local destination addresses, the 1776 * set of candidate source addresses MUST only 1777 * include addresses assigned to interfaces 1778 * belonging to the same site as the outgoing 1779 * interface.) 1780 * - "It is RECOMMENDED that the candidate source addresses 1781 * be the set of unicast addresses assigned to the 1782 * interface that will be used to send to the destination 1783 * (the 'outgoing' interface)." (RFC 6724) 1784 */ 1785 if (dst_dev) { 1786 idev = __in6_dev_get(dst_dev); 1787 if ((dst_type & IPV6_ADDR_MULTICAST) || 1788 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1789 (idev && idev->cnf.use_oif_addrs_only)) { 1790 use_oif_addr = true; 1791 } 1792 } 1793 1794 if (use_oif_addr) { 1795 if (idev) 1796 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1797 } else { 1798 const struct net_device *master; 1799 int master_idx = 0; 1800 1801 /* if dst_dev exists and is enslaved to an L3 device, then 1802 * prefer addresses from dst_dev and then the master over 1803 * any other enslaved devices in the L3 domain. 1804 */ 1805 master = l3mdev_master_dev_rcu(dst_dev); 1806 if (master) { 1807 master_idx = master->ifindex; 1808 1809 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1810 master, &dst, 1811 scores, hiscore_idx); 1812 1813 if (scores[hiscore_idx].ifa) 1814 goto out; 1815 } 1816 1817 for_each_netdev_rcu(net, dev) { 1818 /* only consider addresses on devices in the 1819 * same L3 domain 1820 */ 1821 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1822 continue; 1823 idev = __in6_dev_get(dev); 1824 if (!idev) 1825 continue; 1826 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1827 } 1828 } 1829 1830 out: 1831 hiscore = &scores[hiscore_idx]; 1832 if (!hiscore->ifa) 1833 ret = -EADDRNOTAVAIL; 1834 else 1835 *saddr = hiscore->ifa->addr; 1836 1837 rcu_read_unlock(); 1838 return ret; 1839 } 1840 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1841 1842 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1843 u32 banned_flags) 1844 { 1845 struct inet6_ifaddr *ifp; 1846 int err = -EADDRNOTAVAIL; 1847 1848 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1849 if (ifp->scope > IFA_LINK) 1850 break; 1851 if (ifp->scope == IFA_LINK && 1852 !(ifp->flags & banned_flags)) { 1853 *addr = ifp->addr; 1854 err = 0; 1855 break; 1856 } 1857 } 1858 return err; 1859 } 1860 1861 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1862 u32 banned_flags) 1863 { 1864 struct inet6_dev *idev; 1865 int err = -EADDRNOTAVAIL; 1866 1867 rcu_read_lock(); 1868 idev = __in6_dev_get(dev); 1869 if (idev) { 1870 read_lock_bh(&idev->lock); 1871 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1872 read_unlock_bh(&idev->lock); 1873 } 1874 rcu_read_unlock(); 1875 return err; 1876 } 1877 1878 static int ipv6_count_addresses(const struct inet6_dev *idev) 1879 { 1880 const struct inet6_ifaddr *ifp; 1881 int cnt = 0; 1882 1883 rcu_read_lock(); 1884 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list) 1885 cnt++; 1886 rcu_read_unlock(); 1887 return cnt; 1888 } 1889 1890 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1891 const struct net_device *dev, int strict) 1892 { 1893 return ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1894 strict, IFA_F_TENTATIVE); 1895 } 1896 EXPORT_SYMBOL(ipv6_chk_addr); 1897 1898 /* device argument is used to find the L3 domain of interest. If 1899 * skip_dev_check is set, then the ifp device is not checked against 1900 * the passed in dev argument. So the 2 cases for addresses checks are: 1901 * 1. does the address exist in the L3 domain that dev is part of 1902 * (skip_dev_check = true), or 1903 * 1904 * 2. does the address exist on the specific device 1905 * (skip_dev_check = false) 1906 */ 1907 static struct net_device * 1908 __ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1909 const struct net_device *dev, bool skip_dev_check, 1910 int strict, u32 banned_flags) 1911 { 1912 unsigned int hash = inet6_addr_hash(net, addr); 1913 struct net_device *l3mdev, *ndev; 1914 struct inet6_ifaddr *ifp; 1915 u32 ifp_flags; 1916 1917 rcu_read_lock(); 1918 1919 l3mdev = l3mdev_master_dev_rcu(dev); 1920 if (skip_dev_check) 1921 dev = NULL; 1922 1923 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1924 ndev = ifp->idev->dev; 1925 if (!net_eq(dev_net(ndev), net)) 1926 continue; 1927 1928 if (l3mdev_master_dev_rcu(ndev) != l3mdev) 1929 continue; 1930 1931 /* Decouple optimistic from tentative for evaluation here. 1932 * Ban optimistic addresses explicitly, when required. 1933 */ 1934 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1935 ? (ifp->flags&~IFA_F_TENTATIVE) 1936 : ifp->flags; 1937 if (ipv6_addr_equal(&ifp->addr, addr) && 1938 !(ifp_flags&banned_flags) && 1939 (!dev || ndev == dev || 1940 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1941 rcu_read_unlock(); 1942 return ndev; 1943 } 1944 } 1945 1946 rcu_read_unlock(); 1947 return NULL; 1948 } 1949 1950 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1951 const struct net_device *dev, bool skip_dev_check, 1952 int strict, u32 banned_flags) 1953 { 1954 return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check, 1955 strict, banned_flags) ? 1 : 0; 1956 } 1957 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1958 1959 1960 /* Compares an address/prefix_len with addresses on device @dev. 1961 * If one is found it returns true. 1962 */ 1963 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1964 const unsigned int prefix_len, struct net_device *dev) 1965 { 1966 const struct inet6_ifaddr *ifa; 1967 const struct inet6_dev *idev; 1968 bool ret = false; 1969 1970 rcu_read_lock(); 1971 idev = __in6_dev_get(dev); 1972 if (idev) { 1973 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1974 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1975 if (ret) 1976 break; 1977 } 1978 } 1979 rcu_read_unlock(); 1980 1981 return ret; 1982 } 1983 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1984 1985 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1986 { 1987 const struct inet6_ifaddr *ifa; 1988 const struct inet6_dev *idev; 1989 int onlink; 1990 1991 onlink = 0; 1992 rcu_read_lock(); 1993 idev = __in6_dev_get(dev); 1994 if (idev) { 1995 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1996 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1997 ifa->prefix_len); 1998 if (onlink) 1999 break; 2000 } 2001 } 2002 rcu_read_unlock(); 2003 return onlink; 2004 } 2005 EXPORT_SYMBOL(ipv6_chk_prefix); 2006 2007 /** 2008 * ipv6_dev_find - find the first device with a given source address. 2009 * @net: the net namespace 2010 * @addr: the source address 2011 * @dev: used to find the L3 domain of interest 2012 * 2013 * The caller should be protected by RCU, or RTNL. 2014 */ 2015 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr, 2016 struct net_device *dev) 2017 { 2018 return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1, 2019 IFA_F_TENTATIVE); 2020 } 2021 EXPORT_SYMBOL(ipv6_dev_find); 2022 2023 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 2024 struct net_device *dev, int strict) 2025 { 2026 unsigned int hash = inet6_addr_hash(net, addr); 2027 struct inet6_ifaddr *ifp, *result = NULL; 2028 2029 rcu_read_lock(); 2030 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 2031 if (!net_eq(dev_net(ifp->idev->dev), net)) 2032 continue; 2033 if (ipv6_addr_equal(&ifp->addr, addr)) { 2034 if (!dev || ifp->idev->dev == dev || 2035 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 2036 result = ifp; 2037 in6_ifa_hold(ifp); 2038 break; 2039 } 2040 } 2041 } 2042 rcu_read_unlock(); 2043 2044 return result; 2045 } 2046 2047 /* Gets referenced address, destroys ifaddr */ 2048 2049 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 2050 { 2051 if (dad_failed) 2052 ifp->flags |= IFA_F_DADFAILED; 2053 2054 if (ifp->flags&IFA_F_TEMPORARY) { 2055 struct inet6_ifaddr *ifpub; 2056 spin_lock_bh(&ifp->lock); 2057 ifpub = ifp->ifpub; 2058 if (ifpub) { 2059 in6_ifa_hold(ifpub); 2060 spin_unlock_bh(&ifp->lock); 2061 ipv6_create_tempaddr(ifpub, true); 2062 in6_ifa_put(ifpub); 2063 } else { 2064 spin_unlock_bh(&ifp->lock); 2065 } 2066 ipv6_del_addr(ifp); 2067 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) { 2068 spin_lock_bh(&ifp->lock); 2069 addrconf_del_dad_work(ifp); 2070 ifp->flags |= IFA_F_TENTATIVE; 2071 if (dad_failed) 2072 ifp->flags &= ~IFA_F_OPTIMISTIC; 2073 spin_unlock_bh(&ifp->lock); 2074 if (dad_failed) 2075 ipv6_ifa_notify(0, ifp); 2076 in6_ifa_put(ifp); 2077 } else { 2078 ipv6_del_addr(ifp); 2079 } 2080 } 2081 2082 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 2083 { 2084 int err = -ENOENT; 2085 2086 spin_lock_bh(&ifp->lock); 2087 if (ifp->state == INET6_IFADDR_STATE_DAD) { 2088 ifp->state = INET6_IFADDR_STATE_POSTDAD; 2089 err = 0; 2090 } 2091 spin_unlock_bh(&ifp->lock); 2092 2093 return err; 2094 } 2095 2096 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp) 2097 { 2098 struct inet6_dev *idev = ifp->idev; 2099 struct net *net = dev_net(ifp->idev->dev); 2100 2101 if (addrconf_dad_end(ifp)) { 2102 in6_ifa_put(ifp); 2103 return; 2104 } 2105 2106 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n", 2107 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source); 2108 2109 spin_lock_bh(&ifp->lock); 2110 2111 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 2112 struct in6_addr new_addr; 2113 struct inet6_ifaddr *ifp2; 2114 int retries = ifp->stable_privacy_retry + 1; 2115 struct ifa6_config cfg = { 2116 .pfx = &new_addr, 2117 .plen = ifp->prefix_len, 2118 .ifa_flags = ifp->flags, 2119 .valid_lft = ifp->valid_lft, 2120 .preferred_lft = ifp->prefered_lft, 2121 .scope = ifp->scope, 2122 }; 2123 2124 if (retries > net->ipv6.sysctl.idgen_retries) { 2125 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 2126 ifp->idev->dev->name); 2127 goto errdad; 2128 } 2129 2130 new_addr = ifp->addr; 2131 if (ipv6_generate_stable_address(&new_addr, retries, 2132 idev)) 2133 goto errdad; 2134 2135 spin_unlock_bh(&ifp->lock); 2136 2137 if (idev->cnf.max_addresses && 2138 ipv6_count_addresses(idev) >= 2139 idev->cnf.max_addresses) 2140 goto lock_errdad; 2141 2142 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 2143 ifp->idev->dev->name); 2144 2145 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL); 2146 if (IS_ERR(ifp2)) 2147 goto lock_errdad; 2148 2149 spin_lock_bh(&ifp2->lock); 2150 ifp2->stable_privacy_retry = retries; 2151 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2152 spin_unlock_bh(&ifp2->lock); 2153 2154 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2155 in6_ifa_put(ifp2); 2156 lock_errdad: 2157 spin_lock_bh(&ifp->lock); 2158 } 2159 2160 errdad: 2161 /* transition from _POSTDAD to _ERRDAD */ 2162 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2163 spin_unlock_bh(&ifp->lock); 2164 2165 addrconf_mod_dad_work(ifp, 0); 2166 in6_ifa_put(ifp); 2167 } 2168 2169 /* Join to solicited addr multicast group. 2170 * caller must hold RTNL */ 2171 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2172 { 2173 struct in6_addr maddr; 2174 2175 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2176 return; 2177 2178 addrconf_addr_solict_mult(addr, &maddr); 2179 ipv6_dev_mc_inc(dev, &maddr); 2180 } 2181 2182 /* caller must hold RTNL */ 2183 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2184 { 2185 struct in6_addr maddr; 2186 2187 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2188 return; 2189 2190 addrconf_addr_solict_mult(addr, &maddr); 2191 __ipv6_dev_mc_dec(idev, &maddr); 2192 } 2193 2194 /* caller must hold RTNL */ 2195 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2196 { 2197 struct in6_addr addr; 2198 2199 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2200 return; 2201 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2202 if (ipv6_addr_any(&addr)) 2203 return; 2204 __ipv6_dev_ac_inc(ifp->idev, &addr); 2205 } 2206 2207 /* caller must hold RTNL */ 2208 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2209 { 2210 struct in6_addr addr; 2211 2212 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2213 return; 2214 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2215 if (ipv6_addr_any(&addr)) 2216 return; 2217 __ipv6_dev_ac_dec(ifp->idev, &addr); 2218 } 2219 2220 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2221 { 2222 switch (dev->addr_len) { 2223 case ETH_ALEN: 2224 memcpy(eui, dev->dev_addr, 3); 2225 eui[3] = 0xFF; 2226 eui[4] = 0xFE; 2227 memcpy(eui + 5, dev->dev_addr + 3, 3); 2228 break; 2229 case EUI64_ADDR_LEN: 2230 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2231 eui[0] ^= 2; 2232 break; 2233 default: 2234 return -1; 2235 } 2236 2237 return 0; 2238 } 2239 2240 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2241 { 2242 const union fwnet_hwaddr *ha; 2243 2244 if (dev->addr_len != FWNET_ALEN) 2245 return -1; 2246 2247 ha = (const union fwnet_hwaddr *)dev->dev_addr; 2248 2249 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2250 eui[0] ^= 2; 2251 return 0; 2252 } 2253 2254 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2255 { 2256 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2257 if (dev->addr_len != ARCNET_ALEN) 2258 return -1; 2259 memset(eui, 0, 7); 2260 eui[7] = *(u8 *)dev->dev_addr; 2261 return 0; 2262 } 2263 2264 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2265 { 2266 if (dev->addr_len != INFINIBAND_ALEN) 2267 return -1; 2268 memcpy(eui, dev->dev_addr + 12, 8); 2269 eui[0] |= 2; 2270 return 0; 2271 } 2272 2273 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2274 { 2275 if (addr == 0) 2276 return -1; 2277 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2278 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2279 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2280 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2281 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2282 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2283 eui[1] = 0; 2284 eui[2] = 0x5E; 2285 eui[3] = 0xFE; 2286 memcpy(eui + 4, &addr, 4); 2287 return 0; 2288 } 2289 2290 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2291 { 2292 if (dev->priv_flags & IFF_ISATAP) 2293 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2294 return -1; 2295 } 2296 2297 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2298 { 2299 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2300 } 2301 2302 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2303 { 2304 memcpy(eui, dev->perm_addr, 3); 2305 memcpy(eui + 5, dev->perm_addr + 3, 3); 2306 eui[3] = 0xFF; 2307 eui[4] = 0xFE; 2308 eui[0] ^= 2; 2309 return 0; 2310 } 2311 2312 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2313 { 2314 switch (dev->type) { 2315 case ARPHRD_ETHER: 2316 case ARPHRD_FDDI: 2317 return addrconf_ifid_eui48(eui, dev); 2318 case ARPHRD_ARCNET: 2319 return addrconf_ifid_arcnet(eui, dev); 2320 case ARPHRD_INFINIBAND: 2321 return addrconf_ifid_infiniband(eui, dev); 2322 case ARPHRD_SIT: 2323 return addrconf_ifid_sit(eui, dev); 2324 case ARPHRD_IPGRE: 2325 case ARPHRD_TUNNEL: 2326 return addrconf_ifid_gre(eui, dev); 2327 case ARPHRD_6LOWPAN: 2328 return addrconf_ifid_6lowpan(eui, dev); 2329 case ARPHRD_IEEE1394: 2330 return addrconf_ifid_ieee1394(eui, dev); 2331 case ARPHRD_TUNNEL6: 2332 case ARPHRD_IP6GRE: 2333 case ARPHRD_RAWIP: 2334 return addrconf_ifid_ip6tnl(eui, dev); 2335 } 2336 return -1; 2337 } 2338 2339 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2340 { 2341 int err = -1; 2342 struct inet6_ifaddr *ifp; 2343 2344 read_lock_bh(&idev->lock); 2345 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2346 if (ifp->scope > IFA_LINK) 2347 break; 2348 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2349 memcpy(eui, ifp->addr.s6_addr+8, 8); 2350 err = 0; 2351 break; 2352 } 2353 } 2354 read_unlock_bh(&idev->lock); 2355 return err; 2356 } 2357 2358 /* Generation of a randomized Interface Identifier 2359 * draft-ietf-6man-rfc4941bis, Section 3.3.1 2360 */ 2361 2362 static void ipv6_gen_rnd_iid(struct in6_addr *addr) 2363 { 2364 regen: 2365 get_random_bytes(&addr->s6_addr[8], 8); 2366 2367 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1: 2368 * check if generated address is not inappropriate: 2369 * 2370 * - Reserved IPv6 Interface Identifiers 2371 * - XXX: already assigned to an address on the device 2372 */ 2373 2374 /* Subnet-router anycast: 0000:0000:0000:0000 */ 2375 if (!(addr->s6_addr32[2] | addr->s6_addr32[3])) 2376 goto regen; 2377 2378 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212 2379 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213 2380 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF 2381 */ 2382 if (ntohl(addr->s6_addr32[2]) == 0x02005eff && 2383 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000) 2384 goto regen; 2385 2386 /* Reserved subnet anycast addresses */ 2387 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff && 2388 ntohl(addr->s6_addr32[3]) >= 0Xffffff80) 2389 goto regen; 2390 } 2391 2392 /* 2393 * Add prefix route. 2394 */ 2395 2396 static void 2397 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric, 2398 struct net_device *dev, unsigned long expires, 2399 u32 flags, gfp_t gfp_flags) 2400 { 2401 struct fib6_config cfg = { 2402 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2403 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF, 2404 .fc_ifindex = dev->ifindex, 2405 .fc_expires = expires, 2406 .fc_dst_len = plen, 2407 .fc_flags = RTF_UP | flags, 2408 .fc_nlinfo.nl_net = dev_net(dev), 2409 .fc_protocol = RTPROT_KERNEL, 2410 .fc_type = RTN_UNICAST, 2411 }; 2412 2413 cfg.fc_dst = *pfx; 2414 2415 /* Prevent useless cloning on PtP SIT. 2416 This thing is done here expecting that the whole 2417 class of non-broadcast devices need not cloning. 2418 */ 2419 #if IS_ENABLED(CONFIG_IPV6_SIT) 2420 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2421 cfg.fc_flags |= RTF_NONEXTHOP; 2422 #endif 2423 2424 ip6_route_add(&cfg, gfp_flags, NULL); 2425 } 2426 2427 2428 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2429 int plen, 2430 const struct net_device *dev, 2431 u32 flags, u32 noflags, 2432 bool no_gw) 2433 { 2434 struct fib6_node *fn; 2435 struct fib6_info *rt = NULL; 2436 struct fib6_table *table; 2437 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2438 2439 table = fib6_get_table(dev_net(dev), tb_id); 2440 if (!table) 2441 return NULL; 2442 2443 rcu_read_lock(); 2444 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true); 2445 if (!fn) 2446 goto out; 2447 2448 for_each_fib6_node_rt_rcu(fn) { 2449 /* prefix routes only use builtin fib6_nh */ 2450 if (rt->nh) 2451 continue; 2452 2453 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex) 2454 continue; 2455 if (no_gw && rt->fib6_nh->fib_nh_gw_family) 2456 continue; 2457 if ((rt->fib6_flags & flags) != flags) 2458 continue; 2459 if ((rt->fib6_flags & noflags) != 0) 2460 continue; 2461 if (!fib6_info_hold_safe(rt)) 2462 continue; 2463 break; 2464 } 2465 out: 2466 rcu_read_unlock(); 2467 return rt; 2468 } 2469 2470 2471 /* Create "default" multicast route to the interface */ 2472 2473 static void addrconf_add_mroute(struct net_device *dev) 2474 { 2475 struct fib6_config cfg = { 2476 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2477 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2478 .fc_ifindex = dev->ifindex, 2479 .fc_dst_len = 8, 2480 .fc_flags = RTF_UP, 2481 .fc_type = RTN_MULTICAST, 2482 .fc_nlinfo.nl_net = dev_net(dev), 2483 .fc_protocol = RTPROT_KERNEL, 2484 }; 2485 2486 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2487 2488 ip6_route_add(&cfg, GFP_KERNEL, NULL); 2489 } 2490 2491 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2492 { 2493 struct inet6_dev *idev; 2494 2495 ASSERT_RTNL(); 2496 2497 idev = ipv6_find_idev(dev); 2498 if (IS_ERR(idev)) 2499 return idev; 2500 2501 if (idev->cnf.disable_ipv6) 2502 return ERR_PTR(-EACCES); 2503 2504 /* Add default multicast route */ 2505 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2506 addrconf_add_mroute(dev); 2507 2508 return idev; 2509 } 2510 2511 static void manage_tempaddrs(struct inet6_dev *idev, 2512 struct inet6_ifaddr *ifp, 2513 __u32 valid_lft, __u32 prefered_lft, 2514 bool create, unsigned long now) 2515 { 2516 u32 flags; 2517 struct inet6_ifaddr *ift; 2518 2519 read_lock_bh(&idev->lock); 2520 /* update all temporary addresses in the list */ 2521 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2522 int age, max_valid, max_prefered; 2523 2524 if (ifp != ift->ifpub) 2525 continue; 2526 2527 /* RFC 4941 section 3.3: 2528 * If a received option will extend the lifetime of a public 2529 * address, the lifetimes of temporary addresses should 2530 * be extended, subject to the overall constraint that no 2531 * temporary addresses should ever remain "valid" or "preferred" 2532 * for a time longer than (TEMP_VALID_LIFETIME) or 2533 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2534 */ 2535 age = (now - ift->cstamp) / HZ; 2536 max_valid = idev->cnf.temp_valid_lft - age; 2537 if (max_valid < 0) 2538 max_valid = 0; 2539 2540 max_prefered = idev->cnf.temp_prefered_lft - 2541 idev->desync_factor - age; 2542 if (max_prefered < 0) 2543 max_prefered = 0; 2544 2545 if (valid_lft > max_valid) 2546 valid_lft = max_valid; 2547 2548 if (prefered_lft > max_prefered) 2549 prefered_lft = max_prefered; 2550 2551 spin_lock(&ift->lock); 2552 flags = ift->flags; 2553 ift->valid_lft = valid_lft; 2554 ift->prefered_lft = prefered_lft; 2555 ift->tstamp = now; 2556 if (prefered_lft > 0) 2557 ift->flags &= ~IFA_F_DEPRECATED; 2558 2559 spin_unlock(&ift->lock); 2560 if (!(flags&IFA_F_TENTATIVE)) 2561 ipv6_ifa_notify(0, ift); 2562 } 2563 2564 if ((create || list_empty(&idev->tempaddr_list)) && 2565 idev->cnf.use_tempaddr > 0) { 2566 /* When a new public address is created as described 2567 * in [ADDRCONF], also create a new temporary address. 2568 * Also create a temporary address if it's enabled but 2569 * no temporary address currently exists. 2570 */ 2571 read_unlock_bh(&idev->lock); 2572 ipv6_create_tempaddr(ifp, false); 2573 } else { 2574 read_unlock_bh(&idev->lock); 2575 } 2576 } 2577 2578 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2579 { 2580 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2581 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2582 } 2583 2584 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2585 const struct prefix_info *pinfo, 2586 struct inet6_dev *in6_dev, 2587 const struct in6_addr *addr, int addr_type, 2588 u32 addr_flags, bool sllao, bool tokenized, 2589 __u32 valid_lft, u32 prefered_lft) 2590 { 2591 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2592 int create = 0, update_lft = 0; 2593 2594 if (!ifp && valid_lft) { 2595 int max_addresses = in6_dev->cnf.max_addresses; 2596 struct ifa6_config cfg = { 2597 .pfx = addr, 2598 .plen = pinfo->prefix_len, 2599 .ifa_flags = addr_flags, 2600 .valid_lft = valid_lft, 2601 .preferred_lft = prefered_lft, 2602 .scope = addr_type & IPV6_ADDR_SCOPE_MASK, 2603 }; 2604 2605 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2606 if ((net->ipv6.devconf_all->optimistic_dad || 2607 in6_dev->cnf.optimistic_dad) && 2608 !net->ipv6.devconf_all->forwarding && sllao) 2609 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 2610 #endif 2611 2612 /* Do not allow to create too much of autoconfigured 2613 * addresses; this would be too easy way to crash kernel. 2614 */ 2615 if (!max_addresses || 2616 ipv6_count_addresses(in6_dev) < max_addresses) 2617 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL); 2618 2619 if (IS_ERR_OR_NULL(ifp)) 2620 return -1; 2621 2622 create = 1; 2623 spin_lock_bh(&ifp->lock); 2624 ifp->flags |= IFA_F_MANAGETEMPADDR; 2625 ifp->cstamp = jiffies; 2626 ifp->tokenized = tokenized; 2627 spin_unlock_bh(&ifp->lock); 2628 addrconf_dad_start(ifp); 2629 } 2630 2631 if (ifp) { 2632 u32 flags; 2633 unsigned long now; 2634 u32 stored_lft; 2635 2636 /* update lifetime (RFC2462 5.5.3 e) */ 2637 spin_lock_bh(&ifp->lock); 2638 now = jiffies; 2639 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2640 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2641 else 2642 stored_lft = 0; 2643 if (!create && stored_lft) { 2644 const u32 minimum_lft = min_t(u32, 2645 stored_lft, MIN_VALID_LIFETIME); 2646 valid_lft = max(valid_lft, minimum_lft); 2647 2648 /* RFC4862 Section 5.5.3e: 2649 * "Note that the preferred lifetime of the 2650 * corresponding address is always reset to 2651 * the Preferred Lifetime in the received 2652 * Prefix Information option, regardless of 2653 * whether the valid lifetime is also reset or 2654 * ignored." 2655 * 2656 * So we should always update prefered_lft here. 2657 */ 2658 update_lft = 1; 2659 } 2660 2661 if (update_lft) { 2662 ifp->valid_lft = valid_lft; 2663 ifp->prefered_lft = prefered_lft; 2664 ifp->tstamp = now; 2665 flags = ifp->flags; 2666 ifp->flags &= ~IFA_F_DEPRECATED; 2667 spin_unlock_bh(&ifp->lock); 2668 2669 if (!(flags&IFA_F_TENTATIVE)) 2670 ipv6_ifa_notify(0, ifp); 2671 } else 2672 spin_unlock_bh(&ifp->lock); 2673 2674 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2675 create, now); 2676 2677 in6_ifa_put(ifp); 2678 addrconf_verify(); 2679 } 2680 2681 return 0; 2682 } 2683 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2684 2685 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2686 { 2687 struct prefix_info *pinfo; 2688 __u32 valid_lft; 2689 __u32 prefered_lft; 2690 int addr_type, err; 2691 u32 addr_flags = 0; 2692 struct inet6_dev *in6_dev; 2693 struct net *net = dev_net(dev); 2694 2695 pinfo = (struct prefix_info *) opt; 2696 2697 if (len < sizeof(struct prefix_info)) { 2698 netdev_dbg(dev, "addrconf: prefix option too short\n"); 2699 return; 2700 } 2701 2702 /* 2703 * Validation checks ([ADDRCONF], page 19) 2704 */ 2705 2706 addr_type = ipv6_addr_type(&pinfo->prefix); 2707 2708 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2709 return; 2710 2711 valid_lft = ntohl(pinfo->valid); 2712 prefered_lft = ntohl(pinfo->prefered); 2713 2714 if (prefered_lft > valid_lft) { 2715 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2716 return; 2717 } 2718 2719 in6_dev = in6_dev_get(dev); 2720 2721 if (!in6_dev) { 2722 net_dbg_ratelimited("addrconf: device %s not configured\n", 2723 dev->name); 2724 return; 2725 } 2726 2727 /* 2728 * Two things going on here: 2729 * 1) Add routes for on-link prefixes 2730 * 2) Configure prefixes with the auto flag set 2731 */ 2732 2733 if (pinfo->onlink) { 2734 struct fib6_info *rt; 2735 unsigned long rt_expires; 2736 2737 /* Avoid arithmetic overflow. Really, we could 2738 * save rt_expires in seconds, likely valid_lft, 2739 * but it would require division in fib gc, that it 2740 * not good. 2741 */ 2742 if (HZ > USER_HZ) 2743 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2744 else 2745 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2746 2747 if (addrconf_finite_timeout(rt_expires)) 2748 rt_expires *= HZ; 2749 2750 rt = addrconf_get_prefix_route(&pinfo->prefix, 2751 pinfo->prefix_len, 2752 dev, 2753 RTF_ADDRCONF | RTF_PREFIX_RT, 2754 RTF_DEFAULT, true); 2755 2756 if (rt) { 2757 /* Autoconf prefix route */ 2758 if (valid_lft == 0) { 2759 ip6_del_rt(net, rt, false); 2760 rt = NULL; 2761 } else if (addrconf_finite_timeout(rt_expires)) { 2762 /* not infinity */ 2763 fib6_set_expires(rt, jiffies + rt_expires); 2764 } else { 2765 fib6_clean_expires(rt); 2766 } 2767 } else if (valid_lft) { 2768 clock_t expires = 0; 2769 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2770 if (addrconf_finite_timeout(rt_expires)) { 2771 /* not infinity */ 2772 flags |= RTF_EXPIRES; 2773 expires = jiffies_to_clock_t(rt_expires); 2774 } 2775 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2776 0, dev, expires, flags, 2777 GFP_ATOMIC); 2778 } 2779 fib6_info_release(rt); 2780 } 2781 2782 /* Try to figure out our local address for this prefix */ 2783 2784 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2785 struct in6_addr addr; 2786 bool tokenized = false, dev_addr_generated = false; 2787 2788 if (pinfo->prefix_len == 64) { 2789 memcpy(&addr, &pinfo->prefix, 8); 2790 2791 if (!ipv6_addr_any(&in6_dev->token)) { 2792 read_lock_bh(&in6_dev->lock); 2793 memcpy(addr.s6_addr + 8, 2794 in6_dev->token.s6_addr + 8, 8); 2795 read_unlock_bh(&in6_dev->lock); 2796 tokenized = true; 2797 } else if (is_addr_mode_generate_stable(in6_dev) && 2798 !ipv6_generate_stable_address(&addr, 0, 2799 in6_dev)) { 2800 addr_flags |= IFA_F_STABLE_PRIVACY; 2801 goto ok; 2802 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2803 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2804 goto put; 2805 } else { 2806 dev_addr_generated = true; 2807 } 2808 goto ok; 2809 } 2810 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2811 pinfo->prefix_len); 2812 goto put; 2813 2814 ok: 2815 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2816 &addr, addr_type, 2817 addr_flags, sllao, 2818 tokenized, valid_lft, 2819 prefered_lft); 2820 if (err) 2821 goto put; 2822 2823 /* Ignore error case here because previous prefix add addr was 2824 * successful which will be notified. 2825 */ 2826 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2827 addr_type, addr_flags, sllao, 2828 tokenized, valid_lft, 2829 prefered_lft, 2830 dev_addr_generated); 2831 } 2832 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2833 put: 2834 in6_dev_put(in6_dev); 2835 } 2836 2837 static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev, 2838 struct in6_ifreq *ireq) 2839 { 2840 struct ip_tunnel_parm p = { }; 2841 int err; 2842 2843 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4)) 2844 return -EADDRNOTAVAIL; 2845 2846 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3]; 2847 p.iph.version = 4; 2848 p.iph.ihl = 5; 2849 p.iph.protocol = IPPROTO_IPV6; 2850 p.iph.ttl = 64; 2851 2852 if (!dev->netdev_ops->ndo_tunnel_ctl) 2853 return -EOPNOTSUPP; 2854 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL); 2855 if (err) 2856 return err; 2857 2858 dev = __dev_get_by_name(net, p.name); 2859 if (!dev) 2860 return -ENOBUFS; 2861 return dev_open(dev, NULL); 2862 } 2863 2864 /* 2865 * Set destination address. 2866 * Special case for SIT interfaces where we create a new "virtual" 2867 * device. 2868 */ 2869 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2870 { 2871 struct net_device *dev; 2872 struct in6_ifreq ireq; 2873 int err = -ENODEV; 2874 2875 if (!IS_ENABLED(CONFIG_IPV6_SIT)) 2876 return -ENODEV; 2877 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2878 return -EFAULT; 2879 2880 rtnl_lock(); 2881 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2882 if (dev && dev->type == ARPHRD_SIT) 2883 err = addrconf_set_sit_dstaddr(net, dev, &ireq); 2884 rtnl_unlock(); 2885 return err; 2886 } 2887 2888 static int ipv6_mc_config(struct sock *sk, bool join, 2889 const struct in6_addr *addr, int ifindex) 2890 { 2891 int ret; 2892 2893 ASSERT_RTNL(); 2894 2895 lock_sock(sk); 2896 if (join) 2897 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2898 else 2899 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2900 release_sock(sk); 2901 2902 return ret; 2903 } 2904 2905 /* 2906 * Manual configuration of address on an interface 2907 */ 2908 static int inet6_addr_add(struct net *net, int ifindex, 2909 struct ifa6_config *cfg, 2910 struct netlink_ext_ack *extack) 2911 { 2912 struct inet6_ifaddr *ifp; 2913 struct inet6_dev *idev; 2914 struct net_device *dev; 2915 unsigned long timeout; 2916 clock_t expires; 2917 u32 flags; 2918 2919 ASSERT_RTNL(); 2920 2921 if (cfg->plen > 128) 2922 return -EINVAL; 2923 2924 /* check the lifetime */ 2925 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 2926 return -EINVAL; 2927 2928 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) 2929 return -EINVAL; 2930 2931 dev = __dev_get_by_index(net, ifindex); 2932 if (!dev) 2933 return -ENODEV; 2934 2935 idev = addrconf_add_dev(dev); 2936 if (IS_ERR(idev)) 2937 return PTR_ERR(idev); 2938 2939 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2940 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2941 true, cfg->pfx, ifindex); 2942 2943 if (ret < 0) 2944 return ret; 2945 } 2946 2947 cfg->scope = ipv6_addr_scope(cfg->pfx); 2948 2949 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 2950 if (addrconf_finite_timeout(timeout)) { 2951 expires = jiffies_to_clock_t(timeout * HZ); 2952 cfg->valid_lft = timeout; 2953 flags = RTF_EXPIRES; 2954 } else { 2955 expires = 0; 2956 flags = 0; 2957 cfg->ifa_flags |= IFA_F_PERMANENT; 2958 } 2959 2960 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 2961 if (addrconf_finite_timeout(timeout)) { 2962 if (timeout == 0) 2963 cfg->ifa_flags |= IFA_F_DEPRECATED; 2964 cfg->preferred_lft = timeout; 2965 } 2966 2967 ifp = ipv6_add_addr(idev, cfg, true, extack); 2968 if (!IS_ERR(ifp)) { 2969 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 2970 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 2971 ifp->rt_priority, dev, expires, 2972 flags, GFP_KERNEL); 2973 } 2974 2975 /* Send a netlink notification if DAD is enabled and 2976 * optimistic flag is not set 2977 */ 2978 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD))) 2979 ipv6_ifa_notify(0, ifp); 2980 /* 2981 * Note that section 3.1 of RFC 4429 indicates 2982 * that the Optimistic flag should not be set for 2983 * manually configured addresses 2984 */ 2985 addrconf_dad_start(ifp); 2986 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR) 2987 manage_tempaddrs(idev, ifp, cfg->valid_lft, 2988 cfg->preferred_lft, true, jiffies); 2989 in6_ifa_put(ifp); 2990 addrconf_verify_rtnl(); 2991 return 0; 2992 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2993 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false, 2994 cfg->pfx, ifindex); 2995 } 2996 2997 return PTR_ERR(ifp); 2998 } 2999 3000 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 3001 const struct in6_addr *pfx, unsigned int plen) 3002 { 3003 struct inet6_ifaddr *ifp; 3004 struct inet6_dev *idev; 3005 struct net_device *dev; 3006 3007 if (plen > 128) 3008 return -EINVAL; 3009 3010 dev = __dev_get_by_index(net, ifindex); 3011 if (!dev) 3012 return -ENODEV; 3013 3014 idev = __in6_dev_get(dev); 3015 if (!idev) 3016 return -ENXIO; 3017 3018 read_lock_bh(&idev->lock); 3019 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3020 if (ifp->prefix_len == plen && 3021 ipv6_addr_equal(pfx, &ifp->addr)) { 3022 in6_ifa_hold(ifp); 3023 read_unlock_bh(&idev->lock); 3024 3025 if (!(ifp->flags & IFA_F_TEMPORARY) && 3026 (ifa_flags & IFA_F_MANAGETEMPADDR)) 3027 manage_tempaddrs(idev, ifp, 0, 0, false, 3028 jiffies); 3029 ipv6_del_addr(ifp); 3030 addrconf_verify_rtnl(); 3031 if (ipv6_addr_is_multicast(pfx)) { 3032 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 3033 false, pfx, dev->ifindex); 3034 } 3035 return 0; 3036 } 3037 } 3038 read_unlock_bh(&idev->lock); 3039 return -EADDRNOTAVAIL; 3040 } 3041 3042 3043 int addrconf_add_ifaddr(struct net *net, void __user *arg) 3044 { 3045 struct ifa6_config cfg = { 3046 .ifa_flags = IFA_F_PERMANENT, 3047 .preferred_lft = INFINITY_LIFE_TIME, 3048 .valid_lft = INFINITY_LIFE_TIME, 3049 }; 3050 struct in6_ifreq ireq; 3051 int err; 3052 3053 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3054 return -EPERM; 3055 3056 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3057 return -EFAULT; 3058 3059 cfg.pfx = &ireq.ifr6_addr; 3060 cfg.plen = ireq.ifr6_prefixlen; 3061 3062 rtnl_lock(); 3063 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL); 3064 rtnl_unlock(); 3065 return err; 3066 } 3067 3068 int addrconf_del_ifaddr(struct net *net, void __user *arg) 3069 { 3070 struct in6_ifreq ireq; 3071 int err; 3072 3073 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3074 return -EPERM; 3075 3076 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3077 return -EFAULT; 3078 3079 rtnl_lock(); 3080 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 3081 ireq.ifr6_prefixlen); 3082 rtnl_unlock(); 3083 return err; 3084 } 3085 3086 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 3087 int plen, int scope) 3088 { 3089 struct inet6_ifaddr *ifp; 3090 struct ifa6_config cfg = { 3091 .pfx = addr, 3092 .plen = plen, 3093 .ifa_flags = IFA_F_PERMANENT, 3094 .valid_lft = INFINITY_LIFE_TIME, 3095 .preferred_lft = INFINITY_LIFE_TIME, 3096 .scope = scope 3097 }; 3098 3099 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3100 if (!IS_ERR(ifp)) { 3101 spin_lock_bh(&ifp->lock); 3102 ifp->flags &= ~IFA_F_TENTATIVE; 3103 spin_unlock_bh(&ifp->lock); 3104 rt_genid_bump_ipv6(dev_net(idev->dev)); 3105 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3106 in6_ifa_put(ifp); 3107 } 3108 } 3109 3110 #if IS_ENABLED(CONFIG_IPV6_SIT) || IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3111 static void add_v4_addrs(struct inet6_dev *idev) 3112 { 3113 struct in6_addr addr; 3114 struct net_device *dev; 3115 struct net *net = dev_net(idev->dev); 3116 int scope, plen, offset = 0; 3117 u32 pflags = 0; 3118 3119 ASSERT_RTNL(); 3120 3121 memset(&addr, 0, sizeof(struct in6_addr)); 3122 /* in case of IP6GRE the dev_addr is an IPv6 and therefore we use only the last 4 bytes */ 3123 if (idev->dev->addr_len == sizeof(struct in6_addr)) 3124 offset = sizeof(struct in6_addr) - 4; 3125 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr + offset, 4); 3126 3127 if (idev->dev->flags&IFF_POINTOPOINT) { 3128 if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE) 3129 return; 3130 3131 addr.s6_addr32[0] = htonl(0xfe800000); 3132 scope = IFA_LINK; 3133 plen = 64; 3134 } else { 3135 scope = IPV6_ADDR_COMPATv4; 3136 plen = 96; 3137 pflags |= RTF_NONEXTHOP; 3138 } 3139 3140 if (addr.s6_addr32[3]) { 3141 add_addr(idev, &addr, plen, scope); 3142 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags, 3143 GFP_KERNEL); 3144 return; 3145 } 3146 3147 for_each_netdev(net, dev) { 3148 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3149 if (in_dev && (dev->flags & IFF_UP)) { 3150 struct in_ifaddr *ifa; 3151 int flag = scope; 3152 3153 in_dev_for_each_ifa_rtnl(ifa, in_dev) { 3154 addr.s6_addr32[3] = ifa->ifa_local; 3155 3156 if (ifa->ifa_scope == RT_SCOPE_LINK) 3157 continue; 3158 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3159 if (idev->dev->flags&IFF_POINTOPOINT) 3160 continue; 3161 flag |= IFA_HOST; 3162 } 3163 3164 add_addr(idev, &addr, plen, flag); 3165 addrconf_prefix_route(&addr, plen, 0, idev->dev, 3166 0, pflags, GFP_KERNEL); 3167 } 3168 } 3169 } 3170 } 3171 #endif 3172 3173 static void init_loopback(struct net_device *dev) 3174 { 3175 struct inet6_dev *idev; 3176 3177 /* ::1 */ 3178 3179 ASSERT_RTNL(); 3180 3181 idev = ipv6_find_idev(dev); 3182 if (IS_ERR(idev)) { 3183 pr_debug("%s: add_dev failed\n", __func__); 3184 return; 3185 } 3186 3187 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 3188 } 3189 3190 void addrconf_add_linklocal(struct inet6_dev *idev, 3191 const struct in6_addr *addr, u32 flags) 3192 { 3193 struct ifa6_config cfg = { 3194 .pfx = addr, 3195 .plen = 64, 3196 .ifa_flags = flags | IFA_F_PERMANENT, 3197 .valid_lft = INFINITY_LIFE_TIME, 3198 .preferred_lft = INFINITY_LIFE_TIME, 3199 .scope = IFA_LINK 3200 }; 3201 struct inet6_ifaddr *ifp; 3202 3203 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3204 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad || 3205 idev->cnf.optimistic_dad) && 3206 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3207 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 3208 #endif 3209 3210 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3211 if (!IS_ERR(ifp)) { 3212 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev, 3213 0, 0, GFP_ATOMIC); 3214 addrconf_dad_start(ifp); 3215 in6_ifa_put(ifp); 3216 } 3217 } 3218 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3219 3220 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3221 { 3222 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3223 return true; 3224 3225 if (address.s6_addr32[2] == htonl(0x02005eff) && 3226 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3227 return true; 3228 3229 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3230 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3231 return true; 3232 3233 return false; 3234 } 3235 3236 static int ipv6_generate_stable_address(struct in6_addr *address, 3237 u8 dad_count, 3238 const struct inet6_dev *idev) 3239 { 3240 static DEFINE_SPINLOCK(lock); 3241 static __u32 digest[SHA1_DIGEST_WORDS]; 3242 static __u32 workspace[SHA1_WORKSPACE_WORDS]; 3243 3244 static union { 3245 char __data[SHA1_BLOCK_SIZE]; 3246 struct { 3247 struct in6_addr secret; 3248 __be32 prefix[2]; 3249 unsigned char hwaddr[MAX_ADDR_LEN]; 3250 u8 dad_count; 3251 } __packed; 3252 } data; 3253 3254 struct in6_addr secret; 3255 struct in6_addr temp; 3256 struct net *net = dev_net(idev->dev); 3257 3258 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3259 3260 if (idev->cnf.stable_secret.initialized) 3261 secret = idev->cnf.stable_secret.secret; 3262 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3263 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3264 else 3265 return -1; 3266 3267 retry: 3268 spin_lock_bh(&lock); 3269 3270 sha1_init(digest); 3271 memset(&data, 0, sizeof(data)); 3272 memset(workspace, 0, sizeof(workspace)); 3273 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3274 data.prefix[0] = address->s6_addr32[0]; 3275 data.prefix[1] = address->s6_addr32[1]; 3276 data.secret = secret; 3277 data.dad_count = dad_count; 3278 3279 sha1_transform(digest, data.__data, workspace); 3280 3281 temp = *address; 3282 temp.s6_addr32[2] = (__force __be32)digest[0]; 3283 temp.s6_addr32[3] = (__force __be32)digest[1]; 3284 3285 spin_unlock_bh(&lock); 3286 3287 if (ipv6_reserved_interfaceid(temp)) { 3288 dad_count++; 3289 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3290 return -1; 3291 goto retry; 3292 } 3293 3294 *address = temp; 3295 return 0; 3296 } 3297 3298 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3299 { 3300 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3301 3302 if (s->initialized) 3303 return; 3304 s = &idev->cnf.stable_secret; 3305 get_random_bytes(&s->secret, sizeof(s->secret)); 3306 s->initialized = true; 3307 } 3308 3309 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3310 { 3311 struct in6_addr addr; 3312 3313 /* no link local addresses on L3 master devices */ 3314 if (netif_is_l3_master(idev->dev)) 3315 return; 3316 3317 /* no link local addresses on devices flagged as slaves */ 3318 if (idev->dev->flags & IFF_SLAVE) 3319 return; 3320 3321 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3322 3323 switch (idev->cnf.addr_gen_mode) { 3324 case IN6_ADDR_GEN_MODE_RANDOM: 3325 ipv6_gen_mode_random_init(idev); 3326 fallthrough; 3327 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3328 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3329 addrconf_add_linklocal(idev, &addr, 3330 IFA_F_STABLE_PRIVACY); 3331 else if (prefix_route) 3332 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3333 0, 0, GFP_KERNEL); 3334 break; 3335 case IN6_ADDR_GEN_MODE_EUI64: 3336 /* addrconf_add_linklocal also adds a prefix_route and we 3337 * only need to care about prefix routes if ipv6_generate_eui64 3338 * couldn't generate one. 3339 */ 3340 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3341 addrconf_add_linklocal(idev, &addr, 0); 3342 else if (prefix_route) 3343 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3344 0, 0, GFP_KERNEL); 3345 break; 3346 case IN6_ADDR_GEN_MODE_NONE: 3347 default: 3348 /* will not add any link local address */ 3349 break; 3350 } 3351 } 3352 3353 static void addrconf_dev_config(struct net_device *dev) 3354 { 3355 struct inet6_dev *idev; 3356 3357 ASSERT_RTNL(); 3358 3359 if ((dev->type != ARPHRD_ETHER) && 3360 (dev->type != ARPHRD_FDDI) && 3361 (dev->type != ARPHRD_ARCNET) && 3362 (dev->type != ARPHRD_INFINIBAND) && 3363 (dev->type != ARPHRD_IEEE1394) && 3364 (dev->type != ARPHRD_TUNNEL6) && 3365 (dev->type != ARPHRD_6LOWPAN) && 3366 (dev->type != ARPHRD_TUNNEL) && 3367 (dev->type != ARPHRD_NONE) && 3368 (dev->type != ARPHRD_RAWIP)) { 3369 /* Alas, we support only Ethernet autoconfiguration. */ 3370 idev = __in6_dev_get(dev); 3371 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP && 3372 dev->flags & IFF_MULTICAST) 3373 ipv6_mc_up(idev); 3374 return; 3375 } 3376 3377 idev = addrconf_add_dev(dev); 3378 if (IS_ERR(idev)) 3379 return; 3380 3381 /* this device type has no EUI support */ 3382 if (dev->type == ARPHRD_NONE && 3383 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3384 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3385 3386 addrconf_addr_gen(idev, false); 3387 } 3388 3389 #if IS_ENABLED(CONFIG_IPV6_SIT) 3390 static void addrconf_sit_config(struct net_device *dev) 3391 { 3392 struct inet6_dev *idev; 3393 3394 ASSERT_RTNL(); 3395 3396 /* 3397 * Configure the tunnel with one of our IPv4 3398 * addresses... we should configure all of 3399 * our v4 addrs in the tunnel 3400 */ 3401 3402 idev = ipv6_find_idev(dev); 3403 if (IS_ERR(idev)) { 3404 pr_debug("%s: add_dev failed\n", __func__); 3405 return; 3406 } 3407 3408 if (dev->priv_flags & IFF_ISATAP) { 3409 addrconf_addr_gen(idev, false); 3410 return; 3411 } 3412 3413 add_v4_addrs(idev); 3414 3415 if (dev->flags&IFF_POINTOPOINT) 3416 addrconf_add_mroute(dev); 3417 } 3418 #endif 3419 3420 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3421 static void addrconf_gre_config(struct net_device *dev) 3422 { 3423 struct inet6_dev *idev; 3424 3425 ASSERT_RTNL(); 3426 3427 idev = ipv6_find_idev(dev); 3428 if (IS_ERR(idev)) { 3429 pr_debug("%s: add_dev failed\n", __func__); 3430 return; 3431 } 3432 3433 if (dev->type == ARPHRD_ETHER) { 3434 addrconf_addr_gen(idev, true); 3435 return; 3436 } 3437 3438 add_v4_addrs(idev); 3439 3440 if (dev->flags & IFF_POINTOPOINT) 3441 addrconf_add_mroute(dev); 3442 } 3443 #endif 3444 3445 static int fixup_permanent_addr(struct net *net, 3446 struct inet6_dev *idev, 3447 struct inet6_ifaddr *ifp) 3448 { 3449 /* !fib6_node means the host route was removed from the 3450 * FIB, for example, if 'lo' device is taken down. In that 3451 * case regenerate the host route. 3452 */ 3453 if (!ifp->rt || !ifp->rt->fib6_node) { 3454 struct fib6_info *f6i, *prev; 3455 3456 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false, 3457 GFP_ATOMIC); 3458 if (IS_ERR(f6i)) 3459 return PTR_ERR(f6i); 3460 3461 /* ifp->rt can be accessed outside of rtnl */ 3462 spin_lock(&ifp->lock); 3463 prev = ifp->rt; 3464 ifp->rt = f6i; 3465 spin_unlock(&ifp->lock); 3466 3467 fib6_info_release(prev); 3468 } 3469 3470 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3471 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3472 ifp->rt_priority, idev->dev, 0, 0, 3473 GFP_ATOMIC); 3474 } 3475 3476 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3477 addrconf_dad_start(ifp); 3478 3479 return 0; 3480 } 3481 3482 static void addrconf_permanent_addr(struct net *net, struct net_device *dev) 3483 { 3484 struct inet6_ifaddr *ifp, *tmp; 3485 struct inet6_dev *idev; 3486 3487 idev = __in6_dev_get(dev); 3488 if (!idev) 3489 return; 3490 3491 write_lock_bh(&idev->lock); 3492 3493 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3494 if ((ifp->flags & IFA_F_PERMANENT) && 3495 fixup_permanent_addr(net, idev, ifp) < 0) { 3496 write_unlock_bh(&idev->lock); 3497 in6_ifa_hold(ifp); 3498 ipv6_del_addr(ifp); 3499 write_lock_bh(&idev->lock); 3500 3501 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3502 idev->dev->name, &ifp->addr); 3503 } 3504 } 3505 3506 write_unlock_bh(&idev->lock); 3507 } 3508 3509 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3510 void *ptr) 3511 { 3512 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3513 struct netdev_notifier_change_info *change_info; 3514 struct netdev_notifier_changeupper_info *info; 3515 struct inet6_dev *idev = __in6_dev_get(dev); 3516 struct net *net = dev_net(dev); 3517 int run_pending = 0; 3518 int err; 3519 3520 switch (event) { 3521 case NETDEV_REGISTER: 3522 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3523 idev = ipv6_add_dev(dev); 3524 if (IS_ERR(idev)) 3525 return notifier_from_errno(PTR_ERR(idev)); 3526 } 3527 break; 3528 3529 case NETDEV_CHANGEMTU: 3530 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3531 if (dev->mtu < IPV6_MIN_MTU) { 3532 addrconf_ifdown(dev, dev != net->loopback_dev); 3533 break; 3534 } 3535 3536 if (idev) { 3537 rt6_mtu_change(dev, dev->mtu); 3538 idev->cnf.mtu6 = dev->mtu; 3539 break; 3540 } 3541 3542 /* allocate new idev */ 3543 idev = ipv6_add_dev(dev); 3544 if (IS_ERR(idev)) 3545 break; 3546 3547 /* device is still not ready */ 3548 if (!(idev->if_flags & IF_READY)) 3549 break; 3550 3551 run_pending = 1; 3552 fallthrough; 3553 case NETDEV_UP: 3554 case NETDEV_CHANGE: 3555 if (dev->flags & IFF_SLAVE) 3556 break; 3557 3558 if (idev && idev->cnf.disable_ipv6) 3559 break; 3560 3561 if (event == NETDEV_UP) { 3562 /* restore routes for permanent addresses */ 3563 addrconf_permanent_addr(net, dev); 3564 3565 if (!addrconf_link_ready(dev)) { 3566 /* device is not ready yet. */ 3567 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3568 dev->name); 3569 break; 3570 } 3571 3572 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3573 idev = ipv6_add_dev(dev); 3574 3575 if (!IS_ERR_OR_NULL(idev)) { 3576 idev->if_flags |= IF_READY; 3577 run_pending = 1; 3578 } 3579 } else if (event == NETDEV_CHANGE) { 3580 if (!addrconf_link_ready(dev)) { 3581 /* device is still not ready. */ 3582 rt6_sync_down_dev(dev, event); 3583 break; 3584 } 3585 3586 if (!IS_ERR_OR_NULL(idev)) { 3587 if (idev->if_flags & IF_READY) { 3588 /* device is already configured - 3589 * but resend MLD reports, we might 3590 * have roamed and need to update 3591 * multicast snooping switches 3592 */ 3593 ipv6_mc_up(idev); 3594 change_info = ptr; 3595 if (change_info->flags_changed & IFF_NOARP) 3596 addrconf_dad_run(idev, true); 3597 rt6_sync_up(dev, RTNH_F_LINKDOWN); 3598 break; 3599 } 3600 idev->if_flags |= IF_READY; 3601 } 3602 3603 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3604 dev->name); 3605 3606 run_pending = 1; 3607 } 3608 3609 switch (dev->type) { 3610 #if IS_ENABLED(CONFIG_IPV6_SIT) 3611 case ARPHRD_SIT: 3612 addrconf_sit_config(dev); 3613 break; 3614 #endif 3615 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3616 case ARPHRD_IP6GRE: 3617 case ARPHRD_IPGRE: 3618 addrconf_gre_config(dev); 3619 break; 3620 #endif 3621 case ARPHRD_LOOPBACK: 3622 init_loopback(dev); 3623 break; 3624 3625 default: 3626 addrconf_dev_config(dev); 3627 break; 3628 } 3629 3630 if (!IS_ERR_OR_NULL(idev)) { 3631 if (run_pending) 3632 addrconf_dad_run(idev, false); 3633 3634 /* Device has an address by now */ 3635 rt6_sync_up(dev, RTNH_F_DEAD); 3636 3637 /* 3638 * If the MTU changed during the interface down, 3639 * when the interface up, the changed MTU must be 3640 * reflected in the idev as well as routers. 3641 */ 3642 if (idev->cnf.mtu6 != dev->mtu && 3643 dev->mtu >= IPV6_MIN_MTU) { 3644 rt6_mtu_change(dev, dev->mtu); 3645 idev->cnf.mtu6 = dev->mtu; 3646 } 3647 idev->tstamp = jiffies; 3648 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3649 3650 /* 3651 * If the changed mtu during down is lower than 3652 * IPV6_MIN_MTU stop IPv6 on this interface. 3653 */ 3654 if (dev->mtu < IPV6_MIN_MTU) 3655 addrconf_ifdown(dev, dev != net->loopback_dev); 3656 } 3657 break; 3658 3659 case NETDEV_DOWN: 3660 case NETDEV_UNREGISTER: 3661 /* 3662 * Remove all addresses from this interface. 3663 */ 3664 addrconf_ifdown(dev, event != NETDEV_DOWN); 3665 break; 3666 3667 case NETDEV_CHANGENAME: 3668 if (idev) { 3669 snmp6_unregister_dev(idev); 3670 addrconf_sysctl_unregister(idev); 3671 err = addrconf_sysctl_register(idev); 3672 if (err) 3673 return notifier_from_errno(err); 3674 err = snmp6_register_dev(idev); 3675 if (err) { 3676 addrconf_sysctl_unregister(idev); 3677 return notifier_from_errno(err); 3678 } 3679 } 3680 break; 3681 3682 case NETDEV_PRE_TYPE_CHANGE: 3683 case NETDEV_POST_TYPE_CHANGE: 3684 if (idev) 3685 addrconf_type_change(dev, event); 3686 break; 3687 3688 case NETDEV_CHANGEUPPER: 3689 info = ptr; 3690 3691 /* flush all routes if dev is linked to or unlinked from 3692 * an L3 master device (e.g., VRF) 3693 */ 3694 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3695 addrconf_ifdown(dev, false); 3696 } 3697 3698 return NOTIFY_OK; 3699 } 3700 3701 /* 3702 * addrconf module should be notified of a device going up 3703 */ 3704 static struct notifier_block ipv6_dev_notf = { 3705 .notifier_call = addrconf_notify, 3706 .priority = ADDRCONF_NOTIFY_PRIORITY, 3707 }; 3708 3709 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3710 { 3711 struct inet6_dev *idev; 3712 ASSERT_RTNL(); 3713 3714 idev = __in6_dev_get(dev); 3715 3716 if (event == NETDEV_POST_TYPE_CHANGE) 3717 ipv6_mc_remap(idev); 3718 else if (event == NETDEV_PRE_TYPE_CHANGE) 3719 ipv6_mc_unmap(idev); 3720 } 3721 3722 static bool addr_is_local(const struct in6_addr *addr) 3723 { 3724 return ipv6_addr_type(addr) & 3725 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3726 } 3727 3728 static int addrconf_ifdown(struct net_device *dev, bool unregister) 3729 { 3730 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN; 3731 struct net *net = dev_net(dev); 3732 struct inet6_dev *idev; 3733 struct inet6_ifaddr *ifa, *tmp; 3734 bool keep_addr = false; 3735 int state, i; 3736 3737 ASSERT_RTNL(); 3738 3739 rt6_disable_ip(dev, event); 3740 3741 idev = __in6_dev_get(dev); 3742 if (!idev) 3743 return -ENODEV; 3744 3745 /* 3746 * Step 1: remove reference to ipv6 device from parent device. 3747 * Do not dev_put! 3748 */ 3749 if (unregister) { 3750 idev->dead = 1; 3751 3752 /* protected by rtnl_lock */ 3753 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3754 3755 /* Step 1.5: remove snmp6 entry */ 3756 snmp6_unregister_dev(idev); 3757 3758 } 3759 3760 /* combine the user config with event to determine if permanent 3761 * addresses are to be removed from address hash table 3762 */ 3763 if (!unregister && !idev->cnf.disable_ipv6) { 3764 /* aggregate the system setting and interface setting */ 3765 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3766 3767 if (!_keep_addr) 3768 _keep_addr = idev->cnf.keep_addr_on_down; 3769 3770 keep_addr = (_keep_addr > 0); 3771 } 3772 3773 /* Step 2: clear hash table */ 3774 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3775 struct hlist_head *h = &inet6_addr_lst[i]; 3776 3777 spin_lock_bh(&addrconf_hash_lock); 3778 restart: 3779 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3780 if (ifa->idev == idev) { 3781 addrconf_del_dad_work(ifa); 3782 /* combined flag + permanent flag decide if 3783 * address is retained on a down event 3784 */ 3785 if (!keep_addr || 3786 !(ifa->flags & IFA_F_PERMANENT) || 3787 addr_is_local(&ifa->addr)) { 3788 hlist_del_init_rcu(&ifa->addr_lst); 3789 goto restart; 3790 } 3791 } 3792 } 3793 spin_unlock_bh(&addrconf_hash_lock); 3794 } 3795 3796 write_lock_bh(&idev->lock); 3797 3798 addrconf_del_rs_timer(idev); 3799 3800 /* Step 2: clear flags for stateless addrconf */ 3801 if (!unregister) 3802 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3803 3804 /* Step 3: clear tempaddr list */ 3805 while (!list_empty(&idev->tempaddr_list)) { 3806 ifa = list_first_entry(&idev->tempaddr_list, 3807 struct inet6_ifaddr, tmp_list); 3808 list_del(&ifa->tmp_list); 3809 write_unlock_bh(&idev->lock); 3810 spin_lock_bh(&ifa->lock); 3811 3812 if (ifa->ifpub) { 3813 in6_ifa_put(ifa->ifpub); 3814 ifa->ifpub = NULL; 3815 } 3816 spin_unlock_bh(&ifa->lock); 3817 in6_ifa_put(ifa); 3818 write_lock_bh(&idev->lock); 3819 } 3820 3821 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3822 struct fib6_info *rt = NULL; 3823 bool keep; 3824 3825 addrconf_del_dad_work(ifa); 3826 3827 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3828 !addr_is_local(&ifa->addr); 3829 3830 write_unlock_bh(&idev->lock); 3831 spin_lock_bh(&ifa->lock); 3832 3833 if (keep) { 3834 /* set state to skip the notifier below */ 3835 state = INET6_IFADDR_STATE_DEAD; 3836 ifa->state = INET6_IFADDR_STATE_PREDAD; 3837 if (!(ifa->flags & IFA_F_NODAD)) 3838 ifa->flags |= IFA_F_TENTATIVE; 3839 3840 rt = ifa->rt; 3841 ifa->rt = NULL; 3842 } else { 3843 state = ifa->state; 3844 ifa->state = INET6_IFADDR_STATE_DEAD; 3845 } 3846 3847 spin_unlock_bh(&ifa->lock); 3848 3849 if (rt) 3850 ip6_del_rt(net, rt, false); 3851 3852 if (state != INET6_IFADDR_STATE_DEAD) { 3853 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3854 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3855 } else { 3856 if (idev->cnf.forwarding) 3857 addrconf_leave_anycast(ifa); 3858 addrconf_leave_solict(ifa->idev, &ifa->addr); 3859 } 3860 3861 write_lock_bh(&idev->lock); 3862 if (!keep) { 3863 list_del_rcu(&ifa->if_list); 3864 in6_ifa_put(ifa); 3865 } 3866 } 3867 3868 write_unlock_bh(&idev->lock); 3869 3870 /* Step 5: Discard anycast and multicast list */ 3871 if (unregister) { 3872 ipv6_ac_destroy_dev(idev); 3873 ipv6_mc_destroy_dev(idev); 3874 } else { 3875 ipv6_mc_down(idev); 3876 } 3877 3878 idev->tstamp = jiffies; 3879 idev->ra_mtu = 0; 3880 3881 /* Last: Shot the device (if unregistered) */ 3882 if (unregister) { 3883 addrconf_sysctl_unregister(idev); 3884 neigh_parms_release(&nd_tbl, idev->nd_parms); 3885 neigh_ifdown(&nd_tbl, dev); 3886 in6_dev_put(idev); 3887 } 3888 return 0; 3889 } 3890 3891 static void addrconf_rs_timer(struct timer_list *t) 3892 { 3893 struct inet6_dev *idev = from_timer(idev, t, rs_timer); 3894 struct net_device *dev = idev->dev; 3895 struct in6_addr lladdr; 3896 3897 write_lock(&idev->lock); 3898 if (idev->dead || !(idev->if_flags & IF_READY)) 3899 goto out; 3900 3901 if (!ipv6_accept_ra(idev)) 3902 goto out; 3903 3904 /* Announcement received after solicitation was sent */ 3905 if (idev->if_flags & IF_RA_RCVD) 3906 goto out; 3907 3908 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3909 write_unlock(&idev->lock); 3910 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3911 ndisc_send_rs(dev, &lladdr, 3912 &in6addr_linklocal_allrouters); 3913 else 3914 goto put; 3915 3916 write_lock(&idev->lock); 3917 idev->rs_interval = rfc3315_s14_backoff_update( 3918 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3919 /* The wait after the last probe can be shorter */ 3920 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3921 idev->cnf.rtr_solicits) ? 3922 idev->cnf.rtr_solicit_delay : 3923 idev->rs_interval); 3924 } else { 3925 /* 3926 * Note: we do not support deprecated "all on-link" 3927 * assumption any longer. 3928 */ 3929 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3930 } 3931 3932 out: 3933 write_unlock(&idev->lock); 3934 put: 3935 in6_dev_put(idev); 3936 } 3937 3938 /* 3939 * Duplicate Address Detection 3940 */ 3941 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3942 { 3943 unsigned long rand_num; 3944 struct inet6_dev *idev = ifp->idev; 3945 u64 nonce; 3946 3947 if (ifp->flags & IFA_F_OPTIMISTIC) 3948 rand_num = 0; 3949 else 3950 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3951 3952 nonce = 0; 3953 if (idev->cnf.enhanced_dad || 3954 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 3955 do 3956 get_random_bytes(&nonce, 6); 3957 while (nonce == 0); 3958 } 3959 ifp->dad_nonce = nonce; 3960 ifp->dad_probes = idev->cnf.dad_transmits; 3961 addrconf_mod_dad_work(ifp, rand_num); 3962 } 3963 3964 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3965 { 3966 struct inet6_dev *idev = ifp->idev; 3967 struct net_device *dev = idev->dev; 3968 bool bump_id, notify = false; 3969 struct net *net; 3970 3971 addrconf_join_solict(dev, &ifp->addr); 3972 3973 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3974 3975 read_lock_bh(&idev->lock); 3976 spin_lock(&ifp->lock); 3977 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3978 goto out; 3979 3980 net = dev_net(dev); 3981 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3982 (net->ipv6.devconf_all->accept_dad < 1 && 3983 idev->cnf.accept_dad < 1) || 3984 !(ifp->flags&IFA_F_TENTATIVE) || 3985 ifp->flags & IFA_F_NODAD) { 3986 bool send_na = false; 3987 3988 if (ifp->flags & IFA_F_TENTATIVE && 3989 !(ifp->flags & IFA_F_OPTIMISTIC)) 3990 send_na = true; 3991 bump_id = ifp->flags & IFA_F_TENTATIVE; 3992 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3993 spin_unlock(&ifp->lock); 3994 read_unlock_bh(&idev->lock); 3995 3996 addrconf_dad_completed(ifp, bump_id, send_na); 3997 return; 3998 } 3999 4000 if (!(idev->if_flags & IF_READY)) { 4001 spin_unlock(&ifp->lock); 4002 read_unlock_bh(&idev->lock); 4003 /* 4004 * If the device is not ready: 4005 * - keep it tentative if it is a permanent address. 4006 * - otherwise, kill it. 4007 */ 4008 in6_ifa_hold(ifp); 4009 addrconf_dad_stop(ifp, 0); 4010 return; 4011 } 4012 4013 /* 4014 * Optimistic nodes can start receiving 4015 * Frames right away 4016 */ 4017 if (ifp->flags & IFA_F_OPTIMISTIC) { 4018 ip6_ins_rt(net, ifp->rt); 4019 if (ipv6_use_optimistic_addr(net, idev)) { 4020 /* Because optimistic nodes can use this address, 4021 * notify listeners. If DAD fails, RTM_DELADDR is sent. 4022 */ 4023 notify = true; 4024 } 4025 } 4026 4027 addrconf_dad_kick(ifp); 4028 out: 4029 spin_unlock(&ifp->lock); 4030 read_unlock_bh(&idev->lock); 4031 if (notify) 4032 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4033 } 4034 4035 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 4036 { 4037 bool begin_dad = false; 4038 4039 spin_lock_bh(&ifp->lock); 4040 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 4041 ifp->state = INET6_IFADDR_STATE_PREDAD; 4042 begin_dad = true; 4043 } 4044 spin_unlock_bh(&ifp->lock); 4045 4046 if (begin_dad) 4047 addrconf_mod_dad_work(ifp, 0); 4048 } 4049 4050 static void addrconf_dad_work(struct work_struct *w) 4051 { 4052 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 4053 struct inet6_ifaddr, 4054 dad_work); 4055 struct inet6_dev *idev = ifp->idev; 4056 bool bump_id, disable_ipv6 = false; 4057 struct in6_addr mcaddr; 4058 4059 enum { 4060 DAD_PROCESS, 4061 DAD_BEGIN, 4062 DAD_ABORT, 4063 } action = DAD_PROCESS; 4064 4065 rtnl_lock(); 4066 4067 spin_lock_bh(&ifp->lock); 4068 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 4069 action = DAD_BEGIN; 4070 ifp->state = INET6_IFADDR_STATE_DAD; 4071 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 4072 action = DAD_ABORT; 4073 ifp->state = INET6_IFADDR_STATE_POSTDAD; 4074 4075 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 || 4076 idev->cnf.accept_dad > 1) && 4077 !idev->cnf.disable_ipv6 && 4078 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 4079 struct in6_addr addr; 4080 4081 addr.s6_addr32[0] = htonl(0xfe800000); 4082 addr.s6_addr32[1] = 0; 4083 4084 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 4085 ipv6_addr_equal(&ifp->addr, &addr)) { 4086 /* DAD failed for link-local based on MAC */ 4087 idev->cnf.disable_ipv6 = 1; 4088 4089 pr_info("%s: IPv6 being disabled!\n", 4090 ifp->idev->dev->name); 4091 disable_ipv6 = true; 4092 } 4093 } 4094 } 4095 spin_unlock_bh(&ifp->lock); 4096 4097 if (action == DAD_BEGIN) { 4098 addrconf_dad_begin(ifp); 4099 goto out; 4100 } else if (action == DAD_ABORT) { 4101 in6_ifa_hold(ifp); 4102 addrconf_dad_stop(ifp, 1); 4103 if (disable_ipv6) 4104 addrconf_ifdown(idev->dev, false); 4105 goto out; 4106 } 4107 4108 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 4109 goto out; 4110 4111 write_lock_bh(&idev->lock); 4112 if (idev->dead || !(idev->if_flags & IF_READY)) { 4113 write_unlock_bh(&idev->lock); 4114 goto out; 4115 } 4116 4117 spin_lock(&ifp->lock); 4118 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 4119 spin_unlock(&ifp->lock); 4120 write_unlock_bh(&idev->lock); 4121 goto out; 4122 } 4123 4124 if (ifp->dad_probes == 0) { 4125 bool send_na = false; 4126 4127 /* 4128 * DAD was successful 4129 */ 4130 4131 if (ifp->flags & IFA_F_TENTATIVE && 4132 !(ifp->flags & IFA_F_OPTIMISTIC)) 4133 send_na = true; 4134 bump_id = ifp->flags & IFA_F_TENTATIVE; 4135 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4136 spin_unlock(&ifp->lock); 4137 write_unlock_bh(&idev->lock); 4138 4139 addrconf_dad_completed(ifp, bump_id, send_na); 4140 4141 goto out; 4142 } 4143 4144 ifp->dad_probes--; 4145 addrconf_mod_dad_work(ifp, 4146 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), 4147 HZ/100)); 4148 spin_unlock(&ifp->lock); 4149 write_unlock_bh(&idev->lock); 4150 4151 /* send a neighbour solicitation for our addr */ 4152 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 4153 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 4154 ifp->dad_nonce); 4155 out: 4156 in6_ifa_put(ifp); 4157 rtnl_unlock(); 4158 } 4159 4160 /* ifp->idev must be at least read locked */ 4161 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4162 { 4163 struct inet6_ifaddr *ifpiter; 4164 struct inet6_dev *idev = ifp->idev; 4165 4166 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4167 if (ifpiter->scope > IFA_LINK) 4168 break; 4169 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4170 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4171 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4172 IFA_F_PERMANENT) 4173 return false; 4174 } 4175 return true; 4176 } 4177 4178 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 4179 bool send_na) 4180 { 4181 struct net_device *dev = ifp->idev->dev; 4182 struct in6_addr lladdr; 4183 bool send_rs, send_mld; 4184 4185 addrconf_del_dad_work(ifp); 4186 4187 /* 4188 * Configure the address for reception. Now it is valid. 4189 */ 4190 4191 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4192 4193 /* If added prefix is link local and we are prepared to process 4194 router advertisements, start sending router solicitations. 4195 */ 4196 4197 read_lock_bh(&ifp->idev->lock); 4198 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4199 send_rs = send_mld && 4200 ipv6_accept_ra(ifp->idev) && 4201 ifp->idev->cnf.rtr_solicits != 0 && 4202 (dev->flags&IFF_LOOPBACK) == 0; 4203 read_unlock_bh(&ifp->idev->lock); 4204 4205 /* While dad is in progress mld report's source address is in6_addrany. 4206 * Resend with proper ll now. 4207 */ 4208 if (send_mld) 4209 ipv6_mc_dad_complete(ifp->idev); 4210 4211 /* send unsolicited NA if enabled */ 4212 if (send_na && 4213 (ifp->idev->cnf.ndisc_notify || 4214 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) { 4215 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr, 4216 /*router=*/ !!ifp->idev->cnf.forwarding, 4217 /*solicited=*/ false, /*override=*/ true, 4218 /*inc_opt=*/ true); 4219 } 4220 4221 if (send_rs) { 4222 /* 4223 * If a host as already performed a random delay 4224 * [...] as part of DAD [...] there is no need 4225 * to delay again before sending the first RS 4226 */ 4227 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4228 return; 4229 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4230 4231 write_lock_bh(&ifp->idev->lock); 4232 spin_lock(&ifp->lock); 4233 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4234 ifp->idev->cnf.rtr_solicit_interval); 4235 ifp->idev->rs_probes = 1; 4236 ifp->idev->if_flags |= IF_RS_SENT; 4237 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4238 spin_unlock(&ifp->lock); 4239 write_unlock_bh(&ifp->idev->lock); 4240 } 4241 4242 if (bump_id) 4243 rt_genid_bump_ipv6(dev_net(dev)); 4244 4245 /* Make sure that a new temporary address will be created 4246 * before this temporary address becomes deprecated. 4247 */ 4248 if (ifp->flags & IFA_F_TEMPORARY) 4249 addrconf_verify_rtnl(); 4250 } 4251 4252 static void addrconf_dad_run(struct inet6_dev *idev, bool restart) 4253 { 4254 struct inet6_ifaddr *ifp; 4255 4256 read_lock_bh(&idev->lock); 4257 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4258 spin_lock(&ifp->lock); 4259 if ((ifp->flags & IFA_F_TENTATIVE && 4260 ifp->state == INET6_IFADDR_STATE_DAD) || restart) { 4261 if (restart) 4262 ifp->state = INET6_IFADDR_STATE_PREDAD; 4263 addrconf_dad_kick(ifp); 4264 } 4265 spin_unlock(&ifp->lock); 4266 } 4267 read_unlock_bh(&idev->lock); 4268 } 4269 4270 #ifdef CONFIG_PROC_FS 4271 struct if6_iter_state { 4272 struct seq_net_private p; 4273 int bucket; 4274 int offset; 4275 }; 4276 4277 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4278 { 4279 struct if6_iter_state *state = seq->private; 4280 struct net *net = seq_file_net(seq); 4281 struct inet6_ifaddr *ifa = NULL; 4282 int p = 0; 4283 4284 /* initial bucket if pos is 0 */ 4285 if (pos == 0) { 4286 state->bucket = 0; 4287 state->offset = 0; 4288 } 4289 4290 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4291 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket], 4292 addr_lst) { 4293 if (!net_eq(dev_net(ifa->idev->dev), net)) 4294 continue; 4295 /* sync with offset */ 4296 if (p < state->offset) { 4297 p++; 4298 continue; 4299 } 4300 return ifa; 4301 } 4302 4303 /* prepare for next bucket */ 4304 state->offset = 0; 4305 p = 0; 4306 } 4307 return NULL; 4308 } 4309 4310 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4311 struct inet6_ifaddr *ifa) 4312 { 4313 struct if6_iter_state *state = seq->private; 4314 struct net *net = seq_file_net(seq); 4315 4316 hlist_for_each_entry_continue_rcu(ifa, addr_lst) { 4317 if (!net_eq(dev_net(ifa->idev->dev), net)) 4318 continue; 4319 state->offset++; 4320 return ifa; 4321 } 4322 4323 state->offset = 0; 4324 while (++state->bucket < IN6_ADDR_HSIZE) { 4325 hlist_for_each_entry_rcu(ifa, 4326 &inet6_addr_lst[state->bucket], addr_lst) { 4327 if (!net_eq(dev_net(ifa->idev->dev), net)) 4328 continue; 4329 return ifa; 4330 } 4331 } 4332 4333 return NULL; 4334 } 4335 4336 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4337 __acquires(rcu) 4338 { 4339 rcu_read_lock(); 4340 return if6_get_first(seq, *pos); 4341 } 4342 4343 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4344 { 4345 struct inet6_ifaddr *ifa; 4346 4347 ifa = if6_get_next(seq, v); 4348 ++*pos; 4349 return ifa; 4350 } 4351 4352 static void if6_seq_stop(struct seq_file *seq, void *v) 4353 __releases(rcu) 4354 { 4355 rcu_read_unlock(); 4356 } 4357 4358 static int if6_seq_show(struct seq_file *seq, void *v) 4359 { 4360 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4361 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4362 &ifp->addr, 4363 ifp->idev->dev->ifindex, 4364 ifp->prefix_len, 4365 ifp->scope, 4366 (u8) ifp->flags, 4367 ifp->idev->dev->name); 4368 return 0; 4369 } 4370 4371 static const struct seq_operations if6_seq_ops = { 4372 .start = if6_seq_start, 4373 .next = if6_seq_next, 4374 .show = if6_seq_show, 4375 .stop = if6_seq_stop, 4376 }; 4377 4378 static int __net_init if6_proc_net_init(struct net *net) 4379 { 4380 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops, 4381 sizeof(struct if6_iter_state))) 4382 return -ENOMEM; 4383 return 0; 4384 } 4385 4386 static void __net_exit if6_proc_net_exit(struct net *net) 4387 { 4388 remove_proc_entry("if_inet6", net->proc_net); 4389 } 4390 4391 static struct pernet_operations if6_proc_net_ops = { 4392 .init = if6_proc_net_init, 4393 .exit = if6_proc_net_exit, 4394 }; 4395 4396 int __init if6_proc_init(void) 4397 { 4398 return register_pernet_subsys(&if6_proc_net_ops); 4399 } 4400 4401 void if6_proc_exit(void) 4402 { 4403 unregister_pernet_subsys(&if6_proc_net_ops); 4404 } 4405 #endif /* CONFIG_PROC_FS */ 4406 4407 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4408 /* Check if address is a home address configured on any interface. */ 4409 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4410 { 4411 unsigned int hash = inet6_addr_hash(net, addr); 4412 struct inet6_ifaddr *ifp = NULL; 4413 int ret = 0; 4414 4415 rcu_read_lock(); 4416 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 4417 if (!net_eq(dev_net(ifp->idev->dev), net)) 4418 continue; 4419 if (ipv6_addr_equal(&ifp->addr, addr) && 4420 (ifp->flags & IFA_F_HOMEADDRESS)) { 4421 ret = 1; 4422 break; 4423 } 4424 } 4425 rcu_read_unlock(); 4426 return ret; 4427 } 4428 #endif 4429 4430 /* RFC6554 has some algorithm to avoid loops in segment routing by 4431 * checking if the segments contains any of a local interface address. 4432 * 4433 * Quote: 4434 * 4435 * To detect loops in the SRH, a router MUST determine if the SRH 4436 * includes multiple addresses assigned to any interface on that router. 4437 * If such addresses appear more than once and are separated by at least 4438 * one address not assigned to that router. 4439 */ 4440 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs, 4441 unsigned char nsegs) 4442 { 4443 const struct in6_addr *addr; 4444 int i, ret = 0, found = 0; 4445 struct inet6_ifaddr *ifp; 4446 bool separated = false; 4447 unsigned int hash; 4448 bool hash_found; 4449 4450 rcu_read_lock(); 4451 for (i = 0; i < nsegs; i++) { 4452 addr = &segs[i]; 4453 hash = inet6_addr_hash(net, addr); 4454 4455 hash_found = false; 4456 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 4457 if (!net_eq(dev_net(ifp->idev->dev), net)) 4458 continue; 4459 4460 if (ipv6_addr_equal(&ifp->addr, addr)) { 4461 hash_found = true; 4462 break; 4463 } 4464 } 4465 4466 if (hash_found) { 4467 if (found > 1 && separated) { 4468 ret = 1; 4469 break; 4470 } 4471 4472 separated = false; 4473 found++; 4474 } else { 4475 separated = true; 4476 } 4477 } 4478 rcu_read_unlock(); 4479 4480 return ret; 4481 } 4482 4483 /* 4484 * Periodic address status verification 4485 */ 4486 4487 static void addrconf_verify_rtnl(void) 4488 { 4489 unsigned long now, next, next_sec, next_sched; 4490 struct inet6_ifaddr *ifp; 4491 int i; 4492 4493 ASSERT_RTNL(); 4494 4495 rcu_read_lock_bh(); 4496 now = jiffies; 4497 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4498 4499 cancel_delayed_work(&addr_chk_work); 4500 4501 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4502 restart: 4503 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4504 unsigned long age; 4505 4506 /* When setting preferred_lft to a value not zero or 4507 * infinity, while valid_lft is infinity 4508 * IFA_F_PERMANENT has a non-infinity life time. 4509 */ 4510 if ((ifp->flags & IFA_F_PERMANENT) && 4511 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4512 continue; 4513 4514 spin_lock(&ifp->lock); 4515 /* We try to batch several events at once. */ 4516 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4517 4518 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4519 age >= ifp->valid_lft) { 4520 spin_unlock(&ifp->lock); 4521 in6_ifa_hold(ifp); 4522 rcu_read_unlock_bh(); 4523 ipv6_del_addr(ifp); 4524 rcu_read_lock_bh(); 4525 goto restart; 4526 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4527 spin_unlock(&ifp->lock); 4528 continue; 4529 } else if (age >= ifp->prefered_lft) { 4530 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4531 int deprecate = 0; 4532 4533 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4534 deprecate = 1; 4535 ifp->flags |= IFA_F_DEPRECATED; 4536 } 4537 4538 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4539 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4540 next = ifp->tstamp + ifp->valid_lft * HZ; 4541 4542 spin_unlock(&ifp->lock); 4543 4544 if (deprecate) { 4545 in6_ifa_hold(ifp); 4546 4547 ipv6_ifa_notify(0, ifp); 4548 in6_ifa_put(ifp); 4549 goto restart; 4550 } 4551 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4552 !(ifp->flags&IFA_F_TENTATIVE)) { 4553 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4554 ifp->idev->cnf.dad_transmits * 4555 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 4556 4557 if (age >= ifp->prefered_lft - regen_advance) { 4558 struct inet6_ifaddr *ifpub = ifp->ifpub; 4559 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4560 next = ifp->tstamp + ifp->prefered_lft * HZ; 4561 if (!ifp->regen_count && ifpub) { 4562 ifp->regen_count++; 4563 in6_ifa_hold(ifp); 4564 in6_ifa_hold(ifpub); 4565 spin_unlock(&ifp->lock); 4566 4567 spin_lock(&ifpub->lock); 4568 ifpub->regen_count = 0; 4569 spin_unlock(&ifpub->lock); 4570 rcu_read_unlock_bh(); 4571 ipv6_create_tempaddr(ifpub, true); 4572 in6_ifa_put(ifpub); 4573 in6_ifa_put(ifp); 4574 rcu_read_lock_bh(); 4575 goto restart; 4576 } 4577 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4578 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4579 spin_unlock(&ifp->lock); 4580 } else { 4581 /* ifp->prefered_lft <= ifp->valid_lft */ 4582 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4583 next = ifp->tstamp + ifp->prefered_lft * HZ; 4584 spin_unlock(&ifp->lock); 4585 } 4586 } 4587 } 4588 4589 next_sec = round_jiffies_up(next); 4590 next_sched = next; 4591 4592 /* If rounded timeout is accurate enough, accept it. */ 4593 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4594 next_sched = next_sec; 4595 4596 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4597 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4598 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4599 4600 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4601 now, next, next_sec, next_sched); 4602 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4603 rcu_read_unlock_bh(); 4604 } 4605 4606 static void addrconf_verify_work(struct work_struct *w) 4607 { 4608 rtnl_lock(); 4609 addrconf_verify_rtnl(); 4610 rtnl_unlock(); 4611 } 4612 4613 static void addrconf_verify(void) 4614 { 4615 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4616 } 4617 4618 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4619 struct in6_addr **peer_pfx) 4620 { 4621 struct in6_addr *pfx = NULL; 4622 4623 *peer_pfx = NULL; 4624 4625 if (addr) 4626 pfx = nla_data(addr); 4627 4628 if (local) { 4629 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4630 *peer_pfx = pfx; 4631 pfx = nla_data(local); 4632 } 4633 4634 return pfx; 4635 } 4636 4637 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4638 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4639 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4640 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4641 [IFA_FLAGS] = { .len = sizeof(u32) }, 4642 [IFA_RT_PRIORITY] = { .len = sizeof(u32) }, 4643 [IFA_TARGET_NETNSID] = { .type = NLA_S32 }, 4644 }; 4645 4646 static int 4647 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4648 struct netlink_ext_ack *extack) 4649 { 4650 struct net *net = sock_net(skb->sk); 4651 struct ifaddrmsg *ifm; 4652 struct nlattr *tb[IFA_MAX+1]; 4653 struct in6_addr *pfx, *peer_pfx; 4654 u32 ifa_flags; 4655 int err; 4656 4657 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4658 ifa_ipv6_policy, extack); 4659 if (err < 0) 4660 return err; 4661 4662 ifm = nlmsg_data(nlh); 4663 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4664 if (!pfx) 4665 return -EINVAL; 4666 4667 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4668 4669 /* We ignore other flags so far. */ 4670 ifa_flags &= IFA_F_MANAGETEMPADDR; 4671 4672 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4673 ifm->ifa_prefixlen); 4674 } 4675 4676 static int modify_prefix_route(struct inet6_ifaddr *ifp, 4677 unsigned long expires, u32 flags, 4678 bool modify_peer) 4679 { 4680 struct fib6_info *f6i; 4681 u32 prio; 4682 4683 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4684 ifp->prefix_len, 4685 ifp->idev->dev, 0, RTF_DEFAULT, true); 4686 if (!f6i) 4687 return -ENOENT; 4688 4689 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF; 4690 if (f6i->fib6_metric != prio) { 4691 /* delete old one */ 4692 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 4693 4694 /* add new one */ 4695 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4696 ifp->prefix_len, 4697 ifp->rt_priority, ifp->idev->dev, 4698 expires, flags, GFP_KERNEL); 4699 } else { 4700 if (!expires) 4701 fib6_clean_expires(f6i); 4702 else 4703 fib6_set_expires(f6i, expires); 4704 4705 fib6_info_release(f6i); 4706 } 4707 4708 return 0; 4709 } 4710 4711 static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg) 4712 { 4713 u32 flags; 4714 clock_t expires; 4715 unsigned long timeout; 4716 bool was_managetempaddr; 4717 bool had_prefixroute; 4718 bool new_peer = false; 4719 4720 ASSERT_RTNL(); 4721 4722 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 4723 return -EINVAL; 4724 4725 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && 4726 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4727 return -EINVAL; 4728 4729 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED) 4730 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC; 4731 4732 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 4733 if (addrconf_finite_timeout(timeout)) { 4734 expires = jiffies_to_clock_t(timeout * HZ); 4735 cfg->valid_lft = timeout; 4736 flags = RTF_EXPIRES; 4737 } else { 4738 expires = 0; 4739 flags = 0; 4740 cfg->ifa_flags |= IFA_F_PERMANENT; 4741 } 4742 4743 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 4744 if (addrconf_finite_timeout(timeout)) { 4745 if (timeout == 0) 4746 cfg->ifa_flags |= IFA_F_DEPRECATED; 4747 cfg->preferred_lft = timeout; 4748 } 4749 4750 if (cfg->peer_pfx && 4751 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) { 4752 if (!ipv6_addr_any(&ifp->peer_addr)) 4753 cleanup_prefix_route(ifp, expires, true, true); 4754 new_peer = true; 4755 } 4756 4757 spin_lock_bh(&ifp->lock); 4758 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4759 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4760 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4761 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4762 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4763 IFA_F_NOPREFIXROUTE); 4764 ifp->flags |= cfg->ifa_flags; 4765 ifp->tstamp = jiffies; 4766 ifp->valid_lft = cfg->valid_lft; 4767 ifp->prefered_lft = cfg->preferred_lft; 4768 4769 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority) 4770 ifp->rt_priority = cfg->rt_priority; 4771 4772 if (new_peer) 4773 ifp->peer_addr = *cfg->peer_pfx; 4774 4775 spin_unlock_bh(&ifp->lock); 4776 if (!(ifp->flags&IFA_F_TENTATIVE)) 4777 ipv6_ifa_notify(0, ifp); 4778 4779 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 4780 int rc = -ENOENT; 4781 4782 if (had_prefixroute) 4783 rc = modify_prefix_route(ifp, expires, flags, false); 4784 4785 /* prefix route could have been deleted; if so restore it */ 4786 if (rc == -ENOENT) { 4787 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4788 ifp->rt_priority, ifp->idev->dev, 4789 expires, flags, GFP_KERNEL); 4790 } 4791 4792 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr)) 4793 rc = modify_prefix_route(ifp, expires, flags, true); 4794 4795 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) { 4796 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len, 4797 ifp->rt_priority, ifp->idev->dev, 4798 expires, flags, GFP_KERNEL); 4799 } 4800 } else if (had_prefixroute) { 4801 enum cleanup_prefix_rt_t action; 4802 unsigned long rt_expires; 4803 4804 write_lock_bh(&ifp->idev->lock); 4805 action = check_cleanup_prefix_route(ifp, &rt_expires); 4806 write_unlock_bh(&ifp->idev->lock); 4807 4808 if (action != CLEANUP_PREFIX_RT_NOP) { 4809 cleanup_prefix_route(ifp, rt_expires, 4810 action == CLEANUP_PREFIX_RT_DEL, false); 4811 } 4812 } 4813 4814 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4815 if (was_managetempaddr && 4816 !(ifp->flags & IFA_F_MANAGETEMPADDR)) { 4817 cfg->valid_lft = 0; 4818 cfg->preferred_lft = 0; 4819 } 4820 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft, 4821 cfg->preferred_lft, !was_managetempaddr, 4822 jiffies); 4823 } 4824 4825 addrconf_verify_rtnl(); 4826 4827 return 0; 4828 } 4829 4830 static int 4831 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4832 struct netlink_ext_ack *extack) 4833 { 4834 struct net *net = sock_net(skb->sk); 4835 struct ifaddrmsg *ifm; 4836 struct nlattr *tb[IFA_MAX+1]; 4837 struct in6_addr *peer_pfx; 4838 struct inet6_ifaddr *ifa; 4839 struct net_device *dev; 4840 struct inet6_dev *idev; 4841 struct ifa6_config cfg; 4842 int err; 4843 4844 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4845 ifa_ipv6_policy, extack); 4846 if (err < 0) 4847 return err; 4848 4849 memset(&cfg, 0, sizeof(cfg)); 4850 4851 ifm = nlmsg_data(nlh); 4852 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4853 if (!cfg.pfx) 4854 return -EINVAL; 4855 4856 cfg.peer_pfx = peer_pfx; 4857 cfg.plen = ifm->ifa_prefixlen; 4858 if (tb[IFA_RT_PRIORITY]) 4859 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]); 4860 4861 cfg.valid_lft = INFINITY_LIFE_TIME; 4862 cfg.preferred_lft = INFINITY_LIFE_TIME; 4863 4864 if (tb[IFA_CACHEINFO]) { 4865 struct ifa_cacheinfo *ci; 4866 4867 ci = nla_data(tb[IFA_CACHEINFO]); 4868 cfg.valid_lft = ci->ifa_valid; 4869 cfg.preferred_lft = ci->ifa_prefered; 4870 } 4871 4872 dev = __dev_get_by_index(net, ifm->ifa_index); 4873 if (!dev) 4874 return -ENODEV; 4875 4876 if (tb[IFA_FLAGS]) 4877 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]); 4878 else 4879 cfg.ifa_flags = ifm->ifa_flags; 4880 4881 /* We ignore other flags so far. */ 4882 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | 4883 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE | 4884 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC; 4885 4886 idev = ipv6_find_idev(dev); 4887 if (IS_ERR(idev)) 4888 return PTR_ERR(idev); 4889 4890 if (!ipv6_allow_optimistic_dad(net, idev)) 4891 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC; 4892 4893 if (cfg.ifa_flags & IFA_F_NODAD && 4894 cfg.ifa_flags & IFA_F_OPTIMISTIC) { 4895 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive"); 4896 return -EINVAL; 4897 } 4898 4899 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1); 4900 if (!ifa) { 4901 /* 4902 * It would be best to check for !NLM_F_CREATE here but 4903 * userspace already relies on not having to provide this. 4904 */ 4905 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack); 4906 } 4907 4908 if (nlh->nlmsg_flags & NLM_F_EXCL || 4909 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4910 err = -EEXIST; 4911 else 4912 err = inet6_addr_modify(ifa, &cfg); 4913 4914 in6_ifa_put(ifa); 4915 4916 return err; 4917 } 4918 4919 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4920 u8 scope, int ifindex) 4921 { 4922 struct ifaddrmsg *ifm; 4923 4924 ifm = nlmsg_data(nlh); 4925 ifm->ifa_family = AF_INET6; 4926 ifm->ifa_prefixlen = prefixlen; 4927 ifm->ifa_flags = flags; 4928 ifm->ifa_scope = scope; 4929 ifm->ifa_index = ifindex; 4930 } 4931 4932 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4933 unsigned long tstamp, u32 preferred, u32 valid) 4934 { 4935 struct ifa_cacheinfo ci; 4936 4937 ci.cstamp = cstamp_delta(cstamp); 4938 ci.tstamp = cstamp_delta(tstamp); 4939 ci.ifa_prefered = preferred; 4940 ci.ifa_valid = valid; 4941 4942 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4943 } 4944 4945 static inline int rt_scope(int ifa_scope) 4946 { 4947 if (ifa_scope & IFA_HOST) 4948 return RT_SCOPE_HOST; 4949 else if (ifa_scope & IFA_LINK) 4950 return RT_SCOPE_LINK; 4951 else if (ifa_scope & IFA_SITE) 4952 return RT_SCOPE_SITE; 4953 else 4954 return RT_SCOPE_UNIVERSE; 4955 } 4956 4957 static inline int inet6_ifaddr_msgsize(void) 4958 { 4959 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4960 + nla_total_size(16) /* IFA_LOCAL */ 4961 + nla_total_size(16) /* IFA_ADDRESS */ 4962 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4963 + nla_total_size(4) /* IFA_FLAGS */ 4964 + nla_total_size(4) /* IFA_RT_PRIORITY */; 4965 } 4966 4967 enum addr_type_t { 4968 UNICAST_ADDR, 4969 MULTICAST_ADDR, 4970 ANYCAST_ADDR, 4971 }; 4972 4973 struct inet6_fill_args { 4974 u32 portid; 4975 u32 seq; 4976 int event; 4977 unsigned int flags; 4978 int netnsid; 4979 int ifindex; 4980 enum addr_type_t type; 4981 }; 4982 4983 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4984 struct inet6_fill_args *args) 4985 { 4986 struct nlmsghdr *nlh; 4987 u32 preferred, valid; 4988 4989 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 4990 sizeof(struct ifaddrmsg), args->flags); 4991 if (!nlh) 4992 return -EMSGSIZE; 4993 4994 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4995 ifa->idev->dev->ifindex); 4996 4997 if (args->netnsid >= 0 && 4998 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 4999 goto error; 5000 5001 if (!((ifa->flags&IFA_F_PERMANENT) && 5002 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 5003 preferred = ifa->prefered_lft; 5004 valid = ifa->valid_lft; 5005 if (preferred != INFINITY_LIFE_TIME) { 5006 long tval = (jiffies - ifa->tstamp)/HZ; 5007 if (preferred > tval) 5008 preferred -= tval; 5009 else 5010 preferred = 0; 5011 if (valid != INFINITY_LIFE_TIME) { 5012 if (valid > tval) 5013 valid -= tval; 5014 else 5015 valid = 0; 5016 } 5017 } 5018 } else { 5019 preferred = INFINITY_LIFE_TIME; 5020 valid = INFINITY_LIFE_TIME; 5021 } 5022 5023 if (!ipv6_addr_any(&ifa->peer_addr)) { 5024 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 5025 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 5026 goto error; 5027 } else 5028 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 5029 goto error; 5030 5031 if (ifa->rt_priority && 5032 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority)) 5033 goto error; 5034 5035 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 5036 goto error; 5037 5038 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 5039 goto error; 5040 5041 nlmsg_end(skb, nlh); 5042 return 0; 5043 5044 error: 5045 nlmsg_cancel(skb, nlh); 5046 return -EMSGSIZE; 5047 } 5048 5049 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 5050 struct inet6_fill_args *args) 5051 { 5052 struct nlmsghdr *nlh; 5053 u8 scope = RT_SCOPE_UNIVERSE; 5054 int ifindex = ifmca->idev->dev->ifindex; 5055 5056 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 5057 scope = RT_SCOPE_SITE; 5058 5059 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5060 sizeof(struct ifaddrmsg), args->flags); 5061 if (!nlh) 5062 return -EMSGSIZE; 5063 5064 if (args->netnsid >= 0 && 5065 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5066 nlmsg_cancel(skb, nlh); 5067 return -EMSGSIZE; 5068 } 5069 5070 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5071 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 5072 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 5073 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5074 nlmsg_cancel(skb, nlh); 5075 return -EMSGSIZE; 5076 } 5077 5078 nlmsg_end(skb, nlh); 5079 return 0; 5080 } 5081 5082 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 5083 struct inet6_fill_args *args) 5084 { 5085 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt); 5086 int ifindex = dev ? dev->ifindex : 1; 5087 struct nlmsghdr *nlh; 5088 u8 scope = RT_SCOPE_UNIVERSE; 5089 5090 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 5091 scope = RT_SCOPE_SITE; 5092 5093 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5094 sizeof(struct ifaddrmsg), args->flags); 5095 if (!nlh) 5096 return -EMSGSIZE; 5097 5098 if (args->netnsid >= 0 && 5099 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5100 nlmsg_cancel(skb, nlh); 5101 return -EMSGSIZE; 5102 } 5103 5104 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5105 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 5106 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 5107 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5108 nlmsg_cancel(skb, nlh); 5109 return -EMSGSIZE; 5110 } 5111 5112 nlmsg_end(skb, nlh); 5113 return 0; 5114 } 5115 5116 /* called with rcu_read_lock() */ 5117 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 5118 struct netlink_callback *cb, int s_ip_idx, 5119 struct inet6_fill_args *fillargs) 5120 { 5121 struct ifmcaddr6 *ifmca; 5122 struct ifacaddr6 *ifaca; 5123 int ip_idx = 0; 5124 int err = 1; 5125 5126 read_lock_bh(&idev->lock); 5127 switch (fillargs->type) { 5128 case UNICAST_ADDR: { 5129 struct inet6_ifaddr *ifa; 5130 fillargs->event = RTM_NEWADDR; 5131 5132 /* unicast address incl. temp addr */ 5133 list_for_each_entry(ifa, &idev->addr_list, if_list) { 5134 if (ip_idx < s_ip_idx) 5135 goto next; 5136 err = inet6_fill_ifaddr(skb, ifa, fillargs); 5137 if (err < 0) 5138 break; 5139 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 5140 next: 5141 ip_idx++; 5142 } 5143 break; 5144 } 5145 case MULTICAST_ADDR: 5146 read_unlock_bh(&idev->lock); 5147 fillargs->event = RTM_GETMULTICAST; 5148 5149 /* multicast address */ 5150 for (ifmca = rcu_dereference(idev->mc_list); 5151 ifmca; 5152 ifmca = rcu_dereference(ifmca->next), ip_idx++) { 5153 if (ip_idx < s_ip_idx) 5154 continue; 5155 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs); 5156 if (err < 0) 5157 break; 5158 } 5159 read_lock_bh(&idev->lock); 5160 break; 5161 case ANYCAST_ADDR: 5162 fillargs->event = RTM_GETANYCAST; 5163 /* anycast address */ 5164 for (ifaca = idev->ac_list; ifaca; 5165 ifaca = ifaca->aca_next, ip_idx++) { 5166 if (ip_idx < s_ip_idx) 5167 continue; 5168 err = inet6_fill_ifacaddr(skb, ifaca, fillargs); 5169 if (err < 0) 5170 break; 5171 } 5172 break; 5173 default: 5174 break; 5175 } 5176 read_unlock_bh(&idev->lock); 5177 cb->args[2] = ip_idx; 5178 return err; 5179 } 5180 5181 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh, 5182 struct inet6_fill_args *fillargs, 5183 struct net **tgt_net, struct sock *sk, 5184 struct netlink_callback *cb) 5185 { 5186 struct netlink_ext_ack *extack = cb->extack; 5187 struct nlattr *tb[IFA_MAX+1]; 5188 struct ifaddrmsg *ifm; 5189 int err, i; 5190 5191 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5192 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request"); 5193 return -EINVAL; 5194 } 5195 5196 ifm = nlmsg_data(nlh); 5197 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5198 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request"); 5199 return -EINVAL; 5200 } 5201 5202 fillargs->ifindex = ifm->ifa_index; 5203 if (fillargs->ifindex) { 5204 cb->answer_flags |= NLM_F_DUMP_FILTERED; 5205 fillargs->flags |= NLM_F_DUMP_FILTERED; 5206 } 5207 5208 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5209 ifa_ipv6_policy, extack); 5210 if (err < 0) 5211 return err; 5212 5213 for (i = 0; i <= IFA_MAX; ++i) { 5214 if (!tb[i]) 5215 continue; 5216 5217 if (i == IFA_TARGET_NETNSID) { 5218 struct net *net; 5219 5220 fillargs->netnsid = nla_get_s32(tb[i]); 5221 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid); 5222 if (IS_ERR(net)) { 5223 fillargs->netnsid = -1; 5224 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id"); 5225 return PTR_ERR(net); 5226 } 5227 *tgt_net = net; 5228 } else { 5229 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); 5230 return -EINVAL; 5231 } 5232 } 5233 5234 return 0; 5235 } 5236 5237 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 5238 enum addr_type_t type) 5239 { 5240 const struct nlmsghdr *nlh = cb->nlh; 5241 struct inet6_fill_args fillargs = { 5242 .portid = NETLINK_CB(cb->skb).portid, 5243 .seq = cb->nlh->nlmsg_seq, 5244 .flags = NLM_F_MULTI, 5245 .netnsid = -1, 5246 .type = type, 5247 }; 5248 struct net *tgt_net = sock_net(skb->sk); 5249 int idx, s_idx, s_ip_idx; 5250 int h, s_h; 5251 struct net_device *dev; 5252 struct inet6_dev *idev; 5253 struct hlist_head *head; 5254 int err = 0; 5255 5256 s_h = cb->args[0]; 5257 s_idx = idx = cb->args[1]; 5258 s_ip_idx = cb->args[2]; 5259 5260 if (cb->strict_check) { 5261 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net, 5262 skb->sk, cb); 5263 if (err < 0) 5264 goto put_tgt_net; 5265 5266 err = 0; 5267 if (fillargs.ifindex) { 5268 dev = __dev_get_by_index(tgt_net, fillargs.ifindex); 5269 if (!dev) { 5270 err = -ENODEV; 5271 goto put_tgt_net; 5272 } 5273 idev = __in6_dev_get(dev); 5274 if (idev) { 5275 err = in6_dump_addrs(idev, skb, cb, s_ip_idx, 5276 &fillargs); 5277 if (err > 0) 5278 err = 0; 5279 } 5280 goto put_tgt_net; 5281 } 5282 } 5283 5284 rcu_read_lock(); 5285 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq; 5286 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5287 idx = 0; 5288 head = &tgt_net->dev_index_head[h]; 5289 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5290 if (idx < s_idx) 5291 goto cont; 5292 if (h > s_h || idx > s_idx) 5293 s_ip_idx = 0; 5294 idev = __in6_dev_get(dev); 5295 if (!idev) 5296 goto cont; 5297 5298 if (in6_dump_addrs(idev, skb, cb, s_ip_idx, 5299 &fillargs) < 0) 5300 goto done; 5301 cont: 5302 idx++; 5303 } 5304 } 5305 done: 5306 rcu_read_unlock(); 5307 cb->args[0] = h; 5308 cb->args[1] = idx; 5309 put_tgt_net: 5310 if (fillargs.netnsid >= 0) 5311 put_net(tgt_net); 5312 5313 return skb->len ? : err; 5314 } 5315 5316 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 5317 { 5318 enum addr_type_t type = UNICAST_ADDR; 5319 5320 return inet6_dump_addr(skb, cb, type); 5321 } 5322 5323 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 5324 { 5325 enum addr_type_t type = MULTICAST_ADDR; 5326 5327 return inet6_dump_addr(skb, cb, type); 5328 } 5329 5330 5331 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 5332 { 5333 enum addr_type_t type = ANYCAST_ADDR; 5334 5335 return inet6_dump_addr(skb, cb, type); 5336 } 5337 5338 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb, 5339 const struct nlmsghdr *nlh, 5340 struct nlattr **tb, 5341 struct netlink_ext_ack *extack) 5342 { 5343 struct ifaddrmsg *ifm; 5344 int i, err; 5345 5346 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5347 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request"); 5348 return -EINVAL; 5349 } 5350 5351 if (!netlink_strict_get_check(skb)) 5352 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 5353 ifa_ipv6_policy, extack); 5354 5355 ifm = nlmsg_data(nlh); 5356 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5357 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request"); 5358 return -EINVAL; 5359 } 5360 5361 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5362 ifa_ipv6_policy, extack); 5363 if (err) 5364 return err; 5365 5366 for (i = 0; i <= IFA_MAX; i++) { 5367 if (!tb[i]) 5368 continue; 5369 5370 switch (i) { 5371 case IFA_TARGET_NETNSID: 5372 case IFA_ADDRESS: 5373 case IFA_LOCAL: 5374 break; 5375 default: 5376 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request"); 5377 return -EINVAL; 5378 } 5379 } 5380 5381 return 0; 5382 } 5383 5384 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 5385 struct netlink_ext_ack *extack) 5386 { 5387 struct net *tgt_net = sock_net(in_skb->sk); 5388 struct inet6_fill_args fillargs = { 5389 .portid = NETLINK_CB(in_skb).portid, 5390 .seq = nlh->nlmsg_seq, 5391 .event = RTM_NEWADDR, 5392 .flags = 0, 5393 .netnsid = -1, 5394 }; 5395 struct ifaddrmsg *ifm; 5396 struct nlattr *tb[IFA_MAX+1]; 5397 struct in6_addr *addr = NULL, *peer; 5398 struct net_device *dev = NULL; 5399 struct inet6_ifaddr *ifa; 5400 struct sk_buff *skb; 5401 int err; 5402 5403 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack); 5404 if (err < 0) 5405 return err; 5406 5407 if (tb[IFA_TARGET_NETNSID]) { 5408 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]); 5409 5410 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk, 5411 fillargs.netnsid); 5412 if (IS_ERR(tgt_net)) 5413 return PTR_ERR(tgt_net); 5414 } 5415 5416 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 5417 if (!addr) 5418 return -EINVAL; 5419 5420 ifm = nlmsg_data(nlh); 5421 if (ifm->ifa_index) 5422 dev = dev_get_by_index(tgt_net, ifm->ifa_index); 5423 5424 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1); 5425 if (!ifa) { 5426 err = -EADDRNOTAVAIL; 5427 goto errout; 5428 } 5429 5430 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 5431 if (!skb) { 5432 err = -ENOBUFS; 5433 goto errout_ifa; 5434 } 5435 5436 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5437 if (err < 0) { 5438 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5439 WARN_ON(err == -EMSGSIZE); 5440 kfree_skb(skb); 5441 goto errout_ifa; 5442 } 5443 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid); 5444 errout_ifa: 5445 in6_ifa_put(ifa); 5446 errout: 5447 dev_put(dev); 5448 if (fillargs.netnsid >= 0) 5449 put_net(tgt_net); 5450 5451 return err; 5452 } 5453 5454 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 5455 { 5456 struct sk_buff *skb; 5457 struct net *net = dev_net(ifa->idev->dev); 5458 struct inet6_fill_args fillargs = { 5459 .portid = 0, 5460 .seq = 0, 5461 .event = event, 5462 .flags = 0, 5463 .netnsid = -1, 5464 }; 5465 int err = -ENOBUFS; 5466 5467 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 5468 if (!skb) 5469 goto errout; 5470 5471 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5472 if (err < 0) { 5473 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5474 WARN_ON(err == -EMSGSIZE); 5475 kfree_skb(skb); 5476 goto errout; 5477 } 5478 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 5479 return; 5480 errout: 5481 if (err < 0) 5482 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 5483 } 5484 5485 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 5486 __s32 *array, int bytes) 5487 { 5488 BUG_ON(bytes < (DEVCONF_MAX * 4)); 5489 5490 memset(array, 0, bytes); 5491 array[DEVCONF_FORWARDING] = cnf->forwarding; 5492 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 5493 array[DEVCONF_MTU6] = cnf->mtu6; 5494 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 5495 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 5496 array[DEVCONF_AUTOCONF] = cnf->autoconf; 5497 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 5498 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 5499 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5500 jiffies_to_msecs(cnf->rtr_solicit_interval); 5501 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5502 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 5503 array[DEVCONF_RTR_SOLICIT_DELAY] = 5504 jiffies_to_msecs(cnf->rtr_solicit_delay); 5505 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 5506 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5507 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 5508 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5509 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 5510 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 5511 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 5512 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 5513 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 5514 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 5515 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 5516 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 5517 array[DEVCONF_RA_DEFRTR_METRIC] = cnf->ra_defrtr_metric; 5518 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 5519 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 5520 #ifdef CONFIG_IPV6_ROUTER_PREF 5521 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 5522 array[DEVCONF_RTR_PROBE_INTERVAL] = 5523 jiffies_to_msecs(cnf->rtr_probe_interval); 5524 #ifdef CONFIG_IPV6_ROUTE_INFO 5525 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen; 5526 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 5527 #endif 5528 #endif 5529 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 5530 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 5531 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5532 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 5533 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 5534 #endif 5535 #ifdef CONFIG_IPV6_MROUTE 5536 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 5537 #endif 5538 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 5539 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 5540 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 5541 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 5542 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 5543 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 5544 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 5545 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 5546 /* we omit DEVCONF_STABLE_SECRET for now */ 5547 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 5548 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 5549 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 5550 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5551 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5552 #ifdef CONFIG_IPV6_SEG6_HMAC 5553 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5554 #endif 5555 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5556 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5557 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy; 5558 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass; 5559 array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled; 5560 array[DEVCONF_IOAM6_ENABLED] = cnf->ioam6_enabled; 5561 array[DEVCONF_IOAM6_ID] = cnf->ioam6_id; 5562 array[DEVCONF_IOAM6_ID_WIDE] = cnf->ioam6_id_wide; 5563 array[DEVCONF_NDISC_EVICT_NOCARRIER] = cnf->ndisc_evict_nocarrier; 5564 } 5565 5566 static inline size_t inet6_ifla6_size(void) 5567 { 5568 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5569 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5570 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5571 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5572 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5573 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */ 5574 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */ 5575 + nla_total_size(4) /* IFLA_INET6_RA_MTU */ 5576 + 0; 5577 } 5578 5579 static inline size_t inet6_if_nlmsg_size(void) 5580 { 5581 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5582 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5583 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5584 + nla_total_size(4) /* IFLA_MTU */ 5585 + nla_total_size(4) /* IFLA_LINK */ 5586 + nla_total_size(1) /* IFLA_OPERSTATE */ 5587 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5588 } 5589 5590 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5591 int bytes) 5592 { 5593 int i; 5594 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5595 BUG_ON(pad < 0); 5596 5597 /* Use put_unaligned() because stats may not be aligned for u64. */ 5598 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5599 for (i = 1; i < ICMP6_MIB_MAX; i++) 5600 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5601 5602 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5603 } 5604 5605 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5606 int bytes, size_t syncpoff) 5607 { 5608 int i, c; 5609 u64 buff[IPSTATS_MIB_MAX]; 5610 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5611 5612 BUG_ON(pad < 0); 5613 5614 memset(buff, 0, sizeof(buff)); 5615 buff[0] = IPSTATS_MIB_MAX; 5616 5617 for_each_possible_cpu(c) { 5618 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5619 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5620 } 5621 5622 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5623 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5624 } 5625 5626 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5627 int bytes) 5628 { 5629 switch (attrtype) { 5630 case IFLA_INET6_STATS: 5631 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5632 offsetof(struct ipstats_mib, syncp)); 5633 break; 5634 case IFLA_INET6_ICMP6STATS: 5635 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5636 break; 5637 } 5638 } 5639 5640 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5641 u32 ext_filter_mask) 5642 { 5643 struct nlattr *nla; 5644 struct ifla_cacheinfo ci; 5645 5646 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5647 goto nla_put_failure; 5648 ci.max_reasm_len = IPV6_MAXPLEN; 5649 ci.tstamp = cstamp_delta(idev->tstamp); 5650 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5651 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5652 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5653 goto nla_put_failure; 5654 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5655 if (!nla) 5656 goto nla_put_failure; 5657 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5658 5659 /* XXX - MC not implemented */ 5660 5661 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5662 return 0; 5663 5664 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5665 if (!nla) 5666 goto nla_put_failure; 5667 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5668 5669 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5670 if (!nla) 5671 goto nla_put_failure; 5672 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5673 5674 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5675 if (!nla) 5676 goto nla_put_failure; 5677 read_lock_bh(&idev->lock); 5678 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5679 read_unlock_bh(&idev->lock); 5680 5681 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5682 goto nla_put_failure; 5683 5684 if (idev->ra_mtu && 5685 nla_put_u32(skb, IFLA_INET6_RA_MTU, idev->ra_mtu)) 5686 goto nla_put_failure; 5687 5688 return 0; 5689 5690 nla_put_failure: 5691 return -EMSGSIZE; 5692 } 5693 5694 static size_t inet6_get_link_af_size(const struct net_device *dev, 5695 u32 ext_filter_mask) 5696 { 5697 if (!__in6_dev_get(dev)) 5698 return 0; 5699 5700 return inet6_ifla6_size(); 5701 } 5702 5703 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5704 u32 ext_filter_mask) 5705 { 5706 struct inet6_dev *idev = __in6_dev_get(dev); 5707 5708 if (!idev) 5709 return -ENODATA; 5710 5711 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5712 return -EMSGSIZE; 5713 5714 return 0; 5715 } 5716 5717 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token, 5718 struct netlink_ext_ack *extack) 5719 { 5720 struct inet6_ifaddr *ifp; 5721 struct net_device *dev = idev->dev; 5722 bool clear_token, update_rs = false; 5723 struct in6_addr ll_addr; 5724 5725 ASSERT_RTNL(); 5726 5727 if (!token) 5728 return -EINVAL; 5729 5730 if (dev->flags & IFF_LOOPBACK) { 5731 NL_SET_ERR_MSG_MOD(extack, "Device is loopback"); 5732 return -EINVAL; 5733 } 5734 5735 if (dev->flags & IFF_NOARP) { 5736 NL_SET_ERR_MSG_MOD(extack, 5737 "Device does not do neighbour discovery"); 5738 return -EINVAL; 5739 } 5740 5741 if (!ipv6_accept_ra(idev)) { 5742 NL_SET_ERR_MSG_MOD(extack, 5743 "Router advertisement is disabled on device"); 5744 return -EINVAL; 5745 } 5746 5747 if (idev->cnf.rtr_solicits == 0) { 5748 NL_SET_ERR_MSG(extack, 5749 "Router solicitation is disabled on device"); 5750 return -EINVAL; 5751 } 5752 5753 write_lock_bh(&idev->lock); 5754 5755 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5756 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5757 5758 write_unlock_bh(&idev->lock); 5759 5760 clear_token = ipv6_addr_any(token); 5761 if (clear_token) 5762 goto update_lft; 5763 5764 if (!idev->dead && (idev->if_flags & IF_READY) && 5765 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5766 IFA_F_OPTIMISTIC)) { 5767 /* If we're not ready, then normal ifup will take care 5768 * of this. Otherwise, we need to request our rs here. 5769 */ 5770 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5771 update_rs = true; 5772 } 5773 5774 update_lft: 5775 write_lock_bh(&idev->lock); 5776 5777 if (update_rs) { 5778 idev->if_flags |= IF_RS_SENT; 5779 idev->rs_interval = rfc3315_s14_backoff_init( 5780 idev->cnf.rtr_solicit_interval); 5781 idev->rs_probes = 1; 5782 addrconf_mod_rs_timer(idev, idev->rs_interval); 5783 } 5784 5785 /* Well, that's kinda nasty ... */ 5786 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5787 spin_lock(&ifp->lock); 5788 if (ifp->tokenized) { 5789 ifp->valid_lft = 0; 5790 ifp->prefered_lft = 0; 5791 } 5792 spin_unlock(&ifp->lock); 5793 } 5794 5795 write_unlock_bh(&idev->lock); 5796 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5797 addrconf_verify_rtnl(); 5798 return 0; 5799 } 5800 5801 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5802 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5803 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5804 [IFLA_INET6_RA_MTU] = { .type = NLA_REJECT, 5805 .reject_message = 5806 "IFLA_INET6_RA_MTU can not be set" }, 5807 }; 5808 5809 static int check_addr_gen_mode(int mode) 5810 { 5811 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5812 mode != IN6_ADDR_GEN_MODE_NONE && 5813 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5814 mode != IN6_ADDR_GEN_MODE_RANDOM) 5815 return -EINVAL; 5816 return 1; 5817 } 5818 5819 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5820 int mode) 5821 { 5822 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5823 !idev->cnf.stable_secret.initialized && 5824 !net->ipv6.devconf_dflt->stable_secret.initialized) 5825 return -EINVAL; 5826 return 1; 5827 } 5828 5829 static int inet6_validate_link_af(const struct net_device *dev, 5830 const struct nlattr *nla, 5831 struct netlink_ext_ack *extack) 5832 { 5833 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5834 struct inet6_dev *idev = NULL; 5835 int err; 5836 5837 if (dev) { 5838 idev = __in6_dev_get(dev); 5839 if (!idev) 5840 return -EAFNOSUPPORT; 5841 } 5842 5843 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, 5844 inet6_af_policy, extack); 5845 if (err) 5846 return err; 5847 5848 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE]) 5849 return -EINVAL; 5850 5851 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5852 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5853 5854 if (check_addr_gen_mode(mode) < 0) 5855 return -EINVAL; 5856 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0) 5857 return -EINVAL; 5858 } 5859 5860 return 0; 5861 } 5862 5863 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla, 5864 struct netlink_ext_ack *extack) 5865 { 5866 struct inet6_dev *idev = __in6_dev_get(dev); 5867 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5868 int err; 5869 5870 if (!idev) 5871 return -EAFNOSUPPORT; 5872 5873 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 5874 return -EINVAL; 5875 5876 if (tb[IFLA_INET6_TOKEN]) { 5877 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]), 5878 extack); 5879 if (err) 5880 return err; 5881 } 5882 5883 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5884 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5885 5886 idev->cnf.addr_gen_mode = mode; 5887 } 5888 5889 return 0; 5890 } 5891 5892 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5893 u32 portid, u32 seq, int event, unsigned int flags) 5894 { 5895 struct net_device *dev = idev->dev; 5896 struct ifinfomsg *hdr; 5897 struct nlmsghdr *nlh; 5898 void *protoinfo; 5899 5900 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5901 if (!nlh) 5902 return -EMSGSIZE; 5903 5904 hdr = nlmsg_data(nlh); 5905 hdr->ifi_family = AF_INET6; 5906 hdr->__ifi_pad = 0; 5907 hdr->ifi_type = dev->type; 5908 hdr->ifi_index = dev->ifindex; 5909 hdr->ifi_flags = dev_get_flags(dev); 5910 hdr->ifi_change = 0; 5911 5912 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5913 (dev->addr_len && 5914 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5915 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5916 (dev->ifindex != dev_get_iflink(dev) && 5917 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5918 nla_put_u8(skb, IFLA_OPERSTATE, 5919 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5920 goto nla_put_failure; 5921 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO); 5922 if (!protoinfo) 5923 goto nla_put_failure; 5924 5925 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5926 goto nla_put_failure; 5927 5928 nla_nest_end(skb, protoinfo); 5929 nlmsg_end(skb, nlh); 5930 return 0; 5931 5932 nla_put_failure: 5933 nlmsg_cancel(skb, nlh); 5934 return -EMSGSIZE; 5935 } 5936 5937 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh, 5938 struct netlink_ext_ack *extack) 5939 { 5940 struct ifinfomsg *ifm; 5941 5942 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5943 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request"); 5944 return -EINVAL; 5945 } 5946 5947 if (nlmsg_attrlen(nlh, sizeof(*ifm))) { 5948 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header"); 5949 return -EINVAL; 5950 } 5951 5952 ifm = nlmsg_data(nlh); 5953 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || 5954 ifm->ifi_change || ifm->ifi_index) { 5955 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request"); 5956 return -EINVAL; 5957 } 5958 5959 return 0; 5960 } 5961 5962 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5963 { 5964 struct net *net = sock_net(skb->sk); 5965 int h, s_h; 5966 int idx = 0, s_idx; 5967 struct net_device *dev; 5968 struct inet6_dev *idev; 5969 struct hlist_head *head; 5970 5971 /* only requests using strict checking can pass data to 5972 * influence the dump 5973 */ 5974 if (cb->strict_check) { 5975 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack); 5976 5977 if (err < 0) 5978 return err; 5979 } 5980 5981 s_h = cb->args[0]; 5982 s_idx = cb->args[1]; 5983 5984 rcu_read_lock(); 5985 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5986 idx = 0; 5987 head = &net->dev_index_head[h]; 5988 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5989 if (idx < s_idx) 5990 goto cont; 5991 idev = __in6_dev_get(dev); 5992 if (!idev) 5993 goto cont; 5994 if (inet6_fill_ifinfo(skb, idev, 5995 NETLINK_CB(cb->skb).portid, 5996 cb->nlh->nlmsg_seq, 5997 RTM_NEWLINK, NLM_F_MULTI) < 0) 5998 goto out; 5999 cont: 6000 idx++; 6001 } 6002 } 6003 out: 6004 rcu_read_unlock(); 6005 cb->args[1] = idx; 6006 cb->args[0] = h; 6007 6008 return skb->len; 6009 } 6010 6011 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 6012 { 6013 struct sk_buff *skb; 6014 struct net *net = dev_net(idev->dev); 6015 int err = -ENOBUFS; 6016 6017 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 6018 if (!skb) 6019 goto errout; 6020 6021 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 6022 if (err < 0) { 6023 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 6024 WARN_ON(err == -EMSGSIZE); 6025 kfree_skb(skb); 6026 goto errout; 6027 } 6028 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 6029 return; 6030 errout: 6031 if (err < 0) 6032 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 6033 } 6034 6035 static inline size_t inet6_prefix_nlmsg_size(void) 6036 { 6037 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 6038 + nla_total_size(sizeof(struct in6_addr)) 6039 + nla_total_size(sizeof(struct prefix_cacheinfo)); 6040 } 6041 6042 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 6043 struct prefix_info *pinfo, u32 portid, u32 seq, 6044 int event, unsigned int flags) 6045 { 6046 struct prefixmsg *pmsg; 6047 struct nlmsghdr *nlh; 6048 struct prefix_cacheinfo ci; 6049 6050 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 6051 if (!nlh) 6052 return -EMSGSIZE; 6053 6054 pmsg = nlmsg_data(nlh); 6055 pmsg->prefix_family = AF_INET6; 6056 pmsg->prefix_pad1 = 0; 6057 pmsg->prefix_pad2 = 0; 6058 pmsg->prefix_ifindex = idev->dev->ifindex; 6059 pmsg->prefix_len = pinfo->prefix_len; 6060 pmsg->prefix_type = pinfo->type; 6061 pmsg->prefix_pad3 = 0; 6062 pmsg->prefix_flags = 0; 6063 if (pinfo->onlink) 6064 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 6065 if (pinfo->autoconf) 6066 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 6067 6068 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 6069 goto nla_put_failure; 6070 ci.preferred_time = ntohl(pinfo->prefered); 6071 ci.valid_time = ntohl(pinfo->valid); 6072 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 6073 goto nla_put_failure; 6074 nlmsg_end(skb, nlh); 6075 return 0; 6076 6077 nla_put_failure: 6078 nlmsg_cancel(skb, nlh); 6079 return -EMSGSIZE; 6080 } 6081 6082 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 6083 struct prefix_info *pinfo) 6084 { 6085 struct sk_buff *skb; 6086 struct net *net = dev_net(idev->dev); 6087 int err = -ENOBUFS; 6088 6089 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 6090 if (!skb) 6091 goto errout; 6092 6093 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 6094 if (err < 0) { 6095 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 6096 WARN_ON(err == -EMSGSIZE); 6097 kfree_skb(skb); 6098 goto errout; 6099 } 6100 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 6101 return; 6102 errout: 6103 if (err < 0) 6104 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 6105 } 6106 6107 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6108 { 6109 struct net *net = dev_net(ifp->idev->dev); 6110 6111 if (event) 6112 ASSERT_RTNL(); 6113 6114 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 6115 6116 switch (event) { 6117 case RTM_NEWADDR: 6118 /* 6119 * If the address was optimistic we inserted the route at the 6120 * start of our DAD process, so we don't need to do it again. 6121 * If the device was taken down in the middle of the DAD 6122 * cycle there is a race where we could get here without a 6123 * host route, so nothing to insert. That will be fixed when 6124 * the device is brought up. 6125 */ 6126 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) { 6127 ip6_ins_rt(net, ifp->rt); 6128 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) { 6129 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n", 6130 &ifp->addr, ifp->idev->dev->name); 6131 } 6132 6133 if (ifp->idev->cnf.forwarding) 6134 addrconf_join_anycast(ifp); 6135 if (!ipv6_addr_any(&ifp->peer_addr)) 6136 addrconf_prefix_route(&ifp->peer_addr, 128, 6137 ifp->rt_priority, ifp->idev->dev, 6138 0, 0, GFP_ATOMIC); 6139 break; 6140 case RTM_DELADDR: 6141 if (ifp->idev->cnf.forwarding) 6142 addrconf_leave_anycast(ifp); 6143 addrconf_leave_solict(ifp->idev, &ifp->addr); 6144 if (!ipv6_addr_any(&ifp->peer_addr)) { 6145 struct fib6_info *rt; 6146 6147 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 6148 ifp->idev->dev, 0, 0, 6149 false); 6150 if (rt) 6151 ip6_del_rt(net, rt, false); 6152 } 6153 if (ifp->rt) { 6154 ip6_del_rt(net, ifp->rt, false); 6155 ifp->rt = NULL; 6156 } 6157 rt_genid_bump_ipv6(net); 6158 break; 6159 } 6160 atomic_inc(&net->ipv6.dev_addr_genid); 6161 } 6162 6163 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6164 { 6165 if (likely(ifp->idev->dead == 0)) 6166 __ipv6_ifa_notify(event, ifp); 6167 } 6168 6169 #ifdef CONFIG_SYSCTL 6170 6171 static int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 6172 void *buffer, size_t *lenp, loff_t *ppos) 6173 { 6174 int *valp = ctl->data; 6175 int val = *valp; 6176 loff_t pos = *ppos; 6177 struct ctl_table lctl; 6178 int ret; 6179 6180 /* 6181 * ctl->data points to idev->cnf.forwarding, we should 6182 * not modify it until we get the rtnl lock. 6183 */ 6184 lctl = *ctl; 6185 lctl.data = &val; 6186 6187 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6188 6189 if (write) 6190 ret = addrconf_fixup_forwarding(ctl, valp, val); 6191 if (ret) 6192 *ppos = pos; 6193 return ret; 6194 } 6195 6196 static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 6197 void *buffer, size_t *lenp, loff_t *ppos) 6198 { 6199 struct inet6_dev *idev = ctl->extra1; 6200 int min_mtu = IPV6_MIN_MTU; 6201 struct ctl_table lctl; 6202 6203 lctl = *ctl; 6204 lctl.extra1 = &min_mtu; 6205 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 6206 6207 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 6208 } 6209 6210 static void dev_disable_change(struct inet6_dev *idev) 6211 { 6212 struct netdev_notifier_info info; 6213 6214 if (!idev || !idev->dev) 6215 return; 6216 6217 netdev_notifier_info_init(&info, idev->dev); 6218 if (idev->cnf.disable_ipv6) 6219 addrconf_notify(NULL, NETDEV_DOWN, &info); 6220 else 6221 addrconf_notify(NULL, NETDEV_UP, &info); 6222 } 6223 6224 static void addrconf_disable_change(struct net *net, __s32 newf) 6225 { 6226 struct net_device *dev; 6227 struct inet6_dev *idev; 6228 6229 for_each_netdev(net, dev) { 6230 idev = __in6_dev_get(dev); 6231 if (idev) { 6232 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 6233 idev->cnf.disable_ipv6 = newf; 6234 if (changed) 6235 dev_disable_change(idev); 6236 } 6237 } 6238 } 6239 6240 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 6241 { 6242 struct net *net; 6243 int old; 6244 6245 if (!rtnl_trylock()) 6246 return restart_syscall(); 6247 6248 net = (struct net *)table->extra2; 6249 old = *p; 6250 *p = newf; 6251 6252 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 6253 rtnl_unlock(); 6254 return 0; 6255 } 6256 6257 if (p == &net->ipv6.devconf_all->disable_ipv6) { 6258 net->ipv6.devconf_dflt->disable_ipv6 = newf; 6259 addrconf_disable_change(net, newf); 6260 } else if ((!newf) ^ (!old)) 6261 dev_disable_change((struct inet6_dev *)table->extra1); 6262 6263 rtnl_unlock(); 6264 return 0; 6265 } 6266 6267 static int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 6268 void *buffer, size_t *lenp, loff_t *ppos) 6269 { 6270 int *valp = ctl->data; 6271 int val = *valp; 6272 loff_t pos = *ppos; 6273 struct ctl_table lctl; 6274 int ret; 6275 6276 /* 6277 * ctl->data points to idev->cnf.disable_ipv6, we should 6278 * not modify it until we get the rtnl lock. 6279 */ 6280 lctl = *ctl; 6281 lctl.data = &val; 6282 6283 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6284 6285 if (write) 6286 ret = addrconf_disable_ipv6(ctl, valp, val); 6287 if (ret) 6288 *ppos = pos; 6289 return ret; 6290 } 6291 6292 static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 6293 void *buffer, size_t *lenp, loff_t *ppos) 6294 { 6295 int *valp = ctl->data; 6296 int ret; 6297 int old, new; 6298 6299 old = *valp; 6300 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 6301 new = *valp; 6302 6303 if (write && old != new) { 6304 struct net *net = ctl->extra2; 6305 6306 if (!rtnl_trylock()) 6307 return restart_syscall(); 6308 6309 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 6310 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6311 NETCONFA_PROXY_NEIGH, 6312 NETCONFA_IFINDEX_DEFAULT, 6313 net->ipv6.devconf_dflt); 6314 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 6315 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6316 NETCONFA_PROXY_NEIGH, 6317 NETCONFA_IFINDEX_ALL, 6318 net->ipv6.devconf_all); 6319 else { 6320 struct inet6_dev *idev = ctl->extra1; 6321 6322 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6323 NETCONFA_PROXY_NEIGH, 6324 idev->dev->ifindex, 6325 &idev->cnf); 6326 } 6327 rtnl_unlock(); 6328 } 6329 6330 return ret; 6331 } 6332 6333 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 6334 void *buffer, size_t *lenp, 6335 loff_t *ppos) 6336 { 6337 int ret = 0; 6338 u32 new_val; 6339 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 6340 struct net *net = (struct net *)ctl->extra2; 6341 struct ctl_table tmp = { 6342 .data = &new_val, 6343 .maxlen = sizeof(new_val), 6344 .mode = ctl->mode, 6345 }; 6346 6347 if (!rtnl_trylock()) 6348 return restart_syscall(); 6349 6350 new_val = *((u32 *)ctl->data); 6351 6352 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos); 6353 if (ret != 0) 6354 goto out; 6355 6356 if (write) { 6357 if (check_addr_gen_mode(new_val) < 0) { 6358 ret = -EINVAL; 6359 goto out; 6360 } 6361 6362 if (idev) { 6363 if (check_stable_privacy(idev, net, new_val) < 0) { 6364 ret = -EINVAL; 6365 goto out; 6366 } 6367 6368 if (idev->cnf.addr_gen_mode != new_val) { 6369 idev->cnf.addr_gen_mode = new_val; 6370 addrconf_dev_config(idev->dev); 6371 } 6372 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) { 6373 struct net_device *dev; 6374 6375 net->ipv6.devconf_dflt->addr_gen_mode = new_val; 6376 for_each_netdev(net, dev) { 6377 idev = __in6_dev_get(dev); 6378 if (idev && 6379 idev->cnf.addr_gen_mode != new_val) { 6380 idev->cnf.addr_gen_mode = new_val; 6381 addrconf_dev_config(idev->dev); 6382 } 6383 } 6384 } 6385 6386 *((u32 *)ctl->data) = new_val; 6387 } 6388 6389 out: 6390 rtnl_unlock(); 6391 6392 return ret; 6393 } 6394 6395 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 6396 void *buffer, size_t *lenp, 6397 loff_t *ppos) 6398 { 6399 int err; 6400 struct in6_addr addr; 6401 char str[IPV6_MAX_STRLEN]; 6402 struct ctl_table lctl = *ctl; 6403 struct net *net = ctl->extra2; 6404 struct ipv6_stable_secret *secret = ctl->data; 6405 6406 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 6407 return -EIO; 6408 6409 lctl.maxlen = IPV6_MAX_STRLEN; 6410 lctl.data = str; 6411 6412 if (!rtnl_trylock()) 6413 return restart_syscall(); 6414 6415 if (!write && !secret->initialized) { 6416 err = -EIO; 6417 goto out; 6418 } 6419 6420 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 6421 if (err >= sizeof(str)) { 6422 err = -EIO; 6423 goto out; 6424 } 6425 6426 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 6427 if (err || !write) 6428 goto out; 6429 6430 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 6431 err = -EIO; 6432 goto out; 6433 } 6434 6435 secret->initialized = true; 6436 secret->secret = addr; 6437 6438 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 6439 struct net_device *dev; 6440 6441 for_each_netdev(net, dev) { 6442 struct inet6_dev *idev = __in6_dev_get(dev); 6443 6444 if (idev) { 6445 idev->cnf.addr_gen_mode = 6446 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6447 } 6448 } 6449 } else { 6450 struct inet6_dev *idev = ctl->extra1; 6451 6452 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6453 } 6454 6455 out: 6456 rtnl_unlock(); 6457 6458 return err; 6459 } 6460 6461 static 6462 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 6463 int write, void *buffer, 6464 size_t *lenp, 6465 loff_t *ppos) 6466 { 6467 int *valp = ctl->data; 6468 int val = *valp; 6469 loff_t pos = *ppos; 6470 struct ctl_table lctl; 6471 int ret; 6472 6473 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 6474 * we should not modify it until we get the rtnl lock. 6475 */ 6476 lctl = *ctl; 6477 lctl.data = &val; 6478 6479 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6480 6481 if (write) 6482 ret = addrconf_fixup_linkdown(ctl, valp, val); 6483 if (ret) 6484 *ppos = pos; 6485 return ret; 6486 } 6487 6488 static 6489 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 6490 { 6491 if (rt) { 6492 if (action) 6493 rt->dst.flags |= DST_NOPOLICY; 6494 else 6495 rt->dst.flags &= ~DST_NOPOLICY; 6496 } 6497 } 6498 6499 static 6500 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 6501 { 6502 struct inet6_ifaddr *ifa; 6503 6504 read_lock_bh(&idev->lock); 6505 list_for_each_entry(ifa, &idev->addr_list, if_list) { 6506 spin_lock(&ifa->lock); 6507 if (ifa->rt) { 6508 /* host routes only use builtin fib6_nh */ 6509 struct fib6_nh *nh = ifa->rt->fib6_nh; 6510 int cpu; 6511 6512 rcu_read_lock(); 6513 ifa->rt->dst_nopolicy = val ? true : false; 6514 if (nh->rt6i_pcpu) { 6515 for_each_possible_cpu(cpu) { 6516 struct rt6_info **rtp; 6517 6518 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu); 6519 addrconf_set_nopolicy(*rtp, val); 6520 } 6521 } 6522 rcu_read_unlock(); 6523 } 6524 spin_unlock(&ifa->lock); 6525 } 6526 read_unlock_bh(&idev->lock); 6527 } 6528 6529 static 6530 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 6531 { 6532 struct inet6_dev *idev; 6533 struct net *net; 6534 6535 if (!rtnl_trylock()) 6536 return restart_syscall(); 6537 6538 *valp = val; 6539 6540 net = (struct net *)ctl->extra2; 6541 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 6542 rtnl_unlock(); 6543 return 0; 6544 } 6545 6546 if (valp == &net->ipv6.devconf_all->disable_policy) { 6547 struct net_device *dev; 6548 6549 for_each_netdev(net, dev) { 6550 idev = __in6_dev_get(dev); 6551 if (idev) 6552 addrconf_disable_policy_idev(idev, val); 6553 } 6554 } else { 6555 idev = (struct inet6_dev *)ctl->extra1; 6556 addrconf_disable_policy_idev(idev, val); 6557 } 6558 6559 rtnl_unlock(); 6560 return 0; 6561 } 6562 6563 static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 6564 void *buffer, size_t *lenp, loff_t *ppos) 6565 { 6566 int *valp = ctl->data; 6567 int val = *valp; 6568 loff_t pos = *ppos; 6569 struct ctl_table lctl; 6570 int ret; 6571 6572 lctl = *ctl; 6573 lctl.data = &val; 6574 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6575 6576 if (write && (*valp != val)) 6577 ret = addrconf_disable_policy(ctl, valp, val); 6578 6579 if (ret) 6580 *ppos = pos; 6581 6582 return ret; 6583 } 6584 6585 static int minus_one = -1; 6586 static const int two_five_five = 255; 6587 static u32 ioam6_if_id_max = U16_MAX; 6588 6589 static const struct ctl_table addrconf_sysctl[] = { 6590 { 6591 .procname = "forwarding", 6592 .data = &ipv6_devconf.forwarding, 6593 .maxlen = sizeof(int), 6594 .mode = 0644, 6595 .proc_handler = addrconf_sysctl_forward, 6596 }, 6597 { 6598 .procname = "hop_limit", 6599 .data = &ipv6_devconf.hop_limit, 6600 .maxlen = sizeof(int), 6601 .mode = 0644, 6602 .proc_handler = proc_dointvec_minmax, 6603 .extra1 = (void *)SYSCTL_ONE, 6604 .extra2 = (void *)&two_five_five, 6605 }, 6606 { 6607 .procname = "mtu", 6608 .data = &ipv6_devconf.mtu6, 6609 .maxlen = sizeof(int), 6610 .mode = 0644, 6611 .proc_handler = addrconf_sysctl_mtu, 6612 }, 6613 { 6614 .procname = "accept_ra", 6615 .data = &ipv6_devconf.accept_ra, 6616 .maxlen = sizeof(int), 6617 .mode = 0644, 6618 .proc_handler = proc_dointvec, 6619 }, 6620 { 6621 .procname = "accept_redirects", 6622 .data = &ipv6_devconf.accept_redirects, 6623 .maxlen = sizeof(int), 6624 .mode = 0644, 6625 .proc_handler = proc_dointvec, 6626 }, 6627 { 6628 .procname = "autoconf", 6629 .data = &ipv6_devconf.autoconf, 6630 .maxlen = sizeof(int), 6631 .mode = 0644, 6632 .proc_handler = proc_dointvec, 6633 }, 6634 { 6635 .procname = "dad_transmits", 6636 .data = &ipv6_devconf.dad_transmits, 6637 .maxlen = sizeof(int), 6638 .mode = 0644, 6639 .proc_handler = proc_dointvec, 6640 }, 6641 { 6642 .procname = "router_solicitations", 6643 .data = &ipv6_devconf.rtr_solicits, 6644 .maxlen = sizeof(int), 6645 .mode = 0644, 6646 .proc_handler = proc_dointvec_minmax, 6647 .extra1 = &minus_one, 6648 }, 6649 { 6650 .procname = "router_solicitation_interval", 6651 .data = &ipv6_devconf.rtr_solicit_interval, 6652 .maxlen = sizeof(int), 6653 .mode = 0644, 6654 .proc_handler = proc_dointvec_jiffies, 6655 }, 6656 { 6657 .procname = "router_solicitation_max_interval", 6658 .data = &ipv6_devconf.rtr_solicit_max_interval, 6659 .maxlen = sizeof(int), 6660 .mode = 0644, 6661 .proc_handler = proc_dointvec_jiffies, 6662 }, 6663 { 6664 .procname = "router_solicitation_delay", 6665 .data = &ipv6_devconf.rtr_solicit_delay, 6666 .maxlen = sizeof(int), 6667 .mode = 0644, 6668 .proc_handler = proc_dointvec_jiffies, 6669 }, 6670 { 6671 .procname = "force_mld_version", 6672 .data = &ipv6_devconf.force_mld_version, 6673 .maxlen = sizeof(int), 6674 .mode = 0644, 6675 .proc_handler = proc_dointvec, 6676 }, 6677 { 6678 .procname = "mldv1_unsolicited_report_interval", 6679 .data = 6680 &ipv6_devconf.mldv1_unsolicited_report_interval, 6681 .maxlen = sizeof(int), 6682 .mode = 0644, 6683 .proc_handler = proc_dointvec_ms_jiffies, 6684 }, 6685 { 6686 .procname = "mldv2_unsolicited_report_interval", 6687 .data = 6688 &ipv6_devconf.mldv2_unsolicited_report_interval, 6689 .maxlen = sizeof(int), 6690 .mode = 0644, 6691 .proc_handler = proc_dointvec_ms_jiffies, 6692 }, 6693 { 6694 .procname = "use_tempaddr", 6695 .data = &ipv6_devconf.use_tempaddr, 6696 .maxlen = sizeof(int), 6697 .mode = 0644, 6698 .proc_handler = proc_dointvec, 6699 }, 6700 { 6701 .procname = "temp_valid_lft", 6702 .data = &ipv6_devconf.temp_valid_lft, 6703 .maxlen = sizeof(int), 6704 .mode = 0644, 6705 .proc_handler = proc_dointvec, 6706 }, 6707 { 6708 .procname = "temp_prefered_lft", 6709 .data = &ipv6_devconf.temp_prefered_lft, 6710 .maxlen = sizeof(int), 6711 .mode = 0644, 6712 .proc_handler = proc_dointvec, 6713 }, 6714 { 6715 .procname = "regen_max_retry", 6716 .data = &ipv6_devconf.regen_max_retry, 6717 .maxlen = sizeof(int), 6718 .mode = 0644, 6719 .proc_handler = proc_dointvec, 6720 }, 6721 { 6722 .procname = "max_desync_factor", 6723 .data = &ipv6_devconf.max_desync_factor, 6724 .maxlen = sizeof(int), 6725 .mode = 0644, 6726 .proc_handler = proc_dointvec, 6727 }, 6728 { 6729 .procname = "max_addresses", 6730 .data = &ipv6_devconf.max_addresses, 6731 .maxlen = sizeof(int), 6732 .mode = 0644, 6733 .proc_handler = proc_dointvec, 6734 }, 6735 { 6736 .procname = "accept_ra_defrtr", 6737 .data = &ipv6_devconf.accept_ra_defrtr, 6738 .maxlen = sizeof(int), 6739 .mode = 0644, 6740 .proc_handler = proc_dointvec, 6741 }, 6742 { 6743 .procname = "ra_defrtr_metric", 6744 .data = &ipv6_devconf.ra_defrtr_metric, 6745 .maxlen = sizeof(u32), 6746 .mode = 0644, 6747 .proc_handler = proc_douintvec_minmax, 6748 .extra1 = (void *)SYSCTL_ONE, 6749 }, 6750 { 6751 .procname = "accept_ra_min_hop_limit", 6752 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6753 .maxlen = sizeof(int), 6754 .mode = 0644, 6755 .proc_handler = proc_dointvec, 6756 }, 6757 { 6758 .procname = "accept_ra_pinfo", 6759 .data = &ipv6_devconf.accept_ra_pinfo, 6760 .maxlen = sizeof(int), 6761 .mode = 0644, 6762 .proc_handler = proc_dointvec, 6763 }, 6764 #ifdef CONFIG_IPV6_ROUTER_PREF 6765 { 6766 .procname = "accept_ra_rtr_pref", 6767 .data = &ipv6_devconf.accept_ra_rtr_pref, 6768 .maxlen = sizeof(int), 6769 .mode = 0644, 6770 .proc_handler = proc_dointvec, 6771 }, 6772 { 6773 .procname = "router_probe_interval", 6774 .data = &ipv6_devconf.rtr_probe_interval, 6775 .maxlen = sizeof(int), 6776 .mode = 0644, 6777 .proc_handler = proc_dointvec_jiffies, 6778 }, 6779 #ifdef CONFIG_IPV6_ROUTE_INFO 6780 { 6781 .procname = "accept_ra_rt_info_min_plen", 6782 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6783 .maxlen = sizeof(int), 6784 .mode = 0644, 6785 .proc_handler = proc_dointvec, 6786 }, 6787 { 6788 .procname = "accept_ra_rt_info_max_plen", 6789 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6790 .maxlen = sizeof(int), 6791 .mode = 0644, 6792 .proc_handler = proc_dointvec, 6793 }, 6794 #endif 6795 #endif 6796 { 6797 .procname = "proxy_ndp", 6798 .data = &ipv6_devconf.proxy_ndp, 6799 .maxlen = sizeof(int), 6800 .mode = 0644, 6801 .proc_handler = addrconf_sysctl_proxy_ndp, 6802 }, 6803 { 6804 .procname = "accept_source_route", 6805 .data = &ipv6_devconf.accept_source_route, 6806 .maxlen = sizeof(int), 6807 .mode = 0644, 6808 .proc_handler = proc_dointvec, 6809 }, 6810 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6811 { 6812 .procname = "optimistic_dad", 6813 .data = &ipv6_devconf.optimistic_dad, 6814 .maxlen = sizeof(int), 6815 .mode = 0644, 6816 .proc_handler = proc_dointvec, 6817 }, 6818 { 6819 .procname = "use_optimistic", 6820 .data = &ipv6_devconf.use_optimistic, 6821 .maxlen = sizeof(int), 6822 .mode = 0644, 6823 .proc_handler = proc_dointvec, 6824 }, 6825 #endif 6826 #ifdef CONFIG_IPV6_MROUTE 6827 { 6828 .procname = "mc_forwarding", 6829 .data = &ipv6_devconf.mc_forwarding, 6830 .maxlen = sizeof(int), 6831 .mode = 0444, 6832 .proc_handler = proc_dointvec, 6833 }, 6834 #endif 6835 { 6836 .procname = "disable_ipv6", 6837 .data = &ipv6_devconf.disable_ipv6, 6838 .maxlen = sizeof(int), 6839 .mode = 0644, 6840 .proc_handler = addrconf_sysctl_disable, 6841 }, 6842 { 6843 .procname = "accept_dad", 6844 .data = &ipv6_devconf.accept_dad, 6845 .maxlen = sizeof(int), 6846 .mode = 0644, 6847 .proc_handler = proc_dointvec, 6848 }, 6849 { 6850 .procname = "force_tllao", 6851 .data = &ipv6_devconf.force_tllao, 6852 .maxlen = sizeof(int), 6853 .mode = 0644, 6854 .proc_handler = proc_dointvec 6855 }, 6856 { 6857 .procname = "ndisc_notify", 6858 .data = &ipv6_devconf.ndisc_notify, 6859 .maxlen = sizeof(int), 6860 .mode = 0644, 6861 .proc_handler = proc_dointvec 6862 }, 6863 { 6864 .procname = "suppress_frag_ndisc", 6865 .data = &ipv6_devconf.suppress_frag_ndisc, 6866 .maxlen = sizeof(int), 6867 .mode = 0644, 6868 .proc_handler = proc_dointvec 6869 }, 6870 { 6871 .procname = "accept_ra_from_local", 6872 .data = &ipv6_devconf.accept_ra_from_local, 6873 .maxlen = sizeof(int), 6874 .mode = 0644, 6875 .proc_handler = proc_dointvec, 6876 }, 6877 { 6878 .procname = "accept_ra_mtu", 6879 .data = &ipv6_devconf.accept_ra_mtu, 6880 .maxlen = sizeof(int), 6881 .mode = 0644, 6882 .proc_handler = proc_dointvec, 6883 }, 6884 { 6885 .procname = "stable_secret", 6886 .data = &ipv6_devconf.stable_secret, 6887 .maxlen = IPV6_MAX_STRLEN, 6888 .mode = 0600, 6889 .proc_handler = addrconf_sysctl_stable_secret, 6890 }, 6891 { 6892 .procname = "use_oif_addrs_only", 6893 .data = &ipv6_devconf.use_oif_addrs_only, 6894 .maxlen = sizeof(int), 6895 .mode = 0644, 6896 .proc_handler = proc_dointvec, 6897 }, 6898 { 6899 .procname = "ignore_routes_with_linkdown", 6900 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6901 .maxlen = sizeof(int), 6902 .mode = 0644, 6903 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6904 }, 6905 { 6906 .procname = "drop_unicast_in_l2_multicast", 6907 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6908 .maxlen = sizeof(int), 6909 .mode = 0644, 6910 .proc_handler = proc_dointvec, 6911 }, 6912 { 6913 .procname = "drop_unsolicited_na", 6914 .data = &ipv6_devconf.drop_unsolicited_na, 6915 .maxlen = sizeof(int), 6916 .mode = 0644, 6917 .proc_handler = proc_dointvec, 6918 }, 6919 { 6920 .procname = "keep_addr_on_down", 6921 .data = &ipv6_devconf.keep_addr_on_down, 6922 .maxlen = sizeof(int), 6923 .mode = 0644, 6924 .proc_handler = proc_dointvec, 6925 6926 }, 6927 { 6928 .procname = "seg6_enabled", 6929 .data = &ipv6_devconf.seg6_enabled, 6930 .maxlen = sizeof(int), 6931 .mode = 0644, 6932 .proc_handler = proc_dointvec, 6933 }, 6934 #ifdef CONFIG_IPV6_SEG6_HMAC 6935 { 6936 .procname = "seg6_require_hmac", 6937 .data = &ipv6_devconf.seg6_require_hmac, 6938 .maxlen = sizeof(int), 6939 .mode = 0644, 6940 .proc_handler = proc_dointvec, 6941 }, 6942 #endif 6943 { 6944 .procname = "enhanced_dad", 6945 .data = &ipv6_devconf.enhanced_dad, 6946 .maxlen = sizeof(int), 6947 .mode = 0644, 6948 .proc_handler = proc_dointvec, 6949 }, 6950 { 6951 .procname = "addr_gen_mode", 6952 .data = &ipv6_devconf.addr_gen_mode, 6953 .maxlen = sizeof(int), 6954 .mode = 0644, 6955 .proc_handler = addrconf_sysctl_addr_gen_mode, 6956 }, 6957 { 6958 .procname = "disable_policy", 6959 .data = &ipv6_devconf.disable_policy, 6960 .maxlen = sizeof(int), 6961 .mode = 0644, 6962 .proc_handler = addrconf_sysctl_disable_policy, 6963 }, 6964 { 6965 .procname = "ndisc_tclass", 6966 .data = &ipv6_devconf.ndisc_tclass, 6967 .maxlen = sizeof(int), 6968 .mode = 0644, 6969 .proc_handler = proc_dointvec_minmax, 6970 .extra1 = (void *)SYSCTL_ZERO, 6971 .extra2 = (void *)&two_five_five, 6972 }, 6973 { 6974 .procname = "rpl_seg_enabled", 6975 .data = &ipv6_devconf.rpl_seg_enabled, 6976 .maxlen = sizeof(int), 6977 .mode = 0644, 6978 .proc_handler = proc_dointvec, 6979 }, 6980 { 6981 .procname = "ioam6_enabled", 6982 .data = &ipv6_devconf.ioam6_enabled, 6983 .maxlen = sizeof(u8), 6984 .mode = 0644, 6985 .proc_handler = proc_dou8vec_minmax, 6986 .extra1 = (void *)SYSCTL_ZERO, 6987 .extra2 = (void *)SYSCTL_ONE, 6988 }, 6989 { 6990 .procname = "ioam6_id", 6991 .data = &ipv6_devconf.ioam6_id, 6992 .maxlen = sizeof(u32), 6993 .mode = 0644, 6994 .proc_handler = proc_douintvec_minmax, 6995 .extra1 = (void *)SYSCTL_ZERO, 6996 .extra2 = (void *)&ioam6_if_id_max, 6997 }, 6998 { 6999 .procname = "ioam6_id_wide", 7000 .data = &ipv6_devconf.ioam6_id_wide, 7001 .maxlen = sizeof(u32), 7002 .mode = 0644, 7003 .proc_handler = proc_douintvec, 7004 }, 7005 { 7006 .procname = "ndisc_evict_nocarrier", 7007 .data = &ipv6_devconf.ndisc_evict_nocarrier, 7008 .maxlen = sizeof(u8), 7009 .mode = 0644, 7010 .proc_handler = proc_dou8vec_minmax, 7011 .extra1 = (void *)SYSCTL_ZERO, 7012 .extra2 = (void *)SYSCTL_ONE, 7013 }, 7014 { 7015 /* sentinel */ 7016 } 7017 }; 7018 7019 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 7020 struct inet6_dev *idev, struct ipv6_devconf *p) 7021 { 7022 int i, ifindex; 7023 struct ctl_table *table; 7024 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 7025 7026 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 7027 if (!table) 7028 goto out; 7029 7030 for (i = 0; table[i].data; i++) { 7031 table[i].data += (char *)p - (char *)&ipv6_devconf; 7032 /* If one of these is already set, then it is not safe to 7033 * overwrite either of them: this makes proc_dointvec_minmax 7034 * usable. 7035 */ 7036 if (!table[i].extra1 && !table[i].extra2) { 7037 table[i].extra1 = idev; /* embedded; no ref */ 7038 table[i].extra2 = net; 7039 } 7040 } 7041 7042 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 7043 7044 p->sysctl_header = register_net_sysctl(net, path, table); 7045 if (!p->sysctl_header) 7046 goto free; 7047 7048 if (!strcmp(dev_name, "all")) 7049 ifindex = NETCONFA_IFINDEX_ALL; 7050 else if (!strcmp(dev_name, "default")) 7051 ifindex = NETCONFA_IFINDEX_DEFAULT; 7052 else 7053 ifindex = idev->dev->ifindex; 7054 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 7055 ifindex, p); 7056 return 0; 7057 7058 free: 7059 kfree(table); 7060 out: 7061 return -ENOBUFS; 7062 } 7063 7064 static void __addrconf_sysctl_unregister(struct net *net, 7065 struct ipv6_devconf *p, int ifindex) 7066 { 7067 struct ctl_table *table; 7068 7069 if (!p->sysctl_header) 7070 return; 7071 7072 table = p->sysctl_header->ctl_table_arg; 7073 unregister_net_sysctl_table(p->sysctl_header); 7074 p->sysctl_header = NULL; 7075 kfree(table); 7076 7077 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 7078 } 7079 7080 static int addrconf_sysctl_register(struct inet6_dev *idev) 7081 { 7082 int err; 7083 7084 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 7085 return -EINVAL; 7086 7087 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 7088 &ndisc_ifinfo_sysctl_change); 7089 if (err) 7090 return err; 7091 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 7092 idev, &idev->cnf); 7093 if (err) 7094 neigh_sysctl_unregister(idev->nd_parms); 7095 7096 return err; 7097 } 7098 7099 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 7100 { 7101 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 7102 idev->dev->ifindex); 7103 neigh_sysctl_unregister(idev->nd_parms); 7104 } 7105 7106 7107 #endif 7108 7109 static int __net_init addrconf_init_net(struct net *net) 7110 { 7111 int err = -ENOMEM; 7112 struct ipv6_devconf *all, *dflt; 7113 7114 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 7115 if (!all) 7116 goto err_alloc_all; 7117 7118 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 7119 if (!dflt) 7120 goto err_alloc_dflt; 7121 7122 if (IS_ENABLED(CONFIG_SYSCTL) && 7123 !net_eq(net, &init_net)) { 7124 switch (sysctl_devconf_inherit_init_net) { 7125 case 1: /* copy from init_net */ 7126 memcpy(all, init_net.ipv6.devconf_all, 7127 sizeof(ipv6_devconf)); 7128 memcpy(dflt, init_net.ipv6.devconf_dflt, 7129 sizeof(ipv6_devconf_dflt)); 7130 break; 7131 case 3: /* copy from the current netns */ 7132 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all, 7133 sizeof(ipv6_devconf)); 7134 memcpy(dflt, 7135 current->nsproxy->net_ns->ipv6.devconf_dflt, 7136 sizeof(ipv6_devconf_dflt)); 7137 break; 7138 case 0: 7139 case 2: 7140 /* use compiled values */ 7141 break; 7142 } 7143 } 7144 7145 /* these will be inherited by all namespaces */ 7146 dflt->autoconf = ipv6_defaults.autoconf; 7147 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 7148 7149 dflt->stable_secret.initialized = false; 7150 all->stable_secret.initialized = false; 7151 7152 net->ipv6.devconf_all = all; 7153 net->ipv6.devconf_dflt = dflt; 7154 7155 #ifdef CONFIG_SYSCTL 7156 err = __addrconf_sysctl_register(net, "all", NULL, all); 7157 if (err < 0) 7158 goto err_reg_all; 7159 7160 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 7161 if (err < 0) 7162 goto err_reg_dflt; 7163 #endif 7164 return 0; 7165 7166 #ifdef CONFIG_SYSCTL 7167 err_reg_dflt: 7168 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 7169 err_reg_all: 7170 kfree(dflt); 7171 #endif 7172 err_alloc_dflt: 7173 kfree(all); 7174 err_alloc_all: 7175 return err; 7176 } 7177 7178 static void __net_exit addrconf_exit_net(struct net *net) 7179 { 7180 #ifdef CONFIG_SYSCTL 7181 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 7182 NETCONFA_IFINDEX_DEFAULT); 7183 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 7184 NETCONFA_IFINDEX_ALL); 7185 #endif 7186 kfree(net->ipv6.devconf_dflt); 7187 kfree(net->ipv6.devconf_all); 7188 } 7189 7190 static struct pernet_operations addrconf_ops = { 7191 .init = addrconf_init_net, 7192 .exit = addrconf_exit_net, 7193 }; 7194 7195 static struct rtnl_af_ops inet6_ops __read_mostly = { 7196 .family = AF_INET6, 7197 .fill_link_af = inet6_fill_link_af, 7198 .get_link_af_size = inet6_get_link_af_size, 7199 .validate_link_af = inet6_validate_link_af, 7200 .set_link_af = inet6_set_link_af, 7201 }; 7202 7203 /* 7204 * Init / cleanup code 7205 */ 7206 7207 int __init addrconf_init(void) 7208 { 7209 struct inet6_dev *idev; 7210 int i, err; 7211 7212 err = ipv6_addr_label_init(); 7213 if (err < 0) { 7214 pr_crit("%s: cannot initialize default policy table: %d\n", 7215 __func__, err); 7216 goto out; 7217 } 7218 7219 err = register_pernet_subsys(&addrconf_ops); 7220 if (err < 0) 7221 goto out_addrlabel; 7222 7223 addrconf_wq = create_workqueue("ipv6_addrconf"); 7224 if (!addrconf_wq) { 7225 err = -ENOMEM; 7226 goto out_nowq; 7227 } 7228 7229 /* The addrconf netdev notifier requires that loopback_dev 7230 * has it's ipv6 private information allocated and setup 7231 * before it can bring up and give link-local addresses 7232 * to other devices which are up. 7233 * 7234 * Unfortunately, loopback_dev is not necessarily the first 7235 * entry in the global dev_base list of net devices. In fact, 7236 * it is likely to be the very last entry on that list. 7237 * So this causes the notifier registry below to try and 7238 * give link-local addresses to all devices besides loopback_dev 7239 * first, then loopback_dev, which cases all the non-loopback_dev 7240 * devices to fail to get a link-local address. 7241 * 7242 * So, as a temporary fix, allocate the ipv6 structure for 7243 * loopback_dev first by hand. 7244 * Longer term, all of the dependencies ipv6 has upon the loopback 7245 * device and it being up should be removed. 7246 */ 7247 rtnl_lock(); 7248 idev = ipv6_add_dev(init_net.loopback_dev); 7249 rtnl_unlock(); 7250 if (IS_ERR(idev)) { 7251 err = PTR_ERR(idev); 7252 goto errlo; 7253 } 7254 7255 ip6_route_init_special_entries(); 7256 7257 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7258 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 7259 7260 register_netdevice_notifier(&ipv6_dev_notf); 7261 7262 addrconf_verify(); 7263 7264 rtnl_af_register(&inet6_ops); 7265 7266 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK, 7267 NULL, inet6_dump_ifinfo, 0); 7268 if (err < 0) 7269 goto errout; 7270 7271 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR, 7272 inet6_rtm_newaddr, NULL, 0); 7273 if (err < 0) 7274 goto errout; 7275 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR, 7276 inet6_rtm_deladdr, NULL, 0); 7277 if (err < 0) 7278 goto errout; 7279 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR, 7280 inet6_rtm_getaddr, inet6_dump_ifaddr, 7281 RTNL_FLAG_DOIT_UNLOCKED); 7282 if (err < 0) 7283 goto errout; 7284 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST, 7285 NULL, inet6_dump_ifmcaddr, 0); 7286 if (err < 0) 7287 goto errout; 7288 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST, 7289 NULL, inet6_dump_ifacaddr, 0); 7290 if (err < 0) 7291 goto errout; 7292 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF, 7293 inet6_netconf_get_devconf, 7294 inet6_netconf_dump_devconf, 7295 RTNL_FLAG_DOIT_UNLOCKED); 7296 if (err < 0) 7297 goto errout; 7298 err = ipv6_addr_label_rtnl_register(); 7299 if (err < 0) 7300 goto errout; 7301 7302 return 0; 7303 errout: 7304 rtnl_unregister_all(PF_INET6); 7305 rtnl_af_unregister(&inet6_ops); 7306 unregister_netdevice_notifier(&ipv6_dev_notf); 7307 errlo: 7308 destroy_workqueue(addrconf_wq); 7309 out_nowq: 7310 unregister_pernet_subsys(&addrconf_ops); 7311 out_addrlabel: 7312 ipv6_addr_label_cleanup(); 7313 out: 7314 return err; 7315 } 7316 7317 void addrconf_cleanup(void) 7318 { 7319 struct net_device *dev; 7320 int i; 7321 7322 unregister_netdevice_notifier(&ipv6_dev_notf); 7323 unregister_pernet_subsys(&addrconf_ops); 7324 ipv6_addr_label_cleanup(); 7325 7326 rtnl_af_unregister(&inet6_ops); 7327 7328 rtnl_lock(); 7329 7330 /* clean dev list */ 7331 for_each_netdev(&init_net, dev) { 7332 if (__in6_dev_get(dev) == NULL) 7333 continue; 7334 addrconf_ifdown(dev, true); 7335 } 7336 addrconf_ifdown(init_net.loopback_dev, true); 7337 7338 /* 7339 * Check hash table. 7340 */ 7341 spin_lock_bh(&addrconf_hash_lock); 7342 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7343 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 7344 spin_unlock_bh(&addrconf_hash_lock); 7345 cancel_delayed_work(&addr_chk_work); 7346 rtnl_unlock(); 7347 7348 destroy_workqueue(addrconf_wq); 7349 } 7350