1 /* 2 * IPv6 Address [auto]configuration 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * as published by the Free Software Foundation; either version 12 * 2 of the License, or (at your option) any later version. 13 */ 14 15 /* 16 * Changes: 17 * 18 * Janos Farkas : delete timer on ifdown 19 * <chexum@bankinf.banki.hu> 20 * Andi Kleen : kill double kfree on module 21 * unload. 22 * Maciej W. Rozycki : FDDI support 23 * sekiya@USAGI : Don't send too many RS 24 * packets. 25 * yoshfuji@USAGI : Fixed interval between DAD 26 * packets. 27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 28 * address validation timer. 29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 30 * support. 31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 32 * address on a same interface. 33 * YOSHIFUJI Hideaki @USAGI : ARCnet support 34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 35 * seq_file. 36 * YOSHIFUJI Hideaki @USAGI : improved source address 37 * selection; consider scope, 38 * status etc. 39 */ 40 41 #define pr_fmt(fmt) "IPv6: " fmt 42 43 #include <linux/errno.h> 44 #include <linux/types.h> 45 #include <linux/kernel.h> 46 #include <linux/sched/signal.h> 47 #include <linux/socket.h> 48 #include <linux/sockios.h> 49 #include <linux/net.h> 50 #include <linux/inet.h> 51 #include <linux/in6.h> 52 #include <linux/netdevice.h> 53 #include <linux/if_addr.h> 54 #include <linux/if_arp.h> 55 #include <linux/if_arcnet.h> 56 #include <linux/if_infiniband.h> 57 #include <linux/route.h> 58 #include <linux/inetdevice.h> 59 #include <linux/init.h> 60 #include <linux/slab.h> 61 #ifdef CONFIG_SYSCTL 62 #include <linux/sysctl.h> 63 #endif 64 #include <linux/capability.h> 65 #include <linux/delay.h> 66 #include <linux/notifier.h> 67 #include <linux/string.h> 68 #include <linux/hash.h> 69 70 #include <net/net_namespace.h> 71 #include <net/sock.h> 72 #include <net/snmp.h> 73 74 #include <net/6lowpan.h> 75 #include <net/firewire.h> 76 #include <net/ipv6.h> 77 #include <net/protocol.h> 78 #include <net/ndisc.h> 79 #include <net/ip6_route.h> 80 #include <net/addrconf.h> 81 #include <net/tcp.h> 82 #include <net/ip.h> 83 #include <net/netlink.h> 84 #include <net/pkt_sched.h> 85 #include <net/l3mdev.h> 86 #include <linux/if_tunnel.h> 87 #include <linux/rtnetlink.h> 88 #include <linux/netconf.h> 89 #include <linux/random.h> 90 #include <linux/uaccess.h> 91 #include <asm/unaligned.h> 92 93 #include <linux/proc_fs.h> 94 #include <linux/seq_file.h> 95 #include <linux/export.h> 96 97 #define INFINITY_LIFE_TIME 0xFFFFFFFF 98 99 #define IPV6_MAX_STRLEN \ 100 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") 101 102 static inline u32 cstamp_delta(unsigned long cstamp) 103 { 104 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 105 } 106 107 static inline s32 rfc3315_s14_backoff_init(s32 irt) 108 { 109 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */ 110 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt; 111 do_div(tmp, 1000000); 112 return (s32)tmp; 113 } 114 115 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt) 116 { 117 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */ 118 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt; 119 do_div(tmp, 1000000); 120 if ((s32)tmp > mrt) { 121 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */ 122 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt; 123 do_div(tmp, 1000000); 124 } 125 return (s32)tmp; 126 } 127 128 #ifdef CONFIG_SYSCTL 129 static int addrconf_sysctl_register(struct inet6_dev *idev); 130 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 131 #else 132 static inline int addrconf_sysctl_register(struct inet6_dev *idev) 133 { 134 return 0; 135 } 136 137 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 138 { 139 } 140 #endif 141 142 static void ipv6_regen_rndid(struct inet6_dev *idev); 143 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 144 145 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 146 static int ipv6_count_addresses(const struct inet6_dev *idev); 147 static int ipv6_generate_stable_address(struct in6_addr *addr, 148 u8 dad_count, 149 const struct inet6_dev *idev); 150 151 #define IN6_ADDR_HSIZE_SHIFT 8 152 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT) 153 /* 154 * Configured unicast address hash table 155 */ 156 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 157 static DEFINE_SPINLOCK(addrconf_hash_lock); 158 159 static void addrconf_verify(void); 160 static void addrconf_verify_rtnl(void); 161 static void addrconf_verify_work(struct work_struct *); 162 163 static struct workqueue_struct *addrconf_wq; 164 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work); 165 166 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 167 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 168 169 static void addrconf_type_change(struct net_device *dev, 170 unsigned long event); 171 static int addrconf_ifdown(struct net_device *dev, int how); 172 173 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 174 int plen, 175 const struct net_device *dev, 176 u32 flags, u32 noflags); 177 178 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 179 static void addrconf_dad_work(struct work_struct *w); 180 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 181 bool send_na); 182 static void addrconf_dad_run(struct inet6_dev *idev); 183 static void addrconf_rs_timer(struct timer_list *t); 184 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 185 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 186 187 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 188 struct prefix_info *pinfo); 189 190 static struct ipv6_devconf ipv6_devconf __read_mostly = { 191 .forwarding = 0, 192 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 193 .mtu6 = IPV6_MIN_MTU, 194 .accept_ra = 1, 195 .accept_redirects = 1, 196 .autoconf = 1, 197 .force_mld_version = 0, 198 .mldv1_unsolicited_report_interval = 10 * HZ, 199 .mldv2_unsolicited_report_interval = HZ, 200 .dad_transmits = 1, 201 .rtr_solicits = MAX_RTR_SOLICITATIONS, 202 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 203 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 204 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 205 .use_tempaddr = 0, 206 .temp_valid_lft = TEMP_VALID_LIFETIME, 207 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 208 .regen_max_retry = REGEN_MAX_RETRY, 209 .max_desync_factor = MAX_DESYNC_FACTOR, 210 .max_addresses = IPV6_MAX_ADDRESSES, 211 .accept_ra_defrtr = 1, 212 .accept_ra_from_local = 0, 213 .accept_ra_min_hop_limit= 1, 214 .accept_ra_pinfo = 1, 215 #ifdef CONFIG_IPV6_ROUTER_PREF 216 .accept_ra_rtr_pref = 1, 217 .rtr_probe_interval = 60 * HZ, 218 #ifdef CONFIG_IPV6_ROUTE_INFO 219 .accept_ra_rt_info_min_plen = 0, 220 .accept_ra_rt_info_max_plen = 0, 221 #endif 222 #endif 223 .proxy_ndp = 0, 224 .accept_source_route = 0, /* we do not accept RH0 by default. */ 225 .disable_ipv6 = 0, 226 .accept_dad = 0, 227 .suppress_frag_ndisc = 1, 228 .accept_ra_mtu = 1, 229 .stable_secret = { 230 .initialized = false, 231 }, 232 .use_oif_addrs_only = 0, 233 .ignore_routes_with_linkdown = 0, 234 .keep_addr_on_down = 0, 235 .seg6_enabled = 0, 236 #ifdef CONFIG_IPV6_SEG6_HMAC 237 .seg6_require_hmac = 0, 238 #endif 239 .enhanced_dad = 1, 240 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 241 .disable_policy = 0, 242 }; 243 244 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 245 .forwarding = 0, 246 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 247 .mtu6 = IPV6_MIN_MTU, 248 .accept_ra = 1, 249 .accept_redirects = 1, 250 .autoconf = 1, 251 .force_mld_version = 0, 252 .mldv1_unsolicited_report_interval = 10 * HZ, 253 .mldv2_unsolicited_report_interval = HZ, 254 .dad_transmits = 1, 255 .rtr_solicits = MAX_RTR_SOLICITATIONS, 256 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 257 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 258 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 259 .use_tempaddr = 0, 260 .temp_valid_lft = TEMP_VALID_LIFETIME, 261 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 262 .regen_max_retry = REGEN_MAX_RETRY, 263 .max_desync_factor = MAX_DESYNC_FACTOR, 264 .max_addresses = IPV6_MAX_ADDRESSES, 265 .accept_ra_defrtr = 1, 266 .accept_ra_from_local = 0, 267 .accept_ra_min_hop_limit= 1, 268 .accept_ra_pinfo = 1, 269 #ifdef CONFIG_IPV6_ROUTER_PREF 270 .accept_ra_rtr_pref = 1, 271 .rtr_probe_interval = 60 * HZ, 272 #ifdef CONFIG_IPV6_ROUTE_INFO 273 .accept_ra_rt_info_min_plen = 0, 274 .accept_ra_rt_info_max_plen = 0, 275 #endif 276 #endif 277 .proxy_ndp = 0, 278 .accept_source_route = 0, /* we do not accept RH0 by default. */ 279 .disable_ipv6 = 0, 280 .accept_dad = 1, 281 .suppress_frag_ndisc = 1, 282 .accept_ra_mtu = 1, 283 .stable_secret = { 284 .initialized = false, 285 }, 286 .use_oif_addrs_only = 0, 287 .ignore_routes_with_linkdown = 0, 288 .keep_addr_on_down = 0, 289 .seg6_enabled = 0, 290 #ifdef CONFIG_IPV6_SEG6_HMAC 291 .seg6_require_hmac = 0, 292 #endif 293 .enhanced_dad = 1, 294 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 295 .disable_policy = 0, 296 }; 297 298 /* Check if link is ready: is it up and is a valid qdisc available */ 299 static inline bool addrconf_link_ready(const struct net_device *dev) 300 { 301 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev); 302 } 303 304 static void addrconf_del_rs_timer(struct inet6_dev *idev) 305 { 306 if (del_timer(&idev->rs_timer)) 307 __in6_dev_put(idev); 308 } 309 310 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 311 { 312 if (cancel_delayed_work(&ifp->dad_work)) 313 __in6_ifa_put(ifp); 314 } 315 316 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 317 unsigned long when) 318 { 319 if (!timer_pending(&idev->rs_timer)) 320 in6_dev_hold(idev); 321 mod_timer(&idev->rs_timer, jiffies + when); 322 } 323 324 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 325 unsigned long delay) 326 { 327 in6_ifa_hold(ifp); 328 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay)) 329 in6_ifa_put(ifp); 330 } 331 332 static int snmp6_alloc_dev(struct inet6_dev *idev) 333 { 334 int i; 335 336 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib); 337 if (!idev->stats.ipv6) 338 goto err_ip; 339 340 for_each_possible_cpu(i) { 341 struct ipstats_mib *addrconf_stats; 342 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 343 u64_stats_init(&addrconf_stats->syncp); 344 } 345 346 347 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 348 GFP_KERNEL); 349 if (!idev->stats.icmpv6dev) 350 goto err_icmp; 351 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 352 GFP_KERNEL); 353 if (!idev->stats.icmpv6msgdev) 354 goto err_icmpmsg; 355 356 return 0; 357 358 err_icmpmsg: 359 kfree(idev->stats.icmpv6dev); 360 err_icmp: 361 free_percpu(idev->stats.ipv6); 362 err_ip: 363 return -ENOMEM; 364 } 365 366 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 367 { 368 struct inet6_dev *ndev; 369 int err = -ENOMEM; 370 371 ASSERT_RTNL(); 372 373 if (dev->mtu < IPV6_MIN_MTU) 374 return ERR_PTR(-EINVAL); 375 376 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 377 if (!ndev) 378 return ERR_PTR(err); 379 380 rwlock_init(&ndev->lock); 381 ndev->dev = dev; 382 INIT_LIST_HEAD(&ndev->addr_list); 383 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0); 384 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 385 386 if (ndev->cnf.stable_secret.initialized) 387 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 388 389 ndev->cnf.mtu6 = dev->mtu; 390 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 391 if (!ndev->nd_parms) { 392 kfree(ndev); 393 return ERR_PTR(err); 394 } 395 if (ndev->cnf.forwarding) 396 dev_disable_lro(dev); 397 /* We refer to the device */ 398 dev_hold(dev); 399 400 if (snmp6_alloc_dev(ndev) < 0) { 401 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n", 402 __func__); 403 neigh_parms_release(&nd_tbl, ndev->nd_parms); 404 dev_put(dev); 405 kfree(ndev); 406 return ERR_PTR(err); 407 } 408 409 if (snmp6_register_dev(ndev) < 0) { 410 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n", 411 __func__, dev->name); 412 goto err_release; 413 } 414 415 /* One reference from device. */ 416 refcount_set(&ndev->refcnt, 1); 417 418 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 419 ndev->cnf.accept_dad = -1; 420 421 #if IS_ENABLED(CONFIG_IPV6_SIT) 422 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 423 pr_info("%s: Disabled Multicast RS\n", dev->name); 424 ndev->cnf.rtr_solicits = 0; 425 } 426 #endif 427 428 INIT_LIST_HEAD(&ndev->tempaddr_list); 429 ndev->desync_factor = U32_MAX; 430 if ((dev->flags&IFF_LOOPBACK) || 431 dev->type == ARPHRD_TUNNEL || 432 dev->type == ARPHRD_TUNNEL6 || 433 dev->type == ARPHRD_SIT || 434 dev->type == ARPHRD_NONE) { 435 ndev->cnf.use_tempaddr = -1; 436 } else 437 ipv6_regen_rndid(ndev); 438 439 ndev->token = in6addr_any; 440 441 if (netif_running(dev) && addrconf_link_ready(dev)) 442 ndev->if_flags |= IF_READY; 443 444 ipv6_mc_init_dev(ndev); 445 ndev->tstamp = jiffies; 446 err = addrconf_sysctl_register(ndev); 447 if (err) { 448 ipv6_mc_destroy_dev(ndev); 449 snmp6_unregister_dev(ndev); 450 goto err_release; 451 } 452 /* protected by rtnl_lock */ 453 rcu_assign_pointer(dev->ip6_ptr, ndev); 454 455 /* Join interface-local all-node multicast group */ 456 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 457 458 /* Join all-node multicast group */ 459 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 460 461 /* Join all-router multicast group if forwarding is set */ 462 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 463 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 464 465 return ndev; 466 467 err_release: 468 neigh_parms_release(&nd_tbl, ndev->nd_parms); 469 ndev->dead = 1; 470 in6_dev_finish_destroy(ndev); 471 return ERR_PTR(err); 472 } 473 474 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 475 { 476 struct inet6_dev *idev; 477 478 ASSERT_RTNL(); 479 480 idev = __in6_dev_get(dev); 481 if (!idev) { 482 idev = ipv6_add_dev(dev); 483 if (IS_ERR(idev)) 484 return NULL; 485 } 486 487 if (dev->flags&IFF_UP) 488 ipv6_mc_up(idev); 489 return idev; 490 } 491 492 static int inet6_netconf_msgsize_devconf(int type) 493 { 494 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 495 + nla_total_size(4); /* NETCONFA_IFINDEX */ 496 bool all = false; 497 498 if (type == NETCONFA_ALL) 499 all = true; 500 501 if (all || type == NETCONFA_FORWARDING) 502 size += nla_total_size(4); 503 #ifdef CONFIG_IPV6_MROUTE 504 if (all || type == NETCONFA_MC_FORWARDING) 505 size += nla_total_size(4); 506 #endif 507 if (all || type == NETCONFA_PROXY_NEIGH) 508 size += nla_total_size(4); 509 510 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 511 size += nla_total_size(4); 512 513 return size; 514 } 515 516 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 517 struct ipv6_devconf *devconf, u32 portid, 518 u32 seq, int event, unsigned int flags, 519 int type) 520 { 521 struct nlmsghdr *nlh; 522 struct netconfmsg *ncm; 523 bool all = false; 524 525 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 526 flags); 527 if (!nlh) 528 return -EMSGSIZE; 529 530 if (type == NETCONFA_ALL) 531 all = true; 532 533 ncm = nlmsg_data(nlh); 534 ncm->ncm_family = AF_INET6; 535 536 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 537 goto nla_put_failure; 538 539 if (!devconf) 540 goto out; 541 542 if ((all || type == NETCONFA_FORWARDING) && 543 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 544 goto nla_put_failure; 545 #ifdef CONFIG_IPV6_MROUTE 546 if ((all || type == NETCONFA_MC_FORWARDING) && 547 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 548 devconf->mc_forwarding) < 0) 549 goto nla_put_failure; 550 #endif 551 if ((all || type == NETCONFA_PROXY_NEIGH) && 552 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 553 goto nla_put_failure; 554 555 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 556 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 557 devconf->ignore_routes_with_linkdown) < 0) 558 goto nla_put_failure; 559 560 out: 561 nlmsg_end(skb, nlh); 562 return 0; 563 564 nla_put_failure: 565 nlmsg_cancel(skb, nlh); 566 return -EMSGSIZE; 567 } 568 569 void inet6_netconf_notify_devconf(struct net *net, int event, int type, 570 int ifindex, struct ipv6_devconf *devconf) 571 { 572 struct sk_buff *skb; 573 int err = -ENOBUFS; 574 575 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL); 576 if (!skb) 577 goto errout; 578 579 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 580 event, 0, type); 581 if (err < 0) { 582 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 583 WARN_ON(err == -EMSGSIZE); 584 kfree_skb(skb); 585 goto errout; 586 } 587 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL); 588 return; 589 errout: 590 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 591 } 592 593 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 594 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 595 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 596 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 597 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 598 }; 599 600 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 601 struct nlmsghdr *nlh, 602 struct netlink_ext_ack *extack) 603 { 604 struct net *net = sock_net(in_skb->sk); 605 struct nlattr *tb[NETCONFA_MAX+1]; 606 struct inet6_dev *in6_dev = NULL; 607 struct net_device *dev = NULL; 608 struct netconfmsg *ncm; 609 struct sk_buff *skb; 610 struct ipv6_devconf *devconf; 611 int ifindex; 612 int err; 613 614 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, 615 devconf_ipv6_policy, extack); 616 if (err < 0) 617 return err; 618 619 if (!tb[NETCONFA_IFINDEX]) 620 return -EINVAL; 621 622 err = -EINVAL; 623 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 624 switch (ifindex) { 625 case NETCONFA_IFINDEX_ALL: 626 devconf = net->ipv6.devconf_all; 627 break; 628 case NETCONFA_IFINDEX_DEFAULT: 629 devconf = net->ipv6.devconf_dflt; 630 break; 631 default: 632 dev = dev_get_by_index(net, ifindex); 633 if (!dev) 634 return -EINVAL; 635 in6_dev = in6_dev_get(dev); 636 if (!in6_dev) 637 goto errout; 638 devconf = &in6_dev->cnf; 639 break; 640 } 641 642 err = -ENOBUFS; 643 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); 644 if (!skb) 645 goto errout; 646 647 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 648 NETLINK_CB(in_skb).portid, 649 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 650 NETCONFA_ALL); 651 if (err < 0) { 652 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 653 WARN_ON(err == -EMSGSIZE); 654 kfree_skb(skb); 655 goto errout; 656 } 657 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 658 errout: 659 if (in6_dev) 660 in6_dev_put(in6_dev); 661 if (dev) 662 dev_put(dev); 663 return err; 664 } 665 666 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 667 struct netlink_callback *cb) 668 { 669 struct net *net = sock_net(skb->sk); 670 int h, s_h; 671 int idx, s_idx; 672 struct net_device *dev; 673 struct inet6_dev *idev; 674 struct hlist_head *head; 675 676 s_h = cb->args[0]; 677 s_idx = idx = cb->args[1]; 678 679 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 680 idx = 0; 681 head = &net->dev_index_head[h]; 682 rcu_read_lock(); 683 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 684 net->dev_base_seq; 685 hlist_for_each_entry_rcu(dev, head, index_hlist) { 686 if (idx < s_idx) 687 goto cont; 688 idev = __in6_dev_get(dev); 689 if (!idev) 690 goto cont; 691 692 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 693 &idev->cnf, 694 NETLINK_CB(cb->skb).portid, 695 cb->nlh->nlmsg_seq, 696 RTM_NEWNETCONF, 697 NLM_F_MULTI, 698 NETCONFA_ALL) < 0) { 699 rcu_read_unlock(); 700 goto done; 701 } 702 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 703 cont: 704 idx++; 705 } 706 rcu_read_unlock(); 707 } 708 if (h == NETDEV_HASHENTRIES) { 709 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 710 net->ipv6.devconf_all, 711 NETLINK_CB(cb->skb).portid, 712 cb->nlh->nlmsg_seq, 713 RTM_NEWNETCONF, NLM_F_MULTI, 714 NETCONFA_ALL) < 0) 715 goto done; 716 else 717 h++; 718 } 719 if (h == NETDEV_HASHENTRIES + 1) { 720 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 721 net->ipv6.devconf_dflt, 722 NETLINK_CB(cb->skb).portid, 723 cb->nlh->nlmsg_seq, 724 RTM_NEWNETCONF, NLM_F_MULTI, 725 NETCONFA_ALL) < 0) 726 goto done; 727 else 728 h++; 729 } 730 done: 731 cb->args[0] = h; 732 cb->args[1] = idx; 733 734 return skb->len; 735 } 736 737 #ifdef CONFIG_SYSCTL 738 static void dev_forward_change(struct inet6_dev *idev) 739 { 740 struct net_device *dev; 741 struct inet6_ifaddr *ifa; 742 743 if (!idev) 744 return; 745 dev = idev->dev; 746 if (idev->cnf.forwarding) 747 dev_disable_lro(dev); 748 if (dev->flags & IFF_MULTICAST) { 749 if (idev->cnf.forwarding) { 750 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 751 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 752 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 753 } else { 754 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 755 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 756 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 757 } 758 } 759 760 list_for_each_entry(ifa, &idev->addr_list, if_list) { 761 if (ifa->flags&IFA_F_TENTATIVE) 762 continue; 763 if (idev->cnf.forwarding) 764 addrconf_join_anycast(ifa); 765 else 766 addrconf_leave_anycast(ifa); 767 } 768 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, 769 NETCONFA_FORWARDING, 770 dev->ifindex, &idev->cnf); 771 } 772 773 774 static void addrconf_forward_change(struct net *net, __s32 newf) 775 { 776 struct net_device *dev; 777 struct inet6_dev *idev; 778 779 for_each_netdev(net, dev) { 780 idev = __in6_dev_get(dev); 781 if (idev) { 782 int changed = (!idev->cnf.forwarding) ^ (!newf); 783 idev->cnf.forwarding = newf; 784 if (changed) 785 dev_forward_change(idev); 786 } 787 } 788 } 789 790 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 791 { 792 struct net *net; 793 int old; 794 795 if (!rtnl_trylock()) 796 return restart_syscall(); 797 798 net = (struct net *)table->extra2; 799 old = *p; 800 *p = newf; 801 802 if (p == &net->ipv6.devconf_dflt->forwarding) { 803 if ((!newf) ^ (!old)) 804 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 805 NETCONFA_FORWARDING, 806 NETCONFA_IFINDEX_DEFAULT, 807 net->ipv6.devconf_dflt); 808 rtnl_unlock(); 809 return 0; 810 } 811 812 if (p == &net->ipv6.devconf_all->forwarding) { 813 int old_dflt = net->ipv6.devconf_dflt->forwarding; 814 815 net->ipv6.devconf_dflt->forwarding = newf; 816 if ((!newf) ^ (!old_dflt)) 817 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 818 NETCONFA_FORWARDING, 819 NETCONFA_IFINDEX_DEFAULT, 820 net->ipv6.devconf_dflt); 821 822 addrconf_forward_change(net, newf); 823 if ((!newf) ^ (!old)) 824 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 825 NETCONFA_FORWARDING, 826 NETCONFA_IFINDEX_ALL, 827 net->ipv6.devconf_all); 828 } else if ((!newf) ^ (!old)) 829 dev_forward_change((struct inet6_dev *)table->extra1); 830 rtnl_unlock(); 831 832 if (newf) 833 rt6_purge_dflt_routers(net); 834 return 1; 835 } 836 837 static void addrconf_linkdown_change(struct net *net, __s32 newf) 838 { 839 struct net_device *dev; 840 struct inet6_dev *idev; 841 842 for_each_netdev(net, dev) { 843 idev = __in6_dev_get(dev); 844 if (idev) { 845 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 846 847 idev->cnf.ignore_routes_with_linkdown = newf; 848 if (changed) 849 inet6_netconf_notify_devconf(dev_net(dev), 850 RTM_NEWNETCONF, 851 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 852 dev->ifindex, 853 &idev->cnf); 854 } 855 } 856 } 857 858 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 859 { 860 struct net *net; 861 int old; 862 863 if (!rtnl_trylock()) 864 return restart_syscall(); 865 866 net = (struct net *)table->extra2; 867 old = *p; 868 *p = newf; 869 870 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 871 if ((!newf) ^ (!old)) 872 inet6_netconf_notify_devconf(net, 873 RTM_NEWNETCONF, 874 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 875 NETCONFA_IFINDEX_DEFAULT, 876 net->ipv6.devconf_dflt); 877 rtnl_unlock(); 878 return 0; 879 } 880 881 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 882 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 883 addrconf_linkdown_change(net, newf); 884 if ((!newf) ^ (!old)) 885 inet6_netconf_notify_devconf(net, 886 RTM_NEWNETCONF, 887 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 888 NETCONFA_IFINDEX_ALL, 889 net->ipv6.devconf_all); 890 } 891 rtnl_unlock(); 892 893 return 1; 894 } 895 896 #endif 897 898 /* Nobody refers to this ifaddr, destroy it */ 899 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 900 { 901 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 902 903 #ifdef NET_REFCNT_DEBUG 904 pr_debug("%s\n", __func__); 905 #endif 906 907 in6_dev_put(ifp->idev); 908 909 if (cancel_delayed_work(&ifp->dad_work)) 910 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 911 ifp); 912 913 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 914 pr_warn("Freeing alive inet6 address %p\n", ifp); 915 return; 916 } 917 918 kfree_rcu(ifp, rcu); 919 } 920 921 static void 922 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 923 { 924 struct list_head *p; 925 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 926 927 /* 928 * Each device address list is sorted in order of scope - 929 * global before linklocal. 930 */ 931 list_for_each(p, &idev->addr_list) { 932 struct inet6_ifaddr *ifa 933 = list_entry(p, struct inet6_ifaddr, if_list); 934 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 935 break; 936 } 937 938 list_add_tail_rcu(&ifp->if_list, p); 939 } 940 941 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr) 942 { 943 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net); 944 945 return hash_32(val, IN6_ADDR_HSIZE_SHIFT); 946 } 947 948 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 949 struct net_device *dev, unsigned int hash) 950 { 951 struct inet6_ifaddr *ifp; 952 953 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 954 if (!net_eq(dev_net(ifp->idev->dev), net)) 955 continue; 956 if (ipv6_addr_equal(&ifp->addr, addr)) { 957 if (!dev || ifp->idev->dev == dev) 958 return true; 959 } 960 } 961 return false; 962 } 963 964 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa) 965 { 966 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr); 967 int err = 0; 968 969 spin_lock(&addrconf_hash_lock); 970 971 /* Ignore adding duplicate addresses on an interface */ 972 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) { 973 netdev_dbg(dev, "ipv6_add_addr: already assigned\n"); 974 err = -EEXIST; 975 } else { 976 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 977 } 978 979 spin_unlock(&addrconf_hash_lock); 980 981 return err; 982 } 983 984 /* On success it returns ifp with increased reference count */ 985 986 static struct inet6_ifaddr * 987 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg, 988 bool can_block, struct netlink_ext_ack *extack) 989 { 990 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC; 991 int addr_type = ipv6_addr_type(cfg->pfx); 992 struct net *net = dev_net(idev->dev); 993 struct inet6_ifaddr *ifa = NULL; 994 struct fib6_info *f6i = NULL; 995 int err = 0; 996 997 if (addr_type == IPV6_ADDR_ANY || 998 addr_type & IPV6_ADDR_MULTICAST || 999 (!(idev->dev->flags & IFF_LOOPBACK) && 1000 addr_type & IPV6_ADDR_LOOPBACK)) 1001 return ERR_PTR(-EADDRNOTAVAIL); 1002 1003 if (idev->dead) { 1004 err = -ENODEV; /*XXX*/ 1005 goto out; 1006 } 1007 1008 if (idev->cnf.disable_ipv6) { 1009 err = -EACCES; 1010 goto out; 1011 } 1012 1013 /* validator notifier needs to be blocking; 1014 * do not call in atomic context 1015 */ 1016 if (can_block) { 1017 struct in6_validator_info i6vi = { 1018 .i6vi_addr = *cfg->pfx, 1019 .i6vi_dev = idev, 1020 .extack = extack, 1021 }; 1022 1023 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi); 1024 err = notifier_to_errno(err); 1025 if (err < 0) 1026 goto out; 1027 } 1028 1029 ifa = kzalloc(sizeof(*ifa), gfp_flags); 1030 if (!ifa) { 1031 err = -ENOBUFS; 1032 goto out; 1033 } 1034 1035 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags); 1036 if (IS_ERR(f6i)) { 1037 err = PTR_ERR(f6i); 1038 f6i = NULL; 1039 goto out; 1040 } 1041 1042 if (net->ipv6.devconf_all->disable_policy || 1043 idev->cnf.disable_policy) 1044 f6i->dst_nopolicy = true; 1045 1046 neigh_parms_data_state_setall(idev->nd_parms); 1047 1048 ifa->addr = *cfg->pfx; 1049 if (cfg->peer_pfx) 1050 ifa->peer_addr = *cfg->peer_pfx; 1051 1052 spin_lock_init(&ifa->lock); 1053 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1054 INIT_HLIST_NODE(&ifa->addr_lst); 1055 ifa->scope = cfg->scope; 1056 ifa->prefix_len = cfg->plen; 1057 ifa->rt_priority = cfg->rt_priority; 1058 ifa->flags = cfg->ifa_flags; 1059 /* No need to add the TENTATIVE flag for addresses with NODAD */ 1060 if (!(cfg->ifa_flags & IFA_F_NODAD)) 1061 ifa->flags |= IFA_F_TENTATIVE; 1062 ifa->valid_lft = cfg->valid_lft; 1063 ifa->prefered_lft = cfg->preferred_lft; 1064 ifa->cstamp = ifa->tstamp = jiffies; 1065 ifa->tokenized = false; 1066 1067 ifa->rt = f6i; 1068 1069 ifa->idev = idev; 1070 in6_dev_hold(idev); 1071 1072 /* For caller */ 1073 refcount_set(&ifa->refcnt, 1); 1074 1075 rcu_read_lock_bh(); 1076 1077 err = ipv6_add_addr_hash(idev->dev, ifa); 1078 if (err < 0) { 1079 rcu_read_unlock_bh(); 1080 goto out; 1081 } 1082 1083 write_lock(&idev->lock); 1084 1085 /* Add to inet6_dev unicast addr list. */ 1086 ipv6_link_dev_addr(idev, ifa); 1087 1088 if (ifa->flags&IFA_F_TEMPORARY) { 1089 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1090 in6_ifa_hold(ifa); 1091 } 1092 1093 in6_ifa_hold(ifa); 1094 write_unlock(&idev->lock); 1095 1096 rcu_read_unlock_bh(); 1097 1098 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1099 out: 1100 if (unlikely(err < 0)) { 1101 fib6_info_release(f6i); 1102 1103 if (ifa) { 1104 if (ifa->idev) 1105 in6_dev_put(ifa->idev); 1106 kfree(ifa); 1107 } 1108 ifa = ERR_PTR(err); 1109 } 1110 1111 return ifa; 1112 } 1113 1114 enum cleanup_prefix_rt_t { 1115 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1116 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1117 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1118 }; 1119 1120 /* 1121 * Check, whether the prefix for ifp would still need a prefix route 1122 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1123 * constants. 1124 * 1125 * 1) we don't purge prefix if address was not permanent. 1126 * prefix is managed by its own lifetime. 1127 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1128 * 3) if there are no addresses, delete prefix. 1129 * 4) if there are still other permanent address(es), 1130 * corresponding prefix is still permanent. 1131 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1132 * don't purge the prefix, assume user space is managing it. 1133 * 6) otherwise, update prefix lifetime to the 1134 * longest valid lifetime among the corresponding 1135 * addresses on the device. 1136 * Note: subsequent RA will update lifetime. 1137 **/ 1138 static enum cleanup_prefix_rt_t 1139 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1140 { 1141 struct inet6_ifaddr *ifa; 1142 struct inet6_dev *idev = ifp->idev; 1143 unsigned long lifetime; 1144 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1145 1146 *expires = jiffies; 1147 1148 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1149 if (ifa == ifp) 1150 continue; 1151 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1152 ifp->prefix_len)) 1153 continue; 1154 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1155 return CLEANUP_PREFIX_RT_NOP; 1156 1157 action = CLEANUP_PREFIX_RT_EXPIRE; 1158 1159 spin_lock(&ifa->lock); 1160 1161 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1162 /* 1163 * Note: Because this address is 1164 * not permanent, lifetime < 1165 * LONG_MAX / HZ here. 1166 */ 1167 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1168 *expires = ifa->tstamp + lifetime * HZ; 1169 spin_unlock(&ifa->lock); 1170 } 1171 1172 return action; 1173 } 1174 1175 static void 1176 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt) 1177 { 1178 struct fib6_info *f6i; 1179 1180 f6i = addrconf_get_prefix_route(&ifp->addr, 1181 ifp->prefix_len, 1182 ifp->idev->dev, 1183 0, RTF_GATEWAY | RTF_DEFAULT); 1184 if (f6i) { 1185 if (del_rt) 1186 ip6_del_rt(dev_net(ifp->idev->dev), f6i); 1187 else { 1188 if (!(f6i->fib6_flags & RTF_EXPIRES)) 1189 fib6_set_expires(f6i, expires); 1190 fib6_info_release(f6i); 1191 } 1192 } 1193 } 1194 1195 1196 /* This function wants to get referenced ifp and releases it before return */ 1197 1198 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1199 { 1200 int state; 1201 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1202 unsigned long expires; 1203 1204 ASSERT_RTNL(); 1205 1206 spin_lock_bh(&ifp->lock); 1207 state = ifp->state; 1208 ifp->state = INET6_IFADDR_STATE_DEAD; 1209 spin_unlock_bh(&ifp->lock); 1210 1211 if (state == INET6_IFADDR_STATE_DEAD) 1212 goto out; 1213 1214 spin_lock_bh(&addrconf_hash_lock); 1215 hlist_del_init_rcu(&ifp->addr_lst); 1216 spin_unlock_bh(&addrconf_hash_lock); 1217 1218 write_lock_bh(&ifp->idev->lock); 1219 1220 if (ifp->flags&IFA_F_TEMPORARY) { 1221 list_del(&ifp->tmp_list); 1222 if (ifp->ifpub) { 1223 in6_ifa_put(ifp->ifpub); 1224 ifp->ifpub = NULL; 1225 } 1226 __in6_ifa_put(ifp); 1227 } 1228 1229 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1230 action = check_cleanup_prefix_route(ifp, &expires); 1231 1232 list_del_rcu(&ifp->if_list); 1233 __in6_ifa_put(ifp); 1234 1235 write_unlock_bh(&ifp->idev->lock); 1236 1237 addrconf_del_dad_work(ifp); 1238 1239 ipv6_ifa_notify(RTM_DELADDR, ifp); 1240 1241 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1242 1243 if (action != CLEANUP_PREFIX_RT_NOP) { 1244 cleanup_prefix_route(ifp, expires, 1245 action == CLEANUP_PREFIX_RT_DEL); 1246 } 1247 1248 /* clean up prefsrc entries */ 1249 rt6_remove_prefsrc(ifp); 1250 out: 1251 in6_ifa_put(ifp); 1252 } 1253 1254 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, 1255 struct inet6_ifaddr *ift, 1256 bool block) 1257 { 1258 struct inet6_dev *idev = ifp->idev; 1259 struct in6_addr addr, *tmpaddr; 1260 unsigned long tmp_tstamp, age; 1261 unsigned long regen_advance; 1262 struct ifa6_config cfg; 1263 int ret = 0; 1264 unsigned long now = jiffies; 1265 long max_desync_factor; 1266 s32 cnf_temp_preferred_lft; 1267 1268 write_lock_bh(&idev->lock); 1269 if (ift) { 1270 spin_lock_bh(&ift->lock); 1271 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1272 spin_unlock_bh(&ift->lock); 1273 tmpaddr = &addr; 1274 } else { 1275 tmpaddr = NULL; 1276 } 1277 retry: 1278 in6_dev_hold(idev); 1279 if (idev->cnf.use_tempaddr <= 0) { 1280 write_unlock_bh(&idev->lock); 1281 pr_info("%s: use_tempaddr is disabled\n", __func__); 1282 in6_dev_put(idev); 1283 ret = -1; 1284 goto out; 1285 } 1286 spin_lock_bh(&ifp->lock); 1287 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1288 idev->cnf.use_tempaddr = -1; /*XXX*/ 1289 spin_unlock_bh(&ifp->lock); 1290 write_unlock_bh(&idev->lock); 1291 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1292 __func__); 1293 in6_dev_put(idev); 1294 ret = -1; 1295 goto out; 1296 } 1297 in6_ifa_hold(ifp); 1298 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1299 ipv6_try_regen_rndid(idev, tmpaddr); 1300 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1301 age = (now - ifp->tstamp) / HZ; 1302 1303 regen_advance = idev->cnf.regen_max_retry * 1304 idev->cnf.dad_transmits * 1305 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ; 1306 1307 /* recalculate max_desync_factor each time and update 1308 * idev->desync_factor if it's larger 1309 */ 1310 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1311 max_desync_factor = min_t(__u32, 1312 idev->cnf.max_desync_factor, 1313 cnf_temp_preferred_lft - regen_advance); 1314 1315 if (unlikely(idev->desync_factor > max_desync_factor)) { 1316 if (max_desync_factor > 0) { 1317 get_random_bytes(&idev->desync_factor, 1318 sizeof(idev->desync_factor)); 1319 idev->desync_factor %= max_desync_factor; 1320 } else { 1321 idev->desync_factor = 0; 1322 } 1323 } 1324 1325 memset(&cfg, 0, sizeof(cfg)); 1326 cfg.valid_lft = min_t(__u32, ifp->valid_lft, 1327 idev->cnf.temp_valid_lft + age); 1328 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor; 1329 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft); 1330 1331 cfg.plen = ifp->prefix_len; 1332 tmp_tstamp = ifp->tstamp; 1333 spin_unlock_bh(&ifp->lock); 1334 1335 write_unlock_bh(&idev->lock); 1336 1337 /* A temporary address is created only if this calculated Preferred 1338 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1339 * an implementation must not create a temporary address with a zero 1340 * Preferred Lifetime. 1341 * Use age calculation as in addrconf_verify to avoid unnecessary 1342 * temporary addresses being generated. 1343 */ 1344 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1345 if (cfg.preferred_lft <= regen_advance + age) { 1346 in6_ifa_put(ifp); 1347 in6_dev_put(idev); 1348 ret = -1; 1349 goto out; 1350 } 1351 1352 cfg.ifa_flags = IFA_F_TEMPORARY; 1353 /* set in addrconf_prefix_rcv() */ 1354 if (ifp->flags & IFA_F_OPTIMISTIC) 1355 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 1356 1357 cfg.pfx = &addr; 1358 cfg.scope = ipv6_addr_scope(cfg.pfx); 1359 1360 ift = ipv6_add_addr(idev, &cfg, block, NULL); 1361 if (IS_ERR(ift)) { 1362 in6_ifa_put(ifp); 1363 in6_dev_put(idev); 1364 pr_info("%s: retry temporary address regeneration\n", __func__); 1365 tmpaddr = &addr; 1366 write_lock_bh(&idev->lock); 1367 goto retry; 1368 } 1369 1370 spin_lock_bh(&ift->lock); 1371 ift->ifpub = ifp; 1372 ift->cstamp = now; 1373 ift->tstamp = tmp_tstamp; 1374 spin_unlock_bh(&ift->lock); 1375 1376 addrconf_dad_start(ift); 1377 in6_ifa_put(ift); 1378 in6_dev_put(idev); 1379 out: 1380 return ret; 1381 } 1382 1383 /* 1384 * Choose an appropriate source address (RFC3484) 1385 */ 1386 enum { 1387 IPV6_SADDR_RULE_INIT = 0, 1388 IPV6_SADDR_RULE_LOCAL, 1389 IPV6_SADDR_RULE_SCOPE, 1390 IPV6_SADDR_RULE_PREFERRED, 1391 #ifdef CONFIG_IPV6_MIP6 1392 IPV6_SADDR_RULE_HOA, 1393 #endif 1394 IPV6_SADDR_RULE_OIF, 1395 IPV6_SADDR_RULE_LABEL, 1396 IPV6_SADDR_RULE_PRIVACY, 1397 IPV6_SADDR_RULE_ORCHID, 1398 IPV6_SADDR_RULE_PREFIX, 1399 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1400 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1401 #endif 1402 IPV6_SADDR_RULE_MAX 1403 }; 1404 1405 struct ipv6_saddr_score { 1406 int rule; 1407 int addr_type; 1408 struct inet6_ifaddr *ifa; 1409 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1410 int scopedist; 1411 int matchlen; 1412 }; 1413 1414 struct ipv6_saddr_dst { 1415 const struct in6_addr *addr; 1416 int ifindex; 1417 int scope; 1418 int label; 1419 unsigned int prefs; 1420 }; 1421 1422 static inline int ipv6_saddr_preferred(int type) 1423 { 1424 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1425 return 1; 1426 return 0; 1427 } 1428 1429 static bool ipv6_use_optimistic_addr(struct net *net, 1430 struct inet6_dev *idev) 1431 { 1432 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1433 if (!idev) 1434 return false; 1435 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1436 return false; 1437 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic) 1438 return false; 1439 1440 return true; 1441 #else 1442 return false; 1443 #endif 1444 } 1445 1446 static bool ipv6_allow_optimistic_dad(struct net *net, 1447 struct inet6_dev *idev) 1448 { 1449 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1450 if (!idev) 1451 return false; 1452 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1453 return false; 1454 1455 return true; 1456 #else 1457 return false; 1458 #endif 1459 } 1460 1461 static int ipv6_get_saddr_eval(struct net *net, 1462 struct ipv6_saddr_score *score, 1463 struct ipv6_saddr_dst *dst, 1464 int i) 1465 { 1466 int ret; 1467 1468 if (i <= score->rule) { 1469 switch (i) { 1470 case IPV6_SADDR_RULE_SCOPE: 1471 ret = score->scopedist; 1472 break; 1473 case IPV6_SADDR_RULE_PREFIX: 1474 ret = score->matchlen; 1475 break; 1476 default: 1477 ret = !!test_bit(i, score->scorebits); 1478 } 1479 goto out; 1480 } 1481 1482 switch (i) { 1483 case IPV6_SADDR_RULE_INIT: 1484 /* Rule 0: remember if hiscore is not ready yet */ 1485 ret = !!score->ifa; 1486 break; 1487 case IPV6_SADDR_RULE_LOCAL: 1488 /* Rule 1: Prefer same address */ 1489 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1490 break; 1491 case IPV6_SADDR_RULE_SCOPE: 1492 /* Rule 2: Prefer appropriate scope 1493 * 1494 * ret 1495 * ^ 1496 * -1 | d 15 1497 * ---+--+-+---> scope 1498 * | 1499 * | d is scope of the destination. 1500 * B-d | \ 1501 * | \ <- smaller scope is better if 1502 * B-15 | \ if scope is enough for destination. 1503 * | ret = B - scope (-1 <= scope >= d <= 15). 1504 * d-C-1 | / 1505 * |/ <- greater is better 1506 * -C / if scope is not enough for destination. 1507 * /| ret = scope - C (-1 <= d < scope <= 15). 1508 * 1509 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1510 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1511 * Assume B = 0 and we get C > 29. 1512 */ 1513 ret = __ipv6_addr_src_scope(score->addr_type); 1514 if (ret >= dst->scope) 1515 ret = -ret; 1516 else 1517 ret -= 128; /* 30 is enough */ 1518 score->scopedist = ret; 1519 break; 1520 case IPV6_SADDR_RULE_PREFERRED: 1521 { 1522 /* Rule 3: Avoid deprecated and optimistic addresses */ 1523 u8 avoid = IFA_F_DEPRECATED; 1524 1525 if (!ipv6_use_optimistic_addr(net, score->ifa->idev)) 1526 avoid |= IFA_F_OPTIMISTIC; 1527 ret = ipv6_saddr_preferred(score->addr_type) || 1528 !(score->ifa->flags & avoid); 1529 break; 1530 } 1531 #ifdef CONFIG_IPV6_MIP6 1532 case IPV6_SADDR_RULE_HOA: 1533 { 1534 /* Rule 4: Prefer home address */ 1535 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1536 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1537 break; 1538 } 1539 #endif 1540 case IPV6_SADDR_RULE_OIF: 1541 /* Rule 5: Prefer outgoing interface */ 1542 ret = (!dst->ifindex || 1543 dst->ifindex == score->ifa->idev->dev->ifindex); 1544 break; 1545 case IPV6_SADDR_RULE_LABEL: 1546 /* Rule 6: Prefer matching label */ 1547 ret = ipv6_addr_label(net, 1548 &score->ifa->addr, score->addr_type, 1549 score->ifa->idev->dev->ifindex) == dst->label; 1550 break; 1551 case IPV6_SADDR_RULE_PRIVACY: 1552 { 1553 /* Rule 7: Prefer public address 1554 * Note: prefer temporary address if use_tempaddr >= 2 1555 */ 1556 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1557 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1558 score->ifa->idev->cnf.use_tempaddr >= 2; 1559 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1560 break; 1561 } 1562 case IPV6_SADDR_RULE_ORCHID: 1563 /* Rule 8-: Prefer ORCHID vs ORCHID or 1564 * non-ORCHID vs non-ORCHID 1565 */ 1566 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1567 ipv6_addr_orchid(dst->addr)); 1568 break; 1569 case IPV6_SADDR_RULE_PREFIX: 1570 /* Rule 8: Use longest matching prefix */ 1571 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1572 if (ret > score->ifa->prefix_len) 1573 ret = score->ifa->prefix_len; 1574 score->matchlen = ret; 1575 break; 1576 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1577 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1578 /* Optimistic addresses still have lower precedence than other 1579 * preferred addresses. 1580 */ 1581 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1582 break; 1583 #endif 1584 default: 1585 ret = 0; 1586 } 1587 1588 if (ret) 1589 __set_bit(i, score->scorebits); 1590 score->rule = i; 1591 out: 1592 return ret; 1593 } 1594 1595 static int __ipv6_dev_get_saddr(struct net *net, 1596 struct ipv6_saddr_dst *dst, 1597 struct inet6_dev *idev, 1598 struct ipv6_saddr_score *scores, 1599 int hiscore_idx) 1600 { 1601 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1602 1603 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) { 1604 int i; 1605 1606 /* 1607 * - Tentative Address (RFC2462 section 5.4) 1608 * - A tentative address is not considered 1609 * "assigned to an interface" in the traditional 1610 * sense, unless it is also flagged as optimistic. 1611 * - Candidate Source Address (section 4) 1612 * - In any case, anycast addresses, multicast 1613 * addresses, and the unspecified address MUST 1614 * NOT be included in a candidate set. 1615 */ 1616 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1617 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1618 continue; 1619 1620 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1621 1622 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1623 score->addr_type & IPV6_ADDR_MULTICAST)) { 1624 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1625 idev->dev->name); 1626 continue; 1627 } 1628 1629 score->rule = -1; 1630 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1631 1632 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1633 int minihiscore, miniscore; 1634 1635 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1636 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1637 1638 if (minihiscore > miniscore) { 1639 if (i == IPV6_SADDR_RULE_SCOPE && 1640 score->scopedist > 0) { 1641 /* 1642 * special case: 1643 * each remaining entry 1644 * has too small (not enough) 1645 * scope, because ifa entries 1646 * are sorted by their scope 1647 * values. 1648 */ 1649 goto out; 1650 } 1651 break; 1652 } else if (minihiscore < miniscore) { 1653 swap(hiscore, score); 1654 hiscore_idx = 1 - hiscore_idx; 1655 1656 /* restore our iterator */ 1657 score->ifa = hiscore->ifa; 1658 1659 break; 1660 } 1661 } 1662 } 1663 out: 1664 return hiscore_idx; 1665 } 1666 1667 static int ipv6_get_saddr_master(struct net *net, 1668 const struct net_device *dst_dev, 1669 const struct net_device *master, 1670 struct ipv6_saddr_dst *dst, 1671 struct ipv6_saddr_score *scores, 1672 int hiscore_idx) 1673 { 1674 struct inet6_dev *idev; 1675 1676 idev = __in6_dev_get(dst_dev); 1677 if (idev) 1678 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1679 scores, hiscore_idx); 1680 1681 idev = __in6_dev_get(master); 1682 if (idev) 1683 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1684 scores, hiscore_idx); 1685 1686 return hiscore_idx; 1687 } 1688 1689 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1690 const struct in6_addr *daddr, unsigned int prefs, 1691 struct in6_addr *saddr) 1692 { 1693 struct ipv6_saddr_score scores[2], *hiscore; 1694 struct ipv6_saddr_dst dst; 1695 struct inet6_dev *idev; 1696 struct net_device *dev; 1697 int dst_type; 1698 bool use_oif_addr = false; 1699 int hiscore_idx = 0; 1700 int ret = 0; 1701 1702 dst_type = __ipv6_addr_type(daddr); 1703 dst.addr = daddr; 1704 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1705 dst.scope = __ipv6_addr_src_scope(dst_type); 1706 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1707 dst.prefs = prefs; 1708 1709 scores[hiscore_idx].rule = -1; 1710 scores[hiscore_idx].ifa = NULL; 1711 1712 rcu_read_lock(); 1713 1714 /* Candidate Source Address (section 4) 1715 * - multicast and link-local destination address, 1716 * the set of candidate source address MUST only 1717 * include addresses assigned to interfaces 1718 * belonging to the same link as the outgoing 1719 * interface. 1720 * (- For site-local destination addresses, the 1721 * set of candidate source addresses MUST only 1722 * include addresses assigned to interfaces 1723 * belonging to the same site as the outgoing 1724 * interface.) 1725 * - "It is RECOMMENDED that the candidate source addresses 1726 * be the set of unicast addresses assigned to the 1727 * interface that will be used to send to the destination 1728 * (the 'outgoing' interface)." (RFC 6724) 1729 */ 1730 if (dst_dev) { 1731 idev = __in6_dev_get(dst_dev); 1732 if ((dst_type & IPV6_ADDR_MULTICAST) || 1733 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1734 (idev && idev->cnf.use_oif_addrs_only)) { 1735 use_oif_addr = true; 1736 } 1737 } 1738 1739 if (use_oif_addr) { 1740 if (idev) 1741 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1742 } else { 1743 const struct net_device *master; 1744 int master_idx = 0; 1745 1746 /* if dst_dev exists and is enslaved to an L3 device, then 1747 * prefer addresses from dst_dev and then the master over 1748 * any other enslaved devices in the L3 domain. 1749 */ 1750 master = l3mdev_master_dev_rcu(dst_dev); 1751 if (master) { 1752 master_idx = master->ifindex; 1753 1754 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1755 master, &dst, 1756 scores, hiscore_idx); 1757 1758 if (scores[hiscore_idx].ifa) 1759 goto out; 1760 } 1761 1762 for_each_netdev_rcu(net, dev) { 1763 /* only consider addresses on devices in the 1764 * same L3 domain 1765 */ 1766 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1767 continue; 1768 idev = __in6_dev_get(dev); 1769 if (!idev) 1770 continue; 1771 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1772 } 1773 } 1774 1775 out: 1776 hiscore = &scores[hiscore_idx]; 1777 if (!hiscore->ifa) 1778 ret = -EADDRNOTAVAIL; 1779 else 1780 *saddr = hiscore->ifa->addr; 1781 1782 rcu_read_unlock(); 1783 return ret; 1784 } 1785 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1786 1787 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1788 u32 banned_flags) 1789 { 1790 struct inet6_ifaddr *ifp; 1791 int err = -EADDRNOTAVAIL; 1792 1793 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1794 if (ifp->scope > IFA_LINK) 1795 break; 1796 if (ifp->scope == IFA_LINK && 1797 !(ifp->flags & banned_flags)) { 1798 *addr = ifp->addr; 1799 err = 0; 1800 break; 1801 } 1802 } 1803 return err; 1804 } 1805 1806 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1807 u32 banned_flags) 1808 { 1809 struct inet6_dev *idev; 1810 int err = -EADDRNOTAVAIL; 1811 1812 rcu_read_lock(); 1813 idev = __in6_dev_get(dev); 1814 if (idev) { 1815 read_lock_bh(&idev->lock); 1816 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1817 read_unlock_bh(&idev->lock); 1818 } 1819 rcu_read_unlock(); 1820 return err; 1821 } 1822 1823 static int ipv6_count_addresses(const struct inet6_dev *idev) 1824 { 1825 const struct inet6_ifaddr *ifp; 1826 int cnt = 0; 1827 1828 rcu_read_lock(); 1829 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list) 1830 cnt++; 1831 rcu_read_unlock(); 1832 return cnt; 1833 } 1834 1835 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1836 const struct net_device *dev, int strict) 1837 { 1838 return ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1839 strict, IFA_F_TENTATIVE); 1840 } 1841 EXPORT_SYMBOL(ipv6_chk_addr); 1842 1843 /* device argument is used to find the L3 domain of interest. If 1844 * skip_dev_check is set, then the ifp device is not checked against 1845 * the passed in dev argument. So the 2 cases for addresses checks are: 1846 * 1. does the address exist in the L3 domain that dev is part of 1847 * (skip_dev_check = true), or 1848 * 1849 * 2. does the address exist on the specific device 1850 * (skip_dev_check = false) 1851 */ 1852 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1853 const struct net_device *dev, bool skip_dev_check, 1854 int strict, u32 banned_flags) 1855 { 1856 unsigned int hash = inet6_addr_hash(net, addr); 1857 const struct net_device *l3mdev; 1858 struct inet6_ifaddr *ifp; 1859 u32 ifp_flags; 1860 1861 rcu_read_lock(); 1862 1863 l3mdev = l3mdev_master_dev_rcu(dev); 1864 if (skip_dev_check) 1865 dev = NULL; 1866 1867 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1868 if (!net_eq(dev_net(ifp->idev->dev), net)) 1869 continue; 1870 1871 if (l3mdev_master_dev_rcu(ifp->idev->dev) != l3mdev) 1872 continue; 1873 1874 /* Decouple optimistic from tentative for evaluation here. 1875 * Ban optimistic addresses explicitly, when required. 1876 */ 1877 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1878 ? (ifp->flags&~IFA_F_TENTATIVE) 1879 : ifp->flags; 1880 if (ipv6_addr_equal(&ifp->addr, addr) && 1881 !(ifp_flags&banned_flags) && 1882 (!dev || ifp->idev->dev == dev || 1883 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1884 rcu_read_unlock(); 1885 return 1; 1886 } 1887 } 1888 1889 rcu_read_unlock(); 1890 return 0; 1891 } 1892 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1893 1894 1895 /* Compares an address/prefix_len with addresses on device @dev. 1896 * If one is found it returns true. 1897 */ 1898 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1899 const unsigned int prefix_len, struct net_device *dev) 1900 { 1901 const struct inet6_ifaddr *ifa; 1902 const struct inet6_dev *idev; 1903 bool ret = false; 1904 1905 rcu_read_lock(); 1906 idev = __in6_dev_get(dev); 1907 if (idev) { 1908 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1909 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1910 if (ret) 1911 break; 1912 } 1913 } 1914 rcu_read_unlock(); 1915 1916 return ret; 1917 } 1918 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1919 1920 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1921 { 1922 const struct inet6_ifaddr *ifa; 1923 const struct inet6_dev *idev; 1924 int onlink; 1925 1926 onlink = 0; 1927 rcu_read_lock(); 1928 idev = __in6_dev_get(dev); 1929 if (idev) { 1930 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1931 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1932 ifa->prefix_len); 1933 if (onlink) 1934 break; 1935 } 1936 } 1937 rcu_read_unlock(); 1938 return onlink; 1939 } 1940 EXPORT_SYMBOL(ipv6_chk_prefix); 1941 1942 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1943 struct net_device *dev, int strict) 1944 { 1945 unsigned int hash = inet6_addr_hash(net, addr); 1946 struct inet6_ifaddr *ifp, *result = NULL; 1947 1948 rcu_read_lock(); 1949 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1950 if (!net_eq(dev_net(ifp->idev->dev), net)) 1951 continue; 1952 if (ipv6_addr_equal(&ifp->addr, addr)) { 1953 if (!dev || ifp->idev->dev == dev || 1954 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1955 result = ifp; 1956 in6_ifa_hold(ifp); 1957 break; 1958 } 1959 } 1960 } 1961 rcu_read_unlock(); 1962 1963 return result; 1964 } 1965 1966 /* Gets referenced address, destroys ifaddr */ 1967 1968 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1969 { 1970 if (dad_failed) 1971 ifp->flags |= IFA_F_DADFAILED; 1972 1973 if (ifp->flags&IFA_F_TEMPORARY) { 1974 struct inet6_ifaddr *ifpub; 1975 spin_lock_bh(&ifp->lock); 1976 ifpub = ifp->ifpub; 1977 if (ifpub) { 1978 in6_ifa_hold(ifpub); 1979 spin_unlock_bh(&ifp->lock); 1980 ipv6_create_tempaddr(ifpub, ifp, true); 1981 in6_ifa_put(ifpub); 1982 } else { 1983 spin_unlock_bh(&ifp->lock); 1984 } 1985 ipv6_del_addr(ifp); 1986 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) { 1987 spin_lock_bh(&ifp->lock); 1988 addrconf_del_dad_work(ifp); 1989 ifp->flags |= IFA_F_TENTATIVE; 1990 if (dad_failed) 1991 ifp->flags &= ~IFA_F_OPTIMISTIC; 1992 spin_unlock_bh(&ifp->lock); 1993 if (dad_failed) 1994 ipv6_ifa_notify(0, ifp); 1995 in6_ifa_put(ifp); 1996 } else { 1997 ipv6_del_addr(ifp); 1998 } 1999 } 2000 2001 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 2002 { 2003 int err = -ENOENT; 2004 2005 spin_lock_bh(&ifp->lock); 2006 if (ifp->state == INET6_IFADDR_STATE_DAD) { 2007 ifp->state = INET6_IFADDR_STATE_POSTDAD; 2008 err = 0; 2009 } 2010 spin_unlock_bh(&ifp->lock); 2011 2012 return err; 2013 } 2014 2015 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp) 2016 { 2017 struct inet6_dev *idev = ifp->idev; 2018 struct net *net = dev_net(ifp->idev->dev); 2019 2020 if (addrconf_dad_end(ifp)) { 2021 in6_ifa_put(ifp); 2022 return; 2023 } 2024 2025 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n", 2026 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source); 2027 2028 spin_lock_bh(&ifp->lock); 2029 2030 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 2031 struct in6_addr new_addr; 2032 struct inet6_ifaddr *ifp2; 2033 int retries = ifp->stable_privacy_retry + 1; 2034 struct ifa6_config cfg = { 2035 .pfx = &new_addr, 2036 .plen = ifp->prefix_len, 2037 .ifa_flags = ifp->flags, 2038 .valid_lft = ifp->valid_lft, 2039 .preferred_lft = ifp->prefered_lft, 2040 .scope = ifp->scope, 2041 }; 2042 2043 if (retries > net->ipv6.sysctl.idgen_retries) { 2044 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 2045 ifp->idev->dev->name); 2046 goto errdad; 2047 } 2048 2049 new_addr = ifp->addr; 2050 if (ipv6_generate_stable_address(&new_addr, retries, 2051 idev)) 2052 goto errdad; 2053 2054 spin_unlock_bh(&ifp->lock); 2055 2056 if (idev->cnf.max_addresses && 2057 ipv6_count_addresses(idev) >= 2058 idev->cnf.max_addresses) 2059 goto lock_errdad; 2060 2061 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 2062 ifp->idev->dev->name); 2063 2064 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL); 2065 if (IS_ERR(ifp2)) 2066 goto lock_errdad; 2067 2068 spin_lock_bh(&ifp2->lock); 2069 ifp2->stable_privacy_retry = retries; 2070 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2071 spin_unlock_bh(&ifp2->lock); 2072 2073 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2074 in6_ifa_put(ifp2); 2075 lock_errdad: 2076 spin_lock_bh(&ifp->lock); 2077 } 2078 2079 errdad: 2080 /* transition from _POSTDAD to _ERRDAD */ 2081 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2082 spin_unlock_bh(&ifp->lock); 2083 2084 addrconf_mod_dad_work(ifp, 0); 2085 in6_ifa_put(ifp); 2086 } 2087 2088 /* Join to solicited addr multicast group. 2089 * caller must hold RTNL */ 2090 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2091 { 2092 struct in6_addr maddr; 2093 2094 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2095 return; 2096 2097 addrconf_addr_solict_mult(addr, &maddr); 2098 ipv6_dev_mc_inc(dev, &maddr); 2099 } 2100 2101 /* caller must hold RTNL */ 2102 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2103 { 2104 struct in6_addr maddr; 2105 2106 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2107 return; 2108 2109 addrconf_addr_solict_mult(addr, &maddr); 2110 __ipv6_dev_mc_dec(idev, &maddr); 2111 } 2112 2113 /* caller must hold RTNL */ 2114 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2115 { 2116 struct in6_addr addr; 2117 2118 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2119 return; 2120 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2121 if (ipv6_addr_any(&addr)) 2122 return; 2123 __ipv6_dev_ac_inc(ifp->idev, &addr); 2124 } 2125 2126 /* caller must hold RTNL */ 2127 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2128 { 2129 struct in6_addr addr; 2130 2131 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2132 return; 2133 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2134 if (ipv6_addr_any(&addr)) 2135 return; 2136 __ipv6_dev_ac_dec(ifp->idev, &addr); 2137 } 2138 2139 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2140 { 2141 switch (dev->addr_len) { 2142 case ETH_ALEN: 2143 memcpy(eui, dev->dev_addr, 3); 2144 eui[3] = 0xFF; 2145 eui[4] = 0xFE; 2146 memcpy(eui + 5, dev->dev_addr + 3, 3); 2147 break; 2148 case EUI64_ADDR_LEN: 2149 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2150 eui[0] ^= 2; 2151 break; 2152 default: 2153 return -1; 2154 } 2155 2156 return 0; 2157 } 2158 2159 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2160 { 2161 union fwnet_hwaddr *ha; 2162 2163 if (dev->addr_len != FWNET_ALEN) 2164 return -1; 2165 2166 ha = (union fwnet_hwaddr *)dev->dev_addr; 2167 2168 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2169 eui[0] ^= 2; 2170 return 0; 2171 } 2172 2173 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2174 { 2175 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2176 if (dev->addr_len != ARCNET_ALEN) 2177 return -1; 2178 memset(eui, 0, 7); 2179 eui[7] = *(u8 *)dev->dev_addr; 2180 return 0; 2181 } 2182 2183 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2184 { 2185 if (dev->addr_len != INFINIBAND_ALEN) 2186 return -1; 2187 memcpy(eui, dev->dev_addr + 12, 8); 2188 eui[0] |= 2; 2189 return 0; 2190 } 2191 2192 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2193 { 2194 if (addr == 0) 2195 return -1; 2196 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2197 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2198 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2199 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2200 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2201 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2202 eui[1] = 0; 2203 eui[2] = 0x5E; 2204 eui[3] = 0xFE; 2205 memcpy(eui + 4, &addr, 4); 2206 return 0; 2207 } 2208 2209 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2210 { 2211 if (dev->priv_flags & IFF_ISATAP) 2212 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2213 return -1; 2214 } 2215 2216 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2217 { 2218 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2219 } 2220 2221 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2222 { 2223 memcpy(eui, dev->perm_addr, 3); 2224 memcpy(eui + 5, dev->perm_addr + 3, 3); 2225 eui[3] = 0xFF; 2226 eui[4] = 0xFE; 2227 eui[0] ^= 2; 2228 return 0; 2229 } 2230 2231 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2232 { 2233 switch (dev->type) { 2234 case ARPHRD_ETHER: 2235 case ARPHRD_FDDI: 2236 return addrconf_ifid_eui48(eui, dev); 2237 case ARPHRD_ARCNET: 2238 return addrconf_ifid_arcnet(eui, dev); 2239 case ARPHRD_INFINIBAND: 2240 return addrconf_ifid_infiniband(eui, dev); 2241 case ARPHRD_SIT: 2242 return addrconf_ifid_sit(eui, dev); 2243 case ARPHRD_IPGRE: 2244 case ARPHRD_TUNNEL: 2245 return addrconf_ifid_gre(eui, dev); 2246 case ARPHRD_6LOWPAN: 2247 return addrconf_ifid_6lowpan(eui, dev); 2248 case ARPHRD_IEEE1394: 2249 return addrconf_ifid_ieee1394(eui, dev); 2250 case ARPHRD_TUNNEL6: 2251 case ARPHRD_IP6GRE: 2252 case ARPHRD_RAWIP: 2253 return addrconf_ifid_ip6tnl(eui, dev); 2254 } 2255 return -1; 2256 } 2257 2258 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2259 { 2260 int err = -1; 2261 struct inet6_ifaddr *ifp; 2262 2263 read_lock_bh(&idev->lock); 2264 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2265 if (ifp->scope > IFA_LINK) 2266 break; 2267 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2268 memcpy(eui, ifp->addr.s6_addr+8, 8); 2269 err = 0; 2270 break; 2271 } 2272 } 2273 read_unlock_bh(&idev->lock); 2274 return err; 2275 } 2276 2277 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 2278 static void ipv6_regen_rndid(struct inet6_dev *idev) 2279 { 2280 regen: 2281 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 2282 idev->rndid[0] &= ~0x02; 2283 2284 /* 2285 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 2286 * check if generated address is not inappropriate 2287 * 2288 * - Reserved subnet anycast (RFC 2526) 2289 * 11111101 11....11 1xxxxxxx 2290 * - ISATAP (RFC4214) 6.1 2291 * 00-00-5E-FE-xx-xx-xx-xx 2292 * - value 0 2293 * - XXX: already assigned to an address on the device 2294 */ 2295 if (idev->rndid[0] == 0xfd && 2296 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 2297 (idev->rndid[7]&0x80)) 2298 goto regen; 2299 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 2300 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 2301 goto regen; 2302 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 2303 goto regen; 2304 } 2305 } 2306 2307 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 2308 { 2309 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 2310 ipv6_regen_rndid(idev); 2311 } 2312 2313 /* 2314 * Add prefix route. 2315 */ 2316 2317 static void 2318 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric, 2319 struct net_device *dev, unsigned long expires, 2320 u32 flags, gfp_t gfp_flags) 2321 { 2322 struct fib6_config cfg = { 2323 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2324 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF, 2325 .fc_ifindex = dev->ifindex, 2326 .fc_expires = expires, 2327 .fc_dst_len = plen, 2328 .fc_flags = RTF_UP | flags, 2329 .fc_nlinfo.nl_net = dev_net(dev), 2330 .fc_protocol = RTPROT_KERNEL, 2331 .fc_type = RTN_UNICAST, 2332 }; 2333 2334 cfg.fc_dst = *pfx; 2335 2336 /* Prevent useless cloning on PtP SIT. 2337 This thing is done here expecting that the whole 2338 class of non-broadcast devices need not cloning. 2339 */ 2340 #if IS_ENABLED(CONFIG_IPV6_SIT) 2341 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2342 cfg.fc_flags |= RTF_NONEXTHOP; 2343 #endif 2344 2345 ip6_route_add(&cfg, gfp_flags, NULL); 2346 } 2347 2348 2349 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2350 int plen, 2351 const struct net_device *dev, 2352 u32 flags, u32 noflags) 2353 { 2354 struct fib6_node *fn; 2355 struct fib6_info *rt = NULL; 2356 struct fib6_table *table; 2357 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2358 2359 table = fib6_get_table(dev_net(dev), tb_id); 2360 if (!table) 2361 return NULL; 2362 2363 rcu_read_lock(); 2364 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true); 2365 if (!fn) 2366 goto out; 2367 2368 for_each_fib6_node_rt_rcu(fn) { 2369 if (rt->fib6_nh.nh_dev->ifindex != dev->ifindex) 2370 continue; 2371 if ((rt->fib6_flags & flags) != flags) 2372 continue; 2373 if ((rt->fib6_flags & noflags) != 0) 2374 continue; 2375 fib6_info_hold(rt); 2376 break; 2377 } 2378 out: 2379 rcu_read_unlock(); 2380 return rt; 2381 } 2382 2383 2384 /* Create "default" multicast route to the interface */ 2385 2386 static void addrconf_add_mroute(struct net_device *dev) 2387 { 2388 struct fib6_config cfg = { 2389 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2390 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2391 .fc_ifindex = dev->ifindex, 2392 .fc_dst_len = 8, 2393 .fc_flags = RTF_UP, 2394 .fc_type = RTN_UNICAST, 2395 .fc_nlinfo.nl_net = dev_net(dev), 2396 }; 2397 2398 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2399 2400 ip6_route_add(&cfg, GFP_ATOMIC, NULL); 2401 } 2402 2403 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2404 { 2405 struct inet6_dev *idev; 2406 2407 ASSERT_RTNL(); 2408 2409 idev = ipv6_find_idev(dev); 2410 if (!idev) 2411 return ERR_PTR(-ENOBUFS); 2412 2413 if (idev->cnf.disable_ipv6) 2414 return ERR_PTR(-EACCES); 2415 2416 /* Add default multicast route */ 2417 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2418 addrconf_add_mroute(dev); 2419 2420 return idev; 2421 } 2422 2423 static void manage_tempaddrs(struct inet6_dev *idev, 2424 struct inet6_ifaddr *ifp, 2425 __u32 valid_lft, __u32 prefered_lft, 2426 bool create, unsigned long now) 2427 { 2428 u32 flags; 2429 struct inet6_ifaddr *ift; 2430 2431 read_lock_bh(&idev->lock); 2432 /* update all temporary addresses in the list */ 2433 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2434 int age, max_valid, max_prefered; 2435 2436 if (ifp != ift->ifpub) 2437 continue; 2438 2439 /* RFC 4941 section 3.3: 2440 * If a received option will extend the lifetime of a public 2441 * address, the lifetimes of temporary addresses should 2442 * be extended, subject to the overall constraint that no 2443 * temporary addresses should ever remain "valid" or "preferred" 2444 * for a time longer than (TEMP_VALID_LIFETIME) or 2445 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2446 */ 2447 age = (now - ift->cstamp) / HZ; 2448 max_valid = idev->cnf.temp_valid_lft - age; 2449 if (max_valid < 0) 2450 max_valid = 0; 2451 2452 max_prefered = idev->cnf.temp_prefered_lft - 2453 idev->desync_factor - age; 2454 if (max_prefered < 0) 2455 max_prefered = 0; 2456 2457 if (valid_lft > max_valid) 2458 valid_lft = max_valid; 2459 2460 if (prefered_lft > max_prefered) 2461 prefered_lft = max_prefered; 2462 2463 spin_lock(&ift->lock); 2464 flags = ift->flags; 2465 ift->valid_lft = valid_lft; 2466 ift->prefered_lft = prefered_lft; 2467 ift->tstamp = now; 2468 if (prefered_lft > 0) 2469 ift->flags &= ~IFA_F_DEPRECATED; 2470 2471 spin_unlock(&ift->lock); 2472 if (!(flags&IFA_F_TENTATIVE)) 2473 ipv6_ifa_notify(0, ift); 2474 } 2475 2476 if ((create || list_empty(&idev->tempaddr_list)) && 2477 idev->cnf.use_tempaddr > 0) { 2478 /* When a new public address is created as described 2479 * in [ADDRCONF], also create a new temporary address. 2480 * Also create a temporary address if it's enabled but 2481 * no temporary address currently exists. 2482 */ 2483 read_unlock_bh(&idev->lock); 2484 ipv6_create_tempaddr(ifp, NULL, false); 2485 } else { 2486 read_unlock_bh(&idev->lock); 2487 } 2488 } 2489 2490 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2491 { 2492 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2493 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2494 } 2495 2496 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2497 const struct prefix_info *pinfo, 2498 struct inet6_dev *in6_dev, 2499 const struct in6_addr *addr, int addr_type, 2500 u32 addr_flags, bool sllao, bool tokenized, 2501 __u32 valid_lft, u32 prefered_lft) 2502 { 2503 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2504 int create = 0, update_lft = 0; 2505 2506 if (!ifp && valid_lft) { 2507 int max_addresses = in6_dev->cnf.max_addresses; 2508 struct ifa6_config cfg = { 2509 .pfx = addr, 2510 .plen = pinfo->prefix_len, 2511 .ifa_flags = addr_flags, 2512 .valid_lft = valid_lft, 2513 .preferred_lft = prefered_lft, 2514 .scope = addr_type & IPV6_ADDR_SCOPE_MASK, 2515 }; 2516 2517 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2518 if ((net->ipv6.devconf_all->optimistic_dad || 2519 in6_dev->cnf.optimistic_dad) && 2520 !net->ipv6.devconf_all->forwarding && sllao) 2521 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 2522 #endif 2523 2524 /* Do not allow to create too much of autoconfigured 2525 * addresses; this would be too easy way to crash kernel. 2526 */ 2527 if (!max_addresses || 2528 ipv6_count_addresses(in6_dev) < max_addresses) 2529 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL); 2530 2531 if (IS_ERR_OR_NULL(ifp)) 2532 return -1; 2533 2534 create = 1; 2535 spin_lock_bh(&ifp->lock); 2536 ifp->flags |= IFA_F_MANAGETEMPADDR; 2537 ifp->cstamp = jiffies; 2538 ifp->tokenized = tokenized; 2539 spin_unlock_bh(&ifp->lock); 2540 addrconf_dad_start(ifp); 2541 } 2542 2543 if (ifp) { 2544 u32 flags; 2545 unsigned long now; 2546 u32 stored_lft; 2547 2548 /* update lifetime (RFC2462 5.5.3 e) */ 2549 spin_lock_bh(&ifp->lock); 2550 now = jiffies; 2551 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2552 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2553 else 2554 stored_lft = 0; 2555 if (!create && stored_lft) { 2556 const u32 minimum_lft = min_t(u32, 2557 stored_lft, MIN_VALID_LIFETIME); 2558 valid_lft = max(valid_lft, minimum_lft); 2559 2560 /* RFC4862 Section 5.5.3e: 2561 * "Note that the preferred lifetime of the 2562 * corresponding address is always reset to 2563 * the Preferred Lifetime in the received 2564 * Prefix Information option, regardless of 2565 * whether the valid lifetime is also reset or 2566 * ignored." 2567 * 2568 * So we should always update prefered_lft here. 2569 */ 2570 update_lft = 1; 2571 } 2572 2573 if (update_lft) { 2574 ifp->valid_lft = valid_lft; 2575 ifp->prefered_lft = prefered_lft; 2576 ifp->tstamp = now; 2577 flags = ifp->flags; 2578 ifp->flags &= ~IFA_F_DEPRECATED; 2579 spin_unlock_bh(&ifp->lock); 2580 2581 if (!(flags&IFA_F_TENTATIVE)) 2582 ipv6_ifa_notify(0, ifp); 2583 } else 2584 spin_unlock_bh(&ifp->lock); 2585 2586 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2587 create, now); 2588 2589 in6_ifa_put(ifp); 2590 addrconf_verify(); 2591 } 2592 2593 return 0; 2594 } 2595 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2596 2597 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2598 { 2599 struct prefix_info *pinfo; 2600 __u32 valid_lft; 2601 __u32 prefered_lft; 2602 int addr_type, err; 2603 u32 addr_flags = 0; 2604 struct inet6_dev *in6_dev; 2605 struct net *net = dev_net(dev); 2606 2607 pinfo = (struct prefix_info *) opt; 2608 2609 if (len < sizeof(struct prefix_info)) { 2610 netdev_dbg(dev, "addrconf: prefix option too short\n"); 2611 return; 2612 } 2613 2614 /* 2615 * Validation checks ([ADDRCONF], page 19) 2616 */ 2617 2618 addr_type = ipv6_addr_type(&pinfo->prefix); 2619 2620 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2621 return; 2622 2623 valid_lft = ntohl(pinfo->valid); 2624 prefered_lft = ntohl(pinfo->prefered); 2625 2626 if (prefered_lft > valid_lft) { 2627 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2628 return; 2629 } 2630 2631 in6_dev = in6_dev_get(dev); 2632 2633 if (!in6_dev) { 2634 net_dbg_ratelimited("addrconf: device %s not configured\n", 2635 dev->name); 2636 return; 2637 } 2638 2639 /* 2640 * Two things going on here: 2641 * 1) Add routes for on-link prefixes 2642 * 2) Configure prefixes with the auto flag set 2643 */ 2644 2645 if (pinfo->onlink) { 2646 struct fib6_info *rt; 2647 unsigned long rt_expires; 2648 2649 /* Avoid arithmetic overflow. Really, we could 2650 * save rt_expires in seconds, likely valid_lft, 2651 * but it would require division in fib gc, that it 2652 * not good. 2653 */ 2654 if (HZ > USER_HZ) 2655 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2656 else 2657 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2658 2659 if (addrconf_finite_timeout(rt_expires)) 2660 rt_expires *= HZ; 2661 2662 rt = addrconf_get_prefix_route(&pinfo->prefix, 2663 pinfo->prefix_len, 2664 dev, 2665 RTF_ADDRCONF | RTF_PREFIX_RT, 2666 RTF_GATEWAY | RTF_DEFAULT); 2667 2668 if (rt) { 2669 /* Autoconf prefix route */ 2670 if (valid_lft == 0) { 2671 ip6_del_rt(net, rt); 2672 rt = NULL; 2673 } else if (addrconf_finite_timeout(rt_expires)) { 2674 /* not infinity */ 2675 fib6_set_expires(rt, jiffies + rt_expires); 2676 } else { 2677 fib6_clean_expires(rt); 2678 } 2679 } else if (valid_lft) { 2680 clock_t expires = 0; 2681 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2682 if (addrconf_finite_timeout(rt_expires)) { 2683 /* not infinity */ 2684 flags |= RTF_EXPIRES; 2685 expires = jiffies_to_clock_t(rt_expires); 2686 } 2687 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2688 0, dev, expires, flags, 2689 GFP_ATOMIC); 2690 } 2691 fib6_info_release(rt); 2692 } 2693 2694 /* Try to figure out our local address for this prefix */ 2695 2696 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2697 struct in6_addr addr; 2698 bool tokenized = false, dev_addr_generated = false; 2699 2700 if (pinfo->prefix_len == 64) { 2701 memcpy(&addr, &pinfo->prefix, 8); 2702 2703 if (!ipv6_addr_any(&in6_dev->token)) { 2704 read_lock_bh(&in6_dev->lock); 2705 memcpy(addr.s6_addr + 8, 2706 in6_dev->token.s6_addr + 8, 8); 2707 read_unlock_bh(&in6_dev->lock); 2708 tokenized = true; 2709 } else if (is_addr_mode_generate_stable(in6_dev) && 2710 !ipv6_generate_stable_address(&addr, 0, 2711 in6_dev)) { 2712 addr_flags |= IFA_F_STABLE_PRIVACY; 2713 goto ok; 2714 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2715 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2716 goto put; 2717 } else { 2718 dev_addr_generated = true; 2719 } 2720 goto ok; 2721 } 2722 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2723 pinfo->prefix_len); 2724 goto put; 2725 2726 ok: 2727 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2728 &addr, addr_type, 2729 addr_flags, sllao, 2730 tokenized, valid_lft, 2731 prefered_lft); 2732 if (err) 2733 goto put; 2734 2735 /* Ignore error case here because previous prefix add addr was 2736 * successful which will be notified. 2737 */ 2738 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2739 addr_type, addr_flags, sllao, 2740 tokenized, valid_lft, 2741 prefered_lft, 2742 dev_addr_generated); 2743 } 2744 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2745 put: 2746 in6_dev_put(in6_dev); 2747 } 2748 2749 /* 2750 * Set destination address. 2751 * Special case for SIT interfaces where we create a new "virtual" 2752 * device. 2753 */ 2754 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2755 { 2756 struct in6_ifreq ireq; 2757 struct net_device *dev; 2758 int err = -EINVAL; 2759 2760 rtnl_lock(); 2761 2762 err = -EFAULT; 2763 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2764 goto err_exit; 2765 2766 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2767 2768 err = -ENODEV; 2769 if (!dev) 2770 goto err_exit; 2771 2772 #if IS_ENABLED(CONFIG_IPV6_SIT) 2773 if (dev->type == ARPHRD_SIT) { 2774 const struct net_device_ops *ops = dev->netdev_ops; 2775 struct ifreq ifr; 2776 struct ip_tunnel_parm p; 2777 2778 err = -EADDRNOTAVAIL; 2779 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2780 goto err_exit; 2781 2782 memset(&p, 0, sizeof(p)); 2783 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2784 p.iph.saddr = 0; 2785 p.iph.version = 4; 2786 p.iph.ihl = 5; 2787 p.iph.protocol = IPPROTO_IPV6; 2788 p.iph.ttl = 64; 2789 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2790 2791 if (ops->ndo_do_ioctl) { 2792 mm_segment_t oldfs = get_fs(); 2793 2794 set_fs(KERNEL_DS); 2795 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2796 set_fs(oldfs); 2797 } else 2798 err = -EOPNOTSUPP; 2799 2800 if (err == 0) { 2801 err = -ENOBUFS; 2802 dev = __dev_get_by_name(net, p.name); 2803 if (!dev) 2804 goto err_exit; 2805 err = dev_open(dev); 2806 } 2807 } 2808 #endif 2809 2810 err_exit: 2811 rtnl_unlock(); 2812 return err; 2813 } 2814 2815 static int ipv6_mc_config(struct sock *sk, bool join, 2816 const struct in6_addr *addr, int ifindex) 2817 { 2818 int ret; 2819 2820 ASSERT_RTNL(); 2821 2822 lock_sock(sk); 2823 if (join) 2824 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2825 else 2826 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2827 release_sock(sk); 2828 2829 return ret; 2830 } 2831 2832 /* 2833 * Manual configuration of address on an interface 2834 */ 2835 static int inet6_addr_add(struct net *net, int ifindex, 2836 struct ifa6_config *cfg, 2837 struct netlink_ext_ack *extack) 2838 { 2839 struct inet6_ifaddr *ifp; 2840 struct inet6_dev *idev; 2841 struct net_device *dev; 2842 unsigned long timeout; 2843 clock_t expires; 2844 u32 flags; 2845 2846 ASSERT_RTNL(); 2847 2848 if (cfg->plen > 128) 2849 return -EINVAL; 2850 2851 /* check the lifetime */ 2852 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 2853 return -EINVAL; 2854 2855 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) 2856 return -EINVAL; 2857 2858 dev = __dev_get_by_index(net, ifindex); 2859 if (!dev) 2860 return -ENODEV; 2861 2862 idev = addrconf_add_dev(dev); 2863 if (IS_ERR(idev)) 2864 return PTR_ERR(idev); 2865 2866 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2867 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2868 true, cfg->pfx, ifindex); 2869 2870 if (ret < 0) 2871 return ret; 2872 } 2873 2874 cfg->scope = ipv6_addr_scope(cfg->pfx); 2875 2876 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 2877 if (addrconf_finite_timeout(timeout)) { 2878 expires = jiffies_to_clock_t(timeout * HZ); 2879 cfg->valid_lft = timeout; 2880 flags = RTF_EXPIRES; 2881 } else { 2882 expires = 0; 2883 flags = 0; 2884 cfg->ifa_flags |= IFA_F_PERMANENT; 2885 } 2886 2887 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 2888 if (addrconf_finite_timeout(timeout)) { 2889 if (timeout == 0) 2890 cfg->ifa_flags |= IFA_F_DEPRECATED; 2891 cfg->preferred_lft = timeout; 2892 } 2893 2894 ifp = ipv6_add_addr(idev, cfg, true, extack); 2895 if (!IS_ERR(ifp)) { 2896 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 2897 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 2898 ifp->rt_priority, dev, expires, 2899 flags, GFP_KERNEL); 2900 } 2901 2902 /* Send a netlink notification if DAD is enabled and 2903 * optimistic flag is not set 2904 */ 2905 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD))) 2906 ipv6_ifa_notify(0, ifp); 2907 /* 2908 * Note that section 3.1 of RFC 4429 indicates 2909 * that the Optimistic flag should not be set for 2910 * manually configured addresses 2911 */ 2912 addrconf_dad_start(ifp); 2913 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR) 2914 manage_tempaddrs(idev, ifp, cfg->valid_lft, 2915 cfg->preferred_lft, true, jiffies); 2916 in6_ifa_put(ifp); 2917 addrconf_verify_rtnl(); 2918 return 0; 2919 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2920 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false, 2921 cfg->pfx, ifindex); 2922 } 2923 2924 return PTR_ERR(ifp); 2925 } 2926 2927 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2928 const struct in6_addr *pfx, unsigned int plen) 2929 { 2930 struct inet6_ifaddr *ifp; 2931 struct inet6_dev *idev; 2932 struct net_device *dev; 2933 2934 if (plen > 128) 2935 return -EINVAL; 2936 2937 dev = __dev_get_by_index(net, ifindex); 2938 if (!dev) 2939 return -ENODEV; 2940 2941 idev = __in6_dev_get(dev); 2942 if (!idev) 2943 return -ENXIO; 2944 2945 read_lock_bh(&idev->lock); 2946 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2947 if (ifp->prefix_len == plen && 2948 ipv6_addr_equal(pfx, &ifp->addr)) { 2949 in6_ifa_hold(ifp); 2950 read_unlock_bh(&idev->lock); 2951 2952 if (!(ifp->flags & IFA_F_TEMPORARY) && 2953 (ifa_flags & IFA_F_MANAGETEMPADDR)) 2954 manage_tempaddrs(idev, ifp, 0, 0, false, 2955 jiffies); 2956 ipv6_del_addr(ifp); 2957 addrconf_verify_rtnl(); 2958 if (ipv6_addr_is_multicast(pfx)) { 2959 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2960 false, pfx, dev->ifindex); 2961 } 2962 return 0; 2963 } 2964 } 2965 read_unlock_bh(&idev->lock); 2966 return -EADDRNOTAVAIL; 2967 } 2968 2969 2970 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2971 { 2972 struct ifa6_config cfg = { 2973 .ifa_flags = IFA_F_PERMANENT, 2974 .preferred_lft = INFINITY_LIFE_TIME, 2975 .valid_lft = INFINITY_LIFE_TIME, 2976 }; 2977 struct in6_ifreq ireq; 2978 int err; 2979 2980 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2981 return -EPERM; 2982 2983 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2984 return -EFAULT; 2985 2986 cfg.pfx = &ireq.ifr6_addr; 2987 cfg.plen = ireq.ifr6_prefixlen; 2988 2989 rtnl_lock(); 2990 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL); 2991 rtnl_unlock(); 2992 return err; 2993 } 2994 2995 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2996 { 2997 struct in6_ifreq ireq; 2998 int err; 2999 3000 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3001 return -EPERM; 3002 3003 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3004 return -EFAULT; 3005 3006 rtnl_lock(); 3007 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 3008 ireq.ifr6_prefixlen); 3009 rtnl_unlock(); 3010 return err; 3011 } 3012 3013 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 3014 int plen, int scope) 3015 { 3016 struct inet6_ifaddr *ifp; 3017 struct ifa6_config cfg = { 3018 .pfx = addr, 3019 .plen = plen, 3020 .ifa_flags = IFA_F_PERMANENT, 3021 .valid_lft = INFINITY_LIFE_TIME, 3022 .preferred_lft = INFINITY_LIFE_TIME, 3023 .scope = scope 3024 }; 3025 3026 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3027 if (!IS_ERR(ifp)) { 3028 spin_lock_bh(&ifp->lock); 3029 ifp->flags &= ~IFA_F_TENTATIVE; 3030 spin_unlock_bh(&ifp->lock); 3031 rt_genid_bump_ipv6(dev_net(idev->dev)); 3032 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3033 in6_ifa_put(ifp); 3034 } 3035 } 3036 3037 #if IS_ENABLED(CONFIG_IPV6_SIT) 3038 static void sit_add_v4_addrs(struct inet6_dev *idev) 3039 { 3040 struct in6_addr addr; 3041 struct net_device *dev; 3042 struct net *net = dev_net(idev->dev); 3043 int scope, plen; 3044 u32 pflags = 0; 3045 3046 ASSERT_RTNL(); 3047 3048 memset(&addr, 0, sizeof(struct in6_addr)); 3049 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 3050 3051 if (idev->dev->flags&IFF_POINTOPOINT) { 3052 addr.s6_addr32[0] = htonl(0xfe800000); 3053 scope = IFA_LINK; 3054 plen = 64; 3055 } else { 3056 scope = IPV6_ADDR_COMPATv4; 3057 plen = 96; 3058 pflags |= RTF_NONEXTHOP; 3059 } 3060 3061 if (addr.s6_addr32[3]) { 3062 add_addr(idev, &addr, plen, scope); 3063 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags, 3064 GFP_ATOMIC); 3065 return; 3066 } 3067 3068 for_each_netdev(net, dev) { 3069 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3070 if (in_dev && (dev->flags & IFF_UP)) { 3071 struct in_ifaddr *ifa; 3072 3073 int flag = scope; 3074 3075 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 3076 3077 addr.s6_addr32[3] = ifa->ifa_local; 3078 3079 if (ifa->ifa_scope == RT_SCOPE_LINK) 3080 continue; 3081 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3082 if (idev->dev->flags&IFF_POINTOPOINT) 3083 continue; 3084 flag |= IFA_HOST; 3085 } 3086 3087 add_addr(idev, &addr, plen, flag); 3088 addrconf_prefix_route(&addr, plen, 0, idev->dev, 3089 0, pflags, GFP_ATOMIC); 3090 } 3091 } 3092 } 3093 } 3094 #endif 3095 3096 static void init_loopback(struct net_device *dev) 3097 { 3098 struct inet6_dev *idev; 3099 3100 /* ::1 */ 3101 3102 ASSERT_RTNL(); 3103 3104 idev = ipv6_find_idev(dev); 3105 if (!idev) { 3106 pr_debug("%s: add_dev failed\n", __func__); 3107 return; 3108 } 3109 3110 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 3111 } 3112 3113 void addrconf_add_linklocal(struct inet6_dev *idev, 3114 const struct in6_addr *addr, u32 flags) 3115 { 3116 struct ifa6_config cfg = { 3117 .pfx = addr, 3118 .plen = 64, 3119 .ifa_flags = flags | IFA_F_PERMANENT, 3120 .valid_lft = INFINITY_LIFE_TIME, 3121 .preferred_lft = INFINITY_LIFE_TIME, 3122 .scope = IFA_LINK 3123 }; 3124 struct inet6_ifaddr *ifp; 3125 3126 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3127 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad || 3128 idev->cnf.optimistic_dad) && 3129 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3130 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 3131 #endif 3132 3133 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3134 if (!IS_ERR(ifp)) { 3135 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev, 3136 0, 0, GFP_ATOMIC); 3137 addrconf_dad_start(ifp); 3138 in6_ifa_put(ifp); 3139 } 3140 } 3141 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3142 3143 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3144 { 3145 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3146 return true; 3147 3148 if (address.s6_addr32[2] == htonl(0x02005eff) && 3149 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3150 return true; 3151 3152 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3153 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3154 return true; 3155 3156 return false; 3157 } 3158 3159 static int ipv6_generate_stable_address(struct in6_addr *address, 3160 u8 dad_count, 3161 const struct inet6_dev *idev) 3162 { 3163 static DEFINE_SPINLOCK(lock); 3164 static __u32 digest[SHA_DIGEST_WORDS]; 3165 static __u32 workspace[SHA_WORKSPACE_WORDS]; 3166 3167 static union { 3168 char __data[SHA_MESSAGE_BYTES]; 3169 struct { 3170 struct in6_addr secret; 3171 __be32 prefix[2]; 3172 unsigned char hwaddr[MAX_ADDR_LEN]; 3173 u8 dad_count; 3174 } __packed; 3175 } data; 3176 3177 struct in6_addr secret; 3178 struct in6_addr temp; 3179 struct net *net = dev_net(idev->dev); 3180 3181 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3182 3183 if (idev->cnf.stable_secret.initialized) 3184 secret = idev->cnf.stable_secret.secret; 3185 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3186 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3187 else 3188 return -1; 3189 3190 retry: 3191 spin_lock_bh(&lock); 3192 3193 sha_init(digest); 3194 memset(&data, 0, sizeof(data)); 3195 memset(workspace, 0, sizeof(workspace)); 3196 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3197 data.prefix[0] = address->s6_addr32[0]; 3198 data.prefix[1] = address->s6_addr32[1]; 3199 data.secret = secret; 3200 data.dad_count = dad_count; 3201 3202 sha_transform(digest, data.__data, workspace); 3203 3204 temp = *address; 3205 temp.s6_addr32[2] = (__force __be32)digest[0]; 3206 temp.s6_addr32[3] = (__force __be32)digest[1]; 3207 3208 spin_unlock_bh(&lock); 3209 3210 if (ipv6_reserved_interfaceid(temp)) { 3211 dad_count++; 3212 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3213 return -1; 3214 goto retry; 3215 } 3216 3217 *address = temp; 3218 return 0; 3219 } 3220 3221 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3222 { 3223 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3224 3225 if (s->initialized) 3226 return; 3227 s = &idev->cnf.stable_secret; 3228 get_random_bytes(&s->secret, sizeof(s->secret)); 3229 s->initialized = true; 3230 } 3231 3232 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3233 { 3234 struct in6_addr addr; 3235 3236 /* no link local addresses on L3 master devices */ 3237 if (netif_is_l3_master(idev->dev)) 3238 return; 3239 3240 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3241 3242 switch (idev->cnf.addr_gen_mode) { 3243 case IN6_ADDR_GEN_MODE_RANDOM: 3244 ipv6_gen_mode_random_init(idev); 3245 /* fallthrough */ 3246 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3247 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3248 addrconf_add_linklocal(idev, &addr, 3249 IFA_F_STABLE_PRIVACY); 3250 else if (prefix_route) 3251 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3252 0, 0, GFP_KERNEL); 3253 break; 3254 case IN6_ADDR_GEN_MODE_EUI64: 3255 /* addrconf_add_linklocal also adds a prefix_route and we 3256 * only need to care about prefix routes if ipv6_generate_eui64 3257 * couldn't generate one. 3258 */ 3259 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3260 addrconf_add_linklocal(idev, &addr, 0); 3261 else if (prefix_route) 3262 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3263 0, 0, GFP_KERNEL); 3264 break; 3265 case IN6_ADDR_GEN_MODE_NONE: 3266 default: 3267 /* will not add any link local address */ 3268 break; 3269 } 3270 } 3271 3272 static void addrconf_dev_config(struct net_device *dev) 3273 { 3274 struct inet6_dev *idev; 3275 3276 ASSERT_RTNL(); 3277 3278 if ((dev->type != ARPHRD_ETHER) && 3279 (dev->type != ARPHRD_FDDI) && 3280 (dev->type != ARPHRD_ARCNET) && 3281 (dev->type != ARPHRD_INFINIBAND) && 3282 (dev->type != ARPHRD_IEEE1394) && 3283 (dev->type != ARPHRD_TUNNEL6) && 3284 (dev->type != ARPHRD_6LOWPAN) && 3285 (dev->type != ARPHRD_IP6GRE) && 3286 (dev->type != ARPHRD_IPGRE) && 3287 (dev->type != ARPHRD_TUNNEL) && 3288 (dev->type != ARPHRD_NONE) && 3289 (dev->type != ARPHRD_RAWIP)) { 3290 /* Alas, we support only Ethernet autoconfiguration. */ 3291 return; 3292 } 3293 3294 idev = addrconf_add_dev(dev); 3295 if (IS_ERR(idev)) 3296 return; 3297 3298 /* this device type has no EUI support */ 3299 if (dev->type == ARPHRD_NONE && 3300 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3301 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3302 3303 addrconf_addr_gen(idev, false); 3304 } 3305 3306 #if IS_ENABLED(CONFIG_IPV6_SIT) 3307 static void addrconf_sit_config(struct net_device *dev) 3308 { 3309 struct inet6_dev *idev; 3310 3311 ASSERT_RTNL(); 3312 3313 /* 3314 * Configure the tunnel with one of our IPv4 3315 * addresses... we should configure all of 3316 * our v4 addrs in the tunnel 3317 */ 3318 3319 idev = ipv6_find_idev(dev); 3320 if (!idev) { 3321 pr_debug("%s: add_dev failed\n", __func__); 3322 return; 3323 } 3324 3325 if (dev->priv_flags & IFF_ISATAP) { 3326 addrconf_addr_gen(idev, false); 3327 return; 3328 } 3329 3330 sit_add_v4_addrs(idev); 3331 3332 if (dev->flags&IFF_POINTOPOINT) 3333 addrconf_add_mroute(dev); 3334 } 3335 #endif 3336 3337 #if IS_ENABLED(CONFIG_NET_IPGRE) 3338 static void addrconf_gre_config(struct net_device *dev) 3339 { 3340 struct inet6_dev *idev; 3341 3342 ASSERT_RTNL(); 3343 3344 idev = ipv6_find_idev(dev); 3345 if (!idev) { 3346 pr_debug("%s: add_dev failed\n", __func__); 3347 return; 3348 } 3349 3350 addrconf_addr_gen(idev, true); 3351 if (dev->flags & IFF_POINTOPOINT) 3352 addrconf_add_mroute(dev); 3353 } 3354 #endif 3355 3356 static int fixup_permanent_addr(struct net *net, 3357 struct inet6_dev *idev, 3358 struct inet6_ifaddr *ifp) 3359 { 3360 /* !fib6_node means the host route was removed from the 3361 * FIB, for example, if 'lo' device is taken down. In that 3362 * case regenerate the host route. 3363 */ 3364 if (!ifp->rt || !ifp->rt->fib6_node) { 3365 struct fib6_info *f6i, *prev; 3366 3367 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false, 3368 GFP_ATOMIC); 3369 if (IS_ERR(f6i)) 3370 return PTR_ERR(f6i); 3371 3372 /* ifp->rt can be accessed outside of rtnl */ 3373 spin_lock(&ifp->lock); 3374 prev = ifp->rt; 3375 ifp->rt = f6i; 3376 spin_unlock(&ifp->lock); 3377 3378 fib6_info_release(prev); 3379 } 3380 3381 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3382 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3383 ifp->rt_priority, idev->dev, 0, 0, 3384 GFP_ATOMIC); 3385 } 3386 3387 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3388 addrconf_dad_start(ifp); 3389 3390 return 0; 3391 } 3392 3393 static void addrconf_permanent_addr(struct net *net, struct net_device *dev) 3394 { 3395 struct inet6_ifaddr *ifp, *tmp; 3396 struct inet6_dev *idev; 3397 3398 idev = __in6_dev_get(dev); 3399 if (!idev) 3400 return; 3401 3402 write_lock_bh(&idev->lock); 3403 3404 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3405 if ((ifp->flags & IFA_F_PERMANENT) && 3406 fixup_permanent_addr(net, idev, ifp) < 0) { 3407 write_unlock_bh(&idev->lock); 3408 in6_ifa_hold(ifp); 3409 ipv6_del_addr(ifp); 3410 write_lock_bh(&idev->lock); 3411 3412 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3413 idev->dev->name, &ifp->addr); 3414 } 3415 } 3416 3417 write_unlock_bh(&idev->lock); 3418 } 3419 3420 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3421 void *ptr) 3422 { 3423 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3424 struct netdev_notifier_changeupper_info *info; 3425 struct inet6_dev *idev = __in6_dev_get(dev); 3426 struct net *net = dev_net(dev); 3427 int run_pending = 0; 3428 int err; 3429 3430 switch (event) { 3431 case NETDEV_REGISTER: 3432 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3433 idev = ipv6_add_dev(dev); 3434 if (IS_ERR(idev)) 3435 return notifier_from_errno(PTR_ERR(idev)); 3436 } 3437 break; 3438 3439 case NETDEV_CHANGEMTU: 3440 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3441 if (dev->mtu < IPV6_MIN_MTU) { 3442 addrconf_ifdown(dev, dev != net->loopback_dev); 3443 break; 3444 } 3445 3446 if (idev) { 3447 rt6_mtu_change(dev, dev->mtu); 3448 idev->cnf.mtu6 = dev->mtu; 3449 break; 3450 } 3451 3452 /* allocate new idev */ 3453 idev = ipv6_add_dev(dev); 3454 if (IS_ERR(idev)) 3455 break; 3456 3457 /* device is still not ready */ 3458 if (!(idev->if_flags & IF_READY)) 3459 break; 3460 3461 run_pending = 1; 3462 3463 /* fall through */ 3464 3465 case NETDEV_UP: 3466 case NETDEV_CHANGE: 3467 if (dev->flags & IFF_SLAVE) 3468 break; 3469 3470 if (idev && idev->cnf.disable_ipv6) 3471 break; 3472 3473 if (event == NETDEV_UP) { 3474 /* restore routes for permanent addresses */ 3475 addrconf_permanent_addr(net, dev); 3476 3477 if (!addrconf_link_ready(dev)) { 3478 /* device is not ready yet. */ 3479 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3480 dev->name); 3481 break; 3482 } 3483 3484 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3485 idev = ipv6_add_dev(dev); 3486 3487 if (!IS_ERR_OR_NULL(idev)) { 3488 idev->if_flags |= IF_READY; 3489 run_pending = 1; 3490 } 3491 } else if (event == NETDEV_CHANGE) { 3492 if (!addrconf_link_ready(dev)) { 3493 /* device is still not ready. */ 3494 rt6_sync_down_dev(dev, event); 3495 break; 3496 } 3497 3498 if (idev) { 3499 if (idev->if_flags & IF_READY) { 3500 /* device is already configured - 3501 * but resend MLD reports, we might 3502 * have roamed and need to update 3503 * multicast snooping switches 3504 */ 3505 ipv6_mc_up(idev); 3506 rt6_sync_up(dev, RTNH_F_LINKDOWN); 3507 break; 3508 } 3509 idev->if_flags |= IF_READY; 3510 } 3511 3512 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3513 dev->name); 3514 3515 run_pending = 1; 3516 } 3517 3518 switch (dev->type) { 3519 #if IS_ENABLED(CONFIG_IPV6_SIT) 3520 case ARPHRD_SIT: 3521 addrconf_sit_config(dev); 3522 break; 3523 #endif 3524 #if IS_ENABLED(CONFIG_NET_IPGRE) 3525 case ARPHRD_IPGRE: 3526 addrconf_gre_config(dev); 3527 break; 3528 #endif 3529 case ARPHRD_LOOPBACK: 3530 init_loopback(dev); 3531 break; 3532 3533 default: 3534 addrconf_dev_config(dev); 3535 break; 3536 } 3537 3538 if (!IS_ERR_OR_NULL(idev)) { 3539 if (run_pending) 3540 addrconf_dad_run(idev); 3541 3542 /* Device has an address by now */ 3543 rt6_sync_up(dev, RTNH_F_DEAD); 3544 3545 /* 3546 * If the MTU changed during the interface down, 3547 * when the interface up, the changed MTU must be 3548 * reflected in the idev as well as routers. 3549 */ 3550 if (idev->cnf.mtu6 != dev->mtu && 3551 dev->mtu >= IPV6_MIN_MTU) { 3552 rt6_mtu_change(dev, dev->mtu); 3553 idev->cnf.mtu6 = dev->mtu; 3554 } 3555 idev->tstamp = jiffies; 3556 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3557 3558 /* 3559 * If the changed mtu during down is lower than 3560 * IPV6_MIN_MTU stop IPv6 on this interface. 3561 */ 3562 if (dev->mtu < IPV6_MIN_MTU) 3563 addrconf_ifdown(dev, dev != net->loopback_dev); 3564 } 3565 break; 3566 3567 case NETDEV_DOWN: 3568 case NETDEV_UNREGISTER: 3569 /* 3570 * Remove all addresses from this interface. 3571 */ 3572 addrconf_ifdown(dev, event != NETDEV_DOWN); 3573 break; 3574 3575 case NETDEV_CHANGENAME: 3576 if (idev) { 3577 snmp6_unregister_dev(idev); 3578 addrconf_sysctl_unregister(idev); 3579 err = addrconf_sysctl_register(idev); 3580 if (err) 3581 return notifier_from_errno(err); 3582 err = snmp6_register_dev(idev); 3583 if (err) { 3584 addrconf_sysctl_unregister(idev); 3585 return notifier_from_errno(err); 3586 } 3587 } 3588 break; 3589 3590 case NETDEV_PRE_TYPE_CHANGE: 3591 case NETDEV_POST_TYPE_CHANGE: 3592 if (idev) 3593 addrconf_type_change(dev, event); 3594 break; 3595 3596 case NETDEV_CHANGEUPPER: 3597 info = ptr; 3598 3599 /* flush all routes if dev is linked to or unlinked from 3600 * an L3 master device (e.g., VRF) 3601 */ 3602 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3603 addrconf_ifdown(dev, 0); 3604 } 3605 3606 return NOTIFY_OK; 3607 } 3608 3609 /* 3610 * addrconf module should be notified of a device going up 3611 */ 3612 static struct notifier_block ipv6_dev_notf = { 3613 .notifier_call = addrconf_notify, 3614 .priority = ADDRCONF_NOTIFY_PRIORITY, 3615 }; 3616 3617 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3618 { 3619 struct inet6_dev *idev; 3620 ASSERT_RTNL(); 3621 3622 idev = __in6_dev_get(dev); 3623 3624 if (event == NETDEV_POST_TYPE_CHANGE) 3625 ipv6_mc_remap(idev); 3626 else if (event == NETDEV_PRE_TYPE_CHANGE) 3627 ipv6_mc_unmap(idev); 3628 } 3629 3630 static bool addr_is_local(const struct in6_addr *addr) 3631 { 3632 return ipv6_addr_type(addr) & 3633 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3634 } 3635 3636 static int addrconf_ifdown(struct net_device *dev, int how) 3637 { 3638 unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN; 3639 struct net *net = dev_net(dev); 3640 struct inet6_dev *idev; 3641 struct inet6_ifaddr *ifa, *tmp; 3642 bool keep_addr = false; 3643 int state, i; 3644 3645 ASSERT_RTNL(); 3646 3647 rt6_disable_ip(dev, event); 3648 3649 idev = __in6_dev_get(dev); 3650 if (!idev) 3651 return -ENODEV; 3652 3653 /* 3654 * Step 1: remove reference to ipv6 device from parent device. 3655 * Do not dev_put! 3656 */ 3657 if (how) { 3658 idev->dead = 1; 3659 3660 /* protected by rtnl_lock */ 3661 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3662 3663 /* Step 1.5: remove snmp6 entry */ 3664 snmp6_unregister_dev(idev); 3665 3666 } 3667 3668 /* combine the user config with event to determine if permanent 3669 * addresses are to be removed from address hash table 3670 */ 3671 if (!how && !idev->cnf.disable_ipv6) { 3672 /* aggregate the system setting and interface setting */ 3673 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3674 3675 if (!_keep_addr) 3676 _keep_addr = idev->cnf.keep_addr_on_down; 3677 3678 keep_addr = (_keep_addr > 0); 3679 } 3680 3681 /* Step 2: clear hash table */ 3682 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3683 struct hlist_head *h = &inet6_addr_lst[i]; 3684 3685 spin_lock_bh(&addrconf_hash_lock); 3686 restart: 3687 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3688 if (ifa->idev == idev) { 3689 addrconf_del_dad_work(ifa); 3690 /* combined flag + permanent flag decide if 3691 * address is retained on a down event 3692 */ 3693 if (!keep_addr || 3694 !(ifa->flags & IFA_F_PERMANENT) || 3695 addr_is_local(&ifa->addr)) { 3696 hlist_del_init_rcu(&ifa->addr_lst); 3697 goto restart; 3698 } 3699 } 3700 } 3701 spin_unlock_bh(&addrconf_hash_lock); 3702 } 3703 3704 write_lock_bh(&idev->lock); 3705 3706 addrconf_del_rs_timer(idev); 3707 3708 /* Step 2: clear flags for stateless addrconf */ 3709 if (!how) 3710 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3711 3712 /* Step 3: clear tempaddr list */ 3713 while (!list_empty(&idev->tempaddr_list)) { 3714 ifa = list_first_entry(&idev->tempaddr_list, 3715 struct inet6_ifaddr, tmp_list); 3716 list_del(&ifa->tmp_list); 3717 write_unlock_bh(&idev->lock); 3718 spin_lock_bh(&ifa->lock); 3719 3720 if (ifa->ifpub) { 3721 in6_ifa_put(ifa->ifpub); 3722 ifa->ifpub = NULL; 3723 } 3724 spin_unlock_bh(&ifa->lock); 3725 in6_ifa_put(ifa); 3726 write_lock_bh(&idev->lock); 3727 } 3728 3729 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3730 struct fib6_info *rt = NULL; 3731 bool keep; 3732 3733 addrconf_del_dad_work(ifa); 3734 3735 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3736 !addr_is_local(&ifa->addr); 3737 3738 write_unlock_bh(&idev->lock); 3739 spin_lock_bh(&ifa->lock); 3740 3741 if (keep) { 3742 /* set state to skip the notifier below */ 3743 state = INET6_IFADDR_STATE_DEAD; 3744 ifa->state = INET6_IFADDR_STATE_PREDAD; 3745 if (!(ifa->flags & IFA_F_NODAD)) 3746 ifa->flags |= IFA_F_TENTATIVE; 3747 3748 rt = ifa->rt; 3749 ifa->rt = NULL; 3750 } else { 3751 state = ifa->state; 3752 ifa->state = INET6_IFADDR_STATE_DEAD; 3753 } 3754 3755 spin_unlock_bh(&ifa->lock); 3756 3757 if (rt) 3758 ip6_del_rt(net, rt); 3759 3760 if (state != INET6_IFADDR_STATE_DEAD) { 3761 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3762 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3763 } else { 3764 if (idev->cnf.forwarding) 3765 addrconf_leave_anycast(ifa); 3766 addrconf_leave_solict(ifa->idev, &ifa->addr); 3767 } 3768 3769 write_lock_bh(&idev->lock); 3770 if (!keep) { 3771 list_del_rcu(&ifa->if_list); 3772 in6_ifa_put(ifa); 3773 } 3774 } 3775 3776 write_unlock_bh(&idev->lock); 3777 3778 /* Step 5: Discard anycast and multicast list */ 3779 if (how) { 3780 ipv6_ac_destroy_dev(idev); 3781 ipv6_mc_destroy_dev(idev); 3782 } else { 3783 ipv6_mc_down(idev); 3784 } 3785 3786 idev->tstamp = jiffies; 3787 3788 /* Last: Shot the device (if unregistered) */ 3789 if (how) { 3790 addrconf_sysctl_unregister(idev); 3791 neigh_parms_release(&nd_tbl, idev->nd_parms); 3792 neigh_ifdown(&nd_tbl, dev); 3793 in6_dev_put(idev); 3794 } 3795 return 0; 3796 } 3797 3798 static void addrconf_rs_timer(struct timer_list *t) 3799 { 3800 struct inet6_dev *idev = from_timer(idev, t, rs_timer); 3801 struct net_device *dev = idev->dev; 3802 struct in6_addr lladdr; 3803 3804 write_lock(&idev->lock); 3805 if (idev->dead || !(idev->if_flags & IF_READY)) 3806 goto out; 3807 3808 if (!ipv6_accept_ra(idev)) 3809 goto out; 3810 3811 /* Announcement received after solicitation was sent */ 3812 if (idev->if_flags & IF_RA_RCVD) 3813 goto out; 3814 3815 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3816 write_unlock(&idev->lock); 3817 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3818 ndisc_send_rs(dev, &lladdr, 3819 &in6addr_linklocal_allrouters); 3820 else 3821 goto put; 3822 3823 write_lock(&idev->lock); 3824 idev->rs_interval = rfc3315_s14_backoff_update( 3825 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3826 /* The wait after the last probe can be shorter */ 3827 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3828 idev->cnf.rtr_solicits) ? 3829 idev->cnf.rtr_solicit_delay : 3830 idev->rs_interval); 3831 } else { 3832 /* 3833 * Note: we do not support deprecated "all on-link" 3834 * assumption any longer. 3835 */ 3836 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3837 } 3838 3839 out: 3840 write_unlock(&idev->lock); 3841 put: 3842 in6_dev_put(idev); 3843 } 3844 3845 /* 3846 * Duplicate Address Detection 3847 */ 3848 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3849 { 3850 unsigned long rand_num; 3851 struct inet6_dev *idev = ifp->idev; 3852 u64 nonce; 3853 3854 if (ifp->flags & IFA_F_OPTIMISTIC) 3855 rand_num = 0; 3856 else 3857 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3858 3859 nonce = 0; 3860 if (idev->cnf.enhanced_dad || 3861 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 3862 do 3863 get_random_bytes(&nonce, 6); 3864 while (nonce == 0); 3865 } 3866 ifp->dad_nonce = nonce; 3867 ifp->dad_probes = idev->cnf.dad_transmits; 3868 addrconf_mod_dad_work(ifp, rand_num); 3869 } 3870 3871 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3872 { 3873 struct inet6_dev *idev = ifp->idev; 3874 struct net_device *dev = idev->dev; 3875 bool bump_id, notify = false; 3876 struct net *net; 3877 3878 addrconf_join_solict(dev, &ifp->addr); 3879 3880 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3881 3882 read_lock_bh(&idev->lock); 3883 spin_lock(&ifp->lock); 3884 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3885 goto out; 3886 3887 net = dev_net(dev); 3888 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3889 (net->ipv6.devconf_all->accept_dad < 1 && 3890 idev->cnf.accept_dad < 1) || 3891 !(ifp->flags&IFA_F_TENTATIVE) || 3892 ifp->flags & IFA_F_NODAD) { 3893 bool send_na = false; 3894 3895 if (ifp->flags & IFA_F_TENTATIVE && 3896 !(ifp->flags & IFA_F_OPTIMISTIC)) 3897 send_na = true; 3898 bump_id = ifp->flags & IFA_F_TENTATIVE; 3899 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3900 spin_unlock(&ifp->lock); 3901 read_unlock_bh(&idev->lock); 3902 3903 addrconf_dad_completed(ifp, bump_id, send_na); 3904 return; 3905 } 3906 3907 if (!(idev->if_flags & IF_READY)) { 3908 spin_unlock(&ifp->lock); 3909 read_unlock_bh(&idev->lock); 3910 /* 3911 * If the device is not ready: 3912 * - keep it tentative if it is a permanent address. 3913 * - otherwise, kill it. 3914 */ 3915 in6_ifa_hold(ifp); 3916 addrconf_dad_stop(ifp, 0); 3917 return; 3918 } 3919 3920 /* 3921 * Optimistic nodes can start receiving 3922 * Frames right away 3923 */ 3924 if (ifp->flags & IFA_F_OPTIMISTIC) { 3925 ip6_ins_rt(net, ifp->rt); 3926 if (ipv6_use_optimistic_addr(net, idev)) { 3927 /* Because optimistic nodes can use this address, 3928 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3929 */ 3930 notify = true; 3931 } 3932 } 3933 3934 addrconf_dad_kick(ifp); 3935 out: 3936 spin_unlock(&ifp->lock); 3937 read_unlock_bh(&idev->lock); 3938 if (notify) 3939 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3940 } 3941 3942 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3943 { 3944 bool begin_dad = false; 3945 3946 spin_lock_bh(&ifp->lock); 3947 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3948 ifp->state = INET6_IFADDR_STATE_PREDAD; 3949 begin_dad = true; 3950 } 3951 spin_unlock_bh(&ifp->lock); 3952 3953 if (begin_dad) 3954 addrconf_mod_dad_work(ifp, 0); 3955 } 3956 3957 static void addrconf_dad_work(struct work_struct *w) 3958 { 3959 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3960 struct inet6_ifaddr, 3961 dad_work); 3962 struct inet6_dev *idev = ifp->idev; 3963 bool bump_id, disable_ipv6 = false; 3964 struct in6_addr mcaddr; 3965 3966 enum { 3967 DAD_PROCESS, 3968 DAD_BEGIN, 3969 DAD_ABORT, 3970 } action = DAD_PROCESS; 3971 3972 rtnl_lock(); 3973 3974 spin_lock_bh(&ifp->lock); 3975 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 3976 action = DAD_BEGIN; 3977 ifp->state = INET6_IFADDR_STATE_DAD; 3978 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 3979 action = DAD_ABORT; 3980 ifp->state = INET6_IFADDR_STATE_POSTDAD; 3981 3982 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 || 3983 idev->cnf.accept_dad > 1) && 3984 !idev->cnf.disable_ipv6 && 3985 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 3986 struct in6_addr addr; 3987 3988 addr.s6_addr32[0] = htonl(0xfe800000); 3989 addr.s6_addr32[1] = 0; 3990 3991 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 3992 ipv6_addr_equal(&ifp->addr, &addr)) { 3993 /* DAD failed for link-local based on MAC */ 3994 idev->cnf.disable_ipv6 = 1; 3995 3996 pr_info("%s: IPv6 being disabled!\n", 3997 ifp->idev->dev->name); 3998 disable_ipv6 = true; 3999 } 4000 } 4001 } 4002 spin_unlock_bh(&ifp->lock); 4003 4004 if (action == DAD_BEGIN) { 4005 addrconf_dad_begin(ifp); 4006 goto out; 4007 } else if (action == DAD_ABORT) { 4008 in6_ifa_hold(ifp); 4009 addrconf_dad_stop(ifp, 1); 4010 if (disable_ipv6) 4011 addrconf_ifdown(idev->dev, 0); 4012 goto out; 4013 } 4014 4015 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 4016 goto out; 4017 4018 write_lock_bh(&idev->lock); 4019 if (idev->dead || !(idev->if_flags & IF_READY)) { 4020 write_unlock_bh(&idev->lock); 4021 goto out; 4022 } 4023 4024 spin_lock(&ifp->lock); 4025 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 4026 spin_unlock(&ifp->lock); 4027 write_unlock_bh(&idev->lock); 4028 goto out; 4029 } 4030 4031 if (ifp->dad_probes == 0) { 4032 bool send_na = false; 4033 4034 /* 4035 * DAD was successful 4036 */ 4037 4038 if (ifp->flags & IFA_F_TENTATIVE && 4039 !(ifp->flags & IFA_F_OPTIMISTIC)) 4040 send_na = true; 4041 bump_id = ifp->flags & IFA_F_TENTATIVE; 4042 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4043 spin_unlock(&ifp->lock); 4044 write_unlock_bh(&idev->lock); 4045 4046 addrconf_dad_completed(ifp, bump_id, send_na); 4047 4048 goto out; 4049 } 4050 4051 ifp->dad_probes--; 4052 addrconf_mod_dad_work(ifp, 4053 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 4054 spin_unlock(&ifp->lock); 4055 write_unlock_bh(&idev->lock); 4056 4057 /* send a neighbour solicitation for our addr */ 4058 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 4059 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 4060 ifp->dad_nonce); 4061 out: 4062 in6_ifa_put(ifp); 4063 rtnl_unlock(); 4064 } 4065 4066 /* ifp->idev must be at least read locked */ 4067 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4068 { 4069 struct inet6_ifaddr *ifpiter; 4070 struct inet6_dev *idev = ifp->idev; 4071 4072 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4073 if (ifpiter->scope > IFA_LINK) 4074 break; 4075 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4076 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4077 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4078 IFA_F_PERMANENT) 4079 return false; 4080 } 4081 return true; 4082 } 4083 4084 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 4085 bool send_na) 4086 { 4087 struct net_device *dev = ifp->idev->dev; 4088 struct in6_addr lladdr; 4089 bool send_rs, send_mld; 4090 4091 addrconf_del_dad_work(ifp); 4092 4093 /* 4094 * Configure the address for reception. Now it is valid. 4095 */ 4096 4097 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4098 4099 /* If added prefix is link local and we are prepared to process 4100 router advertisements, start sending router solicitations. 4101 */ 4102 4103 read_lock_bh(&ifp->idev->lock); 4104 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4105 send_rs = send_mld && 4106 ipv6_accept_ra(ifp->idev) && 4107 ifp->idev->cnf.rtr_solicits != 0 && 4108 (dev->flags&IFF_LOOPBACK) == 0; 4109 read_unlock_bh(&ifp->idev->lock); 4110 4111 /* While dad is in progress mld report's source address is in6_addrany. 4112 * Resend with proper ll now. 4113 */ 4114 if (send_mld) 4115 ipv6_mc_dad_complete(ifp->idev); 4116 4117 /* send unsolicited NA if enabled */ 4118 if (send_na && 4119 (ifp->idev->cnf.ndisc_notify || 4120 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) { 4121 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr, 4122 /*router=*/ !!ifp->idev->cnf.forwarding, 4123 /*solicited=*/ false, /*override=*/ true, 4124 /*inc_opt=*/ true); 4125 } 4126 4127 if (send_rs) { 4128 /* 4129 * If a host as already performed a random delay 4130 * [...] as part of DAD [...] there is no need 4131 * to delay again before sending the first RS 4132 */ 4133 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4134 return; 4135 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4136 4137 write_lock_bh(&ifp->idev->lock); 4138 spin_lock(&ifp->lock); 4139 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4140 ifp->idev->cnf.rtr_solicit_interval); 4141 ifp->idev->rs_probes = 1; 4142 ifp->idev->if_flags |= IF_RS_SENT; 4143 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4144 spin_unlock(&ifp->lock); 4145 write_unlock_bh(&ifp->idev->lock); 4146 } 4147 4148 if (bump_id) 4149 rt_genid_bump_ipv6(dev_net(dev)); 4150 4151 /* Make sure that a new temporary address will be created 4152 * before this temporary address becomes deprecated. 4153 */ 4154 if (ifp->flags & IFA_F_TEMPORARY) 4155 addrconf_verify_rtnl(); 4156 } 4157 4158 static void addrconf_dad_run(struct inet6_dev *idev) 4159 { 4160 struct inet6_ifaddr *ifp; 4161 4162 read_lock_bh(&idev->lock); 4163 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4164 spin_lock(&ifp->lock); 4165 if (ifp->flags & IFA_F_TENTATIVE && 4166 ifp->state == INET6_IFADDR_STATE_DAD) 4167 addrconf_dad_kick(ifp); 4168 spin_unlock(&ifp->lock); 4169 } 4170 read_unlock_bh(&idev->lock); 4171 } 4172 4173 #ifdef CONFIG_PROC_FS 4174 struct if6_iter_state { 4175 struct seq_net_private p; 4176 int bucket; 4177 int offset; 4178 }; 4179 4180 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4181 { 4182 struct if6_iter_state *state = seq->private; 4183 struct net *net = seq_file_net(seq); 4184 struct inet6_ifaddr *ifa = NULL; 4185 int p = 0; 4186 4187 /* initial bucket if pos is 0 */ 4188 if (pos == 0) { 4189 state->bucket = 0; 4190 state->offset = 0; 4191 } 4192 4193 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4194 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket], 4195 addr_lst) { 4196 if (!net_eq(dev_net(ifa->idev->dev), net)) 4197 continue; 4198 /* sync with offset */ 4199 if (p < state->offset) { 4200 p++; 4201 continue; 4202 } 4203 state->offset++; 4204 return ifa; 4205 } 4206 4207 /* prepare for next bucket */ 4208 state->offset = 0; 4209 p = 0; 4210 } 4211 return NULL; 4212 } 4213 4214 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4215 struct inet6_ifaddr *ifa) 4216 { 4217 struct if6_iter_state *state = seq->private; 4218 struct net *net = seq_file_net(seq); 4219 4220 hlist_for_each_entry_continue_rcu(ifa, addr_lst) { 4221 if (!net_eq(dev_net(ifa->idev->dev), net)) 4222 continue; 4223 state->offset++; 4224 return ifa; 4225 } 4226 4227 while (++state->bucket < IN6_ADDR_HSIZE) { 4228 state->offset = 0; 4229 hlist_for_each_entry_rcu(ifa, 4230 &inet6_addr_lst[state->bucket], addr_lst) { 4231 if (!net_eq(dev_net(ifa->idev->dev), net)) 4232 continue; 4233 state->offset++; 4234 return ifa; 4235 } 4236 } 4237 4238 return NULL; 4239 } 4240 4241 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4242 __acquires(rcu) 4243 { 4244 rcu_read_lock(); 4245 return if6_get_first(seq, *pos); 4246 } 4247 4248 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4249 { 4250 struct inet6_ifaddr *ifa; 4251 4252 ifa = if6_get_next(seq, v); 4253 ++*pos; 4254 return ifa; 4255 } 4256 4257 static void if6_seq_stop(struct seq_file *seq, void *v) 4258 __releases(rcu) 4259 { 4260 rcu_read_unlock(); 4261 } 4262 4263 static int if6_seq_show(struct seq_file *seq, void *v) 4264 { 4265 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4266 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4267 &ifp->addr, 4268 ifp->idev->dev->ifindex, 4269 ifp->prefix_len, 4270 ifp->scope, 4271 (u8) ifp->flags, 4272 ifp->idev->dev->name); 4273 return 0; 4274 } 4275 4276 static const struct seq_operations if6_seq_ops = { 4277 .start = if6_seq_start, 4278 .next = if6_seq_next, 4279 .show = if6_seq_show, 4280 .stop = if6_seq_stop, 4281 }; 4282 4283 static int __net_init if6_proc_net_init(struct net *net) 4284 { 4285 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops, 4286 sizeof(struct if6_iter_state))) 4287 return -ENOMEM; 4288 return 0; 4289 } 4290 4291 static void __net_exit if6_proc_net_exit(struct net *net) 4292 { 4293 remove_proc_entry("if_inet6", net->proc_net); 4294 } 4295 4296 static struct pernet_operations if6_proc_net_ops = { 4297 .init = if6_proc_net_init, 4298 .exit = if6_proc_net_exit, 4299 }; 4300 4301 int __init if6_proc_init(void) 4302 { 4303 return register_pernet_subsys(&if6_proc_net_ops); 4304 } 4305 4306 void if6_proc_exit(void) 4307 { 4308 unregister_pernet_subsys(&if6_proc_net_ops); 4309 } 4310 #endif /* CONFIG_PROC_FS */ 4311 4312 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4313 /* Check if address is a home address configured on any interface. */ 4314 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4315 { 4316 unsigned int hash = inet6_addr_hash(net, addr); 4317 struct inet6_ifaddr *ifp = NULL; 4318 int ret = 0; 4319 4320 rcu_read_lock(); 4321 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 4322 if (!net_eq(dev_net(ifp->idev->dev), net)) 4323 continue; 4324 if (ipv6_addr_equal(&ifp->addr, addr) && 4325 (ifp->flags & IFA_F_HOMEADDRESS)) { 4326 ret = 1; 4327 break; 4328 } 4329 } 4330 rcu_read_unlock(); 4331 return ret; 4332 } 4333 #endif 4334 4335 /* 4336 * Periodic address status verification 4337 */ 4338 4339 static void addrconf_verify_rtnl(void) 4340 { 4341 unsigned long now, next, next_sec, next_sched; 4342 struct inet6_ifaddr *ifp; 4343 int i; 4344 4345 ASSERT_RTNL(); 4346 4347 rcu_read_lock_bh(); 4348 now = jiffies; 4349 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4350 4351 cancel_delayed_work(&addr_chk_work); 4352 4353 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4354 restart: 4355 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4356 unsigned long age; 4357 4358 /* When setting preferred_lft to a value not zero or 4359 * infinity, while valid_lft is infinity 4360 * IFA_F_PERMANENT has a non-infinity life time. 4361 */ 4362 if ((ifp->flags & IFA_F_PERMANENT) && 4363 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4364 continue; 4365 4366 spin_lock(&ifp->lock); 4367 /* We try to batch several events at once. */ 4368 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4369 4370 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4371 age >= ifp->valid_lft) { 4372 spin_unlock(&ifp->lock); 4373 in6_ifa_hold(ifp); 4374 ipv6_del_addr(ifp); 4375 goto restart; 4376 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4377 spin_unlock(&ifp->lock); 4378 continue; 4379 } else if (age >= ifp->prefered_lft) { 4380 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4381 int deprecate = 0; 4382 4383 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4384 deprecate = 1; 4385 ifp->flags |= IFA_F_DEPRECATED; 4386 } 4387 4388 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4389 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4390 next = ifp->tstamp + ifp->valid_lft * HZ; 4391 4392 spin_unlock(&ifp->lock); 4393 4394 if (deprecate) { 4395 in6_ifa_hold(ifp); 4396 4397 ipv6_ifa_notify(0, ifp); 4398 in6_ifa_put(ifp); 4399 goto restart; 4400 } 4401 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4402 !(ifp->flags&IFA_F_TENTATIVE)) { 4403 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4404 ifp->idev->cnf.dad_transmits * 4405 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 4406 4407 if (age >= ifp->prefered_lft - regen_advance) { 4408 struct inet6_ifaddr *ifpub = ifp->ifpub; 4409 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4410 next = ifp->tstamp + ifp->prefered_lft * HZ; 4411 if (!ifp->regen_count && ifpub) { 4412 ifp->regen_count++; 4413 in6_ifa_hold(ifp); 4414 in6_ifa_hold(ifpub); 4415 spin_unlock(&ifp->lock); 4416 4417 spin_lock(&ifpub->lock); 4418 ifpub->regen_count = 0; 4419 spin_unlock(&ifpub->lock); 4420 rcu_read_unlock_bh(); 4421 ipv6_create_tempaddr(ifpub, ifp, true); 4422 in6_ifa_put(ifpub); 4423 in6_ifa_put(ifp); 4424 rcu_read_lock_bh(); 4425 goto restart; 4426 } 4427 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4428 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4429 spin_unlock(&ifp->lock); 4430 } else { 4431 /* ifp->prefered_lft <= ifp->valid_lft */ 4432 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4433 next = ifp->tstamp + ifp->prefered_lft * HZ; 4434 spin_unlock(&ifp->lock); 4435 } 4436 } 4437 } 4438 4439 next_sec = round_jiffies_up(next); 4440 next_sched = next; 4441 4442 /* If rounded timeout is accurate enough, accept it. */ 4443 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4444 next_sched = next_sec; 4445 4446 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4447 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4448 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4449 4450 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4451 now, next, next_sec, next_sched); 4452 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4453 rcu_read_unlock_bh(); 4454 } 4455 4456 static void addrconf_verify_work(struct work_struct *w) 4457 { 4458 rtnl_lock(); 4459 addrconf_verify_rtnl(); 4460 rtnl_unlock(); 4461 } 4462 4463 static void addrconf_verify(void) 4464 { 4465 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4466 } 4467 4468 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4469 struct in6_addr **peer_pfx) 4470 { 4471 struct in6_addr *pfx = NULL; 4472 4473 *peer_pfx = NULL; 4474 4475 if (addr) 4476 pfx = nla_data(addr); 4477 4478 if (local) { 4479 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4480 *peer_pfx = pfx; 4481 pfx = nla_data(local); 4482 } 4483 4484 return pfx; 4485 } 4486 4487 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4488 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4489 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4490 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4491 [IFA_FLAGS] = { .len = sizeof(u32) }, 4492 [IFA_RT_PRIORITY] = { .len = sizeof(u32) }, 4493 }; 4494 4495 static int 4496 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4497 struct netlink_ext_ack *extack) 4498 { 4499 struct net *net = sock_net(skb->sk); 4500 struct ifaddrmsg *ifm; 4501 struct nlattr *tb[IFA_MAX+1]; 4502 struct in6_addr *pfx, *peer_pfx; 4503 u32 ifa_flags; 4504 int err; 4505 4506 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4507 extack); 4508 if (err < 0) 4509 return err; 4510 4511 ifm = nlmsg_data(nlh); 4512 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4513 if (!pfx) 4514 return -EINVAL; 4515 4516 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4517 4518 /* We ignore other flags so far. */ 4519 ifa_flags &= IFA_F_MANAGETEMPADDR; 4520 4521 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4522 ifm->ifa_prefixlen); 4523 } 4524 4525 static int modify_prefix_route(struct inet6_ifaddr *ifp, 4526 unsigned long expires, u32 flags) 4527 { 4528 struct fib6_info *f6i; 4529 u32 prio; 4530 4531 f6i = addrconf_get_prefix_route(&ifp->addr, 4532 ifp->prefix_len, 4533 ifp->idev->dev, 4534 0, RTF_GATEWAY | RTF_DEFAULT); 4535 if (!f6i) 4536 return -ENOENT; 4537 4538 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF; 4539 if (f6i->fib6_metric != prio) { 4540 /* delete old one */ 4541 ip6_del_rt(dev_net(ifp->idev->dev), f6i); 4542 4543 /* add new one */ 4544 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4545 ifp->rt_priority, ifp->idev->dev, 4546 expires, flags, GFP_KERNEL); 4547 } else { 4548 if (!expires) 4549 fib6_clean_expires(f6i); 4550 else 4551 fib6_set_expires(f6i, expires); 4552 4553 fib6_info_release(f6i); 4554 } 4555 4556 return 0; 4557 } 4558 4559 static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg) 4560 { 4561 u32 flags; 4562 clock_t expires; 4563 unsigned long timeout; 4564 bool was_managetempaddr; 4565 bool had_prefixroute; 4566 4567 ASSERT_RTNL(); 4568 4569 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 4570 return -EINVAL; 4571 4572 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && 4573 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4574 return -EINVAL; 4575 4576 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED) 4577 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC; 4578 4579 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 4580 if (addrconf_finite_timeout(timeout)) { 4581 expires = jiffies_to_clock_t(timeout * HZ); 4582 cfg->valid_lft = timeout; 4583 flags = RTF_EXPIRES; 4584 } else { 4585 expires = 0; 4586 flags = 0; 4587 cfg->ifa_flags |= IFA_F_PERMANENT; 4588 } 4589 4590 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 4591 if (addrconf_finite_timeout(timeout)) { 4592 if (timeout == 0) 4593 cfg->ifa_flags |= IFA_F_DEPRECATED; 4594 cfg->preferred_lft = timeout; 4595 } 4596 4597 spin_lock_bh(&ifp->lock); 4598 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4599 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4600 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4601 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4602 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4603 IFA_F_NOPREFIXROUTE); 4604 ifp->flags |= cfg->ifa_flags; 4605 ifp->tstamp = jiffies; 4606 ifp->valid_lft = cfg->valid_lft; 4607 ifp->prefered_lft = cfg->preferred_lft; 4608 4609 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority) 4610 ifp->rt_priority = cfg->rt_priority; 4611 4612 spin_unlock_bh(&ifp->lock); 4613 if (!(ifp->flags&IFA_F_TENTATIVE)) 4614 ipv6_ifa_notify(0, ifp); 4615 4616 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 4617 int rc = -ENOENT; 4618 4619 if (had_prefixroute) 4620 rc = modify_prefix_route(ifp, expires, flags); 4621 4622 /* prefix route could have been deleted; if so restore it */ 4623 if (rc == -ENOENT) { 4624 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4625 ifp->rt_priority, ifp->idev->dev, 4626 expires, flags, GFP_KERNEL); 4627 } 4628 } else if (had_prefixroute) { 4629 enum cleanup_prefix_rt_t action; 4630 unsigned long rt_expires; 4631 4632 write_lock_bh(&ifp->idev->lock); 4633 action = check_cleanup_prefix_route(ifp, &rt_expires); 4634 write_unlock_bh(&ifp->idev->lock); 4635 4636 if (action != CLEANUP_PREFIX_RT_NOP) { 4637 cleanup_prefix_route(ifp, rt_expires, 4638 action == CLEANUP_PREFIX_RT_DEL); 4639 } 4640 } 4641 4642 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4643 if (was_managetempaddr && 4644 !(ifp->flags & IFA_F_MANAGETEMPADDR)) { 4645 cfg->valid_lft = 0; 4646 cfg->preferred_lft = 0; 4647 } 4648 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft, 4649 cfg->preferred_lft, !was_managetempaddr, 4650 jiffies); 4651 } 4652 4653 addrconf_verify_rtnl(); 4654 4655 return 0; 4656 } 4657 4658 static int 4659 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4660 struct netlink_ext_ack *extack) 4661 { 4662 struct net *net = sock_net(skb->sk); 4663 struct ifaddrmsg *ifm; 4664 struct nlattr *tb[IFA_MAX+1]; 4665 struct in6_addr *peer_pfx; 4666 struct inet6_ifaddr *ifa; 4667 struct net_device *dev; 4668 struct inet6_dev *idev; 4669 struct ifa6_config cfg; 4670 int err; 4671 4672 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4673 extack); 4674 if (err < 0) 4675 return err; 4676 4677 memset(&cfg, 0, sizeof(cfg)); 4678 4679 ifm = nlmsg_data(nlh); 4680 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4681 if (!cfg.pfx) 4682 return -EINVAL; 4683 4684 cfg.peer_pfx = peer_pfx; 4685 cfg.plen = ifm->ifa_prefixlen; 4686 if (tb[IFA_RT_PRIORITY]) 4687 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]); 4688 4689 cfg.valid_lft = INFINITY_LIFE_TIME; 4690 cfg.preferred_lft = INFINITY_LIFE_TIME; 4691 4692 if (tb[IFA_CACHEINFO]) { 4693 struct ifa_cacheinfo *ci; 4694 4695 ci = nla_data(tb[IFA_CACHEINFO]); 4696 cfg.valid_lft = ci->ifa_valid; 4697 cfg.preferred_lft = ci->ifa_prefered; 4698 } 4699 4700 dev = __dev_get_by_index(net, ifm->ifa_index); 4701 if (!dev) 4702 return -ENODEV; 4703 4704 if (tb[IFA_FLAGS]) 4705 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]); 4706 else 4707 cfg.ifa_flags = ifm->ifa_flags; 4708 4709 /* We ignore other flags so far. */ 4710 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | 4711 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE | 4712 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC; 4713 4714 idev = ipv6_find_idev(dev); 4715 if (IS_ERR(idev)) 4716 return PTR_ERR(idev); 4717 4718 if (!ipv6_allow_optimistic_dad(net, idev)) 4719 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC; 4720 4721 if (cfg.ifa_flags & IFA_F_NODAD && 4722 cfg.ifa_flags & IFA_F_OPTIMISTIC) { 4723 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive"); 4724 return -EINVAL; 4725 } 4726 4727 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1); 4728 if (!ifa) { 4729 /* 4730 * It would be best to check for !NLM_F_CREATE here but 4731 * userspace already relies on not having to provide this. 4732 */ 4733 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack); 4734 } 4735 4736 if (nlh->nlmsg_flags & NLM_F_EXCL || 4737 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4738 err = -EEXIST; 4739 else 4740 err = inet6_addr_modify(ifa, &cfg); 4741 4742 in6_ifa_put(ifa); 4743 4744 return err; 4745 } 4746 4747 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4748 u8 scope, int ifindex) 4749 { 4750 struct ifaddrmsg *ifm; 4751 4752 ifm = nlmsg_data(nlh); 4753 ifm->ifa_family = AF_INET6; 4754 ifm->ifa_prefixlen = prefixlen; 4755 ifm->ifa_flags = flags; 4756 ifm->ifa_scope = scope; 4757 ifm->ifa_index = ifindex; 4758 } 4759 4760 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4761 unsigned long tstamp, u32 preferred, u32 valid) 4762 { 4763 struct ifa_cacheinfo ci; 4764 4765 ci.cstamp = cstamp_delta(cstamp); 4766 ci.tstamp = cstamp_delta(tstamp); 4767 ci.ifa_prefered = preferred; 4768 ci.ifa_valid = valid; 4769 4770 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4771 } 4772 4773 static inline int rt_scope(int ifa_scope) 4774 { 4775 if (ifa_scope & IFA_HOST) 4776 return RT_SCOPE_HOST; 4777 else if (ifa_scope & IFA_LINK) 4778 return RT_SCOPE_LINK; 4779 else if (ifa_scope & IFA_SITE) 4780 return RT_SCOPE_SITE; 4781 else 4782 return RT_SCOPE_UNIVERSE; 4783 } 4784 4785 static inline int inet6_ifaddr_msgsize(void) 4786 { 4787 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4788 + nla_total_size(16) /* IFA_LOCAL */ 4789 + nla_total_size(16) /* IFA_ADDRESS */ 4790 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4791 + nla_total_size(4) /* IFA_FLAGS */ 4792 + nla_total_size(4) /* IFA_RT_PRIORITY */; 4793 } 4794 4795 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4796 u32 portid, u32 seq, int event, unsigned int flags) 4797 { 4798 struct nlmsghdr *nlh; 4799 u32 preferred, valid; 4800 4801 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4802 if (!nlh) 4803 return -EMSGSIZE; 4804 4805 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4806 ifa->idev->dev->ifindex); 4807 4808 if (!((ifa->flags&IFA_F_PERMANENT) && 4809 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4810 preferred = ifa->prefered_lft; 4811 valid = ifa->valid_lft; 4812 if (preferred != INFINITY_LIFE_TIME) { 4813 long tval = (jiffies - ifa->tstamp)/HZ; 4814 if (preferred > tval) 4815 preferred -= tval; 4816 else 4817 preferred = 0; 4818 if (valid != INFINITY_LIFE_TIME) { 4819 if (valid > tval) 4820 valid -= tval; 4821 else 4822 valid = 0; 4823 } 4824 } 4825 } else { 4826 preferred = INFINITY_LIFE_TIME; 4827 valid = INFINITY_LIFE_TIME; 4828 } 4829 4830 if (!ipv6_addr_any(&ifa->peer_addr)) { 4831 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4832 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4833 goto error; 4834 } else 4835 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4836 goto error; 4837 4838 if (ifa->rt_priority && 4839 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority)) 4840 goto error; 4841 4842 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4843 goto error; 4844 4845 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4846 goto error; 4847 4848 nlmsg_end(skb, nlh); 4849 return 0; 4850 4851 error: 4852 nlmsg_cancel(skb, nlh); 4853 return -EMSGSIZE; 4854 } 4855 4856 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4857 u32 portid, u32 seq, int event, u16 flags) 4858 { 4859 struct nlmsghdr *nlh; 4860 u8 scope = RT_SCOPE_UNIVERSE; 4861 int ifindex = ifmca->idev->dev->ifindex; 4862 4863 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4864 scope = RT_SCOPE_SITE; 4865 4866 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4867 if (!nlh) 4868 return -EMSGSIZE; 4869 4870 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4871 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 4872 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4873 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4874 nlmsg_cancel(skb, nlh); 4875 return -EMSGSIZE; 4876 } 4877 4878 nlmsg_end(skb, nlh); 4879 return 0; 4880 } 4881 4882 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4883 u32 portid, u32 seq, int event, unsigned int flags) 4884 { 4885 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt); 4886 int ifindex = dev ? dev->ifindex : 1; 4887 struct nlmsghdr *nlh; 4888 u8 scope = RT_SCOPE_UNIVERSE; 4889 4890 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4891 scope = RT_SCOPE_SITE; 4892 4893 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4894 if (!nlh) 4895 return -EMSGSIZE; 4896 4897 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4898 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 4899 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4900 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4901 nlmsg_cancel(skb, nlh); 4902 return -EMSGSIZE; 4903 } 4904 4905 nlmsg_end(skb, nlh); 4906 return 0; 4907 } 4908 4909 enum addr_type_t { 4910 UNICAST_ADDR, 4911 MULTICAST_ADDR, 4912 ANYCAST_ADDR, 4913 }; 4914 4915 /* called with rcu_read_lock() */ 4916 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 4917 struct netlink_callback *cb, enum addr_type_t type, 4918 int s_ip_idx, int *p_ip_idx) 4919 { 4920 struct ifmcaddr6 *ifmca; 4921 struct ifacaddr6 *ifaca; 4922 int err = 1; 4923 int ip_idx = *p_ip_idx; 4924 4925 read_lock_bh(&idev->lock); 4926 switch (type) { 4927 case UNICAST_ADDR: { 4928 struct inet6_ifaddr *ifa; 4929 4930 /* unicast address incl. temp addr */ 4931 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4932 if (++ip_idx < s_ip_idx) 4933 continue; 4934 err = inet6_fill_ifaddr(skb, ifa, 4935 NETLINK_CB(cb->skb).portid, 4936 cb->nlh->nlmsg_seq, 4937 RTM_NEWADDR, 4938 NLM_F_MULTI); 4939 if (err < 0) 4940 break; 4941 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4942 } 4943 break; 4944 } 4945 case MULTICAST_ADDR: 4946 /* multicast address */ 4947 for (ifmca = idev->mc_list; ifmca; 4948 ifmca = ifmca->next, ip_idx++) { 4949 if (ip_idx < s_ip_idx) 4950 continue; 4951 err = inet6_fill_ifmcaddr(skb, ifmca, 4952 NETLINK_CB(cb->skb).portid, 4953 cb->nlh->nlmsg_seq, 4954 RTM_GETMULTICAST, 4955 NLM_F_MULTI); 4956 if (err < 0) 4957 break; 4958 } 4959 break; 4960 case ANYCAST_ADDR: 4961 /* anycast address */ 4962 for (ifaca = idev->ac_list; ifaca; 4963 ifaca = ifaca->aca_next, ip_idx++) { 4964 if (ip_idx < s_ip_idx) 4965 continue; 4966 err = inet6_fill_ifacaddr(skb, ifaca, 4967 NETLINK_CB(cb->skb).portid, 4968 cb->nlh->nlmsg_seq, 4969 RTM_GETANYCAST, 4970 NLM_F_MULTI); 4971 if (err < 0) 4972 break; 4973 } 4974 break; 4975 default: 4976 break; 4977 } 4978 read_unlock_bh(&idev->lock); 4979 *p_ip_idx = ip_idx; 4980 return err; 4981 } 4982 4983 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4984 enum addr_type_t type) 4985 { 4986 struct net *net = sock_net(skb->sk); 4987 int h, s_h; 4988 int idx, ip_idx; 4989 int s_idx, s_ip_idx; 4990 struct net_device *dev; 4991 struct inet6_dev *idev; 4992 struct hlist_head *head; 4993 4994 s_h = cb->args[0]; 4995 s_idx = idx = cb->args[1]; 4996 s_ip_idx = ip_idx = cb->args[2]; 4997 4998 rcu_read_lock(); 4999 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 5000 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5001 idx = 0; 5002 head = &net->dev_index_head[h]; 5003 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5004 if (idx < s_idx) 5005 goto cont; 5006 if (h > s_h || idx > s_idx) 5007 s_ip_idx = 0; 5008 ip_idx = 0; 5009 idev = __in6_dev_get(dev); 5010 if (!idev) 5011 goto cont; 5012 5013 if (in6_dump_addrs(idev, skb, cb, type, 5014 s_ip_idx, &ip_idx) < 0) 5015 goto done; 5016 cont: 5017 idx++; 5018 } 5019 } 5020 done: 5021 rcu_read_unlock(); 5022 cb->args[0] = h; 5023 cb->args[1] = idx; 5024 cb->args[2] = ip_idx; 5025 5026 return skb->len; 5027 } 5028 5029 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 5030 { 5031 enum addr_type_t type = UNICAST_ADDR; 5032 5033 return inet6_dump_addr(skb, cb, type); 5034 } 5035 5036 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 5037 { 5038 enum addr_type_t type = MULTICAST_ADDR; 5039 5040 return inet6_dump_addr(skb, cb, type); 5041 } 5042 5043 5044 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 5045 { 5046 enum addr_type_t type = ANYCAST_ADDR; 5047 5048 return inet6_dump_addr(skb, cb, type); 5049 } 5050 5051 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 5052 struct netlink_ext_ack *extack) 5053 { 5054 struct net *net = sock_net(in_skb->sk); 5055 struct ifaddrmsg *ifm; 5056 struct nlattr *tb[IFA_MAX+1]; 5057 struct in6_addr *addr = NULL, *peer; 5058 struct net_device *dev = NULL; 5059 struct inet6_ifaddr *ifa; 5060 struct sk_buff *skb; 5061 int err; 5062 5063 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 5064 extack); 5065 if (err < 0) 5066 return err; 5067 5068 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 5069 if (!addr) 5070 return -EINVAL; 5071 5072 ifm = nlmsg_data(nlh); 5073 if (ifm->ifa_index) 5074 dev = dev_get_by_index(net, ifm->ifa_index); 5075 5076 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 5077 if (!ifa) { 5078 err = -EADDRNOTAVAIL; 5079 goto errout; 5080 } 5081 5082 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 5083 if (!skb) { 5084 err = -ENOBUFS; 5085 goto errout_ifa; 5086 } 5087 5088 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 5089 nlh->nlmsg_seq, RTM_NEWADDR, 0); 5090 if (err < 0) { 5091 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5092 WARN_ON(err == -EMSGSIZE); 5093 kfree_skb(skb); 5094 goto errout_ifa; 5095 } 5096 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 5097 errout_ifa: 5098 in6_ifa_put(ifa); 5099 errout: 5100 if (dev) 5101 dev_put(dev); 5102 return err; 5103 } 5104 5105 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 5106 { 5107 struct sk_buff *skb; 5108 struct net *net = dev_net(ifa->idev->dev); 5109 int err = -ENOBUFS; 5110 5111 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 5112 if (!skb) 5113 goto errout; 5114 5115 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 5116 if (err < 0) { 5117 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5118 WARN_ON(err == -EMSGSIZE); 5119 kfree_skb(skb); 5120 goto errout; 5121 } 5122 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 5123 return; 5124 errout: 5125 if (err < 0) 5126 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 5127 } 5128 5129 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 5130 __s32 *array, int bytes) 5131 { 5132 BUG_ON(bytes < (DEVCONF_MAX * 4)); 5133 5134 memset(array, 0, bytes); 5135 array[DEVCONF_FORWARDING] = cnf->forwarding; 5136 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 5137 array[DEVCONF_MTU6] = cnf->mtu6; 5138 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 5139 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 5140 array[DEVCONF_AUTOCONF] = cnf->autoconf; 5141 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 5142 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 5143 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5144 jiffies_to_msecs(cnf->rtr_solicit_interval); 5145 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5146 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 5147 array[DEVCONF_RTR_SOLICIT_DELAY] = 5148 jiffies_to_msecs(cnf->rtr_solicit_delay); 5149 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 5150 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5151 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 5152 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5153 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 5154 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 5155 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 5156 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 5157 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 5158 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 5159 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 5160 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 5161 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 5162 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 5163 #ifdef CONFIG_IPV6_ROUTER_PREF 5164 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 5165 array[DEVCONF_RTR_PROBE_INTERVAL] = 5166 jiffies_to_msecs(cnf->rtr_probe_interval); 5167 #ifdef CONFIG_IPV6_ROUTE_INFO 5168 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen; 5169 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 5170 #endif 5171 #endif 5172 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 5173 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 5174 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5175 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 5176 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 5177 #endif 5178 #ifdef CONFIG_IPV6_MROUTE 5179 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 5180 #endif 5181 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 5182 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 5183 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 5184 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 5185 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 5186 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 5187 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 5188 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 5189 /* we omit DEVCONF_STABLE_SECRET for now */ 5190 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 5191 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 5192 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 5193 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5194 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5195 #ifdef CONFIG_IPV6_SEG6_HMAC 5196 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5197 #endif 5198 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5199 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5200 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy; 5201 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass; 5202 } 5203 5204 static inline size_t inet6_ifla6_size(void) 5205 { 5206 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5207 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5208 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5209 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5210 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5211 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */ 5212 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */ 5213 + 0; 5214 } 5215 5216 static inline size_t inet6_if_nlmsg_size(void) 5217 { 5218 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5219 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5220 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5221 + nla_total_size(4) /* IFLA_MTU */ 5222 + nla_total_size(4) /* IFLA_LINK */ 5223 + nla_total_size(1) /* IFLA_OPERSTATE */ 5224 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5225 } 5226 5227 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5228 int bytes) 5229 { 5230 int i; 5231 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5232 BUG_ON(pad < 0); 5233 5234 /* Use put_unaligned() because stats may not be aligned for u64. */ 5235 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5236 for (i = 1; i < ICMP6_MIB_MAX; i++) 5237 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5238 5239 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5240 } 5241 5242 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5243 int bytes, size_t syncpoff) 5244 { 5245 int i, c; 5246 u64 buff[IPSTATS_MIB_MAX]; 5247 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5248 5249 BUG_ON(pad < 0); 5250 5251 memset(buff, 0, sizeof(buff)); 5252 buff[0] = IPSTATS_MIB_MAX; 5253 5254 for_each_possible_cpu(c) { 5255 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5256 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5257 } 5258 5259 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5260 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5261 } 5262 5263 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5264 int bytes) 5265 { 5266 switch (attrtype) { 5267 case IFLA_INET6_STATS: 5268 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5269 offsetof(struct ipstats_mib, syncp)); 5270 break; 5271 case IFLA_INET6_ICMP6STATS: 5272 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5273 break; 5274 } 5275 } 5276 5277 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5278 u32 ext_filter_mask) 5279 { 5280 struct nlattr *nla; 5281 struct ifla_cacheinfo ci; 5282 5283 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5284 goto nla_put_failure; 5285 ci.max_reasm_len = IPV6_MAXPLEN; 5286 ci.tstamp = cstamp_delta(idev->tstamp); 5287 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5288 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5289 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5290 goto nla_put_failure; 5291 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5292 if (!nla) 5293 goto nla_put_failure; 5294 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5295 5296 /* XXX - MC not implemented */ 5297 5298 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5299 return 0; 5300 5301 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5302 if (!nla) 5303 goto nla_put_failure; 5304 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5305 5306 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5307 if (!nla) 5308 goto nla_put_failure; 5309 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5310 5311 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5312 if (!nla) 5313 goto nla_put_failure; 5314 5315 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5316 goto nla_put_failure; 5317 5318 read_lock_bh(&idev->lock); 5319 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5320 read_unlock_bh(&idev->lock); 5321 5322 return 0; 5323 5324 nla_put_failure: 5325 return -EMSGSIZE; 5326 } 5327 5328 static size_t inet6_get_link_af_size(const struct net_device *dev, 5329 u32 ext_filter_mask) 5330 { 5331 if (!__in6_dev_get(dev)) 5332 return 0; 5333 5334 return inet6_ifla6_size(); 5335 } 5336 5337 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5338 u32 ext_filter_mask) 5339 { 5340 struct inet6_dev *idev = __in6_dev_get(dev); 5341 5342 if (!idev) 5343 return -ENODATA; 5344 5345 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5346 return -EMSGSIZE; 5347 5348 return 0; 5349 } 5350 5351 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 5352 { 5353 struct inet6_ifaddr *ifp; 5354 struct net_device *dev = idev->dev; 5355 bool clear_token, update_rs = false; 5356 struct in6_addr ll_addr; 5357 5358 ASSERT_RTNL(); 5359 5360 if (!token) 5361 return -EINVAL; 5362 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 5363 return -EINVAL; 5364 if (!ipv6_accept_ra(idev)) 5365 return -EINVAL; 5366 if (idev->cnf.rtr_solicits == 0) 5367 return -EINVAL; 5368 5369 write_lock_bh(&idev->lock); 5370 5371 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5372 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5373 5374 write_unlock_bh(&idev->lock); 5375 5376 clear_token = ipv6_addr_any(token); 5377 if (clear_token) 5378 goto update_lft; 5379 5380 if (!idev->dead && (idev->if_flags & IF_READY) && 5381 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5382 IFA_F_OPTIMISTIC)) { 5383 /* If we're not ready, then normal ifup will take care 5384 * of this. Otherwise, we need to request our rs here. 5385 */ 5386 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5387 update_rs = true; 5388 } 5389 5390 update_lft: 5391 write_lock_bh(&idev->lock); 5392 5393 if (update_rs) { 5394 idev->if_flags |= IF_RS_SENT; 5395 idev->rs_interval = rfc3315_s14_backoff_init( 5396 idev->cnf.rtr_solicit_interval); 5397 idev->rs_probes = 1; 5398 addrconf_mod_rs_timer(idev, idev->rs_interval); 5399 } 5400 5401 /* Well, that's kinda nasty ... */ 5402 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5403 spin_lock(&ifp->lock); 5404 if (ifp->tokenized) { 5405 ifp->valid_lft = 0; 5406 ifp->prefered_lft = 0; 5407 } 5408 spin_unlock(&ifp->lock); 5409 } 5410 5411 write_unlock_bh(&idev->lock); 5412 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5413 addrconf_verify_rtnl(); 5414 return 0; 5415 } 5416 5417 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5418 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5419 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5420 }; 5421 5422 static int inet6_validate_link_af(const struct net_device *dev, 5423 const struct nlattr *nla) 5424 { 5425 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5426 5427 if (dev && !__in6_dev_get(dev)) 5428 return -EAFNOSUPPORT; 5429 5430 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy, 5431 NULL); 5432 } 5433 5434 static int check_addr_gen_mode(int mode) 5435 { 5436 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5437 mode != IN6_ADDR_GEN_MODE_NONE && 5438 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5439 mode != IN6_ADDR_GEN_MODE_RANDOM) 5440 return -EINVAL; 5441 return 1; 5442 } 5443 5444 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5445 int mode) 5446 { 5447 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5448 !idev->cnf.stable_secret.initialized && 5449 !net->ipv6.devconf_dflt->stable_secret.initialized) 5450 return -EINVAL; 5451 return 1; 5452 } 5453 5454 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 5455 { 5456 int err = -EINVAL; 5457 struct inet6_dev *idev = __in6_dev_get(dev); 5458 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5459 5460 if (!idev) 5461 return -EAFNOSUPPORT; 5462 5463 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 5464 BUG(); 5465 5466 if (tb[IFLA_INET6_TOKEN]) { 5467 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 5468 if (err) 5469 return err; 5470 } 5471 5472 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5473 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5474 5475 if (check_addr_gen_mode(mode) < 0 || 5476 check_stable_privacy(idev, dev_net(dev), mode) < 0) 5477 return -EINVAL; 5478 5479 idev->cnf.addr_gen_mode = mode; 5480 err = 0; 5481 } 5482 5483 return err; 5484 } 5485 5486 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5487 u32 portid, u32 seq, int event, unsigned int flags) 5488 { 5489 struct net_device *dev = idev->dev; 5490 struct ifinfomsg *hdr; 5491 struct nlmsghdr *nlh; 5492 void *protoinfo; 5493 5494 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5495 if (!nlh) 5496 return -EMSGSIZE; 5497 5498 hdr = nlmsg_data(nlh); 5499 hdr->ifi_family = AF_INET6; 5500 hdr->__ifi_pad = 0; 5501 hdr->ifi_type = dev->type; 5502 hdr->ifi_index = dev->ifindex; 5503 hdr->ifi_flags = dev_get_flags(dev); 5504 hdr->ifi_change = 0; 5505 5506 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5507 (dev->addr_len && 5508 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5509 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5510 (dev->ifindex != dev_get_iflink(dev) && 5511 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5512 nla_put_u8(skb, IFLA_OPERSTATE, 5513 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5514 goto nla_put_failure; 5515 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 5516 if (!protoinfo) 5517 goto nla_put_failure; 5518 5519 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5520 goto nla_put_failure; 5521 5522 nla_nest_end(skb, protoinfo); 5523 nlmsg_end(skb, nlh); 5524 return 0; 5525 5526 nla_put_failure: 5527 nlmsg_cancel(skb, nlh); 5528 return -EMSGSIZE; 5529 } 5530 5531 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5532 { 5533 struct net *net = sock_net(skb->sk); 5534 int h, s_h; 5535 int idx = 0, s_idx; 5536 struct net_device *dev; 5537 struct inet6_dev *idev; 5538 struct hlist_head *head; 5539 5540 s_h = cb->args[0]; 5541 s_idx = cb->args[1]; 5542 5543 rcu_read_lock(); 5544 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5545 idx = 0; 5546 head = &net->dev_index_head[h]; 5547 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5548 if (idx < s_idx) 5549 goto cont; 5550 idev = __in6_dev_get(dev); 5551 if (!idev) 5552 goto cont; 5553 if (inet6_fill_ifinfo(skb, idev, 5554 NETLINK_CB(cb->skb).portid, 5555 cb->nlh->nlmsg_seq, 5556 RTM_NEWLINK, NLM_F_MULTI) < 0) 5557 goto out; 5558 cont: 5559 idx++; 5560 } 5561 } 5562 out: 5563 rcu_read_unlock(); 5564 cb->args[1] = idx; 5565 cb->args[0] = h; 5566 5567 return skb->len; 5568 } 5569 5570 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5571 { 5572 struct sk_buff *skb; 5573 struct net *net = dev_net(idev->dev); 5574 int err = -ENOBUFS; 5575 5576 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5577 if (!skb) 5578 goto errout; 5579 5580 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5581 if (err < 0) { 5582 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5583 WARN_ON(err == -EMSGSIZE); 5584 kfree_skb(skb); 5585 goto errout; 5586 } 5587 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5588 return; 5589 errout: 5590 if (err < 0) 5591 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5592 } 5593 5594 static inline size_t inet6_prefix_nlmsg_size(void) 5595 { 5596 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5597 + nla_total_size(sizeof(struct in6_addr)) 5598 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5599 } 5600 5601 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5602 struct prefix_info *pinfo, u32 portid, u32 seq, 5603 int event, unsigned int flags) 5604 { 5605 struct prefixmsg *pmsg; 5606 struct nlmsghdr *nlh; 5607 struct prefix_cacheinfo ci; 5608 5609 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5610 if (!nlh) 5611 return -EMSGSIZE; 5612 5613 pmsg = nlmsg_data(nlh); 5614 pmsg->prefix_family = AF_INET6; 5615 pmsg->prefix_pad1 = 0; 5616 pmsg->prefix_pad2 = 0; 5617 pmsg->prefix_ifindex = idev->dev->ifindex; 5618 pmsg->prefix_len = pinfo->prefix_len; 5619 pmsg->prefix_type = pinfo->type; 5620 pmsg->prefix_pad3 = 0; 5621 pmsg->prefix_flags = 0; 5622 if (pinfo->onlink) 5623 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 5624 if (pinfo->autoconf) 5625 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 5626 5627 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5628 goto nla_put_failure; 5629 ci.preferred_time = ntohl(pinfo->prefered); 5630 ci.valid_time = ntohl(pinfo->valid); 5631 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 5632 goto nla_put_failure; 5633 nlmsg_end(skb, nlh); 5634 return 0; 5635 5636 nla_put_failure: 5637 nlmsg_cancel(skb, nlh); 5638 return -EMSGSIZE; 5639 } 5640 5641 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 5642 struct prefix_info *pinfo) 5643 { 5644 struct sk_buff *skb; 5645 struct net *net = dev_net(idev->dev); 5646 int err = -ENOBUFS; 5647 5648 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 5649 if (!skb) 5650 goto errout; 5651 5652 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5653 if (err < 0) { 5654 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5655 WARN_ON(err == -EMSGSIZE); 5656 kfree_skb(skb); 5657 goto errout; 5658 } 5659 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5660 return; 5661 errout: 5662 if (err < 0) 5663 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 5664 } 5665 5666 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5667 { 5668 struct net *net = dev_net(ifp->idev->dev); 5669 5670 if (event) 5671 ASSERT_RTNL(); 5672 5673 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 5674 5675 switch (event) { 5676 case RTM_NEWADDR: 5677 /* 5678 * If the address was optimistic 5679 * we inserted the route at the start of 5680 * our DAD process, so we don't need 5681 * to do it again 5682 */ 5683 if (!rcu_access_pointer(ifp->rt->fib6_node)) 5684 ip6_ins_rt(net, ifp->rt); 5685 if (ifp->idev->cnf.forwarding) 5686 addrconf_join_anycast(ifp); 5687 if (!ipv6_addr_any(&ifp->peer_addr)) 5688 addrconf_prefix_route(&ifp->peer_addr, 128, 0, 5689 ifp->idev->dev, 0, 0, 5690 GFP_ATOMIC); 5691 break; 5692 case RTM_DELADDR: 5693 if (ifp->idev->cnf.forwarding) 5694 addrconf_leave_anycast(ifp); 5695 addrconf_leave_solict(ifp->idev, &ifp->addr); 5696 if (!ipv6_addr_any(&ifp->peer_addr)) { 5697 struct fib6_info *rt; 5698 5699 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 5700 ifp->idev->dev, 0, 0); 5701 if (rt) 5702 ip6_del_rt(net, rt); 5703 } 5704 if (ifp->rt) { 5705 ip6_del_rt(net, ifp->rt); 5706 ifp->rt = NULL; 5707 } 5708 rt_genid_bump_ipv6(net); 5709 break; 5710 } 5711 atomic_inc(&net->ipv6.dev_addr_genid); 5712 } 5713 5714 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5715 { 5716 rcu_read_lock_bh(); 5717 if (likely(ifp->idev->dead == 0)) 5718 __ipv6_ifa_notify(event, ifp); 5719 rcu_read_unlock_bh(); 5720 } 5721 5722 #ifdef CONFIG_SYSCTL 5723 5724 static 5725 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 5726 void __user *buffer, size_t *lenp, loff_t *ppos) 5727 { 5728 int *valp = ctl->data; 5729 int val = *valp; 5730 loff_t pos = *ppos; 5731 struct ctl_table lctl; 5732 int ret; 5733 5734 /* 5735 * ctl->data points to idev->cnf.forwarding, we should 5736 * not modify it until we get the rtnl lock. 5737 */ 5738 lctl = *ctl; 5739 lctl.data = &val; 5740 5741 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5742 5743 if (write) 5744 ret = addrconf_fixup_forwarding(ctl, valp, val); 5745 if (ret) 5746 *ppos = pos; 5747 return ret; 5748 } 5749 5750 static 5751 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 5752 void __user *buffer, size_t *lenp, loff_t *ppos) 5753 { 5754 struct inet6_dev *idev = ctl->extra1; 5755 int min_mtu = IPV6_MIN_MTU; 5756 struct ctl_table lctl; 5757 5758 lctl = *ctl; 5759 lctl.extra1 = &min_mtu; 5760 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 5761 5762 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5763 } 5764 5765 static void dev_disable_change(struct inet6_dev *idev) 5766 { 5767 struct netdev_notifier_info info; 5768 5769 if (!idev || !idev->dev) 5770 return; 5771 5772 netdev_notifier_info_init(&info, idev->dev); 5773 if (idev->cnf.disable_ipv6) 5774 addrconf_notify(NULL, NETDEV_DOWN, &info); 5775 else 5776 addrconf_notify(NULL, NETDEV_UP, &info); 5777 } 5778 5779 static void addrconf_disable_change(struct net *net, __s32 newf) 5780 { 5781 struct net_device *dev; 5782 struct inet6_dev *idev; 5783 5784 for_each_netdev(net, dev) { 5785 idev = __in6_dev_get(dev); 5786 if (idev) { 5787 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 5788 idev->cnf.disable_ipv6 = newf; 5789 if (changed) 5790 dev_disable_change(idev); 5791 } 5792 } 5793 } 5794 5795 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 5796 { 5797 struct net *net; 5798 int old; 5799 5800 if (!rtnl_trylock()) 5801 return restart_syscall(); 5802 5803 net = (struct net *)table->extra2; 5804 old = *p; 5805 *p = newf; 5806 5807 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 5808 rtnl_unlock(); 5809 return 0; 5810 } 5811 5812 if (p == &net->ipv6.devconf_all->disable_ipv6) { 5813 net->ipv6.devconf_dflt->disable_ipv6 = newf; 5814 addrconf_disable_change(net, newf); 5815 } else if ((!newf) ^ (!old)) 5816 dev_disable_change((struct inet6_dev *)table->extra1); 5817 5818 rtnl_unlock(); 5819 return 0; 5820 } 5821 5822 static 5823 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 5824 void __user *buffer, size_t *lenp, loff_t *ppos) 5825 { 5826 int *valp = ctl->data; 5827 int val = *valp; 5828 loff_t pos = *ppos; 5829 struct ctl_table lctl; 5830 int ret; 5831 5832 /* 5833 * ctl->data points to idev->cnf.disable_ipv6, we should 5834 * not modify it until we get the rtnl lock. 5835 */ 5836 lctl = *ctl; 5837 lctl.data = &val; 5838 5839 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5840 5841 if (write) 5842 ret = addrconf_disable_ipv6(ctl, valp, val); 5843 if (ret) 5844 *ppos = pos; 5845 return ret; 5846 } 5847 5848 static 5849 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 5850 void __user *buffer, size_t *lenp, loff_t *ppos) 5851 { 5852 int *valp = ctl->data; 5853 int ret; 5854 int old, new; 5855 5856 old = *valp; 5857 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5858 new = *valp; 5859 5860 if (write && old != new) { 5861 struct net *net = ctl->extra2; 5862 5863 if (!rtnl_trylock()) 5864 return restart_syscall(); 5865 5866 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 5867 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5868 NETCONFA_PROXY_NEIGH, 5869 NETCONFA_IFINDEX_DEFAULT, 5870 net->ipv6.devconf_dflt); 5871 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 5872 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5873 NETCONFA_PROXY_NEIGH, 5874 NETCONFA_IFINDEX_ALL, 5875 net->ipv6.devconf_all); 5876 else { 5877 struct inet6_dev *idev = ctl->extra1; 5878 5879 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5880 NETCONFA_PROXY_NEIGH, 5881 idev->dev->ifindex, 5882 &idev->cnf); 5883 } 5884 rtnl_unlock(); 5885 } 5886 5887 return ret; 5888 } 5889 5890 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 5891 void __user *buffer, size_t *lenp, 5892 loff_t *ppos) 5893 { 5894 int ret = 0; 5895 u32 new_val; 5896 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 5897 struct net *net = (struct net *)ctl->extra2; 5898 struct ctl_table tmp = { 5899 .data = &new_val, 5900 .maxlen = sizeof(new_val), 5901 .mode = ctl->mode, 5902 }; 5903 5904 if (!rtnl_trylock()) 5905 return restart_syscall(); 5906 5907 new_val = *((u32 *)ctl->data); 5908 5909 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos); 5910 if (ret != 0) 5911 goto out; 5912 5913 if (write) { 5914 if (check_addr_gen_mode(new_val) < 0) { 5915 ret = -EINVAL; 5916 goto out; 5917 } 5918 5919 if (idev) { 5920 if (check_stable_privacy(idev, net, new_val) < 0) { 5921 ret = -EINVAL; 5922 goto out; 5923 } 5924 5925 if (idev->cnf.addr_gen_mode != new_val) { 5926 idev->cnf.addr_gen_mode = new_val; 5927 addrconf_dev_config(idev->dev); 5928 } 5929 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) { 5930 struct net_device *dev; 5931 5932 net->ipv6.devconf_dflt->addr_gen_mode = new_val; 5933 for_each_netdev(net, dev) { 5934 idev = __in6_dev_get(dev); 5935 if (idev && 5936 idev->cnf.addr_gen_mode != new_val) { 5937 idev->cnf.addr_gen_mode = new_val; 5938 addrconf_dev_config(idev->dev); 5939 } 5940 } 5941 } 5942 5943 *((u32 *)ctl->data) = new_val; 5944 } 5945 5946 out: 5947 rtnl_unlock(); 5948 5949 return ret; 5950 } 5951 5952 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 5953 void __user *buffer, size_t *lenp, 5954 loff_t *ppos) 5955 { 5956 int err; 5957 struct in6_addr addr; 5958 char str[IPV6_MAX_STRLEN]; 5959 struct ctl_table lctl = *ctl; 5960 struct net *net = ctl->extra2; 5961 struct ipv6_stable_secret *secret = ctl->data; 5962 5963 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 5964 return -EIO; 5965 5966 lctl.maxlen = IPV6_MAX_STRLEN; 5967 lctl.data = str; 5968 5969 if (!rtnl_trylock()) 5970 return restart_syscall(); 5971 5972 if (!write && !secret->initialized) { 5973 err = -EIO; 5974 goto out; 5975 } 5976 5977 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 5978 if (err >= sizeof(str)) { 5979 err = -EIO; 5980 goto out; 5981 } 5982 5983 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 5984 if (err || !write) 5985 goto out; 5986 5987 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 5988 err = -EIO; 5989 goto out; 5990 } 5991 5992 secret->initialized = true; 5993 secret->secret = addr; 5994 5995 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 5996 struct net_device *dev; 5997 5998 for_each_netdev(net, dev) { 5999 struct inet6_dev *idev = __in6_dev_get(dev); 6000 6001 if (idev) { 6002 idev->cnf.addr_gen_mode = 6003 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6004 } 6005 } 6006 } else { 6007 struct inet6_dev *idev = ctl->extra1; 6008 6009 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6010 } 6011 6012 out: 6013 rtnl_unlock(); 6014 6015 return err; 6016 } 6017 6018 static 6019 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 6020 int write, 6021 void __user *buffer, 6022 size_t *lenp, 6023 loff_t *ppos) 6024 { 6025 int *valp = ctl->data; 6026 int val = *valp; 6027 loff_t pos = *ppos; 6028 struct ctl_table lctl; 6029 int ret; 6030 6031 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 6032 * we should not modify it until we get the rtnl lock. 6033 */ 6034 lctl = *ctl; 6035 lctl.data = &val; 6036 6037 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6038 6039 if (write) 6040 ret = addrconf_fixup_linkdown(ctl, valp, val); 6041 if (ret) 6042 *ppos = pos; 6043 return ret; 6044 } 6045 6046 static 6047 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 6048 { 6049 if (rt) { 6050 if (action) 6051 rt->dst.flags |= DST_NOPOLICY; 6052 else 6053 rt->dst.flags &= ~DST_NOPOLICY; 6054 } 6055 } 6056 6057 static 6058 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 6059 { 6060 struct inet6_ifaddr *ifa; 6061 6062 read_lock_bh(&idev->lock); 6063 list_for_each_entry(ifa, &idev->addr_list, if_list) { 6064 spin_lock(&ifa->lock); 6065 if (ifa->rt) { 6066 struct fib6_info *rt = ifa->rt; 6067 int cpu; 6068 6069 rcu_read_lock(); 6070 ifa->rt->dst_nopolicy = val ? true : false; 6071 if (rt->rt6i_pcpu) { 6072 for_each_possible_cpu(cpu) { 6073 struct rt6_info **rtp; 6074 6075 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu); 6076 addrconf_set_nopolicy(*rtp, val); 6077 } 6078 } 6079 rcu_read_unlock(); 6080 } 6081 spin_unlock(&ifa->lock); 6082 } 6083 read_unlock_bh(&idev->lock); 6084 } 6085 6086 static 6087 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 6088 { 6089 struct inet6_dev *idev; 6090 struct net *net; 6091 6092 if (!rtnl_trylock()) 6093 return restart_syscall(); 6094 6095 *valp = val; 6096 6097 net = (struct net *)ctl->extra2; 6098 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 6099 rtnl_unlock(); 6100 return 0; 6101 } 6102 6103 if (valp == &net->ipv6.devconf_all->disable_policy) { 6104 struct net_device *dev; 6105 6106 for_each_netdev(net, dev) { 6107 idev = __in6_dev_get(dev); 6108 if (idev) 6109 addrconf_disable_policy_idev(idev, val); 6110 } 6111 } else { 6112 idev = (struct inet6_dev *)ctl->extra1; 6113 addrconf_disable_policy_idev(idev, val); 6114 } 6115 6116 rtnl_unlock(); 6117 return 0; 6118 } 6119 6120 static 6121 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 6122 void __user *buffer, size_t *lenp, 6123 loff_t *ppos) 6124 { 6125 int *valp = ctl->data; 6126 int val = *valp; 6127 loff_t pos = *ppos; 6128 struct ctl_table lctl; 6129 int ret; 6130 6131 lctl = *ctl; 6132 lctl.data = &val; 6133 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6134 6135 if (write && (*valp != val)) 6136 ret = addrconf_disable_policy(ctl, valp, val); 6137 6138 if (ret) 6139 *ppos = pos; 6140 6141 return ret; 6142 } 6143 6144 static int minus_one = -1; 6145 static const int zero = 0; 6146 static const int one = 1; 6147 static const int two_five_five = 255; 6148 6149 static const struct ctl_table addrconf_sysctl[] = { 6150 { 6151 .procname = "forwarding", 6152 .data = &ipv6_devconf.forwarding, 6153 .maxlen = sizeof(int), 6154 .mode = 0644, 6155 .proc_handler = addrconf_sysctl_forward, 6156 }, 6157 { 6158 .procname = "hop_limit", 6159 .data = &ipv6_devconf.hop_limit, 6160 .maxlen = sizeof(int), 6161 .mode = 0644, 6162 .proc_handler = proc_dointvec_minmax, 6163 .extra1 = (void *)&one, 6164 .extra2 = (void *)&two_five_five, 6165 }, 6166 { 6167 .procname = "mtu", 6168 .data = &ipv6_devconf.mtu6, 6169 .maxlen = sizeof(int), 6170 .mode = 0644, 6171 .proc_handler = addrconf_sysctl_mtu, 6172 }, 6173 { 6174 .procname = "accept_ra", 6175 .data = &ipv6_devconf.accept_ra, 6176 .maxlen = sizeof(int), 6177 .mode = 0644, 6178 .proc_handler = proc_dointvec, 6179 }, 6180 { 6181 .procname = "accept_redirects", 6182 .data = &ipv6_devconf.accept_redirects, 6183 .maxlen = sizeof(int), 6184 .mode = 0644, 6185 .proc_handler = proc_dointvec, 6186 }, 6187 { 6188 .procname = "autoconf", 6189 .data = &ipv6_devconf.autoconf, 6190 .maxlen = sizeof(int), 6191 .mode = 0644, 6192 .proc_handler = proc_dointvec, 6193 }, 6194 { 6195 .procname = "dad_transmits", 6196 .data = &ipv6_devconf.dad_transmits, 6197 .maxlen = sizeof(int), 6198 .mode = 0644, 6199 .proc_handler = proc_dointvec, 6200 }, 6201 { 6202 .procname = "router_solicitations", 6203 .data = &ipv6_devconf.rtr_solicits, 6204 .maxlen = sizeof(int), 6205 .mode = 0644, 6206 .proc_handler = proc_dointvec_minmax, 6207 .extra1 = &minus_one, 6208 }, 6209 { 6210 .procname = "router_solicitation_interval", 6211 .data = &ipv6_devconf.rtr_solicit_interval, 6212 .maxlen = sizeof(int), 6213 .mode = 0644, 6214 .proc_handler = proc_dointvec_jiffies, 6215 }, 6216 { 6217 .procname = "router_solicitation_max_interval", 6218 .data = &ipv6_devconf.rtr_solicit_max_interval, 6219 .maxlen = sizeof(int), 6220 .mode = 0644, 6221 .proc_handler = proc_dointvec_jiffies, 6222 }, 6223 { 6224 .procname = "router_solicitation_delay", 6225 .data = &ipv6_devconf.rtr_solicit_delay, 6226 .maxlen = sizeof(int), 6227 .mode = 0644, 6228 .proc_handler = proc_dointvec_jiffies, 6229 }, 6230 { 6231 .procname = "force_mld_version", 6232 .data = &ipv6_devconf.force_mld_version, 6233 .maxlen = sizeof(int), 6234 .mode = 0644, 6235 .proc_handler = proc_dointvec, 6236 }, 6237 { 6238 .procname = "mldv1_unsolicited_report_interval", 6239 .data = 6240 &ipv6_devconf.mldv1_unsolicited_report_interval, 6241 .maxlen = sizeof(int), 6242 .mode = 0644, 6243 .proc_handler = proc_dointvec_ms_jiffies, 6244 }, 6245 { 6246 .procname = "mldv2_unsolicited_report_interval", 6247 .data = 6248 &ipv6_devconf.mldv2_unsolicited_report_interval, 6249 .maxlen = sizeof(int), 6250 .mode = 0644, 6251 .proc_handler = proc_dointvec_ms_jiffies, 6252 }, 6253 { 6254 .procname = "use_tempaddr", 6255 .data = &ipv6_devconf.use_tempaddr, 6256 .maxlen = sizeof(int), 6257 .mode = 0644, 6258 .proc_handler = proc_dointvec, 6259 }, 6260 { 6261 .procname = "temp_valid_lft", 6262 .data = &ipv6_devconf.temp_valid_lft, 6263 .maxlen = sizeof(int), 6264 .mode = 0644, 6265 .proc_handler = proc_dointvec, 6266 }, 6267 { 6268 .procname = "temp_prefered_lft", 6269 .data = &ipv6_devconf.temp_prefered_lft, 6270 .maxlen = sizeof(int), 6271 .mode = 0644, 6272 .proc_handler = proc_dointvec, 6273 }, 6274 { 6275 .procname = "regen_max_retry", 6276 .data = &ipv6_devconf.regen_max_retry, 6277 .maxlen = sizeof(int), 6278 .mode = 0644, 6279 .proc_handler = proc_dointvec, 6280 }, 6281 { 6282 .procname = "max_desync_factor", 6283 .data = &ipv6_devconf.max_desync_factor, 6284 .maxlen = sizeof(int), 6285 .mode = 0644, 6286 .proc_handler = proc_dointvec, 6287 }, 6288 { 6289 .procname = "max_addresses", 6290 .data = &ipv6_devconf.max_addresses, 6291 .maxlen = sizeof(int), 6292 .mode = 0644, 6293 .proc_handler = proc_dointvec, 6294 }, 6295 { 6296 .procname = "accept_ra_defrtr", 6297 .data = &ipv6_devconf.accept_ra_defrtr, 6298 .maxlen = sizeof(int), 6299 .mode = 0644, 6300 .proc_handler = proc_dointvec, 6301 }, 6302 { 6303 .procname = "accept_ra_min_hop_limit", 6304 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6305 .maxlen = sizeof(int), 6306 .mode = 0644, 6307 .proc_handler = proc_dointvec, 6308 }, 6309 { 6310 .procname = "accept_ra_pinfo", 6311 .data = &ipv6_devconf.accept_ra_pinfo, 6312 .maxlen = sizeof(int), 6313 .mode = 0644, 6314 .proc_handler = proc_dointvec, 6315 }, 6316 #ifdef CONFIG_IPV6_ROUTER_PREF 6317 { 6318 .procname = "accept_ra_rtr_pref", 6319 .data = &ipv6_devconf.accept_ra_rtr_pref, 6320 .maxlen = sizeof(int), 6321 .mode = 0644, 6322 .proc_handler = proc_dointvec, 6323 }, 6324 { 6325 .procname = "router_probe_interval", 6326 .data = &ipv6_devconf.rtr_probe_interval, 6327 .maxlen = sizeof(int), 6328 .mode = 0644, 6329 .proc_handler = proc_dointvec_jiffies, 6330 }, 6331 #ifdef CONFIG_IPV6_ROUTE_INFO 6332 { 6333 .procname = "accept_ra_rt_info_min_plen", 6334 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6335 .maxlen = sizeof(int), 6336 .mode = 0644, 6337 .proc_handler = proc_dointvec, 6338 }, 6339 { 6340 .procname = "accept_ra_rt_info_max_plen", 6341 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6342 .maxlen = sizeof(int), 6343 .mode = 0644, 6344 .proc_handler = proc_dointvec, 6345 }, 6346 #endif 6347 #endif 6348 { 6349 .procname = "proxy_ndp", 6350 .data = &ipv6_devconf.proxy_ndp, 6351 .maxlen = sizeof(int), 6352 .mode = 0644, 6353 .proc_handler = addrconf_sysctl_proxy_ndp, 6354 }, 6355 { 6356 .procname = "accept_source_route", 6357 .data = &ipv6_devconf.accept_source_route, 6358 .maxlen = sizeof(int), 6359 .mode = 0644, 6360 .proc_handler = proc_dointvec, 6361 }, 6362 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6363 { 6364 .procname = "optimistic_dad", 6365 .data = &ipv6_devconf.optimistic_dad, 6366 .maxlen = sizeof(int), 6367 .mode = 0644, 6368 .proc_handler = proc_dointvec, 6369 }, 6370 { 6371 .procname = "use_optimistic", 6372 .data = &ipv6_devconf.use_optimistic, 6373 .maxlen = sizeof(int), 6374 .mode = 0644, 6375 .proc_handler = proc_dointvec, 6376 }, 6377 #endif 6378 #ifdef CONFIG_IPV6_MROUTE 6379 { 6380 .procname = "mc_forwarding", 6381 .data = &ipv6_devconf.mc_forwarding, 6382 .maxlen = sizeof(int), 6383 .mode = 0444, 6384 .proc_handler = proc_dointvec, 6385 }, 6386 #endif 6387 { 6388 .procname = "disable_ipv6", 6389 .data = &ipv6_devconf.disable_ipv6, 6390 .maxlen = sizeof(int), 6391 .mode = 0644, 6392 .proc_handler = addrconf_sysctl_disable, 6393 }, 6394 { 6395 .procname = "accept_dad", 6396 .data = &ipv6_devconf.accept_dad, 6397 .maxlen = sizeof(int), 6398 .mode = 0644, 6399 .proc_handler = proc_dointvec, 6400 }, 6401 { 6402 .procname = "force_tllao", 6403 .data = &ipv6_devconf.force_tllao, 6404 .maxlen = sizeof(int), 6405 .mode = 0644, 6406 .proc_handler = proc_dointvec 6407 }, 6408 { 6409 .procname = "ndisc_notify", 6410 .data = &ipv6_devconf.ndisc_notify, 6411 .maxlen = sizeof(int), 6412 .mode = 0644, 6413 .proc_handler = proc_dointvec 6414 }, 6415 { 6416 .procname = "suppress_frag_ndisc", 6417 .data = &ipv6_devconf.suppress_frag_ndisc, 6418 .maxlen = sizeof(int), 6419 .mode = 0644, 6420 .proc_handler = proc_dointvec 6421 }, 6422 { 6423 .procname = "accept_ra_from_local", 6424 .data = &ipv6_devconf.accept_ra_from_local, 6425 .maxlen = sizeof(int), 6426 .mode = 0644, 6427 .proc_handler = proc_dointvec, 6428 }, 6429 { 6430 .procname = "accept_ra_mtu", 6431 .data = &ipv6_devconf.accept_ra_mtu, 6432 .maxlen = sizeof(int), 6433 .mode = 0644, 6434 .proc_handler = proc_dointvec, 6435 }, 6436 { 6437 .procname = "stable_secret", 6438 .data = &ipv6_devconf.stable_secret, 6439 .maxlen = IPV6_MAX_STRLEN, 6440 .mode = 0600, 6441 .proc_handler = addrconf_sysctl_stable_secret, 6442 }, 6443 { 6444 .procname = "use_oif_addrs_only", 6445 .data = &ipv6_devconf.use_oif_addrs_only, 6446 .maxlen = sizeof(int), 6447 .mode = 0644, 6448 .proc_handler = proc_dointvec, 6449 }, 6450 { 6451 .procname = "ignore_routes_with_linkdown", 6452 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6453 .maxlen = sizeof(int), 6454 .mode = 0644, 6455 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6456 }, 6457 { 6458 .procname = "drop_unicast_in_l2_multicast", 6459 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6460 .maxlen = sizeof(int), 6461 .mode = 0644, 6462 .proc_handler = proc_dointvec, 6463 }, 6464 { 6465 .procname = "drop_unsolicited_na", 6466 .data = &ipv6_devconf.drop_unsolicited_na, 6467 .maxlen = sizeof(int), 6468 .mode = 0644, 6469 .proc_handler = proc_dointvec, 6470 }, 6471 { 6472 .procname = "keep_addr_on_down", 6473 .data = &ipv6_devconf.keep_addr_on_down, 6474 .maxlen = sizeof(int), 6475 .mode = 0644, 6476 .proc_handler = proc_dointvec, 6477 6478 }, 6479 { 6480 .procname = "seg6_enabled", 6481 .data = &ipv6_devconf.seg6_enabled, 6482 .maxlen = sizeof(int), 6483 .mode = 0644, 6484 .proc_handler = proc_dointvec, 6485 }, 6486 #ifdef CONFIG_IPV6_SEG6_HMAC 6487 { 6488 .procname = "seg6_require_hmac", 6489 .data = &ipv6_devconf.seg6_require_hmac, 6490 .maxlen = sizeof(int), 6491 .mode = 0644, 6492 .proc_handler = proc_dointvec, 6493 }, 6494 #endif 6495 { 6496 .procname = "enhanced_dad", 6497 .data = &ipv6_devconf.enhanced_dad, 6498 .maxlen = sizeof(int), 6499 .mode = 0644, 6500 .proc_handler = proc_dointvec, 6501 }, 6502 { 6503 .procname = "addr_gen_mode", 6504 .data = &ipv6_devconf.addr_gen_mode, 6505 .maxlen = sizeof(int), 6506 .mode = 0644, 6507 .proc_handler = addrconf_sysctl_addr_gen_mode, 6508 }, 6509 { 6510 .procname = "disable_policy", 6511 .data = &ipv6_devconf.disable_policy, 6512 .maxlen = sizeof(int), 6513 .mode = 0644, 6514 .proc_handler = addrconf_sysctl_disable_policy, 6515 }, 6516 { 6517 .procname = "ndisc_tclass", 6518 .data = &ipv6_devconf.ndisc_tclass, 6519 .maxlen = sizeof(int), 6520 .mode = 0644, 6521 .proc_handler = proc_dointvec_minmax, 6522 .extra1 = (void *)&zero, 6523 .extra2 = (void *)&two_five_five, 6524 }, 6525 { 6526 /* sentinel */ 6527 } 6528 }; 6529 6530 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 6531 struct inet6_dev *idev, struct ipv6_devconf *p) 6532 { 6533 int i, ifindex; 6534 struct ctl_table *table; 6535 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 6536 6537 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 6538 if (!table) 6539 goto out; 6540 6541 for (i = 0; table[i].data; i++) { 6542 table[i].data += (char *)p - (char *)&ipv6_devconf; 6543 /* If one of these is already set, then it is not safe to 6544 * overwrite either of them: this makes proc_dointvec_minmax 6545 * usable. 6546 */ 6547 if (!table[i].extra1 && !table[i].extra2) { 6548 table[i].extra1 = idev; /* embedded; no ref */ 6549 table[i].extra2 = net; 6550 } 6551 } 6552 6553 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 6554 6555 p->sysctl_header = register_net_sysctl(net, path, table); 6556 if (!p->sysctl_header) 6557 goto free; 6558 6559 if (!strcmp(dev_name, "all")) 6560 ifindex = NETCONFA_IFINDEX_ALL; 6561 else if (!strcmp(dev_name, "default")) 6562 ifindex = NETCONFA_IFINDEX_DEFAULT; 6563 else 6564 ifindex = idev->dev->ifindex; 6565 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 6566 ifindex, p); 6567 return 0; 6568 6569 free: 6570 kfree(table); 6571 out: 6572 return -ENOBUFS; 6573 } 6574 6575 static void __addrconf_sysctl_unregister(struct net *net, 6576 struct ipv6_devconf *p, int ifindex) 6577 { 6578 struct ctl_table *table; 6579 6580 if (!p->sysctl_header) 6581 return; 6582 6583 table = p->sysctl_header->ctl_table_arg; 6584 unregister_net_sysctl_table(p->sysctl_header); 6585 p->sysctl_header = NULL; 6586 kfree(table); 6587 6588 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 6589 } 6590 6591 static int addrconf_sysctl_register(struct inet6_dev *idev) 6592 { 6593 int err; 6594 6595 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 6596 return -EINVAL; 6597 6598 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 6599 &ndisc_ifinfo_sysctl_change); 6600 if (err) 6601 return err; 6602 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 6603 idev, &idev->cnf); 6604 if (err) 6605 neigh_sysctl_unregister(idev->nd_parms); 6606 6607 return err; 6608 } 6609 6610 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 6611 { 6612 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 6613 idev->dev->ifindex); 6614 neigh_sysctl_unregister(idev->nd_parms); 6615 } 6616 6617 6618 #endif 6619 6620 static int __net_init addrconf_init_net(struct net *net) 6621 { 6622 int err = -ENOMEM; 6623 struct ipv6_devconf *all, *dflt; 6624 6625 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 6626 if (!all) 6627 goto err_alloc_all; 6628 6629 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 6630 if (!dflt) 6631 goto err_alloc_dflt; 6632 6633 /* these will be inherited by all namespaces */ 6634 dflt->autoconf = ipv6_defaults.autoconf; 6635 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 6636 6637 dflt->stable_secret.initialized = false; 6638 all->stable_secret.initialized = false; 6639 6640 net->ipv6.devconf_all = all; 6641 net->ipv6.devconf_dflt = dflt; 6642 6643 #ifdef CONFIG_SYSCTL 6644 err = __addrconf_sysctl_register(net, "all", NULL, all); 6645 if (err < 0) 6646 goto err_reg_all; 6647 6648 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 6649 if (err < 0) 6650 goto err_reg_dflt; 6651 #endif 6652 return 0; 6653 6654 #ifdef CONFIG_SYSCTL 6655 err_reg_dflt: 6656 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 6657 err_reg_all: 6658 kfree(dflt); 6659 #endif 6660 err_alloc_dflt: 6661 kfree(all); 6662 err_alloc_all: 6663 return err; 6664 } 6665 6666 static void __net_exit addrconf_exit_net(struct net *net) 6667 { 6668 #ifdef CONFIG_SYSCTL 6669 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 6670 NETCONFA_IFINDEX_DEFAULT); 6671 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 6672 NETCONFA_IFINDEX_ALL); 6673 #endif 6674 kfree(net->ipv6.devconf_dflt); 6675 kfree(net->ipv6.devconf_all); 6676 } 6677 6678 static struct pernet_operations addrconf_ops = { 6679 .init = addrconf_init_net, 6680 .exit = addrconf_exit_net, 6681 }; 6682 6683 static struct rtnl_af_ops inet6_ops __read_mostly = { 6684 .family = AF_INET6, 6685 .fill_link_af = inet6_fill_link_af, 6686 .get_link_af_size = inet6_get_link_af_size, 6687 .validate_link_af = inet6_validate_link_af, 6688 .set_link_af = inet6_set_link_af, 6689 }; 6690 6691 /* 6692 * Init / cleanup code 6693 */ 6694 6695 int __init addrconf_init(void) 6696 { 6697 struct inet6_dev *idev; 6698 int i, err; 6699 6700 err = ipv6_addr_label_init(); 6701 if (err < 0) { 6702 pr_crit("%s: cannot initialize default policy table: %d\n", 6703 __func__, err); 6704 goto out; 6705 } 6706 6707 err = register_pernet_subsys(&addrconf_ops); 6708 if (err < 0) 6709 goto out_addrlabel; 6710 6711 addrconf_wq = create_workqueue("ipv6_addrconf"); 6712 if (!addrconf_wq) { 6713 err = -ENOMEM; 6714 goto out_nowq; 6715 } 6716 6717 /* The addrconf netdev notifier requires that loopback_dev 6718 * has it's ipv6 private information allocated and setup 6719 * before it can bring up and give link-local addresses 6720 * to other devices which are up. 6721 * 6722 * Unfortunately, loopback_dev is not necessarily the first 6723 * entry in the global dev_base list of net devices. In fact, 6724 * it is likely to be the very last entry on that list. 6725 * So this causes the notifier registry below to try and 6726 * give link-local addresses to all devices besides loopback_dev 6727 * first, then loopback_dev, which cases all the non-loopback_dev 6728 * devices to fail to get a link-local address. 6729 * 6730 * So, as a temporary fix, allocate the ipv6 structure for 6731 * loopback_dev first by hand. 6732 * Longer term, all of the dependencies ipv6 has upon the loopback 6733 * device and it being up should be removed. 6734 */ 6735 rtnl_lock(); 6736 idev = ipv6_add_dev(init_net.loopback_dev); 6737 rtnl_unlock(); 6738 if (IS_ERR(idev)) { 6739 err = PTR_ERR(idev); 6740 goto errlo; 6741 } 6742 6743 ip6_route_init_special_entries(); 6744 6745 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6746 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 6747 6748 register_netdevice_notifier(&ipv6_dev_notf); 6749 6750 addrconf_verify(); 6751 6752 rtnl_af_register(&inet6_ops); 6753 6754 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK, 6755 NULL, inet6_dump_ifinfo, 0); 6756 if (err < 0) 6757 goto errout; 6758 6759 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR, 6760 inet6_rtm_newaddr, NULL, 0); 6761 if (err < 0) 6762 goto errout; 6763 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR, 6764 inet6_rtm_deladdr, NULL, 0); 6765 if (err < 0) 6766 goto errout; 6767 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR, 6768 inet6_rtm_getaddr, inet6_dump_ifaddr, 6769 RTNL_FLAG_DOIT_UNLOCKED); 6770 if (err < 0) 6771 goto errout; 6772 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST, 6773 NULL, inet6_dump_ifmcaddr, 0); 6774 if (err < 0) 6775 goto errout; 6776 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST, 6777 NULL, inet6_dump_ifacaddr, 0); 6778 if (err < 0) 6779 goto errout; 6780 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF, 6781 inet6_netconf_get_devconf, 6782 inet6_netconf_dump_devconf, 6783 RTNL_FLAG_DOIT_UNLOCKED); 6784 if (err < 0) 6785 goto errout; 6786 err = ipv6_addr_label_rtnl_register(); 6787 if (err < 0) 6788 goto errout; 6789 6790 return 0; 6791 errout: 6792 rtnl_unregister_all(PF_INET6); 6793 rtnl_af_unregister(&inet6_ops); 6794 unregister_netdevice_notifier(&ipv6_dev_notf); 6795 errlo: 6796 destroy_workqueue(addrconf_wq); 6797 out_nowq: 6798 unregister_pernet_subsys(&addrconf_ops); 6799 out_addrlabel: 6800 ipv6_addr_label_cleanup(); 6801 out: 6802 return err; 6803 } 6804 6805 void addrconf_cleanup(void) 6806 { 6807 struct net_device *dev; 6808 int i; 6809 6810 unregister_netdevice_notifier(&ipv6_dev_notf); 6811 unregister_pernet_subsys(&addrconf_ops); 6812 ipv6_addr_label_cleanup(); 6813 6814 rtnl_af_unregister(&inet6_ops); 6815 6816 rtnl_lock(); 6817 6818 /* clean dev list */ 6819 for_each_netdev(&init_net, dev) { 6820 if (__in6_dev_get(dev) == NULL) 6821 continue; 6822 addrconf_ifdown(dev, 1); 6823 } 6824 addrconf_ifdown(init_net.loopback_dev, 2); 6825 6826 /* 6827 * Check hash table. 6828 */ 6829 spin_lock_bh(&addrconf_hash_lock); 6830 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6831 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 6832 spin_unlock_bh(&addrconf_hash_lock); 6833 cancel_delayed_work(&addr_chk_work); 6834 rtnl_unlock(); 6835 6836 destroy_workqueue(addrconf_wq); 6837 } 6838