1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * IPv6 Address [auto]configuration 4 * Linux INET6 implementation 5 * 6 * Authors: 7 * Pedro Roque <roque@di.fc.ul.pt> 8 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 9 */ 10 11/* 12 * Changes: 13 * 14 * Janos Farkas : delete timer on ifdown 15 * <chexum@bankinf.banki.hu> 16 * Andi Kleen : kill double kfree on module 17 * unload. 18 * Maciej W. Rozycki : FDDI support 19 * sekiya@USAGI : Don't send too many RS 20 * packets. 21 * yoshfuji@USAGI : Fixed interval between DAD 22 * packets. 23 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 24 * address validation timer. 25 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 26 * support. 27 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 28 * address on a same interface. 29 * YOSHIFUJI Hideaki @USAGI : ARCnet support 30 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 31 * seq_file. 32 * YOSHIFUJI Hideaki @USAGI : improved source address 33 * selection; consider scope, 34 * status etc. 35 */ 36 37#define pr_fmt(fmt) "IPv6: " fmt 38 39#include <linux/errno.h> 40#include <linux/types.h> 41#include <linux/kernel.h> 42#include <linux/sched/signal.h> 43#include <linux/socket.h> 44#include <linux/sockios.h> 45#include <linux/net.h> 46#include <linux/inet.h> 47#include <linux/in6.h> 48#include <linux/netdevice.h> 49#include <linux/if_addr.h> 50#include <linux/if_arp.h> 51#include <linux/if_arcnet.h> 52#include <linux/if_infiniband.h> 53#include <linux/route.h> 54#include <linux/inetdevice.h> 55#include <linux/init.h> 56#include <linux/slab.h> 57#ifdef CONFIG_SYSCTL 58#include <linux/sysctl.h> 59#endif 60#include <linux/capability.h> 61#include <linux/delay.h> 62#include <linux/notifier.h> 63#include <linux/string.h> 64#include <linux/hash.h> 65 66#include <net/net_namespace.h> 67#include <net/sock.h> 68#include <net/snmp.h> 69 70#include <net/6lowpan.h> 71#include <net/firewire.h> 72#include <net/ipv6.h> 73#include <net/protocol.h> 74#include <net/ndisc.h> 75#include <net/ip6_route.h> 76#include <net/addrconf.h> 77#include <net/tcp.h> 78#include <net/ip.h> 79#include <net/netlink.h> 80#include <net/pkt_sched.h> 81#include <net/l3mdev.h> 82#include <linux/if_tunnel.h> 83#include <linux/rtnetlink.h> 84#include <linux/netconf.h> 85#include <linux/random.h> 86#include <linux/uaccess.h> 87#include <asm/unaligned.h> 88 89#include <linux/proc_fs.h> 90#include <linux/seq_file.h> 91#include <linux/export.h> 92 93#define INFINITY_LIFE_TIME 0xFFFFFFFF 94 95#define IPV6_MAX_STRLEN \ 96 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") 97 98static inline u32 cstamp_delta(unsigned long cstamp) 99{ 100 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 101} 102 103static inline s32 rfc3315_s14_backoff_init(s32 irt) 104{ 105 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */ 106 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt; 107 do_div(tmp, 1000000); 108 return (s32)tmp; 109} 110 111static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt) 112{ 113 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */ 114 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt; 115 do_div(tmp, 1000000); 116 if ((s32)tmp > mrt) { 117 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */ 118 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt; 119 do_div(tmp, 1000000); 120 } 121 return (s32)tmp; 122} 123 124#ifdef CONFIG_SYSCTL 125static int addrconf_sysctl_register(struct inet6_dev *idev); 126static void addrconf_sysctl_unregister(struct inet6_dev *idev); 127#else 128static inline int addrconf_sysctl_register(struct inet6_dev *idev) 129{ 130 return 0; 131} 132 133static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 134{ 135} 136#endif 137 138static void ipv6_gen_rnd_iid(struct in6_addr *addr); 139 140static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 141static int ipv6_count_addresses(const struct inet6_dev *idev); 142static int ipv6_generate_stable_address(struct in6_addr *addr, 143 u8 dad_count, 144 const struct inet6_dev *idev); 145 146#define IN6_ADDR_HSIZE_SHIFT 8 147#define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT) 148/* 149 * Configured unicast address hash table 150 */ 151static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 152static DEFINE_SPINLOCK(addrconf_hash_lock); 153 154static void addrconf_verify(void); 155static void addrconf_verify_rtnl(void); 156static void addrconf_verify_work(struct work_struct *); 157 158static struct workqueue_struct *addrconf_wq; 159static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work); 160 161static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 162static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 163 164static void addrconf_type_change(struct net_device *dev, 165 unsigned long event); 166static int addrconf_ifdown(struct net_device *dev, bool unregister); 167 168static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 169 int plen, 170 const struct net_device *dev, 171 u32 flags, u32 noflags, 172 bool no_gw); 173 174static void addrconf_dad_start(struct inet6_ifaddr *ifp); 175static void addrconf_dad_work(struct work_struct *w); 176static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 177 bool send_na); 178static void addrconf_dad_run(struct inet6_dev *idev, bool restart); 179static void addrconf_rs_timer(struct timer_list *t); 180static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 181static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 182 183static void inet6_prefix_notify(int event, struct inet6_dev *idev, 184 struct prefix_info *pinfo); 185 186static struct ipv6_devconf ipv6_devconf __read_mostly = { 187 .forwarding = 0, 188 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 189 .mtu6 = IPV6_MIN_MTU, 190 .accept_ra = 1, 191 .accept_redirects = 1, 192 .autoconf = 1, 193 .force_mld_version = 0, 194 .mldv1_unsolicited_report_interval = 10 * HZ, 195 .mldv2_unsolicited_report_interval = HZ, 196 .dad_transmits = 1, 197 .rtr_solicits = MAX_RTR_SOLICITATIONS, 198 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 199 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 200 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 201 .use_tempaddr = 0, 202 .temp_valid_lft = TEMP_VALID_LIFETIME, 203 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 204 .regen_max_retry = REGEN_MAX_RETRY, 205 .max_desync_factor = MAX_DESYNC_FACTOR, 206 .max_addresses = IPV6_MAX_ADDRESSES, 207 .accept_ra_defrtr = 1, 208 .accept_ra_from_local = 0, 209 .accept_ra_min_hop_limit= 1, 210 .accept_ra_min_lft = 0, 211 .accept_ra_pinfo = 1, 212#ifdef CONFIG_IPV6_ROUTER_PREF 213 .accept_ra_rtr_pref = 1, 214 .rtr_probe_interval = 60 * HZ, 215#ifdef CONFIG_IPV6_ROUTE_INFO 216 .accept_ra_rt_info_min_plen = 0, 217 .accept_ra_rt_info_max_plen = 0, 218#endif 219#endif 220 .proxy_ndp = 0, 221 .accept_source_route = 0, /* we do not accept RH0 by default. */ 222 .disable_ipv6 = 0, 223 .accept_dad = 0, 224 .suppress_frag_ndisc = 1, 225 .accept_ra_mtu = 1, 226 .stable_secret = { 227 .initialized = false, 228 }, 229 .use_oif_addrs_only = 0, 230 .ignore_routes_with_linkdown = 0, 231 .keep_addr_on_down = 0, 232 .seg6_enabled = 0, 233#ifdef CONFIG_IPV6_SEG6_HMAC 234 .seg6_require_hmac = 0, 235#endif 236 .enhanced_dad = 1, 237 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 238 .disable_policy = 0, 239 .rpl_seg_enabled = 0, 240}; 241 242static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 243 .forwarding = 0, 244 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 245 .mtu6 = IPV6_MIN_MTU, 246 .accept_ra = 1, 247 .accept_redirects = 1, 248 .autoconf = 1, 249 .force_mld_version = 0, 250 .mldv1_unsolicited_report_interval = 10 * HZ, 251 .mldv2_unsolicited_report_interval = HZ, 252 .dad_transmits = 1, 253 .rtr_solicits = MAX_RTR_SOLICITATIONS, 254 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 255 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 256 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 257 .use_tempaddr = 0, 258 .temp_valid_lft = TEMP_VALID_LIFETIME, 259 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 260 .regen_max_retry = REGEN_MAX_RETRY, 261 .max_desync_factor = MAX_DESYNC_FACTOR, 262 .max_addresses = IPV6_MAX_ADDRESSES, 263 .accept_ra_defrtr = 1, 264 .accept_ra_from_local = 0, 265 .accept_ra_min_hop_limit= 1, 266 .accept_ra_min_lft = 0, 267 .accept_ra_pinfo = 1, 268#ifdef CONFIG_IPV6_ROUTER_PREF 269 .accept_ra_rtr_pref = 1, 270 .rtr_probe_interval = 60 * HZ, 271#ifdef CONFIG_IPV6_ROUTE_INFO 272 .accept_ra_rt_info_min_plen = 0, 273 .accept_ra_rt_info_max_plen = 0, 274#endif 275#endif 276 .proxy_ndp = 0, 277 .accept_source_route = 0, /* we do not accept RH0 by default. */ 278 .disable_ipv6 = 0, 279 .accept_dad = 1, 280 .suppress_frag_ndisc = 1, 281 .accept_ra_mtu = 1, 282 .stable_secret = { 283 .initialized = false, 284 }, 285 .use_oif_addrs_only = 0, 286 .ignore_routes_with_linkdown = 0, 287 .keep_addr_on_down = 0, 288 .seg6_enabled = 0, 289#ifdef CONFIG_IPV6_SEG6_HMAC 290 .seg6_require_hmac = 0, 291#endif 292 .enhanced_dad = 1, 293 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 294 .disable_policy = 0, 295 .rpl_seg_enabled = 0, 296}; 297 298/* Check if link is ready: is it up and is a valid qdisc available */ 299static inline bool addrconf_link_ready(const struct net_device *dev) 300{ 301 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev); 302} 303 304static void addrconf_del_rs_timer(struct inet6_dev *idev) 305{ 306 if (del_timer(&idev->rs_timer)) 307 __in6_dev_put(idev); 308} 309 310static 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 316static void addrconf_mod_rs_timer(struct inet6_dev *idev, 317 unsigned long when) 318{ 319 if (!mod_timer(&idev->rs_timer, jiffies + when)) 320 in6_dev_hold(idev); 321} 322 323static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 324 unsigned long delay) 325{ 326 in6_ifa_hold(ifp); 327 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay)) 328 in6_ifa_put(ifp); 329} 330 331static int snmp6_alloc_dev(struct inet6_dev *idev) 332{ 333 int i; 334 335 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib); 336 if (!idev->stats.ipv6) 337 goto err_ip; 338 339 for_each_possible_cpu(i) { 340 struct ipstats_mib *addrconf_stats; 341 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 342 u64_stats_init(&addrconf_stats->syncp); 343 } 344 345 346 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 347 GFP_KERNEL); 348 if (!idev->stats.icmpv6dev) 349 goto err_icmp; 350 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 351 GFP_KERNEL); 352 if (!idev->stats.icmpv6msgdev) 353 goto err_icmpmsg; 354 355 return 0; 356 357err_icmpmsg: 358 kfree(idev->stats.icmpv6dev); 359err_icmp: 360 free_percpu(idev->stats.ipv6); 361err_ip: 362 return -ENOMEM; 363} 364 365static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 366{ 367 struct inet6_dev *ndev; 368 int err = -ENOMEM; 369 370 ASSERT_RTNL(); 371 372 if (dev->mtu < IPV6_MIN_MTU) 373 return ERR_PTR(-EINVAL); 374 375 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 376 if (!ndev) 377 return ERR_PTR(err); 378 379 rwlock_init(&ndev->lock); 380 ndev->dev = dev; 381 INIT_LIST_HEAD(&ndev->addr_list); 382 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0); 383 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 384 385 if (ndev->cnf.stable_secret.initialized) 386 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 387 388 ndev->cnf.mtu6 = dev->mtu; 389 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 390 if (!ndev->nd_parms) { 391 kfree(ndev); 392 return ERR_PTR(err); 393 } 394 if (ndev->cnf.forwarding) 395 dev_disable_lro(dev); 396 /* We refer to the device */ 397 dev_hold(dev); 398 399 if (snmp6_alloc_dev(ndev) < 0) { 400 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n", 401 __func__); 402 neigh_parms_release(&nd_tbl, ndev->nd_parms); 403 dev_put(dev); 404 kfree(ndev); 405 return ERR_PTR(err); 406 } 407 408 if (snmp6_register_dev(ndev) < 0) { 409 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n", 410 __func__, dev->name); 411 goto err_release; 412 } 413 414 /* One reference from device. */ 415 refcount_set(&ndev->refcnt, 1); 416 417 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 418 ndev->cnf.accept_dad = -1; 419 420#if IS_ENABLED(CONFIG_IPV6_SIT) 421 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 422 pr_info("%s: Disabled Multicast RS\n", dev->name); 423 ndev->cnf.rtr_solicits = 0; 424 } 425#endif 426 427 INIT_LIST_HEAD(&ndev->tempaddr_list); 428 ndev->desync_factor = U32_MAX; 429 if ((dev->flags&IFF_LOOPBACK) || 430 dev->type == ARPHRD_TUNNEL || 431 dev->type == ARPHRD_TUNNEL6 || 432 dev->type == ARPHRD_SIT || 433 dev->type == ARPHRD_NONE) { 434 ndev->cnf.use_tempaddr = -1; 435 } 436 437 ndev->token = in6addr_any; 438 439 if (netif_running(dev) && addrconf_link_ready(dev)) 440 ndev->if_flags |= IF_READY; 441 442 ipv6_mc_init_dev(ndev); 443 ndev->tstamp = jiffies; 444 err = addrconf_sysctl_register(ndev); 445 if (err) { 446 ipv6_mc_destroy_dev(ndev); 447 snmp6_unregister_dev(ndev); 448 goto err_release; 449 } 450 /* protected by rtnl_lock */ 451 rcu_assign_pointer(dev->ip6_ptr, ndev); 452 453 /* Join interface-local all-node multicast group */ 454 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 455 456 /* Join all-node multicast group */ 457 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 458 459 /* Join all-router multicast group if forwarding is set */ 460 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 461 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 462 463 return ndev; 464 465err_release: 466 neigh_parms_release(&nd_tbl, ndev->nd_parms); 467 ndev->dead = 1; 468 in6_dev_finish_destroy(ndev); 469 return ERR_PTR(err); 470} 471 472static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 473{ 474 struct inet6_dev *idev; 475 476 ASSERT_RTNL(); 477 478 idev = __in6_dev_get(dev); 479 if (!idev) { 480 idev = ipv6_add_dev(dev); 481 if (IS_ERR(idev)) 482 return idev; 483 } 484 485 if (dev->flags&IFF_UP) 486 ipv6_mc_up(idev); 487 return idev; 488} 489 490static int inet6_netconf_msgsize_devconf(int type) 491{ 492 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 493 + nla_total_size(4); /* NETCONFA_IFINDEX */ 494 bool all = false; 495 496 if (type == NETCONFA_ALL) 497 all = true; 498 499 if (all || type == NETCONFA_FORWARDING) 500 size += nla_total_size(4); 501#ifdef CONFIG_IPV6_MROUTE 502 if (all || type == NETCONFA_MC_FORWARDING) 503 size += nla_total_size(4); 504#endif 505 if (all || type == NETCONFA_PROXY_NEIGH) 506 size += nla_total_size(4); 507 508 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 509 size += nla_total_size(4); 510 511 return size; 512} 513 514static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 515 struct ipv6_devconf *devconf, u32 portid, 516 u32 seq, int event, unsigned int flags, 517 int type) 518{ 519 struct nlmsghdr *nlh; 520 struct netconfmsg *ncm; 521 bool all = false; 522 523 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 524 flags); 525 if (!nlh) 526 return -EMSGSIZE; 527 528 if (type == NETCONFA_ALL) 529 all = true; 530 531 ncm = nlmsg_data(nlh); 532 ncm->ncm_family = AF_INET6; 533 534 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 535 goto nla_put_failure; 536 537 if (!devconf) 538 goto out; 539 540 if ((all || type == NETCONFA_FORWARDING) && 541 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 542 goto nla_put_failure; 543#ifdef CONFIG_IPV6_MROUTE 544 if ((all || type == NETCONFA_MC_FORWARDING) && 545 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 546 atomic_read(&devconf->mc_forwarding)) < 0) 547 goto nla_put_failure; 548#endif 549 if ((all || type == NETCONFA_PROXY_NEIGH) && 550 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 551 goto nla_put_failure; 552 553 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 554 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 555 devconf->ignore_routes_with_linkdown) < 0) 556 goto nla_put_failure; 557 558out: 559 nlmsg_end(skb, nlh); 560 return 0; 561 562nla_put_failure: 563 nlmsg_cancel(skb, nlh); 564 return -EMSGSIZE; 565} 566 567void inet6_netconf_notify_devconf(struct net *net, int event, int type, 568 int ifindex, struct ipv6_devconf *devconf) 569{ 570 struct sk_buff *skb; 571 int err = -ENOBUFS; 572 573 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL); 574 if (!skb) 575 goto errout; 576 577 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 578 event, 0, type); 579 if (err < 0) { 580 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 581 WARN_ON(err == -EMSGSIZE); 582 kfree_skb(skb); 583 goto errout; 584 } 585 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL); 586 return; 587errout: 588 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 589} 590 591static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 592 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 593 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 594 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 595 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 596}; 597 598static int inet6_netconf_valid_get_req(struct sk_buff *skb, 599 const struct nlmsghdr *nlh, 600 struct nlattr **tb, 601 struct netlink_ext_ack *extack) 602{ 603 int i, err; 604 605 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) { 606 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request"); 607 return -EINVAL; 608 } 609 610 if (!netlink_strict_get_check(skb)) 611 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg), 612 tb, NETCONFA_MAX, 613 devconf_ipv6_policy, extack); 614 615 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg), 616 tb, NETCONFA_MAX, 617 devconf_ipv6_policy, extack); 618 if (err) 619 return err; 620 621 for (i = 0; i <= NETCONFA_MAX; i++) { 622 if (!tb[i]) 623 continue; 624 625 switch (i) { 626 case NETCONFA_IFINDEX: 627 break; 628 default: 629 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request"); 630 return -EINVAL; 631 } 632 } 633 634 return 0; 635} 636 637static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 638 struct nlmsghdr *nlh, 639 struct netlink_ext_ack *extack) 640{ 641 struct net *net = sock_net(in_skb->sk); 642 struct nlattr *tb[NETCONFA_MAX+1]; 643 struct inet6_dev *in6_dev = NULL; 644 struct net_device *dev = NULL; 645 struct sk_buff *skb; 646 struct ipv6_devconf *devconf; 647 int ifindex; 648 int err; 649 650 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack); 651 if (err < 0) 652 return err; 653 654 if (!tb[NETCONFA_IFINDEX]) 655 return -EINVAL; 656 657 err = -EINVAL; 658 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 659 switch (ifindex) { 660 case NETCONFA_IFINDEX_ALL: 661 devconf = net->ipv6.devconf_all; 662 break; 663 case NETCONFA_IFINDEX_DEFAULT: 664 devconf = net->ipv6.devconf_dflt; 665 break; 666 default: 667 dev = dev_get_by_index(net, ifindex); 668 if (!dev) 669 return -EINVAL; 670 in6_dev = in6_dev_get(dev); 671 if (!in6_dev) 672 goto errout; 673 devconf = &in6_dev->cnf; 674 break; 675 } 676 677 err = -ENOBUFS; 678 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); 679 if (!skb) 680 goto errout; 681 682 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 683 NETLINK_CB(in_skb).portid, 684 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 685 NETCONFA_ALL); 686 if (err < 0) { 687 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 688 WARN_ON(err == -EMSGSIZE); 689 kfree_skb(skb); 690 goto errout; 691 } 692 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 693errout: 694 if (in6_dev) 695 in6_dev_put(in6_dev); 696 if (dev) 697 dev_put(dev); 698 return err; 699} 700 701static int inet6_netconf_dump_devconf(struct sk_buff *skb, 702 struct netlink_callback *cb) 703{ 704 const struct nlmsghdr *nlh = cb->nlh; 705 struct net *net = sock_net(skb->sk); 706 int h, s_h; 707 int idx, s_idx; 708 struct net_device *dev; 709 struct inet6_dev *idev; 710 struct hlist_head *head; 711 712 if (cb->strict_check) { 713 struct netlink_ext_ack *extack = cb->extack; 714 struct netconfmsg *ncm; 715 716 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) { 717 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request"); 718 return -EINVAL; 719 } 720 721 if (nlmsg_attrlen(nlh, sizeof(*ncm))) { 722 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request"); 723 return -EINVAL; 724 } 725 } 726 727 s_h = cb->args[0]; 728 s_idx = idx = cb->args[1]; 729 730 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 731 idx = 0; 732 head = &net->dev_index_head[h]; 733 rcu_read_lock(); 734 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 735 net->dev_base_seq; 736 hlist_for_each_entry_rcu(dev, head, index_hlist) { 737 if (idx < s_idx) 738 goto cont; 739 idev = __in6_dev_get(dev); 740 if (!idev) 741 goto cont; 742 743 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 744 &idev->cnf, 745 NETLINK_CB(cb->skb).portid, 746 nlh->nlmsg_seq, 747 RTM_NEWNETCONF, 748 NLM_F_MULTI, 749 NETCONFA_ALL) < 0) { 750 rcu_read_unlock(); 751 goto done; 752 } 753 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 754cont: 755 idx++; 756 } 757 rcu_read_unlock(); 758 } 759 if (h == NETDEV_HASHENTRIES) { 760 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 761 net->ipv6.devconf_all, 762 NETLINK_CB(cb->skb).portid, 763 nlh->nlmsg_seq, 764 RTM_NEWNETCONF, NLM_F_MULTI, 765 NETCONFA_ALL) < 0) 766 goto done; 767 else 768 h++; 769 } 770 if (h == NETDEV_HASHENTRIES + 1) { 771 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 772 net->ipv6.devconf_dflt, 773 NETLINK_CB(cb->skb).portid, 774 nlh->nlmsg_seq, 775 RTM_NEWNETCONF, NLM_F_MULTI, 776 NETCONFA_ALL) < 0) 777 goto done; 778 else 779 h++; 780 } 781done: 782 cb->args[0] = h; 783 cb->args[1] = idx; 784 785 return skb->len; 786} 787 788#ifdef CONFIG_SYSCTL 789static void dev_forward_change(struct inet6_dev *idev) 790{ 791 struct net_device *dev; 792 struct inet6_ifaddr *ifa; 793 LIST_HEAD(tmp_addr_list); 794 795 if (!idev) 796 return; 797 dev = idev->dev; 798 if (idev->cnf.forwarding) 799 dev_disable_lro(dev); 800 if (dev->flags & IFF_MULTICAST) { 801 if (idev->cnf.forwarding) { 802 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 803 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 804 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 805 } else { 806 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 807 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 808 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 809 } 810 } 811 812 read_lock_bh(&idev->lock); 813 list_for_each_entry(ifa, &idev->addr_list, if_list) { 814 if (ifa->flags&IFA_F_TENTATIVE) 815 continue; 816 list_add_tail(&ifa->if_list_aux, &tmp_addr_list); 817 } 818 read_unlock_bh(&idev->lock); 819 820 while (!list_empty(&tmp_addr_list)) { 821 ifa = list_first_entry(&tmp_addr_list, 822 struct inet6_ifaddr, if_list_aux); 823 list_del(&ifa->if_list_aux); 824 if (idev->cnf.forwarding) 825 addrconf_join_anycast(ifa); 826 else 827 addrconf_leave_anycast(ifa); 828 } 829 830 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, 831 NETCONFA_FORWARDING, 832 dev->ifindex, &idev->cnf); 833} 834 835 836static void addrconf_forward_change(struct net *net, __s32 newf) 837{ 838 struct net_device *dev; 839 struct inet6_dev *idev; 840 841 for_each_netdev(net, dev) { 842 idev = __in6_dev_get(dev); 843 if (idev) { 844 int changed = (!idev->cnf.forwarding) ^ (!newf); 845 idev->cnf.forwarding = newf; 846 if (changed) 847 dev_forward_change(idev); 848 } 849 } 850} 851 852static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 853{ 854 struct net *net; 855 int old; 856 857 if (!rtnl_trylock()) 858 return restart_syscall(); 859 860 net = (struct net *)table->extra2; 861 old = *p; 862 *p = newf; 863 864 if (p == &net->ipv6.devconf_dflt->forwarding) { 865 if ((!newf) ^ (!old)) 866 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 867 NETCONFA_FORWARDING, 868 NETCONFA_IFINDEX_DEFAULT, 869 net->ipv6.devconf_dflt); 870 rtnl_unlock(); 871 return 0; 872 } 873 874 if (p == &net->ipv6.devconf_all->forwarding) { 875 int old_dflt = net->ipv6.devconf_dflt->forwarding; 876 877 net->ipv6.devconf_dflt->forwarding = newf; 878 if ((!newf) ^ (!old_dflt)) 879 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 880 NETCONFA_FORWARDING, 881 NETCONFA_IFINDEX_DEFAULT, 882 net->ipv6.devconf_dflt); 883 884 addrconf_forward_change(net, newf); 885 if ((!newf) ^ (!old)) 886 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 887 NETCONFA_FORWARDING, 888 NETCONFA_IFINDEX_ALL, 889 net->ipv6.devconf_all); 890 } else if ((!newf) ^ (!old)) 891 dev_forward_change((struct inet6_dev *)table->extra1); 892 rtnl_unlock(); 893 894 if (newf) 895 rt6_purge_dflt_routers(net); 896 return 1; 897} 898 899static void addrconf_linkdown_change(struct net *net, __s32 newf) 900{ 901 struct net_device *dev; 902 struct inet6_dev *idev; 903 904 for_each_netdev(net, dev) { 905 idev = __in6_dev_get(dev); 906 if (idev) { 907 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 908 909 idev->cnf.ignore_routes_with_linkdown = newf; 910 if (changed) 911 inet6_netconf_notify_devconf(dev_net(dev), 912 RTM_NEWNETCONF, 913 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 914 dev->ifindex, 915 &idev->cnf); 916 } 917 } 918} 919 920static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 921{ 922 struct net *net; 923 int old; 924 925 if (!rtnl_trylock()) 926 return restart_syscall(); 927 928 net = (struct net *)table->extra2; 929 old = *p; 930 *p = newf; 931 932 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 933 if ((!newf) ^ (!old)) 934 inet6_netconf_notify_devconf(net, 935 RTM_NEWNETCONF, 936 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 937 NETCONFA_IFINDEX_DEFAULT, 938 net->ipv6.devconf_dflt); 939 rtnl_unlock(); 940 return 0; 941 } 942 943 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 944 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 945 addrconf_linkdown_change(net, newf); 946 if ((!newf) ^ (!old)) 947 inet6_netconf_notify_devconf(net, 948 RTM_NEWNETCONF, 949 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 950 NETCONFA_IFINDEX_ALL, 951 net->ipv6.devconf_all); 952 } 953 rtnl_unlock(); 954 955 return 1; 956} 957 958#endif 959 960/* Nobody refers to this ifaddr, destroy it */ 961void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 962{ 963 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 964 965#ifdef NET_REFCNT_DEBUG 966 pr_debug("%s\n", __func__); 967#endif 968 969 in6_dev_put(ifp->idev); 970 971 if (cancel_delayed_work(&ifp->dad_work)) 972 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 973 ifp); 974 975 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 976 pr_warn("Freeing alive inet6 address %p\n", ifp); 977 return; 978 } 979 980 kfree_rcu(ifp, rcu); 981} 982 983static void 984ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 985{ 986 struct list_head *p; 987 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 988 989 /* 990 * Each device address list is sorted in order of scope - 991 * global before linklocal. 992 */ 993 list_for_each(p, &idev->addr_list) { 994 struct inet6_ifaddr *ifa 995 = list_entry(p, struct inet6_ifaddr, if_list); 996 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 997 break; 998 } 999 1000 list_add_tail_rcu(&ifp->if_list, p); 1001} 1002 1003static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr) 1004{ 1005 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net); 1006 1007 return hash_32(val, IN6_ADDR_HSIZE_SHIFT); 1008} 1009 1010static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1011 struct net_device *dev, unsigned int hash) 1012{ 1013 struct inet6_ifaddr *ifp; 1014 1015 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1016 if (!net_eq(dev_net(ifp->idev->dev), net)) 1017 continue; 1018 if (ipv6_addr_equal(&ifp->addr, addr)) { 1019 if (!dev || ifp->idev->dev == dev) 1020 return true; 1021 } 1022 } 1023 return false; 1024} 1025 1026static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa) 1027{ 1028 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr); 1029 int err = 0; 1030 1031 spin_lock(&addrconf_hash_lock); 1032 1033 /* Ignore adding duplicate addresses on an interface */ 1034 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) { 1035 netdev_dbg(dev, "ipv6_add_addr: already assigned\n"); 1036 err = -EEXIST; 1037 } else { 1038 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 1039 } 1040 1041 spin_unlock(&addrconf_hash_lock); 1042 1043 return err; 1044} 1045 1046/* On success it returns ifp with increased reference count */ 1047 1048static struct inet6_ifaddr * 1049ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg, 1050 bool can_block, struct netlink_ext_ack *extack) 1051{ 1052 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC; 1053 int addr_type = ipv6_addr_type(cfg->pfx); 1054 struct net *net = dev_net(idev->dev); 1055 struct inet6_ifaddr *ifa = NULL; 1056 struct fib6_info *f6i = NULL; 1057 int err = 0; 1058 1059 if (addr_type == IPV6_ADDR_ANY || 1060 (addr_type & IPV6_ADDR_MULTICAST && 1061 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) || 1062 (!(idev->dev->flags & IFF_LOOPBACK) && 1063 !netif_is_l3_master(idev->dev) && 1064 addr_type & IPV6_ADDR_LOOPBACK)) 1065 return ERR_PTR(-EADDRNOTAVAIL); 1066 1067 if (idev->dead) { 1068 err = -ENODEV; /*XXX*/ 1069 goto out; 1070 } 1071 1072 if (idev->cnf.disable_ipv6) { 1073 err = -EACCES; 1074 goto out; 1075 } 1076 1077 /* validator notifier needs to be blocking; 1078 * do not call in atomic context 1079 */ 1080 if (can_block) { 1081 struct in6_validator_info i6vi = { 1082 .i6vi_addr = *cfg->pfx, 1083 .i6vi_dev = idev, 1084 .extack = extack, 1085 }; 1086 1087 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi); 1088 err = notifier_to_errno(err); 1089 if (err < 0) 1090 goto out; 1091 } 1092 1093 ifa = kzalloc(sizeof(*ifa), gfp_flags); 1094 if (!ifa) { 1095 err = -ENOBUFS; 1096 goto out; 1097 } 1098 1099 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags); 1100 if (IS_ERR(f6i)) { 1101 err = PTR_ERR(f6i); 1102 f6i = NULL; 1103 goto out; 1104 } 1105 1106 neigh_parms_data_state_setall(idev->nd_parms); 1107 1108 ifa->addr = *cfg->pfx; 1109 if (cfg->peer_pfx) 1110 ifa->peer_addr = *cfg->peer_pfx; 1111 1112 spin_lock_init(&ifa->lock); 1113 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1114 INIT_HLIST_NODE(&ifa->addr_lst); 1115 ifa->scope = cfg->scope; 1116 ifa->prefix_len = cfg->plen; 1117 ifa->rt_priority = cfg->rt_priority; 1118 ifa->flags = cfg->ifa_flags; 1119 /* No need to add the TENTATIVE flag for addresses with NODAD */ 1120 if (!(cfg->ifa_flags & IFA_F_NODAD)) 1121 ifa->flags |= IFA_F_TENTATIVE; 1122 ifa->valid_lft = cfg->valid_lft; 1123 ifa->prefered_lft = cfg->preferred_lft; 1124 ifa->cstamp = ifa->tstamp = jiffies; 1125 ifa->tokenized = false; 1126 1127 ifa->rt = f6i; 1128 1129 ifa->idev = idev; 1130 in6_dev_hold(idev); 1131 1132 /* For caller */ 1133 refcount_set(&ifa->refcnt, 1); 1134 1135 rcu_read_lock_bh(); 1136 1137 err = ipv6_add_addr_hash(idev->dev, ifa); 1138 if (err < 0) { 1139 rcu_read_unlock_bh(); 1140 goto out; 1141 } 1142 1143 write_lock(&idev->lock); 1144 1145 /* Add to inet6_dev unicast addr list. */ 1146 ipv6_link_dev_addr(idev, ifa); 1147 1148 if (ifa->flags&IFA_F_TEMPORARY) { 1149 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1150 in6_ifa_hold(ifa); 1151 } 1152 1153 in6_ifa_hold(ifa); 1154 write_unlock(&idev->lock); 1155 1156 rcu_read_unlock_bh(); 1157 1158 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1159out: 1160 if (unlikely(err < 0)) { 1161 fib6_info_release(f6i); 1162 1163 if (ifa) { 1164 if (ifa->idev) 1165 in6_dev_put(ifa->idev); 1166 kfree(ifa); 1167 } 1168 ifa = ERR_PTR(err); 1169 } 1170 1171 return ifa; 1172} 1173 1174enum cleanup_prefix_rt_t { 1175 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1176 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1177 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1178}; 1179 1180/* 1181 * Check, whether the prefix for ifp would still need a prefix route 1182 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1183 * constants. 1184 * 1185 * 1) we don't purge prefix if address was not permanent. 1186 * prefix is managed by its own lifetime. 1187 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1188 * 3) if there are no addresses, delete prefix. 1189 * 4) if there are still other permanent address(es), 1190 * corresponding prefix is still permanent. 1191 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1192 * don't purge the prefix, assume user space is managing it. 1193 * 6) otherwise, update prefix lifetime to the 1194 * longest valid lifetime among the corresponding 1195 * addresses on the device. 1196 * Note: subsequent RA will update lifetime. 1197 **/ 1198static enum cleanup_prefix_rt_t 1199check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1200{ 1201 struct inet6_ifaddr *ifa; 1202 struct inet6_dev *idev = ifp->idev; 1203 unsigned long lifetime; 1204 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1205 1206 *expires = jiffies; 1207 1208 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1209 if (ifa == ifp) 1210 continue; 1211 if (ifa->prefix_len != ifp->prefix_len || 1212 !ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1213 ifp->prefix_len)) 1214 continue; 1215 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1216 return CLEANUP_PREFIX_RT_NOP; 1217 1218 action = CLEANUP_PREFIX_RT_EXPIRE; 1219 1220 spin_lock(&ifa->lock); 1221 1222 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1223 /* 1224 * Note: Because this address is 1225 * not permanent, lifetime < 1226 * LONG_MAX / HZ here. 1227 */ 1228 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1229 *expires = ifa->tstamp + lifetime * HZ; 1230 spin_unlock(&ifa->lock); 1231 } 1232 1233 return action; 1234} 1235 1236static void 1237cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, 1238 bool del_rt, bool del_peer) 1239{ 1240 struct fib6_info *f6i; 1241 1242 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr, 1243 ifp->prefix_len, 1244 ifp->idev->dev, 0, RTF_DEFAULT, true); 1245 if (f6i) { 1246 if (del_rt) 1247 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 1248 else { 1249 if (!(f6i->fib6_flags & RTF_EXPIRES)) 1250 fib6_set_expires(f6i, expires); 1251 fib6_info_release(f6i); 1252 } 1253 } 1254} 1255 1256 1257/* This function wants to get referenced ifp and releases it before return */ 1258 1259static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1260{ 1261 int state; 1262 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1263 unsigned long expires; 1264 1265 ASSERT_RTNL(); 1266 1267 spin_lock_bh(&ifp->lock); 1268 state = ifp->state; 1269 ifp->state = INET6_IFADDR_STATE_DEAD; 1270 spin_unlock_bh(&ifp->lock); 1271 1272 if (state == INET6_IFADDR_STATE_DEAD) 1273 goto out; 1274 1275 spin_lock_bh(&addrconf_hash_lock); 1276 hlist_del_init_rcu(&ifp->addr_lst); 1277 spin_unlock_bh(&addrconf_hash_lock); 1278 1279 write_lock_bh(&ifp->idev->lock); 1280 1281 if (ifp->flags&IFA_F_TEMPORARY) { 1282 list_del(&ifp->tmp_list); 1283 if (ifp->ifpub) { 1284 in6_ifa_put(ifp->ifpub); 1285 ifp->ifpub = NULL; 1286 } 1287 __in6_ifa_put(ifp); 1288 } 1289 1290 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1291 action = check_cleanup_prefix_route(ifp, &expires); 1292 1293 list_del_rcu(&ifp->if_list); 1294 __in6_ifa_put(ifp); 1295 1296 write_unlock_bh(&ifp->idev->lock); 1297 1298 addrconf_del_dad_work(ifp); 1299 1300 ipv6_ifa_notify(RTM_DELADDR, ifp); 1301 1302 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1303 1304 if (action != CLEANUP_PREFIX_RT_NOP) { 1305 cleanup_prefix_route(ifp, expires, 1306 action == CLEANUP_PREFIX_RT_DEL, false); 1307 } 1308 1309 /* clean up prefsrc entries */ 1310 rt6_remove_prefsrc(ifp); 1311out: 1312 in6_ifa_put(ifp); 1313} 1314 1315static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block) 1316{ 1317 struct inet6_dev *idev = ifp->idev; 1318 unsigned long tmp_tstamp, age; 1319 unsigned long regen_advance; 1320 unsigned long now = jiffies; 1321 s32 cnf_temp_preferred_lft; 1322 struct inet6_ifaddr *ift; 1323 struct ifa6_config cfg; 1324 long max_desync_factor; 1325 struct in6_addr addr; 1326 int ret = 0; 1327 1328 write_lock_bh(&idev->lock); 1329 1330retry: 1331 in6_dev_hold(idev); 1332 if (idev->cnf.use_tempaddr <= 0) { 1333 write_unlock_bh(&idev->lock); 1334 pr_info("%s: use_tempaddr is disabled\n", __func__); 1335 in6_dev_put(idev); 1336 ret = -1; 1337 goto out; 1338 } 1339 spin_lock_bh(&ifp->lock); 1340 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1341 idev->cnf.use_tempaddr = -1; /*XXX*/ 1342 spin_unlock_bh(&ifp->lock); 1343 write_unlock_bh(&idev->lock); 1344 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1345 __func__); 1346 in6_dev_put(idev); 1347 ret = -1; 1348 goto out; 1349 } 1350 in6_ifa_hold(ifp); 1351 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1352 ipv6_gen_rnd_iid(&addr); 1353 1354 age = (now - ifp->tstamp) / HZ; 1355 1356 regen_advance = idev->cnf.regen_max_retry * 1357 idev->cnf.dad_transmits * 1358 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 1359 1360 /* recalculate max_desync_factor each time and update 1361 * idev->desync_factor if it's larger 1362 */ 1363 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1364 max_desync_factor = min_t(long, 1365 idev->cnf.max_desync_factor, 1366 cnf_temp_preferred_lft - regen_advance); 1367 1368 if (unlikely(idev->desync_factor > max_desync_factor)) { 1369 if (max_desync_factor > 0) { 1370 get_random_bytes(&idev->desync_factor, 1371 sizeof(idev->desync_factor)); 1372 idev->desync_factor %= max_desync_factor; 1373 } else { 1374 idev->desync_factor = 0; 1375 } 1376 } 1377 1378 memset(&cfg, 0, sizeof(cfg)); 1379 cfg.valid_lft = min_t(__u32, ifp->valid_lft, 1380 idev->cnf.temp_valid_lft + age); 1381 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor; 1382 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft); 1383 1384 cfg.plen = ifp->prefix_len; 1385 tmp_tstamp = ifp->tstamp; 1386 spin_unlock_bh(&ifp->lock); 1387 1388 write_unlock_bh(&idev->lock); 1389 1390 /* A temporary address is created only if this calculated Preferred 1391 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1392 * an implementation must not create a temporary address with a zero 1393 * Preferred Lifetime. 1394 * Use age calculation as in addrconf_verify to avoid unnecessary 1395 * temporary addresses being generated. 1396 */ 1397 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1398 if (cfg.preferred_lft <= regen_advance + age) { 1399 in6_ifa_put(ifp); 1400 in6_dev_put(idev); 1401 ret = -1; 1402 goto out; 1403 } 1404 1405 cfg.ifa_flags = IFA_F_TEMPORARY; 1406 /* set in addrconf_prefix_rcv() */ 1407 if (ifp->flags & IFA_F_OPTIMISTIC) 1408 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 1409 1410 cfg.pfx = &addr; 1411 cfg.scope = ipv6_addr_scope(cfg.pfx); 1412 1413 ift = ipv6_add_addr(idev, &cfg, block, NULL); 1414 if (IS_ERR(ift)) { 1415 in6_ifa_put(ifp); 1416 in6_dev_put(idev); 1417 pr_info("%s: retry temporary address regeneration\n", __func__); 1418 write_lock_bh(&idev->lock); 1419 goto retry; 1420 } 1421 1422 spin_lock_bh(&ift->lock); 1423 ift->ifpub = ifp; 1424 ift->cstamp = now; 1425 ift->tstamp = tmp_tstamp; 1426 spin_unlock_bh(&ift->lock); 1427 1428 addrconf_dad_start(ift); 1429 in6_ifa_put(ift); 1430 in6_dev_put(idev); 1431out: 1432 return ret; 1433} 1434 1435/* 1436 * Choose an appropriate source address (RFC3484) 1437 */ 1438enum { 1439 IPV6_SADDR_RULE_INIT = 0, 1440 IPV6_SADDR_RULE_LOCAL, 1441 IPV6_SADDR_RULE_SCOPE, 1442 IPV6_SADDR_RULE_PREFERRED, 1443#ifdef CONFIG_IPV6_MIP6 1444 IPV6_SADDR_RULE_HOA, 1445#endif 1446 IPV6_SADDR_RULE_OIF, 1447 IPV6_SADDR_RULE_LABEL, 1448 IPV6_SADDR_RULE_PRIVACY, 1449 IPV6_SADDR_RULE_ORCHID, 1450 IPV6_SADDR_RULE_PREFIX, 1451#ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1452 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1453#endif 1454 IPV6_SADDR_RULE_MAX 1455}; 1456 1457struct ipv6_saddr_score { 1458 int rule; 1459 int addr_type; 1460 struct inet6_ifaddr *ifa; 1461 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1462 int scopedist; 1463 int matchlen; 1464}; 1465 1466struct ipv6_saddr_dst { 1467 const struct in6_addr *addr; 1468 int ifindex; 1469 int scope; 1470 int label; 1471 unsigned int prefs; 1472}; 1473 1474static inline int ipv6_saddr_preferred(int type) 1475{ 1476 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1477 return 1; 1478 return 0; 1479} 1480 1481static bool ipv6_use_optimistic_addr(struct net *net, 1482 struct inet6_dev *idev) 1483{ 1484#ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1485 if (!idev) 1486 return false; 1487 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1488 return false; 1489 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic) 1490 return false; 1491 1492 return true; 1493#else 1494 return false; 1495#endif 1496} 1497 1498static bool ipv6_allow_optimistic_dad(struct net *net, 1499 struct inet6_dev *idev) 1500{ 1501#ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1502 if (!idev) 1503 return false; 1504 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1505 return false; 1506 1507 return true; 1508#else 1509 return false; 1510#endif 1511} 1512 1513static int ipv6_get_saddr_eval(struct net *net, 1514 struct ipv6_saddr_score *score, 1515 struct ipv6_saddr_dst *dst, 1516 int i) 1517{ 1518 int ret; 1519 1520 if (i <= score->rule) { 1521 switch (i) { 1522 case IPV6_SADDR_RULE_SCOPE: 1523 ret = score->scopedist; 1524 break; 1525 case IPV6_SADDR_RULE_PREFIX: 1526 ret = score->matchlen; 1527 break; 1528 default: 1529 ret = !!test_bit(i, score->scorebits); 1530 } 1531 goto out; 1532 } 1533 1534 switch (i) { 1535 case IPV6_SADDR_RULE_INIT: 1536 /* Rule 0: remember if hiscore is not ready yet */ 1537 ret = !!score->ifa; 1538 break; 1539 case IPV6_SADDR_RULE_LOCAL: 1540 /* Rule 1: Prefer same address */ 1541 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1542 break; 1543 case IPV6_SADDR_RULE_SCOPE: 1544 /* Rule 2: Prefer appropriate scope 1545 * 1546 * ret 1547 * ^ 1548 * -1 | d 15 1549 * ---+--+-+---> scope 1550 * | 1551 * | d is scope of the destination. 1552 * B-d | \ 1553 * | \ <- smaller scope is better if 1554 * B-15 | \ if scope is enough for destination. 1555 * | ret = B - scope (-1 <= scope >= d <= 15). 1556 * d-C-1 | / 1557 * |/ <- greater is better 1558 * -C / if scope is not enough for destination. 1559 * /| ret = scope - C (-1 <= d < scope <= 15). 1560 * 1561 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1562 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1563 * Assume B = 0 and we get C > 29. 1564 */ 1565 ret = __ipv6_addr_src_scope(score->addr_type); 1566 if (ret >= dst->scope) 1567 ret = -ret; 1568 else 1569 ret -= 128; /* 30 is enough */ 1570 score->scopedist = ret; 1571 break; 1572 case IPV6_SADDR_RULE_PREFERRED: 1573 { 1574 /* Rule 3: Avoid deprecated and optimistic addresses */ 1575 u8 avoid = IFA_F_DEPRECATED; 1576 1577 if (!ipv6_use_optimistic_addr(net, score->ifa->idev)) 1578 avoid |= IFA_F_OPTIMISTIC; 1579 ret = ipv6_saddr_preferred(score->addr_type) || 1580 !(score->ifa->flags & avoid); 1581 break; 1582 } 1583#ifdef CONFIG_IPV6_MIP6 1584 case IPV6_SADDR_RULE_HOA: 1585 { 1586 /* Rule 4: Prefer home address */ 1587 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1588 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1589 break; 1590 } 1591#endif 1592 case IPV6_SADDR_RULE_OIF: 1593 /* Rule 5: Prefer outgoing interface */ 1594 ret = (!dst->ifindex || 1595 dst->ifindex == score->ifa->idev->dev->ifindex); 1596 break; 1597 case IPV6_SADDR_RULE_LABEL: 1598 /* Rule 6: Prefer matching label */ 1599 ret = ipv6_addr_label(net, 1600 &score->ifa->addr, score->addr_type, 1601 score->ifa->idev->dev->ifindex) == dst->label; 1602 break; 1603 case IPV6_SADDR_RULE_PRIVACY: 1604 { 1605 /* Rule 7: Prefer public address 1606 * Note: prefer temporary address if use_tempaddr >= 2 1607 */ 1608 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1609 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1610 score->ifa->idev->cnf.use_tempaddr >= 2; 1611 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1612 break; 1613 } 1614 case IPV6_SADDR_RULE_ORCHID: 1615 /* Rule 8-: Prefer ORCHID vs ORCHID or 1616 * non-ORCHID vs non-ORCHID 1617 */ 1618 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1619 ipv6_addr_orchid(dst->addr)); 1620 break; 1621 case IPV6_SADDR_RULE_PREFIX: 1622 /* Rule 8: Use longest matching prefix */ 1623 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1624 if (ret > score->ifa->prefix_len) 1625 ret = score->ifa->prefix_len; 1626 score->matchlen = ret; 1627 break; 1628#ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1629 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1630 /* Optimistic addresses still have lower precedence than other 1631 * preferred addresses. 1632 */ 1633 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1634 break; 1635#endif 1636 default: 1637 ret = 0; 1638 } 1639 1640 if (ret) 1641 __set_bit(i, score->scorebits); 1642 score->rule = i; 1643out: 1644 return ret; 1645} 1646 1647static int __ipv6_dev_get_saddr(struct net *net, 1648 struct ipv6_saddr_dst *dst, 1649 struct inet6_dev *idev, 1650 struct ipv6_saddr_score *scores, 1651 int hiscore_idx) 1652{ 1653 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1654 1655 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) { 1656 int i; 1657 1658 /* 1659 * - Tentative Address (RFC2462 section 5.4) 1660 * - A tentative address is not considered 1661 * "assigned to an interface" in the traditional 1662 * sense, unless it is also flagged as optimistic. 1663 * - Candidate Source Address (section 4) 1664 * - In any case, anycast addresses, multicast 1665 * addresses, and the unspecified address MUST 1666 * NOT be included in a candidate set. 1667 */ 1668 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1669 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1670 continue; 1671 1672 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1673 1674 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1675 score->addr_type & IPV6_ADDR_MULTICAST)) { 1676 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1677 idev->dev->name); 1678 continue; 1679 } 1680 1681 score->rule = -1; 1682 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1683 1684 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1685 int minihiscore, miniscore; 1686 1687 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1688 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1689 1690 if (minihiscore > miniscore) { 1691 if (i == IPV6_SADDR_RULE_SCOPE && 1692 score->scopedist > 0) { 1693 /* 1694 * special case: 1695 * each remaining entry 1696 * has too small (not enough) 1697 * scope, because ifa entries 1698 * are sorted by their scope 1699 * values. 1700 */ 1701 goto out; 1702 } 1703 break; 1704 } else if (minihiscore < miniscore) { 1705 swap(hiscore, score); 1706 hiscore_idx = 1 - hiscore_idx; 1707 1708 /* restore our iterator */ 1709 score->ifa = hiscore->ifa; 1710 1711 break; 1712 } 1713 } 1714 } 1715out: 1716 return hiscore_idx; 1717} 1718 1719static int ipv6_get_saddr_master(struct net *net, 1720 const struct net_device *dst_dev, 1721 const struct net_device *master, 1722 struct ipv6_saddr_dst *dst, 1723 struct ipv6_saddr_score *scores, 1724 int hiscore_idx) 1725{ 1726 struct inet6_dev *idev; 1727 1728 idev = __in6_dev_get(dst_dev); 1729 if (idev) 1730 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1731 scores, hiscore_idx); 1732 1733 idev = __in6_dev_get(master); 1734 if (idev) 1735 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1736 scores, hiscore_idx); 1737 1738 return hiscore_idx; 1739} 1740 1741int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1742 const struct in6_addr *daddr, unsigned int prefs, 1743 struct in6_addr *saddr) 1744{ 1745 struct ipv6_saddr_score scores[2], *hiscore; 1746 struct ipv6_saddr_dst dst; 1747 struct inet6_dev *idev; 1748 struct net_device *dev; 1749 int dst_type; 1750 bool use_oif_addr = false; 1751 int hiscore_idx = 0; 1752 int ret = 0; 1753 1754 dst_type = __ipv6_addr_type(daddr); 1755 dst.addr = daddr; 1756 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1757 dst.scope = __ipv6_addr_src_scope(dst_type); 1758 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1759 dst.prefs = prefs; 1760 1761 scores[hiscore_idx].rule = -1; 1762 scores[hiscore_idx].ifa = NULL; 1763 1764 rcu_read_lock(); 1765 1766 /* Candidate Source Address (section 4) 1767 * - multicast and link-local destination address, 1768 * the set of candidate source address MUST only 1769 * include addresses assigned to interfaces 1770 * belonging to the same link as the outgoing 1771 * interface. 1772 * (- For site-local destination addresses, the 1773 * set of candidate source addresses MUST only 1774 * include addresses assigned to interfaces 1775 * belonging to the same site as the outgoing 1776 * interface.) 1777 * - "It is RECOMMENDED that the candidate source addresses 1778 * be the set of unicast addresses assigned to the 1779 * interface that will be used to send to the destination 1780 * (the 'outgoing' interface)." (RFC 6724) 1781 */ 1782 if (dst_dev) { 1783 idev = __in6_dev_get(dst_dev); 1784 if ((dst_type & IPV6_ADDR_MULTICAST) || 1785 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1786 (idev && idev->cnf.use_oif_addrs_only)) { 1787 use_oif_addr = true; 1788 } 1789 } 1790 1791 if (use_oif_addr) { 1792 if (idev) 1793 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1794 } else { 1795 const struct net_device *master; 1796 int master_idx = 0; 1797 1798 /* if dst_dev exists and is enslaved to an L3 device, then 1799 * prefer addresses from dst_dev and then the master over 1800 * any other enslaved devices in the L3 domain. 1801 */ 1802 master = l3mdev_master_dev_rcu(dst_dev); 1803 if (master) { 1804 master_idx = master->ifindex; 1805 1806 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1807 master, &dst, 1808 scores, hiscore_idx); 1809 1810 if (scores[hiscore_idx].ifa) 1811 goto out; 1812 } 1813 1814 for_each_netdev_rcu(net, dev) { 1815 /* only consider addresses on devices in the 1816 * same L3 domain 1817 */ 1818 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1819 continue; 1820 idev = __in6_dev_get(dev); 1821 if (!idev) 1822 continue; 1823 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1824 } 1825 } 1826 1827out: 1828 hiscore = &scores[hiscore_idx]; 1829 if (!hiscore->ifa) 1830 ret = -EADDRNOTAVAIL; 1831 else 1832 *saddr = hiscore->ifa->addr; 1833 1834 rcu_read_unlock(); 1835 return ret; 1836} 1837EXPORT_SYMBOL(ipv6_dev_get_saddr); 1838 1839int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1840 u32 banned_flags) 1841{ 1842 struct inet6_ifaddr *ifp; 1843 int err = -EADDRNOTAVAIL; 1844 1845 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1846 if (ifp->scope > IFA_LINK) 1847 break; 1848 if (ifp->scope == IFA_LINK && 1849 !(ifp->flags & banned_flags)) { 1850 *addr = ifp->addr; 1851 err = 0; 1852 break; 1853 } 1854 } 1855 return err; 1856} 1857 1858int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1859 u32 banned_flags) 1860{ 1861 struct inet6_dev *idev; 1862 int err = -EADDRNOTAVAIL; 1863 1864 rcu_read_lock(); 1865 idev = __in6_dev_get(dev); 1866 if (idev) { 1867 read_lock_bh(&idev->lock); 1868 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1869 read_unlock_bh(&idev->lock); 1870 } 1871 rcu_read_unlock(); 1872 return err; 1873} 1874 1875static int ipv6_count_addresses(const struct inet6_dev *idev) 1876{ 1877 const struct inet6_ifaddr *ifp; 1878 int cnt = 0; 1879 1880 rcu_read_lock(); 1881 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list) 1882 cnt++; 1883 rcu_read_unlock(); 1884 return cnt; 1885} 1886 1887int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1888 const struct net_device *dev, int strict) 1889{ 1890 return ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1891 strict, IFA_F_TENTATIVE); 1892} 1893EXPORT_SYMBOL(ipv6_chk_addr); 1894 1895/* device argument is used to find the L3 domain of interest. If 1896 * skip_dev_check is set, then the ifp device is not checked against 1897 * the passed in dev argument. So the 2 cases for addresses checks are: 1898 * 1. does the address exist in the L3 domain that dev is part of 1899 * (skip_dev_check = true), or 1900 * 1901 * 2. does the address exist on the specific device 1902 * (skip_dev_check = false) 1903 */ 1904static struct net_device * 1905__ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1906 const struct net_device *dev, bool skip_dev_check, 1907 int strict, u32 banned_flags) 1908{ 1909 unsigned int hash = inet6_addr_hash(net, addr); 1910 struct net_device *l3mdev, *ndev; 1911 struct inet6_ifaddr *ifp; 1912 u32 ifp_flags; 1913 1914 rcu_read_lock(); 1915 1916 l3mdev = l3mdev_master_dev_rcu(dev); 1917 if (skip_dev_check) 1918 dev = NULL; 1919 1920 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1921 ndev = ifp->idev->dev; 1922 if (!net_eq(dev_net(ndev), net)) 1923 continue; 1924 1925 if (l3mdev_master_dev_rcu(ndev) != l3mdev) 1926 continue; 1927 1928 /* Decouple optimistic from tentative for evaluation here. 1929 * Ban optimistic addresses explicitly, when required. 1930 */ 1931 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1932 ? (ifp->flags&~IFA_F_TENTATIVE) 1933 : ifp->flags; 1934 if (ipv6_addr_equal(&ifp->addr, addr) && 1935 !(ifp_flags&banned_flags) && 1936 (!dev || ndev == dev || 1937 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1938 rcu_read_unlock(); 1939 return ndev; 1940 } 1941 } 1942 1943 rcu_read_unlock(); 1944 return NULL; 1945} 1946 1947int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1948 const struct net_device *dev, bool skip_dev_check, 1949 int strict, u32 banned_flags) 1950{ 1951 return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check, 1952 strict, banned_flags) ? 1 : 0; 1953} 1954EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1955 1956 1957/* Compares an address/prefix_len with addresses on device @dev. 1958 * If one is found it returns true. 1959 */ 1960bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1961 const unsigned int prefix_len, struct net_device *dev) 1962{ 1963 const struct inet6_ifaddr *ifa; 1964 const struct inet6_dev *idev; 1965 bool ret = false; 1966 1967 rcu_read_lock(); 1968 idev = __in6_dev_get(dev); 1969 if (idev) { 1970 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1971 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1972 if (ret) 1973 break; 1974 } 1975 } 1976 rcu_read_unlock(); 1977 1978 return ret; 1979} 1980EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1981 1982int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1983{ 1984 const struct inet6_ifaddr *ifa; 1985 const struct inet6_dev *idev; 1986 int onlink; 1987 1988 onlink = 0; 1989 rcu_read_lock(); 1990 idev = __in6_dev_get(dev); 1991 if (idev) { 1992 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1993 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1994 ifa->prefix_len); 1995 if (onlink) 1996 break; 1997 } 1998 } 1999 rcu_read_unlock(); 2000 return onlink; 2001} 2002EXPORT_SYMBOL(ipv6_chk_prefix); 2003 2004/** 2005 * ipv6_dev_find - find the first device with a given source address. 2006 * @net: the net namespace 2007 * @addr: the source address 2008 * 2009 * The caller should be protected by RCU, or RTNL. 2010 */ 2011struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr, 2012 struct net_device *dev) 2013{ 2014 return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1, 2015 IFA_F_TENTATIVE); 2016} 2017EXPORT_SYMBOL(ipv6_dev_find); 2018 2019struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 2020 struct net_device *dev, int strict) 2021{ 2022 unsigned int hash = inet6_addr_hash(net, addr); 2023 struct inet6_ifaddr *ifp, *result = NULL; 2024 2025 rcu_read_lock(); 2026 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 2027 if (!net_eq(dev_net(ifp->idev->dev), net)) 2028 continue; 2029 if (ipv6_addr_equal(&ifp->addr, addr)) { 2030 if (!dev || ifp->idev->dev == dev || 2031 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 2032 if (in6_ifa_hold_safe(ifp)) { 2033 result = ifp; 2034 break; 2035 } 2036 } 2037 } 2038 } 2039 rcu_read_unlock(); 2040 2041 return result; 2042} 2043 2044/* Gets referenced address, destroys ifaddr */ 2045 2046static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 2047{ 2048 if (dad_failed) 2049 ifp->flags |= IFA_F_DADFAILED; 2050 2051 if (ifp->flags&IFA_F_TEMPORARY) { 2052 struct inet6_ifaddr *ifpub; 2053 spin_lock_bh(&ifp->lock); 2054 ifpub = ifp->ifpub; 2055 if (ifpub) { 2056 in6_ifa_hold(ifpub); 2057 spin_unlock_bh(&ifp->lock); 2058 ipv6_create_tempaddr(ifpub, true); 2059 in6_ifa_put(ifpub); 2060 } else { 2061 spin_unlock_bh(&ifp->lock); 2062 } 2063 ipv6_del_addr(ifp); 2064 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) { 2065 spin_lock_bh(&ifp->lock); 2066 addrconf_del_dad_work(ifp); 2067 ifp->flags |= IFA_F_TENTATIVE; 2068 if (dad_failed) 2069 ifp->flags &= ~IFA_F_OPTIMISTIC; 2070 spin_unlock_bh(&ifp->lock); 2071 if (dad_failed) 2072 ipv6_ifa_notify(0, ifp); 2073 in6_ifa_put(ifp); 2074 } else { 2075 ipv6_del_addr(ifp); 2076 } 2077} 2078 2079static int addrconf_dad_end(struct inet6_ifaddr *ifp) 2080{ 2081 int err = -ENOENT; 2082 2083 spin_lock_bh(&ifp->lock); 2084 if (ifp->state == INET6_IFADDR_STATE_DAD) { 2085 ifp->state = INET6_IFADDR_STATE_POSTDAD; 2086 err = 0; 2087 } 2088 spin_unlock_bh(&ifp->lock); 2089 2090 return err; 2091} 2092 2093void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp) 2094{ 2095 struct inet6_dev *idev = ifp->idev; 2096 struct net *net = dev_net(ifp->idev->dev); 2097 2098 if (addrconf_dad_end(ifp)) { 2099 in6_ifa_put(ifp); 2100 return; 2101 } 2102 2103 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n", 2104 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source); 2105 2106 spin_lock_bh(&ifp->lock); 2107 2108 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 2109 struct in6_addr new_addr; 2110 struct inet6_ifaddr *ifp2; 2111 int retries = ifp->stable_privacy_retry + 1; 2112 struct ifa6_config cfg = { 2113 .pfx = &new_addr, 2114 .plen = ifp->prefix_len, 2115 .ifa_flags = ifp->flags, 2116 .valid_lft = ifp->valid_lft, 2117 .preferred_lft = ifp->prefered_lft, 2118 .scope = ifp->scope, 2119 }; 2120 2121 if (retries > net->ipv6.sysctl.idgen_retries) { 2122 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 2123 ifp->idev->dev->name); 2124 goto errdad; 2125 } 2126 2127 new_addr = ifp->addr; 2128 if (ipv6_generate_stable_address(&new_addr, retries, 2129 idev)) 2130 goto errdad; 2131 2132 spin_unlock_bh(&ifp->lock); 2133 2134 if (idev->cnf.max_addresses && 2135 ipv6_count_addresses(idev) >= 2136 idev->cnf.max_addresses) 2137 goto lock_errdad; 2138 2139 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 2140 ifp->idev->dev->name); 2141 2142 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL); 2143 if (IS_ERR(ifp2)) 2144 goto lock_errdad; 2145 2146 spin_lock_bh(&ifp2->lock); 2147 ifp2->stable_privacy_retry = retries; 2148 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2149 spin_unlock_bh(&ifp2->lock); 2150 2151 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2152 in6_ifa_put(ifp2); 2153lock_errdad: 2154 spin_lock_bh(&ifp->lock); 2155 } 2156 2157errdad: 2158 /* transition from _POSTDAD to _ERRDAD */ 2159 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2160 spin_unlock_bh(&ifp->lock); 2161 2162 addrconf_mod_dad_work(ifp, 0); 2163 in6_ifa_put(ifp); 2164} 2165 2166/* Join to solicited addr multicast group. 2167 * caller must hold RTNL */ 2168void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2169{ 2170 struct in6_addr maddr; 2171 2172 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2173 return; 2174 2175 addrconf_addr_solict_mult(addr, &maddr); 2176 ipv6_dev_mc_inc(dev, &maddr); 2177} 2178 2179/* caller must hold RTNL */ 2180void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2181{ 2182 struct in6_addr maddr; 2183 2184 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2185 return; 2186 2187 addrconf_addr_solict_mult(addr, &maddr); 2188 __ipv6_dev_mc_dec(idev, &maddr); 2189} 2190 2191/* caller must hold RTNL */ 2192static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2193{ 2194 struct in6_addr addr; 2195 2196 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2197 return; 2198 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2199 if (ipv6_addr_any(&addr)) 2200 return; 2201 __ipv6_dev_ac_inc(ifp->idev, &addr); 2202} 2203 2204/* caller must hold RTNL */ 2205static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2206{ 2207 struct in6_addr addr; 2208 2209 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2210 return; 2211 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2212 if (ipv6_addr_any(&addr)) 2213 return; 2214 __ipv6_dev_ac_dec(ifp->idev, &addr); 2215} 2216 2217static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2218{ 2219 switch (dev->addr_len) { 2220 case ETH_ALEN: 2221 memcpy(eui, dev->dev_addr, 3); 2222 eui[3] = 0xFF; 2223 eui[4] = 0xFE; 2224 memcpy(eui + 5, dev->dev_addr + 3, 3); 2225 break; 2226 case EUI64_ADDR_LEN: 2227 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2228 eui[0] ^= 2; 2229 break; 2230 default: 2231 return -1; 2232 } 2233 2234 return 0; 2235} 2236 2237static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2238{ 2239 union fwnet_hwaddr *ha; 2240 2241 if (dev->addr_len != FWNET_ALEN) 2242 return -1; 2243 2244 ha = (union fwnet_hwaddr *)dev->dev_addr; 2245 2246 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2247 eui[0] ^= 2; 2248 return 0; 2249} 2250 2251static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2252{ 2253 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2254 if (dev->addr_len != ARCNET_ALEN) 2255 return -1; 2256 memset(eui, 0, 7); 2257 eui[7] = *(u8 *)dev->dev_addr; 2258 return 0; 2259} 2260 2261static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2262{ 2263 if (dev->addr_len != INFINIBAND_ALEN) 2264 return -1; 2265 memcpy(eui, dev->dev_addr + 12, 8); 2266 eui[0] |= 2; 2267 return 0; 2268} 2269 2270static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2271{ 2272 if (addr == 0) 2273 return -1; 2274 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2275 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2276 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2277 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2278 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2279 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2280 eui[1] = 0; 2281 eui[2] = 0x5E; 2282 eui[3] = 0xFE; 2283 memcpy(eui + 4, &addr, 4); 2284 return 0; 2285} 2286 2287static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2288{ 2289 if (dev->priv_flags & IFF_ISATAP) 2290 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2291 return -1; 2292} 2293 2294static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2295{ 2296 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2297} 2298 2299static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2300{ 2301 memcpy(eui, dev->perm_addr, 3); 2302 memcpy(eui + 5, dev->perm_addr + 3, 3); 2303 eui[3] = 0xFF; 2304 eui[4] = 0xFE; 2305 eui[0] ^= 2; 2306 return 0; 2307} 2308 2309static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2310{ 2311 switch (dev->type) { 2312 case ARPHRD_ETHER: 2313 case ARPHRD_FDDI: 2314 return addrconf_ifid_eui48(eui, dev); 2315 case ARPHRD_ARCNET: 2316 return addrconf_ifid_arcnet(eui, dev); 2317 case ARPHRD_INFINIBAND: 2318 return addrconf_ifid_infiniband(eui, dev); 2319 case ARPHRD_SIT: 2320 return addrconf_ifid_sit(eui, dev); 2321 case ARPHRD_IPGRE: 2322 case ARPHRD_TUNNEL: 2323 return addrconf_ifid_gre(eui, dev); 2324 case ARPHRD_6LOWPAN: 2325 return addrconf_ifid_6lowpan(eui, dev); 2326 case ARPHRD_IEEE1394: 2327 return addrconf_ifid_ieee1394(eui, dev); 2328 case ARPHRD_TUNNEL6: 2329 case ARPHRD_IP6GRE: 2330 case ARPHRD_RAWIP: 2331 return addrconf_ifid_ip6tnl(eui, dev); 2332 } 2333 return -1; 2334} 2335 2336static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2337{ 2338 int err = -1; 2339 struct inet6_ifaddr *ifp; 2340 2341 read_lock_bh(&idev->lock); 2342 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2343 if (ifp->scope > IFA_LINK) 2344 break; 2345 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2346 memcpy(eui, ifp->addr.s6_addr+8, 8); 2347 err = 0; 2348 break; 2349 } 2350 } 2351 read_unlock_bh(&idev->lock); 2352 return err; 2353} 2354 2355/* Generation of a randomized Interface Identifier 2356 * draft-ietf-6man-rfc4941bis, Section 3.3.1 2357 */ 2358 2359static void ipv6_gen_rnd_iid(struct in6_addr *addr) 2360{ 2361regen: 2362 get_random_bytes(&addr->s6_addr[8], 8); 2363 2364 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1: 2365 * check if generated address is not inappropriate: 2366 * 2367 * - Reserved IPv6 Interface Identifers 2368 * - XXX: already assigned to an address on the device 2369 */ 2370 2371 /* Subnet-router anycast: 0000:0000:0000:0000 */ 2372 if (!(addr->s6_addr32[2] | addr->s6_addr32[3])) 2373 goto regen; 2374 2375 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212 2376 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213 2377 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF 2378 */ 2379 if (ntohl(addr->s6_addr32[2]) == 0x02005eff && 2380 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000) 2381 goto regen; 2382 2383 /* Reserved subnet anycast addresses */ 2384 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff && 2385 ntohl(addr->s6_addr32[3]) >= 0Xffffff80) 2386 goto regen; 2387} 2388 2389/* 2390 * Add prefix route. 2391 */ 2392 2393static void 2394addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric, 2395 struct net_device *dev, unsigned long expires, 2396 u32 flags, gfp_t gfp_flags) 2397{ 2398 struct fib6_config cfg = { 2399 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2400 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF, 2401 .fc_ifindex = dev->ifindex, 2402 .fc_expires = expires, 2403 .fc_dst_len = plen, 2404 .fc_flags = RTF_UP | flags, 2405 .fc_nlinfo.nl_net = dev_net(dev), 2406 .fc_protocol = RTPROT_KERNEL, 2407 .fc_type = RTN_UNICAST, 2408 }; 2409 2410 cfg.fc_dst = *pfx; 2411 2412 /* Prevent useless cloning on PtP SIT. 2413 This thing is done here expecting that the whole 2414 class of non-broadcast devices need not cloning. 2415 */ 2416#if IS_ENABLED(CONFIG_IPV6_SIT) 2417 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2418 cfg.fc_flags |= RTF_NONEXTHOP; 2419#endif 2420 2421 ip6_route_add(&cfg, gfp_flags, NULL); 2422} 2423 2424 2425static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2426 int plen, 2427 const struct net_device *dev, 2428 u32 flags, u32 noflags, 2429 bool no_gw) 2430{ 2431 struct fib6_node *fn; 2432 struct fib6_info *rt = NULL; 2433 struct fib6_table *table; 2434 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2435 2436 table = fib6_get_table(dev_net(dev), tb_id); 2437 if (!table) 2438 return NULL; 2439 2440 rcu_read_lock(); 2441 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true); 2442 if (!fn) 2443 goto out; 2444 2445 for_each_fib6_node_rt_rcu(fn) { 2446 /* prefix routes only use builtin fib6_nh */ 2447 if (rt->nh) 2448 continue; 2449 2450 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex) 2451 continue; 2452 if (no_gw && rt->fib6_nh->fib_nh_gw_family) 2453 continue; 2454 if ((rt->fib6_flags & flags) != flags) 2455 continue; 2456 if ((rt->fib6_flags & noflags) != 0) 2457 continue; 2458 if (!fib6_info_hold_safe(rt)) 2459 continue; 2460 break; 2461 } 2462out: 2463 rcu_read_unlock(); 2464 return rt; 2465} 2466 2467 2468/* Create "default" multicast route to the interface */ 2469 2470static void addrconf_add_mroute(struct net_device *dev) 2471{ 2472 struct fib6_config cfg = { 2473 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2474 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2475 .fc_ifindex = dev->ifindex, 2476 .fc_dst_len = 8, 2477 .fc_flags = RTF_UP, 2478 .fc_type = RTN_MULTICAST, 2479 .fc_nlinfo.nl_net = dev_net(dev), 2480 .fc_protocol = RTPROT_KERNEL, 2481 }; 2482 2483 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2484 2485 ip6_route_add(&cfg, GFP_KERNEL, NULL); 2486} 2487 2488static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2489{ 2490 struct inet6_dev *idev; 2491 2492 ASSERT_RTNL(); 2493 2494 idev = ipv6_find_idev(dev); 2495 if (IS_ERR(idev)) 2496 return idev; 2497 2498 if (idev->cnf.disable_ipv6) 2499 return ERR_PTR(-EACCES); 2500 2501 /* Add default multicast route */ 2502 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2503 addrconf_add_mroute(dev); 2504 2505 return idev; 2506} 2507 2508static void manage_tempaddrs(struct inet6_dev *idev, 2509 struct inet6_ifaddr *ifp, 2510 __u32 valid_lft, __u32 prefered_lft, 2511 bool create, unsigned long now) 2512{ 2513 u32 flags; 2514 struct inet6_ifaddr *ift; 2515 2516 read_lock_bh(&idev->lock); 2517 /* update all temporary addresses in the list */ 2518 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2519 int age, max_valid, max_prefered; 2520 2521 if (ifp != ift->ifpub) 2522 continue; 2523 2524 /* RFC 4941 section 3.3: 2525 * If a received option will extend the lifetime of a public 2526 * address, the lifetimes of temporary addresses should 2527 * be extended, subject to the overall constraint that no 2528 * temporary addresses should ever remain "valid" or "preferred" 2529 * for a time longer than (TEMP_VALID_LIFETIME) or 2530 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2531 */ 2532 age = (now - ift->cstamp) / HZ; 2533 max_valid = idev->cnf.temp_valid_lft - age; 2534 if (max_valid < 0) 2535 max_valid = 0; 2536 2537 max_prefered = idev->cnf.temp_prefered_lft - 2538 idev->desync_factor - age; 2539 if (max_prefered < 0) 2540 max_prefered = 0; 2541 2542 if (valid_lft > max_valid) 2543 valid_lft = max_valid; 2544 2545 if (prefered_lft > max_prefered) 2546 prefered_lft = max_prefered; 2547 2548 spin_lock(&ift->lock); 2549 flags = ift->flags; 2550 ift->valid_lft = valid_lft; 2551 ift->prefered_lft = prefered_lft; 2552 ift->tstamp = now; 2553 if (prefered_lft > 0) 2554 ift->flags &= ~IFA_F_DEPRECATED; 2555 2556 spin_unlock(&ift->lock); 2557 if (!(flags&IFA_F_TENTATIVE)) 2558 ipv6_ifa_notify(0, ift); 2559 } 2560 2561 /* Also create a temporary address if it's enabled but no temporary 2562 * address currently exists. 2563 * However, we get called with valid_lft == 0, prefered_lft == 0, create == false 2564 * as part of cleanup (ie. deleting the mngtmpaddr). 2565 * We don't want that to result in creating a new temporary ip address. 2566 */ 2567 if (list_empty(&idev->tempaddr_list) && (valid_lft || prefered_lft)) 2568 create = true; 2569 2570 if (create && idev->cnf.use_tempaddr > 0) { 2571 /* When a new public address is created as described 2572 * in [ADDRCONF], also create a new temporary address. 2573 */ 2574 read_unlock_bh(&idev->lock); 2575 ipv6_create_tempaddr(ifp, false); 2576 } else { 2577 read_unlock_bh(&idev->lock); 2578 } 2579} 2580 2581static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2582{ 2583 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2584 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2585} 2586 2587int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2588 const struct prefix_info *pinfo, 2589 struct inet6_dev *in6_dev, 2590 const struct in6_addr *addr, int addr_type, 2591 u32 addr_flags, bool sllao, bool tokenized, 2592 __u32 valid_lft, u32 prefered_lft) 2593{ 2594 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2595 int create = 0, update_lft = 0; 2596 2597 if (!ifp && valid_lft) { 2598 int max_addresses = in6_dev->cnf.max_addresses; 2599 struct ifa6_config cfg = { 2600 .pfx = addr, 2601 .plen = pinfo->prefix_len, 2602 .ifa_flags = addr_flags, 2603 .valid_lft = valid_lft, 2604 .preferred_lft = prefered_lft, 2605 .scope = addr_type & IPV6_ADDR_SCOPE_MASK, 2606 }; 2607 2608#ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2609 if ((net->ipv6.devconf_all->optimistic_dad || 2610 in6_dev->cnf.optimistic_dad) && 2611 !net->ipv6.devconf_all->forwarding && sllao) 2612 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 2613#endif 2614 2615 /* Do not allow to create too much of autoconfigured 2616 * addresses; this would be too easy way to crash kernel. 2617 */ 2618 if (!max_addresses || 2619 ipv6_count_addresses(in6_dev) < max_addresses) 2620 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL); 2621 2622 if (IS_ERR_OR_NULL(ifp)) 2623 return -1; 2624 2625 create = 1; 2626 spin_lock_bh(&ifp->lock); 2627 ifp->flags |= IFA_F_MANAGETEMPADDR; 2628 ifp->cstamp = jiffies; 2629 ifp->tokenized = tokenized; 2630 spin_unlock_bh(&ifp->lock); 2631 addrconf_dad_start(ifp); 2632 } 2633 2634 if (ifp) { 2635 u32 flags; 2636 unsigned long now; 2637 u32 stored_lft; 2638 2639 /* update lifetime (RFC2462 5.5.3 e) */ 2640 spin_lock_bh(&ifp->lock); 2641 now = jiffies; 2642 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2643 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2644 else 2645 stored_lft = 0; 2646 if (!create && stored_lft) { 2647 const u32 minimum_lft = min_t(u32, 2648 stored_lft, MIN_VALID_LIFETIME); 2649 valid_lft = max(valid_lft, minimum_lft); 2650 2651 /* RFC4862 Section 5.5.3e: 2652 * "Note that the preferred lifetime of the 2653 * corresponding address is always reset to 2654 * the Preferred Lifetime in the received 2655 * Prefix Information option, regardless of 2656 * whether the valid lifetime is also reset or 2657 * ignored." 2658 * 2659 * So we should always update prefered_lft here. 2660 */ 2661 update_lft = 1; 2662 } 2663 2664 if (update_lft) { 2665 ifp->valid_lft = valid_lft; 2666 ifp->prefered_lft = prefered_lft; 2667 ifp->tstamp = now; 2668 flags = ifp->flags; 2669 ifp->flags &= ~IFA_F_DEPRECATED; 2670 spin_unlock_bh(&ifp->lock); 2671 2672 if (!(flags&IFA_F_TENTATIVE)) 2673 ipv6_ifa_notify(0, ifp); 2674 } else 2675 spin_unlock_bh(&ifp->lock); 2676 2677 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2678 create, now); 2679 2680 in6_ifa_put(ifp); 2681 addrconf_verify(); 2682 } 2683 2684 return 0; 2685} 2686EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2687 2688void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2689{ 2690 struct prefix_info *pinfo; 2691 __u32 valid_lft; 2692 __u32 prefered_lft; 2693 int addr_type, err; 2694 u32 addr_flags = 0; 2695 struct inet6_dev *in6_dev; 2696 struct net *net = dev_net(dev); 2697 2698 pinfo = (struct prefix_info *) opt; 2699 2700 if (len < sizeof(struct prefix_info)) { 2701 netdev_dbg(dev, "addrconf: prefix option too short\n"); 2702 return; 2703 } 2704 2705 /* 2706 * Validation checks ([ADDRCONF], page 19) 2707 */ 2708 2709 addr_type = ipv6_addr_type(&pinfo->prefix); 2710 2711 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2712 return; 2713 2714 valid_lft = ntohl(pinfo->valid); 2715 prefered_lft = ntohl(pinfo->prefered); 2716 2717 if (prefered_lft > valid_lft) { 2718 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2719 return; 2720 } 2721 2722 in6_dev = in6_dev_get(dev); 2723 2724 if (!in6_dev) { 2725 net_dbg_ratelimited("addrconf: device %s not configured\n", 2726 dev->name); 2727 return; 2728 } 2729 2730 if (valid_lft != 0 && valid_lft < in6_dev->cnf.accept_ra_min_lft) 2731 goto put; 2732 2733 /* 2734 * Two things going on here: 2735 * 1) Add routes for on-link prefixes 2736 * 2) Configure prefixes with the auto flag set 2737 */ 2738 2739 if (pinfo->onlink) { 2740 struct fib6_info *rt; 2741 unsigned long rt_expires; 2742 2743 /* Avoid arithmetic overflow. Really, we could 2744 * save rt_expires in seconds, likely valid_lft, 2745 * but it would require division in fib gc, that it 2746 * not good. 2747 */ 2748 if (HZ > USER_HZ) 2749 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2750 else 2751 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2752 2753 if (addrconf_finite_timeout(rt_expires)) 2754 rt_expires *= HZ; 2755 2756 rt = addrconf_get_prefix_route(&pinfo->prefix, 2757 pinfo->prefix_len, 2758 dev, 2759 RTF_ADDRCONF | RTF_PREFIX_RT, 2760 RTF_DEFAULT, true); 2761 2762 if (rt) { 2763 /* Autoconf prefix route */ 2764 if (valid_lft == 0) { 2765 ip6_del_rt(net, rt, false); 2766 rt = NULL; 2767 } else if (addrconf_finite_timeout(rt_expires)) { 2768 /* not infinity */ 2769 fib6_set_expires(rt, jiffies + rt_expires); 2770 } else { 2771 fib6_clean_expires(rt); 2772 } 2773 } else if (valid_lft) { 2774 clock_t expires = 0; 2775 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2776 if (addrconf_finite_timeout(rt_expires)) { 2777 /* not infinity */ 2778 flags |= RTF_EXPIRES; 2779 expires = jiffies_to_clock_t(rt_expires); 2780 } 2781 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2782 0, dev, expires, flags, 2783 GFP_ATOMIC); 2784 } 2785 fib6_info_release(rt); 2786 } 2787 2788 /* Try to figure out our local address for this prefix */ 2789 2790 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2791 struct in6_addr addr; 2792 bool tokenized = false, dev_addr_generated = false; 2793 2794 if (pinfo->prefix_len == 64) { 2795 memcpy(&addr, &pinfo->prefix, 8); 2796 2797 if (!ipv6_addr_any(&in6_dev->token)) { 2798 read_lock_bh(&in6_dev->lock); 2799 memcpy(addr.s6_addr + 8, 2800 in6_dev->token.s6_addr + 8, 8); 2801 read_unlock_bh(&in6_dev->lock); 2802 tokenized = true; 2803 } else if (is_addr_mode_generate_stable(in6_dev) && 2804 !ipv6_generate_stable_address(&addr, 0, 2805 in6_dev)) { 2806 addr_flags |= IFA_F_STABLE_PRIVACY; 2807 goto ok; 2808 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2809 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2810 goto put; 2811 } else { 2812 dev_addr_generated = true; 2813 } 2814 goto ok; 2815 } 2816 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2817 pinfo->prefix_len); 2818 goto put; 2819 2820ok: 2821 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2822 &addr, addr_type, 2823 addr_flags, sllao, 2824 tokenized, valid_lft, 2825 prefered_lft); 2826 if (err) 2827 goto put; 2828 2829 /* Ignore error case here because previous prefix add addr was 2830 * successful which will be notified. 2831 */ 2832 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2833 addr_type, addr_flags, sllao, 2834 tokenized, valid_lft, 2835 prefered_lft, 2836 dev_addr_generated); 2837 } 2838 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2839put: 2840 in6_dev_put(in6_dev); 2841} 2842 2843static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev, 2844 struct in6_ifreq *ireq) 2845{ 2846 struct ip_tunnel_parm p = { }; 2847 int err; 2848 2849 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4)) 2850 return -EADDRNOTAVAIL; 2851 2852 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3]; 2853 p.iph.version = 4; 2854 p.iph.ihl = 5; 2855 p.iph.protocol = IPPROTO_IPV6; 2856 p.iph.ttl = 64; 2857 2858 if (!dev->netdev_ops->ndo_tunnel_ctl) 2859 return -EOPNOTSUPP; 2860 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL); 2861 if (err) 2862 return err; 2863 2864 dev = __dev_get_by_name(net, p.name); 2865 if (!dev) 2866 return -ENOBUFS; 2867 return dev_open(dev, NULL); 2868} 2869 2870/* 2871 * Set destination address. 2872 * Special case for SIT interfaces where we create a new "virtual" 2873 * device. 2874 */ 2875int addrconf_set_dstaddr(struct net *net, void __user *arg) 2876{ 2877 struct net_device *dev; 2878 struct in6_ifreq ireq; 2879 int err = -ENODEV; 2880 2881 if (!IS_ENABLED(CONFIG_IPV6_SIT)) 2882 return -ENODEV; 2883 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2884 return -EFAULT; 2885 2886 rtnl_lock(); 2887 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2888 if (dev && dev->type == ARPHRD_SIT) 2889 err = addrconf_set_sit_dstaddr(net, dev, &ireq); 2890 rtnl_unlock(); 2891 return err; 2892} 2893 2894static int ipv6_mc_config(struct sock *sk, bool join, 2895 const struct in6_addr *addr, int ifindex) 2896{ 2897 int ret; 2898 2899 ASSERT_RTNL(); 2900 2901 lock_sock(sk); 2902 if (join) 2903 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2904 else 2905 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2906 release_sock(sk); 2907 2908 return ret; 2909} 2910 2911/* 2912 * Manual configuration of address on an interface 2913 */ 2914static int inet6_addr_add(struct net *net, int ifindex, 2915 struct ifa6_config *cfg, 2916 struct netlink_ext_ack *extack) 2917{ 2918 struct inet6_ifaddr *ifp; 2919 struct inet6_dev *idev; 2920 struct net_device *dev; 2921 unsigned long timeout; 2922 clock_t expires; 2923 u32 flags; 2924 2925 ASSERT_RTNL(); 2926 2927 if (cfg->plen > 128) 2928 return -EINVAL; 2929 2930 /* check the lifetime */ 2931 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 2932 return -EINVAL; 2933 2934 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) 2935 return -EINVAL; 2936 2937 dev = __dev_get_by_index(net, ifindex); 2938 if (!dev) 2939 return -ENODEV; 2940 2941 idev = addrconf_add_dev(dev); 2942 if (IS_ERR(idev)) 2943 return PTR_ERR(idev); 2944 2945 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2946 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2947 true, cfg->pfx, ifindex); 2948 2949 if (ret < 0) 2950 return ret; 2951 } 2952 2953 cfg->scope = ipv6_addr_scope(cfg->pfx); 2954 2955 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 2956 if (addrconf_finite_timeout(timeout)) { 2957 expires = jiffies_to_clock_t(timeout * HZ); 2958 cfg->valid_lft = timeout; 2959 flags = RTF_EXPIRES; 2960 } else { 2961 expires = 0; 2962 flags = 0; 2963 cfg->ifa_flags |= IFA_F_PERMANENT; 2964 } 2965 2966 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 2967 if (addrconf_finite_timeout(timeout)) { 2968 if (timeout == 0) 2969 cfg->ifa_flags |= IFA_F_DEPRECATED; 2970 cfg->preferred_lft = timeout; 2971 } 2972 2973 ifp = ipv6_add_addr(idev, cfg, true, extack); 2974 if (!IS_ERR(ifp)) { 2975 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 2976 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 2977 ifp->rt_priority, dev, expires, 2978 flags, GFP_KERNEL); 2979 } 2980 2981 /* Send a netlink notification if DAD is enabled and 2982 * optimistic flag is not set 2983 */ 2984 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD))) 2985 ipv6_ifa_notify(0, ifp); 2986 /* 2987 * Note that section 3.1 of RFC 4429 indicates 2988 * that the Optimistic flag should not be set for 2989 * manually configured addresses 2990 */ 2991 addrconf_dad_start(ifp); 2992 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR) 2993 manage_tempaddrs(idev, ifp, cfg->valid_lft, 2994 cfg->preferred_lft, true, jiffies); 2995 in6_ifa_put(ifp); 2996 addrconf_verify_rtnl(); 2997 return 0; 2998 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2999 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false, 3000 cfg->pfx, ifindex); 3001 } 3002 3003 return PTR_ERR(ifp); 3004} 3005 3006static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 3007 const struct in6_addr *pfx, unsigned int plen) 3008{ 3009 struct inet6_ifaddr *ifp; 3010 struct inet6_dev *idev; 3011 struct net_device *dev; 3012 3013 if (plen > 128) 3014 return -EINVAL; 3015 3016 dev = __dev_get_by_index(net, ifindex); 3017 if (!dev) 3018 return -ENODEV; 3019 3020 idev = __in6_dev_get(dev); 3021 if (!idev) 3022 return -ENXIO; 3023 3024 read_lock_bh(&idev->lock); 3025 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3026 if (ifp->prefix_len == plen && 3027 ipv6_addr_equal(pfx, &ifp->addr)) { 3028 in6_ifa_hold(ifp); 3029 read_unlock_bh(&idev->lock); 3030 3031 if (!(ifp->flags & IFA_F_TEMPORARY) && 3032 (ifa_flags & IFA_F_MANAGETEMPADDR)) 3033 manage_tempaddrs(idev, ifp, 0, 0, false, 3034 jiffies); 3035 ipv6_del_addr(ifp); 3036 addrconf_verify_rtnl(); 3037 if (ipv6_addr_is_multicast(pfx)) { 3038 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 3039 false, pfx, dev->ifindex); 3040 } 3041 return 0; 3042 } 3043 } 3044 read_unlock_bh(&idev->lock); 3045 return -EADDRNOTAVAIL; 3046} 3047 3048 3049int addrconf_add_ifaddr(struct net *net, void __user *arg) 3050{ 3051 struct ifa6_config cfg = { 3052 .ifa_flags = IFA_F_PERMANENT, 3053 .preferred_lft = INFINITY_LIFE_TIME, 3054 .valid_lft = INFINITY_LIFE_TIME, 3055 }; 3056 struct in6_ifreq ireq; 3057 int err; 3058 3059 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3060 return -EPERM; 3061 3062 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3063 return -EFAULT; 3064 3065 cfg.pfx = &ireq.ifr6_addr; 3066 cfg.plen = ireq.ifr6_prefixlen; 3067 3068 rtnl_lock(); 3069 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL); 3070 rtnl_unlock(); 3071 return err; 3072} 3073 3074int addrconf_del_ifaddr(struct net *net, void __user *arg) 3075{ 3076 struct in6_ifreq ireq; 3077 int err; 3078 3079 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3080 return -EPERM; 3081 3082 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3083 return -EFAULT; 3084 3085 rtnl_lock(); 3086 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 3087 ireq.ifr6_prefixlen); 3088 rtnl_unlock(); 3089 return err; 3090} 3091 3092static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 3093 int plen, int scope) 3094{ 3095 struct inet6_ifaddr *ifp; 3096 struct ifa6_config cfg = { 3097 .pfx = addr, 3098 .plen = plen, 3099 .ifa_flags = IFA_F_PERMANENT, 3100 .valid_lft = INFINITY_LIFE_TIME, 3101 .preferred_lft = INFINITY_LIFE_TIME, 3102 .scope = scope 3103 }; 3104 3105 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3106 if (!IS_ERR(ifp)) { 3107 spin_lock_bh(&ifp->lock); 3108 ifp->flags &= ~IFA_F_TENTATIVE; 3109 spin_unlock_bh(&ifp->lock); 3110 rt_genid_bump_ipv6(dev_net(idev->dev)); 3111 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3112 in6_ifa_put(ifp); 3113 } 3114} 3115 3116#if IS_ENABLED(CONFIG_IPV6_SIT) 3117static void sit_add_v4_addrs(struct inet6_dev *idev) 3118{ 3119 struct in6_addr addr; 3120 struct net_device *dev; 3121 struct net *net = dev_net(idev->dev); 3122 int scope, plen; 3123 u32 pflags = 0; 3124 3125 ASSERT_RTNL(); 3126 3127 memset(&addr, 0, sizeof(struct in6_addr)); 3128 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 3129 3130 if (idev->dev->flags&IFF_POINTOPOINT) { 3131 if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE) 3132 return; 3133 3134 addr.s6_addr32[0] = htonl(0xfe800000); 3135 scope = IFA_LINK; 3136 plen = 64; 3137 } else { 3138 scope = IPV6_ADDR_COMPATv4; 3139 plen = 96; 3140 pflags |= RTF_NONEXTHOP; 3141 } 3142 3143 if (addr.s6_addr32[3]) { 3144 add_addr(idev, &addr, plen, scope); 3145 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags, 3146 GFP_KERNEL); 3147 return; 3148 } 3149 3150 for_each_netdev(net, dev) { 3151 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3152 if (in_dev && (dev->flags & IFF_UP)) { 3153 struct in_ifaddr *ifa; 3154 int flag = scope; 3155 3156 in_dev_for_each_ifa_rtnl(ifa, in_dev) { 3157 addr.s6_addr32[3] = ifa->ifa_local; 3158 3159 if (ifa->ifa_scope == RT_SCOPE_LINK) 3160 continue; 3161 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3162 if (idev->dev->flags&IFF_POINTOPOINT) 3163 continue; 3164 flag |= IFA_HOST; 3165 } 3166 3167 add_addr(idev, &addr, plen, flag); 3168 addrconf_prefix_route(&addr, plen, 0, idev->dev, 3169 0, pflags, GFP_KERNEL); 3170 } 3171 } 3172 } 3173} 3174#endif 3175 3176static void init_loopback(struct net_device *dev) 3177{ 3178 struct inet6_dev *idev; 3179 3180 /* ::1 */ 3181 3182 ASSERT_RTNL(); 3183 3184 idev = ipv6_find_idev(dev); 3185 if (IS_ERR(idev)) { 3186 pr_debug("%s: add_dev failed\n", __func__); 3187 return; 3188 } 3189 3190 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 3191} 3192 3193void addrconf_add_linklocal(struct inet6_dev *idev, 3194 const struct in6_addr *addr, u32 flags) 3195{ 3196 struct ifa6_config cfg = { 3197 .pfx = addr, 3198 .plen = 64, 3199 .ifa_flags = flags | IFA_F_PERMANENT, 3200 .valid_lft = INFINITY_LIFE_TIME, 3201 .preferred_lft = INFINITY_LIFE_TIME, 3202 .scope = IFA_LINK 3203 }; 3204 struct inet6_ifaddr *ifp; 3205 3206#ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3207 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad || 3208 idev->cnf.optimistic_dad) && 3209 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3210 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 3211#endif 3212 3213 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3214 if (!IS_ERR(ifp)) { 3215 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev, 3216 0, 0, GFP_ATOMIC); 3217 addrconf_dad_start(ifp); 3218 in6_ifa_put(ifp); 3219 } 3220} 3221EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3222 3223static bool ipv6_reserved_interfaceid(struct in6_addr address) 3224{ 3225 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3226 return true; 3227 3228 if (address.s6_addr32[2] == htonl(0x02005eff) && 3229 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3230 return true; 3231 3232 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3233 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3234 return true; 3235 3236 return false; 3237} 3238 3239static int ipv6_generate_stable_address(struct in6_addr *address, 3240 u8 dad_count, 3241 const struct inet6_dev *idev) 3242{ 3243 static DEFINE_SPINLOCK(lock); 3244 static __u32 digest[SHA1_DIGEST_WORDS]; 3245 static __u32 workspace[SHA1_WORKSPACE_WORDS]; 3246 3247 static union { 3248 char __data[SHA1_BLOCK_SIZE]; 3249 struct { 3250 struct in6_addr secret; 3251 __be32 prefix[2]; 3252 unsigned char hwaddr[MAX_ADDR_LEN]; 3253 u8 dad_count; 3254 } __packed; 3255 } data; 3256 3257 struct in6_addr secret; 3258 struct in6_addr temp; 3259 struct net *net = dev_net(idev->dev); 3260 3261 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3262 3263 if (idev->cnf.stable_secret.initialized) 3264 secret = idev->cnf.stable_secret.secret; 3265 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3266 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3267 else 3268 return -1; 3269 3270retry: 3271 spin_lock_bh(&lock); 3272 3273 sha1_init(digest); 3274 memset(&data, 0, sizeof(data)); 3275 memset(workspace, 0, sizeof(workspace)); 3276 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3277 data.prefix[0] = address->s6_addr32[0]; 3278 data.prefix[1] = address->s6_addr32[1]; 3279 data.secret = secret; 3280 data.dad_count = dad_count; 3281 3282 sha1_transform(digest, data.__data, workspace); 3283 3284 temp = *address; 3285 temp.s6_addr32[2] = (__force __be32)digest[0]; 3286 temp.s6_addr32[3] = (__force __be32)digest[1]; 3287 3288 spin_unlock_bh(&lock); 3289 3290 if (ipv6_reserved_interfaceid(temp)) { 3291 dad_count++; 3292 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3293 return -1; 3294 goto retry; 3295 } 3296 3297 *address = temp; 3298 return 0; 3299} 3300 3301static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3302{ 3303 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3304 3305 if (s->initialized) 3306 return; 3307 s = &idev->cnf.stable_secret; 3308 get_random_bytes(&s->secret, sizeof(s->secret)); 3309 s->initialized = true; 3310} 3311 3312static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3313{ 3314 struct in6_addr addr; 3315 3316 /* no link local addresses on L3 master devices */ 3317 if (netif_is_l3_master(idev->dev)) 3318 return; 3319 3320 /* no link local addresses on devices flagged as slaves */ 3321 if (idev->dev->flags & IFF_SLAVE) 3322 return; 3323 3324 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3325 3326 switch (idev->cnf.addr_gen_mode) { 3327 case IN6_ADDR_GEN_MODE_RANDOM: 3328 ipv6_gen_mode_random_init(idev); 3329 fallthrough; 3330 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3331 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3332 addrconf_add_linklocal(idev, &addr, 3333 IFA_F_STABLE_PRIVACY); 3334 else if (prefix_route) 3335 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3336 0, 0, GFP_KERNEL); 3337 break; 3338 case IN6_ADDR_GEN_MODE_EUI64: 3339 /* addrconf_add_linklocal also adds a prefix_route and we 3340 * only need to care about prefix routes if ipv6_generate_eui64 3341 * couldn't generate one. 3342 */ 3343 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3344 addrconf_add_linklocal(idev, &addr, 0); 3345 else if (prefix_route) 3346 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3347 0, 0, GFP_KERNEL); 3348 break; 3349 case IN6_ADDR_GEN_MODE_NONE: 3350 default: 3351 /* will not add any link local address */ 3352 break; 3353 } 3354} 3355 3356static void addrconf_dev_config(struct net_device *dev) 3357{ 3358 struct inet6_dev *idev; 3359 3360 ASSERT_RTNL(); 3361 3362 if ((dev->type != ARPHRD_ETHER) && 3363 (dev->type != ARPHRD_FDDI) && 3364 (dev->type != ARPHRD_ARCNET) && 3365 (dev->type != ARPHRD_INFINIBAND) && 3366 (dev->type != ARPHRD_IEEE1394) && 3367 (dev->type != ARPHRD_TUNNEL6) && 3368 (dev->type != ARPHRD_6LOWPAN) && 3369 (dev->type != ARPHRD_IP6GRE) && 3370 (dev->type != ARPHRD_IPGRE) && 3371 (dev->type != ARPHRD_TUNNEL) && 3372 (dev->type != ARPHRD_NONE) && 3373 (dev->type != ARPHRD_RAWIP)) { 3374 /* Alas, we support only Ethernet autoconfiguration. */ 3375 idev = __in6_dev_get(dev); 3376 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP && 3377 dev->flags & IFF_MULTICAST) 3378 ipv6_mc_up(idev); 3379 return; 3380 } 3381 3382 idev = addrconf_add_dev(dev); 3383 if (IS_ERR(idev)) 3384 return; 3385 3386 /* this device type has no EUI support */ 3387 if (dev->type == ARPHRD_NONE && 3388 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3389 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3390 3391 addrconf_addr_gen(idev, false); 3392} 3393 3394#if IS_ENABLED(CONFIG_IPV6_SIT) 3395static void addrconf_sit_config(struct net_device *dev) 3396{ 3397 struct inet6_dev *idev; 3398 3399 ASSERT_RTNL(); 3400 3401 /* 3402 * Configure the tunnel with one of our IPv4 3403 * addresses... we should configure all of 3404 * our v4 addrs in the tunnel 3405 */ 3406 3407 idev = ipv6_find_idev(dev); 3408 if (IS_ERR(idev)) { 3409 pr_debug("%s: add_dev failed\n", __func__); 3410 return; 3411 } 3412 3413 if (dev->priv_flags & IFF_ISATAP) { 3414 addrconf_addr_gen(idev, false); 3415 return; 3416 } 3417 3418 sit_add_v4_addrs(idev); 3419 3420 if (dev->flags&IFF_POINTOPOINT) 3421 addrconf_add_mroute(dev); 3422} 3423#endif 3424 3425#if IS_ENABLED(CONFIG_NET_IPGRE) 3426static void addrconf_gre_config(struct net_device *dev) 3427{ 3428 struct inet6_dev *idev; 3429 3430 ASSERT_RTNL(); 3431 3432 idev = ipv6_find_idev(dev); 3433 if (IS_ERR(idev)) { 3434 pr_debug("%s: add_dev failed\n", __func__); 3435 return; 3436 } 3437 3438 addrconf_addr_gen(idev, true); 3439 if (dev->flags & IFF_POINTOPOINT) 3440 addrconf_add_mroute(dev); 3441} 3442#endif 3443 3444static int fixup_permanent_addr(struct net *net, 3445 struct inet6_dev *idev, 3446 struct inet6_ifaddr *ifp) 3447{ 3448 /* !fib6_node means the host route was removed from the 3449 * FIB, for example, if 'lo' device is taken down. In that 3450 * case regenerate the host route. 3451 */ 3452 if (!ifp->rt || !ifp->rt->fib6_node) { 3453 struct fib6_info *f6i, *prev; 3454 3455 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false, 3456 GFP_ATOMIC); 3457 if (IS_ERR(f6i)) 3458 return PTR_ERR(f6i); 3459 3460 /* ifp->rt can be accessed outside of rtnl */ 3461 spin_lock(&ifp->lock); 3462 prev = ifp->rt; 3463 ifp->rt = f6i; 3464 spin_unlock(&ifp->lock); 3465 3466 fib6_info_release(prev); 3467 } 3468 3469 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3470 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3471 ifp->rt_priority, idev->dev, 0, 0, 3472 GFP_ATOMIC); 3473 } 3474 3475 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3476 addrconf_dad_start(ifp); 3477 3478 return 0; 3479} 3480 3481static void addrconf_permanent_addr(struct net *net, struct net_device *dev) 3482{ 3483 struct inet6_ifaddr *ifp, *tmp; 3484 struct inet6_dev *idev; 3485 3486 idev = __in6_dev_get(dev); 3487 if (!idev) 3488 return; 3489 3490 write_lock_bh(&idev->lock); 3491 3492 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3493 if ((ifp->flags & IFA_F_PERMANENT) && 3494 fixup_permanent_addr(net, idev, ifp) < 0) { 3495 write_unlock_bh(&idev->lock); 3496 in6_ifa_hold(ifp); 3497 ipv6_del_addr(ifp); 3498 write_lock_bh(&idev->lock); 3499 3500 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3501 idev->dev->name, &ifp->addr); 3502 } 3503 } 3504 3505 write_unlock_bh(&idev->lock); 3506} 3507 3508static int addrconf_notify(struct notifier_block *this, unsigned long event, 3509 void *ptr) 3510{ 3511 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3512 struct netdev_notifier_change_info *change_info; 3513 struct netdev_notifier_changeupper_info *info; 3514 struct inet6_dev *idev = __in6_dev_get(dev); 3515 struct net *net = dev_net(dev); 3516 int run_pending = 0; 3517 int err; 3518 3519 switch (event) { 3520 case NETDEV_REGISTER: 3521 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3522 idev = ipv6_add_dev(dev); 3523 if (IS_ERR(idev)) 3524 return notifier_from_errno(PTR_ERR(idev)); 3525 } 3526 break; 3527 3528 case NETDEV_CHANGEMTU: 3529 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3530 if (dev->mtu < IPV6_MIN_MTU) { 3531 addrconf_ifdown(dev, dev != net->loopback_dev); 3532 break; 3533 } 3534 3535 if (idev) { 3536 rt6_mtu_change(dev, dev->mtu); 3537 idev->cnf.mtu6 = dev->mtu; 3538 break; 3539 } 3540 3541 /* allocate new idev */ 3542 idev = ipv6_add_dev(dev); 3543 if (IS_ERR(idev)) 3544 break; 3545 3546 /* device is still not ready */ 3547 if (!(idev->if_flags & IF_READY)) 3548 break; 3549 3550 run_pending = 1; 3551 fallthrough; 3552 case NETDEV_UP: 3553 case NETDEV_CHANGE: 3554 if (dev->flags & IFF_SLAVE) 3555 break; 3556 3557 if (idev && idev->cnf.disable_ipv6) 3558 break; 3559 3560 if (event == NETDEV_UP) { 3561 /* restore routes for permanent addresses */ 3562 addrconf_permanent_addr(net, dev); 3563 3564 if (!addrconf_link_ready(dev)) { 3565 /* device is not ready yet. */ 3566 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3567 dev->name); 3568 break; 3569 } 3570 3571 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3572 idev = ipv6_add_dev(dev); 3573 3574 if (!IS_ERR_OR_NULL(idev)) { 3575 idev->if_flags |= IF_READY; 3576 run_pending = 1; 3577 } 3578 } else if (event == NETDEV_CHANGE) { 3579 if (!addrconf_link_ready(dev)) { 3580 /* device is still not ready. */ 3581 rt6_sync_down_dev(dev, event); 3582 break; 3583 } 3584 3585 if (!IS_ERR_OR_NULL(idev)) { 3586 if (idev->if_flags & IF_READY) { 3587 /* device is already configured - 3588 * but resend MLD reports, we might 3589 * have roamed and need to update 3590 * multicast snooping switches 3591 */ 3592 ipv6_mc_up(idev); 3593 change_info = ptr; 3594 if (change_info->flags_changed & IFF_NOARP) 3595 addrconf_dad_run(idev, true); 3596 rt6_sync_up(dev, RTNH_F_LINKDOWN); 3597 break; 3598 } 3599 idev->if_flags |= IF_READY; 3600 } 3601 3602 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3603 dev->name); 3604 3605 run_pending = 1; 3606 } 3607 3608 switch (dev->type) { 3609#if IS_ENABLED(CONFIG_IPV6_SIT) 3610 case ARPHRD_SIT: 3611 addrconf_sit_config(dev); 3612 break; 3613#endif 3614#if IS_ENABLED(CONFIG_NET_IPGRE) 3615 case ARPHRD_IPGRE: 3616 addrconf_gre_config(dev); 3617 break; 3618#endif 3619 case ARPHRD_LOOPBACK: 3620 init_loopback(dev); 3621 break; 3622 3623 default: 3624 addrconf_dev_config(dev); 3625 break; 3626 } 3627 3628 if (!IS_ERR_OR_NULL(idev)) { 3629 if (run_pending) 3630 addrconf_dad_run(idev, false); 3631 3632 /* Device has an address by now */ 3633 rt6_sync_up(dev, RTNH_F_DEAD); 3634 3635 /* 3636 * If the MTU changed during the interface down, 3637 * when the interface up, the changed MTU must be 3638 * reflected in the idev as well as routers. 3639 */ 3640 if (idev->cnf.mtu6 != dev->mtu && 3641 dev->mtu >= IPV6_MIN_MTU) { 3642 rt6_mtu_change(dev, dev->mtu); 3643 idev->cnf.mtu6 = dev->mtu; 3644 } 3645 idev->tstamp = jiffies; 3646 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3647 3648 /* 3649 * If the changed mtu during down is lower than 3650 * IPV6_MIN_MTU stop IPv6 on this interface. 3651 */ 3652 if (dev->mtu < IPV6_MIN_MTU) 3653 addrconf_ifdown(dev, dev != net->loopback_dev); 3654 } 3655 break; 3656 3657 case NETDEV_DOWN: 3658 case NETDEV_UNREGISTER: 3659 /* 3660 * Remove all addresses from this interface. 3661 */ 3662 addrconf_ifdown(dev, event != NETDEV_DOWN); 3663 break; 3664 3665 case NETDEV_CHANGENAME: 3666 if (idev) { 3667 snmp6_unregister_dev(idev); 3668 addrconf_sysctl_unregister(idev); 3669 err = addrconf_sysctl_register(idev); 3670 if (err) 3671 return notifier_from_errno(err); 3672 err = snmp6_register_dev(idev); 3673 if (err) { 3674 addrconf_sysctl_unregister(idev); 3675 return notifier_from_errno(err); 3676 } 3677 } 3678 break; 3679 3680 case NETDEV_PRE_TYPE_CHANGE: 3681 case NETDEV_POST_TYPE_CHANGE: 3682 if (idev) 3683 addrconf_type_change(dev, event); 3684 break; 3685 3686 case NETDEV_CHANGEUPPER: 3687 info = ptr; 3688 3689 /* flush all routes if dev is linked to or unlinked from 3690 * an L3 master device (e.g., VRF) 3691 */ 3692 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3693 addrconf_ifdown(dev, false); 3694 } 3695 3696 return NOTIFY_OK; 3697} 3698 3699/* 3700 * addrconf module should be notified of a device going up 3701 */ 3702static struct notifier_block ipv6_dev_notf = { 3703 .notifier_call = addrconf_notify, 3704 .priority = ADDRCONF_NOTIFY_PRIORITY, 3705}; 3706 3707static void addrconf_type_change(struct net_device *dev, unsigned long event) 3708{ 3709 struct inet6_dev *idev; 3710 ASSERT_RTNL(); 3711 3712 idev = __in6_dev_get(dev); 3713 3714 if (event == NETDEV_POST_TYPE_CHANGE) 3715 ipv6_mc_remap(idev); 3716 else if (event == NETDEV_PRE_TYPE_CHANGE) 3717 ipv6_mc_unmap(idev); 3718} 3719 3720static bool addr_is_local(const struct in6_addr *addr) 3721{ 3722 return ipv6_addr_type(addr) & 3723 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3724} 3725 3726static int addrconf_ifdown(struct net_device *dev, bool unregister) 3727{ 3728 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN; 3729 struct net *net = dev_net(dev); 3730 struct inet6_dev *idev; 3731 struct inet6_ifaddr *ifa; 3732 LIST_HEAD(tmp_addr_list); 3733 bool keep_addr = false; 3734 bool was_ready; 3735 int state, i; 3736 3737 ASSERT_RTNL(); 3738 3739 rt6_disable_ip(dev, event); 3740 3741 idev = __in6_dev_get(dev); 3742 if (!idev) 3743 return -ENODEV; 3744 3745 /* 3746 * Step 1: remove reference to ipv6 device from parent device. 3747 * Do not dev_put! 3748 */ 3749 if (unregister) { 3750 idev->dead = 1; 3751 3752 /* protected by rtnl_lock */ 3753 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3754 3755 /* Step 1.5: remove snmp6 entry */ 3756 snmp6_unregister_dev(idev); 3757 3758 } 3759 3760 /* combine the user config with event to determine if permanent 3761 * addresses are to be removed from address hash table 3762 */ 3763 if (!unregister && !idev->cnf.disable_ipv6) { 3764 /* aggregate the system setting and interface setting */ 3765 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3766 3767 if (!_keep_addr) 3768 _keep_addr = idev->cnf.keep_addr_on_down; 3769 3770 keep_addr = (_keep_addr > 0); 3771 } 3772 3773 /* Step 2: clear hash table */ 3774 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3775 struct hlist_head *h = &inet6_addr_lst[i]; 3776 3777 spin_lock_bh(&addrconf_hash_lock); 3778restart: 3779 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3780 if (ifa->idev == idev) { 3781 addrconf_del_dad_work(ifa); 3782 /* combined flag + permanent flag decide if 3783 * address is retained on a down event 3784 */ 3785 if (!keep_addr || 3786 !(ifa->flags & IFA_F_PERMANENT) || 3787 addr_is_local(&ifa->addr)) { 3788 hlist_del_init_rcu(&ifa->addr_lst); 3789 goto restart; 3790 } 3791 } 3792 } 3793 spin_unlock_bh(&addrconf_hash_lock); 3794 } 3795 3796 write_lock_bh(&idev->lock); 3797 3798 addrconf_del_rs_timer(idev); 3799 3800 /* Step 2: clear flags for stateless addrconf, repeated down 3801 * detection 3802 */ 3803 was_ready = idev->if_flags & IF_READY; 3804 if (!unregister) 3805 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3806 3807 /* Step 3: clear tempaddr list */ 3808 while (!list_empty(&idev->tempaddr_list)) { 3809 ifa = list_first_entry(&idev->tempaddr_list, 3810 struct inet6_ifaddr, tmp_list); 3811 list_del(&ifa->tmp_list); 3812 write_unlock_bh(&idev->lock); 3813 spin_lock_bh(&ifa->lock); 3814 3815 if (ifa->ifpub) { 3816 in6_ifa_put(ifa->ifpub); 3817 ifa->ifpub = NULL; 3818 } 3819 spin_unlock_bh(&ifa->lock); 3820 in6_ifa_put(ifa); 3821 write_lock_bh(&idev->lock); 3822 } 3823 3824 list_for_each_entry(ifa, &idev->addr_list, if_list) 3825 list_add_tail(&ifa->if_list_aux, &tmp_addr_list); 3826 write_unlock_bh(&idev->lock); 3827 3828 while (!list_empty(&tmp_addr_list)) { 3829 struct fib6_info *rt = NULL; 3830 bool keep; 3831 3832 ifa = list_first_entry(&tmp_addr_list, 3833 struct inet6_ifaddr, if_list_aux); 3834 list_del(&ifa->if_list_aux); 3835 3836 addrconf_del_dad_work(ifa); 3837 3838 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3839 !addr_is_local(&ifa->addr); 3840 3841 spin_lock_bh(&ifa->lock); 3842 3843 if (keep) { 3844 /* set state to skip the notifier below */ 3845 state = INET6_IFADDR_STATE_DEAD; 3846 ifa->state = INET6_IFADDR_STATE_PREDAD; 3847 if (!(ifa->flags & IFA_F_NODAD)) 3848 ifa->flags |= IFA_F_TENTATIVE; 3849 3850 rt = ifa->rt; 3851 ifa->rt = NULL; 3852 } else { 3853 state = ifa->state; 3854 ifa->state = INET6_IFADDR_STATE_DEAD; 3855 } 3856 3857 spin_unlock_bh(&ifa->lock); 3858 3859 if (rt) 3860 ip6_del_rt(net, rt, false); 3861 3862 if (state != INET6_IFADDR_STATE_DEAD) { 3863 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3864 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3865 } else { 3866 if (idev->cnf.forwarding) 3867 addrconf_leave_anycast(ifa); 3868 addrconf_leave_solict(ifa->idev, &ifa->addr); 3869 } 3870 3871 if (!keep) { 3872 write_lock_bh(&idev->lock); 3873 list_del_rcu(&ifa->if_list); 3874 write_unlock_bh(&idev->lock); 3875 in6_ifa_put(ifa); 3876 } 3877 } 3878 3879 /* Step 5: Discard anycast and multicast list */ 3880 if (unregister) { 3881 ipv6_ac_destroy_dev(idev); 3882 ipv6_mc_destroy_dev(idev); 3883 } else if (was_ready) { 3884 ipv6_mc_down(idev); 3885 } 3886 3887 idev->tstamp = jiffies; 3888 3889 /* Last: Shot the device (if unregistered) */ 3890 if (unregister) { 3891 addrconf_sysctl_unregister(idev); 3892 neigh_parms_release(&nd_tbl, idev->nd_parms); 3893 neigh_ifdown(&nd_tbl, dev); 3894 in6_dev_put(idev); 3895 } 3896 return 0; 3897} 3898 3899static void addrconf_rs_timer(struct timer_list *t) 3900{ 3901 struct inet6_dev *idev = from_timer(idev, t, rs_timer); 3902 struct net_device *dev = idev->dev; 3903 struct in6_addr lladdr; 3904 3905 write_lock(&idev->lock); 3906 if (idev->dead || !(idev->if_flags & IF_READY)) 3907 goto out; 3908 3909 if (!ipv6_accept_ra(idev)) 3910 goto out; 3911 3912 /* Announcement received after solicitation was sent */ 3913 if (idev->if_flags & IF_RA_RCVD) 3914 goto out; 3915 3916 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3917 write_unlock(&idev->lock); 3918 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3919 ndisc_send_rs(dev, &lladdr, 3920 &in6addr_linklocal_allrouters); 3921 else 3922 goto put; 3923 3924 write_lock(&idev->lock); 3925 idev->rs_interval = rfc3315_s14_backoff_update( 3926 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3927 /* The wait after the last probe can be shorter */ 3928 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3929 idev->cnf.rtr_solicits) ? 3930 idev->cnf.rtr_solicit_delay : 3931 idev->rs_interval); 3932 } else { 3933 /* 3934 * Note: we do not support deprecated "all on-link" 3935 * assumption any longer. 3936 */ 3937 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3938 } 3939 3940out: 3941 write_unlock(&idev->lock); 3942put: 3943 in6_dev_put(idev); 3944} 3945 3946/* 3947 * Duplicate Address Detection 3948 */ 3949static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3950{ 3951 unsigned long rand_num; 3952 struct inet6_dev *idev = ifp->idev; 3953 u64 nonce; 3954 3955 if (ifp->flags & IFA_F_OPTIMISTIC) 3956 rand_num = 0; 3957 else 3958 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3959 3960 nonce = 0; 3961 if (idev->cnf.enhanced_dad || 3962 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 3963 do 3964 get_random_bytes(&nonce, 6); 3965 while (nonce == 0); 3966 } 3967 ifp->dad_nonce = nonce; 3968 ifp->dad_probes = idev->cnf.dad_transmits; 3969 addrconf_mod_dad_work(ifp, rand_num); 3970} 3971 3972static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3973{ 3974 struct inet6_dev *idev = ifp->idev; 3975 struct net_device *dev = idev->dev; 3976 bool bump_id, notify = false; 3977 struct net *net; 3978 3979 addrconf_join_solict(dev, &ifp->addr); 3980 3981 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3982 3983 read_lock_bh(&idev->lock); 3984 spin_lock(&ifp->lock); 3985 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3986 goto out; 3987 3988 net = dev_net(dev); 3989 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3990 (net->ipv6.devconf_all->accept_dad < 1 && 3991 idev->cnf.accept_dad < 1) || 3992 !(ifp->flags&IFA_F_TENTATIVE) || 3993 ifp->flags & IFA_F_NODAD) { 3994 bool send_na = false; 3995 3996 if (ifp->flags & IFA_F_TENTATIVE && 3997 !(ifp->flags & IFA_F_OPTIMISTIC)) 3998 send_na = true; 3999 bump_id = ifp->flags & IFA_F_TENTATIVE; 4000 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4001 spin_unlock(&ifp->lock); 4002 read_unlock_bh(&idev->lock); 4003 4004 addrconf_dad_completed(ifp, bump_id, send_na); 4005 return; 4006 } 4007 4008 if (!(idev->if_flags & IF_READY)) { 4009 spin_unlock(&ifp->lock); 4010 read_unlock_bh(&idev->lock); 4011 /* 4012 * If the device is not ready: 4013 * - keep it tentative if it is a permanent address. 4014 * - otherwise, kill it. 4015 */ 4016 in6_ifa_hold(ifp); 4017 addrconf_dad_stop(ifp, 0); 4018 return; 4019 } 4020 4021 /* 4022 * Optimistic nodes can start receiving 4023 * Frames right away 4024 */ 4025 if (ifp->flags & IFA_F_OPTIMISTIC) { 4026 ip6_ins_rt(net, ifp->rt); 4027 if (ipv6_use_optimistic_addr(net, idev)) { 4028 /* Because optimistic nodes can use this address, 4029 * notify listeners. If DAD fails, RTM_DELADDR is sent. 4030 */ 4031 notify = true; 4032 } 4033 } 4034 4035 addrconf_dad_kick(ifp); 4036out: 4037 spin_unlock(&ifp->lock); 4038 read_unlock_bh(&idev->lock); 4039 if (notify) 4040 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4041} 4042 4043static void addrconf_dad_start(struct inet6_ifaddr *ifp) 4044{ 4045 bool begin_dad = false; 4046 4047 spin_lock_bh(&ifp->lock); 4048 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 4049 ifp->state = INET6_IFADDR_STATE_PREDAD; 4050 begin_dad = true; 4051 } 4052 spin_unlock_bh(&ifp->lock); 4053 4054 if (begin_dad) 4055 addrconf_mod_dad_work(ifp, 0); 4056} 4057 4058static void addrconf_dad_work(struct work_struct *w) 4059{ 4060 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 4061 struct inet6_ifaddr, 4062 dad_work); 4063 struct inet6_dev *idev = ifp->idev; 4064 bool bump_id, disable_ipv6 = false; 4065 struct in6_addr mcaddr; 4066 4067 enum { 4068 DAD_PROCESS, 4069 DAD_BEGIN, 4070 DAD_ABORT, 4071 } action = DAD_PROCESS; 4072 4073 rtnl_lock(); 4074 4075 spin_lock_bh(&ifp->lock); 4076 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 4077 action = DAD_BEGIN; 4078 ifp->state = INET6_IFADDR_STATE_DAD; 4079 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 4080 action = DAD_ABORT; 4081 ifp->state = INET6_IFADDR_STATE_POSTDAD; 4082 4083 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 || 4084 idev->cnf.accept_dad > 1) && 4085 !idev->cnf.disable_ipv6 && 4086 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 4087 struct in6_addr addr; 4088 4089 addr.s6_addr32[0] = htonl(0xfe800000); 4090 addr.s6_addr32[1] = 0; 4091 4092 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 4093 ipv6_addr_equal(&ifp->addr, &addr)) { 4094 /* DAD failed for link-local based on MAC */ 4095 idev->cnf.disable_ipv6 = 1; 4096 4097 pr_info("%s: IPv6 being disabled!\n", 4098 ifp->idev->dev->name); 4099 disable_ipv6 = true; 4100 } 4101 } 4102 } 4103 spin_unlock_bh(&ifp->lock); 4104 4105 if (action == DAD_BEGIN) { 4106 addrconf_dad_begin(ifp); 4107 goto out; 4108 } else if (action == DAD_ABORT) { 4109 in6_ifa_hold(ifp); 4110 addrconf_dad_stop(ifp, 1); 4111 if (disable_ipv6) 4112 addrconf_ifdown(idev->dev, false); 4113 goto out; 4114 } 4115 4116 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 4117 goto out; 4118 4119 write_lock_bh(&idev->lock); 4120 if (idev->dead || !(idev->if_flags & IF_READY)) { 4121 write_unlock_bh(&idev->lock); 4122 goto out; 4123 } 4124 4125 spin_lock(&ifp->lock); 4126 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 4127 spin_unlock(&ifp->lock); 4128 write_unlock_bh(&idev->lock); 4129 goto out; 4130 } 4131 4132 if (ifp->dad_probes == 0) { 4133 bool send_na = false; 4134 4135 /* 4136 * DAD was successful 4137 */ 4138 4139 if (ifp->flags & IFA_F_TENTATIVE && 4140 !(ifp->flags & IFA_F_OPTIMISTIC)) 4141 send_na = true; 4142 bump_id = ifp->flags & IFA_F_TENTATIVE; 4143 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4144 spin_unlock(&ifp->lock); 4145 write_unlock_bh(&idev->lock); 4146 4147 addrconf_dad_completed(ifp, bump_id, send_na); 4148 4149 goto out; 4150 } 4151 4152 ifp->dad_probes--; 4153 addrconf_mod_dad_work(ifp, 4154 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), 4155 HZ/100)); 4156 spin_unlock(&ifp->lock); 4157 write_unlock_bh(&idev->lock); 4158 4159 /* send a neighbour solicitation for our addr */ 4160 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 4161 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 4162 ifp->dad_nonce); 4163out: 4164 in6_ifa_put(ifp); 4165 rtnl_unlock(); 4166} 4167 4168/* ifp->idev must be at least read locked */ 4169static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4170{ 4171 struct inet6_ifaddr *ifpiter; 4172 struct inet6_dev *idev = ifp->idev; 4173 4174 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4175 if (ifpiter->scope > IFA_LINK) 4176 break; 4177 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4178 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4179 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4180 IFA_F_PERMANENT) 4181 return false; 4182 } 4183 return true; 4184} 4185 4186static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 4187 bool send_na) 4188{ 4189 struct net_device *dev = ifp->idev->dev; 4190 struct in6_addr lladdr; 4191 bool send_rs, send_mld; 4192 4193 addrconf_del_dad_work(ifp); 4194 4195 /* 4196 * Configure the address for reception. Now it is valid. 4197 */ 4198 4199 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4200 4201 /* If added prefix is link local and we are prepared to process 4202 router advertisements, start sending router solicitations. 4203 */ 4204 4205 read_lock_bh(&ifp->idev->lock); 4206 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4207 send_rs = send_mld && 4208 ipv6_accept_ra(ifp->idev) && 4209 ifp->idev->cnf.rtr_solicits != 0 && 4210 (dev->flags & IFF_LOOPBACK) == 0 && 4211 (dev->type != ARPHRD_TUNNEL); 4212 read_unlock_bh(&ifp->idev->lock); 4213 4214 /* While dad is in progress mld report's source address is in6_addrany. 4215 * Resend with proper ll now. 4216 */ 4217 if (send_mld) 4218 ipv6_mc_dad_complete(ifp->idev); 4219 4220 /* send unsolicited NA if enabled */ 4221 if (send_na && 4222 (ifp->idev->cnf.ndisc_notify || 4223 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) { 4224 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr, 4225 /*router=*/ !!ifp->idev->cnf.forwarding, 4226 /*solicited=*/ false, /*override=*/ true, 4227 /*inc_opt=*/ true); 4228 } 4229 4230 if (send_rs) { 4231 /* 4232 * If a host as already performed a random delay 4233 * [...] as part of DAD [...] there is no need 4234 * to delay again before sending the first RS 4235 */ 4236 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4237 return; 4238 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4239 4240 write_lock_bh(&ifp->idev->lock); 4241 spin_lock(&ifp->lock); 4242 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4243 ifp->idev->cnf.rtr_solicit_interval); 4244 ifp->idev->rs_probes = 1; 4245 ifp->idev->if_flags |= IF_RS_SENT; 4246 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4247 spin_unlock(&ifp->lock); 4248 write_unlock_bh(&ifp->idev->lock); 4249 } 4250 4251 if (bump_id) 4252 rt_genid_bump_ipv6(dev_net(dev)); 4253 4254 /* Make sure that a new temporary address will be created 4255 * before this temporary address becomes deprecated. 4256 */ 4257 if (ifp->flags & IFA_F_TEMPORARY) 4258 addrconf_verify_rtnl(); 4259} 4260 4261static void addrconf_dad_run(struct inet6_dev *idev, bool restart) 4262{ 4263 struct inet6_ifaddr *ifp; 4264 4265 read_lock_bh(&idev->lock); 4266 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4267 spin_lock(&ifp->lock); 4268 if ((ifp->flags & IFA_F_TENTATIVE && 4269 ifp->state == INET6_IFADDR_STATE_DAD) || restart) { 4270 if (restart) 4271 ifp->state = INET6_IFADDR_STATE_PREDAD; 4272 addrconf_dad_kick(ifp); 4273 } 4274 spin_unlock(&ifp->lock); 4275 } 4276 read_unlock_bh(&idev->lock); 4277} 4278 4279#ifdef CONFIG_PROC_FS 4280struct if6_iter_state { 4281 struct seq_net_private p; 4282 int bucket; 4283 int offset; 4284}; 4285 4286static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4287{ 4288 struct if6_iter_state *state = seq->private; 4289 struct net *net = seq_file_net(seq); 4290 struct inet6_ifaddr *ifa = NULL; 4291 int p = 0; 4292 4293 /* initial bucket if pos is 0 */ 4294 if (pos == 0) { 4295 state->bucket = 0; 4296 state->offset = 0; 4297 } 4298 4299 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4300 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket], 4301 addr_lst) { 4302 if (!net_eq(dev_net(ifa->idev->dev), net)) 4303 continue; 4304 /* sync with offset */ 4305 if (p < state->offset) { 4306 p++; 4307 continue; 4308 } 4309 return ifa; 4310 } 4311 4312 /* prepare for next bucket */ 4313 state->offset = 0; 4314 p = 0; 4315 } 4316 return NULL; 4317} 4318 4319static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4320 struct inet6_ifaddr *ifa) 4321{ 4322 struct if6_iter_state *state = seq->private; 4323 struct net *net = seq_file_net(seq); 4324 4325 hlist_for_each_entry_continue_rcu(ifa, addr_lst) { 4326 if (!net_eq(dev_net(ifa->idev->dev), net)) 4327 continue; 4328 state->offset++; 4329 return ifa; 4330 } 4331 4332 state->offset = 0; 4333 while (++state->bucket < IN6_ADDR_HSIZE) { 4334 hlist_for_each_entry_rcu(ifa, 4335 &inet6_addr_lst[state->bucket], addr_lst) { 4336 if (!net_eq(dev_net(ifa->idev->dev), net)) 4337 continue; 4338 return ifa; 4339 } 4340 } 4341 4342 return NULL; 4343} 4344 4345static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4346 __acquires(rcu) 4347{ 4348 rcu_read_lock(); 4349 return if6_get_first(seq, *pos); 4350} 4351 4352static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4353{ 4354 struct inet6_ifaddr *ifa; 4355 4356 ifa = if6_get_next(seq, v); 4357 ++*pos; 4358 return ifa; 4359} 4360 4361static void if6_seq_stop(struct seq_file *seq, void *v) 4362 __releases(rcu) 4363{ 4364 rcu_read_unlock(); 4365} 4366 4367static int if6_seq_show(struct seq_file *seq, void *v) 4368{ 4369 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4370 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4371 &ifp->addr, 4372 ifp->idev->dev->ifindex, 4373 ifp->prefix_len, 4374 ifp->scope, 4375 (u8) ifp->flags, 4376 ifp->idev->dev->name); 4377 return 0; 4378} 4379 4380static const struct seq_operations if6_seq_ops = { 4381 .start = if6_seq_start, 4382 .next = if6_seq_next, 4383 .show = if6_seq_show, 4384 .stop = if6_seq_stop, 4385}; 4386 4387static int __net_init if6_proc_net_init(struct net *net) 4388{ 4389 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops, 4390 sizeof(struct if6_iter_state))) 4391 return -ENOMEM; 4392 return 0; 4393} 4394 4395static void __net_exit if6_proc_net_exit(struct net *net) 4396{ 4397 remove_proc_entry("if_inet6", net->proc_net); 4398} 4399 4400static struct pernet_operations if6_proc_net_ops = { 4401 .init = if6_proc_net_init, 4402 .exit = if6_proc_net_exit, 4403}; 4404 4405int __init if6_proc_init(void) 4406{ 4407 return register_pernet_subsys(&if6_proc_net_ops); 4408} 4409 4410void if6_proc_exit(void) 4411{ 4412 unregister_pernet_subsys(&if6_proc_net_ops); 4413} 4414#endif /* CONFIG_PROC_FS */ 4415 4416#if IS_ENABLED(CONFIG_IPV6_MIP6) 4417/* Check if address is a home address configured on any interface. */ 4418int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4419{ 4420 unsigned int hash = inet6_addr_hash(net, addr); 4421 struct inet6_ifaddr *ifp = NULL; 4422 int ret = 0; 4423 4424 rcu_read_lock(); 4425 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 4426 if (!net_eq(dev_net(ifp->idev->dev), net)) 4427 continue; 4428 if (ipv6_addr_equal(&ifp->addr, addr) && 4429 (ifp->flags & IFA_F_HOMEADDRESS)) { 4430 ret = 1; 4431 break; 4432 } 4433 } 4434 rcu_read_unlock(); 4435 return ret; 4436} 4437#endif 4438 4439/* RFC6554 has some algorithm to avoid loops in segment routing by 4440 * checking if the segments contains any of a local interface address. 4441 * 4442 * Quote: 4443 * 4444 * To detect loops in the SRH, a router MUST determine if the SRH 4445 * includes multiple addresses assigned to any interface on that router. 4446 * If such addresses appear more than once and are separated by at least 4447 * one address not assigned to that router. 4448 */ 4449int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs, 4450 unsigned char nsegs) 4451{ 4452 const struct in6_addr *addr; 4453 int i, ret = 0, found = 0; 4454 struct inet6_ifaddr *ifp; 4455 bool separated = false; 4456 unsigned int hash; 4457 bool hash_found; 4458 4459 rcu_read_lock(); 4460 for (i = 0; i < nsegs; i++) { 4461 addr = &segs[i]; 4462 hash = inet6_addr_hash(net, addr); 4463 4464 hash_found = false; 4465 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 4466 if (!net_eq(dev_net(ifp->idev->dev), net)) 4467 continue; 4468 4469 if (ipv6_addr_equal(&ifp->addr, addr)) { 4470 hash_found = true; 4471 break; 4472 } 4473 } 4474 4475 if (hash_found) { 4476 if (found > 1 && separated) { 4477 ret = 1; 4478 break; 4479 } 4480 4481 separated = false; 4482 found++; 4483 } else { 4484 separated = true; 4485 } 4486 } 4487 rcu_read_unlock(); 4488 4489 return ret; 4490} 4491 4492/* 4493 * Periodic address status verification 4494 */ 4495 4496static void addrconf_verify_rtnl(void) 4497{ 4498 unsigned long now, next, next_sec, next_sched; 4499 struct inet6_ifaddr *ifp; 4500 int i; 4501 4502 ASSERT_RTNL(); 4503 4504 rcu_read_lock_bh(); 4505 now = jiffies; 4506 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4507 4508 cancel_delayed_work(&addr_chk_work); 4509 4510 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4511restart: 4512 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4513 unsigned long age; 4514 4515 /* When setting preferred_lft to a value not zero or 4516 * infinity, while valid_lft is infinity 4517 * IFA_F_PERMANENT has a non-infinity life time. 4518 */ 4519 if ((ifp->flags & IFA_F_PERMANENT) && 4520 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4521 continue; 4522 4523 spin_lock(&ifp->lock); 4524 /* We try to batch several events at once. */ 4525 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4526 4527 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4528 age >= ifp->valid_lft) { 4529 spin_unlock(&ifp->lock); 4530 in6_ifa_hold(ifp); 4531 ipv6_del_addr(ifp); 4532 goto restart; 4533 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4534 spin_unlock(&ifp->lock); 4535 continue; 4536 } else if (age >= ifp->prefered_lft) { 4537 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4538 int deprecate = 0; 4539 4540 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4541 deprecate = 1; 4542 ifp->flags |= IFA_F_DEPRECATED; 4543 } 4544 4545 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4546 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4547 next = ifp->tstamp + ifp->valid_lft * HZ; 4548 4549 spin_unlock(&ifp->lock); 4550 4551 if (deprecate) { 4552 in6_ifa_hold(ifp); 4553 4554 ipv6_ifa_notify(0, ifp); 4555 in6_ifa_put(ifp); 4556 goto restart; 4557 } 4558 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4559 !(ifp->flags&IFA_F_TENTATIVE)) { 4560 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4561 ifp->idev->cnf.dad_transmits * 4562 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 4563 4564 if (age >= ifp->prefered_lft - regen_advance) { 4565 struct inet6_ifaddr *ifpub = ifp->ifpub; 4566 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4567 next = ifp->tstamp + ifp->prefered_lft * HZ; 4568 if (!ifp->regen_count && ifpub) { 4569 ifp->regen_count++; 4570 in6_ifa_hold(ifp); 4571 in6_ifa_hold(ifpub); 4572 spin_unlock(&ifp->lock); 4573 4574 spin_lock(&ifpub->lock); 4575 ifpub->regen_count = 0; 4576 spin_unlock(&ifpub->lock); 4577 rcu_read_unlock_bh(); 4578 ipv6_create_tempaddr(ifpub, true); 4579 in6_ifa_put(ifpub); 4580 in6_ifa_put(ifp); 4581 rcu_read_lock_bh(); 4582 goto restart; 4583 } 4584 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4585 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4586 spin_unlock(&ifp->lock); 4587 } else { 4588 /* ifp->prefered_lft <= ifp->valid_lft */ 4589 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4590 next = ifp->tstamp + ifp->prefered_lft * HZ; 4591 spin_unlock(&ifp->lock); 4592 } 4593 } 4594 } 4595 4596 next_sec = round_jiffies_up(next); 4597 next_sched = next; 4598 4599 /* If rounded timeout is accurate enough, accept it. */ 4600 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4601 next_sched = next_sec; 4602 4603 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4604 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4605 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4606 4607 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4608 now, next, next_sec, next_sched); 4609 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4610 rcu_read_unlock_bh(); 4611} 4612 4613static void addrconf_verify_work(struct work_struct *w) 4614{ 4615 rtnl_lock(); 4616 addrconf_verify_rtnl(); 4617 rtnl_unlock(); 4618} 4619 4620static void addrconf_verify(void) 4621{ 4622 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4623} 4624 4625static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4626 struct in6_addr **peer_pfx) 4627{ 4628 struct in6_addr *pfx = NULL; 4629 4630 *peer_pfx = NULL; 4631 4632 if (addr) 4633 pfx = nla_data(addr); 4634 4635 if (local) { 4636 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4637 *peer_pfx = pfx; 4638 pfx = nla_data(local); 4639 } 4640 4641 return pfx; 4642} 4643 4644static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4645 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4646 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4647 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4648 [IFA_FLAGS] = { .len = sizeof(u32) }, 4649 [IFA_RT_PRIORITY] = { .len = sizeof(u32) }, 4650 [IFA_TARGET_NETNSID] = { .type = NLA_S32 }, 4651}; 4652 4653static int 4654inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4655 struct netlink_ext_ack *extack) 4656{ 4657 struct net *net = sock_net(skb->sk); 4658 struct ifaddrmsg *ifm; 4659 struct nlattr *tb[IFA_MAX+1]; 4660 struct in6_addr *pfx, *peer_pfx; 4661 u32 ifa_flags; 4662 int err; 4663 4664 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4665 ifa_ipv6_policy, extack); 4666 if (err < 0) 4667 return err; 4668 4669 ifm = nlmsg_data(nlh); 4670 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4671 if (!pfx) 4672 return -EINVAL; 4673 4674 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4675 4676 /* We ignore other flags so far. */ 4677 ifa_flags &= IFA_F_MANAGETEMPADDR; 4678 4679 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4680 ifm->ifa_prefixlen); 4681} 4682 4683static int modify_prefix_route(struct inet6_ifaddr *ifp, 4684 unsigned long expires, u32 flags, 4685 bool modify_peer) 4686{ 4687 struct fib6_info *f6i; 4688 u32 prio; 4689 4690 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4691 ifp->prefix_len, 4692 ifp->idev->dev, 0, RTF_DEFAULT, true); 4693 if (!f6i) 4694 return -ENOENT; 4695 4696 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF; 4697 if (f6i->fib6_metric != prio) { 4698 /* delete old one */ 4699 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 4700 4701 /* add new one */ 4702 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4703 ifp->prefix_len, 4704 ifp->rt_priority, ifp->idev->dev, 4705 expires, flags, GFP_KERNEL); 4706 } else { 4707 if (!expires) 4708 fib6_clean_expires(f6i); 4709 else 4710 fib6_set_expires(f6i, expires); 4711 4712 fib6_info_release(f6i); 4713 } 4714 4715 return 0; 4716} 4717 4718static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg) 4719{ 4720 u32 flags; 4721 clock_t expires; 4722 unsigned long timeout; 4723 bool was_managetempaddr; 4724 bool had_prefixroute; 4725 bool new_peer = false; 4726 4727 ASSERT_RTNL(); 4728 4729 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 4730 return -EINVAL; 4731 4732 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && 4733 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4734 return -EINVAL; 4735 4736 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED) 4737 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC; 4738 4739 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 4740 if (addrconf_finite_timeout(timeout)) { 4741 expires = jiffies_to_clock_t(timeout * HZ); 4742 cfg->valid_lft = timeout; 4743 flags = RTF_EXPIRES; 4744 } else { 4745 expires = 0; 4746 flags = 0; 4747 cfg->ifa_flags |= IFA_F_PERMANENT; 4748 } 4749 4750 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 4751 if (addrconf_finite_timeout(timeout)) { 4752 if (timeout == 0) 4753 cfg->ifa_flags |= IFA_F_DEPRECATED; 4754 cfg->preferred_lft = timeout; 4755 } 4756 4757 if (cfg->peer_pfx && 4758 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) { 4759 if (!ipv6_addr_any(&ifp->peer_addr)) 4760 cleanup_prefix_route(ifp, expires, true, true); 4761 new_peer = true; 4762 } 4763 4764 spin_lock_bh(&ifp->lock); 4765 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4766 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4767 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4768 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4769 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4770 IFA_F_NOPREFIXROUTE); 4771 ifp->flags |= cfg->ifa_flags; 4772 ifp->tstamp = jiffies; 4773 ifp->valid_lft = cfg->valid_lft; 4774 ifp->prefered_lft = cfg->preferred_lft; 4775 4776 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority) 4777 ifp->rt_priority = cfg->rt_priority; 4778 4779 if (new_peer) 4780 ifp->peer_addr = *cfg->peer_pfx; 4781 4782 spin_unlock_bh(&ifp->lock); 4783 if (!(ifp->flags&IFA_F_TENTATIVE)) 4784 ipv6_ifa_notify(0, ifp); 4785 4786 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 4787 int rc = -ENOENT; 4788 4789 if (had_prefixroute) 4790 rc = modify_prefix_route(ifp, expires, flags, false); 4791 4792 /* prefix route could have been deleted; if so restore it */ 4793 if (rc == -ENOENT) { 4794 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4795 ifp->rt_priority, ifp->idev->dev, 4796 expires, flags, GFP_KERNEL); 4797 } 4798 4799 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr)) 4800 rc = modify_prefix_route(ifp, expires, flags, true); 4801 4802 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) { 4803 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len, 4804 ifp->rt_priority, ifp->idev->dev, 4805 expires, flags, GFP_KERNEL); 4806 } 4807 } else if (had_prefixroute) { 4808 enum cleanup_prefix_rt_t action; 4809 unsigned long rt_expires; 4810 4811 write_lock_bh(&ifp->idev->lock); 4812 action = check_cleanup_prefix_route(ifp, &rt_expires); 4813 write_unlock_bh(&ifp->idev->lock); 4814 4815 if (action != CLEANUP_PREFIX_RT_NOP) { 4816 cleanup_prefix_route(ifp, rt_expires, 4817 action == CLEANUP_PREFIX_RT_DEL, false); 4818 } 4819 } 4820 4821 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4822 if (was_managetempaddr && 4823 !(ifp->flags & IFA_F_MANAGETEMPADDR)) { 4824 cfg->valid_lft = 0; 4825 cfg->preferred_lft = 0; 4826 } 4827 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft, 4828 cfg->preferred_lft, !was_managetempaddr, 4829 jiffies); 4830 } 4831 4832 addrconf_verify_rtnl(); 4833 4834 return 0; 4835} 4836 4837static int 4838inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4839 struct netlink_ext_ack *extack) 4840{ 4841 struct net *net = sock_net(skb->sk); 4842 struct ifaddrmsg *ifm; 4843 struct nlattr *tb[IFA_MAX+1]; 4844 struct in6_addr *peer_pfx; 4845 struct inet6_ifaddr *ifa; 4846 struct net_device *dev; 4847 struct inet6_dev *idev; 4848 struct ifa6_config cfg; 4849 int err; 4850 4851 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4852 ifa_ipv6_policy, extack); 4853 if (err < 0) 4854 return err; 4855 4856 memset(&cfg, 0, sizeof(cfg)); 4857 4858 ifm = nlmsg_data(nlh); 4859 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4860 if (!cfg.pfx) 4861 return -EINVAL; 4862 4863 cfg.peer_pfx = peer_pfx; 4864 cfg.plen = ifm->ifa_prefixlen; 4865 if (tb[IFA_RT_PRIORITY]) 4866 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]); 4867 4868 cfg.valid_lft = INFINITY_LIFE_TIME; 4869 cfg.preferred_lft = INFINITY_LIFE_TIME; 4870 4871 if (tb[IFA_CACHEINFO]) { 4872 struct ifa_cacheinfo *ci; 4873 4874 ci = nla_data(tb[IFA_CACHEINFO]); 4875 cfg.valid_lft = ci->ifa_valid; 4876 cfg.preferred_lft = ci->ifa_prefered; 4877 } 4878 4879 dev = __dev_get_by_index(net, ifm->ifa_index); 4880 if (!dev) 4881 return -ENODEV; 4882 4883 if (tb[IFA_FLAGS]) 4884 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]); 4885 else 4886 cfg.ifa_flags = ifm->ifa_flags; 4887 4888 /* We ignore other flags so far. */ 4889 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | 4890 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE | 4891 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC; 4892 4893 idev = ipv6_find_idev(dev); 4894 if (IS_ERR(idev)) 4895 return PTR_ERR(idev); 4896 4897 if (!ipv6_allow_optimistic_dad(net, idev)) 4898 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC; 4899 4900 if (cfg.ifa_flags & IFA_F_NODAD && 4901 cfg.ifa_flags & IFA_F_OPTIMISTIC) { 4902 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive"); 4903 return -EINVAL; 4904 } 4905 4906 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1); 4907 if (!ifa) { 4908 /* 4909 * It would be best to check for !NLM_F_CREATE here but 4910 * userspace already relies on not having to provide this. 4911 */ 4912 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack); 4913 } 4914 4915 if (nlh->nlmsg_flags & NLM_F_EXCL || 4916 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4917 err = -EEXIST; 4918 else 4919 err = inet6_addr_modify(ifa, &cfg); 4920 4921 in6_ifa_put(ifa); 4922 4923 return err; 4924} 4925 4926static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4927 u8 scope, int ifindex) 4928{ 4929 struct ifaddrmsg *ifm; 4930 4931 ifm = nlmsg_data(nlh); 4932 ifm->ifa_family = AF_INET6; 4933 ifm->ifa_prefixlen = prefixlen; 4934 ifm->ifa_flags = flags; 4935 ifm->ifa_scope = scope; 4936 ifm->ifa_index = ifindex; 4937} 4938 4939static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4940 unsigned long tstamp, u32 preferred, u32 valid) 4941{ 4942 struct ifa_cacheinfo ci; 4943 4944 ci.cstamp = cstamp_delta(cstamp); 4945 ci.tstamp = cstamp_delta(tstamp); 4946 ci.ifa_prefered = preferred; 4947 ci.ifa_valid = valid; 4948 4949 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4950} 4951 4952static inline int rt_scope(int ifa_scope) 4953{ 4954 if (ifa_scope & IFA_HOST) 4955 return RT_SCOPE_HOST; 4956 else if (ifa_scope & IFA_LINK) 4957 return RT_SCOPE_LINK; 4958 else if (ifa_scope & IFA_SITE) 4959 return RT_SCOPE_SITE; 4960 else 4961 return RT_SCOPE_UNIVERSE; 4962} 4963 4964static inline int inet6_ifaddr_msgsize(void) 4965{ 4966 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4967 + nla_total_size(16) /* IFA_LOCAL */ 4968 + nla_total_size(16) /* IFA_ADDRESS */ 4969 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4970 + nla_total_size(4) /* IFA_FLAGS */ 4971 + nla_total_size(4) /* IFA_RT_PRIORITY */; 4972} 4973 4974enum addr_type_t { 4975 UNICAST_ADDR, 4976 MULTICAST_ADDR, 4977 ANYCAST_ADDR, 4978}; 4979 4980struct inet6_fill_args { 4981 u32 portid; 4982 u32 seq; 4983 int event; 4984 unsigned int flags; 4985 int netnsid; 4986 int ifindex; 4987 enum addr_type_t type; 4988}; 4989 4990static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4991 struct inet6_fill_args *args) 4992{ 4993 struct nlmsghdr *nlh; 4994 u32 preferred, valid; 4995 4996 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 4997 sizeof(struct ifaddrmsg), args->flags); 4998 if (!nlh) 4999 return -EMSGSIZE; 5000 5001 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 5002 ifa->idev->dev->ifindex); 5003 5004 if (args->netnsid >= 0 && 5005 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 5006 goto error; 5007 5008 spin_lock_bh(&ifa->lock); 5009 if (!((ifa->flags&IFA_F_PERMANENT) && 5010 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 5011 preferred = ifa->prefered_lft; 5012 valid = ifa->valid_lft; 5013 if (preferred != INFINITY_LIFE_TIME) { 5014 long tval = (jiffies - ifa->tstamp)/HZ; 5015 if (preferred > tval) 5016 preferred -= tval; 5017 else 5018 preferred = 0; 5019 if (valid != INFINITY_LIFE_TIME) { 5020 if (valid > tval) 5021 valid -= tval; 5022 else 5023 valid = 0; 5024 } 5025 } 5026 } else { 5027 preferred = INFINITY_LIFE_TIME; 5028 valid = INFINITY_LIFE_TIME; 5029 } 5030 spin_unlock_bh(&ifa->lock); 5031 5032 if (!ipv6_addr_any(&ifa->peer_addr)) { 5033 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 5034 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 5035 goto error; 5036 } else 5037 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 5038 goto error; 5039 5040 if (ifa->rt_priority && 5041 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority)) 5042 goto error; 5043 5044 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 5045 goto error; 5046 5047 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 5048 goto error; 5049 5050 nlmsg_end(skb, nlh); 5051 return 0; 5052 5053error: 5054 nlmsg_cancel(skb, nlh); 5055 return -EMSGSIZE; 5056} 5057 5058static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 5059 struct inet6_fill_args *args) 5060{ 5061 struct nlmsghdr *nlh; 5062 u8 scope = RT_SCOPE_UNIVERSE; 5063 int ifindex = ifmca->idev->dev->ifindex; 5064 5065 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 5066 scope = RT_SCOPE_SITE; 5067 5068 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5069 sizeof(struct ifaddrmsg), args->flags); 5070 if (!nlh) 5071 return -EMSGSIZE; 5072 5073 if (args->netnsid >= 0 && 5074 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5075 nlmsg_cancel(skb, nlh); 5076 return -EMSGSIZE; 5077 } 5078 5079 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5080 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 5081 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 5082 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5083 nlmsg_cancel(skb, nlh); 5084 return -EMSGSIZE; 5085 } 5086 5087 nlmsg_end(skb, nlh); 5088 return 0; 5089} 5090 5091static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 5092 struct inet6_fill_args *args) 5093{ 5094 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt); 5095 int ifindex = dev ? dev->ifindex : 1; 5096 struct nlmsghdr *nlh; 5097 u8 scope = RT_SCOPE_UNIVERSE; 5098 5099 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 5100 scope = RT_SCOPE_SITE; 5101 5102 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5103 sizeof(struct ifaddrmsg), args->flags); 5104 if (!nlh) 5105 return -EMSGSIZE; 5106 5107 if (args->netnsid >= 0 && 5108 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5109 nlmsg_cancel(skb, nlh); 5110 return -EMSGSIZE; 5111 } 5112 5113 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5114 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 5115 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 5116 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5117 nlmsg_cancel(skb, nlh); 5118 return -EMSGSIZE; 5119 } 5120 5121 nlmsg_end(skb, nlh); 5122 return 0; 5123} 5124 5125/* called with rcu_read_lock() */ 5126static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 5127 struct netlink_callback *cb, int s_ip_idx, 5128 struct inet6_fill_args *fillargs) 5129{ 5130 struct ifmcaddr6 *ifmca; 5131 struct ifacaddr6 *ifaca; 5132 int ip_idx = 0; 5133 int err = 1; 5134 5135 read_lock_bh(&idev->lock); 5136 switch (fillargs->type) { 5137 case UNICAST_ADDR: { 5138 struct inet6_ifaddr *ifa; 5139 fillargs->event = RTM_NEWADDR; 5140 5141 /* unicast address incl. temp addr */ 5142 list_for_each_entry(ifa, &idev->addr_list, if_list) { 5143 if (ip_idx < s_ip_idx) 5144 goto next; 5145 err = inet6_fill_ifaddr(skb, ifa, fillargs); 5146 if (err < 0) 5147 break; 5148 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 5149next: 5150 ip_idx++; 5151 } 5152 break; 5153 } 5154 case MULTICAST_ADDR: 5155 fillargs->event = RTM_GETMULTICAST; 5156 5157 /* multicast address */ 5158 for (ifmca = idev->mc_list; ifmca; 5159 ifmca = ifmca->next, ip_idx++) { 5160 if (ip_idx < s_ip_idx) 5161 continue; 5162 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs); 5163 if (err < 0) 5164 break; 5165 } 5166 break; 5167 case ANYCAST_ADDR: 5168 fillargs->event = RTM_GETANYCAST; 5169 /* anycast address */ 5170 for (ifaca = idev->ac_list; ifaca; 5171 ifaca = ifaca->aca_next, ip_idx++) { 5172 if (ip_idx < s_ip_idx) 5173 continue; 5174 err = inet6_fill_ifacaddr(skb, ifaca, fillargs); 5175 if (err < 0) 5176 break; 5177 } 5178 break; 5179 default: 5180 break; 5181 } 5182 read_unlock_bh(&idev->lock); 5183 cb->args[2] = ip_idx; 5184 return err; 5185} 5186 5187static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh, 5188 struct inet6_fill_args *fillargs, 5189 struct net **tgt_net, struct sock *sk, 5190 struct netlink_callback *cb) 5191{ 5192 struct netlink_ext_ack *extack = cb->extack; 5193 struct nlattr *tb[IFA_MAX+1]; 5194 struct ifaddrmsg *ifm; 5195 int err, i; 5196 5197 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5198 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request"); 5199 return -EINVAL; 5200 } 5201 5202 ifm = nlmsg_data(nlh); 5203 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5204 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request"); 5205 return -EINVAL; 5206 } 5207 5208 fillargs->ifindex = ifm->ifa_index; 5209 if (fillargs->ifindex) { 5210 cb->answer_flags |= NLM_F_DUMP_FILTERED; 5211 fillargs->flags |= NLM_F_DUMP_FILTERED; 5212 } 5213 5214 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5215 ifa_ipv6_policy, extack); 5216 if (err < 0) 5217 return err; 5218 5219 for (i = 0; i <= IFA_MAX; ++i) { 5220 if (!tb[i]) 5221 continue; 5222 5223 if (i == IFA_TARGET_NETNSID) { 5224 struct net *net; 5225 5226 fillargs->netnsid = nla_get_s32(tb[i]); 5227 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid); 5228 if (IS_ERR(net)) { 5229 fillargs->netnsid = -1; 5230 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id"); 5231 return PTR_ERR(net); 5232 } 5233 *tgt_net = net; 5234 } else { 5235 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); 5236 return -EINVAL; 5237 } 5238 } 5239 5240 return 0; 5241} 5242 5243static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 5244 enum addr_type_t type) 5245{ 5246 const struct nlmsghdr *nlh = cb->nlh; 5247 struct inet6_fill_args fillargs = { 5248 .portid = NETLINK_CB(cb->skb).portid, 5249 .seq = cb->nlh->nlmsg_seq, 5250 .flags = NLM_F_MULTI, 5251 .netnsid = -1, 5252 .type = type, 5253 }; 5254 struct net *net = sock_net(skb->sk); 5255 struct net *tgt_net = net; 5256 int idx, s_idx, s_ip_idx; 5257 int h, s_h; 5258 struct net_device *dev; 5259 struct inet6_dev *idev; 5260 struct hlist_head *head; 5261 int err = 0; 5262 5263 s_h = cb->args[0]; 5264 s_idx = idx = cb->args[1]; 5265 s_ip_idx = cb->args[2]; 5266 5267 if (cb->strict_check) { 5268 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net, 5269 skb->sk, cb); 5270 if (err < 0) 5271 goto put_tgt_net; 5272 5273 err = 0; 5274 if (fillargs.ifindex) { 5275 dev = __dev_get_by_index(tgt_net, fillargs.ifindex); 5276 if (!dev) { 5277 err = -ENODEV; 5278 goto put_tgt_net; 5279 } 5280 idev = __in6_dev_get(dev); 5281 if (idev) { 5282 err = in6_dump_addrs(idev, skb, cb, s_ip_idx, 5283 &fillargs); 5284 if (err > 0) 5285 err = 0; 5286 } 5287 goto put_tgt_net; 5288 } 5289 } 5290 5291 rcu_read_lock(); 5292 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq; 5293 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5294 idx = 0; 5295 head = &tgt_net->dev_index_head[h]; 5296 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5297 if (idx < s_idx) 5298 goto cont; 5299 if (h > s_h || idx > s_idx) 5300 s_ip_idx = 0; 5301 idev = __in6_dev_get(dev); 5302 if (!idev) 5303 goto cont; 5304 5305 if (in6_dump_addrs(idev, skb, cb, s_ip_idx, 5306 &fillargs) < 0) 5307 goto done; 5308cont: 5309 idx++; 5310 } 5311 } 5312done: 5313 rcu_read_unlock(); 5314 cb->args[0] = h; 5315 cb->args[1] = idx; 5316put_tgt_net: 5317 if (fillargs.netnsid >= 0) 5318 put_net(tgt_net); 5319 5320 return skb->len ? : err; 5321} 5322 5323static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 5324{ 5325 enum addr_type_t type = UNICAST_ADDR; 5326 5327 return inet6_dump_addr(skb, cb, type); 5328} 5329 5330static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 5331{ 5332 enum addr_type_t type = MULTICAST_ADDR; 5333 5334 return inet6_dump_addr(skb, cb, type); 5335} 5336 5337 5338static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 5339{ 5340 enum addr_type_t type = ANYCAST_ADDR; 5341 5342 return inet6_dump_addr(skb, cb, type); 5343} 5344 5345static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb, 5346 const struct nlmsghdr *nlh, 5347 struct nlattr **tb, 5348 struct netlink_ext_ack *extack) 5349{ 5350 struct ifaddrmsg *ifm; 5351 int i, err; 5352 5353 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5354 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request"); 5355 return -EINVAL; 5356 } 5357 5358 if (!netlink_strict_get_check(skb)) 5359 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 5360 ifa_ipv6_policy, extack); 5361 5362 ifm = nlmsg_data(nlh); 5363 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5364 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request"); 5365 return -EINVAL; 5366 } 5367 5368 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5369 ifa_ipv6_policy, extack); 5370 if (err) 5371 return err; 5372 5373 for (i = 0; i <= IFA_MAX; i++) { 5374 if (!tb[i]) 5375 continue; 5376 5377 switch (i) { 5378 case IFA_TARGET_NETNSID: 5379 case IFA_ADDRESS: 5380 case IFA_LOCAL: 5381 break; 5382 default: 5383 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request"); 5384 return -EINVAL; 5385 } 5386 } 5387 5388 return 0; 5389} 5390 5391static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 5392 struct netlink_ext_ack *extack) 5393{ 5394 struct net *net = sock_net(in_skb->sk); 5395 struct inet6_fill_args fillargs = { 5396 .portid = NETLINK_CB(in_skb).portid, 5397 .seq = nlh->nlmsg_seq, 5398 .event = RTM_NEWADDR, 5399 .flags = 0, 5400 .netnsid = -1, 5401 }; 5402 struct net *tgt_net = net; 5403 struct ifaddrmsg *ifm; 5404 struct nlattr *tb[IFA_MAX+1]; 5405 struct in6_addr *addr = NULL, *peer; 5406 struct net_device *dev = NULL; 5407 struct inet6_ifaddr *ifa; 5408 struct sk_buff *skb; 5409 int err; 5410 5411 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack); 5412 if (err < 0) 5413 return err; 5414 5415 if (tb[IFA_TARGET_NETNSID]) { 5416 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]); 5417 5418 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk, 5419 fillargs.netnsid); 5420 if (IS_ERR(tgt_net)) 5421 return PTR_ERR(tgt_net); 5422 } 5423 5424 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 5425 if (!addr) { 5426 err = -EINVAL; 5427 goto errout; 5428 } 5429 ifm = nlmsg_data(nlh); 5430 if (ifm->ifa_index) 5431 dev = dev_get_by_index(tgt_net, ifm->ifa_index); 5432 5433 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1); 5434 if (!ifa) { 5435 err = -EADDRNOTAVAIL; 5436 goto errout; 5437 } 5438 5439 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 5440 if (!skb) { 5441 err = -ENOBUFS; 5442 goto errout_ifa; 5443 } 5444 5445 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5446 if (err < 0) { 5447 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5448 WARN_ON(err == -EMSGSIZE); 5449 kfree_skb(skb); 5450 goto errout_ifa; 5451 } 5452 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid); 5453errout_ifa: 5454 in6_ifa_put(ifa); 5455errout: 5456 if (dev) 5457 dev_put(dev); 5458 if (fillargs.netnsid >= 0) 5459 put_net(tgt_net); 5460 5461 return err; 5462} 5463 5464static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 5465{ 5466 struct sk_buff *skb; 5467 struct net *net = dev_net(ifa->idev->dev); 5468 struct inet6_fill_args fillargs = { 5469 .portid = 0, 5470 .seq = 0, 5471 .event = event, 5472 .flags = 0, 5473 .netnsid = -1, 5474 }; 5475 int err = -ENOBUFS; 5476 5477 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 5478 if (!skb) 5479 goto errout; 5480 5481 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5482 if (err < 0) { 5483 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5484 WARN_ON(err == -EMSGSIZE); 5485 kfree_skb(skb); 5486 goto errout; 5487 } 5488 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 5489 return; 5490errout: 5491 if (err < 0) 5492 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 5493} 5494 5495static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 5496 __s32 *array, int bytes) 5497{ 5498 BUG_ON(bytes < (DEVCONF_MAX * 4)); 5499 5500 memset(array, 0, bytes); 5501 array[DEVCONF_FORWARDING] = cnf->forwarding; 5502 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 5503 array[DEVCONF_MTU6] = cnf->mtu6; 5504 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 5505 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 5506 array[DEVCONF_AUTOCONF] = cnf->autoconf; 5507 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 5508 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 5509 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5510 jiffies_to_msecs(cnf->rtr_solicit_interval); 5511 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5512 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 5513 array[DEVCONF_RTR_SOLICIT_DELAY] = 5514 jiffies_to_msecs(cnf->rtr_solicit_delay); 5515 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 5516 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5517 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 5518 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5519 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 5520 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 5521 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 5522 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 5523 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 5524 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 5525 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 5526 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 5527 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 5528 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 5529#ifdef CONFIG_IPV6_ROUTER_PREF 5530 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 5531 array[DEVCONF_RTR_PROBE_INTERVAL] = 5532 jiffies_to_msecs(cnf->rtr_probe_interval); 5533#ifdef CONFIG_IPV6_ROUTE_INFO 5534 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen; 5535 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 5536#endif 5537#endif 5538 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 5539 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 5540#ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5541 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 5542 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 5543#endif 5544#ifdef CONFIG_IPV6_MROUTE 5545 array[DEVCONF_MC_FORWARDING] = atomic_read(&cnf->mc_forwarding); 5546#endif 5547 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 5548 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 5549 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 5550 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 5551 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 5552 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 5553 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 5554 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 5555 /* we omit DEVCONF_STABLE_SECRET for now */ 5556 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 5557 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 5558 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 5559 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5560 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5561#ifdef CONFIG_IPV6_SEG6_HMAC 5562 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5563#endif 5564 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5565 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5566 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy; 5567 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass; 5568 array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled; 5569 array[DEVCONF_ACCEPT_RA_MIN_LFT] = cnf->accept_ra_min_lft; 5570} 5571 5572static inline size_t inet6_ifla6_size(void) 5573{ 5574 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5575 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5576 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5577 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5578 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5579 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */ 5580 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */ 5581 + 0; 5582} 5583 5584static inline size_t inet6_if_nlmsg_size(void) 5585{ 5586 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5587 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5588 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5589 + nla_total_size(4) /* IFLA_MTU */ 5590 + nla_total_size(4) /* IFLA_LINK */ 5591 + nla_total_size(1) /* IFLA_OPERSTATE */ 5592 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5593} 5594 5595static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5596 int bytes) 5597{ 5598 int i; 5599 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5600 BUG_ON(pad < 0); 5601 5602 /* Use put_unaligned() because stats may not be aligned for u64. */ 5603 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5604 for (i = 1; i < ICMP6_MIB_MAX; i++) 5605 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5606 5607 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5608} 5609 5610static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5611 int bytes, size_t syncpoff) 5612{ 5613 int i, c; 5614 u64 buff[IPSTATS_MIB_MAX]; 5615 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5616 5617 BUG_ON(pad < 0); 5618 5619 memset(buff, 0, sizeof(buff)); 5620 buff[0] = IPSTATS_MIB_MAX; 5621 5622 for_each_possible_cpu(c) { 5623 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5624 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5625 } 5626 5627 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5628 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5629} 5630 5631static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5632 int bytes) 5633{ 5634 switch (attrtype) { 5635 case IFLA_INET6_STATS: 5636 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5637 offsetof(struct ipstats_mib, syncp)); 5638 break; 5639 case IFLA_INET6_ICMP6STATS: 5640 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5641 break; 5642 } 5643} 5644 5645static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5646 u32 ext_filter_mask) 5647{ 5648 struct nlattr *nla; 5649 struct ifla_cacheinfo ci; 5650 5651 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5652 goto nla_put_failure; 5653 ci.max_reasm_len = IPV6_MAXPLEN; 5654 ci.tstamp = cstamp_delta(idev->tstamp); 5655 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5656 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5657 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5658 goto nla_put_failure; 5659 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5660 if (!nla) 5661 goto nla_put_failure; 5662 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5663 5664 /* XXX - MC not implemented */ 5665 5666 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5667 return 0; 5668 5669 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5670 if (!nla) 5671 goto nla_put_failure; 5672 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5673 5674 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5675 if (!nla) 5676 goto nla_put_failure; 5677 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5678 5679 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5680 if (!nla) 5681 goto nla_put_failure; 5682 read_lock_bh(&idev->lock); 5683 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5684 read_unlock_bh(&idev->lock); 5685 5686 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5687 goto nla_put_failure; 5688 5689 return 0; 5690 5691nla_put_failure: 5692 return -EMSGSIZE; 5693} 5694 5695static size_t inet6_get_link_af_size(const struct net_device *dev, 5696 u32 ext_filter_mask) 5697{ 5698 if (!__in6_dev_get(dev)) 5699 return 0; 5700 5701 return inet6_ifla6_size(); 5702} 5703 5704static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5705 u32 ext_filter_mask) 5706{ 5707 struct inet6_dev *idev = __in6_dev_get(dev); 5708 5709 if (!idev) 5710 return -ENODATA; 5711 5712 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5713 return -EMSGSIZE; 5714 5715 return 0; 5716} 5717 5718static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 5719{ 5720 struct inet6_ifaddr *ifp; 5721 struct net_device *dev = idev->dev; 5722 bool clear_token, update_rs = false; 5723 struct in6_addr ll_addr; 5724 5725 ASSERT_RTNL(); 5726 5727 if (!token) 5728 return -EINVAL; 5729 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 5730 return -EINVAL; 5731 if (!ipv6_accept_ra(idev)) 5732 return -EINVAL; 5733 if (idev->cnf.rtr_solicits == 0) 5734 return -EINVAL; 5735 5736 write_lock_bh(&idev->lock); 5737 5738 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5739 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5740 5741 write_unlock_bh(&idev->lock); 5742 5743 clear_token = ipv6_addr_any(token); 5744 if (clear_token) 5745 goto update_lft; 5746 5747 if (!idev->dead && (idev->if_flags & IF_READY) && 5748 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5749 IFA_F_OPTIMISTIC)) { 5750 /* If we're not ready, then normal ifup will take care 5751 * of this. Otherwise, we need to request our rs here. 5752 */ 5753 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5754 update_rs = true; 5755 } 5756 5757update_lft: 5758 write_lock_bh(&idev->lock); 5759 5760 if (update_rs) { 5761 idev->if_flags |= IF_RS_SENT; 5762 idev->rs_interval = rfc3315_s14_backoff_init( 5763 idev->cnf.rtr_solicit_interval); 5764 idev->rs_probes = 1; 5765 addrconf_mod_rs_timer(idev, idev->rs_interval); 5766 } 5767 5768 /* Well, that's kinda nasty ... */ 5769 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5770 spin_lock(&ifp->lock); 5771 if (ifp->tokenized) { 5772 ifp->valid_lft = 0; 5773 ifp->prefered_lft = 0; 5774 } 5775 spin_unlock(&ifp->lock); 5776 } 5777 5778 write_unlock_bh(&idev->lock); 5779 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5780 addrconf_verify_rtnl(); 5781 return 0; 5782} 5783 5784static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5785 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5786 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5787}; 5788 5789static int check_addr_gen_mode(int mode) 5790{ 5791 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5792 mode != IN6_ADDR_GEN_MODE_NONE && 5793 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5794 mode != IN6_ADDR_GEN_MODE_RANDOM) 5795 return -EINVAL; 5796 return 1; 5797} 5798 5799static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5800 int mode) 5801{ 5802 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5803 !idev->cnf.stable_secret.initialized && 5804 !net->ipv6.devconf_dflt->stable_secret.initialized) 5805 return -EINVAL; 5806 return 1; 5807} 5808 5809static int inet6_validate_link_af(const struct net_device *dev, 5810 const struct nlattr *nla) 5811{ 5812 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5813 struct inet6_dev *idev = NULL; 5814 int err; 5815 5816 if (dev) { 5817 idev = __in6_dev_get(dev); 5818 if (!idev) 5819 return -EAFNOSUPPORT; 5820 } 5821 5822 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, 5823 inet6_af_policy, NULL); 5824 if (err) 5825 return err; 5826 5827 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE]) 5828 return -EINVAL; 5829 5830 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5831 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5832 5833 if (check_addr_gen_mode(mode) < 0) 5834 return -EINVAL; 5835 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0) 5836 return -EINVAL; 5837 } 5838 5839 return 0; 5840} 5841 5842static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 5843{ 5844 struct inet6_dev *idev = __in6_dev_get(dev); 5845 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5846 int err; 5847 5848 if (!idev) 5849 return -EAFNOSUPPORT; 5850 5851 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 5852 return -EINVAL; 5853 5854 if (tb[IFLA_INET6_TOKEN]) { 5855 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 5856 if (err) 5857 return err; 5858 } 5859 5860 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5861 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5862 5863 idev->cnf.addr_gen_mode = mode; 5864 } 5865 5866 return 0; 5867} 5868 5869static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5870 u32 portid, u32 seq, int event, unsigned int flags) 5871{ 5872 struct net_device *dev = idev->dev; 5873 struct ifinfomsg *hdr; 5874 struct nlmsghdr *nlh; 5875 void *protoinfo; 5876 5877 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5878 if (!nlh) 5879 return -EMSGSIZE; 5880 5881 hdr = nlmsg_data(nlh); 5882 hdr->ifi_family = AF_INET6; 5883 hdr->__ifi_pad = 0; 5884 hdr->ifi_type = dev->type; 5885 hdr->ifi_index = dev->ifindex; 5886 hdr->ifi_flags = dev_get_flags(dev); 5887 hdr->ifi_change = 0; 5888 5889 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5890 (dev->addr_len && 5891 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5892 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5893 (dev->ifindex != dev_get_iflink(dev) && 5894 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5895 nla_put_u8(skb, IFLA_OPERSTATE, 5896 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5897 goto nla_put_failure; 5898 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO); 5899 if (!protoinfo) 5900 goto nla_put_failure; 5901 5902 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5903 goto nla_put_failure; 5904 5905 nla_nest_end(skb, protoinfo); 5906 nlmsg_end(skb, nlh); 5907 return 0; 5908 5909nla_put_failure: 5910 nlmsg_cancel(skb, nlh); 5911 return -EMSGSIZE; 5912} 5913 5914static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh, 5915 struct netlink_ext_ack *extack) 5916{ 5917 struct ifinfomsg *ifm; 5918 5919 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5920 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request"); 5921 return -EINVAL; 5922 } 5923 5924 if (nlmsg_attrlen(nlh, sizeof(*ifm))) { 5925 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header"); 5926 return -EINVAL; 5927 } 5928 5929 ifm = nlmsg_data(nlh); 5930 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || 5931 ifm->ifi_change || ifm->ifi_index) { 5932 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request"); 5933 return -EINVAL; 5934 } 5935 5936 return 0; 5937} 5938 5939static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5940{ 5941 struct net *net = sock_net(skb->sk); 5942 int h, s_h; 5943 int idx = 0, s_idx; 5944 struct net_device *dev; 5945 struct inet6_dev *idev; 5946 struct hlist_head *head; 5947 5948 /* only requests using strict checking can pass data to 5949 * influence the dump 5950 */ 5951 if (cb->strict_check) { 5952 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack); 5953 5954 if (err < 0) 5955 return err; 5956 } 5957 5958 s_h = cb->args[0]; 5959 s_idx = cb->args[1]; 5960 5961 rcu_read_lock(); 5962 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5963 idx = 0; 5964 head = &net->dev_index_head[h]; 5965 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5966 if (idx < s_idx) 5967 goto cont; 5968 idev = __in6_dev_get(dev); 5969 if (!idev) 5970 goto cont; 5971 if (inet6_fill_ifinfo(skb, idev, 5972 NETLINK_CB(cb->skb).portid, 5973 cb->nlh->nlmsg_seq, 5974 RTM_NEWLINK, NLM_F_MULTI) < 0) 5975 goto out; 5976cont: 5977 idx++; 5978 } 5979 } 5980out: 5981 rcu_read_unlock(); 5982 cb->args[1] = idx; 5983 cb->args[0] = h; 5984 5985 return skb->len; 5986} 5987 5988void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5989{ 5990 struct sk_buff *skb; 5991 struct net *net = dev_net(idev->dev); 5992 int err = -ENOBUFS; 5993 5994 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5995 if (!skb) 5996 goto errout; 5997 5998 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5999 if (err < 0) { 6000 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 6001 WARN_ON(err == -EMSGSIZE); 6002 kfree_skb(skb); 6003 goto errout; 6004 } 6005 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 6006 return; 6007errout: 6008 if (err < 0) 6009 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 6010} 6011 6012static inline size_t inet6_prefix_nlmsg_size(void) 6013{ 6014 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 6015 + nla_total_size(sizeof(struct in6_addr)) 6016 + nla_total_size(sizeof(struct prefix_cacheinfo)); 6017} 6018 6019static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 6020 struct prefix_info *pinfo, u32 portid, u32 seq, 6021 int event, unsigned int flags) 6022{ 6023 struct prefixmsg *pmsg; 6024 struct nlmsghdr *nlh; 6025 struct prefix_cacheinfo ci; 6026 6027 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 6028 if (!nlh) 6029 return -EMSGSIZE; 6030 6031 pmsg = nlmsg_data(nlh); 6032 pmsg->prefix_family = AF_INET6; 6033 pmsg->prefix_pad1 = 0; 6034 pmsg->prefix_pad2 = 0; 6035 pmsg->prefix_ifindex = idev->dev->ifindex; 6036 pmsg->prefix_len = pinfo->prefix_len; 6037 pmsg->prefix_type = pinfo->type; 6038 pmsg->prefix_pad3 = 0; 6039 pmsg->prefix_flags = pinfo->flags; 6040 6041 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 6042 goto nla_put_failure; 6043 ci.preferred_time = ntohl(pinfo->prefered); 6044 ci.valid_time = ntohl(pinfo->valid); 6045 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 6046 goto nla_put_failure; 6047 nlmsg_end(skb, nlh); 6048 return 0; 6049 6050nla_put_failure: 6051 nlmsg_cancel(skb, nlh); 6052 return -EMSGSIZE; 6053} 6054 6055static void inet6_prefix_notify(int event, struct inet6_dev *idev, 6056 struct prefix_info *pinfo) 6057{ 6058 struct sk_buff *skb; 6059 struct net *net = dev_net(idev->dev); 6060 int err = -ENOBUFS; 6061 6062 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 6063 if (!skb) 6064 goto errout; 6065 6066 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 6067 if (err < 0) { 6068 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 6069 WARN_ON(err == -EMSGSIZE); 6070 kfree_skb(skb); 6071 goto errout; 6072 } 6073 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 6074 return; 6075errout: 6076 if (err < 0) 6077 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 6078} 6079 6080static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6081{ 6082 struct net *net = dev_net(ifp->idev->dev); 6083 6084 if (event) 6085 ASSERT_RTNL(); 6086 6087 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 6088 6089 switch (event) { 6090 case RTM_NEWADDR: 6091 /* 6092 * If the address was optimistic we inserted the route at the 6093 * start of our DAD process, so we don't need to do it again. 6094 * If the device was taken down in the middle of the DAD 6095 * cycle there is a race where we could get here without a 6096 * host route, so nothing to insert. That will be fixed when 6097 * the device is brought up. 6098 */ 6099 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) { 6100 ip6_ins_rt(net, ifp->rt); 6101 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) { 6102 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n", 6103 &ifp->addr, ifp->idev->dev->name); 6104 } 6105 6106 if (ifp->idev->cnf.forwarding) 6107 addrconf_join_anycast(ifp); 6108 if (!ipv6_addr_any(&ifp->peer_addr)) 6109 addrconf_prefix_route(&ifp->peer_addr, 128, 6110 ifp->rt_priority, ifp->idev->dev, 6111 0, 0, GFP_ATOMIC); 6112 break; 6113 case RTM_DELADDR: 6114 if (ifp->idev->cnf.forwarding) 6115 addrconf_leave_anycast(ifp); 6116 addrconf_leave_solict(ifp->idev, &ifp->addr); 6117 if (!ipv6_addr_any(&ifp->peer_addr)) { 6118 struct fib6_info *rt; 6119 6120 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 6121 ifp->idev->dev, 0, 0, 6122 false); 6123 if (rt) 6124 ip6_del_rt(net, rt, false); 6125 } 6126 if (ifp->rt) { 6127 ip6_del_rt(net, ifp->rt, false); 6128 ifp->rt = NULL; 6129 } 6130 rt_genid_bump_ipv6(net); 6131 break; 6132 } 6133 atomic_inc(&net->ipv6.dev_addr_genid); 6134} 6135 6136static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6137{ 6138 rcu_read_lock_bh(); 6139 if (likely(ifp->idev->dead == 0)) 6140 __ipv6_ifa_notify(event, ifp); 6141 rcu_read_unlock_bh(); 6142} 6143 6144#ifdef CONFIG_SYSCTL 6145 6146static int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 6147 void *buffer, size_t *lenp, loff_t *ppos) 6148{ 6149 int *valp = ctl->data; 6150 int val = *valp; 6151 loff_t pos = *ppos; 6152 struct ctl_table lctl; 6153 int ret; 6154 6155 /* 6156 * ctl->data points to idev->cnf.forwarding, we should 6157 * not modify it until we get the rtnl lock. 6158 */ 6159 lctl = *ctl; 6160 lctl.data = &val; 6161 6162 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6163 6164 if (write) 6165 ret = addrconf_fixup_forwarding(ctl, valp, val); 6166 if (ret) 6167 *ppos = pos; 6168 return ret; 6169} 6170 6171static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 6172 void *buffer, size_t *lenp, loff_t *ppos) 6173{ 6174 struct inet6_dev *idev = ctl->extra1; 6175 int min_mtu = IPV6_MIN_MTU; 6176 struct ctl_table lctl; 6177 6178 lctl = *ctl; 6179 lctl.extra1 = &min_mtu; 6180 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 6181 6182 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 6183} 6184 6185static void dev_disable_change(struct inet6_dev *idev) 6186{ 6187 struct netdev_notifier_info info; 6188 6189 if (!idev || !idev->dev) 6190 return; 6191 6192 netdev_notifier_info_init(&info, idev->dev); 6193 if (idev->cnf.disable_ipv6) 6194 addrconf_notify(NULL, NETDEV_DOWN, &info); 6195 else 6196 addrconf_notify(NULL, NETDEV_UP, &info); 6197} 6198 6199static void addrconf_disable_change(struct net *net, __s32 newf) 6200{ 6201 struct net_device *dev; 6202 struct inet6_dev *idev; 6203 6204 for_each_netdev(net, dev) { 6205 idev = __in6_dev_get(dev); 6206 if (idev) { 6207 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 6208 idev->cnf.disable_ipv6 = newf; 6209 if (changed) 6210 dev_disable_change(idev); 6211 } 6212 } 6213} 6214 6215static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 6216{ 6217 struct net *net; 6218 int old; 6219 6220 if (!rtnl_trylock()) 6221 return restart_syscall(); 6222 6223 net = (struct net *)table->extra2; 6224 old = *p; 6225 *p = newf; 6226 6227 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 6228 rtnl_unlock(); 6229 return 0; 6230 } 6231 6232 if (p == &net->ipv6.devconf_all->disable_ipv6) { 6233 net->ipv6.devconf_dflt->disable_ipv6 = newf; 6234 addrconf_disable_change(net, newf); 6235 } else if ((!newf) ^ (!old)) 6236 dev_disable_change((struct inet6_dev *)table->extra1); 6237 6238 rtnl_unlock(); 6239 return 0; 6240} 6241 6242static int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 6243 void *buffer, size_t *lenp, loff_t *ppos) 6244{ 6245 int *valp = ctl->data; 6246 int val = *valp; 6247 loff_t pos = *ppos; 6248 struct ctl_table lctl; 6249 int ret; 6250 6251 /* 6252 * ctl->data points to idev->cnf.disable_ipv6, we should 6253 * not modify it until we get the rtnl lock. 6254 */ 6255 lctl = *ctl; 6256 lctl.data = &val; 6257 6258 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6259 6260 if (write) 6261 ret = addrconf_disable_ipv6(ctl, valp, val); 6262 if (ret) 6263 *ppos = pos; 6264 return ret; 6265} 6266 6267static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 6268 void *buffer, size_t *lenp, loff_t *ppos) 6269{ 6270 int *valp = ctl->data; 6271 int ret; 6272 int old, new; 6273 6274 old = *valp; 6275 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 6276 new = *valp; 6277 6278 if (write && old != new) { 6279 struct net *net = ctl->extra2; 6280 6281 if (!rtnl_trylock()) 6282 return restart_syscall(); 6283 6284 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 6285 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6286 NETCONFA_PROXY_NEIGH, 6287 NETCONFA_IFINDEX_DEFAULT, 6288 net->ipv6.devconf_dflt); 6289 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 6290 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6291 NETCONFA_PROXY_NEIGH, 6292 NETCONFA_IFINDEX_ALL, 6293 net->ipv6.devconf_all); 6294 else { 6295 struct inet6_dev *idev = ctl->extra1; 6296 6297 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6298 NETCONFA_PROXY_NEIGH, 6299 idev->dev->ifindex, 6300 &idev->cnf); 6301 } 6302 rtnl_unlock(); 6303 } 6304 6305 return ret; 6306} 6307 6308static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 6309 void *buffer, size_t *lenp, 6310 loff_t *ppos) 6311{ 6312 int ret = 0; 6313 u32 new_val; 6314 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 6315 struct net *net = (struct net *)ctl->extra2; 6316 struct ctl_table tmp = { 6317 .data = &new_val, 6318 .maxlen = sizeof(new_val), 6319 .mode = ctl->mode, 6320 }; 6321 6322 if (!rtnl_trylock()) 6323 return restart_syscall(); 6324 6325 new_val = *((u32 *)ctl->data); 6326 6327 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos); 6328 if (ret != 0) 6329 goto out; 6330 6331 if (write) { 6332 if (check_addr_gen_mode(new_val) < 0) { 6333 ret = -EINVAL; 6334 goto out; 6335 } 6336 6337 if (idev) { 6338 if (check_stable_privacy(idev, net, new_val) < 0) { 6339 ret = -EINVAL; 6340 goto out; 6341 } 6342 6343 if (idev->cnf.addr_gen_mode != new_val) { 6344 idev->cnf.addr_gen_mode = new_val; 6345 addrconf_dev_config(idev->dev); 6346 } 6347 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) { 6348 struct net_device *dev; 6349 6350 net->ipv6.devconf_dflt->addr_gen_mode = new_val; 6351 for_each_netdev(net, dev) { 6352 idev = __in6_dev_get(dev); 6353 if (idev && 6354 idev->cnf.addr_gen_mode != new_val) { 6355 idev->cnf.addr_gen_mode = new_val; 6356 addrconf_dev_config(idev->dev); 6357 } 6358 } 6359 } 6360 6361 *((u32 *)ctl->data) = new_val; 6362 } 6363 6364out: 6365 rtnl_unlock(); 6366 6367 return ret; 6368} 6369 6370static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 6371 void *buffer, size_t *lenp, 6372 loff_t *ppos) 6373{ 6374 int err; 6375 struct in6_addr addr; 6376 char str[IPV6_MAX_STRLEN]; 6377 struct ctl_table lctl = *ctl; 6378 struct net *net = ctl->extra2; 6379 struct ipv6_stable_secret *secret = ctl->data; 6380 6381 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 6382 return -EIO; 6383 6384 lctl.maxlen = IPV6_MAX_STRLEN; 6385 lctl.data = str; 6386 6387 if (!rtnl_trylock()) 6388 return restart_syscall(); 6389 6390 if (!write && !secret->initialized) { 6391 err = -EIO; 6392 goto out; 6393 } 6394 6395 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 6396 if (err >= sizeof(str)) { 6397 err = -EIO; 6398 goto out; 6399 } 6400 6401 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 6402 if (err || !write) 6403 goto out; 6404 6405 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 6406 err = -EIO; 6407 goto out; 6408 } 6409 6410 secret->initialized = true; 6411 secret->secret = addr; 6412 6413 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 6414 struct net_device *dev; 6415 6416 for_each_netdev(net, dev) { 6417 struct inet6_dev *idev = __in6_dev_get(dev); 6418 6419 if (idev) { 6420 idev->cnf.addr_gen_mode = 6421 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6422 } 6423 } 6424 } else { 6425 struct inet6_dev *idev = ctl->extra1; 6426 6427 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6428 } 6429 6430out: 6431 rtnl_unlock(); 6432 6433 return err; 6434} 6435 6436static 6437int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 6438 int write, void *buffer, 6439 size_t *lenp, 6440 loff_t *ppos) 6441{ 6442 int *valp = ctl->data; 6443 int val = *valp; 6444 loff_t pos = *ppos; 6445 struct ctl_table lctl; 6446 int ret; 6447 6448 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 6449 * we should not modify it until we get the rtnl lock. 6450 */ 6451 lctl = *ctl; 6452 lctl.data = &val; 6453 6454 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6455 6456 if (write) 6457 ret = addrconf_fixup_linkdown(ctl, valp, val); 6458 if (ret) 6459 *ppos = pos; 6460 return ret; 6461} 6462 6463static 6464void addrconf_set_nopolicy(struct rt6_info *rt, int action) 6465{ 6466 if (rt) { 6467 if (action) 6468 rt->dst.flags |= DST_NOPOLICY; 6469 else 6470 rt->dst.flags &= ~DST_NOPOLICY; 6471 } 6472} 6473 6474static 6475void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 6476{ 6477 struct inet6_ifaddr *ifa; 6478 6479 read_lock_bh(&idev->lock); 6480 list_for_each_entry(ifa, &idev->addr_list, if_list) { 6481 spin_lock(&ifa->lock); 6482 if (ifa->rt) { 6483 /* host routes only use builtin fib6_nh */ 6484 struct fib6_nh *nh = ifa->rt->fib6_nh; 6485 int cpu; 6486 6487 rcu_read_lock(); 6488 ifa->rt->dst_nopolicy = val ? true : false; 6489 if (nh->rt6i_pcpu) { 6490 for_each_possible_cpu(cpu) { 6491 struct rt6_info **rtp; 6492 6493 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu); 6494 addrconf_set_nopolicy(*rtp, val); 6495 } 6496 } 6497 rcu_read_unlock(); 6498 } 6499 spin_unlock(&ifa->lock); 6500 } 6501 read_unlock_bh(&idev->lock); 6502} 6503 6504static 6505int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 6506{ 6507 struct inet6_dev *idev; 6508 struct net *net; 6509 6510 if (!rtnl_trylock()) 6511 return restart_syscall(); 6512 6513 *valp = val; 6514 6515 net = (struct net *)ctl->extra2; 6516 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 6517 rtnl_unlock(); 6518 return 0; 6519 } 6520 6521 if (valp == &net->ipv6.devconf_all->disable_policy) { 6522 struct net_device *dev; 6523 6524 for_each_netdev(net, dev) { 6525 idev = __in6_dev_get(dev); 6526 if (idev) 6527 addrconf_disable_policy_idev(idev, val); 6528 } 6529 } else { 6530 idev = (struct inet6_dev *)ctl->extra1; 6531 addrconf_disable_policy_idev(idev, val); 6532 } 6533 6534 rtnl_unlock(); 6535 return 0; 6536} 6537 6538static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 6539 void *buffer, size_t *lenp, loff_t *ppos) 6540{ 6541 int *valp = ctl->data; 6542 int val = *valp; 6543 loff_t pos = *ppos; 6544 struct ctl_table lctl; 6545 int ret; 6546 6547 lctl = *ctl; 6548 lctl.data = &val; 6549 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6550 6551 if (write && (*valp != val)) 6552 ret = addrconf_disable_policy(ctl, valp, val); 6553 6554 if (ret) 6555 *ppos = pos; 6556 6557 return ret; 6558} 6559 6560static int minus_one = -1; 6561static const int two_five_five = 255; 6562 6563static const struct ctl_table addrconf_sysctl[] = { 6564 { 6565 .procname = "forwarding", 6566 .data = &ipv6_devconf.forwarding, 6567 .maxlen = sizeof(int), 6568 .mode = 0644, 6569 .proc_handler = addrconf_sysctl_forward, 6570 }, 6571 { 6572 .procname = "hop_limit", 6573 .data = &ipv6_devconf.hop_limit, 6574 .maxlen = sizeof(int), 6575 .mode = 0644, 6576 .proc_handler = proc_dointvec_minmax, 6577 .extra1 = (void *)SYSCTL_ONE, 6578 .extra2 = (void *)&two_five_five, 6579 }, 6580 { 6581 .procname = "mtu", 6582 .data = &ipv6_devconf.mtu6, 6583 .maxlen = sizeof(int), 6584 .mode = 0644, 6585 .proc_handler = addrconf_sysctl_mtu, 6586 }, 6587 { 6588 .procname = "accept_ra", 6589 .data = &ipv6_devconf.accept_ra, 6590 .maxlen = sizeof(int), 6591 .mode = 0644, 6592 .proc_handler = proc_dointvec, 6593 }, 6594 { 6595 .procname = "accept_redirects", 6596 .data = &ipv6_devconf.accept_redirects, 6597 .maxlen = sizeof(int), 6598 .mode = 0644, 6599 .proc_handler = proc_dointvec, 6600 }, 6601 { 6602 .procname = "autoconf", 6603 .data = &ipv6_devconf.autoconf, 6604 .maxlen = sizeof(int), 6605 .mode = 0644, 6606 .proc_handler = proc_dointvec, 6607 }, 6608 { 6609 .procname = "dad_transmits", 6610 .data = &ipv6_devconf.dad_transmits, 6611 .maxlen = sizeof(int), 6612 .mode = 0644, 6613 .proc_handler = proc_dointvec, 6614 }, 6615 { 6616 .procname = "router_solicitations", 6617 .data = &ipv6_devconf.rtr_solicits, 6618 .maxlen = sizeof(int), 6619 .mode = 0644, 6620 .proc_handler = proc_dointvec_minmax, 6621 .extra1 = &minus_one, 6622 }, 6623 { 6624 .procname = "router_solicitation_interval", 6625 .data = &ipv6_devconf.rtr_solicit_interval, 6626 .maxlen = sizeof(int), 6627 .mode = 0644, 6628 .proc_handler = proc_dointvec_jiffies, 6629 }, 6630 { 6631 .procname = "router_solicitation_max_interval", 6632 .data = &ipv6_devconf.rtr_solicit_max_interval, 6633 .maxlen = sizeof(int), 6634 .mode = 0644, 6635 .proc_handler = proc_dointvec_jiffies, 6636 }, 6637 { 6638 .procname = "router_solicitation_delay", 6639 .data = &ipv6_devconf.rtr_solicit_delay, 6640 .maxlen = sizeof(int), 6641 .mode = 0644, 6642 .proc_handler = proc_dointvec_jiffies, 6643 }, 6644 { 6645 .procname = "force_mld_version", 6646 .data = &ipv6_devconf.force_mld_version, 6647 .maxlen = sizeof(int), 6648 .mode = 0644, 6649 .proc_handler = proc_dointvec, 6650 }, 6651 { 6652 .procname = "mldv1_unsolicited_report_interval", 6653 .data = 6654 &ipv6_devconf.mldv1_unsolicited_report_interval, 6655 .maxlen = sizeof(int), 6656 .mode = 0644, 6657 .proc_handler = proc_dointvec_ms_jiffies, 6658 }, 6659 { 6660 .procname = "mldv2_unsolicited_report_interval", 6661 .data = 6662 &ipv6_devconf.mldv2_unsolicited_report_interval, 6663 .maxlen = sizeof(int), 6664 .mode = 0644, 6665 .proc_handler = proc_dointvec_ms_jiffies, 6666 }, 6667 { 6668 .procname = "use_tempaddr", 6669 .data = &ipv6_devconf.use_tempaddr, 6670 .maxlen = sizeof(int), 6671 .mode = 0644, 6672 .proc_handler = proc_dointvec, 6673 }, 6674 { 6675 .procname = "temp_valid_lft", 6676 .data = &ipv6_devconf.temp_valid_lft, 6677 .maxlen = sizeof(int), 6678 .mode = 0644, 6679 .proc_handler = proc_dointvec, 6680 }, 6681 { 6682 .procname = "temp_prefered_lft", 6683 .data = &ipv6_devconf.temp_prefered_lft, 6684 .maxlen = sizeof(int), 6685 .mode = 0644, 6686 .proc_handler = proc_dointvec, 6687 }, 6688 { 6689 .procname = "regen_max_retry", 6690 .data = &ipv6_devconf.regen_max_retry, 6691 .maxlen = sizeof(int), 6692 .mode = 0644, 6693 .proc_handler = proc_dointvec, 6694 }, 6695 { 6696 .procname = "max_desync_factor", 6697 .data = &ipv6_devconf.max_desync_factor, 6698 .maxlen = sizeof(int), 6699 .mode = 0644, 6700 .proc_handler = proc_dointvec, 6701 }, 6702 { 6703 .procname = "max_addresses", 6704 .data = &ipv6_devconf.max_addresses, 6705 .maxlen = sizeof(int), 6706 .mode = 0644, 6707 .proc_handler = proc_dointvec, 6708 }, 6709 { 6710 .procname = "accept_ra_defrtr", 6711 .data = &ipv6_devconf.accept_ra_defrtr, 6712 .maxlen = sizeof(int), 6713 .mode = 0644, 6714 .proc_handler = proc_dointvec, 6715 }, 6716 { 6717 .procname = "accept_ra_min_hop_limit", 6718 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6719 .maxlen = sizeof(int), 6720 .mode = 0644, 6721 .proc_handler = proc_dointvec, 6722 }, 6723 { 6724 .procname = "accept_ra_min_lft", 6725 .data = &ipv6_devconf.accept_ra_min_lft, 6726 .maxlen = sizeof(int), 6727 .mode = 0644, 6728 .proc_handler = proc_dointvec, 6729 }, 6730 { 6731 .procname = "accept_ra_pinfo", 6732 .data = &ipv6_devconf.accept_ra_pinfo, 6733 .maxlen = sizeof(int), 6734 .mode = 0644, 6735 .proc_handler = proc_dointvec, 6736 }, 6737#ifdef CONFIG_IPV6_ROUTER_PREF 6738 { 6739 .procname = "accept_ra_rtr_pref", 6740 .data = &ipv6_devconf.accept_ra_rtr_pref, 6741 .maxlen = sizeof(int), 6742 .mode = 0644, 6743 .proc_handler = proc_dointvec, 6744 }, 6745 { 6746 .procname = "router_probe_interval", 6747 .data = &ipv6_devconf.rtr_probe_interval, 6748 .maxlen = sizeof(int), 6749 .mode = 0644, 6750 .proc_handler = proc_dointvec_jiffies, 6751 }, 6752#ifdef CONFIG_IPV6_ROUTE_INFO 6753 { 6754 .procname = "accept_ra_rt_info_min_plen", 6755 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6756 .maxlen = sizeof(int), 6757 .mode = 0644, 6758 .proc_handler = proc_dointvec, 6759 }, 6760 { 6761 .procname = "accept_ra_rt_info_max_plen", 6762 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6763 .maxlen = sizeof(int), 6764 .mode = 0644, 6765 .proc_handler = proc_dointvec, 6766 }, 6767#endif 6768#endif 6769 { 6770 .procname = "proxy_ndp", 6771 .data = &ipv6_devconf.proxy_ndp, 6772 .maxlen = sizeof(int), 6773 .mode = 0644, 6774 .proc_handler = addrconf_sysctl_proxy_ndp, 6775 }, 6776 { 6777 .procname = "accept_source_route", 6778 .data = &ipv6_devconf.accept_source_route, 6779 .maxlen = sizeof(int), 6780 .mode = 0644, 6781 .proc_handler = proc_dointvec, 6782 }, 6783#ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6784 { 6785 .procname = "optimistic_dad", 6786 .data = &ipv6_devconf.optimistic_dad, 6787 .maxlen = sizeof(int), 6788 .mode = 0644, 6789 .proc_handler = proc_dointvec, 6790 }, 6791 { 6792 .procname = "use_optimistic", 6793 .data = &ipv6_devconf.use_optimistic, 6794 .maxlen = sizeof(int), 6795 .mode = 0644, 6796 .proc_handler = proc_dointvec, 6797 }, 6798#endif 6799#ifdef CONFIG_IPV6_MROUTE 6800 { 6801 .procname = "mc_forwarding", 6802 .data = &ipv6_devconf.mc_forwarding, 6803 .maxlen = sizeof(int), 6804 .mode = 0444, 6805 .proc_handler = proc_dointvec, 6806 }, 6807#endif 6808 { 6809 .procname = "disable_ipv6", 6810 .data = &ipv6_devconf.disable_ipv6, 6811 .maxlen = sizeof(int), 6812 .mode = 0644, 6813 .proc_handler = addrconf_sysctl_disable, 6814 }, 6815 { 6816 .procname = "accept_dad", 6817 .data = &ipv6_devconf.accept_dad, 6818 .maxlen = sizeof(int), 6819 .mode = 0644, 6820 .proc_handler = proc_dointvec, 6821 }, 6822 { 6823 .procname = "force_tllao", 6824 .data = &ipv6_devconf.force_tllao, 6825 .maxlen = sizeof(int), 6826 .mode = 0644, 6827 .proc_handler = proc_dointvec 6828 }, 6829 { 6830 .procname = "ndisc_notify", 6831 .data = &ipv6_devconf.ndisc_notify, 6832 .maxlen = sizeof(int), 6833 .mode = 0644, 6834 .proc_handler = proc_dointvec 6835 }, 6836 { 6837 .procname = "suppress_frag_ndisc", 6838 .data = &ipv6_devconf.suppress_frag_ndisc, 6839 .maxlen = sizeof(int), 6840 .mode = 0644, 6841 .proc_handler = proc_dointvec 6842 }, 6843 { 6844 .procname = "accept_ra_from_local", 6845 .data = &ipv6_devconf.accept_ra_from_local, 6846 .maxlen = sizeof(int), 6847 .mode = 0644, 6848 .proc_handler = proc_dointvec, 6849 }, 6850 { 6851 .procname = "accept_ra_mtu", 6852 .data = &ipv6_devconf.accept_ra_mtu, 6853 .maxlen = sizeof(int), 6854 .mode = 0644, 6855 .proc_handler = proc_dointvec, 6856 }, 6857 { 6858 .procname = "stable_secret", 6859 .data = &ipv6_devconf.stable_secret, 6860 .maxlen = IPV6_MAX_STRLEN, 6861 .mode = 0600, 6862 .proc_handler = addrconf_sysctl_stable_secret, 6863 }, 6864 { 6865 .procname = "use_oif_addrs_only", 6866 .data = &ipv6_devconf.use_oif_addrs_only, 6867 .maxlen = sizeof(int), 6868 .mode = 0644, 6869 .proc_handler = proc_dointvec, 6870 }, 6871 { 6872 .procname = "ignore_routes_with_linkdown", 6873 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6874 .maxlen = sizeof(int), 6875 .mode = 0644, 6876 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6877 }, 6878 { 6879 .procname = "drop_unicast_in_l2_multicast", 6880 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6881 .maxlen = sizeof(int), 6882 .mode = 0644, 6883 .proc_handler = proc_dointvec, 6884 }, 6885 { 6886 .procname = "drop_unsolicited_na", 6887 .data = &ipv6_devconf.drop_unsolicited_na, 6888 .maxlen = sizeof(int), 6889 .mode = 0644, 6890 .proc_handler = proc_dointvec, 6891 }, 6892 { 6893 .procname = "keep_addr_on_down", 6894 .data = &ipv6_devconf.keep_addr_on_down, 6895 .maxlen = sizeof(int), 6896 .mode = 0644, 6897 .proc_handler = proc_dointvec, 6898 6899 }, 6900 { 6901 .procname = "seg6_enabled", 6902 .data = &ipv6_devconf.seg6_enabled, 6903 .maxlen = sizeof(int), 6904 .mode = 0644, 6905 .proc_handler = proc_dointvec, 6906 }, 6907#ifdef CONFIG_IPV6_SEG6_HMAC 6908 { 6909 .procname = "seg6_require_hmac", 6910 .data = &ipv6_devconf.seg6_require_hmac, 6911 .maxlen = sizeof(int), 6912 .mode = 0644, 6913 .proc_handler = proc_dointvec, 6914 }, 6915#endif 6916 { 6917 .procname = "enhanced_dad", 6918 .data = &ipv6_devconf.enhanced_dad, 6919 .maxlen = sizeof(int), 6920 .mode = 0644, 6921 .proc_handler = proc_dointvec, 6922 }, 6923 { 6924 .procname = "addr_gen_mode", 6925 .data = &ipv6_devconf.addr_gen_mode, 6926 .maxlen = sizeof(int), 6927 .mode = 0644, 6928 .proc_handler = addrconf_sysctl_addr_gen_mode, 6929 }, 6930 { 6931 .procname = "disable_policy", 6932 .data = &ipv6_devconf.disable_policy, 6933 .maxlen = sizeof(int), 6934 .mode = 0644, 6935 .proc_handler = addrconf_sysctl_disable_policy, 6936 }, 6937 { 6938 .procname = "ndisc_tclass", 6939 .data = &ipv6_devconf.ndisc_tclass, 6940 .maxlen = sizeof(int), 6941 .mode = 0644, 6942 .proc_handler = proc_dointvec_minmax, 6943 .extra1 = (void *)SYSCTL_ZERO, 6944 .extra2 = (void *)&two_five_five, 6945 }, 6946 { 6947 .procname = "rpl_seg_enabled", 6948 .data = &ipv6_devconf.rpl_seg_enabled, 6949 .maxlen = sizeof(int), 6950 .mode = 0644, 6951 .proc_handler = proc_dointvec, 6952 }, 6953 { 6954 /* sentinel */ 6955 } 6956}; 6957 6958static int __addrconf_sysctl_register(struct net *net, char *dev_name, 6959 struct inet6_dev *idev, struct ipv6_devconf *p) 6960{ 6961 int i, ifindex; 6962 struct ctl_table *table; 6963 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 6964 6965 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 6966 if (!table) 6967 goto out; 6968 6969 for (i = 0; table[i].data; i++) { 6970 table[i].data += (char *)p - (char *)&ipv6_devconf; 6971 /* If one of these is already set, then it is not safe to 6972 * overwrite either of them: this makes proc_dointvec_minmax 6973 * usable. 6974 */ 6975 if (!table[i].extra1 && !table[i].extra2) { 6976 table[i].extra1 = idev; /* embedded; no ref */ 6977 table[i].extra2 = net; 6978 } 6979 } 6980 6981 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 6982 6983 p->sysctl_header = register_net_sysctl(net, path, table); 6984 if (!p->sysctl_header) 6985 goto free; 6986 6987 if (!strcmp(dev_name, "all")) 6988 ifindex = NETCONFA_IFINDEX_ALL; 6989 else if (!strcmp(dev_name, "default")) 6990 ifindex = NETCONFA_IFINDEX_DEFAULT; 6991 else 6992 ifindex = idev->dev->ifindex; 6993 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 6994 ifindex, p); 6995 return 0; 6996 6997free: 6998 kfree(table); 6999out: 7000 return -ENOBUFS; 7001} 7002 7003static void __addrconf_sysctl_unregister(struct net *net, 7004 struct ipv6_devconf *p, int ifindex) 7005{ 7006 struct ctl_table *table; 7007 7008 if (!p->sysctl_header) 7009 return; 7010 7011 table = p->sysctl_header->ctl_table_arg; 7012 unregister_net_sysctl_table(p->sysctl_header); 7013 p->sysctl_header = NULL; 7014 kfree(table); 7015 7016 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 7017} 7018 7019static int addrconf_sysctl_register(struct inet6_dev *idev) 7020{ 7021 int err; 7022 7023 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 7024 return -EINVAL; 7025 7026 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 7027 &ndisc_ifinfo_sysctl_change); 7028 if (err) 7029 return err; 7030 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 7031 idev, &idev->cnf); 7032 if (err) 7033 neigh_sysctl_unregister(idev->nd_parms); 7034 7035 return err; 7036} 7037 7038static void addrconf_sysctl_unregister(struct inet6_dev *idev) 7039{ 7040 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 7041 idev->dev->ifindex); 7042 neigh_sysctl_unregister(idev->nd_parms); 7043} 7044 7045 7046#endif 7047 7048static int __net_init addrconf_init_net(struct net *net) 7049{ 7050 int err = -ENOMEM; 7051 struct ipv6_devconf *all, *dflt; 7052 7053 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 7054 if (!all) 7055 goto err_alloc_all; 7056 7057 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 7058 if (!dflt) 7059 goto err_alloc_dflt; 7060 7061 if (!net_eq(net, &init_net)) { 7062 switch (net_inherit_devconf()) { 7063 case 1: /* copy from init_net */ 7064 memcpy(all, init_net.ipv6.devconf_all, 7065 sizeof(ipv6_devconf)); 7066 memcpy(dflt, init_net.ipv6.devconf_dflt, 7067 sizeof(ipv6_devconf_dflt)); 7068 break; 7069 case 3: /* copy from the current netns */ 7070 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all, 7071 sizeof(ipv6_devconf)); 7072 memcpy(dflt, 7073 current->nsproxy->net_ns->ipv6.devconf_dflt, 7074 sizeof(ipv6_devconf_dflt)); 7075 break; 7076 case 0: 7077 case 2: 7078 /* use compiled values */ 7079 break; 7080 } 7081 } 7082 7083 /* these will be inherited by all namespaces */ 7084 dflt->autoconf = ipv6_defaults.autoconf; 7085 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 7086 7087 dflt->stable_secret.initialized = false; 7088 all->stable_secret.initialized = false; 7089 7090 net->ipv6.devconf_all = all; 7091 net->ipv6.devconf_dflt = dflt; 7092 7093#ifdef CONFIG_SYSCTL 7094 err = __addrconf_sysctl_register(net, "all", NULL, all); 7095 if (err < 0) 7096 goto err_reg_all; 7097 7098 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 7099 if (err < 0) 7100 goto err_reg_dflt; 7101#endif 7102 return 0; 7103 7104#ifdef CONFIG_SYSCTL 7105err_reg_dflt: 7106 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 7107err_reg_all: 7108 kfree(dflt); 7109#endif 7110err_alloc_dflt: 7111 kfree(all); 7112err_alloc_all: 7113 return err; 7114} 7115 7116static void __net_exit addrconf_exit_net(struct net *net) 7117{ 7118#ifdef CONFIG_SYSCTL 7119 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 7120 NETCONFA_IFINDEX_DEFAULT); 7121 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 7122 NETCONFA_IFINDEX_ALL); 7123#endif 7124 kfree(net->ipv6.devconf_dflt); 7125 kfree(net->ipv6.devconf_all); 7126} 7127 7128static struct pernet_operations addrconf_ops = { 7129 .init = addrconf_init_net, 7130 .exit = addrconf_exit_net, 7131}; 7132 7133static struct rtnl_af_ops inet6_ops __read_mostly = { 7134 .family = AF_INET6, 7135 .fill_link_af = inet6_fill_link_af, 7136 .get_link_af_size = inet6_get_link_af_size, 7137 .validate_link_af = inet6_validate_link_af, 7138 .set_link_af = inet6_set_link_af, 7139}; 7140 7141/* 7142 * Init / cleanup code 7143 */ 7144 7145int __init addrconf_init(void) 7146{ 7147 struct inet6_dev *idev; 7148 int i, err; 7149 7150 err = ipv6_addr_label_init(); 7151 if (err < 0) { 7152 pr_crit("%s: cannot initialize default policy table: %d\n", 7153 __func__, err); 7154 goto out; 7155 } 7156 7157 err = register_pernet_subsys(&addrconf_ops); 7158 if (err < 0) 7159 goto out_addrlabel; 7160 7161 addrconf_wq = create_workqueue("ipv6_addrconf"); 7162 if (!addrconf_wq) { 7163 err = -ENOMEM; 7164 goto out_nowq; 7165 } 7166 7167 /* The addrconf netdev notifier requires that loopback_dev 7168 * has it's ipv6 private information allocated and setup 7169 * before it can bring up and give link-local addresses 7170 * to other devices which are up. 7171 * 7172 * Unfortunately, loopback_dev is not necessarily the first 7173 * entry in the global dev_base list of net devices. In fact, 7174 * it is likely to be the very last entry on that list. 7175 * So this causes the notifier registry below to try and 7176 * give link-local addresses to all devices besides loopback_dev 7177 * first, then loopback_dev, which cases all the non-loopback_dev 7178 * devices to fail to get a link-local address. 7179 * 7180 * So, as a temporary fix, allocate the ipv6 structure for 7181 * loopback_dev first by hand. 7182 * Longer term, all of the dependencies ipv6 has upon the loopback 7183 * device and it being up should be removed. 7184 */ 7185 rtnl_lock(); 7186 idev = ipv6_add_dev(init_net.loopback_dev); 7187 rtnl_unlock(); 7188 if (IS_ERR(idev)) { 7189 err = PTR_ERR(idev); 7190 goto errlo; 7191 } 7192 7193 ip6_route_init_special_entries(); 7194 7195 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7196 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 7197 7198 register_netdevice_notifier(&ipv6_dev_notf); 7199 7200 addrconf_verify(); 7201 7202 rtnl_af_register(&inet6_ops); 7203 7204 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK, 7205 NULL, inet6_dump_ifinfo, 0); 7206 if (err < 0) 7207 goto errout; 7208 7209 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR, 7210 inet6_rtm_newaddr, NULL, 0); 7211 if (err < 0) 7212 goto errout; 7213 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR, 7214 inet6_rtm_deladdr, NULL, 0); 7215 if (err < 0) 7216 goto errout; 7217 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR, 7218 inet6_rtm_getaddr, inet6_dump_ifaddr, 7219 RTNL_FLAG_DOIT_UNLOCKED); 7220 if (err < 0) 7221 goto errout; 7222 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST, 7223 NULL, inet6_dump_ifmcaddr, 0); 7224 if (err < 0) 7225 goto errout; 7226 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST, 7227 NULL, inet6_dump_ifacaddr, 0); 7228 if (err < 0) 7229 goto errout; 7230 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF, 7231 inet6_netconf_get_devconf, 7232 inet6_netconf_dump_devconf, 7233 RTNL_FLAG_DOIT_UNLOCKED); 7234 if (err < 0) 7235 goto errout; 7236 err = ipv6_addr_label_rtnl_register(); 7237 if (err < 0) 7238 goto errout; 7239 7240 return 0; 7241errout: 7242 rtnl_unregister_all(PF_INET6); 7243 rtnl_af_unregister(&inet6_ops); 7244 unregister_netdevice_notifier(&ipv6_dev_notf); 7245errlo: 7246 destroy_workqueue(addrconf_wq); 7247out_nowq: 7248 unregister_pernet_subsys(&addrconf_ops); 7249out_addrlabel: 7250 ipv6_addr_label_cleanup(); 7251out: 7252 return err; 7253} 7254 7255void addrconf_cleanup(void) 7256{ 7257 struct net_device *dev; 7258 int i; 7259 7260 unregister_netdevice_notifier(&ipv6_dev_notf); 7261 unregister_pernet_subsys(&addrconf_ops); 7262 ipv6_addr_label_cleanup(); 7263 7264 rtnl_af_unregister(&inet6_ops); 7265 7266 rtnl_lock(); 7267 7268 /* clean dev list */ 7269 for_each_netdev(&init_net, dev) { 7270 if (__in6_dev_get(dev) == NULL) 7271 continue; 7272 addrconf_ifdown(dev, true); 7273 } 7274 addrconf_ifdown(init_net.loopback_dev, true); 7275 7276 /* 7277 * Check hash table. 7278 */ 7279 spin_lock_bh(&addrconf_hash_lock); 7280 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7281 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 7282 spin_unlock_bh(&addrconf_hash_lock); 7283 cancel_delayed_work(&addr_chk_work); 7284 rtnl_unlock(); 7285 7286 destroy_workqueue(addrconf_wq); 7287} 7288