1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ADDRCONF_H 3 #define _ADDRCONF_H 4 5 #define MAX_RTR_SOLICITATIONS -1 /* unlimited */ 6 #define RTR_SOLICITATION_INTERVAL (4*HZ) 7 #define RTR_SOLICITATION_MAX_INTERVAL (3600*HZ) /* 1 hour */ 8 9 #define MIN_VALID_LIFETIME (2*3600) /* 2 hours */ 10 11 #define TEMP_VALID_LIFETIME (7*86400) /* 1 week */ 12 #define TEMP_PREFERRED_LIFETIME (86400) /* 24 hours */ 13 #define REGEN_MIN_ADVANCE (2) /* 2 seconds */ 14 #define REGEN_MAX_RETRY (3) 15 #define MAX_DESYNC_FACTOR (600) 16 17 #define ADDR_CHECK_FREQUENCY (120*HZ) 18 19 #define IPV6_MAX_ADDRESSES 16 20 21 #define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ / 50 : 1) 22 #define ADDRCONF_TIMER_FUZZ (HZ / 4) 23 #define ADDRCONF_TIMER_FUZZ_MAX (HZ) 24 25 #define ADDRCONF_NOTIFY_PRIORITY 0 26 27 #include <linux/in.h> 28 #include <linux/in6.h> 29 30 struct prefix_info { 31 __u8 type; 32 __u8 length; 33 __u8 prefix_len; 34 35 union __packed { 36 __u8 flags; 37 struct __packed { 38 #if defined(__BIG_ENDIAN_BITFIELD) 39 __u8 onlink : 1, 40 autoconf : 1, 41 routeraddr : 1, 42 preferpd : 1, 43 reserved : 4; 44 #elif defined(__LITTLE_ENDIAN_BITFIELD) 45 __u8 reserved : 4, 46 preferpd : 1, 47 routeraddr : 1, 48 autoconf : 1, 49 onlink : 1; 50 #else 51 #error "Please fix <asm/byteorder.h>" 52 #endif 53 }; 54 }; 55 __be32 valid; 56 __be32 prefered; 57 __be32 reserved2; 58 59 struct in6_addr prefix; 60 }; 61 62 /* rfc4861 4.6.2: IPv6 PIO is 32 bytes in size */ 63 static_assert(sizeof(struct prefix_info) == 32); 64 65 #include <linux/ipv6.h> 66 #include <linux/netdevice.h> 67 #include <net/if_inet6.h> 68 #include <net/ipv6.h> 69 70 struct in6_validator_info { 71 struct in6_addr i6vi_addr; 72 struct inet6_dev *i6vi_dev; 73 struct netlink_ext_ack *extack; 74 }; 75 76 struct ifa6_config { 77 const struct in6_addr *pfx; 78 unsigned int plen; 79 80 u8 ifa_proto; 81 82 const struct in6_addr *peer_pfx; 83 84 u32 rt_priority; 85 u32 ifa_flags; 86 u32 preferred_lft; 87 u32 valid_lft; 88 u16 scope; 89 }; 90 91 int addrconf_init(void); 92 void addrconf_cleanup(void); 93 94 int addrconf_add_ifaddr(struct net *net, void __user *arg); 95 int addrconf_del_ifaddr(struct net *net, void __user *arg); 96 int addrconf_set_dstaddr(struct net *net, void __user *arg); 97 98 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 99 const struct net_device *dev, int strict); 100 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 101 const struct net_device *dev, bool skip_dev_check, 102 int strict, u32 banned_flags); 103 104 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 105 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr); 106 #endif 107 108 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs, 109 unsigned char nsegs); 110 111 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 112 const unsigned int prefix_len, 113 struct net_device *dev); 114 115 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev); 116 117 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr, 118 struct net_device *dev); 119 120 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, 121 const struct in6_addr *addr, 122 struct net_device *dev, int strict); 123 124 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev, 125 const struct in6_addr *daddr, unsigned int srcprefs, 126 struct in6_addr *saddr); 127 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 128 u32 banned_flags); 129 bool inet_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2, 130 bool match_wildcard); 131 bool inet_rcv_saddr_any(const struct sock *sk); 132 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr); 133 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr); 134 135 void addrconf_add_linklocal(struct inet6_dev *idev, 136 const struct in6_addr *addr, u32 flags); 137 138 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 139 const struct prefix_info *pinfo, 140 struct inet6_dev *in6_dev, 141 const struct in6_addr *addr, int addr_type, 142 u32 addr_flags, bool sllao, bool tokenized, 143 __u32 valid_lft, u32 prefered_lft); 144 145 static inline void addrconf_addr_eui48_base(u8 *eui, const char *const addr) 146 { 147 memcpy(eui, addr, 3); 148 eui[3] = 0xFF; 149 eui[4] = 0xFE; 150 memcpy(eui + 5, addr + 3, 3); 151 } 152 153 static inline void addrconf_addr_eui48(u8 *eui, const char *const addr) 154 { 155 addrconf_addr_eui48_base(eui, addr); 156 eui[0] ^= 2; 157 } 158 159 static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 160 { 161 if (dev->addr_len != ETH_ALEN) 162 return -1; 163 164 /* 165 * The zSeries OSA network cards can be shared among various 166 * OS instances, but the OSA cards have only one MAC address. 167 * This leads to duplicate address conflicts in conjunction 168 * with IPv6 if more than one instance uses the same card. 169 * 170 * The driver for these cards can deliver a unique 16-bit 171 * identifier for each instance sharing the same card. It is 172 * placed instead of 0xFFFE in the interface identifier. The 173 * "u" bit of the interface identifier is not inverted in this 174 * case. Hence the resulting interface identifier has local 175 * scope according to RFC2373. 176 */ 177 178 addrconf_addr_eui48_base(eui, dev->dev_addr); 179 180 if (dev->dev_id) { 181 eui[3] = (dev->dev_id >> 8) & 0xFF; 182 eui[4] = dev->dev_id & 0xFF; 183 } else { 184 eui[0] ^= 2; 185 } 186 187 return 0; 188 } 189 190 static inline unsigned long addrconf_timeout_fixup(u32 timeout, 191 unsigned int unit) 192 { 193 if (timeout == 0xffffffff) 194 return ~0UL; 195 196 /* 197 * Avoid arithmetic overflow. 198 * Assuming unit is constant and non-zero, this "if" statement 199 * will go away on 64bit archs. 200 */ 201 if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit) 202 return LONG_MAX / unit; 203 204 return timeout; 205 } 206 207 static inline int addrconf_finite_timeout(unsigned long timeout) 208 { 209 return ~timeout; 210 } 211 212 /* 213 * IPv6 Address Label subsystem (addrlabel.c) 214 */ 215 int ipv6_addr_label_init(void); 216 void ipv6_addr_label_cleanup(void); 217 int ipv6_addr_label_rtnl_register(void); 218 u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr, 219 int type, int ifindex); 220 221 /* 222 * multicast prototypes (mcast.c) 223 */ 224 static inline bool ipv6_mc_may_pull(struct sk_buff *skb, 225 unsigned int len) 226 { 227 if (skb_transport_offset(skb) + ipv6_transport_len(skb) < len) 228 return false; 229 230 return pskb_may_pull(skb, len); 231 } 232 233 int ipv6_sock_mc_join(struct sock *sk, int ifindex, 234 const struct in6_addr *addr); 235 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, 236 const struct in6_addr *addr); 237 void __ipv6_sock_mc_close(struct sock *sk); 238 void ipv6_sock_mc_close(struct sock *sk); 239 bool inet6_mc_check(const struct sock *sk, const struct in6_addr *mc_addr, 240 const struct in6_addr *src_addr); 241 242 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr); 243 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr); 244 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr); 245 void ipv6_mc_up(struct inet6_dev *idev); 246 void ipv6_mc_down(struct inet6_dev *idev); 247 void ipv6_mc_unmap(struct inet6_dev *idev); 248 void ipv6_mc_remap(struct inet6_dev *idev); 249 void ipv6_mc_init_dev(struct inet6_dev *idev); 250 void ipv6_mc_destroy_dev(struct inet6_dev *idev); 251 int ipv6_mc_check_mld(struct sk_buff *skb); 252 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp); 253 254 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, 255 const struct in6_addr *src_addr); 256 257 void ipv6_mc_dad_complete(struct inet6_dev *idev); 258 259 /* 260 * identify MLD packets for MLD filter exceptions 261 */ 262 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset) 263 { 264 struct icmp6hdr *hdr; 265 266 if (nexthdr != IPPROTO_ICMPV6 || 267 !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr))) 268 return false; 269 270 hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset); 271 272 switch (hdr->icmp6_type) { 273 case ICMPV6_MGM_QUERY: 274 case ICMPV6_MGM_REPORT: 275 case ICMPV6_MGM_REDUCTION: 276 case ICMPV6_MLD2_REPORT: 277 return true; 278 default: 279 break; 280 } 281 return false; 282 } 283 284 void addrconf_prefix_rcv(struct net_device *dev, 285 u8 *opt, int len, bool sllao); 286 287 /* 288 * anycast prototypes (anycast.c) 289 */ 290 int ipv6_sock_ac_join(struct sock *sk, int ifindex, 291 const struct in6_addr *addr); 292 int ipv6_sock_ac_drop(struct sock *sk, int ifindex, 293 const struct in6_addr *addr); 294 void __ipv6_sock_ac_close(struct sock *sk); 295 void ipv6_sock_ac_close(struct sock *sk); 296 297 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr); 298 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr); 299 void ipv6_ac_destroy_dev(struct inet6_dev *idev); 300 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev, 301 const struct in6_addr *addr); 302 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev, 303 const struct in6_addr *addr); 304 int ipv6_anycast_init(void); 305 void ipv6_anycast_cleanup(void); 306 307 /* Device notifier */ 308 int register_inet6addr_notifier(struct notifier_block *nb); 309 int unregister_inet6addr_notifier(struct notifier_block *nb); 310 int inet6addr_notifier_call_chain(unsigned long val, void *v); 311 312 int register_inet6addr_validator_notifier(struct notifier_block *nb); 313 int unregister_inet6addr_validator_notifier(struct notifier_block *nb); 314 int inet6addr_validator_notifier_call_chain(unsigned long val, void *v); 315 316 void inet6_netconf_notify_devconf(struct net *net, int event, int type, 317 int ifindex, struct ipv6_devconf *devconf); 318 319 /** 320 * __in6_dev_get - get inet6_dev pointer from netdevice 321 * @dev: network device 322 * 323 * Caller must hold rcu_read_lock or RTNL, because this function 324 * does not take a reference on the inet6_dev. 325 */ 326 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev) 327 { 328 return rcu_dereference_rtnl(dev->ip6_ptr); 329 } 330 331 /** 332 * __in6_dev_stats_get - get inet6_dev pointer for stats 333 * @dev: network device 334 * @skb: skb for original incoming interface if neeeded 335 * 336 * Caller must hold rcu_read_lock or RTNL, because this function 337 * does not take a reference on the inet6_dev. 338 */ 339 static inline struct inet6_dev *__in6_dev_stats_get(const struct net_device *dev, 340 const struct sk_buff *skb) 341 { 342 if (netif_is_l3_master(dev)) 343 dev = dev_get_by_index_rcu(dev_net(dev), inet6_iif(skb)); 344 return __in6_dev_get(dev); 345 } 346 347 /** 348 * __in6_dev_get_safely - get inet6_dev pointer from netdevice 349 * @dev: network device 350 * 351 * This is a safer version of __in6_dev_get 352 */ 353 static inline struct inet6_dev *__in6_dev_get_safely(const struct net_device *dev) 354 { 355 if (likely(dev)) 356 return rcu_dereference_rtnl(dev->ip6_ptr); 357 else 358 return NULL; 359 } 360 361 /** 362 * in6_dev_get - get inet6_dev pointer from netdevice 363 * @dev: network device 364 * 365 * This version can be used in any context, and takes a reference 366 * on the inet6_dev. Callers must use in6_dev_put() later to 367 * release this reference. 368 */ 369 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev) 370 { 371 struct inet6_dev *idev; 372 373 rcu_read_lock(); 374 idev = rcu_dereference(dev->ip6_ptr); 375 if (idev) 376 refcount_inc(&idev->refcnt); 377 rcu_read_unlock(); 378 return idev; 379 } 380 381 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev) 382 { 383 struct inet6_dev *idev = __in6_dev_get(dev); 384 385 return idev ? idev->nd_parms : NULL; 386 } 387 388 void in6_dev_finish_destroy(struct inet6_dev *idev); 389 390 static inline void in6_dev_put(struct inet6_dev *idev) 391 { 392 if (refcount_dec_and_test(&idev->refcnt)) 393 in6_dev_finish_destroy(idev); 394 } 395 396 static inline void in6_dev_put_clear(struct inet6_dev **pidev) 397 { 398 struct inet6_dev *idev = *pidev; 399 400 if (idev) { 401 in6_dev_put(idev); 402 *pidev = NULL; 403 } 404 } 405 406 static inline void __in6_dev_put(struct inet6_dev *idev) 407 { 408 refcount_dec(&idev->refcnt); 409 } 410 411 static inline void in6_dev_hold(struct inet6_dev *idev) 412 { 413 refcount_inc(&idev->refcnt); 414 } 415 416 /* called with rcu_read_lock held */ 417 static inline bool ip6_ignore_linkdown(const struct net_device *dev) 418 { 419 const struct inet6_dev *idev = __in6_dev_get(dev); 420 421 if (unlikely(!idev)) 422 return true; 423 424 return !!READ_ONCE(idev->cnf.ignore_routes_with_linkdown); 425 } 426 427 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp); 428 429 static inline void in6_ifa_put(struct inet6_ifaddr *ifp) 430 { 431 if (refcount_dec_and_test(&ifp->refcnt)) 432 inet6_ifa_finish_destroy(ifp); 433 } 434 435 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp) 436 { 437 refcount_dec(&ifp->refcnt); 438 } 439 440 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp) 441 { 442 refcount_inc(&ifp->refcnt); 443 } 444 445 static inline bool in6_ifa_hold_safe(struct inet6_ifaddr *ifp) 446 { 447 return refcount_inc_not_zero(&ifp->refcnt); 448 } 449 450 /* 451 * compute link-local solicited-node multicast address 452 */ 453 454 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr, 455 struct in6_addr *solicited) 456 { 457 ipv6_addr_set(solicited, 458 htonl(0xFF020000), 0, 459 htonl(0x1), 460 htonl(0xFF000000) | addr->s6_addr32[3]); 461 } 462 463 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr) 464 { 465 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 466 __be64 *p = (__force __be64 *)addr; 467 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL; 468 #else 469 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 470 addr->s6_addr32[1] | addr->s6_addr32[2] | 471 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0; 472 #endif 473 } 474 475 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr) 476 { 477 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 478 __be64 *p = (__force __be64 *)addr; 479 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL; 480 #else 481 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 482 addr->s6_addr32[1] | addr->s6_addr32[2] | 483 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0; 484 #endif 485 } 486 487 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr) 488 { 489 return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE); 490 } 491 492 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr) 493 { 494 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 495 __be64 *p = (__force __be64 *)addr; 496 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | 497 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) & 498 cpu_to_be64(0xffffffffff000000UL))) == 0UL; 499 #else 500 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 501 addr->s6_addr32[1] | 502 (addr->s6_addr32[2] ^ htonl(0x00000001)) | 503 (addr->s6_addr[12] ^ 0xff)) == 0; 504 #endif 505 } 506 507 static inline bool ipv6_addr_is_all_snoopers(const struct in6_addr *addr) 508 { 509 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 510 __be64 *p = (__force __be64 *)addr; 511 512 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | 513 (p[1] ^ cpu_to_be64(0x6a))) == 0UL; 514 #else 515 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 516 addr->s6_addr32[1] | addr->s6_addr32[2] | 517 (addr->s6_addr32[3] ^ htonl(0x0000006a))) == 0; 518 #endif 519 } 520 521 #ifdef CONFIG_PROC_FS 522 int if6_proc_init(void); 523 void if6_proc_exit(void); 524 #endif 525 526 #endif 527