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