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