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