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 TEMP_VALID_LIFETIME (7*86400) 10 #define TEMP_PREFERRED_LIFETIME (86400) 11 #define REGEN_MAX_RETRY (3) 12 #define MAX_DESYNC_FACTOR (600) 13 14 #define ADDR_CHECK_FREQUENCY (120*HZ) 15 16 #define IPV6_MAX_ADDRESSES 16 17 18 #define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ / 50 : 1) 19 #define ADDRCONF_TIMER_FUZZ (HZ / 4) 20 #define ADDRCONF_TIMER_FUZZ_MAX (HZ) 21 22 #define ADDRCONF_NOTIFY_PRIORITY 0 23 24 #include <linux/in.h> 25 #include <linux/in6.h> 26 27 struct prefix_info { 28 __u8 type; 29 __u8 length; 30 __u8 prefix_len; 31 32 #if defined(__BIG_ENDIAN_BITFIELD) 33 __u8 onlink : 1, 34 autoconf : 1, 35 reserved : 6; 36 #elif defined(__LITTLE_ENDIAN_BITFIELD) 37 __u8 reserved : 6, 38 autoconf : 1, 39 onlink : 1; 40 #else 41 #error "Please fix <asm/byteorder.h>" 42 #endif 43 __be32 valid; 44 __be32 prefered; 45 __be32 reserved2; 46 47 struct in6_addr prefix; 48 }; 49 50 #include <linux/ipv6.h> 51 #include <linux/netdevice.h> 52 #include <net/if_inet6.h> 53 #include <net/ipv6.h> 54 55 struct in6_validator_info { 56 struct in6_addr i6vi_addr; 57 struct inet6_dev *i6vi_dev; 58 struct netlink_ext_ack *extack; 59 }; 60 61 struct ifa6_config { 62 const struct in6_addr *pfx; 63 unsigned int plen; 64 65 const struct in6_addr *peer_pfx; 66 67 u32 rt_priority; 68 u32 ifa_flags; 69 u32 preferred_lft; 70 u32 valid_lft; 71 u16 scope; 72 }; 73 74 int addrconf_init(void); 75 void addrconf_cleanup(void); 76 77 int addrconf_add_ifaddr(struct net *net, void __user *arg); 78 int addrconf_del_ifaddr(struct net *net, void __user *arg); 79 int addrconf_set_dstaddr(struct net *net, void __user *arg); 80 81 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 82 const struct net_device *dev, int strict); 83 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 84 const struct net_device *dev, bool skip_dev_check, 85 int strict, u32 banned_flags); 86 87 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 88 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr); 89 #endif 90 91 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs, 92 unsigned char nsegs); 93 94 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 95 const unsigned int prefix_len, 96 struct net_device *dev); 97 98 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev); 99 100 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr, 101 struct net_device *dev); 102 103 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, 104 const struct in6_addr *addr, 105 struct net_device *dev, int strict); 106 107 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev, 108 const struct in6_addr *daddr, unsigned int srcprefs, 109 struct in6_addr *saddr); 110 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 111 u32 banned_flags); 112 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 113 u32 banned_flags); 114 bool inet_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2, 115 bool match_wildcard); 116 bool inet_rcv_saddr_any(const struct sock *sk); 117 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr); 118 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr); 119 120 void addrconf_add_linklocal(struct inet6_dev *idev, 121 const struct in6_addr *addr, u32 flags); 122 123 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 124 const struct prefix_info *pinfo, 125 struct inet6_dev *in6_dev, 126 const struct in6_addr *addr, int addr_type, 127 u32 addr_flags, bool sllao, bool tokenized, 128 __u32 valid_lft, u32 prefered_lft); 129 130 static inline void addrconf_addr_eui48_base(u8 *eui, const char *const addr) 131 { 132 memcpy(eui, addr, 3); 133 eui[3] = 0xFF; 134 eui[4] = 0xFE; 135 memcpy(eui + 5, addr + 3, 3); 136 } 137 138 static inline void addrconf_addr_eui48(u8 *eui, const char *const addr) 139 { 140 addrconf_addr_eui48_base(eui, addr); 141 eui[0] ^= 2; 142 } 143 144 static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 145 { 146 if (dev->addr_len != ETH_ALEN) 147 return -1; 148 149 /* 150 * The zSeries OSA network cards can be shared among various 151 * OS instances, but the OSA cards have only one MAC address. 152 * This leads to duplicate address conflicts in conjunction 153 * with IPv6 if more than one instance uses the same card. 154 * 155 * The driver for these cards can deliver a unique 16-bit 156 * identifier for each instance sharing the same card. It is 157 * placed instead of 0xFFFE in the interface identifier. The 158 * "u" bit of the interface identifier is not inverted in this 159 * case. Hence the resulting interface identifier has local 160 * scope according to RFC2373. 161 */ 162 163 addrconf_addr_eui48_base(eui, dev->dev_addr); 164 165 if (dev->dev_id) { 166 eui[3] = (dev->dev_id >> 8) & 0xFF; 167 eui[4] = dev->dev_id & 0xFF; 168 } else { 169 eui[0] ^= 2; 170 } 171 172 return 0; 173 } 174 175 static inline unsigned long addrconf_timeout_fixup(u32 timeout, 176 unsigned int unit) 177 { 178 if (timeout == 0xffffffff) 179 return ~0UL; 180 181 /* 182 * Avoid arithmetic overflow. 183 * Assuming unit is constant and non-zero, this "if" statement 184 * will go away on 64bit archs. 185 */ 186 if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit) 187 return LONG_MAX / unit; 188 189 return timeout; 190 } 191 192 static inline int addrconf_finite_timeout(unsigned long timeout) 193 { 194 return ~timeout; 195 } 196 197 /* 198 * IPv6 Address Label subsystem (addrlabel.c) 199 */ 200 int ipv6_addr_label_init(void); 201 void ipv6_addr_label_cleanup(void); 202 int ipv6_addr_label_rtnl_register(void); 203 u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr, 204 int type, int ifindex); 205 206 /* 207 * multicast prototypes (mcast.c) 208 */ 209 static inline bool ipv6_mc_may_pull(struct sk_buff *skb, 210 unsigned int len) 211 { 212 if (skb_transport_offset(skb) + ipv6_transport_len(skb) < len) 213 return false; 214 215 return pskb_may_pull(skb, len); 216 } 217 218 int ipv6_sock_mc_join(struct sock *sk, int ifindex, 219 const struct in6_addr *addr); 220 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, 221 const struct in6_addr *addr); 222 void __ipv6_sock_mc_close(struct sock *sk); 223 void ipv6_sock_mc_close(struct sock *sk); 224 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr, 225 const struct in6_addr *src_addr); 226 227 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr); 228 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr); 229 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr); 230 void ipv6_mc_up(struct inet6_dev *idev); 231 void ipv6_mc_down(struct inet6_dev *idev); 232 void ipv6_mc_unmap(struct inet6_dev *idev); 233 void ipv6_mc_remap(struct inet6_dev *idev); 234 void ipv6_mc_init_dev(struct inet6_dev *idev); 235 void ipv6_mc_destroy_dev(struct inet6_dev *idev); 236 int ipv6_mc_check_mld(struct sk_buff *skb); 237 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp); 238 239 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, 240 const struct in6_addr *src_addr); 241 242 void ipv6_mc_dad_complete(struct inet6_dev *idev); 243 244 /* 245 * identify MLD packets for MLD filter exceptions 246 */ 247 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset) 248 { 249 struct icmp6hdr *hdr; 250 251 if (nexthdr != IPPROTO_ICMPV6 || 252 !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr))) 253 return false; 254 255 hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset); 256 257 switch (hdr->icmp6_type) { 258 case ICMPV6_MGM_QUERY: 259 case ICMPV6_MGM_REPORT: 260 case ICMPV6_MGM_REDUCTION: 261 case ICMPV6_MLD2_REPORT: 262 return true; 263 default: 264 break; 265 } 266 return false; 267 } 268 269 void addrconf_prefix_rcv(struct net_device *dev, 270 u8 *opt, int len, bool sllao); 271 272 /* 273 * anycast prototypes (anycast.c) 274 */ 275 int ipv6_sock_ac_join(struct sock *sk, int ifindex, 276 const struct in6_addr *addr); 277 int ipv6_sock_ac_drop(struct sock *sk, int ifindex, 278 const struct in6_addr *addr); 279 void __ipv6_sock_ac_close(struct sock *sk); 280 void ipv6_sock_ac_close(struct sock *sk); 281 282 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr); 283 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr); 284 void ipv6_ac_destroy_dev(struct inet6_dev *idev); 285 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev, 286 const struct in6_addr *addr); 287 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev, 288 const struct in6_addr *addr); 289 int ipv6_anycast_init(void); 290 void ipv6_anycast_cleanup(void); 291 292 /* Device notifier */ 293 int register_inet6addr_notifier(struct notifier_block *nb); 294 int unregister_inet6addr_notifier(struct notifier_block *nb); 295 int inet6addr_notifier_call_chain(unsigned long val, void *v); 296 297 int register_inet6addr_validator_notifier(struct notifier_block *nb); 298 int unregister_inet6addr_validator_notifier(struct notifier_block *nb); 299 int inet6addr_validator_notifier_call_chain(unsigned long val, void *v); 300 301 void inet6_netconf_notify_devconf(struct net *net, int event, int type, 302 int ifindex, struct ipv6_devconf *devconf); 303 304 /** 305 * __in6_dev_get - get inet6_dev pointer from netdevice 306 * @dev: network device 307 * 308 * Caller must hold rcu_read_lock or RTNL, because this function 309 * does not take a reference on the inet6_dev. 310 */ 311 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev) 312 { 313 return rcu_dereference_rtnl(dev->ip6_ptr); 314 } 315 316 /** 317 * __in6_dev_stats_get - get inet6_dev pointer for stats 318 * @dev: network device 319 * @skb: skb for original incoming interface if neeeded 320 * 321 * Caller must hold rcu_read_lock or RTNL, because this function 322 * does not take a reference on the inet6_dev. 323 */ 324 static inline struct inet6_dev *__in6_dev_stats_get(const struct net_device *dev, 325 const struct sk_buff *skb) 326 { 327 if (netif_is_l3_master(dev)) 328 dev = dev_get_by_index_rcu(dev_net(dev), inet6_iif(skb)); 329 return __in6_dev_get(dev); 330 } 331 332 /** 333 * __in6_dev_get_safely - get inet6_dev pointer from netdevice 334 * @dev: network device 335 * 336 * This is a safer version of __in6_dev_get 337 */ 338 static inline struct inet6_dev *__in6_dev_get_safely(const struct net_device *dev) 339 { 340 if (likely(dev)) 341 return rcu_dereference_rtnl(dev->ip6_ptr); 342 else 343 return NULL; 344 } 345 346 /** 347 * in6_dev_get - get inet6_dev pointer from netdevice 348 * @dev: network device 349 * 350 * This version can be used in any context, and takes a reference 351 * on the inet6_dev. Callers must use in6_dev_put() later to 352 * release this reference. 353 */ 354 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev) 355 { 356 struct inet6_dev *idev; 357 358 rcu_read_lock(); 359 idev = rcu_dereference(dev->ip6_ptr); 360 if (idev) 361 refcount_inc(&idev->refcnt); 362 rcu_read_unlock(); 363 return idev; 364 } 365 366 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev) 367 { 368 struct inet6_dev *idev = __in6_dev_get(dev); 369 370 return idev ? idev->nd_parms : NULL; 371 } 372 373 void in6_dev_finish_destroy(struct inet6_dev *idev); 374 375 static inline void in6_dev_put(struct inet6_dev *idev) 376 { 377 if (refcount_dec_and_test(&idev->refcnt)) 378 in6_dev_finish_destroy(idev); 379 } 380 381 static inline void in6_dev_put_clear(struct inet6_dev **pidev) 382 { 383 struct inet6_dev *idev = *pidev; 384 385 if (idev) { 386 in6_dev_put(idev); 387 *pidev = NULL; 388 } 389 } 390 391 static inline void __in6_dev_put(struct inet6_dev *idev) 392 { 393 refcount_dec(&idev->refcnt); 394 } 395 396 static inline void in6_dev_hold(struct inet6_dev *idev) 397 { 398 refcount_inc(&idev->refcnt); 399 } 400 401 /* called with rcu_read_lock held */ 402 static inline bool ip6_ignore_linkdown(const struct net_device *dev) 403 { 404 const struct inet6_dev *idev = __in6_dev_get(dev); 405 406 return !!idev->cnf.ignore_routes_with_linkdown; 407 } 408 409 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp); 410 411 static inline void in6_ifa_put(struct inet6_ifaddr *ifp) 412 { 413 if (refcount_dec_and_test(&ifp->refcnt)) 414 inet6_ifa_finish_destroy(ifp); 415 } 416 417 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp) 418 { 419 refcount_dec(&ifp->refcnt); 420 } 421 422 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp) 423 { 424 refcount_inc(&ifp->refcnt); 425 } 426 427 428 /* 429 * compute link-local solicited-node multicast address 430 */ 431 432 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr, 433 struct in6_addr *solicited) 434 { 435 ipv6_addr_set(solicited, 436 htonl(0xFF020000), 0, 437 htonl(0x1), 438 htonl(0xFF000000) | addr->s6_addr32[3]); 439 } 440 441 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr) 442 { 443 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 444 __be64 *p = (__force __be64 *)addr; 445 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL; 446 #else 447 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 448 addr->s6_addr32[1] | addr->s6_addr32[2] | 449 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0; 450 #endif 451 } 452 453 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr) 454 { 455 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 456 __be64 *p = (__force __be64 *)addr; 457 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL; 458 #else 459 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 460 addr->s6_addr32[1] | addr->s6_addr32[2] | 461 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0; 462 #endif 463 } 464 465 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr) 466 { 467 return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE); 468 } 469 470 static inline bool ipv6_addr_is_solict_mult(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)) | 475 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) & 476 cpu_to_be64(0xffffffffff000000UL))) == 0UL; 477 #else 478 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 479 addr->s6_addr32[1] | 480 (addr->s6_addr32[2] ^ htonl(0x00000001)) | 481 (addr->s6_addr[12] ^ 0xff)) == 0; 482 #endif 483 } 484 485 static inline bool ipv6_addr_is_all_snoopers(const struct in6_addr *addr) 486 { 487 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 488 __be64 *p = (__force __be64 *)addr; 489 490 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | 491 (p[1] ^ cpu_to_be64(0x6a))) == 0UL; 492 #else 493 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 494 addr->s6_addr32[1] | addr->s6_addr32[2] | 495 (addr->s6_addr32[3] ^ htonl(0x0000006a))) == 0; 496 #endif 497 } 498 499 #ifdef CONFIG_PROC_FS 500 int if6_proc_init(void); 501 void if6_proc_exit(void); 502 #endif 503 504 #endif 505