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 inet6_ifaddr *ipv6_get_ifaddr(struct net *net, 101 const struct in6_addr *addr, 102 struct net_device *dev, int strict); 103 104 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev, 105 const struct in6_addr *daddr, unsigned int srcprefs, 106 struct in6_addr *saddr); 107 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 108 u32 banned_flags); 109 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 110 u32 banned_flags); 111 bool inet_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2, 112 bool match_wildcard); 113 bool inet_rcv_saddr_any(const struct sock *sk); 114 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr); 115 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr); 116 117 void addrconf_add_linklocal(struct inet6_dev *idev, 118 const struct in6_addr *addr, u32 flags); 119 120 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 121 const struct prefix_info *pinfo, 122 struct inet6_dev *in6_dev, 123 const struct in6_addr *addr, int addr_type, 124 u32 addr_flags, bool sllao, bool tokenized, 125 __u32 valid_lft, u32 prefered_lft); 126 127 static inline void addrconf_addr_eui48_base(u8 *eui, const char *const addr) 128 { 129 memcpy(eui, addr, 3); 130 eui[3] = 0xFF; 131 eui[4] = 0xFE; 132 memcpy(eui + 5, addr + 3, 3); 133 } 134 135 static inline void addrconf_addr_eui48(u8 *eui, const char *const addr) 136 { 137 addrconf_addr_eui48_base(eui, addr); 138 eui[0] ^= 2; 139 } 140 141 static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 142 { 143 if (dev->addr_len != ETH_ALEN) 144 return -1; 145 146 /* 147 * The zSeries OSA network cards can be shared among various 148 * OS instances, but the OSA cards have only one MAC address. 149 * This leads to duplicate address conflicts in conjunction 150 * with IPv6 if more than one instance uses the same card. 151 * 152 * The driver for these cards can deliver a unique 16-bit 153 * identifier for each instance sharing the same card. It is 154 * placed instead of 0xFFFE in the interface identifier. The 155 * "u" bit of the interface identifier is not inverted in this 156 * case. Hence the resulting interface identifier has local 157 * scope according to RFC2373. 158 */ 159 160 addrconf_addr_eui48_base(eui, dev->dev_addr); 161 162 if (dev->dev_id) { 163 eui[3] = (dev->dev_id >> 8) & 0xFF; 164 eui[4] = dev->dev_id & 0xFF; 165 } else { 166 eui[0] ^= 2; 167 } 168 169 return 0; 170 } 171 172 static inline unsigned long addrconf_timeout_fixup(u32 timeout, 173 unsigned int unit) 174 { 175 if (timeout == 0xffffffff) 176 return ~0UL; 177 178 /* 179 * Avoid arithmetic overflow. 180 * Assuming unit is constant and non-zero, this "if" statement 181 * will go away on 64bit archs. 182 */ 183 if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit) 184 return LONG_MAX / unit; 185 186 return timeout; 187 } 188 189 static inline int addrconf_finite_timeout(unsigned long timeout) 190 { 191 return ~timeout; 192 } 193 194 /* 195 * IPv6 Address Label subsystem (addrlabel.c) 196 */ 197 int ipv6_addr_label_init(void); 198 void ipv6_addr_label_cleanup(void); 199 int ipv6_addr_label_rtnl_register(void); 200 u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr, 201 int type, int ifindex); 202 203 /* 204 * multicast prototypes (mcast.c) 205 */ 206 static inline bool ipv6_mc_may_pull(struct sk_buff *skb, 207 unsigned int len) 208 { 209 if (skb_transport_offset(skb) + ipv6_transport_len(skb) < len) 210 return false; 211 212 return pskb_may_pull(skb, len); 213 } 214 215 int ipv6_sock_mc_join(struct sock *sk, int ifindex, 216 const struct in6_addr *addr); 217 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, 218 const struct in6_addr *addr); 219 void __ipv6_sock_mc_close(struct sock *sk); 220 void ipv6_sock_mc_close(struct sock *sk); 221 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr, 222 const struct in6_addr *src_addr); 223 224 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr); 225 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr); 226 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr); 227 void ipv6_mc_up(struct inet6_dev *idev); 228 void ipv6_mc_down(struct inet6_dev *idev); 229 void ipv6_mc_unmap(struct inet6_dev *idev); 230 void ipv6_mc_remap(struct inet6_dev *idev); 231 void ipv6_mc_init_dev(struct inet6_dev *idev); 232 void ipv6_mc_destroy_dev(struct inet6_dev *idev); 233 int ipv6_mc_check_icmpv6(struct sk_buff *skb); 234 int ipv6_mc_check_mld(struct sk_buff *skb); 235 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp); 236 237 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, 238 const struct in6_addr *src_addr); 239 240 void ipv6_mc_dad_complete(struct inet6_dev *idev); 241 242 /* 243 * identify MLD packets for MLD filter exceptions 244 */ 245 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset) 246 { 247 struct icmp6hdr *hdr; 248 249 if (nexthdr != IPPROTO_ICMPV6 || 250 !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr))) 251 return false; 252 253 hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset); 254 255 switch (hdr->icmp6_type) { 256 case ICMPV6_MGM_QUERY: 257 case ICMPV6_MGM_REPORT: 258 case ICMPV6_MGM_REDUCTION: 259 case ICMPV6_MLD2_REPORT: 260 return true; 261 default: 262 break; 263 } 264 return false; 265 } 266 267 void addrconf_prefix_rcv(struct net_device *dev, 268 u8 *opt, int len, bool sllao); 269 270 /* 271 * anycast prototypes (anycast.c) 272 */ 273 int ipv6_sock_ac_join(struct sock *sk, int ifindex, 274 const struct in6_addr *addr); 275 int ipv6_sock_ac_drop(struct sock *sk, int ifindex, 276 const struct in6_addr *addr); 277 void ipv6_sock_ac_close(struct sock *sk); 278 279 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr); 280 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr); 281 void ipv6_ac_destroy_dev(struct inet6_dev *idev); 282 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev, 283 const struct in6_addr *addr); 284 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev, 285 const struct in6_addr *addr); 286 int ipv6_anycast_init(void); 287 void ipv6_anycast_cleanup(void); 288 289 /* Device notifier */ 290 int register_inet6addr_notifier(struct notifier_block *nb); 291 int unregister_inet6addr_notifier(struct notifier_block *nb); 292 int inet6addr_notifier_call_chain(unsigned long val, void *v); 293 294 int register_inet6addr_validator_notifier(struct notifier_block *nb); 295 int unregister_inet6addr_validator_notifier(struct notifier_block *nb); 296 int inet6addr_validator_notifier_call_chain(unsigned long val, void *v); 297 298 void inet6_netconf_notify_devconf(struct net *net, int event, int type, 299 int ifindex, struct ipv6_devconf *devconf); 300 301 /** 302 * __in6_dev_get - get inet6_dev pointer from netdevice 303 * @dev: network device 304 * 305 * Caller must hold rcu_read_lock or RTNL, because this function 306 * does not take a reference on the inet6_dev. 307 */ 308 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev) 309 { 310 return rcu_dereference_rtnl(dev->ip6_ptr); 311 } 312 313 /** 314 * __in6_dev_stats_get - get inet6_dev pointer for stats 315 * @dev: network device 316 * @skb: skb for original incoming interface if neeeded 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_stats_get(const struct net_device *dev, 322 const struct sk_buff *skb) 323 { 324 if (netif_is_l3_master(dev)) 325 dev = dev_get_by_index_rcu(dev_net(dev), inet6_iif(skb)); 326 return __in6_dev_get(dev); 327 } 328 329 /** 330 * __in6_dev_get_safely - get inet6_dev pointer from netdevice 331 * @dev: network device 332 * 333 * This is a safer version of __in6_dev_get 334 */ 335 static inline struct inet6_dev *__in6_dev_get_safely(const struct net_device *dev) 336 { 337 if (likely(dev)) 338 return rcu_dereference_rtnl(dev->ip6_ptr); 339 else 340 return NULL; 341 } 342 343 /** 344 * in6_dev_get - get inet6_dev pointer from netdevice 345 * @dev: network device 346 * 347 * This version can be used in any context, and takes a reference 348 * on the inet6_dev. Callers must use in6_dev_put() later to 349 * release this reference. 350 */ 351 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev) 352 { 353 struct inet6_dev *idev; 354 355 rcu_read_lock(); 356 idev = rcu_dereference(dev->ip6_ptr); 357 if (idev) 358 refcount_inc(&idev->refcnt); 359 rcu_read_unlock(); 360 return idev; 361 } 362 363 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev) 364 { 365 struct inet6_dev *idev = __in6_dev_get(dev); 366 367 return idev ? idev->nd_parms : NULL; 368 } 369 370 void in6_dev_finish_destroy(struct inet6_dev *idev); 371 372 static inline void in6_dev_put(struct inet6_dev *idev) 373 { 374 if (refcount_dec_and_test(&idev->refcnt)) 375 in6_dev_finish_destroy(idev); 376 } 377 378 static inline void in6_dev_put_clear(struct inet6_dev **pidev) 379 { 380 struct inet6_dev *idev = *pidev; 381 382 if (idev) { 383 in6_dev_put(idev); 384 *pidev = NULL; 385 } 386 } 387 388 static inline void __in6_dev_put(struct inet6_dev *idev) 389 { 390 refcount_dec(&idev->refcnt); 391 } 392 393 static inline void in6_dev_hold(struct inet6_dev *idev) 394 { 395 refcount_inc(&idev->refcnt); 396 } 397 398 /* called with rcu_read_lock held */ 399 static inline bool ip6_ignore_linkdown(const struct net_device *dev) 400 { 401 const struct inet6_dev *idev = __in6_dev_get(dev); 402 403 return !!idev->cnf.ignore_routes_with_linkdown; 404 } 405 406 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp); 407 408 static inline void in6_ifa_put(struct inet6_ifaddr *ifp) 409 { 410 if (refcount_dec_and_test(&ifp->refcnt)) 411 inet6_ifa_finish_destroy(ifp); 412 } 413 414 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp) 415 { 416 refcount_dec(&ifp->refcnt); 417 } 418 419 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp) 420 { 421 refcount_inc(&ifp->refcnt); 422 } 423 424 425 /* 426 * compute link-local solicited-node multicast address 427 */ 428 429 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr, 430 struct in6_addr *solicited) 431 { 432 ipv6_addr_set(solicited, 433 htonl(0xFF020000), 0, 434 htonl(0x1), 435 htonl(0xFF000000) | addr->s6_addr32[3]); 436 } 437 438 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr) 439 { 440 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 441 __be64 *p = (__force __be64 *)addr; 442 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL; 443 #else 444 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 445 addr->s6_addr32[1] | addr->s6_addr32[2] | 446 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0; 447 #endif 448 } 449 450 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr) 451 { 452 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 453 __be64 *p = (__force __be64 *)addr; 454 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL; 455 #else 456 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 457 addr->s6_addr32[1] | addr->s6_addr32[2] | 458 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0; 459 #endif 460 } 461 462 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr) 463 { 464 return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE); 465 } 466 467 static inline bool ipv6_addr_is_solict_mult(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)) | 472 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) & 473 cpu_to_be64(0xffffffffff000000UL))) == 0UL; 474 #else 475 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 476 addr->s6_addr32[1] | 477 (addr->s6_addr32[2] ^ htonl(0x00000001)) | 478 (addr->s6_addr[12] ^ 0xff)) == 0; 479 #endif 480 } 481 482 static inline bool ipv6_addr_is_all_snoopers(const struct in6_addr *addr) 483 { 484 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 485 __be64 *p = (__force __be64 *)addr; 486 487 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | 488 (p[1] ^ cpu_to_be64(0x6a))) == 0UL; 489 #else 490 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 491 addr->s6_addr32[1] | addr->s6_addr32[2] | 492 (addr->s6_addr32[3] ^ htonl(0x0000006a))) == 0; 493 #endif 494 } 495 496 #ifdef CONFIG_PROC_FS 497 int if6_proc_init(void); 498 void if6_proc_exit(void); 499 #endif 500 501 #endif 502