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 const struct in6_addr *peer_pfx; 68 69 u32 rt_priority; 70 u32 ifa_flags; 71 u32 preferred_lft; 72 u32 valid_lft; 73 u16 scope; 74 }; 75 76 int addrconf_init(void); 77 void addrconf_cleanup(void); 78 79 int addrconf_add_ifaddr(struct net *net, void __user *arg); 80 int addrconf_del_ifaddr(struct net *net, void __user *arg); 81 int addrconf_set_dstaddr(struct net *net, void __user *arg); 82 83 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 84 const struct net_device *dev, int strict); 85 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 86 const struct net_device *dev, bool skip_dev_check, 87 int strict, u32 banned_flags); 88 89 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 90 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr); 91 #endif 92 93 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 94 const unsigned int prefix_len, 95 struct net_device *dev); 96 97 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev); 98 99 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, 100 const struct in6_addr *addr, 101 struct net_device *dev, int strict); 102 103 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev, 104 const struct in6_addr *daddr, unsigned int srcprefs, 105 struct in6_addr *saddr); 106 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 107 u32 banned_flags); 108 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 109 u32 banned_flags); 110 bool inet_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2, 111 bool match_wildcard); 112 bool inet_rcv_saddr_any(const struct sock *sk); 113 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr); 114 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr); 115 116 void addrconf_add_linklocal(struct inet6_dev *idev, 117 const struct in6_addr *addr, u32 flags); 118 119 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 120 const struct prefix_info *pinfo, 121 struct inet6_dev *in6_dev, 122 const struct in6_addr *addr, int addr_type, 123 u32 addr_flags, bool sllao, bool tokenized, 124 __u32 valid_lft, u32 prefered_lft); 125 126 static inline void addrconf_addr_eui48_base(u8 *eui, const char *const addr) 127 { 128 memcpy(eui, addr, 3); 129 eui[3] = 0xFF; 130 eui[4] = 0xFE; 131 memcpy(eui + 5, addr + 3, 3); 132 } 133 134 static inline void addrconf_addr_eui48(u8 *eui, const char *const addr) 135 { 136 addrconf_addr_eui48_base(eui, addr); 137 eui[0] ^= 2; 138 } 139 140 static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 141 { 142 if (dev->addr_len != ETH_ALEN) 143 return -1; 144 145 /* 146 * The zSeries OSA network cards can be shared among various 147 * OS instances, but the OSA cards have only one MAC address. 148 * This leads to duplicate address conflicts in conjunction 149 * with IPv6 if more than one instance uses the same card. 150 * 151 * The driver for these cards can deliver a unique 16-bit 152 * identifier for each instance sharing the same card. It is 153 * placed instead of 0xFFFE in the interface identifier. The 154 * "u" bit of the interface identifier is not inverted in this 155 * case. Hence the resulting interface identifier has local 156 * scope according to RFC2373. 157 */ 158 159 addrconf_addr_eui48_base(eui, dev->dev_addr); 160 161 if (dev->dev_id) { 162 eui[3] = (dev->dev_id >> 8) & 0xFF; 163 eui[4] = dev->dev_id & 0xFF; 164 } else { 165 eui[0] ^= 2; 166 } 167 168 return 0; 169 } 170 171 static inline unsigned long addrconf_timeout_fixup(u32 timeout, 172 unsigned int unit) 173 { 174 if (timeout == 0xffffffff) 175 return ~0UL; 176 177 /* 178 * Avoid arithmetic overflow. 179 * Assuming unit is constant and non-zero, this "if" statement 180 * will go away on 64bit archs. 181 */ 182 if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit) 183 return LONG_MAX / unit; 184 185 return timeout; 186 } 187 188 static inline int addrconf_finite_timeout(unsigned long timeout) 189 { 190 return ~timeout; 191 } 192 193 /* 194 * IPv6 Address Label subsystem (addrlabel.c) 195 */ 196 int ipv6_addr_label_init(void); 197 void ipv6_addr_label_cleanup(void); 198 int ipv6_addr_label_rtnl_register(void); 199 u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr, 200 int type, int ifindex); 201 202 /* 203 * multicast prototypes (mcast.c) 204 */ 205 static inline int ipv6_mc_may_pull(struct sk_buff *skb, 206 unsigned int len) 207 { 208 if (skb_transport_offset(skb) + ipv6_transport_len(skb) < len) 209 return -EINVAL; 210 211 return pskb_may_pull(skb, len); 212 } 213 214 int ipv6_sock_mc_join(struct sock *sk, int ifindex, 215 const struct in6_addr *addr); 216 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, 217 const struct in6_addr *addr); 218 void __ipv6_sock_mc_close(struct sock *sk); 219 void ipv6_sock_mc_close(struct sock *sk); 220 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr, 221 const struct in6_addr *src_addr); 222 223 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr); 224 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr); 225 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr); 226 void ipv6_mc_up(struct inet6_dev *idev); 227 void ipv6_mc_down(struct inet6_dev *idev); 228 void ipv6_mc_unmap(struct inet6_dev *idev); 229 void ipv6_mc_remap(struct inet6_dev *idev); 230 void ipv6_mc_init_dev(struct inet6_dev *idev); 231 void ipv6_mc_destroy_dev(struct inet6_dev *idev); 232 int ipv6_mc_check_icmpv6(struct sk_buff *skb); 233 int ipv6_mc_check_mld(struct sk_buff *skb); 234 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp); 235 236 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, 237 const struct in6_addr *src_addr); 238 239 void ipv6_mc_dad_complete(struct inet6_dev *idev); 240 241 /* A stub used by vxlan module. This is ugly, ideally these 242 * symbols should be built into the core kernel. 243 */ 244 struct ipv6_stub { 245 int (*ipv6_sock_mc_join)(struct sock *sk, int ifindex, 246 const struct in6_addr *addr); 247 int (*ipv6_sock_mc_drop)(struct sock *sk, int ifindex, 248 const struct in6_addr *addr); 249 int (*ipv6_dst_lookup)(struct net *net, struct sock *sk, 250 struct dst_entry **dst, struct flowi6 *fl6); 251 252 struct fib6_table *(*fib6_get_table)(struct net *net, u32 id); 253 struct fib6_info *(*fib6_lookup)(struct net *net, int oif, 254 struct flowi6 *fl6, int flags); 255 struct fib6_info *(*fib6_table_lookup)(struct net *net, 256 struct fib6_table *table, 257 int oif, struct flowi6 *fl6, 258 int flags); 259 struct fib6_info *(*fib6_multipath_select)(const struct net *net, 260 struct fib6_info *f6i, 261 struct flowi6 *fl6, int oif, 262 const struct sk_buff *skb, 263 int strict); 264 u32 (*ip6_mtu_from_fib6)(struct fib6_info *f6i, struct in6_addr *daddr, 265 struct in6_addr *saddr); 266 267 void (*udpv6_encap_enable)(void); 268 void (*ndisc_send_na)(struct net_device *dev, const struct in6_addr *daddr, 269 const struct in6_addr *solicited_addr, 270 bool router, bool solicited, bool override, bool inc_opt); 271 struct neigh_table *nd_tbl; 272 }; 273 extern const struct ipv6_stub *ipv6_stub __read_mostly; 274 275 /* A stub used by bpf helpers. Similarly ugly as ipv6_stub */ 276 struct ipv6_bpf_stub { 277 int (*inet6_bind)(struct sock *sk, struct sockaddr *uaddr, int addr_len, 278 bool force_bind_address_no_port, bool with_lock); 279 struct sock *(*udp6_lib_lookup)(struct net *net, 280 const struct in6_addr *saddr, __be16 sport, 281 const struct in6_addr *daddr, __be16 dport, 282 int dif, int sdif, struct udp_table *tbl, 283 struct sk_buff *skb); 284 }; 285 extern const struct ipv6_bpf_stub *ipv6_bpf_stub __read_mostly; 286 287 /* 288 * identify MLD packets for MLD filter exceptions 289 */ 290 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset) 291 { 292 struct icmp6hdr *hdr; 293 294 if (nexthdr != IPPROTO_ICMPV6 || 295 !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr))) 296 return false; 297 298 hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset); 299 300 switch (hdr->icmp6_type) { 301 case ICMPV6_MGM_QUERY: 302 case ICMPV6_MGM_REPORT: 303 case ICMPV6_MGM_REDUCTION: 304 case ICMPV6_MLD2_REPORT: 305 return true; 306 default: 307 break; 308 } 309 return false; 310 } 311 312 void addrconf_prefix_rcv(struct net_device *dev, 313 u8 *opt, int len, bool sllao); 314 315 /* 316 * anycast prototypes (anycast.c) 317 */ 318 int ipv6_sock_ac_join(struct sock *sk, int ifindex, 319 const struct in6_addr *addr); 320 int ipv6_sock_ac_drop(struct sock *sk, int ifindex, 321 const struct in6_addr *addr); 322 void ipv6_sock_ac_close(struct sock *sk); 323 324 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr); 325 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr); 326 void ipv6_ac_destroy_dev(struct inet6_dev *idev); 327 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev, 328 const struct in6_addr *addr); 329 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev, 330 const struct in6_addr *addr); 331 int ipv6_anycast_init(void); 332 void ipv6_anycast_cleanup(void); 333 334 /* Device notifier */ 335 int register_inet6addr_notifier(struct notifier_block *nb); 336 int unregister_inet6addr_notifier(struct notifier_block *nb); 337 int inet6addr_notifier_call_chain(unsigned long val, void *v); 338 339 int register_inet6addr_validator_notifier(struct notifier_block *nb); 340 int unregister_inet6addr_validator_notifier(struct notifier_block *nb); 341 int inet6addr_validator_notifier_call_chain(unsigned long val, void *v); 342 343 void inet6_netconf_notify_devconf(struct net *net, int event, int type, 344 int ifindex, struct ipv6_devconf *devconf); 345 346 /** 347 * __in6_dev_get - get inet6_dev pointer from netdevice 348 * @dev: network device 349 * 350 * Caller must hold rcu_read_lock or RTNL, because this function 351 * does not take a reference on the inet6_dev. 352 */ 353 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev) 354 { 355 return rcu_dereference_rtnl(dev->ip6_ptr); 356 } 357 358 /** 359 * __in6_dev_get_safely - get inet6_dev pointer from netdevice 360 * @dev: network device 361 * 362 * This is a safer version of __in6_dev_get 363 */ 364 static inline struct inet6_dev *__in6_dev_get_safely(const struct net_device *dev) 365 { 366 if (likely(dev)) 367 return rcu_dereference_rtnl(dev->ip6_ptr); 368 else 369 return NULL; 370 } 371 372 /** 373 * in6_dev_get - get inet6_dev pointer from netdevice 374 * @dev: network device 375 * 376 * This version can be used in any context, and takes a reference 377 * on the inet6_dev. Callers must use in6_dev_put() later to 378 * release this reference. 379 */ 380 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev) 381 { 382 struct inet6_dev *idev; 383 384 rcu_read_lock(); 385 idev = rcu_dereference(dev->ip6_ptr); 386 if (idev) 387 refcount_inc(&idev->refcnt); 388 rcu_read_unlock(); 389 return idev; 390 } 391 392 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev) 393 { 394 struct inet6_dev *idev = __in6_dev_get(dev); 395 396 return idev ? idev->nd_parms : NULL; 397 } 398 399 void in6_dev_finish_destroy(struct inet6_dev *idev); 400 401 static inline void in6_dev_put(struct inet6_dev *idev) 402 { 403 if (refcount_dec_and_test(&idev->refcnt)) 404 in6_dev_finish_destroy(idev); 405 } 406 407 static inline void in6_dev_put_clear(struct inet6_dev **pidev) 408 { 409 struct inet6_dev *idev = *pidev; 410 411 if (idev) { 412 in6_dev_put(idev); 413 *pidev = NULL; 414 } 415 } 416 417 static inline void __in6_dev_put(struct inet6_dev *idev) 418 { 419 refcount_dec(&idev->refcnt); 420 } 421 422 static inline void in6_dev_hold(struct inet6_dev *idev) 423 { 424 refcount_inc(&idev->refcnt); 425 } 426 427 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp); 428 429 static inline void in6_ifa_put(struct inet6_ifaddr *ifp) 430 { 431 if (refcount_dec_and_test(&ifp->refcnt)) 432 inet6_ifa_finish_destroy(ifp); 433 } 434 435 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp) 436 { 437 refcount_dec(&ifp->refcnt); 438 } 439 440 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp) 441 { 442 refcount_inc(&ifp->refcnt); 443 } 444 445 446 /* 447 * compute link-local solicited-node multicast address 448 */ 449 450 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr, 451 struct in6_addr *solicited) 452 { 453 ipv6_addr_set(solicited, 454 htonl(0xFF020000), 0, 455 htonl(0x1), 456 htonl(0xFF000000) | addr->s6_addr32[3]); 457 } 458 459 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr) 460 { 461 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 462 __be64 *p = (__be64 *)addr; 463 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL; 464 #else 465 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 466 addr->s6_addr32[1] | addr->s6_addr32[2] | 467 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0; 468 #endif 469 } 470 471 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr) 472 { 473 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 474 __be64 *p = (__be64 *)addr; 475 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL; 476 #else 477 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 478 addr->s6_addr32[1] | addr->s6_addr32[2] | 479 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0; 480 #endif 481 } 482 483 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr) 484 { 485 return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE); 486 } 487 488 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr) 489 { 490 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 491 __be64 *p = (__be64 *)addr; 492 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | 493 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) & 494 cpu_to_be64(0xffffffffff000000UL))) == 0UL; 495 #else 496 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 497 addr->s6_addr32[1] | 498 (addr->s6_addr32[2] ^ htonl(0x00000001)) | 499 (addr->s6_addr[12] ^ 0xff)) == 0; 500 #endif 501 } 502 503 static inline bool ipv6_addr_is_all_snoopers(const struct in6_addr *addr) 504 { 505 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 506 __be64 *p = (__be64 *)addr; 507 508 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | 509 (p[1] ^ cpu_to_be64(0x6a))) == 0UL; 510 #else 511 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 512 addr->s6_addr32[1] | addr->s6_addr32[2] | 513 (addr->s6_addr32[3] ^ htonl(0x0000006a))) == 0; 514 #endif 515 } 516 517 #ifdef CONFIG_PROC_FS 518 int if6_proc_init(void); 519 void if6_proc_exit(void); 520 #endif 521 522 #endif 523