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/netdevice.h> 53 #include <net/if_inet6.h> 54 #include <net/ipv6.h> 55 56 struct in6_validator_info { 57 struct in6_addr i6vi_addr; 58 struct inet6_dev *i6vi_dev; 59 struct netlink_ext_ack *extack; 60 }; 61 62 struct ifa6_config { 63 const struct in6_addr *pfx; 64 unsigned int plen; 65 66 const struct in6_addr *peer_pfx; 67 68 u32 rt_priority; 69 u32 ifa_flags; 70 u32 preferred_lft; 71 u32 valid_lft; 72 u16 scope; 73 }; 74 75 int addrconf_init(void); 76 void addrconf_cleanup(void); 77 78 int addrconf_add_ifaddr(struct net *net, void __user *arg); 79 int addrconf_del_ifaddr(struct net *net, void __user *arg); 80 int addrconf_set_dstaddr(struct net *net, void __user *arg); 81 82 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 83 const struct net_device *dev, int strict); 84 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 85 const struct net_device *dev, bool skip_dev_check, 86 int strict, u32 banned_flags); 87 88 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 89 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr); 90 #endif 91 92 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 93 const unsigned int prefix_len, 94 struct net_device *dev); 95 96 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev); 97 98 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, 99 const struct in6_addr *addr, 100 struct net_device *dev, int strict); 101 102 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev, 103 const struct in6_addr *daddr, unsigned int srcprefs, 104 struct in6_addr *saddr); 105 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 106 u32 banned_flags); 107 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 108 u32 banned_flags); 109 bool inet_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2, 110 bool match_wildcard); 111 bool inet_rcv_saddr_any(const struct sock *sk); 112 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr); 113 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr); 114 115 void addrconf_add_linklocal(struct inet6_dev *idev, 116 const struct in6_addr *addr, u32 flags); 117 118 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 119 const struct prefix_info *pinfo, 120 struct inet6_dev *in6_dev, 121 const struct in6_addr *addr, int addr_type, 122 u32 addr_flags, bool sllao, bool tokenized, 123 __u32 valid_lft, u32 prefered_lft); 124 125 static inline void addrconf_addr_eui48_base(u8 *eui, const char *const addr) 126 { 127 memcpy(eui, addr, 3); 128 eui[3] = 0xFF; 129 eui[4] = 0xFE; 130 memcpy(eui + 5, addr + 3, 3); 131 } 132 133 static inline void addrconf_addr_eui48(u8 *eui, const char *const addr) 134 { 135 addrconf_addr_eui48_base(eui, addr); 136 eui[0] ^= 2; 137 } 138 139 static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 140 { 141 if (dev->addr_len != ETH_ALEN) 142 return -1; 143 144 /* 145 * The zSeries OSA network cards can be shared among various 146 * OS instances, but the OSA cards have only one MAC address. 147 * This leads to duplicate address conflicts in conjunction 148 * with IPv6 if more than one instance uses the same card. 149 * 150 * The driver for these cards can deliver a unique 16-bit 151 * identifier for each instance sharing the same card. It is 152 * placed instead of 0xFFFE in the interface identifier. The 153 * "u" bit of the interface identifier is not inverted in this 154 * case. Hence the resulting interface identifier has local 155 * scope according to RFC2373. 156 */ 157 158 addrconf_addr_eui48_base(eui, dev->dev_addr); 159 160 if (dev->dev_id) { 161 eui[3] = (dev->dev_id >> 8) & 0xFF; 162 eui[4] = dev->dev_id & 0xFF; 163 } else { 164 eui[0] ^= 2; 165 } 166 167 return 0; 168 } 169 170 static inline unsigned long addrconf_timeout_fixup(u32 timeout, 171 unsigned int unit) 172 { 173 if (timeout == 0xffffffff) 174 return ~0UL; 175 176 /* 177 * Avoid arithmetic overflow. 178 * Assuming unit is constant and non-zero, this "if" statement 179 * will go away on 64bit archs. 180 */ 181 if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit) 182 return LONG_MAX / unit; 183 184 return timeout; 185 } 186 187 static inline int addrconf_finite_timeout(unsigned long timeout) 188 { 189 return ~timeout; 190 } 191 192 /* 193 * IPv6 Address Label subsystem (addrlabel.c) 194 */ 195 int ipv6_addr_label_init(void); 196 void ipv6_addr_label_cleanup(void); 197 int ipv6_addr_label_rtnl_register(void); 198 u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr, 199 int type, int ifindex); 200 201 /* 202 * multicast prototypes (mcast.c) 203 */ 204 int ipv6_sock_mc_join(struct sock *sk, int ifindex, 205 const struct in6_addr *addr); 206 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, 207 const struct in6_addr *addr); 208 void __ipv6_sock_mc_close(struct sock *sk); 209 void ipv6_sock_mc_close(struct sock *sk); 210 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr, 211 const struct in6_addr *src_addr); 212 213 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr); 214 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr); 215 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr); 216 void ipv6_mc_up(struct inet6_dev *idev); 217 void ipv6_mc_down(struct inet6_dev *idev); 218 void ipv6_mc_unmap(struct inet6_dev *idev); 219 void ipv6_mc_remap(struct inet6_dev *idev); 220 void ipv6_mc_init_dev(struct inet6_dev *idev); 221 void ipv6_mc_destroy_dev(struct inet6_dev *idev); 222 int ipv6_mc_check_mld(struct sk_buff *skb, struct sk_buff **skb_trimmed); 223 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp); 224 225 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, 226 const struct in6_addr *src_addr); 227 228 void ipv6_mc_dad_complete(struct inet6_dev *idev); 229 230 /* A stub used by vxlan module. This is ugly, ideally these 231 * symbols should be built into the core kernel. 232 */ 233 struct ipv6_stub { 234 int (*ipv6_sock_mc_join)(struct sock *sk, int ifindex, 235 const struct in6_addr *addr); 236 int (*ipv6_sock_mc_drop)(struct sock *sk, int ifindex, 237 const struct in6_addr *addr); 238 int (*ipv6_dst_lookup)(struct net *net, struct sock *sk, 239 struct dst_entry **dst, struct flowi6 *fl6); 240 241 struct fib6_table *(*fib6_get_table)(struct net *net, u32 id); 242 struct fib6_info *(*fib6_lookup)(struct net *net, int oif, 243 struct flowi6 *fl6, int flags); 244 struct fib6_info *(*fib6_table_lookup)(struct net *net, 245 struct fib6_table *table, 246 int oif, struct flowi6 *fl6, 247 int flags); 248 struct fib6_info *(*fib6_multipath_select)(const struct net *net, 249 struct fib6_info *f6i, 250 struct flowi6 *fl6, int oif, 251 const struct sk_buff *skb, 252 int strict); 253 u32 (*ip6_mtu_from_fib6)(struct fib6_info *f6i, struct in6_addr *daddr, 254 struct in6_addr *saddr); 255 256 void (*udpv6_encap_enable)(void); 257 void (*ndisc_send_na)(struct net_device *dev, const struct in6_addr *daddr, 258 const struct in6_addr *solicited_addr, 259 bool router, bool solicited, bool override, bool inc_opt); 260 struct neigh_table *nd_tbl; 261 }; 262 extern const struct ipv6_stub *ipv6_stub __read_mostly; 263 264 /* A stub used by bpf helpers. Similarly ugly as ipv6_stub */ 265 struct ipv6_bpf_stub { 266 int (*inet6_bind)(struct sock *sk, struct sockaddr *uaddr, int addr_len, 267 bool force_bind_address_no_port, bool with_lock); 268 struct sock *(*udp6_lib_lookup)(struct net *net, 269 const struct in6_addr *saddr, __be16 sport, 270 const struct in6_addr *daddr, __be16 dport, 271 int dif, int sdif, struct udp_table *tbl, 272 struct sk_buff *skb); 273 }; 274 extern const struct ipv6_bpf_stub *ipv6_bpf_stub __read_mostly; 275 276 /* 277 * identify MLD packets for MLD filter exceptions 278 */ 279 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset) 280 { 281 struct icmp6hdr *hdr; 282 283 if (nexthdr != IPPROTO_ICMPV6 || 284 !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr))) 285 return false; 286 287 hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset); 288 289 switch (hdr->icmp6_type) { 290 case ICMPV6_MGM_QUERY: 291 case ICMPV6_MGM_REPORT: 292 case ICMPV6_MGM_REDUCTION: 293 case ICMPV6_MLD2_REPORT: 294 return true; 295 default: 296 break; 297 } 298 return false; 299 } 300 301 void addrconf_prefix_rcv(struct net_device *dev, 302 u8 *opt, int len, bool sllao); 303 304 /* 305 * anycast prototypes (anycast.c) 306 */ 307 int ipv6_sock_ac_join(struct sock *sk, int ifindex, 308 const struct in6_addr *addr); 309 int ipv6_sock_ac_drop(struct sock *sk, int ifindex, 310 const struct in6_addr *addr); 311 void ipv6_sock_ac_close(struct sock *sk); 312 313 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr); 314 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr); 315 void ipv6_ac_destroy_dev(struct inet6_dev *idev); 316 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev, 317 const struct in6_addr *addr); 318 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev, 319 const struct in6_addr *addr); 320 321 /* Device notifier */ 322 int register_inet6addr_notifier(struct notifier_block *nb); 323 int unregister_inet6addr_notifier(struct notifier_block *nb); 324 int inet6addr_notifier_call_chain(unsigned long val, void *v); 325 326 int register_inet6addr_validator_notifier(struct notifier_block *nb); 327 int unregister_inet6addr_validator_notifier(struct notifier_block *nb); 328 int inet6addr_validator_notifier_call_chain(unsigned long val, void *v); 329 330 void inet6_netconf_notify_devconf(struct net *net, int event, int type, 331 int ifindex, struct ipv6_devconf *devconf); 332 333 /** 334 * __in6_dev_get - get inet6_dev pointer from netdevice 335 * @dev: network device 336 * 337 * Caller must hold rcu_read_lock or RTNL, because this function 338 * does not take a reference on the inet6_dev. 339 */ 340 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev) 341 { 342 return rcu_dereference_rtnl(dev->ip6_ptr); 343 } 344 345 /** 346 * __in6_dev_get_safely - get inet6_dev pointer from netdevice 347 * @dev: network device 348 * 349 * This is a safer version of __in6_dev_get 350 */ 351 static inline struct inet6_dev *__in6_dev_get_safely(const struct net_device *dev) 352 { 353 if (likely(dev)) 354 return rcu_dereference_rtnl(dev->ip6_ptr); 355 else 356 return NULL; 357 } 358 359 /** 360 * in6_dev_get - get inet6_dev pointer from netdevice 361 * @dev: network device 362 * 363 * This version can be used in any context, and takes a reference 364 * on the inet6_dev. Callers must use in6_dev_put() later to 365 * release this reference. 366 */ 367 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev) 368 { 369 struct inet6_dev *idev; 370 371 rcu_read_lock(); 372 idev = rcu_dereference(dev->ip6_ptr); 373 if (idev) 374 refcount_inc(&idev->refcnt); 375 rcu_read_unlock(); 376 return idev; 377 } 378 379 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev) 380 { 381 struct inet6_dev *idev = __in6_dev_get(dev); 382 383 return idev ? idev->nd_parms : NULL; 384 } 385 386 void in6_dev_finish_destroy(struct inet6_dev *idev); 387 388 static inline void in6_dev_put(struct inet6_dev *idev) 389 { 390 if (refcount_dec_and_test(&idev->refcnt)) 391 in6_dev_finish_destroy(idev); 392 } 393 394 static inline void in6_dev_put_clear(struct inet6_dev **pidev) 395 { 396 struct inet6_dev *idev = *pidev; 397 398 if (idev) { 399 in6_dev_put(idev); 400 *pidev = NULL; 401 } 402 } 403 404 static inline void __in6_dev_put(struct inet6_dev *idev) 405 { 406 refcount_dec(&idev->refcnt); 407 } 408 409 static inline void in6_dev_hold(struct inet6_dev *idev) 410 { 411 refcount_inc(&idev->refcnt); 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 = (__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 = (__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 = (__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 #ifdef CONFIG_PROC_FS 491 int if6_proc_init(void); 492 void if6_proc_exit(void); 493 #endif 494 495 #endif 496