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