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 #define IN6_ADDR_HSIZE_SHIFT 8 63 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT) 64 65 int addrconf_init(void); 66 void addrconf_cleanup(void); 67 68 int addrconf_add_ifaddr(struct net *net, void __user *arg); 69 int addrconf_del_ifaddr(struct net *net, void __user *arg); 70 int addrconf_set_dstaddr(struct net *net, void __user *arg); 71 72 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 73 const struct net_device *dev, int strict); 74 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 75 const struct net_device *dev, int strict, 76 u32 banned_flags); 77 78 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 79 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr); 80 #endif 81 82 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 83 const unsigned int prefix_len, 84 struct net_device *dev); 85 86 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev); 87 88 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, 89 const struct in6_addr *addr, 90 struct net_device *dev, int strict); 91 92 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev, 93 const struct in6_addr *daddr, unsigned int srcprefs, 94 struct in6_addr *saddr); 95 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 96 u32 banned_flags); 97 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 98 u32 banned_flags); 99 bool inet_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2, 100 bool match_wildcard); 101 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr); 102 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr); 103 104 void addrconf_add_linklocal(struct inet6_dev *idev, 105 const struct in6_addr *addr, u32 flags); 106 107 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 108 const struct prefix_info *pinfo, 109 struct inet6_dev *in6_dev, 110 const struct in6_addr *addr, int addr_type, 111 u32 addr_flags, bool sllao, bool tokenized, 112 __u32 valid_lft, u32 prefered_lft); 113 114 static inline void addrconf_addr_eui48_base(u8 *eui, const char *const addr) 115 { 116 memcpy(eui, addr, 3); 117 eui[3] = 0xFF; 118 eui[4] = 0xFE; 119 memcpy(eui + 5, addr + 3, 3); 120 } 121 122 static inline void addrconf_addr_eui48(u8 *eui, const char *const addr) 123 { 124 addrconf_addr_eui48_base(eui, addr); 125 eui[0] ^= 2; 126 } 127 128 static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 129 { 130 if (dev->addr_len != ETH_ALEN) 131 return -1; 132 133 /* 134 * The zSeries OSA network cards can be shared among various 135 * OS instances, but the OSA cards have only one MAC address. 136 * This leads to duplicate address conflicts in conjunction 137 * with IPv6 if more than one instance uses the same card. 138 * 139 * The driver for these cards can deliver a unique 16-bit 140 * identifier for each instance sharing the same card. It is 141 * placed instead of 0xFFFE in the interface identifier. The 142 * "u" bit of the interface identifier is not inverted in this 143 * case. Hence the resulting interface identifier has local 144 * scope according to RFC2373. 145 */ 146 147 addrconf_addr_eui48_base(eui, dev->dev_addr); 148 149 if (dev->dev_id) { 150 eui[3] = (dev->dev_id >> 8) & 0xFF; 151 eui[4] = dev->dev_id & 0xFF; 152 } else { 153 eui[0] ^= 2; 154 } 155 156 return 0; 157 } 158 159 static inline unsigned long addrconf_timeout_fixup(u32 timeout, 160 unsigned int unit) 161 { 162 if (timeout == 0xffffffff) 163 return ~0UL; 164 165 /* 166 * Avoid arithmetic overflow. 167 * Assuming unit is constant and non-zero, this "if" statement 168 * will go away on 64bit archs. 169 */ 170 if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit) 171 return LONG_MAX / unit; 172 173 return timeout; 174 } 175 176 static inline int addrconf_finite_timeout(unsigned long timeout) 177 { 178 return ~timeout; 179 } 180 181 /* 182 * IPv6 Address Label subsystem (addrlabel.c) 183 */ 184 int ipv6_addr_label_init(void); 185 void ipv6_addr_label_cleanup(void); 186 void ipv6_addr_label_rtnl_register(void); 187 u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr, 188 int type, int ifindex); 189 190 /* 191 * multicast prototypes (mcast.c) 192 */ 193 int ipv6_sock_mc_join(struct sock *sk, int ifindex, 194 const struct in6_addr *addr); 195 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, 196 const struct in6_addr *addr); 197 void __ipv6_sock_mc_close(struct sock *sk); 198 void ipv6_sock_mc_close(struct sock *sk); 199 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr, 200 const struct in6_addr *src_addr); 201 202 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr); 203 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr); 204 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr); 205 void ipv6_mc_up(struct inet6_dev *idev); 206 void ipv6_mc_down(struct inet6_dev *idev); 207 void ipv6_mc_unmap(struct inet6_dev *idev); 208 void ipv6_mc_remap(struct inet6_dev *idev); 209 void ipv6_mc_init_dev(struct inet6_dev *idev); 210 void ipv6_mc_destroy_dev(struct inet6_dev *idev); 211 int ipv6_mc_check_mld(struct sk_buff *skb, struct sk_buff **skb_trimmed); 212 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp); 213 214 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, 215 const struct in6_addr *src_addr); 216 217 void ipv6_mc_dad_complete(struct inet6_dev *idev); 218 219 /* A stub used by vxlan module. This is ugly, ideally these 220 * symbols should be built into the core kernel. 221 */ 222 struct ipv6_stub { 223 int (*ipv6_sock_mc_join)(struct sock *sk, int ifindex, 224 const struct in6_addr *addr); 225 int (*ipv6_sock_mc_drop)(struct sock *sk, int ifindex, 226 const struct in6_addr *addr); 227 int (*ipv6_dst_lookup)(struct net *net, struct sock *sk, 228 struct dst_entry **dst, struct flowi6 *fl6); 229 void (*udpv6_encap_enable)(void); 230 void (*ndisc_send_na)(struct net_device *dev, const struct in6_addr *daddr, 231 const struct in6_addr *solicited_addr, 232 bool router, bool solicited, bool override, bool inc_opt); 233 struct neigh_table *nd_tbl; 234 }; 235 extern const struct ipv6_stub *ipv6_stub __read_mostly; 236 237 /* 238 * identify MLD packets for MLD filter exceptions 239 */ 240 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset) 241 { 242 struct icmp6hdr *hdr; 243 244 if (nexthdr != IPPROTO_ICMPV6 || 245 !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr))) 246 return false; 247 248 hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset); 249 250 switch (hdr->icmp6_type) { 251 case ICMPV6_MGM_QUERY: 252 case ICMPV6_MGM_REPORT: 253 case ICMPV6_MGM_REDUCTION: 254 case ICMPV6_MLD2_REPORT: 255 return true; 256 default: 257 break; 258 } 259 return false; 260 } 261 262 void addrconf_prefix_rcv(struct net_device *dev, 263 u8 *opt, int len, bool sllao); 264 265 /* 266 * anycast prototypes (anycast.c) 267 */ 268 int ipv6_sock_ac_join(struct sock *sk, int ifindex, 269 const struct in6_addr *addr); 270 int ipv6_sock_ac_drop(struct sock *sk, int ifindex, 271 const struct in6_addr *addr); 272 void ipv6_sock_ac_close(struct sock *sk); 273 274 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr); 275 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr); 276 void ipv6_ac_destroy_dev(struct inet6_dev *idev); 277 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev, 278 const struct in6_addr *addr); 279 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev, 280 const struct in6_addr *addr); 281 282 /* Device notifier */ 283 int register_inet6addr_notifier(struct notifier_block *nb); 284 int unregister_inet6addr_notifier(struct notifier_block *nb); 285 int inet6addr_notifier_call_chain(unsigned long val, void *v); 286 287 int register_inet6addr_validator_notifier(struct notifier_block *nb); 288 int unregister_inet6addr_validator_notifier(struct notifier_block *nb); 289 int inet6addr_validator_notifier_call_chain(unsigned long val, void *v); 290 291 void inet6_netconf_notify_devconf(struct net *net, int event, int type, 292 int ifindex, struct ipv6_devconf *devconf); 293 294 /** 295 * __in6_dev_get - get inet6_dev pointer from netdevice 296 * @dev: network device 297 * 298 * Caller must hold rcu_read_lock or RTNL, because this function 299 * does not take a reference on the inet6_dev. 300 */ 301 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev) 302 { 303 return rcu_dereference_rtnl(dev->ip6_ptr); 304 } 305 306 /** 307 * in6_dev_get - get inet6_dev pointer from netdevice 308 * @dev: network device 309 * 310 * This version can be used in any context, and takes a reference 311 * on the inet6_dev. Callers must use in6_dev_put() later to 312 * release this reference. 313 */ 314 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev) 315 { 316 struct inet6_dev *idev; 317 318 rcu_read_lock(); 319 idev = rcu_dereference(dev->ip6_ptr); 320 if (idev) 321 refcount_inc(&idev->refcnt); 322 rcu_read_unlock(); 323 return idev; 324 } 325 326 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev) 327 { 328 struct inet6_dev *idev = __in6_dev_get(dev); 329 330 return idev ? idev->nd_parms : NULL; 331 } 332 333 void in6_dev_finish_destroy(struct inet6_dev *idev); 334 335 static inline void in6_dev_put(struct inet6_dev *idev) 336 { 337 if (refcount_dec_and_test(&idev->refcnt)) 338 in6_dev_finish_destroy(idev); 339 } 340 341 static inline void in6_dev_put_clear(struct inet6_dev **pidev) 342 { 343 struct inet6_dev *idev = *pidev; 344 345 if (idev) { 346 in6_dev_put(idev); 347 *pidev = NULL; 348 } 349 } 350 351 static inline void __in6_dev_put(struct inet6_dev *idev) 352 { 353 refcount_dec(&idev->refcnt); 354 } 355 356 static inline void in6_dev_hold(struct inet6_dev *idev) 357 { 358 refcount_inc(&idev->refcnt); 359 } 360 361 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp); 362 363 static inline void in6_ifa_put(struct inet6_ifaddr *ifp) 364 { 365 if (refcount_dec_and_test(&ifp->refcnt)) 366 inet6_ifa_finish_destroy(ifp); 367 } 368 369 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp) 370 { 371 refcount_dec(&ifp->refcnt); 372 } 373 374 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp) 375 { 376 refcount_inc(&ifp->refcnt); 377 } 378 379 380 /* 381 * compute link-local solicited-node multicast address 382 */ 383 384 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr, 385 struct in6_addr *solicited) 386 { 387 ipv6_addr_set(solicited, 388 htonl(0xFF020000), 0, 389 htonl(0x1), 390 htonl(0xFF000000) | addr->s6_addr32[3]); 391 } 392 393 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr) 394 { 395 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 396 __be64 *p = (__be64 *)addr; 397 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL; 398 #else 399 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 400 addr->s6_addr32[1] | addr->s6_addr32[2] | 401 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0; 402 #endif 403 } 404 405 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr) 406 { 407 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 408 __be64 *p = (__be64 *)addr; 409 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL; 410 #else 411 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 412 addr->s6_addr32[1] | addr->s6_addr32[2] | 413 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0; 414 #endif 415 } 416 417 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr) 418 { 419 return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE); 420 } 421 422 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr) 423 { 424 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 425 __be64 *p = (__be64 *)addr; 426 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | 427 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) & 428 cpu_to_be64(0xffffffffff000000UL))) == 0UL; 429 #else 430 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 431 addr->s6_addr32[1] | 432 (addr->s6_addr32[2] ^ htonl(0x00000001)) | 433 (addr->s6_addr[12] ^ 0xff)) == 0; 434 #endif 435 } 436 437 #ifdef CONFIG_PROC_FS 438 int if6_proc_init(void); 439 void if6_proc_exit(void); 440 #endif 441 442 #endif 443