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