1 #ifndef _ADDRCONF_H 2 #define _ADDRCONF_H 3 4 #define MAX_RTR_SOLICITATIONS -1 /* unlimited */ 5 #define RTR_SOLICITATION_INTERVAL (4*HZ) 6 #define RTR_SOLICITATION_MAX_INTERVAL (3600*HZ) /* 1 hour */ 7 8 #define MIN_VALID_LIFETIME (2*3600) /* 2 hours */ 9 10 #define TEMP_VALID_LIFETIME (7*86400) 11 #define TEMP_PREFERRED_LIFETIME (86400) 12 #define REGEN_MAX_RETRY (3) 13 #define MAX_DESYNC_FACTOR (600) 14 15 #define ADDR_CHECK_FREQUENCY (120*HZ) 16 17 #define IPV6_MAX_ADDRESSES 16 18 19 #define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ / 50 : 1) 20 #define ADDRCONF_TIMER_FUZZ (HZ / 4) 21 #define ADDRCONF_TIMER_FUZZ_MAX (HZ) 22 23 #define ADDRCONF_NOTIFY_PRIORITY 0 24 25 #include <linux/in.h> 26 #include <linux/in6.h> 27 28 struct prefix_info { 29 __u8 type; 30 __u8 length; 31 __u8 prefix_len; 32 33 #if defined(__BIG_ENDIAN_BITFIELD) 34 __u8 onlink : 1, 35 autoconf : 1, 36 reserved : 6; 37 #elif defined(__LITTLE_ENDIAN_BITFIELD) 38 __u8 reserved : 6, 39 autoconf : 1, 40 onlink : 1; 41 #else 42 #error "Please fix <asm/byteorder.h>" 43 #endif 44 __be32 valid; 45 __be32 prefered; 46 __be32 reserved2; 47 48 struct in6_addr prefix; 49 }; 50 51 #include <linux/netdevice.h> 52 #include <net/if_inet6.h> 53 #include <net/ipv6.h> 54 55 struct in6_validator_info { 56 struct in6_addr i6vi_addr; 57 struct inet6_dev *i6vi_dev; 58 struct netlink_ext_ack *extack; 59 }; 60 61 #define IN6_ADDR_HSIZE_SHIFT 8 62 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT) 63 64 int addrconf_init(void); 65 void addrconf_cleanup(void); 66 67 int addrconf_add_ifaddr(struct net *net, void __user *arg); 68 int addrconf_del_ifaddr(struct net *net, void __user *arg); 69 int addrconf_set_dstaddr(struct net *net, void __user *arg); 70 71 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 72 const struct net_device *dev, int strict); 73 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 74 const struct net_device *dev, int strict, 75 u32 banned_flags); 76 77 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 78 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr); 79 #endif 80 81 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 82 const unsigned int prefix_len, 83 struct net_device *dev); 84 85 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev); 86 87 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, 88 const struct in6_addr *addr, 89 struct net_device *dev, int strict); 90 91 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev, 92 const struct in6_addr *daddr, unsigned int srcprefs, 93 struct in6_addr *saddr); 94 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 95 u32 banned_flags); 96 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 97 u32 banned_flags); 98 bool inet_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2, 99 bool match_wildcard); 100 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr); 101 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr); 102 103 void addrconf_add_linklocal(struct inet6_dev *idev, 104 const struct in6_addr *addr, u32 flags); 105 106 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 107 const struct prefix_info *pinfo, 108 struct inet6_dev *in6_dev, 109 const struct in6_addr *addr, int addr_type, 110 u32 addr_flags, bool sllao, bool tokenized, 111 __u32 valid_lft, u32 prefered_lft); 112 113 static inline void addrconf_addr_eui48_base(u8 *eui, const char *const addr) 114 { 115 memcpy(eui, addr, 3); 116 eui[3] = 0xFF; 117 eui[4] = 0xFE; 118 memcpy(eui + 5, addr + 3, 3); 119 } 120 121 static inline void addrconf_addr_eui48(u8 *eui, const char *const addr) 122 { 123 addrconf_addr_eui48_base(eui, addr); 124 eui[0] ^= 2; 125 } 126 127 static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 128 { 129 if (dev->addr_len != ETH_ALEN) 130 return -1; 131 132 /* 133 * The zSeries OSA network cards can be shared among various 134 * OS instances, but the OSA cards have only one MAC address. 135 * This leads to duplicate address conflicts in conjunction 136 * with IPv6 if more than one instance uses the same card. 137 * 138 * The driver for these cards can deliver a unique 16-bit 139 * identifier for each instance sharing the same card. It is 140 * placed instead of 0xFFFE in the interface identifier. The 141 * "u" bit of the interface identifier is not inverted in this 142 * case. Hence the resulting interface identifier has local 143 * scope according to RFC2373. 144 */ 145 146 addrconf_addr_eui48_base(eui, dev->dev_addr); 147 148 if (dev->dev_id) { 149 eui[3] = (dev->dev_id >> 8) & 0xFF; 150 eui[4] = dev->dev_id & 0xFF; 151 } else { 152 eui[0] ^= 2; 153 } 154 155 return 0; 156 } 157 158 static inline unsigned long addrconf_timeout_fixup(u32 timeout, 159 unsigned int unit) 160 { 161 if (timeout == 0xffffffff) 162 return ~0UL; 163 164 /* 165 * Avoid arithmetic overflow. 166 * Assuming unit is constant and non-zero, this "if" statement 167 * will go away on 64bit archs. 168 */ 169 if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit) 170 return LONG_MAX / unit; 171 172 return timeout; 173 } 174 175 static inline int addrconf_finite_timeout(unsigned long timeout) 176 { 177 return ~timeout; 178 } 179 180 /* 181 * IPv6 Address Label subsystem (addrlabel.c) 182 */ 183 int ipv6_addr_label_init(void); 184 void ipv6_addr_label_cleanup(void); 185 void ipv6_addr_label_rtnl_register(void); 186 u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr, 187 int type, int ifindex); 188 189 /* 190 * multicast prototypes (mcast.c) 191 */ 192 int ipv6_sock_mc_join(struct sock *sk, int ifindex, 193 const struct in6_addr *addr); 194 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, 195 const struct in6_addr *addr); 196 void __ipv6_sock_mc_close(struct sock *sk); 197 void ipv6_sock_mc_close(struct sock *sk); 198 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr, 199 const struct in6_addr *src_addr); 200 201 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr); 202 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr); 203 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr); 204 void ipv6_mc_up(struct inet6_dev *idev); 205 void ipv6_mc_down(struct inet6_dev *idev); 206 void ipv6_mc_unmap(struct inet6_dev *idev); 207 void ipv6_mc_remap(struct inet6_dev *idev); 208 void ipv6_mc_init_dev(struct inet6_dev *idev); 209 void ipv6_mc_destroy_dev(struct inet6_dev *idev); 210 int ipv6_mc_check_mld(struct sk_buff *skb, struct sk_buff **skb_trimmed); 211 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp); 212 213 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, 214 const struct in6_addr *src_addr); 215 216 void ipv6_mc_dad_complete(struct inet6_dev *idev); 217 218 /* A stub used by vxlan module. This is ugly, ideally these 219 * symbols should be built into the core kernel. 220 */ 221 struct ipv6_stub { 222 int (*ipv6_sock_mc_join)(struct sock *sk, int ifindex, 223 const struct in6_addr *addr); 224 int (*ipv6_sock_mc_drop)(struct sock *sk, int ifindex, 225 const struct in6_addr *addr); 226 int (*ipv6_dst_lookup)(struct net *net, struct sock *sk, 227 struct dst_entry **dst, struct flowi6 *fl6); 228 void (*udpv6_encap_enable)(void); 229 void (*ndisc_send_na)(struct net_device *dev, const struct in6_addr *daddr, 230 const struct in6_addr *solicited_addr, 231 bool router, bool solicited, bool override, bool inc_opt); 232 struct neigh_table *nd_tbl; 233 }; 234 extern const struct ipv6_stub *ipv6_stub __read_mostly; 235 236 /* 237 * identify MLD packets for MLD filter exceptions 238 */ 239 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset) 240 { 241 struct icmp6hdr *hdr; 242 243 if (nexthdr != IPPROTO_ICMPV6 || 244 !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr))) 245 return false; 246 247 hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset); 248 249 switch (hdr->icmp6_type) { 250 case ICMPV6_MGM_QUERY: 251 case ICMPV6_MGM_REPORT: 252 case ICMPV6_MGM_REDUCTION: 253 case ICMPV6_MLD2_REPORT: 254 return true; 255 default: 256 break; 257 } 258 return false; 259 } 260 261 void addrconf_prefix_rcv(struct net_device *dev, 262 u8 *opt, int len, bool sllao); 263 264 /* 265 * anycast prototypes (anycast.c) 266 */ 267 int ipv6_sock_ac_join(struct sock *sk, int ifindex, 268 const struct in6_addr *addr); 269 int ipv6_sock_ac_drop(struct sock *sk, int ifindex, 270 const struct in6_addr *addr); 271 void ipv6_sock_ac_close(struct sock *sk); 272 273 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr); 274 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr); 275 void ipv6_ac_destroy_dev(struct inet6_dev *idev); 276 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev, 277 const struct in6_addr *addr); 278 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev, 279 const struct in6_addr *addr); 280 281 /* Device notifier */ 282 int register_inet6addr_notifier(struct notifier_block *nb); 283 int unregister_inet6addr_notifier(struct notifier_block *nb); 284 int inet6addr_notifier_call_chain(unsigned long val, void *v); 285 286 int register_inet6addr_validator_notifier(struct notifier_block *nb); 287 int unregister_inet6addr_validator_notifier(struct notifier_block *nb); 288 int inet6addr_validator_notifier_call_chain(unsigned long val, void *v); 289 290 void inet6_netconf_notify_devconf(struct net *net, int event, int type, 291 int ifindex, struct ipv6_devconf *devconf); 292 293 /** 294 * __in6_dev_get - get inet6_dev pointer from netdevice 295 * @dev: network device 296 * 297 * Caller must hold rcu_read_lock or RTNL, because this function 298 * does not take a reference on the inet6_dev. 299 */ 300 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev) 301 { 302 return rcu_dereference_rtnl(dev->ip6_ptr); 303 } 304 305 /** 306 * in6_dev_get - get inet6_dev pointer from netdevice 307 * @dev: network device 308 * 309 * This version can be used in any context, and takes a reference 310 * on the inet6_dev. Callers must use in6_dev_put() later to 311 * release this reference. 312 */ 313 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev) 314 { 315 struct inet6_dev *idev; 316 317 rcu_read_lock(); 318 idev = rcu_dereference(dev->ip6_ptr); 319 if (idev) 320 refcount_inc(&idev->refcnt); 321 rcu_read_unlock(); 322 return idev; 323 } 324 325 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev) 326 { 327 struct inet6_dev *idev = __in6_dev_get(dev); 328 329 return idev ? idev->nd_parms : NULL; 330 } 331 332 void in6_dev_finish_destroy(struct inet6_dev *idev); 333 334 static inline void in6_dev_put(struct inet6_dev *idev) 335 { 336 if (refcount_dec_and_test(&idev->refcnt)) 337 in6_dev_finish_destroy(idev); 338 } 339 340 static inline void in6_dev_put_clear(struct inet6_dev **pidev) 341 { 342 struct inet6_dev *idev = *pidev; 343 344 if (idev) { 345 in6_dev_put(idev); 346 *pidev = NULL; 347 } 348 } 349 350 static inline void __in6_dev_put(struct inet6_dev *idev) 351 { 352 refcount_dec(&idev->refcnt); 353 } 354 355 static inline void in6_dev_hold(struct inet6_dev *idev) 356 { 357 refcount_inc(&idev->refcnt); 358 } 359 360 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp); 361 362 static inline void in6_ifa_put(struct inet6_ifaddr *ifp) 363 { 364 if (refcount_dec_and_test(&ifp->refcnt)) 365 inet6_ifa_finish_destroy(ifp); 366 } 367 368 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp) 369 { 370 refcount_dec(&ifp->refcnt); 371 } 372 373 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp) 374 { 375 refcount_inc(&ifp->refcnt); 376 } 377 378 379 /* 380 * compute link-local solicited-node multicast address 381 */ 382 383 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr, 384 struct in6_addr *solicited) 385 { 386 ipv6_addr_set(solicited, 387 htonl(0xFF020000), 0, 388 htonl(0x1), 389 htonl(0xFF000000) | addr->s6_addr32[3]); 390 } 391 392 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr) 393 { 394 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 395 __be64 *p = (__be64 *)addr; 396 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL; 397 #else 398 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 399 addr->s6_addr32[1] | addr->s6_addr32[2] | 400 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0; 401 #endif 402 } 403 404 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr) 405 { 406 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 407 __be64 *p = (__be64 *)addr; 408 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL; 409 #else 410 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 411 addr->s6_addr32[1] | addr->s6_addr32[2] | 412 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0; 413 #endif 414 } 415 416 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr) 417 { 418 return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE); 419 } 420 421 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr) 422 { 423 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 424 __be64 *p = (__be64 *)addr; 425 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | 426 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) & 427 cpu_to_be64(0xffffffffff000000UL))) == 0UL; 428 #else 429 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 430 addr->s6_addr32[1] | 431 (addr->s6_addr32[2] ^ htonl(0x00000001)) | 432 (addr->s6_addr[12] ^ 0xff)) == 0; 433 #endif 434 } 435 436 #ifdef CONFIG_PROC_FS 437 int if6_proc_init(void); 438 void if6_proc_exit(void); 439 #endif 440 441 #endif 442