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