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