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