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 ipv4_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2, 92 bool match_wildcard); 93 int ipv6_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 int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 109 { 110 if (dev->addr_len != ETH_ALEN) 111 return -1; 112 memcpy(eui, dev->dev_addr, 3); 113 memcpy(eui + 5, dev->dev_addr + 3, 3); 114 115 /* 116 * The zSeries OSA network cards can be shared among various 117 * OS instances, but the OSA cards have only one MAC address. 118 * This leads to duplicate address conflicts in conjunction 119 * with IPv6 if more than one instance uses the same card. 120 * 121 * The driver for these cards can deliver a unique 16-bit 122 * identifier for each instance sharing the same card. It is 123 * placed instead of 0xFFFE in the interface identifier. The 124 * "u" bit of the interface identifier is not inverted in this 125 * case. Hence the resulting interface identifier has local 126 * scope according to RFC2373. 127 */ 128 if (dev->dev_id) { 129 eui[3] = (dev->dev_id >> 8) & 0xFF; 130 eui[4] = dev->dev_id & 0xFF; 131 } else { 132 eui[3] = 0xFF; 133 eui[4] = 0xFE; 134 eui[0] ^= 2; 135 } 136 return 0; 137 } 138 139 static inline unsigned long addrconf_timeout_fixup(u32 timeout, 140 unsigned int unit) 141 { 142 if (timeout == 0xffffffff) 143 return ~0UL; 144 145 /* 146 * Avoid arithmetic overflow. 147 * Assuming unit is constant and non-zero, this "if" statement 148 * will go away on 64bit archs. 149 */ 150 if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit) 151 return LONG_MAX / unit; 152 153 return timeout; 154 } 155 156 static inline int addrconf_finite_timeout(unsigned long timeout) 157 { 158 return ~timeout; 159 } 160 161 /* 162 * IPv6 Address Label subsystem (addrlabel.c) 163 */ 164 int ipv6_addr_label_init(void); 165 void ipv6_addr_label_cleanup(void); 166 void ipv6_addr_label_rtnl_register(void); 167 u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr, 168 int type, int ifindex); 169 170 /* 171 * multicast prototypes (mcast.c) 172 */ 173 int ipv6_sock_mc_join(struct sock *sk, int ifindex, 174 const struct in6_addr *addr); 175 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, 176 const struct in6_addr *addr); 177 void __ipv6_sock_mc_close(struct sock *sk); 178 void ipv6_sock_mc_close(struct sock *sk); 179 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr, 180 const struct in6_addr *src_addr); 181 182 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr); 183 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr); 184 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr); 185 void ipv6_mc_up(struct inet6_dev *idev); 186 void ipv6_mc_down(struct inet6_dev *idev); 187 void ipv6_mc_unmap(struct inet6_dev *idev); 188 void ipv6_mc_remap(struct inet6_dev *idev); 189 void ipv6_mc_init_dev(struct inet6_dev *idev); 190 void ipv6_mc_destroy_dev(struct inet6_dev *idev); 191 int ipv6_mc_check_mld(struct sk_buff *skb, struct sk_buff **skb_trimmed); 192 void addrconf_dad_failure(struct inet6_ifaddr *ifp); 193 194 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, 195 const struct in6_addr *src_addr); 196 197 void ipv6_mc_dad_complete(struct inet6_dev *idev); 198 199 /* A stub used by vxlan module. This is ugly, ideally these 200 * symbols should be built into the core kernel. 201 */ 202 struct ipv6_stub { 203 int (*ipv6_sock_mc_join)(struct sock *sk, int ifindex, 204 const struct in6_addr *addr); 205 int (*ipv6_sock_mc_drop)(struct sock *sk, int ifindex, 206 const struct in6_addr *addr); 207 int (*ipv6_dst_lookup)(struct net *net, struct sock *sk, 208 struct dst_entry **dst, struct flowi6 *fl6); 209 void (*udpv6_encap_enable)(void); 210 void (*ndisc_send_na)(struct net_device *dev, const struct in6_addr *daddr, 211 const struct in6_addr *solicited_addr, 212 bool router, bool solicited, bool override, bool inc_opt); 213 struct neigh_table *nd_tbl; 214 }; 215 extern const struct ipv6_stub *ipv6_stub __read_mostly; 216 217 /* 218 * identify MLD packets for MLD filter exceptions 219 */ 220 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset) 221 { 222 struct icmp6hdr *hdr; 223 224 if (nexthdr != IPPROTO_ICMPV6 || 225 !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr))) 226 return false; 227 228 hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset); 229 230 switch (hdr->icmp6_type) { 231 case ICMPV6_MGM_QUERY: 232 case ICMPV6_MGM_REPORT: 233 case ICMPV6_MGM_REDUCTION: 234 case ICMPV6_MLD2_REPORT: 235 return true; 236 default: 237 break; 238 } 239 return false; 240 } 241 242 void addrconf_prefix_rcv(struct net_device *dev, 243 u8 *opt, int len, bool sllao); 244 245 /* 246 * anycast prototypes (anycast.c) 247 */ 248 int ipv6_sock_ac_join(struct sock *sk, int ifindex, 249 const struct in6_addr *addr); 250 int ipv6_sock_ac_drop(struct sock *sk, int ifindex, 251 const struct in6_addr *addr); 252 void ipv6_sock_ac_close(struct sock *sk); 253 254 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr); 255 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr); 256 void ipv6_ac_destroy_dev(struct inet6_dev *idev); 257 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev, 258 const struct in6_addr *addr); 259 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev, 260 const struct in6_addr *addr); 261 262 /* Device notifier */ 263 int register_inet6addr_notifier(struct notifier_block *nb); 264 int unregister_inet6addr_notifier(struct notifier_block *nb); 265 int inet6addr_notifier_call_chain(unsigned long val, void *v); 266 267 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex, 268 struct ipv6_devconf *devconf); 269 270 /** 271 * __in6_dev_get - get inet6_dev pointer from netdevice 272 * @dev: network device 273 * 274 * Caller must hold rcu_read_lock or RTNL, because this function 275 * does not take a reference on the inet6_dev. 276 */ 277 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev) 278 { 279 return rcu_dereference_rtnl(dev->ip6_ptr); 280 } 281 282 /** 283 * in6_dev_get - get inet6_dev pointer from netdevice 284 * @dev: network device 285 * 286 * This version can be used in any context, and takes a reference 287 * on the inet6_dev. Callers must use in6_dev_put() later to 288 * release this reference. 289 */ 290 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev) 291 { 292 struct inet6_dev *idev; 293 294 rcu_read_lock(); 295 idev = rcu_dereference(dev->ip6_ptr); 296 if (idev) 297 atomic_inc(&idev->refcnt); 298 rcu_read_unlock(); 299 return idev; 300 } 301 302 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev) 303 { 304 struct inet6_dev *idev = __in6_dev_get(dev); 305 306 return idev ? idev->nd_parms : NULL; 307 } 308 309 void in6_dev_finish_destroy(struct inet6_dev *idev); 310 311 static inline void in6_dev_put(struct inet6_dev *idev) 312 { 313 if (atomic_dec_and_test(&idev->refcnt)) 314 in6_dev_finish_destroy(idev); 315 } 316 317 static inline void __in6_dev_put(struct inet6_dev *idev) 318 { 319 atomic_dec(&idev->refcnt); 320 } 321 322 static inline void in6_dev_hold(struct inet6_dev *idev) 323 { 324 atomic_inc(&idev->refcnt); 325 } 326 327 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp); 328 329 static inline void in6_ifa_put(struct inet6_ifaddr *ifp) 330 { 331 if (atomic_dec_and_test(&ifp->refcnt)) 332 inet6_ifa_finish_destroy(ifp); 333 } 334 335 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp) 336 { 337 atomic_dec(&ifp->refcnt); 338 } 339 340 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp) 341 { 342 atomic_inc(&ifp->refcnt); 343 } 344 345 346 /* 347 * compute link-local solicited-node multicast address 348 */ 349 350 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr, 351 struct in6_addr *solicited) 352 { 353 ipv6_addr_set(solicited, 354 htonl(0xFF020000), 0, 355 htonl(0x1), 356 htonl(0xFF000000) | addr->s6_addr32[3]); 357 } 358 359 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr) 360 { 361 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 362 __be64 *p = (__be64 *)addr; 363 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL; 364 #else 365 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 366 addr->s6_addr32[1] | addr->s6_addr32[2] | 367 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0; 368 #endif 369 } 370 371 static inline bool ipv6_addr_is_ll_all_routers(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(2))) == 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(0x00000002))) == 0; 380 #endif 381 } 382 383 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr) 384 { 385 return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE); 386 } 387 388 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr) 389 { 390 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 391 __be64 *p = (__be64 *)addr; 392 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | 393 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) & 394 cpu_to_be64(0xffffffffff000000UL))) == 0UL; 395 #else 396 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 397 addr->s6_addr32[1] | 398 (addr->s6_addr32[2] ^ htonl(0x00000001)) | 399 (addr->s6_addr[12] ^ 0xff)) == 0; 400 #endif 401 } 402 403 #ifdef CONFIG_PROC_FS 404 int if6_proc_init(void); 405 void if6_proc_exit(void); 406 #endif 407 408 #endif 409