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 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr, 179 const struct in6_addr *src_addr); 180 181 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr); 182 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr); 183 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr); 184 void ipv6_mc_up(struct inet6_dev *idev); 185 void ipv6_mc_down(struct inet6_dev *idev); 186 void ipv6_mc_unmap(struct inet6_dev *idev); 187 void ipv6_mc_remap(struct inet6_dev *idev); 188 void ipv6_mc_init_dev(struct inet6_dev *idev); 189 void ipv6_mc_destroy_dev(struct inet6_dev *idev); 190 int ipv6_mc_check_mld(struct sk_buff *skb, struct sk_buff **skb_trimmed); 191 void addrconf_dad_failure(struct inet6_ifaddr *ifp); 192 193 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, 194 const struct in6_addr *src_addr); 195 196 void ipv6_mc_dad_complete(struct inet6_dev *idev); 197 198 /* A stub used by vxlan module. This is ugly, ideally these 199 * symbols should be built into the core kernel. 200 */ 201 struct ipv6_stub { 202 int (*ipv6_sock_mc_join)(struct sock *sk, int ifindex, 203 const struct in6_addr *addr); 204 int (*ipv6_sock_mc_drop)(struct sock *sk, int ifindex, 205 const struct in6_addr *addr); 206 int (*ipv6_dst_lookup)(struct net *net, struct sock *sk, 207 struct dst_entry **dst, struct flowi6 *fl6); 208 void (*udpv6_encap_enable)(void); 209 void (*ndisc_send_na)(struct net_device *dev, const struct in6_addr *daddr, 210 const struct in6_addr *solicited_addr, 211 bool router, bool solicited, bool override, bool inc_opt); 212 struct neigh_table *nd_tbl; 213 }; 214 extern const struct ipv6_stub *ipv6_stub __read_mostly; 215 216 /* 217 * identify MLD packets for MLD filter exceptions 218 */ 219 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset) 220 { 221 struct icmp6hdr *hdr; 222 223 if (nexthdr != IPPROTO_ICMPV6 || 224 !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr))) 225 return false; 226 227 hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset); 228 229 switch (hdr->icmp6_type) { 230 case ICMPV6_MGM_QUERY: 231 case ICMPV6_MGM_REPORT: 232 case ICMPV6_MGM_REDUCTION: 233 case ICMPV6_MLD2_REPORT: 234 return true; 235 default: 236 break; 237 } 238 return false; 239 } 240 241 void addrconf_prefix_rcv(struct net_device *dev, 242 u8 *opt, int len, bool sllao); 243 244 /* 245 * anycast prototypes (anycast.c) 246 */ 247 int ipv6_sock_ac_join(struct sock *sk, int ifindex, 248 const struct in6_addr *addr); 249 int ipv6_sock_ac_drop(struct sock *sk, int ifindex, 250 const struct in6_addr *addr); 251 void ipv6_sock_ac_close(struct sock *sk); 252 253 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr); 254 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr); 255 void ipv6_ac_destroy_dev(struct inet6_dev *idev); 256 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev, 257 const struct in6_addr *addr); 258 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev, 259 const struct in6_addr *addr); 260 261 /* Device notifier */ 262 int register_inet6addr_notifier(struct notifier_block *nb); 263 int unregister_inet6addr_notifier(struct notifier_block *nb); 264 int inet6addr_notifier_call_chain(unsigned long val, void *v); 265 266 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex, 267 struct ipv6_devconf *devconf); 268 269 /** 270 * __in6_dev_get - get inet6_dev pointer from netdevice 271 * @dev: network device 272 * 273 * Caller must hold rcu_read_lock or RTNL, because this function 274 * does not take a reference on the inet6_dev. 275 */ 276 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev) 277 { 278 return rcu_dereference_rtnl(dev->ip6_ptr); 279 } 280 281 /** 282 * in6_dev_get - get inet6_dev pointer from netdevice 283 * @dev: network device 284 * 285 * This version can be used in any context, and takes a reference 286 * on the inet6_dev. Callers must use in6_dev_put() later to 287 * release this reference. 288 */ 289 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev) 290 { 291 struct inet6_dev *idev; 292 293 rcu_read_lock(); 294 idev = rcu_dereference(dev->ip6_ptr); 295 if (idev) 296 atomic_inc(&idev->refcnt); 297 rcu_read_unlock(); 298 return idev; 299 } 300 301 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev) 302 { 303 struct inet6_dev *idev = __in6_dev_get(dev); 304 305 return idev ? idev->nd_parms : NULL; 306 } 307 308 void in6_dev_finish_destroy(struct inet6_dev *idev); 309 310 static inline void in6_dev_put(struct inet6_dev *idev) 311 { 312 if (atomic_dec_and_test(&idev->refcnt)) 313 in6_dev_finish_destroy(idev); 314 } 315 316 static inline void __in6_dev_put(struct inet6_dev *idev) 317 { 318 atomic_dec(&idev->refcnt); 319 } 320 321 static inline void in6_dev_hold(struct inet6_dev *idev) 322 { 323 atomic_inc(&idev->refcnt); 324 } 325 326 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp); 327 328 static inline void in6_ifa_put(struct inet6_ifaddr *ifp) 329 { 330 if (atomic_dec_and_test(&ifp->refcnt)) 331 inet6_ifa_finish_destroy(ifp); 332 } 333 334 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp) 335 { 336 atomic_dec(&ifp->refcnt); 337 } 338 339 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp) 340 { 341 atomic_inc(&ifp->refcnt); 342 } 343 344 345 /* 346 * compute link-local solicited-node multicast address 347 */ 348 349 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr, 350 struct in6_addr *solicited) 351 { 352 ipv6_addr_set(solicited, 353 htonl(0xFF020000), 0, 354 htonl(0x1), 355 htonl(0xFF000000) | addr->s6_addr32[3]); 356 } 357 358 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr) 359 { 360 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 361 __be64 *p = (__be64 *)addr; 362 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL; 363 #else 364 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 365 addr->s6_addr32[1] | addr->s6_addr32[2] | 366 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0; 367 #endif 368 } 369 370 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr) 371 { 372 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 373 __be64 *p = (__be64 *)addr; 374 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL; 375 #else 376 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 377 addr->s6_addr32[1] | addr->s6_addr32[2] | 378 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0; 379 #endif 380 } 381 382 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr) 383 { 384 return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE); 385 } 386 387 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr) 388 { 389 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 390 __be64 *p = (__be64 *)addr; 391 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | 392 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) & 393 cpu_to_be64(0xffffffffff000000UL))) == 0UL; 394 #else 395 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 396 addr->s6_addr32[1] | 397 (addr->s6_addr32[2] ^ htonl(0x00000001)) | 398 (addr->s6_addr[12] ^ 0xff)) == 0; 399 #endif 400 } 401 402 #ifdef CONFIG_PROC_FS 403 int if6_proc_init(void); 404 void if6_proc_exit(void); 405 #endif 406 407 #endif 408