1 #ifndef _ADDRCONF_H 2 #define _ADDRCONF_H 3 4 #define MAX_RTR_SOLICITATIONS 3 5 #define RTR_SOLICITATION_INTERVAL (4*HZ) 6 7 #define MIN_VALID_LIFETIME (2*3600) /* 2 hours */ 8 9 #define TEMP_VALID_LIFETIME (7*86400) 10 #define TEMP_PREFERRED_LIFETIME (86400) 11 #define REGEN_MAX_RETRY (3) 12 #define MAX_DESYNC_FACTOR (600) 13 14 #define ADDR_CHECK_FREQUENCY (120*HZ) 15 16 #define IPV6_MAX_ADDRESSES 16 17 18 #define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ / 50 : 1) 19 #define ADDRCONF_TIMER_FUZZ (HZ / 4) 20 #define ADDRCONF_TIMER_FUZZ_MAX (HZ) 21 22 #include <linux/in.h> 23 #include <linux/in6.h> 24 25 struct prefix_info { 26 __u8 type; 27 __u8 length; 28 __u8 prefix_len; 29 30 #if defined(__BIG_ENDIAN_BITFIELD) 31 __u8 onlink : 1, 32 autoconf : 1, 33 reserved : 6; 34 #elif defined(__LITTLE_ENDIAN_BITFIELD) 35 __u8 reserved : 6, 36 autoconf : 1, 37 onlink : 1; 38 #else 39 #error "Please fix <asm/byteorder.h>" 40 #endif 41 __be32 valid; 42 __be32 prefered; 43 __be32 reserved2; 44 45 struct in6_addr prefix; 46 }; 47 48 49 #include <linux/netdevice.h> 50 #include <net/if_inet6.h> 51 #include <net/ipv6.h> 52 53 #define IN6_ADDR_HSIZE_SHIFT 4 54 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT) 55 56 int addrconf_init(void); 57 void addrconf_cleanup(void); 58 59 int addrconf_add_ifaddr(struct net *net, void __user *arg); 60 int addrconf_del_ifaddr(struct net *net, void __user *arg); 61 int addrconf_set_dstaddr(struct net *net, void __user *arg); 62 63 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 64 const struct net_device *dev, int strict); 65 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 66 const struct net_device *dev, int strict, 67 u32 banned_flags); 68 69 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 70 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr); 71 #endif 72 73 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 74 const unsigned int prefix_len, 75 struct net_device *dev); 76 77 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev); 78 79 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, 80 const struct in6_addr *addr, 81 struct net_device *dev, int strict); 82 83 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev, 84 const struct in6_addr *daddr, unsigned int srcprefs, 85 struct in6_addr *saddr); 86 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 87 u32 banned_flags); 88 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 89 u32 banned_flags); 90 int ipv4_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2, 91 bool match_wildcard); 92 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2, 93 bool match_wildcard); 94 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr); 95 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr); 96 97 void addrconf_add_linklocal(struct inet6_dev *idev, 98 const struct in6_addr *addr, u32 flags); 99 100 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 101 const struct prefix_info *pinfo, 102 struct inet6_dev *in6_dev, 103 const struct in6_addr *addr, int addr_type, 104 u32 addr_flags, bool sllao, bool tokenized, 105 __u32 valid_lft, u32 prefered_lft); 106 107 static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 108 { 109 if (dev->addr_len != ETH_ALEN) 110 return -1; 111 memcpy(eui, dev->dev_addr, 3); 112 memcpy(eui + 5, dev->dev_addr + 3, 3); 113 114 /* 115 * The zSeries OSA network cards can be shared among various 116 * OS instances, but the OSA cards have only one MAC address. 117 * This leads to duplicate address conflicts in conjunction 118 * with IPv6 if more than one instance uses the same card. 119 * 120 * The driver for these cards can deliver a unique 16-bit 121 * identifier for each instance sharing the same card. It is 122 * placed instead of 0xFFFE in the interface identifier. The 123 * "u" bit of the interface identifier is not inverted in this 124 * case. Hence the resulting interface identifier has local 125 * scope according to RFC2373. 126 */ 127 if (dev->dev_id) { 128 eui[3] = (dev->dev_id >> 8) & 0xFF; 129 eui[4] = dev->dev_id & 0xFF; 130 } else { 131 eui[3] = 0xFF; 132 eui[4] = 0xFE; 133 eui[0] ^= 2; 134 } 135 return 0; 136 } 137 138 static inline unsigned long addrconf_timeout_fixup(u32 timeout, 139 unsigned int unit) 140 { 141 if (timeout == 0xffffffff) 142 return ~0UL; 143 144 /* 145 * Avoid arithmetic overflow. 146 * Assuming unit is constant and non-zero, this "if" statement 147 * will go away on 64bit archs. 148 */ 149 if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit) 150 return LONG_MAX / unit; 151 152 return timeout; 153 } 154 155 static inline int addrconf_finite_timeout(unsigned long timeout) 156 { 157 return ~timeout; 158 } 159 160 /* 161 * IPv6 Address Label subsystem (addrlabel.c) 162 */ 163 int ipv6_addr_label_init(void); 164 void ipv6_addr_label_cleanup(void); 165 void ipv6_addr_label_rtnl_register(void); 166 u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr, 167 int type, int ifindex); 168 169 /* 170 * multicast prototypes (mcast.c) 171 */ 172 int ipv6_sock_mc_join(struct sock *sk, int ifindex, 173 const struct in6_addr *addr); 174 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, 175 const struct in6_addr *addr); 176 void ipv6_sock_mc_close(struct sock *sk); 177 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr, 178 const struct in6_addr *src_addr); 179 180 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr); 181 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr); 182 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr); 183 void ipv6_mc_up(struct inet6_dev *idev); 184 void ipv6_mc_down(struct inet6_dev *idev); 185 void ipv6_mc_unmap(struct inet6_dev *idev); 186 void ipv6_mc_remap(struct inet6_dev *idev); 187 void ipv6_mc_init_dev(struct inet6_dev *idev); 188 void ipv6_mc_destroy_dev(struct inet6_dev *idev); 189 int ipv6_mc_check_mld(struct sk_buff *skb, struct sk_buff **skb_trimmed); 190 void addrconf_dad_failure(struct inet6_ifaddr *ifp); 191 192 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, 193 const struct in6_addr *src_addr); 194 195 void ipv6_mc_dad_complete(struct inet6_dev *idev); 196 197 /* A stub used by vxlan module. This is ugly, ideally these 198 * symbols should be built into the core kernel. 199 */ 200 struct ipv6_stub { 201 int (*ipv6_sock_mc_join)(struct sock *sk, int ifindex, 202 const struct in6_addr *addr); 203 int (*ipv6_sock_mc_drop)(struct sock *sk, int ifindex, 204 const struct in6_addr *addr); 205 int (*ipv6_dst_lookup)(struct net *net, struct sock *sk, 206 struct dst_entry **dst, struct flowi6 *fl6); 207 void (*udpv6_encap_enable)(void); 208 void (*ndisc_send_na)(struct net_device *dev, const struct in6_addr *daddr, 209 const struct in6_addr *solicited_addr, 210 bool router, bool solicited, bool override, bool inc_opt); 211 struct neigh_table *nd_tbl; 212 }; 213 extern const struct ipv6_stub *ipv6_stub __read_mostly; 214 215 /* 216 * identify MLD packets for MLD filter exceptions 217 */ 218 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset) 219 { 220 struct icmp6hdr *hdr; 221 222 if (nexthdr != IPPROTO_ICMPV6 || 223 !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr))) 224 return false; 225 226 hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset); 227 228 switch (hdr->icmp6_type) { 229 case ICMPV6_MGM_QUERY: 230 case ICMPV6_MGM_REPORT: 231 case ICMPV6_MGM_REDUCTION: 232 case ICMPV6_MLD2_REPORT: 233 return true; 234 default: 235 break; 236 } 237 return false; 238 } 239 240 void addrconf_prefix_rcv(struct net_device *dev, 241 u8 *opt, int len, bool sllao); 242 243 /* 244 * anycast prototypes (anycast.c) 245 */ 246 int ipv6_sock_ac_join(struct sock *sk, int ifindex, 247 const struct in6_addr *addr); 248 int ipv6_sock_ac_drop(struct sock *sk, int ifindex, 249 const struct in6_addr *addr); 250 void ipv6_sock_ac_close(struct sock *sk); 251 252 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr); 253 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr); 254 void ipv6_ac_destroy_dev(struct inet6_dev *idev); 255 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev, 256 const struct in6_addr *addr); 257 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev, 258 const struct in6_addr *addr); 259 260 /* Device notifier */ 261 int register_inet6addr_notifier(struct notifier_block *nb); 262 int unregister_inet6addr_notifier(struct notifier_block *nb); 263 int inet6addr_notifier_call_chain(unsigned long val, void *v); 264 265 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex, 266 struct ipv6_devconf *devconf); 267 268 /** 269 * __in6_dev_get - get inet6_dev pointer from netdevice 270 * @dev: network device 271 * 272 * Caller must hold rcu_read_lock or RTNL, because this function 273 * does not take a reference on the inet6_dev. 274 */ 275 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev) 276 { 277 return rcu_dereference_rtnl(dev->ip6_ptr); 278 } 279 280 /** 281 * in6_dev_get - get inet6_dev pointer from netdevice 282 * @dev: network device 283 * 284 * This version can be used in any context, and takes a reference 285 * on the inet6_dev. Callers must use in6_dev_put() later to 286 * release this reference. 287 */ 288 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev) 289 { 290 struct inet6_dev *idev; 291 292 rcu_read_lock(); 293 idev = rcu_dereference(dev->ip6_ptr); 294 if (idev) 295 atomic_inc(&idev->refcnt); 296 rcu_read_unlock(); 297 return idev; 298 } 299 300 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev) 301 { 302 struct inet6_dev *idev = __in6_dev_get(dev); 303 304 return idev ? idev->nd_parms : NULL; 305 } 306 307 void in6_dev_finish_destroy(struct inet6_dev *idev); 308 309 static inline void in6_dev_put(struct inet6_dev *idev) 310 { 311 if (atomic_dec_and_test(&idev->refcnt)) 312 in6_dev_finish_destroy(idev); 313 } 314 315 static inline void __in6_dev_put(struct inet6_dev *idev) 316 { 317 atomic_dec(&idev->refcnt); 318 } 319 320 static inline void in6_dev_hold(struct inet6_dev *idev) 321 { 322 atomic_inc(&idev->refcnt); 323 } 324 325 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp); 326 327 static inline void in6_ifa_put(struct inet6_ifaddr *ifp) 328 { 329 if (atomic_dec_and_test(&ifp->refcnt)) 330 inet6_ifa_finish_destroy(ifp); 331 } 332 333 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp) 334 { 335 atomic_dec(&ifp->refcnt); 336 } 337 338 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp) 339 { 340 atomic_inc(&ifp->refcnt); 341 } 342 343 344 /* 345 * compute link-local solicited-node multicast address 346 */ 347 348 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr, 349 struct in6_addr *solicited) 350 { 351 ipv6_addr_set(solicited, 352 htonl(0xFF020000), 0, 353 htonl(0x1), 354 htonl(0xFF000000) | addr->s6_addr32[3]); 355 } 356 357 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr) 358 { 359 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 360 __be64 *p = (__be64 *)addr; 361 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL; 362 #else 363 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 364 addr->s6_addr32[1] | addr->s6_addr32[2] | 365 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0; 366 #endif 367 } 368 369 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr) 370 { 371 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 372 __be64 *p = (__be64 *)addr; 373 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL; 374 #else 375 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 376 addr->s6_addr32[1] | addr->s6_addr32[2] | 377 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0; 378 #endif 379 } 380 381 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr) 382 { 383 return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE); 384 } 385 386 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr) 387 { 388 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 389 __be64 *p = (__be64 *)addr; 390 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | 391 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) & 392 cpu_to_be64(0xffffffffff000000UL))) == 0UL; 393 #else 394 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 395 addr->s6_addr32[1] | 396 (addr->s6_addr32[2] ^ htonl(0x00000001)) | 397 (addr->s6_addr[12] ^ 0xff)) == 0; 398 #endif 399 } 400 401 #ifdef CONFIG_PROC_FS 402 int if6_proc_init(void); 403 void if6_proc_exit(void); 404 #endif 405 406 #endif 407