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