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 ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2, 91 bool match_wildcard); 92 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr); 93 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr); 94 95 static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 96 { 97 if (dev->addr_len != ETH_ALEN) 98 return -1; 99 memcpy(eui, dev->dev_addr, 3); 100 memcpy(eui + 5, dev->dev_addr + 3, 3); 101 102 /* 103 * The zSeries OSA network cards can be shared among various 104 * OS instances, but the OSA cards have only one MAC address. 105 * This leads to duplicate address conflicts in conjunction 106 * with IPv6 if more than one instance uses the same card. 107 * 108 * The driver for these cards can deliver a unique 16-bit 109 * identifier for each instance sharing the same card. It is 110 * placed instead of 0xFFFE in the interface identifier. The 111 * "u" bit of the interface identifier is not inverted in this 112 * case. Hence the resulting interface identifier has local 113 * scope according to RFC2373. 114 */ 115 if (dev->dev_id) { 116 eui[3] = (dev->dev_id >> 8) & 0xFF; 117 eui[4] = dev->dev_id & 0xFF; 118 } else { 119 eui[3] = 0xFF; 120 eui[4] = 0xFE; 121 eui[0] ^= 2; 122 } 123 return 0; 124 } 125 126 static inline unsigned long addrconf_timeout_fixup(u32 timeout, 127 unsigned int unit) 128 { 129 if (timeout == 0xffffffff) 130 return ~0UL; 131 132 /* 133 * Avoid arithmetic overflow. 134 * Assuming unit is constant and non-zero, this "if" statement 135 * will go away on 64bit archs. 136 */ 137 if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit) 138 return LONG_MAX / unit; 139 140 return timeout; 141 } 142 143 static inline int addrconf_finite_timeout(unsigned long timeout) 144 { 145 return ~timeout; 146 } 147 148 /* 149 * IPv6 Address Label subsystem (addrlabel.c) 150 */ 151 int ipv6_addr_label_init(void); 152 void ipv6_addr_label_cleanup(void); 153 void ipv6_addr_label_rtnl_register(void); 154 u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr, 155 int type, int ifindex); 156 157 /* 158 * multicast prototypes (mcast.c) 159 */ 160 int ipv6_sock_mc_join(struct sock *sk, int ifindex, 161 const struct in6_addr *addr); 162 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, 163 const struct in6_addr *addr); 164 void ipv6_sock_mc_close(struct sock *sk); 165 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr, 166 const struct in6_addr *src_addr); 167 168 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr); 169 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr); 170 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr); 171 void ipv6_mc_up(struct inet6_dev *idev); 172 void ipv6_mc_down(struct inet6_dev *idev); 173 void ipv6_mc_unmap(struct inet6_dev *idev); 174 void ipv6_mc_remap(struct inet6_dev *idev); 175 void ipv6_mc_init_dev(struct inet6_dev *idev); 176 void ipv6_mc_destroy_dev(struct inet6_dev *idev); 177 int ipv6_mc_check_mld(struct sk_buff *skb, struct sk_buff **skb_trimmed); 178 void addrconf_dad_failure(struct inet6_ifaddr *ifp); 179 180 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, 181 const struct in6_addr *src_addr); 182 183 void ipv6_mc_dad_complete(struct inet6_dev *idev); 184 185 /* A stub used by vxlan module. This is ugly, ideally these 186 * symbols should be built into the core kernel. 187 */ 188 struct ipv6_stub { 189 int (*ipv6_sock_mc_join)(struct sock *sk, int ifindex, 190 const struct in6_addr *addr); 191 int (*ipv6_sock_mc_drop)(struct sock *sk, int ifindex, 192 const struct in6_addr *addr); 193 int (*ipv6_dst_lookup)(struct net *net, struct sock *sk, 194 struct dst_entry **dst, struct flowi6 *fl6); 195 void (*udpv6_encap_enable)(void); 196 void (*ndisc_send_na)(struct net_device *dev, const struct in6_addr *daddr, 197 const struct in6_addr *solicited_addr, 198 bool router, bool solicited, bool override, bool inc_opt); 199 struct neigh_table *nd_tbl; 200 }; 201 extern const struct ipv6_stub *ipv6_stub __read_mostly; 202 203 /* 204 * identify MLD packets for MLD filter exceptions 205 */ 206 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset) 207 { 208 struct icmp6hdr *hdr; 209 210 if (nexthdr != IPPROTO_ICMPV6 || 211 !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr))) 212 return false; 213 214 hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset); 215 216 switch (hdr->icmp6_type) { 217 case ICMPV6_MGM_QUERY: 218 case ICMPV6_MGM_REPORT: 219 case ICMPV6_MGM_REDUCTION: 220 case ICMPV6_MLD2_REPORT: 221 return true; 222 default: 223 break; 224 } 225 return false; 226 } 227 228 void addrconf_prefix_rcv(struct net_device *dev, 229 u8 *opt, int len, bool sllao); 230 231 /* 232 * anycast prototypes (anycast.c) 233 */ 234 int ipv6_sock_ac_join(struct sock *sk, int ifindex, 235 const struct in6_addr *addr); 236 int ipv6_sock_ac_drop(struct sock *sk, int ifindex, 237 const struct in6_addr *addr); 238 void ipv6_sock_ac_close(struct sock *sk); 239 240 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr); 241 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr); 242 void ipv6_ac_destroy_dev(struct inet6_dev *idev); 243 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev, 244 const struct in6_addr *addr); 245 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev, 246 const struct in6_addr *addr); 247 248 /* Device notifier */ 249 int register_inet6addr_notifier(struct notifier_block *nb); 250 int unregister_inet6addr_notifier(struct notifier_block *nb); 251 int inet6addr_notifier_call_chain(unsigned long val, void *v); 252 253 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex, 254 struct ipv6_devconf *devconf); 255 256 /** 257 * __in6_dev_get - get inet6_dev pointer from netdevice 258 * @dev: network device 259 * 260 * Caller must hold rcu_read_lock or RTNL, because this function 261 * does not take a reference on the inet6_dev. 262 */ 263 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev) 264 { 265 return rcu_dereference_rtnl(dev->ip6_ptr); 266 } 267 268 /** 269 * in6_dev_get - get inet6_dev pointer from netdevice 270 * @dev: network device 271 * 272 * This version can be used in any context, and takes a reference 273 * on the inet6_dev. Callers must use in6_dev_put() later to 274 * release this reference. 275 */ 276 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev) 277 { 278 struct inet6_dev *idev; 279 280 rcu_read_lock(); 281 idev = rcu_dereference(dev->ip6_ptr); 282 if (idev) 283 atomic_inc(&idev->refcnt); 284 rcu_read_unlock(); 285 return idev; 286 } 287 288 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev) 289 { 290 struct inet6_dev *idev = __in6_dev_get(dev); 291 292 return idev ? idev->nd_parms : NULL; 293 } 294 295 void in6_dev_finish_destroy(struct inet6_dev *idev); 296 297 static inline void in6_dev_put(struct inet6_dev *idev) 298 { 299 if (atomic_dec_and_test(&idev->refcnt)) 300 in6_dev_finish_destroy(idev); 301 } 302 303 static inline void __in6_dev_put(struct inet6_dev *idev) 304 { 305 atomic_dec(&idev->refcnt); 306 } 307 308 static inline void in6_dev_hold(struct inet6_dev *idev) 309 { 310 atomic_inc(&idev->refcnt); 311 } 312 313 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp); 314 315 static inline void in6_ifa_put(struct inet6_ifaddr *ifp) 316 { 317 if (atomic_dec_and_test(&ifp->refcnt)) 318 inet6_ifa_finish_destroy(ifp); 319 } 320 321 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp) 322 { 323 atomic_dec(&ifp->refcnt); 324 } 325 326 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp) 327 { 328 atomic_inc(&ifp->refcnt); 329 } 330 331 332 /* 333 * compute link-local solicited-node multicast address 334 */ 335 336 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr, 337 struct in6_addr *solicited) 338 { 339 ipv6_addr_set(solicited, 340 htonl(0xFF020000), 0, 341 htonl(0x1), 342 htonl(0xFF000000) | addr->s6_addr32[3]); 343 } 344 345 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr) 346 { 347 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 348 __be64 *p = (__be64 *)addr; 349 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL; 350 #else 351 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 352 addr->s6_addr32[1] | addr->s6_addr32[2] | 353 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0; 354 #endif 355 } 356 357 static inline bool ipv6_addr_is_ll_all_routers(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(2))) == 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(0x00000002))) == 0; 366 #endif 367 } 368 369 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr) 370 { 371 return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE); 372 } 373 374 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr) 375 { 376 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 377 __be64 *p = (__be64 *)addr; 378 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | 379 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) & 380 cpu_to_be64(0xffffffffff000000UL))) == 0UL; 381 #else 382 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 383 addr->s6_addr32[1] | 384 (addr->s6_addr32[2] ^ htonl(0x00000001)) | 385 (addr->s6_addr[12] ^ 0xff)) == 0; 386 #endif 387 } 388 389 #ifdef CONFIG_PROC_FS 390 int if6_proc_init(void); 391 void if6_proc_exit(void); 392 #endif 393 394 #endif 395