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 extern int addrconf_init(void); 57 extern void addrconf_cleanup(void); 58 59 extern int addrconf_add_ifaddr(struct net *net, 60 void __user *arg); 61 extern int addrconf_del_ifaddr(struct net *net, 62 void __user *arg); 63 extern int addrconf_set_dstaddr(struct net *net, 64 void __user *arg); 65 66 extern int ipv6_chk_addr(struct net *net, 67 const struct in6_addr *addr, 68 struct net_device *dev, 69 int strict); 70 71 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 72 extern int ipv6_chk_home_addr(struct net *net, 73 const struct in6_addr *addr); 74 #endif 75 76 extern int ipv6_chk_prefix(const struct in6_addr *addr, 77 struct net_device *dev); 78 79 extern struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, 80 const struct in6_addr *addr, 81 struct net_device *dev, 82 int strict); 83 84 extern int ipv6_dev_get_saddr(struct net *net, 85 const struct net_device *dev, 86 const struct in6_addr *daddr, 87 unsigned int srcprefs, 88 struct in6_addr *saddr); 89 extern int ipv6_get_lladdr(struct net_device *dev, 90 struct in6_addr *addr, 91 unsigned char banned_flags); 92 extern int ipv6_rcv_saddr_equal(const struct sock *sk, 93 const struct sock *sk2); 94 extern void addrconf_join_solict(struct net_device *dev, 95 const struct in6_addr *addr); 96 extern void addrconf_leave_solict(struct inet6_dev *idev, 97 const struct in6_addr *addr); 98 99 static inline unsigned long addrconf_timeout_fixup(u32 timeout, 100 unsigned int unit) 101 { 102 if (timeout == 0xffffffff) 103 return ~0UL; 104 105 /* 106 * Avoid arithmetic overflow. 107 * Assuming unit is constant and non-zero, this "if" statement 108 * will go away on 64bit archs. 109 */ 110 if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit) 111 return LONG_MAX / unit; 112 113 return timeout; 114 } 115 116 static inline int addrconf_finite_timeout(unsigned long timeout) 117 { 118 return ~timeout; 119 } 120 121 /* 122 * IPv6 Address Label subsystem (addrlabel.c) 123 */ 124 extern int ipv6_addr_label_init(void); 125 extern void ipv6_addr_label_cleanup(void); 126 extern void ipv6_addr_label_rtnl_register(void); 127 extern u32 ipv6_addr_label(struct net *net, 128 const struct in6_addr *addr, 129 int type, int ifindex); 130 131 /* 132 * multicast prototypes (mcast.c) 133 */ 134 extern int ipv6_sock_mc_join(struct sock *sk, int ifindex, 135 const struct in6_addr *addr); 136 extern int ipv6_sock_mc_drop(struct sock *sk, int ifindex, 137 const struct in6_addr *addr); 138 extern void ipv6_sock_mc_close(struct sock *sk); 139 extern bool inet6_mc_check(struct sock *sk, 140 const struct in6_addr *mc_addr, 141 const struct in6_addr *src_addr); 142 143 extern int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr); 144 extern int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr); 145 extern int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr); 146 extern void ipv6_mc_up(struct inet6_dev *idev); 147 extern void ipv6_mc_down(struct inet6_dev *idev); 148 extern void ipv6_mc_unmap(struct inet6_dev *idev); 149 extern void ipv6_mc_remap(struct inet6_dev *idev); 150 extern void ipv6_mc_init_dev(struct inet6_dev *idev); 151 extern void ipv6_mc_destroy_dev(struct inet6_dev *idev); 152 extern void addrconf_dad_failure(struct inet6_ifaddr *ifp); 153 154 extern bool ipv6_chk_mcast_addr(struct net_device *dev, 155 const struct in6_addr *group, 156 const struct in6_addr *src_addr); 157 158 /* 159 * identify MLD packets for MLD filter exceptions 160 */ 161 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset) 162 { 163 struct icmp6hdr *hdr; 164 165 if (nexthdr != IPPROTO_ICMPV6 || 166 !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr))) 167 return false; 168 169 hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset); 170 171 switch (hdr->icmp6_type) { 172 case ICMPV6_MGM_QUERY: 173 case ICMPV6_MGM_REPORT: 174 case ICMPV6_MGM_REDUCTION: 175 case ICMPV6_MLD2_REPORT: 176 return true; 177 default: 178 break; 179 } 180 return false; 181 } 182 183 extern void addrconf_prefix_rcv(struct net_device *dev, 184 u8 *opt, int len, bool sllao); 185 186 /* 187 * anycast prototypes (anycast.c) 188 */ 189 extern int ipv6_sock_ac_join(struct sock *sk,int ifindex, const struct in6_addr *addr); 190 extern int ipv6_sock_ac_drop(struct sock *sk,int ifindex, const struct in6_addr *addr); 191 extern void ipv6_sock_ac_close(struct sock *sk); 192 193 extern int ipv6_dev_ac_inc(struct net_device *dev, const struct in6_addr *addr); 194 extern int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr); 195 extern bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev, 196 const struct in6_addr *addr); 197 198 199 /* Device notifier */ 200 extern int register_inet6addr_notifier(struct notifier_block *nb); 201 extern int unregister_inet6addr_notifier(struct notifier_block *nb); 202 extern int inet6addr_notifier_call_chain(unsigned long val, void *v); 203 204 extern void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex, 205 struct ipv6_devconf *devconf); 206 207 /** 208 * __in6_dev_get - get inet6_dev pointer from netdevice 209 * @dev: network device 210 * 211 * Caller must hold rcu_read_lock or RTNL, because this function 212 * does not take a reference on the inet6_dev. 213 */ 214 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev) 215 { 216 return rcu_dereference_rtnl(dev->ip6_ptr); 217 } 218 219 /** 220 * in6_dev_get - get inet6_dev pointer from netdevice 221 * @dev: network device 222 * 223 * This version can be used in any context, and takes a reference 224 * on the inet6_dev. Callers must use in6_dev_put() later to 225 * release this reference. 226 */ 227 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev) 228 { 229 struct inet6_dev *idev; 230 231 rcu_read_lock(); 232 idev = rcu_dereference(dev->ip6_ptr); 233 if (idev) 234 atomic_inc(&idev->refcnt); 235 rcu_read_unlock(); 236 return idev; 237 } 238 239 extern void in6_dev_finish_destroy(struct inet6_dev *idev); 240 241 static inline void in6_dev_put(struct inet6_dev *idev) 242 { 243 if (atomic_dec_and_test(&idev->refcnt)) 244 in6_dev_finish_destroy(idev); 245 } 246 247 static inline void __in6_dev_put(struct inet6_dev *idev) 248 { 249 atomic_dec(&idev->refcnt); 250 } 251 252 static inline void in6_dev_hold(struct inet6_dev *idev) 253 { 254 atomic_inc(&idev->refcnt); 255 } 256 257 extern void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp); 258 259 static inline void in6_ifa_put(struct inet6_ifaddr *ifp) 260 { 261 if (atomic_dec_and_test(&ifp->refcnt)) 262 inet6_ifa_finish_destroy(ifp); 263 } 264 265 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp) 266 { 267 atomic_dec(&ifp->refcnt); 268 } 269 270 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp) 271 { 272 atomic_inc(&ifp->refcnt); 273 } 274 275 276 /* 277 * compute link-local solicited-node multicast address 278 */ 279 280 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr, 281 struct in6_addr *solicited) 282 { 283 ipv6_addr_set(solicited, 284 htonl(0xFF020000), 0, 285 htonl(0x1), 286 htonl(0xFF000000) | addr->s6_addr32[3]); 287 } 288 289 static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr) 290 { 291 return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000); 292 } 293 294 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr) 295 { 296 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 297 __u64 *p = (__u64 *)addr; 298 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL; 299 #else 300 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 301 addr->s6_addr32[1] | addr->s6_addr32[2] | 302 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0; 303 #endif 304 } 305 306 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr) 307 { 308 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 309 __u64 *p = (__u64 *)addr; 310 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL; 311 #else 312 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 313 addr->s6_addr32[1] | addr->s6_addr32[2] | 314 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0; 315 #endif 316 } 317 318 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr) 319 { 320 return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE); 321 } 322 323 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr) 324 { 325 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 326 __u64 *p = (__u64 *)addr; 327 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | 328 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) & 329 cpu_to_be64(0xffffffffff000000UL))) == 0UL; 330 #else 331 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 332 addr->s6_addr32[1] | 333 (addr->s6_addr32[2] ^ htonl(0x00000001)) | 334 (addr->s6_addr[12] ^ 0xff)) == 0; 335 #endif 336 } 337 338 #ifdef CONFIG_PROC_FS 339 extern int if6_proc_init(void); 340 extern void if6_proc_exit(void); 341 #endif 342 343 #endif 344