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 66 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 67 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr); 68 #endif 69 70 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev); 71 72 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, 73 const struct in6_addr *addr, 74 struct net_device *dev, int strict); 75 76 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev, 77 const struct in6_addr *daddr, unsigned int srcprefs, 78 struct in6_addr *saddr); 79 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 80 unsigned char banned_flags); 81 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 82 unsigned char banned_flags); 83 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2); 84 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr); 85 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr); 86 87 static inline unsigned long addrconf_timeout_fixup(u32 timeout, 88 unsigned int unit) 89 { 90 if (timeout == 0xffffffff) 91 return ~0UL; 92 93 /* 94 * Avoid arithmetic overflow. 95 * Assuming unit is constant and non-zero, this "if" statement 96 * will go away on 64bit archs. 97 */ 98 if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit) 99 return LONG_MAX / unit; 100 101 return timeout; 102 } 103 104 static inline int addrconf_finite_timeout(unsigned long timeout) 105 { 106 return ~timeout; 107 } 108 109 /* 110 * IPv6 Address Label subsystem (addrlabel.c) 111 */ 112 int ipv6_addr_label_init(void); 113 void ipv6_addr_label_cleanup(void); 114 void ipv6_addr_label_rtnl_register(void); 115 u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr, 116 int type, int ifindex); 117 118 /* 119 * multicast prototypes (mcast.c) 120 */ 121 int ipv6_sock_mc_join(struct sock *sk, int ifindex, 122 const struct in6_addr *addr); 123 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, 124 const struct in6_addr *addr); 125 void ipv6_sock_mc_close(struct sock *sk); 126 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr, 127 const struct in6_addr *src_addr); 128 129 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr); 130 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr); 131 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr); 132 void ipv6_mc_up(struct inet6_dev *idev); 133 void ipv6_mc_down(struct inet6_dev *idev); 134 void ipv6_mc_unmap(struct inet6_dev *idev); 135 void ipv6_mc_remap(struct inet6_dev *idev); 136 void ipv6_mc_init_dev(struct inet6_dev *idev); 137 void ipv6_mc_destroy_dev(struct inet6_dev *idev); 138 void addrconf_dad_failure(struct inet6_ifaddr *ifp); 139 140 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, 141 const struct in6_addr *src_addr); 142 143 void ipv6_mc_dad_complete(struct inet6_dev *idev); 144 145 /* A stub used by vxlan module. This is ugly, ideally these 146 * symbols should be built into the core kernel. 147 */ 148 struct ipv6_stub { 149 int (*ipv6_sock_mc_join)(struct sock *sk, int ifindex, 150 const struct in6_addr *addr); 151 int (*ipv6_sock_mc_drop)(struct sock *sk, int ifindex, 152 const struct in6_addr *addr); 153 int (*ipv6_dst_lookup)(struct sock *sk, struct dst_entry **dst, 154 struct flowi6 *fl6); 155 void (*udpv6_encap_enable)(void); 156 void (*ndisc_send_na)(struct net_device *dev, struct neighbour *neigh, 157 const struct in6_addr *daddr, 158 const struct in6_addr *solicited_addr, 159 bool router, bool solicited, bool override, bool inc_opt); 160 struct neigh_table *nd_tbl; 161 }; 162 extern const struct ipv6_stub *ipv6_stub __read_mostly; 163 164 /* 165 * identify MLD packets for MLD filter exceptions 166 */ 167 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset) 168 { 169 struct icmp6hdr *hdr; 170 171 if (nexthdr != IPPROTO_ICMPV6 || 172 !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr))) 173 return false; 174 175 hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset); 176 177 switch (hdr->icmp6_type) { 178 case ICMPV6_MGM_QUERY: 179 case ICMPV6_MGM_REPORT: 180 case ICMPV6_MGM_REDUCTION: 181 case ICMPV6_MLD2_REPORT: 182 return true; 183 default: 184 break; 185 } 186 return false; 187 } 188 189 void addrconf_prefix_rcv(struct net_device *dev, 190 u8 *opt, int len, bool sllao); 191 192 /* 193 * anycast prototypes (anycast.c) 194 */ 195 int ipv6_sock_ac_join(struct sock *sk, int ifindex, 196 const struct in6_addr *addr); 197 int ipv6_sock_ac_drop(struct sock *sk, int ifindex, 198 const struct in6_addr *addr); 199 void ipv6_sock_ac_close(struct sock *sk); 200 201 int ipv6_dev_ac_inc(struct net_device *dev, const struct in6_addr *addr); 202 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr); 203 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev, 204 const struct in6_addr *addr); 205 206 207 /* Device notifier */ 208 int register_inet6addr_notifier(struct notifier_block *nb); 209 int unregister_inet6addr_notifier(struct notifier_block *nb); 210 int inet6addr_notifier_call_chain(unsigned long val, void *v); 211 212 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex, 213 struct ipv6_devconf *devconf); 214 215 /** 216 * __in6_dev_get - get inet6_dev pointer from netdevice 217 * @dev: network device 218 * 219 * Caller must hold rcu_read_lock or RTNL, because this function 220 * does not take a reference on the inet6_dev. 221 */ 222 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev) 223 { 224 return rcu_dereference_rtnl(dev->ip6_ptr); 225 } 226 227 /** 228 * in6_dev_get - get inet6_dev pointer from netdevice 229 * @dev: network device 230 * 231 * This version can be used in any context, and takes a reference 232 * on the inet6_dev. Callers must use in6_dev_put() later to 233 * release this reference. 234 */ 235 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev) 236 { 237 struct inet6_dev *idev; 238 239 rcu_read_lock(); 240 idev = rcu_dereference(dev->ip6_ptr); 241 if (idev) 242 atomic_inc(&idev->refcnt); 243 rcu_read_unlock(); 244 return idev; 245 } 246 247 void in6_dev_finish_destroy(struct inet6_dev *idev); 248 249 static inline void in6_dev_put(struct inet6_dev *idev) 250 { 251 if (atomic_dec_and_test(&idev->refcnt)) 252 in6_dev_finish_destroy(idev); 253 } 254 255 static inline void __in6_dev_put(struct inet6_dev *idev) 256 { 257 atomic_dec(&idev->refcnt); 258 } 259 260 static inline void in6_dev_hold(struct inet6_dev *idev) 261 { 262 atomic_inc(&idev->refcnt); 263 } 264 265 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp); 266 267 static inline void in6_ifa_put(struct inet6_ifaddr *ifp) 268 { 269 if (atomic_dec_and_test(&ifp->refcnt)) 270 inet6_ifa_finish_destroy(ifp); 271 } 272 273 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp) 274 { 275 atomic_dec(&ifp->refcnt); 276 } 277 278 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp) 279 { 280 atomic_inc(&ifp->refcnt); 281 } 282 283 284 /* 285 * compute link-local solicited-node multicast address 286 */ 287 288 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr, 289 struct in6_addr *solicited) 290 { 291 ipv6_addr_set(solicited, 292 htonl(0xFF020000), 0, 293 htonl(0x1), 294 htonl(0xFF000000) | addr->s6_addr32[3]); 295 } 296 297 static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr) 298 { 299 return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000); 300 } 301 302 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr) 303 { 304 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 305 __u64 *p = (__u64 *)addr; 306 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL; 307 #else 308 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 309 addr->s6_addr32[1] | addr->s6_addr32[2] | 310 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0; 311 #endif 312 } 313 314 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr) 315 { 316 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 317 __u64 *p = (__u64 *)addr; 318 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL; 319 #else 320 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 321 addr->s6_addr32[1] | addr->s6_addr32[2] | 322 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0; 323 #endif 324 } 325 326 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr) 327 { 328 return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE); 329 } 330 331 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr) 332 { 333 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 334 __u64 *p = (__u64 *)addr; 335 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | 336 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) & 337 cpu_to_be64(0xffffffffff000000UL))) == 0UL; 338 #else 339 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 340 addr->s6_addr32[1] | 341 (addr->s6_addr32[2] ^ htonl(0x00000001)) | 342 (addr->s6_addr[12] ^ 0xff)) == 0; 343 #endif 344 } 345 346 #ifdef CONFIG_PROC_FS 347 int if6_proc_init(void); 348 void if6_proc_exit(void); 349 #endif 350 351 #endif 352