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 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr); 92 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr); 93 94 static inline unsigned long addrconf_timeout_fixup(u32 timeout, 95 unsigned int unit) 96 { 97 if (timeout == 0xffffffff) 98 return ~0UL; 99 100 /* 101 * Avoid arithmetic overflow. 102 * Assuming unit is constant and non-zero, this "if" statement 103 * will go away on 64bit archs. 104 */ 105 if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit) 106 return LONG_MAX / unit; 107 108 return timeout; 109 } 110 111 static inline int addrconf_finite_timeout(unsigned long timeout) 112 { 113 return ~timeout; 114 } 115 116 /* 117 * IPv6 Address Label subsystem (addrlabel.c) 118 */ 119 int ipv6_addr_label_init(void); 120 void ipv6_addr_label_cleanup(void); 121 void ipv6_addr_label_rtnl_register(void); 122 u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr, 123 int type, int ifindex); 124 125 /* 126 * multicast prototypes (mcast.c) 127 */ 128 int ipv6_sock_mc_join(struct sock *sk, int ifindex, 129 const struct in6_addr *addr); 130 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, 131 const struct in6_addr *addr); 132 void ipv6_sock_mc_close(struct sock *sk); 133 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr, 134 const struct in6_addr *src_addr); 135 136 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr); 137 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr); 138 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr); 139 void ipv6_mc_up(struct inet6_dev *idev); 140 void ipv6_mc_down(struct inet6_dev *idev); 141 void ipv6_mc_unmap(struct inet6_dev *idev); 142 void ipv6_mc_remap(struct inet6_dev *idev); 143 void ipv6_mc_init_dev(struct inet6_dev *idev); 144 void ipv6_mc_destroy_dev(struct inet6_dev *idev); 145 void addrconf_dad_failure(struct inet6_ifaddr *ifp); 146 147 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, 148 const struct in6_addr *src_addr); 149 150 void ipv6_mc_dad_complete(struct inet6_dev *idev); 151 152 /* A stub used by vxlan module. This is ugly, ideally these 153 * symbols should be built into the core kernel. 154 */ 155 struct ipv6_stub { 156 int (*ipv6_sock_mc_join)(struct sock *sk, int ifindex, 157 const struct in6_addr *addr); 158 int (*ipv6_sock_mc_drop)(struct sock *sk, int ifindex, 159 const struct in6_addr *addr); 160 int (*ipv6_dst_lookup)(struct sock *sk, struct dst_entry **dst, 161 struct flowi6 *fl6); 162 void (*udpv6_encap_enable)(void); 163 void (*ndisc_send_na)(struct net_device *dev, struct neighbour *neigh, 164 const struct in6_addr *daddr, 165 const struct in6_addr *solicited_addr, 166 bool router, bool solicited, bool override, bool inc_opt); 167 struct neigh_table *nd_tbl; 168 }; 169 extern const struct ipv6_stub *ipv6_stub __read_mostly; 170 171 /* 172 * identify MLD packets for MLD filter exceptions 173 */ 174 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset) 175 { 176 struct icmp6hdr *hdr; 177 178 if (nexthdr != IPPROTO_ICMPV6 || 179 !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr))) 180 return false; 181 182 hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset); 183 184 switch (hdr->icmp6_type) { 185 case ICMPV6_MGM_QUERY: 186 case ICMPV6_MGM_REPORT: 187 case ICMPV6_MGM_REDUCTION: 188 case ICMPV6_MLD2_REPORT: 189 return true; 190 default: 191 break; 192 } 193 return false; 194 } 195 196 void addrconf_prefix_rcv(struct net_device *dev, 197 u8 *opt, int len, bool sllao); 198 199 /* 200 * anycast prototypes (anycast.c) 201 */ 202 int ipv6_sock_ac_join(struct sock *sk, int ifindex, 203 const struct in6_addr *addr); 204 int ipv6_sock_ac_drop(struct sock *sk, int ifindex, 205 const struct in6_addr *addr); 206 void ipv6_sock_ac_close(struct sock *sk); 207 208 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr); 209 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr); 210 void ipv6_ac_destroy_dev(struct inet6_dev *idev); 211 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev, 212 const struct in6_addr *addr); 213 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev, 214 const struct in6_addr *addr); 215 216 /* Device notifier */ 217 int register_inet6addr_notifier(struct notifier_block *nb); 218 int unregister_inet6addr_notifier(struct notifier_block *nb); 219 int inet6addr_notifier_call_chain(unsigned long val, void *v); 220 221 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex, 222 struct ipv6_devconf *devconf); 223 224 /** 225 * __in6_dev_get - get inet6_dev pointer from netdevice 226 * @dev: network device 227 * 228 * Caller must hold rcu_read_lock or RTNL, because this function 229 * does not take a reference on the inet6_dev. 230 */ 231 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev) 232 { 233 return rcu_dereference_rtnl(dev->ip6_ptr); 234 } 235 236 /** 237 * in6_dev_get - get inet6_dev pointer from netdevice 238 * @dev: network device 239 * 240 * This version can be used in any context, and takes a reference 241 * on the inet6_dev. Callers must use in6_dev_put() later to 242 * release this reference. 243 */ 244 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev) 245 { 246 struct inet6_dev *idev; 247 248 rcu_read_lock(); 249 idev = rcu_dereference(dev->ip6_ptr); 250 if (idev) 251 atomic_inc(&idev->refcnt); 252 rcu_read_unlock(); 253 return idev; 254 } 255 256 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev) 257 { 258 struct inet6_dev *idev = __in6_dev_get(dev); 259 260 return idev ? idev->nd_parms : NULL; 261 } 262 263 void in6_dev_finish_destroy(struct inet6_dev *idev); 264 265 static inline void in6_dev_put(struct inet6_dev *idev) 266 { 267 if (atomic_dec_and_test(&idev->refcnt)) 268 in6_dev_finish_destroy(idev); 269 } 270 271 static inline void __in6_dev_put(struct inet6_dev *idev) 272 { 273 atomic_dec(&idev->refcnt); 274 } 275 276 static inline void in6_dev_hold(struct inet6_dev *idev) 277 { 278 atomic_inc(&idev->refcnt); 279 } 280 281 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp); 282 283 static inline void in6_ifa_put(struct inet6_ifaddr *ifp) 284 { 285 if (atomic_dec_and_test(&ifp->refcnt)) 286 inet6_ifa_finish_destroy(ifp); 287 } 288 289 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp) 290 { 291 atomic_dec(&ifp->refcnt); 292 } 293 294 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp) 295 { 296 atomic_inc(&ifp->refcnt); 297 } 298 299 300 /* 301 * compute link-local solicited-node multicast address 302 */ 303 304 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr, 305 struct in6_addr *solicited) 306 { 307 ipv6_addr_set(solicited, 308 htonl(0xFF020000), 0, 309 htonl(0x1), 310 htonl(0xFF000000) | addr->s6_addr32[3]); 311 } 312 313 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr) 314 { 315 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 316 __be64 *p = (__be64 *)addr; 317 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL; 318 #else 319 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 320 addr->s6_addr32[1] | addr->s6_addr32[2] | 321 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0; 322 #endif 323 } 324 325 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr) 326 { 327 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 328 __be64 *p = (__be64 *)addr; 329 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL; 330 #else 331 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 332 addr->s6_addr32[1] | addr->s6_addr32[2] | 333 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0; 334 #endif 335 } 336 337 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr) 338 { 339 return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE); 340 } 341 342 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr) 343 { 344 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 345 __be64 *p = (__be64 *)addr; 346 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | 347 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) & 348 cpu_to_be64(0xffffffffff000000UL))) == 0UL; 349 #else 350 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 351 addr->s6_addr32[1] | 352 (addr->s6_addr32[2] ^ htonl(0x00000001)) | 353 (addr->s6_addr[12] ^ 0xff)) == 0; 354 #endif 355 } 356 357 #ifdef CONFIG_PROC_FS 358 int if6_proc_init(void); 359 void if6_proc_exit(void); 360 #endif 361 362 #endif 363