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 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 71 const unsigned int prefix_len, 72 struct net_device *dev); 73 74 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev); 75 76 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, 77 const struct in6_addr *addr, 78 struct net_device *dev, int strict); 79 80 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev, 81 const struct in6_addr *daddr, unsigned int srcprefs, 82 struct in6_addr *saddr); 83 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 84 u32 banned_flags); 85 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 86 u32 banned_flags); 87 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2); 88 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr); 89 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr); 90 91 static inline unsigned long addrconf_timeout_fixup(u32 timeout, 92 unsigned int unit) 93 { 94 if (timeout == 0xffffffff) 95 return ~0UL; 96 97 /* 98 * Avoid arithmetic overflow. 99 * Assuming unit is constant and non-zero, this "if" statement 100 * will go away on 64bit archs. 101 */ 102 if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit) 103 return LONG_MAX / unit; 104 105 return timeout; 106 } 107 108 static inline int addrconf_finite_timeout(unsigned long timeout) 109 { 110 return ~timeout; 111 } 112 113 /* 114 * IPv6 Address Label subsystem (addrlabel.c) 115 */ 116 int ipv6_addr_label_init(void); 117 void ipv6_addr_label_cleanup(void); 118 void ipv6_addr_label_rtnl_register(void); 119 u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr, 120 int type, int ifindex); 121 122 /* 123 * multicast prototypes (mcast.c) 124 */ 125 int ipv6_sock_mc_join(struct sock *sk, int ifindex, 126 const struct in6_addr *addr); 127 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, 128 const struct in6_addr *addr); 129 void ipv6_sock_mc_close(struct sock *sk); 130 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr, 131 const struct in6_addr *src_addr); 132 133 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr); 134 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr); 135 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr); 136 void ipv6_mc_up(struct inet6_dev *idev); 137 void ipv6_mc_down(struct inet6_dev *idev); 138 void ipv6_mc_unmap(struct inet6_dev *idev); 139 void ipv6_mc_remap(struct inet6_dev *idev); 140 void ipv6_mc_init_dev(struct inet6_dev *idev); 141 void ipv6_mc_destroy_dev(struct inet6_dev *idev); 142 void addrconf_dad_failure(struct inet6_ifaddr *ifp); 143 144 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, 145 const struct in6_addr *src_addr); 146 147 void ipv6_mc_dad_complete(struct inet6_dev *idev); 148 149 /* A stub used by vxlan module. This is ugly, ideally these 150 * symbols should be built into the core kernel. 151 */ 152 struct ipv6_stub { 153 int (*ipv6_sock_mc_join)(struct sock *sk, int ifindex, 154 const struct in6_addr *addr); 155 int (*ipv6_sock_mc_drop)(struct sock *sk, int ifindex, 156 const struct in6_addr *addr); 157 int (*ipv6_dst_lookup)(struct sock *sk, struct dst_entry **dst, 158 struct flowi6 *fl6); 159 void (*udpv6_encap_enable)(void); 160 void (*ndisc_send_na)(struct net_device *dev, struct neighbour *neigh, 161 const struct in6_addr *daddr, 162 const struct in6_addr *solicited_addr, 163 bool router, bool solicited, bool override, bool inc_opt); 164 struct neigh_table *nd_tbl; 165 }; 166 extern const struct ipv6_stub *ipv6_stub __read_mostly; 167 168 /* 169 * identify MLD packets for MLD filter exceptions 170 */ 171 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset) 172 { 173 struct icmp6hdr *hdr; 174 175 if (nexthdr != IPPROTO_ICMPV6 || 176 !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr))) 177 return false; 178 179 hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset); 180 181 switch (hdr->icmp6_type) { 182 case ICMPV6_MGM_QUERY: 183 case ICMPV6_MGM_REPORT: 184 case ICMPV6_MGM_REDUCTION: 185 case ICMPV6_MLD2_REPORT: 186 return true; 187 default: 188 break; 189 } 190 return false; 191 } 192 193 void addrconf_prefix_rcv(struct net_device *dev, 194 u8 *opt, int len, bool sllao); 195 196 /* 197 * anycast prototypes (anycast.c) 198 */ 199 int ipv6_sock_ac_join(struct sock *sk, int ifindex, 200 const struct in6_addr *addr); 201 int ipv6_sock_ac_drop(struct sock *sk, int ifindex, 202 const struct in6_addr *addr); 203 void ipv6_sock_ac_close(struct sock *sk); 204 205 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr); 206 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr); 207 void ipv6_ac_destroy_dev(struct inet6_dev *idev); 208 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev, 209 const struct in6_addr *addr); 210 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev, 211 const struct in6_addr *addr); 212 213 /* Device notifier */ 214 int register_inet6addr_notifier(struct notifier_block *nb); 215 int unregister_inet6addr_notifier(struct notifier_block *nb); 216 int inet6addr_notifier_call_chain(unsigned long val, void *v); 217 218 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex, 219 struct ipv6_devconf *devconf); 220 221 /** 222 * __in6_dev_get - get inet6_dev pointer from netdevice 223 * @dev: network device 224 * 225 * Caller must hold rcu_read_lock or RTNL, because this function 226 * does not take a reference on the inet6_dev. 227 */ 228 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev) 229 { 230 return rcu_dereference_rtnl(dev->ip6_ptr); 231 } 232 233 /** 234 * in6_dev_get - get inet6_dev pointer from netdevice 235 * @dev: network device 236 * 237 * This version can be used in any context, and takes a reference 238 * on the inet6_dev. Callers must use in6_dev_put() later to 239 * release this reference. 240 */ 241 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev) 242 { 243 struct inet6_dev *idev; 244 245 rcu_read_lock(); 246 idev = rcu_dereference(dev->ip6_ptr); 247 if (idev) 248 atomic_inc(&idev->refcnt); 249 rcu_read_unlock(); 250 return idev; 251 } 252 253 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev) 254 { 255 struct inet6_dev *idev = __in6_dev_get(dev); 256 257 return idev ? idev->nd_parms : NULL; 258 } 259 260 void in6_dev_finish_destroy(struct inet6_dev *idev); 261 262 static inline void in6_dev_put(struct inet6_dev *idev) 263 { 264 if (atomic_dec_and_test(&idev->refcnt)) 265 in6_dev_finish_destroy(idev); 266 } 267 268 static inline void __in6_dev_put(struct inet6_dev *idev) 269 { 270 atomic_dec(&idev->refcnt); 271 } 272 273 static inline void in6_dev_hold(struct inet6_dev *idev) 274 { 275 atomic_inc(&idev->refcnt); 276 } 277 278 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp); 279 280 static inline void in6_ifa_put(struct inet6_ifaddr *ifp) 281 { 282 if (atomic_dec_and_test(&ifp->refcnt)) 283 inet6_ifa_finish_destroy(ifp); 284 } 285 286 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp) 287 { 288 atomic_dec(&ifp->refcnt); 289 } 290 291 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp) 292 { 293 atomic_inc(&ifp->refcnt); 294 } 295 296 297 /* 298 * compute link-local solicited-node multicast address 299 */ 300 301 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr, 302 struct in6_addr *solicited) 303 { 304 ipv6_addr_set(solicited, 305 htonl(0xFF020000), 0, 306 htonl(0x1), 307 htonl(0xFF000000) | addr->s6_addr32[3]); 308 } 309 310 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr) 311 { 312 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 313 __be64 *p = (__be64 *)addr; 314 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL; 315 #else 316 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 317 addr->s6_addr32[1] | addr->s6_addr32[2] | 318 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0; 319 #endif 320 } 321 322 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr) 323 { 324 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 325 __be64 *p = (__be64 *)addr; 326 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL; 327 #else 328 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 329 addr->s6_addr32[1] | addr->s6_addr32[2] | 330 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0; 331 #endif 332 } 333 334 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr) 335 { 336 return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE); 337 } 338 339 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr) 340 { 341 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 342 __be64 *p = (__be64 *)addr; 343 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | 344 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) & 345 cpu_to_be64(0xffffffffff000000UL))) == 0UL; 346 #else 347 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 348 addr->s6_addr32[1] | 349 (addr->s6_addr32[2] ^ htonl(0x00000001)) | 350 (addr->s6_addr[12] ^ 0xff)) == 0; 351 #endif 352 } 353 354 #ifdef CONFIG_PROC_FS 355 int if6_proc_init(void); 356 void if6_proc_exit(void); 357 #endif 358 359 #endif 360