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 int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 95 { 96 if (dev->addr_len != ETH_ALEN) 97 return -1; 98 memcpy(eui, dev->dev_addr, 3); 99 memcpy(eui + 5, dev->dev_addr + 3, 3); 100 101 /* 102 * The zSeries OSA network cards can be shared among various 103 * OS instances, but the OSA cards have only one MAC address. 104 * This leads to duplicate address conflicts in conjunction 105 * with IPv6 if more than one instance uses the same card. 106 * 107 * The driver for these cards can deliver a unique 16-bit 108 * identifier for each instance sharing the same card. It is 109 * placed instead of 0xFFFE in the interface identifier. The 110 * "u" bit of the interface identifier is not inverted in this 111 * case. Hence the resulting interface identifier has local 112 * scope according to RFC2373. 113 */ 114 if (dev->dev_id) { 115 eui[3] = (dev->dev_id >> 8) & 0xFF; 116 eui[4] = dev->dev_id & 0xFF; 117 } else { 118 eui[3] = 0xFF; 119 eui[4] = 0xFE; 120 eui[0] ^= 2; 121 } 122 return 0; 123 } 124 125 static inline unsigned long addrconf_timeout_fixup(u32 timeout, 126 unsigned int unit) 127 { 128 if (timeout == 0xffffffff) 129 return ~0UL; 130 131 /* 132 * Avoid arithmetic overflow. 133 * Assuming unit is constant and non-zero, this "if" statement 134 * will go away on 64bit archs. 135 */ 136 if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit) 137 return LONG_MAX / unit; 138 139 return timeout; 140 } 141 142 static inline int addrconf_finite_timeout(unsigned long timeout) 143 { 144 return ~timeout; 145 } 146 147 /* 148 * IPv6 Address Label subsystem (addrlabel.c) 149 */ 150 int ipv6_addr_label_init(void); 151 void ipv6_addr_label_cleanup(void); 152 void ipv6_addr_label_rtnl_register(void); 153 u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr, 154 int type, int ifindex); 155 156 /* 157 * multicast prototypes (mcast.c) 158 */ 159 int ipv6_sock_mc_join(struct sock *sk, int ifindex, 160 const struct in6_addr *addr); 161 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, 162 const struct in6_addr *addr); 163 void ipv6_sock_mc_close(struct sock *sk); 164 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr, 165 const struct in6_addr *src_addr); 166 167 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr); 168 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr); 169 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr); 170 void ipv6_mc_up(struct inet6_dev *idev); 171 void ipv6_mc_down(struct inet6_dev *idev); 172 void ipv6_mc_unmap(struct inet6_dev *idev); 173 void ipv6_mc_remap(struct inet6_dev *idev); 174 void ipv6_mc_init_dev(struct inet6_dev *idev); 175 void ipv6_mc_destroy_dev(struct inet6_dev *idev); 176 int ipv6_mc_check_mld(struct sk_buff *skb, struct sk_buff **skb_trimmed); 177 void addrconf_dad_failure(struct inet6_ifaddr *ifp); 178 179 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, 180 const struct in6_addr *src_addr); 181 182 void ipv6_mc_dad_complete(struct inet6_dev *idev); 183 184 /* A stub used by vxlan module. This is ugly, ideally these 185 * symbols should be built into the core kernel. 186 */ 187 struct ipv6_stub { 188 int (*ipv6_sock_mc_join)(struct sock *sk, int ifindex, 189 const struct in6_addr *addr); 190 int (*ipv6_sock_mc_drop)(struct sock *sk, int ifindex, 191 const struct in6_addr *addr); 192 int (*ipv6_dst_lookup)(struct net *net, struct sock *sk, 193 struct dst_entry **dst, struct flowi6 *fl6); 194 void (*udpv6_encap_enable)(void); 195 void (*ndisc_send_na)(struct net_device *dev, const struct in6_addr *daddr, 196 const struct in6_addr *solicited_addr, 197 bool router, bool solicited, bool override, bool inc_opt); 198 struct neigh_table *nd_tbl; 199 }; 200 extern const struct ipv6_stub *ipv6_stub __read_mostly; 201 202 /* 203 * identify MLD packets for MLD filter exceptions 204 */ 205 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset) 206 { 207 struct icmp6hdr *hdr; 208 209 if (nexthdr != IPPROTO_ICMPV6 || 210 !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr))) 211 return false; 212 213 hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset); 214 215 switch (hdr->icmp6_type) { 216 case ICMPV6_MGM_QUERY: 217 case ICMPV6_MGM_REPORT: 218 case ICMPV6_MGM_REDUCTION: 219 case ICMPV6_MLD2_REPORT: 220 return true; 221 default: 222 break; 223 } 224 return false; 225 } 226 227 void addrconf_prefix_rcv(struct net_device *dev, 228 u8 *opt, int len, bool sllao); 229 230 /* 231 * anycast prototypes (anycast.c) 232 */ 233 int ipv6_sock_ac_join(struct sock *sk, int ifindex, 234 const struct in6_addr *addr); 235 int ipv6_sock_ac_drop(struct sock *sk, int ifindex, 236 const struct in6_addr *addr); 237 void ipv6_sock_ac_close(struct sock *sk); 238 239 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr); 240 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr); 241 void ipv6_ac_destroy_dev(struct inet6_dev *idev); 242 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev, 243 const struct in6_addr *addr); 244 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev, 245 const struct in6_addr *addr); 246 247 /* Device notifier */ 248 int register_inet6addr_notifier(struct notifier_block *nb); 249 int unregister_inet6addr_notifier(struct notifier_block *nb); 250 int inet6addr_notifier_call_chain(unsigned long val, void *v); 251 252 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex, 253 struct ipv6_devconf *devconf); 254 255 /** 256 * __in6_dev_get - get inet6_dev pointer from netdevice 257 * @dev: network device 258 * 259 * Caller must hold rcu_read_lock or RTNL, because this function 260 * does not take a reference on the inet6_dev. 261 */ 262 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev) 263 { 264 return rcu_dereference_rtnl(dev->ip6_ptr); 265 } 266 267 /** 268 * in6_dev_get - get inet6_dev pointer from netdevice 269 * @dev: network device 270 * 271 * This version can be used in any context, and takes a reference 272 * on the inet6_dev. Callers must use in6_dev_put() later to 273 * release this reference. 274 */ 275 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev) 276 { 277 struct inet6_dev *idev; 278 279 rcu_read_lock(); 280 idev = rcu_dereference(dev->ip6_ptr); 281 if (idev) 282 atomic_inc(&idev->refcnt); 283 rcu_read_unlock(); 284 return idev; 285 } 286 287 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev) 288 { 289 struct inet6_dev *idev = __in6_dev_get(dev); 290 291 return idev ? idev->nd_parms : NULL; 292 } 293 294 void in6_dev_finish_destroy(struct inet6_dev *idev); 295 296 static inline void in6_dev_put(struct inet6_dev *idev) 297 { 298 if (atomic_dec_and_test(&idev->refcnt)) 299 in6_dev_finish_destroy(idev); 300 } 301 302 static inline void __in6_dev_put(struct inet6_dev *idev) 303 { 304 atomic_dec(&idev->refcnt); 305 } 306 307 static inline void in6_dev_hold(struct inet6_dev *idev) 308 { 309 atomic_inc(&idev->refcnt); 310 } 311 312 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp); 313 314 static inline void in6_ifa_put(struct inet6_ifaddr *ifp) 315 { 316 if (atomic_dec_and_test(&ifp->refcnt)) 317 inet6_ifa_finish_destroy(ifp); 318 } 319 320 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp) 321 { 322 atomic_dec(&ifp->refcnt); 323 } 324 325 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp) 326 { 327 atomic_inc(&ifp->refcnt); 328 } 329 330 331 /* 332 * compute link-local solicited-node multicast address 333 */ 334 335 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr, 336 struct in6_addr *solicited) 337 { 338 ipv6_addr_set(solicited, 339 htonl(0xFF020000), 0, 340 htonl(0x1), 341 htonl(0xFF000000) | addr->s6_addr32[3]); 342 } 343 344 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr) 345 { 346 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 347 __be64 *p = (__be64 *)addr; 348 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL; 349 #else 350 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 351 addr->s6_addr32[1] | addr->s6_addr32[2] | 352 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0; 353 #endif 354 } 355 356 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr) 357 { 358 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 359 __be64 *p = (__be64 *)addr; 360 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL; 361 #else 362 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 363 addr->s6_addr32[1] | addr->s6_addr32[2] | 364 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0; 365 #endif 366 } 367 368 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr) 369 { 370 return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE); 371 } 372 373 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr) 374 { 375 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 376 __be64 *p = (__be64 *)addr; 377 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | 378 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) & 379 cpu_to_be64(0xffffffffff000000UL))) == 0UL; 380 #else 381 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | 382 addr->s6_addr32[1] | 383 (addr->s6_addr32[2] ^ htonl(0x00000001)) | 384 (addr->s6_addr[12] ^ 0xff)) == 0; 385 #endif 386 } 387 388 #ifdef CONFIG_PROC_FS 389 int if6_proc_init(void); 390 void if6_proc_exit(void); 391 #endif 392 393 #endif 394