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 25struct 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 56int addrconf_init(void); 57void addrconf_cleanup(void); 58 59int addrconf_add_ifaddr(struct net *net, void __user *arg); 60int addrconf_del_ifaddr(struct net *net, void __user *arg); 61int addrconf_set_dstaddr(struct net *net, void __user *arg); 62 63int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 64 const struct net_device *dev, int strict); 65int 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) 70int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr); 71#endif 72 73bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 74 const unsigned int prefix_len, 75 struct net_device *dev); 76 77int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev); 78 79struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, 80 const struct in6_addr *addr, 81 struct net_device *dev, int strict); 82 83int 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); 86int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 87 u32 banned_flags); 88int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 89 u32 banned_flags); 90int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2); 91void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr); 92void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr); 93 94static 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 111static inline int addrconf_finite_timeout(unsigned long timeout) 112{ 113 return ~timeout; 114} 115 116/* 117 * IPv6 Address Label subsystem (addrlabel.c) 118 */ 119int ipv6_addr_label_init(void); 120void ipv6_addr_label_cleanup(void); 121void ipv6_addr_label_rtnl_register(void); 122u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr, 123 int type, int ifindex); 124 125/* 126 * multicast prototypes (mcast.c) 127 */ 128int ipv6_sock_mc_join(struct sock *sk, int ifindex, 129 const struct in6_addr *addr); 130int ipv6_sock_mc_drop(struct sock *sk, int ifindex, 131 const struct in6_addr *addr); 132void ipv6_sock_mc_close(struct sock *sk); 133bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr, 134 const struct in6_addr *src_addr); 135 136int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr); 137int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr); 138int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr); 139void ipv6_mc_up(struct inet6_dev *idev); 140void ipv6_mc_down(struct inet6_dev *idev); 141void ipv6_mc_unmap(struct inet6_dev *idev); 142void ipv6_mc_remap(struct inet6_dev *idev); 143void ipv6_mc_init_dev(struct inet6_dev *idev); 144void ipv6_mc_destroy_dev(struct inet6_dev *idev); 145void addrconf_dad_failure(struct inet6_ifaddr *ifp); 146 147bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, 148 const struct in6_addr *src_addr); 149 150void 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 */ 155struct 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}; 169extern const struct ipv6_stub *ipv6_stub __read_mostly; 170 171/* 172 * identify MLD packets for MLD filter exceptions 173 */ 174static 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 196void addrconf_prefix_rcv(struct net_device *dev, 197 u8 *opt, int len, bool sllao); 198 199/* 200 * anycast prototypes (anycast.c) 201 */ 202int ipv6_sock_ac_join(struct sock *sk, int ifindex, 203 const struct in6_addr *addr); 204int ipv6_sock_ac_drop(struct sock *sk, int ifindex, 205 const struct in6_addr *addr); 206void ipv6_sock_ac_close(struct sock *sk); 207 208int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr); 209int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr); 210void ipv6_ac_destroy_dev(struct inet6_dev *idev); 211bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev, 212 const struct in6_addr *addr); 213bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev, 214 const struct in6_addr *addr); 215 216/* Device notifier */ 217int register_inet6addr_notifier(struct notifier_block *nb); 218int unregister_inet6addr_notifier(struct notifier_block *nb); 219int inet6addr_notifier_call_chain(unsigned long val, void *v); 220 221void 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 */ 231static 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 */ 244static 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 256static 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 263void in6_dev_finish_destroy(struct inet6_dev *idev); 264 265static 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 271static inline void __in6_dev_put(struct inet6_dev *idev) 272{ 273 atomic_dec(&idev->refcnt); 274} 275 276static inline void in6_dev_hold(struct inet6_dev *idev) 277{ 278 atomic_inc(&idev->refcnt); 279} 280 281void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp); 282 283static 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 289static inline void __in6_ifa_put(struct inet6_ifaddr *ifp) 290{ 291 atomic_dec(&ifp->refcnt); 292} 293 294static 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 304static 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 313static 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 325static 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 337static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr) 338{ 339 return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE); 340} 341 342static 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 358int if6_proc_init(void); 359void if6_proc_exit(void); 360#endif 361 362#endif 363