linux/include/net/addrconf.h
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   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#include <linux/in.h>
  19#include <linux/in6.h>
  20
  21struct prefix_info {
  22        __u8                    type;
  23        __u8                    length;
  24        __u8                    prefix_len;
  25
  26#if defined(__BIG_ENDIAN_BITFIELD)
  27        __u8                    onlink : 1,
  28                                autoconf : 1,
  29                                reserved : 6;
  30#elif defined(__LITTLE_ENDIAN_BITFIELD)
  31        __u8                    reserved : 6,
  32                                autoconf : 1,
  33                                onlink : 1;
  34#else
  35#error "Please fix <asm/byteorder.h>"
  36#endif
  37        __be32                  valid;
  38        __be32                  prefered;
  39        __be32                  reserved2;
  40
  41        struct in6_addr         prefix;
  42};
  43
  44
  45#include <linux/netdevice.h>
  46#include <net/if_inet6.h>
  47#include <net/ipv6.h>
  48
  49#define IN6_ADDR_HSIZE_SHIFT    4
  50#define IN6_ADDR_HSIZE          (1 << IN6_ADDR_HSIZE_SHIFT)
  51
  52extern int                      addrconf_init(void);
  53extern void                     addrconf_cleanup(void);
  54
  55extern int                      addrconf_add_ifaddr(struct net *net,
  56                                                    void __user *arg);
  57extern int                      addrconf_del_ifaddr(struct net *net,
  58                                                    void __user *arg);
  59extern int                      addrconf_set_dstaddr(struct net *net,
  60                                                     void __user *arg);
  61
  62extern int                      ipv6_chk_addr(struct net *net,
  63                                              const struct in6_addr *addr,
  64                                              struct net_device *dev,
  65                                              int strict);
  66
  67#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
  68extern int                      ipv6_chk_home_addr(struct net *net,
  69                                                   const struct in6_addr *addr);
  70#endif
  71
  72extern int                      ipv6_chk_prefix(const struct in6_addr *addr,
  73                                                struct net_device *dev);
  74
  75extern struct inet6_ifaddr      *ipv6_get_ifaddr(struct net *net,
  76                                                 const struct in6_addr *addr,
  77                                                 struct net_device *dev,
  78                                                 int strict);
  79
  80extern int                      ipv6_dev_get_saddr(struct net *net,
  81                                               const struct net_device *dev,
  82                                               const struct in6_addr *daddr,
  83                                               unsigned int srcprefs,
  84                                               struct in6_addr *saddr);
  85extern int                      ipv6_get_lladdr(struct net_device *dev,
  86                                                struct in6_addr *addr,
  87                                                unsigned char banned_flags);
  88extern int                      ipv6_rcv_saddr_equal(const struct sock *sk,
  89                                                    const struct sock *sk2);
  90extern void                     addrconf_join_solict(struct net_device *dev,
  91                                        const struct in6_addr *addr);
  92extern void                     addrconf_leave_solict(struct inet6_dev *idev,
  93                                        const struct in6_addr *addr);
  94
  95static inline unsigned long addrconf_timeout_fixup(u32 timeout,
  96                                                   unsigned int unit)
  97{
  98        if (timeout == 0xffffffff)
  99                return ~0UL;
 100
 101        /*
 102         * Avoid arithmetic overflow.
 103         * Assuming unit is constant and non-zero, this "if" statement
 104         * will go away on 64bit archs.
 105         */
 106        if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
 107                return LONG_MAX / unit;
 108
 109        return timeout;
 110}
 111
 112static inline int addrconf_finite_timeout(unsigned long timeout)
 113{
 114        return ~timeout;
 115}
 116
 117/*
 118 *      IPv6 Address Label subsystem (addrlabel.c)
 119 */
 120extern int                      ipv6_addr_label_init(void);
 121extern void                     ipv6_addr_label_cleanup(void);
 122extern void                     ipv6_addr_label_rtnl_register(void);
 123extern u32                      ipv6_addr_label(struct net *net,
 124                                                const struct in6_addr *addr,
 125                                                int type, int ifindex);
 126
 127/*
 128 *      multicast prototypes (mcast.c)
 129 */
 130extern int ipv6_sock_mc_join(struct sock *sk, int ifindex,
 131                             const struct in6_addr *addr);
 132extern int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
 133                             const struct in6_addr *addr);
 134extern void ipv6_sock_mc_close(struct sock *sk);
 135extern bool inet6_mc_check(struct sock *sk,
 136                           const struct in6_addr *mc_addr,
 137                           const struct in6_addr *src_addr);
 138
 139extern int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
 140extern int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
 141extern int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
 142extern void ipv6_mc_up(struct inet6_dev *idev);
 143extern void ipv6_mc_down(struct inet6_dev *idev);
 144extern void ipv6_mc_unmap(struct inet6_dev *idev);
 145extern void ipv6_mc_remap(struct inet6_dev *idev);
 146extern void ipv6_mc_init_dev(struct inet6_dev *idev);
 147extern void ipv6_mc_destroy_dev(struct inet6_dev *idev);
 148extern void addrconf_dad_failure(struct inet6_ifaddr *ifp);
 149
 150extern bool ipv6_chk_mcast_addr(struct net_device *dev,
 151                                const struct in6_addr *group,
 152                                const struct in6_addr *src_addr);
 153extern bool ipv6_is_mld(struct sk_buff *skb, int nexthdr);
 154
 155extern void addrconf_prefix_rcv(struct net_device *dev,
 156                                u8 *opt, int len, bool sllao);
 157
 158/*
 159 *      anycast prototypes (anycast.c)
 160 */
 161extern int ipv6_sock_ac_join(struct sock *sk,int ifindex, const struct in6_addr *addr);
 162extern int ipv6_sock_ac_drop(struct sock *sk,int ifindex, const struct in6_addr *addr);
 163extern void ipv6_sock_ac_close(struct sock *sk);
 164
 165extern int ipv6_dev_ac_inc(struct net_device *dev, const struct in6_addr *addr);
 166extern int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
 167extern bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
 168                                const struct in6_addr *addr);
 169
 170
 171/* Device notifier */
 172extern int register_inet6addr_notifier(struct notifier_block *nb);
 173extern int unregister_inet6addr_notifier(struct notifier_block *nb);
 174
 175/**
 176 * __in6_dev_get - get inet6_dev pointer from netdevice
 177 * @dev: network device
 178 *
 179 * Caller must hold rcu_read_lock or RTNL, because this function
 180 * does not take a reference on the inet6_dev.
 181 */
 182static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
 183{
 184        return rcu_dereference_rtnl(dev->ip6_ptr);
 185}
 186
 187/**
 188 * in6_dev_get - get inet6_dev pointer from netdevice
 189 * @dev: network device
 190 *
 191 * This version can be used in any context, and takes a reference
 192 * on the inet6_dev. Callers must use in6_dev_put() later to
 193 * release this reference.
 194 */
 195static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
 196{
 197        struct inet6_dev *idev;
 198
 199        rcu_read_lock();
 200        idev = rcu_dereference(dev->ip6_ptr);
 201        if (idev)
 202                atomic_inc(&idev->refcnt);
 203        rcu_read_unlock();
 204        return idev;
 205}
 206
 207extern void in6_dev_finish_destroy(struct inet6_dev *idev);
 208
 209static inline void in6_dev_put(struct inet6_dev *idev)
 210{
 211        if (atomic_dec_and_test(&idev->refcnt))
 212                in6_dev_finish_destroy(idev);
 213}
 214
 215static inline void __in6_dev_put(struct inet6_dev *idev)
 216{
 217        atomic_dec(&idev->refcnt);
 218}
 219
 220static inline void in6_dev_hold(struct inet6_dev *idev)
 221{
 222        atomic_inc(&idev->refcnt);
 223}
 224
 225extern void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
 226
 227static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
 228{
 229        if (atomic_dec_and_test(&ifp->refcnt))
 230                inet6_ifa_finish_destroy(ifp);
 231}
 232
 233static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
 234{
 235        atomic_dec(&ifp->refcnt);
 236}
 237
 238static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
 239{
 240        atomic_inc(&ifp->refcnt);
 241}
 242
 243
 244/*
 245 *      compute link-local solicited-node multicast address
 246 */
 247
 248static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
 249                                             struct in6_addr *solicited)
 250{
 251        ipv6_addr_set(solicited,
 252                      htonl(0xFF020000), 0,
 253                      htonl(0x1),
 254                      htonl(0xFF000000) | addr->s6_addr32[3]);
 255}
 256
 257static inline int ipv6_addr_is_multicast(const struct in6_addr *addr)
 258{
 259        return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
 260}
 261
 262static inline int ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
 263{
 264        return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 265                addr->s6_addr32[1] | addr->s6_addr32[2] |
 266                (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
 267}
 268
 269static inline int ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
 270{
 271        return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 272                addr->s6_addr32[1] | addr->s6_addr32[2] |
 273                (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
 274}
 275
 276static inline int ipv6_addr_is_isatap(const struct in6_addr *addr)
 277{
 278        return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
 279}
 280
 281#ifdef CONFIG_PROC_FS
 282extern int if6_proc_init(void);
 283extern void if6_proc_exit(void);
 284#endif
 285
 286#endif
 287
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