LXR linux/include/net/addrconf.h

   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          16
  50
  51extern int                      addrconf_init(void);
  52extern void                     addrconf_cleanup(void);
  53
  54extern int                      addrconf_add_ifaddr(struct net *net,
  55                                                    void __user *arg);
  56extern int                      addrconf_del_ifaddr(struct net *net,
  57                                                    void __user *arg);
  58extern int                      addrconf_set_dstaddr(struct net *net,
  59                                                     void __user *arg);
  60
  61extern int                      ipv6_chk_addr(struct net *net,
  62                                              const struct in6_addr *addr,
  63                                              struct net_device *dev,
  64                                              int strict);
  65
  66#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
  67extern int                      ipv6_chk_home_addr(struct net *net,
  68                                                   const struct in6_addr *addr);
  69#endif
  70
  71extern int                      ipv6_chk_prefix(const struct in6_addr *addr,
  72                                                struct net_device *dev);
  73
  74extern struct inet6_ifaddr      *ipv6_get_ifaddr(struct net *net,
  75                                                 const struct in6_addr *addr,
  76                                                 struct net_device *dev,
  77                                                 int strict);
  78
  79extern int                      ipv6_dev_get_saddr(struct net *net,
  80                                               struct net_device *dev,
  81                                               const struct in6_addr *daddr,
  82                                               unsigned int srcprefs,
  83                                               struct in6_addr *saddr);
  84extern int                      ipv6_get_lladdr(struct net_device *dev,
  85                                                struct in6_addr *addr,
  86                                                unsigned char banned_flags);
  87extern int                      ipv6_rcv_saddr_equal(const struct sock *sk,
  88                                                    const struct sock *sk2);
  89extern void                     addrconf_join_solict(struct net_device *dev,
  90                                        const struct in6_addr *addr);
  91extern void                     addrconf_leave_solict(struct inet6_dev *idev,
  92                                        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 */
 119extern int                      ipv6_addr_label_init(void);
 120extern void                     ipv6_addr_label_cleanup(void);
 121extern void                     ipv6_addr_label_rtnl_register(void);
 122extern u32                      ipv6_addr_label(struct net *net,
 123                                                const struct in6_addr *addr,
 124                                                int type, int ifindex);
 125
 126/*
 127 *      multicast prototypes (mcast.c)
 128 */
 129extern int ipv6_sock_mc_join(struct sock *sk, int ifindex,
 130                             const struct in6_addr *addr);
 131extern int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
 132                             const struct in6_addr *addr);
 133extern void ipv6_sock_mc_close(struct sock *sk);
 134extern bool inet6_mc_check(struct sock *sk,
 135                           const struct in6_addr *mc_addr,
 136                           const struct in6_addr *src_addr);
 137
 138extern int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
 139extern int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
 140extern int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
 141extern void ipv6_mc_up(struct inet6_dev *idev);
 142extern void ipv6_mc_down(struct inet6_dev *idev);
 143extern void ipv6_mc_unmap(struct inet6_dev *idev);
 144extern void ipv6_mc_remap(struct inet6_dev *idev);
 145extern void ipv6_mc_init_dev(struct inet6_dev *idev);
 146extern void ipv6_mc_destroy_dev(struct inet6_dev *idev);
 147extern void addrconf_dad_failure(struct inet6_ifaddr *ifp);
 148
 149extern bool ipv6_chk_mcast_addr(struct net_device *dev,
 150                                const struct in6_addr *group,
 151                                const struct in6_addr *src_addr);
 152extern bool ipv6_is_mld(struct sk_buff *skb, int nexthdr);
 153
 154extern void addrconf_prefix_rcv(struct net_device *dev,
 155                                u8 *opt, int len, bool sllao);
 156
 157/*
 158 *      anycast prototypes (anycast.c)
 159 */
 160extern int ipv6_sock_ac_join(struct sock *sk,int ifindex, const struct in6_addr *addr);
 161extern int ipv6_sock_ac_drop(struct sock *sk,int ifindex, const struct in6_addr *addr);
 162extern void ipv6_sock_ac_close(struct sock *sk);
 163
 164extern int ipv6_dev_ac_inc(struct net_device *dev, const struct in6_addr *addr);
 165extern int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
 166extern bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
 167                                const struct in6_addr *addr);
 168
 169
 170/* Device notifier */
 171extern int register_inet6addr_notifier(struct notifier_block *nb);
 172extern int unregister_inet6addr_notifier(struct notifier_block *nb);
 173
 174/**
 175 * __in6_dev_get - get inet6_dev pointer from netdevice
 176 * @dev: network device
 177 *
 178 * Caller must hold rcu_read_lock or RTNL, because this function
 179 * does not take a reference on the inet6_dev.
 180 */
 181static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
 182{
 183        return rcu_dereference_rtnl(dev->ip6_ptr);
 184}
 185
 186/**
 187 * in6_dev_get - get inet6_dev pointer from netdevice
 188 * @dev: network device
 189 *
 190 * This version can be used in any context, and takes a reference
 191 * on the inet6_dev. Callers must use in6_dev_put() later to
 192 * release this reference.
 193 */
 194static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
 195{
 196        struct inet6_dev *idev;
 197
 198        rcu_read_lock();
 199        idev = rcu_dereference(dev->ip6_ptr);
 200        if (idev)
 201                atomic_inc(&idev->refcnt);
 202        rcu_read_unlock();
 203        return idev;
 204}
 205
 206extern void in6_dev_finish_destroy(struct inet6_dev *idev);
 207
 208static inline void in6_dev_put(struct inet6_dev *idev)
 209{
 210        if (atomic_dec_and_test(&idev->refcnt))
 211                in6_dev_finish_destroy(idev);
 212}
 213
 214static inline void __in6_dev_put(struct inet6_dev *idev)
 215{
 216        atomic_dec(&idev->refcnt);
 217}
 218
 219static inline void in6_dev_hold(struct inet6_dev *idev)
 220{
 221        atomic_inc(&idev->refcnt);
 222}
 223
 224extern void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
 225
 226static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
 227{
 228        if (atomic_dec_and_test(&ifp->refcnt))
 229                inet6_ifa_finish_destroy(ifp);
 230}
 231
 232static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
 233{
 234        atomic_dec(&ifp->refcnt);
 235}
 236
 237static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
 238{
 239        atomic_inc(&ifp->refcnt);
 240}
 241
 242
 243/*
 244 *      compute link-local solicited-node multicast address
 245 */
 246
 247static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
 248                                             struct in6_addr *solicited)
 249{
 250        ipv6_addr_set(solicited,
 251                      htonl(0xFF020000), 0,
 252                      htonl(0x1),
 253                      htonl(0xFF000000) | addr->s6_addr32[3]);
 254}
 255
 256static inline int ipv6_addr_is_multicast(const struct in6_addr *addr)
 257{
 258        return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
 259}
 260
 261static inline int ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
 262{
 263        return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 264                addr->s6_addr32[1] | addr->s6_addr32[2] |
 265                (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
 266}
 267
 268static inline int ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
 269{
 270        return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 271                addr->s6_addr32[1] | addr->s6_addr32[2] |
 272                (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
 273}
 274
 275static inline int ipv6_addr_is_isatap(const struct in6_addr *addr)
 276{
 277        return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
 278}
 279
 280#ifdef CONFIG_PROC_FS
 281extern int if6_proc_init(void);
 282extern void if6_proc_exit(void);
 283#endif
 284
 285#endif
 286