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   1 #ifndef _NDISC_H
   2 #define _NDISC_H
   3
   4 /*
   5  *      ICMP codes for neighbour discovery messages
   6  */
   7
   8 #define NDISC_ROUTER_SOLICITATION       133
   9 #define NDISC_ROUTER_ADVERTISEMENT      134
  10 #define NDISC_NEIGHBOUR_SOLICITATION    135
  11 #define NDISC_NEIGHBOUR_ADVERTISEMENT   136
  12 #define NDISC_REDIRECT                  137
  13
  14 /*
  15  * Router type: cross-layer information from link-layer to
  16  * IPv6 layer reported by certain link types (e.g., RFC4214).
  17  */
  18 #define NDISC_NODETYPE_UNSPEC           0       /* unspecified (default) */
  19 #define NDISC_NODETYPE_HOST             1       /* host or unauthorized router */
  20 #define NDISC_NODETYPE_NODEFAULT        2       /* non-default router */
  21 #define NDISC_NODETYPE_DEFAULT          3       /* default router */
  22
  23 /*
  24  *      ndisc options
  25  */
  26
  27 enum {
  28         __ND_OPT_PREFIX_INFO_END = 0,
  29         ND_OPT_SOURCE_LL_ADDR = 1,      /* RFC2461 */
  30         ND_OPT_TARGET_LL_ADDR = 2,      /* RFC2461 */
  31         ND_OPT_PREFIX_INFO = 3,         /* RFC2461 */
  32         ND_OPT_REDIRECT_HDR = 4,        /* RFC2461 */
  33         ND_OPT_MTU = 5,                 /* RFC2461 */
  34         __ND_OPT_ARRAY_MAX,
  35         ND_OPT_ROUTE_INFO = 24,         /* RFC4191 */
  36         ND_OPT_RDNSS = 25,              /* RFC5006 */
  37         __ND_OPT_MAX
  38 };
  39
  40 #define MAX_RTR_SOLICITATION_DELAY      HZ
  41
  42 #define ND_REACHABLE_TIME               (30*HZ)
  43 #define ND_RETRANS_TIMER                HZ
  44
  45 #define ND_MIN_RANDOM_FACTOR            (1/2)
  46 #define ND_MAX_RANDOM_FACTOR            (3/2)
  47
  48 #ifdef __KERNEL__
  49
  50 #include <linux/compiler.h>
  51 #include <linux/icmpv6.h>
  52 #include <linux/in6.h>
  53 #include <linux/types.h>
  54
  55 #include <net/neighbour.h>
  56
  57 struct ctl_table;
  58 struct file;
  59 struct inet6_dev;
  60 struct net_device;
  61 struct net_proto_family;
  62 struct sk_buff;
  63
  64 extern struct neigh_table nd_tbl;
  65
  66 struct nd_msg {
  67         struct icmp6hdr icmph;
  68         struct in6_addr target;
  69         __u8            opt[0];
  70 };
  71
  72 struct rs_msg {
  73         struct icmp6hdr icmph;
  74         __u8            opt[0];
  75 };
  76
  77 struct ra_msg {
  78         struct icmp6hdr         icmph;
  79         __be32                  reachable_time;
  80         __be32                  retrans_timer;
  81 };
  82
  83 struct nd_opt_hdr {
  84         __u8            nd_opt_type;
  85         __u8            nd_opt_len;
  86 } __attribute__((__packed__));
  87
  88
  89 extern int                      ndisc_init(void);
  90
  91 extern void                     ndisc_cleanup(void);
  92
  93 extern int                      ndisc_rcv(struct sk_buff *skb);
  94
  95 extern void                     ndisc_send_ns(struct net_device *dev,
  96                                               struct neighbour *neigh,
  97                                               const struct in6_addr *solicit,
  98                                               const struct in6_addr *daddr,
  99                                               const struct in6_addr *saddr);
 100
 101 extern void                     ndisc_send_rs(struct net_device *dev,
 102                                               const struct in6_addr *saddr,
 103                                               const struct in6_addr *daddr);
 104
 105 extern void                     ndisc_send_redirect(struct sk_buff *skb,
 106                                                     struct neighbour *neigh,
 107                                                     const struct in6_addr *target);
 108
 109 extern int                      ndisc_mc_map(struct in6_addr *addr, char *buf, struct net_device *dev, int dir);
 110
 111 extern struct sk_buff           *ndisc_build_skb(struct net_device *dev,
 112                                                  const struct in6_addr *daddr,
 113                                                  const struct in6_addr *saddr,
 114                                                  struct icmp6hdr *icmp6h,
 115                                                  const struct in6_addr *target,
 116                                                  int llinfo);
 117
 118 extern void                     ndisc_send_skb(struct sk_buff *skb,
 119                                                struct net_device *dev,
 120                                                struct neighbour *neigh,
 121                                                const struct in6_addr *daddr,
 122                                                const struct in6_addr *saddr,
 123                                                struct icmp6hdr *icmp6h);
 124
 125
 126
 127 /*
 128  *      IGMP
 129  */
 130 extern int                      igmp6_init(void);
 131
 132 extern void                     igmp6_cleanup(void);
 133
 134 extern int                      igmp6_event_query(struct sk_buff *skb);
 135
 136 extern int                      igmp6_event_report(struct sk_buff *skb);
 137
 138
 139 #ifdef CONFIG_SYSCTL
 140 extern int                      ndisc_ifinfo_sysctl_change(struct ctl_table *ctl,
 141                                                            int write,
 142                                                            struct file * filp,
 143                                                            void __user *buffer,
 144                                                            size_t *lenp,
 145                                                            loff_t *ppos);
 146 int ndisc_ifinfo_sysctl_strategy(ctl_table *ctl,
 147                                  void __user *oldval, size_t __user *oldlenp,
 148                                  void __user *newval, size_t newlen);
 149 #endif
 150
 151 extern void                     inet6_ifinfo_notify(int event,
 152                                                     struct inet6_dev *idev);
 153
 154 static inline struct neighbour * ndisc_get_neigh(struct net_device *dev, const struct in6_addr *addr)
 155 {
 156
 157         if (dev)
 158                 return __neigh_lookup_errno(&nd_tbl, addr, dev);
 159
 160         return ERR_PTR(-ENODEV);
 161 }
 162
 163
 164 #endif /* __KERNEL__ */
 165
 166
 167 #endif