include/net/ndisc.h

   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 #ifdef __KERNEL__
  46
  47 #include <linux/compiler.h>
  48 #include <linux/icmpv6.h>
  49 #include <linux/in6.h>
  50 #include <linux/types.h>
  51
  52 #include <net/neighbour.h>
  53
  54 struct ctl_table;
  55 struct inet6_dev;
  56 struct net_device;
  57 struct net_proto_family;
  58 struct sk_buff;
  59
  60 extern struct neigh_table nd_tbl;
  61
  62 struct nd_msg {
  63         struct icmp6hdr icmph;
  64         struct in6_addr target;
  65         __u8            opt[0];
  66 };
  67
  68 struct rs_msg {
  69         struct icmp6hdr icmph;
  70         __u8            opt[0];
  71 };
  72
  73 struct ra_msg {
  74         struct icmp6hdr         icmph;
  75         __be32                  reachable_time;
  76         __be32                  retrans_timer;
  77 };
  78
  79 struct nd_opt_hdr {
  80         __u8            nd_opt_type;
  81         __u8            nd_opt_len;
  82 } __packed;
  83
  84
  85 extern int                      ndisc_init(void);
  86
  87 extern void                     ndisc_cleanup(void);
  88
  89 extern int                      ndisc_rcv(struct sk_buff *skb);
  90
  91 extern void                     ndisc_send_ns(struct net_device *dev,
  92                                               struct neighbour *neigh,
  93                                               const struct in6_addr *solicit,
  94                                               const struct in6_addr *daddr,
  95                                               const struct in6_addr *saddr);
  96
  97 extern void                     ndisc_send_rs(struct net_device *dev,
  98                                               const struct in6_addr *saddr,
  99                                               const struct in6_addr *daddr);
 100
 101 extern void                     ndisc_send_redirect(struct sk_buff *skb,
 102                                                     struct neighbour *neigh,
 103                                                     const struct in6_addr *target);
 104
 105 extern int                      ndisc_mc_map(struct in6_addr *addr, char *buf, struct net_device *dev, int dir);
 106
 107 extern struct sk_buff           *ndisc_build_skb(struct net_device *dev,
 108                                                  const struct in6_addr *daddr,
 109                                                  const struct in6_addr *saddr,
 110                                                  struct icmp6hdr *icmp6h,
 111                                                  const struct in6_addr *target,
 112                                                  int llinfo);
 113
 114 extern void                     ndisc_send_skb(struct sk_buff *skb,
 115                                                struct net_device *dev,
 116                                                struct neighbour *neigh,
 117                                                const struct in6_addr *daddr,
 118                                                const struct in6_addr *saddr,
 119                                                struct icmp6hdr *icmp6h);
 120
 121
 122
 123 /*
 124  *      IGMP
 125  */
 126 extern int                      igmp6_init(void);
 127
 128 extern void                     igmp6_cleanup(void);
 129
 130 extern int                      igmp6_event_query(struct sk_buff *skb);
 131
 132 extern int                      igmp6_event_report(struct sk_buff *skb);
 133
 134
 135 #ifdef CONFIG_SYSCTL
 136 extern int                      ndisc_ifinfo_sysctl_change(struct ctl_table *ctl,
 137                                                            int write,
 138                                                            void __user *buffer,
 139                                                            size_t *lenp,
 140                                                            loff_t *ppos);
 141 int ndisc_ifinfo_sysctl_strategy(ctl_table *ctl,
 142                                  void __user *oldval, size_t __user *oldlenp,
 143                                  void __user *newval, size_t newlen);
 144 #endif
 145
 146 extern void                     inet6_ifinfo_notify(int event,
 147                                                     struct inet6_dev *idev);
 148
 149 static inline struct neighbour * ndisc_get_neigh(struct net_device *dev, const struct in6_addr *addr)
 150 {
 151
 152         if (dev)
 153                 return __neigh_lookup_errno(&nd_tbl, addr, dev);
 154
 155         return ERR_PTR(-ENODEV);
 156 }
 157
 158
 159 #endif /* __KERNEL__ */
 160
 161
 162 #endif