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