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 #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 inet6_dev;
  59 struct net_device;
  60 struct net_proto_family;
  61 struct sk_buff;
  62
  63 extern struct neigh_table nd_tbl;
  64
  65 struct nd_msg {
  66         struct icmp6hdr icmph;
  67         struct in6_addr target;
  68         __u8            opt[0];
  69 };
  70
  71 struct rs_msg {
  72         struct icmp6hdr icmph;
  73         __u8            opt[0];
  74 };
  75
  76 struct ra_msg {
  77         struct icmp6hdr         icmph;
  78         __be32                  reachable_time;
  79         __be32                  retrans_timer;
  80 };
  81
  82 struct nd_opt_hdr {
  83         __u8            nd_opt_type;
  84         __u8            nd_opt_len;
  85 } __attribute__((__packed__));
  86
  87
  88 extern int                      ndisc_init(void);
  89
  90 extern void                     ndisc_cleanup(void);
  91
  92 extern int                      ndisc_rcv(struct sk_buff *skb);
  93
  94 extern void                     ndisc_send_ns(struct net_device *dev,
  95                                               struct neighbour *neigh,
  96                                               const struct in6_addr *solicit,
  97                                               const struct in6_addr *daddr,
  98                                               const struct in6_addr *saddr);
  99
 100 extern void                     ndisc_send_rs(struct net_device *dev,
 101                                               const struct in6_addr *saddr,
 102                                               const struct in6_addr *daddr);
 103
 104 extern void                     ndisc_send_redirect(struct sk_buff *skb,
 105                                                     struct neighbour *neigh,
 106                                                     const struct in6_addr *target);
 107
 108 extern int                      ndisc_mc_map(struct in6_addr *addr, char *buf, struct net_device *dev, int dir);
 109
 110 extern struct sk_buff           *ndisc_build_skb(struct net_device *dev,
 111                                                  const struct in6_addr *daddr,
 112                                                  const struct in6_addr *saddr,
 113                                                  struct icmp6hdr *icmp6h,
 114                                                  const struct in6_addr *target,
 115                                                  int llinfo);
 116
 117 extern void                     ndisc_send_skb(struct sk_buff *skb,
 118                                                struct net_device *dev,
 119                                                struct neighbour *neigh,
 120                                                const struct in6_addr *daddr,
 121                                                const struct in6_addr *saddr,
 122                                                struct icmp6hdr *icmp6h);
 123
 124
 125
 126 /*
 127  *      IGMP
 128  */
 129 extern int                      igmp6_init(void);
 130
 131 extern void                     igmp6_cleanup(void);
 132
 133 extern int                      igmp6_event_query(struct sk_buff *skb);
 134
 135 extern int                      igmp6_event_report(struct sk_buff *skb);
 136
 137
 138 #ifdef CONFIG_SYSCTL
 139 extern int                      ndisc_ifinfo_sysctl_change(struct ctl_table *ctl,
 140                                                            int write,
 141                                                            void __user *buffer,
 142                                                            size_t *lenp,
 143                                                            loff_t *ppos);
 144 int ndisc_ifinfo_sysctl_strategy(ctl_table *ctl,
 145                                  void __user *oldval, size_t __user *oldlenp,
 146                                  void __user *newval, size_t newlen);
 147 #endif
 148
 149 extern void                     inet6_ifinfo_notify(int event,
 150                                                     struct inet6_dev *idev);
 151
 152 static inline struct neighbour * ndisc_get_neigh(struct net_device *dev, const struct in6_addr *addr)
 153 {
 154
 155         if (dev)
 156                 return __neigh_lookup_errno(&nd_tbl, addr, dev);
 157
 158         return ERR_PTR(-ENODEV);
 159 }
 160
 161
 162 #endif /* __KERNEL__ */
 163
 164
 165 #endif