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 static inline u32 ndisc_hashfn(const void *pkey, const struct net_device *dev, __u32 *hash_rnd)
  83 {
  84         const u32 *p32 = pkey;
  85
  86         return (((p32[0] ^ dev->ifindex) * hash_rnd[0]) +
  87                 (p32[1] * hash_rnd[1]) +
  88                 (p32[2] * hash_rnd[2]) +
  89                 (p32[3] * hash_rnd[3]));
  90 }
  91
  92 static inline struct neighbour *__ipv6_neigh_lookup(struct neigh_table *tbl, struct net_device *dev, const void *pkey)
  93 {
  94         struct neigh_hash_table *nht;
  95         const u32 *p32 = pkey;
  96         struct neighbour *n;
  97         u32 hash_val;
  98
  99         rcu_read_lock_bh();
 100         nht = rcu_dereference_bh(tbl->nht);
 101         hash_val = ndisc_hashfn(pkey, dev, nht->hash_rnd) >> (32 - nht->hash_shift);
 102         for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]);
 103              n != NULL;
 104              n = rcu_dereference_bh(n->next)) {
 105                 u32 *n32 = (u32 *) n->primary_key;
 106                 if (n->dev == dev &&
 107                     ((n32[0] ^ p32[0]) | (n32[1] ^ p32[1]) |
 108                      (n32[2] ^ p32[2]) | (n32[3] ^ p32[3])) == 0) {
 109                         if (!atomic_inc_not_zero(&n->refcnt))
 110                                 n = NULL;
 111                         break;
 112                 }
 113         }
 114         rcu_read_unlock_bh();
 115
 116         return n;
 117 }
 118
 119 extern int                      ndisc_init(void);
 120
 121 extern void                     ndisc_cleanup(void);
 122
 123 extern int                      ndisc_rcv(struct sk_buff *skb);
 124
 125 extern void                     ndisc_send_ns(struct net_device *dev,
 126                                               struct neighbour *neigh,
 127                                               const struct in6_addr *solicit,
 128                                               const struct in6_addr *daddr,
 129                                               const struct in6_addr *saddr);
 130
 131 extern void                     ndisc_send_rs(struct net_device *dev,
 132                                               const struct in6_addr *saddr,
 133                                               const struct in6_addr *daddr);
 134
 135 extern void                     ndisc_send_redirect(struct sk_buff *skb,
 136                                                     struct neighbour *neigh,
 137                                                     const struct in6_addr *target);
 138
 139 extern int                      ndisc_mc_map(const struct in6_addr *addr, char *buf,
 140                                              struct net_device *dev, int dir);
 141
 142 extern struct sk_buff           *ndisc_build_skb(struct net_device *dev,
 143                                                  const struct in6_addr *daddr,
 144                                                  const struct in6_addr *saddr,
 145                                                  struct icmp6hdr *icmp6h,
 146                                                  const struct in6_addr *target,
 147                                                  int llinfo);
 148
 149 extern void                     ndisc_send_skb(struct sk_buff *skb,
 150                                                struct net_device *dev,
 151                                                struct neighbour *neigh,
 152                                                const struct in6_addr *daddr,
 153                                                const struct in6_addr *saddr,
 154                                                struct icmp6hdr *icmp6h);
 155
 156
 157
 158 /*
 159  *      IGMP
 160  */
 161 extern int                      igmp6_init(void);
 162
 163 extern void                     igmp6_cleanup(void);
 164
 165 extern int                      igmp6_event_query(struct sk_buff *skb);
 166
 167 extern int                      igmp6_event_report(struct sk_buff *skb);
 168
 169
 170 #ifdef CONFIG_SYSCTL
 171 extern int                      ndisc_ifinfo_sysctl_change(struct ctl_table *ctl,
 172                                                            int write,
 173                                                            void __user *buffer,
 174                                                            size_t *lenp,
 175                                                            loff_t *ppos);
 176 int ndisc_ifinfo_sysctl_strategy(ctl_table *ctl,
 177                                  void __user *oldval, size_t __user *oldlenp,
 178                                  void __user *newval, size_t newlen);
 179 #endif
 180
 181 extern void                     inet6_ifinfo_notify(int event,
 182                                                     struct inet6_dev *idev);
 183
 184 #endif