linux/include/net/ndisc.h
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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
  27enum {
  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_DNSSL = 31,              /* RFC6106 */
  38        __ND_OPT_MAX
  39};
  40
  41#define MAX_RTR_SOLICITATION_DELAY      HZ
  42
  43#define ND_REACHABLE_TIME               (30*HZ)
  44#define ND_RETRANS_TIMER                HZ
  45
  46#include <linux/compiler.h>
  47#include <linux/icmpv6.h>
  48#include <linux/in6.h>
  49#include <linux/types.h>
  50#include <linux/if_arp.h>
  51#include <linux/netdevice.h>
  52#include <linux/hash.h>
  53
  54#include <net/neighbour.h>
  55
  56struct ctl_table;
  57struct inet6_dev;
  58struct net_device;
  59struct net_proto_family;
  60struct sk_buff;
  61
  62extern struct neigh_table nd_tbl;
  63
  64struct nd_msg {
  65        struct icmp6hdr icmph;
  66        struct in6_addr target;
  67        __u8            opt[0];
  68};
  69
  70struct rs_msg {
  71        struct icmp6hdr icmph;
  72        __u8            opt[0];
  73};
  74
  75struct ra_msg {
  76        struct icmp6hdr         icmph;
  77        __be32                  reachable_time;
  78        __be32                  retrans_timer;
  79};
  80
  81struct rd_msg {
  82        struct icmp6hdr icmph;
  83        struct in6_addr target;
  84        struct in6_addr dest;
  85        __u8            opt[0];
  86};
  87
  88struct nd_opt_hdr {
  89        __u8            nd_opt_type;
  90        __u8            nd_opt_len;
  91} __packed;
  92
  93/* ND options */
  94struct ndisc_options {
  95        struct nd_opt_hdr *nd_opt_array[__ND_OPT_ARRAY_MAX];
  96#ifdef CONFIG_IPV6_ROUTE_INFO
  97        struct nd_opt_hdr *nd_opts_ri;
  98        struct nd_opt_hdr *nd_opts_ri_end;
  99#endif
 100        struct nd_opt_hdr *nd_useropts;
 101        struct nd_opt_hdr *nd_useropts_end;
 102};
 103
 104#define nd_opts_src_lladdr      nd_opt_array[ND_OPT_SOURCE_LL_ADDR]
 105#define nd_opts_tgt_lladdr      nd_opt_array[ND_OPT_TARGET_LL_ADDR]
 106#define nd_opts_pi              nd_opt_array[ND_OPT_PREFIX_INFO]
 107#define nd_opts_pi_end          nd_opt_array[__ND_OPT_PREFIX_INFO_END]
 108#define nd_opts_rh              nd_opt_array[ND_OPT_REDIRECT_HDR]
 109#define nd_opts_mtu             nd_opt_array[ND_OPT_MTU]
 110
 111#define NDISC_OPT_SPACE(len) (((len)+2+7)&~7)
 112
 113extern struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len,
 114                                                 struct ndisc_options *ndopts);
 115
 116/*
 117 * Return the padding between the option length and the start of the
 118 * link addr.  Currently only IP-over-InfiniBand needs this, although
 119 * if RFC 3831 IPv6-over-Fibre Channel is ever implemented it may
 120 * also need a pad of 2.
 121 */
 122static int ndisc_addr_option_pad(unsigned short type)
 123{
 124        switch (type) {
 125        case ARPHRD_INFINIBAND: return 2;
 126        default:                return 0;
 127        }
 128}
 129
 130static inline u8 *ndisc_opt_addr_data(struct nd_opt_hdr *p,
 131                                      struct net_device *dev)
 132{
 133        u8 *lladdr = (u8 *)(p + 1);
 134        int lladdrlen = p->nd_opt_len << 3;
 135        int prepad = ndisc_addr_option_pad(dev->type);
 136        if (lladdrlen != NDISC_OPT_SPACE(dev->addr_len + prepad))
 137                return NULL;
 138        return lladdr + prepad;
 139}
 140
 141static inline u32 ndisc_hashfn(const void *pkey, const struct net_device *dev, __u32 *hash_rnd)
 142{
 143        const u32 *p32 = pkey;
 144
 145        return (((p32[0] ^ hash32_ptr(dev)) * hash_rnd[0]) +
 146                (p32[1] * hash_rnd[1]) +
 147                (p32[2] * hash_rnd[2]) +
 148                (p32[3] * hash_rnd[3]));
 149}
 150
 151static inline struct neighbour *__ipv6_neigh_lookup(struct neigh_table *tbl, struct net_device *dev, const void *pkey)
 152{
 153        struct neigh_hash_table *nht;
 154        const u32 *p32 = pkey;
 155        struct neighbour *n;
 156        u32 hash_val;
 157
 158        rcu_read_lock_bh();
 159        nht = rcu_dereference_bh(tbl->nht);
 160        hash_val = ndisc_hashfn(pkey, dev, nht->hash_rnd) >> (32 - nht->hash_shift);
 161        for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]);
 162             n != NULL;
 163             n = rcu_dereference_bh(n->next)) {
 164                u32 *n32 = (u32 *) n->primary_key;
 165                if (n->dev == dev &&
 166                    ((n32[0] ^ p32[0]) | (n32[1] ^ p32[1]) |
 167                     (n32[2] ^ p32[2]) | (n32[3] ^ p32[3])) == 0) {
 168                        if (!atomic_inc_not_zero(&n->refcnt))
 169                                n = NULL;
 170                        break;
 171                }
 172        }
 173        rcu_read_unlock_bh();
 174
 175        return n;
 176}
 177
 178extern int                      ndisc_init(void);
 179
 180extern void                     ndisc_cleanup(void);
 181
 182extern int                      ndisc_rcv(struct sk_buff *skb);
 183
 184extern void                     ndisc_send_ns(struct net_device *dev,
 185                                              struct neighbour *neigh,
 186                                              const struct in6_addr *solicit,
 187                                              const struct in6_addr *daddr,
 188                                              const struct in6_addr *saddr);
 189
 190extern void                     ndisc_send_rs(struct net_device *dev,
 191                                              const struct in6_addr *saddr,
 192                                              const struct in6_addr *daddr);
 193
 194extern void                     ndisc_send_redirect(struct sk_buff *skb,
 195                                                    const struct in6_addr *target);
 196
 197extern int                      ndisc_mc_map(const struct in6_addr *addr, char *buf,
 198                                             struct net_device *dev, int dir);
 199
 200extern struct sk_buff           *ndisc_build_skb(struct net_device *dev,
 201                                                 const struct in6_addr *daddr,
 202                                                 const struct in6_addr *saddr,
 203                                                 struct icmp6hdr *icmp6h,
 204                                                 const struct in6_addr *target,
 205                                                 int llinfo);
 206
 207extern void                     ndisc_send_skb(struct sk_buff *skb,
 208                                               struct net_device *dev,
 209                                               struct neighbour *neigh,
 210                                               const struct in6_addr *daddr,
 211                                               const struct in6_addr *saddr,
 212                                               struct icmp6hdr *icmp6h);
 213
 214
 215
 216/*
 217 *      IGMP
 218 */
 219extern int                      igmp6_init(void);
 220
 221extern void                     igmp6_cleanup(void);
 222
 223extern int                      igmp6_event_query(struct sk_buff *skb);
 224
 225extern int                      igmp6_event_report(struct sk_buff *skb);
 226
 227
 228#ifdef CONFIG_SYSCTL
 229extern int                      ndisc_ifinfo_sysctl_change(struct ctl_table *ctl,
 230                                                           int write,
 231                                                           void __user *buffer,
 232                                                           size_t *lenp,
 233                                                           loff_t *ppos);
 234int ndisc_ifinfo_sysctl_strategy(ctl_table *ctl,
 235                                 void __user *oldval, size_t __user *oldlenp,
 236                                 void __user *newval, size_t newlen);
 237#endif
 238
 239extern void                     inet6_ifinfo_notify(int event,
 240                                                    struct inet6_dev *idev);
 241
 242#endif
 243
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