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