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_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
  55 struct ctl_table;
  56 struct inet6_dev;
  57 struct net_device;
  58 struct net_proto_family;
  59 struct sk_buff;
  60
  61 extern struct neigh_table nd_tbl;
  62
  63 struct nd_msg {
  64         struct icmp6hdr icmph;
  65         struct in6_addr target;
  66         __u8            opt[0];
  67 };
  68
  69 struct rs_msg {
  70         struct icmp6hdr icmph;
  71         __u8            opt[0];
  72 };
  73
  74 struct ra_msg {
  75         struct icmp6hdr         icmph;
  76         __be32                  reachable_time;
  77         __be32                  retrans_timer;
  78 };
  79
  80 struct nd_opt_hdr {
  81         __u8            nd_opt_type;
  82         __u8            nd_opt_len;
  83 } __packed;
  84
  85 /* ND options */
  86 struct 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
 105 extern 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  */
 114 static 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
 122 static 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
 133 static 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
 143 static 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
 170 extern int                      ndisc_init(void);
 171
 172 extern void                     ndisc_cleanup(void);
 173
 174 extern int                      ndisc_rcv(struct sk_buff *skb);
 175
 176 extern 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
 182 extern void                     ndisc_send_rs(struct net_device *dev,
 183                                               const struct in6_addr *saddr,
 184                                               const struct in6_addr *daddr);
 185
 186 extern void                     ndisc_send_redirect(struct sk_buff *skb,
 187                                                     const struct in6_addr *target);
 188
 189 extern int                      ndisc_mc_map(const struct in6_addr *addr, char *buf,
 190                                              struct net_device *dev, int dir);
 191
 192 extern 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
 199 extern 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  */
 211 extern int                      igmp6_init(void);
 212
 213 extern void                     igmp6_cleanup(void);
 214
 215 extern int                      igmp6_event_query(struct sk_buff *skb);
 216
 217 extern int                      igmp6_event_report(struct sk_buff *skb);
 218
 219
 220 #ifdef CONFIG_SYSCTL
 221 extern int                      ndisc_ifinfo_sysctl_change(struct ctl_table *ctl,
 222                                                            int write,
 223                                                            void __user *buffer,
 224                                                            size_t *lenp,
 225                                                            loff_t *ppos);
 226 int 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
 231 extern void                     inet6_ifinfo_notify(int event,
 232                                                     struct inet6_dev *idev);
 233
 234 #endif