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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 
 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 #include <linux/hash.h>
 53 
 54 #include <net/neighbour.h>
 55 
 56 struct ctl_table;
 57 struct inet6_dev;
 58 struct net_device;
 59 struct net_proto_family;
 60 struct sk_buff;
 61 
 62 extern struct neigh_table nd_tbl;
 63 
 64 struct nd_msg {
 65         struct icmp6hdr icmph;
 66         struct in6_addr target;
 67         __u8            opt[0];
 68 };
 69 
 70 struct rs_msg {
 71         struct icmp6hdr icmph;
 72         __u8            opt[0];
 73 };
 74 
 75 struct ra_msg {
 76         struct icmp6hdr         icmph;
 77         __be32                  reachable_time;
 78         __be32                  retrans_timer;
 79 };
 80 
 81 struct rd_msg {
 82         struct icmp6hdr icmph;
 83         struct in6_addr target;
 84         struct in6_addr dest;
 85         __u8            opt[0];
 86 };
 87 
 88 struct nd_opt_hdr {
 89         __u8            nd_opt_type;
 90         __u8            nd_opt_len;
 91 } __packed;
 92 
 93 /* ND options */
 94 struct 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 
113 extern 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  */
122 static inline 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 
130 static inline int ndisc_opt_addr_space(struct net_device *dev)
131 {
132         return NDISC_OPT_SPACE(dev->addr_len +
133                                ndisc_addr_option_pad(dev->type));
134 }
135 
136 static inline u8 *ndisc_opt_addr_data(struct nd_opt_hdr *p,
137                                       struct net_device *dev)
138 {
139         u8 *lladdr = (u8 *)(p + 1);
140         int lladdrlen = p->nd_opt_len << 3;
141         int prepad = ndisc_addr_option_pad(dev->type);
142         if (lladdrlen != ndisc_opt_addr_space(dev))
143                 return NULL;
144         return lladdr + prepad;
145 }
146 
147 static inline u32 ndisc_hashfn(const void *pkey, const struct net_device *dev, __u32 *hash_rnd)
148 {
149         const u32 *p32 = pkey;
150 
151         return (((p32[0] ^ hash32_ptr(dev)) * hash_rnd[0]) +
152                 (p32[1] * hash_rnd[1]) +
153                 (p32[2] * hash_rnd[2]) +
154                 (p32[3] * hash_rnd[3]));
155 }
156 
157 static inline struct neighbour *__ipv6_neigh_lookup_noref(struct net_device *dev, const void *pkey)
158 {
159         struct neigh_hash_table *nht;
160         const u32 *p32 = pkey;
161         struct neighbour *n;
162         u32 hash_val;
163 
164         nht = rcu_dereference_bh(nd_tbl.nht);
165         hash_val = ndisc_hashfn(pkey, dev, nht->hash_rnd) >> (32 - nht->hash_shift);
166         for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]);
167              n != NULL;
168              n = rcu_dereference_bh(n->next)) {
169                 u32 *n32 = (u32 *) n->primary_key;
170                 if (n->dev == dev &&
171                     ((n32[0] ^ p32[0]) | (n32[1] ^ p32[1]) |
172                      (n32[2] ^ p32[2]) | (n32[3] ^ p32[3])) == 0)
173                         return n;
174         }
175 
176         return NULL;
177 }
178 
179 static inline struct neighbour *__ipv6_neigh_lookup(struct net_device *dev, const void *pkey)
180 {
181         struct neighbour *n;
182 
183         rcu_read_lock_bh();
184         n = __ipv6_neigh_lookup_noref(dev, pkey);
185         if (n && !atomic_inc_not_zero(&n->refcnt))
186                 n = NULL;
187         rcu_read_unlock_bh();
188 
189         return n;
190 }
191 
192 extern int                      ndisc_init(void);
193 extern int                      ndisc_late_init(void);
194 
195 extern void                     ndisc_late_cleanup(void);
196 extern void                     ndisc_cleanup(void);
197 
198 extern int                      ndisc_rcv(struct sk_buff *skb);
199 
200 extern void                     ndisc_send_ns(struct net_device *dev,
201                                               struct neighbour *neigh,
202                                               const struct in6_addr *solicit,
203                                               const struct in6_addr *daddr,
204                                               const struct in6_addr *saddr);
205 
206 extern void                     ndisc_send_rs(struct net_device *dev,
207                                               const struct in6_addr *saddr,
208                                               const struct in6_addr *daddr);
209 extern void                     ndisc_send_na(struct net_device *dev, struct neighbour *neigh,
210                                               const struct in6_addr *daddr,
211                                               const struct in6_addr *solicited_addr,
212                                               bool router, bool solicited, bool override,
213                                               bool inc_opt);
214 
215 extern void                     ndisc_send_redirect(struct sk_buff *skb,
216                                                     const struct in6_addr *target);
217 
218 extern int                      ndisc_mc_map(const struct in6_addr *addr, char *buf,
219                                              struct net_device *dev, int dir);
220 
221 
222 /*
223  *      IGMP
224  */
225 extern int                      igmp6_init(void);
226 
227 extern void                     igmp6_cleanup(void);
228 
229 extern int                      igmp6_event_query(struct sk_buff *skb);
230 
231 extern int                      igmp6_event_report(struct sk_buff *skb);
232 
233 
234 #ifdef CONFIG_SYSCTL
235 extern int                      ndisc_ifinfo_sysctl_change(struct ctl_table *ctl,
236                                                            int write,
237                                                            void __user *buffer,
238                                                            size_t *lenp,
239                                                            loff_t *ppos);
240 int ndisc_ifinfo_sysctl_strategy(struct ctl_table *ctl,
241                                  void __user *oldval, size_t __user *oldlenp,
242                                  void __user *newval, size_t newlen);
243 #endif
244 
245 extern void                     inet6_ifinfo_notify(int event,
246                                                     struct inet6_dev *idev);
247 
248 #endif
249 

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