5 * ICMP codes for neighbour discovery messages
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
15 * Router type: cross-layer information from link-layer to
16 * IPv6 layer reported by certain link types (e.g., RFC4214).
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 */
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 */
35 ND_OPT_ROUTE_INFO = 24, /* RFC4191 */
36 ND_OPT_RDNSS = 25, /* RFC5006 */
37 ND_OPT_DNSSL = 31, /* RFC6106 */
41 #define MAX_RTR_SOLICITATION_DELAY HZ
43 #define ND_REACHABLE_TIME (30*HZ)
44 #define ND_RETRANS_TIMER HZ
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>
54 #include <net/neighbour.h>
59 struct net_proto_family;
62 extern struct neigh_table nd_tbl;
65 struct icmp6hdr icmph;
66 struct in6_addr target;
71 struct icmp6hdr icmph;
76 struct icmp6hdr icmph;
77 __be32 reachable_time;
87 struct ndisc_options {
88 struct nd_opt_hdr *nd_opt_array[__ND_OPT_ARRAY_MAX];
89 #ifdef CONFIG_IPV6_ROUTE_INFO
90 struct nd_opt_hdr *nd_opts_ri;
91 struct nd_opt_hdr *nd_opts_ri_end;
93 struct nd_opt_hdr *nd_useropts;
94 struct nd_opt_hdr *nd_useropts_end;
97 #define nd_opts_src_lladdr nd_opt_array[ND_OPT_SOURCE_LL_ADDR]
98 #define nd_opts_tgt_lladdr nd_opt_array[ND_OPT_TARGET_LL_ADDR]
99 #define nd_opts_pi nd_opt_array[ND_OPT_PREFIX_INFO]
100 #define nd_opts_pi_end nd_opt_array[__ND_OPT_PREFIX_INFO_END]
101 #define nd_opts_rh nd_opt_array[ND_OPT_REDIRECT_HDR]
102 #define nd_opts_mtu nd_opt_array[ND_OPT_MTU]
104 #define NDISC_OPT_SPACE(len) (((len)+2+7)&~7)
106 extern struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len,
107 struct ndisc_options *ndopts);
110 * Return the padding between the option length and the start of the
111 * link addr. Currently only IP-over-InfiniBand needs this, although
112 * if RFC 3831 IPv6-over-Fibre Channel is ever implemented it may
113 * also need a pad of 2.
115 static int ndisc_addr_option_pad(unsigned short type)
118 case ARPHRD_INFINIBAND: return 2;
123 static inline u8 *ndisc_opt_addr_data(struct nd_opt_hdr *p,
124 struct net_device *dev)
126 u8 *lladdr = (u8 *)(p + 1);
127 int lladdrlen = p->nd_opt_len << 3;
128 int prepad = ndisc_addr_option_pad(dev->type);
129 if (lladdrlen != NDISC_OPT_SPACE(dev->addr_len + prepad))
131 return lladdr + prepad;
134 static inline u32 ndisc_hashfn(const void *pkey, const struct net_device *dev, __u32 *hash_rnd)
136 const u32 *p32 = pkey;
138 return (((p32[0] ^ hash32_ptr(dev)) * hash_rnd[0]) +
139 (p32[1] * hash_rnd[1]) +
140 (p32[2] * hash_rnd[2]) +
141 (p32[3] * hash_rnd[3]));
144 static inline struct neighbour *__ipv6_neigh_lookup(struct neigh_table *tbl, struct net_device *dev, const void *pkey)
146 struct neigh_hash_table *nht;
147 const u32 *p32 = pkey;
152 nht = rcu_dereference_bh(tbl->nht);
153 hash_val = ndisc_hashfn(pkey, dev, nht->hash_rnd) >> (32 - nht->hash_shift);
154 for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]);
156 n = rcu_dereference_bh(n->next)) {
157 u32 *n32 = (u32 *) n->primary_key;
159 ((n32[0] ^ p32[0]) | (n32[1] ^ p32[1]) |
160 (n32[2] ^ p32[2]) | (n32[3] ^ p32[3])) == 0) {
161 if (!atomic_inc_not_zero(&n->refcnt))
166 rcu_read_unlock_bh();
171 extern int ndisc_init(void);
173 extern void ndisc_cleanup(void);
175 extern int ndisc_rcv(struct sk_buff *skb);
177 extern void ndisc_send_ns(struct net_device *dev,
178 struct neighbour *neigh,
179 const struct in6_addr *solicit,
180 const struct in6_addr *daddr,
181 const struct in6_addr *saddr);
183 extern void ndisc_send_rs(struct net_device *dev,
184 const struct in6_addr *saddr,
185 const struct in6_addr *daddr);
187 extern void ndisc_send_redirect(struct sk_buff *skb,
188 const struct in6_addr *target);
190 extern int ndisc_mc_map(const struct in6_addr *addr, char *buf,
191 struct net_device *dev, int dir);
193 extern struct sk_buff *ndisc_build_skb(struct net_device *dev,
194 const struct in6_addr *daddr,
195 const struct in6_addr *saddr,
196 struct icmp6hdr *icmp6h,
197 const struct in6_addr *target,
200 extern void ndisc_send_skb(struct sk_buff *skb,
201 struct net_device *dev,
202 struct neighbour *neigh,
203 const struct in6_addr *daddr,
204 const struct in6_addr *saddr,
205 struct icmp6hdr *icmp6h);
212 extern int igmp6_init(void);
214 extern void igmp6_cleanup(void);
216 extern int igmp6_event_query(struct sk_buff *skb);
218 extern int igmp6_event_report(struct sk_buff *skb);
222 extern int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl,
227 int ndisc_ifinfo_sysctl_strategy(ctl_table *ctl,
228 void __user *oldval, size_t __user *oldlenp,
229 void __user *newval, size_t newlen);
232 extern void inet6_ifinfo_notify(int event,
233 struct inet6_dev *idev);