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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#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/*
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -040015 * 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/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070024 * 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 */
YOSHIFUJI Hideaki70ceb4f2006-03-20 17:06:24 -080034 __ND_OPT_ARRAY_MAX,
35 ND_OPT_ROUTE_INFO = 24, /* RFC4191 */
Pierre Ynard31910572007-10-10 21:22:05 -070036 ND_OPT_RDNSS = 25, /* RFC5006 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070037 __ND_OPT_MAX
38};
39
40#define MAX_RTR_SOLICITATION_DELAY HZ
41
42#define ND_REACHABLE_TIME (30*HZ)
43#define ND_RETRANS_TIMER HZ
44
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020045#include <linux/compiler.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070046#include <linux/icmpv6.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020047#include <linux/in6.h>
48#include <linux/types.h>
49
Linus Torvalds1da177e2005-04-16 15:20:36 -070050#include <net/neighbour.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020051
52struct ctl_table;
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020053struct inet6_dev;
54struct net_device;
55struct net_proto_family;
56struct sk_buff;
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
58extern struct neigh_table nd_tbl;
59
60struct nd_msg {
61 struct icmp6hdr icmph;
62 struct in6_addr target;
63 __u8 opt[0];
64};
65
66struct rs_msg {
67 struct icmp6hdr icmph;
68 __u8 opt[0];
69};
70
71struct ra_msg {
72 struct icmp6hdr icmph;
Al Viroe69a4ad2006-11-14 20:56:00 -080073 __be32 reachable_time;
74 __be32 retrans_timer;
Linus Torvalds1da177e2005-04-16 15:20:36 -070075};
76
77struct nd_opt_hdr {
78 __u8 nd_opt_type;
79 __u8 nd_opt_len;
Eric Dumazetbc105022010-06-03 03:21:52 -070080} __packed;
Linus Torvalds1da177e2005-04-16 15:20:36 -070081
David S. Miller2c2aba62011-12-28 15:06:58 -050082static inline u32 ndisc_hashfn(const void *pkey, const struct net_device *dev, __u32 *hash_rnd)
83{
84 const u32 *p32 = pkey;
85
86 return (((p32[0] ^ dev->ifindex) * hash_rnd[0]) +
87 (p32[1] * hash_rnd[1]) +
88 (p32[2] * hash_rnd[2]) +
89 (p32[3] * hash_rnd[3]));
90}
Linus Torvalds1da177e2005-04-16 15:20:36 -070091
David S. Millerf83c7792011-12-28 15:41:23 -050092static inline struct neighbour *__ipv6_neigh_lookup(struct neigh_table *tbl, struct net_device *dev, const void *pkey)
93{
94 struct neigh_hash_table *nht;
95 const u32 *p32 = pkey;
96 struct neighbour *n;
97 u32 hash_val;
98
99 rcu_read_lock_bh();
100 nht = rcu_dereference_bh(tbl->nht);
101 hash_val = ndisc_hashfn(pkey, dev, nht->hash_rnd) >> (32 - nht->hash_shift);
102 for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]);
103 n != NULL;
104 n = rcu_dereference_bh(n->next)) {
105 u32 *n32 = (u32 *) n->primary_key;
106 if (n->dev == dev &&
107 ((n32[0] ^ p32[0]) | (n32[1] ^ p32[1]) |
108 (n32[2] ^ p32[2]) | (n32[3] ^ p32[3])) == 0) {
109 if (!atomic_inc_not_zero(&n->refcnt))
110 n = NULL;
111 break;
112 }
113 }
114 rcu_read_unlock_bh();
115
116 return n;
117}
118
Denis V. Lunev9b0f9762008-02-29 11:13:15 -0800119extern int ndisc_init(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120
121extern void ndisc_cleanup(void);
122
123extern int ndisc_rcv(struct sk_buff *skb);
124
125extern void ndisc_send_ns(struct net_device *dev,
126 struct neighbour *neigh,
YOSHIFUJI Hideaki9acd9f32008-04-10 15:42:10 +0900127 const struct in6_addr *solicit,
128 const struct in6_addr *daddr,
129 const struct in6_addr *saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
131extern void ndisc_send_rs(struct net_device *dev,
YOSHIFUJI Hideaki9acd9f32008-04-10 15:42:10 +0900132 const struct in6_addr *saddr,
133 const struct in6_addr *daddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135extern void ndisc_send_redirect(struct sk_buff *skb,
YOSHIFUJI Hideaki9acd9f32008-04-10 15:42:10 +0900136 const struct in6_addr *target);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000138extern int ndisc_mc_map(const struct in6_addr *addr, char *buf,
139 struct net_device *dev, int dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140
Brian Haley305d5522008-11-04 17:51:14 -0800141extern struct sk_buff *ndisc_build_skb(struct net_device *dev,
142 const struct in6_addr *daddr,
143 const struct in6_addr *saddr,
144 struct icmp6hdr *icmp6h,
145 const struct in6_addr *target,
146 int llinfo);
147
148extern void ndisc_send_skb(struct sk_buff *skb,
149 struct net_device *dev,
150 struct neighbour *neigh,
151 const struct in6_addr *daddr,
152 const struct in6_addr *saddr,
153 struct icmp6hdr *icmp6h);
154
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156
157/*
158 * IGMP
159 */
Denis V. Lunev9b0f9762008-02-29 11:13:15 -0800160extern int igmp6_init(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161
162extern void igmp6_cleanup(void);
163
164extern int igmp6_event_query(struct sk_buff *skb);
165
166extern int igmp6_event_report(struct sk_buff *skb);
167
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168
169#ifdef CONFIG_SYSCTL
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200170extern int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 void __user *buffer,
173 size_t *lenp,
174 loff_t *ppos);
Alexey Dobriyanf221e722008-10-15 22:04:23 -0700175int ndisc_ifinfo_sysctl_strategy(ctl_table *ctl,
176 void __user *oldval, size_t __user *oldlenp,
YOSHIFUJI Hideaki0686caa2008-05-19 16:25:42 -0700177 void __user *newval, size_t newlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178#endif
179
180extern void inet6_ifinfo_notify(int event,
181 struct inet6_dev *idev);
182
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183#endif