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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
51#include <net/neighbour.h>
52
53struct ctl_table;
54struct inet6_dev;
55struct net_device;
56struct net_proto_family;
57struct sk_buff;
58
59extern struct neigh_table nd_tbl;
60
61struct nd_msg {
62 struct icmp6hdr icmph;
63 struct in6_addr target;
64 __u8 opt[0];
65};
66
67struct rs_msg {
68 struct icmp6hdr icmph;
69 __u8 opt[0];
70};
71
72struct ra_msg {
73 struct icmp6hdr icmph;
74 __be32 reachable_time;
75 __be32 retrans_timer;
76};
77
78struct nd_opt_hdr {
79 __u8 nd_opt_type;
80 __u8 nd_opt_len;
81} __packed;
82
83static inline u32 ndisc_hashfn(const void *pkey, const struct net_device *dev, __u32 *hash_rnd)
84{
85 const u32 *p32 = pkey;
86
87 return (((p32[0] ^ dev->ifindex) * hash_rnd[0]) +
88 (p32[1] * hash_rnd[1]) +
89 (p32[2] * hash_rnd[2]) +
90 (p32[3] * hash_rnd[3]));
91}
92
93static inline struct neighbour *__ipv6_neigh_lookup(struct neigh_table *tbl, struct net_device *dev, const void *pkey)
94{
95 struct neigh_hash_table *nht;
96 const u32 *p32 = pkey;
97 struct neighbour *n;
98 u32 hash_val;
99
100 rcu_read_lock_bh();
101 nht = rcu_dereference_bh(tbl->nht);
102 hash_val = ndisc_hashfn(pkey, dev, nht->hash_rnd) >> (32 - nht->hash_shift);
103 for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]);
104 n != NULL;
105 n = rcu_dereference_bh(n->next)) {
106 u32 *n32 = (u32 *) n->primary_key;
107 if (n->dev == dev &&
108 ((n32[0] ^ p32[0]) | (n32[1] ^ p32[1]) |
109 (n32[2] ^ p32[2]) | (n32[3] ^ p32[3])) == 0) {
110 if (!atomic_inc_not_zero(&n->refcnt))
111 n = NULL;
112 break;
113 }
114 }
115 rcu_read_unlock_bh();
116
117 return n;
118}
119
120extern int ndisc_init(void);
121
122extern void ndisc_cleanup(void);
123
124extern int ndisc_rcv(struct sk_buff *skb);
125
126extern void ndisc_send_ns(struct net_device *dev,
127 struct neighbour *neigh,
128 const struct in6_addr *solicit,
129 const struct in6_addr *daddr,
130 const struct in6_addr *saddr);
131
132extern void ndisc_send_rs(struct net_device *dev,
133 const struct in6_addr *saddr,
134 const struct in6_addr *daddr);
135
136extern void ndisc_send_redirect(struct sk_buff *skb,
137 const struct in6_addr *target);
138
139extern int ndisc_mc_map(const struct in6_addr *addr, char *buf,
140 struct net_device *dev, int dir);
141
142extern struct sk_buff *ndisc_build_skb(struct net_device *dev,
143 const struct in6_addr *daddr,
144 const struct in6_addr *saddr,
145 struct icmp6hdr *icmp6h,
146 const struct in6_addr *target,
147 int llinfo);
148
149extern void ndisc_send_skb(struct sk_buff *skb,
150 struct net_device *dev,
151 struct neighbour *neigh,
152 const struct in6_addr *daddr,
153 const struct in6_addr *saddr,
154 struct icmp6hdr *icmp6h);
155
156
157
158/*
159 * IGMP
160 */
161extern int igmp6_init(void);
162
163extern void igmp6_cleanup(void);
164
165extern int igmp6_event_query(struct sk_buff *skb);
166
167extern int igmp6_event_report(struct sk_buff *skb);
168
169
170#ifdef CONFIG_SYSCTL
171extern int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl,
172 int write,
173 void __user *buffer,
174 size_t *lenp,
175 loff_t *ppos);
176int ndisc_ifinfo_sysctl_strategy(ctl_table *ctl,
177 void __user *oldval, size_t __user *oldlenp,
178 void __user *newval, size_t newlen);
179#endif
180
181extern void inet6_ifinfo_notify(int event,
182 struct inet6_dev *idev);
183
184#endif