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_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
45 #include <linux/compiler.h>
46 #include <linux/icmpv6.h>
47 #include <linux/in6.h>
48 #include <linux/types.h>
49
50 #include <net/neighbour.h>
51
52 struct ctl_table;
53 struct inet6_dev;
54 struct net_device;
55 struct net_proto_family;
56 struct sk_buff;
57
58 extern struct neigh_table nd_tbl;
59
60 struct nd_msg {
61 struct icmp6hdr icmph;
62 struct in6_addr target;
63 __u8 opt[0];
64 };
65
66 struct rs_msg {
67 struct icmp6hdr icmph;
68 __u8 opt[0];
69 };
70
71 struct ra_msg {
72 struct icmp6hdr icmph;
73 __be32 reachable_time;
74 __be32 retrans_timer;
75 };
76
77 struct nd_opt_hdr {
78 __u8 nd_opt_type;
79 __u8 nd_opt_len;
80 } __packed;
81
ndisc_hashfn(const void * pkey,const struct net_device * dev,__u32 * hash_rnd)82 static 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 }
91
__ipv6_neigh_lookup(struct neigh_table * tbl,struct net_device * dev,const void * pkey)92 static 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
119 extern int ndisc_init(void);
120
121 extern void ndisc_cleanup(void);
122
123 extern int ndisc_rcv(struct sk_buff *skb);
124
125 extern void ndisc_send_ns(struct net_device *dev,
126 struct neighbour *neigh,
127 const struct in6_addr *solicit,
128 const struct in6_addr *daddr,
129 const struct in6_addr *saddr);
130
131 extern void ndisc_send_rs(struct net_device *dev,
132 const struct in6_addr *saddr,
133 const struct in6_addr *daddr);
134
135 extern void ndisc_send_redirect(struct sk_buff *skb,
136 const struct in6_addr *target);
137
138 extern int ndisc_mc_map(const struct in6_addr *addr, char *buf,
139 struct net_device *dev, int dir);
140
141 extern 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
148 extern 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
155
156
157 /*
158 * IGMP
159 */
160 extern int igmp6_init(void);
161
162 extern void igmp6_cleanup(void);
163
164 extern int igmp6_event_query(struct sk_buff *skb);
165
166 extern int igmp6_event_report(struct sk_buff *skb);
167
168
169 #ifdef CONFIG_SYSCTL
170 extern int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl,
171 int write,
172 void __user *buffer,
173 size_t *lenp,
174 loff_t *ppos);
175 int ndisc_ifinfo_sysctl_strategy(ctl_table *ctl,
176 void __user *oldval, size_t __user *oldlenp,
177 void __user *newval, size_t newlen);
178 #endif
179
180 extern void inet6_ifinfo_notify(int event,
181 struct inet6_dev *idev);
182
183 #endif
184