1#ifndef _NDISC_H
2#define _NDISC_H
3
4
5
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
16
17
18#define NDISC_NODETYPE_UNSPEC 0
19#define NDISC_NODETYPE_HOST 1
20#define NDISC_NODETYPE_NODEFAULT 2
21#define NDISC_NODETYPE_DEFAULT 3
22
23
24
25
26
27enum {
28 __ND_OPT_PREFIX_INFO_END = 0,
29 ND_OPT_SOURCE_LL_ADDR = 1,
30 ND_OPT_TARGET_LL_ADDR = 2,
31 ND_OPT_PREFIX_INFO = 3,
32 ND_OPT_REDIRECT_HDR = 4,
33 ND_OPT_MTU = 5,
34 __ND_OPT_ARRAY_MAX,
35 ND_OPT_ROUTE_INFO = 24,
36 ND_OPT_RDNSS = 25,
37 ND_OPT_DNSSL = 31,
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
56struct ctl_table;
57struct inet6_dev;
58struct net_device;
59struct net_proto_family;
60struct sk_buff;
61
62extern struct neigh_table nd_tbl;
63
64struct nd_msg {
65 struct icmp6hdr icmph;
66 struct in6_addr target;
67 __u8 opt[0];
68};
69
70struct rs_msg {
71 struct icmp6hdr icmph;
72 __u8 opt[0];
73};
74
75struct ra_msg {
76 struct icmp6hdr icmph;
77 __be32 reachable_time;
78 __be32 retrans_timer;
79};
80
81struct rd_msg {
82 struct icmp6hdr icmph;
83 struct in6_addr target;
84 struct in6_addr dest;
85 __u8 opt[0];
86};
87
88struct nd_opt_hdr {
89 __u8 nd_opt_type;
90 __u8 nd_opt_len;
91} __packed;
92
93
94struct 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
113extern struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len,
114 struct ndisc_options *ndopts);
115
116
117
118
119
120
121
122static 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
130static 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
136static 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
147static 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
157static 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
179static 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
192extern int ndisc_init(void);
193extern int ndisc_late_init(void);
194
195extern void ndisc_late_cleanup(void);
196extern void ndisc_cleanup(void);
197
198extern int ndisc_rcv(struct sk_buff *skb);
199
200extern 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
206extern void ndisc_send_rs(struct net_device *dev,
207 const struct in6_addr *saddr,
208 const struct in6_addr *daddr);
209extern 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
215extern void ndisc_send_redirect(struct sk_buff *skb,
216 const struct in6_addr *target);
217
218extern int ndisc_mc_map(const struct in6_addr *addr, char *buf,
219 struct net_device *dev, int dir);
220
221
222
223
224
225extern int igmp6_init(void);
226
227extern void igmp6_cleanup(void);
228
229extern int igmp6_event_query(struct sk_buff *skb);
230
231extern int igmp6_event_report(struct sk_buff *skb);
232
233
234#ifdef CONFIG_SYSCTL
235extern int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl,
236 int write,
237 void __user *buffer,
238 size_t *lenp,
239 loff_t *ppos);
240int 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
245extern void inet6_ifinfo_notify(int event,
246 struct inet6_dev *idev);
247
248#endif
249
