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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#include <linux/if_arp.h>
51#include <linux/netdevice.h>
52
53#include <net/neighbour.h>
54
55struct ctl_table;
56struct inet6_dev;
57struct net_device;
58struct net_proto_family;
59struct sk_buff;
60
61extern struct neigh_table nd_tbl;
62
63struct nd_msg {
64 struct icmp6hdr icmph;
65 struct in6_addr target;
66 __u8 opt[0];
67};
68
69struct rs_msg {
70 struct icmp6hdr icmph;
71 __u8 opt[0];
72};
73
74struct ra_msg {
75 struct icmp6hdr icmph;
76 __be32 reachable_time;
77 __be32 retrans_timer;
78};
79
80struct nd_opt_hdr {
81 __u8 nd_opt_type;
82 __u8 nd_opt_len;
83} __packed;
84
85/* ND options */
86struct ndisc_options {
87 struct nd_opt_hdr *nd_opt_array[__ND_OPT_ARRAY_MAX];
88#ifdef CONFIG_IPV6_ROUTE_INFO
89 struct nd_opt_hdr *nd_opts_ri;
90 struct nd_opt_hdr *nd_opts_ri_end;
91#endif
92 struct nd_opt_hdr *nd_useropts;
93 struct nd_opt_hdr *nd_useropts_end;
94};
95
96#define nd_opts_src_lladdr nd_opt_array[ND_OPT_SOURCE_LL_ADDR]
97#define nd_opts_tgt_lladdr nd_opt_array[ND_OPT_TARGET_LL_ADDR]
98#define nd_opts_pi nd_opt_array[ND_OPT_PREFIX_INFO]
99#define nd_opts_pi_end nd_opt_array[__ND_OPT_PREFIX_INFO_END]
100#define nd_opts_rh nd_opt_array[ND_OPT_REDIRECT_HDR]
101#define nd_opts_mtu nd_opt_array[ND_OPT_MTU]
102
103#define NDISC_OPT_SPACE(len) (((len)+2+7)&~7)
104
105extern struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len,
106 struct ndisc_options *ndopts);
107
108/*
109 * Return the padding between the option length and the start of the
110 * link addr. Currently only IP-over-InfiniBand needs this, although
111 * if RFC 3831 IPv6-over-Fibre Channel is ever implemented it may
112 * also need a pad of 2.
113 */
114static int ndisc_addr_option_pad(unsigned short type)
115{
116 switch (type) {
117 case ARPHRD_INFINIBAND: return 2;
118 default: return 0;
119 }
120}
121
122static inline u8 *ndisc_opt_addr_data(struct nd_opt_hdr *p,
123 struct net_device *dev)
124{
125 u8 *lladdr = (u8 *)(p + 1);
126 int lladdrlen = p->nd_opt_len << 3;
127 int prepad = ndisc_addr_option_pad(dev->type);
128 if (lladdrlen != NDISC_OPT_SPACE(dev->addr_len + prepad))
129 return NULL;
130 return lladdr + prepad;
131}
132
133static inline u32 ndisc_hashfn(const void *pkey, const struct net_device *dev, __u32 *hash_rnd)
134{
135 const u32 *p32 = pkey;
136
137 return (((p32[0] ^ dev->ifindex) * hash_rnd[0]) +
138 (p32[1] * hash_rnd[1]) +
139 (p32[2] * hash_rnd[2]) +
140 (p32[3] * hash_rnd[3]));
141}
142
143static inline struct neighbour *__ipv6_neigh_lookup(struct neigh_table *tbl, struct net_device *dev, const void *pkey)
144{
145 struct neigh_hash_table *nht;
146 const u32 *p32 = pkey;
147 struct neighbour *n;
148 u32 hash_val;
149
150 rcu_read_lock_bh();
151 nht = rcu_dereference_bh(tbl->nht);
152 hash_val = ndisc_hashfn(pkey, dev, nht->hash_rnd) >> (32 - nht->hash_shift);
153 for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]);
154 n != NULL;
155 n = rcu_dereference_bh(n->next)) {
156 u32 *n32 = (u32 *) n->primary_key;
157 if (n->dev == dev &&
158 ((n32[0] ^ p32[0]) | (n32[1] ^ p32[1]) |
159 (n32[2] ^ p32[2]) | (n32[3] ^ p32[3])) == 0) {
160 if (!atomic_inc_not_zero(&n->refcnt))
161 n = NULL;
162 break;
163 }
164 }
165 rcu_read_unlock_bh();
166
167 return n;
168}
169
170extern int ndisc_init(void);
171
172extern void ndisc_cleanup(void);
173
174extern int ndisc_rcv(struct sk_buff *skb);
175
176extern void ndisc_send_ns(struct net_device *dev,
177 struct neighbour *neigh,
178 const struct in6_addr *solicit,
179 const struct in6_addr *daddr,
180 const struct in6_addr *saddr);
181
182extern void ndisc_send_rs(struct net_device *dev,
183 const struct in6_addr *saddr,
184 const struct in6_addr *daddr);
185
186extern void ndisc_send_redirect(struct sk_buff *skb,
187 const struct in6_addr *target);
188
189extern int ndisc_mc_map(const struct in6_addr *addr, char *buf,
190 struct net_device *dev, int dir);
191
192extern struct sk_buff *ndisc_build_skb(struct net_device *dev,
193 const struct in6_addr *daddr,
194 const struct in6_addr *saddr,
195 struct icmp6hdr *icmp6h,
196 const struct in6_addr *target,
197 int llinfo);
198
199extern void ndisc_send_skb(struct sk_buff *skb,
200 struct net_device *dev,
201 struct neighbour *neigh,
202 const struct in6_addr *daddr,
203 const struct in6_addr *saddr,
204 struct icmp6hdr *icmp6h);
205
206
207
208/*
209 * IGMP
210 */
211extern int igmp6_init(void);
212
213extern void igmp6_cleanup(void);
214
215extern int igmp6_event_query(struct sk_buff *skb);
216
217extern int igmp6_event_report(struct sk_buff *skb);
218
219
220#ifdef CONFIG_SYSCTL
221extern int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl,
222 int write,
223 void __user *buffer,
224 size_t *lenp,
225 loff_t *ppos);
226int ndisc_ifinfo_sysctl_strategy(ctl_table *ctl,
227 void __user *oldval, size_t __user *oldlenp,
228 void __user *newval, size_t newlen);
229#endif
230
231extern void inet6_ifinfo_notify(int event,
232 struct inet6_dev *idev);
233
234#endif