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#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/* ND options */
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
113struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len,
114					  struct ndisc_options *ndopts);
115
116/*
117 * Return the padding between the option length and the start of the
118 * link addr.  Currently only IP-over-InfiniBand needs this, although
119 * if RFC 3831 IPv6-over-Fibre Channel is ever implemented it may
120 * also need a pad of 2.
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	return ___neigh_lookup_noref(&nd_tbl, neigh_key_eq128, ndisc_hashfn, pkey, dev);
160}
161
162static inline struct neighbour *__ipv6_neigh_lookup(struct net_device *dev, const void *pkey)
163{
164	struct neighbour *n;
165
166	rcu_read_lock_bh();
167	n = __ipv6_neigh_lookup_noref(dev, pkey);
168	if (n && !atomic_inc_not_zero(&n->refcnt))
169		n = NULL;
170	rcu_read_unlock_bh();
171
172	return n;
173}
174
175int ndisc_init(void);
176int ndisc_late_init(void);
177
178void ndisc_late_cleanup(void);
179void ndisc_cleanup(void);
180
181int ndisc_rcv(struct sk_buff *skb);
182
183void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh,
184		   const struct in6_addr *solicit,
185		   const struct in6_addr *daddr, const struct in6_addr *saddr);
186
187void ndisc_send_rs(struct net_device *dev,
188		   const struct in6_addr *saddr, const struct in6_addr *daddr);
189void ndisc_send_na(struct net_device *dev, struct neighbour *neigh,
190		   const struct in6_addr *daddr,
191		   const struct in6_addr *solicited_addr,
192		   bool router, bool solicited, bool override, bool inc_opt);
193
194void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target);
195
196int ndisc_mc_map(const struct in6_addr *addr, char *buf, struct net_device *dev,
197		 int dir);
198
199
200/*
201 *	IGMP
202 */
203int igmp6_init(void);
204
205void igmp6_cleanup(void);
206
207int igmp6_event_query(struct sk_buff *skb);
208
209int igmp6_event_report(struct sk_buff *skb);
210
211
212#ifdef CONFIG_SYSCTL
213int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write,
214			       void __user *buffer, size_t *lenp, loff_t *ppos);
215int ndisc_ifinfo_sysctl_strategy(struct ctl_table *ctl,
216				 void __user *oldval, size_t __user *oldlenp,
217				 void __user *newval, size_t newlen);
218#endif
219
220void inet6_ifinfo_notify(int event, struct inet6_dev *idev);
221
222#endif
223