blob: 949d77528f2f9cd87839029b424bded13cb52136 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001#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/*
Templin, Fred Lfadf6bf2008-03-11 18:35:59 -040015 * 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/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070024 * 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 */
YOSHIFUJI Hideaki70ceb4f2006-03-20 17:06:24 -080034 __ND_OPT_ARRAY_MAX,
35 ND_OPT_ROUTE_INFO = 24, /* RFC4191 */
Pierre Ynard31910572007-10-10 21:22:05 -070036 ND_OPT_RDNSS = 25, /* RFC5006 */
Alexey I. Froloffe35f30c2012-04-06 05:50:58 +000037 ND_OPT_DNSSL = 31, /* RFC6106 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070038 __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
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020046#include <linux/compiler.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070047#include <linux/icmpv6.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020048#include <linux/in6.h>
49#include <linux/types.h>
David S. Miller30f2a5f2012-07-11 23:26:46 -070050#include <linux/if_arp.h>
51#include <linux/netdevice.h>
Pavel Emelyanovb14f2432012-08-08 21:52:28 +000052#include <linux/hash.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020053
Linus Torvalds1da177e2005-04-16 15:20:36 -070054#include <net/neighbour.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020055
56struct ctl_table;
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020057struct inet6_dev;
58struct net_device;
59struct net_proto_family;
60struct sk_buff;
Linus Torvalds1da177e2005-04-16 15:20:36 -070061
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;
Al Viroe69a4adc2006-11-14 20:56:00 -080077 __be32 reachable_time;
78 __be32 retrans_timer;
Linus Torvalds1da177e2005-04-16 15:20:36 -070079};
80
Duan Jiong093d04d2012-12-14 02:59:59 +000081struct rd_msg {
82 struct icmp6hdr icmph;
83 struct in6_addr target;
84 struct in6_addr dest;
85 __u8 opt[0];
86};
87
Linus Torvalds1da177e2005-04-16 15:20:36 -070088struct nd_opt_hdr {
89 __u8 nd_opt_type;
90 __u8 nd_opt_len;
Eric Dumazetbc105022010-06-03 03:21:52 -070091} __packed;
Linus Torvalds1da177e2005-04-16 15:20:36 -070092
David S. Miller30f2a5f2012-07-11 23:26:46 -070093/* 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
113extern struct 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 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
YOSHIFUJI Hideaki / 吉藤英明c558e9f2013-01-21 06:47:56 +0000130static 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
David S. Miller30f2a5f2012-07-11 23:26:46 -0700136static 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);
YOSHIFUJI Hideaki / 吉藤英明c558e9f2013-01-21 06:47:56 +0000142 if (lladdrlen != ndisc_opt_addr_space(dev))
David S. Miller30f2a5f2012-07-11 23:26:46 -0700143 return NULL;
144 return lladdr + prepad;
145}
146
David S. Miller2c2aba62011-12-28 15:06:58 -0500147static inline u32 ndisc_hashfn(const void *pkey, const struct net_device *dev, __u32 *hash_rnd)
148{
149 const u32 *p32 = pkey;
150
Pavel Emelyanovb14f2432012-08-08 21:52:28 +0000151 return (((p32[0] ^ hash32_ptr(dev)) * hash_rnd[0]) +
David S. Miller2c2aba62011-12-28 15:06:58 -0500152 (p32[1] * hash_rnd[1]) +
153 (p32[2] * hash_rnd[2]) +
154 (p32[3] * hash_rnd[3]));
155}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156
YOSHIFUJI Hideaki / 吉藤英明ac3175f2013-01-17 12:53:22 +0000157static inline struct neighbour *__ipv6_neigh_lookup_noref(struct net_device *dev, const void *pkey)
David S. Millerf83c7792011-12-28 15:41:23 -0500158{
159 struct neigh_hash_table *nht;
160 const u32 *p32 = pkey;
161 struct neighbour *n;
162 u32 hash_val;
163
YOSHIFUJI Hideaki / 吉藤英明8e022ee2013-01-17 12:53:09 +0000164 nht = rcu_dereference_bh(nd_tbl.nht);
David S. Millerf83c7792011-12-28 15:41:23 -0500165 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]) |
YOSHIFUJI Hideaki / 吉藤英明ac3175f2013-01-17 12:53:22 +0000172 (n32[2] ^ p32[2]) | (n32[3] ^ p32[3])) == 0)
173 return n;
David S. Millerf83c7792011-12-28 15:41:23 -0500174 }
YOSHIFUJI Hideaki / 吉藤英明ac3175f2013-01-17 12:53:22 +0000175
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;
David S. Millerf83c7792011-12-28 15:41:23 -0500187 rcu_read_unlock_bh();
188
189 return n;
190}
191
Denis V. Lunev9b0f9762008-02-29 11:13:15 -0800192extern int ndisc_init(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193
194extern void ndisc_cleanup(void);
195
196extern int ndisc_rcv(struct sk_buff *skb);
197
198extern void ndisc_send_ns(struct net_device *dev,
199 struct neighbour *neigh,
YOSHIFUJI Hideaki9acd9f32008-04-10 15:42:10 +0900200 const struct in6_addr *solicit,
201 const struct in6_addr *daddr,
202 const struct in6_addr *saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203
204extern void ndisc_send_rs(struct net_device *dev,
YOSHIFUJI Hideaki9acd9f32008-04-10 15:42:10 +0900205 const struct in6_addr *saddr,
206 const struct in6_addr *daddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208extern void ndisc_send_redirect(struct sk_buff *skb,
YOSHIFUJI Hideaki9acd9f32008-04-10 15:42:10 +0900209 const struct in6_addr *target);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000211extern int ndisc_mc_map(const struct in6_addr *addr, char *buf,
212 struct net_device *dev, int dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214
215/*
216 * IGMP
217 */
Denis V. Lunev9b0f9762008-02-29 11:13:15 -0800218extern int igmp6_init(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219
220extern void igmp6_cleanup(void);
221
222extern int igmp6_event_query(struct sk_buff *skb);
223
224extern int igmp6_event_report(struct sk_buff *skb);
225
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226
227#ifdef CONFIG_SYSCTL
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200228extern int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 void __user *buffer,
231 size_t *lenp,
232 loff_t *ppos);
Joe Perchesfedaf4f2013-06-13 19:37:54 -0700233int ndisc_ifinfo_sysctl_strategy(struct ctl_table *ctl,
Alexey Dobriyanf221e722008-10-15 22:04:23 -0700234 void __user *oldval, size_t __user *oldlenp,
YOSHIFUJI Hideaki0686caa2008-05-19 16:25:42 -0700235 void __user *newval, size_t newlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236#endif
237
238extern void inet6_ifinfo_notify(int event,
239 struct inet6_dev *idev);
240
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241#endif