5 * ICMP codes for neighbour discovery messages
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
15 * Router type: cross-layer information from link-layer to
16 * IPv6 layer reported by certain link types (e.g., RFC4214).
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 */
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 */
35 ND_OPT_ROUTE_INFO
= 24, /* RFC4191 */
36 ND_OPT_RDNSS
= 25, /* RFC5006 */
37 ND_OPT_DNSSL
= 31, /* RFC6106 */
41 #define MAX_RTR_SOLICITATION_DELAY HZ
43 #define ND_REACHABLE_TIME (30*HZ)
44 #define ND_RETRANS_TIMER HZ
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>
54 #include <net/neighbour.h>
59 struct net_proto_family
;
62 extern struct neigh_table nd_tbl
;
65 struct icmp6hdr icmph
;
66 struct in6_addr target
;
71 struct icmp6hdr icmph
;
76 struct icmp6hdr icmph
;
77 __be32 reachable_time
;
82 struct icmp6hdr icmph
;
83 struct in6_addr target
;
94 struct 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
;
100 struct nd_opt_hdr
*nd_useropts
;
101 struct nd_opt_hdr
*nd_useropts_end
;
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]
111 #define NDISC_OPT_SPACE(len) (((len)+2+7)&~7)
113 extern struct ndisc_options
*ndisc_parse_options(u8
*opt
, int opt_len
,
114 struct ndisc_options
*ndopts
);
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.
122 static int ndisc_addr_option_pad(unsigned short type
)
125 case ARPHRD_INFINIBAND
: return 2;
130 static inline int ndisc_opt_addr_space(struct net_device
*dev
)
132 return NDISC_OPT_SPACE(dev
->addr_len
+
133 ndisc_addr_option_pad(dev
->type
));
136 static inline u8
*ndisc_opt_addr_data(struct nd_opt_hdr
*p
,
137 struct net_device
*dev
)
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
))
144 return lladdr
+ prepad
;
147 static inline u32
ndisc_hashfn(const void *pkey
, const struct net_device
*dev
, __u32
*hash_rnd
)
149 const u32
*p32
= pkey
;
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]));
157 static inline struct neighbour
*__ipv6_neigh_lookup_noref(struct net_device
*dev
, const void *pkey
)
159 struct neigh_hash_table
*nht
;
160 const u32
*p32
= pkey
;
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
]);
168 n
= rcu_dereference_bh(n
->next
)) {
169 u32
*n32
= (u32
*) n
->primary_key
;
171 ((n32
[0] ^ p32
[0]) | (n32
[1] ^ p32
[1]) |
172 (n32
[2] ^ p32
[2]) | (n32
[3] ^ p32
[3])) == 0)
179 static inline struct neighbour
*__ipv6_neigh_lookup(struct net_device
*dev
, const void *pkey
)
184 n
= __ipv6_neigh_lookup_noref(dev
, pkey
);
185 if (n
&& !atomic_inc_not_zero(&n
->refcnt
))
187 rcu_read_unlock_bh();
192 extern int ndisc_init(void);
194 extern void ndisc_cleanup(void);
196 extern int ndisc_rcv(struct sk_buff
*skb
);
198 extern void ndisc_send_ns(struct net_device
*dev
,
199 struct neighbour
*neigh
,
200 const struct in6_addr
*solicit
,
201 const struct in6_addr
*daddr
,
202 const struct in6_addr
*saddr
);
204 extern void ndisc_send_rs(struct net_device
*dev
,
205 const struct in6_addr
*saddr
,
206 const struct in6_addr
*daddr
);
208 extern void ndisc_send_redirect(struct sk_buff
*skb
,
209 const struct in6_addr
*target
);
211 extern int ndisc_mc_map(const struct in6_addr
*addr
, char *buf
,
212 struct net_device
*dev
, int dir
);
218 extern int igmp6_init(void);
220 extern void igmp6_cleanup(void);
222 extern int igmp6_event_query(struct sk_buff
*skb
);
224 extern int igmp6_event_report(struct sk_buff
*skb
);
228 extern int ndisc_ifinfo_sysctl_change(struct ctl_table
*ctl
,
233 int ndisc_ifinfo_sysctl_strategy(ctl_table
*ctl
,
234 void __user
*oldval
, size_t __user
*oldlenp
,
235 void __user
*newval
, size_t newlen
);
238 extern void inet6_ifinfo_notify(int event
,
239 struct inet6_dev
*idev
);
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