Commit | Line | Data |
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1da177e4 LT |
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 | ||
fadf6bf0 TF |
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 | ||
1da177e4 LT |
23 | /* |
24 | * ndisc options | |
25 | */ | |
26 | ||
27 | enum { | |
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 */ | |
70ceb4f5 YH |
34 | __ND_OPT_ARRAY_MAX, |
35 | ND_OPT_ROUTE_INFO = 24, /* RFC4191 */ | |
31910575 | 36 | ND_OPT_RDNSS = 25, /* RFC5006 */ |
e35f30c1 | 37 | ND_OPT_DNSSL = 31, /* RFC6106 */ |
1da177e4 LT |
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 | ||
14c85021 | 46 | #include <linux/compiler.h> |
1da177e4 | 47 | #include <linux/icmpv6.h> |
14c85021 ACM |
48 | #include <linux/in6.h> |
49 | #include <linux/types.h> | |
30f2a5f3 DM |
50 | #include <linux/if_arp.h> |
51 | #include <linux/netdevice.h> | |
14c85021 | 52 | |
1da177e4 | 53 | #include <net/neighbour.h> |
14c85021 ACM |
54 | |
55 | struct ctl_table; | |
14c85021 ACM |
56 | struct inet6_dev; |
57 | struct net_device; | |
58 | struct net_proto_family; | |
59 | struct sk_buff; | |
1da177e4 LT |
60 | |
61 | extern struct neigh_table nd_tbl; | |
62 | ||
63 | struct nd_msg { | |
64 | struct icmp6hdr icmph; | |
65 | struct in6_addr target; | |
66 | __u8 opt[0]; | |
67 | }; | |
68 | ||
69 | struct rs_msg { | |
70 | struct icmp6hdr icmph; | |
71 | __u8 opt[0]; | |
72 | }; | |
73 | ||
74 | struct ra_msg { | |
75 | struct icmp6hdr icmph; | |
e69a4adc AV |
76 | __be32 reachable_time; |
77 | __be32 retrans_timer; | |
1da177e4 LT |
78 | }; |
79 | ||
80 | struct nd_opt_hdr { | |
81 | __u8 nd_opt_type; | |
82 | __u8 nd_opt_len; | |
bc10502d | 83 | } __packed; |
1da177e4 | 84 | |
30f2a5f3 DM |
85 | /* ND options */ |
86 | struct 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 | ||
105 | extern 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 | */ | |
114 | static 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 | ||
122 | static 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 | ||
2c2aba6c DM |
133 | static 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 | } | |
1da177e4 | 142 | |
f83c7790 DM |
143 | static 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 | ||
9b0f976f | 170 | extern int ndisc_init(void); |
1da177e4 LT |
171 | |
172 | extern void ndisc_cleanup(void); | |
173 | ||
174 | extern int ndisc_rcv(struct sk_buff *skb); | |
175 | ||
176 | extern void ndisc_send_ns(struct net_device *dev, | |
177 | struct neighbour *neigh, | |
9acd9f3a YH |
178 | const struct in6_addr *solicit, |
179 | const struct in6_addr *daddr, | |
180 | const struct in6_addr *saddr); | |
1da177e4 LT |
181 | |
182 | extern void ndisc_send_rs(struct net_device *dev, | |
9acd9f3a YH |
183 | const struct in6_addr *saddr, |
184 | const struct in6_addr *daddr); | |
1da177e4 | 185 | |
1da177e4 | 186 | extern void ndisc_send_redirect(struct sk_buff *skb, |
9acd9f3a | 187 | const struct in6_addr *target); |
1da177e4 | 188 | |
b71d1d42 ED |
189 | extern int ndisc_mc_map(const struct in6_addr *addr, char *buf, |
190 | struct net_device *dev, int dir); | |
1da177e4 | 191 | |
305d552a BH |
192 | extern 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 | ||
199 | extern 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 | ||
1da177e4 | 206 | |
1da177e4 LT |
207 | |
208 | /* | |
209 | * IGMP | |
210 | */ | |
9b0f976f | 211 | extern int igmp6_init(void); |
1da177e4 LT |
212 | |
213 | extern void igmp6_cleanup(void); | |
214 | ||
215 | extern int igmp6_event_query(struct sk_buff *skb); | |
216 | ||
217 | extern int igmp6_event_report(struct sk_buff *skb); | |
218 | ||
1da177e4 LT |
219 | |
220 | #ifdef CONFIG_SYSCTL | |
14c85021 | 221 | extern int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, |
1da177e4 | 222 | int write, |
1da177e4 LT |
223 | void __user *buffer, |
224 | size_t *lenp, | |
225 | loff_t *ppos); | |
f221e726 AD |
226 | int ndisc_ifinfo_sysctl_strategy(ctl_table *ctl, |
227 | void __user *oldval, size_t __user *oldlenp, | |
0686caa3 | 228 | void __user *newval, size_t newlen); |
1da177e4 LT |
229 | #endif |
230 | ||
231 | extern void inet6_ifinfo_notify(int event, | |
232 | struct inet6_dev *idev); | |
233 | ||
1da177e4 | 234 | #endif |