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
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 */
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_CAPTIVE_PORTAL = 37, /* RFC7710 */
39 __ND_OPT_MAX
40 };
41
42 #define MAX_RTR_SOLICITATION_DELAY HZ
43
44 #define ND_REACHABLE_TIME (30*HZ)
45 #define ND_RETRANS_TIMER HZ
46
47 #include <linux/compiler.h>
48 #include <linux/icmpv6.h>
49 #include <linux/in6.h>
50 #include <linux/types.h>
51 #include <linux/if_arp.h>
52 #include <linux/netdevice.h>
53 #include <linux/hash.h>
54
55 #include <net/neighbour.h>
56
57 struct ctl_table;
58 struct inet6_dev;
59 struct net_device;
60 struct net_proto_family;
61 struct sk_buff;
62
63 extern struct neigh_table nd_tbl;
64
65 struct nd_msg {
66 struct icmp6hdr icmph;
67 struct in6_addr target;
68 __u8 opt[0];
69 };
70
71 struct rs_msg {
72 struct icmp6hdr icmph;
73 __u8 opt[0];
74 };
75
76 struct ra_msg {
77 struct icmp6hdr icmph;
78 __be32 reachable_time;
79 __be32 retrans_timer;
80 };
81
82 struct rd_msg {
83 struct icmp6hdr icmph;
84 struct in6_addr target;
85 struct in6_addr dest;
86 __u8 opt[0];
87 };
88
89 struct nd_opt_hdr {
90 __u8 nd_opt_type;
91 __u8 nd_opt_len;
92 } __packed;
93
94 /* ND options */
95 struct ndisc_options {
96 struct nd_opt_hdr *nd_opt_array[__ND_OPT_ARRAY_MAX];
97 #ifdef CONFIG_IPV6_ROUTE_INFO
98 struct nd_opt_hdr *nd_opts_ri;
99 struct nd_opt_hdr *nd_opts_ri_end;
100 #endif
101 struct nd_opt_hdr *nd_useropts;
102 struct nd_opt_hdr *nd_useropts_end;
103 };
104
105 #define nd_opts_src_lladdr nd_opt_array[ND_OPT_SOURCE_LL_ADDR]
106 #define nd_opts_tgt_lladdr nd_opt_array[ND_OPT_TARGET_LL_ADDR]
107 #define nd_opts_pi nd_opt_array[ND_OPT_PREFIX_INFO]
108 #define nd_opts_pi_end nd_opt_array[__ND_OPT_PREFIX_INFO_END]
109 #define nd_opts_rh nd_opt_array[ND_OPT_REDIRECT_HDR]
110 #define nd_opts_mtu nd_opt_array[ND_OPT_MTU]
111
112 #define NDISC_OPT_SPACE(len) (((len)+2+7)&~7)
113
114 struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len,
115 struct ndisc_options *ndopts);
116
117 /*
118 * Return the padding between the option length and the start of the
119 * link addr. Currently only IP-over-InfiniBand needs this, although
120 * if RFC 3831 IPv6-over-Fibre Channel is ever implemented it may
121 * also need a pad of 2.
122 */
ndisc_addr_option_pad(unsigned short type)123 static inline int ndisc_addr_option_pad(unsigned short type)
124 {
125 switch (type) {
126 case ARPHRD_INFINIBAND: return 2;
127 default: return 0;
128 }
129 }
130
ndisc_opt_addr_space(struct net_device * dev)131 static inline int ndisc_opt_addr_space(struct net_device *dev)
132 {
133 return NDISC_OPT_SPACE(dev->addr_len +
134 ndisc_addr_option_pad(dev->type));
135 }
136
ndisc_opt_addr_data(struct nd_opt_hdr * p,struct net_device * dev)137 static inline u8 *ndisc_opt_addr_data(struct nd_opt_hdr *p,
138 struct net_device *dev)
139 {
140 u8 *lladdr = (u8 *)(p + 1);
141 int lladdrlen = p->nd_opt_len << 3;
142 int prepad = ndisc_addr_option_pad(dev->type);
143 if (lladdrlen != ndisc_opt_addr_space(dev))
144 return NULL;
145 return lladdr + prepad;
146 }
147
ndisc_hashfn(const void * pkey,const struct net_device * dev,__u32 * hash_rnd)148 static inline u32 ndisc_hashfn(const void *pkey, const struct net_device *dev, __u32 *hash_rnd)
149 {
150 const u32 *p32 = pkey;
151
152 return (((p32[0] ^ hash32_ptr(dev)) * hash_rnd[0]) +
153 (p32[1] * hash_rnd[1]) +
154 (p32[2] * hash_rnd[2]) +
155 (p32[3] * hash_rnd[3]));
156 }
157
__ipv6_neigh_lookup_noref(struct net_device * dev,const void * pkey)158 static inline struct neighbour *__ipv6_neigh_lookup_noref(struct net_device *dev, const void *pkey)
159 {
160 return ___neigh_lookup_noref(&nd_tbl, neigh_key_eq128, ndisc_hashfn, pkey, dev);
161 }
162
__ipv6_neigh_lookup(struct net_device * dev,const void * pkey)163 static inline struct neighbour *__ipv6_neigh_lookup(struct net_device *dev, const void *pkey)
164 {
165 struct neighbour *n;
166
167 rcu_read_lock_bh();
168 n = __ipv6_neigh_lookup_noref(dev, pkey);
169 if (n && !atomic_inc_not_zero(&n->refcnt))
170 n = NULL;
171 rcu_read_unlock_bh();
172
173 return n;
174 }
175
176 int ndisc_init(void);
177 int ndisc_late_init(void);
178
179 void ndisc_late_cleanup(void);
180 void ndisc_cleanup(void);
181
182 int ndisc_rcv(struct sk_buff *skb);
183
184 void ndisc_send_ns(struct net_device *dev, const struct in6_addr *solicit,
185 const struct in6_addr *daddr, const struct in6_addr *saddr);
186
187 void ndisc_send_rs(struct net_device *dev,
188 const struct in6_addr *saddr, const struct in6_addr *daddr);
189 void ndisc_send_na(struct net_device *dev, const struct in6_addr *daddr,
190 const struct in6_addr *solicited_addr,
191 bool router, bool solicited, bool override, bool inc_opt);
192
193 void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target);
194
195 int ndisc_mc_map(const struct in6_addr *addr, char *buf, struct net_device *dev,
196 int dir);
197
198
199 /*
200 * IGMP
201 */
202 int igmp6_init(void);
203
204 void igmp6_cleanup(void);
205
206 int igmp6_event_query(struct sk_buff *skb);
207
208 int igmp6_event_report(struct sk_buff *skb);
209
210
211 #ifdef CONFIG_SYSCTL
212 int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write,
213 void __user *buffer, size_t *lenp, loff_t *ppos);
214 int ndisc_ifinfo_sysctl_strategy(struct ctl_table *ctl,
215 void __user *oldval, size_t __user *oldlenp,
216 void __user *newval, size_t newlen);
217 #endif
218
219 void inet6_ifinfo_notify(int event, struct inet6_dev *idev);
220
221 #endif
222