xref: /openbmc/linux/include/net/ndisc.h (revision 9ac8d3fb)
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_MAX
38 };
39 
40 #define MAX_RTR_SOLICITATION_DELAY	HZ
41 
42 #define ND_REACHABLE_TIME		(30*HZ)
43 #define ND_RETRANS_TIMER		HZ
44 
45 #define ND_MIN_RANDOM_FACTOR		(1/2)
46 #define ND_MAX_RANDOM_FACTOR		(3/2)
47 
48 #ifdef __KERNEL__
49 
50 #include <linux/compiler.h>
51 #include <linux/icmpv6.h>
52 #include <linux/in6.h>
53 #include <linux/types.h>
54 
55 #include <net/neighbour.h>
56 
57 struct ctl_table;
58 struct file;
59 struct inet6_dev;
60 struct net_device;
61 struct net_proto_family;
62 struct sk_buff;
63 
64 extern struct neigh_table nd_tbl;
65 
66 struct nd_msg {
67         struct icmp6hdr	icmph;
68         struct in6_addr	target;
69 	__u8		opt[0];
70 };
71 
72 struct rs_msg {
73 	struct icmp6hdr	icmph;
74 	__u8		opt[0];
75 };
76 
77 struct ra_msg {
78         struct icmp6hdr		icmph;
79 	__be32			reachable_time;
80 	__be32			retrans_timer;
81 };
82 
83 struct nd_opt_hdr {
84 	__u8		nd_opt_type;
85 	__u8		nd_opt_len;
86 } __attribute__((__packed__));
87 
88 
89 extern int			ndisc_init(void);
90 
91 extern void			ndisc_cleanup(void);
92 
93 extern int			ndisc_rcv(struct sk_buff *skb);
94 
95 extern void			ndisc_send_ns(struct net_device *dev,
96 					      struct neighbour *neigh,
97 					      const struct in6_addr *solicit,
98 					      const struct in6_addr *daddr,
99 					      const struct in6_addr *saddr);
100 
101 extern void			ndisc_send_rs(struct net_device *dev,
102 					      const struct in6_addr *saddr,
103 					      const struct in6_addr *daddr);
104 
105 extern void			ndisc_send_redirect(struct sk_buff *skb,
106 						    struct neighbour *neigh,
107 						    const struct in6_addr *target);
108 
109 extern int			ndisc_mc_map(struct in6_addr *addr, char *buf, struct net_device *dev, int dir);
110 
111 
112 
113 /*
114  *	IGMP
115  */
116 extern int			igmp6_init(void);
117 
118 extern void			igmp6_cleanup(void);
119 
120 extern int			igmp6_event_query(struct sk_buff *skb);
121 
122 extern int			igmp6_event_report(struct sk_buff *skb);
123 
124 
125 #ifdef CONFIG_SYSCTL
126 extern int 			ndisc_ifinfo_sysctl_change(struct ctl_table *ctl,
127 							   int write,
128 							   struct file * filp,
129 							   void __user *buffer,
130 							   size_t *lenp,
131 							   loff_t *ppos);
132 int ndisc_ifinfo_sysctl_strategy(ctl_table *ctl,
133 				 void __user *oldval, size_t __user *oldlenp,
134 				 void __user *newval, size_t newlen);
135 #endif
136 
137 extern void 			inet6_ifinfo_notify(int event,
138 						    struct inet6_dev *idev);
139 
140 static inline struct neighbour * ndisc_get_neigh(struct net_device *dev, const struct in6_addr *addr)
141 {
142 
143 	if (dev)
144 		return __neigh_lookup(&nd_tbl, addr, dev, 1);
145 
146 	return NULL;
147 }
148 
149 
150 #endif /* __KERNEL__ */
151 
152 
153 #endif
154