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 #include <linux/compiler.h>
46 #include <linux/icmpv6.h>
47 #include <linux/in6.h>
48 #include <linux/types.h>
49 
50 #include <net/neighbour.h>
51 
52 struct ctl_table;
53 struct inet6_dev;
54 struct net_device;
55 struct net_proto_family;
56 struct sk_buff;
57 
58 extern struct neigh_table nd_tbl;
59 
60 struct nd_msg {
61         struct icmp6hdr	icmph;
62         struct in6_addr	target;
63 	__u8		opt[0];
64 };
65 
66 struct rs_msg {
67 	struct icmp6hdr	icmph;
68 	__u8		opt[0];
69 };
70 
71 struct ra_msg {
72         struct icmp6hdr		icmph;
73 	__be32			reachable_time;
74 	__be32			retrans_timer;
75 };
76 
77 struct nd_opt_hdr {
78 	__u8		nd_opt_type;
79 	__u8		nd_opt_len;
80 } __packed;
81 
ndisc_hashfn(const void * pkey,const struct net_device * dev,__u32 * hash_rnd)82 static inline u32 ndisc_hashfn(const void *pkey, const struct net_device *dev, __u32 *hash_rnd)
83 {
84 	const u32 *p32 = pkey;
85 
86 	return (((p32[0] ^ dev->ifindex) * hash_rnd[0]) +
87 		(p32[1] * hash_rnd[1]) +
88 		(p32[2] * hash_rnd[2]) +
89 		(p32[3] * hash_rnd[3]));
90 }
91 
__ipv6_neigh_lookup(struct neigh_table * tbl,struct net_device * dev,const void * pkey)92 static inline struct neighbour *__ipv6_neigh_lookup(struct neigh_table *tbl, struct net_device *dev, const void *pkey)
93 {
94 	struct neigh_hash_table *nht;
95 	const u32 *p32 = pkey;
96 	struct neighbour *n;
97 	u32 hash_val;
98 
99 	rcu_read_lock_bh();
100 	nht = rcu_dereference_bh(tbl->nht);
101 	hash_val = ndisc_hashfn(pkey, dev, nht->hash_rnd) >> (32 - nht->hash_shift);
102 	for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]);
103 	     n != NULL;
104 	     n = rcu_dereference_bh(n->next)) {
105 		u32 *n32 = (u32 *) n->primary_key;
106 		if (n->dev == dev &&
107 		    ((n32[0] ^ p32[0]) | (n32[1] ^ p32[1]) |
108 		     (n32[2] ^ p32[2]) | (n32[3] ^ p32[3])) == 0) {
109 			if (!atomic_inc_not_zero(&n->refcnt))
110 				n = NULL;
111 			break;
112 		}
113 	}
114 	rcu_read_unlock_bh();
115 
116 	return n;
117 }
118 
119 extern int			ndisc_init(void);
120 
121 extern void			ndisc_cleanup(void);
122 
123 extern int			ndisc_rcv(struct sk_buff *skb);
124 
125 extern void			ndisc_send_ns(struct net_device *dev,
126 					      struct neighbour *neigh,
127 					      const struct in6_addr *solicit,
128 					      const struct in6_addr *daddr,
129 					      const struct in6_addr *saddr);
130 
131 extern void			ndisc_send_rs(struct net_device *dev,
132 					      const struct in6_addr *saddr,
133 					      const struct in6_addr *daddr);
134 
135 extern void			ndisc_send_redirect(struct sk_buff *skb,
136 						    const struct in6_addr *target);
137 
138 extern int			ndisc_mc_map(const struct in6_addr *addr, char *buf,
139 					     struct net_device *dev, int dir);
140 
141 extern struct sk_buff		*ndisc_build_skb(struct net_device *dev,
142 						 const struct in6_addr *daddr,
143 						 const struct in6_addr *saddr,
144 						 struct icmp6hdr *icmp6h,
145 						 const struct in6_addr *target,
146 						 int llinfo);
147 
148 extern void			ndisc_send_skb(struct sk_buff *skb,
149 					       struct net_device *dev,
150 					       struct neighbour *neigh,
151 					       const struct in6_addr *daddr,
152 					       const struct in6_addr *saddr,
153 					       struct icmp6hdr *icmp6h);
154 
155 
156 
157 /*
158  *	IGMP
159  */
160 extern int			igmp6_init(void);
161 
162 extern void			igmp6_cleanup(void);
163 
164 extern int			igmp6_event_query(struct sk_buff *skb);
165 
166 extern int			igmp6_event_report(struct sk_buff *skb);
167 
168 
169 #ifdef CONFIG_SYSCTL
170 extern int 			ndisc_ifinfo_sysctl_change(struct ctl_table *ctl,
171 							   int write,
172 							   void __user *buffer,
173 							   size_t *lenp,
174 							   loff_t *ppos);
175 int ndisc_ifinfo_sysctl_strategy(ctl_table *ctl,
176 				 void __user *oldval, size_t __user *oldlenp,
177 				 void __user *newval, size_t newlen);
178 #endif
179 
180 extern void 			inet6_ifinfo_notify(int event,
181 						    struct inet6_dev *idev);
182 
183 #endif
184