patch-2.1.8 linux/include/net/ndisc.h

• Lines: 185
• Date: Thu Nov 7 19:56:49 1996
• Orig file: v2.1.7/linux/include/net/ndisc.h
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v2.1.7/linux/include/net/ndisc.h linux/include/net/ndisc.h
@@ -0,0 +1,184 @@
+#ifndef _NDISC_H
+#define _NDISC_H
+
+
+/*
+ *	Neighbor Cache Entry States (7.3.2.)
+ */
+
+/*
+ *	The lsb is set for states that have a timer associated
+ */
+
+#define NUD_NONE	0x00
+#define NUD_INCOMPLETE	0x11
+#define NUD_REACHABLE	0x20
+#define NUD_STALE	0x30
+#define NUD_DELAY	0x41
+#define NUD_PROBE	0x51
+#define NUD_FAILED	0x60	/* neighbour discovery failed	*/
+
+#define NUD_IN_TIMER	0x01
+
+#define NDISC_QUEUE_LEN	3
+
+#define NCF_NOARP		0x01	/* no ARP needed on this device */
+#define NCF_SUBNET		0x02    /* NC entry for subnet		*/
+#define NCF_INVALID		0x04
+#define NCF_DELAY_EXPIRED	0x08	/* time to move to PROBE	*/
+#define NCF_ROUTER		0x10	/* neighbour is a router	*/
+#define NCF_HHVALID		0x20	/* Hardware header is valid	*/
+
+/*
+ *	ICMP codes for neighbour discovery messages
+ */
+
+#define NDISC_ROUTER_SOLICITATION	133
+#define NDISC_ROUTER_ADVERTISEMENT	134
+#define NDISC_NEIGHBOUR_SOLICITATION	135
+#define NDISC_NEIGHBOUR_ADVERTISEMENT	136
+#define NDISC_REDIRECT			137
+
+/*
+ *	ndisc options
+ */
+
+#define ND_OPT_SOURCE_LL_ADDR		1
+#define ND_OPT_TARGET_LL_ADDR		2
+#define ND_OPT_PREFIX_INFO		3
+#define ND_OPT_REDIRECT_HDR		4
+#define ND_OPT_MTU			5
+
+#define MAX_RTR_SOLICITATION_DELAY	HZ
+
+#define RECHABLE_TIME			(30*HZ)
+#define RETRANS_TIMER			HZ
+
+#define MIN_RANDOM_FACTOR		(1/2)
+#define MAX_RANDOM_FACTOR		(3/2)
+
+#define REACH_RANDOM_INTERVAL		(60*60*HZ)	/* 1 hour */
+
+#ifdef __KERNEL__
+
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include <linux/icmpv6.h>
+#include <asm/atomic.h>
+
+/*
+ *	neighbour cache entry
+ *	used by neighbour discovery module
+ *	as similar functions of "struct hh_cache" used in ipv4
+ */
+struct neighbour {
+	struct in6_addr		addr;		/* next hop addr */
+	__u8			len;		/* prefix len	 */
+	__u8			type;		/* {unicast, multicast} */
+			
+	struct device *		dev;
+
+	__u8			flags;
+
+	
+	__u8			hh_data[MAX_ADDR_LEN];	/* cached hdr	*/
+	__u8			*h_dest;		/* dest addr	*/
+
+	struct sk_buff_head	arp_queue;	/* packets waiting for ND to
+						   finish */
+	atomic_t		refcnt;
+	__u8			nud_state;
+	__u8			probes;
+	__u32			tstamp;		/* last reachable conf	*/
+
+	unsigned long		expires;	/* timer expires at	*/
+
+	struct neighbour	*next; 		/* for hash chaining	*/
+	struct neighbour	*prev; 		/* for hash chaining	*/
+};
+
+struct nd_msg {
+        struct icmpv6hdr icmph;
+        struct in6_addr target;
+        struct {
+                __u8	opt_type;
+                __u8	opt_len;
+                __u8	link_addr[MAX_ADDR_LEN];
+        } opt;
+};
+
+struct ra_msg {
+        struct icmpv6hdr	icmph;
+	__u32			reachable_time;
+	__u32			retrans_timer;
+};
+
+struct ndisc_statistics {
+	__u32	allocs;			/* allocated entries		*/
+	__u32	free_delayed;		/* zombie entries		*/
+	__u32	snt_probes_ucast;	/* ns probes sent (ucast)	*/
+	__u32	snt_probes_mcast;	/* ns probes sent (mcast)	*/
+	__u32	rcv_probes_ucast;	/* ns probes rcv  (ucast)	*/
+	__u32	rcv_probes_mcast;	/* ns probes rcv  (mcast)	*/
+	__u32	rcv_upper_conf;		/* confirmations from upper layers */
+	__u32	res_failed;		/* address resolution failures	*/
+};
+
+extern struct neighbour *	ndisc_get_neigh(struct device *dev, 
+						struct in6_addr *addr);
+
+extern void			ndisc_validate(struct neighbour *neigh);
+
+extern void			ndisc_init(struct proto_ops *ops);
+extern void			ndisc_cleanup(void);
+
+extern int			ndisc_eth_resolv(unsigned char *,
+						 struct device *,
+						 struct sk_buff *);
+
+extern int			ndisc_rcv(struct sk_buff *skb,
+					  struct device *dev,
+					  struct in6_addr *saddr,
+					  struct in6_addr *daddr,
+					  struct ipv6_options *opt,
+					  unsigned short len);
+
+extern void			ndisc_event_send(struct neighbour *neigh,
+						 struct sk_buff *skb);
+
+extern void			ndisc_send_ns(struct device *dev,
+					      struct neighbour *neigh,
+					      struct in6_addr *solicit,
+					      struct in6_addr *daddr,
+					      struct in6_addr *saddr);
+
+extern void			ndisc_send_rs(struct device *dev,
+					      struct in6_addr *saddr,
+					      struct in6_addr *daddr);
+
+extern int			(*ndisc_eth_hook) (unsigned char *,
+						   struct device *,
+						   struct sk_buff *);
+
+extern void			ndisc_forwarding_on(void);
+extern void			ndisc_forwarding_off(void);
+
+extern void			ndisc_send_redirect(struct sk_buff *skb,
+						    struct neighbour *neigh,
+						    struct in6_addr *target);
+
+struct rt6_info *		dflt_rt_lookup(void);
+
+extern unsigned long	nd_rand_seed;
+extern int		ipv6_random(void);
+
+
+static __inline__ void ndisc_dec_neigh(struct neighbour *neigh)
+{
+	atomic_dec(&neigh->refcnt);
+}
+
+#endif /* __KERNEL__ */
+
+
+#endif