root/include/net/ndisc.h

INCLUDED FROM

DEFINITIONS

1. ndisc_get_neigh

#ifndef _NDISC_H
#define _NDISC_H

/*
 *      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

/*
 * Router type: cross-layer information from link-layer to
 * IPv6 layer reported by certain link types (e.g., RFC4214).
 */
#define NDISC_NODETYPE_UNSPEC           0       /* unspecified (default) */
#define NDISC_NODETYPE_HOST             1       /* host or unauthorized router */
#define NDISC_NODETYPE_NODEFAULT        2       /* non-default router */
#define NDISC_NODETYPE_DEFAULT          3       /* default router */

/*
 *      ndisc options
 */

enum {
        __ND_OPT_PREFIX_INFO_END = 0,
        ND_OPT_SOURCE_LL_ADDR = 1,      /* RFC2461 */
        ND_OPT_TARGET_LL_ADDR = 2,      /* RFC2461 */
        ND_OPT_PREFIX_INFO = 3,         /* RFC2461 */
        ND_OPT_REDIRECT_HDR = 4,        /* RFC2461 */
        ND_OPT_MTU = 5,                 /* RFC2461 */
        __ND_OPT_ARRAY_MAX,
        ND_OPT_ROUTE_INFO = 24,         /* RFC4191 */
        ND_OPT_RDNSS = 25,              /* RFC5006 */
        __ND_OPT_MAX
};

#define MAX_RTR_SOLICITATION_DELAY      HZ

#define ND_REACHABLE_TIME               (30*HZ)
#define ND_RETRANS_TIMER                HZ

#define ND_MIN_RANDOM_FACTOR            (1/2)
#define ND_MAX_RANDOM_FACTOR            (3/2)

#ifdef __KERNEL__

#include <linux/compiler.h>
#include <linux/icmpv6.h>
#include <linux/in6.h>
#include <linux/types.h>

#include <net/neighbour.h>

struct ctl_table;
struct file;
struct inet6_dev;
struct net_device;
struct net_proto_family;
struct sk_buff;

extern struct neigh_table nd_tbl;

struct nd_msg {
        struct icmp6hdr icmph;
        struct in6_addr target;
        __u8            opt[0];
};

struct rs_msg {
        struct icmp6hdr icmph;
        __u8            opt[0];
};

struct ra_msg {
        struct icmp6hdr         icmph;
        __be32                  reachable_time;
        __be32                  retrans_timer;
};

struct nd_opt_hdr {
        __u8            nd_opt_type;
        __u8            nd_opt_len;
} __attribute__((__packed__));


extern int                      ndisc_init(void);

extern void                     ndisc_cleanup(void);

extern int                      ndisc_rcv(struct sk_buff *skb);

extern void                     ndisc_send_ns(struct net_device *dev,
                                              struct neighbour *neigh,
                                              const struct in6_addr *solicit,
                                              const struct in6_addr *daddr,
                                              const struct in6_addr *saddr);

extern void                     ndisc_send_rs(struct net_device *dev,
                                              const struct in6_addr *saddr,
                                              const struct in6_addr *daddr);

extern void                     ndisc_send_redirect(struct sk_buff *skb,
                                                    struct neighbour *neigh,
                                                    const struct in6_addr *target);

extern int                      ndisc_mc_map(struct in6_addr *addr, char *buf, struct net_device *dev, int dir);



/*
 *      IGMP
 */
extern int                      igmp6_init(void);

extern void                     igmp6_cleanup(void);

extern int                      igmp6_event_query(struct sk_buff *skb);

extern int                      igmp6_event_report(struct sk_buff *skb);


#ifdef CONFIG_SYSCTL
extern int                      ndisc_ifinfo_sysctl_change(struct ctl_table *ctl,
                                                           int write,
                                                           struct file * filp,
                                                           void __user *buffer,
                                                           size_t *lenp,
                                                           loff_t *ppos);
int ndisc_ifinfo_sysctl_strategy(ctl_table *ctl, int __user *name,
                                 int nlen, void __user *oldval,
                                 size_t __user *oldlenp,
                                 void __user *newval, size_t newlen);
#endif

extern void                     inet6_ifinfo_notify(int event,
                                                    struct inet6_dev *idev);

static inline struct neighbour * ndisc_get_neigh(struct net_device *dev, const struct in6_addr *addr)
{

        if (dev)
                return __neigh_lookup(&nd_tbl, addr, dev, 1);

        return NULL;
}


#endif /* __KERNEL__ */


#endif