include/net/ndisc.h

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This source file includes following definitions.
ndisc_addr_option_pad
ndisc_opt_addr_space
ndisc_opt_addr_data
ndisc_hashfn
__ipv6_neigh_lookup_noref
__ipv6_neigh_lookup
#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_DNSSL = 31,              /* RFC6106 */
        __ND_OPT_MAX
};

#define MAX_RTR_SOLICITATION_DELAY      HZ

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

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

#include <net/neighbour.h>

struct ctl_table;
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 rd_msg {
        struct icmp6hdr icmph;
        struct in6_addr target;
        struct in6_addr dest;
        __u8            opt[0];
};

struct nd_opt_hdr {
        __u8            nd_opt_type;
        __u8            nd_opt_len;
} __packed;

/* ND options */
struct ndisc_options {
        struct nd_opt_hdr *nd_opt_array[__ND_OPT_ARRAY_MAX];
#ifdef CONFIG_IPV6_ROUTE_INFO
        struct nd_opt_hdr *nd_opts_ri;
        struct nd_opt_hdr *nd_opts_ri_end;
#endif
        struct nd_opt_hdr *nd_useropts;
        struct nd_opt_hdr *nd_useropts_end;
};

#define nd_opts_src_lladdr      nd_opt_array[ND_OPT_SOURCE_LL_ADDR]
#define nd_opts_tgt_lladdr      nd_opt_array[ND_OPT_TARGET_LL_ADDR]
#define nd_opts_pi              nd_opt_array[ND_OPT_PREFIX_INFO]
#define nd_opts_pi_end          nd_opt_array[__ND_OPT_PREFIX_INFO_END]
#define nd_opts_rh              nd_opt_array[ND_OPT_REDIRECT_HDR]
#define nd_opts_mtu             nd_opt_array[ND_OPT_MTU]

#define NDISC_OPT_SPACE(len) (((len)+2+7)&~7)

struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len,
                                          struct ndisc_options *ndopts);

/*
 * Return the padding between the option length and the start of the
 * link addr.  Currently only IP-over-InfiniBand needs this, although
 * if RFC 3831 IPv6-over-Fibre Channel is ever implemented it may
 * also need a pad of 2.
 */
static inline int ndisc_addr_option_pad(unsigned short type)
{
        switch (type) {
        case ARPHRD_INFINIBAND: return 2;
        default:                return 0;
        }
}

static inline int ndisc_opt_addr_space(struct net_device *dev)
{
        return NDISC_OPT_SPACE(dev->addr_len +
                               ndisc_addr_option_pad(dev->type));
}

static inline u8 *ndisc_opt_addr_data(struct nd_opt_hdr *p,
                                      struct net_device *dev)
{
        u8 *lladdr = (u8 *)(p + 1);
        int lladdrlen = p->nd_opt_len << 3;
        int prepad = ndisc_addr_option_pad(dev->type);
        if (lladdrlen != ndisc_opt_addr_space(dev))
                return NULL;
        return lladdr + prepad;
}

static inline u32 ndisc_hashfn(const void *pkey, const struct net_device *dev, __u32 *hash_rnd)
{
        const u32 *p32 = pkey;

        return (((p32[0] ^ hash32_ptr(dev)) * hash_rnd[0]) +
                (p32[1] * hash_rnd[1]) +
                (p32[2] * hash_rnd[2]) +
                (p32[3] * hash_rnd[3]));
}

static inline struct neighbour *__ipv6_neigh_lookup_noref(struct net_device *dev, const void *pkey)
{
        struct neigh_hash_table *nht;
        const u32 *p32 = pkey;
        struct neighbour *n;
        u32 hash_val;

        nht = rcu_dereference_bh(nd_tbl.nht);
        hash_val = ndisc_hashfn(pkey, dev, nht->hash_rnd) >> (32 - nht->hash_shift);
        for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]);
             n != NULL;
             n = rcu_dereference_bh(n->next)) {
                u32 *n32 = (u32 *) n->primary_key;
                if (n->dev == dev &&
                    ((n32[0] ^ p32[0]) | (n32[1] ^ p32[1]) |
                     (n32[2] ^ p32[2]) | (n32[3] ^ p32[3])) == 0)
                        return n;
        }

        return NULL;
}

static inline struct neighbour *__ipv6_neigh_lookup(struct net_device *dev, const void *pkey)
{
        struct neighbour *n;

        rcu_read_lock_bh();
        n = __ipv6_neigh_lookup_noref(dev, pkey);
        if (n && !atomic_inc_not_zero(&n->refcnt))
                n = NULL;
        rcu_read_unlock_bh();

        return n;
}

int ndisc_init(void);
int ndisc_late_init(void);

void ndisc_late_cleanup(void);
void ndisc_cleanup(void);

int ndisc_rcv(struct sk_buff *skb);

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);

void ndisc_send_rs(struct net_device *dev,
                   const struct in6_addr *saddr, const struct in6_addr *daddr);
void ndisc_send_na(struct net_device *dev, struct neighbour *neigh,
                   const struct in6_addr *daddr,
                   const struct in6_addr *solicited_addr,
                   bool router, bool solicited, bool override, bool inc_opt);

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

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


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

void igmp6_cleanup(void);

int igmp6_event_query(struct sk_buff *skb);

int igmp6_event_report(struct sk_buff *skb);


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

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

#endif
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root/include/net/ndisc.h

INCLUDED FROM

DEFINITIONS
