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      +ˆl–ßi~”Je¶…8 q¦î	•1hßÍ0ÄË  $   -ˆÉÍ„adÈa–Ým_J*j"Tâ€À¹q·TÅ£Ì ;    -/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _NDISC_H
#define _NDISC_H

#include <net/ipv6_stubs.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_NONCE = 14,              /* RFC7527 */
	__ND_OPT_ARRAY_MAX,
	ND_OPT_ROUTE_INFO = 24,		/* RFC4191 */
	ND_OPT_RDNSS = 25,		/* RFC5006 */
	ND_OPT_DNSSL = 31,		/* RFC6106 */
	ND_OPT_6CO = 34,		/* RFC6775 */
	ND_OPT_CAPTIVE_PORTAL = 37,	/* RFC7710 */
	ND_OPT_PREF64 = 38,		/* RFC8781 */
	__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>

/* Set to 3 to get tracing... */
#define ND_DEBUG 1

#define ND_PRINTK(val, level, fmt, ...)				\
do {								\
	if (val <= ND_DEBUG)					\
		net_##level##_ratelimited(fmt, ##__VA_ARGS__);	\
} while (0)

struct ctl_table;
struct inet6_dev;
struct net_device;
struct net_proto_family;
struct sk_buff;
struct prefix_info;

extern struct neigh_table nd_tbl;

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

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

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[];
};

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;
#if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
	struct nd_opt_hdr *nd_802154_opt_array[ND_OPT_TARGET_LL_ADDR + 1];
#endif
};

#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 nd_opts_nonce			nd_opt_array[ND_OPT_NONCE]
#define nd_802154_opts_src_lladdr	nd_802154_opt_array[ND_OPT_SOURCE_LL_ADDR]
#define nd_802154_opts_tgt_lladdr	nd_802154_opt_array[ND_OPT_TARGET_LL_ADDR]

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

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

void __ndisc_fill_addr_option(struct sk_buff *skb, int type, void *data,
			      int data_len, int pad);

#define NDISC_OPS_REDIRECT_DATA_SPACE	2

/*
 * This structure defines the hooks for IPv6 neighbour discovery.
 * The following hooks can be defined; unless noted otherwise, they are
 * optional and can be filled with a null pointer.
 *
 * int (*is_useropt)(u8 nd_opt_type):
 *     This function is called when IPv6 decide RA userspace options. if
 *     this function r