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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright (C) 2013 Allied Telesis Labs NZ
* Chris Packham, <judge.packham@gmail.com>
*
* Copyright (C) 2022 YADRO
* Viacheslav Mitrofanov <v.v.mitrofanov@yadro.com>
*/
#ifndef __NDISC_H__
#define __NDISC_H__
#include <ndisc.h>
/* struct nd_msg - ICMPv6 Neighbour Discovery message format */
struct nd_msg {
struct icmp6hdr icmph;
struct in6_addr target;
__u8 opt[0];
};
/* struct echo_msg - ICMPv6 echo request/reply message format */
struct echo_msg {
struct icmp6hdr icmph;
__u16 id;
__u16 sequence;
};
/* Neigbour Discovery option types */
enum {
__ND_OPT_PREFIX_INFO_END = 0,
ND_OPT_SOURCE_LL_ADDR = 1,
ND_OPT_TARGET_LL_ADDR = 2,
ND_OPT_PREFIX_INFO = 3,
ND_OPT_REDIRECT_HDR = 4,
ND_OPT_MTU = 5,
__ND_OPT_MAX
};
/* IPv6 destination address of packet waiting for ND */
extern struct in6_addr net_nd_sol_packet_ip6;
/* MAC destination address of packet waiting for ND */
extern uchar *net_nd_packet_mac;
/* pointer to packet waiting to be transmitted after ND is resolved */
extern uchar *net_nd_tx_packet;
/* size of packet waiting to be transmitted */
extern int net_nd_tx_packet_size;
/* the timer for ND resolution */
extern ulong net_nd_timer_start;
/* the number of requests we have sent so far */
extern int net_nd_try;
#ifdef CONFIG_IPV6
/**
* ndisc_init() - Make initial steps for ND state machine.
* Usually move variables into initial state.
*/
void ndisc_init(void);
/**
* ndisc_receive() - Handle ND packet
*
* @et: pointer to incoming packet
* @ip6: pointer to IPv6 header
* @len: incoming packet length
* Return: 0 if handle successfully, -1 if unsupported/unknown ND packet type
*/
int ndisc_receive(struct ethernet_hdr *et, struct ip6_hdr *ip6, int len);
/**
* ndisc_request() - Send ND request
*/
void ndisc_request(void);
/**
* ndisc_init() - Check ND response timeout
*
* Return: 0 if no timeout, -1 otherwise
*/
int ndisc_timeout_check(void);
#else
static inline void ndisc_init(void)
{
}
static inline int
ndisc_receive(struct ethernet_hdr *et, struct ip6_hdr *ip6, int len)
{
return -1;
}
static inline void ndisc_request(void)
{
}
static inline int ndisc_timeout_check(void)
{
return 0;
}
#endif
#endif /* __NDISC_H__ */
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