1/* SPDX-License-Identifier: GPL-2.0+ */
2/*
3 * Copyright (C) 2013 Allied Telesis Labs NZ
4 * Chris Packham, <judge.packham@gmail.com>
5 *
6 * Copyright (C) 2022 YADRO
7 * Viacheslav Mitrofanov <v.v.mitrofanov@yadro.com>
8 */
9
10#ifndef __NDISC_H__
11#define __NDISC_H__
12
13#include <ndisc.h>
14
15/* struct nd_msg - ICMPv6 Neighbour Discovery message format */
16struct nd_msg {
17	struct icmp6hdr	icmph;
18	struct in6_addr	target;
19	__u8		opt[0];
20};
21
22/* struct rs_msg - ICMPv6 Router Solicitation message format */
23struct rs_msg {
24	struct icmp6hdr	icmph;
25	__u8		opt[0];
26};
27
28/* struct ra_msg - ICMPv6 Router Advertisement message format */
29struct ra_msg {
30	struct icmp6hdr	icmph;
31	__u32	reachable_time;
32	__u32	retransmission_timer;
33	__u8	opt[0];
34};
35
36/* struct echo_msg - ICMPv6 echo request/reply message format */
37struct echo_msg {
38	struct icmp6hdr	icmph;
39	__u16		id;
40	__u16		sequence;
41};
42
43/* Neigbour Discovery option types */
44enum {
45	__ND_OPT_PREFIX_INFO_END	= 0,
46	ND_OPT_SOURCE_LL_ADDR		= 1,
47	ND_OPT_TARGET_LL_ADDR		= 2,
48	ND_OPT_PREFIX_INFO		= 3,
49	ND_OPT_REDIRECT_HDR		= 4,
50	ND_OPT_MTU			= 5,
51	__ND_OPT_MAX
52};
53
54/* IPv6 destination address of packet waiting for ND */
55extern struct in6_addr net_nd_sol_packet_ip6;
56/* MAC destination address of packet waiting for ND */
57extern uchar *net_nd_packet_mac;
58/* pointer to packet waiting to be transmitted after ND is resolved */
59extern uchar *net_nd_tx_packet;
60/* size of packet waiting to be transmitted */
61extern int net_nd_tx_packet_size;
62/* the timer for ND resolution */
63extern ulong net_nd_timer_start;
64/* the number of requests we have sent so far */
65extern int net_nd_try;
66
67#ifdef CONFIG_IPV6
68/**
69 * ndisc_init() - Make initial steps for ND state machine.
70 * Usually move variables into initial state.
71 */
72void ndisc_init(void);
73
74/*
75 * ip6_send_rs() - Send IPv6 Router Solicitation Message
76 */
77void ip6_send_rs(void);
78
79/**
80 * ndisc_receive() - Handle ND packet
81 *
82 * @et:		pointer to incoming packet
83 * @ip6:	pointer to IPv6 header
84 * @len:	incoming packet length
85 * Return: 0 if handle successfully, -1 if unsupported/unknown ND packet type
86 */
87int ndisc_receive(struct ethernet_hdr *et, struct ip6_hdr *ip6, int len);
88
89/**
90 * ndisc_request() - Send ND request
91 */
92void ndisc_request(void);
93
94/**
95 * ndisc_init() - Check ND response timeout
96 *
97 * Return: 0 if no timeout, -1 otherwise
98 */
99int ndisc_timeout_check(void);
100bool validate_ra(struct ip6_hdr *ip6);
101int process_ra(struct ip6_hdr *ip6, int len);
102#else
103static inline void ndisc_init(void)
104{
105}
106
107static inline int
108ndisc_receive(struct ethernet_hdr *et, struct ip6_hdr *ip6, int len)
109{
110	return -1;
111}
112
113static inline void ndisc_request(void)
114{
115}
116
117static inline int ndisc_timeout_check(void)
118{
119	return 0;
120}
121
122static inline void ip6_send_rs(void)
123{
124}
125
126static inline bool validate_ra(struct ip6_hdr *ip6)
127{
128	return true;
129}
130
131static inline int process_ra(struct ip6_hdr *ip6, int len)
132{
133	return 0;
134}
135#endif
136
137#endif /* __NDISC_H__ */
138