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Viacheslav Mitrofanovc6610e12022-12-02 12:18:01 +03001/* 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
Ehsan Mohandesi6de98b62023-04-21 17:08:21 -070022/* 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
Viacheslav Mitrofanovc6610e12022-12-02 12:18:01 +030036/* 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
Ehsan Mohandesi6de98b62023-04-21 17:08:21 -070074/*
75 * ip6_send_rs() - Send IPv6 Router Solicitation Message
76 */
77void ip6_send_rs(void);
78
Viacheslav Mitrofanovc6610e12022-12-02 12:18:01 +030079/**
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);
Ehsan Mohandesi6de98b62023-04-21 17:08:21 -0700100bool validate_ra(struct ip6_hdr *ip6);
101int process_ra(struct ip6_hdr *ip6, int len);
Viacheslav Mitrofanovc6610e12022-12-02 12:18:01 +0300102#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}
Ehsan Mohandesi6de98b62023-04-21 17:08:21 -0700121
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}
Viacheslav Mitrofanovc6610e12022-12-02 12:18:01 +0300135#endif
136
137#endif /* __NDISC_H__ */