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 */
16 struct 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 */
23 struct rs_msg {
24 struct icmp6hdr icmph;
25 __u8 opt[0];
26 };
27
28 /* struct ra_msg - ICMPv6 Router Advertisement message format */
29 struct 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 */
37 struct echo_msg {
38 struct icmp6hdr icmph;
39 __u16 id;
40 __u16 sequence;
41 };
42
43 /* Neigbour Discovery option types */
44 enum {
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 */
55 extern struct in6_addr net_nd_sol_packet_ip6;
56 /* MAC destination address of packet waiting for ND */
57 extern uchar *net_nd_packet_mac;
58 /* pointer to packet waiting to be transmitted after ND is resolved */
59 extern uchar *net_nd_tx_packet;
60 /* size of packet waiting to be transmitted */
61 extern int net_nd_tx_packet_size;
62 /* the timer for ND resolution */
63 extern ulong net_nd_timer_start;
64 /* the number of requests we have sent so far */
65 extern 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 */
72 void ndisc_init(void);
73
74 /*
75 * ip6_send_rs() - Send IPv6 Router Solicitation Message
76 */
77 void 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 */
87 int ndisc_receive(struct ethernet_hdr *et, struct ip6_hdr *ip6, int len);
88
89 /**
90 * ndisc_request() - Send ND request
91 */
92 void ndisc_request(void);
93
94 /**
95 * ndisc_init() - Check ND response timeout
96 *
97 * Return: 0 if no timeout, -1 otherwise
98 */
99 int ndisc_timeout_check(void);
100 bool validate_ra(struct ip6_hdr *ip6);
101 int process_ra(struct ip6_hdr *ip6, int len);
102 #else
ndisc_init(void)103 static inline void ndisc_init(void)
104 {
105 }
106
107 static inline int
ndisc_receive(struct ethernet_hdr * et,struct ip6_hdr * ip6,int len)108 ndisc_receive(struct ethernet_hdr *et, struct ip6_hdr *ip6, int len)
109 {
110 return -1;
111 }
112
ndisc_request(void)113 static inline void ndisc_request(void)
114 {
115 }
116
ndisc_timeout_check(void)117 static inline int ndisc_timeout_check(void)
118 {
119 return 0;
120 }
121
ip6_send_rs(void)122 static inline void ip6_send_rs(void)
123 {
124 }
125
validate_ra(struct ip6_hdr * ip6)126 static inline bool validate_ra(struct ip6_hdr *ip6)
127 {
128 return true;
129 }
130
process_ra(struct ip6_hdr * ip6,int len)131 static inline int process_ra(struct ip6_hdr *ip6, int len)
132 {
133 return 0;
134 }
135 #endif
136
137 #endif /* __NDISC_H__ */
138