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