include/ndisc.h

   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
 103 static inline void ndisc_init(void)
 104 {
 105 }
 106
 107 static inline int
 108 ndisc_receive(struct ethernet_hdr *et, struct ip6_hdr *ip6, int len)
 109 {
 110         return -1;
 111 }
 112
 113 static inline void ndisc_request(void)
 114 {
 115 }
 116
 117 static inline int ndisc_timeout_check(void)
 118 {
 119         return 0;
 120 }
 121
 122 static inline void ip6_send_rs(void)
 123 {
 124 }
 125
 126 static inline bool validate_ra(struct ip6_hdr *ip6)
 127 {
 128         return true;
 129 }
 130
 131 static inline int process_ra(struct ip6_hdr *ip6, int len)
 132 {
 133         return 0;
 134 }
 135 #endif
 136
 137 #endif /* __NDISC_H__ */