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