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In IPv6, the default gateway and prefix length are determined by receiving a router advertisement as defined in - https://www.rfc-editor.org/rfc/rfc4861. Add support for sending router solicitation (RS) and processing router advertisements (RA). If the RA has prefix info option and following conditions are met, then gatewayip6 and net_prefix_length of ip6addr env variables are initialized. These are later consumed by IPv6 code for non-local destination IP. - "Router Lifetime" != 0 - Prefix is NOT link-local prefix (0xfe80::/10) - L flag is 1 - "Valid Lifetime" != 0 Timing Parameters: - MAX_RTR_SOLICITATION_DELAY (0-1s) - RTR_SOLICITATION_INTERVAL (4s) (min retransmit delay) - MAX_RTR_SOLICITATIONS (3 RS transmissions) The functionality is enabled by CONFIG_IPV6_ROUTER_DISCOVERY and invoked automatically from net_init_loop(). Signed-off-by: Ehsan Mohandesi <emohandesi@linux.microsoft.com> Tested-by: Viacheslav Mitrofanov <v.v.mitrofanov@yadro.com>Reviewed-by: Tested-by: Viacheslav Mitrofanov <v.v.mitrofanov@yadro.com> Reviewed-by: Viacheslav Mitrofanov <v.v.mitrofanov@yadro.com> Tested-by: Sergei Antonov <saproj@gmail.com> Reviewed-by: Sergei Antonov <saproj@gmail.com>
137 lines
2.8 KiB
C
137 lines
2.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright (C) 2013 Allied Telesis Labs NZ
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* Chris Packham, <judge.packham@gmail.com>
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*
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* Copyright (C) 2022 YADRO
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* Viacheslav Mitrofanov <v.v.mitrofanov@yadro.com>
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*/
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#ifndef __NDISC_H__
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#define __NDISC_H__
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#include <ndisc.h>
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/* struct nd_msg - ICMPv6 Neighbour Discovery message format */
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struct nd_msg {
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struct icmp6hdr icmph;
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struct in6_addr target;
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__u8 opt[0];
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};
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/* struct rs_msg - ICMPv6 Router Solicitation message format */
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struct rs_msg {
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struct icmp6hdr icmph;
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__u8 opt[0];
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};
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/* struct ra_msg - ICMPv6 Router Advertisement message format */
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struct ra_msg {
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struct icmp6hdr icmph;
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__u32 reachable_time;
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__u32 retransmission_timer;
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__u8 opt[0];
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};
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/* struct echo_msg - ICMPv6 echo request/reply message format */
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struct echo_msg {
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struct icmp6hdr icmph;
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__u16 id;
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__u16 sequence;
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};
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/* Neigbour Discovery option types */
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enum {
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__ND_OPT_PREFIX_INFO_END = 0,
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ND_OPT_SOURCE_LL_ADDR = 1,
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ND_OPT_TARGET_LL_ADDR = 2,
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ND_OPT_PREFIX_INFO = 3,
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ND_OPT_REDIRECT_HDR = 4,
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ND_OPT_MTU = 5,
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__ND_OPT_MAX
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};
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/* IPv6 destination address of packet waiting for ND */
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extern struct in6_addr net_nd_sol_packet_ip6;
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/* MAC destination address of packet waiting for ND */
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extern uchar *net_nd_packet_mac;
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/* pointer to packet waiting to be transmitted after ND is resolved */
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extern uchar *net_nd_tx_packet;
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/* size of packet waiting to be transmitted */
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extern int net_nd_tx_packet_size;
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/* the timer for ND resolution */
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extern ulong net_nd_timer_start;
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/* the number of requests we have sent so far */
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extern int net_nd_try;
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#ifdef CONFIG_IPV6
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/**
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* ndisc_init() - Make initial steps for ND state machine.
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* Usually move variables into initial state.
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*/
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void ndisc_init(void);
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/*
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* ip6_send_rs() - Send IPv6 Router Solicitation Message
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*/
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void ip6_send_rs(void);
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/**
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* ndisc_receive() - Handle ND packet
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*
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* @et: pointer to incoming packet
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* @ip6: pointer to IPv6 header
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* @len: incoming packet length
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* Return: 0 if handle successfully, -1 if unsupported/unknown ND packet type
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*/
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int ndisc_receive(struct ethernet_hdr *et, struct ip6_hdr *ip6, int len);
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/**
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* ndisc_request() - Send ND request
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*/
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void ndisc_request(void);
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/**
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* ndisc_init() - Check ND response timeout
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*
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* Return: 0 if no timeout, -1 otherwise
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*/
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int ndisc_timeout_check(void);
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bool validate_ra(struct ip6_hdr *ip6);
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int process_ra(struct ip6_hdr *ip6, int len);
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#else
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static inline void ndisc_init(void)
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{
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}
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static inline int
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ndisc_receive(struct ethernet_hdr *et, struct ip6_hdr *ip6, int len)
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{
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return -1;
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}
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static inline void ndisc_request(void)
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{
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}
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static inline int ndisc_timeout_check(void)
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{
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return 0;
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}
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static inline void ip6_send_rs(void)
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{
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}
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static inline bool validate_ra(struct ip6_hdr *ip6)
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{
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return true;
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}
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static inline int process_ra(struct ip6_hdr *ip6, int len)
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{
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return 0;
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}
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#endif
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#endif /* __NDISC_H__ */
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