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#ifndef _IPXE_NDP_H
#define _IPXE_NDP_H
/** @file
*
* Neighbour discovery protocol
*
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <stdint.h>
#include <ipxe/in.h>
#include <ipxe/ipv6.h>
#include <ipxe/icmpv6.h>
#include <ipxe/neighbour.h>
/** An NDP option header */
struct ndp_option_header {
/** Type */
uint8_t type;
/** Length (in blocks of 8 bytes) */
uint8_t blocks;
} __attribute__ (( packed ));
/** NDP option block size */
#define NDP_OPTION_BLKSZ 8U
/** NDP source link-layer address option */
#define NDP_OPT_LL_SOURCE 1
/** NDP target link-layer address option */
#define NDP_OPT_LL_TARGET 2
/** NDP source or target link-layer address option */
struct ndp_ll_addr_option {
/** NDP option header */
struct ndp_option_header header;
/** Link-layer address */
uint8_t ll_addr[0];
} __attribute__ (( packed ));
/** NDP prefix information option */
#define NDP_OPT_PREFIX 3
/** NDP prefix information */
struct ndp_prefix_information_option {
/** NDP option header */
struct ndp_option_header header;
/** Prefix length */
uint8_t prefix_len;
/** Flags */
uint8_t flags;
/** Valid lifetime */
uint32_t valid;
/** Preferred lifetime */
uint32_t preferred;
/** Reserved */
uint32_t reserved;
/** Prefix */
struct in6_addr prefix;
} __attribute__ (( packed ));
/** NDP on-link flag */
#define NDP_PREFIX_ON_LINK 0x80
/** NDP autonomous address configuration flag */
#define NDP_PREFIX_AUTONOMOUS 0x40
/** NDP recursive DNS server option */
#define NDP_OPT_RDNSS 25
/** NDP recursive DNS server */
struct ndp_rdnss_option {
/** NDP option header */
struct ndp_option_header header;
/** Reserved */
uint16_t reserved;
/** Lifetime */
uint32_t lifetime;
/** Addresses */
struct in6_addr addresses[0];
} __attribute__ (( packed ));
/** NDP DNS search list option */
#define NDP_OPT_DNSSL 31
/** NDP DNS search list */
struct ndp_dnssl_option {
/** NDP option header */
struct ndp_option_header header;
/** Reserved */
uint16_t reserved;
/** Lifetime */
uint32_t lifetime;
/** Domain names */
uint8_t names[0];
} __attribute__ (( packed ));
/** An NDP option */
union ndp_option {
/** Option header */
struct ndp_option_header header;
/** Source or target link-layer address option */
struct ndp_ll_addr_option ll_addr;
/** Prefix information option */
struct ndp_prefix_information_option prefix;
/** Recursive DNS server option */
struct ndp_rdnss_option rdnss;
/** DNS search list option */
struct ndp_dnssl_option dnssl;
} __attribute__ (( packed ));
/** An NDP neighbour solicitation or advertisement header */
struct ndp_neighbour_header {
/** ICMPv6 header */
struct icmp_header icmp;
/** Flags */
uint8_t flags;
/** Reserved */
uint8_t reserved[3];
/** Target address */
struct in6_addr target;
/** Options */
union ndp_option option[0];
} __attribute__ (( packed ));
/** NDP router flag */
#define NDP_NEIGHBOUR_ROUTER 0x80
/** NDP solicited flag */
#define NDP_NEIGHBOUR_SOLICITED 0x40
/** NDP override flag */
#define NDP_NEIGHBOUR_OVERRIDE 0x20
/** An NDP router advertisement header */
struct ndp_router_advertisement_header {
/** ICMPv6 header */
struct icmp_header icmp;
/** Current hop limit */
uint8_t hop_limit;
/** Flags */
uint8_t flags;
/** Router lifetime */
uint16_t lifetime;
/** Reachable time */
uint32_t reachable;
/** Retransmission timer */
uint32_t retransmit;
/** Options */
union ndp_option option[0];
} __attribute__ (( packed ));
/** NDP managed address configuration */
#define NDP_ROUTER_MANAGED 0x80
/** NDP other configuration */
#define NDP_ROUTER_OTHER 0x40
/** An NDP router solicitation header */
struct ndp_router_solicitation_header {
/** ICMPv6 header */
struct icmp_header icmp;
/** Reserved */
uint32_t reserved;
/** Options */
union ndp_option option[0];
} __attribute__ (( packed ));
/** An NDP header */
union ndp_header {
/** ICMPv6 header */
struct icmp_header icmp;
/** Neighbour solicitation or advertisement header */
struct ndp_neighbour_header neigh;
/** Router solicitation header */
struct ndp_router_solicitation_header rsol;
/** Router advertisement header */
struct ndp_router_advertisement_header radv;
} __attribute__ (( packed ));
extern struct neighbour_discovery ndp_discovery;
/**
* Transmit packet, determining link-layer address via NDP
*
* @v iobuf I/O buffer
* @v netdev Network device
* @v net_dest Destination network-layer address
* @v net_source Source network-layer address
* @v ll_source Source link-layer address
* @ret rc Return status code
*/
static inline int ndp_tx ( struct io_buffer *iobuf, struct net_device *netdev,
const void *net_dest, const void *net_source,
const void *ll_source ) {
return neighbour_tx ( iobuf, netdev, &ipv6_protocol, net_dest,
&ndp_discovery, net_source, ll_source );
}
/** NDP settings block name */
#define NDP_SETTINGS_NAME "ndp"
#endif /* _IPXE_NDP_H */
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