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src/include/ipxe/ndp.h
220 строк
5 KB
Christian I. Nilsson
[ipv6] Obtain MTU setting from NDP
24 фев 2026, 02:38
24 фев 2026, 02:38
1b6d88d
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#ifndef _IPXE_NDP_H #define _IPXE_NDP_H /** @file * * Neighbour discovery protocol * */ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); FILE_SECBOOT ( PERMITTED ); #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 MTU option */ #define NDP_OPT_MTU 5 /** NDP MTU */ struct ndp_mtu_option { /** NDP option header */ struct ndp_option_header header; /** Reserved */ uint16_t reserved; /** MTU */ uint32_t mtu; } __attribute__ (( packed )); /** 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; /** MTU option */ struct ndp_mtu_option mtu; /** 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 * @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 ) { return neighbour_tx ( iobuf, netdev, &ipv6_protocol, net_dest, &ndp_discovery, net_source ); } /** NDP settings block name */ #define NDP_SETTINGS_NAME "ndp" #endif /* _IPXE_NDP_H */