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Diffstat (limited to 'src/include/ipxe/ipv6.h')
| -rw-r--r-- | src/include/ipxe/ipv6.h | 218 |
1 files changed, 218 insertions, 0 deletions
diff --git a/src/include/ipxe/ipv6.h b/src/include/ipxe/ipv6.h new file mode 100644 index 0000000..f404ba6 --- /dev/null +++ b/src/include/ipxe/ipv6.h @@ -0,0 +1,218 @@ +#ifndef _IPXE_IPV6_H +#define _IPXE_IPV6_H + +/** @file + * + * IPv6 protocol + * + */ + +FILE_LICENCE ( GPL2_OR_LATER ); + +#include <stdint.h> +#include <string.h> +#include <byteswap.h> +#include <ipxe/in.h> +#include <ipxe/list.h> +#include <ipxe/netdevice.h> + +/** IPv6 version */ +#define IPV6_VER 0x60000000UL + +/** IPv6 version mask */ +#define IPV6_MASK_VER 0xf0000000UL + +/** IPv6 maximum hop limit */ +#define IPV6_HOP_LIMIT 0xff + +/** IPv6 header */ +struct ipv6_header { + /** Version (4 bits), Traffic class (8 bits), Flow label (20 bits) */ + uint32_t ver_tc_label; + /** Payload length, including any extension headers */ + uint16_t len; + /** Next header type */ + uint8_t next_header; + /** Hop limit */ + uint8_t hop_limit; + /** Source address */ + struct in6_addr src; + /** Destination address */ + struct in6_addr dest; +} __attribute__ (( packed )); + +/** IPv6 extension header common fields */ +struct ipv6_extension_header_common { + /** Next header type */ + uint8_t next_header; + /** Header extension length (excluding first 8 bytes) */ + uint8_t len; +} __attribute__ (( packed )); + +/** IPv6 type-length-value options */ +struct ipv6_option { + /** Type */ + uint8_t type; + /** Length */ + uint8_t len; + /** Value */ + uint8_t value[0]; +} __attribute__ (( packed )); + +/** IPv6 option types */ +enum ipv6_option_type { + /** Pad1 */ + IPV6_OPT_PAD1 = 0x00, + /** PadN */ + IPV6_OPT_PADN = 0x01, +}; + +/** Test if IPv6 option can be safely ignored */ +#define IPV6_CAN_IGNORE_OPT( type ) ( ( (type) & 0xc0 ) == 0x00 ) + +/** IPv6 option-based extension header */ +struct ipv6_options_header { + /** Extension header common fields */ + struct ipv6_extension_header_common common; + /** Options */ + struct ipv6_option options[0]; +} __attribute__ (( packed )); + +/** IPv6 routing header */ +struct ipv6_routing_header { + /** Extension header common fields */ + struct ipv6_extension_header_common common; + /** Routing type */ + uint8_t type; + /** Segments left */ + uint8_t remaining; + /** Type-specific data */ + uint8_t data[0]; +} __attribute__ (( packed )); + +/** IPv6 fragment header */ +struct ipv6_fragment_header { + /** Extension header common fields */ + struct ipv6_extension_header_common common; + /** Fragment offset (13 bits), reserved, more fragments (1 bit) */ + uint16_t offset_more; + /** Identification */ + uint32_t ident; +} __attribute__ (( packed )); + +/** Fragment offset mask */ +#define IPV6_MASK_OFFSET 0xfff8 + +/** More fragments */ +#define IPV6_MASK_MOREFRAGS 0x0001 + +/** IPv6 extension header */ +union ipv6_extension_header { + /** Extension header common fields */ + struct ipv6_extension_header_common common; + /** Minimum size padding */ + uint8_t pad[8]; + /** Generic options header */ + struct ipv6_options_header options; + /** Hop-by-hop options header */ + struct ipv6_options_header hopbyhop; + /** Routing header */ + struct ipv6_routing_header routing; + /** Fragment header */ + struct ipv6_fragment_header fragment; + /** Destination options header */ + struct ipv6_options_header destination; +}; + +/** IPv6 header types */ +enum ipv6_header_type { + /** IPv6 hop-by-hop options header type */ + IPV6_HOPBYHOP = 0, + /** IPv6 routing header type */ + IPV6_ROUTING = 43, + /** IPv6 fragment header type */ + IPV6_FRAGMENT = 44, + /** IPv6 no next header type */ + IPV6_NO_HEADER = 59, + /** IPv6 destination options header type */ + IPV6_DESTINATION = 60, +}; + +/** IPv6 pseudo-header */ +struct ipv6_pseudo_header { + /** Source address */ + struct in6_addr src; + /** Destination address */ + struct in6_addr dest; + /** Upper-layer packet length */ + uint32_t len; + /** Zero padding */ + uint8_t zero[3]; + /** Next header */ + uint8_t next_header; +} __attribute__ (( packed )); + +/** An IPv6 address/routing table entry */ +struct ipv6_miniroute { + /** List of miniroutes */ + struct list_head list; + + /** Network device */ + struct net_device *netdev; + + /** IPv6 address */ + struct in6_addr address; + /** Prefix length */ + unsigned int prefix_len; + /** IPv6 prefix mask (derived from prefix length) */ + struct in6_addr prefix_mask; + /** Router address is present */ + int has_router; + /** Router address */ + struct in6_addr router; +}; + +/** + * Construct link-local address (via EUI-64) + * + * @v addr Address to construct + * @v netdev Network device + * @ret prefix_len Prefix length, or negative error + */ +static inline int ipv6_link_local ( struct in6_addr *addr, + struct net_device *netdev ) { + struct ll_protocol *ll_protocol = netdev->ll_protocol; + const void *ll_addr = netdev->ll_addr; + int rc; + + memset ( addr, 0, sizeof ( *addr ) ); + addr->s6_addr16[0] = htons ( 0xfe80 ); + if ( ( rc = ll_protocol->eui64 ( ll_addr, &addr->s6_addr[8] ) ) != 0 ) + return rc; + addr->s6_addr[8] ^= 0x02; + return 64; +} + +/** + * Construct solicited-node multicast address + * + * @v addr Address to construct + * @v unicast Unicast address + */ +static inline void ipv6_solicited_node ( struct in6_addr *addr, + const struct in6_addr *unicast ) { + + memset ( addr, 0, sizeof ( *addr ) ); + addr->s6_addr16[0] = htons ( 0xff02 ); + addr->s6_addr[11] = 1; + addr->s6_addr[12] = 0xff; + memcpy ( &addr->s6_addr[13], &unicast->s6_addr[13], 3 ); +} + +extern struct list_head ipv6_miniroutes; + +extern struct net_protocol ipv6_protocol __net_protocol; + +extern int ipv6_has_addr ( struct net_device *netdev, struct in6_addr *addr ); + +#endif /* _IPXE_IPV6_H */ |