IPv6 protocol. More...

#include <stdint.h>
#include <string.h>
#include <byteswap.h>
#include <ipxe/in.h>
#include <ipxe/list.h>
#include <ipxe/netdevice.h>

Go to the source code of this file.

Data Structures
struct	ipv6_header
	IPv6 header. More...

struct	ipv6_extension_header_common
	IPv6 extension header common fields. More...

struct	ipv6_option
	IPv6 type-length-value options. More...

struct	ipv6_options_header
	IPv6 option-based extension header. More...

struct	ipv6_routing_header
	IPv6 routing header. More...

struct	ipv6_fragment_header
	IPv6 fragment header. More...

union	ipv6_extension_header
	IPv6 extension header. More...

struct	ipv6_pseudo_header
	IPv6 pseudo-header. More...

struct	ipv6_miniroute
	An IPv6 address/routing table entry. More...

Macros
#define	IPV6_VER 0x60000000UL
	IPv6 version. More...

#define	IPV6_MASK_VER 0xf0000000UL
	IPv6 version mask. More...

#define	IPV6_HOP_LIMIT 0xff
	IPv6 maximum hop limit. More...

#define	IPV6_DEFAULT_PREFIX_LEN 64
	IPv6 default prefix length. More...

#define	IPV6_MAX_PREFIX_LEN 128
	IPv6 maximum prefix length. More...

#define	IPV6_CAN_IGNORE_OPT(type) ( ( (type) & 0xc0 ) == 0x00 )
	Test if IPv6 option can be safely ignored. More...

#define	IPV6_MASK_OFFSET 0xfff8
	Fragment offset mask. More...

#define	IPV6_MASK_MOREFRAGS 0x0001
	More fragments. More...

#define	IPV6_SETTINGS_NAME "link"
	IPv6 link-local address settings block name. More...

Enumerations
enum	ipv6_option_type { IPV6_OPT_PAD1 = 0x00, IPV6_OPT_PADN = 0x01 }
	IPv6 option types. More...

enum	ipv6_header_type { IPV6_HOPBYHOP = 0, IPV6_ROUTING = 43, IPV6_FRAGMENT = 44, IPV6_NO_HEADER = 59, IPV6_DESTINATION = 60 }
	IPv6 header types. More...

enum	ipv6_address_scope { IPV6_SCOPE_INTERFACE_LOCAL = 0x1, IPV6_SCOPE_LINK_LOCAL = 0x2, INV6_SCOPE_ADMIN_LOCAL = 0x4, IPV6_SCOPE_SITE_LOCAL = 0x5, IPV6_SCOPE_ORGANISATION_LOCAL = 0x8, IPV6_SCOPE_GLOBAL = 0xe, IPV6_SCOPE_MAX = 0xf }
	IPv6 address scopes. More...

enum	ipv6_miniroute_flags { IPV6_HAS_ADDRESS = 0x0001, IPV6_HAS_ROUTER = 0x0002 }
	IPv6 address/routing table entry flags. More...

enum	ipv6_settings_order { IPV6_ORDER_PREFIX_ONLY = -4, IPV6_ORDER_LINK_LOCAL = -3, IPV6_ORDER_SLAAC = -2, IPV6_ORDER_DHCPV6 = -1 }
	IPv6 settings sibling order. More...

Functions
	FILE_LICENCE (GPL2_OR_LATER_OR_UBDL)

static int	ipv6_eui64 (struct in6_addr addr, struct net_device netdev)
	Construct local IPv6 address via EUI-64. More...

static int	ipv6_link_local (struct in6_addr addr, struct net_device netdev)
	Construct link-local address via EUI-64. More...

static void	ipv6_solicited_node (struct in6_addr addr, const struct in6_addr unicast)
	Construct solicited-node multicast address. More...

static void	ipv6_all_routers (struct in6_addr *addr)
	Construct all-routers multicast address. More...

static unsigned int	ipv6_multicast_scope (const struct in6_addr *addr)
	Get multicast address scope. More...

int	ipv6_has_addr (struct net_device netdev, struct in6_addr addr)
	Check if network device has a specific IPv6 address. More...

int	ipv6_add_miniroute (struct net_device netdev, struct in6_addr address, unsigned int prefix_len, struct in6_addr *router)
	Add IPv6 routing table entry. More...

void	ipv6_del_miniroute (struct ipv6_miniroute *miniroute)
	Delete IPv6 minirouting table entry. More...

struct ipv6_miniroute *	ipv6_route (unsigned int scope_id, struct in6_addr **dest)
	Perform IPv6 routing. More...

int	parse_ipv6_setting (const struct setting_type type, const char value, void *buf, size_t len)

int	format_ipv6_setting (const struct setting_type type, const void raw, size_t raw_len, char *buf, size_t len)

Variables
struct list_head	ipv6_miniroutes
	List of IPv6 miniroutes. More...

struct net_protocol ipv6_protocol	__net_protocol
	AoE protocol. More...

Detailed Description

IPv6 protocol.

Definition in file ipv6.h.

Macro Definition Documentation

◆ IPV6_VER

#define IPV6_VER 0x60000000UL

IPv6 version.

Definition at line 20 of file ipv6.h.

◆ IPV6_MASK_VER

#define IPV6_MASK_VER 0xf0000000UL

IPv6 version mask.

Definition at line 23 of file ipv6.h.

◆ IPV6_HOP_LIMIT

#define IPV6_HOP_LIMIT 0xff

IPv6 maximum hop limit.

Definition at line 26 of file ipv6.h.

◆ IPV6_DEFAULT_PREFIX_LEN

#define IPV6_DEFAULT_PREFIX_LEN 64

IPv6 default prefix length.

Definition at line 29 of file ipv6.h.

◆ IPV6_MAX_PREFIX_LEN

#define IPV6_MAX_PREFIX_LEN 128

IPv6 maximum prefix length.

Definition at line 32 of file ipv6.h.

◆ IPV6_CAN_IGNORE_OPT

#define IPV6_CAN_IGNORE_OPT ( type ) ( ( (type) & 0xc0 ) == 0x00 )

Test if IPv6 option can be safely ignored.

Definition at line 77 of file ipv6.h.

◆ IPV6_MASK_OFFSET

#define IPV6_MASK_OFFSET 0xfff8

Fragment offset mask.

Definition at line 110 of file ipv6.h.

◆ IPV6_MASK_MOREFRAGS

#define IPV6_MASK_MOREFRAGS 0x0001

More fragments.

Definition at line 113 of file ipv6.h.

◆ IPV6_SETTINGS_NAME

#define IPV6_SETTINGS_NAME "link"

IPv6 link-local address settings block name.

Definition at line 292 of file ipv6.h.

Enumeration Type Documentation

◆ ipv6_option_type

enum ipv6_option_type

IPv6 option types.

Enumerator
IPV6_OPT_PAD1	Pad1.
IPV6_OPT_PADN	PadN.

Definition at line 69 of file ipv6.h.

                       {
         /** Pad1 */
         IPV6_OPT_PAD1 = 0x00,
         /** PadN */
         IPV6_OPT_PADN = 0x01,
 };

◆ ipv6_header_type

enum ipv6_header_type

IPv6 header types.

Enumerator
IPV6_HOPBYHOP	IPv6 hop-by-hop options header type.
IPV6_ROUTING	IPv6 routing header type.
IPV6_FRAGMENT	IPv6 fragment header type.
IPV6_NO_HEADER	IPv6 no next header type.
IPV6_DESTINATION	IPv6 destination options header type.

Definition at line 134 of file ipv6.h.

                       {
         /** 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_address_scope

enum ipv6_address_scope

IPv6 address scopes.

Enumerator
IPV6_SCOPE_INTERFACE_LOCAL	Interface-local address scope.
IPV6_SCOPE_LINK_LOCAL	Link-local address scope.
INV6_SCOPE_ADMIN_LOCAL	Admin-local address scope.
IPV6_SCOPE_SITE_LOCAL	Site-local address scope.
IPV6_SCOPE_ORGANISATION_LOCAL	Organisation-local address scope.
IPV6_SCOPE_GLOBAL	Global address scope.
IPV6_SCOPE_MAX	Maximum scope.

Definition at line 162 of file ipv6.h.

                         {
         /** Interface-local address scope */
         IPV6_SCOPE_INTERFACE_LOCAL = 0x1,
         /** Link-local address scope */
         IPV6_SCOPE_LINK_LOCAL = 0x2,
         /** Admin-local address scope */
         INV6_SCOPE_ADMIN_LOCAL = 0x4,
         /** Site-local address scope */
         IPV6_SCOPE_SITE_LOCAL = 0x5,
         /** Organisation-local address scope */
         IPV6_SCOPE_ORGANISATION_LOCAL = 0x8,
         /** Global address scope */
         IPV6_SCOPE_GLOBAL = 0xe,
         /** Maximum scope */
         IPV6_SCOPE_MAX = 0xf,
 };

◆ ipv6_miniroute_flags

enum ipv6_miniroute_flags

IPv6 address/routing table entry flags.

Enumerator
IPV6_HAS_ADDRESS	Routing table entry address is valid.
IPV6_HAS_ROUTER	Routing table entry router address is valid.

Definition at line 202 of file ipv6.h.

                           {
         /** Routing table entry address is valid */
         IPV6_HAS_ADDRESS = 0x0001,
         /** Routing table entry router address is valid */
         IPV6_HAS_ROUTER = 0x0002,
 };

◆ ipv6_settings_order

enum ipv6_settings_order

IPv6 settings sibling order.

Enumerator
IPV6_ORDER_PREFIX_ONLY	No address.
IPV6_ORDER_LINK_LOCAL	Link-local address.
IPV6_ORDER_SLAAC	Address assigned via SLAAC.
IPV6_ORDER_DHCPV6	Address assigned via DHCPv6.

Definition at line 280 of file ipv6.h.

                          {
         /** No address */
         IPV6_ORDER_PREFIX_ONLY = -4,
         /** Link-local address */
         IPV6_ORDER_LINK_LOCAL = -3,
         /** Address assigned via SLAAC */
         IPV6_ORDER_SLAAC = -2,
         /** Address assigned via DHCPv6 */
         IPV6_ORDER_DHCPV6 = -1,
 };

Function Documentation

◆ FILE_LICENCE()

FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL )

◆ ipv6_eui64()

static int ipv6_eui64	(	struct in6_addr *	addr,
		struct net_device *	netdev
	)

inlinestatic

Construct local IPv6 address via EUI-64.

Parameters

addr	Prefix to be completed
netdev	Network device

Return values

prefix_len Prefix length, or negative error

Definition at line 216 of file ipv6.h.

                                                            {
         struct ll_protocol *ll_protocol = netdev->ll_protocol;
         const void *ll_addr = netdev->ll_addr;
         int rc;
 
         if ( ( rc = ll_protocol->eui64 ( ll_addr, &addr->s6_addr[8] ) ) != 0 )
                 return rc;
         addr->s6_addr[8] ^= 0x02;
         return 64;
 }

References addr, ll_protocol::eui64, net_device::ll_addr, net_device::ll_protocol, netdev, and rc.

Referenced by ipv6_link_local(), and ndp_prefix_fetch_ip6().

◆ ipv6_link_local()

static int ipv6_link_local	(	struct in6_addr *	addr,
		struct net_device *	netdev
	)

inlinestatic

Construct link-local address via EUI-64.

Parameters

addr	Zeroed address to construct
netdev	Network device

Return values

prefix_len Prefix length, or negative error

Definition at line 235 of file ipv6.h.

                                                                 {
 
         addr->s6_addr16[0] = htons ( 0xfe80 );
         return ipv6_eui64 ( addr, netdev );
 }

References addr, htons, ipv6_eui64(), and netdev.

Referenced by ipv6_fetch().

◆ ipv6_solicited_node()

static void ipv6_solicited_node	(	struct in6_addr *	addr,
		const struct in6_addr *	unicast
	)

inlinestatic

Construct solicited-node multicast address.

Parameters

addr	Zeroed address to construct
unicast	Unicast address

Definition at line 248 of file ipv6.h.

                                                                           {
 
         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 );
 }

References addr, htons, and memcpy().

Referenced by ndp_tx_request().

◆ ipv6_all_routers()

static void ipv6_all_routers ( struct in6_addr * addr )

inlinestatic

Construct all-routers multicast address.

Parameters

addr	Zeroed address to construct

Definition at line 262 of file ipv6.h.

                                                               {
         addr->s6_addr16[0] = htons ( 0xff02 );
         addr->s6_addr[15] = 2;
 }

References addr, and htons.

Referenced by ndp_tx_router_solicitation().

◆ ipv6_multicast_scope()

static unsigned int ipv6_multicast_scope ( const struct in6_addr * addr )

inlinestatic

Get multicast address scope.

Parameters

addr	Multicast address

Return values

scope Address scope

Definition at line 274 of file ipv6.h.

                                                      {
 
         return ( addr->s6_addr[1] & 0x0f );
 }

References addr.

Referenced by ipv6_scope().

◆ ipv6_has_addr()

int ipv6_has_addr	(	struct net_device *	netdev,
		struct in6_addr *	addr
	)

Check if network device has a specific IPv6 address.

Parameters

netdev	Network device
addr	IPv6 address

Return values

has_addr Network device has this IPv6 address

Definition at line 141 of file ipv6.c.

                                                                        {
         struct ipv6_miniroute *miniroute;
 
         list_for_each_entry ( miniroute, &ipv6_miniroutes, list ) {
                 if ( ( miniroute->netdev == netdev ) &&
                      ( miniroute->flags & IPV6_HAS_ADDRESS ) &&
                      ( memcmp ( &miniroute->address, addr,
                                 sizeof ( miniroute->address ) ) == 0 ) ) {
                         /* Found matching address */
                         return 1;
                 }
         }
         return 0;
 }

References addr, ipv6_miniroute::address, ipv6_miniroute::flags, IPV6_HAS_ADDRESS, ipv6_miniroutes, ipv6_miniroute::list, list_for_each_entry, memcmp(), netdev, and ipv6_miniroute::netdev.

Referenced by ipv6_rx(), and ndp_rx_neighbour_solicitation_ll_source().

◆ ipv6_add_miniroute()

int ipv6_add_miniroute	(	struct net_device *	netdev,
		struct in6_addr *	address,
		unsigned int	prefix_len,
		struct in6_addr *	router
	)

Add IPv6 routing table entry.

Parameters

netdev	Network device
address	IPv6 address (or prefix)
prefix_len	Prefix length
router	Router address (if any)

Return values

rc	Return status code

Definition at line 217 of file ipv6.c.

                                                                             {
         struct ipv6_miniroute *miniroute;
         uint8_t *prefix_mask;
         unsigned int remaining;
         unsigned int i;
 
         /* Find or create routing table entry */
         miniroute = ipv6_miniroute ( netdev, address );
         if ( miniroute ) {
 
                 /* Remove from existing position in routing table */
                 list_del ( &miniroute->list );
 
         } else {
 
                 /* Create new routing table entry */
                 miniroute = zalloc ( sizeof ( *miniroute ) );
                 if ( ! miniroute )
                         return -ENOMEM;
                 miniroute->netdev = netdev_get ( netdev );
                 memcpy ( &miniroute->address, address,
                          sizeof ( miniroute->address ) );
 
                 /* Default to prefix length of 64 if none specified */
                 if ( ! prefix_len )
                         prefix_len = IPV6_DEFAULT_PREFIX_LEN;
                 miniroute->prefix_len = prefix_len;
                 assert ( prefix_len <= IPV6_MAX_PREFIX_LEN );
 
                 /* Construct prefix mask */
                 remaining = prefix_len;
                 for ( prefix_mask = miniroute->prefix_mask.s6_addr ;
                       remaining >= 8 ; prefix_mask++, remaining -= 8 ) {
                         *prefix_mask = 0xff;
                 }
                 if ( remaining )
                         *prefix_mask = ( 0xff << ( 8 - remaining ) );
         }
 
         /* Add to start of routing table */
         list_add ( &miniroute->list, &ipv6_miniroutes );
 
         /* Set or update address, if applicable */
         for ( i = 0 ; i < ( sizeof ( address->s6_addr32 ) /
                             sizeof ( address->s6_addr32[0] ) ) ; i++ ) {
                 if ( ( address->s6_addr32[i] &
                        ~miniroute->prefix_mask.s6_addr32[i] ) != 0 ) {
                         memcpy ( &miniroute->address, address,
                                  sizeof ( miniroute->address ) );
                         miniroute->flags |= IPV6_HAS_ADDRESS;
                 }
         }
         if ( miniroute->prefix_len == IPV6_MAX_PREFIX_LEN )
                 miniroute->flags |= IPV6_HAS_ADDRESS;
 
         /* Update scope */
         miniroute->scope = ipv6_scope ( &miniroute->address );
 
         /* Set or update router, if applicable */
         if ( router ) {
                 memcpy ( &miniroute->router, router,
                          sizeof ( miniroute->router ) );
                 miniroute->flags |= IPV6_HAS_ROUTER;
         }
 
         ipv6_dump_miniroute ( miniroute );
         return 0;
 }

References address, ipv6_miniroute::address, assert(), ENOMEM, ipv6_miniroute::flags, IPV6_DEFAULT_PREFIX_LEN, ipv6_dump_miniroute(), IPV6_HAS_ADDRESS, IPV6_HAS_ROUTER, IPV6_MAX_PREFIX_LEN, ipv6_miniroute(), ipv6_miniroutes, ipv6_scope(), ipv6_miniroute::list, list_add, list_del, memcpy(), netdev, ipv6_miniroute::netdev, netdev_get(), ipv6_miniroute::prefix_len, ipv6_miniroute::prefix_mask, ipv6_miniroute::router, ipv6_miniroute::scope, and zalloc().

Referenced by ipv6_create_routes(), and ipv6_table_okx().

◆ ipv6_del_miniroute()

void ipv6_del_miniroute ( struct ipv6_miniroute * miniroute )

Delete IPv6 minirouting table entry.

Parameters

miniroute Routing table entry

Definition at line 292 of file ipv6.c.

                                                              {
 
         netdev_put ( miniroute->netdev );
         list_del ( &miniroute->list );
         free ( miniroute );
 }

References free, ipv6_miniroute::list, list_del, ipv6_miniroute::netdev, and netdev_put().

Referenced by ipv6_create_all_routes(), and ipv6_table_del().

◆ ipv6_route()

struct ipv6_miniroute* ipv6_route	(	unsigned int	scope_id,
		struct in6_addr **	dest
	)

Perform IPv6 routing.

Parameters

scope_id	Destination address scope ID (for link-local addresses)
dest	Final destination address

Return values

dest	Next hop destination address
miniroute	Routing table entry to use, or NULL if no route

Definition at line 307 of file ipv6.c.

                                                               {
         struct ipv6_miniroute *miniroute;
         struct ipv6_miniroute *chosen = NULL;
         unsigned int best = 0;
         unsigned int match_len;
         unsigned int score;
         unsigned int scope;
 
         /* Calculate destination address scope */
         scope = ipv6_scope ( *dest );
 
         /* Find first usable route in routing table */
         list_for_each_entry ( miniroute, &ipv6_miniroutes, list ) {
 
                 /* Skip closed network devices */
                 if ( ! netdev_is_open ( miniroute->netdev ) )
                         continue;
 
                 /* Skip entries with no usable source address */
                 if ( ! ( miniroute->flags & IPV6_HAS_ADDRESS ) )
                         continue;
 
                 /* Skip entries with a non-matching scope ID, if
                  * destination specifies a scope ID.
                  */
                 if ( scope_id && ( miniroute->netdev->scope_id != scope_id ) )
                         continue;
 
                 /* Skip entries that are out of scope */
                 if ( miniroute->scope < scope )
                         continue;
 
                 /* Calculate match length */
                 match_len = ipv6_match_len ( miniroute, *dest );
 
                 /* If destination is on-link, then use this route */
                 if ( match_len >= miniroute->prefix_len )
                         return miniroute;
 
                 /* If destination is unicast, then skip off-link
                  * entries with no router.
                  */
                 if ( ! ( IN6_IS_ADDR_MULTICAST ( *dest ) ||
                          ( miniroute->flags & IPV6_HAS_ROUTER ) ) )
                         continue;
 
                 /* Choose best route, defined as being the route with
                  * the smallest viable scope.  If two routes both have
                  * the same scope, then prefer the route with the
                  * longest match length.
                  */
                 score = ( ( ( IPV6_SCOPE_MAX + 1 - miniroute->scope ) << 8 )
                           + match_len );
                 if ( score > best ) {
                         chosen = miniroute;
                         best = score;
                 }
         }
 
         /* Return chosen route, if any */
         if ( chosen ) {
                 if ( ! IN6_IS_ADDR_MULTICAST ( *dest ) )
                         *dest = &chosen->router;
                 return chosen;
         }
 
         return NULL;
 }

References dest, ipv6_miniroute::flags, IN6_IS_ADDR_MULTICAST, IPV6_HAS_ADDRESS, IPV6_HAS_ROUTER, ipv6_match_len(), ipv6_miniroutes, ipv6_scope(), IPV6_SCOPE_MAX, ipv6_miniroute::list, list_for_each_entry, ipv6_miniroute::netdev, netdev_is_open(), NULL, ipv6_miniroute::prefix_len, ipv6_miniroute::router, scope, ipv6_miniroute::scope, and net_device::scope_id.

Referenced by ipv6_netdev(), ipv6_route_okx(), and ipv6_tx().

◆ parse_ipv6_setting()

int parse_ipv6_setting	(	const struct setting_type *	type,
		const char *	value,
		void *	buf,
		size_t	len
	)

◆ format_ipv6_setting()

int format_ipv6_setting	(	const struct setting_type *	type,
		const void *	raw,
		size_t	raw_len,
		char *	buf,
		size_t	len
	)

Variable Documentation

◆ ipv6_miniroutes

struct list_head ipv6_miniroutes

List of IPv6 miniroutes.

Definition at line 60 of file ipv6.c.

Referenced by ipv6_add_miniroute(), ipv6_create_all_routes(), ipv6_has_addr(), ipv6_miniroute(), ipv6_route(), ipv6_route_okx(), ipv6_table_del(), ipv6_table_okx(), and route_ipv6_print().

◆ __net_protocol

struct net_protocol ipv6_protocol __net_protocol

AoE protocol.

FIP protocol.

Definition at line 55 of file aoe.c.

Data Structures

Macros

Enumerations

Functions

Variables

Detailed Description

Macro Definition Documentation

◆ IPV6_VER

◆ IPV6_MASK_VER

◆ IPV6_HOP_LIMIT

◆ IPV6_DEFAULT_PREFIX_LEN

◆ IPV6_MAX_PREFIX_LEN

◆ IPV6_CAN_IGNORE_OPT

◆ IPV6_MASK_OFFSET

◆ IPV6_MASK_MOREFRAGS

◆ IPV6_SETTINGS_NAME

Enumeration Type Documentation

◆ ipv6_option_type

◆ ipv6_header_type

◆ ipv6_address_scope

◆ ipv6_miniroute_flags

◆ ipv6_settings_order

Function Documentation

◆ FILE_LICENCE()

◆ ipv6_eui64()

◆ ipv6_link_local()

◆ ipv6_solicited_node()

◆ ipv6_all_routers()

◆ ipv6_multicast_scope()

◆ ipv6_has_addr()

◆ ipv6_add_miniroute()

◆ ipv6_del_miniroute()

◆ ipv6_route()

◆ parse_ipv6_setting()

◆ format_ipv6_setting()

Variable Documentation

◆ ipv6_miniroutes

◆ __net_protocol