arp.h File Reference

Address Resolution Protocol. More...

#include <ipxe/tables.h>
#include <ipxe/netdevice.h>
#include <ipxe/neighbour.h>

Go to the source code of this file.

Data Structures
struct	arp_net_protocol
	A network-layer protocol that relies upon ARP. More...

Macros
#define	ARP_NET_PROTOCOLS    __table ( struct arp_net_protocol, "arp_net_protocols" )
	ARP protocol table.
#define	__arp_net_protocol   __table_entry ( ARP_NET_PROTOCOLS, 01 )
	Declare an ARP protocol.

Functions
	FILE_LICENCE (GPL2_OR_LATER_OR_UBDL)
	FILE_SECBOOT (PERMITTED)
static int	arp_tx (struct io_buffer *iobuf, struct net_device *netdev, struct net_protocol *net_protocol, const void *net_dest, const void *net_source)
	Transmit packet, determining link-layer address via ARP.
int	arp_tx_request (struct net_device *netdev, struct net_protocol *net_protocol, const void *net_dest, const void *net_source)
	Transmit ARP request.

Variables
struct net_protocol arp_protocol	__net_protocol
	AoE protocol.
struct neighbour_discovery	arp_discovery
	ARP neighbour discovery protocol.

Detailed Description

Address Resolution Protocol.

Definition in file arp.h.

Macro Definition Documentation

ARP_NET_PROTOCOLS

#define ARP_NET_PROTOCOLS    __table ( struct arp_net_protocol, "arp_net_protocols" )

ARP protocol table.

Definition at line 32 of file arp.h.

#define ARP_NET_PROTOCOLS \
        __table ( struct arp_net_protocol, "arp_net_protocols" )

Referenced by arp_find_protocol().

__arp_net_protocol

#define __arp_net_protocol   __table_entry ( ARP_NET_PROTOCOLS, 01 )

Declare an ARP protocol.

Definition at line 36 of file arp.h.

Function Documentation

FILE_LICENCE()

FILE_LICENCE

(

GPL2_OR_LATER_OR_UBDL

)

FILE_SECBOOT()

FILE_SECBOOT

(

PERMITTED

)

arp_tx()

int arp_tx ( struct io_buffer * iobuf, struct net_device * netdev, struct net_protocol * net_protocol, const void * net_dest, const void * net_source )

inlinestatic

Transmit packet, determining link-layer address via ARP.

Parameters

iobuf	I/O buffer
netdev	Network device
net_protocol	Network-layer protocol
net_dest	Destination network-layer address
net_source	Source network-layer address

Return values

rc	Return status code

Definition at line 51 of file arp.h.

                                                                          {
 
        return neighbour_tx ( iobuf, netdev, net_protocol, net_dest,
                              &arp_discovery, net_source );
}

References arp_discovery, neighbour_tx(), and netdev.

Referenced by ipv4_tx().

arp_tx_request()

int arp_tx_request ( struct net_device * netdev, struct net_protocol * net_protocol, const void * net_dest, const void * net_source )

extern

Transmit ARP request.

Parameters

netdev	Network device
net_protocol	Network-layer protocol
net_dest	Destination network-layer address
net_source	Source network-layer address

Return values

rc	Return status code

Definition at line 60 of file arp.c.

                                                                    {
        struct ll_protocol *ll_protocol = netdev->ll_protocol;
        struct io_buffer *iobuf;
        struct arphdr *arphdr;
        int rc;
 
        /* Allocate ARP packet */
        iobuf = alloc_iob ( MAX_LL_HEADER_LEN + sizeof ( *arphdr ) +
                            ( 2 * ( MAX_LL_ADDR_LEN + MAX_NET_ADDR_LEN ) ) );
        if ( ! iobuf )
                return -ENOMEM;
        iob_reserve ( iobuf, MAX_LL_HEADER_LEN );
 
        /* Build up ARP request */
        arphdr = iob_put ( iobuf, sizeof ( *arphdr ) );
        arphdr->ar_hrd = ll_protocol->ll_proto;
        arphdr->ar_hln = ll_protocol->ll_addr_len;
        arphdr->ar_pro = net_protocol->net_proto;
        arphdr->ar_pln = net_protocol->net_addr_len;
        arphdr->ar_op = htons ( ARPOP_REQUEST );
        memcpy ( iob_put ( iobuf, ll_protocol->ll_addr_len ),
                 netdev->ll_addr, ll_protocol->ll_addr_len );
        memcpy ( iob_put ( iobuf, net_protocol->net_addr_len ),
                 net_source, net_protocol->net_addr_len );
        memset ( iob_put ( iobuf, ll_protocol->ll_addr_len ),
                 0, ll_protocol->ll_addr_len );
        memcpy ( iob_put ( iobuf, net_protocol->net_addr_len ),
                 net_dest, net_protocol->net_addr_len );
 
        /* Transmit ARP request */
        if ( ( rc = net_tx ( iobuf, netdev, &arp_protocol,
                             netdev->ll_broadcast, netdev->ll_addr ) ) != 0 ) {
                DBGC ( netdev, "ARP %s %s %s could not transmit request: %s\n",
                       netdev->name, net_protocol->name,
                       net_protocol->ntoa ( net_dest ), strerror ( rc ) );
                return rc;
        }
 
        return 0;
}

References alloc_iob(), arphdr::ar_hln, arphdr::ar_hrd, arphdr::ar_op, arphdr::ar_pln, arphdr::ar_pro, ARPOP_REQUEST, DBGC, ENOMEM, htons, iob_put, iob_reserve, ll_protocol::ll_addr_len, ll_protocol::ll_proto, MAX_LL_ADDR_LEN, MAX_LL_HEADER_LEN, MAX_NET_ADDR_LEN, memcpy(), memset(), net_protocol::name, net_protocol::net_addr_len, net_protocol::net_proto, net_tx(), netdev, net_protocol::ntoa, rc, and strerror().

Referenced by ipoib_transmit(), and ipv4_gratuitous_arp().

Variable Documentation

__net_protocol

struct net_protocol arp_protocol __net_protocol

extern

AoE protocol.

AoE protocol.

AoE protocol.

FIP protocol.

Definition at line 56 of file aoe.c.

arp_discovery

struct neighbour_discovery arp_discovery

extern

ARP neighbour discovery protocol.

Definition at line 104 of file arp.c.

                                           {
        .name = "ARP",
        .tx_request = arp_tx_request,
};

Referenced by arp_tx().