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/*
* Copyright (C) 2013 Michael Brown <mbrown@fensystems.co.uk>.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <string.h>
#include <byteswap.h>
#include <errno.h>
#include <ipxe/iobuf.h>
#include <ipxe/in.h>
#include <ipxe/tcpip.h>
#include <ipxe/ping.h>
#include <ipxe/crc32.h>
#include <ipxe/icmp.h>
/** @file
*
* ICMP protocol
*
*/
/**
* Identify ICMP echo protocol
*
* @v st_family Address family
* @ret echo_protocol ICMP echo protocol, or NULL
*/
static struct icmp_echo_protocol * icmp_echo_protocol ( sa_family_t family ) {
struct icmp_echo_protocol *echo_protocol;
for_each_table_entry ( echo_protocol, ICMP_ECHO_PROTOCOLS ) {
if ( echo_protocol->family == family )
return echo_protocol;
}
return NULL;
}
/**
*
* Determine debugging colour for ICMP debug messages
*
* @v st_peer Peer address
* @ret col Debugging colour (for DBGC())
*/
static uint32_t icmpcol ( struct sockaddr_tcpip *st_peer ) {
return crc32_le ( 0, st_peer, sizeof ( *st_peer ) );
}
/**
* Transmit ICMP echo packet
*
* @v iobuf I/O buffer
* @v st_dest Destination socket address
* @v echo_protocol ICMP echo protocol
* @ret rc Return status code
*/
static int icmp_tx_echo ( struct io_buffer *iobuf,
struct sockaddr_tcpip *st_dest,
struct icmp_echo_protocol *echo_protocol ) {
struct icmp_echo *echo = iobuf->data;
int rc;
/* Set ICMP type and (re)calculate checksum */
echo->icmp.chksum = 0;
echo->icmp.chksum = tcpip_chksum ( echo, iob_len ( iobuf ) );
/* Transmit packet */
if ( ( rc = tcpip_tx ( iobuf, echo_protocol->tcpip_protocol, NULL,
st_dest, NULL,
( echo_protocol->net_checksum ?
&echo->icmp.chksum : NULL ) ) ) != 0 )
return rc;
return 0;
}
/**
* Transmit ICMP echo request
*
* @v iobuf I/O buffer
* @v st_dest Destination socket address
* @ret rc Return status code
*/
int icmp_tx_echo_request ( struct io_buffer *iobuf,
struct sockaddr_tcpip *st_dest ) {
struct icmp_echo *echo = iobuf->data;
struct icmp_echo_protocol *echo_protocol;
int rc;
/* Identify ICMP echo protocol */
echo_protocol = icmp_echo_protocol ( st_dest->st_family );
if ( ! echo_protocol ) {
DBGC ( icmpcol ( st_dest ), "ICMP TX echo request unknown "
"address family %d\n", st_dest->st_family );
free_iob ( iobuf );
return -ENOTSUP;
}
/* Set type */
echo->icmp.type = echo_protocol->request;
/* Transmit request */
DBGC ( icmpcol ( st_dest ), "ICMP TX echo request id %04x seq %04x\n",
ntohs ( echo->ident ), ntohs ( echo->sequence ) );
if ( ( rc = icmp_tx_echo ( iobuf, st_dest, echo_protocol ) ) != 0 )
return rc;
return 0;
}
/**
* Transmit ICMP echo reply
*
* @v iobuf I/O buffer
* @v st_dest Destination socket address
* @ret rc Return status code
*/
static int icmp_tx_echo_reply ( struct io_buffer *iobuf,
struct sockaddr_tcpip *st_dest,
struct icmp_echo_protocol *echo_protocol ) {
struct icmp_echo *echo = iobuf->data;
int rc;
/* Set type */
echo->icmp.type = echo_protocol->reply;
/* Transmit reply */
DBGC ( icmpcol ( st_dest ), "ICMP TX echo reply id %04x seq %04x\n",
ntohs ( echo->ident ), ntohs ( echo->sequence ) );
if ( ( rc = icmp_tx_echo ( iobuf, st_dest, echo_protocol ) ) != 0 )
return rc;
return 0;
}
/**
* Process a received ICMP echo request
*
* @v iobuf I/O buffer
* @v st_src Source socket address
* @v echo_protocol ICMP echo protocol
* @ret rc Return status code
*/
int icmp_rx_echo_request ( struct io_buffer *iobuf,
struct sockaddr_tcpip *st_src,
struct icmp_echo_protocol *echo_protocol ) {
struct icmp_echo *echo = iobuf->data;
int rc;
/* Sanity check */
if ( iob_len ( iobuf ) < sizeof ( *echo ) ) {
DBGC ( icmpcol ( st_src ), "ICMP RX echo request too short at "
"%zd bytes (min %zd bytes)\n",
iob_len ( iobuf ), sizeof ( *echo ) );
free_iob ( iobuf );
return -EINVAL;
}
DBGC ( icmpcol ( st_src ), "ICMP RX echo request id %04x seq %04x\n",
ntohs ( echo->ident ), ntohs ( echo->sequence ) );
/* Transmit echo reply */
if ( ( rc = icmp_tx_echo_reply ( iobuf, st_src, echo_protocol ) ) != 0 )
return rc;
return 0;
}
/**
* Process a received ICMP echo request
*
* @v iobuf I/O buffer
* @v st_src Source socket address
* @ret rc Return status code
*/
int icmp_rx_echo_reply ( struct io_buffer *iobuf,
struct sockaddr_tcpip *st_src ) {
struct icmp_echo *echo = iobuf->data;
int rc;
/* Sanity check */
if ( iob_len ( iobuf ) < sizeof ( *echo ) ) {
DBGC ( icmpcol ( st_src ), "ICMP RX echo reply too short at "
"%zd bytes (min %zd bytes)\n",
iob_len ( iobuf ), sizeof ( *echo ) );
free_iob ( iobuf );
return -EINVAL;
}
DBGC ( icmpcol ( st_src ), "ICMP RX echo reply id %04x seq %04x\n",
ntohs ( echo->ident ), ntohs ( echo->sequence ) );
/* Deliver to ping protocol */
if ( ( rc = ping_rx ( iobuf, st_src ) ) != 0 )
return rc;
return 0;
}
/**
* Receive ping reply (when no ping protocol is present)
*
* @v iobuf I/O buffer
* @v st_src Source socket address
* @ret rc Return status code
*/
__weak int ping_rx ( struct io_buffer *iobuf,
struct sockaddr_tcpip *st_src __unused ) {
free_iob ( iobuf );
return 0;
}
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