114 lines
3.0 KiB
C
114 lines
3.0 KiB
C
/*
|
|
* 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.
|
|
*
|
|
* You can also choose to distribute this program under the terms of
|
|
* the Unmodified Binary Distribution Licence (as given in the file
|
|
* COPYING.UBDL), provided that you have satisfied its requirements.
|
|
*/
|
|
|
|
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
|
|
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
#include <ipxe/iobuf.h>
|
|
#include <ipxe/in.h>
|
|
#include <ipxe/tcpip.h>
|
|
#include <ipxe/icmp.h>
|
|
|
|
/** @file
|
|
*
|
|
* ICMPv4 protocol
|
|
*
|
|
*/
|
|
|
|
struct icmp_echo_protocol icmpv4_echo_protocol __icmp_echo_protocol;
|
|
|
|
/**
|
|
* Process a received packet
|
|
*
|
|
* @v iobuf I/O buffer
|
|
* @v netdev Network device
|
|
* @v st_src Partially-filled source address
|
|
* @v st_dest Partially-filled destination address
|
|
* @v pshdr_csum Pseudo-header checksum
|
|
* @ret rc Return status code
|
|
*/
|
|
static int icmpv4_rx ( struct io_buffer *iobuf,
|
|
struct net_device *netdev __unused,
|
|
struct sockaddr_tcpip *st_src,
|
|
struct sockaddr_tcpip *st_dest __unused,
|
|
uint16_t pshdr_csum __unused ) {
|
|
struct icmp_header *icmp = iobuf->data;
|
|
size_t len = iob_len ( iobuf );
|
|
unsigned int csum;
|
|
unsigned int type;
|
|
int rc;
|
|
|
|
/* Sanity check */
|
|
if ( len < sizeof ( *icmp ) ) {
|
|
DBG ( "ICMP packet too short at %zd bytes (min %zd bytes)\n",
|
|
len, sizeof ( *icmp ) );
|
|
rc = -EINVAL;
|
|
goto discard;
|
|
}
|
|
|
|
/* Verify checksum */
|
|
csum = tcpip_chksum ( icmp, len );
|
|
if ( csum != 0 ) {
|
|
DBG ( "ICMP checksum incorrect (is %04x, should be 0000)\n",
|
|
csum );
|
|
DBG_HD ( icmp, len );
|
|
rc = -EINVAL;
|
|
goto discard;
|
|
}
|
|
|
|
/* Handle ICMP packet */
|
|
type = icmp->type;
|
|
switch ( type ) {
|
|
case ICMP_ECHO_REQUEST:
|
|
return icmp_rx_echo_request ( iobuf, st_src,
|
|
&icmpv4_echo_protocol );
|
|
case ICMP_ECHO_REPLY:
|
|
return icmp_rx_echo_reply ( iobuf, st_src );
|
|
default:
|
|
DBG ( "ICMP ignoring type %d\n", type );
|
|
rc = 0;
|
|
break;
|
|
}
|
|
|
|
discard:
|
|
free_iob ( iobuf );
|
|
return rc;
|
|
}
|
|
|
|
/** ICMPv4 TCP/IP protocol */
|
|
struct tcpip_protocol icmpv4_protocol __tcpip_protocol = {
|
|
.name = "ICMPv4",
|
|
.rx = icmpv4_rx,
|
|
.tcpip_proto = IP_ICMP,
|
|
};
|
|
|
|
/** ICMPv4 echo protocol */
|
|
struct icmp_echo_protocol icmpv4_echo_protocol __icmp_echo_protocol = {
|
|
.family = AF_INET,
|
|
.request = ICMP_ECHO_REQUEST,
|
|
.reply = ICMP_ECHO_REPLY,
|
|
.tcpip_protocol = &icmpv4_protocol,
|
|
.net_checksum = 0,
|
|
};
|