8406115834
Access to the gpxe.org and etherboot.org domains and associated resources has been revoked by the registrant of the domain. Work around this problem by renaming project from gPXE to iPXE, and updating URLs to match. Also update README, LOG and COPYRIGHTS to remove obsolete information. Signed-off-by: Michael Brown <mcb30@ipxe.org>
104 lines
2.6 KiB
C
104 lines
2.6 KiB
C
/*
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* Copyright (C) 2009 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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FILE_LICENCE ( GPL2_OR_LATER );
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#include <string.h>
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#include <errno.h>
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#include <ipxe/iobuf.h>
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#include <ipxe/in.h>
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#include <ipxe/tcpip.h>
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#include <ipxe/icmp.h>
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/** @file
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*
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* ICMP protocol
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*
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*/
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struct tcpip_protocol icmp_protocol __tcpip_protocol;
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/**
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* Process a received packet
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*
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* @v iobuf I/O buffer
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* @v st_src Partially-filled source address
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* @v st_dest Partially-filled destination address
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* @v pshdr_csum Pseudo-header checksum
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* @ret rc Return status code
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*/
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static int icmp_rx ( struct io_buffer *iobuf, struct sockaddr_tcpip *st_src,
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struct sockaddr_tcpip *st_dest,
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uint16_t pshdr_csum __unused ) {
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struct icmp_header *icmp = iobuf->data;
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size_t len = iob_len ( iobuf );
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unsigned int csum;
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int rc;
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/* Sanity check */
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if ( len < sizeof ( *icmp ) ) {
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DBG ( "ICMP packet too short at %zd bytes (min %zd bytes)\n",
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len, sizeof ( *icmp ) );
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rc = -EINVAL;
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goto done;
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}
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/* Verify checksum */
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csum = tcpip_chksum ( icmp, len );
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if ( csum != 0 ) {
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DBG ( "ICMP checksum incorrect (is %04x, should be 0000)\n",
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csum );
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DBG_HD ( icmp, len );
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rc = -EINVAL;
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goto done;
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}
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/* We respond only to pings */
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if ( icmp->type != ICMP_ECHO_REQUEST ) {
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DBG ( "ICMP ignoring type %d\n", icmp->type );
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rc = 0;
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goto done;
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}
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DBG ( "ICMP responding to ping\n" );
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/* Change type to response and recalculate checksum */
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icmp->type = ICMP_ECHO_RESPONSE;
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icmp->chksum = 0;
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icmp->chksum = tcpip_chksum ( icmp, len );
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/* Transmit the response */
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if ( ( rc = tcpip_tx ( iob_disown ( iobuf ), &icmp_protocol, st_dest,
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st_src, NULL, NULL ) ) != 0 ) {
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DBG ( "ICMP could not transmit ping response: %s\n",
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strerror ( rc ) );
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goto done;
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}
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done:
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free_iob ( iobuf );
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return rc;
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}
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/** ICMP TCP/IP protocol */
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struct tcpip_protocol icmp_protocol __tcpip_protocol = {
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.name = "ICMP",
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.rx = icmp_rx,
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.tcpip_proto = IP_ICMP,
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};
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