5c2ffc26cc
Merge common functionality between IPv4 and IPv6 ICMP echo handling, and add support for transmitting ICMP echo requests and delivering ICMP echo replies to a (not yet implemented) ping_rx() function. Signed-off-by: Michael Brown <mcb30@ipxe.org>
110 lines
2.8 KiB
C
110 lines
2.8 KiB
C
/*
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* Copyright (C) 2013 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., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, 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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* ICMPv4 protocol
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*
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*/
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struct icmp_echo_protocol icmpv4_echo_protocol __icmp_echo_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 netdev Network device
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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 icmpv4_rx ( struct io_buffer *iobuf,
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struct net_device *netdev __unused,
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struct sockaddr_tcpip *st_src,
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struct sockaddr_tcpip *st_dest __unused,
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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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unsigned int type;
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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 discard;
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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 discard;
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}
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/* Handle ICMP packet */
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type = icmp->type;
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switch ( type ) {
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case ICMP_ECHO_REQUEST:
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return icmp_rx_echo_request ( iobuf, st_src,
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&icmpv4_echo_protocol );
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case ICMP_ECHO_REPLY:
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return icmp_rx_echo_reply ( iobuf, st_src );
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default:
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DBG ( "ICMP ignoring type %d\n", type );
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rc = 0;
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break;
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}
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discard:
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free_iob ( iobuf );
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return rc;
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}
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/** ICMPv4 TCP/IP protocol */
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struct tcpip_protocol icmpv4_protocol __tcpip_protocol = {
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.name = "ICMPv4",
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.rx = icmpv4_rx,
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.tcpip_proto = IP_ICMP,
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};
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/** ICMPv4 echo protocol */
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struct icmp_echo_protocol icmpv4_echo_protocol __icmp_echo_protocol = {
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.family = AF_INET,
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.request = ICMP_ECHO_REQUEST,
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.reply = ICMP_ECHO_REPLY,
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.tcpip_protocol = &icmpv4_protocol,
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.net_checksum = 0,
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};
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