/*
* 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 <errno.h>
#include <byteswap.h>
#include <ipxe/in.h>
#include <ipxe/iobuf.h>
#include <ipxe/tcpip.h>
#include <ipxe/icmpv6.h>
/** @file
*
* ICMPv6 protocol
*
*/
/**
* Process received ICMPv6 echo request packet
*
* @v iobuf I/O buffer
* @v netdev Network device
* @v sin6_src Source socket address
* @v sin6_dest Destination socket address
* @ret rc Return status code
*/
static int icmpv6_rx_echo ( struct io_buffer *iobuf,
struct net_device *netdev,
struct sockaddr_in6 *sin6_src,
struct sockaddr_in6 *sin6_dest __unused ) {
struct sockaddr_tcpip *st_src =
( ( struct sockaddr_tcpip * ) sin6_src );
struct icmpv6_echo *echo = iobuf->data;
size_t len = iob_len ( iobuf );
int rc;
/* Sanity check */
if ( iob_len ( iobuf ) < sizeof ( *echo ) ) {
DBGC ( netdev, "ICMPv6 echo request too short at %zd bytes "
"(min %zd bytes)\n", iob_len ( iobuf ),
sizeof ( *echo ) );
rc = -EINVAL;
goto done;
}
DBGC ( netdev, "ICMPv6 echo request from %s (id %#04x seq %#04x)\n",
inet6_ntoa ( &sin6_dest->sin6_addr ), ntohs ( echo->ident ),
ntohs ( echo->sequence ) );
/* Convert echo request to echo reply and recalculate checksum */
echo->icmp.type = ICMPV6_ECHO_REPLY;
echo->icmp.chksum = 0;
echo->icmp.chksum = tcpip_chksum ( echo, len );
/* Transmit echo reply */
if ( ( rc = tcpip_tx ( iob_disown ( iobuf ), &icmpv6_protocol, NULL,
st_src, netdev, &echo->icmp.chksum ) ) != 0 ) {
DBGC ( netdev, "ICMPv6 could not transmit reply: %s\n",
strerror ( rc ) );
goto done;
}
done:
free_iob ( iobuf );
return rc;
}
/** ICMPv6 echo request handlers */
struct icmpv6_handler icmpv6_echo_handler __icmpv6_handler = {
.type = ICMPV6_ECHO_REQUEST,
.rx = icmpv6_rx_echo,
};
/**
* Identify ICMPv6 handler
*
* @v type ICMPv6 type
* @ret handler ICMPv6 handler, or NULL if not found
*/
static struct icmpv6_handler * icmpv6_handler ( unsigned int type ) {
struct icmpv6_handler *handler;
for_each_table_entry ( handler, ICMPV6_HANDLERS ) {
if ( handler->type == type )
return handler;
}
return NULL;
}
/**
* 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 icmpv6_rx ( struct io_buffer *iobuf, struct net_device *netdev,
struct sockaddr_tcpip *st_src,
struct sockaddr_tcpip *st_dest, uint16_t pshdr_csum ) {
struct sockaddr_in6 *sin6_src = ( ( struct sockaddr_in6 * ) st_src );
struct sockaddr_in6 *sin6_dest = ( ( struct sockaddr_in6 * ) st_dest );
struct icmpv6_header *icmp = iobuf->data;
size_t len = iob_len ( iobuf );
struct icmpv6_handler *handler;
unsigned int csum;
int rc;
/* Sanity check */
if ( len < sizeof ( *icmp ) ) {
DBGC ( netdev, "ICMPv6 packet too short at %zd bytes (min %zd "
"bytes)\n", len, sizeof ( *icmp ) );
rc = -EINVAL;
goto done;
}
/* Verify checksum */
csum = tcpip_continue_chksum ( pshdr_csum, icmp, len );
if ( csum != 0 ) {
DBGC ( netdev, "ICMPv6 checksum incorrect (is %04x, should be "
"0000)\n", csum );
DBGC_HDA ( netdev, 0, icmp, len );
rc = -EINVAL;
goto done;
}
/* Identify handler */
handler = icmpv6_handler ( icmp->type );
if ( ! handler ) {
DBGC ( netdev, "ICMPv6 unrecognised type %d\n", icmp->type );
rc = -ENOTSUP;
goto done;
}
/* Pass to handler */
if ( ( rc = handler->rx ( iob_disown ( iobuf ), netdev, sin6_src,
sin6_dest ) ) != 0 ) {
DBGC ( netdev, "ICMPv6 could not handle type %d: %s\n",
icmp->type, strerror ( rc ) );
goto done;
}
done:
free_iob ( iobuf );
return rc;
}
/** ICMPv6 TCP/IP protocol */
struct tcpip_protocol icmpv6_protocol __tcpip_protocol = {
.name = "ICMPv6",
.rx = icmpv6_rx,
.tcpip_proto = IP_ICMP6,
};
