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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.
*
* 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 <byteswap.h>
#include <ipxe/in.h>
#include <ipxe/iobuf.h>
#include <ipxe/tcpip.h>
#include <ipxe/ping.h>
#include <ipxe/icmpv6.h>
/** @file
*
* ICMPv6 protocol
*
*/
/* Disambiguate the various error causes */
#define EHOSTUNREACH_ROUTE \
__einfo_error ( EINFO_EHOSTUNREACH_ROUTE )
#define EINFO_EHOSTUNREACH_ROUTE \
__einfo_uniqify ( EINFO_EHOSTUNREACH, 0, \
"No route to destination" )
#define EHOSTUNREACH_PROHIBITED \
__einfo_error ( EINFO_EHOSTUNREACH_PROHIBITED )
#define EINFO_EHOSTUNREACH_PROHIBITED \
__einfo_uniqify ( EINFO_EHOSTUNREACH, 1, \
"Communication administratively prohibited" )
#define EHOSTUNREACH_ADDRESS \
__einfo_error ( EINFO_EHOSTUNREACH_ADDRESS )
#define EINFO_EHOSTUNREACH_ADDRESS \
__einfo_uniqify ( EINFO_EHOSTUNREACH, 3, \
"Address unreachable" )
#define EHOSTUNREACH_PORT \
__einfo_error ( EINFO_EHOSTUNREACH_PORT )
#define EINFO_EHOSTUNREACH_PORT \
__einfo_uniqify ( EINFO_EHOSTUNREACH, 4, \
"Port unreachable" )
#define EHOSTUNREACH_CODE( code ) \
EUNIQ ( EINFO_EHOSTUNREACH, ( (code) & 0x1f ), \
EHOSTUNREACH_ROUTE, EHOSTUNREACH_PROHIBITED, \
EHOSTUNREACH_ADDRESS, EHOSTUNREACH_PORT )
#define ETIMEDOUT_HOP \
__einfo_error ( EINFO_ETIMEDOUT_HOP )
#define EINFO_ETIMEDOUT_HOP \
__einfo_uniqify ( EINFO_ETIMEDOUT, 0, \
"Hop limit exceeded in transit" )
#define ETIMEDOUT_REASSEMBLY \
__einfo_error ( EINFO_ETIMEDOUT_REASSEMBLY )
#define EINFO_ETIMEDOUT_REASSEMBLY \
__einfo_uniqify ( EINFO_ETIMEDOUT, 1, \
"Fragment reassembly time exceeded" )
#define ETIMEDOUT_CODE( code ) \
EUNIQ ( EINFO_ETIMEDOUT, ( (code) & 0x1f ), \
ETIMEDOUT_HOP, ETIMEDOUT_REASSEMBLY )
#define EPROTO_BAD_HEADER \
__einfo_error ( EINFO_EPROTO_BAD_HEADER )
#define EINFO_EPROTO_BAD_HEADER \
__einfo_uniqify ( EINFO_EPROTO, 0, \
"Erroneous header field" )
#define EPROTO_NEXT_HEADER \
__einfo_error ( EINFO_EPROTO_NEXT_HEADER )
#define EINFO_EPROTO_NEXT_HEADER \
__einfo_uniqify ( EINFO_EPROTO, 1, \
"Unrecognised next header type" )
#define EPROTO_OPTION \
__einfo_error ( EINFO_EPROTO_OPTION )
#define EINFO_EPROTO_OPTION \
__einfo_uniqify ( EINFO_EPROTO, 2, \
"Unrecognised IPv6 option" )
#define EPROTO_CODE( code ) \
EUNIQ ( EINFO_EPROTO, ( (code) & 0x1f ), \
EPROTO_BAD_HEADER, EPROTO_NEXT_HEADER, EPROTO_OPTION )
struct icmp_echo_protocol icmpv6_echo_protocol __icmp_echo_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_request ( struct io_buffer *iobuf,
struct net_device *netdev __unused,
struct sockaddr_in6 *sin6_src,
struct sockaddr_in6 *sin6_dest __unused ) {
struct sockaddr_tcpip *st_src =
( ( struct sockaddr_tcpip * ) sin6_src );
return icmp_rx_echo_request ( iobuf, st_src, &icmpv6_echo_protocol );
}
/** ICMPv6 echo request handler */
struct icmpv6_handler icmpv6_echo_request_handler __icmpv6_handler = {
.type = ICMPV6_ECHO_REQUEST,
.rx = icmpv6_rx_echo_request,
};
/**
* Process received ICMPv6 echo reply 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_reply ( struct io_buffer *iobuf,
struct net_device *netdev __unused,
struct sockaddr_in6 *sin6_src,
struct sockaddr_in6 *sin6_dest __unused ) {
struct sockaddr_tcpip *st_src =
( ( struct sockaddr_tcpip * ) sin6_src );
return icmp_rx_echo_reply ( iobuf, st_src );
}
/** ICMPv6 echo reply handler */
struct icmpv6_handler icmpv6_echo_reply_handler __icmpv6_handler = {
.type = ICMPV6_ECHO_REPLY,
.rx = icmpv6_rx_echo_reply,
};
/**
* 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 icmp_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 ) {
switch ( icmp->type ) {
case ICMPV6_DESTINATION_UNREACHABLE:
rc = -EHOSTUNREACH_CODE ( icmp->code );
break;
case ICMPV6_PACKET_TOO_BIG:
rc = -ERANGE;
break;
case ICMPV6_TIME_EXCEEDED:
rc = -ETIMEDOUT_CODE ( icmp->code );
break;
case ICMPV6_PARAMETER_PROBLEM:
rc = -EPROTO_CODE ( icmp->code );
break;
default:
DBGC ( netdev, "ICMPv6 unrecognised type %d code %d\n",
icmp->type, icmp->code );
rc = -ENOTSUP;
break;
};
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,
};
/** ICMPv6 echo protocol */
struct icmp_echo_protocol icmpv6_echo_protocol __icmp_echo_protocol = {
.family = AF_INET6,
.request = ICMPV6_ECHO_REQUEST,
.reply = ICMPV6_ECHO_REPLY,
.tcpip_protocol = &icmpv6_protocol,
.net_checksum = 1,
};
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