260 lines
7.6 KiB
C
260 lines
7.6 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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* You can also choose to distribute this program under the terms of
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* the Unmodified Binary Distribution Licence (as given in the file
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* COPYING.UBDL), provided that you have satisfied its requirements.
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*/
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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#include <string.h>
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#include <errno.h>
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#include <byteswap.h>
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#include <ipxe/in.h>
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#include <ipxe/iobuf.h>
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#include <ipxe/tcpip.h>
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#include <ipxe/ping.h>
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#include <ipxe/icmpv6.h>
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/** @file
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*
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* ICMPv6 protocol
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*
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*/
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/* Disambiguate the various error causes */
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#define EHOSTUNREACH_ROUTE \
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__einfo_error ( EINFO_EHOSTUNREACH_ROUTE )
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#define EINFO_EHOSTUNREACH_ROUTE \
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__einfo_uniqify ( EINFO_EHOSTUNREACH, 0, \
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"No route to destination" )
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#define EHOSTUNREACH_PROHIBITED \
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__einfo_error ( EINFO_EHOSTUNREACH_PROHIBITED )
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#define EINFO_EHOSTUNREACH_PROHIBITED \
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__einfo_uniqify ( EINFO_EHOSTUNREACH, 1, \
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"Communication administratively prohibited" )
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#define EHOSTUNREACH_ADDRESS \
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__einfo_error ( EINFO_EHOSTUNREACH_ADDRESS )
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#define EINFO_EHOSTUNREACH_ADDRESS \
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__einfo_uniqify ( EINFO_EHOSTUNREACH, 3, \
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"Address unreachable" )
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#define EHOSTUNREACH_PORT \
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__einfo_error ( EINFO_EHOSTUNREACH_PORT )
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#define EINFO_EHOSTUNREACH_PORT \
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__einfo_uniqify ( EINFO_EHOSTUNREACH, 4, \
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"Port unreachable" )
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#define EHOSTUNREACH_CODE( code ) \
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EUNIQ ( EINFO_EHOSTUNREACH, ( (code) & 0x1f ), \
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EHOSTUNREACH_ROUTE, EHOSTUNREACH_PROHIBITED, \
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EHOSTUNREACH_ADDRESS, EHOSTUNREACH_PORT )
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#define ETIMEDOUT_HOP \
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__einfo_error ( EINFO_ETIMEDOUT_HOP )
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#define EINFO_ETIMEDOUT_HOP \
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__einfo_uniqify ( EINFO_ETIMEDOUT, 0, \
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"Hop limit exceeded in transit" )
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#define ETIMEDOUT_REASSEMBLY \
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__einfo_error ( EINFO_ETIMEDOUT_REASSEMBLY )
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#define EINFO_ETIMEDOUT_REASSEMBLY \
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__einfo_uniqify ( EINFO_ETIMEDOUT, 1, \
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"Fragment reassembly time exceeded" )
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#define ETIMEDOUT_CODE( code ) \
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EUNIQ ( EINFO_ETIMEDOUT, ( (code) & 0x1f ), \
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ETIMEDOUT_HOP, ETIMEDOUT_REASSEMBLY )
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#define EPROTO_BAD_HEADER \
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__einfo_error ( EINFO_EPROTO_BAD_HEADER )
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#define EINFO_EPROTO_BAD_HEADER \
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__einfo_uniqify ( EINFO_EPROTO, 0, \
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"Erroneous header field" )
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#define EPROTO_NEXT_HEADER \
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__einfo_error ( EINFO_EPROTO_NEXT_HEADER )
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#define EINFO_EPROTO_NEXT_HEADER \
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__einfo_uniqify ( EINFO_EPROTO, 1, \
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"Unrecognised next header type" )
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#define EPROTO_OPTION \
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__einfo_error ( EINFO_EPROTO_OPTION )
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#define EINFO_EPROTO_OPTION \
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__einfo_uniqify ( EINFO_EPROTO, 2, \
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"Unrecognised IPv6 option" )
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#define EPROTO_CODE( code ) \
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EUNIQ ( EINFO_EPROTO, ( (code) & 0x1f ), \
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EPROTO_BAD_HEADER, EPROTO_NEXT_HEADER, EPROTO_OPTION )
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struct icmp_echo_protocol icmpv6_echo_protocol __icmp_echo_protocol;
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/**
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* Process received ICMPv6 echo request 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 sin6_src Source socket address
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* @v sin6_dest Destination socket address
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* @ret rc Return status code
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*/
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static int icmpv6_rx_echo_request ( struct io_buffer *iobuf,
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struct net_device *netdev __unused,
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struct sockaddr_in6 *sin6_src,
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struct sockaddr_in6 *sin6_dest __unused ) {
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struct sockaddr_tcpip *st_src =
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( ( struct sockaddr_tcpip * ) sin6_src );
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return icmp_rx_echo_request ( iobuf, st_src, &icmpv6_echo_protocol );
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}
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/** ICMPv6 echo request handler */
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struct icmpv6_handler icmpv6_echo_request_handler __icmpv6_handler = {
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.type = ICMPV6_ECHO_REQUEST,
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.rx = icmpv6_rx_echo_request,
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};
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/**
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* Process received ICMPv6 echo reply 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 sin6_src Source socket address
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* @v sin6_dest Destination socket address
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* @ret rc Return status code
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*/
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static int icmpv6_rx_echo_reply ( struct io_buffer *iobuf,
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struct net_device *netdev __unused,
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struct sockaddr_in6 *sin6_src,
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struct sockaddr_in6 *sin6_dest __unused ) {
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struct sockaddr_tcpip *st_src =
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( ( struct sockaddr_tcpip * ) sin6_src );
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return icmp_rx_echo_reply ( iobuf, st_src );
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}
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/** ICMPv6 echo reply handler */
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struct icmpv6_handler icmpv6_echo_reply_handler __icmpv6_handler = {
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.type = ICMPV6_ECHO_REPLY,
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.rx = icmpv6_rx_echo_reply,
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};
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/**
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* Identify ICMPv6 handler
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*
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* @v type ICMPv6 type
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* @ret handler ICMPv6 handler, or NULL if not found
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*/
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static struct icmpv6_handler * icmpv6_handler ( unsigned int type ) {
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struct icmpv6_handler *handler;
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for_each_table_entry ( handler, ICMPV6_HANDLERS ) {
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if ( handler->type == type )
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return handler;
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}
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return NULL;
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}
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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 icmpv6_rx ( struct io_buffer *iobuf, struct net_device *netdev,
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struct sockaddr_tcpip *st_src,
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struct sockaddr_tcpip *st_dest, uint16_t pshdr_csum ) {
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struct sockaddr_in6 *sin6_src = ( ( struct sockaddr_in6 * ) st_src );
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struct sockaddr_in6 *sin6_dest = ( ( struct sockaddr_in6 * ) st_dest );
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struct icmp_header *icmp = iobuf->data;
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size_t len = iob_len ( iobuf );
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struct icmpv6_handler *handler;
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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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DBGC ( netdev, "ICMPv6 packet too short at %zd bytes (min %zd "
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"bytes)\n", 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_continue_chksum ( pshdr_csum, icmp, len );
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if ( csum != 0 ) {
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DBGC ( netdev, "ICMPv6 checksum incorrect (is %04x, should be "
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"0000)\n", csum );
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DBGC_HDA ( netdev, 0, icmp, len );
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rc = -EINVAL;
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goto done;
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}
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/* Identify handler */
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handler = icmpv6_handler ( icmp->type );
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if ( ! handler ) {
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switch ( icmp->type ) {
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case ICMPV6_DESTINATION_UNREACHABLE:
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rc = -EHOSTUNREACH_CODE ( icmp->code );
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break;
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case ICMPV6_PACKET_TOO_BIG:
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rc = -ERANGE;
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break;
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case ICMPV6_TIME_EXCEEDED:
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rc = -ETIMEDOUT_CODE ( icmp->code );
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break;
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case ICMPV6_PARAMETER_PROBLEM:
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rc = -EPROTO_CODE ( icmp->code );
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break;
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default:
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DBGC ( netdev, "ICMPv6 unrecognised type %d code %d\n",
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icmp->type, icmp->code );
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rc = -ENOTSUP;
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break;
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};
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goto done;
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}
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/* Pass to handler */
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if ( ( rc = handler->rx ( iob_disown ( iobuf ), netdev, sin6_src,
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sin6_dest ) ) != 0 ) {
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DBGC ( netdev, "ICMPv6 could not handle type %d: %s\n",
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icmp->type, 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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/** ICMPv6 TCP/IP protocol */
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struct tcpip_protocol icmpv6_protocol __tcpip_protocol = {
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.name = "ICMPv6",
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.rx = icmpv6_rx,
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.tcpip_proto = IP_ICMP6,
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};
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/** ICMPv6 echo protocol */
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struct icmp_echo_protocol icmpv6_echo_protocol __icmp_echo_protocol = {
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.family = AF_INET6,
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.request = ICMPV6_ECHO_REQUEST,
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.reply = ICMPV6_ECHO_REPLY,
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.tcpip_protocol = &icmpv6_protocol,
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.net_checksum = 1,
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};
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