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[icmp] Add support for sending ICMP echo requests

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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>
This commit is contained in:
Michael Brown
2013-10-21 14:10:07 +01:00
parent 12605efded
commit 5c2ffc26cc
9 changed files with 407 additions and 126 deletions
Download Patch File Download Diff File Expand all files Collapse all files

239
src/net/icmp.c
View File

@@ -1,5 +1,5 @@
/*
* Copyright (C) 2009 Michael Brown <mbrown@fensystems.co.uk>.
* 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
@@ -20,10 +20,13 @@
FILE_LICENCE ( GPL2_OR_LATER );
#include <string.h>
#include <byteswap.h>
#include <errno.h>
#include <ipxe/iobuf.h>
#include <ipxe/in.h>
#include <ipxe/tcpip.h>
#include <ipxe/ping.h>
#include <ipxe/crc32.h>
#include <ipxe/icmp.h>
/** @file
@@ -32,76 +35,192 @@ FILE_LICENCE ( GPL2_OR_LATER );
*
*/
struct tcpip_protocol icmp_protocol __tcpip_protocol;
/**
* Identify ICMP echo protocol
*
* @v st_family Address family
* @ret echo_protocol ICMP echo protocol, or NULL
*/
static struct icmp_echo_protocol * icmp_echo_protocol ( sa_family_t family ) {
struct icmp_echo_protocol *echo_protocol;
for_each_table_entry ( echo_protocol, ICMP_ECHO_PROTOCOLS ) {
if ( echo_protocol->family == family )
return echo_protocol;
}
return NULL;
}
/**
* Process a received packet
*
* Determine debugging colour for ICMP debug messages
*
* @v st_peer Peer address
* @ret col Debugging colour (for DBGC())
*/
static uint32_t icmpcol ( struct sockaddr_tcpip *st_peer ) {
return crc32_le ( 0, st_peer, sizeof ( *st_peer ) );
}
/**
* Transmit ICMP echo 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
* @v st_dest Destination socket address
* @v echo_protocol ICMP echo protocol
* @ret rc Return status code
*/
static int icmp_rx ( struct io_buffer *iobuf,
struct net_device *netdev __unused,
struct sockaddr_tcpip *st_src,
struct sockaddr_tcpip *st_dest,
uint16_t pshdr_csum __unused ) {
struct icmp_header *icmp = iobuf->data;
size_t len = iob_len ( iobuf );
unsigned int csum;
static int icmp_tx_echo ( struct io_buffer *iobuf,
struct sockaddr_tcpip *st_dest,
struct icmp_echo_protocol *echo_protocol ) {
struct icmp_echo *echo = iobuf->data;
int rc;
/* Set ICMP type and (re)calculate checksum */
echo->icmp.chksum = 0;
echo->icmp.chksum = tcpip_chksum ( echo, iob_len ( iobuf ) );
/* Transmit packet */
if ( ( rc = tcpip_tx ( iobuf, echo_protocol->tcpip_protocol, NULL,
st_dest, NULL,
( echo_protocol->net_checksum ?
&echo->icmp.chksum : NULL ) ) ) != 0 )
return rc;
return 0;
}
/**
* Transmit ICMP echo request
*
* @v iobuf I/O buffer
* @v st_dest Destination socket address
* @ret rc Return status code
*/
int icmp_tx_echo_request ( struct io_buffer *iobuf,
struct sockaddr_tcpip *st_dest ) {
struct icmp_echo *echo = iobuf->data;
struct icmp_echo_protocol *echo_protocol;
int rc;
/* Identify ICMP echo protocol */
echo_protocol = icmp_echo_protocol ( st_dest->st_family );
if ( ! echo_protocol ) {
DBGC ( icmpcol ( st_dest ), "ICMP TX echo request unknown "
"address family %d\n", st_dest->st_family );
free_iob ( iobuf );
return -ENOTSUP;
}
/* Set type */
echo->icmp.type = echo_protocol->request;
/* Transmit request */
DBGC ( icmpcol ( st_dest ), "ICMP TX echo request id %04x seq %04x\n",
ntohs ( echo->ident ), ntohs ( echo->sequence ) );
if ( ( rc = icmp_tx_echo ( iobuf, st_dest, echo_protocol ) ) != 0 )
return rc;
return 0;
}
/**
* Transmit ICMP echo reply
*
* @v iobuf I/O buffer
* @v st_dest Destination socket address
* @ret rc Return status code
*/
static int icmp_tx_echo_reply ( struct io_buffer *iobuf,
struct sockaddr_tcpip *st_dest,
struct icmp_echo_protocol *echo_protocol ) {
struct icmp_echo *echo = iobuf->data;
int rc;
/* Set type */
echo->icmp.type = echo_protocol->reply;
/* Transmit reply */
DBGC ( icmpcol ( st_dest ), "ICMP TX echo reply id %04x seq %04x\n",
ntohs ( echo->ident ), ntohs ( echo->sequence ) );
if ( ( rc = icmp_tx_echo ( iobuf, st_dest, echo_protocol ) ) != 0 )
return rc;
return 0;
}
/**
* Process a received ICMP echo request
*
* @v iobuf I/O buffer
* @v st_src Source socket address
* @v echo_protocol ICMP echo protocol
* @ret rc Return status code
*/
int icmp_rx_echo_request ( struct io_buffer *iobuf,
struct sockaddr_tcpip *st_src,
struct icmp_echo_protocol *echo_protocol ) {
struct icmp_echo *echo = iobuf->data;
int rc;
/* Sanity check */
if ( len < sizeof ( *icmp ) ) {
DBG ( "ICMP packet too short at %zd bytes (min %zd bytes)\n",
len, sizeof ( *icmp ) );
rc = -EINVAL;
goto done;
if ( iob_len ( iobuf ) < sizeof ( *echo ) ) {
DBGC ( icmpcol ( st_src ), "ICMP RX echo request too short at "
"%zd bytes (min %zd bytes)\n",
iob_len ( iobuf ), sizeof ( *echo ) );
free_iob ( iobuf );
return -EINVAL;
}
DBGC ( icmpcol ( st_src ), "ICMP RX echo request id %04x seq %04x\n",
ntohs ( echo->ident ), ntohs ( echo->sequence ) );
/* Verify checksum */
csum = tcpip_chksum ( icmp, len );
if ( csum != 0 ) {
DBG ( "ICMP checksum incorrect (is %04x, should be 0000)\n",
csum );
DBG_HD ( icmp, len );
rc = -EINVAL;
goto done;
}
/* Transmit echo reply */
if ( ( rc = icmp_tx_echo_reply ( iobuf, st_src, echo_protocol ) ) != 0 )
return rc;
/* We respond only to pings */
if ( icmp->type != ICMP_ECHO_REQUEST ) {
DBG ( "ICMP ignoring type %d\n", icmp->type );
rc = 0;
goto done;
}
DBG ( "ICMP responding to ping\n" );
/* Change type to response and recalculate checksum */
icmp->type = ICMP_ECHO_RESPONSE;
icmp->chksum = 0;
icmp->chksum = tcpip_chksum ( icmp, len );
/* Transmit the response */
if ( ( rc = tcpip_tx ( iob_disown ( iobuf ), &icmp_protocol, st_dest,
st_src, NULL, NULL ) ) != 0 ) {
DBG ( "ICMP could not transmit ping response: %s\n",
strerror ( rc ) );
goto done;
}
done:
free_iob ( iobuf );
return rc;
return 0;
}
/** ICMP TCP/IP protocol */
struct tcpip_protocol icmp_protocol __tcpip_protocol = {
.name = "ICMP",
.rx = icmp_rx,
.tcpip_proto = IP_ICMP,
};
/**
* Process a received ICMP echo request
*
* @v iobuf I/O buffer
* @v st_src Source socket address
* @ret rc Return status code
*/
int icmp_rx_echo_reply ( struct io_buffer *iobuf,
struct sockaddr_tcpip *st_src ) {
struct icmp_echo *echo = iobuf->data;
int rc;
/* Sanity check */
if ( iob_len ( iobuf ) < sizeof ( *echo ) ) {
DBGC ( icmpcol ( st_src ), "ICMP RX echo reply too short at "
"%zd bytes (min %zd bytes)\n",
iob_len ( iobuf ), sizeof ( *echo ) );
free_iob ( iobuf );
return -EINVAL;
}
DBGC ( icmpcol ( st_src ), "ICMP RX echo reply id %04x seq %04x\n",
ntohs ( echo->ident ), ntohs ( echo->sequence ) );
/* Deliver to ping protocol */
if ( ( rc = ping_rx ( iobuf, st_src ) ) != 0 )
return rc;
return 0;
}
/**
* Receive ping reply (when no ping protocol is present)
*
* @v iobuf I/O buffer
* @v st_src Source socket address
* @ret rc Return status code
*/
__weak int ping_rx ( struct io_buffer *iobuf,
struct sockaddr_tcpip *st_src __unused ) {
free_iob ( iobuf );
return 0;
}

109
src/net/icmpv4.c Normal file
View File

@@ -0,0 +1,109 @@
/*
* 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 <ipxe/iobuf.h>
#include <ipxe/in.h>
#include <ipxe/tcpip.h>
#include <ipxe/icmp.h>
/** @file
*
* ICMPv4 protocol
*
*/
struct icmp_echo_protocol icmpv4_echo_protocol __icmp_echo_protocol;
/**
* 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 icmpv4_rx ( struct io_buffer *iobuf,
struct net_device *netdev __unused,
struct sockaddr_tcpip *st_src,
struct sockaddr_tcpip *st_dest __unused,
uint16_t pshdr_csum __unused ) {
struct icmp_header *icmp = iobuf->data;
size_t len = iob_len ( iobuf );
unsigned int csum;
unsigned int type;
int rc;
/* Sanity check */
if ( len < sizeof ( *icmp ) ) {
DBG ( "ICMP packet too short at %zd bytes (min %zd bytes)\n",
len, sizeof ( *icmp ) );
rc = -EINVAL;
goto discard;
}
/* Verify checksum */
csum = tcpip_chksum ( icmp, len );
if ( csum != 0 ) {
DBG ( "ICMP checksum incorrect (is %04x, should be 0000)\n",
csum );
DBG_HD ( icmp, len );
rc = -EINVAL;
goto discard;
}
/* Handle ICMP packet */
type = icmp->type;
switch ( type ) {
case ICMP_ECHO_REQUEST:
return icmp_rx_echo_request ( iobuf, st_src,
&icmpv4_echo_protocol );
case ICMP_ECHO_REPLY:
return icmp_rx_echo_reply ( iobuf, st_src );
default:
DBG ( "ICMP ignoring type %d\n", type );
rc = 0;
break;
}
discard:
free_iob ( iobuf );
return rc;
}
/** ICMPv4 TCP/IP protocol */
struct tcpip_protocol icmpv4_protocol __tcpip_protocol = {
.name = "ICMPv4",
.rx = icmpv4_rx,
.tcpip_proto = IP_ICMP,
};
/** ICMPv4 echo protocol */
struct icmp_echo_protocol icmpv4_echo_protocol __icmp_echo_protocol = {
.family = AF_INET,
.request = ICMP_ECHO_REQUEST,
.reply = ICMP_ECHO_REPLY,
.tcpip_protocol = &icmpv4_protocol,
.net_checksum = 0,
};

85
src/net/icmpv6.c
View File

@@ -25,6 +25,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
#include <ipxe/in.h>
#include <ipxe/iobuf.h>
#include <ipxe/tcpip.h>
#include <ipxe/ping.h>
#include <ipxe/icmpv6.h>
/** @file
@@ -33,6 +34,8 @@ FILE_LICENCE ( GPL2_OR_LATER );
*
*/
struct icmp_echo_protocol icmpv6_echo_protocol __icmp_echo_protocol;
/**
* Process received ICMPv6 echo request packet
*
@@ -42,50 +45,45 @@ FILE_LICENCE ( GPL2_OR_LATER );
* @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 ) {
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 );
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;
return icmp_rx_echo_request ( iobuf, st_src, &icmpv6_echo_protocol );
}
/** ICMPv6 echo request handlers */
struct icmpv6_handler icmpv6_echo_handler __icmpv6_handler = {
/** ICMPv6 echo request handler */
struct icmpv6_handler icmpv6_echo_request_handler __icmpv6_handler = {
.type = ICMPV6_ECHO_REQUEST,
.rx = icmpv6_rx_echo,
.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,
};
/**
@@ -119,7 +117,7 @@ static int icmpv6_rx ( struct io_buffer *iobuf, struct net_device *netdev,
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;
struct icmp_header *icmp = iobuf->data;
size_t len = iob_len ( iobuf );
struct icmpv6_handler *handler;
unsigned int csum;
@@ -170,3 +168,12 @@ struct tcpip_protocol icmpv6_protocol __tcpip_protocol = {
.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,
};

4
src/net/ipv4.c
View File

@@ -669,5 +669,5 @@ struct settings_applicator ipv4_settings_applicator __settings_applicator = {
.apply = ipv4_create_routes,
};
/* Drag in ICMP */
REQUIRE_OBJECT ( icmp );
/* Drag in ICMPv4 */
REQUIRE_OBJECT ( icmpv4 );