sysadmin/ipxe
1
0
Fork 0
mirror of https://github.com/ipxe/ipxe synced 2026-01-03 18:31:03 +03:00
Code Issues Packages Projects Releases Wiki Activity

[icmp] Add support for sending ICMP echo requests

Browse Source 
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;
}