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/* *********************************************************************
* Broadcom Common Firmware Environment (CFE)
*
* ICMP Protocol File: net_icmp.c
*
* This module implements portions of the ICMP protocol. Note
* that it is not a complete implementation, just enough to
* generate and respond to ICMP echo requests.
*
* Author: Mitch Lichtenberg (mpl@broadcom.com)
*
*********************************************************************
*
* Copyright 2000,2001,2002,2003
* Broadcom Corporation. All rights reserved.
*
* This software is furnished under license and may be used and
* copied only in accordance with the following terms and
* conditions. Subject to these conditions, you may download,
* copy, install, use, modify and distribute modified or unmodified
* copies of this software in source and/or binary form. No title
* or ownership is transferred hereby.
*
* 1) Any source code used, modified or distributed must reproduce
* and retain this copyright notice and list of conditions
* as they appear in the source file.
*
* 2) No right is granted to use any trade name, trademark, or
* logo of Broadcom Corporation. The "Broadcom Corporation"
* name may not be used to endorse or promote products derived
* from this software without the prior written permission of
* Broadcom Corporation.
*
* 3) THIS SOFTWARE IS PROVIDED "AS-IS" AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING BUT NOT LIMITED TO, ANY IMPLIED
* WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
* PURPOSE, OR NON-INFRINGEMENT ARE DISCLAIMED. IN NO EVENT
* SHALL BROADCOM BE LIABLE FOR ANY DAMAGES WHATSOEVER, AND IN
* PARTICULAR, BROADCOM SHALL NOT BE LIABLE FOR DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
* TORT (INCLUDING NEGLIGENCE OR OTHERWISE), EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
********************************************************************* */
#include "lib_types.h"
#include "lib_string.h"
#include "lib_queue.h"
#include "lib_malloc.h"
#include "lib_printf.h"
#include "cfe_timer.h"
#include "net_ebuf.h"
#include "net_ether.h"
#include "net_ip.h"
/* *********************************************************************
* Constants
********************************************************************* */
#define ICMP_CODE_ECHO 0
#define ICMP_TYPE_ECHOREPLY 0
#define ICMP_TYPE_ECHOREQ 8
#define ICMPMSG(type,code) (((type)<<8)|(code))
/* *********************************************************************
* Structures
********************************************************************* */
struct icmp_info_s {
ip_info_t *icmp_ipinfo;
queue_t icmp_echoreplies;
int icmp_maxreplies;
};
/* *********************************************************************
* ICMP_RX_CALLBACK(ref,buf,dst,src)
*
* This routine is called by the IP layer when we receive
* ICMP protocol messages.
*
* Input parameters:
* ref - reference data (an icmp_info_t)
* buf - the ebuf containing the buffer
* dst - destination IP address (us, usually)
* src - source IP address
*
* Return value:
* ETH_KEEP to keep packet, ETH_DROP to cause packet to be freed
********************************************************************* */
static int icmp_rx_callback(void *ref,ebuf_t *buf,uint8_t *dst,uint8_t *src)
{
icmp_info_t *icmp = (icmp_info_t *)ref;
ip_info_t *ipi = icmp->icmp_ipinfo;
uint16_t imsg;
uint16_t cksum;
ebuf_t *txbuf;
uint8_t *icmphdr;
int res;
imsg = ICMPMSG(buf->eb_ptr[0],buf->eb_ptr[1]);
res = ETH_DROP; /* assume we're dropping the pkt */
switch (imsg) {
case ICMPMSG(ICMP_TYPE_ECHOREQ,ICMP_CODE_ECHO):
txbuf = _ip_alloc(ipi);
if (txbuf) {
/* Construct reply from the original packet. */
icmphdr = txbuf->eb_ptr;
ebuf_append_bytes(txbuf,buf->eb_ptr,buf->eb_length);
icmphdr[0] = ICMP_TYPE_ECHOREPLY;
icmphdr[1] = ICMP_CODE_ECHO;
icmphdr[2] = 0; icmphdr[3] = 0;
cksum = ~ip_chksum(0,icmphdr,ebuf_length(txbuf));
icmphdr[2] = (cksum >> 8) & 0xFF;
icmphdr[3] = (cksum & 0xFF);
if (_ip_send(ipi,txbuf,src,IPPROTO_ICMP) < 0) {
_ip_free(ipi,txbuf);
}
}
break;
case ICMPMSG(ICMP_TYPE_ECHOREPLY,ICMP_CODE_ECHO):
if (q_count(&(icmp->icmp_echoreplies)) < icmp->icmp_maxreplies) {
/* We're keeping this packet, put it on the queue and don't
free it in the driver. */
q_enqueue(&(icmp->icmp_echoreplies),(queue_t *) buf);
res = ETH_KEEP;
}
break;
default:
res = ETH_DROP;
}
return res;
}
/* *********************************************************************
* _ICMP_INIT(ipi)
*
* Initialize the ICMP layer.
*
* Input parameters:
* ipi - ipinfo structure of IP layer to attach to
*
* Return value:
* icmp_info_t structure or NULL if error occurs
********************************************************************* */
icmp_info_t *_icmp_init(ip_info_t *ipi)
{
icmp_info_t *icmp;
icmp = (icmp_info_t *) KMALLOC(sizeof(icmp_info_t),0);
if (!icmp) return NULL;
icmp->icmp_ipinfo = ipi;
q_init(&(icmp->icmp_echoreplies));
icmp->icmp_maxreplies = 0;
_ip_register(ipi,IPPROTO_ICMP,icmp_rx_callback,icmp);
return icmp;
}
/* *********************************************************************
* _ICMP_UNINIT(icmp)
*
* Un-initialize the ICMP layer.
*
* Input parameters:
* icmp - icmp_info_t structure
*
* Return value:
* nothing
********************************************************************* */
void _icmp_uninit(icmp_info_t *icmp)
{
_ip_deregister(icmp->icmp_ipinfo,IPPROTO_ICMP);
KFREE(icmp);
}
int _icmp_ping(icmp_info_t *icmp,uint8_t *dest,int seq,int len)
{
return 0;
}
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