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skrzyp |
//==========================================================================
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//
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// net/icmp.c
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//
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// Stand-alone ICMP networking support for RedBoot
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//
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//==========================================================================
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// ####ECOSGPLCOPYRIGHTBEGIN####
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// -------------------------------------------
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// This file is part of eCos, the Embedded Configurable Operating System.
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// Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
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//
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// eCos is free software; you can redistribute it and/or modify it under
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// the terms of the GNU General Public License as published by the Free
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// Software Foundation; either version 2 or (at your option) any later
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// version.
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//
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// eCos is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// 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 eCos; if not, write to the Free Software Foundation, Inc.,
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// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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//
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// As a special exception, if other files instantiate templates or use
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// macros or inline functions from this file, or you compile this file
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// and link it with other works to produce a work based on this file,
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// this file does not by itself cause the resulting work to be covered by
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// the GNU General Public License. However the source code for this file
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// must still be made available in accordance with section (3) of the GNU
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// General Public License v2.
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//
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// This exception does not invalidate any other reasons why a work based
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// on this file might be covered by the GNU General Public License.
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// -------------------------------------------
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// ####ECOSGPLCOPYRIGHTEND####
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//==========================================================================
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//#####DESCRIPTIONBEGIN####
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//
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// Author(s): gthomas
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// Contributors: gthomas
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// Date: 2000-07-14
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// Purpose:
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// Description:
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//
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// This code is part of RedBoot (tm).
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//
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//####DESCRIPTIONEND####
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//
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//==========================================================================
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#include <net/net.h>
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/*
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* Handle ICMP packets.
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*/
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static void default_icmp_handler(pktbuf_t *pkt, ip_route_t *dest);
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static icmp_handler_t icmp_handler = default_icmp_handler;
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/*
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* Install a user defined user_handler for incoming icmp packets.
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* Returns zero if successful, -1 if the user_handler is already used.
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*/
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int
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__icmp_install_listener(icmp_handler_t user_handler)
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{
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if (icmp_handler == user_handler) {
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return -1;
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}
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icmp_handler = user_handler;
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return 0;
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}
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/*
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* Replace a user defined handler by the default handler.
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*/
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void
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__icmp_remove_listener(void)
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{
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if (icmp_handler != default_icmp_handler) {
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icmp_handler = default_icmp_handler;
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}
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}
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/*
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* ICMP entry point with an IP packet pkt and the destination dest a reply
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* should be sent to.
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*/
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void
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__icmp_handler(pktbuf_t *pkt, ip_route_t *dest)
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{
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(*icmp_handler)(pkt, dest);
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BSPLOG(bsp_log("icmp: dest[%s] type[%d] seq[%d]\n",
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inet_ntoa(pkt->ip_hdr->destination),
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pkt->icmp_hdr->type,
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pkt->icmp_hdr->seqnum));
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__pktbuf_free(pkt);
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}
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/*
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* The default ICMP handler only handles ICMP incoming echo request and
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* outgoing echo reply.
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*/
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static void
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default_icmp_handler(pktbuf_t *pkt, ip_route_t *dest)
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{
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word cksum;
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if (pkt->icmp_hdr->type == ICMP_TYPE_ECHOREQUEST
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&& pkt->icmp_hdr->code == 0
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&& __sum((word *)pkt->icmp_hdr, pkt->pkt_bytes, 0) == 0) {
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pkt->icmp_hdr->type = ICMP_TYPE_ECHOREPLY;
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pkt->icmp_hdr->checksum = 0;
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cksum = __sum((word *)pkt->icmp_hdr, pkt->pkt_bytes, 0);
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pkt->icmp_hdr->checksum = htons(cksum);
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__ip_send(pkt, IP_PROTO_ICMP, dest);
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}
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}
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