1 //==========================================================================
5 // Stand-alone ICMP networking support for RedBoot
7 //==========================================================================
8 //####ECOSGPLCOPYRIGHTBEGIN####
9 // -------------------------------------------
10 // This file is part of eCos, the Embedded Configurable Operating System.
11 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
13 // eCos is free software; you can redistribute it and/or modify it under
14 // the terms of the GNU General Public License as published by the Free
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17 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
18 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
19 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
22 // You should have received a copy of the GNU General Public License along
23 // with eCos; if not, write to the Free Software Foundation, Inc.,
24 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
26 // As a special exception, if other files instantiate templates or use macros
27 // or inline functions from this file, or you compile this file and link it
28 // with other works to produce a work based on this file, this file does not
29 // by itself cause the resulting work to be covered by the GNU General Public
30 // License. However the source code for this file must still be made available
31 // in accordance with section (3) of the GNU General Public License.
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34 // this file might be covered by the GNU General Public License.
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37 // at http://sources.redhat.com/ecos/ecos-license/
38 // -------------------------------------------
39 //####ECOSGPLCOPYRIGHTEND####
40 //==========================================================================
41 //#####DESCRIPTIONBEGIN####
44 // Contributors: gthomas
49 // This code is part of RedBoot (tm).
51 //####DESCRIPTIONEND####
53 //==========================================================================
58 * Handle ICMP packets.
60 static void default_icmp_handler(pktbuf_t *pkt, ip_route_t *dest);
62 static icmp_handler_t icmp_handler = default_icmp_handler;
65 * Install a user defined user_handler for incoming icmp packets.
66 * Returns zero if successful, -1 if the user_handler is already used.
69 __icmp_install_listener(icmp_handler_t user_handler)
71 if (icmp_handler == user_handler) {
74 icmp_handler = user_handler;
80 * Replace a user defined handler by the default handler.
83 __icmp_remove_listener(void)
85 if (icmp_handler != default_icmp_handler) {
86 icmp_handler = default_icmp_handler;
91 * ICMP entry point with an IP packet pkt and the destination dest a reply
95 __icmp_handler(pktbuf_t *pkt, ip_route_t *dest)
97 (*icmp_handler)(pkt, dest);
99 BSPLOG(bsp_log("icmp: dest[%s] type[%d] seq[%d]\n",
100 inet_ntoa(pkt->ip_hdr->destination),
102 pkt->icmp_hdr->seqnum));
108 * The default ICMP handler only handles ICMP incoming echo request and
109 * outgoing echo reply.
112 default_icmp_handler(pktbuf_t *pkt, ip_route_t *dest)
116 if (pkt->icmp_hdr->type == ICMP_TYPE_ECHOREQUEST
117 && pkt->icmp_hdr->code == 0
118 && __sum((word *)pkt->icmp_hdr, pkt->pkt_bytes, 0) == 0) {
120 pkt->icmp_hdr->type = ICMP_TYPE_ECHOREPLY;
121 pkt->icmp_hdr->checksum = 0;
122 cksum = __sum((word *)pkt->icmp_hdr, pkt->pkt_bytes, 0);
123 pkt->icmp_hdr->checksum = htons(cksum);
124 __ip_send(pkt, IP_PROTO_ICMP, dest);