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[/] [openrisc/] [trunk/] [rtos/] [ecos-2.0/] [packages/] [redboot/] [v2_0/] [src/] [net/] [icmp.c] - Rev 256
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//========================================================================== // // net/icmp.c // // Stand-alone ICMP networking support for RedBoot // //========================================================================== //####ECOSGPLCOPYRIGHTBEGIN#### // ------------------------------------------- // This file is part of eCos, the Embedded Configurable Operating System. // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc. // // eCos 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 or (at your option) any later version. // // eCos 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 eCos; if not, write to the Free Software Foundation, Inc., // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. // // As a special exception, if other files instantiate templates or use macros // or inline functions from this file, or you compile this file and link it // with other works to produce a work based on this file, this file does not // by itself cause the resulting work to be covered by the GNU General Public // License. However the source code for this file must still be made available // in accordance with section (3) of the GNU General Public License. // // This exception does not invalidate any other reasons why a work based on // this file might be covered by the GNU General Public License. // // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc. // at http://sources.redhat.com/ecos/ecos-license/ // ------------------------------------------- //####ECOSGPLCOPYRIGHTEND#### //========================================================================== //#####DESCRIPTIONBEGIN#### // // Author(s): gthomas // Contributors: gthomas // Date: 2000-07-14 // Purpose: // Description: // // This code is part of RedBoot (tm). // //####DESCRIPTIONEND#### // //========================================================================== #include <net/net.h> /* * Handle ICMP packets. */ static void default_icmp_handler(pktbuf_t *pkt, ip_route_t *dest); static icmp_handler_t icmp_handler = default_icmp_handler; /* * Install a user defined user_handler for incoming icmp packets. * Returns zero if successful, -1 if the user_handler is already used. */ int __icmp_install_listener(icmp_handler_t user_handler) { if (icmp_handler == user_handler) { return -1; } icmp_handler = user_handler; return 0; } /* * Replace a user defined handler by the default handler. */ void __icmp_remove_listener(void) { if (icmp_handler != default_icmp_handler) { icmp_handler = default_icmp_handler; } } /* * ICMP entry point with an IP packet pkt and the destination dest a reply * should be sent to. */ void __icmp_handler(pktbuf_t *pkt, ip_route_t *dest) { (*icmp_handler)(pkt, dest); BSPLOG(bsp_log("icmp: dest[%s] type[%d] seq[%d]\n", inet_ntoa(pkt->ip_hdr->destination), pkt->icmp_hdr->type, pkt->icmp_hdr->seqnum)); __pktbuf_free(pkt); } /* * The default ICMP handler only handles ICMP incoming echo request and * outgoing echo reply. */ static void default_icmp_handler(pktbuf_t *pkt, ip_route_t *dest) { word cksum; if (pkt->icmp_hdr->type == ICMP_TYPE_ECHOREQUEST && pkt->icmp_hdr->code == 0 && __sum((word *)pkt->icmp_hdr, pkt->pkt_bytes, 0) == 0) { pkt->icmp_hdr->type = ICMP_TYPE_ECHOREPLY; pkt->icmp_hdr->checksum = 0; cksum = __sum((word *)pkt->icmp_hdr, pkt->pkt_bytes, 0); pkt->icmp_hdr->checksum = htons(cksum); __ip_send(pkt, IP_PROTO_ICMP, dest); } }
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