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[/] [openrisc/] [trunk/] [rtos/] [ecos-2.0/] [packages/] [redboot/] [v2_0/] [src/] [net/] [arp.c] - Rev 256
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//========================================================================== // // net/arp.c // // Stand-alone ARP 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. // Copyright (C) 2002 Gary Thomas // // 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> static struct { int waiting; char *eth; char *ip; } arp_req; /* * Handle incoming ARP packets. */ void __arp_handler(pktbuf_t *pkt) { arp_header_t *arp = pkt->arp_hdr; int hw_type, protocol; /* * Only handle ethernet hardware and IP protocol. */ protocol = ntohs(arp->protocol); hw_type = ntohs(arp->hw_type); if ((hw_type == ARP_HW_ETHER) && (protocol == ETH_TYPE_IP)) { /* * Handle requests for our ethernet address. */ if (!memcmp(arp->target_ip, __local_ip_addr, 4)) { if (ntohs(arp->opcode) == ARP_REQUEST) { /* format response. */ arp->opcode = htons(ARP_REPLY); memcpy(arp->target_ip, arp->sender_ip, sizeof(ip_addr_t)); memcpy(arp->target_enet, arp->sender_enet, sizeof(enet_addr_t)); memcpy(arp->sender_ip, __local_ip_addr, sizeof(ip_addr_t)); memcpy(arp->sender_enet, __local_enet_addr, sizeof(enet_addr_t)); pkt->pkt_bytes = sizeof(arp_header_t); __enet_send(pkt, &arp->target_enet, ETH_TYPE_ARP); } else if (ntohs(arp->opcode) == ARP_REPLY && arp_req.waiting) { if (!memcmp(arp_req.ip, arp->sender_ip, sizeof(ip_addr_t))) { memcpy(arp_req.eth, arp->sender_enet, sizeof(enet_addr_t)); arp_req.waiting = 0; } } } } __pktbuf_free(pkt); } /* * Find the ethernet address of the machine with the given * ip address. * Return 0 and fills in 'eth_addr' if successful, * -1 if unsuccessful. */ int __arp_request(ip_addr_t *ip_addr, enet_addr_t *eth_addr) { pktbuf_t *pkt; arp_header_t *arp; unsigned long retry_start; enet_addr_t bcast_addr; int retry; // Special case request for self if (!memcmp(ip_addr, __local_ip_addr, 4)) { memcpy(eth_addr, __local_enet_addr, sizeof(enet_addr_t)); return 0; } /* just fail if can't get a buffer */ if ((pkt = __pktbuf_alloc(ARP_PKT_SIZE)) == NULL) return -1; arp = pkt->arp_hdr; arp->opcode = htons(ARP_REQUEST); arp->hw_type = htons(ARP_HW_ETHER); arp->protocol = htons(0x800); arp->hw_len = sizeof(enet_addr_t); arp->proto_len = sizeof(ip_addr_t); memcpy(arp->sender_ip, __local_ip_addr, sizeof(ip_addr_t)); memcpy(arp->sender_enet, __local_enet_addr, sizeof(enet_addr_t)); memcpy(arp->target_ip, ip_addr, sizeof(ip_addr_t)); bcast_addr[0] = 255; bcast_addr[1] = 255; bcast_addr[2] = 255; bcast_addr[3] = 255; bcast_addr[4] = 255; bcast_addr[5] = 255; arp_req.eth = (char *)eth_addr; arp_req.ip = (char *)ip_addr; arp_req.waiting = 1; retry = 8; while (retry-- > 0) { /* send the packet */ pkt->pkt_bytes = sizeof(arp_header_t); __enet_send(pkt, &bcast_addr, ETH_TYPE_ARP); retry_start = MS_TICKS(); while ((MS_TICKS_DELAY() - retry_start) < 250) { __enet_poll(); if (!arp_req.waiting) { __pktbuf_free(pkt); return 0; } } } __pktbuf_free(pkt); return -1; } #define NUM_ARP 16 static ip_route_t routes[NUM_ARP]; int __arp_lookup(ip_addr_t *host, ip_route_t *rt) { int i; static int next_arp = 0; for (i = 0; i < NUM_ARP; i++) { if (memcmp(host, &routes[i].ip_addr, sizeof(*host)) == 0) { // This is a known host memcpy(rt, &routes[i], sizeof(*rt)); return 0; } } memcpy(&rt->ip_addr, host, sizeof(*host)); if (((*host)[0] == 0xFF) && ((*host)[1] == 0xFF) && ((*host)[2] == 0xFF)) { memset(&rt->enet_addr, 0xFF, sizeof(&rt->enet_addr)); return 0; #ifdef CYGSEM_REDBOOT_NETWORKING_USE_GATEWAY } else if (!__ip_addr_local(host)) { // non-local IP address -- look up Gateway's Ethernet address host = &__local_ip_gate; #endif } if (__arp_request(host, &rt->enet_addr) < 0) { return -1; } else { memcpy(&routes[next_arp], rt, sizeof(*rt)); if (++next_arp == NUM_ARP) next_arp = 0; return 0; } }
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