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[/] [openrisc/] [trunk/] [rtos/] [ecos-2.0/] [packages/] [redboot/] [v2_0/] [src/] [net/] [ip.c] - Rev 256
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//========================================================================== // // net/ip.c // // Stand-alone IP 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. // 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> #ifndef CYGDAT_REDBOOT_DEFAULT_IP_ADDR # define CYGDAT_REDBOOT_DEFAULT_IP_ADDR 0, 0, 0, 0 #endif #ifndef CYGDAT_REDBOOT_DEFAULT_IP_ADDR_MASK # define CYGDAT_REDBOOT_DEFAULT_IP_ADDR_MASK 255, 255, 255, 0 #endif #ifndef CYGDAT_REDBOOT_DEFAULT_GATEWAY_IP_ADDR # define CYGDAT_REDBOOT_DEFAULT_GATEWAY_IP_ADDR 0, 0, 0, 0 #endif ip_addr_t __local_ip_addr = { CYGDAT_REDBOOT_DEFAULT_IP_ADDR }; #ifdef CYGSEM_REDBOOT_NETWORKING_USE_GATEWAY ip_addr_t __local_ip_mask = { CYGDAT_REDBOOT_DEFAULT_IP_ADDR_MASK }; ip_addr_t __local_ip_gate = { CYGDAT_REDBOOT_DEFAULT_GATEWAY_IP_ADDR }; #endif static word ip_ident; #ifdef CYGSEM_REDBOOT_NETWORKING_USE_GATEWAY /* * See if an address is on the local network */ int __ip_addr_local(ip_addr_t *addr) { return !( ((__local_ip_addr[0] ^ (*addr)[0]) & __local_ip_mask[0]) | ((__local_ip_addr[1] ^ (*addr)[1]) & __local_ip_mask[1]) | ((__local_ip_addr[2] ^ (*addr)[2]) & __local_ip_mask[2]) | ((__local_ip_addr[3] ^ (*addr)[3]) & __local_ip_mask[3])); } #endif /* * Match given IP address to our address. * Check for broadcast matches as well. */ static int ip_addr_match(ip_addr_t addr) { if (addr[0] == 255 && addr[1] == 255 && addr[2] == 255 && addr[3] == 255) return 1; if (!memcmp(addr, __local_ip_addr, sizeof(ip_addr_t))) return 1; /* * Consider it an address match if we haven't gotten our IP address yet. * Some DHCP servers will address IP packets to the assigned address * instead of a IP broadcast address. */ if (__local_ip_addr[0] == 0 && __local_ip_addr[1] == 0 && __local_ip_addr[2] == 0 && __local_ip_addr[3] == 0) return 1; return 0; } extern void __tcp_handler(pktbuf_t *, ip_route_t *); /* * Handle IP packets coming from the polled ethernet interface. */ void __ip_handler(pktbuf_t *pkt, enet_addr_t *src_enet_addr) { ip_header_t *ip = pkt->ip_hdr; ip_route_t r; int hdr_bytes; /* first make sure its ours and has a good checksum. */ if (!ip_addr_match(ip->destination) || __sum((word *)ip, ip->hdr_len << 2, 0) != 0) { __pktbuf_free(pkt); return; } memcpy(r.ip_addr, ip->source, sizeof(ip_addr_t)); memcpy(r.enet_addr, src_enet_addr, sizeof(enet_addr_t)); hdr_bytes = ip->hdr_len << 2; pkt->pkt_bytes = ntohs(ip->length) - hdr_bytes; switch (ip->protocol) { #if NET_SUPPORT_ICMP case IP_PROTO_ICMP: pkt->icmp_hdr = (icmp_header_t *)(((char *)ip) + hdr_bytes); __icmp_handler(pkt, &r); break; #endif #if NET_SUPPORT_TCP case IP_PROTO_TCP: pkt->tcp_hdr = (tcp_header_t *)(((char *)ip) + hdr_bytes); __tcp_handler(pkt, &r); break; #endif #if NET_SUPPORT_UDP case IP_PROTO_UDP: pkt->udp_hdr = (udp_header_t *)(((char *)ip) + hdr_bytes); __udp_handler(pkt, &r); break; #endif default: __pktbuf_free(pkt); break; } } /* * Send an IP packet. * * The IP data field should contain pkt->pkt_bytes of data. * pkt->[udp|tcp|icmp]_hdr points to the IP data field. Any * IP options are assumed to be already in place in the IP * options field. */ int __ip_send(pktbuf_t *pkt, int protocol, ip_route_t *dest) { ip_header_t *ip = pkt->ip_hdr; int hdr_bytes; unsigned short cksum; /* * Figure out header length. The use udp_hdr is * somewhat arbitrary, but works because it is * a union with other IP protocol headers. */ hdr_bytes = (((char *)pkt->udp_hdr) - ((char *)ip)); pkt->pkt_bytes += hdr_bytes; ip->version = 4; ip->hdr_len = hdr_bytes >> 2; ip->tos = 0; ip->length = htons(pkt->pkt_bytes); ip->ident = htons(ip_ident); ip_ident++; ip->fragment = 0; ip->ttl = 255; ip->ttl = 64; ip->protocol = protocol; ip->checksum = 0; memcpy(ip->source, __local_ip_addr, sizeof(ip_addr_t)); memcpy(ip->destination, dest->ip_addr, sizeof(ip_addr_t)); cksum = __sum((word *)ip, hdr_bytes, 0); ip->checksum = htons(cksum); __enet_send(pkt, &dest->enet_addr, ETH_TYPE_IP); return 0; }
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