mirror of
https://code.semirocket.science/wrapsix
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73 lines
2.0 KiB
C
73 lines
2.0 KiB
C
/*
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* WrapSix
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* Copyright (C) 2008-2012 Michal Zima <xhire@mujmalysvet.cz>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <netinet/in.h> /* IPPROTO_* */
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#include <stdio.h>
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#include <string.h> /* memcmp */
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#include "icmp.h"
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#include "ipv4.h"
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#include "tcp.h"
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#include "udp.h"
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#include "wrapper.h"
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int ipv4(struct s_ethernet *eth, char *packet)
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{
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struct s_ipv4 *ip;
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char *payload;
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unsigned short header_size;
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unsigned short data_size;
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/* load IP header */
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ip = (struct s_ipv4 *) packet;
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/* test if this packet belongs to us */
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if (memcmp(&wrapsix_ipv4_addr, &ip->ip_dest, 4) != 0) {
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printf("[Debug] [IPv4] This is unfamiliar packet\n");
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return 1;
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}
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/* TODO: verify checksum */
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/* compute sizes and get payload */
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header_size = (ip->ver_hdrlen & 0x0f) * 4; /* # of 4 byte words */
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data_size = htons(ip->len) - header_size;
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payload = packet + header_size;
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switch (ip->proto) {
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case IPPROTO_TCP:
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printf("[Debug] IPv4 Protocol: TCP\n");
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tcp_ipv4(eth, ip, payload, data_size);
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break;
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case IPPROTO_UDP:
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printf("[Debug] IPv4 Protocol: UDP\n");
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udp_ipv4(eth, ip, payload, data_size);
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break;
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case IPPROTO_ICMP:
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printf("[Debug] IPv4 Protocol: ICMP\n");
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icmp_ipv4(eth, ip, payload, data_size);
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break;
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default:
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printf("[Debug] IPv4 Protocol: unknown [%d/0x%x]\n",
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ip->proto, ip->proto);
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return 1;
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}
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return 0;
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}
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