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Full processing of ICMP packets (v4 and v6); NDP

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IPv4 header and pseudoheader
Basic preprocessing of IPv4 packets
This commit is contained in:
Michal Zima
2012-04-02 13:44:14 +02:00
parent 4b6a373019
commit 1196c33bee
8 changed files with 541 additions and 8 deletions
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70
src/ipv4.c Normal file
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/*
* WrapSix
* Copyright (C) 2008-2012 Michal Zima <xhire@mujmalysvet.cz>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <netinet/in.h> /* IPPROTO_* */
#include <stdio.h>
#include <string.h> /* memcmp */
#include "icmp.h"
#include "ipv4.h"
#include "wrapper.h"
int ipv4(struct s_ethernet *eth, char *packet)
{
struct s_ipv4 *ip;
char *payload;
unsigned short header_size;
unsigned short data_size;
/* load IP header */
ip = (struct s_ipv4 *) packet;
/* test if this packet belongs to us */
if (memcmp(&wrapsix_ipv4_addr, &ip->ip_dest, 4) != 0) {
printf("[Debug] [IPv4] This is unfamiliar packet\n");
return 1;
}
/* TODO: verify checksum */
/* compute sizes and get payload */
header_size = (ip->ver_hdrlen & 0x0f) * 4; /* # of 4 byte words */
data_size = htons(ip->len) - header_size;
payload = packet + header_size;
switch (ip->proto) {
case IPPROTO_TCP:
printf("[Debug] IPv4 Protocol: TCP\n");
/*ipv4_tcp(eth, ip, payload, data_size);*/
break;
case IPPROTO_UDP:
printf("[Debug] IPv4 Protocol: UDP\n");
/*ipv4_udp(eth, ip, payload, data_size);*/
break;
case IPPROTO_ICMP:
printf("[Debug] IPv4 Protocol: ICMP\n");
icmp_ipv4(eth, ip, payload, data_size);
break;
default:
printf("[Debug] IPv4 Protocol: unknown [%d/0x%x]\n",
ip->proto, ip->proto);
return 1;
}
return 0;
}