mirror of
https://code.semirocket.science/wrapsix
synced 2024-11-27 00:20:59 +02:00
Migrate to static allocations
Use consistent types (char instead of unsigned char) ...and syntax too
This commit is contained in:
xHire
parent
b645beaae3
commit
e8924ec64e
19
src/arp.c
19
src/arp.c
@ -1,6 +1,6 @@
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/*
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* WrapSix
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* Copyright (C) 2008-2012 Michal Zima <xhire@mujmalysvet.cz>
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* Copyright (C) 2008-2017 xHire <xhire@wrapsix.org>
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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 General Public License as published by
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@ -18,14 +18,15 @@
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#include <net/ethernet.h> /* ETHERTYPE_* */
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#include <netinet/in.h> /* htons */
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#include <stdlib.h> /* malloc */
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#include <string.h> /* memcmp, memset */
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#include <string.h> /* memcmp */
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#include "arp.h"
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#include "log.h"
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#include "transmitter.h"
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#include "wrapper.h"
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#define ARP_PACKET_SIZE sizeof(struct s_ethernet) + sizeof(struct s_arp)
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/**
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* Process ARP packets and reply to them.
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*
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@ -39,7 +40,7 @@ int arp(struct s_ethernet *ethq, char *payload)
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{
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struct s_arp *arpq, *arpr; /* request and reply */
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struct s_ethernet *ethr;
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unsigned char *packet;
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char packet[ARP_PACKET_SIZE];
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arpq = (struct s_arp *) payload;
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@ -55,16 +56,6 @@ int arp(struct s_ethernet *ethq, char *payload)
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return 1;
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}
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/* compute the packet size */
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#define ARP_PACKET_SIZE sizeof(struct s_ethernet) + sizeof(struct s_arp)
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/* allocate enough memory */
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if ((packet = (unsigned char *) malloc(ARP_PACKET_SIZE)) == NULL) {
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log_error("Lack of free memory");
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return 1;
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}
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memset(packet, 0x0, ARP_PACKET_SIZE);
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/* define ethernet header and ARP offsets */
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ethr = (struct s_ethernet *) packet;
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arpr = (struct s_arp *) (packet + sizeof(struct s_ethernet));
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@ -1,6 +1,6 @@
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/*
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* WrapSix
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* Copyright (C) 2008-2013 Michal Zima <xhire@mujmalysvet.cz>
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* Copyright (C) 2008-2017 xHire <xhire@wrapsix.org>
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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 General Public License as published by
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@ -17,13 +17,13 @@
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*/
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#include <netinet/in.h> /* htonl */
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#include <stdlib.h> /* malloc */
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#include <string.h> /* memcpy */
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#include "checksum.h"
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#include "ipv4.h"
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#include "ipv6.h"
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#include "log.h"
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#include "wrapper.h"
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/**
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* General checksum computation function.
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@ -49,9 +49,9 @@ unsigned short checksum(const void *data, int length)
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}
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if (length) {
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unsigned char temp[2];
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char temp[2];
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temp[0] = *(unsigned char *) buf;
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temp[0] = *(char *) buf;
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temp[1] = 0;
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sum += *(unsigned short *) temp;
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@ -121,16 +121,10 @@ unsigned short checksum_update(unsigned short old_sum,
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unsigned short checksum_ipv4(struct s_ipv4_addr ip_src,
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struct s_ipv4_addr ip_dest,
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unsigned short length, unsigned char proto,
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unsigned char *payload)
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char *payload)
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{
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unsigned char *buffer;
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char buffer[PACKET_BUFFER];
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struct s_ipv4_pseudo *header;
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unsigned short sum;
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if ((buffer = malloc(sizeof(struct s_ipv4_pseudo) + length)) == NULL) {
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log_error("Lack of free memory");
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return 0;
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}
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header = (struct s_ipv4_pseudo *) buffer;
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@ -142,11 +136,7 @@ unsigned short checksum_ipv4(struct s_ipv4_addr ip_src,
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memcpy(buffer + sizeof(struct s_ipv4_pseudo), payload, (int) length);
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sum = checksum(buffer, sizeof(struct s_ipv4_pseudo) + (int) length);
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free(buffer);
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return sum;
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return checksum(buffer, sizeof(struct s_ipv4_pseudo) + (int) length);
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}
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/**
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@ -163,16 +153,10 @@ unsigned short checksum_ipv4(struct s_ipv4_addr ip_src,
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unsigned short checksum_ipv6(struct s_ipv6_addr ip_src,
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struct s_ipv6_addr ip_dest,
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unsigned short length, unsigned char proto,
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unsigned char *payload)
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char *payload)
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{
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unsigned char *buffer;
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char buffer[PACKET_BUFFER];
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struct s_ipv6_pseudo *header;
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unsigned short sum;
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if ((buffer = malloc(sizeof(struct s_ipv6_pseudo) + length)) == NULL) {
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log_error("Lack of free memory");
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return 0;
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}
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header = (struct s_ipv6_pseudo *) buffer;
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@ -184,11 +168,7 @@ unsigned short checksum_ipv6(struct s_ipv6_addr ip_src,
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memcpy(buffer + sizeof(struct s_ipv6_pseudo), payload, (int) length);
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sum = checksum(buffer, sizeof(struct s_ipv6_pseudo) + (int) length);
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free(buffer);
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return sum;
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return checksum(buffer, sizeof(struct s_ipv6_pseudo) + (int) length);
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}
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/**
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@ -1,6 +1,6 @@
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/*
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* WrapSix
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* Copyright (C) 2008-2012 Michal Zima <xhire@mujmalysvet.cz>
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* Copyright (C) 2008-2017 xHire <xhire@wrapsix.org>
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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 General Public License as published by
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@ -28,10 +28,10 @@ unsigned short checksum_update(unsigned short old_sum,
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unsigned short *new_data, short new_len);
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unsigned short checksum_ipv4(struct s_ipv4_addr ip_src,
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struct s_ipv4_addr ip_dest, unsigned short length,
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unsigned char proto, unsigned char *payload);
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unsigned char proto, char *payload);
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unsigned short checksum_ipv6(struct s_ipv6_addr ip_src,
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struct s_ipv6_addr ip_dest, unsigned short length,
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unsigned char proto, unsigned char *payload);
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unsigned char proto, char *payload);
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unsigned short checksum_ipv4_update(unsigned short old_sum,
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struct s_ipv6_addr ip6_src,
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struct s_ipv6_addr ip6_dest,
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182
src/icmp.c
182
src/icmp.c
@ -1,6 +1,6 @@
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/*
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* WrapSix
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* Copyright (C) 2008-2013 xHire <xhire@wrapsix.org>
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* Copyright (C) 2008-2017 xHire <xhire@wrapsix.org>
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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 General Public License as published by
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@ -18,7 +18,6 @@
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#include <net/ethernet.h> /* ETHERTYPE_* */
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#include <netinet/in.h> /* htons */
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#include <stdlib.h> /* malloc */
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#include <string.h> /* memcpy, memset */
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#include "checksum.h"
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@ -33,12 +32,12 @@
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#include "wrapper.h"
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/* declarations */
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int sub_icmp4_error(unsigned char *payload, unsigned short payload_size,
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unsigned char *packet, unsigned short *packet_len,
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int sub_icmp4_error(char *payload, unsigned short payload_size,
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char *packet, unsigned short *packet_len,
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struct s_icmp **icmp, struct s_nat **connection);
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int sub_icmp6_error(struct s_ethernet *eth6,
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unsigned char *payload, unsigned short payload_size,
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unsigned char *packet, unsigned short *packet_len,
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char *payload, unsigned short payload_size,
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char *packet, unsigned short *packet_len,
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struct s_icmp **icmp, struct s_nat **connection);
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/**
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@ -60,11 +59,11 @@ int icmp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4,
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struct s_icmp *icmp;
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unsigned int *icmp_extra;
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unsigned short *icmp_extra_s;
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unsigned char *icmp_extra_c;
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unsigned char *icmp_data;
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char *icmp_extra_c;
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char *icmp_data;
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struct s_nat *connection;
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unsigned short orig_checksum;
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unsigned char packet[PACKET_BUFFER];
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char packet[PACKET_BUFFER];
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unsigned short new_len = sizeof(struct s_ethernet) +
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sizeof(struct s_ipv6);
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@ -83,12 +82,12 @@ int icmp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4,
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}
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icmp = (struct s_icmp *) payload;
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icmp_data = (unsigned char *) (payload + sizeof(struct s_icmp));
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icmp_data = payload + sizeof(struct s_icmp);
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/* ICMP checksum recheck */
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orig_checksum = icmp->checksum;
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icmp->checksum = 0;
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icmp->checksum = checksum((unsigned char *) icmp, payload_size);
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icmp->checksum = checksum((char *) icmp, payload_size);
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if (icmp->checksum != orig_checksum) {
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/* packet is corrupted and shouldn't be processed */
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@ -120,13 +119,13 @@ int icmp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4,
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/* copy the payload data */
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if (payload_size < mtu - sizeof(struct s_ipv6)) {
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memcpy(&packet[new_len], payload, payload_size);
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icmp = (struct s_icmp *) &packet[new_len];
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memcpy(packet + new_len, payload, payload_size);
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icmp = (struct s_icmp *) (packet + new_len);
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new_len += payload_size;
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} else {
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memcpy(&packet[new_len], payload, mtu -
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memcpy(packet + new_len, payload, mtu -
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sizeof(struct s_ipv6));
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icmp = (struct s_icmp *) &packet[new_len];
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icmp = (struct s_icmp *) (packet + new_len);
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new_len += mtu - sizeof(struct s_ipv6);
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}
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@ -142,17 +141,17 @@ int icmp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4,
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}
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eip4 = (struct s_ipv4 *) (icmp_data + 4);
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eip6 = (struct s_ipv6 *) &packet[
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eip6 = (struct s_ipv6 *) (packet +
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sizeof(struct s_ethernet) +
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sizeof(struct s_ipv6) +
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sizeof(struct s_icmp) + 4];
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sizeof(struct s_icmp) + 4);
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/* translate ICMP type&code */
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if (icmp->code == 2) {
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icmp->type = ICMPV6_PARAM_PROBLEM;
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icmp->code = 1;
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icmp_extra = (unsigned int *)
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(((unsigned char *) icmp) +
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((char *) icmp +
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sizeof(struct s_icmp));
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if (eip6->next_header ==
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IPPROTO_FRAGMENT) {
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@ -166,10 +165,10 @@ int icmp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4,
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icmp->type = ICMPV6_PKT_TOO_BIG;
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icmp->code = 0;
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icmp_extra = (unsigned int *)
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(((unsigned char *) icmp) +
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((char *) icmp +
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sizeof(struct s_icmp));
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icmp_extra_s = (unsigned short *)
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(((unsigned char *) icmp) +
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((char *) icmp +
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sizeof(struct s_icmp) + 2);
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if (ntohs(*icmp_extra_s) < 68) {
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*icmp_extra = htonl(
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@ -240,9 +239,9 @@ int icmp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4,
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if (icmp->code == 0 || icmp->code == 2) {
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/* update the extra field */
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icmp_extra = (unsigned int *)
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(((unsigned char *) icmp) +
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((char *) icmp +
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sizeof(struct s_icmp));
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icmp_extra_c = (unsigned char *) icmp_extra;
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icmp_extra_c = (char *) icmp_extra;
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switch (*icmp_extra_c) {
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case 0:
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case 1:
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@ -306,7 +305,7 @@ int icmp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4,
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}
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eth6 = (struct s_ethernet *) packet;
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ip6 = (struct s_ipv6 *) &packet[sizeof(struct s_ethernet)];
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ip6 = (struct s_ipv6 *) (packet + sizeof(struct s_ethernet));
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/* build ethernet header */
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eth6->dest = connection->mac;
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@ -329,7 +328,7 @@ int icmp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4,
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icmp->checksum = checksum_ipv6(ip6->ip_src, ip6->ip_dest, new_len -
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sizeof(struct s_ethernet) -
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sizeof(struct s_ipv6), IPPROTO_ICMPV6,
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(unsigned char *) icmp);
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(char *) icmp);
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/* send translated packet */
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transmit_raw(packet, new_len);
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@ -353,12 +352,12 @@ int icmp_ipv6(struct s_ethernet *eth6, struct s_ipv6 *ip6, char *payload)
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struct s_icmp *icmp;
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unsigned int *icmp_extra;
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unsigned short *icmp_extra_s;
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unsigned char *icmp_extra_c;
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unsigned char *icmp_data;
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char *icmp_extra_c;
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char *icmp_data;
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struct s_nat *connection;
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unsigned short orig_checksum;
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unsigned short payload_size;
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unsigned char packet[PACKET_BUFFER - sizeof(struct s_ethernet)];
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char packet[PACKET_BUFFER - sizeof(struct s_ethernet)];
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unsigned short new_len = sizeof(struct s_ipv4);
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struct s_icmp_echo *echo;
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@ -374,14 +373,14 @@ int icmp_ipv6(struct s_ethernet *eth6, struct s_ipv6 *ip6, char *payload)
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}
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icmp = (struct s_icmp *) payload;
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icmp_data = (unsigned char *) (payload + sizeof(struct s_icmp));
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icmp_data = payload + sizeof(struct s_icmp);
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/* checksum recheck */
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orig_checksum = icmp->checksum;
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icmp->checksum = 0;
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icmp->checksum = checksum_ipv6(ip6->ip_src, ip6->ip_dest,
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payload_size, IPPROTO_ICMPV6,
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(unsigned char *) icmp);
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(char *) icmp);
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if (icmp->checksum != orig_checksum) {
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/* packet is corrupted and shouldn't be processed */
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@ -418,17 +417,18 @@ int icmp_ipv6(struct s_ethernet *eth6, struct s_ipv6 *ip6, char *payload)
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/* override information in original ICMP header */
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icmp->type = ICMPV4_ECHO_REQUEST;
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icmp = (struct s_icmp *) (packet + new_len);
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/* copy the payload data */
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/* IPv6 node can handle too big packets itself */
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if (payload_size < 1500 - sizeof(struct s_ipv4)) {
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memcpy(&packet[new_len], payload, payload_size);
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icmp = (struct s_icmp *) &packet[new_len];
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memcpy(icmp, payload, payload_size);
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new_len += payload_size;
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} else {
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memcpy(&packet[new_len], payload, 1500 -
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sizeof(struct s_ipv4));
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icmp = (struct s_icmp *) &packet[new_len];
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new_len += 1500 - sizeof(struct s_ipv4);
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memcpy(icmp, payload,
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1500 - sizeof(struct s_ipv4));
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/* before new_len was only the size of s_ipv4 */
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new_len = 1500;
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}
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break;
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@ -497,9 +497,9 @@ int icmp_ipv6(struct s_ethernet *eth6, struct s_ipv6 *ip6, char *payload)
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/* update the extra field */
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icmp_extra = (unsigned int *)
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(((unsigned char *) icmp) +
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((char *) icmp +
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sizeof(struct s_icmp));
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icmp_extra_c = (unsigned char *) icmp_extra;
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icmp_extra_c = (char *) icmp_extra;
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switch (*icmp_extra) {
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case 0:
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case 1:
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@ -572,11 +572,9 @@ int icmp_ipv6(struct s_ethernet *eth6, struct s_ipv6 *ip6, char *payload)
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icmp->code = 4;
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icmp_extra = (unsigned int *)
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(((unsigned char *) icmp) +
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sizeof(struct s_icmp));
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((char *) icmp + sizeof(struct s_icmp));
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icmp_extra_s = (unsigned short *)
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(((unsigned char *) icmp) +
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sizeof(struct s_icmp) + 2);
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((char *) icmp + sizeof(struct s_icmp) + 2);
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if (eip6->next_header != IPPROTO_FRAGMENT) {
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*icmp_extra_s = htons(ntohl(*icmp_extra) - 20);
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} else {
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@ -617,13 +615,12 @@ int icmp_ipv6(struct s_ethernet *eth6, struct s_ipv6 *ip6, char *payload)
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/* compute ICMP checksum */
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icmp->checksum = 0x0;
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icmp->checksum = checksum((unsigned char *) icmp, new_len -
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icmp->checksum = checksum((char *) icmp, new_len -
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sizeof(struct s_ipv4));
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/* compute IPv4 checksum */
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ip4->checksum = checksum_ipv4(ip4->ip_src, ip4->ip_dest,
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new_len, IPPROTO_ICMP,
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(unsigned char *) icmp);
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new_len, IPPROTO_ICMP, (char *) icmp);
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/* send translated packet */
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transmit_ipv4(&ip4->ip_dest, packet, new_len);
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@ -644,7 +641,7 @@ int icmp_ipv6(struct s_ethernet *eth6, struct s_ipv6 *ip6, char *payload)
|
||||
int icmp_ndp(struct s_ethernet *ethq, struct s_ipv6 *ipq,
|
||||
struct s_icmp_ndp_ns *ndp_ns)
|
||||
{
|
||||
unsigned char *packet;
|
||||
char packet[PACKET_BUFFER];
|
||||
struct s_ethernet *ethr;
|
||||
struct s_ipv6 *ipr;
|
||||
struct s_icmp *icmp;
|
||||
@ -655,15 +652,11 @@ int icmp_ndp(struct s_ethernet *ethq, struct s_ipv6 *ipq,
|
||||
return 1;
|
||||
}
|
||||
|
||||
/* allocate memory for reply packet */
|
||||
/* prepare memory for reply packet */
|
||||
#define NDP_PACKET_SIZE sizeof(struct s_ethernet) + \
|
||||
sizeof(struct s_ipv6) + \
|
||||
sizeof(struct s_icmp) + \
|
||||
sizeof(struct s_icmp_ndp_na)
|
||||
if ((packet = (unsigned char *) malloc(NDP_PACKET_SIZE)) == NULL) {
|
||||
log_error("Lack of free memory");
|
||||
return 1;
|
||||
}
|
||||
memset(packet, 0x0, NDP_PACKET_SIZE);
|
||||
|
||||
/* divide reply packet into parts */
|
||||
@ -703,14 +696,11 @@ int icmp_ndp(struct s_ethernet *ethq, struct s_ipv6 *ipq,
|
||||
/* compute ICMP checksum */
|
||||
icmp->checksum = checksum_ipv6(ipr->ip_src, ipr->ip_dest,
|
||||
htons(ipr->len), IPPROTO_ICMPV6,
|
||||
(unsigned char *) icmp);
|
||||
(char *) icmp);
|
||||
|
||||
/* send NDP reply */
|
||||
transmit_raw(packet, NDP_PACKET_SIZE);
|
||||
|
||||
/* clean-up */
|
||||
free(packet);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
@ -727,9 +717,10 @@ int icmp_ndp(struct s_ethernet *ethq, struct s_ipv6 *ipq,
|
||||
* @return 1 for failure
|
||||
*/
|
||||
int icmp4_error(struct s_ipv4_addr ip_dest, unsigned char type,
|
||||
unsigned char code, unsigned char *data, unsigned short length)
|
||||
unsigned char code, char *data, unsigned short length)
|
||||
{
|
||||
unsigned char *packet, *payload;
|
||||
char packet[PACKET_BUFFER];
|
||||
char *payload;
|
||||
unsigned int *unused;
|
||||
struct s_ipv4 *ip4;
|
||||
struct s_icmp *icmp;
|
||||
@ -740,18 +731,11 @@ int icmp4_error(struct s_ipv4_addr ip_dest, unsigned char type,
|
||||
1500 - sizeof(struct s_ipv4) - sizeof(struct s_icmp) - 4 :
|
||||
length;
|
||||
|
||||
if ((packet = (unsigned char *) malloc(sizeof(struct s_ipv4) +
|
||||
sizeof(struct s_icmp) + 4 + payload_size)) == NULL) {
|
||||
log_error("Lack of free memory");
|
||||
return 1;
|
||||
}
|
||||
|
||||
ip4 = (struct s_ipv4 *) packet;
|
||||
icmp = (struct s_icmp *) (packet + sizeof(struct s_ipv4));
|
||||
unused = (unsigned int *) (packet + sizeof(struct s_ipv4) +
|
||||
sizeof(struct s_icmp));
|
||||
payload = (unsigned char *) (packet + sizeof(struct s_ipv4) +
|
||||
sizeof(struct s_icmp) + 4);
|
||||
payload = packet + sizeof(struct s_ipv4) + sizeof(struct s_icmp) + 4;
|
||||
|
||||
/* build IPv4 packet */
|
||||
ip4->ver_hdrlen = 0x45; /* ver 4, header length 20 B */
|
||||
@ -777,20 +761,17 @@ int icmp4_error(struct s_ipv4_addr ip_dest, unsigned char type,
|
||||
memcpy(payload, data, payload_size);
|
||||
|
||||
/* compute ICMP checksum */
|
||||
icmp->checksum = checksum((unsigned char *) icmp,
|
||||
icmp->checksum = checksum((char *) icmp,
|
||||
payload_size + 4 + sizeof(struct s_icmp));
|
||||
|
||||
/* compute IPv4 checksum */
|
||||
ip4->checksum = checksum_ipv4(ip4->ip_src, ip4->ip_dest,
|
||||
htons(ip4->len), IPPROTO_ICMP,
|
||||
(unsigned char *) icmp);
|
||||
(char *) icmp);
|
||||
|
||||
/* send packet */
|
||||
transmit_ipv4(&ip4->ip_dest, packet, htons(ip4->len));
|
||||
|
||||
/* clean-up */
|
||||
free(packet);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
@ -808,10 +789,11 @@ int icmp4_error(struct s_ipv4_addr ip_dest, unsigned char type,
|
||||
* @return 1 for failure
|
||||
*/
|
||||
int icmp6_error(struct s_mac_addr mac_dest, struct s_ipv6_addr ip_dest,
|
||||
unsigned char type, unsigned char code, unsigned char *data,
|
||||
unsigned char type, unsigned char code, char *data,
|
||||
unsigned short length)
|
||||
{
|
||||
unsigned char *packet, *payload;
|
||||
char packet[PACKET_BUFFER];
|
||||
char *payload;
|
||||
unsigned int *unused;
|
||||
struct s_ethernet *eth;
|
||||
struct s_ipv6 *ip6;
|
||||
@ -824,13 +806,6 @@ int icmp6_error(struct s_mac_addr mac_dest, struct s_ipv6_addr ip_dest,
|
||||
1280 - sizeof(struct s_ipv6) - sizeof(struct s_icmp) - 4 :
|
||||
length;
|
||||
|
||||
if ((packet = (unsigned char *) malloc(sizeof(struct s_ethernet) +
|
||||
sizeof(struct s_ipv6) + sizeof(struct s_icmp) + 4 +
|
||||
payload_size)) == NULL) {
|
||||
log_error("Lack of free memory");
|
||||
return 1;
|
||||
}
|
||||
|
||||
eth = (struct s_ethernet *) packet;
|
||||
ip6 = (struct s_ipv6 *) (packet + sizeof(struct s_ethernet));
|
||||
icmp = (struct s_icmp *) (packet + sizeof(struct s_ethernet) +
|
||||
@ -838,9 +813,8 @@ int icmp6_error(struct s_mac_addr mac_dest, struct s_ipv6_addr ip_dest,
|
||||
unused = (unsigned int *) (packet + sizeof(struct s_ethernet) +
|
||||
sizeof(struct s_ipv6) +
|
||||
sizeof(struct s_icmp));
|
||||
payload = (unsigned char *) (packet + sizeof(struct s_ethernet) +
|
||||
sizeof(struct s_ipv6) +
|
||||
sizeof(struct s_icmp) + 4);
|
||||
payload = packet + sizeof(struct s_ethernet) + sizeof(struct s_ipv6) +
|
||||
sizeof(struct s_icmp) + 4;
|
||||
|
||||
/* ethernet */
|
||||
eth->dest = mac_dest;
|
||||
@ -869,16 +843,12 @@ int icmp6_error(struct s_mac_addr mac_dest, struct s_ipv6_addr ip_dest,
|
||||
/* compute ICMP checksum */
|
||||
icmp->checksum = checksum_ipv6(host_ipv6_addr, ip_dest,
|
||||
sizeof(struct s_icmp) + 4 + payload_size,
|
||||
IPPROTO_ICMPV6,
|
||||
(unsigned char *) icmp);
|
||||
IPPROTO_ICMPV6, (char *) icmp);
|
||||
|
||||
/* send packet */
|
||||
transmit_raw(packet, sizeof(struct s_ethernet) + sizeof(struct s_ipv6) +
|
||||
sizeof(struct s_icmp) + 4 + payload_size);
|
||||
|
||||
/* clean-up */
|
||||
free(packet);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
@ -895,8 +865,8 @@ int icmp6_error(struct s_mac_addr mac_dest, struct s_ipv6_addr ip_dest,
|
||||
* @return 0 for success
|
||||
* @return 1 for failure
|
||||
*/
|
||||
int sub_icmp4_error(unsigned char *payload, unsigned short payload_size,
|
||||
unsigned char *packet, unsigned short *packet_len,
|
||||
int sub_icmp4_error(char *payload, unsigned short payload_size,
|
||||
char *packet, unsigned short *packet_len,
|
||||
struct s_icmp **icmp, struct s_nat **connection)
|
||||
{
|
||||
struct s_ipv4 *eip4;
|
||||
@ -932,8 +902,8 @@ int sub_icmp4_error(unsigned char *payload, unsigned short payload_size,
|
||||
|
||||
/* define new inner IPv6 header */
|
||||
/* new_len+4+4+40=102 < 1280 */
|
||||
eip6 = (struct s_ipv6 *) &packet[*packet_len + sizeof(struct s_icmp) +
|
||||
4];
|
||||
eip6 = (struct s_ipv6 *) (packet + *packet_len + sizeof(struct s_icmp) +
|
||||
4);
|
||||
/* we'll need this right now */
|
||||
ipv4_to_ipv6(&eip4->ip_dest, &eip6->ip_dest);
|
||||
|
||||
@ -1016,8 +986,8 @@ int sub_icmp4_error(unsigned char *payload, unsigned short payload_size,
|
||||
}
|
||||
|
||||
/* copy ICMP header to new packet */
|
||||
memcpy(&packet[*packet_len], *icmp, sizeof(struct s_icmp) + 4);
|
||||
*icmp = (struct s_icmp *) &packet[*packet_len];
|
||||
memcpy(packet + *packet_len, *icmp, sizeof(struct s_icmp) + 4);
|
||||
*icmp = (struct s_icmp *) (packet + *packet_len);
|
||||
|
||||
/* complete inner IPv6 header */
|
||||
eip6->ver = 0x60 | (eip4->tos >> 4);
|
||||
@ -1035,7 +1005,7 @@ int sub_icmp4_error(unsigned char *payload, unsigned short payload_size,
|
||||
|
||||
/* was the IPv4 packet fragmented? */
|
||||
if (ntohs(eip4->flags_offset) & 0x1fff) {
|
||||
eip6_frag = (struct s_ipv6_fragment *) &packet[*packet_len];
|
||||
eip6_frag = (struct s_ipv6_fragment *) (packet + *packet_len);
|
||||
|
||||
if (ntohs(eip4->flags_offset) & IPV4_FLAG_MORE_FRAGMENTS) {
|
||||
eip6_frag->offset_flag = htons(((ntohs(eip4->
|
||||
@ -1052,8 +1022,8 @@ int sub_icmp4_error(unsigned char *payload, unsigned short payload_size,
|
||||
sizeof(struct s_ipv6_fragment));
|
||||
|
||||
eip6_frag->next_header = eip6->next_header;
|
||||
eip6->next_header = IPPROTO_FRAGMENT;
|
||||
eip6_frag->id = htonl(ntohs(eip4->id));
|
||||
eip6->next_header = IPPROTO_FRAGMENT;
|
||||
|
||||
*packet_len += sizeof(struct s_ipv6_fragment);
|
||||
} else {
|
||||
@ -1064,11 +1034,11 @@ int sub_icmp4_error(unsigned char *payload, unsigned short payload_size,
|
||||
/* we can afford to use full MTU instead of just 1280 B as admin
|
||||
* warrants this to us */
|
||||
if (payload_size > mtu + sizeof(struct s_ethernet) - *packet_len) {
|
||||
memcpy(&packet[*packet_len], payload,
|
||||
memcpy(packet + *packet_len, payload,
|
||||
mtu + sizeof(struct s_ethernet) - *packet_len);
|
||||
*packet_len = mtu;
|
||||
*packet_len = mtu + sizeof(struct s_ethernet);
|
||||
} else {
|
||||
memcpy(&packet[*packet_len], payload, payload_size);
|
||||
memcpy(packet + *packet_len, payload, payload_size);
|
||||
*packet_len += payload_size;
|
||||
}
|
||||
|
||||
@ -1090,8 +1060,8 @@ int sub_icmp4_error(unsigned char *payload, unsigned short payload_size,
|
||||
* @return 1 for failure
|
||||
*/
|
||||
int sub_icmp6_error(struct s_ethernet *eth6,
|
||||
unsigned char *payload, unsigned short payload_size,
|
||||
unsigned char *packet, unsigned short *packet_len,
|
||||
char *payload, unsigned short payload_size,
|
||||
char *packet, unsigned short *packet_len,
|
||||
struct s_icmp **icmp, struct s_nat **connection)
|
||||
{
|
||||
struct s_ipv4 *eip4;
|
||||
@ -1116,8 +1086,8 @@ int sub_icmp6_error(struct s_ethernet *eth6,
|
||||
|
||||
/* define new inner IPv4 header */
|
||||
/* new_len+4+4+20=48 < 576 */
|
||||
eip4 = (struct s_ipv4 *) &packet[*packet_len + sizeof(struct s_icmp) +
|
||||
4];
|
||||
eip4 = (struct s_ipv4 *) (packet + *packet_len + sizeof(struct s_icmp) +
|
||||
4);
|
||||
/* we'll need this right now */
|
||||
ipv6_to_ipv4(&eip6->ip_src, &eip4->ip_src);
|
||||
|
||||
@ -1247,8 +1217,8 @@ int sub_icmp6_error(struct s_ethernet *eth6,
|
||||
}
|
||||
|
||||
/* copy ICMP header to new packet */
|
||||
memcpy(&packet[*packet_len], *icmp, sizeof(struct s_icmp) + 4);
|
||||
*icmp = (struct s_icmp *) &packet[*packet_len];
|
||||
memcpy(packet + *packet_len, *icmp, sizeof(struct s_icmp) + 4);
|
||||
*icmp = (struct s_icmp *) (packet + *packet_len);
|
||||
|
||||
/* complete inner IPv4 header */
|
||||
eip4->ver_hdrlen = 0x45; /* ver 4, header length 20 B */
|
||||
@ -1263,16 +1233,16 @@ int sub_icmp6_error(struct s_ethernet *eth6,
|
||||
eip4->proto = IPPROTO_ICMP;
|
||||
}
|
||||
|
||||
/* packet_len == sizeof(IPv4) */
|
||||
/* packet_len == sizeof(outer IPv4 header) */
|
||||
*packet_len += sizeof(struct s_icmp) + 4 + sizeof(struct s_ipv4);
|
||||
|
||||
/* copy payload */
|
||||
/* let's use 576 as an IPv4 MTU */
|
||||
if (payload_size > 576 - *packet_len) {
|
||||
memcpy(&packet[*packet_len], payload, 576 - *packet_len);
|
||||
memcpy(packet + *packet_len, payload, 576 - *packet_len);
|
||||
*packet_len = 576;
|
||||
} else {
|
||||
memcpy(&packet[*packet_len], payload, payload_size);
|
||||
memcpy(packet + *packet_len, payload, payload_size);
|
||||
*packet_len += payload_size;
|
||||
}
|
||||
|
||||
|
||||
@ -1,6 +1,6 @@
|
||||
/*
|
||||
* WrapSix
|
||||
* Copyright (C) 2008-2013 Michal Zima <xhire@mujmalysvet.cz>
|
||||
* Copyright (C) 2008-2017 xHire <xhire@wrapsix.org>
|
||||
*
|
||||
* This program is free software: you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
@ -84,9 +84,9 @@ int icmp_ndp(struct s_ethernet *ethq, struct s_ipv6 *ipq,
|
||||
struct s_icmp_ndp_ns *ndp_ns);
|
||||
|
||||
int icmp4_error(struct s_ipv4_addr ip_dest, unsigned char type,
|
||||
unsigned char code, unsigned char *data, unsigned short length);
|
||||
unsigned char code, char *data, unsigned short length);
|
||||
int icmp6_error(struct s_mac_addr mac_dest, struct s_ipv6_addr ip_dest,
|
||||
unsigned char type, unsigned char code, unsigned char *data,
|
||||
unsigned char type, unsigned char code, char *data,
|
||||
unsigned short length);
|
||||
|
||||
#endif /* ICMP_H */
|
||||
|
||||
@ -1,6 +1,6 @@
|
||||
/*
|
||||
* WrapSix
|
||||
* Copyright (C) 2008-2013 Michal Zima <xhire@mujmalysvet.cz>
|
||||
* Copyright (C) 2008-2017 xHire <xhire@wrapsix.org>
|
||||
*
|
||||
* This program is free software: you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
@ -63,7 +63,7 @@ int ipv4(struct s_ethernet *eth, char *packet)
|
||||
payload[0] & 0x08) && !(ip->flags_offset & htons(0x1fff))) {
|
||||
/* code 0 = ttl exceeded in transmit */
|
||||
icmp4_error(ip->ip_src, ICMPV4_TIME_EXCEEDED, 0,
|
||||
(unsigned char *) packet, htons(ip->len));
|
||||
packet, htons(ip->len));
|
||||
}
|
||||
return 1;
|
||||
} else {
|
||||
|
||||
@ -1,6 +1,6 @@
|
||||
/*
|
||||
* WrapSix
|
||||
* Copyright (C) 2008-2013 Michal Zima <xhire@mujmalysvet.cz>
|
||||
* Copyright (C) 2008-2017 xHire <xhire@wrapsix.org>
|
||||
*
|
||||
* This program is free software: you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
@ -56,7 +56,7 @@ int ipv6(struct s_ethernet *eth, char *packet)
|
||||
if (ip->next_header != IPPROTO_ICMPV6 || payload[0] & 0x80) {
|
||||
/* code 0 = hl exceeded in transmit */
|
||||
icmp6_error(eth->src, ip->ip_src, ICMPV6_TIME_EXCEEDED,
|
||||
0, (unsigned char *) packet,
|
||||
0, packet,
|
||||
htons(ip->len) + sizeof(struct s_ipv6));
|
||||
}
|
||||
return 1;
|
||||
|
||||
91
src/tcp.c
91
src/tcp.c
@ -1,6 +1,6 @@
|
||||
/*
|
||||
* WrapSix
|
||||
* Copyright (C) 2008-2013 xHire <xhire@wrapsix.org>
|
||||
* Copyright (C) 2008-2017 xHire <xhire@wrapsix.org>
|
||||
*
|
||||
* This program is free software: you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
@ -51,9 +51,9 @@ int tcp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4, char *payload,
|
||||
struct s_tcp *tcp;
|
||||
struct s_nat *connection;
|
||||
unsigned short tmp_short;
|
||||
unsigned char *packet;
|
||||
char packet[PACKET_BUFFER];
|
||||
|
||||
unsigned char *saved_packet;
|
||||
char *saved_packet;
|
||||
struct s_nat_fragments *frag_conn;
|
||||
linkedlist_node_t *llnode;
|
||||
|
||||
@ -79,7 +79,7 @@ int tcp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4, char *payload,
|
||||
tcp->checksum = 0;
|
||||
tcp->checksum = checksum_ipv4(ip4->ip_src, ip4->ip_dest,
|
||||
payload_size, IPPROTO_TCP,
|
||||
(unsigned char *) tcp);
|
||||
(char *) tcp);
|
||||
|
||||
if (tcp->checksum != tmp_short) {
|
||||
/* packet is corrupted and shouldn't be
|
||||
@ -184,11 +184,10 @@ int tcp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4, char *payload,
|
||||
(char *) llnode->prev->data +
|
||||
sizeof(unsigned short) +
|
||||
sizeof(struct s_ethernet)),
|
||||
(char *) (
|
||||
(char *) llnode->prev->data +
|
||||
sizeof(unsigned short) +
|
||||
sizeof(struct s_ethernet) +
|
||||
sizeof(struct s_ipv4)),
|
||||
sizeof(struct s_ipv4),
|
||||
tmp_short);
|
||||
free(llnode->prev->data);
|
||||
linkedlist_delete(frag_conn->queue,
|
||||
@ -197,15 +196,7 @@ int tcp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4, char *payload,
|
||||
}
|
||||
}
|
||||
|
||||
/* allocate enough memory for translated packet */
|
||||
if ((packet = (unsigned char *) malloc(
|
||||
payload_size > mtu - sizeof(struct s_ipv6) ?
|
||||
mtu + sizeof(struct s_ethernet) :
|
||||
sizeof(struct s_ethernet) + sizeof(struct s_ipv6) +
|
||||
payload_size)) == NULL) {
|
||||
log_error("Lack of free memory");
|
||||
return 1;
|
||||
}
|
||||
/* translated packet */
|
||||
eth6 = (struct s_ethernet *) packet;
|
||||
ip6 = (struct s_ipv6 *) (packet + sizeof(struct s_ethernet));
|
||||
|
||||
@ -244,8 +235,8 @@ int tcp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4, char *payload,
|
||||
ip6->next_header = IPPROTO_FRAGMENT;
|
||||
|
||||
/* create IPv6 fragment header */
|
||||
frag = (struct s_ipv6_fragment *) ((unsigned char *) ip6
|
||||
+ sizeof(struct s_ipv6));
|
||||
frag = (struct s_ipv6_fragment *) ((char *) ip6 +
|
||||
sizeof(struct s_ipv6));
|
||||
frag->next_header = IPPROTO_TCP;
|
||||
frag->zeros = 0x0;
|
||||
frag->offset_flag = htons(IPV6_FLAG_MORE_FRAGMENTS);
|
||||
@ -253,8 +244,7 @@ int tcp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4, char *payload,
|
||||
(unsigned int) rand();
|
||||
|
||||
/* copy the payload data */
|
||||
memcpy((unsigned char *) frag +
|
||||
sizeof(struct s_ipv6_fragment),
|
||||
memcpy((char *) frag + sizeof(struct s_ipv6_fragment),
|
||||
payload, FRAGMENT_LEN);
|
||||
|
||||
/* send translated packet */
|
||||
@ -270,8 +260,7 @@ int tcp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4, char *payload,
|
||||
frag->offset_flag = htons((FRAGMENT_LEN / 8) << 3);
|
||||
|
||||
/* copy the payload data */
|
||||
memcpy((unsigned char *) frag +
|
||||
sizeof(struct s_ipv6_fragment),
|
||||
memcpy((char *) frag + sizeof(struct s_ipv6_fragment),
|
||||
payload + FRAGMENT_LEN,
|
||||
payload_size - FRAGMENT_LEN);
|
||||
|
||||
@ -285,7 +274,7 @@ int tcp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4, char *payload,
|
||||
ip6->next_header = IPPROTO_TCP;
|
||||
|
||||
/* copy the payload data */
|
||||
memcpy((unsigned char *) ip6 + sizeof(struct s_ipv6),
|
||||
memcpy((char *) ip6 + sizeof(struct s_ipv6),
|
||||
payload, payload_size);
|
||||
|
||||
/* send translated packet */
|
||||
@ -303,7 +292,7 @@ int tcp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4, char *payload,
|
||||
log_debug("Incoming connection wasn't found in "
|
||||
"fragments table -- saving it");
|
||||
|
||||
if ((saved_packet = (unsigned char *) malloc(
|
||||
if ((saved_packet = (char *) malloc(
|
||||
sizeof(unsigned short) + sizeof(struct s_ethernet) +
|
||||
sizeof(struct s_ipv4) + payload_size)) == NULL) {
|
||||
log_error("Lack of free memory");
|
||||
@ -322,36 +311,25 @@ int tcp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4, char *payload,
|
||||
/* save the packet and put it into the queue */
|
||||
memcpy(saved_packet, &payload_size,
|
||||
sizeof(unsigned short));
|
||||
memcpy((unsigned char *) (saved_packet +
|
||||
sizeof(unsigned short)), eth4,
|
||||
sizeof(struct s_ethernet));
|
||||
memcpy((unsigned char *) (saved_packet +
|
||||
sizeof(unsigned short) +
|
||||
sizeof(struct s_ethernet)), ip4,
|
||||
sizeof(struct s_ipv4));
|
||||
memcpy((unsigned char *) (saved_packet +
|
||||
sizeof(unsigned short) +
|
||||
memcpy(saved_packet + sizeof(unsigned short),
|
||||
(char *) eth4, sizeof(struct s_ethernet));
|
||||
memcpy(saved_packet + sizeof(unsigned short) +
|
||||
sizeof(struct s_ethernet),
|
||||
(char *) ip4, sizeof(struct s_ipv4));
|
||||
memcpy(saved_packet + sizeof(unsigned short) +
|
||||
sizeof(struct s_ethernet) +
|
||||
sizeof(struct s_ipv4)), payload, payload_size);
|
||||
sizeof(struct s_ipv4), payload, payload_size);
|
||||
|
||||
linkedlist_append(frag_conn->queue, saved_packet);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* allocate enough memory for translated packet */
|
||||
if ((packet = (unsigned char *) malloc(
|
||||
payload_size > mtu - sizeof(struct s_ipv6) -
|
||||
sizeof(struct s_ipv6_fragment) ?
|
||||
mtu + sizeof(struct s_ethernet) :
|
||||
sizeof(struct s_ethernet) + sizeof(struct s_ipv6) +
|
||||
sizeof(struct s_ipv6_fragment) + payload_size)) == NULL) {
|
||||
log_error("Lack of free memory");
|
||||
return 1;
|
||||
}
|
||||
/* translated packet */
|
||||
eth6 = (struct s_ethernet *) packet;
|
||||
ip6 = (struct s_ipv6 *) (packet + sizeof(struct s_ethernet));
|
||||
frag = (struct s_ipv6_fragment *) ((unsigned char *) ip6 +
|
||||
frag = (struct s_ipv6_fragment *) (packet +
|
||||
sizeof(struct s_ethernet) +
|
||||
sizeof(struct s_ipv6));
|
||||
|
||||
/* build ethernet header */
|
||||
@ -386,8 +364,7 @@ int tcp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4, char *payload,
|
||||
IPV6_FLAG_MORE_FRAGMENTS);
|
||||
|
||||
/* copy the payload data */
|
||||
memcpy((unsigned char *) frag +
|
||||
sizeof(struct s_ipv6_fragment),
|
||||
memcpy((char *) frag + sizeof(struct s_ipv6_fragment),
|
||||
payload, FRAGMENT_LEN);
|
||||
|
||||
/* send translated packet */
|
||||
@ -407,8 +384,7 @@ int tcp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4, char *payload,
|
||||
}
|
||||
|
||||
/* copy the payload data */
|
||||
memcpy((unsigned char *) frag +
|
||||
sizeof(struct s_ipv6_fragment),
|
||||
memcpy((char *) frag + sizeof(struct s_ipv6_fragment),
|
||||
payload + FRAGMENT_LEN,
|
||||
payload_size - FRAGMENT_LEN);
|
||||
|
||||
@ -432,7 +408,7 @@ int tcp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4, char *payload,
|
||||
}
|
||||
|
||||
/* copy the payload data */
|
||||
memcpy((unsigned char *) ip6 + sizeof(struct s_ipv6) +
|
||||
memcpy((char *) ip6 + sizeof(struct s_ipv6) +
|
||||
sizeof(struct s_ipv6_fragment),
|
||||
payload, payload_size);
|
||||
|
||||
@ -444,9 +420,6 @@ int tcp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4, char *payload,
|
||||
}
|
||||
}
|
||||
|
||||
/* clean-up */
|
||||
free(packet);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
@ -467,7 +440,7 @@ int tcp_ipv6(struct s_ethernet *eth6, struct s_ipv6 *ip6, char *payload)
|
||||
struct s_nat *connection;
|
||||
unsigned short orig_checksum;
|
||||
struct s_ipv4 *ip4;
|
||||
unsigned char *packet;
|
||||
char packet[PACKET_BUFFER];
|
||||
|
||||
/* parse TCP header */
|
||||
tcp = (struct s_tcp *) payload;
|
||||
@ -477,7 +450,7 @@ int tcp_ipv6(struct s_ethernet *eth6, struct s_ipv6 *ip6, char *payload)
|
||||
tcp->checksum = 0;
|
||||
tcp->checksum = checksum_ipv6(ip6->ip_src, ip6->ip_dest,
|
||||
htons(ip6->len), IPPROTO_TCP,
|
||||
(unsigned char *) payload);
|
||||
(char *) payload);
|
||||
|
||||
if (tcp->checksum != orig_checksum) {
|
||||
/* packet is corrupted and shouldn't be processed */
|
||||
@ -560,12 +533,7 @@ int tcp_ipv6(struct s_ethernet *eth6, struct s_ipv6 *ip6, char *payload)
|
||||
}
|
||||
}
|
||||
|
||||
/* allocate memory for translated packet */
|
||||
if ((packet = (unsigned char *) malloc(sizeof(struct s_ipv4) +
|
||||
htons(ip6->len))) == NULL) {
|
||||
log_error("Lack of free memory");
|
||||
return 1;
|
||||
}
|
||||
/* translated packet */
|
||||
ip4 = (struct s_ipv4 *) packet;
|
||||
|
||||
/* build IPv4 packet */
|
||||
@ -600,8 +568,5 @@ int tcp_ipv6(struct s_ethernet *eth6, struct s_ipv6 *ip6, char *payload)
|
||||
/* send translated packet */
|
||||
transmit_ipv4(&ip4->ip_dest, packet, htons(ip4->len));
|
||||
|
||||
/* clean-up */
|
||||
free(packet);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
@ -1,6 +1,6 @@
|
||||
/*
|
||||
* WrapSix
|
||||
* Copyright (C) 2008-2012 Michal Zima <xhire@mujmalysvet.cz>
|
||||
* Copyright (C) 2008-2017 xHire <xhire@wrapsix.org>
|
||||
*
|
||||
* This program is free software: you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
@ -119,7 +119,7 @@ int transmission_quit(void)
|
||||
* @return 0 for success
|
||||
* @return 1 for failure
|
||||
*/
|
||||
int transmit_raw(unsigned char *data, unsigned int length)
|
||||
int transmit_raw(char *data, unsigned int length)
|
||||
{
|
||||
if (sendto(sock, data, length, 0, (struct sockaddr *) &socket_address,
|
||||
sizeof(struct sockaddr_ll)) != (int) length) {
|
||||
@ -142,8 +142,7 @@ int transmit_raw(unsigned char *data, unsigned int length)
|
||||
* @return 0 for success
|
||||
* @return 1 for failure
|
||||
*/
|
||||
int transmit_ipv4(struct s_ipv4_addr *ip, unsigned char *data,
|
||||
unsigned int length)
|
||||
int transmit_ipv4(struct s_ipv4_addr *ip, char *data, unsigned int length)
|
||||
{
|
||||
/* set the destination IPv4 address */
|
||||
memcpy(&socket_address_ipv4.sin_addr.s_addr, ip,
|
||||
|
||||
@ -1,6 +1,6 @@
|
||||
/*
|
||||
* WrapSix
|
||||
* Copyright (C) 2008-2013 Michal Zima <xhire@mujmalysvet.cz>
|
||||
* Copyright (C) 2008-2017 xHire <xhire@wrapsix.org>
|
||||
*
|
||||
* This program is free software: you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
@ -23,8 +23,7 @@
|
||||
|
||||
int transmission_init(void);
|
||||
int transmission_quit(void);
|
||||
int transmit_raw(unsigned char *data, unsigned int length);
|
||||
int transmit_ipv4(struct s_ipv4_addr *ip, unsigned char *data,
|
||||
unsigned int length);
|
||||
int transmit_raw(char *data, unsigned int length);
|
||||
int transmit_ipv4(struct s_ipv4_addr *ip, char *data, unsigned int length);
|
||||
|
||||
#endif /* TRANSMITTER_H */
|
||||
|
||||
37
src/udp.c
37
src/udp.c
@ -1,6 +1,6 @@
|
||||
/*
|
||||
* WrapSix
|
||||
* Copyright (C) 2008-2013 Michal Zima <xhire@mujmalysvet.cz>
|
||||
* Copyright (C) 2008-2017 xHire <xhire@wrapsix.org>
|
||||
*
|
||||
* This program is free software: you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
@ -18,7 +18,6 @@
|
||||
|
||||
#include <net/ethernet.h> /* ETHERTYPE_* */
|
||||
#include <netinet/in.h> /* htons */
|
||||
#include <stdlib.h> /* malloc */
|
||||
#include <string.h> /* memcpy */
|
||||
|
||||
#include "checksum.h"
|
||||
@ -51,7 +50,7 @@ int udp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4, char *payload,
|
||||
struct s_udp *udp;
|
||||
struct s_nat *connection;
|
||||
unsigned short orig_checksum;
|
||||
unsigned char *packet;
|
||||
char packet[PACKET_BUFFER];
|
||||
|
||||
struct s_ethernet *eth6;
|
||||
struct s_ipv6 *ip6;
|
||||
@ -65,7 +64,7 @@ int udp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4, char *payload,
|
||||
udp->checksum = 0;
|
||||
udp->checksum = checksum_ipv4(ip4->ip_src, ip4->ip_dest,
|
||||
payload_size, IPPROTO_UDP,
|
||||
(unsigned char *) udp);
|
||||
payload);
|
||||
|
||||
if (udp->checksum != orig_checksum) {
|
||||
/* packet is corrupted and shouldn't be processed */
|
||||
@ -85,13 +84,7 @@ int udp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4, char *payload,
|
||||
|
||||
linkedlist_move2end(timeout_udp, connection->llnode);
|
||||
|
||||
/* allocate memory for translated packet */
|
||||
if ((packet = (unsigned char *) malloc(sizeof(struct s_ethernet) +
|
||||
sizeof(struct s_ipv6) +
|
||||
payload_size)) == NULL) {
|
||||
log_error("Lack of free memory");
|
||||
return 1;
|
||||
}
|
||||
/* translated packet */
|
||||
eth6 = (struct s_ethernet *) packet;
|
||||
ip6 = (struct s_ipv6 *) (packet + sizeof(struct s_ethernet));
|
||||
|
||||
@ -124,7 +117,7 @@ int udp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4, char *payload,
|
||||
/* if original checksum was 0x0000, we need to compute it */
|
||||
udp->checksum = checksum_ipv6(ip6->ip_src, ip6->ip_dest,
|
||||
payload_size, IPPROTO_UDP,
|
||||
(unsigned char *) udp);
|
||||
(char *) udp);
|
||||
}
|
||||
|
||||
/* copy the payload data (with new checksum) */
|
||||
@ -135,9 +128,6 @@ int udp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4, char *payload,
|
||||
transmit_raw(packet, sizeof(struct s_ethernet) + sizeof(struct s_ipv6) +
|
||||
payload_size);
|
||||
|
||||
/* clean-up */
|
||||
free(packet);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
@ -158,7 +148,7 @@ int udp_ipv6(struct s_ethernet *eth6, struct s_ipv6 *ip6, char *payload)
|
||||
struct s_nat *connection;
|
||||
unsigned short orig_checksum;
|
||||
struct s_ipv4 *ip4;
|
||||
unsigned char *packet;
|
||||
char packet[PACKET_BUFFER];
|
||||
unsigned int packet_size;
|
||||
|
||||
/* parse UDP header */
|
||||
@ -168,8 +158,7 @@ int udp_ipv6(struct s_ethernet *eth6, struct s_ipv6 *ip6, char *payload)
|
||||
orig_checksum = udp->checksum;
|
||||
udp->checksum = 0;
|
||||
udp->checksum = checksum_ipv6(ip6->ip_src, ip6->ip_dest,
|
||||
htons(ip6->len), IPPROTO_UDP,
|
||||
(unsigned char *) payload);
|
||||
htons(ip6->len), IPPROTO_UDP, payload);
|
||||
|
||||
if (udp->checksum != orig_checksum) {
|
||||
/* packet is corrupted and shouldn't be processed */
|
||||
@ -193,13 +182,10 @@ int udp_ipv6(struct s_ethernet *eth6, struct s_ipv6 *ip6, char *payload)
|
||||
linkedlist_move2end(timeout_udp, connection->llnode);
|
||||
}
|
||||
|
||||
/* allocate memory for translated packet */
|
||||
packet_size = sizeof(struct s_ipv4) + htons(ip6->len);
|
||||
if ((packet = (unsigned char *) malloc(packet_size)) == NULL) {
|
||||
log_error("Lack of free memory");
|
||||
return 1;
|
||||
}
|
||||
|
||||
/* translated packet */
|
||||
ip4 = (struct s_ipv4 *) packet;
|
||||
packet_size = sizeof(struct s_ipv4) + htons(ip6->len);
|
||||
|
||||
/* build IPv4 packet */
|
||||
ip4->ver_hdrlen = 0x45; /* ver 4, header length 20 B */
|
||||
@ -233,8 +219,5 @@ int udp_ipv6(struct s_ethernet *eth6, struct s_ipv6 *ip6, char *payload)
|
||||
/* send translated packet */
|
||||
transmit_ipv4(&ip4->ip_dest, packet, packet_size);
|
||||
|
||||
/* clean-up */
|
||||
free(packet);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user