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/*
* Copyright 2011 Daniel Drown
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* translate.h - translate from one version of ip to another
*/
#ifndef __TRANSLATE_H__
#define __TRANSLATE_H__
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip_icmp.h>
#include <netinet/udp.h>
#include <netinet/tcp.h>
#include <netinet/ip6.h>
#include <netinet/icmp6.h>
#include <linux/icmp.h>
#include <linux/if_tun.h>
#include "clatd.h"
#define MAX_TCP_HDR (15 * 4) // Data offset field is 4 bits and counts in 32-bit words.
// Calculates the checksum over all the packet components starting from pos.
uint16_t packet_checksum(uint32_t checksum, clat_packet packet, clat_packet_index pos);
// Returns the total length of the packet components after pos.
uint16_t packet_length(clat_packet packet, clat_packet_index pos);
// Returns true iff the given IPv6 address is in the plat subnet.
int is_in_plat_subnet(const struct in6_addr *addr6);
// Functions to create tun, IPv4, and IPv6 headers.
void fill_tun_header(struct tun_pi *tun_header, uint16_t proto);
void fill_ip_header(struct iphdr *ip_targ, uint16_t payload_len, uint8_t protocol,
const struct ip6_hdr *old_header);
void fill_ip6_header(struct ip6_hdr *ip6, uint16_t payload_len, uint8_t protocol,
const struct iphdr *old_header);
// Translate and send packets.
void translate_packet(int fd, int to_ipv6, const uint8_t *packet, size_t packetsize);
// Translate IPv4 and IPv6 packets.
int ipv4_packet(clat_packet out, clat_packet_index pos, const uint8_t *packet, size_t len);
int ipv6_packet(clat_packet out, clat_packet_index pos, const uint8_t *packet, size_t len);
// Deal with fragmented packets.
size_t maybe_fill_frag_header(struct ip6_frag *frag_hdr, struct ip6_hdr *ip6_targ,
const struct iphdr *old_header);
uint8_t parse_frag_header(const struct ip6_frag *frag_hdr, struct iphdr *ip_targ);
// Deal with fragmented packets.
size_t maybe_fill_frag_header(struct ip6_frag *frag_hdr, struct ip6_hdr *ip6_targ,
const struct iphdr *old_header);
uint8_t parse_frag_header(const struct ip6_frag *frag_hdr, struct iphdr *ip_targ);
// Translate ICMP packets.
int icmp_to_icmp6(clat_packet out, clat_packet_index pos, const struct icmphdr *icmp,
uint32_t checksum, const uint8_t *payload, size_t payload_size);
int icmp6_to_icmp(clat_packet out, clat_packet_index pos, const struct icmp6_hdr *icmp6,
const uint8_t *payload, size_t payload_size);
// Translate generic IP packets.
int generic_packet(clat_packet out, clat_packet_index pos, const uint8_t *payload, size_t len);
// Translate TCP and UDP packets.
int tcp_packet(clat_packet out, clat_packet_index pos, const struct tcphdr *tcp,
uint32_t old_sum, uint32_t new_sum, size_t len);
int udp_packet(clat_packet out, clat_packet_index pos, const struct udphdr *udp,
uint32_t old_sum, uint32_t new_sum, size_t len);
int tcp_translate(clat_packet out, clat_packet_index pos, const struct tcphdr *tcp,
size_t header_size, uint32_t old_sum, uint32_t new_sum,
const uint8_t *payload, size_t payload_size);
int udp_translate(clat_packet out, clat_packet_index pos, const struct udphdr *udp,
uint32_t old_sum, uint32_t new_sum,
const uint8_t *payload, size_t payload_size);
#endif /* __TRANSLATE_H__ */
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