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