4 * uAnytun is a tiny implementation of SATP. Unlike Anytun which is a full
5 * featured implementation uAnytun has no support for multiple connections
6 * or synchronisation. It is a small single threaded implementation intended
7 * to act as a client on small platforms.
8 * The secure anycast tunneling protocol (satp) defines a protocol used
9 * for communication between any combination of unicast and anycast
10 * tunnel endpoints. It has less protocol overhead than IPSec in Tunnel
11 * mode and allows tunneling of every ETHER TYPE protocol (e.g.
12 * ethernet, ip, arp ...). satp directly includes cryptography and
13 * message authentication based on the methodes used by SRTP. It is
14 * intended to deliver a generic, scaleable and secure solution for
15 * tunneling and relaying of packets of any protocol.
18 * Copyright (C) 2007-2010 Christian Pointner <equinox@anytun.org>
20 * This file is part of uAnytun.
22 * uAnytun is free software: you can redistribute it and/or modify
23 * it under the terms of the GNU General Public License as published by
24 * the Free Software Foundation, either version 3 of the License, or
27 * uAnytun is distributed in the hope that it will be useful,
28 * but WITHOUT ANY WARRANTY; without even the implied warranty of
29 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
30 * GNU General Public License for more details.
32 * You should have received a copy of the GNU General Public License
33 * along with uAnytun. If not, see <http://www.gnu.org/licenses/>.
36 #include "datatypes.h"
38 #include "plain_packet.h"
42 #include <sys/types.h>
43 #include <netinet/in.h>
44 #include <netinet/in_systm.h>
45 #include <netinet/ip.h>
47 void plain_packet_init(plain_packet_t* packet)
52 memset (packet, 0, sizeof(*packet));
55 u_int32_t plain_packet_get_header_length()
57 return sizeof(payload_type_t);
60 u_int8_t* plain_packet_get_packet(plain_packet_t* packet)
65 return packet->data_.buf_;
68 u_int32_t plain_packet_get_length(plain_packet_t* packet)
73 return (packet->payload_length_ + sizeof(payload_type_t));
76 void plain_packet_set_length(plain_packet_t* packet, u_int32_t len)
81 if(len > PLAIN_PACKET_SIZE_MAX)
82 len = PLAIN_PACKET_SIZE_MAX - sizeof(payload_type_t);
83 else if(len < sizeof(payload_type_t))
86 len -= sizeof(payload_type_t);
88 packet->payload_length_ = len;
91 u_int8_t* plain_packet_get_payload(plain_packet_t* packet)
93 if(!packet || !packet->payload_length_)
96 return (packet->data_.buf_ + sizeof(payload_type_t));
99 u_int32_t plain_packet_get_payload_length(plain_packet_t* packet)
104 return packet->payload_length_;
107 void plain_packet_set_payload_length(plain_packet_t* packet, u_int32_t len)
112 if(len > PLAIN_PACKET_SIZE_MAX || (len + sizeof(payload_type_t)) > PLAIN_PACKET_SIZE_MAX)
113 len = PLAIN_PACKET_SIZE_MAX - sizeof(payload_type_t);
115 packet->payload_length_ = len;
118 payload_type_t plain_packet_get_type(plain_packet_t* packet)
123 return PAYLOAD_TYPE_T_NTOH(packet->data_.payload_type_);
126 void plain_packet_set_type(plain_packet_t* packet, payload_type_t type)
131 if(type == PAYLOAD_TYPE_TUN) {
132 if(!packet->payload_length_) {
133 packet->data_.payload_type_ = PAYLOAD_TYPE_T_HTON(PAYLOAD_TYPE_TUN);
137 struct ip* hdr = (struct ip*)(packet->data_.buf_ + sizeof(payload_type_t));
139 packet->data_.payload_type_ = PAYLOAD_TYPE_T_HTON(PAYLOAD_TYPE_TUN4);
140 else if(hdr->ip_v == 6)
141 packet->data_.payload_type_ = PAYLOAD_TYPE_T_HTON(PAYLOAD_TYPE_TUN6);
144 packet->data_.payload_type_ = PAYLOAD_TYPE_T_HTON(type);