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) 2007-2008 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 version 3 as
24 * published by the Free Software Foundation.
26 * uAnytun is distributed in the hope that it will be useful,
27 * but WITHOUT ANY WARRANTY; without even the implied warranty of
28 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
29 * GNU General Public License for more details.
31 * You should have received a copy of the GNU General Public License
32 * along with uAnytun. If not, see <http://www.gnu.org/licenses/>.
35 #include "datatypes.h"
37 #include "plain_packet.h"
41 #include <sys/types.h>
42 #include <netinet/in.h>
43 #include <netinet/in_systm.h>
44 #include <netinet/ip.h>
46 void plain_packet_init(plain_packet_t* packet)
51 memset (packet, 0, sizeof(*packet));
54 u_int32_t plain_packet_get_header_length()
56 return sizeof(payload_type_t);
59 u_int8_t* plain_packet_get_packet(plain_packet_t* packet)
64 return packet->data_.buf_;
67 u_int32_t plain_packet_get_length(plain_packet_t* packet)
72 return (packet->payload_length_ + sizeof(payload_type_t));
75 void plain_packet_set_length(plain_packet_t* packet, u_int32_t len)
80 if(len > PLAIN_PACKET_SIZE_MAX)
81 len = PLAIN_PACKET_SIZE_MAX - sizeof(payload_type_t);
82 else if(len < sizeof(payload_type_t))
85 len -= sizeof(payload_type_t);
87 packet->payload_length_ = len;
90 u_int8_t* plain_packet_get_payload(plain_packet_t* packet)
92 if(!packet || !packet->payload_length_)
95 return (packet->data_.buf_ + sizeof(payload_type_t));
98 u_int32_t plain_packet_get_payload_length(plain_packet_t* packet)
103 return packet->payload_length_;
106 void plain_packet_set_payload_length(plain_packet_t* packet, u_int32_t len)
111 if(len > PLAIN_PACKET_SIZE_MAX || (len + sizeof(payload_type_t)) > PLAIN_PACKET_SIZE_MAX)
112 len = PLAIN_PACKET_SIZE_MAX - sizeof(payload_type_t);
114 packet->payload_length_ = len;
117 payload_type_t plain_packet_get_type(plain_packet_t* packet)
122 return PAYLOAD_TYPE_T_NTOH(packet->data_.payload_type_);
125 void plain_packet_set_type(plain_packet_t* packet, payload_type_t type)
130 if(type == PAYLOAD_TYPE_TUN) {
131 if(!packet->payload_length_) {
132 packet->data_.payload_type_ = PAYLOAD_TYPE_T_HTON(PAYLOAD_TYPE_TUN);
136 struct ip* hdr = (struct ip*)(packet->data_.buf_ + sizeof(payload_type_t));
138 packet->data_.payload_type_ = PAYLOAD_TYPE_T_HTON(PAYLOAD_TYPE_TUN4);
139 else if(hdr->ip_v == 6)
140 packet->data_.payload_type_ = PAYLOAD_TYPE_T_HTON(PAYLOAD_TYPE_TUN6);
143 packet->data_.payload_type_ = PAYLOAD_TYPE_T_HTON(type);