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/*
* uAnytun
*
* uAnytun is a tiny implementation of SATP. Unlike Anytun which is a full
* featured implementation uAnytun has no support for multiple connections
* or synchronisation. It is a small single threaded implementation intended
* to act as a client on small platforms.
* The secure anycast tunneling protocol (satp) defines a protocol used
* for communication between any combination of unicast and anycast
* tunnel endpoints. It has less protocol overhead than IPSec in Tunnel
* mode and allows tunneling of every ETHER TYPE protocol (e.g.
* ethernet, ip, arp ...). satp directly includes cryptography and
* message authentication based on the methods used by SRTP. It is
* intended to deliver a generic, scaleable and secure solution for
* tunneling and relaying of packets of any protocol.
*
*
* Copyright (C) 2007-2014 Christian Pointner <equinox@anytun.org>
*
* This file is part of uAnytun.
*
* uAnytun is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* uAnytun is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with uAnytun. If not, see <http://www.gnu.org/licenses/>.
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of portions of this program with the
* OpenSSL library under certain conditions as described in each
* individual source file, and distribute linked combinations
* including the two.
* You must obey the GNU General Public License in all respects
* for all of the code used other than OpenSSL. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you
* do not wish to do so, delete this exception statement from your
* version. If you delete this exception statement from all source
* files in the program, then also delete it here.
*/
#ifndef UANYTUN_packet_queue_h_INCLUDED
#define UANYTUN_packet_queue_h_INCLUDED
#define PACKET_QUEUE_FLAGS_USED 0x00000001
struct packet_queue_struct {
size_t size_;
void* packets_;
int* flags_;
};
typedef struct packet_queue_struct packet_queue_t;
#define packet_queue_init(TYPE, ...) do { \
int i; \
for(i = 0; i < TYPE ## _queue.size_; ++i) { \
TYPE ## _queue.flags_[i] = 0; \
TYPE ## _init(&(((TYPE ## _t*)TYPE ## _queue.packets_)[i]), ## __VA_ARGS__); \
} \
} while(0)
#define packet_queue_acquire_next(TYPE, idx) do { \
idx = -1; \
int i; \
for(i = 0; i < TYPE ## _queue.size_; ++i) { \
if(!(TYPE ## _queue.flags_[i] & PACKET_QUEUE_FLAGS_USED)) { \
TYPE ## _queue.flags_[i] |= PACKET_QUEUE_FLAGS_USED; \
idx = i; \
break; \
} \
} \
} while(0)
#define packet_queue_release(TYPE, packet) do { \
int i; \
for(i = 0; i < TYPE ## _queue.size_; ++i) { \
if(&(((TYPE ## _t*)TYPE ## _queue.packets_)[i]) == packet) { \
TYPE ## _queue.flags_[i] &= ~PACKET_QUEUE_FLAGS_USED; \
break; \
} \
} \
} while(0)
#define packet_queue_get(TYPE, idx) (idx >= 0) && (idx < TYPE ## _queue.size_) ? &(((TYPE ## _t*)TYPE ## _queue.packets_)[idx]) : NULL
#define packet_queue_instantiate(SIZE, TYPE) \
TYPE ## _t TYPE ## _data_array[SIZE]; \
int TYPE ## _flags_array[SIZE]; \
packet_queue_t TYPE ## _queue = { SIZE, TYPE ## _data_array, TYPE ## _flags_array }; \
TYPE ## _t* TYPE ## _queue_get_next() { \
int idx; \
packet_queue_acquire_next(TYPE, idx); \
return packet_queue_get(TYPE, idx); \
} \
void TYPE ## _queue_release(TYPE ## _t* packet) { \
packet_queue_release(TYPE, packet); \
} \
#endif
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