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Diffstat (limited to 'src/packet_queue.h')
-rw-r--r-- | src/packet_queue.h | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/src/packet_queue.h b/src/packet_queue.h new file mode 100644 index 0000000..df27a85 --- /dev/null +++ b/src/packet_queue.h @@ -0,0 +1,109 @@ +/* + * 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 + |