5 Author: Pekka Riikonen <priikone@silcnet.org>
7 Copyright (C) 1997 - 2005 Pekka Riikonen
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; version 2 of the License.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
20 /****h* silccore/Packet Protocol Interface
24 * The SILC secure binary packet protocol interface, provides interface for
25 * sending and receiving SILC packets. The interface provides a packet
26 * engine, that can be used to receive packets from packet streams, and
27 * routines for sending all kinds of SILC packets.
29 * The packet engine and packet stream are thread safe. They can be safely
30 * used in multi threaded environment.
37 /* XXX many of these could go to silcpacket_i.h */
39 /* Maximum packet length */
40 #define SILC_PACKET_MAX_LEN 0xffff
42 /* Maximum length of ID */
43 #define SILC_PACKET_MAX_ID_LEN 28
45 /****d* silccore/SilcPacketAPI/SilcPacketType
49 * typedef SilcUInt8 SilcPacketType;
53 * SILC packet type definition and all the packet types.
57 typedef SilcUInt8 SilcPacketType;
59 /* SILC Packet types. */
60 #define SILC_PACKET_DISCONNECT 1 /* Disconnection */
61 #define SILC_PACKET_SUCCESS 2 /* Success */
62 #define SILC_PACKET_FAILURE 3 /* Failure */
63 #define SILC_PACKET_REJECT 4 /* Rejected */
64 #define SILC_PACKET_NOTIFY 5 /* Notify message */
65 #define SILC_PACKET_ERROR 6 /* Error message */
66 #define SILC_PACKET_CHANNEL_MESSAGE 7 /* Message for channel */
67 #define SILC_PACKET_CHANNEL_KEY 8 /* Key of the channel */
68 #define SILC_PACKET_PRIVATE_MESSAGE 9 /* Private message */
69 #define SILC_PACKET_PRIVATE_MESSAGE_KEY 10 /* Private message key*/
70 #define SILC_PACKET_COMMAND 11 /* Command */
71 #define SILC_PACKET_COMMAND_REPLY 12 /* Reply to a command */
72 #define SILC_PACKET_KEY_EXCHANGE 13 /* Start of KE */
73 #define SILC_PACKET_KEY_EXCHANGE_1 14 /* KE1 */
74 #define SILC_PACKET_KEY_EXCHANGE_2 15 /* KE2 */
75 #define SILC_PACKET_CONNECTION_AUTH_REQUEST 16 /* Request of auth meth */
76 #define SILC_PACKET_CONNECTION_AUTH 17 /* Connectinon auth */
77 #define SILC_PACKET_NEW_ID 18 /* Sending new ID */
78 #define SILC_PACKET_NEW_CLIENT 19 /* Client registering */
79 #define SILC_PACKET_NEW_SERVER 20 /* Server registering */
80 #define SILC_PACKET_NEW_CHANNEL 21 /* Channel registering */
81 #define SILC_PACKET_REKEY 22 /* Re-key start */
82 #define SILC_PACKET_REKEY_DONE 23 /* Re-key done */
83 #define SILC_PACKET_HEARTBEAT 24 /* Heartbeat */
84 #define SILC_PACKET_KEY_AGREEMENT 25 /* Key Agreement request */
85 #define SILC_PACKET_RESUME_ROUTER 26 /* Backup router resume */
86 #define SILC_PACKET_FTP 27 /* File Transfer */
87 #define SILC_PACKET_RESUME_CLIENT 28 /* Client resume */
89 #define SILC_PACKET_PRIVATE 200 /* Private range start */
90 #define SILC_PACKET_MAX 255 /* RESERVED */
92 #define SILC_PACKET_NONE 0 /* RESERVED */
93 #define SILC_PACKET_ANY 0
96 /****d* silccore/SilcPacketAPI/SilcPacketFlags
100 * typedef SilcUInt8 SilcPacketFlags;
104 * SILC packet flags type definition and all the packet flags.
108 typedef SilcUInt8 SilcPacketFlags;
110 /* All defined packet flags */
111 #define SILC_PACKET_FLAG_NONE 0x00 /* No flags */
112 #define SILC_PACKET_FLAG_PRIVMSG_KEY 0x01 /* Private message key */
113 #define SILC_PACKET_FLAG_LIST 0x02 /* Packet is a list */
114 #define SILC_PACKET_FLAG_BROADCAST 0x04 /* Packet is a broadcast */
115 #define SILC_PACKET_FLAG_COMPRESSED 0x08 /* Payload is compressed */
117 /* Impelemntation specific flags */
118 #define SILC_PACKET_FLAG_LONG_PAD 0x10 /* Use maximum padding */
121 /****s* silccore/SilcPacketAPI/SilcPacketEngine
125 * typedef struct SilcPacketEngineStruct *SilcPacketEngine;
129 * The packet engine context, allocated by silc_packet_engine_start.
130 * The engine is destroyed with silc_packet_engine_stop.
133 typedef struct SilcPacketEngineStruct *SilcPacketEngine;
135 /****s* silccore/SilcPacketAPI/SilcPacketStream
139 * typedef struct SilcPacketStreamStruct *SilcPacketStream;
143 * The packet stream context, allocated by silc_packet_stream_create.
144 * The stream is destroyed with silc_packet_stream_destroy.
147 typedef struct SilcPacketStreamStruct *SilcPacketStream;
149 /****s* silccore/SilcPacketAPI/SilcPacket
153 * typedef struct SilcPacketStruct *SilcPacket;
157 * The SilcPacket is returned by the packet engine in the SilcPacketReceive
158 * callback. The application can parse the data payload from the
159 * SilcPacket. Also packet type, flags, and sender and destination
160 * IDs are available. The application must free the packet with the
161 * silc_packet_free function if it takes it in for processing.
163 * The list pointer `next' can be used by the application to put the
164 * packet context in a list during processing, if needed.
168 typedef struct SilcPacketStruct {
169 struct SilcPacketStruct *next; /* List pointer, application may set */
170 SilcPacketStream stream; /* Packet stream this packet is from */
171 SilcBufferStruct buffer; /* Packet data payload */
172 unsigned char *src_id; /* Source ID */
173 unsigned char *dst_id; /* Destination ID */
174 unsigned int src_id_len : 6; /* Source ID length */
175 unsigned int src_id_type : 2; /* Source ID type */
176 unsigned int dst_id_len : 6; /* Destination ID length */
177 unsigned int dst_id_type : 2; /* Destination ID type */
178 SilcPacketType type; /* Packet type */
179 SilcPacketFlags flags; /* Packet flags */
183 /****d* silcutil/SilcPacketAPI/SilcPacketError
187 * typedef enum { ... } SilcPacketError
191 * Packet errors. This is returned in the error callback. If application
192 * needs the actual lower level stream error, it needs to retrieve it
193 * from the actual stream. It can retrieve the underlaying stream from
194 * the packet stream by calling silc_packet_stream_get_stream function.
199 SILC_PACKET_ERR_READ, /* Error while reading */
200 SILC_PACKET_ERR_WRITE, /* Error while writing */
201 SILC_PACKET_ERR_MAC_FAILED, /* Packet MAC check failed */
202 SILC_PACKET_ERR_DECRYPTION_FAILED, /* Packet decryption failed */
203 SILC_PACKET_ERR_MALFORMED, /* Packet is malformed */
204 SILC_PACKET_ERR_NO_MEMORY, /* System out of memory */
208 /****f* silccore/SilcPacketAPI/SilcPacketReceiveCb
212 * typedef SilcBool (*SilcPacketReceiveCb)(SilcPacketEngine engine,
213 * SilcPacketStream stream,
215 * void *callback_context,
216 * void *stream_context);
220 * The packet receive callback is called by the packet engine when a new
221 * SILC Packet has arrived. The application must free the returned
222 * SilcPacket with silc_packet_free if it takes the packet in for
223 * processing. This callback is set in the SilcPacketCallbacks structure.
224 * The `callback_context' is the context set as argument in the
225 * silc_packet_engine_start function. The `stream_context' is stream
226 * specific context that was set by calling silc_packet_set_context.
228 * If the application takes the received packet `packet' into processing
229 * TRUE must be returned. If FALSE is returned the packet engine will
230 * pass the packet to other packet processor, if one has been linked
231 * to the stream with silc_packet_stream_link function. If no extra
232 * processor is linked the packet is dropped.
237 * silc_foo_packet_receive_cb(SilcPacketEngine engine,
238 * SilcPacketStream stream, SilcPacket packet,
239 * void *callback_context, void *stream_context)
241 * Application ctx = callback_context;
243 * // If we're not up yet, let's not process the packet
244 * if (ctx->initialized == FALSE)
247 * // Process the incoming packet...
250 * // It's our packet now, no one else will get it
255 typedef SilcBool (*SilcPacketReceiveCb)(SilcPacketEngine engine,
256 SilcPacketStream stream,
258 void *callback_context,
259 void *stream_context);
261 /****f* silccore/SilcPacketAPI/SilcPacketEosCb
265 * typedef void (*SilcPacketEosCb)(SilcPacketEngine engine,
266 * SilcPacketStream stream,
267 * void *callback_context,
268 * void *stream_context);
272 * The End Of Stream (EOS) callback, that is called by the packet engine
273 * when the underlaying stream has ended. No more data can be sent to
274 * the stream or read from it. The `stream' must be destroyed by
275 * calling the silc_packet_stream_destroy. This callback is set in the
276 * SilcPacketCallbacks structure.
279 typedef void (*SilcPacketEosCb)(SilcPacketEngine engine,
280 SilcPacketStream stream,
281 void *callback_context,
282 void *stream_context);
284 /****f* silccore/SilcPacketAPI/SilcPacketErrorCb
288 * typedef void (*SilcPacketErrorCb)(SilcPacketEngine engine,
289 * SilcPacketStream stream,
290 * SilcPacketError error,
291 * void *callback_context,
292 * void *stream_context);
296 * The error callback that is called by the packet engine if an error
297 * occurs. The `error' will indicate the error. This callback is set
298 * in the SilcPacketCallbacks structure.
301 typedef void (*SilcPacketErrorCb)(SilcPacketEngine engine,
302 SilcPacketStream stream,
303 SilcPacketError error,
304 void *callback_context,
305 void *stream_context);
307 /****s* silccore/SilcPacketAPI/SilcPacketStream
311 * typedef struct SilcPacketStreamStruct *SilcPacketStream;
315 * This structure is sent as argument to the silc_packet_engine_start
316 * function to set the callback functions for the packet engine. The
317 * packet engine will call the callbacks when necessary. Application
318 * must always be provided for the packet engine.
323 SilcPacketReceiveCb packet_receive; /* Called when packet is received */
324 SilcPacketEosCb eos; /* Called on end of stream */
325 SilcPacketErrorCb error; /* Called on an error */
326 } SilcPacketCallbacks;
331 /****f* silccore/SilcPacketAPI/silc_packet_engine_start
336 * silc_packet_engine_start(SilcRng rng, SilcBool router,
337 * SilcPacketCallbacks *callbacks,
338 * void *callback_context);
342 * Create new packet engine for processing incoming and outgoing packets.
343 * If `router' is TRUE then the application is considered to be router
344 * server, and certain packets are handled differently. Client and normal
345 * server must set it to FALSE. The `callbacks' is a SilcPacketCallbacks
346 * structure provided by the caller which includes the callbacks that is
347 * called when for example packet is received, or end of stream is called.
351 * The packet engine is thread safe. You can use one packet engine in
352 * multi threaded application.
356 silc_packet_engine_start(SilcRng rng, SilcBool router,
357 SilcPacketCallbacks *callbacks,
358 void *callback_context);
360 /****f* silccore/SilcPacketAPI/silc_packet_engine_stop
364 * void silc_packet_engine_stop(SilcPacketEngine engine);
368 * Stop the packet engine. No new packets can be sent or received after
369 * calling this, and the `engine' will become invalid.
372 void silc_packet_engine_stop(SilcPacketEngine engine);
374 /****f* silccore/SilcPacketAPI/silc_packet_stream_create
378 * SilcPacketStream silc_packet_stream_create(SilcPacketEngine engine,
379 * SilcSchedule schedule,
380 * SilcStream stream);
384 * Create new packet stream and use the `stream' as underlaying stream.
385 * Usually the `stream' would be a socket stream, but it can be any
386 * stream. After this function returns, packets can immediately be
387 * sent to or received from the stream.
391 * SilcPacketStream cannot be used with silc_stream_* routines (such as
392 * silc_stream_read and silc_stream_write) because of its special nature.
393 * Use the silc_packet_send and the silc_packet_send_ext to send packets.
394 * To read packets you will receive the packet receive callback from
395 * packet engine. Destroy the stream with silc_packet_stream_destroy.
397 * If you need to send only one type of SILC packets, then it is possible
398 * to create SILC Packet Streamer with silc_packet_streamer_create, which
399 * can be used with silc_stream_read and silc_stream_write.
401 * The SilcPacketStream is thread safe. Same context can be safely used
402 * in multi threaded environment.
405 SilcPacketStream silc_packet_stream_create(SilcPacketEngine engine,
406 SilcSchedule schedule,
409 /****f* silccore/SilcPacketAPI/silc_packet_stream_destroy
413 * void silc_packet_stream_destroy(SilcPacketStream stream);
417 * Destroy packet stream and the underlaying stream. This will also
418 * send end of stream to the underlaying stream.
421 void silc_packet_stream_destroy(SilcPacketStream stream);
423 /****f* silccore/SilcPacketAPI/silc_packet_stream_set_router
427 * void silc_packet_stream_set_router(SilcPacketStream stream);
431 * When called sets the stream indicates by `stream' as SILC router
432 * connection stream. This causes that certain packets are handled
433 * differently. This must be called for router connection streams and
434 * must not be called for any other stream.
437 void silc_packet_stream_set_router(SilcPacketStream stream);
439 /****f* silccore/SilcPacketAPI/silc_packet_streamer_create
443 * SilcStream silc_packet_streamer_create(SilcPacketStream stream,
444 * SilcPacketType packet_type,
445 * SilcPacketFlags packet_flags);
449 * This function can be used to create a SILC Packet Streamer that will
450 * stream only one type of packet indicated by `packet_type' with packet
451 * flags `packet_flags'. This is special purpose function as usually
452 * multiple different types of packets need to be sent in application.
453 * There are cases however when creating streamer is simpler and more
454 * efficient. Cases such as file transfer stream or other data streams
455 * that only send and receive one type of packet. While it would be
456 * possible to use silc_packet_send function to send packets it is
457 * more efficient to create the SILC Packet Streamer and use the
458 * silc_stream_read and silc_stream_write functions.
460 * The encryption and decryption keys, and other information will be
461 * retrieved from the packet stream indicated by `stream', which must be
462 * created before creating the streamer.
466 * The packet type that is assocated with the packet stream `stream' will
467 * only be available through the returned SilcStream. That packet type
468 * will not be delivered to the packet callbacks. To return to the
469 * normal operation destroy the streamer silc_packet_streamer_destroy.
472 SilcStream silc_packet_streamer_create(SilcPacketStream stream,
473 SilcPacketType packet_type,
474 SilcPacketFlags packet_flags);
476 /****f* silccore/SilcPacketAPI/silc_packet_streamer_destroy
480 * void silc_packet_streamer_destroy(SilcStream stream);
484 * Destroys the created packet streamer. Use this function only for
485 * stream created with silc_packet_streamer_create. The packet type
486 * that was associated with the streamer can be received in the packet
487 * callbacks after the streamer is destroyed.
490 void silc_packet_streamer_destroy(SilcStream stream);
492 /****f* silccore/SilcPacketAPI/silc_packet_stream_get_stream
496 * SilcStream silc_packet_stream_get_stream(SilcPacketStream stream);
500 * Returns the actual stream that is associated with the packet stream
501 * `stream'. The caller must not free the returned stream. The returned
502 * stream is the same pointer that was set for silc_packet_stream_create.
503 * This function could be used for example when an error callback is
504 * called by the packet engine to retrieve the actual lower level error
508 SilcStream silc_packet_stream_get_stream(SilcPacketStream stream);
510 /****f* silccore/SilcPacketAPI/silc_packet_stream_link
514 * SilcBool silc_packet_stream_link(SilcPacketStream stream,
515 * SilcPacketCallbacks *callbacks,
516 * void *callback_context,
517 * int priority, ...);
521 * Links the packet processing callbacks indicated by `callbacks' into
522 * the packet stream indicated by `stream' with priority `priority' for
523 * the packet types given in the variable argument list. This function
524 * can be used to link to the packet stream for specific packet types
525 * and receive them in the specified callbacks. This way, a third party,
526 * for example some library may attach itself into the packet stream
527 * and receive and process certain packets. The variable argument
528 * list is ended with -1. To link to receive all packets use
531 * The default packet processing callbacks given as argument to the
532 * silc_packet_engine_start has the priority 0. Any priority higher
533 * than 0 will then take precedence over the default callbacks. Any
534 * priority lower than 0 (negative value) will be processed after the
537 * Note that setting only the 'packet_receive' callback in the `callbacks'
542 * // Link to this packet stream, with high priority, for
543 * // SILC_PACKET_CONNECTION_AUTH and SILC_PACKET_CONNECTION_AUTH_REQUEST
544 * // packets. We don't care about other packets.
545 * silc_packet_stream_link(stream, our_callbacks, our_context,
546 * 1000000, SILC_PACKET_CONNECTION_AUTH,
547 * SILC_PACKET_CONNECTION_AUTH_REQUEST, -1);
550 SilcBool silc_packet_stream_link(SilcPacketStream stream,
551 SilcPacketCallbacks *callbacks,
552 void *callback_context,
555 /****f* silccore/SilcPacketAPI/silc_packet_stream_unlink
559 * void silc_packet_stream_unlink(SilcPacketStream stream,
560 * SilcPacketCallbacks *callbacks,
561 * void *callback_context);
565 * Unlinks the `callbacks' with `callback_context' from the packet stream
566 * indicated by `stream'. This function must be called for the callbacks
567 * that was linked to `stream' when they are not needed anymore.
570 void silc_packet_stream_unlink(SilcPacketStream stream,
571 SilcPacketCallbacks *callbacks,
572 void *callback_context);
574 /****f* silccore/SilcPacketAPI/silc_packet_stream_ref
578 * void silc_packet_stream_ref(SilcPacketStream stream);
582 * Increase reference counter for the stream indicated by `stream'. This
583 * can be used to take a reference for the stream. To unreference the
584 * stream call silc_packet_stream_unref function.
587 void silc_packet_stream_ref(SilcPacketStream stream);
589 /****f* silccore/SilcPacketAPI/silc_packet_stream_unref
593 * void silc_packet_stream_unref(SilcPacketStream stream);
597 * Decrease reference counter for the stream indicated by `stream'. If
598 * the counter hits zero the stream will be destroyed automatically.
601 void silc_packet_stream_unref(SilcPacketStream stream);
603 /****f* silccore/SilcPacketAPI/silc_packet_get_engine
607 * SilcPacketEngine silc_packet_get_engine(SilcPacketStream stream);
611 * Returns the packet engine from the `stream'.
614 SilcPacketEngine silc_packet_get_engine(SilcPacketStream stream);
616 /****f* silccore/SilcPacketAPI/silc_packet_set_context
620 * void silc_packet_set_context(SilcPacketStream stream,
621 * void *stream_context);
625 * Sets a stream specific context to the stream. The context will
626 * be delivered to all callback functions, and it can be retrieved by
627 * calling silc_packet_get_context function as well. Note that this is
628 * separate packet stream specific context, and not the same as
629 * `callback_context' in silc_packet_engine_start. Both will be delivered
630 * to the callbacks, and this context as the `stream_context' argument.
633 void silc_packet_set_context(SilcPacketStream stream, void *stream_context);
635 /****f* silccore/SilcPacketAPI/silc_packet_get_context
639 * void *silc_packet_get_context(SilcPacketStream stream);
643 * Returns the current set application context, or NULL if none is set.
646 void *silc_packet_get_context(SilcPacketStream stream);
648 /****f* silccore/SilcPacketAPI/silc_packet_set_ciphers
652 * void silc_packet_set_ciphers(SilcPacketStream stream, SilcCipher send,
653 * SilcCipher receive);
657 * Set ciphers to be used to encrypt sent packets, and decrypt received
658 * packets. This can be called multiple times to change the ciphers.
659 * In this case if old cipher is set it will be freed. If ciphers are
660 * not set packets will not be encrypted or decrypted.
663 void silc_packet_set_ciphers(SilcPacketStream stream, SilcCipher send,
666 /****f* silccore/SilcPacketAPI/silc_packet_get_ciphers
670 * SilcBool silc_packet_get_ciphers(SilcPacketStream stream,
672 * SilcCipher *receive);
676 * Returns the pointers of current ciphers from the `stream'. Returns
677 * FALSE if ciphers are not set.
680 SilcBool silc_packet_get_ciphers(SilcPacketStream stream, SilcCipher *send,
681 SilcCipher *receive);
683 /****f* silccore/SilcPacketAPI/silc_packet_set_hmacs
687 * void silc_packet_set_hmacs(SilcPacketStream stream, SilcHmac send,
692 * Set HMACs to be used to create MACs for sent packets and to check
693 * MAC for received packets. This can be called multiple times to change
694 * the HMACs. In this case if old HMAC is set it will be freed. If
695 * HMACs are not set MACs are not generated or verified for packets.
698 void silc_packet_set_hmacs(SilcPacketStream stream, SilcHmac send,
701 /****f* silccore/SilcPacketAPI/silc_packet_get_hmacs
705 * SilcBool silc_packet_get_hmacs(SilcPacketStream stream, SilcHmac *send,
706 * SilcHmac *receive);
710 * Returns the pointers of current HMACs from the `stream'. Returns
711 * FALSE if HMACs are not set.
714 SilcBool silc_packet_get_hmacs(SilcPacketStream stream, SilcHmac *send,
717 /****f* silccore/SilcPacketAPI/silc_packet_set_ids
721 * SilcBool silc_packet_set_ids(SilcPacketStream stream,
722 * SilcIdType src_id_type, const void *src_id
723 * SilcIdType dst_id_type, const void *dst_id);
727 * Set the source ID and destinaion ID to be used when sending packets to
728 * this packet stream. The IDs to be used for a packet stream can be
729 * overridden when sending packets. However, if the IDs do not ever change
730 * for the packet stream it is recommended they are set using this function.
731 * In this case they can be omitted when sending packets to the stream.
732 * It is also possible to set only source or destination ID.
735 SilcBool silc_packet_set_ids(SilcPacketStream stream,
736 SilcIdType src_id_type, const void *src_id,
737 SilcIdType dst_id_type, const void *dst_id);
739 /****f* silccore/SilcPacketAPI/silc_packet_send
743 * SilcBool silc_packet_send(SilcPacketStream stream,
744 * SilcPacketType type, SilcPacketFlags flags,
745 * const unsigned char *data,
746 * SilcUInt32 data_len);
750 * Send `data' of length of `data_len' to the packet stream indicated by
751 * `stream'. If ciphers and HMACs were set using silc_packet_set_ciphers
752 * and silc_packet_set_hmacs the packet will be encrypted and MAC will be
753 * computed for it. If silc_packet_set_ids was used to set source and
754 * destination ID for the packet stream those IDs are used in the
755 * packet. If IDs have not been set and they need to be provided then
756 * silc_packet_send_ext function should be used. Otherwise, the packet
757 * will not have IDs set at all. Returns FALSE if packet could not be
761 SilcBool silc_packet_send(SilcPacketStream stream,
762 SilcPacketType type, SilcPacketFlags flags,
763 const unsigned char *data, SilcUInt32 data_len);
765 /****f* silccore/SilcPacketAPI/silc_packet_send_ext
770 * silc_packet_send_ext(SilcPacketStream stream,
771 * SilcPacketType type, SilcPacketFlags flags,
772 * SilcIdType src_id_type, void *srd_id,
773 * SilcIdType dst_id_type, void *dst_id,
774 * const unsigned char *data, SilcUInt32 data_len,
775 * SilcCipher cipher, SilcHmac hmac);
779 * Same as silc_packet_send but with this function different sending
780 * parameters can be sent as argument. This function can be used to
781 * set specific IDs, cipher and HMAC to be used in packet sending,
782 * instead of the ones saved in the `stream'.
785 SilcBool silc_packet_send_ext(SilcPacketStream stream,
786 SilcPacketType type, SilcPacketFlags flags,
787 SilcIdType src_id_type, void *src_id,
788 SilcIdType dst_id_type, void *dst_id,
789 const unsigned char *data, SilcUInt32 data_len,
790 SilcCipher cipher, SilcHmac hmac);
792 /****f* silccore/SilcPacketAPI/silc_packet_free
796 * void silc_packet_free(SilcPacket packet);
800 * This function is used to free the SilcPacket pointer that application
801 * receives in the SilcPacketReceive callback. Application must free
802 * the packet if it takes it in to processing.
805 void silc_packet_free(SilcPacket packet);
807 #endif /* SILCPACKET_H */