397 lines
14 KiB
C
397 lines
14 KiB
C
|
//=====================================================================
|
||
|
|
//
|
||
|
|
// KCP - A Better ARQ Protocol Implementation
|
||
|
|
// skywind3000 (at) gmail.com, 2010-2011
|
||
|
|
//
|
||
|
|
// Features:
|
||
|
|
// + Average RTT reduce 30% - 40% vs traditional ARQ like tcp.
|
||
|
|
// + Maximum RTT reduce three times vs tcp.
|
||
|
|
// + Lightweight, distributed as a single source file.
|
||
|
|
//
|
||
|
|
//=====================================================================
|
||
|
|
#ifndef __IKCP_H__
|
||
|
|
#define __IKCP_H__
|
||
|
|
|
||
|
|
#include <assert.h>
|
||
|
|
#include <stddef.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
|
||
|
|
//=====================================================================
|
||
|
|
// 32BIT INTEGER DEFINITION
|
||
|
|
//=====================================================================
|
||
|
|
#ifndef __INTEGER_32_BITS__
|
||
|
|
#define __INTEGER_32_BITS__
|
||
|
|
#if defined(_WIN64) || defined(WIN64) || defined(__amd64__) || defined(__x86_64) || defined(__x86_64__) \
|
||
|
|
|| defined(_M_IA64) || defined(_M_AMD64)
|
||
|
|
typedef unsigned int ISTDUINT32;
|
||
|
|
typedef int ISTDINT32;
|
||
|
|
#elif defined(_WIN32) || defined(WIN32) || defined(__i386__) || defined(__i386) || defined(_M_X86)
|
||
|
|
typedef unsigned long ISTDUINT32;
|
||
|
|
typedef long ISTDINT32;
|
||
|
|
#elif defined(__MACOS__)
|
||
|
|
typedef UInt32 ISTDUINT32;
|
||
|
|
typedef SInt32 ISTDINT32;
|
||
|
|
#elif defined(__APPLE__) && defined(__MACH__)
|
||
|
|
#include <sys/types.h>
|
||
|
|
typedef u_int32_t ISTDUINT32;
|
||
|
|
typedef int32_t ISTDINT32;
|
||
|
|
#elif defined(__BEOS__)
|
||
|
|
#include <sys/inttypes.h>
|
||
|
|
typedef u_int32_t ISTDUINT32;
|
||
|
|
typedef int32_t ISTDINT32;
|
||
|
|
#elif (defined(_MSC_VER) || defined(__BORLANDC__)) && (!defined(__MSDOS__))
|
||
|
|
typedef unsigned __int32 ISTDUINT32;
|
||
|
|
typedef __int32 ISTDINT32;
|
||
|
|
#elif defined(__GNUC__)
|
||
|
|
#include <stdint.h>
|
||
|
|
typedef uint32_t ISTDUINT32;
|
||
|
|
typedef int32_t ISTDINT32;
|
||
|
|
#else
|
||
|
|
typedef unsigned long ISTDUINT32;
|
||
|
|
typedef long ISTDINT32;
|
||
|
|
#endif
|
||
|
|
#endif
|
||
|
|
|
||
|
|
//=====================================================================
|
||
|
|
// Integer Definition
|
||
|
|
//=====================================================================
|
||
|
|
#ifndef __IINT8_DEFINED
|
||
|
|
#define __IINT8_DEFINED
|
||
|
|
typedef char IINT8;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifndef __IUINT8_DEFINED
|
||
|
|
#define __IUINT8_DEFINED
|
||
|
|
typedef unsigned char IUINT8;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifndef __IUINT16_DEFINED
|
||
|
|
#define __IUINT16_DEFINED
|
||
|
|
typedef unsigned short IUINT16;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifndef __IINT16_DEFINED
|
||
|
|
#define __IINT16_DEFINED
|
||
|
|
typedef short IINT16;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifndef __IINT32_DEFINED
|
||
|
|
#define __IINT32_DEFINED
|
||
|
|
typedef ISTDINT32 IINT32;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifndef __IUINT32_DEFINED
|
||
|
|
#define __IUINT32_DEFINED
|
||
|
|
typedef ISTDUINT32 IUINT32;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifndef __IINT64_DEFINED
|
||
|
|
#define __IINT64_DEFINED
|
||
|
|
#if defined(_MSC_VER) || defined(__BORLANDC__)
|
||
|
|
typedef __int64 IINT64;
|
||
|
|
#else
|
||
|
|
typedef long long IINT64;
|
||
|
|
#endif
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifndef __IUINT64_DEFINED
|
||
|
|
#define __IUINT64_DEFINED
|
||
|
|
#if defined(_MSC_VER) || defined(__BORLANDC__)
|
||
|
|
typedef unsigned __int64 IUINT64;
|
||
|
|
#else
|
||
|
|
typedef unsigned long long IUINT64;
|
||
|
|
#endif
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifndef INLINE
|
||
|
|
#if defined(__GNUC__)
|
||
|
|
|
||
|
|
#if (__GNUC__ > 3) || ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 1))
|
||
|
|
#define INLINE __inline__ __attribute__((always_inline))
|
||
|
|
#else
|
||
|
|
#define INLINE __inline__
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#elif (defined(_MSC_VER) || defined(__BORLANDC__) || defined(__WATCOMC__))
|
||
|
|
#define INLINE __inline
|
||
|
|
#else
|
||
|
|
#define INLINE
|
||
|
|
#endif
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#if (!defined(__cplusplus)) && (!defined(inline))
|
||
|
|
#define inline INLINE
|
||
|
|
#endif
|
||
|
|
|
||
|
|
//=====================================================================
|
||
|
|
// QUEUE DEFINITION
|
||
|
|
//=====================================================================
|
||
|
|
#ifndef __IQUEUE_DEF__
|
||
|
|
#define __IQUEUE_DEF__
|
||
|
|
|
||
|
|
struct IQUEUEHEAD {
|
||
|
|
struct IQUEUEHEAD *next, *prev;
|
||
|
|
};
|
||
|
|
|
||
|
|
typedef struct IQUEUEHEAD iqueue_head;
|
||
|
|
|
||
|
|
//---------------------------------------------------------------------
|
||
|
|
// queue init
|
||
|
|
//---------------------------------------------------------------------
|
||
|
|
#define IQUEUE_HEAD_INIT(name) \
|
||
|
|
{ \
|
||
|
|
&(name), &(name) \
|
||
|
|
}
|
||
|
|
#define IQUEUE_HEAD(name) struct IQUEUEHEAD name = IQUEUE_HEAD_INIT(name)
|
||
|
|
|
||
|
|
#define IQUEUE_INIT(ptr) ((ptr)->next = (ptr), (ptr)->prev = (ptr))
|
||
|
|
|
||
|
|
#define IOFFSETOF(TYPE, MEMBER) ((size_t) & ((TYPE *) 0)->MEMBER)
|
||
|
|
|
||
|
|
#define ICONTAINEROF(ptr, type, member) ((type *) (((char *) ((type *) ptr)) - IOFFSETOF(type, member)))
|
||
|
|
|
||
|
|
#define IQUEUE_ENTRY(ptr, type, member) ICONTAINEROF(ptr, type, member)
|
||
|
|
|
||
|
|
//---------------------------------------------------------------------
|
||
|
|
// queue operation
|
||
|
|
//---------------------------------------------------------------------
|
||
|
|
#define IQUEUE_ADD(node, head) \
|
||
|
|
((node)->prev = (head), (node)->next = (head)->next, (head)->next->prev = (node), (head)->next = (node))
|
||
|
|
|
||
|
|
#define IQUEUE_ADD_TAIL(node, head) \
|
||
|
|
((node)->prev = (head)->prev, (node)->next = (head), (head)->prev->next = (node), (head)->prev = (node))
|
||
|
|
|
||
|
|
#define IQUEUE_DEL_BETWEEN(p, n) ((n)->prev = (p), (p)->next = (n))
|
||
|
|
|
||
|
|
#define IQUEUE_DEL(entry) \
|
||
|
|
((entry)->next->prev = (entry)->prev, (entry)->prev->next = (entry)->next, (entry)->next = 0, (entry)->prev = 0)
|
||
|
|
|
||
|
|
#define IQUEUE_DEL_INIT(entry) \
|
||
|
|
do { \
|
||
|
|
IQUEUE_DEL(entry); \
|
||
|
|
IQUEUE_INIT(entry); \
|
||
|
|
} while (0)
|
||
|
|
|
||
|
|
#define IQUEUE_IS_EMPTY(entry) ((entry) == (entry)->next)
|
||
|
|
|
||
|
|
#define iqueue_init IQUEUE_INIT
|
||
|
|
#define iqueue_entry IQUEUE_ENTRY
|
||
|
|
#define iqueue_add IQUEUE_ADD
|
||
|
|
#define iqueue_add_tail IQUEUE_ADD_TAIL
|
||
|
|
#define iqueue_del IQUEUE_DEL
|
||
|
|
#define iqueue_del_init IQUEUE_DEL_INIT
|
||
|
|
#define iqueue_is_empty IQUEUE_IS_EMPTY
|
||
|
|
|
||
|
|
#define IQUEUE_FOREACH(iterator, head, TYPE, MEMBER) \
|
||
|
|
for ((iterator) = iqueue_entry((head)->next, TYPE, MEMBER); &((iterator)->MEMBER) != (head); \
|
||
|
|
(iterator) = iqueue_entry((iterator)->MEMBER.next, TYPE, MEMBER))
|
||
|
|
|
||
|
|
#define iqueue_foreach(iterator, head, TYPE, MEMBER) IQUEUE_FOREACH(iterator, head, TYPE, MEMBER)
|
||
|
|
|
||
|
|
#define iqueue_foreach_entry(pos, head) for ((pos) = (head)->next; (pos) != (head); (pos) = (pos)->next)
|
||
|
|
|
||
|
|
#define __iqueue_splice(list, head) \
|
||
|
|
do { \
|
||
|
|
iqueue_head *first = (list)->next, *last = (list)->prev; \
|
||
|
|
iqueue_head *at = (head)->next; \
|
||
|
|
(first)->prev = (head), (head)->next = (first); \
|
||
|
|
(last)->next = (at), (at)->prev = (last); \
|
||
|
|
} while (0)
|
||
|
|
|
||
|
|
#define iqueue_splice(list, head) \
|
||
|
|
do { \
|
||
|
|
if (!iqueue_is_empty(list)) __iqueue_splice(list, head); \
|
||
|
|
} while (0)
|
||
|
|
|
||
|
|
#define iqueue_splice_init(list, head) \
|
||
|
|
do { \
|
||
|
|
iqueue_splice(list, head); \
|
||
|
|
iqueue_init(list); \
|
||
|
|
} while (0)
|
||
|
|
|
||
|
|
#ifdef _MSC_VER
|
||
|
|
#pragma warning(disable : 4311)
|
||
|
|
#pragma warning(disable : 4312)
|
||
|
|
#pragma warning(disable : 4996)
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|
||
|
|
//---------------------------------------------------------------------
|
||
|
|
// BYTE ORDER & ALIGNMENT
|
||
|
|
//---------------------------------------------------------------------
|
||
|
|
#ifndef IWORDS_BIG_ENDIAN
|
||
|
|
#ifdef _BIG_ENDIAN_
|
||
|
|
#if _BIG_ENDIAN_
|
||
|
|
#define IWORDS_BIG_ENDIAN 1
|
||
|
|
#endif
|
||
|
|
#endif
|
||
|
|
#ifndef IWORDS_BIG_ENDIAN
|
||
|
|
#if defined(__hppa__) || defined(__m68k__) || defined(mc68000) || defined(_M_M68K) \
|
||
|
|
|| (defined(__MIPS__) && defined(__MIPSEB__)) || defined(__ppc__) || defined(__POWERPC__) || defined(_M_PPC) \
|
||
|
|
|| defined(__sparc__) || defined(__powerpc__) || defined(__mc68000__) || defined(__s390x__) || defined(__s390__)
|
||
|
|
#define IWORDS_BIG_ENDIAN 1
|
||
|
|
#endif
|
||
|
|
#endif
|
||
|
|
#ifndef IWORDS_BIG_ENDIAN
|
||
|
|
#define IWORDS_BIG_ENDIAN 0
|
||
|
|
#endif
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifndef IWORDS_MUST_ALIGN
|
||
|
|
#if defined(__i386__) || defined(__i386) || defined(_i386_)
|
||
|
|
#define IWORDS_MUST_ALIGN 0
|
||
|
|
#elif defined(_M_IX86) || defined(_X86_) || defined(__x86_64__)
|
||
|
|
#define IWORDS_MUST_ALIGN 0
|
||
|
|
#elif defined(__amd64) || defined(__amd64__)
|
||
|
|
#define IWORDS_MUST_ALIGN 0
|
||
|
|
#else
|
||
|
|
#define IWORDS_MUST_ALIGN 1
|
||
|
|
#endif
|
||
|
|
#endif
|
||
|
|
|
||
|
|
//=====================================================================
|
||
|
|
// SEGMENT
|
||
|
|
//=====================================================================
|
||
|
|
struct IKCPSEG {
|
||
|
|
struct IQUEUEHEAD node;
|
||
|
|
IUINT32 conv;
|
||
|
|
IUINT32 cmd;
|
||
|
|
IUINT32 frg;
|
||
|
|
IUINT32 wnd;
|
||
|
|
IUINT32 ts;
|
||
|
|
IUINT32 sn;
|
||
|
|
IUINT32 una;
|
||
|
|
IUINT32 len;
|
||
|
|
IUINT32 resendts;
|
||
|
|
IUINT32 rto;
|
||
|
|
IUINT32 fastack;
|
||
|
|
IUINT32 xmit;
|
||
|
|
char data[1];
|
||
|
|
};
|
||
|
|
|
||
|
|
//---------------------------------------------------------------------
|
||
|
|
// IKCPCB
|
||
|
|
//---------------------------------------------------------------------
|
||
|
|
struct IKCPCB {
|
||
|
|
IUINT32 conv, mtu, mss, state;
|
||
|
|
IUINT32 snd_una, snd_nxt, rcv_nxt;
|
||
|
|
IUINT32 ts_recent, ts_lastack, ssthresh;
|
||
|
|
IINT32 rx_rttval, rx_srtt, rx_rto, rx_minrto;
|
||
|
|
IUINT32 snd_wnd, rcv_wnd, rmt_wnd, cwnd, probe;
|
||
|
|
IUINT32 current, interval, ts_flush, xmit;
|
||
|
|
IUINT32 nrcv_buf, nsnd_buf;
|
||
|
|
IUINT32 nrcv_que, nsnd_que;
|
||
|
|
IUINT32 nodelay, updated;
|
||
|
|
IUINT32 ts_probe, probe_wait;
|
||
|
|
IUINT32 dead_link, incr;
|
||
|
|
struct IQUEUEHEAD snd_queue;
|
||
|
|
struct IQUEUEHEAD rcv_queue;
|
||
|
|
struct IQUEUEHEAD snd_buf;
|
||
|
|
struct IQUEUEHEAD rcv_buf;
|
||
|
|
IUINT32 *acklist;
|
||
|
|
IUINT32 ackcount;
|
||
|
|
IUINT32 ackblock;
|
||
|
|
void *user;
|
||
|
|
char *buffer;
|
||
|
|
int fastresend;
|
||
|
|
int fastlimit;
|
||
|
|
int nocwnd, stream;
|
||
|
|
int logmask;
|
||
|
|
int (*output)(const char *buf, int len, struct IKCPCB *kcp, void *user);
|
||
|
|
void (*writelog)(const char *log, struct IKCPCB *kcp, void *user);
|
||
|
|
};
|
||
|
|
|
||
|
|
typedef struct IKCPCB ikcpcb;
|
||
|
|
|
||
|
|
#define IKCP_LOG_OUTPUT 1
|
||
|
|
#define IKCP_LOG_INPUT 2
|
||
|
|
#define IKCP_LOG_SEND 4
|
||
|
|
#define IKCP_LOG_RECV 8
|
||
|
|
#define IKCP_LOG_IN_DATA 16
|
||
|
|
#define IKCP_LOG_IN_ACK 32
|
||
|
|
#define IKCP_LOG_IN_PROBE 64
|
||
|
|
#define IKCP_LOG_IN_WINS 128
|
||
|
|
#define IKCP_LOG_OUT_DATA 256
|
||
|
|
#define IKCP_LOG_OUT_ACK 512
|
||
|
|
#define IKCP_LOG_OUT_PROBE 1024
|
||
|
|
#define IKCP_LOG_OUT_WINS 2048
|
||
|
|
|
||
|
|
#ifdef __cplusplus
|
||
|
|
extern "C" {
|
||
|
|
#endif
|
||
|
|
|
||
|
|
//---------------------------------------------------------------------
|
||
|
|
// interface
|
||
|
|
//---------------------------------------------------------------------
|
||
|
|
|
||
|
|
// create a new kcp control object, 'conv' must equal in two endpoint
|
||
|
|
// from the same connection. 'user' will be passed to the output callback
|
||
|
|
// output callback can be setup like this: 'kcp->output = my_udp_output'
|
||
|
|
ikcpcb *ikcp_create(IUINT32 conv, void *user);
|
||
|
|
|
||
|
|
// release kcp control object
|
||
|
|
void ikcp_release(ikcpcb *kcp);
|
||
|
|
|
||
|
|
// set output callback, which will be invoked by kcp
|
||
|
|
void ikcp_setoutput(ikcpcb *kcp, int (*output)(const char *buf, int len, ikcpcb *kcp, void *user));
|
||
|
|
|
||
|
|
// user/upper level recv: returns size, returns below zero for EAGAIN
|
||
|
|
int ikcp_recv(ikcpcb *kcp, char *buffer, int len);
|
||
|
|
|
||
|
|
// user/upper level send, returns below zero for error
|
||
|
|
int ikcp_send(ikcpcb *kcp, const char *buffer, int len);
|
||
|
|
|
||
|
|
// update state (call it repeatedly, every 10ms-100ms), or you can ask
|
||
|
|
// ikcp_check when to call it again (without ikcp_input/_send calling).
|
||
|
|
// 'current' - current timestamp in millisec.
|
||
|
|
void ikcp_update(ikcpcb *kcp, IUINT32 current);
|
||
|
|
|
||
|
|
// Determine when should you invoke ikcp_update:
|
||
|
|
// returns when you should invoke ikcp_update in millisec, if there
|
||
|
|
// is no ikcp_input/_send calling. you can call ikcp_update in that
|
||
|
|
// time, instead of call update repeatly.
|
||
|
|
// Important to reduce unnacessary ikcp_update invoking. use it to
|
||
|
|
// schedule ikcp_update (eg. implementing an epoll-like mechanism,
|
||
|
|
// or optimize ikcp_update when handling massive kcp connections)
|
||
|
|
IUINT32 ikcp_check(const ikcpcb *kcp, IUINT32 current);
|
||
|
|
|
||
|
|
// when you received a low level packet (eg. UDP packet), call it
|
||
|
|
int ikcp_input(ikcpcb *kcp, const char *data, long size);
|
||
|
|
|
||
|
|
// flush pending data
|
||
|
|
void ikcp_flush(ikcpcb *kcp);
|
||
|
|
|
||
|
|
// check the size of next message in the recv queue
|
||
|
|
int ikcp_peeksize(const ikcpcb *kcp);
|
||
|
|
|
||
|
|
// change MTU size, default is 1400
|
||
|
|
int ikcp_setmtu(ikcpcb *kcp, int mtu);
|
||
|
|
|
||
|
|
// set maximum window size: sndwnd=32, rcvwnd=32 by default
|
||
|
|
int ikcp_wndsize(ikcpcb *kcp, int sndwnd, int rcvwnd);
|
||
|
|
|
||
|
|
// get how many packet is waiting to be sent
|
||
|
|
int ikcp_waitsnd(const ikcpcb *kcp);
|
||
|
|
|
||
|
|
// fastest: ikcp_nodelay(kcp, 1, 20, 2, 1)
|
||
|
|
// nodelay: 0:disable(default), 1:enable
|
||
|
|
// interval: internal update timer interval in millisec, default is 100ms
|
||
|
|
// resend: 0:disable fast resend(default), 1:enable fast resend
|
||
|
|
// nc: 0:normal congestion control(default), 1:disable congestion control
|
||
|
|
int ikcp_nodelay(ikcpcb *kcp, int nodelay, int interval, int resend, int nc);
|
||
|
|
|
||
|
|
void ikcp_log(ikcpcb *kcp, int mask, const char *fmt, ...);
|
||
|
|
|
||
|
|
// setup allocator
|
||
|
|
void ikcp_allocator(void *(*new_malloc)(size_t), void (*new_free)(void *));
|
||
|
|
|
||
|
|
// read conv
|
||
|
|
IUINT32 ikcp_getconv(const void *ptr);
|
||
|
|
|
||
|
|
#ifdef __cplusplus
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif
|