tcp.h

Revision 14, 20.2 kB (checked in by phil, 15 years ago)
added unmodified FreeRTOS package V5.4.1 with only web srv demo source for LPC2368 for CrossWorks?

Line
1	/*
2	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
3	* All rights reserved.
4	*
5	* Redistribution and use in source and binary forms, with or without modification,
6	* are permitted provided that the following conditions are met:
7	*
8	* 1. Redistributions of source code must retain the above copyright notice,
9	* this list of conditions and the following disclaimer.
10	* 2. Redistributions in binary form must reproduce the above copyright notice,
11	* this list of conditions and the following disclaimer in the documentation
12	* and/or other materials provided with the distribution.
13	* 3. The name of the author may not be used to endorse or promote products
14	* derived from this software without specific prior written permission.
15	*
16	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
17	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
19	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
20	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
21	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
22	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
23	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
24	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
25	* OF SUCH DAMAGE.
26	*
27	* This file is part of the lwIP TCP/IP stack.
28	*
29	* Author: Adam Dunkels <adam@sics.se>
30	*
31	*/
32	#ifndef __LWIP_TCP_H__
33	#define __LWIP_TCP_H__
34
35	#include "lwip/sys.h"
36	#include "lwip/mem.h"
37
38	#include "lwip/pbuf.h"
39	#include "lwip/opt.h"
40	#include "lwip/ip.h"
41	#include "lwip/icmp.h"
42
43	#include "lwip/err.h"
44
45	struct tcp_pcb;
46
47	/* Functions for interfacing with TCP: */
48
49	/* Lower layer interface to TCP: */
50	void tcp_init (void); /* Must be called first to
51	initialize TCP. */
52	void tcp_tmr (void); /* Must be called every
53	TCP_TMR_INTERVAL
54	ms. (Typically 250 ms). */
55	/* Application program's interface: */
56	struct tcp_pcb * tcp_new (void);
57	struct tcp_pcb * tcp_alloc (u8_t prio);
58
59	void tcp_arg (struct tcp_pcb pcb, void arg);
60	void tcp_accept (struct tcp_pcb *pcb,
61	err_t (* accept)(void arg, struct tcp_pcb newpcb,
62	err_t err));
63	void tcp_recv (struct tcp_pcb *pcb,
64	err_t (* recv)(void arg, struct tcp_pcb tpcb,
65	struct pbuf *p, err_t err));
66	void tcp_sent (struct tcp_pcb *pcb,
67	err_t (* sent)(void arg, struct tcp_pcb tpcb,
68	u16_t len));
69	void tcp_poll (struct tcp_pcb *pcb,
70	err_t (* poll)(void arg, struct tcp_pcb tpcb),
71	u8_t interval);
72	void tcp_err (struct tcp_pcb *pcb,
73	void (* err)(void *arg, err_t err));
74
75	#define tcp_mss(pcb) ((pcb)->mss)
76	#define tcp_sndbuf(pcb) ((pcb)->snd_buf)
77
78	void tcp_recved (struct tcp_pcb *pcb, u16_t len);
79	err_t tcp_bind (struct tcp_pcb pcb, struct ip_addr ipaddr,
80	u16_t port);
81	err_t tcp_connect (struct tcp_pcb pcb, struct ip_addr ipaddr,
82	u16_t port, err_t (* connected)(void *arg,
83	struct tcp_pcb *tpcb,
84	err_t err));
85	struct tcp_pcb * tcp_listen (struct tcp_pcb *pcb);
86	void tcp_abort (struct tcp_pcb *pcb);
87	err_t tcp_close (struct tcp_pcb *pcb);
88	err_t tcp_write (struct tcp_pcb pcb, const void dataptr, u16_t len,
89	u8_t copy);
90
91	void tcp_setprio (struct tcp_pcb *pcb, u8_t prio);
92
93	#define TCP_PRIO_MIN 1
94	#define TCP_PRIO_NORMAL 64
95	#define TCP_PRIO_MAX 127
96
97	/* It is also possible to call these two functions at the right
98	intervals (instead of calling tcp_tmr()). */
99	void tcp_slowtmr (void);
100	void tcp_fasttmr (void);
101
102
103	/* Only used by IP to pass a TCP segment to TCP: */
104	void tcp_input (struct pbuf p, struct netif inp);
105	/* Used within the TCP code only: */
106	err_t tcp_output (struct tcp_pcb *pcb);
107	void tcp_rexmit (struct tcp_pcb *pcb);
108	void tcp_rexmit_rto (struct tcp_pcb *pcb);
109
110
111
112	#define TCP_SEQ_LT(a,b) ((s32_t)((a)-(b)) < 0)
113	#define TCP_SEQ_LEQ(a,b) ((s32_t)((a)-(b)) <= 0)
114	#define TCP_SEQ_GT(a,b) ((s32_t)((a)-(b)) > 0)
115	#define TCP_SEQ_GEQ(a,b) ((s32_t)((a)-(b)) >= 0)
116	/* is b<=a<=c? */
117	#if 0 /* see bug #10548 */
118	#define TCP_SEQ_BETWEEN(a,b,c) ((c)-(b) >= (a)-(b))
119	#endif
120	#define TCP_SEQ_BETWEEN(a,b,c) (TCP_SEQ_GEQ(a,b) && TCP_SEQ_LEQ(a,c))
121	#define TCP_FIN 0x01U
122	#define TCP_SYN 0x02U
123	#define TCP_RST 0x04U
124	#define TCP_PSH 0x08U
125	#define TCP_ACK 0x10U
126	#define TCP_URG 0x20U
127	#define TCP_ECE 0x40U
128	#define TCP_CWR 0x80U
129
130	#define TCP_FLAGS 0x3fU
131
132	/* Length of the TCP header, excluding options. */
133	#define TCP_HLEN 20
134
135	#ifndef TCP_TMR_INTERVAL
136	#define TCP_TMR_INTERVAL 250 /* The TCP timer interval in
137	milliseconds. */
138	#endif /* TCP_TMR_INTERVAL */
139
140	#ifndef TCP_FAST_INTERVAL
141	#define TCP_FAST_INTERVAL TCP_TMR_INTERVAL /* the fine grained timeout in
142	milliseconds */
143	#endif /* TCP_FAST_INTERVAL */
144
145	#ifndef TCP_SLOW_INTERVAL
146	#define TCP_SLOW_INTERVAL (2TCP_TMR_INTERVAL) / the coarse grained timeout in
147	milliseconds */
148	#endif /* TCP_SLOW_INTERVAL */
149
150	#define TCP_FIN_WAIT_TIMEOUT 20000 /* milliseconds */
151	#define TCP_SYN_RCVD_TIMEOUT 20000 /* milliseconds */
152
153	#define TCP_OOSEQ_TIMEOUT 6U /* x RTO */
154
155	#define TCP_MSL 60000 /* The maximum segment lifetime in microseconds */
156
157	/*
158	* User-settable options (used with setsockopt).
159	*/
160	#define TCP_NODELAY 0x01 /* don't delay send to coalesce packets */
161	#define TCP_KEEPALIVE 0x02 /* send KEEPALIVE probes when idle for pcb->keepalive miliseconds */
162
163	/* Keepalive values */
164	#define TCP_KEEPDEFAULT 7200000 /* KEEPALIVE timer in miliseconds */
165	#define TCP_KEEPINTVL 75000 /* Time between KEEPALIVE probes in miliseconds */
166	#define TCP_KEEPCNT 9 /* Counter for KEEPALIVE probes */
167	#define TCP_MAXIDLE TCP_KEEPCNT * TCP_KEEPINTVL /* Maximum KEEPALIVE probe time */
168
169
170	#ifdef PACK_STRUCT_USE_INCLUDES
171	# include "arch/bpstruct.h"
172	#endif
173	PACK_STRUCT_BEGIN
174	struct tcp_hdr {
175	PACK_STRUCT_FIELD(u16_t src);
176	PACK_STRUCT_FIELD(u16_t dest);
177	PACK_STRUCT_FIELD(u32_t seqno);
178	PACK_STRUCT_FIELD(u32_t ackno);
179	PACK_STRUCT_FIELD(u16_t _hdrlen_rsvd_flags);
180	PACK_STRUCT_FIELD(u16_t wnd);
181	PACK_STRUCT_FIELD(u16_t chksum);
182	PACK_STRUCT_FIELD(u16_t urgp);
183	} PACK_STRUCT_STRUCT;
184	PACK_STRUCT_END
185	#ifdef PACK_STRUCT_USE_INCLUDES
186	# include "arch/epstruct.h"
187	#endif
188
189	#define TCPH_OFFSET(phdr) (ntohs((phdr)->_hdrlen_rsvd_flags) >> 8)
190	#define TCPH_HDRLEN(phdr) (ntohs((phdr)->_hdrlen_rsvd_flags) >> 12)
191	#define TCPH_FLAGS(phdr) (ntohs((phdr)->_hdrlen_rsvd_flags) & TCP_FLAGS)
192
193	#define TCPH_OFFSET_SET(phdr, offset) (phdr)->_hdrlen_rsvd_flags = htons(((offset) << 8) \| TCPH_FLAGS(phdr))
194	#define TCPH_HDRLEN_SET(phdr, len) (phdr)->_hdrlen_rsvd_flags = htons(((len) << 12) \| TCPH_FLAGS(phdr))
195	#define TCPH_FLAGS_SET(phdr, flags) (phdr)->_hdrlen_rsvd_flags = htons((ntohs((phdr)->_hdrlen_rsvd_flags) & ~TCP_FLAGS) \| (flags))
196	#define TCPH_SET_FLAG(phdr, flags ) (phdr)->_hdrlen_rsvd_flags = htons(ntohs((phdr)->_hdrlen_rsvd_flags) \| (flags))
197	#define TCPH_UNSET_FLAG(phdr, flags) (phdr)->_hdrlen_rsvd_flags = htons(ntohs((phdr)->_hdrlen_rsvd_flags) \| (TCPH_FLAGS(phdr) & ~(flags)) )
198
199	#define TCP_TCPLEN(seg) ((seg)->len + ((TCPH_FLAGS((seg)->tcphdr) & TCP_FIN \|\| \
200	TCPH_FLAGS((seg)->tcphdr) & TCP_SYN)? 1: 0))
201
202	enum tcp_state {
203	CLOSED = 0,
204	LISTEN = 1,
205	SYN_SENT = 2,
206	SYN_RCVD = 3,
207	ESTABLISHED = 4,
208	FIN_WAIT_1 = 5,
209	FIN_WAIT_2 = 6,
210	CLOSE_WAIT = 7,
211	CLOSING = 8,
212	LAST_ACK = 9,
213	TIME_WAIT = 10
214	};
215
216	/* the TCP protocol control block */
217	struct tcp_pcb {
218	/** common PCB members */
219	IP_PCB;
220	/** protocol specific PCB members */
221	struct tcp_pcb next; / for the linked list */
222	enum tcp_state state; /* TCP state */
223	u8_t prio;
224	void *callback_arg;
225
226	u16_t local_port;
227	u16_t remote_port;
228
229	u8_t flags;
230	#define TF_ACK_DELAY (u8_t)0x01U /* Delayed ACK. */
231	#define TF_ACK_NOW (u8_t)0x02U /* Immediate ACK. */
232	#define TF_INFR (u8_t)0x04U /* In fast recovery. */
233	#define TF_RESET (u8_t)0x08U /* Connection was reset. */
234	#define TF_CLOSED (u8_t)0x10U /* Connection was sucessfully closed. */
235	#define TF_GOT_FIN (u8_t)0x20U /* Connection was closed by the remote end. */
236	#define TF_NODELAY (u8_t)0x40U /* Disable Nagle algorithm */
237
238	/* receiver variables */
239	u32_t rcv_nxt; /* next seqno expected */
240	u16_t rcv_wnd; /* receiver window */
241
242	/* Timers */
243	u32_t tmr;
244	u8_t polltmr, pollinterval;
245
246	/* Retransmission timer. */
247	u16_t rtime;
248
249	u16_t mss; /* maximum segment size */
250
251	/* RTT (round trip time) estimation variables */
252	u32_t rttest; /* RTT estimate in 500ms ticks */
253	u32_t rtseq; /* sequence number being timed */
254	s16_t sa, sv; /* @todo document this */
255
256	u16_t rto; /* retransmission time-out */
257	u8_t nrtx; /* number of retransmissions */
258
259	/* fast retransmit/recovery */
260	u32_t lastack; /* Highest acknowledged seqno. */
261	u8_t dupacks;
262
263	/* congestion avoidance/control variables */
264	u16_t cwnd;
265	u16_t ssthresh;
266
267	/* sender variables */
268	u32_t snd_nxt, /* next seqno to be sent */
269	snd_max, /* Highest seqno sent. */
270	snd_wnd, /* sender window */
271	snd_wl1, snd_wl2, /* Sequence and acknowledgement numbers of last
272	window update. */
273	snd_lbb; /* Sequence number of next byte to be buffered. */
274
275	u16_t acked;
276
277	u16_t snd_buf; /* Available buffer space for sending (in bytes). */
278	u8_t snd_queuelen; /* Available buffer space for sending (in tcp_segs). */
279
280
281	/* These are ordered by sequence number: */
282	struct tcp_seg unsent; / Unsent (queued) segments. */
283	struct tcp_seg unacked; / Sent but unacknowledged segments. */
284	#if TCP_QUEUE_OOSEQ
285	struct tcp_seg ooseq; / Received out of sequence segments. */
286	#endif /* TCP_QUEUE_OOSEQ */
287
288	#if LWIP_CALLBACK_API
289	/* Function to be called when more send buffer space is available. */
290	err_t (* sent)(void arg, struct tcp_pcb pcb, u16_t space);
291
292	/* Function to be called when (in-sequence) data has arrived. */
293	err_t (* recv)(void arg, struct tcp_pcb pcb, struct pbuf *p, err_t err);
294
295	/* Function to be called when a connection has been set up. */
296	err_t (* connected)(void arg, struct tcp_pcb pcb, err_t err);
297
298	/* Function to call when a listener has been connected. */
299	err_t (* accept)(void arg, struct tcp_pcb newpcb, err_t err);
300
301	/* Function which is called periodically. */
302	err_t (* poll)(void arg, struct tcp_pcb pcb);
303
304	/* Function to be called whenever a fatal error occurs. */
305	void (* errf)(void *arg, err_t err);
306	#endif /* LWIP_CALLBACK_API */
307
308	/* idle time before KEEPALIVE is sent */
309	u32_t keepalive;
310
311	/* KEEPALIVE counter */
312	u8_t keep_cnt;
313	};
314
315	struct tcp_pcb_listen {
316	/* Common members of all PCB types */
317	IP_PCB;
318
319	/* Protocol specific PCB members */
320	struct tcp_pcb_listen next; / for the linked list */
321
322	/* Even if state is obviously LISTEN this is here for
323	* field compatibility with tpc_pcb to which it is cast sometimes
324	* Until a cleaner solution emerges this is here.FIXME
325	*/
326	enum tcp_state state; /* TCP state */
327
328	u8_t prio;
329	void *callback_arg;
330
331	u16_t local_port;
332
333	#if LWIP_CALLBACK_API
334	/* Function to call when a listener has been connected. */
335	err_t (* accept)(void arg, struct tcp_pcb newpcb, err_t err);
336	#endif /* LWIP_CALLBACK_API */
337	};
338
339	#if LWIP_EVENT_API
340
341	enum lwip_event {
342	LWIP_EVENT_ACCEPT,
343	LWIP_EVENT_SENT,
344	LWIP_EVENT_RECV,
345	LWIP_EVENT_CONNECTED,
346	LWIP_EVENT_POLL,
347	LWIP_EVENT_ERR
348	};
349
350	err_t lwip_tcp_event(void arg, struct tcp_pcb pcb,
351	enum lwip_event,
352	struct pbuf *p,
353	u16_t size,
354	err_t err);
355
356	#define TCP_EVENT_ACCEPT(pcb,err,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\
357	LWIP_EVENT_ACCEPT, NULL, 0, err)
358	#define TCP_EVENT_SENT(pcb,space,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\
359	LWIP_EVENT_SENT, NULL, space, ERR_OK)
360	#define TCP_EVENT_RECV(pcb,p,err,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\
361	LWIP_EVENT_RECV, (p), 0, (err))
362	#define TCP_EVENT_CONNECTED(pcb,err,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\
363	LWIP_EVENT_CONNECTED, NULL, 0, (err))
364	#define TCP_EVENT_POLL(pcb,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\
365	LWIP_EVENT_POLL, NULL, 0, ERR_OK)
366	#define TCP_EVENT_ERR(errf,arg,err) lwip_tcp_event((arg), NULL, \
367	LWIP_EVENT_ERR, NULL, 0, (err))
368	#else /* LWIP_EVENT_API */
369	#define TCP_EVENT_ACCEPT(pcb,err,ret) \
370	if((pcb)->accept != NULL) \
371	(ret = (pcb)->accept((pcb)->callback_arg,(pcb),(err)))
372	#define TCP_EVENT_SENT(pcb,space,ret) \
373	if((pcb)->sent != NULL) \
374	(ret = (pcb)->sent((pcb)->callback_arg,(pcb),(space)))
375	#define TCP_EVENT_RECV(pcb,p,err,ret) \
376	if((pcb)->recv != NULL) \
377	{ ret = (pcb)->recv((pcb)->callback_arg,(pcb),(p),(err)); } else { \
378	if (p) pbuf_free(p); }
379	#define TCP_EVENT_CONNECTED(pcb,err,ret) \
380	if((pcb)->connected != NULL) \
381	(ret = (pcb)->connected((pcb)->callback_arg,(pcb),(err)))
382	#define TCP_EVENT_POLL(pcb,ret) \
383	if((pcb)->poll != NULL) \
384	(ret = (pcb)->poll((pcb)->callback_arg,(pcb)))
385	#define TCP_EVENT_ERR(errf,arg,err) \
386	if((errf) != NULL) \
387	(errf)((arg),(err))
388	#endif /* LWIP_EVENT_API */
389
390	/* This structure represents a TCP segment on the unsent and unacked queues */
391	struct tcp_seg {
392	struct tcp_seg next; / used when putting segements on a queue */
393	struct pbuf p; / buffer containing data + TCP header */
394	void dataptr; / pointer to the TCP data in the pbuf */
395	u16_t len; /* the TCP length of this segment */
396	struct tcp_hdr tcphdr; / the TCP header */
397	};
398
399	/* Internal functions and global variables: */
400	struct tcp_pcb tcp_pcb_copy(struct tcp_pcb pcb);
401	void tcp_pcb_purge(struct tcp_pcb *pcb);
402	void tcp_pcb_remove(struct tcp_pcb *pcblist, struct tcp_pcb pcb);
403
404	u8_t tcp_segs_free(struct tcp_seg *seg);
405	u8_t tcp_seg_free(struct tcp_seg *seg);
406	struct tcp_seg tcp_seg_copy(struct tcp_seg seg);
407
408	#define tcp_ack(pcb) if((pcb)->flags & TF_ACK_DELAY) { \
409	(pcb)->flags &= ~TF_ACK_DELAY; \
410	(pcb)->flags \|= TF_ACK_NOW; \
411	tcp_output(pcb); \
412	} else { \
413	(pcb)->flags \|= TF_ACK_DELAY; \
414	}
415
416	#define tcp_ack_now(pcb) (pcb)->flags \|= TF_ACK_NOW; \
417	tcp_output(pcb)
418
419	err_t tcp_send_ctrl(struct tcp_pcb *pcb, u8_t flags);
420	err_t tcp_enqueue(struct tcp_pcb pcb, void dataptr, u16_t len,
421	u8_t flags, u8_t copy,
422	u8_t *optdata, u8_t optlen);
423
424	void tcp_rexmit_seg(struct tcp_pcb pcb, struct tcp_seg seg);
425
426	void tcp_rst(u32_t seqno, u32_t ackno,
427	struct ip_addr local_ip, struct ip_addr remote_ip,
428	u16_t local_port, u16_t remote_port);
429
430	u32_t tcp_next_iss(void);
431
432	void tcp_keepalive(struct tcp_pcb *pcb);
433
434	extern struct tcp_pcb *tcp_input_pcb;
435	extern u32_t tcp_ticks;
436
437	#if TCP_DEBUG \|\| TCP_INPUT_DEBUG \|\| TCP_OUTPUT_DEBUG
438	void tcp_debug_print(struct tcp_hdr *tcphdr);
439	void tcp_debug_print_flags(u8_t flags);
440	void tcp_debug_print_state(enum tcp_state s);
441	void tcp_debug_print_pcbs(void);
442	s16_t tcp_pcbs_sane(void);
443	#else
444	# define tcp_debug_print(tcphdr)
445	# define tcp_debug_print_flags(flags)
446	# define tcp_debug_print_state(s)
447	# define tcp_debug_print_pcbs()
448	# define tcp_pcbs_sane() 1
449	#endif /* TCP_DEBUG */
450
451	#if NO_SYS
452	#define tcp_timer_needed()
453	#else
454	void tcp_timer_needed(void);
455	#endif
456
457	/* The TCP PCB lists. */
458	union tcp_listen_pcbs_t { /* List of all TCP PCBs in LISTEN state. */
459	struct tcp_pcb_listen *listen_pcbs;
460	struct tcp_pcb *pcbs;
461	};
462	extern union tcp_listen_pcbs_t tcp_listen_pcbs;
463	extern struct tcp_pcb tcp_active_pcbs; / List of all TCP PCBs that are in a
464	state in which they accept or send
465	data. */
466	extern struct tcp_pcb tcp_tw_pcbs; / List of all TCP PCBs in TIME-WAIT. */
467
468	extern struct tcp_pcb tcp_tmp_pcb; / Only used for temporary storage. */
469
470	/* Axioms about the above lists:
471	1) Every TCP PCB that is not CLOSED is in one of the lists.
472	2) A PCB is only in one of the lists.
473	3) All PCBs in the tcp_listen_pcbs list is in LISTEN state.
474	4) All PCBs in the tcp_tw_pcbs list is in TIME-WAIT state.
475	*/
476
477	/* Define two macros, TCP_REG and TCP_RMV that registers a TCP PCB
478	with a PCB list or removes a PCB from a list, respectively. */
479	#if 0
480	#define TCP_REG(pcbs, npcb) do {\
481	LWIP_DEBUGF(TCP_DEBUG, ("TCP_REG %p local port %d\n", npcb, npcb->local_port)); \
482	for(tcp_tmp_pcb = *pcbs; \
483	tcp_tmp_pcb != NULL; \
484	tcp_tmp_pcb = tcp_tmp_pcb->next) { \
485	LWIP_ASSERT("TCP_REG: already registered\n", tcp_tmp_pcb != npcb); \
486	} \
487	LWIP_ASSERT("TCP_REG: pcb->state != CLOSED", npcb->state != CLOSED); \
488	npcb->next = *pcbs; \
489	LWIP_ASSERT("TCP_REG: npcb->next != npcb", npcb->next != npcb); \
490	*(pcbs) = npcb; \
491	LWIP_ASSERT("TCP_RMV: tcp_pcbs sane", tcp_pcbs_sane()); \
492	tcp_timer_needed(); \
493	} while(0)
494	#define TCP_RMV(pcbs, npcb) do { \
495	LWIP_ASSERT("TCP_RMV: pcbs != NULL", *pcbs != NULL); \
496	LWIP_DEBUGF(TCP_DEBUG, ("TCP_RMV: removing %p from %p\n", npcb, *pcbs)); \
497	if(*pcbs == npcb) { \
498	pcbs = (pcbs)->next; \
499	} else for(tcp_tmp_pcb = *pcbs; tcp_tmp_pcb != NULL; tcp_tmp_pcb = tcp_tmp_pcb->next) { \
500	if(tcp_tmp_pcb->next != NULL && tcp_tmp_pcb->next == npcb) { \
501	tcp_tmp_pcb->next = npcb->next; \
502	break; \
503	} \
504	} \
505	npcb->next = NULL; \
506	LWIP_ASSERT("TCP_RMV: tcp_pcbs sane", tcp_pcbs_sane()); \
507	LWIP_DEBUGF(TCP_DEBUG, ("TCP_RMV: removed %p from %p\n", npcb, *pcbs)); \
508	} while(0)
509
510	#else /* LWIP_DEBUG */
511	#define TCP_REG(pcbs, npcb) do { \
512	npcb->next = *pcbs; \
513	*(pcbs) = npcb; \
514	tcp_timer_needed(); \
515	} while(0)
516	#define TCP_RMV(pcbs, npcb) do { \
517	if(*(pcbs) == npcb) { \
518	((pcbs)) = (pcbs)->next; \
519	} else for(tcp_tmp_pcb = *pcbs; tcp_tmp_pcb != NULL; tcp_tmp_pcb = tcp_tmp_pcb->next) { \
520	if(tcp_tmp_pcb->next != NULL && tcp_tmp_pcb->next == npcb) { \
521	tcp_tmp_pcb->next = npcb->next; \
522	break; \
523	} \
524	} \
525	npcb->next = NULL; \
526	} while(0)
527	#endif /* LWIP_DEBUG */
528	#endif /* __LWIP_TCP_H__ */
529
530
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root/webserver/example/freeRTOSexample/EnergyMeters/Common/ethernet/lwIP/include/lwip/tcp.h

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