Prusa MINI Firmware overview
tcp_priv.h
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1 /**
2  * @file
3  * TCP internal implementations (do not use in application code)
4  */
5 
6 /*
7  * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
8  * All rights reserved.
9  *
10  * Redistribution and use in source and binary forms, with or without modification,
11  * are permitted provided that the following conditions are met:
12  *
13  * 1. Redistributions of source code must retain the above copyright notice,
14  * this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright notice,
16  * this list of conditions and the following disclaimer in the documentation
17  * and/or other materials provided with the distribution.
18  * 3. The name of the author may not be used to endorse or promote products
19  * derived from this software without specific prior written permission.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
22  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
23  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
24  * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
26  * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
29  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
30  * OF SUCH DAMAGE.
31  *
32  * This file is part of the lwIP TCP/IP stack.
33  *
34  * Author: Adam Dunkels <adam@sics.se>
35  *
36  */
37 #ifndef LWIP_HDR_TCP_PRIV_H
38 #define LWIP_HDR_TCP_PRIV_H
39 
40 #include "lwip/opt.h"
41 
42 #if LWIP_TCP /* don't build if not configured for use in lwipopts.h */
43 
44 #include "lwip/tcp.h"
45 #include "lwip/mem.h"
46 #include "lwip/pbuf.h"
47 #include "lwip/ip.h"
48 #include "lwip/icmp.h"
49 #include "lwip/err.h"
50 #include "lwip/ip6.h"
51 #include "lwip/ip6_addr.h"
52 #include "lwip/prot/tcp.h"
53 
54 #ifdef __cplusplus
55 extern "C" {
56 #endif
57 
58 /* Functions for interfacing with TCP: */
59 
60 /* Lower layer interface to TCP: */
61 void tcp_init (void); /* Initialize this module. */
62 void tcp_tmr (void); /* Must be called every
63  TCP_TMR_INTERVAL
64  ms. (Typically 250 ms). */
65 /* It is also possible to call these two functions at the right
66  intervals (instead of calling tcp_tmr()). */
67 void tcp_slowtmr (void);
68 void tcp_fasttmr (void);
69 
70 /* Call this from a netif driver (watch out for threading issues!) that has
71  returned a memory error on transmit and now has free buffers to send more.
72  This iterates all active pcbs that had an error and tries to call
73  tcp_output, so use this with care as it might slow down the system. */
74 void tcp_txnow (void);
75 
76 /* Only used by IP to pass a TCP segment to TCP: */
77 void tcp_input (struct pbuf *p, struct netif *inp);
78 /* Used within the TCP code only: */
79 struct tcp_pcb * tcp_alloc (u8_t prio);
80 void tcp_abandon (struct tcp_pcb *pcb, int reset);
81 err_t tcp_send_empty_ack(struct tcp_pcb *pcb);
82 void tcp_rexmit (struct tcp_pcb *pcb);
83 void tcp_rexmit_rto (struct tcp_pcb *pcb);
84 void tcp_rexmit_fast (struct tcp_pcb *pcb);
85 u32_t tcp_update_rcv_ann_wnd(struct tcp_pcb *pcb);
86 err_t tcp_process_refused_data(struct tcp_pcb *pcb);
87 
88 /**
89  * This is the Nagle algorithm: try to combine user data to send as few TCP
90  * segments as possible. Only send if
91  * - no previously transmitted data on the connection remains unacknowledged or
92  * - the TF_NODELAY flag is set (nagle algorithm turned off for this pcb) or
93  * - the only unsent segment is at least pcb->mss bytes long (or there is more
94  * than one unsent segment - with lwIP, this can happen although unsent->len < mss)
95  * - or if we are in fast-retransmit (TF_INFR)
96  */
97 #define tcp_do_output_nagle(tpcb) ((((tpcb)->unacked == NULL) || \
98  ((tpcb)->flags & (TF_NODELAY | TF_INFR)) || \
99  (((tpcb)->unsent != NULL) && (((tpcb)->unsent->next != NULL) || \
100  ((tpcb)->unsent->len >= (tpcb)->mss))) || \
101  ((tcp_sndbuf(tpcb) == 0) || (tcp_sndqueuelen(tpcb) >= TCP_SND_QUEUELEN)) \
102  ) ? 1 : 0)
103 #define tcp_output_nagle(tpcb) (tcp_do_output_nagle(tpcb) ? tcp_output(tpcb) : ERR_OK)
104 
105 
106 #define TCP_SEQ_LT(a,b) ((s32_t)((u32_t)(a) - (u32_t)(b)) < 0)
107 #define TCP_SEQ_LEQ(a,b) ((s32_t)((u32_t)(a) - (u32_t)(b)) <= 0)
108 #define TCP_SEQ_GT(a,b) ((s32_t)((u32_t)(a) - (u32_t)(b)) > 0)
109 #define TCP_SEQ_GEQ(a,b) ((s32_t)((u32_t)(a) - (u32_t)(b)) >= 0)
110 /* is b<=a<=c? */
111 #if 0 /* see bug #10548 */
112 #define TCP_SEQ_BETWEEN(a,b,c) ((c)-(b) >= (a)-(b))
113 #endif
114 #define TCP_SEQ_BETWEEN(a,b,c) (TCP_SEQ_GEQ(a,b) && TCP_SEQ_LEQ(a,c))
115 
116 #ifndef TCP_TMR_INTERVAL
117 #define TCP_TMR_INTERVAL 250 /* The TCP timer interval in milliseconds. */
118 #endif /* TCP_TMR_INTERVAL */
119 
120 #ifndef TCP_FAST_INTERVAL
121 #define TCP_FAST_INTERVAL TCP_TMR_INTERVAL /* the fine grained timeout in milliseconds */
122 #endif /* TCP_FAST_INTERVAL */
123 
124 #ifndef TCP_SLOW_INTERVAL
125 #define TCP_SLOW_INTERVAL (2*TCP_TMR_INTERVAL) /* the coarse grained timeout in milliseconds */
126 #endif /* TCP_SLOW_INTERVAL */
127 
128 #define TCP_FIN_WAIT_TIMEOUT 20000 /* milliseconds */
129 #define TCP_SYN_RCVD_TIMEOUT 20000 /* milliseconds */
130 
131 #define TCP_OOSEQ_TIMEOUT 6U /* x RTO */
132 
133 #ifndef TCP_MSL
134 #define TCP_MSL 60000UL /* The maximum segment lifetime in milliseconds */
135 #endif
136 
137 /* Keepalive values, compliant with RFC 1122. Don't change this unless you know what you're doing */
138 #ifndef TCP_KEEPIDLE_DEFAULT
139 #define TCP_KEEPIDLE_DEFAULT 7200000UL /* Default KEEPALIVE timer in milliseconds */
140 #endif
141 
142 #ifndef TCP_KEEPINTVL_DEFAULT
143 #define TCP_KEEPINTVL_DEFAULT 75000UL /* Default Time between KEEPALIVE probes in milliseconds */
144 #endif
145 
146 #ifndef TCP_KEEPCNT_DEFAULT
147 #define TCP_KEEPCNT_DEFAULT 9U /* Default Counter for KEEPALIVE probes */
148 #endif
149 
150 #define TCP_MAXIDLE TCP_KEEPCNT_DEFAULT * TCP_KEEPINTVL_DEFAULT /* Maximum KEEPALIVE probe time */
151 
152 #define TCP_TCPLEN(seg) ((seg)->len + (((TCPH_FLAGS((seg)->tcphdr) & (TCP_FIN | TCP_SYN)) != 0) ? 1U : 0U))
153 
154 /** Flags used on input processing, not on pcb->flags
155 */
156 #define TF_RESET (u8_t)0x08U /* Connection was reset. */
157 #define TF_CLOSED (u8_t)0x10U /* Connection was successfully closed. */
158 #define TF_GOT_FIN (u8_t)0x20U /* Connection was closed by the remote end. */
159 
160 
161 #if LWIP_EVENT_API
162 
163 #define TCP_EVENT_ACCEPT(lpcb,pcb,arg,err,ret) ret = lwip_tcp_event(arg, (pcb),\
164  LWIP_EVENT_ACCEPT, NULL, 0, err)
165 #define TCP_EVENT_SENT(pcb,space,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\
166  LWIP_EVENT_SENT, NULL, space, ERR_OK)
167 #define TCP_EVENT_RECV(pcb,p,err,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\
168  LWIP_EVENT_RECV, (p), 0, (err))
169 #define TCP_EVENT_CLOSED(pcb,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\
170  LWIP_EVENT_RECV, NULL, 0, ERR_OK)
171 #define TCP_EVENT_CONNECTED(pcb,err,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\
172  LWIP_EVENT_CONNECTED, NULL, 0, (err))
173 #define TCP_EVENT_POLL(pcb,ret) do { if ((pcb)->state != SYN_RCVD) { \
174  ret = lwip_tcp_event((pcb)->callback_arg, (pcb), LWIP_EVENT_POLL, NULL, 0, ERR_OK); \
175  } else { \
176  ret = ERR_ARG; } } while(0)
177 #define TCP_EVENT_ERR(last_state,errf,arg,err) do { if (last_state != SYN_RCVD) { \
178  lwip_tcp_event((arg), NULL, LWIP_EVENT_ERR, NULL, 0, (err)); } } while(0)
179 
180 #else /* LWIP_EVENT_API */
181 
182 #define TCP_EVENT_ACCEPT(lpcb,pcb,arg,err,ret) \
183  do { \
184  if((lpcb)->accept != NULL) \
185  (ret) = (lpcb)->accept((arg),(pcb),(err)); \
186  else (ret) = ERR_ARG; \
187  } while (0)
188 
189 #define TCP_EVENT_SENT(pcb,space,ret) \
190  do { \
191  if((pcb)->sent != NULL) \
192  (ret) = (pcb)->sent((pcb)->callback_arg,(pcb),(space)); \
193  else (ret) = ERR_OK; \
194  } while (0)
195 
196 #define TCP_EVENT_RECV(pcb,p,err,ret) \
197  do { \
198  if((pcb)->recv != NULL) { \
199  (ret) = (pcb)->recv((pcb)->callback_arg,(pcb),(p),(err));\
200  } else { \
201  (ret) = tcp_recv_null(NULL, (pcb), (p), (err)); \
202  } \
203  } while (0)
204 
205 #define TCP_EVENT_CLOSED(pcb,ret) \
206  do { \
207  if(((pcb)->recv != NULL)) { \
208  (ret) = (pcb)->recv((pcb)->callback_arg,(pcb),NULL,ERR_OK);\
209  } else { \
210  (ret) = ERR_OK; \
211  } \
212  } while (0)
213 
214 #define TCP_EVENT_CONNECTED(pcb,err,ret) \
215  do { \
216  if((pcb)->connected != NULL) \
217  (ret) = (pcb)->connected((pcb)->callback_arg,(pcb),(err)); \
218  else (ret) = ERR_OK; \
219  } while (0)
220 
221 #define TCP_EVENT_POLL(pcb,ret) \
222  do { \
223  if((pcb)->poll != NULL) \
224  (ret) = (pcb)->poll((pcb)->callback_arg,(pcb)); \
225  else (ret) = ERR_OK; \
226  } while (0)
227 
228 #define TCP_EVENT_ERR(last_state,errf,arg,err) \
229  do { \
230  LWIP_UNUSED_ARG(last_state); \
231  if((errf) != NULL) \
232  (errf)((arg),(err)); \
233  } while (0)
234 
235 #endif /* LWIP_EVENT_API */
236 
237 /** Enabled extra-check for TCP_OVERSIZE if LWIP_DEBUG is enabled */
238 #if TCP_OVERSIZE && defined(LWIP_DEBUG)
239 #define TCP_OVERSIZE_DBGCHECK 1
240 #else
241 #define TCP_OVERSIZE_DBGCHECK 0
242 #endif
243 
244 /** Don't generate checksum on copy if CHECKSUM_GEN_TCP is disabled */
245 #define TCP_CHECKSUM_ON_COPY (LWIP_CHECKSUM_ON_COPY && CHECKSUM_GEN_TCP)
246 
247 /* This structure represents a TCP segment on the unsent, unacked and ooseq queues */
248 struct tcp_seg {
249  struct tcp_seg *next; /* used when putting segments on a queue */
250  struct pbuf *p; /* buffer containing data + TCP header */
251  u16_t len; /* the TCP length of this segment */
252 #if TCP_OVERSIZE_DBGCHECK
253  u16_t oversize_left; /* Extra bytes available at the end of the last
254  pbuf in unsent (used for asserting vs.
255  tcp_pcb.unsent_oversize only) */
256 #endif /* TCP_OVERSIZE_DBGCHECK */
257 #if TCP_CHECKSUM_ON_COPY
258  u16_t chksum;
259  u8_t chksum_swapped;
260 #endif /* TCP_CHECKSUM_ON_COPY */
261  u8_t flags;
262 #define TF_SEG_OPTS_MSS (u8_t)0x01U /* Include MSS option. */
263 #define TF_SEG_OPTS_TS (u8_t)0x02U /* Include timestamp option. */
264 #define TF_SEG_DATA_CHECKSUMMED (u8_t)0x04U /* ALL data (not the header) is
265  checksummed into 'chksum' */
266 #define TF_SEG_OPTS_WND_SCALE (u8_t)0x08U /* Include WND SCALE option */
267  struct tcp_hdr *tcphdr; /* the TCP header */
268 };
269 
270 #define LWIP_TCP_OPT_EOL 0
271 #define LWIP_TCP_OPT_NOP 1
272 #define LWIP_TCP_OPT_MSS 2
273 #define LWIP_TCP_OPT_WS 3
274 #define LWIP_TCP_OPT_TS 8
275 
276 #define LWIP_TCP_OPT_LEN_MSS 4
277 #if LWIP_TCP_TIMESTAMPS
278 #define LWIP_TCP_OPT_LEN_TS 10
279 #define LWIP_TCP_OPT_LEN_TS_OUT 12 /* aligned for output (includes NOP padding) */
280 #else
281 #define LWIP_TCP_OPT_LEN_TS_OUT 0
282 #endif
283 #if LWIP_WND_SCALE
284 #define LWIP_TCP_OPT_LEN_WS 3
285 #define LWIP_TCP_OPT_LEN_WS_OUT 4 /* aligned for output (includes NOP padding) */
286 #else
287 #define LWIP_TCP_OPT_LEN_WS_OUT 0
288 #endif
289 
290 #define LWIP_TCP_OPT_LENGTH(flags) \
291  (flags & TF_SEG_OPTS_MSS ? LWIP_TCP_OPT_LEN_MSS : 0) + \
292  (flags & TF_SEG_OPTS_TS ? LWIP_TCP_OPT_LEN_TS_OUT : 0) + \
293  (flags & TF_SEG_OPTS_WND_SCALE ? LWIP_TCP_OPT_LEN_WS_OUT : 0)
294 
295 /** This returns a TCP header option for MSS in an u32_t */
296 #define TCP_BUILD_MSS_OPTION(mss) lwip_htonl(0x02040000 | ((mss) & 0xFFFF))
297 
298 #if LWIP_WND_SCALE
299 #define TCPWNDSIZE_F U32_F
300 #define TCPWND_MAX 0xFFFFFFFFU
301 #define TCPWND_CHECK16(x) LWIP_ASSERT("window size > 0xFFFF", (x) <= 0xFFFF)
302 #define TCPWND_MIN16(x) ((u16_t)LWIP_MIN((x), 0xFFFF))
303 #else /* LWIP_WND_SCALE */
304 #define TCPWNDSIZE_F U16_F
305 #define TCPWND_MAX 0xFFFFU
306 #define TCPWND_CHECK16(x)
307 #define TCPWND_MIN16(x) x
308 #endif /* LWIP_WND_SCALE */
309 
310 /* Global variables: */
311 extern struct tcp_pcb *tcp_input_pcb;
312 extern u32_t tcp_ticks;
313 extern u8_t tcp_active_pcbs_changed;
314 
315 /* The TCP PCB lists. */
316 union tcp_listen_pcbs_t { /* List of all TCP PCBs in LISTEN state. */
317  struct tcp_pcb_listen *listen_pcbs;
318  struct tcp_pcb *pcbs;
319 };
320 extern struct tcp_pcb *tcp_bound_pcbs;
321 extern union tcp_listen_pcbs_t tcp_listen_pcbs;
322 extern struct tcp_pcb *tcp_active_pcbs; /* List of all TCP PCBs that are in a
323  state in which they accept or send
324  data. */
325 extern struct tcp_pcb *tcp_tw_pcbs; /* List of all TCP PCBs in TIME-WAIT. */
326 
327 #define NUM_TCP_PCB_LISTS_NO_TIME_WAIT 3
328 #define NUM_TCP_PCB_LISTS 4
329 extern struct tcp_pcb ** const tcp_pcb_lists[NUM_TCP_PCB_LISTS];
330 
331 /* Axioms about the above lists:
332  1) Every TCP PCB that is not CLOSED is in one of the lists.
333  2) A PCB is only in one of the lists.
334  3) All PCBs in the tcp_listen_pcbs list is in LISTEN state.
335  4) All PCBs in the tcp_tw_pcbs list is in TIME-WAIT state.
336 */
337 /* Define two macros, TCP_REG and TCP_RMV that registers a TCP PCB
338  with a PCB list or removes a PCB from a list, respectively. */
339 #ifndef TCP_DEBUG_PCB_LISTS
340 #define TCP_DEBUG_PCB_LISTS 0
341 #endif
342 #if TCP_DEBUG_PCB_LISTS
343 #define TCP_REG(pcbs, npcb) do {\
344  struct tcp_pcb *tcp_tmp_pcb; \
345  LWIP_DEBUGF(TCP_DEBUG, ("TCP_REG %p local port %d\n", (npcb), (npcb)->local_port)); \
346  for (tcp_tmp_pcb = *(pcbs); \
347  tcp_tmp_pcb != NULL; \
348  tcp_tmp_pcb = tcp_tmp_pcb->next) { \
349  LWIP_ASSERT("TCP_REG: already registered\n", tcp_tmp_pcb != (npcb)); \
350  } \
351  LWIP_ASSERT("TCP_REG: pcb->state != CLOSED", ((pcbs) == &tcp_bound_pcbs) || ((npcb)->state != CLOSED)); \
352  (npcb)->next = *(pcbs); \
353  LWIP_ASSERT("TCP_REG: npcb->next != npcb", (npcb)->next != (npcb)); \
354  *(pcbs) = (npcb); \
355  LWIP_ASSERT("TCP_RMV: tcp_pcbs sane", tcp_pcbs_sane()); \
356  tcp_timer_needed(); \
357  } while(0)
358 #define TCP_RMV(pcbs, npcb) do { \
359  struct tcp_pcb *tcp_tmp_pcb; \
360  LWIP_ASSERT("TCP_RMV: pcbs != NULL", *(pcbs) != NULL); \
361  LWIP_DEBUGF(TCP_DEBUG, ("TCP_RMV: removing %p from %p\n", (npcb), *(pcbs))); \
362  if(*(pcbs) == (npcb)) { \
363  *(pcbs) = (*pcbs)->next; \
364  } else for (tcp_tmp_pcb = *(pcbs); tcp_tmp_pcb != NULL; tcp_tmp_pcb = tcp_tmp_pcb->next) { \
365  if(tcp_tmp_pcb->next == (npcb)) { \
366  tcp_tmp_pcb->next = (npcb)->next; \
367  break; \
368  } \
369  } \
370  (npcb)->next = NULL; \
371  LWIP_ASSERT("TCP_RMV: tcp_pcbs sane", tcp_pcbs_sane()); \
372  LWIP_DEBUGF(TCP_DEBUG, ("TCP_RMV: removed %p from %p\n", (npcb), *(pcbs))); \
373  } while(0)
374 
375 #else /* LWIP_DEBUG */
376 
377 #define TCP_REG(pcbs, npcb) \
378  do { \
379  (npcb)->next = *pcbs; \
380  *(pcbs) = (npcb); \
381  tcp_timer_needed(); \
382  } while (0)
383 
384 #define TCP_RMV(pcbs, npcb) \
385  do { \
386  if(*(pcbs) == (npcb)) { \
387  (*(pcbs)) = (*pcbs)->next; \
388  } \
389  else { \
390  struct tcp_pcb *tcp_tmp_pcb; \
391  for (tcp_tmp_pcb = *pcbs; \
392  tcp_tmp_pcb != NULL; \
393  tcp_tmp_pcb = tcp_tmp_pcb->next) { \
394  if(tcp_tmp_pcb->next == (npcb)) { \
395  tcp_tmp_pcb->next = (npcb)->next; \
396  break; \
397  } \
398  } \
399  } \
400  (npcb)->next = NULL; \
401  } while(0)
402 
403 #endif /* LWIP_DEBUG */
404 
405 #define TCP_REG_ACTIVE(npcb) \
406  do { \
407  TCP_REG(&tcp_active_pcbs, npcb); \
408  tcp_active_pcbs_changed = 1; \
409  } while (0)
410 
411 #define TCP_RMV_ACTIVE(npcb) \
412  do { \
413  TCP_RMV(&tcp_active_pcbs, npcb); \
414  tcp_active_pcbs_changed = 1; \
415  } while (0)
416 
417 #define TCP_PCB_REMOVE_ACTIVE(pcb) \
418  do { \
419  tcp_pcb_remove(&tcp_active_pcbs, pcb); \
420  tcp_active_pcbs_changed = 1; \
421  } while (0)
422 
423 
424 /* Internal functions: */
425 struct tcp_pcb *tcp_pcb_copy(struct tcp_pcb *pcb);
426 void tcp_pcb_purge(struct tcp_pcb *pcb);
427 void tcp_pcb_remove(struct tcp_pcb **pcblist, struct tcp_pcb *pcb);
428 
429 void tcp_segs_free(struct tcp_seg *seg);
430 void tcp_seg_free(struct tcp_seg *seg);
431 struct tcp_seg *tcp_seg_copy(struct tcp_seg *seg);
432 
433 #define tcp_ack(pcb) \
434  do { \
435  if((pcb)->flags & TF_ACK_DELAY) { \
436  (pcb)->flags &= ~TF_ACK_DELAY; \
437  (pcb)->flags |= TF_ACK_NOW; \
438  } \
439  else { \
440  (pcb)->flags |= TF_ACK_DELAY; \
441  } \
442  } while (0)
443 
444 #define tcp_ack_now(pcb) \
445  do { \
446  (pcb)->flags |= TF_ACK_NOW; \
447  } while (0)
448 
449 err_t tcp_send_fin(struct tcp_pcb *pcb);
450 err_t tcp_enqueue_flags(struct tcp_pcb *pcb, u8_t flags);
451 
452 void tcp_rexmit_seg(struct tcp_pcb *pcb, struct tcp_seg *seg);
453 
454 void tcp_rst(u32_t seqno, u32_t ackno,
455  const ip_addr_t *local_ip, const ip_addr_t *remote_ip,
456  u16_t local_port, u16_t remote_port);
457 
458 u32_t tcp_next_iss(struct tcp_pcb *pcb);
459 
460 err_t tcp_keepalive(struct tcp_pcb *pcb);
461 err_t tcp_zero_window_probe(struct tcp_pcb *pcb);
462 void tcp_trigger_input_pcb_close(void);
463 
464 #if TCP_CALCULATE_EFF_SEND_MSS
465 u16_t tcp_eff_send_mss_impl(u16_t sendmss, const ip_addr_t *dest
466 #if LWIP_IPV6 || LWIP_IPV4_SRC_ROUTING
467  , const ip_addr_t *src
468 #endif /* LWIP_IPV6 || LWIP_IPV4_SRC_ROUTING */
469  );
470 #if LWIP_IPV6 || LWIP_IPV4_SRC_ROUTING
471 #define tcp_eff_send_mss(sendmss, src, dest) tcp_eff_send_mss_impl(sendmss, dest, src)
472 #else /* LWIP_IPV6 || LWIP_IPV4_SRC_ROUTING */
473 #define tcp_eff_send_mss(sendmss, src, dest) tcp_eff_send_mss_impl(sendmss, dest)
474 #endif /* LWIP_IPV6 || LWIP_IPV4_SRC_ROUTING */
475 #endif /* TCP_CALCULATE_EFF_SEND_MSS */
476 
477 #if LWIP_CALLBACK_API
478 err_t tcp_recv_null(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err);
479 #endif /* LWIP_CALLBACK_API */
480 
481 #if TCP_DEBUG || TCP_INPUT_DEBUG || TCP_OUTPUT_DEBUG
482 void tcp_debug_print(struct tcp_hdr *tcphdr);
483 void tcp_debug_print_flags(u8_t flags);
484 void tcp_debug_print_state(enum tcp_state s);
485 void tcp_debug_print_pcbs(void);
486 s16_t tcp_pcbs_sane(void);
487 #else
488 # define tcp_debug_print(tcphdr)
489 # define tcp_debug_print_flags(flags)
490 # define tcp_debug_print_state(s)
491 # define tcp_debug_print_pcbs()
492 # define tcp_pcbs_sane() 1
493 #endif /* TCP_DEBUG */
494 
495 /** External function (implemented in timers.c), called when TCP detects
496  * that a timer is needed (i.e. active- or time-wait-pcb found). */
497 void tcp_timer_needed(void);
498 
499 void tcp_netif_ip_addr_changed(const ip_addr_t* old_addr, const ip_addr_t* new_addr);
500 
501 #ifdef __cplusplus
502 }
503 #endif
504 
505 #endif /* LWIP_TCP */
506 
507 #endif /* LWIP_HDR_TCP_PRIV_H */
opt.h
pbuf::len
u16_t len
Definition: pbuf.h:159
s16_t
int16_t s16_t
Definition: arch.h:122
pbuf.h
u16_t
uint16_t u16_t
Definition: arch.h:121
LWIP_IPV6
#define LWIP_IPV6
Definition: opt.h:2153
tcp_timer_needed
void tcp_timer_needed(void)
Definition: timeouts.c:430
u32_t
uint32_t u32_t
Definition: arch.h:123
icmp.h
pbuf::flags
u8_t flags
Definition: pbuf.h:165
tcp.h
u8_t
uint8_t u8_t
Definition: arch.h:119
err.h
ip_addr_t
ip6_addr_t ip_addr_t
Definition: ip_addr.h:290
netif
Definition: netif.h:225
err_t
s8_t err_t
Definition: err.h:57
ip.h
tcp.h
ip6_addr.h
tcp_hdr
Definition: tcp.h:56
mem.h
pbuf
Definition: pbuf.h:142
ip6.h