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tcp_priv.h
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00001 /** 00002 * @file 00003 * TCP internal implementations (do not use in application code) 00004 */ 00005 00006 /* 00007 * Copyright (c) 2001-2004 Swedish Institute of Computer Science. 00008 * All rights reserved. 00009 * 00010 * Redistribution and use in source and binary forms, with or without modification, 00011 * are permitted provided that the following conditions are met: 00012 * 00013 * 1. Redistributions of source code must retain the above copyright notice, 00014 * this list of conditions and the following disclaimer. 00015 * 2. Redistributions in binary form must reproduce the above copyright notice, 00016 * this list of conditions and the following disclaimer in the documentation 00017 * and/or other materials provided with the distribution. 00018 * 3. The name of the author may not be used to endorse or promote products 00019 * derived from this software without specific prior written permission. 00020 * 00021 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 00022 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 00023 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT 00024 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 00025 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 00026 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 00027 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 00028 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 00029 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 00030 * OF SUCH DAMAGE. 00031 * 00032 * This file is part of the lwIP TCP/IP stack. 00033 * 00034 * Author: Adam Dunkels <adam@sics.se> 00035 * 00036 */ 00037 #ifndef LWIP_HDR_TCP_PRIV_H 00038 #define LWIP_HDR_TCP_PRIV_H 00039 00040 #include "lwip/opt.h" 00041 00042 #if LWIP_TCP /* don't build if not configured for use in lwipopts.h */ 00043 00044 #include "lwip/tcp.h" 00045 #include "lwip/mem.h" 00046 #include "lwip/pbuf.h" 00047 #include "lwip/ip.h" 00048 #include "lwip/icmp.h" 00049 #include "lwip/err.h" 00050 #include "lwip/ip6.h" 00051 #include "lwip/ip6_addr.h" 00052 #include "lwip/prot/tcp.h" 00053 00054 #ifdef __cplusplus 00055 extern "C" { 00056 #endif 00057 00058 /* Functions for interfacing with TCP: */ 00059 00060 /* Lower layer interface to TCP: */ 00061 void tcp_init (void); /* Initialize this module. */ 00062 void tcp_tmr (void); /* Must be called every 00063 TCP_TMR_INTERVAL 00064 ms. (Typically 250 ms). */ 00065 /* It is also possible to call these two functions at the right 00066 intervals (instead of calling tcp_tmr()). */ 00067 void tcp_slowtmr (void); 00068 void tcp_fasttmr (void); 00069 00070 /* Call this from a netif driver (watch out for threading issues!) that has 00071 returned a memory error on transmit and now has free buffers to send more. 00072 This iterates all active pcbs that had an error and tries to call 00073 tcp_output, so use this with care as it might slow down the system. */ 00074 void tcp_txnow (void); 00075 00076 /* Only used by IP to pass a TCP segment to TCP: */ 00077 void tcp_input (struct pbuf *p, struct netif *inp); 00078 /* Used within the TCP code only: */ 00079 struct tcp_pcb * tcp_alloc (u8_t prio); 00080 void tcp_abandon (struct tcp_pcb *pcb, int reset); 00081 err_t tcp_send_empty_ack(struct tcp_pcb *pcb); 00082 void tcp_rexmit (struct tcp_pcb *pcb); 00083 void tcp_rexmit_rto (struct tcp_pcb *pcb); 00084 void tcp_rexmit_fast (struct tcp_pcb *pcb); 00085 u32_t tcp_update_rcv_ann_wnd(struct tcp_pcb *pcb); 00086 err_t tcp_process_refused_data(struct tcp_pcb *pcb); 00087 00088 /** 00089 * This is the Nagle algorithm: try to combine user data to send as few TCP 00090 * segments as possible. Only send if 00091 * - no previously transmitted data on the connection remains unacknowledged or 00092 * - the TF_NODELAY flag is set (nagle algorithm turned off for this pcb) or 00093 * - the only unsent segment is at least pcb->mss bytes long (or there is more 00094 * than one unsent segment - with lwIP, this can happen although unsent->len < mss) 00095 * - or if we are in fast-retransmit (TF_INFR) 00096 */ 00097 #define tcp_do_output_nagle(tpcb) ((((tpcb)->unacked == NULL) || \ 00098 ((tpcb)->flags & (TF_NODELAY | TF_INFR)) || \ 00099 (((tpcb)->unsent != NULL) && (((tpcb)->unsent->next != NULL) || \ 00100 ((tpcb)->unsent->len >= (tpcb)->mss))) || \ 00101 ((tcp_sndbuf(tpcb) == 0) || (tcp_sndqueuelen(tpcb) >= TCP_SND_QUEUELEN)) \ 00102 ) ? 1 : 0) 00103 #define tcp_output_nagle(tpcb) (tcp_do_output_nagle(tpcb) ? tcp_output(tpcb) : ERR_OK) 00104 00105 00106 #define TCP_SEQ_LT(a,b) ((s32_t)((u32_t)(a) - (u32_t)(b)) < 0) 00107 #define TCP_SEQ_LEQ(a,b) ((s32_t)((u32_t)(a) - (u32_t)(b)) <= 0) 00108 #define TCP_SEQ_GT(a,b) ((s32_t)((u32_t)(a) - (u32_t)(b)) > 0) 00109 #define TCP_SEQ_GEQ(a,b) ((s32_t)((u32_t)(a) - (u32_t)(b)) >= 0) 00110 /* is b<=a<=c? */ 00111 #if 0 /* see bug #10548 */ 00112 #define TCP_SEQ_BETWEEN(a,b,c) ((c)-(b) >= (a)-(b)) 00113 #endif 00114 #define TCP_SEQ_BETWEEN(a,b,c) (TCP_SEQ_GEQ(a,b) && TCP_SEQ_LEQ(a,c)) 00115 00116 #ifndef TCP_TMR_INTERVAL 00117 #define TCP_TMR_INTERVAL 250 /* The TCP timer interval in milliseconds. */ 00118 #endif /* TCP_TMR_INTERVAL */ 00119 00120 #ifndef TCP_FAST_INTERVAL 00121 #define TCP_FAST_INTERVAL TCP_TMR_INTERVAL /* the fine grained timeout in milliseconds */ 00122 #endif /* TCP_FAST_INTERVAL */ 00123 00124 #ifndef TCP_SLOW_INTERVAL 00125 #define TCP_SLOW_INTERVAL (2*TCP_TMR_INTERVAL) /* the coarse grained timeout in milliseconds */ 00126 #endif /* TCP_SLOW_INTERVAL */ 00127 00128 #define TCP_FIN_WAIT_TIMEOUT 20000 /* milliseconds */ 00129 #define TCP_SYN_RCVD_TIMEOUT 20000 /* milliseconds */ 00130 00131 #define TCP_OOSEQ_TIMEOUT 6U /* x RTO */ 00132 00133 #ifndef TCP_MSL 00134 #define TCP_MSL 60000UL /* The maximum segment lifetime in milliseconds */ 00135 #endif 00136 00137 /* Keepalive values, compliant with RFC 1122. Don't change this unless you know what you're doing */ 00138 #ifndef TCP_KEEPIDLE_DEFAULT 00139 #define TCP_KEEPIDLE_DEFAULT 7200000UL /* Default KEEPALIVE timer in milliseconds */ 00140 #endif 00141 00142 #ifndef TCP_KEEPINTVL_DEFAULT 00143 #define TCP_KEEPINTVL_DEFAULT 75000UL /* Default Time between KEEPALIVE probes in milliseconds */ 00144 #endif 00145 00146 #ifndef TCP_KEEPCNT_DEFAULT 00147 #define TCP_KEEPCNT_DEFAULT 9U /* Default Counter for KEEPALIVE probes */ 00148 #endif 00149 00150 #define TCP_MAXIDLE TCP_KEEPCNT_DEFAULT * TCP_KEEPINTVL_DEFAULT /* Maximum KEEPALIVE probe time */ 00151 00152 #define TCP_TCPLEN(seg) ((seg)->len + (((TCPH_FLAGS((seg)->tcphdr) & (TCP_FIN | TCP_SYN)) != 0) ? 1U : 0U)) 00153 00154 /** Flags used on input processing, not on pcb->flags 00155 */ 00156 #define TF_RESET (u8_t)0x08U /* Connection was reset. */ 00157 #define TF_CLOSED (u8_t)0x10U /* Connection was successfully closed. */ 00158 #define TF_GOT_FIN (u8_t)0x20U /* Connection was closed by the remote end. */ 00159 00160 00161 #if LWIP_EVENT_API 00162 00163 #define TCP_EVENT_ACCEPT(lpcb,pcb,arg,err,ret) ret = lwip_tcp_event(arg, (pcb),\ 00164 LWIP_EVENT_ACCEPT, NULL, 0, err) 00165 #define TCP_EVENT_SENT(pcb,space,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\ 00166 LWIP_EVENT_SENT, NULL, space, ERR_OK) 00167 #define TCP_EVENT_RECV(pcb,p,err,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\ 00168 LWIP_EVENT_RECV, (p), 0, (err)) 00169 #define TCP_EVENT_CLOSED(pcb,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\ 00170 LWIP_EVENT_RECV, NULL, 0, ERR_OK) 00171 #define TCP_EVENT_CONNECTED(pcb,err,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\ 00172 LWIP_EVENT_CONNECTED, NULL, 0, (err)) 00173 #define TCP_EVENT_POLL(pcb,ret) do { if ((pcb)->state != SYN_RCVD) { \ 00174 ret = lwip_tcp_event((pcb)->callback_arg, (pcb), LWIP_EVENT_POLL, NULL, 0, ERR_OK); \ 00175 } else { \ 00176 ret = ERR_ARG; } } while(0) 00177 #define TCP_EVENT_ERR(last_state,errf,arg,err) do { if (last_state != SYN_RCVD) { \ 00178 lwip_tcp_event((arg), NULL, LWIP_EVENT_ERR, NULL, 0, (err)); } } while(0) 00179 00180 #else /* LWIP_EVENT_API */ 00181 00182 #define TCP_EVENT_ACCEPT(lpcb,pcb,arg,err,ret) \ 00183 do { \ 00184 if((lpcb)->accept != NULL) \ 00185 (ret) = (lpcb)->accept((arg),(pcb),(err)); \ 00186 else (ret) = ERR_ARG; \ 00187 } while (0) 00188 00189 #define TCP_EVENT_SENT(pcb,space,ret) \ 00190 do { \ 00191 if((pcb)->sent != NULL) \ 00192 (ret) = (pcb)->sent((pcb)->callback_arg,(pcb),(space)); \ 00193 else (ret) = ERR_OK; \ 00194 } while (0) 00195 00196 #define TCP_EVENT_RECV(pcb,p,err,ret) \ 00197 do { \ 00198 if((pcb)->recv != NULL) { \ 00199 (ret) = (pcb)->recv((pcb)->callback_arg,(pcb),(p),(err));\ 00200 } else { \ 00201 (ret) = tcp_recv_null(NULL, (pcb), (p), (err)); \ 00202 } \ 00203 } while (0) 00204 00205 #define TCP_EVENT_CLOSED(pcb,ret) \ 00206 do { \ 00207 if(((pcb)->recv != NULL)) { \ 00208 (ret) = (pcb)->recv((pcb)->callback_arg,(pcb),NULL,ERR_OK);\ 00209 } else { \ 00210 (ret) = ERR_OK; \ 00211 } \ 00212 } while (0) 00213 00214 #define TCP_EVENT_CONNECTED(pcb,err,ret) \ 00215 do { \ 00216 if((pcb)->connected != NULL) \ 00217 (ret) = (pcb)->connected((pcb)->callback_arg,(pcb),(err)); \ 00218 else (ret) = ERR_OK; \ 00219 } while (0) 00220 00221 #define TCP_EVENT_POLL(pcb,ret) \ 00222 do { \ 00223 if((pcb)->poll != NULL) \ 00224 (ret) = (pcb)->poll((pcb)->callback_arg,(pcb)); \ 00225 else (ret) = ERR_OK; \ 00226 } while (0) 00227 00228 #define TCP_EVENT_ERR(last_state,errf,arg,err) \ 00229 do { \ 00230 LWIP_UNUSED_ARG(last_state); \ 00231 if((errf) != NULL) \ 00232 (errf)((arg),(err)); \ 00233 } while (0) 00234 00235 #endif /* LWIP_EVENT_API */ 00236 00237 /** Enabled extra-check for TCP_OVERSIZE if LWIP_DEBUG is enabled */ 00238 #if TCP_OVERSIZE && defined(LWIP_DEBUG) 00239 #define TCP_OVERSIZE_DBGCHECK 1 00240 #else 00241 #define TCP_OVERSIZE_DBGCHECK 0 00242 #endif 00243 00244 /** Don't generate checksum on copy if CHECKSUM_GEN_TCP is disabled */ 00245 #define TCP_CHECKSUM_ON_COPY (LWIP_CHECKSUM_ON_COPY && CHECKSUM_GEN_TCP) 00246 00247 /* This structure represents a TCP segment on the unsent, unacked and ooseq queues */ 00248 struct tcp_seg { 00249 struct tcp_seg *next; /* used when putting segments on a queue */ 00250 struct pbuf *p; /* buffer containing data + TCP header */ 00251 u16_t len; /* the TCP length of this segment */ 00252 #if TCP_OVERSIZE_DBGCHECK 00253 u16_t oversize_left; /* Extra bytes available at the end of the last 00254 pbuf in unsent (used for asserting vs. 00255 tcp_pcb.unsent_oversize only) */ 00256 #endif /* TCP_OVERSIZE_DBGCHECK */ 00257 #if TCP_CHECKSUM_ON_COPY 00258 u16_t chksum; 00259 u8_t chksum_swapped; 00260 #endif /* TCP_CHECKSUM_ON_COPY */ 00261 u8_t flags; 00262 #define TF_SEG_OPTS_MSS (u8_t)0x01U /* Include MSS option. */ 00263 #define TF_SEG_OPTS_TS (u8_t)0x02U /* Include timestamp option. */ 00264 #define TF_SEG_DATA_CHECKSUMMED (u8_t)0x04U /* ALL data (not the header) is 00265 checksummed into 'chksum' */ 00266 #define TF_SEG_OPTS_WND_SCALE (u8_t)0x08U /* Include WND SCALE option */ 00267 struct tcp_hdr *tcphdr; /* the TCP header */ 00268 }; 00269 00270 #define LWIP_TCP_OPT_EOL 0 00271 #define LWIP_TCP_OPT_NOP 1 00272 #define LWIP_TCP_OPT_MSS 2 00273 #define LWIP_TCP_OPT_WS 3 00274 #define LWIP_TCP_OPT_TS 8 00275 00276 #define LWIP_TCP_OPT_LEN_MSS 4 00277 #if LWIP_TCP_TIMESTAMPS 00278 #define LWIP_TCP_OPT_LEN_TS 10 00279 #define LWIP_TCP_OPT_LEN_TS_OUT 12 /* aligned for output (includes NOP padding) */ 00280 #else 00281 #define LWIP_TCP_OPT_LEN_TS_OUT 0 00282 #endif 00283 #if LWIP_WND_SCALE 00284 #define LWIP_TCP_OPT_LEN_WS 3 00285 #define LWIP_TCP_OPT_LEN_WS_OUT 4 /* aligned for output (includes NOP padding) */ 00286 #else 00287 #define LWIP_TCP_OPT_LEN_WS_OUT 0 00288 #endif 00289 00290 #define LWIP_TCP_OPT_LENGTH(flags) \ 00291 (flags & TF_SEG_OPTS_MSS ? LWIP_TCP_OPT_LEN_MSS : 0) + \ 00292 (flags & TF_SEG_OPTS_TS ? LWIP_TCP_OPT_LEN_TS_OUT : 0) + \ 00293 (flags & TF_SEG_OPTS_WND_SCALE ? LWIP_TCP_OPT_LEN_WS_OUT : 0) 00294 00295 /** This returns a TCP header option for MSS in an u32_t */ 00296 #define TCP_BUILD_MSS_OPTION(mss) lwip_htonl(0x02040000 | ((mss) & 0xFFFF)) 00297 00298 #if LWIP_WND_SCALE 00299 #define TCPWNDSIZE_F U32_F 00300 #define TCPWND_MAX 0xFFFFFFFFU 00301 #define TCPWND_CHECK16(x) LWIP_ASSERT("window size > 0xFFFF", (x) <= 0xFFFF) 00302 #define TCPWND_MIN16(x) ((u16_t)LWIP_MIN((x), 0xFFFF)) 00303 #else /* LWIP_WND_SCALE */ 00304 #define TCPWNDSIZE_F U16_F 00305 #define TCPWND_MAX 0xFFFFU 00306 #define TCPWND_CHECK16(x) 00307 #define TCPWND_MIN16(x) x 00308 #endif /* LWIP_WND_SCALE */ 00309 00310 /* Global variables: */ 00311 extern struct tcp_pcb *tcp_input_pcb; 00312 extern u32_t tcp_ticks; 00313 extern u8_t tcp_active_pcbs_changed; 00314 00315 /* The TCP PCB lists. */ 00316 union tcp_listen_pcbs_t { /* List of all TCP PCBs in LISTEN state. */ 00317 struct tcp_pcb_listen *listen_pcbs; 00318 struct tcp_pcb *pcbs; 00319 }; 00320 extern struct tcp_pcb *tcp_bound_pcbs; 00321 extern union tcp_listen_pcbs_t tcp_listen_pcbs; 00322 extern struct tcp_pcb *tcp_active_pcbs; /* List of all TCP PCBs that are in a 00323 state in which they accept or send 00324 data. */ 00325 extern struct tcp_pcb *tcp_tw_pcbs; /* List of all TCP PCBs in TIME-WAIT. */ 00326 00327 #define NUM_TCP_PCB_LISTS_NO_TIME_WAIT 3 00328 #define NUM_TCP_PCB_LISTS 4 00329 extern struct tcp_pcb ** const tcp_pcb_lists[NUM_TCP_PCB_LISTS]; 00330 00331 /* Axioms about the above lists: 00332 1) Every TCP PCB that is not CLOSED is in one of the lists. 00333 2) A PCB is only in one of the lists. 00334 3) All PCBs in the tcp_listen_pcbs list is in LISTEN state. 00335 4) All PCBs in the tcp_tw_pcbs list is in TIME-WAIT state. 00336 */ 00337 /* Define two macros, TCP_REG and TCP_RMV that registers a TCP PCB 00338 with a PCB list or removes a PCB from a list, respectively. */ 00339 #ifndef TCP_DEBUG_PCB_LISTS 00340 #define TCP_DEBUG_PCB_LISTS 0 00341 #endif 00342 #if TCP_DEBUG_PCB_LISTS 00343 #define TCP_REG(pcbs, npcb) do {\ 00344 struct tcp_pcb *tcp_tmp_pcb; \ 00345 LWIP_DEBUGF(TCP_DEBUG, ("TCP_REG %p local port %d\n", (npcb), (npcb)->local_port)); \ 00346 for (tcp_tmp_pcb = *(pcbs); \ 00347 tcp_tmp_pcb != NULL; \ 00348 tcp_tmp_pcb = tcp_tmp_pcb->next) { \ 00349 LWIP_ASSERT("TCP_REG: already registered\n", tcp_tmp_pcb != (npcb)); \ 00350 } \ 00351 LWIP_ASSERT("TCP_REG: pcb->state != CLOSED", ((pcbs) == &tcp_bound_pcbs) || ((npcb)->state != CLOSED)); \ 00352 (npcb)->next = *(pcbs); \ 00353 LWIP_ASSERT("TCP_REG: npcb->next != npcb", (npcb)->next != (npcb)); \ 00354 *(pcbs) = (npcb); \ 00355 LWIP_ASSERT("TCP_RMV: tcp_pcbs sane", tcp_pcbs_sane()); \ 00356 tcp_timer_needed(); \ 00357 } while(0) 00358 #define TCP_RMV(pcbs, npcb) do { \ 00359 struct tcp_pcb *tcp_tmp_pcb; \ 00360 LWIP_ASSERT("TCP_RMV: pcbs != NULL", *(pcbs) != NULL); \ 00361 LWIP_DEBUGF(TCP_DEBUG, ("TCP_RMV: removing %p from %p\n", (npcb), *(pcbs))); \ 00362 if(*(pcbs) == (npcb)) { \ 00363 *(pcbs) = (*pcbs)->next; \ 00364 } else for (tcp_tmp_pcb = *(pcbs); tcp_tmp_pcb != NULL; tcp_tmp_pcb = tcp_tmp_pcb->next) { \ 00365 if(tcp_tmp_pcb->next == (npcb)) { \ 00366 tcp_tmp_pcb->next = (npcb)->next; \ 00367 break; \ 00368 } \ 00369 } \ 00370 (npcb)->next = NULL; \ 00371 LWIP_ASSERT("TCP_RMV: tcp_pcbs sane", tcp_pcbs_sane()); \ 00372 LWIP_DEBUGF(TCP_DEBUG, ("TCP_RMV: removed %p from %p\n", (npcb), *(pcbs))); \ 00373 } while(0) 00374 00375 #else /* LWIP_DEBUG */ 00376 00377 #define TCP_REG(pcbs, npcb) \ 00378 do { \ 00379 (npcb)->next = *pcbs; \ 00380 *(pcbs) = (npcb); \ 00381 tcp_timer_needed(); \ 00382 } while (0) 00383 00384 #define TCP_RMV(pcbs, npcb) \ 00385 do { \ 00386 if(*(pcbs) == (npcb)) { \ 00387 (*(pcbs)) = (*pcbs)->next; \ 00388 } \ 00389 else { \ 00390 struct tcp_pcb *tcp_tmp_pcb; \ 00391 for (tcp_tmp_pcb = *pcbs; \ 00392 tcp_tmp_pcb != NULL; \ 00393 tcp_tmp_pcb = tcp_tmp_pcb->next) { \ 00394 if(tcp_tmp_pcb->next == (npcb)) { \ 00395 tcp_tmp_pcb->next = (npcb)->next; \ 00396 break; \ 00397 } \ 00398 } \ 00399 } \ 00400 (npcb)->next = NULL; \ 00401 } while(0) 00402 00403 #endif /* LWIP_DEBUG */ 00404 00405 #define TCP_REG_ACTIVE(npcb) \ 00406 do { \ 00407 TCP_REG(&tcp_active_pcbs, npcb); \ 00408 tcp_active_pcbs_changed = 1; \ 00409 } while (0) 00410 00411 #define TCP_RMV_ACTIVE(npcb) \ 00412 do { \ 00413 TCP_RMV(&tcp_active_pcbs, npcb); \ 00414 tcp_active_pcbs_changed = 1; \ 00415 } while (0) 00416 00417 #define TCP_PCB_REMOVE_ACTIVE(pcb) \ 00418 do { \ 00419 tcp_pcb_remove(&tcp_active_pcbs, pcb); \ 00420 tcp_active_pcbs_changed = 1; \ 00421 } while (0) 00422 00423 00424 /* Internal functions: */ 00425 struct tcp_pcb *tcp_pcb_copy(struct tcp_pcb *pcb); 00426 void tcp_pcb_purge(struct tcp_pcb *pcb); 00427 void tcp_pcb_remove(struct tcp_pcb **pcblist, struct tcp_pcb *pcb); 00428 00429 void tcp_segs_free(struct tcp_seg *seg); 00430 void tcp_seg_free(struct tcp_seg *seg); 00431 struct tcp_seg *tcp_seg_copy(struct tcp_seg *seg); 00432 00433 #define tcp_ack(pcb) \ 00434 do { \ 00435 if((pcb)->flags & TF_ACK_DELAY) { \ 00436 (pcb)->flags &= ~TF_ACK_DELAY; \ 00437 (pcb)->flags |= TF_ACK_NOW; \ 00438 } \ 00439 else { \ 00440 (pcb)->flags |= TF_ACK_DELAY; \ 00441 } \ 00442 } while (0) 00443 00444 #define tcp_ack_now(pcb) \ 00445 do { \ 00446 (pcb)->flags |= TF_ACK_NOW; \ 00447 } while (0) 00448 00449 err_t tcp_send_fin(struct tcp_pcb *pcb); 00450 err_t tcp_enqueue_flags(struct tcp_pcb *pcb, u8_t flags); 00451 00452 void tcp_rexmit_seg(struct tcp_pcb *pcb, struct tcp_seg *seg); 00453 00454 void tcp_rst(u32_t seqno, u32_t ackno, 00455 const ip_addr_t *local_ip, const ip_addr_t *remote_ip, 00456 u16_t local_port, u16_t remote_port); 00457 00458 u32_t tcp_next_iss(struct tcp_pcb *pcb); 00459 00460 err_t tcp_keepalive(struct tcp_pcb *pcb); 00461 err_t tcp_zero_window_probe(struct tcp_pcb *pcb); 00462 void tcp_trigger_input_pcb_close(void); 00463 00464 #if TCP_CALCULATE_EFF_SEND_MSS 00465 u16_t tcp_eff_send_mss_impl(u16_t sendmss, const ip_addr_t *dest 00466 #if LWIP_IPV6 || LWIP_IPV4_SRC_ROUTING 00467 , const ip_addr_t *src 00468 #endif /* LWIP_IPV6 || LWIP_IPV4_SRC_ROUTING */ 00469 ); 00470 #if LWIP_IPV6 || LWIP_IPV4_SRC_ROUTING 00471 #define tcp_eff_send_mss(sendmss, src, dest) tcp_eff_send_mss_impl(sendmss, dest, src) 00472 #else /* LWIP_IPV6 || LWIP_IPV4_SRC_ROUTING */ 00473 #define tcp_eff_send_mss(sendmss, src, dest) tcp_eff_send_mss_impl(sendmss, dest) 00474 #endif /* LWIP_IPV6 || LWIP_IPV4_SRC_ROUTING */ 00475 #endif /* TCP_CALCULATE_EFF_SEND_MSS */ 00476 00477 #if LWIP_CALLBACK_API 00478 err_t tcp_recv_null(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err); 00479 #endif /* LWIP_CALLBACK_API */ 00480 00481 #if TCP_DEBUG || TCP_INPUT_DEBUG || TCP_OUTPUT_DEBUG 00482 void tcp_debug_print(struct tcp_hdr *tcphdr); 00483 void tcp_debug_print_flags(u8_t flags); 00484 void tcp_debug_print_state(enum tcp_state s); 00485 void tcp_debug_print_pcbs(void); 00486 s16_t tcp_pcbs_sane(void); 00487 #else 00488 # define tcp_debug_print(tcphdr) 00489 # define tcp_debug_print_flags(flags) 00490 # define tcp_debug_print_state(s) 00491 # define tcp_debug_print_pcbs() 00492 # define tcp_pcbs_sane() 1 00493 #endif /* TCP_DEBUG */ 00494 00495 /** External function (implemented in timers.c), called when TCP detects 00496 * that a timer is needed (i.e. active- or time-wait-pcb found). */ 00497 void tcp_timer_needed(void); 00498 00499 void tcp_netif_ip_addr_changed(const ip_addr_t* old_addr, const ip_addr_t* new_addr); 00500 00501 #ifdef __cplusplus 00502 } 00503 #endif 00504 00505 #endif /* LWIP_TCP */ 00506 00507 #endif /* LWIP_HDR_TCP_PRIV_H */
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