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[/] [openrisc/] [trunk/] [rtos/] [ecos-3.0/] [packages/] [net/] [lwip_tcpip/] [current/] [include/] [lwip/] [tcp.h] - Rev 856
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/* * Copyright (c) 2001-2004 Swedish Institute of Computer Science. * All rights reserved. * * Redistribution and use in source and binary forms, with or without modification, * are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY * OF SUCH DAMAGE. * * This file is part of the lwIP TCP/IP stack. * * Author: Adam Dunkels <adam@sics.se> * */ #ifndef __LWIP_TCP_H__ #define __LWIP_TCP_H__ #include "lwip/opt.h" #if LWIP_TCP /* don't build if not configured for use in lwipopts.h */ #include "lwip/sys.h" #include "lwip/mem.h" #include "lwip/pbuf.h" #include "lwip/ip.h" #include "lwip/icmp.h" #include "lwip/err.h" #ifdef __cplusplus extern "C" { #endif struct tcp_pcb; /* Functions for interfacing with TCP: */ /* Lower layer interface to TCP: */ #define tcp_init() /* Compatibility define, not init needed. */ void tcp_tmr (void); /* Must be called every TCP_TMR_INTERVAL ms. (Typically 250 ms). */ /* Application program's interface: */ struct tcp_pcb * tcp_new (void); struct tcp_pcb * tcp_alloc (u8_t prio); void tcp_arg (struct tcp_pcb *pcb, void *arg); void tcp_accept (struct tcp_pcb *pcb, err_t (* accept)(void *arg, struct tcp_pcb *newpcb, err_t err)); void tcp_recv (struct tcp_pcb *pcb, err_t (* recv)(void *arg, struct tcp_pcb *tpcb, struct pbuf *p, err_t err)); void tcp_sent (struct tcp_pcb *pcb, err_t (* sent)(void *arg, struct tcp_pcb *tpcb, u16_t len)); void tcp_poll (struct tcp_pcb *pcb, err_t (* poll)(void *arg, struct tcp_pcb *tpcb), u8_t interval); void tcp_err (struct tcp_pcb *pcb, void (* err)(void *arg, err_t err)); #define tcp_mss(pcb) ((pcb)->mss) #define tcp_sndbuf(pcb) ((pcb)->snd_buf) #define tcp_nagle_disable(pcb) ((pcb)->flags |= TF_NODELAY) #define tcp_nagle_enable(pcb) ((pcb)->flags &= ~TF_NODELAY) #define tcp_nagle_disabled(pcb) (((pcb)->flags & TF_NODELAY) != 0) #if TCP_LISTEN_BACKLOG #define tcp_accepted(pcb) (((struct tcp_pcb_listen *)(pcb))->accepts_pending--) #else /* TCP_LISTEN_BACKLOG */ #define tcp_accepted(pcb) #endif /* TCP_LISTEN_BACKLOG */ void tcp_recved (struct tcp_pcb *pcb, u16_t len); err_t tcp_bind (struct tcp_pcb *pcb, struct ip_addr *ipaddr, u16_t port); err_t tcp_connect (struct tcp_pcb *pcb, struct ip_addr *ipaddr, u16_t port, err_t (* connected)(void *arg, struct tcp_pcb *tpcb, err_t err)); struct tcp_pcb * tcp_listen_with_backlog(struct tcp_pcb *pcb, u8_t backlog); #define tcp_listen(pcb) tcp_listen_with_backlog(pcb, TCP_DEFAULT_LISTEN_BACKLOG) void tcp_abandon (struct tcp_pcb *pcb, int reset); #define tcp_abort(pcb) tcp_abandon((pcb), 1) err_t tcp_close (struct tcp_pcb *pcb); /* Flags for "apiflags" parameter in tcp_write and tcp_enqueue */ #define TCP_WRITE_FLAG_COPY 0x01 #define TCP_WRITE_FLAG_MORE 0x02 err_t tcp_write (struct tcp_pcb *pcb, const void *dataptr, u16_t len, u8_t apiflags); void tcp_setprio (struct tcp_pcb *pcb, u8_t prio); #define TCP_PRIO_MIN 1 #define TCP_PRIO_NORMAL 64 #define TCP_PRIO_MAX 127 /* It is also possible to call these two functions at the right intervals (instead of calling tcp_tmr()). */ void tcp_slowtmr (void); void tcp_fasttmr (void); /* Only used by IP to pass a TCP segment to TCP: */ void tcp_input (struct pbuf *p, struct netif *inp); /* Used within the TCP code only: */ err_t tcp_send_empty_ack(struct tcp_pcb *pcb); err_t tcp_output (struct tcp_pcb *pcb); void tcp_rexmit (struct tcp_pcb *pcb); void tcp_rexmit_rto (struct tcp_pcb *pcb); void tcp_rexmit_fast (struct tcp_pcb *pcb); u32_t tcp_update_rcv_ann_wnd(struct tcp_pcb *pcb); /** * This is the Nagle algorithm: try to combine user data to send as few TCP * segments as possible. Only send if * - no previously transmitted data on the connection remains unacknowledged or * - the TF_NODELAY flag is set (nagle algorithm turned off for this pcb) or * - the only unsent segment is at least pcb->mss bytes long (or there is more * than one unsent segment - with lwIP, this can happen although unsent->len < mss) * - or if we are in fast-retransmit (TF_INFR) */ #define tcp_do_output_nagle(tpcb) ((((tpcb)->unacked == NULL) || \ ((tpcb)->flags & (TF_NODELAY | TF_INFR)) || \ (((tpcb)->unsent != NULL) && (((tpcb)->unsent->next != NULL) || \ ((tpcb)->unsent->len >= (tpcb)->mss))) \ ) ? 1 : 0) #define tcp_output_nagle(tpcb) (tcp_do_output_nagle(tpcb) ? tcp_output(tpcb) : ERR_OK) #define TCP_SEQ_LT(a,b) ((s32_t)((a)-(b)) < 0) #define TCP_SEQ_LEQ(a,b) ((s32_t)((a)-(b)) <= 0) #define TCP_SEQ_GT(a,b) ((s32_t)((a)-(b)) > 0) #define TCP_SEQ_GEQ(a,b) ((s32_t)((a)-(b)) >= 0) /* is b<=a<=c? */ #if 0 /* see bug #10548 */ #define TCP_SEQ_BETWEEN(a,b,c) ((c)-(b) >= (a)-(b)) #endif #define TCP_SEQ_BETWEEN(a,b,c) (TCP_SEQ_GEQ(a,b) && TCP_SEQ_LEQ(a,c)) #define TCP_FIN 0x01U #define TCP_SYN 0x02U #define TCP_RST 0x04U #define TCP_PSH 0x08U #define TCP_ACK 0x10U #define TCP_URG 0x20U #define TCP_ECE 0x40U #define TCP_CWR 0x80U #define TCP_FLAGS 0x3fU /* Length of the TCP header, excluding options. */ #define TCP_HLEN 20 #ifndef TCP_TMR_INTERVAL #define TCP_TMR_INTERVAL 250 /* The TCP timer interval in milliseconds. */ #endif /* TCP_TMR_INTERVAL */ #ifndef TCP_FAST_INTERVAL #define TCP_FAST_INTERVAL TCP_TMR_INTERVAL /* the fine grained timeout in milliseconds */ #endif /* TCP_FAST_INTERVAL */ #ifndef TCP_SLOW_INTERVAL #define TCP_SLOW_INTERVAL (2*TCP_TMR_INTERVAL) /* the coarse grained timeout in milliseconds */ #endif /* TCP_SLOW_INTERVAL */ #define TCP_FIN_WAIT_TIMEOUT 20000 /* milliseconds */ #define TCP_SYN_RCVD_TIMEOUT 20000 /* milliseconds */ #define TCP_OOSEQ_TIMEOUT 6U /* x RTO */ #ifndef TCP_MSL #define TCP_MSL 60000UL /* The maximum segment lifetime in milliseconds */ #endif /* Keepalive values, compliant with RFC 1122. Don't change this unless you know what you're doing */ #ifndef TCP_KEEPIDLE_DEFAULT #define TCP_KEEPIDLE_DEFAULT 7200000UL /* Default KEEPALIVE timer in milliseconds */ #endif #ifndef TCP_KEEPINTVL_DEFAULT #define TCP_KEEPINTVL_DEFAULT 75000UL /* Default Time between KEEPALIVE probes in milliseconds */ #endif #ifndef TCP_KEEPCNT_DEFAULT #define TCP_KEEPCNT_DEFAULT 9U /* Default Counter for KEEPALIVE probes */ #endif #define TCP_MAXIDLE TCP_KEEPCNT_DEFAULT * TCP_KEEPINTVL_DEFAULT /* Maximum KEEPALIVE probe time */ /* Fields are (of course) in network byte order. * Some fields are converted to host byte order in tcp_input(). */ #ifdef PACK_STRUCT_USE_INCLUDES # include "arch/bpstruct.h" #endif PACK_STRUCT_BEGIN struct tcp_hdr { PACK_STRUCT_FIELD(u16_t src); PACK_STRUCT_FIELD(u16_t dest); PACK_STRUCT_FIELD(u32_t seqno); PACK_STRUCT_FIELD(u32_t ackno); PACK_STRUCT_FIELD(u16_t _hdrlen_rsvd_flags); PACK_STRUCT_FIELD(u16_t wnd); PACK_STRUCT_FIELD(u16_t chksum); PACK_STRUCT_FIELD(u16_t urgp); } PACK_STRUCT_STRUCT; PACK_STRUCT_END #ifdef PACK_STRUCT_USE_INCLUDES # include "arch/epstruct.h" #endif #define TCPH_OFFSET(phdr) (ntohs((phdr)->_hdrlen_rsvd_flags) >> 8) #define TCPH_HDRLEN(phdr) (ntohs((phdr)->_hdrlen_rsvd_flags) >> 12) #define TCPH_FLAGS(phdr) (ntohs((phdr)->_hdrlen_rsvd_flags) & TCP_FLAGS) #define TCPH_OFFSET_SET(phdr, offset) (phdr)->_hdrlen_rsvd_flags = htons(((offset) << 8) | TCPH_FLAGS(phdr)) #define TCPH_HDRLEN_SET(phdr, len) (phdr)->_hdrlen_rsvd_flags = htons(((len) << 12) | TCPH_FLAGS(phdr)) #define TCPH_FLAGS_SET(phdr, flags) (phdr)->_hdrlen_rsvd_flags = (((phdr)->_hdrlen_rsvd_flags & htons((u16_t)(~(u16_t)(TCP_FLAGS)))) | htons(flags)) #define TCPH_SET_FLAG(phdr, flags ) (phdr)->_hdrlen_rsvd_flags = ((phdr)->_hdrlen_rsvd_flags | htons(flags)) #define TCPH_UNSET_FLAG(phdr, flags) (phdr)->_hdrlen_rsvd_flags = htons(ntohs((phdr)->_hdrlen_rsvd_flags) | (TCPH_FLAGS(phdr) & ~(flags)) ) #define TCP_TCPLEN(seg) ((seg)->len + ((TCPH_FLAGS((seg)->tcphdr) & (TCP_FIN | TCP_SYN)) != 0)) enum tcp_state { CLOSED = 0, LISTEN = 1, SYN_SENT = 2, SYN_RCVD = 3, ESTABLISHED = 4, FIN_WAIT_1 = 5, FIN_WAIT_2 = 6, CLOSE_WAIT = 7, CLOSING = 8, LAST_ACK = 9, TIME_WAIT = 10 }; /** Flags used on input processing, not on pcb->flags */ #define TF_RESET (u8_t)0x08U /* Connection was reset. */ #define TF_CLOSED (u8_t)0x10U /* Connection was sucessfully closed. */ #define TF_GOT_FIN (u8_t)0x20U /* Connection was closed by the remote end. */ #if LWIP_CALLBACK_API /* Function to call when a listener has been connected. * @param arg user-supplied argument (tcp_pcb.callback_arg) * @param pcb a new tcp_pcb that now is connected * @param err an error argument (TODO: that is current always ERR_OK?) * @return ERR_OK: accept the new connection, * any other err_t abortsthe new connection */ #define DEF_ACCEPT_CALLBACK err_t (* accept)(void *arg, struct tcp_pcb *newpcb, err_t err) #else /* LWIP_CALLBACK_API */ #define DEF_ACCEPT_CALLBACK #endif /* LWIP_CALLBACK_API */ /** * members common to struct tcp_pcb and struct tcp_listen_pcb */ #define TCP_PCB_COMMON(type) \ type *next; /* for the linked list */ \ enum tcp_state state; /* TCP state */ \ u8_t prio; \ void *callback_arg; \ /* ports are in host byte order */ \ u16_t local_port; \ /* the accept callback for listen- and normal pcbs, if LWIP_CALLBACK_API */ \ DEF_ACCEPT_CALLBACK /* the TCP protocol control block */ struct tcp_pcb { /** common PCB members */ IP_PCB; /** protocol specific PCB members */ TCP_PCB_COMMON(struct tcp_pcb); /* ports are in host byte order */ u16_t remote_port; u8_t flags; #define TF_ACK_DELAY ((u8_t)0x01U) /* Delayed ACK. */ #define TF_ACK_NOW ((u8_t)0x02U) /* Immediate ACK. */ #define TF_INFR ((u8_t)0x04U) /* In fast recovery. */ #define TF_TIMESTAMP ((u8_t)0x08U) /* Timestamp option enabled */ #define TF_FIN ((u8_t)0x20U) /* Connection was closed locally (FIN segment enqueued). */ #define TF_NODELAY ((u8_t)0x40U) /* Disable Nagle algorithm */ #define TF_NAGLEMEMERR ((u8_t)0x80U) /* nagle enabled, memerr, try to output to prevent delayed ACK to happen */ /* the rest of the fields are in host byte order as we have to do some math with them */ /* receiver variables */ u32_t rcv_nxt; /* next seqno expected */ u16_t rcv_wnd; /* receiver window available */ u16_t rcv_ann_wnd; /* receiver window to announce */ u32_t rcv_ann_right_edge; /* announced right edge of window */ /* Timers */ u32_t tmr; u8_t polltmr, pollinterval; /* Retransmission timer. */ s16_t rtime; u16_t mss; /* maximum segment size */ /* RTT (round trip time) estimation variables */ u32_t rttest; /* RTT estimate in 500ms ticks */ u32_t rtseq; /* sequence number being timed */ s16_t sa, sv; /* @todo document this */ s16_t rto; /* retransmission time-out */ u8_t nrtx; /* number of retransmissions */ /* fast retransmit/recovery */ u32_t lastack; /* Highest acknowledged seqno. */ u8_t dupacks; /* congestion avoidance/control variables */ u16_t cwnd; u16_t ssthresh; /* sender variables */ u32_t snd_nxt; /* next new seqno to be sent */ u16_t snd_wnd; /* sender window */ u32_t snd_wl1, snd_wl2; /* Sequence and acknowledgement numbers of last window update. */ u32_t snd_lbb; /* Sequence number of next byte to be buffered. */ u16_t acked; u16_t snd_buf; /* Available buffer space for sending (in bytes). */ #define TCP_SNDQUEUELEN_OVERFLOW (0xffff-3) u16_t snd_queuelen; /* Available buffer space for sending (in tcp_segs). */ /* These are ordered by sequence number: */ struct tcp_seg *unsent; /* Unsent (queued) segments. */ struct tcp_seg *unacked; /* Sent but unacknowledged segments. */ #if TCP_QUEUE_OOSEQ struct tcp_seg *ooseq; /* Received out of sequence segments. */ #endif /* TCP_QUEUE_OOSEQ */ struct pbuf *refused_data; /* Data previously received but not yet taken by upper layer */ #if LWIP_CALLBACK_API /* Function to be called when more send buffer space is available. * @param arg user-supplied argument (tcp_pcb.callback_arg) * @param pcb the tcp_pcb which has send buffer space available * @param space the amount of bytes available * @return ERR_OK: try to send some data by calling tcp_output */ err_t (* sent)(void *arg, struct tcp_pcb *pcb, u16_t space); /* Function to be called when (in-sequence) data has arrived. * @param arg user-supplied argument (tcp_pcb.callback_arg) * @param pcb the tcp_pcb for which data has arrived * @param p the packet buffer which arrived * @param err an error argument (TODO: that is current always ERR_OK?) * @return ERR_OK: try to send some data by calling tcp_output */ err_t (* recv)(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err); /* Function to be called when a connection has been set up. * @param arg user-supplied argument (tcp_pcb.callback_arg) * @param pcb the tcp_pcb that now is connected * @param err an error argument (TODO: that is current always ERR_OK?) * @return value is currently ignored */ err_t (* connected)(void *arg, struct tcp_pcb *pcb, err_t err); /* Function which is called periodically. * The period can be adjusted in multiples of the TCP slow timer interval * by changing tcp_pcb.polltmr. * @param arg user-supplied argument (tcp_pcb.callback_arg) * @param pcb the tcp_pcb to poll for * @return ERR_OK: try to send some data by calling tcp_output */ err_t (* poll)(void *arg, struct tcp_pcb *pcb); /* Function to be called whenever a fatal error occurs. * There is no pcb parameter since most of the times, the pcb is * already deallocated (or there is no pcb) when this function is called. * @param arg user-supplied argument (tcp_pcb.callback_arg) * @param err an indication why the error callback is called: * ERR_ABRT: aborted through tcp_abort or by a TCP timer * ERR_RST: the connection was reset by the remote host */ void (* errf)(void *arg, err_t err); #endif /* LWIP_CALLBACK_API */ #if LWIP_TCP_TIMESTAMPS u32_t ts_lastacksent; u32_t ts_recent; #endif /* LWIP_TCP_TIMESTAMPS */ /* idle time before KEEPALIVE is sent */ u32_t keep_idle; #if LWIP_TCP_KEEPALIVE u32_t keep_intvl; u32_t keep_cnt; #endif /* LWIP_TCP_KEEPALIVE */ /* Persist timer counter */ u32_t persist_cnt; /* Persist timer back-off */ u8_t persist_backoff; /* KEEPALIVE counter */ u8_t keep_cnt_sent; }; struct tcp_pcb_listen { /* Common members of all PCB types */ IP_PCB; /* Protocol specific PCB members */ TCP_PCB_COMMON(struct tcp_pcb_listen); #if TCP_LISTEN_BACKLOG u8_t backlog; u8_t accepts_pending; #endif /* TCP_LISTEN_BACKLOG */ }; #if LWIP_EVENT_API enum lwip_event { LWIP_EVENT_ACCEPT, LWIP_EVENT_SENT, LWIP_EVENT_RECV, LWIP_EVENT_CONNECTED, LWIP_EVENT_POLL, LWIP_EVENT_ERR }; err_t lwip_tcp_event(void *arg, struct tcp_pcb *pcb, enum lwip_event, struct pbuf *p, u16_t size, err_t err); #define TCP_EVENT_ACCEPT(pcb,err,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\ LWIP_EVENT_ACCEPT, NULL, 0, err) #define TCP_EVENT_SENT(pcb,space,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\ LWIP_EVENT_SENT, NULL, space, ERR_OK) #define TCP_EVENT_RECV(pcb,p,err,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\ LWIP_EVENT_RECV, (p), 0, (err)) #define TCP_EVENT_CONNECTED(pcb,err,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\ LWIP_EVENT_CONNECTED, NULL, 0, (err)) #define TCP_EVENT_POLL(pcb,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\ LWIP_EVENT_POLL, NULL, 0, ERR_OK) #define TCP_EVENT_ERR(errf,arg,err) lwip_tcp_event((arg), NULL, \ LWIP_EVENT_ERR, NULL, 0, (err)) #else /* LWIP_EVENT_API */ #define TCP_EVENT_ACCEPT(pcb,err,ret) \ do { \ if((pcb)->accept != NULL) \ (ret) = (pcb)->accept((pcb)->callback_arg,(pcb),(err)); \ else (ret) = ERR_OK; \ } while (0) #define TCP_EVENT_SENT(pcb,space,ret) \ do { \ if((pcb)->sent != NULL) \ (ret) = (pcb)->sent((pcb)->callback_arg,(pcb),(space)); \ else (ret) = ERR_OK; \ } while (0) #define TCP_EVENT_RECV(pcb,p,err,ret) \ do { \ if((pcb)->recv != NULL) { \ (ret) = (pcb)->recv((pcb)->callback_arg,(pcb),(p),(err)); \ } else { \ (ret) = tcp_recv_null(NULL, (pcb), (p), (err)); \ } \ } while (0) #define TCP_EVENT_CONNECTED(pcb,err,ret) \ do { \ if((pcb)->connected != NULL) \ (ret) = (pcb)->connected((pcb)->callback_arg,(pcb),(err)); \ else (ret) = ERR_OK; \ } while (0) #define TCP_EVENT_POLL(pcb,ret) \ do { \ if((pcb)->poll != NULL) \ (ret) = (pcb)->poll((pcb)->callback_arg,(pcb)); \ else (ret) = ERR_OK; \ } while (0) #define TCP_EVENT_ERR(errf,arg,err) \ do { \ if((errf) != NULL) \ (errf)((arg),(err)); \ } while (0) #endif /* LWIP_EVENT_API */ /* This structure represents a TCP segment on the unsent and unacked queues */ struct tcp_seg { struct tcp_seg *next; /* used when putting segements on a queue */ struct pbuf *p; /* buffer containing data + TCP header */ void *dataptr; /* pointer to the TCP data in the pbuf */ u16_t len; /* the TCP length of this segment */ u8_t flags; #define TF_SEG_OPTS_MSS (u8_t)0x01U /* Include MSS option. */ #define TF_SEG_OPTS_TS (u8_t)0x02U /* Include timestamp option. */ struct tcp_hdr *tcphdr; /* the TCP header */ }; #define LWIP_TCP_OPT_LENGTH(flags) \ (flags & TF_SEG_OPTS_MSS ? 4 : 0) + \ (flags & TF_SEG_OPTS_TS ? 12 : 0) /** This returns a TCP header option for MSS in an u32_t */ #define TCP_BUILD_MSS_OPTION(x) (x) = htonl(((u32_t)2 << 24) | \ ((u32_t)4 << 16) | \ (((u32_t)TCP_MSS / 256) << 8) | \ (TCP_MSS & 255)) /* Internal functions and global variables: */ struct tcp_pcb *tcp_pcb_copy(struct tcp_pcb *pcb); void tcp_pcb_purge(struct tcp_pcb *pcb); void tcp_pcb_remove(struct tcp_pcb **pcblist, struct tcp_pcb *pcb); u8_t tcp_segs_free(struct tcp_seg *seg); u8_t tcp_seg_free(struct tcp_seg *seg); struct tcp_seg *tcp_seg_copy(struct tcp_seg *seg); #define tcp_ack(pcb) \ do { \ if((pcb)->flags & TF_ACK_DELAY) { \ (pcb)->flags &= ~TF_ACK_DELAY; \ (pcb)->flags |= TF_ACK_NOW; \ tcp_output(pcb); \ } \ else { \ (pcb)->flags |= TF_ACK_DELAY; \ } \ } while (0) #define tcp_ack_now(pcb) \ do { \ (pcb)->flags |= TF_ACK_NOW; \ tcp_output(pcb); \ } while (0) err_t tcp_send_ctrl(struct tcp_pcb *pcb, u8_t flags); err_t tcp_enqueue(struct tcp_pcb *pcb, void *dataptr, u16_t len, u8_t flags, u8_t apiflags, u8_t optflags); void tcp_rexmit_seg(struct tcp_pcb *pcb, struct tcp_seg *seg); void tcp_rst(u32_t seqno, u32_t ackno, struct ip_addr *local_ip, struct ip_addr *remote_ip, u16_t local_port, u16_t remote_port); u32_t tcp_next_iss(void); void tcp_keepalive(struct tcp_pcb *pcb); void tcp_zero_window_probe(struct tcp_pcb *pcb); #if TCP_CALCULATE_EFF_SEND_MSS u16_t tcp_eff_send_mss(u16_t sendmss, struct ip_addr *addr); #endif /* TCP_CALCULATE_EFF_SEND_MSS */ #if LWIP_CALLBACK_API err_t tcp_recv_null(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err); #endif /* LWIP_CALLBACK_API */ extern struct tcp_pcb *tcp_input_pcb; extern u32_t tcp_ticks; const char* tcp_debug_state_str(enum tcp_state s); #if TCP_DEBUG || TCP_INPUT_DEBUG || TCP_OUTPUT_DEBUG void tcp_debug_print(struct tcp_hdr *tcphdr); void tcp_debug_print_flags(u8_t flags); void tcp_debug_print_state(enum tcp_state s); void tcp_debug_print_pcbs(void); s16_t tcp_pcbs_sane(void); #else # define tcp_debug_print(tcphdr) # define tcp_debug_print_flags(flags) # define tcp_debug_print_state(s) # define tcp_debug_print_pcbs() # define tcp_pcbs_sane() 1 #endif /* TCP_DEBUG */ #if NO_SYS #define tcp_timer_needed() #else void tcp_timer_needed(void); #endif /* The TCP PCB lists. */ union tcp_listen_pcbs_t { /* List of all TCP PCBs in LISTEN state. */ struct tcp_pcb_listen *listen_pcbs; struct tcp_pcb *pcbs; }; extern union tcp_listen_pcbs_t tcp_listen_pcbs; extern struct tcp_pcb *tcp_active_pcbs; /* List of all TCP PCBs that are in a state in which they accept or send data. */ extern struct tcp_pcb *tcp_tw_pcbs; /* List of all TCP PCBs in TIME-WAIT. */ extern struct tcp_pcb *tcp_tmp_pcb; /* Only used for temporary storage. */ /* Axioms about the above lists: 1) Every TCP PCB that is not CLOSED is in one of the lists. 2) A PCB is only in one of the lists. 3) All PCBs in the tcp_listen_pcbs list is in LISTEN state. 4) All PCBs in the tcp_tw_pcbs list is in TIME-WAIT state. */ /* Define two macros, TCP_REG and TCP_RMV that registers a TCP PCB with a PCB list or removes a PCB from a list, respectively. */ #if 0 #define TCP_REG(pcbs, npcb) do {\ LWIP_DEBUGF(TCP_DEBUG, ("TCP_REG %p local port %d\n", npcb, npcb->local_port)); \ for(tcp_tmp_pcb = *pcbs; \ tcp_tmp_pcb != NULL; \ tcp_tmp_pcb = tcp_tmp_pcb->next) { \ LWIP_ASSERT("TCP_REG: already registered\n", tcp_tmp_pcb != npcb); \ } \ LWIP_ASSERT("TCP_REG: pcb->state != CLOSED", npcb->state != CLOSED); \ npcb->next = *pcbs; \ LWIP_ASSERT("TCP_REG: npcb->next != npcb", npcb->next != npcb); \ *(pcbs) = npcb; \ LWIP_ASSERT("TCP_RMV: tcp_pcbs sane", tcp_pcbs_sane()); \ tcp_timer_needed(); \ } while(0) #define TCP_RMV(pcbs, npcb) do { \ LWIP_ASSERT("TCP_RMV: pcbs != NULL", *pcbs != NULL); \ LWIP_DEBUGF(TCP_DEBUG, ("TCP_RMV: removing %p from %p\n", npcb, *pcbs)); \ if(*pcbs == npcb) { \ *pcbs = (*pcbs)->next; \ } else for(tcp_tmp_pcb = *pcbs; tcp_tmp_pcb != NULL; tcp_tmp_pcb = tcp_tmp_pcb->next) { \ if(tcp_tmp_pcb->next == npcb) { \ tcp_tmp_pcb->next = npcb->next; \ break; \ } \ } \ npcb->next = NULL; \ LWIP_ASSERT("TCP_RMV: tcp_pcbs sane", tcp_pcbs_sane()); \ LWIP_DEBUGF(TCP_DEBUG, ("TCP_RMV: removed %p from %p\n", npcb, *pcbs)); \ } while(0) #else /* LWIP_DEBUG */ #define TCP_REG(pcbs, npcb) \ do { \ npcb->next = *pcbs; \ *(pcbs) = npcb; \ tcp_timer_needed(); \ } while (0) #define TCP_RMV(pcbs, npcb) \ do { \ if(*(pcbs) == npcb) { \ (*(pcbs)) = (*pcbs)->next; \ } \ else { \ for(tcp_tmp_pcb = *pcbs; \ tcp_tmp_pcb != NULL; \ tcp_tmp_pcb = tcp_tmp_pcb->next) { \ if(tcp_tmp_pcb->next == npcb) { \ tcp_tmp_pcb->next = npcb->next; \ break; \ } \ } \ } \ npcb->next = NULL; \ } while(0) #endif /* LWIP_DEBUG */ #ifdef __cplusplus } #endif #endif /* LWIP_TCP */ #endif /* __LWIP_TCP_H__ */
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