tcp.h
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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/sys.h"
- #include "lwip/mem.h"
- #include "lwip/pbuf.h"
- #include "lwip/opt.h"
- #include "lwip/ip.h"
- #include "lwip/icmp.h"
- #include "lwip/err.h"
- struct tcp_pcb;
- /* Functions for interfacing with TCP: */
- /* Lower layer interface to TCP: */
- void tcp_init (void); /* Must be called first to
- initialize TCP. */
- 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)
- 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 (struct tcp_pcb *pcb);
- void tcp_abort (struct tcp_pcb *pcb);
- err_t tcp_close (struct tcp_pcb *pcb);
- err_t tcp_write (struct tcp_pcb *pcb, const void *dataptr, u16_t len,
- u8_t copy);
- 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_output (struct tcp_pcb *pcb);
- void tcp_rexmit (struct tcp_pcb *pcb);
- void tcp_rexmit_rto (struct tcp_pcb *pcb);
- #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. */
- //#define TCP_TMR_INTERVAL 1000
- #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 6 /* x RTO */
- #define TCP_MSL 60000 /* The maximum segment lifetime in microseconds */
- /*
- * User-settable options (used with setsockopt).
- */
- #define TCP_NODELAY 0x01 /* don't delay send to coalesce packets */
- #define TCP_KEEPALIVE 0x02 /* send KEEPALIVE probes when idle for pcb->keepalive miliseconds */
- /* Keepalive values */
- #define TCP_KEEPDEFAULT 7200000 /* KEEPALIVE timer in miliseconds */
- #define TCP_KEEPINTVL 75000 /* Time between KEEPALIVE probes in miliseconds */
- #define TCP_KEEPCNT 9 /* Counter for KEEPALIVE probes */
- #define TCP_MAXIDLE TCP_KEEPCNT * TCP_KEEPINTVL /* Maximum KEEPALIVE probe time */
- #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 = htons((ntohs((phdr)->_hdrlen_rsvd_flags) & ~TCP_FLAGS) | (flags))
- #define TCPH_SET_FLAG(phdr, flags ) (phdr)->_hdrlen_rsvd_flags = htons(ntohs((phdr)->_hdrlen_rsvd_flags) | (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 ||
- TCPH_FLAGS((seg)->tcphdr) & TCP_SYN)? 1: 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
- };
- /* the TCP protocol control block */
- struct tcp_pcb {
- /** common PCB members */
- IP_PCB;
- /** protocol specific PCB members */
- struct tcp_pcb *next; /* for the linked list */
- enum tcp_state state; /* TCP state */
- u8_t prio;
- void *callback_arg;
- u16_t local_port;
- 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_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. */
- #define TF_NODELAY (u8_t)0x40U /* Disable Nagle algorithm */
- /* receiver variables */
- u32_t rcv_nxt; /* next seqno expected */
- u16_t rcv_wnd; /* receiver window */
-
- /* Timers */
- u32_t tmr;
- u8_t polltmr, pollinterval;
-
- /* Retransmission timer. */
- u16_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 */
- u16_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 seqno to be sent */
- snd_max, /* Highest seqno sent. */
- snd_wnd, /* sender window */
- snd_wl1, snd_wl2, /* Sequence and acknowledgement numbers of last
- window update. */
- snd_lbb; /* Sequence number of next byte to be buffered. */
- u16_t acked;
-
- u16_t snd_buf; /* Available buffer space for sending (in bytes). */
- u8_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 */
- #if LWIP_CALLBACK_API
- /* Function to be called when more send buffer space is available. */
- err_t (* sent)(void *arg, struct tcp_pcb *pcb, u16_t space);
-
- /* Function to be called when (in-sequence) data has arrived. */
- 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. */
- err_t (* connected)(void *arg, struct tcp_pcb *pcb, err_t err);
- /* Function to call when a listener has been connected. */
- err_t (* accept)(void *arg, struct tcp_pcb *newpcb, err_t err);
- /* Function which is called periodically. */
- err_t (* poll)(void *arg, struct tcp_pcb *pcb);
- /* Function to be called whenever a fatal error occurs. */
- void (* errf)(void *arg, err_t err);
- #endif /* LWIP_CALLBACK_API */
- /* idle time before KEEPALIVE is sent */
- u32_t keepalive;
-
- /* KEEPALIVE counter */
- u8_t keep_cnt;
- };
- struct tcp_pcb_listen {
- /* Common members of all PCB types */
- IP_PCB;
- /* Protocol specific PCB members */
- struct tcp_pcb_listen *next; /* for the linked list */
-
- /* Even if state is obviously LISTEN this is here for
- * field compatibility with tpc_pcb to which it is cast sometimes
- * Until a cleaner solution emerges this is here.FIXME
- */
- enum tcp_state state; /* TCP state */
- u8_t prio;
- void *callback_arg;
-
- u16_t local_port;
- #if LWIP_CALLBACK_API
- /* Function to call when a listener has been connected. */
- err_t (* accept)(void *arg, struct tcp_pcb *newpcb, err_t err);
- #endif /* LWIP_CALLBACK_API */
- };
- #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
- };*/
- typedef enum {
- LWIP_EVENT_ACCEPT,
- LWIP_EVENT_SENT,
- LWIP_EVENT_RECV,
- LWIP_EVENT_CONNECTED,
- LWIP_EVENT_POLL,
- LWIP_EVENT_ERR
- }LWIP_STATE;
- /*err_t lwip_tcp_event(void *arg, struct tcp_pcb *pcb,
- enum lwip_event,
- struct pbuf *p,
- u16_t size,
- err_t err);*/
-
- err_t lwip_tcp_event(void *arg, struct tcp_pcb *pcb,
- LWIP_STATE 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)
- if((pcb)->accept != NULL)
- (ret = (pcb)->accept((pcb)->callback_arg,(pcb),(err)))
- #define TCP_EVENT_SENT(pcb,space,ret)
- if((pcb)->sent != NULL)
- (ret = (pcb)->sent((pcb)->callback_arg,(pcb),(space)))
- #define TCP_EVENT_RECV(pcb,p,err,ret)
- if((pcb)->recv != NULL)
- { ret = (pcb)->recv((pcb)->callback_arg,(pcb),(p),(err)); } else {
- if (p) pbuf_free(p); }
- #define TCP_EVENT_CONNECTED(pcb,err,ret)
- if((pcb)->connected != NULL)
- (ret = (pcb)->connected((pcb)->callback_arg,(pcb),(err)))
- #define TCP_EVENT_POLL(pcb,ret)
- if((pcb)->poll != NULL)
- (ret = (pcb)->poll((pcb)->callback_arg,(pcb)))
- #define TCP_EVENT_ERR(errf,arg,err)
- if((errf) != NULL)
- (errf)((arg),(err))
- #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 */
- struct tcp_hdr *tcphdr; /* the TCP header */
- };
- /* 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) 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;
- }
- #define tcp_ack_now(pcb) (pcb)->flags |= TF_ACK_NOW;
- tcp_output(pcb)
- 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 copy,
- u8_t *optdata, u8_t optlen);
- 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);
- extern struct tcp_pcb *tcp_input_pcb;
- extern u32_t tcp_ticks;
- #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);
- int 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 %dn", 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 registeredn", 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 %pn", 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 != NULL && 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 %pn", 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 != NULL && tcp_tmp_pcb->next == npcb) {
- tcp_tmp_pcb->next = npcb->next;
- break;
- }
- }
- npcb->next = NULL;
- } while(0)
- #endif /* LWIP_DEBUG */
- #endif /* __LWIP_TCP_H__ */