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Clean-up source comment documentation for Doxygen.
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likewise
parent
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149
src/core/tcp.c
149
src/core/tcp.c
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@ -2,6 +2,11 @@
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* @file
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*
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* Transmission Control Protocol for IP
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*
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* This file contains common functions for the TCP implementation, such as functinos
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* for manipulating the data structures and the TCP timer functions. TCP functions
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* related to input and output is found in tcp_input.c and tcp_output.c respectively.
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*
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*/
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/*
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@ -36,17 +41,6 @@
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*
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*/
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/* tcp.c
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*
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* This file contains common functions for the TCP implementation, such as functinos
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* for manipulating the data structures and the TCP timer functions. TCP functions
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* related to input and output is found in tcp_input.c and tcp_output.c respectively.
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*
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*/
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#include "lwip/opt.h"
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#include "lwip/def.h"
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#include "lwip/mem.h"
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@ -63,26 +57,22 @@ const u8_t tcp_backoff[13] =
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/* The TCP PCB lists. */
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/* List of all TCP PCBs in LISTEN state. */
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/** List of all TCP PCBs in LISTEN state */
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union tcp_listen_pcbs_t tcp_listen_pcbs;
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struct tcp_pcb *tcp_active_pcbs; /* List of all TCP PCBs that are in a
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state in which they accept or send
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data. */
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struct tcp_pcb *tcp_tw_pcbs; /* List of all TCP PCBs in TIME-WAIT. */
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/** List of all TCP PCBs that are in a state in which
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* they accept or send data. */
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struct tcp_pcb *tcp_active_pcbs;
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/** List of all TCP PCBs in TIME-WAIT state */
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struct tcp_pcb *tcp_tw_pcbs;
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struct tcp_pcb *tcp_tmp_pcb;
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static u8_t tcp_timer;
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static u16_t tcp_new_port(void);
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/*
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* tcp_init():
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*
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/**
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* Initializes the TCP layer.
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*/
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void
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tcp_init(void)
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{
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@ -98,13 +88,10 @@ tcp_init(void)
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}
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/*
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* tcp_tmr():
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*
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/**
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* Called periodically to dispatch TCP timers.
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*
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*/
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void
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tcp_tmr(void)
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{
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@ -118,13 +105,10 @@ tcp_tmr(void)
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}
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}
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/*
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* tcp_close():
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*
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/**
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* Closes the connection held by the PCB.
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*
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*/
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err_t
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tcp_close(struct tcp_pcb *pcb)
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{
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@ -174,15 +158,12 @@ tcp_close(struct tcp_pcb *pcb)
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return err;
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}
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/*
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* tcp_abort()
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*
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/**
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* Aborts a connection by sending a RST to the remote host and deletes
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* the local protocol control block. This is done when a connection is
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* killed because of shortage of memory.
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*
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*/
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void
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tcp_abort(struct tcp_pcb *pcb)
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{
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@ -231,9 +212,7 @@ tcp_abort(struct tcp_pcb *pcb)
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}
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}
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/*
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* tcp_bind():
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*
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/**
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* Binds the connection to a local portnumber and IP address. If the
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* IP address is not given (i.e., ipaddr == NULL), the IP address of
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* the outgoing network interface is used instead.
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@ -388,16 +367,13 @@ tcp_accept_null(void *arg, struct tcp_pcb *pcb, err_t err)
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}
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#endif /* LWIP_CALLBACK_API */
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/*
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* tcp_listen():
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*
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/**
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* Set the state of the connection to be LISTEN, which means that it
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* is able to accept incoming connections. The protocol control block
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* is reallocated in order to consume less memory. Setting the
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* connection to LISTEN is an irreversible process.
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*
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*/
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struct tcp_pcb *
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tcp_listen(struct tcp_pcb *pcb)
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{
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@ -427,15 +403,12 @@ tcp_listen(struct tcp_pcb *pcb)
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return (struct tcp_pcb *)lpcb;
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}
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/*
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* tcp_recved():
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*
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/**
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* This function should be called by the application when it has
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* processed the data. The purpose is to advertise a larger window
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* when the data has been processed.
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*
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*/
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void
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tcp_recved(struct tcp_pcb *pcb, u16_t len)
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{
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@ -463,13 +436,10 @@ tcp_recved(struct tcp_pcb *pcb, u16_t len)
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len, pcb->rcv_wnd, TCP_WND - pcb->rcv_wnd));
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}
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/*
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* tcp_new_port():
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*
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/**
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* A nastly hack featuring 'goto' statements that allocates a
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* new TCP local port.
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*/
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static u16_t
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tcp_new_port(void)
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{
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@ -503,14 +473,11 @@ tcp_new_port(void)
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return port;
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}
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/*
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* tcp_connect():
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*
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/**
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* Connects to another host. The function given as the "connected"
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* argument will be called when the connection has been established.
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*
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*/
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err_t
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tcp_connect(struct tcp_pcb *pcb, struct ip_addr *ipaddr, u16_t port,
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err_t (* connected)(void *arg, struct tcp_pcb *tpcb, err_t err))
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@ -558,14 +525,11 @@ tcp_connect(struct tcp_pcb *pcb, struct ip_addr *ipaddr, u16_t port,
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return ret;
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}
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/*
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* tcp_slowtmr():
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*
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/**
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* Called every 500 ms and implements the retransmission timer and the timer that
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* removes PCBs that have been in TIME-WAIT for enough time. It also increments
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* various timers such as the inactivity timer in each PCB.
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*/
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void
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tcp_slowtmr(void)
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{
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@ -742,12 +706,9 @@ tcp_slowtmr(void)
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}
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}
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/*
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* tcp_fasttmr():
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*
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/**
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* Is called every TCP_FAST_INTERVAL (250 ms) and sends delayed ACKs.
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*/
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void
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tcp_fasttmr(void)
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{
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@ -763,13 +724,10 @@ tcp_fasttmr(void)
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}
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}
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/*
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* tcp_segs_free():
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*
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/**
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* Deallocates a list of TCP segments (tcp_seg structures).
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*
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*/
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u8_t
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tcp_segs_free(struct tcp_seg *seg)
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{
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@ -783,13 +741,10 @@ tcp_segs_free(struct tcp_seg *seg)
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return count;
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}
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/*
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* tcp_seg_free():
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*
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/**
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* Frees a TCP segment.
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*
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*/
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u8_t
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tcp_seg_free(struct tcp_seg *seg)
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{
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@ -807,13 +762,10 @@ tcp_seg_free(struct tcp_seg *seg)
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return count;
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}
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/*
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* tcp_setprio():
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*
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/**
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* Sets the priority of a connection.
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*
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*/
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void
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tcp_setprio(struct tcp_pcb *pcb, u8_t prio)
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{
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@ -821,13 +773,10 @@ tcp_setprio(struct tcp_pcb *pcb, u8_t prio)
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}
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#if TCP_QUEUE_OOSEQ
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/*
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* tcp_seg_copy():
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*
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/**
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* Returns a copy of the given TCP segment.
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*
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*/
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struct tcp_seg *
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tcp_seg_copy(struct tcp_seg *seg)
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{
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@ -963,12 +912,13 @@ tcp_alloc(u8_t prio)
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return pcb;
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}
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/*
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* tcp_new():
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*
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/**
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* Creates a new TCP protocol control block but doesn't place it on
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* any of the TCP PCB lists.
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*
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* @internal: Maybe there should be a idle TCP PCB list where these
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* PCBs are put on. We can then implement port reservation using
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* tcp_bind(). Currently, we lack this (BSD socket type of) feature.
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*/
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struct tcp_pcb *
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@ -992,14 +942,11 @@ tcp_arg(struct tcp_pcb *pcb, void *arg)
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}
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#if LWIP_CALLBACK_API
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/*
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* tcp_recv():
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*
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/**
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* Used to specify the function that should be called when a TCP
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* connection receives data.
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*
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*/
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void
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tcp_recv(struct tcp_pcb *pcb,
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err_t (* recv)(void *arg, struct tcp_pcb *tpcb, struct pbuf *p, err_t err))
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@ -1007,9 +954,7 @@ tcp_recv(struct tcp_pcb *pcb,
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pcb->recv = recv;
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}
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/*
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* tcp_sent():
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*
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/**
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* Used to specify the function that should be called when TCP data
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* has been successfully delivered to the remote host.
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*
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@ -1022,14 +967,11 @@ tcp_sent(struct tcp_pcb *pcb,
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pcb->sent = sent;
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}
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/*
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* tcp_err():
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*
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/**
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* Used to specify the function that should be called when a fatal error
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* has occured on the connection.
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*
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*/
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void
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tcp_err(struct tcp_pcb *pcb,
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void (* errf)(void *arg, err_t err))
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@ -1037,14 +979,11 @@ tcp_err(struct tcp_pcb *pcb,
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pcb->errf = errf;
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}
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/*
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* tcp_accept():
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*
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/**
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* Used for specifying the function that should be called when a
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* LISTENing connection has been connected to another host.
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*
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*/
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void
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tcp_accept(struct tcp_pcb *pcb,
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err_t (* accept)(void *arg, struct tcp_pcb *newpcb, err_t err))
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@ -1054,15 +993,12 @@ tcp_accept(struct tcp_pcb *pcb,
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#endif /* LWIP_CALLBACK_API */
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/*
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* tcp_poll():
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*
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/**
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* Used to specify the function that should be called periodically
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* from TCP. The interval is specified in terms of the TCP coarse
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* timer interval, which is called twice a second.
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*
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*/
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void
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tcp_poll(struct tcp_pcb *pcb,
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err_t (* poll)(void *arg, struct tcp_pcb *tpcb), u8_t interval)
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@ -1073,13 +1009,10 @@ tcp_poll(struct tcp_pcb *pcb,
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pcb->pollinterval = interval;
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}
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/*
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* tcp_pcb_purge():
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*
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/**
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* Purges a TCP PCB. Removes any buffered data and frees the buffer memory.
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*
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*/
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void
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tcp_pcb_purge(struct tcp_pcb *pcb)
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{
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@ -1109,13 +1042,10 @@ tcp_pcb_purge(struct tcp_pcb *pcb)
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}
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}
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/*
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* tcp_pcb_remove():
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*
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/**
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* Purges the PCB and removes it from a PCB list. Any delayed ACKs are sent first.
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*
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*/
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void
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tcp_pcb_remove(struct tcp_pcb **pcblist, struct tcp_pcb *pcb)
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{
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@ -1135,13 +1065,10 @@ tcp_pcb_remove(struct tcp_pcb **pcblist, struct tcp_pcb *pcb)
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LWIP_ASSERT("tcp_pcb_remove: tcp_pcbs_sane()", tcp_pcbs_sane());
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}
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/*
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* tcp_next_iss():
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*
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/**
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* Calculates a new initial sequence number for new connections.
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*
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*/
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u32_t
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tcp_next_iss(void)
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{
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