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devilutionX-lwip/src/api/api_msg.c

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/**
* @file
* Sequential API Internal module
*
*/
/*
* 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>
*
*/
#include "lwip/opt.h"
#if LWIP_NETCONN /* don't build if not configured for use in lwipopts.h */
#include "lwip/api_msg.h"
#include "lwip/memp.h"
#include "lwip/sys.h"
#include "lwip/tcpip.h"
#include "lwip/igmp.h"
/* forward declarations */
#if LWIP_TCP
static err_t do_writemore(struct netconn *conn);
static void do_close_internal(struct netconn *conn);
#endif
#if LWIP_RAW
/**
* Receive callback function for RAW netconns.
* Doesn't 'eat' the packet, only references it and sends it to
* conn->recvmbox
*
* @see raw.h (struct raw_pcb.recv) for parameters and return value
*/
static u8_t
recv_raw(void *arg, struct raw_pcb *pcb, struct pbuf *p,
struct ip_addr *addr)
{
struct netbuf *buf;
struct netconn *conn;
conn = arg;
#if LWIP_SO_RCVBUF
if ((conn != NULL) && (conn->recvmbox != SYS_MBOX_NULL) &&
(((int)(conn->recv_avail) + (int)(p->tot_len)) <= conn->recv_bufsize)) {
#else /* LWIP_SO_RCVBUF */
if ((conn != NULL) && (conn->recvmbox != SYS_MBOX_NULL)) {
#endif /* LWIP_SO_RCVBUF */
buf = memp_malloc(MEMP_NETBUF);
if (buf == NULL) {
return 0;
}
pbuf_ref(p);
buf->p = p;
buf->ptr = p;
buf->addr = addr;
buf->port = pcb->protocol;
conn->recv_avail += p->tot_len;
/* Register event with callback */
API_EVENT(conn, NETCONN_EVT_RCVPLUS, p->tot_len);
sys_mbox_post(conn->recvmbox, buf);
}
return 0; /* do not eat the packet */
}
#endif /* LWIP_RAW*/
#if LWIP_UDP
/**
* Receive callback function for UDP netconns.
* Posts the packet to conn->recvmbox or deletes it on memory error.
*
* @see udp.h (struct udp_pcb.recv) for parameters
*/
static void
recv_udp(void *arg, struct udp_pcb *pcb, struct pbuf *p,
struct ip_addr *addr, u16_t port)
{
struct netbuf *buf;
struct netconn *conn;
LWIP_UNUSED_ARG(pcb);
conn = arg;
#if LWIP_SO_RCVBUF
if ((conn == NULL) || (conn->recvmbox == SYS_MBOX_NULL) ||
(((int)(conn->recv_avail) + (int)(p->tot_len)) > conn->recv_bufsize)) {
#else /* LWIP_SO_RCVBUF */
if ((conn == NULL) || (conn->recvmbox == SYS_MBOX_NULL)) {
#endif /* LWIP_SO_RCVBUF */
pbuf_free(p);
return;
}
buf = memp_malloc(MEMP_NETBUF);
if (buf == NULL) {
pbuf_free(p);
return;
} else {
buf->p = p;
buf->ptr = p;
buf->addr = addr;
buf->port = port;
}
conn->recv_avail += p->tot_len;
/* Register event with callback */
API_EVENT(conn, NETCONN_EVT_RCVPLUS, p->tot_len);
sys_mbox_post(conn->recvmbox, buf);
}
#endif /* LWIP_UDP */
#if LWIP_TCP
/**
* Receive callback function for TCP netconns.
* Posts the packet to conn->recvmbox or deletes it on memory error.
*
* @see tcp.h (struct tcp_pcb.recv) for parameters and return value
*/
static err_t
recv_tcp(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err)
{
struct netconn *conn;
u16_t len;
LWIP_UNUSED_ARG(pcb);
conn = arg;
if ((conn == NULL) || (conn->recvmbox == SYS_MBOX_NULL)) {
pbuf_free(p);
return ERR_VAL;
}
conn->err = err;
if (p != NULL) {
len = p->tot_len;
conn->recv_avail += len;
} else {
len = 0;
}
/* Register event with callback */
API_EVENT(conn, NETCONN_EVT_RCVPLUS, len);
sys_mbox_post(conn->recvmbox, p);
return ERR_OK;
}
/**
* Poll callback function for TCP netconns.
* Wakes up an application thread that waits for a connection to close
* or data to be sent. The application thread then takes the
* appropriate action to go on.
*
* Signals the conn->sem.
* netconn_close waits for conn->sem if closing failed.
*
* @see tcp.h (struct tcp_pcb.poll) for parameters and return value
*/
static err_t
poll_tcp(void *arg, struct tcp_pcb *pcb)
{
struct netconn *conn = arg;
LWIP_UNUSED_ARG(pcb);
LWIP_ASSERT("conn != NULL", (conn != NULL));
if (conn->state == NETCONN_WRITE) {
do_writemore(conn);
} else if (conn->state == NETCONN_CLOSE) {
do_close_internal(conn);
}
return ERR_OK;
}
/**
* Sent callback function for TCP netconns.
* Signals the conn->sem and calls API_EVENT.
* netconn_write waits for conn->sem if send buffer is low.
*
* @see tcp.h (struct tcp_pcb.sent) for parameters and return value
*/
static err_t
sent_tcp(void *arg, struct tcp_pcb *pcb, u16_t len)
{
struct netconn *conn = arg;
LWIP_UNUSED_ARG(pcb);
LWIP_ASSERT("conn != NULL", (conn != NULL));
if (conn->state == NETCONN_WRITE) {
LWIP_ASSERT("conn->pcb.tcp != NULL", conn->pcb.tcp != NULL);
do_writemore(conn);
} else if (conn->state == NETCONN_CLOSE) {
do_close_internal(conn);
}
if (conn) {
if ((conn->pcb.tcp != NULL) && (tcp_sndbuf(conn->pcb.tcp) > TCP_SNDLOWAT)) {
API_EVENT(conn, NETCONN_EVT_SENDPLUS, len);
}
}
return ERR_OK;
}
/**
* Error callback function for TCP netconns.
* Signals conn->sem, posts to all conn mboxes and calls API_EVENT.
* The application thread has then to decide what to do.
*
* @see tcp.h (struct tcp_pcb.err) for parameters
*/
static void
err_tcp(void *arg, err_t err)
{
struct netconn *conn;
conn = arg;
LWIP_ASSERT("conn != NULL", (conn != NULL));
conn->pcb.tcp = NULL;
conn->err = err;
if (conn->recvmbox != SYS_MBOX_NULL) {
/* Register event with callback */
API_EVENT(conn, NETCONN_EVT_RCVPLUS, 0);
sys_mbox_post(conn->recvmbox, NULL);
}
if (conn->mbox != SYS_MBOX_NULL && conn->state == NETCONN_CONNECT) {
conn->state = NETCONN_NONE;
sys_mbox_post(conn->mbox, NULL);
}
if (conn->acceptmbox != SYS_MBOX_NULL) {
/* Register event with callback */
API_EVENT(conn, NETCONN_EVT_RCVPLUS, 0);
sys_mbox_post(conn->acceptmbox, NULL);
}
if ((conn->state == NETCONN_WRITE) || (conn->state == NETCONN_CLOSE)) {
/* calling do_writemore/do_close_internal is not necessary
since the pcb has already been deleted! */
conn->state = NETCONN_NONE;
/* wake up the waiting task */
sys_mbox_post(conn->mbox, NULL);
}
}
/**
* Setup a tcp_pcb with the correct callback function pointers
* and their arguments.
*
* @param conn the TCP netconn to setup
*/
static void
setup_tcp(struct netconn *conn)
{
struct tcp_pcb *pcb;
pcb = conn->pcb.tcp;
tcp_arg(pcb, conn);
tcp_recv(pcb, recv_tcp);
tcp_sent(pcb, sent_tcp);
tcp_poll(pcb, poll_tcp, 4);
tcp_err(pcb, err_tcp);
}
/**
* Accept callback function for TCP netconns.
* Allocates a new netconn and posts that to conn->acceptmbox.
*
* @see tcp.h (struct tcp_pcb_listen.accept) for parameters and return value
*/
static err_t
accept_function(void *arg, struct tcp_pcb *newpcb, err_t err)
{
struct netconn *newconn;
struct netconn *conn;
#if API_MSG_DEBUG
#if TCP_DEBUG
tcp_debug_print_state(newpcb->state);
#endif /* TCP_DEBUG */
#endif /* API_MSG_DEBUG */
conn = (struct netconn *)arg;
LWIP_ERROR("accept_function: invalid conn->acceptmbox",
conn->acceptmbox != SYS_MBOX_NULL, return ERR_VAL;);
newconn = memp_malloc(MEMP_NETCONN);
if (newconn == NULL) {
return ERR_MEM;
}
newconn->recvmbox = sys_mbox_new();
if (newconn->recvmbox == SYS_MBOX_NULL) {
memp_free(MEMP_NETCONN, newconn);
return ERR_MEM;
}
newconn->mbox = sys_mbox_new();
if (newconn->mbox == SYS_MBOX_NULL) {
sys_mbox_free(newconn->recvmbox);
memp_free(MEMP_NETCONN, newconn);
return ERR_MEM;
}
/* Allocations were OK, setup the PCB etc */
newconn->type = NETCONN_TCP;
newconn->pcb.tcp = newpcb;
setup_tcp(newconn);
newconn->state = NETCONN_NONE;
newconn->acceptmbox = SYS_MBOX_NULL;
newconn->err = err;
/* Register event with callback */
API_EVENT(conn, NETCONN_EVT_RCVPLUS, 0);
/* We have to set the callback here even though
* the new socket is unknown. Mark the socket as -1. */
newconn->callback = conn->callback;
newconn->socket = -1;
newconn->recv_avail = 0;
#if LWIP_SO_RCVTIMEO
newconn->recv_timeout = 0;
#endif /* LWIP_SO_RCVTIMEO */
#if LWIP_SO_RCVBUF
newconn->recv_bufsize = INT_MAX;
#endif /* LWIP_SO_RCVBUF */
sys_mbox_post(conn->acceptmbox, newconn);
return ERR_OK;
}
#endif /* LWIP_TCP */
/**
* Create a new pcb of a specific type.
* Called from do_newconn().
*
* @param msg the api_msg_msg describing the connection type
* @return msg->conn->err, but the return value is currently ignored
*/
static err_t
pcb_new(struct api_msg_msg *msg)
{
msg->conn->err = ERR_OK;
/* Allocate a PCB for this connection */
switch(NETCONNTYPE_GROUP(msg->conn->type)) {
#if LWIP_RAW
case NETCONN_RAW:
msg->conn->pcb.raw = raw_new(msg->msg.n.proto);
if(msg->conn->pcb.raw == NULL) {
msg->conn->err = ERR_MEM;
break;
}
raw_recv(msg->conn->pcb.raw, recv_raw, msg->conn);
break;
#endif /* LWIP_RAW */
#if LWIP_UDP
case NETCONN_UDP:
msg->conn->pcb.udp = udp_new();
if(msg->conn->pcb.udp == NULL) {
msg->conn->err = ERR_MEM;
break;
}
#if LWIP_UDPLITE
if (msg->conn->type==NETCONN_UDPLITE) {
udp_setflags(msg->conn->pcb.udp, UDP_FLAGS_UDPLITE);
}
#endif /* LWIP_UDPLITE */
if (msg->conn->type==NETCONN_UDPNOCHKSUM) {
udp_setflags(msg->conn->pcb.udp, UDP_FLAGS_NOCHKSUM);
}
udp_recv(msg->conn->pcb.udp, recv_udp, msg->conn);
break;
#endif /* LWIP_UDP */
#if LWIP_TCP
case NETCONN_TCP:
msg->conn->pcb.tcp = tcp_new();
if(msg->conn->pcb.tcp == NULL) {
msg->conn->err = ERR_MEM;
break;
}
setup_tcp(msg->conn);
break;
#endif /* LWIP_TCP */
default:
/* Unsupported netconn type, e.g. protocol disabled */
msg->conn->err = ERR_VAL;
break;
}
return msg->conn->err;
}
/**
* Create a new pcb of a specific type inside a netconn.
* Called from netconn_new_with_proto_and_callback.
*
* @param msg the api_msg_msg describing the connection type
*/
void
do_newconn(struct api_msg_msg *msg)
{
if(msg->conn->pcb.tcp == NULL) {
pcb_new(msg);
}
/* Else? This "new" connection already has a PCB allocated. */
/* Is this an error condition? Should it be deleted? */
/* We currently just are happy and return. */
TCPIP_APIMSG_ACK(msg);
}
#if LWIP_TCP
static void
do_close_internal(struct netconn *conn)
{
err_t err;
LWIP_ASSERT("invalid conn", (conn != NULL));
LWIP_ASSERT("this is for tcp netconns only", (conn->type == NETCONN_TCP));
LWIP_ASSERT("conn must be in state NETCONN_CLOSE", (conn->state == NETCONN_CLOSE));
LWIP_ASSERT("pcb already closed", (conn->pcb.tcp != NULL));
/* Set back some callback pointers */
if (conn->pcb.tcp->state == LISTEN) {
tcp_arg(conn->pcb.tcp, NULL);
tcp_accept(conn->pcb.tcp, NULL);
} else {
tcp_recv(conn->pcb.tcp, NULL);
}
/* Try to close the connection */
err = tcp_close(conn->pcb.tcp);
if (err == ERR_OK) {
/* Closing succeeded */
conn->state = NETCONN_NONE;
/* Set back some callback pointers as conn is going away */
tcp_err(conn->pcb.tcp, NULL);
tcp_poll(conn->pcb.tcp, NULL, 4);
tcp_sent(conn->pcb.tcp, NULL);
tcp_recv(conn->pcb.tcp, NULL);
tcp_arg(conn->pcb.tcp, NULL);
conn->pcb.tcp = NULL;
conn->err = ERR_OK;
/* Trigger select() in socket layer. This send should something else so the
errorfd is set, not the read and write fd! */
API_EVENT(conn, NETCONN_EVT_RCVPLUS, 0);
API_EVENT(conn, NETCONN_EVT_SENDPLUS, 0);
/* wake up the application task */
sys_mbox_post(conn->mbox, NULL);
}
/* If closing didn't succeed, we get called again either
from poll_tcp or from sent_tcp */
}
#endif /* LWIP_TCP */
/**
* Delete the pcb inside a netconn.
* Called from netconn_delete.
*
* @param msg the api_msg_msg pointing to the connection
*/
void
do_delconn(struct api_msg_msg *msg)
{
if (msg->conn->pcb.tcp != NULL) {
switch (NETCONNTYPE_GROUP(msg->conn->type)) {
#if LWIP_RAW
case NETCONN_RAW:
raw_remove(msg->conn->pcb.raw);
break;
#endif /* LWIP_RAW */
#if LWIP_UDP
case NETCONN_UDP:
msg->conn->pcb.udp->recv_arg = NULL;
udp_remove(msg->conn->pcb.udp);
break;
#endif /* LWIP_UDP */
#if LWIP_TCP
case NETCONN_TCP:
msg->conn->state = NETCONN_CLOSE;
do_close_internal(msg->conn);
/* API_EVENT is called inside do_close_internal, before releasing
the application thread, so we can return at this point! */
return;
#endif /* LWIP_TCP */
default:
break;
}
}
/* tcp netconns don't come here! */
/* Trigger select() in socket layer. This send should something else so the
errorfd is set, not the read and write fd! */
API_EVENT(msg->conn, NETCONN_EVT_RCVPLUS, 0);
API_EVENT(msg->conn, NETCONN_EVT_SENDPLUS, 0);
if (msg->conn->mbox != SYS_MBOX_NULL) {
sys_mbox_post(msg->conn->mbox, NULL);
}
}
/**
* Bind a pcb contained in a netconn
* Called from netconn_bind.
*
* @param msg the api_msg_msg pointing to the connection and containing
* the IP address and port to bind to
*/
void
do_bind(struct api_msg_msg *msg)
{
if (msg->conn->err == ERR_OK) {
if (msg->conn->pcb.tcp != NULL) {
switch (NETCONNTYPE_GROUP(msg->conn->type)) {
#if LWIP_RAW
case NETCONN_RAW:
msg->conn->err = raw_bind(msg->conn->pcb.raw, msg->msg.bc.ipaddr);
break;
#endif /* LWIP_RAW */
#if LWIP_UDP
case NETCONN_UDP:
msg->conn->err = udp_bind(msg->conn->pcb.udp, msg->msg.bc.ipaddr, msg->msg.bc.port);
break;
#endif /* LWIP_UDP */
#if LWIP_TCP
case NETCONN_TCP:
msg->conn->err = tcp_bind(msg->conn->pcb.tcp, msg->msg.bc.ipaddr, msg->msg.bc.port);
break;
#endif /* LWIP_TCP */
default:
break;
}
} else {
/* msg->conn->pcb is NULL */
msg->conn->err = ERR_VAL;
}
}
TCPIP_APIMSG_ACK(msg);
}
#if LWIP_TCP
/**
* TCP callback function if a connection (opened by tcp_connect/do_connect) has
* been established (or reset by the remote host).
*
* @see tcp.h (struct tcp_pcb.connected) for parameters and return values
*/
static err_t
do_connected(void *arg, struct tcp_pcb *pcb, err_t err)
{
struct netconn *conn;
LWIP_UNUSED_ARG(pcb);
conn = arg;
if (conn == NULL) {
return ERR_VAL;
}
conn->err = err;
if (conn->type == NETCONN_TCP && err == ERR_OK) {
setup_tcp(conn);
}
conn->state = NETCONN_NONE;
sys_mbox_post(conn->mbox, NULL);
return ERR_OK;
}
#endif /* LWIP_TCP */
/**
* Connect a pcb contained inside a netconn
* Called from netconn_connect.
*
* @param msg the api_msg_msg pointing to the connection and containing
* the IP address and port to connect to
*/
void
do_connect(struct api_msg_msg *msg)
{
if (msg->conn->pcb.tcp == NULL) {
sys_mbox_post(msg->conn->mbox, NULL);
return;
}
switch (NETCONNTYPE_GROUP(msg->conn->type)) {
#if LWIP_RAW
case NETCONN_RAW:
msg->conn->err = raw_connect(msg->conn->pcb.raw, msg->msg.bc.ipaddr);
sys_mbox_post(msg->conn->mbox, NULL);
break;
#endif /* LWIP_RAW */
#if LWIP_UDP
case NETCONN_UDP:
msg->conn->err = udp_connect(msg->conn->pcb.udp, msg->msg.bc.ipaddr, msg->msg.bc.port);
sys_mbox_post(msg->conn->mbox, NULL);
break;
#endif /* LWIP_UDP */
#if LWIP_TCP
case NETCONN_TCP:
msg->conn->state = NETCONN_CONNECT;
setup_tcp(msg->conn);
msg->conn->err = tcp_connect(msg->conn->pcb.tcp, msg->msg.bc.ipaddr, msg->msg.bc.port,
do_connected);
/* sys_mbox_post() is called from do_connected (or err_tcp()),
* when the connection is established! */
break;
#endif /* LWIP_TCP */
default:
break;
}
}
/**
* Connect a pcb contained inside a netconn
* Only used for UDP netconns.
* Called from netconn_disconnect.
*
* @param msg the api_msg_msg pointing to the connection to disconnect
*/
void
do_disconnect(struct api_msg_msg *msg)
{
#if LWIP_UDP
if (NETCONNTYPE_GROUP(msg->conn->type) == NETCONN_UDP) {
udp_disconnect(msg->conn->pcb.udp);
}
#endif /* LWIP_UDP */
TCPIP_APIMSG_ACK(msg);
}
/**
* Set a TCP pcb contained in a netconn into listen mode
* Called from netconn_listen.
*
* @param msg the api_msg_msg pointing to the connection
*/
void
do_listen(struct api_msg_msg *msg)
{
#if LWIP_TCP
if (msg->conn->err == ERR_OK) {
if (msg->conn->pcb.tcp != NULL) {
if (msg->conn->type == NETCONN_TCP) {
if (msg->conn->pcb.tcp->state == CLOSED) {
struct tcp_pcb* lpcb = tcp_listen(msg->conn->pcb.tcp);
if (lpcb == NULL) {
msg->conn->err = ERR_MEM;
} else {
if (msg->conn->acceptmbox == SYS_MBOX_NULL) {
if ((msg->conn->acceptmbox = sys_mbox_new()) == SYS_MBOX_NULL) {
msg->conn->err = ERR_MEM;
}
}
if (msg->conn->err == ERR_OK) {
msg->conn->state = NETCONN_LISTEN;
msg->conn->pcb.tcp = lpcb;
tcp_arg(msg->conn->pcb.tcp, msg->conn);
tcp_accept(msg->conn->pcb.tcp, accept_function);
}
}
} else {
msg->conn->err = ERR_CONN;
}
}
}
}
#endif /* LWIP_TCP */
TCPIP_APIMSG_ACK(msg);
}
/**
* Send some data on a RAW or UDP pcb contained in a netconn
* Called from netconn_send
*
* @param msg the api_msg_msg pointing to the connection
*/
void
do_send(struct api_msg_msg *msg)
{
if (msg->conn->err == ERR_OK) {
if (msg->conn->pcb.tcp != NULL) {
switch (NETCONNTYPE_GROUP(msg->conn->type)) {
#if LWIP_RAW
case NETCONN_RAW:
if (msg->msg.b->addr == NULL) {
msg->conn->err = raw_send(msg->conn->pcb.raw, msg->msg.b->p);
} else {
msg->conn->err = raw_sendto(msg->conn->pcb.raw, msg->msg.b->p, msg->msg.b->addr);
}
break;
#endif
#if LWIP_UDP
case NETCONN_UDP:
if (msg->msg.b->addr == NULL) {
msg->conn->err = udp_send(msg->conn->pcb.udp, msg->msg.b->p);
} else {
msg->conn->err = udp_sendto(msg->conn->pcb.udp, msg->msg.b->p, msg->msg.b->addr, msg->msg.b->port);
}
break;
#endif /* LWIP_UDP */
default:
break;
}
}
}
TCPIP_APIMSG_ACK(msg);
}
/**
* Recv some data from a RAW or UDP pcb contained in a netconn
* Called from netconn_recv
*
* @param msg the api_msg_msg pointing to the connection
*/
void
do_recv(struct api_msg_msg *msg)
{
#if LWIP_TCP
if (msg->conn->err == ERR_OK) {
if (msg->conn->pcb.tcp != NULL) {
if (msg->conn->type == NETCONN_TCP) {
tcp_recved(msg->conn->pcb.tcp, msg->msg.r.len);
}
}
}
#endif /* LWIP_TCP */
TCPIP_APIMSG_ACK(msg);
}
#if LWIP_TCP
/**
* See if more data needs to be written from a previous call to netconn_write.
* Called initially from do_write. If the first call can't send all data
* (because of low memory or empty send-buffer), this function is called again
* from sent_tcp() or poll_tcp() to send more data. If all data is sent, the
* blocking application thread (waiting in netconn_write) is released.
*
* @param conn netconn (that is currently in state NETCONN_WRITE) to process
* @return ERR_OK
* ERR_MEM if LWIP_TCPIP_CORE_LOCKING=1 and sending hasn't yet finished
*/
err_t
do_writemore(struct netconn *conn)
{
err_t err;
void *dataptr;
u16_t len, available;
u8_t write_finished = 0;
LWIP_ASSERT("conn->state == NETCONN_WRITE", (conn->state == NETCONN_WRITE));
dataptr = (u8_t*)conn->write_msg->msg.w.dataptr + conn->write_offset;
if ((conn->write_msg->msg.w.len - conn->write_offset > 0xffff)) { /* max_u16_t */
len = 0xffff;
#if LWIP_TCPIP_CORE_LOCKING
conn->write_delayed = 1;
#endif
} else {
len = conn->write_msg->msg.w.len - conn->write_offset;
}
available = tcp_sndbuf(conn->pcb.tcp);
if (available < len) {
/* don't try to write more than sendbuf */
len = available;
#if LWIP_TCPIP_CORE_LOCKING
conn->write_delayed = 1;
#endif
}
err = tcp_write(conn->pcb.tcp, dataptr, len, conn->write_msg->msg.w.apiflags);
LWIP_ASSERT("do_writemore: invalid length!", ((conn->write_offset + len) <= conn->write_msg->msg.w.len));
if (err == ERR_OK) {
conn->write_offset += len;
if (conn->write_offset == conn->write_msg->msg.w.len) {
/* everything was written */
write_finished = 1;
conn->write_msg = NULL;
conn->write_offset = 0;
}
err = tcp_output_nagle(conn->pcb.tcp);
conn->err = err;
if ((err == ERR_OK) && (tcp_sndbuf(conn->pcb.tcp) <= TCP_SNDLOWAT)) {
API_EVENT(conn, NETCONN_EVT_SENDMINUS, len);
}
} else if (err == ERR_MEM) {
#if LWIP_TCPIP_CORE_LOCKING
conn->write_delayed = 1;
#endif
} else {
/* if ERR_MEM, we wait for sent_tcp or poll_tcp to be called */
conn->err = err;
/* since we've had an error (except temporary running out of memory,
we don't try writing any more */
write_finished = 1;
}
if (write_finished) {
/* everything was written: set back connection state
and back to application task */
conn->state = NETCONN_NONE;
#if LWIP_TCPIP_CORE_LOCKING
if (conn->write_delayed != 0)
#endif
{
sys_mbox_post(conn->mbox, NULL);
}
}
#if LWIP_TCPIP_CORE_LOCKING
else
return ERR_MEM;
#endif
return ERR_OK;
}
#endif /* LWIP_TCP */
/**
* Send some data on a TCP pcb contained in a netconn
* Called from netconn_write
*
* @param msg the api_msg_msg pointing to the connection
*/
void
do_write(struct api_msg_msg *msg)
{
if (msg->conn->err == ERR_OK) {
if ((msg->conn->pcb.tcp != NULL) && (msg->conn->type == NETCONN_TCP)) {
#if LWIP_TCP
msg->conn->state = NETCONN_WRITE;
/* set all the variables used by do_writemore */
msg->conn->write_msg = msg;
msg->conn->write_offset = 0;
#if LWIP_TCPIP_CORE_LOCKING
msg->conn->write_delayed = 0;
if (do_writemore(msg->conn) != ERR_OK) {
LWIP_ASSERT("state!", msg->conn->state == NETCONN_WRITE);
UNLOCK_TCPIP_CORE();
sys_arch_mbox_fetch(msg->conn->mbox, NULL, 0);
LOCK_TCPIP_CORE();
LWIP_ASSERT("state!", msg->conn->state == NETCONN_NONE);
}
#else
do_writemore(msg->conn);
#endif
/* for both cases: if do_writemore was called, don't ACK the APIMSG! */
return;
#endif /* LWIP_TCP */
#if (LWIP_UDP || LWIP_RAW)
} else {
msg->conn->err = ERR_VAL;
#endif /* (LWIP_UDP || LWIP_RAW) */
}
}
TCPIP_APIMSG_ACK(msg);
}
/**
* Close a TCP pcb contained in a netconn
* Called from netconn_close
*
* @param msg the api_msg_msg pointing to the connection
*/
void
do_close(struct api_msg_msg *msg)
{
#if LWIP_TCP
if ((msg->conn->pcb.tcp != NULL) && (msg->conn->type == NETCONN_TCP)) {
msg->conn->state = NETCONN_CLOSE;
do_close_internal(msg->conn);
/* for tcp netconns, do_close_internal ACKs the message */
} else
#endif /* LWIP_TCP */
{
msg->conn->err = ERR_VAL;
TCPIP_APIMSG_ACK(msg);
}
}
#if LWIP_IGMP
/**
* Join multicast groups for UDP netconns.
* Called from netconn_join_leave_group
*
* @param msg the api_msg_msg pointing to the connection
*/
void
do_join_leave_group(struct api_msg_msg *msg)
{
if (msg->conn->err == ERR_OK) {
if (msg->conn->pcb.tcp != NULL) {
if (NETCONNTYPE_GROUP(msg->conn->type) == NETCONN_UDP) {
#if LWIP_UDP
if (msg->msg.jl.join_or_leave == NETCONN_JOIN) {
msg->conn->err = igmp_joingroup(msg->msg.jl.interface, msg->msg.jl.multiaddr);
} else {
msg->conn->err = igmp_leavegroup(msg->msg.jl.interface, msg->msg.jl.multiaddr);
}
#endif /* LWIP_UDP */
#if (LWIP_TCP || LWIP_RAW)
} else {
msg->conn->err = ERR_VAL;
#endif /* (LWIP_TCP || LWIP_RAW) */
}
}
}
TCPIP_APIMSG_ACK(msg);
}
#endif /* LWIP_IGMP */
#endif /* LWIP_NETCONN */