--- /dev/null
+/**
+ * @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/ip.h"
+#include "lwip/udp.h"
+#include "lwip/tcp.h"
+#include "lwip/raw.h"
+
+#include "lwip/memp.h"
+#include "lwip/tcpip.h"
+#include "lwip/igmp.h"
+#include "lwip/dns.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 pbuf *q;
+ struct netbuf *buf;
+ struct netconn *conn;
+#if LWIP_SO_RCVBUF
+ int recv_avail;
+#endif /* LWIP_SO_RCVBUF */
+
+ LWIP_UNUSED_ARG(addr);
+ conn = arg;
+
+#if LWIP_SO_RCVBUF
+ SYS_ARCH_GET(conn->recv_avail, recv_avail);
+ if ((conn != NULL) && (conn->recvmbox != SYS_MBOX_NULL) &&
+ ((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 */
+ /* copy the whole packet into new pbufs */
+ q = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
+ if(q != NULL) {
+ if (pbuf_copy(q, p) != ERR_OK) {
+ pbuf_free(q);
+ q = NULL;
+ }
+ }
+
+ if(q != NULL) {
+ buf = memp_malloc(MEMP_NETBUF);
+ if (buf == NULL) {
+ pbuf_free(q);
+ return 0;
+ }
+
+ buf->p = q;
+ buf->ptr = q;
+ buf->addr = &(((struct ip_hdr*)(q->payload))->src);
+ buf->port = pcb->protocol;
+
+ SYS_ARCH_INC(conn->recv_avail, q->tot_len);
+ /* Register event with callback */
+ API_EVENT(conn, NETCONN_EVT_RCVPLUS, q->tot_len);
+ if (sys_mbox_trypost(conn->recvmbox, buf) != ERR_OK) {
+ netbuf_delete(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;
+#if LWIP_SO_RCVBUF
+ int recv_avail;
+#endif /* LWIP_SO_RCVBUF */
+
+ LWIP_UNUSED_ARG(pcb); /* only used for asserts... */
+ LWIP_ASSERT("recv_udp must have a pcb argument", pcb != NULL);
+ LWIP_ASSERT("recv_udp must have an argument", arg != NULL);
+ conn = arg;
+ LWIP_ASSERT("recv_udp: recv for wrong pcb!", conn->pcb.udp == pcb);
+
+#if LWIP_SO_RCVBUF
+ SYS_ARCH_GET(conn->recv_avail, recv_avail);
+ if ((conn == NULL) || (conn->recvmbox == SYS_MBOX_NULL) ||
+ ((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;
+ }
+
+ SYS_ARCH_INC(conn->recv_avail, p->tot_len);
+ /* Register event with callback */
+ API_EVENT(conn, NETCONN_EVT_RCVPLUS, p->tot_len);
+ if (sys_mbox_trypost(conn->recvmbox, buf) != ERR_OK) {
+ netbuf_delete(buf);
+ return;
+ }
+}
+#endif /* LWIP_UDP */
+
+#if LWIP_TCP
+/**
+ * Receive callback function for TCP netconns.
+ * Posts the packet to conn->recvmbox, but doesn't delete it on errors.
+ *
+ * @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);
+ LWIP_ASSERT("recv_tcp must have a pcb argument", pcb != NULL);
+ LWIP_ASSERT("recv_tcp must have an argument", arg != NULL);
+ conn = arg;
+ LWIP_ASSERT("recv_tcp: recv for wrong pcb!", conn->pcb.tcp == pcb);
+
+ if ((conn == NULL) || (conn->recvmbox == SYS_MBOX_NULL)) {
+ return ERR_VAL;
+ }
+
+ conn->err = err;
+ if (p != NULL) {
+ len = p->tot_len;
+ SYS_ARCH_INC(conn->recv_avail, len);
+ } else {
+ len = 0;
+ }
+ /* Register event with callback */
+ API_EVENT(conn, NETCONN_EVT_RCVPLUS, len);
+ if (sys_mbox_trypost(conn->recvmbox, p) != ERR_OK) {
+ return ERR_MEM;
+ }
+
+ 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->op_completed != SYS_SEM_NULL && conn->state == NETCONN_CONNECT) {
+ conn->state = NETCONN_NONE;
+ sys_sem_signal(conn->op_completed);
+ }
+ 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_sem_signal(conn->op_completed);
+ }
+}
+
+/**
+ * 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;);
+
+ /* We have to set the callback here even though
+ * the new socket is unknown. conn->socket is marked as -1. */
+ newconn = netconn_alloc(conn->type, conn->callback);
+ if (newconn == NULL) {
+ return ERR_MEM;
+ }
+ newconn->pcb.tcp = newpcb;
+ setup_tcp(newconn);
+ newconn->err = err;
+ /* Register event with callback */
+ API_EVENT(conn, NETCONN_EVT_RCVPLUS, 0);
+
+ if (sys_mbox_trypost(conn->acceptmbox, newconn) != ERR_OK) {
+ /* When returning != ERR_OK, the connection is aborted in tcp_process(),
+ so do nothing here! */
+ newconn->pcb.tcp = NULL;
+ netconn_free(newconn);
+ return ERR_MEM;
+ }
+ 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;
+
+ LWIP_ASSERT("pcb_new: pcb already allocated", msg->conn->pcb.tcp == NULL);
+
+ /* 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);
+}
+
+/**
+ * Create a new netconn (of a specific type) that has a callback function.
+ * The corresponding pcb is NOT created!
+ *
+ * @param t the type of 'connection' to create (@see enum netconn_type)
+ * @param proto the IP protocol for RAW IP pcbs
+ * @param callback a function to call on status changes (RX available, TX'ed)
+ * @return a newly allocated struct netconn or
+ * NULL on memory error
+ */
+struct netconn*
+netconn_alloc(enum netconn_type t, netconn_callback callback)
+{
+ struct netconn *conn;
+ int size;
+
+ conn = memp_malloc(MEMP_NETCONN);
+ if (conn == NULL) {
+ return NULL;
+ }
+
+ conn->err = ERR_OK;
+ conn->type = t;
+ conn->pcb.tcp = NULL;
+
+#if (DEFAULT_RAW_RECVMBOX_SIZE == DEFAULT_UDP_RECVMBOX_SIZE) && \
+ (DEFAULT_RAW_RECVMBOX_SIZE == DEFAULT_TCP_RECVMBOX_SIZE)
+ size = DEFAULT_RAW_RECVMBOX_SIZE;
+#else
+ switch(NETCONNTYPE_GROUP(t)) {
+#if LWIP_RAW
+ case NETCONN_RAW:
+ size = DEFAULT_RAW_RECVMBOX_SIZE;
+ break;
+#endif /* LWIP_RAW */
+#if LWIP_UDP
+ case NETCONN_UDP:
+ size = DEFAULT_UDP_RECVMBOX_SIZE;
+ break;
+#endif /* LWIP_UDP */
+#if LWIP_TCP
+ case NETCONN_TCP:
+ size = DEFAULT_TCP_RECVMBOX_SIZE;
+ break;
+#endif /* LWIP_TCP */
+ default:
+ LWIP_ASSERT("netconn_alloc: undefined netconn_type", 0);
+ break;
+ }
+#endif
+
+ if ((conn->op_completed = sys_sem_new(0)) == SYS_SEM_NULL) {
+ memp_free(MEMP_NETCONN, conn);
+ return NULL;
+ }
+ if ((conn->recvmbox = sys_mbox_new(size)) == SYS_MBOX_NULL) {
+ sys_sem_free(conn->op_completed);
+ memp_free(MEMP_NETCONN, conn);
+ return NULL;
+ }
+
+ conn->acceptmbox = SYS_MBOX_NULL;
+ conn->state = NETCONN_NONE;
+ /* initialize socket to -1 since 0 is a valid socket */
+ conn->socket = -1;
+ conn->callback = callback;
+ conn->recv_avail = 0;
+#if LWIP_SO_RCVTIMEO
+ conn->recv_timeout = 0;
+#endif /* LWIP_SO_RCVTIMEO */
+#if LWIP_SO_RCVBUF
+ conn->recv_bufsize = INT_MAX;
+#endif /* LWIP_SO_RCVBUF */
+ return conn;
+}
+
+/**
+ * Delete a netconn and all its resources.
+ * The pcb is NOT freed (since we might not be in the right thread context do this).
+ *
+ * @param conn the netconn to free
+ */
+void
+netconn_free(struct netconn *conn)
+{
+ void *mem;
+ LWIP_ASSERT("PCB must be deallocated outside this function", conn->pcb.tcp == NULL);
+
+ /* Drain the recvmbox. */
+ if (conn->recvmbox != SYS_MBOX_NULL) {
+ while (sys_mbox_tryfetch(conn->recvmbox, &mem) != SYS_MBOX_EMPTY) {
+ if (conn->type == NETCONN_TCP) {
+ if(mem != NULL) {
+ pbuf_free((struct pbuf *)mem);
+ }
+ } else {
+ netbuf_delete((struct netbuf *)mem);
+ }
+ }
+ sys_mbox_free(conn->recvmbox);
+ conn->recvmbox = SYS_MBOX_NULL;
+ }
+
+ /* Drain the acceptmbox. */
+ if (conn->acceptmbox != SYS_MBOX_NULL) {
+ while (sys_mbox_tryfetch(conn->acceptmbox, &mem) != SYS_MBOX_EMPTY) {
+ netconn_delete((struct netconn *)mem);
+ }
+ sys_mbox_free(conn->acceptmbox);
+ conn->acceptmbox = SYS_MBOX_NULL;
+ }
+
+ sys_sem_free(conn->op_completed);
+ conn->op_completed = SYS_SEM_NULL;
+
+ memp_free(MEMP_NETCONN, conn);
+}
+
+#if LWIP_TCP
+/**
+ * Internal helper function to close a TCP netconn: since this sometimes
+ * doesn't work at the first attempt, this function is called from multiple
+ * places.
+ *
+ * @param conn the TCP netconn to close
+ */
+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_sem_signal(conn->op_completed);
+ }
+ /* 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->op_completed != SYS_SEM_NULL) {
+ sys_sem_signal(msg->conn->op_completed);
+ }
+}
+
+/**
+ * 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 (!ERR_IS_FATAL(msg->conn->err)) {
+ 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_sem_signal(conn->op_completed);
+ 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_sem_signal(msg->conn->op_completed);
+ 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_sem_signal(msg->conn->op_completed);
+ 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_sem_signal(msg->conn->op_completed);
+ 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_sem_signal() 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 (!ERR_IS_FATAL(msg->conn->err)) {
+ if (msg->conn->pcb.tcp != NULL) {
+ if (msg->conn->type == NETCONN_TCP) {
+ if (msg->conn->pcb.tcp->state == CLOSED) {
+#if TCP_LISTEN_BACKLOG
+ struct tcp_pcb* lpcb = tcp_listen_with_backlog(msg->conn->pcb.tcp, msg->msg.lb.backlog);
+#else /* TCP_LISTEN_BACKLOG */
+ struct tcp_pcb* lpcb = tcp_listen(msg->conn->pcb.tcp);
+#endif /* TCP_LISTEN_BACKLOG */
+ if (lpcb == NULL) {
+ msg->conn->err = ERR_MEM;
+ } else {
+ /* delete the recvmbox and allocate the acceptmbox */
+ if (msg->conn->recvmbox != SYS_MBOX_NULL) {
+ /** @todo: should we drain the recvmbox here? */
+ sys_mbox_free(msg->conn->recvmbox);
+ msg->conn->recvmbox = SYS_MBOX_NULL;
+ }
+ if (msg->conn->acceptmbox == SYS_MBOX_NULL) {
+ if ((msg->conn->acceptmbox = sys_mbox_new(DEFAULT_ACCEPTMBOX_SIZE)) == 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 (!ERR_IS_FATAL(msg->conn->err)) {
+ 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 (!ERR_IS_FATAL(msg->conn->err)) {
+ if (msg->conn->pcb.tcp != NULL) {
+ if (msg->conn->type == NETCONN_TCP) {
+#if TCP_LISTEN_BACKLOG
+ if (msg->conn->pcb.tcp->state == LISTEN) {
+ tcp_accepted(msg->conn->pcb.tcp);
+ } else
+#endif /* TCP_LISTEN_BACKLOG */
+ {
+ 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
+ */
+static 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 ERR_MEM, we wait for sent_tcp or poll_tcp to be called
+ we do NOT return to the application thread, since ERR_MEM is
+ only a temporary error! */
+
+ /* tcp_enqueue returned ERR_MEM, try tcp_output anyway */
+ err = tcp_output(conn->pcb.tcp);
+
+#if LWIP_TCPIP_CORE_LOCKING
+ conn->write_delayed = 1;
+#endif
+ } else {
+ /* On errors != ERR_MEM, we don't try writing any more but return
+ the error to the application thread. */
+ conn->err = err;
+ 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_sem_signal(conn->op_completed);
+ }
+ }
+#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 (!ERR_IS_FATAL(msg->conn->err)) {
+ 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_sem_wait(msg->conn->op_completed, 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);
+}
+
+/**
+ * Return a connection's local or remote address
+ * Called from netconn_getaddr
+ *
+ * @param msg the api_msg_msg pointing to the connection
+ */
+void
+do_getaddr(struct api_msg_msg *msg)
+{
+ if (msg->conn->pcb.ip != NULL) {
+ *(msg->msg.ad.ipaddr) = (msg->msg.ad.local?msg->conn->pcb.ip->local_ip:msg->conn->pcb.ip->remote_ip);
+
+ switch (NETCONNTYPE_GROUP(msg->conn->type)) {
+#if LWIP_RAW
+ case NETCONN_RAW:
+ if (msg->msg.ad.local) {
+ *(msg->msg.ad.port) = msg->conn->pcb.raw->protocol;
+ } else {
+ /* return an error as connecting is only a helper for upper layers */
+ msg->conn->err = ERR_CONN;
+ }
+ break;
+#endif /* LWIP_RAW */
+#if LWIP_UDP
+ case NETCONN_UDP:
+ if (msg->msg.ad.local) {
+ *(msg->msg.ad.port) = msg->conn->pcb.udp->local_port;
+ } else {
+ if ((msg->conn->pcb.udp->flags & UDP_FLAGS_CONNECTED) == 0) {
+ msg->conn->err = ERR_CONN;
+ } else {
+ *(msg->msg.ad.port) = msg->conn->pcb.udp->remote_port;
+ }
+ }
+ break;
+#endif /* LWIP_UDP */
+#if LWIP_TCP
+ case NETCONN_TCP:
+ *(msg->msg.ad.port) = (msg->msg.ad.local?msg->conn->pcb.tcp->local_port:msg->conn->pcb.tcp->remote_port);
+ break;
+#endif /* LWIP_TCP */
+ }
+ } else {
+ msg->conn->err = ERR_CONN;
+ }
+ 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 (!ERR_IS_FATAL(msg->conn->err)) {
+ 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 */
+
+#if LWIP_DNS
+/**
+ * Callback function that is called when DNS name is resolved
+ * (or on timeout). A waiting application thread is waked up by
+ * signaling the semaphore.
+ */
+static void
+do_dns_found(const char *name, struct ip_addr *ipaddr, void *arg)
+{
+ struct dns_api_msg *msg = (struct dns_api_msg*)arg;
+
+ LWIP_ASSERT("DNS response for wrong host name", strcmp(msg->name, name) == 0);
+
+ if (ipaddr == NULL) {
+ /* timeout or memory error */
+ *msg->err = ERR_VAL;
+ } else {
+ /* address was resolved */
+ *msg->err = ERR_OK;
+ *msg->addr = *ipaddr;
+ }
+ /* wake up the application task waiting in netconn_gethostbyname */
+ sys_sem_signal(msg->sem);
+}
+
+/**
+ * Execute a DNS query
+ * Called from netconn_gethostbyname
+ *
+ * @param arg the dns_api_msg pointing to the query
+ */
+void
+do_gethostbyname(void *arg)
+{
+ struct dns_api_msg *msg = (struct dns_api_msg*)arg;
+
+ *msg->err = dns_gethostbyname(msg->name, msg->addr, do_dns_found, msg);
+ if (*msg->err != ERR_INPROGRESS) {
+ /* on error or immediate success, wake up the application
+ * task waiting in netconn_gethostbyname */
+ sys_sem_signal(msg->sem);
+ }
+}
+#endif /* LWIP_DNS */
+
+#endif /* LWIP_NETCONN */
