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/*
* Copyright (c) 2016 Intel Corporation
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <string.h>
#include <errno.h>
#include <misc/printk.h>
#include "tcp_cfg.h"
#include "tcp.h"
#include <net/net_core.h>
#include <net/net_context.h>
#include <net/nbuf.h>
#include <net/net_if.h>
#if !defined(CONFIG_MBEDTLS_CFG_FILE)
#include "mbedtls/config.h"
#else
#include CONFIG_MBEDTLS_CFG_FILE
#endif
#include "mbedtls/ssl.h"
#define CLIENT_IP_ADDR { { { CLIENT_IPADDR0, CLIENT_IPADDR1, \
CLIENT_IPADDR2, CLIENT_IPADDR3 } } }
#define SERVER_IP_ADDR { { { SERVER_IPADDR0, SERVER_IPADDR1, \
SERVER_IPADDR2, SERVER_IPADDR3 } } }
#define INET_FAMILY AF_INET
static struct in_addr client_addr = CLIENT_IP_ADDR;
static struct in_addr server_addr = SERVER_IP_ADDR;
static void tcp_received(struct net_context *context,
struct net_buf *buf, int status, void *user_data)
{
ARG_UNUSED(context);
struct tcp_context *ctx = user_data;
ctx->rx_nbuf = buf;
}
int tcp_tx(void *context, const unsigned char *buf, size_t size)
{
struct tcp_context *ctx = context;
struct net_context *tcp_ctx;
struct net_buf *send_buf;
struct sockaddr_in dst_addr;
int rc, len;
tcp_ctx = ctx->net_ctx;
send_buf = net_nbuf_get_tx(tcp_ctx, K_FOREVER);
if (!send_buf) {
printk("cannot create buf\n");
return -EIO;
}
rc = net_nbuf_append(send_buf, size, (uint8_t *) buf, K_FOREVER);
if (!rc) {
printk("cannot write buf\n");
return -EIO;
}
net_ipaddr_copy(&dst_addr.sin_addr, &server_addr);
dst_addr.sin_family = AF_INET;
dst_addr.sin_port = htons(SERVER_PORT);
len = net_buf_frags_len(send_buf);
k_sleep(TCP_TX_TIMEOUT);
rc = net_context_sendto(send_buf, (struct sockaddr *)&dst_addr,
sizeof(struct sockaddr_in),
NULL, K_FOREVER, NULL, NULL);
if (rc < 0) {
printk("Cannot send IPv4 data to peer (%d)\n", rc);
net_nbuf_unref(send_buf);
return -EIO;
} else {
return len;
}
}
int tcp_rx(void *context, unsigned char *buf, size_t size)
{
struct tcp_context *ctx = context;
uint8_t *ptr;
int pos = 0;
int len;
struct net_buf *rx_buf;
int rc, read_bytes;
rc = net_context_recv(ctx->net_ctx, tcp_received, K_FOREVER, ctx);
if (rc != 0) {
return 0;
}
read_bytes = net_nbuf_appdatalen(ctx->rx_nbuf);
ptr = net_nbuf_appdata(ctx->rx_nbuf);
rx_buf = ctx->rx_nbuf->frags;
len = rx_buf->len - (ptr - rx_buf->data);
while (rx_buf) {
memcpy(buf + pos, ptr, len);
pos += len;
rx_buf = rx_buf->frags;
if (!rx_buf) {
break;
}
ptr = rx_buf->data;
len = rx_buf->len;
}
if (read_bytes != pos) {
return -EIO;
}
rc = read_bytes;
net_nbuf_unref(ctx->rx_nbuf);
ctx->remaining = 0;
ctx->rx_nbuf = NULL;
return rc;
}
int tcp_init(struct tcp_context *ctx)
{
struct net_context *tcp_ctx = { 0 };
struct sockaddr_in my_addr4 = { 0 };
int rc;
net_ipaddr_copy(&my_addr4.sin_addr, &client_addr);
my_addr4.sin_family = AF_INET;
my_addr4.sin_port = htons(CLIENT_PORT);
rc = net_context_get(AF_INET, SOCK_DGRAM, IPPROTO_TCP, &tcp_ctx);
if (rc < 0) {
printk("Cannot get network context for IPv4 TCP (%d)", rc);
return -EIO;
}
rc = net_context_bind(tcp_ctx, (struct sockaddr *)&my_addr4,
sizeof(struct sockaddr_in));
if (rc < 0) {
printk("Cannot bind IPv4 TCP port %d (%d)", CLIENT_PORT, rc);
goto error;
}
ctx->rx_nbuf = NULL;
ctx->remaining = 0;
ctx->net_ctx = tcp_ctx;
return 0;
error:
net_context_put(tcp_ctx);
return -EINVAL;
}
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