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/*
* Copyright (c) 2017 Intel Corporation
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <zephyr.h>
#include <net/net_core.h>
#include <net/net_context.h>
#include <net/nbuf.h>
#include <net/net_if.h>
#include <string.h>
#include <errno.h>
#include <misc/printk.h>
#include "udp_cfg.h"
#include "udp.h"
static const socklen_t addrlen = sizeof(struct sockaddr_in6);
static void set_client_address(struct sockaddr *addr, struct net_buf *rx_buf)
{
net_ipaddr_copy(&net_sin6(addr)->sin6_addr, &NET_IPV6_BUF(rx_buf)->src);
net_sin6(addr)->sin6_family = AF_INET6;
net_sin6(addr)->sin6_port = NET_UDP_BUF(rx_buf)->src_port;
}
static void udp_received(struct net_context *context,
struct net_buf *buf, int status, void *user_data)
{
struct udp_context *ctx = user_data;
ARG_UNUSED(context);
ARG_UNUSED(status);
ctx->rx_nbuf = buf;
k_sem_give(&ctx->rx_sem);
}
int udp_tx(void *context, const unsigned char *buf, size_t size)
{
struct udp_context *ctx = context;
struct net_context *net_ctx;
struct net_buf *send_buf;
int rc, len;
net_ctx = ctx->net_ctx;
send_buf = net_nbuf_get_tx(net_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;
}
len = net_buf_frags_len(send_buf);
rc = net_context_sendto(send_buf, &net_ctx->remote,
addrlen, NULL, K_FOREVER, NULL, NULL);
if (rc < 0) {
printk("Cannot send data to peer (%d)\n", rc);
net_nbuf_unref(send_buf);
return -EIO;
} else {
return len;
}
}
int udp_rx(void *context, unsigned char *buf, size_t size)
{
struct udp_context *ctx = context;
struct net_context *net_ctx = ctx->net_ctx;
struct net_buf *rx_buf = NULL;
uint16_t read_bytes;
uint8_t *ptr;
int pos;
int len;
int rc;
k_sem_take(&ctx->rx_sem, K_FOREVER);
read_bytes = net_nbuf_appdatalen(ctx->rx_nbuf);
if (read_bytes > size) {
return -ENOMEM;
}
rx_buf = ctx->rx_nbuf;
set_client_address(&net_ctx->remote, rx_buf);
ptr = net_nbuf_appdata(rx_buf);
rx_buf = rx_buf->frags;
len = rx_buf->len - (ptr - rx_buf->data);
pos = 0;
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;
}
net_nbuf_unref(ctx->rx_nbuf);
ctx->rx_nbuf = NULL;
if (read_bytes != pos) {
return -EIO;
}
rc = read_bytes;
ctx->remaining = 0;
return rc;
}
int udp_init(struct udp_context *ctx)
{
struct net_context *udp_ctx = { 0 };
struct net_context *mcast_ctx = { 0 };
struct sockaddr_in6 my_addr = { 0 };
struct sockaddr_in6 my_mcast_addr = { 0 };
int rc;
k_sem_init(&ctx->rx_sem, 0, UINT_MAX);
net_ipaddr_copy(&my_mcast_addr.sin6_addr, &mcast_addr);
my_mcast_addr.sin6_family = AF_INET6;
net_ipaddr_copy(&my_addr.sin6_addr, &server_addr);
my_addr.sin6_family = AF_INET6;
my_addr.sin6_port = htons(SERVER_PORT);
rc = net_context_get(AF_INET6, SOCK_DGRAM, IPPROTO_UDP, &udp_ctx);
if (rc < 0) {
printk("Cannot get network context for IPv6 UDP (%d)", rc);
return -EIO;
}
rc = net_context_bind(udp_ctx, (struct sockaddr *)&my_addr,
sizeof(struct sockaddr_in6));
if (rc < 0) {
printk("Cannot bind IPv6 UDP port %d (%d)", SERVER_PORT, rc);
goto error;
}
rc = net_context_get(AF_INET6, SOCK_DGRAM, IPPROTO_UDP, &mcast_ctx);
if (rc < 0) {
printk("Cannot get receiving IPv6 mcast (%d)", rc);
goto error;
}
rc = net_context_bind(mcast_ctx, (struct sockaddr *)&my_mcast_addr,
sizeof(struct sockaddr_in6));
if (rc < 0) {
printk("Cannot get bind IPv6 mcast (%d)", rc);
goto error;
}
ctx->rx_nbuf = NULL;
ctx->remaining = 0;
ctx->net_ctx = udp_ctx;
rc = net_context_recv(ctx->net_ctx, udp_received, K_NO_WAIT, ctx);
if (rc != 0) {
return -EIO;
}
return 0;
error:
net_context_put(udp_ctx);
return -EINVAL;
}
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