contiki/core/dev/cc2420_send_ip.c

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#include <stdio.h>
#include "contiki.h"
#include "net/uip.h"
#include "net/uip-fw.h"
#define BUF ((struct uip_tcpip_hdr *)&uip_buf[UIP_LLH_LEN])
#include "dev/leds.h"
#include "dev/cc2420.h"
#define in_my_network(a) \
(((a[0] ^ cc2420if.ipaddr.u16[0]) & cc2420if.netmask.u16[0]) == 0 && \
((a[1] ^ cc2420if.ipaddr.u16[1]) & cc2420if.netmask.u16[1]) == 0)
u8_t
cc2420_send_ip(void)
{
int ret;
struct hdr_802_15 h;
u8_t color = (cc2420_ack_received) ? LEDS_BLUE : LEDS_RED;
leds_toggle(color);
h.len = MAC_HDR_LEN + uip_len + 2; /* Including footer[2]. */
h.fc0 = FC0_TYPE_DATA | FC0_REQ_ACK | FC0_INTRA_PAN;
h.fc1 = FC1_DST_16 | FC1_SRC_16;
h.src = uip_hostaddr.u16[1];
if (uip_ipaddr_cmp(&BUF->destipaddr, &uip_broadcast_addr))
h.dst = 0xffff;
else {
uip_ipaddr_t *next_gw;
if (in_my_network(BUF->destipaddr.u16))
next_gw = &BUF->destipaddr;
else
next_gw = &uip_draddr; /* Default router. */
if (cc2420_check_remote(next_gw->u16[1]) == REMOTE_YES)
h.dst = 0xffff; /* remote, use bcast */
else
h.dst = next_gw->u16[1]; /* local or unknown, use ucast */
}
/* Don't request MAC level ACKs for broadcast packets. */
if (h.dst == 0xffff)
h.fc0 &= ~FC0_REQ_ACK;
ret = cc2420_send(&h, 10, &uip_buf[UIP_LLH_LEN], uip_len);
if (ret < 0) {
printf("cc2420_send_ip failed uip_len=%d ret=%d\n", uip_len, ret);
leds_toggle(color);
return UIP_FW_TOOLARGE;
}
leds_toggle(color);
return UIP_FW_OK;
}