nes-proj/tools/stm32w/wpcapslip6/fakeuip.c

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/* Various stub functions and uIP variables other code might need to
* compile. Allows you to save needing to compile all of uIP in just
* to get a few things */
#define UIP_CONF_IPV6 1
#include "net/uip.h"
#include <stdio.h>
#include <arpa/inet.h>
#undef uip_buf
unsigned char *uip_buf;
uint16_t uip_len;
#define UIP_IP_BUF ((struct uip_ip_hdr *)&uip_buf[UIP_LLH_LEN])
static uint16_t
chksum(uint16_t sum, const uint8_t *data, uint16_t len)
{
uint16_t t;
const uint8_t *dataptr;
const uint8_t *last_byte;
dataptr = data;
last_byte = data + len - 1;
while(dataptr < last_byte) { /* At least two more bytes */
t = (dataptr[0] << 8) + dataptr[1];
sum += t;
if(sum < t) {
sum++; /* carry */
}
dataptr += 2;
}
if(dataptr == last_byte) {
t = (dataptr[0] << 8) + 0;
sum += t;
if(sum < t) {
sum++; /* carry */
}
}
/* Return sum in host byte order. */
return sum;
}
static uint16_t
upper_layer_chksum(uint8_t proto)
{
uint16_t upper_layer_len;
uint16_t sum;
upper_layer_len = (((uint16_t)(UIP_IP_BUF->len[0]) << 8) + UIP_IP_BUF->len[1]) ;
/* First sum pseudoheader. */
/* IP protocol and length fields. This addition cannot carry. */
sum = upper_layer_len + proto;
/* Sum IP source and destination addresses. */
sum = chksum(sum, (uint8_t *)&UIP_IP_BUF->srcipaddr, 2 * sizeof(uip_ipaddr_t));
/* Sum TCP header and data. */
sum = chksum(sum, &uip_buf[UIP_IPH_LEN + UIP_LLH_LEN],
upper_layer_len);
return (sum == 0) ? 0xffff : htons(sum);
}
/*---------------------------------------------------------------------------*/
uint16_t
uip_icmp6chksum(void)
{
return upper_layer_chksum(UIP_PROTO_ICMP6);
}