
/* 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 */


#include "net/uip.h"
#include "net/uip-ds6.h"
#include <string.h>

#define UIP_IP_BUF   ((struct uip_ip_hdr *)&uip_buf[UIP_LLH_LEN])

uip_buf_t uip_aligned_buf;

uint16_t uip_len;

struct uip_stats uip_stat;

uip_lladdr_t uip_lladdr;

uint16_t htons(uint16_t val) { return UIP_HTONS(val);}

uip_ds6_netif_t uip_ds6_if;

/********** UIP_DS6.c **********/

void
uip_ds6_set_addr_iid(uip_ipaddr_t *ipaddr, uip_lladdr_t *lladdr)
{
  /* We consider only links with IEEE EUI-64 identifier or
     IEEE 48-bit MAC addresses */
#if (UIP_LLADDR_LEN == 8)
  memcpy(ipaddr->u8 + 8, lladdr, UIP_LLADDR_LEN);
  ipaddr->u8[8] ^= 0x02;
#elif (UIP_LLADDR_LEN == 6)
  memcpy(ipaddr->u8 + 8, lladdr, 3);
  ipaddr->u8[11] = 0xff;
  ipaddr->u8[12] = 0xfe;
  memcpy(ipaddr->u8 + 13, lladdr + 3, 3);
  ipaddr->u8[8] ^= 0x02;
#else
#error fakeuip.c cannot build interface address when UIP_LLADDR_LEN is not 6 or 8
#endif
}

/*---------------------------------------------------------------------------*/
/*
 * get a link local address -
 * state = -1 => any address is ok. Otherwise state = desired state of addr.
 * (TENTATIVE, PREFERRED, DEPRECATED)
 */
uip_ds6_addr_t *
uip_ds6_get_link_local(int8_t state) {
  uip_ds6_addr_t *locaddr;
  for(locaddr = uip_ds6_if.addr_list;
      locaddr < uip_ds6_if.addr_list + UIP_DS6_ADDR_NB; locaddr++) {
    if((locaddr->isused) && (state == - 1 || locaddr->state == state)
       && (uip_is_addr_link_local(&locaddr->ipaddr))) {
      return locaddr;
    }
  }
  return NULL;
}

uip_ds6_addr_t *
uip_ds6_addr_add(uip_ipaddr_t *ipaddr, unsigned long vlifetime, uint8_t type)
{
  return NULL;
}
/********** UIP.c ****************/

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);
}
