mirror of
https://github.com/oliverschmidt/contiki.git
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121 lines
2.6 KiB
C
121 lines
2.6 KiB
C
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/* Various stub functions and uIP variables other code might need to
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* compile. Allows you to save needing to compile all of uIP in just
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* to get a few things */
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#include "uip.h"
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#include <string.h>
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#define UIP_IP_BUF ((struct uip_ip_hdr *)&uip_buf[UIP_LLH_LEN])
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u8_t uip_buf[UIP_BUFSIZE + 2];
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u16_t uip_len;
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struct uip_stats uip_stat;
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uip_lladdr_t uip_lladdr;
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static u8_t (* output)(uip_lladdr_t *);
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u8_t tcpip_output(uip_lladdr_t * lladdr){
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if(output != NULL) {
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return output(lladdr);
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}
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return 0;
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}
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void tcpip_set_outputfunc(u8_t (* f)(uip_lladdr_t *)) {
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output = f;
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}
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u16_t htons(u16_t val) { return HTONS(val);}
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/********** UIP_NETIF.c **********/
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void
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uip_netif_addr_autoconf_set(uip_ipaddr_t *ipaddr, uip_lladdr_t *lladdr)
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{
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/* We consider only links with IEEE EUI-64 identifier or
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IEEE 48-bit MAC addresses */
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#if (UIP_LLADDR_LEN == 8)
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memcpy(ipaddr->u8 + 8, lladdr, UIP_LLADDR_LEN);
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ipaddr->u8[8] ^= 0x02;
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#elif (UIP_LLADDR_LEN == 6)
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memcpy(ipaddr->u8 + 8, lladdr, 3);
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ipaddr->u8[11] = 0xff;
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ipaddr->u8[12] = 0xfe;
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memcpy(ipaddr->u8 + 13, lladdr + 3, 3);
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ipaddr->u8[8] ^= 0x02;
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#else
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/*
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UIP_LOG("CAN NOT BUIL INTERFACE IDENTIFIER");
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UIP_LOG("THE STACK IS GOING TO SHUT DOWN");
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UIP_LOG("THE HOST WILL BE UNREACHABLE");
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*/
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exit(-1);
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#endif
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}
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/********** UIP.c ****************/
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static u16_t
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chksum(u16_t sum, const u8_t *data, u16_t len)
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{
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u16_t t;
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const u8_t *dataptr;
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const u8_t *last_byte;
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dataptr = data;
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last_byte = data + len - 1;
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while(dataptr < last_byte) { /* At least two more bytes */
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t = (dataptr[0] << 8) + dataptr[1];
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sum += t;
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if(sum < t) {
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sum++; /* carry */
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}
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dataptr += 2;
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}
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if(dataptr == last_byte) {
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t = (dataptr[0] << 8) + 0;
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sum += t;
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if(sum < t) {
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sum++; /* carry */
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}
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}
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/* Return sum in host byte order. */
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return sum;
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}
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static u16_t
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upper_layer_chksum(u8_t proto)
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{
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u16_t upper_layer_len;
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u16_t sum;
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upper_layer_len = (((u16_t)(UIP_IP_BUF->len[0]) << 8) + UIP_IP_BUF->len[1]) ;
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/* First sum pseudoheader. */
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/* IP protocol and length fields. This addition cannot carry. */
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sum = upper_layer_len + proto;
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/* Sum IP source and destination addresses. */
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sum = chksum(sum, (u8_t *)&UIP_IP_BUF->srcipaddr, 2 * sizeof(uip_ipaddr_t));
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/* Sum TCP header and data. */
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sum = chksum(sum, &uip_buf[UIP_IPH_LEN + UIP_LLH_LEN],
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upper_layer_len);
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return (sum == 0) ? 0xffff : htons(sum);
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}
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/*---------------------------------------------------------------------------*/
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u16_t
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uip_icmp6chksum(void)
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{
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return upper_layer_chksum(UIP_PROTO_ICMP6);
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}
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