76 lines
1.7 KiB
C
76 lines
1.7 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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#define UIP_CONF_IPV6 1
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#include "net/uip.h"
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#include <stdio.h>
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#include <arpa/inet.h>
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#undef uip_buf
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unsigned char *uip_buf;
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uint16_t uip_len;
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#define UIP_IP_BUF ((struct uip_ip_hdr *)&uip_buf[UIP_LLH_LEN])
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static uint16_t
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chksum(uint16_t sum, const uint8_t *data, uint16_t len)
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{
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uint16_t t;
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const uint8_t *dataptr;
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const uint8_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 uint16_t
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upper_layer_chksum(uint8_t proto)
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{
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uint16_t upper_layer_len;
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uint16_t sum;
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upper_layer_len = (((uint16_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, (uint8_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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uint16_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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