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Basic, functional-but-extremely-pessimal versions (taken from
uip-0.9/unix/uip_arch.c).
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src/proto/uip/uip_arch.c
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83
src/proto/uip/uip_arch.c
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#include <stdint.h>
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#include <byteswap.h>
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#include "uip_arch.h"
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#include "uip.h"
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volatile u8_t uip_acc32[4];
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void uip_add32 ( u8_t *op32, u16_t op16 ) {
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* ( ( uint32_t * ) uip_acc32 ) =
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htonl ( ntohl ( *( ( uint32_t * ) op32 ) ) + op16 );
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}
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#define BUF ((uip_tcpip_hdr *)&uip_buf[UIP_LLH_LEN])
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#define IP_PROTO_TCP 6
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u16_t uip_chksum(u16_t *sdata, u16_t len) {
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u16_t acc;
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for(acc = 0; len > 1; len -= 2) {
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acc += *sdata;
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if(acc < *sdata) {
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/* Overflow, so we add the carry to acc (i.e., increase by
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one). */
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++acc;
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}
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++sdata;
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}
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/* add up any odd byte */
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if(len == 1) {
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acc += htons(((u16_t)(*(u8_t *)sdata)) << 8);
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if(acc < htons(((u16_t)(*(u8_t *)sdata)) << 8)) {
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++acc;
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}
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}
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return acc;
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}
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u16_t uip_ipchksum(void) {
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return uip_chksum((u16_t *)&uip_buf[UIP_LLH_LEN], 20);
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}
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u16_t uip_tcpchksum(void) {
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u16_t hsum, sum;
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/* Compute the checksum of the TCP header. */
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hsum = uip_chksum((u16_t *)&uip_buf[20 + UIP_LLH_LEN], 20);
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/* Compute the checksum of the data in the TCP packet and add it to
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the TCP header checksum. */
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sum = uip_chksum((u16_t *)uip_appdata,
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(u16_t)(((((u16_t)(BUF->len[0]) << 8) + BUF->len[1]) - 40)));
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if((sum += hsum) < hsum) {
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++sum;
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}
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if((sum += BUF->srcipaddr[0]) < BUF->srcipaddr[0]) {
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++sum;
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}
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if((sum += BUF->srcipaddr[1]) < BUF->srcipaddr[1]) {
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++sum;
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}
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if((sum += BUF->destipaddr[0]) < BUF->destipaddr[0]) {
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++sum;
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}
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if((sum += BUF->destipaddr[1]) < BUF->destipaddr[1]) {
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++sum;
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}
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if((sum += (u16_t)htons((u16_t)IP_PROTO_TCP)) < (u16_t)htons((u16_t)IP_PROTO_TCP)) {
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++sum;
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}
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hsum = (u16_t)htons((((u16_t)(BUF->len[0]) << 8) + BUF->len[1]) - 20);
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if((sum += hsum) < hsum) {
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++sum;
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}
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return sum;
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}
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