blob: 68f4dcb83a538c69e51f6cde9398b0eb099ba955 [file] [log] [blame]
/*
* Copyright (c) 2014 Chris Anderson
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files
* (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge,
* publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "minip-internal.h"
/* XXX alternate implementation, merge */
uint16_t ones_sum16(uint32_t sum, const void *_buf, int len)
{
const uint16_t *buf = _buf;
while (len >= 2) {
sum += *buf++;
if(sum & 0x80000000)
sum = (sum & 0xffff) + (sum >> 16);
len -= 2;
}
if (len) {
uint16_t temp = htons((*(uint8_t *)buf) << 8);
sum += temp;
}
while (sum >> 16)
sum = (sum & 0xffff) + (sum >> 16);
return sum;
}
uint16_t rfc1701_chksum(const uint8_t *buf, size_t len)
{
uint32_t total = 0;
uint16_t chksum = 0;
const uint16_t *p = (const uint16_t *) buf;
// Length is in bytes
for (size_t i = 0; i < len / 2; i++ ) {
total += p[i];
}
chksum = (total & 0xFFFF) + (total >> 16);
chksum = ~chksum;
return chksum;
}
#if MINIP_USE_UDP_CHECKSUM
uint16_t rfc768_chksum(struct ipv4_hdr *ipv4, struct udp_hdr *udp)
{
uint32_t total = 0;
uint16_t chksum = 0;
size_t len = ntohs(udp->len);
uint16_t *p;
p = (uint16_t *)ipv4->src_addr;
total += htons(p[0]);
total += htons(p[1]);
p = (uint16_t *)ipv4->dst_addr;
total += htons(p[0]);
total += htons(p[1]);
p = (const uint16_t *)udp->data;
for (size_t i = 0; i < len / 2; i++ ) {
total += p[i];
}
total += IP_PROTO_UDP;
total += udp->len;
total += udp->src_port;
total += udp->dst_port;
total += ipv4->len;
chksum = (total & 0xFFFF) + (total >> 16);
chksum = ~chksum;
return chksum;
}
#endif
// vim: set ts=4 sw=4 expandtab: