#include <agnix/agnix.h>#include <agnix/net/net.h>Include dependency graph for ip_checksum.c:
Go to the source code of this file.
Functions | |
| u16 | ip_checksum (struct ip_hdr_s *ip) |
|
|
Definition at line 17 of file ip_checksum.c. Referenced by ip_recv(). 00018 {
00019 u32 sum;
00020 u16 word;
00021 u16 *ptr;
00022 int len;
00023
00024 ptr = (u16 *)ip;
00025
00026 sum = 0;
00027 for (len = sizeof(struct ip_hdr_s); len > 1; len -= 2, ptr++) {
00028 sum += *ptr;
00029 }
00030
00031 if (len == 1) {
00032 word = 0;
00033 *((u8 *) &word) = *(u8 *)ptr;
00034 sum += word;
00035 }
00036
00037 sum = (sum >> 16) + (sum & 0xffff);
00038 sum += (sum >> 16);
00039
00040 return (u16)(~sum);
00041 };
|