lib/checksum.h

   1 #include <stdint.h>
   2 #include <netinet/in.h>
   3
   4 #ifdef __cplusplus
   5 extern "C" {
   6 #endif
   7
   8
   9 /* IPv4 pseudoheader */
  10 struct ipv4_ph {
  11         struct in_addr src;
  12         struct in_addr dst;
  13         uint8_t rsvd;
  14         uint8_t proto;
  15         uint16_t len;
  16 } __attribute__((packed));
  17
  18 /* IPv6 pseudoheader */
  19 struct ipv6_ph {
  20         struct in6_addr src;
  21         struct in6_addr dst;
  22         uint32_t ulpl;
  23         uint8_t zero[3];
  24         uint8_t next_hdr;
  25 } __attribute__((packed));
  26
  27 extern int in_cksum(void *data, int nbytes);
  28 extern int in_cksum_with_ph4(struct ipv4_ph *ph, void *data, int nbytes);
  29 extern int in_cksum_with_ph6(struct ipv6_ph *ph, void *data, int nbytes);
  30
  31 #define FLETCHER_CHECKSUM_VALIDATE 0xffff
  32 extern uint16_t fletcher_checksum(uint8_t *, const size_t len,
  33                                   const uint16_t offset);
  34
  35 #ifdef __cplusplus
  36 }
  37 #endif