lib/checksum.h

   1 #ifndef _FRR_CHECKSUM_H
   2 #define _FRR_CHECKSUM_H
   3
   4 #include <stdint.h>
   5 #include <netinet/in.h>
   6
   7 #ifdef __cplusplus
   8 extern "C" {
   9 #endif
  10
  11
  12 /* IPv4 pseudoheader */
  13 struct ipv4_ph {
  14         struct in_addr src;
  15         struct in_addr dst;
  16         uint8_t rsvd;
  17         uint8_t proto;
  18         uint16_t len;
  19 } __attribute__((packed));
  20
  21 /* IPv6 pseudoheader */
  22 struct ipv6_ph {
  23         struct in6_addr src;
  24         struct in6_addr dst;
  25         uint32_t ulpl;
  26         uint8_t zero[3];
  27         uint8_t next_hdr;
  28 } __attribute__((packed));
  29
  30 extern int in_cksum(void *data, int nbytes);
  31 extern int in_cksum_with_ph4(struct ipv4_ph *ph, void *data, int nbytes);
  32 extern int in_cksum_with_ph6(struct ipv6_ph *ph, void *data, int nbytes);
  33
  34 #define FLETCHER_CHECKSUM_VALIDATE 0xffff
  35 extern uint16_t fletcher_checksum(uint8_t *, const size_t len,
  36                                   const uint16_t offset);
  37
  38 #ifdef __cplusplus
  39 }
  40 #endif
  41
  42 #endif /* _FRR_CHECKSUM_H */