release/src/router/zebra/lib/checksum.h

   1 /*
   2  * Checksum routine for Internet Protocol family headers (C Version).
   3  *
   4  * Refer to "Computing the Internet Checksum" by R. Braden, D. Borman and
   5  * C. Partridge, Computer Communication Review, Vol. 19, No. 2, April 1989,
   6  * pp. 86-101, for additional details on computing this checksum.
   7  */
   8
   9 int in_cksum (void *ptr, int nbytes);