September 2002
Intermediate to advanced
560 pages
13h 16m
English
book
VRRP: Increasing Reliability and Failover with the Virtual Router Redundance Protocol
by Ayikudy Srikanth, Adnan Adam Onart
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C.2. Computing fhe VRRP Checksum
From this point on, we will discuss the various components of file, vrrpd.c:
/********************************************************* NAME : in_csum *********************************************************/ static u_short in_csum( u_short *addr, int len, u_short csum) { register int nleft = len; const u_short *w = addr; register u_short answer; register int sum = csum; /* * Our algorithm is simple, using a 32 bit accumulator (sum), we add sequential 16 bit words to it, and at the end, fold back all the carry bits from the top 16 bits into the lower 16 bits. */ while (nleft > 1) { sum += *w++; nleft -= 2; } /* mop up an odd octet, if necessary */ if (nleft == 1) sum += htons(*(u_char *)w << 8); /* * add back ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.