Is there a POSIX header that defines maximum prefix lengths for IPv4/6?

Question

I want something like INET[6]_ADDRSTRLEN but containing the maximum value of the prefix length, i.e. 32 for v4 and 128 for v6.

Obviously I can #define my own versions, but wondered if I was just ignorant of the correct header. I've looked in <arpa/inet.h> and similar but not found anything.

@AjayBrahmakshatriya: For the sake of symmetry I'd propose: 8 * sizeof (struct in_addr) and 8 * sizeof (struct in6_addr)) — alk
– alk, Commented Aug 21, 2017 at 16:57
@AjayBrahmakshatriya: I'm not sure that's clearer for the case that I'm using it for. I'm basically setting a default value of 32 or 128, depending on the address family. I think something like #define INET_MAX_PREFIX_LEN 32 and #define INET6_MAX_PREFIX_LEN 128 would be clearest, if they don't already exist. — Kyle_S-C
– Kyle_S-C, Commented Aug 21, 2017 at 16:58

JonOsterman · Accepted Answer · 2017-08-21 16:39:11Z

1

<netinet/in.h> could be what you are searching

netinet/in.h

answered Aug 21, 2017 at 16:39

JonOsterman

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4 Comments

alk Over a year ago

This does not provide an answer to the question, but would have better suited as comment.

JonOsterman Over a year ago

I agree but I can't comment for now, should I delete ?

alk Over a year ago

Comment now, then delete. ;-)

JonOsterman Over a year ago

I need 50rep to comment :'(

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