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Try to guess prefixlen for guessable cases.

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- /0 if matches ::/128
- /64 if matches 2000::/3 and lowermost 64 bit is all 0
- /128 if matches 2000::/3 and lowermost 64 bit is non-zero 0

Obtained from:	KAME/NetBSD
This commit is contained in:
Hajimu UMEMOTO 2002-05-20 15:01:19 +00:00
parent e9e705b0df
commit 5818927a00
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=96997
1 changed files with 33 additions and 0 deletions
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33
sbin/route/route.c
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@ -859,6 +859,37 @@ inet_makenetandmask(net, sin, bits)
sin->sin_len = 1 + cp - (char *)sin;
}
#ifdef INET6
/*
* XXX the function may need more improvement...
*/
static void
inet6_makenetandmask(sin6)
struct sockaddr_in6 *sin6;
{
char *plen;
struct in6_addr in6;
plen = NULL;
if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) &&
sin6->sin6_scope_id == 0) {
plen = "0";
} else if ((sin6->sin6_addr.s6_addr[0] & 0xe0) == 0x20) {
/* aggregatable global unicast - RFC2374 */
memset(&in6, 0, sizeof(in6));
if (!memcmp(&sin6->sin6_addr.s6_addr[8], &in6.s6_addr[8], 8))
plen = "64";
else
plen = "128";
}
if (plen) {
rtm_addrs |= RTA_NETMASK;
prefixlen(plen);
}
}
#endif
/*
* Interpret an argument as a network address of some kind,
* returning 1 if a host address, 0 if a network address.
@ -980,6 +1011,8 @@ getaddr(which, s, hpp)
su->sin6.sin6_scope_id = 0;
}
#endif
if (which == RTA_DST)
inet6_makenetandmask(&su->sin6);
freeaddrinfo(res);
return (0);
}