From a798b9f0e171643b0bc7bbf79f14cb018689f715 Mon Sep 17 00:00:00 2001 From: "Steinar H. Gunderson" Date: Mon, 20 Dec 2010 11:15:33 +0100 Subject: [PATCH] Backport (simple cherry-pick) d1624add2b73ce8ff7826ce27b1d6d6e35bb83a6 to gingerbread. Don't treat private IPv4 addresses as being in a non-global scope. The effect of this change is essentially to prefer NATed IPv4 over 6to4. --- libc/netbsd/net/getaddrinfo.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/libc/netbsd/net/getaddrinfo.c b/libc/netbsd/net/getaddrinfo.c index e7564c427..aa3b81abb 100644 --- a/libc/netbsd/net/getaddrinfo.c +++ b/libc/netbsd/net/getaddrinfo.c @@ -1299,11 +1299,13 @@ _get_scope(const struct sockaddr *addr) if (IN_LOOPBACK(na) || /* 127.0.0.0/8 */ (na & 0xffff0000) == 0xa9fe0000) { /* 169.254.0.0/16 */ return IPV6_ADDR_SCOPE_LINKLOCAL; - } else if ((na & 0xff000000) == 0x0a000000 || /* 10.0.0.0/8 */ - (na & 0xfff00000) == 0xac100000 || /* 172.16.0.0/12 */ - (na & 0xffff0000) == 0xc0a80000) { /* 192.168.0.0/16 */ - return IPV6_ADDR_SCOPE_SITELOCAL; } else { + /* + * According to draft-ietf-6man-rfc3484-revise-01 section 2.3, + * it is best not to treat the private IPv4 ranges + * (10.0.0.0/8, 172.16.0.0/12 and 192.168.0.0/16) as being + * in a special scope, so we don't. + */ return IPV6_ADDR_SCOPE_GLOBAL; } } else {