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net: make IPv6 capability test more suitable for address family selection on the dual IP stack node

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For now we strictly use IPV6_V6ONLY=1 for IPv6-only communications
and IPV6_V6ONLY=0 for both IPv4 and IPv6 communications. So let the
capability test do the same.

LGTM=iant
R=golang-codereviews, gobot, iant
CC=golang-codereviews
https://golang.org/cl/80140044
This commit is contained in:
Mikio Hara 2014-03-28 13:27:51 +09:00
parent 753bdc0f47
commit a05ffd85aa
1 changed files with 4 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
src/pkg/net/ipsock_posix.go
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@ -40,12 +40,13 @@ func probeIPv4Stack() bool {
func probeIPv6Stack() (supportsIPv6, supportsIPv4map bool) {
var probes = []struct {
laddr TCPAddr
value int
ok bool
}{
// IPv6 communication capability
{TCPAddr{IP: ParseIP("::1")}, false},
{laddr: TCPAddr{IP: ParseIP("::1")}, value: 1},
// IPv6 IPv4-mapped address communication capability
{TCPAddr{IP: IPv4(127, 0, 0, 1)}, false},
{laddr: TCPAddr{IP: IPv4(127, 0, 0, 1)}, value: 0},
}
for i := range probes {
@ -54,7 +55,7 @@ func probeIPv6Stack() (supportsIPv6, supportsIPv4map bool) {
continue
}
defer closesocket(s)
syscall.SetsockoptInt(s, syscall.IPPROTO_IPV6, syscall.IPV6_V6ONLY, 0)
syscall.SetsockoptInt(s, syscall.IPPROTO_IPV6, syscall.IPV6_V6ONLY, probes[i].value)
sa, err := probes[i].laddr.sockaddr(syscall.AF_INET6)
if err != nil {
continue