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71029cea2d
This updates all source files to use a new standard header for copyright and license declaration. Notably, copyright no longer includes a date, and we now use the standard SPDX-License-Identifier header. This commit was done almost entirely mechanically with perl, and then some minimal manual fixes. Updates #6865 Signed-off-by: Will Norris <will@tailscale.com>
50 lines
1.3 KiB
Go
50 lines
1.3 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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// Package netaddr is a transitional package while we finish migrating from inet.af/netaddr
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// to Go 1.18's net/netip.
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//
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// TODO(bradfitz): delete this package eventually. Tracking bug is
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// https://github.com/tailscale/tailscale/issues/5162
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package netaddr
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import (
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"net"
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"net/netip"
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)
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// IPv4 returns the IP of the IPv4 address a.b.c.d.
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func IPv4(a, b, c, d uint8) netip.Addr {
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return netip.AddrFrom4([4]byte{a, b, c, d})
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}
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// Unmap returns the provided AddrPort with its Addr IP component Unmap'ed.
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//
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// See https://github.com/golang/go/issues/53607#issuecomment-1203466984
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func Unmap(ap netip.AddrPort) netip.AddrPort {
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return netip.AddrPortFrom(ap.Addr().Unmap(), ap.Port())
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}
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// FromStdIPNet returns an IPPrefix from the standard library's IPNet type.
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// If std is invalid, ok is false.
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func FromStdIPNet(std *net.IPNet) (prefix netip.Prefix, ok bool) {
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ip, ok := netip.AddrFromSlice(std.IP)
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if !ok {
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return netip.Prefix{}, false
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}
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ip = ip.Unmap()
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if l := len(std.Mask); l != net.IPv4len && l != net.IPv6len {
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// Invalid mask.
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return netip.Prefix{}, false
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}
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ones, bits := std.Mask.Size()
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if ones == 0 && bits == 0 {
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// IPPrefix does not support non-contiguous masks.
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return netip.Prefix{}, false
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}
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return netip.PrefixFrom(ip, ones), true
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}
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