From 621e49bb465f500cc46d47e39e828cf76d6381d7 Mon Sep 17 00:00:00 2001 From: Dimitri Sokolyuk Date: Tue, 24 Jul 2018 14:35:44 +0200 Subject: update vendor --- vendor/golang.org/x/net/route/address.go | 425 +++++++++++++++++++++++++++++++ 1 file changed, 425 insertions(+) create mode 100644 vendor/golang.org/x/net/route/address.go (limited to 'vendor/golang.org/x/net/route/address.go') diff --git a/vendor/golang.org/x/net/route/address.go b/vendor/golang.org/x/net/route/address.go new file mode 100644 index 0000000..e6bfa39 --- /dev/null +++ b/vendor/golang.org/x/net/route/address.go @@ -0,0 +1,425 @@ +// Copyright 2016 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// +build darwin dragonfly freebsd netbsd openbsd + +package route + +import "runtime" + +// An Addr represents an address associated with packet routing. +type Addr interface { + // Family returns an address family. + Family() int +} + +// A LinkAddr represents a link-layer address. +type LinkAddr struct { + Index int // interface index when attached + Name string // interface name when attached + Addr []byte // link-layer address when attached +} + +// Family implements the Family method of Addr interface. +func (a *LinkAddr) Family() int { return sysAF_LINK } + +func (a *LinkAddr) lenAndSpace() (int, int) { + l := 8 + len(a.Name) + len(a.Addr) + return l, roundup(l) +} + +func (a *LinkAddr) marshal(b []byte) (int, error) { + l, ll := a.lenAndSpace() + if len(b) < ll { + return 0, errShortBuffer + } + nlen, alen := len(a.Name), len(a.Addr) + if nlen > 255 || alen > 255 { + return 0, errInvalidAddr + } + b[0] = byte(l) + b[1] = sysAF_LINK + if a.Index > 0 { + nativeEndian.PutUint16(b[2:4], uint16(a.Index)) + } + data := b[8:] + if nlen > 0 { + b[5] = byte(nlen) + copy(data[:nlen], a.Addr) + data = data[nlen:] + } + if alen > 0 { + b[6] = byte(alen) + copy(data[:alen], a.Name) + data = data[alen:] + } + return ll, nil +} + +func parseLinkAddr(b []byte) (Addr, error) { + if len(b) < 8 { + return nil, errInvalidAddr + } + _, a, err := parseKernelLinkAddr(sysAF_LINK, b[4:]) + if err != nil { + return nil, err + } + a.(*LinkAddr).Index = int(nativeEndian.Uint16(b[2:4])) + return a, nil +} + +// parseKernelLinkAddr parses b as a link-layer address in +// conventional BSD kernel form. +func parseKernelLinkAddr(_ int, b []byte) (int, Addr, error) { + // The encoding looks like the following: + // +----------------------------+ + // | Type (1 octet) | + // +----------------------------+ + // | Name length (1 octet) | + // +----------------------------+ + // | Address length (1 octet) | + // +----------------------------+ + // | Selector length (1 octet) | + // +----------------------------+ + // | Data (variable) | + // +----------------------------+ + // + // On some platforms, all-bit-one of length field means "don't + // care". + nlen, alen, slen := int(b[1]), int(b[2]), int(b[3]) + if nlen == 0xff { + nlen = 0 + } + if alen == 0xff { + alen = 0 + } + if slen == 0xff { + slen = 0 + } + l := 4 + nlen + alen + slen + if len(b) < l { + return 0, nil, errInvalidAddr + } + data := b[4:] + var name string + var addr []byte + if nlen > 0 { + name = string(data[:nlen]) + data = data[nlen:] + } + if alen > 0 { + addr = data[:alen] + data = data[alen:] + } + return l, &LinkAddr{Name: name, Addr: addr}, nil +} + +// An Inet4Addr represents an internet address for IPv4. +type Inet4Addr struct { + IP [4]byte // IP address +} + +// Family implements the Family method of Addr interface. +func (a *Inet4Addr) Family() int { return sysAF_INET } + +func (a *Inet4Addr) lenAndSpace() (int, int) { + return sizeofSockaddrInet, roundup(sizeofSockaddrInet) +} + +func (a *Inet4Addr) marshal(b []byte) (int, error) { + l, ll := a.lenAndSpace() + if len(b) < ll { + return 0, errShortBuffer + } + b[0] = byte(l) + b[1] = sysAF_INET + copy(b[4:8], a.IP[:]) + return ll, nil +} + +// An Inet6Addr represents an internet address for IPv6. +type Inet6Addr struct { + IP [16]byte // IP address + ZoneID int // zone identifier +} + +// Family implements the Family method of Addr interface. +func (a *Inet6Addr) Family() int { return sysAF_INET6 } + +func (a *Inet6Addr) lenAndSpace() (int, int) { + return sizeofSockaddrInet6, roundup(sizeofSockaddrInet6) +} + +func (a *Inet6Addr) marshal(b []byte) (int, error) { + l, ll := a.lenAndSpace() + if len(b) < ll { + return 0, errShortBuffer + } + b[0] = byte(l) + b[1] = sysAF_INET6 + copy(b[8:24], a.IP[:]) + if a.ZoneID > 0 { + nativeEndian.PutUint32(b[24:28], uint32(a.ZoneID)) + } + return ll, nil +} + +// parseInetAddr parses b as an internet address for IPv4 or IPv6. +func parseInetAddr(af int, b []byte) (Addr, error) { + switch af { + case sysAF_INET: + if len(b) < sizeofSockaddrInet { + return nil, errInvalidAddr + } + a := &Inet4Addr{} + copy(a.IP[:], b[4:8]) + return a, nil + case sysAF_INET6: + if len(b) < sizeofSockaddrInet6 { + return nil, errInvalidAddr + } + a := &Inet6Addr{ZoneID: int(nativeEndian.Uint32(b[24:28]))} + copy(a.IP[:], b[8:24]) + if a.IP[0] == 0xfe && a.IP[1]&0xc0 == 0x80 || a.IP[0] == 0xff && (a.IP[1]&0x0f == 0x01 || a.IP[1]&0x0f == 0x02) { + // KAME based IPv6 protocol stack usually + // embeds the interface index in the + // interface-local or link-local address as + // the kernel-internal form. + id := int(bigEndian.Uint16(a.IP[2:4])) + if id != 0 { + a.ZoneID = id + a.IP[2], a.IP[3] = 0, 0 + } + } + return a, nil + default: + return nil, errInvalidAddr + } +} + +// parseKernelInetAddr parses b as an internet address in conventional +// BSD kernel form. +func parseKernelInetAddr(af int, b []byte) (int, Addr, error) { + // The encoding looks similar to the NLRI encoding. + // +----------------------------+ + // | Length (1 octet) | + // +----------------------------+ + // | Address prefix (variable) | + // +----------------------------+ + // + // The differences between the kernel form and the NLRI + // encoding are: + // + // - The length field of the kernel form indicates the prefix + // length in bytes, not in bits + // + // - In the kernel form, zero value of the length field + // doesn't mean 0.0.0.0/0 or ::/0 + // + // - The kernel form appends leading bytes to the prefix field + // to make the tuple to be conformed with + // the routing message boundary + l := int(b[0]) + if runtime.GOOS == "darwin" { + // On Darwn, an address in the kernel form is also + // used as a message filler. + if l == 0 || len(b) > roundup(l) { + l = roundup(l) + } + } else { + l = roundup(l) + } + if len(b) < l { + return 0, nil, errInvalidAddr + } + // Don't reorder case expressions. + // The case expressions for IPv6 must come first. + const ( + off4 = 4 // offset of in_addr + off6 = 8 // offset of in6_addr + ) + switch { + case b[0] == sizeofSockaddrInet6: + a := &Inet6Addr{} + copy(a.IP[:], b[off6:off6+16]) + return int(b[0]), a, nil + case af == sysAF_INET6: + a := &Inet6Addr{} + if l-1 < off6 { + copy(a.IP[:], b[1:l]) + } else { + copy(a.IP[:], b[l-off6:l]) + } + return int(b[0]), a, nil + case b[0] == sizeofSockaddrInet: + a := &Inet4Addr{} + copy(a.IP[:], b[off4:off4+4]) + return int(b[0]), a, nil + default: // an old fashion, AF_UNSPEC or unknown means AF_INET + a := &Inet4Addr{} + if l-1 < off4 { + copy(a.IP[:], b[1:l]) + } else { + copy(a.IP[:], b[l-off4:l]) + } + return int(b[0]), a, nil + } +} + +// A DefaultAddr represents an address of various operating +// system-specific features. +type DefaultAddr struct { + af int + Raw []byte // raw format of address +} + +// Family implements the Family method of Addr interface. +func (a *DefaultAddr) Family() int { return a.af } + +func (a *DefaultAddr) lenAndSpace() (int, int) { + l := len(a.Raw) + return l, roundup(l) +} + +func (a *DefaultAddr) marshal(b []byte) (int, error) { + l, ll := a.lenAndSpace() + if len(b) < ll { + return 0, errShortBuffer + } + if l > 255 { + return 0, errInvalidAddr + } + b[1] = byte(l) + copy(b[:l], a.Raw) + return ll, nil +} + +func parseDefaultAddr(b []byte) (Addr, error) { + if len(b) < 2 || len(b) < int(b[0]) { + return nil, errInvalidAddr + } + a := &DefaultAddr{af: int(b[1]), Raw: b[:b[0]]} + return a, nil +} + +func addrsSpace(as []Addr) int { + var l int + for _, a := range as { + switch a := a.(type) { + case *LinkAddr: + _, ll := a.lenAndSpace() + l += ll + case *Inet4Addr: + _, ll := a.lenAndSpace() + l += ll + case *Inet6Addr: + _, ll := a.lenAndSpace() + l += ll + case *DefaultAddr: + _, ll := a.lenAndSpace() + l += ll + } + } + return l +} + +// marshalAddrs marshals as and returns a bitmap indicating which +// address is stored in b. +func marshalAddrs(b []byte, as []Addr) (uint, error) { + var attrs uint + for i, a := range as { + switch a := a.(type) { + case *LinkAddr: + l, err := a.marshal(b) + if err != nil { + return 0, err + } + b = b[l:] + attrs |= 1 << uint(i) + case *Inet4Addr: + l, err := a.marshal(b) + if err != nil { + return 0, err + } + b = b[l:] + attrs |= 1 << uint(i) + case *Inet6Addr: + l, err := a.marshal(b) + if err != nil { + return 0, err + } + b = b[l:] + attrs |= 1 << uint(i) + case *DefaultAddr: + l, err := a.marshal(b) + if err != nil { + return 0, err + } + b = b[l:] + attrs |= 1 << uint(i) + } + } + return attrs, nil +} + +func parseAddrs(attrs uint, fn func(int, []byte) (int, Addr, error), b []byte) ([]Addr, error) { + var as [sysRTAX_MAX]Addr + af := int(sysAF_UNSPEC) + for i := uint(0); i < sysRTAX_MAX && len(b) >= roundup(0); i++ { + if attrs&(1<