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net: change the internal form of IPMask for IPv4
This CL changes the internal form of IPMask for IPv4 from 16-byte to 4-byte, also adds Size method to IPMask struct and changes output string format of IPMask.String method. R=rsc CC=golang-dev https://golang.org/cl/4950046
This commit is contained in:
Mikio Hara
Russ Cox
parent
1952eb5010
commit
683df29f7c
@ -21,8 +21,8 @@ const (
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)
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// An IP is a single IP address, an array of bytes.
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// Functions in this package accept either 4-byte (IP v4)
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// or 16-byte (IP v6) arrays as input. Unless otherwise
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// Functions in this package accept either 4-byte (IPv4)
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// or 16-byte (IPv6) arrays as input. Unless otherwise
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// specified, functions in this package always return
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// IP addresses in 16-byte form using the canonical
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// embedding.
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@ -51,17 +51,14 @@ func IPv4(a, b, c, d byte) IP {
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var v4InV6Prefix = []byte{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff}
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// IPv4Mask returns the IP mask (in 16-byte form) of the
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// IPv4Mask returns the IP mask (in 4-byte form) of the
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// IPv4 mask a.b.c.d.
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func IPv4Mask(a, b, c, d byte) IPMask {
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p := make(IPMask, IPv6len)
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for i := 0; i < 12; i++ {
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p[i] = 0xff
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}
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p[12] = a
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p[13] = b
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p[14] = c
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p[15] = d
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p := make(IPMask, IPv4len)
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p[0] = a
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p[1] = b
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p[2] = c
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p[3] = d
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return p
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}
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@ -213,13 +210,13 @@ func allFF(b []byte) bool {
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// Mask returns the result of masking the IP address ip with mask.
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func (ip IP) Mask(mask IPMask) IP {
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n := len(ip)
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if len(mask) == IPv6len && len(ip) == IPv4len && allFF(mask[:12]) {
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mask = mask[12:]
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}
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if len(mask) == IPv4len && len(ip) == IPv6len && bytesEqual(ip[:12], v4InV6Prefix) {
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ip = ip[12:]
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}
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n := len(ip)
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if n != len(mask) {
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return nil
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}
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@ -238,7 +235,7 @@ func (ip IP) String() string {
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p := ip
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if len(ip) == 0 {
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return ""
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return "<nil>"
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}
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// If IPv4, use dotted notation.
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@ -345,25 +342,27 @@ func simpleMaskLength(mask IPMask) int {
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return n
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}
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// String returns the string representation of mask.
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// If the mask is in the canonical form--ones followed by zeros--the
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// string representation is just the decimal number of ones.
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// If the mask is in a non-canonical form, it is formatted
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// as an IP address.
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func (mask IPMask) String() string {
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switch len(mask) {
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case IPv4len:
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n := simpleMaskLength(mask)
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if n >= 0 {
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return itod(uint(n + (IPv6len-IPv4len)*8))
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}
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case IPv6len:
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n := simpleMaskLength(mask)
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if n >= 12*8 {
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return itod(uint(n - 12*8))
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}
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// Size returns the number of leading ones and total bits in the mask.
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// If the mask is not in the canonical form--ones followed by zeros--then
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// Size returns 0, 0.
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func (m IPMask) Size() (ones, bits int) {
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ones, bits = simpleMaskLength(m), len(m)*8
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if ones == -1 {
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return 0, 0
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}
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return IP(mask).String()
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return
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}
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// String returns the hexadecimal form of m, with no punctuation.
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func (m IPMask) String() string {
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s := ""
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for _, b := range m {
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s += itox(uint(b), 2)
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}
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if len(s) == 0 {
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return "<nil>"
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}
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return s
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}
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// Parse IPv4 address (d.d.d.d).
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@ -535,7 +534,7 @@ func ParseIP(s string) IP {
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}
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// ParseCIDR parses s as a CIDR notation IP address and mask,
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// like "192.168.100.1/24", "2001:DB8::/48", as defined in
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// like "192.168.100.1/24" or "2001:DB8::/48", as defined in
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// RFC 4632 and RFC 4291.
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func ParseCIDR(s string) (ip IP, mask IPMask, err os.Error) {
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i := byteIndex(s, '/')
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@ -571,8 +570,12 @@ func ParseCIDR(s string) (ip IP, mask IPMask, err os.Error) {
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}
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}
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// address must not have any bits not in mask
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for i := range ip {
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if ip[i]&^mask[i] != 0 {
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mip := ip
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if iplen == IPv4len {
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mip = ip[12:]
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}
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for i := range mip {
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if mip[i]&^mask[i] != 0 {
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return nil, nil, &ParseError{"CIDR address", s}
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}
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}
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@ -49,22 +49,15 @@ var ipstringtests = []struct {
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out string
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}{
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// cf. RFC 5952 (A Recommendation for IPv6 Address Text Representation)
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{IP{0x20, 0x1, 0xd, 0xb8, 0, 0, 0, 0, 0, 0, 0x1, 0x23, 0, 0x12, 0, 0x1},
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"2001:db8::123:12:1"},
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{IP{0x20, 0x1, 0xd, 0xb8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x1},
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"2001:db8::1"},
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{IP{0x20, 0x1, 0xd, 0xb8, 0, 0, 0, 0x1, 0, 0, 0, 0x1, 0, 0, 0, 0x1},
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"2001:db8:0:1:0:1:0:1"},
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{IP{0x20, 0x1, 0xd, 0xb8, 0, 0x1, 0, 0, 0, 0x1, 0, 0, 0, 0x1, 0, 0},
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"2001:db8:1:0:1:0:1:0"},
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{IP{0x20, 0x1, 0, 0, 0, 0, 0, 0, 0, 0x1, 0, 0, 0, 0, 0, 0x1},
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"2001::1:0:0:1"},
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{IP{0x20, 0x1, 0xd, 0xb8, 0, 0, 0, 0, 0, 0x1, 0, 0, 0, 0, 0, 0},
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"2001:db8:0:0:1::"},
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{IP{0x20, 0x1, 0xd, 0xb8, 0, 0, 0, 0, 0, 0x1, 0, 0, 0, 0, 0, 0x1},
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"2001:db8::1:0:0:1"},
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{IP{0x20, 0x1, 0xD, 0xB8, 0, 0, 0, 0, 0, 0xA, 0, 0xB, 0, 0xC, 0, 0xD},
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"2001:db8::a:b:c:d"},
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{IP{0x20, 0x1, 0xd, 0xb8, 0, 0, 0, 0, 0, 0, 0x1, 0x23, 0, 0x12, 0, 0x1}, "2001:db8::123:12:1"},
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{IP{0x20, 0x1, 0xd, 0xb8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x1}, "2001:db8::1"},
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{IP{0x20, 0x1, 0xd, 0xb8, 0, 0, 0, 0x1, 0, 0, 0, 0x1, 0, 0, 0, 0x1}, "2001:db8:0:1:0:1:0:1"},
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{IP{0x20, 0x1, 0xd, 0xb8, 0, 0x1, 0, 0, 0, 0x1, 0, 0, 0, 0x1, 0, 0}, "2001:db8:1:0:1:0:1:0"},
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{IP{0x20, 0x1, 0, 0, 0, 0, 0, 0, 0, 0x1, 0, 0, 0, 0, 0, 0x1}, "2001::1:0:0:1"},
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{IP{0x20, 0x1, 0xd, 0xb8, 0, 0, 0, 0, 0, 0x1, 0, 0, 0, 0, 0, 0}, "2001:db8:0:0:1::"},
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{IP{0x20, 0x1, 0xd, 0xb8, 0, 0, 0, 0, 0, 0x1, 0, 0, 0, 0, 0, 0x1}, "2001:db8::1:0:0:1"},
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{IP{0x20, 0x1, 0xD, 0xB8, 0, 0, 0, 0, 0, 0xA, 0, 0xB, 0, 0xC, 0, 0xD}, "2001:db8::a:b:c:d"},
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{nil, "<nil>"},
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}
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func TestIPString(t *testing.T) {
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@ -75,6 +68,46 @@ func TestIPString(t *testing.T) {
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}
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}
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var ipmasktests = []struct {
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in IP
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mask IPMask
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out IP
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}{
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{IPv4(192, 168, 1, 127), IPv4Mask(255, 255, 255, 128), IPv4(192, 168, 1, 0)},
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{IPv4(192, 168, 1, 127), IPMask(ParseIP("255.255.255.192")), IPv4(192, 168, 1, 64)},
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{IPv4(192, 168, 1, 127), IPMask(ParseIP("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffe0")), IPv4(192, 168, 1, 96)},
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{IPv4(192, 168, 1, 127), IPv4Mask(255, 0, 255, 0), IPv4(192, 0, 1, 0)},
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{ParseIP("2001:db8::1"), IPMask(ParseIP("ffff:ff80::")), ParseIP("2001:d80::")},
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{ParseIP("2001:db8::1"), IPMask(ParseIP("f0f0:0f0f::")), ParseIP("2000:d08::")},
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}
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func TestIPMask(t *testing.T) {
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for _, tt := range ipmasktests {
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if out := tt.in.Mask(tt.mask); out == nil || !tt.out.Equal(out) {
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t.Errorf("IP(%v).Mask(%v) = %v, want %v", tt.in, tt.mask, out, tt.out)
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}
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}
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}
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var ipmaskstringtests = []struct {
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in IPMask
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out string
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}{
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{IPv4Mask(255, 255, 255, 240), "fffffff0"},
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{IPv4Mask(255, 0, 128, 0), "ff008000"},
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{IPMask(ParseIP("ffff:ff80::")), "ffffff80000000000000000000000000"},
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{IPMask(ParseIP("ef00:ff80::cafe:0")), "ef00ff800000000000000000cafe0000"},
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{nil, "<nil>"},
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}
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func TestIPMaskString(t *testing.T) {
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for _, tt := range ipmaskstringtests {
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if out := tt.in.String(); out != tt.out {
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t.Errorf("IPMask.String(%v) = %q, want %q", tt.in, out, tt.out)
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}
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}
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}
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var parsecidrtests = []struct {
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in string
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ip IP
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@ -101,7 +134,7 @@ var parsecidrtests = []struct {
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func TestParseCIDR(t *testing.T) {
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for _, tt := range parsecidrtests {
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if ip, mask, err := ParseCIDR(tt.in); !isEqual(ip, tt.ip) || !isEqual(mask, tt.mask) || !reflect.DeepEqual(err, tt.err) {
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if ip, mask, err := ParseCIDR(tt.in); !tt.ip.Equal(ip) || !isEqual(mask, tt.mask) || !reflect.DeepEqual(err, tt.err) {
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t.Errorf("ParseCIDR(%q) = %v, %v, %v; want %v, %v, %v", tt.in, ip, mask, err, tt.ip, tt.mask, tt.err)
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}
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}
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