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net: make use of IPv4len, IPv6len

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R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/4957043
This commit is contained in:
Mikio Hara 2011-08-25 19:00:04 -04:00 committed by Russ Cox
parent 0462f77e24
commit 78963f4f1d
1 changed files with 18 additions and 18 deletions
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36
src/pkg/net/ip.go
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@ -214,10 +214,10 @@ func allFF(b []byte) bool {
// Mask returns the result of masking the IP address ip with mask.
func (ip IP) Mask(mask IPMask) IP {
n := len(ip)
if len(mask) == 16 && len(ip) == 4 && allFF(mask[:12]) {
if len(mask) == IPv6len && len(ip) == IPv4len && allFF(mask[:12]) {
mask = mask[12:]
}
if len(mask) == 4 && len(ip) == 16 && bytesEqual(ip[:12], v4InV6Prefix) {
if len(mask) == IPv4len && len(ip) == IPv6len && bytesEqual(ip[:12], v4InV6Prefix) {
ip = ip[12:]
}
if n != len(mask) {
@ -276,7 +276,7 @@ func (ip IP) String() string {
}
// If IPv4, use dotted notation.
if p4 := p.To4(); len(p4) == 4 {
if p4 := p.To4(); len(p4) == IPv4len {
return itod(uint(p4[0])) + "." +
itod(uint(p4[1])) + "." +
itod(uint(p4[2])) + "." +
@ -289,9 +289,9 @@ func (ip IP) String() string {
// Find longest run of zeros.
e0 := -1
e1 := -1
for i := 0; i < 16; i += 2 {
for i := 0; i < IPv6len; i += 2 {
j := i
for j < 16 && p[j] == 0 && p[j+1] == 0 {
for j < IPv6len && p[j] == 0 && p[j+1] == 0 {
j += 2
}
if j > i && j-i > e1-e0 {
@ -307,11 +307,11 @@ func (ip IP) String() string {
// Print with possible :: in place of run of zeros
var s string
for i := 0; i < 16; i += 2 {
for i := 0; i < IPv6len; i += 2 {
if i == e0 {
s += "::"
i = e1
if i >= 16 {
if i >= IPv6len {
break
}
} else if i > 0 {
@ -329,10 +329,10 @@ func (ip IP) Equal(x IP) bool {
if len(ip) == len(x) {
return bytesEqual(ip, x)
}
if len(ip) == 4 && len(x) == 16 {
if len(ip) == IPv4len && len(x) == IPv6len {
return bytesEqual(x[0:12], v4InV6Prefix) && bytesEqual(ip, x[12:])
}
if len(ip) == 16 && len(x) == 4 {
if len(ip) == IPv6len && len(x) == IPv4len {
return bytesEqual(ip[0:12], v4InV6Prefix) && bytesEqual(ip[12:], x)
}
return false
@ -386,12 +386,12 @@ func simpleMaskLength(mask IPMask) int {
// as an IP address.
func (mask IPMask) String() string {
switch len(mask) {
case 4:
case IPv4len:
n := simpleMaskLength(mask)
if n >= 0 {
return itod(uint(n + (IPv6len-IPv4len)*8))
}
case 16:
case IPv6len:
n := simpleMaskLength(mask)
if n >= 12*8 {
return itod(uint(n - 12*8))
@ -440,7 +440,7 @@ func parseIPv4(s string) IP {
// * The last 32 bits can be in IPv4 form.
// Thus, ::ffff:1.2.3.4 is the IPv4 address 1.2.3.4.
func parseIPv6(s string) IP {
p := make(IP, 16)
p := make(IP, IPv6len)
ellipsis := -1 // position of ellipsis in p
i := 0 // index in string s
@ -482,7 +482,7 @@ func parseIPv6(s string) IP {
p[j+2] = p4[14]
p[j+3] = p4[15]
i = len(s)
j += 4
j += IPv4len
break
}
@ -577,10 +577,10 @@ func ParseCIDR(s string) (ip IP, mask IPMask, err os.Error) {
return nil, nil, &ParseError{"CIDR address", s}
}
ipstr, maskstr := s[:i], s[i+1:]
iplen := 4
iplen := IPv4len
ip = parseIPv4(ipstr)
if ip == nil {
iplen = 16
iplen = IPv6len
ip = parseIPv6(ipstr)
}
nn, i, ok := dtoi(maskstr, 0)
@ -588,12 +588,12 @@ func ParseCIDR(s string) (ip IP, mask IPMask, err os.Error) {
return nil, nil, &ParseError{"CIDR address", s}
}
n := uint(nn)
if iplen == 4 {
if iplen == IPv4len {
v4mask := ^uint32(0xffffffff >> n)
mask = IPv4Mask(byte(v4mask>>24), byte(v4mask>>16), byte(v4mask>>8), byte(v4mask))
} else {
mask = make(IPMask, 16)
for i := 0; i < 16; i++ {
mask = make(IPMask, IPv6len)
for i := 0; i < IPv6len; i++ {
if n >= 8 {
mask[i] = 0xff
n -= 8