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path: root/vendor/golang.org/x/net/icmp/extension.go
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Diffstat (limited to 'vendor/golang.org/x/net/icmp/extension.go')
-rw-r--r--vendor/golang.org/x/net/icmp/extension.go108
1 files changed, 0 insertions, 108 deletions
diff --git a/vendor/golang.org/x/net/icmp/extension.go b/vendor/golang.org/x/net/icmp/extension.go
deleted file mode 100644
index 2005068..0000000
--- a/vendor/golang.org/x/net/icmp/extension.go
+++ /dev/null
@@ -1,108 +0,0 @@
-// Copyright 2015 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.
-
-package icmp
-
-import (
- "encoding/binary"
-
- "golang.org/x/net/ipv4"
- "golang.org/x/net/ipv6"
-)
-
-// An Extension represents an ICMP extension.
-type Extension interface {
- // Len returns the length of ICMP extension.
- // Proto must be either the ICMPv4 or ICMPv6 protocol number.
- Len(proto int) int
-
- // Marshal returns the binary encoding of ICMP extension.
- // Proto must be either the ICMPv4 or ICMPv6 protocol number.
- Marshal(proto int) ([]byte, error)
-}
-
-const extensionVersion = 2
-
-func validExtensionHeader(b []byte) bool {
- v := int(b[0]&0xf0) >> 4
- s := binary.BigEndian.Uint16(b[2:4])
- if s != 0 {
- s = checksum(b)
- }
- if v != extensionVersion || s != 0 {
- return false
- }
- return true
-}
-
-// parseExtensions parses b as a list of ICMP extensions.
-// The length attribute l must be the length attribute field in
-// received icmp messages.
-//
-// It will return a list of ICMP extensions and an adjusted length
-// attribute that represents the length of the padded original
-// datagram field. Otherwise, it returns an error.
-func parseExtensions(typ Type, b []byte, l int) ([]Extension, int, error) {
- // Still a lot of non-RFC 4884 compliant implementations are
- // out there. Set the length attribute l to 128 when it looks
- // inappropriate for backwards compatibility.
- //
- // A minimal extension at least requires 8 octets; 4 octets
- // for an extension header, and 4 octets for a single object
- // header.
- //
- // See RFC 4884 for further information.
- switch typ {
- case ipv4.ICMPTypeExtendedEchoRequest, ipv6.ICMPTypeExtendedEchoRequest:
- if len(b) < 8 || !validExtensionHeader(b) {
- return nil, -1, errNoExtension
- }
- l = 0
- default:
- if 128 > l || l+8 > len(b) {
- l = 128
- }
- if l+8 > len(b) {
- return nil, -1, errNoExtension
- }
- if !validExtensionHeader(b[l:]) {
- if l == 128 {
- return nil, -1, errNoExtension
- }
- l = 128
- if !validExtensionHeader(b[l:]) {
- return nil, -1, errNoExtension
- }
- }
- }
- var exts []Extension
- for b = b[l+4:]; len(b) >= 4; {
- ol := int(binary.BigEndian.Uint16(b[:2]))
- if 4 > ol || ol > len(b) {
- break
- }
- switch b[2] {
- case classMPLSLabelStack:
- ext, err := parseMPLSLabelStack(b[:ol])
- if err != nil {
- return nil, -1, err
- }
- exts = append(exts, ext)
- case classInterfaceInfo:
- ext, err := parseInterfaceInfo(b[:ol])
- if err != nil {
- return nil, -1, err
- }
- exts = append(exts, ext)
- case classInterfaceIdent:
- ext, err := parseInterfaceIdent(b[:ol])
- if err != nil {
- return nil, -1, err
- }
- exts = append(exts, ext)
- }
- b = b[ol:]
- }
- return exts, l, nil
-}