fix commands

[bytom/shuttle.git] / vendor / github.com / bytom / vendor / golang.org / x / net / icmp / ipv4.go

diff --git a/vendor/github.com/bytom/vendor/golang.org/x/net/icmp/ipv4.go b/vendor/github.com/bytom/vendor/golang.org/x/net/icmp/ipv4.go
new file mode 100644 (file)
index 0000000..ffc66ed
--- /dev/null
+++ b/vendor/github.com/bytom/vendor/golang.org/x/net/icmp/ipv4.go
@@ -0,0 +1,61 @@
+// Copyright 2014 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"
+       "net"
+       "runtime"
+
+       "golang.org/x/net/internal/socket"
+       "golang.org/x/net/ipv4"
+)
+
+// freebsdVersion is set in sys_freebsd.go.
+// See http://www.freebsd.org/doc/en/books/porters-handbook/freebsd-versions.html.
+var freebsdVersion uint32
+
+// ParseIPv4Header parses b as an IPv4 header of ICMP error message
+// invoking packet, which is contained in ICMP error message.
+func ParseIPv4Header(b []byte) (*ipv4.Header, error) {
+       if len(b) < ipv4.HeaderLen {
+               return nil, errHeaderTooShort
+       }
+       hdrlen := int(b[0]&0x0f) << 2
+       if hdrlen > len(b) {
+               return nil, errBufferTooShort
+       }
+       h := &ipv4.Header{
+               Version:  int(b[0] >> 4),
+               Len:      hdrlen,
+               TOS:      int(b[1]),
+               ID:       int(binary.BigEndian.Uint16(b[4:6])),
+               FragOff:  int(binary.BigEndian.Uint16(b[6:8])),
+               TTL:      int(b[8]),
+               Protocol: int(b[9]),
+               Checksum: int(binary.BigEndian.Uint16(b[10:12])),
+               Src:      net.IPv4(b[12], b[13], b[14], b[15]),
+               Dst:      net.IPv4(b[16], b[17], b[18], b[19]),
+       }
+       switch runtime.GOOS {
+       case "darwin":
+               h.TotalLen = int(socket.NativeEndian.Uint16(b[2:4]))
+       case "freebsd":
+               if freebsdVersion >= 1000000 {
+                       h.TotalLen = int(binary.BigEndian.Uint16(b[2:4]))
+               } else {
+                       h.TotalLen = int(socket.NativeEndian.Uint16(b[2:4]))
+               }
+       default:
+               h.TotalLen = int(binary.BigEndian.Uint16(b[2:4]))
+       }
+       h.Flags = ipv4.HeaderFlags(h.FragOff&0xe000) >> 13
+       h.FragOff = h.FragOff & 0x1fff
+       if hdrlen-ipv4.HeaderLen > 0 {
+               h.Options = make([]byte, hdrlen-ipv4.HeaderLen)
+               copy(h.Options, b[ipv4.HeaderLen:])
+       }
+       return h, nil
+}