David K. Bainbridge | 215e024 | 2017-09-05 23:18:24 -0700 | [diff] [blame] | 1 | // Copyright 2012 The Go Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style |
| 3 | // license that can be found in the LICENSE file. |
| 4 | |
| 5 | package ipv4 |
| 6 | |
| 7 | import ( |
| 8 | "errors" |
| 9 | "net" |
| 10 | ) |
| 11 | |
| 12 | var ( |
| 13 | errMissingAddress = errors.New("missing address") |
| 14 | errMissingHeader = errors.New("missing header") |
| 15 | errHeaderTooShort = errors.New("header too short") |
| 16 | errBufferTooShort = errors.New("buffer too short") |
| 17 | errInvalidConnType = errors.New("invalid conn type") |
| 18 | errOpNoSupport = errors.New("operation not supported") |
| 19 | errNoSuchInterface = errors.New("no such interface") |
| 20 | errNoSuchMulticastInterface = errors.New("no such multicast interface") |
| 21 | |
| 22 | // See http://www.freebsd.org/doc/en/books/porters-handbook/freebsd-versions.html. |
| 23 | freebsdVersion uint32 |
| 24 | ) |
| 25 | |
| 26 | func boolint(b bool) int { |
| 27 | if b { |
| 28 | return 1 |
| 29 | } |
| 30 | return 0 |
| 31 | } |
| 32 | |
| 33 | func netAddrToIP4(a net.Addr) net.IP { |
| 34 | switch v := a.(type) { |
| 35 | case *net.UDPAddr: |
| 36 | if ip := v.IP.To4(); ip != nil { |
| 37 | return ip |
| 38 | } |
| 39 | case *net.IPAddr: |
| 40 | if ip := v.IP.To4(); ip != nil { |
| 41 | return ip |
| 42 | } |
| 43 | } |
| 44 | return nil |
| 45 | } |
| 46 | |
| 47 | func opAddr(a net.Addr) net.Addr { |
| 48 | switch a.(type) { |
| 49 | case *net.TCPAddr: |
| 50 | if a == nil { |
| 51 | return nil |
| 52 | } |
| 53 | case *net.UDPAddr: |
| 54 | if a == nil { |
| 55 | return nil |
| 56 | } |
| 57 | case *net.IPAddr: |
| 58 | if a == nil { |
| 59 | return nil |
| 60 | } |
| 61 | } |
| 62 | return a |
| 63 | } |