| // Copyright 2012 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 ipv4 |
| |
| import ( |
| "errors" |
| "net" |
| "runtime" |
| |
| "golang.org/x/net/internal/socket" |
| ) |
| |
| var ( |
| errInvalidConn = errors.New("invalid connection") |
| errMissingAddress = errors.New("missing address") |
| errMissingHeader = errors.New("missing header") |
| errNilHeader = errors.New("nil header") |
| errHeaderTooShort = errors.New("header too short") |
| errExtHeaderTooShort = errors.New("extension header too short") |
| errInvalidConnType = errors.New("invalid conn type") |
| errNoSuchInterface = errors.New("no such interface") |
| errNoSuchMulticastInterface = errors.New("no such multicast interface") |
| errNotImplemented = errors.New("not implemented on " + runtime.GOOS + "/" + runtime.GOARCH) |
| |
| // See https://www.freebsd.org/doc/en/books/porters-handbook/versions.html. |
| freebsdVersion uint32 |
| compatFreeBSD32 bool // 386 emulation on amd64 |
| ) |
| |
| // See golang.org/issue/30899. |
| func adjustFreeBSD32(m *socket.Message) { |
| // FreeBSD 12.0-RELEASE is affected by https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236737 |
| if 1200086 <= freebsdVersion && freebsdVersion < 1201000 { |
| l := (m.NN + 4 - 1) &^ (4 - 1) |
| if m.NN < l && l <= len(m.OOB) { |
| m.NN = l |
| } |
| } |
| } |
| |
| func boolint(b bool) int { |
| if b { |
| return 1 |
| } |
| return 0 |
| } |
| |
| func netAddrToIP4(a net.Addr) net.IP { |
| switch v := a.(type) { |
| case *net.UDPAddr: |
| if ip := v.IP.To4(); ip != nil { |
| return ip |
| } |
| case *net.IPAddr: |
| if ip := v.IP.To4(); ip != nil { |
| return ip |
| } |
| } |
| return nil |
| } |
| |
| func opAddr(a net.Addr) net.Addr { |
| switch a.(type) { |
| case *net.TCPAddr: |
| if a == nil { |
| return nil |
| } |
| case *net.UDPAddr: |
| if a == nil { |
| return nil |
| } |
| case *net.IPAddr: |
| if a == nil { |
| return nil |
| } |
| } |
| return a |
| } |