diff options
Diffstat (limited to 'vendor/github.com/ishidawataru/sctp/ipsock_linux.go')
| -rw-r--r-- | vendor/github.com/ishidawataru/sctp/ipsock_linux.go | 222 |
1 files changed, 0 insertions, 222 deletions
diff --git a/vendor/github.com/ishidawataru/sctp/ipsock_linux.go b/vendor/github.com/ishidawataru/sctp/ipsock_linux.go deleted file mode 100644 index 3df30fa46..000000000 --- a/vendor/github.com/ishidawataru/sctp/ipsock_linux.go +++ /dev/null @@ -1,222 +0,0 @@ -// Copyright 2009 The Go Authors. All rights reserved. -// Use of this source code is governed by a BSD-style -// license that can be found in the GO_LICENSE file. - -package sctp - -import ( - "net" - "os" - "sync" - "syscall" -) - -//from https://github.com/golang/go -// Boolean to int. -func boolint(b bool) int { - if b { - return 1 - } - return 0 -} - -//from https://github.com/golang/go -func ipToSockaddr(family int, ip net.IP, port int, zone string) (syscall.Sockaddr, error) { - switch family { - case syscall.AF_INET: - if len(ip) == 0 { - ip = net.IPv4zero - } - ip4 := ip.To4() - if ip4 == nil { - return nil, &net.AddrError{Err: "non-IPv4 address", Addr: ip.String()} - } - sa := &syscall.SockaddrInet4{Port: port} - copy(sa.Addr[:], ip4) - return sa, nil - case syscall.AF_INET6: - // In general, an IP wildcard address, which is either - // "0.0.0.0" or "::", means the entire IP addressing - // space. For some historical reason, it is used to - // specify "any available address" on some operations - // of IP node. - // - // When the IP node supports IPv4-mapped IPv6 address, - // we allow an listener to listen to the wildcard - // address of both IP addressing spaces by specifying - // IPv6 wildcard address. - if len(ip) == 0 || ip.Equal(net.IPv4zero) { - ip = net.IPv6zero - } - // We accept any IPv6 address including IPv4-mapped - // IPv6 address. - ip6 := ip.To16() - if ip6 == nil { - return nil, &net.AddrError{Err: "non-IPv6 address", Addr: ip.String()} - } - //we set ZoneId to 0, as currently we use this functon only to probe the IP capabilities of the host - //if real Zone handling is required, the zone cache implementation in golang/net should be pulled here - sa := &syscall.SockaddrInet6{Port: port, ZoneId: 0} - copy(sa.Addr[:], ip6) - return sa, nil - } - return nil, &net.AddrError{Err: "invalid address family", Addr: ip.String()} -} - -//from https://github.com/golang/go -func sockaddr(a *net.TCPAddr, family int) (syscall.Sockaddr, error) { - if a == nil { - return nil, nil - } - return ipToSockaddr(family, a.IP, a.Port, a.Zone) -} - -//from https://github.com/golang/go -type ipStackCapabilities struct { - sync.Once // guards following - ipv4Enabled bool - ipv6Enabled bool - ipv4MappedIPv6Enabled bool -} - -//from https://github.com/golang/go -var ipStackCaps ipStackCapabilities - -//from https://github.com/golang/go -// supportsIPv4 reports whether the platform supports IPv4 networking -// functionality. -func supportsIPv4() bool { - ipStackCaps.Once.Do(ipStackCaps.probe) - return ipStackCaps.ipv4Enabled -} - -//from https://github.com/golang/go -// supportsIPv6 reports whether the platform supports IPv6 networking -// functionality. -func supportsIPv6() bool { - ipStackCaps.Once.Do(ipStackCaps.probe) - return ipStackCaps.ipv6Enabled -} - -//from https://github.com/golang/go -// supportsIPv4map reports whether the platform supports mapping an -// IPv4 address inside an IPv6 address at transport layer -// protocols. See RFC 4291, RFC 4038 and RFC 3493. -func supportsIPv4map() bool { - ipStackCaps.Once.Do(ipStackCaps.probe) - return ipStackCaps.ipv4MappedIPv6Enabled -} - -//from https://github.com/golang/go -// Probe probes IPv4, IPv6 and IPv4-mapped IPv6 communication -// capabilities which are controlled by the IPV6_V6ONLY socket option -// and kernel configuration. -// -// Should we try to use the IPv4 socket interface if we're only -// dealing with IPv4 sockets? As long as the host system understands -// IPv4-mapped IPv6, it's okay to pass IPv4-mapeed IPv6 addresses to -// the IPv6 interface. That simplifies our code and is most -// general. Unfortunately, we need to run on kernels built without -// IPv6 support too. So probe the kernel to figure it out. -func (p *ipStackCapabilities) probe() { - s, err := syscall.Socket(syscall.AF_INET, syscall.SOCK_STREAM, syscall.IPPROTO_TCP) - switch err { - case syscall.EAFNOSUPPORT, syscall.EPROTONOSUPPORT: - case nil: - syscall.Close(s) - p.ipv4Enabled = true - } - var probes = []struct { - laddr net.TCPAddr - value int - }{ - // IPv6 communication capability - {laddr: net.TCPAddr{IP: net.IPv6loopback}, value: 1}, - // IPv4-mapped IPv6 address communication capability - {laddr: net.TCPAddr{IP: net.IPv4(127, 0, 0, 1)}, value: 0}, - } - - for i := range probes { - s, err := syscall.Socket(syscall.AF_INET6, syscall.SOCK_STREAM, syscall.IPPROTO_TCP) - if err != nil { - continue - } - defer syscall.Close(s) - syscall.SetsockoptInt(s, syscall.IPPROTO_IPV6, syscall.IPV6_V6ONLY, probes[i].value) - sa, err := sockaddr(&(probes[i].laddr), syscall.AF_INET6) - if err != nil { - continue - } - if err := syscall.Bind(s, sa); err != nil { - continue - } - if i == 0 { - p.ipv6Enabled = true - } else { - p.ipv4MappedIPv6Enabled = true - } - } -} - -//from https://github.com/golang/go -//Change: we check the first IP address in the list of candidate SCTP IP addresses -func (a *SCTPAddr) isWildcard() bool { - if a == nil { - return true - } - if 0 == len(a.IPAddrs) { - return true - } - - return a.IPAddrs[0].IP.IsUnspecified() -} - -func (a *SCTPAddr) family() int { - if a != nil { - for _, ip := range a.IPAddrs { - if ip.IP.To4() == nil { - return syscall.AF_INET6 - } - } - } - return syscall.AF_INET -} - -//from https://github.com/golang/go -func favoriteAddrFamily(network string, laddr *SCTPAddr, raddr *SCTPAddr, mode string) (family int, ipv6only bool) { - switch network[len(network)-1] { - case '4': - return syscall.AF_INET, false - case '6': - return syscall.AF_INET6, true - } - - if mode == "listen" && (laddr == nil || laddr.isWildcard()) { - if supportsIPv4map() || !supportsIPv4() { - return syscall.AF_INET6, false - } - if laddr == nil { - return syscall.AF_INET, false - } - return laddr.family(), false - } - - if (laddr == nil || laddr.family() == syscall.AF_INET) && - (raddr == nil || raddr.family() == syscall.AF_INET) { - return syscall.AF_INET, false - } - return syscall.AF_INET6, false -} - -//from https://github.com/golang/go -//Changes: it is for SCTP only -func setDefaultSockopts(s int, family int, ipv6only bool) error { - if family == syscall.AF_INET6 { - // Allow both IP versions even if the OS default - // is otherwise. Note that some operating systems - // never admit this option. - syscall.SetsockoptInt(s, syscall.IPPROTO_IPV6, syscall.IPV6_V6ONLY, boolint(ipv6only)) - } - // Allow broadcast. - return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_BROADCAST, 1)) -} |