net, syscall: move multicast address handling
Multicast address handling is not consistent across all BSDs. Move
the multicast address handling code into OS dependent files. This
will be needed for OpenBSD support.
R=mikioh.mikioh, golang-dev
CC=golang-dev
https://golang.org/cl/4809074
diff --git a/src/pkg/syscall/route_freebsd.go b/src/pkg/syscall/route_freebsd.go
index 128e93c..0d61d08 100644
--- a/src/pkg/syscall/route_freebsd.go
+++ b/src/pkg/syscall/route_freebsd.go
@@ -46,3 +46,32 @@
Header IfmaMsghdr
Data []byte
}
+
+const rtaIfmaMask = RTA_GATEWAY | RTA_IFP | RTA_IFA
+
+func (m *InterfaceMulticastAddrMessage) sockaddr() (sas []Sockaddr) {
+ if m.Header.Addrs&rtaIfmaMask == 0 {
+ return nil
+ }
+
+ buf := m.Data[:]
+ for i := uint(0); i < RTAX_MAX; i++ {
+ if m.Header.Addrs&rtaIfmaMask&(1<<i) == 0 {
+ continue
+ }
+ rsa := (*RawSockaddr)(unsafe.Pointer(&buf[0]))
+ switch i {
+ case RTAX_IFA:
+ sa, e := anyToSockaddr((*RawSockaddrAny)(unsafe.Pointer(rsa)))
+ if e != 0 {
+ return nil
+ }
+ sas = append(sas, sa)
+ case RTAX_GATEWAY, RTAX_IFP:
+ // nothing to do
+ }
+ buf = buf[rsaAlignOf(int(rsa.Len)):]
+ }
+
+ return sas
+}
