Multicast socket API

net/udp/udp_socket_win.cc

Index: net/udp/udp_socket_win.cc
diff --git a/net/udp/udp_socket_win.cc b/net/udp/udp_socket_win.cc
index 5c6da9fc47c154dfd9e40ad682e980512eb19002..1ab96ac0aae63dfc58ca2a7f1600d9c0551e2510 100644
--- a/net/udp/udp_socket_win.cc
+++ b/net/udp/udp_socket_win.cc
@@ -355,7 +355,8 @@ int UDPSocketWin::Bind(const IPEndPoint& address) {
 }
 
 int UDPSocketWin::CreateSocket(const IPEndPoint& address) {
-  socket_ = WSASocket(address.GetSockAddrFamily(), SOCK_DGRAM, IPPROTO_UDP,
+  sock_addr_family_ = address.GetSockAddrFamily();
+  socket_ = WSASocket(sock_addr_family_, SOCK_DGRAM, IPPROTO_UDP,
                       NULL, 0, WSA_FLAG_OVERLAPPED);
   if (socket_ == INVALID_SOCKET)
     return MapSystemError(WSAGetLastError());
@@ -614,4 +615,99 @@ bool UDPSocketWin::ReceiveAddressToIPEndpoint(IPEndPoint* address) const {
   return address->FromSockAddr(storage.addr, storage.addr_len);
 }
 
+
+int UDPSocketWin::JoinGroup(
+    const net::IPAddressNumber& group_address) const {
+  DCHECK(CalledOnValidThread());
+  DCHECK(is_connected());
+  int rv = -1;
+  switch(group_address.size()) {
+    case kIPv4AddressSize: {
+      if (sock_addr_family_ != AF_INET) {
+        return ERR_ADDRESS_INVALID;
+      }
+      ip_mreq mreq;
+      memset(&mreq, 0, sizeof(mreq));
+      memcpy(&mreq.imr_multiaddr, &group_address[0], kIPv4AddressSize);
+      rv = setsockopt(socket_, IPPROTO_IP, IP_ADD_MEMBERSHIP,
+                      reinterpret_cast<const char*>(&mreq),
+                      sizeof(mreq));
+      break;
+    }
+    case kIPv6AddressSize: {
+      if (sock_addr_family_ != AF_INET6) {
+        return ERR_ADDRESS_INVALID;
+      }
+      ipv6_mreq mreq;
+      memset(&mreq, 0, sizeof(mreq));
+      memcpy(&mreq.ipv6mr_multiaddr, &group_address[0], kIPv6AddressSize);
+      rv = setsockopt(socket_, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP,
+                      reinterpret_cast<const char*>(&mreq),
+                      sizeof(mreq));
+      break;
+    }
+  }
+  return MapSystemError(rv);
+}
+
+int UDPSocketWin::LeaveGroup(
+    const net::IPAddressNumber& group_address) const {
+  DCHECK(CalledOnValidThread());
+  DCHECK(is_connected());
+  int rv = -1;
+  switch(group_address.size()) {
+    case kIPv4AddressSize: {
+      if (sock_addr_family_ != AF_INET) {
+        return ERR_ADDRESS_INVALID;
+      }
+      ip_mreq mreq;
+      memset(&mreq, 0, sizeof(mreq));
+      memcpy(&mreq.imr_multiaddr, &group_address[0], kIPv4AddressSize);
+      rv = setsockopt(socket_, IPPROTO_IP, IP_DROP_MEMBERSHIP,
+                      reinterpret_cast<const char*>(&mreq),
+                      sizeof(mreq));
+      break;
+    }
+    case kIPv6AddressSize: {
+      if (sock_addr_family_ != AF_INET6) {
+        return ERR_ADDRESS_INVALID;
+      }
+      ipv6_mreq mreq;
+      memset(&mreq, 0, sizeof(mreq));
+      memcpy(&mreq.ipv6mr_multiaddr, &group_address[0], kIPv6AddressSize);
+      rv = setsockopt(socket_, IPPROTO_IPV6, IP_DROP_MEMBERSHIP,
+                      reinterpret_cast<const char*>(&mreq),
+                      sizeof(mreq));
+      break;
+    }
+  }
+  return MapSystemError(rv);
+}
+
+int UDPSocketWin::SetMulticastTimeToLive(int timeToLive) {
+  DCHECK(CalledOnValidThread());
+  DCHECK(is_connected());
+
+  uint8 ttl = timeToLive;
+  int ip_family = sock_addr_family_ == AF_INET ? IPPROTO_IP : IPPROTO_IPV6;
+  return MapSystemError(setsockopt(socket_,
+      ip_family,
+      IP_MULTICAST_TTL,
+      reinterpret_cast<const char*>(&ttl),
+      sizeof(ttl)));
+}
+
+int UDPSocketWin::SetMulticastLoopbackMode(bool loopback) {
+  DCHECK(CalledOnValidThread());
+  DCHECK(is_connected());
+
+  uint8 loop = loopback;
+  int ip_family = sock_addr_family_ == AF_INET ? IPPROTO_IP : IPPROTO_IPV6;
+  return MapSystemError(setsockopt(socket_,
+    ip_family,
+    IP_MULTICAST_LOOP,
+    reinterpret_cast<const char*>(&loop),
+    sizeof(loop)));
+}
+
 }  // namespace net