ext/sockets: raw sockets, adding options of how to scale them.

- PACKET_FANOUT_HASH (default) distributes incoming raw packets
to a group of processes (per-flow group).
- PACKET_FANOUT_LB uses a round-robin algorithm.
- PACKET_FANOUT_CPU decision based on a given cpu instead.
- PACKET_FANOUT_RND uses a pseudo random generator.
- PACKET_FANOUT_QM uses the queue mapping high performance (hardware
  based).

Author: devnexen

ext/sockets/sockets.stub.php

@@ -1783,6 +1783,62 @@
 const SOL_LOCAL = UNKNOWN;
 #endif
 
+#ifdef SOL_PACKET
+/**
+ * @var int
+ * @cvalue SOL_PACKET
+ */
+const SOL_PACKET = UNKNOWN;
+#endif
+
+#ifdef PACKET_FANOUT
+/**
+ * @var int
+ * @cvalue PACKET_FANOUT
+ */
+const PACKET_FANOUT = UNKNOWN;
+#endif
+
+#ifdef PACKET_FANOUT_HASH
+/**
+ * @var int
+ * @cvalue PACKET_FANOUT_HASH
+ */
+const PACKET_FANOUT_HASH = UNKNOWN;
+#endif
+
+#ifdef PACKET_FANOUT_CPU
+/**
+ * @var int
+ * @cvalue PACKET_FANOUT_CPU
+ */
+const PACKET_FANOUT_CPU = UNKNOWN;
+#endif
+
+#ifdef PACKET_FANOUT_ROLLOVER
+/**
+ * @var int
+ * @cvalue PACKET_FANOUT_ROLLOVER
+ */
+const PACKET_FANOUT_ROLLOVER = UNKNOWN;
+#endif
+
+#ifdef PACKET_FANOUT_RND
+/**
+ * @var int
+ * @cvalue PACKET_FANOUT_RND
+ */
+const PACKET_FANOUT_RND = UNKNOWN;
+#endif
+
+#ifdef PACKET_FANOUT_QM
+/**
+ * @var int
+ * @cvalue PACKET_FANOUT_QM
+ */
+const PACKET_FANOUT_QM = UNKNOWN;
+#endif
+
 #if (defined(IPV6_RECVPKTINFO) && defined(HAVE_IPV6))
 /**
  * IPv6 ancillary data