Introduce wtap, the beginnings of a net80211 wlan simulator.

This introduces:

* a basic wtap interface
* a HAL, which implements an abstraction layer for implementing
  different device behavious;
* A visibility plugin, which allows for control over which nodes
  see other nodes (useful for mesh work.)

It doesn't yet implement sta/adhoc/hostap modes but these are quite
feasible to implement.

Monthadar uses it to do 802.11s mesh verification.

The userland tools will be committed in a follow-up commit.

Submitted by:	Monthadar Al Jaberi <monthadar@gmail.com>

1 files changed, 72 insertions, 0 deletions

diff --git a/sys/dev/wtap/if_medium.h b/sys/dev/wtap/if_medium.h
new file mode 100644
index 0000000..0650a5e
--- /dev/null
+++ b/sys/dev/wtap/if_medium.h
@@ -0,0 +1,72 @@
+/*-
+ * Copyright (c) 2010-2011 Monthadar Al Jaberi, TerraNet AB
+ * All rights reserved.
+ *
+ * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce at minimum a disclaimer
+ *    similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
+ *    redistribution must be conditioned upon including a substantially
+ *    similar Disclaimer requirement for further binary redistribution.
+ *
+ * NO WARRANTY
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
+ * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
+ * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
+ * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGES.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef	__DEV_WTAP_MEDIUM_H__
+#define	__DEV_WTAP_MEDIUM_H__
+
+#include "if_wtapvar.h"
+#include "wtap_hal/handler.h"
+
+struct packet {
+	STAILQ_ENTRY(packet)	pf_list;
+	struct mbuf *		m;
+	int			id;
+};
+typedef STAILQ_HEAD(, packet) md_pkthead;
+
+struct wtap_medium {
+	struct mtx 			md_mtx;
+#if 0
+	int				visibility[MAX_NBR_WTAP];
+	struct stailhead 		*headp;
+	packet_head			pktbuf;
+	STAILQ_HEAD(stailhead, packet) pktbuf;
+	STAILQ_HEAD(stailhead, packet) pktbuf;
+	/* = STAILQ_HEAD_INITIALIZER(head); */
+#endif
+	/* 0 means we drop packets, 1 we queue them */
+	int				open;
+	md_pkthead			md_pktbuf;	/* master queue */
+	struct eventhandler		*tx_handler;
+	struct timehandler		*bc_handler;
+};
+
+extern	void init_medium(struct wtap_medium *);
+extern	void deinit_medium(struct wtap_medium *);
+extern	void medium_open(struct wtap_medium *);
+extern	void medium_close(struct wtap_medium *);
+extern	int medium_transmit(struct wtap_medium *, int id, struct mbuf*);
+extern	struct packet *medium_get_next_packet(struct wtap_medium *);
+
+#endif	/* __DEV_WTAP_MEDIUM_H__ */