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+/*
+ * Mach Operating System
+ * Copyright (c) 1991,1990,1989 Carnegie Mellon University
+ * All Rights Reserved.
+ *
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ *
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
+ * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ *
+ * Carnegie Mellon requests users of this software to return to
+ *
+ * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
+ * School of Computer Science
+ * Carnegie Mellon University
+ * Pittsburgh PA 15213-3890
+ *
+ * any improvements or extensions that they make and grant Carnegie Mellon
+ * the rights to redistribute these changes.
+ */
+/*
+ * Taken from (bsd)net/if.h. Modified for MACH kernel.
+ */
+/*
+ * Copyright (c) 1982, 1986 Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that the above copyright notice and this paragraph are
+ * duplicated in all such forms and that any documentation,
+ * advertising materials, and other materials related to such
+ * distribution and use acknowledge that the software was developed
+ * by the University of California, Berkeley. The name of the
+ * University may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * @(#)if.h 7.3 (Berkeley) 6/27/88
+ */
+
+#ifndef _IF_HDR_
+#define _IF_HDR_
+
+#include <kern/lock.h>
+#include <kern/queue.h>
+
+/*
+ * Queue for network output and filter input.
+ */
+struct ifqueue {
+ queue_head_t ifq_head; /* queue of io_req_t */
+ int ifq_len; /* length of queue */
+ int ifq_maxlen; /* maximum length of queue */
+ int ifq_drops; /* number of packets dropped
+ because queue full */
+ decl_simple_lock_data(,
+ ifq_lock) /* lock for queue and counters */
+};
+
+/*
+ * Header for network interface drivers.
+ */
+struct ifnet {
+ short if_unit; /* unit number */
+ short if_flags; /* up/down, broadcast, etc. */
+ short if_timer; /* time until if_watchdog called */
+ short if_mtu; /* maximum transmission unit */
+ short if_header_size; /* length of header */
+ short if_header_format; /* format of hardware header */
+ short if_address_size; /* length of hardware address */
+ short if_alloc_size; /* size of read buffer to allocate */
+ char *if_address; /* pointer to hardware address */
+ struct ifqueue if_snd; /* output queue */
+ queue_head_t if_rcv_port_list; /* input filter list */
+ decl_simple_lock_data(,
+ if_rcv_port_list_lock) /* lock for filter list */
+/* statistics */
+ int if_ipackets; /* packets received */
+ int if_ierrors; /* input errors */
+ int if_opackets; /* packets sent */
+ int if_oerrors; /* output errors */
+ int if_collisions; /* collisions on csma interfaces */
+ int if_rcvdrops; /* packets received but dropped */
+};
+
+#define IFF_UP 0x0001 /* interface is up */
+#define IFF_BROADCAST 0x0002 /* interface can broadcast */
+#define IFF_DEBUG 0x0004 /* turn on debugging */
+#define IFF_LOOPBACK 0x0008 /* is a loopback net */
+#define IFF_POINTOPOINT 0x0010 /* point-to-point link */
+#define IFF_RUNNING 0x0040 /* resources allocated */
+#define IFF_NOARP 0x0080 /* no address resolution protocol */
+#define IFF_PROMISC 0x0100 /* receive all packets */
+#define IFF_ALLMULTI 0x0200 /* receive all multicast packets */
+#define IFF_BRIDGE 0x0100 /* support token ring routing field */
+#define IFF_SNAP 0x0200 /* support extended sap header */
+
+/* internal flags only: */
+#define IFF_CANTCHANGE (IFF_BROADCAST | IFF_POINTOPOINT | IFF_RUNNING)
+
+/*
+ * Output queues (ifp->if_snd)
+ * have queues of messages stored on ifqueue structures. Entries
+ * are added to and deleted from these structures by these macros, which
+ * should be called with ipl raised to splimp().
+ * XXX locking XXX
+ */
+
+#define IF_QFULL(ifq) ((ifq)->ifq_len >= (ifq)->ifq_maxlen)
+#define IF_DROP(ifq) ((ifq)->ifq_drops++)
+#define IF_ENQUEUE(ifq, ior) { \
+ simple_lock(&(ifq)->ifq_lock); \
+ enqueue_tail(&(ifq)->ifq_head, (queue_entry_t)ior); \
+ (ifq)->ifq_len++; \
+ simple_unlock(&(ifq)->ifq_lock); \
+}
+#define IF_PREPEND(ifq, ior) { \
+ simple_lock(&(ifq)->ifq_lock); \
+ enqueue_head(&(ifq)->ifq_head, (queue_entry_t)ior); \
+ (ifq)->ifq_len++; \
+ simple_unlock(&(ifq)->ifq_lock); \
+}
+
+#define IF_DEQUEUE(ifq, ior) { \
+ simple_lock(&(ifq)->ifq_lock); \
+ if (((ior) = (io_req_t)dequeue_head(&(ifq)->ifq_head)) != 0) \
+ (ifq)->ifq_len--; \
+ simple_unlock(&(ifq)->ifq_lock); \
+}
+
+#define IFQ_MAXLEN 50
+
+#define IFQ_INIT(ifq) { \
+ queue_init(&(ifq)->ifq_head); \
+ simple_lock_init(&(ifq)->ifq_lock); \
+ (ifq)->ifq_len = 0; \
+ (ifq)->ifq_maxlen = IFQ_MAXLEN; \
+ (ifq)->ifq_drops = 0; \
+}
+
+#define IFNET_SLOWHZ 1 /* granularity is 1 second */
+
+#endif _IF_HDR_