119 lines
4.9 KiB
C
119 lines
4.9 KiB
C
/* $NetBSD: if_vlanvar.h,v 1.17 2022/06/20 08:02:25 yamaguchi Exp $ */
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/*
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* Copyright (c) 2000 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Andrew Doran.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Copyright 1998 Massachusetts Institute of Technology
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*
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* Permission to use, copy, modify, and distribute this software and
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* its documentation for any purpose and without fee is hereby
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* granted, provided that both the above copyright notice and this
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* permission notice appear in all copies, that both the above
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* copyright notice and this permission notice appear in all
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* supporting documentation, and that the name of M.I.T. not be used
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* in advertising or publicity pertaining to distribution of the
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* software without specific, written prior permission. M.I.T. makes
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* no representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied
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* warranty.
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*
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* THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
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* ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
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* SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from FreeBSD: if_vlan_var.h,v 1.3 1999/08/28 00:48:24 peter Exp
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*/
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#ifndef _NET_IF_VLANVAR_H_
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#define _NET_IF_VLANVAR_H_
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struct ether_vlan_header {
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uint8_t evl_dhost[ETHER_ADDR_LEN];
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uint8_t evl_shost[ETHER_ADDR_LEN];
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uint16_t evl_encap_proto;
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uint16_t evl_tag;
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uint16_t evl_proto;
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} __packed;
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/* Configuration structure for SIOCSETVLAN and SIOCGETVLAN ioctls. */
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struct vlanreq {
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char vlr_parent[IFNAMSIZ];
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uint16_t vlr_tag;
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};
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#define SIOCSETVLAN SIOCSIFGENERIC
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#define SIOCGETVLAN SIOCGIFGENERIC
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#ifdef _KERNEL
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struct mbuf * vlan_input(struct ifnet *, struct mbuf *);
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/*
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* Locking notes:
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* + ifv_list.list is protected by ifv_list.lock (an adaptive mutex)
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* ifv_list.list is list of all ifvlans, and it is used to avoid
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* unload while busy.
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* + ifv_hash.lists is protected by
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* - ifv_hash.lock (an adaptive mutex) for writer
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* - pserialize for reader
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* ifv_hash.lists is hashed list of all configured
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* vlan interface, and it is used to avoid unload while busy.
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* + ifvlan->ifv_linkmib is protected by
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* - ifvlan->ifv_lock (an adaptive mutex) for writer
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* - ifv_linkmib->ifvm_psref for reader
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* ifvlan->ifv_linkmib is used for variant values while tagging
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* and untagging
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*
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* Locking order:
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* - ifv_list.lock => struct ifvlan->ifv_lock
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* - struct ifvlan->ifv_lock => ifv_hash.lock
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* Other mutexes must not hold simultaneously
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*
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* NOTICE
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* - ifvlan must not have a variant value while tagging and
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* untagging. Such variant values must be in ifvlan->ifv_mib
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* - ifvlan->ifv_mib is modified like read-copy-update.
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* So, once we dereference ifvlan->ifv_mib,
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* we must keep the pointer during the same context. If we
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* re-dereference ifvlan->ifv_mib, the ifv_mib may be other
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* one because of concurrent writer processing.
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*/
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#endif /* _KERNEL */
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#endif /* !_NET_IF_VLANVAR_H_ */
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