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Konstantin Belousov
6fa205a623
The option, when set, disables bypassing the unix socket vnode down to the lower mp, effectively preventing connection to nullfs unix socket from being acceptable from the lower mp (and vice versa). This is done by providing a vop vector that stops bypass for unp-related VOPs. I believe that VFS_VOP_VECTOR_REGISTER() does the right thing there regardless of the order of initialization. Reviewed by: markj Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D52983
108 lines
3.6 KiB
C
108 lines
3.6 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software donated to Berkeley by
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* Jan-Simon Pendry.
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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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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT 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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#ifndef FS_NULL_H
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#define FS_NULL_H
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#include <sys/ck.h>
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#include <vm/uma.h>
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#define NULLM_CACHE 0x0001
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#define NULLM_NOUNPBYPASS 0x0002
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struct null_mount {
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struct mount *nullm_vfs;
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struct vnode *nullm_lowerrootvp; /* Ref to lower root vnode */
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uint64_t nullm_flags;
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struct mount_upper_node upper_node;
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struct mount_upper_node notify_node;
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};
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#ifdef _KERNEL
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/*
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* A cache of vnode references
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*/
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struct null_node {
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CK_SLIST_ENTRY(null_node) null_hash; /* Hash list */
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struct vnode *null_lowervp; /* VREFed once */
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struct vnode *null_vnode; /* Back pointer */
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u_int null_flags;
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};
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#define NULLV_NOUNLOCK 0x0001
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#define NULLV_DROP 0x0002
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#define MOUNTTONULLMOUNT(mp) ((struct null_mount *)((mp)->mnt_data))
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#define VTONULL(vp) ((struct null_node *)(vp)->v_data)
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#define VTONULL_SMR(vp) ((struct null_node *)vn_load_v_data_smr(vp))
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#define NULLTOV(xp) ((xp)->null_vnode)
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int nullfs_init(struct vfsconf *vfsp);
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int nullfs_uninit(struct vfsconf *vfsp);
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int null_nodeget(struct mount *mp, struct vnode *target, struct vnode **vpp);
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struct vnode *null_hashget(struct mount *mp, struct vnode *lowervp);
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void null_hashrem(struct null_node *xp);
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int null_bypass(struct vop_generic_args *ap);
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#ifdef DIAGNOSTIC
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struct vnode *null_checkvp(struct vnode *vp, char *fil, int lno);
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#define NULLVPTOLOWERVP(vp) null_checkvp((vp), __FILE__, __LINE__)
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#else
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#define NULLVPTOLOWERVP(vp) (VTONULL(vp)->null_lowervp)
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#endif
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extern struct vop_vector null_vnodeops;
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extern struct vop_vector null_vnodeops_no_unp_bypass;
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static inline bool
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null_is_nullfs_vnode(struct vnode *vp)
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{
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const struct vop_vector *op;
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op = vp->v_op;
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return (op == &null_vnodeops || op == &null_vnodeops_no_unp_bypass);
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}
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extern uma_zone_t null_node_zone;
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#ifdef NULLFS_DEBUG
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#define NULLFSDEBUG(format, args...) printf(format ,## args)
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#else
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#define NULLFSDEBUG(format, args...)
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#endif /* NULLFS_DEBUG */
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#endif /* _KERNEL */
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#endif
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