mirror of
https://github.com/freebsd/freebsd-src
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2a9e17ce8e
entry point, which is no longer required now that we don't support old-style multicast tunnels. This removes the last mbuf object class entry point that isn't init/copy/destroy. Obtained from: TrustedBSD Project
450 lines
10 KiB
C
450 lines
10 KiB
C
/*-
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* Copyright (c) 1999-2002 Robert N. M. Watson
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* Copyright (c) 2001 Ilmar S. Habibulin
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* Copyright (c) 2001-2004 Networks Associates Technology, Inc.
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* Copyright (c) 2006 SPARTA, Inc.
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* All rights reserved.
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*
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* This software was developed by Robert Watson and Ilmar Habibulin for the
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* TrustedBSD Project.
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*
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* This software was enhanced by SPARTA ISSO under SPAWAR contract
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* N66001-04-C-6019 ("SEFOS").
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*
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* This software was developed for the FreeBSD Project in part by Network
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* Associates Laboratories, the Security Research Division of Network
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* Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
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* as part of the DARPA CHATS research program.
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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 AUTHOR 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 AUTHOR 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_mac.h"
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mutex.h>
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#include <sys/mac.h>
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#include <sys/priv.h>
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#include <sys/sbuf.h>
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#include <sys/systm.h>
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#include <sys/mount.h>
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#include <sys/file.h>
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#include <sys/namei.h>
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#include <sys/protosw.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/sysctl.h>
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#include <net/bpfdesc.h>
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#include <net/if.h>
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#include <net/if_var.h>
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#include <security/mac/mac_framework.h>
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#include <security/mac/mac_internal.h>
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#include <security/mac/mac_policy.h>
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/*
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* XXXRW: struct ifnet locking is incomplete in the network code, so we use
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* our own global mutex for struct ifnet. Non-ideal, but should help in the
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* SMP environment.
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*/
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struct mtx mac_ifnet_mtx;
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MTX_SYSINIT(mac_ifnet_mtx, &mac_ifnet_mtx, "mac_ifnet", MTX_DEF);
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/*
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* Retrieve the label associated with an mbuf by searching for the tag.
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* Depending on the value of mac_labelmbufs, it's possible that a label will
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* not be present, in which case NULL is returned. Policies must handle the
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* possibility of an mbuf not having label storage if they do not enforce
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* early loading.
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*/
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struct label *
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mac_mbuf_to_label(struct mbuf *m)
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{
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struct m_tag *tag;
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struct label *label;
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if (m == NULL)
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return (NULL);
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tag = m_tag_find(m, PACKET_TAG_MACLABEL, NULL);
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if (tag == NULL)
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return (NULL);
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label = (struct label *)(tag+1);
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return (label);
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}
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static struct label *
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mac_bpfdesc_label_alloc(void)
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{
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struct label *label;
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label = mac_labelzone_alloc(M_WAITOK);
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MAC_PERFORM(bpfdesc_init_label, label);
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return (label);
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}
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void
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mac_bpfdesc_init(struct bpf_d *d)
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{
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d->bd_label = mac_bpfdesc_label_alloc();
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}
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static struct label *
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mac_ifnet_label_alloc(void)
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{
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struct label *label;
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label = mac_labelzone_alloc(M_WAITOK);
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MAC_PERFORM(ifnet_init_label, label);
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return (label);
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}
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void
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mac_ifnet_init(struct ifnet *ifp)
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{
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ifp->if_label = mac_ifnet_label_alloc();
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}
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int
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mac_mbuf_tag_init(struct m_tag *tag, int flag)
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{
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struct label *label;
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int error;
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label = (struct label *) (tag + 1);
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mac_init_label(label);
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MAC_CHECK(mbuf_init_label, label, flag);
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if (error) {
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MAC_PERFORM(mbuf_destroy_label, label);
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mac_destroy_label(label);
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}
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return (error);
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}
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int
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mac_mbuf_init(struct mbuf *m, int flag)
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{
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struct m_tag *tag;
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int error;
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M_ASSERTPKTHDR(m);
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#ifndef MAC_ALWAYS_LABEL_MBUF
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/*
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* If conditionally allocating mbuf labels, don't allocate unless
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* they are required.
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*/
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if (!mac_labelmbufs)
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return (0);
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#endif
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tag = m_tag_get(PACKET_TAG_MACLABEL, sizeof(struct label),
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flag);
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if (tag == NULL)
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return (ENOMEM);
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error = mac_mbuf_tag_init(tag, flag);
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if (error) {
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m_tag_free(tag);
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return (error);
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}
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m_tag_prepend(m, tag);
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return (0);
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}
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static void
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mac_bpfdesc_label_free(struct label *label)
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{
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MAC_PERFORM(bpfdesc_destroy_label, label);
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mac_labelzone_free(label);
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}
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void
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mac_bpfdesc_destroy(struct bpf_d *d)
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{
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mac_bpfdesc_label_free(d->bd_label);
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d->bd_label = NULL;
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}
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static void
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mac_ifnet_label_free(struct label *label)
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{
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MAC_PERFORM(ifnet_destroy_label, label);
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mac_labelzone_free(label);
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}
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void
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mac_ifnet_destroy(struct ifnet *ifp)
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{
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mac_ifnet_label_free(ifp->if_label);
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ifp->if_label = NULL;
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}
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void
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mac_mbuf_tag_destroy(struct m_tag *tag)
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{
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struct label *label;
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label = (struct label *)(tag+1);
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MAC_PERFORM(mbuf_destroy_label, label);
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mac_destroy_label(label);
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}
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/*
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* mac_mbuf_tag_copy is called when an mbuf header is duplicated, in which
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* case the labels must also be duplicated.
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*/
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void
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mac_mbuf_tag_copy(struct m_tag *src, struct m_tag *dest)
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{
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struct label *src_label, *dest_label;
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src_label = (struct label *)(src+1);
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dest_label = (struct label *)(dest+1);
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/*
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* mac_mbuf_tag_init() is called on the target tag in m_tag_copy(),
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* so we don't need to call it here.
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*/
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MAC_PERFORM(mbuf_copy_label, src_label, dest_label);
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}
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void
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mac_mbuf_copy(struct mbuf *m_from, struct mbuf *m_to)
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{
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struct label *src_label, *dest_label;
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src_label = mac_mbuf_to_label(m_from);
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dest_label = mac_mbuf_to_label(m_to);
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MAC_PERFORM(mbuf_copy_label, src_label, dest_label);
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}
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static void
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mac_ifnet_copy_label(struct label *src, struct label *dest)
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{
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MAC_PERFORM(ifnet_copy_label, src, dest);
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}
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static int
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mac_ifnet_externalize_label(struct label *label, char *elements,
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char *outbuf, size_t outbuflen)
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{
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int error;
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MAC_EXTERNALIZE(ifnet, label, elements, outbuf, outbuflen);
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return (error);
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}
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static int
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mac_ifnet_internalize_label(struct label *label, char *string)
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{
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int error;
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MAC_INTERNALIZE(ifnet, label, string);
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return (error);
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}
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void
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mac_ifnet_create(struct ifnet *ifp)
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{
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MAC_IFNET_LOCK(ifp);
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MAC_PERFORM(ifnet_create, ifp, ifp->if_label);
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MAC_IFNET_UNLOCK(ifp);
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}
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void
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mac_bpfdesc_create(struct ucred *cred, struct bpf_d *d)
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{
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MAC_PERFORM(bpfdesc_create, cred, d, d->bd_label);
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}
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void
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mac_bpfdesc_create_mbuf(struct bpf_d *d, struct mbuf *m)
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{
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struct label *label;
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BPFD_LOCK_ASSERT(d);
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label = mac_mbuf_to_label(m);
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MAC_PERFORM(bpfdesc_create_mbuf, d, d->bd_label, m, label);
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}
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void
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mac_ifnet_create_mbuf(struct ifnet *ifp, struct mbuf *m)
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{
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struct label *label;
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label = mac_mbuf_to_label(m);
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MAC_IFNET_LOCK(ifp);
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MAC_PERFORM(ifnet_create_mbuf, ifp, ifp->if_label, m, label);
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MAC_IFNET_UNLOCK(ifp);
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}
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int
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mac_bpfdesc_check_receive(struct bpf_d *d, struct ifnet *ifp)
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{
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int error;
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BPFD_LOCK_ASSERT(d);
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MAC_IFNET_LOCK(ifp);
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MAC_CHECK(bpfdesc_check_receive, d, d->bd_label, ifp, ifp->if_label);
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MAC_IFNET_UNLOCK(ifp);
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return (error);
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}
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int
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mac_ifnet_check_transmit(struct ifnet *ifp, struct mbuf *m)
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{
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struct label *label;
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int error;
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M_ASSERTPKTHDR(m);
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label = mac_mbuf_to_label(m);
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MAC_IFNET_LOCK(ifp);
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MAC_CHECK(ifnet_check_transmit, ifp, ifp->if_label, m, label);
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MAC_IFNET_UNLOCK(ifp);
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return (error);
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}
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int
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mac_ifnet_ioctl_get(struct ucred *cred, struct ifreq *ifr,
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struct ifnet *ifp)
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{
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char *elements, *buffer;
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struct label *intlabel;
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struct mac mac;
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int error;
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error = copyin(ifr->ifr_ifru.ifru_data, &mac, sizeof(mac));
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if (error)
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return (error);
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error = mac_check_structmac_consistent(&mac);
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if (error)
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return (error);
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elements = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK);
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error = copyinstr(mac.m_string, elements, mac.m_buflen, NULL);
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if (error) {
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free(elements, M_MACTEMP);
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return (error);
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}
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buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK | M_ZERO);
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intlabel = mac_ifnet_label_alloc();
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MAC_IFNET_LOCK(ifp);
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mac_ifnet_copy_label(ifp->if_label, intlabel);
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MAC_IFNET_UNLOCK(ifp);
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error = mac_ifnet_externalize_label(intlabel, elements, buffer,
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mac.m_buflen);
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mac_ifnet_label_free(intlabel);
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if (error == 0)
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error = copyout(buffer, mac.m_string, strlen(buffer)+1);
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free(buffer, M_MACTEMP);
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free(elements, M_MACTEMP);
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return (error);
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}
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int
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mac_ifnet_ioctl_set(struct ucred *cred, struct ifreq *ifr, struct ifnet *ifp)
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{
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struct label *intlabel;
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struct mac mac;
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char *buffer;
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int error;
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error = copyin(ifr->ifr_ifru.ifru_data, &mac, sizeof(mac));
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if (error)
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return (error);
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error = mac_check_structmac_consistent(&mac);
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if (error)
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return (error);
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buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK);
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error = copyinstr(mac.m_string, buffer, mac.m_buflen, NULL);
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if (error) {
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free(buffer, M_MACTEMP);
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return (error);
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}
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intlabel = mac_ifnet_label_alloc();
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error = mac_ifnet_internalize_label(intlabel, buffer);
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free(buffer, M_MACTEMP);
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if (error) {
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mac_ifnet_label_free(intlabel);
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return (error);
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}
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/*
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* XXX: Note that this is a redundant privilege check, since policies
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* impose this check themselves if required by the policy
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* Eventually, this should go away.
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*/
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error = priv_check_cred(cred, PRIV_NET_SETIFMAC, 0);
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if (error) {
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mac_ifnet_label_free(intlabel);
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return (error);
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}
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MAC_IFNET_LOCK(ifp);
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MAC_CHECK(ifnet_check_relabel, cred, ifp, ifp->if_label, intlabel);
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if (error) {
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MAC_IFNET_UNLOCK(ifp);
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mac_ifnet_label_free(intlabel);
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return (error);
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}
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MAC_PERFORM(ifnet_relabel, cred, ifp, ifp->if_label, intlabel);
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MAC_IFNET_UNLOCK(ifp);
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mac_ifnet_label_free(intlabel);
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return (0);
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}
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