225bff6f8b
returning some additional room in the first mbuf in a chain, and avoiding feature-specific contents in the mbuf header. To do this: - Modify mbuf_to_label() to extract the tag, returning NULL if not found. - Introduce mac_init_mbuf_tag() which does most of the work mac_init_mbuf() used to do, except on an m_tag rather than an mbuf. - Scale back mac_init_mbuf() to perform m_tag allocation and invoke mac_init_mbuf_tag(). - Replace mac_destroy_mbuf() with mac_destroy_mbuf_tag(), since m_tag's are now GC'd deep in the m_tag/mbuf code rather than at a higher level when mbufs are directly free()'d. - Add mac_copy_mbuf_tag() to support m_copy_pkthdr() and related notions. - Generally change all references to mbuf labels so that they use mbuf_to_label() rather than &mbuf->m_pkthdr.label. This required no changes in the MAC policies (yay!). - Tweak mbuf release routines to not call mac_destroy_mbuf(), tag destruction takes care of it for us now. - Remove MAC magic from m_copy_pkthdr() and m_move_pkthdr() -- the existing m_tag support does all this for us. Note that we can no longer just zero the m_tag list on the target mbuf, rather, we have to delete the chain because m_tag's will already be hung off freshly allocated mbuf's. - Tweak m_tag copying routines so that if we're copying a MAC m_tag, we don't do a binary copy, rather, we initialize the new storage and do a deep copy of the label. - Remove use of MAC_FLAG_INITIALIZED in a few bizarre places having to do with mbuf header copies previously. - When an mbuf is copied in ip_input(), we no longer need to explicitly copy the label because it will get handled by the m_tag code now. - No longer any weird handling of MAC labels in if_loop.c during header copies. - Add MPC_LOADTIME_FLAG_LABELMBUFS flag to Biba, MLS, mac_test. In mac_test, handle the label==NULL case, since it can be dynamically loaded. In order to improve performance with this change, introduce the notion of "lazy MAC label allocation" -- only allocate m_tag storage for MAC labels if we're running with a policy that uses MAC labels on mbufs. Policies declare this intent by setting the MPC_LOADTIME_FLAG_LABELMBUFS flag in their load-time flags field during declaration. Note: this opens up the possibility of post-boot policy modules getting back NULL slot entries even though they have policy invariants of non-NULL slot entries, as the policy might have been loaded after the mbuf was allocated, leaving the mbuf without label storage. Policies that cannot handle this case must be declared as NOTLATE, or must be modified. - mac_labelmbufs holds the current cumulative status as to whether any policies require mbuf labeling or not. This is updated whenever the active policy set changes by the function mac_policy_updateflags(). The function iterates the list and checks whether any have the flag set. Write access to this variable is protected by the policy list; read access is currently not protected for performance reasons. This might change if it causes problems. - Add MAC_POLICY_LIST_ASSERT_EXCLUSIVE() to permit the flags update function to assert appropriate locks. - This makes allocation in mac_init_mbuf() conditional on the flag. Reviewed by: sam Obtained from: TrustedBSD Project Sponsored by: DARPA, Network Associates Laboratories
433 lines
9.8 KiB
C
433 lines
9.8 KiB
C
/*
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* Copyright (c) 1982, 1986, 1993
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* The Regents of the University of California. All rights reserved.
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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* @(#)if_loop.c 8.2 (Berkeley) 1/9/95
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* $FreeBSD$
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*/
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/*
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* Loopback interface driver for protocol testing and timing.
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*/
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#include "opt_atalk.h"
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include "opt_ipx.h"
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#include "opt_mac.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/mac.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/module.h>
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#include <machine/bus.h>
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#include <sys/rman.h>
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#include <sys/socket.h>
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#include <sys/sockio.h>
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#include <sys/sysctl.h>
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#include <net/if.h>
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#include <net/if_types.h>
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#include <net/netisr.h>
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#include <net/route.h>
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#include <net/bpf.h>
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#include <net/bpfdesc.h>
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#ifdef INET
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#include <netinet/in.h>
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#include <netinet/in_var.h>
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#endif
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#ifdef IPX
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#include <netipx/ipx.h>
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#include <netipx/ipx_if.h>
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#endif
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#ifdef INET6
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#ifndef INET
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#include <netinet/in.h>
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#endif
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#include <netinet6/in6_var.h>
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#include <netinet/ip6.h>
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#endif
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#ifdef NETATALK
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#include <netatalk/at.h>
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#include <netatalk/at_var.h>
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#endif
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#ifdef TINY_LOMTU
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#define LOMTU (1024+512)
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#elif defined(LARGE_LOMTU)
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#define LOMTU 131072
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#else
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#define LOMTU 16384
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#endif
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#define LONAME "lo"
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struct lo_softc {
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struct ifnet sc_if; /* network-visible interface */
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LIST_ENTRY(lo_softc) sc_next;
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};
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int loioctl(struct ifnet *, u_long, caddr_t);
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static void lortrequest(int, struct rtentry *, struct rt_addrinfo *);
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int looutput(struct ifnet *ifp, struct mbuf *m,
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struct sockaddr *dst, struct rtentry *rt);
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int lo_clone_create(struct if_clone *, int);
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void lo_clone_destroy(struct ifnet *);
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struct ifnet *loif = NULL; /* Used externally */
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static MALLOC_DEFINE(M_LO, LONAME, "Loopback Interface");
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static LIST_HEAD(lo_list, lo_softc) lo_list;
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struct if_clone lo_cloner = IF_CLONE_INITIALIZER(LONAME,
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lo_clone_create, lo_clone_destroy, 1, IF_MAXUNIT);
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void
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lo_clone_destroy(ifp)
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struct ifnet *ifp;
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{
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struct lo_softc *sc;
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sc = ifp->if_softc;
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/* XXX: destroying lo0 will lead to panics. */
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KASSERT(loif != ifp, ("%s: destroying lo0", __func__));
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bpfdetach(ifp);
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if_detach(ifp);
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LIST_REMOVE(sc, sc_next);
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free(sc, M_LO);
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}
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int
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lo_clone_create(ifc, unit)
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struct if_clone *ifc;
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int unit;
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{
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struct lo_softc *sc;
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MALLOC(sc, struct lo_softc *, sizeof(*sc), M_LO, M_WAITOK | M_ZERO);
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sc->sc_if.if_name = LONAME;
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sc->sc_if.if_unit = unit;
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sc->sc_if.if_mtu = LOMTU;
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sc->sc_if.if_flags = IFF_LOOPBACK | IFF_MULTICAST;
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sc->sc_if.if_ioctl = loioctl;
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sc->sc_if.if_output = looutput;
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sc->sc_if.if_type = IFT_LOOP;
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sc->sc_if.if_snd.ifq_maxlen = ifqmaxlen;
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sc->sc_if.if_softc = sc;
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if_attach(&sc->sc_if);
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bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int));
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LIST_INSERT_HEAD(&lo_list, sc, sc_next);
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if (loif == NULL)
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loif = &sc->sc_if;
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return (0);
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}
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static int
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loop_modevent(module_t mod, int type, void *data)
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{
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switch (type) {
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case MOD_LOAD:
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LIST_INIT(&lo_list);
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if_clone_attach(&lo_cloner);
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break;
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case MOD_UNLOAD:
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printf("loop module unload - not possible for this module type\n");
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return EINVAL;
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}
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return 0;
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}
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static moduledata_t loop_mod = {
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"loop",
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loop_modevent,
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0
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};
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DECLARE_MODULE(loop, loop_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
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int
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looutput(ifp, m, dst, rt)
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struct ifnet *ifp;
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register struct mbuf *m;
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struct sockaddr *dst;
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register struct rtentry *rt;
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{
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M_ASSERTPKTHDR(m); /* check if we have the packet header */
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if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
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m_freem(m);
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return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
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rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
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}
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/*
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* KAME requires that the packet to be contiguous on the
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* mbuf. We need to make that sure.
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* this kind of code should be avoided.
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* XXX: fails to join if interface MTU > MCLBYTES. jumbogram?
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*/
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if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) {
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struct mbuf *n;
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/* XXX MT_HEADER should be m->m_type */
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MGETHDR(n, M_DONTWAIT, MT_HEADER);
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if (!n)
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goto contiguousfail;
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M_MOVE_PKTHDR(n, m);
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MCLGET(n, M_DONTWAIT);
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if (! (n->m_flags & M_EXT)) {
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m_freem(n);
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goto contiguousfail;
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}
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m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t));
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n->m_len = n->m_pkthdr.len;
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m_freem(m);
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m = n;
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}
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if (0) {
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contiguousfail:
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printf("looutput: mbuf allocation failed\n");
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}
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ifp->if_opackets++;
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ifp->if_obytes += m->m_pkthdr.len;
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#if 1 /* XXX */
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switch (dst->sa_family) {
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case AF_INET:
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case AF_INET6:
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case AF_IPX:
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case AF_APPLETALK:
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break;
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default:
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printf("looutput: af=%d unexpected\n", dst->sa_family);
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m_freem(m);
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return (EAFNOSUPPORT);
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}
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#endif
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return(if_simloop(ifp, m, dst->sa_family, 0));
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}
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/*
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* if_simloop()
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*
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* This function is to support software emulation of hardware loopback,
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* i.e., for interfaces with the IFF_SIMPLEX attribute. Since they can't
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* hear their own broadcasts, we create a copy of the packet that we
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* would normally receive via a hardware loopback.
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*
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* This function expects the packet to include the media header of length hlen.
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*/
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int
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if_simloop(ifp, m, af, hlen)
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struct ifnet *ifp;
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struct mbuf *m;
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int af;
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int hlen;
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{
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int isr;
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M_ASSERTPKTHDR(m);
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m->m_pkthdr.rcvif = ifp;
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/* BPF write needs to be handled specially */
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if (af == AF_UNSPEC) {
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KASSERT(m->m_len >= sizeof(int), ("if_simloop: m_len"));
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af = *(mtod(m, int *));
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m->m_len -= sizeof(int);
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m->m_pkthdr.len -= sizeof(int);
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m->m_data += sizeof(int);
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}
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/* Let BPF see incoming packet */
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if (ifp->if_bpf) {
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struct mbuf m0, *n = m;
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if (ifp->if_bpf->bif_dlt == DLT_NULL) {
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/*
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* We need to prepend the address family as
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* a four byte field. Cons up a dummy header
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* to pacify bpf. This is safe because bpf
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* will only read from the mbuf (i.e., it won't
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* try to free it or keep a pointer a to it).
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*/
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m0.m_next = m;
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m0.m_len = 4;
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m0.m_data = (char *)⁡
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n = &m0;
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}
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BPF_MTAP(ifp, n);
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}
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/* Strip away media header */
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if (hlen > 0) {
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m_adj(m, hlen);
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#if defined(__alpha__) || defined(__ia64__) || defined(__sparc64__)
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/* The alpha doesn't like unaligned data.
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* We move data down in the first mbuf */
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if (mtod(m, vm_offset_t) & 3) {
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KASSERT(hlen >= 3, ("if_simloop: hlen too small"));
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bcopy(m->m_data,
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(char *)(mtod(m, vm_offset_t)
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- (mtod(m, vm_offset_t) & 3)),
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m->m_len);
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mtod(m,vm_offset_t) -= (mtod(m, vm_offset_t) & 3);
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}
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#endif
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}
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/* Deliver to upper layer protocol */
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switch (af) {
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#ifdef INET
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case AF_INET:
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isr = NETISR_IP;
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break;
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#endif
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#ifdef INET6
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case AF_INET6:
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m->m_flags |= M_LOOP;
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isr = NETISR_IPV6;
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break;
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#endif
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#ifdef IPX
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case AF_IPX:
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isr = NETISR_IPX;
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break;
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#endif
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#ifdef NETATALK
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case AF_APPLETALK:
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isr = NETISR_ATALK2;
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break;
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#endif
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default:
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printf("if_simloop: can't handle af=%d\n", af);
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m_freem(m);
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return (EAFNOSUPPORT);
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}
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ifp->if_ipackets++;
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ifp->if_ibytes += m->m_pkthdr.len;
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netisr_dispatch(isr, m);
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return (0);
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}
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/* ARGSUSED */
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static void
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lortrequest(cmd, rt, info)
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int cmd;
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struct rtentry *rt;
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struct rt_addrinfo *info;
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{
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if (rt) {
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rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu; /* for ISO */
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/*
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* For optimal performance, the send and receive buffers
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* should be at least twice the MTU plus a little more for
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* overhead.
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*/
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rt->rt_rmx.rmx_recvpipe =
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rt->rt_rmx.rmx_sendpipe = 3 * LOMTU;
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}
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}
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/*
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* Process an ioctl request.
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*/
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/* ARGSUSED */
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int
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loioctl(ifp, cmd, data)
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register struct ifnet *ifp;
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u_long cmd;
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caddr_t data;
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{
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register struct ifaddr *ifa;
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register struct ifreq *ifr = (struct ifreq *)data;
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register int error = 0;
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switch (cmd) {
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case SIOCSIFADDR:
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ifp->if_flags |= IFF_UP | IFF_RUNNING;
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ifa = (struct ifaddr *)data;
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ifa->ifa_rtrequest = lortrequest;
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/*
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* Everything else is done at a higher level.
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*/
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break;
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case SIOCADDMULTI:
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case SIOCDELMULTI:
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if (ifr == 0) {
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error = EAFNOSUPPORT; /* XXX */
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break;
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}
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switch (ifr->ifr_addr.sa_family) {
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#ifdef INET
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case AF_INET:
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break;
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#endif
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#ifdef INET6
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case AF_INET6:
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break;
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#endif
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default:
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error = EAFNOSUPPORT;
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break;
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}
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break;
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case SIOCSIFMTU:
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ifp->if_mtu = ifr->ifr_mtu;
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break;
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case SIOCSIFFLAGS:
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break;
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default:
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error = EINVAL;
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}
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return (error);
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}
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