7a1c0b1ad1
than removing the network interfaces first. This change is rather larger
and convoluted as the ordering requirements cannot be separated.
Move the pfil(9) framework to SI_SUB_PROTO_PFIL, move Firewalls and
related modules to their own SI_SUB_PROTO_FIREWALL.
Move initialization of "physical" interfaces to SI_SUB_DRIVERS,
move virtual (cloned) interfaces to SI_SUB_PSEUDO.
Move Multicast to SI_SUB_PROTO_MC.
Re-work parts of multicast initialisation and teardown, not taking the
huge amount of memory into account if used as a module yet.
For interface teardown we try to do as many of them as we can on
SI_SUB_INIT_IF, but for some this makes no sense, e.g., when tunnelling
over a higher layer protocol such as IP. In that case the interface
has to go along (or before) the higher layer protocol is shutdown.
Kernel hhooks need to go last on teardown as they may be used at various
higher layers and we cannot remove them before we cleaned up the higher
layers.
For interface teardown there are multiple paths:
(a) a cloned interface is destroyed (inside a VIMAGE or in the base system),
(b) any interface is moved from a virtual network stack to a different
network stack ("vmove"), or (c) a virtual network stack is being shut down.
All code paths go through if_detach_internal() where we, depending on the
vmove flag or the vnet state, make a decision on how much to shut down;
in case we are destroying a VNET the individual protocol layers will
cleanup their own parts thus we cannot do so again for each interface as
we end up with, e.g., double-frees, destroying locks twice or acquiring
already destroyed locks.
When calling into protocol cleanups we equally have to tell them
whether they need to detach upper layer protocols ("ulp") or not
(e.g., in6_ifdetach()).
Provide or enahnce helper functions to do proper cleanup at a protocol
rather than at an interface level.
Approved by: re (hrs)
Obtained from: projects/vnet
Reviewed by: gnn, jhb
Sponsored by: The FreeBSD Foundation
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D6747
447 lines
10 KiB
C
447 lines
10 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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* 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_inet.h"
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#include "opt_inet6.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/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_var.h>
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#include <net/if_clone.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/vnet.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 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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#include <security/mac/mac_framework.h>
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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 LO_CSUM_FEATURES (CSUM_IP | CSUM_TCP | CSUM_UDP | CSUM_SCTP)
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#define LO_CSUM_FEATURES6 (CSUM_TCP_IPV6 | CSUM_UDP_IPV6 | CSUM_SCTP_IPV6)
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#define LO_CSUM_SET (CSUM_DATA_VALID | CSUM_DATA_VALID_IPV6 | \
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CSUM_PSEUDO_HDR | \
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CSUM_IP_CHECKED | CSUM_IP_VALID | \
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CSUM_SCTP_VALID)
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int loioctl(struct ifnet *, u_long, caddr_t);
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int looutput(struct ifnet *ifp, struct mbuf *m,
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const struct sockaddr *dst, struct route *ro);
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static int lo_clone_create(struct if_clone *, int, caddr_t);
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static void lo_clone_destroy(struct ifnet *);
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VNET_DEFINE(struct ifnet *, loif); /* Used externally */
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#ifdef VIMAGE
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static VNET_DEFINE(struct if_clone *, lo_cloner);
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#define V_lo_cloner VNET(lo_cloner)
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#endif
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static struct if_clone *lo_cloner;
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static const char loname[] = "lo";
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static void
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lo_clone_destroy(struct ifnet *ifp)
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{
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#ifndef VIMAGE
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/* XXX: destroying lo0 will lead to panics. */
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KASSERT(V_loif != ifp, ("%s: destroying lo0", __func__));
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#endif
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bpfdetach(ifp);
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if_detach(ifp);
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if_free(ifp);
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}
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static int
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lo_clone_create(struct if_clone *ifc, int unit, caddr_t params)
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{
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struct ifnet *ifp;
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ifp = if_alloc(IFT_LOOP);
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if (ifp == NULL)
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return (ENOSPC);
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if_initname(ifp, loname, unit);
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ifp->if_mtu = LOMTU;
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ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST;
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ifp->if_ioctl = loioctl;
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ifp->if_output = looutput;
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ifp->if_snd.ifq_maxlen = ifqmaxlen;
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ifp->if_capabilities = ifp->if_capenable =
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IFCAP_HWCSUM | IFCAP_HWCSUM_IPV6;
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ifp->if_hwassist = LO_CSUM_FEATURES | LO_CSUM_FEATURES6;
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if_attach(ifp);
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bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
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if (V_loif == NULL)
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V_loif = ifp;
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return (0);
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}
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static void
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vnet_loif_init(const void *unused __unused)
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{
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#ifdef VIMAGE
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lo_cloner = if_clone_simple(loname, lo_clone_create, lo_clone_destroy,
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1);
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V_lo_cloner = lo_cloner;
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#else
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lo_cloner = if_clone_simple(loname, lo_clone_create, lo_clone_destroy,
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1);
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#endif
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}
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VNET_SYSINIT(vnet_loif_init, SI_SUB_PSEUDO, SI_ORDER_ANY,
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vnet_loif_init, NULL);
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#ifdef VIMAGE
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static void
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vnet_loif_uninit(const void *unused __unused)
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{
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if_clone_detach(V_lo_cloner);
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V_loif = NULL;
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}
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VNET_SYSUNINIT(vnet_loif_uninit, SI_SUB_INIT_IF, SI_ORDER_SECOND,
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vnet_loif_uninit, NULL);
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#endif
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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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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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default:
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return (EOPNOTSUPP);
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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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"if_lo",
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loop_modevent,
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0
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};
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DECLARE_MODULE(if_lo, loop_mod, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY);
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int
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looutput(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
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struct route *ro)
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{
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u_int32_t af;
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#ifdef MAC
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int error;
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#endif
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M_ASSERTPKTHDR(m); /* check if we have the packet header */
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#ifdef MAC
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error = mac_ifnet_check_transmit(ifp, m);
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if (error) {
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m_freem(m);
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return (error);
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}
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#endif
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if (ro != NULL && ro->ro_flags & (RT_REJECT|RT_BLACKHOLE)) {
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m_freem(m);
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return (ro->ro_flags & RT_BLACKHOLE ? 0 : EHOSTUNREACH);
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}
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if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
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if_inc_counter(ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len);
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/* BPF writes need to be handled specially. */
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if (dst->sa_family == AF_UNSPEC || dst->sa_family == pseudo_AF_HDRCMPLT)
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bcopy(dst->sa_data, &af, sizeof(af));
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else
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af = dst->sa_family;
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#if 1 /* XXX */
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switch (af) {
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case AF_INET:
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if (ifp->if_capenable & IFCAP_RXCSUM) {
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m->m_pkthdr.csum_data = 0xffff;
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m->m_pkthdr.csum_flags = LO_CSUM_SET;
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}
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m->m_pkthdr.csum_flags &= ~LO_CSUM_FEATURES;
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break;
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case AF_INET6:
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#if 0
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/*
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* XXX-BZ for now always claim the checksum is good despite
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* any interface flags. This is a workaround for 9.1-R and
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* a proper solution ought to be sought later.
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*/
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if (ifp->if_capenable & IFCAP_RXCSUM_IPV6) {
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m->m_pkthdr.csum_data = 0xffff;
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m->m_pkthdr.csum_flags = LO_CSUM_SET;
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}
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#else
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m->m_pkthdr.csum_data = 0xffff;
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m->m_pkthdr.csum_flags = LO_CSUM_SET;
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#endif
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m->m_pkthdr.csum_flags &= ~LO_CSUM_FEATURES6;
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break;
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default:
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printf("looutput: af=%d unexpected\n", af);
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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, af, 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(struct ifnet *ifp, struct mbuf *m, int af, int hlen)
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{
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int isr;
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M_ASSERTPKTHDR(m);
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m_tag_delete_nonpersistent(m);
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m->m_pkthdr.rcvif = ifp;
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#ifdef MAC
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mac_ifnet_create_mbuf(ifp, m);
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#endif
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/*
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* Let BPF see incoming packet in the following manner:
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* - Emulated packet loopback for a simplex interface
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* (net/if_ethersubr.c)
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* -> passes it to ifp's BPF
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* - IPv4/v6 multicast packet loopback (netinet(6)/ip(6)_output.c)
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* -> not passes it to any BPF
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* - Normal packet loopback from myself to myself (net/if_loop.c)
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* -> passes to lo0's BPF (even in case of IPv6, where ifp!=lo0)
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*/
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if (hlen > 0) {
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if (bpf_peers_present(ifp->if_bpf)) {
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bpf_mtap(ifp->if_bpf, m);
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}
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} else {
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if (bpf_peers_present(V_loif->if_bpf)) {
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if ((m->m_flags & M_MCAST) == 0 || V_loif == ifp) {
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/* XXX beware sizeof(af) != 4 */
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u_int32_t af1 = af;
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/*
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* We need to prepend the address family.
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*/
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bpf_mtap2(V_loif->if_bpf, &af1, sizeof(af1), m);
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}
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}
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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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#ifndef __NO_STRICT_ALIGNMENT
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/*
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* Some archs do not like unaligned data, so
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* we move data down in the first mbuf.
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*/
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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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m->m_data -= (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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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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if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
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if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
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netisr_queue(isr, m); /* mbuf is free'd on failure. */
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return (0);
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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(struct ifnet *ifp, u_long cmd, caddr_t data)
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{
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struct ifreq *ifr = (struct ifreq *)data;
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int error = 0, mask;
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switch (cmd) {
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case SIOCSIFADDR:
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ifp->if_flags |= IFF_UP;
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ifp->if_drv_flags |= IFF_DRV_RUNNING;
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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 == NULL) {
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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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case SIOCSIFCAP:
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mask = ifp->if_capenable ^ ifr->ifr_reqcap;
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if ((mask & IFCAP_RXCSUM) != 0)
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ifp->if_capenable ^= IFCAP_RXCSUM;
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if ((mask & IFCAP_TXCSUM) != 0)
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ifp->if_capenable ^= IFCAP_TXCSUM;
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if ((mask & IFCAP_RXCSUM_IPV6) != 0) {
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#if 0
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ifp->if_capenable ^= IFCAP_RXCSUM_IPV6;
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#else
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error = EOPNOTSUPP;
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break;
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#endif
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}
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if ((mask & IFCAP_TXCSUM_IPV6) != 0) {
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#if 0
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ifp->if_capenable ^= IFCAP_TXCSUM_IPV6;
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#else
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error = EOPNOTSUPP;
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break;
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#endif
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}
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ifp->if_hwassist = 0;
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if (ifp->if_capenable & IFCAP_TXCSUM)
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ifp->if_hwassist = LO_CSUM_FEATURES;
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#if 0
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if (ifp->if_capenable & IFCAP_TXCSUM_IPV6)
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ifp->if_hwassist |= LO_CSUM_FEATURES6;
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#endif
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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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