bc29160df3
Vnet modules and protocol domains may now register destructor functions to clean up and release per-module state. The destructor mechanisms can be triggered by invoking "vimage -d", or a future equivalent command which will be provided via the new jail framework. While this patch introduces numerous placeholder destructor functions, many of those are currently incomplete, thus leaking memory or (even worse) failing to stop all running timers. Many of such issues are already known and will be incrementaly fixed over the next weeks in smaller incremental commits. Apart from introducing new fields in structs ifnet, domain, protosw and vnet_net, which requires the kernel and modules to be rebuilt, this change should have no impact on nooptions VIMAGE builds, since vnet destructors can only be called in VIMAGE kernels. Moreover, destructor functions should be in general compiled in only in options VIMAGE builds, except for kernel modules which can be safely kldunloaded at run time. Bump __FreeBSD_version to 800097. Reviewed by: bz, julian Approved by: rwatson, kib (re), julian (mentor)
483 lines
11 KiB
C
483 lines
11 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_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_route.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 <sys/vimage.h>
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#include <net/if.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 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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#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_SET (CSUM_DATA_VALID | 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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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 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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static int vnet_loif_iattach(const void *);
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#ifdef VIMAGE
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static int vnet_loif_idetach(const void *);
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#endif
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#ifdef VIMAGE_GLOBALS
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struct ifnet *loif; /* Used externally */
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#endif
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#ifdef VIMAGE
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MALLOC_DEFINE(M_LO_CLONER, "lo_cloner", "lo_cloner");
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#endif
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#ifndef VIMAGE_GLOBALS
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static const vnet_modinfo_t vnet_loif_modinfo = {
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.vmi_id = VNET_MOD_LOIF,
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.vmi_dependson = VNET_MOD_IF_CLONE,
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.vmi_name = "loif",
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.vmi_iattach = vnet_loif_iattach,
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#ifdef VIMAGE
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.vmi_idetach = vnet_loif_idetach
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#endif
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};
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#endif /* !VIMAGE_GLOBALS */
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IFC_SIMPLE_DECLARE(lo, 1);
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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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INIT_VNET_NET(curvnet);
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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, ifc->ifc_name, 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 = IFCAP_HWCSUM;
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ifp->if_hwassist = LO_CSUM_FEATURES;
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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 int
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vnet_loif_iattach(const void *unused __unused)
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{
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INIT_VNET_NET(curvnet);
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V_loif = NULL;
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#ifdef VIMAGE
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V_lo_cloner = malloc(sizeof(*V_lo_cloner), M_LO_CLONER,
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M_WAITOK | M_ZERO);
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V_lo_cloner_data = malloc(sizeof(*V_lo_cloner_data), M_LO_CLONER,
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M_WAITOK | M_ZERO);
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bcopy(&lo_cloner, V_lo_cloner, sizeof(*V_lo_cloner));
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bcopy(lo_cloner.ifc_data, V_lo_cloner_data, sizeof(*V_lo_cloner_data));
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V_lo_cloner->ifc_data = V_lo_cloner_data;
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if_clone_attach(V_lo_cloner);
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#else
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if_clone_attach(&lo_cloner);
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#endif
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return (0);
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}
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#ifdef VIMAGE
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static int
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vnet_loif_idetach(const void *unused __unused)
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{
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INIT_VNET_NET(curvnet);
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if_clone_detach(V_lo_cloner);
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free(V_lo_cloner, M_LO_CLONER);
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free(V_lo_cloner_data, M_LO_CLONER);
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V_loif = NULL;
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return (0);
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}
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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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#ifndef VIMAGE_GLOBALS
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vnet_mod_register(&vnet_loif_modinfo);
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#else
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vnet_loif_iattach(NULL);
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#endif
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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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"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_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY);
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int
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looutput(struct ifnet *ifp, struct mbuf *m, 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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struct rtentry *rt = NULL;
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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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if (ro != NULL)
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rt = ro->ro_rt;
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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 (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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ifp->if_opackets++;
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ifp->if_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) {
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bcopy(dst->sa_data, &af, sizeof(af));
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dst->sa_family = af;
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}
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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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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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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(struct ifnet *ifp, struct mbuf *m, int af, int hlen)
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{
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INIT_VNET_NET(ifp->if_vnet);
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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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#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_queue(isr, m); /* mbuf is free'd on failure. */
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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(int cmd, struct rtentry *rt, struct rt_addrinfo *info)
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{
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RT_LOCK_ASSERT(rt);
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rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu;
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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 ifaddr *ifa;
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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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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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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 (ifp->if_capenable & IFCAP_TXCSUM)
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ifp->if_hwassist = LO_CSUM_FEATURES;
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else
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ifp->if_hwassist = 0;
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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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