450 lines
10 KiB
C
450 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_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 <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_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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VNET_DEFINE(struct ifnet *, loif); /* Used externally */
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#ifdef VIMAGE
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STATIC_VNET_DEFINE(struct ifc_simple_data, lo_cloner_data);
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STATIC_VNET_DEFINE(struct if_clone, lo_cloner);
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#define V_lo_cloner_data VNET(lo_cloner_data)
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#define V_lo_cloner VNET(lo_cloner)
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#endif
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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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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 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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V_lo_cloner = lo_cloner;
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V_lo_cloner_data = 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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}
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VNET_SYSINIT(vnet_loif_init, SI_SUB_PROTO_IFATTACHDOMAIN, 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_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
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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, 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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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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