10fe49d72c
#if NBPFILTER is no longer required in the client. This change doesn't yet add support for loading bpf as a module, since drivers can register before bpf is attached. However, callers of bpf can now be modularized. Dynamically loadable bpf could probably be done fairly easily with coordination from the stub driver and the real driver by registering attachments in the stub before the real driver is loaded and doing a handoff. ... and I'm not going to ponder the depths of unload here. Tested with i386/MONOLITHIC, modified MONOLITHIC without bpf and rump.
458 lines
10 KiB
C
458 lines
10 KiB
C
/* $NetBSD: if_loop.c,v 1.71 2010/01/19 22:08:01 pooka Exp $ */
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/*
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project 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 PROJECT 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 PROJECT 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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/*
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* Copyright (c) 1982, 1986, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. 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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*/
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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 <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: if_loop.c,v 1.71 2010/01/19 22:08:01 pooka Exp $");
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#include "opt_inet.h"
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#include "opt_atalk.h"
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#include "opt_iso.h"
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#include "opt_ipx.h"
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#include "opt_mbuftrace.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/socket.h>
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#include <sys/errno.h>
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#include <sys/ioctl.h>
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#include <sys/time.h>
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#include <sys/cpu.h>
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#include <net/if.h>
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#include <net/if_types.h>
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#include <net/netisr.h>
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#include <net/route.h>
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#ifdef INET
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/in_var.h>
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#include <netinet/ip.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 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 ISO
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#include <netiso/iso.h>
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#include <netiso/iso_var.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 <net/bpf.h>
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#if defined(LARGE_LOMTU)
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#define LOMTU (131072 + MHLEN + MLEN)
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#define LOMTU_MAX LOMTU
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#else
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#define LOMTU (32768 + MHLEN + MLEN)
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#define LOMTU_MAX (65536 + MHLEN + MLEN)
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#endif
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#ifdef ALTQ
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static void lostart(struct ifnet *);
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#endif
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static int loop_clone_create(struct if_clone *, int);
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static int loop_clone_destroy(struct ifnet *);
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static struct if_clone loop_cloner =
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IF_CLONE_INITIALIZER("lo", loop_clone_create, loop_clone_destroy);
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void
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loopattach(int n)
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{
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(void)loop_clone_create(&loop_cloner, 0); /* lo0 always exists */
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if_clone_attach(&loop_cloner);
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}
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static int
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loop_clone_create(struct if_clone *ifc, int unit)
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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_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 | IFF_RUNNING;
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ifp->if_ioctl = loioctl;
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ifp->if_output = looutput;
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#ifdef ALTQ
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ifp->if_start = lostart;
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#endif
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ifp->if_type = IFT_LOOP;
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ifp->if_hdrlen = 0;
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ifp->if_addrlen = 0;
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ifp->if_dlt = DLT_NULL;
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IFQ_SET_READY(&ifp->if_snd);
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if (unit == 0)
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lo0ifp = ifp;
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if_attach(ifp);
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if_alloc_sadl(ifp);
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bpf_ops->bpf_attach(ifp, DLT_NULL, sizeof(u_int), &ifp->if_bpf);
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#ifdef MBUFTRACE
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ifp->if_mowner = malloc(sizeof(struct mowner), M_DEVBUF,
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M_WAITOK | M_ZERO);
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strlcpy(ifp->if_mowner->mo_name, ifp->if_xname,
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sizeof(ifp->if_mowner->mo_name));
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MOWNER_ATTACH(ifp->if_mowner);
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#endif
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return (0);
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}
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static int
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loop_clone_destroy(struct ifnet *ifp)
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{
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if (ifp == lo0ifp)
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return (EPERM);
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#ifdef MBUFTRACE
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MOWNER_DETACH(ifp->if_mowner);
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free(ifp->if_mowner, M_DEVBUF);
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#endif
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bpf_ops->bpf_detach(ifp);
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if_detach(ifp);
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free(ifp, M_DEVBUF);
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return (0);
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}
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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 rtentry *rt)
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{
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int s, isr;
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struct ifqueue *ifq = NULL;
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MCLAIM(m, ifp->if_mowner);
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if ((m->m_flags & M_PKTHDR) == 0)
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panic("looutput: no header mbuf");
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if (ifp->if_bpf && (ifp->if_flags & IFF_LOOPBACK))
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bpf_ops->bpf_mtap_af(ifp->if_bpf, dst->sa_family, m);
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m->m_pkthdr.rcvif = ifp;
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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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#ifdef ALTQ
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/*
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* ALTQ on the loopback interface is just for debugging. It's
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* used only for loopback interfaces, not for a simplex interface.
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*/
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if ((ALTQ_IS_ENABLED(&ifp->if_snd) || TBR_IS_ENABLED(&ifp->if_snd)) &&
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ifp->if_start == lostart) {
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struct altq_pktattr pktattr;
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int error;
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/*
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* If the queueing discipline needs packet classification,
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* do it before prepending the link headers.
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*/
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IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr);
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M_PREPEND(m, sizeof(uint32_t), M_DONTWAIT);
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if (m == NULL)
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return (ENOBUFS);
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*(mtod(m, uint32_t *)) = dst->sa_family;
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s = splnet();
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IFQ_ENQUEUE(&ifp->if_snd, m, &pktattr, error);
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(*ifp->if_start)(ifp);
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splx(s);
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return (error);
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}
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#endif /* ALTQ */
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m_tag_delete_nonpersistent(m);
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switch (dst->sa_family) {
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#ifdef INET
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case AF_INET:
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ifq = &ipintrq;
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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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ifq = &ip6intrq;
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isr = NETISR_IPV6;
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break;
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#endif
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#ifdef ISO
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case AF_ISO:
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ifq = &clnlintrq;
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isr = NETISR_ISO;
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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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ifq = &ipxintrq;
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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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ifq = &atintrq2;
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isr = NETISR_ATALK;
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break;
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#endif
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default:
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printf("%s: can't handle af%d\n", ifp->if_xname,
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dst->sa_family);
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m_freem(m);
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return (EAFNOSUPPORT);
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}
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s = splnet();
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if (IF_QFULL(ifq)) {
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IF_DROP(ifq);
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m_freem(m);
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splx(s);
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return (ENOBUFS);
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}
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IF_ENQUEUE(ifq, m);
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schednetisr(isr);
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ifp->if_ipackets++;
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ifp->if_ibytes += m->m_pkthdr.len;
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splx(s);
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return (0);
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}
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#ifdef ALTQ
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static void
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lostart(struct ifnet *ifp)
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{
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struct ifqueue *ifq;
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struct mbuf *m;
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uint32_t af;
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int s, isr;
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for (;;) {
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IFQ_DEQUEUE(&ifp->if_snd, m);
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if (m == NULL)
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return;
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af = *(mtod(m, uint32_t *));
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m_adj(m, sizeof(uint32_t));
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switch (af) {
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#ifdef INET
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case AF_INET:
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ifq = &ipintrq;
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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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ifq = &ip6intrq;
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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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ifq = &ipxintrq;
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isr = NETISR_IPX;
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break;
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#endif
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#ifdef ISO
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case AF_ISO:
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ifq = &clnlintrq;
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isr = NETISR_ISO;
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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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ifq = &atintrq2;
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isr = NETISR_ATALK;
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break;
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#endif
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default:
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printf("%s: can't handle af%d\n", ifp->if_xname, af);
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m_freem(m);
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return;
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}
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s = splnet();
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if (IF_QFULL(ifq)) {
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IF_DROP(ifq);
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splx(s);
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m_freem(m);
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return;
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}
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IF_ENQUEUE(ifq, m);
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schednetisr(isr);
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ifp->if_ipackets++;
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ifp->if_ibytes += m->m_pkthdr.len;
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splx(s);
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}
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}
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#endif /* ALTQ */
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/* ARGSUSED */
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void
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lortrequest(int cmd, struct rtentry *rt,
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const struct rt_addrinfo *info)
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{
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if (rt)
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rt->rt_rmx.rmx_mtu = lo0ifp->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, void *data)
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{
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struct ifaddr *ifa;
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struct ifreq *ifr = data;
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int error = 0;
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switch (cmd) {
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case SIOCINITIFADDR:
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ifp->if_flags |= IFF_UP;
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ifa = (struct ifaddr *)data;
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if (ifa != NULL /*&& ifa->ifa_addr->sa_family == AF_ISO*/)
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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 SIOCSIFMTU:
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if ((unsigned)ifr->ifr_mtu > LOMTU_MAX)
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error = EINVAL;
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else if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET){
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/* XXX update rt mtu for AF_ISO? */
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error = 0;
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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 (ifreq_getaddr(cmd, ifr)->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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default:
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error = ifioctl_common(ifp, cmd, data);
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}
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return (error);
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}
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