fa24e6f3f8
mbuf chains which are recycled (e.g., ICMP reflection, loopback interface). A consensus was reached that such recycled packets should behave (more-or-less) the same way if a new chain had been allocated and the contents copied to that chain. Some packet tags may in future be marked as "persistent" (e.g., for mandatory access controls) and should persist across such deletion. NetBSD as yet hos no persistent tags, so m_tag_delete_nonpersistent() just deletes all tags. This should not be relied upon.
480 lines
10 KiB
C
480 lines
10 KiB
C
/* $NetBSD: if_loop.c,v 1.49 2003/11/13 01:48:13 jonathan 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 1.49 2003/11/13 01:48:13 jonathan 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_ns.h"
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#include "opt_ipx.h"
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#include "opt_mbuftrace.h"
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#include "bpfilter.h"
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#include "loop.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 <machine/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 NS
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#include <netns/ns.h>
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#include <netns/ns_if.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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#if NBPFILTER > 0
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#include <net/bpf.h>
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#endif
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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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struct ifnet loif[NLOOP];
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#ifdef MBUFTRACE
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struct mowner lomowner[NLOOP];
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#endif
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#ifdef ALTQ
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void lostart(struct ifnet *);
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#endif
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void
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loopattach(n)
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int n;
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{
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int i;
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struct ifnet *ifp;
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for (i = 0; i < NLOOP; i++) {
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ifp = &loif[i];
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sprintf(ifp->if_xname, "lo%d", i);
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ifp->if_softc = NULL;
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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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#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_attach(ifp);
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if_alloc_sadl(ifp);
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#if NBPFILTER > 0
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bpfattach(ifp, DLT_NULL, sizeof(u_int));
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#endif
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#ifdef MBUFTRACE
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ifp->if_mowner = &lomowner[i];
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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(&lomowner[i]);
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#endif
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}
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}
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int
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looutput(ifp, m, dst, rt)
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struct ifnet *ifp;
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struct mbuf *m;
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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 = 0;
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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 NBPFILTER > 0
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if (ifp->if_bpf && (ifp->if_flags & IFF_LOOPBACK)) {
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/*
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* We need to prepend the address family as
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* a four byte field. Cons up a dummy header
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* to pacify bpf. This is safe because bpf
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* will only read from the mbuf (i.e., it won't
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* try to free it or keep a pointer to it).
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*/
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struct mbuf m0;
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u_int32_t af = dst->sa_family;
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m0.m_flags = 0;
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m0.m_next = m;
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m0.m_len = 4;
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m0.m_data = (char *)⁡
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bpf_mtap(ifp->if_bpf, &m0);
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}
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#endif
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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 NS
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case AF_NS:
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ifq = &nsintrq;
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isr = NETISR_NS;
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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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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 NS
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case AF_NS:
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ifq = &nsintrq;
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isr = NETISR_NS;
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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(cmd, rt, info)
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int cmd;
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struct rtentry *rt;
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struct rt_addrinfo *info;
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{
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struct ifnet *ifp = &loif[0];
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if (rt)
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rt->rt_rmx.rmx_mtu = 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(ifp, cmd, data)
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struct ifnet *ifp;
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u_long cmd;
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caddr_t data;
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{
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struct ifaddr *ifa;
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struct ifreq *ifr;
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int error = 0;
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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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ifa = (struct ifaddr *)data;
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if (ifa != 0 /*&& 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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ifr = (struct ifreq *)data;
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if ((unsigned)ifr->ifr_mtu > LOMTU_MAX)
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error = EINVAL;
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else {
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/* XXX update rt mtu for AF_ISO? */
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ifp->if_mtu = ifr->ifr_mtu;
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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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ifr = (struct ifreq *)data;
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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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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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