505 lines
11 KiB
C
505 lines
11 KiB
C
/* $NetBSD: if_loop.c,v 1.36 2001/01/17 04:05:42 itojun 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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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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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*/
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/*
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* Loopback interface driver for protocol testing and timing.
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*/
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#include "opt_inet.h"
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#include "opt_atalk.h"
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#include "opt_iso.h"
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#include "opt_ns.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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#else
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#define LOMTU (32768 + MHLEN + MLEN)
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#endif
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struct ifnet loif[NLOOP];
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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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}
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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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if ((m->m_flags & M_PKTHDR) == 0)
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panic("looutput: no header mbuf");
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ifp->if_lastchange = time;
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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_int af = dst->sa_family;
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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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#ifndef PULLDOWN_TEST
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/*
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* KAME requires that the packet to be contiguous on the
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* mbuf. We need to make that sure.
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* this kind of code should be avoided.
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* XXX other conditions to avoid running this part?
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*/
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if (m->m_len != m->m_pkthdr.len) {
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struct mbuf *n = NULL;
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int maxlen;
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MGETHDR(n, M_DONTWAIT, MT_HEADER);
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maxlen = MHLEN;
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if (n)
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M_COPY_PKTHDR(n, m);
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if (n && m->m_pkthdr.len > maxlen) {
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MCLGET(n, M_DONTWAIT);
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maxlen = MCLBYTES;
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if ((n->m_flags & M_EXT) == 0) {
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m_free(n);
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n = NULL;
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}
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}
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if (!n) {
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printf("looutput: mbuf allocation failed\n");
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m_freem(m);
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return ENOBUFS;
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}
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if (m->m_pkthdr.len <= maxlen) {
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m_copydata(m, 0, m->m_pkthdr.len, mtod(n, caddr_t));
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n->m_len = m->m_pkthdr.len;
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n->m_next = NULL;
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m_freem(m);
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} else {
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m_copydata(m, 0, maxlen, mtod(n, caddr_t));
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m_adj(m, maxlen);
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n->m_len = maxlen;
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n->m_next = m;
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m->m_flags &= ~M_PKTHDR;
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}
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m = n;
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}
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#if 0
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if (m && m->m_next != NULL) {
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printf("loop: not contiguous...\n");
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m_freem(m);
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return ENOBUFS;
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}
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#endif
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#endif
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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 = splimp();
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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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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 = splimp();
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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 = splimp();
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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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if (rt)
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rt->rt_rmx.rmx_mtu = LOMTU;
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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 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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