413 lines
9.5 KiB
C
413 lines
9.5 KiB
C
/* $NetBSD: ip_ipip.c,v 1.15 2001/04/13 23:30:23 thorpej Exp $ */
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/*-
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* Copyright (c) 1998 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
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* NASA Ames Research Center; Heiko W.Rupp <hwr@pilhuhn.de>.
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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 NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Encapsulate for and decapsulate packets received on an IP-in-IP tunnel.
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*
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* See: RFC 2003.
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*/
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#include "opt_inet.h"
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#include "bpfilter.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/protosw.h>
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#include <sys/errno.h>
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#include <sys/kernel.h>
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#include <sys/proc.h>
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#include <sys/ioctl.h>
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#include <net/if.h>
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#include <net/if_types.h>
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#ifdef INET
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#include <netinet/in.h>
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#include <netinet/in_var.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/ip_var.h>
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#include <netinet/ip_ipip.h>
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#include <netinet/ip_encap.h>
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#else
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#error IPIP without INET?
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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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#include <machine/stdarg.h>
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struct ipip_softc *ipip_softc;
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int ipip_nsoftc;
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static int ipip_encapcheck __P((const struct mbuf *, int, int, void *));
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void ipipattach __P((int));
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int ipip_output __P((struct ifnet *, struct mbuf *, struct sockaddr *,
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struct rtentry *));
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int ipip_ioctl __P((struct ifnet *, u_long, caddr_t));
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void ipip_compute_route __P((struct ipip_softc *));
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extern struct protosw ipip_protosw;
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/*
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* Note this is a common IP-in-IP input for both ipip `interfaces'
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* and the multicast routing code's IP-in-IP needs.
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*/
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void
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#if __STDC__
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ipip_input(struct mbuf *m, ...)
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#else
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ipip_input(m, va_alist)
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sruct mbuf *m;
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va_dcl
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#endif
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{
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struct ipip_softc *sc;
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int hlen, proto;
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va_list ap;
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va_start(ap, m);
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hlen = va_arg(ap, int);
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proto = va_arg(ap, int);
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va_end(ap);
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sc = (struct ipip_softc *)encap_getarg(m);
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if (sc != NULL) {
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int s;
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sc->sc_if.if_ipackets++;
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sc->sc_if.if_ibytes += m->m_pkthdr.len;
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m_adj(m, hlen);
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m->m_pkthdr.rcvif = &sc->sc_if;
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s = splnet();
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if (IF_QFULL(&ipintrq)) {
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IF_DROP(&ipintrq);
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m_freem(m);
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} else {
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IF_ENQUEUE(&ipintrq, m);
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/*
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* No need to reschedule an IP netisr, since
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* ipintr() will simply continue looping and
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* see the packet we just enqueued.
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*/
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}
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splx(s);
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/* No more processing at this level. */
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return;
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}
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m_freem(m);
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}
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/*
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* Find the ipip interface associated with our src/dst.
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*/
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static int
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ipip_encapcheck(m, off, proto, arg)
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const struct mbuf *m;
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int off;
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int proto;
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void *arg;
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{
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struct ipip_softc *sc;
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struct ip ip;
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sc = (struct ipip_softc *)arg;
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if (sc == NULL)
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return 0;
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if ((sc->sc_if.if_flags & IFF_UP) == 0)
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return 0;
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/* LINTED const cast */
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m_copydata((struct mbuf *)m, 0, sizeof(ip), (caddr_t)&ip);
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if (!in_hosteq(sc->sc_dst, ip.ip_src) ||
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!in_hosteq(sc->sc_src, ip.ip_dst))
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return 0;
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/* both address matched */
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return 32 * 2;
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}
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/*
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* Attach the IPIP pseudo-devices.
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*/
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/* ARGSUSED */
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void
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ipipattach(count)
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int count;
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{
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struct ipip_softc *sc;
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size_t size;
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int i;
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ipip_nsoftc = count;
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size = sizeof(struct ipip_softc) * count;
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ipip_softc = malloc(size, M_DEVBUF, M_WAITOK);
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memset(ipip_softc, 0, size);
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for (i = 0; i < ipip_nsoftc; i++) {
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sc = &ipip_softc[i];
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sprintf(sc->sc_if.if_xname, "ipip%d", i);
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sc->sc_cookie = encap_attach_func(AF_INET, IPPROTO_IPIP,
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ipip_encapcheck, &ipip_protosw, sc);
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if (sc->sc_cookie == NULL) {
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printf("%s: attach failed\n", sc->sc_if.if_xname);
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continue;
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}
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sc->sc_if.if_softc = sc;
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sc->sc_if.if_type = IFT_OTHER;
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sc->sc_if.if_dlt = DLT_NULL;
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sc->sc_if.if_addrlen = sizeof(struct in_addr);
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sc->sc_if.if_hdrlen = sizeof(struct ip);
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sc->sc_if.if_mtu = 0; /* filled in later */
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sc->sc_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
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sc->sc_if.if_output = ipip_output;
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sc->sc_if.if_ioctl = ipip_ioctl;
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sc->sc_src.s_addr = INADDR_ANY;
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sc->sc_dst.s_addr = INADDR_ANY;
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if_attach(&sc->sc_if);
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if_alloc_sadl(&sc->sc_if);
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#if NBPFILTER > 0
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bpfattach(&sc->sc_if, DLT_NULL, sc->sc_if.if_hdrlen);
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#endif
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}
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}
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int
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ipip_output(ifp, m0, dst, rt)
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struct ifnet *ifp;
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struct mbuf *m0;
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struct sockaddr *dst;
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struct rtentry *rt;
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{
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struct ipip_softc *sc = ifp->if_softc;
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struct ip *nip, *ip;
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int error;
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if (dst->sa_family != AF_INET) {
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IF_DROP(&ifp->if_snd);
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m_freem(m0);
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return (EAFNOSUPPORT);
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}
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ip = mtod(m0, struct ip *);
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/* Add the new IP header. */
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M_PREPEND(m0, sizeof(struct ip), M_DONTWAIT);
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if (m0 == NULL)
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return (ENOBUFS);
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nip = mtod(m0, struct ip *);
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memset(nip, 0, sizeof(*nip));
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nip->ip_hl = sizeof(*nip) >> 2;
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nip->ip_tos = ip->ip_tos;
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nip->ip_len = m0->m_pkthdr.len;
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nip->ip_ttl = ip->ip_ttl;
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nip->ip_p = IPPROTO_IPIP;
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nip->ip_src = sc->sc_src;
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nip->ip_dst = sc->sc_dst;
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#if NBPFILTER > 0
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if (ifp->if_bpf)
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bpf_mtap(ifp->if_bpf, m0);
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#endif
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ifp->if_opackets++;
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ifp->if_obytes += m0->m_pkthdr.len;
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error = ip_output(m0, NULL, &sc->sc_route, 0, NULL);
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if (error)
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ifp->if_oerrors++;
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return (error);
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}
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int
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ipip_ioctl(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 ipip_softc *sc = ifp->if_softc;
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struct ifaddr *ifa = (struct ifaddr *)data;
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struct in_ifaddr *ia = (struct in_ifaddr *)data;
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struct ifreq *ifr = (struct ifreq *)data;
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int s, error = 0;
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s = splnet();
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switch (cmd) {
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case SIOCSIFADDR:
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case SIOCSIFDSTADDR:
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if (ifa->ifa_addr->sa_family != AF_INET) {
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error = EAFNOSUPPORT;
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break;
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}
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sc->sc_src = (satosin(ifa->ifa_addr))->sin_addr;
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sc->sc_dst = ia->ia_dstaddr.sin_addr;
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ifp->if_mtu = 0;
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ifp->if_flags &= ~IFF_UP;
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if (!in_nullhost(sc->sc_src) && !in_nullhost(sc->sc_dst)) {
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struct rtentry *rt;
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ipip_compute_route(sc);
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/*
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* Now that we know the route to use, fill in the
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* MTU.
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*/
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rt = sc->sc_route.ro_rt;
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if (rt != NULL) {
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ifp->if_mtu = rt->rt_ifp->if_mtu -
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ifp->if_hdrlen;
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ifp->if_flags |= IFF_UP;
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}
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}
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break;
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case SIOCSIFFLAGS:
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if (in_nullhost(sc->sc_src) || in_nullhost(sc->sc_dst))
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ifp->if_flags &= ~IFF_UP;
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if (ifp->if_flags & IFF_UP) {
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if (sc->sc_route.ro_rt == NULL) {
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struct rtentry *rt;
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ipip_compute_route(sc);
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rt = sc->sc_route.ro_rt;
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if (rt != NULL)
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ifp->if_mtu = rt->rt_ifp->if_mtu -
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ifp->if_hdrlen;
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else
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ifp->if_flags &= ~IFF_UP;
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}
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}
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else {
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if (sc->sc_route.ro_rt != NULL) {
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RTFREE(sc->sc_route.ro_rt);
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sc->sc_route.ro_rt = NULL;
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}
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ifp->if_mtu = 0;
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}
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break;
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case SIOCSIFMTU:
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if (ifr->ifr_mtu < (IP_MSS - ifp->if_hdrlen)) {
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error = EINVAL;
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break;
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}
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if (sc->sc_route.ro_rt != NULL &&
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ifr->ifr_mtu > (sc->sc_route.ro_rt->rt_ifp->if_mtu -
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ifp->if_hdrlen)) {
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error = EINVAL;
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break;
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}
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ifp->if_mtu = ifr->ifr_mtu;
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break;
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case SIOCADDMULTI:
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case SIOCDELMULTI:
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if (ifr == NULL || ifr->ifr_addr.sa_family != AF_INET) {
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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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splx(s);
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return (error);
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}
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/*
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* Compute a less-specific route to the destination such that ip_output()
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* will not loop the packet back to ipip_output().
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*/
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void
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ipip_compute_route(sc)
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struct ipip_softc *sc;
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{
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struct route *ro;
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ro = &sc->sc_route;
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if (ro->ro_rt != NULL)
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RTFREE(ro->ro_rt);
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ro->ro_rt = NULL;
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memset(&ro->ro_dst, 0, sizeof(ro->ro_dst));
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ro->ro_dst.sa_family = AF_INET;
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ro->ro_dst.sa_len = sizeof(ro->ro_dst);
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/*
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* Toggle the last bit on the address so our interface won't
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* match.
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*
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* XXX What we want here is a flag to exclude picking routes
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* XXX with this interface.
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*/
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((struct sockaddr_in *)&ro->ro_dst)->sin_addr.s_addr =
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htonl(ntohl(sc->sc_dst.s_addr) ^ 1);
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rtalloc(ro);
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/*
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* Now change it back, or else ip_ouput() will just drop
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* the route and find the one for the ipip interface.
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*/
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((struct sockaddr_in *)&ro->ro_dst)->sin_addr = sc->sc_dst;
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}
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