271 lines
6.8 KiB
C
271 lines
6.8 KiB
C
/* $NetBSD: ip_gre.c,v 1.46 2007/05/06 02:48:38 dyoung 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 Heiko W.Rupp <hwr@pilhuhn.de>
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*
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* IPv6-over-GRE contributed by Gert Doering <gert@greenie.muc.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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* deencapsulate tunneled packets and send them on
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* output half is in net/if_gre.[ch]
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* This currently handles IPPROTO_GRE, IPPROTO_MOBILE
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: ip_gre.c,v 1.46 2007/05/06 02:48:38 dyoung Exp $");
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#include "gre.h"
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#if NGRE > 0
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#include "opt_inet.h"
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#include "opt_atalk.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/time.h>
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#include <sys/kernel.h>
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#include <sys/ioctl.h>
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#include <sys/syslog.h>
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#include <net/bpf.h>
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#include <net/ethertypes.h>
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#include <net/if.h>
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#include <net/netisr.h>
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#include <net/route.h>
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#include <net/raw_cb.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_gre.h>
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#else
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#error ip_gre input without IP?
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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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#include <netatalk/at_extern.h>
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#endif
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/* Needs IP headers. */
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#include <net/if_gre.h>
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#include <machine/stdarg.h>
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#if 1
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void gre_inet_ntoa(struct in_addr in); /* XXX */
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#endif
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struct gre_softc *gre_lookup(struct mbuf *, u_int8_t);
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int gre_input2(struct mbuf *, int, u_char);
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/*
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* De-encapsulate a packet and feed it back through ip input (this
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* routine is called whenever IP gets a packet with proto type
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* IPPROTO_GRE and a local destination address).
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* This really is simple
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*/
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void
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gre_input(struct mbuf *m, ...)
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{
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int off, ret, proto;
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va_list ap;
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va_start(ap, m);
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off = va_arg(ap, int);
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proto = va_arg(ap, int);
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va_end(ap);
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ret = gre_input2(m, off, proto);
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/*
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* ret == 0 : packet not processed, meaning that
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* no matching tunnel that is up is found.
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* we inject it to raw ip socket to see if anyone picks it up.
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*/
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if (ret == 0)
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rip_input(m, off, proto);
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}
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/*
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* decapsulate.
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* Does the real work and is called from gre_input() (above)
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* returns 0 if packet is not yet processed
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* and 1 if it needs no further processing
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* proto is the protocol number of the "calling" foo_input()
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* routine.
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*/
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int
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gre_input2(struct mbuf *m, int hlen, u_char proto)
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{
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int rc;
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const struct greip *gip;
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struct gre_softc *sc;
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if ((sc = gre_lookup(m, proto)) == NULL) {
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/* No matching tunnel or tunnel is down. */
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return 0;
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}
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if (m->m_len < sizeof(*gip)) {
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m = m_pullup(m, sizeof(*gip));
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if (m == NULL)
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return ENOBUFS;
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}
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gip = mtod(m, const struct greip *);
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rc = gre_input3(sc, m, hlen, &gip->gi_g, 0);
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return rc;
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}
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/*
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* input routine for IPPRPOTO_MOBILE
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* This is a little bit different from the other modes, as the
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* encapsulating header was not prepended, but instead inserted
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* between IP header and payload
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*/
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void
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gre_mobile_input(struct mbuf *m, ...)
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{
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struct ip *ip;
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struct mobip_h *mip;
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struct ifqueue *ifq;
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struct gre_softc *sc;
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uint8_t *hdr;
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int hlen, s;
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va_list ap;
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int msiz;
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va_start(ap, m);
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hlen = va_arg(ap, int);
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va_end(ap);
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if ((sc = gre_lookup(m, IPPROTO_MOBILE)) == NULL) {
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/* No matching tunnel or tunnel is down. */
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m_freem(m);
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return;
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}
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if (M_UNWRITABLE(m, sizeof(*mip))) {
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m = m_pullup(m, sizeof(*mip));
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if (m == NULL)
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return;
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}
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ip = mtod(m, struct ip *);
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/* XXX what if there are IP options? */
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mip = mtod(m, struct mobip_h *);
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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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if (ntohs(mip->mh.proto) & MOB_H_SBIT) {
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msiz = MOB_H_SIZ_L;
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mip->mi.ip_src.s_addr = mip->mh.osrc;
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} else
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msiz = MOB_H_SIZ_S;
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if (M_UNWRITABLE(m, hlen + msiz)) {
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m = m_pullup(m, hlen + msiz);
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if (m == NULL)
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return;
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ip = mtod(m, struct ip *);
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mip = mtod(m, struct mobip_h *);
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}
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mip->mi.ip_dst.s_addr = mip->mh.odst;
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mip->mi.ip_p = (ntohs(mip->mh.proto) >> 8);
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if (gre_in_cksum((u_int16_t *)&mip->mh, msiz) != 0) {
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m_freem(m);
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return;
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}
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hdr = mtod(m, uint8_t *);
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memmove(hdr + hlen, hdr + hlen + msiz, m->m_len - msiz - hlen);
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m->m_len -= msiz;
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ip->ip_len = htons(ntohs(ip->ip_len) - msiz);
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m->m_pkthdr.len -= msiz;
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ip->ip_sum = 0;
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ip->ip_sum = in_cksum(m, hlen);
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#if NBPFILTER > 0
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if (sc->sc_if.if_bpf != NULL)
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bpf_mtap_af(sc->sc_if.if_bpf, AF_INET, m);
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#endif /*NBPFILTER > 0*/
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ifq = &ipintrq;
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s = splnet(); /* possible */
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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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} else
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IF_ENQUEUE(ifq, m);
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splx(s);
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}
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/*
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* Find the gre interface associated with our src/dst/proto set.
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*/
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struct gre_softc *
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gre_lookup(struct mbuf *m, u_int8_t proto)
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{
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const struct ip *ip = mtod(m, const struct ip *);
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struct gre_softc *sc;
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LIST_FOREACH(sc, &gre_softc_list, sc_list) {
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if (sc->g_dst.s_addr == ip->ip_src.s_addr &&
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sc->g_src.s_addr == ip->ip_dst.s_addr &&
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sc->sc_proto == proto &&
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(sc->sc_if.if_flags & IFF_UP) != 0)
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return sc;
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}
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return NULL;
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}
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#endif /* if NGRE > 0 */
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