297 lines
6.6 KiB
C
297 lines
6.6 KiB
C
/* $NetBSD: if_faith.c,v 1.47 2010/04/05 07:22:23 joerg Exp $ */
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/* $KAME: if_faith.c,v 1.21 2001/02/20 07:59:26 itojun Exp $ */
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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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/*
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* derived from
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* @(#)if_loop.c 8.1 (Berkeley) 6/10/93
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* Id: if_loop.c,v 1.22 1996/06/19 16:24:10 wollman Exp
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*/
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/*
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* IPv6-to-IPv4 TCP relay capturing interface
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: if_faith.c,v 1.47 2010/04/05 07:22:23 joerg Exp $");
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#include "opt_inet.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/errno.h>
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#include <sys/ioctl.h>
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#include <sys/time.h>
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#include <sys/queue.h>
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#include <sys/cpu.h>
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#include <net/if.h>
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#include <net/if_types.h>
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#include <net/netisr.h>
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#include <net/route.h>
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#include <net/bpf.h>
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#include <net/if_faith.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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#include <netinet6/ip6_var.h>
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#endif
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#include <net/net_osdep.h>
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static int faithioctl(struct ifnet *, u_long, void *);
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static int faithoutput(struct ifnet *, struct mbuf *,
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const struct sockaddr *, struct rtentry *);
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static void faithrtrequest(int, struct rtentry *,
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const struct rt_addrinfo *);
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void faithattach(int);
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static int faith_clone_create(struct if_clone *, int);
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static int faith_clone_destroy(struct ifnet *);
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static struct if_clone faith_cloner =
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IF_CLONE_INITIALIZER("faith", faith_clone_create, faith_clone_destroy);
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#define FAITHMTU 1500
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/* ARGSUSED */
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void
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faithattach(int count)
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{
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if_clone_attach(&faith_cloner);
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}
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static int
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faith_clone_create(struct if_clone *ifc, int unit)
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{
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struct ifnet *ifp;
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ifp = if_alloc(IFT_FAITH);
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if_initname(ifp, ifc->ifc_name, unit);
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ifp->if_mtu = FAITHMTU;
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/* Change to BROADCAST experimentaly to announce its prefix. */
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ifp->if_flags = /* IFF_LOOPBACK */ IFF_BROADCAST | IFF_MULTICAST;
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ifp->if_ioctl = faithioctl;
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ifp->if_output = faithoutput;
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ifp->if_type = IFT_FAITH;
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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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if_attach(ifp);
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if_alloc_sadl(ifp);
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bpf_attach(ifp, DLT_NULL, sizeof(u_int));
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return (0);
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}
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int
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faith_clone_destroy(struct ifnet *ifp)
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{
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bpf_detach(ifp);
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if_detach(ifp);
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free(ifp, M_DEVBUF);
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return (0);
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}
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static int
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faithoutput(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
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struct rtentry *rt)
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{
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int s, isr;
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uint32_t af;
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struct ifqueue *ifq = 0;
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if ((m->m_flags & M_PKTHDR) == 0)
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panic("faithoutput no HDR");
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af = dst->sa_family;
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/* BPF write needs to be handled specially */
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if (af == AF_UNSPEC) {
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af = *(mtod(m, int *));
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m_adj(m, sizeof(int));
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}
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bpf_mtap_af(ifp, af, m);
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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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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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ifq = &ip6intrq;
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isr = NETISR_IPV6;
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break;
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#endif
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default:
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m_freem(m);
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return EAFNOSUPPORT;
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}
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/* XXX do we need more sanity checks? */
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m->m_pkthdr.rcvif = ifp;
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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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/* ARGSUSED */
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static void
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faithrtrequest(int cmd, struct rtentry *rt,
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const struct rt_addrinfo *info)
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{
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if (rt)
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rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu; /* for ISO */
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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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static int
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faithioctl(struct ifnet *ifp, u_long cmd, void *data)
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{
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struct ifaddr *ifa;
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struct ifreq *ifr = (struct ifreq *)data;
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int error = 0;
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switch (cmd) {
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case SIOCINITIFADDR:
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ifp->if_flags |= IFF_UP | IFF_RUNNING;
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ifa = (struct ifaddr *)data;
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ifa->ifa_rtrequest = faithrtrequest;
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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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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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if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET)
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error = 0;
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break;
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}
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return (error);
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}
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#ifdef INET6
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/*
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* XXX could be slow
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* XXX could be layer violation to call sys/net from sys/netinet6
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*/
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int
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faithprefix(struct in6_addr *in6)
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{
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struct rtentry *rt;
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struct sockaddr_in6 sin6;
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int ret;
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if (ip6_keepfaith == 0)
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return 0;
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memset(&sin6, 0, sizeof(sin6));
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sin6.sin6_family = AF_INET6;
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sin6.sin6_len = sizeof(struct sockaddr_in6);
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sin6.sin6_addr = *in6;
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rt = rtalloc1((struct sockaddr *)&sin6, 0);
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if (rt && rt->rt_ifp && rt->rt_ifp->if_type == IFT_FAITH &&
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(rt->rt_ifp->if_flags & IFF_UP) != 0)
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ret = 1;
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else
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ret = 0;
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if (rt)
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RTFREE(rt);
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return ret;
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}
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#endif
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