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384 lines
8.5 KiB
C
384 lines
8.5 KiB
C
/* $KAME: if_faith.c,v 1.23 2001/12/17 13:55:29 sumikawa 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. 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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* $FreeBSD$
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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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* 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_inet6.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/sockio.h>
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#include <sys/time.h>
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#include <sys/queue.h>
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#include <sys/types.h>
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#include <sys/malloc.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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#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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#define FAITHNAME "faith"
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struct faith_softc {
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struct ifnet sc_if; /* must be first */
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LIST_ENTRY(faith_softc) sc_list;
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};
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static int faithioctl(struct ifnet *, u_long, caddr_t);
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int faithoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
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struct rtentry *);
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static void faithrtrequest(int, struct rtentry *, struct rt_addrinfo *);
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#ifdef INET6
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static int faithprefix(struct in6_addr *);
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#endif
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static int faithmodevent(module_t, int, void *);
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static MALLOC_DEFINE(M_FAITH, FAITHNAME, "Firewall Assisted Tunnel Interface");
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static LIST_HEAD(, faith_softc) faith_softc_list;
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int faith_clone_create(struct if_clone *, int);
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int faith_clone_destroy(struct ifnet *);
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struct if_clone faith_cloner = IF_CLONE_INITIALIZER(FAITHNAME,
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faith_clone_create, faith_clone_destroy, IF_MAXUNIT);
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#define FAITHMTU 1500
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static int
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faithmodevent(mod, type, data)
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module_t mod;
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int type;
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void *data;
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{
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switch (type) {
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case MOD_LOAD:
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LIST_INIT(&faith_softc_list);
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if_clone_attach(&faith_cloner);
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#ifdef INET6
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faithprefix_p = faithprefix;
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#endif
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break;
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case MOD_UNLOAD:
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#ifdef INET6
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faithprefix_p = NULL;
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#endif
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if_clone_detach(&faith_cloner);
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while (!LIST_EMPTY(&faith_softc_list))
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faith_clone_destroy(
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&LIST_FIRST(&faith_softc_list)->sc_if);
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break;
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}
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return 0;
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}
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static moduledata_t faith_mod = {
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"if_faith",
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faithmodevent,
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0
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};
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DECLARE_MODULE(if_faith, faith_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
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MODULE_VERSION(if_faith, 1);
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int
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faith_clone_create(ifc, unit)
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struct if_clone *ifc;
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int unit;
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{
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struct faith_softc *sc;
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sc = malloc(sizeof(struct faith_softc), M_FAITH, M_WAITOK);
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bzero(sc, sizeof(struct faith_softc));
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sc->sc_if.if_softc = sc;
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sc->sc_if.if_name = FAITHNAME;
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sc->sc_if.if_unit = unit;
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sc->sc_if.if_mtu = FAITHMTU;
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/* Change to BROADCAST experimentaly to announce its prefix. */
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sc->sc_if.if_flags = /* IFF_LOOPBACK */ IFF_BROADCAST | IFF_MULTICAST;
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sc->sc_if.if_ioctl = faithioctl;
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sc->sc_if.if_output = faithoutput;
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sc->sc_if.if_type = IFT_FAITH;
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sc->sc_if.if_hdrlen = 0;
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sc->sc_if.if_addrlen = 0;
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sc->sc_if.if_snd.ifq_maxlen = ifqmaxlen;
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if_attach(&sc->sc_if);
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bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int));
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LIST_INSERT_HEAD(&faith_softc_list, sc, sc_list);
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return (0);
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}
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int
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faith_clone_destroy(ifp)
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struct ifnet *ifp;
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{
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struct faith_softc *sc = (void *) ifp;
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LIST_REMOVE(sc, sc_list);
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bpfdetach(ifp);
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if_detach(ifp);
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free(sc, M_FAITH);
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return (0);
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}
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int
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faithoutput(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 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("faithoutput no HDR");
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/* BPF write needs to be handled specially */
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if (dst->sa_family == AF_UNSPEC) {
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dst->sa_family = *(mtod(m, int *));
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m->m_len -= sizeof(int);
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m->m_pkthdr.len -= sizeof(int);
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m->m_data += sizeof(int);
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}
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if (ifp->if_bpf) {
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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 faith 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 a to it).
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*/
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struct mbuf m0;
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u_int32_t af = dst->sa_family;
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m0.m_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, &m0);
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}
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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 (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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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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ifp->if_ipackets++;
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ifp->if_ibytes += m->m_pkthdr.len;
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(void) IF_HANDOFF(ifq, m, NULL);
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schednetisr(isr);
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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(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 = rt->rt_ifp->if_mtu; /* for ISO */
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/*
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* For optimal performance, the send and receive buffers
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* should be at least twice the MTU plus a little more for
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* overhead.
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*/
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rt->rt_rmx.rmx_recvpipe =
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rt->rt_rmx.rmx_sendpipe = 3 * FAITHMTU;
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}
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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(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 = (struct ifreq *)data;
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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 | 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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#ifdef SIOCSIFMTU
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case SIOCSIFMTU:
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ifp->if_mtu = ifr->ifr_mtu;
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break;
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#endif
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case SIOCSIFFLAGS:
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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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#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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static int
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faithprefix(in6)
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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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bzero(&sin6, 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, 0UL);
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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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