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if_faith.c revision 1.22 
      1 /*	$NetBSD: if_faith.c,v 1.22 2001/11/12 23:49:37 lukem Exp $	*/
      2 /*	$KAME: if_faith.c,v 1.21 2001/02/20 07:59:26 itojun Exp $	*/
      3 
      4 /*
      5  * Copyright (c) 1982, 1986, 1993
      6  *	The Regents of the University of California.  All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  * 3. All advertising materials mentioning features or use of this software
     17  *    must display the following acknowledgement:
     18  *	This product includes software developed by the University of
     19  *	California, Berkeley and its contributors.
     20  * 4. Neither the name of the University nor the names of its contributors
     21  *    may be used to endorse or promote products derived from this software
     22  *    without specific prior written permission.
     23  *
     24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  * SUCH DAMAGE.
     35  */
     36 /*
     37  * derived from
     38  *	@(#)if_loop.c	8.1 (Berkeley) 6/10/93
     39  * Id: if_loop.c,v 1.22 1996/06/19 16:24:10 wollman Exp
     40  */
     41 
     42 /*
     43  * Loopback interface driver for protocol testing and timing.
     44  */
     45 
     46 #include <sys/cdefs.h>
     47 __KERNEL_RCSID(0, "$NetBSD: if_faith.c,v 1.22 2001/11/12 23:49:37 lukem Exp $");
     48 
     49 #include "opt_inet.h"
     50 
     51 #include "faith.h"
     52 #if NFAITH > 0
     53 
     54 #include <sys/param.h>
     55 #include <sys/systm.h>
     56 #include <sys/kernel.h>
     57 #include <sys/mbuf.h>
     58 #include <sys/socket.h>
     59 #include <sys/errno.h>
     60 #include <sys/ioctl.h>
     61 #include <sys/time.h>
     62 #include <sys/queue.h>
     63 
     64 #include <machine/cpu.h>
     65 
     66 #include <net/if.h>
     67 #include <net/if_types.h>
     68 #include <net/netisr.h>
     69 #include <net/route.h>
     70 #include <net/bpf.h>
     71 #include <net/if_faith.h>
     72 
     73 #ifdef	INET
     74 #include <netinet/in.h>
     75 #include <netinet/in_systm.h>
     76 #include <netinet/in_var.h>
     77 #include <netinet/ip.h>
     78 #endif
     79 
     80 #ifdef INET6
     81 #ifndef INET
     82 #include <netinet/in.h>
     83 #endif
     84 #include <netinet6/in6_var.h>
     85 #include <netinet/ip6.h>
     86 #include <netinet6/ip6_var.h>
     87 #endif
     88 
     89 #include "bpfilter.h"
     90 
     91 #include <net/net_osdep.h>
     92 
     93 struct faith_softc {
     94 	struct ifnet sc_if;	/* must be first */
     95 	LIST_ENTRY(faith_softc) sc_list;
     96 };
     97 
     98 static int faithioctl __P((struct ifnet *, u_long, caddr_t));
     99 int faithoutput __P((struct ifnet *, struct mbuf *, struct sockaddr *,
    100 	struct rtentry *));
    101 static void faithrtrequest __P((int, struct rtentry *, struct rt_addrinfo *));
    102 
    103 void faithattach __P((int));
    104 
    105 LIST_HEAD(, faith_softc) faith_softc_list;
    106 
    107 int	faith_clone_create __P((struct if_clone *, int));
    108 void	faith_clone_destroy __P((struct ifnet *));
    109 
    110 struct if_clone faith_cloner =
    111     IF_CLONE_INITIALIZER("faith", faith_clone_create, faith_clone_destroy);
    112 
    113 #define	FAITHMTU	1500
    114 
    115 /* ARGSUSED */
    116 void
    117 faithattach(count)
    118 	int count;
    119 {
    120 
    121 	LIST_INIT(&faith_softc_list);
    122 	if_clone_attach(&faith_cloner);
    123 }
    124 
    125 int
    126 faith_clone_create(ifc, unit)
    127 	struct if_clone *ifc;
    128 	int unit;
    129 {
    130 	struct faith_softc *sc;
    131 
    132 	sc = malloc(sizeof(struct faith_softc), M_DEVBUF, M_WAITOK);
    133 	memset(sc, 0, sizeof(struct faith_softc));
    134 
    135 	sprintf(sc->sc_if.if_xname, "%s%d", ifc->ifc_name, unit);
    136 
    137 	sc->sc_if.if_mtu = FAITHMTU;
    138 	/* Change to BROADCAST experimentaly to announce its prefix. */
    139 	sc->sc_if.if_flags = /* IFF_LOOPBACK */ IFF_BROADCAST | IFF_MULTICAST;
    140 	sc->sc_if.if_ioctl = faithioctl;
    141 	sc->sc_if.if_output = faithoutput;
    142 	sc->sc_if.if_type = IFT_FAITH;
    143 	sc->sc_if.if_hdrlen = 0;
    144 	sc->sc_if.if_addrlen = 0;
    145 	sc->sc_if.if_dlt = DLT_NULL;
    146 	if_attach(&sc->sc_if);
    147 	if_alloc_sadl(&sc->sc_if);
    148 #if NBPFILTER > 0
    149 	bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int));
    150 #endif
    151 	LIST_INSERT_HEAD(&faith_softc_list, sc, sc_list);
    152 	return (0);
    153 }
    154 
    155 void
    156 faith_clone_destroy(ifp)
    157 	struct ifnet *ifp;
    158 {
    159 	struct faith_softc *sc = (void *) ifp;
    160 
    161 	LIST_REMOVE(sc, sc_list);
    162 #if NBPFILTER > 0
    163 	bpfdetach(ifp);
    164 #endif
    165 	if_detach(ifp);
    166 	free(sc, M_DEVBUF);
    167 }
    168 
    169 int
    170 faithoutput(ifp, m, dst, rt)
    171 	struct ifnet *ifp;
    172 	struct mbuf *m;
    173 	struct sockaddr *dst;
    174 	struct rtentry *rt;
    175 {
    176 	int s, isr;
    177 	struct ifqueue *ifq = 0;
    178 
    179 	if ((m->m_flags & M_PKTHDR) == 0)
    180 		panic("faithoutput no HDR");
    181 #if NBPFILTER > 0
    182 	/* BPF write needs to be handled specially */
    183 	if (dst->sa_family == AF_UNSPEC) {
    184 		dst->sa_family = *(mtod(m, int *));
    185 		m->m_len -= sizeof(int);
    186 		m->m_pkthdr.len -= sizeof(int);
    187 		m->m_data += sizeof(int);
    188 	}
    189 
    190 	if (ifp->if_bpf) {
    191 		/*
    192 		 * We need to prepend the address family as
    193 		 * a four byte field.  Cons up a faith header
    194 		 * to pacify bpf.  This is safe because bpf
    195 		 * will only read from the mbuf (i.e., it won't
    196 		 * try to free it or keep a pointer a to it).
    197 		 */
    198 		struct mbuf m0;
    199 		u_int32_t af = dst->sa_family;
    200 
    201 		m0.m_next = m;
    202 		m0.m_len = 4;
    203 		m0.m_data = (char *)&af;
    204 
    205 #ifdef HAVE_OLD_BPF
    206 		bpf_mtap(ifp, &m0);
    207 #else
    208 		bpf_mtap(ifp->if_bpf, &m0);
    209 #endif
    210 	}
    211 #endif
    212 
    213 	if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
    214 		m_freem(m);
    215 		return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
    216 		        rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
    217 	}
    218 	ifp->if_opackets++;
    219 	ifp->if_obytes += m->m_pkthdr.len;
    220 	switch (dst->sa_family) {
    221 #ifdef INET
    222 	case AF_INET:
    223 		ifq = &ipintrq;
    224 		isr = NETISR_IP;
    225 		break;
    226 #endif
    227 #ifdef INET6
    228 	case AF_INET6:
    229 		ifq = &ip6intrq;
    230 		isr = NETISR_IPV6;
    231 		break;
    232 #endif
    233 	default:
    234 		m_freem(m);
    235 		return EAFNOSUPPORT;
    236 	}
    237 
    238 	/* XXX do we need more sanity checks? */
    239 
    240 	m->m_pkthdr.rcvif = ifp;
    241 	s = splnet();
    242 	if (IF_QFULL(ifq)) {
    243 		IF_DROP(ifq);
    244 		m_freem(m);
    245 		splx(s);
    246 		return (ENOBUFS);
    247 	}
    248 	IF_ENQUEUE(ifq, m);
    249 	schednetisr(isr);
    250 	ifp->if_ipackets++;
    251 	ifp->if_ibytes += m->m_pkthdr.len;
    252 	splx(s);
    253 	return (0);
    254 }
    255 
    256 /* ARGSUSED */
    257 static void
    258 faithrtrequest(cmd, rt, info)
    259 	int cmd;
    260 	struct rtentry *rt;
    261 	struct rt_addrinfo *info;
    262 {
    263 	if (rt) {
    264 		rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu; /* for ISO */
    265 		/*
    266 		 * For optimal performance, the send and receive buffers
    267 		 * should be at least twice the MTU plus a little more for
    268 		 * overhead.
    269 		 */
    270 		rt->rt_rmx.rmx_recvpipe =
    271 			rt->rt_rmx.rmx_sendpipe = 3 * FAITHMTU;
    272 	}
    273 }
    274 
    275 /*
    276  * Process an ioctl request.
    277  */
    278 /* ARGSUSED */
    279 static int
    280 faithioctl(ifp, cmd, data)
    281 	struct ifnet *ifp;
    282 	u_long cmd;
    283 	caddr_t data;
    284 {
    285 	struct ifaddr *ifa;
    286 	struct ifreq *ifr = (struct ifreq *)data;
    287 	int error = 0;
    288 
    289 	switch (cmd) {
    290 
    291 	case SIOCSIFADDR:
    292 		ifp->if_flags |= IFF_UP | IFF_RUNNING;
    293 		ifa = (struct ifaddr *)data;
    294 		ifa->ifa_rtrequest = faithrtrequest;
    295 		/*
    296 		 * Everything else is done at a higher level.
    297 		 */
    298 		break;
    299 
    300 	case SIOCADDMULTI:
    301 	case SIOCDELMULTI:
    302 		if (ifr == 0) {
    303 			error = EAFNOSUPPORT;		/* XXX */
    304 			break;
    305 		}
    306 		switch (ifr->ifr_addr.sa_family) {
    307 #ifdef INET
    308 		case AF_INET:
    309 			break;
    310 #endif
    311 #ifdef INET6
    312 		case AF_INET6:
    313 			break;
    314 #endif
    315 
    316 		default:
    317 			error = EAFNOSUPPORT;
    318 			break;
    319 		}
    320 		break;
    321 
    322 #ifdef SIOCSIFMTU
    323 	case SIOCSIFMTU:
    324 		ifp->if_mtu = ifr->ifr_mtu;
    325 		break;
    326 #endif
    327 
    328 	case SIOCSIFFLAGS:
    329 		break;
    330 
    331 	default:
    332 		error = EINVAL;
    333 	}
    334 	return (error);
    335 }
    336 
    337 /*
    338  * XXX could be slow
    339  * XXX could be layer violation to call sys/net from sys/netinet6
    340  */
    341 int
    342 faithprefix(in6)
    343 	struct in6_addr *in6;
    344 {
    345 	struct rtentry *rt;
    346 	struct sockaddr_in6 sin6;
    347 	int ret;
    348 
    349 	if (ip6_keepfaith == 0)
    350 		return 0;
    351 
    352 	memset(&sin6, 0, sizeof(sin6));
    353 	sin6.sin6_family = AF_INET6;
    354 	sin6.sin6_len = sizeof(struct sockaddr_in6);
    355 	sin6.sin6_addr = *in6;
    356 	rt = rtalloc1((struct sockaddr *)&sin6, 0);
    357 	if (rt && rt->rt_ifp && rt->rt_ifp->if_type == IFT_FAITH &&
    358 	    (rt->rt_ifp->if_flags & IFF_UP) != 0)
    359 		ret = 1;
    360 	else
    361 		ret = 0;
    362 	if (rt)
    363 		RTFREE(rt);
    364 	return ret;
    365 }
    366 #endif /* NFAITH > 0 */
    367