1/*	$KAME: if_faith.c,v 1.23 2001/12/17 13:55:29 sumikawa Exp $	*/
2
3/*-
4 * Copyright (c) 1982, 1986, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 4. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * $FreeBSD$
32 */
33/*
34 * derived from
35 *	@(#)if_loop.c	8.1 (Berkeley) 6/10/93
36 * Id: if_loop.c,v 1.22 1996/06/19 16:24:10 wollman Exp
37 */
38
39/*
40 * Loopback interface driver for protocol testing and timing.
41 */
42#include "opt_inet.h"
43#include "opt_inet6.h"
44
45#include <sys/param.h>
46#include <sys/systm.h>
47#include <sys/kernel.h>
48#include <sys/mbuf.h>
49#include <sys/module.h>
50#include <sys/socket.h>
51#include <sys/errno.h>
52#include <sys/sockio.h>
53#include <sys/time.h>
54#include <sys/queue.h>
55#include <sys/types.h>
56#include <sys/malloc.h>
57
58#include <net/if.h>
59#include <net/if_clone.h>
60#include <net/if_types.h>
61#include <net/netisr.h>
62#include <net/route.h>
63#include <net/bpf.h>
64#include <net/vnet.h>
65
66#ifdef	INET
67#include <netinet/in.h>
68#include <netinet/in_systm.h>
69#include <netinet/in_var.h>
70#include <netinet/ip.h>
71#endif
72
73#ifdef INET6
74#ifndef INET
75#include <netinet/in.h>
76#endif
77#include <netinet6/in6_var.h>
78#include <netinet/ip6.h>
79#include <netinet6/ip6_var.h>
80#endif
81
82#define FAITHNAME	"faith"
83
84struct faith_softc {
85	struct ifnet *sc_ifp;
86};
87
88static int faithioctl(struct ifnet *, u_long, caddr_t);
89int faithoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
90	struct route *);
91static void faithrtrequest(int, struct rtentry *, struct rt_addrinfo *);
92#ifdef INET6
93static int faithprefix(struct in6_addr *);
94#endif
95
96static int faithmodevent(module_t, int, void *);
97
98static MALLOC_DEFINE(M_FAITH, FAITHNAME, "Firewall Assisted Tunnel Interface");
99
100static int	faith_clone_create(struct if_clone *, int, caddr_t);
101static void	faith_clone_destroy(struct ifnet *);
102
103IFC_SIMPLE_DECLARE(faith, 0);
104
105#define	FAITHMTU	1500
106
107static int
108faithmodevent(mod, type, data)
109	module_t mod;
110	int type;
111	void *data;
112{
113
114	switch (type) {
115	case MOD_LOAD:
116		if_clone_attach(&faith_cloner);
117
118#ifdef INET6
119		faithprefix_p = faithprefix;
120#endif
121
122		break;
123	case MOD_UNLOAD:
124#ifdef INET6
125		faithprefix_p = NULL;
126#endif
127
128		if_clone_detach(&faith_cloner);
129		break;
130	default:
131		return EOPNOTSUPP;
132	}
133	return 0;
134}
135
136static moduledata_t faith_mod = {
137	"if_faith",
138	faithmodevent,
139	0
140};
141
142DECLARE_MODULE(if_faith, faith_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
143MODULE_VERSION(if_faith, 1);
144
145static int
146faith_clone_create(ifc, unit, params)
147	struct if_clone *ifc;
148	int unit;
149	caddr_t params;
150{
151	struct ifnet *ifp;
152	struct faith_softc *sc;
153
154	sc = malloc(sizeof(struct faith_softc), M_FAITH, M_WAITOK | M_ZERO);
155	ifp = sc->sc_ifp = if_alloc(IFT_FAITH);
156	if (ifp == NULL) {
157		free(sc, M_FAITH);
158		return (ENOSPC);
159	}
160
161	ifp->if_softc = sc;
162	if_initname(sc->sc_ifp, ifc->ifc_name, unit);
163
164	ifp->if_mtu = FAITHMTU;
165	/* Change to BROADCAST experimentaly to announce its prefix. */
166	ifp->if_flags = /* IFF_LOOPBACK */ IFF_BROADCAST | IFF_MULTICAST;
167	ifp->if_ioctl = faithioctl;
168	ifp->if_output = faithoutput;
169	ifp->if_hdrlen = 0;
170	ifp->if_addrlen = 0;
171	ifp->if_snd.ifq_maxlen = ifqmaxlen;
172	if_attach(ifp);
173	bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
174	return (0);
175}
176
177static void
178faith_clone_destroy(ifp)
179	struct ifnet *ifp;
180{
181	struct faith_softc *sc = ifp->if_softc;
182
183	bpfdetach(ifp);
184	if_detach(ifp);
185	if_free(ifp);
186	free(sc, M_FAITH);
187}
188
189int
190faithoutput(ifp, m, dst, ro)
191	struct ifnet *ifp;
192	struct mbuf *m;
193	struct sockaddr *dst;
194	struct route *ro;
195{
196	int isr;
197	u_int32_t af;
198	struct rtentry *rt = NULL;
199
200	M_ASSERTPKTHDR(m);
201
202	if (ro != NULL)
203		rt = ro->ro_rt;
204	/* BPF writes need to be handled specially. */
205	if (dst->sa_family == AF_UNSPEC) {
206		bcopy(dst->sa_data, &af, sizeof(af));
207		dst->sa_family = af;
208	}
209
210	if (bpf_peers_present(ifp->if_bpf)) {
211		af = dst->sa_family;
212		bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m);
213	}
214
215	if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
216		m_freem(m);
217		return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
218		        rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
219	}
220	ifp->if_opackets++;
221	ifp->if_obytes += m->m_pkthdr.len;
222	switch (dst->sa_family) {
223#ifdef INET
224	case AF_INET:
225		isr = NETISR_IP;
226		break;
227#endif
228#ifdef INET6
229	case AF_INET6:
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	ifp->if_ipackets++;
242	ifp->if_ibytes += m->m_pkthdr.len;
243	netisr_dispatch(isr, m);
244	return (0);
245}
246
247/* ARGSUSED */
248static void
249faithrtrequest(cmd, rt, info)
250	int cmd;
251	struct rtentry *rt;
252	struct rt_addrinfo *info;
253{
254	RT_LOCK_ASSERT(rt);
255	rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu;
256}
257
258/*
259 * Process an ioctl request.
260 */
261/* ARGSUSED */
262static int
263faithioctl(ifp, cmd, data)
264	struct ifnet *ifp;
265	u_long cmd;
266	caddr_t data;
267{
268	struct ifaddr *ifa;
269	struct ifreq *ifr = (struct ifreq *)data;
270	int error = 0;
271
272	switch (cmd) {
273
274	case SIOCSIFADDR:
275		ifp->if_flags |= IFF_UP;
276		ifp->if_drv_flags |= IFF_DRV_RUNNING;
277		ifa = (struct ifaddr *)data;
278		ifa->ifa_rtrequest = faithrtrequest;
279		/*
280		 * Everything else is done at a higher level.
281		 */
282		break;
283
284	case SIOCADDMULTI:
285	case SIOCDELMULTI:
286		if (ifr == 0) {
287			error = EAFNOSUPPORT;		/* XXX */
288			break;
289		}
290		switch (ifr->ifr_addr.sa_family) {
291#ifdef INET
292		case AF_INET:
293			break;
294#endif
295#ifdef INET6
296		case AF_INET6:
297			break;
298#endif
299
300		default:
301			error = EAFNOSUPPORT;
302			break;
303		}
304		break;
305
306#ifdef SIOCSIFMTU
307	case SIOCSIFMTU:
308		ifp->if_mtu = ifr->ifr_mtu;
309		break;
310#endif
311
312	case SIOCSIFFLAGS:
313		break;
314
315	default:
316		error = EINVAL;
317	}
318	return (error);
319}
320
321#ifdef INET6
322/*
323 * XXX could be slow
324 * XXX could be layer violation to call sys/net from sys/netinet6
325 */
326static int
327faithprefix(in6)
328	struct in6_addr *in6;
329{
330	struct rtentry *rt;
331	struct sockaddr_in6 sin6;
332	int ret;
333
334	if (V_ip6_keepfaith == 0)
335		return 0;
336
337	bzero(&sin6, sizeof(sin6));
338	sin6.sin6_family = AF_INET6;
339	sin6.sin6_len = sizeof(struct sockaddr_in6);
340	sin6.sin6_addr = *in6;
341	rt = in6_rtalloc1((struct sockaddr *)&sin6, 0, 0UL, RT_DEFAULT_FIB);
342	if (rt && rt->rt_ifp && rt->rt_ifp->if_type == IFT_FAITH &&
343	    (rt->rt_ifp->if_flags & IFF_UP) != 0)
344		ret = 1;
345	else
346		ret = 0;
347	if (rt)
348		RTFREE_LOCKED(rt);
349	return ret;
350}
351#endif
352