if_faith.c revision 148887 
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: head/sys/net/if_faith.c 148887 2005-08-09 10:20:02Z rwatson $
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
65#ifdef	INET
66#include <netinet/in.h>
67#include <netinet/in_systm.h>
68#include <netinet/in_var.h>
69#include <netinet/ip.h>
70#endif
71
72#ifdef INET6
73#ifndef INET
74#include <netinet/in.h>
75#endif
76#include <netinet6/in6_var.h>
77#include <netinet/ip6.h>
78#include <netinet6/ip6_var.h>
79#endif
80
81#include <net/net_osdep.h>
82
83#define FAITHNAME	"faith"
84
85struct faith_softc {
86	struct ifnet *sc_ifp;
87	LIST_ENTRY(faith_softc) sc_list;
88};
89
90static int faithioctl(struct ifnet *, u_long, caddr_t);
91int faithoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
92	struct rtentry *);
93static void faithrtrequest(int, struct rtentry *, struct rt_addrinfo *);
94#ifdef INET6
95static int faithprefix(struct in6_addr *);
96#endif
97
98static int faithmodevent(module_t, int, void *);
99
100static struct mtx faith_mtx;
101static MALLOC_DEFINE(M_FAITH, FAITHNAME, "Firewall Assisted Tunnel Interface");
102static LIST_HEAD(, faith_softc) faith_softc_list;
103
104static int	faith_clone_create(struct if_clone *, int);
105static void	faith_clone_destroy(struct ifnet *);
106static void	faith_destroy(struct faith_softc *);
107
108IFC_SIMPLE_DECLARE(faith, 0);
109
110#define	FAITHMTU	1500
111
112static int
113faithmodevent(mod, type, data)
114	module_t mod;
115	int type;
116	void *data;
117{
118	struct faith_softc *sc;
119
120	switch (type) {
121	case MOD_LOAD:
122		mtx_init(&faith_mtx, "faith_mtx", NULL, MTX_DEF);
123		LIST_INIT(&faith_softc_list);
124		if_clone_attach(&faith_cloner);
125
126#ifdef INET6
127		faithprefix_p = faithprefix;
128#endif
129
130		break;
131	case MOD_UNLOAD:
132#ifdef INET6
133		faithprefix_p = NULL;
134#endif
135
136		if_clone_detach(&faith_cloner);
137
138		mtx_lock(&faith_mtx);
139		while ((sc = LIST_FIRST(&faith_softc_list)) != NULL) {
140			LIST_REMOVE(sc, sc_list);
141			mtx_unlock(&faith_mtx);
142			faith_destroy(sc);
143			mtx_lock(&faith_mtx);
144		}
145		mtx_unlock(&faith_mtx);
146		mtx_destroy(&faith_mtx);
147		break;
148	default:
149		return EOPNOTSUPP;
150	}
151	return 0;
152}
153
154static moduledata_t faith_mod = {
155	"if_faith",
156	faithmodevent,
157	0
158};
159
160DECLARE_MODULE(if_faith, faith_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
161MODULE_VERSION(if_faith, 1);
162
163static int
164faith_clone_create(ifc, unit)
165	struct if_clone *ifc;
166	int unit;
167{
168	struct ifnet *ifp;
169	struct faith_softc *sc;
170
171	sc = malloc(sizeof(struct faith_softc), M_FAITH, M_WAITOK | M_ZERO);
172	ifp = sc->sc_ifp = if_alloc(IFT_FAITH);
173	if (ifp == NULL) {
174		free(sc, M_FAITH);
175		return (ENOSPC);
176	}
177
178	ifp->if_softc = sc;
179	if_initname(sc->sc_ifp, ifc->ifc_name, unit);
180
181	ifp->if_mtu = FAITHMTU;
182	/* Change to BROADCAST experimentaly to announce its prefix. */
183	ifp->if_flags = /* IFF_LOOPBACK */ IFF_BROADCAST | IFF_MULTICAST;
184	ifp->if_ioctl = faithioctl;
185	ifp->if_output = faithoutput;
186	ifp->if_hdrlen = 0;
187	ifp->if_addrlen = 0;
188	ifp->if_snd.ifq_maxlen = ifqmaxlen;
189	if_attach(ifp);
190	bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
191	mtx_lock(&faith_mtx);
192	LIST_INSERT_HEAD(&faith_softc_list, sc, sc_list);
193	mtx_unlock(&faith_mtx);
194	return (0);
195}
196
197static void
198faith_destroy(struct faith_softc *sc)
199{
200
201	bpfdetach(sc->sc_ifp);
202	if_detach(sc->sc_ifp);
203	if_free(sc->sc_ifp);
204	free(sc, M_FAITH);
205}
206
207static void
208faith_clone_destroy(ifp)
209	struct ifnet *ifp;
210{
211	struct faith_softc *sc = ifp->if_softc;
212
213	mtx_lock(&faith_mtx);
214	LIST_REMOVE(sc, sc_list);
215	mtx_unlock(&faith_mtx);
216
217	faith_destroy(sc);
218}
219
220int
221faithoutput(ifp, m, dst, rt)
222	struct ifnet *ifp;
223	struct mbuf *m;
224	struct sockaddr *dst;
225	struct rtentry *rt;
226{
227	int isr;
228	u_int32_t af;
229
230	M_ASSERTPKTHDR(m);
231
232	/* BPF writes need to be handled specially. */
233	if (dst->sa_family == AF_UNSPEC) {
234		bcopy(dst->sa_data, &af, sizeof(af));
235		dst->sa_family = af;
236	}
237
238	if (ifp->if_bpf) {
239		af = dst->sa_family;
240		bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m);
241	}
242
243	if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
244		m_freem(m);
245		return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
246		        rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
247	}
248	ifp->if_opackets++;
249	ifp->if_obytes += m->m_pkthdr.len;
250	switch (dst->sa_family) {
251#ifdef INET
252	case AF_INET:
253		isr = NETISR_IP;
254		break;
255#endif
256#ifdef INET6
257	case AF_INET6:
258		isr = NETISR_IPV6;
259		break;
260#endif
261	default:
262		m_freem(m);
263		return EAFNOSUPPORT;
264	}
265
266	/* XXX do we need more sanity checks? */
267
268	m->m_pkthdr.rcvif = ifp;
269	ifp->if_ipackets++;
270	ifp->if_ibytes += m->m_pkthdr.len;
271	netisr_dispatch(isr, m);
272	return (0);
273}
274
275/* ARGSUSED */
276static void
277faithrtrequest(cmd, rt, info)
278	int cmd;
279	struct rtentry *rt;
280	struct rt_addrinfo *info;
281{
282	RT_LOCK_ASSERT(rt);
283	rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu;
284}
285
286/*
287 * Process an ioctl request.
288 */
289/* ARGSUSED */
290static int
291faithioctl(ifp, cmd, data)
292	struct ifnet *ifp;
293	u_long cmd;
294	caddr_t data;
295{
296	struct ifaddr *ifa;
297	struct ifreq *ifr = (struct ifreq *)data;
298	int error = 0;
299
300	switch (cmd) {
301
302	case SIOCSIFADDR:
303		ifp->if_flags |= IFF_UP;
304		ifp->if_drv_flags |= IFF_DRV_RUNNING;
305		ifa = (struct ifaddr *)data;
306		ifa->ifa_rtrequest = faithrtrequest;
307		/*
308		 * Everything else is done at a higher level.
309		 */
310		break;
311
312	case SIOCADDMULTI:
313	case SIOCDELMULTI:
314		if (ifr == 0) {
315			error = EAFNOSUPPORT;		/* XXX */
316			break;
317		}
318		switch (ifr->ifr_addr.sa_family) {
319#ifdef INET
320		case AF_INET:
321			break;
322#endif
323#ifdef INET6
324		case AF_INET6:
325			break;
326#endif
327
328		default:
329			error = EAFNOSUPPORT;
330			break;
331		}
332		break;
333
334#ifdef SIOCSIFMTU
335	case SIOCSIFMTU:
336		ifp->if_mtu = ifr->ifr_mtu;
337		break;
338#endif
339
340	case SIOCSIFFLAGS:
341		break;
342
343	default:
344		error = EINVAL;
345	}
346	return (error);
347}
348
349#ifdef INET6
350/*
351 * XXX could be slow
352 * XXX could be layer violation to call sys/net from sys/netinet6
353 */
354static int
355faithprefix(in6)
356	struct in6_addr *in6;
357{
358	struct rtentry *rt;
359	struct sockaddr_in6 sin6;
360	int ret;
361
362	if (ip6_keepfaith == 0)
363		return 0;
364
365	bzero(&sin6, sizeof(sin6));
366	sin6.sin6_family = AF_INET6;
367	sin6.sin6_len = sizeof(struct sockaddr_in6);
368	sin6.sin6_addr = *in6;
369	rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL);
370	if (rt && rt->rt_ifp && rt->rt_ifp->if_type == IFT_FAITH &&
371	    (rt->rt_ifp->if_flags & IFF_UP) != 0)
372		ret = 1;
373	else
374		ret = 0;
375	if (rt)
376		RTFREE_LOCKED(rt);
377	return ret;
378}
379#endif
380