1 /* $KAME: if_faith.c,v 1.23 2001/12/17 13:55:29 sumikawa Exp $ */
4 * Copyright (c) 1982, 1986, 1993
5 * The Regents of the University of California. All rights reserved.
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12 * 2. Redistributions in binary form must reproduce the above copyright
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15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by the University of
18 * California, Berkeley and its contributors.
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20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
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30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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35 * $FreeBSD: src/sys/net/if_faith.c,v 1.3.2.6 2002/04/28 05:40:25 suz Exp $
39 * @(#)if_loop.c 8.1 (Berkeley) 6/10/93
40 * Id: if_loop.c,v 1.22 1996/06/19 16:24:10 wollman Exp
44 * Loopback interface driver for protocol testing and timing.
50 #include "opt_inet6.h"
52 #include <sys/param.h>
53 #include <sys/systm.h>
54 #include <sys/kernel.h>
56 #include <sys/socket.h>
57 #include <sys/errno.h>
58 #include <sys/sockio.h>
60 #include <sys/queue.h>
61 #include <sys/types.h>
62 #include <sys/malloc.h>
63 #include <machine/bus.h> /* XXX: Shouldn't really be required! */
67 #include <net/if_types.h>
68 #include <net/netisr.h>
69 #include <net/route.h>
73 #include <netinet/in.h>
74 #include <netinet/in_systm.h>
75 #include <netinet/in_var.h>
76 #include <netinet/ip.h>
81 #include <netinet/in.h>
83 #include <netinet6/in6_var.h>
84 #include <netinet/ip6.h>
85 #include <netinet6/ip6_var.h>
88 #include <net/net_osdep.h>
90 #define FAITHNAME "faith"
91 #define FAITH_MAXUNIT 0x7fff /* ifp->if_unit is only 15 bits */
94 struct ifnet sc_if; /* must be first */
95 struct resource *r_unit;
96 LIST_ENTRY(faith_softc) sc_list;
99 static int faithioctl __P((struct ifnet *, u_long, caddr_t));
100 int faithoutput __P((struct ifnet *, struct mbuf *, struct sockaddr *,
102 static void faithrtrequest __P((int, struct rtentry *, struct rt_addrinfo *));
103 static int faithprefix __P((struct in6_addr *));
105 static int faithmodevent __P((module_t, int, void *));
107 static MALLOC_DEFINE(M_FAITH, FAITHNAME, "Firewall Assisted Tunnel Interface");
108 static struct rman faithunits[1];
109 LIST_HEAD(, faith_softc) faith_softc_list;
111 int faith_clone_create __P((struct if_clone *, int *));
112 void faith_clone_destroy __P((struct ifnet *));
114 struct if_clone faith_cloner =
115 IF_CLONE_INITIALIZER(FAITHNAME, faith_clone_create, faith_clone_destroy);
117 #define FAITHMTU 1500
120 faithmodevent(mod, type, data)
130 faithunits->rm_type = RMAN_ARRAY;
131 faithunits->rm_descr = "configurable if_faith units";
132 err = rman_init(faithunits);
135 err = rman_manage_region(faithunits, 0, FAITH_MAXUNIT);
137 printf("%s: faithunits: rman_manage_region: "
138 "Failed %d\n", FAITHNAME, err);
139 rman_fini(faithunits);
142 LIST_INIT(&faith_softc_list);
143 if_clone_attach(&faith_cloner);
144 for(i = 0; i < NFAITH; i ++) {
145 err = faith_clone_create(&faith_cloner, &i);
147 ("Error creating initial faith interfaces"));
151 faithprefix_p = faithprefix;
157 faithprefix_p = NULL;
160 if_clone_detach(&faith_cloner);
162 while (!LIST_EMPTY(&faith_softc_list))
164 &LIST_FIRST(&faith_softc_list)->sc_if);
166 err = rman_fini(faithunits);
175 static moduledata_t faith_mod = {
181 DECLARE_MODULE(if_faith, faith_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
182 MODULE_VERSION(if_faith, 1);
185 faith_clone_create(ifc, unit)
186 struct if_clone *ifc;
190 struct faith_softc *sc;
192 if (*unit > FAITH_MAXUNIT)
196 r = rman_reserve_resource(faithunits, 0, FAITH_MAXUNIT, 1,
197 RF_ALLOCATED | RF_ACTIVE, NULL);
200 *unit = rman_get_start(r);
202 r = rman_reserve_resource(faithunits, *unit, *unit, 1,
203 RF_ALLOCATED | RF_ACTIVE, NULL);
208 sc = malloc(sizeof(struct faith_softc), M_FAITH, M_WAITOK);
209 bzero(sc, sizeof(struct faith_softc));
211 sc->sc_if.if_softc = sc;
212 sc->sc_if.if_name = FAITHNAME;
213 sc->sc_if.if_unit = *unit;
216 sc->sc_if.if_mtu = FAITHMTU;
217 /* Change to BROADCAST experimentaly to announce its prefix. */
218 sc->sc_if.if_flags = /* IFF_LOOPBACK */ IFF_BROADCAST | IFF_MULTICAST;
219 sc->sc_if.if_ioctl = faithioctl;
220 sc->sc_if.if_output = faithoutput;
221 sc->sc_if.if_type = IFT_FAITH;
222 sc->sc_if.if_hdrlen = 0;
223 sc->sc_if.if_addrlen = 0;
224 sc->sc_if.if_snd.ifq_maxlen = ifqmaxlen;
225 if_attach(&sc->sc_if);
226 bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int));
227 LIST_INSERT_HEAD(&faith_softc_list, sc, sc_list);
232 faith_clone_destroy(ifp)
236 struct faith_softc *sc = (void *) ifp;
238 LIST_REMOVE(sc, sc_list);
242 err = rman_release_resource(sc->r_unit);
243 KASSERT(err == 0, ("Unexpected error freeing resource"));
249 faithoutput(ifp, m, dst, rt)
252 struct sockaddr *dst;
256 struct ifqueue *ifq = 0;
258 if ((m->m_flags & M_PKTHDR) == 0)
259 panic("faithoutput no HDR");
261 /* BPF write needs to be handled specially */
262 if (dst->sa_family == AF_UNSPEC) {
263 dst->sa_family = *(mtod(m, int *));
264 m->m_len -= sizeof(int);
265 m->m_pkthdr.len -= sizeof(int);
266 m->m_data += sizeof(int);
271 * We need to prepend the address family as
272 * a four byte field. Cons up a faith header
273 * to pacify bpf. This is safe because bpf
274 * will only read from the mbuf (i.e., it won't
275 * try to free it or keep a pointer a to it).
278 u_int32_t af = dst->sa_family;
282 m0.m_data = (char *)⁡
287 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
289 return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
290 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
293 ifp->if_obytes += m->m_pkthdr.len;
294 switch (dst->sa_family) {
312 /* XXX do we need more sanity checks? */
314 m->m_pkthdr.rcvif = ifp;
325 ifp->if_ibytes += m->m_pkthdr.len;
332 faithrtrequest(cmd, rt, info)
335 struct rt_addrinfo *info;
338 rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu; /* for ISO */
340 * For optimal performance, the send and receive buffers
341 * should be at least twice the MTU plus a little more for
344 rt->rt_rmx.rmx_recvpipe =
345 rt->rt_rmx.rmx_sendpipe = 3 * FAITHMTU;
350 * Process an ioctl request.
354 faithioctl(ifp, cmd, data)
360 struct ifreq *ifr = (struct ifreq *)data;
366 ifp->if_flags |= IFF_UP | IFF_RUNNING;
367 ifa = (struct ifaddr *)data;
368 ifa->ifa_rtrequest = faithrtrequest;
370 * Everything else is done at a higher level.
377 error = EAFNOSUPPORT; /* XXX */
380 switch (ifr->ifr_addr.sa_family) {
391 error = EAFNOSUPPORT;
398 ifp->if_mtu = ifr->ifr_mtu;
414 * XXX could be layer violation to call sys/net from sys/netinet6
418 struct in6_addr *in6;
421 struct sockaddr_in6 sin6;
424 if (ip6_keepfaith == 0)
427 bzero(&sin6, sizeof(sin6));
428 sin6.sin6_family = AF_INET6;
429 sin6.sin6_len = sizeof(struct sockaddr_in6);
430 sin6.sin6_addr = *in6;
431 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL);
432 if (rt && rt->rt_ifp && rt->rt_ifp->if_type == IFT_FAITH &&
433 (rt->rt_ifp->if_flags & IFF_UP) != 0)