FreeBSD/Linux Kernel Cross Reference
sys/net/if_faith.c
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: releng/7.4/sys/net/if_faith.c 160981 2006-08-04 21:27:40Z brooks $
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 #define FAITHNAME "faith"
82
83 struct faith_softc {
84 struct ifnet *sc_ifp;
85 };
86
87 static int faithioctl(struct ifnet *, u_long, caddr_t);
88 int faithoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
89 struct rtentry *);
90 static void faithrtrequest(int, struct rtentry *, struct rt_addrinfo *);
91 #ifdef INET6
92 static int faithprefix(struct in6_addr *);
93 #endif
94
95 static int faithmodevent(module_t, int, void *);
96
97 static MALLOC_DEFINE(M_FAITH, FAITHNAME, "Firewall Assisted Tunnel Interface");
98
99 static int faith_clone_create(struct if_clone *, int, caddr_t);
100 static void faith_clone_destroy(struct ifnet *);
101
102 IFC_SIMPLE_DECLARE(faith, 0);
103
104 #define FAITHMTU 1500
105
106 static int
107 faithmodevent(mod, type, data)
108 module_t mod;
109 int type;
110 void *data;
111 {
112
113 switch (type) {
114 case MOD_LOAD:
115 if_clone_attach(&faith_cloner);
116
117 #ifdef INET6
118 faithprefix_p = faithprefix;
119 #endif
120
121 break;
122 case MOD_UNLOAD:
123 #ifdef INET6
124 faithprefix_p = NULL;
125 #endif
126
127 if_clone_detach(&faith_cloner);
128 break;
129 default:
130 return EOPNOTSUPP;
131 }
132 return 0;
133 }
134
135 static moduledata_t faith_mod = {
136 "if_faith",
137 faithmodevent,
138 0
139 };
140
141 DECLARE_MODULE(if_faith, faith_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
142 MODULE_VERSION(if_faith, 1);
143
144 static int
145 faith_clone_create(ifc, unit, params)
146 struct if_clone *ifc;
147 int unit;
148 caddr_t params;
149 {
150 struct ifnet *ifp;
151 struct faith_softc *sc;
152
153 sc = malloc(sizeof(struct faith_softc), M_FAITH, M_WAITOK | M_ZERO);
154 ifp = sc->sc_ifp = if_alloc(IFT_FAITH);
155 if (ifp == NULL) {
156 free(sc, M_FAITH);
157 return (ENOSPC);
158 }
159
160 ifp->if_softc = sc;
161 if_initname(sc->sc_ifp, ifc->ifc_name, unit);
162
163 ifp->if_mtu = FAITHMTU;
164 /* Change to BROADCAST experimentaly to announce its prefix. */
165 ifp->if_flags = /* IFF_LOOPBACK */ IFF_BROADCAST | IFF_MULTICAST;
166 ifp->if_ioctl = faithioctl;
167 ifp->if_output = faithoutput;
168 ifp->if_hdrlen = 0;
169 ifp->if_addrlen = 0;
170 ifp->if_snd.ifq_maxlen = ifqmaxlen;
171 if_attach(ifp);
172 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
173 return (0);
174 }
175
176 static void
177 faith_clone_destroy(ifp)
178 struct ifnet *ifp;
179 {
180 struct faith_softc *sc = ifp->if_softc;
181
182 bpfdetach(ifp);
183 if_detach(ifp);
184 if_free(ifp);
185 free(sc, M_FAITH);
186 }
187
188 int
189 faithoutput(ifp, m, dst, rt)
190 struct ifnet *ifp;
191 struct mbuf *m;
192 struct sockaddr *dst;
193 struct rtentry *rt;
194 {
195 int isr;
196 u_int32_t af;
197
198 M_ASSERTPKTHDR(m);
199
200 /* BPF writes need to be handled specially. */
201 if (dst->sa_family == AF_UNSPEC) {
202 bcopy(dst->sa_data, &af, sizeof(af));
203 dst->sa_family = af;
204 }
205
206 if (bpf_peers_present(ifp->if_bpf)) {
207 af = dst->sa_family;
208 bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m);
209 }
210
211 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
212 m_freem(m);
213 return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
214 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
215 }
216 ifp->if_opackets++;
217 ifp->if_obytes += m->m_pkthdr.len;
218 switch (dst->sa_family) {
219 #ifdef INET
220 case AF_INET:
221 isr = NETISR_IP;
222 break;
223 #endif
224 #ifdef INET6
225 case AF_INET6:
226 isr = NETISR_IPV6;
227 break;
228 #endif
229 default:
230 m_freem(m);
231 return EAFNOSUPPORT;
232 }
233
234 /* XXX do we need more sanity checks? */
235
236 m->m_pkthdr.rcvif = ifp;
237 ifp->if_ipackets++;
238 ifp->if_ibytes += m->m_pkthdr.len;
239 netisr_dispatch(isr, m);
240 return (0);
241 }
242
243 /* ARGSUSED */
244 static void
245 faithrtrequest(cmd, rt, info)
246 int cmd;
247 struct rtentry *rt;
248 struct rt_addrinfo *info;
249 {
250 RT_LOCK_ASSERT(rt);
251 rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu;
252 }
253
254 /*
255 * Process an ioctl request.
256 */
257 /* ARGSUSED */
258 static int
259 faithioctl(ifp, cmd, data)
260 struct ifnet *ifp;
261 u_long cmd;
262 caddr_t data;
263 {
264 struct ifaddr *ifa;
265 struct ifreq *ifr = (struct ifreq *)data;
266 int error = 0;
267
268 switch (cmd) {
269
270 case SIOCSIFADDR:
271 ifp->if_flags |= IFF_UP;
272 ifp->if_drv_flags |= IFF_DRV_RUNNING;
273 ifa = (struct ifaddr *)data;
274 ifa->ifa_rtrequest = faithrtrequest;
275 /*
276 * Everything else is done at a higher level.
277 */
278 break;
279
280 case SIOCADDMULTI:
281 case SIOCDELMULTI:
282 if (ifr == 0) {
283 error = EAFNOSUPPORT; /* XXX */
284 break;
285 }
286 switch (ifr->ifr_addr.sa_family) {
287 #ifdef INET
288 case AF_INET:
289 break;
290 #endif
291 #ifdef INET6
292 case AF_INET6:
293 break;
294 #endif
295
296 default:
297 error = EAFNOSUPPORT;
298 break;
299 }
300 break;
301
302 #ifdef SIOCSIFMTU
303 case SIOCSIFMTU:
304 ifp->if_mtu = ifr->ifr_mtu;
305 break;
306 #endif
307
308 case SIOCSIFFLAGS:
309 break;
310
311 default:
312 error = EINVAL;
313 }
314 return (error);
315 }
316
317 #ifdef INET6
318 /*
319 * XXX could be slow
320 * XXX could be layer violation to call sys/net from sys/netinet6
321 */
322 static int
323 faithprefix(in6)
324 struct in6_addr *in6;
325 {
326 struct rtentry *rt;
327 struct sockaddr_in6 sin6;
328 int ret;
329
330 if (ip6_keepfaith == 0)
331 return 0;
332
333 bzero(&sin6, sizeof(sin6));
334 sin6.sin6_family = AF_INET6;
335 sin6.sin6_len = sizeof(struct sockaddr_in6);
336 sin6.sin6_addr = *in6;
337 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL);
338 if (rt && rt->rt_ifp && rt->rt_ifp->if_type == IFT_FAITH &&
339 (rt->rt_ifp->if_flags & IFF_UP) != 0)
340 ret = 1;
341 else
342 ret = 0;
343 if (rt)
344 RTFREE_LOCKED(rt);
345 return ret;
346 }
347 #endif
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