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 * $FreeBSD$
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
84 struct faith_softc {
85 struct ifnet *sc_ifp;
86 };
87
88 static int faithioctl(struct ifnet *, u_long, caddr_t);
89 int faithoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
90 struct route *);
91 static void faithrtrequest(int, struct rtentry *, struct rt_addrinfo *);
92 #ifdef INET6
93 static int faithprefix(struct in6_addr *);
94 #endif
95
96 static int faithmodevent(module_t, int, void *);
97
98 static MALLOC_DEFINE(M_FAITH, FAITHNAME, "Firewall Assisted Tunnel Interface");
99
100 static int faith_clone_create(struct if_clone *, int, caddr_t);
101 static void faith_clone_destroy(struct ifnet *);
102
103 IFC_SIMPLE_DECLARE(faith, 0);
104
105 #define FAITHMTU 1500
106
107 static int
108 faithmodevent(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
136 static moduledata_t faith_mod = {
137 "if_faith",
138 faithmodevent,
139 0
140 };
141
142 DECLARE_MODULE(if_faith, faith_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
143 MODULE_VERSION(if_faith, 1);
144
145 static int
146 faith_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
177 static void
178 faith_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
189 int
190 faithoutput(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 */
248 static void
249 faithrtrequest(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 */
262 static int
263 faithioctl(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 */
326 static int
327 faithprefix(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
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