FreeBSD/Linux Kernel Cross Reference
sys/net/if_faith.c
1 /* $NetBSD: if_faith.c,v 1.44 2008/10/24 17:07:33 dyoung Exp $ */
2 /* $KAME: if_faith.c,v 1.21 2001/02/20 07:59:26 itojun Exp $ */
3
4 /*
5 * Copyright (c) 1982, 1986, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32 /*
33 * derived from
34 * @(#)if_loop.c 8.1 (Berkeley) 6/10/93
35 * Id: if_loop.c,v 1.22 1996/06/19 16:24:10 wollman Exp
36 */
37
38 /*
39 * IPv6-to-IPv4 TCP relay capturing interface
40 */
41
42 #include <sys/cdefs.h>
43 __KERNEL_RCSID(0, "$NetBSD: if_faith.c,v 1.44 2008/10/24 17:07:33 dyoung Exp $");
44
45 #include "opt_inet.h"
46
47 #include <sys/param.h>
48 #include <sys/systm.h>
49 #include <sys/kernel.h>
50 #include <sys/mbuf.h>
51 #include <sys/socket.h>
52 #include <sys/errno.h>
53 #include <sys/ioctl.h>
54 #include <sys/time.h>
55 #include <sys/queue.h>
56
57 #include <sys/cpu.h>
58
59 #include <net/if.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/if_faith.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 #include "bpfilter.h"
83
84 #include <net/net_osdep.h>
85
86 static int faithioctl(struct ifnet *, u_long, void *);
87 static int faithoutput(struct ifnet *, struct mbuf *,
88 const struct sockaddr *, struct rtentry *);
89 static void faithrtrequest(int, struct rtentry *,
90 const struct rt_addrinfo *);
91
92 void faithattach(int);
93
94 static int faith_clone_create(struct if_clone *, int);
95 static int faith_clone_destroy(struct ifnet *);
96
97 static struct if_clone faith_cloner =
98 IF_CLONE_INITIALIZER("faith", faith_clone_create, faith_clone_destroy);
99
100 #define FAITHMTU 1500
101
102 /* ARGSUSED */
103 void
104 faithattach(int count)
105 {
106
107 if_clone_attach(&faith_cloner);
108 }
109
110 static int
111 faith_clone_create(struct if_clone *ifc, int unit)
112 {
113 struct ifnet *ifp;
114
115 ifp = if_alloc(IFT_FAITH);
116
117 if_initname(ifp, ifc->ifc_name, unit);
118
119 ifp->if_mtu = FAITHMTU;
120 /* Change to BROADCAST experimentaly to announce its prefix. */
121 ifp->if_flags = /* IFF_LOOPBACK */ IFF_BROADCAST | IFF_MULTICAST;
122 ifp->if_ioctl = faithioctl;
123 ifp->if_output = faithoutput;
124 ifp->if_type = IFT_FAITH;
125 ifp->if_hdrlen = 0;
126 ifp->if_addrlen = 0;
127 ifp->if_dlt = DLT_NULL;
128 if_attach(ifp);
129 if_alloc_sadl(ifp);
130 #if NBPFILTER > 0
131 bpfattach(ifp, DLT_NULL, sizeof(u_int));
132 #endif
133 return (0);
134 }
135
136 int
137 faith_clone_destroy(struct ifnet *ifp)
138 {
139
140 #if NBPFILTER > 0
141 bpfdetach(ifp);
142 #endif
143 if_detach(ifp);
144 free(ifp, M_DEVBUF);
145
146 return (0);
147 }
148
149 static int
150 faithoutput(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
151 struct rtentry *rt)
152 {
153 int s, isr;
154 uint32_t af;
155 struct ifqueue *ifq = 0;
156
157 if ((m->m_flags & M_PKTHDR) == 0)
158 panic("faithoutput no HDR");
159 af = dst->sa_family;
160 #if NBPFILTER > 0
161 /* BPF write needs to be handled specially */
162 if (af == AF_UNSPEC) {
163 af = *(mtod(m, int *));
164 m_adj(m, sizeof(int));
165 }
166
167 if (ifp->if_bpf)
168 bpf_mtap_af(ifp->if_bpf, af, m);
169 #endif
170
171 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
172 m_freem(m);
173 return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
174 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
175 }
176 ifp->if_opackets++;
177 ifp->if_obytes += m->m_pkthdr.len;
178 switch (af) {
179 #ifdef INET
180 case AF_INET:
181 ifq = &ipintrq;
182 isr = NETISR_IP;
183 break;
184 #endif
185 #ifdef INET6
186 case AF_INET6:
187 ifq = &ip6intrq;
188 isr = NETISR_IPV6;
189 break;
190 #endif
191 default:
192 m_freem(m);
193 return EAFNOSUPPORT;
194 }
195
196 /* XXX do we need more sanity checks? */
197
198 m->m_pkthdr.rcvif = ifp;
199 s = splnet();
200 if (IF_QFULL(ifq)) {
201 IF_DROP(ifq);
202 m_freem(m);
203 splx(s);
204 return (ENOBUFS);
205 }
206 IF_ENQUEUE(ifq, m);
207 schednetisr(isr);
208 ifp->if_ipackets++;
209 ifp->if_ibytes += m->m_pkthdr.len;
210 splx(s);
211 return (0);
212 }
213
214 /* ARGSUSED */
215 static void
216 faithrtrequest(int cmd, struct rtentry *rt,
217 const struct rt_addrinfo *info)
218 {
219 if (rt)
220 rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu; /* for ISO */
221 }
222
223 /*
224 * Process an ioctl request.
225 */
226 /* ARGSUSED */
227 static int
228 faithioctl(struct ifnet *ifp, u_long cmd, void *data)
229 {
230 struct ifaddr *ifa;
231 struct ifreq *ifr = (struct ifreq *)data;
232 int error = 0;
233
234 switch (cmd) {
235
236 case SIOCSIFADDR:
237 ifp->if_flags |= IFF_UP | IFF_RUNNING;
238 ifa = (struct ifaddr *)data;
239 ifa->ifa_rtrequest = faithrtrequest;
240 /*
241 * Everything else is done at a higher level.
242 */
243 break;
244
245 case SIOCADDMULTI:
246 case SIOCDELMULTI:
247 if (ifr == 0) {
248 error = EAFNOSUPPORT; /* XXX */
249 break;
250 }
251 switch (ifr->ifr_addr.sa_family) {
252 #ifdef INET
253 case AF_INET:
254 break;
255 #endif
256 #ifdef INET6
257 case AF_INET6:
258 break;
259 #endif
260
261 default:
262 error = EAFNOSUPPORT;
263 break;
264 }
265 break;
266
267 #ifdef SIOCSIFMTU
268 case SIOCSIFMTU:
269 if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET)
270 error = 0;
271 break;
272 #endif
273
274 case SIOCSIFFLAGS:
275 break;
276
277 default:
278 error = EINVAL;
279 }
280 return (error);
281 }
282
283 #ifdef INET6
284 /*
285 * XXX could be slow
286 * XXX could be layer violation to call sys/net from sys/netinet6
287 */
288 int
289 faithprefix(struct in6_addr *in6)
290 {
291 struct rtentry *rt;
292 struct sockaddr_in6 sin6;
293 int ret;
294
295 if (ip6_keepfaith == 0)
296 return 0;
297
298 memset(&sin6, 0, sizeof(sin6));
299 sin6.sin6_family = AF_INET6;
300 sin6.sin6_len = sizeof(struct sockaddr_in6);
301 sin6.sin6_addr = *in6;
302 rt = rtalloc1((struct sockaddr *)&sin6, 0);
303 if (rt && rt->rt_ifp && rt->rt_ifp->if_type == IFT_FAITH &&
304 (rt->rt_ifp->if_flags & IFF_UP) != 0)
305 ret = 1;
306 else
307 ret = 0;
308 if (rt)
309 RTFREE(rt);
310 return ret;
311 }
312 #endif
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