Remove unused variable.
[dragonfly.git] / sys / net / if_loop.c
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1/*
2 * Copyright (c) 1982, 1986, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)if_loop.c 8.1 (Berkeley) 6/10/93
34 * $FreeBSD: src/sys/net/if_loop.c,v 1.47.2.8 2003/06/01 01:46:11 silby Exp $
1f8e62c9 35 * $DragonFly: src/sys/net/if_loop.c,v 1.13 2005/01/26 00:37:39 joerg Exp $
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36 */
37
38/*
39 * Loopback interface driver for protocol testing and timing.
40 */
1f2de5d4 41#include "use_loop.h"
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42
43#include "opt_atalk.h"
44#include "opt_inet.h"
45#include "opt_inet6.h"
46#include "opt_ipx.h"
47
48#include <sys/param.h>
49#include <sys/systm.h>
50#include <sys/kernel.h>
51#include <sys/mbuf.h>
52#include <sys/socket.h>
53#include <sys/sockio.h>
54
55#include <net/if.h>
56#include <net/if_types.h>
57#include <net/netisr.h>
58#include <net/route.h>
59#include <net/bpf.h>
60#include <net/bpfdesc.h>
61
62#ifdef INET
63#include <netinet/in.h>
64#include <netinet/in_var.h>
65#endif
66
67#ifdef IPX
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68#include <netproto/ipx/ipx.h>
69#include <netproto/ipx/ipx_if.h>
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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#endif
79
80#ifdef NS
81#include <netns/ns.h>
82#include <netns/ns_if.h>
83#endif
84
85#ifdef NETATALK
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86#include <netproto/atalk/at.h>
87#include <netproto/atalk/at_var.h>
f7ea898e 88#endif
984263bc 89
bd4539cc 90int loioctl (struct ifnet *, u_long, caddr_t, struct ucred *);
158abb01 91static void lortrequest (int, struct rtentry *, struct rt_addrinfo *);
984263bc 92
158abb01 93static void loopattach (void *);
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94PSEUDO_SET(loopattach, if_loop);
95
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96int looutput (struct ifnet *ifp,
97 struct mbuf *m, struct sockaddr *dst, struct rtentry *rt);
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98
99#ifdef TINY_LOMTU
100#define LOMTU (1024+512)
101#elif defined(LARGE_LOMTU)
102#define LOMTU 131072
103#else
104#define LOMTU 16384
105#endif
106
107struct ifnet loif[NLOOP];
108
109/* ARGSUSED */
110static void
f23061d4 111loopattach(void *dummy)
984263bc 112{
82ed7fc2 113 struct ifnet *ifp;
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114 int i;
115
116 for (i = 0, ifp = loif; i < NLOOP; i++, ifp++) {
117 if_initname(ifp, "lo", i);
118 ifp->if_mtu = LOMTU;
119 ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST;
120 ifp->if_ioctl = loioctl;
121 ifp->if_output = looutput;
122 ifp->if_type = IFT_LOOP;
123 ifp->if_snd.ifq_maxlen = ifqmaxlen;
124 if_attach(ifp);
125 bpfattach(ifp, DLT_NULL, sizeof(u_int));
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126 }
127}
128
129int
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130looutput(
131 struct ifnet *ifp,
132 struct mbuf *m,
133 struct sockaddr *dst,
134 struct rtentry *rt)
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135{
136 struct mbuf *n;
137
138 if ((m->m_flags & M_PKTHDR) == 0)
139 panic("looutput no HDR");
140
141 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
142 m_freem(m);
143 return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
144 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
145 }
146 /*
147 * KAME requires that the packet to be contiguous on the
148 * mbuf. We need to make that sure.
149 * this kind of code should be avoided.
150 *
151 * XXX: KAME may no longer need contiguous packets. Once
152 * that has been verified, the following code _should_ be
153 * removed.
154 */
155 if (m && m->m_next != NULL) {
156
74f1caca 157 n = m_defrag(m, MB_DONTWAIT);
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158
159 if (n == NULL) {
160 m_freem(m);
161 return (ENOBUFS);
162 } else {
163 m = n;
164 }
165 }
166
167 ifp->if_opackets++;
168 ifp->if_obytes += m->m_pkthdr.len;
169#if 1 /* XXX */
170 switch (dst->sa_family) {
171 case AF_INET:
172 case AF_INET6:
173 case AF_IPX:
174 case AF_NS:
175 case AF_APPLETALK:
176 break;
177 default:
178 printf("looutput: af=%d unexpected\n", dst->sa_family);
179 m_freem(m);
180 return (EAFNOSUPPORT);
181 }
182#endif
f23061d4 183 return (if_simloop(ifp, m, dst->sa_family, 0));
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184}
185
186/*
187 * if_simloop()
188 *
189 * This function is to support software emulation of hardware loopback,
190 * i.e., for interfaces with the IFF_SIMPLEX attribute. Since they can't
191 * hear their own broadcasts, we create a copy of the packet that we
192 * would normally receive via a hardware loopback.
193 *
194 * This function expects the packet to include the media header of length hlen.
195 */
984263bc 196int
f23061d4 197if_simloop(struct ifnet *ifp, struct mbuf *m, int af, int hlen)
984263bc 198{
8bde602d 199 int isr;
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200
201 KASSERT((m->m_flags & M_PKTHDR) != 0, ("if_simloop: no HDR"));
202 m->m_pkthdr.rcvif = ifp;
203
204 /* BPF write needs to be handled specially */
205 if (af == AF_UNSPEC) {
206 KASSERT(m->m_len >= sizeof(int), ("if_simloop: m_len"));
207 af = *(mtod(m, int *));
208 m->m_len -= sizeof(int);
209 m->m_pkthdr.len -= sizeof(int);
210 m->m_data += sizeof(int);
211 }
212
984263bc 213 if (ifp->if_bpf) {
984263bc 214 if (ifp->if_bpf->bif_dlt == DLT_NULL) {
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215 uint32_t bpf_af = (uint32_t)af;
216 bpf_ptap(ifp->if_bpf, m, &bpf_af, 4);
217 }
218 else {
219 bpf_mtap(ifp->if_bpf, m);
984263bc 220 }
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221 }
222
223 /* Strip away media header */
224 if (hlen > 0) {
225 m_adj(m, hlen);
226#ifdef __alpha__
227 /* The alpha doesn't like unaligned data.
228 * We move data down in the first mbuf */
229 if (mtod(m, vm_offset_t) & 3) {
230 KASSERT(hlen >= 3, ("if_simloop: hlen too small"));
231 bcopy(m->m_data,
232 (char *)(mtod(m, vm_offset_t)
233 - (mtod(m, vm_offset_t) & 3)),
234 m->m_len);
235 mtod(m,vm_offset_t) -= (mtod(m, vm_offset_t) & 3);
236 }
237#endif
238 }
239
240 /* Deliver to upper layer protocol */
241 switch (af) {
242#ifdef INET
243 case AF_INET:
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244 isr = NETISR_IP;
245 break;
246#endif
247#ifdef INET6
248 case AF_INET6:
249 m->m_flags |= M_LOOP;
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250 isr = NETISR_IPV6;
251 break;
252#endif
253#ifdef IPX
254 case AF_IPX:
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255 isr = NETISR_IPX;
256 break;
257#endif
258#ifdef NS
259 case AF_NS:
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260 isr = NETISR_NS;
261 break;
262#endif
263#ifdef NETATALK
264 case AF_APPLETALK:
8bde602d 265 isr = NETISR_ATALK2;
984263bc 266 break;
f7ea898e 267#endif
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268 default:
269 printf("if_simloop: can't handle af=%d\n", af);
270 m_freem(m);
271 return (EAFNOSUPPORT);
272 }
8bde602d 273
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274 ifp->if_ipackets++;
275 ifp->if_ibytes += m->m_pkthdr.len;
8bde602d 276 netisr_queue(isr, m);
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277 return (0);
278}
279
280/* ARGSUSED */
281static void
f23061d4 282lortrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info)
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283{
284 if (rt) {
285 rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu; /* for ISO */
286 /*
287 * For optimal performance, the send and receive buffers
288 * should be at least twice the MTU plus a little more for
289 * overhead.
290 */
f23061d4 291 rt->rt_rmx.rmx_recvpipe = rt->rt_rmx.rmx_sendpipe = 3 * LOMTU;
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292 }
293}
294
295/*
296 * Process an ioctl request.
297 */
298/* ARGSUSED */
299int
f23061d4 300loioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr)
984263bc 301{
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302 struct ifaddr *ifa;
303 struct ifreq *ifr = (struct ifreq *)data;
304 int error = 0;
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305
306 switch (cmd) {
307
308 case SIOCSIFADDR:
309 ifp->if_flags |= IFF_UP | IFF_RUNNING;
310 ifa = (struct ifaddr *)data;
311 ifa->ifa_rtrequest = lortrequest;
312 /*
313 * Everything else is done at a higher level.
314 */
315 break;
316
317 case SIOCADDMULTI:
318 case SIOCDELMULTI:
319 if (ifr == 0) {
320 error = EAFNOSUPPORT; /* XXX */
321 break;
322 }
323 switch (ifr->ifr_addr.sa_family) {
324
325#ifdef INET
326 case AF_INET:
327 break;
328#endif
329#ifdef INET6
330 case AF_INET6:
331 break;
332#endif
333
334 default:
335 error = EAFNOSUPPORT;
336 break;
337 }
338 break;
339
340 case SIOCSIFMTU:
341 ifp->if_mtu = ifr->ifr_mtu;
342 break;
343
344 case SIOCSIFFLAGS:
345 break;
346
347 default:
348 error = EINVAL;
349 }
350 return (error);
351}