__P() removal
[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 $
158abb01 35 * $DragonFly: src/sys/net/if_loop.c,v 1.6 2003/08/26 20:49:47 rob 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>
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88#endif NETATALK
89
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90int loioctl (struct ifnet *, u_long, caddr_t);
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
111loopattach(dummy)
112 void *dummy;
113{
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114 struct ifnet *ifp;
115 int i = 0;
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116
117 for (ifp = loif; i < NLOOP; ifp++) {
118 ifp->if_name = "lo";
119 ifp->if_unit = i++;
120 ifp->if_mtu = LOMTU;
121 ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST;
122 ifp->if_ioctl = loioctl;
123 ifp->if_output = looutput;
124 ifp->if_type = IFT_LOOP;
125 ifp->if_snd.ifq_maxlen = ifqmaxlen;
126 if_attach(ifp);
127 bpfattach(ifp, DLT_NULL, sizeof(u_int));
128 }
129}
130
131int
132looutput(ifp, m, dst, rt)
133 struct ifnet *ifp;
82ed7fc2 134 struct mbuf *m;
984263bc 135 struct sockaddr *dst;
82ed7fc2 136 struct rtentry *rt;
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137{
138 struct mbuf *n;
139
140 if ((m->m_flags & M_PKTHDR) == 0)
141 panic("looutput no HDR");
142
143 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
144 m_freem(m);
145 return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
146 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
147 }
148 /*
149 * KAME requires that the packet to be contiguous on the
150 * mbuf. We need to make that sure.
151 * this kind of code should be avoided.
152 *
153 * XXX: KAME may no longer need contiguous packets. Once
154 * that has been verified, the following code _should_ be
155 * removed.
156 */
157 if (m && m->m_next != NULL) {
158
159 n = m_defrag(m, M_DONTWAIT);
160
161 if (n == NULL) {
162 m_freem(m);
163 return (ENOBUFS);
164 } else {
165 m = n;
166 }
167 }
168
169 ifp->if_opackets++;
170 ifp->if_obytes += m->m_pkthdr.len;
171#if 1 /* XXX */
172 switch (dst->sa_family) {
173 case AF_INET:
174 case AF_INET6:
175 case AF_IPX:
176 case AF_NS:
177 case AF_APPLETALK:
178 break;
179 default:
180 printf("looutput: af=%d unexpected\n", dst->sa_family);
181 m_freem(m);
182 return (EAFNOSUPPORT);
183 }
184#endif
185 return(if_simloop(ifp, m, dst->sa_family, 0));
186}
187
188/*
189 * if_simloop()
190 *
191 * This function is to support software emulation of hardware loopback,
192 * i.e., for interfaces with the IFF_SIMPLEX attribute. Since they can't
193 * hear their own broadcasts, we create a copy of the packet that we
194 * would normally receive via a hardware loopback.
195 *
196 * This function expects the packet to include the media header of length hlen.
197 */
198
199int
200if_simloop(ifp, m, af, hlen)
201 struct ifnet *ifp;
202 struct mbuf *m;
203 int af;
204 int hlen;
205{
206 int s, isr;
82ed7fc2 207 struct ifqueue *ifq = 0;
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208
209 KASSERT((m->m_flags & M_PKTHDR) != 0, ("if_simloop: no HDR"));
210 m->m_pkthdr.rcvif = ifp;
211
212 /* BPF write needs to be handled specially */
213 if (af == AF_UNSPEC) {
214 KASSERT(m->m_len >= sizeof(int), ("if_simloop: m_len"));
215 af = *(mtod(m, int *));
216 m->m_len -= sizeof(int);
217 m->m_pkthdr.len -= sizeof(int);
218 m->m_data += sizeof(int);
219 }
220
221 /* Let BPF see incoming packet */
222 if (ifp->if_bpf) {
223 struct mbuf m0, *n = m;
224
225 if (ifp->if_bpf->bif_dlt == DLT_NULL) {
226 /*
227 * We need to prepend the address family as
228 * a four byte field. Cons up a dummy header
229 * to pacify bpf. This is safe because bpf
230 * will only read from the mbuf (i.e., it won't
231 * try to free it or keep a pointer a to it).
232 */
233 m0.m_next = m;
234 m0.m_len = 4;
235 m0.m_data = (char *)&af;
236 n = &m0;
237 }
238 bpf_mtap(ifp, n);
239 }
240
241 /* Strip away media header */
242 if (hlen > 0) {
243 m_adj(m, hlen);
244#ifdef __alpha__
245 /* The alpha doesn't like unaligned data.
246 * We move data down in the first mbuf */
247 if (mtod(m, vm_offset_t) & 3) {
248 KASSERT(hlen >= 3, ("if_simloop: hlen too small"));
249 bcopy(m->m_data,
250 (char *)(mtod(m, vm_offset_t)
251 - (mtod(m, vm_offset_t) & 3)),
252 m->m_len);
253 mtod(m,vm_offset_t) -= (mtod(m, vm_offset_t) & 3);
254 }
255#endif
256 }
257
258 /* Deliver to upper layer protocol */
259 switch (af) {
260#ifdef INET
261 case AF_INET:
262 ifq = &ipintrq;
263 isr = NETISR_IP;
264 break;
265#endif
266#ifdef INET6
267 case AF_INET6:
268 m->m_flags |= M_LOOP;
269 ifq = &ip6intrq;
270 isr = NETISR_IPV6;
271 break;
272#endif
273#ifdef IPX
274 case AF_IPX:
275 ifq = &ipxintrq;
276 isr = NETISR_IPX;
277 break;
278#endif
279#ifdef NS
280 case AF_NS:
281 ifq = &nsintrq;
282 isr = NETISR_NS;
283 break;
284#endif
285#ifdef NETATALK
286 case AF_APPLETALK:
287 ifq = &atintrq2;
288 isr = NETISR_ATALK;
289 break;
290#endif NETATALK
291 default:
292 printf("if_simloop: can't handle af=%d\n", af);
293 m_freem(m);
294 return (EAFNOSUPPORT);
295 }
296 s = splimp();
297 if (IF_QFULL(ifq)) {
298 IF_DROP(ifq);
299 m_freem(m);
300 splx(s);
301 return (ENOBUFS);
302 }
303 IF_ENQUEUE(ifq, m);
304 schednetisr(isr);
305 ifp->if_ipackets++;
306 ifp->if_ibytes += m->m_pkthdr.len;
307 splx(s);
308 return (0);
309}
310
311/* ARGSUSED */
312static void
313lortrequest(cmd, rt, info)
314 int cmd;
315 struct rtentry *rt;
316 struct rt_addrinfo *info;
317{
318 if (rt) {
319 rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu; /* for ISO */
320 /*
321 * For optimal performance, the send and receive buffers
322 * should be at least twice the MTU plus a little more for
323 * overhead.
324 */
325 rt->rt_rmx.rmx_recvpipe =
326 rt->rt_rmx.rmx_sendpipe = 3 * LOMTU;
327 }
328}
329
330/*
331 * Process an ioctl request.
332 */
333/* ARGSUSED */
334int
335loioctl(ifp, cmd, data)
82ed7fc2 336 struct ifnet *ifp;
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337 u_long cmd;
338 caddr_t data;
339{
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340 struct ifaddr *ifa;
341 struct ifreq *ifr = (struct ifreq *)data;
342 int error = 0;
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343
344 switch (cmd) {
345
346 case SIOCSIFADDR:
347 ifp->if_flags |= IFF_UP | IFF_RUNNING;
348 ifa = (struct ifaddr *)data;
349 ifa->ifa_rtrequest = lortrequest;
350 /*
351 * Everything else is done at a higher level.
352 */
353 break;
354
355 case SIOCADDMULTI:
356 case SIOCDELMULTI:
357 if (ifr == 0) {
358 error = EAFNOSUPPORT; /* XXX */
359 break;
360 }
361 switch (ifr->ifr_addr.sa_family) {
362
363#ifdef INET
364 case AF_INET:
365 break;
366#endif
367#ifdef INET6
368 case AF_INET6:
369 break;
370#endif
371
372 default:
373 error = EAFNOSUPPORT;
374 break;
375 }
376 break;
377
378 case SIOCSIFMTU:
379 ifp->if_mtu = ifr->ifr_mtu;
380 break;
381
382 case SIOCSIFFLAGS:
383 break;
384
385 default:
386 error = EINVAL;
387 }
388 return (error);
389}