Change mbug allocation flags from M_ to MB_ to avoid confusion with malloc
[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 $
74f1caca 35 * $DragonFly: src/sys/net/if_loop.c,v 1.11 2004/06/02 14:42:57 eirikn 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
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++) {
3e4a09e7 118 if_initname(ifp, "lo", i++);
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119 ifp->if_mtu = LOMTU;
120 ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST;
121 ifp->if_ioctl = loioctl;
122 ifp->if_output = looutput;
123 ifp->if_type = IFT_LOOP;
124 ifp->if_snd.ifq_maxlen = ifqmaxlen;
125 if_attach(ifp);
126 bpfattach(ifp, DLT_NULL, sizeof(u_int));
127 }
128}
129
130int
131looutput(ifp, m, dst, rt)
132 struct ifnet *ifp;
82ed7fc2 133 struct mbuf *m;
984263bc 134 struct sockaddr *dst;
82ed7fc2 135 struct rtentry *rt;
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136{
137 struct mbuf *n;
138
139 if ((m->m_flags & M_PKTHDR) == 0)
140 panic("looutput no HDR");
141
142 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
143 m_freem(m);
144 return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
145 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
146 }
147 /*
148 * KAME requires that the packet to be contiguous on the
149 * mbuf. We need to make that sure.
150 * this kind of code should be avoided.
151 *
152 * XXX: KAME may no longer need contiguous packets. Once
153 * that has been verified, the following code _should_ be
154 * removed.
155 */
156 if (m && m->m_next != NULL) {
157
74f1caca 158 n = m_defrag(m, MB_DONTWAIT);
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159
160 if (n == NULL) {
161 m_freem(m);
162 return (ENOBUFS);
163 } else {
164 m = n;
165 }
166 }
167
168 ifp->if_opackets++;
169 ifp->if_obytes += m->m_pkthdr.len;
170#if 1 /* XXX */
171 switch (dst->sa_family) {
172 case AF_INET:
173 case AF_INET6:
174 case AF_IPX:
175 case AF_NS:
176 case AF_APPLETALK:
177 break;
178 default:
179 printf("looutput: af=%d unexpected\n", dst->sa_family);
180 m_freem(m);
181 return (EAFNOSUPPORT);
182 }
183#endif
184 return(if_simloop(ifp, m, dst->sa_family, 0));
185}
186
187/*
188 * if_simloop()
189 *
190 * This function is to support software emulation of hardware loopback,
191 * i.e., for interfaces with the IFF_SIMPLEX attribute. Since they can't
192 * hear their own broadcasts, we create a copy of the packet that we
193 * would normally receive via a hardware loopback.
194 *
195 * This function expects the packet to include the media header of length hlen.
196 */
197
198int
199if_simloop(ifp, m, af, hlen)
200 struct ifnet *ifp;
201 struct mbuf *m;
202 int af;
203 int hlen;
204{
8bde602d 205 int isr;
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206
207 KASSERT((m->m_flags & M_PKTHDR) != 0, ("if_simloop: no HDR"));
208 m->m_pkthdr.rcvif = ifp;
209
210 /* BPF write needs to be handled specially */
211 if (af == AF_UNSPEC) {
212 KASSERT(m->m_len >= sizeof(int), ("if_simloop: m_len"));
213 af = *(mtod(m, int *));
214 m->m_len -= sizeof(int);
215 m->m_pkthdr.len -= sizeof(int);
216 m->m_data += sizeof(int);
217 }
218
219 /* Let BPF see incoming packet */
220 if (ifp->if_bpf) {
221 struct mbuf m0, *n = m;
222
223 if (ifp->if_bpf->bif_dlt == DLT_NULL) {
224 /*
225 * We need to prepend the address family as
226 * a four byte field. Cons up a dummy header
227 * to pacify bpf. This is safe because bpf
228 * will only read from the mbuf (i.e., it won't
229 * try to free it or keep a pointer a to it).
230 */
231 m0.m_next = m;
232 m0.m_len = 4;
233 m0.m_data = (char *)&af;
234 n = &m0;
235 }
236 bpf_mtap(ifp, n);
237 }
238
239 /* Strip away media header */
240 if (hlen > 0) {
241 m_adj(m, hlen);
242#ifdef __alpha__
243 /* The alpha doesn't like unaligned data.
244 * We move data down in the first mbuf */
245 if (mtod(m, vm_offset_t) & 3) {
246 KASSERT(hlen >= 3, ("if_simloop: hlen too small"));
247 bcopy(m->m_data,
248 (char *)(mtod(m, vm_offset_t)
249 - (mtod(m, vm_offset_t) & 3)),
250 m->m_len);
251 mtod(m,vm_offset_t) -= (mtod(m, vm_offset_t) & 3);
252 }
253#endif
254 }
255
256 /* Deliver to upper layer protocol */
257 switch (af) {
258#ifdef INET
259 case AF_INET:
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260 isr = NETISR_IP;
261 break;
262#endif
263#ifdef INET6
264 case AF_INET6:
265 m->m_flags |= M_LOOP;
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266 isr = NETISR_IPV6;
267 break;
268#endif
269#ifdef IPX
270 case AF_IPX:
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271 isr = NETISR_IPX;
272 break;
273#endif
274#ifdef NS
275 case AF_NS:
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276 isr = NETISR_NS;
277 break;
278#endif
279#ifdef NETATALK
280 case AF_APPLETALK:
8bde602d 281 isr = NETISR_ATALK2;
984263bc 282 break;
f7ea898e 283#endif
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284 default:
285 printf("if_simloop: can't handle af=%d\n", af);
286 m_freem(m);
287 return (EAFNOSUPPORT);
288 }
8bde602d 289
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290 ifp->if_ipackets++;
291 ifp->if_ibytes += m->m_pkthdr.len;
8bde602d 292 netisr_queue(isr, m);
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293 return (0);
294}
295
296/* ARGSUSED */
297static void
298lortrequest(cmd, rt, info)
299 int cmd;
300 struct rtentry *rt;
301 struct rt_addrinfo *info;
302{
303 if (rt) {
304 rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu; /* for ISO */
305 /*
306 * For optimal performance, the send and receive buffers
307 * should be at least twice the MTU plus a little more for
308 * overhead.
309 */
310 rt->rt_rmx.rmx_recvpipe =
311 rt->rt_rmx.rmx_sendpipe = 3 * LOMTU;
312 }
313}
314
315/*
316 * Process an ioctl request.
317 */
318/* ARGSUSED */
319int
bd4539cc 320loioctl(ifp, cmd, data, cr)
82ed7fc2 321 struct ifnet *ifp;
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322 u_long cmd;
323 caddr_t data;
bd4539cc 324 struct ucred *cr;
984263bc 325{
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326 struct ifaddr *ifa;
327 struct ifreq *ifr = (struct ifreq *)data;
328 int error = 0;
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329
330 switch (cmd) {
331
332 case SIOCSIFADDR:
333 ifp->if_flags |= IFF_UP | IFF_RUNNING;
334 ifa = (struct ifaddr *)data;
335 ifa->ifa_rtrequest = lortrequest;
336 /*
337 * Everything else is done at a higher level.
338 */
339 break;
340
341 case SIOCADDMULTI:
342 case SIOCDELMULTI:
343 if (ifr == 0) {
344 error = EAFNOSUPPORT; /* XXX */
345 break;
346 }
347 switch (ifr->ifr_addr.sa_family) {
348
349#ifdef INET
350 case AF_INET:
351 break;
352#endif
353#ifdef INET6
354 case AF_INET6:
355 break;
356#endif
357
358 default:
359 error = EAFNOSUPPORT;
360 break;
361 }
362 break;
363
364 case SIOCSIFMTU:
365 ifp->if_mtu = ifr->ifr_mtu;
366 break;
367
368 case SIOCSIFFLAGS:
369 break;
370
371 default:
372 error = EINVAL;
373 }
374 return (error);
375}