source: rtems/cpukit/libnetworking/net/if_loop.c @ df49c60

4.104.114.84.95
Last change on this file since df49c60 was df49c60, checked in by Joel Sherrill <joel.sherrill@…>, on Jun 12, 2000 at 3:00:15 PM

Merged from 4.5.0-beta3a

  • Property mode set to 100644
File size: 6.7 KB
Line 
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 * $Id$
35 */
36
37/*
38 * Loopback interface driver for protocol testing and timing.
39 */
40#include "loop.h"
41#if NLOOP > 0
42
43#include <sys/param.h>
44#include <sys/systm.h>
45#include <sys/kernel.h>
46#include <sys/mbuf.h>
47#include <sys/socket.h>
48#include <sys/errno.h>
49#include <sys/ioctl.h>
50#include <sys/time.h>
51
52#include <net/if.h>
53#include <net/if_types.h>
54#include <net/netisr.h>
55#include <net/route.h>
56#include <net/bpf.h>
57
58#ifdef  INET
59#include <netinet/in.h>
60#include <netinet/in_systm.h>
61#include <netinet/in_var.h>
62#include <netinet/ip.h>
63#endif
64
65#ifdef IPX
66#include <netipx/ipx.h>
67#include <netipx/ipx_if.h>
68#endif
69
70#ifdef NS
71#include <netns/ns.h>
72#include <netns/ns_if.h>
73#endif
74
75#ifdef ISO
76#include <netiso/iso.h>
77#include <netiso/iso_var.h>
78#endif
79
80#ifdef NETATALK
81#include <netinet/if_ether.h>
82#include <netatalk/at.h>
83#include <netatalk/at_var.h>
84#endif NETATALK
85
86#include "bpfilter.h"
87
88static int loioctl __P((struct ifnet *, int, caddr_t));
89static void lortrequest __P((int, struct rtentry *, struct sockaddr *));
90
91       void rtems_bsdnet_loopattach __P((void *));
92PSEUDO_SET(loopattach, if_loop);
93
94#ifdef TINY_LOMTU
95#define LOMTU   (1024+512)
96#else
97#define LOMTU   16384
98#endif
99
100struct  ifnet loif[NLOOP];
101
102/* ARGSUSED */
103void
104rtems_bsdnet_loopattach(dummy)
105        void *dummy;
106{
107        register struct ifnet *ifp;
108        register int i = 0;
109
110        for (ifp = loif; i < NLOOP; ifp++) {
111            ifp->if_name = "lo";
112            ifp->if_next = NULL;
113            ifp->if_unit = i++;
114            ifp->if_mtu = LOMTU;
115            ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST;
116            ifp->if_ioctl = loioctl;
117            ifp->if_output = looutput;
118            ifp->if_type = IFT_LOOP;
119            ifp->if_hdrlen = 0;
120            ifp->if_addrlen = 0;
121            ifp->if_snd.ifq_maxlen = ifqmaxlen;
122            if_attach(ifp);
123#if NBPFILTER > 0
124            bpfattach(ifp, DLT_NULL, sizeof(u_int));
125#endif
126        }
127}
128
129int
130looutput(ifp, m, dst, rt)
131        struct ifnet *ifp;
132        register struct mbuf *m;
133        struct sockaddr *dst;
134        register struct rtentry *rt;
135{
136        int s, isr;
137        register struct ifqueue *ifq = 0;
138
139        if ((m->m_flags & M_PKTHDR) == 0)
140                panic("looutput no HDR");
141#if NBPFILTER > 0
142        /* BPF write needs to be handled specially */
143        if (dst->sa_family == AF_UNSPEC) {
144                dst->sa_family = *(mtod(m, int *));
145                m->m_len -= sizeof(int);
146                m->m_pkthdr.len -= sizeof(int);
147                m->m_data += sizeof(int);
148        }
149
150        if (ifp->if_bpf) {
151                /*
152                 * We need to prepend the address family as
153                 * a four byte field.  Cons up a dummy header
154                 * to pacify bpf.  This is safe because bpf
155                 * will only read from the mbuf (i.e., it won't
156                 * try to free it or keep a pointer a to it).
157                 */
158                struct mbuf m0;
159                u_int af = dst->sa_family;
160
161                m0.m_next = m;
162                m0.m_len = 4;
163                m0.m_data = (char *)&af;
164
165                bpf_mtap(ifp, &m0);
166        }
167#endif
168        m->m_pkthdr.rcvif = ifp;
169
170        if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
171                m_freem(m);
172                return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
173                        rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
174        }
175        ifp->if_opackets++;
176        ifp->if_obytes += m->m_pkthdr.len;
177        switch (dst->sa_family) {
178
179#ifdef INET
180        case AF_INET:
181                ifq = &ipintrq;
182                isr = NETISR_IP;
183                break;
184#endif
185#ifdef IPX
186        case AF_IPX:
187                ifq = &ipxintrq;
188                isr = NETISR_IPX;
189                break;
190#endif
191#ifdef NS
192        case AF_NS:
193                ifq = &nsintrq;
194                isr = NETISR_NS;
195                break;
196#endif
197#ifdef ISO
198        case AF_ISO:
199                ifq = &clnlintrq;
200                isr = NETISR_ISO;
201                break;
202#endif
203#ifdef NETATALK
204        case AF_APPLETALK:
205                ifq = &atintrq2;
206                isr = NETISR_ATALK;
207                break;
208#endif NETATALK
209        default:
210                printf("lo%d: can't handle af%d\n", ifp->if_unit,
211                        dst->sa_family);
212                m_freem(m);
213                return (EAFNOSUPPORT);
214        }
215        s = splimp();
216        if (IF_QFULL(ifq)) {
217                IF_DROP(ifq);
218                m_freem(m);
219                splx(s);
220                return (ENOBUFS);
221        }
222        IF_ENQUEUE(ifq, m);
223        schednetisr(isr);
224        ifp->if_ipackets++;
225        ifp->if_ibytes += m->m_pkthdr.len;
226        splx(s);
227        return (0);
228}
229
230/* ARGSUSED */
231static void
232lortrequest(cmd, rt, sa)
233        int cmd;
234        struct rtentry *rt;
235        struct sockaddr *sa;
236{
237        if (rt) {
238                rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu; /* for ISO */
239                /*
240                 * For optimal performance, the send and receive buffers
241                 * should be at least twice the MTU plus a little more for
242                 * overhead.
243                 */
244                rt->rt_rmx.rmx_recvpipe = 
245                        rt->rt_rmx.rmx_sendpipe = 3 * LOMTU;
246        }
247}
248
249/*
250 * Process an ioctl request.
251 */
252/* ARGSUSED */
253static int
254loioctl(ifp, cmd, data)
255        register struct ifnet *ifp;
256        int cmd;
257        caddr_t data;
258{
259        register struct ifaddr *ifa;
260        register struct ifreq *ifr = (struct ifreq *)data;
261        register int error = 0;
262
263        switch (cmd) {
264
265        case SIOCSIFADDR:
266                ifp->if_flags |= IFF_UP | IFF_RUNNING;
267                ifa = (struct ifaddr *)data;
268                ifa->ifa_rtrequest = lortrequest;
269                /*
270                 * Everything else is done at a higher level.
271                 */
272                break;
273
274        case SIOCADDMULTI:
275        case SIOCDELMULTI:
276                if (ifr == 0) {
277                        error = EAFNOSUPPORT;           /* XXX */
278                        break;
279                }
280                switch (ifr->ifr_addr.sa_family) {
281
282#ifdef INET
283                case AF_INET:
284                        break;
285#endif
286
287                default:
288                        error = EAFNOSUPPORT;
289                        break;
290                }
291                break;
292
293        case SIOCSIFMTU:
294                ifp->if_mtu = ifr->ifr_mtu;
295                break;
296
297        default:
298                error = EINVAL;
299        }
300        return (error);
301}
302#endif /* NLOOP > 0 */
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