source: rtems-libbsd/freebsd/sys/net/if_loop.c @ 6d9d7b1

55-freebsd-126-freebsd-12
Last change on this file since 6d9d7b1 was 0237319, checked in by Sebastian Huber <sebastian.huber@…>, on 05/23/17 at 11:18:31

Update due to Newlib 2017-06-07 changes

The following files are now provided by Newlib:

  • arpa/inet.h
  • net/if.h
  • netinet/in.h
  • netinet/tcp.h
  • sys/socket.h
  • sys/uio.h
  • sys/un.h

The <sys/param.h> and <sys/cpuset.h> are now compatible enough to be
used directly.

Update #2833.

  • Property mode set to 100644
File size: 10.5 KB
Line 
1#include <machine/rtems-bsd-kernel-space.h>
2
3/*-
4 * Copyright (c) 1982, 1986, 1993
5 *      The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 *      @(#)if_loop.c   8.2 (Berkeley) 1/9/95
32 * $FreeBSD$
33 */
34
35/*
36 * Loopback interface driver for protocol testing and timing.
37 */
38
39#include <rtems/bsd/local/opt_inet.h>
40#include <rtems/bsd/local/opt_inet6.h>
41#include <rtems/bsd/local/opt_rss.h>
42
43#include <sys/param.h>
44#include <sys/systm.h>
45#include <sys/kernel.h>
46#include <sys/mbuf.h>
47#include <sys/module.h>
48#include <machine/bus.h>
49#include <sys/rman.h>
50#include <sys/socket.h>
51#include <sys/sockio.h>
52#include <sys/sysctl.h>
53
54#include <net/if.h>
55#include <net/if_var.h>
56#include <net/if_clone.h>
57#include <net/if_types.h>
58#include <net/netisr.h>
59#include <net/route.h>
60#include <net/bpf.h>
61#include <net/vnet.h>
62
63#ifdef  INET
64#include <netinet/in.h>
65#include <netinet/in_var.h>
66#endif
67
68#ifdef INET6
69#ifndef INET
70#include <netinet/in.h>
71#endif
72#include <netinet6/in6_var.h>
73#include <netinet/ip6.h>
74#endif
75
76#include <security/mac/mac_framework.h>
77
78#ifdef TINY_LOMTU
79#define LOMTU   (1024+512)
80#elif defined(LARGE_LOMTU)
81#define LOMTU   131072
82#else
83#define LOMTU   16384
84#endif
85
86#define LO_CSUM_FEATURES        (CSUM_IP | CSUM_TCP | CSUM_UDP | CSUM_SCTP)
87#define LO_CSUM_FEATURES6       (CSUM_TCP_IPV6 | CSUM_UDP_IPV6 | CSUM_SCTP_IPV6)
88#define LO_CSUM_SET             (CSUM_DATA_VALID | CSUM_DATA_VALID_IPV6 | \
89                                    CSUM_PSEUDO_HDR | \
90                                    CSUM_IP_CHECKED | CSUM_IP_VALID | \
91                                    CSUM_SCTP_VALID)
92
93int             loioctl(struct ifnet *, u_long, caddr_t);
94int             looutput(struct ifnet *ifp, struct mbuf *m,
95                    const struct sockaddr *dst, struct route *ro);
96static int      lo_clone_create(struct if_clone *, int, caddr_t);
97static void     lo_clone_destroy(struct ifnet *);
98
99VNET_DEFINE(struct ifnet *, loif);      /* Used externally */
100
101#ifdef VIMAGE
102static VNET_DEFINE(struct if_clone *, lo_cloner);
103#define V_lo_cloner             VNET(lo_cloner)
104#endif
105
106static struct if_clone *lo_cloner;
107static const char loname[] = "lo";
108
109static void
110lo_clone_destroy(struct ifnet *ifp)
111{
112
113#ifndef VIMAGE
114        /* XXX: destroying lo0 will lead to panics. */
115        KASSERT(V_loif != ifp, ("%s: destroying lo0", __func__));
116#endif
117
118        bpfdetach(ifp);
119        if_detach(ifp);
120        if_free(ifp);
121}
122
123static int
124lo_clone_create(struct if_clone *ifc, int unit, caddr_t params)
125{
126        struct ifnet *ifp;
127
128        ifp = if_alloc(IFT_LOOP);
129        if (ifp == NULL)
130                return (ENOSPC);
131
132        if_initname(ifp, loname, unit);
133        ifp->if_mtu = LOMTU;
134        ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST;
135        ifp->if_ioctl = loioctl;
136        ifp->if_output = looutput;
137        ifp->if_snd.ifq_maxlen = ifqmaxlen;
138        ifp->if_capabilities = ifp->if_capenable =
139            IFCAP_HWCSUM | IFCAP_HWCSUM_IPV6;
140        ifp->if_hwassist = LO_CSUM_FEATURES | LO_CSUM_FEATURES6;
141        if_attach(ifp);
142        bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
143        if (V_loif == NULL)
144                V_loif = ifp;
145
146        return (0);
147}
148
149static void
150vnet_loif_init(const void *unused __unused)
151{
152
153#ifdef VIMAGE
154        lo_cloner = if_clone_simple(loname, lo_clone_create, lo_clone_destroy,
155            1);
156        V_lo_cloner = lo_cloner;
157#else
158        lo_cloner = if_clone_simple(loname, lo_clone_create, lo_clone_destroy,
159            1);
160#endif
161}
162VNET_SYSINIT(vnet_loif_init, SI_SUB_PSEUDO, SI_ORDER_ANY,
163    vnet_loif_init, NULL);
164
165#ifdef VIMAGE
166static void
167vnet_loif_uninit(const void *unused __unused)
168{
169
170        if_clone_detach(V_lo_cloner);
171        V_loif = NULL;
172}
173VNET_SYSUNINIT(vnet_loif_uninit, SI_SUB_INIT_IF, SI_ORDER_SECOND,
174    vnet_loif_uninit, NULL);
175#endif
176
177static int
178loop_modevent(module_t mod, int type, void *data)
179{
180
181        switch (type) {
182        case MOD_LOAD:
183                break;
184
185        case MOD_UNLOAD:
186                printf("loop module unload - not possible for this module type\n");
187                return (EINVAL);
188
189        default:
190                return (EOPNOTSUPP);
191        }
192        return (0);
193}
194
195static moduledata_t loop_mod = {
196        "if_lo",
197        loop_modevent,
198        0
199};
200
201DECLARE_MODULE(if_lo, loop_mod, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY);
202
203int
204looutput(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
205    struct route *ro)
206{
207        u_int32_t af;
208#ifdef MAC
209        int error;
210#endif
211
212        M_ASSERTPKTHDR(m); /* check if we have the packet header */
213
214#ifdef MAC
215        error = mac_ifnet_check_transmit(ifp, m);
216        if (error) {
217                m_freem(m);
218                return (error);
219        }
220#endif
221
222        if (ro != NULL && ro->ro_flags & (RT_REJECT|RT_BLACKHOLE)) {
223                m_freem(m);
224                return (ro->ro_flags & RT_BLACKHOLE ? 0 : EHOSTUNREACH);
225        }
226
227        if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
228        if_inc_counter(ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len);
229
230#ifdef RSS
231        M_HASHTYPE_CLEAR(m);
232#endif
233
234        /* BPF writes need to be handled specially. */
235        if (dst->sa_family == AF_UNSPEC || dst->sa_family == pseudo_AF_HDRCMPLT)
236                bcopy(dst->sa_data, &af, sizeof(af));
237        else
238                af = dst->sa_family;
239
240#if 1   /* XXX */
241        switch (af) {
242        case AF_INET:
243                if (ifp->if_capenable & IFCAP_RXCSUM) {
244                        m->m_pkthdr.csum_data = 0xffff;
245                        m->m_pkthdr.csum_flags = LO_CSUM_SET;
246                }
247                m->m_pkthdr.csum_flags &= ~LO_CSUM_FEATURES;
248                break;
249        case AF_INET6:
250#if 0
251                /*
252                 * XXX-BZ for now always claim the checksum is good despite
253                 * any interface flags.   This is a workaround for 9.1-R and
254                 * a proper solution ought to be sought later.
255                 */
256                if (ifp->if_capenable & IFCAP_RXCSUM_IPV6) {
257                        m->m_pkthdr.csum_data = 0xffff;
258                        m->m_pkthdr.csum_flags = LO_CSUM_SET;
259                }
260#else
261                m->m_pkthdr.csum_data = 0xffff;
262                m->m_pkthdr.csum_flags = LO_CSUM_SET;
263#endif
264                m->m_pkthdr.csum_flags &= ~LO_CSUM_FEATURES6;
265                break;
266        default:
267                printf("looutput: af=%d unexpected\n", af);
268                m_freem(m);
269                return (EAFNOSUPPORT);
270        }
271#endif
272        return (if_simloop(ifp, m, af, 0));
273}
274
275/*
276 * if_simloop()
277 *
278 * This function is to support software emulation of hardware loopback,
279 * i.e., for interfaces with the IFF_SIMPLEX attribute. Since they can't
280 * hear their own broadcasts, we create a copy of the packet that we
281 * would normally receive via a hardware loopback.
282 *
283 * This function expects the packet to include the media header of length hlen.
284 */
285int
286if_simloop(struct ifnet *ifp, struct mbuf *m, int af, int hlen)
287{
288        int isr;
289
290        M_ASSERTPKTHDR(m);
291        m_tag_delete_nonpersistent(m);
292        m->m_pkthdr.rcvif = ifp;
293
294#ifdef MAC
295        mac_ifnet_create_mbuf(ifp, m);
296#endif
297
298        /*
299         * Let BPF see incoming packet in the following manner:
300         *  - Emulated packet loopback for a simplex interface
301         *    (net/if_ethersubr.c)
302         *      -> passes it to ifp's BPF
303         *  - IPv4/v6 multicast packet loopback (netinet(6)/ip(6)_output.c)
304         *      -> not passes it to any BPF
305         *  - Normal packet loopback from myself to myself (net/if_loop.c)
306         *      -> passes to lo0's BPF (even in case of IPv6, where ifp!=lo0)
307         */
308        if (hlen > 0) {
309                if (bpf_peers_present(ifp->if_bpf)) {
310                        bpf_mtap(ifp->if_bpf, m);
311                }
312        } else {
313                if (bpf_peers_present(V_loif->if_bpf)) {
314                        if ((m->m_flags & M_MCAST) == 0 || V_loif == ifp) {
315                                /* XXX beware sizeof(af) != 4 */
316                                u_int32_t af1 = af;
317
318                                /*
319                                 * We need to prepend the address family.
320                                 */
321                                bpf_mtap2(V_loif->if_bpf, &af1, sizeof(af1), m);
322                        }
323                }
324        }
325
326        /* Strip away media header */
327        if (hlen > 0) {
328                m_adj(m, hlen);
329#ifndef __NO_STRICT_ALIGNMENT
330                /*
331                 * Some archs do not like unaligned data, so
332                 * we move data down in the first mbuf.
333                 */
334                if (mtod(m, vm_offset_t) & 3) {
335                        KASSERT(hlen >= 3, ("if_simloop: hlen too small"));
336                        bcopy(m->m_data,
337                            (char *)(mtod(m, vm_offset_t)
338                                - (mtod(m, vm_offset_t) & 3)),
339                            m->m_len);
340                        m->m_data -= (mtod(m,vm_offset_t) & 3);
341                }
342#endif
343        }
344
345        /* Deliver to upper layer protocol */
346        switch (af) {
347#ifdef INET
348        case AF_INET:
349                isr = NETISR_IP;
350                break;
351#endif
352#ifdef INET6
353        case AF_INET6:
354                m->m_flags |= M_LOOP;
355                isr = NETISR_IPV6;
356                break;
357#endif
358        default:
359                printf("if_simloop: can't handle af=%d\n", af);
360                m_freem(m);
361                return (EAFNOSUPPORT);
362        }
363        if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
364        if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
365        netisr_queue(isr, m);   /* mbuf is free'd on failure. */
366        return (0);
367}
368
369/*
370 * Process an ioctl request.
371 */
372/* ARGSUSED */
373int
374loioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
375{
376        struct ifreq *ifr = (struct ifreq *)data;
377        int error = 0, mask;
378
379        switch (cmd) {
380        case SIOCSIFADDR:
381                ifp->if_flags |= IFF_UP;
382                ifp->if_drv_flags |= IFF_DRV_RUNNING;
383                /*
384                 * Everything else is done at a higher level.
385                 */
386                break;
387
388        case SIOCADDMULTI:
389        case SIOCDELMULTI:
390                if (ifr == NULL) {
391                        error = EAFNOSUPPORT;           /* XXX */
392                        break;
393                }
394                switch (ifr->ifr_addr.sa_family) {
395
396#ifdef INET
397                case AF_INET:
398                        break;
399#endif
400#ifdef INET6
401                case AF_INET6:
402                        break;
403#endif
404
405                default:
406                        error = EAFNOSUPPORT;
407                        break;
408                }
409                break;
410
411        case SIOCSIFMTU:
412                ifp->if_mtu = ifr->ifr_mtu;
413                break;
414
415        case SIOCSIFFLAGS:
416                break;
417
418        case SIOCSIFCAP:
419                mask = ifp->if_capenable ^ ifr->ifr_reqcap;
420                if ((mask & IFCAP_RXCSUM) != 0)
421                        ifp->if_capenable ^= IFCAP_RXCSUM;
422                if ((mask & IFCAP_TXCSUM) != 0)
423                        ifp->if_capenable ^= IFCAP_TXCSUM;
424                if ((mask & IFCAP_RXCSUM_IPV6) != 0) {
425#if 0
426                        ifp->if_capenable ^= IFCAP_RXCSUM_IPV6;
427#else
428                        error = EOPNOTSUPP;
429                        break;
430#endif
431                }
432                if ((mask & IFCAP_TXCSUM_IPV6) != 0) {
433#if 0
434                        ifp->if_capenable ^= IFCAP_TXCSUM_IPV6;
435#else
436                        error = EOPNOTSUPP;
437                        break;
438#endif
439                }
440                ifp->if_hwassist = 0;
441                if (ifp->if_capenable & IFCAP_TXCSUM)
442                        ifp->if_hwassist = LO_CSUM_FEATURES;
443#if 0
444                if (ifp->if_capenable & IFCAP_TXCSUM_IPV6)
445                        ifp->if_hwassist |= LO_CSUM_FEATURES6;
446#endif
447                break;
448
449        default:
450                error = EINVAL;
451        }
452        return (error);
453}
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