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1 /*
2 * Copyright (c) 2000-2013 Apple Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28 /*
29 * Copyright (c) 1982, 1986, 1993
30 * The Regents of the University of California. All rights reserved.
31 *
32 * Redistribution and use in source and binary forms, with or without
33 * modification, are permitted provided that the following conditions
34 * are met:
35 * 1. Redistributions of source code must retain the above copyright
36 * notice, this list of conditions and the following disclaimer.
37 * 2. Redistributions in binary form must reproduce the above copyright
38 * notice, this list of conditions and the following disclaimer in the
39 * documentation and/or other materials provided with the distribution.
40 * 3. All advertising materials mentioning features or use of this software
41 * must display the following acknowledgement:
42 * This product includes software developed by the University of
43 * California, Berkeley and its contributors.
44 * 4. Neither the name of the University nor the names of its contributors
45 * may be used to endorse or promote products derived from this software
46 * without specific prior written permission.
47 *
48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58 * SUCH DAMAGE.
59 *
60 * @(#)if_loop.c 8.1 (Berkeley) 6/10/93
61 * $FreeBSD: src/sys/net/if_loop.c,v 1.47.2.5 2001/07/03 11:01:41 ume Exp $
62 */
63 /*
64 * NOTICE: This file was modified by SPARTA, Inc. in 2006 to introduce
65 * support for mandatory and extensible security protections. This notice
66 * is included in support of clause 2.2 (b) of the Apple Public License,
67 * Version 2.0.
68 */
69
70 /*
71 * Loopback interface driver for protocol testing and timing.
72 */
73 #include "loop.h"
74 #if NLOOP > 0
75
76 #if NLOOP != 1
77 #error "More than one loopback interface is not supported."
78 #endif
79
80 #include <sys/param.h>
81 #include <sys/systm.h>
82 #include <sys/kernel.h>
83 #include <sys/mbuf.h>
84 #include <sys/socket.h>
85 #include <sys/sockio.h>
86 #include <sys/mcache.h>
87 #include <sys/sysctl.h>
88
89 #include <net/if.h>
90 #include <net/if_types.h>
91 #include <net/route.h>
92 #include <net/bpf.h>
93 #include <sys/malloc.h>
94
95 #if INET
96 #include <netinet/in.h>
97 #include <netinet/in_var.h>
98 #endif
99
100 #if INET6
101 #if !INET
102 #include <netinet/in.h>
103 #endif
104 #include <netinet6/in6_var.h>
105 #include <netinet/ip6.h>
106 #endif
107
108 #include <net/dlil.h>
109 #include <net/kpi_protocol.h>
110
111 #if CONFIG_MACF_NET
112 #include <security/mac_framework.h>
113 #endif
114
115 #include <pexpert/pexpert.h>
116
117 #define LOMTU 16384
118 #define LOSNDQ_MAXLEN 256
119
120 #define LO_BPF_TAP_OUT(_m) { \
121 if (lo_statics[0].bpf_callback != NULL) { \
122 bpf_tap_out(lo_ifp, DLT_NULL, _m, \
123 &((struct loopback_header *)_m->m_pkthdr.pkt_hdr)-> \
124 protocol, sizeof (u_int32_t)); \
125 } \
126 }
127
128 #define LO_BPF_TAP_OUT_MULTI(_m) { \
129 if (lo_statics[0].bpf_callback != NULL) { \
130 struct mbuf *_n; \
131 for (_n = _m; _n != NULL; _n = _n->m_nextpkt) \
132 LO_BPF_TAP_OUT(_n); \
133 } \
134 }
135
136 struct lo_statics_str {
137 int bpf_mode;
138 bpf_packet_func bpf_callback;
139 };
140
141 static struct lo_statics_str lo_statics[NLOOP];
142 static int lo_txstart = 0;
143
144 struct ifnet *lo_ifp = NULL;
145
146 struct loopback_header {
147 protocol_family_t protocol;
148 };
149
150 /* Local forward declerations */
151 void loopattach(void);
152 static errno_t lo_demux(struct ifnet *, struct mbuf *, char *,
153 protocol_family_t *);
154 static errno_t
155 lo_framer(struct ifnet *, struct mbuf **, const struct sockaddr *,
156 const char *, const char *, u_int32_t *, u_int32_t *);
157 static errno_t lo_add_proto(struct ifnet *, protocol_family_t,
158 const struct ifnet_demux_desc *, u_int32_t);
159 static errno_t lo_del_proto(struct ifnet *, protocol_family_t);
160 static int lo_output(struct ifnet *, struct mbuf *);
161 static errno_t lo_pre_enqueue(struct ifnet *, struct mbuf *);
162 static void lo_start(struct ifnet *);
163 static errno_t lo_pre_output(struct ifnet *, protocol_family_t, struct mbuf **,
164 const struct sockaddr *, void *, char *, char *);
165 static errno_t lo_input(struct ifnet *, protocol_family_t, struct mbuf *);
166 static void lo_rtrequest(int, struct rtentry *, struct sockaddr *);
167 static errno_t lo_ioctl(struct ifnet *, u_long, void *);
168 static errno_t lo_attach_proto(struct ifnet *, protocol_family_t);
169 static void lo_reg_if_mods(void);
170 static errno_t lo_set_bpf_tap(struct ifnet *, bpf_tap_mode, bpf_packet_func);
171 static int sysctl_dequeue_max SYSCTL_HANDLER_ARGS;
172 static int sysctl_sched_model SYSCTL_HANDLER_ARGS;
173 static int sysctl_dequeue_scidx SYSCTL_HANDLER_ARGS;
174
175 SYSCTL_DECL(_net_link);
176
177 SYSCTL_NODE(_net_link, OID_AUTO, loopback, CTLFLAG_RW | CTLFLAG_LOCKED, 0,
178 "loopback interface");
179
180 static u_int32_t lo_dequeue_max = LOSNDQ_MAXLEN;
181 SYSCTL_PROC(_net_link_loopback, OID_AUTO, max_dequeue,
182 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED, &lo_dequeue_max, LOSNDQ_MAXLEN,
183 sysctl_dequeue_max, "I", "Maximum number of packets dequeued at a time");
184
185 static u_int32_t lo_sched_model = IFNET_SCHED_MODEL_NORMAL;
186 SYSCTL_PROC(_net_link_loopback, OID_AUTO, sched_model,
187 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED, &lo_sched_model,
188 IFNET_SCHED_MODEL_NORMAL, sysctl_sched_model, "I", "Scheduling model");
189
190 static u_int32_t lo_dequeue_sc = MBUF_SC_BE;
191 static int lo_dequeue_scidx = MBUF_SCIDX(MBUF_SC_BE);
192 SYSCTL_PROC(_net_link_loopback, OID_AUTO, dequeue_sc,
193 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED, &lo_dequeue_scidx,
194 MBUF_SC_BE, sysctl_dequeue_scidx, "I", "Dequeue a specific SC index");
195
196 static errno_t
197 lo_demux(struct ifnet *ifp, struct mbuf *m, char *frame_header,
198 protocol_family_t *protocol_family)
199 {
200 #pragma unused(ifp, m)
201 struct loopback_header *header =
202 (struct loopback_header *)(void *)frame_header;
203
204 *protocol_family = header->protocol;
205
206 return (0);
207 }
208
209 static errno_t
210 lo_framer(struct ifnet *ifp, struct mbuf **m, const struct sockaddr *dest,
211 const char *dest_linkaddr, const char *frame_type,
212 u_int32_t *prepend_len, u_int32_t *postpend_len)
213 {
214 #pragma unused(ifp, dest, dest_linkaddr)
215 struct loopback_header *header;
216
217 M_PREPEND(*m, sizeof (struct loopback_header), M_WAITOK, 1);
218 if (*m == NULL) {
219 /* Tell caller not to try to free passed-in mbuf */
220 return (EJUSTRETURN);
221 }
222
223 if (prepend_len != NULL)
224 *prepend_len = sizeof (struct loopback_header);
225 if (postpend_len != NULL)
226 *postpend_len = 0;
227
228 header = mtod(*m, struct loopback_header *);
229 bcopy(frame_type, &header->protocol, sizeof (u_int32_t));
230 return (0);
231 }
232
233 static errno_t
234 lo_add_proto(struct ifnet *interface, protocol_family_t protocol_family,
235 const struct ifnet_demux_desc *demux_array, u_int32_t demux_count)
236 {
237 #pragma unused(interface, protocol_family, demux_array, demux_count)
238 return (0);
239 }
240
241 static errno_t
242 lo_del_proto(struct ifnet *ifp, protocol_family_t protocol)
243 {
244 #pragma unused(ifp, protocol)
245 return (0);
246 }
247
248 static void
249 lo_tx_compl(struct ifnet *ifp, struct mbuf *m)
250 {
251 errno_t error;
252
253 if ((ifp->if_xflags & IFXF_TIMESTAMP_ENABLED) != 0) {
254 boolean_t requested;
255
256 error = mbuf_get_timestamp_requested(m, &requested);
257 if (requested) {
258 struct timespec now;
259 u_int64_t ts;
260
261 nanouptime(&now);
262 net_timernsec(&now, &ts);
263
264 error = mbuf_set_timestamp(m, ts, TRUE);
265 if (error != 0)
266 printf("%s: mbuf_set_timestamp() failed %d\n",
267 __func__, error);
268 }
269 }
270 error = mbuf_set_status(m, KERN_SUCCESS);
271 if (error != 0)
272 printf("%s: mbuf_set_status() failed %d\n",
273 __func__, error);
274
275 ifnet_tx_compl(ifp, m);
276 }
277
278 /*
279 * Output callback.
280 *
281 * This routine is called only when lo_txstart is disabled.
282 */
283 static int
284 lo_output(struct ifnet *ifp, struct mbuf *m_list)
285 {
286 struct mbuf *m, *m_tail = NULL;
287 struct ifnet_stat_increment_param s;
288 u_int32_t cnt = 0, len = 0;
289
290 bzero(&s, sizeof(s));
291
292 for (m = m_list; m; m = m->m_nextpkt) {
293 VERIFY(m->m_flags & M_PKTHDR);
294 cnt++;
295 len += m->m_pkthdr.len;
296
297 /*
298 * Don't overwrite the rcvif field if it is in use.
299 * This is used to match multicast packets, sent looping
300 * back, with the appropriate group record on input.
301 */
302 if (m->m_pkthdr.rcvif == NULL)
303 m->m_pkthdr.rcvif = ifp;
304
305 m->m_pkthdr.pkt_flags |= PKTF_LOOP;
306 m->m_pkthdr.pkt_hdr = mtod(m, char *);
307
308 /* loopback checksums are always OK */
309 m->m_pkthdr.csum_data = 0xffff;
310 m->m_pkthdr.csum_flags =
311 CSUM_DATA_VALID | CSUM_PSEUDO_HDR |
312 CSUM_IP_CHECKED | CSUM_IP_VALID;
313
314 m_adj(m, sizeof (struct loopback_header));
315
316 LO_BPF_TAP_OUT(m);
317 if (m->m_nextpkt == NULL) {
318 m_tail = m;
319 }
320 lo_tx_compl(ifp, m);
321 }
322
323 s.packets_in = cnt;
324 s.packets_out = cnt;
325 s.bytes_in = len;
326 s.bytes_out = len;
327
328 return (ifnet_input_extended(ifp, m_list, m_tail, &s));
329 }
330
331 /*
332 * Pre-enqueue callback.
333 *
334 * This routine is called only when lo_txstart is enabled.
335 */
336 static errno_t
337 lo_pre_enqueue(struct ifnet *ifp, struct mbuf *m0)
338 {
339 struct mbuf *m = m0, *n;
340 int error = 0;
341
342 while (m != NULL) {
343 VERIFY(m->m_flags & M_PKTHDR);
344
345 n = m->m_nextpkt;
346 m->m_nextpkt = NULL;
347
348 /*
349 * Don't overwrite the rcvif field if it is in use.
350 * This is used to match multicast packets, sent looping
351 * back, with the appropriate group record on input.
352 */
353 if (m->m_pkthdr.rcvif == NULL)
354 m->m_pkthdr.rcvif = ifp;
355
356 m->m_pkthdr.pkt_flags |= PKTF_LOOP;
357 m->m_pkthdr.pkt_hdr = mtod(m, char *);
358
359 /* loopback checksums are always OK */
360 m->m_pkthdr.csum_data = 0xffff;
361 m->m_pkthdr.csum_flags =
362 CSUM_DATA_VALID | CSUM_PSEUDO_HDR |
363 CSUM_IP_CHECKED | CSUM_IP_VALID;
364
365 m_adj(m, sizeof (struct loopback_header));
366
367 /*
368 * Let the callee free it in case of error,
369 * and perform any necessary accounting.
370 */
371 (void) ifnet_enqueue(ifp, m);
372
373 m = n;
374 }
375
376 return (error);
377 }
378
379 /*
380 * Start output callback.
381 *
382 * This routine is invoked by the start worker thread; because we never call
383 * it directly, there is no need do deploy any serialization mechanism other
384 * than what's already used by the worker thread, i.e. this is already single
385 * threaded.
386 *
387 * This routine is called only when lo_txstart is enabled.
388 */
389 static void
390 lo_start(struct ifnet *ifp)
391 {
392 struct ifnet_stat_increment_param s;
393
394 bzero(&s, sizeof (s));
395
396 for (;;) {
397 struct mbuf *m = NULL, *m_tail = NULL;
398 u_int32_t cnt, len = 0;
399
400 if (lo_sched_model == IFNET_SCHED_MODEL_NORMAL) {
401 if (ifnet_dequeue_multi(ifp, lo_dequeue_max, &m,
402 &m_tail, &cnt, &len) != 0)
403 break;
404 } else {
405 if (ifnet_dequeue_service_class_multi(ifp,
406 lo_dequeue_sc, lo_dequeue_max, &m,
407 &m_tail, &cnt, &len) != 0)
408 break;
409 }
410
411 LO_BPF_TAP_OUT_MULTI(m);
412 lo_tx_compl(ifp, m);
413
414 /* stats are required for extended variant */
415 s.packets_in = cnt;
416 s.packets_out = cnt;
417 s.bytes_in = len;
418 s.bytes_out = len;
419
420 (void) ifnet_input_extended(ifp, m, m_tail, &s);
421 }
422 }
423
424 /*
425 * This is a common pre-output route used by INET and INET6. This could
426 * (should?) be split into separate pre-output routines for each protocol.
427 */
428 static errno_t
429 lo_pre_output(struct ifnet *ifp, protocol_family_t protocol_family,
430 struct mbuf **m, const struct sockaddr *dst, void *route, char *frame_type,
431 char *dst_addr)
432 {
433 #pragma unused(ifp, dst, dst_addr)
434 struct rtentry *rt = route;
435
436 VERIFY((*m)->m_flags & M_PKTHDR);
437
438 (*m)->m_flags |= M_LOOP;
439
440 if (rt != NULL) {
441 u_int32_t rt_flags = rt->rt_flags;
442 if (rt_flags & (RTF_REJECT | RTF_BLACKHOLE)) {
443 if (rt_flags & RTF_BLACKHOLE) {
444 m_freem(*m);
445 return (EJUSTRETURN);
446 } else {
447 return ((rt_flags & RTF_HOST) ?
448 EHOSTUNREACH : ENETUNREACH);
449 }
450 }
451 }
452
453 bcopy(&protocol_family, frame_type, sizeof (protocol_family));
454
455 return (0);
456 }
457
458 /*
459 * lo_input - This should work for all attached protocols that use the
460 * ifq/schednetisr input mechanism.
461 */
462 static errno_t
463 lo_input(struct ifnet *ifp, protocol_family_t protocol_family, struct mbuf *m)
464 {
465 #pragma unused(ifp, protocol_family)
466
467 if ((ifp->if_xflags & IFXF_TIMESTAMP_ENABLED) != 0) {
468 errno_t error;
469 struct timespec now;
470 u_int64_t ts;
471
472 nanouptime(&now);
473 net_timernsec(&now, &ts);
474
475 error = mbuf_set_timestamp(m, ts, TRUE);
476 if (error != 0)
477 printf("%s: mbuf_set_timestamp() failed %d\n",
478 __func__, error);
479 }
480
481 if (proto_input(protocol_family, m) != 0)
482 m_freem(m);
483 return (0);
484 }
485
486 /* ARGSUSED */
487 static void
488 lo_rtrequest(int cmd, struct rtentry *rt, struct sockaddr *sa)
489 {
490 #pragma unused(cmd, sa)
491 if (rt != NULL) {
492 RT_LOCK_ASSERT_HELD(rt);
493 rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu; /* for ISO */
494 /*
495 * For optimal performance, the send and receive buffers
496 * should be at least twice the MTU plus a little more for
497 * overhead.
498 */
499 rt->rt_rmx.rmx_recvpipe = rt->rt_rmx.rmx_sendpipe = 3 * LOMTU;
500 }
501 }
502
503 /*
504 * Process an ioctl request.
505 */
506 static errno_t
507 lo_ioctl(struct ifnet *ifp, u_long cmd, void *data)
508 {
509 int error = 0;
510
511 switch (cmd) {
512
513 case SIOCSIFADDR: { /* struct ifaddr pointer */
514 struct ifaddr *ifa = data;
515
516 ifnet_set_flags(ifp, IFF_UP|IFF_RUNNING, IFF_UP|IFF_RUNNING);
517 IFA_LOCK_SPIN(ifa);
518 ifa->ifa_rtrequest = lo_rtrequest;
519 IFA_UNLOCK(ifa);
520 /*
521 * Everything else is done at a higher level.
522 */
523 break;
524 }
525
526 case SIOCADDMULTI: /* struct ifreq */
527 case SIOCDELMULTI: { /* struct ifreq */
528 struct ifreq *ifr = data;
529
530 if (ifr == NULL) {
531 error = EAFNOSUPPORT; /* XXX */
532 break;
533 }
534 switch (ifr->ifr_addr.sa_family) {
535
536 #if INET
537 case AF_INET:
538 break;
539 #endif
540 #if INET6
541 case AF_INET6:
542 break;
543 #endif
544
545 default:
546 error = EAFNOSUPPORT;
547 break;
548 }
549 break;
550 }
551
552 case SIOCSIFMTU: { /* struct ifreq */
553 struct ifreq *ifr = data;
554
555 bcopy(&ifr->ifr_mtu, &ifp->if_mtu, sizeof (int));
556 break;
557 }
558
559 case SIOCSIFFLAGS: /* struct ifreq */
560 case SIOCSIFTIMESTAMPENABLE:
561 case SIOCSIFTIMESTAMPDISABLE:
562 break;
563
564 default:
565 error = EOPNOTSUPP;
566 break;
567 }
568 return (error);
569 }
570 #endif /* NLOOP > 0 */
571
572
573 static errno_t
574 lo_attach_proto(struct ifnet *ifp, protocol_family_t protocol_family)
575 {
576 struct ifnet_attach_proto_param_v2 proto;
577 errno_t result = 0;
578
579 bzero(&proto, sizeof (proto));
580 proto.input = lo_input;
581 proto.pre_output = lo_pre_output;
582
583 result = ifnet_attach_protocol_v2(ifp, protocol_family, &proto);
584
585 if (result && result != EEXIST) {
586 printf("lo_attach_proto: ifnet_attach_protocol for %u "
587 "returned=%d\n", protocol_family, result);
588 }
589
590 return (result);
591 }
592
593 static void
594 lo_reg_if_mods(void)
595 {
596 int error;
597
598 /* Register protocol registration functions */
599 if ((error = proto_register_plumber(PF_INET,
600 APPLE_IF_FAM_LOOPBACK, lo_attach_proto, NULL)) != 0)
601 printf("proto_register_plumber failed for AF_INET "
602 "error=%d\n", error);
603
604 if ((error = proto_register_plumber(PF_INET6,
605 APPLE_IF_FAM_LOOPBACK, lo_attach_proto, NULL)) != 0)
606 printf("proto_register_plumber failed for AF_INET6 "
607 "error=%d\n", error);
608 }
609
610 static errno_t
611 lo_set_bpf_tap(struct ifnet *ifp, bpf_tap_mode mode,
612 bpf_packet_func bpf_callback)
613 {
614 VERIFY(ifp == lo_ifp);
615
616 lo_statics[0].bpf_mode = mode;
617
618 switch (mode) {
619 case BPF_TAP_DISABLE:
620 case BPF_TAP_INPUT:
621 lo_statics[0].bpf_callback = NULL;
622 break;
623
624 case BPF_TAP_OUTPUT:
625 case BPF_TAP_INPUT_OUTPUT:
626 lo_statics[0].bpf_callback = bpf_callback;
627 break;
628 }
629
630 return (0);
631 }
632
633 /* ARGSUSED */
634 void
635 loopattach(void)
636 {
637 struct ifnet_init_eparams lo_init;
638 errno_t result = 0;
639
640 PE_parse_boot_argn("lo_txstart", &lo_txstart, sizeof (lo_txstart));
641
642 lo_reg_if_mods();
643
644 lo_statics[0].bpf_callback = NULL;
645 lo_statics[0].bpf_mode = BPF_TAP_DISABLE;
646
647 bzero(&lo_init, sizeof (lo_init));
648 lo_init.ver = IFNET_INIT_CURRENT_VERSION;
649 lo_init.len = sizeof (lo_init);
650 lo_init.sndq_maxlen = LOSNDQ_MAXLEN;
651 if (lo_txstart) {
652 lo_init.flags = 0;
653 lo_init.pre_enqueue = lo_pre_enqueue;
654 lo_init.start = lo_start;
655 lo_init.output_sched_model = lo_sched_model;
656 } else {
657 lo_init.flags = IFNET_INIT_LEGACY;
658 lo_init.output = lo_output;
659 }
660 lo_init.flags |= IFNET_INIT_NX_NOAUTO;
661 lo_init.name = "lo";
662 lo_init.unit = 0;
663 lo_init.family = IFNET_FAMILY_LOOPBACK;
664 lo_init.type = IFT_LOOP;
665 lo_init.demux = lo_demux;
666 lo_init.add_proto = lo_add_proto;
667 lo_init.del_proto = lo_del_proto;
668 lo_init.framer_extended = lo_framer;
669 lo_init.softc = &lo_statics[0];
670 lo_init.ioctl = lo_ioctl;
671 lo_init.set_bpf_tap = lo_set_bpf_tap;
672
673 result = ifnet_allocate_extended(&lo_init, &lo_ifp);
674 if (result != 0) {
675 panic("%s: couldn't allocate loopback ifnet (%d)\n",
676 __func__, result);
677 /* NOTREACHED */
678 }
679
680 ifnet_set_mtu(lo_ifp, LOMTU);
681 ifnet_set_flags(lo_ifp, IFF_LOOPBACK | IFF_MULTICAST,
682 IFF_LOOPBACK | IFF_MULTICAST);
683 ifnet_set_offload(lo_ifp,
684 IFNET_CSUM_IP | IFNET_CSUM_TCP | IFNET_CSUM_UDP |
685 IFNET_CSUM_TCPIPV6 | IFNET_CSUM_UDPIPV6 | IFNET_IPV6_FRAGMENT |
686 IFNET_CSUM_FRAGMENT | IFNET_IP_FRAGMENT | IFNET_MULTIPAGES |
687 IFNET_TX_STATUS | IFNET_SW_TIMESTAMP);
688 ifnet_set_hdrlen(lo_ifp, sizeof (struct loopback_header));
689 ifnet_set_eflags(lo_ifp, IFEF_SENDLIST, IFEF_SENDLIST);
690
691 #if CONFIG_MACF_NET
692 mac_ifnet_label_init(ifp);
693 #endif
694
695 result = ifnet_attach(lo_ifp, NULL);
696 if (result != 0) {
697 panic("%s: couldn't attach loopback ifnet (%d)\n",
698 __func__, result);
699 /* NOTREACHED */
700 }
701 /*
702 * Disable ECN on loopback as ECN serves no purpose and otherwise
703 * TCP connections are subject to heuristics like SYN retransmits on RST
704 */
705 lo_ifp->if_eflags &= ~IFEF_ECN_ENABLE;
706 lo_ifp->if_eflags |= IFEF_ECN_DISABLE;
707
708 bpfattach(lo_ifp, DLT_NULL, sizeof (u_int32_t));
709 }
710
711 static int
712 sysctl_dequeue_max SYSCTL_HANDLER_ARGS
713 {
714 #pragma unused(arg1, arg2)
715 u_int32_t i;
716 int err;
717
718 i = lo_dequeue_max;
719
720 err = sysctl_handle_int(oidp, &i, 0, req);
721 if (err != 0 || req->newptr == USER_ADDR_NULL)
722 return (err);
723
724 if (i < 1)
725 i = 1;
726 else if (i > LOSNDQ_MAXLEN)
727 i = LOSNDQ_MAXLEN;
728
729 lo_dequeue_max = i;
730
731 return (err);
732 }
733
734 static int
735 sysctl_sched_model SYSCTL_HANDLER_ARGS
736 {
737 #pragma unused(arg1, arg2)
738 u_int32_t i;
739 int err;
740
741 i = lo_sched_model;
742
743 err = sysctl_handle_int(oidp, &i, 0, req);
744 if (err != 0 || req->newptr == USER_ADDR_NULL)
745 return (err);
746
747 switch (i) {
748 case IFNET_SCHED_MODEL_NORMAL:
749 case IFNET_SCHED_MODEL_DRIVER_MANAGED:
750 case IFNET_SCHED_MODEL_FQ_CODEL:
751 break;
752
753 default:
754 err = EINVAL;
755 break;
756 }
757
758 if (err == 0 && (err = ifnet_set_output_sched_model(lo_ifp, i)) == 0)
759 lo_sched_model = i;
760
761 return (err);
762 }
763
764 static int
765 sysctl_dequeue_scidx SYSCTL_HANDLER_ARGS
766 {
767 #pragma unused(arg1, arg2)
768 u_int32_t i;
769 int err;
770
771 i = lo_dequeue_scidx;
772
773 err = sysctl_handle_int(oidp, &i, 0, req);
774 if (err != 0 || req->newptr == USER_ADDR_NULL)
775 return (err);
776
777 if (!MBUF_VALID_SCIDX(i))
778 return (EINVAL);
779
780 if (lo_sched_model != IFNET_SCHED_MODEL_DRIVER_MANAGED)
781 return (ENODEV);
782
783 lo_dequeue_sc = m_service_class_from_idx(i);
784 lo_dequeue_scidx = MBUF_SCIDX(lo_dequeue_sc);
785
786 return (err);
787 }