1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 * Copyright 2012, Nexenta Systems, Inc. All rights reserved.
25 */
26
27 /*
28 * Copyright 2019 Joyent, Inc.
29 */
30
31 /*
32 * Data-Link Services Module
33 */
34
35 #include <sys/strsun.h>
36 #include <sys/vlan.h>
37 #include <sys/dld_impl.h>
38 #include <sys/mac_client_priv.h>
39
40 int
dls_open(dls_link_t * dlp,dls_dl_handle_t ddh,dld_str_t * dsp)41 dls_open(dls_link_t *dlp, dls_dl_handle_t ddh, dld_str_t *dsp)
42 {
43 zoneid_t zid = getzoneid();
44 boolean_t local;
45 int err;
46
47 /*
48 * Check whether this client belongs to the zone of this dlp. Note that
49 * a global zone client is allowed to open a local zone dlp.
50 */
51 if (zid != GLOBAL_ZONEID && dlp->dl_zid != zid)
52 return (ENOENT);
53
54 /*
55 * mac_start() is required for non-legacy MACs to show accurate
56 * kstats even before the interface is brought up. For legacy
57 * drivers, this is not needed. Further, calling mac_start() for
58 * legacy drivers would make the shared-lower-stream to stay in
59 * the DL_IDLE state, which in turn causes performance regression.
60 */
61 if (!mac_capab_get(dlp->dl_mh, MAC_CAPAB_LEGACY, NULL) &&
62 ((err = mac_start(dlp->dl_mh)) != 0)) {
63 return (err);
64 }
65
66 local = (zid == dlp->dl_zid);
67 dlp->dl_zone_ref += (local ? 1 : 0);
68
69 /*
70 * Cache a copy of the MAC interface handle, a pointer to the
71 * immutable MAC info.
72 */
73 dsp->ds_dlp = dlp;
74 dsp->ds_mh = dlp->dl_mh;
75 dsp->ds_mch = dlp->dl_mch;
76 dsp->ds_mip = dlp->dl_mip;
77 dsp->ds_ddh = ddh;
78 dsp->ds_local = local;
79
80 ASSERT(MAC_PERIM_HELD(dsp->ds_mh));
81 return (0);
82 }
83
84 void
dls_close(dld_str_t * dsp)85 dls_close(dld_str_t *dsp)
86 {
87 dls_link_t *dlp = dsp->ds_dlp;
88 dls_multicst_addr_t *p;
89 dls_multicst_addr_t *nextp;
90
91 ASSERT(dsp->ds_datathr_cnt == 0);
92 ASSERT(MAC_PERIM_HELD(dsp->ds_mh));
93
94 if (dsp->ds_local)
95 dlp->dl_zone_ref--;
96 dsp->ds_local = B_FALSE;
97
98 /*
99 * Walk the list of multicast addresses, disabling each at the MAC.
100 * Note that we must remove multicast address before
101 * mac_unicast_remove() (called by dls_active_clear()) because
102 * mac_multicast_remove() relies on the unicast flows on the mac
103 * client.
104 */
105 for (p = dsp->ds_dmap; p != NULL; p = nextp) {
106 (void) mac_multicast_remove(dsp->ds_mch, p->dma_addr);
107 nextp = p->dma_nextp;
108 kmem_free(p, sizeof (dls_multicst_addr_t));
109 }
110 dsp->ds_dmap = NULL;
111
112 dls_active_clear(dsp, B_TRUE);
113
114 /*
115 * If the dld_str_t is bound then unbind it.
116 */
117 if (dsp->ds_dlstate == DL_IDLE) {
118 dls_unbind(dsp);
119 dsp->ds_dlstate = DL_UNBOUND;
120 }
121
122 /*
123 * If the MAC has been set in promiscuous mode then disable it.
124 * This needs to be done before resetting ds_rx.
125 */
126 (void) dls_promisc(dsp, 0);
127
128 /*
129 * At this point we have cutoff inbound packet flow from the mac
130 * for this 'dsp'. The dls_link_remove above cut off packets meant
131 * for us and waited for upcalls to finish. Similarly the dls_promisc
132 * reset above waited for promisc callbacks to finish. Now we can
133 * safely reset ds_rx to NULL
134 */
135 dsp->ds_rx = NULL;
136 dsp->ds_rx_arg = NULL;
137
138 dsp->ds_dlp = NULL;
139
140 if (!mac_capab_get(dsp->ds_mh, MAC_CAPAB_LEGACY, NULL))
141 mac_stop(dsp->ds_mh);
142
143 /*
144 * Release our reference to the dls_link_t allowing that to be
145 * destroyed if there are no more dls_impl_t.
146 */
147 dls_link_rele(dlp);
148 }
149
150 int
dls_bind(dld_str_t * dsp,uint32_t sap)151 dls_bind(dld_str_t *dsp, uint32_t sap)
152 {
153 uint32_t dls_sap;
154
155 ASSERT(MAC_PERIM_HELD(dsp->ds_mh));
156
157 /*
158 * Check to see the value is legal for the media type.
159 */
160 if (!mac_sap_verify(dsp->ds_mh, sap, &dls_sap))
161 return (EINVAL);
162
163 if (dsp->ds_promisc & DLS_PROMISC_SAP)
164 dls_sap = DLS_SAP_PROMISC;
165
166 /*
167 * Set up the dld_str_t to mark it as able to receive packets.
168 */
169 dsp->ds_sap = sap;
170
171 /*
172 * The MAC layer does the VLAN demultiplexing and will only pass up
173 * untagged packets to non-promiscuous primary MAC clients. In order to
174 * support binding to the VLAN SAP, which is required by DLPI, DLS
175 * needs to get a copy of all tagged packets when the client binds to
176 * the VLAN SAP. We do this by registering a separate promiscuous
177 * callback for each DLS client binding to that SAP.
178 *
179 * Note: even though there are two promiscuous handles in dld_str_t,
180 * ds_mph is for the regular promiscuous mode, ds_vlan_mph is the handle
181 * to receive VLAN traffic when promiscuous mode is not on. Only one of
182 * them can be non-NULL at the same time, to avoid receiving duplicate
183 * copies of packets.
184 */
185 if (sap == ETHERTYPE_VLAN && dsp->ds_promisc == 0) {
186 int err;
187
188 if (dsp->ds_vlan_mph != NULL)
189 return (EINVAL);
190 err = mac_promisc_add(dsp->ds_mch,
191 MAC_CLIENT_PROMISC_ALL, dls_rx_vlan_promisc, dsp,
192 &dsp->ds_vlan_mph, MAC_PROMISC_FLAGS_NO_PHYS);
193
194 if (err == 0 && dsp->ds_nonip &&
195 dsp->ds_dlp->dl_nonip_cnt++ == 0)
196 mac_rx_bypass_disable(dsp->ds_mch);
197
198 return (err);
199 }
200
201 /*
202 * Now bind the dld_str_t by adding it into the hash table in the
203 * dls_link_t.
204 */
205 dls_link_add(dsp->ds_dlp, dls_sap, dsp);
206 if (dsp->ds_nonip && dsp->ds_dlp->dl_nonip_cnt++ == 0)
207 mac_rx_bypass_disable(dsp->ds_mch);
208
209 return (0);
210 }
211
212 void
dls_unbind(dld_str_t * dsp)213 dls_unbind(dld_str_t *dsp)
214 {
215 ASSERT(MAC_PERIM_HELD(dsp->ds_mh));
216
217 if (dsp->ds_nonip && --dsp->ds_dlp->dl_nonip_cnt == 0)
218 mac_rx_bypass_enable(dsp->ds_mch);
219
220 /*
221 * A VLAN SAP does not actually add itself to the STREAM head today.
222 * While we initially set up a VLAN handle below, it's possible that
223 * something else will have come in and clobbered it.
224 */
225 if (dsp->ds_sap == ETHERTYPE_VLAN) {
226 if (dsp->ds_vlan_mph != NULL) {
227 mac_promisc_remove(dsp->ds_vlan_mph);
228 dsp->ds_vlan_mph = NULL;
229 }
230 return;
231 }
232
233 /*
234 * Unbind the dld_str_t by removing it from the hash table in the
235 * dls_link_t.
236 */
237 dls_link_remove(dsp->ds_dlp, dsp);
238 dsp->ds_sap = 0;
239 }
240
241 /*
242 * In order to prevent promiscuous-mode processing with dsp->ds_promisc
243 * set to inaccurate values, this function sets dsp->ds_promisc with new
244 * flags. For enabling (mac_promisc_add), the flags are set prior to the
245 * actual enabling. For disabling (mac_promisc_remove), the flags are set
246 * after the actual disabling.
247 */
248 int
dls_promisc(dld_str_t * dsp,uint32_t new_flags)249 dls_promisc(dld_str_t *dsp, uint32_t new_flags)
250 {
251 int err = 0;
252 uint32_t old_flags = dsp->ds_promisc;
253 const uint32_t option_flags = DLS_PROMISC_RX_ONLY;
254 uint32_t old_type = old_flags & ~option_flags;
255 uint32_t new_type = new_flags & ~option_flags;
256 mac_client_promisc_type_t mptype = MAC_CLIENT_PROMISC_ALL;
257 uint16_t mac_flags = 0;
258
259 ASSERT(MAC_PERIM_HELD(dsp->ds_mh));
260 ASSERT(!(new_flags & ~(DLS_PROMISC_SAP | DLS_PROMISC_MULTI |
261 DLS_PROMISC_PHYS | option_flags)));
262
263 /*
264 * If the user has only requested DLS_PROMISC_MULTI then we need to make
265 * sure that they don't see all packets.
266 */
267 if (new_type == DLS_PROMISC_MULTI)
268 mptype = MAC_CLIENT_PROMISC_MULTI;
269
270 /*
271 * Look at new flags and figure out the correct mac promisc flags.
272 * If we've only requested DLS_PROMISC_SAP and not _MULTI or _PHYS,
273 * don't turn on physical promisc mode.
274 */
275 if (new_flags & DLS_PROMISC_RX_ONLY)
276 mac_flags |= MAC_PROMISC_FLAGS_NO_TX_LOOP;
277 if (new_type == DLS_PROMISC_SAP)
278 mac_flags |= MAC_PROMISC_FLAGS_NO_PHYS;
279
280 /*
281 * There are three cases we care about here with respect to MAC. Going
282 * from nothing to something, something to nothing, something to
283 * something where we need to change how we're getting stuff from mac.
284 * In the last case, as long as they're not equal, we need to assume
285 * something has changed and do something about it.
286 */
287 if (old_type == 0 && new_type == 0) {
288 /*
289 * If there are only option flags in the old and new flags
290 * then there is no need to talk to MAC. Just update the flags.
291 */
292 dsp->ds_promisc = new_flags;
293 } else if (old_type == 0 && new_type != 0) {
294 dsp->ds_promisc = new_flags;
295 err = mac_promisc_add(dsp->ds_mch, mptype,
296 dls_rx_promisc, dsp, &dsp->ds_mph, mac_flags);
297 if (err != 0) {
298 dsp->ds_promisc = old_flags;
299 return (err);
300 }
301
302 /* Remove vlan promisc handle to avoid sending dup copy up */
303 if (dsp->ds_vlan_mph != NULL) {
304 mac_promisc_remove(dsp->ds_vlan_mph);
305 dsp->ds_vlan_mph = NULL;
306 }
307 } else if (old_type != 0 && new_type == 0) {
308 ASSERT(dsp->ds_mph != NULL);
309
310 mac_promisc_remove(dsp->ds_mph);
311 dsp->ds_promisc = new_flags;
312 dsp->ds_mph = NULL;
313
314 if (dsp->ds_sap == ETHERTYPE_VLAN &&
315 dsp->ds_dlstate != DL_UNBOUND) {
316 if (dsp->ds_vlan_mph != NULL)
317 return (EINVAL);
318 err = mac_promisc_add(dsp->ds_mch,
319 MAC_CLIENT_PROMISC_ALL, dls_rx_vlan_promisc, dsp,
320 &dsp->ds_vlan_mph, MAC_PROMISC_FLAGS_NO_PHYS);
321 }
322 } else if (new_flags != old_flags) {
323 ASSERT(dsp->ds_mph != NULL);
324 mac_promisc_remove(dsp->ds_mph);
325 /* Honors both after-remove and before-add semantics! */
326 dsp->ds_promisc = new_flags;
327 err = mac_promisc_add(dsp->ds_mch, mptype,
328 dls_rx_promisc, dsp, &dsp->ds_mph, mac_flags);
329 if (err != 0)
330 dsp->ds_promisc = old_flags;
331 }
332
333 return (err);
334 }
335
336 int
dls_multicst_add(dld_str_t * dsp,const uint8_t * addr)337 dls_multicst_add(dld_str_t *dsp, const uint8_t *addr)
338 {
339 int err;
340 dls_multicst_addr_t **pp;
341 dls_multicst_addr_t *p;
342 uint_t addr_length;
343
344 ASSERT(MAC_PERIM_HELD(dsp->ds_mh));
345
346 /*
347 * Check whether the address is in the list of enabled addresses for
348 * this dld_str_t.
349 */
350 addr_length = dsp->ds_mip->mi_addr_length;
351
352 /*
353 * Protect against concurrent access of ds_dmap by data threads using
354 * ds_rw_lock. The mac perimeter serializes the dls_multicst_add and
355 * remove operations. Dropping the ds_rw_lock across mac calls is thus
356 * ok and is also required by the locking protocol.
357 */
358 rw_enter(&dsp->ds_rw_lock, RW_WRITER);
359 for (pp = &(dsp->ds_dmap); (p = *pp) != NULL; pp = &(p->dma_nextp)) {
360 if (bcmp(addr, p->dma_addr, addr_length) == 0) {
361 /*
362 * It is there so there's nothing to do.
363 */
364 err = 0;
365 goto done;
366 }
367 }
368
369 /*
370 * Allocate a new list item and add it to the list.
371 */
372 p = kmem_zalloc(sizeof (dls_multicst_addr_t), KM_SLEEP);
373 bcopy(addr, p->dma_addr, addr_length);
374 *pp = p;
375 rw_exit(&dsp->ds_rw_lock);
376
377 /*
378 * Enable the address at the MAC.
379 */
380 err = mac_multicast_add(dsp->ds_mch, addr);
381 if (err == 0)
382 return (0);
383
384 /* Undo the operation as it has failed */
385 rw_enter(&dsp->ds_rw_lock, RW_WRITER);
386 ASSERT(*pp == p && p->dma_nextp == NULL);
387 *pp = NULL;
388 kmem_free(p, sizeof (dls_multicst_addr_t));
389 done:
390 rw_exit(&dsp->ds_rw_lock);
391 return (err);
392 }
393
394 int
dls_multicst_remove(dld_str_t * dsp,const uint8_t * addr)395 dls_multicst_remove(dld_str_t *dsp, const uint8_t *addr)
396 {
397 dls_multicst_addr_t **pp;
398 dls_multicst_addr_t *p;
399 uint_t addr_length;
400
401 ASSERT(MAC_PERIM_HELD(dsp->ds_mh));
402
403 /*
404 * Find the address in the list of enabled addresses for this
405 * dld_str_t.
406 */
407 addr_length = dsp->ds_mip->mi_addr_length;
408
409 /*
410 * Protect against concurrent access to ds_dmap by data threads using
411 * ds_rw_lock. The mac perimeter serializes the dls_multicst_add and
412 * remove operations. Dropping the ds_rw_lock across mac calls is thus
413 * ok and is also required by the locking protocol.
414 */
415 rw_enter(&dsp->ds_rw_lock, RW_WRITER);
416 for (pp = &(dsp->ds_dmap); (p = *pp) != NULL; pp = &(p->dma_nextp)) {
417 if (bcmp(addr, p->dma_addr, addr_length) == 0)
418 break;
419 }
420
421 /*
422 * If we walked to the end of the list then the given address is
423 * not currently enabled for this dld_str_t.
424 */
425 if (p == NULL) {
426 rw_exit(&dsp->ds_rw_lock);
427 return (ENOENT);
428 }
429
430 /*
431 * Remove the address from the list.
432 */
433 *pp = p->dma_nextp;
434 rw_exit(&dsp->ds_rw_lock);
435
436 /*
437 * Disable the address at the MAC.
438 */
439 mac_multicast_remove(dsp->ds_mch, addr);
440 kmem_free(p, sizeof (dls_multicst_addr_t));
441 return (0);
442 }
443
444 mblk_t *
dls_header(dld_str_t * dsp,const uint8_t * addr,uint16_t sap,uint_t pri,mblk_t ** payloadp)445 dls_header(dld_str_t *dsp, const uint8_t *addr, uint16_t sap, uint_t pri,
446 mblk_t **payloadp)
447 {
448 uint16_t vid;
449 size_t extra_len;
450 uint16_t mac_sap;
451 mblk_t *mp, *payload;
452 boolean_t is_ethernet = (dsp->ds_mip->mi_media == DL_ETHER);
453 struct ether_vlan_header *evhp;
454
455 vid = mac_client_vid(dsp->ds_mch);
456 payload = (payloadp == NULL) ? NULL : (*payloadp);
457
458 /*
459 * In the case of Ethernet, we need to tell mac_header() if we need
460 * extra room beyond the Ethernet header for a VLAN header. We'll
461 * need to add a VLAN header if this isn't an ETHERTYPE_VLAN listener
462 * (because such streams will be handling VLAN headers on their own)
463 * and one of the following conditions is satisfied:
464 *
465 * - This is a VLAN stream
466 * - This is a physical stream, the priority is not 0, and user
467 * priority tagging is allowed.
468 */
469 if (is_ethernet && sap != ETHERTYPE_VLAN &&
470 (vid != VLAN_ID_NONE ||
471 (pri != 0 && dsp->ds_dlp->dl_tagmode != LINK_TAGMODE_VLANONLY))) {
472 extra_len = sizeof (struct ether_vlan_header) -
473 sizeof (struct ether_header);
474 mac_sap = ETHERTYPE_VLAN;
475 } else {
476 extra_len = 0;
477 mac_sap = sap;
478 }
479
480 mp = mac_header(dsp->ds_mh, addr, mac_sap, payload, extra_len);
481 if (mp == NULL)
482 return (NULL);
483
484 if ((vid == VLAN_ID_NONE && (pri == 0 ||
485 dsp->ds_dlp->dl_tagmode == LINK_TAGMODE_VLANONLY)) || !is_ethernet)
486 return (mp);
487
488 /*
489 * Fill in the tag information.
490 */
491 ASSERT(MBLKL(mp) == sizeof (struct ether_header));
492 if (extra_len != 0) {
493 mp->b_wptr += extra_len;
494 evhp = (struct ether_vlan_header *)mp->b_rptr;
495 evhp->ether_tci = htons(VLAN_TCI(pri, ETHER_CFI, vid));
496 evhp->ether_type = htons(sap);
497 } else {
498 /*
499 * The stream is ETHERTYPE_VLAN listener, so its VLAN tag is
500 * in the payload. Update the priority.
501 */
502 struct ether_vlan_extinfo *extinfo;
503 size_t len = sizeof (struct ether_vlan_extinfo);
504
505 ASSERT(sap == ETHERTYPE_VLAN);
506 ASSERT(payload != NULL);
507
508 if ((DB_REF(payload) > 1) || (MBLKL(payload) < len)) {
509 mblk_t *newmp;
510
511 /*
512 * Because some DLS consumers only check the db_ref
513 * count of the first mblk, we pullup 'payload' into
514 * a single mblk.
515 */
516 newmp = msgpullup(payload, -1);
517 if ((newmp == NULL) || (MBLKL(newmp) < len)) {
518 freemsg(newmp);
519 freemsg(mp);
520 return (NULL);
521 } else {
522 freemsg(payload);
523 *payloadp = payload = newmp;
524 }
525 }
526
527 extinfo = (struct ether_vlan_extinfo *)payload->b_rptr;
528 extinfo->ether_tci = htons(VLAN_TCI(pri, ETHER_CFI,
529 VLAN_ID(ntohs(extinfo->ether_tci))));
530 }
531 return (mp);
532 }
533
534 void
dls_rx_set(dld_str_t * dsp,dls_rx_t rx,void * arg)535 dls_rx_set(dld_str_t *dsp, dls_rx_t rx, void *arg)
536 {
537 mutex_enter(&dsp->ds_lock);
538 dsp->ds_rx = rx;
539 dsp->ds_rx_arg = arg;
540 mutex_exit(&dsp->ds_lock);
541 }
542
543 static boolean_t
dls_accept_common(dld_str_t * dsp,mac_header_info_t * mhip,dls_rx_t * ds_rx,void ** ds_rx_arg,boolean_t promisc,boolean_t promisc_loopback)544 dls_accept_common(dld_str_t *dsp, mac_header_info_t *mhip, dls_rx_t *ds_rx,
545 void **ds_rx_arg, boolean_t promisc, boolean_t promisc_loopback)
546 {
547 dls_multicst_addr_t *dmap;
548 size_t addr_length = dsp->ds_mip->mi_addr_length;
549
550 /*
551 * We must not accept packets if the dld_str_t is not marked as bound
552 * or is being removed.
553 */
554 if (dsp->ds_dlstate != DL_IDLE)
555 goto refuse;
556
557 if (dsp->ds_promisc != 0) {
558 /*
559 * Filter out packets that arrived from the data path
560 * (i_dls_link_rx) when promisc mode is on. We need to correlate
561 * the ds_promisc flags with the mac header destination type. If
562 * only DLS_PROMISC_MULTI is enabled, we need to only reject
563 * multicast packets as those are the only ones which filter up
564 * the promiscuous path. If we have DLS_PROMISC_PHYS or
565 * DLS_PROMISC_SAP set, then we know that we'll be seeing
566 * everything, so we should drop it now.
567 */
568 if (!promisc && !(dsp->ds_promisc == DLS_PROMISC_MULTI &&
569 mhip->mhi_dsttype != MAC_ADDRTYPE_MULTICAST))
570 goto refuse;
571 /*
572 * If the dls_impl_t is in 'all physical' mode then
573 * always accept.
574 */
575 if (dsp->ds_promisc & DLS_PROMISC_PHYS)
576 goto accept;
577
578 /*
579 * Loopback packets i.e. packets sent out by DLS on a given
580 * mac end point, will be accepted back by DLS on loopback
581 * from the mac, only in the 'all physical' mode which has been
582 * covered by the previous check above
583 */
584 if (promisc_loopback)
585 goto refuse;
586 }
587
588 switch (mhip->mhi_dsttype) {
589 case MAC_ADDRTYPE_UNICAST:
590 case MAC_ADDRTYPE_BROADCAST:
591 /*
592 * We can accept unicast and broadcast packets because
593 * filtering is already done by the mac layer.
594 */
595 goto accept;
596 case MAC_ADDRTYPE_MULTICAST:
597 /*
598 * Additional filtering is needed for multicast addresses
599 * because different streams may be interested in different
600 * addresses.
601 */
602 if (dsp->ds_promisc & DLS_PROMISC_MULTI)
603 goto accept;
604
605 rw_enter(&dsp->ds_rw_lock, RW_READER);
606 for (dmap = dsp->ds_dmap; dmap != NULL;
607 dmap = dmap->dma_nextp) {
608 if (memcmp(mhip->mhi_daddr, dmap->dma_addr,
609 addr_length) == 0) {
610 rw_exit(&dsp->ds_rw_lock);
611 goto accept;
612 }
613 }
614 rw_exit(&dsp->ds_rw_lock);
615 break;
616 }
617
618 refuse:
619 return (B_FALSE);
620
621 accept:
622 /*
623 * the returned ds_rx and ds_rx_arg will always be in sync.
624 */
625 mutex_enter(&dsp->ds_lock);
626 *ds_rx = dsp->ds_rx;
627 *ds_rx_arg = dsp->ds_rx_arg;
628 mutex_exit(&dsp->ds_lock);
629
630 return (B_TRUE);
631 }
632
633 /* ARGSUSED */
634 boolean_t
dls_accept(dld_str_t * dsp,mac_header_info_t * mhip,dls_rx_t * ds_rx,void ** ds_rx_arg)635 dls_accept(dld_str_t *dsp, mac_header_info_t *mhip, dls_rx_t *ds_rx,
636 void **ds_rx_arg)
637 {
638 return (dls_accept_common(dsp, mhip, ds_rx, ds_rx_arg, B_FALSE,
639 B_FALSE));
640 }
641
642 boolean_t
dls_accept_promisc(dld_str_t * dsp,mac_header_info_t * mhip,dls_rx_t * ds_rx,void ** ds_rx_arg,boolean_t loopback)643 dls_accept_promisc(dld_str_t *dsp, mac_header_info_t *mhip, dls_rx_t *ds_rx,
644 void **ds_rx_arg, boolean_t loopback)
645 {
646 return (dls_accept_common(dsp, mhip, ds_rx, ds_rx_arg, B_TRUE,
647 loopback));
648 }
649
650 int
dls_mac_active_set(dls_link_t * dlp)651 dls_mac_active_set(dls_link_t *dlp)
652 {
653 int err = 0;
654
655 /*
656 * First client; add the primary unicast address.
657 */
658 if (dlp->dl_nactive == 0) {
659 /*
660 * First client; add the primary unicast address.
661 */
662 mac_diag_t diag;
663
664 /* request the primary MAC address */
665 if ((err = mac_unicast_add(dlp->dl_mch, NULL,
666 MAC_UNICAST_PRIMARY | MAC_UNICAST_TAG_DISABLE |
667 MAC_UNICAST_DISABLE_TX_VID_CHECK, &dlp->dl_mah,
668 VLAN_ID_NONE, &diag)) != 0) {
669 return (err);
670 }
671
672 /*
673 * Set the function to start receiving packets.
674 */
675 mac_rx_set(dlp->dl_mch, i_dls_link_rx, dlp);
676 }
677 dlp->dl_nactive++;
678 return (0);
679 }
680
681 void
dls_mac_active_clear(dls_link_t * dlp)682 dls_mac_active_clear(dls_link_t *dlp)
683 {
684 if (--dlp->dl_nactive == 0) {
685 ASSERT(dlp->dl_mah != NULL);
686 (void) mac_unicast_remove(dlp->dl_mch, dlp->dl_mah);
687 dlp->dl_mah = NULL;
688 mac_rx_clear(dlp->dl_mch);
689 }
690 }
691
692 int
dls_active_set(dld_str_t * dsp)693 dls_active_set(dld_str_t *dsp)
694 {
695 int err = 0;
696
697 ASSERT(MAC_PERIM_HELD(dsp->ds_mh));
698
699 if (dsp->ds_passivestate == DLD_PASSIVE)
700 return (0);
701
702 /* If we're already active, then there's nothing more to do. */
703 if ((dsp->ds_nactive == 0) &&
704 ((err = dls_mac_active_set(dsp->ds_dlp)) != 0)) {
705 /* except for ENXIO all other errors are mapped to EBUSY */
706 if (err != ENXIO)
707 return (EBUSY);
708 return (err);
709 }
710
711 dsp->ds_passivestate = DLD_ACTIVE;
712 dsp->ds_nactive++;
713 return (0);
714 }
715
716 /*
717 * Note that dls_active_set() is called whenever an active operation
718 * (DL_BIND_REQ, DL_ENABMULTI_REQ ...) is processed and
719 * dls_active_clear(dsp, B_FALSE) is called whenever the active operation
720 * is being undone (DL_UNBIND_REQ, DL_DISABMULTI_REQ ...). In some cases,
721 * a stream is closed without every active operation being undone and we
722 * need to clear all the "active" states by calling
723 * dls_active_clear(dsp, B_TRUE).
724 */
725 void
dls_active_clear(dld_str_t * dsp,boolean_t all)726 dls_active_clear(dld_str_t *dsp, boolean_t all)
727 {
728 ASSERT(MAC_PERIM_HELD(dsp->ds_mh));
729
730 if (dsp->ds_passivestate == DLD_PASSIVE)
731 return;
732
733 if (all && dsp->ds_nactive == 0)
734 return;
735
736 ASSERT(dsp->ds_nactive > 0);
737
738 dsp->ds_nactive -= (all ? dsp->ds_nactive : 1);
739 if (dsp->ds_nactive != 0)
740 return;
741
742 ASSERT(dsp->ds_passivestate == DLD_ACTIVE);
743 dls_mac_active_clear(dsp->ds_dlp);
744 dsp->ds_passivestate = DLD_UNINITIALIZED;
745 }
746