1 /*-
2 * Copyright (c) 1980, 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 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)if.c 8.5 (Berkeley) 1/9/95
30 * $FreeBSD: stable/9/sys/net/if.c 280257 2015-03-19 13:33:15Z ae $
31 */
32
33 #include "opt_compat.h"
34 #include "opt_inet6.h"
35 #include "opt_inet.h"
36
37 #include <sys/param.h>
38 #include <sys/types.h>
39 #include <sys/conf.h>
40 #include <sys/malloc.h>
41 #include <sys/sbuf.h>
42 #include <sys/bus.h>
43 #include <sys/mbuf.h>
44 #include <sys/systm.h>
45 #include <sys/priv.h>
46 #include <sys/proc.h>
47 #include <sys/socket.h>
48 #include <sys/socketvar.h>
49 #include <sys/protosw.h>
50 #include <sys/kernel.h>
51 #include <sys/lock.h>
52 #include <sys/refcount.h>
53 #include <sys/module.h>
54 #include <sys/rwlock.h>
55 #include <sys/sockio.h>
56 #include <sys/syslog.h>
57 #include <sys/sysctl.h>
58 #include <sys/taskqueue.h>
59 #include <sys/domain.h>
60 #include <sys/jail.h>
61 #include <sys/priv.h>
62
63 #include <machine/stdarg.h>
64 #include <vm/uma.h>
65
66 #include <net/if.h>
67 #include <net/if_arp.h>
68 #include <net/if_clone.h>
69 #include <net/if_dl.h>
70 #include <net/if_types.h>
71 #include <net/if_var.h>
72 #include <net/radix.h>
73 #include <net/route.h>
74 #include <net/vnet.h>
75
76 #if defined(INET) || defined(INET6)
77 #include <net/ethernet.h>
78 #include <netinet/in.h>
79 #include <netinet/in_var.h>
80 #include <netinet/ip.h>
81 #include <netinet/ip_carp.h>
82 #ifdef INET
83 #include <netinet/if_ether.h>
84 #endif /* INET */
85 #ifdef INET6
86 #include <netinet6/in6_var.h>
87 #include <netinet6/in6_ifattach.h>
88 #endif /* INET6 */
89 #endif /* INET || INET6 */
90
91 #include <security/mac/mac_framework.h>
92
93 #ifdef COMPAT_FREEBSD32
94 #include <sys/mount.h>
95 #include <compat/freebsd32/freebsd32.h>
96 #endif
97
98 struct ifindex_entry {
99 struct ifnet *ife_ifnet;
100 };
101
102 SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers");
103 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management");
104
105 TUNABLE_INT("net.link.ifqmaxlen", &ifqmaxlen);
106 SYSCTL_INT(_net_link, OID_AUTO, ifqmaxlen, CTLFLAG_RDTUN,
107 &ifqmaxlen, 0, "max send queue size");
108
109 /* Log link state change events */
110 static int log_link_state_change = 1;
111
112 SYSCTL_INT(_net_link, OID_AUTO, log_link_state_change, CTLFLAG_RW,
113 &log_link_state_change, 0,
114 "log interface link state change events");
115
116 /* Interface description */
117 static unsigned int ifdescr_maxlen = 1024;
118 SYSCTL_UINT(_net, OID_AUTO, ifdescr_maxlen, CTLFLAG_RW,
119 &ifdescr_maxlen, 0,
120 "administrative maximum length for interface description");
121
122 static MALLOC_DEFINE(M_IFDESCR, "ifdescr", "ifnet descriptions");
123
124 /* global sx for non-critical path ifdescr */
125 static struct sx ifdescr_sx;
126 SX_SYSINIT(ifdescr_sx, &ifdescr_sx, "ifnet descr");
127
128 void (*bridge_linkstate_p)(struct ifnet *ifp);
129 void (*ng_ether_link_state_p)(struct ifnet *ifp, int state);
130 void (*lagg_linkstate_p)(struct ifnet *ifp, int state);
131 /* These are external hooks for CARP. */
132 void (*carp_linkstate_p)(struct ifnet *ifp);
133 #if defined(INET) || defined(INET6)
134 struct ifnet *(*carp_forus_p)(struct ifnet *ifp, u_char *dhost);
135 int (*carp_output_p)(struct ifnet *ifp, struct mbuf *m,
136 struct sockaddr *sa, struct rtentry *rt);
137 #endif
138 #ifdef INET
139 int (*carp_iamatch_p)(struct ifnet *, struct in_ifaddr *, struct in_addr *,
140 u_int8_t **);
141 #endif
142 #ifdef INET6
143 struct ifaddr *(*carp_iamatch6_p)(struct ifnet *ifp, struct in6_addr *taddr6);
144 caddr_t (*carp_macmatch6_p)(struct ifnet *ifp, struct mbuf *m,
145 const struct in6_addr *taddr);
146 #endif
147
148 struct mbuf *(*tbr_dequeue_ptr)(struct ifaltq *, int) = NULL;
149
150 /*
151 * XXX: Style; these should be sorted alphabetically, and unprototyped
152 * static functions should be prototyped. Currently they are sorted by
153 * declaration order.
154 */
155 static void if_attachdomain(void *);
156 static void if_attachdomain1(struct ifnet *);
157 static int ifconf(u_long, caddr_t);
158 static void if_freemulti(struct ifmultiaddr *);
159 static void if_init(void *);
160 static void if_grow(void);
161 static void if_input_default(struct ifnet *, struct mbuf *);
162 static void if_route(struct ifnet *, int flag, int fam);
163 static int if_setflag(struct ifnet *, int, int, int *, int);
164 static int if_transmit(struct ifnet *ifp, struct mbuf *m);
165 static void if_unroute(struct ifnet *, int flag, int fam);
166 static void link_rtrequest(int, struct rtentry *, struct rt_addrinfo *);
167 static int if_rtdel(struct radix_node *, void *);
168 static int ifhwioctl(u_long, struct ifnet *, caddr_t, struct thread *);
169 static int if_delmulti_locked(struct ifnet *, struct ifmultiaddr *, int);
170 static void do_link_state_change(void *, int);
171 static int if_getgroup(struct ifgroupreq *, struct ifnet *);
172 static int if_getgroupmembers(struct ifgroupreq *);
173 static void if_delgroups(struct ifnet *);
174 static void if_attach_internal(struct ifnet *, int);
175 static void if_detach_internal(struct ifnet *, int);
176
177 #ifdef INET6
178 /*
179 * XXX: declare here to avoid to include many inet6 related files..
180 * should be more generalized?
181 */
182 extern void nd6_setmtu(struct ifnet *);
183 #endif
184
185 VNET_DEFINE(int, if_index);
186 int ifqmaxlen = IFQ_MAXLEN;
187 VNET_DEFINE(struct ifnethead, ifnet); /* depend on static init XXX */
188 VNET_DEFINE(struct ifgrouphead, ifg_head);
189
190 static VNET_DEFINE(int, if_indexlim) = 8;
191
192 /* Table of ifnet by index. */
193 VNET_DEFINE(struct ifindex_entry *, ifindex_table);
194
195 #define V_if_indexlim VNET(if_indexlim)
196 #define V_ifindex_table VNET(ifindex_table)
197
198 /*
199 * The global network interface list (V_ifnet) and related state (such as
200 * if_index, if_indexlim, and ifindex_table) are protected by an sxlock and
201 * an rwlock. Either may be acquired shared to stablize the list, but both
202 * must be acquired writable to modify the list. This model allows us to
203 * both stablize the interface list during interrupt thread processing, but
204 * also to stablize it over long-running ioctls, without introducing priority
205 * inversions and deadlocks.
206 */
207 struct rwlock ifnet_rwlock;
208 struct sx ifnet_sxlock;
209
210 /*
211 * The allocation of network interfaces is a rather non-atomic affair; we
212 * need to select an index before we are ready to expose the interface for
213 * use, so will use this pointer value to indicate reservation.
214 */
215 #define IFNET_HOLD (void *)(uintptr_t)(-1)
216
217 static if_com_alloc_t *if_com_alloc[256];
218 static if_com_free_t *if_com_free[256];
219
220 static MALLOC_DEFINE(M_IFNET, "ifnet", "interface internals");
221 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address");
222 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address");
223
224 struct ifnet *
ifnet_byindex_locked(u_short idx)225 ifnet_byindex_locked(u_short idx)
226 {
227
228 if (idx > V_if_index)
229 return (NULL);
230 if (V_ifindex_table[idx].ife_ifnet == IFNET_HOLD)
231 return (NULL);
232 return (V_ifindex_table[idx].ife_ifnet);
233 }
234
235 struct ifnet *
ifnet_byindex(u_short idx)236 ifnet_byindex(u_short idx)
237 {
238 struct ifnet *ifp;
239
240 IFNET_RLOCK_NOSLEEP();
241 ifp = ifnet_byindex_locked(idx);
242 IFNET_RUNLOCK_NOSLEEP();
243 return (ifp);
244 }
245
246 struct ifnet *
ifnet_byindex_ref(u_short idx)247 ifnet_byindex_ref(u_short idx)
248 {
249 struct ifnet *ifp;
250
251 IFNET_RLOCK_NOSLEEP();
252 ifp = ifnet_byindex_locked(idx);
253 if (ifp == NULL || (ifp->if_flags & IFF_DYING)) {
254 IFNET_RUNLOCK_NOSLEEP();
255 return (NULL);
256 }
257 if_ref(ifp);
258 IFNET_RUNLOCK_NOSLEEP();
259 return (ifp);
260 }
261
262 /*
263 * Allocate an ifindex array entry; return 0 on success or an error on
264 * failure.
265 */
266 static int
ifindex_alloc_locked(u_short * idxp)267 ifindex_alloc_locked(u_short *idxp)
268 {
269 u_short idx;
270
271 IFNET_WLOCK_ASSERT();
272
273 retry:
274 /*
275 * Try to find an empty slot below V_if_index. If we fail, take the
276 * next slot.
277 */
278 for (idx = 1; idx <= V_if_index; idx++) {
279 if (V_ifindex_table[idx].ife_ifnet == NULL)
280 break;
281 }
282
283 /* Catch if_index overflow. */
284 if (idx < 1)
285 return (ENOSPC);
286 if (idx >= V_if_indexlim) {
287 if_grow();
288 goto retry;
289 }
290 if (idx > V_if_index)
291 V_if_index = idx;
292 *idxp = idx;
293 return (0);
294 }
295
296 static void
ifindex_free_locked(u_short idx)297 ifindex_free_locked(u_short idx)
298 {
299
300 IFNET_WLOCK_ASSERT();
301
302 V_ifindex_table[idx].ife_ifnet = NULL;
303 while (V_if_index > 0 &&
304 V_ifindex_table[V_if_index].ife_ifnet == NULL)
305 V_if_index--;
306 }
307
308 static void
ifindex_free(u_short idx)309 ifindex_free(u_short idx)
310 {
311
312 IFNET_WLOCK();
313 ifindex_free_locked(idx);
314 IFNET_WUNLOCK();
315 }
316
317 static void
ifnet_setbyindex_locked(u_short idx,struct ifnet * ifp)318 ifnet_setbyindex_locked(u_short idx, struct ifnet *ifp)
319 {
320
321 IFNET_WLOCK_ASSERT();
322
323 V_ifindex_table[idx].ife_ifnet = ifp;
324 }
325
326 static void
ifnet_setbyindex(u_short idx,struct ifnet * ifp)327 ifnet_setbyindex(u_short idx, struct ifnet *ifp)
328 {
329
330 IFNET_WLOCK();
331 ifnet_setbyindex_locked(idx, ifp);
332 IFNET_WUNLOCK();
333 }
334
335 struct ifaddr *
ifaddr_byindex(u_short idx)336 ifaddr_byindex(u_short idx)
337 {
338 struct ifaddr *ifa;
339
340 IFNET_RLOCK_NOSLEEP();
341 ifa = ifnet_byindex_locked(idx)->if_addr;
342 if (ifa != NULL)
343 ifa_ref(ifa);
344 IFNET_RUNLOCK_NOSLEEP();
345 return (ifa);
346 }
347
348 /*
349 * Network interface utility routines.
350 *
351 * Routines with ifa_ifwith* names take sockaddr *'s as
352 * parameters.
353 */
354
355 static void
vnet_if_init(const void * unused __unused)356 vnet_if_init(const void *unused __unused)
357 {
358
359 TAILQ_INIT(&V_ifnet);
360 TAILQ_INIT(&V_ifg_head);
361 IFNET_WLOCK();
362 if_grow(); /* create initial table */
363 IFNET_WUNLOCK();
364 vnet_if_clone_init();
365 }
366 VNET_SYSINIT(vnet_if_init, SI_SUB_INIT_IF, SI_ORDER_SECOND, vnet_if_init,
367 NULL);
368
369 /* ARGSUSED*/
370 static void
if_init(void * dummy __unused)371 if_init(void *dummy __unused)
372 {
373
374 IFNET_LOCK_INIT();
375 if_clone_init();
376 }
377 SYSINIT(interfaces, SI_SUB_INIT_IF, SI_ORDER_FIRST, if_init, NULL);
378
379
380 #ifdef VIMAGE
381 static void
vnet_if_uninit(const void * unused __unused)382 vnet_if_uninit(const void *unused __unused)
383 {
384
385 VNET_ASSERT(TAILQ_EMPTY(&V_ifnet), ("%s:%d tailq &V_ifnet=%p "
386 "not empty", __func__, __LINE__, &V_ifnet));
387 VNET_ASSERT(TAILQ_EMPTY(&V_ifg_head), ("%s:%d tailq &V_ifg_head=%p "
388 "not empty", __func__, __LINE__, &V_ifg_head));
389
390 free((caddr_t)V_ifindex_table, M_IFNET);
391 }
392 VNET_SYSUNINIT(vnet_if_uninit, SI_SUB_INIT_IF, SI_ORDER_FIRST,
393 vnet_if_uninit, NULL);
394 #endif
395
396 static void
if_grow(void)397 if_grow(void)
398 {
399 int oldlim;
400 u_int n;
401 struct ifindex_entry *e;
402
403 IFNET_WLOCK_ASSERT();
404 oldlim = V_if_indexlim;
405 IFNET_WUNLOCK();
406 n = (oldlim << 1) * sizeof(*e);
407 e = malloc(n, M_IFNET, M_WAITOK | M_ZERO);
408 IFNET_WLOCK();
409 if (V_if_indexlim != oldlim) {
410 free(e, M_IFNET);
411 return;
412 }
413 if (V_ifindex_table != NULL) {
414 memcpy((caddr_t)e, (caddr_t)V_ifindex_table, n/2);
415 free((caddr_t)V_ifindex_table, M_IFNET);
416 }
417 V_if_indexlim <<= 1;
418 V_ifindex_table = e;
419 }
420
421 /*
422 * Allocate a struct ifnet and an index for an interface. A layer 2
423 * common structure will also be allocated if an allocation routine is
424 * registered for the passed type.
425 */
426 struct ifnet *
if_alloc(u_char type)427 if_alloc(u_char type)
428 {
429 struct ifnet *ifp;
430 u_short idx;
431
432 ifp = malloc(sizeof(struct ifnet), M_IFNET, M_WAITOK|M_ZERO);
433 IFNET_WLOCK();
434 if (ifindex_alloc_locked(&idx) != 0) {
435 IFNET_WUNLOCK();
436 free(ifp, M_IFNET);
437 return (NULL);
438 }
439 ifnet_setbyindex_locked(idx, IFNET_HOLD);
440 IFNET_WUNLOCK();
441 ifp->if_index = idx;
442 ifp->if_type = type;
443 ifp->if_alloctype = type;
444 if (if_com_alloc[type] != NULL) {
445 ifp->if_l2com = if_com_alloc[type](type, ifp);
446 if (ifp->if_l2com == NULL) {
447 free(ifp, M_IFNET);
448 ifindex_free(idx);
449 return (NULL);
450 }
451 }
452
453 IF_ADDR_LOCK_INIT(ifp);
454 TASK_INIT(&ifp->if_linktask, 0, do_link_state_change, ifp);
455 ifp->if_afdata_initialized = 0;
456 IF_AFDATA_LOCK_INIT(ifp);
457 TAILQ_INIT(&ifp->if_addrhead);
458 TAILQ_INIT(&ifp->if_prefixhead);
459 TAILQ_INIT(&ifp->if_multiaddrs);
460 TAILQ_INIT(&ifp->if_groups);
461 #ifdef MAC
462 mac_ifnet_init(ifp);
463 #endif
464 ifq_init(&ifp->if_snd, ifp);
465
466 refcount_init(&ifp->if_refcount, 1); /* Index reference. */
467 ifnet_setbyindex(ifp->if_index, ifp);
468 return (ifp);
469 }
470
471 /*
472 * Do the actual work of freeing a struct ifnet, and layer 2 common
473 * structure. This call is made when the last reference to an
474 * interface is released.
475 */
476 static void
if_free_internal(struct ifnet * ifp)477 if_free_internal(struct ifnet *ifp)
478 {
479
480 KASSERT((ifp->if_flags & IFF_DYING),
481 ("if_free_internal: interface not dying"));
482
483 if (if_com_free[ifp->if_alloctype] != NULL)
484 if_com_free[ifp->if_alloctype](ifp->if_l2com,
485 ifp->if_alloctype);
486
487 #ifdef MAC
488 mac_ifnet_destroy(ifp);
489 #endif /* MAC */
490 if (ifp->if_description != NULL)
491 free(ifp->if_description, M_IFDESCR);
492 IF_AFDATA_DESTROY(ifp);
493 IF_ADDR_LOCK_DESTROY(ifp);
494 ifq_delete(&ifp->if_snd);
495 free(ifp, M_IFNET);
496 }
497
498 /*
499 * This version should only be called by intefaces that switch their type
500 * after calling if_alloc(). if_free_type() will go away again now that we
501 * have if_alloctype to cache the original allocation type. For now, assert
502 * that they match, since we require that in practice.
503 */
504 void
if_free_type(struct ifnet * ifp,u_char type)505 if_free_type(struct ifnet *ifp, u_char type)
506 {
507
508 KASSERT(ifp->if_alloctype == type,
509 ("if_free_type: type (%d) != alloctype (%d)", type,
510 ifp->if_alloctype));
511
512 ifp->if_flags |= IFF_DYING; /* XXX: Locking */
513
514 CURVNET_SET_QUIET(ifp->if_vnet);
515 IFNET_WLOCK();
516 KASSERT(ifp == ifnet_byindex_locked(ifp->if_index),
517 ("%s: freeing unallocated ifnet", ifp->if_xname));
518
519 ifindex_free_locked(ifp->if_index);
520 IFNET_WUNLOCK();
521
522 if (refcount_release(&ifp->if_refcount))
523 if_free_internal(ifp);
524 CURVNET_RESTORE();
525 }
526
527 /*
528 * This is the normal version of if_free(), used by device drivers to free a
529 * detached network interface. The contents of if_free_type() will move into
530 * here when if_free_type() goes away.
531 */
532 void
if_free(struct ifnet * ifp)533 if_free(struct ifnet *ifp)
534 {
535
536 if_free_type(ifp, ifp->if_alloctype);
537 }
538
539 /*
540 * Interfaces to keep an ifnet type-stable despite the possibility of the
541 * driver calling if_free(). If there are additional references, we defer
542 * freeing the underlying data structure.
543 */
544 void
if_ref(struct ifnet * ifp)545 if_ref(struct ifnet *ifp)
546 {
547
548 /* We don't assert the ifnet list lock here, but arguably should. */
549 refcount_acquire(&ifp->if_refcount);
550 }
551
552 void
if_rele(struct ifnet * ifp)553 if_rele(struct ifnet *ifp)
554 {
555
556 if (!refcount_release(&ifp->if_refcount))
557 return;
558 if_free_internal(ifp);
559 }
560
561 void
ifq_init(struct ifaltq * ifq,struct ifnet * ifp)562 ifq_init(struct ifaltq *ifq, struct ifnet *ifp)
563 {
564
565 mtx_init(&ifq->ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF);
566
567 if (ifq->ifq_maxlen == 0)
568 ifq->ifq_maxlen = ifqmaxlen;
569
570 ifq->altq_type = 0;
571 ifq->altq_disc = NULL;
572 ifq->altq_flags &= ALTQF_CANTCHANGE;
573 ifq->altq_tbr = NULL;
574 ifq->altq_ifp = ifp;
575 }
576
577 void
ifq_delete(struct ifaltq * ifq)578 ifq_delete(struct ifaltq *ifq)
579 {
580 mtx_destroy(&ifq->ifq_mtx);
581 }
582
583 /*
584 * Perform generic interface initalization tasks and attach the interface
585 * to the list of "active" interfaces. If vmove flag is set on entry
586 * to if_attach_internal(), perform only a limited subset of initialization
587 * tasks, given that we are moving from one vnet to another an ifnet which
588 * has already been fully initialized.
589 *
590 * XXX:
591 * - The decision to return void and thus require this function to
592 * succeed is questionable.
593 * - We should probably do more sanity checking. For instance we don't
594 * do anything to insure if_xname is unique or non-empty.
595 */
596 void
if_attach(struct ifnet * ifp)597 if_attach(struct ifnet *ifp)
598 {
599
600 if_attach_internal(ifp, 0);
601 }
602
603 /*
604 * Compute the least common TSO limit.
605 */
606 void
if_hw_tsomax_common(struct ifnet * ifp,struct ifnet_hw_tsomax * pmax)607 if_hw_tsomax_common(struct ifnet *ifp, struct ifnet_hw_tsomax *pmax)
608 {
609 /*
610 * 1) If there is no limit currently, take the limit from
611 * the network adapter.
612 *
613 * 2) If the network adapter has a limit below the current
614 * limit, apply it.
615 */
616 if (pmax->tsomaxbytes == 0 || (ifp->if_hw_tsomax != 0 &&
617 ifp->if_hw_tsomax < pmax->tsomaxbytes)) {
618 pmax->tsomaxbytes = ifp->if_hw_tsomax;
619 }
620 if (pmax->tsomaxsegcount == 0 || (ifp->if_hw_tsomaxsegcount != 0 &&
621 ifp->if_hw_tsomaxsegcount < pmax->tsomaxsegcount)) {
622 pmax->tsomaxsegcount = ifp->if_hw_tsomaxsegcount;
623 }
624 if (pmax->tsomaxsegsize == 0 || (ifp->if_hw_tsomaxsegsize != 0 &&
625 ifp->if_hw_tsomaxsegsize < pmax->tsomaxsegsize)) {
626 pmax->tsomaxsegsize = ifp->if_hw_tsomaxsegsize;
627 }
628 }
629
630 /*
631 * Update TSO limit of a network adapter.
632 *
633 * Returns zero if no change. Else non-zero.
634 */
635 int
if_hw_tsomax_update(struct ifnet * ifp,struct ifnet_hw_tsomax * pmax)636 if_hw_tsomax_update(struct ifnet *ifp, struct ifnet_hw_tsomax *pmax)
637 {
638 int retval = 0;
639 if (ifp->if_hw_tsomax != pmax->tsomaxbytes) {
640 ifp->if_hw_tsomax = pmax->tsomaxbytes;
641 retval++;
642 }
643 if (ifp->if_hw_tsomaxsegsize != pmax->tsomaxsegsize) {
644 ifp->if_hw_tsomaxsegsize = pmax->tsomaxsegsize;
645 retval++;
646 }
647 if (ifp->if_hw_tsomaxsegcount != pmax->tsomaxsegcount) {
648 ifp->if_hw_tsomaxsegcount = pmax->tsomaxsegcount;
649 retval++;
650 }
651 return (retval);
652 }
653
654 static void
if_attach_internal(struct ifnet * ifp,int vmove)655 if_attach_internal(struct ifnet *ifp, int vmove)
656 {
657 unsigned socksize, ifasize;
658 int namelen, masklen;
659 struct sockaddr_dl *sdl;
660 struct ifaddr *ifa;
661
662 if (ifp->if_index == 0 || ifp != ifnet_byindex(ifp->if_index))
663 panic ("%s: BUG: if_attach called without if_alloc'd input()\n",
664 ifp->if_xname);
665
666 #ifdef VIMAGE
667 ifp->if_vnet = curvnet;
668 if (ifp->if_home_vnet == NULL)
669 ifp->if_home_vnet = curvnet;
670 #endif
671
672 if_addgroup(ifp, IFG_ALL);
673
674 getmicrotime(&ifp->if_lastchange);
675 ifp->if_data.ifi_epoch = time_uptime;
676 ifp->if_data.ifi_datalen = sizeof(struct if_data);
677
678 KASSERT((ifp->if_transmit == NULL && ifp->if_qflush == NULL) ||
679 (ifp->if_transmit != NULL && ifp->if_qflush != NULL),
680 ("transmit and qflush must both either be set or both be NULL"));
681 if (ifp->if_transmit == NULL) {
682 ifp->if_transmit = if_transmit;
683 ifp->if_qflush = if_qflush;
684 }
685 if (ifp->if_input == NULL)
686 ifp->if_input = if_input_default;
687
688 if (!vmove) {
689 #ifdef MAC
690 mac_ifnet_create(ifp);
691 #endif
692
693 /*
694 * Create a Link Level name for this device.
695 */
696 namelen = strlen(ifp->if_xname);
697 /*
698 * Always save enough space for any possiable name so we
699 * can do a rename in place later.
700 */
701 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ;
702 socksize = masklen + ifp->if_addrlen;
703 if (socksize < sizeof(*sdl))
704 socksize = sizeof(*sdl);
705 socksize = roundup2(socksize, sizeof(long));
706 ifasize = sizeof(*ifa) + 2 * socksize;
707 ifa = malloc(ifasize, M_IFADDR, M_WAITOK | M_ZERO);
708 ifa_init(ifa);
709 sdl = (struct sockaddr_dl *)(ifa + 1);
710 sdl->sdl_len = socksize;
711 sdl->sdl_family = AF_LINK;
712 bcopy(ifp->if_xname, sdl->sdl_data, namelen);
713 sdl->sdl_nlen = namelen;
714 sdl->sdl_index = ifp->if_index;
715 sdl->sdl_type = ifp->if_type;
716 ifp->if_addr = ifa;
717 ifa->ifa_ifp = ifp;
718 ifa->ifa_rtrequest = link_rtrequest;
719 ifa->ifa_addr = (struct sockaddr *)sdl;
720 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl);
721 ifa->ifa_netmask = (struct sockaddr *)sdl;
722 sdl->sdl_len = masklen;
723 while (namelen != 0)
724 sdl->sdl_data[--namelen] = 0xff;
725 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link);
726 /* Reliably crash if used uninitialized. */
727 ifp->if_broadcastaddr = NULL;
728
729 #if defined(INET) || defined(INET6)
730 /* Use defaults for TSO, if nothing is set */
731 if (ifp->if_hw_tsomax == 0 &&
732 ifp->if_hw_tsomaxsegcount == 0 &&
733 ifp->if_hw_tsomaxsegsize == 0) {
734 /*
735 * The TSO defaults needs to be such that an
736 * NFS mbuf list of 35 mbufs totalling just
737 * below 64K works and that a chain of mbufs
738 * can be defragged into at most 32 segments:
739 */
740 ifp->if_hw_tsomax = min(IP_MAXPACKET, (32 * MCLBYTES) -
741 (ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN));
742 ifp->if_hw_tsomaxsegcount = 35;
743 ifp->if_hw_tsomaxsegsize = 2048; /* 2K */
744
745 /* XXX some drivers set IFCAP_TSO after ethernet attach */
746 if (ifp->if_capabilities & IFCAP_TSO) {
747 if_printf(ifp, "Using defaults for TSO: %u/%u/%u\n",
748 ifp->if_hw_tsomax,
749 ifp->if_hw_tsomaxsegcount,
750 ifp->if_hw_tsomaxsegsize);
751 }
752 }
753 #endif
754 }
755 #ifdef VIMAGE
756 else {
757 /*
758 * Update the interface index in the link layer address
759 * of the interface.
760 */
761 for (ifa = ifp->if_addr; ifa != NULL;
762 ifa = TAILQ_NEXT(ifa, ifa_link)) {
763 if (ifa->ifa_addr->sa_family == AF_LINK) {
764 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
765 sdl->sdl_index = ifp->if_index;
766 }
767 }
768 }
769 #endif
770
771 IFNET_WLOCK();
772 TAILQ_INSERT_TAIL(&V_ifnet, ifp, if_link);
773 #ifdef VIMAGE
774 curvnet->vnet_ifcnt++;
775 #endif
776 IFNET_WUNLOCK();
777
778 if (domain_init_status >= 2)
779 if_attachdomain1(ifp);
780
781 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp);
782 if (IS_DEFAULT_VNET(curvnet))
783 devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL);
784
785 /* Announce the interface. */
786 rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
787 }
788
789 static void
if_attachdomain(void * dummy)790 if_attachdomain(void *dummy)
791 {
792 struct ifnet *ifp;
793 int s;
794
795 s = splnet();
796 TAILQ_FOREACH(ifp, &V_ifnet, if_link)
797 if_attachdomain1(ifp);
798 splx(s);
799 }
800 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND,
801 if_attachdomain, NULL);
802
803 static void
if_attachdomain1(struct ifnet * ifp)804 if_attachdomain1(struct ifnet *ifp)
805 {
806 struct domain *dp;
807 int s;
808
809 s = splnet();
810
811 /*
812 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we
813 * cannot lock ifp->if_afdata initialization, entirely.
814 */
815 if (IF_AFDATA_TRYLOCK(ifp) == 0) {
816 splx(s);
817 return;
818 }
819 if (ifp->if_afdata_initialized >= domain_init_status) {
820 IF_AFDATA_UNLOCK(ifp);
821 splx(s);
822 printf("if_attachdomain called more than once on %s\n",
823 ifp->if_xname);
824 return;
825 }
826 ifp->if_afdata_initialized = domain_init_status;
827 IF_AFDATA_UNLOCK(ifp);
828
829 /* address family dependent data region */
830 bzero(ifp->if_afdata, sizeof(ifp->if_afdata));
831 for (dp = domains; dp; dp = dp->dom_next) {
832 if (dp->dom_ifattach)
833 ifp->if_afdata[dp->dom_family] =
834 (*dp->dom_ifattach)(ifp);
835 }
836
837 splx(s);
838 }
839
840 /*
841 * Remove any unicast or broadcast network addresses from an interface.
842 */
843 void
if_purgeaddrs(struct ifnet * ifp)844 if_purgeaddrs(struct ifnet *ifp)
845 {
846 struct ifaddr *ifa, *next;
847
848 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) {
849 if (ifa->ifa_addr->sa_family == AF_LINK)
850 continue;
851 #ifdef INET
852 /* XXX: Ugly!! ad hoc just for INET */
853 if (ifa->ifa_addr->sa_family == AF_INET) {
854 struct ifaliasreq ifr;
855
856 bzero(&ifr, sizeof(ifr));
857 ifr.ifra_addr = *ifa->ifa_addr;
858 if (ifa->ifa_dstaddr)
859 ifr.ifra_broadaddr = *ifa->ifa_dstaddr;
860 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp,
861 NULL) == 0)
862 continue;
863 }
864 #endif /* INET */
865 #ifdef INET6
866 if (ifa->ifa_addr->sa_family == AF_INET6) {
867 in6_purgeaddr(ifa);
868 /* ifp_addrhead is already updated */
869 continue;
870 }
871 #endif /* INET6 */
872 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link);
873 ifa_free(ifa);
874 }
875 }
876
877 /*
878 * Remove any multicast network addresses from an interface when an ifnet
879 * is going away.
880 */
881 static void
if_purgemaddrs(struct ifnet * ifp)882 if_purgemaddrs(struct ifnet *ifp)
883 {
884 struct ifmultiaddr *ifma;
885 struct ifmultiaddr *next;
886
887 IF_ADDR_WLOCK(ifp);
888 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next)
889 if_delmulti_locked(ifp, ifma, 1);
890 IF_ADDR_WUNLOCK(ifp);
891 }
892
893 /*
894 * Detach an interface, removing it from the list of "active" interfaces.
895 * If vmove flag is set on entry to if_detach_internal(), perform only a
896 * limited subset of cleanup tasks, given that we are moving an ifnet from
897 * one vnet to another, where it must be fully operational.
898 *
899 * XXXRW: There are some significant questions about event ordering, and
900 * how to prevent things from starting to use the interface during detach.
901 */
902 void
if_detach(struct ifnet * ifp)903 if_detach(struct ifnet *ifp)
904 {
905
906 CURVNET_SET_QUIET(ifp->if_vnet);
907 if_detach_internal(ifp, 0);
908 CURVNET_RESTORE();
909 }
910
911 static void
if_detach_internal(struct ifnet * ifp,int vmove)912 if_detach_internal(struct ifnet *ifp, int vmove)
913 {
914 struct ifaddr *ifa;
915 struct radix_node_head *rnh;
916 int i, j;
917 struct domain *dp;
918 struct ifnet *iter;
919 int found = 0;
920
921 IFNET_WLOCK();
922 TAILQ_FOREACH(iter, &V_ifnet, if_link)
923 if (iter == ifp) {
924 TAILQ_REMOVE(&V_ifnet, ifp, if_link);
925 found = 1;
926 break;
927 }
928 #ifdef VIMAGE
929 if (found)
930 curvnet->vnet_ifcnt--;
931 #endif
932 IFNET_WUNLOCK();
933 if (!found) {
934 if (vmove)
935 panic("%s: ifp=%p not on the ifnet tailq %p",
936 __func__, ifp, &V_ifnet);
937 else
938 return; /* XXX this should panic as well? */
939 }
940
941 /*
942 * Remove/wait for pending events.
943 */
944 taskqueue_drain(taskqueue_swi, &ifp->if_linktask);
945
946 /*
947 * Remove routes and flush queues.
948 */
949 if_down(ifp);
950 #ifdef ALTQ
951 if (ALTQ_IS_ENABLED(&ifp->if_snd))
952 altq_disable(&ifp->if_snd);
953 if (ALTQ_IS_ATTACHED(&ifp->if_snd))
954 altq_detach(&ifp->if_snd);
955 #endif
956
957 if_purgeaddrs(ifp);
958
959 #ifdef INET
960 in_ifdetach(ifp);
961 #endif
962
963 #ifdef INET6
964 /*
965 * Remove all IPv6 kernel structs related to ifp. This should be done
966 * before removing routing entries below, since IPv6 interface direct
967 * routes are expected to be removed by the IPv6-specific kernel API.
968 * Otherwise, the kernel will detect some inconsistency and bark it.
969 */
970 in6_ifdetach(ifp);
971 #endif
972 if_purgemaddrs(ifp);
973
974 if (!vmove) {
975 /*
976 * Prevent further calls into the device driver via ifnet.
977 */
978 if_dead(ifp);
979
980 /*
981 * Remove link ifaddr pointer and maybe decrement if_index.
982 * Clean up all addresses.
983 */
984 ifp->if_addr = NULL;
985
986 /* We can now free link ifaddr. */
987 if (!TAILQ_EMPTY(&ifp->if_addrhead)) {
988 ifa = TAILQ_FIRST(&ifp->if_addrhead);
989 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link);
990 ifa_free(ifa);
991 }
992 }
993
994 /*
995 * Delete all remaining routes using this interface
996 * Unfortuneatly the only way to do this is to slog through
997 * the entire routing table looking for routes which point
998 * to this interface...oh well...
999 */
1000 for (i = 1; i <= AF_MAX; i++) {
1001 for (j = 0; j < rt_numfibs; j++) {
1002 rnh = rt_tables_get_rnh(j, i);
1003 if (rnh == NULL)
1004 continue;
1005 RADIX_NODE_HEAD_LOCK(rnh);
1006 (void) rnh->rnh_walktree(rnh, if_rtdel, ifp);
1007 RADIX_NODE_HEAD_UNLOCK(rnh);
1008 }
1009 }
1010
1011 /* Announce that the interface is gone. */
1012 rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
1013 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp);
1014 if (IS_DEFAULT_VNET(curvnet))
1015 devctl_notify("IFNET", ifp->if_xname, "DETACH", NULL);
1016 if_delgroups(ifp);
1017
1018 /*
1019 * We cannot hold the lock over dom_ifdetach calls as they might
1020 * sleep, for example trying to drain a callout, thus open up the
1021 * theoretical race with re-attaching.
1022 */
1023 IF_AFDATA_LOCK(ifp);
1024 i = ifp->if_afdata_initialized;
1025 ifp->if_afdata_initialized = 0;
1026 IF_AFDATA_UNLOCK(ifp);
1027 for (dp = domains; i > 0 && dp; dp = dp->dom_next) {
1028 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family])
1029 (*dp->dom_ifdetach)(ifp,
1030 ifp->if_afdata[dp->dom_family]);
1031 }
1032 }
1033
1034 #ifdef VIMAGE
1035 /*
1036 * if_vmove() performs a limited version of if_detach() in current
1037 * vnet and if_attach()es the ifnet to the vnet specified as 2nd arg.
1038 * An attempt is made to shrink if_index in current vnet, find an
1039 * unused if_index in target vnet and calls if_grow() if necessary,
1040 * and finally find an unused if_xname for the target vnet.
1041 */
1042 void
if_vmove(struct ifnet * ifp,struct vnet * new_vnet)1043 if_vmove(struct ifnet *ifp, struct vnet *new_vnet)
1044 {
1045 u_short idx;
1046
1047 /*
1048 * Detach from current vnet, but preserve LLADDR info, do not
1049 * mark as dead etc. so that the ifnet can be reattached later.
1050 */
1051 if_detach_internal(ifp, 1);
1052
1053 /*
1054 * Unlink the ifnet from ifindex_table[] in current vnet, and shrink
1055 * the if_index for that vnet if possible.
1056 *
1057 * NOTE: IFNET_WLOCK/IFNET_WUNLOCK() are assumed to be unvirtualized,
1058 * or we'd lock on one vnet and unlock on another.
1059 */
1060 IFNET_WLOCK();
1061 ifindex_free_locked(ifp->if_index);
1062 IFNET_WUNLOCK();
1063
1064 /*
1065 * Perform interface-specific reassignment tasks, if provided by
1066 * the driver.
1067 */
1068 if (ifp->if_reassign != NULL)
1069 ifp->if_reassign(ifp, new_vnet, NULL);
1070
1071 /*
1072 * Switch to the context of the target vnet.
1073 */
1074 CURVNET_SET_QUIET(new_vnet);
1075
1076 IFNET_WLOCK();
1077 if (ifindex_alloc_locked(&idx) != 0) {
1078 IFNET_WUNLOCK();
1079 panic("if_index overflow");
1080 }
1081 ifp->if_index = idx;
1082 ifnet_setbyindex_locked(ifp->if_index, ifp);
1083 IFNET_WUNLOCK();
1084
1085 if_attach_internal(ifp, 1);
1086
1087 CURVNET_RESTORE();
1088 }
1089
1090 /*
1091 * Move an ifnet to or from another child prison/vnet, specified by the jail id.
1092 */
1093 static int
if_vmove_loan(struct thread * td,struct ifnet * ifp,char * ifname,int jid)1094 if_vmove_loan(struct thread *td, struct ifnet *ifp, char *ifname, int jid)
1095 {
1096 struct prison *pr;
1097 struct ifnet *difp;
1098
1099 /* Try to find the prison within our visibility. */
1100 sx_slock(&allprison_lock);
1101 pr = prison_find_child(td->td_ucred->cr_prison, jid);
1102 sx_sunlock(&allprison_lock);
1103 if (pr == NULL)
1104 return (ENXIO);
1105 prison_hold_locked(pr);
1106 mtx_unlock(&pr->pr_mtx);
1107
1108 /* Do not try to move the iface from and to the same prison. */
1109 if (pr->pr_vnet == ifp->if_vnet) {
1110 prison_free(pr);
1111 return (EEXIST);
1112 }
1113
1114 /* Make sure the named iface does not exists in the dst. prison/vnet. */
1115 /* XXX Lock interfaces to avoid races. */
1116 CURVNET_SET_QUIET(pr->pr_vnet);
1117 difp = ifunit(ifname);
1118 CURVNET_RESTORE();
1119 if (difp != NULL) {
1120 prison_free(pr);
1121 return (EEXIST);
1122 }
1123
1124 /* Move the interface into the child jail/vnet. */
1125 if_vmove(ifp, pr->pr_vnet);
1126
1127 /* Report the new if_xname back to the userland. */
1128 sprintf(ifname, "%s", ifp->if_xname);
1129
1130 prison_free(pr);
1131 return (0);
1132 }
1133
1134 static int
if_vmove_reclaim(struct thread * td,char * ifname,int jid)1135 if_vmove_reclaim(struct thread *td, char *ifname, int jid)
1136 {
1137 struct prison *pr;
1138 struct vnet *vnet_dst;
1139 struct ifnet *ifp;
1140
1141 /* Try to find the prison within our visibility. */
1142 sx_slock(&allprison_lock);
1143 pr = prison_find_child(td->td_ucred->cr_prison, jid);
1144 sx_sunlock(&allprison_lock);
1145 if (pr == NULL)
1146 return (ENXIO);
1147 prison_hold_locked(pr);
1148 mtx_unlock(&pr->pr_mtx);
1149
1150 /* Make sure the named iface exists in the source prison/vnet. */
1151 CURVNET_SET(pr->pr_vnet);
1152 ifp = ifunit(ifname); /* XXX Lock to avoid races. */
1153 if (ifp == NULL) {
1154 CURVNET_RESTORE();
1155 prison_free(pr);
1156 return (ENXIO);
1157 }
1158
1159 /* Do not try to move the iface from and to the same prison. */
1160 vnet_dst = TD_TO_VNET(td);
1161 if (vnet_dst == ifp->if_vnet) {
1162 CURVNET_RESTORE();
1163 prison_free(pr);
1164 return (EEXIST);
1165 }
1166
1167 /* Get interface back from child jail/vnet. */
1168 if_vmove(ifp, vnet_dst);
1169 CURVNET_RESTORE();
1170
1171 /* Report the new if_xname back to the userland. */
1172 sprintf(ifname, "%s", ifp->if_xname);
1173
1174 prison_free(pr);
1175 return (0);
1176 }
1177 #endif /* VIMAGE */
1178
1179 /*
1180 * Add a group to an interface
1181 */
1182 int
if_addgroup(struct ifnet * ifp,const char * groupname)1183 if_addgroup(struct ifnet *ifp, const char *groupname)
1184 {
1185 struct ifg_list *ifgl;
1186 struct ifg_group *ifg = NULL;
1187 struct ifg_member *ifgm;
1188
1189 if (groupname[0] && groupname[strlen(groupname) - 1] >= '0' &&
1190 groupname[strlen(groupname) - 1] <= '9')
1191 return (EINVAL);
1192
1193 IFNET_WLOCK();
1194 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next)
1195 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) {
1196 IFNET_WUNLOCK();
1197 return (EEXIST);
1198 }
1199
1200 if ((ifgl = (struct ifg_list *)malloc(sizeof(struct ifg_list), M_TEMP,
1201 M_NOWAIT)) == NULL) {
1202 IFNET_WUNLOCK();
1203 return (ENOMEM);
1204 }
1205
1206 if ((ifgm = (struct ifg_member *)malloc(sizeof(struct ifg_member),
1207 M_TEMP, M_NOWAIT)) == NULL) {
1208 free(ifgl, M_TEMP);
1209 IFNET_WUNLOCK();
1210 return (ENOMEM);
1211 }
1212
1213 TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next)
1214 if (!strcmp(ifg->ifg_group, groupname))
1215 break;
1216
1217 if (ifg == NULL) {
1218 if ((ifg = (struct ifg_group *)malloc(sizeof(struct ifg_group),
1219 M_TEMP, M_NOWAIT)) == NULL) {
1220 free(ifgl, M_TEMP);
1221 free(ifgm, M_TEMP);
1222 IFNET_WUNLOCK();
1223 return (ENOMEM);
1224 }
1225 strlcpy(ifg->ifg_group, groupname, sizeof(ifg->ifg_group));
1226 ifg->ifg_refcnt = 0;
1227 TAILQ_INIT(&ifg->ifg_members);
1228 EVENTHANDLER_INVOKE(group_attach_event, ifg);
1229 TAILQ_INSERT_TAIL(&V_ifg_head, ifg, ifg_next);
1230 }
1231
1232 ifg->ifg_refcnt++;
1233 ifgl->ifgl_group = ifg;
1234 ifgm->ifgm_ifp = ifp;
1235
1236 IF_ADDR_WLOCK(ifp);
1237 TAILQ_INSERT_TAIL(&ifg->ifg_members, ifgm, ifgm_next);
1238 TAILQ_INSERT_TAIL(&ifp->if_groups, ifgl, ifgl_next);
1239 IF_ADDR_WUNLOCK(ifp);
1240
1241 IFNET_WUNLOCK();
1242
1243 EVENTHANDLER_INVOKE(group_change_event, groupname);
1244
1245 return (0);
1246 }
1247
1248 /*
1249 * Remove a group from an interface
1250 */
1251 int
if_delgroup(struct ifnet * ifp,const char * groupname)1252 if_delgroup(struct ifnet *ifp, const char *groupname)
1253 {
1254 struct ifg_list *ifgl;
1255 struct ifg_member *ifgm;
1256
1257 IFNET_WLOCK();
1258 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next)
1259 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname))
1260 break;
1261 if (ifgl == NULL) {
1262 IFNET_WUNLOCK();
1263 return (ENOENT);
1264 }
1265
1266 IF_ADDR_WLOCK(ifp);
1267 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next);
1268 IF_ADDR_WUNLOCK(ifp);
1269
1270 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next)
1271 if (ifgm->ifgm_ifp == ifp)
1272 break;
1273
1274 if (ifgm != NULL) {
1275 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, ifgm_next);
1276 free(ifgm, M_TEMP);
1277 }
1278
1279 if (--ifgl->ifgl_group->ifg_refcnt == 0) {
1280 TAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_next);
1281 EVENTHANDLER_INVOKE(group_detach_event, ifgl->ifgl_group);
1282 free(ifgl->ifgl_group, M_TEMP);
1283 }
1284 IFNET_WUNLOCK();
1285
1286 free(ifgl, M_TEMP);
1287
1288 EVENTHANDLER_INVOKE(group_change_event, groupname);
1289
1290 return (0);
1291 }
1292
1293 /*
1294 * Remove an interface from all groups
1295 */
1296 static void
if_delgroups(struct ifnet * ifp)1297 if_delgroups(struct ifnet *ifp)
1298 {
1299 struct ifg_list *ifgl;
1300 struct ifg_member *ifgm;
1301 char groupname[IFNAMSIZ];
1302
1303 IFNET_WLOCK();
1304 while (!TAILQ_EMPTY(&ifp->if_groups)) {
1305 ifgl = TAILQ_FIRST(&ifp->if_groups);
1306
1307 strlcpy(groupname, ifgl->ifgl_group->ifg_group, IFNAMSIZ);
1308
1309 IF_ADDR_WLOCK(ifp);
1310 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next);
1311 IF_ADDR_WUNLOCK(ifp);
1312
1313 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next)
1314 if (ifgm->ifgm_ifp == ifp)
1315 break;
1316
1317 if (ifgm != NULL) {
1318 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm,
1319 ifgm_next);
1320 free(ifgm, M_TEMP);
1321 }
1322
1323 if (--ifgl->ifgl_group->ifg_refcnt == 0) {
1324 TAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_next);
1325 EVENTHANDLER_INVOKE(group_detach_event,
1326 ifgl->ifgl_group);
1327 free(ifgl->ifgl_group, M_TEMP);
1328 }
1329 IFNET_WUNLOCK();
1330
1331 free(ifgl, M_TEMP);
1332
1333 EVENTHANDLER_INVOKE(group_change_event, groupname);
1334
1335 IFNET_WLOCK();
1336 }
1337 IFNET_WUNLOCK();
1338 }
1339
1340 /*
1341 * Stores all groups from an interface in memory pointed
1342 * to by data
1343 */
1344 static int
if_getgroup(struct ifgroupreq * data,struct ifnet * ifp)1345 if_getgroup(struct ifgroupreq *data, struct ifnet *ifp)
1346 {
1347 int len, error;
1348 struct ifg_list *ifgl;
1349 struct ifg_req ifgrq, *ifgp;
1350 struct ifgroupreq *ifgr = data;
1351
1352 if (ifgr->ifgr_len == 0) {
1353 IF_ADDR_RLOCK(ifp);
1354 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next)
1355 ifgr->ifgr_len += sizeof(struct ifg_req);
1356 IF_ADDR_RUNLOCK(ifp);
1357 return (0);
1358 }
1359
1360 len = ifgr->ifgr_len;
1361 ifgp = ifgr->ifgr_groups;
1362 /* XXX: wire */
1363 IF_ADDR_RLOCK(ifp);
1364 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) {
1365 if (len < sizeof(ifgrq)) {
1366 IF_ADDR_RUNLOCK(ifp);
1367 return (EINVAL);
1368 }
1369 bzero(&ifgrq, sizeof ifgrq);
1370 strlcpy(ifgrq.ifgrq_group, ifgl->ifgl_group->ifg_group,
1371 sizeof(ifgrq.ifgrq_group));
1372 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) {
1373 IF_ADDR_RUNLOCK(ifp);
1374 return (error);
1375 }
1376 len -= sizeof(ifgrq);
1377 ifgp++;
1378 }
1379 IF_ADDR_RUNLOCK(ifp);
1380
1381 return (0);
1382 }
1383
1384 /*
1385 * Stores all members of a group in memory pointed to by data
1386 */
1387 static int
if_getgroupmembers(struct ifgroupreq * data)1388 if_getgroupmembers(struct ifgroupreq *data)
1389 {
1390 struct ifgroupreq *ifgr = data;
1391 struct ifg_group *ifg;
1392 struct ifg_member *ifgm;
1393 struct ifg_req ifgrq, *ifgp;
1394 int len, error;
1395
1396 IFNET_RLOCK();
1397 TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next)
1398 if (!strcmp(ifg->ifg_group, ifgr->ifgr_name))
1399 break;
1400 if (ifg == NULL) {
1401 IFNET_RUNLOCK();
1402 return (ENOENT);
1403 }
1404
1405 if (ifgr->ifgr_len == 0) {
1406 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next)
1407 ifgr->ifgr_len += sizeof(ifgrq);
1408 IFNET_RUNLOCK();
1409 return (0);
1410 }
1411
1412 len = ifgr->ifgr_len;
1413 ifgp = ifgr->ifgr_groups;
1414 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) {
1415 if (len < sizeof(ifgrq)) {
1416 IFNET_RUNLOCK();
1417 return (EINVAL);
1418 }
1419 bzero(&ifgrq, sizeof ifgrq);
1420 strlcpy(ifgrq.ifgrq_member, ifgm->ifgm_ifp->if_xname,
1421 sizeof(ifgrq.ifgrq_member));
1422 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) {
1423 IFNET_RUNLOCK();
1424 return (error);
1425 }
1426 len -= sizeof(ifgrq);
1427 ifgp++;
1428 }
1429 IFNET_RUNLOCK();
1430
1431 return (0);
1432 }
1433
1434 /*
1435 * Delete Routes for a Network Interface
1436 *
1437 * Called for each routing entry via the rnh->rnh_walktree() call above
1438 * to delete all route entries referencing a detaching network interface.
1439 *
1440 * Arguments:
1441 * rn pointer to node in the routing table
1442 * arg argument passed to rnh->rnh_walktree() - detaching interface
1443 *
1444 * Returns:
1445 * 0 successful
1446 * errno failed - reason indicated
1447 *
1448 */
1449 static int
if_rtdel(struct radix_node * rn,void * arg)1450 if_rtdel(struct radix_node *rn, void *arg)
1451 {
1452 struct rtentry *rt = (struct rtentry *)rn;
1453 struct ifnet *ifp = arg;
1454 int err;
1455
1456 if (rt->rt_ifp == ifp) {
1457
1458 /*
1459 * Protect (sorta) against walktree recursion problems
1460 * with cloned routes
1461 */
1462 if ((rt->rt_flags & RTF_UP) == 0)
1463 return (0);
1464
1465 err = rtrequest_fib(RTM_DELETE, rt_key(rt), rt->rt_gateway,
1466 rt_mask(rt),
1467 rt->rt_flags|RTF_RNH_LOCKED|RTF_PINNED,
1468 (struct rtentry **) NULL, rt->rt_fibnum);
1469 if (err) {
1470 log(LOG_WARNING, "if_rtdel: error %d\n", err);
1471 }
1472 }
1473
1474 return (0);
1475 }
1476
1477 /*
1478 * Wrapper functions for struct ifnet address list locking macros. These are
1479 * used by kernel modules to avoid encoding programming interface or binary
1480 * interface assumptions that may be violated when kernel-internal locking
1481 * approaches change.
1482 */
1483 void
if_addr_rlock(struct ifnet * ifp)1484 if_addr_rlock(struct ifnet *ifp)
1485 {
1486
1487 IF_ADDR_RLOCK(ifp);
1488 }
1489
1490 void
if_addr_runlock(struct ifnet * ifp)1491 if_addr_runlock(struct ifnet *ifp)
1492 {
1493
1494 IF_ADDR_RUNLOCK(ifp);
1495 }
1496
1497 void
if_maddr_rlock(struct ifnet * ifp)1498 if_maddr_rlock(struct ifnet *ifp)
1499 {
1500
1501 IF_ADDR_RLOCK(ifp);
1502 }
1503
1504 void
if_maddr_runlock(struct ifnet * ifp)1505 if_maddr_runlock(struct ifnet *ifp)
1506 {
1507
1508 IF_ADDR_RUNLOCK(ifp);
1509 }
1510
1511 /*
1512 * Reference count functions for ifaddrs.
1513 */
1514 void
ifa_init(struct ifaddr * ifa)1515 ifa_init(struct ifaddr *ifa)
1516 {
1517
1518 mtx_init(&ifa->ifa_mtx, "ifaddr", NULL, MTX_DEF);
1519 refcount_init(&ifa->ifa_refcnt, 1);
1520 }
1521
1522 void
ifa_ref(struct ifaddr * ifa)1523 ifa_ref(struct ifaddr *ifa)
1524 {
1525
1526 refcount_acquire(&ifa->ifa_refcnt);
1527 }
1528
1529 void
ifa_free(struct ifaddr * ifa)1530 ifa_free(struct ifaddr *ifa)
1531 {
1532
1533 if (refcount_release(&ifa->ifa_refcnt)) {
1534 mtx_destroy(&ifa->ifa_mtx);
1535 free(ifa, M_IFADDR);
1536 }
1537 }
1538
1539 int
ifa_add_loopback_route(struct ifaddr * ifa,struct sockaddr * ia)1540 ifa_add_loopback_route(struct ifaddr *ifa, struct sockaddr *ia)
1541 {
1542 int error = 0;
1543 struct rtentry *rt = NULL;
1544 struct rt_addrinfo info;
1545 static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK};
1546
1547 bzero(&info, sizeof(info));
1548 info.rti_ifp = V_loif;
1549 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC;
1550 info.rti_info[RTAX_DST] = ia;
1551 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl;
1552 error = rtrequest1_fib(RTM_ADD, &info, &rt, ifa->ifa_ifp->if_fib);
1553
1554 if (error == 0 && rt != NULL) {
1555 RT_LOCK(rt);
1556 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_type =
1557 ifa->ifa_ifp->if_type;
1558 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_index =
1559 ifa->ifa_ifp->if_index;
1560 RT_REMREF(rt);
1561 RT_UNLOCK(rt);
1562 } else if (error != 0)
1563 log(LOG_INFO, "ifa_add_loopback_route: insertion failed\n");
1564
1565 return (error);
1566 }
1567
1568 int
ifa_del_loopback_route(struct ifaddr * ifa,struct sockaddr * ia)1569 ifa_del_loopback_route(struct ifaddr *ifa, struct sockaddr *ia)
1570 {
1571 int error = 0;
1572 struct rt_addrinfo info;
1573 struct sockaddr_dl null_sdl;
1574
1575 bzero(&null_sdl, sizeof(null_sdl));
1576 null_sdl.sdl_len = sizeof(null_sdl);
1577 null_sdl.sdl_family = AF_LINK;
1578 null_sdl.sdl_type = ifa->ifa_ifp->if_type;
1579 null_sdl.sdl_index = ifa->ifa_ifp->if_index;
1580 bzero(&info, sizeof(info));
1581 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC;
1582 info.rti_info[RTAX_DST] = ia;
1583 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl;
1584 error = rtrequest1_fib(RTM_DELETE, &info, NULL, ifa->ifa_ifp->if_fib);
1585
1586 if (error != 0)
1587 log(LOG_INFO, "ifa_del_loopback_route: deletion failed\n");
1588
1589 return (error);
1590 }
1591
1592 /*
1593 * XXX: Because sockaddr_dl has deeper structure than the sockaddr
1594 * structs used to represent other address families, it is necessary
1595 * to perform a different comparison.
1596 */
1597
1598 #define sa_equal(a1, a2) \
1599 (bcmp((a1), (a2), ((a1))->sa_len) == 0)
1600
1601 #define sa_dl_equal(a1, a2) \
1602 ((((struct sockaddr_dl *)(a1))->sdl_len == \
1603 ((struct sockaddr_dl *)(a2))->sdl_len) && \
1604 (bcmp(LLADDR((struct sockaddr_dl *)(a1)), \
1605 LLADDR((struct sockaddr_dl *)(a2)), \
1606 ((struct sockaddr_dl *)(a1))->sdl_alen) == 0))
1607
1608 /*
1609 * Locate an interface based on a complete address.
1610 */
1611 /*ARGSUSED*/
1612 static struct ifaddr *
ifa_ifwithaddr_internal(struct sockaddr * addr,int getref)1613 ifa_ifwithaddr_internal(struct sockaddr *addr, int getref)
1614 {
1615 struct ifnet *ifp;
1616 struct ifaddr *ifa;
1617
1618 IFNET_RLOCK_NOSLEEP();
1619 TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1620 IF_ADDR_RLOCK(ifp);
1621 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1622 if (ifa->ifa_addr->sa_family != addr->sa_family)
1623 continue;
1624 if (sa_equal(addr, ifa->ifa_addr)) {
1625 if (getref)
1626 ifa_ref(ifa);
1627 IF_ADDR_RUNLOCK(ifp);
1628 goto done;
1629 }
1630 /* IP6 doesn't have broadcast */
1631 if ((ifp->if_flags & IFF_BROADCAST) &&
1632 ifa->ifa_broadaddr &&
1633 ifa->ifa_broadaddr->sa_len != 0 &&
1634 sa_equal(ifa->ifa_broadaddr, addr)) {
1635 if (getref)
1636 ifa_ref(ifa);
1637 IF_ADDR_RUNLOCK(ifp);
1638 goto done;
1639 }
1640 }
1641 IF_ADDR_RUNLOCK(ifp);
1642 }
1643 ifa = NULL;
1644 done:
1645 IFNET_RUNLOCK_NOSLEEP();
1646 return (ifa);
1647 }
1648
1649 struct ifaddr *
ifa_ifwithaddr(struct sockaddr * addr)1650 ifa_ifwithaddr(struct sockaddr *addr)
1651 {
1652
1653 return (ifa_ifwithaddr_internal(addr, 1));
1654 }
1655
1656 int
ifa_ifwithaddr_check(struct sockaddr * addr)1657 ifa_ifwithaddr_check(struct sockaddr *addr)
1658 {
1659
1660 return (ifa_ifwithaddr_internal(addr, 0) != NULL);
1661 }
1662
1663 /*
1664 * Locate an interface based on the broadcast address.
1665 */
1666 /* ARGSUSED */
1667 struct ifaddr *
ifa_ifwithbroadaddr(struct sockaddr * addr)1668 ifa_ifwithbroadaddr(struct sockaddr *addr)
1669 {
1670 struct ifnet *ifp;
1671 struct ifaddr *ifa;
1672
1673 IFNET_RLOCK_NOSLEEP();
1674 TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1675 IF_ADDR_RLOCK(ifp);
1676 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1677 if (ifa->ifa_addr->sa_family != addr->sa_family)
1678 continue;
1679 if ((ifp->if_flags & IFF_BROADCAST) &&
1680 ifa->ifa_broadaddr &&
1681 ifa->ifa_broadaddr->sa_len != 0 &&
1682 sa_equal(ifa->ifa_broadaddr, addr)) {
1683 ifa_ref(ifa);
1684 IF_ADDR_RUNLOCK(ifp);
1685 goto done;
1686 }
1687 }
1688 IF_ADDR_RUNLOCK(ifp);
1689 }
1690 ifa = NULL;
1691 done:
1692 IFNET_RUNLOCK_NOSLEEP();
1693 return (ifa);
1694 }
1695
1696 /*
1697 * Locate the point to point interface with a given destination address.
1698 */
1699 /*ARGSUSED*/
1700 struct ifaddr *
ifa_ifwithdstaddr_fib(struct sockaddr * addr,int fibnum)1701 ifa_ifwithdstaddr_fib(struct sockaddr *addr, int fibnum)
1702 {
1703 struct ifnet *ifp;
1704 struct ifaddr *ifa;
1705
1706 IFNET_RLOCK_NOSLEEP();
1707 TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1708 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
1709 continue;
1710 if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum))
1711 continue;
1712 IF_ADDR_RLOCK(ifp);
1713 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1714 if (ifa->ifa_addr->sa_family != addr->sa_family)
1715 continue;
1716 if (ifa->ifa_dstaddr != NULL &&
1717 sa_equal(addr, ifa->ifa_dstaddr)) {
1718 ifa_ref(ifa);
1719 IF_ADDR_RUNLOCK(ifp);
1720 goto done;
1721 }
1722 }
1723 IF_ADDR_RUNLOCK(ifp);
1724 }
1725 ifa = NULL;
1726 done:
1727 IFNET_RUNLOCK_NOSLEEP();
1728 return (ifa);
1729 }
1730
1731 struct ifaddr *
ifa_ifwithdstaddr(struct sockaddr * addr)1732 ifa_ifwithdstaddr(struct sockaddr *addr)
1733 {
1734
1735 return (ifa_ifwithdstaddr_fib(addr, RT_ALL_FIBS));
1736 }
1737
1738 /*
1739 * Find an interface on a specific network. If many, choice
1740 * is most specific found.
1741 */
1742 struct ifaddr *
ifa_ifwithnet_fib(struct sockaddr * addr,int ignore_ptp,int fibnum)1743 ifa_ifwithnet_fib(struct sockaddr *addr, int ignore_ptp, int fibnum)
1744 {
1745 struct ifnet *ifp;
1746 struct ifaddr *ifa;
1747 struct ifaddr *ifa_maybe = NULL;
1748 u_int af = addr->sa_family;
1749 char *addr_data = addr->sa_data, *cplim;
1750
1751 /*
1752 * AF_LINK addresses can be looked up directly by their index number,
1753 * so do that if we can.
1754 */
1755 if (af == AF_LINK) {
1756 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr;
1757 if (sdl->sdl_index && sdl->sdl_index <= V_if_index)
1758 return (ifaddr_byindex(sdl->sdl_index));
1759 }
1760
1761 /*
1762 * Scan though each interface, looking for ones that have addresses
1763 * in this address family and the requested fib. Maintain a reference
1764 * on ifa_maybe once we find one, as we release the IF_ADDR_RLOCK() that
1765 * kept it stable when we move onto the next interface.
1766 */
1767 IFNET_RLOCK_NOSLEEP();
1768 TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1769 if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum))
1770 continue;
1771 IF_ADDR_RLOCK(ifp);
1772 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1773 char *cp, *cp2, *cp3;
1774
1775 if (ifa->ifa_addr->sa_family != af)
1776 next: continue;
1777 if (af == AF_INET &&
1778 ifp->if_flags & IFF_POINTOPOINT && !ignore_ptp) {
1779 /*
1780 * This is a bit broken as it doesn't
1781 * take into account that the remote end may
1782 * be a single node in the network we are
1783 * looking for.
1784 * The trouble is that we don't know the
1785 * netmask for the remote end.
1786 */
1787 if (ifa->ifa_dstaddr != NULL &&
1788 sa_equal(addr, ifa->ifa_dstaddr)) {
1789 ifa_ref(ifa);
1790 IF_ADDR_RUNLOCK(ifp);
1791 goto done;
1792 }
1793 } else {
1794 /*
1795 * if we have a special address handler,
1796 * then use it instead of the generic one.
1797 */
1798 if (ifa->ifa_claim_addr) {
1799 if ((*ifa->ifa_claim_addr)(ifa, addr)) {
1800 ifa_ref(ifa);
1801 IF_ADDR_RUNLOCK(ifp);
1802 goto done;
1803 }
1804 continue;
1805 }
1806
1807 /*
1808 * Scan all the bits in the ifa's address.
1809 * If a bit dissagrees with what we are
1810 * looking for, mask it with the netmask
1811 * to see if it really matters.
1812 * (A byte at a time)
1813 */
1814 if (ifa->ifa_netmask == 0)
1815 continue;
1816 cp = addr_data;
1817 cp2 = ifa->ifa_addr->sa_data;
1818 cp3 = ifa->ifa_netmask->sa_data;
1819 cplim = ifa->ifa_netmask->sa_len
1820 + (char *)ifa->ifa_netmask;
1821 while (cp3 < cplim)
1822 if ((*cp++ ^ *cp2++) & *cp3++)
1823 goto next; /* next address! */
1824 /*
1825 * If the netmask of what we just found
1826 * is more specific than what we had before
1827 * (if we had one) then remember the new one
1828 * before continuing to search
1829 * for an even better one.
1830 */
1831 if (ifa_maybe == NULL ||
1832 rn_refines((caddr_t)ifa->ifa_netmask,
1833 (caddr_t)ifa_maybe->ifa_netmask)) {
1834 if (ifa_maybe != NULL)
1835 ifa_free(ifa_maybe);
1836 ifa_maybe = ifa;
1837 ifa_ref(ifa_maybe);
1838 }
1839 }
1840 }
1841 IF_ADDR_RUNLOCK(ifp);
1842 }
1843 ifa = ifa_maybe;
1844 ifa_maybe = NULL;
1845 done:
1846 IFNET_RUNLOCK_NOSLEEP();
1847 if (ifa_maybe != NULL)
1848 ifa_free(ifa_maybe);
1849 return (ifa);
1850 }
1851
1852 struct ifaddr *
ifa_ifwithnet(struct sockaddr * addr,int ignore_ptp)1853 ifa_ifwithnet(struct sockaddr *addr, int ignore_ptp)
1854 {
1855
1856 return (ifa_ifwithnet_fib(addr, ignore_ptp, RT_ALL_FIBS));
1857 }
1858
1859 /*
1860 * Find an interface address specific to an interface best matching
1861 * a given address.
1862 */
1863 struct ifaddr *
ifaof_ifpforaddr(struct sockaddr * addr,struct ifnet * ifp)1864 ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp)
1865 {
1866 struct ifaddr *ifa;
1867 char *cp, *cp2, *cp3;
1868 char *cplim;
1869 struct ifaddr *ifa_maybe = NULL;
1870 u_int af = addr->sa_family;
1871
1872 if (af >= AF_MAX)
1873 return (NULL);
1874 IF_ADDR_RLOCK(ifp);
1875 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1876 if (ifa->ifa_addr->sa_family != af)
1877 continue;
1878 if (ifa_maybe == NULL)
1879 ifa_maybe = ifa;
1880 if (ifa->ifa_netmask == 0) {
1881 if (sa_equal(addr, ifa->ifa_addr) ||
1882 (ifa->ifa_dstaddr &&
1883 sa_equal(addr, ifa->ifa_dstaddr)))
1884 goto done;
1885 continue;
1886 }
1887 if (ifp->if_flags & IFF_POINTOPOINT) {
1888 if (sa_equal(addr, ifa->ifa_dstaddr))
1889 goto done;
1890 } else {
1891 cp = addr->sa_data;
1892 cp2 = ifa->ifa_addr->sa_data;
1893 cp3 = ifa->ifa_netmask->sa_data;
1894 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask;
1895 for (; cp3 < cplim; cp3++)
1896 if ((*cp++ ^ *cp2++) & *cp3)
1897 break;
1898 if (cp3 == cplim)
1899 goto done;
1900 }
1901 }
1902 ifa = ifa_maybe;
1903 done:
1904 if (ifa != NULL)
1905 ifa_ref(ifa);
1906 IF_ADDR_RUNLOCK(ifp);
1907 return (ifa);
1908 }
1909
1910 #include <net/if_llatbl.h>
1911
1912 /*
1913 * Default action when installing a route with a Link Level gateway.
1914 * Lookup an appropriate real ifa to point to.
1915 * This should be moved to /sys/net/link.c eventually.
1916 */
1917 static void
link_rtrequest(int cmd,struct rtentry * rt,struct rt_addrinfo * info)1918 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info)
1919 {
1920 struct ifaddr *ifa, *oifa;
1921 struct sockaddr *dst;
1922 struct ifnet *ifp;
1923
1924 RT_LOCK_ASSERT(rt);
1925
1926 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) ||
1927 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0))
1928 return;
1929 ifa = ifaof_ifpforaddr(dst, ifp);
1930 if (ifa) {
1931 oifa = rt->rt_ifa;
1932 rt->rt_ifa = ifa;
1933 ifa_free(oifa);
1934 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest)
1935 ifa->ifa_rtrequest(cmd, rt, info);
1936 }
1937 }
1938
1939 /*
1940 * Mark an interface down and notify protocols of
1941 * the transition.
1942 * NOTE: must be called at splnet or eqivalent.
1943 */
1944 static void
if_unroute(struct ifnet * ifp,int flag,int fam)1945 if_unroute(struct ifnet *ifp, int flag, int fam)
1946 {
1947 struct ifaddr *ifa;
1948
1949 KASSERT(flag == IFF_UP, ("if_unroute: flag != IFF_UP"));
1950
1951 ifp->if_flags &= ~flag;
1952 getmicrotime(&ifp->if_lastchange);
1953 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
1954 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family))
1955 pfctlinput(PRC_IFDOWN, ifa->ifa_addr);
1956 ifp->if_qflush(ifp);
1957
1958 if (ifp->if_carp)
1959 (*carp_linkstate_p)(ifp);
1960 rt_ifmsg(ifp);
1961 }
1962
1963 /*
1964 * Mark an interface up and notify protocols of
1965 * the transition.
1966 * NOTE: must be called at splnet or eqivalent.
1967 */
1968 static void
if_route(struct ifnet * ifp,int flag,int fam)1969 if_route(struct ifnet *ifp, int flag, int fam)
1970 {
1971 struct ifaddr *ifa;
1972
1973 KASSERT(flag == IFF_UP, ("if_route: flag != IFF_UP"));
1974
1975 ifp->if_flags |= flag;
1976 getmicrotime(&ifp->if_lastchange);
1977 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
1978 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family))
1979 pfctlinput(PRC_IFUP, ifa->ifa_addr);
1980 if (ifp->if_carp)
1981 (*carp_linkstate_p)(ifp);
1982 rt_ifmsg(ifp);
1983 #ifdef INET6
1984 in6_if_up(ifp);
1985 #endif
1986 }
1987
1988 void (*vlan_link_state_p)(struct ifnet *); /* XXX: private from if_vlan */
1989 void (*vlan_trunk_cap_p)(struct ifnet *); /* XXX: private from if_vlan */
1990 struct ifnet *(*vlan_trunkdev_p)(struct ifnet *);
1991 struct ifnet *(*vlan_devat_p)(struct ifnet *, uint16_t);
1992 int (*vlan_tag_p)(struct ifnet *, uint16_t *);
1993 int (*vlan_setcookie_p)(struct ifnet *, void *);
1994 void *(*vlan_cookie_p)(struct ifnet *);
1995
1996 /*
1997 * Handle a change in the interface link state. To avoid LORs
1998 * between driver lock and upper layer locks, as well as possible
1999 * recursions, we post event to taskqueue, and all job
2000 * is done in static do_link_state_change().
2001 */
2002 void
if_link_state_change(struct ifnet * ifp,int link_state)2003 if_link_state_change(struct ifnet *ifp, int link_state)
2004 {
2005 /* Return if state hasn't changed. */
2006 if (ifp->if_link_state == link_state)
2007 return;
2008
2009 ifp->if_link_state = link_state;
2010
2011 taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask);
2012 }
2013
2014 static void
do_link_state_change(void * arg,int pending)2015 do_link_state_change(void *arg, int pending)
2016 {
2017 struct ifnet *ifp = (struct ifnet *)arg;
2018 int link_state = ifp->if_link_state;
2019 CURVNET_SET(ifp->if_vnet);
2020
2021 /* Notify that the link state has changed. */
2022 rt_ifmsg(ifp);
2023 if (ifp->if_vlantrunk != NULL)
2024 (*vlan_link_state_p)(ifp);
2025
2026 if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) &&
2027 IFP2AC(ifp)->ac_netgraph != NULL)
2028 (*ng_ether_link_state_p)(ifp, link_state);
2029 if (ifp->if_carp)
2030 (*carp_linkstate_p)(ifp);
2031 if (ifp->if_bridge)
2032 (*bridge_linkstate_p)(ifp);
2033 if (ifp->if_lagg)
2034 (*lagg_linkstate_p)(ifp, link_state);
2035
2036 if (IS_DEFAULT_VNET(curvnet))
2037 devctl_notify("IFNET", ifp->if_xname,
2038 (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN",
2039 NULL);
2040 if (pending > 1)
2041 if_printf(ifp, "%d link states coalesced\n", pending);
2042 if (log_link_state_change)
2043 log(LOG_NOTICE, "%s: link state changed to %s\n", ifp->if_xname,
2044 (link_state == LINK_STATE_UP) ? "UP" : "DOWN" );
2045 EVENTHANDLER_INVOKE(ifnet_link_event, ifp, ifp->if_link_state);
2046 CURVNET_RESTORE();
2047 }
2048
2049 /*
2050 * Mark an interface down and notify protocols of
2051 * the transition.
2052 * NOTE: must be called at splnet or eqivalent.
2053 */
2054 void
if_down(struct ifnet * ifp)2055 if_down(struct ifnet *ifp)
2056 {
2057
2058 if_unroute(ifp, IFF_UP, AF_UNSPEC);
2059 }
2060
2061 /*
2062 * Mark an interface up and notify protocols of
2063 * the transition.
2064 * NOTE: must be called at splnet or eqivalent.
2065 */
2066 void
if_up(struct ifnet * ifp)2067 if_up(struct ifnet *ifp)
2068 {
2069
2070 if_route(ifp, IFF_UP, AF_UNSPEC);
2071 }
2072
2073 /*
2074 * Flush an interface queue.
2075 */
2076 void
if_qflush(struct ifnet * ifp)2077 if_qflush(struct ifnet *ifp)
2078 {
2079 struct mbuf *m, *n;
2080 struct ifaltq *ifq;
2081
2082 ifq = &ifp->if_snd;
2083 IFQ_LOCK(ifq);
2084 #ifdef ALTQ
2085 if (ALTQ_IS_ENABLED(ifq))
2086 ALTQ_PURGE(ifq);
2087 #endif
2088 n = ifq->ifq_head;
2089 while ((m = n) != 0) {
2090 n = m->m_act;
2091 m_freem(m);
2092 }
2093 ifq->ifq_head = 0;
2094 ifq->ifq_tail = 0;
2095 ifq->ifq_len = 0;
2096 IFQ_UNLOCK(ifq);
2097 }
2098
2099 /*
2100 * Map interface name to interface structure pointer, with or without
2101 * returning a reference.
2102 */
2103 struct ifnet *
ifunit_ref(const char * name)2104 ifunit_ref(const char *name)
2105 {
2106 struct ifnet *ifp;
2107
2108 IFNET_RLOCK_NOSLEEP();
2109 TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
2110 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0 &&
2111 !(ifp->if_flags & IFF_DYING))
2112 break;
2113 }
2114 if (ifp != NULL)
2115 if_ref(ifp);
2116 IFNET_RUNLOCK_NOSLEEP();
2117 return (ifp);
2118 }
2119
2120 struct ifnet *
ifunit(const char * name)2121 ifunit(const char *name)
2122 {
2123 struct ifnet *ifp;
2124
2125 IFNET_RLOCK_NOSLEEP();
2126 TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
2127 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0)
2128 break;
2129 }
2130 IFNET_RUNLOCK_NOSLEEP();
2131 return (ifp);
2132 }
2133
2134 /*
2135 * Hardware specific interface ioctls.
2136 */
2137 static int
ifhwioctl(u_long cmd,struct ifnet * ifp,caddr_t data,struct thread * td)2138 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td)
2139 {
2140 struct ifreq *ifr;
2141 struct ifstat *ifs;
2142 int error = 0;
2143 int new_flags, temp_flags;
2144 size_t namelen, onamelen;
2145 size_t descrlen;
2146 char *descrbuf, *odescrbuf;
2147 char new_name[IFNAMSIZ];
2148 struct ifaddr *ifa;
2149 struct sockaddr_dl *sdl;
2150
2151 ifr = (struct ifreq *)data;
2152 switch (cmd) {
2153 case SIOCGIFINDEX:
2154 ifr->ifr_index = ifp->if_index;
2155 break;
2156
2157 case SIOCGIFFLAGS:
2158 temp_flags = ifp->if_flags | ifp->if_drv_flags;
2159 ifr->ifr_flags = temp_flags & 0xffff;
2160 ifr->ifr_flagshigh = temp_flags >> 16;
2161 break;
2162
2163 case SIOCGIFCAP:
2164 ifr->ifr_reqcap = ifp->if_capabilities;
2165 ifr->ifr_curcap = ifp->if_capenable;
2166 break;
2167
2168 #ifdef MAC
2169 case SIOCGIFMAC:
2170 error = mac_ifnet_ioctl_get(td->td_ucred, ifr, ifp);
2171 break;
2172 #endif
2173
2174 case SIOCGIFMETRIC:
2175 ifr->ifr_metric = ifp->if_metric;
2176 break;
2177
2178 case SIOCGIFMTU:
2179 ifr->ifr_mtu = ifp->if_mtu;
2180 break;
2181
2182 case SIOCGIFPHYS:
2183 ifr->ifr_phys = ifp->if_physical;
2184 break;
2185
2186 case SIOCGIFDESCR:
2187 error = 0;
2188 sx_slock(&ifdescr_sx);
2189 if (ifp->if_description == NULL)
2190 error = ENOMSG;
2191 else {
2192 /* space for terminating nul */
2193 descrlen = strlen(ifp->if_description) + 1;
2194 if (ifr->ifr_buffer.length < descrlen)
2195 ifr->ifr_buffer.buffer = NULL;
2196 else
2197 error = copyout(ifp->if_description,
2198 ifr->ifr_buffer.buffer, descrlen);
2199 ifr->ifr_buffer.length = descrlen;
2200 }
2201 sx_sunlock(&ifdescr_sx);
2202 break;
2203
2204 case SIOCSIFDESCR:
2205 error = priv_check(td, PRIV_NET_SETIFDESCR);
2206 if (error)
2207 return (error);
2208
2209 /*
2210 * Copy only (length-1) bytes to make sure that
2211 * if_description is always nul terminated. The
2212 * length parameter is supposed to count the
2213 * terminating nul in.
2214 */
2215 if (ifr->ifr_buffer.length > ifdescr_maxlen)
2216 return (ENAMETOOLONG);
2217 else if (ifr->ifr_buffer.length == 0)
2218 descrbuf = NULL;
2219 else {
2220 descrbuf = malloc(ifr->ifr_buffer.length, M_IFDESCR,
2221 M_WAITOK | M_ZERO);
2222 error = copyin(ifr->ifr_buffer.buffer, descrbuf,
2223 ifr->ifr_buffer.length - 1);
2224 if (error) {
2225 free(descrbuf, M_IFDESCR);
2226 break;
2227 }
2228 }
2229
2230 sx_xlock(&ifdescr_sx);
2231 odescrbuf = ifp->if_description;
2232 ifp->if_description = descrbuf;
2233 sx_xunlock(&ifdescr_sx);
2234
2235 getmicrotime(&ifp->if_lastchange);
2236 free(odescrbuf, M_IFDESCR);
2237 break;
2238
2239 case SIOCGIFFIB:
2240 ifr->ifr_fib = ifp->if_fib;
2241 break;
2242
2243 case SIOCSIFFIB:
2244 error = priv_check(td, PRIV_NET_SETIFFIB);
2245 if (error)
2246 return (error);
2247 if (ifr->ifr_fib >= rt_numfibs)
2248 return (EINVAL);
2249
2250 ifp->if_fib = ifr->ifr_fib;
2251 break;
2252
2253 case SIOCSIFFLAGS:
2254 error = priv_check(td, PRIV_NET_SETIFFLAGS);
2255 if (error)
2256 return (error);
2257 /*
2258 * Currently, no driver owned flags pass the IFF_CANTCHANGE
2259 * check, so we don't need special handling here yet.
2260 */
2261 new_flags = (ifr->ifr_flags & 0xffff) |
2262 (ifr->ifr_flagshigh << 16);
2263 if (ifp->if_flags & IFF_SMART) {
2264 /* Smart drivers twiddle their own routes */
2265 } else if (ifp->if_flags & IFF_UP &&
2266 (new_flags & IFF_UP) == 0) {
2267 int s = splimp();
2268 if_down(ifp);
2269 splx(s);
2270 } else if (new_flags & IFF_UP &&
2271 (ifp->if_flags & IFF_UP) == 0) {
2272 int s = splimp();
2273 if_up(ifp);
2274 splx(s);
2275 }
2276 /* See if permanently promiscuous mode bit is about to flip */
2277 if ((ifp->if_flags ^ new_flags) & IFF_PPROMISC) {
2278 if (new_flags & IFF_PPROMISC)
2279 ifp->if_flags |= IFF_PROMISC;
2280 else if (ifp->if_pcount == 0)
2281 ifp->if_flags &= ~IFF_PROMISC;
2282 log(LOG_INFO, "%s: permanently promiscuous mode %s\n",
2283 ifp->if_xname,
2284 (new_flags & IFF_PPROMISC) ? "enabled" : "disabled");
2285 }
2286 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) |
2287 (new_flags &~ IFF_CANTCHANGE);
2288 if (ifp->if_ioctl) {
2289 (void) (*ifp->if_ioctl)(ifp, cmd, data);
2290 }
2291 getmicrotime(&ifp->if_lastchange);
2292 break;
2293
2294 case SIOCSIFCAP:
2295 error = priv_check(td, PRIV_NET_SETIFCAP);
2296 if (error)
2297 return (error);
2298 if (ifp->if_ioctl == NULL)
2299 return (EOPNOTSUPP);
2300 if (ifr->ifr_reqcap & ~ifp->if_capabilities)
2301 return (EINVAL);
2302 error = (*ifp->if_ioctl)(ifp, cmd, data);
2303 if (error == 0)
2304 getmicrotime(&ifp->if_lastchange);
2305 break;
2306
2307 #ifdef MAC
2308 case SIOCSIFMAC:
2309 error = mac_ifnet_ioctl_set(td->td_ucred, ifr, ifp);
2310 break;
2311 #endif
2312
2313 case SIOCSIFNAME:
2314 error = priv_check(td, PRIV_NET_SETIFNAME);
2315 if (error)
2316 return (error);
2317 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL);
2318 if (error != 0)
2319 return (error);
2320 if (new_name[0] == '\0')
2321 return (EINVAL);
2322 if (ifunit(new_name) != NULL)
2323 return (EEXIST);
2324
2325 /*
2326 * XXX: Locking. Nothing else seems to lock if_flags,
2327 * and there are numerous other races with the
2328 * ifunit() checks not being atomic with namespace
2329 * changes (renames, vmoves, if_attach, etc).
2330 */
2331 ifp->if_flags |= IFF_RENAMING;
2332
2333 /* Announce the departure of the interface. */
2334 rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
2335 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp);
2336
2337 log(LOG_INFO, "%s: changing name to '%s'\n",
2338 ifp->if_xname, new_name);
2339
2340 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname));
2341 ifa = ifp->if_addr;
2342 IFA_LOCK(ifa);
2343 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
2344 namelen = strlen(new_name);
2345 onamelen = sdl->sdl_nlen;
2346 /*
2347 * Move the address if needed. This is safe because we
2348 * allocate space for a name of length IFNAMSIZ when we
2349 * create this in if_attach().
2350 */
2351 if (namelen != onamelen) {
2352 bcopy(sdl->sdl_data + onamelen,
2353 sdl->sdl_data + namelen, sdl->sdl_alen);
2354 }
2355 bcopy(new_name, sdl->sdl_data, namelen);
2356 sdl->sdl_nlen = namelen;
2357 sdl = (struct sockaddr_dl *)ifa->ifa_netmask;
2358 bzero(sdl->sdl_data, onamelen);
2359 while (namelen != 0)
2360 sdl->sdl_data[--namelen] = 0xff;
2361 IFA_UNLOCK(ifa);
2362
2363 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp);
2364 /* Announce the return of the interface. */
2365 rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
2366
2367 ifp->if_flags &= ~IFF_RENAMING;
2368 break;
2369
2370 #ifdef VIMAGE
2371 case SIOCSIFVNET:
2372 error = priv_check(td, PRIV_NET_SETIFVNET);
2373 if (error)
2374 return (error);
2375 error = if_vmove_loan(td, ifp, ifr->ifr_name, ifr->ifr_jid);
2376 break;
2377 #endif
2378
2379 case SIOCSIFMETRIC:
2380 error = priv_check(td, PRIV_NET_SETIFMETRIC);
2381 if (error)
2382 return (error);
2383 ifp->if_metric = ifr->ifr_metric;
2384 getmicrotime(&ifp->if_lastchange);
2385 break;
2386
2387 case SIOCSIFPHYS:
2388 error = priv_check(td, PRIV_NET_SETIFPHYS);
2389 if (error)
2390 return (error);
2391 if (ifp->if_ioctl == NULL)
2392 return (EOPNOTSUPP);
2393 error = (*ifp->if_ioctl)(ifp, cmd, data);
2394 if (error == 0)
2395 getmicrotime(&ifp->if_lastchange);
2396 break;
2397
2398 case SIOCSIFMTU:
2399 {
2400 u_long oldmtu = ifp->if_mtu;
2401
2402 error = priv_check(td, PRIV_NET_SETIFMTU);
2403 if (error)
2404 return (error);
2405 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU)
2406 return (EINVAL);
2407 if (ifp->if_ioctl == NULL)
2408 return (EOPNOTSUPP);
2409 error = (*ifp->if_ioctl)(ifp, cmd, data);
2410 if (error == 0) {
2411 getmicrotime(&ifp->if_lastchange);
2412 rt_ifmsg(ifp);
2413 }
2414 /*
2415 * If the link MTU changed, do network layer specific procedure.
2416 */
2417 if (ifp->if_mtu != oldmtu) {
2418 #ifdef INET6
2419 nd6_setmtu(ifp);
2420 #endif
2421 }
2422 break;
2423 }
2424
2425 case SIOCADDMULTI:
2426 case SIOCDELMULTI:
2427 if (cmd == SIOCADDMULTI)
2428 error = priv_check(td, PRIV_NET_ADDMULTI);
2429 else
2430 error = priv_check(td, PRIV_NET_DELMULTI);
2431 if (error)
2432 return (error);
2433
2434 /* Don't allow group membership on non-multicast interfaces. */
2435 if ((ifp->if_flags & IFF_MULTICAST) == 0)
2436 return (EOPNOTSUPP);
2437
2438 /* Don't let users screw up protocols' entries. */
2439 if (ifr->ifr_addr.sa_family != AF_LINK)
2440 return (EINVAL);
2441
2442 if (cmd == SIOCADDMULTI) {
2443 struct ifmultiaddr *ifma;
2444
2445 /*
2446 * Userland is only permitted to join groups once
2447 * via the if_addmulti() KPI, because it cannot hold
2448 * struct ifmultiaddr * between calls. It may also
2449 * lose a race while we check if the membership
2450 * already exists.
2451 */
2452 IF_ADDR_RLOCK(ifp);
2453 ifma = if_findmulti(ifp, &ifr->ifr_addr);
2454 IF_ADDR_RUNLOCK(ifp);
2455 if (ifma != NULL)
2456 error = EADDRINUSE;
2457 else
2458 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma);
2459 } else {
2460 error = if_delmulti(ifp, &ifr->ifr_addr);
2461 }
2462 if (error == 0)
2463 getmicrotime(&ifp->if_lastchange);
2464 break;
2465
2466 case SIOCSIFPHYADDR:
2467 case SIOCDIFPHYADDR:
2468 #ifdef INET6
2469 case SIOCSIFPHYADDR_IN6:
2470 #endif
2471 case SIOCSLIFPHYADDR:
2472 case SIOCSIFMEDIA:
2473 case SIOCSIFGENERIC:
2474 error = priv_check(td, PRIV_NET_HWIOCTL);
2475 if (error)
2476 return (error);
2477 if (ifp->if_ioctl == NULL)
2478 return (EOPNOTSUPP);
2479 error = (*ifp->if_ioctl)(ifp, cmd, data);
2480 if (error == 0)
2481 getmicrotime(&ifp->if_lastchange);
2482 break;
2483
2484 case SIOCGIFSTATUS:
2485 ifs = (struct ifstat *)data;
2486 ifs->ascii[0] = '\0';
2487
2488 case SIOCGIFPSRCADDR:
2489 case SIOCGIFPDSTADDR:
2490 case SIOCGLIFPHYADDR:
2491 case SIOCGIFMEDIA:
2492 case SIOCGIFGENERIC:
2493 if (ifp->if_ioctl == NULL)
2494 return (EOPNOTSUPP);
2495 error = (*ifp->if_ioctl)(ifp, cmd, data);
2496 break;
2497
2498 case SIOCSIFLLADDR:
2499 error = priv_check(td, PRIV_NET_SETLLADDR);
2500 if (error)
2501 return (error);
2502 error = if_setlladdr(ifp,
2503 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len);
2504 EVENTHANDLER_INVOKE(iflladdr_event, ifp);
2505 break;
2506
2507 case SIOCAIFGROUP:
2508 {
2509 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr;
2510
2511 error = priv_check(td, PRIV_NET_ADDIFGROUP);
2512 if (error)
2513 return (error);
2514 if ((error = if_addgroup(ifp, ifgr->ifgr_group)))
2515 return (error);
2516 break;
2517 }
2518
2519 case SIOCGIFGROUP:
2520 if ((error = if_getgroup((struct ifgroupreq *)ifr, ifp)))
2521 return (error);
2522 break;
2523
2524 case SIOCDIFGROUP:
2525 {
2526 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr;
2527
2528 error = priv_check(td, PRIV_NET_DELIFGROUP);
2529 if (error)
2530 return (error);
2531 if ((error = if_delgroup(ifp, ifgr->ifgr_group)))
2532 return (error);
2533 break;
2534 }
2535
2536 default:
2537 error = ENOIOCTL;
2538 break;
2539 }
2540 return (error);
2541 }
2542
2543 #ifdef COMPAT_FREEBSD32
2544 struct ifconf32 {
2545 int32_t ifc_len;
2546 union {
2547 uint32_t ifcu_buf;
2548 uint32_t ifcu_req;
2549 } ifc_ifcu;
2550 };
2551 #define SIOCGIFCONF32 _IOWR('i', 36, struct ifconf32)
2552 #endif
2553
2554 /*
2555 * Interface ioctls.
2556 */
2557 int
ifioctl(struct socket * so,u_long cmd,caddr_t data,struct thread * td)2558 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td)
2559 {
2560 struct ifnet *ifp;
2561 struct ifreq *ifr;
2562 int error;
2563 int oif_flags;
2564
2565 CURVNET_SET(so->so_vnet);
2566 switch (cmd) {
2567 case SIOCGIFCONF:
2568 case OSIOCGIFCONF:
2569 error = ifconf(cmd, data);
2570 CURVNET_RESTORE();
2571 return (error);
2572
2573 #ifdef COMPAT_FREEBSD32
2574 case SIOCGIFCONF32:
2575 {
2576 struct ifconf32 *ifc32;
2577 struct ifconf ifc;
2578
2579 ifc32 = (struct ifconf32 *)data;
2580 ifc.ifc_len = ifc32->ifc_len;
2581 ifc.ifc_buf = PTRIN(ifc32->ifc_buf);
2582
2583 error = ifconf(SIOCGIFCONF, (void *)&ifc);
2584 CURVNET_RESTORE();
2585 if (error == 0)
2586 ifc32->ifc_len = ifc.ifc_len;
2587 return (error);
2588 }
2589 #endif
2590 }
2591 ifr = (struct ifreq *)data;
2592
2593 switch (cmd) {
2594 #ifdef VIMAGE
2595 case SIOCSIFRVNET:
2596 error = priv_check(td, PRIV_NET_SETIFVNET);
2597 if (error == 0)
2598 error = if_vmove_reclaim(td, ifr->ifr_name,
2599 ifr->ifr_jid);
2600 CURVNET_RESTORE();
2601 return (error);
2602 #endif
2603 case SIOCIFCREATE:
2604 case SIOCIFCREATE2:
2605 error = priv_check(td, PRIV_NET_IFCREATE);
2606 if (error == 0)
2607 error = if_clone_create(ifr->ifr_name,
2608 sizeof(ifr->ifr_name),
2609 cmd == SIOCIFCREATE2 ? ifr->ifr_data : NULL);
2610 CURVNET_RESTORE();
2611 return (error);
2612 case SIOCIFDESTROY:
2613 error = priv_check(td, PRIV_NET_IFDESTROY);
2614 if (error == 0)
2615 error = if_clone_destroy(ifr->ifr_name);
2616 CURVNET_RESTORE();
2617 return (error);
2618
2619 case SIOCIFGCLONERS:
2620 error = if_clone_list((struct if_clonereq *)data);
2621 CURVNET_RESTORE();
2622 return (error);
2623 case SIOCGIFGMEMB:
2624 error = if_getgroupmembers((struct ifgroupreq *)data);
2625 CURVNET_RESTORE();
2626 return (error);
2627 }
2628
2629 ifp = ifunit_ref(ifr->ifr_name);
2630 if (ifp == NULL) {
2631 CURVNET_RESTORE();
2632 return (ENXIO);
2633 }
2634
2635 error = ifhwioctl(cmd, ifp, data, td);
2636 if (error != ENOIOCTL) {
2637 if_rele(ifp);
2638 CURVNET_RESTORE();
2639 return (error);
2640 }
2641
2642 oif_flags = ifp->if_flags;
2643 if (so->so_proto == NULL) {
2644 if_rele(ifp);
2645 CURVNET_RESTORE();
2646 return (EOPNOTSUPP);
2647 }
2648
2649 /*
2650 * Pass the request on to the socket control method, and if the
2651 * latter returns EOPNOTSUPP, directly to the interface.
2652 *
2653 * Make an exception for the legacy SIOCSIF* requests. Drivers
2654 * trust SIOCSIFADDR et al to come from an already privileged
2655 * layer, and do not perform any credentials checks or input
2656 * validation.
2657 */
2658 #ifndef COMPAT_43
2659 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd,
2660 data,
2661 ifp, td));
2662 if (error == EOPNOTSUPP && ifp != NULL && ifp->if_ioctl != NULL &&
2663 cmd != SIOCSIFADDR && cmd != SIOCSIFBRDADDR &&
2664 cmd != SIOCSIFDSTADDR && cmd != SIOCSIFNETMASK)
2665 error = (*ifp->if_ioctl)(ifp, cmd, data);
2666 #else
2667 {
2668 u_long ocmd = cmd;
2669
2670 switch (cmd) {
2671
2672 case SIOCSIFDSTADDR:
2673 case SIOCSIFADDR:
2674 case SIOCSIFBRDADDR:
2675 case SIOCSIFNETMASK:
2676 #if BYTE_ORDER != BIG_ENDIAN
2677 if (ifr->ifr_addr.sa_family == 0 &&
2678 ifr->ifr_addr.sa_len < 16) {
2679 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len;
2680 ifr->ifr_addr.sa_len = 16;
2681 }
2682 #else
2683 if (ifr->ifr_addr.sa_len == 0)
2684 ifr->ifr_addr.sa_len = 16;
2685 #endif
2686 break;
2687
2688 case OSIOCGIFADDR:
2689 cmd = SIOCGIFADDR;
2690 break;
2691
2692 case OSIOCGIFDSTADDR:
2693 cmd = SIOCGIFDSTADDR;
2694 break;
2695
2696 case OSIOCGIFBRDADDR:
2697 cmd = SIOCGIFBRDADDR;
2698 break;
2699
2700 case OSIOCGIFNETMASK:
2701 cmd = SIOCGIFNETMASK;
2702 }
2703 error = ((*so->so_proto->pr_usrreqs->pru_control)(so,
2704 cmd,
2705 data,
2706 ifp, td));
2707 if (error == EOPNOTSUPP && ifp != NULL &&
2708 ifp->if_ioctl != NULL &&
2709 cmd != SIOCSIFADDR && cmd != SIOCSIFBRDADDR &&
2710 cmd != SIOCSIFDSTADDR && cmd != SIOCSIFNETMASK)
2711 error = (*ifp->if_ioctl)(ifp, cmd, data);
2712 switch (ocmd) {
2713
2714 case OSIOCGIFADDR:
2715 case OSIOCGIFDSTADDR:
2716 case OSIOCGIFBRDADDR:
2717 case OSIOCGIFNETMASK:
2718 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family;
2719
2720 }
2721 }
2722 #endif /* COMPAT_43 */
2723
2724 if ((oif_flags ^ ifp->if_flags) & IFF_UP) {
2725 #ifdef INET6
2726 if (ifp->if_flags & IFF_UP) {
2727 int s = splimp();
2728 in6_if_up(ifp);
2729 splx(s);
2730 }
2731 #endif
2732 }
2733 if_rele(ifp);
2734 CURVNET_RESTORE();
2735 return (error);
2736 }
2737
2738 /*
2739 * The code common to handling reference counted flags,
2740 * e.g., in ifpromisc() and if_allmulti().
2741 * The "pflag" argument can specify a permanent mode flag to check,
2742 * such as IFF_PPROMISC for promiscuous mode; should be 0 if none.
2743 *
2744 * Only to be used on stack-owned flags, not driver-owned flags.
2745 */
2746 static int
if_setflag(struct ifnet * ifp,int flag,int pflag,int * refcount,int onswitch)2747 if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch)
2748 {
2749 struct ifreq ifr;
2750 int error;
2751 int oldflags, oldcount;
2752
2753 /* Sanity checks to catch programming errors */
2754 KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0,
2755 ("%s: setting driver-owned flag %d", __func__, flag));
2756
2757 if (onswitch)
2758 KASSERT(*refcount >= 0,
2759 ("%s: increment negative refcount %d for flag %d",
2760 __func__, *refcount, flag));
2761 else
2762 KASSERT(*refcount > 0,
2763 ("%s: decrement non-positive refcount %d for flag %d",
2764 __func__, *refcount, flag));
2765
2766 /* In case this mode is permanent, just touch refcount */
2767 if (ifp->if_flags & pflag) {
2768 *refcount += onswitch ? 1 : -1;
2769 return (0);
2770 }
2771
2772 /* Save ifnet parameters for if_ioctl() may fail */
2773 oldcount = *refcount;
2774 oldflags = ifp->if_flags;
2775
2776 /*
2777 * See if we aren't the only and touching refcount is enough.
2778 * Actually toggle interface flag if we are the first or last.
2779 */
2780 if (onswitch) {
2781 if ((*refcount)++)
2782 return (0);
2783 ifp->if_flags |= flag;
2784 } else {
2785 if (--(*refcount))
2786 return (0);
2787 ifp->if_flags &= ~flag;
2788 }
2789
2790 /* Call down the driver since we've changed interface flags */
2791 if (ifp->if_ioctl == NULL) {
2792 error = EOPNOTSUPP;
2793 goto recover;
2794 }
2795 ifr.ifr_flags = ifp->if_flags & 0xffff;
2796 ifr.ifr_flagshigh = ifp->if_flags >> 16;
2797 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
2798 if (error)
2799 goto recover;
2800 /* Notify userland that interface flags have changed */
2801 rt_ifmsg(ifp);
2802 return (0);
2803
2804 recover:
2805 /* Recover after driver error */
2806 *refcount = oldcount;
2807 ifp->if_flags = oldflags;
2808 return (error);
2809 }
2810
2811 /*
2812 * Set/clear promiscuous mode on interface ifp based on the truth value
2813 * of pswitch. The calls are reference counted so that only the first
2814 * "on" request actually has an effect, as does the final "off" request.
2815 * Results are undefined if the "off" and "on" requests are not matched.
2816 */
2817 int
ifpromisc(struct ifnet * ifp,int pswitch)2818 ifpromisc(struct ifnet *ifp, int pswitch)
2819 {
2820 int error;
2821 int oldflags = ifp->if_flags;
2822
2823 error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC,
2824 &ifp->if_pcount, pswitch);
2825 /* If promiscuous mode status has changed, log a message */
2826 if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC))
2827 log(LOG_INFO, "%s: promiscuous mode %s\n",
2828 ifp->if_xname,
2829 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled");
2830 return (error);
2831 }
2832
2833 /*
2834 * Return interface configuration
2835 * of system. List may be used
2836 * in later ioctl's (above) to get
2837 * other information.
2838 */
2839 /*ARGSUSED*/
2840 static int
ifconf(u_long cmd,caddr_t data)2841 ifconf(u_long cmd, caddr_t data)
2842 {
2843 struct ifconf *ifc = (struct ifconf *)data;
2844 struct ifnet *ifp;
2845 struct ifaddr *ifa;
2846 struct ifreq ifr;
2847 struct sbuf *sb;
2848 int error, full = 0, valid_len, max_len;
2849
2850 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */
2851 max_len = MAXPHYS - 1;
2852
2853 /* Prevent hostile input from being able to crash the system */
2854 if (ifc->ifc_len <= 0)
2855 return (EINVAL);
2856
2857 again:
2858 if (ifc->ifc_len <= max_len) {
2859 max_len = ifc->ifc_len;
2860 full = 1;
2861 }
2862 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN);
2863 max_len = 0;
2864 valid_len = 0;
2865
2866 IFNET_RLOCK();
2867 TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
2868 int addrs;
2869
2870 /*
2871 * Zero the ifr_name buffer to make sure we don't
2872 * disclose the contents of the stack.
2873 */
2874 memset(ifr.ifr_name, 0, sizeof(ifr.ifr_name));
2875
2876 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name))
2877 >= sizeof(ifr.ifr_name)) {
2878 sbuf_delete(sb);
2879 IFNET_RUNLOCK();
2880 return (ENAMETOOLONG);
2881 }
2882
2883 addrs = 0;
2884 IF_ADDR_RLOCK(ifp);
2885 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2886 struct sockaddr *sa = ifa->ifa_addr;
2887
2888 if (prison_if(curthread->td_ucred, sa) != 0)
2889 continue;
2890 addrs++;
2891 #ifdef COMPAT_43
2892 if (cmd == OSIOCGIFCONF) {
2893 struct osockaddr *osa =
2894 (struct osockaddr *)&ifr.ifr_addr;
2895 ifr.ifr_addr = *sa;
2896 osa->sa_family = sa->sa_family;
2897 sbuf_bcat(sb, &ifr, sizeof(ifr));
2898 max_len += sizeof(ifr);
2899 } else
2900 #endif
2901 if (sa->sa_len <= sizeof(*sa)) {
2902 ifr.ifr_addr = *sa;
2903 sbuf_bcat(sb, &ifr, sizeof(ifr));
2904 max_len += sizeof(ifr);
2905 } else {
2906 sbuf_bcat(sb, &ifr,
2907 offsetof(struct ifreq, ifr_addr));
2908 max_len += offsetof(struct ifreq, ifr_addr);
2909 sbuf_bcat(sb, sa, sa->sa_len);
2910 max_len += sa->sa_len;
2911 }
2912
2913 if (sbuf_error(sb) == 0)
2914 valid_len = sbuf_len(sb);
2915 }
2916 IF_ADDR_RUNLOCK(ifp);
2917 if (addrs == 0) {
2918 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
2919 sbuf_bcat(sb, &ifr, sizeof(ifr));
2920 max_len += sizeof(ifr);
2921
2922 if (sbuf_error(sb) == 0)
2923 valid_len = sbuf_len(sb);
2924 }
2925 }
2926 IFNET_RUNLOCK();
2927
2928 /*
2929 * If we didn't allocate enough space (uncommon), try again. If
2930 * we have already allocated as much space as we are allowed,
2931 * return what we've got.
2932 */
2933 if (valid_len != max_len && !full) {
2934 sbuf_delete(sb);
2935 goto again;
2936 }
2937
2938 ifc->ifc_len = valid_len;
2939 sbuf_finish(sb);
2940 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len);
2941 sbuf_delete(sb);
2942 return (error);
2943 }
2944
2945 /*
2946 * Just like ifpromisc(), but for all-multicast-reception mode.
2947 */
2948 int
if_allmulti(struct ifnet * ifp,int onswitch)2949 if_allmulti(struct ifnet *ifp, int onswitch)
2950 {
2951
2952 return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch));
2953 }
2954
2955 struct ifmultiaddr *
if_findmulti(struct ifnet * ifp,struct sockaddr * sa)2956 if_findmulti(struct ifnet *ifp, struct sockaddr *sa)
2957 {
2958 struct ifmultiaddr *ifma;
2959
2960 IF_ADDR_LOCK_ASSERT(ifp);
2961
2962 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
2963 if (sa->sa_family == AF_LINK) {
2964 if (sa_dl_equal(ifma->ifma_addr, sa))
2965 break;
2966 } else {
2967 if (sa_equal(ifma->ifma_addr, sa))
2968 break;
2969 }
2970 }
2971
2972 return ifma;
2973 }
2974
2975 /*
2976 * Allocate a new ifmultiaddr and initialize based on passed arguments. We
2977 * make copies of passed sockaddrs. The ifmultiaddr will not be added to
2978 * the ifnet multicast address list here, so the caller must do that and
2979 * other setup work (such as notifying the device driver). The reference
2980 * count is initialized to 1.
2981 */
2982 static struct ifmultiaddr *
if_allocmulti(struct ifnet * ifp,struct sockaddr * sa,struct sockaddr * llsa,int mflags)2983 if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa,
2984 int mflags)
2985 {
2986 struct ifmultiaddr *ifma;
2987 struct sockaddr *dupsa;
2988
2989 ifma = malloc(sizeof *ifma, M_IFMADDR, mflags |
2990 M_ZERO);
2991 if (ifma == NULL)
2992 return (NULL);
2993
2994 dupsa = malloc(sa->sa_len, M_IFMADDR, mflags);
2995 if (dupsa == NULL) {
2996 free(ifma, M_IFMADDR);
2997 return (NULL);
2998 }
2999 bcopy(sa, dupsa, sa->sa_len);
3000 ifma->ifma_addr = dupsa;
3001
3002 ifma->ifma_ifp = ifp;
3003 ifma->ifma_refcount = 1;
3004 ifma->ifma_protospec = NULL;
3005
3006 if (llsa == NULL) {
3007 ifma->ifma_lladdr = NULL;
3008 return (ifma);
3009 }
3010
3011 dupsa = malloc(llsa->sa_len, M_IFMADDR, mflags);
3012 if (dupsa == NULL) {
3013 free(ifma->ifma_addr, M_IFMADDR);
3014 free(ifma, M_IFMADDR);
3015 return (NULL);
3016 }
3017 bcopy(llsa, dupsa, llsa->sa_len);
3018 ifma->ifma_lladdr = dupsa;
3019
3020 return (ifma);
3021 }
3022
3023 /*
3024 * if_freemulti: free ifmultiaddr structure and possibly attached related
3025 * addresses. The caller is responsible for implementing reference
3026 * counting, notifying the driver, handling routing messages, and releasing
3027 * any dependent link layer state.
3028 */
3029 static void
if_freemulti(struct ifmultiaddr * ifma)3030 if_freemulti(struct ifmultiaddr *ifma)
3031 {
3032
3033 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti: refcount %d",
3034 ifma->ifma_refcount));
3035 KASSERT(ifma->ifma_protospec == NULL,
3036 ("if_freemulti: protospec not NULL"));
3037
3038 if (ifma->ifma_lladdr != NULL)
3039 free(ifma->ifma_lladdr, M_IFMADDR);
3040 free(ifma->ifma_addr, M_IFMADDR);
3041 free(ifma, M_IFMADDR);
3042 }
3043
3044 /*
3045 * Register an additional multicast address with a network interface.
3046 *
3047 * - If the address is already present, bump the reference count on the
3048 * address and return.
3049 * - If the address is not link-layer, look up a link layer address.
3050 * - Allocate address structures for one or both addresses, and attach to the
3051 * multicast address list on the interface. If automatically adding a link
3052 * layer address, the protocol address will own a reference to the link
3053 * layer address, to be freed when it is freed.
3054 * - Notify the network device driver of an addition to the multicast address
3055 * list.
3056 *
3057 * 'sa' points to caller-owned memory with the desired multicast address.
3058 *
3059 * 'retifma' will be used to return a pointer to the resulting multicast
3060 * address reference, if desired.
3061 */
3062 int
if_addmulti(struct ifnet * ifp,struct sockaddr * sa,struct ifmultiaddr ** retifma)3063 if_addmulti(struct ifnet *ifp, struct sockaddr *sa,
3064 struct ifmultiaddr **retifma)
3065 {
3066 struct ifmultiaddr *ifma, *ll_ifma;
3067 struct sockaddr *llsa;
3068 int error;
3069
3070 /*
3071 * If the address is already present, return a new reference to it;
3072 * otherwise, allocate storage and set up a new address.
3073 */
3074 IF_ADDR_WLOCK(ifp);
3075 ifma = if_findmulti(ifp, sa);
3076 if (ifma != NULL) {
3077 ifma->ifma_refcount++;
3078 if (retifma != NULL)
3079 *retifma = ifma;
3080 IF_ADDR_WUNLOCK(ifp);
3081 return (0);
3082 }
3083
3084 /*
3085 * The address isn't already present; resolve the protocol address
3086 * into a link layer address, and then look that up, bump its
3087 * refcount or allocate an ifma for that also. If 'llsa' was
3088 * returned, we will need to free it later.
3089 */
3090 llsa = NULL;
3091 ll_ifma = NULL;
3092 if (ifp->if_resolvemulti != NULL) {
3093 error = ifp->if_resolvemulti(ifp, &llsa, sa);
3094 if (error)
3095 goto unlock_out;
3096 }
3097
3098 /*
3099 * Allocate the new address. Don't hook it up yet, as we may also
3100 * need to allocate a link layer multicast address.
3101 */
3102 ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT);
3103 if (ifma == NULL) {
3104 error = ENOMEM;
3105 goto free_llsa_out;
3106 }
3107
3108 /*
3109 * If a link layer address is found, we'll need to see if it's
3110 * already present in the address list, or allocate is as well.
3111 * When this block finishes, the link layer address will be on the
3112 * list.
3113 */
3114 if (llsa != NULL) {
3115 ll_ifma = if_findmulti(ifp, llsa);
3116 if (ll_ifma == NULL) {
3117 ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT);
3118 if (ll_ifma == NULL) {
3119 --ifma->ifma_refcount;
3120 if_freemulti(ifma);
3121 error = ENOMEM;
3122 goto free_llsa_out;
3123 }
3124 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma,
3125 ifma_link);
3126 } else
3127 ll_ifma->ifma_refcount++;
3128 ifma->ifma_llifma = ll_ifma;
3129 }
3130
3131 /*
3132 * We now have a new multicast address, ifma, and possibly a new or
3133 * referenced link layer address. Add the primary address to the
3134 * ifnet address list.
3135 */
3136 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link);
3137
3138 if (retifma != NULL)
3139 *retifma = ifma;
3140
3141 /*
3142 * Must generate the message while holding the lock so that 'ifma'
3143 * pointer is still valid.
3144 */
3145 rt_newmaddrmsg(RTM_NEWMADDR, ifma);
3146 IF_ADDR_WUNLOCK(ifp);
3147
3148 /*
3149 * We are certain we have added something, so call down to the
3150 * interface to let them know about it.
3151 */
3152 if (ifp->if_ioctl != NULL) {
3153 (void) (*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0);
3154 }
3155
3156 if (llsa != NULL)
3157 free(llsa, M_IFMADDR);
3158
3159 return (0);
3160
3161 free_llsa_out:
3162 if (llsa != NULL)
3163 free(llsa, M_IFMADDR);
3164
3165 unlock_out:
3166 IF_ADDR_WUNLOCK(ifp);
3167 return (error);
3168 }
3169
3170 /*
3171 * Delete a multicast group membership by network-layer group address.
3172 *
3173 * Returns ENOENT if the entry could not be found. If ifp no longer
3174 * exists, results are undefined. This entry point should only be used
3175 * from subsystems which do appropriate locking to hold ifp for the
3176 * duration of the call.
3177 * Network-layer protocol domains must use if_delmulti_ifma().
3178 */
3179 int
if_delmulti(struct ifnet * ifp,struct sockaddr * sa)3180 if_delmulti(struct ifnet *ifp, struct sockaddr *sa)
3181 {
3182 struct ifmultiaddr *ifma;
3183 int lastref;
3184 #ifdef INVARIANTS
3185 struct ifnet *oifp;
3186
3187 IFNET_RLOCK_NOSLEEP();
3188 TAILQ_FOREACH(oifp, &V_ifnet, if_link)
3189 if (ifp == oifp)
3190 break;
3191 if (ifp != oifp)
3192 ifp = NULL;
3193 IFNET_RUNLOCK_NOSLEEP();
3194
3195 KASSERT(ifp != NULL, ("%s: ifnet went away", __func__));
3196 #endif
3197 if (ifp == NULL)
3198 return (ENOENT);
3199
3200 IF_ADDR_WLOCK(ifp);
3201 lastref = 0;
3202 ifma = if_findmulti(ifp, sa);
3203 if (ifma != NULL)
3204 lastref = if_delmulti_locked(ifp, ifma, 0);
3205 IF_ADDR_WUNLOCK(ifp);
3206
3207 if (ifma == NULL)
3208 return (ENOENT);
3209
3210 if (lastref && ifp->if_ioctl != NULL) {
3211 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0);
3212 }
3213
3214 return (0);
3215 }
3216
3217 /*
3218 * Delete all multicast group membership for an interface.
3219 * Should be used to quickly flush all multicast filters.
3220 */
3221 void
if_delallmulti(struct ifnet * ifp)3222 if_delallmulti(struct ifnet *ifp)
3223 {
3224 struct ifmultiaddr *ifma;
3225 struct ifmultiaddr *next;
3226
3227 IF_ADDR_WLOCK(ifp);
3228 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next)
3229 if_delmulti_locked(ifp, ifma, 0);
3230 IF_ADDR_WUNLOCK(ifp);
3231 }
3232
3233 /*
3234 * Delete a multicast group membership by group membership pointer.
3235 * Network-layer protocol domains must use this routine.
3236 *
3237 * It is safe to call this routine if the ifp disappeared.
3238 */
3239 void
if_delmulti_ifma(struct ifmultiaddr * ifma)3240 if_delmulti_ifma(struct ifmultiaddr *ifma)
3241 {
3242 struct ifnet *ifp;
3243 int lastref;
3244
3245 ifp = ifma->ifma_ifp;
3246 #ifdef DIAGNOSTIC
3247 if (ifp == NULL) {
3248 printf("%s: ifma_ifp seems to be detached\n", __func__);
3249 } else {
3250 struct ifnet *oifp;
3251
3252 IFNET_RLOCK_NOSLEEP();
3253 TAILQ_FOREACH(oifp, &V_ifnet, if_link)
3254 if (ifp == oifp)
3255 break;
3256 if (ifp != oifp) {
3257 printf("%s: ifnet %p disappeared\n", __func__, ifp);
3258 ifp = NULL;
3259 }
3260 IFNET_RUNLOCK_NOSLEEP();
3261 }
3262 #endif
3263 /*
3264 * If and only if the ifnet instance exists: Acquire the address lock.
3265 */
3266 if (ifp != NULL)
3267 IF_ADDR_WLOCK(ifp);
3268
3269 lastref = if_delmulti_locked(ifp, ifma, 0);
3270
3271 if (ifp != NULL) {
3272 /*
3273 * If and only if the ifnet instance exists:
3274 * Release the address lock.
3275 * If the group was left: update the hardware hash filter.
3276 */
3277 IF_ADDR_WUNLOCK(ifp);
3278 if (lastref && ifp->if_ioctl != NULL) {
3279 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0);
3280 }
3281 }
3282 }
3283
3284 /*
3285 * Perform deletion of network-layer and/or link-layer multicast address.
3286 *
3287 * Return 0 if the reference count was decremented.
3288 * Return 1 if the final reference was released, indicating that the
3289 * hardware hash filter should be reprogrammed.
3290 */
3291 static int
if_delmulti_locked(struct ifnet * ifp,struct ifmultiaddr * ifma,int detaching)3292 if_delmulti_locked(struct ifnet *ifp, struct ifmultiaddr *ifma, int detaching)
3293 {
3294 struct ifmultiaddr *ll_ifma;
3295
3296 if (ifp != NULL && ifma->ifma_ifp != NULL) {
3297 KASSERT(ifma->ifma_ifp == ifp,
3298 ("%s: inconsistent ifp %p", __func__, ifp));
3299 IF_ADDR_WLOCK_ASSERT(ifp);
3300 }
3301
3302 ifp = ifma->ifma_ifp;
3303
3304 /*
3305 * If the ifnet is detaching, null out references to ifnet,
3306 * so that upper protocol layers will notice, and not attempt
3307 * to obtain locks for an ifnet which no longer exists. The
3308 * routing socket announcement must happen before the ifnet
3309 * instance is detached from the system.
3310 */
3311 if (detaching) {
3312 #ifdef DIAGNOSTIC
3313 printf("%s: detaching ifnet instance %p\n", __func__, ifp);
3314 #endif
3315 /*
3316 * ifp may already be nulled out if we are being reentered
3317 * to delete the ll_ifma.
3318 */
3319 if (ifp != NULL) {
3320 rt_newmaddrmsg(RTM_DELMADDR, ifma);
3321 ifma->ifma_ifp = NULL;
3322 }
3323 }
3324
3325 if (--ifma->ifma_refcount > 0)
3326 return 0;
3327
3328 /*
3329 * If this ifma is a network-layer ifma, a link-layer ifma may
3330 * have been associated with it. Release it first if so.
3331 */
3332 ll_ifma = ifma->ifma_llifma;
3333 if (ll_ifma != NULL) {
3334 KASSERT(ifma->ifma_lladdr != NULL,
3335 ("%s: llifma w/o lladdr", __func__));
3336 if (detaching)
3337 ll_ifma->ifma_ifp = NULL; /* XXX */
3338 if (--ll_ifma->ifma_refcount == 0) {
3339 if (ifp != NULL) {
3340 TAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma,
3341 ifma_link);
3342 }
3343 if_freemulti(ll_ifma);
3344 }
3345 }
3346
3347 if (ifp != NULL)
3348 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link);
3349
3350 if_freemulti(ifma);
3351
3352 /*
3353 * The last reference to this instance of struct ifmultiaddr
3354 * was released; the hardware should be notified of this change.
3355 */
3356 return 1;
3357 }
3358
3359 /*
3360 * Set the link layer address on an interface.
3361 *
3362 * At this time we only support certain types of interfaces,
3363 * and we don't allow the length of the address to change.
3364 */
3365 int
if_setlladdr(struct ifnet * ifp,const u_char * lladdr,int len)3366 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len)
3367 {
3368 struct sockaddr_dl *sdl;
3369 struct ifaddr *ifa;
3370 struct ifreq ifr;
3371
3372 IF_ADDR_RLOCK(ifp);
3373 ifa = ifp->if_addr;
3374 if (ifa == NULL) {
3375 IF_ADDR_RUNLOCK(ifp);
3376 return (EINVAL);
3377 }
3378 ifa_ref(ifa);
3379 IF_ADDR_RUNLOCK(ifp);
3380 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
3381 if (sdl == NULL) {
3382 ifa_free(ifa);
3383 return (EINVAL);
3384 }
3385 if (len != sdl->sdl_alen) { /* don't allow length to change */
3386 ifa_free(ifa);
3387 return (EINVAL);
3388 }
3389 switch (ifp->if_type) {
3390 case IFT_ETHER:
3391 case IFT_FDDI:
3392 case IFT_XETHER:
3393 case IFT_ISO88025:
3394 case IFT_L2VLAN:
3395 case IFT_BRIDGE:
3396 case IFT_ARCNET:
3397 case IFT_IEEE8023ADLAG:
3398 case IFT_IEEE80211:
3399 bcopy(lladdr, LLADDR(sdl), len);
3400 ifa_free(ifa);
3401 break;
3402 default:
3403 ifa_free(ifa);
3404 return (ENODEV);
3405 }
3406
3407 /*
3408 * If the interface is already up, we need
3409 * to re-init it in order to reprogram its
3410 * address filter.
3411 */
3412 if ((ifp->if_flags & IFF_UP) != 0) {
3413 if (ifp->if_ioctl) {
3414 ifp->if_flags &= ~IFF_UP;
3415 ifr.ifr_flags = ifp->if_flags & 0xffff;
3416 ifr.ifr_flagshigh = ifp->if_flags >> 16;
3417 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
3418 ifp->if_flags |= IFF_UP;
3419 ifr.ifr_flags = ifp->if_flags & 0xffff;
3420 ifr.ifr_flagshigh = ifp->if_flags >> 16;
3421 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
3422 }
3423 #ifdef INET
3424 /*
3425 * Also send gratuitous ARPs to notify other nodes about
3426 * the address change.
3427 */
3428 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
3429 if (ifa->ifa_addr->sa_family == AF_INET)
3430 arp_ifinit(ifp, ifa);
3431 }
3432 #endif
3433 }
3434 return (0);
3435 }
3436
3437 /*
3438 * The name argument must be a pointer to storage which will last as
3439 * long as the interface does. For physical devices, the result of
3440 * device_get_name(dev) is a good choice and for pseudo-devices a
3441 * static string works well.
3442 */
3443 void
if_initname(struct ifnet * ifp,const char * name,int unit)3444 if_initname(struct ifnet *ifp, const char *name, int unit)
3445 {
3446 ifp->if_dname = name;
3447 ifp->if_dunit = unit;
3448 if (unit != IF_DUNIT_NONE)
3449 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit);
3450 else
3451 strlcpy(ifp->if_xname, name, IFNAMSIZ);
3452 }
3453
3454 int
if_printf(struct ifnet * ifp,const char * fmt,...)3455 if_printf(struct ifnet *ifp, const char * fmt, ...)
3456 {
3457 va_list ap;
3458 int retval;
3459
3460 retval = printf("%s: ", ifp->if_xname);
3461 va_start(ap, fmt);
3462 retval += vprintf(fmt, ap);
3463 va_end(ap);
3464 return (retval);
3465 }
3466
3467 void
if_start(struct ifnet * ifp)3468 if_start(struct ifnet *ifp)
3469 {
3470
3471 (*(ifp)->if_start)(ifp);
3472 }
3473
3474 /*
3475 * Backwards compatibility interface for drivers
3476 * that have not implemented it
3477 */
3478 static int
if_transmit(struct ifnet * ifp,struct mbuf * m)3479 if_transmit(struct ifnet *ifp, struct mbuf *m)
3480 {
3481 int error;
3482
3483 IFQ_HANDOFF(ifp, m, error);
3484 return (error);
3485 }
3486
3487 static void
if_input_default(struct ifnet * ifp __unused,struct mbuf * m)3488 if_input_default(struct ifnet *ifp __unused, struct mbuf *m)
3489 {
3490
3491 m_freem(m);
3492 }
3493
3494 int
if_handoff(struct ifqueue * ifq,struct mbuf * m,struct ifnet * ifp,int adjust)3495 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust)
3496 {
3497 int active = 0;
3498
3499 IF_LOCK(ifq);
3500 if (_IF_QFULL(ifq)) {
3501 _IF_DROP(ifq);
3502 IF_UNLOCK(ifq);
3503 m_freem(m);
3504 return (0);
3505 }
3506 if (ifp != NULL) {
3507 ifp->if_obytes += m->m_pkthdr.len + adjust;
3508 if (m->m_flags & (M_BCAST|M_MCAST))
3509 ifp->if_omcasts++;
3510 active = ifp->if_drv_flags & IFF_DRV_OACTIVE;
3511 }
3512 _IF_ENQUEUE(ifq, m);
3513 IF_UNLOCK(ifq);
3514 if (ifp != NULL && !active)
3515 (*(ifp)->if_start)(ifp);
3516 return (1);
3517 }
3518
3519 void
if_register_com_alloc(u_char type,if_com_alloc_t * a,if_com_free_t * f)3520 if_register_com_alloc(u_char type,
3521 if_com_alloc_t *a, if_com_free_t *f)
3522 {
3523
3524 KASSERT(if_com_alloc[type] == NULL,
3525 ("if_register_com_alloc: %d already registered", type));
3526 KASSERT(if_com_free[type] == NULL,
3527 ("if_register_com_alloc: %d free already registered", type));
3528
3529 if_com_alloc[type] = a;
3530 if_com_free[type] = f;
3531 }
3532
3533 void
if_deregister_com_alloc(u_char type)3534 if_deregister_com_alloc(u_char type)
3535 {
3536
3537 KASSERT(if_com_alloc[type] != NULL,
3538 ("if_deregister_com_alloc: %d not registered", type));
3539 KASSERT(if_com_free[type] != NULL,
3540 ("if_deregister_com_alloc: %d free not registered", type));
3541 if_com_alloc[type] = NULL;
3542 if_com_free[type] = NULL;
3543 }
3544