Fix whitespace.
[dragonfly.git] / sys / net / if.c
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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 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)if.c 8.3 (Berkeley) 1/4/94
1fdf0954 34 * $FreeBSD: src/sys/net/if.c,v 1.185 2004/03/13 02:35:03 brooks Exp $
abbb44bb 35 * $DragonFly: src/sys/net/if.c,v 1.22 2004/09/15 19:34:55 joerg Exp $
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36 */
37
38#include "opt_compat.h"
39#include "opt_inet6.h"
40#include "opt_inet.h"
41
42#include <sys/param.h>
43#include <sys/malloc.h>
44#include <sys/mbuf.h>
45#include <sys/systm.h>
46#include <sys/proc.h>
6b6e0885 47#include <sys/protosw.h>
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48#include <sys/socket.h>
49#include <sys/socketvar.h>
6b6e0885 50#include <sys/socketops.h>
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51#include <sys/protosw.h>
52#include <sys/kernel.h>
53#include <sys/sockio.h>
54#include <sys/syslog.h>
55#include <sys/sysctl.h>
56
57#include <net/if.h>
58#include <net/if_arp.h>
59#include <net/if_dl.h>
60#include <net/if_types.h>
61#include <net/if_var.h>
62#include <net/radix.h>
63#include <net/route.h>
64#include <machine/stdarg.h>
65
66#if defined(INET) || defined(INET6)
67/*XXX*/
68#include <netinet/in.h>
69#include <netinet/in_var.h>
70#include <netinet/if_ether.h>
71#ifdef INET6
72#include <machine/clock.h> /* XXX: temporal workaround for fxp issue */
73#include <netinet6/in6_var.h>
74#include <netinet6/in6_ifattach.h>
75#endif
76#endif
77
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78#if defined(COMPAT_43)
79#include <emulation/43bsd/43bsd_socket.h>
80#endif /* COMPAT_43 */
81
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82/*
83 * System initialization
84 */
85
61b8d551 86static int ifconf (u_long, caddr_t, struct thread *);
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87static void ifinit (void *);
88static void if_qflush (struct ifqueue *);
89static void if_slowtimo (void *);
90static void link_rtrequest (int, struct rtentry *, struct rt_addrinfo *);
91static int if_rtdel (struct radix_node *, void *);
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92
93SYSINIT(interfaces, SI_SUB_PROTO_IF, SI_ORDER_FIRST, ifinit, NULL)
94
95MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address");
96MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address");
b7b982e2 97MALLOC_DEFINE(M_CLONE, "clone", "interface cloning framework");
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98
99int ifqmaxlen = IFQ_MAXLEN;
100struct ifnethead ifnet; /* depend on static init XXX */
101
102#ifdef INET6
103/*
104 * XXX: declare here to avoid to include many inet6 related files..
105 * should be more generalized?
106 */
158abb01 107extern void nd6_setmtu (struct ifnet *);
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108#endif
109
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110struct if_clone *if_clone_lookup (const char *, int *);
111int if_clone_list (struct if_clonereq *);
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112
113LIST_HEAD(, if_clone) if_cloners = LIST_HEAD_INITIALIZER(if_cloners);
114int if_cloners_count;
115
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116struct callout if_slowtimo_timer;
117
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118/*
119 * Network interface utility routines.
120 *
121 * Routines with ifa_ifwith* names take sockaddr *'s as
122 * parameters.
123 */
124/* ARGSUSED*/
125void
126ifinit(dummy)
127 void *dummy;
128{
129 struct ifnet *ifp;
130 int s;
131
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132 callout_init(&if_slowtimo_timer);
133
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134 s = splimp();
135 TAILQ_FOREACH(ifp, &ifnet, if_link) {
136 if (ifp->if_snd.ifq_maxlen == 0) {
3e4a09e7 137 if_printf(ifp, "XXX: driver didn't set ifq_maxlen\n");
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138 ifp->if_snd.ifq_maxlen = ifqmaxlen;
139 }
140 }
141 splx(s);
abbb44bb 142
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143 if_slowtimo(0);
144}
145
146int if_index = 0;
147struct ifaddr **ifnet_addrs;
148struct ifnet **ifindex2ifnet = NULL;
149
150
151/*
152 * Attach an interface to the
153 * list of "active" interfaces.
154 */
155void
156if_attach(ifp)
157 struct ifnet *ifp;
158{
159 unsigned socksize, ifasize;
160 int namelen, masklen;
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161 struct sockaddr_dl *sdl;
162 struct ifaddr *ifa;
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163 static int if_indexlim = 8;
164 static int inited;
165
166 if (!inited) {
167 TAILQ_INIT(&ifnet);
168 inited = 1;
169 }
170
171 TAILQ_INSERT_TAIL(&ifnet, ifp, if_link);
172 ifp->if_index = ++if_index;
173 /*
174 * XXX -
175 * The old code would work if the interface passed a pre-existing
176 * chain of ifaddrs to this code. We don't trust our callers to
177 * properly initialize the tailq, however, so we no longer allow
178 * this unlikely case.
179 */
180 TAILQ_INIT(&ifp->if_addrhead);
181 TAILQ_INIT(&ifp->if_prefixhead);
182 LIST_INIT(&ifp->if_multiaddrs);
183 getmicrotime(&ifp->if_lastchange);
184 if (ifnet_addrs == 0 || if_index >= if_indexlim) {
185 unsigned n = (if_indexlim <<= 1) * sizeof(ifa);
186 caddr_t q = malloc(n, M_IFADDR, M_WAITOK);
187 bzero(q, n);
188 if (ifnet_addrs) {
189 bcopy((caddr_t)ifnet_addrs, (caddr_t)q, n/2);
190 free((caddr_t)ifnet_addrs, M_IFADDR);
191 }
192 ifnet_addrs = (struct ifaddr **)q;
193
194 /* grow ifindex2ifnet */
195 n = if_indexlim * sizeof(struct ifnet *);
196 q = malloc(n, M_IFADDR, M_WAITOK);
197 bzero(q, n);
198 if (ifindex2ifnet) {
199 bcopy((caddr_t)ifindex2ifnet, q, n/2);
200 free((caddr_t)ifindex2ifnet, M_IFADDR);
201 }
202 ifindex2ifnet = (struct ifnet **)q;
203 }
204
205 ifindex2ifnet[if_index] = ifp;
206
207 /*
208 * create a Link Level name for this device
209 */
3e4a09e7 210 namelen = strlen(ifp->if_xname);
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211#define _offsetof(t, m) ((int)((caddr_t)&((t *)0)->m))
212 masklen = _offsetof(struct sockaddr_dl, sdl_data[0]) + namelen;
213 socksize = masklen + ifp->if_addrlen;
214#define ROUNDUP(a) (1 + (((a) - 1) | (sizeof(long) - 1)))
215 if (socksize < sizeof(*sdl))
216 socksize = sizeof(*sdl);
217 socksize = ROUNDUP(socksize);
218 ifasize = sizeof(*ifa) + 2 * socksize;
219 ifa = (struct ifaddr *)malloc(ifasize, M_IFADDR, M_WAITOK);
220 if (ifa) {
221 bzero((caddr_t)ifa, ifasize);
222 sdl = (struct sockaddr_dl *)(ifa + 1);
223 sdl->sdl_len = socksize;
224 sdl->sdl_family = AF_LINK;
3e4a09e7 225 bcopy(ifp->if_xname, sdl->sdl_data, namelen);
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226 sdl->sdl_nlen = namelen;
227 sdl->sdl_index = ifp->if_index;
228 sdl->sdl_type = ifp->if_type;
229 ifnet_addrs[if_index - 1] = ifa;
230 ifa->ifa_ifp = ifp;
231 ifa->ifa_rtrequest = link_rtrequest;
232 ifa->ifa_addr = (struct sockaddr *)sdl;
233 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl);
234 ifa->ifa_netmask = (struct sockaddr *)sdl;
235 sdl->sdl_len = masklen;
236 while (namelen != 0)
237 sdl->sdl_data[--namelen] = 0xff;
238 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link);
239 }
240
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241 EVENTHANDLER_INVOKE(ifnet_attach_event, ifp);
242
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243 /* Announce the interface. */
244 rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
245}
246
247/*
248 * Detach an interface, removing it from the
249 * list of "active" interfaces.
250 */
251void
252if_detach(ifp)
253 struct ifnet *ifp;
254{
255 struct ifaddr *ifa;
256 struct radix_node_head *rnh;
257 int s;
258 int i;
259
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260 EVENTHANDLER_INVOKE(ifnet_detach_event, ifp);
261
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262 /*
263 * Remove routes and flush queues.
264 */
265 s = splnet();
266 if_down(ifp);
267
268 /*
269 * Remove address from ifnet_addrs[] and maybe decrement if_index.
270 * Clean up all addresses.
271 */
272 ifnet_addrs[ifp->if_index - 1] = 0;
273 while (if_index > 0 && ifnet_addrs[if_index - 1] == 0)
274 if_index--;
275
276 for (ifa = TAILQ_FIRST(&ifp->if_addrhead); ifa;
277 ifa = TAILQ_FIRST(&ifp->if_addrhead)) {
278#ifdef INET
279 /* XXX: Ugly!! ad hoc just for INET */
280 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET) {
281 struct ifaliasreq ifr;
282
283 bzero(&ifr, sizeof(ifr));
284 ifr.ifra_addr = *ifa->ifa_addr;
285 if (ifa->ifa_dstaddr)
286 ifr.ifra_broadaddr = *ifa->ifa_dstaddr;
287 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp,
288 NULL) == 0)
289 continue;
290 }
291#endif /* INET */
292#ifdef INET6
293 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET6) {
294 in6_purgeaddr(ifa);
295 /* ifp_addrhead is already updated */
296 continue;
297 }
298#endif /* INET6 */
299 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link);
300 IFAFREE(ifa);
301 }
302
303#ifdef INET6
304 /*
305 * Remove all IPv6 kernel structs related to ifp. This should be done
306 * before removing routing entries below, since IPv6 interface direct
307 * routes are expected to be removed by the IPv6-specific kernel API.
308 * Otherwise, the kernel will detect some inconsistency and bark it.
309 */
310 in6_ifdetach(ifp);
311#endif
312
313 /*
314 * Delete all remaining routes using this interface
315 * Unfortuneatly the only way to do this is to slog through
316 * the entire routing table looking for routes which point
317 * to this interface...oh well...
318 */
319 for (i = 1; i <= AF_MAX; i++) {
320 if ((rnh = rt_tables[i]) == NULL)
321 continue;
322 (void) rnh->rnh_walktree(rnh, if_rtdel, ifp);
323 }
324
325 /* Announce that the interface is gone. */
326 rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
327
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328 ifindex2ifnet[ifp->if_index] = NULL;
329
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330 TAILQ_REMOVE(&ifnet, ifp, if_link);
331 splx(s);
332}
333
334/*
335 * Delete Routes for a Network Interface
336 *
337 * Called for each routing entry via the rnh->rnh_walktree() call above
338 * to delete all route entries referencing a detaching network interface.
339 *
340 * Arguments:
341 * rn pointer to node in the routing table
342 * arg argument passed to rnh->rnh_walktree() - detaching interface
343 *
344 * Returns:
345 * 0 successful
346 * errno failed - reason indicated
347 *
348 */
349static int
350if_rtdel(rn, arg)
351 struct radix_node *rn;
352 void *arg;
353{
354 struct rtentry *rt = (struct rtentry *)rn;
355 struct ifnet *ifp = arg;
356 int err;
357
358 if (rt->rt_ifp == ifp) {
359
360 /*
361 * Protect (sorta) against walktree recursion problems
362 * with cloned routes
363 */
364 if ((rt->rt_flags & RTF_UP) == 0)
365 return (0);
366
367 err = rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway,
368 rt_mask(rt), rt->rt_flags,
369 (struct rtentry **) NULL);
370 if (err) {
371 log(LOG_WARNING, "if_rtdel: error %d\n", err);
372 }
373 }
374
375 return (0);
376}
377
378/*
379 * Create a clone network interface.
380 */
381int
382if_clone_create(name, len)
383 char *name;
384 int len;
385{
386 struct if_clone *ifc;
387 char *dp;
b7b982e2 388 int wildcard, bytoff, bitoff;
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389 int unit;
390 int err;
391
392 ifc = if_clone_lookup(name, &unit);
393 if (ifc == NULL)
394 return (EINVAL);
395
396 if (ifunit(name) != NULL)
397 return (EEXIST);
398
b7b982e2 399 bytoff = bitoff = 0;
984263bc 400 wildcard = (unit < 0);
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401 /*
402 * Find a free unit if none was given.
403 */
404 if (wildcard) {
405 while ((bytoff < ifc->ifc_bmlen)
406 && (ifc->ifc_units[bytoff] == 0xff))
407 bytoff++;
408 if (bytoff >= ifc->ifc_bmlen)
409 return (ENOSPC);
410 while ((ifc->ifc_units[bytoff] & (1 << bitoff)) != 0)
411 bitoff++;
412 unit = (bytoff << 3) + bitoff;
413 }
984263bc 414
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415 if (unit > ifc->ifc_maxunit)
416 return (ENXIO);
417
418 err = (*ifc->ifc_create)(ifc, unit);
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419 if (err != 0)
420 return (err);
421
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422 if (!wildcard) {
423 bytoff = unit >> 3;
424 bitoff = unit - (bytoff << 3);
425 }
426
427 /*
428 * Allocate the unit in the bitmap.
429 */
430 KASSERT((ifc->ifc_units[bytoff] & (1 << bitoff)) == 0,
431 ("%s: bit is already set", __func__));
432 ifc->ifc_units[bytoff] |= (1 << bitoff);
433
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434 /* In the wildcard case, we need to update the name. */
435 if (wildcard) {
436 for (dp = name; *dp != '\0'; dp++);
437 if (snprintf(dp, len - (dp-name), "%d", unit) >
438 len - (dp-name) - 1) {
439 /*
440 * This can only be a programmer error and
441 * there's no straightforward way to recover if
442 * it happens.
443 */
444 panic("if_clone_create(): interface name too long");
445 }
b7b982e2 446
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447 }
448
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449 EVENTHANDLER_INVOKE(if_clone_event, ifc);
450
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451 return (0);
452}
453
454/*
455 * Destroy a clone network interface.
456 */
457int
458if_clone_destroy(name)
459 const char *name;
460{
461 struct if_clone *ifc;
462 struct ifnet *ifp;
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463 int bytoff, bitoff;
464 int unit;
984263bc 465
b7b982e2 466 ifc = if_clone_lookup(name, &unit);
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467 if (ifc == NULL)
468 return (EINVAL);
469
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470 if (unit < ifc->ifc_minifs)
471 return (EINVAL);
472
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473 ifp = ifunit(name);
474 if (ifp == NULL)
475 return (ENXIO);
476
477 if (ifc->ifc_destroy == NULL)
478 return (EOPNOTSUPP);
479
480 (*ifc->ifc_destroy)(ifp);
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481
482 /*
483 * Compute offset in the bitmap and deallocate the unit.
484 */
485 bytoff = unit >> 3;
486 bitoff = unit - (bytoff << 3);
487 KASSERT((ifc->ifc_units[bytoff] & (1 << bitoff)) != 0,
488 ("%s: bit is already cleared", __func__));
489 ifc->ifc_units[bytoff] &= ~(1 << bitoff);
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490 return (0);
491}
492
493/*
494 * Look up a network interface cloner.
495 */
496struct if_clone *
497if_clone_lookup(name, unitp)
498 const char *name;
499 int *unitp;
500{
501 struct if_clone *ifc;
502 const char *cp;
503 int i;
504
505 for (ifc = LIST_FIRST(&if_cloners); ifc != NULL;) {
506 for (cp = name, i = 0; i < ifc->ifc_namelen; i++, cp++) {
507 if (ifc->ifc_name[i] != *cp)
508 goto next_ifc;
509 }
510 goto found_name;
511 next_ifc:
512 ifc = LIST_NEXT(ifc, ifc_list);
513 }
514
515 /* No match. */
516 return ((struct if_clone *)NULL);
517
518 found_name:
519 if (*cp == '\0') {
520 i = -1;
521 } else {
522 for (i = 0; *cp != '\0'; cp++) {
523 if (*cp < '0' || *cp > '9') {
524 /* Bogus unit number. */
525 return (NULL);
526 }
527 i = (i * 10) + (*cp - '0');
528 }
529 }
530
531 if (unitp != NULL)
532 *unitp = i;
533 return (ifc);
534}
535
536/*
537 * Register a network interface cloner.
538 */
539void
540if_clone_attach(ifc)
541 struct if_clone *ifc;
542{
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543 int bytoff, bitoff;
544 int err;
545 int len, maxclone;
546 int unit;
547
548 KASSERT(ifc->ifc_minifs - 1 <= ifc->ifc_maxunit,
549 ("%s: %s requested more units then allowed (%d > %d)",
550 __func__, ifc->ifc_name, ifc->ifc_minifs,
551 ifc->ifc_maxunit + 1));
552 /*
553 * Compute bitmap size and allocate it.
554 */
555 maxclone = ifc->ifc_maxunit + 1;
556 len = maxclone >> 3;
557 if ((len << 3) < maxclone)
558 len++;
559 ifc->ifc_units = malloc(len, M_CLONE, M_WAITOK | M_ZERO);
560 ifc->ifc_bmlen = len;
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561
562 LIST_INSERT_HEAD(&if_cloners, ifc, ifc_list);
563 if_cloners_count++;
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564
565 for (unit = 0; unit < ifc->ifc_minifs; unit++) {
566 err = (*ifc->ifc_create)(ifc, unit);
567 KASSERT(err == 0,
568 ("%s: failed to create required interface %s%d",
569 __func__, ifc->ifc_name, unit));
570
571 /* Allocate the unit in the bitmap. */
572 bytoff = unit >> 3;
573 bitoff = unit - (bytoff << 3);
574 ifc->ifc_units[bytoff] |= (1 << bitoff);
575 }
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576}
577
578/*
579 * Unregister a network interface cloner.
580 */
581void
582if_clone_detach(ifc)
583 struct if_clone *ifc;
584{
585
586 LIST_REMOVE(ifc, ifc_list);
b7b982e2 587 free(ifc->ifc_units, M_CLONE);
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588 if_cloners_count--;
589}
590
591/*
592 * Provide list of interface cloners to userspace.
593 */
594int
595if_clone_list(ifcr)
596 struct if_clonereq *ifcr;
597{
598 char outbuf[IFNAMSIZ], *dst;
599 struct if_clone *ifc;
600 int count, error = 0;
601
602 ifcr->ifcr_total = if_cloners_count;
603 if ((dst = ifcr->ifcr_buffer) == NULL) {
604 /* Just asking how many there are. */
605 return (0);
606 }
607
608 if (ifcr->ifcr_count < 0)
609 return (EINVAL);
610
611 count = (if_cloners_count < ifcr->ifcr_count) ?
612 if_cloners_count : ifcr->ifcr_count;
613
614 for (ifc = LIST_FIRST(&if_cloners); ifc != NULL && count != 0;
615 ifc = LIST_NEXT(ifc, ifc_list), count--, dst += IFNAMSIZ) {
3e4a09e7 616 strlcpy(outbuf, ifc->ifc_name, IFNAMSIZ);
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617 error = copyout(outbuf, dst, IFNAMSIZ);
618 if (error)
619 break;
620 }
621
622 return (error);
623}
624
625/*
626 * Locate an interface based on a complete address.
627 */
628/*ARGSUSED*/
629struct ifaddr *
630ifa_ifwithaddr(addr)
82ed7fc2 631 struct sockaddr *addr;
984263bc 632{
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633 struct ifnet *ifp;
634 struct ifaddr *ifa;
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635
636#define equal(a1, a2) \
637 (bcmp((caddr_t)(a1), (caddr_t)(a2), ((struct sockaddr *)(a1))->sa_len) == 0)
638 TAILQ_FOREACH(ifp, &ifnet, if_link)
639 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
640 if (ifa->ifa_addr->sa_family != addr->sa_family)
641 continue;
642 if (equal(addr, ifa->ifa_addr))
643 return (ifa);
644 if ((ifp->if_flags & IFF_BROADCAST) && ifa->ifa_broadaddr &&
645 /* IP6 doesn't have broadcast */
646 ifa->ifa_broadaddr->sa_len != 0 &&
647 equal(ifa->ifa_broadaddr, addr))
648 return (ifa);
649 }
650 return ((struct ifaddr *)0);
651}
652/*
653 * Locate the point to point interface with a given destination address.
654 */
655/*ARGSUSED*/
656struct ifaddr *
657ifa_ifwithdstaddr(addr)
82ed7fc2 658 struct sockaddr *addr;
984263bc 659{
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660 struct ifnet *ifp;
661 struct ifaddr *ifa;
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662
663 TAILQ_FOREACH(ifp, &ifnet, if_link)
664 if (ifp->if_flags & IFF_POINTOPOINT)
665 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
666 if (ifa->ifa_addr->sa_family != addr->sa_family)
667 continue;
668 if (ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr))
669 return (ifa);
670 }
671 return ((struct ifaddr *)0);
672}
673
674/*
675 * Find an interface on a specific network. If many, choice
676 * is most specific found.
677 */
678struct ifaddr *
679ifa_ifwithnet(addr)
680 struct sockaddr *addr;
681{
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682 struct ifnet *ifp;
683 struct ifaddr *ifa;
984263bc
MD
684 struct ifaddr *ifa_maybe = (struct ifaddr *) 0;
685 u_int af = addr->sa_family;
686 char *addr_data = addr->sa_data, *cplim;
687
688 /*
689 * AF_LINK addresses can be looked up directly by their index number,
690 * so do that if we can.
691 */
692 if (af == AF_LINK) {
82ed7fc2 693 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr;
984263bc
MD
694 if (sdl->sdl_index && sdl->sdl_index <= if_index)
695 return (ifnet_addrs[sdl->sdl_index - 1]);
696 }
697
698 /*
699 * Scan though each interface, looking for ones that have
700 * addresses in this address family.
701 */
702 TAILQ_FOREACH(ifp, &ifnet, if_link) {
703 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
82ed7fc2 704 char *cp, *cp2, *cp3;
984263bc
MD
705
706 if (ifa->ifa_addr->sa_family != af)
707next: continue;
708 if (af == AF_INET && ifp->if_flags & IFF_POINTOPOINT) {
709 /*
710 * This is a bit broken as it doesn't
711 * take into account that the remote end may
712 * be a single node in the network we are
713 * looking for.
714 * The trouble is that we don't know the
715 * netmask for the remote end.
716 */
717 if (ifa->ifa_dstaddr != 0
718 && equal(addr, ifa->ifa_dstaddr))
719 return (ifa);
720 } else {
721 /*
722 * if we have a special address handler,
723 * then use it instead of the generic one.
724 */
725 if (ifa->ifa_claim_addr) {
726 if ((*ifa->ifa_claim_addr)(ifa, addr)) {
727 return (ifa);
728 } else {
729 continue;
730 }
731 }
732
733 /*
734 * Scan all the bits in the ifa's address.
735 * If a bit dissagrees with what we are
736 * looking for, mask it with the netmask
737 * to see if it really matters.
738 * (A byte at a time)
739 */
740 if (ifa->ifa_netmask == 0)
741 continue;
742 cp = addr_data;
743 cp2 = ifa->ifa_addr->sa_data;
744 cp3 = ifa->ifa_netmask->sa_data;
745 cplim = ifa->ifa_netmask->sa_len
746 + (char *)ifa->ifa_netmask;
747 while (cp3 < cplim)
748 if ((*cp++ ^ *cp2++) & *cp3++)
749 goto next; /* next address! */
750 /*
751 * If the netmask of what we just found
752 * is more specific than what we had before
753 * (if we had one) then remember the new one
754 * before continuing to search
755 * for an even better one.
756 */
757 if (ifa_maybe == 0 ||
758 rn_refines((caddr_t)ifa->ifa_netmask,
759 (caddr_t)ifa_maybe->ifa_netmask))
760 ifa_maybe = ifa;
761 }
762 }
763 }
764 return (ifa_maybe);
765}
766
767/*
768 * Find an interface address specific to an interface best matching
769 * a given address.
770 */
771struct ifaddr *
772ifaof_ifpforaddr(addr, ifp)
773 struct sockaddr *addr;
82ed7fc2 774 struct ifnet *ifp;
984263bc 775{
82ed7fc2
RG
776 struct ifaddr *ifa;
777 char *cp, *cp2, *cp3;
778 char *cplim;
984263bc
MD
779 struct ifaddr *ifa_maybe = 0;
780 u_int af = addr->sa_family;
781
782 if (af >= AF_MAX)
783 return (0);
784 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
785 if (ifa->ifa_addr->sa_family != af)
786 continue;
787 if (ifa_maybe == 0)
788 ifa_maybe = ifa;
789 if (ifa->ifa_netmask == 0) {
790 if (equal(addr, ifa->ifa_addr) ||
791 (ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr)))
792 return (ifa);
793 continue;
794 }
795 if (ifp->if_flags & IFF_POINTOPOINT) {
796 if (equal(addr, ifa->ifa_dstaddr))
797 return (ifa);
798 } else {
799 cp = addr->sa_data;
800 cp2 = ifa->ifa_addr->sa_data;
801 cp3 = ifa->ifa_netmask->sa_data;
802 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask;
803 for (; cp3 < cplim; cp3++)
804 if ((*cp++ ^ *cp2++) & *cp3)
805 break;
806 if (cp3 == cplim)
807 return (ifa);
808 }
809 }
810 return (ifa_maybe);
811}
812
813#include <net/route.h>
814
815/*
816 * Default action when installing a route with a Link Level gateway.
817 * Lookup an appropriate real ifa to point to.
818 * This should be moved to /sys/net/link.c eventually.
819 */
820static void
821link_rtrequest(cmd, rt, info)
822 int cmd;
82ed7fc2 823 struct rtentry *rt;
984263bc
MD
824 struct rt_addrinfo *info;
825{
82ed7fc2 826 struct ifaddr *ifa;
984263bc
MD
827 struct sockaddr *dst;
828 struct ifnet *ifp;
829
830 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) ||
831 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0))
832 return;
833 ifa = ifaof_ifpforaddr(dst, ifp);
834 if (ifa) {
835 IFAFREE(rt->rt_ifa);
836 rt->rt_ifa = ifa;
837 ifa->ifa_refcnt++;
838 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest)
839 ifa->ifa_rtrequest(cmd, rt, info);
840 }
841}
842
843/*
844 * Mark an interface down and notify protocols of
845 * the transition.
846 * NOTE: must be called at splnet or eqivalent.
847 */
848void
849if_unroute(ifp, flag, fam)
82ed7fc2 850 struct ifnet *ifp;
984263bc
MD
851 int flag, fam;
852{
82ed7fc2 853 struct ifaddr *ifa;
984263bc
MD
854
855 ifp->if_flags &= ~flag;
856 getmicrotime(&ifp->if_lastchange);
857 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
858 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family))
859 pfctlinput(PRC_IFDOWN, ifa->ifa_addr);
860 if_qflush(&ifp->if_snd);
861 rt_ifmsg(ifp);
862}
863
864/*
865 * Mark an interface up and notify protocols of
866 * the transition.
867 * NOTE: must be called at splnet or eqivalent.
868 */
869void
870if_route(ifp, flag, fam)
82ed7fc2 871 struct ifnet *ifp;
984263bc
MD
872 int flag, fam;
873{
82ed7fc2 874 struct ifaddr *ifa;
984263bc
MD
875
876 ifp->if_flags |= flag;
877 getmicrotime(&ifp->if_lastchange);
878 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
879 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family))
880 pfctlinput(PRC_IFUP, ifa->ifa_addr);
881 rt_ifmsg(ifp);
882#ifdef INET6
883 in6_if_up(ifp);
884#endif
885}
886
887/*
888 * Mark an interface down and notify protocols of
889 * the transition.
890 * NOTE: must be called at splnet or eqivalent.
891 */
892void
893if_down(ifp)
82ed7fc2 894 struct ifnet *ifp;
984263bc
MD
895{
896
897 if_unroute(ifp, IFF_UP, AF_UNSPEC);
898}
899
900/*
901 * Mark an interface up and notify protocols of
902 * the transition.
903 * NOTE: must be called at splnet or eqivalent.
904 */
905void
906if_up(ifp)
82ed7fc2 907 struct ifnet *ifp;
984263bc
MD
908{
909
910 if_route(ifp, IFF_UP, AF_UNSPEC);
911}
912
913/*
914 * Flush an interface queue.
915 */
916static void
917if_qflush(ifq)
82ed7fc2 918 struct ifqueue *ifq;
984263bc 919{
82ed7fc2 920 struct mbuf *m, *n;
984263bc
MD
921
922 n = ifq->ifq_head;
923 while ((m = n) != 0) {
9a275e74 924 n = m->m_nextpkt;
984263bc
MD
925 m_freem(m);
926 }
927 ifq->ifq_head = 0;
928 ifq->ifq_tail = 0;
929 ifq->ifq_len = 0;
930}
931
932/*
933 * Handle interface watchdog timer routines. Called
934 * from softclock, we decrement timers (if set) and
935 * call the appropriate interface routine on expiration.
936 */
937static void
938if_slowtimo(arg)
939 void *arg;
940{
82ed7fc2 941 struct ifnet *ifp;
984263bc
MD
942 int s = splimp();
943
944 TAILQ_FOREACH(ifp, &ifnet, if_link) {
945 if (ifp->if_timer == 0 || --ifp->if_timer)
946 continue;
947 if (ifp->if_watchdog)
948 (*ifp->if_watchdog)(ifp);
949 }
950 splx(s);
abbb44bb 951 callout_reset(&if_slowtimo_timer, hz / IFNET_SLOWHZ, if_slowtimo, NULL);
984263bc
MD
952}
953
954/*
955 * Map interface name to
956 * interface structure pointer.
957 */
958struct ifnet *
959ifunit(const char *name)
960{
984263bc 961 struct ifnet *ifp;
984263bc 962
984263bc 963 /*
3e4a09e7 964 * Search all the interfaces for this name/number
984263bc 965 */
3e4a09e7 966
984263bc 967 TAILQ_FOREACH(ifp, &ifnet, if_link) {
3e4a09e7 968 if (strncmp(ifp->if_xname, name, IFNAMSIZ) == 0)
984263bc
MD
969 break;
970 }
971 return (ifp);
972}
973
974
975/*
976 * Map interface name in a sockaddr_dl to
977 * interface structure pointer.
978 */
979struct ifnet *
980if_withname(sa)
981 struct sockaddr *sa;
982{
983 char ifname[IFNAMSIZ+1];
984 struct sockaddr_dl *sdl = (struct sockaddr_dl *)sa;
985
986 if ( (sa->sa_family != AF_LINK) || (sdl->sdl_nlen == 0) ||
987 (sdl->sdl_nlen > IFNAMSIZ) )
988 return NULL;
989
990 /*
991 * ifunit wants a null-terminated name. It may not be null-terminated
992 * in the sockaddr. We don't want to change the caller's sockaddr,
993 * and there might not be room to put the trailing null anyway, so we
994 * make a local copy that we know we can null terminate safely.
995 */
996
997 bcopy(sdl->sdl_data, ifname, sdl->sdl_nlen);
998 ifname[sdl->sdl_nlen] = '\0';
999 return ifunit(ifname);
1000}
1001
1002
1003/*
1004 * Interface ioctls.
1005 */
1006int
dadab5e9 1007ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td)
984263bc 1008{
41c20dac
MD
1009 struct ifnet *ifp;
1010 struct ifreq *ifr;
984263bc
MD
1011 struct ifstat *ifs;
1012 int error;
1013 short oif_flags;
1014 int new_flags;
1fdf0954
HP
1015 size_t namelen, onamelen;
1016 char new_name[IFNAMSIZ];
1017 struct ifaddr *ifa;
1018 struct sockaddr_dl *sdl;
984263bc
MD
1019
1020 switch (cmd) {
1021
1022 case SIOCGIFCONF:
1023 case OSIOCGIFCONF:
61b8d551 1024 return (ifconf(cmd, data, td));
984263bc
MD
1025 }
1026 ifr = (struct ifreq *)data;
1027
1028 switch (cmd) {
1029 case SIOCIFCREATE:
1030 case SIOCIFDESTROY:
dadab5e9 1031 if ((error = suser(td)) != 0)
984263bc
MD
1032 return (error);
1033 return ((cmd == SIOCIFCREATE) ?
1034 if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name)) :
1035 if_clone_destroy(ifr->ifr_name));
1036
1037 case SIOCIFGCLONERS:
1038 return (if_clone_list((struct if_clonereq *)data));
1039 }
1040
1041 ifp = ifunit(ifr->ifr_name);
1042 if (ifp == 0)
1043 return (ENXIO);
1044 switch (cmd) {
1045
1046 case SIOCGIFFLAGS:
1047 ifr->ifr_flags = ifp->if_flags;
46f25451 1048 ifr->ifr_flagshigh = ifp->if_flags >> 16;
984263bc
MD
1049 break;
1050
1051 case SIOCGIFCAP:
1052 ifr->ifr_reqcap = ifp->if_capabilities;
1053 ifr->ifr_curcap = ifp->if_capenable;
1054 break;
1055
1056 case SIOCGIFMETRIC:
1057 ifr->ifr_metric = ifp->if_metric;
1058 break;
1059
1060 case SIOCGIFMTU:
1061 ifr->ifr_mtu = ifp->if_mtu;
1062 break;
1063
1064 case SIOCGIFPHYS:
1065 ifr->ifr_phys = ifp->if_physical;
1066 break;
1067
1068 case SIOCSIFFLAGS:
dadab5e9 1069 error = suser(td);
984263bc
MD
1070 if (error)
1071 return (error);
1072 new_flags = (ifr->ifr_flags & 0xffff) |
1073 (ifr->ifr_flagshigh << 16);
1074 if (ifp->if_flags & IFF_SMART) {
1075 /* Smart drivers twiddle their own routes */
1076 } else if (ifp->if_flags & IFF_UP &&
1077 (new_flags & IFF_UP) == 0) {
1078 int s = splimp();
1079 if_down(ifp);
1080 splx(s);
1081 } else if (new_flags & IFF_UP &&
1082 (ifp->if_flags & IFF_UP) == 0) {
1083 int s = splimp();
1084 if_up(ifp);
1085 splx(s);
1086 }
1087 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) |
1088 (new_flags &~ IFF_CANTCHANGE);
984263bc
MD
1089 if (new_flags & IFF_PPROMISC) {
1090 /* Permanently promiscuous mode requested */
1091 ifp->if_flags |= IFF_PROMISC;
1092 } else if (ifp->if_pcount == 0) {
1093 ifp->if_flags &= ~IFF_PROMISC;
1094 }
1095 if (ifp->if_ioctl)
bd4539cc
JH
1096 (void) (*ifp->if_ioctl)(ifp, cmd, data,
1097 td->td_proc->p_ucred);
984263bc
MD
1098 getmicrotime(&ifp->if_lastchange);
1099 break;
1100
1101 case SIOCSIFCAP:
dadab5e9 1102 error = suser(td);
984263bc
MD
1103 if (error)
1104 return (error);
1105 if (ifr->ifr_reqcap & ~ifp->if_capabilities)
1106 return (EINVAL);
bd4539cc 1107 (void) (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred);
984263bc
MD
1108 break;
1109
1fdf0954
HP
1110 case SIOCSIFNAME:
1111 error = suser(td);
1112 if (error != 0)
1113 return (error);
1114 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL);
1115 if (error != 0)
1116 return (error);
1117 if (new_name[0] == '\0')
1118 return (EINVAL);
1119 if (ifunit(new_name) != NULL)
1120 return (EEXIST);
f2bd8b67
JS
1121
1122 EVENTHANDLER_INVOKE(ifnet_detach_event, ifp);
1fdf0954
HP
1123
1124 /* Announce the departure of the interface. */
1125 rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
1126
1127 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname));
1128 ifa = TAILQ_FIRST(&ifp->if_addrhead);
1129 /* XXX IFA_LOCK(ifa); */
1130 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
1131 namelen = strlen(new_name);
1132 onamelen = sdl->sdl_nlen;
1133 /*
1134 * Move the address if needed. This is safe because we
1135 * allocate space for a name of length IFNAMSIZ when we
1136 * create this in if_attach().
1137 */
1138 if (namelen != onamelen) {
1139 bcopy(sdl->sdl_data + onamelen,
1140 sdl->sdl_data + namelen, sdl->sdl_alen);
1141 }
1142 bcopy(new_name, sdl->sdl_data, namelen);
1143 sdl->sdl_nlen = namelen;
1144 sdl = (struct sockaddr_dl *)ifa->ifa_netmask;
1145 bzero(sdl->sdl_data, onamelen);
1146 while (namelen != 0)
1147 sdl->sdl_data[--namelen] = 0xff;
1148 /* XXX IFA_UNLOCK(ifa) */
f2bd8b67
JS
1149
1150 EVENTHANDLER_INVOKE(ifnet_attach_event, ifp);
1fdf0954
HP
1151
1152 /* Announce the return of the interface. */
1153 rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
1154 break;
1155
984263bc 1156 case SIOCSIFMETRIC:
dadab5e9 1157 error = suser(td);
984263bc
MD
1158 if (error)
1159 return (error);
1160 ifp->if_metric = ifr->ifr_metric;
1161 getmicrotime(&ifp->if_lastchange);
1162 break;
1163
1164 case SIOCSIFPHYS:
dadab5e9 1165 error = suser(td);
984263bc
MD
1166 if (error)
1167 return error;
1168 if (!ifp->if_ioctl)
1169 return EOPNOTSUPP;
bd4539cc 1170 error = (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred);
984263bc
MD
1171 if (error == 0)
1172 getmicrotime(&ifp->if_lastchange);
1173 return(error);
1174
1175 case SIOCSIFMTU:
1176 {
1177 u_long oldmtu = ifp->if_mtu;
1178
dadab5e9 1179 error = suser(td);
984263bc
MD
1180 if (error)
1181 return (error);
1182 if (ifp->if_ioctl == NULL)
1183 return (EOPNOTSUPP);
1184 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU)
1185 return (EINVAL);
bd4539cc 1186 error = (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred);
984263bc
MD
1187 if (error == 0) {
1188 getmicrotime(&ifp->if_lastchange);
1189 rt_ifmsg(ifp);
1190 }
1191 /*
1192 * If the link MTU changed, do network layer specific procedure.
1193 */
1194 if (ifp->if_mtu != oldmtu) {
1195#ifdef INET6
1196 nd6_setmtu(ifp);
1197#endif
1198 }
1199 return (error);
1200 }
1201
1202 case SIOCADDMULTI:
1203 case SIOCDELMULTI:
dadab5e9 1204 error = suser(td);
984263bc
MD
1205 if (error)
1206 return (error);
1207
1208 /* Don't allow group membership on non-multicast interfaces. */
1209 if ((ifp->if_flags & IFF_MULTICAST) == 0)
1210 return EOPNOTSUPP;
1211
1212 /* Don't let users screw up protocols' entries. */
1213 if (ifr->ifr_addr.sa_family != AF_LINK)
1214 return EINVAL;
1215
1216 if (cmd == SIOCADDMULTI) {
1217 struct ifmultiaddr *ifma;
1218 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma);
1219 } else {
1220 error = if_delmulti(ifp, &ifr->ifr_addr);
1221 }
1222 if (error == 0)
1223 getmicrotime(&ifp->if_lastchange);
1224 return error;
1225
1226 case SIOCSIFPHYADDR:
1227 case SIOCDIFPHYADDR:
1228#ifdef INET6
1229 case SIOCSIFPHYADDR_IN6:
1230#endif
1231 case SIOCSLIFPHYADDR:
1232 case SIOCSIFMEDIA:
1233 case SIOCSIFGENERIC:
dadab5e9 1234 error = suser(td);
984263bc
MD
1235 if (error)
1236 return (error);
1237 if (ifp->if_ioctl == 0)
1238 return (EOPNOTSUPP);
bd4539cc 1239 error = (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred);
984263bc
MD
1240 if (error == 0)
1241 getmicrotime(&ifp->if_lastchange);
1242 return error;
1243
1244 case SIOCGIFSTATUS:
1245 ifs = (struct ifstat *)data;
1246 ifs->ascii[0] = '\0';
1247
1248 case SIOCGIFPSRCADDR:
1249 case SIOCGIFPDSTADDR:
1250 case SIOCGLIFPHYADDR:
1251 case SIOCGIFMEDIA:
1252 case SIOCGIFGENERIC:
1253 if (ifp->if_ioctl == 0)
1254 return (EOPNOTSUPP);
bd4539cc 1255 return ((*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred));
984263bc
MD
1256
1257 case SIOCSIFLLADDR:
dadab5e9 1258 error = suser(td);
984263bc
MD
1259 if (error)
1260 return (error);
1261 return if_setlladdr(ifp,
1262 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len);
1263
1264 default:
1265 oif_flags = ifp->if_flags;
1266 if (so->so_proto == 0)
1267 return (EOPNOTSUPP);
1268#ifndef COMPAT_43
6b6e0885 1269 error = so_pru_control(so, cmd, data, ifp, td);
984263bc
MD
1270#else
1271 {
1272 int ocmd = cmd;
1273
1274 switch (cmd) {
1275
1276 case SIOCSIFDSTADDR:
1277 case SIOCSIFADDR:
1278 case SIOCSIFBRDADDR:
1279 case SIOCSIFNETMASK:
1280#if BYTE_ORDER != BIG_ENDIAN
1281 if (ifr->ifr_addr.sa_family == 0 &&
1282 ifr->ifr_addr.sa_len < 16) {
1283 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len;
1284 ifr->ifr_addr.sa_len = 16;
1285 }
1286#else
1287 if (ifr->ifr_addr.sa_len == 0)
1288 ifr->ifr_addr.sa_len = 16;
1289#endif
1290 break;
1291
1292 case OSIOCGIFADDR:
1293 cmd = SIOCGIFADDR;
1294 break;
1295
1296 case OSIOCGIFDSTADDR:
1297 cmd = SIOCGIFDSTADDR;
1298 break;
1299
1300 case OSIOCGIFBRDADDR:
1301 cmd = SIOCGIFBRDADDR;
1302 break;
1303
1304 case OSIOCGIFNETMASK:
1305 cmd = SIOCGIFNETMASK;
1306 }
6b6e0885 1307 error = so_pru_control(so, cmd, data, ifp, td);
984263bc
MD
1308 switch (ocmd) {
1309
1310 case OSIOCGIFADDR:
1311 case OSIOCGIFDSTADDR:
1312 case OSIOCGIFBRDADDR:
1313 case OSIOCGIFNETMASK:
1314 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family;
1315
1316 }
1317 }
1318#endif /* COMPAT_43 */
1319
1320 if ((oif_flags ^ ifp->if_flags) & IFF_UP) {
1321#ifdef INET6
1322 DELAY(100);/* XXX: temporary workaround for fxp issue*/
1323 if (ifp->if_flags & IFF_UP) {
1324 int s = splimp();
1325 in6_if_up(ifp);
1326 splx(s);
1327 }
1328#endif
1329 }
1330 return (error);
1331
1332 }
1333 return (0);
1334}
1335
1336/*
1337 * Set/clear promiscuous mode on interface ifp based on the truth value
1338 * of pswitch. The calls are reference counted so that only the first
1339 * "on" request actually has an effect, as does the final "off" request.
1340 * Results are undefined if the "off" and "on" requests are not matched.
1341 */
1342int
1343ifpromisc(ifp, pswitch)
1344 struct ifnet *ifp;
1345 int pswitch;
1346{
1347 struct ifreq ifr;
1348 int error;
1349 int oldflags;
1350
1351 oldflags = ifp->if_flags;
46f25451 1352 if (ifp->if_flags & IFF_PPROMISC) {
984263bc
MD
1353 /* Do nothing if device is in permanently promiscuous mode */
1354 ifp->if_pcount += pswitch ? 1 : -1;
1355 return (0);
1356 }
1357 if (pswitch) {
1358 /*
1359 * If the device is not configured up, we cannot put it in
1360 * promiscuous mode.
1361 */
1362 if ((ifp->if_flags & IFF_UP) == 0)
1363 return (ENETDOWN);
1364 if (ifp->if_pcount++ != 0)
1365 return (0);
1366 ifp->if_flags |= IFF_PROMISC;
3e4a09e7
MD
1367 log(LOG_INFO, "%s: promiscuous mode enabled\n",
1368 ifp->if_xname);
984263bc
MD
1369 } else {
1370 if (--ifp->if_pcount > 0)
1371 return (0);
1372 ifp->if_flags &= ~IFF_PROMISC;
3e4a09e7
MD
1373 log(LOG_INFO, "%s: promiscuous mode disabled\n",
1374 ifp->if_xname);
984263bc
MD
1375 }
1376 ifr.ifr_flags = ifp->if_flags;
46f25451 1377 ifr.ifr_flagshigh = ifp->if_flags >> 16;
bd4539cc
JH
1378 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr,
1379 (struct ucred *)NULL);
984263bc
MD
1380 if (error == 0)
1381 rt_ifmsg(ifp);
1382 else
1383 ifp->if_flags = oldflags;
1384 return error;
1385}
1386
1387/*
1388 * Return interface configuration
1389 * of system. List may be used
1390 * in later ioctl's (above) to get
1391 * other information.
1392 */
1393/*ARGSUSED*/
1394static int
61b8d551 1395ifconf(u_long cmd, caddr_t data, struct thread *td)
984263bc 1396{
41c20dac
MD
1397 struct ifconf *ifc = (struct ifconf *)data;
1398 struct ifnet *ifp;
1399 struct ifaddr *ifa;
984263bc
MD
1400 struct sockaddr *sa;
1401 struct ifreq ifr, *ifrp;
1402 int space = ifc->ifc_len, error = 0;
1403
1404 ifrp = ifc->ifc_req;
1405 TAILQ_FOREACH(ifp, &ifnet, if_link) {
3e4a09e7 1406 int addrs;
984263bc
MD
1407
1408 if (space <= sizeof (ifr))
1409 break;
3e4a09e7
MD
1410 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name))
1411 >= sizeof(ifr.ifr_name)) {
984263bc
MD
1412 error = ENAMETOOLONG;
1413 break;
984263bc
MD
1414 }
1415
1416 addrs = 0;
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MD
1417 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1418 if (space <= sizeof(ifr))
1419 break;
1420 sa = ifa->ifa_addr;
61b8d551
JH
1421 if (td->td_proc->p_ucred->cr_prison &&
1422 prison_if(td, sa))
984263bc
MD
1423 continue;
1424 addrs++;
1425#ifdef COMPAT_43
1426 if (cmd == OSIOCGIFCONF) {
1427 struct osockaddr *osa =
1428 (struct osockaddr *)&ifr.ifr_addr;
1429 ifr.ifr_addr = *sa;
1430 osa->sa_family = sa->sa_family;
1431 error = copyout((caddr_t)&ifr, (caddr_t)ifrp,
1432 sizeof (ifr));
1433 ifrp++;
1434 } else
1435#endif
1436 if (sa->sa_len <= sizeof(*sa)) {
1437 ifr.ifr_addr = *sa;
1438 error = copyout((caddr_t)&ifr, (caddr_t)ifrp,
1439 sizeof (ifr));
1440 ifrp++;
1441 } else {
1442 if (space < sizeof (ifr) + sa->sa_len -
1443 sizeof(*sa))
1444 break;
1445 space -= sa->sa_len - sizeof(*sa);
1446 error = copyout((caddr_t)&ifr, (caddr_t)ifrp,
1447 sizeof (ifr.ifr_name));
1448 if (error == 0)
1449 error = copyout((caddr_t)sa,
1450 (caddr_t)&ifrp->ifr_addr, sa->sa_len);
1451 ifrp = (struct ifreq *)
1452 (sa->sa_len + (caddr_t)&ifrp->ifr_addr);
1453 }
1454 if (error)
1455 break;
1456 space -= sizeof (ifr);
1457 }
1458 if (error)
1459 break;
1460 if (!addrs) {
1461 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
1462 error = copyout((caddr_t)&ifr, (caddr_t)ifrp,
1463 sizeof (ifr));
1464 if (error)
1465 break;
1466 space -= sizeof (ifr);
1467 ifrp++;
1468 }
1469 }
1470 ifc->ifc_len -= space;
1471 return (error);
1472}
1473
1474/*
1475 * Just like if_promisc(), but for all-multicast-reception mode.
1476 */
1477int
1478if_allmulti(ifp, onswitch)
1479 struct ifnet *ifp;
1480 int onswitch;
1481{
1482 int error = 0;
1483 int s = splimp();
1484 struct ifreq ifr;
1485
1486 if (onswitch) {
1487 if (ifp->if_amcount++ == 0) {
1488 ifp->if_flags |= IFF_ALLMULTI;
1489 ifr.ifr_flags = ifp->if_flags;
46f25451 1490 ifr.ifr_flagshigh = ifp->if_flags >> 16;
bd4539cc
JH
1491 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr,
1492 (struct ucred *)NULL);
984263bc
MD
1493 }
1494 } else {
1495 if (ifp->if_amcount > 1) {
1496 ifp->if_amcount--;
1497 } else {
1498 ifp->if_amcount = 0;
1499 ifp->if_flags &= ~IFF_ALLMULTI;
1500 ifr.ifr_flags = ifp->if_flags;
46f25451 1501 ifr.ifr_flagshigh = ifp->if_flags >> 16;
bd4539cc
JH
1502 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr,
1503 (struct ucred *)NULL);
984263bc
MD
1504 }
1505 }
1506 splx(s);
1507
1508 if (error == 0)
1509 rt_ifmsg(ifp);
1510 return error;
1511}
1512
1513/*
1514 * Add a multicast listenership to the interface in question.
1515 * The link layer provides a routine which converts
1516 */
1517int
1518if_addmulti(ifp, sa, retifma)
1519 struct ifnet *ifp; /* interface to manipulate */
1520 struct sockaddr *sa; /* address to add */
1521 struct ifmultiaddr **retifma;
1522{
1523 struct sockaddr *llsa, *dupsa;
1524 int error, s;
1525 struct ifmultiaddr *ifma;
1526
1527 /*
1528 * If the matching multicast address already exists
1529 * then don't add a new one, just add a reference
1530 */
1531 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
1532 if (equal(sa, ifma->ifma_addr)) {
1533 ifma->ifma_refcount++;
1534 if (retifma)
1535 *retifma = ifma;
1536 return 0;
1537 }
1538 }
1539
1540 /*
1541 * Give the link layer a chance to accept/reject it, and also
1542 * find out which AF_LINK address this maps to, if it isn't one
1543 * already.
1544 */
1545 if (ifp->if_resolvemulti) {
1546 error = ifp->if_resolvemulti(ifp, &llsa, sa);
1547 if (error) return error;
1548 } else {
1549 llsa = 0;
1550 }
1551
1552 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, M_IFMADDR, M_WAITOK);
1553 MALLOC(dupsa, struct sockaddr *, sa->sa_len, M_IFMADDR, M_WAITOK);
1554 bcopy(sa, dupsa, sa->sa_len);
1555
1556 ifma->ifma_addr = dupsa;
1557 ifma->ifma_lladdr = llsa;
1558 ifma->ifma_ifp = ifp;
1559 ifma->ifma_refcount = 1;
1560 ifma->ifma_protospec = 0;
1561 rt_newmaddrmsg(RTM_NEWMADDR, ifma);
1562
1563 /*
1564 * Some network interfaces can scan the address list at
1565 * interrupt time; lock them out.
1566 */
1567 s = splimp();
1568 LIST_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link);
1569 splx(s);
1570 *retifma = ifma;
1571
1572 if (llsa != 0) {
1573 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
1574 if (equal(ifma->ifma_addr, llsa))
1575 break;
1576 }
1577 if (ifma) {
1578 ifma->ifma_refcount++;
1579 } else {
1580 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma,
1581 M_IFMADDR, M_WAITOK);
1582 MALLOC(dupsa, struct sockaddr *, llsa->sa_len,
1583 M_IFMADDR, M_WAITOK);
1584 bcopy(llsa, dupsa, llsa->sa_len);
1585 ifma->ifma_addr = dupsa;
1586 ifma->ifma_ifp = ifp;
1587 ifma->ifma_refcount = 1;
1588 s = splimp();
1589 LIST_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link);
1590 splx(s);
1591 }
1592 }
1593 /*
1594 * We are certain we have added something, so call down to the
1595 * interface to let them know about it.
1596 */
1597 s = splimp();
bd4539cc 1598 ifp->if_ioctl(ifp, SIOCADDMULTI, 0, (struct ucred *)NULL);
984263bc
MD
1599 splx(s);
1600
1601 return 0;
1602}
1603
1604/*
1605 * Remove a reference to a multicast address on this interface. Yell
1606 * if the request does not match an existing membership.
1607 */
1608int
1609if_delmulti(ifp, sa)
1610 struct ifnet *ifp;
1611 struct sockaddr *sa;
1612{
1613 struct ifmultiaddr *ifma;
1614 int s;
1615
1616 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link)
1617 if (equal(sa, ifma->ifma_addr))
1618 break;
1619 if (ifma == 0)
1620 return ENOENT;
1621
1622 if (ifma->ifma_refcount > 1) {
1623 ifma->ifma_refcount--;
1624 return 0;
1625 }
1626
1627 rt_newmaddrmsg(RTM_DELMADDR, ifma);
1628 sa = ifma->ifma_lladdr;
1629 s = splimp();
1630 LIST_REMOVE(ifma, ifma_link);
1631 /*
1632 * Make sure the interface driver is notified
1633 * in the case of a link layer mcast group being left.
1634 */
1635 if (ifma->ifma_addr->sa_family == AF_LINK && sa == 0)
bd4539cc 1636 ifp->if_ioctl(ifp, SIOCDELMULTI, 0, (struct ucred *)NULL);
984263bc
MD
1637 splx(s);
1638 free(ifma->ifma_addr, M_IFMADDR);
1639 free(ifma, M_IFMADDR);
1640 if (sa == 0)
1641 return 0;
1642
1643 /*
1644 * Now look for the link-layer address which corresponds to
1645 * this network address. It had been squirreled away in
1646 * ifma->ifma_lladdr for this purpose (so we don't have
1647 * to call ifp->if_resolvemulti() again), and we saved that
1648 * value in sa above. If some nasty deleted the
1649 * link-layer address out from underneath us, we can deal because
1650 * the address we stored was is not the same as the one which was
1651 * in the record for the link-layer address. (So we don't complain
1652 * in that case.)
1653 */
1654 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link)
1655 if (equal(sa, ifma->ifma_addr))
1656 break;
1657 if (ifma == 0)
1658 return 0;
1659
1660 if (ifma->ifma_refcount > 1) {
1661 ifma->ifma_refcount--;
1662 return 0;
1663 }
1664
1665 s = splimp();
1666 LIST_REMOVE(ifma, ifma_link);
bd4539cc 1667 ifp->if_ioctl(ifp, SIOCDELMULTI, 0, (struct ucred *)NULL);
984263bc
MD
1668 splx(s);
1669 free(ifma->ifma_addr, M_IFMADDR);
1670 free(sa, M_IFMADDR);
1671 free(ifma, M_IFMADDR);
1672
1673 return 0;
1674}
1675
1676/*
1677 * Set the link layer address on an interface.
1678 *
1679 * At this time we only support certain types of interfaces,
1680 * and we don't allow the length of the address to change.
1681 */
1682int
1683if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len)
1684{
1685 struct sockaddr_dl *sdl;
1686 struct ifaddr *ifa;
1687 struct ifreq ifr;
1688
1689 ifa = ifnet_addrs[ifp->if_index - 1];
1690 if (ifa == NULL)
1691 return (EINVAL);
1692 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
1693 if (sdl == NULL)
1694 return (EINVAL);
1695 if (len != sdl->sdl_alen) /* don't allow length to change */
1696 return (EINVAL);
1697 switch (ifp->if_type) {
1698 case IFT_ETHER: /* these types use struct arpcom */
1699 case IFT_FDDI:
1700 case IFT_XETHER:
1701 case IFT_ISO88025:
1702 case IFT_L2VLAN:
1703 bcopy(lladdr, ((struct arpcom *)ifp->if_softc)->ac_enaddr, len);
1704 /* FALLTHROUGH */
1705 case IFT_ARCNET:
1706 bcopy(lladdr, LLADDR(sdl), len);
1707 break;
1708 default:
1709 return (ENODEV);
1710 }
1711 /*
1712 * If the interface is already up, we need
1713 * to re-init it in order to reprogram its
1714 * address filter.
1715 */
1716 if ((ifp->if_flags & IFF_UP) != 0) {
1717 ifp->if_flags &= ~IFF_UP;
1718 ifr.ifr_flags = ifp->if_flags;
46f25451 1719 ifr.ifr_flagshigh = ifp->if_flags >> 16;
bd4539cc
JH
1720 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr,
1721 (struct ucred *)NULL);
984263bc
MD
1722 ifp->if_flags |= IFF_UP;
1723 ifr.ifr_flags = ifp->if_flags;
46f25451 1724 ifr.ifr_flagshigh = ifp->if_flags >> 16;
bd4539cc
JH
1725 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr,
1726 (struct ucred *)NULL);
984263bc
MD
1727#ifdef INET
1728 /*
1729 * Also send gratuitous ARPs to notify other nodes about
1730 * the address change.
1731 */
1732 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1733 if (ifa->ifa_addr != NULL &&
1734 ifa->ifa_addr->sa_family == AF_INET)
1735 arp_ifinit(ifp, ifa);
1736 }
1737#endif
1738 }
1739 return (0);
1740}
1741
1742struct ifmultiaddr *
1743ifmaof_ifpforaddr(sa, ifp)
1744 struct sockaddr *sa;
1745 struct ifnet *ifp;
1746{
1747 struct ifmultiaddr *ifma;
1748
1749 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link)
1750 if (equal(ifma->ifma_addr, sa))
1751 break;
1752
1753 return ifma;
1754}
1755
1550dfd9
MD
1756/*
1757 * The name argument must be a pointer to storage which will last as
1758 * long as the interface does. For physical devices, the result of
1759 * device_get_name(dev) is a good choice and for pseudo-devices a
1760 * static string works well.
1761 */
1762void
1763if_initname(struct ifnet *ifp, const char *name, int unit)
1764{
3e4a09e7
MD
1765 ifp->if_dname = name;
1766 ifp->if_dunit = unit;
1550dfd9
MD
1767 if (unit != IF_DUNIT_NONE)
1768 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit);
1769 else
1770 strlcpy(ifp->if_xname, name, IFNAMSIZ);
1771}
1772
984263bc
MD
1773int
1774if_printf(struct ifnet *ifp, const char *fmt, ...)
1775{
e2565a42 1776 __va_list ap;
984263bc
MD
1777 int retval;
1778
3e4a09e7 1779 retval = printf("%s: ", ifp->if_xname);
e2565a42 1780 __va_start(ap, fmt);
984263bc 1781 retval += vprintf(fmt, ap);
e2565a42 1782 __va_end(ap);
984263bc
MD
1783 return (retval);
1784}
1785
1786SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers");
1787SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management");