Always honor fdp->fd_nrdir as root. Once the loop reached NCF_ROOT,
[dragonfly.git] / sys / net / if.c
CommitLineData
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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
f23061d4 34 * $FreeBSD: src/sys/net/if.c,v 1.185 2004/03/13 02:35:03 brooks Exp $
590b8cd4 35 * $DragonFly: src/sys/net/if.c,v 1.26 2005/01/26 23:09:57 hsu 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 *);
158abb01
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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
f23061d4 126ifinit(void *dummy)
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127{
128 struct ifnet *ifp;
129 int s;
130
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131 callout_init(&if_slowtimo_timer);
132
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133 s = splimp();
134 TAILQ_FOREACH(ifp, &ifnet, if_link) {
135 if (ifp->if_snd.ifq_maxlen == 0) {
3e4a09e7 136 if_printf(ifp, "XXX: driver didn't set ifq_maxlen\n");
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137 ifp->if_snd.ifq_maxlen = ifqmaxlen;
138 }
139 }
140 splx(s);
abbb44bb 141
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142 if_slowtimo(0);
143}
144
145int if_index = 0;
146struct ifaddr **ifnet_addrs;
147struct ifnet **ifindex2ifnet = NULL;
148
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149/*
150 * Attach an interface to the
151 * list of "active" interfaces.
152 */
153void
f23061d4 154if_attach(struct ifnet *ifp)
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155{
156 unsigned socksize, ifasize;
157 int namelen, masklen;
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158 struct sockaddr_dl *sdl;
159 struct ifaddr *ifa;
590b8cd4 160
984263bc 161 static int if_indexlim = 8;
590b8cd4 162 static boolean_t inited;
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163
164 if (!inited) {
165 TAILQ_INIT(&ifnet);
590b8cd4 166 inited = TRUE;
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167 }
168
169 TAILQ_INSERT_TAIL(&ifnet, ifp, if_link);
170 ifp->if_index = ++if_index;
171 /*
172 * XXX -
173 * The old code would work if the interface passed a pre-existing
174 * chain of ifaddrs to this code. We don't trust our callers to
175 * properly initialize the tailq, however, so we no longer allow
176 * this unlikely case.
177 */
178 TAILQ_INIT(&ifp->if_addrhead);
179 TAILQ_INIT(&ifp->if_prefixhead);
180 LIST_INIT(&ifp->if_multiaddrs);
181 getmicrotime(&ifp->if_lastchange);
f23061d4 182 if (ifnet_addrs == NULL || if_index >= if_indexlim) {
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183 unsigned int n;
184 caddr_t q;
185
186 if_indexlim <<= 1;
187 n = if_indexlim * sizeof(struct ifaddr *);
188 q = malloc(n, M_IFADDR, M_WAITOK | M_ZERO);
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JH
189 if (ifnet_addrs != NULL) {
190 bcopy(ifnet_addrs, q, n/2);
191 free(ifnet_addrs, M_IFADDR);
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192 }
193 ifnet_addrs = (struct ifaddr **)q;
194
195 /* grow ifindex2ifnet */
196 n = if_indexlim * sizeof(struct ifnet *);
590b8cd4 197 q = malloc(n, M_IFADDR, M_WAITOK | M_ZERO);
984263bc 198 if (ifindex2ifnet) {
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199 bcopy(ifindex2ifnet, q, n/2);
200 free(ifindex2ifnet, M_IFADDR);
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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);
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218 ifasize = sizeof(struct ifaddr) + 2 * socksize;
219 ifa = malloc(ifasize, M_IFADDR, M_WAITOK | M_ZERO);
220 sdl = (struct sockaddr_dl *)(ifa + 1);
221 sdl->sdl_len = socksize;
222 sdl->sdl_family = AF_LINK;
223 bcopy(ifp->if_xname, sdl->sdl_data, namelen);
224 sdl->sdl_nlen = namelen;
225 sdl->sdl_index = ifp->if_index;
226 sdl->sdl_type = ifp->if_type;
227 ifnet_addrs[if_index - 1] = ifa;
228 ifa->ifa_ifp = ifp;
229 ifa->ifa_rtrequest = link_rtrequest;
230 ifa->ifa_addr = (struct sockaddr *)sdl;
231 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl);
232 ifa->ifa_netmask = (struct sockaddr *)sdl;
233 sdl->sdl_len = masklen;
234 while (namelen != 0)
235 sdl->sdl_data[--namelen] = 0xff;
236 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link);
984263bc 237
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238 EVENTHANDLER_INVOKE(ifnet_attach_event, ifp);
239
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240 /* Announce the interface. */
241 rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
242}
243
244/*
245 * Detach an interface, removing it from the
246 * list of "active" interfaces.
247 */
248void
f23061d4 249if_detach(struct ifnet *ifp)
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250{
251 struct ifaddr *ifa;
252 struct radix_node_head *rnh;
253 int s;
254 int i;
255
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256 EVENTHANDLER_INVOKE(ifnet_detach_event, ifp);
257
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258 /*
259 * Remove routes and flush queues.
260 */
261 s = splnet();
262 if_down(ifp);
263
264 /*
265 * Remove address from ifnet_addrs[] and maybe decrement if_index.
266 * Clean up all addresses.
267 */
268 ifnet_addrs[ifp->if_index - 1] = 0;
269 while (if_index > 0 && ifnet_addrs[if_index - 1] == 0)
270 if_index--;
271
272 for (ifa = TAILQ_FIRST(&ifp->if_addrhead); ifa;
273 ifa = TAILQ_FIRST(&ifp->if_addrhead)) {
274#ifdef INET
275 /* XXX: Ugly!! ad hoc just for INET */
276 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET) {
277 struct ifaliasreq ifr;
278
f23061d4 279 bzero(&ifr, sizeof ifr);
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280 ifr.ifra_addr = *ifa->ifa_addr;
281 if (ifa->ifa_dstaddr)
282 ifr.ifra_broadaddr = *ifa->ifa_dstaddr;
283 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp,
590b8cd4 284 NULL) == 0)
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285 continue;
286 }
287#endif /* INET */
288#ifdef INET6
289 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET6) {
290 in6_purgeaddr(ifa);
291 /* ifp_addrhead is already updated */
292 continue;
293 }
294#endif /* INET6 */
295 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link);
296 IFAFREE(ifa);
297 }
298
299#ifdef INET6
300 /*
301 * Remove all IPv6 kernel structs related to ifp. This should be done
302 * before removing routing entries below, since IPv6 interface direct
303 * routes are expected to be removed by the IPv6-specific kernel API.
304 * Otherwise, the kernel will detect some inconsistency and bark it.
305 */
306 in6_ifdetach(ifp);
307#endif
308
309 /*
310 * Delete all remaining routes using this interface
311 * Unfortuneatly the only way to do this is to slog through
312 * the entire routing table looking for routes which point
313 * to this interface...oh well...
314 */
315 for (i = 1; i <= AF_MAX; i++) {
316 if ((rnh = rt_tables[i]) == NULL)
317 continue;
f23061d4 318 rnh->rnh_walktree(rnh, if_rtdel, ifp);
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319 }
320
321 /* Announce that the interface is gone. */
322 rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
323
75857e7c
DR
324 ifindex2ifnet[ifp->if_index] = NULL;
325
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326 TAILQ_REMOVE(&ifnet, ifp, if_link);
327 splx(s);
328}
329
330/*
331 * Delete Routes for a Network Interface
f23061d4 332 *
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333 * Called for each routing entry via the rnh->rnh_walktree() call above
334 * to delete all route entries referencing a detaching network interface.
335 *
336 * Arguments:
337 * rn pointer to node in the routing table
338 * arg argument passed to rnh->rnh_walktree() - detaching interface
339 *
340 * Returns:
341 * 0 successful
342 * errno failed - reason indicated
343 *
344 */
345static int
f23061d4 346if_rtdel(struct radix_node *rn, void *arg)
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MD
347{
348 struct rtentry *rt = (struct rtentry *)rn;
349 struct ifnet *ifp = arg;
350 int err;
351
352 if (rt->rt_ifp == ifp) {
353
354 /*
355 * Protect (sorta) against walktree recursion problems
356 * with cloned routes
357 */
f23061d4 358 if (!(rt->rt_flags & RTF_UP))
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359 return (0);
360
361 err = rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway,
362 rt_mask(rt), rt->rt_flags,
363 (struct rtentry **) NULL);
364 if (err) {
365 log(LOG_WARNING, "if_rtdel: error %d\n", err);
366 }
367 }
368
369 return (0);
370}
371
372/*
373 * Create a clone network interface.
374 */
375int
f23061d4 376if_clone_create(char *name, int len)
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377{
378 struct if_clone *ifc;
379 char *dp;
b7b982e2 380 int wildcard, bytoff, bitoff;
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MD
381 int unit;
382 int err;
383
384 ifc = if_clone_lookup(name, &unit);
385 if (ifc == NULL)
386 return (EINVAL);
387
388 if (ifunit(name) != NULL)
389 return (EEXIST);
390
b7b982e2 391 bytoff = bitoff = 0;
984263bc 392 wildcard = (unit < 0);
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MD
393 /*
394 * Find a free unit if none was given.
395 */
396 if (wildcard) {
f23061d4
JH
397 while (bytoff < ifc->ifc_bmlen &&
398 ifc->ifc_units[bytoff] == 0xff)
b7b982e2
MD
399 bytoff++;
400 if (bytoff >= ifc->ifc_bmlen)
401 return (ENOSPC);
402 while ((ifc->ifc_units[bytoff] & (1 << bitoff)) != 0)
403 bitoff++;
404 unit = (bytoff << 3) + bitoff;
405 }
984263bc 406
b7b982e2
MD
407 if (unit > ifc->ifc_maxunit)
408 return (ENXIO);
409
410 err = (*ifc->ifc_create)(ifc, unit);
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411 if (err != 0)
412 return (err);
413
b7b982e2
MD
414 if (!wildcard) {
415 bytoff = unit >> 3;
416 bitoff = unit - (bytoff << 3);
417 }
418
419 /*
420 * Allocate the unit in the bitmap.
421 */
422 KASSERT((ifc->ifc_units[bytoff] & (1 << bitoff)) == 0,
423 ("%s: bit is already set", __func__));
424 ifc->ifc_units[bytoff] |= (1 << bitoff);
425
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426 /* In the wildcard case, we need to update the name. */
427 if (wildcard) {
428 for (dp = name; *dp != '\0'; dp++);
429 if (snprintf(dp, len - (dp-name), "%d", unit) >
430 len - (dp-name) - 1) {
431 /*
432 * This can only be a programmer error and
433 * there's no straightforward way to recover if
434 * it happens.
435 */
436 panic("if_clone_create(): interface name too long");
437 }
b7b982e2 438
984263bc
MD
439 }
440
f2bd8b67
JS
441 EVENTHANDLER_INVOKE(if_clone_event, ifc);
442
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443 return (0);
444}
445
446/*
447 * Destroy a clone network interface.
448 */
449int
f23061d4 450if_clone_destroy(const char *name)
984263bc
MD
451{
452 struct if_clone *ifc;
453 struct ifnet *ifp;
b7b982e2
MD
454 int bytoff, bitoff;
455 int unit;
984263bc 456
b7b982e2 457 ifc = if_clone_lookup(name, &unit);
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MD
458 if (ifc == NULL)
459 return (EINVAL);
460
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MD
461 if (unit < ifc->ifc_minifs)
462 return (EINVAL);
463
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464 ifp = ifunit(name);
465 if (ifp == NULL)
466 return (ENXIO);
467
468 if (ifc->ifc_destroy == NULL)
469 return (EOPNOTSUPP);
470
471 (*ifc->ifc_destroy)(ifp);
b7b982e2
MD
472
473 /*
474 * Compute offset in the bitmap and deallocate the unit.
475 */
476 bytoff = unit >> 3;
477 bitoff = unit - (bytoff << 3);
478 KASSERT((ifc->ifc_units[bytoff] & (1 << bitoff)) != 0,
479 ("%s: bit is already cleared", __func__));
480 ifc->ifc_units[bytoff] &= ~(1 << bitoff);
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481 return (0);
482}
483
484/*
485 * Look up a network interface cloner.
486 */
487struct if_clone *
f23061d4 488if_clone_lookup(const char *name, int *unitp)
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489{
490 struct if_clone *ifc;
491 const char *cp;
492 int i;
493
494 for (ifc = LIST_FIRST(&if_cloners); ifc != NULL;) {
495 for (cp = name, i = 0; i < ifc->ifc_namelen; i++, cp++) {
496 if (ifc->ifc_name[i] != *cp)
497 goto next_ifc;
498 }
499 goto found_name;
500 next_ifc:
501 ifc = LIST_NEXT(ifc, ifc_list);
502 }
503
504 /* No match. */
505 return ((struct if_clone *)NULL);
506
507 found_name:
508 if (*cp == '\0') {
509 i = -1;
510 } else {
511 for (i = 0; *cp != '\0'; cp++) {
512 if (*cp < '0' || *cp > '9') {
513 /* Bogus unit number. */
514 return (NULL);
515 }
516 i = (i * 10) + (*cp - '0');
517 }
518 }
519
520 if (unitp != NULL)
521 *unitp = i;
522 return (ifc);
523}
524
525/*
526 * Register a network interface cloner.
527 */
528void
f23061d4 529if_clone_attach(struct if_clone *ifc)
984263bc 530{
b7b982e2
MD
531 int bytoff, bitoff;
532 int err;
533 int len, maxclone;
534 int unit;
535
536 KASSERT(ifc->ifc_minifs - 1 <= ifc->ifc_maxunit,
537 ("%s: %s requested more units then allowed (%d > %d)",
538 __func__, ifc->ifc_name, ifc->ifc_minifs,
539 ifc->ifc_maxunit + 1));
540 /*
541 * Compute bitmap size and allocate it.
542 */
543 maxclone = ifc->ifc_maxunit + 1;
544 len = maxclone >> 3;
545 if ((len << 3) < maxclone)
546 len++;
547 ifc->ifc_units = malloc(len, M_CLONE, M_WAITOK | M_ZERO);
548 ifc->ifc_bmlen = len;
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549
550 LIST_INSERT_HEAD(&if_cloners, ifc, ifc_list);
551 if_cloners_count++;
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MD
552
553 for (unit = 0; unit < ifc->ifc_minifs; unit++) {
554 err = (*ifc->ifc_create)(ifc, unit);
555 KASSERT(err == 0,
556 ("%s: failed to create required interface %s%d",
557 __func__, ifc->ifc_name, unit));
558
559 /* Allocate the unit in the bitmap. */
560 bytoff = unit >> 3;
561 bitoff = unit - (bytoff << 3);
562 ifc->ifc_units[bytoff] |= (1 << bitoff);
563 }
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564}
565
566/*
567 * Unregister a network interface cloner.
568 */
569void
f23061d4 570if_clone_detach(struct if_clone *ifc)
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571{
572
573 LIST_REMOVE(ifc, ifc_list);
b7b982e2 574 free(ifc->ifc_units, M_CLONE);
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575 if_cloners_count--;
576}
577
578/*
579 * Provide list of interface cloners to userspace.
580 */
581int
f23061d4 582if_clone_list(struct if_clonereq *ifcr)
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583{
584 char outbuf[IFNAMSIZ], *dst;
585 struct if_clone *ifc;
586 int count, error = 0;
587
588 ifcr->ifcr_total = if_cloners_count;
589 if ((dst = ifcr->ifcr_buffer) == NULL) {
590 /* Just asking how many there are. */
591 return (0);
592 }
593
594 if (ifcr->ifcr_count < 0)
595 return (EINVAL);
596
597 count = (if_cloners_count < ifcr->ifcr_count) ?
598 if_cloners_count : ifcr->ifcr_count;
599
600 for (ifc = LIST_FIRST(&if_cloners); ifc != NULL && count != 0;
601 ifc = LIST_NEXT(ifc, ifc_list), count--, dst += IFNAMSIZ) {
3e4a09e7 602 strlcpy(outbuf, ifc->ifc_name, IFNAMSIZ);
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603 error = copyout(outbuf, dst, IFNAMSIZ);
604 if (error)
605 break;
606 }
607
608 return (error);
609}
610
611/*
612 * Locate an interface based on a complete address.
613 */
984263bc 614struct ifaddr *
f23061d4 615ifa_ifwithaddr(struct sockaddr *addr)
984263bc 616{
82ed7fc2
RG
617 struct ifnet *ifp;
618 struct ifaddr *ifa;
984263bc 619
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620 TAILQ_FOREACH(ifp, &ifnet, if_link)
621 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
622 if (ifa->ifa_addr->sa_family != addr->sa_family)
623 continue;
0c3c561c 624 if (sa_equal(addr, ifa->ifa_addr))
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625 return (ifa);
626 if ((ifp->if_flags & IFF_BROADCAST) && ifa->ifa_broadaddr &&
0c3c561c 627 /* IPv6 doesn't have broadcast */
984263bc 628 ifa->ifa_broadaddr->sa_len != 0 &&
0c3c561c 629 sa_equal(ifa->ifa_broadaddr, addr))
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630 return (ifa);
631 }
0c3c561c 632 return ((struct ifaddr *)NULL);
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633}
634/*
635 * Locate the point to point interface with a given destination address.
636 */
984263bc 637struct ifaddr *
f23061d4 638ifa_ifwithdstaddr(struct sockaddr *addr)
984263bc 639{
82ed7fc2
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640 struct ifnet *ifp;
641 struct ifaddr *ifa;
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MD
642
643 TAILQ_FOREACH(ifp, &ifnet, if_link)
644 if (ifp->if_flags & IFF_POINTOPOINT)
645 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
646 if (ifa->ifa_addr->sa_family != addr->sa_family)
647 continue;
0c3c561c
JH
648 if (ifa->ifa_dstaddr &&
649 sa_equal(addr, ifa->ifa_dstaddr))
984263bc
MD
650 return (ifa);
651 }
0c3c561c 652 return ((struct ifaddr *)NULL);
984263bc
MD
653}
654
655/*
656 * Find an interface on a specific network. If many, choice
657 * is most specific found.
658 */
659struct ifaddr *
f23061d4 660ifa_ifwithnet(struct sockaddr *addr)
984263bc 661{
82ed7fc2
RG
662 struct ifnet *ifp;
663 struct ifaddr *ifa;
984263bc
MD
664 struct ifaddr *ifa_maybe = (struct ifaddr *) 0;
665 u_int af = addr->sa_family;
666 char *addr_data = addr->sa_data, *cplim;
667
668 /*
669 * AF_LINK addresses can be looked up directly by their index number,
670 * so do that if we can.
671 */
672 if (af == AF_LINK) {
82ed7fc2 673 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr;
590b8cd4 674
984263bc
MD
675 if (sdl->sdl_index && sdl->sdl_index <= if_index)
676 return (ifnet_addrs[sdl->sdl_index - 1]);
677 }
678
679 /*
680 * Scan though each interface, looking for ones that have
681 * addresses in this address family.
682 */
683 TAILQ_FOREACH(ifp, &ifnet, if_link) {
684 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
82ed7fc2 685 char *cp, *cp2, *cp3;
984263bc
MD
686
687 if (ifa->ifa_addr->sa_family != af)
688next: continue;
689 if (af == AF_INET && ifp->if_flags & IFF_POINTOPOINT) {
690 /*
691 * This is a bit broken as it doesn't
692 * take into account that the remote end may
693 * be a single node in the network we are
694 * looking for.
695 * The trouble is that we don't know the
696 * netmask for the remote end.
697 */
0c3c561c
JH
698 if (ifa->ifa_dstaddr != NULL &&
699 sa_equal(addr, ifa->ifa_dstaddr))
f23061d4 700 return (ifa);
984263bc
MD
701 } else {
702 /*
703 * if we have a special address handler,
704 * then use it instead of the generic one.
705 */
f23061d4 706 if (ifa->ifa_claim_addr) {
984263bc
MD
707 if ((*ifa->ifa_claim_addr)(ifa, addr)) {
708 return (ifa);
709 } else {
710 continue;
711 }
712 }
713
714 /*
715 * Scan all the bits in the ifa's address.
716 * If a bit dissagrees with what we are
717 * looking for, mask it with the netmask
718 * to see if it really matters.
719 * (A byte at a time)
720 */
721 if (ifa->ifa_netmask == 0)
722 continue;
723 cp = addr_data;
724 cp2 = ifa->ifa_addr->sa_data;
725 cp3 = ifa->ifa_netmask->sa_data;
590b8cd4
JH
726 cplim = ifa->ifa_netmask->sa_len +
727 (char *)ifa->ifa_netmask;
984263bc
MD
728 while (cp3 < cplim)
729 if ((*cp++ ^ *cp2++) & *cp3++)
730 goto next; /* next address! */
731 /*
732 * If the netmask of what we just found
733 * is more specific than what we had before
734 * (if we had one) then remember the new one
735 * before continuing to search
736 * for an even better one.
737 */
738 if (ifa_maybe == 0 ||
f23061d4
JH
739 rn_refines((char *)ifa->ifa_netmask,
740 (char *)ifa_maybe->ifa_netmask))
984263bc
MD
741 ifa_maybe = ifa;
742 }
743 }
744 }
745 return (ifa_maybe);
746}
747
748/*
749 * Find an interface address specific to an interface best matching
750 * a given address.
751 */
752struct ifaddr *
f23061d4 753ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp)
984263bc 754{
82ed7fc2
RG
755 struct ifaddr *ifa;
756 char *cp, *cp2, *cp3;
757 char *cplim;
984263bc
MD
758 struct ifaddr *ifa_maybe = 0;
759 u_int af = addr->sa_family;
760
761 if (af >= AF_MAX)
762 return (0);
763 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
764 if (ifa->ifa_addr->sa_family != af)
765 continue;
766 if (ifa_maybe == 0)
767 ifa_maybe = ifa;
0c3c561c
JH
768 if (ifa->ifa_netmask == NULL) {
769 if (sa_equal(addr, ifa->ifa_addr) ||
770 (ifa->ifa_dstaddr != NULL &&
771 sa_equal(addr, ifa->ifa_dstaddr)))
984263bc
MD
772 return (ifa);
773 continue;
774 }
775 if (ifp->if_flags & IFF_POINTOPOINT) {
0c3c561c 776 if (sa_equal(addr, ifa->ifa_dstaddr))
984263bc
MD
777 return (ifa);
778 } else {
779 cp = addr->sa_data;
780 cp2 = ifa->ifa_addr->sa_data;
781 cp3 = ifa->ifa_netmask->sa_data;
782 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask;
783 for (; cp3 < cplim; cp3++)
784 if ((*cp++ ^ *cp2++) & *cp3)
785 break;
786 if (cp3 == cplim)
787 return (ifa);
788 }
789 }
790 return (ifa_maybe);
791}
792
793#include <net/route.h>
794
795/*
796 * Default action when installing a route with a Link Level gateway.
797 * Lookup an appropriate real ifa to point to.
798 * This should be moved to /sys/net/link.c eventually.
799 */
800static void
f23061d4 801link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info)
984263bc 802{
82ed7fc2 803 struct ifaddr *ifa;
984263bc
MD
804 struct sockaddr *dst;
805 struct ifnet *ifp;
806
f23061d4
JH
807 if (cmd != RTM_ADD || (ifa = rt->rt_ifa) == NULL ||
808 (ifp = ifa->ifa_ifp) == NULL || (dst = rt_key(rt)) == NULL)
984263bc
MD
809 return;
810 ifa = ifaof_ifpforaddr(dst, ifp);
f23061d4 811 if (ifa != NULL) {
984263bc 812 IFAFREE(rt->rt_ifa);
f23061d4 813 IFAREF(ifa);
984263bc 814 rt->rt_ifa = ifa;
984263bc
MD
815 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest)
816 ifa->ifa_rtrequest(cmd, rt, info);
817 }
818}
819
820/*
821 * Mark an interface down and notify protocols of
822 * the transition.
823 * NOTE: must be called at splnet or eqivalent.
824 */
825void
f23061d4 826if_unroute(struct ifnet *ifp, int flag, int fam)
984263bc 827{
82ed7fc2 828 struct ifaddr *ifa;
984263bc
MD
829
830 ifp->if_flags &= ~flag;
831 getmicrotime(&ifp->if_lastchange);
832 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
833 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family))
834 pfctlinput(PRC_IFDOWN, ifa->ifa_addr);
835 if_qflush(&ifp->if_snd);
836 rt_ifmsg(ifp);
837}
838
839/*
840 * Mark an interface up and notify protocols of
841 * the transition.
842 * NOTE: must be called at splnet or eqivalent.
843 */
844void
f23061d4 845if_route(struct ifnet *ifp, int flag, int fam)
984263bc 846{
82ed7fc2 847 struct ifaddr *ifa;
984263bc
MD
848
849 ifp->if_flags |= flag;
850 getmicrotime(&ifp->if_lastchange);
851 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
852 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family))
853 pfctlinput(PRC_IFUP, ifa->ifa_addr);
854 rt_ifmsg(ifp);
855#ifdef INET6
856 in6_if_up(ifp);
857#endif
858}
859
860/*
5c703385
MD
861 * Mark an interface down and notify protocols of the transition. An
862 * interface going down is also considered to be a synchronizing event.
863 * We must ensure that all packet processing related to the interface
864 * has completed before we return so e.g. the caller can free the ifnet
865 * structure that the mbufs may be referencing.
866 *
984263bc
MD
867 * NOTE: must be called at splnet or eqivalent.
868 */
869void
f23061d4 870if_down(struct ifnet *ifp)
984263bc
MD
871{
872
873 if_unroute(ifp, IFF_UP, AF_UNSPEC);
5c703385 874 netmsg_service_sync();
984263bc
MD
875}
876
877/*
878 * Mark an interface up and notify protocols of
879 * the transition.
880 * NOTE: must be called at splnet or eqivalent.
881 */
882void
f23061d4 883if_up(struct ifnet *ifp)
984263bc
MD
884{
885
886 if_route(ifp, IFF_UP, AF_UNSPEC);
887}
888
889/*
890 * Flush an interface queue.
891 */
892static void
f23061d4 893if_qflush(struct ifqueue *ifq)
984263bc 894{
82ed7fc2 895 struct mbuf *m, *n;
984263bc
MD
896
897 n = ifq->ifq_head;
898 while ((m = n) != 0) {
9a275e74 899 n = m->m_nextpkt;
984263bc
MD
900 m_freem(m);
901 }
902 ifq->ifq_head = 0;
903 ifq->ifq_tail = 0;
904 ifq->ifq_len = 0;
905}
906
907/*
908 * Handle interface watchdog timer routines. Called
909 * from softclock, we decrement timers (if set) and
910 * call the appropriate interface routine on expiration.
911 */
912static void
f23061d4 913if_slowtimo(void *arg)
984263bc 914{
82ed7fc2 915 struct ifnet *ifp;
984263bc
MD
916 int s = splimp();
917
918 TAILQ_FOREACH(ifp, &ifnet, if_link) {
919 if (ifp->if_timer == 0 || --ifp->if_timer)
920 continue;
921 if (ifp->if_watchdog)
922 (*ifp->if_watchdog)(ifp);
923 }
924 splx(s);
abbb44bb 925 callout_reset(&if_slowtimo_timer, hz / IFNET_SLOWHZ, if_slowtimo, NULL);
984263bc
MD
926}
927
928/*
929 * Map interface name to
930 * interface structure pointer.
931 */
932struct ifnet *
933ifunit(const char *name)
934{
984263bc 935 struct ifnet *ifp;
984263bc 936
984263bc 937 /*
3e4a09e7 938 * Search all the interfaces for this name/number
984263bc 939 */
3e4a09e7 940
984263bc 941 TAILQ_FOREACH(ifp, &ifnet, if_link) {
3e4a09e7 942 if (strncmp(ifp->if_xname, name, IFNAMSIZ) == 0)
984263bc
MD
943 break;
944 }
945 return (ifp);
946}
947
948
949/*
950 * Map interface name in a sockaddr_dl to
951 * interface structure pointer.
952 */
953struct ifnet *
f23061d4 954if_withname(struct sockaddr *sa)
984263bc
MD
955{
956 char ifname[IFNAMSIZ+1];
957 struct sockaddr_dl *sdl = (struct sockaddr_dl *)sa;
958
959 if ( (sa->sa_family != AF_LINK) || (sdl->sdl_nlen == 0) ||
960 (sdl->sdl_nlen > IFNAMSIZ) )
961 return NULL;
962
963 /*
964 * ifunit wants a null-terminated name. It may not be null-terminated
965 * in the sockaddr. We don't want to change the caller's sockaddr,
966 * and there might not be room to put the trailing null anyway, so we
967 * make a local copy that we know we can null terminate safely.
968 */
969
970 bcopy(sdl->sdl_data, ifname, sdl->sdl_nlen);
971 ifname[sdl->sdl_nlen] = '\0';
972 return ifunit(ifname);
973}
974
975
976/*
977 * Interface ioctls.
978 */
979int
dadab5e9 980ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td)
984263bc 981{
41c20dac
MD
982 struct ifnet *ifp;
983 struct ifreq *ifr;
984263bc
MD
984 struct ifstat *ifs;
985 int error;
986 short oif_flags;
987 int new_flags;
1fdf0954
HP
988 size_t namelen, onamelen;
989 char new_name[IFNAMSIZ];
990 struct ifaddr *ifa;
991 struct sockaddr_dl *sdl;
984263bc
MD
992
993 switch (cmd) {
994
995 case SIOCGIFCONF:
996 case OSIOCGIFCONF:
61b8d551 997 return (ifconf(cmd, data, td));
984263bc
MD
998 }
999 ifr = (struct ifreq *)data;
1000
1001 switch (cmd) {
1002 case SIOCIFCREATE:
1003 case SIOCIFDESTROY:
dadab5e9 1004 if ((error = suser(td)) != 0)
984263bc
MD
1005 return (error);
1006 return ((cmd == SIOCIFCREATE) ?
1007 if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name)) :
1008 if_clone_destroy(ifr->ifr_name));
f23061d4 1009
984263bc
MD
1010 case SIOCIFGCLONERS:
1011 return (if_clone_list((struct if_clonereq *)data));
1012 }
1013
1014 ifp = ifunit(ifr->ifr_name);
1015 if (ifp == 0)
1016 return (ENXIO);
1017 switch (cmd) {
1018
1019 case SIOCGIFFLAGS:
1020 ifr->ifr_flags = ifp->if_flags;
46f25451 1021 ifr->ifr_flagshigh = ifp->if_flags >> 16;
984263bc
MD
1022 break;
1023
1024 case SIOCGIFCAP:
1025 ifr->ifr_reqcap = ifp->if_capabilities;
1026 ifr->ifr_curcap = ifp->if_capenable;
1027 break;
1028
1029 case SIOCGIFMETRIC:
1030 ifr->ifr_metric = ifp->if_metric;
1031 break;
1032
1033 case SIOCGIFMTU:
1034 ifr->ifr_mtu = ifp->if_mtu;
1035 break;
1036
1037 case SIOCGIFPHYS:
1038 ifr->ifr_phys = ifp->if_physical;
1039 break;
1040
1041 case SIOCSIFFLAGS:
dadab5e9 1042 error = suser(td);
984263bc
MD
1043 if (error)
1044 return (error);
1045 new_flags = (ifr->ifr_flags & 0xffff) |
1046 (ifr->ifr_flagshigh << 16);
1047 if (ifp->if_flags & IFF_SMART) {
1048 /* Smart drivers twiddle their own routes */
1049 } else if (ifp->if_flags & IFF_UP &&
1050 (new_flags & IFF_UP) == 0) {
1051 int s = splimp();
1052 if_down(ifp);
1053 splx(s);
1054 } else if (new_flags & IFF_UP &&
1055 (ifp->if_flags & IFF_UP) == 0) {
1056 int s = splimp();
1057 if_up(ifp);
1058 splx(s);
1059 }
1060 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) |
1061 (new_flags &~ IFF_CANTCHANGE);
984263bc
MD
1062 if (new_flags & IFF_PPROMISC) {
1063 /* Permanently promiscuous mode requested */
1064 ifp->if_flags |= IFF_PROMISC;
1065 } else if (ifp->if_pcount == 0) {
1066 ifp->if_flags &= ~IFF_PROMISC;
1067 }
1068 if (ifp->if_ioctl)
f23061d4 1069 (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred);
984263bc
MD
1070 getmicrotime(&ifp->if_lastchange);
1071 break;
1072
1073 case SIOCSIFCAP:
dadab5e9 1074 error = suser(td);
984263bc
MD
1075 if (error)
1076 return (error);
1077 if (ifr->ifr_reqcap & ~ifp->if_capabilities)
1078 return (EINVAL);
f23061d4 1079 (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred);
984263bc
MD
1080 break;
1081
f23061d4
JH
1082 case SIOCSIFNAME:
1083 error = suser(td);
1084 if (error != 0)
1085 return (error);
1086 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL);
1087 if (error != 0)
1088 return (error);
1fdf0954
HP
1089 if (new_name[0] == '\0')
1090 return (EINVAL);
f23061d4
JH
1091 if (ifunit(new_name) != NULL)
1092 return (EEXIST);
f2bd8b67
JS
1093
1094 EVENTHANDLER_INVOKE(ifnet_detach_event, ifp);
f23061d4
JH
1095
1096 /* Announce the departure of the interface. */
1097 rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
1098
1099 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname));
1100 ifa = TAILQ_FIRST(&ifp->if_addrhead);
1101 /* XXX IFA_LOCK(ifa); */
1102 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
1103 namelen = strlen(new_name);
1104 onamelen = sdl->sdl_nlen;
1105 /*
1106 * Move the address if needed. This is safe because we
1107 * allocate space for a name of length IFNAMSIZ when we
1108 * create this in if_attach().
1109 */
1110 if (namelen != onamelen) {
1111 bcopy(sdl->sdl_data + onamelen,
1112 sdl->sdl_data + namelen, sdl->sdl_alen);
1113 }
1114 bcopy(new_name, sdl->sdl_data, namelen);
1115 sdl->sdl_nlen = namelen;
1116 sdl = (struct sockaddr_dl *)ifa->ifa_netmask;
1117 bzero(sdl->sdl_data, onamelen);
1118 while (namelen != 0)
1119 sdl->sdl_data[--namelen] = 0xff;
1120 /* XXX IFA_UNLOCK(ifa) */
f2bd8b67
JS
1121
1122 EVENTHANDLER_INVOKE(ifnet_attach_event, ifp);
f23061d4
JH
1123
1124 /* Announce the return of the interface. */
1125 rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
1126 break;
1fdf0954 1127
984263bc 1128 case SIOCSIFMETRIC:
dadab5e9 1129 error = suser(td);
984263bc
MD
1130 if (error)
1131 return (error);
1132 ifp->if_metric = ifr->ifr_metric;
1133 getmicrotime(&ifp->if_lastchange);
1134 break;
1135
1136 case SIOCSIFPHYS:
dadab5e9 1137 error = suser(td);
984263bc
MD
1138 if (error)
1139 return error;
1140 if (!ifp->if_ioctl)
1141 return EOPNOTSUPP;
bd4539cc 1142 error = (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred);
984263bc
MD
1143 if (error == 0)
1144 getmicrotime(&ifp->if_lastchange);
f23061d4 1145 return (error);
984263bc
MD
1146
1147 case SIOCSIFMTU:
1148 {
1149 u_long oldmtu = ifp->if_mtu;
1150
dadab5e9 1151 error = suser(td);
984263bc
MD
1152 if (error)
1153 return (error);
1154 if (ifp->if_ioctl == NULL)
1155 return (EOPNOTSUPP);
1156 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU)
1157 return (EINVAL);
bd4539cc 1158 error = (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred);
984263bc
MD
1159 if (error == 0) {
1160 getmicrotime(&ifp->if_lastchange);
1161 rt_ifmsg(ifp);
1162 }
1163 /*
1164 * If the link MTU changed, do network layer specific procedure.
1165 */
1166 if (ifp->if_mtu != oldmtu) {
1167#ifdef INET6
1168 nd6_setmtu(ifp);
1169#endif
1170 }
1171 return (error);
1172 }
1173
1174 case SIOCADDMULTI:
1175 case SIOCDELMULTI:
dadab5e9 1176 error = suser(td);
984263bc
MD
1177 if (error)
1178 return (error);
1179
1180 /* Don't allow group membership on non-multicast interfaces. */
1181 if ((ifp->if_flags & IFF_MULTICAST) == 0)
1182 return EOPNOTSUPP;
1183
1184 /* Don't let users screw up protocols' entries. */
1185 if (ifr->ifr_addr.sa_family != AF_LINK)
1186 return EINVAL;
1187
1188 if (cmd == SIOCADDMULTI) {
1189 struct ifmultiaddr *ifma;
1190 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma);
1191 } else {
1192 error = if_delmulti(ifp, &ifr->ifr_addr);
1193 }
1194 if (error == 0)
1195 getmicrotime(&ifp->if_lastchange);
1196 return error;
1197
1198 case SIOCSIFPHYADDR:
1199 case SIOCDIFPHYADDR:
1200#ifdef INET6
1201 case SIOCSIFPHYADDR_IN6:
1202#endif
1203 case SIOCSLIFPHYADDR:
1204 case SIOCSIFMEDIA:
1205 case SIOCSIFGENERIC:
dadab5e9 1206 error = suser(td);
984263bc
MD
1207 if (error)
1208 return (error);
1209 if (ifp->if_ioctl == 0)
1210 return (EOPNOTSUPP);
bd4539cc 1211 error = (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred);
984263bc
MD
1212 if (error == 0)
1213 getmicrotime(&ifp->if_lastchange);
1214 return error;
1215
1216 case SIOCGIFSTATUS:
1217 ifs = (struct ifstat *)data;
1218 ifs->ascii[0] = '\0';
f23061d4 1219
984263bc
MD
1220 case SIOCGIFPSRCADDR:
1221 case SIOCGIFPDSTADDR:
1222 case SIOCGLIFPHYADDR:
1223 case SIOCGIFMEDIA:
1224 case SIOCGIFGENERIC:
1225 if (ifp->if_ioctl == 0)
1226 return (EOPNOTSUPP);
bd4539cc 1227 return ((*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred));
984263bc
MD
1228
1229 case SIOCSIFLLADDR:
dadab5e9 1230 error = suser(td);
984263bc
MD
1231 if (error)
1232 return (error);
1233 return if_setlladdr(ifp,
1234 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len);
1235
1236 default:
1237 oif_flags = ifp->if_flags;
1238 if (so->so_proto == 0)
1239 return (EOPNOTSUPP);
1240#ifndef COMPAT_43
6b6e0885 1241 error = so_pru_control(so, cmd, data, ifp, td);
984263bc
MD
1242#else
1243 {
1244 int ocmd = cmd;
1245
1246 switch (cmd) {
1247
1248 case SIOCSIFDSTADDR:
1249 case SIOCSIFADDR:
1250 case SIOCSIFBRDADDR:
1251 case SIOCSIFNETMASK:
1252#if BYTE_ORDER != BIG_ENDIAN
1253 if (ifr->ifr_addr.sa_family == 0 &&
1254 ifr->ifr_addr.sa_len < 16) {
1255 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len;
1256 ifr->ifr_addr.sa_len = 16;
1257 }
1258#else
1259 if (ifr->ifr_addr.sa_len == 0)
1260 ifr->ifr_addr.sa_len = 16;
1261#endif
1262 break;
1263
1264 case OSIOCGIFADDR:
1265 cmd = SIOCGIFADDR;
1266 break;
1267
1268 case OSIOCGIFDSTADDR:
1269 cmd = SIOCGIFDSTADDR;
1270 break;
1271
1272 case OSIOCGIFBRDADDR:
1273 cmd = SIOCGIFBRDADDR;
1274 break;
1275
1276 case OSIOCGIFNETMASK:
1277 cmd = SIOCGIFNETMASK;
1278 }
6b6e0885 1279 error = so_pru_control(so, cmd, data, ifp, td);
984263bc
MD
1280 switch (ocmd) {
1281
1282 case OSIOCGIFADDR:
1283 case OSIOCGIFDSTADDR:
1284 case OSIOCGIFBRDADDR:
1285 case OSIOCGIFNETMASK:
1286 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family;
1287
1288 }
1289 }
1290#endif /* COMPAT_43 */
1291
1292 if ((oif_flags ^ ifp->if_flags) & IFF_UP) {
1293#ifdef INET6
1294 DELAY(100);/* XXX: temporary workaround for fxp issue*/
1295 if (ifp->if_flags & IFF_UP) {
1296 int s = splimp();
1297 in6_if_up(ifp);
1298 splx(s);
1299 }
1300#endif
1301 }
1302 return (error);
1303
1304 }
1305 return (0);
1306}
1307
1308/*
1309 * Set/clear promiscuous mode on interface ifp based on the truth value
1310 * of pswitch. The calls are reference counted so that only the first
1311 * "on" request actually has an effect, as does the final "off" request.
1312 * Results are undefined if the "off" and "on" requests are not matched.
1313 */
1314int
f23061d4 1315ifpromisc(struct ifnet *ifp, int pswitch)
984263bc
MD
1316{
1317 struct ifreq ifr;
1318 int error;
1319 int oldflags;
1320
1321 oldflags = ifp->if_flags;
46f25451 1322 if (ifp->if_flags & IFF_PPROMISC) {
984263bc
MD
1323 /* Do nothing if device is in permanently promiscuous mode */
1324 ifp->if_pcount += pswitch ? 1 : -1;
1325 return (0);
1326 }
1327 if (pswitch) {
1328 /*
1329 * If the device is not configured up, we cannot put it in
1330 * promiscuous mode.
1331 */
1332 if ((ifp->if_flags & IFF_UP) == 0)
1333 return (ENETDOWN);
1334 if (ifp->if_pcount++ != 0)
1335 return (0);
1336 ifp->if_flags |= IFF_PROMISC;
3e4a09e7
MD
1337 log(LOG_INFO, "%s: promiscuous mode enabled\n",
1338 ifp->if_xname);
984263bc
MD
1339 } else {
1340 if (--ifp->if_pcount > 0)
1341 return (0);
1342 ifp->if_flags &= ~IFF_PROMISC;
3e4a09e7
MD
1343 log(LOG_INFO, "%s: promiscuous mode disabled\n",
1344 ifp->if_xname);
984263bc
MD
1345 }
1346 ifr.ifr_flags = ifp->if_flags;
46f25451 1347 ifr.ifr_flagshigh = ifp->if_flags >> 16;
bd4539cc
JH
1348 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr,
1349 (struct ucred *)NULL);
984263bc
MD
1350 if (error == 0)
1351 rt_ifmsg(ifp);
1352 else
1353 ifp->if_flags = oldflags;
1354 return error;
1355}
1356
1357/*
1358 * Return interface configuration
1359 * of system. List may be used
1360 * in later ioctl's (above) to get
1361 * other information.
1362 */
984263bc 1363static int
61b8d551 1364ifconf(u_long cmd, caddr_t data, struct thread *td)
984263bc 1365{
41c20dac
MD
1366 struct ifconf *ifc = (struct ifconf *)data;
1367 struct ifnet *ifp;
1368 struct ifaddr *ifa;
984263bc
MD
1369 struct sockaddr *sa;
1370 struct ifreq ifr, *ifrp;
1371 int space = ifc->ifc_len, error = 0;
1372
1373 ifrp = ifc->ifc_req;
1374 TAILQ_FOREACH(ifp, &ifnet, if_link) {
3e4a09e7 1375 int addrs;
984263bc 1376
f23061d4 1377 if (space <= sizeof ifr)
984263bc 1378 break;
3e4a09e7
MD
1379 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name))
1380 >= sizeof(ifr.ifr_name)) {
984263bc
MD
1381 error = ENAMETOOLONG;
1382 break;
984263bc
MD
1383 }
1384
1385 addrs = 0;
984263bc 1386 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
f23061d4 1387 if (space <= sizeof ifr)
984263bc
MD
1388 break;
1389 sa = ifa->ifa_addr;
61b8d551
JH
1390 if (td->td_proc->p_ucred->cr_prison &&
1391 prison_if(td, sa))
984263bc
MD
1392 continue;
1393 addrs++;
1394#ifdef COMPAT_43
1395 if (cmd == OSIOCGIFCONF) {
1396 struct osockaddr *osa =
1397 (struct osockaddr *)&ifr.ifr_addr;
1398 ifr.ifr_addr = *sa;
1399 osa->sa_family = sa->sa_family;
f23061d4 1400 error = copyout(&ifr, ifrp, sizeof ifr);
984263bc
MD
1401 ifrp++;
1402 } else
1403#endif
1404 if (sa->sa_len <= sizeof(*sa)) {
1405 ifr.ifr_addr = *sa;
f23061d4 1406 error = copyout(&ifr, ifrp, sizeof ifr);
984263bc
MD
1407 ifrp++;
1408 } else {
f23061d4 1409 if (space < (sizeof ifr) + sa->sa_len -
984263bc
MD
1410 sizeof(*sa))
1411 break;
1412 space -= sa->sa_len - sizeof(*sa);
f23061d4
JH
1413 error = copyout(&ifr, ifrp,
1414 sizeof ifr.ifr_name);
984263bc 1415 if (error == 0)
f23061d4
JH
1416 error = copyout(sa, &ifrp->ifr_addr,
1417 sa->sa_len);
984263bc
MD
1418 ifrp = (struct ifreq *)
1419 (sa->sa_len + (caddr_t)&ifrp->ifr_addr);
1420 }
1421 if (error)
1422 break;
f23061d4 1423 space -= sizeof ifr;
984263bc
MD
1424 }
1425 if (error)
1426 break;
1427 if (!addrs) {
f23061d4
JH
1428 bzero(&ifr.ifr_addr, sizeof ifr.ifr_addr);
1429 error = copyout(&ifr, ifrp, sizeof ifr);
984263bc
MD
1430 if (error)
1431 break;
f23061d4 1432 space -= sizeof ifr;
984263bc
MD
1433 ifrp++;
1434 }
1435 }
1436 ifc->ifc_len -= space;
1437 return (error);
1438}
1439
1440/*
1441 * Just like if_promisc(), but for all-multicast-reception mode.
1442 */
1443int
f23061d4 1444if_allmulti(struct ifnet *ifp, int onswitch)
984263bc
MD
1445{
1446 int error = 0;
1447 int s = splimp();
1448 struct ifreq ifr;
1449
1450 if (onswitch) {
1451 if (ifp->if_amcount++ == 0) {
1452 ifp->if_flags |= IFF_ALLMULTI;
1453 ifr.ifr_flags = ifp->if_flags;
46f25451 1454 ifr.ifr_flagshigh = ifp->if_flags >> 16;
bd4539cc
JH
1455 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr,
1456 (struct ucred *)NULL);
984263bc
MD
1457 }
1458 } else {
1459 if (ifp->if_amcount > 1) {
1460 ifp->if_amcount--;
1461 } else {
1462 ifp->if_amcount = 0;
1463 ifp->if_flags &= ~IFF_ALLMULTI;
1464 ifr.ifr_flags = ifp->if_flags;
46f25451 1465 ifr.ifr_flagshigh = ifp->if_flags >> 16;
bd4539cc
JH
1466 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr,
1467 (struct ucred *)NULL);
984263bc
MD
1468 }
1469 }
1470 splx(s);
1471
1472 if (error == 0)
1473 rt_ifmsg(ifp);
1474 return error;
1475}
1476
1477/*
1478 * Add a multicast listenership to the interface in question.
1479 * The link layer provides a routine which converts
1480 */
1481int
f23061d4
JH
1482if_addmulti(
1483 struct ifnet *ifp, /* interface to manipulate */
1484 struct sockaddr *sa, /* address to add */
1485 struct ifmultiaddr **retifma)
984263bc
MD
1486{
1487 struct sockaddr *llsa, *dupsa;
1488 int error, s;
1489 struct ifmultiaddr *ifma;
1490
1491 /*
1492 * If the matching multicast address already exists
1493 * then don't add a new one, just add a reference
1494 */
1495 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
0c3c561c 1496 if (sa_equal(sa, ifma->ifma_addr)) {
984263bc
MD
1497 ifma->ifma_refcount++;
1498 if (retifma)
1499 *retifma = ifma;
1500 return 0;
1501 }
1502 }
1503
1504 /*
1505 * Give the link layer a chance to accept/reject it, and also
1506 * find out which AF_LINK address this maps to, if it isn't one
1507 * already.
1508 */
1509 if (ifp->if_resolvemulti) {
1510 error = ifp->if_resolvemulti(ifp, &llsa, sa);
1511 if (error) return error;
1512 } else {
1513 llsa = 0;
1514 }
1515
1516 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, M_IFMADDR, M_WAITOK);
1517 MALLOC(dupsa, struct sockaddr *, sa->sa_len, M_IFMADDR, M_WAITOK);
1518 bcopy(sa, dupsa, sa->sa_len);
1519
1520 ifma->ifma_addr = dupsa;
1521 ifma->ifma_lladdr = llsa;
1522 ifma->ifma_ifp = ifp;
1523 ifma->ifma_refcount = 1;
1524 ifma->ifma_protospec = 0;
1525 rt_newmaddrmsg(RTM_NEWMADDR, ifma);
1526
1527 /*
1528 * Some network interfaces can scan the address list at
1529 * interrupt time; lock them out.
1530 */
1531 s = splimp();
1532 LIST_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link);
1533 splx(s);
1534 *retifma = ifma;
1535
1536 if (llsa != 0) {
1537 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
0c3c561c 1538 if (sa_equal(ifma->ifma_addr, llsa))
984263bc
MD
1539 break;
1540 }
1541 if (ifma) {
1542 ifma->ifma_refcount++;
1543 } else {
1544 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma,
1545 M_IFMADDR, M_WAITOK);
1546 MALLOC(dupsa, struct sockaddr *, llsa->sa_len,
1547 M_IFMADDR, M_WAITOK);
1548 bcopy(llsa, dupsa, llsa->sa_len);
1549 ifma->ifma_addr = dupsa;
1550 ifma->ifma_ifp = ifp;
1551 ifma->ifma_refcount = 1;
1552 s = splimp();
1553 LIST_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link);
1554 splx(s);
1555 }
1556 }
1557 /*
1558 * We are certain we have added something, so call down to the
1559 * interface to let them know about it.
1560 */
1561 s = splimp();
bd4539cc 1562 ifp->if_ioctl(ifp, SIOCADDMULTI, 0, (struct ucred *)NULL);
984263bc
MD
1563 splx(s);
1564
1565 return 0;
1566}
1567
1568/*
1569 * Remove a reference to a multicast address on this interface. Yell
1570 * if the request does not match an existing membership.
1571 */
1572int
f23061d4 1573if_delmulti(struct ifnet *ifp, struct sockaddr *sa)
984263bc
MD
1574{
1575 struct ifmultiaddr *ifma;
1576 int s;
1577
1578 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link)
0c3c561c 1579 if (sa_equal(sa, ifma->ifma_addr))
984263bc
MD
1580 break;
1581 if (ifma == 0)
1582 return ENOENT;
1583
1584 if (ifma->ifma_refcount > 1) {
1585 ifma->ifma_refcount--;
1586 return 0;
1587 }
1588
1589 rt_newmaddrmsg(RTM_DELMADDR, ifma);
1590 sa = ifma->ifma_lladdr;
1591 s = splimp();
1592 LIST_REMOVE(ifma, ifma_link);
1593 /*
1594 * Make sure the interface driver is notified
1595 * in the case of a link layer mcast group being left.
1596 */
1597 if (ifma->ifma_addr->sa_family == AF_LINK && sa == 0)
bd4539cc 1598 ifp->if_ioctl(ifp, SIOCDELMULTI, 0, (struct ucred *)NULL);
984263bc
MD
1599 splx(s);
1600 free(ifma->ifma_addr, M_IFMADDR);
1601 free(ifma, M_IFMADDR);
1602 if (sa == 0)
1603 return 0;
1604
1605 /*
1606 * Now look for the link-layer address which corresponds to
1607 * this network address. It had been squirreled away in
1608 * ifma->ifma_lladdr for this purpose (so we don't have
1609 * to call ifp->if_resolvemulti() again), and we saved that
1610 * value in sa above. If some nasty deleted the
1611 * link-layer address out from underneath us, we can deal because
1612 * the address we stored was is not the same as the one which was
1613 * in the record for the link-layer address. (So we don't complain
1614 * in that case.)
1615 */
1616 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link)
0c3c561c 1617 if (sa_equal(sa, ifma->ifma_addr))
984263bc
MD
1618 break;
1619 if (ifma == 0)
1620 return 0;
1621
1622 if (ifma->ifma_refcount > 1) {
1623 ifma->ifma_refcount--;
1624 return 0;
1625 }
1626
1627 s = splimp();
1628 LIST_REMOVE(ifma, ifma_link);
bd4539cc 1629 ifp->if_ioctl(ifp, SIOCDELMULTI, 0, (struct ucred *)NULL);
984263bc
MD
1630 splx(s);
1631 free(ifma->ifma_addr, M_IFMADDR);
1632 free(sa, M_IFMADDR);
1633 free(ifma, M_IFMADDR);
1634
1635 return 0;
1636}
1637
1638/*
1639 * Set the link layer address on an interface.
1640 *
1641 * At this time we only support certain types of interfaces,
1642 * and we don't allow the length of the address to change.
1643 */
1644int
1645if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len)
1646{
1647 struct sockaddr_dl *sdl;
1648 struct ifaddr *ifa;
1649 struct ifreq ifr;
1650
1651 ifa = ifnet_addrs[ifp->if_index - 1];
1652 if (ifa == NULL)
1653 return (EINVAL);
1654 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
1655 if (sdl == NULL)
1656 return (EINVAL);
1657 if (len != sdl->sdl_alen) /* don't allow length to change */
1658 return (EINVAL);
1659 switch (ifp->if_type) {
1660 case IFT_ETHER: /* these types use struct arpcom */
1661 case IFT_FDDI:
1662 case IFT_XETHER:
1663 case IFT_ISO88025:
1664 case IFT_L2VLAN:
1665 bcopy(lladdr, ((struct arpcom *)ifp->if_softc)->ac_enaddr, len);
1666 /* FALLTHROUGH */
1667 case IFT_ARCNET:
1668 bcopy(lladdr, LLADDR(sdl), len);
1669 break;
1670 default:
1671 return (ENODEV);
1672 }
1673 /*
1674 * If the interface is already up, we need
1675 * to re-init it in order to reprogram its
1676 * address filter.
1677 */
1678 if ((ifp->if_flags & IFF_UP) != 0) {
1679 ifp->if_flags &= ~IFF_UP;
1680 ifr.ifr_flags = ifp->if_flags;
46f25451 1681 ifr.ifr_flagshigh = ifp->if_flags >> 16;
bd4539cc
JH
1682 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr,
1683 (struct ucred *)NULL);
984263bc
MD
1684 ifp->if_flags |= IFF_UP;
1685 ifr.ifr_flags = ifp->if_flags;
46f25451 1686 ifr.ifr_flagshigh = ifp->if_flags >> 16;
bd4539cc
JH
1687 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr,
1688 (struct ucred *)NULL);
984263bc
MD
1689#ifdef INET
1690 /*
1691 * Also send gratuitous ARPs to notify other nodes about
1692 * the address change.
1693 */
1694 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1695 if (ifa->ifa_addr != NULL &&
1696 ifa->ifa_addr->sa_family == AF_INET)
1697 arp_ifinit(ifp, ifa);
1698 }
1699#endif
1700 }
1701 return (0);
1702}
1703
1704struct ifmultiaddr *
f23061d4 1705ifmaof_ifpforaddr(struct sockaddr *sa, struct ifnet *ifp)
984263bc
MD
1706{
1707 struct ifmultiaddr *ifma;
1708
1709 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link)
0c3c561c 1710 if (sa_equal(ifma->ifma_addr, sa))
984263bc
MD
1711 break;
1712
1713 return ifma;
1714}
1715
1550dfd9
MD
1716/*
1717 * The name argument must be a pointer to storage which will last as
1718 * long as the interface does. For physical devices, the result of
1719 * device_get_name(dev) is a good choice and for pseudo-devices a
1720 * static string works well.
1721 */
1722void
1723if_initname(struct ifnet *ifp, const char *name, int unit)
1724{
3e4a09e7
MD
1725 ifp->if_dname = name;
1726 ifp->if_dunit = unit;
1550dfd9
MD
1727 if (unit != IF_DUNIT_NONE)
1728 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit);
1729 else
1730 strlcpy(ifp->if_xname, name, IFNAMSIZ);
1731}
1732
984263bc
MD
1733int
1734if_printf(struct ifnet *ifp, const char *fmt, ...)
1735{
e2565a42 1736 __va_list ap;
984263bc
MD
1737 int retval;
1738
3e4a09e7 1739 retval = printf("%s: ", ifp->if_xname);
e2565a42 1740 __va_start(ap, fmt);
984263bc 1741 retval += vprintf(fmt, ap);
e2565a42 1742 __va_end(ap);
984263bc
MD
1743 return (retval);
1744}
1745
1746SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers");
1747SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management");