Add icmp6 alias.
[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
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34 * $FreeBSD: src/sys/net/if.c,v 1.185 2004/03/13 02:35:03 brooks Exp $
35 * $DragonFly: src/sys/net/if.c,v 1.23 2004/12/21 02:54:14 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 *);
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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;
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160 static int if_indexlim = 8;
161 static int inited;
162
163 if (!inited) {
164 TAILQ_INIT(&ifnet);
165 inited = 1;
166 }
167
168 TAILQ_INSERT_TAIL(&ifnet, ifp, if_link);
169 ifp->if_index = ++if_index;
170 /*
171 * XXX -
172 * The old code would work if the interface passed a pre-existing
173 * chain of ifaddrs to this code. We don't trust our callers to
174 * properly initialize the tailq, however, so we no longer allow
175 * this unlikely case.
176 */
177 TAILQ_INIT(&ifp->if_addrhead);
178 TAILQ_INIT(&ifp->if_prefixhead);
179 LIST_INIT(&ifp->if_multiaddrs);
180 getmicrotime(&ifp->if_lastchange);
f23061d4 181 if (ifnet_addrs == NULL || if_index >= if_indexlim) {
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182 unsigned n = (if_indexlim <<= 1) * sizeof(ifa);
183 caddr_t q = malloc(n, M_IFADDR, M_WAITOK);
184 bzero(q, n);
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185 if (ifnet_addrs != NULL) {
186 bcopy(ifnet_addrs, q, n/2);
187 free(ifnet_addrs, M_IFADDR);
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188 }
189 ifnet_addrs = (struct ifaddr **)q;
190
191 /* grow ifindex2ifnet */
192 n = if_indexlim * sizeof(struct ifnet *);
193 q = malloc(n, M_IFADDR, M_WAITOK);
194 bzero(q, n);
195 if (ifindex2ifnet) {
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196 bcopy(ifindex2ifnet, q, n/2);
197 free(ifindex2ifnet, M_IFADDR);
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198 }
199 ifindex2ifnet = (struct ifnet **)q;
200 }
201
202 ifindex2ifnet[if_index] = ifp;
203
204 /*
205 * create a Link Level name for this device
206 */
3e4a09e7 207 namelen = strlen(ifp->if_xname);
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208#define _offsetof(t, m) ((int)((caddr_t)&((t *)0)->m))
209 masklen = _offsetof(struct sockaddr_dl, sdl_data[0]) + namelen;
210 socksize = masklen + ifp->if_addrlen;
211#define ROUNDUP(a) (1 + (((a) - 1) | (sizeof(long) - 1)))
212 if (socksize < sizeof(*sdl))
213 socksize = sizeof(*sdl);
214 socksize = ROUNDUP(socksize);
215 ifasize = sizeof(*ifa) + 2 * socksize;
216 ifa = (struct ifaddr *)malloc(ifasize, M_IFADDR, M_WAITOK);
217 if (ifa) {
f23061d4 218 bzero(ifa, ifasize);
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219 sdl = (struct sockaddr_dl *)(ifa + 1);
220 sdl->sdl_len = socksize;
221 sdl->sdl_family = AF_LINK;
3e4a09e7 222 bcopy(ifp->if_xname, sdl->sdl_data, namelen);
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223 sdl->sdl_nlen = namelen;
224 sdl->sdl_index = ifp->if_index;
225 sdl->sdl_type = ifp->if_type;
226 ifnet_addrs[if_index - 1] = ifa;
227 ifa->ifa_ifp = ifp;
228 ifa->ifa_rtrequest = link_rtrequest;
229 ifa->ifa_addr = (struct sockaddr *)sdl;
230 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl);
231 ifa->ifa_netmask = (struct sockaddr *)sdl;
232 sdl->sdl_len = masklen;
233 while (namelen != 0)
234 sdl->sdl_data[--namelen] = 0xff;
235 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link);
236 }
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,
284 NULL) == 0)
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
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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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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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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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393 /*
394 * Find a free unit if none was given.
395 */
396 if (wildcard) {
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397 while (bytoff < ifc->ifc_bmlen &&
398 ifc->ifc_units[bytoff] == 0xff)
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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
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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
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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
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439 }
440
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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)
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451{
452 struct if_clone *ifc;
453 struct ifnet *ifp;
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454 int bytoff, bitoff;
455 int unit;
984263bc 456
b7b982e2 457 ifc = if_clone_lookup(name, &unit);
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458 if (ifc == NULL)
459 return (EINVAL);
460
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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);
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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{
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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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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{
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617 struct ifnet *ifp;
618 struct ifaddr *ifa;
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619
620#define equal(a1, a2) \
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621 (bcmp((a1), (a2), ((struct sockaddr *)(a1))->sa_len) == 0)
622
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623 TAILQ_FOREACH(ifp, &ifnet, if_link)
624 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
625 if (ifa->ifa_addr->sa_family != addr->sa_family)
626 continue;
627 if (equal(addr, ifa->ifa_addr))
628 return (ifa);
629 if ((ifp->if_flags & IFF_BROADCAST) && ifa->ifa_broadaddr &&
630 /* IP6 doesn't have broadcast */
631 ifa->ifa_broadaddr->sa_len != 0 &&
632 equal(ifa->ifa_broadaddr, addr))
633 return (ifa);
634 }
635 return ((struct ifaddr *)0);
636}
637/*
638 * Locate the point to point interface with a given destination address.
639 */
984263bc 640struct ifaddr *
f23061d4 641ifa_ifwithdstaddr(struct sockaddr *addr)
984263bc 642{
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643 struct ifnet *ifp;
644 struct ifaddr *ifa;
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645
646 TAILQ_FOREACH(ifp, &ifnet, if_link)
647 if (ifp->if_flags & IFF_POINTOPOINT)
648 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
649 if (ifa->ifa_addr->sa_family != addr->sa_family)
650 continue;
651 if (ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr))
652 return (ifa);
653 }
654 return ((struct ifaddr *)0);
655}
656
657/*
658 * Find an interface on a specific network. If many, choice
659 * is most specific found.
660 */
661struct ifaddr *
f23061d4 662ifa_ifwithnet(struct sockaddr *addr)
984263bc 663{
82ed7fc2
RG
664 struct ifnet *ifp;
665 struct ifaddr *ifa;
984263bc
MD
666 struct ifaddr *ifa_maybe = (struct ifaddr *) 0;
667 u_int af = addr->sa_family;
668 char *addr_data = addr->sa_data, *cplim;
669
670 /*
671 * AF_LINK addresses can be looked up directly by their index number,
672 * so do that if we can.
673 */
674 if (af == AF_LINK) {
82ed7fc2 675 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr;
984263bc
MD
676 if (sdl->sdl_index && sdl->sdl_index <= if_index)
677 return (ifnet_addrs[sdl->sdl_index - 1]);
678 }
679
680 /*
681 * Scan though each interface, looking for ones that have
682 * addresses in this address family.
683 */
684 TAILQ_FOREACH(ifp, &ifnet, if_link) {
685 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
82ed7fc2 686 char *cp, *cp2, *cp3;
984263bc
MD
687
688 if (ifa->ifa_addr->sa_family != af)
689next: continue;
690 if (af == AF_INET && ifp->if_flags & IFF_POINTOPOINT) {
691 /*
692 * This is a bit broken as it doesn't
693 * take into account that the remote end may
694 * be a single node in the network we are
695 * looking for.
696 * The trouble is that we don't know the
697 * netmask for the remote end.
698 */
f23061d4
JH
699 if (ifa->ifa_dstaddr != 0 &&
700 equal(addr, ifa->ifa_dstaddr))
701 return (ifa);
984263bc
MD
702 } else {
703 /*
704 * if we have a special address handler,
705 * then use it instead of the generic one.
706 */
f23061d4 707 if (ifa->ifa_claim_addr) {
984263bc
MD
708 if ((*ifa->ifa_claim_addr)(ifa, addr)) {
709 return (ifa);
710 } else {
711 continue;
712 }
713 }
714
715 /*
716 * Scan all the bits in the ifa's address.
717 * If a bit dissagrees with what we are
718 * looking for, mask it with the netmask
719 * to see if it really matters.
720 * (A byte at a time)
721 */
722 if (ifa->ifa_netmask == 0)
723 continue;
724 cp = addr_data;
725 cp2 = ifa->ifa_addr->sa_data;
726 cp3 = ifa->ifa_netmask->sa_data;
727 cplim = ifa->ifa_netmask->sa_len
728 + (char *)ifa->ifa_netmask;
729 while (cp3 < cplim)
730 if ((*cp++ ^ *cp2++) & *cp3++)
731 goto next; /* next address! */
732 /*
733 * If the netmask of what we just found
734 * is more specific than what we had before
735 * (if we had one) then remember the new one
736 * before continuing to search
737 * for an even better one.
738 */
739 if (ifa_maybe == 0 ||
f23061d4
JH
740 rn_refines((char *)ifa->ifa_netmask,
741 (char *)ifa_maybe->ifa_netmask))
984263bc
MD
742 ifa_maybe = ifa;
743 }
744 }
745 }
746 return (ifa_maybe);
747}
748
749/*
750 * Find an interface address specific to an interface best matching
751 * a given address.
752 */
753struct ifaddr *
f23061d4 754ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp)
984263bc 755{
82ed7fc2
RG
756 struct ifaddr *ifa;
757 char *cp, *cp2, *cp3;
758 char *cplim;
984263bc
MD
759 struct ifaddr *ifa_maybe = 0;
760 u_int af = addr->sa_family;
761
762 if (af >= AF_MAX)
763 return (0);
764 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
765 if (ifa->ifa_addr->sa_family != af)
766 continue;
767 if (ifa_maybe == 0)
768 ifa_maybe = ifa;
769 if (ifa->ifa_netmask == 0) {
770 if (equal(addr, ifa->ifa_addr) ||
771 (ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr)))
772 return (ifa);
773 continue;
774 }
775 if (ifp->if_flags & IFF_POINTOPOINT) {
776 if (equal(addr, ifa->ifa_dstaddr))
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/*
861 * Mark an interface down and notify protocols of
862 * the transition.
863 * NOTE: must be called at splnet or eqivalent.
864 */
865void
f23061d4 866if_down(struct ifnet *ifp)
984263bc
MD
867{
868
869 if_unroute(ifp, IFF_UP, AF_UNSPEC);
870}
871
872/*
873 * Mark an interface up and notify protocols of
874 * the transition.
875 * NOTE: must be called at splnet or eqivalent.
876 */
877void
f23061d4 878if_up(struct ifnet *ifp)
984263bc
MD
879{
880
881 if_route(ifp, IFF_UP, AF_UNSPEC);
882}
883
884/*
885 * Flush an interface queue.
886 */
887static void
f23061d4 888if_qflush(struct ifqueue *ifq)
984263bc 889{
82ed7fc2 890 struct mbuf *m, *n;
984263bc
MD
891
892 n = ifq->ifq_head;
893 while ((m = n) != 0) {
9a275e74 894 n = m->m_nextpkt;
984263bc
MD
895 m_freem(m);
896 }
897 ifq->ifq_head = 0;
898 ifq->ifq_tail = 0;
899 ifq->ifq_len = 0;
900}
901
902/*
903 * Handle interface watchdog timer routines. Called
904 * from softclock, we decrement timers (if set) and
905 * call the appropriate interface routine on expiration.
906 */
907static void
f23061d4 908if_slowtimo(void *arg)
984263bc 909{
82ed7fc2 910 struct ifnet *ifp;
984263bc
MD
911 int s = splimp();
912
913 TAILQ_FOREACH(ifp, &ifnet, if_link) {
914 if (ifp->if_timer == 0 || --ifp->if_timer)
915 continue;
916 if (ifp->if_watchdog)
917 (*ifp->if_watchdog)(ifp);
918 }
919 splx(s);
abbb44bb 920 callout_reset(&if_slowtimo_timer, hz / IFNET_SLOWHZ, if_slowtimo, NULL);
984263bc
MD
921}
922
923/*
924 * Map interface name to
925 * interface structure pointer.
926 */
927struct ifnet *
928ifunit(const char *name)
929{
984263bc 930 struct ifnet *ifp;
984263bc 931
984263bc 932 /*
3e4a09e7 933 * Search all the interfaces for this name/number
984263bc 934 */
3e4a09e7 935
984263bc 936 TAILQ_FOREACH(ifp, &ifnet, if_link) {
3e4a09e7 937 if (strncmp(ifp->if_xname, name, IFNAMSIZ) == 0)
984263bc
MD
938 break;
939 }
940 return (ifp);
941}
942
943
944/*
945 * Map interface name in a sockaddr_dl to
946 * interface structure pointer.
947 */
948struct ifnet *
f23061d4 949if_withname(struct sockaddr *sa)
984263bc
MD
950{
951 char ifname[IFNAMSIZ+1];
952 struct sockaddr_dl *sdl = (struct sockaddr_dl *)sa;
953
954 if ( (sa->sa_family != AF_LINK) || (sdl->sdl_nlen == 0) ||
955 (sdl->sdl_nlen > IFNAMSIZ) )
956 return NULL;
957
958 /*
959 * ifunit wants a null-terminated name. It may not be null-terminated
960 * in the sockaddr. We don't want to change the caller's sockaddr,
961 * and there might not be room to put the trailing null anyway, so we
962 * make a local copy that we know we can null terminate safely.
963 */
964
965 bcopy(sdl->sdl_data, ifname, sdl->sdl_nlen);
966 ifname[sdl->sdl_nlen] = '\0';
967 return ifunit(ifname);
968}
969
970
971/*
972 * Interface ioctls.
973 */
974int
dadab5e9 975ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td)
984263bc 976{
41c20dac
MD
977 struct ifnet *ifp;
978 struct ifreq *ifr;
984263bc
MD
979 struct ifstat *ifs;
980 int error;
981 short oif_flags;
982 int new_flags;
1fdf0954
HP
983 size_t namelen, onamelen;
984 char new_name[IFNAMSIZ];
985 struct ifaddr *ifa;
986 struct sockaddr_dl *sdl;
984263bc
MD
987
988 switch (cmd) {
989
990 case SIOCGIFCONF:
991 case OSIOCGIFCONF:
61b8d551 992 return (ifconf(cmd, data, td));
984263bc
MD
993 }
994 ifr = (struct ifreq *)data;
995
996 switch (cmd) {
997 case SIOCIFCREATE:
998 case SIOCIFDESTROY:
dadab5e9 999 if ((error = suser(td)) != 0)
984263bc
MD
1000 return (error);
1001 return ((cmd == SIOCIFCREATE) ?
1002 if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name)) :
1003 if_clone_destroy(ifr->ifr_name));
f23061d4 1004
984263bc
MD
1005 case SIOCIFGCLONERS:
1006 return (if_clone_list((struct if_clonereq *)data));
1007 }
1008
1009 ifp = ifunit(ifr->ifr_name);
1010 if (ifp == 0)
1011 return (ENXIO);
1012 switch (cmd) {
1013
1014 case SIOCGIFFLAGS:
1015 ifr->ifr_flags = ifp->if_flags;
46f25451 1016 ifr->ifr_flagshigh = ifp->if_flags >> 16;
984263bc
MD
1017 break;
1018
1019 case SIOCGIFCAP:
1020 ifr->ifr_reqcap = ifp->if_capabilities;
1021 ifr->ifr_curcap = ifp->if_capenable;
1022 break;
1023
1024 case SIOCGIFMETRIC:
1025 ifr->ifr_metric = ifp->if_metric;
1026 break;
1027
1028 case SIOCGIFMTU:
1029 ifr->ifr_mtu = ifp->if_mtu;
1030 break;
1031
1032 case SIOCGIFPHYS:
1033 ifr->ifr_phys = ifp->if_physical;
1034 break;
1035
1036 case SIOCSIFFLAGS:
dadab5e9 1037 error = suser(td);
984263bc
MD
1038 if (error)
1039 return (error);
1040 new_flags = (ifr->ifr_flags & 0xffff) |
1041 (ifr->ifr_flagshigh << 16);
1042 if (ifp->if_flags & IFF_SMART) {
1043 /* Smart drivers twiddle their own routes */
1044 } else if (ifp->if_flags & IFF_UP &&
1045 (new_flags & IFF_UP) == 0) {
1046 int s = splimp();
1047 if_down(ifp);
1048 splx(s);
1049 } else if (new_flags & IFF_UP &&
1050 (ifp->if_flags & IFF_UP) == 0) {
1051 int s = splimp();
1052 if_up(ifp);
1053 splx(s);
1054 }
1055 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) |
1056 (new_flags &~ IFF_CANTCHANGE);
984263bc
MD
1057 if (new_flags & IFF_PPROMISC) {
1058 /* Permanently promiscuous mode requested */
1059 ifp->if_flags |= IFF_PROMISC;
1060 } else if (ifp->if_pcount == 0) {
1061 ifp->if_flags &= ~IFF_PROMISC;
1062 }
1063 if (ifp->if_ioctl)
f23061d4 1064 (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred);
984263bc
MD
1065 getmicrotime(&ifp->if_lastchange);
1066 break;
1067
1068 case SIOCSIFCAP:
dadab5e9 1069 error = suser(td);
984263bc
MD
1070 if (error)
1071 return (error);
1072 if (ifr->ifr_reqcap & ~ifp->if_capabilities)
1073 return (EINVAL);
f23061d4 1074 (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred);
984263bc
MD
1075 break;
1076
f23061d4
JH
1077 case SIOCSIFNAME:
1078 error = suser(td);
1079 if (error != 0)
1080 return (error);
1081 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL);
1082 if (error != 0)
1083 return (error);
1fdf0954
HP
1084 if (new_name[0] == '\0')
1085 return (EINVAL);
f23061d4
JH
1086 if (ifunit(new_name) != NULL)
1087 return (EEXIST);
f2bd8b67
JS
1088
1089 EVENTHANDLER_INVOKE(ifnet_detach_event, ifp);
f23061d4
JH
1090
1091 /* Announce the departure of the interface. */
1092 rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
1093
1094 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname));
1095 ifa = TAILQ_FIRST(&ifp->if_addrhead);
1096 /* XXX IFA_LOCK(ifa); */
1097 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
1098 namelen = strlen(new_name);
1099 onamelen = sdl->sdl_nlen;
1100 /*
1101 * Move the address if needed. This is safe because we
1102 * allocate space for a name of length IFNAMSIZ when we
1103 * create this in if_attach().
1104 */
1105 if (namelen != onamelen) {
1106 bcopy(sdl->sdl_data + onamelen,
1107 sdl->sdl_data + namelen, sdl->sdl_alen);
1108 }
1109 bcopy(new_name, sdl->sdl_data, namelen);
1110 sdl->sdl_nlen = namelen;
1111 sdl = (struct sockaddr_dl *)ifa->ifa_netmask;
1112 bzero(sdl->sdl_data, onamelen);
1113 while (namelen != 0)
1114 sdl->sdl_data[--namelen] = 0xff;
1115 /* XXX IFA_UNLOCK(ifa) */
f2bd8b67
JS
1116
1117 EVENTHANDLER_INVOKE(ifnet_attach_event, ifp);
f23061d4
JH
1118
1119 /* Announce the return of the interface. */
1120 rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
1121 break;
1fdf0954 1122
984263bc 1123 case SIOCSIFMETRIC:
dadab5e9 1124 error = suser(td);
984263bc
MD
1125 if (error)
1126 return (error);
1127 ifp->if_metric = ifr->ifr_metric;
1128 getmicrotime(&ifp->if_lastchange);
1129 break;
1130
1131 case SIOCSIFPHYS:
dadab5e9 1132 error = suser(td);
984263bc
MD
1133 if (error)
1134 return error;
1135 if (!ifp->if_ioctl)
1136 return EOPNOTSUPP;
bd4539cc 1137 error = (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred);
984263bc
MD
1138 if (error == 0)
1139 getmicrotime(&ifp->if_lastchange);
f23061d4 1140 return (error);
984263bc
MD
1141
1142 case SIOCSIFMTU:
1143 {
1144 u_long oldmtu = ifp->if_mtu;
1145
dadab5e9 1146 error = suser(td);
984263bc
MD
1147 if (error)
1148 return (error);
1149 if (ifp->if_ioctl == NULL)
1150 return (EOPNOTSUPP);
1151 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU)
1152 return (EINVAL);
bd4539cc 1153 error = (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred);
984263bc
MD
1154 if (error == 0) {
1155 getmicrotime(&ifp->if_lastchange);
1156 rt_ifmsg(ifp);
1157 }
1158 /*
1159 * If the link MTU changed, do network layer specific procedure.
1160 */
1161 if (ifp->if_mtu != oldmtu) {
1162#ifdef INET6
1163 nd6_setmtu(ifp);
1164#endif
1165 }
1166 return (error);
1167 }
1168
1169 case SIOCADDMULTI:
1170 case SIOCDELMULTI:
dadab5e9 1171 error = suser(td);
984263bc
MD
1172 if (error)
1173 return (error);
1174
1175 /* Don't allow group membership on non-multicast interfaces. */
1176 if ((ifp->if_flags & IFF_MULTICAST) == 0)
1177 return EOPNOTSUPP;
1178
1179 /* Don't let users screw up protocols' entries. */
1180 if (ifr->ifr_addr.sa_family != AF_LINK)
1181 return EINVAL;
1182
1183 if (cmd == SIOCADDMULTI) {
1184 struct ifmultiaddr *ifma;
1185 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma);
1186 } else {
1187 error = if_delmulti(ifp, &ifr->ifr_addr);
1188 }
1189 if (error == 0)
1190 getmicrotime(&ifp->if_lastchange);
1191 return error;
1192
1193 case SIOCSIFPHYADDR:
1194 case SIOCDIFPHYADDR:
1195#ifdef INET6
1196 case SIOCSIFPHYADDR_IN6:
1197#endif
1198 case SIOCSLIFPHYADDR:
1199 case SIOCSIFMEDIA:
1200 case SIOCSIFGENERIC:
dadab5e9 1201 error = suser(td);
984263bc
MD
1202 if (error)
1203 return (error);
1204 if (ifp->if_ioctl == 0)
1205 return (EOPNOTSUPP);
bd4539cc 1206 error = (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred);
984263bc
MD
1207 if (error == 0)
1208 getmicrotime(&ifp->if_lastchange);
1209 return error;
1210
1211 case SIOCGIFSTATUS:
1212 ifs = (struct ifstat *)data;
1213 ifs->ascii[0] = '\0';
f23061d4 1214
984263bc
MD
1215 case SIOCGIFPSRCADDR:
1216 case SIOCGIFPDSTADDR:
1217 case SIOCGLIFPHYADDR:
1218 case SIOCGIFMEDIA:
1219 case SIOCGIFGENERIC:
1220 if (ifp->if_ioctl == 0)
1221 return (EOPNOTSUPP);
bd4539cc 1222 return ((*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred));
984263bc
MD
1223
1224 case SIOCSIFLLADDR:
dadab5e9 1225 error = suser(td);
984263bc
MD
1226 if (error)
1227 return (error);
1228 return if_setlladdr(ifp,
1229 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len);
1230
1231 default:
1232 oif_flags = ifp->if_flags;
1233 if (so->so_proto == 0)
1234 return (EOPNOTSUPP);
1235#ifndef COMPAT_43
6b6e0885 1236 error = so_pru_control(so, cmd, data, ifp, td);
984263bc
MD
1237#else
1238 {
1239 int ocmd = cmd;
1240
1241 switch (cmd) {
1242
1243 case SIOCSIFDSTADDR:
1244 case SIOCSIFADDR:
1245 case SIOCSIFBRDADDR:
1246 case SIOCSIFNETMASK:
1247#if BYTE_ORDER != BIG_ENDIAN
1248 if (ifr->ifr_addr.sa_family == 0 &&
1249 ifr->ifr_addr.sa_len < 16) {
1250 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len;
1251 ifr->ifr_addr.sa_len = 16;
1252 }
1253#else
1254 if (ifr->ifr_addr.sa_len == 0)
1255 ifr->ifr_addr.sa_len = 16;
1256#endif
1257 break;
1258
1259 case OSIOCGIFADDR:
1260 cmd = SIOCGIFADDR;
1261 break;
1262
1263 case OSIOCGIFDSTADDR:
1264 cmd = SIOCGIFDSTADDR;
1265 break;
1266
1267 case OSIOCGIFBRDADDR:
1268 cmd = SIOCGIFBRDADDR;
1269 break;
1270
1271 case OSIOCGIFNETMASK:
1272 cmd = SIOCGIFNETMASK;
1273 }
6b6e0885 1274 error = so_pru_control(so, cmd, data, ifp, td);
984263bc
MD
1275 switch (ocmd) {
1276
1277 case OSIOCGIFADDR:
1278 case OSIOCGIFDSTADDR:
1279 case OSIOCGIFBRDADDR:
1280 case OSIOCGIFNETMASK:
1281 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family;
1282
1283 }
1284 }
1285#endif /* COMPAT_43 */
1286
1287 if ((oif_flags ^ ifp->if_flags) & IFF_UP) {
1288#ifdef INET6
1289 DELAY(100);/* XXX: temporary workaround for fxp issue*/
1290 if (ifp->if_flags & IFF_UP) {
1291 int s = splimp();
1292 in6_if_up(ifp);
1293 splx(s);
1294 }
1295#endif
1296 }
1297 return (error);
1298
1299 }
1300 return (0);
1301}
1302
1303/*
1304 * Set/clear promiscuous mode on interface ifp based on the truth value
1305 * of pswitch. The calls are reference counted so that only the first
1306 * "on" request actually has an effect, as does the final "off" request.
1307 * Results are undefined if the "off" and "on" requests are not matched.
1308 */
1309int
f23061d4 1310ifpromisc(struct ifnet *ifp, int pswitch)
984263bc
MD
1311{
1312 struct ifreq ifr;
1313 int error;
1314 int oldflags;
1315
1316 oldflags = ifp->if_flags;
46f25451 1317 if (ifp->if_flags & IFF_PPROMISC) {
984263bc
MD
1318 /* Do nothing if device is in permanently promiscuous mode */
1319 ifp->if_pcount += pswitch ? 1 : -1;
1320 return (0);
1321 }
1322 if (pswitch) {
1323 /*
1324 * If the device is not configured up, we cannot put it in
1325 * promiscuous mode.
1326 */
1327 if ((ifp->if_flags & IFF_UP) == 0)
1328 return (ENETDOWN);
1329 if (ifp->if_pcount++ != 0)
1330 return (0);
1331 ifp->if_flags |= IFF_PROMISC;
3e4a09e7
MD
1332 log(LOG_INFO, "%s: promiscuous mode enabled\n",
1333 ifp->if_xname);
984263bc
MD
1334 } else {
1335 if (--ifp->if_pcount > 0)
1336 return (0);
1337 ifp->if_flags &= ~IFF_PROMISC;
3e4a09e7
MD
1338 log(LOG_INFO, "%s: promiscuous mode disabled\n",
1339 ifp->if_xname);
984263bc
MD
1340 }
1341 ifr.ifr_flags = ifp->if_flags;
46f25451 1342 ifr.ifr_flagshigh = ifp->if_flags >> 16;
bd4539cc
JH
1343 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr,
1344 (struct ucred *)NULL);
984263bc
MD
1345 if (error == 0)
1346 rt_ifmsg(ifp);
1347 else
1348 ifp->if_flags = oldflags;
1349 return error;
1350}
1351
1352/*
1353 * Return interface configuration
1354 * of system. List may be used
1355 * in later ioctl's (above) to get
1356 * other information.
1357 */
984263bc 1358static int
61b8d551 1359ifconf(u_long cmd, caddr_t data, struct thread *td)
984263bc 1360{
41c20dac
MD
1361 struct ifconf *ifc = (struct ifconf *)data;
1362 struct ifnet *ifp;
1363 struct ifaddr *ifa;
984263bc
MD
1364 struct sockaddr *sa;
1365 struct ifreq ifr, *ifrp;
1366 int space = ifc->ifc_len, error = 0;
1367
1368 ifrp = ifc->ifc_req;
1369 TAILQ_FOREACH(ifp, &ifnet, if_link) {
3e4a09e7 1370 int addrs;
984263bc 1371
f23061d4 1372 if (space <= sizeof ifr)
984263bc 1373 break;
3e4a09e7
MD
1374 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name))
1375 >= sizeof(ifr.ifr_name)) {
984263bc
MD
1376 error = ENAMETOOLONG;
1377 break;
984263bc
MD
1378 }
1379
1380 addrs = 0;
984263bc 1381 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
f23061d4 1382 if (space <= sizeof ifr)
984263bc
MD
1383 break;
1384 sa = ifa->ifa_addr;
61b8d551
JH
1385 if (td->td_proc->p_ucred->cr_prison &&
1386 prison_if(td, sa))
984263bc
MD
1387 continue;
1388 addrs++;
1389#ifdef COMPAT_43
1390 if (cmd == OSIOCGIFCONF) {
1391 struct osockaddr *osa =
1392 (struct osockaddr *)&ifr.ifr_addr;
1393 ifr.ifr_addr = *sa;
1394 osa->sa_family = sa->sa_family;
f23061d4 1395 error = copyout(&ifr, ifrp, sizeof ifr);
984263bc
MD
1396 ifrp++;
1397 } else
1398#endif
1399 if (sa->sa_len <= sizeof(*sa)) {
1400 ifr.ifr_addr = *sa;
f23061d4 1401 error = copyout(&ifr, ifrp, sizeof ifr);
984263bc
MD
1402 ifrp++;
1403 } else {
f23061d4 1404 if (space < (sizeof ifr) + sa->sa_len -
984263bc
MD
1405 sizeof(*sa))
1406 break;
1407 space -= sa->sa_len - sizeof(*sa);
f23061d4
JH
1408 error = copyout(&ifr, ifrp,
1409 sizeof ifr.ifr_name);
984263bc 1410 if (error == 0)
f23061d4
JH
1411 error = copyout(sa, &ifrp->ifr_addr,
1412 sa->sa_len);
984263bc
MD
1413 ifrp = (struct ifreq *)
1414 (sa->sa_len + (caddr_t)&ifrp->ifr_addr);
1415 }
1416 if (error)
1417 break;
f23061d4 1418 space -= sizeof ifr;
984263bc
MD
1419 }
1420 if (error)
1421 break;
1422 if (!addrs) {
f23061d4
JH
1423 bzero(&ifr.ifr_addr, sizeof ifr.ifr_addr);
1424 error = copyout(&ifr, ifrp, sizeof ifr);
984263bc
MD
1425 if (error)
1426 break;
f23061d4 1427 space -= sizeof ifr;
984263bc
MD
1428 ifrp++;
1429 }
1430 }
1431 ifc->ifc_len -= space;
1432 return (error);
1433}
1434
1435/*
1436 * Just like if_promisc(), but for all-multicast-reception mode.
1437 */
1438int
f23061d4 1439if_allmulti(struct ifnet *ifp, int onswitch)
984263bc
MD
1440{
1441 int error = 0;
1442 int s = splimp();
1443 struct ifreq ifr;
1444
1445 if (onswitch) {
1446 if (ifp->if_amcount++ == 0) {
1447 ifp->if_flags |= IFF_ALLMULTI;
1448 ifr.ifr_flags = ifp->if_flags;
46f25451 1449 ifr.ifr_flagshigh = ifp->if_flags >> 16;
bd4539cc
JH
1450 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr,
1451 (struct ucred *)NULL);
984263bc
MD
1452 }
1453 } else {
1454 if (ifp->if_amcount > 1) {
1455 ifp->if_amcount--;
1456 } else {
1457 ifp->if_amcount = 0;
1458 ifp->if_flags &= ~IFF_ALLMULTI;
1459 ifr.ifr_flags = ifp->if_flags;
46f25451 1460 ifr.ifr_flagshigh = ifp->if_flags >> 16;
bd4539cc
JH
1461 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr,
1462 (struct ucred *)NULL);
984263bc
MD
1463 }
1464 }
1465 splx(s);
1466
1467 if (error == 0)
1468 rt_ifmsg(ifp);
1469 return error;
1470}
1471
1472/*
1473 * Add a multicast listenership to the interface in question.
1474 * The link layer provides a routine which converts
1475 */
1476int
f23061d4
JH
1477if_addmulti(
1478 struct ifnet *ifp, /* interface to manipulate */
1479 struct sockaddr *sa, /* address to add */
1480 struct ifmultiaddr **retifma)
984263bc
MD
1481{
1482 struct sockaddr *llsa, *dupsa;
1483 int error, s;
1484 struct ifmultiaddr *ifma;
1485
1486 /*
1487 * If the matching multicast address already exists
1488 * then don't add a new one, just add a reference
1489 */
1490 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
1491 if (equal(sa, ifma->ifma_addr)) {
1492 ifma->ifma_refcount++;
1493 if (retifma)
1494 *retifma = ifma;
1495 return 0;
1496 }
1497 }
1498
1499 /*
1500 * Give the link layer a chance to accept/reject it, and also
1501 * find out which AF_LINK address this maps to, if it isn't one
1502 * already.
1503 */
1504 if (ifp->if_resolvemulti) {
1505 error = ifp->if_resolvemulti(ifp, &llsa, sa);
1506 if (error) return error;
1507 } else {
1508 llsa = 0;
1509 }
1510
1511 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, M_IFMADDR, M_WAITOK);
1512 MALLOC(dupsa, struct sockaddr *, sa->sa_len, M_IFMADDR, M_WAITOK);
1513 bcopy(sa, dupsa, sa->sa_len);
1514
1515 ifma->ifma_addr = dupsa;
1516 ifma->ifma_lladdr = llsa;
1517 ifma->ifma_ifp = ifp;
1518 ifma->ifma_refcount = 1;
1519 ifma->ifma_protospec = 0;
1520 rt_newmaddrmsg(RTM_NEWMADDR, ifma);
1521
1522 /*
1523 * Some network interfaces can scan the address list at
1524 * interrupt time; lock them out.
1525 */
1526 s = splimp();
1527 LIST_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link);
1528 splx(s);
1529 *retifma = ifma;
1530
1531 if (llsa != 0) {
1532 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
1533 if (equal(ifma->ifma_addr, llsa))
1534 break;
1535 }
1536 if (ifma) {
1537 ifma->ifma_refcount++;
1538 } else {
1539 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma,
1540 M_IFMADDR, M_WAITOK);
1541 MALLOC(dupsa, struct sockaddr *, llsa->sa_len,
1542 M_IFMADDR, M_WAITOK);
1543 bcopy(llsa, dupsa, llsa->sa_len);
1544 ifma->ifma_addr = dupsa;
1545 ifma->ifma_ifp = ifp;
1546 ifma->ifma_refcount = 1;
1547 s = splimp();
1548 LIST_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link);
1549 splx(s);
1550 }
1551 }
1552 /*
1553 * We are certain we have added something, so call down to the
1554 * interface to let them know about it.
1555 */
1556 s = splimp();
bd4539cc 1557 ifp->if_ioctl(ifp, SIOCADDMULTI, 0, (struct ucred *)NULL);
984263bc
MD
1558 splx(s);
1559
1560 return 0;
1561}
1562
1563/*
1564 * Remove a reference to a multicast address on this interface. Yell
1565 * if the request does not match an existing membership.
1566 */
1567int
f23061d4 1568if_delmulti(struct ifnet *ifp, struct sockaddr *sa)
984263bc
MD
1569{
1570 struct ifmultiaddr *ifma;
1571 int s;
1572
1573 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link)
1574 if (equal(sa, ifma->ifma_addr))
1575 break;
1576 if (ifma == 0)
1577 return ENOENT;
1578
1579 if (ifma->ifma_refcount > 1) {
1580 ifma->ifma_refcount--;
1581 return 0;
1582 }
1583
1584 rt_newmaddrmsg(RTM_DELMADDR, ifma);
1585 sa = ifma->ifma_lladdr;
1586 s = splimp();
1587 LIST_REMOVE(ifma, ifma_link);
1588 /*
1589 * Make sure the interface driver is notified
1590 * in the case of a link layer mcast group being left.
1591 */
1592 if (ifma->ifma_addr->sa_family == AF_LINK && sa == 0)
bd4539cc 1593 ifp->if_ioctl(ifp, SIOCDELMULTI, 0, (struct ucred *)NULL);
984263bc
MD
1594 splx(s);
1595 free(ifma->ifma_addr, M_IFMADDR);
1596 free(ifma, M_IFMADDR);
1597 if (sa == 0)
1598 return 0;
1599
1600 /*
1601 * Now look for the link-layer address which corresponds to
1602 * this network address. It had been squirreled away in
1603 * ifma->ifma_lladdr for this purpose (so we don't have
1604 * to call ifp->if_resolvemulti() again), and we saved that
1605 * value in sa above. If some nasty deleted the
1606 * link-layer address out from underneath us, we can deal because
1607 * the address we stored was is not the same as the one which was
1608 * in the record for the link-layer address. (So we don't complain
1609 * in that case.)
1610 */
1611 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link)
1612 if (equal(sa, ifma->ifma_addr))
1613 break;
1614 if (ifma == 0)
1615 return 0;
1616
1617 if (ifma->ifma_refcount > 1) {
1618 ifma->ifma_refcount--;
1619 return 0;
1620 }
1621
1622 s = splimp();
1623 LIST_REMOVE(ifma, ifma_link);
bd4539cc 1624 ifp->if_ioctl(ifp, SIOCDELMULTI, 0, (struct ucred *)NULL);
984263bc
MD
1625 splx(s);
1626 free(ifma->ifma_addr, M_IFMADDR);
1627 free(sa, M_IFMADDR);
1628 free(ifma, M_IFMADDR);
1629
1630 return 0;
1631}
1632
1633/*
1634 * Set the link layer address on an interface.
1635 *
1636 * At this time we only support certain types of interfaces,
1637 * and we don't allow the length of the address to change.
1638 */
1639int
1640if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len)
1641{
1642 struct sockaddr_dl *sdl;
1643 struct ifaddr *ifa;
1644 struct ifreq ifr;
1645
1646 ifa = ifnet_addrs[ifp->if_index - 1];
1647 if (ifa == NULL)
1648 return (EINVAL);
1649 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
1650 if (sdl == NULL)
1651 return (EINVAL);
1652 if (len != sdl->sdl_alen) /* don't allow length to change */
1653 return (EINVAL);
1654 switch (ifp->if_type) {
1655 case IFT_ETHER: /* these types use struct arpcom */
1656 case IFT_FDDI:
1657 case IFT_XETHER:
1658 case IFT_ISO88025:
1659 case IFT_L2VLAN:
1660 bcopy(lladdr, ((struct arpcom *)ifp->if_softc)->ac_enaddr, len);
1661 /* FALLTHROUGH */
1662 case IFT_ARCNET:
1663 bcopy(lladdr, LLADDR(sdl), len);
1664 break;
1665 default:
1666 return (ENODEV);
1667 }
1668 /*
1669 * If the interface is already up, we need
1670 * to re-init it in order to reprogram its
1671 * address filter.
1672 */
1673 if ((ifp->if_flags & IFF_UP) != 0) {
1674 ifp->if_flags &= ~IFF_UP;
1675 ifr.ifr_flags = ifp->if_flags;
46f25451 1676 ifr.ifr_flagshigh = ifp->if_flags >> 16;
bd4539cc
JH
1677 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr,
1678 (struct ucred *)NULL);
984263bc
MD
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#ifdef INET
1685 /*
1686 * Also send gratuitous ARPs to notify other nodes about
1687 * the address change.
1688 */
1689 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1690 if (ifa->ifa_addr != NULL &&
1691 ifa->ifa_addr->sa_family == AF_INET)
1692 arp_ifinit(ifp, ifa);
1693 }
1694#endif
1695 }
1696 return (0);
1697}
1698
1699struct ifmultiaddr *
f23061d4 1700ifmaof_ifpforaddr(struct sockaddr *sa, struct ifnet *ifp)
984263bc
MD
1701{
1702 struct ifmultiaddr *ifma;
1703
1704 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link)
1705 if (equal(ifma->ifma_addr, sa))
1706 break;
1707
1708 return ifma;
1709}
1710
1550dfd9
MD
1711/*
1712 * The name argument must be a pointer to storage which will last as
1713 * long as the interface does. For physical devices, the result of
1714 * device_get_name(dev) is a good choice and for pseudo-devices a
1715 * static string works well.
1716 */
1717void
1718if_initname(struct ifnet *ifp, const char *name, int unit)
1719{
3e4a09e7
MD
1720 ifp->if_dname = name;
1721 ifp->if_dunit = unit;
1550dfd9
MD
1722 if (unit != IF_DUNIT_NONE)
1723 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit);
1724 else
1725 strlcpy(ifp->if_xname, name, IFNAMSIZ);
1726}
1727
984263bc
MD
1728int
1729if_printf(struct ifnet *ifp, const char *fmt, ...)
1730{
e2565a42 1731 __va_list ap;
984263bc
MD
1732 int retval;
1733
3e4a09e7 1734 retval = printf("%s: ", ifp->if_xname);
e2565a42 1735 __va_start(ap, fmt);
984263bc 1736 retval += vprintf(fmt, ap);
e2565a42 1737 __va_end(ap);
984263bc
MD
1738 return (retval);
1739}
1740
1741SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers");
1742SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management");