- Bring in patch to make.1 related to previous patch.
[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 $
5c703385 35 * $DragonFly: src/sys/net/if.c,v 1.25 2005/01/19 17:30:52 dillon 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;
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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
f2bd8b67
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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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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
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439 }
440
f2bd8b67
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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;
b7b982e2
MD
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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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{
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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{
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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{
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640 struct ifnet *ifp;
641 struct ifaddr *ifa;
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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;
984263bc
MD
674 if (sdl->sdl_index && sdl->sdl_index <= if_index)
675 return (ifnet_addrs[sdl->sdl_index - 1]);
676 }
677
678 /*
679 * Scan though each interface, looking for ones that have
680 * addresses in this address family.
681 */
682 TAILQ_FOREACH(ifp, &ifnet, if_link) {
683 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
82ed7fc2 684 char *cp, *cp2, *cp3;
984263bc
MD
685
686 if (ifa->ifa_addr->sa_family != af)
687next: continue;
688 if (af == AF_INET && ifp->if_flags & IFF_POINTOPOINT) {
689 /*
690 * This is a bit broken as it doesn't
691 * take into account that the remote end may
692 * be a single node in the network we are
693 * looking for.
694 * The trouble is that we don't know the
695 * netmask for the remote end.
696 */
0c3c561c
JH
697 if (ifa->ifa_dstaddr != NULL &&
698 sa_equal(addr, ifa->ifa_dstaddr))
f23061d4 699 return (ifa);
984263bc
MD
700 } else {
701 /*
702 * if we have a special address handler,
703 * then use it instead of the generic one.
704 */
f23061d4 705 if (ifa->ifa_claim_addr) {
984263bc
MD
706 if ((*ifa->ifa_claim_addr)(ifa, addr)) {
707 return (ifa);
708 } else {
709 continue;
710 }
711 }
712
713 /*
714 * Scan all the bits in the ifa's address.
715 * If a bit dissagrees with what we are
716 * looking for, mask it with the netmask
717 * to see if it really matters.
718 * (A byte at a time)
719 */
720 if (ifa->ifa_netmask == 0)
721 continue;
722 cp = addr_data;
723 cp2 = ifa->ifa_addr->sa_data;
724 cp3 = ifa->ifa_netmask->sa_data;
725 cplim = ifa->ifa_netmask->sa_len
726 + (char *)ifa->ifa_netmask;
727 while (cp3 < cplim)
728 if ((*cp++ ^ *cp2++) & *cp3++)
729 goto next; /* next address! */
730 /*
731 * If the netmask of what we just found
732 * is more specific than what we had before
733 * (if we had one) then remember the new one
734 * before continuing to search
735 * for an even better one.
736 */
737 if (ifa_maybe == 0 ||
f23061d4
JH
738 rn_refines((char *)ifa->ifa_netmask,
739 (char *)ifa_maybe->ifa_netmask))
984263bc
MD
740 ifa_maybe = ifa;
741 }
742 }
743 }
744 return (ifa_maybe);
745}
746
747/*
748 * Find an interface address specific to an interface best matching
749 * a given address.
750 */
751struct ifaddr *
f23061d4 752ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp)
984263bc 753{
82ed7fc2
RG
754 struct ifaddr *ifa;
755 char *cp, *cp2, *cp3;
756 char *cplim;
984263bc
MD
757 struct ifaddr *ifa_maybe = 0;
758 u_int af = addr->sa_family;
759
760 if (af >= AF_MAX)
761 return (0);
762 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
763 if (ifa->ifa_addr->sa_family != af)
764 continue;
765 if (ifa_maybe == 0)
766 ifa_maybe = ifa;
0c3c561c
JH
767 if (ifa->ifa_netmask == NULL) {
768 if (sa_equal(addr, ifa->ifa_addr) ||
769 (ifa->ifa_dstaddr != NULL &&
770 sa_equal(addr, ifa->ifa_dstaddr)))
984263bc
MD
771 return (ifa);
772 continue;
773 }
774 if (ifp->if_flags & IFF_POINTOPOINT) {
0c3c561c 775 if (sa_equal(addr, ifa->ifa_dstaddr))
984263bc
MD
776 return (ifa);
777 } else {
778 cp = addr->sa_data;
779 cp2 = ifa->ifa_addr->sa_data;
780 cp3 = ifa->ifa_netmask->sa_data;
781 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask;
782 for (; cp3 < cplim; cp3++)
783 if ((*cp++ ^ *cp2++) & *cp3)
784 break;
785 if (cp3 == cplim)
786 return (ifa);
787 }
788 }
789 return (ifa_maybe);
790}
791
792#include <net/route.h>
793
794/*
795 * Default action when installing a route with a Link Level gateway.
796 * Lookup an appropriate real ifa to point to.
797 * This should be moved to /sys/net/link.c eventually.
798 */
799static void
f23061d4 800link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info)
984263bc 801{
82ed7fc2 802 struct ifaddr *ifa;
984263bc
MD
803 struct sockaddr *dst;
804 struct ifnet *ifp;
805
f23061d4
JH
806 if (cmd != RTM_ADD || (ifa = rt->rt_ifa) == NULL ||
807 (ifp = ifa->ifa_ifp) == NULL || (dst = rt_key(rt)) == NULL)
984263bc
MD
808 return;
809 ifa = ifaof_ifpforaddr(dst, ifp);
f23061d4 810 if (ifa != NULL) {
984263bc 811 IFAFREE(rt->rt_ifa);
f23061d4 812 IFAREF(ifa);
984263bc 813 rt->rt_ifa = ifa;
984263bc
MD
814 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest)
815 ifa->ifa_rtrequest(cmd, rt, info);
816 }
817}
818
819/*
820 * Mark an interface down and notify protocols of
821 * the transition.
822 * NOTE: must be called at splnet or eqivalent.
823 */
824void
f23061d4 825if_unroute(struct ifnet *ifp, int flag, int fam)
984263bc 826{
82ed7fc2 827 struct ifaddr *ifa;
984263bc
MD
828
829 ifp->if_flags &= ~flag;
830 getmicrotime(&ifp->if_lastchange);
831 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
832 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family))
833 pfctlinput(PRC_IFDOWN, ifa->ifa_addr);
834 if_qflush(&ifp->if_snd);
835 rt_ifmsg(ifp);
836}
837
838/*
839 * Mark an interface up and notify protocols of
840 * the transition.
841 * NOTE: must be called at splnet or eqivalent.
842 */
843void
f23061d4 844if_route(struct ifnet *ifp, int flag, int fam)
984263bc 845{
82ed7fc2 846 struct ifaddr *ifa;
984263bc
MD
847
848 ifp->if_flags |= flag;
849 getmicrotime(&ifp->if_lastchange);
850 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
851 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family))
852 pfctlinput(PRC_IFUP, ifa->ifa_addr);
853 rt_ifmsg(ifp);
854#ifdef INET6
855 in6_if_up(ifp);
856#endif
857}
858
859/*
5c703385
MD
860 * Mark an interface down and notify protocols of the transition. An
861 * interface going down is also considered to be a synchronizing event.
862 * We must ensure that all packet processing related to the interface
863 * has completed before we return so e.g. the caller can free the ifnet
864 * structure that the mbufs may be referencing.
865 *
984263bc
MD
866 * NOTE: must be called at splnet or eqivalent.
867 */
868void
f23061d4 869if_down(struct ifnet *ifp)
984263bc
MD
870{
871
872 if_unroute(ifp, IFF_UP, AF_UNSPEC);
5c703385 873 netmsg_service_sync();
984263bc
MD
874}
875
876/*
877 * Mark an interface up and notify protocols of
878 * the transition.
879 * NOTE: must be called at splnet or eqivalent.
880 */
881void
f23061d4 882if_up(struct ifnet *ifp)
984263bc
MD
883{
884
885 if_route(ifp, IFF_UP, AF_UNSPEC);
886}
887
888/*
889 * Flush an interface queue.
890 */
891static void
f23061d4 892if_qflush(struct ifqueue *ifq)
984263bc 893{
82ed7fc2 894 struct mbuf *m, *n;
984263bc
MD
895
896 n = ifq->ifq_head;
897 while ((m = n) != 0) {
9a275e74 898 n = m->m_nextpkt;
984263bc
MD
899 m_freem(m);
900 }
901 ifq->ifq_head = 0;
902 ifq->ifq_tail = 0;
903 ifq->ifq_len = 0;
904}
905
906/*
907 * Handle interface watchdog timer routines. Called
908 * from softclock, we decrement timers (if set) and
909 * call the appropriate interface routine on expiration.
910 */
911static void
f23061d4 912if_slowtimo(void *arg)
984263bc 913{
82ed7fc2 914 struct ifnet *ifp;
984263bc
MD
915 int s = splimp();
916
917 TAILQ_FOREACH(ifp, &ifnet, if_link) {
918 if (ifp->if_timer == 0 || --ifp->if_timer)
919 continue;
920 if (ifp->if_watchdog)
921 (*ifp->if_watchdog)(ifp);
922 }
923 splx(s);
abbb44bb 924 callout_reset(&if_slowtimo_timer, hz / IFNET_SLOWHZ, if_slowtimo, NULL);
984263bc
MD
925}
926
927/*
928 * Map interface name to
929 * interface structure pointer.
930 */
931struct ifnet *
932ifunit(const char *name)
933{
984263bc 934 struct ifnet *ifp;
984263bc 935
984263bc 936 /*
3e4a09e7 937 * Search all the interfaces for this name/number
984263bc 938 */
3e4a09e7 939
984263bc 940 TAILQ_FOREACH(ifp, &ifnet, if_link) {
3e4a09e7 941 if (strncmp(ifp->if_xname, name, IFNAMSIZ) == 0)
984263bc
MD
942 break;
943 }
944 return (ifp);
945}
946
947
948/*
949 * Map interface name in a sockaddr_dl to
950 * interface structure pointer.
951 */
952struct ifnet *
f23061d4 953if_withname(struct sockaddr *sa)
984263bc
MD
954{
955 char ifname[IFNAMSIZ+1];
956 struct sockaddr_dl *sdl = (struct sockaddr_dl *)sa;
957
958 if ( (sa->sa_family != AF_LINK) || (sdl->sdl_nlen == 0) ||
959 (sdl->sdl_nlen > IFNAMSIZ) )
960 return NULL;
961
962 /*
963 * ifunit wants a null-terminated name. It may not be null-terminated
964 * in the sockaddr. We don't want to change the caller's sockaddr,
965 * and there might not be room to put the trailing null anyway, so we
966 * make a local copy that we know we can null terminate safely.
967 */
968
969 bcopy(sdl->sdl_data, ifname, sdl->sdl_nlen);
970 ifname[sdl->sdl_nlen] = '\0';
971 return ifunit(ifname);
972}
973
974
975/*
976 * Interface ioctls.
977 */
978int
dadab5e9 979ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td)
984263bc 980{
41c20dac
MD
981 struct ifnet *ifp;
982 struct ifreq *ifr;
984263bc
MD
983 struct ifstat *ifs;
984 int error;
985 short oif_flags;
986 int new_flags;
1fdf0954
HP
987 size_t namelen, onamelen;
988 char new_name[IFNAMSIZ];
989 struct ifaddr *ifa;
990 struct sockaddr_dl *sdl;
984263bc
MD
991
992 switch (cmd) {
993
994 case SIOCGIFCONF:
995 case OSIOCGIFCONF:
61b8d551 996 return (ifconf(cmd, data, td));
984263bc
MD
997 }
998 ifr = (struct ifreq *)data;
999
1000 switch (cmd) {
1001 case SIOCIFCREATE:
1002 case SIOCIFDESTROY:
dadab5e9 1003 if ((error = suser(td)) != 0)
984263bc
MD
1004 return (error);
1005 return ((cmd == SIOCIFCREATE) ?
1006 if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name)) :
1007 if_clone_destroy(ifr->ifr_name));
f23061d4 1008
984263bc
MD
1009 case SIOCIFGCLONERS:
1010 return (if_clone_list((struct if_clonereq *)data));
1011 }
1012
1013 ifp = ifunit(ifr->ifr_name);
1014 if (ifp == 0)
1015 return (ENXIO);
1016 switch (cmd) {
1017
1018 case SIOCGIFFLAGS:
1019 ifr->ifr_flags = ifp->if_flags;
46f25451 1020 ifr->ifr_flagshigh = ifp->if_flags >> 16;
984263bc
MD
1021 break;
1022
1023 case SIOCGIFCAP:
1024 ifr->ifr_reqcap = ifp->if_capabilities;
1025 ifr->ifr_curcap = ifp->if_capenable;
1026 break;
1027
1028 case SIOCGIFMETRIC:
1029 ifr->ifr_metric = ifp->if_metric;
1030 break;
1031
1032 case SIOCGIFMTU:
1033 ifr->ifr_mtu = ifp->if_mtu;
1034 break;
1035
1036 case SIOCGIFPHYS:
1037 ifr->ifr_phys = ifp->if_physical;
1038 break;
1039
1040 case SIOCSIFFLAGS:
dadab5e9 1041 error = suser(td);
984263bc
MD
1042 if (error)
1043 return (error);
1044 new_flags = (ifr->ifr_flags & 0xffff) |
1045 (ifr->ifr_flagshigh << 16);
1046 if (ifp->if_flags & IFF_SMART) {
1047 /* Smart drivers twiddle their own routes */
1048 } else if (ifp->if_flags & IFF_UP &&
1049 (new_flags & IFF_UP) == 0) {
1050 int s = splimp();
1051 if_down(ifp);
1052 splx(s);
1053 } else if (new_flags & IFF_UP &&
1054 (ifp->if_flags & IFF_UP) == 0) {
1055 int s = splimp();
1056 if_up(ifp);
1057 splx(s);
1058 }
1059 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) |
1060 (new_flags &~ IFF_CANTCHANGE);
984263bc
MD
1061 if (new_flags & IFF_PPROMISC) {
1062 /* Permanently promiscuous mode requested */
1063 ifp->if_flags |= IFF_PROMISC;
1064 } else if (ifp->if_pcount == 0) {
1065 ifp->if_flags &= ~IFF_PROMISC;
1066 }
1067 if (ifp->if_ioctl)
f23061d4 1068 (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred);
984263bc
MD
1069 getmicrotime(&ifp->if_lastchange);
1070 break;
1071
1072 case SIOCSIFCAP:
dadab5e9 1073 error = suser(td);
984263bc
MD
1074 if (error)
1075 return (error);
1076 if (ifr->ifr_reqcap & ~ifp->if_capabilities)
1077 return (EINVAL);
f23061d4 1078 (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred);
984263bc
MD
1079 break;
1080
f23061d4
JH
1081 case SIOCSIFNAME:
1082 error = suser(td);
1083 if (error != 0)
1084 return (error);
1085 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL);
1086 if (error != 0)
1087 return (error);
1fdf0954
HP
1088 if (new_name[0] == '\0')
1089 return (EINVAL);
f23061d4
JH
1090 if (ifunit(new_name) != NULL)
1091 return (EEXIST);
f2bd8b67
JS
1092
1093 EVENTHANDLER_INVOKE(ifnet_detach_event, ifp);
f23061d4
JH
1094
1095 /* Announce the departure of the interface. */
1096 rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
1097
1098 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname));
1099 ifa = TAILQ_FIRST(&ifp->if_addrhead);
1100 /* XXX IFA_LOCK(ifa); */
1101 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
1102 namelen = strlen(new_name);
1103 onamelen = sdl->sdl_nlen;
1104 /*
1105 * Move the address if needed. This is safe because we
1106 * allocate space for a name of length IFNAMSIZ when we
1107 * create this in if_attach().
1108 */
1109 if (namelen != onamelen) {
1110 bcopy(sdl->sdl_data + onamelen,
1111 sdl->sdl_data + namelen, sdl->sdl_alen);
1112 }
1113 bcopy(new_name, sdl->sdl_data, namelen);
1114 sdl->sdl_nlen = namelen;
1115 sdl = (struct sockaddr_dl *)ifa->ifa_netmask;
1116 bzero(sdl->sdl_data, onamelen);
1117 while (namelen != 0)
1118 sdl->sdl_data[--namelen] = 0xff;
1119 /* XXX IFA_UNLOCK(ifa) */
f2bd8b67
JS
1120
1121 EVENTHANDLER_INVOKE(ifnet_attach_event, ifp);
f23061d4
JH
1122
1123 /* Announce the return of the interface. */
1124 rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
1125 break;
1fdf0954 1126
984263bc 1127 case SIOCSIFMETRIC:
dadab5e9 1128 error = suser(td);
984263bc
MD
1129 if (error)
1130 return (error);
1131 ifp->if_metric = ifr->ifr_metric;
1132 getmicrotime(&ifp->if_lastchange);
1133 break;
1134
1135 case SIOCSIFPHYS:
dadab5e9 1136 error = suser(td);
984263bc
MD
1137 if (error)
1138 return error;
1139 if (!ifp->if_ioctl)
1140 return EOPNOTSUPP;
bd4539cc 1141 error = (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred);
984263bc
MD
1142 if (error == 0)
1143 getmicrotime(&ifp->if_lastchange);
f23061d4 1144 return (error);
984263bc
MD
1145
1146 case SIOCSIFMTU:
1147 {
1148 u_long oldmtu = ifp->if_mtu;
1149
dadab5e9 1150 error = suser(td);
984263bc
MD
1151 if (error)
1152 return (error);
1153 if (ifp->if_ioctl == NULL)
1154 return (EOPNOTSUPP);
1155 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU)
1156 return (EINVAL);
bd4539cc 1157 error = (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred);
984263bc
MD
1158 if (error == 0) {
1159 getmicrotime(&ifp->if_lastchange);
1160 rt_ifmsg(ifp);
1161 }
1162 /*
1163 * If the link MTU changed, do network layer specific procedure.
1164 */
1165 if (ifp->if_mtu != oldmtu) {
1166#ifdef INET6
1167 nd6_setmtu(ifp);
1168#endif
1169 }
1170 return (error);
1171 }
1172
1173 case SIOCADDMULTI:
1174 case SIOCDELMULTI:
dadab5e9 1175 error = suser(td);
984263bc
MD
1176 if (error)
1177 return (error);
1178
1179 /* Don't allow group membership on non-multicast interfaces. */
1180 if ((ifp->if_flags & IFF_MULTICAST) == 0)
1181 return EOPNOTSUPP;
1182
1183 /* Don't let users screw up protocols' entries. */
1184 if (ifr->ifr_addr.sa_family != AF_LINK)
1185 return EINVAL;
1186
1187 if (cmd == SIOCADDMULTI) {
1188 struct ifmultiaddr *ifma;
1189 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma);
1190 } else {
1191 error = if_delmulti(ifp, &ifr->ifr_addr);
1192 }
1193 if (error == 0)
1194 getmicrotime(&ifp->if_lastchange);
1195 return error;
1196
1197 case SIOCSIFPHYADDR:
1198 case SIOCDIFPHYADDR:
1199#ifdef INET6
1200 case SIOCSIFPHYADDR_IN6:
1201#endif
1202 case SIOCSLIFPHYADDR:
1203 case SIOCSIFMEDIA:
1204 case SIOCSIFGENERIC:
dadab5e9 1205 error = suser(td);
984263bc
MD
1206 if (error)
1207 return (error);
1208 if (ifp->if_ioctl == 0)
1209 return (EOPNOTSUPP);
bd4539cc 1210 error = (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred);
984263bc
MD
1211 if (error == 0)
1212 getmicrotime(&ifp->if_lastchange);
1213 return error;
1214
1215 case SIOCGIFSTATUS:
1216 ifs = (struct ifstat *)data;
1217 ifs->ascii[0] = '\0';
f23061d4 1218
984263bc
MD
1219 case SIOCGIFPSRCADDR:
1220 case SIOCGIFPDSTADDR:
1221 case SIOCGLIFPHYADDR:
1222 case SIOCGIFMEDIA:
1223 case SIOCGIFGENERIC:
1224 if (ifp->if_ioctl == 0)
1225 return (EOPNOTSUPP);
bd4539cc 1226 return ((*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred));
984263bc
MD
1227
1228 case SIOCSIFLLADDR:
dadab5e9 1229 error = suser(td);
984263bc
MD
1230 if (error)
1231 return (error);
1232 return if_setlladdr(ifp,
1233 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len);
1234
1235 default:
1236 oif_flags = ifp->if_flags;
1237 if (so->so_proto == 0)
1238 return (EOPNOTSUPP);
1239#ifndef COMPAT_43
6b6e0885 1240 error = so_pru_control(so, cmd, data, ifp, td);
984263bc
MD
1241#else
1242 {
1243 int ocmd = cmd;
1244
1245 switch (cmd) {
1246
1247 case SIOCSIFDSTADDR:
1248 case SIOCSIFADDR:
1249 case SIOCSIFBRDADDR:
1250 case SIOCSIFNETMASK:
1251#if BYTE_ORDER != BIG_ENDIAN
1252 if (ifr->ifr_addr.sa_family == 0 &&
1253 ifr->ifr_addr.sa_len < 16) {
1254 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len;
1255 ifr->ifr_addr.sa_len = 16;
1256 }
1257#else
1258 if (ifr->ifr_addr.sa_len == 0)
1259 ifr->ifr_addr.sa_len = 16;
1260#endif
1261 break;
1262
1263 case OSIOCGIFADDR:
1264 cmd = SIOCGIFADDR;
1265 break;
1266
1267 case OSIOCGIFDSTADDR:
1268 cmd = SIOCGIFDSTADDR;
1269 break;
1270
1271 case OSIOCGIFBRDADDR:
1272 cmd = SIOCGIFBRDADDR;
1273 break;
1274
1275 case OSIOCGIFNETMASK:
1276 cmd = SIOCGIFNETMASK;
1277 }
6b6e0885 1278 error = so_pru_control(so, cmd, data, ifp, td);
984263bc
MD
1279 switch (ocmd) {
1280
1281 case OSIOCGIFADDR:
1282 case OSIOCGIFDSTADDR:
1283 case OSIOCGIFBRDADDR:
1284 case OSIOCGIFNETMASK:
1285 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family;
1286
1287 }
1288 }
1289#endif /* COMPAT_43 */
1290
1291 if ((oif_flags ^ ifp->if_flags) & IFF_UP) {
1292#ifdef INET6
1293 DELAY(100);/* XXX: temporary workaround for fxp issue*/
1294 if (ifp->if_flags & IFF_UP) {
1295 int s = splimp();
1296 in6_if_up(ifp);
1297 splx(s);
1298 }
1299#endif
1300 }
1301 return (error);
1302
1303 }
1304 return (0);
1305}
1306
1307/*
1308 * Set/clear promiscuous mode on interface ifp based on the truth value
1309 * of pswitch. The calls are reference counted so that only the first
1310 * "on" request actually has an effect, as does the final "off" request.
1311 * Results are undefined if the "off" and "on" requests are not matched.
1312 */
1313int
f23061d4 1314ifpromisc(struct ifnet *ifp, int pswitch)
984263bc
MD
1315{
1316 struct ifreq ifr;
1317 int error;
1318 int oldflags;
1319
1320 oldflags = ifp->if_flags;
46f25451 1321 if (ifp->if_flags & IFF_PPROMISC) {
984263bc
MD
1322 /* Do nothing if device is in permanently promiscuous mode */
1323 ifp->if_pcount += pswitch ? 1 : -1;
1324 return (0);
1325 }
1326 if (pswitch) {
1327 /*
1328 * If the device is not configured up, we cannot put it in
1329 * promiscuous mode.
1330 */
1331 if ((ifp->if_flags & IFF_UP) == 0)
1332 return (ENETDOWN);
1333 if (ifp->if_pcount++ != 0)
1334 return (0);
1335 ifp->if_flags |= IFF_PROMISC;
3e4a09e7
MD
1336 log(LOG_INFO, "%s: promiscuous mode enabled\n",
1337 ifp->if_xname);
984263bc
MD
1338 } else {
1339 if (--ifp->if_pcount > 0)
1340 return (0);
1341 ifp->if_flags &= ~IFF_PROMISC;
3e4a09e7
MD
1342 log(LOG_INFO, "%s: promiscuous mode disabled\n",
1343 ifp->if_xname);
984263bc
MD
1344 }
1345 ifr.ifr_flags = ifp->if_flags;
46f25451 1346 ifr.ifr_flagshigh = ifp->if_flags >> 16;
bd4539cc
JH
1347 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr,
1348 (struct ucred *)NULL);
984263bc
MD
1349 if (error == 0)
1350 rt_ifmsg(ifp);
1351 else
1352 ifp->if_flags = oldflags;
1353 return error;
1354}
1355
1356/*
1357 * Return interface configuration
1358 * of system. List may be used
1359 * in later ioctl's (above) to get
1360 * other information.
1361 */
984263bc 1362static int
61b8d551 1363ifconf(u_long cmd, caddr_t data, struct thread *td)
984263bc 1364{
41c20dac
MD
1365 struct ifconf *ifc = (struct ifconf *)data;
1366 struct ifnet *ifp;
1367 struct ifaddr *ifa;
984263bc
MD
1368 struct sockaddr *sa;
1369 struct ifreq ifr, *ifrp;
1370 int space = ifc->ifc_len, error = 0;
1371
1372 ifrp = ifc->ifc_req;
1373 TAILQ_FOREACH(ifp, &ifnet, if_link) {
3e4a09e7 1374 int addrs;
984263bc 1375
f23061d4 1376 if (space <= sizeof ifr)
984263bc 1377 break;
3e4a09e7
MD
1378 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name))
1379 >= sizeof(ifr.ifr_name)) {
984263bc
MD
1380 error = ENAMETOOLONG;
1381 break;
984263bc
MD
1382 }
1383
1384 addrs = 0;
984263bc 1385 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
f23061d4 1386 if (space <= sizeof ifr)
984263bc
MD
1387 break;
1388 sa = ifa->ifa_addr;
61b8d551
JH
1389 if (td->td_proc->p_ucred->cr_prison &&
1390 prison_if(td, sa))
984263bc
MD
1391 continue;
1392 addrs++;
1393#ifdef COMPAT_43
1394 if (cmd == OSIOCGIFCONF) {
1395 struct osockaddr *osa =
1396 (struct osockaddr *)&ifr.ifr_addr;
1397 ifr.ifr_addr = *sa;
1398 osa->sa_family = sa->sa_family;
f23061d4 1399 error = copyout(&ifr, ifrp, sizeof ifr);
984263bc
MD
1400 ifrp++;
1401 } else
1402#endif
1403 if (sa->sa_len <= sizeof(*sa)) {
1404 ifr.ifr_addr = *sa;
f23061d4 1405 error = copyout(&ifr, ifrp, sizeof ifr);
984263bc
MD
1406 ifrp++;
1407 } else {
f23061d4 1408 if (space < (sizeof ifr) + sa->sa_len -
984263bc
MD
1409 sizeof(*sa))
1410 break;
1411 space -= sa->sa_len - sizeof(*sa);
f23061d4
JH
1412 error = copyout(&ifr, ifrp,
1413 sizeof ifr.ifr_name);
984263bc 1414 if (error == 0)
f23061d4
JH
1415 error = copyout(sa, &ifrp->ifr_addr,
1416 sa->sa_len);
984263bc
MD
1417 ifrp = (struct ifreq *)
1418 (sa->sa_len + (caddr_t)&ifrp->ifr_addr);
1419 }
1420 if (error)
1421 break;
f23061d4 1422 space -= sizeof ifr;
984263bc
MD
1423 }
1424 if (error)
1425 break;
1426 if (!addrs) {
f23061d4
JH
1427 bzero(&ifr.ifr_addr, sizeof ifr.ifr_addr);
1428 error = copyout(&ifr, ifrp, sizeof ifr);
984263bc
MD
1429 if (error)
1430 break;
f23061d4 1431 space -= sizeof ifr;
984263bc
MD
1432 ifrp++;
1433 }
1434 }
1435 ifc->ifc_len -= space;
1436 return (error);
1437}
1438
1439/*
1440 * Just like if_promisc(), but for all-multicast-reception mode.
1441 */
1442int
f23061d4 1443if_allmulti(struct ifnet *ifp, int onswitch)
984263bc
MD
1444{
1445 int error = 0;
1446 int s = splimp();
1447 struct ifreq ifr;
1448
1449 if (onswitch) {
1450 if (ifp->if_amcount++ == 0) {
1451 ifp->if_flags |= IFF_ALLMULTI;
1452 ifr.ifr_flags = ifp->if_flags;
46f25451 1453 ifr.ifr_flagshigh = ifp->if_flags >> 16;
bd4539cc
JH
1454 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr,
1455 (struct ucred *)NULL);
984263bc
MD
1456 }
1457 } else {
1458 if (ifp->if_amcount > 1) {
1459 ifp->if_amcount--;
1460 } else {
1461 ifp->if_amcount = 0;
1462 ifp->if_flags &= ~IFF_ALLMULTI;
1463 ifr.ifr_flags = ifp->if_flags;
46f25451 1464 ifr.ifr_flagshigh = ifp->if_flags >> 16;
bd4539cc
JH
1465 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr,
1466 (struct ucred *)NULL);
984263bc
MD
1467 }
1468 }
1469 splx(s);
1470
1471 if (error == 0)
1472 rt_ifmsg(ifp);
1473 return error;
1474}
1475
1476/*
1477 * Add a multicast listenership to the interface in question.
1478 * The link layer provides a routine which converts
1479 */
1480int
f23061d4
JH
1481if_addmulti(
1482 struct ifnet *ifp, /* interface to manipulate */
1483 struct sockaddr *sa, /* address to add */
1484 struct ifmultiaddr **retifma)
984263bc
MD
1485{
1486 struct sockaddr *llsa, *dupsa;
1487 int error, s;
1488 struct ifmultiaddr *ifma;
1489
1490 /*
1491 * If the matching multicast address already exists
1492 * then don't add a new one, just add a reference
1493 */
1494 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
0c3c561c 1495 if (sa_equal(sa, ifma->ifma_addr)) {
984263bc
MD
1496 ifma->ifma_refcount++;
1497 if (retifma)
1498 *retifma = ifma;
1499 return 0;
1500 }
1501 }
1502
1503 /*
1504 * Give the link layer a chance to accept/reject it, and also
1505 * find out which AF_LINK address this maps to, if it isn't one
1506 * already.
1507 */
1508 if (ifp->if_resolvemulti) {
1509 error = ifp->if_resolvemulti(ifp, &llsa, sa);
1510 if (error) return error;
1511 } else {
1512 llsa = 0;
1513 }
1514
1515 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, M_IFMADDR, M_WAITOK);
1516 MALLOC(dupsa, struct sockaddr *, sa->sa_len, M_IFMADDR, M_WAITOK);
1517 bcopy(sa, dupsa, sa->sa_len);
1518
1519 ifma->ifma_addr = dupsa;
1520 ifma->ifma_lladdr = llsa;
1521 ifma->ifma_ifp = ifp;
1522 ifma->ifma_refcount = 1;
1523 ifma->ifma_protospec = 0;
1524 rt_newmaddrmsg(RTM_NEWMADDR, ifma);
1525
1526 /*
1527 * Some network interfaces can scan the address list at
1528 * interrupt time; lock them out.
1529 */
1530 s = splimp();
1531 LIST_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link);
1532 splx(s);
1533 *retifma = ifma;
1534
1535 if (llsa != 0) {
1536 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
0c3c561c 1537 if (sa_equal(ifma->ifma_addr, llsa))
984263bc
MD
1538 break;
1539 }
1540 if (ifma) {
1541 ifma->ifma_refcount++;
1542 } else {
1543 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma,
1544 M_IFMADDR, M_WAITOK);
1545 MALLOC(dupsa, struct sockaddr *, llsa->sa_len,
1546 M_IFMADDR, M_WAITOK);
1547 bcopy(llsa, dupsa, llsa->sa_len);
1548 ifma->ifma_addr = dupsa;
1549 ifma->ifma_ifp = ifp;
1550 ifma->ifma_refcount = 1;
1551 s = splimp();
1552 LIST_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link);
1553 splx(s);
1554 }
1555 }
1556 /*
1557 * We are certain we have added something, so call down to the
1558 * interface to let them know about it.
1559 */
1560 s = splimp();
bd4539cc 1561 ifp->if_ioctl(ifp, SIOCADDMULTI, 0, (struct ucred *)NULL);
984263bc
MD
1562 splx(s);
1563
1564 return 0;
1565}
1566
1567/*
1568 * Remove a reference to a multicast address on this interface. Yell
1569 * if the request does not match an existing membership.
1570 */
1571int
f23061d4 1572if_delmulti(struct ifnet *ifp, struct sockaddr *sa)
984263bc
MD
1573{
1574 struct ifmultiaddr *ifma;
1575 int s;
1576
1577 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link)
0c3c561c 1578 if (sa_equal(sa, ifma->ifma_addr))
984263bc
MD
1579 break;
1580 if (ifma == 0)
1581 return ENOENT;
1582
1583 if (ifma->ifma_refcount > 1) {
1584 ifma->ifma_refcount--;
1585 return 0;
1586 }
1587
1588 rt_newmaddrmsg(RTM_DELMADDR, ifma);
1589 sa = ifma->ifma_lladdr;
1590 s = splimp();
1591 LIST_REMOVE(ifma, ifma_link);
1592 /*
1593 * Make sure the interface driver is notified
1594 * in the case of a link layer mcast group being left.
1595 */
1596 if (ifma->ifma_addr->sa_family == AF_LINK && sa == 0)
bd4539cc 1597 ifp->if_ioctl(ifp, SIOCDELMULTI, 0, (struct ucred *)NULL);
984263bc
MD
1598 splx(s);
1599 free(ifma->ifma_addr, M_IFMADDR);
1600 free(ifma, M_IFMADDR);
1601 if (sa == 0)
1602 return 0;
1603
1604 /*
1605 * Now look for the link-layer address which corresponds to
1606 * this network address. It had been squirreled away in
1607 * ifma->ifma_lladdr for this purpose (so we don't have
1608 * to call ifp->if_resolvemulti() again), and we saved that
1609 * value in sa above. If some nasty deleted the
1610 * link-layer address out from underneath us, we can deal because
1611 * the address we stored was is not the same as the one which was
1612 * in the record for the link-layer address. (So we don't complain
1613 * in that case.)
1614 */
1615 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link)
0c3c561c 1616 if (sa_equal(sa, ifma->ifma_addr))
984263bc
MD
1617 break;
1618 if (ifma == 0)
1619 return 0;
1620
1621 if (ifma->ifma_refcount > 1) {
1622 ifma->ifma_refcount--;
1623 return 0;
1624 }
1625
1626 s = splimp();
1627 LIST_REMOVE(ifma, ifma_link);
bd4539cc 1628 ifp->if_ioctl(ifp, SIOCDELMULTI, 0, (struct ucred *)NULL);
984263bc
MD
1629 splx(s);
1630 free(ifma->ifma_addr, M_IFMADDR);
1631 free(sa, M_IFMADDR);
1632 free(ifma, M_IFMADDR);
1633
1634 return 0;
1635}
1636
1637/*
1638 * Set the link layer address on an interface.
1639 *
1640 * At this time we only support certain types of interfaces,
1641 * and we don't allow the length of the address to change.
1642 */
1643int
1644if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len)
1645{
1646 struct sockaddr_dl *sdl;
1647 struct ifaddr *ifa;
1648 struct ifreq ifr;
1649
1650 ifa = ifnet_addrs[ifp->if_index - 1];
1651 if (ifa == NULL)
1652 return (EINVAL);
1653 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
1654 if (sdl == NULL)
1655 return (EINVAL);
1656 if (len != sdl->sdl_alen) /* don't allow length to change */
1657 return (EINVAL);
1658 switch (ifp->if_type) {
1659 case IFT_ETHER: /* these types use struct arpcom */
1660 case IFT_FDDI:
1661 case IFT_XETHER:
1662 case IFT_ISO88025:
1663 case IFT_L2VLAN:
1664 bcopy(lladdr, ((struct arpcom *)ifp->if_softc)->ac_enaddr, len);
1665 /* FALLTHROUGH */
1666 case IFT_ARCNET:
1667 bcopy(lladdr, LLADDR(sdl), len);
1668 break;
1669 default:
1670 return (ENODEV);
1671 }
1672 /*
1673 * If the interface is already up, we need
1674 * to re-init it in order to reprogram its
1675 * address filter.
1676 */
1677 if ((ifp->if_flags & IFF_UP) != 0) {
1678 ifp->if_flags &= ~IFF_UP;
1679 ifr.ifr_flags = ifp->if_flags;
46f25451 1680 ifr.ifr_flagshigh = ifp->if_flags >> 16;
bd4539cc
JH
1681 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr,
1682 (struct ucred *)NULL);
984263bc
MD
1683 ifp->if_flags |= IFF_UP;
1684 ifr.ifr_flags = ifp->if_flags;
46f25451 1685 ifr.ifr_flagshigh = ifp->if_flags >> 16;
bd4539cc
JH
1686 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr,
1687 (struct ucred *)NULL);
984263bc
MD
1688#ifdef INET
1689 /*
1690 * Also send gratuitous ARPs to notify other nodes about
1691 * the address change.
1692 */
1693 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1694 if (ifa->ifa_addr != NULL &&
1695 ifa->ifa_addr->sa_family == AF_INET)
1696 arp_ifinit(ifp, ifa);
1697 }
1698#endif
1699 }
1700 return (0);
1701}
1702
1703struct ifmultiaddr *
f23061d4 1704ifmaof_ifpforaddr(struct sockaddr *sa, struct ifnet *ifp)
984263bc
MD
1705{
1706 struct ifmultiaddr *ifma;
1707
1708 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link)
0c3c561c 1709 if (sa_equal(ifma->ifma_addr, sa))
984263bc
MD
1710 break;
1711
1712 return ifma;
1713}
1714
1550dfd9
MD
1715/*
1716 * The name argument must be a pointer to storage which will last as
1717 * long as the interface does. For physical devices, the result of
1718 * device_get_name(dev) is a good choice and for pseudo-devices a
1719 * static string works well.
1720 */
1721void
1722if_initname(struct ifnet *ifp, const char *name, int unit)
1723{
3e4a09e7
MD
1724 ifp->if_dname = name;
1725 ifp->if_dunit = unit;
1550dfd9
MD
1726 if (unit != IF_DUNIT_NONE)
1727 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit);
1728 else
1729 strlcpy(ifp->if_xname, name, IFNAMSIZ);
1730}
1731
984263bc
MD
1732int
1733if_printf(struct ifnet *ifp, const char *fmt, ...)
1734{
e2565a42 1735 __va_list ap;
984263bc
MD
1736 int retval;
1737
3e4a09e7 1738 retval = printf("%s: ", ifp->if_xname);
e2565a42 1739 __va_start(ap, fmt);
984263bc 1740 retval += vprintf(fmt, ap);
e2565a42 1741 __va_end(ap);
984263bc
MD
1742 return (retval);
1743}
1744
1745SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers");
1746SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management");