Update the systat manual page to reflect the new -ifstat option.
[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
34 * $FreeBSD: src/sys/net/if.c,v 1.85.2.23 2003/04/15 18:11:19 fjoe Exp $
fb0820e5 35 * $DragonFly: src/sys/net/if.c,v 1.8 2003/09/14 16:35:58 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>
47#include <sys/socket.h>
48#include <sys/socketvar.h>
49#include <sys/protosw.h>
50#include <sys/kernel.h>
51#include <sys/sockio.h>
52#include <sys/syslog.h>
53#include <sys/sysctl.h>
54
55#include <net/if.h>
56#include <net/if_arp.h>
57#include <net/if_dl.h>
58#include <net/if_types.h>
59#include <net/if_var.h>
60#include <net/radix.h>
61#include <net/route.h>
62#include <machine/stdarg.h>
63
64#if defined(INET) || defined(INET6)
65/*XXX*/
66#include <netinet/in.h>
67#include <netinet/in_var.h>
68#include <netinet/if_ether.h>
69#ifdef INET6
70#include <machine/clock.h> /* XXX: temporal workaround for fxp issue */
71#include <netinet6/in6_var.h>
72#include <netinet6/in6_ifattach.h>
73#endif
74#endif
75
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76#if defined(COMPAT_43)
77#include <emulation/43bsd/43bsd_socket.h>
78#endif /* COMPAT_43 */
79
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80/*
81 * System initialization
82 */
83
158abb01
RG
84static int ifconf (u_long, caddr_t);
85static void ifinit (void *);
86static void if_qflush (struct ifqueue *);
87static void if_slowtimo (void *);
88static void link_rtrequest (int, struct rtentry *, struct rt_addrinfo *);
89static int if_rtdel (struct radix_node *, void *);
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90
91SYSINIT(interfaces, SI_SUB_PROTO_IF, SI_ORDER_FIRST, ifinit, NULL)
92
93MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address");
94MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address");
95
96int ifqmaxlen = IFQ_MAXLEN;
97struct ifnethead ifnet; /* depend on static init XXX */
98
99#ifdef INET6
100/*
101 * XXX: declare here to avoid to include many inet6 related files..
102 * should be more generalized?
103 */
158abb01 104extern void nd6_setmtu (struct ifnet *);
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105#endif
106
158abb01
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107struct if_clone *if_clone_lookup (const char *, int *);
108int if_clone_list (struct if_clonereq *);
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109
110LIST_HEAD(, if_clone) if_cloners = LIST_HEAD_INITIALIZER(if_cloners);
111int if_cloners_count;
112
113/*
114 * Network interface utility routines.
115 *
116 * Routines with ifa_ifwith* names take sockaddr *'s as
117 * parameters.
118 */
119/* ARGSUSED*/
120void
121ifinit(dummy)
122 void *dummy;
123{
124 struct ifnet *ifp;
125 int s;
126
127 s = splimp();
128 TAILQ_FOREACH(ifp, &ifnet, if_link) {
129 if (ifp->if_snd.ifq_maxlen == 0) {
130 printf("%s%d XXX: driver didn't set ifq_maxlen\n",
131 ifp->if_name, ifp->if_unit);
132 ifp->if_snd.ifq_maxlen = ifqmaxlen;
133 }
134 }
135 splx(s);
136 if_slowtimo(0);
137}
138
139int if_index = 0;
140struct ifaddr **ifnet_addrs;
141struct ifnet **ifindex2ifnet = NULL;
142
143
144/*
145 * Attach an interface to the
146 * list of "active" interfaces.
147 */
148void
149if_attach(ifp)
150 struct ifnet *ifp;
151{
152 unsigned socksize, ifasize;
153 int namelen, masklen;
154 char workbuf[64];
82ed7fc2
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155 struct sockaddr_dl *sdl;
156 struct ifaddr *ifa;
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157 static int if_indexlim = 8;
158 static int inited;
159
160 if (!inited) {
161 TAILQ_INIT(&ifnet);
162 inited = 1;
163 }
164
165 TAILQ_INSERT_TAIL(&ifnet, ifp, if_link);
166 ifp->if_index = ++if_index;
167 /*
168 * XXX -
169 * The old code would work if the interface passed a pre-existing
170 * chain of ifaddrs to this code. We don't trust our callers to
171 * properly initialize the tailq, however, so we no longer allow
172 * this unlikely case.
173 */
174 TAILQ_INIT(&ifp->if_addrhead);
175 TAILQ_INIT(&ifp->if_prefixhead);
176 LIST_INIT(&ifp->if_multiaddrs);
177 getmicrotime(&ifp->if_lastchange);
178 if (ifnet_addrs == 0 || if_index >= if_indexlim) {
179 unsigned n = (if_indexlim <<= 1) * sizeof(ifa);
180 caddr_t q = malloc(n, M_IFADDR, M_WAITOK);
181 bzero(q, n);
182 if (ifnet_addrs) {
183 bcopy((caddr_t)ifnet_addrs, (caddr_t)q, n/2);
184 free((caddr_t)ifnet_addrs, M_IFADDR);
185 }
186 ifnet_addrs = (struct ifaddr **)q;
187
188 /* grow ifindex2ifnet */
189 n = if_indexlim * sizeof(struct ifnet *);
190 q = malloc(n, M_IFADDR, M_WAITOK);
191 bzero(q, n);
192 if (ifindex2ifnet) {
193 bcopy((caddr_t)ifindex2ifnet, q, n/2);
194 free((caddr_t)ifindex2ifnet, M_IFADDR);
195 }
196 ifindex2ifnet = (struct ifnet **)q;
197 }
198
199 ifindex2ifnet[if_index] = ifp;
200
201 /*
202 * create a Link Level name for this device
203 */
204 namelen = snprintf(workbuf, sizeof(workbuf),
205 "%s%d", ifp->if_name, ifp->if_unit);
206#define _offsetof(t, m) ((int)((caddr_t)&((t *)0)->m))
207 masklen = _offsetof(struct sockaddr_dl, sdl_data[0]) + namelen;
208 socksize = masklen + ifp->if_addrlen;
209#define ROUNDUP(a) (1 + (((a) - 1) | (sizeof(long) - 1)))
210 if (socksize < sizeof(*sdl))
211 socksize = sizeof(*sdl);
212 socksize = ROUNDUP(socksize);
213 ifasize = sizeof(*ifa) + 2 * socksize;
214 ifa = (struct ifaddr *)malloc(ifasize, M_IFADDR, M_WAITOK);
215 if (ifa) {
216 bzero((caddr_t)ifa, ifasize);
217 sdl = (struct sockaddr_dl *)(ifa + 1);
218 sdl->sdl_len = socksize;
219 sdl->sdl_family = AF_LINK;
220 bcopy(workbuf, sdl->sdl_data, namelen);
221 sdl->sdl_nlen = namelen;
222 sdl->sdl_index = ifp->if_index;
223 sdl->sdl_type = ifp->if_type;
224 ifnet_addrs[if_index - 1] = ifa;
225 ifa->ifa_ifp = ifp;
226 ifa->ifa_rtrequest = link_rtrequest;
227 ifa->ifa_addr = (struct sockaddr *)sdl;
228 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl);
229 ifa->ifa_netmask = (struct sockaddr *)sdl;
230 sdl->sdl_len = masklen;
231 while (namelen != 0)
232 sdl->sdl_data[--namelen] = 0xff;
233 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link);
234 }
235
236 /* Announce the interface. */
237 rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
238}
239
240/*
241 * Detach an interface, removing it from the
242 * list of "active" interfaces.
243 */
244void
245if_detach(ifp)
246 struct ifnet *ifp;
247{
248 struct ifaddr *ifa;
249 struct radix_node_head *rnh;
250 int s;
251 int i;
252
253 /*
254 * Remove routes and flush queues.
255 */
256 s = splnet();
257 if_down(ifp);
258
259 /*
260 * Remove address from ifnet_addrs[] and maybe decrement if_index.
261 * Clean up all addresses.
262 */
263 ifnet_addrs[ifp->if_index - 1] = 0;
264 while (if_index > 0 && ifnet_addrs[if_index - 1] == 0)
265 if_index--;
266
267 for (ifa = TAILQ_FIRST(&ifp->if_addrhead); ifa;
268 ifa = TAILQ_FIRST(&ifp->if_addrhead)) {
269#ifdef INET
270 /* XXX: Ugly!! ad hoc just for INET */
271 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET) {
272 struct ifaliasreq ifr;
273
274 bzero(&ifr, sizeof(ifr));
275 ifr.ifra_addr = *ifa->ifa_addr;
276 if (ifa->ifa_dstaddr)
277 ifr.ifra_broadaddr = *ifa->ifa_dstaddr;
278 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp,
279 NULL) == 0)
280 continue;
281 }
282#endif /* INET */
283#ifdef INET6
284 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET6) {
285 in6_purgeaddr(ifa);
286 /* ifp_addrhead is already updated */
287 continue;
288 }
289#endif /* INET6 */
290 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link);
291 IFAFREE(ifa);
292 }
293
294#ifdef INET6
295 /*
296 * Remove all IPv6 kernel structs related to ifp. This should be done
297 * before removing routing entries below, since IPv6 interface direct
298 * routes are expected to be removed by the IPv6-specific kernel API.
299 * Otherwise, the kernel will detect some inconsistency and bark it.
300 */
301 in6_ifdetach(ifp);
302#endif
303
304 /*
305 * Delete all remaining routes using this interface
306 * Unfortuneatly the only way to do this is to slog through
307 * the entire routing table looking for routes which point
308 * to this interface...oh well...
309 */
310 for (i = 1; i <= AF_MAX; i++) {
311 if ((rnh = rt_tables[i]) == NULL)
312 continue;
313 (void) rnh->rnh_walktree(rnh, if_rtdel, ifp);
314 }
315
316 /* Announce that the interface is gone. */
317 rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
318
319 TAILQ_REMOVE(&ifnet, ifp, if_link);
320 splx(s);
321}
322
323/*
324 * Delete Routes for a Network Interface
325 *
326 * Called for each routing entry via the rnh->rnh_walktree() call above
327 * to delete all route entries referencing a detaching network interface.
328 *
329 * Arguments:
330 * rn pointer to node in the routing table
331 * arg argument passed to rnh->rnh_walktree() - detaching interface
332 *
333 * Returns:
334 * 0 successful
335 * errno failed - reason indicated
336 *
337 */
338static int
339if_rtdel(rn, arg)
340 struct radix_node *rn;
341 void *arg;
342{
343 struct rtentry *rt = (struct rtentry *)rn;
344 struct ifnet *ifp = arg;
345 int err;
346
347 if (rt->rt_ifp == ifp) {
348
349 /*
350 * Protect (sorta) against walktree recursion problems
351 * with cloned routes
352 */
353 if ((rt->rt_flags & RTF_UP) == 0)
354 return (0);
355
356 err = rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway,
357 rt_mask(rt), rt->rt_flags,
358 (struct rtentry **) NULL);
359 if (err) {
360 log(LOG_WARNING, "if_rtdel: error %d\n", err);
361 }
362 }
363
364 return (0);
365}
366
367/*
368 * Create a clone network interface.
369 */
370int
371if_clone_create(name, len)
372 char *name;
373 int len;
374{
375 struct if_clone *ifc;
376 char *dp;
377 int wildcard;
378 int unit;
379 int err;
380
381 ifc = if_clone_lookup(name, &unit);
382 if (ifc == NULL)
383 return (EINVAL);
384
385 if (ifunit(name) != NULL)
386 return (EEXIST);
387
388 wildcard = (unit < 0);
389
390 err = (*ifc->ifc_create)(ifc, &unit);
391 if (err != 0)
392 return (err);
393
394 /* In the wildcard case, we need to update the name. */
395 if (wildcard) {
396 for (dp = name; *dp != '\0'; dp++);
397 if (snprintf(dp, len - (dp-name), "%d", unit) >
398 len - (dp-name) - 1) {
399 /*
400 * This can only be a programmer error and
401 * there's no straightforward way to recover if
402 * it happens.
403 */
404 panic("if_clone_create(): interface name too long");
405 }
406
407 }
408
409 return (0);
410}
411
412/*
413 * Destroy a clone network interface.
414 */
415int
416if_clone_destroy(name)
417 const char *name;
418{
419 struct if_clone *ifc;
420 struct ifnet *ifp;
421
422 ifc = if_clone_lookup(name, NULL);
423 if (ifc == NULL)
424 return (EINVAL);
425
426 ifp = ifunit(name);
427 if (ifp == NULL)
428 return (ENXIO);
429
430 if (ifc->ifc_destroy == NULL)
431 return (EOPNOTSUPP);
432
433 (*ifc->ifc_destroy)(ifp);
434 return (0);
435}
436
437/*
438 * Look up a network interface cloner.
439 */
440struct if_clone *
441if_clone_lookup(name, unitp)
442 const char *name;
443 int *unitp;
444{
445 struct if_clone *ifc;
446 const char *cp;
447 int i;
448
449 for (ifc = LIST_FIRST(&if_cloners); ifc != NULL;) {
450 for (cp = name, i = 0; i < ifc->ifc_namelen; i++, cp++) {
451 if (ifc->ifc_name[i] != *cp)
452 goto next_ifc;
453 }
454 goto found_name;
455 next_ifc:
456 ifc = LIST_NEXT(ifc, ifc_list);
457 }
458
459 /* No match. */
460 return ((struct if_clone *)NULL);
461
462 found_name:
463 if (*cp == '\0') {
464 i = -1;
465 } else {
466 for (i = 0; *cp != '\0'; cp++) {
467 if (*cp < '0' || *cp > '9') {
468 /* Bogus unit number. */
469 return (NULL);
470 }
471 i = (i * 10) + (*cp - '0');
472 }
473 }
474
475 if (unitp != NULL)
476 *unitp = i;
477 return (ifc);
478}
479
480/*
481 * Register a network interface cloner.
482 */
483void
484if_clone_attach(ifc)
485 struct if_clone *ifc;
486{
487
488 LIST_INSERT_HEAD(&if_cloners, ifc, ifc_list);
489 if_cloners_count++;
490}
491
492/*
493 * Unregister a network interface cloner.
494 */
495void
496if_clone_detach(ifc)
497 struct if_clone *ifc;
498{
499
500 LIST_REMOVE(ifc, ifc_list);
501 if_cloners_count--;
502}
503
504/*
505 * Provide list of interface cloners to userspace.
506 */
507int
508if_clone_list(ifcr)
509 struct if_clonereq *ifcr;
510{
511 char outbuf[IFNAMSIZ], *dst;
512 struct if_clone *ifc;
513 int count, error = 0;
514
515 ifcr->ifcr_total = if_cloners_count;
516 if ((dst = ifcr->ifcr_buffer) == NULL) {
517 /* Just asking how many there are. */
518 return (0);
519 }
520
521 if (ifcr->ifcr_count < 0)
522 return (EINVAL);
523
524 count = (if_cloners_count < ifcr->ifcr_count) ?
525 if_cloners_count : ifcr->ifcr_count;
526
527 for (ifc = LIST_FIRST(&if_cloners); ifc != NULL && count != 0;
528 ifc = LIST_NEXT(ifc, ifc_list), count--, dst += IFNAMSIZ) {
529 strncpy(outbuf, ifc->ifc_name, IFNAMSIZ);
530 outbuf[IFNAMSIZ - 1] = '\0'; /* sanity */
531 error = copyout(outbuf, dst, IFNAMSIZ);
532 if (error)
533 break;
534 }
535
536 return (error);
537}
538
539/*
540 * Locate an interface based on a complete address.
541 */
542/*ARGSUSED*/
543struct ifaddr *
544ifa_ifwithaddr(addr)
82ed7fc2 545 struct sockaddr *addr;
984263bc 546{
82ed7fc2
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547 struct ifnet *ifp;
548 struct ifaddr *ifa;
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549
550#define equal(a1, a2) \
551 (bcmp((caddr_t)(a1), (caddr_t)(a2), ((struct sockaddr *)(a1))->sa_len) == 0)
552 TAILQ_FOREACH(ifp, &ifnet, if_link)
553 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
554 if (ifa->ifa_addr->sa_family != addr->sa_family)
555 continue;
556 if (equal(addr, ifa->ifa_addr))
557 return (ifa);
558 if ((ifp->if_flags & IFF_BROADCAST) && ifa->ifa_broadaddr &&
559 /* IP6 doesn't have broadcast */
560 ifa->ifa_broadaddr->sa_len != 0 &&
561 equal(ifa->ifa_broadaddr, addr))
562 return (ifa);
563 }
564 return ((struct ifaddr *)0);
565}
566/*
567 * Locate the point to point interface with a given destination address.
568 */
569/*ARGSUSED*/
570struct ifaddr *
571ifa_ifwithdstaddr(addr)
82ed7fc2 572 struct sockaddr *addr;
984263bc 573{
82ed7fc2
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574 struct ifnet *ifp;
575 struct ifaddr *ifa;
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576
577 TAILQ_FOREACH(ifp, &ifnet, if_link)
578 if (ifp->if_flags & IFF_POINTOPOINT)
579 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
580 if (ifa->ifa_addr->sa_family != addr->sa_family)
581 continue;
582 if (ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr))
583 return (ifa);
584 }
585 return ((struct ifaddr *)0);
586}
587
588/*
589 * Find an interface on a specific network. If many, choice
590 * is most specific found.
591 */
592struct ifaddr *
593ifa_ifwithnet(addr)
594 struct sockaddr *addr;
595{
82ed7fc2
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596 struct ifnet *ifp;
597 struct ifaddr *ifa;
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598 struct ifaddr *ifa_maybe = (struct ifaddr *) 0;
599 u_int af = addr->sa_family;
600 char *addr_data = addr->sa_data, *cplim;
601
602 /*
603 * AF_LINK addresses can be looked up directly by their index number,
604 * so do that if we can.
605 */
606 if (af == AF_LINK) {
82ed7fc2 607 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr;
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608 if (sdl->sdl_index && sdl->sdl_index <= if_index)
609 return (ifnet_addrs[sdl->sdl_index - 1]);
610 }
611
612 /*
613 * Scan though each interface, looking for ones that have
614 * addresses in this address family.
615 */
616 TAILQ_FOREACH(ifp, &ifnet, if_link) {
617 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
82ed7fc2 618 char *cp, *cp2, *cp3;
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619
620 if (ifa->ifa_addr->sa_family != af)
621next: continue;
622 if (af == AF_INET && ifp->if_flags & IFF_POINTOPOINT) {
623 /*
624 * This is a bit broken as it doesn't
625 * take into account that the remote end may
626 * be a single node in the network we are
627 * looking for.
628 * The trouble is that we don't know the
629 * netmask for the remote end.
630 */
631 if (ifa->ifa_dstaddr != 0
632 && equal(addr, ifa->ifa_dstaddr))
633 return (ifa);
634 } else {
635 /*
636 * if we have a special address handler,
637 * then use it instead of the generic one.
638 */
639 if (ifa->ifa_claim_addr) {
640 if ((*ifa->ifa_claim_addr)(ifa, addr)) {
641 return (ifa);
642 } else {
643 continue;
644 }
645 }
646
647 /*
648 * Scan all the bits in the ifa's address.
649 * If a bit dissagrees with what we are
650 * looking for, mask it with the netmask
651 * to see if it really matters.
652 * (A byte at a time)
653 */
654 if (ifa->ifa_netmask == 0)
655 continue;
656 cp = addr_data;
657 cp2 = ifa->ifa_addr->sa_data;
658 cp3 = ifa->ifa_netmask->sa_data;
659 cplim = ifa->ifa_netmask->sa_len
660 + (char *)ifa->ifa_netmask;
661 while (cp3 < cplim)
662 if ((*cp++ ^ *cp2++) & *cp3++)
663 goto next; /* next address! */
664 /*
665 * If the netmask of what we just found
666 * is more specific than what we had before
667 * (if we had one) then remember the new one
668 * before continuing to search
669 * for an even better one.
670 */
671 if (ifa_maybe == 0 ||
672 rn_refines((caddr_t)ifa->ifa_netmask,
673 (caddr_t)ifa_maybe->ifa_netmask))
674 ifa_maybe = ifa;
675 }
676 }
677 }
678 return (ifa_maybe);
679}
680
681/*
682 * Find an interface address specific to an interface best matching
683 * a given address.
684 */
685struct ifaddr *
686ifaof_ifpforaddr(addr, ifp)
687 struct sockaddr *addr;
82ed7fc2 688 struct ifnet *ifp;
984263bc 689{
82ed7fc2
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690 struct ifaddr *ifa;
691 char *cp, *cp2, *cp3;
692 char *cplim;
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693 struct ifaddr *ifa_maybe = 0;
694 u_int af = addr->sa_family;
695
696 if (af >= AF_MAX)
697 return (0);
698 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
699 if (ifa->ifa_addr->sa_family != af)
700 continue;
701 if (ifa_maybe == 0)
702 ifa_maybe = ifa;
703 if (ifa->ifa_netmask == 0) {
704 if (equal(addr, ifa->ifa_addr) ||
705 (ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr)))
706 return (ifa);
707 continue;
708 }
709 if (ifp->if_flags & IFF_POINTOPOINT) {
710 if (equal(addr, ifa->ifa_dstaddr))
711 return (ifa);
712 } else {
713 cp = addr->sa_data;
714 cp2 = ifa->ifa_addr->sa_data;
715 cp3 = ifa->ifa_netmask->sa_data;
716 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask;
717 for (; cp3 < cplim; cp3++)
718 if ((*cp++ ^ *cp2++) & *cp3)
719 break;
720 if (cp3 == cplim)
721 return (ifa);
722 }
723 }
724 return (ifa_maybe);
725}
726
727#include <net/route.h>
728
729/*
730 * Default action when installing a route with a Link Level gateway.
731 * Lookup an appropriate real ifa to point to.
732 * This should be moved to /sys/net/link.c eventually.
733 */
734static void
735link_rtrequest(cmd, rt, info)
736 int cmd;
82ed7fc2 737 struct rtentry *rt;
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738 struct rt_addrinfo *info;
739{
82ed7fc2 740 struct ifaddr *ifa;
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741 struct sockaddr *dst;
742 struct ifnet *ifp;
743
744 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) ||
745 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0))
746 return;
747 ifa = ifaof_ifpforaddr(dst, ifp);
748 if (ifa) {
749 IFAFREE(rt->rt_ifa);
750 rt->rt_ifa = ifa;
751 ifa->ifa_refcnt++;
752 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest)
753 ifa->ifa_rtrequest(cmd, rt, info);
754 }
755}
756
757/*
758 * Mark an interface down and notify protocols of
759 * the transition.
760 * NOTE: must be called at splnet or eqivalent.
761 */
762void
763if_unroute(ifp, flag, fam)
82ed7fc2 764 struct ifnet *ifp;
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765 int flag, fam;
766{
82ed7fc2 767 struct ifaddr *ifa;
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768
769 ifp->if_flags &= ~flag;
770 getmicrotime(&ifp->if_lastchange);
771 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
772 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family))
773 pfctlinput(PRC_IFDOWN, ifa->ifa_addr);
774 if_qflush(&ifp->if_snd);
775 rt_ifmsg(ifp);
776}
777
778/*
779 * Mark an interface up and notify protocols of
780 * the transition.
781 * NOTE: must be called at splnet or eqivalent.
782 */
783void
784if_route(ifp, flag, fam)
82ed7fc2 785 struct ifnet *ifp;
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786 int flag, fam;
787{
82ed7fc2 788 struct ifaddr *ifa;
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789
790 ifp->if_flags |= flag;
791 getmicrotime(&ifp->if_lastchange);
792 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
793 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family))
794 pfctlinput(PRC_IFUP, ifa->ifa_addr);
795 rt_ifmsg(ifp);
796#ifdef INET6
797 in6_if_up(ifp);
798#endif
799}
800
801/*
802 * Mark an interface down and notify protocols of
803 * the transition.
804 * NOTE: must be called at splnet or eqivalent.
805 */
806void
807if_down(ifp)
82ed7fc2 808 struct ifnet *ifp;
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809{
810
811 if_unroute(ifp, IFF_UP, AF_UNSPEC);
812}
813
814/*
815 * Mark an interface up and notify protocols of
816 * the transition.
817 * NOTE: must be called at splnet or eqivalent.
818 */
819void
820if_up(ifp)
82ed7fc2 821 struct ifnet *ifp;
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822{
823
824 if_route(ifp, IFF_UP, AF_UNSPEC);
825}
826
827/*
828 * Flush an interface queue.
829 */
830static void
831if_qflush(ifq)
82ed7fc2 832 struct ifqueue *ifq;
984263bc 833{
82ed7fc2 834 struct mbuf *m, *n;
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835
836 n = ifq->ifq_head;
837 while ((m = n) != 0) {
838 n = m->m_act;
839 m_freem(m);
840 }
841 ifq->ifq_head = 0;
842 ifq->ifq_tail = 0;
843 ifq->ifq_len = 0;
844}
845
846/*
847 * Handle interface watchdog timer routines. Called
848 * from softclock, we decrement timers (if set) and
849 * call the appropriate interface routine on expiration.
850 */
851static void
852if_slowtimo(arg)
853 void *arg;
854{
82ed7fc2 855 struct ifnet *ifp;
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856 int s = splimp();
857
858 TAILQ_FOREACH(ifp, &ifnet, if_link) {
859 if (ifp->if_timer == 0 || --ifp->if_timer)
860 continue;
861 if (ifp->if_watchdog)
862 (*ifp->if_watchdog)(ifp);
863 }
864 splx(s);
865 timeout(if_slowtimo, (void *)0, hz / IFNET_SLOWHZ);
866}
867
868/*
869 * Map interface name to
870 * interface structure pointer.
871 */
872struct ifnet *
873ifunit(const char *name)
874{
875 char namebuf[IFNAMSIZ + 1];
876 const char *cp;
877 struct ifnet *ifp;
878 int unit;
879 unsigned len, m;
880 char c;
881
882 len = strlen(name);
883 if (len < 2 || len > IFNAMSIZ)
884 return NULL;
885 cp = name + len - 1;
886 c = *cp;
887 if (c < '0' || c > '9')
888 return NULL; /* trailing garbage */
889 unit = 0;
890 m = 1;
891 do {
892 if (cp == name)
893 return NULL; /* no interface name */
894 unit += (c - '0') * m;
895 if (unit > 1000000)
896 return NULL; /* number is unreasonable */
897 m *= 10;
898 c = *--cp;
899 } while (c >= '0' && c <= '9');
900 len = cp - name + 1;
901 bcopy(name, namebuf, len);
902 namebuf[len] = '\0';
903 /*
904 * Now search all the interfaces for this name/number
905 */
906 TAILQ_FOREACH(ifp, &ifnet, if_link) {
907 if (strcmp(ifp->if_name, namebuf))
908 continue;
909 if (unit == ifp->if_unit)
910 break;
911 }
912 return (ifp);
913}
914
915
916/*
917 * Map interface name in a sockaddr_dl to
918 * interface structure pointer.
919 */
920struct ifnet *
921if_withname(sa)
922 struct sockaddr *sa;
923{
924 char ifname[IFNAMSIZ+1];
925 struct sockaddr_dl *sdl = (struct sockaddr_dl *)sa;
926
927 if ( (sa->sa_family != AF_LINK) || (sdl->sdl_nlen == 0) ||
928 (sdl->sdl_nlen > IFNAMSIZ) )
929 return NULL;
930
931 /*
932 * ifunit wants a null-terminated name. It may not be null-terminated
933 * in the sockaddr. We don't want to change the caller's sockaddr,
934 * and there might not be room to put the trailing null anyway, so we
935 * make a local copy that we know we can null terminate safely.
936 */
937
938 bcopy(sdl->sdl_data, ifname, sdl->sdl_nlen);
939 ifname[sdl->sdl_nlen] = '\0';
940 return ifunit(ifname);
941}
942
943
944/*
945 * Interface ioctls.
946 */
947int
dadab5e9 948ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td)
984263bc 949{
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950 struct ifnet *ifp;
951 struct ifreq *ifr;
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952 struct ifstat *ifs;
953 int error;
954 short oif_flags;
955 int new_flags;
956
957 switch (cmd) {
958
959 case SIOCGIFCONF:
960 case OSIOCGIFCONF:
961 return (ifconf(cmd, data));
962 }
963 ifr = (struct ifreq *)data;
964
965 switch (cmd) {
966 case SIOCIFCREATE:
967 case SIOCIFDESTROY:
dadab5e9 968 if ((error = suser(td)) != 0)
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969 return (error);
970 return ((cmd == SIOCIFCREATE) ?
971 if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name)) :
972 if_clone_destroy(ifr->ifr_name));
973
974 case SIOCIFGCLONERS:
975 return (if_clone_list((struct if_clonereq *)data));
976 }
977
978 ifp = ifunit(ifr->ifr_name);
979 if (ifp == 0)
980 return (ENXIO);
981 switch (cmd) {
982
983 case SIOCGIFFLAGS:
984 ifr->ifr_flags = ifp->if_flags;
985 ifr->ifr_flagshigh = ifp->if_ipending >> 16;
986 break;
987
988 case SIOCGIFCAP:
989 ifr->ifr_reqcap = ifp->if_capabilities;
990 ifr->ifr_curcap = ifp->if_capenable;
991 break;
992
993 case SIOCGIFMETRIC:
994 ifr->ifr_metric = ifp->if_metric;
995 break;
996
997 case SIOCGIFMTU:
998 ifr->ifr_mtu = ifp->if_mtu;
999 break;
1000
1001 case SIOCGIFPHYS:
1002 ifr->ifr_phys = ifp->if_physical;
1003 break;
1004
1005 case SIOCSIFFLAGS:
dadab5e9 1006 error = suser(td);
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1007 if (error)
1008 return (error);
1009 new_flags = (ifr->ifr_flags & 0xffff) |
1010 (ifr->ifr_flagshigh << 16);
1011 if (ifp->if_flags & IFF_SMART) {
1012 /* Smart drivers twiddle their own routes */
1013 } else if (ifp->if_flags & IFF_UP &&
1014 (new_flags & IFF_UP) == 0) {
1015 int s = splimp();
1016 if_down(ifp);
1017 splx(s);
1018 } else if (new_flags & IFF_UP &&
1019 (ifp->if_flags & IFF_UP) == 0) {
1020 int s = splimp();
1021 if_up(ifp);
1022 splx(s);
1023 }
1024 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) |
1025 (new_flags &~ IFF_CANTCHANGE);
1026 ifp->if_ipending = (ifp->if_ipending & IFF_CANTCHANGE) |
1027 (new_flags &~ IFF_CANTCHANGE);
1028 if (new_flags & IFF_PPROMISC) {
1029 /* Permanently promiscuous mode requested */
1030 ifp->if_flags |= IFF_PROMISC;
1031 } else if (ifp->if_pcount == 0) {
1032 ifp->if_flags &= ~IFF_PROMISC;
1033 }
1034 if (ifp->if_ioctl)
1035 (void) (*ifp->if_ioctl)(ifp, cmd, data);
1036 getmicrotime(&ifp->if_lastchange);
1037 break;
1038
1039 case SIOCSIFCAP:
dadab5e9 1040 error = suser(td);
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1041 if (error)
1042 return (error);
1043 if (ifr->ifr_reqcap & ~ifp->if_capabilities)
1044 return (EINVAL);
1045 (void) (*ifp->if_ioctl)(ifp, cmd, data);
1046 break;
1047
1048 case SIOCSIFMETRIC:
dadab5e9 1049 error = suser(td);
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1050 if (error)
1051 return (error);
1052 ifp->if_metric = ifr->ifr_metric;
1053 getmicrotime(&ifp->if_lastchange);
1054 break;
1055
1056 case SIOCSIFPHYS:
dadab5e9 1057 error = suser(td);
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1058 if (error)
1059 return error;
1060 if (!ifp->if_ioctl)
1061 return EOPNOTSUPP;
1062 error = (*ifp->if_ioctl)(ifp, cmd, data);
1063 if (error == 0)
1064 getmicrotime(&ifp->if_lastchange);
1065 return(error);
1066
1067 case SIOCSIFMTU:
1068 {
1069 u_long oldmtu = ifp->if_mtu;
1070
dadab5e9 1071 error = suser(td);
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1072 if (error)
1073 return (error);
1074 if (ifp->if_ioctl == NULL)
1075 return (EOPNOTSUPP);
1076 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU)
1077 return (EINVAL);
1078 error = (*ifp->if_ioctl)(ifp, cmd, data);
1079 if (error == 0) {
1080 getmicrotime(&ifp->if_lastchange);
1081 rt_ifmsg(ifp);
1082 }
1083 /*
1084 * If the link MTU changed, do network layer specific procedure.
1085 */
1086 if (ifp->if_mtu != oldmtu) {
1087#ifdef INET6
1088 nd6_setmtu(ifp);
1089#endif
1090 }
1091 return (error);
1092 }
1093
1094 case SIOCADDMULTI:
1095 case SIOCDELMULTI:
dadab5e9 1096 error = suser(td);
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1097 if (error)
1098 return (error);
1099
1100 /* Don't allow group membership on non-multicast interfaces. */
1101 if ((ifp->if_flags & IFF_MULTICAST) == 0)
1102 return EOPNOTSUPP;
1103
1104 /* Don't let users screw up protocols' entries. */
1105 if (ifr->ifr_addr.sa_family != AF_LINK)
1106 return EINVAL;
1107
1108 if (cmd == SIOCADDMULTI) {
1109 struct ifmultiaddr *ifma;
1110 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma);
1111 } else {
1112 error = if_delmulti(ifp, &ifr->ifr_addr);
1113 }
1114 if (error == 0)
1115 getmicrotime(&ifp->if_lastchange);
1116 return error;
1117
1118 case SIOCSIFPHYADDR:
1119 case SIOCDIFPHYADDR:
1120#ifdef INET6
1121 case SIOCSIFPHYADDR_IN6:
1122#endif
1123 case SIOCSLIFPHYADDR:
1124 case SIOCSIFMEDIA:
1125 case SIOCSIFGENERIC:
dadab5e9 1126 error = suser(td);
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1127 if (error)
1128 return (error);
1129 if (ifp->if_ioctl == 0)
1130 return (EOPNOTSUPP);
1131 error = (*ifp->if_ioctl)(ifp, cmd, data);
1132 if (error == 0)
1133 getmicrotime(&ifp->if_lastchange);
1134 return error;
1135
1136 case SIOCGIFSTATUS:
1137 ifs = (struct ifstat *)data;
1138 ifs->ascii[0] = '\0';
1139
1140 case SIOCGIFPSRCADDR:
1141 case SIOCGIFPDSTADDR:
1142 case SIOCGLIFPHYADDR:
1143 case SIOCGIFMEDIA:
1144 case SIOCGIFGENERIC:
1145 if (ifp->if_ioctl == 0)
1146 return (EOPNOTSUPP);
1147 return ((*ifp->if_ioctl)(ifp, cmd, data));
1148
1149 case SIOCSIFLLADDR:
dadab5e9 1150 error = suser(td);
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1151 if (error)
1152 return (error);
1153 return if_setlladdr(ifp,
1154 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len);
1155
1156 default:
1157 oif_flags = ifp->if_flags;
1158 if (so->so_proto == 0)
1159 return (EOPNOTSUPP);
1160#ifndef COMPAT_43
1161 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd,
1162 data,
fb0820e5 1163 ifp, td));
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1164#else
1165 {
1166 int ocmd = cmd;
1167
1168 switch (cmd) {
1169
1170 case SIOCSIFDSTADDR:
1171 case SIOCSIFADDR:
1172 case SIOCSIFBRDADDR:
1173 case SIOCSIFNETMASK:
1174#if BYTE_ORDER != BIG_ENDIAN
1175 if (ifr->ifr_addr.sa_family == 0 &&
1176 ifr->ifr_addr.sa_len < 16) {
1177 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len;
1178 ifr->ifr_addr.sa_len = 16;
1179 }
1180#else
1181 if (ifr->ifr_addr.sa_len == 0)
1182 ifr->ifr_addr.sa_len = 16;
1183#endif
1184 break;
1185
1186 case OSIOCGIFADDR:
1187 cmd = SIOCGIFADDR;
1188 break;
1189
1190 case OSIOCGIFDSTADDR:
1191 cmd = SIOCGIFDSTADDR;
1192 break;
1193
1194 case OSIOCGIFBRDADDR:
1195 cmd = SIOCGIFBRDADDR;
1196 break;
1197
1198 case OSIOCGIFNETMASK:
1199 cmd = SIOCGIFNETMASK;
1200 }
dadab5e9
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1201 error = ((*so->so_proto->pr_usrreqs->pru_control)
1202 (so, cmd, data, ifp, td));
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1203 switch (ocmd) {
1204
1205 case OSIOCGIFADDR:
1206 case OSIOCGIFDSTADDR:
1207 case OSIOCGIFBRDADDR:
1208 case OSIOCGIFNETMASK:
1209 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family;
1210
1211 }
1212 }
1213#endif /* COMPAT_43 */
1214
1215 if ((oif_flags ^ ifp->if_flags) & IFF_UP) {
1216#ifdef INET6
1217 DELAY(100);/* XXX: temporary workaround for fxp issue*/
1218 if (ifp->if_flags & IFF_UP) {
1219 int s = splimp();
1220 in6_if_up(ifp);
1221 splx(s);
1222 }
1223#endif
1224 }
1225 return (error);
1226
1227 }
1228 return (0);
1229}
1230
1231/*
1232 * Set/clear promiscuous mode on interface ifp based on the truth value
1233 * of pswitch. The calls are reference counted so that only the first
1234 * "on" request actually has an effect, as does the final "off" request.
1235 * Results are undefined if the "off" and "on" requests are not matched.
1236 */
1237int
1238ifpromisc(ifp, pswitch)
1239 struct ifnet *ifp;
1240 int pswitch;
1241{
1242 struct ifreq ifr;
1243 int error;
1244 int oldflags;
1245
1246 oldflags = ifp->if_flags;
1247 if (ifp->if_ipending & IFF_PPROMISC) {
1248 /* Do nothing if device is in permanently promiscuous mode */
1249 ifp->if_pcount += pswitch ? 1 : -1;
1250 return (0);
1251 }
1252 if (pswitch) {
1253 /*
1254 * If the device is not configured up, we cannot put it in
1255 * promiscuous mode.
1256 */
1257 if ((ifp->if_flags & IFF_UP) == 0)
1258 return (ENETDOWN);
1259 if (ifp->if_pcount++ != 0)
1260 return (0);
1261 ifp->if_flags |= IFF_PROMISC;
1262 log(LOG_INFO, "%s%d: promiscuous mode enabled\n",
1263 ifp->if_name, ifp->if_unit);
1264 } else {
1265 if (--ifp->if_pcount > 0)
1266 return (0);
1267 ifp->if_flags &= ~IFF_PROMISC;
1268 log(LOG_INFO, "%s%d: promiscuous mode disabled\n",
1269 ifp->if_name, ifp->if_unit);
1270 }
1271 ifr.ifr_flags = ifp->if_flags;
1272 ifr.ifr_flagshigh = ifp->if_ipending >> 16;
1273 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
1274 if (error == 0)
1275 rt_ifmsg(ifp);
1276 else
1277 ifp->if_flags = oldflags;
1278 return error;
1279}
1280
1281/*
1282 * Return interface configuration
1283 * of system. List may be used
1284 * in later ioctl's (above) to get
1285 * other information.
1286 */
1287/*ARGSUSED*/
1288static int
41c20dac 1289ifconf(u_long cmd, caddr_t data)
984263bc 1290{
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1291 struct ifconf *ifc = (struct ifconf *)data;
1292 struct ifnet *ifp;
1293 struct ifaddr *ifa;
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1294 struct sockaddr *sa;
1295 struct ifreq ifr, *ifrp;
1296 int space = ifc->ifc_len, error = 0;
1297
1298 ifrp = ifc->ifc_req;
1299 TAILQ_FOREACH(ifp, &ifnet, if_link) {
1300 char workbuf[64];
1301 int ifnlen, addrs;
1302
1303 if (space <= sizeof (ifr))
1304 break;
1305 ifnlen = snprintf(workbuf, sizeof(workbuf),
1306 "%s%d", ifp->if_name, ifp->if_unit);
1307 if(ifnlen + 1 > sizeof ifr.ifr_name) {
1308 error = ENAMETOOLONG;
1309 break;
1310 } else {
1311 strcpy(ifr.ifr_name, workbuf);
1312 }
1313
1314 addrs = 0;
1315 ifa = ifp->if_addrhead.tqh_first;
1316 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1317 if (space <= sizeof(ifr))
1318 break;
1319 sa = ifa->ifa_addr;
dadab5e9 1320 if (curproc->p_ucred->cr_prison && prison_if(curthread, sa))
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1321 continue;
1322 addrs++;
1323#ifdef COMPAT_43
1324 if (cmd == OSIOCGIFCONF) {
1325 struct osockaddr *osa =
1326 (struct osockaddr *)&ifr.ifr_addr;
1327 ifr.ifr_addr = *sa;
1328 osa->sa_family = sa->sa_family;
1329 error = copyout((caddr_t)&ifr, (caddr_t)ifrp,
1330 sizeof (ifr));
1331 ifrp++;
1332 } else
1333#endif
1334 if (sa->sa_len <= sizeof(*sa)) {
1335 ifr.ifr_addr = *sa;
1336 error = copyout((caddr_t)&ifr, (caddr_t)ifrp,
1337 sizeof (ifr));
1338 ifrp++;
1339 } else {
1340 if (space < sizeof (ifr) + sa->sa_len -
1341 sizeof(*sa))
1342 break;
1343 space -= sa->sa_len - sizeof(*sa);
1344 error = copyout((caddr_t)&ifr, (caddr_t)ifrp,
1345 sizeof (ifr.ifr_name));
1346 if (error == 0)
1347 error = copyout((caddr_t)sa,
1348 (caddr_t)&ifrp->ifr_addr, sa->sa_len);
1349 ifrp = (struct ifreq *)
1350 (sa->sa_len + (caddr_t)&ifrp->ifr_addr);
1351 }
1352 if (error)
1353 break;
1354 space -= sizeof (ifr);
1355 }
1356 if (error)
1357 break;
1358 if (!addrs) {
1359 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
1360 error = copyout((caddr_t)&ifr, (caddr_t)ifrp,
1361 sizeof (ifr));
1362 if (error)
1363 break;
1364 space -= sizeof (ifr);
1365 ifrp++;
1366 }
1367 }
1368 ifc->ifc_len -= space;
1369 return (error);
1370}
1371
1372/*
1373 * Just like if_promisc(), but for all-multicast-reception mode.
1374 */
1375int
1376if_allmulti(ifp, onswitch)
1377 struct ifnet *ifp;
1378 int onswitch;
1379{
1380 int error = 0;
1381 int s = splimp();
1382 struct ifreq ifr;
1383
1384 if (onswitch) {
1385 if (ifp->if_amcount++ == 0) {
1386 ifp->if_flags |= IFF_ALLMULTI;
1387 ifr.ifr_flags = ifp->if_flags;
1388 ifr.ifr_flagshigh = ifp->if_ipending >> 16;
1389 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
1390 }
1391 } else {
1392 if (ifp->if_amcount > 1) {
1393 ifp->if_amcount--;
1394 } else {
1395 ifp->if_amcount = 0;
1396 ifp->if_flags &= ~IFF_ALLMULTI;
1397 ifr.ifr_flags = ifp->if_flags;
1398 ifr.ifr_flagshigh = ifp->if_ipending >> 16;
1399 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
1400 }
1401 }
1402 splx(s);
1403
1404 if (error == 0)
1405 rt_ifmsg(ifp);
1406 return error;
1407}
1408
1409/*
1410 * Add a multicast listenership to the interface in question.
1411 * The link layer provides a routine which converts
1412 */
1413int
1414if_addmulti(ifp, sa, retifma)
1415 struct ifnet *ifp; /* interface to manipulate */
1416 struct sockaddr *sa; /* address to add */
1417 struct ifmultiaddr **retifma;
1418{
1419 struct sockaddr *llsa, *dupsa;
1420 int error, s;
1421 struct ifmultiaddr *ifma;
1422
1423 /*
1424 * If the matching multicast address already exists
1425 * then don't add a new one, just add a reference
1426 */
1427 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
1428 if (equal(sa, ifma->ifma_addr)) {
1429 ifma->ifma_refcount++;
1430 if (retifma)
1431 *retifma = ifma;
1432 return 0;
1433 }
1434 }
1435
1436 /*
1437 * Give the link layer a chance to accept/reject it, and also
1438 * find out which AF_LINK address this maps to, if it isn't one
1439 * already.
1440 */
1441 if (ifp->if_resolvemulti) {
1442 error = ifp->if_resolvemulti(ifp, &llsa, sa);
1443 if (error) return error;
1444 } else {
1445 llsa = 0;
1446 }
1447
1448 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, M_IFMADDR, M_WAITOK);
1449 MALLOC(dupsa, struct sockaddr *, sa->sa_len, M_IFMADDR, M_WAITOK);
1450 bcopy(sa, dupsa, sa->sa_len);
1451
1452 ifma->ifma_addr = dupsa;
1453 ifma->ifma_lladdr = llsa;
1454 ifma->ifma_ifp = ifp;
1455 ifma->ifma_refcount = 1;
1456 ifma->ifma_protospec = 0;
1457 rt_newmaddrmsg(RTM_NEWMADDR, ifma);
1458
1459 /*
1460 * Some network interfaces can scan the address list at
1461 * interrupt time; lock them out.
1462 */
1463 s = splimp();
1464 LIST_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link);
1465 splx(s);
1466 *retifma = ifma;
1467
1468 if (llsa != 0) {
1469 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
1470 if (equal(ifma->ifma_addr, llsa))
1471 break;
1472 }
1473 if (ifma) {
1474 ifma->ifma_refcount++;
1475 } else {
1476 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma,
1477 M_IFMADDR, M_WAITOK);
1478 MALLOC(dupsa, struct sockaddr *, llsa->sa_len,
1479 M_IFMADDR, M_WAITOK);
1480 bcopy(llsa, dupsa, llsa->sa_len);
1481 ifma->ifma_addr = dupsa;
1482 ifma->ifma_ifp = ifp;
1483 ifma->ifma_refcount = 1;
1484 s = splimp();
1485 LIST_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link);
1486 splx(s);
1487 }
1488 }
1489 /*
1490 * We are certain we have added something, so call down to the
1491 * interface to let them know about it.
1492 */
1493 s = splimp();
1494 ifp->if_ioctl(ifp, SIOCADDMULTI, 0);
1495 splx(s);
1496
1497 return 0;
1498}
1499
1500/*
1501 * Remove a reference to a multicast address on this interface. Yell
1502 * if the request does not match an existing membership.
1503 */
1504int
1505if_delmulti(ifp, sa)
1506 struct ifnet *ifp;
1507 struct sockaddr *sa;
1508{
1509 struct ifmultiaddr *ifma;
1510 int s;
1511
1512 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link)
1513 if (equal(sa, ifma->ifma_addr))
1514 break;
1515 if (ifma == 0)
1516 return ENOENT;
1517
1518 if (ifma->ifma_refcount > 1) {
1519 ifma->ifma_refcount--;
1520 return 0;
1521 }
1522
1523 rt_newmaddrmsg(RTM_DELMADDR, ifma);
1524 sa = ifma->ifma_lladdr;
1525 s = splimp();
1526 LIST_REMOVE(ifma, ifma_link);
1527 /*
1528 * Make sure the interface driver is notified
1529 * in the case of a link layer mcast group being left.
1530 */
1531 if (ifma->ifma_addr->sa_family == AF_LINK && sa == 0)
1532 ifp->if_ioctl(ifp, SIOCDELMULTI, 0);
1533 splx(s);
1534 free(ifma->ifma_addr, M_IFMADDR);
1535 free(ifma, M_IFMADDR);
1536 if (sa == 0)
1537 return 0;
1538
1539 /*
1540 * Now look for the link-layer address which corresponds to
1541 * this network address. It had been squirreled away in
1542 * ifma->ifma_lladdr for this purpose (so we don't have
1543 * to call ifp->if_resolvemulti() again), and we saved that
1544 * value in sa above. If some nasty deleted the
1545 * link-layer address out from underneath us, we can deal because
1546 * the address we stored was is not the same as the one which was
1547 * in the record for the link-layer address. (So we don't complain
1548 * in that case.)
1549 */
1550 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link)
1551 if (equal(sa, ifma->ifma_addr))
1552 break;
1553 if (ifma == 0)
1554 return 0;
1555
1556 if (ifma->ifma_refcount > 1) {
1557 ifma->ifma_refcount--;
1558 return 0;
1559 }
1560
1561 s = splimp();
1562 LIST_REMOVE(ifma, ifma_link);
1563 ifp->if_ioctl(ifp, SIOCDELMULTI, 0);
1564 splx(s);
1565 free(ifma->ifma_addr, M_IFMADDR);
1566 free(sa, M_IFMADDR);
1567 free(ifma, M_IFMADDR);
1568
1569 return 0;
1570}
1571
1572/*
1573 * Set the link layer address on an interface.
1574 *
1575 * At this time we only support certain types of interfaces,
1576 * and we don't allow the length of the address to change.
1577 */
1578int
1579if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len)
1580{
1581 struct sockaddr_dl *sdl;
1582 struct ifaddr *ifa;
1583 struct ifreq ifr;
1584
1585 ifa = ifnet_addrs[ifp->if_index - 1];
1586 if (ifa == NULL)
1587 return (EINVAL);
1588 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
1589 if (sdl == NULL)
1590 return (EINVAL);
1591 if (len != sdl->sdl_alen) /* don't allow length to change */
1592 return (EINVAL);
1593 switch (ifp->if_type) {
1594 case IFT_ETHER: /* these types use struct arpcom */
1595 case IFT_FDDI:
1596 case IFT_XETHER:
1597 case IFT_ISO88025:
1598 case IFT_L2VLAN:
1599 bcopy(lladdr, ((struct arpcom *)ifp->if_softc)->ac_enaddr, len);
1600 /* FALLTHROUGH */
1601 case IFT_ARCNET:
1602 bcopy(lladdr, LLADDR(sdl), len);
1603 break;
1604 default:
1605 return (ENODEV);
1606 }
1607 /*
1608 * If the interface is already up, we need
1609 * to re-init it in order to reprogram its
1610 * address filter.
1611 */
1612 if ((ifp->if_flags & IFF_UP) != 0) {
1613 ifp->if_flags &= ~IFF_UP;
1614 ifr.ifr_flags = ifp->if_flags;
1615 ifr.ifr_flagshigh = ifp->if_ipending >> 16;
1616 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
1617 ifp->if_flags |= IFF_UP;
1618 ifr.ifr_flags = ifp->if_flags;
1619 ifr.ifr_flagshigh = ifp->if_ipending >> 16;
1620 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
1621#ifdef INET
1622 /*
1623 * Also send gratuitous ARPs to notify other nodes about
1624 * the address change.
1625 */
1626 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1627 if (ifa->ifa_addr != NULL &&
1628 ifa->ifa_addr->sa_family == AF_INET)
1629 arp_ifinit(ifp, ifa);
1630 }
1631#endif
1632 }
1633 return (0);
1634}
1635
1636struct ifmultiaddr *
1637ifmaof_ifpforaddr(sa, ifp)
1638 struct sockaddr *sa;
1639 struct ifnet *ifp;
1640{
1641 struct ifmultiaddr *ifma;
1642
1643 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link)
1644 if (equal(ifma->ifma_addr, sa))
1645 break;
1646
1647 return ifma;
1648}
1649
1650int
1651if_printf(struct ifnet *ifp, const char *fmt, ...)
1652{
1653 va_list ap;
1654 int retval;
1655
1656 retval = printf("%s%d: ", ifp->if_name, ifp->if_unit);
1657 va_start(ap, fmt);
1658 retval += vprintf(fmt, ap);
1659 va_end(ap);
1660 return (retval);
1661}
1662
1663SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers");
1664SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management");