2 * Copyright (c) 1980, 1986, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * @(#)if.c 8.5 (Berkeley) 1/9/95
33 #include "opt_compat.h"
34 #include "opt_inet6.h"
37 #include <sys/param.h>
38 #include <sys/types.h>
40 #include <sys/malloc.h>
44 #include <sys/systm.h>
47 #include <sys/socket.h>
48 #include <sys/socketvar.h>
49 #include <sys/protosw.h>
50 #include <sys/kernel.h>
52 #include <sys/refcount.h>
53 #include <sys/module.h>
54 #include <sys/rwlock.h>
55 #include <sys/sockio.h>
56 #include <sys/syslog.h>
57 #include <sys/sysctl.h>
58 #include <sys/taskqueue.h>
59 #include <sys/domain.h>
63 #include <machine/stdarg.h>
67 #include <net/if_arp.h>
68 #include <net/if_clone.h>
69 #include <net/if_dl.h>
70 #include <net/if_types.h>
71 #include <net/if_var.h>
72 #include <net/radix.h>
73 #include <net/route.h>
76 #if defined(INET) || defined(INET6)
77 #include <net/ethernet.h>
78 #include <netinet/in.h>
79 #include <netinet/in_var.h>
80 #include <netinet/ip.h>
81 #include <netinet/ip_carp.h>
83 #include <netinet/if_ether.h>
86 #include <netinet6/in6_var.h>
87 #include <netinet6/in6_ifattach.h>
89 #endif /* INET || INET6 */
91 #include <security/mac/mac_framework.h>
93 #ifdef COMPAT_FREEBSD32
94 #include <sys/mount.h>
95 #include <compat/freebsd32/freebsd32.h>
98 struct ifindex_entry {
99 struct ifnet *ife_ifnet;
102 SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers");
103 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management");
105 TUNABLE_INT("net.link.ifqmaxlen", &ifqmaxlen);
106 SYSCTL_INT(_net_link, OID_AUTO, ifqmaxlen, CTLFLAG_RDTUN,
107 &ifqmaxlen, 0, "max send queue size");
109 /* Log link state change events */
110 static int log_link_state_change = 1;
112 SYSCTL_INT(_net_link, OID_AUTO, log_link_state_change, CTLFLAG_RW,
113 &log_link_state_change, 0,
114 "log interface link state change events");
116 /* Interface description */
117 static unsigned int ifdescr_maxlen = 1024;
118 SYSCTL_UINT(_net, OID_AUTO, ifdescr_maxlen, CTLFLAG_RW,
120 "administrative maximum length for interface description");
122 static MALLOC_DEFINE(M_IFDESCR, "ifdescr", "ifnet descriptions");
124 /* global sx for non-critical path ifdescr */
125 static struct sx ifdescr_sx;
126 SX_SYSINIT(ifdescr_sx, &ifdescr_sx, "ifnet descr");
128 void (*bridge_linkstate_p)(struct ifnet *ifp);
129 void (*ng_ether_link_state_p)(struct ifnet *ifp, int state);
130 void (*lagg_linkstate_p)(struct ifnet *ifp, int state);
131 /* These are external hooks for CARP. */
132 void (*carp_linkstate_p)(struct ifnet *ifp);
133 void (*carp_demote_adj_p)(int, char *);
134 int (*carp_master_p)(struct ifaddr *);
135 #if defined(INET) || defined(INET6)
136 int (*carp_forus_p)(struct ifnet *ifp, u_char *dhost);
137 int (*carp_output_p)(struct ifnet *ifp, struct mbuf *m,
138 const struct sockaddr *sa);
139 int (*carp_ioctl_p)(struct ifreq *, u_long, struct thread *);
140 int (*carp_attach_p)(struct ifaddr *, int);
141 void (*carp_detach_p)(struct ifaddr *);
144 int (*carp_iamatch_p)(struct ifaddr *, uint8_t **);
147 struct ifaddr *(*carp_iamatch6_p)(struct ifnet *ifp, struct in6_addr *taddr6);
148 caddr_t (*carp_macmatch6_p)(struct ifnet *ifp, struct mbuf *m,
149 const struct in6_addr *taddr);
152 struct mbuf *(*tbr_dequeue_ptr)(struct ifaltq *, int) = NULL;
155 * XXX: Style; these should be sorted alphabetically, and unprototyped
156 * static functions should be prototyped. Currently they are sorted by
159 static void if_attachdomain(void *);
160 static void if_attachdomain1(struct ifnet *);
161 static int ifconf(u_long, caddr_t);
162 static void if_freemulti(struct ifmultiaddr *);
163 static void if_init(void *);
164 static void if_grow(void);
165 static void if_route(struct ifnet *, int flag, int fam);
166 static int if_setflag(struct ifnet *, int, int, int *, int);
167 static int if_transmit(struct ifnet *ifp, struct mbuf *m);
168 static void if_unroute(struct ifnet *, int flag, int fam);
169 static void link_rtrequest(int, struct rtentry *, struct rt_addrinfo *);
170 static int if_rtdel(struct radix_node *, void *);
171 static int ifhwioctl(u_long, struct ifnet *, caddr_t, struct thread *);
172 static int if_delmulti_locked(struct ifnet *, struct ifmultiaddr *, int);
173 static void do_link_state_change(void *, int);
174 static int if_getgroup(struct ifgroupreq *, struct ifnet *);
175 static int if_getgroupmembers(struct ifgroupreq *);
176 static void if_delgroups(struct ifnet *);
177 static void if_attach_internal(struct ifnet *, int);
178 static void if_detach_internal(struct ifnet *, int);
182 * XXX: declare here to avoid to include many inet6 related files..
183 * should be more generalized?
185 extern void nd6_setmtu(struct ifnet *);
188 VNET_DEFINE(int, if_index);
189 int ifqmaxlen = IFQ_MAXLEN;
190 VNET_DEFINE(struct ifnethead, ifnet); /* depend on static init XXX */
191 VNET_DEFINE(struct ifgrouphead, ifg_head);
193 static VNET_DEFINE(int, if_indexlim) = 8;
195 /* Table of ifnet by index. */
196 VNET_DEFINE(struct ifindex_entry *, ifindex_table);
198 #define V_if_indexlim VNET(if_indexlim)
199 #define V_ifindex_table VNET(ifindex_table)
202 * The global network interface list (V_ifnet) and related state (such as
203 * if_index, if_indexlim, and ifindex_table) are protected by an sxlock and
204 * an rwlock. Either may be acquired shared to stablize the list, but both
205 * must be acquired writable to modify the list. This model allows us to
206 * both stablize the interface list during interrupt thread processing, but
207 * also to stablize it over long-running ioctls, without introducing priority
208 * inversions and deadlocks.
210 struct rwlock ifnet_rwlock;
211 struct sx ifnet_sxlock;
214 * The allocation of network interfaces is a rather non-atomic affair; we
215 * need to select an index before we are ready to expose the interface for
216 * use, so will use this pointer value to indicate reservation.
218 #define IFNET_HOLD (void *)(uintptr_t)(-1)
220 static if_com_alloc_t *if_com_alloc[256];
221 static if_com_free_t *if_com_free[256];
223 static MALLOC_DEFINE(M_IFNET, "ifnet", "interface internals");
224 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address");
225 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address");
228 ifnet_byindex_locked(u_short idx)
231 if (idx > V_if_index)
233 if (V_ifindex_table[idx].ife_ifnet == IFNET_HOLD)
235 return (V_ifindex_table[idx].ife_ifnet);
239 ifnet_byindex(u_short idx)
243 IFNET_RLOCK_NOSLEEP();
244 ifp = ifnet_byindex_locked(idx);
245 IFNET_RUNLOCK_NOSLEEP();
250 ifnet_byindex_ref(u_short idx)
254 IFNET_RLOCK_NOSLEEP();
255 ifp = ifnet_byindex_locked(idx);
256 if (ifp == NULL || (ifp->if_flags & IFF_DYING)) {
257 IFNET_RUNLOCK_NOSLEEP();
261 IFNET_RUNLOCK_NOSLEEP();
266 * Allocate an ifindex array entry; return 0 on success or an error on
270 ifindex_alloc_locked(u_short *idxp)
274 IFNET_WLOCK_ASSERT();
278 * Try to find an empty slot below V_if_index. If we fail, take the
281 for (idx = 1; idx <= V_if_index; idx++) {
282 if (V_ifindex_table[idx].ife_ifnet == NULL)
286 /* Catch if_index overflow. */
289 if (idx >= V_if_indexlim) {
293 if (idx > V_if_index)
300 ifindex_free_locked(u_short idx)
303 IFNET_WLOCK_ASSERT();
305 V_ifindex_table[idx].ife_ifnet = NULL;
306 while (V_if_index > 0 &&
307 V_ifindex_table[V_if_index].ife_ifnet == NULL)
312 ifindex_free(u_short idx)
316 ifindex_free_locked(idx);
321 ifnet_setbyindex_locked(u_short idx, struct ifnet *ifp)
324 IFNET_WLOCK_ASSERT();
326 V_ifindex_table[idx].ife_ifnet = ifp;
330 ifnet_setbyindex(u_short idx, struct ifnet *ifp)
334 ifnet_setbyindex_locked(idx, ifp);
339 ifaddr_byindex(u_short idx)
343 IFNET_RLOCK_NOSLEEP();
344 ifa = ifnet_byindex_locked(idx)->if_addr;
347 IFNET_RUNLOCK_NOSLEEP();
352 * Network interface utility routines.
354 * Routines with ifa_ifwith* names take sockaddr *'s as
359 vnet_if_init(const void *unused __unused)
362 TAILQ_INIT(&V_ifnet);
363 TAILQ_INIT(&V_ifg_head);
365 if_grow(); /* create initial table */
367 vnet_if_clone_init();
369 VNET_SYSINIT(vnet_if_init, SI_SUB_INIT_IF, SI_ORDER_SECOND, vnet_if_init,
374 if_init(void *dummy __unused)
380 SYSINIT(interfaces, SI_SUB_INIT_IF, SI_ORDER_FIRST, if_init, NULL);
385 vnet_if_uninit(const void *unused __unused)
388 VNET_ASSERT(TAILQ_EMPTY(&V_ifnet), ("%s:%d tailq &V_ifnet=%p "
389 "not empty", __func__, __LINE__, &V_ifnet));
390 VNET_ASSERT(TAILQ_EMPTY(&V_ifg_head), ("%s:%d tailq &V_ifg_head=%p "
391 "not empty", __func__, __LINE__, &V_ifg_head));
393 free((caddr_t)V_ifindex_table, M_IFNET);
395 VNET_SYSUNINIT(vnet_if_uninit, SI_SUB_INIT_IF, SI_ORDER_FIRST,
396 vnet_if_uninit, NULL);
404 struct ifindex_entry *e;
406 IFNET_WLOCK_ASSERT();
407 oldlim = V_if_indexlim;
409 n = (oldlim << 1) * sizeof(*e);
410 e = malloc(n, M_IFNET, M_WAITOK | M_ZERO);
412 if (V_if_indexlim != oldlim) {
416 if (V_ifindex_table != NULL) {
417 memcpy((caddr_t)e, (caddr_t)V_ifindex_table, n/2);
418 free((caddr_t)V_ifindex_table, M_IFNET);
425 * Allocate a struct ifnet and an index for an interface. A layer 2
426 * common structure will also be allocated if an allocation routine is
427 * registered for the passed type.
430 if_alloc(u_char type)
435 ifp = malloc(sizeof(struct ifnet), M_IFNET, M_WAITOK|M_ZERO);
437 if (ifindex_alloc_locked(&idx) != 0) {
442 ifnet_setbyindex_locked(idx, IFNET_HOLD);
446 ifp->if_alloctype = type;
447 if (if_com_alloc[type] != NULL) {
448 ifp->if_l2com = if_com_alloc[type](type, ifp);
449 if (ifp->if_l2com == NULL) {
456 IF_ADDR_LOCK_INIT(ifp);
457 TASK_INIT(&ifp->if_linktask, 0, do_link_state_change, ifp);
458 ifp->if_afdata_initialized = 0;
459 IF_AFDATA_LOCK_INIT(ifp);
460 TAILQ_INIT(&ifp->if_addrhead);
461 TAILQ_INIT(&ifp->if_multiaddrs);
462 TAILQ_INIT(&ifp->if_groups);
466 ifq_init(&ifp->if_snd, ifp);
468 refcount_init(&ifp->if_refcount, 1); /* Index reference. */
469 ifnet_setbyindex(ifp->if_index, ifp);
474 * Do the actual work of freeing a struct ifnet, and layer 2 common
475 * structure. This call is made when the last reference to an
476 * interface is released.
479 if_free_internal(struct ifnet *ifp)
482 KASSERT((ifp->if_flags & IFF_DYING),
483 ("if_free_internal: interface not dying"));
485 if (if_com_free[ifp->if_alloctype] != NULL)
486 if_com_free[ifp->if_alloctype](ifp->if_l2com,
490 mac_ifnet_destroy(ifp);
492 if (ifp->if_description != NULL)
493 free(ifp->if_description, M_IFDESCR);
494 IF_AFDATA_DESTROY(ifp);
495 IF_ADDR_LOCK_DESTROY(ifp);
496 ifq_delete(&ifp->if_snd);
501 * Deregister an interface and free the associated storage.
504 if_free(struct ifnet *ifp)
507 ifp->if_flags |= IFF_DYING; /* XXX: Locking */
509 CURVNET_SET_QUIET(ifp->if_vnet);
511 KASSERT(ifp == ifnet_byindex_locked(ifp->if_index),
512 ("%s: freeing unallocated ifnet", ifp->if_xname));
514 ifindex_free_locked(ifp->if_index);
517 if (refcount_release(&ifp->if_refcount))
518 if_free_internal(ifp);
523 * Interfaces to keep an ifnet type-stable despite the possibility of the
524 * driver calling if_free(). If there are additional references, we defer
525 * freeing the underlying data structure.
528 if_ref(struct ifnet *ifp)
531 /* We don't assert the ifnet list lock here, but arguably should. */
532 refcount_acquire(&ifp->if_refcount);
536 if_rele(struct ifnet *ifp)
539 if (!refcount_release(&ifp->if_refcount))
541 if_free_internal(ifp);
545 ifq_init(struct ifaltq *ifq, struct ifnet *ifp)
548 mtx_init(&ifq->ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF);
550 if (ifq->ifq_maxlen == 0)
551 ifq->ifq_maxlen = ifqmaxlen;
554 ifq->altq_disc = NULL;
555 ifq->altq_flags &= ALTQF_CANTCHANGE;
556 ifq->altq_tbr = NULL;
561 ifq_delete(struct ifaltq *ifq)
563 mtx_destroy(&ifq->ifq_mtx);
567 * Perform generic interface initalization tasks and attach the interface
568 * to the list of "active" interfaces. If vmove flag is set on entry
569 * to if_attach_internal(), perform only a limited subset of initialization
570 * tasks, given that we are moving from one vnet to another an ifnet which
571 * has already been fully initialized.
574 * - The decision to return void and thus require this function to
575 * succeed is questionable.
576 * - We should probably do more sanity checking. For instance we don't
577 * do anything to insure if_xname is unique or non-empty.
580 if_attach(struct ifnet *ifp)
583 if_attach_internal(ifp, 0);
587 * Compute the least common TSO limit.
590 if_hw_tsomax_common(struct ifnet *ifp, struct ifnet_hw_tsomax *pmax)
593 * 1) If there is no limit currently, take the limit from
594 * the network adapter.
596 * 2) If the network adapter has a limit below the current
599 if (pmax->tsomaxbytes == 0 || (ifp->if_hw_tsomax != 0 &&
600 ifp->if_hw_tsomax < pmax->tsomaxbytes)) {
601 pmax->tsomaxbytes = ifp->if_hw_tsomax;
603 if (pmax->tsomaxsegcount == 0 || (ifp->if_hw_tsomaxsegcount != 0 &&
604 ifp->if_hw_tsomaxsegcount < pmax->tsomaxsegcount)) {
605 pmax->tsomaxsegcount = ifp->if_hw_tsomaxsegcount;
607 if (pmax->tsomaxsegsize == 0 || (ifp->if_hw_tsomaxsegsize != 0 &&
608 ifp->if_hw_tsomaxsegsize < pmax->tsomaxsegsize)) {
609 pmax->tsomaxsegsize = ifp->if_hw_tsomaxsegsize;
614 * Update TSO limit of a network adapter.
616 * Returns zero if no change. Else non-zero.
619 if_hw_tsomax_update(struct ifnet *ifp, struct ifnet_hw_tsomax *pmax)
622 if (ifp->if_hw_tsomax != pmax->tsomaxbytes) {
623 ifp->if_hw_tsomax = pmax->tsomaxbytes;
626 if (ifp->if_hw_tsomaxsegsize != pmax->tsomaxsegsize) {
627 ifp->if_hw_tsomaxsegsize = pmax->tsomaxsegsize;
630 if (ifp->if_hw_tsomaxsegcount != pmax->tsomaxsegcount) {
631 ifp->if_hw_tsomaxsegcount = pmax->tsomaxsegcount;
638 if_attach_internal(struct ifnet *ifp, int vmove)
640 unsigned socksize, ifasize;
641 int namelen, masklen;
642 struct sockaddr_dl *sdl;
645 if (ifp->if_index == 0 || ifp != ifnet_byindex(ifp->if_index))
646 panic ("%s: BUG: if_attach called without if_alloc'd input()\n",
650 ifp->if_vnet = curvnet;
651 if (ifp->if_home_vnet == NULL)
652 ifp->if_home_vnet = curvnet;
655 if_addgroup(ifp, IFG_ALL);
657 getmicrotime(&ifp->if_lastchange);
658 ifp->if_data.ifi_epoch = time_uptime;
659 ifp->if_data.ifi_datalen = sizeof(struct if_data);
661 KASSERT((ifp->if_transmit == NULL && ifp->if_qflush == NULL) ||
662 (ifp->if_transmit != NULL && ifp->if_qflush != NULL),
663 ("transmit and qflush must both either be set or both be NULL"));
664 if (ifp->if_transmit == NULL) {
665 ifp->if_transmit = if_transmit;
666 ifp->if_qflush = if_qflush;
671 mac_ifnet_create(ifp);
675 * Create a Link Level name for this device.
677 namelen = strlen(ifp->if_xname);
679 * Always save enough space for any possiable name so we
680 * can do a rename in place later.
682 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ;
683 socksize = masklen + ifp->if_addrlen;
684 if (socksize < sizeof(*sdl))
685 socksize = sizeof(*sdl);
686 socksize = roundup2(socksize, sizeof(long));
687 ifasize = sizeof(*ifa) + 2 * socksize;
688 ifa = malloc(ifasize, M_IFADDR, M_WAITOK | M_ZERO);
690 sdl = (struct sockaddr_dl *)(ifa + 1);
691 sdl->sdl_len = socksize;
692 sdl->sdl_family = AF_LINK;
693 bcopy(ifp->if_xname, sdl->sdl_data, namelen);
694 sdl->sdl_nlen = namelen;
695 sdl->sdl_index = ifp->if_index;
696 sdl->sdl_type = ifp->if_type;
699 ifa->ifa_rtrequest = link_rtrequest;
700 ifa->ifa_addr = (struct sockaddr *)sdl;
701 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl);
702 ifa->ifa_netmask = (struct sockaddr *)sdl;
703 sdl->sdl_len = masklen;
705 sdl->sdl_data[--namelen] = 0xff;
706 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link);
707 /* Reliably crash if used uninitialized. */
708 ifp->if_broadcastaddr = NULL;
710 #if defined(INET) || defined(INET6)
711 /* Use defaults for TSO, if nothing is set */
712 if (ifp->if_hw_tsomax == 0 &&
713 ifp->if_hw_tsomaxsegcount == 0 &&
714 ifp->if_hw_tsomaxsegsize == 0) {
716 * The TSO defaults needs to be such that an
717 * NFS mbuf list of 35 mbufs totalling just
718 * below 64K works and that a chain of mbufs
719 * can be defragged into at most 32 segments:
721 ifp->if_hw_tsomax = min(IP_MAXPACKET, (32 * MCLBYTES) -
722 (ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN));
723 ifp->if_hw_tsomaxsegcount = 35;
724 ifp->if_hw_tsomaxsegsize = 2048; /* 2K */
726 /* XXX some drivers set IFCAP_TSO after ethernet attach */
727 if (ifp->if_capabilities & IFCAP_TSO) {
728 if_printf(ifp, "Using defaults for TSO: %u/%u/%u\n",
730 ifp->if_hw_tsomaxsegcount,
731 ifp->if_hw_tsomaxsegsize);
739 * Update the interface index in the link layer address
742 for (ifa = ifp->if_addr; ifa != NULL;
743 ifa = TAILQ_NEXT(ifa, ifa_link)) {
744 if (ifa->ifa_addr->sa_family == AF_LINK) {
745 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
746 sdl->sdl_index = ifp->if_index;
753 TAILQ_INSERT_TAIL(&V_ifnet, ifp, if_link);
755 curvnet->vnet_ifcnt++;
759 if (domain_init_status >= 2)
760 if_attachdomain1(ifp);
762 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp);
763 if (IS_DEFAULT_VNET(curvnet))
764 devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL);
766 /* Announce the interface. */
767 rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
771 if_attachdomain(void *dummy)
775 TAILQ_FOREACH(ifp, &V_ifnet, if_link)
776 if_attachdomain1(ifp);
778 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND,
779 if_attachdomain, NULL);
782 if_attachdomain1(struct ifnet *ifp)
787 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we
788 * cannot lock ifp->if_afdata initialization, entirely.
790 if (IF_AFDATA_TRYLOCK(ifp) == 0)
792 if (ifp->if_afdata_initialized >= domain_init_status) {
793 IF_AFDATA_UNLOCK(ifp);
794 log(LOG_WARNING, "%s called more than once on %s\n",
795 __func__, ifp->if_xname);
798 ifp->if_afdata_initialized = domain_init_status;
799 IF_AFDATA_UNLOCK(ifp);
801 /* address family dependent data region */
802 bzero(ifp->if_afdata, sizeof(ifp->if_afdata));
803 for (dp = domains; dp; dp = dp->dom_next) {
804 if (dp->dom_ifattach)
805 ifp->if_afdata[dp->dom_family] =
806 (*dp->dom_ifattach)(ifp);
811 * Remove any unicast or broadcast network addresses from an interface.
814 if_purgeaddrs(struct ifnet *ifp)
816 struct ifaddr *ifa, *next;
818 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) {
819 if (ifa->ifa_addr->sa_family == AF_LINK)
822 /* XXX: Ugly!! ad hoc just for INET */
823 if (ifa->ifa_addr->sa_family == AF_INET) {
824 struct ifaliasreq ifr;
826 bzero(&ifr, sizeof(ifr));
827 ifr.ifra_addr = *ifa->ifa_addr;
828 if (ifa->ifa_dstaddr)
829 ifr.ifra_broadaddr = *ifa->ifa_dstaddr;
830 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp,
836 if (ifa->ifa_addr->sa_family == AF_INET6) {
838 /* ifp_addrhead is already updated */
842 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link);
848 * Remove any multicast network addresses from an interface when an ifnet
852 if_purgemaddrs(struct ifnet *ifp)
854 struct ifmultiaddr *ifma;
855 struct ifmultiaddr *next;
858 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next)
859 if_delmulti_locked(ifp, ifma, 1);
860 IF_ADDR_WUNLOCK(ifp);
864 * Detach an interface, removing it from the list of "active" interfaces.
865 * If vmove flag is set on entry to if_detach_internal(), perform only a
866 * limited subset of cleanup tasks, given that we are moving an ifnet from
867 * one vnet to another, where it must be fully operational.
869 * XXXRW: There are some significant questions about event ordering, and
870 * how to prevent things from starting to use the interface during detach.
873 if_detach(struct ifnet *ifp)
876 CURVNET_SET_QUIET(ifp->if_vnet);
877 if_detach_internal(ifp, 0);
882 if_detach_internal(struct ifnet *ifp, int vmove)
885 struct radix_node_head *rnh;
892 TAILQ_FOREACH(iter, &V_ifnet, if_link)
894 TAILQ_REMOVE(&V_ifnet, ifp, if_link);
900 curvnet->vnet_ifcnt--;
905 panic("%s: ifp=%p not on the ifnet tailq %p",
906 __func__, ifp, &V_ifnet);
908 return; /* XXX this should panic as well? */
912 * Remove/wait for pending events.
914 taskqueue_drain(taskqueue_swi, &ifp->if_linktask);
917 * Remove routes and flush queues.
921 if (ALTQ_IS_ENABLED(&ifp->if_snd))
922 altq_disable(&ifp->if_snd);
923 if (ALTQ_IS_ATTACHED(&ifp->if_snd))
924 altq_detach(&ifp->if_snd);
935 * Remove all IPv6 kernel structs related to ifp. This should be done
936 * before removing routing entries below, since IPv6 interface direct
937 * routes are expected to be removed by the IPv6-specific kernel API.
938 * Otherwise, the kernel will detect some inconsistency and bark it.
946 * Prevent further calls into the device driver via ifnet.
951 * Remove link ifaddr pointer and maybe decrement if_index.
952 * Clean up all addresses.
956 /* We can now free link ifaddr. */
957 if (!TAILQ_EMPTY(&ifp->if_addrhead)) {
958 ifa = TAILQ_FIRST(&ifp->if_addrhead);
959 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link);
965 * Delete all remaining routes using this interface
966 * Unfortuneatly the only way to do this is to slog through
967 * the entire routing table looking for routes which point
968 * to this interface...oh well...
970 for (i = 1; i <= AF_MAX; i++) {
971 for (j = 0; j < rt_numfibs; j++) {
972 rnh = rt_tables_get_rnh(j, i);
975 RADIX_NODE_HEAD_LOCK(rnh);
976 (void) rnh->rnh_walktree(rnh, if_rtdel, ifp);
977 RADIX_NODE_HEAD_UNLOCK(rnh);
981 /* Announce that the interface is gone. */
982 rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
983 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp);
984 if (IS_DEFAULT_VNET(curvnet))
985 devctl_notify("IFNET", ifp->if_xname, "DETACH", NULL);
989 * We cannot hold the lock over dom_ifdetach calls as they might
990 * sleep, for example trying to drain a callout, thus open up the
991 * theoretical race with re-attaching.
994 i = ifp->if_afdata_initialized;
995 ifp->if_afdata_initialized = 0;
996 IF_AFDATA_UNLOCK(ifp);
997 for (dp = domains; i > 0 && dp; dp = dp->dom_next) {
998 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family])
999 (*dp->dom_ifdetach)(ifp,
1000 ifp->if_afdata[dp->dom_family]);
1006 * if_vmove() performs a limited version of if_detach() in current
1007 * vnet and if_attach()es the ifnet to the vnet specified as 2nd arg.
1008 * An attempt is made to shrink if_index in current vnet, find an
1009 * unused if_index in target vnet and calls if_grow() if necessary,
1010 * and finally find an unused if_xname for the target vnet.
1013 if_vmove(struct ifnet *ifp, struct vnet *new_vnet)
1018 * Detach from current vnet, but preserve LLADDR info, do not
1019 * mark as dead etc. so that the ifnet can be reattached later.
1021 if_detach_internal(ifp, 1);
1024 * Unlink the ifnet from ifindex_table[] in current vnet, and shrink
1025 * the if_index for that vnet if possible.
1027 * NOTE: IFNET_WLOCK/IFNET_WUNLOCK() are assumed to be unvirtualized,
1028 * or we'd lock on one vnet and unlock on another.
1031 ifindex_free_locked(ifp->if_index);
1035 * Perform interface-specific reassignment tasks, if provided by
1038 if (ifp->if_reassign != NULL)
1039 ifp->if_reassign(ifp, new_vnet, NULL);
1042 * Switch to the context of the target vnet.
1044 CURVNET_SET_QUIET(new_vnet);
1047 if (ifindex_alloc_locked(&idx) != 0) {
1049 panic("if_index overflow");
1051 ifp->if_index = idx;
1052 ifnet_setbyindex_locked(ifp->if_index, ifp);
1055 if_attach_internal(ifp, 1);
1061 * Move an ifnet to or from another child prison/vnet, specified by the jail id.
1064 if_vmove_loan(struct thread *td, struct ifnet *ifp, char *ifname, int jid)
1069 /* Try to find the prison within our visibility. */
1070 sx_slock(&allprison_lock);
1071 pr = prison_find_child(td->td_ucred->cr_prison, jid);
1072 sx_sunlock(&allprison_lock);
1075 prison_hold_locked(pr);
1076 mtx_unlock(&pr->pr_mtx);
1078 /* Do not try to move the iface from and to the same prison. */
1079 if (pr->pr_vnet == ifp->if_vnet) {
1084 /* Make sure the named iface does not exists in the dst. prison/vnet. */
1085 /* XXX Lock interfaces to avoid races. */
1086 CURVNET_SET_QUIET(pr->pr_vnet);
1087 difp = ifunit(ifname);
1094 /* Move the interface into the child jail/vnet. */
1095 if_vmove(ifp, pr->pr_vnet);
1097 /* Report the new if_xname back to the userland. */
1098 sprintf(ifname, "%s", ifp->if_xname);
1105 if_vmove_reclaim(struct thread *td, char *ifname, int jid)
1108 struct vnet *vnet_dst;
1111 /* Try to find the prison within our visibility. */
1112 sx_slock(&allprison_lock);
1113 pr = prison_find_child(td->td_ucred->cr_prison, jid);
1114 sx_sunlock(&allprison_lock);
1117 prison_hold_locked(pr);
1118 mtx_unlock(&pr->pr_mtx);
1120 /* Make sure the named iface exists in the source prison/vnet. */
1121 CURVNET_SET(pr->pr_vnet);
1122 ifp = ifunit(ifname); /* XXX Lock to avoid races. */
1129 /* Do not try to move the iface from and to the same prison. */
1130 vnet_dst = TD_TO_VNET(td);
1131 if (vnet_dst == ifp->if_vnet) {
1137 /* Get interface back from child jail/vnet. */
1138 if_vmove(ifp, vnet_dst);
1141 /* Report the new if_xname back to the userland. */
1142 sprintf(ifname, "%s", ifp->if_xname);
1150 * Add a group to an interface
1153 if_addgroup(struct ifnet *ifp, const char *groupname)
1155 struct ifg_list *ifgl;
1156 struct ifg_group *ifg = NULL;
1157 struct ifg_member *ifgm;
1160 if (groupname[0] && groupname[strlen(groupname) - 1] >= '0' &&
1161 groupname[strlen(groupname) - 1] <= '9')
1165 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next)
1166 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) {
1171 if ((ifgl = (struct ifg_list *)malloc(sizeof(struct ifg_list), M_TEMP,
1172 M_NOWAIT)) == NULL) {
1177 if ((ifgm = (struct ifg_member *)malloc(sizeof(struct ifg_member),
1178 M_TEMP, M_NOWAIT)) == NULL) {
1184 TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next)
1185 if (!strcmp(ifg->ifg_group, groupname))
1189 if ((ifg = (struct ifg_group *)malloc(sizeof(struct ifg_group),
1190 M_TEMP, M_NOWAIT)) == NULL) {
1196 strlcpy(ifg->ifg_group, groupname, sizeof(ifg->ifg_group));
1197 ifg->ifg_refcnt = 0;
1198 TAILQ_INIT(&ifg->ifg_members);
1199 TAILQ_INSERT_TAIL(&V_ifg_head, ifg, ifg_next);
1204 ifgl->ifgl_group = ifg;
1205 ifgm->ifgm_ifp = ifp;
1208 TAILQ_INSERT_TAIL(&ifg->ifg_members, ifgm, ifgm_next);
1209 TAILQ_INSERT_TAIL(&ifp->if_groups, ifgl, ifgl_next);
1210 IF_ADDR_WUNLOCK(ifp);
1215 EVENTHANDLER_INVOKE(group_attach_event, ifg);
1216 EVENTHANDLER_INVOKE(group_change_event, groupname);
1222 * Remove a group from an interface
1225 if_delgroup(struct ifnet *ifp, const char *groupname)
1227 struct ifg_list *ifgl;
1228 struct ifg_member *ifgm;
1231 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next)
1232 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname))
1240 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next);
1241 IF_ADDR_WUNLOCK(ifp);
1243 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next)
1244 if (ifgm->ifgm_ifp == ifp)
1248 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, ifgm_next);
1252 if (--ifgl->ifgl_group->ifg_refcnt == 0) {
1253 TAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_next);
1255 EVENTHANDLER_INVOKE(group_detach_event, ifgl->ifgl_group);
1256 free(ifgl->ifgl_group, M_TEMP);
1262 EVENTHANDLER_INVOKE(group_change_event, groupname);
1268 * Remove an interface from all groups
1271 if_delgroups(struct ifnet *ifp)
1273 struct ifg_list *ifgl;
1274 struct ifg_member *ifgm;
1275 char groupname[IFNAMSIZ];
1278 while (!TAILQ_EMPTY(&ifp->if_groups)) {
1279 ifgl = TAILQ_FIRST(&ifp->if_groups);
1281 strlcpy(groupname, ifgl->ifgl_group->ifg_group, IFNAMSIZ);
1284 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next);
1285 IF_ADDR_WUNLOCK(ifp);
1287 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next)
1288 if (ifgm->ifgm_ifp == ifp)
1292 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm,
1297 if (--ifgl->ifgl_group->ifg_refcnt == 0) {
1298 TAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_next);
1300 EVENTHANDLER_INVOKE(group_detach_event,
1302 free(ifgl->ifgl_group, M_TEMP);
1308 EVENTHANDLER_INVOKE(group_change_event, groupname);
1316 * Stores all groups from an interface in memory pointed
1320 if_getgroup(struct ifgroupreq *data, struct ifnet *ifp)
1323 struct ifg_list *ifgl;
1324 struct ifg_req ifgrq, *ifgp;
1325 struct ifgroupreq *ifgr = data;
1327 if (ifgr->ifgr_len == 0) {
1329 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next)
1330 ifgr->ifgr_len += sizeof(struct ifg_req);
1331 IF_ADDR_RUNLOCK(ifp);
1335 len = ifgr->ifgr_len;
1336 ifgp = ifgr->ifgr_groups;
1339 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) {
1340 if (len < sizeof(ifgrq)) {
1341 IF_ADDR_RUNLOCK(ifp);
1344 bzero(&ifgrq, sizeof ifgrq);
1345 strlcpy(ifgrq.ifgrq_group, ifgl->ifgl_group->ifg_group,
1346 sizeof(ifgrq.ifgrq_group));
1347 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) {
1348 IF_ADDR_RUNLOCK(ifp);
1351 len -= sizeof(ifgrq);
1354 IF_ADDR_RUNLOCK(ifp);
1360 * Stores all members of a group in memory pointed to by data
1363 if_getgroupmembers(struct ifgroupreq *data)
1365 struct ifgroupreq *ifgr = data;
1366 struct ifg_group *ifg;
1367 struct ifg_member *ifgm;
1368 struct ifg_req ifgrq, *ifgp;
1372 TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next)
1373 if (!strcmp(ifg->ifg_group, ifgr->ifgr_name))
1380 if (ifgr->ifgr_len == 0) {
1381 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next)
1382 ifgr->ifgr_len += sizeof(ifgrq);
1387 len = ifgr->ifgr_len;
1388 ifgp = ifgr->ifgr_groups;
1389 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) {
1390 if (len < sizeof(ifgrq)) {
1394 bzero(&ifgrq, sizeof ifgrq);
1395 strlcpy(ifgrq.ifgrq_member, ifgm->ifgm_ifp->if_xname,
1396 sizeof(ifgrq.ifgrq_member));
1397 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) {
1401 len -= sizeof(ifgrq);
1410 * Delete Routes for a Network Interface
1412 * Called for each routing entry via the rnh->rnh_walktree() call above
1413 * to delete all route entries referencing a detaching network interface.
1416 * rn pointer to node in the routing table
1417 * arg argument passed to rnh->rnh_walktree() - detaching interface
1421 * errno failed - reason indicated
1425 if_rtdel(struct radix_node *rn, void *arg)
1427 struct rtentry *rt = (struct rtentry *)rn;
1428 struct ifnet *ifp = arg;
1431 if (rt->rt_ifp == ifp) {
1434 * Protect (sorta) against walktree recursion problems
1435 * with cloned routes
1437 if ((rt->rt_flags & RTF_UP) == 0)
1440 err = rtrequest_fib(RTM_DELETE, rt_key(rt), rt->rt_gateway,
1442 rt->rt_flags|RTF_RNH_LOCKED|RTF_PINNED,
1443 (struct rtentry **) NULL, rt->rt_fibnum);
1445 log(LOG_WARNING, "if_rtdel: error %d\n", err);
1453 * A compatibility function returns ifnet counter values.
1456 if_get_counter_default(struct ifnet *ifp, ift_counter cnt)
1459 KASSERT(cnt < IFCOUNTERS, ("%s: invalid cnt %d", __func__, cnt));
1461 case IFCOUNTER_IPACKETS:
1462 return (ifp->if_ipackets);
1463 case IFCOUNTER_IERRORS:
1464 return (ifp->if_ierrors);
1465 case IFCOUNTER_OPACKETS:
1466 return (ifp->if_opackets);
1467 case IFCOUNTER_OERRORS:
1468 return (ifp->if_oerrors);
1469 case IFCOUNTER_COLLISIONS:
1470 return (ifp->if_collisions);
1471 case IFCOUNTER_IBYTES:
1472 return (ifp->if_ibytes);
1473 case IFCOUNTER_OBYTES:
1474 return (ifp->if_obytes);
1475 case IFCOUNTER_IMCASTS:
1476 return (ifp->if_imcasts);
1477 case IFCOUNTER_OMCASTS:
1478 return (ifp->if_omcasts);
1479 case IFCOUNTER_IQDROPS:
1480 return (ifp->if_iqdrops);
1482 case IFCOUNTER_OQDROPS:
1483 return (ifp->if_oqdrops);
1485 case IFCOUNTER_NOPROTO:
1486 return (ifp->if_noproto);
1494 * Increase an ifnet counter. Usually used for counters shared
1495 * between the stack and a driver, but function supports them all.
1498 if_inc_counter(struct ifnet *ifp, ift_counter cnt, int64_t inc)
1501 KASSERT(cnt < IFCOUNTERS, ("%s: invalid cnt %d", __func__, cnt));
1503 case IFCOUNTER_IPACKETS:
1504 ifp->if_ipackets += inc;
1506 case IFCOUNTER_IERRORS:
1507 ifp->if_ierrors += inc;
1509 case IFCOUNTER_OPACKETS:
1510 ifp->if_opackets += inc;
1512 case IFCOUNTER_OERRORS:
1513 ifp->if_oerrors += inc;
1515 case IFCOUNTER_COLLISIONS:
1516 ifp->if_collisions += inc;
1518 case IFCOUNTER_IBYTES:
1519 ifp->if_ibytes += inc;
1521 case IFCOUNTER_OBYTES:
1522 ifp->if_obytes += inc;
1524 case IFCOUNTER_IMCASTS:
1525 ifp->if_imcasts += inc;
1527 case IFCOUNTER_OMCASTS:
1528 ifp->if_omcasts += inc;
1530 case IFCOUNTER_IQDROPS:
1531 ifp->if_iqdrops += inc;
1534 case IFCOUNTER_OQDROPS:
1535 ifp->if_oqdrops += inc;
1538 case IFCOUNTER_NOPROTO:
1539 ifp->if_noproto += inc;
1547 * Wrapper functions for struct ifnet address list locking macros. These are
1548 * used by kernel modules to avoid encoding programming interface or binary
1549 * interface assumptions that may be violated when kernel-internal locking
1550 * approaches change.
1553 if_addr_rlock(struct ifnet *ifp)
1560 if_addr_runlock(struct ifnet *ifp)
1563 IF_ADDR_RUNLOCK(ifp);
1567 if_maddr_rlock(struct ifnet *ifp)
1574 if_maddr_runlock(struct ifnet *ifp)
1577 IF_ADDR_RUNLOCK(ifp);
1581 * Initialization, destruction and refcounting functions for ifaddrs.
1584 ifa_init(struct ifaddr *ifa)
1587 mtx_init(&ifa->ifa_mtx, "ifaddr", NULL, MTX_DEF);
1588 refcount_init(&ifa->ifa_refcnt, 1);
1589 ifa->if_data.ifi_datalen = sizeof(ifa->if_data);
1593 ifa_ref(struct ifaddr *ifa)
1596 refcount_acquire(&ifa->ifa_refcnt);
1600 ifa_free(struct ifaddr *ifa)
1603 if (refcount_release(&ifa->ifa_refcnt)) {
1604 mtx_destroy(&ifa->ifa_mtx);
1605 free(ifa, M_IFADDR);
1610 ifa_add_loopback_route(struct ifaddr *ifa, struct sockaddr *ia)
1613 struct rtentry *rt = NULL;
1614 struct rt_addrinfo info;
1615 static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK};
1617 bzero(&info, sizeof(info));
1618 info.rti_ifp = V_loif;
1619 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC;
1620 info.rti_info[RTAX_DST] = ia;
1621 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl;
1622 error = rtrequest1_fib(RTM_ADD, &info, &rt, ifa->ifa_ifp->if_fib);
1624 if (error == 0 && rt != NULL) {
1626 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_type =
1627 ifa->ifa_ifp->if_type;
1628 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_index =
1629 ifa->ifa_ifp->if_index;
1632 } else if (error != 0)
1633 log(LOG_DEBUG, "%s: insertion failed: %u\n", __func__, error);
1639 ifa_del_loopback_route(struct ifaddr *ifa, struct sockaddr *ia)
1642 struct rt_addrinfo info;
1643 struct sockaddr_dl null_sdl;
1645 bzero(&null_sdl, sizeof(null_sdl));
1646 null_sdl.sdl_len = sizeof(null_sdl);
1647 null_sdl.sdl_family = AF_LINK;
1648 null_sdl.sdl_type = ifa->ifa_ifp->if_type;
1649 null_sdl.sdl_index = ifa->ifa_ifp->if_index;
1650 bzero(&info, sizeof(info));
1651 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC;
1652 info.rti_info[RTAX_DST] = ia;
1653 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl;
1654 error = rtrequest1_fib(RTM_DELETE, &info, NULL, ifa->ifa_ifp->if_fib);
1657 log(LOG_DEBUG, "%s: deletion failed: %u\n", __func__, error);
1663 * XXX: Because sockaddr_dl has deeper structure than the sockaddr
1664 * structs used to represent other address families, it is necessary
1665 * to perform a different comparison.
1668 #define sa_equal(a1, a2) \
1669 (bcmp((a1), (a2), ((a1))->sa_len) == 0)
1671 #define sa_dl_equal(a1, a2) \
1672 ((((struct sockaddr_dl *)(a1))->sdl_len == \
1673 ((struct sockaddr_dl *)(a2))->sdl_len) && \
1674 (bcmp(LLADDR((struct sockaddr_dl *)(a1)), \
1675 LLADDR((struct sockaddr_dl *)(a2)), \
1676 ((struct sockaddr_dl *)(a1))->sdl_alen) == 0))
1679 * Locate an interface based on a complete address.
1682 static struct ifaddr *
1683 ifa_ifwithaddr_internal(struct sockaddr *addr, int getref)
1688 IFNET_RLOCK_NOSLEEP();
1689 TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1691 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1692 if (ifa->ifa_addr->sa_family != addr->sa_family)
1694 if (sa_equal(addr, ifa->ifa_addr)) {
1697 IF_ADDR_RUNLOCK(ifp);
1700 /* IP6 doesn't have broadcast */
1701 if ((ifp->if_flags & IFF_BROADCAST) &&
1702 ifa->ifa_broadaddr &&
1703 ifa->ifa_broadaddr->sa_len != 0 &&
1704 sa_equal(ifa->ifa_broadaddr, addr)) {
1707 IF_ADDR_RUNLOCK(ifp);
1711 IF_ADDR_RUNLOCK(ifp);
1715 IFNET_RUNLOCK_NOSLEEP();
1720 ifa_ifwithaddr(struct sockaddr *addr)
1723 return (ifa_ifwithaddr_internal(addr, 1));
1727 ifa_ifwithaddr_check(struct sockaddr *addr)
1730 return (ifa_ifwithaddr_internal(addr, 0) != NULL);
1734 * Locate an interface based on the broadcast address.
1738 ifa_ifwithbroadaddr(struct sockaddr *addr)
1743 IFNET_RLOCK_NOSLEEP();
1744 TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1746 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1747 if (ifa->ifa_addr->sa_family != addr->sa_family)
1749 if ((ifp->if_flags & IFF_BROADCAST) &&
1750 ifa->ifa_broadaddr &&
1751 ifa->ifa_broadaddr->sa_len != 0 &&
1752 sa_equal(ifa->ifa_broadaddr, addr)) {
1754 IF_ADDR_RUNLOCK(ifp);
1758 IF_ADDR_RUNLOCK(ifp);
1762 IFNET_RUNLOCK_NOSLEEP();
1767 * Locate the point to point interface with a given destination address.
1771 ifa_ifwithdstaddr_fib(struct sockaddr *addr, int fibnum)
1776 IFNET_RLOCK_NOSLEEP();
1777 TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1778 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
1780 if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum))
1783 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1784 if (ifa->ifa_addr->sa_family != addr->sa_family)
1786 if (ifa->ifa_dstaddr != NULL &&
1787 sa_equal(addr, ifa->ifa_dstaddr)) {
1789 IF_ADDR_RUNLOCK(ifp);
1793 IF_ADDR_RUNLOCK(ifp);
1797 IFNET_RUNLOCK_NOSLEEP();
1802 ifa_ifwithdstaddr(struct sockaddr *addr)
1805 return (ifa_ifwithdstaddr_fib(addr, RT_ALL_FIBS));
1809 * Find an interface on a specific network. If many, choice
1810 * is most specific found.
1813 ifa_ifwithnet_fib(struct sockaddr *addr, int ignore_ptp, int fibnum)
1817 struct ifaddr *ifa_maybe = NULL;
1818 u_int af = addr->sa_family;
1819 char *addr_data = addr->sa_data, *cplim;
1822 * AF_LINK addresses can be looked up directly by their index number,
1823 * so do that if we can.
1825 if (af == AF_LINK) {
1826 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr;
1827 if (sdl->sdl_index && sdl->sdl_index <= V_if_index)
1828 return (ifaddr_byindex(sdl->sdl_index));
1832 * Scan though each interface, looking for ones that have addresses
1833 * in this address family and the requested fib. Maintain a reference
1834 * on ifa_maybe once we find one, as we release the IF_ADDR_RLOCK() that
1835 * kept it stable when we move onto the next interface.
1837 IFNET_RLOCK_NOSLEEP();
1838 TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1839 if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum))
1842 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1843 char *cp, *cp2, *cp3;
1845 if (ifa->ifa_addr->sa_family != af)
1847 if (af == AF_INET &&
1848 ifp->if_flags & IFF_POINTOPOINT && !ignore_ptp) {
1850 * This is a bit broken as it doesn't
1851 * take into account that the remote end may
1852 * be a single node in the network we are
1854 * The trouble is that we don't know the
1855 * netmask for the remote end.
1857 if (ifa->ifa_dstaddr != NULL &&
1858 sa_equal(addr, ifa->ifa_dstaddr)) {
1860 IF_ADDR_RUNLOCK(ifp);
1865 * if we have a special address handler,
1866 * then use it instead of the generic one.
1868 if (ifa->ifa_claim_addr) {
1869 if ((*ifa->ifa_claim_addr)(ifa, addr)) {
1871 IF_ADDR_RUNLOCK(ifp);
1878 * Scan all the bits in the ifa's address.
1879 * If a bit dissagrees with what we are
1880 * looking for, mask it with the netmask
1881 * to see if it really matters.
1882 * (A byte at a time)
1884 if (ifa->ifa_netmask == 0)
1887 cp2 = ifa->ifa_addr->sa_data;
1888 cp3 = ifa->ifa_netmask->sa_data;
1889 cplim = ifa->ifa_netmask->sa_len
1890 + (char *)ifa->ifa_netmask;
1892 if ((*cp++ ^ *cp2++) & *cp3++)
1893 goto next; /* next address! */
1895 * If the netmask of what we just found
1896 * is more specific than what we had before
1897 * (if we had one), or if the virtual status
1898 * of new prefix is better than of the old one,
1899 * then remember the new one before continuing
1900 * to search for an even better one.
1902 if (ifa_maybe == NULL ||
1903 ifa_preferred(ifa_maybe, ifa) ||
1904 rn_refines((caddr_t)ifa->ifa_netmask,
1905 (caddr_t)ifa_maybe->ifa_netmask)) {
1906 if (ifa_maybe != NULL)
1907 ifa_free(ifa_maybe);
1913 IF_ADDR_RUNLOCK(ifp);
1918 IFNET_RUNLOCK_NOSLEEP();
1919 if (ifa_maybe != NULL)
1920 ifa_free(ifa_maybe);
1925 ifa_ifwithnet(struct sockaddr *addr, int ignore_ptp)
1928 return (ifa_ifwithnet_fib(addr, ignore_ptp, RT_ALL_FIBS));
1932 * Find an interface address specific to an interface best matching
1936 ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp)
1939 char *cp, *cp2, *cp3;
1941 struct ifaddr *ifa_maybe = NULL;
1942 u_int af = addr->sa_family;
1947 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1948 if (ifa->ifa_addr->sa_family != af)
1950 if (ifa_maybe == NULL)
1952 if (ifa->ifa_netmask == 0) {
1953 if (sa_equal(addr, ifa->ifa_addr) ||
1954 (ifa->ifa_dstaddr &&
1955 sa_equal(addr, ifa->ifa_dstaddr)))
1959 if (ifp->if_flags & IFF_POINTOPOINT) {
1960 if (sa_equal(addr, ifa->ifa_dstaddr))
1964 cp2 = ifa->ifa_addr->sa_data;
1965 cp3 = ifa->ifa_netmask->sa_data;
1966 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask;
1967 for (; cp3 < cplim; cp3++)
1968 if ((*cp++ ^ *cp2++) & *cp3)
1978 IF_ADDR_RUNLOCK(ifp);
1983 * See whether new ifa is better than current one:
1984 * 1) A non-virtual one is preferred over virtual.
1985 * 2) A virtual in master state preferred over any other state.
1987 * Used in several address selecting functions.
1990 ifa_preferred(struct ifaddr *cur, struct ifaddr *next)
1993 return (cur->ifa_carp && (!next->ifa_carp ||
1994 ((*carp_master_p)(next) && !(*carp_master_p)(cur))));
1997 #include <net/if_llatbl.h>
2000 * Default action when installing a route with a Link Level gateway.
2001 * Lookup an appropriate real ifa to point to.
2002 * This should be moved to /sys/net/link.c eventually.
2005 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info)
2007 struct ifaddr *ifa, *oifa;
2008 struct sockaddr *dst;
2013 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) ||
2014 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0))
2016 ifa = ifaof_ifpforaddr(dst, ifp);
2021 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest)
2022 ifa->ifa_rtrequest(cmd, rt, info);
2027 * Mark an interface down and notify protocols of
2031 if_unroute(struct ifnet *ifp, int flag, int fam)
2035 KASSERT(flag == IFF_UP, ("if_unroute: flag != IFF_UP"));
2037 ifp->if_flags &= ~flag;
2038 getmicrotime(&ifp->if_lastchange);
2039 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
2040 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family))
2041 pfctlinput(PRC_IFDOWN, ifa->ifa_addr);
2042 ifp->if_qflush(ifp);
2045 (*carp_linkstate_p)(ifp);
2050 * Mark an interface up and notify protocols of
2054 if_route(struct ifnet *ifp, int flag, int fam)
2058 KASSERT(flag == IFF_UP, ("if_route: flag != IFF_UP"));
2060 ifp->if_flags |= flag;
2061 getmicrotime(&ifp->if_lastchange);
2062 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
2063 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family))
2064 pfctlinput(PRC_IFUP, ifa->ifa_addr);
2066 (*carp_linkstate_p)(ifp);
2073 void (*vlan_link_state_p)(struct ifnet *); /* XXX: private from if_vlan */
2074 void (*vlan_trunk_cap_p)(struct ifnet *); /* XXX: private from if_vlan */
2075 struct ifnet *(*vlan_trunkdev_p)(struct ifnet *);
2076 struct ifnet *(*vlan_devat_p)(struct ifnet *, uint16_t);
2077 int (*vlan_tag_p)(struct ifnet *, uint16_t *);
2078 int (*vlan_setcookie_p)(struct ifnet *, void *);
2079 void *(*vlan_cookie_p)(struct ifnet *);
2082 * Handle a change in the interface link state. To avoid LORs
2083 * between driver lock and upper layer locks, as well as possible
2084 * recursions, we post event to taskqueue, and all job
2085 * is done in static do_link_state_change().
2088 if_link_state_change(struct ifnet *ifp, int link_state)
2090 /* Return if state hasn't changed. */
2091 if (ifp->if_link_state == link_state)
2094 ifp->if_link_state = link_state;
2096 taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask);
2100 do_link_state_change(void *arg, int pending)
2102 struct ifnet *ifp = (struct ifnet *)arg;
2103 int link_state = ifp->if_link_state;
2104 CURVNET_SET(ifp->if_vnet);
2106 /* Notify that the link state has changed. */
2108 if (ifp->if_vlantrunk != NULL)
2109 (*vlan_link_state_p)(ifp);
2111 if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) &&
2112 IFP2AC(ifp)->ac_netgraph != NULL)
2113 (*ng_ether_link_state_p)(ifp, link_state);
2115 (*carp_linkstate_p)(ifp);
2117 (*bridge_linkstate_p)(ifp);
2119 (*lagg_linkstate_p)(ifp, link_state);
2121 if (IS_DEFAULT_VNET(curvnet))
2122 devctl_notify("IFNET", ifp->if_xname,
2123 (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN",
2126 if_printf(ifp, "%d link states coalesced\n", pending);
2127 if (log_link_state_change)
2128 log(LOG_NOTICE, "%s: link state changed to %s\n", ifp->if_xname,
2129 (link_state == LINK_STATE_UP) ? "UP" : "DOWN" );
2130 EVENTHANDLER_INVOKE(ifnet_link_event, ifp, ifp->if_link_state);
2135 * Mark an interface down and notify protocols of
2139 if_down(struct ifnet *ifp)
2142 if_unroute(ifp, IFF_UP, AF_UNSPEC);
2146 * Mark an interface up and notify protocols of
2150 if_up(struct ifnet *ifp)
2153 if_route(ifp, IFF_UP, AF_UNSPEC);
2157 * Flush an interface queue.
2160 if_qflush(struct ifnet *ifp)
2168 if (ALTQ_IS_ENABLED(ifq))
2172 while ((m = n) != 0) {
2183 * Map interface name to interface structure pointer, with or without
2184 * returning a reference.
2187 ifunit_ref(const char *name)
2191 IFNET_RLOCK_NOSLEEP();
2192 TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
2193 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0 &&
2194 !(ifp->if_flags & IFF_DYING))
2199 IFNET_RUNLOCK_NOSLEEP();
2204 ifunit(const char *name)
2208 IFNET_RLOCK_NOSLEEP();
2209 TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
2210 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0)
2213 IFNET_RUNLOCK_NOSLEEP();
2218 * Hardware specific interface ioctls.
2221 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td)
2226 int new_flags, temp_flags;
2227 size_t namelen, onamelen;
2229 char *descrbuf, *odescrbuf;
2230 char new_name[IFNAMSIZ];
2232 struct sockaddr_dl *sdl;
2234 ifr = (struct ifreq *)data;
2237 ifr->ifr_index = ifp->if_index;
2241 temp_flags = ifp->if_flags | ifp->if_drv_flags;
2242 ifr->ifr_flags = temp_flags & 0xffff;
2243 ifr->ifr_flagshigh = temp_flags >> 16;
2247 ifr->ifr_reqcap = ifp->if_capabilities;
2248 ifr->ifr_curcap = ifp->if_capenable;
2253 error = mac_ifnet_ioctl_get(td->td_ucred, ifr, ifp);
2258 ifr->ifr_metric = ifp->if_metric;
2262 ifr->ifr_mtu = ifp->if_mtu;
2266 ifr->ifr_phys = ifp->if_physical;
2271 sx_slock(&ifdescr_sx);
2272 if (ifp->if_description == NULL)
2275 /* space for terminating nul */
2276 descrlen = strlen(ifp->if_description) + 1;
2277 if (ifr->ifr_buffer.length < descrlen)
2278 ifr->ifr_buffer.buffer = NULL;
2280 error = copyout(ifp->if_description,
2281 ifr->ifr_buffer.buffer, descrlen);
2282 ifr->ifr_buffer.length = descrlen;
2284 sx_sunlock(&ifdescr_sx);
2288 error = priv_check(td, PRIV_NET_SETIFDESCR);
2293 * Copy only (length-1) bytes to make sure that
2294 * if_description is always nul terminated. The
2295 * length parameter is supposed to count the
2296 * terminating nul in.
2298 if (ifr->ifr_buffer.length > ifdescr_maxlen)
2299 return (ENAMETOOLONG);
2300 else if (ifr->ifr_buffer.length == 0)
2303 descrbuf = malloc(ifr->ifr_buffer.length, M_IFDESCR,
2305 error = copyin(ifr->ifr_buffer.buffer, descrbuf,
2306 ifr->ifr_buffer.length - 1);
2308 free(descrbuf, M_IFDESCR);
2313 sx_xlock(&ifdescr_sx);
2314 odescrbuf = ifp->if_description;
2315 ifp->if_description = descrbuf;
2316 sx_xunlock(&ifdescr_sx);
2318 getmicrotime(&ifp->if_lastchange);
2319 free(odescrbuf, M_IFDESCR);
2323 ifr->ifr_fib = ifp->if_fib;
2327 error = priv_check(td, PRIV_NET_SETIFFIB);
2330 if (ifr->ifr_fib >= rt_numfibs)
2333 ifp->if_fib = ifr->ifr_fib;
2337 error = priv_check(td, PRIV_NET_SETIFFLAGS);
2341 * Currently, no driver owned flags pass the IFF_CANTCHANGE
2342 * check, so we don't need special handling here yet.
2344 new_flags = (ifr->ifr_flags & 0xffff) |
2345 (ifr->ifr_flagshigh << 16);
2346 if (ifp->if_flags & IFF_SMART) {
2347 /* Smart drivers twiddle their own routes */
2348 } else if (ifp->if_flags & IFF_UP &&
2349 (new_flags & IFF_UP) == 0) {
2351 } else if (new_flags & IFF_UP &&
2352 (ifp->if_flags & IFF_UP) == 0) {
2355 /* See if permanently promiscuous mode bit is about to flip */
2356 if ((ifp->if_flags ^ new_flags) & IFF_PPROMISC) {
2357 if (new_flags & IFF_PPROMISC)
2358 ifp->if_flags |= IFF_PROMISC;
2359 else if (ifp->if_pcount == 0)
2360 ifp->if_flags &= ~IFF_PROMISC;
2361 log(LOG_INFO, "%s: permanently promiscuous mode %s\n",
2363 (new_flags & IFF_PPROMISC) ? "enabled" : "disabled");
2365 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) |
2366 (new_flags &~ IFF_CANTCHANGE);
2367 if (ifp->if_ioctl) {
2368 (void) (*ifp->if_ioctl)(ifp, cmd, data);
2370 getmicrotime(&ifp->if_lastchange);
2374 error = priv_check(td, PRIV_NET_SETIFCAP);
2377 if (ifp->if_ioctl == NULL)
2378 return (EOPNOTSUPP);
2379 if (ifr->ifr_reqcap & ~ifp->if_capabilities)
2381 error = (*ifp->if_ioctl)(ifp, cmd, data);
2383 getmicrotime(&ifp->if_lastchange);
2388 error = mac_ifnet_ioctl_set(td->td_ucred, ifr, ifp);
2393 error = priv_check(td, PRIV_NET_SETIFNAME);
2396 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL);
2399 if (new_name[0] == '\0')
2401 if (ifunit(new_name) != NULL)
2405 * XXX: Locking. Nothing else seems to lock if_flags,
2406 * and there are numerous other races with the
2407 * ifunit() checks not being atomic with namespace
2408 * changes (renames, vmoves, if_attach, etc).
2410 ifp->if_flags |= IFF_RENAMING;
2412 /* Announce the departure of the interface. */
2413 rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
2414 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp);
2416 log(LOG_INFO, "%s: changing name to '%s'\n",
2417 ifp->if_xname, new_name);
2419 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname));
2422 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
2423 namelen = strlen(new_name);
2424 onamelen = sdl->sdl_nlen;
2426 * Move the address if needed. This is safe because we
2427 * allocate space for a name of length IFNAMSIZ when we
2428 * create this in if_attach().
2430 if (namelen != onamelen) {
2431 bcopy(sdl->sdl_data + onamelen,
2432 sdl->sdl_data + namelen, sdl->sdl_alen);
2434 bcopy(new_name, sdl->sdl_data, namelen);
2435 sdl->sdl_nlen = namelen;
2436 sdl = (struct sockaddr_dl *)ifa->ifa_netmask;
2437 bzero(sdl->sdl_data, onamelen);
2438 while (namelen != 0)
2439 sdl->sdl_data[--namelen] = 0xff;
2442 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp);
2443 /* Announce the return of the interface. */
2444 rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
2446 ifp->if_flags &= ~IFF_RENAMING;
2451 error = priv_check(td, PRIV_NET_SETIFVNET);
2454 error = if_vmove_loan(td, ifp, ifr->ifr_name, ifr->ifr_jid);
2459 error = priv_check(td, PRIV_NET_SETIFMETRIC);
2462 ifp->if_metric = ifr->ifr_metric;
2463 getmicrotime(&ifp->if_lastchange);
2467 error = priv_check(td, PRIV_NET_SETIFPHYS);
2470 if (ifp->if_ioctl == NULL)
2471 return (EOPNOTSUPP);
2472 error = (*ifp->if_ioctl)(ifp, cmd, data);
2474 getmicrotime(&ifp->if_lastchange);
2479 u_long oldmtu = ifp->if_mtu;
2481 error = priv_check(td, PRIV_NET_SETIFMTU);
2484 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU)
2486 if (ifp->if_ioctl == NULL)
2487 return (EOPNOTSUPP);
2488 error = (*ifp->if_ioctl)(ifp, cmd, data);
2490 getmicrotime(&ifp->if_lastchange);
2494 * If the link MTU changed, do network layer specific procedure.
2496 if (ifp->if_mtu != oldmtu) {
2506 if (cmd == SIOCADDMULTI)
2507 error = priv_check(td, PRIV_NET_ADDMULTI);
2509 error = priv_check(td, PRIV_NET_DELMULTI);
2513 /* Don't allow group membership on non-multicast interfaces. */
2514 if ((ifp->if_flags & IFF_MULTICAST) == 0)
2515 return (EOPNOTSUPP);
2517 /* Don't let users screw up protocols' entries. */
2518 if (ifr->ifr_addr.sa_family != AF_LINK)
2521 if (cmd == SIOCADDMULTI) {
2522 struct ifmultiaddr *ifma;
2525 * Userland is only permitted to join groups once
2526 * via the if_addmulti() KPI, because it cannot hold
2527 * struct ifmultiaddr * between calls. It may also
2528 * lose a race while we check if the membership
2532 ifma = if_findmulti(ifp, &ifr->ifr_addr);
2533 IF_ADDR_RUNLOCK(ifp);
2537 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma);
2539 error = if_delmulti(ifp, &ifr->ifr_addr);
2542 getmicrotime(&ifp->if_lastchange);
2545 case SIOCSIFPHYADDR:
2546 case SIOCDIFPHYADDR:
2548 case SIOCSIFPHYADDR_IN6:
2550 case SIOCSLIFPHYADDR:
2552 case SIOCSIFGENERIC:
2553 error = priv_check(td, PRIV_NET_HWIOCTL);
2556 if (ifp->if_ioctl == NULL)
2557 return (EOPNOTSUPP);
2558 error = (*ifp->if_ioctl)(ifp, cmd, data);
2560 getmicrotime(&ifp->if_lastchange);
2564 ifs = (struct ifstat *)data;
2565 ifs->ascii[0] = '\0';
2567 case SIOCGIFPSRCADDR:
2568 case SIOCGIFPDSTADDR:
2569 case SIOCGLIFPHYADDR:
2571 case SIOCGIFGENERIC:
2572 if (ifp->if_ioctl == NULL)
2573 return (EOPNOTSUPP);
2574 error = (*ifp->if_ioctl)(ifp, cmd, data);
2578 error = priv_check(td, PRIV_NET_SETLLADDR);
2581 error = if_setlladdr(ifp,
2582 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len);
2583 EVENTHANDLER_INVOKE(iflladdr_event, ifp);
2588 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr;
2590 error = priv_check(td, PRIV_NET_ADDIFGROUP);
2593 if ((error = if_addgroup(ifp, ifgr->ifgr_group)))
2599 if ((error = if_getgroup((struct ifgroupreq *)ifr, ifp)))
2605 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr;
2607 error = priv_check(td, PRIV_NET_DELIFGROUP);
2610 if ((error = if_delgroup(ifp, ifgr->ifgr_group)))
2622 #ifdef COMPAT_FREEBSD32
2630 #define SIOCGIFCONF32 _IOWR('i', 36, struct ifconf32)
2637 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td)
2644 CURVNET_SET(so->so_vnet);
2648 error = ifconf(cmd, data);
2652 #ifdef COMPAT_FREEBSD32
2655 struct ifconf32 *ifc32;
2658 ifc32 = (struct ifconf32 *)data;
2659 ifc.ifc_len = ifc32->ifc_len;
2660 ifc.ifc_buf = PTRIN(ifc32->ifc_buf);
2662 error = ifconf(SIOCGIFCONF, (void *)&ifc);
2665 ifc32->ifc_len = ifc.ifc_len;
2670 ifr = (struct ifreq *)data;
2675 error = priv_check(td, PRIV_NET_SETIFVNET);
2677 error = if_vmove_reclaim(td, ifr->ifr_name,
2684 error = priv_check(td, PRIV_NET_IFCREATE);
2686 error = if_clone_create(ifr->ifr_name,
2687 sizeof(ifr->ifr_name),
2688 cmd == SIOCIFCREATE2 ? ifr->ifr_data : NULL);
2692 error = priv_check(td, PRIV_NET_IFDESTROY);
2694 error = if_clone_destroy(ifr->ifr_name);
2698 case SIOCIFGCLONERS:
2699 error = if_clone_list((struct if_clonereq *)data);
2703 error = if_getgroupmembers((struct ifgroupreq *)data);
2706 #if defined(INET) || defined(INET6)
2709 if (carp_ioctl_p == NULL)
2710 error = EPROTONOSUPPORT;
2712 error = (*carp_ioctl_p)(ifr, cmd, td);
2718 ifp = ifunit_ref(ifr->ifr_name);
2724 error = ifhwioctl(cmd, ifp, data, td);
2725 if (error != ENOIOCTL) {
2731 oif_flags = ifp->if_flags;
2732 if (so->so_proto == NULL) {
2735 return (EOPNOTSUPP);
2739 * Pass the request on to the socket control method, and if the
2740 * latter returns EOPNOTSUPP, directly to the interface.
2742 * Make an exception for the legacy SIOCSIF* requests. Drivers
2743 * trust SIOCSIFADDR et al to come from an already privileged
2744 * layer, and do not perform any credentials checks or input
2748 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd,
2751 if (error == EOPNOTSUPP && ifp != NULL && ifp->if_ioctl != NULL &&
2752 cmd != SIOCSIFADDR && cmd != SIOCSIFBRDADDR &&
2753 cmd != SIOCSIFDSTADDR && cmd != SIOCSIFNETMASK)
2754 error = (*ifp->if_ioctl)(ifp, cmd, data);
2761 case SIOCSIFDSTADDR:
2763 case SIOCSIFBRDADDR:
2764 case SIOCSIFNETMASK:
2765 #if BYTE_ORDER != BIG_ENDIAN
2766 if (ifr->ifr_addr.sa_family == 0 &&
2767 ifr->ifr_addr.sa_len < 16) {
2768 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len;
2769 ifr->ifr_addr.sa_len = 16;
2772 if (ifr->ifr_addr.sa_len == 0)
2773 ifr->ifr_addr.sa_len = 16;
2781 case OSIOCGIFDSTADDR:
2782 cmd = SIOCGIFDSTADDR;
2785 case OSIOCGIFBRDADDR:
2786 cmd = SIOCGIFBRDADDR;
2789 case OSIOCGIFNETMASK:
2790 cmd = SIOCGIFNETMASK;
2792 error = ((*so->so_proto->pr_usrreqs->pru_control)(so,
2796 if (error == EOPNOTSUPP && ifp != NULL &&
2797 ifp->if_ioctl != NULL &&
2798 cmd != SIOCSIFADDR && cmd != SIOCSIFBRDADDR &&
2799 cmd != SIOCSIFDSTADDR && cmd != SIOCSIFNETMASK)
2800 error = (*ifp->if_ioctl)(ifp, cmd, data);
2804 case OSIOCGIFDSTADDR:
2805 case OSIOCGIFBRDADDR:
2806 case OSIOCGIFNETMASK:
2807 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family;
2811 #endif /* COMPAT_43 */
2813 if ((oif_flags ^ ifp->if_flags) & IFF_UP) {
2815 if (ifp->if_flags & IFF_UP)
2825 * The code common to handling reference counted flags,
2826 * e.g., in ifpromisc() and if_allmulti().
2827 * The "pflag" argument can specify a permanent mode flag to check,
2828 * such as IFF_PPROMISC for promiscuous mode; should be 0 if none.
2830 * Only to be used on stack-owned flags, not driver-owned flags.
2833 if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch)
2837 int oldflags, oldcount;
2839 /* Sanity checks to catch programming errors */
2840 KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0,
2841 ("%s: setting driver-owned flag %d", __func__, flag));
2844 KASSERT(*refcount >= 0,
2845 ("%s: increment negative refcount %d for flag %d",
2846 __func__, *refcount, flag));
2848 KASSERT(*refcount > 0,
2849 ("%s: decrement non-positive refcount %d for flag %d",
2850 __func__, *refcount, flag));
2852 /* In case this mode is permanent, just touch refcount */
2853 if (ifp->if_flags & pflag) {
2854 *refcount += onswitch ? 1 : -1;
2858 /* Save ifnet parameters for if_ioctl() may fail */
2859 oldcount = *refcount;
2860 oldflags = ifp->if_flags;
2863 * See if we aren't the only and touching refcount is enough.
2864 * Actually toggle interface flag if we are the first or last.
2869 ifp->if_flags |= flag;
2873 ifp->if_flags &= ~flag;
2876 /* Call down the driver since we've changed interface flags */
2877 if (ifp->if_ioctl == NULL) {
2881 ifr.ifr_flags = ifp->if_flags & 0xffff;
2882 ifr.ifr_flagshigh = ifp->if_flags >> 16;
2883 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
2886 /* Notify userland that interface flags have changed */
2891 /* Recover after driver error */
2892 *refcount = oldcount;
2893 ifp->if_flags = oldflags;
2898 * Set/clear promiscuous mode on interface ifp based on the truth value
2899 * of pswitch. The calls are reference counted so that only the first
2900 * "on" request actually has an effect, as does the final "off" request.
2901 * Results are undefined if the "off" and "on" requests are not matched.
2904 ifpromisc(struct ifnet *ifp, int pswitch)
2907 int oldflags = ifp->if_flags;
2909 error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC,
2910 &ifp->if_pcount, pswitch);
2911 /* If promiscuous mode status has changed, log a message */
2912 if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC))
2913 log(LOG_INFO, "%s: promiscuous mode %s\n",
2915 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled");
2920 * Return interface configuration
2921 * of system. List may be used
2922 * in later ioctl's (above) to get
2923 * other information.
2927 ifconf(u_long cmd, caddr_t data)
2929 struct ifconf *ifc = (struct ifconf *)data;
2934 int error, full = 0, valid_len, max_len;
2936 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */
2937 max_len = MAXPHYS - 1;
2939 /* Prevent hostile input from being able to crash the system */
2940 if (ifc->ifc_len <= 0)
2944 if (ifc->ifc_len <= max_len) {
2945 max_len = ifc->ifc_len;
2948 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN);
2953 TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
2957 * Zero the ifr_name buffer to make sure we don't
2958 * disclose the contents of the stack.
2960 memset(ifr.ifr_name, 0, sizeof(ifr.ifr_name));
2962 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name))
2963 >= sizeof(ifr.ifr_name)) {
2966 return (ENAMETOOLONG);
2971 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2972 struct sockaddr *sa = ifa->ifa_addr;
2974 if (prison_if(curthread->td_ucred, sa) != 0)
2978 if (cmd == OSIOCGIFCONF) {
2979 struct osockaddr *osa =
2980 (struct osockaddr *)&ifr.ifr_addr;
2982 osa->sa_family = sa->sa_family;
2983 sbuf_bcat(sb, &ifr, sizeof(ifr));
2984 max_len += sizeof(ifr);
2987 if (sa->sa_len <= sizeof(*sa)) {
2989 sbuf_bcat(sb, &ifr, sizeof(ifr));
2990 max_len += sizeof(ifr);
2993 offsetof(struct ifreq, ifr_addr));
2994 max_len += offsetof(struct ifreq, ifr_addr);
2995 sbuf_bcat(sb, sa, sa->sa_len);
2996 max_len += sa->sa_len;
2999 if (sbuf_error(sb) == 0)
3000 valid_len = sbuf_len(sb);
3002 IF_ADDR_RUNLOCK(ifp);
3004 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
3005 sbuf_bcat(sb, &ifr, sizeof(ifr));
3006 max_len += sizeof(ifr);
3008 if (sbuf_error(sb) == 0)
3009 valid_len = sbuf_len(sb);
3015 * If we didn't allocate enough space (uncommon), try again. If
3016 * we have already allocated as much space as we are allowed,
3017 * return what we've got.
3019 if (valid_len != max_len && !full) {
3024 ifc->ifc_len = valid_len;
3026 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len);
3032 * Just like ifpromisc(), but for all-multicast-reception mode.
3035 if_allmulti(struct ifnet *ifp, int onswitch)
3038 return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch));
3041 struct ifmultiaddr *
3042 if_findmulti(struct ifnet *ifp, struct sockaddr *sa)
3044 struct ifmultiaddr *ifma;
3046 IF_ADDR_LOCK_ASSERT(ifp);
3048 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
3049 if (sa->sa_family == AF_LINK) {
3050 if (sa_dl_equal(ifma->ifma_addr, sa))
3053 if (sa_equal(ifma->ifma_addr, sa))
3062 * Allocate a new ifmultiaddr and initialize based on passed arguments. We
3063 * make copies of passed sockaddrs. The ifmultiaddr will not be added to
3064 * the ifnet multicast address list here, so the caller must do that and
3065 * other setup work (such as notifying the device driver). The reference
3066 * count is initialized to 1.
3068 static struct ifmultiaddr *
3069 if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa,
3072 struct ifmultiaddr *ifma;
3073 struct sockaddr *dupsa;
3075 ifma = malloc(sizeof *ifma, M_IFMADDR, mflags |
3080 dupsa = malloc(sa->sa_len, M_IFMADDR, mflags);
3081 if (dupsa == NULL) {
3082 free(ifma, M_IFMADDR);
3085 bcopy(sa, dupsa, sa->sa_len);
3086 ifma->ifma_addr = dupsa;
3088 ifma->ifma_ifp = ifp;
3089 ifma->ifma_refcount = 1;
3090 ifma->ifma_protospec = NULL;
3093 ifma->ifma_lladdr = NULL;
3097 dupsa = malloc(llsa->sa_len, M_IFMADDR, mflags);
3098 if (dupsa == NULL) {
3099 free(ifma->ifma_addr, M_IFMADDR);
3100 free(ifma, M_IFMADDR);
3103 bcopy(llsa, dupsa, llsa->sa_len);
3104 ifma->ifma_lladdr = dupsa;
3110 * if_freemulti: free ifmultiaddr structure and possibly attached related
3111 * addresses. The caller is responsible for implementing reference
3112 * counting, notifying the driver, handling routing messages, and releasing
3113 * any dependent link layer state.
3116 if_freemulti(struct ifmultiaddr *ifma)
3119 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti: refcount %d",
3120 ifma->ifma_refcount));
3121 KASSERT(ifma->ifma_protospec == NULL,
3122 ("if_freemulti: protospec not NULL"));
3124 if (ifma->ifma_lladdr != NULL)
3125 free(ifma->ifma_lladdr, M_IFMADDR);
3126 free(ifma->ifma_addr, M_IFMADDR);
3127 free(ifma, M_IFMADDR);
3131 * Register an additional multicast address with a network interface.
3133 * - If the address is already present, bump the reference count on the
3134 * address and return.
3135 * - If the address is not link-layer, look up a link layer address.
3136 * - Allocate address structures for one or both addresses, and attach to the
3137 * multicast address list on the interface. If automatically adding a link
3138 * layer address, the protocol address will own a reference to the link
3139 * layer address, to be freed when it is freed.
3140 * - Notify the network device driver of an addition to the multicast address
3143 * 'sa' points to caller-owned memory with the desired multicast address.
3145 * 'retifma' will be used to return a pointer to the resulting multicast
3146 * address reference, if desired.
3149 if_addmulti(struct ifnet *ifp, struct sockaddr *sa,
3150 struct ifmultiaddr **retifma)
3152 struct ifmultiaddr *ifma, *ll_ifma;
3153 struct sockaddr *llsa;
3157 * If the address is already present, return a new reference to it;
3158 * otherwise, allocate storage and set up a new address.
3161 ifma = if_findmulti(ifp, sa);
3163 ifma->ifma_refcount++;
3164 if (retifma != NULL)
3166 IF_ADDR_WUNLOCK(ifp);
3171 * The address isn't already present; resolve the protocol address
3172 * into a link layer address, and then look that up, bump its
3173 * refcount or allocate an ifma for that also. If 'llsa' was
3174 * returned, we will need to free it later.
3178 if (ifp->if_resolvemulti != NULL) {
3179 error = ifp->if_resolvemulti(ifp, &llsa, sa);
3185 * Allocate the new address. Don't hook it up yet, as we may also
3186 * need to allocate a link layer multicast address.
3188 ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT);
3195 * If a link layer address is found, we'll need to see if it's
3196 * already present in the address list, or allocate is as well.
3197 * When this block finishes, the link layer address will be on the
3201 ll_ifma = if_findmulti(ifp, llsa);
3202 if (ll_ifma == NULL) {
3203 ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT);
3204 if (ll_ifma == NULL) {
3205 --ifma->ifma_refcount;
3210 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma,
3213 ll_ifma->ifma_refcount++;
3214 ifma->ifma_llifma = ll_ifma;
3218 * We now have a new multicast address, ifma, and possibly a new or
3219 * referenced link layer address. Add the primary address to the
3220 * ifnet address list.
3222 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link);
3224 if (retifma != NULL)
3228 * Must generate the message while holding the lock so that 'ifma'
3229 * pointer is still valid.
3231 rt_newmaddrmsg(RTM_NEWMADDR, ifma);
3232 IF_ADDR_WUNLOCK(ifp);
3235 * We are certain we have added something, so call down to the
3236 * interface to let them know about it.
3238 if (ifp->if_ioctl != NULL) {
3239 (void) (*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0);
3243 free(llsa, M_IFMADDR);
3249 free(llsa, M_IFMADDR);
3252 IF_ADDR_WUNLOCK(ifp);
3257 * Delete a multicast group membership by network-layer group address.
3259 * Returns ENOENT if the entry could not be found. If ifp no longer
3260 * exists, results are undefined. This entry point should only be used
3261 * from subsystems which do appropriate locking to hold ifp for the
3262 * duration of the call.
3263 * Network-layer protocol domains must use if_delmulti_ifma().
3266 if_delmulti(struct ifnet *ifp, struct sockaddr *sa)
3268 struct ifmultiaddr *ifma;
3273 IFNET_RLOCK_NOSLEEP();
3274 TAILQ_FOREACH(oifp, &V_ifnet, if_link)
3279 IFNET_RUNLOCK_NOSLEEP();
3281 KASSERT(ifp != NULL, ("%s: ifnet went away", __func__));
3288 ifma = if_findmulti(ifp, sa);
3290 lastref = if_delmulti_locked(ifp, ifma, 0);
3291 IF_ADDR_WUNLOCK(ifp);
3296 if (lastref && ifp->if_ioctl != NULL) {
3297 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0);
3304 * Delete all multicast group membership for an interface.
3305 * Should be used to quickly flush all multicast filters.
3308 if_delallmulti(struct ifnet *ifp)
3310 struct ifmultiaddr *ifma;
3311 struct ifmultiaddr *next;
3314 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next)
3315 if_delmulti_locked(ifp, ifma, 0);
3316 IF_ADDR_WUNLOCK(ifp);
3320 * Delete a multicast group membership by group membership pointer.
3321 * Network-layer protocol domains must use this routine.
3323 * It is safe to call this routine if the ifp disappeared.
3326 if_delmulti_ifma(struct ifmultiaddr *ifma)
3331 ifp = ifma->ifma_ifp;
3334 printf("%s: ifma_ifp seems to be detached\n", __func__);
3338 IFNET_RLOCK_NOSLEEP();
3339 TAILQ_FOREACH(oifp, &V_ifnet, if_link)
3343 printf("%s: ifnet %p disappeared\n", __func__, ifp);
3346 IFNET_RUNLOCK_NOSLEEP();
3350 * If and only if the ifnet instance exists: Acquire the address lock.
3355 lastref = if_delmulti_locked(ifp, ifma, 0);
3359 * If and only if the ifnet instance exists:
3360 * Release the address lock.
3361 * If the group was left: update the hardware hash filter.
3363 IF_ADDR_WUNLOCK(ifp);
3364 if (lastref && ifp->if_ioctl != NULL) {
3365 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0);
3371 * Perform deletion of network-layer and/or link-layer multicast address.
3373 * Return 0 if the reference count was decremented.
3374 * Return 1 if the final reference was released, indicating that the
3375 * hardware hash filter should be reprogrammed.
3378 if_delmulti_locked(struct ifnet *ifp, struct ifmultiaddr *ifma, int detaching)
3380 struct ifmultiaddr *ll_ifma;
3382 if (ifp != NULL && ifma->ifma_ifp != NULL) {
3383 KASSERT(ifma->ifma_ifp == ifp,
3384 ("%s: inconsistent ifp %p", __func__, ifp));
3385 IF_ADDR_WLOCK_ASSERT(ifp);
3388 ifp = ifma->ifma_ifp;
3391 * If the ifnet is detaching, null out references to ifnet,
3392 * so that upper protocol layers will notice, and not attempt
3393 * to obtain locks for an ifnet which no longer exists. The
3394 * routing socket announcement must happen before the ifnet
3395 * instance is detached from the system.
3399 printf("%s: detaching ifnet instance %p\n", __func__, ifp);
3402 * ifp may already be nulled out if we are being reentered
3403 * to delete the ll_ifma.
3406 rt_newmaddrmsg(RTM_DELMADDR, ifma);
3407 ifma->ifma_ifp = NULL;
3411 if (--ifma->ifma_refcount > 0)
3415 * If this ifma is a network-layer ifma, a link-layer ifma may
3416 * have been associated with it. Release it first if so.
3418 ll_ifma = ifma->ifma_llifma;
3419 if (ll_ifma != NULL) {
3420 KASSERT(ifma->ifma_lladdr != NULL,
3421 ("%s: llifma w/o lladdr", __func__));
3423 ll_ifma->ifma_ifp = NULL; /* XXX */
3424 if (--ll_ifma->ifma_refcount == 0) {
3426 TAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma,
3429 if_freemulti(ll_ifma);
3434 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link);
3439 * The last reference to this instance of struct ifmultiaddr
3440 * was released; the hardware should be notified of this change.
3446 * Set the link layer address on an interface.
3448 * At this time we only support certain types of interfaces,
3449 * and we don't allow the length of the address to change.
3452 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len)
3454 struct sockaddr_dl *sdl;
3461 IF_ADDR_RUNLOCK(ifp);
3465 IF_ADDR_RUNLOCK(ifp);
3466 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
3471 if (len != sdl->sdl_alen) { /* don't allow length to change */
3475 switch (ifp->if_type) {
3483 case IFT_IEEE8023ADLAG:
3485 bcopy(lladdr, LLADDR(sdl), len);
3494 * If the interface is already up, we need
3495 * to re-init it in order to reprogram its
3498 if ((ifp->if_flags & IFF_UP) != 0) {
3499 if (ifp->if_ioctl) {
3500 ifp->if_flags &= ~IFF_UP;
3501 ifr.ifr_flags = ifp->if_flags & 0xffff;
3502 ifr.ifr_flagshigh = ifp->if_flags >> 16;
3503 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
3504 ifp->if_flags |= IFF_UP;
3505 ifr.ifr_flags = ifp->if_flags & 0xffff;
3506 ifr.ifr_flagshigh = ifp->if_flags >> 16;
3507 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
3511 * Also send gratuitous ARPs to notify other nodes about
3512 * the address change.
3514 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
3515 if (ifa->ifa_addr->sa_family == AF_INET)
3516 arp_ifinit(ifp, ifa);
3524 * The name argument must be a pointer to storage which will last as
3525 * long as the interface does. For physical devices, the result of
3526 * device_get_name(dev) is a good choice and for pseudo-devices a
3527 * static string works well.
3530 if_initname(struct ifnet *ifp, const char *name, int unit)
3532 ifp->if_dname = name;
3533 ifp->if_dunit = unit;
3534 if (unit != IF_DUNIT_NONE)
3535 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit);
3537 strlcpy(ifp->if_xname, name, IFNAMSIZ);
3541 if_printf(struct ifnet *ifp, const char * fmt, ...)
3546 retval = printf("%s: ", ifp->if_xname);
3548 retval += vprintf(fmt, ap);
3554 if_start(struct ifnet *ifp)
3557 (*(ifp)->if_start)(ifp);
3561 * Backwards compatibility interface for drivers
3562 * that have not implemented it
3565 if_transmit(struct ifnet *ifp, struct mbuf *m)
3569 IFQ_HANDOFF(ifp, m, error);
3574 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust)
3579 if (_IF_QFULL(ifq)) {
3586 ifp->if_obytes += m->m_pkthdr.len + adjust;
3587 if (m->m_flags & (M_BCAST|M_MCAST))
3589 active = ifp->if_drv_flags & IFF_DRV_OACTIVE;
3591 _IF_ENQUEUE(ifq, m);
3593 if (ifp != NULL && !active)
3594 (*(ifp)->if_start)(ifp);
3599 if_register_com_alloc(u_char type,
3600 if_com_alloc_t *a, if_com_free_t *f)
3603 KASSERT(if_com_alloc[type] == NULL,
3604 ("if_register_com_alloc: %d already registered", type));
3605 KASSERT(if_com_free[type] == NULL,
3606 ("if_register_com_alloc: %d free already registered", type));
3608 if_com_alloc[type] = a;
3609 if_com_free[type] = f;
3613 if_deregister_com_alloc(u_char type)
3616 KASSERT(if_com_alloc[type] != NULL,
3617 ("if_deregister_com_alloc: %d not registered", type));
3618 KASSERT(if_com_free[type] != NULL,
3619 ("if_deregister_com_alloc: %d free not registered", type));
3620 if_com_alloc[type] = NULL;
3621 if_com_free[type] = NULL;